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1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41#define pr_fmt(fmt) "IPv6: " fmt
42
43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/kernel.h>
46#include <linux/socket.h>
47#include <linux/sockios.h>
48#include <linux/net.h>
49#include <linux/inet.h>
50#include <linux/in6.h>
51#include <linux/netdevice.h>
52#include <linux/if_addr.h>
53#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
59#include <linux/slab.h>
60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
63#include <linux/capability.h>
64#include <linux/delay.h>
65#include <linux/notifier.h>
66#include <linux/string.h>
67#include <linux/hash.h>
68
69#include <net/net_namespace.h>
70#include <net/sock.h>
71#include <net/snmp.h>
72
73#include <net/6lowpan.h>
74#include <net/firewire.h>
75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
82#include <net/netlink.h>
83#include <net/pkt_sched.h>
84#include <net/l3mdev.h>
85#include <linux/if_tunnel.h>
86#include <linux/rtnetlink.h>
87#include <linux/netconf.h>
88#include <linux/random.h>
89#include <linux/uaccess.h>
90#include <asm/unaligned.h>
91
92#include <linux/proc_fs.h>
93#include <linux/seq_file.h>
94#include <linux/export.h>
95
96/* Set to 3 to get tracing... */
97#define ACONF_DEBUG 2
98
99#if ACONF_DEBUG >= 3
100#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
101#else
102#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
103#endif
104
105#define INFINITY_LIFE_TIME 0xFFFFFFFF
106
107#define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
110static inline u32 cstamp_delta(unsigned long cstamp)
111{
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113}
114
115#ifdef CONFIG_SYSCTL
116static int addrconf_sysctl_register(struct inet6_dev *idev);
117static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118#else
119static inline int addrconf_sysctl_register(struct inet6_dev *idev)
120{
121 return 0;
122}
123
124static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125{
126}
127#endif
128
129static void __ipv6_regen_rndid(struct inet6_dev *idev);
130static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
131static void ipv6_regen_rndid(unsigned long data);
132
133static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134static int ipv6_count_addresses(struct inet6_dev *idev);
135static int ipv6_generate_stable_address(struct in6_addr *addr,
136 u8 dad_count,
137 const struct inet6_dev *idev);
138
139/*
140 * Configured unicast address hash table
141 */
142static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
143static DEFINE_SPINLOCK(addrconf_hash_lock);
144
145static void addrconf_verify(void);
146static void addrconf_verify_rtnl(void);
147static void addrconf_verify_work(struct work_struct *);
148
149static struct workqueue_struct *addrconf_wq;
150static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
151
152static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154
155static void addrconf_type_change(struct net_device *dev,
156 unsigned long event);
157static int addrconf_ifdown(struct net_device *dev, int how);
158
159static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160 int plen,
161 const struct net_device *dev,
162 u32 flags, u32 noflags);
163
164static void addrconf_dad_start(struct inet6_ifaddr *ifp);
165static void addrconf_dad_work(struct work_struct *w);
166static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
167static void addrconf_dad_run(struct inet6_dev *idev);
168static void addrconf_rs_timer(unsigned long data);
169static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171
172static void inet6_prefix_notify(int event, struct inet6_dev *idev,
173 struct prefix_info *pinfo);
174static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175 struct net_device *dev);
176
177static struct ipv6_devconf ipv6_devconf __read_mostly = {
178 .forwarding = 0,
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
181 .accept_ra = 1,
182 .accept_redirects = 1,
183 .autoconf = 1,
184 .force_mld_version = 0,
185 .mldv1_unsolicited_report_interval = 10 * HZ,
186 .mldv2_unsolicited_report_interval = HZ,
187 .dad_transmits = 1,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
191 .use_tempaddr = 0,
192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
196 .max_addresses = IPV6_MAX_ADDRESSES,
197 .accept_ra_defrtr = 1,
198 .accept_ra_from_local = 0,
199 .accept_ra_min_hop_limit= 1,
200 .accept_ra_pinfo = 1,
201#ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
203 .rtr_probe_interval = 60 * HZ,
204#ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
206#endif
207#endif
208 .proxy_ndp = 0,
209 .accept_source_route = 0, /* we do not accept RH0 by default. */
210 .disable_ipv6 = 0,
211 .accept_dad = 1,
212 .suppress_frag_ndisc = 1,
213 .accept_ra_mtu = 1,
214 .stable_secret = {
215 .initialized = false,
216 },
217 .use_oif_addrs_only = 0,
218 .ignore_routes_with_linkdown = 0,
219 .keep_addr_on_down = 0,
220};
221
222static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
223 .forwarding = 0,
224 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
225 .mtu6 = IPV6_MIN_MTU,
226 .accept_ra = 1,
227 .accept_redirects = 1,
228 .autoconf = 1,
229 .force_mld_version = 0,
230 .mldv1_unsolicited_report_interval = 10 * HZ,
231 .mldv2_unsolicited_report_interval = HZ,
232 .dad_transmits = 1,
233 .rtr_solicits = MAX_RTR_SOLICITATIONS,
234 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
235 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
236 .use_tempaddr = 0,
237 .temp_valid_lft = TEMP_VALID_LIFETIME,
238 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
239 .regen_max_retry = REGEN_MAX_RETRY,
240 .max_desync_factor = MAX_DESYNC_FACTOR,
241 .max_addresses = IPV6_MAX_ADDRESSES,
242 .accept_ra_defrtr = 1,
243 .accept_ra_from_local = 0,
244 .accept_ra_min_hop_limit= 1,
245 .accept_ra_pinfo = 1,
246#ifdef CONFIG_IPV6_ROUTER_PREF
247 .accept_ra_rtr_pref = 1,
248 .rtr_probe_interval = 60 * HZ,
249#ifdef CONFIG_IPV6_ROUTE_INFO
250 .accept_ra_rt_info_max_plen = 0,
251#endif
252#endif
253 .proxy_ndp = 0,
254 .accept_source_route = 0, /* we do not accept RH0 by default. */
255 .disable_ipv6 = 0,
256 .accept_dad = 1,
257 .suppress_frag_ndisc = 1,
258 .accept_ra_mtu = 1,
259 .stable_secret = {
260 .initialized = false,
261 },
262 .use_oif_addrs_only = 0,
263 .ignore_routes_with_linkdown = 0,
264 .keep_addr_on_down = 0,
265};
266
267/* Check if a valid qdisc is available */
268static inline bool addrconf_qdisc_ok(const struct net_device *dev)
269{
270 return !qdisc_tx_is_noop(dev);
271}
272
273static void addrconf_del_rs_timer(struct inet6_dev *idev)
274{
275 if (del_timer(&idev->rs_timer))
276 __in6_dev_put(idev);
277}
278
279static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
280{
281 if (cancel_delayed_work(&ifp->dad_work))
282 __in6_ifa_put(ifp);
283}
284
285static void addrconf_mod_rs_timer(struct inet6_dev *idev,
286 unsigned long when)
287{
288 if (!timer_pending(&idev->rs_timer))
289 in6_dev_hold(idev);
290 mod_timer(&idev->rs_timer, jiffies + when);
291}
292
293static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
294 unsigned long delay)
295{
296 if (!delayed_work_pending(&ifp->dad_work))
297 in6_ifa_hold(ifp);
298 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
299}
300
301static int snmp6_alloc_dev(struct inet6_dev *idev)
302{
303 int i;
304
305 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
306 if (!idev->stats.ipv6)
307 goto err_ip;
308
309 for_each_possible_cpu(i) {
310 struct ipstats_mib *addrconf_stats;
311 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
312 u64_stats_init(&addrconf_stats->syncp);
313 }
314
315
316 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
317 GFP_KERNEL);
318 if (!idev->stats.icmpv6dev)
319 goto err_icmp;
320 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
321 GFP_KERNEL);
322 if (!idev->stats.icmpv6msgdev)
323 goto err_icmpmsg;
324
325 return 0;
326
327err_icmpmsg:
328 kfree(idev->stats.icmpv6dev);
329err_icmp:
330 free_percpu(idev->stats.ipv6);
331err_ip:
332 return -ENOMEM;
333}
334
335static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
336{
337 struct inet6_dev *ndev;
338 int err = -ENOMEM;
339
340 ASSERT_RTNL();
341
342 if (dev->mtu < IPV6_MIN_MTU)
343 return ERR_PTR(-EINVAL);
344
345 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
346 if (!ndev)
347 return ERR_PTR(err);
348
349 rwlock_init(&ndev->lock);
350 ndev->dev = dev;
351 INIT_LIST_HEAD(&ndev->addr_list);
352 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
353 (unsigned long)ndev);
354 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
355
356 if (ndev->cnf.stable_secret.initialized)
357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
358 else
359 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
360
361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (!ndev->nd_parms) {
365 kfree(ndev);
366 return ERR_PTR(err);
367 }
368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
370 /* We refer to the device */
371 dev_hold(dev);
372
373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG(KERN_WARNING
375 "%s: cannot allocate memory for statistics; dev=%s.\n",
376 __func__, dev->name);
377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 dev_put(dev);
379 kfree(ndev);
380 return ERR_PTR(err);
381 }
382
383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG(KERN_WARNING
385 "%s: cannot create /proc/net/dev_snmp6/%s\n",
386 __func__, dev->name);
387 goto err_release;
388 }
389
390 /* One reference from device. We must do this before
391 * we invoke __ipv6_regen_rndid().
392 */
393 in6_dev_hold(ndev);
394
395 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
396 ndev->cnf.accept_dad = -1;
397
398#if IS_ENABLED(CONFIG_IPV6_SIT)
399 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
400 pr_info("%s: Disabled Multicast RS\n", dev->name);
401 ndev->cnf.rtr_solicits = 0;
402 }
403#endif
404
405 INIT_LIST_HEAD(&ndev->tempaddr_list);
406 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
407 if ((dev->flags&IFF_LOOPBACK) ||
408 dev->type == ARPHRD_TUNNEL ||
409 dev->type == ARPHRD_TUNNEL6 ||
410 dev->type == ARPHRD_SIT ||
411 dev->type == ARPHRD_NONE) {
412 ndev->cnf.use_tempaddr = -1;
413 } else {
414 in6_dev_hold(ndev);
415 ipv6_regen_rndid((unsigned long) ndev);
416 }
417
418 ndev->token = in6addr_any;
419
420 if (netif_running(dev) && addrconf_qdisc_ok(dev))
421 ndev->if_flags |= IF_READY;
422
423 ipv6_mc_init_dev(ndev);
424 ndev->tstamp = jiffies;
425 err = addrconf_sysctl_register(ndev);
426 if (err) {
427 ipv6_mc_destroy_dev(ndev);
428 del_timer(&ndev->regen_timer);
429 snmp6_unregister_dev(ndev);
430 goto err_release;
431 }
432 /* protected by rtnl_lock */
433 rcu_assign_pointer(dev->ip6_ptr, ndev);
434
435 /* Join interface-local all-node multicast group */
436 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
437
438 /* Join all-node multicast group */
439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
440
441 /* Join all-router multicast group if forwarding is set */
442 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
443 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
444
445 return ndev;
446
447err_release:
448 neigh_parms_release(&nd_tbl, ndev->nd_parms);
449 ndev->dead = 1;
450 in6_dev_finish_destroy(ndev);
451 return ERR_PTR(err);
452}
453
454static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
455{
456 struct inet6_dev *idev;
457
458 ASSERT_RTNL();
459
460 idev = __in6_dev_get(dev);
461 if (!idev) {
462 idev = ipv6_add_dev(dev);
463 if (IS_ERR(idev))
464 return NULL;
465 }
466
467 if (dev->flags&IFF_UP)
468 ipv6_mc_up(idev);
469 return idev;
470}
471
472static int inet6_netconf_msgsize_devconf(int type)
473{
474 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
475 + nla_total_size(4); /* NETCONFA_IFINDEX */
476 bool all = false;
477
478 if (type == NETCONFA_ALL)
479 all = true;
480
481 if (all || type == NETCONFA_FORWARDING)
482 size += nla_total_size(4);
483#ifdef CONFIG_IPV6_MROUTE
484 if (all || type == NETCONFA_MC_FORWARDING)
485 size += nla_total_size(4);
486#endif
487 if (all || type == NETCONFA_PROXY_NEIGH)
488 size += nla_total_size(4);
489
490 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
491 size += nla_total_size(4);
492
493 return size;
494}
495
496static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
497 struct ipv6_devconf *devconf, u32 portid,
498 u32 seq, int event, unsigned int flags,
499 int type)
500{
501 struct nlmsghdr *nlh;
502 struct netconfmsg *ncm;
503 bool all = false;
504
505 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
506 flags);
507 if (!nlh)
508 return -EMSGSIZE;
509
510 if (type == NETCONFA_ALL)
511 all = true;
512
513 ncm = nlmsg_data(nlh);
514 ncm->ncm_family = AF_INET6;
515
516 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
517 goto nla_put_failure;
518
519 if ((all || type == NETCONFA_FORWARDING) &&
520 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
521 goto nla_put_failure;
522#ifdef CONFIG_IPV6_MROUTE
523 if ((all || type == NETCONFA_MC_FORWARDING) &&
524 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
525 devconf->mc_forwarding) < 0)
526 goto nla_put_failure;
527#endif
528 if ((all || type == NETCONFA_PROXY_NEIGH) &&
529 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
530 goto nla_put_failure;
531
532 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
533 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
534 devconf->ignore_routes_with_linkdown) < 0)
535 goto nla_put_failure;
536
537 nlmsg_end(skb, nlh);
538 return 0;
539
540nla_put_failure:
541 nlmsg_cancel(skb, nlh);
542 return -EMSGSIZE;
543}
544
545void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
546 struct ipv6_devconf *devconf)
547{
548 struct sk_buff *skb;
549 int err = -ENOBUFS;
550
551 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
552 if (!skb)
553 goto errout;
554
555 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
556 RTM_NEWNETCONF, 0, type);
557 if (err < 0) {
558 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
559 WARN_ON(err == -EMSGSIZE);
560 kfree_skb(skb);
561 goto errout;
562 }
563 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
564 return;
565errout:
566 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
567}
568
569static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
570 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
571 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
572 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
573 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
574};
575
576static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
577 struct nlmsghdr *nlh)
578{
579 struct net *net = sock_net(in_skb->sk);
580 struct nlattr *tb[NETCONFA_MAX+1];
581 struct netconfmsg *ncm;
582 struct sk_buff *skb;
583 struct ipv6_devconf *devconf;
584 struct inet6_dev *in6_dev;
585 struct net_device *dev;
586 int ifindex;
587 int err;
588
589 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
590 devconf_ipv6_policy);
591 if (err < 0)
592 goto errout;
593
594 err = -EINVAL;
595 if (!tb[NETCONFA_IFINDEX])
596 goto errout;
597
598 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
599 switch (ifindex) {
600 case NETCONFA_IFINDEX_ALL:
601 devconf = net->ipv6.devconf_all;
602 break;
603 case NETCONFA_IFINDEX_DEFAULT:
604 devconf = net->ipv6.devconf_dflt;
605 break;
606 default:
607 dev = __dev_get_by_index(net, ifindex);
608 if (!dev)
609 goto errout;
610 in6_dev = __in6_dev_get(dev);
611 if (!in6_dev)
612 goto errout;
613 devconf = &in6_dev->cnf;
614 break;
615 }
616
617 err = -ENOBUFS;
618 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
619 if (!skb)
620 goto errout;
621
622 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
623 NETLINK_CB(in_skb).portid,
624 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
625 NETCONFA_ALL);
626 if (err < 0) {
627 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
628 WARN_ON(err == -EMSGSIZE);
629 kfree_skb(skb);
630 goto errout;
631 }
632 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
633errout:
634 return err;
635}
636
637static int inet6_netconf_dump_devconf(struct sk_buff *skb,
638 struct netlink_callback *cb)
639{
640 struct net *net = sock_net(skb->sk);
641 int h, s_h;
642 int idx, s_idx;
643 struct net_device *dev;
644 struct inet6_dev *idev;
645 struct hlist_head *head;
646
647 s_h = cb->args[0];
648 s_idx = idx = cb->args[1];
649
650 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
651 idx = 0;
652 head = &net->dev_index_head[h];
653 rcu_read_lock();
654 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
655 net->dev_base_seq;
656 hlist_for_each_entry_rcu(dev, head, index_hlist) {
657 if (idx < s_idx)
658 goto cont;
659 idev = __in6_dev_get(dev);
660 if (!idev)
661 goto cont;
662
663 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
664 &idev->cnf,
665 NETLINK_CB(cb->skb).portid,
666 cb->nlh->nlmsg_seq,
667 RTM_NEWNETCONF,
668 NLM_F_MULTI,
669 NETCONFA_ALL) < 0) {
670 rcu_read_unlock();
671 goto done;
672 }
673 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
674cont:
675 idx++;
676 }
677 rcu_read_unlock();
678 }
679 if (h == NETDEV_HASHENTRIES) {
680 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
681 net->ipv6.devconf_all,
682 NETLINK_CB(cb->skb).portid,
683 cb->nlh->nlmsg_seq,
684 RTM_NEWNETCONF, NLM_F_MULTI,
685 NETCONFA_ALL) < 0)
686 goto done;
687 else
688 h++;
689 }
690 if (h == NETDEV_HASHENTRIES + 1) {
691 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
692 net->ipv6.devconf_dflt,
693 NETLINK_CB(cb->skb).portid,
694 cb->nlh->nlmsg_seq,
695 RTM_NEWNETCONF, NLM_F_MULTI,
696 NETCONFA_ALL) < 0)
697 goto done;
698 else
699 h++;
700 }
701done:
702 cb->args[0] = h;
703 cb->args[1] = idx;
704
705 return skb->len;
706}
707
708#ifdef CONFIG_SYSCTL
709static void dev_forward_change(struct inet6_dev *idev)
710{
711 struct net_device *dev;
712 struct inet6_ifaddr *ifa;
713
714 if (!idev)
715 return;
716 dev = idev->dev;
717 if (idev->cnf.forwarding)
718 dev_disable_lro(dev);
719 if (dev->flags & IFF_MULTICAST) {
720 if (idev->cnf.forwarding) {
721 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
722 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
723 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
724 } else {
725 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
726 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
727 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
728 }
729 }
730
731 list_for_each_entry(ifa, &idev->addr_list, if_list) {
732 if (ifa->flags&IFA_F_TENTATIVE)
733 continue;
734 if (idev->cnf.forwarding)
735 addrconf_join_anycast(ifa);
736 else
737 addrconf_leave_anycast(ifa);
738 }
739 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
740 dev->ifindex, &idev->cnf);
741}
742
743
744static void addrconf_forward_change(struct net *net, __s32 newf)
745{
746 struct net_device *dev;
747 struct inet6_dev *idev;
748
749 for_each_netdev(net, dev) {
750 idev = __in6_dev_get(dev);
751 if (idev) {
752 int changed = (!idev->cnf.forwarding) ^ (!newf);
753 idev->cnf.forwarding = newf;
754 if (changed)
755 dev_forward_change(idev);
756 }
757 }
758}
759
760static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
761{
762 struct net *net;
763 int old;
764
765 if (!rtnl_trylock())
766 return restart_syscall();
767
768 net = (struct net *)table->extra2;
769 old = *p;
770 *p = newf;
771
772 if (p == &net->ipv6.devconf_dflt->forwarding) {
773 if ((!newf) ^ (!old))
774 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
775 NETCONFA_IFINDEX_DEFAULT,
776 net->ipv6.devconf_dflt);
777 rtnl_unlock();
778 return 0;
779 }
780
781 if (p == &net->ipv6.devconf_all->forwarding) {
782 net->ipv6.devconf_dflt->forwarding = newf;
783 addrconf_forward_change(net, newf);
784 if ((!newf) ^ (!old))
785 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
786 NETCONFA_IFINDEX_ALL,
787 net->ipv6.devconf_all);
788 } else if ((!newf) ^ (!old))
789 dev_forward_change((struct inet6_dev *)table->extra1);
790 rtnl_unlock();
791
792 if (newf)
793 rt6_purge_dflt_routers(net);
794 return 1;
795}
796
797static void addrconf_linkdown_change(struct net *net, __s32 newf)
798{
799 struct net_device *dev;
800 struct inet6_dev *idev;
801
802 for_each_netdev(net, dev) {
803 idev = __in6_dev_get(dev);
804 if (idev) {
805 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
806
807 idev->cnf.ignore_routes_with_linkdown = newf;
808 if (changed)
809 inet6_netconf_notify_devconf(dev_net(dev),
810 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
811 dev->ifindex,
812 &idev->cnf);
813 }
814 }
815}
816
817static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
818{
819 struct net *net;
820 int old;
821
822 if (!rtnl_trylock())
823 return restart_syscall();
824
825 net = (struct net *)table->extra2;
826 old = *p;
827 *p = newf;
828
829 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
830 if ((!newf) ^ (!old))
831 inet6_netconf_notify_devconf(net,
832 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
833 NETCONFA_IFINDEX_DEFAULT,
834 net->ipv6.devconf_dflt);
835 rtnl_unlock();
836 return 0;
837 }
838
839 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
840 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
841 addrconf_linkdown_change(net, newf);
842 if ((!newf) ^ (!old))
843 inet6_netconf_notify_devconf(net,
844 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
845 NETCONFA_IFINDEX_ALL,
846 net->ipv6.devconf_all);
847 }
848 rtnl_unlock();
849
850 return 1;
851}
852
853#endif
854
855/* Nobody refers to this ifaddr, destroy it */
856void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
857{
858 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
859
860#ifdef NET_REFCNT_DEBUG
861 pr_debug("%s\n", __func__);
862#endif
863
864 in6_dev_put(ifp->idev);
865
866 if (cancel_delayed_work(&ifp->dad_work))
867 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
868 ifp);
869
870 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
871 pr_warn("Freeing alive inet6 address %p\n", ifp);
872 return;
873 }
874 ip6_rt_put(ifp->rt);
875
876 kfree_rcu(ifp, rcu);
877}
878
879static void
880ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
881{
882 struct list_head *p;
883 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
884
885 /*
886 * Each device address list is sorted in order of scope -
887 * global before linklocal.
888 */
889 list_for_each(p, &idev->addr_list) {
890 struct inet6_ifaddr *ifa
891 = list_entry(p, struct inet6_ifaddr, if_list);
892 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
893 break;
894 }
895
896 list_add_tail(&ifp->if_list, p);
897}
898
899static u32 inet6_addr_hash(const struct in6_addr *addr)
900{
901 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
902}
903
904/* On success it returns ifp with increased reference count */
905
906static struct inet6_ifaddr *
907ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
908 const struct in6_addr *peer_addr, int pfxlen,
909 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
910{
911 struct inet6_ifaddr *ifa = NULL;
912 struct rt6_info *rt;
913 unsigned int hash;
914 int err = 0;
915 int addr_type = ipv6_addr_type(addr);
916
917 if (addr_type == IPV6_ADDR_ANY ||
918 addr_type & IPV6_ADDR_MULTICAST ||
919 (!(idev->dev->flags & IFF_LOOPBACK) &&
920 addr_type & IPV6_ADDR_LOOPBACK))
921 return ERR_PTR(-EADDRNOTAVAIL);
922
923 rcu_read_lock_bh();
924 if (idev->dead) {
925 err = -ENODEV; /*XXX*/
926 goto out2;
927 }
928
929 if (idev->cnf.disable_ipv6) {
930 err = -EACCES;
931 goto out2;
932 }
933
934 spin_lock(&addrconf_hash_lock);
935
936 /* Ignore adding duplicate addresses on an interface */
937 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
938 ADBG("ipv6_add_addr: already assigned\n");
939 err = -EEXIST;
940 goto out;
941 }
942
943 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
944
945 if (!ifa) {
946 ADBG("ipv6_add_addr: malloc failed\n");
947 err = -ENOBUFS;
948 goto out;
949 }
950
951 rt = addrconf_dst_alloc(idev, addr, false);
952 if (IS_ERR(rt)) {
953 err = PTR_ERR(rt);
954 goto out;
955 }
956
957 neigh_parms_data_state_setall(idev->nd_parms);
958
959 ifa->addr = *addr;
960 if (peer_addr)
961 ifa->peer_addr = *peer_addr;
962
963 spin_lock_init(&ifa->lock);
964 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
965 INIT_HLIST_NODE(&ifa->addr_lst);
966 ifa->scope = scope;
967 ifa->prefix_len = pfxlen;
968 ifa->flags = flags | IFA_F_TENTATIVE;
969 ifa->valid_lft = valid_lft;
970 ifa->prefered_lft = prefered_lft;
971 ifa->cstamp = ifa->tstamp = jiffies;
972 ifa->tokenized = false;
973
974 ifa->rt = rt;
975
976 ifa->idev = idev;
977 in6_dev_hold(idev);
978 /* For caller */
979 in6_ifa_hold(ifa);
980
981 /* Add to big hash table */
982 hash = inet6_addr_hash(addr);
983
984 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
985 spin_unlock(&addrconf_hash_lock);
986
987 write_lock(&idev->lock);
988 /* Add to inet6_dev unicast addr list. */
989 ipv6_link_dev_addr(idev, ifa);
990
991 if (ifa->flags&IFA_F_TEMPORARY) {
992 list_add(&ifa->tmp_list, &idev->tempaddr_list);
993 in6_ifa_hold(ifa);
994 }
995
996 in6_ifa_hold(ifa);
997 write_unlock(&idev->lock);
998out2:
999 rcu_read_unlock_bh();
1000
1001 if (likely(err == 0))
1002 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1003 else {
1004 kfree(ifa);
1005 ifa = ERR_PTR(err);
1006 }
1007
1008 return ifa;
1009out:
1010 spin_unlock(&addrconf_hash_lock);
1011 goto out2;
1012}
1013
1014enum cleanup_prefix_rt_t {
1015 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1016 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1017 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1018};
1019
1020/*
1021 * Check, whether the prefix for ifp would still need a prefix route
1022 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1023 * constants.
1024 *
1025 * 1) we don't purge prefix if address was not permanent.
1026 * prefix is managed by its own lifetime.
1027 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1028 * 3) if there are no addresses, delete prefix.
1029 * 4) if there are still other permanent address(es),
1030 * corresponding prefix is still permanent.
1031 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1032 * don't purge the prefix, assume user space is managing it.
1033 * 6) otherwise, update prefix lifetime to the
1034 * longest valid lifetime among the corresponding
1035 * addresses on the device.
1036 * Note: subsequent RA will update lifetime.
1037 **/
1038static enum cleanup_prefix_rt_t
1039check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1040{
1041 struct inet6_ifaddr *ifa;
1042 struct inet6_dev *idev = ifp->idev;
1043 unsigned long lifetime;
1044 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1045
1046 *expires = jiffies;
1047
1048 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1049 if (ifa == ifp)
1050 continue;
1051 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1052 ifp->prefix_len))
1053 continue;
1054 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1055 return CLEANUP_PREFIX_RT_NOP;
1056
1057 action = CLEANUP_PREFIX_RT_EXPIRE;
1058
1059 spin_lock(&ifa->lock);
1060
1061 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1062 /*
1063 * Note: Because this address is
1064 * not permanent, lifetime <
1065 * LONG_MAX / HZ here.
1066 */
1067 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1068 *expires = ifa->tstamp + lifetime * HZ;
1069 spin_unlock(&ifa->lock);
1070 }
1071
1072 return action;
1073}
1074
1075static void
1076cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1077{
1078 struct rt6_info *rt;
1079
1080 rt = addrconf_get_prefix_route(&ifp->addr,
1081 ifp->prefix_len,
1082 ifp->idev->dev,
1083 0, RTF_GATEWAY | RTF_DEFAULT);
1084 if (rt) {
1085 if (del_rt)
1086 ip6_del_rt(rt);
1087 else {
1088 if (!(rt->rt6i_flags & RTF_EXPIRES))
1089 rt6_set_expires(rt, expires);
1090 ip6_rt_put(rt);
1091 }
1092 }
1093}
1094
1095
1096/* This function wants to get referenced ifp and releases it before return */
1097
1098static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1099{
1100 int state;
1101 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1102 unsigned long expires;
1103
1104 ASSERT_RTNL();
1105
1106 spin_lock_bh(&ifp->lock);
1107 state = ifp->state;
1108 ifp->state = INET6_IFADDR_STATE_DEAD;
1109 spin_unlock_bh(&ifp->lock);
1110
1111 if (state == INET6_IFADDR_STATE_DEAD)
1112 goto out;
1113
1114 spin_lock_bh(&addrconf_hash_lock);
1115 hlist_del_init_rcu(&ifp->addr_lst);
1116 spin_unlock_bh(&addrconf_hash_lock);
1117
1118 write_lock_bh(&ifp->idev->lock);
1119
1120 if (ifp->flags&IFA_F_TEMPORARY) {
1121 list_del(&ifp->tmp_list);
1122 if (ifp->ifpub) {
1123 in6_ifa_put(ifp->ifpub);
1124 ifp->ifpub = NULL;
1125 }
1126 __in6_ifa_put(ifp);
1127 }
1128
1129 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1130 action = check_cleanup_prefix_route(ifp, &expires);
1131
1132 list_del_init(&ifp->if_list);
1133 __in6_ifa_put(ifp);
1134
1135 write_unlock_bh(&ifp->idev->lock);
1136
1137 addrconf_del_dad_work(ifp);
1138
1139 ipv6_ifa_notify(RTM_DELADDR, ifp);
1140
1141 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1142
1143 if (action != CLEANUP_PREFIX_RT_NOP) {
1144 cleanup_prefix_route(ifp, expires,
1145 action == CLEANUP_PREFIX_RT_DEL);
1146 }
1147
1148 /* clean up prefsrc entries */
1149 rt6_remove_prefsrc(ifp);
1150out:
1151 in6_ifa_put(ifp);
1152}
1153
1154static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1155{
1156 struct inet6_dev *idev = ifp->idev;
1157 struct in6_addr addr, *tmpaddr;
1158 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1159 unsigned long regen_advance;
1160 int tmp_plen;
1161 int ret = 0;
1162 u32 addr_flags;
1163 unsigned long now = jiffies;
1164
1165 write_lock_bh(&idev->lock);
1166 if (ift) {
1167 spin_lock_bh(&ift->lock);
1168 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1169 spin_unlock_bh(&ift->lock);
1170 tmpaddr = &addr;
1171 } else {
1172 tmpaddr = NULL;
1173 }
1174retry:
1175 in6_dev_hold(idev);
1176 if (idev->cnf.use_tempaddr <= 0) {
1177 write_unlock_bh(&idev->lock);
1178 pr_info("%s: use_tempaddr is disabled\n", __func__);
1179 in6_dev_put(idev);
1180 ret = -1;
1181 goto out;
1182 }
1183 spin_lock_bh(&ifp->lock);
1184 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1185 idev->cnf.use_tempaddr = -1; /*XXX*/
1186 spin_unlock_bh(&ifp->lock);
1187 write_unlock_bh(&idev->lock);
1188 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1189 __func__);
1190 in6_dev_put(idev);
1191 ret = -1;
1192 goto out;
1193 }
1194 in6_ifa_hold(ifp);
1195 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1196 __ipv6_try_regen_rndid(idev, tmpaddr);
1197 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1198 age = (now - ifp->tstamp) / HZ;
1199 tmp_valid_lft = min_t(__u32,
1200 ifp->valid_lft,
1201 idev->cnf.temp_valid_lft + age);
1202 tmp_prefered_lft = min_t(__u32,
1203 ifp->prefered_lft,
1204 idev->cnf.temp_prefered_lft + age -
1205 idev->cnf.max_desync_factor);
1206 tmp_plen = ifp->prefix_len;
1207 tmp_tstamp = ifp->tstamp;
1208 spin_unlock_bh(&ifp->lock);
1209
1210 regen_advance = idev->cnf.regen_max_retry *
1211 idev->cnf.dad_transmits *
1212 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1213 write_unlock_bh(&idev->lock);
1214
1215 /* A temporary address is created only if this calculated Preferred
1216 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1217 * an implementation must not create a temporary address with a zero
1218 * Preferred Lifetime.
1219 * Use age calculation as in addrconf_verify to avoid unnecessary
1220 * temporary addresses being generated.
1221 */
1222 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1223 if (tmp_prefered_lft <= regen_advance + age) {
1224 in6_ifa_put(ifp);
1225 in6_dev_put(idev);
1226 ret = -1;
1227 goto out;
1228 }
1229
1230 addr_flags = IFA_F_TEMPORARY;
1231 /* set in addrconf_prefix_rcv() */
1232 if (ifp->flags & IFA_F_OPTIMISTIC)
1233 addr_flags |= IFA_F_OPTIMISTIC;
1234
1235 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1236 ipv6_addr_scope(&addr), addr_flags,
1237 tmp_valid_lft, tmp_prefered_lft);
1238 if (IS_ERR(ift)) {
1239 in6_ifa_put(ifp);
1240 in6_dev_put(idev);
1241 pr_info("%s: retry temporary address regeneration\n", __func__);
1242 tmpaddr = &addr;
1243 write_lock_bh(&idev->lock);
1244 goto retry;
1245 }
1246
1247 spin_lock_bh(&ift->lock);
1248 ift->ifpub = ifp;
1249 ift->cstamp = now;
1250 ift->tstamp = tmp_tstamp;
1251 spin_unlock_bh(&ift->lock);
1252
1253 addrconf_dad_start(ift);
1254 in6_ifa_put(ift);
1255 in6_dev_put(idev);
1256out:
1257 return ret;
1258}
1259
1260/*
1261 * Choose an appropriate source address (RFC3484)
1262 */
1263enum {
1264 IPV6_SADDR_RULE_INIT = 0,
1265 IPV6_SADDR_RULE_LOCAL,
1266 IPV6_SADDR_RULE_SCOPE,
1267 IPV6_SADDR_RULE_PREFERRED,
1268#ifdef CONFIG_IPV6_MIP6
1269 IPV6_SADDR_RULE_HOA,
1270#endif
1271 IPV6_SADDR_RULE_OIF,
1272 IPV6_SADDR_RULE_LABEL,
1273 IPV6_SADDR_RULE_PRIVACY,
1274 IPV6_SADDR_RULE_ORCHID,
1275 IPV6_SADDR_RULE_PREFIX,
1276#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1277 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1278#endif
1279 IPV6_SADDR_RULE_MAX
1280};
1281
1282struct ipv6_saddr_score {
1283 int rule;
1284 int addr_type;
1285 struct inet6_ifaddr *ifa;
1286 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1287 int scopedist;
1288 int matchlen;
1289};
1290
1291struct ipv6_saddr_dst {
1292 const struct in6_addr *addr;
1293 int ifindex;
1294 int scope;
1295 int label;
1296 unsigned int prefs;
1297};
1298
1299static inline int ipv6_saddr_preferred(int type)
1300{
1301 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1302 return 1;
1303 return 0;
1304}
1305
1306static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1307{
1308#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1309 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1310#else
1311 return false;
1312#endif
1313}
1314
1315static int ipv6_get_saddr_eval(struct net *net,
1316 struct ipv6_saddr_score *score,
1317 struct ipv6_saddr_dst *dst,
1318 int i)
1319{
1320 int ret;
1321
1322 if (i <= score->rule) {
1323 switch (i) {
1324 case IPV6_SADDR_RULE_SCOPE:
1325 ret = score->scopedist;
1326 break;
1327 case IPV6_SADDR_RULE_PREFIX:
1328 ret = score->matchlen;
1329 break;
1330 default:
1331 ret = !!test_bit(i, score->scorebits);
1332 }
1333 goto out;
1334 }
1335
1336 switch (i) {
1337 case IPV6_SADDR_RULE_INIT:
1338 /* Rule 0: remember if hiscore is not ready yet */
1339 ret = !!score->ifa;
1340 break;
1341 case IPV6_SADDR_RULE_LOCAL:
1342 /* Rule 1: Prefer same address */
1343 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1344 break;
1345 case IPV6_SADDR_RULE_SCOPE:
1346 /* Rule 2: Prefer appropriate scope
1347 *
1348 * ret
1349 * ^
1350 * -1 | d 15
1351 * ---+--+-+---> scope
1352 * |
1353 * | d is scope of the destination.
1354 * B-d | \
1355 * | \ <- smaller scope is better if
1356 * B-15 | \ if scope is enough for destination.
1357 * | ret = B - scope (-1 <= scope >= d <= 15).
1358 * d-C-1 | /
1359 * |/ <- greater is better
1360 * -C / if scope is not enough for destination.
1361 * /| ret = scope - C (-1 <= d < scope <= 15).
1362 *
1363 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1364 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1365 * Assume B = 0 and we get C > 29.
1366 */
1367 ret = __ipv6_addr_src_scope(score->addr_type);
1368 if (ret >= dst->scope)
1369 ret = -ret;
1370 else
1371 ret -= 128; /* 30 is enough */
1372 score->scopedist = ret;
1373 break;
1374 case IPV6_SADDR_RULE_PREFERRED:
1375 {
1376 /* Rule 3: Avoid deprecated and optimistic addresses */
1377 u8 avoid = IFA_F_DEPRECATED;
1378
1379 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1380 avoid |= IFA_F_OPTIMISTIC;
1381 ret = ipv6_saddr_preferred(score->addr_type) ||
1382 !(score->ifa->flags & avoid);
1383 break;
1384 }
1385#ifdef CONFIG_IPV6_MIP6
1386 case IPV6_SADDR_RULE_HOA:
1387 {
1388 /* Rule 4: Prefer home address */
1389 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1390 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1391 break;
1392 }
1393#endif
1394 case IPV6_SADDR_RULE_OIF:
1395 /* Rule 5: Prefer outgoing interface */
1396 ret = (!dst->ifindex ||
1397 dst->ifindex == score->ifa->idev->dev->ifindex);
1398 break;
1399 case IPV6_SADDR_RULE_LABEL:
1400 /* Rule 6: Prefer matching label */
1401 ret = ipv6_addr_label(net,
1402 &score->ifa->addr, score->addr_type,
1403 score->ifa->idev->dev->ifindex) == dst->label;
1404 break;
1405 case IPV6_SADDR_RULE_PRIVACY:
1406 {
1407 /* Rule 7: Prefer public address
1408 * Note: prefer temporary address if use_tempaddr >= 2
1409 */
1410 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1411 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1412 score->ifa->idev->cnf.use_tempaddr >= 2;
1413 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1414 break;
1415 }
1416 case IPV6_SADDR_RULE_ORCHID:
1417 /* Rule 8-: Prefer ORCHID vs ORCHID or
1418 * non-ORCHID vs non-ORCHID
1419 */
1420 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1421 ipv6_addr_orchid(dst->addr));
1422 break;
1423 case IPV6_SADDR_RULE_PREFIX:
1424 /* Rule 8: Use longest matching prefix */
1425 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1426 if (ret > score->ifa->prefix_len)
1427 ret = score->ifa->prefix_len;
1428 score->matchlen = ret;
1429 break;
1430#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1431 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1432 /* Optimistic addresses still have lower precedence than other
1433 * preferred addresses.
1434 */
1435 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1436 break;
1437#endif
1438 default:
1439 ret = 0;
1440 }
1441
1442 if (ret)
1443 __set_bit(i, score->scorebits);
1444 score->rule = i;
1445out:
1446 return ret;
1447}
1448
1449static int __ipv6_dev_get_saddr(struct net *net,
1450 struct ipv6_saddr_dst *dst,
1451 struct inet6_dev *idev,
1452 struct ipv6_saddr_score *scores,
1453 int hiscore_idx)
1454{
1455 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1456
1457 read_lock_bh(&idev->lock);
1458 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1459 int i;
1460
1461 /*
1462 * - Tentative Address (RFC2462 section 5.4)
1463 * - A tentative address is not considered
1464 * "assigned to an interface" in the traditional
1465 * sense, unless it is also flagged as optimistic.
1466 * - Candidate Source Address (section 4)
1467 * - In any case, anycast addresses, multicast
1468 * addresses, and the unspecified address MUST
1469 * NOT be included in a candidate set.
1470 */
1471 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1472 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1473 continue;
1474
1475 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1476
1477 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1478 score->addr_type & IPV6_ADDR_MULTICAST)) {
1479 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1480 idev->dev->name);
1481 continue;
1482 }
1483
1484 score->rule = -1;
1485 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1486
1487 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1488 int minihiscore, miniscore;
1489
1490 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1491 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1492
1493 if (minihiscore > miniscore) {
1494 if (i == IPV6_SADDR_RULE_SCOPE &&
1495 score->scopedist > 0) {
1496 /*
1497 * special case:
1498 * each remaining entry
1499 * has too small (not enough)
1500 * scope, because ifa entries
1501 * are sorted by their scope
1502 * values.
1503 */
1504 goto out;
1505 }
1506 break;
1507 } else if (minihiscore < miniscore) {
1508 if (hiscore->ifa)
1509 in6_ifa_put(hiscore->ifa);
1510
1511 in6_ifa_hold(score->ifa);
1512
1513 swap(hiscore, score);
1514 hiscore_idx = 1 - hiscore_idx;
1515
1516 /* restore our iterator */
1517 score->ifa = hiscore->ifa;
1518
1519 break;
1520 }
1521 }
1522 }
1523out:
1524 read_unlock_bh(&idev->lock);
1525 return hiscore_idx;
1526}
1527
1528int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1529 const struct in6_addr *daddr, unsigned int prefs,
1530 struct in6_addr *saddr)
1531{
1532 struct ipv6_saddr_score scores[2], *hiscore;
1533 struct ipv6_saddr_dst dst;
1534 struct inet6_dev *idev;
1535 struct net_device *dev;
1536 int dst_type;
1537 bool use_oif_addr = false;
1538 int hiscore_idx = 0;
1539
1540 dst_type = __ipv6_addr_type(daddr);
1541 dst.addr = daddr;
1542 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1543 dst.scope = __ipv6_addr_src_scope(dst_type);
1544 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1545 dst.prefs = prefs;
1546
1547 scores[hiscore_idx].rule = -1;
1548 scores[hiscore_idx].ifa = NULL;
1549
1550 rcu_read_lock();
1551
1552 /* Candidate Source Address (section 4)
1553 * - multicast and link-local destination address,
1554 * the set of candidate source address MUST only
1555 * include addresses assigned to interfaces
1556 * belonging to the same link as the outgoing
1557 * interface.
1558 * (- For site-local destination addresses, the
1559 * set of candidate source addresses MUST only
1560 * include addresses assigned to interfaces
1561 * belonging to the same site as the outgoing
1562 * interface.)
1563 * - "It is RECOMMENDED that the candidate source addresses
1564 * be the set of unicast addresses assigned to the
1565 * interface that will be used to send to the destination
1566 * (the 'outgoing' interface)." (RFC 6724)
1567 */
1568 if (dst_dev) {
1569 idev = __in6_dev_get(dst_dev);
1570 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1571 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1572 (idev && idev->cnf.use_oif_addrs_only)) {
1573 use_oif_addr = true;
1574 }
1575 }
1576
1577 if (use_oif_addr) {
1578 if (idev)
1579 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1580 } else {
1581 for_each_netdev_rcu(net, dev) {
1582 idev = __in6_dev_get(dev);
1583 if (!idev)
1584 continue;
1585 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1586 }
1587 }
1588 rcu_read_unlock();
1589
1590 hiscore = &scores[hiscore_idx];
1591 if (!hiscore->ifa)
1592 return -EADDRNOTAVAIL;
1593
1594 *saddr = hiscore->ifa->addr;
1595 in6_ifa_put(hiscore->ifa);
1596 return 0;
1597}
1598EXPORT_SYMBOL(ipv6_dev_get_saddr);
1599
1600int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1601 u32 banned_flags)
1602{
1603 struct inet6_ifaddr *ifp;
1604 int err = -EADDRNOTAVAIL;
1605
1606 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1607 if (ifp->scope > IFA_LINK)
1608 break;
1609 if (ifp->scope == IFA_LINK &&
1610 !(ifp->flags & banned_flags)) {
1611 *addr = ifp->addr;
1612 err = 0;
1613 break;
1614 }
1615 }
1616 return err;
1617}
1618
1619int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1620 u32 banned_flags)
1621{
1622 struct inet6_dev *idev;
1623 int err = -EADDRNOTAVAIL;
1624
1625 rcu_read_lock();
1626 idev = __in6_dev_get(dev);
1627 if (idev) {
1628 read_lock_bh(&idev->lock);
1629 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1630 read_unlock_bh(&idev->lock);
1631 }
1632 rcu_read_unlock();
1633 return err;
1634}
1635
1636static int ipv6_count_addresses(struct inet6_dev *idev)
1637{
1638 int cnt = 0;
1639 struct inet6_ifaddr *ifp;
1640
1641 read_lock_bh(&idev->lock);
1642 list_for_each_entry(ifp, &idev->addr_list, if_list)
1643 cnt++;
1644 read_unlock_bh(&idev->lock);
1645 return cnt;
1646}
1647
1648int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1649 const struct net_device *dev, int strict)
1650{
1651 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1652}
1653EXPORT_SYMBOL(ipv6_chk_addr);
1654
1655int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1656 const struct net_device *dev, int strict,
1657 u32 banned_flags)
1658{
1659 struct inet6_ifaddr *ifp;
1660 unsigned int hash = inet6_addr_hash(addr);
1661 u32 ifp_flags;
1662
1663 rcu_read_lock_bh();
1664 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1665 if (!net_eq(dev_net(ifp->idev->dev), net))
1666 continue;
1667 /* Decouple optimistic from tentative for evaluation here.
1668 * Ban optimistic addresses explicitly, when required.
1669 */
1670 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1671 ? (ifp->flags&~IFA_F_TENTATIVE)
1672 : ifp->flags;
1673 if (ipv6_addr_equal(&ifp->addr, addr) &&
1674 !(ifp_flags&banned_flags) &&
1675 (!dev || ifp->idev->dev == dev ||
1676 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1677 rcu_read_unlock_bh();
1678 return 1;
1679 }
1680 }
1681
1682 rcu_read_unlock_bh();
1683 return 0;
1684}
1685EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1686
1687static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1688 struct net_device *dev)
1689{
1690 unsigned int hash = inet6_addr_hash(addr);
1691 struct inet6_ifaddr *ifp;
1692
1693 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1694 if (!net_eq(dev_net(ifp->idev->dev), net))
1695 continue;
1696 if (ipv6_addr_equal(&ifp->addr, addr)) {
1697 if (!dev || ifp->idev->dev == dev)
1698 return true;
1699 }
1700 }
1701 return false;
1702}
1703
1704/* Compares an address/prefix_len with addresses on device @dev.
1705 * If one is found it returns true.
1706 */
1707bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1708 const unsigned int prefix_len, struct net_device *dev)
1709{
1710 struct inet6_dev *idev;
1711 struct inet6_ifaddr *ifa;
1712 bool ret = false;
1713
1714 rcu_read_lock();
1715 idev = __in6_dev_get(dev);
1716 if (idev) {
1717 read_lock_bh(&idev->lock);
1718 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1719 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1720 if (ret)
1721 break;
1722 }
1723 read_unlock_bh(&idev->lock);
1724 }
1725 rcu_read_unlock();
1726
1727 return ret;
1728}
1729EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1730
1731int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1732{
1733 struct inet6_dev *idev;
1734 struct inet6_ifaddr *ifa;
1735 int onlink;
1736
1737 onlink = 0;
1738 rcu_read_lock();
1739 idev = __in6_dev_get(dev);
1740 if (idev) {
1741 read_lock_bh(&idev->lock);
1742 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1743 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1744 ifa->prefix_len);
1745 if (onlink)
1746 break;
1747 }
1748 read_unlock_bh(&idev->lock);
1749 }
1750 rcu_read_unlock();
1751 return onlink;
1752}
1753EXPORT_SYMBOL(ipv6_chk_prefix);
1754
1755struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1756 struct net_device *dev, int strict)
1757{
1758 struct inet6_ifaddr *ifp, *result = NULL;
1759 unsigned int hash = inet6_addr_hash(addr);
1760
1761 rcu_read_lock_bh();
1762 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1763 if (!net_eq(dev_net(ifp->idev->dev), net))
1764 continue;
1765 if (ipv6_addr_equal(&ifp->addr, addr)) {
1766 if (!dev || ifp->idev->dev == dev ||
1767 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1768 result = ifp;
1769 in6_ifa_hold(ifp);
1770 break;
1771 }
1772 }
1773 }
1774 rcu_read_unlock_bh();
1775
1776 return result;
1777}
1778
1779/* Gets referenced address, destroys ifaddr */
1780
1781static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1782{
1783 if (dad_failed)
1784 ifp->flags |= IFA_F_DADFAILED;
1785
1786 if (ifp->flags&IFA_F_PERMANENT) {
1787 spin_lock_bh(&ifp->lock);
1788 addrconf_del_dad_work(ifp);
1789 ifp->flags |= IFA_F_TENTATIVE;
1790 spin_unlock_bh(&ifp->lock);
1791 if (dad_failed)
1792 ipv6_ifa_notify(0, ifp);
1793 in6_ifa_put(ifp);
1794 } else if (ifp->flags&IFA_F_TEMPORARY) {
1795 struct inet6_ifaddr *ifpub;
1796 spin_lock_bh(&ifp->lock);
1797 ifpub = ifp->ifpub;
1798 if (ifpub) {
1799 in6_ifa_hold(ifpub);
1800 spin_unlock_bh(&ifp->lock);
1801 ipv6_create_tempaddr(ifpub, ifp);
1802 in6_ifa_put(ifpub);
1803 } else {
1804 spin_unlock_bh(&ifp->lock);
1805 }
1806 ipv6_del_addr(ifp);
1807 } else {
1808 ipv6_del_addr(ifp);
1809 }
1810}
1811
1812static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1813{
1814 int err = -ENOENT;
1815
1816 spin_lock_bh(&ifp->lock);
1817 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1818 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1819 err = 0;
1820 }
1821 spin_unlock_bh(&ifp->lock);
1822
1823 return err;
1824}
1825
1826void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1827{
1828 struct in6_addr addr;
1829 struct inet6_dev *idev = ifp->idev;
1830 struct net *net = dev_net(ifp->idev->dev);
1831
1832 if (addrconf_dad_end(ifp)) {
1833 in6_ifa_put(ifp);
1834 return;
1835 }
1836
1837 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1838 ifp->idev->dev->name, &ifp->addr);
1839
1840 spin_lock_bh(&ifp->lock);
1841
1842 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1843 int scope = ifp->scope;
1844 u32 flags = ifp->flags;
1845 struct in6_addr new_addr;
1846 struct inet6_ifaddr *ifp2;
1847 u32 valid_lft, preferred_lft;
1848 int pfxlen = ifp->prefix_len;
1849 int retries = ifp->stable_privacy_retry + 1;
1850
1851 if (retries > net->ipv6.sysctl.idgen_retries) {
1852 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1853 ifp->idev->dev->name);
1854 goto errdad;
1855 }
1856
1857 new_addr = ifp->addr;
1858 if (ipv6_generate_stable_address(&new_addr, retries,
1859 idev))
1860 goto errdad;
1861
1862 valid_lft = ifp->valid_lft;
1863 preferred_lft = ifp->prefered_lft;
1864
1865 spin_unlock_bh(&ifp->lock);
1866
1867 if (idev->cnf.max_addresses &&
1868 ipv6_count_addresses(idev) >=
1869 idev->cnf.max_addresses)
1870 goto lock_errdad;
1871
1872 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1873 ifp->idev->dev->name);
1874
1875 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1876 scope, flags, valid_lft,
1877 preferred_lft);
1878 if (IS_ERR(ifp2))
1879 goto lock_errdad;
1880
1881 spin_lock_bh(&ifp2->lock);
1882 ifp2->stable_privacy_retry = retries;
1883 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1884 spin_unlock_bh(&ifp2->lock);
1885
1886 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1887 in6_ifa_put(ifp2);
1888lock_errdad:
1889 spin_lock_bh(&ifp->lock);
1890 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1891 addr.s6_addr32[0] = htonl(0xfe800000);
1892 addr.s6_addr32[1] = 0;
1893
1894 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1895 ipv6_addr_equal(&ifp->addr, &addr)) {
1896 /* DAD failed for link-local based on MAC address */
1897 idev->cnf.disable_ipv6 = 1;
1898
1899 pr_info("%s: IPv6 being disabled!\n",
1900 ifp->idev->dev->name);
1901 }
1902 }
1903
1904errdad:
1905 /* transition from _POSTDAD to _ERRDAD */
1906 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1907 spin_unlock_bh(&ifp->lock);
1908
1909 addrconf_mod_dad_work(ifp, 0);
1910}
1911
1912/* Join to solicited addr multicast group.
1913 * caller must hold RTNL */
1914void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1915{
1916 struct in6_addr maddr;
1917
1918 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1919 return;
1920
1921 addrconf_addr_solict_mult(addr, &maddr);
1922 ipv6_dev_mc_inc(dev, &maddr);
1923}
1924
1925/* caller must hold RTNL */
1926void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1927{
1928 struct in6_addr maddr;
1929
1930 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1931 return;
1932
1933 addrconf_addr_solict_mult(addr, &maddr);
1934 __ipv6_dev_mc_dec(idev, &maddr);
1935}
1936
1937/* caller must hold RTNL */
1938static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1939{
1940 struct in6_addr addr;
1941
1942 if (ifp->prefix_len >= 127) /* RFC 6164 */
1943 return;
1944 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1945 if (ipv6_addr_any(&addr))
1946 return;
1947 __ipv6_dev_ac_inc(ifp->idev, &addr);
1948}
1949
1950/* caller must hold RTNL */
1951static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1952{
1953 struct in6_addr addr;
1954
1955 if (ifp->prefix_len >= 127) /* RFC 6164 */
1956 return;
1957 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1958 if (ipv6_addr_any(&addr))
1959 return;
1960 __ipv6_dev_ac_dec(ifp->idev, &addr);
1961}
1962
1963static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1964{
1965 if (dev->addr_len != EUI64_ADDR_LEN)
1966 return -1;
1967 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
1968 eui[0] ^= 2;
1969 return 0;
1970}
1971
1972static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1973{
1974 union fwnet_hwaddr *ha;
1975
1976 if (dev->addr_len != FWNET_ALEN)
1977 return -1;
1978
1979 ha = (union fwnet_hwaddr *)dev->dev_addr;
1980
1981 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1982 eui[0] ^= 2;
1983 return 0;
1984}
1985
1986static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1987{
1988 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1989 if (dev->addr_len != ARCNET_ALEN)
1990 return -1;
1991 memset(eui, 0, 7);
1992 eui[7] = *(u8 *)dev->dev_addr;
1993 return 0;
1994}
1995
1996static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1997{
1998 if (dev->addr_len != INFINIBAND_ALEN)
1999 return -1;
2000 memcpy(eui, dev->dev_addr + 12, 8);
2001 eui[0] |= 2;
2002 return 0;
2003}
2004
2005static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2006{
2007 if (addr == 0)
2008 return -1;
2009 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2010 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2011 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2012 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2013 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2014 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2015 eui[1] = 0;
2016 eui[2] = 0x5E;
2017 eui[3] = 0xFE;
2018 memcpy(eui + 4, &addr, 4);
2019 return 0;
2020}
2021
2022static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2023{
2024 if (dev->priv_flags & IFF_ISATAP)
2025 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2026 return -1;
2027}
2028
2029static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2030{
2031 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2032}
2033
2034static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2035{
2036 memcpy(eui, dev->perm_addr, 3);
2037 memcpy(eui + 5, dev->perm_addr + 3, 3);
2038 eui[3] = 0xFF;
2039 eui[4] = 0xFE;
2040 eui[0] ^= 2;
2041 return 0;
2042}
2043
2044static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2045{
2046 switch (dev->type) {
2047 case ARPHRD_ETHER:
2048 case ARPHRD_FDDI:
2049 return addrconf_ifid_eui48(eui, dev);
2050 case ARPHRD_ARCNET:
2051 return addrconf_ifid_arcnet(eui, dev);
2052 case ARPHRD_INFINIBAND:
2053 return addrconf_ifid_infiniband(eui, dev);
2054 case ARPHRD_SIT:
2055 return addrconf_ifid_sit(eui, dev);
2056 case ARPHRD_IPGRE:
2057 return addrconf_ifid_gre(eui, dev);
2058 case ARPHRD_6LOWPAN:
2059 return addrconf_ifid_eui64(eui, dev);
2060 case ARPHRD_IEEE1394:
2061 return addrconf_ifid_ieee1394(eui, dev);
2062 case ARPHRD_TUNNEL6:
2063 return addrconf_ifid_ip6tnl(eui, dev);
2064 }
2065 return -1;
2066}
2067
2068static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2069{
2070 int err = -1;
2071 struct inet6_ifaddr *ifp;
2072
2073 read_lock_bh(&idev->lock);
2074 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2075 if (ifp->scope > IFA_LINK)
2076 break;
2077 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2078 memcpy(eui, ifp->addr.s6_addr+8, 8);
2079 err = 0;
2080 break;
2081 }
2082 }
2083 read_unlock_bh(&idev->lock);
2084 return err;
2085}
2086
2087/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2088static void __ipv6_regen_rndid(struct inet6_dev *idev)
2089{
2090regen:
2091 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2092 idev->rndid[0] &= ~0x02;
2093
2094 /*
2095 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2096 * check if generated address is not inappropriate
2097 *
2098 * - Reserved subnet anycast (RFC 2526)
2099 * 11111101 11....11 1xxxxxxx
2100 * - ISATAP (RFC4214) 6.1
2101 * 00-00-5E-FE-xx-xx-xx-xx
2102 * - value 0
2103 * - XXX: already assigned to an address on the device
2104 */
2105 if (idev->rndid[0] == 0xfd &&
2106 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2107 (idev->rndid[7]&0x80))
2108 goto regen;
2109 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2110 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2111 goto regen;
2112 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2113 goto regen;
2114 }
2115}
2116
2117static void ipv6_regen_rndid(unsigned long data)
2118{
2119 struct inet6_dev *idev = (struct inet6_dev *) data;
2120 unsigned long expires;
2121
2122 rcu_read_lock_bh();
2123 write_lock_bh(&idev->lock);
2124
2125 if (idev->dead)
2126 goto out;
2127
2128 __ipv6_regen_rndid(idev);
2129
2130 expires = jiffies +
2131 idev->cnf.temp_prefered_lft * HZ -
2132 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2133 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2134 idev->cnf.max_desync_factor * HZ;
2135 if (time_before(expires, jiffies)) {
2136 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2137 __func__, idev->dev->name);
2138 goto out;
2139 }
2140
2141 if (!mod_timer(&idev->regen_timer, expires))
2142 in6_dev_hold(idev);
2143
2144out:
2145 write_unlock_bh(&idev->lock);
2146 rcu_read_unlock_bh();
2147 in6_dev_put(idev);
2148}
2149
2150static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2151{
2152 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2153 __ipv6_regen_rndid(idev);
2154}
2155
2156/*
2157 * Add prefix route.
2158 */
2159
2160static void
2161addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2162 unsigned long expires, u32 flags)
2163{
2164 struct fib6_config cfg = {
2165 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2166 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2167 .fc_ifindex = dev->ifindex,
2168 .fc_expires = expires,
2169 .fc_dst_len = plen,
2170 .fc_flags = RTF_UP | flags,
2171 .fc_nlinfo.nl_net = dev_net(dev),
2172 .fc_protocol = RTPROT_KERNEL,
2173 };
2174
2175 cfg.fc_dst = *pfx;
2176
2177 /* Prevent useless cloning on PtP SIT.
2178 This thing is done here expecting that the whole
2179 class of non-broadcast devices need not cloning.
2180 */
2181#if IS_ENABLED(CONFIG_IPV6_SIT)
2182 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2183 cfg.fc_flags |= RTF_NONEXTHOP;
2184#endif
2185
2186 ip6_route_add(&cfg);
2187}
2188
2189
2190static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2191 int plen,
2192 const struct net_device *dev,
2193 u32 flags, u32 noflags)
2194{
2195 struct fib6_node *fn;
2196 struct rt6_info *rt = NULL;
2197 struct fib6_table *table;
2198 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2199
2200 table = fib6_get_table(dev_net(dev), tb_id);
2201 if (!table)
2202 return NULL;
2203
2204 read_lock_bh(&table->tb6_lock);
2205 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2206 if (!fn)
2207 goto out;
2208
2209 noflags |= RTF_CACHE;
2210 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2211 if (rt->dst.dev->ifindex != dev->ifindex)
2212 continue;
2213 if ((rt->rt6i_flags & flags) != flags)
2214 continue;
2215 if ((rt->rt6i_flags & noflags) != 0)
2216 continue;
2217 dst_hold(&rt->dst);
2218 break;
2219 }
2220out:
2221 read_unlock_bh(&table->tb6_lock);
2222 return rt;
2223}
2224
2225
2226/* Create "default" multicast route to the interface */
2227
2228static void addrconf_add_mroute(struct net_device *dev)
2229{
2230 struct fib6_config cfg = {
2231 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2232 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2233 .fc_ifindex = dev->ifindex,
2234 .fc_dst_len = 8,
2235 .fc_flags = RTF_UP,
2236 .fc_nlinfo.nl_net = dev_net(dev),
2237 };
2238
2239 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2240
2241 ip6_route_add(&cfg);
2242}
2243
2244static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2245{
2246 struct inet6_dev *idev;
2247
2248 ASSERT_RTNL();
2249
2250 idev = ipv6_find_idev(dev);
2251 if (!idev)
2252 return ERR_PTR(-ENOBUFS);
2253
2254 if (idev->cnf.disable_ipv6)
2255 return ERR_PTR(-EACCES);
2256
2257 /* Add default multicast route */
2258 if (!(dev->flags & IFF_LOOPBACK))
2259 addrconf_add_mroute(dev);
2260
2261 return idev;
2262}
2263
2264static void manage_tempaddrs(struct inet6_dev *idev,
2265 struct inet6_ifaddr *ifp,
2266 __u32 valid_lft, __u32 prefered_lft,
2267 bool create, unsigned long now)
2268{
2269 u32 flags;
2270 struct inet6_ifaddr *ift;
2271
2272 read_lock_bh(&idev->lock);
2273 /* update all temporary addresses in the list */
2274 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2275 int age, max_valid, max_prefered;
2276
2277 if (ifp != ift->ifpub)
2278 continue;
2279
2280 /* RFC 4941 section 3.3:
2281 * If a received option will extend the lifetime of a public
2282 * address, the lifetimes of temporary addresses should
2283 * be extended, subject to the overall constraint that no
2284 * temporary addresses should ever remain "valid" or "preferred"
2285 * for a time longer than (TEMP_VALID_LIFETIME) or
2286 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2287 */
2288 age = (now - ift->cstamp) / HZ;
2289 max_valid = idev->cnf.temp_valid_lft - age;
2290 if (max_valid < 0)
2291 max_valid = 0;
2292
2293 max_prefered = idev->cnf.temp_prefered_lft -
2294 idev->cnf.max_desync_factor - age;
2295 if (max_prefered < 0)
2296 max_prefered = 0;
2297
2298 if (valid_lft > max_valid)
2299 valid_lft = max_valid;
2300
2301 if (prefered_lft > max_prefered)
2302 prefered_lft = max_prefered;
2303
2304 spin_lock(&ift->lock);
2305 flags = ift->flags;
2306 ift->valid_lft = valid_lft;
2307 ift->prefered_lft = prefered_lft;
2308 ift->tstamp = now;
2309 if (prefered_lft > 0)
2310 ift->flags &= ~IFA_F_DEPRECATED;
2311
2312 spin_unlock(&ift->lock);
2313 if (!(flags&IFA_F_TENTATIVE))
2314 ipv6_ifa_notify(0, ift);
2315 }
2316
2317 if ((create || list_empty(&idev->tempaddr_list)) &&
2318 idev->cnf.use_tempaddr > 0) {
2319 /* When a new public address is created as described
2320 * in [ADDRCONF], also create a new temporary address.
2321 * Also create a temporary address if it's enabled but
2322 * no temporary address currently exists.
2323 */
2324 read_unlock_bh(&idev->lock);
2325 ipv6_create_tempaddr(ifp, NULL);
2326 } else {
2327 read_unlock_bh(&idev->lock);
2328 }
2329}
2330
2331static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2332{
2333 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2334 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2335}
2336
2337void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2338{
2339 struct prefix_info *pinfo;
2340 __u32 valid_lft;
2341 __u32 prefered_lft;
2342 int addr_type;
2343 u32 addr_flags = 0;
2344 struct inet6_dev *in6_dev;
2345 struct net *net = dev_net(dev);
2346
2347 pinfo = (struct prefix_info *) opt;
2348
2349 if (len < sizeof(struct prefix_info)) {
2350 ADBG("addrconf: prefix option too short\n");
2351 return;
2352 }
2353
2354 /*
2355 * Validation checks ([ADDRCONF], page 19)
2356 */
2357
2358 addr_type = ipv6_addr_type(&pinfo->prefix);
2359
2360 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2361 return;
2362
2363 valid_lft = ntohl(pinfo->valid);
2364 prefered_lft = ntohl(pinfo->prefered);
2365
2366 if (prefered_lft > valid_lft) {
2367 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2368 return;
2369 }
2370
2371 in6_dev = in6_dev_get(dev);
2372
2373 if (!in6_dev) {
2374 net_dbg_ratelimited("addrconf: device %s not configured\n",
2375 dev->name);
2376 return;
2377 }
2378
2379 /*
2380 * Two things going on here:
2381 * 1) Add routes for on-link prefixes
2382 * 2) Configure prefixes with the auto flag set
2383 */
2384
2385 if (pinfo->onlink) {
2386 struct rt6_info *rt;
2387 unsigned long rt_expires;
2388
2389 /* Avoid arithmetic overflow. Really, we could
2390 * save rt_expires in seconds, likely valid_lft,
2391 * but it would require division in fib gc, that it
2392 * not good.
2393 */
2394 if (HZ > USER_HZ)
2395 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2396 else
2397 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2398
2399 if (addrconf_finite_timeout(rt_expires))
2400 rt_expires *= HZ;
2401
2402 rt = addrconf_get_prefix_route(&pinfo->prefix,
2403 pinfo->prefix_len,
2404 dev,
2405 RTF_ADDRCONF | RTF_PREFIX_RT,
2406 RTF_GATEWAY | RTF_DEFAULT);
2407
2408 if (rt) {
2409 /* Autoconf prefix route */
2410 if (valid_lft == 0) {
2411 ip6_del_rt(rt);
2412 rt = NULL;
2413 } else if (addrconf_finite_timeout(rt_expires)) {
2414 /* not infinity */
2415 rt6_set_expires(rt, jiffies + rt_expires);
2416 } else {
2417 rt6_clean_expires(rt);
2418 }
2419 } else if (valid_lft) {
2420 clock_t expires = 0;
2421 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2422 if (addrconf_finite_timeout(rt_expires)) {
2423 /* not infinity */
2424 flags |= RTF_EXPIRES;
2425 expires = jiffies_to_clock_t(rt_expires);
2426 }
2427 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2428 dev, expires, flags);
2429 }
2430 ip6_rt_put(rt);
2431 }
2432
2433 /* Try to figure out our local address for this prefix */
2434
2435 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2436 struct inet6_ifaddr *ifp;
2437 struct in6_addr addr;
2438 int create = 0, update_lft = 0;
2439 bool tokenized = false;
2440
2441 if (pinfo->prefix_len == 64) {
2442 memcpy(&addr, &pinfo->prefix, 8);
2443
2444 if (!ipv6_addr_any(&in6_dev->token)) {
2445 read_lock_bh(&in6_dev->lock);
2446 memcpy(addr.s6_addr + 8,
2447 in6_dev->token.s6_addr + 8, 8);
2448 read_unlock_bh(&in6_dev->lock);
2449 tokenized = true;
2450 } else if (is_addr_mode_generate_stable(in6_dev) &&
2451 !ipv6_generate_stable_address(&addr, 0,
2452 in6_dev)) {
2453 addr_flags |= IFA_F_STABLE_PRIVACY;
2454 goto ok;
2455 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2456 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2457 in6_dev_put(in6_dev);
2458 return;
2459 }
2460 goto ok;
2461 }
2462 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2463 pinfo->prefix_len);
2464 in6_dev_put(in6_dev);
2465 return;
2466
2467ok:
2468
2469 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2470
2471 if (!ifp && valid_lft) {
2472 int max_addresses = in6_dev->cnf.max_addresses;
2473
2474#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2475 if (in6_dev->cnf.optimistic_dad &&
2476 !net->ipv6.devconf_all->forwarding && sllao)
2477 addr_flags |= IFA_F_OPTIMISTIC;
2478#endif
2479
2480 /* Do not allow to create too much of autoconfigured
2481 * addresses; this would be too easy way to crash kernel.
2482 */
2483 if (!max_addresses ||
2484 ipv6_count_addresses(in6_dev) < max_addresses)
2485 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2486 pinfo->prefix_len,
2487 addr_type&IPV6_ADDR_SCOPE_MASK,
2488 addr_flags, valid_lft,
2489 prefered_lft);
2490
2491 if (IS_ERR_OR_NULL(ifp)) {
2492 in6_dev_put(in6_dev);
2493 return;
2494 }
2495
2496 update_lft = 0;
2497 create = 1;
2498 spin_lock_bh(&ifp->lock);
2499 ifp->flags |= IFA_F_MANAGETEMPADDR;
2500 ifp->cstamp = jiffies;
2501 ifp->tokenized = tokenized;
2502 spin_unlock_bh(&ifp->lock);
2503 addrconf_dad_start(ifp);
2504 }
2505
2506 if (ifp) {
2507 u32 flags;
2508 unsigned long now;
2509 u32 stored_lft;
2510
2511 /* update lifetime (RFC2462 5.5.3 e) */
2512 spin_lock_bh(&ifp->lock);
2513 now = jiffies;
2514 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2515 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2516 else
2517 stored_lft = 0;
2518 if (!update_lft && !create && stored_lft) {
2519 const u32 minimum_lft = min_t(u32,
2520 stored_lft, MIN_VALID_LIFETIME);
2521 valid_lft = max(valid_lft, minimum_lft);
2522
2523 /* RFC4862 Section 5.5.3e:
2524 * "Note that the preferred lifetime of the
2525 * corresponding address is always reset to
2526 * the Preferred Lifetime in the received
2527 * Prefix Information option, regardless of
2528 * whether the valid lifetime is also reset or
2529 * ignored."
2530 *
2531 * So we should always update prefered_lft here.
2532 */
2533 update_lft = 1;
2534 }
2535
2536 if (update_lft) {
2537 ifp->valid_lft = valid_lft;
2538 ifp->prefered_lft = prefered_lft;
2539 ifp->tstamp = now;
2540 flags = ifp->flags;
2541 ifp->flags &= ~IFA_F_DEPRECATED;
2542 spin_unlock_bh(&ifp->lock);
2543
2544 if (!(flags&IFA_F_TENTATIVE))
2545 ipv6_ifa_notify(0, ifp);
2546 } else
2547 spin_unlock_bh(&ifp->lock);
2548
2549 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2550 create, now);
2551
2552 in6_ifa_put(ifp);
2553 addrconf_verify();
2554 }
2555 }
2556 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2557 in6_dev_put(in6_dev);
2558}
2559
2560/*
2561 * Set destination address.
2562 * Special case for SIT interfaces where we create a new "virtual"
2563 * device.
2564 */
2565int addrconf_set_dstaddr(struct net *net, void __user *arg)
2566{
2567 struct in6_ifreq ireq;
2568 struct net_device *dev;
2569 int err = -EINVAL;
2570
2571 rtnl_lock();
2572
2573 err = -EFAULT;
2574 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2575 goto err_exit;
2576
2577 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2578
2579 err = -ENODEV;
2580 if (!dev)
2581 goto err_exit;
2582
2583#if IS_ENABLED(CONFIG_IPV6_SIT)
2584 if (dev->type == ARPHRD_SIT) {
2585 const struct net_device_ops *ops = dev->netdev_ops;
2586 struct ifreq ifr;
2587 struct ip_tunnel_parm p;
2588
2589 err = -EADDRNOTAVAIL;
2590 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2591 goto err_exit;
2592
2593 memset(&p, 0, sizeof(p));
2594 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2595 p.iph.saddr = 0;
2596 p.iph.version = 4;
2597 p.iph.ihl = 5;
2598 p.iph.protocol = IPPROTO_IPV6;
2599 p.iph.ttl = 64;
2600 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2601
2602 if (ops->ndo_do_ioctl) {
2603 mm_segment_t oldfs = get_fs();
2604
2605 set_fs(KERNEL_DS);
2606 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2607 set_fs(oldfs);
2608 } else
2609 err = -EOPNOTSUPP;
2610
2611 if (err == 0) {
2612 err = -ENOBUFS;
2613 dev = __dev_get_by_name(net, p.name);
2614 if (!dev)
2615 goto err_exit;
2616 err = dev_open(dev);
2617 }
2618 }
2619#endif
2620
2621err_exit:
2622 rtnl_unlock();
2623 return err;
2624}
2625
2626static int ipv6_mc_config(struct sock *sk, bool join,
2627 const struct in6_addr *addr, int ifindex)
2628{
2629 int ret;
2630
2631 ASSERT_RTNL();
2632
2633 lock_sock(sk);
2634 if (join)
2635 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2636 else
2637 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2638 release_sock(sk);
2639
2640 return ret;
2641}
2642
2643/*
2644 * Manual configuration of address on an interface
2645 */
2646static int inet6_addr_add(struct net *net, int ifindex,
2647 const struct in6_addr *pfx,
2648 const struct in6_addr *peer_pfx,
2649 unsigned int plen, __u32 ifa_flags,
2650 __u32 prefered_lft, __u32 valid_lft)
2651{
2652 struct inet6_ifaddr *ifp;
2653 struct inet6_dev *idev;
2654 struct net_device *dev;
2655 unsigned long timeout;
2656 clock_t expires;
2657 int scope;
2658 u32 flags;
2659
2660 ASSERT_RTNL();
2661
2662 if (plen > 128)
2663 return -EINVAL;
2664
2665 /* check the lifetime */
2666 if (!valid_lft || prefered_lft > valid_lft)
2667 return -EINVAL;
2668
2669 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2670 return -EINVAL;
2671
2672 dev = __dev_get_by_index(net, ifindex);
2673 if (!dev)
2674 return -ENODEV;
2675
2676 idev = addrconf_add_dev(dev);
2677 if (IS_ERR(idev))
2678 return PTR_ERR(idev);
2679
2680 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2681 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2682 true, pfx, ifindex);
2683
2684 if (ret < 0)
2685 return ret;
2686 }
2687
2688 scope = ipv6_addr_scope(pfx);
2689
2690 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2691 if (addrconf_finite_timeout(timeout)) {
2692 expires = jiffies_to_clock_t(timeout * HZ);
2693 valid_lft = timeout;
2694 flags = RTF_EXPIRES;
2695 } else {
2696 expires = 0;
2697 flags = 0;
2698 ifa_flags |= IFA_F_PERMANENT;
2699 }
2700
2701 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2702 if (addrconf_finite_timeout(timeout)) {
2703 if (timeout == 0)
2704 ifa_flags |= IFA_F_DEPRECATED;
2705 prefered_lft = timeout;
2706 }
2707
2708 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2709 valid_lft, prefered_lft);
2710
2711 if (!IS_ERR(ifp)) {
2712 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2713 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2714 expires, flags);
2715 }
2716
2717 /*
2718 * Note that section 3.1 of RFC 4429 indicates
2719 * that the Optimistic flag should not be set for
2720 * manually configured addresses
2721 */
2722 addrconf_dad_start(ifp);
2723 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2724 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2725 true, jiffies);
2726 in6_ifa_put(ifp);
2727 addrconf_verify_rtnl();
2728 return 0;
2729 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2730 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2731 false, pfx, ifindex);
2732 }
2733
2734 return PTR_ERR(ifp);
2735}
2736
2737static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2738 const struct in6_addr *pfx, unsigned int plen)
2739{
2740 struct inet6_ifaddr *ifp;
2741 struct inet6_dev *idev;
2742 struct net_device *dev;
2743
2744 if (plen > 128)
2745 return -EINVAL;
2746
2747 dev = __dev_get_by_index(net, ifindex);
2748 if (!dev)
2749 return -ENODEV;
2750
2751 idev = __in6_dev_get(dev);
2752 if (!idev)
2753 return -ENXIO;
2754
2755 read_lock_bh(&idev->lock);
2756 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2757 if (ifp->prefix_len == plen &&
2758 ipv6_addr_equal(pfx, &ifp->addr)) {
2759 in6_ifa_hold(ifp);
2760 read_unlock_bh(&idev->lock);
2761
2762 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2763 (ifa_flags & IFA_F_MANAGETEMPADDR))
2764 manage_tempaddrs(idev, ifp, 0, 0, false,
2765 jiffies);
2766 ipv6_del_addr(ifp);
2767 addrconf_verify_rtnl();
2768 if (ipv6_addr_is_multicast(pfx)) {
2769 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2770 false, pfx, dev->ifindex);
2771 }
2772 return 0;
2773 }
2774 }
2775 read_unlock_bh(&idev->lock);
2776 return -EADDRNOTAVAIL;
2777}
2778
2779
2780int addrconf_add_ifaddr(struct net *net, void __user *arg)
2781{
2782 struct in6_ifreq ireq;
2783 int err;
2784
2785 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2786 return -EPERM;
2787
2788 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2789 return -EFAULT;
2790
2791 rtnl_lock();
2792 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2793 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2794 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2795 rtnl_unlock();
2796 return err;
2797}
2798
2799int addrconf_del_ifaddr(struct net *net, void __user *arg)
2800{
2801 struct in6_ifreq ireq;
2802 int err;
2803
2804 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2805 return -EPERM;
2806
2807 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2808 return -EFAULT;
2809
2810 rtnl_lock();
2811 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2812 ireq.ifr6_prefixlen);
2813 rtnl_unlock();
2814 return err;
2815}
2816
2817static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2818 int plen, int scope)
2819{
2820 struct inet6_ifaddr *ifp;
2821
2822 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2823 scope, IFA_F_PERMANENT,
2824 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2825 if (!IS_ERR(ifp)) {
2826 spin_lock_bh(&ifp->lock);
2827 ifp->flags &= ~IFA_F_TENTATIVE;
2828 spin_unlock_bh(&ifp->lock);
2829 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2830 in6_ifa_put(ifp);
2831 }
2832}
2833
2834#if IS_ENABLED(CONFIG_IPV6_SIT)
2835static void sit_add_v4_addrs(struct inet6_dev *idev)
2836{
2837 struct in6_addr addr;
2838 struct net_device *dev;
2839 struct net *net = dev_net(idev->dev);
2840 int scope, plen;
2841 u32 pflags = 0;
2842
2843 ASSERT_RTNL();
2844
2845 memset(&addr, 0, sizeof(struct in6_addr));
2846 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2847
2848 if (idev->dev->flags&IFF_POINTOPOINT) {
2849 addr.s6_addr32[0] = htonl(0xfe800000);
2850 scope = IFA_LINK;
2851 plen = 64;
2852 } else {
2853 scope = IPV6_ADDR_COMPATv4;
2854 plen = 96;
2855 pflags |= RTF_NONEXTHOP;
2856 }
2857
2858 if (addr.s6_addr32[3]) {
2859 add_addr(idev, &addr, plen, scope);
2860 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2861 return;
2862 }
2863
2864 for_each_netdev(net, dev) {
2865 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2866 if (in_dev && (dev->flags & IFF_UP)) {
2867 struct in_ifaddr *ifa;
2868
2869 int flag = scope;
2870
2871 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2872
2873 addr.s6_addr32[3] = ifa->ifa_local;
2874
2875 if (ifa->ifa_scope == RT_SCOPE_LINK)
2876 continue;
2877 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2878 if (idev->dev->flags&IFF_POINTOPOINT)
2879 continue;
2880 flag |= IFA_HOST;
2881 }
2882
2883 add_addr(idev, &addr, plen, flag);
2884 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2885 pflags);
2886 }
2887 }
2888 }
2889}
2890#endif
2891
2892static void init_loopback(struct net_device *dev)
2893{
2894 struct inet6_dev *idev;
2895 struct net_device *sp_dev;
2896 struct inet6_ifaddr *sp_ifa;
2897 struct rt6_info *sp_rt;
2898
2899 /* ::1 */
2900
2901 ASSERT_RTNL();
2902
2903 idev = ipv6_find_idev(dev);
2904 if (!idev) {
2905 pr_debug("%s: add_dev failed\n", __func__);
2906 return;
2907 }
2908
2909 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2910
2911 /* Add routes to other interface's IPv6 addresses */
2912 for_each_netdev(dev_net(dev), sp_dev) {
2913 if (!strcmp(sp_dev->name, dev->name))
2914 continue;
2915
2916 idev = __in6_dev_get(sp_dev);
2917 if (!idev)
2918 continue;
2919
2920 read_lock_bh(&idev->lock);
2921 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2922
2923 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2924 continue;
2925
2926 if (sp_ifa->rt) {
2927 /* This dst has been added to garbage list when
2928 * lo device down, release this obsolete dst and
2929 * reallocate a new router for ifa.
2930 */
2931 if (sp_ifa->rt->dst.obsolete > 0) {
2932 ip6_rt_put(sp_ifa->rt);
2933 sp_ifa->rt = NULL;
2934 } else {
2935 continue;
2936 }
2937 }
2938
2939 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2940
2941 /* Failure cases are ignored */
2942 if (!IS_ERR(sp_rt)) {
2943 sp_ifa->rt = sp_rt;
2944 ip6_ins_rt(sp_rt);
2945 }
2946 }
2947 read_unlock_bh(&idev->lock);
2948 }
2949}
2950
2951static void addrconf_add_linklocal(struct inet6_dev *idev,
2952 const struct in6_addr *addr, u32 flags)
2953{
2954 struct inet6_ifaddr *ifp;
2955 u32 addr_flags = flags | IFA_F_PERMANENT;
2956
2957#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2958 if (idev->cnf.optimistic_dad &&
2959 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2960 addr_flags |= IFA_F_OPTIMISTIC;
2961#endif
2962
2963 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2964 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2965 if (!IS_ERR(ifp)) {
2966 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2967 addrconf_dad_start(ifp);
2968 in6_ifa_put(ifp);
2969 }
2970}
2971
2972static bool ipv6_reserved_interfaceid(struct in6_addr address)
2973{
2974 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2975 return true;
2976
2977 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2978 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2979 return true;
2980
2981 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2982 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2983 return true;
2984
2985 return false;
2986}
2987
2988static int ipv6_generate_stable_address(struct in6_addr *address,
2989 u8 dad_count,
2990 const struct inet6_dev *idev)
2991{
2992 static DEFINE_SPINLOCK(lock);
2993 static __u32 digest[SHA_DIGEST_WORDS];
2994 static __u32 workspace[SHA_WORKSPACE_WORDS];
2995
2996 static union {
2997 char __data[SHA_MESSAGE_BYTES];
2998 struct {
2999 struct in6_addr secret;
3000 __be32 prefix[2];
3001 unsigned char hwaddr[MAX_ADDR_LEN];
3002 u8 dad_count;
3003 } __packed;
3004 } data;
3005
3006 struct in6_addr secret;
3007 struct in6_addr temp;
3008 struct net *net = dev_net(idev->dev);
3009
3010 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3011
3012 if (idev->cnf.stable_secret.initialized)
3013 secret = idev->cnf.stable_secret.secret;
3014 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3015 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3016 else
3017 return -1;
3018
3019retry:
3020 spin_lock_bh(&lock);
3021
3022 sha_init(digest);
3023 memset(&data, 0, sizeof(data));
3024 memset(workspace, 0, sizeof(workspace));
3025 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3026 data.prefix[0] = address->s6_addr32[0];
3027 data.prefix[1] = address->s6_addr32[1];
3028 data.secret = secret;
3029 data.dad_count = dad_count;
3030
3031 sha_transform(digest, data.__data, workspace);
3032
3033 temp = *address;
3034 temp.s6_addr32[2] = (__force __be32)digest[0];
3035 temp.s6_addr32[3] = (__force __be32)digest[1];
3036
3037 spin_unlock_bh(&lock);
3038
3039 if (ipv6_reserved_interfaceid(temp)) {
3040 dad_count++;
3041 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3042 return -1;
3043 goto retry;
3044 }
3045
3046 *address = temp;
3047 return 0;
3048}
3049
3050static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3051{
3052 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3053
3054 if (s->initialized)
3055 return;
3056 s = &idev->cnf.stable_secret;
3057 get_random_bytes(&s->secret, sizeof(s->secret));
3058 s->initialized = true;
3059}
3060
3061static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3062{
3063 struct in6_addr addr;
3064
3065 /* no link local addresses on L3 master devices */
3066 if (netif_is_l3_master(idev->dev))
3067 return;
3068
3069 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3070
3071 switch (idev->addr_gen_mode) {
3072 case IN6_ADDR_GEN_MODE_RANDOM:
3073 ipv6_gen_mode_random_init(idev);
3074 /* fallthrough */
3075 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3076 if (!ipv6_generate_stable_address(&addr, 0, idev))
3077 addrconf_add_linklocal(idev, &addr,
3078 IFA_F_STABLE_PRIVACY);
3079 else if (prefix_route)
3080 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3081 break;
3082 case IN6_ADDR_GEN_MODE_EUI64:
3083 /* addrconf_add_linklocal also adds a prefix_route and we
3084 * only need to care about prefix routes if ipv6_generate_eui64
3085 * couldn't generate one.
3086 */
3087 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3088 addrconf_add_linklocal(idev, &addr, 0);
3089 else if (prefix_route)
3090 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3091 break;
3092 case IN6_ADDR_GEN_MODE_NONE:
3093 default:
3094 /* will not add any link local address */
3095 break;
3096 }
3097}
3098
3099static void addrconf_dev_config(struct net_device *dev)
3100{
3101 struct inet6_dev *idev;
3102
3103 ASSERT_RTNL();
3104
3105 if ((dev->type != ARPHRD_ETHER) &&
3106 (dev->type != ARPHRD_FDDI) &&
3107 (dev->type != ARPHRD_ARCNET) &&
3108 (dev->type != ARPHRD_INFINIBAND) &&
3109 (dev->type != ARPHRD_IEEE1394) &&
3110 (dev->type != ARPHRD_TUNNEL6) &&
3111 (dev->type != ARPHRD_6LOWPAN) &&
3112 (dev->type != ARPHRD_NONE)) {
3113 /* Alas, we support only Ethernet autoconfiguration. */
3114 return;
3115 }
3116
3117 idev = addrconf_add_dev(dev);
3118 if (IS_ERR(idev))
3119 return;
3120
3121 /* this device type has no EUI support */
3122 if (dev->type == ARPHRD_NONE &&
3123 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3124 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3125
3126 addrconf_addr_gen(idev, false);
3127}
3128
3129#if IS_ENABLED(CONFIG_IPV6_SIT)
3130static void addrconf_sit_config(struct net_device *dev)
3131{
3132 struct inet6_dev *idev;
3133
3134 ASSERT_RTNL();
3135
3136 /*
3137 * Configure the tunnel with one of our IPv4
3138 * addresses... we should configure all of
3139 * our v4 addrs in the tunnel
3140 */
3141
3142 idev = ipv6_find_idev(dev);
3143 if (!idev) {
3144 pr_debug("%s: add_dev failed\n", __func__);
3145 return;
3146 }
3147
3148 if (dev->priv_flags & IFF_ISATAP) {
3149 addrconf_addr_gen(idev, false);
3150 return;
3151 }
3152
3153 sit_add_v4_addrs(idev);
3154
3155 if (dev->flags&IFF_POINTOPOINT)
3156 addrconf_add_mroute(dev);
3157}
3158#endif
3159
3160#if IS_ENABLED(CONFIG_NET_IPGRE)
3161static void addrconf_gre_config(struct net_device *dev)
3162{
3163 struct inet6_dev *idev;
3164
3165 ASSERT_RTNL();
3166
3167 idev = ipv6_find_idev(dev);
3168 if (!idev) {
3169 pr_debug("%s: add_dev failed\n", __func__);
3170 return;
3171 }
3172
3173 addrconf_addr_gen(idev, true);
3174 if (dev->flags & IFF_POINTOPOINT)
3175 addrconf_add_mroute(dev);
3176}
3177#endif
3178
3179static int fixup_permanent_addr(struct inet6_dev *idev,
3180 struct inet6_ifaddr *ifp)
3181{
3182 if (!ifp->rt) {
3183 struct rt6_info *rt;
3184
3185 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3186 if (unlikely(IS_ERR(rt)))
3187 return PTR_ERR(rt);
3188
3189 ifp->rt = rt;
3190 }
3191
3192 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3193 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3194 idev->dev, 0, 0);
3195 }
3196
3197 addrconf_dad_start(ifp);
3198
3199 return 0;
3200}
3201
3202static void addrconf_permanent_addr(struct net_device *dev)
3203{
3204 struct inet6_ifaddr *ifp, *tmp;
3205 struct inet6_dev *idev;
3206
3207 idev = __in6_dev_get(dev);
3208 if (!idev)
3209 return;
3210
3211 write_lock_bh(&idev->lock);
3212
3213 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3214 if ((ifp->flags & IFA_F_PERMANENT) &&
3215 fixup_permanent_addr(idev, ifp) < 0) {
3216 write_unlock_bh(&idev->lock);
3217 ipv6_del_addr(ifp);
3218 write_lock_bh(&idev->lock);
3219
3220 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3221 idev->dev->name, &ifp->addr);
3222 }
3223 }
3224
3225 write_unlock_bh(&idev->lock);
3226}
3227
3228static int addrconf_notify(struct notifier_block *this, unsigned long event,
3229 void *ptr)
3230{
3231 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3232 struct netdev_notifier_changeupper_info *info;
3233 struct inet6_dev *idev = __in6_dev_get(dev);
3234 int run_pending = 0;
3235 int err;
3236
3237 switch (event) {
3238 case NETDEV_REGISTER:
3239 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3240 idev = ipv6_add_dev(dev);
3241 if (IS_ERR(idev))
3242 return notifier_from_errno(PTR_ERR(idev));
3243 }
3244 break;
3245
3246 case NETDEV_CHANGEMTU:
3247 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3248 if (dev->mtu < IPV6_MIN_MTU) {
3249 addrconf_ifdown(dev, 1);
3250 break;
3251 }
3252
3253 if (idev) {
3254 rt6_mtu_change(dev, dev->mtu);
3255 idev->cnf.mtu6 = dev->mtu;
3256 break;
3257 }
3258
3259 /* allocate new idev */
3260 idev = ipv6_add_dev(dev);
3261 if (IS_ERR(idev))
3262 break;
3263
3264 /* device is still not ready */
3265 if (!(idev->if_flags & IF_READY))
3266 break;
3267
3268 run_pending = 1;
3269
3270 /* fall through */
3271
3272 case NETDEV_UP:
3273 case NETDEV_CHANGE:
3274 if (dev->flags & IFF_SLAVE)
3275 break;
3276
3277 if (idev && idev->cnf.disable_ipv6)
3278 break;
3279
3280 if (event == NETDEV_UP) {
3281 /* restore routes for permanent addresses */
3282 addrconf_permanent_addr(dev);
3283
3284 if (!addrconf_qdisc_ok(dev)) {
3285 /* device is not ready yet. */
3286 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3287 dev->name);
3288 break;
3289 }
3290
3291 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3292 idev = ipv6_add_dev(dev);
3293
3294 if (!IS_ERR_OR_NULL(idev)) {
3295 idev->if_flags |= IF_READY;
3296 run_pending = 1;
3297 }
3298 } else if (event == NETDEV_CHANGE) {
3299 if (!addrconf_qdisc_ok(dev)) {
3300 /* device is still not ready. */
3301 break;
3302 }
3303
3304 if (idev) {
3305 if (idev->if_flags & IF_READY)
3306 /* device is already configured. */
3307 break;
3308 idev->if_flags |= IF_READY;
3309 }
3310
3311 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3312 dev->name);
3313
3314 run_pending = 1;
3315 }
3316
3317 switch (dev->type) {
3318#if IS_ENABLED(CONFIG_IPV6_SIT)
3319 case ARPHRD_SIT:
3320 addrconf_sit_config(dev);
3321 break;
3322#endif
3323#if IS_ENABLED(CONFIG_NET_IPGRE)
3324 case ARPHRD_IPGRE:
3325 addrconf_gre_config(dev);
3326 break;
3327#endif
3328 case ARPHRD_LOOPBACK:
3329 init_loopback(dev);
3330 break;
3331
3332 default:
3333 addrconf_dev_config(dev);
3334 break;
3335 }
3336
3337 if (!IS_ERR_OR_NULL(idev)) {
3338 if (run_pending)
3339 addrconf_dad_run(idev);
3340
3341 /*
3342 * If the MTU changed during the interface down,
3343 * when the interface up, the changed MTU must be
3344 * reflected in the idev as well as routers.
3345 */
3346 if (idev->cnf.mtu6 != dev->mtu &&
3347 dev->mtu >= IPV6_MIN_MTU) {
3348 rt6_mtu_change(dev, dev->mtu);
3349 idev->cnf.mtu6 = dev->mtu;
3350 }
3351 idev->tstamp = jiffies;
3352 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3353
3354 /*
3355 * If the changed mtu during down is lower than
3356 * IPV6_MIN_MTU stop IPv6 on this interface.
3357 */
3358 if (dev->mtu < IPV6_MIN_MTU)
3359 addrconf_ifdown(dev, 1);
3360 }
3361 break;
3362
3363 case NETDEV_DOWN:
3364 case NETDEV_UNREGISTER:
3365 /*
3366 * Remove all addresses from this interface.
3367 */
3368 addrconf_ifdown(dev, event != NETDEV_DOWN);
3369 break;
3370
3371 case NETDEV_CHANGENAME:
3372 if (idev) {
3373 snmp6_unregister_dev(idev);
3374 addrconf_sysctl_unregister(idev);
3375 err = addrconf_sysctl_register(idev);
3376 if (err)
3377 return notifier_from_errno(err);
3378 err = snmp6_register_dev(idev);
3379 if (err) {
3380 addrconf_sysctl_unregister(idev);
3381 return notifier_from_errno(err);
3382 }
3383 }
3384 break;
3385
3386 case NETDEV_PRE_TYPE_CHANGE:
3387 case NETDEV_POST_TYPE_CHANGE:
3388 if (idev)
3389 addrconf_type_change(dev, event);
3390 break;
3391
3392 case NETDEV_CHANGEUPPER:
3393 info = ptr;
3394
3395 /* flush all routes if dev is linked to or unlinked from
3396 * an L3 master device (e.g., VRF)
3397 */
3398 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3399 addrconf_ifdown(dev, 0);
3400 }
3401
3402 return NOTIFY_OK;
3403}
3404
3405/*
3406 * addrconf module should be notified of a device going up
3407 */
3408static struct notifier_block ipv6_dev_notf = {
3409 .notifier_call = addrconf_notify,
3410};
3411
3412static void addrconf_type_change(struct net_device *dev, unsigned long event)
3413{
3414 struct inet6_dev *idev;
3415 ASSERT_RTNL();
3416
3417 idev = __in6_dev_get(dev);
3418
3419 if (event == NETDEV_POST_TYPE_CHANGE)
3420 ipv6_mc_remap(idev);
3421 else if (event == NETDEV_PRE_TYPE_CHANGE)
3422 ipv6_mc_unmap(idev);
3423}
3424
3425static bool addr_is_local(const struct in6_addr *addr)
3426{
3427 return ipv6_addr_type(addr) &
3428 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3429}
3430
3431static int addrconf_ifdown(struct net_device *dev, int how)
3432{
3433 struct net *net = dev_net(dev);
3434 struct inet6_dev *idev;
3435 struct inet6_ifaddr *ifa, *tmp;
3436 struct list_head del_list;
3437 int _keep_addr;
3438 bool keep_addr;
3439 int state, i;
3440
3441 ASSERT_RTNL();
3442
3443 rt6_ifdown(net, dev);
3444 neigh_ifdown(&nd_tbl, dev);
3445
3446 idev = __in6_dev_get(dev);
3447 if (!idev)
3448 return -ENODEV;
3449
3450 /*
3451 * Step 1: remove reference to ipv6 device from parent device.
3452 * Do not dev_put!
3453 */
3454 if (how) {
3455 idev->dead = 1;
3456
3457 /* protected by rtnl_lock */
3458 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3459
3460 /* Step 1.5: remove snmp6 entry */
3461 snmp6_unregister_dev(idev);
3462
3463 }
3464
3465 /* aggregate the system setting and interface setting */
3466 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3467 if (!_keep_addr)
3468 _keep_addr = idev->cnf.keep_addr_on_down;
3469
3470 /* combine the user config with event to determine if permanent
3471 * addresses are to be removed from address hash table
3472 */
3473 keep_addr = !(how || _keep_addr <= 0);
3474
3475 /* Step 2: clear hash table */
3476 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3477 struct hlist_head *h = &inet6_addr_lst[i];
3478
3479 spin_lock_bh(&addrconf_hash_lock);
3480restart:
3481 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3482 if (ifa->idev == idev) {
3483 addrconf_del_dad_work(ifa);
3484 /* combined flag + permanent flag decide if
3485 * address is retained on a down event
3486 */
3487 if (!keep_addr ||
3488 !(ifa->flags & IFA_F_PERMANENT) ||
3489 addr_is_local(&ifa->addr)) {
3490 hlist_del_init_rcu(&ifa->addr_lst);
3491 goto restart;
3492 }
3493 }
3494 }
3495 spin_unlock_bh(&addrconf_hash_lock);
3496 }
3497
3498 write_lock_bh(&idev->lock);
3499
3500 addrconf_del_rs_timer(idev);
3501
3502 /* Step 2: clear flags for stateless addrconf */
3503 if (!how)
3504 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3505
3506 if (how && del_timer(&idev->regen_timer))
3507 in6_dev_put(idev);
3508
3509 /* Step 3: clear tempaddr list */
3510 while (!list_empty(&idev->tempaddr_list)) {
3511 ifa = list_first_entry(&idev->tempaddr_list,
3512 struct inet6_ifaddr, tmp_list);
3513 list_del(&ifa->tmp_list);
3514 write_unlock_bh(&idev->lock);
3515 spin_lock_bh(&ifa->lock);
3516
3517 if (ifa->ifpub) {
3518 in6_ifa_put(ifa->ifpub);
3519 ifa->ifpub = NULL;
3520 }
3521 spin_unlock_bh(&ifa->lock);
3522 in6_ifa_put(ifa);
3523 write_lock_bh(&idev->lock);
3524 }
3525
3526 /* re-combine the user config with event to determine if permanent
3527 * addresses are to be removed from the interface list
3528 */
3529 keep_addr = (!how && _keep_addr > 0);
3530
3531 INIT_LIST_HEAD(&del_list);
3532 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3533 struct rt6_info *rt = NULL;
3534
3535 addrconf_del_dad_work(ifa);
3536
3537 write_unlock_bh(&idev->lock);
3538 spin_lock_bh(&ifa->lock);
3539
3540 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3541 !addr_is_local(&ifa->addr)) {
3542 /* set state to skip the notifier below */
3543 state = INET6_IFADDR_STATE_DEAD;
3544 ifa->state = 0;
3545 if (!(ifa->flags & IFA_F_NODAD))
3546 ifa->flags |= IFA_F_TENTATIVE;
3547
3548 rt = ifa->rt;
3549 ifa->rt = NULL;
3550 } else {
3551 state = ifa->state;
3552 ifa->state = INET6_IFADDR_STATE_DEAD;
3553
3554 list_del(&ifa->if_list);
3555 list_add(&ifa->if_list, &del_list);
3556 }
3557
3558 spin_unlock_bh(&ifa->lock);
3559
3560 if (rt)
3561 ip6_del_rt(rt);
3562
3563 if (state != INET6_IFADDR_STATE_DEAD) {
3564 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3565 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3566 }
3567
3568 write_lock_bh(&idev->lock);
3569 }
3570
3571 write_unlock_bh(&idev->lock);
3572
3573 /* now clean up addresses to be removed */
3574 while (!list_empty(&del_list)) {
3575 ifa = list_first_entry(&del_list,
3576 struct inet6_ifaddr, if_list);
3577 list_del(&ifa->if_list);
3578
3579 in6_ifa_put(ifa);
3580 }
3581
3582 /* Step 5: Discard anycast and multicast list */
3583 if (how) {
3584 ipv6_ac_destroy_dev(idev);
3585 ipv6_mc_destroy_dev(idev);
3586 } else {
3587 ipv6_mc_down(idev);
3588 }
3589
3590 idev->tstamp = jiffies;
3591
3592 /* Last: Shot the device (if unregistered) */
3593 if (how) {
3594 addrconf_sysctl_unregister(idev);
3595 neigh_parms_release(&nd_tbl, idev->nd_parms);
3596 neigh_ifdown(&nd_tbl, dev);
3597 in6_dev_put(idev);
3598 }
3599 return 0;
3600}
3601
3602static void addrconf_rs_timer(unsigned long data)
3603{
3604 struct inet6_dev *idev = (struct inet6_dev *)data;
3605 struct net_device *dev = idev->dev;
3606 struct in6_addr lladdr;
3607
3608 write_lock(&idev->lock);
3609 if (idev->dead || !(idev->if_flags & IF_READY))
3610 goto out;
3611
3612 if (!ipv6_accept_ra(idev))
3613 goto out;
3614
3615 /* Announcement received after solicitation was sent */
3616 if (idev->if_flags & IF_RA_RCVD)
3617 goto out;
3618
3619 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3620 write_unlock(&idev->lock);
3621 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3622 ndisc_send_rs(dev, &lladdr,
3623 &in6addr_linklocal_allrouters);
3624 else
3625 goto put;
3626
3627 write_lock(&idev->lock);
3628 /* The wait after the last probe can be shorter */
3629 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3630 idev->cnf.rtr_solicits) ?
3631 idev->cnf.rtr_solicit_delay :
3632 idev->cnf.rtr_solicit_interval);
3633 } else {
3634 /*
3635 * Note: we do not support deprecated "all on-link"
3636 * assumption any longer.
3637 */
3638 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3639 }
3640
3641out:
3642 write_unlock(&idev->lock);
3643put:
3644 in6_dev_put(idev);
3645}
3646
3647/*
3648 * Duplicate Address Detection
3649 */
3650static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3651{
3652 unsigned long rand_num;
3653 struct inet6_dev *idev = ifp->idev;
3654
3655 if (ifp->flags & IFA_F_OPTIMISTIC)
3656 rand_num = 0;
3657 else
3658 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3659
3660 ifp->dad_probes = idev->cnf.dad_transmits;
3661 addrconf_mod_dad_work(ifp, rand_num);
3662}
3663
3664static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3665{
3666 struct inet6_dev *idev = ifp->idev;
3667 struct net_device *dev = idev->dev;
3668 bool notify = false;
3669
3670 addrconf_join_solict(dev, &ifp->addr);
3671
3672 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3673
3674 read_lock_bh(&idev->lock);
3675 spin_lock(&ifp->lock);
3676 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3677 goto out;
3678
3679 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3680 idev->cnf.accept_dad < 1 ||
3681 !(ifp->flags&IFA_F_TENTATIVE) ||
3682 ifp->flags & IFA_F_NODAD) {
3683 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3684 spin_unlock(&ifp->lock);
3685 read_unlock_bh(&idev->lock);
3686
3687 addrconf_dad_completed(ifp);
3688 return;
3689 }
3690
3691 if (!(idev->if_flags & IF_READY)) {
3692 spin_unlock(&ifp->lock);
3693 read_unlock_bh(&idev->lock);
3694 /*
3695 * If the device is not ready:
3696 * - keep it tentative if it is a permanent address.
3697 * - otherwise, kill it.
3698 */
3699 in6_ifa_hold(ifp);
3700 addrconf_dad_stop(ifp, 0);
3701 return;
3702 }
3703
3704 /*
3705 * Optimistic nodes can start receiving
3706 * Frames right away
3707 */
3708 if (ifp->flags & IFA_F_OPTIMISTIC) {
3709 ip6_ins_rt(ifp->rt);
3710 if (ipv6_use_optimistic_addr(idev)) {
3711 /* Because optimistic nodes can use this address,
3712 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3713 */
3714 notify = true;
3715 }
3716 }
3717
3718 addrconf_dad_kick(ifp);
3719out:
3720 spin_unlock(&ifp->lock);
3721 read_unlock_bh(&idev->lock);
3722 if (notify)
3723 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3724}
3725
3726static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3727{
3728 bool begin_dad = false;
3729
3730 spin_lock_bh(&ifp->lock);
3731 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3732 ifp->state = INET6_IFADDR_STATE_PREDAD;
3733 begin_dad = true;
3734 }
3735 spin_unlock_bh(&ifp->lock);
3736
3737 if (begin_dad)
3738 addrconf_mod_dad_work(ifp, 0);
3739}
3740
3741static void addrconf_dad_work(struct work_struct *w)
3742{
3743 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3744 struct inet6_ifaddr,
3745 dad_work);
3746 struct inet6_dev *idev = ifp->idev;
3747 struct in6_addr mcaddr;
3748
3749 enum {
3750 DAD_PROCESS,
3751 DAD_BEGIN,
3752 DAD_ABORT,
3753 } action = DAD_PROCESS;
3754
3755 rtnl_lock();
3756
3757 spin_lock_bh(&ifp->lock);
3758 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3759 action = DAD_BEGIN;
3760 ifp->state = INET6_IFADDR_STATE_DAD;
3761 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3762 action = DAD_ABORT;
3763 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3764 }
3765 spin_unlock_bh(&ifp->lock);
3766
3767 if (action == DAD_BEGIN) {
3768 addrconf_dad_begin(ifp);
3769 goto out;
3770 } else if (action == DAD_ABORT) {
3771 addrconf_dad_stop(ifp, 1);
3772 goto out;
3773 }
3774
3775 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3776 goto out;
3777
3778 write_lock_bh(&idev->lock);
3779 if (idev->dead || !(idev->if_flags & IF_READY)) {
3780 write_unlock_bh(&idev->lock);
3781 goto out;
3782 }
3783
3784 spin_lock(&ifp->lock);
3785 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3786 spin_unlock(&ifp->lock);
3787 write_unlock_bh(&idev->lock);
3788 goto out;
3789 }
3790
3791 if (ifp->dad_probes == 0) {
3792 /*
3793 * DAD was successful
3794 */
3795
3796 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3797 spin_unlock(&ifp->lock);
3798 write_unlock_bh(&idev->lock);
3799
3800 addrconf_dad_completed(ifp);
3801
3802 goto out;
3803 }
3804
3805 ifp->dad_probes--;
3806 addrconf_mod_dad_work(ifp,
3807 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3808 spin_unlock(&ifp->lock);
3809 write_unlock_bh(&idev->lock);
3810
3811 /* send a neighbour solicitation for our addr */
3812 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3813 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3814out:
3815 in6_ifa_put(ifp);
3816 rtnl_unlock();
3817}
3818
3819/* ifp->idev must be at least read locked */
3820static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3821{
3822 struct inet6_ifaddr *ifpiter;
3823 struct inet6_dev *idev = ifp->idev;
3824
3825 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3826 if (ifpiter->scope > IFA_LINK)
3827 break;
3828 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3829 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3830 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3831 IFA_F_PERMANENT)
3832 return false;
3833 }
3834 return true;
3835}
3836
3837static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3838{
3839 struct net_device *dev = ifp->idev->dev;
3840 struct in6_addr lladdr;
3841 bool send_rs, send_mld;
3842
3843 addrconf_del_dad_work(ifp);
3844
3845 /*
3846 * Configure the address for reception. Now it is valid.
3847 */
3848
3849 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3850
3851 /* If added prefix is link local and we are prepared to process
3852 router advertisements, start sending router solicitations.
3853 */
3854
3855 read_lock_bh(&ifp->idev->lock);
3856 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3857 send_rs = send_mld &&
3858 ipv6_accept_ra(ifp->idev) &&
3859 ifp->idev->cnf.rtr_solicits > 0 &&
3860 (dev->flags&IFF_LOOPBACK) == 0;
3861 read_unlock_bh(&ifp->idev->lock);
3862
3863 /* While dad is in progress mld report's source address is in6_addrany.
3864 * Resend with proper ll now.
3865 */
3866 if (send_mld)
3867 ipv6_mc_dad_complete(ifp->idev);
3868
3869 if (send_rs) {
3870 /*
3871 * If a host as already performed a random delay
3872 * [...] as part of DAD [...] there is no need
3873 * to delay again before sending the first RS
3874 */
3875 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3876 return;
3877 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3878
3879 write_lock_bh(&ifp->idev->lock);
3880 spin_lock(&ifp->lock);
3881 ifp->idev->rs_probes = 1;
3882 ifp->idev->if_flags |= IF_RS_SENT;
3883 addrconf_mod_rs_timer(ifp->idev,
3884 ifp->idev->cnf.rtr_solicit_interval);
3885 spin_unlock(&ifp->lock);
3886 write_unlock_bh(&ifp->idev->lock);
3887 }
3888}
3889
3890static void addrconf_dad_run(struct inet6_dev *idev)
3891{
3892 struct inet6_ifaddr *ifp;
3893
3894 read_lock_bh(&idev->lock);
3895 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3896 spin_lock(&ifp->lock);
3897 if (ifp->flags & IFA_F_TENTATIVE &&
3898 ifp->state == INET6_IFADDR_STATE_DAD)
3899 addrconf_dad_kick(ifp);
3900 spin_unlock(&ifp->lock);
3901 }
3902 read_unlock_bh(&idev->lock);
3903}
3904
3905#ifdef CONFIG_PROC_FS
3906struct if6_iter_state {
3907 struct seq_net_private p;
3908 int bucket;
3909 int offset;
3910};
3911
3912static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3913{
3914 struct inet6_ifaddr *ifa = NULL;
3915 struct if6_iter_state *state = seq->private;
3916 struct net *net = seq_file_net(seq);
3917 int p = 0;
3918
3919 /* initial bucket if pos is 0 */
3920 if (pos == 0) {
3921 state->bucket = 0;
3922 state->offset = 0;
3923 }
3924
3925 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3926 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3927 addr_lst) {
3928 if (!net_eq(dev_net(ifa->idev->dev), net))
3929 continue;
3930 /* sync with offset */
3931 if (p < state->offset) {
3932 p++;
3933 continue;
3934 }
3935 state->offset++;
3936 return ifa;
3937 }
3938
3939 /* prepare for next bucket */
3940 state->offset = 0;
3941 p = 0;
3942 }
3943 return NULL;
3944}
3945
3946static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3947 struct inet6_ifaddr *ifa)
3948{
3949 struct if6_iter_state *state = seq->private;
3950 struct net *net = seq_file_net(seq);
3951
3952 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3953 if (!net_eq(dev_net(ifa->idev->dev), net))
3954 continue;
3955 state->offset++;
3956 return ifa;
3957 }
3958
3959 while (++state->bucket < IN6_ADDR_HSIZE) {
3960 state->offset = 0;
3961 hlist_for_each_entry_rcu_bh(ifa,
3962 &inet6_addr_lst[state->bucket], addr_lst) {
3963 if (!net_eq(dev_net(ifa->idev->dev), net))
3964 continue;
3965 state->offset++;
3966 return ifa;
3967 }
3968 }
3969
3970 return NULL;
3971}
3972
3973static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3974 __acquires(rcu_bh)
3975{
3976 rcu_read_lock_bh();
3977 return if6_get_first(seq, *pos);
3978}
3979
3980static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3981{
3982 struct inet6_ifaddr *ifa;
3983
3984 ifa = if6_get_next(seq, v);
3985 ++*pos;
3986 return ifa;
3987}
3988
3989static void if6_seq_stop(struct seq_file *seq, void *v)
3990 __releases(rcu_bh)
3991{
3992 rcu_read_unlock_bh();
3993}
3994
3995static int if6_seq_show(struct seq_file *seq, void *v)
3996{
3997 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3998 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3999 &ifp->addr,
4000 ifp->idev->dev->ifindex,
4001 ifp->prefix_len,
4002 ifp->scope,
4003 (u8) ifp->flags,
4004 ifp->idev->dev->name);
4005 return 0;
4006}
4007
4008static const struct seq_operations if6_seq_ops = {
4009 .start = if6_seq_start,
4010 .next = if6_seq_next,
4011 .show = if6_seq_show,
4012 .stop = if6_seq_stop,
4013};
4014
4015static int if6_seq_open(struct inode *inode, struct file *file)
4016{
4017 return seq_open_net(inode, file, &if6_seq_ops,
4018 sizeof(struct if6_iter_state));
4019}
4020
4021static const struct file_operations if6_fops = {
4022 .owner = THIS_MODULE,
4023 .open = if6_seq_open,
4024 .read = seq_read,
4025 .llseek = seq_lseek,
4026 .release = seq_release_net,
4027};
4028
4029static int __net_init if6_proc_net_init(struct net *net)
4030{
4031 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4032 return -ENOMEM;
4033 return 0;
4034}
4035
4036static void __net_exit if6_proc_net_exit(struct net *net)
4037{
4038 remove_proc_entry("if_inet6", net->proc_net);
4039}
4040
4041static struct pernet_operations if6_proc_net_ops = {
4042 .init = if6_proc_net_init,
4043 .exit = if6_proc_net_exit,
4044};
4045
4046int __init if6_proc_init(void)
4047{
4048 return register_pernet_subsys(&if6_proc_net_ops);
4049}
4050
4051void if6_proc_exit(void)
4052{
4053 unregister_pernet_subsys(&if6_proc_net_ops);
4054}
4055#endif /* CONFIG_PROC_FS */
4056
4057#if IS_ENABLED(CONFIG_IPV6_MIP6)
4058/* Check if address is a home address configured on any interface. */
4059int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4060{
4061 int ret = 0;
4062 struct inet6_ifaddr *ifp = NULL;
4063 unsigned int hash = inet6_addr_hash(addr);
4064
4065 rcu_read_lock_bh();
4066 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4067 if (!net_eq(dev_net(ifp->idev->dev), net))
4068 continue;
4069 if (ipv6_addr_equal(&ifp->addr, addr) &&
4070 (ifp->flags & IFA_F_HOMEADDRESS)) {
4071 ret = 1;
4072 break;
4073 }
4074 }
4075 rcu_read_unlock_bh();
4076 return ret;
4077}
4078#endif
4079
4080/*
4081 * Periodic address status verification
4082 */
4083
4084static void addrconf_verify_rtnl(void)
4085{
4086 unsigned long now, next, next_sec, next_sched;
4087 struct inet6_ifaddr *ifp;
4088 int i;
4089
4090 ASSERT_RTNL();
4091
4092 rcu_read_lock_bh();
4093 now = jiffies;
4094 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4095
4096 cancel_delayed_work(&addr_chk_work);
4097
4098 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4099restart:
4100 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4101 unsigned long age;
4102
4103 /* When setting preferred_lft to a value not zero or
4104 * infinity, while valid_lft is infinity
4105 * IFA_F_PERMANENT has a non-infinity life time.
4106 */
4107 if ((ifp->flags & IFA_F_PERMANENT) &&
4108 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4109 continue;
4110
4111 spin_lock(&ifp->lock);
4112 /* We try to batch several events at once. */
4113 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4114
4115 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4116 age >= ifp->valid_lft) {
4117 spin_unlock(&ifp->lock);
4118 in6_ifa_hold(ifp);
4119 ipv6_del_addr(ifp);
4120 goto restart;
4121 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4122 spin_unlock(&ifp->lock);
4123 continue;
4124 } else if (age >= ifp->prefered_lft) {
4125 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4126 int deprecate = 0;
4127
4128 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4129 deprecate = 1;
4130 ifp->flags |= IFA_F_DEPRECATED;
4131 }
4132
4133 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4134 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4135 next = ifp->tstamp + ifp->valid_lft * HZ;
4136
4137 spin_unlock(&ifp->lock);
4138
4139 if (deprecate) {
4140 in6_ifa_hold(ifp);
4141
4142 ipv6_ifa_notify(0, ifp);
4143 in6_ifa_put(ifp);
4144 goto restart;
4145 }
4146 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4147 !(ifp->flags&IFA_F_TENTATIVE)) {
4148 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4149 ifp->idev->cnf.dad_transmits *
4150 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4151
4152 if (age >= ifp->prefered_lft - regen_advance) {
4153 struct inet6_ifaddr *ifpub = ifp->ifpub;
4154 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4155 next = ifp->tstamp + ifp->prefered_lft * HZ;
4156 if (!ifp->regen_count && ifpub) {
4157 ifp->regen_count++;
4158 in6_ifa_hold(ifp);
4159 in6_ifa_hold(ifpub);
4160 spin_unlock(&ifp->lock);
4161
4162 spin_lock(&ifpub->lock);
4163 ifpub->regen_count = 0;
4164 spin_unlock(&ifpub->lock);
4165 ipv6_create_tempaddr(ifpub, ifp);
4166 in6_ifa_put(ifpub);
4167 in6_ifa_put(ifp);
4168 goto restart;
4169 }
4170 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4171 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4172 spin_unlock(&ifp->lock);
4173 } else {
4174 /* ifp->prefered_lft <= ifp->valid_lft */
4175 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4176 next = ifp->tstamp + ifp->prefered_lft * HZ;
4177 spin_unlock(&ifp->lock);
4178 }
4179 }
4180 }
4181
4182 next_sec = round_jiffies_up(next);
4183 next_sched = next;
4184
4185 /* If rounded timeout is accurate enough, accept it. */
4186 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4187 next_sched = next_sec;
4188
4189 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4190 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4191 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4192
4193 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4194 now, next, next_sec, next_sched);
4195 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4196 rcu_read_unlock_bh();
4197}
4198
4199static void addrconf_verify_work(struct work_struct *w)
4200{
4201 rtnl_lock();
4202 addrconf_verify_rtnl();
4203 rtnl_unlock();
4204}
4205
4206static void addrconf_verify(void)
4207{
4208 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4209}
4210
4211static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4212 struct in6_addr **peer_pfx)
4213{
4214 struct in6_addr *pfx = NULL;
4215
4216 *peer_pfx = NULL;
4217
4218 if (addr)
4219 pfx = nla_data(addr);
4220
4221 if (local) {
4222 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4223 *peer_pfx = pfx;
4224 pfx = nla_data(local);
4225 }
4226
4227 return pfx;
4228}
4229
4230static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4231 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4232 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4233 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4234 [IFA_FLAGS] = { .len = sizeof(u32) },
4235};
4236
4237static int
4238inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4239{
4240 struct net *net = sock_net(skb->sk);
4241 struct ifaddrmsg *ifm;
4242 struct nlattr *tb[IFA_MAX+1];
4243 struct in6_addr *pfx, *peer_pfx;
4244 u32 ifa_flags;
4245 int err;
4246
4247 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4248 if (err < 0)
4249 return err;
4250
4251 ifm = nlmsg_data(nlh);
4252 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4253 if (!pfx)
4254 return -EINVAL;
4255
4256 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4257
4258 /* We ignore other flags so far. */
4259 ifa_flags &= IFA_F_MANAGETEMPADDR;
4260
4261 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4262 ifm->ifa_prefixlen);
4263}
4264
4265static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4266 u32 prefered_lft, u32 valid_lft)
4267{
4268 u32 flags;
4269 clock_t expires;
4270 unsigned long timeout;
4271 bool was_managetempaddr;
4272 bool had_prefixroute;
4273
4274 ASSERT_RTNL();
4275
4276 if (!valid_lft || (prefered_lft > valid_lft))
4277 return -EINVAL;
4278
4279 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4280 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4281 return -EINVAL;
4282
4283 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4284 if (addrconf_finite_timeout(timeout)) {
4285 expires = jiffies_to_clock_t(timeout * HZ);
4286 valid_lft = timeout;
4287 flags = RTF_EXPIRES;
4288 } else {
4289 expires = 0;
4290 flags = 0;
4291 ifa_flags |= IFA_F_PERMANENT;
4292 }
4293
4294 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4295 if (addrconf_finite_timeout(timeout)) {
4296 if (timeout == 0)
4297 ifa_flags |= IFA_F_DEPRECATED;
4298 prefered_lft = timeout;
4299 }
4300
4301 spin_lock_bh(&ifp->lock);
4302 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4303 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4304 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4305 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4306 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4307 IFA_F_NOPREFIXROUTE);
4308 ifp->flags |= ifa_flags;
4309 ifp->tstamp = jiffies;
4310 ifp->valid_lft = valid_lft;
4311 ifp->prefered_lft = prefered_lft;
4312
4313 spin_unlock_bh(&ifp->lock);
4314 if (!(ifp->flags&IFA_F_TENTATIVE))
4315 ipv6_ifa_notify(0, ifp);
4316
4317 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4318 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4319 expires, flags);
4320 } else if (had_prefixroute) {
4321 enum cleanup_prefix_rt_t action;
4322 unsigned long rt_expires;
4323
4324 write_lock_bh(&ifp->idev->lock);
4325 action = check_cleanup_prefix_route(ifp, &rt_expires);
4326 write_unlock_bh(&ifp->idev->lock);
4327
4328 if (action != CLEANUP_PREFIX_RT_NOP) {
4329 cleanup_prefix_route(ifp, rt_expires,
4330 action == CLEANUP_PREFIX_RT_DEL);
4331 }
4332 }
4333
4334 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4335 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4336 valid_lft = prefered_lft = 0;
4337 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4338 !was_managetempaddr, jiffies);
4339 }
4340
4341 addrconf_verify_rtnl();
4342
4343 return 0;
4344}
4345
4346static int
4347inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4348{
4349 struct net *net = sock_net(skb->sk);
4350 struct ifaddrmsg *ifm;
4351 struct nlattr *tb[IFA_MAX+1];
4352 struct in6_addr *pfx, *peer_pfx;
4353 struct inet6_ifaddr *ifa;
4354 struct net_device *dev;
4355 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4356 u32 ifa_flags;
4357 int err;
4358
4359 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4360 if (err < 0)
4361 return err;
4362
4363 ifm = nlmsg_data(nlh);
4364 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4365 if (!pfx)
4366 return -EINVAL;
4367
4368 if (tb[IFA_CACHEINFO]) {
4369 struct ifa_cacheinfo *ci;
4370
4371 ci = nla_data(tb[IFA_CACHEINFO]);
4372 valid_lft = ci->ifa_valid;
4373 preferred_lft = ci->ifa_prefered;
4374 } else {
4375 preferred_lft = INFINITY_LIFE_TIME;
4376 valid_lft = INFINITY_LIFE_TIME;
4377 }
4378
4379 dev = __dev_get_by_index(net, ifm->ifa_index);
4380 if (!dev)
4381 return -ENODEV;
4382
4383 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4384
4385 /* We ignore other flags so far. */
4386 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4387 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4388
4389 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4390 if (!ifa) {
4391 /*
4392 * It would be best to check for !NLM_F_CREATE here but
4393 * userspace already relies on not having to provide this.
4394 */
4395 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4396 ifm->ifa_prefixlen, ifa_flags,
4397 preferred_lft, valid_lft);
4398 }
4399
4400 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4401 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4402 err = -EEXIST;
4403 else
4404 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4405
4406 in6_ifa_put(ifa);
4407
4408 return err;
4409}
4410
4411static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4412 u8 scope, int ifindex)
4413{
4414 struct ifaddrmsg *ifm;
4415
4416 ifm = nlmsg_data(nlh);
4417 ifm->ifa_family = AF_INET6;
4418 ifm->ifa_prefixlen = prefixlen;
4419 ifm->ifa_flags = flags;
4420 ifm->ifa_scope = scope;
4421 ifm->ifa_index = ifindex;
4422}
4423
4424static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4425 unsigned long tstamp, u32 preferred, u32 valid)
4426{
4427 struct ifa_cacheinfo ci;
4428
4429 ci.cstamp = cstamp_delta(cstamp);
4430 ci.tstamp = cstamp_delta(tstamp);
4431 ci.ifa_prefered = preferred;
4432 ci.ifa_valid = valid;
4433
4434 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4435}
4436
4437static inline int rt_scope(int ifa_scope)
4438{
4439 if (ifa_scope & IFA_HOST)
4440 return RT_SCOPE_HOST;
4441 else if (ifa_scope & IFA_LINK)
4442 return RT_SCOPE_LINK;
4443 else if (ifa_scope & IFA_SITE)
4444 return RT_SCOPE_SITE;
4445 else
4446 return RT_SCOPE_UNIVERSE;
4447}
4448
4449static inline int inet6_ifaddr_msgsize(void)
4450{
4451 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4452 + nla_total_size(16) /* IFA_LOCAL */
4453 + nla_total_size(16) /* IFA_ADDRESS */
4454 + nla_total_size(sizeof(struct ifa_cacheinfo))
4455 + nla_total_size(4) /* IFA_FLAGS */;
4456}
4457
4458static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4459 u32 portid, u32 seq, int event, unsigned int flags)
4460{
4461 struct nlmsghdr *nlh;
4462 u32 preferred, valid;
4463
4464 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4465 if (!nlh)
4466 return -EMSGSIZE;
4467
4468 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4469 ifa->idev->dev->ifindex);
4470
4471 if (!((ifa->flags&IFA_F_PERMANENT) &&
4472 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4473 preferred = ifa->prefered_lft;
4474 valid = ifa->valid_lft;
4475 if (preferred != INFINITY_LIFE_TIME) {
4476 long tval = (jiffies - ifa->tstamp)/HZ;
4477 if (preferred > tval)
4478 preferred -= tval;
4479 else
4480 preferred = 0;
4481 if (valid != INFINITY_LIFE_TIME) {
4482 if (valid > tval)
4483 valid -= tval;
4484 else
4485 valid = 0;
4486 }
4487 }
4488 } else {
4489 preferred = INFINITY_LIFE_TIME;
4490 valid = INFINITY_LIFE_TIME;
4491 }
4492
4493 if (!ipv6_addr_any(&ifa->peer_addr)) {
4494 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4495 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4496 goto error;
4497 } else
4498 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4499 goto error;
4500
4501 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4502 goto error;
4503
4504 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4505 goto error;
4506
4507 nlmsg_end(skb, nlh);
4508 return 0;
4509
4510error:
4511 nlmsg_cancel(skb, nlh);
4512 return -EMSGSIZE;
4513}
4514
4515static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4516 u32 portid, u32 seq, int event, u16 flags)
4517{
4518 struct nlmsghdr *nlh;
4519 u8 scope = RT_SCOPE_UNIVERSE;
4520 int ifindex = ifmca->idev->dev->ifindex;
4521
4522 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4523 scope = RT_SCOPE_SITE;
4524
4525 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4526 if (!nlh)
4527 return -EMSGSIZE;
4528
4529 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4530 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4531 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4532 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4533 nlmsg_cancel(skb, nlh);
4534 return -EMSGSIZE;
4535 }
4536
4537 nlmsg_end(skb, nlh);
4538 return 0;
4539}
4540
4541static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4542 u32 portid, u32 seq, int event, unsigned int flags)
4543{
4544 struct nlmsghdr *nlh;
4545 u8 scope = RT_SCOPE_UNIVERSE;
4546 int ifindex = ifaca->aca_idev->dev->ifindex;
4547
4548 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4549 scope = RT_SCOPE_SITE;
4550
4551 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4552 if (!nlh)
4553 return -EMSGSIZE;
4554
4555 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4556 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4557 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4558 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4559 nlmsg_cancel(skb, nlh);
4560 return -EMSGSIZE;
4561 }
4562
4563 nlmsg_end(skb, nlh);
4564 return 0;
4565}
4566
4567enum addr_type_t {
4568 UNICAST_ADDR,
4569 MULTICAST_ADDR,
4570 ANYCAST_ADDR,
4571};
4572
4573/* called with rcu_read_lock() */
4574static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4575 struct netlink_callback *cb, enum addr_type_t type,
4576 int s_ip_idx, int *p_ip_idx)
4577{
4578 struct ifmcaddr6 *ifmca;
4579 struct ifacaddr6 *ifaca;
4580 int err = 1;
4581 int ip_idx = *p_ip_idx;
4582
4583 read_lock_bh(&idev->lock);
4584 switch (type) {
4585 case UNICAST_ADDR: {
4586 struct inet6_ifaddr *ifa;
4587
4588 /* unicast address incl. temp addr */
4589 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4590 if (++ip_idx < s_ip_idx)
4591 continue;
4592 err = inet6_fill_ifaddr(skb, ifa,
4593 NETLINK_CB(cb->skb).portid,
4594 cb->nlh->nlmsg_seq,
4595 RTM_NEWADDR,
4596 NLM_F_MULTI);
4597 if (err < 0)
4598 break;
4599 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4600 }
4601 break;
4602 }
4603 case MULTICAST_ADDR:
4604 /* multicast address */
4605 for (ifmca = idev->mc_list; ifmca;
4606 ifmca = ifmca->next, ip_idx++) {
4607 if (ip_idx < s_ip_idx)
4608 continue;
4609 err = inet6_fill_ifmcaddr(skb, ifmca,
4610 NETLINK_CB(cb->skb).portid,
4611 cb->nlh->nlmsg_seq,
4612 RTM_GETMULTICAST,
4613 NLM_F_MULTI);
4614 if (err < 0)
4615 break;
4616 }
4617 break;
4618 case ANYCAST_ADDR:
4619 /* anycast address */
4620 for (ifaca = idev->ac_list; ifaca;
4621 ifaca = ifaca->aca_next, ip_idx++) {
4622 if (ip_idx < s_ip_idx)
4623 continue;
4624 err = inet6_fill_ifacaddr(skb, ifaca,
4625 NETLINK_CB(cb->skb).portid,
4626 cb->nlh->nlmsg_seq,
4627 RTM_GETANYCAST,
4628 NLM_F_MULTI);
4629 if (err < 0)
4630 break;
4631 }
4632 break;
4633 default:
4634 break;
4635 }
4636 read_unlock_bh(&idev->lock);
4637 *p_ip_idx = ip_idx;
4638 return err;
4639}
4640
4641static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4642 enum addr_type_t type)
4643{
4644 struct net *net = sock_net(skb->sk);
4645 int h, s_h;
4646 int idx, ip_idx;
4647 int s_idx, s_ip_idx;
4648 struct net_device *dev;
4649 struct inet6_dev *idev;
4650 struct hlist_head *head;
4651
4652 s_h = cb->args[0];
4653 s_idx = idx = cb->args[1];
4654 s_ip_idx = ip_idx = cb->args[2];
4655
4656 rcu_read_lock();
4657 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4658 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4659 idx = 0;
4660 head = &net->dev_index_head[h];
4661 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4662 if (idx < s_idx)
4663 goto cont;
4664 if (h > s_h || idx > s_idx)
4665 s_ip_idx = 0;
4666 ip_idx = 0;
4667 idev = __in6_dev_get(dev);
4668 if (!idev)
4669 goto cont;
4670
4671 if (in6_dump_addrs(idev, skb, cb, type,
4672 s_ip_idx, &ip_idx) < 0)
4673 goto done;
4674cont:
4675 idx++;
4676 }
4677 }
4678done:
4679 rcu_read_unlock();
4680 cb->args[0] = h;
4681 cb->args[1] = idx;
4682 cb->args[2] = ip_idx;
4683
4684 return skb->len;
4685}
4686
4687static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4688{
4689 enum addr_type_t type = UNICAST_ADDR;
4690
4691 return inet6_dump_addr(skb, cb, type);
4692}
4693
4694static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4695{
4696 enum addr_type_t type = MULTICAST_ADDR;
4697
4698 return inet6_dump_addr(skb, cb, type);
4699}
4700
4701
4702static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4703{
4704 enum addr_type_t type = ANYCAST_ADDR;
4705
4706 return inet6_dump_addr(skb, cb, type);
4707}
4708
4709static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4710{
4711 struct net *net = sock_net(in_skb->sk);
4712 struct ifaddrmsg *ifm;
4713 struct nlattr *tb[IFA_MAX+1];
4714 struct in6_addr *addr = NULL, *peer;
4715 struct net_device *dev = NULL;
4716 struct inet6_ifaddr *ifa;
4717 struct sk_buff *skb;
4718 int err;
4719
4720 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4721 if (err < 0)
4722 goto errout;
4723
4724 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4725 if (!addr) {
4726 err = -EINVAL;
4727 goto errout;
4728 }
4729
4730 ifm = nlmsg_data(nlh);
4731 if (ifm->ifa_index)
4732 dev = __dev_get_by_index(net, ifm->ifa_index);
4733
4734 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4735 if (!ifa) {
4736 err = -EADDRNOTAVAIL;
4737 goto errout;
4738 }
4739
4740 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4741 if (!skb) {
4742 err = -ENOBUFS;
4743 goto errout_ifa;
4744 }
4745
4746 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4747 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4748 if (err < 0) {
4749 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4750 WARN_ON(err == -EMSGSIZE);
4751 kfree_skb(skb);
4752 goto errout_ifa;
4753 }
4754 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4755errout_ifa:
4756 in6_ifa_put(ifa);
4757errout:
4758 return err;
4759}
4760
4761static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4762{
4763 struct sk_buff *skb;
4764 struct net *net = dev_net(ifa->idev->dev);
4765 int err = -ENOBUFS;
4766
4767 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4768 if (!skb)
4769 goto errout;
4770
4771 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4772 if (err < 0) {
4773 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4774 WARN_ON(err == -EMSGSIZE);
4775 kfree_skb(skb);
4776 goto errout;
4777 }
4778 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4779 return;
4780errout:
4781 if (err < 0)
4782 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4783}
4784
4785static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4786 __s32 *array, int bytes)
4787{
4788 BUG_ON(bytes < (DEVCONF_MAX * 4));
4789
4790 memset(array, 0, bytes);
4791 array[DEVCONF_FORWARDING] = cnf->forwarding;
4792 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4793 array[DEVCONF_MTU6] = cnf->mtu6;
4794 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4795 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4796 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4797 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4798 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4799 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4800 jiffies_to_msecs(cnf->rtr_solicit_interval);
4801 array[DEVCONF_RTR_SOLICIT_DELAY] =
4802 jiffies_to_msecs(cnf->rtr_solicit_delay);
4803 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4804 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4805 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4806 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4807 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4808 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4809 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4810 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4811 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4812 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4813 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4814 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4815 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4816 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4817#ifdef CONFIG_IPV6_ROUTER_PREF
4818 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4819 array[DEVCONF_RTR_PROBE_INTERVAL] =
4820 jiffies_to_msecs(cnf->rtr_probe_interval);
4821#ifdef CONFIG_IPV6_ROUTE_INFO
4822 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4823#endif
4824#endif
4825 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4826 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4827#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4828 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4829 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4830#endif
4831#ifdef CONFIG_IPV6_MROUTE
4832 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4833#endif
4834 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4835 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4836 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4837 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4838 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4839 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4840 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4841 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4842 /* we omit DEVCONF_STABLE_SECRET for now */
4843 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4844 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4845 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4846 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4847}
4848
4849static inline size_t inet6_ifla6_size(void)
4850{
4851 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4852 + nla_total_size(sizeof(struct ifla_cacheinfo))
4853 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4854 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4855 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4856 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4857}
4858
4859static inline size_t inet6_if_nlmsg_size(void)
4860{
4861 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4862 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4863 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4864 + nla_total_size(4) /* IFLA_MTU */
4865 + nla_total_size(4) /* IFLA_LINK */
4866 + nla_total_size(1) /* IFLA_OPERSTATE */
4867 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4868}
4869
4870static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4871 int items, int bytes)
4872{
4873 int i;
4874 int pad = bytes - sizeof(u64) * items;
4875 BUG_ON(pad < 0);
4876
4877 /* Use put_unaligned() because stats may not be aligned for u64. */
4878 put_unaligned(items, &stats[0]);
4879 for (i = 1; i < items; i++)
4880 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4881
4882 memset(&stats[items], 0, pad);
4883}
4884
4885static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4886 int bytes, size_t syncpoff)
4887{
4888 int i, c;
4889 u64 buff[IPSTATS_MIB_MAX];
4890 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4891
4892 BUG_ON(pad < 0);
4893
4894 memset(buff, 0, sizeof(buff));
4895 buff[0] = IPSTATS_MIB_MAX;
4896
4897 for_each_possible_cpu(c) {
4898 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4899 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4900 }
4901
4902 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4903 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4904}
4905
4906static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4907 int bytes)
4908{
4909 switch (attrtype) {
4910 case IFLA_INET6_STATS:
4911 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4912 offsetof(struct ipstats_mib, syncp));
4913 break;
4914 case IFLA_INET6_ICMP6STATS:
4915 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4916 break;
4917 }
4918}
4919
4920static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4921 u32 ext_filter_mask)
4922{
4923 struct nlattr *nla;
4924 struct ifla_cacheinfo ci;
4925
4926 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4927 goto nla_put_failure;
4928 ci.max_reasm_len = IPV6_MAXPLEN;
4929 ci.tstamp = cstamp_delta(idev->tstamp);
4930 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4931 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4932 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4933 goto nla_put_failure;
4934 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4935 if (!nla)
4936 goto nla_put_failure;
4937 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4938
4939 /* XXX - MC not implemented */
4940
4941 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4942 return 0;
4943
4944 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4945 if (!nla)
4946 goto nla_put_failure;
4947 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4948
4949 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4950 if (!nla)
4951 goto nla_put_failure;
4952 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4953
4954 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4955 if (!nla)
4956 goto nla_put_failure;
4957
4958 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4959 goto nla_put_failure;
4960
4961 read_lock_bh(&idev->lock);
4962 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4963 read_unlock_bh(&idev->lock);
4964
4965 return 0;
4966
4967nla_put_failure:
4968 return -EMSGSIZE;
4969}
4970
4971static size_t inet6_get_link_af_size(const struct net_device *dev,
4972 u32 ext_filter_mask)
4973{
4974 if (!__in6_dev_get(dev))
4975 return 0;
4976
4977 return inet6_ifla6_size();
4978}
4979
4980static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4981 u32 ext_filter_mask)
4982{
4983 struct inet6_dev *idev = __in6_dev_get(dev);
4984
4985 if (!idev)
4986 return -ENODATA;
4987
4988 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4989 return -EMSGSIZE;
4990
4991 return 0;
4992}
4993
4994static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4995{
4996 struct inet6_ifaddr *ifp;
4997 struct net_device *dev = idev->dev;
4998 bool update_rs = false;
4999 struct in6_addr ll_addr;
5000
5001 ASSERT_RTNL();
5002
5003 if (!token)
5004 return -EINVAL;
5005 if (ipv6_addr_any(token))
5006 return -EINVAL;
5007 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5008 return -EINVAL;
5009 if (!ipv6_accept_ra(idev))
5010 return -EINVAL;
5011 if (idev->cnf.rtr_solicits <= 0)
5012 return -EINVAL;
5013
5014 write_lock_bh(&idev->lock);
5015
5016 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5017 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5018
5019 write_unlock_bh(&idev->lock);
5020
5021 if (!idev->dead && (idev->if_flags & IF_READY) &&
5022 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5023 IFA_F_OPTIMISTIC)) {
5024
5025 /* If we're not ready, then normal ifup will take care
5026 * of this. Otherwise, we need to request our rs here.
5027 */
5028 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5029 update_rs = true;
5030 }
5031
5032 write_lock_bh(&idev->lock);
5033
5034 if (update_rs) {
5035 idev->if_flags |= IF_RS_SENT;
5036 idev->rs_probes = 1;
5037 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
5038 }
5039
5040 /* Well, that's kinda nasty ... */
5041 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5042 spin_lock(&ifp->lock);
5043 if (ifp->tokenized) {
5044 ifp->valid_lft = 0;
5045 ifp->prefered_lft = 0;
5046 }
5047 spin_unlock(&ifp->lock);
5048 }
5049
5050 write_unlock_bh(&idev->lock);
5051 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5052 addrconf_verify_rtnl();
5053 return 0;
5054}
5055
5056static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5057 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5058 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5059};
5060
5061static int inet6_validate_link_af(const struct net_device *dev,
5062 const struct nlattr *nla)
5063{
5064 struct nlattr *tb[IFLA_INET6_MAX + 1];
5065
5066 if (dev && !__in6_dev_get(dev))
5067 return -EAFNOSUPPORT;
5068
5069 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5070}
5071
5072static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5073{
5074 int err = -EINVAL;
5075 struct inet6_dev *idev = __in6_dev_get(dev);
5076 struct nlattr *tb[IFLA_INET6_MAX + 1];
5077
5078 if (!idev)
5079 return -EAFNOSUPPORT;
5080
5081 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5082 BUG();
5083
5084 if (tb[IFLA_INET6_TOKEN]) {
5085 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5086 if (err)
5087 return err;
5088 }
5089
5090 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5091 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5092
5093 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5094 mode != IN6_ADDR_GEN_MODE_NONE &&
5095 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5096 mode != IN6_ADDR_GEN_MODE_RANDOM)
5097 return -EINVAL;
5098
5099 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5100 !idev->cnf.stable_secret.initialized &&
5101 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5102 return -EINVAL;
5103
5104 idev->addr_gen_mode = mode;
5105 err = 0;
5106 }
5107
5108 return err;
5109}
5110
5111static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5112 u32 portid, u32 seq, int event, unsigned int flags)
5113{
5114 struct net_device *dev = idev->dev;
5115 struct ifinfomsg *hdr;
5116 struct nlmsghdr *nlh;
5117 void *protoinfo;
5118
5119 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5120 if (!nlh)
5121 return -EMSGSIZE;
5122
5123 hdr = nlmsg_data(nlh);
5124 hdr->ifi_family = AF_INET6;
5125 hdr->__ifi_pad = 0;
5126 hdr->ifi_type = dev->type;
5127 hdr->ifi_index = dev->ifindex;
5128 hdr->ifi_flags = dev_get_flags(dev);
5129 hdr->ifi_change = 0;
5130
5131 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5132 (dev->addr_len &&
5133 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5134 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5135 (dev->ifindex != dev_get_iflink(dev) &&
5136 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5137 nla_put_u8(skb, IFLA_OPERSTATE,
5138 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5139 goto nla_put_failure;
5140 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5141 if (!protoinfo)
5142 goto nla_put_failure;
5143
5144 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5145 goto nla_put_failure;
5146
5147 nla_nest_end(skb, protoinfo);
5148 nlmsg_end(skb, nlh);
5149 return 0;
5150
5151nla_put_failure:
5152 nlmsg_cancel(skb, nlh);
5153 return -EMSGSIZE;
5154}
5155
5156static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5157{
5158 struct net *net = sock_net(skb->sk);
5159 int h, s_h;
5160 int idx = 0, s_idx;
5161 struct net_device *dev;
5162 struct inet6_dev *idev;
5163 struct hlist_head *head;
5164
5165 s_h = cb->args[0];
5166 s_idx = cb->args[1];
5167
5168 rcu_read_lock();
5169 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5170 idx = 0;
5171 head = &net->dev_index_head[h];
5172 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5173 if (idx < s_idx)
5174 goto cont;
5175 idev = __in6_dev_get(dev);
5176 if (!idev)
5177 goto cont;
5178 if (inet6_fill_ifinfo(skb, idev,
5179 NETLINK_CB(cb->skb).portid,
5180 cb->nlh->nlmsg_seq,
5181 RTM_NEWLINK, NLM_F_MULTI) < 0)
5182 goto out;
5183cont:
5184 idx++;
5185 }
5186 }
5187out:
5188 rcu_read_unlock();
5189 cb->args[1] = idx;
5190 cb->args[0] = h;
5191
5192 return skb->len;
5193}
5194
5195void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5196{
5197 struct sk_buff *skb;
5198 struct net *net = dev_net(idev->dev);
5199 int err = -ENOBUFS;
5200
5201 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5202 if (!skb)
5203 goto errout;
5204
5205 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5206 if (err < 0) {
5207 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5208 WARN_ON(err == -EMSGSIZE);
5209 kfree_skb(skb);
5210 goto errout;
5211 }
5212 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5213 return;
5214errout:
5215 if (err < 0)
5216 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5217}
5218
5219static inline size_t inet6_prefix_nlmsg_size(void)
5220{
5221 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5222 + nla_total_size(sizeof(struct in6_addr))
5223 + nla_total_size(sizeof(struct prefix_cacheinfo));
5224}
5225
5226static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5227 struct prefix_info *pinfo, u32 portid, u32 seq,
5228 int event, unsigned int flags)
5229{
5230 struct prefixmsg *pmsg;
5231 struct nlmsghdr *nlh;
5232 struct prefix_cacheinfo ci;
5233
5234 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5235 if (!nlh)
5236 return -EMSGSIZE;
5237
5238 pmsg = nlmsg_data(nlh);
5239 pmsg->prefix_family = AF_INET6;
5240 pmsg->prefix_pad1 = 0;
5241 pmsg->prefix_pad2 = 0;
5242 pmsg->prefix_ifindex = idev->dev->ifindex;
5243 pmsg->prefix_len = pinfo->prefix_len;
5244 pmsg->prefix_type = pinfo->type;
5245 pmsg->prefix_pad3 = 0;
5246 pmsg->prefix_flags = 0;
5247 if (pinfo->onlink)
5248 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5249 if (pinfo->autoconf)
5250 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5251
5252 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5253 goto nla_put_failure;
5254 ci.preferred_time = ntohl(pinfo->prefered);
5255 ci.valid_time = ntohl(pinfo->valid);
5256 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5257 goto nla_put_failure;
5258 nlmsg_end(skb, nlh);
5259 return 0;
5260
5261nla_put_failure:
5262 nlmsg_cancel(skb, nlh);
5263 return -EMSGSIZE;
5264}
5265
5266static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5267 struct prefix_info *pinfo)
5268{
5269 struct sk_buff *skb;
5270 struct net *net = dev_net(idev->dev);
5271 int err = -ENOBUFS;
5272
5273 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5274 if (!skb)
5275 goto errout;
5276
5277 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5278 if (err < 0) {
5279 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5280 WARN_ON(err == -EMSGSIZE);
5281 kfree_skb(skb);
5282 goto errout;
5283 }
5284 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5285 return;
5286errout:
5287 if (err < 0)
5288 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5289}
5290
5291static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5292{
5293 struct net *net = dev_net(ifp->idev->dev);
5294
5295 if (event)
5296 ASSERT_RTNL();
5297
5298 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5299
5300 switch (event) {
5301 case RTM_NEWADDR:
5302 /*
5303 * If the address was optimistic
5304 * we inserted the route at the start of
5305 * our DAD process, so we don't need
5306 * to do it again
5307 */
5308 if (!(ifp->rt->rt6i_node))
5309 ip6_ins_rt(ifp->rt);
5310 if (ifp->idev->cnf.forwarding)
5311 addrconf_join_anycast(ifp);
5312 if (!ipv6_addr_any(&ifp->peer_addr))
5313 addrconf_prefix_route(&ifp->peer_addr, 128,
5314 ifp->idev->dev, 0, 0);
5315 break;
5316 case RTM_DELADDR:
5317 if (ifp->idev->cnf.forwarding)
5318 addrconf_leave_anycast(ifp);
5319 addrconf_leave_solict(ifp->idev, &ifp->addr);
5320 if (!ipv6_addr_any(&ifp->peer_addr)) {
5321 struct rt6_info *rt;
5322
5323 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5324 ifp->idev->dev, 0, 0);
5325 if (rt)
5326 ip6_del_rt(rt);
5327 }
5328 if (ifp->rt) {
5329 dst_hold(&ifp->rt->dst);
5330 ip6_del_rt(ifp->rt);
5331 }
5332 rt_genid_bump_ipv6(net);
5333 break;
5334 }
5335 atomic_inc(&net->ipv6.dev_addr_genid);
5336}
5337
5338static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5339{
5340 rcu_read_lock_bh();
5341 if (likely(ifp->idev->dead == 0))
5342 __ipv6_ifa_notify(event, ifp);
5343 rcu_read_unlock_bh();
5344}
5345
5346#ifdef CONFIG_SYSCTL
5347
5348static
5349int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5350 void __user *buffer, size_t *lenp, loff_t *ppos)
5351{
5352 int *valp = ctl->data;
5353 int val = *valp;
5354 loff_t pos = *ppos;
5355 struct ctl_table lctl;
5356 int ret;
5357
5358 /*
5359 * ctl->data points to idev->cnf.forwarding, we should
5360 * not modify it until we get the rtnl lock.
5361 */
5362 lctl = *ctl;
5363 lctl.data = &val;
5364
5365 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5366
5367 if (write)
5368 ret = addrconf_fixup_forwarding(ctl, valp, val);
5369 if (ret)
5370 *ppos = pos;
5371 return ret;
5372}
5373
5374static
5375int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5376 void __user *buffer, size_t *lenp, loff_t *ppos)
5377{
5378 struct ctl_table lctl;
5379 int min_hl = 1, max_hl = 255;
5380
5381 lctl = *ctl;
5382 lctl.extra1 = &min_hl;
5383 lctl.extra2 = &max_hl;
5384
5385 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5386}
5387
5388static
5389int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5390 void __user *buffer, size_t *lenp, loff_t *ppos)
5391{
5392 struct inet6_dev *idev = ctl->extra1;
5393 int min_mtu = IPV6_MIN_MTU;
5394 struct ctl_table lctl;
5395
5396 lctl = *ctl;
5397 lctl.extra1 = &min_mtu;
5398 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5399
5400 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5401}
5402
5403static void dev_disable_change(struct inet6_dev *idev)
5404{
5405 struct netdev_notifier_info info;
5406
5407 if (!idev || !idev->dev)
5408 return;
5409
5410 netdev_notifier_info_init(&info, idev->dev);
5411 if (idev->cnf.disable_ipv6)
5412 addrconf_notify(NULL, NETDEV_DOWN, &info);
5413 else
5414 addrconf_notify(NULL, NETDEV_UP, &info);
5415}
5416
5417static void addrconf_disable_change(struct net *net, __s32 newf)
5418{
5419 struct net_device *dev;
5420 struct inet6_dev *idev;
5421
5422 rcu_read_lock();
5423 for_each_netdev_rcu(net, dev) {
5424 idev = __in6_dev_get(dev);
5425 if (idev) {
5426 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5427 idev->cnf.disable_ipv6 = newf;
5428 if (changed)
5429 dev_disable_change(idev);
5430 }
5431 }
5432 rcu_read_unlock();
5433}
5434
5435static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5436{
5437 struct net *net;
5438 int old;
5439
5440 if (!rtnl_trylock())
5441 return restart_syscall();
5442
5443 net = (struct net *)table->extra2;
5444 old = *p;
5445 *p = newf;
5446
5447 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5448 rtnl_unlock();
5449 return 0;
5450 }
5451
5452 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5453 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5454 addrconf_disable_change(net, newf);
5455 } else if ((!newf) ^ (!old))
5456 dev_disable_change((struct inet6_dev *)table->extra1);
5457
5458 rtnl_unlock();
5459 return 0;
5460}
5461
5462static
5463int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5464 void __user *buffer, size_t *lenp, loff_t *ppos)
5465{
5466 int *valp = ctl->data;
5467 int val = *valp;
5468 loff_t pos = *ppos;
5469 struct ctl_table lctl;
5470 int ret;
5471
5472 /*
5473 * ctl->data points to idev->cnf.disable_ipv6, we should
5474 * not modify it until we get the rtnl lock.
5475 */
5476 lctl = *ctl;
5477 lctl.data = &val;
5478
5479 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5480
5481 if (write)
5482 ret = addrconf_disable_ipv6(ctl, valp, val);
5483 if (ret)
5484 *ppos = pos;
5485 return ret;
5486}
5487
5488static
5489int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5490 void __user *buffer, size_t *lenp, loff_t *ppos)
5491{
5492 int *valp = ctl->data;
5493 int ret;
5494 int old, new;
5495
5496 old = *valp;
5497 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5498 new = *valp;
5499
5500 if (write && old != new) {
5501 struct net *net = ctl->extra2;
5502
5503 if (!rtnl_trylock())
5504 return restart_syscall();
5505
5506 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5507 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5508 NETCONFA_IFINDEX_DEFAULT,
5509 net->ipv6.devconf_dflt);
5510 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5511 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5512 NETCONFA_IFINDEX_ALL,
5513 net->ipv6.devconf_all);
5514 else {
5515 struct inet6_dev *idev = ctl->extra1;
5516
5517 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5518 idev->dev->ifindex,
5519 &idev->cnf);
5520 }
5521 rtnl_unlock();
5522 }
5523
5524 return ret;
5525}
5526
5527static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5528 void __user *buffer, size_t *lenp,
5529 loff_t *ppos)
5530{
5531 int err;
5532 struct in6_addr addr;
5533 char str[IPV6_MAX_STRLEN];
5534 struct ctl_table lctl = *ctl;
5535 struct net *net = ctl->extra2;
5536 struct ipv6_stable_secret *secret = ctl->data;
5537
5538 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5539 return -EIO;
5540
5541 lctl.maxlen = IPV6_MAX_STRLEN;
5542 lctl.data = str;
5543
5544 if (!rtnl_trylock())
5545 return restart_syscall();
5546
5547 if (!write && !secret->initialized) {
5548 err = -EIO;
5549 goto out;
5550 }
5551
5552 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5553 if (err >= sizeof(str)) {
5554 err = -EIO;
5555 goto out;
5556 }
5557
5558 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5559 if (err || !write)
5560 goto out;
5561
5562 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5563 err = -EIO;
5564 goto out;
5565 }
5566
5567 secret->initialized = true;
5568 secret->secret = addr;
5569
5570 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5571 struct net_device *dev;
5572
5573 for_each_netdev(net, dev) {
5574 struct inet6_dev *idev = __in6_dev_get(dev);
5575
5576 if (idev) {
5577 idev->addr_gen_mode =
5578 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5579 }
5580 }
5581 } else {
5582 struct inet6_dev *idev = ctl->extra1;
5583
5584 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5585 }
5586
5587out:
5588 rtnl_unlock();
5589
5590 return err;
5591}
5592
5593static
5594int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5595 int write,
5596 void __user *buffer,
5597 size_t *lenp,
5598 loff_t *ppos)
5599{
5600 int *valp = ctl->data;
5601 int val = *valp;
5602 loff_t pos = *ppos;
5603 struct ctl_table lctl;
5604 int ret;
5605
5606 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5607 * we should not modify it until we get the rtnl lock.
5608 */
5609 lctl = *ctl;
5610 lctl.data = &val;
5611
5612 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5613
5614 if (write)
5615 ret = addrconf_fixup_linkdown(ctl, valp, val);
5616 if (ret)
5617 *ppos = pos;
5618 return ret;
5619}
5620
5621static struct addrconf_sysctl_table
5622{
5623 struct ctl_table_header *sysctl_header;
5624 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5625} addrconf_sysctl __read_mostly = {
5626 .sysctl_header = NULL,
5627 .addrconf_vars = {
5628 {
5629 .procname = "forwarding",
5630 .data = &ipv6_devconf.forwarding,
5631 .maxlen = sizeof(int),
5632 .mode = 0644,
5633 .proc_handler = addrconf_sysctl_forward,
5634 },
5635 {
5636 .procname = "hop_limit",
5637 .data = &ipv6_devconf.hop_limit,
5638 .maxlen = sizeof(int),
5639 .mode = 0644,
5640 .proc_handler = addrconf_sysctl_hop_limit,
5641 },
5642 {
5643 .procname = "mtu",
5644 .data = &ipv6_devconf.mtu6,
5645 .maxlen = sizeof(int),
5646 .mode = 0644,
5647 .proc_handler = addrconf_sysctl_mtu,
5648 },
5649 {
5650 .procname = "accept_ra",
5651 .data = &ipv6_devconf.accept_ra,
5652 .maxlen = sizeof(int),
5653 .mode = 0644,
5654 .proc_handler = proc_dointvec,
5655 },
5656 {
5657 .procname = "accept_redirects",
5658 .data = &ipv6_devconf.accept_redirects,
5659 .maxlen = sizeof(int),
5660 .mode = 0644,
5661 .proc_handler = proc_dointvec,
5662 },
5663 {
5664 .procname = "autoconf",
5665 .data = &ipv6_devconf.autoconf,
5666 .maxlen = sizeof(int),
5667 .mode = 0644,
5668 .proc_handler = proc_dointvec,
5669 },
5670 {
5671 .procname = "dad_transmits",
5672 .data = &ipv6_devconf.dad_transmits,
5673 .maxlen = sizeof(int),
5674 .mode = 0644,
5675 .proc_handler = proc_dointvec,
5676 },
5677 {
5678 .procname = "router_solicitations",
5679 .data = &ipv6_devconf.rtr_solicits,
5680 .maxlen = sizeof(int),
5681 .mode = 0644,
5682 .proc_handler = proc_dointvec,
5683 },
5684 {
5685 .procname = "router_solicitation_interval",
5686 .data = &ipv6_devconf.rtr_solicit_interval,
5687 .maxlen = sizeof(int),
5688 .mode = 0644,
5689 .proc_handler = proc_dointvec_jiffies,
5690 },
5691 {
5692 .procname = "router_solicitation_delay",
5693 .data = &ipv6_devconf.rtr_solicit_delay,
5694 .maxlen = sizeof(int),
5695 .mode = 0644,
5696 .proc_handler = proc_dointvec_jiffies,
5697 },
5698 {
5699 .procname = "force_mld_version",
5700 .data = &ipv6_devconf.force_mld_version,
5701 .maxlen = sizeof(int),
5702 .mode = 0644,
5703 .proc_handler = proc_dointvec,
5704 },
5705 {
5706 .procname = "mldv1_unsolicited_report_interval",
5707 .data =
5708 &ipv6_devconf.mldv1_unsolicited_report_interval,
5709 .maxlen = sizeof(int),
5710 .mode = 0644,
5711 .proc_handler = proc_dointvec_ms_jiffies,
5712 },
5713 {
5714 .procname = "mldv2_unsolicited_report_interval",
5715 .data =
5716 &ipv6_devconf.mldv2_unsolicited_report_interval,
5717 .maxlen = sizeof(int),
5718 .mode = 0644,
5719 .proc_handler = proc_dointvec_ms_jiffies,
5720 },
5721 {
5722 .procname = "use_tempaddr",
5723 .data = &ipv6_devconf.use_tempaddr,
5724 .maxlen = sizeof(int),
5725 .mode = 0644,
5726 .proc_handler = proc_dointvec,
5727 },
5728 {
5729 .procname = "temp_valid_lft",
5730 .data = &ipv6_devconf.temp_valid_lft,
5731 .maxlen = sizeof(int),
5732 .mode = 0644,
5733 .proc_handler = proc_dointvec,
5734 },
5735 {
5736 .procname = "temp_prefered_lft",
5737 .data = &ipv6_devconf.temp_prefered_lft,
5738 .maxlen = sizeof(int),
5739 .mode = 0644,
5740 .proc_handler = proc_dointvec,
5741 },
5742 {
5743 .procname = "regen_max_retry",
5744 .data = &ipv6_devconf.regen_max_retry,
5745 .maxlen = sizeof(int),
5746 .mode = 0644,
5747 .proc_handler = proc_dointvec,
5748 },
5749 {
5750 .procname = "max_desync_factor",
5751 .data = &ipv6_devconf.max_desync_factor,
5752 .maxlen = sizeof(int),
5753 .mode = 0644,
5754 .proc_handler = proc_dointvec,
5755 },
5756 {
5757 .procname = "max_addresses",
5758 .data = &ipv6_devconf.max_addresses,
5759 .maxlen = sizeof(int),
5760 .mode = 0644,
5761 .proc_handler = proc_dointvec,
5762 },
5763 {
5764 .procname = "accept_ra_defrtr",
5765 .data = &ipv6_devconf.accept_ra_defrtr,
5766 .maxlen = sizeof(int),
5767 .mode = 0644,
5768 .proc_handler = proc_dointvec,
5769 },
5770 {
5771 .procname = "accept_ra_min_hop_limit",
5772 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5773 .maxlen = sizeof(int),
5774 .mode = 0644,
5775 .proc_handler = proc_dointvec,
5776 },
5777 {
5778 .procname = "accept_ra_pinfo",
5779 .data = &ipv6_devconf.accept_ra_pinfo,
5780 .maxlen = sizeof(int),
5781 .mode = 0644,
5782 .proc_handler = proc_dointvec,
5783 },
5784#ifdef CONFIG_IPV6_ROUTER_PREF
5785 {
5786 .procname = "accept_ra_rtr_pref",
5787 .data = &ipv6_devconf.accept_ra_rtr_pref,
5788 .maxlen = sizeof(int),
5789 .mode = 0644,
5790 .proc_handler = proc_dointvec,
5791 },
5792 {
5793 .procname = "router_probe_interval",
5794 .data = &ipv6_devconf.rtr_probe_interval,
5795 .maxlen = sizeof(int),
5796 .mode = 0644,
5797 .proc_handler = proc_dointvec_jiffies,
5798 },
5799#ifdef CONFIG_IPV6_ROUTE_INFO
5800 {
5801 .procname = "accept_ra_rt_info_max_plen",
5802 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5803 .maxlen = sizeof(int),
5804 .mode = 0644,
5805 .proc_handler = proc_dointvec,
5806 },
5807#endif
5808#endif
5809 {
5810 .procname = "proxy_ndp",
5811 .data = &ipv6_devconf.proxy_ndp,
5812 .maxlen = sizeof(int),
5813 .mode = 0644,
5814 .proc_handler = addrconf_sysctl_proxy_ndp,
5815 },
5816 {
5817 .procname = "accept_source_route",
5818 .data = &ipv6_devconf.accept_source_route,
5819 .maxlen = sizeof(int),
5820 .mode = 0644,
5821 .proc_handler = proc_dointvec,
5822 },
5823#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5824 {
5825 .procname = "optimistic_dad",
5826 .data = &ipv6_devconf.optimistic_dad,
5827 .maxlen = sizeof(int),
5828 .mode = 0644,
5829 .proc_handler = proc_dointvec,
5830
5831 },
5832 {
5833 .procname = "use_optimistic",
5834 .data = &ipv6_devconf.use_optimistic,
5835 .maxlen = sizeof(int),
5836 .mode = 0644,
5837 .proc_handler = proc_dointvec,
5838
5839 },
5840#endif
5841#ifdef CONFIG_IPV6_MROUTE
5842 {
5843 .procname = "mc_forwarding",
5844 .data = &ipv6_devconf.mc_forwarding,
5845 .maxlen = sizeof(int),
5846 .mode = 0444,
5847 .proc_handler = proc_dointvec,
5848 },
5849#endif
5850 {
5851 .procname = "disable_ipv6",
5852 .data = &ipv6_devconf.disable_ipv6,
5853 .maxlen = sizeof(int),
5854 .mode = 0644,
5855 .proc_handler = addrconf_sysctl_disable,
5856 },
5857 {
5858 .procname = "accept_dad",
5859 .data = &ipv6_devconf.accept_dad,
5860 .maxlen = sizeof(int),
5861 .mode = 0644,
5862 .proc_handler = proc_dointvec,
5863 },
5864 {
5865 .procname = "force_tllao",
5866 .data = &ipv6_devconf.force_tllao,
5867 .maxlen = sizeof(int),
5868 .mode = 0644,
5869 .proc_handler = proc_dointvec
5870 },
5871 {
5872 .procname = "ndisc_notify",
5873 .data = &ipv6_devconf.ndisc_notify,
5874 .maxlen = sizeof(int),
5875 .mode = 0644,
5876 .proc_handler = proc_dointvec
5877 },
5878 {
5879 .procname = "suppress_frag_ndisc",
5880 .data = &ipv6_devconf.suppress_frag_ndisc,
5881 .maxlen = sizeof(int),
5882 .mode = 0644,
5883 .proc_handler = proc_dointvec
5884 },
5885 {
5886 .procname = "accept_ra_from_local",
5887 .data = &ipv6_devconf.accept_ra_from_local,
5888 .maxlen = sizeof(int),
5889 .mode = 0644,
5890 .proc_handler = proc_dointvec,
5891 },
5892 {
5893 .procname = "accept_ra_mtu",
5894 .data = &ipv6_devconf.accept_ra_mtu,
5895 .maxlen = sizeof(int),
5896 .mode = 0644,
5897 .proc_handler = proc_dointvec,
5898 },
5899 {
5900 .procname = "stable_secret",
5901 .data = &ipv6_devconf.stable_secret,
5902 .maxlen = IPV6_MAX_STRLEN,
5903 .mode = 0600,
5904 .proc_handler = addrconf_sysctl_stable_secret,
5905 },
5906 {
5907 .procname = "use_oif_addrs_only",
5908 .data = &ipv6_devconf.use_oif_addrs_only,
5909 .maxlen = sizeof(int),
5910 .mode = 0644,
5911 .proc_handler = proc_dointvec,
5912 },
5913 {
5914 .procname = "ignore_routes_with_linkdown",
5915 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5916 .maxlen = sizeof(int),
5917 .mode = 0644,
5918 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5919 },
5920 {
5921 .procname = "drop_unicast_in_l2_multicast",
5922 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
5923 .maxlen = sizeof(int),
5924 .mode = 0644,
5925 .proc_handler = proc_dointvec,
5926 },
5927 {
5928 .procname = "drop_unsolicited_na",
5929 .data = &ipv6_devconf.drop_unsolicited_na,
5930 .maxlen = sizeof(int),
5931 .mode = 0644,
5932 .proc_handler = proc_dointvec,
5933 },
5934 {
5935 .procname = "keep_addr_on_down",
5936 .data = &ipv6_devconf.keep_addr_on_down,
5937 .maxlen = sizeof(int),
5938 .mode = 0644,
5939 .proc_handler = proc_dointvec,
5940
5941 },
5942 {
5943 /* sentinel */
5944 }
5945 },
5946};
5947
5948static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5949 struct inet6_dev *idev, struct ipv6_devconf *p)
5950{
5951 int i;
5952 struct addrconf_sysctl_table *t;
5953 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5954
5955 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5956 if (!t)
5957 goto out;
5958
5959 for (i = 0; t->addrconf_vars[i].data; i++) {
5960 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5961 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5962 t->addrconf_vars[i].extra2 = net;
5963 }
5964
5965 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5966
5967 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5968 if (!t->sysctl_header)
5969 goto free;
5970
5971 p->sysctl = t;
5972 return 0;
5973
5974free:
5975 kfree(t);
5976out:
5977 return -ENOBUFS;
5978}
5979
5980static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5981{
5982 struct addrconf_sysctl_table *t;
5983
5984 if (!p->sysctl)
5985 return;
5986
5987 t = p->sysctl;
5988 p->sysctl = NULL;
5989 unregister_net_sysctl_table(t->sysctl_header);
5990 kfree(t);
5991}
5992
5993static int addrconf_sysctl_register(struct inet6_dev *idev)
5994{
5995 int err;
5996
5997 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5998 return -EINVAL;
5999
6000 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6001 &ndisc_ifinfo_sysctl_change);
6002 if (err)
6003 return err;
6004 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6005 idev, &idev->cnf);
6006 if (err)
6007 neigh_sysctl_unregister(idev->nd_parms);
6008
6009 return err;
6010}
6011
6012static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6013{
6014 __addrconf_sysctl_unregister(&idev->cnf);
6015 neigh_sysctl_unregister(idev->nd_parms);
6016}
6017
6018
6019#endif
6020
6021static int __net_init addrconf_init_net(struct net *net)
6022{
6023 int err = -ENOMEM;
6024 struct ipv6_devconf *all, *dflt;
6025
6026 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6027 if (!all)
6028 goto err_alloc_all;
6029
6030 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6031 if (!dflt)
6032 goto err_alloc_dflt;
6033
6034 /* these will be inherited by all namespaces */
6035 dflt->autoconf = ipv6_defaults.autoconf;
6036 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6037
6038 dflt->stable_secret.initialized = false;
6039 all->stable_secret.initialized = false;
6040
6041 net->ipv6.devconf_all = all;
6042 net->ipv6.devconf_dflt = dflt;
6043
6044#ifdef CONFIG_SYSCTL
6045 err = __addrconf_sysctl_register(net, "all", NULL, all);
6046 if (err < 0)
6047 goto err_reg_all;
6048
6049 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6050 if (err < 0)
6051 goto err_reg_dflt;
6052#endif
6053 return 0;
6054
6055#ifdef CONFIG_SYSCTL
6056err_reg_dflt:
6057 __addrconf_sysctl_unregister(all);
6058err_reg_all:
6059 kfree(dflt);
6060#endif
6061err_alloc_dflt:
6062 kfree(all);
6063err_alloc_all:
6064 return err;
6065}
6066
6067static void __net_exit addrconf_exit_net(struct net *net)
6068{
6069#ifdef CONFIG_SYSCTL
6070 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6071 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6072#endif
6073 kfree(net->ipv6.devconf_dflt);
6074 kfree(net->ipv6.devconf_all);
6075}
6076
6077static struct pernet_operations addrconf_ops = {
6078 .init = addrconf_init_net,
6079 .exit = addrconf_exit_net,
6080};
6081
6082static struct rtnl_af_ops inet6_ops __read_mostly = {
6083 .family = AF_INET6,
6084 .fill_link_af = inet6_fill_link_af,
6085 .get_link_af_size = inet6_get_link_af_size,
6086 .validate_link_af = inet6_validate_link_af,
6087 .set_link_af = inet6_set_link_af,
6088};
6089
6090/*
6091 * Init / cleanup code
6092 */
6093
6094int __init addrconf_init(void)
6095{
6096 struct inet6_dev *idev;
6097 int i, err;
6098
6099 err = ipv6_addr_label_init();
6100 if (err < 0) {
6101 pr_crit("%s: cannot initialize default policy table: %d\n",
6102 __func__, err);
6103 goto out;
6104 }
6105
6106 err = register_pernet_subsys(&addrconf_ops);
6107 if (err < 0)
6108 goto out_addrlabel;
6109
6110 addrconf_wq = create_workqueue("ipv6_addrconf");
6111 if (!addrconf_wq) {
6112 err = -ENOMEM;
6113 goto out_nowq;
6114 }
6115
6116 /* The addrconf netdev notifier requires that loopback_dev
6117 * has it's ipv6 private information allocated and setup
6118 * before it can bring up and give link-local addresses
6119 * to other devices which are up.
6120 *
6121 * Unfortunately, loopback_dev is not necessarily the first
6122 * entry in the global dev_base list of net devices. In fact,
6123 * it is likely to be the very last entry on that list.
6124 * So this causes the notifier registry below to try and
6125 * give link-local addresses to all devices besides loopback_dev
6126 * first, then loopback_dev, which cases all the non-loopback_dev
6127 * devices to fail to get a link-local address.
6128 *
6129 * So, as a temporary fix, allocate the ipv6 structure for
6130 * loopback_dev first by hand.
6131 * Longer term, all of the dependencies ipv6 has upon the loopback
6132 * device and it being up should be removed.
6133 */
6134 rtnl_lock();
6135 idev = ipv6_add_dev(init_net.loopback_dev);
6136 rtnl_unlock();
6137 if (IS_ERR(idev)) {
6138 err = PTR_ERR(idev);
6139 goto errlo;
6140 }
6141
6142 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6143 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6144
6145 register_netdevice_notifier(&ipv6_dev_notf);
6146
6147 addrconf_verify();
6148
6149 rtnl_af_register(&inet6_ops);
6150
6151 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6152 NULL);
6153 if (err < 0)
6154 goto errout;
6155
6156 /* Only the first call to __rtnl_register can fail */
6157 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6158 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6159 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6160 inet6_dump_ifaddr, NULL);
6161 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6162 inet6_dump_ifmcaddr, NULL);
6163 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6164 inet6_dump_ifacaddr, NULL);
6165 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6166 inet6_netconf_dump_devconf, NULL);
6167
6168 ipv6_addr_label_rtnl_register();
6169
6170 return 0;
6171errout:
6172 rtnl_af_unregister(&inet6_ops);
6173 unregister_netdevice_notifier(&ipv6_dev_notf);
6174errlo:
6175 destroy_workqueue(addrconf_wq);
6176out_nowq:
6177 unregister_pernet_subsys(&addrconf_ops);
6178out_addrlabel:
6179 ipv6_addr_label_cleanup();
6180out:
6181 return err;
6182}
6183
6184void addrconf_cleanup(void)
6185{
6186 struct net_device *dev;
6187 int i;
6188
6189 unregister_netdevice_notifier(&ipv6_dev_notf);
6190 unregister_pernet_subsys(&addrconf_ops);
6191 ipv6_addr_label_cleanup();
6192
6193 rtnl_lock();
6194
6195 __rtnl_af_unregister(&inet6_ops);
6196
6197 /* clean dev list */
6198 for_each_netdev(&init_net, dev) {
6199 if (__in6_dev_get(dev) == NULL)
6200 continue;
6201 addrconf_ifdown(dev, 1);
6202 }
6203 addrconf_ifdown(init_net.loopback_dev, 2);
6204
6205 /*
6206 * Check hash table.
6207 */
6208 spin_lock_bh(&addrconf_hash_lock);
6209 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6210 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6211 spin_unlock_bh(&addrconf_hash_lock);
6212 cancel_delayed_work(&addr_chk_work);
6213 rtnl_unlock();
6214
6215 destroy_workqueue(addrconf_wq);
6216}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 */
10
11/*
12 * Changes:
13 *
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
17 * unload.
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
20 * packets.
21 * yoshfuji@USAGI : Fixed interval between DAD
22 * packets.
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
26 * support.
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
31 * seq_file.
32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
34 * status etc.
35 */
36
37#define pr_fmt(fmt) "IPv6: " fmt
38
39#include <linux/errno.h>
40#include <linux/types.h>
41#include <linux/kernel.h>
42#include <linux/sched/signal.h>
43#include <linux/socket.h>
44#include <linux/sockios.h>
45#include <linux/net.h>
46#include <linux/inet.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
49#include <linux/if_addr.h>
50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
56#include <linux/slab.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
60#include <linux/capability.h>
61#include <linux/delay.h>
62#include <linux/notifier.h>
63#include <linux/string.h>
64#include <linux/hash.h>
65
66#include <net/net_namespace.h>
67#include <net/sock.h>
68#include <net/snmp.h>
69
70#include <net/6lowpan.h>
71#include <net/firewire.h>
72#include <net/ipv6.h>
73#include <net/protocol.h>
74#include <net/ndisc.h>
75#include <net/ip6_route.h>
76#include <net/addrconf.h>
77#include <net/tcp.h>
78#include <net/ip.h>
79#include <net/netlink.h>
80#include <net/pkt_sched.h>
81#include <net/l3mdev.h>
82#include <linux/if_tunnel.h>
83#include <linux/rtnetlink.h>
84#include <linux/netconf.h>
85#include <linux/random.h>
86#include <linux/uaccess.h>
87#include <asm/unaligned.h>
88
89#include <linux/proc_fs.h>
90#include <linux/seq_file.h>
91#include <linux/export.h>
92
93#define INFINITY_LIFE_TIME 0xFFFFFFFF
94
95#define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
98static inline u32 cstamp_delta(unsigned long cstamp)
99{
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101}
102
103static inline s32 rfc3315_s14_backoff_init(s32 irt)
104{
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109}
110
111static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112{
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122}
123
124#ifdef CONFIG_SYSCTL
125static int addrconf_sysctl_register(struct inet6_dev *idev);
126static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127#else
128static inline int addrconf_sysctl_register(struct inet6_dev *idev)
129{
130 return 0;
131}
132
133static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134{
135}
136#endif
137
138static void ipv6_gen_rnd_iid(struct in6_addr *addr);
139
140static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
141static int ipv6_count_addresses(const struct inet6_dev *idev);
142static int ipv6_generate_stable_address(struct in6_addr *addr,
143 u8 dad_count,
144 const struct inet6_dev *idev);
145
146#define IN6_ADDR_HSIZE_SHIFT 8
147#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
148/*
149 * Configured unicast address hash table
150 */
151static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
152static DEFINE_SPINLOCK(addrconf_hash_lock);
153
154static void addrconf_verify(void);
155static void addrconf_verify_rtnl(void);
156static void addrconf_verify_work(struct work_struct *);
157
158static struct workqueue_struct *addrconf_wq;
159static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
160
161static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
162static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
163
164static void addrconf_type_change(struct net_device *dev,
165 unsigned long event);
166static int addrconf_ifdown(struct net_device *dev, bool unregister);
167
168static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
169 int plen,
170 const struct net_device *dev,
171 u32 flags, u32 noflags,
172 bool no_gw);
173
174static void addrconf_dad_start(struct inet6_ifaddr *ifp);
175static void addrconf_dad_work(struct work_struct *w);
176static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
177 bool send_na);
178static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
179static void addrconf_rs_timer(struct timer_list *t);
180static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
181static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182
183static void inet6_prefix_notify(int event, struct inet6_dev *idev,
184 struct prefix_info *pinfo);
185
186static struct ipv6_devconf ipv6_devconf __read_mostly = {
187 .forwarding = 0,
188 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
189 .mtu6 = IPV6_MIN_MTU,
190 .accept_ra = 1,
191 .accept_redirects = 1,
192 .autoconf = 1,
193 .force_mld_version = 0,
194 .mldv1_unsolicited_report_interval = 10 * HZ,
195 .mldv2_unsolicited_report_interval = HZ,
196 .dad_transmits = 1,
197 .rtr_solicits = MAX_RTR_SOLICITATIONS,
198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
199 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201 .use_tempaddr = 0,
202 .temp_valid_lft = TEMP_VALID_LIFETIME,
203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
204 .regen_max_retry = REGEN_MAX_RETRY,
205 .max_desync_factor = MAX_DESYNC_FACTOR,
206 .max_addresses = IPV6_MAX_ADDRESSES,
207 .accept_ra_defrtr = 1,
208 .accept_ra_from_local = 0,
209 .accept_ra_min_hop_limit= 1,
210 .accept_ra_pinfo = 1,
211#ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
213 .rtr_probe_interval = 60 * HZ,
214#ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_min_plen = 0,
216 .accept_ra_rt_info_max_plen = 0,
217#endif
218#endif
219 .proxy_ndp = 0,
220 .accept_source_route = 0, /* we do not accept RH0 by default. */
221 .disable_ipv6 = 0,
222 .accept_dad = 0,
223 .suppress_frag_ndisc = 1,
224 .accept_ra_mtu = 1,
225 .stable_secret = {
226 .initialized = false,
227 },
228 .use_oif_addrs_only = 0,
229 .ignore_routes_with_linkdown = 0,
230 .keep_addr_on_down = 0,
231 .seg6_enabled = 0,
232#ifdef CONFIG_IPV6_SEG6_HMAC
233 .seg6_require_hmac = 0,
234#endif
235 .enhanced_dad = 1,
236 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
237 .disable_policy = 0,
238 .rpl_seg_enabled = 0,
239};
240
241static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
242 .forwarding = 0,
243 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
244 .mtu6 = IPV6_MIN_MTU,
245 .accept_ra = 1,
246 .accept_redirects = 1,
247 .autoconf = 1,
248 .force_mld_version = 0,
249 .mldv1_unsolicited_report_interval = 10 * HZ,
250 .mldv2_unsolicited_report_interval = HZ,
251 .dad_transmits = 1,
252 .rtr_solicits = MAX_RTR_SOLICITATIONS,
253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
256 .use_tempaddr = 0,
257 .temp_valid_lft = TEMP_VALID_LIFETIME,
258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
259 .regen_max_retry = REGEN_MAX_RETRY,
260 .max_desync_factor = MAX_DESYNC_FACTOR,
261 .max_addresses = IPV6_MAX_ADDRESSES,
262 .accept_ra_defrtr = 1,
263 .accept_ra_from_local = 0,
264 .accept_ra_min_hop_limit= 1,
265 .accept_ra_pinfo = 1,
266#ifdef CONFIG_IPV6_ROUTER_PREF
267 .accept_ra_rtr_pref = 1,
268 .rtr_probe_interval = 60 * HZ,
269#ifdef CONFIG_IPV6_ROUTE_INFO
270 .accept_ra_rt_info_min_plen = 0,
271 .accept_ra_rt_info_max_plen = 0,
272#endif
273#endif
274 .proxy_ndp = 0,
275 .accept_source_route = 0, /* we do not accept RH0 by default. */
276 .disable_ipv6 = 0,
277 .accept_dad = 1,
278 .suppress_frag_ndisc = 1,
279 .accept_ra_mtu = 1,
280 .stable_secret = {
281 .initialized = false,
282 },
283 .use_oif_addrs_only = 0,
284 .ignore_routes_with_linkdown = 0,
285 .keep_addr_on_down = 0,
286 .seg6_enabled = 0,
287#ifdef CONFIG_IPV6_SEG6_HMAC
288 .seg6_require_hmac = 0,
289#endif
290 .enhanced_dad = 1,
291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
292 .disable_policy = 0,
293 .rpl_seg_enabled = 0,
294};
295
296/* Check if link is ready: is it up and is a valid qdisc available */
297static inline bool addrconf_link_ready(const struct net_device *dev)
298{
299 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
300}
301
302static void addrconf_del_rs_timer(struct inet6_dev *idev)
303{
304 if (del_timer(&idev->rs_timer))
305 __in6_dev_put(idev);
306}
307
308static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
309{
310 if (cancel_delayed_work(&ifp->dad_work))
311 __in6_ifa_put(ifp);
312}
313
314static void addrconf_mod_rs_timer(struct inet6_dev *idev,
315 unsigned long when)
316{
317 if (!timer_pending(&idev->rs_timer))
318 in6_dev_hold(idev);
319 mod_timer(&idev->rs_timer, jiffies + when);
320}
321
322static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
323 unsigned long delay)
324{
325 in6_ifa_hold(ifp);
326 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
327 in6_ifa_put(ifp);
328}
329
330static int snmp6_alloc_dev(struct inet6_dev *idev)
331{
332 int i;
333
334 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
335 if (!idev->stats.ipv6)
336 goto err_ip;
337
338 for_each_possible_cpu(i) {
339 struct ipstats_mib *addrconf_stats;
340 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
341 u64_stats_init(&addrconf_stats->syncp);
342 }
343
344
345 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
346 GFP_KERNEL);
347 if (!idev->stats.icmpv6dev)
348 goto err_icmp;
349 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
350 GFP_KERNEL);
351 if (!idev->stats.icmpv6msgdev)
352 goto err_icmpmsg;
353
354 return 0;
355
356err_icmpmsg:
357 kfree(idev->stats.icmpv6dev);
358err_icmp:
359 free_percpu(idev->stats.ipv6);
360err_ip:
361 return -ENOMEM;
362}
363
364static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
365{
366 struct inet6_dev *ndev;
367 int err = -ENOMEM;
368
369 ASSERT_RTNL();
370
371 if (dev->mtu < IPV6_MIN_MTU)
372 return ERR_PTR(-EINVAL);
373
374 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
375 if (!ndev)
376 return ERR_PTR(err);
377
378 rwlock_init(&ndev->lock);
379 ndev->dev = dev;
380 INIT_LIST_HEAD(&ndev->addr_list);
381 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
382 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
383
384 if (ndev->cnf.stable_secret.initialized)
385 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
386
387 ndev->cnf.mtu6 = dev->mtu;
388 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
389 if (!ndev->nd_parms) {
390 kfree(ndev);
391 return ERR_PTR(err);
392 }
393 if (ndev->cnf.forwarding)
394 dev_disable_lro(dev);
395 /* We refer to the device */
396 dev_hold(dev);
397
398 if (snmp6_alloc_dev(ndev) < 0) {
399 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
400 __func__);
401 neigh_parms_release(&nd_tbl, ndev->nd_parms);
402 dev_put(dev);
403 kfree(ndev);
404 return ERR_PTR(err);
405 }
406
407 if (snmp6_register_dev(ndev) < 0) {
408 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
409 __func__, dev->name);
410 goto err_release;
411 }
412
413 /* One reference from device. */
414 refcount_set(&ndev->refcnt, 1);
415
416 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
417 ndev->cnf.accept_dad = -1;
418
419#if IS_ENABLED(CONFIG_IPV6_SIT)
420 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
421 pr_info("%s: Disabled Multicast RS\n", dev->name);
422 ndev->cnf.rtr_solicits = 0;
423 }
424#endif
425
426 INIT_LIST_HEAD(&ndev->tempaddr_list);
427 ndev->desync_factor = U32_MAX;
428 if ((dev->flags&IFF_LOOPBACK) ||
429 dev->type == ARPHRD_TUNNEL ||
430 dev->type == ARPHRD_TUNNEL6 ||
431 dev->type == ARPHRD_SIT ||
432 dev->type == ARPHRD_NONE) {
433 ndev->cnf.use_tempaddr = -1;
434 }
435
436 ndev->token = in6addr_any;
437
438 if (netif_running(dev) && addrconf_link_ready(dev))
439 ndev->if_flags |= IF_READY;
440
441 ipv6_mc_init_dev(ndev);
442 ndev->tstamp = jiffies;
443 err = addrconf_sysctl_register(ndev);
444 if (err) {
445 ipv6_mc_destroy_dev(ndev);
446 snmp6_unregister_dev(ndev);
447 goto err_release;
448 }
449 /* protected by rtnl_lock */
450 rcu_assign_pointer(dev->ip6_ptr, ndev);
451
452 /* Join interface-local all-node multicast group */
453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
454
455 /* Join all-node multicast group */
456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
457
458 /* Join all-router multicast group if forwarding is set */
459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
461
462 return ndev;
463
464err_release:
465 neigh_parms_release(&nd_tbl, ndev->nd_parms);
466 ndev->dead = 1;
467 in6_dev_finish_destroy(ndev);
468 return ERR_PTR(err);
469}
470
471static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
472{
473 struct inet6_dev *idev;
474
475 ASSERT_RTNL();
476
477 idev = __in6_dev_get(dev);
478 if (!idev) {
479 idev = ipv6_add_dev(dev);
480 if (IS_ERR(idev))
481 return idev;
482 }
483
484 if (dev->flags&IFF_UP)
485 ipv6_mc_up(idev);
486 return idev;
487}
488
489static int inet6_netconf_msgsize_devconf(int type)
490{
491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
492 + nla_total_size(4); /* NETCONFA_IFINDEX */
493 bool all = false;
494
495 if (type == NETCONFA_ALL)
496 all = true;
497
498 if (all || type == NETCONFA_FORWARDING)
499 size += nla_total_size(4);
500#ifdef CONFIG_IPV6_MROUTE
501 if (all || type == NETCONFA_MC_FORWARDING)
502 size += nla_total_size(4);
503#endif
504 if (all || type == NETCONFA_PROXY_NEIGH)
505 size += nla_total_size(4);
506
507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
508 size += nla_total_size(4);
509
510 return size;
511}
512
513static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
514 struct ipv6_devconf *devconf, u32 portid,
515 u32 seq, int event, unsigned int flags,
516 int type)
517{
518 struct nlmsghdr *nlh;
519 struct netconfmsg *ncm;
520 bool all = false;
521
522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
523 flags);
524 if (!nlh)
525 return -EMSGSIZE;
526
527 if (type == NETCONFA_ALL)
528 all = true;
529
530 ncm = nlmsg_data(nlh);
531 ncm->ncm_family = AF_INET6;
532
533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
534 goto nla_put_failure;
535
536 if (!devconf)
537 goto out;
538
539 if ((all || type == NETCONFA_FORWARDING) &&
540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
541 goto nla_put_failure;
542#ifdef CONFIG_IPV6_MROUTE
543 if ((all || type == NETCONFA_MC_FORWARDING) &&
544 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
545 devconf->mc_forwarding) < 0)
546 goto nla_put_failure;
547#endif
548 if ((all || type == NETCONFA_PROXY_NEIGH) &&
549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
550 goto nla_put_failure;
551
552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
554 devconf->ignore_routes_with_linkdown) < 0)
555 goto nla_put_failure;
556
557out:
558 nlmsg_end(skb, nlh);
559 return 0;
560
561nla_put_failure:
562 nlmsg_cancel(skb, nlh);
563 return -EMSGSIZE;
564}
565
566void inet6_netconf_notify_devconf(struct net *net, int event, int type,
567 int ifindex, struct ipv6_devconf *devconf)
568{
569 struct sk_buff *skb;
570 int err = -ENOBUFS;
571
572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
573 if (!skb)
574 goto errout;
575
576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
577 event, 0, type);
578 if (err < 0) {
579 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
580 WARN_ON(err == -EMSGSIZE);
581 kfree_skb(skb);
582 goto errout;
583 }
584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
585 return;
586errout:
587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
588}
589
590static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
591 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
592 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
595};
596
597static int inet6_netconf_valid_get_req(struct sk_buff *skb,
598 const struct nlmsghdr *nlh,
599 struct nlattr **tb,
600 struct netlink_ext_ack *extack)
601{
602 int i, err;
603
604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
606 return -EINVAL;
607 }
608
609 if (!netlink_strict_get_check(skb))
610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
611 tb, NETCONFA_MAX,
612 devconf_ipv6_policy, extack);
613
614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
615 tb, NETCONFA_MAX,
616 devconf_ipv6_policy, extack);
617 if (err)
618 return err;
619
620 for (i = 0; i <= NETCONFA_MAX; i++) {
621 if (!tb[i])
622 continue;
623
624 switch (i) {
625 case NETCONFA_IFINDEX:
626 break;
627 default:
628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
629 return -EINVAL;
630 }
631 }
632
633 return 0;
634}
635
636static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
637 struct nlmsghdr *nlh,
638 struct netlink_ext_ack *extack)
639{
640 struct net *net = sock_net(in_skb->sk);
641 struct nlattr *tb[NETCONFA_MAX+1];
642 struct inet6_dev *in6_dev = NULL;
643 struct net_device *dev = NULL;
644 struct sk_buff *skb;
645 struct ipv6_devconf *devconf;
646 int ifindex;
647 int err;
648
649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
650 if (err < 0)
651 return err;
652
653 if (!tb[NETCONFA_IFINDEX])
654 return -EINVAL;
655
656 err = -EINVAL;
657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
658 switch (ifindex) {
659 case NETCONFA_IFINDEX_ALL:
660 devconf = net->ipv6.devconf_all;
661 break;
662 case NETCONFA_IFINDEX_DEFAULT:
663 devconf = net->ipv6.devconf_dflt;
664 break;
665 default:
666 dev = dev_get_by_index(net, ifindex);
667 if (!dev)
668 return -EINVAL;
669 in6_dev = in6_dev_get(dev);
670 if (!in6_dev)
671 goto errout;
672 devconf = &in6_dev->cnf;
673 break;
674 }
675
676 err = -ENOBUFS;
677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
678 if (!skb)
679 goto errout;
680
681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
682 NETLINK_CB(in_skb).portid,
683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
684 NETCONFA_ALL);
685 if (err < 0) {
686 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
687 WARN_ON(err == -EMSGSIZE);
688 kfree_skb(skb);
689 goto errout;
690 }
691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
692errout:
693 if (in6_dev)
694 in6_dev_put(in6_dev);
695 if (dev)
696 dev_put(dev);
697 return err;
698}
699
700static int inet6_netconf_dump_devconf(struct sk_buff *skb,
701 struct netlink_callback *cb)
702{
703 const struct nlmsghdr *nlh = cb->nlh;
704 struct net *net = sock_net(skb->sk);
705 int h, s_h;
706 int idx, s_idx;
707 struct net_device *dev;
708 struct inet6_dev *idev;
709 struct hlist_head *head;
710
711 if (cb->strict_check) {
712 struct netlink_ext_ack *extack = cb->extack;
713 struct netconfmsg *ncm;
714
715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
717 return -EINVAL;
718 }
719
720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
722 return -EINVAL;
723 }
724 }
725
726 s_h = cb->args[0];
727 s_idx = idx = cb->args[1];
728
729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
730 idx = 0;
731 head = &net->dev_index_head[h];
732 rcu_read_lock();
733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
734 net->dev_base_seq;
735 hlist_for_each_entry_rcu(dev, head, index_hlist) {
736 if (idx < s_idx)
737 goto cont;
738 idev = __in6_dev_get(dev);
739 if (!idev)
740 goto cont;
741
742 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
743 &idev->cnf,
744 NETLINK_CB(cb->skb).portid,
745 nlh->nlmsg_seq,
746 RTM_NEWNETCONF,
747 NLM_F_MULTI,
748 NETCONFA_ALL) < 0) {
749 rcu_read_unlock();
750 goto done;
751 }
752 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
753cont:
754 idx++;
755 }
756 rcu_read_unlock();
757 }
758 if (h == NETDEV_HASHENTRIES) {
759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
760 net->ipv6.devconf_all,
761 NETLINK_CB(cb->skb).portid,
762 nlh->nlmsg_seq,
763 RTM_NEWNETCONF, NLM_F_MULTI,
764 NETCONFA_ALL) < 0)
765 goto done;
766 else
767 h++;
768 }
769 if (h == NETDEV_HASHENTRIES + 1) {
770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
771 net->ipv6.devconf_dflt,
772 NETLINK_CB(cb->skb).portid,
773 nlh->nlmsg_seq,
774 RTM_NEWNETCONF, NLM_F_MULTI,
775 NETCONFA_ALL) < 0)
776 goto done;
777 else
778 h++;
779 }
780done:
781 cb->args[0] = h;
782 cb->args[1] = idx;
783
784 return skb->len;
785}
786
787#ifdef CONFIG_SYSCTL
788static void dev_forward_change(struct inet6_dev *idev)
789{
790 struct net_device *dev;
791 struct inet6_ifaddr *ifa;
792
793 if (!idev)
794 return;
795 dev = idev->dev;
796 if (idev->cnf.forwarding)
797 dev_disable_lro(dev);
798 if (dev->flags & IFF_MULTICAST) {
799 if (idev->cnf.forwarding) {
800 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
801 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
802 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
803 } else {
804 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
805 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
806 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
807 }
808 }
809
810 list_for_each_entry(ifa, &idev->addr_list, if_list) {
811 if (ifa->flags&IFA_F_TENTATIVE)
812 continue;
813 if (idev->cnf.forwarding)
814 addrconf_join_anycast(ifa);
815 else
816 addrconf_leave_anycast(ifa);
817 }
818 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
819 NETCONFA_FORWARDING,
820 dev->ifindex, &idev->cnf);
821}
822
823
824static void addrconf_forward_change(struct net *net, __s32 newf)
825{
826 struct net_device *dev;
827 struct inet6_dev *idev;
828
829 for_each_netdev(net, dev) {
830 idev = __in6_dev_get(dev);
831 if (idev) {
832 int changed = (!idev->cnf.forwarding) ^ (!newf);
833 idev->cnf.forwarding = newf;
834 if (changed)
835 dev_forward_change(idev);
836 }
837 }
838}
839
840static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
841{
842 struct net *net;
843 int old;
844
845 if (!rtnl_trylock())
846 return restart_syscall();
847
848 net = (struct net *)table->extra2;
849 old = *p;
850 *p = newf;
851
852 if (p == &net->ipv6.devconf_dflt->forwarding) {
853 if ((!newf) ^ (!old))
854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
855 NETCONFA_FORWARDING,
856 NETCONFA_IFINDEX_DEFAULT,
857 net->ipv6.devconf_dflt);
858 rtnl_unlock();
859 return 0;
860 }
861
862 if (p == &net->ipv6.devconf_all->forwarding) {
863 int old_dflt = net->ipv6.devconf_dflt->forwarding;
864
865 net->ipv6.devconf_dflt->forwarding = newf;
866 if ((!newf) ^ (!old_dflt))
867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
868 NETCONFA_FORWARDING,
869 NETCONFA_IFINDEX_DEFAULT,
870 net->ipv6.devconf_dflt);
871
872 addrconf_forward_change(net, newf);
873 if ((!newf) ^ (!old))
874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
875 NETCONFA_FORWARDING,
876 NETCONFA_IFINDEX_ALL,
877 net->ipv6.devconf_all);
878 } else if ((!newf) ^ (!old))
879 dev_forward_change((struct inet6_dev *)table->extra1);
880 rtnl_unlock();
881
882 if (newf)
883 rt6_purge_dflt_routers(net);
884 return 1;
885}
886
887static void addrconf_linkdown_change(struct net *net, __s32 newf)
888{
889 struct net_device *dev;
890 struct inet6_dev *idev;
891
892 for_each_netdev(net, dev) {
893 idev = __in6_dev_get(dev);
894 if (idev) {
895 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
896
897 idev->cnf.ignore_routes_with_linkdown = newf;
898 if (changed)
899 inet6_netconf_notify_devconf(dev_net(dev),
900 RTM_NEWNETCONF,
901 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
902 dev->ifindex,
903 &idev->cnf);
904 }
905 }
906}
907
908static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
909{
910 struct net *net;
911 int old;
912
913 if (!rtnl_trylock())
914 return restart_syscall();
915
916 net = (struct net *)table->extra2;
917 old = *p;
918 *p = newf;
919
920 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
921 if ((!newf) ^ (!old))
922 inet6_netconf_notify_devconf(net,
923 RTM_NEWNETCONF,
924 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
925 NETCONFA_IFINDEX_DEFAULT,
926 net->ipv6.devconf_dflt);
927 rtnl_unlock();
928 return 0;
929 }
930
931 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
932 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
933 addrconf_linkdown_change(net, newf);
934 if ((!newf) ^ (!old))
935 inet6_netconf_notify_devconf(net,
936 RTM_NEWNETCONF,
937 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
938 NETCONFA_IFINDEX_ALL,
939 net->ipv6.devconf_all);
940 }
941 rtnl_unlock();
942
943 return 1;
944}
945
946#endif
947
948/* Nobody refers to this ifaddr, destroy it */
949void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
950{
951 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
952
953#ifdef NET_REFCNT_DEBUG
954 pr_debug("%s\n", __func__);
955#endif
956
957 in6_dev_put(ifp->idev);
958
959 if (cancel_delayed_work(&ifp->dad_work))
960 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
961 ifp);
962
963 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
964 pr_warn("Freeing alive inet6 address %p\n", ifp);
965 return;
966 }
967
968 kfree_rcu(ifp, rcu);
969}
970
971static void
972ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
973{
974 struct list_head *p;
975 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
976
977 /*
978 * Each device address list is sorted in order of scope -
979 * global before linklocal.
980 */
981 list_for_each(p, &idev->addr_list) {
982 struct inet6_ifaddr *ifa
983 = list_entry(p, struct inet6_ifaddr, if_list);
984 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
985 break;
986 }
987
988 list_add_tail_rcu(&ifp->if_list, p);
989}
990
991static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
992{
993 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
994
995 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
996}
997
998static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
999 struct net_device *dev, unsigned int hash)
1000{
1001 struct inet6_ifaddr *ifp;
1002
1003 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1004 if (!net_eq(dev_net(ifp->idev->dev), net))
1005 continue;
1006 if (ipv6_addr_equal(&ifp->addr, addr)) {
1007 if (!dev || ifp->idev->dev == dev)
1008 return true;
1009 }
1010 }
1011 return false;
1012}
1013
1014static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1015{
1016 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1017 int err = 0;
1018
1019 spin_lock(&addrconf_hash_lock);
1020
1021 /* Ignore adding duplicate addresses on an interface */
1022 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1023 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1024 err = -EEXIST;
1025 } else {
1026 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1027 }
1028
1029 spin_unlock(&addrconf_hash_lock);
1030
1031 return err;
1032}
1033
1034/* On success it returns ifp with increased reference count */
1035
1036static struct inet6_ifaddr *
1037ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1038 bool can_block, struct netlink_ext_ack *extack)
1039{
1040 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1041 int addr_type = ipv6_addr_type(cfg->pfx);
1042 struct net *net = dev_net(idev->dev);
1043 struct inet6_ifaddr *ifa = NULL;
1044 struct fib6_info *f6i = NULL;
1045 int err = 0;
1046
1047 if (addr_type == IPV6_ADDR_ANY ||
1048 (addr_type & IPV6_ADDR_MULTICAST &&
1049 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1050 (!(idev->dev->flags & IFF_LOOPBACK) &&
1051 !netif_is_l3_master(idev->dev) &&
1052 addr_type & IPV6_ADDR_LOOPBACK))
1053 return ERR_PTR(-EADDRNOTAVAIL);
1054
1055 if (idev->dead) {
1056 err = -ENODEV; /*XXX*/
1057 goto out;
1058 }
1059
1060 if (idev->cnf.disable_ipv6) {
1061 err = -EACCES;
1062 goto out;
1063 }
1064
1065 /* validator notifier needs to be blocking;
1066 * do not call in atomic context
1067 */
1068 if (can_block) {
1069 struct in6_validator_info i6vi = {
1070 .i6vi_addr = *cfg->pfx,
1071 .i6vi_dev = idev,
1072 .extack = extack,
1073 };
1074
1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1076 err = notifier_to_errno(err);
1077 if (err < 0)
1078 goto out;
1079 }
1080
1081 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1082 if (!ifa) {
1083 err = -ENOBUFS;
1084 goto out;
1085 }
1086
1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1088 if (IS_ERR(f6i)) {
1089 err = PTR_ERR(f6i);
1090 f6i = NULL;
1091 goto out;
1092 }
1093
1094 if (net->ipv6.devconf_all->disable_policy ||
1095 idev->cnf.disable_policy)
1096 f6i->dst_nopolicy = true;
1097
1098 neigh_parms_data_state_setall(idev->nd_parms);
1099
1100 ifa->addr = *cfg->pfx;
1101 if (cfg->peer_pfx)
1102 ifa->peer_addr = *cfg->peer_pfx;
1103
1104 spin_lock_init(&ifa->lock);
1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1106 INIT_HLIST_NODE(&ifa->addr_lst);
1107 ifa->scope = cfg->scope;
1108 ifa->prefix_len = cfg->plen;
1109 ifa->rt_priority = cfg->rt_priority;
1110 ifa->flags = cfg->ifa_flags;
1111 /* No need to add the TENTATIVE flag for addresses with NODAD */
1112 if (!(cfg->ifa_flags & IFA_F_NODAD))
1113 ifa->flags |= IFA_F_TENTATIVE;
1114 ifa->valid_lft = cfg->valid_lft;
1115 ifa->prefered_lft = cfg->preferred_lft;
1116 ifa->cstamp = ifa->tstamp = jiffies;
1117 ifa->tokenized = false;
1118
1119 ifa->rt = f6i;
1120
1121 ifa->idev = idev;
1122 in6_dev_hold(idev);
1123
1124 /* For caller */
1125 refcount_set(&ifa->refcnt, 1);
1126
1127 rcu_read_lock_bh();
1128
1129 err = ipv6_add_addr_hash(idev->dev, ifa);
1130 if (err < 0) {
1131 rcu_read_unlock_bh();
1132 goto out;
1133 }
1134
1135 write_lock(&idev->lock);
1136
1137 /* Add to inet6_dev unicast addr list. */
1138 ipv6_link_dev_addr(idev, ifa);
1139
1140 if (ifa->flags&IFA_F_TEMPORARY) {
1141 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1142 in6_ifa_hold(ifa);
1143 }
1144
1145 in6_ifa_hold(ifa);
1146 write_unlock(&idev->lock);
1147
1148 rcu_read_unlock_bh();
1149
1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1151out:
1152 if (unlikely(err < 0)) {
1153 fib6_info_release(f6i);
1154
1155 if (ifa) {
1156 if (ifa->idev)
1157 in6_dev_put(ifa->idev);
1158 kfree(ifa);
1159 }
1160 ifa = ERR_PTR(err);
1161 }
1162
1163 return ifa;
1164}
1165
1166enum cleanup_prefix_rt_t {
1167 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1168 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1169 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1170};
1171
1172/*
1173 * Check, whether the prefix for ifp would still need a prefix route
1174 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1175 * constants.
1176 *
1177 * 1) we don't purge prefix if address was not permanent.
1178 * prefix is managed by its own lifetime.
1179 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1180 * 3) if there are no addresses, delete prefix.
1181 * 4) if there are still other permanent address(es),
1182 * corresponding prefix is still permanent.
1183 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1184 * don't purge the prefix, assume user space is managing it.
1185 * 6) otherwise, update prefix lifetime to the
1186 * longest valid lifetime among the corresponding
1187 * addresses on the device.
1188 * Note: subsequent RA will update lifetime.
1189 **/
1190static enum cleanup_prefix_rt_t
1191check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1192{
1193 struct inet6_ifaddr *ifa;
1194 struct inet6_dev *idev = ifp->idev;
1195 unsigned long lifetime;
1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1197
1198 *expires = jiffies;
1199
1200 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1201 if (ifa == ifp)
1202 continue;
1203 if (ifa->prefix_len != ifp->prefix_len ||
1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1205 ifp->prefix_len))
1206 continue;
1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1208 return CLEANUP_PREFIX_RT_NOP;
1209
1210 action = CLEANUP_PREFIX_RT_EXPIRE;
1211
1212 spin_lock(&ifa->lock);
1213
1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1215 /*
1216 * Note: Because this address is
1217 * not permanent, lifetime <
1218 * LONG_MAX / HZ here.
1219 */
1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1221 *expires = ifa->tstamp + lifetime * HZ;
1222 spin_unlock(&ifa->lock);
1223 }
1224
1225 return action;
1226}
1227
1228static void
1229cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1230 bool del_rt, bool del_peer)
1231{
1232 struct fib6_info *f6i;
1233
1234 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1235 ifp->prefix_len,
1236 ifp->idev->dev, 0, RTF_DEFAULT, true);
1237 if (f6i) {
1238 if (del_rt)
1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1240 else {
1241 if (!(f6i->fib6_flags & RTF_EXPIRES))
1242 fib6_set_expires(f6i, expires);
1243 fib6_info_release(f6i);
1244 }
1245 }
1246}
1247
1248
1249/* This function wants to get referenced ifp and releases it before return */
1250
1251static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1252{
1253 int state;
1254 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1255 unsigned long expires;
1256
1257 ASSERT_RTNL();
1258
1259 spin_lock_bh(&ifp->lock);
1260 state = ifp->state;
1261 ifp->state = INET6_IFADDR_STATE_DEAD;
1262 spin_unlock_bh(&ifp->lock);
1263
1264 if (state == INET6_IFADDR_STATE_DEAD)
1265 goto out;
1266
1267 spin_lock_bh(&addrconf_hash_lock);
1268 hlist_del_init_rcu(&ifp->addr_lst);
1269 spin_unlock_bh(&addrconf_hash_lock);
1270
1271 write_lock_bh(&ifp->idev->lock);
1272
1273 if (ifp->flags&IFA_F_TEMPORARY) {
1274 list_del(&ifp->tmp_list);
1275 if (ifp->ifpub) {
1276 in6_ifa_put(ifp->ifpub);
1277 ifp->ifpub = NULL;
1278 }
1279 __in6_ifa_put(ifp);
1280 }
1281
1282 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1283 action = check_cleanup_prefix_route(ifp, &expires);
1284
1285 list_del_rcu(&ifp->if_list);
1286 __in6_ifa_put(ifp);
1287
1288 write_unlock_bh(&ifp->idev->lock);
1289
1290 addrconf_del_dad_work(ifp);
1291
1292 ipv6_ifa_notify(RTM_DELADDR, ifp);
1293
1294 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1295
1296 if (action != CLEANUP_PREFIX_RT_NOP) {
1297 cleanup_prefix_route(ifp, expires,
1298 action == CLEANUP_PREFIX_RT_DEL, false);
1299 }
1300
1301 /* clean up prefsrc entries */
1302 rt6_remove_prefsrc(ifp);
1303out:
1304 in6_ifa_put(ifp);
1305}
1306
1307static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1308{
1309 struct inet6_dev *idev = ifp->idev;
1310 unsigned long tmp_tstamp, age;
1311 unsigned long regen_advance;
1312 unsigned long now = jiffies;
1313 s32 cnf_temp_preferred_lft;
1314 struct inet6_ifaddr *ift;
1315 struct ifa6_config cfg;
1316 long max_desync_factor;
1317 struct in6_addr addr;
1318 int ret = 0;
1319
1320 write_lock_bh(&idev->lock);
1321
1322retry:
1323 in6_dev_hold(idev);
1324 if (idev->cnf.use_tempaddr <= 0) {
1325 write_unlock_bh(&idev->lock);
1326 pr_info("%s: use_tempaddr is disabled\n", __func__);
1327 in6_dev_put(idev);
1328 ret = -1;
1329 goto out;
1330 }
1331 spin_lock_bh(&ifp->lock);
1332 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1333 idev->cnf.use_tempaddr = -1; /*XXX*/
1334 spin_unlock_bh(&ifp->lock);
1335 write_unlock_bh(&idev->lock);
1336 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1337 __func__);
1338 in6_dev_put(idev);
1339 ret = -1;
1340 goto out;
1341 }
1342 in6_ifa_hold(ifp);
1343 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1344 ipv6_gen_rnd_iid(&addr);
1345
1346 age = (now - ifp->tstamp) / HZ;
1347
1348 regen_advance = idev->cnf.regen_max_retry *
1349 idev->cnf.dad_transmits *
1350 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1351
1352 /* recalculate max_desync_factor each time and update
1353 * idev->desync_factor if it's larger
1354 */
1355 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1356 max_desync_factor = min_t(__u32,
1357 idev->cnf.max_desync_factor,
1358 cnf_temp_preferred_lft - regen_advance);
1359
1360 if (unlikely(idev->desync_factor > max_desync_factor)) {
1361 if (max_desync_factor > 0) {
1362 get_random_bytes(&idev->desync_factor,
1363 sizeof(idev->desync_factor));
1364 idev->desync_factor %= max_desync_factor;
1365 } else {
1366 idev->desync_factor = 0;
1367 }
1368 }
1369
1370 memset(&cfg, 0, sizeof(cfg));
1371 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1372 idev->cnf.temp_valid_lft + age);
1373 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1374 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1375
1376 cfg.plen = ifp->prefix_len;
1377 tmp_tstamp = ifp->tstamp;
1378 spin_unlock_bh(&ifp->lock);
1379
1380 write_unlock_bh(&idev->lock);
1381
1382 /* A temporary address is created only if this calculated Preferred
1383 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1384 * an implementation must not create a temporary address with a zero
1385 * Preferred Lifetime.
1386 * Use age calculation as in addrconf_verify to avoid unnecessary
1387 * temporary addresses being generated.
1388 */
1389 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1390 if (cfg.preferred_lft <= regen_advance + age) {
1391 in6_ifa_put(ifp);
1392 in6_dev_put(idev);
1393 ret = -1;
1394 goto out;
1395 }
1396
1397 cfg.ifa_flags = IFA_F_TEMPORARY;
1398 /* set in addrconf_prefix_rcv() */
1399 if (ifp->flags & IFA_F_OPTIMISTIC)
1400 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1401
1402 cfg.pfx = &addr;
1403 cfg.scope = ipv6_addr_scope(cfg.pfx);
1404
1405 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1406 if (IS_ERR(ift)) {
1407 in6_ifa_put(ifp);
1408 in6_dev_put(idev);
1409 pr_info("%s: retry temporary address regeneration\n", __func__);
1410 write_lock_bh(&idev->lock);
1411 goto retry;
1412 }
1413
1414 spin_lock_bh(&ift->lock);
1415 ift->ifpub = ifp;
1416 ift->cstamp = now;
1417 ift->tstamp = tmp_tstamp;
1418 spin_unlock_bh(&ift->lock);
1419
1420 addrconf_dad_start(ift);
1421 in6_ifa_put(ift);
1422 in6_dev_put(idev);
1423out:
1424 return ret;
1425}
1426
1427/*
1428 * Choose an appropriate source address (RFC3484)
1429 */
1430enum {
1431 IPV6_SADDR_RULE_INIT = 0,
1432 IPV6_SADDR_RULE_LOCAL,
1433 IPV6_SADDR_RULE_SCOPE,
1434 IPV6_SADDR_RULE_PREFERRED,
1435#ifdef CONFIG_IPV6_MIP6
1436 IPV6_SADDR_RULE_HOA,
1437#endif
1438 IPV6_SADDR_RULE_OIF,
1439 IPV6_SADDR_RULE_LABEL,
1440 IPV6_SADDR_RULE_PRIVACY,
1441 IPV6_SADDR_RULE_ORCHID,
1442 IPV6_SADDR_RULE_PREFIX,
1443#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1444 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1445#endif
1446 IPV6_SADDR_RULE_MAX
1447};
1448
1449struct ipv6_saddr_score {
1450 int rule;
1451 int addr_type;
1452 struct inet6_ifaddr *ifa;
1453 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1454 int scopedist;
1455 int matchlen;
1456};
1457
1458struct ipv6_saddr_dst {
1459 const struct in6_addr *addr;
1460 int ifindex;
1461 int scope;
1462 int label;
1463 unsigned int prefs;
1464};
1465
1466static inline int ipv6_saddr_preferred(int type)
1467{
1468 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1469 return 1;
1470 return 0;
1471}
1472
1473static bool ipv6_use_optimistic_addr(struct net *net,
1474 struct inet6_dev *idev)
1475{
1476#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1477 if (!idev)
1478 return false;
1479 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1480 return false;
1481 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1482 return false;
1483
1484 return true;
1485#else
1486 return false;
1487#endif
1488}
1489
1490static bool ipv6_allow_optimistic_dad(struct net *net,
1491 struct inet6_dev *idev)
1492{
1493#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1494 if (!idev)
1495 return false;
1496 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1497 return false;
1498
1499 return true;
1500#else
1501 return false;
1502#endif
1503}
1504
1505static int ipv6_get_saddr_eval(struct net *net,
1506 struct ipv6_saddr_score *score,
1507 struct ipv6_saddr_dst *dst,
1508 int i)
1509{
1510 int ret;
1511
1512 if (i <= score->rule) {
1513 switch (i) {
1514 case IPV6_SADDR_RULE_SCOPE:
1515 ret = score->scopedist;
1516 break;
1517 case IPV6_SADDR_RULE_PREFIX:
1518 ret = score->matchlen;
1519 break;
1520 default:
1521 ret = !!test_bit(i, score->scorebits);
1522 }
1523 goto out;
1524 }
1525
1526 switch (i) {
1527 case IPV6_SADDR_RULE_INIT:
1528 /* Rule 0: remember if hiscore is not ready yet */
1529 ret = !!score->ifa;
1530 break;
1531 case IPV6_SADDR_RULE_LOCAL:
1532 /* Rule 1: Prefer same address */
1533 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1534 break;
1535 case IPV6_SADDR_RULE_SCOPE:
1536 /* Rule 2: Prefer appropriate scope
1537 *
1538 * ret
1539 * ^
1540 * -1 | d 15
1541 * ---+--+-+---> scope
1542 * |
1543 * | d is scope of the destination.
1544 * B-d | \
1545 * | \ <- smaller scope is better if
1546 * B-15 | \ if scope is enough for destination.
1547 * | ret = B - scope (-1 <= scope >= d <= 15).
1548 * d-C-1 | /
1549 * |/ <- greater is better
1550 * -C / if scope is not enough for destination.
1551 * /| ret = scope - C (-1 <= d < scope <= 15).
1552 *
1553 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1554 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1555 * Assume B = 0 and we get C > 29.
1556 */
1557 ret = __ipv6_addr_src_scope(score->addr_type);
1558 if (ret >= dst->scope)
1559 ret = -ret;
1560 else
1561 ret -= 128; /* 30 is enough */
1562 score->scopedist = ret;
1563 break;
1564 case IPV6_SADDR_RULE_PREFERRED:
1565 {
1566 /* Rule 3: Avoid deprecated and optimistic addresses */
1567 u8 avoid = IFA_F_DEPRECATED;
1568
1569 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1570 avoid |= IFA_F_OPTIMISTIC;
1571 ret = ipv6_saddr_preferred(score->addr_type) ||
1572 !(score->ifa->flags & avoid);
1573 break;
1574 }
1575#ifdef CONFIG_IPV6_MIP6
1576 case IPV6_SADDR_RULE_HOA:
1577 {
1578 /* Rule 4: Prefer home address */
1579 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1580 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1581 break;
1582 }
1583#endif
1584 case IPV6_SADDR_RULE_OIF:
1585 /* Rule 5: Prefer outgoing interface */
1586 ret = (!dst->ifindex ||
1587 dst->ifindex == score->ifa->idev->dev->ifindex);
1588 break;
1589 case IPV6_SADDR_RULE_LABEL:
1590 /* Rule 6: Prefer matching label */
1591 ret = ipv6_addr_label(net,
1592 &score->ifa->addr, score->addr_type,
1593 score->ifa->idev->dev->ifindex) == dst->label;
1594 break;
1595 case IPV6_SADDR_RULE_PRIVACY:
1596 {
1597 /* Rule 7: Prefer public address
1598 * Note: prefer temporary address if use_tempaddr >= 2
1599 */
1600 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1601 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1602 score->ifa->idev->cnf.use_tempaddr >= 2;
1603 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1604 break;
1605 }
1606 case IPV6_SADDR_RULE_ORCHID:
1607 /* Rule 8-: Prefer ORCHID vs ORCHID or
1608 * non-ORCHID vs non-ORCHID
1609 */
1610 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1611 ipv6_addr_orchid(dst->addr));
1612 break;
1613 case IPV6_SADDR_RULE_PREFIX:
1614 /* Rule 8: Use longest matching prefix */
1615 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1616 if (ret > score->ifa->prefix_len)
1617 ret = score->ifa->prefix_len;
1618 score->matchlen = ret;
1619 break;
1620#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1621 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1622 /* Optimistic addresses still have lower precedence than other
1623 * preferred addresses.
1624 */
1625 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1626 break;
1627#endif
1628 default:
1629 ret = 0;
1630 }
1631
1632 if (ret)
1633 __set_bit(i, score->scorebits);
1634 score->rule = i;
1635out:
1636 return ret;
1637}
1638
1639static int __ipv6_dev_get_saddr(struct net *net,
1640 struct ipv6_saddr_dst *dst,
1641 struct inet6_dev *idev,
1642 struct ipv6_saddr_score *scores,
1643 int hiscore_idx)
1644{
1645 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1646
1647 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1648 int i;
1649
1650 /*
1651 * - Tentative Address (RFC2462 section 5.4)
1652 * - A tentative address is not considered
1653 * "assigned to an interface" in the traditional
1654 * sense, unless it is also flagged as optimistic.
1655 * - Candidate Source Address (section 4)
1656 * - In any case, anycast addresses, multicast
1657 * addresses, and the unspecified address MUST
1658 * NOT be included in a candidate set.
1659 */
1660 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1661 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1662 continue;
1663
1664 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1665
1666 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1667 score->addr_type & IPV6_ADDR_MULTICAST)) {
1668 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1669 idev->dev->name);
1670 continue;
1671 }
1672
1673 score->rule = -1;
1674 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1675
1676 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1677 int minihiscore, miniscore;
1678
1679 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1680 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1681
1682 if (minihiscore > miniscore) {
1683 if (i == IPV6_SADDR_RULE_SCOPE &&
1684 score->scopedist > 0) {
1685 /*
1686 * special case:
1687 * each remaining entry
1688 * has too small (not enough)
1689 * scope, because ifa entries
1690 * are sorted by their scope
1691 * values.
1692 */
1693 goto out;
1694 }
1695 break;
1696 } else if (minihiscore < miniscore) {
1697 swap(hiscore, score);
1698 hiscore_idx = 1 - hiscore_idx;
1699
1700 /* restore our iterator */
1701 score->ifa = hiscore->ifa;
1702
1703 break;
1704 }
1705 }
1706 }
1707out:
1708 return hiscore_idx;
1709}
1710
1711static int ipv6_get_saddr_master(struct net *net,
1712 const struct net_device *dst_dev,
1713 const struct net_device *master,
1714 struct ipv6_saddr_dst *dst,
1715 struct ipv6_saddr_score *scores,
1716 int hiscore_idx)
1717{
1718 struct inet6_dev *idev;
1719
1720 idev = __in6_dev_get(dst_dev);
1721 if (idev)
1722 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1723 scores, hiscore_idx);
1724
1725 idev = __in6_dev_get(master);
1726 if (idev)
1727 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1728 scores, hiscore_idx);
1729
1730 return hiscore_idx;
1731}
1732
1733int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1734 const struct in6_addr *daddr, unsigned int prefs,
1735 struct in6_addr *saddr)
1736{
1737 struct ipv6_saddr_score scores[2], *hiscore;
1738 struct ipv6_saddr_dst dst;
1739 struct inet6_dev *idev;
1740 struct net_device *dev;
1741 int dst_type;
1742 bool use_oif_addr = false;
1743 int hiscore_idx = 0;
1744 int ret = 0;
1745
1746 dst_type = __ipv6_addr_type(daddr);
1747 dst.addr = daddr;
1748 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1749 dst.scope = __ipv6_addr_src_scope(dst_type);
1750 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1751 dst.prefs = prefs;
1752
1753 scores[hiscore_idx].rule = -1;
1754 scores[hiscore_idx].ifa = NULL;
1755
1756 rcu_read_lock();
1757
1758 /* Candidate Source Address (section 4)
1759 * - multicast and link-local destination address,
1760 * the set of candidate source address MUST only
1761 * include addresses assigned to interfaces
1762 * belonging to the same link as the outgoing
1763 * interface.
1764 * (- For site-local destination addresses, the
1765 * set of candidate source addresses MUST only
1766 * include addresses assigned to interfaces
1767 * belonging to the same site as the outgoing
1768 * interface.)
1769 * - "It is RECOMMENDED that the candidate source addresses
1770 * be the set of unicast addresses assigned to the
1771 * interface that will be used to send to the destination
1772 * (the 'outgoing' interface)." (RFC 6724)
1773 */
1774 if (dst_dev) {
1775 idev = __in6_dev_get(dst_dev);
1776 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1777 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1778 (idev && idev->cnf.use_oif_addrs_only)) {
1779 use_oif_addr = true;
1780 }
1781 }
1782
1783 if (use_oif_addr) {
1784 if (idev)
1785 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1786 } else {
1787 const struct net_device *master;
1788 int master_idx = 0;
1789
1790 /* if dst_dev exists and is enslaved to an L3 device, then
1791 * prefer addresses from dst_dev and then the master over
1792 * any other enslaved devices in the L3 domain.
1793 */
1794 master = l3mdev_master_dev_rcu(dst_dev);
1795 if (master) {
1796 master_idx = master->ifindex;
1797
1798 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1799 master, &dst,
1800 scores, hiscore_idx);
1801
1802 if (scores[hiscore_idx].ifa)
1803 goto out;
1804 }
1805
1806 for_each_netdev_rcu(net, dev) {
1807 /* only consider addresses on devices in the
1808 * same L3 domain
1809 */
1810 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1811 continue;
1812 idev = __in6_dev_get(dev);
1813 if (!idev)
1814 continue;
1815 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1816 }
1817 }
1818
1819out:
1820 hiscore = &scores[hiscore_idx];
1821 if (!hiscore->ifa)
1822 ret = -EADDRNOTAVAIL;
1823 else
1824 *saddr = hiscore->ifa->addr;
1825
1826 rcu_read_unlock();
1827 return ret;
1828}
1829EXPORT_SYMBOL(ipv6_dev_get_saddr);
1830
1831int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1832 u32 banned_flags)
1833{
1834 struct inet6_ifaddr *ifp;
1835 int err = -EADDRNOTAVAIL;
1836
1837 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1838 if (ifp->scope > IFA_LINK)
1839 break;
1840 if (ifp->scope == IFA_LINK &&
1841 !(ifp->flags & banned_flags)) {
1842 *addr = ifp->addr;
1843 err = 0;
1844 break;
1845 }
1846 }
1847 return err;
1848}
1849
1850int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1851 u32 banned_flags)
1852{
1853 struct inet6_dev *idev;
1854 int err = -EADDRNOTAVAIL;
1855
1856 rcu_read_lock();
1857 idev = __in6_dev_get(dev);
1858 if (idev) {
1859 read_lock_bh(&idev->lock);
1860 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1861 read_unlock_bh(&idev->lock);
1862 }
1863 rcu_read_unlock();
1864 return err;
1865}
1866
1867static int ipv6_count_addresses(const struct inet6_dev *idev)
1868{
1869 const struct inet6_ifaddr *ifp;
1870 int cnt = 0;
1871
1872 rcu_read_lock();
1873 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1874 cnt++;
1875 rcu_read_unlock();
1876 return cnt;
1877}
1878
1879int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1880 const struct net_device *dev, int strict)
1881{
1882 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1883 strict, IFA_F_TENTATIVE);
1884}
1885EXPORT_SYMBOL(ipv6_chk_addr);
1886
1887/* device argument is used to find the L3 domain of interest. If
1888 * skip_dev_check is set, then the ifp device is not checked against
1889 * the passed in dev argument. So the 2 cases for addresses checks are:
1890 * 1. does the address exist in the L3 domain that dev is part of
1891 * (skip_dev_check = true), or
1892 *
1893 * 2. does the address exist on the specific device
1894 * (skip_dev_check = false)
1895 */
1896static struct net_device *
1897__ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1898 const struct net_device *dev, bool skip_dev_check,
1899 int strict, u32 banned_flags)
1900{
1901 unsigned int hash = inet6_addr_hash(net, addr);
1902 struct net_device *l3mdev, *ndev;
1903 struct inet6_ifaddr *ifp;
1904 u32 ifp_flags;
1905
1906 rcu_read_lock();
1907
1908 l3mdev = l3mdev_master_dev_rcu(dev);
1909 if (skip_dev_check)
1910 dev = NULL;
1911
1912 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1913 ndev = ifp->idev->dev;
1914 if (!net_eq(dev_net(ndev), net))
1915 continue;
1916
1917 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1918 continue;
1919
1920 /* Decouple optimistic from tentative for evaluation here.
1921 * Ban optimistic addresses explicitly, when required.
1922 */
1923 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1924 ? (ifp->flags&~IFA_F_TENTATIVE)
1925 : ifp->flags;
1926 if (ipv6_addr_equal(&ifp->addr, addr) &&
1927 !(ifp_flags&banned_flags) &&
1928 (!dev || ndev == dev ||
1929 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1930 rcu_read_unlock();
1931 return ndev;
1932 }
1933 }
1934
1935 rcu_read_unlock();
1936 return NULL;
1937}
1938
1939int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1940 const struct net_device *dev, bool skip_dev_check,
1941 int strict, u32 banned_flags)
1942{
1943 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1944 strict, banned_flags) ? 1 : 0;
1945}
1946EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1947
1948
1949/* Compares an address/prefix_len with addresses on device @dev.
1950 * If one is found it returns true.
1951 */
1952bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1953 const unsigned int prefix_len, struct net_device *dev)
1954{
1955 const struct inet6_ifaddr *ifa;
1956 const struct inet6_dev *idev;
1957 bool ret = false;
1958
1959 rcu_read_lock();
1960 idev = __in6_dev_get(dev);
1961 if (idev) {
1962 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1963 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1964 if (ret)
1965 break;
1966 }
1967 }
1968 rcu_read_unlock();
1969
1970 return ret;
1971}
1972EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1973
1974int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1975{
1976 const struct inet6_ifaddr *ifa;
1977 const struct inet6_dev *idev;
1978 int onlink;
1979
1980 onlink = 0;
1981 rcu_read_lock();
1982 idev = __in6_dev_get(dev);
1983 if (idev) {
1984 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1985 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1986 ifa->prefix_len);
1987 if (onlink)
1988 break;
1989 }
1990 }
1991 rcu_read_unlock();
1992 return onlink;
1993}
1994EXPORT_SYMBOL(ipv6_chk_prefix);
1995
1996/**
1997 * ipv6_dev_find - find the first device with a given source address.
1998 * @net: the net namespace
1999 * @addr: the source address
2000 *
2001 * The caller should be protected by RCU, or RTNL.
2002 */
2003struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2004 struct net_device *dev)
2005{
2006 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2007 IFA_F_TENTATIVE);
2008}
2009EXPORT_SYMBOL(ipv6_dev_find);
2010
2011struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2012 struct net_device *dev, int strict)
2013{
2014 unsigned int hash = inet6_addr_hash(net, addr);
2015 struct inet6_ifaddr *ifp, *result = NULL;
2016
2017 rcu_read_lock();
2018 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2019 if (!net_eq(dev_net(ifp->idev->dev), net))
2020 continue;
2021 if (ipv6_addr_equal(&ifp->addr, addr)) {
2022 if (!dev || ifp->idev->dev == dev ||
2023 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2024 result = ifp;
2025 in6_ifa_hold(ifp);
2026 break;
2027 }
2028 }
2029 }
2030 rcu_read_unlock();
2031
2032 return result;
2033}
2034
2035/* Gets referenced address, destroys ifaddr */
2036
2037static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2038{
2039 if (dad_failed)
2040 ifp->flags |= IFA_F_DADFAILED;
2041
2042 if (ifp->flags&IFA_F_TEMPORARY) {
2043 struct inet6_ifaddr *ifpub;
2044 spin_lock_bh(&ifp->lock);
2045 ifpub = ifp->ifpub;
2046 if (ifpub) {
2047 in6_ifa_hold(ifpub);
2048 spin_unlock_bh(&ifp->lock);
2049 ipv6_create_tempaddr(ifpub, true);
2050 in6_ifa_put(ifpub);
2051 } else {
2052 spin_unlock_bh(&ifp->lock);
2053 }
2054 ipv6_del_addr(ifp);
2055 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2056 spin_lock_bh(&ifp->lock);
2057 addrconf_del_dad_work(ifp);
2058 ifp->flags |= IFA_F_TENTATIVE;
2059 if (dad_failed)
2060 ifp->flags &= ~IFA_F_OPTIMISTIC;
2061 spin_unlock_bh(&ifp->lock);
2062 if (dad_failed)
2063 ipv6_ifa_notify(0, ifp);
2064 in6_ifa_put(ifp);
2065 } else {
2066 ipv6_del_addr(ifp);
2067 }
2068}
2069
2070static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2071{
2072 int err = -ENOENT;
2073
2074 spin_lock_bh(&ifp->lock);
2075 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2076 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2077 err = 0;
2078 }
2079 spin_unlock_bh(&ifp->lock);
2080
2081 return err;
2082}
2083
2084void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2085{
2086 struct inet6_dev *idev = ifp->idev;
2087 struct net *net = dev_net(ifp->idev->dev);
2088
2089 if (addrconf_dad_end(ifp)) {
2090 in6_ifa_put(ifp);
2091 return;
2092 }
2093
2094 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2095 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2096
2097 spin_lock_bh(&ifp->lock);
2098
2099 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2100 struct in6_addr new_addr;
2101 struct inet6_ifaddr *ifp2;
2102 int retries = ifp->stable_privacy_retry + 1;
2103 struct ifa6_config cfg = {
2104 .pfx = &new_addr,
2105 .plen = ifp->prefix_len,
2106 .ifa_flags = ifp->flags,
2107 .valid_lft = ifp->valid_lft,
2108 .preferred_lft = ifp->prefered_lft,
2109 .scope = ifp->scope,
2110 };
2111
2112 if (retries > net->ipv6.sysctl.idgen_retries) {
2113 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2114 ifp->idev->dev->name);
2115 goto errdad;
2116 }
2117
2118 new_addr = ifp->addr;
2119 if (ipv6_generate_stable_address(&new_addr, retries,
2120 idev))
2121 goto errdad;
2122
2123 spin_unlock_bh(&ifp->lock);
2124
2125 if (idev->cnf.max_addresses &&
2126 ipv6_count_addresses(idev) >=
2127 idev->cnf.max_addresses)
2128 goto lock_errdad;
2129
2130 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2131 ifp->idev->dev->name);
2132
2133 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2134 if (IS_ERR(ifp2))
2135 goto lock_errdad;
2136
2137 spin_lock_bh(&ifp2->lock);
2138 ifp2->stable_privacy_retry = retries;
2139 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2140 spin_unlock_bh(&ifp2->lock);
2141
2142 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2143 in6_ifa_put(ifp2);
2144lock_errdad:
2145 spin_lock_bh(&ifp->lock);
2146 }
2147
2148errdad:
2149 /* transition from _POSTDAD to _ERRDAD */
2150 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2151 spin_unlock_bh(&ifp->lock);
2152
2153 addrconf_mod_dad_work(ifp, 0);
2154 in6_ifa_put(ifp);
2155}
2156
2157/* Join to solicited addr multicast group.
2158 * caller must hold RTNL */
2159void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2160{
2161 struct in6_addr maddr;
2162
2163 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2164 return;
2165
2166 addrconf_addr_solict_mult(addr, &maddr);
2167 ipv6_dev_mc_inc(dev, &maddr);
2168}
2169
2170/* caller must hold RTNL */
2171void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2172{
2173 struct in6_addr maddr;
2174
2175 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2176 return;
2177
2178 addrconf_addr_solict_mult(addr, &maddr);
2179 __ipv6_dev_mc_dec(idev, &maddr);
2180}
2181
2182/* caller must hold RTNL */
2183static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2184{
2185 struct in6_addr addr;
2186
2187 if (ifp->prefix_len >= 127) /* RFC 6164 */
2188 return;
2189 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2190 if (ipv6_addr_any(&addr))
2191 return;
2192 __ipv6_dev_ac_inc(ifp->idev, &addr);
2193}
2194
2195/* caller must hold RTNL */
2196static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2197{
2198 struct in6_addr addr;
2199
2200 if (ifp->prefix_len >= 127) /* RFC 6164 */
2201 return;
2202 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2203 if (ipv6_addr_any(&addr))
2204 return;
2205 __ipv6_dev_ac_dec(ifp->idev, &addr);
2206}
2207
2208static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2209{
2210 switch (dev->addr_len) {
2211 case ETH_ALEN:
2212 memcpy(eui, dev->dev_addr, 3);
2213 eui[3] = 0xFF;
2214 eui[4] = 0xFE;
2215 memcpy(eui + 5, dev->dev_addr + 3, 3);
2216 break;
2217 case EUI64_ADDR_LEN:
2218 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2219 eui[0] ^= 2;
2220 break;
2221 default:
2222 return -1;
2223 }
2224
2225 return 0;
2226}
2227
2228static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2229{
2230 union fwnet_hwaddr *ha;
2231
2232 if (dev->addr_len != FWNET_ALEN)
2233 return -1;
2234
2235 ha = (union fwnet_hwaddr *)dev->dev_addr;
2236
2237 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2238 eui[0] ^= 2;
2239 return 0;
2240}
2241
2242static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2243{
2244 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2245 if (dev->addr_len != ARCNET_ALEN)
2246 return -1;
2247 memset(eui, 0, 7);
2248 eui[7] = *(u8 *)dev->dev_addr;
2249 return 0;
2250}
2251
2252static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2253{
2254 if (dev->addr_len != INFINIBAND_ALEN)
2255 return -1;
2256 memcpy(eui, dev->dev_addr + 12, 8);
2257 eui[0] |= 2;
2258 return 0;
2259}
2260
2261static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2262{
2263 if (addr == 0)
2264 return -1;
2265 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2266 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2267 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2268 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2269 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2270 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2271 eui[1] = 0;
2272 eui[2] = 0x5E;
2273 eui[3] = 0xFE;
2274 memcpy(eui + 4, &addr, 4);
2275 return 0;
2276}
2277
2278static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2279{
2280 if (dev->priv_flags & IFF_ISATAP)
2281 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2282 return -1;
2283}
2284
2285static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2286{
2287 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2288}
2289
2290static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2291{
2292 memcpy(eui, dev->perm_addr, 3);
2293 memcpy(eui + 5, dev->perm_addr + 3, 3);
2294 eui[3] = 0xFF;
2295 eui[4] = 0xFE;
2296 eui[0] ^= 2;
2297 return 0;
2298}
2299
2300static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2301{
2302 switch (dev->type) {
2303 case ARPHRD_ETHER:
2304 case ARPHRD_FDDI:
2305 return addrconf_ifid_eui48(eui, dev);
2306 case ARPHRD_ARCNET:
2307 return addrconf_ifid_arcnet(eui, dev);
2308 case ARPHRD_INFINIBAND:
2309 return addrconf_ifid_infiniband(eui, dev);
2310 case ARPHRD_SIT:
2311 return addrconf_ifid_sit(eui, dev);
2312 case ARPHRD_IPGRE:
2313 case ARPHRD_TUNNEL:
2314 return addrconf_ifid_gre(eui, dev);
2315 case ARPHRD_6LOWPAN:
2316 return addrconf_ifid_6lowpan(eui, dev);
2317 case ARPHRD_IEEE1394:
2318 return addrconf_ifid_ieee1394(eui, dev);
2319 case ARPHRD_TUNNEL6:
2320 case ARPHRD_IP6GRE:
2321 case ARPHRD_RAWIP:
2322 return addrconf_ifid_ip6tnl(eui, dev);
2323 }
2324 return -1;
2325}
2326
2327static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2328{
2329 int err = -1;
2330 struct inet6_ifaddr *ifp;
2331
2332 read_lock_bh(&idev->lock);
2333 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2334 if (ifp->scope > IFA_LINK)
2335 break;
2336 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2337 memcpy(eui, ifp->addr.s6_addr+8, 8);
2338 err = 0;
2339 break;
2340 }
2341 }
2342 read_unlock_bh(&idev->lock);
2343 return err;
2344}
2345
2346/* Generation of a randomized Interface Identifier
2347 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2348 */
2349
2350static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2351{
2352regen:
2353 get_random_bytes(&addr->s6_addr[8], 8);
2354
2355 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2356 * check if generated address is not inappropriate:
2357 *
2358 * - Reserved IPv6 Interface Identifers
2359 * - XXX: already assigned to an address on the device
2360 */
2361
2362 /* Subnet-router anycast: 0000:0000:0000:0000 */
2363 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2364 goto regen;
2365
2366 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2367 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2368 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2369 */
2370 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2371 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2372 goto regen;
2373
2374 /* Reserved subnet anycast addresses */
2375 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2376 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2377 goto regen;
2378}
2379
2380/*
2381 * Add prefix route.
2382 */
2383
2384static void
2385addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2386 struct net_device *dev, unsigned long expires,
2387 u32 flags, gfp_t gfp_flags)
2388{
2389 struct fib6_config cfg = {
2390 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2391 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2392 .fc_ifindex = dev->ifindex,
2393 .fc_expires = expires,
2394 .fc_dst_len = plen,
2395 .fc_flags = RTF_UP | flags,
2396 .fc_nlinfo.nl_net = dev_net(dev),
2397 .fc_protocol = RTPROT_KERNEL,
2398 .fc_type = RTN_UNICAST,
2399 };
2400
2401 cfg.fc_dst = *pfx;
2402
2403 /* Prevent useless cloning on PtP SIT.
2404 This thing is done here expecting that the whole
2405 class of non-broadcast devices need not cloning.
2406 */
2407#if IS_ENABLED(CONFIG_IPV6_SIT)
2408 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2409 cfg.fc_flags |= RTF_NONEXTHOP;
2410#endif
2411
2412 ip6_route_add(&cfg, gfp_flags, NULL);
2413}
2414
2415
2416static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2417 int plen,
2418 const struct net_device *dev,
2419 u32 flags, u32 noflags,
2420 bool no_gw)
2421{
2422 struct fib6_node *fn;
2423 struct fib6_info *rt = NULL;
2424 struct fib6_table *table;
2425 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2426
2427 table = fib6_get_table(dev_net(dev), tb_id);
2428 if (!table)
2429 return NULL;
2430
2431 rcu_read_lock();
2432 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2433 if (!fn)
2434 goto out;
2435
2436 for_each_fib6_node_rt_rcu(fn) {
2437 /* prefix routes only use builtin fib6_nh */
2438 if (rt->nh)
2439 continue;
2440
2441 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2442 continue;
2443 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2444 continue;
2445 if ((rt->fib6_flags & flags) != flags)
2446 continue;
2447 if ((rt->fib6_flags & noflags) != 0)
2448 continue;
2449 if (!fib6_info_hold_safe(rt))
2450 continue;
2451 break;
2452 }
2453out:
2454 rcu_read_unlock();
2455 return rt;
2456}
2457
2458
2459/* Create "default" multicast route to the interface */
2460
2461static void addrconf_add_mroute(struct net_device *dev)
2462{
2463 struct fib6_config cfg = {
2464 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2465 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2466 .fc_ifindex = dev->ifindex,
2467 .fc_dst_len = 8,
2468 .fc_flags = RTF_UP,
2469 .fc_type = RTN_UNICAST,
2470 .fc_nlinfo.nl_net = dev_net(dev),
2471 };
2472
2473 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2474
2475 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2476}
2477
2478static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2479{
2480 struct inet6_dev *idev;
2481
2482 ASSERT_RTNL();
2483
2484 idev = ipv6_find_idev(dev);
2485 if (IS_ERR(idev))
2486 return idev;
2487
2488 if (idev->cnf.disable_ipv6)
2489 return ERR_PTR(-EACCES);
2490
2491 /* Add default multicast route */
2492 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2493 addrconf_add_mroute(dev);
2494
2495 return idev;
2496}
2497
2498static void manage_tempaddrs(struct inet6_dev *idev,
2499 struct inet6_ifaddr *ifp,
2500 __u32 valid_lft, __u32 prefered_lft,
2501 bool create, unsigned long now)
2502{
2503 u32 flags;
2504 struct inet6_ifaddr *ift;
2505
2506 read_lock_bh(&idev->lock);
2507 /* update all temporary addresses in the list */
2508 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2509 int age, max_valid, max_prefered;
2510
2511 if (ifp != ift->ifpub)
2512 continue;
2513
2514 /* RFC 4941 section 3.3:
2515 * If a received option will extend the lifetime of a public
2516 * address, the lifetimes of temporary addresses should
2517 * be extended, subject to the overall constraint that no
2518 * temporary addresses should ever remain "valid" or "preferred"
2519 * for a time longer than (TEMP_VALID_LIFETIME) or
2520 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2521 */
2522 age = (now - ift->cstamp) / HZ;
2523 max_valid = idev->cnf.temp_valid_lft - age;
2524 if (max_valid < 0)
2525 max_valid = 0;
2526
2527 max_prefered = idev->cnf.temp_prefered_lft -
2528 idev->desync_factor - age;
2529 if (max_prefered < 0)
2530 max_prefered = 0;
2531
2532 if (valid_lft > max_valid)
2533 valid_lft = max_valid;
2534
2535 if (prefered_lft > max_prefered)
2536 prefered_lft = max_prefered;
2537
2538 spin_lock(&ift->lock);
2539 flags = ift->flags;
2540 ift->valid_lft = valid_lft;
2541 ift->prefered_lft = prefered_lft;
2542 ift->tstamp = now;
2543 if (prefered_lft > 0)
2544 ift->flags &= ~IFA_F_DEPRECATED;
2545
2546 spin_unlock(&ift->lock);
2547 if (!(flags&IFA_F_TENTATIVE))
2548 ipv6_ifa_notify(0, ift);
2549 }
2550
2551 if ((create || list_empty(&idev->tempaddr_list)) &&
2552 idev->cnf.use_tempaddr > 0) {
2553 /* When a new public address is created as described
2554 * in [ADDRCONF], also create a new temporary address.
2555 * Also create a temporary address if it's enabled but
2556 * no temporary address currently exists.
2557 */
2558 read_unlock_bh(&idev->lock);
2559 ipv6_create_tempaddr(ifp, false);
2560 } else {
2561 read_unlock_bh(&idev->lock);
2562 }
2563}
2564
2565static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2566{
2567 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2568 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2569}
2570
2571int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2572 const struct prefix_info *pinfo,
2573 struct inet6_dev *in6_dev,
2574 const struct in6_addr *addr, int addr_type,
2575 u32 addr_flags, bool sllao, bool tokenized,
2576 __u32 valid_lft, u32 prefered_lft)
2577{
2578 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2579 int create = 0;
2580
2581 if (!ifp && valid_lft) {
2582 int max_addresses = in6_dev->cnf.max_addresses;
2583 struct ifa6_config cfg = {
2584 .pfx = addr,
2585 .plen = pinfo->prefix_len,
2586 .ifa_flags = addr_flags,
2587 .valid_lft = valid_lft,
2588 .preferred_lft = prefered_lft,
2589 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2590 };
2591
2592#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2593 if ((net->ipv6.devconf_all->optimistic_dad ||
2594 in6_dev->cnf.optimistic_dad) &&
2595 !net->ipv6.devconf_all->forwarding && sllao)
2596 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2597#endif
2598
2599 /* Do not allow to create too much of autoconfigured
2600 * addresses; this would be too easy way to crash kernel.
2601 */
2602 if (!max_addresses ||
2603 ipv6_count_addresses(in6_dev) < max_addresses)
2604 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2605
2606 if (IS_ERR_OR_NULL(ifp))
2607 return -1;
2608
2609 create = 1;
2610 spin_lock_bh(&ifp->lock);
2611 ifp->flags |= IFA_F_MANAGETEMPADDR;
2612 ifp->cstamp = jiffies;
2613 ifp->tokenized = tokenized;
2614 spin_unlock_bh(&ifp->lock);
2615 addrconf_dad_start(ifp);
2616 }
2617
2618 if (ifp) {
2619 u32 flags;
2620 unsigned long now;
2621 u32 stored_lft;
2622
2623 /* Update lifetime (RFC4862 5.5.3 e)
2624 * We deviate from RFC4862 by honoring all Valid Lifetimes to
2625 * improve the reaction of SLAAC to renumbering events
2626 * (draft-gont-6man-slaac-renum-06, Section 4.2)
2627 */
2628 spin_lock_bh(&ifp->lock);
2629 now = jiffies;
2630 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2631 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2632 else
2633 stored_lft = 0;
2634
2635 if (!create && stored_lft) {
2636 ifp->valid_lft = valid_lft;
2637 ifp->prefered_lft = prefered_lft;
2638 ifp->tstamp = now;
2639 flags = ifp->flags;
2640 ifp->flags &= ~IFA_F_DEPRECATED;
2641 spin_unlock_bh(&ifp->lock);
2642
2643 if (!(flags&IFA_F_TENTATIVE))
2644 ipv6_ifa_notify(0, ifp);
2645 } else
2646 spin_unlock_bh(&ifp->lock);
2647
2648 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2649 create, now);
2650
2651 in6_ifa_put(ifp);
2652 addrconf_verify();
2653 }
2654
2655 return 0;
2656}
2657EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2658
2659void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2660{
2661 struct prefix_info *pinfo;
2662 __u32 valid_lft;
2663 __u32 prefered_lft;
2664 int addr_type, err;
2665 u32 addr_flags = 0;
2666 struct inet6_dev *in6_dev;
2667 struct net *net = dev_net(dev);
2668
2669 pinfo = (struct prefix_info *) opt;
2670
2671 if (len < sizeof(struct prefix_info)) {
2672 netdev_dbg(dev, "addrconf: prefix option too short\n");
2673 return;
2674 }
2675
2676 /*
2677 * Validation checks ([ADDRCONF], page 19)
2678 */
2679
2680 addr_type = ipv6_addr_type(&pinfo->prefix);
2681
2682 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2683 return;
2684
2685 valid_lft = ntohl(pinfo->valid);
2686 prefered_lft = ntohl(pinfo->prefered);
2687
2688 if (prefered_lft > valid_lft) {
2689 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2690 return;
2691 }
2692
2693 in6_dev = in6_dev_get(dev);
2694
2695 if (!in6_dev) {
2696 net_dbg_ratelimited("addrconf: device %s not configured\n",
2697 dev->name);
2698 return;
2699 }
2700
2701 /*
2702 * Two things going on here:
2703 * 1) Add routes for on-link prefixes
2704 * 2) Configure prefixes with the auto flag set
2705 */
2706
2707 if (pinfo->onlink) {
2708 struct fib6_info *rt;
2709 unsigned long rt_expires;
2710
2711 /* Avoid arithmetic overflow. Really, we could
2712 * save rt_expires in seconds, likely valid_lft,
2713 * but it would require division in fib gc, that it
2714 * not good.
2715 */
2716 if (HZ > USER_HZ)
2717 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2718 else
2719 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2720
2721 if (addrconf_finite_timeout(rt_expires))
2722 rt_expires *= HZ;
2723
2724 rt = addrconf_get_prefix_route(&pinfo->prefix,
2725 pinfo->prefix_len,
2726 dev,
2727 RTF_ADDRCONF | RTF_PREFIX_RT,
2728 RTF_DEFAULT, true);
2729
2730 if (rt) {
2731 /* Autoconf prefix route */
2732 if (valid_lft == 0) {
2733 ip6_del_rt(net, rt, false);
2734 rt = NULL;
2735 } else if (addrconf_finite_timeout(rt_expires)) {
2736 /* not infinity */
2737 fib6_set_expires(rt, jiffies + rt_expires);
2738 } else {
2739 fib6_clean_expires(rt);
2740 }
2741 } else if (valid_lft) {
2742 clock_t expires = 0;
2743 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2744 if (addrconf_finite_timeout(rt_expires)) {
2745 /* not infinity */
2746 flags |= RTF_EXPIRES;
2747 expires = jiffies_to_clock_t(rt_expires);
2748 }
2749 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2750 0, dev, expires, flags,
2751 GFP_ATOMIC);
2752 }
2753 fib6_info_release(rt);
2754 }
2755
2756 /* Try to figure out our local address for this prefix */
2757
2758 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2759 struct in6_addr addr;
2760 bool tokenized = false, dev_addr_generated = false;
2761
2762 if (pinfo->prefix_len == 64) {
2763 memcpy(&addr, &pinfo->prefix, 8);
2764
2765 if (!ipv6_addr_any(&in6_dev->token)) {
2766 read_lock_bh(&in6_dev->lock);
2767 memcpy(addr.s6_addr + 8,
2768 in6_dev->token.s6_addr + 8, 8);
2769 read_unlock_bh(&in6_dev->lock);
2770 tokenized = true;
2771 } else if (is_addr_mode_generate_stable(in6_dev) &&
2772 !ipv6_generate_stable_address(&addr, 0,
2773 in6_dev)) {
2774 addr_flags |= IFA_F_STABLE_PRIVACY;
2775 goto ok;
2776 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2777 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2778 goto put;
2779 } else {
2780 dev_addr_generated = true;
2781 }
2782 goto ok;
2783 }
2784 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2785 pinfo->prefix_len);
2786 goto put;
2787
2788ok:
2789 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2790 &addr, addr_type,
2791 addr_flags, sllao,
2792 tokenized, valid_lft,
2793 prefered_lft);
2794 if (err)
2795 goto put;
2796
2797 /* Ignore error case here because previous prefix add addr was
2798 * successful which will be notified.
2799 */
2800 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2801 addr_type, addr_flags, sllao,
2802 tokenized, valid_lft,
2803 prefered_lft,
2804 dev_addr_generated);
2805 }
2806 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2807put:
2808 in6_dev_put(in6_dev);
2809}
2810
2811static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2812 struct in6_ifreq *ireq)
2813{
2814 struct ip_tunnel_parm p = { };
2815 int err;
2816
2817 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2818 return -EADDRNOTAVAIL;
2819
2820 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2821 p.iph.version = 4;
2822 p.iph.ihl = 5;
2823 p.iph.protocol = IPPROTO_IPV6;
2824 p.iph.ttl = 64;
2825
2826 if (!dev->netdev_ops->ndo_tunnel_ctl)
2827 return -EOPNOTSUPP;
2828 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2829 if (err)
2830 return err;
2831
2832 dev = __dev_get_by_name(net, p.name);
2833 if (!dev)
2834 return -ENOBUFS;
2835 return dev_open(dev, NULL);
2836}
2837
2838/*
2839 * Set destination address.
2840 * Special case for SIT interfaces where we create a new "virtual"
2841 * device.
2842 */
2843int addrconf_set_dstaddr(struct net *net, void __user *arg)
2844{
2845 struct net_device *dev;
2846 struct in6_ifreq ireq;
2847 int err = -ENODEV;
2848
2849 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2850 return -ENODEV;
2851 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2852 return -EFAULT;
2853
2854 rtnl_lock();
2855 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2856 if (dev && dev->type == ARPHRD_SIT)
2857 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2858 rtnl_unlock();
2859 return err;
2860}
2861
2862static int ipv6_mc_config(struct sock *sk, bool join,
2863 const struct in6_addr *addr, int ifindex)
2864{
2865 int ret;
2866
2867 ASSERT_RTNL();
2868
2869 lock_sock(sk);
2870 if (join)
2871 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2872 else
2873 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2874 release_sock(sk);
2875
2876 return ret;
2877}
2878
2879/*
2880 * Manual configuration of address on an interface
2881 */
2882static int inet6_addr_add(struct net *net, int ifindex,
2883 struct ifa6_config *cfg,
2884 struct netlink_ext_ack *extack)
2885{
2886 struct inet6_ifaddr *ifp;
2887 struct inet6_dev *idev;
2888 struct net_device *dev;
2889 unsigned long timeout;
2890 clock_t expires;
2891 u32 flags;
2892
2893 ASSERT_RTNL();
2894
2895 if (cfg->plen > 128)
2896 return -EINVAL;
2897
2898 /* check the lifetime */
2899 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2900 return -EINVAL;
2901
2902 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2903 return -EINVAL;
2904
2905 dev = __dev_get_by_index(net, ifindex);
2906 if (!dev)
2907 return -ENODEV;
2908
2909 idev = addrconf_add_dev(dev);
2910 if (IS_ERR(idev))
2911 return PTR_ERR(idev);
2912
2913 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2914 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2915 true, cfg->pfx, ifindex);
2916
2917 if (ret < 0)
2918 return ret;
2919 }
2920
2921 cfg->scope = ipv6_addr_scope(cfg->pfx);
2922
2923 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2924 if (addrconf_finite_timeout(timeout)) {
2925 expires = jiffies_to_clock_t(timeout * HZ);
2926 cfg->valid_lft = timeout;
2927 flags = RTF_EXPIRES;
2928 } else {
2929 expires = 0;
2930 flags = 0;
2931 cfg->ifa_flags |= IFA_F_PERMANENT;
2932 }
2933
2934 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2935 if (addrconf_finite_timeout(timeout)) {
2936 if (timeout == 0)
2937 cfg->ifa_flags |= IFA_F_DEPRECATED;
2938 cfg->preferred_lft = timeout;
2939 }
2940
2941 ifp = ipv6_add_addr(idev, cfg, true, extack);
2942 if (!IS_ERR(ifp)) {
2943 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2944 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2945 ifp->rt_priority, dev, expires,
2946 flags, GFP_KERNEL);
2947 }
2948
2949 /* Send a netlink notification if DAD is enabled and
2950 * optimistic flag is not set
2951 */
2952 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2953 ipv6_ifa_notify(0, ifp);
2954 /*
2955 * Note that section 3.1 of RFC 4429 indicates
2956 * that the Optimistic flag should not be set for
2957 * manually configured addresses
2958 */
2959 addrconf_dad_start(ifp);
2960 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2961 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2962 cfg->preferred_lft, true, jiffies);
2963 in6_ifa_put(ifp);
2964 addrconf_verify_rtnl();
2965 return 0;
2966 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2967 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2968 cfg->pfx, ifindex);
2969 }
2970
2971 return PTR_ERR(ifp);
2972}
2973
2974static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2975 const struct in6_addr *pfx, unsigned int plen)
2976{
2977 struct inet6_ifaddr *ifp;
2978 struct inet6_dev *idev;
2979 struct net_device *dev;
2980
2981 if (plen > 128)
2982 return -EINVAL;
2983
2984 dev = __dev_get_by_index(net, ifindex);
2985 if (!dev)
2986 return -ENODEV;
2987
2988 idev = __in6_dev_get(dev);
2989 if (!idev)
2990 return -ENXIO;
2991
2992 read_lock_bh(&idev->lock);
2993 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2994 if (ifp->prefix_len == plen &&
2995 ipv6_addr_equal(pfx, &ifp->addr)) {
2996 in6_ifa_hold(ifp);
2997 read_unlock_bh(&idev->lock);
2998
2999 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3000 (ifa_flags & IFA_F_MANAGETEMPADDR))
3001 manage_tempaddrs(idev, ifp, 0, 0, false,
3002 jiffies);
3003 ipv6_del_addr(ifp);
3004 addrconf_verify_rtnl();
3005 if (ipv6_addr_is_multicast(pfx)) {
3006 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3007 false, pfx, dev->ifindex);
3008 }
3009 return 0;
3010 }
3011 }
3012 read_unlock_bh(&idev->lock);
3013 return -EADDRNOTAVAIL;
3014}
3015
3016
3017int addrconf_add_ifaddr(struct net *net, void __user *arg)
3018{
3019 struct ifa6_config cfg = {
3020 .ifa_flags = IFA_F_PERMANENT,
3021 .preferred_lft = INFINITY_LIFE_TIME,
3022 .valid_lft = INFINITY_LIFE_TIME,
3023 };
3024 struct in6_ifreq ireq;
3025 int err;
3026
3027 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3028 return -EPERM;
3029
3030 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3031 return -EFAULT;
3032
3033 cfg.pfx = &ireq.ifr6_addr;
3034 cfg.plen = ireq.ifr6_prefixlen;
3035
3036 rtnl_lock();
3037 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3038 rtnl_unlock();
3039 return err;
3040}
3041
3042int addrconf_del_ifaddr(struct net *net, void __user *arg)
3043{
3044 struct in6_ifreq ireq;
3045 int err;
3046
3047 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3048 return -EPERM;
3049
3050 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3051 return -EFAULT;
3052
3053 rtnl_lock();
3054 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3055 ireq.ifr6_prefixlen);
3056 rtnl_unlock();
3057 return err;
3058}
3059
3060static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3061 int plen, int scope)
3062{
3063 struct inet6_ifaddr *ifp;
3064 struct ifa6_config cfg = {
3065 .pfx = addr,
3066 .plen = plen,
3067 .ifa_flags = IFA_F_PERMANENT,
3068 .valid_lft = INFINITY_LIFE_TIME,
3069 .preferred_lft = INFINITY_LIFE_TIME,
3070 .scope = scope
3071 };
3072
3073 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3074 if (!IS_ERR(ifp)) {
3075 spin_lock_bh(&ifp->lock);
3076 ifp->flags &= ~IFA_F_TENTATIVE;
3077 spin_unlock_bh(&ifp->lock);
3078 rt_genid_bump_ipv6(dev_net(idev->dev));
3079 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3080 in6_ifa_put(ifp);
3081 }
3082}
3083
3084#if IS_ENABLED(CONFIG_IPV6_SIT)
3085static void sit_add_v4_addrs(struct inet6_dev *idev)
3086{
3087 struct in6_addr addr;
3088 struct net_device *dev;
3089 struct net *net = dev_net(idev->dev);
3090 int scope, plen;
3091 u32 pflags = 0;
3092
3093 ASSERT_RTNL();
3094
3095 memset(&addr, 0, sizeof(struct in6_addr));
3096 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3097
3098 if (idev->dev->flags&IFF_POINTOPOINT) {
3099 addr.s6_addr32[0] = htonl(0xfe800000);
3100 scope = IFA_LINK;
3101 plen = 64;
3102 } else {
3103 scope = IPV6_ADDR_COMPATv4;
3104 plen = 96;
3105 pflags |= RTF_NONEXTHOP;
3106 }
3107
3108 if (addr.s6_addr32[3]) {
3109 add_addr(idev, &addr, plen, scope);
3110 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3111 GFP_KERNEL);
3112 return;
3113 }
3114
3115 for_each_netdev(net, dev) {
3116 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3117 if (in_dev && (dev->flags & IFF_UP)) {
3118 struct in_ifaddr *ifa;
3119 int flag = scope;
3120
3121 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3122 addr.s6_addr32[3] = ifa->ifa_local;
3123
3124 if (ifa->ifa_scope == RT_SCOPE_LINK)
3125 continue;
3126 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3127 if (idev->dev->flags&IFF_POINTOPOINT)
3128 continue;
3129 flag |= IFA_HOST;
3130 }
3131
3132 add_addr(idev, &addr, plen, flag);
3133 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3134 0, pflags, GFP_KERNEL);
3135 }
3136 }
3137 }
3138}
3139#endif
3140
3141static void init_loopback(struct net_device *dev)
3142{
3143 struct inet6_dev *idev;
3144
3145 /* ::1 */
3146
3147 ASSERT_RTNL();
3148
3149 idev = ipv6_find_idev(dev);
3150 if (IS_ERR(idev)) {
3151 pr_debug("%s: add_dev failed\n", __func__);
3152 return;
3153 }
3154
3155 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3156}
3157
3158void addrconf_add_linklocal(struct inet6_dev *idev,
3159 const struct in6_addr *addr, u32 flags)
3160{
3161 struct ifa6_config cfg = {
3162 .pfx = addr,
3163 .plen = 64,
3164 .ifa_flags = flags | IFA_F_PERMANENT,
3165 .valid_lft = INFINITY_LIFE_TIME,
3166 .preferred_lft = INFINITY_LIFE_TIME,
3167 .scope = IFA_LINK
3168 };
3169 struct inet6_ifaddr *ifp;
3170
3171#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3172 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3173 idev->cnf.optimistic_dad) &&
3174 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3175 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3176#endif
3177
3178 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3179 if (!IS_ERR(ifp)) {
3180 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3181 0, 0, GFP_ATOMIC);
3182 addrconf_dad_start(ifp);
3183 in6_ifa_put(ifp);
3184 }
3185}
3186EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3187
3188static bool ipv6_reserved_interfaceid(struct in6_addr address)
3189{
3190 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3191 return true;
3192
3193 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3194 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3195 return true;
3196
3197 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3198 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3199 return true;
3200
3201 return false;
3202}
3203
3204static int ipv6_generate_stable_address(struct in6_addr *address,
3205 u8 dad_count,
3206 const struct inet6_dev *idev)
3207{
3208 static DEFINE_SPINLOCK(lock);
3209 static __u32 digest[SHA1_DIGEST_WORDS];
3210 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3211
3212 static union {
3213 char __data[SHA1_BLOCK_SIZE];
3214 struct {
3215 struct in6_addr secret;
3216 __be32 prefix[2];
3217 unsigned char hwaddr[MAX_ADDR_LEN];
3218 u8 dad_count;
3219 } __packed;
3220 } data;
3221
3222 struct in6_addr secret;
3223 struct in6_addr temp;
3224 struct net *net = dev_net(idev->dev);
3225
3226 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3227
3228 if (idev->cnf.stable_secret.initialized)
3229 secret = idev->cnf.stable_secret.secret;
3230 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3231 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3232 else
3233 return -1;
3234
3235retry:
3236 spin_lock_bh(&lock);
3237
3238 sha1_init(digest);
3239 memset(&data, 0, sizeof(data));
3240 memset(workspace, 0, sizeof(workspace));
3241 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3242 data.prefix[0] = address->s6_addr32[0];
3243 data.prefix[1] = address->s6_addr32[1];
3244 data.secret = secret;
3245 data.dad_count = dad_count;
3246
3247 sha1_transform(digest, data.__data, workspace);
3248
3249 temp = *address;
3250 temp.s6_addr32[2] = (__force __be32)digest[0];
3251 temp.s6_addr32[3] = (__force __be32)digest[1];
3252
3253 spin_unlock_bh(&lock);
3254
3255 if (ipv6_reserved_interfaceid(temp)) {
3256 dad_count++;
3257 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3258 return -1;
3259 goto retry;
3260 }
3261
3262 *address = temp;
3263 return 0;
3264}
3265
3266static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3267{
3268 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3269
3270 if (s->initialized)
3271 return;
3272 s = &idev->cnf.stable_secret;
3273 get_random_bytes(&s->secret, sizeof(s->secret));
3274 s->initialized = true;
3275}
3276
3277static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3278{
3279 struct in6_addr addr;
3280
3281 /* no link local addresses on L3 master devices */
3282 if (netif_is_l3_master(idev->dev))
3283 return;
3284
3285 /* no link local addresses on devices flagged as slaves */
3286 if (idev->dev->flags & IFF_SLAVE)
3287 return;
3288
3289 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3290
3291 switch (idev->cnf.addr_gen_mode) {
3292 case IN6_ADDR_GEN_MODE_RANDOM:
3293 ipv6_gen_mode_random_init(idev);
3294 fallthrough;
3295 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3296 if (!ipv6_generate_stable_address(&addr, 0, idev))
3297 addrconf_add_linklocal(idev, &addr,
3298 IFA_F_STABLE_PRIVACY);
3299 else if (prefix_route)
3300 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3301 0, 0, GFP_KERNEL);
3302 break;
3303 case IN6_ADDR_GEN_MODE_EUI64:
3304 /* addrconf_add_linklocal also adds a prefix_route and we
3305 * only need to care about prefix routes if ipv6_generate_eui64
3306 * couldn't generate one.
3307 */
3308 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3309 addrconf_add_linklocal(idev, &addr, 0);
3310 else if (prefix_route)
3311 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3312 0, 0, GFP_KERNEL);
3313 break;
3314 case IN6_ADDR_GEN_MODE_NONE:
3315 default:
3316 /* will not add any link local address */
3317 break;
3318 }
3319}
3320
3321static void addrconf_dev_config(struct net_device *dev)
3322{
3323 struct inet6_dev *idev;
3324
3325 ASSERT_RTNL();
3326
3327 if ((dev->type != ARPHRD_ETHER) &&
3328 (dev->type != ARPHRD_FDDI) &&
3329 (dev->type != ARPHRD_ARCNET) &&
3330 (dev->type != ARPHRD_INFINIBAND) &&
3331 (dev->type != ARPHRD_IEEE1394) &&
3332 (dev->type != ARPHRD_TUNNEL6) &&
3333 (dev->type != ARPHRD_6LOWPAN) &&
3334 (dev->type != ARPHRD_IP6GRE) &&
3335 (dev->type != ARPHRD_IPGRE) &&
3336 (dev->type != ARPHRD_TUNNEL) &&
3337 (dev->type != ARPHRD_NONE) &&
3338 (dev->type != ARPHRD_RAWIP)) {
3339 /* Alas, we support only Ethernet autoconfiguration. */
3340 idev = __in6_dev_get(dev);
3341 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3342 dev->flags & IFF_MULTICAST)
3343 ipv6_mc_up(idev);
3344 return;
3345 }
3346
3347 idev = addrconf_add_dev(dev);
3348 if (IS_ERR(idev))
3349 return;
3350
3351 /* this device type has no EUI support */
3352 if (dev->type == ARPHRD_NONE &&
3353 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3354 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3355
3356 addrconf_addr_gen(idev, false);
3357}
3358
3359#if IS_ENABLED(CONFIG_IPV6_SIT)
3360static void addrconf_sit_config(struct net_device *dev)
3361{
3362 struct inet6_dev *idev;
3363
3364 ASSERT_RTNL();
3365
3366 /*
3367 * Configure the tunnel with one of our IPv4
3368 * addresses... we should configure all of
3369 * our v4 addrs in the tunnel
3370 */
3371
3372 idev = ipv6_find_idev(dev);
3373 if (IS_ERR(idev)) {
3374 pr_debug("%s: add_dev failed\n", __func__);
3375 return;
3376 }
3377
3378 if (dev->priv_flags & IFF_ISATAP) {
3379 addrconf_addr_gen(idev, false);
3380 return;
3381 }
3382
3383 sit_add_v4_addrs(idev);
3384
3385 if (dev->flags&IFF_POINTOPOINT)
3386 addrconf_add_mroute(dev);
3387}
3388#endif
3389
3390#if IS_ENABLED(CONFIG_NET_IPGRE)
3391static void addrconf_gre_config(struct net_device *dev)
3392{
3393 struct inet6_dev *idev;
3394
3395 ASSERT_RTNL();
3396
3397 idev = ipv6_find_idev(dev);
3398 if (IS_ERR(idev)) {
3399 pr_debug("%s: add_dev failed\n", __func__);
3400 return;
3401 }
3402
3403 addrconf_addr_gen(idev, true);
3404 if (dev->flags & IFF_POINTOPOINT)
3405 addrconf_add_mroute(dev);
3406}
3407#endif
3408
3409static int fixup_permanent_addr(struct net *net,
3410 struct inet6_dev *idev,
3411 struct inet6_ifaddr *ifp)
3412{
3413 /* !fib6_node means the host route was removed from the
3414 * FIB, for example, if 'lo' device is taken down. In that
3415 * case regenerate the host route.
3416 */
3417 if (!ifp->rt || !ifp->rt->fib6_node) {
3418 struct fib6_info *f6i, *prev;
3419
3420 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3421 GFP_ATOMIC);
3422 if (IS_ERR(f6i))
3423 return PTR_ERR(f6i);
3424
3425 /* ifp->rt can be accessed outside of rtnl */
3426 spin_lock(&ifp->lock);
3427 prev = ifp->rt;
3428 ifp->rt = f6i;
3429 spin_unlock(&ifp->lock);
3430
3431 fib6_info_release(prev);
3432 }
3433
3434 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3435 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3436 ifp->rt_priority, idev->dev, 0, 0,
3437 GFP_ATOMIC);
3438 }
3439
3440 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3441 addrconf_dad_start(ifp);
3442
3443 return 0;
3444}
3445
3446static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3447{
3448 struct inet6_ifaddr *ifp, *tmp;
3449 struct inet6_dev *idev;
3450
3451 idev = __in6_dev_get(dev);
3452 if (!idev)
3453 return;
3454
3455 write_lock_bh(&idev->lock);
3456
3457 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3458 if ((ifp->flags & IFA_F_PERMANENT) &&
3459 fixup_permanent_addr(net, idev, ifp) < 0) {
3460 write_unlock_bh(&idev->lock);
3461 in6_ifa_hold(ifp);
3462 ipv6_del_addr(ifp);
3463 write_lock_bh(&idev->lock);
3464
3465 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3466 idev->dev->name, &ifp->addr);
3467 }
3468 }
3469
3470 write_unlock_bh(&idev->lock);
3471}
3472
3473static int addrconf_notify(struct notifier_block *this, unsigned long event,
3474 void *ptr)
3475{
3476 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3477 struct netdev_notifier_change_info *change_info;
3478 struct netdev_notifier_changeupper_info *info;
3479 struct inet6_dev *idev = __in6_dev_get(dev);
3480 struct net *net = dev_net(dev);
3481 int run_pending = 0;
3482 int err;
3483
3484 switch (event) {
3485 case NETDEV_REGISTER:
3486 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3487 idev = ipv6_add_dev(dev);
3488 if (IS_ERR(idev))
3489 return notifier_from_errno(PTR_ERR(idev));
3490 }
3491 break;
3492
3493 case NETDEV_CHANGEMTU:
3494 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3495 if (dev->mtu < IPV6_MIN_MTU) {
3496 addrconf_ifdown(dev, dev != net->loopback_dev);
3497 break;
3498 }
3499
3500 if (idev) {
3501 rt6_mtu_change(dev, dev->mtu);
3502 idev->cnf.mtu6 = dev->mtu;
3503 break;
3504 }
3505
3506 /* allocate new idev */
3507 idev = ipv6_add_dev(dev);
3508 if (IS_ERR(idev))
3509 break;
3510
3511 /* device is still not ready */
3512 if (!(idev->if_flags & IF_READY))
3513 break;
3514
3515 run_pending = 1;
3516 fallthrough;
3517 case NETDEV_UP:
3518 case NETDEV_CHANGE:
3519 if (dev->flags & IFF_SLAVE)
3520 break;
3521
3522 if (idev && idev->cnf.disable_ipv6)
3523 break;
3524
3525 if (event == NETDEV_UP) {
3526 /* restore routes for permanent addresses */
3527 addrconf_permanent_addr(net, dev);
3528
3529 if (!addrconf_link_ready(dev)) {
3530 /* device is not ready yet. */
3531 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3532 dev->name);
3533 break;
3534 }
3535
3536 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3537 idev = ipv6_add_dev(dev);
3538
3539 if (!IS_ERR_OR_NULL(idev)) {
3540 idev->if_flags |= IF_READY;
3541 run_pending = 1;
3542 }
3543 } else if (event == NETDEV_CHANGE) {
3544 if (!addrconf_link_ready(dev)) {
3545 /* device is still not ready. */
3546 rt6_sync_down_dev(dev, event);
3547 break;
3548 }
3549
3550 if (!IS_ERR_OR_NULL(idev)) {
3551 if (idev->if_flags & IF_READY) {
3552 /* device is already configured -
3553 * but resend MLD reports, we might
3554 * have roamed and need to update
3555 * multicast snooping switches
3556 */
3557 ipv6_mc_up(idev);
3558 change_info = ptr;
3559 if (change_info->flags_changed & IFF_NOARP)
3560 addrconf_dad_run(idev, true);
3561 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3562 break;
3563 }
3564 idev->if_flags |= IF_READY;
3565 }
3566
3567 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3568 dev->name);
3569
3570 run_pending = 1;
3571 }
3572
3573 switch (dev->type) {
3574#if IS_ENABLED(CONFIG_IPV6_SIT)
3575 case ARPHRD_SIT:
3576 addrconf_sit_config(dev);
3577 break;
3578#endif
3579#if IS_ENABLED(CONFIG_NET_IPGRE)
3580 case ARPHRD_IPGRE:
3581 addrconf_gre_config(dev);
3582 break;
3583#endif
3584 case ARPHRD_LOOPBACK:
3585 init_loopback(dev);
3586 break;
3587
3588 default:
3589 addrconf_dev_config(dev);
3590 break;
3591 }
3592
3593 if (!IS_ERR_OR_NULL(idev)) {
3594 if (run_pending)
3595 addrconf_dad_run(idev, false);
3596
3597 /* Device has an address by now */
3598 rt6_sync_up(dev, RTNH_F_DEAD);
3599
3600 /*
3601 * If the MTU changed during the interface down,
3602 * when the interface up, the changed MTU must be
3603 * reflected in the idev as well as routers.
3604 */
3605 if (idev->cnf.mtu6 != dev->mtu &&
3606 dev->mtu >= IPV6_MIN_MTU) {
3607 rt6_mtu_change(dev, dev->mtu);
3608 idev->cnf.mtu6 = dev->mtu;
3609 }
3610 idev->tstamp = jiffies;
3611 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3612
3613 /*
3614 * If the changed mtu during down is lower than
3615 * IPV6_MIN_MTU stop IPv6 on this interface.
3616 */
3617 if (dev->mtu < IPV6_MIN_MTU)
3618 addrconf_ifdown(dev, dev != net->loopback_dev);
3619 }
3620 break;
3621
3622 case NETDEV_DOWN:
3623 case NETDEV_UNREGISTER:
3624 /*
3625 * Remove all addresses from this interface.
3626 */
3627 addrconf_ifdown(dev, event != NETDEV_DOWN);
3628 break;
3629
3630 case NETDEV_CHANGENAME:
3631 if (idev) {
3632 snmp6_unregister_dev(idev);
3633 addrconf_sysctl_unregister(idev);
3634 err = addrconf_sysctl_register(idev);
3635 if (err)
3636 return notifier_from_errno(err);
3637 err = snmp6_register_dev(idev);
3638 if (err) {
3639 addrconf_sysctl_unregister(idev);
3640 return notifier_from_errno(err);
3641 }
3642 }
3643 break;
3644
3645 case NETDEV_PRE_TYPE_CHANGE:
3646 case NETDEV_POST_TYPE_CHANGE:
3647 if (idev)
3648 addrconf_type_change(dev, event);
3649 break;
3650
3651 case NETDEV_CHANGEUPPER:
3652 info = ptr;
3653
3654 /* flush all routes if dev is linked to or unlinked from
3655 * an L3 master device (e.g., VRF)
3656 */
3657 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3658 addrconf_ifdown(dev, false);
3659 }
3660
3661 return NOTIFY_OK;
3662}
3663
3664/*
3665 * addrconf module should be notified of a device going up
3666 */
3667static struct notifier_block ipv6_dev_notf = {
3668 .notifier_call = addrconf_notify,
3669 .priority = ADDRCONF_NOTIFY_PRIORITY,
3670};
3671
3672static void addrconf_type_change(struct net_device *dev, unsigned long event)
3673{
3674 struct inet6_dev *idev;
3675 ASSERT_RTNL();
3676
3677 idev = __in6_dev_get(dev);
3678
3679 if (event == NETDEV_POST_TYPE_CHANGE)
3680 ipv6_mc_remap(idev);
3681 else if (event == NETDEV_PRE_TYPE_CHANGE)
3682 ipv6_mc_unmap(idev);
3683}
3684
3685static bool addr_is_local(const struct in6_addr *addr)
3686{
3687 return ipv6_addr_type(addr) &
3688 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3689}
3690
3691static int addrconf_ifdown(struct net_device *dev, bool unregister)
3692{
3693 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3694 struct net *net = dev_net(dev);
3695 struct inet6_dev *idev;
3696 struct inet6_ifaddr *ifa, *tmp;
3697 bool keep_addr = false;
3698 int state, i;
3699
3700 ASSERT_RTNL();
3701
3702 rt6_disable_ip(dev, event);
3703
3704 idev = __in6_dev_get(dev);
3705 if (!idev)
3706 return -ENODEV;
3707
3708 /*
3709 * Step 1: remove reference to ipv6 device from parent device.
3710 * Do not dev_put!
3711 */
3712 if (unregister) {
3713 idev->dead = 1;
3714
3715 /* protected by rtnl_lock */
3716 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3717
3718 /* Step 1.5: remove snmp6 entry */
3719 snmp6_unregister_dev(idev);
3720
3721 }
3722
3723 /* combine the user config with event to determine if permanent
3724 * addresses are to be removed from address hash table
3725 */
3726 if (!unregister && !idev->cnf.disable_ipv6) {
3727 /* aggregate the system setting and interface setting */
3728 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3729
3730 if (!_keep_addr)
3731 _keep_addr = idev->cnf.keep_addr_on_down;
3732
3733 keep_addr = (_keep_addr > 0);
3734 }
3735
3736 /* Step 2: clear hash table */
3737 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3738 struct hlist_head *h = &inet6_addr_lst[i];
3739
3740 spin_lock_bh(&addrconf_hash_lock);
3741restart:
3742 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3743 if (ifa->idev == idev) {
3744 addrconf_del_dad_work(ifa);
3745 /* combined flag + permanent flag decide if
3746 * address is retained on a down event
3747 */
3748 if (!keep_addr ||
3749 !(ifa->flags & IFA_F_PERMANENT) ||
3750 addr_is_local(&ifa->addr)) {
3751 hlist_del_init_rcu(&ifa->addr_lst);
3752 goto restart;
3753 }
3754 }
3755 }
3756 spin_unlock_bh(&addrconf_hash_lock);
3757 }
3758
3759 write_lock_bh(&idev->lock);
3760
3761 addrconf_del_rs_timer(idev);
3762
3763 /* Step 2: clear flags for stateless addrconf */
3764 if (!unregister)
3765 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3766
3767 /* Step 3: clear tempaddr list */
3768 while (!list_empty(&idev->tempaddr_list)) {
3769 ifa = list_first_entry(&idev->tempaddr_list,
3770 struct inet6_ifaddr, tmp_list);
3771 list_del(&ifa->tmp_list);
3772 write_unlock_bh(&idev->lock);
3773 spin_lock_bh(&ifa->lock);
3774
3775 if (ifa->ifpub) {
3776 in6_ifa_put(ifa->ifpub);
3777 ifa->ifpub = NULL;
3778 }
3779 spin_unlock_bh(&ifa->lock);
3780 in6_ifa_put(ifa);
3781 write_lock_bh(&idev->lock);
3782 }
3783
3784 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3785 struct fib6_info *rt = NULL;
3786 bool keep;
3787
3788 addrconf_del_dad_work(ifa);
3789
3790 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3791 !addr_is_local(&ifa->addr);
3792
3793 write_unlock_bh(&idev->lock);
3794 spin_lock_bh(&ifa->lock);
3795
3796 if (keep) {
3797 /* set state to skip the notifier below */
3798 state = INET6_IFADDR_STATE_DEAD;
3799 ifa->state = INET6_IFADDR_STATE_PREDAD;
3800 if (!(ifa->flags & IFA_F_NODAD))
3801 ifa->flags |= IFA_F_TENTATIVE;
3802
3803 rt = ifa->rt;
3804 ifa->rt = NULL;
3805 } else {
3806 state = ifa->state;
3807 ifa->state = INET6_IFADDR_STATE_DEAD;
3808 }
3809
3810 spin_unlock_bh(&ifa->lock);
3811
3812 if (rt)
3813 ip6_del_rt(net, rt, false);
3814
3815 if (state != INET6_IFADDR_STATE_DEAD) {
3816 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3817 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3818 } else {
3819 if (idev->cnf.forwarding)
3820 addrconf_leave_anycast(ifa);
3821 addrconf_leave_solict(ifa->idev, &ifa->addr);
3822 }
3823
3824 write_lock_bh(&idev->lock);
3825 if (!keep) {
3826 list_del_rcu(&ifa->if_list);
3827 in6_ifa_put(ifa);
3828 }
3829 }
3830
3831 write_unlock_bh(&idev->lock);
3832
3833 /* Step 5: Discard anycast and multicast list */
3834 if (unregister) {
3835 ipv6_ac_destroy_dev(idev);
3836 ipv6_mc_destroy_dev(idev);
3837 } else {
3838 ipv6_mc_down(idev);
3839 }
3840
3841 idev->tstamp = jiffies;
3842
3843 /* Last: Shot the device (if unregistered) */
3844 if (unregister) {
3845 addrconf_sysctl_unregister(idev);
3846 neigh_parms_release(&nd_tbl, idev->nd_parms);
3847 neigh_ifdown(&nd_tbl, dev);
3848 in6_dev_put(idev);
3849 }
3850 return 0;
3851}
3852
3853static void addrconf_rs_timer(struct timer_list *t)
3854{
3855 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3856 struct net_device *dev = idev->dev;
3857 struct in6_addr lladdr;
3858
3859 write_lock(&idev->lock);
3860 if (idev->dead || !(idev->if_flags & IF_READY))
3861 goto out;
3862
3863 if (!ipv6_accept_ra(idev))
3864 goto out;
3865
3866 /* Announcement received after solicitation was sent */
3867 if (idev->if_flags & IF_RA_RCVD)
3868 goto out;
3869
3870 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3871 write_unlock(&idev->lock);
3872 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3873 ndisc_send_rs(dev, &lladdr,
3874 &in6addr_linklocal_allrouters);
3875 else
3876 goto put;
3877
3878 write_lock(&idev->lock);
3879 idev->rs_interval = rfc3315_s14_backoff_update(
3880 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3881 /* The wait after the last probe can be shorter */
3882 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3883 idev->cnf.rtr_solicits) ?
3884 idev->cnf.rtr_solicit_delay :
3885 idev->rs_interval);
3886 } else {
3887 /*
3888 * Note: we do not support deprecated "all on-link"
3889 * assumption any longer.
3890 */
3891 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3892 }
3893
3894out:
3895 write_unlock(&idev->lock);
3896put:
3897 in6_dev_put(idev);
3898}
3899
3900/*
3901 * Duplicate Address Detection
3902 */
3903static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3904{
3905 unsigned long rand_num;
3906 struct inet6_dev *idev = ifp->idev;
3907 u64 nonce;
3908
3909 if (ifp->flags & IFA_F_OPTIMISTIC)
3910 rand_num = 0;
3911 else
3912 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3913
3914 nonce = 0;
3915 if (idev->cnf.enhanced_dad ||
3916 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3917 do
3918 get_random_bytes(&nonce, 6);
3919 while (nonce == 0);
3920 }
3921 ifp->dad_nonce = nonce;
3922 ifp->dad_probes = idev->cnf.dad_transmits;
3923 addrconf_mod_dad_work(ifp, rand_num);
3924}
3925
3926static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3927{
3928 struct inet6_dev *idev = ifp->idev;
3929 struct net_device *dev = idev->dev;
3930 bool bump_id, notify = false;
3931 struct net *net;
3932
3933 addrconf_join_solict(dev, &ifp->addr);
3934
3935 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3936
3937 read_lock_bh(&idev->lock);
3938 spin_lock(&ifp->lock);
3939 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3940 goto out;
3941
3942 net = dev_net(dev);
3943 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3944 (net->ipv6.devconf_all->accept_dad < 1 &&
3945 idev->cnf.accept_dad < 1) ||
3946 !(ifp->flags&IFA_F_TENTATIVE) ||
3947 ifp->flags & IFA_F_NODAD) {
3948 bool send_na = false;
3949
3950 if (ifp->flags & IFA_F_TENTATIVE &&
3951 !(ifp->flags & IFA_F_OPTIMISTIC))
3952 send_na = true;
3953 bump_id = ifp->flags & IFA_F_TENTATIVE;
3954 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3955 spin_unlock(&ifp->lock);
3956 read_unlock_bh(&idev->lock);
3957
3958 addrconf_dad_completed(ifp, bump_id, send_na);
3959 return;
3960 }
3961
3962 if (!(idev->if_flags & IF_READY)) {
3963 spin_unlock(&ifp->lock);
3964 read_unlock_bh(&idev->lock);
3965 /*
3966 * If the device is not ready:
3967 * - keep it tentative if it is a permanent address.
3968 * - otherwise, kill it.
3969 */
3970 in6_ifa_hold(ifp);
3971 addrconf_dad_stop(ifp, 0);
3972 return;
3973 }
3974
3975 /*
3976 * Optimistic nodes can start receiving
3977 * Frames right away
3978 */
3979 if (ifp->flags & IFA_F_OPTIMISTIC) {
3980 ip6_ins_rt(net, ifp->rt);
3981 if (ipv6_use_optimistic_addr(net, idev)) {
3982 /* Because optimistic nodes can use this address,
3983 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3984 */
3985 notify = true;
3986 }
3987 }
3988
3989 addrconf_dad_kick(ifp);
3990out:
3991 spin_unlock(&ifp->lock);
3992 read_unlock_bh(&idev->lock);
3993 if (notify)
3994 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3995}
3996
3997static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3998{
3999 bool begin_dad = false;
4000
4001 spin_lock_bh(&ifp->lock);
4002 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4003 ifp->state = INET6_IFADDR_STATE_PREDAD;
4004 begin_dad = true;
4005 }
4006 spin_unlock_bh(&ifp->lock);
4007
4008 if (begin_dad)
4009 addrconf_mod_dad_work(ifp, 0);
4010}
4011
4012static void addrconf_dad_work(struct work_struct *w)
4013{
4014 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4015 struct inet6_ifaddr,
4016 dad_work);
4017 struct inet6_dev *idev = ifp->idev;
4018 bool bump_id, disable_ipv6 = false;
4019 struct in6_addr mcaddr;
4020
4021 enum {
4022 DAD_PROCESS,
4023 DAD_BEGIN,
4024 DAD_ABORT,
4025 } action = DAD_PROCESS;
4026
4027 rtnl_lock();
4028
4029 spin_lock_bh(&ifp->lock);
4030 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4031 action = DAD_BEGIN;
4032 ifp->state = INET6_IFADDR_STATE_DAD;
4033 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4034 action = DAD_ABORT;
4035 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4036
4037 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4038 idev->cnf.accept_dad > 1) &&
4039 !idev->cnf.disable_ipv6 &&
4040 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4041 struct in6_addr addr;
4042
4043 addr.s6_addr32[0] = htonl(0xfe800000);
4044 addr.s6_addr32[1] = 0;
4045
4046 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4047 ipv6_addr_equal(&ifp->addr, &addr)) {
4048 /* DAD failed for link-local based on MAC */
4049 idev->cnf.disable_ipv6 = 1;
4050
4051 pr_info("%s: IPv6 being disabled!\n",
4052 ifp->idev->dev->name);
4053 disable_ipv6 = true;
4054 }
4055 }
4056 }
4057 spin_unlock_bh(&ifp->lock);
4058
4059 if (action == DAD_BEGIN) {
4060 addrconf_dad_begin(ifp);
4061 goto out;
4062 } else if (action == DAD_ABORT) {
4063 in6_ifa_hold(ifp);
4064 addrconf_dad_stop(ifp, 1);
4065 if (disable_ipv6)
4066 addrconf_ifdown(idev->dev, false);
4067 goto out;
4068 }
4069
4070 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4071 goto out;
4072
4073 write_lock_bh(&idev->lock);
4074 if (idev->dead || !(idev->if_flags & IF_READY)) {
4075 write_unlock_bh(&idev->lock);
4076 goto out;
4077 }
4078
4079 spin_lock(&ifp->lock);
4080 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4081 spin_unlock(&ifp->lock);
4082 write_unlock_bh(&idev->lock);
4083 goto out;
4084 }
4085
4086 if (ifp->dad_probes == 0) {
4087 bool send_na = false;
4088
4089 /*
4090 * DAD was successful
4091 */
4092
4093 if (ifp->flags & IFA_F_TENTATIVE &&
4094 !(ifp->flags & IFA_F_OPTIMISTIC))
4095 send_na = true;
4096 bump_id = ifp->flags & IFA_F_TENTATIVE;
4097 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4098 spin_unlock(&ifp->lock);
4099 write_unlock_bh(&idev->lock);
4100
4101 addrconf_dad_completed(ifp, bump_id, send_na);
4102
4103 goto out;
4104 }
4105
4106 ifp->dad_probes--;
4107 addrconf_mod_dad_work(ifp,
4108 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4109 HZ/100));
4110 spin_unlock(&ifp->lock);
4111 write_unlock_bh(&idev->lock);
4112
4113 /* send a neighbour solicitation for our addr */
4114 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4115 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4116 ifp->dad_nonce);
4117out:
4118 in6_ifa_put(ifp);
4119 rtnl_unlock();
4120}
4121
4122/* ifp->idev must be at least read locked */
4123static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4124{
4125 struct inet6_ifaddr *ifpiter;
4126 struct inet6_dev *idev = ifp->idev;
4127
4128 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4129 if (ifpiter->scope > IFA_LINK)
4130 break;
4131 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4132 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4133 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4134 IFA_F_PERMANENT)
4135 return false;
4136 }
4137 return true;
4138}
4139
4140static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4141 bool send_na)
4142{
4143 struct net_device *dev = ifp->idev->dev;
4144 struct in6_addr lladdr;
4145 bool send_rs, send_mld;
4146
4147 addrconf_del_dad_work(ifp);
4148
4149 /*
4150 * Configure the address for reception. Now it is valid.
4151 */
4152
4153 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4154
4155 /* If added prefix is link local and we are prepared to process
4156 router advertisements, start sending router solicitations.
4157 */
4158
4159 read_lock_bh(&ifp->idev->lock);
4160 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4161 send_rs = send_mld &&
4162 ipv6_accept_ra(ifp->idev) &&
4163 ifp->idev->cnf.rtr_solicits != 0 &&
4164 (dev->flags&IFF_LOOPBACK) == 0;
4165 read_unlock_bh(&ifp->idev->lock);
4166
4167 /* While dad is in progress mld report's source address is in6_addrany.
4168 * Resend with proper ll now.
4169 */
4170 if (send_mld)
4171 ipv6_mc_dad_complete(ifp->idev);
4172
4173 /* send unsolicited NA if enabled */
4174 if (send_na &&
4175 (ifp->idev->cnf.ndisc_notify ||
4176 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4177 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4178 /*router=*/ !!ifp->idev->cnf.forwarding,
4179 /*solicited=*/ false, /*override=*/ true,
4180 /*inc_opt=*/ true);
4181 }
4182
4183 if (send_rs) {
4184 /*
4185 * If a host as already performed a random delay
4186 * [...] as part of DAD [...] there is no need
4187 * to delay again before sending the first RS
4188 */
4189 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4190 return;
4191 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4192
4193 write_lock_bh(&ifp->idev->lock);
4194 spin_lock(&ifp->lock);
4195 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4196 ifp->idev->cnf.rtr_solicit_interval);
4197 ifp->idev->rs_probes = 1;
4198 ifp->idev->if_flags |= IF_RS_SENT;
4199 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4200 spin_unlock(&ifp->lock);
4201 write_unlock_bh(&ifp->idev->lock);
4202 }
4203
4204 if (bump_id)
4205 rt_genid_bump_ipv6(dev_net(dev));
4206
4207 /* Make sure that a new temporary address will be created
4208 * before this temporary address becomes deprecated.
4209 */
4210 if (ifp->flags & IFA_F_TEMPORARY)
4211 addrconf_verify_rtnl();
4212}
4213
4214static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4215{
4216 struct inet6_ifaddr *ifp;
4217
4218 read_lock_bh(&idev->lock);
4219 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4220 spin_lock(&ifp->lock);
4221 if ((ifp->flags & IFA_F_TENTATIVE &&
4222 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4223 if (restart)
4224 ifp->state = INET6_IFADDR_STATE_PREDAD;
4225 addrconf_dad_kick(ifp);
4226 }
4227 spin_unlock(&ifp->lock);
4228 }
4229 read_unlock_bh(&idev->lock);
4230}
4231
4232#ifdef CONFIG_PROC_FS
4233struct if6_iter_state {
4234 struct seq_net_private p;
4235 int bucket;
4236 int offset;
4237};
4238
4239static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4240{
4241 struct if6_iter_state *state = seq->private;
4242 struct net *net = seq_file_net(seq);
4243 struct inet6_ifaddr *ifa = NULL;
4244 int p = 0;
4245
4246 /* initial bucket if pos is 0 */
4247 if (pos == 0) {
4248 state->bucket = 0;
4249 state->offset = 0;
4250 }
4251
4252 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4253 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4254 addr_lst) {
4255 if (!net_eq(dev_net(ifa->idev->dev), net))
4256 continue;
4257 /* sync with offset */
4258 if (p < state->offset) {
4259 p++;
4260 continue;
4261 }
4262 return ifa;
4263 }
4264
4265 /* prepare for next bucket */
4266 state->offset = 0;
4267 p = 0;
4268 }
4269 return NULL;
4270}
4271
4272static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4273 struct inet6_ifaddr *ifa)
4274{
4275 struct if6_iter_state *state = seq->private;
4276 struct net *net = seq_file_net(seq);
4277
4278 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4279 if (!net_eq(dev_net(ifa->idev->dev), net))
4280 continue;
4281 state->offset++;
4282 return ifa;
4283 }
4284
4285 state->offset = 0;
4286 while (++state->bucket < IN6_ADDR_HSIZE) {
4287 hlist_for_each_entry_rcu(ifa,
4288 &inet6_addr_lst[state->bucket], addr_lst) {
4289 if (!net_eq(dev_net(ifa->idev->dev), net))
4290 continue;
4291 return ifa;
4292 }
4293 }
4294
4295 return NULL;
4296}
4297
4298static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4299 __acquires(rcu)
4300{
4301 rcu_read_lock();
4302 return if6_get_first(seq, *pos);
4303}
4304
4305static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4306{
4307 struct inet6_ifaddr *ifa;
4308
4309 ifa = if6_get_next(seq, v);
4310 ++*pos;
4311 return ifa;
4312}
4313
4314static void if6_seq_stop(struct seq_file *seq, void *v)
4315 __releases(rcu)
4316{
4317 rcu_read_unlock();
4318}
4319
4320static int if6_seq_show(struct seq_file *seq, void *v)
4321{
4322 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4323 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4324 &ifp->addr,
4325 ifp->idev->dev->ifindex,
4326 ifp->prefix_len,
4327 ifp->scope,
4328 (u8) ifp->flags,
4329 ifp->idev->dev->name);
4330 return 0;
4331}
4332
4333static const struct seq_operations if6_seq_ops = {
4334 .start = if6_seq_start,
4335 .next = if6_seq_next,
4336 .show = if6_seq_show,
4337 .stop = if6_seq_stop,
4338};
4339
4340static int __net_init if6_proc_net_init(struct net *net)
4341{
4342 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4343 sizeof(struct if6_iter_state)))
4344 return -ENOMEM;
4345 return 0;
4346}
4347
4348static void __net_exit if6_proc_net_exit(struct net *net)
4349{
4350 remove_proc_entry("if_inet6", net->proc_net);
4351}
4352
4353static struct pernet_operations if6_proc_net_ops = {
4354 .init = if6_proc_net_init,
4355 .exit = if6_proc_net_exit,
4356};
4357
4358int __init if6_proc_init(void)
4359{
4360 return register_pernet_subsys(&if6_proc_net_ops);
4361}
4362
4363void if6_proc_exit(void)
4364{
4365 unregister_pernet_subsys(&if6_proc_net_ops);
4366}
4367#endif /* CONFIG_PROC_FS */
4368
4369#if IS_ENABLED(CONFIG_IPV6_MIP6)
4370/* Check if address is a home address configured on any interface. */
4371int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4372{
4373 unsigned int hash = inet6_addr_hash(net, addr);
4374 struct inet6_ifaddr *ifp = NULL;
4375 int ret = 0;
4376
4377 rcu_read_lock();
4378 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4379 if (!net_eq(dev_net(ifp->idev->dev), net))
4380 continue;
4381 if (ipv6_addr_equal(&ifp->addr, addr) &&
4382 (ifp->flags & IFA_F_HOMEADDRESS)) {
4383 ret = 1;
4384 break;
4385 }
4386 }
4387 rcu_read_unlock();
4388 return ret;
4389}
4390#endif
4391
4392/* RFC6554 has some algorithm to avoid loops in segment routing by
4393 * checking if the segments contains any of a local interface address.
4394 *
4395 * Quote:
4396 *
4397 * To detect loops in the SRH, a router MUST determine if the SRH
4398 * includes multiple addresses assigned to any interface on that router.
4399 * If such addresses appear more than once and are separated by at least
4400 * one address not assigned to that router.
4401 */
4402int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4403 unsigned char nsegs)
4404{
4405 const struct in6_addr *addr;
4406 int i, ret = 0, found = 0;
4407 struct inet6_ifaddr *ifp;
4408 bool separated = false;
4409 unsigned int hash;
4410 bool hash_found;
4411
4412 rcu_read_lock();
4413 for (i = 0; i < nsegs; i++) {
4414 addr = &segs[i];
4415 hash = inet6_addr_hash(net, addr);
4416
4417 hash_found = false;
4418 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4419 if (!net_eq(dev_net(ifp->idev->dev), net))
4420 continue;
4421
4422 if (ipv6_addr_equal(&ifp->addr, addr)) {
4423 hash_found = true;
4424 break;
4425 }
4426 }
4427
4428 if (hash_found) {
4429 if (found > 1 && separated) {
4430 ret = 1;
4431 break;
4432 }
4433
4434 separated = false;
4435 found++;
4436 } else {
4437 separated = true;
4438 }
4439 }
4440 rcu_read_unlock();
4441
4442 return ret;
4443}
4444
4445/*
4446 * Periodic address status verification
4447 */
4448
4449static void addrconf_verify_rtnl(void)
4450{
4451 unsigned long now, next, next_sec, next_sched;
4452 struct inet6_ifaddr *ifp;
4453 int i;
4454
4455 ASSERT_RTNL();
4456
4457 rcu_read_lock_bh();
4458 now = jiffies;
4459 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4460
4461 cancel_delayed_work(&addr_chk_work);
4462
4463 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4464restart:
4465 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4466 unsigned long age;
4467
4468 /* When setting preferred_lft to a value not zero or
4469 * infinity, while valid_lft is infinity
4470 * IFA_F_PERMANENT has a non-infinity life time.
4471 */
4472 if ((ifp->flags & IFA_F_PERMANENT) &&
4473 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4474 continue;
4475
4476 spin_lock(&ifp->lock);
4477 /* We try to batch several events at once. */
4478 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4479
4480 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4481 age >= ifp->valid_lft) {
4482 spin_unlock(&ifp->lock);
4483 in6_ifa_hold(ifp);
4484 ipv6_del_addr(ifp);
4485 goto restart;
4486 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4487 spin_unlock(&ifp->lock);
4488 continue;
4489 } else if (age >= ifp->prefered_lft) {
4490 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4491 int deprecate = 0;
4492
4493 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4494 deprecate = 1;
4495 ifp->flags |= IFA_F_DEPRECATED;
4496 }
4497
4498 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4499 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4500 next = ifp->tstamp + ifp->valid_lft * HZ;
4501
4502 spin_unlock(&ifp->lock);
4503
4504 if (deprecate) {
4505 in6_ifa_hold(ifp);
4506
4507 ipv6_ifa_notify(0, ifp);
4508 in6_ifa_put(ifp);
4509 goto restart;
4510 }
4511 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4512 !(ifp->flags&IFA_F_TENTATIVE)) {
4513 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4514 ifp->idev->cnf.dad_transmits *
4515 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4516
4517 if (age >= ifp->prefered_lft - regen_advance) {
4518 struct inet6_ifaddr *ifpub = ifp->ifpub;
4519 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4520 next = ifp->tstamp + ifp->prefered_lft * HZ;
4521 if (!ifp->regen_count && ifpub) {
4522 ifp->regen_count++;
4523 in6_ifa_hold(ifp);
4524 in6_ifa_hold(ifpub);
4525 spin_unlock(&ifp->lock);
4526
4527 spin_lock(&ifpub->lock);
4528 ifpub->regen_count = 0;
4529 spin_unlock(&ifpub->lock);
4530 rcu_read_unlock_bh();
4531 ipv6_create_tempaddr(ifpub, true);
4532 in6_ifa_put(ifpub);
4533 in6_ifa_put(ifp);
4534 rcu_read_lock_bh();
4535 goto restart;
4536 }
4537 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4538 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4539 spin_unlock(&ifp->lock);
4540 } else {
4541 /* ifp->prefered_lft <= ifp->valid_lft */
4542 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4543 next = ifp->tstamp + ifp->prefered_lft * HZ;
4544 spin_unlock(&ifp->lock);
4545 }
4546 }
4547 }
4548
4549 next_sec = round_jiffies_up(next);
4550 next_sched = next;
4551
4552 /* If rounded timeout is accurate enough, accept it. */
4553 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4554 next_sched = next_sec;
4555
4556 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4557 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4558 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4559
4560 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4561 now, next, next_sec, next_sched);
4562 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4563 rcu_read_unlock_bh();
4564}
4565
4566static void addrconf_verify_work(struct work_struct *w)
4567{
4568 rtnl_lock();
4569 addrconf_verify_rtnl();
4570 rtnl_unlock();
4571}
4572
4573static void addrconf_verify(void)
4574{
4575 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4576}
4577
4578static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4579 struct in6_addr **peer_pfx)
4580{
4581 struct in6_addr *pfx = NULL;
4582
4583 *peer_pfx = NULL;
4584
4585 if (addr)
4586 pfx = nla_data(addr);
4587
4588 if (local) {
4589 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4590 *peer_pfx = pfx;
4591 pfx = nla_data(local);
4592 }
4593
4594 return pfx;
4595}
4596
4597static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4598 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4599 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4600 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4601 [IFA_FLAGS] = { .len = sizeof(u32) },
4602 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4603 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4604};
4605
4606static int
4607inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4608 struct netlink_ext_ack *extack)
4609{
4610 struct net *net = sock_net(skb->sk);
4611 struct ifaddrmsg *ifm;
4612 struct nlattr *tb[IFA_MAX+1];
4613 struct in6_addr *pfx, *peer_pfx;
4614 u32 ifa_flags;
4615 int err;
4616
4617 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4618 ifa_ipv6_policy, extack);
4619 if (err < 0)
4620 return err;
4621
4622 ifm = nlmsg_data(nlh);
4623 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4624 if (!pfx)
4625 return -EINVAL;
4626
4627 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4628
4629 /* We ignore other flags so far. */
4630 ifa_flags &= IFA_F_MANAGETEMPADDR;
4631
4632 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4633 ifm->ifa_prefixlen);
4634}
4635
4636static int modify_prefix_route(struct inet6_ifaddr *ifp,
4637 unsigned long expires, u32 flags,
4638 bool modify_peer)
4639{
4640 struct fib6_info *f6i;
4641 u32 prio;
4642
4643 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4644 ifp->prefix_len,
4645 ifp->idev->dev, 0, RTF_DEFAULT, true);
4646 if (!f6i)
4647 return -ENOENT;
4648
4649 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4650 if (f6i->fib6_metric != prio) {
4651 /* delete old one */
4652 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4653
4654 /* add new one */
4655 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4656 ifp->prefix_len,
4657 ifp->rt_priority, ifp->idev->dev,
4658 expires, flags, GFP_KERNEL);
4659 } else {
4660 if (!expires)
4661 fib6_clean_expires(f6i);
4662 else
4663 fib6_set_expires(f6i, expires);
4664
4665 fib6_info_release(f6i);
4666 }
4667
4668 return 0;
4669}
4670
4671static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4672{
4673 u32 flags;
4674 clock_t expires;
4675 unsigned long timeout;
4676 bool was_managetempaddr;
4677 bool had_prefixroute;
4678 bool new_peer = false;
4679
4680 ASSERT_RTNL();
4681
4682 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4683 return -EINVAL;
4684
4685 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4686 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4687 return -EINVAL;
4688
4689 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4690 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4691
4692 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4693 if (addrconf_finite_timeout(timeout)) {
4694 expires = jiffies_to_clock_t(timeout * HZ);
4695 cfg->valid_lft = timeout;
4696 flags = RTF_EXPIRES;
4697 } else {
4698 expires = 0;
4699 flags = 0;
4700 cfg->ifa_flags |= IFA_F_PERMANENT;
4701 }
4702
4703 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4704 if (addrconf_finite_timeout(timeout)) {
4705 if (timeout == 0)
4706 cfg->ifa_flags |= IFA_F_DEPRECATED;
4707 cfg->preferred_lft = timeout;
4708 }
4709
4710 if (cfg->peer_pfx &&
4711 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4712 if (!ipv6_addr_any(&ifp->peer_addr))
4713 cleanup_prefix_route(ifp, expires, true, true);
4714 new_peer = true;
4715 }
4716
4717 spin_lock_bh(&ifp->lock);
4718 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4719 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4720 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4721 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4722 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4723 IFA_F_NOPREFIXROUTE);
4724 ifp->flags |= cfg->ifa_flags;
4725 ifp->tstamp = jiffies;
4726 ifp->valid_lft = cfg->valid_lft;
4727 ifp->prefered_lft = cfg->preferred_lft;
4728
4729 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4730 ifp->rt_priority = cfg->rt_priority;
4731
4732 if (new_peer)
4733 ifp->peer_addr = *cfg->peer_pfx;
4734
4735 spin_unlock_bh(&ifp->lock);
4736 if (!(ifp->flags&IFA_F_TENTATIVE))
4737 ipv6_ifa_notify(0, ifp);
4738
4739 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4740 int rc = -ENOENT;
4741
4742 if (had_prefixroute)
4743 rc = modify_prefix_route(ifp, expires, flags, false);
4744
4745 /* prefix route could have been deleted; if so restore it */
4746 if (rc == -ENOENT) {
4747 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4748 ifp->rt_priority, ifp->idev->dev,
4749 expires, flags, GFP_KERNEL);
4750 }
4751
4752 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4753 rc = modify_prefix_route(ifp, expires, flags, true);
4754
4755 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4756 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4757 ifp->rt_priority, ifp->idev->dev,
4758 expires, flags, GFP_KERNEL);
4759 }
4760 } else if (had_prefixroute) {
4761 enum cleanup_prefix_rt_t action;
4762 unsigned long rt_expires;
4763
4764 write_lock_bh(&ifp->idev->lock);
4765 action = check_cleanup_prefix_route(ifp, &rt_expires);
4766 write_unlock_bh(&ifp->idev->lock);
4767
4768 if (action != CLEANUP_PREFIX_RT_NOP) {
4769 cleanup_prefix_route(ifp, rt_expires,
4770 action == CLEANUP_PREFIX_RT_DEL, false);
4771 }
4772 }
4773
4774 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4775 if (was_managetempaddr &&
4776 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4777 cfg->valid_lft = 0;
4778 cfg->preferred_lft = 0;
4779 }
4780 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4781 cfg->preferred_lft, !was_managetempaddr,
4782 jiffies);
4783 }
4784
4785 addrconf_verify_rtnl();
4786
4787 return 0;
4788}
4789
4790static int
4791inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4792 struct netlink_ext_ack *extack)
4793{
4794 struct net *net = sock_net(skb->sk);
4795 struct ifaddrmsg *ifm;
4796 struct nlattr *tb[IFA_MAX+1];
4797 struct in6_addr *peer_pfx;
4798 struct inet6_ifaddr *ifa;
4799 struct net_device *dev;
4800 struct inet6_dev *idev;
4801 struct ifa6_config cfg;
4802 int err;
4803
4804 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4805 ifa_ipv6_policy, extack);
4806 if (err < 0)
4807 return err;
4808
4809 memset(&cfg, 0, sizeof(cfg));
4810
4811 ifm = nlmsg_data(nlh);
4812 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4813 if (!cfg.pfx)
4814 return -EINVAL;
4815
4816 cfg.peer_pfx = peer_pfx;
4817 cfg.plen = ifm->ifa_prefixlen;
4818 if (tb[IFA_RT_PRIORITY])
4819 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4820
4821 cfg.valid_lft = INFINITY_LIFE_TIME;
4822 cfg.preferred_lft = INFINITY_LIFE_TIME;
4823
4824 if (tb[IFA_CACHEINFO]) {
4825 struct ifa_cacheinfo *ci;
4826
4827 ci = nla_data(tb[IFA_CACHEINFO]);
4828 cfg.valid_lft = ci->ifa_valid;
4829 cfg.preferred_lft = ci->ifa_prefered;
4830 }
4831
4832 dev = __dev_get_by_index(net, ifm->ifa_index);
4833 if (!dev)
4834 return -ENODEV;
4835
4836 if (tb[IFA_FLAGS])
4837 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4838 else
4839 cfg.ifa_flags = ifm->ifa_flags;
4840
4841 /* We ignore other flags so far. */
4842 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4843 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4844 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4845
4846 idev = ipv6_find_idev(dev);
4847 if (IS_ERR(idev))
4848 return PTR_ERR(idev);
4849
4850 if (!ipv6_allow_optimistic_dad(net, idev))
4851 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4852
4853 if (cfg.ifa_flags & IFA_F_NODAD &&
4854 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4855 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4856 return -EINVAL;
4857 }
4858
4859 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4860 if (!ifa) {
4861 /*
4862 * It would be best to check for !NLM_F_CREATE here but
4863 * userspace already relies on not having to provide this.
4864 */
4865 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4866 }
4867
4868 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4869 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4870 err = -EEXIST;
4871 else
4872 err = inet6_addr_modify(ifa, &cfg);
4873
4874 in6_ifa_put(ifa);
4875
4876 return err;
4877}
4878
4879static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4880 u8 scope, int ifindex)
4881{
4882 struct ifaddrmsg *ifm;
4883
4884 ifm = nlmsg_data(nlh);
4885 ifm->ifa_family = AF_INET6;
4886 ifm->ifa_prefixlen = prefixlen;
4887 ifm->ifa_flags = flags;
4888 ifm->ifa_scope = scope;
4889 ifm->ifa_index = ifindex;
4890}
4891
4892static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4893 unsigned long tstamp, u32 preferred, u32 valid)
4894{
4895 struct ifa_cacheinfo ci;
4896
4897 ci.cstamp = cstamp_delta(cstamp);
4898 ci.tstamp = cstamp_delta(tstamp);
4899 ci.ifa_prefered = preferred;
4900 ci.ifa_valid = valid;
4901
4902 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4903}
4904
4905static inline int rt_scope(int ifa_scope)
4906{
4907 if (ifa_scope & IFA_HOST)
4908 return RT_SCOPE_HOST;
4909 else if (ifa_scope & IFA_LINK)
4910 return RT_SCOPE_LINK;
4911 else if (ifa_scope & IFA_SITE)
4912 return RT_SCOPE_SITE;
4913 else
4914 return RT_SCOPE_UNIVERSE;
4915}
4916
4917static inline int inet6_ifaddr_msgsize(void)
4918{
4919 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4920 + nla_total_size(16) /* IFA_LOCAL */
4921 + nla_total_size(16) /* IFA_ADDRESS */
4922 + nla_total_size(sizeof(struct ifa_cacheinfo))
4923 + nla_total_size(4) /* IFA_FLAGS */
4924 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4925}
4926
4927enum addr_type_t {
4928 UNICAST_ADDR,
4929 MULTICAST_ADDR,
4930 ANYCAST_ADDR,
4931};
4932
4933struct inet6_fill_args {
4934 u32 portid;
4935 u32 seq;
4936 int event;
4937 unsigned int flags;
4938 int netnsid;
4939 int ifindex;
4940 enum addr_type_t type;
4941};
4942
4943static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4944 struct inet6_fill_args *args)
4945{
4946 struct nlmsghdr *nlh;
4947 u32 preferred, valid;
4948
4949 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4950 sizeof(struct ifaddrmsg), args->flags);
4951 if (!nlh)
4952 return -EMSGSIZE;
4953
4954 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4955 ifa->idev->dev->ifindex);
4956
4957 if (args->netnsid >= 0 &&
4958 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4959 goto error;
4960
4961 if (!((ifa->flags&IFA_F_PERMANENT) &&
4962 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4963 preferred = ifa->prefered_lft;
4964 valid = ifa->valid_lft;
4965 if (preferred != INFINITY_LIFE_TIME) {
4966 long tval = (jiffies - ifa->tstamp)/HZ;
4967 if (preferred > tval)
4968 preferred -= tval;
4969 else
4970 preferred = 0;
4971 if (valid != INFINITY_LIFE_TIME) {
4972 if (valid > tval)
4973 valid -= tval;
4974 else
4975 valid = 0;
4976 }
4977 }
4978 } else {
4979 preferred = INFINITY_LIFE_TIME;
4980 valid = INFINITY_LIFE_TIME;
4981 }
4982
4983 if (!ipv6_addr_any(&ifa->peer_addr)) {
4984 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4985 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4986 goto error;
4987 } else
4988 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4989 goto error;
4990
4991 if (ifa->rt_priority &&
4992 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4993 goto error;
4994
4995 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4996 goto error;
4997
4998 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4999 goto error;
5000
5001 nlmsg_end(skb, nlh);
5002 return 0;
5003
5004error:
5005 nlmsg_cancel(skb, nlh);
5006 return -EMSGSIZE;
5007}
5008
5009static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5010 struct inet6_fill_args *args)
5011{
5012 struct nlmsghdr *nlh;
5013 u8 scope = RT_SCOPE_UNIVERSE;
5014 int ifindex = ifmca->idev->dev->ifindex;
5015
5016 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5017 scope = RT_SCOPE_SITE;
5018
5019 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5020 sizeof(struct ifaddrmsg), args->flags);
5021 if (!nlh)
5022 return -EMSGSIZE;
5023
5024 if (args->netnsid >= 0 &&
5025 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5026 return -EMSGSIZE;
5027
5028 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5029 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5030 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5031 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5032 nlmsg_cancel(skb, nlh);
5033 return -EMSGSIZE;
5034 }
5035
5036 nlmsg_end(skb, nlh);
5037 return 0;
5038}
5039
5040static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5041 struct inet6_fill_args *args)
5042{
5043 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5044 int ifindex = dev ? dev->ifindex : 1;
5045 struct nlmsghdr *nlh;
5046 u8 scope = RT_SCOPE_UNIVERSE;
5047
5048 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5049 scope = RT_SCOPE_SITE;
5050
5051 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5052 sizeof(struct ifaddrmsg), args->flags);
5053 if (!nlh)
5054 return -EMSGSIZE;
5055
5056 if (args->netnsid >= 0 &&
5057 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5058 return -EMSGSIZE;
5059
5060 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5061 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5062 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5063 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5064 nlmsg_cancel(skb, nlh);
5065 return -EMSGSIZE;
5066 }
5067
5068 nlmsg_end(skb, nlh);
5069 return 0;
5070}
5071
5072/* called with rcu_read_lock() */
5073static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5074 struct netlink_callback *cb, int s_ip_idx,
5075 struct inet6_fill_args *fillargs)
5076{
5077 struct ifmcaddr6 *ifmca;
5078 struct ifacaddr6 *ifaca;
5079 int ip_idx = 0;
5080 int err = 1;
5081
5082 read_lock_bh(&idev->lock);
5083 switch (fillargs->type) {
5084 case UNICAST_ADDR: {
5085 struct inet6_ifaddr *ifa;
5086 fillargs->event = RTM_NEWADDR;
5087
5088 /* unicast address incl. temp addr */
5089 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5090 if (ip_idx < s_ip_idx)
5091 goto next;
5092 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5093 if (err < 0)
5094 break;
5095 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5096next:
5097 ip_idx++;
5098 }
5099 break;
5100 }
5101 case MULTICAST_ADDR:
5102 fillargs->event = RTM_GETMULTICAST;
5103
5104 /* multicast address */
5105 for (ifmca = idev->mc_list; ifmca;
5106 ifmca = ifmca->next, ip_idx++) {
5107 if (ip_idx < s_ip_idx)
5108 continue;
5109 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5110 if (err < 0)
5111 break;
5112 }
5113 break;
5114 case ANYCAST_ADDR:
5115 fillargs->event = RTM_GETANYCAST;
5116 /* anycast address */
5117 for (ifaca = idev->ac_list; ifaca;
5118 ifaca = ifaca->aca_next, ip_idx++) {
5119 if (ip_idx < s_ip_idx)
5120 continue;
5121 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5122 if (err < 0)
5123 break;
5124 }
5125 break;
5126 default:
5127 break;
5128 }
5129 read_unlock_bh(&idev->lock);
5130 cb->args[2] = ip_idx;
5131 return err;
5132}
5133
5134static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5135 struct inet6_fill_args *fillargs,
5136 struct net **tgt_net, struct sock *sk,
5137 struct netlink_callback *cb)
5138{
5139 struct netlink_ext_ack *extack = cb->extack;
5140 struct nlattr *tb[IFA_MAX+1];
5141 struct ifaddrmsg *ifm;
5142 int err, i;
5143
5144 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5145 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5146 return -EINVAL;
5147 }
5148
5149 ifm = nlmsg_data(nlh);
5150 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5151 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5152 return -EINVAL;
5153 }
5154
5155 fillargs->ifindex = ifm->ifa_index;
5156 if (fillargs->ifindex) {
5157 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5158 fillargs->flags |= NLM_F_DUMP_FILTERED;
5159 }
5160
5161 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5162 ifa_ipv6_policy, extack);
5163 if (err < 0)
5164 return err;
5165
5166 for (i = 0; i <= IFA_MAX; ++i) {
5167 if (!tb[i])
5168 continue;
5169
5170 if (i == IFA_TARGET_NETNSID) {
5171 struct net *net;
5172
5173 fillargs->netnsid = nla_get_s32(tb[i]);
5174 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5175 if (IS_ERR(net)) {
5176 fillargs->netnsid = -1;
5177 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5178 return PTR_ERR(net);
5179 }
5180 *tgt_net = net;
5181 } else {
5182 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5183 return -EINVAL;
5184 }
5185 }
5186
5187 return 0;
5188}
5189
5190static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5191 enum addr_type_t type)
5192{
5193 const struct nlmsghdr *nlh = cb->nlh;
5194 struct inet6_fill_args fillargs = {
5195 .portid = NETLINK_CB(cb->skb).portid,
5196 .seq = cb->nlh->nlmsg_seq,
5197 .flags = NLM_F_MULTI,
5198 .netnsid = -1,
5199 .type = type,
5200 };
5201 struct net *net = sock_net(skb->sk);
5202 struct net *tgt_net = net;
5203 int idx, s_idx, s_ip_idx;
5204 int h, s_h;
5205 struct net_device *dev;
5206 struct inet6_dev *idev;
5207 struct hlist_head *head;
5208 int err = 0;
5209
5210 s_h = cb->args[0];
5211 s_idx = idx = cb->args[1];
5212 s_ip_idx = cb->args[2];
5213
5214 if (cb->strict_check) {
5215 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5216 skb->sk, cb);
5217 if (err < 0)
5218 goto put_tgt_net;
5219
5220 err = 0;
5221 if (fillargs.ifindex) {
5222 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5223 if (!dev) {
5224 err = -ENODEV;
5225 goto put_tgt_net;
5226 }
5227 idev = __in6_dev_get(dev);
5228 if (idev) {
5229 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5230 &fillargs);
5231 if (err > 0)
5232 err = 0;
5233 }
5234 goto put_tgt_net;
5235 }
5236 }
5237
5238 rcu_read_lock();
5239 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5240 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5241 idx = 0;
5242 head = &tgt_net->dev_index_head[h];
5243 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5244 if (idx < s_idx)
5245 goto cont;
5246 if (h > s_h || idx > s_idx)
5247 s_ip_idx = 0;
5248 idev = __in6_dev_get(dev);
5249 if (!idev)
5250 goto cont;
5251
5252 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5253 &fillargs) < 0)
5254 goto done;
5255cont:
5256 idx++;
5257 }
5258 }
5259done:
5260 rcu_read_unlock();
5261 cb->args[0] = h;
5262 cb->args[1] = idx;
5263put_tgt_net:
5264 if (fillargs.netnsid >= 0)
5265 put_net(tgt_net);
5266
5267 return skb->len ? : err;
5268}
5269
5270static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5271{
5272 enum addr_type_t type = UNICAST_ADDR;
5273
5274 return inet6_dump_addr(skb, cb, type);
5275}
5276
5277static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5278{
5279 enum addr_type_t type = MULTICAST_ADDR;
5280
5281 return inet6_dump_addr(skb, cb, type);
5282}
5283
5284
5285static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5286{
5287 enum addr_type_t type = ANYCAST_ADDR;
5288
5289 return inet6_dump_addr(skb, cb, type);
5290}
5291
5292static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5293 const struct nlmsghdr *nlh,
5294 struct nlattr **tb,
5295 struct netlink_ext_ack *extack)
5296{
5297 struct ifaddrmsg *ifm;
5298 int i, err;
5299
5300 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5301 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5302 return -EINVAL;
5303 }
5304
5305 if (!netlink_strict_get_check(skb))
5306 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5307 ifa_ipv6_policy, extack);
5308
5309 ifm = nlmsg_data(nlh);
5310 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5311 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5312 return -EINVAL;
5313 }
5314
5315 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5316 ifa_ipv6_policy, extack);
5317 if (err)
5318 return err;
5319
5320 for (i = 0; i <= IFA_MAX; i++) {
5321 if (!tb[i])
5322 continue;
5323
5324 switch (i) {
5325 case IFA_TARGET_NETNSID:
5326 case IFA_ADDRESS:
5327 case IFA_LOCAL:
5328 break;
5329 default:
5330 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5331 return -EINVAL;
5332 }
5333 }
5334
5335 return 0;
5336}
5337
5338static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5339 struct netlink_ext_ack *extack)
5340{
5341 struct net *net = sock_net(in_skb->sk);
5342 struct inet6_fill_args fillargs = {
5343 .portid = NETLINK_CB(in_skb).portid,
5344 .seq = nlh->nlmsg_seq,
5345 .event = RTM_NEWADDR,
5346 .flags = 0,
5347 .netnsid = -1,
5348 };
5349 struct net *tgt_net = net;
5350 struct ifaddrmsg *ifm;
5351 struct nlattr *tb[IFA_MAX+1];
5352 struct in6_addr *addr = NULL, *peer;
5353 struct net_device *dev = NULL;
5354 struct inet6_ifaddr *ifa;
5355 struct sk_buff *skb;
5356 int err;
5357
5358 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5359 if (err < 0)
5360 return err;
5361
5362 if (tb[IFA_TARGET_NETNSID]) {
5363 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5364
5365 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5366 fillargs.netnsid);
5367 if (IS_ERR(tgt_net))
5368 return PTR_ERR(tgt_net);
5369 }
5370
5371 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5372 if (!addr)
5373 return -EINVAL;
5374
5375 ifm = nlmsg_data(nlh);
5376 if (ifm->ifa_index)
5377 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5378
5379 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5380 if (!ifa) {
5381 err = -EADDRNOTAVAIL;
5382 goto errout;
5383 }
5384
5385 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5386 if (!skb) {
5387 err = -ENOBUFS;
5388 goto errout_ifa;
5389 }
5390
5391 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5392 if (err < 0) {
5393 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5394 WARN_ON(err == -EMSGSIZE);
5395 kfree_skb(skb);
5396 goto errout_ifa;
5397 }
5398 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5399errout_ifa:
5400 in6_ifa_put(ifa);
5401errout:
5402 if (dev)
5403 dev_put(dev);
5404 if (fillargs.netnsid >= 0)
5405 put_net(tgt_net);
5406
5407 return err;
5408}
5409
5410static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5411{
5412 struct sk_buff *skb;
5413 struct net *net = dev_net(ifa->idev->dev);
5414 struct inet6_fill_args fillargs = {
5415 .portid = 0,
5416 .seq = 0,
5417 .event = event,
5418 .flags = 0,
5419 .netnsid = -1,
5420 };
5421 int err = -ENOBUFS;
5422
5423 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5424 if (!skb)
5425 goto errout;
5426
5427 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5428 if (err < 0) {
5429 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5430 WARN_ON(err == -EMSGSIZE);
5431 kfree_skb(skb);
5432 goto errout;
5433 }
5434 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5435 return;
5436errout:
5437 if (err < 0)
5438 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5439}
5440
5441static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5442 __s32 *array, int bytes)
5443{
5444 BUG_ON(bytes < (DEVCONF_MAX * 4));
5445
5446 memset(array, 0, bytes);
5447 array[DEVCONF_FORWARDING] = cnf->forwarding;
5448 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5449 array[DEVCONF_MTU6] = cnf->mtu6;
5450 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5451 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5452 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5453 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5454 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5455 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5456 jiffies_to_msecs(cnf->rtr_solicit_interval);
5457 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5458 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5459 array[DEVCONF_RTR_SOLICIT_DELAY] =
5460 jiffies_to_msecs(cnf->rtr_solicit_delay);
5461 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5462 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5463 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5464 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5465 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5466 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5467 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5468 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5469 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5470 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5471 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5472 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5473 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5474 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5475#ifdef CONFIG_IPV6_ROUTER_PREF
5476 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5477 array[DEVCONF_RTR_PROBE_INTERVAL] =
5478 jiffies_to_msecs(cnf->rtr_probe_interval);
5479#ifdef CONFIG_IPV6_ROUTE_INFO
5480 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5481 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5482#endif
5483#endif
5484 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5485 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5486#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5487 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5488 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5489#endif
5490#ifdef CONFIG_IPV6_MROUTE
5491 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5492#endif
5493 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5494 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5495 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5496 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5497 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5498 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5499 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5500 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5501 /* we omit DEVCONF_STABLE_SECRET for now */
5502 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5503 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5504 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5505 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5506 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5507#ifdef CONFIG_IPV6_SEG6_HMAC
5508 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5509#endif
5510 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5511 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5512 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5513 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5514 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5515}
5516
5517static inline size_t inet6_ifla6_size(void)
5518{
5519 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5520 + nla_total_size(sizeof(struct ifla_cacheinfo))
5521 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5522 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5523 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5524 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5525 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5526 + 0;
5527}
5528
5529static inline size_t inet6_if_nlmsg_size(void)
5530{
5531 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5532 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5533 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5534 + nla_total_size(4) /* IFLA_MTU */
5535 + nla_total_size(4) /* IFLA_LINK */
5536 + nla_total_size(1) /* IFLA_OPERSTATE */
5537 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5538}
5539
5540static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5541 int bytes)
5542{
5543 int i;
5544 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5545 BUG_ON(pad < 0);
5546
5547 /* Use put_unaligned() because stats may not be aligned for u64. */
5548 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5549 for (i = 1; i < ICMP6_MIB_MAX; i++)
5550 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5551
5552 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5553}
5554
5555static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5556 int bytes, size_t syncpoff)
5557{
5558 int i, c;
5559 u64 buff[IPSTATS_MIB_MAX];
5560 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5561
5562 BUG_ON(pad < 0);
5563
5564 memset(buff, 0, sizeof(buff));
5565 buff[0] = IPSTATS_MIB_MAX;
5566
5567 for_each_possible_cpu(c) {
5568 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5569 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5570 }
5571
5572 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5573 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5574}
5575
5576static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5577 int bytes)
5578{
5579 switch (attrtype) {
5580 case IFLA_INET6_STATS:
5581 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5582 offsetof(struct ipstats_mib, syncp));
5583 break;
5584 case IFLA_INET6_ICMP6STATS:
5585 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5586 break;
5587 }
5588}
5589
5590static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5591 u32 ext_filter_mask)
5592{
5593 struct nlattr *nla;
5594 struct ifla_cacheinfo ci;
5595
5596 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5597 goto nla_put_failure;
5598 ci.max_reasm_len = IPV6_MAXPLEN;
5599 ci.tstamp = cstamp_delta(idev->tstamp);
5600 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5601 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5602 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5603 goto nla_put_failure;
5604 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5605 if (!nla)
5606 goto nla_put_failure;
5607 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5608
5609 /* XXX - MC not implemented */
5610
5611 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5612 return 0;
5613
5614 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5615 if (!nla)
5616 goto nla_put_failure;
5617 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5618
5619 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5620 if (!nla)
5621 goto nla_put_failure;
5622 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5623
5624 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5625 if (!nla)
5626 goto nla_put_failure;
5627 read_lock_bh(&idev->lock);
5628 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5629 read_unlock_bh(&idev->lock);
5630
5631 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5632 goto nla_put_failure;
5633
5634 return 0;
5635
5636nla_put_failure:
5637 return -EMSGSIZE;
5638}
5639
5640static size_t inet6_get_link_af_size(const struct net_device *dev,
5641 u32 ext_filter_mask)
5642{
5643 if (!__in6_dev_get(dev))
5644 return 0;
5645
5646 return inet6_ifla6_size();
5647}
5648
5649static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5650 u32 ext_filter_mask)
5651{
5652 struct inet6_dev *idev = __in6_dev_get(dev);
5653
5654 if (!idev)
5655 return -ENODATA;
5656
5657 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5658 return -EMSGSIZE;
5659
5660 return 0;
5661}
5662
5663static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5664{
5665 struct inet6_ifaddr *ifp;
5666 struct net_device *dev = idev->dev;
5667 bool clear_token, update_rs = false;
5668 struct in6_addr ll_addr;
5669
5670 ASSERT_RTNL();
5671
5672 if (!token)
5673 return -EINVAL;
5674 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5675 return -EINVAL;
5676 if (!ipv6_accept_ra(idev))
5677 return -EINVAL;
5678 if (idev->cnf.rtr_solicits == 0)
5679 return -EINVAL;
5680
5681 write_lock_bh(&idev->lock);
5682
5683 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5684 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5685
5686 write_unlock_bh(&idev->lock);
5687
5688 clear_token = ipv6_addr_any(token);
5689 if (clear_token)
5690 goto update_lft;
5691
5692 if (!idev->dead && (idev->if_flags & IF_READY) &&
5693 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5694 IFA_F_OPTIMISTIC)) {
5695 /* If we're not ready, then normal ifup will take care
5696 * of this. Otherwise, we need to request our rs here.
5697 */
5698 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5699 update_rs = true;
5700 }
5701
5702update_lft:
5703 write_lock_bh(&idev->lock);
5704
5705 if (update_rs) {
5706 idev->if_flags |= IF_RS_SENT;
5707 idev->rs_interval = rfc3315_s14_backoff_init(
5708 idev->cnf.rtr_solicit_interval);
5709 idev->rs_probes = 1;
5710 addrconf_mod_rs_timer(idev, idev->rs_interval);
5711 }
5712
5713 /* Well, that's kinda nasty ... */
5714 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5715 spin_lock(&ifp->lock);
5716 if (ifp->tokenized) {
5717 ifp->valid_lft = 0;
5718 ifp->prefered_lft = 0;
5719 }
5720 spin_unlock(&ifp->lock);
5721 }
5722
5723 write_unlock_bh(&idev->lock);
5724 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5725 addrconf_verify_rtnl();
5726 return 0;
5727}
5728
5729static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5730 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5731 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5732};
5733
5734static int check_addr_gen_mode(int mode)
5735{
5736 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5737 mode != IN6_ADDR_GEN_MODE_NONE &&
5738 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5739 mode != IN6_ADDR_GEN_MODE_RANDOM)
5740 return -EINVAL;
5741 return 1;
5742}
5743
5744static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5745 int mode)
5746{
5747 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5748 !idev->cnf.stable_secret.initialized &&
5749 !net->ipv6.devconf_dflt->stable_secret.initialized)
5750 return -EINVAL;
5751 return 1;
5752}
5753
5754static int inet6_validate_link_af(const struct net_device *dev,
5755 const struct nlattr *nla)
5756{
5757 struct nlattr *tb[IFLA_INET6_MAX + 1];
5758 struct inet6_dev *idev = NULL;
5759 int err;
5760
5761 if (dev) {
5762 idev = __in6_dev_get(dev);
5763 if (!idev)
5764 return -EAFNOSUPPORT;
5765 }
5766
5767 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5768 inet6_af_policy, NULL);
5769 if (err)
5770 return err;
5771
5772 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5773 return -EINVAL;
5774
5775 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5776 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5777
5778 if (check_addr_gen_mode(mode) < 0)
5779 return -EINVAL;
5780 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5781 return -EINVAL;
5782 }
5783
5784 return 0;
5785}
5786
5787static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5788{
5789 struct inet6_dev *idev = __in6_dev_get(dev);
5790 struct nlattr *tb[IFLA_INET6_MAX + 1];
5791 int err;
5792
5793 if (!idev)
5794 return -EAFNOSUPPORT;
5795
5796 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5797 BUG();
5798
5799 if (tb[IFLA_INET6_TOKEN]) {
5800 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5801 if (err)
5802 return err;
5803 }
5804
5805 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5806 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5807
5808 idev->cnf.addr_gen_mode = mode;
5809 }
5810
5811 return 0;
5812}
5813
5814static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5815 u32 portid, u32 seq, int event, unsigned int flags)
5816{
5817 struct net_device *dev = idev->dev;
5818 struct ifinfomsg *hdr;
5819 struct nlmsghdr *nlh;
5820 void *protoinfo;
5821
5822 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5823 if (!nlh)
5824 return -EMSGSIZE;
5825
5826 hdr = nlmsg_data(nlh);
5827 hdr->ifi_family = AF_INET6;
5828 hdr->__ifi_pad = 0;
5829 hdr->ifi_type = dev->type;
5830 hdr->ifi_index = dev->ifindex;
5831 hdr->ifi_flags = dev_get_flags(dev);
5832 hdr->ifi_change = 0;
5833
5834 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5835 (dev->addr_len &&
5836 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5837 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5838 (dev->ifindex != dev_get_iflink(dev) &&
5839 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5840 nla_put_u8(skb, IFLA_OPERSTATE,
5841 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5842 goto nla_put_failure;
5843 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5844 if (!protoinfo)
5845 goto nla_put_failure;
5846
5847 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5848 goto nla_put_failure;
5849
5850 nla_nest_end(skb, protoinfo);
5851 nlmsg_end(skb, nlh);
5852 return 0;
5853
5854nla_put_failure:
5855 nlmsg_cancel(skb, nlh);
5856 return -EMSGSIZE;
5857}
5858
5859static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5860 struct netlink_ext_ack *extack)
5861{
5862 struct ifinfomsg *ifm;
5863
5864 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5865 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5866 return -EINVAL;
5867 }
5868
5869 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5870 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5871 return -EINVAL;
5872 }
5873
5874 ifm = nlmsg_data(nlh);
5875 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5876 ifm->ifi_change || ifm->ifi_index) {
5877 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5878 return -EINVAL;
5879 }
5880
5881 return 0;
5882}
5883
5884static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5885{
5886 struct net *net = sock_net(skb->sk);
5887 int h, s_h;
5888 int idx = 0, s_idx;
5889 struct net_device *dev;
5890 struct inet6_dev *idev;
5891 struct hlist_head *head;
5892
5893 /* only requests using strict checking can pass data to
5894 * influence the dump
5895 */
5896 if (cb->strict_check) {
5897 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5898
5899 if (err < 0)
5900 return err;
5901 }
5902
5903 s_h = cb->args[0];
5904 s_idx = cb->args[1];
5905
5906 rcu_read_lock();
5907 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5908 idx = 0;
5909 head = &net->dev_index_head[h];
5910 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5911 if (idx < s_idx)
5912 goto cont;
5913 idev = __in6_dev_get(dev);
5914 if (!idev)
5915 goto cont;
5916 if (inet6_fill_ifinfo(skb, idev,
5917 NETLINK_CB(cb->skb).portid,
5918 cb->nlh->nlmsg_seq,
5919 RTM_NEWLINK, NLM_F_MULTI) < 0)
5920 goto out;
5921cont:
5922 idx++;
5923 }
5924 }
5925out:
5926 rcu_read_unlock();
5927 cb->args[1] = idx;
5928 cb->args[0] = h;
5929
5930 return skb->len;
5931}
5932
5933void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5934{
5935 struct sk_buff *skb;
5936 struct net *net = dev_net(idev->dev);
5937 int err = -ENOBUFS;
5938
5939 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5940 if (!skb)
5941 goto errout;
5942
5943 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5944 if (err < 0) {
5945 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5946 WARN_ON(err == -EMSGSIZE);
5947 kfree_skb(skb);
5948 goto errout;
5949 }
5950 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5951 return;
5952errout:
5953 if (err < 0)
5954 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5955}
5956
5957static inline size_t inet6_prefix_nlmsg_size(void)
5958{
5959 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5960 + nla_total_size(sizeof(struct in6_addr))
5961 + nla_total_size(sizeof(struct prefix_cacheinfo));
5962}
5963
5964static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5965 struct prefix_info *pinfo, u32 portid, u32 seq,
5966 int event, unsigned int flags)
5967{
5968 struct prefixmsg *pmsg;
5969 struct nlmsghdr *nlh;
5970 struct prefix_cacheinfo ci;
5971
5972 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5973 if (!nlh)
5974 return -EMSGSIZE;
5975
5976 pmsg = nlmsg_data(nlh);
5977 pmsg->prefix_family = AF_INET6;
5978 pmsg->prefix_pad1 = 0;
5979 pmsg->prefix_pad2 = 0;
5980 pmsg->prefix_ifindex = idev->dev->ifindex;
5981 pmsg->prefix_len = pinfo->prefix_len;
5982 pmsg->prefix_type = pinfo->type;
5983 pmsg->prefix_pad3 = 0;
5984 pmsg->prefix_flags = 0;
5985 if (pinfo->onlink)
5986 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5987 if (pinfo->autoconf)
5988 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5989
5990 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5991 goto nla_put_failure;
5992 ci.preferred_time = ntohl(pinfo->prefered);
5993 ci.valid_time = ntohl(pinfo->valid);
5994 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5995 goto nla_put_failure;
5996 nlmsg_end(skb, nlh);
5997 return 0;
5998
5999nla_put_failure:
6000 nlmsg_cancel(skb, nlh);
6001 return -EMSGSIZE;
6002}
6003
6004static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6005 struct prefix_info *pinfo)
6006{
6007 struct sk_buff *skb;
6008 struct net *net = dev_net(idev->dev);
6009 int err = -ENOBUFS;
6010
6011 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6012 if (!skb)
6013 goto errout;
6014
6015 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6016 if (err < 0) {
6017 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6018 WARN_ON(err == -EMSGSIZE);
6019 kfree_skb(skb);
6020 goto errout;
6021 }
6022 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6023 return;
6024errout:
6025 if (err < 0)
6026 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6027}
6028
6029static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6030{
6031 struct net *net = dev_net(ifp->idev->dev);
6032
6033 if (event)
6034 ASSERT_RTNL();
6035
6036 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6037
6038 switch (event) {
6039 case RTM_NEWADDR:
6040 /*
6041 * If the address was optimistic we inserted the route at the
6042 * start of our DAD process, so we don't need to do it again.
6043 * If the device was taken down in the middle of the DAD
6044 * cycle there is a race where we could get here without a
6045 * host route, so nothing to insert. That will be fixed when
6046 * the device is brought up.
6047 */
6048 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6049 ip6_ins_rt(net, ifp->rt);
6050 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6051 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6052 &ifp->addr, ifp->idev->dev->name);
6053 }
6054
6055 if (ifp->idev->cnf.forwarding)
6056 addrconf_join_anycast(ifp);
6057 if (!ipv6_addr_any(&ifp->peer_addr))
6058 addrconf_prefix_route(&ifp->peer_addr, 128,
6059 ifp->rt_priority, ifp->idev->dev,
6060 0, 0, GFP_ATOMIC);
6061 break;
6062 case RTM_DELADDR:
6063 if (ifp->idev->cnf.forwarding)
6064 addrconf_leave_anycast(ifp);
6065 addrconf_leave_solict(ifp->idev, &ifp->addr);
6066 if (!ipv6_addr_any(&ifp->peer_addr)) {
6067 struct fib6_info *rt;
6068
6069 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6070 ifp->idev->dev, 0, 0,
6071 false);
6072 if (rt)
6073 ip6_del_rt(net, rt, false);
6074 }
6075 if (ifp->rt) {
6076 ip6_del_rt(net, ifp->rt, false);
6077 ifp->rt = NULL;
6078 }
6079 rt_genid_bump_ipv6(net);
6080 break;
6081 }
6082 atomic_inc(&net->ipv6.dev_addr_genid);
6083}
6084
6085static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6086{
6087 rcu_read_lock_bh();
6088 if (likely(ifp->idev->dead == 0))
6089 __ipv6_ifa_notify(event, ifp);
6090 rcu_read_unlock_bh();
6091}
6092
6093#ifdef CONFIG_SYSCTL
6094
6095static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6096 void *buffer, size_t *lenp, loff_t *ppos)
6097{
6098 int *valp = ctl->data;
6099 int val = *valp;
6100 loff_t pos = *ppos;
6101 struct ctl_table lctl;
6102 int ret;
6103
6104 /*
6105 * ctl->data points to idev->cnf.forwarding, we should
6106 * not modify it until we get the rtnl lock.
6107 */
6108 lctl = *ctl;
6109 lctl.data = &val;
6110
6111 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6112
6113 if (write)
6114 ret = addrconf_fixup_forwarding(ctl, valp, val);
6115 if (ret)
6116 *ppos = pos;
6117 return ret;
6118}
6119
6120static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6121 void *buffer, size_t *lenp, loff_t *ppos)
6122{
6123 struct inet6_dev *idev = ctl->extra1;
6124 int min_mtu = IPV6_MIN_MTU;
6125 struct ctl_table lctl;
6126
6127 lctl = *ctl;
6128 lctl.extra1 = &min_mtu;
6129 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6130
6131 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6132}
6133
6134static void dev_disable_change(struct inet6_dev *idev)
6135{
6136 struct netdev_notifier_info info;
6137
6138 if (!idev || !idev->dev)
6139 return;
6140
6141 netdev_notifier_info_init(&info, idev->dev);
6142 if (idev->cnf.disable_ipv6)
6143 addrconf_notify(NULL, NETDEV_DOWN, &info);
6144 else
6145 addrconf_notify(NULL, NETDEV_UP, &info);
6146}
6147
6148static void addrconf_disable_change(struct net *net, __s32 newf)
6149{
6150 struct net_device *dev;
6151 struct inet6_dev *idev;
6152
6153 for_each_netdev(net, dev) {
6154 idev = __in6_dev_get(dev);
6155 if (idev) {
6156 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6157 idev->cnf.disable_ipv6 = newf;
6158 if (changed)
6159 dev_disable_change(idev);
6160 }
6161 }
6162}
6163
6164static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6165{
6166 struct net *net;
6167 int old;
6168
6169 if (!rtnl_trylock())
6170 return restart_syscall();
6171
6172 net = (struct net *)table->extra2;
6173 old = *p;
6174 *p = newf;
6175
6176 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6177 rtnl_unlock();
6178 return 0;
6179 }
6180
6181 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6182 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6183 addrconf_disable_change(net, newf);
6184 } else if ((!newf) ^ (!old))
6185 dev_disable_change((struct inet6_dev *)table->extra1);
6186
6187 rtnl_unlock();
6188 return 0;
6189}
6190
6191static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6192 void *buffer, size_t *lenp, loff_t *ppos)
6193{
6194 int *valp = ctl->data;
6195 int val = *valp;
6196 loff_t pos = *ppos;
6197 struct ctl_table lctl;
6198 int ret;
6199
6200 /*
6201 * ctl->data points to idev->cnf.disable_ipv6, we should
6202 * not modify it until we get the rtnl lock.
6203 */
6204 lctl = *ctl;
6205 lctl.data = &val;
6206
6207 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6208
6209 if (write)
6210 ret = addrconf_disable_ipv6(ctl, valp, val);
6211 if (ret)
6212 *ppos = pos;
6213 return ret;
6214}
6215
6216static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6217 void *buffer, size_t *lenp, loff_t *ppos)
6218{
6219 int *valp = ctl->data;
6220 int ret;
6221 int old, new;
6222
6223 old = *valp;
6224 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6225 new = *valp;
6226
6227 if (write && old != new) {
6228 struct net *net = ctl->extra2;
6229
6230 if (!rtnl_trylock())
6231 return restart_syscall();
6232
6233 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6234 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6235 NETCONFA_PROXY_NEIGH,
6236 NETCONFA_IFINDEX_DEFAULT,
6237 net->ipv6.devconf_dflt);
6238 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6239 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6240 NETCONFA_PROXY_NEIGH,
6241 NETCONFA_IFINDEX_ALL,
6242 net->ipv6.devconf_all);
6243 else {
6244 struct inet6_dev *idev = ctl->extra1;
6245
6246 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6247 NETCONFA_PROXY_NEIGH,
6248 idev->dev->ifindex,
6249 &idev->cnf);
6250 }
6251 rtnl_unlock();
6252 }
6253
6254 return ret;
6255}
6256
6257static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6258 void *buffer, size_t *lenp,
6259 loff_t *ppos)
6260{
6261 int ret = 0;
6262 u32 new_val;
6263 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6264 struct net *net = (struct net *)ctl->extra2;
6265 struct ctl_table tmp = {
6266 .data = &new_val,
6267 .maxlen = sizeof(new_val),
6268 .mode = ctl->mode,
6269 };
6270
6271 if (!rtnl_trylock())
6272 return restart_syscall();
6273
6274 new_val = *((u32 *)ctl->data);
6275
6276 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6277 if (ret != 0)
6278 goto out;
6279
6280 if (write) {
6281 if (check_addr_gen_mode(new_val) < 0) {
6282 ret = -EINVAL;
6283 goto out;
6284 }
6285
6286 if (idev) {
6287 if (check_stable_privacy(idev, net, new_val) < 0) {
6288 ret = -EINVAL;
6289 goto out;
6290 }
6291
6292 if (idev->cnf.addr_gen_mode != new_val) {
6293 idev->cnf.addr_gen_mode = new_val;
6294 addrconf_dev_config(idev->dev);
6295 }
6296 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6297 struct net_device *dev;
6298
6299 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6300 for_each_netdev(net, dev) {
6301 idev = __in6_dev_get(dev);
6302 if (idev &&
6303 idev->cnf.addr_gen_mode != new_val) {
6304 idev->cnf.addr_gen_mode = new_val;
6305 addrconf_dev_config(idev->dev);
6306 }
6307 }
6308 }
6309
6310 *((u32 *)ctl->data) = new_val;
6311 }
6312
6313out:
6314 rtnl_unlock();
6315
6316 return ret;
6317}
6318
6319static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6320 void *buffer, size_t *lenp,
6321 loff_t *ppos)
6322{
6323 int err;
6324 struct in6_addr addr;
6325 char str[IPV6_MAX_STRLEN];
6326 struct ctl_table lctl = *ctl;
6327 struct net *net = ctl->extra2;
6328 struct ipv6_stable_secret *secret = ctl->data;
6329
6330 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6331 return -EIO;
6332
6333 lctl.maxlen = IPV6_MAX_STRLEN;
6334 lctl.data = str;
6335
6336 if (!rtnl_trylock())
6337 return restart_syscall();
6338
6339 if (!write && !secret->initialized) {
6340 err = -EIO;
6341 goto out;
6342 }
6343
6344 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6345 if (err >= sizeof(str)) {
6346 err = -EIO;
6347 goto out;
6348 }
6349
6350 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6351 if (err || !write)
6352 goto out;
6353
6354 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6355 err = -EIO;
6356 goto out;
6357 }
6358
6359 secret->initialized = true;
6360 secret->secret = addr;
6361
6362 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6363 struct net_device *dev;
6364
6365 for_each_netdev(net, dev) {
6366 struct inet6_dev *idev = __in6_dev_get(dev);
6367
6368 if (idev) {
6369 idev->cnf.addr_gen_mode =
6370 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6371 }
6372 }
6373 } else {
6374 struct inet6_dev *idev = ctl->extra1;
6375
6376 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6377 }
6378
6379out:
6380 rtnl_unlock();
6381
6382 return err;
6383}
6384
6385static
6386int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6387 int write, void *buffer,
6388 size_t *lenp,
6389 loff_t *ppos)
6390{
6391 int *valp = ctl->data;
6392 int val = *valp;
6393 loff_t pos = *ppos;
6394 struct ctl_table lctl;
6395 int ret;
6396
6397 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6398 * we should not modify it until we get the rtnl lock.
6399 */
6400 lctl = *ctl;
6401 lctl.data = &val;
6402
6403 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6404
6405 if (write)
6406 ret = addrconf_fixup_linkdown(ctl, valp, val);
6407 if (ret)
6408 *ppos = pos;
6409 return ret;
6410}
6411
6412static
6413void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6414{
6415 if (rt) {
6416 if (action)
6417 rt->dst.flags |= DST_NOPOLICY;
6418 else
6419 rt->dst.flags &= ~DST_NOPOLICY;
6420 }
6421}
6422
6423static
6424void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6425{
6426 struct inet6_ifaddr *ifa;
6427
6428 read_lock_bh(&idev->lock);
6429 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6430 spin_lock(&ifa->lock);
6431 if (ifa->rt) {
6432 /* host routes only use builtin fib6_nh */
6433 struct fib6_nh *nh = ifa->rt->fib6_nh;
6434 int cpu;
6435
6436 rcu_read_lock();
6437 ifa->rt->dst_nopolicy = val ? true : false;
6438 if (nh->rt6i_pcpu) {
6439 for_each_possible_cpu(cpu) {
6440 struct rt6_info **rtp;
6441
6442 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6443 addrconf_set_nopolicy(*rtp, val);
6444 }
6445 }
6446 rcu_read_unlock();
6447 }
6448 spin_unlock(&ifa->lock);
6449 }
6450 read_unlock_bh(&idev->lock);
6451}
6452
6453static
6454int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6455{
6456 struct inet6_dev *idev;
6457 struct net *net;
6458
6459 if (!rtnl_trylock())
6460 return restart_syscall();
6461
6462 *valp = val;
6463
6464 net = (struct net *)ctl->extra2;
6465 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6466 rtnl_unlock();
6467 return 0;
6468 }
6469
6470 if (valp == &net->ipv6.devconf_all->disable_policy) {
6471 struct net_device *dev;
6472
6473 for_each_netdev(net, dev) {
6474 idev = __in6_dev_get(dev);
6475 if (idev)
6476 addrconf_disable_policy_idev(idev, val);
6477 }
6478 } else {
6479 idev = (struct inet6_dev *)ctl->extra1;
6480 addrconf_disable_policy_idev(idev, val);
6481 }
6482
6483 rtnl_unlock();
6484 return 0;
6485}
6486
6487static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6488 void *buffer, size_t *lenp, loff_t *ppos)
6489{
6490 int *valp = ctl->data;
6491 int val = *valp;
6492 loff_t pos = *ppos;
6493 struct ctl_table lctl;
6494 int ret;
6495
6496 lctl = *ctl;
6497 lctl.data = &val;
6498 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6499
6500 if (write && (*valp != val))
6501 ret = addrconf_disable_policy(ctl, valp, val);
6502
6503 if (ret)
6504 *ppos = pos;
6505
6506 return ret;
6507}
6508
6509static int minus_one = -1;
6510static const int two_five_five = 255;
6511
6512static const struct ctl_table addrconf_sysctl[] = {
6513 {
6514 .procname = "forwarding",
6515 .data = &ipv6_devconf.forwarding,
6516 .maxlen = sizeof(int),
6517 .mode = 0644,
6518 .proc_handler = addrconf_sysctl_forward,
6519 },
6520 {
6521 .procname = "hop_limit",
6522 .data = &ipv6_devconf.hop_limit,
6523 .maxlen = sizeof(int),
6524 .mode = 0644,
6525 .proc_handler = proc_dointvec_minmax,
6526 .extra1 = (void *)SYSCTL_ONE,
6527 .extra2 = (void *)&two_five_five,
6528 },
6529 {
6530 .procname = "mtu",
6531 .data = &ipv6_devconf.mtu6,
6532 .maxlen = sizeof(int),
6533 .mode = 0644,
6534 .proc_handler = addrconf_sysctl_mtu,
6535 },
6536 {
6537 .procname = "accept_ra",
6538 .data = &ipv6_devconf.accept_ra,
6539 .maxlen = sizeof(int),
6540 .mode = 0644,
6541 .proc_handler = proc_dointvec,
6542 },
6543 {
6544 .procname = "accept_redirects",
6545 .data = &ipv6_devconf.accept_redirects,
6546 .maxlen = sizeof(int),
6547 .mode = 0644,
6548 .proc_handler = proc_dointvec,
6549 },
6550 {
6551 .procname = "autoconf",
6552 .data = &ipv6_devconf.autoconf,
6553 .maxlen = sizeof(int),
6554 .mode = 0644,
6555 .proc_handler = proc_dointvec,
6556 },
6557 {
6558 .procname = "dad_transmits",
6559 .data = &ipv6_devconf.dad_transmits,
6560 .maxlen = sizeof(int),
6561 .mode = 0644,
6562 .proc_handler = proc_dointvec,
6563 },
6564 {
6565 .procname = "router_solicitations",
6566 .data = &ipv6_devconf.rtr_solicits,
6567 .maxlen = sizeof(int),
6568 .mode = 0644,
6569 .proc_handler = proc_dointvec_minmax,
6570 .extra1 = &minus_one,
6571 },
6572 {
6573 .procname = "router_solicitation_interval",
6574 .data = &ipv6_devconf.rtr_solicit_interval,
6575 .maxlen = sizeof(int),
6576 .mode = 0644,
6577 .proc_handler = proc_dointvec_jiffies,
6578 },
6579 {
6580 .procname = "router_solicitation_max_interval",
6581 .data = &ipv6_devconf.rtr_solicit_max_interval,
6582 .maxlen = sizeof(int),
6583 .mode = 0644,
6584 .proc_handler = proc_dointvec_jiffies,
6585 },
6586 {
6587 .procname = "router_solicitation_delay",
6588 .data = &ipv6_devconf.rtr_solicit_delay,
6589 .maxlen = sizeof(int),
6590 .mode = 0644,
6591 .proc_handler = proc_dointvec_jiffies,
6592 },
6593 {
6594 .procname = "force_mld_version",
6595 .data = &ipv6_devconf.force_mld_version,
6596 .maxlen = sizeof(int),
6597 .mode = 0644,
6598 .proc_handler = proc_dointvec,
6599 },
6600 {
6601 .procname = "mldv1_unsolicited_report_interval",
6602 .data =
6603 &ipv6_devconf.mldv1_unsolicited_report_interval,
6604 .maxlen = sizeof(int),
6605 .mode = 0644,
6606 .proc_handler = proc_dointvec_ms_jiffies,
6607 },
6608 {
6609 .procname = "mldv2_unsolicited_report_interval",
6610 .data =
6611 &ipv6_devconf.mldv2_unsolicited_report_interval,
6612 .maxlen = sizeof(int),
6613 .mode = 0644,
6614 .proc_handler = proc_dointvec_ms_jiffies,
6615 },
6616 {
6617 .procname = "use_tempaddr",
6618 .data = &ipv6_devconf.use_tempaddr,
6619 .maxlen = sizeof(int),
6620 .mode = 0644,
6621 .proc_handler = proc_dointvec,
6622 },
6623 {
6624 .procname = "temp_valid_lft",
6625 .data = &ipv6_devconf.temp_valid_lft,
6626 .maxlen = sizeof(int),
6627 .mode = 0644,
6628 .proc_handler = proc_dointvec,
6629 },
6630 {
6631 .procname = "temp_prefered_lft",
6632 .data = &ipv6_devconf.temp_prefered_lft,
6633 .maxlen = sizeof(int),
6634 .mode = 0644,
6635 .proc_handler = proc_dointvec,
6636 },
6637 {
6638 .procname = "regen_max_retry",
6639 .data = &ipv6_devconf.regen_max_retry,
6640 .maxlen = sizeof(int),
6641 .mode = 0644,
6642 .proc_handler = proc_dointvec,
6643 },
6644 {
6645 .procname = "max_desync_factor",
6646 .data = &ipv6_devconf.max_desync_factor,
6647 .maxlen = sizeof(int),
6648 .mode = 0644,
6649 .proc_handler = proc_dointvec,
6650 },
6651 {
6652 .procname = "max_addresses",
6653 .data = &ipv6_devconf.max_addresses,
6654 .maxlen = sizeof(int),
6655 .mode = 0644,
6656 .proc_handler = proc_dointvec,
6657 },
6658 {
6659 .procname = "accept_ra_defrtr",
6660 .data = &ipv6_devconf.accept_ra_defrtr,
6661 .maxlen = sizeof(int),
6662 .mode = 0644,
6663 .proc_handler = proc_dointvec,
6664 },
6665 {
6666 .procname = "accept_ra_min_hop_limit",
6667 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6668 .maxlen = sizeof(int),
6669 .mode = 0644,
6670 .proc_handler = proc_dointvec,
6671 },
6672 {
6673 .procname = "accept_ra_pinfo",
6674 .data = &ipv6_devconf.accept_ra_pinfo,
6675 .maxlen = sizeof(int),
6676 .mode = 0644,
6677 .proc_handler = proc_dointvec,
6678 },
6679#ifdef CONFIG_IPV6_ROUTER_PREF
6680 {
6681 .procname = "accept_ra_rtr_pref",
6682 .data = &ipv6_devconf.accept_ra_rtr_pref,
6683 .maxlen = sizeof(int),
6684 .mode = 0644,
6685 .proc_handler = proc_dointvec,
6686 },
6687 {
6688 .procname = "router_probe_interval",
6689 .data = &ipv6_devconf.rtr_probe_interval,
6690 .maxlen = sizeof(int),
6691 .mode = 0644,
6692 .proc_handler = proc_dointvec_jiffies,
6693 },
6694#ifdef CONFIG_IPV6_ROUTE_INFO
6695 {
6696 .procname = "accept_ra_rt_info_min_plen",
6697 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6698 .maxlen = sizeof(int),
6699 .mode = 0644,
6700 .proc_handler = proc_dointvec,
6701 },
6702 {
6703 .procname = "accept_ra_rt_info_max_plen",
6704 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6705 .maxlen = sizeof(int),
6706 .mode = 0644,
6707 .proc_handler = proc_dointvec,
6708 },
6709#endif
6710#endif
6711 {
6712 .procname = "proxy_ndp",
6713 .data = &ipv6_devconf.proxy_ndp,
6714 .maxlen = sizeof(int),
6715 .mode = 0644,
6716 .proc_handler = addrconf_sysctl_proxy_ndp,
6717 },
6718 {
6719 .procname = "accept_source_route",
6720 .data = &ipv6_devconf.accept_source_route,
6721 .maxlen = sizeof(int),
6722 .mode = 0644,
6723 .proc_handler = proc_dointvec,
6724 },
6725#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6726 {
6727 .procname = "optimistic_dad",
6728 .data = &ipv6_devconf.optimistic_dad,
6729 .maxlen = sizeof(int),
6730 .mode = 0644,
6731 .proc_handler = proc_dointvec,
6732 },
6733 {
6734 .procname = "use_optimistic",
6735 .data = &ipv6_devconf.use_optimistic,
6736 .maxlen = sizeof(int),
6737 .mode = 0644,
6738 .proc_handler = proc_dointvec,
6739 },
6740#endif
6741#ifdef CONFIG_IPV6_MROUTE
6742 {
6743 .procname = "mc_forwarding",
6744 .data = &ipv6_devconf.mc_forwarding,
6745 .maxlen = sizeof(int),
6746 .mode = 0444,
6747 .proc_handler = proc_dointvec,
6748 },
6749#endif
6750 {
6751 .procname = "disable_ipv6",
6752 .data = &ipv6_devconf.disable_ipv6,
6753 .maxlen = sizeof(int),
6754 .mode = 0644,
6755 .proc_handler = addrconf_sysctl_disable,
6756 },
6757 {
6758 .procname = "accept_dad",
6759 .data = &ipv6_devconf.accept_dad,
6760 .maxlen = sizeof(int),
6761 .mode = 0644,
6762 .proc_handler = proc_dointvec,
6763 },
6764 {
6765 .procname = "force_tllao",
6766 .data = &ipv6_devconf.force_tllao,
6767 .maxlen = sizeof(int),
6768 .mode = 0644,
6769 .proc_handler = proc_dointvec
6770 },
6771 {
6772 .procname = "ndisc_notify",
6773 .data = &ipv6_devconf.ndisc_notify,
6774 .maxlen = sizeof(int),
6775 .mode = 0644,
6776 .proc_handler = proc_dointvec
6777 },
6778 {
6779 .procname = "suppress_frag_ndisc",
6780 .data = &ipv6_devconf.suppress_frag_ndisc,
6781 .maxlen = sizeof(int),
6782 .mode = 0644,
6783 .proc_handler = proc_dointvec
6784 },
6785 {
6786 .procname = "accept_ra_from_local",
6787 .data = &ipv6_devconf.accept_ra_from_local,
6788 .maxlen = sizeof(int),
6789 .mode = 0644,
6790 .proc_handler = proc_dointvec,
6791 },
6792 {
6793 .procname = "accept_ra_mtu",
6794 .data = &ipv6_devconf.accept_ra_mtu,
6795 .maxlen = sizeof(int),
6796 .mode = 0644,
6797 .proc_handler = proc_dointvec,
6798 },
6799 {
6800 .procname = "stable_secret",
6801 .data = &ipv6_devconf.stable_secret,
6802 .maxlen = IPV6_MAX_STRLEN,
6803 .mode = 0600,
6804 .proc_handler = addrconf_sysctl_stable_secret,
6805 },
6806 {
6807 .procname = "use_oif_addrs_only",
6808 .data = &ipv6_devconf.use_oif_addrs_only,
6809 .maxlen = sizeof(int),
6810 .mode = 0644,
6811 .proc_handler = proc_dointvec,
6812 },
6813 {
6814 .procname = "ignore_routes_with_linkdown",
6815 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6816 .maxlen = sizeof(int),
6817 .mode = 0644,
6818 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6819 },
6820 {
6821 .procname = "drop_unicast_in_l2_multicast",
6822 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6823 .maxlen = sizeof(int),
6824 .mode = 0644,
6825 .proc_handler = proc_dointvec,
6826 },
6827 {
6828 .procname = "drop_unsolicited_na",
6829 .data = &ipv6_devconf.drop_unsolicited_na,
6830 .maxlen = sizeof(int),
6831 .mode = 0644,
6832 .proc_handler = proc_dointvec,
6833 },
6834 {
6835 .procname = "keep_addr_on_down",
6836 .data = &ipv6_devconf.keep_addr_on_down,
6837 .maxlen = sizeof(int),
6838 .mode = 0644,
6839 .proc_handler = proc_dointvec,
6840
6841 },
6842 {
6843 .procname = "seg6_enabled",
6844 .data = &ipv6_devconf.seg6_enabled,
6845 .maxlen = sizeof(int),
6846 .mode = 0644,
6847 .proc_handler = proc_dointvec,
6848 },
6849#ifdef CONFIG_IPV6_SEG6_HMAC
6850 {
6851 .procname = "seg6_require_hmac",
6852 .data = &ipv6_devconf.seg6_require_hmac,
6853 .maxlen = sizeof(int),
6854 .mode = 0644,
6855 .proc_handler = proc_dointvec,
6856 },
6857#endif
6858 {
6859 .procname = "enhanced_dad",
6860 .data = &ipv6_devconf.enhanced_dad,
6861 .maxlen = sizeof(int),
6862 .mode = 0644,
6863 .proc_handler = proc_dointvec,
6864 },
6865 {
6866 .procname = "addr_gen_mode",
6867 .data = &ipv6_devconf.addr_gen_mode,
6868 .maxlen = sizeof(int),
6869 .mode = 0644,
6870 .proc_handler = addrconf_sysctl_addr_gen_mode,
6871 },
6872 {
6873 .procname = "disable_policy",
6874 .data = &ipv6_devconf.disable_policy,
6875 .maxlen = sizeof(int),
6876 .mode = 0644,
6877 .proc_handler = addrconf_sysctl_disable_policy,
6878 },
6879 {
6880 .procname = "ndisc_tclass",
6881 .data = &ipv6_devconf.ndisc_tclass,
6882 .maxlen = sizeof(int),
6883 .mode = 0644,
6884 .proc_handler = proc_dointvec_minmax,
6885 .extra1 = (void *)SYSCTL_ZERO,
6886 .extra2 = (void *)&two_five_five,
6887 },
6888 {
6889 .procname = "rpl_seg_enabled",
6890 .data = &ipv6_devconf.rpl_seg_enabled,
6891 .maxlen = sizeof(int),
6892 .mode = 0644,
6893 .proc_handler = proc_dointvec,
6894 },
6895 {
6896 /* sentinel */
6897 }
6898};
6899
6900static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6901 struct inet6_dev *idev, struct ipv6_devconf *p)
6902{
6903 int i, ifindex;
6904 struct ctl_table *table;
6905 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6906
6907 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6908 if (!table)
6909 goto out;
6910
6911 for (i = 0; table[i].data; i++) {
6912 table[i].data += (char *)p - (char *)&ipv6_devconf;
6913 /* If one of these is already set, then it is not safe to
6914 * overwrite either of them: this makes proc_dointvec_minmax
6915 * usable.
6916 */
6917 if (!table[i].extra1 && !table[i].extra2) {
6918 table[i].extra1 = idev; /* embedded; no ref */
6919 table[i].extra2 = net;
6920 }
6921 }
6922
6923 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6924
6925 p->sysctl_header = register_net_sysctl(net, path, table);
6926 if (!p->sysctl_header)
6927 goto free;
6928
6929 if (!strcmp(dev_name, "all"))
6930 ifindex = NETCONFA_IFINDEX_ALL;
6931 else if (!strcmp(dev_name, "default"))
6932 ifindex = NETCONFA_IFINDEX_DEFAULT;
6933 else
6934 ifindex = idev->dev->ifindex;
6935 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6936 ifindex, p);
6937 return 0;
6938
6939free:
6940 kfree(table);
6941out:
6942 return -ENOBUFS;
6943}
6944
6945static void __addrconf_sysctl_unregister(struct net *net,
6946 struct ipv6_devconf *p, int ifindex)
6947{
6948 struct ctl_table *table;
6949
6950 if (!p->sysctl_header)
6951 return;
6952
6953 table = p->sysctl_header->ctl_table_arg;
6954 unregister_net_sysctl_table(p->sysctl_header);
6955 p->sysctl_header = NULL;
6956 kfree(table);
6957
6958 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6959}
6960
6961static int addrconf_sysctl_register(struct inet6_dev *idev)
6962{
6963 int err;
6964
6965 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6966 return -EINVAL;
6967
6968 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6969 &ndisc_ifinfo_sysctl_change);
6970 if (err)
6971 return err;
6972 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6973 idev, &idev->cnf);
6974 if (err)
6975 neigh_sysctl_unregister(idev->nd_parms);
6976
6977 return err;
6978}
6979
6980static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6981{
6982 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6983 idev->dev->ifindex);
6984 neigh_sysctl_unregister(idev->nd_parms);
6985}
6986
6987
6988#endif
6989
6990static int __net_init addrconf_init_net(struct net *net)
6991{
6992 int err = -ENOMEM;
6993 struct ipv6_devconf *all, *dflt;
6994
6995 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6996 if (!all)
6997 goto err_alloc_all;
6998
6999 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7000 if (!dflt)
7001 goto err_alloc_dflt;
7002
7003 if (IS_ENABLED(CONFIG_SYSCTL) &&
7004 !net_eq(net, &init_net)) {
7005 switch (sysctl_devconf_inherit_init_net) {
7006 case 1: /* copy from init_net */
7007 memcpy(all, init_net.ipv6.devconf_all,
7008 sizeof(ipv6_devconf));
7009 memcpy(dflt, init_net.ipv6.devconf_dflt,
7010 sizeof(ipv6_devconf_dflt));
7011 break;
7012 case 3: /* copy from the current netns */
7013 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7014 sizeof(ipv6_devconf));
7015 memcpy(dflt,
7016 current->nsproxy->net_ns->ipv6.devconf_dflt,
7017 sizeof(ipv6_devconf_dflt));
7018 break;
7019 case 0:
7020 case 2:
7021 /* use compiled values */
7022 break;
7023 }
7024 }
7025
7026 /* these will be inherited by all namespaces */
7027 dflt->autoconf = ipv6_defaults.autoconf;
7028 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7029
7030 dflt->stable_secret.initialized = false;
7031 all->stable_secret.initialized = false;
7032
7033 net->ipv6.devconf_all = all;
7034 net->ipv6.devconf_dflt = dflt;
7035
7036#ifdef CONFIG_SYSCTL
7037 err = __addrconf_sysctl_register(net, "all", NULL, all);
7038 if (err < 0)
7039 goto err_reg_all;
7040
7041 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7042 if (err < 0)
7043 goto err_reg_dflt;
7044#endif
7045 return 0;
7046
7047#ifdef CONFIG_SYSCTL
7048err_reg_dflt:
7049 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7050err_reg_all:
7051 kfree(dflt);
7052#endif
7053err_alloc_dflt:
7054 kfree(all);
7055err_alloc_all:
7056 return err;
7057}
7058
7059static void __net_exit addrconf_exit_net(struct net *net)
7060{
7061#ifdef CONFIG_SYSCTL
7062 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7063 NETCONFA_IFINDEX_DEFAULT);
7064 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7065 NETCONFA_IFINDEX_ALL);
7066#endif
7067 kfree(net->ipv6.devconf_dflt);
7068 kfree(net->ipv6.devconf_all);
7069}
7070
7071static struct pernet_operations addrconf_ops = {
7072 .init = addrconf_init_net,
7073 .exit = addrconf_exit_net,
7074};
7075
7076static struct rtnl_af_ops inet6_ops __read_mostly = {
7077 .family = AF_INET6,
7078 .fill_link_af = inet6_fill_link_af,
7079 .get_link_af_size = inet6_get_link_af_size,
7080 .validate_link_af = inet6_validate_link_af,
7081 .set_link_af = inet6_set_link_af,
7082};
7083
7084/*
7085 * Init / cleanup code
7086 */
7087
7088int __init addrconf_init(void)
7089{
7090 struct inet6_dev *idev;
7091 int i, err;
7092
7093 err = ipv6_addr_label_init();
7094 if (err < 0) {
7095 pr_crit("%s: cannot initialize default policy table: %d\n",
7096 __func__, err);
7097 goto out;
7098 }
7099
7100 err = register_pernet_subsys(&addrconf_ops);
7101 if (err < 0)
7102 goto out_addrlabel;
7103
7104 addrconf_wq = create_workqueue("ipv6_addrconf");
7105 if (!addrconf_wq) {
7106 err = -ENOMEM;
7107 goto out_nowq;
7108 }
7109
7110 /* The addrconf netdev notifier requires that loopback_dev
7111 * has it's ipv6 private information allocated and setup
7112 * before it can bring up and give link-local addresses
7113 * to other devices which are up.
7114 *
7115 * Unfortunately, loopback_dev is not necessarily the first
7116 * entry in the global dev_base list of net devices. In fact,
7117 * it is likely to be the very last entry on that list.
7118 * So this causes the notifier registry below to try and
7119 * give link-local addresses to all devices besides loopback_dev
7120 * first, then loopback_dev, which cases all the non-loopback_dev
7121 * devices to fail to get a link-local address.
7122 *
7123 * So, as a temporary fix, allocate the ipv6 structure for
7124 * loopback_dev first by hand.
7125 * Longer term, all of the dependencies ipv6 has upon the loopback
7126 * device and it being up should be removed.
7127 */
7128 rtnl_lock();
7129 idev = ipv6_add_dev(init_net.loopback_dev);
7130 rtnl_unlock();
7131 if (IS_ERR(idev)) {
7132 err = PTR_ERR(idev);
7133 goto errlo;
7134 }
7135
7136 ip6_route_init_special_entries();
7137
7138 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7139 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7140
7141 register_netdevice_notifier(&ipv6_dev_notf);
7142
7143 addrconf_verify();
7144
7145 rtnl_af_register(&inet6_ops);
7146
7147 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7148 NULL, inet6_dump_ifinfo, 0);
7149 if (err < 0)
7150 goto errout;
7151
7152 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7153 inet6_rtm_newaddr, NULL, 0);
7154 if (err < 0)
7155 goto errout;
7156 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7157 inet6_rtm_deladdr, NULL, 0);
7158 if (err < 0)
7159 goto errout;
7160 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7161 inet6_rtm_getaddr, inet6_dump_ifaddr,
7162 RTNL_FLAG_DOIT_UNLOCKED);
7163 if (err < 0)
7164 goto errout;
7165 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7166 NULL, inet6_dump_ifmcaddr, 0);
7167 if (err < 0)
7168 goto errout;
7169 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7170 NULL, inet6_dump_ifacaddr, 0);
7171 if (err < 0)
7172 goto errout;
7173 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7174 inet6_netconf_get_devconf,
7175 inet6_netconf_dump_devconf,
7176 RTNL_FLAG_DOIT_UNLOCKED);
7177 if (err < 0)
7178 goto errout;
7179 err = ipv6_addr_label_rtnl_register();
7180 if (err < 0)
7181 goto errout;
7182
7183 return 0;
7184errout:
7185 rtnl_unregister_all(PF_INET6);
7186 rtnl_af_unregister(&inet6_ops);
7187 unregister_netdevice_notifier(&ipv6_dev_notf);
7188errlo:
7189 destroy_workqueue(addrconf_wq);
7190out_nowq:
7191 unregister_pernet_subsys(&addrconf_ops);
7192out_addrlabel:
7193 ipv6_addr_label_cleanup();
7194out:
7195 return err;
7196}
7197
7198void addrconf_cleanup(void)
7199{
7200 struct net_device *dev;
7201 int i;
7202
7203 unregister_netdevice_notifier(&ipv6_dev_notf);
7204 unregister_pernet_subsys(&addrconf_ops);
7205 ipv6_addr_label_cleanup();
7206
7207 rtnl_af_unregister(&inet6_ops);
7208
7209 rtnl_lock();
7210
7211 /* clean dev list */
7212 for_each_netdev(&init_net, dev) {
7213 if (__in6_dev_get(dev) == NULL)
7214 continue;
7215 addrconf_ifdown(dev, true);
7216 }
7217 addrconf_ifdown(init_net.loopback_dev, true);
7218
7219 /*
7220 * Check hash table.
7221 */
7222 spin_lock_bh(&addrconf_hash_lock);
7223 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7224 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7225 spin_unlock_bh(&addrconf_hash_lock);
7226 cancel_delayed_work(&addr_chk_work);
7227 rtnl_unlock();
7228
7229 destroy_workqueue(addrconf_wq);
7230}