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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/*
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/in6.h>
50#include <linux/netdevice.h>
51#include <linux/if_addr.h>
52#include <linux/if_arp.h>
53#include <linux/if_arcnet.h>
54#include <linux/if_infiniband.h>
55#include <linux/route.h>
56#include <linux/inetdevice.h>
57#include <linux/init.h>
58#include <linux/slab.h>
59#ifdef CONFIG_SYSCTL
60#include <linux/sysctl.h>
61#endif
62#include <linux/capability.h>
63#include <linux/delay.h>
64#include <linux/notifier.h>
65#include <linux/string.h>
66
67#include <net/net_namespace.h>
68#include <net/sock.h>
69#include <net/snmp.h>
70
71#include <net/af_ieee802154.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 <linux/if_tunnel.h>
82#include <linux/rtnetlink.h>
83
84#ifdef CONFIG_IPV6_PRIVACY
85#include <linux/random.h>
86#endif
87
88#include <linux/uaccess.h>
89#include <asm/unaligned.h>
90
91#include <linux/proc_fs.h>
92#include <linux/seq_file.h>
93#include <linux/export.h>
94
95/* Set to 3 to get tracing... */
96#define ACONF_DEBUG 2
97
98#if ACONF_DEBUG >= 3
99#define ADBG(x) printk x
100#else
101#define ADBG(x)
102#endif
103
104#define INFINITY_LIFE_TIME 0xFFFFFFFF
105
106static inline u32 cstamp_delta(unsigned long cstamp)
107{
108 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
109}
110
111#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
112#define ADDRCONF_TIMER_FUZZ (HZ / 4)
113#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
114
115#ifdef CONFIG_SYSCTL
116static void addrconf_sysctl_register(struct inet6_dev *idev);
117static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118#else
119static inline void addrconf_sysctl_register(struct inet6_dev *idev)
120{
121}
122
123static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
124{
125}
126#endif
127
128#ifdef CONFIG_IPV6_PRIVACY
129static int __ipv6_regen_rndid(struct inet6_dev *idev);
130static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
131static void ipv6_regen_rndid(unsigned long data);
132#endif
133
134static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
135static int ipv6_count_addresses(struct inet6_dev *idev);
136
137/*
138 * Configured unicast address hash table
139 */
140static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
141static DEFINE_SPINLOCK(addrconf_hash_lock);
142
143static void addrconf_verify(unsigned long);
144
145static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
146static DEFINE_SPINLOCK(addrconf_verify_lock);
147
148static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
149static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
150
151static void addrconf_type_change(struct net_device *dev,
152 unsigned long event);
153static int addrconf_ifdown(struct net_device *dev, int how);
154
155static void addrconf_dad_start(struct inet6_ifaddr *ifp);
156static void addrconf_dad_timer(unsigned long data);
157static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
158static void addrconf_dad_run(struct inet6_dev *idev);
159static void addrconf_rs_timer(unsigned long data);
160static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
161static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
162
163static void inet6_prefix_notify(int event, struct inet6_dev *idev,
164 struct prefix_info *pinfo);
165static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
166 struct net_device *dev);
167
168static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
169
170static struct ipv6_devconf ipv6_devconf __read_mostly = {
171 .forwarding = 0,
172 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
173 .mtu6 = IPV6_MIN_MTU,
174 .accept_ra = 1,
175 .accept_redirects = 1,
176 .autoconf = 1,
177 .force_mld_version = 0,
178 .dad_transmits = 1,
179 .rtr_solicits = MAX_RTR_SOLICITATIONS,
180 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
181 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
182#ifdef CONFIG_IPV6_PRIVACY
183 .use_tempaddr = 0,
184 .temp_valid_lft = TEMP_VALID_LIFETIME,
185 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
186 .regen_max_retry = REGEN_MAX_RETRY,
187 .max_desync_factor = MAX_DESYNC_FACTOR,
188#endif
189 .max_addresses = IPV6_MAX_ADDRESSES,
190 .accept_ra_defrtr = 1,
191 .accept_ra_pinfo = 1,
192#ifdef CONFIG_IPV6_ROUTER_PREF
193 .accept_ra_rtr_pref = 1,
194 .rtr_probe_interval = 60 * HZ,
195#ifdef CONFIG_IPV6_ROUTE_INFO
196 .accept_ra_rt_info_max_plen = 0,
197#endif
198#endif
199 .proxy_ndp = 0,
200 .accept_source_route = 0, /* we do not accept RH0 by default. */
201 .disable_ipv6 = 0,
202 .accept_dad = 1,
203};
204
205static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
206 .forwarding = 0,
207 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
208 .mtu6 = IPV6_MIN_MTU,
209 .accept_ra = 1,
210 .accept_redirects = 1,
211 .autoconf = 1,
212 .dad_transmits = 1,
213 .rtr_solicits = MAX_RTR_SOLICITATIONS,
214 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
215 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
216#ifdef CONFIG_IPV6_PRIVACY
217 .use_tempaddr = 0,
218 .temp_valid_lft = TEMP_VALID_LIFETIME,
219 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
220 .regen_max_retry = REGEN_MAX_RETRY,
221 .max_desync_factor = MAX_DESYNC_FACTOR,
222#endif
223 .max_addresses = IPV6_MAX_ADDRESSES,
224 .accept_ra_defrtr = 1,
225 .accept_ra_pinfo = 1,
226#ifdef CONFIG_IPV6_ROUTER_PREF
227 .accept_ra_rtr_pref = 1,
228 .rtr_probe_interval = 60 * HZ,
229#ifdef CONFIG_IPV6_ROUTE_INFO
230 .accept_ra_rt_info_max_plen = 0,
231#endif
232#endif
233 .proxy_ndp = 0,
234 .accept_source_route = 0, /* we do not accept RH0 by default. */
235 .disable_ipv6 = 0,
236 .accept_dad = 1,
237};
238
239/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
240const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
241const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
242const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
243const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
244
245/* Check if a valid qdisc is available */
246static inline bool addrconf_qdisc_ok(const struct net_device *dev)
247{
248 return !qdisc_tx_is_noop(dev);
249}
250
251/* Check if a route is valid prefix route */
252static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
253{
254 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
255}
256
257static void addrconf_del_timer(struct inet6_ifaddr *ifp)
258{
259 if (del_timer(&ifp->timer))
260 __in6_ifa_put(ifp);
261}
262
263enum addrconf_timer_t {
264 AC_NONE,
265 AC_DAD,
266 AC_RS,
267};
268
269static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
270 enum addrconf_timer_t what,
271 unsigned long when)
272{
273 if (!del_timer(&ifp->timer))
274 in6_ifa_hold(ifp);
275
276 switch (what) {
277 case AC_DAD:
278 ifp->timer.function = addrconf_dad_timer;
279 break;
280 case AC_RS:
281 ifp->timer.function = addrconf_rs_timer;
282 break;
283 default:
284 break;
285 }
286 ifp->timer.expires = jiffies + when;
287 add_timer(&ifp->timer);
288}
289
290static int snmp6_alloc_dev(struct inet6_dev *idev)
291{
292 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
293 sizeof(struct ipstats_mib),
294 __alignof__(struct ipstats_mib)) < 0)
295 goto err_ip;
296 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6dev)
299 goto err_icmp;
300 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
301 GFP_KERNEL);
302 if (!idev->stats.icmpv6msgdev)
303 goto err_icmpmsg;
304
305 return 0;
306
307err_icmpmsg:
308 kfree(idev->stats.icmpv6dev);
309err_icmp:
310 snmp_mib_free((void __percpu **)idev->stats.ipv6);
311err_ip:
312 return -ENOMEM;
313}
314
315static void snmp6_free_dev(struct inet6_dev *idev)
316{
317 kfree(idev->stats.icmpv6msgdev);
318 kfree(idev->stats.icmpv6dev);
319 snmp_mib_free((void __percpu **)idev->stats.ipv6);
320}
321
322/* Nobody refers to this device, we may destroy it. */
323
324void in6_dev_finish_destroy(struct inet6_dev *idev)
325{
326 struct net_device *dev = idev->dev;
327
328 WARN_ON(!list_empty(&idev->addr_list));
329 WARN_ON(idev->mc_list != NULL);
330
331#ifdef NET_REFCNT_DEBUG
332 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
333#endif
334 dev_put(dev);
335 if (!idev->dead) {
336 pr_warn("Freeing alive inet6 device %p\n", idev);
337 return;
338 }
339 snmp6_free_dev(idev);
340 kfree_rcu(idev, rcu);
341}
342EXPORT_SYMBOL(in6_dev_finish_destroy);
343
344static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
345{
346 struct inet6_dev *ndev;
347
348 ASSERT_RTNL();
349
350 if (dev->mtu < IPV6_MIN_MTU)
351 return NULL;
352
353 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
354
355 if (ndev == NULL)
356 return NULL;
357
358 rwlock_init(&ndev->lock);
359 ndev->dev = dev;
360 INIT_LIST_HEAD(&ndev->addr_list);
361
362 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
363 ndev->cnf.mtu6 = dev->mtu;
364 ndev->cnf.sysctl = NULL;
365 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
366 if (ndev->nd_parms == NULL) {
367 kfree(ndev);
368 return NULL;
369 }
370 if (ndev->cnf.forwarding)
371 dev_disable_lro(dev);
372 /* We refer to the device */
373 dev_hold(dev);
374
375 if (snmp6_alloc_dev(ndev) < 0) {
376 ADBG((KERN_WARNING
377 "%s: cannot allocate memory for statistics; dev=%s.\n",
378 __func__, dev->name));
379 neigh_parms_release(&nd_tbl, ndev->nd_parms);
380 dev_put(dev);
381 kfree(ndev);
382 return NULL;
383 }
384
385 if (snmp6_register_dev(ndev) < 0) {
386 ADBG((KERN_WARNING
387 "%s: cannot create /proc/net/dev_snmp6/%s\n",
388 __func__, dev->name));
389 neigh_parms_release(&nd_tbl, ndev->nd_parms);
390 ndev->dead = 1;
391 in6_dev_finish_destroy(ndev);
392 return NULL;
393 }
394
395 /* One reference from device. We must do this before
396 * we invoke __ipv6_regen_rndid().
397 */
398 in6_dev_hold(ndev);
399
400 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
401 ndev->cnf.accept_dad = -1;
402
403#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
404 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
405 pr_info("%s: Disabled Multicast RS\n", dev->name);
406 ndev->cnf.rtr_solicits = 0;
407 }
408#endif
409
410#ifdef CONFIG_IPV6_PRIVACY
411 INIT_LIST_HEAD(&ndev->tempaddr_list);
412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
415 dev->type == ARPHRD_TUNNEL6 ||
416 dev->type == ARPHRD_SIT ||
417 dev->type == ARPHRD_NONE) {
418 ndev->cnf.use_tempaddr = -1;
419 } else {
420 in6_dev_hold(ndev);
421 ipv6_regen_rndid((unsigned long) ndev);
422 }
423#endif
424
425 if (netif_running(dev) && addrconf_qdisc_ok(dev))
426 ndev->if_flags |= IF_READY;
427
428 ipv6_mc_init_dev(ndev);
429 ndev->tstamp = jiffies;
430 addrconf_sysctl_register(ndev);
431 /* protected by rtnl_lock */
432 rcu_assign_pointer(dev->ip6_ptr, ndev);
433
434 /* Join all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
436
437 /* Join all-router multicast group if forwarding is set */
438 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
440
441 return ndev;
442}
443
444static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
445{
446 struct inet6_dev *idev;
447
448 ASSERT_RTNL();
449
450 idev = __in6_dev_get(dev);
451 if (!idev) {
452 idev = ipv6_add_dev(dev);
453 if (!idev)
454 return NULL;
455 }
456
457 if (dev->flags&IFF_UP)
458 ipv6_mc_up(idev);
459 return idev;
460}
461
462#ifdef CONFIG_SYSCTL
463static void dev_forward_change(struct inet6_dev *idev)
464{
465 struct net_device *dev;
466 struct inet6_ifaddr *ifa;
467
468 if (!idev)
469 return;
470 dev = idev->dev;
471 if (idev->cnf.forwarding)
472 dev_disable_lro(dev);
473 if (dev && (dev->flags & IFF_MULTICAST)) {
474 if (idev->cnf.forwarding)
475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
476 else
477 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
478 }
479
480 list_for_each_entry(ifa, &idev->addr_list, if_list) {
481 if (ifa->flags&IFA_F_TENTATIVE)
482 continue;
483 if (idev->cnf.forwarding)
484 addrconf_join_anycast(ifa);
485 else
486 addrconf_leave_anycast(ifa);
487 }
488}
489
490
491static void addrconf_forward_change(struct net *net, __s32 newf)
492{
493 struct net_device *dev;
494 struct inet6_dev *idev;
495
496 for_each_netdev(net, dev) {
497 idev = __in6_dev_get(dev);
498 if (idev) {
499 int changed = (!idev->cnf.forwarding) ^ (!newf);
500 idev->cnf.forwarding = newf;
501 if (changed)
502 dev_forward_change(idev);
503 }
504 }
505}
506
507static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
508{
509 struct net *net;
510 int old;
511
512 if (!rtnl_trylock())
513 return restart_syscall();
514
515 net = (struct net *)table->extra2;
516 old = *p;
517 *p = newf;
518
519 if (p == &net->ipv6.devconf_dflt->forwarding) {
520 rtnl_unlock();
521 return 0;
522 }
523
524 if (p == &net->ipv6.devconf_all->forwarding) {
525 net->ipv6.devconf_dflt->forwarding = newf;
526 addrconf_forward_change(net, newf);
527 } else if ((!newf) ^ (!old))
528 dev_forward_change((struct inet6_dev *)table->extra1);
529 rtnl_unlock();
530
531 if (newf)
532 rt6_purge_dflt_routers(net);
533 return 1;
534}
535#endif
536
537/* Nobody refers to this ifaddr, destroy it */
538void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
539{
540 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
541
542#ifdef NET_REFCNT_DEBUG
543 pr_debug("%s\n", __func__);
544#endif
545
546 in6_dev_put(ifp->idev);
547
548 if (del_timer(&ifp->timer))
549 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
550
551 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
552 pr_warn("Freeing alive inet6 address %p\n", ifp);
553 return;
554 }
555 dst_release(&ifp->rt->dst);
556
557 kfree_rcu(ifp, rcu);
558}
559
560static void
561ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
562{
563 struct list_head *p;
564 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
565
566 /*
567 * Each device address list is sorted in order of scope -
568 * global before linklocal.
569 */
570 list_for_each(p, &idev->addr_list) {
571 struct inet6_ifaddr *ifa
572 = list_entry(p, struct inet6_ifaddr, if_list);
573 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
574 break;
575 }
576
577 list_add_tail(&ifp->if_list, p);
578}
579
580static u32 ipv6_addr_hash(const struct in6_addr *addr)
581{
582 /*
583 * We perform the hash function over the last 64 bits of the address
584 * This will include the IEEE address token on links that support it.
585 */
586 return jhash_2words((__force u32)addr->s6_addr32[2],
587 (__force u32)addr->s6_addr32[3], 0)
588 & (IN6_ADDR_HSIZE - 1);
589}
590
591/* On success it returns ifp with increased reference count */
592
593static struct inet6_ifaddr *
594ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
595 int scope, u32 flags)
596{
597 struct inet6_ifaddr *ifa = NULL;
598 struct rt6_info *rt;
599 unsigned int hash;
600 int err = 0;
601 int addr_type = ipv6_addr_type(addr);
602
603 if (addr_type == IPV6_ADDR_ANY ||
604 addr_type & IPV6_ADDR_MULTICAST ||
605 (!(idev->dev->flags & IFF_LOOPBACK) &&
606 addr_type & IPV6_ADDR_LOOPBACK))
607 return ERR_PTR(-EADDRNOTAVAIL);
608
609 rcu_read_lock_bh();
610 if (idev->dead) {
611 err = -ENODEV; /*XXX*/
612 goto out2;
613 }
614
615 if (idev->cnf.disable_ipv6) {
616 err = -EACCES;
617 goto out2;
618 }
619
620 spin_lock(&addrconf_hash_lock);
621
622 /* Ignore adding duplicate addresses on an interface */
623 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
624 ADBG(("ipv6_add_addr: already assigned\n"));
625 err = -EEXIST;
626 goto out;
627 }
628
629 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
630
631 if (ifa == NULL) {
632 ADBG(("ipv6_add_addr: malloc failed\n"));
633 err = -ENOBUFS;
634 goto out;
635 }
636
637 rt = addrconf_dst_alloc(idev, addr, false);
638 if (IS_ERR(rt)) {
639 err = PTR_ERR(rt);
640 goto out;
641 }
642
643 ifa->addr = *addr;
644
645 spin_lock_init(&ifa->lock);
646 spin_lock_init(&ifa->state_lock);
647 init_timer(&ifa->timer);
648 INIT_HLIST_NODE(&ifa->addr_lst);
649 ifa->timer.data = (unsigned long) ifa;
650 ifa->scope = scope;
651 ifa->prefix_len = pfxlen;
652 ifa->flags = flags | IFA_F_TENTATIVE;
653 ifa->cstamp = ifa->tstamp = jiffies;
654
655 ifa->rt = rt;
656
657 ifa->idev = idev;
658 in6_dev_hold(idev);
659 /* For caller */
660 in6_ifa_hold(ifa);
661
662 /* Add to big hash table */
663 hash = ipv6_addr_hash(addr);
664
665 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
666 spin_unlock(&addrconf_hash_lock);
667
668 write_lock(&idev->lock);
669 /* Add to inet6_dev unicast addr list. */
670 ipv6_link_dev_addr(idev, ifa);
671
672#ifdef CONFIG_IPV6_PRIVACY
673 if (ifa->flags&IFA_F_TEMPORARY) {
674 list_add(&ifa->tmp_list, &idev->tempaddr_list);
675 in6_ifa_hold(ifa);
676 }
677#endif
678
679 in6_ifa_hold(ifa);
680 write_unlock(&idev->lock);
681out2:
682 rcu_read_unlock_bh();
683
684 if (likely(err == 0))
685 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
686 else {
687 kfree(ifa);
688 ifa = ERR_PTR(err);
689 }
690
691 return ifa;
692out:
693 spin_unlock(&addrconf_hash_lock);
694 goto out2;
695}
696
697/* This function wants to get referenced ifp and releases it before return */
698
699static void ipv6_del_addr(struct inet6_ifaddr *ifp)
700{
701 struct inet6_ifaddr *ifa, *ifn;
702 struct inet6_dev *idev = ifp->idev;
703 int state;
704 int deleted = 0, onlink = 0;
705 unsigned long expires = jiffies;
706
707 spin_lock_bh(&ifp->state_lock);
708 state = ifp->state;
709 ifp->state = INET6_IFADDR_STATE_DEAD;
710 spin_unlock_bh(&ifp->state_lock);
711
712 if (state == INET6_IFADDR_STATE_DEAD)
713 goto out;
714
715 spin_lock_bh(&addrconf_hash_lock);
716 hlist_del_init_rcu(&ifp->addr_lst);
717 spin_unlock_bh(&addrconf_hash_lock);
718
719 write_lock_bh(&idev->lock);
720#ifdef CONFIG_IPV6_PRIVACY
721 if (ifp->flags&IFA_F_TEMPORARY) {
722 list_del(&ifp->tmp_list);
723 if (ifp->ifpub) {
724 in6_ifa_put(ifp->ifpub);
725 ifp->ifpub = NULL;
726 }
727 __in6_ifa_put(ifp);
728 }
729#endif
730
731 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
732 if (ifa == ifp) {
733 list_del_init(&ifp->if_list);
734 __in6_ifa_put(ifp);
735
736 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
737 break;
738 deleted = 1;
739 continue;
740 } else if (ifp->flags & IFA_F_PERMANENT) {
741 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
742 ifp->prefix_len)) {
743 if (ifa->flags & IFA_F_PERMANENT) {
744 onlink = 1;
745 if (deleted)
746 break;
747 } else {
748 unsigned long lifetime;
749
750 if (!onlink)
751 onlink = -1;
752
753 spin_lock(&ifa->lock);
754
755 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
756 /*
757 * Note: Because this address is
758 * not permanent, lifetime <
759 * LONG_MAX / HZ here.
760 */
761 if (time_before(expires,
762 ifa->tstamp + lifetime * HZ))
763 expires = ifa->tstamp + lifetime * HZ;
764 spin_unlock(&ifa->lock);
765 }
766 }
767 }
768 }
769 write_unlock_bh(&idev->lock);
770
771 addrconf_del_timer(ifp);
772
773 ipv6_ifa_notify(RTM_DELADDR, ifp);
774
775 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
776
777 /*
778 * Purge or update corresponding prefix
779 *
780 * 1) we don't purge prefix here if address was not permanent.
781 * prefix is managed by its own lifetime.
782 * 2) if there're no addresses, delete prefix.
783 * 3) if there're still other permanent address(es),
784 * corresponding prefix is still permanent.
785 * 4) otherwise, update prefix lifetime to the
786 * longest valid lifetime among the corresponding
787 * addresses on the device.
788 * Note: subsequent RA will update lifetime.
789 *
790 * --yoshfuji
791 */
792 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
793 struct in6_addr prefix;
794 struct rt6_info *rt;
795 struct net *net = dev_net(ifp->idev->dev);
796 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
797 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
798
799 if (rt && addrconf_is_prefix_route(rt)) {
800 if (onlink == 0) {
801 ip6_del_rt(rt);
802 rt = NULL;
803 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
804 rt6_set_expires(rt, expires);
805 }
806 }
807 dst_release(&rt->dst);
808 }
809
810 /* clean up prefsrc entries */
811 rt6_remove_prefsrc(ifp);
812out:
813 in6_ifa_put(ifp);
814}
815
816#ifdef CONFIG_IPV6_PRIVACY
817static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
818{
819 struct inet6_dev *idev = ifp->idev;
820 struct in6_addr addr, *tmpaddr;
821 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
822 unsigned long regen_advance;
823 int tmp_plen;
824 int ret = 0;
825 int max_addresses;
826 u32 addr_flags;
827 unsigned long now = jiffies;
828
829 write_lock(&idev->lock);
830 if (ift) {
831 spin_lock_bh(&ift->lock);
832 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
833 spin_unlock_bh(&ift->lock);
834 tmpaddr = &addr;
835 } else {
836 tmpaddr = NULL;
837 }
838retry:
839 in6_dev_hold(idev);
840 if (idev->cnf.use_tempaddr <= 0) {
841 write_unlock(&idev->lock);
842 pr_info("%s: use_tempaddr is disabled\n", __func__);
843 in6_dev_put(idev);
844 ret = -1;
845 goto out;
846 }
847 spin_lock_bh(&ifp->lock);
848 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
849 idev->cnf.use_tempaddr = -1; /*XXX*/
850 spin_unlock_bh(&ifp->lock);
851 write_unlock(&idev->lock);
852 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
853 __func__);
854 in6_dev_put(idev);
855 ret = -1;
856 goto out;
857 }
858 in6_ifa_hold(ifp);
859 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
860 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
861 spin_unlock_bh(&ifp->lock);
862 write_unlock(&idev->lock);
863 pr_warn("%s: regeneration of randomized interface id failed\n",
864 __func__);
865 in6_ifa_put(ifp);
866 in6_dev_put(idev);
867 ret = -1;
868 goto out;
869 }
870 memcpy(&addr.s6_addr[8], idev->rndid, 8);
871 age = (now - ifp->tstamp) / HZ;
872 tmp_valid_lft = min_t(__u32,
873 ifp->valid_lft,
874 idev->cnf.temp_valid_lft + age);
875 tmp_prefered_lft = min_t(__u32,
876 ifp->prefered_lft,
877 idev->cnf.temp_prefered_lft + age -
878 idev->cnf.max_desync_factor);
879 tmp_plen = ifp->prefix_len;
880 max_addresses = idev->cnf.max_addresses;
881 tmp_tstamp = ifp->tstamp;
882 spin_unlock_bh(&ifp->lock);
883
884 regen_advance = idev->cnf.regen_max_retry *
885 idev->cnf.dad_transmits *
886 idev->nd_parms->retrans_time / HZ;
887 write_unlock(&idev->lock);
888
889 /* A temporary address is created only if this calculated Preferred
890 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
891 * an implementation must not create a temporary address with a zero
892 * Preferred Lifetime.
893 */
894 if (tmp_prefered_lft <= regen_advance) {
895 in6_ifa_put(ifp);
896 in6_dev_put(idev);
897 ret = -1;
898 goto out;
899 }
900
901 addr_flags = IFA_F_TEMPORARY;
902 /* set in addrconf_prefix_rcv() */
903 if (ifp->flags & IFA_F_OPTIMISTIC)
904 addr_flags |= IFA_F_OPTIMISTIC;
905
906 ift = !max_addresses ||
907 ipv6_count_addresses(idev) < max_addresses ?
908 ipv6_add_addr(idev, &addr, tmp_plen,
909 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
910 addr_flags) : NULL;
911 if (!ift || IS_ERR(ift)) {
912 in6_ifa_put(ifp);
913 in6_dev_put(idev);
914 pr_info("%s: retry temporary address regeneration\n", __func__);
915 tmpaddr = &addr;
916 write_lock(&idev->lock);
917 goto retry;
918 }
919
920 spin_lock_bh(&ift->lock);
921 ift->ifpub = ifp;
922 ift->valid_lft = tmp_valid_lft;
923 ift->prefered_lft = tmp_prefered_lft;
924 ift->cstamp = now;
925 ift->tstamp = tmp_tstamp;
926 spin_unlock_bh(&ift->lock);
927
928 addrconf_dad_start(ift);
929 in6_ifa_put(ift);
930 in6_dev_put(idev);
931out:
932 return ret;
933}
934#endif
935
936/*
937 * Choose an appropriate source address (RFC3484)
938 */
939enum {
940 IPV6_SADDR_RULE_INIT = 0,
941 IPV6_SADDR_RULE_LOCAL,
942 IPV6_SADDR_RULE_SCOPE,
943 IPV6_SADDR_RULE_PREFERRED,
944#ifdef CONFIG_IPV6_MIP6
945 IPV6_SADDR_RULE_HOA,
946#endif
947 IPV6_SADDR_RULE_OIF,
948 IPV6_SADDR_RULE_LABEL,
949#ifdef CONFIG_IPV6_PRIVACY
950 IPV6_SADDR_RULE_PRIVACY,
951#endif
952 IPV6_SADDR_RULE_ORCHID,
953 IPV6_SADDR_RULE_PREFIX,
954 IPV6_SADDR_RULE_MAX
955};
956
957struct ipv6_saddr_score {
958 int rule;
959 int addr_type;
960 struct inet6_ifaddr *ifa;
961 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
962 int scopedist;
963 int matchlen;
964};
965
966struct ipv6_saddr_dst {
967 const struct in6_addr *addr;
968 int ifindex;
969 int scope;
970 int label;
971 unsigned int prefs;
972};
973
974static inline int ipv6_saddr_preferred(int type)
975{
976 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
977 return 1;
978 return 0;
979}
980
981static int ipv6_get_saddr_eval(struct net *net,
982 struct ipv6_saddr_score *score,
983 struct ipv6_saddr_dst *dst,
984 int i)
985{
986 int ret;
987
988 if (i <= score->rule) {
989 switch (i) {
990 case IPV6_SADDR_RULE_SCOPE:
991 ret = score->scopedist;
992 break;
993 case IPV6_SADDR_RULE_PREFIX:
994 ret = score->matchlen;
995 break;
996 default:
997 ret = !!test_bit(i, score->scorebits);
998 }
999 goto out;
1000 }
1001
1002 switch (i) {
1003 case IPV6_SADDR_RULE_INIT:
1004 /* Rule 0: remember if hiscore is not ready yet */
1005 ret = !!score->ifa;
1006 break;
1007 case IPV6_SADDR_RULE_LOCAL:
1008 /* Rule 1: Prefer same address */
1009 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1010 break;
1011 case IPV6_SADDR_RULE_SCOPE:
1012 /* Rule 2: Prefer appropriate scope
1013 *
1014 * ret
1015 * ^
1016 * -1 | d 15
1017 * ---+--+-+---> scope
1018 * |
1019 * | d is scope of the destination.
1020 * B-d | \
1021 * | \ <- smaller scope is better if
1022 * B-15 | \ if scope is enough for destinaion.
1023 * | ret = B - scope (-1 <= scope >= d <= 15).
1024 * d-C-1 | /
1025 * |/ <- greater is better
1026 * -C / if scope is not enough for destination.
1027 * /| ret = scope - C (-1 <= d < scope <= 15).
1028 *
1029 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1030 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1031 * Assume B = 0 and we get C > 29.
1032 */
1033 ret = __ipv6_addr_src_scope(score->addr_type);
1034 if (ret >= dst->scope)
1035 ret = -ret;
1036 else
1037 ret -= 128; /* 30 is enough */
1038 score->scopedist = ret;
1039 break;
1040 case IPV6_SADDR_RULE_PREFERRED:
1041 /* Rule 3: Avoid deprecated and optimistic addresses */
1042 ret = ipv6_saddr_preferred(score->addr_type) ||
1043 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1044 break;
1045#ifdef CONFIG_IPV6_MIP6
1046 case IPV6_SADDR_RULE_HOA:
1047 {
1048 /* Rule 4: Prefer home address */
1049 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1050 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1051 break;
1052 }
1053#endif
1054 case IPV6_SADDR_RULE_OIF:
1055 /* Rule 5: Prefer outgoing interface */
1056 ret = (!dst->ifindex ||
1057 dst->ifindex == score->ifa->idev->dev->ifindex);
1058 break;
1059 case IPV6_SADDR_RULE_LABEL:
1060 /* Rule 6: Prefer matching label */
1061 ret = ipv6_addr_label(net,
1062 &score->ifa->addr, score->addr_type,
1063 score->ifa->idev->dev->ifindex) == dst->label;
1064 break;
1065#ifdef CONFIG_IPV6_PRIVACY
1066 case IPV6_SADDR_RULE_PRIVACY:
1067 {
1068 /* Rule 7: Prefer public address
1069 * Note: prefer temporary address if use_tempaddr >= 2
1070 */
1071 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1072 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1073 score->ifa->idev->cnf.use_tempaddr >= 2;
1074 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1075 break;
1076 }
1077#endif
1078 case IPV6_SADDR_RULE_ORCHID:
1079 /* Rule 8-: Prefer ORCHID vs ORCHID or
1080 * non-ORCHID vs non-ORCHID
1081 */
1082 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1083 ipv6_addr_orchid(dst->addr));
1084 break;
1085 case IPV6_SADDR_RULE_PREFIX:
1086 /* Rule 8: Use longest matching prefix */
1087 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1088 dst->addr);
1089 break;
1090 default:
1091 ret = 0;
1092 }
1093
1094 if (ret)
1095 __set_bit(i, score->scorebits);
1096 score->rule = i;
1097out:
1098 return ret;
1099}
1100
1101int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1102 const struct in6_addr *daddr, unsigned int prefs,
1103 struct in6_addr *saddr)
1104{
1105 struct ipv6_saddr_score scores[2],
1106 *score = &scores[0], *hiscore = &scores[1];
1107 struct ipv6_saddr_dst dst;
1108 struct net_device *dev;
1109 int dst_type;
1110
1111 dst_type = __ipv6_addr_type(daddr);
1112 dst.addr = daddr;
1113 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1114 dst.scope = __ipv6_addr_src_scope(dst_type);
1115 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1116 dst.prefs = prefs;
1117
1118 hiscore->rule = -1;
1119 hiscore->ifa = NULL;
1120
1121 rcu_read_lock();
1122
1123 for_each_netdev_rcu(net, dev) {
1124 struct inet6_dev *idev;
1125
1126 /* Candidate Source Address (section 4)
1127 * - multicast and link-local destination address,
1128 * the set of candidate source address MUST only
1129 * include addresses assigned to interfaces
1130 * belonging to the same link as the outgoing
1131 * interface.
1132 * (- For site-local destination addresses, the
1133 * set of candidate source addresses MUST only
1134 * include addresses assigned to interfaces
1135 * belonging to the same site as the outgoing
1136 * interface.)
1137 */
1138 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1139 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1140 dst.ifindex && dev->ifindex != dst.ifindex)
1141 continue;
1142
1143 idev = __in6_dev_get(dev);
1144 if (!idev)
1145 continue;
1146
1147 read_lock_bh(&idev->lock);
1148 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1149 int i;
1150
1151 /*
1152 * - Tentative Address (RFC2462 section 5.4)
1153 * - A tentative address is not considered
1154 * "assigned to an interface" in the traditional
1155 * sense, unless it is also flagged as optimistic.
1156 * - Candidate Source Address (section 4)
1157 * - In any case, anycast addresses, multicast
1158 * addresses, and the unspecified address MUST
1159 * NOT be included in a candidate set.
1160 */
1161 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1162 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1163 continue;
1164
1165 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1166
1167 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1168 score->addr_type & IPV6_ADDR_MULTICAST)) {
1169 LIMIT_NETDEBUG(KERN_DEBUG
1170 "ADDRCONF: unspecified / multicast address "
1171 "assigned as unicast address on %s",
1172 dev->name);
1173 continue;
1174 }
1175
1176 score->rule = -1;
1177 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1178
1179 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1180 int minihiscore, miniscore;
1181
1182 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1183 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1184
1185 if (minihiscore > miniscore) {
1186 if (i == IPV6_SADDR_RULE_SCOPE &&
1187 score->scopedist > 0) {
1188 /*
1189 * special case:
1190 * each remaining entry
1191 * has too small (not enough)
1192 * scope, because ifa entries
1193 * are sorted by their scope
1194 * values.
1195 */
1196 goto try_nextdev;
1197 }
1198 break;
1199 } else if (minihiscore < miniscore) {
1200 if (hiscore->ifa)
1201 in6_ifa_put(hiscore->ifa);
1202
1203 in6_ifa_hold(score->ifa);
1204
1205 swap(hiscore, score);
1206
1207 /* restore our iterator */
1208 score->ifa = hiscore->ifa;
1209
1210 break;
1211 }
1212 }
1213 }
1214try_nextdev:
1215 read_unlock_bh(&idev->lock);
1216 }
1217 rcu_read_unlock();
1218
1219 if (!hiscore->ifa)
1220 return -EADDRNOTAVAIL;
1221
1222 *saddr = hiscore->ifa->addr;
1223 in6_ifa_put(hiscore->ifa);
1224 return 0;
1225}
1226EXPORT_SYMBOL(ipv6_dev_get_saddr);
1227
1228int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1229 unsigned char banned_flags)
1230{
1231 struct inet6_dev *idev;
1232 int err = -EADDRNOTAVAIL;
1233
1234 rcu_read_lock();
1235 idev = __in6_dev_get(dev);
1236 if (idev) {
1237 struct inet6_ifaddr *ifp;
1238
1239 read_lock_bh(&idev->lock);
1240 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1241 if (ifp->scope == IFA_LINK &&
1242 !(ifp->flags & banned_flags)) {
1243 *addr = ifp->addr;
1244 err = 0;
1245 break;
1246 }
1247 }
1248 read_unlock_bh(&idev->lock);
1249 }
1250 rcu_read_unlock();
1251 return err;
1252}
1253
1254static int ipv6_count_addresses(struct inet6_dev *idev)
1255{
1256 int cnt = 0;
1257 struct inet6_ifaddr *ifp;
1258
1259 read_lock_bh(&idev->lock);
1260 list_for_each_entry(ifp, &idev->addr_list, if_list)
1261 cnt++;
1262 read_unlock_bh(&idev->lock);
1263 return cnt;
1264}
1265
1266int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1267 struct net_device *dev, int strict)
1268{
1269 struct inet6_ifaddr *ifp;
1270 struct hlist_node *node;
1271 unsigned int hash = ipv6_addr_hash(addr);
1272
1273 rcu_read_lock_bh();
1274 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1275 if (!net_eq(dev_net(ifp->idev->dev), net))
1276 continue;
1277 if (ipv6_addr_equal(&ifp->addr, addr) &&
1278 !(ifp->flags&IFA_F_TENTATIVE) &&
1279 (dev == NULL || ifp->idev->dev == dev ||
1280 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1281 rcu_read_unlock_bh();
1282 return 1;
1283 }
1284 }
1285
1286 rcu_read_unlock_bh();
1287 return 0;
1288}
1289EXPORT_SYMBOL(ipv6_chk_addr);
1290
1291static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1292 struct net_device *dev)
1293{
1294 unsigned int hash = ipv6_addr_hash(addr);
1295 struct inet6_ifaddr *ifp;
1296 struct hlist_node *node;
1297
1298 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1299 if (!net_eq(dev_net(ifp->idev->dev), net))
1300 continue;
1301 if (ipv6_addr_equal(&ifp->addr, addr)) {
1302 if (dev == NULL || ifp->idev->dev == dev)
1303 return true;
1304 }
1305 }
1306 return false;
1307}
1308
1309int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1310{
1311 struct inet6_dev *idev;
1312 struct inet6_ifaddr *ifa;
1313 int onlink;
1314
1315 onlink = 0;
1316 rcu_read_lock();
1317 idev = __in6_dev_get(dev);
1318 if (idev) {
1319 read_lock_bh(&idev->lock);
1320 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1321 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1322 ifa->prefix_len);
1323 if (onlink)
1324 break;
1325 }
1326 read_unlock_bh(&idev->lock);
1327 }
1328 rcu_read_unlock();
1329 return onlink;
1330}
1331EXPORT_SYMBOL(ipv6_chk_prefix);
1332
1333struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1334 struct net_device *dev, int strict)
1335{
1336 struct inet6_ifaddr *ifp, *result = NULL;
1337 unsigned int hash = ipv6_addr_hash(addr);
1338 struct hlist_node *node;
1339
1340 rcu_read_lock_bh();
1341 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1342 if (!net_eq(dev_net(ifp->idev->dev), net))
1343 continue;
1344 if (ipv6_addr_equal(&ifp->addr, addr)) {
1345 if (dev == NULL || ifp->idev->dev == dev ||
1346 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1347 result = ifp;
1348 in6_ifa_hold(ifp);
1349 break;
1350 }
1351 }
1352 }
1353 rcu_read_unlock_bh();
1354
1355 return result;
1356}
1357
1358/* Gets referenced address, destroys ifaddr */
1359
1360static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1361{
1362 if (ifp->flags&IFA_F_PERMANENT) {
1363 spin_lock_bh(&ifp->lock);
1364 addrconf_del_timer(ifp);
1365 ifp->flags |= IFA_F_TENTATIVE;
1366 if (dad_failed)
1367 ifp->flags |= IFA_F_DADFAILED;
1368 spin_unlock_bh(&ifp->lock);
1369 if (dad_failed)
1370 ipv6_ifa_notify(0, ifp);
1371 in6_ifa_put(ifp);
1372#ifdef CONFIG_IPV6_PRIVACY
1373 } else if (ifp->flags&IFA_F_TEMPORARY) {
1374 struct inet6_ifaddr *ifpub;
1375 spin_lock_bh(&ifp->lock);
1376 ifpub = ifp->ifpub;
1377 if (ifpub) {
1378 in6_ifa_hold(ifpub);
1379 spin_unlock_bh(&ifp->lock);
1380 ipv6_create_tempaddr(ifpub, ifp);
1381 in6_ifa_put(ifpub);
1382 } else {
1383 spin_unlock_bh(&ifp->lock);
1384 }
1385 ipv6_del_addr(ifp);
1386#endif
1387 } else
1388 ipv6_del_addr(ifp);
1389}
1390
1391static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1392{
1393 int err = -ENOENT;
1394
1395 spin_lock(&ifp->state_lock);
1396 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1397 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1398 err = 0;
1399 }
1400 spin_unlock(&ifp->state_lock);
1401
1402 return err;
1403}
1404
1405void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1406{
1407 struct inet6_dev *idev = ifp->idev;
1408
1409 if (addrconf_dad_end(ifp)) {
1410 in6_ifa_put(ifp);
1411 return;
1412 }
1413
1414 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1415 ifp->idev->dev->name, &ifp->addr);
1416
1417 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1418 struct in6_addr addr;
1419
1420 addr.s6_addr32[0] = htonl(0xfe800000);
1421 addr.s6_addr32[1] = 0;
1422
1423 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1424 ipv6_addr_equal(&ifp->addr, &addr)) {
1425 /* DAD failed for link-local based on MAC address */
1426 idev->cnf.disable_ipv6 = 1;
1427
1428 pr_info("%s: IPv6 being disabled!\n",
1429 ifp->idev->dev->name);
1430 }
1431 }
1432
1433 addrconf_dad_stop(ifp, 1);
1434}
1435
1436/* Join to solicited addr multicast group. */
1437
1438void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1439{
1440 struct in6_addr maddr;
1441
1442 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1443 return;
1444
1445 addrconf_addr_solict_mult(addr, &maddr);
1446 ipv6_dev_mc_inc(dev, &maddr);
1447}
1448
1449void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1450{
1451 struct in6_addr maddr;
1452
1453 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1454 return;
1455
1456 addrconf_addr_solict_mult(addr, &maddr);
1457 __ipv6_dev_mc_dec(idev, &maddr);
1458}
1459
1460static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1461{
1462 struct in6_addr addr;
1463 if (ifp->prefix_len == 127) /* RFC 6164 */
1464 return;
1465 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1466 if (ipv6_addr_any(&addr))
1467 return;
1468 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1469}
1470
1471static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1472{
1473 struct in6_addr addr;
1474 if (ifp->prefix_len == 127) /* RFC 6164 */
1475 return;
1476 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1477 if (ipv6_addr_any(&addr))
1478 return;
1479 __ipv6_dev_ac_dec(ifp->idev, &addr);
1480}
1481
1482static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1483{
1484 if (dev->addr_len != ETH_ALEN)
1485 return -1;
1486 memcpy(eui, dev->dev_addr, 3);
1487 memcpy(eui + 5, dev->dev_addr + 3, 3);
1488
1489 /*
1490 * The zSeries OSA network cards can be shared among various
1491 * OS instances, but the OSA cards have only one MAC address.
1492 * This leads to duplicate address conflicts in conjunction
1493 * with IPv6 if more than one instance uses the same card.
1494 *
1495 * The driver for these cards can deliver a unique 16-bit
1496 * identifier for each instance sharing the same card. It is
1497 * placed instead of 0xFFFE in the interface identifier. The
1498 * "u" bit of the interface identifier is not inverted in this
1499 * case. Hence the resulting interface identifier has local
1500 * scope according to RFC2373.
1501 */
1502 if (dev->dev_id) {
1503 eui[3] = (dev->dev_id >> 8) & 0xFF;
1504 eui[4] = dev->dev_id & 0xFF;
1505 } else {
1506 eui[3] = 0xFF;
1507 eui[4] = 0xFE;
1508 eui[0] ^= 2;
1509 }
1510 return 0;
1511}
1512
1513static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1514{
1515 if (dev->addr_len != IEEE802154_ADDR_LEN)
1516 return -1;
1517 memcpy(eui, dev->dev_addr, 8);
1518 return 0;
1519}
1520
1521static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1522{
1523 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1524 if (dev->addr_len != ARCNET_ALEN)
1525 return -1;
1526 memset(eui, 0, 7);
1527 eui[7] = *(u8 *)dev->dev_addr;
1528 return 0;
1529}
1530
1531static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1532{
1533 if (dev->addr_len != INFINIBAND_ALEN)
1534 return -1;
1535 memcpy(eui, dev->dev_addr + 12, 8);
1536 eui[0] |= 2;
1537 return 0;
1538}
1539
1540static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1541{
1542 if (addr == 0)
1543 return -1;
1544 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1545 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1546 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1547 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1548 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1549 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1550 eui[1] = 0;
1551 eui[2] = 0x5E;
1552 eui[3] = 0xFE;
1553 memcpy(eui + 4, &addr, 4);
1554 return 0;
1555}
1556
1557static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1558{
1559 if (dev->priv_flags & IFF_ISATAP)
1560 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1561 return -1;
1562}
1563
1564static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1565{
1566 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1567}
1568
1569static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1570{
1571 switch (dev->type) {
1572 case ARPHRD_ETHER:
1573 case ARPHRD_FDDI:
1574 return addrconf_ifid_eui48(eui, dev);
1575 case ARPHRD_ARCNET:
1576 return addrconf_ifid_arcnet(eui, dev);
1577 case ARPHRD_INFINIBAND:
1578 return addrconf_ifid_infiniband(eui, dev);
1579 case ARPHRD_SIT:
1580 return addrconf_ifid_sit(eui, dev);
1581 case ARPHRD_IPGRE:
1582 return addrconf_ifid_gre(eui, dev);
1583 case ARPHRD_IEEE802154:
1584 return addrconf_ifid_eui64(eui, dev);
1585 }
1586 return -1;
1587}
1588
1589static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1590{
1591 int err = -1;
1592 struct inet6_ifaddr *ifp;
1593
1594 read_lock_bh(&idev->lock);
1595 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1596 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1597 memcpy(eui, ifp->addr.s6_addr+8, 8);
1598 err = 0;
1599 break;
1600 }
1601 }
1602 read_unlock_bh(&idev->lock);
1603 return err;
1604}
1605
1606#ifdef CONFIG_IPV6_PRIVACY
1607/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1608static int __ipv6_regen_rndid(struct inet6_dev *idev)
1609{
1610regen:
1611 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1612 idev->rndid[0] &= ~0x02;
1613
1614 /*
1615 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1616 * check if generated address is not inappropriate
1617 *
1618 * - Reserved subnet anycast (RFC 2526)
1619 * 11111101 11....11 1xxxxxxx
1620 * - ISATAP (RFC4214) 6.1
1621 * 00-00-5E-FE-xx-xx-xx-xx
1622 * - value 0
1623 * - XXX: already assigned to an address on the device
1624 */
1625 if (idev->rndid[0] == 0xfd &&
1626 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1627 (idev->rndid[7]&0x80))
1628 goto regen;
1629 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1630 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1631 goto regen;
1632 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1633 goto regen;
1634 }
1635
1636 return 0;
1637}
1638
1639static void ipv6_regen_rndid(unsigned long data)
1640{
1641 struct inet6_dev *idev = (struct inet6_dev *) data;
1642 unsigned long expires;
1643
1644 rcu_read_lock_bh();
1645 write_lock_bh(&idev->lock);
1646
1647 if (idev->dead)
1648 goto out;
1649
1650 if (__ipv6_regen_rndid(idev) < 0)
1651 goto out;
1652
1653 expires = jiffies +
1654 idev->cnf.temp_prefered_lft * HZ -
1655 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1656 idev->cnf.max_desync_factor * HZ;
1657 if (time_before(expires, jiffies)) {
1658 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1659 __func__, idev->dev->name);
1660 goto out;
1661 }
1662
1663 if (!mod_timer(&idev->regen_timer, expires))
1664 in6_dev_hold(idev);
1665
1666out:
1667 write_unlock_bh(&idev->lock);
1668 rcu_read_unlock_bh();
1669 in6_dev_put(idev);
1670}
1671
1672static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1673{
1674 int ret = 0;
1675
1676 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1677 ret = __ipv6_regen_rndid(idev);
1678 return ret;
1679}
1680#endif
1681
1682/*
1683 * Add prefix route.
1684 */
1685
1686static void
1687addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1688 unsigned long expires, u32 flags)
1689{
1690 struct fib6_config cfg = {
1691 .fc_table = RT6_TABLE_PREFIX,
1692 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1693 .fc_ifindex = dev->ifindex,
1694 .fc_expires = expires,
1695 .fc_dst_len = plen,
1696 .fc_flags = RTF_UP | flags,
1697 .fc_nlinfo.nl_net = dev_net(dev),
1698 .fc_protocol = RTPROT_KERNEL,
1699 };
1700
1701 cfg.fc_dst = *pfx;
1702
1703 /* Prevent useless cloning on PtP SIT.
1704 This thing is done here expecting that the whole
1705 class of non-broadcast devices need not cloning.
1706 */
1707#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1708 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1709 cfg.fc_flags |= RTF_NONEXTHOP;
1710#endif
1711
1712 ip6_route_add(&cfg);
1713}
1714
1715
1716static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1717 int plen,
1718 const struct net_device *dev,
1719 u32 flags, u32 noflags)
1720{
1721 struct fib6_node *fn;
1722 struct rt6_info *rt = NULL;
1723 struct fib6_table *table;
1724
1725 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1726 if (table == NULL)
1727 return NULL;
1728
1729 write_lock_bh(&table->tb6_lock);
1730 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1731 if (!fn)
1732 goto out;
1733 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1734 if (rt->dst.dev->ifindex != dev->ifindex)
1735 continue;
1736 if ((rt->rt6i_flags & flags) != flags)
1737 continue;
1738 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1739 continue;
1740 dst_hold(&rt->dst);
1741 break;
1742 }
1743out:
1744 write_unlock_bh(&table->tb6_lock);
1745 return rt;
1746}
1747
1748
1749/* Create "default" multicast route to the interface */
1750
1751static void addrconf_add_mroute(struct net_device *dev)
1752{
1753 struct fib6_config cfg = {
1754 .fc_table = RT6_TABLE_LOCAL,
1755 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1756 .fc_ifindex = dev->ifindex,
1757 .fc_dst_len = 8,
1758 .fc_flags = RTF_UP,
1759 .fc_nlinfo.nl_net = dev_net(dev),
1760 };
1761
1762 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1763
1764 ip6_route_add(&cfg);
1765}
1766
1767#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1768static void sit_route_add(struct net_device *dev)
1769{
1770 struct fib6_config cfg = {
1771 .fc_table = RT6_TABLE_MAIN,
1772 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1773 .fc_ifindex = dev->ifindex,
1774 .fc_dst_len = 96,
1775 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1776 .fc_nlinfo.nl_net = dev_net(dev),
1777 };
1778
1779 /* prefix length - 96 bits "::d.d.d.d" */
1780 ip6_route_add(&cfg);
1781}
1782#endif
1783
1784static void addrconf_add_lroute(struct net_device *dev)
1785{
1786 struct in6_addr addr;
1787
1788 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1789 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1790}
1791
1792static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1793{
1794 struct inet6_dev *idev;
1795
1796 ASSERT_RTNL();
1797
1798 idev = ipv6_find_idev(dev);
1799 if (!idev)
1800 return ERR_PTR(-ENOBUFS);
1801
1802 if (idev->cnf.disable_ipv6)
1803 return ERR_PTR(-EACCES);
1804
1805 /* Add default multicast route */
1806 if (!(dev->flags & IFF_LOOPBACK))
1807 addrconf_add_mroute(dev);
1808
1809 /* Add link local route */
1810 addrconf_add_lroute(dev);
1811 return idev;
1812}
1813
1814void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1815{
1816 struct prefix_info *pinfo;
1817 __u32 valid_lft;
1818 __u32 prefered_lft;
1819 int addr_type;
1820 struct inet6_dev *in6_dev;
1821 struct net *net = dev_net(dev);
1822
1823 pinfo = (struct prefix_info *) opt;
1824
1825 if (len < sizeof(struct prefix_info)) {
1826 ADBG(("addrconf: prefix option too short\n"));
1827 return;
1828 }
1829
1830 /*
1831 * Validation checks ([ADDRCONF], page 19)
1832 */
1833
1834 addr_type = ipv6_addr_type(&pinfo->prefix);
1835
1836 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1837 return;
1838
1839 valid_lft = ntohl(pinfo->valid);
1840 prefered_lft = ntohl(pinfo->prefered);
1841
1842 if (prefered_lft > valid_lft) {
1843 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1844 return;
1845 }
1846
1847 in6_dev = in6_dev_get(dev);
1848
1849 if (in6_dev == NULL) {
1850 net_dbg_ratelimited("addrconf: device %s not configured\n",
1851 dev->name);
1852 return;
1853 }
1854
1855 /*
1856 * Two things going on here:
1857 * 1) Add routes for on-link prefixes
1858 * 2) Configure prefixes with the auto flag set
1859 */
1860
1861 if (pinfo->onlink) {
1862 struct rt6_info *rt;
1863 unsigned long rt_expires;
1864
1865 /* Avoid arithmetic overflow. Really, we could
1866 * save rt_expires in seconds, likely valid_lft,
1867 * but it would require division in fib gc, that it
1868 * not good.
1869 */
1870 if (HZ > USER_HZ)
1871 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1872 else
1873 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1874
1875 if (addrconf_finite_timeout(rt_expires))
1876 rt_expires *= HZ;
1877
1878 rt = addrconf_get_prefix_route(&pinfo->prefix,
1879 pinfo->prefix_len,
1880 dev,
1881 RTF_ADDRCONF | RTF_PREFIX_RT,
1882 RTF_GATEWAY | RTF_DEFAULT);
1883
1884 if (rt) {
1885 /* Autoconf prefix route */
1886 if (valid_lft == 0) {
1887 ip6_del_rt(rt);
1888 rt = NULL;
1889 } else if (addrconf_finite_timeout(rt_expires)) {
1890 /* not infinity */
1891 rt6_set_expires(rt, jiffies + rt_expires);
1892 } else {
1893 rt6_clean_expires(rt);
1894 }
1895 } else if (valid_lft) {
1896 clock_t expires = 0;
1897 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1898 if (addrconf_finite_timeout(rt_expires)) {
1899 /* not infinity */
1900 flags |= RTF_EXPIRES;
1901 expires = jiffies_to_clock_t(rt_expires);
1902 }
1903 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1904 dev, expires, flags);
1905 }
1906 if (rt)
1907 dst_release(&rt->dst);
1908 }
1909
1910 /* Try to figure out our local address for this prefix */
1911
1912 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1913 struct inet6_ifaddr *ifp;
1914 struct in6_addr addr;
1915 int create = 0, update_lft = 0;
1916
1917 if (pinfo->prefix_len == 64) {
1918 memcpy(&addr, &pinfo->prefix, 8);
1919 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1920 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1921 in6_dev_put(in6_dev);
1922 return;
1923 }
1924 goto ok;
1925 }
1926 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
1927 pinfo->prefix_len);
1928 in6_dev_put(in6_dev);
1929 return;
1930
1931ok:
1932
1933 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1934
1935 if (ifp == NULL && valid_lft) {
1936 int max_addresses = in6_dev->cnf.max_addresses;
1937 u32 addr_flags = 0;
1938
1939#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1940 if (in6_dev->cnf.optimistic_dad &&
1941 !net->ipv6.devconf_all->forwarding && sllao)
1942 addr_flags = IFA_F_OPTIMISTIC;
1943#endif
1944
1945 /* Do not allow to create too much of autoconfigured
1946 * addresses; this would be too easy way to crash kernel.
1947 */
1948 if (!max_addresses ||
1949 ipv6_count_addresses(in6_dev) < max_addresses)
1950 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1951 addr_type&IPV6_ADDR_SCOPE_MASK,
1952 addr_flags);
1953
1954 if (!ifp || IS_ERR(ifp)) {
1955 in6_dev_put(in6_dev);
1956 return;
1957 }
1958
1959 update_lft = create = 1;
1960 ifp->cstamp = jiffies;
1961 addrconf_dad_start(ifp);
1962 }
1963
1964 if (ifp) {
1965 int flags;
1966 unsigned long now;
1967#ifdef CONFIG_IPV6_PRIVACY
1968 struct inet6_ifaddr *ift;
1969#endif
1970 u32 stored_lft;
1971
1972 /* update lifetime (RFC2462 5.5.3 e) */
1973 spin_lock(&ifp->lock);
1974 now = jiffies;
1975 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1976 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1977 else
1978 stored_lft = 0;
1979 if (!update_lft && stored_lft) {
1980 if (valid_lft > MIN_VALID_LIFETIME ||
1981 valid_lft > stored_lft)
1982 update_lft = 1;
1983 else if (stored_lft <= MIN_VALID_LIFETIME) {
1984 /* valid_lft <= stored_lft is always true */
1985 /*
1986 * RFC 4862 Section 5.5.3e:
1987 * "Note that the preferred lifetime of
1988 * the corresponding address is always
1989 * reset to the Preferred Lifetime in
1990 * the received Prefix Information
1991 * option, regardless of whether the
1992 * valid lifetime is also reset or
1993 * ignored."
1994 *
1995 * So if the preferred lifetime in
1996 * this advertisement is different
1997 * than what we have stored, but the
1998 * valid lifetime is invalid, just
1999 * reset prefered_lft.
2000 *
2001 * We must set the valid lifetime
2002 * to the stored lifetime since we'll
2003 * be updating the timestamp below,
2004 * else we'll set it back to the
2005 * minimum.
2006 */
2007 if (prefered_lft != ifp->prefered_lft) {
2008 valid_lft = stored_lft;
2009 update_lft = 1;
2010 }
2011 } else {
2012 valid_lft = MIN_VALID_LIFETIME;
2013 if (valid_lft < prefered_lft)
2014 prefered_lft = valid_lft;
2015 update_lft = 1;
2016 }
2017 }
2018
2019 if (update_lft) {
2020 ifp->valid_lft = valid_lft;
2021 ifp->prefered_lft = prefered_lft;
2022 ifp->tstamp = now;
2023 flags = ifp->flags;
2024 ifp->flags &= ~IFA_F_DEPRECATED;
2025 spin_unlock(&ifp->lock);
2026
2027 if (!(flags&IFA_F_TENTATIVE))
2028 ipv6_ifa_notify(0, ifp);
2029 } else
2030 spin_unlock(&ifp->lock);
2031
2032#ifdef CONFIG_IPV6_PRIVACY
2033 read_lock_bh(&in6_dev->lock);
2034 /* update all temporary addresses in the list */
2035 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2036 tmp_list) {
2037 int age, max_valid, max_prefered;
2038
2039 if (ifp != ift->ifpub)
2040 continue;
2041
2042 /*
2043 * RFC 4941 section 3.3:
2044 * If a received option will extend the lifetime
2045 * of a public address, the lifetimes of
2046 * temporary addresses should be extended,
2047 * subject to the overall constraint that no
2048 * temporary addresses should ever remain
2049 * "valid" or "preferred" for a time longer than
2050 * (TEMP_VALID_LIFETIME) or
2051 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2052 * respectively.
2053 */
2054 age = (now - ift->cstamp) / HZ;
2055 max_valid = in6_dev->cnf.temp_valid_lft - age;
2056 if (max_valid < 0)
2057 max_valid = 0;
2058
2059 max_prefered = in6_dev->cnf.temp_prefered_lft -
2060 in6_dev->cnf.max_desync_factor -
2061 age;
2062 if (max_prefered < 0)
2063 max_prefered = 0;
2064
2065 if (valid_lft > max_valid)
2066 valid_lft = max_valid;
2067
2068 if (prefered_lft > max_prefered)
2069 prefered_lft = max_prefered;
2070
2071 spin_lock(&ift->lock);
2072 flags = ift->flags;
2073 ift->valid_lft = valid_lft;
2074 ift->prefered_lft = prefered_lft;
2075 ift->tstamp = now;
2076 if (prefered_lft > 0)
2077 ift->flags &= ~IFA_F_DEPRECATED;
2078
2079 spin_unlock(&ift->lock);
2080 if (!(flags&IFA_F_TENTATIVE))
2081 ipv6_ifa_notify(0, ift);
2082 }
2083
2084 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2085 /*
2086 * When a new public address is created as
2087 * described in [ADDRCONF], also create a new
2088 * temporary address. Also create a temporary
2089 * address if it's enabled but no temporary
2090 * address currently exists.
2091 */
2092 read_unlock_bh(&in6_dev->lock);
2093 ipv6_create_tempaddr(ifp, NULL);
2094 } else {
2095 read_unlock_bh(&in6_dev->lock);
2096 }
2097#endif
2098 in6_ifa_put(ifp);
2099 addrconf_verify(0);
2100 }
2101 }
2102 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2103 in6_dev_put(in6_dev);
2104}
2105
2106/*
2107 * Set destination address.
2108 * Special case for SIT interfaces where we create a new "virtual"
2109 * device.
2110 */
2111int addrconf_set_dstaddr(struct net *net, void __user *arg)
2112{
2113 struct in6_ifreq ireq;
2114 struct net_device *dev;
2115 int err = -EINVAL;
2116
2117 rtnl_lock();
2118
2119 err = -EFAULT;
2120 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2121 goto err_exit;
2122
2123 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2124
2125 err = -ENODEV;
2126 if (dev == NULL)
2127 goto err_exit;
2128
2129#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2130 if (dev->type == ARPHRD_SIT) {
2131 const struct net_device_ops *ops = dev->netdev_ops;
2132 struct ifreq ifr;
2133 struct ip_tunnel_parm p;
2134
2135 err = -EADDRNOTAVAIL;
2136 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2137 goto err_exit;
2138
2139 memset(&p, 0, sizeof(p));
2140 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2141 p.iph.saddr = 0;
2142 p.iph.version = 4;
2143 p.iph.ihl = 5;
2144 p.iph.protocol = IPPROTO_IPV6;
2145 p.iph.ttl = 64;
2146 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2147
2148 if (ops->ndo_do_ioctl) {
2149 mm_segment_t oldfs = get_fs();
2150
2151 set_fs(KERNEL_DS);
2152 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2153 set_fs(oldfs);
2154 } else
2155 err = -EOPNOTSUPP;
2156
2157 if (err == 0) {
2158 err = -ENOBUFS;
2159 dev = __dev_get_by_name(net, p.name);
2160 if (!dev)
2161 goto err_exit;
2162 err = dev_open(dev);
2163 }
2164 }
2165#endif
2166
2167err_exit:
2168 rtnl_unlock();
2169 return err;
2170}
2171
2172/*
2173 * Manual configuration of address on an interface
2174 */
2175static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2176 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2177 __u32 valid_lft)
2178{
2179 struct inet6_ifaddr *ifp;
2180 struct inet6_dev *idev;
2181 struct net_device *dev;
2182 int scope;
2183 u32 flags;
2184 clock_t expires;
2185 unsigned long timeout;
2186
2187 ASSERT_RTNL();
2188
2189 if (plen > 128)
2190 return -EINVAL;
2191
2192 /* check the lifetime */
2193 if (!valid_lft || prefered_lft > valid_lft)
2194 return -EINVAL;
2195
2196 dev = __dev_get_by_index(net, ifindex);
2197 if (!dev)
2198 return -ENODEV;
2199
2200 idev = addrconf_add_dev(dev);
2201 if (IS_ERR(idev))
2202 return PTR_ERR(idev);
2203
2204 scope = ipv6_addr_scope(pfx);
2205
2206 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2207 if (addrconf_finite_timeout(timeout)) {
2208 expires = jiffies_to_clock_t(timeout * HZ);
2209 valid_lft = timeout;
2210 flags = RTF_EXPIRES;
2211 } else {
2212 expires = 0;
2213 flags = 0;
2214 ifa_flags |= IFA_F_PERMANENT;
2215 }
2216
2217 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2218 if (addrconf_finite_timeout(timeout)) {
2219 if (timeout == 0)
2220 ifa_flags |= IFA_F_DEPRECATED;
2221 prefered_lft = timeout;
2222 }
2223
2224 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2225
2226 if (!IS_ERR(ifp)) {
2227 spin_lock_bh(&ifp->lock);
2228 ifp->valid_lft = valid_lft;
2229 ifp->prefered_lft = prefered_lft;
2230 ifp->tstamp = jiffies;
2231 spin_unlock_bh(&ifp->lock);
2232
2233 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2234 expires, flags);
2235 /*
2236 * Note that section 3.1 of RFC 4429 indicates
2237 * that the Optimistic flag should not be set for
2238 * manually configured addresses
2239 */
2240 addrconf_dad_start(ifp);
2241 in6_ifa_put(ifp);
2242 addrconf_verify(0);
2243 return 0;
2244 }
2245
2246 return PTR_ERR(ifp);
2247}
2248
2249static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2250 unsigned int plen)
2251{
2252 struct inet6_ifaddr *ifp;
2253 struct inet6_dev *idev;
2254 struct net_device *dev;
2255
2256 if (plen > 128)
2257 return -EINVAL;
2258
2259 dev = __dev_get_by_index(net, ifindex);
2260 if (!dev)
2261 return -ENODEV;
2262
2263 if ((idev = __in6_dev_get(dev)) == NULL)
2264 return -ENXIO;
2265
2266 read_lock_bh(&idev->lock);
2267 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2268 if (ifp->prefix_len == plen &&
2269 ipv6_addr_equal(pfx, &ifp->addr)) {
2270 in6_ifa_hold(ifp);
2271 read_unlock_bh(&idev->lock);
2272
2273 ipv6_del_addr(ifp);
2274
2275 /* If the last address is deleted administratively,
2276 disable IPv6 on this interface.
2277 */
2278 if (list_empty(&idev->addr_list))
2279 addrconf_ifdown(idev->dev, 1);
2280 return 0;
2281 }
2282 }
2283 read_unlock_bh(&idev->lock);
2284 return -EADDRNOTAVAIL;
2285}
2286
2287
2288int addrconf_add_ifaddr(struct net *net, void __user *arg)
2289{
2290 struct in6_ifreq ireq;
2291 int err;
2292
2293 if (!capable(CAP_NET_ADMIN))
2294 return -EPERM;
2295
2296 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2297 return -EFAULT;
2298
2299 rtnl_lock();
2300 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2301 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2302 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2303 rtnl_unlock();
2304 return err;
2305}
2306
2307int addrconf_del_ifaddr(struct net *net, void __user *arg)
2308{
2309 struct in6_ifreq ireq;
2310 int err;
2311
2312 if (!capable(CAP_NET_ADMIN))
2313 return -EPERM;
2314
2315 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2316 return -EFAULT;
2317
2318 rtnl_lock();
2319 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2320 ireq.ifr6_prefixlen);
2321 rtnl_unlock();
2322 return err;
2323}
2324
2325static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2326 int plen, int scope)
2327{
2328 struct inet6_ifaddr *ifp;
2329
2330 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2331 if (!IS_ERR(ifp)) {
2332 spin_lock_bh(&ifp->lock);
2333 ifp->flags &= ~IFA_F_TENTATIVE;
2334 spin_unlock_bh(&ifp->lock);
2335 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2336 in6_ifa_put(ifp);
2337 }
2338}
2339
2340#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2341static void sit_add_v4_addrs(struct inet6_dev *idev)
2342{
2343 struct in6_addr addr;
2344 struct net_device *dev;
2345 struct net *net = dev_net(idev->dev);
2346 int scope;
2347
2348 ASSERT_RTNL();
2349
2350 memset(&addr, 0, sizeof(struct in6_addr));
2351 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2352
2353 if (idev->dev->flags&IFF_POINTOPOINT) {
2354 addr.s6_addr32[0] = htonl(0xfe800000);
2355 scope = IFA_LINK;
2356 } else {
2357 scope = IPV6_ADDR_COMPATv4;
2358 }
2359
2360 if (addr.s6_addr32[3]) {
2361 add_addr(idev, &addr, 128, scope);
2362 return;
2363 }
2364
2365 for_each_netdev(net, dev) {
2366 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2367 if (in_dev && (dev->flags & IFF_UP)) {
2368 struct in_ifaddr *ifa;
2369
2370 int flag = scope;
2371
2372 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2373 int plen;
2374
2375 addr.s6_addr32[3] = ifa->ifa_local;
2376
2377 if (ifa->ifa_scope == RT_SCOPE_LINK)
2378 continue;
2379 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2380 if (idev->dev->flags&IFF_POINTOPOINT)
2381 continue;
2382 flag |= IFA_HOST;
2383 }
2384 if (idev->dev->flags&IFF_POINTOPOINT)
2385 plen = 64;
2386 else
2387 plen = 96;
2388
2389 add_addr(idev, &addr, plen, flag);
2390 }
2391 }
2392 }
2393}
2394#endif
2395
2396static void init_loopback(struct net_device *dev)
2397{
2398 struct inet6_dev *idev;
2399
2400 /* ::1 */
2401
2402 ASSERT_RTNL();
2403
2404 if ((idev = ipv6_find_idev(dev)) == NULL) {
2405 pr_debug("%s: add_dev failed\n", __func__);
2406 return;
2407 }
2408
2409 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2410}
2411
2412static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2413{
2414 struct inet6_ifaddr *ifp;
2415 u32 addr_flags = IFA_F_PERMANENT;
2416
2417#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2418 if (idev->cnf.optimistic_dad &&
2419 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2420 addr_flags |= IFA_F_OPTIMISTIC;
2421#endif
2422
2423
2424 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2425 if (!IS_ERR(ifp)) {
2426 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2427 addrconf_dad_start(ifp);
2428 in6_ifa_put(ifp);
2429 }
2430}
2431
2432static void addrconf_dev_config(struct net_device *dev)
2433{
2434 struct in6_addr addr;
2435 struct inet6_dev *idev;
2436
2437 ASSERT_RTNL();
2438
2439 if ((dev->type != ARPHRD_ETHER) &&
2440 (dev->type != ARPHRD_FDDI) &&
2441 (dev->type != ARPHRD_ARCNET) &&
2442 (dev->type != ARPHRD_INFINIBAND) &&
2443 (dev->type != ARPHRD_IEEE802154)) {
2444 /* Alas, we support only Ethernet autoconfiguration. */
2445 return;
2446 }
2447
2448 idev = addrconf_add_dev(dev);
2449 if (IS_ERR(idev))
2450 return;
2451
2452 memset(&addr, 0, sizeof(struct in6_addr));
2453 addr.s6_addr32[0] = htonl(0xFE800000);
2454
2455 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2456 addrconf_add_linklocal(idev, &addr);
2457}
2458
2459#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2460static void addrconf_sit_config(struct net_device *dev)
2461{
2462 struct inet6_dev *idev;
2463
2464 ASSERT_RTNL();
2465
2466 /*
2467 * Configure the tunnel with one of our IPv4
2468 * addresses... we should configure all of
2469 * our v4 addrs in the tunnel
2470 */
2471
2472 if ((idev = ipv6_find_idev(dev)) == NULL) {
2473 pr_debug("%s: add_dev failed\n", __func__);
2474 return;
2475 }
2476
2477 if (dev->priv_flags & IFF_ISATAP) {
2478 struct in6_addr addr;
2479
2480 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2481 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2482 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2483 addrconf_add_linklocal(idev, &addr);
2484 return;
2485 }
2486
2487 sit_add_v4_addrs(idev);
2488
2489 if (dev->flags&IFF_POINTOPOINT) {
2490 addrconf_add_mroute(dev);
2491 addrconf_add_lroute(dev);
2492 } else
2493 sit_route_add(dev);
2494}
2495#endif
2496
2497#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2498static void addrconf_gre_config(struct net_device *dev)
2499{
2500 struct inet6_dev *idev;
2501 struct in6_addr addr;
2502
2503 pr_info("%s(%s)\n", __func__, dev->name);
2504
2505 ASSERT_RTNL();
2506
2507 if ((idev = ipv6_find_idev(dev)) == NULL) {
2508 pr_debug("%s: add_dev failed\n", __func__);
2509 return;
2510 }
2511
2512 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2513 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2514
2515 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2516 addrconf_add_linklocal(idev, &addr);
2517}
2518#endif
2519
2520static inline int
2521ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2522{
2523 struct in6_addr lladdr;
2524
2525 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2526 addrconf_add_linklocal(idev, &lladdr);
2527 return 0;
2528 }
2529 return -1;
2530}
2531
2532static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2533{
2534 struct net_device *link_dev;
2535 struct net *net = dev_net(idev->dev);
2536
2537 /* first try to inherit the link-local address from the link device */
2538 if (idev->dev->iflink &&
2539 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2540 if (!ipv6_inherit_linklocal(idev, link_dev))
2541 return;
2542 }
2543 /* then try to inherit it from any device */
2544 for_each_netdev(net, link_dev) {
2545 if (!ipv6_inherit_linklocal(idev, link_dev))
2546 return;
2547 }
2548 pr_debug("init ip6-ip6: add_linklocal failed\n");
2549}
2550
2551/*
2552 * Autoconfigure tunnel with a link-local address so routing protocols,
2553 * DHCPv6, MLD etc. can be run over the virtual link
2554 */
2555
2556static void addrconf_ip6_tnl_config(struct net_device *dev)
2557{
2558 struct inet6_dev *idev;
2559
2560 ASSERT_RTNL();
2561
2562 idev = addrconf_add_dev(dev);
2563 if (IS_ERR(idev)) {
2564 pr_debug("init ip6-ip6: add_dev failed\n");
2565 return;
2566 }
2567 ip6_tnl_add_linklocal(idev);
2568}
2569
2570static int addrconf_notify(struct notifier_block *this, unsigned long event,
2571 void *data)
2572{
2573 struct net_device *dev = (struct net_device *) data;
2574 struct inet6_dev *idev = __in6_dev_get(dev);
2575 int run_pending = 0;
2576 int err;
2577
2578 switch (event) {
2579 case NETDEV_REGISTER:
2580 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2581 idev = ipv6_add_dev(dev);
2582 if (!idev)
2583 return notifier_from_errno(-ENOMEM);
2584 }
2585 break;
2586
2587 case NETDEV_UP:
2588 case NETDEV_CHANGE:
2589 if (dev->flags & IFF_SLAVE)
2590 break;
2591
2592 if (event == NETDEV_UP) {
2593 if (!addrconf_qdisc_ok(dev)) {
2594 /* device is not ready yet. */
2595 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2596 dev->name);
2597 break;
2598 }
2599
2600 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2601 idev = ipv6_add_dev(dev);
2602
2603 if (idev) {
2604 idev->if_flags |= IF_READY;
2605 run_pending = 1;
2606 }
2607 } else {
2608 if (!addrconf_qdisc_ok(dev)) {
2609 /* device is still not ready. */
2610 break;
2611 }
2612
2613 if (idev) {
2614 if (idev->if_flags & IF_READY)
2615 /* device is already configured. */
2616 break;
2617 idev->if_flags |= IF_READY;
2618 }
2619
2620 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2621 dev->name);
2622
2623 run_pending = 1;
2624 }
2625
2626 switch (dev->type) {
2627#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2628 case ARPHRD_SIT:
2629 addrconf_sit_config(dev);
2630 break;
2631#endif
2632#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2633 case ARPHRD_IPGRE:
2634 addrconf_gre_config(dev);
2635 break;
2636#endif
2637 case ARPHRD_TUNNEL6:
2638 addrconf_ip6_tnl_config(dev);
2639 break;
2640 case ARPHRD_LOOPBACK:
2641 init_loopback(dev);
2642 break;
2643
2644 default:
2645 addrconf_dev_config(dev);
2646 break;
2647 }
2648
2649 if (idev) {
2650 if (run_pending)
2651 addrconf_dad_run(idev);
2652
2653 /*
2654 * If the MTU changed during the interface down,
2655 * when the interface up, the changed MTU must be
2656 * reflected in the idev as well as routers.
2657 */
2658 if (idev->cnf.mtu6 != dev->mtu &&
2659 dev->mtu >= IPV6_MIN_MTU) {
2660 rt6_mtu_change(dev, dev->mtu);
2661 idev->cnf.mtu6 = dev->mtu;
2662 }
2663 idev->tstamp = jiffies;
2664 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2665
2666 /*
2667 * If the changed mtu during down is lower than
2668 * IPV6_MIN_MTU stop IPv6 on this interface.
2669 */
2670 if (dev->mtu < IPV6_MIN_MTU)
2671 addrconf_ifdown(dev, 1);
2672 }
2673 break;
2674
2675 case NETDEV_CHANGEMTU:
2676 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2677 rt6_mtu_change(dev, dev->mtu);
2678 idev->cnf.mtu6 = dev->mtu;
2679 break;
2680 }
2681
2682 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2683 idev = ipv6_add_dev(dev);
2684 if (idev)
2685 break;
2686 }
2687
2688 /*
2689 * MTU falled under IPV6_MIN_MTU.
2690 * Stop IPv6 on this interface.
2691 */
2692
2693 case NETDEV_DOWN:
2694 case NETDEV_UNREGISTER:
2695 /*
2696 * Remove all addresses from this interface.
2697 */
2698 addrconf_ifdown(dev, event != NETDEV_DOWN);
2699 break;
2700
2701 case NETDEV_CHANGENAME:
2702 if (idev) {
2703 snmp6_unregister_dev(idev);
2704 addrconf_sysctl_unregister(idev);
2705 addrconf_sysctl_register(idev);
2706 err = snmp6_register_dev(idev);
2707 if (err)
2708 return notifier_from_errno(err);
2709 }
2710 break;
2711
2712 case NETDEV_PRE_TYPE_CHANGE:
2713 case NETDEV_POST_TYPE_CHANGE:
2714 addrconf_type_change(dev, event);
2715 break;
2716 }
2717
2718 return NOTIFY_OK;
2719}
2720
2721/*
2722 * addrconf module should be notified of a device going up
2723 */
2724static struct notifier_block ipv6_dev_notf = {
2725 .notifier_call = addrconf_notify,
2726};
2727
2728static void addrconf_type_change(struct net_device *dev, unsigned long event)
2729{
2730 struct inet6_dev *idev;
2731 ASSERT_RTNL();
2732
2733 idev = __in6_dev_get(dev);
2734
2735 if (event == NETDEV_POST_TYPE_CHANGE)
2736 ipv6_mc_remap(idev);
2737 else if (event == NETDEV_PRE_TYPE_CHANGE)
2738 ipv6_mc_unmap(idev);
2739}
2740
2741static int addrconf_ifdown(struct net_device *dev, int how)
2742{
2743 struct net *net = dev_net(dev);
2744 struct inet6_dev *idev;
2745 struct inet6_ifaddr *ifa;
2746 int state, i;
2747
2748 ASSERT_RTNL();
2749
2750 rt6_ifdown(net, dev);
2751 neigh_ifdown(&nd_tbl, dev);
2752
2753 idev = __in6_dev_get(dev);
2754 if (idev == NULL)
2755 return -ENODEV;
2756
2757 /*
2758 * Step 1: remove reference to ipv6 device from parent device.
2759 * Do not dev_put!
2760 */
2761 if (how) {
2762 idev->dead = 1;
2763
2764 /* protected by rtnl_lock */
2765 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2766
2767 /* Step 1.5: remove snmp6 entry */
2768 snmp6_unregister_dev(idev);
2769
2770 }
2771
2772 /* Step 2: clear hash table */
2773 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2774 struct hlist_head *h = &inet6_addr_lst[i];
2775 struct hlist_node *n;
2776
2777 spin_lock_bh(&addrconf_hash_lock);
2778 restart:
2779 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2780 if (ifa->idev == idev) {
2781 hlist_del_init_rcu(&ifa->addr_lst);
2782 addrconf_del_timer(ifa);
2783 goto restart;
2784 }
2785 }
2786 spin_unlock_bh(&addrconf_hash_lock);
2787 }
2788
2789 write_lock_bh(&idev->lock);
2790
2791 /* Step 2: clear flags for stateless addrconf */
2792 if (!how)
2793 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2794
2795#ifdef CONFIG_IPV6_PRIVACY
2796 if (how && del_timer(&idev->regen_timer))
2797 in6_dev_put(idev);
2798
2799 /* Step 3: clear tempaddr list */
2800 while (!list_empty(&idev->tempaddr_list)) {
2801 ifa = list_first_entry(&idev->tempaddr_list,
2802 struct inet6_ifaddr, tmp_list);
2803 list_del(&ifa->tmp_list);
2804 write_unlock_bh(&idev->lock);
2805 spin_lock_bh(&ifa->lock);
2806
2807 if (ifa->ifpub) {
2808 in6_ifa_put(ifa->ifpub);
2809 ifa->ifpub = NULL;
2810 }
2811 spin_unlock_bh(&ifa->lock);
2812 in6_ifa_put(ifa);
2813 write_lock_bh(&idev->lock);
2814 }
2815#endif
2816
2817 while (!list_empty(&idev->addr_list)) {
2818 ifa = list_first_entry(&idev->addr_list,
2819 struct inet6_ifaddr, if_list);
2820 addrconf_del_timer(ifa);
2821
2822 list_del(&ifa->if_list);
2823
2824 write_unlock_bh(&idev->lock);
2825
2826 spin_lock_bh(&ifa->state_lock);
2827 state = ifa->state;
2828 ifa->state = INET6_IFADDR_STATE_DEAD;
2829 spin_unlock_bh(&ifa->state_lock);
2830
2831 if (state != INET6_IFADDR_STATE_DEAD) {
2832 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2833 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2834 }
2835 in6_ifa_put(ifa);
2836
2837 write_lock_bh(&idev->lock);
2838 }
2839
2840 write_unlock_bh(&idev->lock);
2841
2842 /* Step 5: Discard multicast list */
2843 if (how)
2844 ipv6_mc_destroy_dev(idev);
2845 else
2846 ipv6_mc_down(idev);
2847
2848 idev->tstamp = jiffies;
2849
2850 /* Last: Shot the device (if unregistered) */
2851 if (how) {
2852 addrconf_sysctl_unregister(idev);
2853 neigh_parms_release(&nd_tbl, idev->nd_parms);
2854 neigh_ifdown(&nd_tbl, dev);
2855 in6_dev_put(idev);
2856 }
2857 return 0;
2858}
2859
2860static void addrconf_rs_timer(unsigned long data)
2861{
2862 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2863 struct inet6_dev *idev = ifp->idev;
2864
2865 read_lock(&idev->lock);
2866 if (idev->dead || !(idev->if_flags & IF_READY))
2867 goto out;
2868
2869 if (idev->cnf.forwarding)
2870 goto out;
2871
2872 /* Announcement received after solicitation was sent */
2873 if (idev->if_flags & IF_RA_RCVD)
2874 goto out;
2875
2876 spin_lock(&ifp->lock);
2877 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2878 /* The wait after the last probe can be shorter */
2879 addrconf_mod_timer(ifp, AC_RS,
2880 (ifp->probes == idev->cnf.rtr_solicits) ?
2881 idev->cnf.rtr_solicit_delay :
2882 idev->cnf.rtr_solicit_interval);
2883 spin_unlock(&ifp->lock);
2884
2885 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2886 } else {
2887 spin_unlock(&ifp->lock);
2888 /*
2889 * Note: we do not support deprecated "all on-link"
2890 * assumption any longer.
2891 */
2892 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
2893 }
2894
2895out:
2896 read_unlock(&idev->lock);
2897 in6_ifa_put(ifp);
2898}
2899
2900/*
2901 * Duplicate Address Detection
2902 */
2903static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2904{
2905 unsigned long rand_num;
2906 struct inet6_dev *idev = ifp->idev;
2907
2908 if (ifp->flags & IFA_F_OPTIMISTIC)
2909 rand_num = 0;
2910 else
2911 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2912
2913 ifp->probes = idev->cnf.dad_transmits;
2914 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2915}
2916
2917static void addrconf_dad_start(struct inet6_ifaddr *ifp)
2918{
2919 struct inet6_dev *idev = ifp->idev;
2920 struct net_device *dev = idev->dev;
2921
2922 addrconf_join_solict(dev, &ifp->addr);
2923
2924 net_srandom(ifp->addr.s6_addr32[3]);
2925
2926 read_lock_bh(&idev->lock);
2927 spin_lock(&ifp->lock);
2928 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2929 goto out;
2930
2931 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2932 idev->cnf.accept_dad < 1 ||
2933 !(ifp->flags&IFA_F_TENTATIVE) ||
2934 ifp->flags & IFA_F_NODAD) {
2935 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2936 spin_unlock(&ifp->lock);
2937 read_unlock_bh(&idev->lock);
2938
2939 addrconf_dad_completed(ifp);
2940 return;
2941 }
2942
2943 if (!(idev->if_flags & IF_READY)) {
2944 spin_unlock(&ifp->lock);
2945 read_unlock_bh(&idev->lock);
2946 /*
2947 * If the device is not ready:
2948 * - keep it tentative if it is a permanent address.
2949 * - otherwise, kill it.
2950 */
2951 in6_ifa_hold(ifp);
2952 addrconf_dad_stop(ifp, 0);
2953 return;
2954 }
2955
2956 /*
2957 * Optimistic nodes can start receiving
2958 * Frames right away
2959 */
2960 if (ifp->flags & IFA_F_OPTIMISTIC)
2961 ip6_ins_rt(ifp->rt);
2962
2963 addrconf_dad_kick(ifp);
2964out:
2965 spin_unlock(&ifp->lock);
2966 read_unlock_bh(&idev->lock);
2967}
2968
2969static void addrconf_dad_timer(unsigned long data)
2970{
2971 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2972 struct inet6_dev *idev = ifp->idev;
2973 struct in6_addr mcaddr;
2974
2975 if (!ifp->probes && addrconf_dad_end(ifp))
2976 goto out;
2977
2978 read_lock(&idev->lock);
2979 if (idev->dead || !(idev->if_flags & IF_READY)) {
2980 read_unlock(&idev->lock);
2981 goto out;
2982 }
2983
2984 spin_lock(&ifp->lock);
2985 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2986 spin_unlock(&ifp->lock);
2987 read_unlock(&idev->lock);
2988 goto out;
2989 }
2990
2991 if (ifp->probes == 0) {
2992 /*
2993 * DAD was successful
2994 */
2995
2996 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2997 spin_unlock(&ifp->lock);
2998 read_unlock(&idev->lock);
2999
3000 addrconf_dad_completed(ifp);
3001
3002 goto out;
3003 }
3004
3005 ifp->probes--;
3006 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3007 spin_unlock(&ifp->lock);
3008 read_unlock(&idev->lock);
3009
3010 /* send a neighbour solicitation for our addr */
3011 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3012 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3013out:
3014 in6_ifa_put(ifp);
3015}
3016
3017static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3018{
3019 struct net_device *dev = ifp->idev->dev;
3020
3021 /*
3022 * Configure the address for reception. Now it is valid.
3023 */
3024
3025 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3026
3027 /* If added prefix is link local and we are prepared to process
3028 router advertisements, start sending router solicitations.
3029 */
3030
3031 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3032 ifp->idev->cnf.accept_ra == 2) &&
3033 ifp->idev->cnf.rtr_solicits > 0 &&
3034 (dev->flags&IFF_LOOPBACK) == 0 &&
3035 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3036 /*
3037 * If a host as already performed a random delay
3038 * [...] as part of DAD [...] there is no need
3039 * to delay again before sending the first RS
3040 */
3041 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3042
3043 spin_lock_bh(&ifp->lock);
3044 ifp->probes = 1;
3045 ifp->idev->if_flags |= IF_RS_SENT;
3046 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3047 spin_unlock_bh(&ifp->lock);
3048 }
3049}
3050
3051static void addrconf_dad_run(struct inet6_dev *idev)
3052{
3053 struct inet6_ifaddr *ifp;
3054
3055 read_lock_bh(&idev->lock);
3056 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3057 spin_lock(&ifp->lock);
3058 if (ifp->flags & IFA_F_TENTATIVE &&
3059 ifp->state == INET6_IFADDR_STATE_DAD)
3060 addrconf_dad_kick(ifp);
3061 spin_unlock(&ifp->lock);
3062 }
3063 read_unlock_bh(&idev->lock);
3064}
3065
3066#ifdef CONFIG_PROC_FS
3067struct if6_iter_state {
3068 struct seq_net_private p;
3069 int bucket;
3070 int offset;
3071};
3072
3073static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3074{
3075 struct inet6_ifaddr *ifa = NULL;
3076 struct if6_iter_state *state = seq->private;
3077 struct net *net = seq_file_net(seq);
3078 int p = 0;
3079
3080 /* initial bucket if pos is 0 */
3081 if (pos == 0) {
3082 state->bucket = 0;
3083 state->offset = 0;
3084 }
3085
3086 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3087 struct hlist_node *n;
3088 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3089 addr_lst) {
3090 /* sync with offset */
3091 if (p < state->offset) {
3092 p++;
3093 continue;
3094 }
3095 state->offset++;
3096 if (net_eq(dev_net(ifa->idev->dev), net))
3097 return ifa;
3098 }
3099
3100 /* prepare for next bucket */
3101 state->offset = 0;
3102 p = 0;
3103 }
3104 return NULL;
3105}
3106
3107static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3108 struct inet6_ifaddr *ifa)
3109{
3110 struct if6_iter_state *state = seq->private;
3111 struct net *net = seq_file_net(seq);
3112 struct hlist_node *n = &ifa->addr_lst;
3113
3114 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3115 state->offset++;
3116 if (net_eq(dev_net(ifa->idev->dev), net))
3117 return ifa;
3118 }
3119
3120 while (++state->bucket < IN6_ADDR_HSIZE) {
3121 state->offset = 0;
3122 hlist_for_each_entry_rcu_bh(ifa, n,
3123 &inet6_addr_lst[state->bucket], addr_lst) {
3124 state->offset++;
3125 if (net_eq(dev_net(ifa->idev->dev), net))
3126 return ifa;
3127 }
3128 }
3129
3130 return NULL;
3131}
3132
3133static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3134 __acquires(rcu_bh)
3135{
3136 rcu_read_lock_bh();
3137 return if6_get_first(seq, *pos);
3138}
3139
3140static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3141{
3142 struct inet6_ifaddr *ifa;
3143
3144 ifa = if6_get_next(seq, v);
3145 ++*pos;
3146 return ifa;
3147}
3148
3149static void if6_seq_stop(struct seq_file *seq, void *v)
3150 __releases(rcu_bh)
3151{
3152 rcu_read_unlock_bh();
3153}
3154
3155static int if6_seq_show(struct seq_file *seq, void *v)
3156{
3157 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3158 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3159 &ifp->addr,
3160 ifp->idev->dev->ifindex,
3161 ifp->prefix_len,
3162 ifp->scope,
3163 ifp->flags,
3164 ifp->idev->dev->name);
3165 return 0;
3166}
3167
3168static const struct seq_operations if6_seq_ops = {
3169 .start = if6_seq_start,
3170 .next = if6_seq_next,
3171 .show = if6_seq_show,
3172 .stop = if6_seq_stop,
3173};
3174
3175static int if6_seq_open(struct inode *inode, struct file *file)
3176{
3177 return seq_open_net(inode, file, &if6_seq_ops,
3178 sizeof(struct if6_iter_state));
3179}
3180
3181static const struct file_operations if6_fops = {
3182 .owner = THIS_MODULE,
3183 .open = if6_seq_open,
3184 .read = seq_read,
3185 .llseek = seq_lseek,
3186 .release = seq_release_net,
3187};
3188
3189static int __net_init if6_proc_net_init(struct net *net)
3190{
3191 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3192 return -ENOMEM;
3193 return 0;
3194}
3195
3196static void __net_exit if6_proc_net_exit(struct net *net)
3197{
3198 proc_net_remove(net, "if_inet6");
3199}
3200
3201static struct pernet_operations if6_proc_net_ops = {
3202 .init = if6_proc_net_init,
3203 .exit = if6_proc_net_exit,
3204};
3205
3206int __init if6_proc_init(void)
3207{
3208 return register_pernet_subsys(&if6_proc_net_ops);
3209}
3210
3211void if6_proc_exit(void)
3212{
3213 unregister_pernet_subsys(&if6_proc_net_ops);
3214}
3215#endif /* CONFIG_PROC_FS */
3216
3217#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3218/* Check if address is a home address configured on any interface. */
3219int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3220{
3221 int ret = 0;
3222 struct inet6_ifaddr *ifp = NULL;
3223 struct hlist_node *n;
3224 unsigned int hash = ipv6_addr_hash(addr);
3225
3226 rcu_read_lock_bh();
3227 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3228 if (!net_eq(dev_net(ifp->idev->dev), net))
3229 continue;
3230 if (ipv6_addr_equal(&ifp->addr, addr) &&
3231 (ifp->flags & IFA_F_HOMEADDRESS)) {
3232 ret = 1;
3233 break;
3234 }
3235 }
3236 rcu_read_unlock_bh();
3237 return ret;
3238}
3239#endif
3240
3241/*
3242 * Periodic address status verification
3243 */
3244
3245static void addrconf_verify(unsigned long foo)
3246{
3247 unsigned long now, next, next_sec, next_sched;
3248 struct inet6_ifaddr *ifp;
3249 struct hlist_node *node;
3250 int i;
3251
3252 rcu_read_lock_bh();
3253 spin_lock(&addrconf_verify_lock);
3254 now = jiffies;
3255 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3256
3257 del_timer(&addr_chk_timer);
3258
3259 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3260restart:
3261 hlist_for_each_entry_rcu_bh(ifp, node,
3262 &inet6_addr_lst[i], addr_lst) {
3263 unsigned long age;
3264
3265 if (ifp->flags & IFA_F_PERMANENT)
3266 continue;
3267
3268 spin_lock(&ifp->lock);
3269 /* We try to batch several events at once. */
3270 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3271
3272 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3273 age >= ifp->valid_lft) {
3274 spin_unlock(&ifp->lock);
3275 in6_ifa_hold(ifp);
3276 ipv6_del_addr(ifp);
3277 goto restart;
3278 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3279 spin_unlock(&ifp->lock);
3280 continue;
3281 } else if (age >= ifp->prefered_lft) {
3282 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3283 int deprecate = 0;
3284
3285 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3286 deprecate = 1;
3287 ifp->flags |= IFA_F_DEPRECATED;
3288 }
3289
3290 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3291 next = ifp->tstamp + ifp->valid_lft * HZ;
3292
3293 spin_unlock(&ifp->lock);
3294
3295 if (deprecate) {
3296 in6_ifa_hold(ifp);
3297
3298 ipv6_ifa_notify(0, ifp);
3299 in6_ifa_put(ifp);
3300 goto restart;
3301 }
3302#ifdef CONFIG_IPV6_PRIVACY
3303 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3304 !(ifp->flags&IFA_F_TENTATIVE)) {
3305 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3306 ifp->idev->cnf.dad_transmits *
3307 ifp->idev->nd_parms->retrans_time / HZ;
3308
3309 if (age >= ifp->prefered_lft - regen_advance) {
3310 struct inet6_ifaddr *ifpub = ifp->ifpub;
3311 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3312 next = ifp->tstamp + ifp->prefered_lft * HZ;
3313 if (!ifp->regen_count && ifpub) {
3314 ifp->regen_count++;
3315 in6_ifa_hold(ifp);
3316 in6_ifa_hold(ifpub);
3317 spin_unlock(&ifp->lock);
3318
3319 spin_lock(&ifpub->lock);
3320 ifpub->regen_count = 0;
3321 spin_unlock(&ifpub->lock);
3322 ipv6_create_tempaddr(ifpub, ifp);
3323 in6_ifa_put(ifpub);
3324 in6_ifa_put(ifp);
3325 goto restart;
3326 }
3327 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3328 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3329 spin_unlock(&ifp->lock);
3330#endif
3331 } else {
3332 /* ifp->prefered_lft <= ifp->valid_lft */
3333 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3334 next = ifp->tstamp + ifp->prefered_lft * HZ;
3335 spin_unlock(&ifp->lock);
3336 }
3337 }
3338 }
3339
3340 next_sec = round_jiffies_up(next);
3341 next_sched = next;
3342
3343 /* If rounded timeout is accurate enough, accept it. */
3344 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3345 next_sched = next_sec;
3346
3347 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3348 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3349 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3350
3351 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3352 now, next, next_sec, next_sched));
3353
3354 addr_chk_timer.expires = next_sched;
3355 add_timer(&addr_chk_timer);
3356 spin_unlock(&addrconf_verify_lock);
3357 rcu_read_unlock_bh();
3358}
3359
3360static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3361{
3362 struct in6_addr *pfx = NULL;
3363
3364 if (addr)
3365 pfx = nla_data(addr);
3366
3367 if (local) {
3368 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3369 pfx = NULL;
3370 else
3371 pfx = nla_data(local);
3372 }
3373
3374 return pfx;
3375}
3376
3377static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3378 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3379 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3380 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3381};
3382
3383static int
3384inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3385{
3386 struct net *net = sock_net(skb->sk);
3387 struct ifaddrmsg *ifm;
3388 struct nlattr *tb[IFA_MAX+1];
3389 struct in6_addr *pfx;
3390 int err;
3391
3392 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3393 if (err < 0)
3394 return err;
3395
3396 ifm = nlmsg_data(nlh);
3397 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3398 if (pfx == NULL)
3399 return -EINVAL;
3400
3401 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3402}
3403
3404static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3405 u32 prefered_lft, u32 valid_lft)
3406{
3407 u32 flags;
3408 clock_t expires;
3409 unsigned long timeout;
3410
3411 if (!valid_lft || (prefered_lft > valid_lft))
3412 return -EINVAL;
3413
3414 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3415 if (addrconf_finite_timeout(timeout)) {
3416 expires = jiffies_to_clock_t(timeout * HZ);
3417 valid_lft = timeout;
3418 flags = RTF_EXPIRES;
3419 } else {
3420 expires = 0;
3421 flags = 0;
3422 ifa_flags |= IFA_F_PERMANENT;
3423 }
3424
3425 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3426 if (addrconf_finite_timeout(timeout)) {
3427 if (timeout == 0)
3428 ifa_flags |= IFA_F_DEPRECATED;
3429 prefered_lft = timeout;
3430 }
3431
3432 spin_lock_bh(&ifp->lock);
3433 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3434 ifp->tstamp = jiffies;
3435 ifp->valid_lft = valid_lft;
3436 ifp->prefered_lft = prefered_lft;
3437
3438 spin_unlock_bh(&ifp->lock);
3439 if (!(ifp->flags&IFA_F_TENTATIVE))
3440 ipv6_ifa_notify(0, ifp);
3441
3442 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3443 expires, flags);
3444 addrconf_verify(0);
3445
3446 return 0;
3447}
3448
3449static int
3450inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3451{
3452 struct net *net = sock_net(skb->sk);
3453 struct ifaddrmsg *ifm;
3454 struct nlattr *tb[IFA_MAX+1];
3455 struct in6_addr *pfx;
3456 struct inet6_ifaddr *ifa;
3457 struct net_device *dev;
3458 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3459 u8 ifa_flags;
3460 int err;
3461
3462 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3463 if (err < 0)
3464 return err;
3465
3466 ifm = nlmsg_data(nlh);
3467 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3468 if (pfx == NULL)
3469 return -EINVAL;
3470
3471 if (tb[IFA_CACHEINFO]) {
3472 struct ifa_cacheinfo *ci;
3473
3474 ci = nla_data(tb[IFA_CACHEINFO]);
3475 valid_lft = ci->ifa_valid;
3476 preferred_lft = ci->ifa_prefered;
3477 } else {
3478 preferred_lft = INFINITY_LIFE_TIME;
3479 valid_lft = INFINITY_LIFE_TIME;
3480 }
3481
3482 dev = __dev_get_by_index(net, ifm->ifa_index);
3483 if (dev == NULL)
3484 return -ENODEV;
3485
3486 /* We ignore other flags so far. */
3487 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3488
3489 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3490 if (ifa == NULL) {
3491 /*
3492 * It would be best to check for !NLM_F_CREATE here but
3493 * userspace alreay relies on not having to provide this.
3494 */
3495 return inet6_addr_add(net, ifm->ifa_index, pfx,
3496 ifm->ifa_prefixlen, ifa_flags,
3497 preferred_lft, valid_lft);
3498 }
3499
3500 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3501 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3502 err = -EEXIST;
3503 else
3504 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3505
3506 in6_ifa_put(ifa);
3507
3508 return err;
3509}
3510
3511static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3512 u8 scope, int ifindex)
3513{
3514 struct ifaddrmsg *ifm;
3515
3516 ifm = nlmsg_data(nlh);
3517 ifm->ifa_family = AF_INET6;
3518 ifm->ifa_prefixlen = prefixlen;
3519 ifm->ifa_flags = flags;
3520 ifm->ifa_scope = scope;
3521 ifm->ifa_index = ifindex;
3522}
3523
3524static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3525 unsigned long tstamp, u32 preferred, u32 valid)
3526{
3527 struct ifa_cacheinfo ci;
3528
3529 ci.cstamp = cstamp_delta(cstamp);
3530 ci.tstamp = cstamp_delta(tstamp);
3531 ci.ifa_prefered = preferred;
3532 ci.ifa_valid = valid;
3533
3534 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3535}
3536
3537static inline int rt_scope(int ifa_scope)
3538{
3539 if (ifa_scope & IFA_HOST)
3540 return RT_SCOPE_HOST;
3541 else if (ifa_scope & IFA_LINK)
3542 return RT_SCOPE_LINK;
3543 else if (ifa_scope & IFA_SITE)
3544 return RT_SCOPE_SITE;
3545 else
3546 return RT_SCOPE_UNIVERSE;
3547}
3548
3549static inline int inet6_ifaddr_msgsize(void)
3550{
3551 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3552 + nla_total_size(16) /* IFA_ADDRESS */
3553 + nla_total_size(sizeof(struct ifa_cacheinfo));
3554}
3555
3556static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3557 u32 pid, u32 seq, int event, unsigned int flags)
3558{
3559 struct nlmsghdr *nlh;
3560 u32 preferred, valid;
3561
3562 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3563 if (nlh == NULL)
3564 return -EMSGSIZE;
3565
3566 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3567 ifa->idev->dev->ifindex);
3568
3569 if (!(ifa->flags&IFA_F_PERMANENT)) {
3570 preferred = ifa->prefered_lft;
3571 valid = ifa->valid_lft;
3572 if (preferred != INFINITY_LIFE_TIME) {
3573 long tval = (jiffies - ifa->tstamp)/HZ;
3574 if (preferred > tval)
3575 preferred -= tval;
3576 else
3577 preferred = 0;
3578 if (valid != INFINITY_LIFE_TIME) {
3579 if (valid > tval)
3580 valid -= tval;
3581 else
3582 valid = 0;
3583 }
3584 }
3585 } else {
3586 preferred = INFINITY_LIFE_TIME;
3587 valid = INFINITY_LIFE_TIME;
3588 }
3589
3590 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3591 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3592 nlmsg_cancel(skb, nlh);
3593 return -EMSGSIZE;
3594 }
3595
3596 return nlmsg_end(skb, nlh);
3597}
3598
3599static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3600 u32 pid, u32 seq, int event, u16 flags)
3601{
3602 struct nlmsghdr *nlh;
3603 u8 scope = RT_SCOPE_UNIVERSE;
3604 int ifindex = ifmca->idev->dev->ifindex;
3605
3606 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3607 scope = RT_SCOPE_SITE;
3608
3609 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3610 if (nlh == NULL)
3611 return -EMSGSIZE;
3612
3613 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3614 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3615 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3616 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3617 nlmsg_cancel(skb, nlh);
3618 return -EMSGSIZE;
3619 }
3620
3621 return nlmsg_end(skb, nlh);
3622}
3623
3624static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3625 u32 pid, u32 seq, int event, unsigned int flags)
3626{
3627 struct nlmsghdr *nlh;
3628 u8 scope = RT_SCOPE_UNIVERSE;
3629 int ifindex = ifaca->aca_idev->dev->ifindex;
3630
3631 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3632 scope = RT_SCOPE_SITE;
3633
3634 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3635 if (nlh == NULL)
3636 return -EMSGSIZE;
3637
3638 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3639 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3640 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3641 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3642 nlmsg_cancel(skb, nlh);
3643 return -EMSGSIZE;
3644 }
3645
3646 return nlmsg_end(skb, nlh);
3647}
3648
3649enum addr_type_t {
3650 UNICAST_ADDR,
3651 MULTICAST_ADDR,
3652 ANYCAST_ADDR,
3653};
3654
3655/* called with rcu_read_lock() */
3656static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3657 struct netlink_callback *cb, enum addr_type_t type,
3658 int s_ip_idx, int *p_ip_idx)
3659{
3660 struct ifmcaddr6 *ifmca;
3661 struct ifacaddr6 *ifaca;
3662 int err = 1;
3663 int ip_idx = *p_ip_idx;
3664
3665 read_lock_bh(&idev->lock);
3666 switch (type) {
3667 case UNICAST_ADDR: {
3668 struct inet6_ifaddr *ifa;
3669
3670 /* unicast address incl. temp addr */
3671 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3672 if (++ip_idx < s_ip_idx)
3673 continue;
3674 err = inet6_fill_ifaddr(skb, ifa,
3675 NETLINK_CB(cb->skb).pid,
3676 cb->nlh->nlmsg_seq,
3677 RTM_NEWADDR,
3678 NLM_F_MULTI);
3679 if (err <= 0)
3680 break;
3681 }
3682 break;
3683 }
3684 case MULTICAST_ADDR:
3685 /* multicast address */
3686 for (ifmca = idev->mc_list; ifmca;
3687 ifmca = ifmca->next, ip_idx++) {
3688 if (ip_idx < s_ip_idx)
3689 continue;
3690 err = inet6_fill_ifmcaddr(skb, ifmca,
3691 NETLINK_CB(cb->skb).pid,
3692 cb->nlh->nlmsg_seq,
3693 RTM_GETMULTICAST,
3694 NLM_F_MULTI);
3695 if (err <= 0)
3696 break;
3697 }
3698 break;
3699 case ANYCAST_ADDR:
3700 /* anycast address */
3701 for (ifaca = idev->ac_list; ifaca;
3702 ifaca = ifaca->aca_next, ip_idx++) {
3703 if (ip_idx < s_ip_idx)
3704 continue;
3705 err = inet6_fill_ifacaddr(skb, ifaca,
3706 NETLINK_CB(cb->skb).pid,
3707 cb->nlh->nlmsg_seq,
3708 RTM_GETANYCAST,
3709 NLM_F_MULTI);
3710 if (err <= 0)
3711 break;
3712 }
3713 break;
3714 default:
3715 break;
3716 }
3717 read_unlock_bh(&idev->lock);
3718 *p_ip_idx = ip_idx;
3719 return err;
3720}
3721
3722static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3723 enum addr_type_t type)
3724{
3725 struct net *net = sock_net(skb->sk);
3726 int h, s_h;
3727 int idx, ip_idx;
3728 int s_idx, s_ip_idx;
3729 struct net_device *dev;
3730 struct inet6_dev *idev;
3731 struct hlist_head *head;
3732 struct hlist_node *node;
3733
3734 s_h = cb->args[0];
3735 s_idx = idx = cb->args[1];
3736 s_ip_idx = ip_idx = cb->args[2];
3737
3738 rcu_read_lock();
3739 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3740 idx = 0;
3741 head = &net->dev_index_head[h];
3742 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3743 if (idx < s_idx)
3744 goto cont;
3745 if (h > s_h || idx > s_idx)
3746 s_ip_idx = 0;
3747 ip_idx = 0;
3748 idev = __in6_dev_get(dev);
3749 if (!idev)
3750 goto cont;
3751
3752 if (in6_dump_addrs(idev, skb, cb, type,
3753 s_ip_idx, &ip_idx) <= 0)
3754 goto done;
3755cont:
3756 idx++;
3757 }
3758 }
3759done:
3760 rcu_read_unlock();
3761 cb->args[0] = h;
3762 cb->args[1] = idx;
3763 cb->args[2] = ip_idx;
3764
3765 return skb->len;
3766}
3767
3768static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3769{
3770 enum addr_type_t type = UNICAST_ADDR;
3771
3772 return inet6_dump_addr(skb, cb, type);
3773}
3774
3775static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3776{
3777 enum addr_type_t type = MULTICAST_ADDR;
3778
3779 return inet6_dump_addr(skb, cb, type);
3780}
3781
3782
3783static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3784{
3785 enum addr_type_t type = ANYCAST_ADDR;
3786
3787 return inet6_dump_addr(skb, cb, type);
3788}
3789
3790static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3791 void *arg)
3792{
3793 struct net *net = sock_net(in_skb->sk);
3794 struct ifaddrmsg *ifm;
3795 struct nlattr *tb[IFA_MAX+1];
3796 struct in6_addr *addr = NULL;
3797 struct net_device *dev = NULL;
3798 struct inet6_ifaddr *ifa;
3799 struct sk_buff *skb;
3800 int err;
3801
3802 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3803 if (err < 0)
3804 goto errout;
3805
3806 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3807 if (addr == NULL) {
3808 err = -EINVAL;
3809 goto errout;
3810 }
3811
3812 ifm = nlmsg_data(nlh);
3813 if (ifm->ifa_index)
3814 dev = __dev_get_by_index(net, ifm->ifa_index);
3815
3816 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3817 if (!ifa) {
3818 err = -EADDRNOTAVAIL;
3819 goto errout;
3820 }
3821
3822 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3823 if (!skb) {
3824 err = -ENOBUFS;
3825 goto errout_ifa;
3826 }
3827
3828 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3829 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3830 if (err < 0) {
3831 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3832 WARN_ON(err == -EMSGSIZE);
3833 kfree_skb(skb);
3834 goto errout_ifa;
3835 }
3836 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3837errout_ifa:
3838 in6_ifa_put(ifa);
3839errout:
3840 return err;
3841}
3842
3843static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3844{
3845 struct sk_buff *skb;
3846 struct net *net = dev_net(ifa->idev->dev);
3847 int err = -ENOBUFS;
3848
3849 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3850 if (skb == NULL)
3851 goto errout;
3852
3853 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3854 if (err < 0) {
3855 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3856 WARN_ON(err == -EMSGSIZE);
3857 kfree_skb(skb);
3858 goto errout;
3859 }
3860 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3861 return;
3862errout:
3863 if (err < 0)
3864 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3865}
3866
3867static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3868 __s32 *array, int bytes)
3869{
3870 BUG_ON(bytes < (DEVCONF_MAX * 4));
3871
3872 memset(array, 0, bytes);
3873 array[DEVCONF_FORWARDING] = cnf->forwarding;
3874 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3875 array[DEVCONF_MTU6] = cnf->mtu6;
3876 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3877 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3878 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3879 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3880 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3881 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3882 jiffies_to_msecs(cnf->rtr_solicit_interval);
3883 array[DEVCONF_RTR_SOLICIT_DELAY] =
3884 jiffies_to_msecs(cnf->rtr_solicit_delay);
3885 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3886#ifdef CONFIG_IPV6_PRIVACY
3887 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3888 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3889 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3890 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3891 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3892#endif
3893 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3894 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3895 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3896#ifdef CONFIG_IPV6_ROUTER_PREF
3897 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3898 array[DEVCONF_RTR_PROBE_INTERVAL] =
3899 jiffies_to_msecs(cnf->rtr_probe_interval);
3900#ifdef CONFIG_IPV6_ROUTE_INFO
3901 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3902#endif
3903#endif
3904 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3905 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3906#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3907 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3908#endif
3909#ifdef CONFIG_IPV6_MROUTE
3910 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3911#endif
3912 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3913 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3914 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3915}
3916
3917static inline size_t inet6_ifla6_size(void)
3918{
3919 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3920 + nla_total_size(sizeof(struct ifla_cacheinfo))
3921 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3922 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3923 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3924}
3925
3926static inline size_t inet6_if_nlmsg_size(void)
3927{
3928 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3929 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3930 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3931 + nla_total_size(4) /* IFLA_MTU */
3932 + nla_total_size(4) /* IFLA_LINK */
3933 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3934}
3935
3936static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3937 int items, int bytes)
3938{
3939 int i;
3940 int pad = bytes - sizeof(u64) * items;
3941 BUG_ON(pad < 0);
3942
3943 /* Use put_unaligned() because stats may not be aligned for u64. */
3944 put_unaligned(items, &stats[0]);
3945 for (i = 1; i < items; i++)
3946 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3947
3948 memset(&stats[items], 0, pad);
3949}
3950
3951static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3952 int items, int bytes, size_t syncpoff)
3953{
3954 int i;
3955 int pad = bytes - sizeof(u64) * items;
3956 BUG_ON(pad < 0);
3957
3958 /* Use put_unaligned() because stats may not be aligned for u64. */
3959 put_unaligned(items, &stats[0]);
3960 for (i = 1; i < items; i++)
3961 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3962
3963 memset(&stats[items], 0, pad);
3964}
3965
3966static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3967 int bytes)
3968{
3969 switch (attrtype) {
3970 case IFLA_INET6_STATS:
3971 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3972 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3973 break;
3974 case IFLA_INET6_ICMP6STATS:
3975 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3976 break;
3977 }
3978}
3979
3980static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3981{
3982 struct nlattr *nla;
3983 struct ifla_cacheinfo ci;
3984
3985 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
3986 goto nla_put_failure;
3987 ci.max_reasm_len = IPV6_MAXPLEN;
3988 ci.tstamp = cstamp_delta(idev->tstamp);
3989 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3990 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3991 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
3992 goto nla_put_failure;
3993 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3994 if (nla == NULL)
3995 goto nla_put_failure;
3996 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3997
3998 /* XXX - MC not implemented */
3999
4000 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4001 if (nla == NULL)
4002 goto nla_put_failure;
4003 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4004
4005 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4006 if (nla == NULL)
4007 goto nla_put_failure;
4008 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4009
4010 return 0;
4011
4012nla_put_failure:
4013 return -EMSGSIZE;
4014}
4015
4016static size_t inet6_get_link_af_size(const struct net_device *dev)
4017{
4018 if (!__in6_dev_get(dev))
4019 return 0;
4020
4021 return inet6_ifla6_size();
4022}
4023
4024static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4025{
4026 struct inet6_dev *idev = __in6_dev_get(dev);
4027
4028 if (!idev)
4029 return -ENODATA;
4030
4031 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4032 return -EMSGSIZE;
4033
4034 return 0;
4035}
4036
4037static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4038 u32 pid, u32 seq, int event, unsigned int flags)
4039{
4040 struct net_device *dev = idev->dev;
4041 struct ifinfomsg *hdr;
4042 struct nlmsghdr *nlh;
4043 void *protoinfo;
4044
4045 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
4046 if (nlh == NULL)
4047 return -EMSGSIZE;
4048
4049 hdr = nlmsg_data(nlh);
4050 hdr->ifi_family = AF_INET6;
4051 hdr->__ifi_pad = 0;
4052 hdr->ifi_type = dev->type;
4053 hdr->ifi_index = dev->ifindex;
4054 hdr->ifi_flags = dev_get_flags(dev);
4055 hdr->ifi_change = 0;
4056
4057 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4058 (dev->addr_len &&
4059 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4060 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4061 (dev->ifindex != dev->iflink &&
4062 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4063 goto nla_put_failure;
4064 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4065 if (protoinfo == NULL)
4066 goto nla_put_failure;
4067
4068 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4069 goto nla_put_failure;
4070
4071 nla_nest_end(skb, protoinfo);
4072 return nlmsg_end(skb, nlh);
4073
4074nla_put_failure:
4075 nlmsg_cancel(skb, nlh);
4076 return -EMSGSIZE;
4077}
4078
4079static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4080{
4081 struct net *net = sock_net(skb->sk);
4082 int h, s_h;
4083 int idx = 0, s_idx;
4084 struct net_device *dev;
4085 struct inet6_dev *idev;
4086 struct hlist_head *head;
4087 struct hlist_node *node;
4088
4089 s_h = cb->args[0];
4090 s_idx = cb->args[1];
4091
4092 rcu_read_lock();
4093 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4094 idx = 0;
4095 head = &net->dev_index_head[h];
4096 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4097 if (idx < s_idx)
4098 goto cont;
4099 idev = __in6_dev_get(dev);
4100 if (!idev)
4101 goto cont;
4102 if (inet6_fill_ifinfo(skb, idev,
4103 NETLINK_CB(cb->skb).pid,
4104 cb->nlh->nlmsg_seq,
4105 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4106 goto out;
4107cont:
4108 idx++;
4109 }
4110 }
4111out:
4112 rcu_read_unlock();
4113 cb->args[1] = idx;
4114 cb->args[0] = h;
4115
4116 return skb->len;
4117}
4118
4119void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4120{
4121 struct sk_buff *skb;
4122 struct net *net = dev_net(idev->dev);
4123 int err = -ENOBUFS;
4124
4125 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4126 if (skb == NULL)
4127 goto errout;
4128
4129 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4130 if (err < 0) {
4131 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4132 WARN_ON(err == -EMSGSIZE);
4133 kfree_skb(skb);
4134 goto errout;
4135 }
4136 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4137 return;
4138errout:
4139 if (err < 0)
4140 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4141}
4142
4143static inline size_t inet6_prefix_nlmsg_size(void)
4144{
4145 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4146 + nla_total_size(sizeof(struct in6_addr))
4147 + nla_total_size(sizeof(struct prefix_cacheinfo));
4148}
4149
4150static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4151 struct prefix_info *pinfo, u32 pid, u32 seq,
4152 int event, unsigned int flags)
4153{
4154 struct prefixmsg *pmsg;
4155 struct nlmsghdr *nlh;
4156 struct prefix_cacheinfo ci;
4157
4158 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4159 if (nlh == NULL)
4160 return -EMSGSIZE;
4161
4162 pmsg = nlmsg_data(nlh);
4163 pmsg->prefix_family = AF_INET6;
4164 pmsg->prefix_pad1 = 0;
4165 pmsg->prefix_pad2 = 0;
4166 pmsg->prefix_ifindex = idev->dev->ifindex;
4167 pmsg->prefix_len = pinfo->prefix_len;
4168 pmsg->prefix_type = pinfo->type;
4169 pmsg->prefix_pad3 = 0;
4170 pmsg->prefix_flags = 0;
4171 if (pinfo->onlink)
4172 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4173 if (pinfo->autoconf)
4174 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4175
4176 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4177 goto nla_put_failure;
4178 ci.preferred_time = ntohl(pinfo->prefered);
4179 ci.valid_time = ntohl(pinfo->valid);
4180 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4181 goto nla_put_failure;
4182 return nlmsg_end(skb, nlh);
4183
4184nla_put_failure:
4185 nlmsg_cancel(skb, nlh);
4186 return -EMSGSIZE;
4187}
4188
4189static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4190 struct prefix_info *pinfo)
4191{
4192 struct sk_buff *skb;
4193 struct net *net = dev_net(idev->dev);
4194 int err = -ENOBUFS;
4195
4196 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4197 if (skb == NULL)
4198 goto errout;
4199
4200 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4201 if (err < 0) {
4202 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4203 WARN_ON(err == -EMSGSIZE);
4204 kfree_skb(skb);
4205 goto errout;
4206 }
4207 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4208 return;
4209errout:
4210 if (err < 0)
4211 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4212}
4213
4214static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4215{
4216 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4217
4218 switch (event) {
4219 case RTM_NEWADDR:
4220 /*
4221 * If the address was optimistic
4222 * we inserted the route at the start of
4223 * our DAD process, so we don't need
4224 * to do it again
4225 */
4226 if (!(ifp->rt->rt6i_node))
4227 ip6_ins_rt(ifp->rt);
4228 if (ifp->idev->cnf.forwarding)
4229 addrconf_join_anycast(ifp);
4230 break;
4231 case RTM_DELADDR:
4232 if (ifp->idev->cnf.forwarding)
4233 addrconf_leave_anycast(ifp);
4234 addrconf_leave_solict(ifp->idev, &ifp->addr);
4235 dst_hold(&ifp->rt->dst);
4236
4237 if (ip6_del_rt(ifp->rt))
4238 dst_free(&ifp->rt->dst);
4239 break;
4240 }
4241}
4242
4243static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4244{
4245 rcu_read_lock_bh();
4246 if (likely(ifp->idev->dead == 0))
4247 __ipv6_ifa_notify(event, ifp);
4248 rcu_read_unlock_bh();
4249}
4250
4251#ifdef CONFIG_SYSCTL
4252
4253static
4254int addrconf_sysctl_forward(ctl_table *ctl, int write,
4255 void __user *buffer, size_t *lenp, loff_t *ppos)
4256{
4257 int *valp = ctl->data;
4258 int val = *valp;
4259 loff_t pos = *ppos;
4260 ctl_table lctl;
4261 int ret;
4262
4263 /*
4264 * ctl->data points to idev->cnf.forwarding, we should
4265 * not modify it until we get the rtnl lock.
4266 */
4267 lctl = *ctl;
4268 lctl.data = &val;
4269
4270 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4271
4272 if (write)
4273 ret = addrconf_fixup_forwarding(ctl, valp, val);
4274 if (ret)
4275 *ppos = pos;
4276 return ret;
4277}
4278
4279static void dev_disable_change(struct inet6_dev *idev)
4280{
4281 if (!idev || !idev->dev)
4282 return;
4283
4284 if (idev->cnf.disable_ipv6)
4285 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4286 else
4287 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4288}
4289
4290static void addrconf_disable_change(struct net *net, __s32 newf)
4291{
4292 struct net_device *dev;
4293 struct inet6_dev *idev;
4294
4295 rcu_read_lock();
4296 for_each_netdev_rcu(net, dev) {
4297 idev = __in6_dev_get(dev);
4298 if (idev) {
4299 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4300 idev->cnf.disable_ipv6 = newf;
4301 if (changed)
4302 dev_disable_change(idev);
4303 }
4304 }
4305 rcu_read_unlock();
4306}
4307
4308static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4309{
4310 struct net *net;
4311 int old;
4312
4313 if (!rtnl_trylock())
4314 return restart_syscall();
4315
4316 net = (struct net *)table->extra2;
4317 old = *p;
4318 *p = newf;
4319
4320 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4321 rtnl_unlock();
4322 return 0;
4323 }
4324
4325 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4326 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4327 addrconf_disable_change(net, newf);
4328 } else if ((!newf) ^ (!old))
4329 dev_disable_change((struct inet6_dev *)table->extra1);
4330
4331 rtnl_unlock();
4332 return 0;
4333}
4334
4335static
4336int addrconf_sysctl_disable(ctl_table *ctl, int write,
4337 void __user *buffer, size_t *lenp, loff_t *ppos)
4338{
4339 int *valp = ctl->data;
4340 int val = *valp;
4341 loff_t pos = *ppos;
4342 ctl_table lctl;
4343 int ret;
4344
4345 /*
4346 * ctl->data points to idev->cnf.disable_ipv6, we should
4347 * not modify it until we get the rtnl lock.
4348 */
4349 lctl = *ctl;
4350 lctl.data = &val;
4351
4352 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4353
4354 if (write)
4355 ret = addrconf_disable_ipv6(ctl, valp, val);
4356 if (ret)
4357 *ppos = pos;
4358 return ret;
4359}
4360
4361static struct addrconf_sysctl_table
4362{
4363 struct ctl_table_header *sysctl_header;
4364 ctl_table addrconf_vars[DEVCONF_MAX+1];
4365} addrconf_sysctl __read_mostly = {
4366 .sysctl_header = NULL,
4367 .addrconf_vars = {
4368 {
4369 .procname = "forwarding",
4370 .data = &ipv6_devconf.forwarding,
4371 .maxlen = sizeof(int),
4372 .mode = 0644,
4373 .proc_handler = addrconf_sysctl_forward,
4374 },
4375 {
4376 .procname = "hop_limit",
4377 .data = &ipv6_devconf.hop_limit,
4378 .maxlen = sizeof(int),
4379 .mode = 0644,
4380 .proc_handler = proc_dointvec,
4381 },
4382 {
4383 .procname = "mtu",
4384 .data = &ipv6_devconf.mtu6,
4385 .maxlen = sizeof(int),
4386 .mode = 0644,
4387 .proc_handler = proc_dointvec,
4388 },
4389 {
4390 .procname = "accept_ra",
4391 .data = &ipv6_devconf.accept_ra,
4392 .maxlen = sizeof(int),
4393 .mode = 0644,
4394 .proc_handler = proc_dointvec,
4395 },
4396 {
4397 .procname = "accept_redirects",
4398 .data = &ipv6_devconf.accept_redirects,
4399 .maxlen = sizeof(int),
4400 .mode = 0644,
4401 .proc_handler = proc_dointvec,
4402 },
4403 {
4404 .procname = "autoconf",
4405 .data = &ipv6_devconf.autoconf,
4406 .maxlen = sizeof(int),
4407 .mode = 0644,
4408 .proc_handler = proc_dointvec,
4409 },
4410 {
4411 .procname = "dad_transmits",
4412 .data = &ipv6_devconf.dad_transmits,
4413 .maxlen = sizeof(int),
4414 .mode = 0644,
4415 .proc_handler = proc_dointvec,
4416 },
4417 {
4418 .procname = "router_solicitations",
4419 .data = &ipv6_devconf.rtr_solicits,
4420 .maxlen = sizeof(int),
4421 .mode = 0644,
4422 .proc_handler = proc_dointvec,
4423 },
4424 {
4425 .procname = "router_solicitation_interval",
4426 .data = &ipv6_devconf.rtr_solicit_interval,
4427 .maxlen = sizeof(int),
4428 .mode = 0644,
4429 .proc_handler = proc_dointvec_jiffies,
4430 },
4431 {
4432 .procname = "router_solicitation_delay",
4433 .data = &ipv6_devconf.rtr_solicit_delay,
4434 .maxlen = sizeof(int),
4435 .mode = 0644,
4436 .proc_handler = proc_dointvec_jiffies,
4437 },
4438 {
4439 .procname = "force_mld_version",
4440 .data = &ipv6_devconf.force_mld_version,
4441 .maxlen = sizeof(int),
4442 .mode = 0644,
4443 .proc_handler = proc_dointvec,
4444 },
4445#ifdef CONFIG_IPV6_PRIVACY
4446 {
4447 .procname = "use_tempaddr",
4448 .data = &ipv6_devconf.use_tempaddr,
4449 .maxlen = sizeof(int),
4450 .mode = 0644,
4451 .proc_handler = proc_dointvec,
4452 },
4453 {
4454 .procname = "temp_valid_lft",
4455 .data = &ipv6_devconf.temp_valid_lft,
4456 .maxlen = sizeof(int),
4457 .mode = 0644,
4458 .proc_handler = proc_dointvec,
4459 },
4460 {
4461 .procname = "temp_prefered_lft",
4462 .data = &ipv6_devconf.temp_prefered_lft,
4463 .maxlen = sizeof(int),
4464 .mode = 0644,
4465 .proc_handler = proc_dointvec,
4466 },
4467 {
4468 .procname = "regen_max_retry",
4469 .data = &ipv6_devconf.regen_max_retry,
4470 .maxlen = sizeof(int),
4471 .mode = 0644,
4472 .proc_handler = proc_dointvec,
4473 },
4474 {
4475 .procname = "max_desync_factor",
4476 .data = &ipv6_devconf.max_desync_factor,
4477 .maxlen = sizeof(int),
4478 .mode = 0644,
4479 .proc_handler = proc_dointvec,
4480 },
4481#endif
4482 {
4483 .procname = "max_addresses",
4484 .data = &ipv6_devconf.max_addresses,
4485 .maxlen = sizeof(int),
4486 .mode = 0644,
4487 .proc_handler = proc_dointvec,
4488 },
4489 {
4490 .procname = "accept_ra_defrtr",
4491 .data = &ipv6_devconf.accept_ra_defrtr,
4492 .maxlen = sizeof(int),
4493 .mode = 0644,
4494 .proc_handler = proc_dointvec,
4495 },
4496 {
4497 .procname = "accept_ra_pinfo",
4498 .data = &ipv6_devconf.accept_ra_pinfo,
4499 .maxlen = sizeof(int),
4500 .mode = 0644,
4501 .proc_handler = proc_dointvec,
4502 },
4503#ifdef CONFIG_IPV6_ROUTER_PREF
4504 {
4505 .procname = "accept_ra_rtr_pref",
4506 .data = &ipv6_devconf.accept_ra_rtr_pref,
4507 .maxlen = sizeof(int),
4508 .mode = 0644,
4509 .proc_handler = proc_dointvec,
4510 },
4511 {
4512 .procname = "router_probe_interval",
4513 .data = &ipv6_devconf.rtr_probe_interval,
4514 .maxlen = sizeof(int),
4515 .mode = 0644,
4516 .proc_handler = proc_dointvec_jiffies,
4517 },
4518#ifdef CONFIG_IPV6_ROUTE_INFO
4519 {
4520 .procname = "accept_ra_rt_info_max_plen",
4521 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4522 .maxlen = sizeof(int),
4523 .mode = 0644,
4524 .proc_handler = proc_dointvec,
4525 },
4526#endif
4527#endif
4528 {
4529 .procname = "proxy_ndp",
4530 .data = &ipv6_devconf.proxy_ndp,
4531 .maxlen = sizeof(int),
4532 .mode = 0644,
4533 .proc_handler = proc_dointvec,
4534 },
4535 {
4536 .procname = "accept_source_route",
4537 .data = &ipv6_devconf.accept_source_route,
4538 .maxlen = sizeof(int),
4539 .mode = 0644,
4540 .proc_handler = proc_dointvec,
4541 },
4542#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4543 {
4544 .procname = "optimistic_dad",
4545 .data = &ipv6_devconf.optimistic_dad,
4546 .maxlen = sizeof(int),
4547 .mode = 0644,
4548 .proc_handler = proc_dointvec,
4549
4550 },
4551#endif
4552#ifdef CONFIG_IPV6_MROUTE
4553 {
4554 .procname = "mc_forwarding",
4555 .data = &ipv6_devconf.mc_forwarding,
4556 .maxlen = sizeof(int),
4557 .mode = 0444,
4558 .proc_handler = proc_dointvec,
4559 },
4560#endif
4561 {
4562 .procname = "disable_ipv6",
4563 .data = &ipv6_devconf.disable_ipv6,
4564 .maxlen = sizeof(int),
4565 .mode = 0644,
4566 .proc_handler = addrconf_sysctl_disable,
4567 },
4568 {
4569 .procname = "accept_dad",
4570 .data = &ipv6_devconf.accept_dad,
4571 .maxlen = sizeof(int),
4572 .mode = 0644,
4573 .proc_handler = proc_dointvec,
4574 },
4575 {
4576 .procname = "force_tllao",
4577 .data = &ipv6_devconf.force_tllao,
4578 .maxlen = sizeof(int),
4579 .mode = 0644,
4580 .proc_handler = proc_dointvec
4581 },
4582 {
4583 /* sentinel */
4584 }
4585 },
4586};
4587
4588static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4589 struct inet6_dev *idev, struct ipv6_devconf *p)
4590{
4591 int i;
4592 struct addrconf_sysctl_table *t;
4593 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4594
4595 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4596 if (t == NULL)
4597 goto out;
4598
4599 for (i = 0; t->addrconf_vars[i].data; i++) {
4600 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4601 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4602 t->addrconf_vars[i].extra2 = net;
4603 }
4604
4605 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4606
4607 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4608 if (t->sysctl_header == NULL)
4609 goto free;
4610
4611 p->sysctl = t;
4612 return 0;
4613
4614free:
4615 kfree(t);
4616out:
4617 return -ENOBUFS;
4618}
4619
4620static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4621{
4622 struct addrconf_sysctl_table *t;
4623
4624 if (p->sysctl == NULL)
4625 return;
4626
4627 t = p->sysctl;
4628 p->sysctl = NULL;
4629 unregister_net_sysctl_table(t->sysctl_header);
4630 kfree(t);
4631}
4632
4633static void addrconf_sysctl_register(struct inet6_dev *idev)
4634{
4635 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4636 &ndisc_ifinfo_sysctl_change);
4637 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4638 idev, &idev->cnf);
4639}
4640
4641static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4642{
4643 __addrconf_sysctl_unregister(&idev->cnf);
4644 neigh_sysctl_unregister(idev->nd_parms);
4645}
4646
4647
4648#endif
4649
4650static int __net_init addrconf_init_net(struct net *net)
4651{
4652 int err;
4653 struct ipv6_devconf *all, *dflt;
4654
4655 err = -ENOMEM;
4656 all = &ipv6_devconf;
4657 dflt = &ipv6_devconf_dflt;
4658
4659 if (!net_eq(net, &init_net)) {
4660 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4661 if (all == NULL)
4662 goto err_alloc_all;
4663
4664 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4665 if (dflt == NULL)
4666 goto err_alloc_dflt;
4667 } else {
4668 /* these will be inherited by all namespaces */
4669 dflt->autoconf = ipv6_defaults.autoconf;
4670 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4671 }
4672
4673 net->ipv6.devconf_all = all;
4674 net->ipv6.devconf_dflt = dflt;
4675
4676#ifdef CONFIG_SYSCTL
4677 err = __addrconf_sysctl_register(net, "all", NULL, all);
4678 if (err < 0)
4679 goto err_reg_all;
4680
4681 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4682 if (err < 0)
4683 goto err_reg_dflt;
4684#endif
4685 return 0;
4686
4687#ifdef CONFIG_SYSCTL
4688err_reg_dflt:
4689 __addrconf_sysctl_unregister(all);
4690err_reg_all:
4691 kfree(dflt);
4692#endif
4693err_alloc_dflt:
4694 kfree(all);
4695err_alloc_all:
4696 return err;
4697}
4698
4699static void __net_exit addrconf_exit_net(struct net *net)
4700{
4701#ifdef CONFIG_SYSCTL
4702 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4703 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4704#endif
4705 if (!net_eq(net, &init_net)) {
4706 kfree(net->ipv6.devconf_dflt);
4707 kfree(net->ipv6.devconf_all);
4708 }
4709}
4710
4711static struct pernet_operations addrconf_ops = {
4712 .init = addrconf_init_net,
4713 .exit = addrconf_exit_net,
4714};
4715
4716/*
4717 * Device notifier
4718 */
4719
4720int register_inet6addr_notifier(struct notifier_block *nb)
4721{
4722 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4723}
4724EXPORT_SYMBOL(register_inet6addr_notifier);
4725
4726int unregister_inet6addr_notifier(struct notifier_block *nb)
4727{
4728 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4729}
4730EXPORT_SYMBOL(unregister_inet6addr_notifier);
4731
4732static struct rtnl_af_ops inet6_ops = {
4733 .family = AF_INET6,
4734 .fill_link_af = inet6_fill_link_af,
4735 .get_link_af_size = inet6_get_link_af_size,
4736};
4737
4738/*
4739 * Init / cleanup code
4740 */
4741
4742int __init addrconf_init(void)
4743{
4744 int i, err;
4745
4746 err = ipv6_addr_label_init();
4747 if (err < 0) {
4748 pr_crit("%s: cannot initialize default policy table: %d\n",
4749 __func__, err);
4750 goto out;
4751 }
4752
4753 err = register_pernet_subsys(&addrconf_ops);
4754 if (err < 0)
4755 goto out_addrlabel;
4756
4757 /* The addrconf netdev notifier requires that loopback_dev
4758 * has it's ipv6 private information allocated and setup
4759 * before it can bring up and give link-local addresses
4760 * to other devices which are up.
4761 *
4762 * Unfortunately, loopback_dev is not necessarily the first
4763 * entry in the global dev_base list of net devices. In fact,
4764 * it is likely to be the very last entry on that list.
4765 * So this causes the notifier registry below to try and
4766 * give link-local addresses to all devices besides loopback_dev
4767 * first, then loopback_dev, which cases all the non-loopback_dev
4768 * devices to fail to get a link-local address.
4769 *
4770 * So, as a temporary fix, allocate the ipv6 structure for
4771 * loopback_dev first by hand.
4772 * Longer term, all of the dependencies ipv6 has upon the loopback
4773 * device and it being up should be removed.
4774 */
4775 rtnl_lock();
4776 if (!ipv6_add_dev(init_net.loopback_dev))
4777 err = -ENOMEM;
4778 rtnl_unlock();
4779 if (err)
4780 goto errlo;
4781
4782 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4783 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4784
4785 register_netdevice_notifier(&ipv6_dev_notf);
4786
4787 addrconf_verify(0);
4788
4789 err = rtnl_af_register(&inet6_ops);
4790 if (err < 0)
4791 goto errout_af;
4792
4793 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4794 NULL);
4795 if (err < 0)
4796 goto errout;
4797
4798 /* Only the first call to __rtnl_register can fail */
4799 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4800 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4801 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4802 inet6_dump_ifaddr, NULL);
4803 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4804 inet6_dump_ifmcaddr, NULL);
4805 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4806 inet6_dump_ifacaddr, NULL);
4807
4808 ipv6_addr_label_rtnl_register();
4809
4810 return 0;
4811errout:
4812 rtnl_af_unregister(&inet6_ops);
4813errout_af:
4814 unregister_netdevice_notifier(&ipv6_dev_notf);
4815errlo:
4816 unregister_pernet_subsys(&addrconf_ops);
4817out_addrlabel:
4818 ipv6_addr_label_cleanup();
4819out:
4820 return err;
4821}
4822
4823void addrconf_cleanup(void)
4824{
4825 struct net_device *dev;
4826 int i;
4827
4828 unregister_netdevice_notifier(&ipv6_dev_notf);
4829 unregister_pernet_subsys(&addrconf_ops);
4830 ipv6_addr_label_cleanup();
4831
4832 rtnl_lock();
4833
4834 __rtnl_af_unregister(&inet6_ops);
4835
4836 /* clean dev list */
4837 for_each_netdev(&init_net, dev) {
4838 if (__in6_dev_get(dev) == NULL)
4839 continue;
4840 addrconf_ifdown(dev, 1);
4841 }
4842 addrconf_ifdown(init_net.loopback_dev, 2);
4843
4844 /*
4845 * Check hash table.
4846 */
4847 spin_lock_bh(&addrconf_hash_lock);
4848 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4849 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4850 spin_unlock_bh(&addrconf_hash_lock);
4851
4852 del_timer(&addr_chk_timer);
4853 rtnl_unlock();
4854}