Loading...
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}
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#include <linux/errno.h>
42#include <linux/types.h>
43#include <linux/kernel.h>
44#include <linux/socket.h>
45#include <linux/sockios.h>
46#include <linux/net.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
49#include <linux/if_addr.h>
50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
56#include <linux/slab.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
60#include <linux/capability.h>
61#include <linux/delay.h>
62#include <linux/notifier.h>
63#include <linux/string.h>
64
65#include <net/net_namespace.h>
66#include <net/sock.h>
67#include <net/snmp.h>
68
69#include <net/ipv6.h>
70#include <net/protocol.h>
71#include <net/ndisc.h>
72#include <net/ip6_route.h>
73#include <net/addrconf.h>
74#include <net/tcp.h>
75#include <net/ip.h>
76#include <net/netlink.h>
77#include <net/pkt_sched.h>
78#include <linux/if_tunnel.h>
79#include <linux/rtnetlink.h>
80
81#ifdef CONFIG_IPV6_PRIVACY
82#include <linux/random.h>
83#endif
84
85#include <linux/uaccess.h>
86#include <asm/unaligned.h>
87
88#include <linux/proc_fs.h>
89#include <linux/seq_file.h>
90
91/* Set to 3 to get tracing... */
92#define ACONF_DEBUG 2
93
94#if ACONF_DEBUG >= 3
95#define ADBG(x) printk x
96#else
97#define ADBG(x)
98#endif
99
100#define INFINITY_LIFE_TIME 0xFFFFFFFF
101
102static inline u32 cstamp_delta(unsigned long cstamp)
103{
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105}
106
107#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
108#define ADDRCONF_TIMER_FUZZ (HZ / 4)
109#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
110
111#ifdef CONFIG_SYSCTL
112static void addrconf_sysctl_register(struct inet6_dev *idev);
113static void addrconf_sysctl_unregister(struct inet6_dev *idev);
114#else
115static inline void addrconf_sysctl_register(struct inet6_dev *idev)
116{
117}
118
119static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
120{
121}
122#endif
123
124#ifdef CONFIG_IPV6_PRIVACY
125static int __ipv6_regen_rndid(struct inet6_dev *idev);
126static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
127static void ipv6_regen_rndid(unsigned long data);
128#endif
129
130static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
131static int ipv6_count_addresses(struct inet6_dev *idev);
132
133/*
134 * Configured unicast address hash table
135 */
136static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
137static DEFINE_SPINLOCK(addrconf_hash_lock);
138
139static void addrconf_verify(unsigned long);
140
141static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
142static DEFINE_SPINLOCK(addrconf_verify_lock);
143
144static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
145static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
146
147static void addrconf_type_change(struct net_device *dev,
148 unsigned long event);
149static int addrconf_ifdown(struct net_device *dev, int how);
150
151static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
152static void addrconf_dad_timer(unsigned long data);
153static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
154static void addrconf_dad_run(struct inet6_dev *idev);
155static void addrconf_rs_timer(unsigned long data);
156static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
157static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
158
159static void inet6_prefix_notify(int event, struct inet6_dev *idev,
160 struct prefix_info *pinfo);
161static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
162 struct net_device *dev);
163
164static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
165
166static struct ipv6_devconf ipv6_devconf __read_mostly = {
167 .forwarding = 0,
168 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
169 .mtu6 = IPV6_MIN_MTU,
170 .accept_ra = 1,
171 .accept_redirects = 1,
172 .autoconf = 1,
173 .force_mld_version = 0,
174 .dad_transmits = 1,
175 .rtr_solicits = MAX_RTR_SOLICITATIONS,
176 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
177 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
178#ifdef CONFIG_IPV6_PRIVACY
179 .use_tempaddr = 0,
180 .temp_valid_lft = TEMP_VALID_LIFETIME,
181 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
182 .regen_max_retry = REGEN_MAX_RETRY,
183 .max_desync_factor = MAX_DESYNC_FACTOR,
184#endif
185 .max_addresses = IPV6_MAX_ADDRESSES,
186 .accept_ra_defrtr = 1,
187 .accept_ra_pinfo = 1,
188#ifdef CONFIG_IPV6_ROUTER_PREF
189 .accept_ra_rtr_pref = 1,
190 .rtr_probe_interval = 60 * HZ,
191#ifdef CONFIG_IPV6_ROUTE_INFO
192 .accept_ra_rt_info_max_plen = 0,
193#endif
194#endif
195 .proxy_ndp = 0,
196 .accept_source_route = 0, /* we do not accept RH0 by default. */
197 .disable_ipv6 = 0,
198 .accept_dad = 1,
199};
200
201static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
202 .forwarding = 0,
203 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
204 .mtu6 = IPV6_MIN_MTU,
205 .accept_ra = 1,
206 .accept_redirects = 1,
207 .autoconf = 1,
208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
212#ifdef CONFIG_IPV6_PRIVACY
213 .use_tempaddr = 0,
214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
218#endif
219 .max_addresses = IPV6_MAX_ADDRESSES,
220 .accept_ra_defrtr = 1,
221 .accept_ra_pinfo = 1,
222#ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
224 .rtr_probe_interval = 60 * HZ,
225#ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227#endif
228#endif
229 .proxy_ndp = 0,
230 .accept_source_route = 0, /* we do not accept RH0 by default. */
231 .disable_ipv6 = 0,
232 .accept_dad = 1,
233};
234
235/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
236const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
237const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
238const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
239const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
240
241/* Check if a valid qdisc is available */
242static inline bool addrconf_qdisc_ok(const struct net_device *dev)
243{
244 return !qdisc_tx_is_noop(dev);
245}
246
247/* Check if a route is valid prefix route */
248static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
249{
250 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
251}
252
253static void addrconf_del_timer(struct inet6_ifaddr *ifp)
254{
255 if (del_timer(&ifp->timer))
256 __in6_ifa_put(ifp);
257}
258
259enum addrconf_timer_t {
260 AC_NONE,
261 AC_DAD,
262 AC_RS,
263};
264
265static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
266 enum addrconf_timer_t what,
267 unsigned long when)
268{
269 if (!del_timer(&ifp->timer))
270 in6_ifa_hold(ifp);
271
272 switch (what) {
273 case AC_DAD:
274 ifp->timer.function = addrconf_dad_timer;
275 break;
276 case AC_RS:
277 ifp->timer.function = addrconf_rs_timer;
278 break;
279 default:
280 break;
281 }
282 ifp->timer.expires = jiffies + when;
283 add_timer(&ifp->timer);
284}
285
286static int snmp6_alloc_dev(struct inet6_dev *idev)
287{
288 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
289 sizeof(struct ipstats_mib),
290 __alignof__(struct ipstats_mib)) < 0)
291 goto err_ip;
292 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
293 GFP_KERNEL);
294 if (!idev->stats.icmpv6dev)
295 goto err_icmp;
296 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6msgdev)
299 goto err_icmpmsg;
300
301 return 0;
302
303err_icmpmsg:
304 kfree(idev->stats.icmpv6dev);
305err_icmp:
306 snmp_mib_free((void __percpu **)idev->stats.ipv6);
307err_ip:
308 return -ENOMEM;
309}
310
311static void snmp6_free_dev(struct inet6_dev *idev)
312{
313 kfree(idev->stats.icmpv6msgdev);
314 kfree(idev->stats.icmpv6dev);
315 snmp_mib_free((void __percpu **)idev->stats.ipv6);
316}
317
318/* Nobody refers to this device, we may destroy it. */
319
320void in6_dev_finish_destroy(struct inet6_dev *idev)
321{
322 struct net_device *dev = idev->dev;
323
324 WARN_ON(!list_empty(&idev->addr_list));
325 WARN_ON(idev->mc_list != NULL);
326
327#ifdef NET_REFCNT_DEBUG
328 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
329#endif
330 dev_put(dev);
331 if (!idev->dead) {
332 pr_warning("Freeing alive inet6 device %p\n", idev);
333 return;
334 }
335 snmp6_free_dev(idev);
336 kfree_rcu(idev, rcu);
337}
338
339EXPORT_SYMBOL(in6_dev_finish_destroy);
340
341static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
342{
343 struct inet6_dev *ndev;
344
345 ASSERT_RTNL();
346
347 if (dev->mtu < IPV6_MIN_MTU)
348 return NULL;
349
350 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
351
352 if (ndev == NULL)
353 return NULL;
354
355 rwlock_init(&ndev->lock);
356 ndev->dev = dev;
357 INIT_LIST_HEAD(&ndev->addr_list);
358
359 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
360 ndev->cnf.mtu6 = dev->mtu;
361 ndev->cnf.sysctl = NULL;
362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
363 if (ndev->nd_parms == NULL) {
364 kfree(ndev);
365 return NULL;
366 }
367 if (ndev->cnf.forwarding)
368 dev_disable_lro(dev);
369 /* We refer to the device */
370 dev_hold(dev);
371
372 if (snmp6_alloc_dev(ndev) < 0) {
373 ADBG((KERN_WARNING
374 "%s(): cannot allocate memory for statistics; dev=%s.\n",
375 __func__, dev->name));
376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
377 dev_put(dev);
378 kfree(ndev);
379 return NULL;
380 }
381
382 if (snmp6_register_dev(ndev) < 0) {
383 ADBG((KERN_WARNING
384 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
385 __func__, dev->name));
386 neigh_parms_release(&nd_tbl, ndev->nd_parms);
387 ndev->dead = 1;
388 in6_dev_finish_destroy(ndev);
389 return NULL;
390 }
391
392 /* One reference from device. We must do this before
393 * we invoke __ipv6_regen_rndid().
394 */
395 in6_dev_hold(ndev);
396
397 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
398 ndev->cnf.accept_dad = -1;
399
400#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
401 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
402 printk(KERN_INFO
403 "%s: Disabled Multicast RS\n",
404 dev->name);
405 ndev->cnf.rtr_solicits = 0;
406 }
407#endif
408
409#ifdef CONFIG_IPV6_PRIVACY
410 INIT_LIST_HEAD(&ndev->tempaddr_list);
411 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
412 if ((dev->flags&IFF_LOOPBACK) ||
413 dev->type == ARPHRD_TUNNEL ||
414 dev->type == ARPHRD_TUNNEL6 ||
415 dev->type == ARPHRD_SIT ||
416 dev->type == ARPHRD_NONE) {
417 ndev->cnf.use_tempaddr = -1;
418 } else {
419 in6_dev_hold(ndev);
420 ipv6_regen_rndid((unsigned long) ndev);
421 }
422#endif
423
424 if (netif_running(dev) && addrconf_qdisc_ok(dev))
425 ndev->if_flags |= IF_READY;
426
427 ipv6_mc_init_dev(ndev);
428 ndev->tstamp = jiffies;
429 addrconf_sysctl_register(ndev);
430 /* protected by rtnl_lock */
431 rcu_assign_pointer(dev->ip6_ptr, ndev);
432
433 /* Join all-node multicast group */
434 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
435
436 return ndev;
437}
438
439static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
440{
441 struct inet6_dev *idev;
442
443 ASSERT_RTNL();
444
445 idev = __in6_dev_get(dev);
446 if (!idev) {
447 idev = ipv6_add_dev(dev);
448 if (!idev)
449 return NULL;
450 }
451
452 if (dev->flags&IFF_UP)
453 ipv6_mc_up(idev);
454 return idev;
455}
456
457#ifdef CONFIG_SYSCTL
458static void dev_forward_change(struct inet6_dev *idev)
459{
460 struct net_device *dev;
461 struct inet6_ifaddr *ifa;
462
463 if (!idev)
464 return;
465 dev = idev->dev;
466 if (idev->cnf.forwarding)
467 dev_disable_lro(dev);
468 if (dev && (dev->flags & IFF_MULTICAST)) {
469 if (idev->cnf.forwarding)
470 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
471 else
472 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
473 }
474
475 list_for_each_entry(ifa, &idev->addr_list, if_list) {
476 if (ifa->flags&IFA_F_TENTATIVE)
477 continue;
478 if (idev->cnf.forwarding)
479 addrconf_join_anycast(ifa);
480 else
481 addrconf_leave_anycast(ifa);
482 }
483}
484
485
486static void addrconf_forward_change(struct net *net, __s32 newf)
487{
488 struct net_device *dev;
489 struct inet6_dev *idev;
490
491 rcu_read_lock();
492 for_each_netdev_rcu(net, dev) {
493 idev = __in6_dev_get(dev);
494 if (idev) {
495 int changed = (!idev->cnf.forwarding) ^ (!newf);
496 idev->cnf.forwarding = newf;
497 if (changed)
498 dev_forward_change(idev);
499 }
500 }
501 rcu_read_unlock();
502}
503
504static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
505{
506 struct net *net;
507
508 net = (struct net *)table->extra2;
509 if (p == &net->ipv6.devconf_dflt->forwarding)
510 return 0;
511
512 if (!rtnl_trylock()) {
513 /* Restore the original values before restarting */
514 *p = old;
515 return restart_syscall();
516 }
517
518 if (p == &net->ipv6.devconf_all->forwarding) {
519 __s32 newf = net->ipv6.devconf_all->forwarding;
520 net->ipv6.devconf_dflt->forwarding = newf;
521 addrconf_forward_change(net, newf);
522 } else if ((!*p) ^ (!old))
523 dev_forward_change((struct inet6_dev *)table->extra1);
524 rtnl_unlock();
525
526 if (*p)
527 rt6_purge_dflt_routers(net);
528 return 1;
529}
530#endif
531
532/* Nobody refers to this ifaddr, destroy it */
533void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
534{
535 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
536
537#ifdef NET_REFCNT_DEBUG
538 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
539#endif
540
541 in6_dev_put(ifp->idev);
542
543 if (del_timer(&ifp->timer))
544 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
545
546 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
547 pr_warning("Freeing alive inet6 address %p\n", ifp);
548 return;
549 }
550 dst_release(&ifp->rt->dst);
551
552 kfree_rcu(ifp, rcu);
553}
554
555static void
556ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
557{
558 struct list_head *p;
559 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
560
561 /*
562 * Each device address list is sorted in order of scope -
563 * global before linklocal.
564 */
565 list_for_each(p, &idev->addr_list) {
566 struct inet6_ifaddr *ifa
567 = list_entry(p, struct inet6_ifaddr, if_list);
568 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
569 break;
570 }
571
572 list_add_tail(&ifp->if_list, p);
573}
574
575static u32 ipv6_addr_hash(const struct in6_addr *addr)
576{
577 /*
578 * We perform the hash function over the last 64 bits of the address
579 * This will include the IEEE address token on links that support it.
580 */
581 return jhash_2words((__force u32)addr->s6_addr32[2],
582 (__force u32)addr->s6_addr32[3], 0)
583 & (IN6_ADDR_HSIZE - 1);
584}
585
586/* On success it returns ifp with increased reference count */
587
588static struct inet6_ifaddr *
589ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
590 int scope, u32 flags)
591{
592 struct inet6_ifaddr *ifa = NULL;
593 struct rt6_info *rt;
594 unsigned int hash;
595 int err = 0;
596 int addr_type = ipv6_addr_type(addr);
597
598 if (addr_type == IPV6_ADDR_ANY ||
599 addr_type & IPV6_ADDR_MULTICAST ||
600 (!(idev->dev->flags & IFF_LOOPBACK) &&
601 addr_type & IPV6_ADDR_LOOPBACK))
602 return ERR_PTR(-EADDRNOTAVAIL);
603
604 rcu_read_lock_bh();
605 if (idev->dead) {
606 err = -ENODEV; /*XXX*/
607 goto out2;
608 }
609
610 if (idev->cnf.disable_ipv6) {
611 err = -EACCES;
612 goto out2;
613 }
614
615 spin_lock(&addrconf_hash_lock);
616
617 /* Ignore adding duplicate addresses on an interface */
618 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
619 ADBG(("ipv6_add_addr: already assigned\n"));
620 err = -EEXIST;
621 goto out;
622 }
623
624 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
625
626 if (ifa == NULL) {
627 ADBG(("ipv6_add_addr: malloc failed\n"));
628 err = -ENOBUFS;
629 goto out;
630 }
631
632 rt = addrconf_dst_alloc(idev, addr, 0);
633 if (IS_ERR(rt)) {
634 err = PTR_ERR(rt);
635 goto out;
636 }
637
638 ipv6_addr_copy(&ifa->addr, addr);
639
640 spin_lock_init(&ifa->lock);
641 spin_lock_init(&ifa->state_lock);
642 init_timer(&ifa->timer);
643 INIT_HLIST_NODE(&ifa->addr_lst);
644 ifa->timer.data = (unsigned long) ifa;
645 ifa->scope = scope;
646 ifa->prefix_len = pfxlen;
647 ifa->flags = flags | IFA_F_TENTATIVE;
648 ifa->cstamp = ifa->tstamp = jiffies;
649
650 ifa->rt = rt;
651
652 /*
653 * part one of RFC 4429, section 3.3
654 * We should not configure an address as
655 * optimistic if we do not yet know the link
656 * layer address of our nexhop router
657 */
658
659 if (dst_get_neighbour_raw(&rt->dst) == NULL)
660 ifa->flags &= ~IFA_F_OPTIMISTIC;
661
662 ifa->idev = idev;
663 in6_dev_hold(idev);
664 /* For caller */
665 in6_ifa_hold(ifa);
666
667 /* Add to big hash table */
668 hash = ipv6_addr_hash(addr);
669
670 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
671 spin_unlock(&addrconf_hash_lock);
672
673 write_lock(&idev->lock);
674 /* Add to inet6_dev unicast addr list. */
675 ipv6_link_dev_addr(idev, ifa);
676
677#ifdef CONFIG_IPV6_PRIVACY
678 if (ifa->flags&IFA_F_TEMPORARY) {
679 list_add(&ifa->tmp_list, &idev->tempaddr_list);
680 in6_ifa_hold(ifa);
681 }
682#endif
683
684 in6_ifa_hold(ifa);
685 write_unlock(&idev->lock);
686out2:
687 rcu_read_unlock_bh();
688
689 if (likely(err == 0))
690 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
691 else {
692 kfree(ifa);
693 ifa = ERR_PTR(err);
694 }
695
696 return ifa;
697out:
698 spin_unlock(&addrconf_hash_lock);
699 goto out2;
700}
701
702/* This function wants to get referenced ifp and releases it before return */
703
704static void ipv6_del_addr(struct inet6_ifaddr *ifp)
705{
706 struct inet6_ifaddr *ifa, *ifn;
707 struct inet6_dev *idev = ifp->idev;
708 int state;
709 int deleted = 0, onlink = 0;
710 unsigned long expires = jiffies;
711
712 spin_lock_bh(&ifp->state_lock);
713 state = ifp->state;
714 ifp->state = INET6_IFADDR_STATE_DEAD;
715 spin_unlock_bh(&ifp->state_lock);
716
717 if (state == INET6_IFADDR_STATE_DEAD)
718 goto out;
719
720 spin_lock_bh(&addrconf_hash_lock);
721 hlist_del_init_rcu(&ifp->addr_lst);
722 spin_unlock_bh(&addrconf_hash_lock);
723
724 write_lock_bh(&idev->lock);
725#ifdef CONFIG_IPV6_PRIVACY
726 if (ifp->flags&IFA_F_TEMPORARY) {
727 list_del(&ifp->tmp_list);
728 if (ifp->ifpub) {
729 in6_ifa_put(ifp->ifpub);
730 ifp->ifpub = NULL;
731 }
732 __in6_ifa_put(ifp);
733 }
734#endif
735
736 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
737 if (ifa == ifp) {
738 list_del_init(&ifp->if_list);
739 __in6_ifa_put(ifp);
740
741 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
742 break;
743 deleted = 1;
744 continue;
745 } else if (ifp->flags & IFA_F_PERMANENT) {
746 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
747 ifp->prefix_len)) {
748 if (ifa->flags & IFA_F_PERMANENT) {
749 onlink = 1;
750 if (deleted)
751 break;
752 } else {
753 unsigned long lifetime;
754
755 if (!onlink)
756 onlink = -1;
757
758 spin_lock(&ifa->lock);
759
760 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
761 /*
762 * Note: Because this address is
763 * not permanent, lifetime <
764 * LONG_MAX / HZ here.
765 */
766 if (time_before(expires,
767 ifa->tstamp + lifetime * HZ))
768 expires = ifa->tstamp + lifetime * HZ;
769 spin_unlock(&ifa->lock);
770 }
771 }
772 }
773 }
774 write_unlock_bh(&idev->lock);
775
776 addrconf_del_timer(ifp);
777
778 ipv6_ifa_notify(RTM_DELADDR, ifp);
779
780 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
781
782 /*
783 * Purge or update corresponding prefix
784 *
785 * 1) we don't purge prefix here if address was not permanent.
786 * prefix is managed by its own lifetime.
787 * 2) if there're no addresses, delete prefix.
788 * 3) if there're still other permanent address(es),
789 * corresponding prefix is still permanent.
790 * 4) otherwise, update prefix lifetime to the
791 * longest valid lifetime among the corresponding
792 * addresses on the device.
793 * Note: subsequent RA will update lifetime.
794 *
795 * --yoshfuji
796 */
797 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
798 struct in6_addr prefix;
799 struct rt6_info *rt;
800 struct net *net = dev_net(ifp->idev->dev);
801 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
802 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
803
804 if (rt && addrconf_is_prefix_route(rt)) {
805 if (onlink == 0) {
806 ip6_del_rt(rt);
807 rt = NULL;
808 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
809 rt->rt6i_expires = expires;
810 rt->rt6i_flags |= RTF_EXPIRES;
811 }
812 }
813 dst_release(&rt->dst);
814 }
815
816 /* clean up prefsrc entries */
817 rt6_remove_prefsrc(ifp);
818out:
819 in6_ifa_put(ifp);
820}
821
822#ifdef CONFIG_IPV6_PRIVACY
823static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
824{
825 struct inet6_dev *idev = ifp->idev;
826 struct in6_addr addr, *tmpaddr;
827 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp, age;
828 unsigned long regen_advance;
829 int tmp_plen;
830 int ret = 0;
831 int max_addresses;
832 u32 addr_flags;
833
834 write_lock(&idev->lock);
835 if (ift) {
836 spin_lock_bh(&ift->lock);
837 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
838 spin_unlock_bh(&ift->lock);
839 tmpaddr = &addr;
840 } else {
841 tmpaddr = NULL;
842 }
843retry:
844 in6_dev_hold(idev);
845 if (idev->cnf.use_tempaddr <= 0) {
846 write_unlock(&idev->lock);
847 printk(KERN_INFO
848 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
849 in6_dev_put(idev);
850 ret = -1;
851 goto out;
852 }
853 spin_lock_bh(&ifp->lock);
854 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
855 idev->cnf.use_tempaddr = -1; /*XXX*/
856 spin_unlock_bh(&ifp->lock);
857 write_unlock(&idev->lock);
858 printk(KERN_WARNING
859 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
860 in6_dev_put(idev);
861 ret = -1;
862 goto out;
863 }
864 in6_ifa_hold(ifp);
865 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
866 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
867 spin_unlock_bh(&ifp->lock);
868 write_unlock(&idev->lock);
869 printk(KERN_WARNING
870 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
871 in6_ifa_put(ifp);
872 in6_dev_put(idev);
873 ret = -1;
874 goto out;
875 }
876 memcpy(&addr.s6_addr[8], idev->rndid, 8);
877 age = (jiffies - ifp->tstamp) / HZ;
878 tmp_valid_lft = min_t(__u32,
879 ifp->valid_lft,
880 idev->cnf.temp_valid_lft + age);
881 tmp_prefered_lft = min_t(__u32,
882 ifp->prefered_lft,
883 idev->cnf.temp_prefered_lft + age -
884 idev->cnf.max_desync_factor);
885 tmp_plen = ifp->prefix_len;
886 max_addresses = idev->cnf.max_addresses;
887 tmp_cstamp = ifp->cstamp;
888 tmp_tstamp = ifp->tstamp;
889 spin_unlock_bh(&ifp->lock);
890
891 regen_advance = idev->cnf.regen_max_retry *
892 idev->cnf.dad_transmits *
893 idev->nd_parms->retrans_time / HZ;
894 write_unlock(&idev->lock);
895
896 /* A temporary address is created only if this calculated Preferred
897 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
898 * an implementation must not create a temporary address with a zero
899 * Preferred Lifetime.
900 */
901 if (tmp_prefered_lft <= regen_advance) {
902 in6_ifa_put(ifp);
903 in6_dev_put(idev);
904 ret = -1;
905 goto out;
906 }
907
908 addr_flags = IFA_F_TEMPORARY;
909 /* set in addrconf_prefix_rcv() */
910 if (ifp->flags & IFA_F_OPTIMISTIC)
911 addr_flags |= IFA_F_OPTIMISTIC;
912
913 ift = !max_addresses ||
914 ipv6_count_addresses(idev) < max_addresses ?
915 ipv6_add_addr(idev, &addr, tmp_plen,
916 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
917 addr_flags) : NULL;
918 if (!ift || IS_ERR(ift)) {
919 in6_ifa_put(ifp);
920 in6_dev_put(idev);
921 printk(KERN_INFO
922 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
923 tmpaddr = &addr;
924 write_lock(&idev->lock);
925 goto retry;
926 }
927
928 spin_lock_bh(&ift->lock);
929 ift->ifpub = ifp;
930 ift->valid_lft = tmp_valid_lft;
931 ift->prefered_lft = tmp_prefered_lft;
932 ift->cstamp = tmp_cstamp;
933 ift->tstamp = tmp_tstamp;
934 spin_unlock_bh(&ift->lock);
935
936 addrconf_dad_start(ift, 0);
937 in6_ifa_put(ift);
938 in6_dev_put(idev);
939out:
940 return ret;
941}
942#endif
943
944/*
945 * Choose an appropriate source address (RFC3484)
946 */
947enum {
948 IPV6_SADDR_RULE_INIT = 0,
949 IPV6_SADDR_RULE_LOCAL,
950 IPV6_SADDR_RULE_SCOPE,
951 IPV6_SADDR_RULE_PREFERRED,
952#ifdef CONFIG_IPV6_MIP6
953 IPV6_SADDR_RULE_HOA,
954#endif
955 IPV6_SADDR_RULE_OIF,
956 IPV6_SADDR_RULE_LABEL,
957#ifdef CONFIG_IPV6_PRIVACY
958 IPV6_SADDR_RULE_PRIVACY,
959#endif
960 IPV6_SADDR_RULE_ORCHID,
961 IPV6_SADDR_RULE_PREFIX,
962 IPV6_SADDR_RULE_MAX
963};
964
965struct ipv6_saddr_score {
966 int rule;
967 int addr_type;
968 struct inet6_ifaddr *ifa;
969 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
970 int scopedist;
971 int matchlen;
972};
973
974struct ipv6_saddr_dst {
975 const struct in6_addr *addr;
976 int ifindex;
977 int scope;
978 int label;
979 unsigned int prefs;
980};
981
982static inline int ipv6_saddr_preferred(int type)
983{
984 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
985 return 1;
986 return 0;
987}
988
989static int ipv6_get_saddr_eval(struct net *net,
990 struct ipv6_saddr_score *score,
991 struct ipv6_saddr_dst *dst,
992 int i)
993{
994 int ret;
995
996 if (i <= score->rule) {
997 switch (i) {
998 case IPV6_SADDR_RULE_SCOPE:
999 ret = score->scopedist;
1000 break;
1001 case IPV6_SADDR_RULE_PREFIX:
1002 ret = score->matchlen;
1003 break;
1004 default:
1005 ret = !!test_bit(i, score->scorebits);
1006 }
1007 goto out;
1008 }
1009
1010 switch (i) {
1011 case IPV6_SADDR_RULE_INIT:
1012 /* Rule 0: remember if hiscore is not ready yet */
1013 ret = !!score->ifa;
1014 break;
1015 case IPV6_SADDR_RULE_LOCAL:
1016 /* Rule 1: Prefer same address */
1017 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1018 break;
1019 case IPV6_SADDR_RULE_SCOPE:
1020 /* Rule 2: Prefer appropriate scope
1021 *
1022 * ret
1023 * ^
1024 * -1 | d 15
1025 * ---+--+-+---> scope
1026 * |
1027 * | d is scope of the destination.
1028 * B-d | \
1029 * | \ <- smaller scope is better if
1030 * B-15 | \ if scope is enough for destinaion.
1031 * | ret = B - scope (-1 <= scope >= d <= 15).
1032 * d-C-1 | /
1033 * |/ <- greater is better
1034 * -C / if scope is not enough for destination.
1035 * /| ret = scope - C (-1 <= d < scope <= 15).
1036 *
1037 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1038 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1039 * Assume B = 0 and we get C > 29.
1040 */
1041 ret = __ipv6_addr_src_scope(score->addr_type);
1042 if (ret >= dst->scope)
1043 ret = -ret;
1044 else
1045 ret -= 128; /* 30 is enough */
1046 score->scopedist = ret;
1047 break;
1048 case IPV6_SADDR_RULE_PREFERRED:
1049 /* Rule 3: Avoid deprecated and optimistic addresses */
1050 ret = ipv6_saddr_preferred(score->addr_type) ||
1051 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1052 break;
1053#ifdef CONFIG_IPV6_MIP6
1054 case IPV6_SADDR_RULE_HOA:
1055 {
1056 /* Rule 4: Prefer home address */
1057 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1058 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1059 break;
1060 }
1061#endif
1062 case IPV6_SADDR_RULE_OIF:
1063 /* Rule 5: Prefer outgoing interface */
1064 ret = (!dst->ifindex ||
1065 dst->ifindex == score->ifa->idev->dev->ifindex);
1066 break;
1067 case IPV6_SADDR_RULE_LABEL:
1068 /* Rule 6: Prefer matching label */
1069 ret = ipv6_addr_label(net,
1070 &score->ifa->addr, score->addr_type,
1071 score->ifa->idev->dev->ifindex) == dst->label;
1072 break;
1073#ifdef CONFIG_IPV6_PRIVACY
1074 case IPV6_SADDR_RULE_PRIVACY:
1075 {
1076 /* Rule 7: Prefer public address
1077 * Note: prefer temporary address if use_tempaddr >= 2
1078 */
1079 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1080 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1081 score->ifa->idev->cnf.use_tempaddr >= 2;
1082 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1083 break;
1084 }
1085#endif
1086 case IPV6_SADDR_RULE_ORCHID:
1087 /* Rule 8-: Prefer ORCHID vs ORCHID or
1088 * non-ORCHID vs non-ORCHID
1089 */
1090 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1091 ipv6_addr_orchid(dst->addr));
1092 break;
1093 case IPV6_SADDR_RULE_PREFIX:
1094 /* Rule 8: Use longest matching prefix */
1095 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1096 dst->addr);
1097 break;
1098 default:
1099 ret = 0;
1100 }
1101
1102 if (ret)
1103 __set_bit(i, score->scorebits);
1104 score->rule = i;
1105out:
1106 return ret;
1107}
1108
1109int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1110 const struct in6_addr *daddr, unsigned int prefs,
1111 struct in6_addr *saddr)
1112{
1113 struct ipv6_saddr_score scores[2],
1114 *score = &scores[0], *hiscore = &scores[1];
1115 struct ipv6_saddr_dst dst;
1116 struct net_device *dev;
1117 int dst_type;
1118
1119 dst_type = __ipv6_addr_type(daddr);
1120 dst.addr = daddr;
1121 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1122 dst.scope = __ipv6_addr_src_scope(dst_type);
1123 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1124 dst.prefs = prefs;
1125
1126 hiscore->rule = -1;
1127 hiscore->ifa = NULL;
1128
1129 rcu_read_lock();
1130
1131 for_each_netdev_rcu(net, dev) {
1132 struct inet6_dev *idev;
1133
1134 /* Candidate Source Address (section 4)
1135 * - multicast and link-local destination address,
1136 * the set of candidate source address MUST only
1137 * include addresses assigned to interfaces
1138 * belonging to the same link as the outgoing
1139 * interface.
1140 * (- For site-local destination addresses, the
1141 * set of candidate source addresses MUST only
1142 * include addresses assigned to interfaces
1143 * belonging to the same site as the outgoing
1144 * interface.)
1145 */
1146 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1147 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1148 dst.ifindex && dev->ifindex != dst.ifindex)
1149 continue;
1150
1151 idev = __in6_dev_get(dev);
1152 if (!idev)
1153 continue;
1154
1155 read_lock_bh(&idev->lock);
1156 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1157 int i;
1158
1159 /*
1160 * - Tentative Address (RFC2462 section 5.4)
1161 * - A tentative address is not considered
1162 * "assigned to an interface" in the traditional
1163 * sense, unless it is also flagged as optimistic.
1164 * - Candidate Source Address (section 4)
1165 * - In any case, anycast addresses, multicast
1166 * addresses, and the unspecified address MUST
1167 * NOT be included in a candidate set.
1168 */
1169 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1170 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1171 continue;
1172
1173 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1174
1175 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1176 score->addr_type & IPV6_ADDR_MULTICAST)) {
1177 LIMIT_NETDEBUG(KERN_DEBUG
1178 "ADDRCONF: unspecified / multicast address "
1179 "assigned as unicast address on %s",
1180 dev->name);
1181 continue;
1182 }
1183
1184 score->rule = -1;
1185 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1186
1187 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1188 int minihiscore, miniscore;
1189
1190 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1191 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1192
1193 if (minihiscore > miniscore) {
1194 if (i == IPV6_SADDR_RULE_SCOPE &&
1195 score->scopedist > 0) {
1196 /*
1197 * special case:
1198 * each remaining entry
1199 * has too small (not enough)
1200 * scope, because ifa entries
1201 * are sorted by their scope
1202 * values.
1203 */
1204 goto try_nextdev;
1205 }
1206 break;
1207 } else if (minihiscore < miniscore) {
1208 if (hiscore->ifa)
1209 in6_ifa_put(hiscore->ifa);
1210
1211 in6_ifa_hold(score->ifa);
1212
1213 swap(hiscore, score);
1214
1215 /* restore our iterator */
1216 score->ifa = hiscore->ifa;
1217
1218 break;
1219 }
1220 }
1221 }
1222try_nextdev:
1223 read_unlock_bh(&idev->lock);
1224 }
1225 rcu_read_unlock();
1226
1227 if (!hiscore->ifa)
1228 return -EADDRNOTAVAIL;
1229
1230 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1231 in6_ifa_put(hiscore->ifa);
1232 return 0;
1233}
1234EXPORT_SYMBOL(ipv6_dev_get_saddr);
1235
1236int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1237 unsigned char banned_flags)
1238{
1239 struct inet6_dev *idev;
1240 int err = -EADDRNOTAVAIL;
1241
1242 rcu_read_lock();
1243 idev = __in6_dev_get(dev);
1244 if (idev) {
1245 struct inet6_ifaddr *ifp;
1246
1247 read_lock_bh(&idev->lock);
1248 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1249 if (ifp->scope == IFA_LINK &&
1250 !(ifp->flags & banned_flags)) {
1251 ipv6_addr_copy(addr, &ifp->addr);
1252 err = 0;
1253 break;
1254 }
1255 }
1256 read_unlock_bh(&idev->lock);
1257 }
1258 rcu_read_unlock();
1259 return err;
1260}
1261
1262static int ipv6_count_addresses(struct inet6_dev *idev)
1263{
1264 int cnt = 0;
1265 struct inet6_ifaddr *ifp;
1266
1267 read_lock_bh(&idev->lock);
1268 list_for_each_entry(ifp, &idev->addr_list, if_list)
1269 cnt++;
1270 read_unlock_bh(&idev->lock);
1271 return cnt;
1272}
1273
1274int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1275 struct net_device *dev, int strict)
1276{
1277 struct inet6_ifaddr *ifp;
1278 struct hlist_node *node;
1279 unsigned int hash = ipv6_addr_hash(addr);
1280
1281 rcu_read_lock_bh();
1282 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1283 if (!net_eq(dev_net(ifp->idev->dev), net))
1284 continue;
1285 if (ipv6_addr_equal(&ifp->addr, addr) &&
1286 !(ifp->flags&IFA_F_TENTATIVE) &&
1287 (dev == NULL || ifp->idev->dev == dev ||
1288 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1289 rcu_read_unlock_bh();
1290 return 1;
1291 }
1292 }
1293
1294 rcu_read_unlock_bh();
1295 return 0;
1296}
1297EXPORT_SYMBOL(ipv6_chk_addr);
1298
1299static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1300 struct net_device *dev)
1301{
1302 unsigned int hash = ipv6_addr_hash(addr);
1303 struct inet6_ifaddr *ifp;
1304 struct hlist_node *node;
1305
1306 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1307 if (!net_eq(dev_net(ifp->idev->dev), net))
1308 continue;
1309 if (ipv6_addr_equal(&ifp->addr, addr)) {
1310 if (dev == NULL || ifp->idev->dev == dev)
1311 return true;
1312 }
1313 }
1314 return false;
1315}
1316
1317int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1318{
1319 struct inet6_dev *idev;
1320 struct inet6_ifaddr *ifa;
1321 int onlink;
1322
1323 onlink = 0;
1324 rcu_read_lock();
1325 idev = __in6_dev_get(dev);
1326 if (idev) {
1327 read_lock_bh(&idev->lock);
1328 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1329 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1330 ifa->prefix_len);
1331 if (onlink)
1332 break;
1333 }
1334 read_unlock_bh(&idev->lock);
1335 }
1336 rcu_read_unlock();
1337 return onlink;
1338}
1339
1340EXPORT_SYMBOL(ipv6_chk_prefix);
1341
1342struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1343 struct net_device *dev, int strict)
1344{
1345 struct inet6_ifaddr *ifp, *result = NULL;
1346 unsigned int hash = ipv6_addr_hash(addr);
1347 struct hlist_node *node;
1348
1349 rcu_read_lock_bh();
1350 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1351 if (!net_eq(dev_net(ifp->idev->dev), net))
1352 continue;
1353 if (ipv6_addr_equal(&ifp->addr, addr)) {
1354 if (dev == NULL || ifp->idev->dev == dev ||
1355 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1356 result = ifp;
1357 in6_ifa_hold(ifp);
1358 break;
1359 }
1360 }
1361 }
1362 rcu_read_unlock_bh();
1363
1364 return result;
1365}
1366
1367/* Gets referenced address, destroys ifaddr */
1368
1369static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1370{
1371 if (ifp->flags&IFA_F_PERMANENT) {
1372 spin_lock_bh(&ifp->lock);
1373 addrconf_del_timer(ifp);
1374 ifp->flags |= IFA_F_TENTATIVE;
1375 if (dad_failed)
1376 ifp->flags |= IFA_F_DADFAILED;
1377 spin_unlock_bh(&ifp->lock);
1378 if (dad_failed)
1379 ipv6_ifa_notify(0, ifp);
1380 in6_ifa_put(ifp);
1381#ifdef CONFIG_IPV6_PRIVACY
1382 } else if (ifp->flags&IFA_F_TEMPORARY) {
1383 struct inet6_ifaddr *ifpub;
1384 spin_lock_bh(&ifp->lock);
1385 ifpub = ifp->ifpub;
1386 if (ifpub) {
1387 in6_ifa_hold(ifpub);
1388 spin_unlock_bh(&ifp->lock);
1389 ipv6_create_tempaddr(ifpub, ifp);
1390 in6_ifa_put(ifpub);
1391 } else {
1392 spin_unlock_bh(&ifp->lock);
1393 }
1394 ipv6_del_addr(ifp);
1395#endif
1396 } else
1397 ipv6_del_addr(ifp);
1398}
1399
1400static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1401{
1402 int err = -ENOENT;
1403
1404 spin_lock(&ifp->state_lock);
1405 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1406 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1407 err = 0;
1408 }
1409 spin_unlock(&ifp->state_lock);
1410
1411 return err;
1412}
1413
1414void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1415{
1416 struct inet6_dev *idev = ifp->idev;
1417
1418 if (addrconf_dad_end(ifp)) {
1419 in6_ifa_put(ifp);
1420 return;
1421 }
1422
1423 if (net_ratelimit())
1424 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1425 ifp->idev->dev->name, &ifp->addr);
1426
1427 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1428 struct in6_addr addr;
1429
1430 addr.s6_addr32[0] = htonl(0xfe800000);
1431 addr.s6_addr32[1] = 0;
1432
1433 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1434 ipv6_addr_equal(&ifp->addr, &addr)) {
1435 /* DAD failed for link-local based on MAC address */
1436 idev->cnf.disable_ipv6 = 1;
1437
1438 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1439 ifp->idev->dev->name);
1440 }
1441 }
1442
1443 addrconf_dad_stop(ifp, 1);
1444}
1445
1446/* Join to solicited addr multicast group. */
1447
1448void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1449{
1450 struct in6_addr maddr;
1451
1452 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1453 return;
1454
1455 addrconf_addr_solict_mult(addr, &maddr);
1456 ipv6_dev_mc_inc(dev, &maddr);
1457}
1458
1459void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1460{
1461 struct in6_addr maddr;
1462
1463 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1464 return;
1465
1466 addrconf_addr_solict_mult(addr, &maddr);
1467 __ipv6_dev_mc_dec(idev, &maddr);
1468}
1469
1470static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1471{
1472 struct in6_addr addr;
1473 if (ifp->prefix_len == 127) /* RFC 6164 */
1474 return;
1475 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1476 if (ipv6_addr_any(&addr))
1477 return;
1478 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1479}
1480
1481static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1482{
1483 struct in6_addr addr;
1484 if (ifp->prefix_len == 127) /* RFC 6164 */
1485 return;
1486 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1487 if (ipv6_addr_any(&addr))
1488 return;
1489 __ipv6_dev_ac_dec(ifp->idev, &addr);
1490}
1491
1492static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1493{
1494 if (dev->addr_len != ETH_ALEN)
1495 return -1;
1496 memcpy(eui, dev->dev_addr, 3);
1497 memcpy(eui + 5, dev->dev_addr + 3, 3);
1498
1499 /*
1500 * The zSeries OSA network cards can be shared among various
1501 * OS instances, but the OSA cards have only one MAC address.
1502 * This leads to duplicate address conflicts in conjunction
1503 * with IPv6 if more than one instance uses the same card.
1504 *
1505 * The driver for these cards can deliver a unique 16-bit
1506 * identifier for each instance sharing the same card. It is
1507 * placed instead of 0xFFFE in the interface identifier. The
1508 * "u" bit of the interface identifier is not inverted in this
1509 * case. Hence the resulting interface identifier has local
1510 * scope according to RFC2373.
1511 */
1512 if (dev->dev_id) {
1513 eui[3] = (dev->dev_id >> 8) & 0xFF;
1514 eui[4] = dev->dev_id & 0xFF;
1515 } else {
1516 eui[3] = 0xFF;
1517 eui[4] = 0xFE;
1518 eui[0] ^= 2;
1519 }
1520 return 0;
1521}
1522
1523static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1524{
1525 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1526 if (dev->addr_len != ARCNET_ALEN)
1527 return -1;
1528 memset(eui, 0, 7);
1529 eui[7] = *(u8*)dev->dev_addr;
1530 return 0;
1531}
1532
1533static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1534{
1535 if (dev->addr_len != INFINIBAND_ALEN)
1536 return -1;
1537 memcpy(eui, dev->dev_addr + 12, 8);
1538 eui[0] |= 2;
1539 return 0;
1540}
1541
1542static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1543{
1544 if (addr == 0)
1545 return -1;
1546 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1547 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1548 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1549 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1550 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1551 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1552 eui[1] = 0;
1553 eui[2] = 0x5E;
1554 eui[3] = 0xFE;
1555 memcpy(eui + 4, &addr, 4);
1556 return 0;
1557}
1558
1559static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1560{
1561 if (dev->priv_flags & IFF_ISATAP)
1562 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1563 return -1;
1564}
1565
1566static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1567{
1568 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1569}
1570
1571static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1572{
1573 switch (dev->type) {
1574 case ARPHRD_ETHER:
1575 case ARPHRD_FDDI:
1576 case ARPHRD_IEEE802_TR:
1577 return addrconf_ifid_eui48(eui, dev);
1578 case ARPHRD_ARCNET:
1579 return addrconf_ifid_arcnet(eui, dev);
1580 case ARPHRD_INFINIBAND:
1581 return addrconf_ifid_infiniband(eui, dev);
1582 case ARPHRD_SIT:
1583 return addrconf_ifid_sit(eui, dev);
1584 case ARPHRD_IPGRE:
1585 return addrconf_ifid_gre(eui, dev);
1586 }
1587 return -1;
1588}
1589
1590static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1591{
1592 int err = -1;
1593 struct inet6_ifaddr *ifp;
1594
1595 read_lock_bh(&idev->lock);
1596 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1597 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1598 memcpy(eui, ifp->addr.s6_addr+8, 8);
1599 err = 0;
1600 break;
1601 }
1602 }
1603 read_unlock_bh(&idev->lock);
1604 return err;
1605}
1606
1607#ifdef CONFIG_IPV6_PRIVACY
1608/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1609static int __ipv6_regen_rndid(struct inet6_dev *idev)
1610{
1611regen:
1612 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1613 idev->rndid[0] &= ~0x02;
1614
1615 /*
1616 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1617 * check if generated address is not inappropriate
1618 *
1619 * - Reserved subnet anycast (RFC 2526)
1620 * 11111101 11....11 1xxxxxxx
1621 * - ISATAP (RFC4214) 6.1
1622 * 00-00-5E-FE-xx-xx-xx-xx
1623 * - value 0
1624 * - XXX: already assigned to an address on the device
1625 */
1626 if (idev->rndid[0] == 0xfd &&
1627 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1628 (idev->rndid[7]&0x80))
1629 goto regen;
1630 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1631 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1632 goto regen;
1633 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1634 goto regen;
1635 }
1636
1637 return 0;
1638}
1639
1640static void ipv6_regen_rndid(unsigned long data)
1641{
1642 struct inet6_dev *idev = (struct inet6_dev *) data;
1643 unsigned long expires;
1644
1645 rcu_read_lock_bh();
1646 write_lock_bh(&idev->lock);
1647
1648 if (idev->dead)
1649 goto out;
1650
1651 if (__ipv6_regen_rndid(idev) < 0)
1652 goto out;
1653
1654 expires = jiffies +
1655 idev->cnf.temp_prefered_lft * HZ -
1656 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1657 idev->cnf.max_desync_factor * HZ;
1658 if (time_before(expires, jiffies)) {
1659 printk(KERN_WARNING
1660 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1661 idev->dev->name);
1662 goto out;
1663 }
1664
1665 if (!mod_timer(&idev->regen_timer, expires))
1666 in6_dev_hold(idev);
1667
1668out:
1669 write_unlock_bh(&idev->lock);
1670 rcu_read_unlock_bh();
1671 in6_dev_put(idev);
1672}
1673
1674static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1675 int ret = 0;
1676
1677 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1678 ret = __ipv6_regen_rndid(idev);
1679 return ret;
1680}
1681#endif
1682
1683/*
1684 * Add prefix route.
1685 */
1686
1687static void
1688addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1689 unsigned long expires, u32 flags)
1690{
1691 struct fib6_config cfg = {
1692 .fc_table = RT6_TABLE_PREFIX,
1693 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1694 .fc_ifindex = dev->ifindex,
1695 .fc_expires = expires,
1696 .fc_dst_len = plen,
1697 .fc_flags = RTF_UP | flags,
1698 .fc_nlinfo.nl_net = dev_net(dev),
1699 .fc_protocol = RTPROT_KERNEL,
1700 };
1701
1702 ipv6_addr_copy(&cfg.fc_dst, pfx);
1703
1704 /* Prevent useless cloning on PtP SIT.
1705 This thing is done here expecting that the whole
1706 class of non-broadcast devices need not cloning.
1707 */
1708#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1709 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1710 cfg.fc_flags |= RTF_NONEXTHOP;
1711#endif
1712
1713 ip6_route_add(&cfg);
1714}
1715
1716/* Create "default" multicast route to the interface */
1717
1718static void addrconf_add_mroute(struct net_device *dev)
1719{
1720 struct fib6_config cfg = {
1721 .fc_table = RT6_TABLE_LOCAL,
1722 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1723 .fc_ifindex = dev->ifindex,
1724 .fc_dst_len = 8,
1725 .fc_flags = RTF_UP,
1726 .fc_nlinfo.nl_net = dev_net(dev),
1727 };
1728
1729 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1730
1731 ip6_route_add(&cfg);
1732}
1733
1734#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1735static void sit_route_add(struct net_device *dev)
1736{
1737 struct fib6_config cfg = {
1738 .fc_table = RT6_TABLE_MAIN,
1739 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1740 .fc_ifindex = dev->ifindex,
1741 .fc_dst_len = 96,
1742 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1743 .fc_nlinfo.nl_net = dev_net(dev),
1744 };
1745
1746 /* prefix length - 96 bits "::d.d.d.d" */
1747 ip6_route_add(&cfg);
1748}
1749#endif
1750
1751static void addrconf_add_lroute(struct net_device *dev)
1752{
1753 struct in6_addr addr;
1754
1755 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1756 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1757}
1758
1759static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1760{
1761 struct inet6_dev *idev;
1762
1763 ASSERT_RTNL();
1764
1765 idev = ipv6_find_idev(dev);
1766 if (!idev)
1767 return ERR_PTR(-ENOBUFS);
1768
1769 if (idev->cnf.disable_ipv6)
1770 return ERR_PTR(-EACCES);
1771
1772 /* Add default multicast route */
1773 addrconf_add_mroute(dev);
1774
1775 /* Add link local route */
1776 addrconf_add_lroute(dev);
1777 return idev;
1778}
1779
1780void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1781{
1782 struct prefix_info *pinfo;
1783 __u32 valid_lft;
1784 __u32 prefered_lft;
1785 int addr_type;
1786 struct inet6_dev *in6_dev;
1787 struct net *net = dev_net(dev);
1788
1789 pinfo = (struct prefix_info *) opt;
1790
1791 if (len < sizeof(struct prefix_info)) {
1792 ADBG(("addrconf: prefix option too short\n"));
1793 return;
1794 }
1795
1796 /*
1797 * Validation checks ([ADDRCONF], page 19)
1798 */
1799
1800 addr_type = ipv6_addr_type(&pinfo->prefix);
1801
1802 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1803 return;
1804
1805 valid_lft = ntohl(pinfo->valid);
1806 prefered_lft = ntohl(pinfo->prefered);
1807
1808 if (prefered_lft > valid_lft) {
1809 if (net_ratelimit())
1810 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1811 return;
1812 }
1813
1814 in6_dev = in6_dev_get(dev);
1815
1816 if (in6_dev == NULL) {
1817 if (net_ratelimit())
1818 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1819 return;
1820 }
1821
1822 /*
1823 * Two things going on here:
1824 * 1) Add routes for on-link prefixes
1825 * 2) Configure prefixes with the auto flag set
1826 */
1827
1828 if (pinfo->onlink) {
1829 struct rt6_info *rt;
1830 unsigned long rt_expires;
1831
1832 /* Avoid arithmetic overflow. Really, we could
1833 * save rt_expires in seconds, likely valid_lft,
1834 * but it would require division in fib gc, that it
1835 * not good.
1836 */
1837 if (HZ > USER_HZ)
1838 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1839 else
1840 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1841
1842 if (addrconf_finite_timeout(rt_expires))
1843 rt_expires *= HZ;
1844
1845 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1846 dev->ifindex, 1);
1847
1848 if (rt && addrconf_is_prefix_route(rt)) {
1849 /* Autoconf prefix route */
1850 if (valid_lft == 0) {
1851 ip6_del_rt(rt);
1852 rt = NULL;
1853 } else if (addrconf_finite_timeout(rt_expires)) {
1854 /* not infinity */
1855 rt->rt6i_expires = jiffies + rt_expires;
1856 rt->rt6i_flags |= RTF_EXPIRES;
1857 } else {
1858 rt->rt6i_flags &= ~RTF_EXPIRES;
1859 rt->rt6i_expires = 0;
1860 }
1861 } else if (valid_lft) {
1862 clock_t expires = 0;
1863 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1864 if (addrconf_finite_timeout(rt_expires)) {
1865 /* not infinity */
1866 flags |= RTF_EXPIRES;
1867 expires = jiffies_to_clock_t(rt_expires);
1868 }
1869 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1870 dev, expires, flags);
1871 }
1872 if (rt)
1873 dst_release(&rt->dst);
1874 }
1875
1876 /* Try to figure out our local address for this prefix */
1877
1878 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1879 struct inet6_ifaddr * ifp;
1880 struct in6_addr addr;
1881 int create = 0, update_lft = 0;
1882
1883 if (pinfo->prefix_len == 64) {
1884 memcpy(&addr, &pinfo->prefix, 8);
1885 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1886 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1887 in6_dev_put(in6_dev);
1888 return;
1889 }
1890 goto ok;
1891 }
1892 if (net_ratelimit())
1893 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1894 pinfo->prefix_len);
1895 in6_dev_put(in6_dev);
1896 return;
1897
1898ok:
1899
1900 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1901
1902 if (ifp == NULL && valid_lft) {
1903 int max_addresses = in6_dev->cnf.max_addresses;
1904 u32 addr_flags = 0;
1905
1906#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1907 if (in6_dev->cnf.optimistic_dad &&
1908 !net->ipv6.devconf_all->forwarding)
1909 addr_flags = IFA_F_OPTIMISTIC;
1910#endif
1911
1912 /* Do not allow to create too much of autoconfigured
1913 * addresses; this would be too easy way to crash kernel.
1914 */
1915 if (!max_addresses ||
1916 ipv6_count_addresses(in6_dev) < max_addresses)
1917 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1918 addr_type&IPV6_ADDR_SCOPE_MASK,
1919 addr_flags);
1920
1921 if (!ifp || IS_ERR(ifp)) {
1922 in6_dev_put(in6_dev);
1923 return;
1924 }
1925
1926 update_lft = create = 1;
1927 ifp->cstamp = jiffies;
1928 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1929 }
1930
1931 if (ifp) {
1932 int flags;
1933 unsigned long now;
1934#ifdef CONFIG_IPV6_PRIVACY
1935 struct inet6_ifaddr *ift;
1936#endif
1937 u32 stored_lft;
1938
1939 /* update lifetime (RFC2462 5.5.3 e) */
1940 spin_lock(&ifp->lock);
1941 now = jiffies;
1942 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1943 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1944 else
1945 stored_lft = 0;
1946 if (!update_lft && stored_lft) {
1947 if (valid_lft > MIN_VALID_LIFETIME ||
1948 valid_lft > stored_lft)
1949 update_lft = 1;
1950 else if (stored_lft <= MIN_VALID_LIFETIME) {
1951 /* valid_lft <= stored_lft is always true */
1952 /*
1953 * RFC 4862 Section 5.5.3e:
1954 * "Note that the preferred lifetime of
1955 * the corresponding address is always
1956 * reset to the Preferred Lifetime in
1957 * the received Prefix Information
1958 * option, regardless of whether the
1959 * valid lifetime is also reset or
1960 * ignored."
1961 *
1962 * So if the preferred lifetime in
1963 * this advertisement is different
1964 * than what we have stored, but the
1965 * valid lifetime is invalid, just
1966 * reset prefered_lft.
1967 *
1968 * We must set the valid lifetime
1969 * to the stored lifetime since we'll
1970 * be updating the timestamp below,
1971 * else we'll set it back to the
1972 * minimum.
1973 */
1974 if (prefered_lft != ifp->prefered_lft) {
1975 valid_lft = stored_lft;
1976 update_lft = 1;
1977 }
1978 } else {
1979 valid_lft = MIN_VALID_LIFETIME;
1980 if (valid_lft < prefered_lft)
1981 prefered_lft = valid_lft;
1982 update_lft = 1;
1983 }
1984 }
1985
1986 if (update_lft) {
1987 ifp->valid_lft = valid_lft;
1988 ifp->prefered_lft = prefered_lft;
1989 ifp->tstamp = now;
1990 flags = ifp->flags;
1991 ifp->flags &= ~IFA_F_DEPRECATED;
1992 spin_unlock(&ifp->lock);
1993
1994 if (!(flags&IFA_F_TENTATIVE))
1995 ipv6_ifa_notify(0, ifp);
1996 } else
1997 spin_unlock(&ifp->lock);
1998
1999#ifdef CONFIG_IPV6_PRIVACY
2000 read_lock_bh(&in6_dev->lock);
2001 /* update all temporary addresses in the list */
2002 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
2003 /*
2004 * When adjusting the lifetimes of an existing
2005 * temporary address, only lower the lifetimes.
2006 * Implementations must not increase the
2007 * lifetimes of an existing temporary address
2008 * when processing a Prefix Information Option.
2009 */
2010 if (ifp != ift->ifpub)
2011 continue;
2012
2013 spin_lock(&ift->lock);
2014 flags = ift->flags;
2015 if (ift->valid_lft > valid_lft &&
2016 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
2017 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
2018 if (ift->prefered_lft > prefered_lft &&
2019 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
2020 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
2021 spin_unlock(&ift->lock);
2022 if (!(flags&IFA_F_TENTATIVE))
2023 ipv6_ifa_notify(0, ift);
2024 }
2025
2026 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2027 /*
2028 * When a new public address is created as described in [ADDRCONF],
2029 * also create a new temporary address. Also create a temporary
2030 * address if it's enabled but no temporary address currently exists.
2031 */
2032 read_unlock_bh(&in6_dev->lock);
2033 ipv6_create_tempaddr(ifp, NULL);
2034 } else {
2035 read_unlock_bh(&in6_dev->lock);
2036 }
2037#endif
2038 in6_ifa_put(ifp);
2039 addrconf_verify(0);
2040 }
2041 }
2042 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2043 in6_dev_put(in6_dev);
2044}
2045
2046/*
2047 * Set destination address.
2048 * Special case for SIT interfaces where we create a new "virtual"
2049 * device.
2050 */
2051int addrconf_set_dstaddr(struct net *net, void __user *arg)
2052{
2053 struct in6_ifreq ireq;
2054 struct net_device *dev;
2055 int err = -EINVAL;
2056
2057 rtnl_lock();
2058
2059 err = -EFAULT;
2060 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2061 goto err_exit;
2062
2063 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2064
2065 err = -ENODEV;
2066 if (dev == NULL)
2067 goto err_exit;
2068
2069#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2070 if (dev->type == ARPHRD_SIT) {
2071 const struct net_device_ops *ops = dev->netdev_ops;
2072 struct ifreq ifr;
2073 struct ip_tunnel_parm p;
2074
2075 err = -EADDRNOTAVAIL;
2076 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2077 goto err_exit;
2078
2079 memset(&p, 0, sizeof(p));
2080 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2081 p.iph.saddr = 0;
2082 p.iph.version = 4;
2083 p.iph.ihl = 5;
2084 p.iph.protocol = IPPROTO_IPV6;
2085 p.iph.ttl = 64;
2086 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2087
2088 if (ops->ndo_do_ioctl) {
2089 mm_segment_t oldfs = get_fs();
2090
2091 set_fs(KERNEL_DS);
2092 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2093 set_fs(oldfs);
2094 } else
2095 err = -EOPNOTSUPP;
2096
2097 if (err == 0) {
2098 err = -ENOBUFS;
2099 dev = __dev_get_by_name(net, p.name);
2100 if (!dev)
2101 goto err_exit;
2102 err = dev_open(dev);
2103 }
2104 }
2105#endif
2106
2107err_exit:
2108 rtnl_unlock();
2109 return err;
2110}
2111
2112/*
2113 * Manual configuration of address on an interface
2114 */
2115static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2116 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2117 __u32 valid_lft)
2118{
2119 struct inet6_ifaddr *ifp;
2120 struct inet6_dev *idev;
2121 struct net_device *dev;
2122 int scope;
2123 u32 flags;
2124 clock_t expires;
2125 unsigned long timeout;
2126
2127 ASSERT_RTNL();
2128
2129 if (plen > 128)
2130 return -EINVAL;
2131
2132 /* check the lifetime */
2133 if (!valid_lft || prefered_lft > valid_lft)
2134 return -EINVAL;
2135
2136 dev = __dev_get_by_index(net, ifindex);
2137 if (!dev)
2138 return -ENODEV;
2139
2140 idev = addrconf_add_dev(dev);
2141 if (IS_ERR(idev))
2142 return PTR_ERR(idev);
2143
2144 scope = ipv6_addr_scope(pfx);
2145
2146 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2147 if (addrconf_finite_timeout(timeout)) {
2148 expires = jiffies_to_clock_t(timeout * HZ);
2149 valid_lft = timeout;
2150 flags = RTF_EXPIRES;
2151 } else {
2152 expires = 0;
2153 flags = 0;
2154 ifa_flags |= IFA_F_PERMANENT;
2155 }
2156
2157 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2158 if (addrconf_finite_timeout(timeout)) {
2159 if (timeout == 0)
2160 ifa_flags |= IFA_F_DEPRECATED;
2161 prefered_lft = timeout;
2162 }
2163
2164 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2165
2166 if (!IS_ERR(ifp)) {
2167 spin_lock_bh(&ifp->lock);
2168 ifp->valid_lft = valid_lft;
2169 ifp->prefered_lft = prefered_lft;
2170 ifp->tstamp = jiffies;
2171 spin_unlock_bh(&ifp->lock);
2172
2173 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2174 expires, flags);
2175 /*
2176 * Note that section 3.1 of RFC 4429 indicates
2177 * that the Optimistic flag should not be set for
2178 * manually configured addresses
2179 */
2180 addrconf_dad_start(ifp, 0);
2181 in6_ifa_put(ifp);
2182 addrconf_verify(0);
2183 return 0;
2184 }
2185
2186 return PTR_ERR(ifp);
2187}
2188
2189static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2190 unsigned int plen)
2191{
2192 struct inet6_ifaddr *ifp;
2193 struct inet6_dev *idev;
2194 struct net_device *dev;
2195
2196 if (plen > 128)
2197 return -EINVAL;
2198
2199 dev = __dev_get_by_index(net, ifindex);
2200 if (!dev)
2201 return -ENODEV;
2202
2203 if ((idev = __in6_dev_get(dev)) == NULL)
2204 return -ENXIO;
2205
2206 read_lock_bh(&idev->lock);
2207 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2208 if (ifp->prefix_len == plen &&
2209 ipv6_addr_equal(pfx, &ifp->addr)) {
2210 in6_ifa_hold(ifp);
2211 read_unlock_bh(&idev->lock);
2212
2213 ipv6_del_addr(ifp);
2214
2215 /* If the last address is deleted administratively,
2216 disable IPv6 on this interface.
2217 */
2218 if (list_empty(&idev->addr_list))
2219 addrconf_ifdown(idev->dev, 1);
2220 return 0;
2221 }
2222 }
2223 read_unlock_bh(&idev->lock);
2224 return -EADDRNOTAVAIL;
2225}
2226
2227
2228int addrconf_add_ifaddr(struct net *net, void __user *arg)
2229{
2230 struct in6_ifreq ireq;
2231 int err;
2232
2233 if (!capable(CAP_NET_ADMIN))
2234 return -EPERM;
2235
2236 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2237 return -EFAULT;
2238
2239 rtnl_lock();
2240 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2241 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2242 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2243 rtnl_unlock();
2244 return err;
2245}
2246
2247int addrconf_del_ifaddr(struct net *net, void __user *arg)
2248{
2249 struct in6_ifreq ireq;
2250 int err;
2251
2252 if (!capable(CAP_NET_ADMIN))
2253 return -EPERM;
2254
2255 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2256 return -EFAULT;
2257
2258 rtnl_lock();
2259 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2260 ireq.ifr6_prefixlen);
2261 rtnl_unlock();
2262 return err;
2263}
2264
2265static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2266 int plen, int scope)
2267{
2268 struct inet6_ifaddr *ifp;
2269
2270 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2271 if (!IS_ERR(ifp)) {
2272 spin_lock_bh(&ifp->lock);
2273 ifp->flags &= ~IFA_F_TENTATIVE;
2274 spin_unlock_bh(&ifp->lock);
2275 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2276 in6_ifa_put(ifp);
2277 }
2278}
2279
2280#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2281static void sit_add_v4_addrs(struct inet6_dev *idev)
2282{
2283 struct in6_addr addr;
2284 struct net_device *dev;
2285 struct net *net = dev_net(idev->dev);
2286 int scope;
2287
2288 ASSERT_RTNL();
2289
2290 memset(&addr, 0, sizeof(struct in6_addr));
2291 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2292
2293 if (idev->dev->flags&IFF_POINTOPOINT) {
2294 addr.s6_addr32[0] = htonl(0xfe800000);
2295 scope = IFA_LINK;
2296 } else {
2297 scope = IPV6_ADDR_COMPATv4;
2298 }
2299
2300 if (addr.s6_addr32[3]) {
2301 add_addr(idev, &addr, 128, scope);
2302 return;
2303 }
2304
2305 for_each_netdev(net, dev) {
2306 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2307 if (in_dev && (dev->flags & IFF_UP)) {
2308 struct in_ifaddr * ifa;
2309
2310 int flag = scope;
2311
2312 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2313 int plen;
2314
2315 addr.s6_addr32[3] = ifa->ifa_local;
2316
2317 if (ifa->ifa_scope == RT_SCOPE_LINK)
2318 continue;
2319 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2320 if (idev->dev->flags&IFF_POINTOPOINT)
2321 continue;
2322 flag |= IFA_HOST;
2323 }
2324 if (idev->dev->flags&IFF_POINTOPOINT)
2325 plen = 64;
2326 else
2327 plen = 96;
2328
2329 add_addr(idev, &addr, plen, flag);
2330 }
2331 }
2332 }
2333}
2334#endif
2335
2336static void init_loopback(struct net_device *dev)
2337{
2338 struct inet6_dev *idev;
2339
2340 /* ::1 */
2341
2342 ASSERT_RTNL();
2343
2344 if ((idev = ipv6_find_idev(dev)) == NULL) {
2345 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2346 return;
2347 }
2348
2349 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2350}
2351
2352static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2353{
2354 struct inet6_ifaddr * ifp;
2355 u32 addr_flags = IFA_F_PERMANENT;
2356
2357#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2358 if (idev->cnf.optimistic_dad &&
2359 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2360 addr_flags |= IFA_F_OPTIMISTIC;
2361#endif
2362
2363
2364 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2365 if (!IS_ERR(ifp)) {
2366 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2367 addrconf_dad_start(ifp, 0);
2368 in6_ifa_put(ifp);
2369 }
2370}
2371
2372static void addrconf_dev_config(struct net_device *dev)
2373{
2374 struct in6_addr addr;
2375 struct inet6_dev * idev;
2376
2377 ASSERT_RTNL();
2378
2379 if ((dev->type != ARPHRD_ETHER) &&
2380 (dev->type != ARPHRD_FDDI) &&
2381 (dev->type != ARPHRD_IEEE802_TR) &&
2382 (dev->type != ARPHRD_ARCNET) &&
2383 (dev->type != ARPHRD_INFINIBAND)) {
2384 /* Alas, we support only Ethernet autoconfiguration. */
2385 return;
2386 }
2387
2388 idev = addrconf_add_dev(dev);
2389 if (IS_ERR(idev))
2390 return;
2391
2392 memset(&addr, 0, sizeof(struct in6_addr));
2393 addr.s6_addr32[0] = htonl(0xFE800000);
2394
2395 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2396 addrconf_add_linklocal(idev, &addr);
2397}
2398
2399#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2400static void addrconf_sit_config(struct net_device *dev)
2401{
2402 struct inet6_dev *idev;
2403
2404 ASSERT_RTNL();
2405
2406 /*
2407 * Configure the tunnel with one of our IPv4
2408 * addresses... we should configure all of
2409 * our v4 addrs in the tunnel
2410 */
2411
2412 if ((idev = ipv6_find_idev(dev)) == NULL) {
2413 printk(KERN_DEBUG "init sit: add_dev failed\n");
2414 return;
2415 }
2416
2417 if (dev->priv_flags & IFF_ISATAP) {
2418 struct in6_addr addr;
2419
2420 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2421 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2422 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2423 addrconf_add_linklocal(idev, &addr);
2424 return;
2425 }
2426
2427 sit_add_v4_addrs(idev);
2428
2429 if (dev->flags&IFF_POINTOPOINT) {
2430 addrconf_add_mroute(dev);
2431 addrconf_add_lroute(dev);
2432 } else
2433 sit_route_add(dev);
2434}
2435#endif
2436
2437#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2438static void addrconf_gre_config(struct net_device *dev)
2439{
2440 struct inet6_dev *idev;
2441 struct in6_addr addr;
2442
2443 pr_info("ipv6: addrconf_gre_config(%s)\n", dev->name);
2444
2445 ASSERT_RTNL();
2446
2447 if ((idev = ipv6_find_idev(dev)) == NULL) {
2448 printk(KERN_DEBUG "init gre: add_dev failed\n");
2449 return;
2450 }
2451
2452 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2453 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2454
2455 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2456 addrconf_add_linklocal(idev, &addr);
2457}
2458#endif
2459
2460static inline int
2461ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2462{
2463 struct in6_addr lladdr;
2464
2465 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2466 addrconf_add_linklocal(idev, &lladdr);
2467 return 0;
2468 }
2469 return -1;
2470}
2471
2472static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2473{
2474 struct net_device *link_dev;
2475 struct net *net = dev_net(idev->dev);
2476
2477 /* first try to inherit the link-local address from the link device */
2478 if (idev->dev->iflink &&
2479 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2480 if (!ipv6_inherit_linklocal(idev, link_dev))
2481 return;
2482 }
2483 /* then try to inherit it from any device */
2484 for_each_netdev(net, link_dev) {
2485 if (!ipv6_inherit_linklocal(idev, link_dev))
2486 return;
2487 }
2488 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2489}
2490
2491/*
2492 * Autoconfigure tunnel with a link-local address so routing protocols,
2493 * DHCPv6, MLD etc. can be run over the virtual link
2494 */
2495
2496static void addrconf_ip6_tnl_config(struct net_device *dev)
2497{
2498 struct inet6_dev *idev;
2499
2500 ASSERT_RTNL();
2501
2502 idev = addrconf_add_dev(dev);
2503 if (IS_ERR(idev)) {
2504 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2505 return;
2506 }
2507 ip6_tnl_add_linklocal(idev);
2508}
2509
2510static int addrconf_notify(struct notifier_block *this, unsigned long event,
2511 void * data)
2512{
2513 struct net_device *dev = (struct net_device *) data;
2514 struct inet6_dev *idev = __in6_dev_get(dev);
2515 int run_pending = 0;
2516 int err;
2517
2518 switch (event) {
2519 case NETDEV_REGISTER:
2520 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2521 idev = ipv6_add_dev(dev);
2522 if (!idev)
2523 return notifier_from_errno(-ENOMEM);
2524 }
2525 break;
2526
2527 case NETDEV_UP:
2528 case NETDEV_CHANGE:
2529 if (dev->flags & IFF_SLAVE)
2530 break;
2531
2532 if (event == NETDEV_UP) {
2533 if (!addrconf_qdisc_ok(dev)) {
2534 /* device is not ready yet. */
2535 printk(KERN_INFO
2536 "ADDRCONF(NETDEV_UP): %s: "
2537 "link is not ready\n",
2538 dev->name);
2539 break;
2540 }
2541
2542 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2543 idev = ipv6_add_dev(dev);
2544
2545 if (idev) {
2546 idev->if_flags |= IF_READY;
2547 run_pending = 1;
2548 }
2549 } else {
2550 if (!addrconf_qdisc_ok(dev)) {
2551 /* device is still not ready. */
2552 break;
2553 }
2554
2555 if (idev) {
2556 if (idev->if_flags & IF_READY)
2557 /* device is already configured. */
2558 break;
2559 idev->if_flags |= IF_READY;
2560 }
2561
2562 printk(KERN_INFO
2563 "ADDRCONF(NETDEV_CHANGE): %s: "
2564 "link becomes ready\n",
2565 dev->name);
2566
2567 run_pending = 1;
2568 }
2569
2570 switch (dev->type) {
2571#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2572 case ARPHRD_SIT:
2573 addrconf_sit_config(dev);
2574 break;
2575#endif
2576#if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2577 case ARPHRD_IPGRE:
2578 addrconf_gre_config(dev);
2579 break;
2580#endif
2581 case ARPHRD_TUNNEL6:
2582 addrconf_ip6_tnl_config(dev);
2583 break;
2584 case ARPHRD_LOOPBACK:
2585 init_loopback(dev);
2586 break;
2587
2588 default:
2589 addrconf_dev_config(dev);
2590 break;
2591 }
2592
2593 if (idev) {
2594 if (run_pending)
2595 addrconf_dad_run(idev);
2596
2597 /*
2598 * If the MTU changed during the interface down,
2599 * when the interface up, the changed MTU must be
2600 * reflected in the idev as well as routers.
2601 */
2602 if (idev->cnf.mtu6 != dev->mtu &&
2603 dev->mtu >= IPV6_MIN_MTU) {
2604 rt6_mtu_change(dev, dev->mtu);
2605 idev->cnf.mtu6 = dev->mtu;
2606 }
2607 idev->tstamp = jiffies;
2608 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2609
2610 /*
2611 * If the changed mtu during down is lower than
2612 * IPV6_MIN_MTU stop IPv6 on this interface.
2613 */
2614 if (dev->mtu < IPV6_MIN_MTU)
2615 addrconf_ifdown(dev, 1);
2616 }
2617 break;
2618
2619 case NETDEV_CHANGEMTU:
2620 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2621 rt6_mtu_change(dev, dev->mtu);
2622 idev->cnf.mtu6 = dev->mtu;
2623 break;
2624 }
2625
2626 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2627 idev = ipv6_add_dev(dev);
2628 if (idev)
2629 break;
2630 }
2631
2632 /*
2633 * MTU falled under IPV6_MIN_MTU.
2634 * Stop IPv6 on this interface.
2635 */
2636
2637 case NETDEV_DOWN:
2638 case NETDEV_UNREGISTER:
2639 /*
2640 * Remove all addresses from this interface.
2641 */
2642 addrconf_ifdown(dev, event != NETDEV_DOWN);
2643 break;
2644
2645 case NETDEV_CHANGENAME:
2646 if (idev) {
2647 snmp6_unregister_dev(idev);
2648 addrconf_sysctl_unregister(idev);
2649 addrconf_sysctl_register(idev);
2650 err = snmp6_register_dev(idev);
2651 if (err)
2652 return notifier_from_errno(err);
2653 }
2654 break;
2655
2656 case NETDEV_PRE_TYPE_CHANGE:
2657 case NETDEV_POST_TYPE_CHANGE:
2658 addrconf_type_change(dev, event);
2659 break;
2660 }
2661
2662 return NOTIFY_OK;
2663}
2664
2665/*
2666 * addrconf module should be notified of a device going up
2667 */
2668static struct notifier_block ipv6_dev_notf = {
2669 .notifier_call = addrconf_notify,
2670};
2671
2672static void addrconf_type_change(struct net_device *dev, unsigned long event)
2673{
2674 struct inet6_dev *idev;
2675 ASSERT_RTNL();
2676
2677 idev = __in6_dev_get(dev);
2678
2679 if (event == NETDEV_POST_TYPE_CHANGE)
2680 ipv6_mc_remap(idev);
2681 else if (event == NETDEV_PRE_TYPE_CHANGE)
2682 ipv6_mc_unmap(idev);
2683}
2684
2685static int addrconf_ifdown(struct net_device *dev, int how)
2686{
2687 struct net *net = dev_net(dev);
2688 struct inet6_dev *idev;
2689 struct inet6_ifaddr *ifa;
2690 int state, i;
2691
2692 ASSERT_RTNL();
2693
2694 rt6_ifdown(net, dev);
2695 neigh_ifdown(&nd_tbl, dev);
2696
2697 idev = __in6_dev_get(dev);
2698 if (idev == NULL)
2699 return -ENODEV;
2700
2701 /*
2702 * Step 1: remove reference to ipv6 device from parent device.
2703 * Do not dev_put!
2704 */
2705 if (how) {
2706 idev->dead = 1;
2707
2708 /* protected by rtnl_lock */
2709 rcu_assign_pointer(dev->ip6_ptr, NULL);
2710
2711 /* Step 1.5: remove snmp6 entry */
2712 snmp6_unregister_dev(idev);
2713
2714 }
2715
2716 /* Step 2: clear hash table */
2717 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2718 struct hlist_head *h = &inet6_addr_lst[i];
2719 struct hlist_node *n;
2720
2721 spin_lock_bh(&addrconf_hash_lock);
2722 restart:
2723 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2724 if (ifa->idev == idev) {
2725 hlist_del_init_rcu(&ifa->addr_lst);
2726 addrconf_del_timer(ifa);
2727 goto restart;
2728 }
2729 }
2730 spin_unlock_bh(&addrconf_hash_lock);
2731 }
2732
2733 write_lock_bh(&idev->lock);
2734
2735 /* Step 2: clear flags for stateless addrconf */
2736 if (!how)
2737 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2738
2739#ifdef CONFIG_IPV6_PRIVACY
2740 if (how && del_timer(&idev->regen_timer))
2741 in6_dev_put(idev);
2742
2743 /* Step 3: clear tempaddr list */
2744 while (!list_empty(&idev->tempaddr_list)) {
2745 ifa = list_first_entry(&idev->tempaddr_list,
2746 struct inet6_ifaddr, tmp_list);
2747 list_del(&ifa->tmp_list);
2748 write_unlock_bh(&idev->lock);
2749 spin_lock_bh(&ifa->lock);
2750
2751 if (ifa->ifpub) {
2752 in6_ifa_put(ifa->ifpub);
2753 ifa->ifpub = NULL;
2754 }
2755 spin_unlock_bh(&ifa->lock);
2756 in6_ifa_put(ifa);
2757 write_lock_bh(&idev->lock);
2758 }
2759#endif
2760
2761 while (!list_empty(&idev->addr_list)) {
2762 ifa = list_first_entry(&idev->addr_list,
2763 struct inet6_ifaddr, if_list);
2764 addrconf_del_timer(ifa);
2765
2766 list_del(&ifa->if_list);
2767
2768 write_unlock_bh(&idev->lock);
2769
2770 spin_lock_bh(&ifa->state_lock);
2771 state = ifa->state;
2772 ifa->state = INET6_IFADDR_STATE_DEAD;
2773 spin_unlock_bh(&ifa->state_lock);
2774
2775 if (state != INET6_IFADDR_STATE_DEAD) {
2776 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2777 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2778 }
2779 in6_ifa_put(ifa);
2780
2781 write_lock_bh(&idev->lock);
2782 }
2783
2784 write_unlock_bh(&idev->lock);
2785
2786 /* Step 5: Discard multicast list */
2787 if (how)
2788 ipv6_mc_destroy_dev(idev);
2789 else
2790 ipv6_mc_down(idev);
2791
2792 idev->tstamp = jiffies;
2793
2794 /* Last: Shot the device (if unregistered) */
2795 if (how) {
2796 addrconf_sysctl_unregister(idev);
2797 neigh_parms_release(&nd_tbl, idev->nd_parms);
2798 neigh_ifdown(&nd_tbl, dev);
2799 in6_dev_put(idev);
2800 }
2801 return 0;
2802}
2803
2804static void addrconf_rs_timer(unsigned long data)
2805{
2806 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2807 struct inet6_dev *idev = ifp->idev;
2808
2809 read_lock(&idev->lock);
2810 if (idev->dead || !(idev->if_flags & IF_READY))
2811 goto out;
2812
2813 if (idev->cnf.forwarding)
2814 goto out;
2815
2816 /* Announcement received after solicitation was sent */
2817 if (idev->if_flags & IF_RA_RCVD)
2818 goto out;
2819
2820 spin_lock(&ifp->lock);
2821 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2822 /* The wait after the last probe can be shorter */
2823 addrconf_mod_timer(ifp, AC_RS,
2824 (ifp->probes == idev->cnf.rtr_solicits) ?
2825 idev->cnf.rtr_solicit_delay :
2826 idev->cnf.rtr_solicit_interval);
2827 spin_unlock(&ifp->lock);
2828
2829 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2830 } else {
2831 spin_unlock(&ifp->lock);
2832 /*
2833 * Note: we do not support deprecated "all on-link"
2834 * assumption any longer.
2835 */
2836 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2837 idev->dev->name);
2838 }
2839
2840out:
2841 read_unlock(&idev->lock);
2842 in6_ifa_put(ifp);
2843}
2844
2845/*
2846 * Duplicate Address Detection
2847 */
2848static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2849{
2850 unsigned long rand_num;
2851 struct inet6_dev *idev = ifp->idev;
2852
2853 if (ifp->flags & IFA_F_OPTIMISTIC)
2854 rand_num = 0;
2855 else
2856 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2857
2858 ifp->probes = idev->cnf.dad_transmits;
2859 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2860}
2861
2862static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2863{
2864 struct inet6_dev *idev = ifp->idev;
2865 struct net_device *dev = idev->dev;
2866
2867 addrconf_join_solict(dev, &ifp->addr);
2868
2869 net_srandom(ifp->addr.s6_addr32[3]);
2870
2871 read_lock_bh(&idev->lock);
2872 spin_lock(&ifp->lock);
2873 if (ifp->state == INET6_IFADDR_STATE_DEAD)
2874 goto out;
2875
2876 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2877 idev->cnf.accept_dad < 1 ||
2878 !(ifp->flags&IFA_F_TENTATIVE) ||
2879 ifp->flags & IFA_F_NODAD) {
2880 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2881 spin_unlock(&ifp->lock);
2882 read_unlock_bh(&idev->lock);
2883
2884 addrconf_dad_completed(ifp);
2885 return;
2886 }
2887
2888 if (!(idev->if_flags & IF_READY)) {
2889 spin_unlock(&ifp->lock);
2890 read_unlock_bh(&idev->lock);
2891 /*
2892 * If the device is not ready:
2893 * - keep it tentative if it is a permanent address.
2894 * - otherwise, kill it.
2895 */
2896 in6_ifa_hold(ifp);
2897 addrconf_dad_stop(ifp, 0);
2898 return;
2899 }
2900
2901 /*
2902 * Optimistic nodes can start receiving
2903 * Frames right away
2904 */
2905 if (ifp->flags & IFA_F_OPTIMISTIC)
2906 ip6_ins_rt(ifp->rt);
2907
2908 addrconf_dad_kick(ifp);
2909out:
2910 spin_unlock(&ifp->lock);
2911 read_unlock_bh(&idev->lock);
2912}
2913
2914static void addrconf_dad_timer(unsigned long data)
2915{
2916 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2917 struct inet6_dev *idev = ifp->idev;
2918 struct in6_addr mcaddr;
2919
2920 if (!ifp->probes && addrconf_dad_end(ifp))
2921 goto out;
2922
2923 read_lock(&idev->lock);
2924 if (idev->dead || !(idev->if_flags & IF_READY)) {
2925 read_unlock(&idev->lock);
2926 goto out;
2927 }
2928
2929 spin_lock(&ifp->lock);
2930 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2931 spin_unlock(&ifp->lock);
2932 read_unlock(&idev->lock);
2933 goto out;
2934 }
2935
2936 if (ifp->probes == 0) {
2937 /*
2938 * DAD was successful
2939 */
2940
2941 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2942 spin_unlock(&ifp->lock);
2943 read_unlock(&idev->lock);
2944
2945 addrconf_dad_completed(ifp);
2946
2947 goto out;
2948 }
2949
2950 ifp->probes--;
2951 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2952 spin_unlock(&ifp->lock);
2953 read_unlock(&idev->lock);
2954
2955 /* send a neighbour solicitation for our addr */
2956 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2957 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2958out:
2959 in6_ifa_put(ifp);
2960}
2961
2962static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2963{
2964 struct net_device *dev = ifp->idev->dev;
2965
2966 /*
2967 * Configure the address for reception. Now it is valid.
2968 */
2969
2970 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2971
2972 /* If added prefix is link local and forwarding is off,
2973 start sending router solicitations.
2974 */
2975
2976 if ((ifp->idev->cnf.forwarding == 0 ||
2977 ifp->idev->cnf.forwarding == 2) &&
2978 ifp->idev->cnf.rtr_solicits > 0 &&
2979 (dev->flags&IFF_LOOPBACK) == 0 &&
2980 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2981 /*
2982 * If a host as already performed a random delay
2983 * [...] as part of DAD [...] there is no need
2984 * to delay again before sending the first RS
2985 */
2986 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2987
2988 spin_lock_bh(&ifp->lock);
2989 ifp->probes = 1;
2990 ifp->idev->if_flags |= IF_RS_SENT;
2991 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2992 spin_unlock_bh(&ifp->lock);
2993 }
2994}
2995
2996static void addrconf_dad_run(struct inet6_dev *idev)
2997{
2998 struct inet6_ifaddr *ifp;
2999
3000 read_lock_bh(&idev->lock);
3001 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3002 spin_lock(&ifp->lock);
3003 if (ifp->flags & IFA_F_TENTATIVE &&
3004 ifp->state == INET6_IFADDR_STATE_DAD)
3005 addrconf_dad_kick(ifp);
3006 spin_unlock(&ifp->lock);
3007 }
3008 read_unlock_bh(&idev->lock);
3009}
3010
3011#ifdef CONFIG_PROC_FS
3012struct if6_iter_state {
3013 struct seq_net_private p;
3014 int bucket;
3015};
3016
3017static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
3018{
3019 struct inet6_ifaddr *ifa = NULL;
3020 struct if6_iter_state *state = seq->private;
3021 struct net *net = seq_file_net(seq);
3022
3023 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3024 struct hlist_node *n;
3025 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3026 addr_lst)
3027 if (net_eq(dev_net(ifa->idev->dev), net))
3028 return ifa;
3029 }
3030 return NULL;
3031}
3032
3033static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3034 struct inet6_ifaddr *ifa)
3035{
3036 struct if6_iter_state *state = seq->private;
3037 struct net *net = seq_file_net(seq);
3038 struct hlist_node *n = &ifa->addr_lst;
3039
3040 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst)
3041 if (net_eq(dev_net(ifa->idev->dev), net))
3042 return ifa;
3043
3044 while (++state->bucket < IN6_ADDR_HSIZE) {
3045 hlist_for_each_entry_rcu_bh(ifa, n,
3046 &inet6_addr_lst[state->bucket], addr_lst) {
3047 if (net_eq(dev_net(ifa->idev->dev), net))
3048 return ifa;
3049 }
3050 }
3051
3052 return NULL;
3053}
3054
3055static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
3056{
3057 struct inet6_ifaddr *ifa = if6_get_first(seq);
3058
3059 if (ifa)
3060 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
3061 --pos;
3062 return pos ? NULL : ifa;
3063}
3064
3065static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3066 __acquires(rcu_bh)
3067{
3068 rcu_read_lock_bh();
3069 return if6_get_idx(seq, *pos);
3070}
3071
3072static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3073{
3074 struct inet6_ifaddr *ifa;
3075
3076 ifa = if6_get_next(seq, v);
3077 ++*pos;
3078 return ifa;
3079}
3080
3081static void if6_seq_stop(struct seq_file *seq, void *v)
3082 __releases(rcu_bh)
3083{
3084 rcu_read_unlock_bh();
3085}
3086
3087static int if6_seq_show(struct seq_file *seq, void *v)
3088{
3089 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3090 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3091 &ifp->addr,
3092 ifp->idev->dev->ifindex,
3093 ifp->prefix_len,
3094 ifp->scope,
3095 ifp->flags,
3096 ifp->idev->dev->name);
3097 return 0;
3098}
3099
3100static const struct seq_operations if6_seq_ops = {
3101 .start = if6_seq_start,
3102 .next = if6_seq_next,
3103 .show = if6_seq_show,
3104 .stop = if6_seq_stop,
3105};
3106
3107static int if6_seq_open(struct inode *inode, struct file *file)
3108{
3109 return seq_open_net(inode, file, &if6_seq_ops,
3110 sizeof(struct if6_iter_state));
3111}
3112
3113static const struct file_operations if6_fops = {
3114 .owner = THIS_MODULE,
3115 .open = if6_seq_open,
3116 .read = seq_read,
3117 .llseek = seq_lseek,
3118 .release = seq_release_net,
3119};
3120
3121static int __net_init if6_proc_net_init(struct net *net)
3122{
3123 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3124 return -ENOMEM;
3125 return 0;
3126}
3127
3128static void __net_exit if6_proc_net_exit(struct net *net)
3129{
3130 proc_net_remove(net, "if_inet6");
3131}
3132
3133static struct pernet_operations if6_proc_net_ops = {
3134 .init = if6_proc_net_init,
3135 .exit = if6_proc_net_exit,
3136};
3137
3138int __init if6_proc_init(void)
3139{
3140 return register_pernet_subsys(&if6_proc_net_ops);
3141}
3142
3143void if6_proc_exit(void)
3144{
3145 unregister_pernet_subsys(&if6_proc_net_ops);
3146}
3147#endif /* CONFIG_PROC_FS */
3148
3149#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3150/* Check if address is a home address configured on any interface. */
3151int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3152{
3153 int ret = 0;
3154 struct inet6_ifaddr *ifp = NULL;
3155 struct hlist_node *n;
3156 unsigned int hash = ipv6_addr_hash(addr);
3157
3158 rcu_read_lock_bh();
3159 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3160 if (!net_eq(dev_net(ifp->idev->dev), net))
3161 continue;
3162 if (ipv6_addr_equal(&ifp->addr, addr) &&
3163 (ifp->flags & IFA_F_HOMEADDRESS)) {
3164 ret = 1;
3165 break;
3166 }
3167 }
3168 rcu_read_unlock_bh();
3169 return ret;
3170}
3171#endif
3172
3173/*
3174 * Periodic address status verification
3175 */
3176
3177static void addrconf_verify(unsigned long foo)
3178{
3179 unsigned long now, next, next_sec, next_sched;
3180 struct inet6_ifaddr *ifp;
3181 struct hlist_node *node;
3182 int i;
3183
3184 rcu_read_lock_bh();
3185 spin_lock(&addrconf_verify_lock);
3186 now = jiffies;
3187 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3188
3189 del_timer(&addr_chk_timer);
3190
3191 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3192restart:
3193 hlist_for_each_entry_rcu_bh(ifp, node,
3194 &inet6_addr_lst[i], addr_lst) {
3195 unsigned long age;
3196
3197 if (ifp->flags & IFA_F_PERMANENT)
3198 continue;
3199
3200 spin_lock(&ifp->lock);
3201 /* We try to batch several events at once. */
3202 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3203
3204 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3205 age >= ifp->valid_lft) {
3206 spin_unlock(&ifp->lock);
3207 in6_ifa_hold(ifp);
3208 ipv6_del_addr(ifp);
3209 goto restart;
3210 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3211 spin_unlock(&ifp->lock);
3212 continue;
3213 } else if (age >= ifp->prefered_lft) {
3214 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3215 int deprecate = 0;
3216
3217 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3218 deprecate = 1;
3219 ifp->flags |= IFA_F_DEPRECATED;
3220 }
3221
3222 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3223 next = ifp->tstamp + ifp->valid_lft * HZ;
3224
3225 spin_unlock(&ifp->lock);
3226
3227 if (deprecate) {
3228 in6_ifa_hold(ifp);
3229
3230 ipv6_ifa_notify(0, ifp);
3231 in6_ifa_put(ifp);
3232 goto restart;
3233 }
3234#ifdef CONFIG_IPV6_PRIVACY
3235 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3236 !(ifp->flags&IFA_F_TENTATIVE)) {
3237 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3238 ifp->idev->cnf.dad_transmits *
3239 ifp->idev->nd_parms->retrans_time / HZ;
3240
3241 if (age >= ifp->prefered_lft - regen_advance) {
3242 struct inet6_ifaddr *ifpub = ifp->ifpub;
3243 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3244 next = ifp->tstamp + ifp->prefered_lft * HZ;
3245 if (!ifp->regen_count && ifpub) {
3246 ifp->regen_count++;
3247 in6_ifa_hold(ifp);
3248 in6_ifa_hold(ifpub);
3249 spin_unlock(&ifp->lock);
3250
3251 spin_lock(&ifpub->lock);
3252 ifpub->regen_count = 0;
3253 spin_unlock(&ifpub->lock);
3254 ipv6_create_tempaddr(ifpub, ifp);
3255 in6_ifa_put(ifpub);
3256 in6_ifa_put(ifp);
3257 goto restart;
3258 }
3259 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3260 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3261 spin_unlock(&ifp->lock);
3262#endif
3263 } else {
3264 /* ifp->prefered_lft <= ifp->valid_lft */
3265 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3266 next = ifp->tstamp + ifp->prefered_lft * HZ;
3267 spin_unlock(&ifp->lock);
3268 }
3269 }
3270 }
3271
3272 next_sec = round_jiffies_up(next);
3273 next_sched = next;
3274
3275 /* If rounded timeout is accurate enough, accept it. */
3276 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3277 next_sched = next_sec;
3278
3279 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3280 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3281 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3282
3283 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3284 now, next, next_sec, next_sched));
3285
3286 addr_chk_timer.expires = next_sched;
3287 add_timer(&addr_chk_timer);
3288 spin_unlock(&addrconf_verify_lock);
3289 rcu_read_unlock_bh();
3290}
3291
3292static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3293{
3294 struct in6_addr *pfx = NULL;
3295
3296 if (addr)
3297 pfx = nla_data(addr);
3298
3299 if (local) {
3300 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3301 pfx = NULL;
3302 else
3303 pfx = nla_data(local);
3304 }
3305
3306 return pfx;
3307}
3308
3309static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3310 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3311 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3312 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3313};
3314
3315static int
3316inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3317{
3318 struct net *net = sock_net(skb->sk);
3319 struct ifaddrmsg *ifm;
3320 struct nlattr *tb[IFA_MAX+1];
3321 struct in6_addr *pfx;
3322 int err;
3323
3324 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3325 if (err < 0)
3326 return err;
3327
3328 ifm = nlmsg_data(nlh);
3329 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3330 if (pfx == NULL)
3331 return -EINVAL;
3332
3333 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3334}
3335
3336static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3337 u32 prefered_lft, u32 valid_lft)
3338{
3339 u32 flags;
3340 clock_t expires;
3341 unsigned long timeout;
3342
3343 if (!valid_lft || (prefered_lft > valid_lft))
3344 return -EINVAL;
3345
3346 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3347 if (addrconf_finite_timeout(timeout)) {
3348 expires = jiffies_to_clock_t(timeout * HZ);
3349 valid_lft = timeout;
3350 flags = RTF_EXPIRES;
3351 } else {
3352 expires = 0;
3353 flags = 0;
3354 ifa_flags |= IFA_F_PERMANENT;
3355 }
3356
3357 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3358 if (addrconf_finite_timeout(timeout)) {
3359 if (timeout == 0)
3360 ifa_flags |= IFA_F_DEPRECATED;
3361 prefered_lft = timeout;
3362 }
3363
3364 spin_lock_bh(&ifp->lock);
3365 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3366 ifp->tstamp = jiffies;
3367 ifp->valid_lft = valid_lft;
3368 ifp->prefered_lft = prefered_lft;
3369
3370 spin_unlock_bh(&ifp->lock);
3371 if (!(ifp->flags&IFA_F_TENTATIVE))
3372 ipv6_ifa_notify(0, ifp);
3373
3374 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3375 expires, flags);
3376 addrconf_verify(0);
3377
3378 return 0;
3379}
3380
3381static int
3382inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3383{
3384 struct net *net = sock_net(skb->sk);
3385 struct ifaddrmsg *ifm;
3386 struct nlattr *tb[IFA_MAX+1];
3387 struct in6_addr *pfx;
3388 struct inet6_ifaddr *ifa;
3389 struct net_device *dev;
3390 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3391 u8 ifa_flags;
3392 int err;
3393
3394 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3395 if (err < 0)
3396 return err;
3397
3398 ifm = nlmsg_data(nlh);
3399 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3400 if (pfx == NULL)
3401 return -EINVAL;
3402
3403 if (tb[IFA_CACHEINFO]) {
3404 struct ifa_cacheinfo *ci;
3405
3406 ci = nla_data(tb[IFA_CACHEINFO]);
3407 valid_lft = ci->ifa_valid;
3408 preferred_lft = ci->ifa_prefered;
3409 } else {
3410 preferred_lft = INFINITY_LIFE_TIME;
3411 valid_lft = INFINITY_LIFE_TIME;
3412 }
3413
3414 dev = __dev_get_by_index(net, ifm->ifa_index);
3415 if (dev == NULL)
3416 return -ENODEV;
3417
3418 /* We ignore other flags so far. */
3419 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3420
3421 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3422 if (ifa == NULL) {
3423 /*
3424 * It would be best to check for !NLM_F_CREATE here but
3425 * userspace alreay relies on not having to provide this.
3426 */
3427 return inet6_addr_add(net, ifm->ifa_index, pfx,
3428 ifm->ifa_prefixlen, ifa_flags,
3429 preferred_lft, valid_lft);
3430 }
3431
3432 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3433 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3434 err = -EEXIST;
3435 else
3436 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3437
3438 in6_ifa_put(ifa);
3439
3440 return err;
3441}
3442
3443static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3444 u8 scope, int ifindex)
3445{
3446 struct ifaddrmsg *ifm;
3447
3448 ifm = nlmsg_data(nlh);
3449 ifm->ifa_family = AF_INET6;
3450 ifm->ifa_prefixlen = prefixlen;
3451 ifm->ifa_flags = flags;
3452 ifm->ifa_scope = scope;
3453 ifm->ifa_index = ifindex;
3454}
3455
3456static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3457 unsigned long tstamp, u32 preferred, u32 valid)
3458{
3459 struct ifa_cacheinfo ci;
3460
3461 ci.cstamp = cstamp_delta(cstamp);
3462 ci.tstamp = cstamp_delta(tstamp);
3463 ci.ifa_prefered = preferred;
3464 ci.ifa_valid = valid;
3465
3466 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3467}
3468
3469static inline int rt_scope(int ifa_scope)
3470{
3471 if (ifa_scope & IFA_HOST)
3472 return RT_SCOPE_HOST;
3473 else if (ifa_scope & IFA_LINK)
3474 return RT_SCOPE_LINK;
3475 else if (ifa_scope & IFA_SITE)
3476 return RT_SCOPE_SITE;
3477 else
3478 return RT_SCOPE_UNIVERSE;
3479}
3480
3481static inline int inet6_ifaddr_msgsize(void)
3482{
3483 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3484 + nla_total_size(16) /* IFA_ADDRESS */
3485 + nla_total_size(sizeof(struct ifa_cacheinfo));
3486}
3487
3488static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3489 u32 pid, u32 seq, int event, unsigned int flags)
3490{
3491 struct nlmsghdr *nlh;
3492 u32 preferred, valid;
3493
3494 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3495 if (nlh == NULL)
3496 return -EMSGSIZE;
3497
3498 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3499 ifa->idev->dev->ifindex);
3500
3501 if (!(ifa->flags&IFA_F_PERMANENT)) {
3502 preferred = ifa->prefered_lft;
3503 valid = ifa->valid_lft;
3504 if (preferred != INFINITY_LIFE_TIME) {
3505 long tval = (jiffies - ifa->tstamp)/HZ;
3506 if (preferred > tval)
3507 preferred -= tval;
3508 else
3509 preferred = 0;
3510 if (valid != INFINITY_LIFE_TIME) {
3511 if (valid > tval)
3512 valid -= tval;
3513 else
3514 valid = 0;
3515 }
3516 }
3517 } else {
3518 preferred = INFINITY_LIFE_TIME;
3519 valid = INFINITY_LIFE_TIME;
3520 }
3521
3522 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3523 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3524 nlmsg_cancel(skb, nlh);
3525 return -EMSGSIZE;
3526 }
3527
3528 return nlmsg_end(skb, nlh);
3529}
3530
3531static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3532 u32 pid, u32 seq, int event, u16 flags)
3533{
3534 struct nlmsghdr *nlh;
3535 u8 scope = RT_SCOPE_UNIVERSE;
3536 int ifindex = ifmca->idev->dev->ifindex;
3537
3538 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3539 scope = RT_SCOPE_SITE;
3540
3541 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3542 if (nlh == NULL)
3543 return -EMSGSIZE;
3544
3545 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3546 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3547 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3548 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3549 nlmsg_cancel(skb, nlh);
3550 return -EMSGSIZE;
3551 }
3552
3553 return nlmsg_end(skb, nlh);
3554}
3555
3556static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3557 u32 pid, u32 seq, int event, unsigned int flags)
3558{
3559 struct nlmsghdr *nlh;
3560 u8 scope = RT_SCOPE_UNIVERSE;
3561 int ifindex = ifaca->aca_idev->dev->ifindex;
3562
3563 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3564 scope = RT_SCOPE_SITE;
3565
3566 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3567 if (nlh == NULL)
3568 return -EMSGSIZE;
3569
3570 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3571 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3572 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3573 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3574 nlmsg_cancel(skb, nlh);
3575 return -EMSGSIZE;
3576 }
3577
3578 return nlmsg_end(skb, nlh);
3579}
3580
3581enum addr_type_t {
3582 UNICAST_ADDR,
3583 MULTICAST_ADDR,
3584 ANYCAST_ADDR,
3585};
3586
3587/* called with rcu_read_lock() */
3588static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3589 struct netlink_callback *cb, enum addr_type_t type,
3590 int s_ip_idx, int *p_ip_idx)
3591{
3592 struct ifmcaddr6 *ifmca;
3593 struct ifacaddr6 *ifaca;
3594 int err = 1;
3595 int ip_idx = *p_ip_idx;
3596
3597 read_lock_bh(&idev->lock);
3598 switch (type) {
3599 case UNICAST_ADDR: {
3600 struct inet6_ifaddr *ifa;
3601
3602 /* unicast address incl. temp addr */
3603 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3604 if (++ip_idx < s_ip_idx)
3605 continue;
3606 err = inet6_fill_ifaddr(skb, ifa,
3607 NETLINK_CB(cb->skb).pid,
3608 cb->nlh->nlmsg_seq,
3609 RTM_NEWADDR,
3610 NLM_F_MULTI);
3611 if (err <= 0)
3612 break;
3613 }
3614 break;
3615 }
3616 case MULTICAST_ADDR:
3617 /* multicast address */
3618 for (ifmca = idev->mc_list; ifmca;
3619 ifmca = ifmca->next, ip_idx++) {
3620 if (ip_idx < s_ip_idx)
3621 continue;
3622 err = inet6_fill_ifmcaddr(skb, ifmca,
3623 NETLINK_CB(cb->skb).pid,
3624 cb->nlh->nlmsg_seq,
3625 RTM_GETMULTICAST,
3626 NLM_F_MULTI);
3627 if (err <= 0)
3628 break;
3629 }
3630 break;
3631 case ANYCAST_ADDR:
3632 /* anycast address */
3633 for (ifaca = idev->ac_list; ifaca;
3634 ifaca = ifaca->aca_next, ip_idx++) {
3635 if (ip_idx < s_ip_idx)
3636 continue;
3637 err = inet6_fill_ifacaddr(skb, ifaca,
3638 NETLINK_CB(cb->skb).pid,
3639 cb->nlh->nlmsg_seq,
3640 RTM_GETANYCAST,
3641 NLM_F_MULTI);
3642 if (err <= 0)
3643 break;
3644 }
3645 break;
3646 default:
3647 break;
3648 }
3649 read_unlock_bh(&idev->lock);
3650 *p_ip_idx = ip_idx;
3651 return err;
3652}
3653
3654static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3655 enum addr_type_t type)
3656{
3657 struct net *net = sock_net(skb->sk);
3658 int h, s_h;
3659 int idx, ip_idx;
3660 int s_idx, s_ip_idx;
3661 struct net_device *dev;
3662 struct inet6_dev *idev;
3663 struct hlist_head *head;
3664 struct hlist_node *node;
3665
3666 s_h = cb->args[0];
3667 s_idx = idx = cb->args[1];
3668 s_ip_idx = ip_idx = cb->args[2];
3669
3670 rcu_read_lock();
3671 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3672 idx = 0;
3673 head = &net->dev_index_head[h];
3674 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3675 if (idx < s_idx)
3676 goto cont;
3677 if (h > s_h || idx > s_idx)
3678 s_ip_idx = 0;
3679 ip_idx = 0;
3680 idev = __in6_dev_get(dev);
3681 if (!idev)
3682 goto cont;
3683
3684 if (in6_dump_addrs(idev, skb, cb, type,
3685 s_ip_idx, &ip_idx) <= 0)
3686 goto done;
3687cont:
3688 idx++;
3689 }
3690 }
3691done:
3692 rcu_read_unlock();
3693 cb->args[0] = h;
3694 cb->args[1] = idx;
3695 cb->args[2] = ip_idx;
3696
3697 return skb->len;
3698}
3699
3700static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3701{
3702 enum addr_type_t type = UNICAST_ADDR;
3703
3704 return inet6_dump_addr(skb, cb, type);
3705}
3706
3707static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3708{
3709 enum addr_type_t type = MULTICAST_ADDR;
3710
3711 return inet6_dump_addr(skb, cb, type);
3712}
3713
3714
3715static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3716{
3717 enum addr_type_t type = ANYCAST_ADDR;
3718
3719 return inet6_dump_addr(skb, cb, type);
3720}
3721
3722static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3723 void *arg)
3724{
3725 struct net *net = sock_net(in_skb->sk);
3726 struct ifaddrmsg *ifm;
3727 struct nlattr *tb[IFA_MAX+1];
3728 struct in6_addr *addr = NULL;
3729 struct net_device *dev = NULL;
3730 struct inet6_ifaddr *ifa;
3731 struct sk_buff *skb;
3732 int err;
3733
3734 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3735 if (err < 0)
3736 goto errout;
3737
3738 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3739 if (addr == NULL) {
3740 err = -EINVAL;
3741 goto errout;
3742 }
3743
3744 ifm = nlmsg_data(nlh);
3745 if (ifm->ifa_index)
3746 dev = __dev_get_by_index(net, ifm->ifa_index);
3747
3748 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3749 if (!ifa) {
3750 err = -EADDRNOTAVAIL;
3751 goto errout;
3752 }
3753
3754 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3755 if (!skb) {
3756 err = -ENOBUFS;
3757 goto errout_ifa;
3758 }
3759
3760 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3761 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3762 if (err < 0) {
3763 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3764 WARN_ON(err == -EMSGSIZE);
3765 kfree_skb(skb);
3766 goto errout_ifa;
3767 }
3768 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3769errout_ifa:
3770 in6_ifa_put(ifa);
3771errout:
3772 return err;
3773}
3774
3775static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3776{
3777 struct sk_buff *skb;
3778 struct net *net = dev_net(ifa->idev->dev);
3779 int err = -ENOBUFS;
3780
3781 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3782 if (skb == NULL)
3783 goto errout;
3784
3785 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3786 if (err < 0) {
3787 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3788 WARN_ON(err == -EMSGSIZE);
3789 kfree_skb(skb);
3790 goto errout;
3791 }
3792 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3793 return;
3794errout:
3795 if (err < 0)
3796 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3797}
3798
3799static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3800 __s32 *array, int bytes)
3801{
3802 BUG_ON(bytes < (DEVCONF_MAX * 4));
3803
3804 memset(array, 0, bytes);
3805 array[DEVCONF_FORWARDING] = cnf->forwarding;
3806 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3807 array[DEVCONF_MTU6] = cnf->mtu6;
3808 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3809 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3810 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3811 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3812 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3813 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3814 jiffies_to_msecs(cnf->rtr_solicit_interval);
3815 array[DEVCONF_RTR_SOLICIT_DELAY] =
3816 jiffies_to_msecs(cnf->rtr_solicit_delay);
3817 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3818#ifdef CONFIG_IPV6_PRIVACY
3819 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3820 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3821 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3822 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3823 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3824#endif
3825 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3826 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3827 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3828#ifdef CONFIG_IPV6_ROUTER_PREF
3829 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3830 array[DEVCONF_RTR_PROBE_INTERVAL] =
3831 jiffies_to_msecs(cnf->rtr_probe_interval);
3832#ifdef CONFIG_IPV6_ROUTE_INFO
3833 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3834#endif
3835#endif
3836 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3837 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3838#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3839 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3840#endif
3841#ifdef CONFIG_IPV6_MROUTE
3842 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3843#endif
3844 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3845 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3846 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3847}
3848
3849static inline size_t inet6_ifla6_size(void)
3850{
3851 return nla_total_size(4) /* IFLA_INET6_FLAGS */
3852 + nla_total_size(sizeof(struct ifla_cacheinfo))
3853 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3854 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3855 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3856}
3857
3858static inline size_t inet6_if_nlmsg_size(void)
3859{
3860 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3861 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3862 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3863 + nla_total_size(4) /* IFLA_MTU */
3864 + nla_total_size(4) /* IFLA_LINK */
3865 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3866}
3867
3868static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3869 int items, int bytes)
3870{
3871 int i;
3872 int pad = bytes - sizeof(u64) * items;
3873 BUG_ON(pad < 0);
3874
3875 /* Use put_unaligned() because stats may not be aligned for u64. */
3876 put_unaligned(items, &stats[0]);
3877 for (i = 1; i < items; i++)
3878 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3879
3880 memset(&stats[items], 0, pad);
3881}
3882
3883static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3884 int items, int bytes, size_t syncpoff)
3885{
3886 int i;
3887 int pad = bytes - sizeof(u64) * items;
3888 BUG_ON(pad < 0);
3889
3890 /* Use put_unaligned() because stats may not be aligned for u64. */
3891 put_unaligned(items, &stats[0]);
3892 for (i = 1; i < items; i++)
3893 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3894
3895 memset(&stats[items], 0, pad);
3896}
3897
3898static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3899 int bytes)
3900{
3901 switch (attrtype) {
3902 case IFLA_INET6_STATS:
3903 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3904 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3905 break;
3906 case IFLA_INET6_ICMP6STATS:
3907 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3908 break;
3909 }
3910}
3911
3912static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3913{
3914 struct nlattr *nla;
3915 struct ifla_cacheinfo ci;
3916
3917 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3918
3919 ci.max_reasm_len = IPV6_MAXPLEN;
3920 ci.tstamp = cstamp_delta(idev->tstamp);
3921 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3922 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3923 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3924
3925 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3926 if (nla == NULL)
3927 goto nla_put_failure;
3928 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3929
3930 /* XXX - MC not implemented */
3931
3932 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3933 if (nla == NULL)
3934 goto nla_put_failure;
3935 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3936
3937 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3938 if (nla == NULL)
3939 goto nla_put_failure;
3940 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3941
3942 return 0;
3943
3944nla_put_failure:
3945 return -EMSGSIZE;
3946}
3947
3948static size_t inet6_get_link_af_size(const struct net_device *dev)
3949{
3950 if (!__in6_dev_get(dev))
3951 return 0;
3952
3953 return inet6_ifla6_size();
3954}
3955
3956static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
3957{
3958 struct inet6_dev *idev = __in6_dev_get(dev);
3959
3960 if (!idev)
3961 return -ENODATA;
3962
3963 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
3964 return -EMSGSIZE;
3965
3966 return 0;
3967}
3968
3969static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3970 u32 pid, u32 seq, int event, unsigned int flags)
3971{
3972 struct net_device *dev = idev->dev;
3973 struct ifinfomsg *hdr;
3974 struct nlmsghdr *nlh;
3975 void *protoinfo;
3976
3977 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3978 if (nlh == NULL)
3979 return -EMSGSIZE;
3980
3981 hdr = nlmsg_data(nlh);
3982 hdr->ifi_family = AF_INET6;
3983 hdr->__ifi_pad = 0;
3984 hdr->ifi_type = dev->type;
3985 hdr->ifi_index = dev->ifindex;
3986 hdr->ifi_flags = dev_get_flags(dev);
3987 hdr->ifi_change = 0;
3988
3989 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3990
3991 if (dev->addr_len)
3992 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3993
3994 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3995 if (dev->ifindex != dev->iflink)
3996 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3997
3998 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3999 if (protoinfo == NULL)
4000 goto nla_put_failure;
4001
4002 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4003 goto nla_put_failure;
4004
4005 nla_nest_end(skb, protoinfo);
4006 return nlmsg_end(skb, nlh);
4007
4008nla_put_failure:
4009 nlmsg_cancel(skb, nlh);
4010 return -EMSGSIZE;
4011}
4012
4013static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4014{
4015 struct net *net = sock_net(skb->sk);
4016 int h, s_h;
4017 int idx = 0, s_idx;
4018 struct net_device *dev;
4019 struct inet6_dev *idev;
4020 struct hlist_head *head;
4021 struct hlist_node *node;
4022
4023 s_h = cb->args[0];
4024 s_idx = cb->args[1];
4025
4026 rcu_read_lock();
4027 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4028 idx = 0;
4029 head = &net->dev_index_head[h];
4030 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4031 if (idx < s_idx)
4032 goto cont;
4033 idev = __in6_dev_get(dev);
4034 if (!idev)
4035 goto cont;
4036 if (inet6_fill_ifinfo(skb, idev,
4037 NETLINK_CB(cb->skb).pid,
4038 cb->nlh->nlmsg_seq,
4039 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4040 goto out;
4041cont:
4042 idx++;
4043 }
4044 }
4045out:
4046 rcu_read_unlock();
4047 cb->args[1] = idx;
4048 cb->args[0] = h;
4049
4050 return skb->len;
4051}
4052
4053void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4054{
4055 struct sk_buff *skb;
4056 struct net *net = dev_net(idev->dev);
4057 int err = -ENOBUFS;
4058
4059 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4060 if (skb == NULL)
4061 goto errout;
4062
4063 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4064 if (err < 0) {
4065 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4066 WARN_ON(err == -EMSGSIZE);
4067 kfree_skb(skb);
4068 goto errout;
4069 }
4070 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4071 return;
4072errout:
4073 if (err < 0)
4074 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4075}
4076
4077static inline size_t inet6_prefix_nlmsg_size(void)
4078{
4079 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4080 + nla_total_size(sizeof(struct in6_addr))
4081 + nla_total_size(sizeof(struct prefix_cacheinfo));
4082}
4083
4084static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4085 struct prefix_info *pinfo, u32 pid, u32 seq,
4086 int event, unsigned int flags)
4087{
4088 struct prefixmsg *pmsg;
4089 struct nlmsghdr *nlh;
4090 struct prefix_cacheinfo ci;
4091
4092 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
4093 if (nlh == NULL)
4094 return -EMSGSIZE;
4095
4096 pmsg = nlmsg_data(nlh);
4097 pmsg->prefix_family = AF_INET6;
4098 pmsg->prefix_pad1 = 0;
4099 pmsg->prefix_pad2 = 0;
4100 pmsg->prefix_ifindex = idev->dev->ifindex;
4101 pmsg->prefix_len = pinfo->prefix_len;
4102 pmsg->prefix_type = pinfo->type;
4103 pmsg->prefix_pad3 = 0;
4104 pmsg->prefix_flags = 0;
4105 if (pinfo->onlink)
4106 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4107 if (pinfo->autoconf)
4108 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4109
4110 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
4111
4112 ci.preferred_time = ntohl(pinfo->prefered);
4113 ci.valid_time = ntohl(pinfo->valid);
4114 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
4115
4116 return nlmsg_end(skb, nlh);
4117
4118nla_put_failure:
4119 nlmsg_cancel(skb, nlh);
4120 return -EMSGSIZE;
4121}
4122
4123static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4124 struct prefix_info *pinfo)
4125{
4126 struct sk_buff *skb;
4127 struct net *net = dev_net(idev->dev);
4128 int err = -ENOBUFS;
4129
4130 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4131 if (skb == NULL)
4132 goto errout;
4133
4134 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4135 if (err < 0) {
4136 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4137 WARN_ON(err == -EMSGSIZE);
4138 kfree_skb(skb);
4139 goto errout;
4140 }
4141 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4142 return;
4143errout:
4144 if (err < 0)
4145 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4146}
4147
4148static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4149{
4150 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4151
4152 switch (event) {
4153 case RTM_NEWADDR:
4154 /*
4155 * If the address was optimistic
4156 * we inserted the route at the start of
4157 * our DAD process, so we don't need
4158 * to do it again
4159 */
4160 if (!(ifp->rt->rt6i_node))
4161 ip6_ins_rt(ifp->rt);
4162 if (ifp->idev->cnf.forwarding)
4163 addrconf_join_anycast(ifp);
4164 break;
4165 case RTM_DELADDR:
4166 if (ifp->idev->cnf.forwarding)
4167 addrconf_leave_anycast(ifp);
4168 addrconf_leave_solict(ifp->idev, &ifp->addr);
4169 dst_hold(&ifp->rt->dst);
4170
4171 if (ip6_del_rt(ifp->rt))
4172 dst_free(&ifp->rt->dst);
4173 break;
4174 }
4175}
4176
4177static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4178{
4179 rcu_read_lock_bh();
4180 if (likely(ifp->idev->dead == 0))
4181 __ipv6_ifa_notify(event, ifp);
4182 rcu_read_unlock_bh();
4183}
4184
4185#ifdef CONFIG_SYSCTL
4186
4187static
4188int addrconf_sysctl_forward(ctl_table *ctl, int write,
4189 void __user *buffer, size_t *lenp, loff_t *ppos)
4190{
4191 int *valp = ctl->data;
4192 int val = *valp;
4193 loff_t pos = *ppos;
4194 int ret;
4195
4196 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4197
4198 if (write)
4199 ret = addrconf_fixup_forwarding(ctl, valp, val);
4200 if (ret)
4201 *ppos = pos;
4202 return ret;
4203}
4204
4205static void dev_disable_change(struct inet6_dev *idev)
4206{
4207 if (!idev || !idev->dev)
4208 return;
4209
4210 if (idev->cnf.disable_ipv6)
4211 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4212 else
4213 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4214}
4215
4216static void addrconf_disable_change(struct net *net, __s32 newf)
4217{
4218 struct net_device *dev;
4219 struct inet6_dev *idev;
4220
4221 rcu_read_lock();
4222 for_each_netdev_rcu(net, dev) {
4223 idev = __in6_dev_get(dev);
4224 if (idev) {
4225 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4226 idev->cnf.disable_ipv6 = newf;
4227 if (changed)
4228 dev_disable_change(idev);
4229 }
4230 }
4231 rcu_read_unlock();
4232}
4233
4234static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4235{
4236 struct net *net;
4237
4238 net = (struct net *)table->extra2;
4239
4240 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4241 return 0;
4242
4243 if (!rtnl_trylock()) {
4244 /* Restore the original values before restarting */
4245 *p = old;
4246 return restart_syscall();
4247 }
4248
4249 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4250 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4251 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4252 addrconf_disable_change(net, newf);
4253 } else if ((!*p) ^ (!old))
4254 dev_disable_change((struct inet6_dev *)table->extra1);
4255
4256 rtnl_unlock();
4257 return 0;
4258}
4259
4260static
4261int addrconf_sysctl_disable(ctl_table *ctl, int write,
4262 void __user *buffer, size_t *lenp, loff_t *ppos)
4263{
4264 int *valp = ctl->data;
4265 int val = *valp;
4266 loff_t pos = *ppos;
4267 int ret;
4268
4269 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4270
4271 if (write)
4272 ret = addrconf_disable_ipv6(ctl, valp, val);
4273 if (ret)
4274 *ppos = pos;
4275 return ret;
4276}
4277
4278static struct addrconf_sysctl_table
4279{
4280 struct ctl_table_header *sysctl_header;
4281 ctl_table addrconf_vars[DEVCONF_MAX+1];
4282 char *dev_name;
4283} addrconf_sysctl __read_mostly = {
4284 .sysctl_header = NULL,
4285 .addrconf_vars = {
4286 {
4287 .procname = "forwarding",
4288 .data = &ipv6_devconf.forwarding,
4289 .maxlen = sizeof(int),
4290 .mode = 0644,
4291 .proc_handler = addrconf_sysctl_forward,
4292 },
4293 {
4294 .procname = "hop_limit",
4295 .data = &ipv6_devconf.hop_limit,
4296 .maxlen = sizeof(int),
4297 .mode = 0644,
4298 .proc_handler = proc_dointvec,
4299 },
4300 {
4301 .procname = "mtu",
4302 .data = &ipv6_devconf.mtu6,
4303 .maxlen = sizeof(int),
4304 .mode = 0644,
4305 .proc_handler = proc_dointvec,
4306 },
4307 {
4308 .procname = "accept_ra",
4309 .data = &ipv6_devconf.accept_ra,
4310 .maxlen = sizeof(int),
4311 .mode = 0644,
4312 .proc_handler = proc_dointvec,
4313 },
4314 {
4315 .procname = "accept_redirects",
4316 .data = &ipv6_devconf.accept_redirects,
4317 .maxlen = sizeof(int),
4318 .mode = 0644,
4319 .proc_handler = proc_dointvec,
4320 },
4321 {
4322 .procname = "autoconf",
4323 .data = &ipv6_devconf.autoconf,
4324 .maxlen = sizeof(int),
4325 .mode = 0644,
4326 .proc_handler = proc_dointvec,
4327 },
4328 {
4329 .procname = "dad_transmits",
4330 .data = &ipv6_devconf.dad_transmits,
4331 .maxlen = sizeof(int),
4332 .mode = 0644,
4333 .proc_handler = proc_dointvec,
4334 },
4335 {
4336 .procname = "router_solicitations",
4337 .data = &ipv6_devconf.rtr_solicits,
4338 .maxlen = sizeof(int),
4339 .mode = 0644,
4340 .proc_handler = proc_dointvec,
4341 },
4342 {
4343 .procname = "router_solicitation_interval",
4344 .data = &ipv6_devconf.rtr_solicit_interval,
4345 .maxlen = sizeof(int),
4346 .mode = 0644,
4347 .proc_handler = proc_dointvec_jiffies,
4348 },
4349 {
4350 .procname = "router_solicitation_delay",
4351 .data = &ipv6_devconf.rtr_solicit_delay,
4352 .maxlen = sizeof(int),
4353 .mode = 0644,
4354 .proc_handler = proc_dointvec_jiffies,
4355 },
4356 {
4357 .procname = "force_mld_version",
4358 .data = &ipv6_devconf.force_mld_version,
4359 .maxlen = sizeof(int),
4360 .mode = 0644,
4361 .proc_handler = proc_dointvec,
4362 },
4363#ifdef CONFIG_IPV6_PRIVACY
4364 {
4365 .procname = "use_tempaddr",
4366 .data = &ipv6_devconf.use_tempaddr,
4367 .maxlen = sizeof(int),
4368 .mode = 0644,
4369 .proc_handler = proc_dointvec,
4370 },
4371 {
4372 .procname = "temp_valid_lft",
4373 .data = &ipv6_devconf.temp_valid_lft,
4374 .maxlen = sizeof(int),
4375 .mode = 0644,
4376 .proc_handler = proc_dointvec,
4377 },
4378 {
4379 .procname = "temp_prefered_lft",
4380 .data = &ipv6_devconf.temp_prefered_lft,
4381 .maxlen = sizeof(int),
4382 .mode = 0644,
4383 .proc_handler = proc_dointvec,
4384 },
4385 {
4386 .procname = "regen_max_retry",
4387 .data = &ipv6_devconf.regen_max_retry,
4388 .maxlen = sizeof(int),
4389 .mode = 0644,
4390 .proc_handler = proc_dointvec,
4391 },
4392 {
4393 .procname = "max_desync_factor",
4394 .data = &ipv6_devconf.max_desync_factor,
4395 .maxlen = sizeof(int),
4396 .mode = 0644,
4397 .proc_handler = proc_dointvec,
4398 },
4399#endif
4400 {
4401 .procname = "max_addresses",
4402 .data = &ipv6_devconf.max_addresses,
4403 .maxlen = sizeof(int),
4404 .mode = 0644,
4405 .proc_handler = proc_dointvec,
4406 },
4407 {
4408 .procname = "accept_ra_defrtr",
4409 .data = &ipv6_devconf.accept_ra_defrtr,
4410 .maxlen = sizeof(int),
4411 .mode = 0644,
4412 .proc_handler = proc_dointvec,
4413 },
4414 {
4415 .procname = "accept_ra_pinfo",
4416 .data = &ipv6_devconf.accept_ra_pinfo,
4417 .maxlen = sizeof(int),
4418 .mode = 0644,
4419 .proc_handler = proc_dointvec,
4420 },
4421#ifdef CONFIG_IPV6_ROUTER_PREF
4422 {
4423 .procname = "accept_ra_rtr_pref",
4424 .data = &ipv6_devconf.accept_ra_rtr_pref,
4425 .maxlen = sizeof(int),
4426 .mode = 0644,
4427 .proc_handler = proc_dointvec,
4428 },
4429 {
4430 .procname = "router_probe_interval",
4431 .data = &ipv6_devconf.rtr_probe_interval,
4432 .maxlen = sizeof(int),
4433 .mode = 0644,
4434 .proc_handler = proc_dointvec_jiffies,
4435 },
4436#ifdef CONFIG_IPV6_ROUTE_INFO
4437 {
4438 .procname = "accept_ra_rt_info_max_plen",
4439 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4440 .maxlen = sizeof(int),
4441 .mode = 0644,
4442 .proc_handler = proc_dointvec,
4443 },
4444#endif
4445#endif
4446 {
4447 .procname = "proxy_ndp",
4448 .data = &ipv6_devconf.proxy_ndp,
4449 .maxlen = sizeof(int),
4450 .mode = 0644,
4451 .proc_handler = proc_dointvec,
4452 },
4453 {
4454 .procname = "accept_source_route",
4455 .data = &ipv6_devconf.accept_source_route,
4456 .maxlen = sizeof(int),
4457 .mode = 0644,
4458 .proc_handler = proc_dointvec,
4459 },
4460#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4461 {
4462 .procname = "optimistic_dad",
4463 .data = &ipv6_devconf.optimistic_dad,
4464 .maxlen = sizeof(int),
4465 .mode = 0644,
4466 .proc_handler = proc_dointvec,
4467
4468 },
4469#endif
4470#ifdef CONFIG_IPV6_MROUTE
4471 {
4472 .procname = "mc_forwarding",
4473 .data = &ipv6_devconf.mc_forwarding,
4474 .maxlen = sizeof(int),
4475 .mode = 0444,
4476 .proc_handler = proc_dointvec,
4477 },
4478#endif
4479 {
4480 .procname = "disable_ipv6",
4481 .data = &ipv6_devconf.disable_ipv6,
4482 .maxlen = sizeof(int),
4483 .mode = 0644,
4484 .proc_handler = addrconf_sysctl_disable,
4485 },
4486 {
4487 .procname = "accept_dad",
4488 .data = &ipv6_devconf.accept_dad,
4489 .maxlen = sizeof(int),
4490 .mode = 0644,
4491 .proc_handler = proc_dointvec,
4492 },
4493 {
4494 .procname = "force_tllao",
4495 .data = &ipv6_devconf.force_tllao,
4496 .maxlen = sizeof(int),
4497 .mode = 0644,
4498 .proc_handler = proc_dointvec
4499 },
4500 {
4501 /* sentinel */
4502 }
4503 },
4504};
4505
4506static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4507 struct inet6_dev *idev, struct ipv6_devconf *p)
4508{
4509 int i;
4510 struct addrconf_sysctl_table *t;
4511
4512#define ADDRCONF_CTL_PATH_DEV 3
4513
4514 struct ctl_path addrconf_ctl_path[] = {
4515 { .procname = "net", },
4516 { .procname = "ipv6", },
4517 { .procname = "conf", },
4518 { /* to be set */ },
4519 { },
4520 };
4521
4522
4523 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4524 if (t == NULL)
4525 goto out;
4526
4527 for (i = 0; t->addrconf_vars[i].data; i++) {
4528 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4529 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4530 t->addrconf_vars[i].extra2 = net;
4531 }
4532
4533 /*
4534 * Make a copy of dev_name, because '.procname' is regarded as const
4535 * by sysctl and we wouldn't want anyone to change it under our feet
4536 * (see SIOCSIFNAME).
4537 */
4538 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4539 if (!t->dev_name)
4540 goto free;
4541
4542 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4543
4544 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4545 t->addrconf_vars);
4546 if (t->sysctl_header == NULL)
4547 goto free_procname;
4548
4549 p->sysctl = t;
4550 return 0;
4551
4552free_procname:
4553 kfree(t->dev_name);
4554free:
4555 kfree(t);
4556out:
4557 return -ENOBUFS;
4558}
4559
4560static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4561{
4562 struct addrconf_sysctl_table *t;
4563
4564 if (p->sysctl == NULL)
4565 return;
4566
4567 t = p->sysctl;
4568 p->sysctl = NULL;
4569 unregister_net_sysctl_table(t->sysctl_header);
4570 kfree(t->dev_name);
4571 kfree(t);
4572}
4573
4574static void addrconf_sysctl_register(struct inet6_dev *idev)
4575{
4576 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4577 &ndisc_ifinfo_sysctl_change);
4578 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4579 idev, &idev->cnf);
4580}
4581
4582static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4583{
4584 __addrconf_sysctl_unregister(&idev->cnf);
4585 neigh_sysctl_unregister(idev->nd_parms);
4586}
4587
4588
4589#endif
4590
4591static int __net_init addrconf_init_net(struct net *net)
4592{
4593 int err;
4594 struct ipv6_devconf *all, *dflt;
4595
4596 err = -ENOMEM;
4597 all = &ipv6_devconf;
4598 dflt = &ipv6_devconf_dflt;
4599
4600 if (!net_eq(net, &init_net)) {
4601 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4602 if (all == NULL)
4603 goto err_alloc_all;
4604
4605 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4606 if (dflt == NULL)
4607 goto err_alloc_dflt;
4608 } else {
4609 /* these will be inherited by all namespaces */
4610 dflt->autoconf = ipv6_defaults.autoconf;
4611 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4612 }
4613
4614 net->ipv6.devconf_all = all;
4615 net->ipv6.devconf_dflt = dflt;
4616
4617#ifdef CONFIG_SYSCTL
4618 err = __addrconf_sysctl_register(net, "all", NULL, all);
4619 if (err < 0)
4620 goto err_reg_all;
4621
4622 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4623 if (err < 0)
4624 goto err_reg_dflt;
4625#endif
4626 return 0;
4627
4628#ifdef CONFIG_SYSCTL
4629err_reg_dflt:
4630 __addrconf_sysctl_unregister(all);
4631err_reg_all:
4632 kfree(dflt);
4633#endif
4634err_alloc_dflt:
4635 kfree(all);
4636err_alloc_all:
4637 return err;
4638}
4639
4640static void __net_exit addrconf_exit_net(struct net *net)
4641{
4642#ifdef CONFIG_SYSCTL
4643 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4644 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4645#endif
4646 if (!net_eq(net, &init_net)) {
4647 kfree(net->ipv6.devconf_dflt);
4648 kfree(net->ipv6.devconf_all);
4649 }
4650}
4651
4652static struct pernet_operations addrconf_ops = {
4653 .init = addrconf_init_net,
4654 .exit = addrconf_exit_net,
4655};
4656
4657/*
4658 * Device notifier
4659 */
4660
4661int register_inet6addr_notifier(struct notifier_block *nb)
4662{
4663 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4664}
4665EXPORT_SYMBOL(register_inet6addr_notifier);
4666
4667int unregister_inet6addr_notifier(struct notifier_block *nb)
4668{
4669 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4670}
4671EXPORT_SYMBOL(unregister_inet6addr_notifier);
4672
4673static struct rtnl_af_ops inet6_ops = {
4674 .family = AF_INET6,
4675 .fill_link_af = inet6_fill_link_af,
4676 .get_link_af_size = inet6_get_link_af_size,
4677};
4678
4679/*
4680 * Init / cleanup code
4681 */
4682
4683int __init addrconf_init(void)
4684{
4685 int i, err;
4686
4687 err = ipv6_addr_label_init();
4688 if (err < 0) {
4689 printk(KERN_CRIT "IPv6 Addrconf:"
4690 " cannot initialize default policy table: %d.\n", err);
4691 goto out;
4692 }
4693
4694 err = register_pernet_subsys(&addrconf_ops);
4695 if (err < 0)
4696 goto out_addrlabel;
4697
4698 /* The addrconf netdev notifier requires that loopback_dev
4699 * has it's ipv6 private information allocated and setup
4700 * before it can bring up and give link-local addresses
4701 * to other devices which are up.
4702 *
4703 * Unfortunately, loopback_dev is not necessarily the first
4704 * entry in the global dev_base list of net devices. In fact,
4705 * it is likely to be the very last entry on that list.
4706 * So this causes the notifier registry below to try and
4707 * give link-local addresses to all devices besides loopback_dev
4708 * first, then loopback_dev, which cases all the non-loopback_dev
4709 * devices to fail to get a link-local address.
4710 *
4711 * So, as a temporary fix, allocate the ipv6 structure for
4712 * loopback_dev first by hand.
4713 * Longer term, all of the dependencies ipv6 has upon the loopback
4714 * device and it being up should be removed.
4715 */
4716 rtnl_lock();
4717 if (!ipv6_add_dev(init_net.loopback_dev))
4718 err = -ENOMEM;
4719 rtnl_unlock();
4720 if (err)
4721 goto errlo;
4722
4723 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4724 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4725
4726 register_netdevice_notifier(&ipv6_dev_notf);
4727
4728 addrconf_verify(0);
4729
4730 err = rtnl_af_register(&inet6_ops);
4731 if (err < 0)
4732 goto errout_af;
4733
4734 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4735 NULL);
4736 if (err < 0)
4737 goto errout;
4738
4739 /* Only the first call to __rtnl_register can fail */
4740 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4741 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4742 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4743 inet6_dump_ifaddr, NULL);
4744 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4745 inet6_dump_ifmcaddr, NULL);
4746 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4747 inet6_dump_ifacaddr, NULL);
4748
4749 ipv6_addr_label_rtnl_register();
4750
4751 return 0;
4752errout:
4753 rtnl_af_unregister(&inet6_ops);
4754errout_af:
4755 unregister_netdevice_notifier(&ipv6_dev_notf);
4756errlo:
4757 unregister_pernet_subsys(&addrconf_ops);
4758out_addrlabel:
4759 ipv6_addr_label_cleanup();
4760out:
4761 return err;
4762}
4763
4764void addrconf_cleanup(void)
4765{
4766 struct net_device *dev;
4767 int i;
4768
4769 unregister_netdevice_notifier(&ipv6_dev_notf);
4770 unregister_pernet_subsys(&addrconf_ops);
4771 ipv6_addr_label_cleanup();
4772
4773 rtnl_lock();
4774
4775 __rtnl_af_unregister(&inet6_ops);
4776
4777 /* clean dev list */
4778 for_each_netdev(&init_net, dev) {
4779 if (__in6_dev_get(dev) == NULL)
4780 continue;
4781 addrconf_ifdown(dev, 1);
4782 }
4783 addrconf_ifdown(init_net.loopback_dev, 2);
4784
4785 /*
4786 * Check hash table.
4787 */
4788 spin_lock_bh(&addrconf_hash_lock);
4789 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4790 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4791 spin_unlock_bh(&addrconf_hash_lock);
4792
4793 del_timer(&addr_chk_timer);
4794 rtnl_unlock();
4795}