projects / linux-block.git / blame_incremental
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (non-incremental) | history | HEAD
tg3: Enable GRO by default.
[linux-block.git] / net / ipv6 / addrconf.c
... / ...
CommitLineData
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#define TIME_DELTA(a, b) ((unsigned long)((long)(a) - (long)(b)))
102
103#define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
104#define ADDRCONF_TIMER_FUZZ (HZ / 4)
105#define ADDRCONF_TIMER_FUZZ_MAX (HZ)
106
107#ifdef CONFIG_SYSCTL
108static void addrconf_sysctl_register(struct inet6_dev *idev);
109static void addrconf_sysctl_unregister(struct inet6_dev *idev);
110#else
111static inline void addrconf_sysctl_register(struct inet6_dev *idev)
112{
113}
114
115static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
116{
117}
118#endif
119
120#ifdef CONFIG_IPV6_PRIVACY
121static int __ipv6_regen_rndid(struct inet6_dev *idev);
122static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
123static void ipv6_regen_rndid(unsigned long data);
124
125static int desync_factor = MAX_DESYNC_FACTOR * HZ;
126#endif
127
128static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
129static int ipv6_count_addresses(struct inet6_dev *idev);
130
131/*
132 * Configured unicast address hash table
133 */
134static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
135static DEFINE_SPINLOCK(addrconf_hash_lock);
136
137static void addrconf_verify(unsigned long);
138
139static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
140static DEFINE_SPINLOCK(addrconf_verify_lock);
141
142static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
143static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
144
145static void addrconf_type_change(struct net_device *dev,
146 unsigned long event);
147static int addrconf_ifdown(struct net_device *dev, int how);
148
149static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
150static void addrconf_dad_timer(unsigned long data);
151static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
152static void addrconf_dad_run(struct inet6_dev *idev);
153static void addrconf_rs_timer(unsigned long data);
154static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
155static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
156
157static void inet6_prefix_notify(int event, struct inet6_dev *idev,
158 struct prefix_info *pinfo);
159static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
160 struct net_device *dev);
161
162static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
163
164static struct ipv6_devconf ipv6_devconf __read_mostly = {
165 .forwarding = 0,
166 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
167 .mtu6 = IPV6_MIN_MTU,
168 .accept_ra = 1,
169 .accept_redirects = 1,
170 .autoconf = 1,
171 .force_mld_version = 0,
172 .dad_transmits = 1,
173 .rtr_solicits = MAX_RTR_SOLICITATIONS,
174 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
175 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
176#ifdef CONFIG_IPV6_PRIVACY
177 .use_tempaddr = 0,
178 .temp_valid_lft = TEMP_VALID_LIFETIME,
179 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
180 .regen_max_retry = REGEN_MAX_RETRY,
181 .max_desync_factor = MAX_DESYNC_FACTOR,
182#endif
183 .max_addresses = IPV6_MAX_ADDRESSES,
184 .accept_ra_defrtr = 1,
185 .accept_ra_pinfo = 1,
186#ifdef CONFIG_IPV6_ROUTER_PREF
187 .accept_ra_rtr_pref = 1,
188 .rtr_probe_interval = 60 * HZ,
189#ifdef CONFIG_IPV6_ROUTE_INFO
190 .accept_ra_rt_info_max_plen = 0,
191#endif
192#endif
193 .proxy_ndp = 0,
194 .accept_source_route = 0, /* we do not accept RH0 by default. */
195 .disable_ipv6 = 0,
196 .accept_dad = 1,
197};
198
199static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
200 .forwarding = 0,
201 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
202 .mtu6 = IPV6_MIN_MTU,
203 .accept_ra = 1,
204 .accept_redirects = 1,
205 .autoconf = 1,
206 .dad_transmits = 1,
207 .rtr_solicits = MAX_RTR_SOLICITATIONS,
208 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
209 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
210#ifdef CONFIG_IPV6_PRIVACY
211 .use_tempaddr = 0,
212 .temp_valid_lft = TEMP_VALID_LIFETIME,
213 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
214 .regen_max_retry = REGEN_MAX_RETRY,
215 .max_desync_factor = MAX_DESYNC_FACTOR,
216#endif
217 .max_addresses = IPV6_MAX_ADDRESSES,
218 .accept_ra_defrtr = 1,
219 .accept_ra_pinfo = 1,
220#ifdef CONFIG_IPV6_ROUTER_PREF
221 .accept_ra_rtr_pref = 1,
222 .rtr_probe_interval = 60 * HZ,
223#ifdef CONFIG_IPV6_ROUTE_INFO
224 .accept_ra_rt_info_max_plen = 0,
225#endif
226#endif
227 .proxy_ndp = 0,
228 .accept_source_route = 0, /* we do not accept RH0 by default. */
229 .disable_ipv6 = 0,
230 .accept_dad = 1,
231};
232
233/* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
234const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
235const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
236const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
237const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
238
239/* Check if a valid qdisc is available */
240static inline bool addrconf_qdisc_ok(const struct net_device *dev)
241{
242 return !qdisc_tx_is_noop(dev);
243}
244
245/* Check if a route is valid prefix route */
246static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
247{
248 return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
249}
250
251static void addrconf_del_timer(struct inet6_ifaddr *ifp)
252{
253 if (del_timer(&ifp->timer))
254 __in6_ifa_put(ifp);
255}
256
257enum addrconf_timer_t {
258 AC_NONE,
259 AC_DAD,
260 AC_RS,
261};
262
263static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
264 enum addrconf_timer_t what,
265 unsigned long when)
266{
267 if (!del_timer(&ifp->timer))
268 in6_ifa_hold(ifp);
269
270 switch (what) {
271 case AC_DAD:
272 ifp->timer.function = addrconf_dad_timer;
273 break;
274 case AC_RS:
275 ifp->timer.function = addrconf_rs_timer;
276 break;
277 default:
278 break;
279 }
280 ifp->timer.expires = jiffies + when;
281 add_timer(&ifp->timer);
282}
283
284static int snmp6_alloc_dev(struct inet6_dev *idev)
285{
286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
287 sizeof(struct ipstats_mib)) < 0)
288 goto err_ip;
289 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6,
290 sizeof(struct icmpv6_mib)) < 0)
291 goto err_icmp;
292 if (snmp_mib_init((void __percpu **)idev->stats.icmpv6msg,
293 sizeof(struct icmpv6msg_mib)) < 0)
294 goto err_icmpmsg;
295
296 return 0;
297
298err_icmpmsg:
299 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
300err_icmp:
301 snmp_mib_free((void __percpu **)idev->stats.ipv6);
302err_ip:
303 return -ENOMEM;
304}
305
306static void snmp6_free_dev(struct inet6_dev *idev)
307{
308 snmp_mib_free((void __percpu **)idev->stats.icmpv6msg);
309 snmp_mib_free((void __percpu **)idev->stats.icmpv6);
310 snmp_mib_free((void __percpu **)idev->stats.ipv6);
311}
312
313/* Nobody refers to this device, we may destroy it. */
314
315static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
316{
317 struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
318 kfree(idev);
319}
320
321void in6_dev_finish_destroy(struct inet6_dev *idev)
322{
323 struct net_device *dev = idev->dev;
324
325 WARN_ON(!list_empty(&idev->addr_list));
326 WARN_ON(idev->mc_list != NULL);
327
328#ifdef NET_REFCNT_DEBUG
329 printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
330#endif
331 dev_put(dev);
332 if (!idev->dead) {
333 pr_warning("Freeing alive inet6 device %p\n", idev);
334 return;
335 }
336 snmp6_free_dev(idev);
337 call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
338}
339
340EXPORT_SYMBOL(in6_dev_finish_destroy);
341
342static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
343{
344 struct inet6_dev *ndev;
345
346 ASSERT_RTNL();
347
348 if (dev->mtu < IPV6_MIN_MTU)
349 return NULL;
350
351 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
352
353 if (ndev == NULL)
354 return NULL;
355
356 rwlock_init(&ndev->lock);
357 ndev->dev = dev;
358 INIT_LIST_HEAD(&ndev->addr_list);
359
360 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->cnf.sysctl = NULL;
363 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364 if (ndev->nd_parms == NULL) {
365 kfree(ndev);
366 return NULL;
367 }
368 if (ndev->cnf.forwarding)
369 dev_disable_lro(dev);
370 /* We refer to the device */
371 dev_hold(dev);
372
373 if (snmp6_alloc_dev(ndev) < 0) {
374 ADBG((KERN_WARNING
375 "%s(): cannot allocate memory for statistics; dev=%s.\n",
376 __func__, dev->name));
377 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378 ndev->dead = 1;
379 in6_dev_finish_destroy(ndev);
380 return NULL;
381 }
382
383 if (snmp6_register_dev(ndev) < 0) {
384 ADBG((KERN_WARNING
385 "%s(): cannot create /proc/net/dev_snmp6/%s\n",
386 __func__, dev->name));
387 neigh_parms_release(&nd_tbl, ndev->nd_parms);
388 ndev->dead = 1;
389 in6_dev_finish_destroy(ndev);
390 return NULL;
391 }
392
393 /* One reference from device. We must do this before
394 * we invoke __ipv6_regen_rndid().
395 */
396 in6_dev_hold(ndev);
397
398 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
399 ndev->cnf.accept_dad = -1;
400
401#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
402 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
403 printk(KERN_INFO
404 "%s: Disabled Multicast RS\n",
405 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 printk(KERN_INFO
419 "%s: Disabled Privacy Extensions\n",
420 dev->name);
421 ndev->cnf.use_tempaddr = -1;
422 } else {
423 in6_dev_hold(ndev);
424 ipv6_regen_rndid((unsigned long) ndev);
425 }
426#endif
427
428 if (netif_running(dev) && addrconf_qdisc_ok(dev))
429 ndev->if_flags |= IF_READY;
430
431 ipv6_mc_init_dev(ndev);
432 ndev->tstamp = jiffies;
433 addrconf_sysctl_register(ndev);
434 /* protected by rtnl_lock */
435 rcu_assign_pointer(dev->ip6_ptr, ndev);
436
437 /* Join all-node multicast group */
438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
439
440 return ndev;
441}
442
443static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
444{
445 struct inet6_dev *idev;
446
447 ASSERT_RTNL();
448
449 idev = __in6_dev_get(dev);
450 if (!idev) {
451 idev = ipv6_add_dev(dev);
452 if (!idev)
453 return NULL;
454 }
455
456 if (dev->flags&IFF_UP)
457 ipv6_mc_up(idev);
458 return idev;
459}
460
461#ifdef CONFIG_SYSCTL
462static void dev_forward_change(struct inet6_dev *idev)
463{
464 struct net_device *dev;
465 struct inet6_ifaddr *ifa;
466
467 if (!idev)
468 return;
469 dev = idev->dev;
470 if (idev->cnf.forwarding)
471 dev_disable_lro(dev);
472 if (dev && (dev->flags & IFF_MULTICAST)) {
473 if (idev->cnf.forwarding)
474 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
475 else
476 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
477 }
478
479 list_for_each_entry(ifa, &idev->addr_list, if_list) {
480 if (ifa->flags&IFA_F_TENTATIVE)
481 continue;
482 if (idev->cnf.forwarding)
483 addrconf_join_anycast(ifa);
484 else
485 addrconf_leave_anycast(ifa);
486 }
487}
488
489
490static void addrconf_forward_change(struct net *net, __s32 newf)
491{
492 struct net_device *dev;
493 struct inet6_dev *idev;
494
495 rcu_read_lock();
496 for_each_netdev_rcu(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 rcu_read_unlock();
506}
507
508static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
509{
510 struct net *net;
511
512 net = (struct net *)table->extra2;
513 if (p == &net->ipv6.devconf_dflt->forwarding)
514 return 0;
515
516 if (!rtnl_trylock()) {
517 /* Restore the original values before restarting */
518 *p = old;
519 return restart_syscall();
520 }
521
522 if (p == &net->ipv6.devconf_all->forwarding) {
523 __s32 newf = net->ipv6.devconf_all->forwarding;
524 net->ipv6.devconf_dflt->forwarding = newf;
525 addrconf_forward_change(net, newf);
526 } else if ((!*p) ^ (!old))
527 dev_forward_change((struct inet6_dev *)table->extra1);
528 rtnl_unlock();
529
530 if (*p)
531 rt6_purge_dflt_routers(net);
532 return 1;
533}
534#endif
535
536static void inet6_ifa_finish_destroy_rcu(struct rcu_head *head)
537{
538 struct inet6_ifaddr *ifp = container_of(head, struct inet6_ifaddr, rcu);
539 kfree(ifp);
540}
541
542/* Nobody refers to this ifaddr, destroy it */
543void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
544{
545 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
546
547#ifdef NET_REFCNT_DEBUG
548 printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
549#endif
550
551 in6_dev_put(ifp->idev);
552
553 if (del_timer(&ifp->timer))
554 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
555
556 if (!ifp->dead) {
557 pr_warning("Freeing alive inet6 address %p\n", ifp);
558 return;
559 }
560 dst_release(&ifp->rt->u.dst);
561
562 call_rcu(&ifp->rcu, inet6_ifa_finish_destroy_rcu);
563}
564
565static void
566ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
567{
568 struct list_head *p;
569 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
570
571 /*
572 * Each device address list is sorted in order of scope -
573 * global before linklocal.
574 */
575 list_for_each(p, &idev->addr_list) {
576 struct inet6_ifaddr *ifa
577 = list_entry(p, struct inet6_ifaddr, if_list);
578 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
579 break;
580 }
581
582 list_add_tail(&ifp->if_list, p);
583}
584
585static u32 ipv6_addr_hash(const struct in6_addr *addr)
586{
587 /*
588 * We perform the hash function over the last 64 bits of the address
589 * This will include the IEEE address token on links that support it.
590 */
591 return jhash_2words(addr->s6_addr32[2], addr->s6_addr32[3], 0)
592 & (IN6_ADDR_HSIZE - 1);
593}
594
595/* On success it returns ifp with increased reference count */
596
597static struct inet6_ifaddr *
598ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
599 int scope, u32 flags)
600{
601 struct inet6_ifaddr *ifa = NULL;
602 struct rt6_info *rt;
603 unsigned int hash;
604 int err = 0;
605 int addr_type = ipv6_addr_type(addr);
606
607 if (addr_type == IPV6_ADDR_ANY ||
608 addr_type & IPV6_ADDR_MULTICAST ||
609 (!(idev->dev->flags & IFF_LOOPBACK) &&
610 addr_type & IPV6_ADDR_LOOPBACK))
611 return ERR_PTR(-EADDRNOTAVAIL);
612
613 rcu_read_lock_bh();
614 if (idev->dead) {
615 err = -ENODEV; /*XXX*/
616 goto out2;
617 }
618
619 if (idev->cnf.disable_ipv6) {
620 err = -EACCES;
621 goto out2;
622 }
623
624 spin_lock(&addrconf_hash_lock);
625
626 /* Ignore adding duplicate addresses on an interface */
627 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
628 ADBG(("ipv6_add_addr: already assigned\n"));
629 err = -EEXIST;
630 goto out;
631 }
632
633 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
634
635 if (ifa == NULL) {
636 ADBG(("ipv6_add_addr: malloc failed\n"));
637 err = -ENOBUFS;
638 goto out;
639 }
640
641 rt = addrconf_dst_alloc(idev, addr, 0);
642 if (IS_ERR(rt)) {
643 err = PTR_ERR(rt);
644 goto out;
645 }
646
647 ipv6_addr_copy(&ifa->addr, addr);
648
649 spin_lock_init(&ifa->lock);
650 init_timer(&ifa->timer);
651 INIT_HLIST_NODE(&ifa->addr_lst);
652 ifa->timer.data = (unsigned long) ifa;
653 ifa->scope = scope;
654 ifa->prefix_len = pfxlen;
655 ifa->flags = flags | IFA_F_TENTATIVE;
656 ifa->cstamp = ifa->tstamp = jiffies;
657
658 ifa->rt = rt;
659
660 /*
661 * part one of RFC 4429, section 3.3
662 * We should not configure an address as
663 * optimistic if we do not yet know the link
664 * layer address of our nexhop router
665 */
666
667 if (rt->rt6i_nexthop == NULL)
668 ifa->flags &= ~IFA_F_OPTIMISTIC;
669
670 ifa->idev = idev;
671 in6_dev_hold(idev);
672 /* For caller */
673 in6_ifa_hold(ifa);
674
675 /* Add to big hash table */
676 hash = ipv6_addr_hash(addr);
677
678 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
679 spin_unlock(&addrconf_hash_lock);
680
681 write_lock(&idev->lock);
682 /* Add to inet6_dev unicast addr list. */
683 ipv6_link_dev_addr(idev, ifa);
684
685#ifdef CONFIG_IPV6_PRIVACY
686 if (ifa->flags&IFA_F_TEMPORARY) {
687 list_add(&ifa->tmp_list, &idev->tempaddr_list);
688 in6_ifa_hold(ifa);
689 }
690#endif
691
692 in6_ifa_hold(ifa);
693 write_unlock(&idev->lock);
694out2:
695 rcu_read_unlock_bh();
696
697 if (likely(err == 0))
698 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
699 else {
700 kfree(ifa);
701 ifa = ERR_PTR(err);
702 }
703
704 return ifa;
705out:
706 spin_unlock(&addrconf_hash_lock);
707 goto out2;
708}
709
710/* This function wants to get referenced ifp and releases it before return */
711
712static void ipv6_del_addr(struct inet6_ifaddr *ifp)
713{
714 struct inet6_ifaddr *ifa, *ifn;
715 struct inet6_dev *idev = ifp->idev;
716 int hash;
717 int deleted = 0, onlink = 0;
718 unsigned long expires = jiffies;
719
720 hash = ipv6_addr_hash(&ifp->addr);
721
722 ifp->dead = 1;
723
724 spin_lock_bh(&addrconf_hash_lock);
725 hlist_del_init_rcu(&ifp->addr_lst);
726 spin_unlock_bh(&addrconf_hash_lock);
727
728 write_lock_bh(&idev->lock);
729#ifdef CONFIG_IPV6_PRIVACY
730 if (ifp->flags&IFA_F_TEMPORARY) {
731 list_del(&ifp->tmp_list);
732 if (ifp->ifpub) {
733 in6_ifa_put(ifp->ifpub);
734 ifp->ifpub = NULL;
735 }
736 __in6_ifa_put(ifp);
737 }
738#endif
739
740 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
741 if (ifa == ifp) {
742 list_del_init(&ifp->if_list);
743 __in6_ifa_put(ifp);
744
745 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
746 break;
747 deleted = 1;
748 continue;
749 } else if (ifp->flags & IFA_F_PERMANENT) {
750 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
751 ifp->prefix_len)) {
752 if (ifa->flags & IFA_F_PERMANENT) {
753 onlink = 1;
754 if (deleted)
755 break;
756 } else {
757 unsigned long lifetime;
758
759 if (!onlink)
760 onlink = -1;
761
762 spin_lock(&ifa->lock);
763
764 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
765 /*
766 * Note: Because this address is
767 * not permanent, lifetime <
768 * LONG_MAX / HZ here.
769 */
770 if (time_before(expires,
771 ifa->tstamp + lifetime * HZ))
772 expires = ifa->tstamp + lifetime * HZ;
773 spin_unlock(&ifa->lock);
774 }
775 }
776 }
777 }
778 write_unlock_bh(&idev->lock);
779
780 addrconf_del_timer(ifp);
781
782 ipv6_ifa_notify(RTM_DELADDR, ifp);
783
784 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
785
786 /*
787 * Purge or update corresponding prefix
788 *
789 * 1) we don't purge prefix here if address was not permanent.
790 * prefix is managed by its own lifetime.
791 * 2) if there're no addresses, delete prefix.
792 * 3) if there're still other permanent address(es),
793 * corresponding prefix is still permanent.
794 * 4) otherwise, update prefix lifetime to the
795 * longest valid lifetime among the corresponding
796 * addresses on the device.
797 * Note: subsequent RA will update lifetime.
798 *
799 * --yoshfuji
800 */
801 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
802 struct in6_addr prefix;
803 struct rt6_info *rt;
804 struct net *net = dev_net(ifp->idev->dev);
805 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
806 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
807
808 if (rt && addrconf_is_prefix_route(rt)) {
809 if (onlink == 0) {
810 ip6_del_rt(rt);
811 rt = NULL;
812 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
813 rt->rt6i_expires = expires;
814 rt->rt6i_flags |= RTF_EXPIRES;
815 }
816 }
817 dst_release(&rt->u.dst);
818 }
819
820 in6_ifa_put(ifp);
821}
822
823#ifdef CONFIG_IPV6_PRIVACY
824static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
825{
826 struct inet6_dev *idev = ifp->idev;
827 struct in6_addr addr, *tmpaddr;
828 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
829 unsigned long regen_advance;
830 int tmp_plen;
831 int ret = 0;
832 int max_addresses;
833 u32 addr_flags;
834
835 write_lock(&idev->lock);
836 if (ift) {
837 spin_lock_bh(&ift->lock);
838 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
839 spin_unlock_bh(&ift->lock);
840 tmpaddr = &addr;
841 } else {
842 tmpaddr = NULL;
843 }
844retry:
845 in6_dev_hold(idev);
846 if (idev->cnf.use_tempaddr <= 0) {
847 write_unlock(&idev->lock);
848 printk(KERN_INFO
849 "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
850 in6_dev_put(idev);
851 ret = -1;
852 goto out;
853 }
854 spin_lock_bh(&ifp->lock);
855 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
856 idev->cnf.use_tempaddr = -1; /*XXX*/
857 spin_unlock_bh(&ifp->lock);
858 write_unlock(&idev->lock);
859 printk(KERN_WARNING
860 "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
861 in6_dev_put(idev);
862 ret = -1;
863 goto out;
864 }
865 in6_ifa_hold(ifp);
866 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
867 if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
868 spin_unlock_bh(&ifp->lock);
869 write_unlock(&idev->lock);
870 printk(KERN_WARNING
871 "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
872 in6_ifa_put(ifp);
873 in6_dev_put(idev);
874 ret = -1;
875 goto out;
876 }
877 memcpy(&addr.s6_addr[8], idev->rndid, 8);
878 tmp_valid_lft = min_t(__u32,
879 ifp->valid_lft,
880 idev->cnf.temp_valid_lft);
881 tmp_prefered_lft = min_t(__u32,
882 ifp->prefered_lft,
883 idev->cnf.temp_prefered_lft - desync_factor / HZ);
884 tmp_plen = ifp->prefix_len;
885 max_addresses = idev->cnf.max_addresses;
886 tmp_cstamp = ifp->cstamp;
887 tmp_tstamp = ifp->tstamp;
888 spin_unlock_bh(&ifp->lock);
889
890 regen_advance = idev->cnf.regen_max_retry *
891 idev->cnf.dad_transmits *
892 idev->nd_parms->retrans_time / HZ;
893 write_unlock(&idev->lock);
894
895 /* A temporary address is created only if this calculated Preferred
896 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
897 * an implementation must not create a temporary address with a zero
898 * Preferred Lifetime.
899 */
900 if (tmp_prefered_lft <= regen_advance) {
901 in6_ifa_put(ifp);
902 in6_dev_put(idev);
903 ret = -1;
904 goto out;
905 }
906
907 addr_flags = IFA_F_TEMPORARY;
908 /* set in addrconf_prefix_rcv() */
909 if (ifp->flags & IFA_F_OPTIMISTIC)
910 addr_flags |= IFA_F_OPTIMISTIC;
911
912 ift = !max_addresses ||
913 ipv6_count_addresses(idev) < max_addresses ?
914 ipv6_add_addr(idev, &addr, tmp_plen,
915 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
916 addr_flags) : NULL;
917 if (!ift || IS_ERR(ift)) {
918 in6_ifa_put(ifp);
919 in6_dev_put(idev);
920 printk(KERN_INFO
921 "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
922 tmpaddr = &addr;
923 write_lock(&idev->lock);
924 goto retry;
925 }
926
927 spin_lock_bh(&ift->lock);
928 ift->ifpub = ifp;
929 ift->valid_lft = tmp_valid_lft;
930 ift->prefered_lft = tmp_prefered_lft;
931 ift->cstamp = tmp_cstamp;
932 ift->tstamp = tmp_tstamp;
933 spin_unlock_bh(&ift->lock);
934
935 addrconf_dad_start(ift, 0);
936 in6_ifa_put(ift);
937 in6_dev_put(idev);
938out:
939 return ret;
940}
941#endif
942
943/*
944 * Choose an appropriate source address (RFC3484)
945 */
946enum {
947 IPV6_SADDR_RULE_INIT = 0,
948 IPV6_SADDR_RULE_LOCAL,
949 IPV6_SADDR_RULE_SCOPE,
950 IPV6_SADDR_RULE_PREFERRED,
951#ifdef CONFIG_IPV6_MIP6
952 IPV6_SADDR_RULE_HOA,
953#endif
954 IPV6_SADDR_RULE_OIF,
955 IPV6_SADDR_RULE_LABEL,
956#ifdef CONFIG_IPV6_PRIVACY
957 IPV6_SADDR_RULE_PRIVACY,
958#endif
959 IPV6_SADDR_RULE_ORCHID,
960 IPV6_SADDR_RULE_PREFIX,
961 IPV6_SADDR_RULE_MAX
962};
963
964struct ipv6_saddr_score {
965 int rule;
966 int addr_type;
967 struct inet6_ifaddr *ifa;
968 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
969 int scopedist;
970 int matchlen;
971};
972
973struct ipv6_saddr_dst {
974 const struct in6_addr *addr;
975 int ifindex;
976 int scope;
977 int label;
978 unsigned int prefs;
979};
980
981static inline int ipv6_saddr_preferred(int type)
982{
983 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
984 return 1;
985 return 0;
986}
987
988static int ipv6_get_saddr_eval(struct net *net,
989 struct ipv6_saddr_score *score,
990 struct ipv6_saddr_dst *dst,
991 int i)
992{
993 int ret;
994
995 if (i <= score->rule) {
996 switch (i) {
997 case IPV6_SADDR_RULE_SCOPE:
998 ret = score->scopedist;
999 break;
1000 case IPV6_SADDR_RULE_PREFIX:
1001 ret = score->matchlen;
1002 break;
1003 default:
1004 ret = !!test_bit(i, score->scorebits);
1005 }
1006 goto out;
1007 }
1008
1009 switch (i) {
1010 case IPV6_SADDR_RULE_INIT:
1011 /* Rule 0: remember if hiscore is not ready yet */
1012 ret = !!score->ifa;
1013 break;
1014 case IPV6_SADDR_RULE_LOCAL:
1015 /* Rule 1: Prefer same address */
1016 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1017 break;
1018 case IPV6_SADDR_RULE_SCOPE:
1019 /* Rule 2: Prefer appropriate scope
1020 *
1021 * ret
1022 * ^
1023 * -1 | d 15
1024 * ---+--+-+---> scope
1025 * |
1026 * | d is scope of the destination.
1027 * B-d | \
1028 * | \ <- smaller scope is better if
1029 * B-15 | \ if scope is enough for destinaion.
1030 * | ret = B - scope (-1 <= scope >= d <= 15).
1031 * d-C-1 | /
1032 * |/ <- greater is better
1033 * -C / if scope is not enough for destination.
1034 * /| ret = scope - C (-1 <= d < scope <= 15).
1035 *
1036 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1037 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1038 * Assume B = 0 and we get C > 29.
1039 */
1040 ret = __ipv6_addr_src_scope(score->addr_type);
1041 if (ret >= dst->scope)
1042 ret = -ret;
1043 else
1044 ret -= 128; /* 30 is enough */
1045 score->scopedist = ret;
1046 break;
1047 case IPV6_SADDR_RULE_PREFERRED:
1048 /* Rule 3: Avoid deprecated and optimistic addresses */
1049 ret = ipv6_saddr_preferred(score->addr_type) ||
1050 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1051 break;
1052#ifdef CONFIG_IPV6_MIP6
1053 case IPV6_SADDR_RULE_HOA:
1054 {
1055 /* Rule 4: Prefer home address */
1056 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1057 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1058 break;
1059 }
1060#endif
1061 case IPV6_SADDR_RULE_OIF:
1062 /* Rule 5: Prefer outgoing interface */
1063 ret = (!dst->ifindex ||
1064 dst->ifindex == score->ifa->idev->dev->ifindex);
1065 break;
1066 case IPV6_SADDR_RULE_LABEL:
1067 /* Rule 6: Prefer matching label */
1068 ret = ipv6_addr_label(net,
1069 &score->ifa->addr, score->addr_type,
1070 score->ifa->idev->dev->ifindex) == dst->label;
1071 break;
1072#ifdef CONFIG_IPV6_PRIVACY
1073 case IPV6_SADDR_RULE_PRIVACY:
1074 {
1075 /* Rule 7: Prefer public address
1076 * Note: prefer temprary address if use_tempaddr >= 2
1077 */
1078 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1079 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1080 score->ifa->idev->cnf.use_tempaddr >= 2;
1081 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1082 break;
1083 }
1084#endif
1085 case IPV6_SADDR_RULE_ORCHID:
1086 /* Rule 8-: Prefer ORCHID vs ORCHID or
1087 * non-ORCHID vs non-ORCHID
1088 */
1089 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1090 ipv6_addr_orchid(dst->addr));
1091 break;
1092 case IPV6_SADDR_RULE_PREFIX:
1093 /* Rule 8: Use longest matching prefix */
1094 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1095 dst->addr);
1096 break;
1097 default:
1098 ret = 0;
1099 }
1100
1101 if (ret)
1102 __set_bit(i, score->scorebits);
1103 score->rule = i;
1104out:
1105 return ret;
1106}
1107
1108int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1109 const struct in6_addr *daddr, unsigned int prefs,
1110 struct in6_addr *saddr)
1111{
1112 struct ipv6_saddr_score scores[2],
1113 *score = &scores[0], *hiscore = &scores[1];
1114 struct ipv6_saddr_dst dst;
1115 struct net_device *dev;
1116 int dst_type;
1117
1118 dst_type = __ipv6_addr_type(daddr);
1119 dst.addr = daddr;
1120 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1121 dst.scope = __ipv6_addr_src_scope(dst_type);
1122 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1123 dst.prefs = prefs;
1124
1125 hiscore->rule = -1;
1126 hiscore->ifa = NULL;
1127
1128 rcu_read_lock();
1129
1130 for_each_netdev_rcu(net, dev) {
1131 struct inet6_dev *idev;
1132
1133 /* Candidate Source Address (section 4)
1134 * - multicast and link-local destination address,
1135 * the set of candidate source address MUST only
1136 * include addresses assigned to interfaces
1137 * belonging to the same link as the outgoing
1138 * interface.
1139 * (- For site-local destination addresses, the
1140 * set of candidate source addresses MUST only
1141 * include addresses assigned to interfaces
1142 * belonging to the same site as the outgoing
1143 * interface.)
1144 */
1145 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1146 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1147 dst.ifindex && dev->ifindex != dst.ifindex)
1148 continue;
1149
1150 idev = __in6_dev_get(dev);
1151 if (!idev)
1152 continue;
1153
1154 read_lock_bh(&idev->lock);
1155 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1156 int i;
1157
1158 /*
1159 * - Tentative Address (RFC2462 section 5.4)
1160 * - A tentative address is not considered
1161 * "assigned to an interface" in the traditional
1162 * sense, unless it is also flagged as optimistic.
1163 * - Candidate Source Address (section 4)
1164 * - In any case, anycast addresses, multicast
1165 * addresses, and the unspecified address MUST
1166 * NOT be included in a candidate set.
1167 */
1168 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1169 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1170 continue;
1171
1172 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1173
1174 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1175 score->addr_type & IPV6_ADDR_MULTICAST)) {
1176 LIMIT_NETDEBUG(KERN_DEBUG
1177 "ADDRCONF: unspecified / multicast address "
1178 "assigned as unicast address on %s",
1179 dev->name);
1180 continue;
1181 }
1182
1183 score->rule = -1;
1184 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1185
1186 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1187 int minihiscore, miniscore;
1188
1189 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1190 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1191
1192 if (minihiscore > miniscore) {
1193 if (i == IPV6_SADDR_RULE_SCOPE &&
1194 score->scopedist > 0) {
1195 /*
1196 * special case:
1197 * each remaining entry
1198 * has too small (not enough)
1199 * scope, because ifa entries
1200 * are sorted by their scope
1201 * values.
1202 */
1203 goto try_nextdev;
1204 }
1205 break;
1206 } else if (minihiscore < miniscore) {
1207 if (hiscore->ifa)
1208 in6_ifa_put(hiscore->ifa);
1209
1210 in6_ifa_hold(score->ifa);
1211
1212 swap(hiscore, score);
1213
1214 /* restore our iterator */
1215 score->ifa = hiscore->ifa;
1216
1217 break;
1218 }
1219 }
1220 }
1221try_nextdev:
1222 read_unlock_bh(&idev->lock);
1223 }
1224 rcu_read_unlock();
1225
1226 if (!hiscore->ifa)
1227 return -EADDRNOTAVAIL;
1228
1229 ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1230 in6_ifa_put(hiscore->ifa);
1231 return 0;
1232}
1233EXPORT_SYMBOL(ipv6_dev_get_saddr);
1234
1235int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1236 unsigned char banned_flags)
1237{
1238 struct inet6_dev *idev;
1239 int err = -EADDRNOTAVAIL;
1240
1241 rcu_read_lock();
1242 idev = __in6_dev_get(dev);
1243 if (idev) {
1244 struct inet6_ifaddr *ifp;
1245
1246 read_lock_bh(&idev->lock);
1247 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1248 if (ifp->scope == IFA_LINK &&
1249 !(ifp->flags & banned_flags)) {
1250 ipv6_addr_copy(addr, &ifp->addr);
1251 err = 0;
1252 break;
1253 }
1254 }
1255 read_unlock_bh(&idev->lock);
1256 }
1257 rcu_read_unlock();
1258 return err;
1259}
1260
1261static int ipv6_count_addresses(struct inet6_dev *idev)
1262{
1263 int cnt = 0;
1264 struct inet6_ifaddr *ifp;
1265
1266 read_lock_bh(&idev->lock);
1267 list_for_each_entry(ifp, &idev->addr_list, if_list)
1268 cnt++;
1269 read_unlock_bh(&idev->lock);
1270 return cnt;
1271}
1272
1273int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1274 struct net_device *dev, int strict)
1275{
1276 struct inet6_ifaddr *ifp = NULL;
1277 struct hlist_node *node;
1278 unsigned int hash = ipv6_addr_hash(addr);
1279
1280 rcu_read_lock_bh();
1281 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1282 if (!net_eq(dev_net(ifp->idev->dev), net))
1283 continue;
1284 if (ipv6_addr_equal(&ifp->addr, addr) &&
1285 !(ifp->flags&IFA_F_TENTATIVE)) {
1286 if (dev == NULL || ifp->idev->dev == dev ||
1287 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1288 break;
1289 }
1290 }
1291 rcu_read_unlock_bh();
1292
1293 return ifp != NULL;
1294}
1295EXPORT_SYMBOL(ipv6_chk_addr);
1296
1297static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1298 struct net_device *dev)
1299{
1300 unsigned int hash = ipv6_addr_hash(addr);
1301 struct inet6_ifaddr *ifp;
1302 struct hlist_node *node;
1303
1304 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1305 if (!net_eq(dev_net(ifp->idev->dev), net))
1306 continue;
1307 if (ipv6_addr_equal(&ifp->addr, addr)) {
1308 if (dev == NULL || ifp->idev->dev == dev)
1309 return true;
1310 }
1311 }
1312 return false;
1313}
1314
1315int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1316{
1317 struct inet6_dev *idev;
1318 struct inet6_ifaddr *ifa;
1319 int onlink;
1320
1321 onlink = 0;
1322 rcu_read_lock();
1323 idev = __in6_dev_get(dev);
1324 if (idev) {
1325 read_lock_bh(&idev->lock);
1326 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1327 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1328 ifa->prefix_len);
1329 if (onlink)
1330 break;
1331 }
1332 read_unlock_bh(&idev->lock);
1333 }
1334 rcu_read_unlock();
1335 return onlink;
1336}
1337
1338EXPORT_SYMBOL(ipv6_chk_prefix);
1339
1340struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1341 struct net_device *dev, int strict)
1342{
1343 struct inet6_ifaddr *ifp, *result = NULL;
1344 unsigned int hash = ipv6_addr_hash(addr);
1345 struct hlist_node *node;
1346
1347 rcu_read_lock_bh();
1348 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1349 if (!net_eq(dev_net(ifp->idev->dev), net))
1350 continue;
1351 if (ipv6_addr_equal(&ifp->addr, addr)) {
1352 if (dev == NULL || ifp->idev->dev == dev ||
1353 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1354 result = ifp;
1355 in6_ifa_hold(ifp);
1356 break;
1357 }
1358 }
1359 }
1360 rcu_read_unlock_bh();
1361
1362 return result;
1363}
1364
1365/* Gets referenced address, destroys ifaddr */
1366
1367static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1368{
1369 if (ifp->flags&IFA_F_PERMANENT) {
1370 spin_lock_bh(&ifp->lock);
1371 addrconf_del_timer(ifp);
1372 ifp->flags |= IFA_F_TENTATIVE;
1373 if (dad_failed)
1374 ifp->flags |= IFA_F_DADFAILED;
1375 spin_unlock_bh(&ifp->lock);
1376 if (dad_failed)
1377 ipv6_ifa_notify(0, ifp);
1378 in6_ifa_put(ifp);
1379#ifdef CONFIG_IPV6_PRIVACY
1380 } else if (ifp->flags&IFA_F_TEMPORARY) {
1381 struct inet6_ifaddr *ifpub;
1382 spin_lock_bh(&ifp->lock);
1383 ifpub = ifp->ifpub;
1384 if (ifpub) {
1385 in6_ifa_hold(ifpub);
1386 spin_unlock_bh(&ifp->lock);
1387 ipv6_create_tempaddr(ifpub, ifp);
1388 in6_ifa_put(ifpub);
1389 } else {
1390 spin_unlock_bh(&ifp->lock);
1391 }
1392 ipv6_del_addr(ifp);
1393#endif
1394 } else
1395 ipv6_del_addr(ifp);
1396}
1397
1398void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1399{
1400 struct inet6_dev *idev = ifp->idev;
1401
1402 if (net_ratelimit())
1403 printk(KERN_INFO "%s: IPv6 duplicate address %pI6c detected!\n",
1404 ifp->idev->dev->name, &ifp->addr);
1405
1406 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1407 struct in6_addr addr;
1408
1409 addr.s6_addr32[0] = htonl(0xfe800000);
1410 addr.s6_addr32[1] = 0;
1411
1412 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1413 ipv6_addr_equal(&ifp->addr, &addr)) {
1414 /* DAD failed for link-local based on MAC address */
1415 idev->cnf.disable_ipv6 = 1;
1416
1417 printk(KERN_INFO "%s: IPv6 being disabled!\n",
1418 ifp->idev->dev->name);
1419 }
1420 }
1421
1422 addrconf_dad_stop(ifp, 1);
1423}
1424
1425/* Join to solicited addr multicast group. */
1426
1427void addrconf_join_solict(struct net_device *dev, struct in6_addr *addr)
1428{
1429 struct in6_addr maddr;
1430
1431 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1432 return;
1433
1434 addrconf_addr_solict_mult(addr, &maddr);
1435 ipv6_dev_mc_inc(dev, &maddr);
1436}
1437
1438void addrconf_leave_solict(struct inet6_dev *idev, struct in6_addr *addr)
1439{
1440 struct in6_addr maddr;
1441
1442 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1443 return;
1444
1445 addrconf_addr_solict_mult(addr, &maddr);
1446 __ipv6_dev_mc_dec(idev, &maddr);
1447}
1448
1449static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1450{
1451 struct in6_addr addr;
1452 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1453 if (ipv6_addr_any(&addr))
1454 return;
1455 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1456}
1457
1458static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1459{
1460 struct in6_addr addr;
1461 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1462 if (ipv6_addr_any(&addr))
1463 return;
1464 __ipv6_dev_ac_dec(ifp->idev, &addr);
1465}
1466
1467static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1468{
1469 if (dev->addr_len != ETH_ALEN)
1470 return -1;
1471 memcpy(eui, dev->dev_addr, 3);
1472 memcpy(eui + 5, dev->dev_addr + 3, 3);
1473
1474 /*
1475 * The zSeries OSA network cards can be shared among various
1476 * OS instances, but the OSA cards have only one MAC address.
1477 * This leads to duplicate address conflicts in conjunction
1478 * with IPv6 if more than one instance uses the same card.
1479 *
1480 * The driver for these cards can deliver a unique 16-bit
1481 * identifier for each instance sharing the same card. It is
1482 * placed instead of 0xFFFE in the interface identifier. The
1483 * "u" bit of the interface identifier is not inverted in this
1484 * case. Hence the resulting interface identifier has local
1485 * scope according to RFC2373.
1486 */
1487 if (dev->dev_id) {
1488 eui[3] = (dev->dev_id >> 8) & 0xFF;
1489 eui[4] = dev->dev_id & 0xFF;
1490 } else {
1491 eui[3] = 0xFF;
1492 eui[4] = 0xFE;
1493 eui[0] ^= 2;
1494 }
1495 return 0;
1496}
1497
1498static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1499{
1500 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1501 if (dev->addr_len != ARCNET_ALEN)
1502 return -1;
1503 memset(eui, 0, 7);
1504 eui[7] = *(u8*)dev->dev_addr;
1505 return 0;
1506}
1507
1508static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1509{
1510 if (dev->addr_len != INFINIBAND_ALEN)
1511 return -1;
1512 memcpy(eui, dev->dev_addr + 12, 8);
1513 eui[0] |= 2;
1514 return 0;
1515}
1516
1517int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1518{
1519 if (addr == 0)
1520 return -1;
1521 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1522 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1523 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1524 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1525 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1526 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1527 eui[1] = 0;
1528 eui[2] = 0x5E;
1529 eui[3] = 0xFE;
1530 memcpy(eui + 4, &addr, 4);
1531 return 0;
1532}
1533EXPORT_SYMBOL(__ipv6_isatap_ifid);
1534
1535static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1536{
1537 if (dev->priv_flags & IFF_ISATAP)
1538 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1539 return -1;
1540}
1541
1542static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1543{
1544 switch (dev->type) {
1545 case ARPHRD_ETHER:
1546 case ARPHRD_FDDI:
1547 case ARPHRD_IEEE802_TR:
1548 return addrconf_ifid_eui48(eui, dev);
1549 case ARPHRD_ARCNET:
1550 return addrconf_ifid_arcnet(eui, dev);
1551 case ARPHRD_INFINIBAND:
1552 return addrconf_ifid_infiniband(eui, dev);
1553 case ARPHRD_SIT:
1554 return addrconf_ifid_sit(eui, dev);
1555 }
1556 return -1;
1557}
1558
1559static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1560{
1561 int err = -1;
1562 struct inet6_ifaddr *ifp;
1563
1564 read_lock_bh(&idev->lock);
1565 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1566 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1567 memcpy(eui, ifp->addr.s6_addr+8, 8);
1568 err = 0;
1569 break;
1570 }
1571 }
1572 read_unlock_bh(&idev->lock);
1573 return err;
1574}
1575
1576#ifdef CONFIG_IPV6_PRIVACY
1577/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1578static int __ipv6_regen_rndid(struct inet6_dev *idev)
1579{
1580regen:
1581 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1582 idev->rndid[0] &= ~0x02;
1583
1584 /*
1585 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1586 * check if generated address is not inappropriate
1587 *
1588 * - Reserved subnet anycast (RFC 2526)
1589 * 11111101 11....11 1xxxxxxx
1590 * - ISATAP (RFC4214) 6.1
1591 * 00-00-5E-FE-xx-xx-xx-xx
1592 * - value 0
1593 * - XXX: already assigned to an address on the device
1594 */
1595 if (idev->rndid[0] == 0xfd &&
1596 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1597 (idev->rndid[7]&0x80))
1598 goto regen;
1599 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1600 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1601 goto regen;
1602 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1603 goto regen;
1604 }
1605
1606 return 0;
1607}
1608
1609static void ipv6_regen_rndid(unsigned long data)
1610{
1611 struct inet6_dev *idev = (struct inet6_dev *) data;
1612 unsigned long expires;
1613
1614 rcu_read_lock_bh();
1615 write_lock_bh(&idev->lock);
1616
1617 if (idev->dead)
1618 goto out;
1619
1620 if (__ipv6_regen_rndid(idev) < 0)
1621 goto out;
1622
1623 expires = jiffies +
1624 idev->cnf.temp_prefered_lft * HZ -
1625 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1626 if (time_before(expires, jiffies)) {
1627 printk(KERN_WARNING
1628 "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1629 idev->dev->name);
1630 goto out;
1631 }
1632
1633 if (!mod_timer(&idev->regen_timer, expires))
1634 in6_dev_hold(idev);
1635
1636out:
1637 write_unlock_bh(&idev->lock);
1638 rcu_read_unlock_bh();
1639 in6_dev_put(idev);
1640}
1641
1642static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1643 int ret = 0;
1644
1645 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1646 ret = __ipv6_regen_rndid(idev);
1647 return ret;
1648}
1649#endif
1650
1651/*
1652 * Add prefix route.
1653 */
1654
1655static void
1656addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1657 unsigned long expires, u32 flags)
1658{
1659 struct fib6_config cfg = {
1660 .fc_table = RT6_TABLE_PREFIX,
1661 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1662 .fc_ifindex = dev->ifindex,
1663 .fc_expires = expires,
1664 .fc_dst_len = plen,
1665 .fc_flags = RTF_UP | flags,
1666 .fc_nlinfo.nl_net = dev_net(dev),
1667 .fc_protocol = RTPROT_KERNEL,
1668 };
1669
1670 ipv6_addr_copy(&cfg.fc_dst, pfx);
1671
1672 /* Prevent useless cloning on PtP SIT.
1673 This thing is done here expecting that the whole
1674 class of non-broadcast devices need not cloning.
1675 */
1676#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1677 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1678 cfg.fc_flags |= RTF_NONEXTHOP;
1679#endif
1680
1681 ip6_route_add(&cfg);
1682}
1683
1684/* Create "default" multicast route to the interface */
1685
1686static void addrconf_add_mroute(struct net_device *dev)
1687{
1688 struct fib6_config cfg = {
1689 .fc_table = RT6_TABLE_LOCAL,
1690 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1691 .fc_ifindex = dev->ifindex,
1692 .fc_dst_len = 8,
1693 .fc_flags = RTF_UP,
1694 .fc_nlinfo.nl_net = dev_net(dev),
1695 };
1696
1697 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1698
1699 ip6_route_add(&cfg);
1700}
1701
1702#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1703static void sit_route_add(struct net_device *dev)
1704{
1705 struct fib6_config cfg = {
1706 .fc_table = RT6_TABLE_MAIN,
1707 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1708 .fc_ifindex = dev->ifindex,
1709 .fc_dst_len = 96,
1710 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1711 .fc_nlinfo.nl_net = dev_net(dev),
1712 };
1713
1714 /* prefix length - 96 bits "::d.d.d.d" */
1715 ip6_route_add(&cfg);
1716}
1717#endif
1718
1719static void addrconf_add_lroute(struct net_device *dev)
1720{
1721 struct in6_addr addr;
1722
1723 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
1724 addrconf_prefix_route(&addr, 64, dev, 0, 0);
1725}
1726
1727static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1728{
1729 struct inet6_dev *idev;
1730
1731 ASSERT_RTNL();
1732
1733 idev = ipv6_find_idev(dev);
1734 if (!idev)
1735 return NULL;
1736
1737 /* Add default multicast route */
1738 addrconf_add_mroute(dev);
1739
1740 /* Add link local route */
1741 addrconf_add_lroute(dev);
1742 return idev;
1743}
1744
1745void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1746{
1747 struct prefix_info *pinfo;
1748 __u32 valid_lft;
1749 __u32 prefered_lft;
1750 int addr_type;
1751 struct inet6_dev *in6_dev;
1752 struct net *net = dev_net(dev);
1753
1754 pinfo = (struct prefix_info *) opt;
1755
1756 if (len < sizeof(struct prefix_info)) {
1757 ADBG(("addrconf: prefix option too short\n"));
1758 return;
1759 }
1760
1761 /*
1762 * Validation checks ([ADDRCONF], page 19)
1763 */
1764
1765 addr_type = ipv6_addr_type(&pinfo->prefix);
1766
1767 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1768 return;
1769
1770 valid_lft = ntohl(pinfo->valid);
1771 prefered_lft = ntohl(pinfo->prefered);
1772
1773 if (prefered_lft > valid_lft) {
1774 if (net_ratelimit())
1775 printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1776 return;
1777 }
1778
1779 in6_dev = in6_dev_get(dev);
1780
1781 if (in6_dev == NULL) {
1782 if (net_ratelimit())
1783 printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1784 return;
1785 }
1786
1787 /*
1788 * Two things going on here:
1789 * 1) Add routes for on-link prefixes
1790 * 2) Configure prefixes with the auto flag set
1791 */
1792
1793 if (pinfo->onlink) {
1794 struct rt6_info *rt;
1795 unsigned long rt_expires;
1796
1797 /* Avoid arithmetic overflow. Really, we could
1798 * save rt_expires in seconds, likely valid_lft,
1799 * but it would require division in fib gc, that it
1800 * not good.
1801 */
1802 if (HZ > USER_HZ)
1803 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1804 else
1805 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1806
1807 if (addrconf_finite_timeout(rt_expires))
1808 rt_expires *= HZ;
1809
1810 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1811 dev->ifindex, 1);
1812
1813 if (rt && addrconf_is_prefix_route(rt)) {
1814 /* Autoconf prefix route */
1815 if (valid_lft == 0) {
1816 ip6_del_rt(rt);
1817 rt = NULL;
1818 } else if (addrconf_finite_timeout(rt_expires)) {
1819 /* not infinity */
1820 rt->rt6i_expires = jiffies + rt_expires;
1821 rt->rt6i_flags |= RTF_EXPIRES;
1822 } else {
1823 rt->rt6i_flags &= ~RTF_EXPIRES;
1824 rt->rt6i_expires = 0;
1825 }
1826 } else if (valid_lft) {
1827 clock_t expires = 0;
1828 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1829 if (addrconf_finite_timeout(rt_expires)) {
1830 /* not infinity */
1831 flags |= RTF_EXPIRES;
1832 expires = jiffies_to_clock_t(rt_expires);
1833 }
1834 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1835 dev, expires, flags);
1836 }
1837 if (rt)
1838 dst_release(&rt->u.dst);
1839 }
1840
1841 /* Try to figure out our local address for this prefix */
1842
1843 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1844 struct inet6_ifaddr * ifp;
1845 struct in6_addr addr;
1846 int create = 0, update_lft = 0;
1847
1848 if (pinfo->prefix_len == 64) {
1849 memcpy(&addr, &pinfo->prefix, 8);
1850 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1851 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1852 in6_dev_put(in6_dev);
1853 return;
1854 }
1855 goto ok;
1856 }
1857 if (net_ratelimit())
1858 printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1859 pinfo->prefix_len);
1860 in6_dev_put(in6_dev);
1861 return;
1862
1863ok:
1864
1865 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1866
1867 if (ifp == NULL && valid_lft) {
1868 int max_addresses = in6_dev->cnf.max_addresses;
1869 u32 addr_flags = 0;
1870
1871#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1872 if (in6_dev->cnf.optimistic_dad &&
1873 !net->ipv6.devconf_all->forwarding)
1874 addr_flags = IFA_F_OPTIMISTIC;
1875#endif
1876
1877 /* Do not allow to create too much of autoconfigured
1878 * addresses; this would be too easy way to crash kernel.
1879 */
1880 if (!max_addresses ||
1881 ipv6_count_addresses(in6_dev) < max_addresses)
1882 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1883 addr_type&IPV6_ADDR_SCOPE_MASK,
1884 addr_flags);
1885
1886 if (!ifp || IS_ERR(ifp)) {
1887 in6_dev_put(in6_dev);
1888 return;
1889 }
1890
1891 update_lft = create = 1;
1892 ifp->cstamp = jiffies;
1893 addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1894 }
1895
1896 if (ifp) {
1897 int flags;
1898 unsigned long now;
1899#ifdef CONFIG_IPV6_PRIVACY
1900 struct inet6_ifaddr *ift;
1901#endif
1902 u32 stored_lft;
1903
1904 /* update lifetime (RFC2462 5.5.3 e) */
1905 spin_lock(&ifp->lock);
1906 now = jiffies;
1907 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1908 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1909 else
1910 stored_lft = 0;
1911 if (!update_lft && stored_lft) {
1912 if (valid_lft > MIN_VALID_LIFETIME ||
1913 valid_lft > stored_lft)
1914 update_lft = 1;
1915 else if (stored_lft <= MIN_VALID_LIFETIME) {
1916 /* valid_lft <= stored_lft is always true */
1917 /*
1918 * RFC 4862 Section 5.5.3e:
1919 * "Note that the preferred lifetime of
1920 * the corresponding address is always
1921 * reset to the Preferred Lifetime in
1922 * the received Prefix Information
1923 * option, regardless of whether the
1924 * valid lifetime is also reset or
1925 * ignored."
1926 *
1927 * So if the preferred lifetime in
1928 * this advertisement is different
1929 * than what we have stored, but the
1930 * valid lifetime is invalid, just
1931 * reset prefered_lft.
1932 *
1933 * We must set the valid lifetime
1934 * to the stored lifetime since we'll
1935 * be updating the timestamp below,
1936 * else we'll set it back to the
1937 * minumum.
1938 */
1939 if (prefered_lft != ifp->prefered_lft) {
1940 valid_lft = stored_lft;
1941 update_lft = 1;
1942 }
1943 } else {
1944 valid_lft = MIN_VALID_LIFETIME;
1945 if (valid_lft < prefered_lft)
1946 prefered_lft = valid_lft;
1947 update_lft = 1;
1948 }
1949 }
1950
1951 if (update_lft) {
1952 ifp->valid_lft = valid_lft;
1953 ifp->prefered_lft = prefered_lft;
1954 ifp->tstamp = now;
1955 flags = ifp->flags;
1956 ifp->flags &= ~IFA_F_DEPRECATED;
1957 spin_unlock(&ifp->lock);
1958
1959 if (!(flags&IFA_F_TENTATIVE))
1960 ipv6_ifa_notify(0, ifp);
1961 } else
1962 spin_unlock(&ifp->lock);
1963
1964#ifdef CONFIG_IPV6_PRIVACY
1965 read_lock_bh(&in6_dev->lock);
1966 /* update all temporary addresses in the list */
1967 list_for_each_entry(ift, &in6_dev->tempaddr_list, tmp_list) {
1968 /*
1969 * When adjusting the lifetimes of an existing
1970 * temporary address, only lower the lifetimes.
1971 * Implementations must not increase the
1972 * lifetimes of an existing temporary address
1973 * when processing a Prefix Information Option.
1974 */
1975 if (ifp != ift->ifpub)
1976 continue;
1977
1978 spin_lock(&ift->lock);
1979 flags = ift->flags;
1980 if (ift->valid_lft > valid_lft &&
1981 ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1982 ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1983 if (ift->prefered_lft > prefered_lft &&
1984 ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1985 ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1986 spin_unlock(&ift->lock);
1987 if (!(flags&IFA_F_TENTATIVE))
1988 ipv6_ifa_notify(0, ift);
1989 }
1990
1991 if (create && in6_dev->cnf.use_tempaddr > 0) {
1992 /*
1993 * When a new public address is created as described in [ADDRCONF],
1994 * also create a new temporary address.
1995 */
1996 read_unlock_bh(&in6_dev->lock);
1997 ipv6_create_tempaddr(ifp, NULL);
1998 } else {
1999 read_unlock_bh(&in6_dev->lock);
2000 }
2001#endif
2002 in6_ifa_put(ifp);
2003 addrconf_verify(0);
2004 }
2005 }
2006 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2007 in6_dev_put(in6_dev);
2008}
2009
2010/*
2011 * Set destination address.
2012 * Special case for SIT interfaces where we create a new "virtual"
2013 * device.
2014 */
2015int addrconf_set_dstaddr(struct net *net, void __user *arg)
2016{
2017 struct in6_ifreq ireq;
2018 struct net_device *dev;
2019 int err = -EINVAL;
2020
2021 rtnl_lock();
2022
2023 err = -EFAULT;
2024 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2025 goto err_exit;
2026
2027 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2028
2029 err = -ENODEV;
2030 if (dev == NULL)
2031 goto err_exit;
2032
2033#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2034 if (dev->type == ARPHRD_SIT) {
2035 const struct net_device_ops *ops = dev->netdev_ops;
2036 struct ifreq ifr;
2037 struct ip_tunnel_parm p;
2038
2039 err = -EADDRNOTAVAIL;
2040 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2041 goto err_exit;
2042
2043 memset(&p, 0, sizeof(p));
2044 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2045 p.iph.saddr = 0;
2046 p.iph.version = 4;
2047 p.iph.ihl = 5;
2048 p.iph.protocol = IPPROTO_IPV6;
2049 p.iph.ttl = 64;
2050 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2051
2052 if (ops->ndo_do_ioctl) {
2053 mm_segment_t oldfs = get_fs();
2054
2055 set_fs(KERNEL_DS);
2056 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2057 set_fs(oldfs);
2058 } else
2059 err = -EOPNOTSUPP;
2060
2061 if (err == 0) {
2062 err = -ENOBUFS;
2063 dev = __dev_get_by_name(net, p.name);
2064 if (!dev)
2065 goto err_exit;
2066 err = dev_open(dev);
2067 }
2068 }
2069#endif
2070
2071err_exit:
2072 rtnl_unlock();
2073 return err;
2074}
2075
2076/*
2077 * Manual configuration of address on an interface
2078 */
2079static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2080 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2081 __u32 valid_lft)
2082{
2083 struct inet6_ifaddr *ifp;
2084 struct inet6_dev *idev;
2085 struct net_device *dev;
2086 int scope;
2087 u32 flags;
2088 clock_t expires;
2089 unsigned long timeout;
2090
2091 ASSERT_RTNL();
2092
2093 if (plen > 128)
2094 return -EINVAL;
2095
2096 /* check the lifetime */
2097 if (!valid_lft || prefered_lft > valid_lft)
2098 return -EINVAL;
2099
2100 dev = __dev_get_by_index(net, ifindex);
2101 if (!dev)
2102 return -ENODEV;
2103
2104 if ((idev = addrconf_add_dev(dev)) == NULL)
2105 return -ENOBUFS;
2106
2107 scope = ipv6_addr_scope(pfx);
2108
2109 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2110 if (addrconf_finite_timeout(timeout)) {
2111 expires = jiffies_to_clock_t(timeout * HZ);
2112 valid_lft = timeout;
2113 flags = RTF_EXPIRES;
2114 } else {
2115 expires = 0;
2116 flags = 0;
2117 ifa_flags |= IFA_F_PERMANENT;
2118 }
2119
2120 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2121 if (addrconf_finite_timeout(timeout)) {
2122 if (timeout == 0)
2123 ifa_flags |= IFA_F_DEPRECATED;
2124 prefered_lft = timeout;
2125 }
2126
2127 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2128
2129 if (!IS_ERR(ifp)) {
2130 spin_lock_bh(&ifp->lock);
2131 ifp->valid_lft = valid_lft;
2132 ifp->prefered_lft = prefered_lft;
2133 ifp->tstamp = jiffies;
2134 spin_unlock_bh(&ifp->lock);
2135
2136 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2137 expires, flags);
2138 /*
2139 * Note that section 3.1 of RFC 4429 indicates
2140 * that the Optimistic flag should not be set for
2141 * manually configured addresses
2142 */
2143 addrconf_dad_start(ifp, 0);
2144 in6_ifa_put(ifp);
2145 addrconf_verify(0);
2146 return 0;
2147 }
2148
2149 return PTR_ERR(ifp);
2150}
2151
2152static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2153 unsigned int plen)
2154{
2155 struct inet6_ifaddr *ifp;
2156 struct inet6_dev *idev;
2157 struct net_device *dev;
2158
2159 if (plen > 128)
2160 return -EINVAL;
2161
2162 dev = __dev_get_by_index(net, ifindex);
2163 if (!dev)
2164 return -ENODEV;
2165
2166 if ((idev = __in6_dev_get(dev)) == NULL)
2167 return -ENXIO;
2168
2169 read_lock_bh(&idev->lock);
2170 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2171 if (ifp->prefix_len == plen &&
2172 ipv6_addr_equal(pfx, &ifp->addr)) {
2173 in6_ifa_hold(ifp);
2174 read_unlock_bh(&idev->lock);
2175
2176 ipv6_del_addr(ifp);
2177
2178 /* If the last address is deleted administratively,
2179 disable IPv6 on this interface.
2180 */
2181 if (list_empty(&idev->addr_list))
2182 addrconf_ifdown(idev->dev, 1);
2183 return 0;
2184 }
2185 }
2186 read_unlock_bh(&idev->lock);
2187 return -EADDRNOTAVAIL;
2188}
2189
2190
2191int addrconf_add_ifaddr(struct net *net, void __user *arg)
2192{
2193 struct in6_ifreq ireq;
2194 int err;
2195
2196 if (!capable(CAP_NET_ADMIN))
2197 return -EPERM;
2198
2199 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2200 return -EFAULT;
2201
2202 rtnl_lock();
2203 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2204 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2205 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2206 rtnl_unlock();
2207 return err;
2208}
2209
2210int addrconf_del_ifaddr(struct net *net, void __user *arg)
2211{
2212 struct in6_ifreq ireq;
2213 int err;
2214
2215 if (!capable(CAP_NET_ADMIN))
2216 return -EPERM;
2217
2218 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2219 return -EFAULT;
2220
2221 rtnl_lock();
2222 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2223 ireq.ifr6_prefixlen);
2224 rtnl_unlock();
2225 return err;
2226}
2227
2228static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2229 int plen, int scope)
2230{
2231 struct inet6_ifaddr *ifp;
2232
2233 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2234 if (!IS_ERR(ifp)) {
2235 spin_lock_bh(&ifp->lock);
2236 ifp->flags &= ~IFA_F_TENTATIVE;
2237 spin_unlock_bh(&ifp->lock);
2238 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2239 in6_ifa_put(ifp);
2240 }
2241}
2242
2243#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2244static void sit_add_v4_addrs(struct inet6_dev *idev)
2245{
2246 struct in6_addr addr;
2247 struct net_device *dev;
2248 struct net *net = dev_net(idev->dev);
2249 int scope;
2250
2251 ASSERT_RTNL();
2252
2253 memset(&addr, 0, sizeof(struct in6_addr));
2254 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2255
2256 if (idev->dev->flags&IFF_POINTOPOINT) {
2257 addr.s6_addr32[0] = htonl(0xfe800000);
2258 scope = IFA_LINK;
2259 } else {
2260 scope = IPV6_ADDR_COMPATv4;
2261 }
2262
2263 if (addr.s6_addr32[3]) {
2264 add_addr(idev, &addr, 128, scope);
2265 return;
2266 }
2267
2268 for_each_netdev(net, dev) {
2269 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2270 if (in_dev && (dev->flags & IFF_UP)) {
2271 struct in_ifaddr * ifa;
2272
2273 int flag = scope;
2274
2275 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2276 int plen;
2277
2278 addr.s6_addr32[3] = ifa->ifa_local;
2279
2280 if (ifa->ifa_scope == RT_SCOPE_LINK)
2281 continue;
2282 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2283 if (idev->dev->flags&IFF_POINTOPOINT)
2284 continue;
2285 flag |= IFA_HOST;
2286 }
2287 if (idev->dev->flags&IFF_POINTOPOINT)
2288 plen = 64;
2289 else
2290 plen = 96;
2291
2292 add_addr(idev, &addr, plen, flag);
2293 }
2294 }
2295 }
2296}
2297#endif
2298
2299static void init_loopback(struct net_device *dev)
2300{
2301 struct inet6_dev *idev;
2302
2303 /* ::1 */
2304
2305 ASSERT_RTNL();
2306
2307 if ((idev = ipv6_find_idev(dev)) == NULL) {
2308 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2309 return;
2310 }
2311
2312 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2313}
2314
2315static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2316{
2317 struct inet6_ifaddr * ifp;
2318 u32 addr_flags = IFA_F_PERMANENT;
2319
2320#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2321 if (idev->cnf.optimistic_dad &&
2322 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2323 addr_flags |= IFA_F_OPTIMISTIC;
2324#endif
2325
2326
2327 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2328 if (!IS_ERR(ifp)) {
2329 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2330 addrconf_dad_start(ifp, 0);
2331 in6_ifa_put(ifp);
2332 }
2333}
2334
2335static void addrconf_dev_config(struct net_device *dev)
2336{
2337 struct in6_addr addr;
2338 struct inet6_dev * idev;
2339
2340 ASSERT_RTNL();
2341
2342 if ((dev->type != ARPHRD_ETHER) &&
2343 (dev->type != ARPHRD_FDDI) &&
2344 (dev->type != ARPHRD_IEEE802_TR) &&
2345 (dev->type != ARPHRD_ARCNET) &&
2346 (dev->type != ARPHRD_INFINIBAND)) {
2347 /* Alas, we support only Ethernet autoconfiguration. */
2348 return;
2349 }
2350
2351 idev = addrconf_add_dev(dev);
2352 if (idev == NULL)
2353 return;
2354
2355 memset(&addr, 0, sizeof(struct in6_addr));
2356 addr.s6_addr32[0] = htonl(0xFE800000);
2357
2358 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2359 addrconf_add_linklocal(idev, &addr);
2360}
2361
2362#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2363static void addrconf_sit_config(struct net_device *dev)
2364{
2365 struct inet6_dev *idev;
2366
2367 ASSERT_RTNL();
2368
2369 /*
2370 * Configure the tunnel with one of our IPv4
2371 * addresses... we should configure all of
2372 * our v4 addrs in the tunnel
2373 */
2374
2375 if ((idev = ipv6_find_idev(dev)) == NULL) {
2376 printk(KERN_DEBUG "init sit: add_dev failed\n");
2377 return;
2378 }
2379
2380 if (dev->priv_flags & IFF_ISATAP) {
2381 struct in6_addr addr;
2382
2383 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2384 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2385 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2386 addrconf_add_linklocal(idev, &addr);
2387 return;
2388 }
2389
2390 sit_add_v4_addrs(idev);
2391
2392 if (dev->flags&IFF_POINTOPOINT) {
2393 addrconf_add_mroute(dev);
2394 addrconf_add_lroute(dev);
2395 } else
2396 sit_route_add(dev);
2397}
2398#endif
2399
2400static inline int
2401ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2402{
2403 struct in6_addr lladdr;
2404
2405 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2406 addrconf_add_linklocal(idev, &lladdr);
2407 return 0;
2408 }
2409 return -1;
2410}
2411
2412static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2413{
2414 struct net_device *link_dev;
2415 struct net *net = dev_net(idev->dev);
2416
2417 /* first try to inherit the link-local address from the link device */
2418 if (idev->dev->iflink &&
2419 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2420 if (!ipv6_inherit_linklocal(idev, link_dev))
2421 return;
2422 }
2423 /* then try to inherit it from any device */
2424 for_each_netdev(net, link_dev) {
2425 if (!ipv6_inherit_linklocal(idev, link_dev))
2426 return;
2427 }
2428 printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2429}
2430
2431/*
2432 * Autoconfigure tunnel with a link-local address so routing protocols,
2433 * DHCPv6, MLD etc. can be run over the virtual link
2434 */
2435
2436static void addrconf_ip6_tnl_config(struct net_device *dev)
2437{
2438 struct inet6_dev *idev;
2439
2440 ASSERT_RTNL();
2441
2442 idev = addrconf_add_dev(dev);
2443 if (!idev) {
2444 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2445 return;
2446 }
2447 ip6_tnl_add_linklocal(idev);
2448}
2449
2450static int addrconf_notify(struct notifier_block *this, unsigned long event,
2451 void * data)
2452{
2453 struct net_device *dev = (struct net_device *) data;
2454 struct inet6_dev *idev = __in6_dev_get(dev);
2455 int run_pending = 0;
2456 int err;
2457
2458 switch (event) {
2459 case NETDEV_REGISTER:
2460 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2461 idev = ipv6_add_dev(dev);
2462 if (!idev)
2463 return notifier_from_errno(-ENOMEM);
2464 }
2465 break;
2466
2467 case NETDEV_UP:
2468 case NETDEV_CHANGE:
2469 if (dev->flags & IFF_SLAVE)
2470 break;
2471
2472 if (event == NETDEV_UP) {
2473 if (!addrconf_qdisc_ok(dev)) {
2474 /* device is not ready yet. */
2475 printk(KERN_INFO
2476 "ADDRCONF(NETDEV_UP): %s: "
2477 "link is not ready\n",
2478 dev->name);
2479 break;
2480 }
2481
2482 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2483 idev = ipv6_add_dev(dev);
2484
2485 if (idev) {
2486 idev->if_flags |= IF_READY;
2487 run_pending = 1;
2488 }
2489 } else {
2490 if (!addrconf_qdisc_ok(dev)) {
2491 /* device is still not ready. */
2492 break;
2493 }
2494
2495 if (idev) {
2496 if (idev->if_flags & IF_READY)
2497 /* device is already configured. */
2498 break;
2499 idev->if_flags |= IF_READY;
2500 }
2501
2502 printk(KERN_INFO
2503 "ADDRCONF(NETDEV_CHANGE): %s: "
2504 "link becomes ready\n",
2505 dev->name);
2506
2507 run_pending = 1;
2508 }
2509
2510 switch (dev->type) {
2511#if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2512 case ARPHRD_SIT:
2513 addrconf_sit_config(dev);
2514 break;
2515#endif
2516 case ARPHRD_TUNNEL6:
2517 addrconf_ip6_tnl_config(dev);
2518 break;
2519 case ARPHRD_LOOPBACK:
2520 init_loopback(dev);
2521 break;
2522
2523 default:
2524 addrconf_dev_config(dev);
2525 break;
2526 }
2527
2528 if (idev) {
2529 if (run_pending)
2530 addrconf_dad_run(idev);
2531
2532 /*
2533 * If the MTU changed during the interface down,
2534 * when the interface up, the changed MTU must be
2535 * reflected in the idev as well as routers.
2536 */
2537 if (idev->cnf.mtu6 != dev->mtu &&
2538 dev->mtu >= IPV6_MIN_MTU) {
2539 rt6_mtu_change(dev, dev->mtu);
2540 idev->cnf.mtu6 = dev->mtu;
2541 }
2542 idev->tstamp = jiffies;
2543 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2544
2545 /*
2546 * If the changed mtu during down is lower than
2547 * IPV6_MIN_MTU stop IPv6 on this interface.
2548 */
2549 if (dev->mtu < IPV6_MIN_MTU)
2550 addrconf_ifdown(dev, 1);
2551 }
2552 break;
2553
2554 case NETDEV_CHANGEMTU:
2555 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2556 rt6_mtu_change(dev, dev->mtu);
2557 idev->cnf.mtu6 = dev->mtu;
2558 break;
2559 }
2560
2561 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2562 idev = ipv6_add_dev(dev);
2563 if (idev)
2564 break;
2565 }
2566
2567 /*
2568 * MTU falled under IPV6_MIN_MTU.
2569 * Stop IPv6 on this interface.
2570 */
2571
2572 case NETDEV_DOWN:
2573 case NETDEV_UNREGISTER:
2574 /*
2575 * Remove all addresses from this interface.
2576 */
2577 addrconf_ifdown(dev, event != NETDEV_DOWN);
2578 break;
2579
2580 case NETDEV_CHANGENAME:
2581 if (idev) {
2582 snmp6_unregister_dev(idev);
2583 addrconf_sysctl_unregister(idev);
2584 addrconf_sysctl_register(idev);
2585 err = snmp6_register_dev(idev);
2586 if (err)
2587 return notifier_from_errno(err);
2588 }
2589 break;
2590
2591 case NETDEV_PRE_TYPE_CHANGE:
2592 case NETDEV_POST_TYPE_CHANGE:
2593 addrconf_type_change(dev, event);
2594 break;
2595 }
2596
2597 return NOTIFY_OK;
2598}
2599
2600/*
2601 * addrconf module should be notified of a device going up
2602 */
2603static struct notifier_block ipv6_dev_notf = {
2604 .notifier_call = addrconf_notify,
2605};
2606
2607static void addrconf_type_change(struct net_device *dev, unsigned long event)
2608{
2609 struct inet6_dev *idev;
2610 ASSERT_RTNL();
2611
2612 idev = __in6_dev_get(dev);
2613
2614 if (event == NETDEV_POST_TYPE_CHANGE)
2615 ipv6_mc_remap(idev);
2616 else if (event == NETDEV_PRE_TYPE_CHANGE)
2617 ipv6_mc_unmap(idev);
2618}
2619
2620static int addrconf_ifdown(struct net_device *dev, int how)
2621{
2622 struct net *net = dev_net(dev);
2623 struct inet6_dev *idev;
2624 struct inet6_ifaddr *ifa;
2625 LIST_HEAD(keep_list);
2626
2627 ASSERT_RTNL();
2628
2629 rt6_ifdown(net, dev);
2630 neigh_ifdown(&nd_tbl, dev);
2631
2632 idev = __in6_dev_get(dev);
2633 if (idev == NULL)
2634 return -ENODEV;
2635
2636 /*
2637 * Step 1: remove reference to ipv6 device from parent device.
2638 * Do not dev_put!
2639 */
2640 if (how) {
2641 idev->dead = 1;
2642
2643 /* protected by rtnl_lock */
2644 rcu_assign_pointer(dev->ip6_ptr, NULL);
2645
2646 /* Step 1.5: remove snmp6 entry */
2647 snmp6_unregister_dev(idev);
2648
2649 }
2650
2651 write_lock_bh(&idev->lock);
2652
2653 /* Step 2: clear flags for stateless addrconf */
2654 if (!how)
2655 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2656
2657#ifdef CONFIG_IPV6_PRIVACY
2658 if (how && del_timer(&idev->regen_timer))
2659 in6_dev_put(idev);
2660
2661 /* Step 3: clear tempaddr list */
2662 while (!list_empty(&idev->tempaddr_list)) {
2663 ifa = list_first_entry(&idev->tempaddr_list,
2664 struct inet6_ifaddr, tmp_list);
2665 list_del(&ifa->tmp_list);
2666 ifa->dead = 1;
2667 write_unlock_bh(&idev->lock);
2668 spin_lock_bh(&ifa->lock);
2669
2670 if (ifa->ifpub) {
2671 in6_ifa_put(ifa->ifpub);
2672 ifa->ifpub = NULL;
2673 }
2674 spin_unlock_bh(&ifa->lock);
2675 in6_ifa_put(ifa);
2676 write_lock_bh(&idev->lock);
2677 }
2678#endif
2679
2680 while (!list_empty(&idev->addr_list)) {
2681 ifa = list_first_entry(&idev->addr_list,
2682 struct inet6_ifaddr, if_list);
2683 addrconf_del_timer(ifa);
2684
2685 /* If just doing link down, and address is permanent
2686 and not link-local, then retain it. */
2687 if (!how &&
2688 (ifa->flags&IFA_F_PERMANENT) &&
2689 !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
2690 list_move_tail(&ifa->if_list, &keep_list);
2691
2692 /* If not doing DAD on this address, just keep it. */
2693 if ((dev->flags&(IFF_NOARP|IFF_LOOPBACK)) ||
2694 idev->cnf.accept_dad <= 0 ||
2695 (ifa->flags & IFA_F_NODAD))
2696 continue;
2697
2698 /* If it was tentative already, no need to notify */
2699 if (ifa->flags & IFA_F_TENTATIVE)
2700 continue;
2701
2702 /* Flag it for later restoration when link comes up */
2703 ifa->flags |= IFA_F_TENTATIVE;
2704 in6_ifa_hold(ifa);
2705 write_unlock_bh(&idev->lock);
2706 } else {
2707 list_del(&ifa->if_list);
2708 ifa->dead = 1;
2709 write_unlock_bh(&idev->lock);
2710
2711 /* clear hash table */
2712 spin_lock_bh(&addrconf_hash_lock);
2713 hlist_del_init_rcu(&ifa->addr_lst);
2714 spin_unlock_bh(&addrconf_hash_lock);
2715 }
2716
2717 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2718 if (ifa->dead)
2719 atomic_notifier_call_chain(&inet6addr_chain,
2720 NETDEV_DOWN, ifa);
2721 in6_ifa_put(ifa);
2722
2723 write_lock_bh(&idev->lock);
2724 }
2725
2726 list_splice(&keep_list, &idev->addr_list);
2727
2728 write_unlock_bh(&idev->lock);
2729
2730 /* Step 5: Discard multicast list */
2731 if (how)
2732 ipv6_mc_destroy_dev(idev);
2733 else
2734 ipv6_mc_down(idev);
2735
2736 idev->tstamp = jiffies;
2737
2738 /* Last: Shot the device (if unregistered) */
2739 if (how) {
2740 addrconf_sysctl_unregister(idev);
2741 neigh_parms_release(&nd_tbl, idev->nd_parms);
2742 neigh_ifdown(&nd_tbl, dev);
2743 in6_dev_put(idev);
2744 }
2745 return 0;
2746}
2747
2748static void addrconf_rs_timer(unsigned long data)
2749{
2750 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2751 struct inet6_dev *idev = ifp->idev;
2752
2753 read_lock(&idev->lock);
2754 if (idev->dead || !(idev->if_flags & IF_READY))
2755 goto out;
2756
2757 if (idev->cnf.forwarding)
2758 goto out;
2759
2760 /* Announcement received after solicitation was sent */
2761 if (idev->if_flags & IF_RA_RCVD)
2762 goto out;
2763
2764 spin_lock(&ifp->lock);
2765 if (ifp->probes++ < idev->cnf.rtr_solicits) {
2766 /* The wait after the last probe can be shorter */
2767 addrconf_mod_timer(ifp, AC_RS,
2768 (ifp->probes == idev->cnf.rtr_solicits) ?
2769 idev->cnf.rtr_solicit_delay :
2770 idev->cnf.rtr_solicit_interval);
2771 spin_unlock(&ifp->lock);
2772
2773 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2774 } else {
2775 spin_unlock(&ifp->lock);
2776 /*
2777 * Note: we do not support deprecated "all on-link"
2778 * assumption any longer.
2779 */
2780 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2781 idev->dev->name);
2782 }
2783
2784out:
2785 read_unlock(&idev->lock);
2786 in6_ifa_put(ifp);
2787}
2788
2789/*
2790 * Duplicate Address Detection
2791 */
2792static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2793{
2794 unsigned long rand_num;
2795 struct inet6_dev *idev = ifp->idev;
2796
2797 if (ifp->flags & IFA_F_OPTIMISTIC)
2798 rand_num = 0;
2799 else
2800 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2801
2802 ifp->probes = idev->cnf.dad_transmits;
2803 addrconf_mod_timer(ifp, AC_DAD, rand_num);
2804}
2805
2806static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2807{
2808 struct inet6_dev *idev = ifp->idev;
2809 struct net_device *dev = idev->dev;
2810
2811 addrconf_join_solict(dev, &ifp->addr);
2812
2813 net_srandom(ifp->addr.s6_addr32[3]);
2814
2815 read_lock_bh(&idev->lock);
2816 if (ifp->dead)
2817 goto out;
2818
2819 spin_lock(&ifp->lock);
2820 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2821 idev->cnf.accept_dad < 1 ||
2822 !(ifp->flags&IFA_F_TENTATIVE) ||
2823 ifp->flags & IFA_F_NODAD) {
2824 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2825 spin_unlock(&ifp->lock);
2826 read_unlock_bh(&idev->lock);
2827
2828 addrconf_dad_completed(ifp);
2829 return;
2830 }
2831
2832 if (!(idev->if_flags & IF_READY)) {
2833 spin_unlock(&ifp->lock);
2834 read_unlock_bh(&idev->lock);
2835 /*
2836 * If the device is not ready:
2837 * - keep it tentative if it is a permanent address.
2838 * - otherwise, kill it.
2839 */
2840 in6_ifa_hold(ifp);
2841 addrconf_dad_stop(ifp, 0);
2842 return;
2843 }
2844
2845 /*
2846 * Optimistic nodes can start receiving
2847 * Frames right away
2848 */
2849 if (ifp->flags & IFA_F_OPTIMISTIC)
2850 ip6_ins_rt(ifp->rt);
2851
2852 addrconf_dad_kick(ifp);
2853 spin_unlock(&ifp->lock);
2854out:
2855 read_unlock_bh(&idev->lock);
2856}
2857
2858static void addrconf_dad_timer(unsigned long data)
2859{
2860 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2861 struct inet6_dev *idev = ifp->idev;
2862 struct in6_addr mcaddr;
2863
2864 read_lock(&idev->lock);
2865 if (idev->dead || !(idev->if_flags & IF_READY)) {
2866 read_unlock(&idev->lock);
2867 goto out;
2868 }
2869
2870 spin_lock(&ifp->lock);
2871 if (ifp->probes == 0) {
2872 /*
2873 * DAD was successful
2874 */
2875
2876 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2877 spin_unlock(&ifp->lock);
2878 read_unlock(&idev->lock);
2879
2880 addrconf_dad_completed(ifp);
2881
2882 goto out;
2883 }
2884
2885 ifp->probes--;
2886 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2887 spin_unlock(&ifp->lock);
2888 read_unlock(&idev->lock);
2889
2890 /* send a neighbour solicitation for our addr */
2891 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2892 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2893out:
2894 in6_ifa_put(ifp);
2895}
2896
2897static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2898{
2899 struct net_device *dev = ifp->idev->dev;
2900
2901 /*
2902 * Configure the address for reception. Now it is valid.
2903 */
2904
2905 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2906
2907 /* If added prefix is link local and forwarding is off,
2908 start sending router solicitations.
2909 */
2910
2911 if (ifp->idev->cnf.forwarding == 0 &&
2912 ifp->idev->cnf.rtr_solicits > 0 &&
2913 (dev->flags&IFF_LOOPBACK) == 0 &&
2914 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2915 /*
2916 * If a host as already performed a random delay
2917 * [...] as part of DAD [...] there is no need
2918 * to delay again before sending the first RS
2919 */
2920 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2921
2922 spin_lock_bh(&ifp->lock);
2923 ifp->probes = 1;
2924 ifp->idev->if_flags |= IF_RS_SENT;
2925 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2926 spin_unlock_bh(&ifp->lock);
2927 }
2928}
2929
2930static void addrconf_dad_run(struct inet6_dev *idev)
2931{
2932 struct inet6_ifaddr *ifp;
2933
2934 read_lock_bh(&idev->lock);
2935 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2936 spin_lock(&ifp->lock);
2937 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2938 spin_unlock(&ifp->lock);
2939 continue;
2940 }
2941 spin_unlock(&ifp->lock);
2942 addrconf_dad_kick(ifp);
2943 }
2944 read_unlock_bh(&idev->lock);
2945}
2946
2947#ifdef CONFIG_PROC_FS
2948struct if6_iter_state {
2949 struct seq_net_private p;
2950 int bucket;
2951};
2952
2953static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2954{
2955 struct inet6_ifaddr *ifa = NULL;
2956 struct if6_iter_state *state = seq->private;
2957 struct net *net = seq_file_net(seq);
2958
2959 for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2960 struct hlist_node *n;
2961 hlist_for_each_entry_rcu(ifa, n, &inet6_addr_lst[state->bucket],
2962 addr_lst)
2963 if (net_eq(dev_net(ifa->idev->dev), net))
2964 return ifa;
2965 }
2966 return NULL;
2967}
2968
2969static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
2970 struct inet6_ifaddr *ifa)
2971{
2972 struct if6_iter_state *state = seq->private;
2973 struct net *net = seq_file_net(seq);
2974 struct hlist_node *n = &ifa->addr_lst;
2975
2976 hlist_for_each_entry_continue_rcu(ifa, n, addr_lst)
2977 if (net_eq(dev_net(ifa->idev->dev), net))
2978 return ifa;
2979
2980 while (++state->bucket < IN6_ADDR_HSIZE) {
2981 hlist_for_each_entry(ifa, n,
2982 &inet6_addr_lst[state->bucket], addr_lst) {
2983 if (net_eq(dev_net(ifa->idev->dev), net))
2984 return ifa;
2985 }
2986 }
2987
2988 return NULL;
2989}
2990
2991static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2992{
2993 struct inet6_ifaddr *ifa = if6_get_first(seq);
2994
2995 if (ifa)
2996 while (pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2997 --pos;
2998 return pos ? NULL : ifa;
2999}
3000
3001static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3002 __acquires(rcu)
3003{
3004 rcu_read_lock_bh();
3005 return if6_get_idx(seq, *pos);
3006}
3007
3008static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3009{
3010 struct inet6_ifaddr *ifa;
3011
3012 ifa = if6_get_next(seq, v);
3013 ++*pos;
3014 return ifa;
3015}
3016
3017static void if6_seq_stop(struct seq_file *seq, void *v)
3018 __releases(rcu)
3019{
3020 rcu_read_unlock_bh();
3021}
3022
3023static int if6_seq_show(struct seq_file *seq, void *v)
3024{
3025 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3026 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3027 &ifp->addr,
3028 ifp->idev->dev->ifindex,
3029 ifp->prefix_len,
3030 ifp->scope,
3031 ifp->flags,
3032 ifp->idev->dev->name);
3033 return 0;
3034}
3035
3036static const struct seq_operations if6_seq_ops = {
3037 .start = if6_seq_start,
3038 .next = if6_seq_next,
3039 .show = if6_seq_show,
3040 .stop = if6_seq_stop,
3041};
3042
3043static int if6_seq_open(struct inode *inode, struct file *file)
3044{
3045 return seq_open_net(inode, file, &if6_seq_ops,
3046 sizeof(struct if6_iter_state));
3047}
3048
3049static const struct file_operations if6_fops = {
3050 .owner = THIS_MODULE,
3051 .open = if6_seq_open,
3052 .read = seq_read,
3053 .llseek = seq_lseek,
3054 .release = seq_release_net,
3055};
3056
3057static int __net_init if6_proc_net_init(struct net *net)
3058{
3059 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3060 return -ENOMEM;
3061 return 0;
3062}
3063
3064static void __net_exit if6_proc_net_exit(struct net *net)
3065{
3066 proc_net_remove(net, "if_inet6");
3067}
3068
3069static struct pernet_operations if6_proc_net_ops = {
3070 .init = if6_proc_net_init,
3071 .exit = if6_proc_net_exit,
3072};
3073
3074int __init if6_proc_init(void)
3075{
3076 return register_pernet_subsys(&if6_proc_net_ops);
3077}
3078
3079void if6_proc_exit(void)
3080{
3081 unregister_pernet_subsys(&if6_proc_net_ops);
3082}
3083#endif /* CONFIG_PROC_FS */
3084
3085#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3086/* Check if address is a home address configured on any interface. */
3087int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3088{
3089 int ret = 0;
3090 struct inet6_ifaddr *ifp = NULL;
3091 struct hlist_node *n;
3092 unsigned int hash = ipv6_addr_hash(addr);
3093
3094 rcu_read_lock_bh();
3095 hlist_for_each_entry_rcu(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3096 if (!net_eq(dev_net(ifp->idev->dev), net))
3097 continue;
3098 if (ipv6_addr_equal(&ifp->addr, addr) &&
3099 (ifp->flags & IFA_F_HOMEADDRESS)) {
3100 ret = 1;
3101 break;
3102 }
3103 }
3104 rcu_read_unlock_bh();
3105 return ret;
3106}
3107#endif
3108
3109/*
3110 * Periodic address status verification
3111 */
3112
3113static void addrconf_verify(unsigned long foo)
3114{
3115 unsigned long now, next, next_sec, next_sched;
3116 struct inet6_ifaddr *ifp;
3117 struct hlist_node *node;
3118 int i;
3119
3120 rcu_read_lock_bh();
3121 spin_lock(&addrconf_verify_lock);
3122 now = jiffies;
3123 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3124
3125 del_timer(&addr_chk_timer);
3126
3127 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3128restart:
3129 hlist_for_each_entry_rcu(ifp, node,
3130 &inet6_addr_lst[i], addr_lst) {
3131 unsigned long age;
3132
3133 if (ifp->flags & IFA_F_PERMANENT)
3134 continue;
3135
3136 spin_lock(&ifp->lock);
3137 /* We try to batch several events at once. */
3138 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3139
3140 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3141 age >= ifp->valid_lft) {
3142 spin_unlock(&ifp->lock);
3143 in6_ifa_hold(ifp);
3144 ipv6_del_addr(ifp);
3145 goto restart;
3146 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3147 spin_unlock(&ifp->lock);
3148 continue;
3149 } else if (age >= ifp->prefered_lft) {
3150 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3151 int deprecate = 0;
3152
3153 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3154 deprecate = 1;
3155 ifp->flags |= IFA_F_DEPRECATED;
3156 }
3157
3158 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3159 next = ifp->tstamp + ifp->valid_lft * HZ;
3160
3161 spin_unlock(&ifp->lock);
3162
3163 if (deprecate) {
3164 in6_ifa_hold(ifp);
3165
3166 ipv6_ifa_notify(0, ifp);
3167 in6_ifa_put(ifp);
3168 goto restart;
3169 }
3170#ifdef CONFIG_IPV6_PRIVACY
3171 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3172 !(ifp->flags&IFA_F_TENTATIVE)) {
3173 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3174 ifp->idev->cnf.dad_transmits *
3175 ifp->idev->nd_parms->retrans_time / HZ;
3176
3177 if (age >= ifp->prefered_lft - regen_advance) {
3178 struct inet6_ifaddr *ifpub = ifp->ifpub;
3179 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3180 next = ifp->tstamp + ifp->prefered_lft * HZ;
3181 if (!ifp->regen_count && ifpub) {
3182 ifp->regen_count++;
3183 in6_ifa_hold(ifp);
3184 in6_ifa_hold(ifpub);
3185 spin_unlock(&ifp->lock);
3186
3187 spin_lock(&ifpub->lock);
3188 ifpub->regen_count = 0;
3189 spin_unlock(&ifpub->lock);
3190 ipv6_create_tempaddr(ifpub, ifp);
3191 in6_ifa_put(ifpub);
3192 in6_ifa_put(ifp);
3193 goto restart;
3194 }
3195 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3196 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3197 spin_unlock(&ifp->lock);
3198#endif
3199 } else {
3200 /* ifp->prefered_lft <= ifp->valid_lft */
3201 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3202 next = ifp->tstamp + ifp->prefered_lft * HZ;
3203 spin_unlock(&ifp->lock);
3204 }
3205 }
3206 }
3207
3208 next_sec = round_jiffies_up(next);
3209 next_sched = next;
3210
3211 /* If rounded timeout is accurate enough, accept it. */
3212 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3213 next_sched = next_sec;
3214
3215 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3216 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3217 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3218
3219 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3220 now, next, next_sec, next_sched));
3221
3222 addr_chk_timer.expires = next_sched;
3223 add_timer(&addr_chk_timer);
3224 spin_unlock(&addrconf_verify_lock);
3225 rcu_read_unlock_bh();
3226}
3227
3228static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3229{
3230 struct in6_addr *pfx = NULL;
3231
3232 if (addr)
3233 pfx = nla_data(addr);
3234
3235 if (local) {
3236 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3237 pfx = NULL;
3238 else
3239 pfx = nla_data(local);
3240 }
3241
3242 return pfx;
3243}
3244
3245static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3246 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3247 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3248 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3249};
3250
3251static int
3252inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3253{
3254 struct net *net = sock_net(skb->sk);
3255 struct ifaddrmsg *ifm;
3256 struct nlattr *tb[IFA_MAX+1];
3257 struct in6_addr *pfx;
3258 int err;
3259
3260 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3261 if (err < 0)
3262 return err;
3263
3264 ifm = nlmsg_data(nlh);
3265 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3266 if (pfx == NULL)
3267 return -EINVAL;
3268
3269 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3270}
3271
3272static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3273 u32 prefered_lft, u32 valid_lft)
3274{
3275 u32 flags;
3276 clock_t expires;
3277 unsigned long timeout;
3278
3279 if (!valid_lft || (prefered_lft > valid_lft))
3280 return -EINVAL;
3281
3282 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3283 if (addrconf_finite_timeout(timeout)) {
3284 expires = jiffies_to_clock_t(timeout * HZ);
3285 valid_lft = timeout;
3286 flags = RTF_EXPIRES;
3287 } else {
3288 expires = 0;
3289 flags = 0;
3290 ifa_flags |= IFA_F_PERMANENT;
3291 }
3292
3293 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3294 if (addrconf_finite_timeout(timeout)) {
3295 if (timeout == 0)
3296 ifa_flags |= IFA_F_DEPRECATED;
3297 prefered_lft = timeout;
3298 }
3299
3300 spin_lock_bh(&ifp->lock);
3301 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3302 ifp->tstamp = jiffies;
3303 ifp->valid_lft = valid_lft;
3304 ifp->prefered_lft = prefered_lft;
3305
3306 spin_unlock_bh(&ifp->lock);
3307 if (!(ifp->flags&IFA_F_TENTATIVE))
3308 ipv6_ifa_notify(0, ifp);
3309
3310 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3311 expires, flags);
3312 addrconf_verify(0);
3313
3314 return 0;
3315}
3316
3317static int
3318inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3319{
3320 struct net *net = sock_net(skb->sk);
3321 struct ifaddrmsg *ifm;
3322 struct nlattr *tb[IFA_MAX+1];
3323 struct in6_addr *pfx;
3324 struct inet6_ifaddr *ifa;
3325 struct net_device *dev;
3326 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3327 u8 ifa_flags;
3328 int err;
3329
3330 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3331 if (err < 0)
3332 return err;
3333
3334 ifm = nlmsg_data(nlh);
3335 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3336 if (pfx == NULL)
3337 return -EINVAL;
3338
3339 if (tb[IFA_CACHEINFO]) {
3340 struct ifa_cacheinfo *ci;
3341
3342 ci = nla_data(tb[IFA_CACHEINFO]);
3343 valid_lft = ci->ifa_valid;
3344 preferred_lft = ci->ifa_prefered;
3345 } else {
3346 preferred_lft = INFINITY_LIFE_TIME;
3347 valid_lft = INFINITY_LIFE_TIME;
3348 }
3349
3350 dev = __dev_get_by_index(net, ifm->ifa_index);
3351 if (dev == NULL)
3352 return -ENODEV;
3353
3354 /* We ignore other flags so far. */
3355 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3356
3357 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3358 if (ifa == NULL) {
3359 /*
3360 * It would be best to check for !NLM_F_CREATE here but
3361 * userspace alreay relies on not having to provide this.
3362 */
3363 return inet6_addr_add(net, ifm->ifa_index, pfx,
3364 ifm->ifa_prefixlen, ifa_flags,
3365 preferred_lft, valid_lft);
3366 }
3367
3368 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3369 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3370 err = -EEXIST;
3371 else
3372 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3373
3374 in6_ifa_put(ifa);
3375
3376 return err;
3377}
3378
3379static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3380 u8 scope, int ifindex)
3381{
3382 struct ifaddrmsg *ifm;
3383
3384 ifm = nlmsg_data(nlh);
3385 ifm->ifa_family = AF_INET6;
3386 ifm->ifa_prefixlen = prefixlen;
3387 ifm->ifa_flags = flags;
3388 ifm->ifa_scope = scope;
3389 ifm->ifa_index = ifindex;
3390}
3391
3392static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3393 unsigned long tstamp, u32 preferred, u32 valid)
3394{
3395 struct ifa_cacheinfo ci;
3396
3397 ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3398 + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3399 ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3400 + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3401 ci.ifa_prefered = preferred;
3402 ci.ifa_valid = valid;
3403
3404 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3405}
3406
3407static inline int rt_scope(int ifa_scope)
3408{
3409 if (ifa_scope & IFA_HOST)
3410 return RT_SCOPE_HOST;
3411 else if (ifa_scope & IFA_LINK)
3412 return RT_SCOPE_LINK;
3413 else if (ifa_scope & IFA_SITE)
3414 return RT_SCOPE_SITE;
3415 else
3416 return RT_SCOPE_UNIVERSE;
3417}
3418
3419static inline int inet6_ifaddr_msgsize(void)
3420{
3421 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3422 + nla_total_size(16) /* IFA_ADDRESS */
3423 + nla_total_size(sizeof(struct ifa_cacheinfo));
3424}
3425
3426static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3427 u32 pid, u32 seq, int event, unsigned int flags)
3428{
3429 struct nlmsghdr *nlh;
3430 u32 preferred, valid;
3431
3432 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3433 if (nlh == NULL)
3434 return -EMSGSIZE;
3435
3436 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3437 ifa->idev->dev->ifindex);
3438
3439 if (!(ifa->flags&IFA_F_PERMANENT)) {
3440 preferred = ifa->prefered_lft;
3441 valid = ifa->valid_lft;
3442 if (preferred != INFINITY_LIFE_TIME) {
3443 long tval = (jiffies - ifa->tstamp)/HZ;
3444 if (preferred > tval)
3445 preferred -= tval;
3446 else
3447 preferred = 0;
3448 if (valid != INFINITY_LIFE_TIME)
3449 valid -= tval;
3450 }
3451 } else {
3452 preferred = INFINITY_LIFE_TIME;
3453 valid = INFINITY_LIFE_TIME;
3454 }
3455
3456 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3457 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3458 nlmsg_cancel(skb, nlh);
3459 return -EMSGSIZE;
3460 }
3461
3462 return nlmsg_end(skb, nlh);
3463}
3464
3465static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3466 u32 pid, u32 seq, int event, u16 flags)
3467{
3468 struct nlmsghdr *nlh;
3469 u8 scope = RT_SCOPE_UNIVERSE;
3470 int ifindex = ifmca->idev->dev->ifindex;
3471
3472 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3473 scope = RT_SCOPE_SITE;
3474
3475 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3476 if (nlh == NULL)
3477 return -EMSGSIZE;
3478
3479 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3480 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3481 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3482 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3483 nlmsg_cancel(skb, nlh);
3484 return -EMSGSIZE;
3485 }
3486
3487 return nlmsg_end(skb, nlh);
3488}
3489
3490static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3491 u32 pid, u32 seq, int event, unsigned int flags)
3492{
3493 struct nlmsghdr *nlh;
3494 u8 scope = RT_SCOPE_UNIVERSE;
3495 int ifindex = ifaca->aca_idev->dev->ifindex;
3496
3497 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3498 scope = RT_SCOPE_SITE;
3499
3500 nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3501 if (nlh == NULL)
3502 return -EMSGSIZE;
3503
3504 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3505 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3506 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3507 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3508 nlmsg_cancel(skb, nlh);
3509 return -EMSGSIZE;
3510 }
3511
3512 return nlmsg_end(skb, nlh);
3513}
3514
3515enum addr_type_t {
3516 UNICAST_ADDR,
3517 MULTICAST_ADDR,
3518 ANYCAST_ADDR,
3519};
3520
3521/* called with rcu_read_lock() */
3522static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3523 struct netlink_callback *cb, enum addr_type_t type,
3524 int s_ip_idx, int *p_ip_idx)
3525{
3526 struct ifmcaddr6 *ifmca;
3527 struct ifacaddr6 *ifaca;
3528 int err = 1;
3529 int ip_idx = *p_ip_idx;
3530
3531 read_lock_bh(&idev->lock);
3532 switch (type) {
3533 case UNICAST_ADDR: {
3534 struct inet6_ifaddr *ifa;
3535
3536 /* unicast address incl. temp addr */
3537 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3538 if (++ip_idx < s_ip_idx)
3539 continue;
3540 err = inet6_fill_ifaddr(skb, ifa,
3541 NETLINK_CB(cb->skb).pid,
3542 cb->nlh->nlmsg_seq,
3543 RTM_NEWADDR,
3544 NLM_F_MULTI);
3545 if (err <= 0)
3546 break;
3547 }
3548 break;
3549 }
3550 case MULTICAST_ADDR:
3551 /* multicast address */
3552 for (ifmca = idev->mc_list; ifmca;
3553 ifmca = ifmca->next, ip_idx++) {
3554 if (ip_idx < s_ip_idx)
3555 continue;
3556 err = inet6_fill_ifmcaddr(skb, ifmca,
3557 NETLINK_CB(cb->skb).pid,
3558 cb->nlh->nlmsg_seq,
3559 RTM_GETMULTICAST,
3560 NLM_F_MULTI);
3561 if (err <= 0)
3562 break;
3563 }
3564 break;
3565 case ANYCAST_ADDR:
3566 /* anycast address */
3567 for (ifaca = idev->ac_list; ifaca;
3568 ifaca = ifaca->aca_next, ip_idx++) {
3569 if (ip_idx < s_ip_idx)
3570 continue;
3571 err = inet6_fill_ifacaddr(skb, ifaca,
3572 NETLINK_CB(cb->skb).pid,
3573 cb->nlh->nlmsg_seq,
3574 RTM_GETANYCAST,
3575 NLM_F_MULTI);
3576 if (err <= 0)
3577 break;
3578 }
3579 break;
3580 default:
3581 break;
3582 }
3583 read_unlock_bh(&idev->lock);
3584 *p_ip_idx = ip_idx;
3585 return err;
3586}
3587
3588static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3589 enum addr_type_t type)
3590{
3591 struct net *net = sock_net(skb->sk);
3592 int h, s_h;
3593 int idx, ip_idx;
3594 int s_idx, s_ip_idx;
3595 struct net_device *dev;
3596 struct inet6_dev *idev;
3597 struct hlist_head *head;
3598 struct hlist_node *node;
3599
3600 s_h = cb->args[0];
3601 s_idx = idx = cb->args[1];
3602 s_ip_idx = ip_idx = cb->args[2];
3603
3604 rcu_read_lock();
3605 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3606 idx = 0;
3607 head = &net->dev_index_head[h];
3608 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3609 if (idx < s_idx)
3610 goto cont;
3611 if (h > s_h || idx > s_idx)
3612 s_ip_idx = 0;
3613 ip_idx = 0;
3614 idev = __in6_dev_get(dev);
3615 if (!idev)
3616 goto cont;
3617
3618 if (in6_dump_addrs(idev, skb, cb, type,
3619 s_ip_idx, &ip_idx) <= 0)
3620 goto done;
3621cont:
3622 idx++;
3623 }
3624 }
3625done:
3626 rcu_read_unlock();
3627 cb->args[0] = h;
3628 cb->args[1] = idx;
3629 cb->args[2] = ip_idx;
3630
3631 return skb->len;
3632}
3633
3634static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3635{
3636 enum addr_type_t type = UNICAST_ADDR;
3637
3638 return inet6_dump_addr(skb, cb, type);
3639}
3640
3641static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3642{
3643 enum addr_type_t type = MULTICAST_ADDR;
3644
3645 return inet6_dump_addr(skb, cb, type);
3646}
3647
3648
3649static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3650{
3651 enum addr_type_t type = ANYCAST_ADDR;
3652
3653 return inet6_dump_addr(skb, cb, type);
3654}
3655
3656static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3657 void *arg)
3658{
3659 struct net *net = sock_net(in_skb->sk);
3660 struct ifaddrmsg *ifm;
3661 struct nlattr *tb[IFA_MAX+1];
3662 struct in6_addr *addr = NULL;
3663 struct net_device *dev = NULL;
3664 struct inet6_ifaddr *ifa;
3665 struct sk_buff *skb;
3666 int err;
3667
3668 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3669 if (err < 0)
3670 goto errout;
3671
3672 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3673 if (addr == NULL) {
3674 err = -EINVAL;
3675 goto errout;
3676 }
3677
3678 ifm = nlmsg_data(nlh);
3679 if (ifm->ifa_index)
3680 dev = __dev_get_by_index(net, ifm->ifa_index);
3681
3682 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3683 if (!ifa) {
3684 err = -EADDRNOTAVAIL;
3685 goto errout;
3686 }
3687
3688 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3689 if (!skb) {
3690 err = -ENOBUFS;
3691 goto errout_ifa;
3692 }
3693
3694 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3695 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3696 if (err < 0) {
3697 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3698 WARN_ON(err == -EMSGSIZE);
3699 kfree_skb(skb);
3700 goto errout_ifa;
3701 }
3702 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3703errout_ifa:
3704 in6_ifa_put(ifa);
3705errout:
3706 return err;
3707}
3708
3709static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3710{
3711 struct sk_buff *skb;
3712 struct net *net = dev_net(ifa->idev->dev);
3713 int err = -ENOBUFS;
3714
3715 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3716 if (skb == NULL)
3717 goto errout;
3718
3719 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3720 if (err < 0) {
3721 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3722 WARN_ON(err == -EMSGSIZE);
3723 kfree_skb(skb);
3724 goto errout;
3725 }
3726 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3727 return;
3728errout:
3729 if (err < 0)
3730 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3731}
3732
3733static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3734 __s32 *array, int bytes)
3735{
3736 BUG_ON(bytes < (DEVCONF_MAX * 4));
3737
3738 memset(array, 0, bytes);
3739 array[DEVCONF_FORWARDING] = cnf->forwarding;
3740 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3741 array[DEVCONF_MTU6] = cnf->mtu6;
3742 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3743 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3744 array[DEVCONF_AUTOCONF] = cnf->autoconf;
3745 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3746 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3747 array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3748 array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3749 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3750#ifdef CONFIG_IPV6_PRIVACY
3751 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3752 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3753 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3754 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3755 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3756#endif
3757 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3758 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3759 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3760#ifdef CONFIG_IPV6_ROUTER_PREF
3761 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3762 array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3763#ifdef CONFIG_IPV6_ROUTE_INFO
3764 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3765#endif
3766#endif
3767 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3768 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3769#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3770 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3771#endif
3772#ifdef CONFIG_IPV6_MROUTE
3773 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3774#endif
3775 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3776 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3777 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3778}
3779
3780static inline size_t inet6_if_nlmsg_size(void)
3781{
3782 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3783 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3784 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3785 + nla_total_size(4) /* IFLA_MTU */
3786 + nla_total_size(4) /* IFLA_LINK */
3787 + nla_total_size( /* IFLA_PROTINFO */
3788 nla_total_size(4) /* IFLA_INET6_FLAGS */
3789 + nla_total_size(sizeof(struct ifla_cacheinfo))
3790 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3791 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3792 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3793 );
3794}
3795
3796static inline void __snmp6_fill_stats(u64 *stats, void __percpu **mib,
3797 int items, int bytes)
3798{
3799 int i;
3800 int pad = bytes - sizeof(u64) * items;
3801 BUG_ON(pad < 0);
3802
3803 /* Use put_unaligned() because stats may not be aligned for u64. */
3804 put_unaligned(items, &stats[0]);
3805 for (i = 1; i < items; i++)
3806 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3807
3808 memset(&stats[items], 0, pad);
3809}
3810
3811static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3812 int bytes)
3813{
3814 switch (attrtype) {
3815 case IFLA_INET6_STATS:
3816 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3817 break;
3818 case IFLA_INET6_ICMP6STATS:
3819 __snmp6_fill_stats(stats, (void __percpu **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3820 break;
3821 }
3822}
3823
3824static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3825 u32 pid, u32 seq, int event, unsigned int flags)
3826{
3827 struct net_device *dev = idev->dev;
3828 struct nlattr *nla;
3829 struct ifinfomsg *hdr;
3830 struct nlmsghdr *nlh;
3831 void *protoinfo;
3832 struct ifla_cacheinfo ci;
3833
3834 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3835 if (nlh == NULL)
3836 return -EMSGSIZE;
3837
3838 hdr = nlmsg_data(nlh);
3839 hdr->ifi_family = AF_INET6;
3840 hdr->__ifi_pad = 0;
3841 hdr->ifi_type = dev->type;
3842 hdr->ifi_index = dev->ifindex;
3843 hdr->ifi_flags = dev_get_flags(dev);
3844 hdr->ifi_change = 0;
3845
3846 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3847
3848 if (dev->addr_len)
3849 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3850
3851 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3852 if (dev->ifindex != dev->iflink)
3853 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3854
3855 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3856 if (protoinfo == NULL)
3857 goto nla_put_failure;
3858
3859 NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3860
3861 ci.max_reasm_len = IPV6_MAXPLEN;
3862 ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3863 + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3864 ci.reachable_time = idev->nd_parms->reachable_time;
3865 ci.retrans_time = idev->nd_parms->retrans_time;
3866 NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3867
3868 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3869 if (nla == NULL)
3870 goto nla_put_failure;
3871 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3872
3873 /* XXX - MC not implemented */
3874
3875 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3876 if (nla == NULL)
3877 goto nla_put_failure;
3878 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3879
3880 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3881 if (nla == NULL)
3882 goto nla_put_failure;
3883 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3884
3885 nla_nest_end(skb, protoinfo);
3886 return nlmsg_end(skb, nlh);
3887
3888nla_put_failure:
3889 nlmsg_cancel(skb, nlh);
3890 return -EMSGSIZE;
3891}
3892
3893static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3894{
3895 struct net *net = sock_net(skb->sk);
3896 int h, s_h;
3897 int idx = 0, s_idx;
3898 struct net_device *dev;
3899 struct inet6_dev *idev;
3900 struct hlist_head *head;
3901 struct hlist_node *node;
3902
3903 s_h = cb->args[0];
3904 s_idx = cb->args[1];
3905
3906 rcu_read_lock();
3907 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3908 idx = 0;
3909 head = &net->dev_index_head[h];
3910 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3911 if (idx < s_idx)
3912 goto cont;
3913 idev = __in6_dev_get(dev);
3914 if (!idev)
3915 goto cont;
3916 if (inet6_fill_ifinfo(skb, idev,
3917 NETLINK_CB(cb->skb).pid,
3918 cb->nlh->nlmsg_seq,
3919 RTM_NEWLINK, NLM_F_MULTI) <= 0)
3920 goto out;
3921cont:
3922 idx++;
3923 }
3924 }
3925out:
3926 rcu_read_unlock();
3927 cb->args[1] = idx;
3928 cb->args[0] = h;
3929
3930 return skb->len;
3931}
3932
3933void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3934{
3935 struct sk_buff *skb;
3936 struct net *net = dev_net(idev->dev);
3937 int err = -ENOBUFS;
3938
3939 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3940 if (skb == NULL)
3941 goto errout;
3942
3943 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3944 if (err < 0) {
3945 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3946 WARN_ON(err == -EMSGSIZE);
3947 kfree_skb(skb);
3948 goto errout;
3949 }
3950 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3951 return;
3952errout:
3953 if (err < 0)
3954 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3955}
3956
3957static inline size_t inet6_prefix_nlmsg_size(void)
3958{
3959 return NLMSG_ALIGN(sizeof(struct prefixmsg))
3960 + nla_total_size(sizeof(struct in6_addr))
3961 + nla_total_size(sizeof(struct prefix_cacheinfo));
3962}
3963
3964static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3965 struct prefix_info *pinfo, u32 pid, u32 seq,
3966 int event, unsigned int flags)
3967{
3968 struct prefixmsg *pmsg;
3969 struct nlmsghdr *nlh;
3970 struct prefix_cacheinfo ci;
3971
3972 nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3973 if (nlh == NULL)
3974 return -EMSGSIZE;
3975
3976 pmsg = nlmsg_data(nlh);
3977 pmsg->prefix_family = AF_INET6;
3978 pmsg->prefix_pad1 = 0;
3979 pmsg->prefix_pad2 = 0;
3980 pmsg->prefix_ifindex = idev->dev->ifindex;
3981 pmsg->prefix_len = pinfo->prefix_len;
3982 pmsg->prefix_type = pinfo->type;
3983 pmsg->prefix_pad3 = 0;
3984 pmsg->prefix_flags = 0;
3985 if (pinfo->onlink)
3986 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3987 if (pinfo->autoconf)
3988 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3989
3990 NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3991
3992 ci.preferred_time = ntohl(pinfo->prefered);
3993 ci.valid_time = ntohl(pinfo->valid);
3994 NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3995
3996 return nlmsg_end(skb, nlh);
3997
3998nla_put_failure:
3999 nlmsg_cancel(skb, nlh);
4000 return -EMSGSIZE;
4001}
4002
4003static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4004 struct prefix_info *pinfo)
4005{
4006 struct sk_buff *skb;
4007 struct net *net = dev_net(idev->dev);
4008 int err = -ENOBUFS;
4009
4010 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4011 if (skb == NULL)
4012 goto errout;
4013
4014 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4015 if (err < 0) {
4016 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4017 WARN_ON(err == -EMSGSIZE);
4018 kfree_skb(skb);
4019 goto errout;
4020 }
4021 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4022 return;
4023errout:
4024 if (err < 0)
4025 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4026}
4027
4028static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4029{
4030 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4031
4032 switch (event) {
4033 case RTM_NEWADDR:
4034 /*
4035 * If the address was optimistic
4036 * we inserted the route at the start of
4037 * our DAD process, so we don't need
4038 * to do it again
4039 */
4040 if (!(ifp->rt->rt6i_node))
4041 ip6_ins_rt(ifp->rt);
4042 if (ifp->idev->cnf.forwarding)
4043 addrconf_join_anycast(ifp);
4044 break;
4045 case RTM_DELADDR:
4046 if (ifp->idev->cnf.forwarding)
4047 addrconf_leave_anycast(ifp);
4048 addrconf_leave_solict(ifp->idev, &ifp->addr);
4049 dst_hold(&ifp->rt->u.dst);
4050
4051 if (ifp->dead && ip6_del_rt(ifp->rt))
4052 dst_free(&ifp->rt->u.dst);
4053 break;
4054 }
4055}
4056
4057static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4058{
4059 rcu_read_lock_bh();
4060 if (likely(ifp->idev->dead == 0))
4061 __ipv6_ifa_notify(event, ifp);
4062 rcu_read_unlock_bh();
4063}
4064
4065#ifdef CONFIG_SYSCTL
4066
4067static
4068int addrconf_sysctl_forward(ctl_table *ctl, int write,
4069 void __user *buffer, size_t *lenp, loff_t *ppos)
4070{
4071 int *valp = ctl->data;
4072 int val = *valp;
4073 loff_t pos = *ppos;
4074 int ret;
4075
4076 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4077
4078 if (write)
4079 ret = addrconf_fixup_forwarding(ctl, valp, val);
4080 if (ret)
4081 *ppos = pos;
4082 return ret;
4083}
4084
4085static void dev_disable_change(struct inet6_dev *idev)
4086{
4087 if (!idev || !idev->dev)
4088 return;
4089
4090 if (idev->cnf.disable_ipv6)
4091 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4092 else
4093 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4094}
4095
4096static void addrconf_disable_change(struct net *net, __s32 newf)
4097{
4098 struct net_device *dev;
4099 struct inet6_dev *idev;
4100
4101 rcu_read_lock();
4102 for_each_netdev_rcu(net, dev) {
4103 idev = __in6_dev_get(dev);
4104 if (idev) {
4105 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4106 idev->cnf.disable_ipv6 = newf;
4107 if (changed)
4108 dev_disable_change(idev);
4109 }
4110 }
4111 rcu_read_unlock();
4112}
4113
4114static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4115{
4116 struct net *net;
4117
4118 net = (struct net *)table->extra2;
4119
4120 if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4121 return 0;
4122
4123 if (!rtnl_trylock()) {
4124 /* Restore the original values before restarting */
4125 *p = old;
4126 return restart_syscall();
4127 }
4128
4129 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4130 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4131 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4132 addrconf_disable_change(net, newf);
4133 } else if ((!*p) ^ (!old))
4134 dev_disable_change((struct inet6_dev *)table->extra1);
4135
4136 rtnl_unlock();
4137 return 0;
4138}
4139
4140static
4141int addrconf_sysctl_disable(ctl_table *ctl, int write,
4142 void __user *buffer, size_t *lenp, loff_t *ppos)
4143{
4144 int *valp = ctl->data;
4145 int val = *valp;
4146 loff_t pos = *ppos;
4147 int ret;
4148
4149 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4150
4151 if (write)
4152 ret = addrconf_disable_ipv6(ctl, valp, val);
4153 if (ret)
4154 *ppos = pos;
4155 return ret;
4156}
4157
4158static struct addrconf_sysctl_table
4159{
4160 struct ctl_table_header *sysctl_header;
4161 ctl_table addrconf_vars[DEVCONF_MAX+1];
4162 char *dev_name;
4163} addrconf_sysctl __read_mostly = {
4164 .sysctl_header = NULL,
4165 .addrconf_vars = {
4166 {
4167 .procname = "forwarding",
4168 .data = &ipv6_devconf.forwarding,
4169 .maxlen = sizeof(int),
4170 .mode = 0644,
4171 .proc_handler = addrconf_sysctl_forward,
4172 },
4173 {
4174 .procname = "hop_limit",
4175 .data = &ipv6_devconf.hop_limit,
4176 .maxlen = sizeof(int),
4177 .mode = 0644,
4178 .proc_handler = proc_dointvec,
4179 },
4180 {
4181 .procname = "mtu",
4182 .data = &ipv6_devconf.mtu6,
4183 .maxlen = sizeof(int),
4184 .mode = 0644,
4185 .proc_handler = proc_dointvec,
4186 },
4187 {
4188 .procname = "accept_ra",
4189 .data = &ipv6_devconf.accept_ra,
4190 .maxlen = sizeof(int),
4191 .mode = 0644,
4192 .proc_handler = proc_dointvec,
4193 },
4194 {
4195 .procname = "accept_redirects",
4196 .data = &ipv6_devconf.accept_redirects,
4197 .maxlen = sizeof(int),
4198 .mode = 0644,
4199 .proc_handler = proc_dointvec,
4200 },
4201 {
4202 .procname = "autoconf",
4203 .data = &ipv6_devconf.autoconf,
4204 .maxlen = sizeof(int),
4205 .mode = 0644,
4206 .proc_handler = proc_dointvec,
4207 },
4208 {
4209 .procname = "dad_transmits",
4210 .data = &ipv6_devconf.dad_transmits,
4211 .maxlen = sizeof(int),
4212 .mode = 0644,
4213 .proc_handler = proc_dointvec,
4214 },
4215 {
4216 .procname = "router_solicitations",
4217 .data = &ipv6_devconf.rtr_solicits,
4218 .maxlen = sizeof(int),
4219 .mode = 0644,
4220 .proc_handler = proc_dointvec,
4221 },
4222 {
4223 .procname = "router_solicitation_interval",
4224 .data = &ipv6_devconf.rtr_solicit_interval,
4225 .maxlen = sizeof(int),
4226 .mode = 0644,
4227 .proc_handler = proc_dointvec_jiffies,
4228 },
4229 {
4230 .procname = "router_solicitation_delay",
4231 .data = &ipv6_devconf.rtr_solicit_delay,
4232 .maxlen = sizeof(int),
4233 .mode = 0644,
4234 .proc_handler = proc_dointvec_jiffies,
4235 },
4236 {
4237 .procname = "force_mld_version",
4238 .data = &ipv6_devconf.force_mld_version,
4239 .maxlen = sizeof(int),
4240 .mode = 0644,
4241 .proc_handler = proc_dointvec,
4242 },
4243#ifdef CONFIG_IPV6_PRIVACY
4244 {
4245 .procname = "use_tempaddr",
4246 .data = &ipv6_devconf.use_tempaddr,
4247 .maxlen = sizeof(int),
4248 .mode = 0644,
4249 .proc_handler = proc_dointvec,
4250 },
4251 {
4252 .procname = "temp_valid_lft",
4253 .data = &ipv6_devconf.temp_valid_lft,
4254 .maxlen = sizeof(int),
4255 .mode = 0644,
4256 .proc_handler = proc_dointvec,
4257 },
4258 {
4259 .procname = "temp_prefered_lft",
4260 .data = &ipv6_devconf.temp_prefered_lft,
4261 .maxlen = sizeof(int),
4262 .mode = 0644,
4263 .proc_handler = proc_dointvec,
4264 },
4265 {
4266 .procname = "regen_max_retry",
4267 .data = &ipv6_devconf.regen_max_retry,
4268 .maxlen = sizeof(int),
4269 .mode = 0644,
4270 .proc_handler = proc_dointvec,
4271 },
4272 {
4273 .procname = "max_desync_factor",
4274 .data = &ipv6_devconf.max_desync_factor,
4275 .maxlen = sizeof(int),
4276 .mode = 0644,
4277 .proc_handler = proc_dointvec,
4278 },
4279#endif
4280 {
4281 .procname = "max_addresses",
4282 .data = &ipv6_devconf.max_addresses,
4283 .maxlen = sizeof(int),
4284 .mode = 0644,
4285 .proc_handler = proc_dointvec,
4286 },
4287 {
4288 .procname = "accept_ra_defrtr",
4289 .data = &ipv6_devconf.accept_ra_defrtr,
4290 .maxlen = sizeof(int),
4291 .mode = 0644,
4292 .proc_handler = proc_dointvec,
4293 },
4294 {
4295 .procname = "accept_ra_pinfo",
4296 .data = &ipv6_devconf.accept_ra_pinfo,
4297 .maxlen = sizeof(int),
4298 .mode = 0644,
4299 .proc_handler = proc_dointvec,
4300 },
4301#ifdef CONFIG_IPV6_ROUTER_PREF
4302 {
4303 .procname = "accept_ra_rtr_pref",
4304 .data = &ipv6_devconf.accept_ra_rtr_pref,
4305 .maxlen = sizeof(int),
4306 .mode = 0644,
4307 .proc_handler = proc_dointvec,
4308 },
4309 {
4310 .procname = "router_probe_interval",
4311 .data = &ipv6_devconf.rtr_probe_interval,
4312 .maxlen = sizeof(int),
4313 .mode = 0644,
4314 .proc_handler = proc_dointvec_jiffies,
4315 },
4316#ifdef CONFIG_IPV6_ROUTE_INFO
4317 {
4318 .procname = "accept_ra_rt_info_max_plen",
4319 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4320 .maxlen = sizeof(int),
4321 .mode = 0644,
4322 .proc_handler = proc_dointvec,
4323 },
4324#endif
4325#endif
4326 {
4327 .procname = "proxy_ndp",
4328 .data = &ipv6_devconf.proxy_ndp,
4329 .maxlen = sizeof(int),
4330 .mode = 0644,
4331 .proc_handler = proc_dointvec,
4332 },
4333 {
4334 .procname = "accept_source_route",
4335 .data = &ipv6_devconf.accept_source_route,
4336 .maxlen = sizeof(int),
4337 .mode = 0644,
4338 .proc_handler = proc_dointvec,
4339 },
4340#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4341 {
4342 .procname = "optimistic_dad",
4343 .data = &ipv6_devconf.optimistic_dad,
4344 .maxlen = sizeof(int),
4345 .mode = 0644,
4346 .proc_handler = proc_dointvec,
4347
4348 },
4349#endif
4350#ifdef CONFIG_IPV6_MROUTE
4351 {
4352 .procname = "mc_forwarding",
4353 .data = &ipv6_devconf.mc_forwarding,
4354 .maxlen = sizeof(int),
4355 .mode = 0444,
4356 .proc_handler = proc_dointvec,
4357 },
4358#endif
4359 {
4360 .procname = "disable_ipv6",
4361 .data = &ipv6_devconf.disable_ipv6,
4362 .maxlen = sizeof(int),
4363 .mode = 0644,
4364 .proc_handler = addrconf_sysctl_disable,
4365 },
4366 {
4367 .procname = "accept_dad",
4368 .data = &ipv6_devconf.accept_dad,
4369 .maxlen = sizeof(int),
4370 .mode = 0644,
4371 .proc_handler = proc_dointvec,
4372 },
4373 {
4374 .procname = "force_tllao",
4375 .data = &ipv6_devconf.force_tllao,
4376 .maxlen = sizeof(int),
4377 .mode = 0644,
4378 .proc_handler = proc_dointvec
4379 },
4380 {
4381 /* sentinel */
4382 }
4383 },
4384};
4385
4386static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4387 struct inet6_dev *idev, struct ipv6_devconf *p)
4388{
4389 int i;
4390 struct addrconf_sysctl_table *t;
4391
4392#define ADDRCONF_CTL_PATH_DEV 3
4393
4394 struct ctl_path addrconf_ctl_path[] = {
4395 { .procname = "net", },
4396 { .procname = "ipv6", },
4397 { .procname = "conf", },
4398 { /* to be set */ },
4399 { },
4400 };
4401
4402
4403 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4404 if (t == NULL)
4405 goto out;
4406
4407 for (i = 0; t->addrconf_vars[i].data; i++) {
4408 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4409 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4410 t->addrconf_vars[i].extra2 = net;
4411 }
4412
4413 /*
4414 * Make a copy of dev_name, because '.procname' is regarded as const
4415 * by sysctl and we wouldn't want anyone to change it under our feet
4416 * (see SIOCSIFNAME).
4417 */
4418 t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4419 if (!t->dev_name)
4420 goto free;
4421
4422 addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4423
4424 t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4425 t->addrconf_vars);
4426 if (t->sysctl_header == NULL)
4427 goto free_procname;
4428
4429 p->sysctl = t;
4430 return 0;
4431
4432free_procname:
4433 kfree(t->dev_name);
4434free:
4435 kfree(t);
4436out:
4437 return -ENOBUFS;
4438}
4439
4440static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4441{
4442 struct addrconf_sysctl_table *t;
4443
4444 if (p->sysctl == NULL)
4445 return;
4446
4447 t = p->sysctl;
4448 p->sysctl = NULL;
4449 unregister_sysctl_table(t->sysctl_header);
4450 kfree(t->dev_name);
4451 kfree(t);
4452}
4453
4454static void addrconf_sysctl_register(struct inet6_dev *idev)
4455{
4456 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4457 &ndisc_ifinfo_sysctl_change);
4458 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4459 idev, &idev->cnf);
4460}
4461
4462static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4463{
4464 __addrconf_sysctl_unregister(&idev->cnf);
4465 neigh_sysctl_unregister(idev->nd_parms);
4466}
4467
4468
4469#endif
4470
4471static int __net_init addrconf_init_net(struct net *net)
4472{
4473 int err;
4474 struct ipv6_devconf *all, *dflt;
4475
4476 err = -ENOMEM;
4477 all = &ipv6_devconf;
4478 dflt = &ipv6_devconf_dflt;
4479
4480 if (!net_eq(net, &init_net)) {
4481 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4482 if (all == NULL)
4483 goto err_alloc_all;
4484
4485 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4486 if (dflt == NULL)
4487 goto err_alloc_dflt;
4488 } else {
4489 /* these will be inherited by all namespaces */
4490 dflt->autoconf = ipv6_defaults.autoconf;
4491 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4492 }
4493
4494 net->ipv6.devconf_all = all;
4495 net->ipv6.devconf_dflt = dflt;
4496
4497#ifdef CONFIG_SYSCTL
4498 err = __addrconf_sysctl_register(net, "all", NULL, all);
4499 if (err < 0)
4500 goto err_reg_all;
4501
4502 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4503 if (err < 0)
4504 goto err_reg_dflt;
4505#endif
4506 return 0;
4507
4508#ifdef CONFIG_SYSCTL
4509err_reg_dflt:
4510 __addrconf_sysctl_unregister(all);
4511err_reg_all:
4512 kfree(dflt);
4513#endif
4514err_alloc_dflt:
4515 kfree(all);
4516err_alloc_all:
4517 return err;
4518}
4519
4520static void __net_exit addrconf_exit_net(struct net *net)
4521{
4522#ifdef CONFIG_SYSCTL
4523 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4524 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4525#endif
4526 if (!net_eq(net, &init_net)) {
4527 kfree(net->ipv6.devconf_dflt);
4528 kfree(net->ipv6.devconf_all);
4529 }
4530}
4531
4532static struct pernet_operations addrconf_ops = {
4533 .init = addrconf_init_net,
4534 .exit = addrconf_exit_net,
4535};
4536
4537/*
4538 * Device notifier
4539 */
4540
4541int register_inet6addr_notifier(struct notifier_block *nb)
4542{
4543 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4544}
4545EXPORT_SYMBOL(register_inet6addr_notifier);
4546
4547int unregister_inet6addr_notifier(struct notifier_block *nb)
4548{
4549 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4550}
4551EXPORT_SYMBOL(unregister_inet6addr_notifier);
4552
4553/*
4554 * Init / cleanup code
4555 */
4556
4557int __init addrconf_init(void)
4558{
4559 int i, err;
4560
4561 err = ipv6_addr_label_init();
4562 if (err < 0) {
4563 printk(KERN_CRIT "IPv6 Addrconf:"
4564 " cannot initialize default policy table: %d.\n", err);
4565 return err;
4566 }
4567
4568 register_pernet_subsys(&addrconf_ops);
4569
4570 /* The addrconf netdev notifier requires that loopback_dev
4571 * has it's ipv6 private information allocated and setup
4572 * before it can bring up and give link-local addresses
4573 * to other devices which are up.
4574 *
4575 * Unfortunately, loopback_dev is not necessarily the first
4576 * entry in the global dev_base list of net devices. In fact,
4577 * it is likely to be the very last entry on that list.
4578 * So this causes the notifier registry below to try and
4579 * give link-local addresses to all devices besides loopback_dev
4580 * first, then loopback_dev, which cases all the non-loopback_dev
4581 * devices to fail to get a link-local address.
4582 *
4583 * So, as a temporary fix, allocate the ipv6 structure for
4584 * loopback_dev first by hand.
4585 * Longer term, all of the dependencies ipv6 has upon the loopback
4586 * device and it being up should be removed.
4587 */
4588 rtnl_lock();
4589 if (!ipv6_add_dev(init_net.loopback_dev))
4590 err = -ENOMEM;
4591 rtnl_unlock();
4592 if (err)
4593 goto errlo;
4594
4595 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4596 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4597
4598 register_netdevice_notifier(&ipv6_dev_notf);
4599
4600 addrconf_verify(0);
4601
4602 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4603 if (err < 0)
4604 goto errout;
4605
4606 /* Only the first call to __rtnl_register can fail */
4607 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4608 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4609 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4610 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4611 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4612
4613 ipv6_addr_label_rtnl_register();
4614
4615 return 0;
4616errout:
4617 unregister_netdevice_notifier(&ipv6_dev_notf);
4618errlo:
4619 unregister_pernet_subsys(&addrconf_ops);
4620
4621 return err;
4622}
4623
4624void addrconf_cleanup(void)
4625{
4626 struct net_device *dev;
4627 int i;
4628
4629 unregister_netdevice_notifier(&ipv6_dev_notf);
4630 unregister_pernet_subsys(&addrconf_ops);
4631
4632 rtnl_lock();
4633
4634 /* clean dev list */
4635 for_each_netdev(&init_net, dev) {
4636 if (__in6_dev_get(dev) == NULL)
4637 continue;
4638 addrconf_ifdown(dev, 1);
4639 }
4640 addrconf_ifdown(init_net.loopback_dev, 2);
4641
4642 /*
4643 * Check hash table.
4644 */
4645 spin_lock_bh(&addrconf_hash_lock);
4646 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4647 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4648 spin_unlock_bh(&addrconf_hash_lock);
4649
4650 del_timer(&addr_chk_timer);
4651 rtnl_unlock();
4652}
Linux 6.x block layer and io_uring tree(s)