Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
addrconf.c
Go to the documentation of this file.
1 /*
2  * IPv6 Address [auto]configuration
3  * Linux INET6 implementation
4  *
5  * Authors:
6  * Pedro Roque <[email protected]>
7  * Alexey Kuznetsov <[email protected]>
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  * <[email protected]>
20  * Andi Kleen : kill double kfree on module
21  * unload.
22  * Maciej W. Rozycki : FDDI support
23  * sekiya@USAGI : Don't send too many RS
24  * packets.
25  * yoshfuji@USAGI : Fixed interval between DAD
26  * packets.
27  * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28  * address validation timer.
29  * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30  * support.
31  * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32  * address on a same interface.
33  * YOSHIFUJI Hideaki @USAGI : ARCnet support
34  * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35  * seq_file.
36  * YOSHIFUJI Hideaki @USAGI : improved source address
37  * selection; consider scope,
38  * status etc.
39  */
40 
41 #define pr_fmt(fmt) "IPv6: " fmt
42 
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #include <linux/slab.h>
59 #ifdef CONFIG_SYSCTL
60 #include <linux/sysctl.h>
61 #endif
62 #include <linux/capability.h>
63 #include <linux/delay.h>
64 #include <linux/notifier.h>
65 #include <linux/string.h>
66 #include <linux/hash.h>
67 
68 #include <net/net_namespace.h>
69 #include <net/sock.h>
70 #include <net/snmp.h>
71 
72 #include <net/af_ieee802154.h>
73 #include <net/ipv6.h>
74 #include <net/protocol.h>
75 #include <net/ndisc.h>
76 #include <net/ip6_route.h>
77 #include <net/addrconf.h>
78 #include <net/tcp.h>
79 #include <net/ip.h>
80 #include <net/netlink.h>
81 #include <net/pkt_sched.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 
85 #ifdef CONFIG_IPV6_PRIVACY
86 #include <linux/random.h>
87 #endif
88 
89 #include <linux/uaccess.h>
90 #include <asm/unaligned.h>
91 
92 #include <linux/proc_fs.h>
93 #include <linux/seq_file.h>
94 #include <linux/export.h>
95 
96 /* Set to 3 to get tracing... */
97 #define ACONF_DEBUG 2
98 
99 #if ACONF_DEBUG >= 3
100 #define ADBG(x) printk x
101 #else
102 #define ADBG(x)
103 #endif
104 
105 #define INFINITY_LIFE_TIME 0xFFFFFFFF
106 
107 static inline u32 cstamp_delta(unsigned long cstamp)
108 {
109  return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
110 }
111 
112 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
113 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
114 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
115 
116 #ifdef CONFIG_SYSCTL
117 static void addrconf_sysctl_register(struct inet6_dev *idev);
118 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
119 #else
120 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
121 {
122 }
123 
124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125 {
126 }
127 #endif
128 
129 #ifdef CONFIG_IPV6_PRIVACY
130 static void __ipv6_regen_rndid(struct inet6_dev *idev);
131 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
132 static void ipv6_regen_rndid(unsigned long data);
133 #endif
134 
135 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
136 static int ipv6_count_addresses(struct inet6_dev *idev);
137 
138 /*
139  * Configured unicast address hash table
140  */
141 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
142 static DEFINE_SPINLOCK(addrconf_hash_lock);
143 
144 static void addrconf_verify(unsigned long);
145 
146 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
147 static DEFINE_SPINLOCK(addrconf_verify_lock);
148 
149 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
150 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
151 
152 static void addrconf_type_change(struct net_device *dev,
153  unsigned long event);
154 static int addrconf_ifdown(struct net_device *dev, int how);
155 
156 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
157 static void addrconf_dad_timer(unsigned long data);
158 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
159 static void addrconf_dad_run(struct inet6_dev *idev);
160 static void addrconf_rs_timer(unsigned long data);
161 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
162 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
163 
164 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
165  struct prefix_info *pinfo);
166 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
167  struct net_device *dev);
168 
169 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
170 
171 static struct ipv6_devconf ipv6_devconf __read_mostly = {
172  .forwarding = 0,
173  .hop_limit = IPV6_DEFAULT_HOPLIMIT,
174  .mtu6 = IPV6_MIN_MTU,
175  .accept_ra = 1,
176  .accept_redirects = 1,
177  .autoconf = 1,
178  .force_mld_version = 0,
179  .dad_transmits = 1,
180  .rtr_solicits = MAX_RTR_SOLICITATIONS,
181  .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
182  .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
183 #ifdef CONFIG_IPV6_PRIVACY
184  .use_tempaddr = 0,
185  .temp_valid_lft = TEMP_VALID_LIFETIME,
186  .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
187  .regen_max_retry = REGEN_MAX_RETRY,
188  .max_desync_factor = MAX_DESYNC_FACTOR,
189 #endif
190  .max_addresses = IPV6_MAX_ADDRESSES,
191  .accept_ra_defrtr = 1,
192  .accept_ra_pinfo = 1,
193 #ifdef CONFIG_IPV6_ROUTER_PREF
194  .accept_ra_rtr_pref = 1,
195  .rtr_probe_interval = 60 * HZ,
196 #ifdef CONFIG_IPV6_ROUTE_INFO
197  .accept_ra_rt_info_max_plen = 0,
198 #endif
199 #endif
200  .proxy_ndp = 0,
201  .accept_source_route = 0, /* we do not accept RH0 by default. */
202  .disable_ipv6 = 0,
203  .accept_dad = 1,
204 };
205 
206 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
207  .forwarding = 0,
208  .hop_limit = IPV6_DEFAULT_HOPLIMIT,
209  .mtu6 = IPV6_MIN_MTU,
210  .accept_ra = 1,
211  .accept_redirects = 1,
212  .autoconf = 1,
213  .dad_transmits = 1,
214  .rtr_solicits = MAX_RTR_SOLICITATIONS,
215  .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
216  .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
217 #ifdef CONFIG_IPV6_PRIVACY
218  .use_tempaddr = 0,
219  .temp_valid_lft = TEMP_VALID_LIFETIME,
220  .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
221  .regen_max_retry = REGEN_MAX_RETRY,
222  .max_desync_factor = MAX_DESYNC_FACTOR,
223 #endif
224  .max_addresses = IPV6_MAX_ADDRESSES,
225  .accept_ra_defrtr = 1,
226  .accept_ra_pinfo = 1,
227 #ifdef CONFIG_IPV6_ROUTER_PREF
228  .accept_ra_rtr_pref = 1,
229  .rtr_probe_interval = 60 * HZ,
230 #ifdef CONFIG_IPV6_ROUTE_INFO
231  .accept_ra_rt_info_max_plen = 0,
232 #endif
233 #endif
234  .proxy_ndp = 0,
235  .accept_source_route = 0, /* we do not accept RH0 by default. */
236  .disable_ipv6 = 0,
237  .accept_dad = 1,
238 };
239 
240 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
241 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
242 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
243 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
244 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
245 
246 /* Check if a valid qdisc is available */
247 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
248 {
249  return !qdisc_tx_is_noop(dev);
250 }
251 
252 /* Check if a route is valid prefix route */
253 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
254 {
255  return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
256 }
257 
258 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
259 {
260  if (del_timer(&ifp->timer))
261  __in6_ifa_put(ifp);
262 }
263 
264 enum addrconf_timer_t {
265  AC_NONE,
266  AC_DAD,
267  AC_RS,
268 };
269 
270 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
271  enum addrconf_timer_t what,
272  unsigned long when)
273 {
274  if (!del_timer(&ifp->timer))
275  in6_ifa_hold(ifp);
276 
277  switch (what) {
278  case AC_DAD:
279  ifp->timer.function = addrconf_dad_timer;
280  break;
281  case AC_RS:
282  ifp->timer.function = addrconf_rs_timer;
283  break;
284  default:
285  break;
286  }
287  ifp->timer.expires = jiffies + when;
288  add_timer(&ifp->timer);
289 }
290 
291 static int snmp6_alloc_dev(struct inet6_dev *idev)
292 {
293  if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
294  sizeof(struct ipstats_mib),
295  __alignof__(struct ipstats_mib)) < 0)
296  goto err_ip;
297  idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
298  GFP_KERNEL);
299  if (!idev->stats.icmpv6dev)
300  goto err_icmp;
301  idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
302  GFP_KERNEL);
303  if (!idev->stats.icmpv6msgdev)
304  goto err_icmpmsg;
305 
306  return 0;
307 
308 err_icmpmsg:
309  kfree(idev->stats.icmpv6dev);
310 err_icmp:
311  snmp_mib_free((void __percpu **)idev->stats.ipv6);
312 err_ip:
313  return -ENOMEM;
314 }
315 
316 static void snmp6_free_dev(struct inet6_dev *idev)
317 {
318  kfree(idev->stats.icmpv6msgdev);
319  kfree(idev->stats.icmpv6dev);
320  snmp_mib_free((void __percpu **)idev->stats.ipv6);
321 }
322 
323 /* Nobody refers to this device, we may destroy it. */
324 
325 void in6_dev_finish_destroy(struct inet6_dev *idev)
326 {
327  struct net_device *dev = idev->dev;
328 
329  WARN_ON(!list_empty(&idev->addr_list));
330  WARN_ON(idev->mc_list != NULL);
331 
332 #ifdef NET_REFCNT_DEBUG
333  pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
334 #endif
335  dev_put(dev);
336  if (!idev->dead) {
337  pr_warn("Freeing alive inet6 device %p\n", idev);
338  return;
339  }
340  snmp6_free_dev(idev);
341  kfree_rcu(idev, rcu);
342 }
343 EXPORT_SYMBOL(in6_dev_finish_destroy);
344 
345 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
346 {
347  struct inet6_dev *ndev;
348 
349  ASSERT_RTNL();
350 
351  if (dev->mtu < IPV6_MIN_MTU)
352  return NULL;
353 
354  ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
355 
356  if (ndev == NULL)
357  return NULL;
358 
359  rwlock_init(&ndev->lock);
360  ndev->dev = dev;
361  INIT_LIST_HEAD(&ndev->addr_list);
362 
363  memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
364  ndev->cnf.mtu6 = dev->mtu;
365  ndev->cnf.sysctl = NULL;
366  ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
367  if (ndev->nd_parms == NULL) {
368  kfree(ndev);
369  return NULL;
370  }
371  if (ndev->cnf.forwarding)
372  dev_disable_lro(dev);
373  /* We refer to the device */
374  dev_hold(dev);
375 
376  if (snmp6_alloc_dev(ndev) < 0) {
377  ADBG((KERN_WARNING
378  "%s: cannot allocate memory for statistics; dev=%s.\n",
379  __func__, dev->name));
380  neigh_parms_release(&nd_tbl, ndev->nd_parms);
381  dev_put(dev);
382  kfree(ndev);
383  return NULL;
384  }
385 
386  if (snmp6_register_dev(ndev) < 0) {
387  ADBG((KERN_WARNING
388  "%s: cannot create /proc/net/dev_snmp6/%s\n",
389  __func__, dev->name));
390  neigh_parms_release(&nd_tbl, ndev->nd_parms);
391  ndev->dead = 1;
392  in6_dev_finish_destroy(ndev);
393  return NULL;
394  }
395 
396  /* One reference from device. We must do this before
397  * we invoke __ipv6_regen_rndid().
398  */
399  in6_dev_hold(ndev);
400 
401  if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
402  ndev->cnf.accept_dad = -1;
403 
404 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
405  if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
406  pr_info("%s: Disabled Multicast RS\n", dev->name);
407  ndev->cnf.rtr_solicits = 0;
408  }
409 #endif
410 
411 #ifdef CONFIG_IPV6_PRIVACY
412  INIT_LIST_HEAD(&ndev->tempaddr_list);
413  setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
414  if ((dev->flags&IFF_LOOPBACK) ||
415  dev->type == ARPHRD_TUNNEL ||
416  dev->type == ARPHRD_TUNNEL6 ||
417  dev->type == ARPHRD_SIT ||
418  dev->type == ARPHRD_NONE) {
419  ndev->cnf.use_tempaddr = -1;
420  } else {
421  in6_dev_hold(ndev);
422  ipv6_regen_rndid((unsigned long) ndev);
423  }
424 #endif
425 
426  if (netif_running(dev) && addrconf_qdisc_ok(dev))
427  ndev->if_flags |= IF_READY;
428 
429  ipv6_mc_init_dev(ndev);
430  ndev->tstamp = jiffies;
431  addrconf_sysctl_register(ndev);
432  /* protected by rtnl_lock */
433  rcu_assign_pointer(dev->ip6_ptr, ndev);
434 
435  /* Join all-node multicast group */
436  ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
437 
438  /* Join all-router multicast group if forwarding is set */
439  if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
440  ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
441 
442  return ndev;
443 }
444 
445 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
446 {
447  struct inet6_dev *idev;
448 
449  ASSERT_RTNL();
450 
451  idev = __in6_dev_get(dev);
452  if (!idev) {
453  idev = ipv6_add_dev(dev);
454  if (!idev)
455  return NULL;
456  }
457 
458  if (dev->flags&IFF_UP)
459  ipv6_mc_up(idev);
460  return idev;
461 }
462 
463 #ifdef CONFIG_SYSCTL
464 static void dev_forward_change(struct inet6_dev *idev)
465 {
466  struct net_device *dev;
467  struct inet6_ifaddr *ifa;
468 
469  if (!idev)
470  return;
471  dev = idev->dev;
472  if (idev->cnf.forwarding)
473  dev_disable_lro(dev);
474  if (dev && (dev->flags & IFF_MULTICAST)) {
475  if (idev->cnf.forwarding)
476  ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477  else
478  ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
479  }
480 
481  list_for_each_entry(ifa, &idev->addr_list, if_list) {
482  if (ifa->flags&IFA_F_TENTATIVE)
483  continue;
484  if (idev->cnf.forwarding)
485  addrconf_join_anycast(ifa);
486  else
487  addrconf_leave_anycast(ifa);
488  }
489 }
490 
491 
492 static void addrconf_forward_change(struct net *net, __s32 newf)
493 {
494  struct net_device *dev;
495  struct inet6_dev *idev;
496 
497  for_each_netdev(net, dev) {
498  idev = __in6_dev_get(dev);
499  if (idev) {
500  int changed = (!idev->cnf.forwarding) ^ (!newf);
501  idev->cnf.forwarding = newf;
502  if (changed)
503  dev_forward_change(idev);
504  }
505  }
506 }
507 
508 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
509 {
510  struct net *net;
511  int old;
512 
513  if (!rtnl_trylock())
514  return restart_syscall();
515 
516  net = (struct net *)table->extra2;
517  old = *p;
518  *p = newf;
519 
520  if (p == &net->ipv6.devconf_dflt->forwarding) {
521  rtnl_unlock();
522  return 0;
523  }
524 
525  if (p == &net->ipv6.devconf_all->forwarding) {
526  net->ipv6.devconf_dflt->forwarding = newf;
527  addrconf_forward_change(net, newf);
528  } else if ((!newf) ^ (!old))
529  dev_forward_change((struct inet6_dev *)table->extra1);
530  rtnl_unlock();
531 
532  if (newf)
533  rt6_purge_dflt_routers(net);
534  return 1;
535 }
536 #endif
537 
538 /* Nobody refers to this ifaddr, destroy it */
539 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
540 {
541  WARN_ON(!hlist_unhashed(&ifp->addr_lst));
542 
543 #ifdef NET_REFCNT_DEBUG
544  pr_debug("%s\n", __func__);
545 #endif
546 
547  in6_dev_put(ifp->idev);
548 
549  if (del_timer(&ifp->timer))
550  pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
551 
552  if (ifp->state != INET6_IFADDR_STATE_DEAD) {
553  pr_warn("Freeing alive inet6 address %p\n", ifp);
554  return;
555  }
556  dst_release(&ifp->rt->dst);
557 
558  kfree_rcu(ifp, rcu);
559 }
560 
561 static void
562 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
563 {
564  struct list_head *p;
565  int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
566 
567  /*
568  * Each device address list is sorted in order of scope -
569  * global before linklocal.
570  */
571  list_for_each(p, &idev->addr_list) {
572  struct inet6_ifaddr *ifa
573  = list_entry(p, struct inet6_ifaddr, if_list);
574  if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
575  break;
576  }
577 
578  list_add_tail(&ifp->if_list, p);
579 }
580 
581 static u32 inet6_addr_hash(const struct in6_addr *addr)
582 {
583  return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
584 }
585 
586 /* On success it returns ifp with increased reference count */
587 
588 static struct inet6_ifaddr *
589 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
590  int scope, u32 flags)
591 {
592  struct inet6_ifaddr *ifa = NULL;
593  struct rt6_info *rt;
594  unsigned int hash;
595  int err = 0;
596  int addr_type = ipv6_addr_type(addr);
597 
598  if (addr_type == IPV6_ADDR_ANY ||
599  addr_type & IPV6_ADDR_MULTICAST ||
600  (!(idev->dev->flags & IFF_LOOPBACK) &&
601  addr_type & IPV6_ADDR_LOOPBACK))
602  return ERR_PTR(-EADDRNOTAVAIL);
603 
604  rcu_read_lock_bh();
605  if (idev->dead) {
606  err = -ENODEV; /*XXX*/
607  goto out2;
608  }
609 
610  if (idev->cnf.disable_ipv6) {
611  err = -EACCES;
612  goto out2;
613  }
614 
615  spin_lock(&addrconf_hash_lock);
616 
617  /* Ignore adding duplicate addresses on an interface */
618  if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
619  ADBG(("ipv6_add_addr: already assigned\n"));
620  err = -EEXIST;
621  goto out;
622  }
623 
624  ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
625 
626  if (ifa == NULL) {
627  ADBG(("ipv6_add_addr: malloc failed\n"));
628  err = -ENOBUFS;
629  goto out;
630  }
631 
632  rt = addrconf_dst_alloc(idev, addr, false);
633  if (IS_ERR(rt)) {
634  err = PTR_ERR(rt);
635  goto out;
636  }
637 
638  ifa->addr = *addr;
639 
640  spin_lock_init(&ifa->lock);
641  spin_lock_init(&ifa->state_lock);
642  init_timer(&ifa->timer);
643  INIT_HLIST_NODE(&ifa->addr_lst);
644  ifa->timer.data = (unsigned long) ifa;
645  ifa->scope = scope;
646  ifa->prefix_len = pfxlen;
647  ifa->flags = flags | IFA_F_TENTATIVE;
648  ifa->cstamp = ifa->tstamp = jiffies;
649 
650  ifa->rt = rt;
651 
652  ifa->idev = idev;
653  in6_dev_hold(idev);
654  /* For caller */
655  in6_ifa_hold(ifa);
656 
657  /* Add to big hash table */
658  hash = inet6_addr_hash(addr);
659 
660  hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
661  spin_unlock(&addrconf_hash_lock);
662 
663  write_lock(&idev->lock);
664  /* Add to inet6_dev unicast addr list. */
665  ipv6_link_dev_addr(idev, ifa);
666 
667 #ifdef CONFIG_IPV6_PRIVACY
668  if (ifa->flags&IFA_F_TEMPORARY) {
669  list_add(&ifa->tmp_list, &idev->tempaddr_list);
670  in6_ifa_hold(ifa);
671  }
672 #endif
673 
674  in6_ifa_hold(ifa);
675  write_unlock(&idev->lock);
676 out2:
677  rcu_read_unlock_bh();
678 
679  if (likely(err == 0))
680  atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
681  else {
682  kfree(ifa);
683  ifa = ERR_PTR(err);
684  }
685 
686  return ifa;
687 out:
688  spin_unlock(&addrconf_hash_lock);
689  goto out2;
690 }
691 
692 /* This function wants to get referenced ifp and releases it before return */
693 
694 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
695 {
696  struct inet6_ifaddr *ifa, *ifn;
697  struct inet6_dev *idev = ifp->idev;
698  int state;
699  int deleted = 0, onlink = 0;
700  unsigned long expires = jiffies;
701 
702  spin_lock_bh(&ifp->state_lock);
703  state = ifp->state;
704  ifp->state = INET6_IFADDR_STATE_DEAD;
705  spin_unlock_bh(&ifp->state_lock);
706 
707  if (state == INET6_IFADDR_STATE_DEAD)
708  goto out;
709 
710  spin_lock_bh(&addrconf_hash_lock);
711  hlist_del_init_rcu(&ifp->addr_lst);
712  spin_unlock_bh(&addrconf_hash_lock);
713 
714  write_lock_bh(&idev->lock);
715 #ifdef CONFIG_IPV6_PRIVACY
716  if (ifp->flags&IFA_F_TEMPORARY) {
717  list_del(&ifp->tmp_list);
718  if (ifp->ifpub) {
719  in6_ifa_put(ifp->ifpub);
720  ifp->ifpub = NULL;
721  }
722  __in6_ifa_put(ifp);
723  }
724 #endif
725 
726  list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
727  if (ifa == ifp) {
728  list_del_init(&ifp->if_list);
729  __in6_ifa_put(ifp);
730 
731  if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
732  break;
733  deleted = 1;
734  continue;
735  } else if (ifp->flags & IFA_F_PERMANENT) {
736  if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
737  ifp->prefix_len)) {
738  if (ifa->flags & IFA_F_PERMANENT) {
739  onlink = 1;
740  if (deleted)
741  break;
742  } else {
743  unsigned long lifetime;
744 
745  if (!onlink)
746  onlink = -1;
747 
748  spin_lock(&ifa->lock);
749 
750  lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
751  /*
752  * Note: Because this address is
753  * not permanent, lifetime <
754  * LONG_MAX / HZ here.
755  */
756  if (time_before(expires,
757  ifa->tstamp + lifetime * HZ))
758  expires = ifa->tstamp + lifetime * HZ;
759  spin_unlock(&ifa->lock);
760  }
761  }
762  }
763  }
764  write_unlock_bh(&idev->lock);
765 
766  addrconf_del_timer(ifp);
767 
768  ipv6_ifa_notify(RTM_DELADDR, ifp);
769 
770  atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
771 
772  /*
773  * Purge or update corresponding prefix
774  *
775  * 1) we don't purge prefix here if address was not permanent.
776  * prefix is managed by its own lifetime.
777  * 2) if there're no addresses, delete prefix.
778  * 3) if there're still other permanent address(es),
779  * corresponding prefix is still permanent.
780  * 4) otherwise, update prefix lifetime to the
781  * longest valid lifetime among the corresponding
782  * addresses on the device.
783  * Note: subsequent RA will update lifetime.
784  *
785  * --yoshfuji
786  */
787  if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
788  struct in6_addr prefix;
789  struct rt6_info *rt;
790  struct net *net = dev_net(ifp->idev->dev);
791  struct flowi6 fl6 = {};
792 
793  ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
794  fl6.flowi6_oif = ifp->idev->dev->ifindex;
795  fl6.daddr = prefix;
796  rt = (struct rt6_info *)ip6_route_lookup(net, &fl6,
797  RT6_LOOKUP_F_IFACE);
798 
799  if (rt != net->ipv6.ip6_null_entry &&
800  addrconf_is_prefix_route(rt)) {
801  if (onlink == 0) {
802  ip6_del_rt(rt);
803  rt = NULL;
804  } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
805  rt6_set_expires(rt, expires);
806  }
807  }
808  dst_release(&rt->dst);
809  }
810 
811  /* clean up prefsrc entries */
812  rt6_remove_prefsrc(ifp);
813 out:
814  in6_ifa_put(ifp);
815 }
816 
817 #ifdef CONFIG_IPV6_PRIVACY
818 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
819 {
820  struct inet6_dev *idev = ifp->idev;
821  struct in6_addr addr, *tmpaddr;
822  unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
823  unsigned long regen_advance;
824  int tmp_plen;
825  int ret = 0;
826  int max_addresses;
827  u32 addr_flags;
828  unsigned long now = jiffies;
829 
830  write_lock(&idev->lock);
831  if (ift) {
832  spin_lock_bh(&ift->lock);
833  memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
834  spin_unlock_bh(&ift->lock);
835  tmpaddr = &addr;
836  } else {
837  tmpaddr = NULL;
838  }
839 retry:
840  in6_dev_hold(idev);
841  if (idev->cnf.use_tempaddr <= 0) {
842  write_unlock(&idev->lock);
843  pr_info("%s: use_tempaddr is disabled\n", __func__);
844  in6_dev_put(idev);
845  ret = -1;
846  goto out;
847  }
848  spin_lock_bh(&ifp->lock);
849  if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
850  idev->cnf.use_tempaddr = -1; /*XXX*/
851  spin_unlock_bh(&ifp->lock);
852  write_unlock(&idev->lock);
853  pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
854  __func__);
855  in6_dev_put(idev);
856  ret = -1;
857  goto out;
858  }
859  in6_ifa_hold(ifp);
860  memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
861  __ipv6_try_regen_rndid(idev, tmpaddr);
862  memcpy(&addr.s6_addr[8], idev->rndid, 8);
863  age = (now - ifp->tstamp) / HZ;
864  tmp_valid_lft = min_t(__u32,
865  ifp->valid_lft,
866  idev->cnf.temp_valid_lft + age);
867  tmp_prefered_lft = min_t(__u32,
868  ifp->prefered_lft,
869  idev->cnf.temp_prefered_lft + age -
870  idev->cnf.max_desync_factor);
871  tmp_plen = ifp->prefix_len;
872  max_addresses = idev->cnf.max_addresses;
873  tmp_tstamp = ifp->tstamp;
874  spin_unlock_bh(&ifp->lock);
875 
876  regen_advance = idev->cnf.regen_max_retry *
877  idev->cnf.dad_transmits *
878  idev->nd_parms->retrans_time / HZ;
879  write_unlock(&idev->lock);
880 
881  /* A temporary address is created only if this calculated Preferred
882  * Lifetime is greater than REGEN_ADVANCE time units. In particular,
883  * an implementation must not create a temporary address with a zero
884  * Preferred Lifetime.
885  */
886  if (tmp_prefered_lft <= regen_advance) {
887  in6_ifa_put(ifp);
888  in6_dev_put(idev);
889  ret = -1;
890  goto out;
891  }
892 
893  addr_flags = IFA_F_TEMPORARY;
894  /* set in addrconf_prefix_rcv() */
895  if (ifp->flags & IFA_F_OPTIMISTIC)
896  addr_flags |= IFA_F_OPTIMISTIC;
897 
898  ift = !max_addresses ||
899  ipv6_count_addresses(idev) < max_addresses ?
900  ipv6_add_addr(idev, &addr, tmp_plen,
901  ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
902  addr_flags) : NULL;
903  if (!ift || IS_ERR(ift)) {
904  in6_ifa_put(ifp);
905  in6_dev_put(idev);
906  pr_info("%s: retry temporary address regeneration\n", __func__);
907  tmpaddr = &addr;
908  write_lock(&idev->lock);
909  goto retry;
910  }
911 
912  spin_lock_bh(&ift->lock);
913  ift->ifpub = ifp;
914  ift->valid_lft = tmp_valid_lft;
915  ift->prefered_lft = tmp_prefered_lft;
916  ift->cstamp = now;
917  ift->tstamp = tmp_tstamp;
918  spin_unlock_bh(&ift->lock);
919 
920  addrconf_dad_start(ift);
921  in6_ifa_put(ift);
922  in6_dev_put(idev);
923 out:
924  return ret;
925 }
926 #endif
927 
928 /*
929  * Choose an appropriate source address (RFC3484)
930  */
931 enum {
932  IPV6_SADDR_RULE_INIT = 0,
933  IPV6_SADDR_RULE_LOCAL,
934  IPV6_SADDR_RULE_SCOPE,
935  IPV6_SADDR_RULE_PREFERRED,
936 #ifdef CONFIG_IPV6_MIP6
937  IPV6_SADDR_RULE_HOA,
938 #endif
939  IPV6_SADDR_RULE_OIF,
940  IPV6_SADDR_RULE_LABEL,
941 #ifdef CONFIG_IPV6_PRIVACY
942  IPV6_SADDR_RULE_PRIVACY,
943 #endif
944  IPV6_SADDR_RULE_ORCHID,
945  IPV6_SADDR_RULE_PREFIX,
946  IPV6_SADDR_RULE_MAX
947 };
948 
949 struct ipv6_saddr_score {
950  int rule;
951  int addr_type;
952  struct inet6_ifaddr *ifa;
953  DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
954  int scopedist;
955  int matchlen;
956 };
957 
958 struct ipv6_saddr_dst {
959  const struct in6_addr *addr;
960  int ifindex;
961  int scope;
962  int label;
963  unsigned int prefs;
964 };
965 
966 static inline int ipv6_saddr_preferred(int type)
967 {
968  if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
969  return 1;
970  return 0;
971 }
972 
973 static int ipv6_get_saddr_eval(struct net *net,
974  struct ipv6_saddr_score *score,
975  struct ipv6_saddr_dst *dst,
976  int i)
977 {
978  int ret;
979 
980  if (i <= score->rule) {
981  switch (i) {
982  case IPV6_SADDR_RULE_SCOPE:
983  ret = score->scopedist;
984  break;
985  case IPV6_SADDR_RULE_PREFIX:
986  ret = score->matchlen;
987  break;
988  default:
989  ret = !!test_bit(i, score->scorebits);
990  }
991  goto out;
992  }
993 
994  switch (i) {
995  case IPV6_SADDR_RULE_INIT:
996  /* Rule 0: remember if hiscore is not ready yet */
997  ret = !!score->ifa;
998  break;
999  case IPV6_SADDR_RULE_LOCAL:
1000  /* Rule 1: Prefer same address */
1001  ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1002  break;
1003  case IPV6_SADDR_RULE_SCOPE:
1004  /* Rule 2: Prefer appropriate scope
1005  *
1006  * ret
1007  * ^
1008  * -1 | d 15
1009  * ---+--+-+---> scope
1010  * |
1011  * | d is scope of the destination.
1012  * B-d | \
1013  * | \ <- smaller scope is better if
1014  * B-15 | \ if scope is enough for destinaion.
1015  * | ret = B - scope (-1 <= scope >= d <= 15).
1016  * d-C-1 | /
1017  * |/ <- greater is better
1018  * -C / if scope is not enough for destination.
1019  * /| ret = scope - C (-1 <= d < scope <= 15).
1020  *
1021  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1022  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1023  * Assume B = 0 and we get C > 29.
1024  */
1025  ret = __ipv6_addr_src_scope(score->addr_type);
1026  if (ret >= dst->scope)
1027  ret = -ret;
1028  else
1029  ret -= 128; /* 30 is enough */
1030  score->scopedist = ret;
1031  break;
1032  case IPV6_SADDR_RULE_PREFERRED:
1033  /* Rule 3: Avoid deprecated and optimistic addresses */
1034  ret = ipv6_saddr_preferred(score->addr_type) ||
1035  !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1036  break;
1037 #ifdef CONFIG_IPV6_MIP6
1038  case IPV6_SADDR_RULE_HOA:
1039  {
1040  /* Rule 4: Prefer home address */
1041  int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1042  ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1043  break;
1044  }
1045 #endif
1046  case IPV6_SADDR_RULE_OIF:
1047  /* Rule 5: Prefer outgoing interface */
1048  ret = (!dst->ifindex ||
1049  dst->ifindex == score->ifa->idev->dev->ifindex);
1050  break;
1051  case IPV6_SADDR_RULE_LABEL:
1052  /* Rule 6: Prefer matching label */
1053  ret = ipv6_addr_label(net,
1054  &score->ifa->addr, score->addr_type,
1055  score->ifa->idev->dev->ifindex) == dst->label;
1056  break;
1057 #ifdef CONFIG_IPV6_PRIVACY
1058  case IPV6_SADDR_RULE_PRIVACY:
1059  {
1060  /* Rule 7: Prefer public address
1061  * Note: prefer temporary address if use_tempaddr >= 2
1062  */
1063  int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1064  !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1065  score->ifa->idev->cnf.use_tempaddr >= 2;
1066  ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1067  break;
1068  }
1069 #endif
1070  case IPV6_SADDR_RULE_ORCHID:
1071  /* Rule 8-: Prefer ORCHID vs ORCHID or
1072  * non-ORCHID vs non-ORCHID
1073  */
1074  ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1075  ipv6_addr_orchid(dst->addr));
1076  break;
1077  case IPV6_SADDR_RULE_PREFIX:
1078  /* Rule 8: Use longest matching prefix */
1079  ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1080  if (ret > score->ifa->prefix_len)
1081  ret = score->ifa->prefix_len;
1082  score->matchlen = ret;
1083  break;
1084  default:
1085  ret = 0;
1086  }
1087 
1088  if (ret)
1089  __set_bit(i, score->scorebits);
1090  score->rule = i;
1091 out:
1092  return ret;
1093 }
1094 
1095 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1096  const struct in6_addr *daddr, unsigned int prefs,
1097  struct in6_addr *saddr)
1098 {
1099  struct ipv6_saddr_score scores[2],
1100  *score = &scores[0], *hiscore = &scores[1];
1101  struct ipv6_saddr_dst dst;
1102  struct net_device *dev;
1103  int dst_type;
1104 
1105  dst_type = __ipv6_addr_type(daddr);
1106  dst.addr = daddr;
1107  dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1108  dst.scope = __ipv6_addr_src_scope(dst_type);
1109  dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1110  dst.prefs = prefs;
1111 
1112  hiscore->rule = -1;
1113  hiscore->ifa = NULL;
1114 
1115  rcu_read_lock();
1116 
1117  for_each_netdev_rcu(net, dev) {
1118  struct inet6_dev *idev;
1119 
1120  /* Candidate Source Address (section 4)
1121  * - multicast and link-local destination address,
1122  * the set of candidate source address MUST only
1123  * include addresses assigned to interfaces
1124  * belonging to the same link as the outgoing
1125  * interface.
1126  * (- For site-local destination addresses, the
1127  * set of candidate source addresses MUST only
1128  * include addresses assigned to interfaces
1129  * belonging to the same site as the outgoing
1130  * interface.)
1131  */
1132  if (((dst_type & IPV6_ADDR_MULTICAST) ||
1133  dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1134  dst.ifindex && dev->ifindex != dst.ifindex)
1135  continue;
1136 
1137  idev = __in6_dev_get(dev);
1138  if (!idev)
1139  continue;
1140 
1141  read_lock_bh(&idev->lock);
1142  list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1143  int i;
1144 
1145  /*
1146  * - Tentative Address (RFC2462 section 5.4)
1147  * - A tentative address is not considered
1148  * "assigned to an interface" in the traditional
1149  * sense, unless it is also flagged as optimistic.
1150  * - Candidate Source Address (section 4)
1151  * - In any case, anycast addresses, multicast
1152  * addresses, and the unspecified address MUST
1153  * NOT be included in a candidate set.
1154  */
1155  if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1156  (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1157  continue;
1158 
1159  score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1160 
1161  if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1162  score->addr_type & IPV6_ADDR_MULTICAST)) {
1163  LIMIT_NETDEBUG(KERN_DEBUG
1164  "ADDRCONF: unspecified / multicast address "
1165  "assigned as unicast address on %s",
1166  dev->name);
1167  continue;
1168  }
1169 
1170  score->rule = -1;
1171  bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1172 
1173  for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1174  int minihiscore, miniscore;
1175 
1176  minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1177  miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1178 
1179  if (minihiscore > miniscore) {
1180  if (i == IPV6_SADDR_RULE_SCOPE &&
1181  score->scopedist > 0) {
1182  /*
1183  * special case:
1184  * each remaining entry
1185  * has too small (not enough)
1186  * scope, because ifa entries
1187  * are sorted by their scope
1188  * values.
1189  */
1190  goto try_nextdev;
1191  }
1192  break;
1193  } else if (minihiscore < miniscore) {
1194  if (hiscore->ifa)
1195  in6_ifa_put(hiscore->ifa);
1196 
1197  in6_ifa_hold(score->ifa);
1198 
1199  swap(hiscore, score);
1200 
1201  /* restore our iterator */
1202  score->ifa = hiscore->ifa;
1203 
1204  break;
1205  }
1206  }
1207  }
1208 try_nextdev:
1209  read_unlock_bh(&idev->lock);
1210  }
1211  rcu_read_unlock();
1212 
1213  if (!hiscore->ifa)
1214  return -EADDRNOTAVAIL;
1215 
1216  *saddr = hiscore->ifa->addr;
1217  in6_ifa_put(hiscore->ifa);
1218  return 0;
1219 }
1220 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1221 
1222 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1223  unsigned char banned_flags)
1224 {
1225  struct inet6_dev *idev;
1226  int err = -EADDRNOTAVAIL;
1227 
1228  rcu_read_lock();
1229  idev = __in6_dev_get(dev);
1230  if (idev) {
1231  struct inet6_ifaddr *ifp;
1232 
1233  read_lock_bh(&idev->lock);
1234  list_for_each_entry(ifp, &idev->addr_list, if_list) {
1235  if (ifp->scope == IFA_LINK &&
1236  !(ifp->flags & banned_flags)) {
1237  *addr = ifp->addr;
1238  err = 0;
1239  break;
1240  }
1241  }
1242  read_unlock_bh(&idev->lock);
1243  }
1244  rcu_read_unlock();
1245  return err;
1246 }
1247 
1248 static int ipv6_count_addresses(struct inet6_dev *idev)
1249 {
1250  int cnt = 0;
1251  struct inet6_ifaddr *ifp;
1252 
1253  read_lock_bh(&idev->lock);
1254  list_for_each_entry(ifp, &idev->addr_list, if_list)
1255  cnt++;
1256  read_unlock_bh(&idev->lock);
1257  return cnt;
1258 }
1259 
1260 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1261  struct net_device *dev, int strict)
1262 {
1263  struct inet6_ifaddr *ifp;
1264  struct hlist_node *node;
1265  unsigned int hash = inet6_addr_hash(addr);
1266 
1267  rcu_read_lock_bh();
1268  hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1269  if (!net_eq(dev_net(ifp->idev->dev), net))
1270  continue;
1271  if (ipv6_addr_equal(&ifp->addr, addr) &&
1272  !(ifp->flags&IFA_F_TENTATIVE) &&
1273  (dev == NULL || ifp->idev->dev == dev ||
1274  !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1275  rcu_read_unlock_bh();
1276  return 1;
1277  }
1278  }
1279 
1280  rcu_read_unlock_bh();
1281  return 0;
1282 }
1283 EXPORT_SYMBOL(ipv6_chk_addr);
1284 
1285 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1286  struct net_device *dev)
1287 {
1288  unsigned int hash = inet6_addr_hash(addr);
1289  struct inet6_ifaddr *ifp;
1290  struct hlist_node *node;
1291 
1292  hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1293  if (!net_eq(dev_net(ifp->idev->dev), net))
1294  continue;
1295  if (ipv6_addr_equal(&ifp->addr, addr)) {
1296  if (dev == NULL || ifp->idev->dev == dev)
1297  return true;
1298  }
1299  }
1300  return false;
1301 }
1302 
1303 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1304 {
1305  struct inet6_dev *idev;
1306  struct inet6_ifaddr *ifa;
1307  int onlink;
1308 
1309  onlink = 0;
1310  rcu_read_lock();
1311  idev = __in6_dev_get(dev);
1312  if (idev) {
1313  read_lock_bh(&idev->lock);
1314  list_for_each_entry(ifa, &idev->addr_list, if_list) {
1315  onlink = ipv6_prefix_equal(addr, &ifa->addr,
1316  ifa->prefix_len);
1317  if (onlink)
1318  break;
1319  }
1320  read_unlock_bh(&idev->lock);
1321  }
1322  rcu_read_unlock();
1323  return onlink;
1324 }
1325 EXPORT_SYMBOL(ipv6_chk_prefix);
1326 
1327 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1328  struct net_device *dev, int strict)
1329 {
1330  struct inet6_ifaddr *ifp, *result = NULL;
1331  unsigned int hash = inet6_addr_hash(addr);
1332  struct hlist_node *node;
1333 
1334  rcu_read_lock_bh();
1335  hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1336  if (!net_eq(dev_net(ifp->idev->dev), net))
1337  continue;
1338  if (ipv6_addr_equal(&ifp->addr, addr)) {
1339  if (dev == NULL || ifp->idev->dev == dev ||
1340  !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1341  result = ifp;
1342  in6_ifa_hold(ifp);
1343  break;
1344  }
1345  }
1346  }
1347  rcu_read_unlock_bh();
1348 
1349  return result;
1350 }
1351 
1352 /* Gets referenced address, destroys ifaddr */
1353 
1354 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1355 {
1356  if (ifp->flags&IFA_F_PERMANENT) {
1357  spin_lock_bh(&ifp->lock);
1358  addrconf_del_timer(ifp);
1359  ifp->flags |= IFA_F_TENTATIVE;
1360  if (dad_failed)
1361  ifp->flags |= IFA_F_DADFAILED;
1362  spin_unlock_bh(&ifp->lock);
1363  if (dad_failed)
1364  ipv6_ifa_notify(0, ifp);
1365  in6_ifa_put(ifp);
1366 #ifdef CONFIG_IPV6_PRIVACY
1367  } else if (ifp->flags&IFA_F_TEMPORARY) {
1368  struct inet6_ifaddr *ifpub;
1369  spin_lock_bh(&ifp->lock);
1370  ifpub = ifp->ifpub;
1371  if (ifpub) {
1372  in6_ifa_hold(ifpub);
1373  spin_unlock_bh(&ifp->lock);
1374  ipv6_create_tempaddr(ifpub, ifp);
1375  in6_ifa_put(ifpub);
1376  } else {
1377  spin_unlock_bh(&ifp->lock);
1378  }
1379  ipv6_del_addr(ifp);
1380 #endif
1381  } else
1382  ipv6_del_addr(ifp);
1383 }
1384 
1385 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1386 {
1387  int err = -ENOENT;
1388 
1389  spin_lock(&ifp->state_lock);
1390  if (ifp->state == INET6_IFADDR_STATE_DAD) {
1391  ifp->state = INET6_IFADDR_STATE_POSTDAD;
1392  err = 0;
1393  }
1394  spin_unlock(&ifp->state_lock);
1395 
1396  return err;
1397 }
1398 
1399 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1400 {
1401  struct inet6_dev *idev = ifp->idev;
1402 
1403  if (addrconf_dad_end(ifp)) {
1404  in6_ifa_put(ifp);
1405  return;
1406  }
1407 
1408  net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1409  ifp->idev->dev->name, &ifp->addr);
1410 
1411  if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1412  struct in6_addr addr;
1413 
1414  addr.s6_addr32[0] = htonl(0xfe800000);
1415  addr.s6_addr32[1] = 0;
1416 
1417  if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1418  ipv6_addr_equal(&ifp->addr, &addr)) {
1419  /* DAD failed for link-local based on MAC address */
1420  idev->cnf.disable_ipv6 = 1;
1421 
1422  pr_info("%s: IPv6 being disabled!\n",
1423  ifp->idev->dev->name);
1424  }
1425  }
1426 
1427  addrconf_dad_stop(ifp, 1);
1428 }
1429 
1430 /* Join to solicited addr multicast group. */
1431 
1432 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1433 {
1434  struct in6_addr maddr;
1435 
1436  if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1437  return;
1438 
1439  addrconf_addr_solict_mult(addr, &maddr);
1440  ipv6_dev_mc_inc(dev, &maddr);
1441 }
1442 
1443 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1444 {
1445  struct in6_addr maddr;
1446 
1447  if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1448  return;
1449 
1450  addrconf_addr_solict_mult(addr, &maddr);
1451  __ipv6_dev_mc_dec(idev, &maddr);
1452 }
1453 
1454 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1455 {
1456  struct in6_addr addr;
1457  if (ifp->prefix_len == 127) /* RFC 6164 */
1458  return;
1459  ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1460  if (ipv6_addr_any(&addr))
1461  return;
1462  ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1463 }
1464 
1465 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1466 {
1467  struct in6_addr addr;
1468  if (ifp->prefix_len == 127) /* RFC 6164 */
1469  return;
1470  ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1471  if (ipv6_addr_any(&addr))
1472  return;
1473  __ipv6_dev_ac_dec(ifp->idev, &addr);
1474 }
1475 
1476 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1477 {
1478  if (dev->addr_len != ETH_ALEN)
1479  return -1;
1480  memcpy(eui, dev->dev_addr, 3);
1481  memcpy(eui + 5, dev->dev_addr + 3, 3);
1482 
1483  /*
1484  * The zSeries OSA network cards can be shared among various
1485  * OS instances, but the OSA cards have only one MAC address.
1486  * This leads to duplicate address conflicts in conjunction
1487  * with IPv6 if more than one instance uses the same card.
1488  *
1489  * The driver for these cards can deliver a unique 16-bit
1490  * identifier for each instance sharing the same card. It is
1491  * placed instead of 0xFFFE in the interface identifier. The
1492  * "u" bit of the interface identifier is not inverted in this
1493  * case. Hence the resulting interface identifier has local
1494  * scope according to RFC2373.
1495  */
1496  if (dev->dev_id) {
1497  eui[3] = (dev->dev_id >> 8) & 0xFF;
1498  eui[4] = dev->dev_id & 0xFF;
1499  } else {
1500  eui[3] = 0xFF;
1501  eui[4] = 0xFE;
1502  eui[0] ^= 2;
1503  }
1504  return 0;
1505 }
1506 
1507 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1508 {
1509  if (dev->addr_len != IEEE802154_ADDR_LEN)
1510  return -1;
1511  memcpy(eui, dev->dev_addr, 8);
1512  return 0;
1513 }
1514 
1515 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1516 {
1517  /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1518  if (dev->addr_len != ARCNET_ALEN)
1519  return -1;
1520  memset(eui, 0, 7);
1521  eui[7] = *(u8 *)dev->dev_addr;
1522  return 0;
1523 }
1524 
1525 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1526 {
1527  if (dev->addr_len != INFINIBAND_ALEN)
1528  return -1;
1529  memcpy(eui, dev->dev_addr + 12, 8);
1530  eui[0] |= 2;
1531  return 0;
1532 }
1533 
1534 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1535 {
1536  if (addr == 0)
1537  return -1;
1538  eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1539  ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1540  ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1541  ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1542  ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1543  ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1544  eui[1] = 0;
1545  eui[2] = 0x5E;
1546  eui[3] = 0xFE;
1547  memcpy(eui + 4, &addr, 4);
1548  return 0;
1549 }
1550 
1551 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1552 {
1553  if (dev->priv_flags & IFF_ISATAP)
1554  return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1555  return -1;
1556 }
1557 
1558 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1559 {
1560  return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1561 }
1562 
1563 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1564 {
1565  switch (dev->type) {
1566  case ARPHRD_ETHER:
1567  case ARPHRD_FDDI:
1568  return addrconf_ifid_eui48(eui, dev);
1569  case ARPHRD_ARCNET:
1570  return addrconf_ifid_arcnet(eui, dev);
1571  case ARPHRD_INFINIBAND:
1572  return addrconf_ifid_infiniband(eui, dev);
1573  case ARPHRD_SIT:
1574  return addrconf_ifid_sit(eui, dev);
1575  case ARPHRD_IPGRE:
1576  return addrconf_ifid_gre(eui, dev);
1577  case ARPHRD_IEEE802154:
1578  return addrconf_ifid_eui64(eui, dev);
1579  }
1580  return -1;
1581 }
1582 
1583 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1584 {
1585  int err = -1;
1586  struct inet6_ifaddr *ifp;
1587 
1588  read_lock_bh(&idev->lock);
1589  list_for_each_entry(ifp, &idev->addr_list, if_list) {
1590  if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1591  memcpy(eui, ifp->addr.s6_addr+8, 8);
1592  err = 0;
1593  break;
1594  }
1595  }
1596  read_unlock_bh(&idev->lock);
1597  return err;
1598 }
1599 
1600 #ifdef CONFIG_IPV6_PRIVACY
1601 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1602 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1603 {
1604 regen:
1605  get_random_bytes(idev->rndid, sizeof(idev->rndid));
1606  idev->rndid[0] &= ~0x02;
1607 
1608  /*
1609  * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1610  * check if generated address is not inappropriate
1611  *
1612  * - Reserved subnet anycast (RFC 2526)
1613  * 11111101 11....11 1xxxxxxx
1614  * - ISATAP (RFC4214) 6.1
1615  * 00-00-5E-FE-xx-xx-xx-xx
1616  * - value 0
1617  * - XXX: already assigned to an address on the device
1618  */
1619  if (idev->rndid[0] == 0xfd &&
1620  (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1621  (idev->rndid[7]&0x80))
1622  goto regen;
1623  if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1624  if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1625  goto regen;
1626  if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1627  goto regen;
1628  }
1629 }
1630 
1631 static void ipv6_regen_rndid(unsigned long data)
1632 {
1633  struct inet6_dev *idev = (struct inet6_dev *) data;
1634  unsigned long expires;
1635 
1636  rcu_read_lock_bh();
1637  write_lock_bh(&idev->lock);
1638 
1639  if (idev->dead)
1640  goto out;
1641 
1642  __ipv6_regen_rndid(idev);
1643 
1644  expires = jiffies +
1645  idev->cnf.temp_prefered_lft * HZ -
1646  idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1647  idev->cnf.max_desync_factor * HZ;
1648  if (time_before(expires, jiffies)) {
1649  pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1650  __func__, idev->dev->name);
1651  goto out;
1652  }
1653 
1654  if (!mod_timer(&idev->regen_timer, expires))
1655  in6_dev_hold(idev);
1656 
1657 out:
1658  write_unlock_bh(&idev->lock);
1659  rcu_read_unlock_bh();
1660  in6_dev_put(idev);
1661 }
1662 
1663 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1664 {
1665  if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1666  __ipv6_regen_rndid(idev);
1667 }
1668 #endif
1669 
1670 /*
1671  * Add prefix route.
1672  */
1673 
1674 static void
1675 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1676  unsigned long expires, u32 flags)
1677 {
1678  struct fib6_config cfg = {
1679  .fc_table = RT6_TABLE_PREFIX,
1680  .fc_metric = IP6_RT_PRIO_ADDRCONF,
1681  .fc_ifindex = dev->ifindex,
1682  .fc_expires = expires,
1683  .fc_dst_len = plen,
1684  .fc_flags = RTF_UP | flags,
1685  .fc_nlinfo.nl_net = dev_net(dev),
1686  .fc_protocol = RTPROT_KERNEL,
1687  };
1688 
1689  cfg.fc_dst = *pfx;
1690 
1691  /* Prevent useless cloning on PtP SIT.
1692  This thing is done here expecting that the whole
1693  class of non-broadcast devices need not cloning.
1694  */
1695 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1696  if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1697  cfg.fc_flags |= RTF_NONEXTHOP;
1698 #endif
1699 
1700  ip6_route_add(&cfg);
1701 }
1702 
1703 
1704 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1705  int plen,
1706  const struct net_device *dev,
1707  u32 flags, u32 noflags)
1708 {
1709  struct fib6_node *fn;
1710  struct rt6_info *rt = NULL;
1711  struct fib6_table *table;
1712 
1713  table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1714  if (table == NULL)
1715  return NULL;
1716 
1717  read_lock_bh(&table->tb6_lock);
1718  fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1719  if (!fn)
1720  goto out;
1721  for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1722  if (rt->dst.dev->ifindex != dev->ifindex)
1723  continue;
1724  if ((rt->rt6i_flags & flags) != flags)
1725  continue;
1726  if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1727  continue;
1728  dst_hold(&rt->dst);
1729  break;
1730  }
1731 out:
1732  read_unlock_bh(&table->tb6_lock);
1733  return rt;
1734 }
1735 
1736 
1737 /* Create "default" multicast route to the interface */
1738 
1739 static void addrconf_add_mroute(struct net_device *dev)
1740 {
1741  struct fib6_config cfg = {
1742  .fc_table = RT6_TABLE_LOCAL,
1743  .fc_metric = IP6_RT_PRIO_ADDRCONF,
1744  .fc_ifindex = dev->ifindex,
1745  .fc_dst_len = 8,
1746  .fc_flags = RTF_UP,
1747  .fc_nlinfo.nl_net = dev_net(dev),
1748  };
1749 
1750  ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1751 
1752  ip6_route_add(&cfg);
1753 }
1754 
1755 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1756 static void sit_route_add(struct net_device *dev)
1757 {
1758  struct fib6_config cfg = {
1759  .fc_table = RT6_TABLE_MAIN,
1760  .fc_metric = IP6_RT_PRIO_ADDRCONF,
1761  .fc_ifindex = dev->ifindex,
1762  .fc_dst_len = 96,
1763  .fc_flags = RTF_UP | RTF_NONEXTHOP,
1764  .fc_nlinfo.nl_net = dev_net(dev),
1765  };
1766 
1767  /* prefix length - 96 bits "::d.d.d.d" */
1768  ip6_route_add(&cfg);
1769 }
1770 #endif
1771 
1772 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1773 {
1774  struct inet6_dev *idev;
1775 
1776  ASSERT_RTNL();
1777 
1778  idev = ipv6_find_idev(dev);
1779  if (!idev)
1780  return ERR_PTR(-ENOBUFS);
1781 
1782  if (idev->cnf.disable_ipv6)
1783  return ERR_PTR(-EACCES);
1784 
1785  /* Add default multicast route */
1786  if (!(dev->flags & IFF_LOOPBACK))
1787  addrconf_add_mroute(dev);
1788 
1789  return idev;
1790 }
1791 
1792 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1793 {
1794  struct prefix_info *pinfo;
1795  __u32 valid_lft;
1796  __u32 prefered_lft;
1797  int addr_type;
1798  struct inet6_dev *in6_dev;
1799  struct net *net = dev_net(dev);
1800 
1801  pinfo = (struct prefix_info *) opt;
1802 
1803  if (len < sizeof(struct prefix_info)) {
1804  ADBG(("addrconf: prefix option too short\n"));
1805  return;
1806  }
1807 
1808  /*
1809  * Validation checks ([ADDRCONF], page 19)
1810  */
1811 
1812  addr_type = ipv6_addr_type(&pinfo->prefix);
1813 
1814  if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1815  return;
1816 
1817  valid_lft = ntohl(pinfo->valid);
1818  prefered_lft = ntohl(pinfo->prefered);
1819 
1820  if (prefered_lft > valid_lft) {
1821  net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1822  return;
1823  }
1824 
1825  in6_dev = in6_dev_get(dev);
1826 
1827  if (in6_dev == NULL) {
1828  net_dbg_ratelimited("addrconf: device %s not configured\n",
1829  dev->name);
1830  return;
1831  }
1832 
1833  /*
1834  * Two things going on here:
1835  * 1) Add routes for on-link prefixes
1836  * 2) Configure prefixes with the auto flag set
1837  */
1838 
1839  if (pinfo->onlink) {
1840  struct rt6_info *rt;
1841  unsigned long rt_expires;
1842 
1843  /* Avoid arithmetic overflow. Really, we could
1844  * save rt_expires in seconds, likely valid_lft,
1845  * but it would require division in fib gc, that it
1846  * not good.
1847  */
1848  if (HZ > USER_HZ)
1849  rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1850  else
1851  rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1852 
1853  if (addrconf_finite_timeout(rt_expires))
1854  rt_expires *= HZ;
1855 
1856  rt = addrconf_get_prefix_route(&pinfo->prefix,
1857  pinfo->prefix_len,
1858  dev,
1859  RTF_ADDRCONF | RTF_PREFIX_RT,
1860  RTF_GATEWAY | RTF_DEFAULT);
1861 
1862  if (rt) {
1863  /* Autoconf prefix route */
1864  if (valid_lft == 0) {
1865  ip6_del_rt(rt);
1866  rt = NULL;
1867  } else if (addrconf_finite_timeout(rt_expires)) {
1868  /* not infinity */
1869  rt6_set_expires(rt, jiffies + rt_expires);
1870  } else {
1871  rt6_clean_expires(rt);
1872  }
1873  } else if (valid_lft) {
1874  clock_t expires = 0;
1875  int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1876  if (addrconf_finite_timeout(rt_expires)) {
1877  /* not infinity */
1878  flags |= RTF_EXPIRES;
1879  expires = jiffies_to_clock_t(rt_expires);
1880  }
1881  addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1882  dev, expires, flags);
1883  }
1884  if (rt)
1885  dst_release(&rt->dst);
1886  }
1887 
1888  /* Try to figure out our local address for this prefix */
1889 
1890  if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1891  struct inet6_ifaddr *ifp;
1892  struct in6_addr addr;
1893  int create = 0, update_lft = 0;
1894 
1895  if (pinfo->prefix_len == 64) {
1896  memcpy(&addr, &pinfo->prefix, 8);
1897  if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1898  ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1899  in6_dev_put(in6_dev);
1900  return;
1901  }
1902  goto ok;
1903  }
1904  net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
1905  pinfo->prefix_len);
1906  in6_dev_put(in6_dev);
1907  return;
1908 
1909 ok:
1910 
1911  ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1912 
1913  if (ifp == NULL && valid_lft) {
1914  int max_addresses = in6_dev->cnf.max_addresses;
1915  u32 addr_flags = 0;
1916 
1917 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1918  if (in6_dev->cnf.optimistic_dad &&
1919  !net->ipv6.devconf_all->forwarding && sllao)
1920  addr_flags = IFA_F_OPTIMISTIC;
1921 #endif
1922 
1923  /* Do not allow to create too much of autoconfigured
1924  * addresses; this would be too easy way to crash kernel.
1925  */
1926  if (!max_addresses ||
1927  ipv6_count_addresses(in6_dev) < max_addresses)
1928  ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1929  addr_type&IPV6_ADDR_SCOPE_MASK,
1930  addr_flags);
1931 
1932  if (!ifp || IS_ERR(ifp)) {
1933  in6_dev_put(in6_dev);
1934  return;
1935  }
1936 
1937  update_lft = create = 1;
1938  ifp->cstamp = jiffies;
1939  addrconf_dad_start(ifp);
1940  }
1941 
1942  if (ifp) {
1943  int flags;
1944  unsigned long now;
1945 #ifdef CONFIG_IPV6_PRIVACY
1946  struct inet6_ifaddr *ift;
1947 #endif
1948  u32 stored_lft;
1949 
1950  /* update lifetime (RFC2462 5.5.3 e) */
1951  spin_lock(&ifp->lock);
1952  now = jiffies;
1953  if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1954  stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1955  else
1956  stored_lft = 0;
1957  if (!update_lft && stored_lft) {
1958  if (valid_lft > MIN_VALID_LIFETIME ||
1959  valid_lft > stored_lft)
1960  update_lft = 1;
1961  else if (stored_lft <= MIN_VALID_LIFETIME) {
1962  /* valid_lft <= stored_lft is always true */
1963  /*
1964  * RFC 4862 Section 5.5.3e:
1965  * "Note that the preferred lifetime of
1966  * the corresponding address is always
1967  * reset to the Preferred Lifetime in
1968  * the received Prefix Information
1969  * option, regardless of whether the
1970  * valid lifetime is also reset or
1971  * ignored."
1972  *
1973  * So if the preferred lifetime in
1974  * this advertisement is different
1975  * than what we have stored, but the
1976  * valid lifetime is invalid, just
1977  * reset prefered_lft.
1978  *
1979  * We must set the valid lifetime
1980  * to the stored lifetime since we'll
1981  * be updating the timestamp below,
1982  * else we'll set it back to the
1983  * minimum.
1984  */
1985  if (prefered_lft != ifp->prefered_lft) {
1986  valid_lft = stored_lft;
1987  update_lft = 1;
1988  }
1989  } else {
1990  valid_lft = MIN_VALID_LIFETIME;
1991  if (valid_lft < prefered_lft)
1992  prefered_lft = valid_lft;
1993  update_lft = 1;
1994  }
1995  }
1996 
1997  if (update_lft) {
1998  ifp->valid_lft = valid_lft;
1999  ifp->prefered_lft = prefered_lft;
2000  ifp->tstamp = now;
2001  flags = ifp->flags;
2002  ifp->flags &= ~IFA_F_DEPRECATED;
2003  spin_unlock(&ifp->lock);
2004 
2005  if (!(flags&IFA_F_TENTATIVE))
2006  ipv6_ifa_notify(0, ifp);
2007  } else
2008  spin_unlock(&ifp->lock);
2009 
2010 #ifdef CONFIG_IPV6_PRIVACY
2011  read_lock_bh(&in6_dev->lock);
2012  /* update all temporary addresses in the list */
2013  list_for_each_entry(ift, &in6_dev->tempaddr_list,
2014  tmp_list) {
2015  int age, max_valid, max_prefered;
2016 
2017  if (ifp != ift->ifpub)
2018  continue;
2019 
2020  /*
2021  * RFC 4941 section 3.3:
2022  * If a received option will extend the lifetime
2023  * of a public address, the lifetimes of
2024  * temporary addresses should be extended,
2025  * subject to the overall constraint that no
2026  * temporary addresses should ever remain
2027  * "valid" or "preferred" for a time longer than
2028  * (TEMP_VALID_LIFETIME) or
2029  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2030  * respectively.
2031  */
2032  age = (now - ift->cstamp) / HZ;
2033  max_valid = in6_dev->cnf.temp_valid_lft - age;
2034  if (max_valid < 0)
2035  max_valid = 0;
2036 
2037  max_prefered = in6_dev->cnf.temp_prefered_lft -
2038  in6_dev->cnf.max_desync_factor -
2039  age;
2040  if (max_prefered < 0)
2041  max_prefered = 0;
2042 
2043  if (valid_lft > max_valid)
2044  valid_lft = max_valid;
2045 
2046  if (prefered_lft > max_prefered)
2047  prefered_lft = max_prefered;
2048 
2049  spin_lock(&ift->lock);
2050  flags = ift->flags;
2051  ift->valid_lft = valid_lft;
2052  ift->prefered_lft = prefered_lft;
2053  ift->tstamp = now;
2054  if (prefered_lft > 0)
2055  ift->flags &= ~IFA_F_DEPRECATED;
2056 
2057  spin_unlock(&ift->lock);
2058  if (!(flags&IFA_F_TENTATIVE))
2059  ipv6_ifa_notify(0, ift);
2060  }
2061 
2062  if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2063  /*
2064  * When a new public address is created as
2065  * described in [ADDRCONF], also create a new
2066  * temporary address. Also create a temporary
2067  * address if it's enabled but no temporary
2068  * address currently exists.
2069  */
2070  read_unlock_bh(&in6_dev->lock);
2071  ipv6_create_tempaddr(ifp, NULL);
2072  } else {
2073  read_unlock_bh(&in6_dev->lock);
2074  }
2075 #endif
2076  in6_ifa_put(ifp);
2077  addrconf_verify(0);
2078  }
2079  }
2080  inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2081  in6_dev_put(in6_dev);
2082 }
2083 
2084 /*
2085  * Set destination address.
2086  * Special case for SIT interfaces where we create a new "virtual"
2087  * device.
2088  */
2089 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2090 {
2091  struct in6_ifreq ireq;
2092  struct net_device *dev;
2093  int err = -EINVAL;
2094 
2095  rtnl_lock();
2096 
2097  err = -EFAULT;
2098  if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2099  goto err_exit;
2100 
2101  dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2102 
2103  err = -ENODEV;
2104  if (dev == NULL)
2105  goto err_exit;
2106 
2107 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2108  if (dev->type == ARPHRD_SIT) {
2109  const struct net_device_ops *ops = dev->netdev_ops;
2110  struct ifreq ifr;
2111  struct ip_tunnel_parm p;
2112 
2113  err = -EADDRNOTAVAIL;
2114  if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2115  goto err_exit;
2116 
2117  memset(&p, 0, sizeof(p));
2118  p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2119  p.iph.saddr = 0;
2120  p.iph.version = 4;
2121  p.iph.ihl = 5;
2122  p.iph.protocol = IPPROTO_IPV6;
2123  p.iph.ttl = 64;
2124  ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2125 
2126  if (ops->ndo_do_ioctl) {
2127  mm_segment_t oldfs = get_fs();
2128 
2129  set_fs(KERNEL_DS);
2130  err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2131  set_fs(oldfs);
2132  } else
2133  err = -EOPNOTSUPP;
2134 
2135  if (err == 0) {
2136  err = -ENOBUFS;
2137  dev = __dev_get_by_name(net, p.name);
2138  if (!dev)
2139  goto err_exit;
2140  err = dev_open(dev);
2141  }
2142  }
2143 #endif
2144 
2145 err_exit:
2146  rtnl_unlock();
2147  return err;
2148 }
2149 
2150 /*
2151  * Manual configuration of address on an interface
2152  */
2153 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2154  unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2155  __u32 valid_lft)
2156 {
2157  struct inet6_ifaddr *ifp;
2158  struct inet6_dev *idev;
2159  struct net_device *dev;
2160  int scope;
2161  u32 flags;
2162  clock_t expires;
2163  unsigned long timeout;
2164 
2165  ASSERT_RTNL();
2166 
2167  if (plen > 128)
2168  return -EINVAL;
2169 
2170  /* check the lifetime */
2171  if (!valid_lft || prefered_lft > valid_lft)
2172  return -EINVAL;
2173 
2174  dev = __dev_get_by_index(net, ifindex);
2175  if (!dev)
2176  return -ENODEV;
2177 
2178  idev = addrconf_add_dev(dev);
2179  if (IS_ERR(idev))
2180  return PTR_ERR(idev);
2181 
2182  scope = ipv6_addr_scope(pfx);
2183 
2184  timeout = addrconf_timeout_fixup(valid_lft, HZ);
2185  if (addrconf_finite_timeout(timeout)) {
2186  expires = jiffies_to_clock_t(timeout * HZ);
2187  valid_lft = timeout;
2188  flags = RTF_EXPIRES;
2189  } else {
2190  expires = 0;
2191  flags = 0;
2192  ifa_flags |= IFA_F_PERMANENT;
2193  }
2194 
2195  timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2196  if (addrconf_finite_timeout(timeout)) {
2197  if (timeout == 0)
2198  ifa_flags |= IFA_F_DEPRECATED;
2199  prefered_lft = timeout;
2200  }
2201 
2202  ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2203 
2204  if (!IS_ERR(ifp)) {
2205  spin_lock_bh(&ifp->lock);
2206  ifp->valid_lft = valid_lft;
2207  ifp->prefered_lft = prefered_lft;
2208  ifp->tstamp = jiffies;
2209  spin_unlock_bh(&ifp->lock);
2210 
2211  addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2212  expires, flags);
2213  /*
2214  * Note that section 3.1 of RFC 4429 indicates
2215  * that the Optimistic flag should not be set for
2216  * manually configured addresses
2217  */
2218  addrconf_dad_start(ifp);
2219  in6_ifa_put(ifp);
2220  addrconf_verify(0);
2221  return 0;
2222  }
2223 
2224  return PTR_ERR(ifp);
2225 }
2226 
2227 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2228  unsigned int plen)
2229 {
2230  struct inet6_ifaddr *ifp;
2231  struct inet6_dev *idev;
2232  struct net_device *dev;
2233 
2234  if (plen > 128)
2235  return -EINVAL;
2236 
2237  dev = __dev_get_by_index(net, ifindex);
2238  if (!dev)
2239  return -ENODEV;
2240 
2241  if ((idev = __in6_dev_get(dev)) == NULL)
2242  return -ENXIO;
2243 
2244  read_lock_bh(&idev->lock);
2245  list_for_each_entry(ifp, &idev->addr_list, if_list) {
2246  if (ifp->prefix_len == plen &&
2247  ipv6_addr_equal(pfx, &ifp->addr)) {
2248  in6_ifa_hold(ifp);
2249  read_unlock_bh(&idev->lock);
2250 
2251  ipv6_del_addr(ifp);
2252 
2253  /* If the last address is deleted administratively,
2254  disable IPv6 on this interface.
2255  */
2256  if (list_empty(&idev->addr_list))
2257  addrconf_ifdown(idev->dev, 1);
2258  return 0;
2259  }
2260  }
2261  read_unlock_bh(&idev->lock);
2262  return -EADDRNOTAVAIL;
2263 }
2264 
2265 
2266 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2267 {
2268  struct in6_ifreq ireq;
2269  int err;
2270 
2271  if (!capable(CAP_NET_ADMIN))
2272  return -EPERM;
2273 
2274  if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2275  return -EFAULT;
2276 
2277  rtnl_lock();
2278  err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2279  ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2280  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2281  rtnl_unlock();
2282  return err;
2283 }
2284 
2285 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2286 {
2287  struct in6_ifreq ireq;
2288  int err;
2289 
2290  if (!capable(CAP_NET_ADMIN))
2291  return -EPERM;
2292 
2293  if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2294  return -EFAULT;
2295 
2296  rtnl_lock();
2297  err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2298  ireq.ifr6_prefixlen);
2299  rtnl_unlock();
2300  return err;
2301 }
2302 
2303 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2304  int plen, int scope)
2305 {
2306  struct inet6_ifaddr *ifp;
2307 
2308  ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2309  if (!IS_ERR(ifp)) {
2310  spin_lock_bh(&ifp->lock);
2311  ifp->flags &= ~IFA_F_TENTATIVE;
2312  spin_unlock_bh(&ifp->lock);
2313  ipv6_ifa_notify(RTM_NEWADDR, ifp);
2314  in6_ifa_put(ifp);
2315  }
2316 }
2317 
2318 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2319 static void sit_add_v4_addrs(struct inet6_dev *idev)
2320 {
2321  struct in6_addr addr;
2322  struct net_device *dev;
2323  struct net *net = dev_net(idev->dev);
2324  int scope;
2325 
2326  ASSERT_RTNL();
2327 
2328  memset(&addr, 0, sizeof(struct in6_addr));
2329  memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2330 
2331  if (idev->dev->flags&IFF_POINTOPOINT) {
2332  addr.s6_addr32[0] = htonl(0xfe800000);
2333  scope = IFA_LINK;
2334  } else {
2335  scope = IPV6_ADDR_COMPATv4;
2336  }
2337 
2338  if (addr.s6_addr32[3]) {
2339  add_addr(idev, &addr, 128, scope);
2340  return;
2341  }
2342 
2343  for_each_netdev(net, dev) {
2344  struct in_device *in_dev = __in_dev_get_rtnl(dev);
2345  if (in_dev && (dev->flags & IFF_UP)) {
2346  struct in_ifaddr *ifa;
2347 
2348  int flag = scope;
2349 
2350  for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2351  int plen;
2352 
2353  addr.s6_addr32[3] = ifa->ifa_local;
2354 
2355  if (ifa->ifa_scope == RT_SCOPE_LINK)
2356  continue;
2357  if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2358  if (idev->dev->flags&IFF_POINTOPOINT)
2359  continue;
2360  flag |= IFA_HOST;
2361  }
2362  if (idev->dev->flags&IFF_POINTOPOINT)
2363  plen = 64;
2364  else
2365  plen = 96;
2366 
2367  add_addr(idev, &addr, plen, flag);
2368  }
2369  }
2370  }
2371 }
2372 #endif
2373 
2374 static void init_loopback(struct net_device *dev)
2375 {
2376  struct inet6_dev *idev;
2377 
2378  /* ::1 */
2379 
2380  ASSERT_RTNL();
2381 
2382  if ((idev = ipv6_find_idev(dev)) == NULL) {
2383  pr_debug("%s: add_dev failed\n", __func__);
2384  return;
2385  }
2386 
2387  add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2388 }
2389 
2390 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2391 {
2392  struct inet6_ifaddr *ifp;
2393  u32 addr_flags = IFA_F_PERMANENT;
2394 
2395 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2396  if (idev->cnf.optimistic_dad &&
2397  !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2398  addr_flags |= IFA_F_OPTIMISTIC;
2399 #endif
2400 
2401 
2402  ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2403  if (!IS_ERR(ifp)) {
2404  addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2405  addrconf_dad_start(ifp);
2406  in6_ifa_put(ifp);
2407  }
2408 }
2409 
2410 static void addrconf_dev_config(struct net_device *dev)
2411 {
2412  struct in6_addr addr;
2413  struct inet6_dev *idev;
2414 
2415  ASSERT_RTNL();
2416 
2417  if ((dev->type != ARPHRD_ETHER) &&
2418  (dev->type != ARPHRD_FDDI) &&
2419  (dev->type != ARPHRD_ARCNET) &&
2420  (dev->type != ARPHRD_INFINIBAND) &&
2421  (dev->type != ARPHRD_IEEE802154)) {
2422  /* Alas, we support only Ethernet autoconfiguration. */
2423  return;
2424  }
2425 
2426  idev = addrconf_add_dev(dev);
2427  if (IS_ERR(idev))
2428  return;
2429 
2430  memset(&addr, 0, sizeof(struct in6_addr));
2431  addr.s6_addr32[0] = htonl(0xFE800000);
2432 
2433  if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2434  addrconf_add_linklocal(idev, &addr);
2435 }
2436 
2437 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2438 static void addrconf_sit_config(struct net_device *dev)
2439 {
2440  struct inet6_dev *idev;
2441 
2442  ASSERT_RTNL();
2443 
2444  /*
2445  * Configure the tunnel with one of our IPv4
2446  * addresses... we should configure all of
2447  * our v4 addrs in the tunnel
2448  */
2449 
2450  if ((idev = ipv6_find_idev(dev)) == NULL) {
2451  pr_debug("%s: add_dev failed\n", __func__);
2452  return;
2453  }
2454 
2455  if (dev->priv_flags & IFF_ISATAP) {
2456  struct in6_addr addr;
2457 
2458  ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2459  addrconf_prefix_route(&addr, 64, dev, 0, 0);
2460  if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2461  addrconf_add_linklocal(idev, &addr);
2462  return;
2463  }
2464 
2465  sit_add_v4_addrs(idev);
2466 
2467  if (dev->flags&IFF_POINTOPOINT)
2468  addrconf_add_mroute(dev);
2469  else
2470  sit_route_add(dev);
2471 }
2472 #endif
2473 
2474 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2475 static void addrconf_gre_config(struct net_device *dev)
2476 {
2477  struct inet6_dev *idev;
2478  struct in6_addr addr;
2479 
2480  pr_info("%s(%s)\n", __func__, dev->name);
2481 
2482  ASSERT_RTNL();
2483 
2484  if ((idev = ipv6_find_idev(dev)) == NULL) {
2485  pr_debug("%s: add_dev failed\n", __func__);
2486  return;
2487  }
2488 
2489  ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2490  addrconf_prefix_route(&addr, 64, dev, 0, 0);
2491 
2492  if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2493  addrconf_add_linklocal(idev, &addr);
2494 }
2495 #endif
2496 
2497 static inline int
2498 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2499 {
2500  struct in6_addr lladdr;
2501 
2502  if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2503  addrconf_add_linklocal(idev, &lladdr);
2504  return 0;
2505  }
2506  return -1;
2507 }
2508 
2509 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2510 {
2511  struct net_device *link_dev;
2512  struct net *net = dev_net(idev->dev);
2513 
2514  /* first try to inherit the link-local address from the link device */
2515  if (idev->dev->iflink &&
2516  (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2517  if (!ipv6_inherit_linklocal(idev, link_dev))
2518  return;
2519  }
2520  /* then try to inherit it from any device */
2521  for_each_netdev(net, link_dev) {
2522  if (!ipv6_inherit_linklocal(idev, link_dev))
2523  return;
2524  }
2525  pr_debug("init ip6-ip6: add_linklocal failed\n");
2526 }
2527 
2528 /*
2529  * Autoconfigure tunnel with a link-local address so routing protocols,
2530  * DHCPv6, MLD etc. can be run over the virtual link
2531  */
2532 
2533 static void addrconf_ip6_tnl_config(struct net_device *dev)
2534 {
2535  struct inet6_dev *idev;
2536 
2537  ASSERT_RTNL();
2538 
2539  idev = addrconf_add_dev(dev);
2540  if (IS_ERR(idev)) {
2541  pr_debug("init ip6-ip6: add_dev failed\n");
2542  return;
2543  }
2544  ip6_tnl_add_linklocal(idev);
2545 }
2546 
2547 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2548  void *data)
2549 {
2550  struct net_device *dev = (struct net_device *) data;
2551  struct inet6_dev *idev = __in6_dev_get(dev);
2552  int run_pending = 0;
2553  int err;
2554 
2555  switch (event) {
2556  case NETDEV_REGISTER:
2557  if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2558  idev = ipv6_add_dev(dev);
2559  if (!idev)
2560  return notifier_from_errno(-ENOMEM);
2561  }
2562  break;
2563 
2564  case NETDEV_UP:
2565  case NETDEV_CHANGE:
2566  if (dev->flags & IFF_SLAVE)
2567  break;
2568 
2569  if (event == NETDEV_UP) {
2570  if (!addrconf_qdisc_ok(dev)) {
2571  /* device is not ready yet. */
2572  pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2573  dev->name);
2574  break;
2575  }
2576 
2577  if (!idev && dev->mtu >= IPV6_MIN_MTU)
2578  idev = ipv6_add_dev(dev);
2579 
2580  if (idev) {
2581  idev->if_flags |= IF_READY;
2582  run_pending = 1;
2583  }
2584  } else {
2585  if (!addrconf_qdisc_ok(dev)) {
2586  /* device is still not ready. */
2587  break;
2588  }
2589 
2590  if (idev) {
2591  if (idev->if_flags & IF_READY)
2592  /* device is already configured. */
2593  break;
2594  idev->if_flags |= IF_READY;
2595  }
2596 
2597  pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2598  dev->name);
2599 
2600  run_pending = 1;
2601  }
2602 
2603  switch (dev->type) {
2604 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2605  case ARPHRD_SIT:
2606  addrconf_sit_config(dev);
2607  break;
2608 #endif
2609 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2610  case ARPHRD_IPGRE:
2611  addrconf_gre_config(dev);
2612  break;
2613 #endif
2614  case ARPHRD_TUNNEL6:
2615  addrconf_ip6_tnl_config(dev);
2616  break;
2617  case ARPHRD_LOOPBACK:
2618  init_loopback(dev);
2619  break;
2620 
2621  default:
2622  addrconf_dev_config(dev);
2623  break;
2624  }
2625 
2626  if (idev) {
2627  if (run_pending)
2628  addrconf_dad_run(idev);
2629 
2630  /*
2631  * If the MTU changed during the interface down,
2632  * when the interface up, the changed MTU must be
2633  * reflected in the idev as well as routers.
2634  */
2635  if (idev->cnf.mtu6 != dev->mtu &&
2636  dev->mtu >= IPV6_MIN_MTU) {
2637  rt6_mtu_change(dev, dev->mtu);
2638  idev->cnf.mtu6 = dev->mtu;
2639  }
2640  idev->tstamp = jiffies;
2641  inet6_ifinfo_notify(RTM_NEWLINK, idev);
2642 
2643  /*
2644  * If the changed mtu during down is lower than
2645  * IPV6_MIN_MTU stop IPv6 on this interface.
2646  */
2647  if (dev->mtu < IPV6_MIN_MTU)
2648  addrconf_ifdown(dev, 1);
2649  }
2650  break;
2651 
2652  case NETDEV_CHANGEMTU:
2653  if (idev && dev->mtu >= IPV6_MIN_MTU) {
2654  rt6_mtu_change(dev, dev->mtu);
2655  idev->cnf.mtu6 = dev->mtu;
2656  break;
2657  }
2658 
2659  if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2660  idev = ipv6_add_dev(dev);
2661  if (idev)
2662  break;
2663  }
2664 
2665  /*
2666  * MTU falled under IPV6_MIN_MTU.
2667  * Stop IPv6 on this interface.
2668  */
2669 
2670  case NETDEV_DOWN:
2671  case NETDEV_UNREGISTER:
2672  /*
2673  * Remove all addresses from this interface.
2674  */
2675  addrconf_ifdown(dev, event != NETDEV_DOWN);
2676  break;
2677 
2678  case NETDEV_CHANGENAME:
2679  if (idev) {
2680  snmp6_unregister_dev(idev);
2681  addrconf_sysctl_unregister(idev);
2682  addrconf_sysctl_register(idev);
2683  err = snmp6_register_dev(idev);
2684  if (err)
2685  return notifier_from_errno(err);
2686  }
2687  break;
2688 
2689  case NETDEV_PRE_TYPE_CHANGE:
2690  case NETDEV_POST_TYPE_CHANGE:
2691  addrconf_type_change(dev, event);
2692  break;
2693  }
2694 
2695  return NOTIFY_OK;
2696 }
2697 
2698 /*
2699  * addrconf module should be notified of a device going up
2700  */
2701 static struct notifier_block ipv6_dev_notf = {
2702  .notifier_call = addrconf_notify,
2703 };
2704 
2705 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2706 {
2707  struct inet6_dev *idev;
2708  ASSERT_RTNL();
2709 
2710  idev = __in6_dev_get(dev);
2711 
2712  if (event == NETDEV_POST_TYPE_CHANGE)
2713  ipv6_mc_remap(idev);
2714  else if (event == NETDEV_PRE_TYPE_CHANGE)
2715  ipv6_mc_unmap(idev);
2716 }
2717 
2718 static int addrconf_ifdown(struct net_device *dev, int how)
2719 {
2720  struct net *net = dev_net(dev);
2721  struct inet6_dev *idev;
2722  struct inet6_ifaddr *ifa;
2723  int state, i;
2724 
2725  ASSERT_RTNL();
2726 
2727  rt6_ifdown(net, dev);
2728  neigh_ifdown(&nd_tbl, dev);
2729 
2730  idev = __in6_dev_get(dev);
2731  if (idev == NULL)
2732  return -ENODEV;
2733 
2734  /*
2735  * Step 1: remove reference to ipv6 device from parent device.
2736  * Do not dev_put!
2737  */
2738  if (how) {
2739  idev->dead = 1;
2740 
2741  /* protected by rtnl_lock */
2742  RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2743 
2744  /* Step 1.5: remove snmp6 entry */
2745  snmp6_unregister_dev(idev);
2746 
2747  }
2748 
2749  /* Step 2: clear hash table */
2750  for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2751  struct hlist_head *h = &inet6_addr_lst[i];
2752  struct hlist_node *n;
2753 
2754  spin_lock_bh(&addrconf_hash_lock);
2755  restart:
2756  hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2757  if (ifa->idev == idev) {
2758  hlist_del_init_rcu(&ifa->addr_lst);
2759  addrconf_del_timer(ifa);
2760  goto restart;
2761  }
2762  }
2763  spin_unlock_bh(&addrconf_hash_lock);
2764  }
2765 
2766  write_lock_bh(&idev->lock);
2767 
2768  /* Step 2: clear flags for stateless addrconf */
2769  if (!how)
2770  idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2771 
2772 #ifdef CONFIG_IPV6_PRIVACY
2773  if (how && del_timer(&idev->regen_timer))
2774  in6_dev_put(idev);
2775 
2776  /* Step 3: clear tempaddr list */
2777  while (!list_empty(&idev->tempaddr_list)) {
2778  ifa = list_first_entry(&idev->tempaddr_list,
2779  struct inet6_ifaddr, tmp_list);
2780  list_del(&ifa->tmp_list);
2781  write_unlock_bh(&idev->lock);
2782  spin_lock_bh(&ifa->lock);
2783 
2784  if (ifa->ifpub) {
2785  in6_ifa_put(ifa->ifpub);
2786  ifa->ifpub = NULL;
2787  }
2788  spin_unlock_bh(&ifa->lock);
2789  in6_ifa_put(ifa);
2790  write_lock_bh(&idev->lock);
2791  }
2792 #endif
2793 
2794  while (!list_empty(&idev->addr_list)) {
2795  ifa = list_first_entry(&idev->addr_list,
2796  struct inet6_ifaddr, if_list);
2797  addrconf_del_timer(ifa);
2798 
2799  list_del(&ifa->if_list);
2800 
2801  write_unlock_bh(&idev->lock);
2802 
2803  spin_lock_bh(&ifa->state_lock);
2804  state = ifa->state;
2805  ifa->state = INET6_IFADDR_STATE_DEAD;
2806  spin_unlock_bh(&ifa->state_lock);
2807 
2808  if (state != INET6_IFADDR_STATE_DEAD) {
2809  __ipv6_ifa_notify(RTM_DELADDR, ifa);
2810  atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2811  }
2812  in6_ifa_put(ifa);
2813 
2814  write_lock_bh(&idev->lock);
2815  }
2816 
2817  write_unlock_bh(&idev->lock);
2818 
2819  /* Step 5: Discard multicast list */
2820  if (how)
2821  ipv6_mc_destroy_dev(idev);
2822  else
2823  ipv6_mc_down(idev);
2824 
2825  idev->tstamp = jiffies;
2826 
2827  /* Last: Shot the device (if unregistered) */
2828  if (how) {
2829  addrconf_sysctl_unregister(idev);
2830  neigh_parms_release(&nd_tbl, idev->nd_parms);
2831  neigh_ifdown(&nd_tbl, dev);
2832  in6_dev_put(idev);
2833  }
2834  return 0;
2835 }
2836 
2837 static void addrconf_rs_timer(unsigned long data)
2838 {
2839  struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2840  struct inet6_dev *idev = ifp->idev;
2841 
2842  read_lock(&idev->lock);
2843  if (idev->dead || !(idev->if_flags & IF_READY))
2844  goto out;
2845 
2846  if (idev->cnf.forwarding)
2847  goto out;
2848 
2849  /* Announcement received after solicitation was sent */
2850  if (idev->if_flags & IF_RA_RCVD)
2851  goto out;
2852 
2853  spin_lock(&ifp->lock);
2854  if (ifp->probes++ < idev->cnf.rtr_solicits) {
2855  /* The wait after the last probe can be shorter */
2856  addrconf_mod_timer(ifp, AC_RS,
2857  (ifp->probes == idev->cnf.rtr_solicits) ?
2858  idev->cnf.rtr_solicit_delay :
2859  idev->cnf.rtr_solicit_interval);
2860  spin_unlock(&ifp->lock);
2861 
2862  ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2863  } else {
2864  spin_unlock(&ifp->lock);
2865  /*
2866  * Note: we do not support deprecated "all on-link"
2867  * assumption any longer.
2868  */
2869  pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
2870  }
2871 
2872 out:
2873  read_unlock(&idev->lock);
2874  in6_ifa_put(ifp);
2875 }
2876 
2877 /*
2878  * Duplicate Address Detection
2879  */
2880 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2881 {
2882  unsigned long rand_num;
2883  struct inet6_dev *idev = ifp->idev;
2884 
2885  if (ifp->flags & IFA_F_OPTIMISTIC)
2886  rand_num = 0;
2887  else
2888  rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2889 
2890  ifp->probes = idev->cnf.dad_transmits;
2891  addrconf_mod_timer(ifp, AC_DAD, rand_num);
2892 }
2893 
2894 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
2895 {
2896  struct inet6_dev *idev = ifp->idev;
2897  struct net_device *dev = idev->dev;
2898 
2899  addrconf_join_solict(dev, &ifp->addr);
2900 
2901  net_srandom(ifp->addr.s6_addr32[3]);
2902 
2903  read_lock_bh(&idev->lock);
2904  spin_lock(&ifp->lock);
2905  if (ifp->state == INET6_IFADDR_STATE_DEAD)
2906  goto out;
2907 
2908  if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2909  idev->cnf.accept_dad < 1 ||
2910  !(ifp->flags&IFA_F_TENTATIVE) ||
2911  ifp->flags & IFA_F_NODAD) {
2912  ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2913  spin_unlock(&ifp->lock);
2914  read_unlock_bh(&idev->lock);
2915 
2916  addrconf_dad_completed(ifp);
2917  return;
2918  }
2919 
2920  if (!(idev->if_flags & IF_READY)) {
2921  spin_unlock(&ifp->lock);
2922  read_unlock_bh(&idev->lock);
2923  /*
2924  * If the device is not ready:
2925  * - keep it tentative if it is a permanent address.
2926  * - otherwise, kill it.
2927  */
2928  in6_ifa_hold(ifp);
2929  addrconf_dad_stop(ifp, 0);
2930  return;
2931  }
2932 
2933  /*
2934  * Optimistic nodes can start receiving
2935  * Frames right away
2936  */
2937  if (ifp->flags & IFA_F_OPTIMISTIC)
2938  ip6_ins_rt(ifp->rt);
2939 
2940  addrconf_dad_kick(ifp);
2941 out:
2942  spin_unlock(&ifp->lock);
2943  read_unlock_bh(&idev->lock);
2944 }
2945 
2946 static void addrconf_dad_timer(unsigned long data)
2947 {
2948  struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2949  struct inet6_dev *idev = ifp->idev;
2950  struct in6_addr mcaddr;
2951 
2952  if (!ifp->probes && addrconf_dad_end(ifp))
2953  goto out;
2954 
2955  read_lock(&idev->lock);
2956  if (idev->dead || !(idev->if_flags & IF_READY)) {
2957  read_unlock(&idev->lock);
2958  goto out;
2959  }
2960 
2961  spin_lock(&ifp->lock);
2962  if (ifp->state == INET6_IFADDR_STATE_DEAD) {
2963  spin_unlock(&ifp->lock);
2964  read_unlock(&idev->lock);
2965  goto out;
2966  }
2967 
2968  if (ifp->probes == 0) {
2969  /*
2970  * DAD was successful
2971  */
2972 
2973  ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2974  spin_unlock(&ifp->lock);
2975  read_unlock(&idev->lock);
2976 
2977  addrconf_dad_completed(ifp);
2978 
2979  goto out;
2980  }
2981 
2982  ifp->probes--;
2983  addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2984  spin_unlock(&ifp->lock);
2985  read_unlock(&idev->lock);
2986 
2987  /* send a neighbour solicitation for our addr */
2988  addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2989  ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2990 out:
2991  in6_ifa_put(ifp);
2992 }
2993 
2994 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2995 {
2996  struct net_device *dev = ifp->idev->dev;
2997 
2998  /*
2999  * Configure the address for reception. Now it is valid.
3000  */
3001 
3002  ipv6_ifa_notify(RTM_NEWADDR, ifp);
3003 
3004  /* If added prefix is link local and we are prepared to process
3005  router advertisements, start sending router solicitations.
3006  */
3007 
3008  if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3009  ifp->idev->cnf.accept_ra == 2) &&
3010  ifp->idev->cnf.rtr_solicits > 0 &&
3011  (dev->flags&IFF_LOOPBACK) == 0 &&
3012  (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3013  /*
3014  * If a host as already performed a random delay
3015  * [...] as part of DAD [...] there is no need
3016  * to delay again before sending the first RS
3017  */
3018  ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3019 
3020  spin_lock_bh(&ifp->lock);
3021  ifp->probes = 1;
3022  ifp->idev->if_flags |= IF_RS_SENT;
3023  addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3024  spin_unlock_bh(&ifp->lock);
3025  }
3026 }
3027 
3028 static void addrconf_dad_run(struct inet6_dev *idev)
3029 {
3030  struct inet6_ifaddr *ifp;
3031 
3032  read_lock_bh(&idev->lock);
3033  list_for_each_entry(ifp, &idev->addr_list, if_list) {
3034  spin_lock(&ifp->lock);
3035  if (ifp->flags & IFA_F_TENTATIVE &&
3036  ifp->state == INET6_IFADDR_STATE_DAD)
3037  addrconf_dad_kick(ifp);
3038  spin_unlock(&ifp->lock);
3039  }
3040  read_unlock_bh(&idev->lock);
3041 }
3042 
3043 #ifdef CONFIG_PROC_FS
3044 struct if6_iter_state {
3045  struct seq_net_private p;
3046  int bucket;
3047  int offset;
3048 };
3049 
3050 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3051 {
3052  struct inet6_ifaddr *ifa = NULL;
3053  struct if6_iter_state *state = seq->private;
3054  struct net *net = seq_file_net(seq);
3055  int p = 0;
3056 
3057  /* initial bucket if pos is 0 */
3058  if (pos == 0) {
3059  state->bucket = 0;
3060  state->offset = 0;
3061  }
3062 
3063  for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3064  struct hlist_node *n;
3065  hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3066  addr_lst) {
3067  if (!net_eq(dev_net(ifa->idev->dev), net))
3068  continue;
3069  /* sync with offset */
3070  if (p < state->offset) {
3071  p++;
3072  continue;
3073  }
3074  state->offset++;
3075  return ifa;
3076  }
3077 
3078  /* prepare for next bucket */
3079  state->offset = 0;
3080  p = 0;
3081  }
3082  return NULL;
3083 }
3084 
3085 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3086  struct inet6_ifaddr *ifa)
3087 {
3088  struct if6_iter_state *state = seq->private;
3089  struct net *net = seq_file_net(seq);
3090  struct hlist_node *n = &ifa->addr_lst;
3091 
3092  hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3093  if (!net_eq(dev_net(ifa->idev->dev), net))
3094  continue;
3095  state->offset++;
3096  return ifa;
3097  }
3098 
3099  while (++state->bucket < IN6_ADDR_HSIZE) {
3100  state->offset = 0;
3101  hlist_for_each_entry_rcu_bh(ifa, n,
3102  &inet6_addr_lst[state->bucket], addr_lst) {
3103  if (!net_eq(dev_net(ifa->idev->dev), net))
3104  continue;
3105  state->offset++;
3106  return ifa;
3107  }
3108  }
3109 
3110  return NULL;
3111 }
3112 
3113 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3114  __acquires(rcu_bh)
3115 {
3116  rcu_read_lock_bh();
3117  return if6_get_first(seq, *pos);
3118 }
3119 
3120 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3121 {
3122  struct inet6_ifaddr *ifa;
3123 
3124  ifa = if6_get_next(seq, v);
3125  ++*pos;
3126  return ifa;
3127 }
3128 
3129 static void if6_seq_stop(struct seq_file *seq, void *v)
3130  __releases(rcu_bh)
3131 {
3132  rcu_read_unlock_bh();
3133 }
3134 
3135 static int if6_seq_show(struct seq_file *seq, void *v)
3136 {
3137  struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3138  seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3139  &ifp->addr,
3140  ifp->idev->dev->ifindex,
3141  ifp->prefix_len,
3142  ifp->scope,
3143  ifp->flags,
3144  ifp->idev->dev->name);
3145  return 0;
3146 }
3147 
3148 static const struct seq_operations if6_seq_ops = {
3149  .start = if6_seq_start,
3150  .next = if6_seq_next,
3151  .show = if6_seq_show,
3152  .stop = if6_seq_stop,
3153 };
3154 
3155 static int if6_seq_open(struct inode *inode, struct file *file)
3156 {
3157  return seq_open_net(inode, file, &if6_seq_ops,
3158  sizeof(struct if6_iter_state));
3159 }
3160 
3161 static const struct file_operations if6_fops = {
3162  .owner = THIS_MODULE,
3163  .open = if6_seq_open,
3164  .read = seq_read,
3165  .llseek = seq_lseek,
3166  .release = seq_release_net,
3167 };
3168 
3169 static int __net_init if6_proc_net_init(struct net *net)
3170 {
3171  if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3172  return -ENOMEM;
3173  return 0;
3174 }
3175 
3176 static void __net_exit if6_proc_net_exit(struct net *net)
3177 {
3178  proc_net_remove(net, "if_inet6");
3179 }
3180 
3181 static struct pernet_operations if6_proc_net_ops = {
3182  .init = if6_proc_net_init,
3183  .exit = if6_proc_net_exit,
3184 };
3185 
3186 int __init if6_proc_init(void)
3187 {
3188  return register_pernet_subsys(&if6_proc_net_ops);
3189 }
3190 
3191 void if6_proc_exit(void)
3192 {
3193  unregister_pernet_subsys(&if6_proc_net_ops);
3194 }
3195 #endif /* CONFIG_PROC_FS */
3196 
3197 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3198 /* Check if address is a home address configured on any interface. */
3199 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3200 {
3201  int ret = 0;
3202  struct inet6_ifaddr *ifp = NULL;
3203  struct hlist_node *n;
3204  unsigned int hash = inet6_addr_hash(addr);
3205 
3206  rcu_read_lock_bh();
3207  hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3208  if (!net_eq(dev_net(ifp->idev->dev), net))
3209  continue;
3210  if (ipv6_addr_equal(&ifp->addr, addr) &&
3211  (ifp->flags & IFA_F_HOMEADDRESS)) {
3212  ret = 1;
3213  break;
3214  }
3215  }
3216  rcu_read_unlock_bh();
3217  return ret;
3218 }
3219 #endif
3220 
3221 /*
3222  * Periodic address status verification
3223  */
3224 
3225 static void addrconf_verify(unsigned long foo)
3226 {
3227  unsigned long now, next, next_sec, next_sched;
3228  struct inet6_ifaddr *ifp;
3229  struct hlist_node *node;
3230  int i;
3231 
3232  rcu_read_lock_bh();
3233  spin_lock(&addrconf_verify_lock);
3234  now = jiffies;
3235  next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3236 
3237  del_timer(&addr_chk_timer);
3238 
3239  for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3240 restart:
3241  hlist_for_each_entry_rcu_bh(ifp, node,
3242  &inet6_addr_lst[i], addr_lst) {
3243  unsigned long age;
3244 
3245  if (ifp->flags & IFA_F_PERMANENT)
3246  continue;
3247 
3248  spin_lock(&ifp->lock);
3249  /* We try to batch several events at once. */
3250  age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3251 
3252  if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3253  age >= ifp->valid_lft) {
3254  spin_unlock(&ifp->lock);
3255  in6_ifa_hold(ifp);
3256  ipv6_del_addr(ifp);
3257  goto restart;
3258  } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3259  spin_unlock(&ifp->lock);
3260  continue;
3261  } else if (age >= ifp->prefered_lft) {
3262  /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3263  int deprecate = 0;
3264 
3265  if (!(ifp->flags&IFA_F_DEPRECATED)) {
3266  deprecate = 1;
3267  ifp->flags |= IFA_F_DEPRECATED;
3268  }
3269 
3270  if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3271  next = ifp->tstamp + ifp->valid_lft * HZ;
3272 
3273  spin_unlock(&ifp->lock);
3274 
3275  if (deprecate) {
3276  in6_ifa_hold(ifp);
3277 
3278  ipv6_ifa_notify(0, ifp);
3279  in6_ifa_put(ifp);
3280  goto restart;
3281  }
3282 #ifdef CONFIG_IPV6_PRIVACY
3283  } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3284  !(ifp->flags&IFA_F_TENTATIVE)) {
3285  unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3286  ifp->idev->cnf.dad_transmits *
3287  ifp->idev->nd_parms->retrans_time / HZ;
3288 
3289  if (age >= ifp->prefered_lft - regen_advance) {
3290  struct inet6_ifaddr *ifpub = ifp->ifpub;
3291  if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3292  next = ifp->tstamp + ifp->prefered_lft * HZ;
3293  if (!ifp->regen_count && ifpub) {
3294  ifp->regen_count++;
3295  in6_ifa_hold(ifp);
3296  in6_ifa_hold(ifpub);
3297  spin_unlock(&ifp->lock);
3298 
3299  spin_lock(&ifpub->lock);
3300  ifpub->regen_count = 0;
3301  spin_unlock(&ifpub->lock);
3302  ipv6_create_tempaddr(ifpub, ifp);
3303  in6_ifa_put(ifpub);
3304  in6_ifa_put(ifp);
3305  goto restart;
3306  }
3307  } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3308  next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3309  spin_unlock(&ifp->lock);
3310 #endif
3311  } else {
3312  /* ifp->prefered_lft <= ifp->valid_lft */
3313  if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3314  next = ifp->tstamp + ifp->prefered_lft * HZ;
3315  spin_unlock(&ifp->lock);
3316  }
3317  }
3318  }
3319 
3320  next_sec = round_jiffies_up(next);
3321  next_sched = next;
3322 
3323  /* If rounded timeout is accurate enough, accept it. */
3324  if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3325  next_sched = next_sec;
3326 
3327  /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3328  if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3329  next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3330 
3331  ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3332  now, next, next_sec, next_sched));
3333 
3334  addr_chk_timer.expires = next_sched;
3335  add_timer(&addr_chk_timer);
3336  spin_unlock(&addrconf_verify_lock);
3337  rcu_read_unlock_bh();
3338 }
3339 
3340 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3341 {
3342  struct in6_addr *pfx = NULL;
3343 
3344  if (addr)
3345  pfx = nla_data(addr);
3346 
3347  if (local) {
3348  if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3349  pfx = NULL;
3350  else
3351  pfx = nla_data(local);
3352  }
3353 
3354  return pfx;
3355 }
3356 
3357 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3358  [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3359  [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3360  [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3361 };
3362 
3363 static int
3364 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3365 {
3366  struct net *net = sock_net(skb->sk);
3367  struct ifaddrmsg *ifm;
3368  struct nlattr *tb[IFA_MAX+1];
3369  struct in6_addr *pfx;
3370  int err;
3371 
3372  err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3373  if (err < 0)
3374  return err;
3375 
3376  ifm = nlmsg_data(nlh);
3377  pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3378  if (pfx == NULL)
3379  return -EINVAL;
3380 
3381  return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3382 }
3383 
3384 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3385  u32 prefered_lft, u32 valid_lft)
3386 {
3387  u32 flags;
3388  clock_t expires;
3389  unsigned long timeout;
3390 
3391  if (!valid_lft || (prefered_lft > valid_lft))
3392  return -EINVAL;
3393 
3394  timeout = addrconf_timeout_fixup(valid_lft, HZ);
3395  if (addrconf_finite_timeout(timeout)) {
3396  expires = jiffies_to_clock_t(timeout * HZ);
3397  valid_lft = timeout;
3398  flags = RTF_EXPIRES;
3399  } else {
3400  expires = 0;
3401  flags = 0;
3402  ifa_flags |= IFA_F_PERMANENT;
3403  }
3404 
3405  timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3406  if (addrconf_finite_timeout(timeout)) {
3407  if (timeout == 0)
3408  ifa_flags |= IFA_F_DEPRECATED;
3409  prefered_lft = timeout;
3410  }
3411 
3412  spin_lock_bh(&ifp->lock);
3413  ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3414  ifp->tstamp = jiffies;
3415  ifp->valid_lft = valid_lft;
3416  ifp->prefered_lft = prefered_lft;
3417 
3418  spin_unlock_bh(&ifp->lock);
3419  if (!(ifp->flags&IFA_F_TENTATIVE))
3420  ipv6_ifa_notify(0, ifp);
3421 
3422  addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3423  expires, flags);
3424  addrconf_verify(0);
3425 
3426  return 0;
3427 }
3428 
3429 static int
3430 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3431 {
3432  struct net *net = sock_net(skb->sk);
3433  struct ifaddrmsg *ifm;
3434  struct nlattr *tb[IFA_MAX+1];
3435  struct in6_addr *pfx;
3436  struct inet6_ifaddr *ifa;
3437  struct net_device *dev;
3438  u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3439  u8 ifa_flags;
3440  int err;
3441 
3442  err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3443  if (err < 0)
3444  return err;
3445 
3446  ifm = nlmsg_data(nlh);
3447  pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3448  if (pfx == NULL)
3449  return -EINVAL;
3450 
3451  if (tb[IFA_CACHEINFO]) {
3452  struct ifa_cacheinfo *ci;
3453 
3454  ci = nla_data(tb[IFA_CACHEINFO]);
3455  valid_lft = ci->ifa_valid;
3456  preferred_lft = ci->ifa_prefered;
3457  } else {
3458  preferred_lft = INFINITY_LIFE_TIME;
3459  valid_lft = INFINITY_LIFE_TIME;
3460  }
3461 
3462  dev = __dev_get_by_index(net, ifm->ifa_index);
3463  if (dev == NULL)
3464  return -ENODEV;
3465 
3466  /* We ignore other flags so far. */
3467  ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3468 
3469  ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3470  if (ifa == NULL) {
3471  /*
3472  * It would be best to check for !NLM_F_CREATE here but
3473  * userspace alreay relies on not having to provide this.
3474  */
3475  return inet6_addr_add(net, ifm->ifa_index, pfx,
3476  ifm->ifa_prefixlen, ifa_flags,
3477  preferred_lft, valid_lft);
3478  }
3479 
3480  if (nlh->nlmsg_flags & NLM_F_EXCL ||
3481  !(nlh->nlmsg_flags & NLM_F_REPLACE))
3482  err = -EEXIST;
3483  else
3484  err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3485 
3486  in6_ifa_put(ifa);
3487 
3488  return err;
3489 }
3490 
3491 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3492  u8 scope, int ifindex)
3493 {
3494  struct ifaddrmsg *ifm;
3495 
3496  ifm = nlmsg_data(nlh);
3497  ifm->ifa_family = AF_INET6;
3498  ifm->ifa_prefixlen = prefixlen;
3499  ifm->ifa_flags = flags;
3500  ifm->ifa_scope = scope;
3501  ifm->ifa_index = ifindex;
3502 }
3503 
3504 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3505  unsigned long tstamp, u32 preferred, u32 valid)
3506 {
3507  struct ifa_cacheinfo ci;
3508 
3509  ci.cstamp = cstamp_delta(cstamp);
3510  ci.tstamp = cstamp_delta(tstamp);
3511  ci.ifa_prefered = preferred;
3512  ci.ifa_valid = valid;
3513 
3514  return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3515 }
3516 
3517 static inline int rt_scope(int ifa_scope)
3518 {
3519  if (ifa_scope & IFA_HOST)
3520  return RT_SCOPE_HOST;
3521  else if (ifa_scope & IFA_LINK)
3522  return RT_SCOPE_LINK;
3523  else if (ifa_scope & IFA_SITE)
3524  return RT_SCOPE_SITE;
3525  else
3526  return RT_SCOPE_UNIVERSE;
3527 }
3528 
3529 static inline int inet6_ifaddr_msgsize(void)
3530 {
3531  return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3532  + nla_total_size(16) /* IFA_ADDRESS */
3533  + nla_total_size(sizeof(struct ifa_cacheinfo));
3534 }
3535 
3536 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3537  u32 portid, u32 seq, int event, unsigned int flags)
3538 {
3539  struct nlmsghdr *nlh;
3540  u32 preferred, valid;
3541 
3542  nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3543  if (nlh == NULL)
3544  return -EMSGSIZE;
3545 
3546  put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3547  ifa->idev->dev->ifindex);
3548 
3549  if (!(ifa->flags&IFA_F_PERMANENT)) {
3550  preferred = ifa->prefered_lft;
3551  valid = ifa->valid_lft;
3552  if (preferred != INFINITY_LIFE_TIME) {
3553  long tval = (jiffies - ifa->tstamp)/HZ;
3554  if (preferred > tval)
3555  preferred -= tval;
3556  else
3557  preferred = 0;
3558  if (valid != INFINITY_LIFE_TIME) {
3559  if (valid > tval)
3560  valid -= tval;
3561  else
3562  valid = 0;
3563  }
3564  }
3565  } else {
3566  preferred = INFINITY_LIFE_TIME;
3567  valid = INFINITY_LIFE_TIME;
3568  }
3569 
3570  if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3571  put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3572  nlmsg_cancel(skb, nlh);
3573  return -EMSGSIZE;
3574  }
3575 
3576  return nlmsg_end(skb, nlh);
3577 }
3578 
3579 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3580  u32 portid, u32 seq, int event, u16 flags)
3581 {
3582  struct nlmsghdr *nlh;
3583  u8 scope = RT_SCOPE_UNIVERSE;
3584  int ifindex = ifmca->idev->dev->ifindex;
3585 
3586  if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3587  scope = RT_SCOPE_SITE;
3588 
3589  nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3590  if (nlh == NULL)
3591  return -EMSGSIZE;
3592 
3593  put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3594  if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3595  put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3596  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3597  nlmsg_cancel(skb, nlh);
3598  return -EMSGSIZE;
3599  }
3600 
3601  return nlmsg_end(skb, nlh);
3602 }
3603 
3604 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3605  u32 portid, u32 seq, int event, unsigned int flags)
3606 {
3607  struct nlmsghdr *nlh;
3608  u8 scope = RT_SCOPE_UNIVERSE;
3609  int ifindex = ifaca->aca_idev->dev->ifindex;
3610 
3611  if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3612  scope = RT_SCOPE_SITE;
3613 
3614  nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3615  if (nlh == NULL)
3616  return -EMSGSIZE;
3617 
3618  put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3619  if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3620  put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3621  INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3622  nlmsg_cancel(skb, nlh);
3623  return -EMSGSIZE;
3624  }
3625 
3626  return nlmsg_end(skb, nlh);
3627 }
3628 
3629 enum addr_type_t {
3630  UNICAST_ADDR,
3631  MULTICAST_ADDR,
3632  ANYCAST_ADDR,
3633 };
3634 
3635 /* called with rcu_read_lock() */
3636 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3637  struct netlink_callback *cb, enum addr_type_t type,
3638  int s_ip_idx, int *p_ip_idx)
3639 {
3640  struct ifmcaddr6 *ifmca;
3641  struct ifacaddr6 *ifaca;
3642  int err = 1;
3643  int ip_idx = *p_ip_idx;
3644 
3645  read_lock_bh(&idev->lock);
3646  switch (type) {
3647  case UNICAST_ADDR: {
3648  struct inet6_ifaddr *ifa;
3649 
3650  /* unicast address incl. temp addr */
3651  list_for_each_entry(ifa, &idev->addr_list, if_list) {
3652  if (++ip_idx < s_ip_idx)
3653  continue;
3654  err = inet6_fill_ifaddr(skb, ifa,
3655  NETLINK_CB(cb->skb).portid,
3656  cb->nlh->nlmsg_seq,
3657  RTM_NEWADDR,
3658  NLM_F_MULTI);
3659  if (err <= 0)
3660  break;
3661  }
3662  break;
3663  }
3664  case MULTICAST_ADDR:
3665  /* multicast address */
3666  for (ifmca = idev->mc_list; ifmca;
3667  ifmca = ifmca->next, ip_idx++) {
3668  if (ip_idx < s_ip_idx)
3669  continue;
3670  err = inet6_fill_ifmcaddr(skb, ifmca,
3671  NETLINK_CB(cb->skb).portid,
3672  cb->nlh->nlmsg_seq,
3673  RTM_GETMULTICAST,
3674  NLM_F_MULTI);
3675  if (err <= 0)
3676  break;
3677  }
3678  break;
3679  case ANYCAST_ADDR:
3680  /* anycast address */
3681  for (ifaca = idev->ac_list; ifaca;
3682  ifaca = ifaca->aca_next, ip_idx++) {
3683  if (ip_idx < s_ip_idx)
3684  continue;
3685  err = inet6_fill_ifacaddr(skb, ifaca,
3686  NETLINK_CB(cb->skb).portid,
3687  cb->nlh->nlmsg_seq,
3688  RTM_GETANYCAST,
3689  NLM_F_MULTI);
3690  if (err <= 0)
3691  break;
3692  }
3693  break;
3694  default:
3695  break;
3696  }
3697  read_unlock_bh(&idev->lock);
3698  *p_ip_idx = ip_idx;
3699  return err;
3700 }
3701 
3702 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3703  enum addr_type_t type)
3704 {
3705  struct net *net = sock_net(skb->sk);
3706  int h, s_h;
3707  int idx, ip_idx;
3708  int s_idx, s_ip_idx;
3709  struct net_device *dev;
3710  struct inet6_dev *idev;
3711  struct hlist_head *head;
3712  struct hlist_node *node;
3713 
3714  s_h = cb->args[0];
3715  s_idx = idx = cb->args[1];
3716  s_ip_idx = ip_idx = cb->args[2];
3717 
3718  rcu_read_lock();
3719  for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3720  idx = 0;
3721  head = &net->dev_index_head[h];
3722  hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3723  if (idx < s_idx)
3724  goto cont;
3725  if (h > s_h || idx > s_idx)
3726  s_ip_idx = 0;
3727  ip_idx = 0;
3728  idev = __in6_dev_get(dev);
3729  if (!idev)
3730  goto cont;
3731 
3732  if (in6_dump_addrs(idev, skb, cb, type,
3733  s_ip_idx, &ip_idx) <= 0)
3734  goto done;
3735 cont:
3736  idx++;
3737  }
3738  }
3739 done:
3740  rcu_read_unlock();
3741  cb->args[0] = h;
3742  cb->args[1] = idx;
3743  cb->args[2] = ip_idx;
3744 
3745  return skb->len;
3746 }
3747 
3748 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3749 {
3750  enum addr_type_t type = UNICAST_ADDR;
3751 
3752  return inet6_dump_addr(skb, cb, type);
3753 }
3754 
3755 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3756 {
3757  enum addr_type_t type = MULTICAST_ADDR;
3758 
3759  return inet6_dump_addr(skb, cb, type);
3760 }
3761 
3762 
3763 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3764 {
3765  enum addr_type_t type = ANYCAST_ADDR;
3766 
3767  return inet6_dump_addr(skb, cb, type);
3768 }
3769 
3770 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3771  void *arg)
3772 {
3773  struct net *net = sock_net(in_skb->sk);
3774  struct ifaddrmsg *ifm;
3775  struct nlattr *tb[IFA_MAX+1];
3776  struct in6_addr *addr = NULL;
3777  struct net_device *dev = NULL;
3778  struct inet6_ifaddr *ifa;
3779  struct sk_buff *skb;
3780  int err;
3781 
3782  err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3783  if (err < 0)
3784  goto errout;
3785 
3786  addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3787  if (addr == NULL) {
3788  err = -EINVAL;
3789  goto errout;
3790  }
3791 
3792  ifm = nlmsg_data(nlh);
3793  if (ifm->ifa_index)
3794  dev = __dev_get_by_index(net, ifm->ifa_index);
3795 
3796  ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3797  if (!ifa) {
3798  err = -EADDRNOTAVAIL;
3799  goto errout;
3800  }
3801 
3802  skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3803  if (!skb) {
3804  err = -ENOBUFS;
3805  goto errout_ifa;
3806  }
3807 
3808  err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
3809  nlh->nlmsg_seq, RTM_NEWADDR, 0);
3810  if (err < 0) {
3811  /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3812  WARN_ON(err == -EMSGSIZE);
3813  kfree_skb(skb);
3814  goto errout_ifa;
3815  }
3816  err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3817 errout_ifa:
3818  in6_ifa_put(ifa);
3819 errout:
3820  return err;
3821 }
3822 
3823 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3824 {
3825  struct sk_buff *skb;
3826  struct net *net = dev_net(ifa->idev->dev);
3827  int err = -ENOBUFS;
3828 
3829  skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3830  if (skb == NULL)
3831  goto errout;
3832 
3833  err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3834  if (err < 0) {
3835  /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3836  WARN_ON(err == -EMSGSIZE);
3837  kfree_skb(skb);
3838  goto errout;
3839  }
3840  rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3841  return;
3842 errout:
3843  if (err < 0)
3844  rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3845 }
3846 
3847 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3848  __s32 *array, int bytes)
3849 {
3850  BUG_ON(bytes < (DEVCONF_MAX * 4));
3851 
3852  memset(array, 0, bytes);
3853  array[DEVCONF_FORWARDING] = cnf->forwarding;
3854  array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3855  array[DEVCONF_MTU6] = cnf->mtu6;
3856  array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3857  array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3858  array[DEVCONF_AUTOCONF] = cnf->autoconf;
3859  array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3860  array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3861  array[DEVCONF_RTR_SOLICIT_INTERVAL] =
3862  jiffies_to_msecs(cnf->rtr_solicit_interval);
3863  array[DEVCONF_RTR_SOLICIT_DELAY] =
3864  jiffies_to_msecs(cnf->rtr_solicit_delay);
3865  array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3866 #ifdef CONFIG_IPV6_PRIVACY
3867  array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3868  array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3869  array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3870  array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3871  array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3872 #endif
3873  array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3874  array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3875  array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3876 #ifdef CONFIG_IPV6_ROUTER_PREF
3877  array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3878  array[DEVCONF_RTR_PROBE_INTERVAL] =
3879  jiffies_to_msecs(cnf->rtr_probe_interval);
3880 #ifdef CONFIG_IPV6_ROUTE_INFO
3881  array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3882 #endif
3883 #endif
3884  array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3885  array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3886 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3887  array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3888 #endif
3889 #ifdef CONFIG_IPV6_MROUTE
3890  array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3891 #endif
3892  array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3893  array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3894  array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
3895 }
3896 
3897 static inline size_t inet6_ifla6_size(void)
3898 {
3899  return nla_total_size(4) /* IFLA_INET6_FLAGS */
3900  + nla_total_size(sizeof(struct ifla_cacheinfo))
3901  + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3902  + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3903  + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
3904 }
3905 
3906 static inline size_t inet6_if_nlmsg_size(void)
3907 {
3908  return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3909  + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3910  + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3911  + nla_total_size(4) /* IFLA_MTU */
3912  + nla_total_size(4) /* IFLA_LINK */
3913  + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
3914 }
3915 
3916 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
3917  int items, int bytes)
3918 {
3919  int i;
3920  int pad = bytes - sizeof(u64) * items;
3921  BUG_ON(pad < 0);
3922 
3923  /* Use put_unaligned() because stats may not be aligned for u64. */
3924  put_unaligned(items, &stats[0]);
3925  for (i = 1; i < items; i++)
3926  put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
3927 
3928  memset(&stats[items], 0, pad);
3929 }
3930 
3931 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
3932  int items, int bytes, size_t syncpoff)
3933 {
3934  int i;
3935  int pad = bytes - sizeof(u64) * items;
3936  BUG_ON(pad < 0);
3937 
3938  /* Use put_unaligned() because stats may not be aligned for u64. */
3939  put_unaligned(items, &stats[0]);
3940  for (i = 1; i < items; i++)
3941  put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
3942 
3943  memset(&stats[items], 0, pad);
3944 }
3945 
3946 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3947  int bytes)
3948 {
3949  switch (attrtype) {
3950  case IFLA_INET6_STATS:
3951  __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
3952  IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
3953  break;
3954  case IFLA_INET6_ICMP6STATS:
3955  __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
3956  break;
3957  }
3958 }
3959 
3960 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
3961 {
3962  struct nlattr *nla;
3963  struct ifla_cacheinfo ci;
3964 
3965  if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
3966  goto nla_put_failure;
3967  ci.max_reasm_len = IPV6_MAXPLEN;
3968  ci.tstamp = cstamp_delta(idev->tstamp);
3969  ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
3970  ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
3971  if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
3972  goto nla_put_failure;
3973  nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3974  if (nla == NULL)
3975  goto nla_put_failure;
3976  ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3977 
3978  /* XXX - MC not implemented */
3979 
3980  nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3981  if (nla == NULL)
3982  goto nla_put_failure;
3983  snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3984 
3985  nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3986  if (nla == NULL)
3987  goto nla_put_failure;
3988  snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3989 
3990  return 0;
3991 
3992 nla_put_failure:
3993  return -EMSGSIZE;
3994 }
3995 
3996 static size_t inet6_get_link_af_size(const struct net_device *dev)
3997 {
3998  if (!__in6_dev_get(dev))
3999  return 0;
4000 
4001  return inet6_ifla6_size();
4002 }
4003 
4004 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4005 {
4006  struct inet6_dev *idev = __in6_dev_get(dev);
4007 
4008  if (!idev)
4009  return -ENODATA;
4010 
4011  if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4012  return -EMSGSIZE;
4013 
4014  return 0;
4015 }
4016 
4017 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4018  u32 portid, u32 seq, int event, unsigned int flags)
4019 {
4020  struct net_device *dev = idev->dev;
4021  struct ifinfomsg *hdr;
4022  struct nlmsghdr *nlh;
4023  void *protoinfo;
4024 
4025  nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4026  if (nlh == NULL)
4027  return -EMSGSIZE;
4028 
4029  hdr = nlmsg_data(nlh);
4030  hdr->ifi_family = AF_INET6;
4031  hdr->__ifi_pad = 0;
4032  hdr->ifi_type = dev->type;
4033  hdr->ifi_index = dev->ifindex;
4034  hdr->ifi_flags = dev_get_flags(dev);
4035  hdr->ifi_change = 0;
4036 
4037  if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4038  (dev->addr_len &&
4039  nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4040  nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4041  (dev->ifindex != dev->iflink &&
4042  nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4043  goto nla_put_failure;
4044  protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4045  if (protoinfo == NULL)
4046  goto nla_put_failure;
4047 
4048  if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4049  goto nla_put_failure;
4050 
4051  nla_nest_end(skb, protoinfo);
4052  return nlmsg_end(skb, nlh);
4053 
4054 nla_put_failure:
4055  nlmsg_cancel(skb, nlh);
4056  return -EMSGSIZE;
4057 }
4058 
4059 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4060 {
4061  struct net *net = sock_net(skb->sk);
4062  int h, s_h;
4063  int idx = 0, s_idx;
4064  struct net_device *dev;
4065  struct inet6_dev *idev;
4066  struct hlist_head *head;
4067  struct hlist_node *node;
4068 
4069  s_h = cb->args[0];
4070  s_idx = cb->args[1];
4071 
4072  rcu_read_lock();
4073  for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4074  idx = 0;
4075  head = &net->dev_index_head[h];
4076  hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4077  if (idx < s_idx)
4078  goto cont;
4079  idev = __in6_dev_get(dev);
4080  if (!idev)
4081  goto cont;
4082  if (inet6_fill_ifinfo(skb, idev,
4083  NETLINK_CB(cb->skb).portid,
4084  cb->nlh->nlmsg_seq,
4085  RTM_NEWLINK, NLM_F_MULTI) <= 0)
4086  goto out;
4087 cont:
4088  idx++;
4089  }
4090  }
4091 out:
4092  rcu_read_unlock();
4093  cb->args[1] = idx;
4094  cb->args[0] = h;
4095 
4096  return skb->len;
4097 }
4098 
4099 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4100 {
4101  struct sk_buff *skb;
4102  struct net *net = dev_net(idev->dev);
4103  int err = -ENOBUFS;
4104 
4105  skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4106  if (skb == NULL)
4107  goto errout;
4108 
4109  err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4110  if (err < 0) {
4111  /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4112  WARN_ON(err == -EMSGSIZE);
4113  kfree_skb(skb);
4114  goto errout;
4115  }
4116  rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4117  return;
4118 errout:
4119  if (err < 0)
4120  rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4121 }
4122 
4123 static inline size_t inet6_prefix_nlmsg_size(void)
4124 {
4125  return NLMSG_ALIGN(sizeof(struct prefixmsg))
4126  + nla_total_size(sizeof(struct in6_addr))
4127  + nla_total_size(sizeof(struct prefix_cacheinfo));
4128 }
4129 
4130 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4131  struct prefix_info *pinfo, u32 portid, u32 seq,
4132  int event, unsigned int flags)
4133 {
4134  struct prefixmsg *pmsg;
4135  struct nlmsghdr *nlh;
4136  struct prefix_cacheinfo ci;
4137 
4138  nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4139  if (nlh == NULL)
4140  return -EMSGSIZE;
4141 
4142  pmsg = nlmsg_data(nlh);
4143  pmsg->prefix_family = AF_INET6;
4144  pmsg->prefix_pad1 = 0;
4145  pmsg->prefix_pad2 = 0;
4146  pmsg->prefix_ifindex = idev->dev->ifindex;
4147  pmsg->prefix_len = pinfo->prefix_len;
4148  pmsg->prefix_type = pinfo->type;
4149  pmsg->prefix_pad3 = 0;
4150  pmsg->prefix_flags = 0;
4151  if (pinfo->onlink)
4152  pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4153  if (pinfo->autoconf)
4154  pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4155 
4156  if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4157  goto nla_put_failure;
4158  ci.preferred_time = ntohl(pinfo->prefered);
4159  ci.valid_time = ntohl(pinfo->valid);
4160  if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4161  goto nla_put_failure;
4162  return nlmsg_end(skb, nlh);
4163 
4164 nla_put_failure:
4165  nlmsg_cancel(skb, nlh);
4166  return -EMSGSIZE;
4167 }
4168 
4169 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4170  struct prefix_info *pinfo)
4171 {
4172  struct sk_buff *skb;
4173  struct net *net = dev_net(idev->dev);
4174  int err = -ENOBUFS;
4175 
4176  skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4177  if (skb == NULL)
4178  goto errout;
4179 
4180  err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4181  if (err < 0) {
4182  /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4183  WARN_ON(err == -EMSGSIZE);
4184  kfree_skb(skb);
4185  goto errout;
4186  }
4187  rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4188  return;
4189 errout:
4190  if (err < 0)
4191  rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4192 }
4193 
4194 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4195 {
4196  inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4197 
4198  switch (event) {
4199  case RTM_NEWADDR:
4200  /*
4201  * If the address was optimistic
4202  * we inserted the route at the start of
4203  * our DAD process, so we don't need
4204  * to do it again
4205  */
4206  if (!(ifp->rt->rt6i_node))
4207  ip6_ins_rt(ifp->rt);
4208  if (ifp->idev->cnf.forwarding)
4209  addrconf_join_anycast(ifp);
4210  break;
4211  case RTM_DELADDR:
4212  if (ifp->idev->cnf.forwarding)
4213  addrconf_leave_anycast(ifp);
4214  addrconf_leave_solict(ifp->idev, &ifp->addr);
4215  dst_hold(&ifp->rt->dst);
4216 
4217  if (ip6_del_rt(ifp->rt))
4218  dst_free(&ifp->rt->dst);
4219  break;
4220  }
4221 }
4222 
4223 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4224 {
4225  rcu_read_lock_bh();
4226  if (likely(ifp->idev->dead == 0))
4227  __ipv6_ifa_notify(event, ifp);
4228  rcu_read_unlock_bh();
4229 }
4230 
4231 #ifdef CONFIG_SYSCTL
4232 
4233 static
4234 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4235  void __user *buffer, size_t *lenp, loff_t *ppos)
4236 {
4237  int *valp = ctl->data;
4238  int val = *valp;
4239  loff_t pos = *ppos;
4240  ctl_table lctl;
4241  int ret;
4242 
4243  /*
4244  * ctl->data points to idev->cnf.forwarding, we should
4245  * not modify it until we get the rtnl lock.
4246  */
4247  lctl = *ctl;
4248  lctl.data = &val;
4249 
4250  ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4251 
4252  if (write)
4253  ret = addrconf_fixup_forwarding(ctl, valp, val);
4254  if (ret)
4255  *ppos = pos;
4256  return ret;
4257 }
4258 
4259 static void dev_disable_change(struct inet6_dev *idev)
4260 {
4261  if (!idev || !idev->dev)
4262  return;
4263 
4264  if (idev->cnf.disable_ipv6)
4265  addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4266  else
4267  addrconf_notify(NULL, NETDEV_UP, idev->dev);
4268 }
4269 
4270 static void addrconf_disable_change(struct net *net, __s32 newf)
4271 {
4272  struct net_device *dev;
4273  struct inet6_dev *idev;
4274 
4275  rcu_read_lock();
4276  for_each_netdev_rcu(net, dev) {
4277  idev = __in6_dev_get(dev);
4278  if (idev) {
4279  int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4280  idev->cnf.disable_ipv6 = newf;
4281  if (changed)
4282  dev_disable_change(idev);
4283  }
4284  }
4285  rcu_read_unlock();
4286 }
4287 
4288 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4289 {
4290  struct net *net;
4291  int old;
4292 
4293  if (!rtnl_trylock())
4294  return restart_syscall();
4295 
4296  net = (struct net *)table->extra2;
4297  old = *p;
4298  *p = newf;
4299 
4300  if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4301  rtnl_unlock();
4302  return 0;
4303  }
4304 
4305  if (p == &net->ipv6.devconf_all->disable_ipv6) {
4306  net->ipv6.devconf_dflt->disable_ipv6 = newf;
4307  addrconf_disable_change(net, newf);
4308  } else if ((!newf) ^ (!old))
4309  dev_disable_change((struct inet6_dev *)table->extra1);
4310 
4311  rtnl_unlock();
4312  return 0;
4313 }
4314 
4315 static
4316 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4317  void __user *buffer, size_t *lenp, loff_t *ppos)
4318 {
4319  int *valp = ctl->data;
4320  int val = *valp;
4321  loff_t pos = *ppos;
4322  ctl_table lctl;
4323  int ret;
4324 
4325  /*
4326  * ctl->data points to idev->cnf.disable_ipv6, we should
4327  * not modify it until we get the rtnl lock.
4328  */
4329  lctl = *ctl;
4330  lctl.data = &val;
4331 
4332  ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4333 
4334  if (write)
4335  ret = addrconf_disable_ipv6(ctl, valp, val);
4336  if (ret)
4337  *ppos = pos;
4338  return ret;
4339 }
4340 
4341 static struct addrconf_sysctl_table
4342 {
4343  struct ctl_table_header *sysctl_header;
4344  ctl_table addrconf_vars[DEVCONF_MAX+1];
4345 } addrconf_sysctl __read_mostly = {
4346  .sysctl_header = NULL,
4347  .addrconf_vars = {
4348  {
4349  .procname = "forwarding",
4350  .data = &ipv6_devconf.forwarding,
4351  .maxlen = sizeof(int),
4352  .mode = 0644,
4353  .proc_handler = addrconf_sysctl_forward,
4354  },
4355  {
4356  .procname = "hop_limit",
4357  .data = &ipv6_devconf.hop_limit,
4358  .maxlen = sizeof(int),
4359  .mode = 0644,
4360  .proc_handler = proc_dointvec,
4361  },
4362  {
4363  .procname = "mtu",
4364  .data = &ipv6_devconf.mtu6,
4365  .maxlen = sizeof(int),
4366  .mode = 0644,
4367  .proc_handler = proc_dointvec,
4368  },
4369  {
4370  .procname = "accept_ra",
4371  .data = &ipv6_devconf.accept_ra,
4372  .maxlen = sizeof(int),
4373  .mode = 0644,
4374  .proc_handler = proc_dointvec,
4375  },
4376  {
4377  .procname = "accept_redirects",
4378  .data = &ipv6_devconf.accept_redirects,
4379  .maxlen = sizeof(int),
4380  .mode = 0644,
4381  .proc_handler = proc_dointvec,
4382  },
4383  {
4384  .procname = "autoconf",
4385  .data = &ipv6_devconf.autoconf,
4386  .maxlen = sizeof(int),
4387  .mode = 0644,
4388  .proc_handler = proc_dointvec,
4389  },
4390  {
4391  .procname = "dad_transmits",
4392  .data = &ipv6_devconf.dad_transmits,
4393  .maxlen = sizeof(int),
4394  .mode = 0644,
4395  .proc_handler = proc_dointvec,
4396  },
4397  {
4398  .procname = "router_solicitations",
4399  .data = &ipv6_devconf.rtr_solicits,
4400  .maxlen = sizeof(int),
4401  .mode = 0644,
4402  .proc_handler = proc_dointvec,
4403  },
4404  {
4405  .procname = "router_solicitation_interval",
4406  .data = &ipv6_devconf.rtr_solicit_interval,
4407  .maxlen = sizeof(int),
4408  .mode = 0644,
4409  .proc_handler = proc_dointvec_jiffies,
4410  },
4411  {
4412  .procname = "router_solicitation_delay",
4413  .data = &ipv6_devconf.rtr_solicit_delay,
4414  .maxlen = sizeof(int),
4415  .mode = 0644,
4416  .proc_handler = proc_dointvec_jiffies,
4417  },
4418  {
4419  .procname = "force_mld_version",
4420  .data = &ipv6_devconf.force_mld_version,
4421  .maxlen = sizeof(int),
4422  .mode = 0644,
4423  .proc_handler = proc_dointvec,
4424  },
4425 #ifdef CONFIG_IPV6_PRIVACY
4426  {
4427  .procname = "use_tempaddr",
4428  .data = &ipv6_devconf.use_tempaddr,
4429  .maxlen = sizeof(int),
4430  .mode = 0644,
4431  .proc_handler = proc_dointvec,
4432  },
4433  {
4434  .procname = "temp_valid_lft",
4435  .data = &ipv6_devconf.temp_valid_lft,
4436  .maxlen = sizeof(int),
4437  .mode = 0644,
4438  .proc_handler = proc_dointvec,
4439  },
4440  {
4441  .procname = "temp_prefered_lft",
4442  .data = &ipv6_devconf.temp_prefered_lft,
4443  .maxlen = sizeof(int),
4444  .mode = 0644,
4445  .proc_handler = proc_dointvec,
4446  },
4447  {
4448  .procname = "regen_max_retry",
4449  .data = &ipv6_devconf.regen_max_retry,
4450  .maxlen = sizeof(int),
4451  .mode = 0644,
4452  .proc_handler = proc_dointvec,
4453  },
4454  {
4455  .procname = "max_desync_factor",
4456  .data = &ipv6_devconf.max_desync_factor,
4457  .maxlen = sizeof(int),
4458  .mode = 0644,
4459  .proc_handler = proc_dointvec,
4460  },
4461 #endif
4462  {
4463  .procname = "max_addresses",
4464  .data = &ipv6_devconf.max_addresses,
4465  .maxlen = sizeof(int),
4466  .mode = 0644,
4467  .proc_handler = proc_dointvec,
4468  },
4469  {
4470  .procname = "accept_ra_defrtr",
4471  .data = &ipv6_devconf.accept_ra_defrtr,
4472  .maxlen = sizeof(int),
4473  .mode = 0644,
4474  .proc_handler = proc_dointvec,
4475  },
4476  {
4477  .procname = "accept_ra_pinfo",
4478  .data = &ipv6_devconf.accept_ra_pinfo,
4479  .maxlen = sizeof(int),
4480  .mode = 0644,
4481  .proc_handler = proc_dointvec,
4482  },
4483 #ifdef CONFIG_IPV6_ROUTER_PREF
4484  {
4485  .procname = "accept_ra_rtr_pref",
4486  .data = &ipv6_devconf.accept_ra_rtr_pref,
4487  .maxlen = sizeof(int),
4488  .mode = 0644,
4489  .proc_handler = proc_dointvec,
4490  },
4491  {
4492  .procname = "router_probe_interval",
4493  .data = &ipv6_devconf.rtr_probe_interval,
4494  .maxlen = sizeof(int),
4495  .mode = 0644,
4496  .proc_handler = proc_dointvec_jiffies,
4497  },
4498 #ifdef CONFIG_IPV6_ROUTE_INFO
4499  {
4500  .procname = "accept_ra_rt_info_max_plen",
4501  .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4502  .maxlen = sizeof(int),
4503  .mode = 0644,
4504  .proc_handler = proc_dointvec,
4505  },
4506 #endif
4507 #endif
4508  {
4509  .procname = "proxy_ndp",
4510  .data = &ipv6_devconf.proxy_ndp,
4511  .maxlen = sizeof(int),
4512  .mode = 0644,
4513  .proc_handler = proc_dointvec,
4514  },
4515  {
4516  .procname = "accept_source_route",
4517  .data = &ipv6_devconf.accept_source_route,
4518  .maxlen = sizeof(int),
4519  .mode = 0644,
4520  .proc_handler = proc_dointvec,
4521  },
4522 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4523  {
4524  .procname = "optimistic_dad",
4525  .data = &ipv6_devconf.optimistic_dad,
4526  .maxlen = sizeof(int),
4527  .mode = 0644,
4528  .proc_handler = proc_dointvec,
4529 
4530  },
4531 #endif
4532 #ifdef CONFIG_IPV6_MROUTE
4533  {
4534  .procname = "mc_forwarding",
4535  .data = &ipv6_devconf.mc_forwarding,
4536  .maxlen = sizeof(int),
4537  .mode = 0444,
4538  .proc_handler = proc_dointvec,
4539  },
4540 #endif
4541  {
4542  .procname = "disable_ipv6",
4543  .data = &ipv6_devconf.disable_ipv6,
4544  .maxlen = sizeof(int),
4545  .mode = 0644,
4546  .proc_handler = addrconf_sysctl_disable,
4547  },
4548  {
4549  .procname = "accept_dad",
4550  .data = &ipv6_devconf.accept_dad,
4551  .maxlen = sizeof(int),
4552  .mode = 0644,
4553  .proc_handler = proc_dointvec,
4554  },
4555  {
4556  .procname = "force_tllao",
4557  .data = &ipv6_devconf.force_tllao,
4558  .maxlen = sizeof(int),
4559  .mode = 0644,
4560  .proc_handler = proc_dointvec
4561  },
4562  {
4563  /* sentinel */
4564  }
4565  },
4566 };
4567 
4568 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4569  struct inet6_dev *idev, struct ipv6_devconf *p)
4570 {
4571  int i;
4572  struct addrconf_sysctl_table *t;
4573  char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4574 
4575  t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4576  if (t == NULL)
4577  goto out;
4578 
4579  for (i = 0; t->addrconf_vars[i].data; i++) {
4580  t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4581  t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4582  t->addrconf_vars[i].extra2 = net;
4583  }
4584 
4585  snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4586 
4587  t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4588  if (t->sysctl_header == NULL)
4589  goto free;
4590 
4591  p->sysctl = t;
4592  return 0;
4593 
4594 free:
4595  kfree(t);
4596 out:
4597  return -ENOBUFS;
4598 }
4599 
4600 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4601 {
4602  struct addrconf_sysctl_table *t;
4603 
4604  if (p->sysctl == NULL)
4605  return;
4606 
4607  t = p->sysctl;
4608  p->sysctl = NULL;
4609  unregister_net_sysctl_table(t->sysctl_header);
4610  kfree(t);
4611 }
4612 
4613 static void addrconf_sysctl_register(struct inet6_dev *idev)
4614 {
4615  neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4616  &ndisc_ifinfo_sysctl_change);
4617  __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4618  idev, &idev->cnf);
4619 }
4620 
4621 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4622 {
4623  __addrconf_sysctl_unregister(&idev->cnf);
4624  neigh_sysctl_unregister(idev->nd_parms);
4625 }
4626 
4627 
4628 #endif
4629 
4630 static int __net_init addrconf_init_net(struct net *net)
4631 {
4632  int err;
4633  struct ipv6_devconf *all, *dflt;
4634 
4635  err = -ENOMEM;
4636  all = &ipv6_devconf;
4637  dflt = &ipv6_devconf_dflt;
4638 
4639  if (!net_eq(net, &init_net)) {
4640  all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4641  if (all == NULL)
4642  goto err_alloc_all;
4643 
4644  dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4645  if (dflt == NULL)
4646  goto err_alloc_dflt;
4647  } else {
4648  /* these will be inherited by all namespaces */
4649  dflt->autoconf = ipv6_defaults.autoconf;
4650  dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4651  }
4652 
4653  net->ipv6.devconf_all = all;
4654  net->ipv6.devconf_dflt = dflt;
4655 
4656 #ifdef CONFIG_SYSCTL
4657  err = __addrconf_sysctl_register(net, "all", NULL, all);
4658  if (err < 0)
4659  goto err_reg_all;
4660 
4661  err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4662  if (err < 0)
4663  goto err_reg_dflt;
4664 #endif
4665  return 0;
4666 
4667 #ifdef CONFIG_SYSCTL
4668 err_reg_dflt:
4669  __addrconf_sysctl_unregister(all);
4670 err_reg_all:
4671  kfree(dflt);
4672 #endif
4673 err_alloc_dflt:
4674  kfree(all);
4675 err_alloc_all:
4676  return err;
4677 }
4678 
4679 static void __net_exit addrconf_exit_net(struct net *net)
4680 {
4681 #ifdef CONFIG_SYSCTL
4682  __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4683  __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4684 #endif
4685  if (!net_eq(net, &init_net)) {
4686  kfree(net->ipv6.devconf_dflt);
4687  kfree(net->ipv6.devconf_all);
4688  }
4689 }
4690 
4691 static struct pernet_operations addrconf_ops = {
4692  .init = addrconf_init_net,
4693  .exit = addrconf_exit_net,
4694 };
4695 
4696 /*
4697  * Device notifier
4698  */
4699 
4700 int register_inet6addr_notifier(struct notifier_block *nb)
4701 {
4702  return atomic_notifier_chain_register(&inet6addr_chain, nb);
4703 }
4704 EXPORT_SYMBOL(register_inet6addr_notifier);
4705 
4706 int unregister_inet6addr_notifier(struct notifier_block *nb)
4707 {
4708  return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4709 }
4710 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4711 
4712 static struct rtnl_af_ops inet6_ops = {
4713  .family = AF_INET6,
4714  .fill_link_af = inet6_fill_link_af,
4715  .get_link_af_size = inet6_get_link_af_size,
4716 };
4717 
4718 /*
4719  * Init / cleanup code
4720  */
4721 
4722 int __init addrconf_init(void)
4723 {
4724  int i, err;
4725 
4726  err = ipv6_addr_label_init();
4727  if (err < 0) {
4728  pr_crit("%s: cannot initialize default policy table: %d\n",
4729  __func__, err);
4730  goto out;
4731  }
4732 
4733  err = register_pernet_subsys(&addrconf_ops);
4734  if (err < 0)
4735  goto out_addrlabel;
4736 
4737  /* The addrconf netdev notifier requires that loopback_dev
4738  * has it's ipv6 private information allocated and setup
4739  * before it can bring up and give link-local addresses
4740  * to other devices which are up.
4741  *
4742  * Unfortunately, loopback_dev is not necessarily the first
4743  * entry in the global dev_base list of net devices. In fact,
4744  * it is likely to be the very last entry on that list.
4745  * So this causes the notifier registry below to try and
4746  * give link-local addresses to all devices besides loopback_dev
4747  * first, then loopback_dev, which cases all the non-loopback_dev
4748  * devices to fail to get a link-local address.
4749  *
4750  * So, as a temporary fix, allocate the ipv6 structure for
4751  * loopback_dev first by hand.
4752  * Longer term, all of the dependencies ipv6 has upon the loopback
4753  * device and it being up should be removed.
4754  */
4755  rtnl_lock();
4756  if (!ipv6_add_dev(init_net.loopback_dev))
4757  err = -ENOMEM;
4758  rtnl_unlock();
4759  if (err)
4760  goto errlo;
4761 
4762  for (i = 0; i < IN6_ADDR_HSIZE; i++)
4763  INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4764 
4765  register_netdevice_notifier(&ipv6_dev_notf);
4766 
4767  addrconf_verify(0);
4768 
4769  err = rtnl_af_register(&inet6_ops);
4770  if (err < 0)
4771  goto errout_af;
4772 
4773  err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4774  NULL);
4775  if (err < 0)
4776  goto errout;
4777 
4778  /* Only the first call to __rtnl_register can fail */
4779  __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4780  __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4781  __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4782  inet6_dump_ifaddr, NULL);
4783  __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4784  inet6_dump_ifmcaddr, NULL);
4785  __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4786  inet6_dump_ifacaddr, NULL);
4787 
4788  ipv6_addr_label_rtnl_register();
4789 
4790  return 0;
4791 errout:
4792  rtnl_af_unregister(&inet6_ops);
4793 errout_af:
4794  unregister_netdevice_notifier(&ipv6_dev_notf);
4795 errlo:
4796  unregister_pernet_subsys(&addrconf_ops);
4797 out_addrlabel:
4798  ipv6_addr_label_cleanup();
4799 out:
4800  return err;
4801 }
4802 
4803 void addrconf_cleanup(void)
4804 {
4805  struct net_device *dev;
4806  int i;
4807 
4808  unregister_netdevice_notifier(&ipv6_dev_notf);
4809  unregister_pernet_subsys(&addrconf_ops);
4810  ipv6_addr_label_cleanup();
4811 
4812  rtnl_lock();
4813 
4814  __rtnl_af_unregister(&inet6_ops);
4815 
4816  /* clean dev list */
4817  for_each_netdev(&init_net, dev) {
4818  if (__in6_dev_get(dev) == NULL)
4819  continue;
4820  addrconf_ifdown(dev, 1);
4821  }
4822  addrconf_ifdown(init_net.loopback_dev, 2);
4823 
4824  /*
4825  * Check hash table.
4826  */
4827  spin_lock_bh(&addrconf_hash_lock);
4828  for (i = 0; i < IN6_ADDR_HSIZE; i++)
4829  WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4830  spin_unlock_bh(&addrconf_hash_lock);
4831 
4832  del_timer(&addr_chk_timer);
4833  rtnl_unlock();
4834 }
Generated on Thu Jan 10 2013 14:59:06 for Linux Kernel by   doxygen 1.8.2