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Linux/net/ipv6/addrconf.c

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  1 /*
  2  *      IPv6 Address [auto]configuration
  3  *      Linux INET6 implementation
  4  *
  5  *      Authors:
  6  *      Pedro Roque             <roque@di.fc.ul.pt>
  7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
  8  *
  9  *      This program is free software; you can redistribute it and/or
 10  *      modify it under the terms of the GNU General Public License
 11  *      as published by the Free Software Foundation; either version
 12  *      2 of the License, or (at your option) any later version.
 13  */
 14 
 15 /*
 16  *      Changes:
 17  *
 18  *      Janos Farkas                    :       delete timer on ifdown
 19  *      <chexum@bankinf.banki.hu>
 20  *      Andi Kleen                      :       kill double kfree on module
 21  *                                              unload.
 22  *      Maciej W. Rozycki               :       FDDI support
 23  *      sekiya@USAGI                    :       Don't send too many RS
 24  *                                              packets.
 25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
 26  *                                              packets.
 27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
 28  *                                              address validation timer.
 29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
 30  *                                              support.
 31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
 32  *                                              address on a same interface.
 33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
 34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
 35  *                                              seq_file.
 36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
 37  *                                              selection; consider scope,
 38  *                                              status etc.
 39  */
 40 
 41 #include <linux/errno.h>
 42 #include <linux/types.h>
 43 #include <linux/kernel.h>
 44 #include <linux/socket.h>
 45 #include <linux/sockios.h>
 46 #include <linux/net.h>
 47 #include <linux/in6.h>
 48 #include <linux/netdevice.h>
 49 #include <linux/if_addr.h>
 50 #include <linux/if_arp.h>
 51 #include <linux/if_arcnet.h>
 52 #include <linux/if_infiniband.h>
 53 #include <linux/route.h>
 54 #include <linux/inetdevice.h>
 55 #include <linux/init.h>
 56 #ifdef CONFIG_SYSCTL
 57 #include <linux/sysctl.h>
 58 #endif
 59 #include <linux/capability.h>
 60 #include <linux/delay.h>
 61 #include <linux/notifier.h>
 62 #include <linux/string.h>
 63 
 64 #include <net/net_namespace.h>
 65 #include <net/sock.h>
 66 #include <net/snmp.h>
 67 
 68 #include <net/ipv6.h>
 69 #include <net/protocol.h>
 70 #include <net/ndisc.h>
 71 #include <net/ip6_route.h>
 72 #include <net/addrconf.h>
 73 #include <net/tcp.h>
 74 #include <net/ip.h>
 75 #include <net/netlink.h>
 76 #include <net/pkt_sched.h>
 77 #include <linux/if_tunnel.h>
 78 #include <linux/rtnetlink.h>
 79 
 80 #ifdef CONFIG_IPV6_PRIVACY
 81 #include <linux/random.h>
 82 #endif
 83 
 84 #include <asm/uaccess.h>
 85 #include <asm/unaligned.h>
 86 
 87 #include <linux/proc_fs.h>
 88 #include <linux/seq_file.h>
 89 
 90 /* Set to 3 to get tracing... */
 91 #define ACONF_DEBUG 2
 92 
 93 #if ACONF_DEBUG >= 3
 94 #define ADBG(x) printk x
 95 #else
 96 #define ADBG(x)
 97 #endif
 98 
 99 #define INFINITY_LIFE_TIME      0xFFFFFFFF
100 #define TIME_DELTA(a,b) ((unsigned long)((long)(a) - (long)(b)))
101 
102 #ifdef CONFIG_SYSCTL
103 static void addrconf_sysctl_register(struct inet6_dev *idev);
104 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
105 #else
106 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
107 {
108 }
109 
110 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
111 {
112 }
113 #endif
114 
115 #ifdef CONFIG_IPV6_PRIVACY
116 static int __ipv6_regen_rndid(struct inet6_dev *idev);
117 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
118 static void ipv6_regen_rndid(unsigned long data);
119 
120 static int desync_factor = MAX_DESYNC_FACTOR * HZ;
121 #endif
122 
123 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
124 static int ipv6_count_addresses(struct inet6_dev *idev);
125 
126 /*
127  *      Configured unicast address hash table
128  */
129 static struct inet6_ifaddr              *inet6_addr_lst[IN6_ADDR_HSIZE];
130 static DEFINE_RWLOCK(addrconf_hash_lock);
131 
132 static void addrconf_verify(unsigned long);
133 
134 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
135 static DEFINE_SPINLOCK(addrconf_verify_lock);
136 
137 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
138 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
139 
140 static void addrconf_bonding_change(struct net_device *dev,
141                                     unsigned long event);
142 static int addrconf_ifdown(struct net_device *dev, int how);
143 
144 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags);
145 static void addrconf_dad_timer(unsigned long data);
146 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
147 static void addrconf_dad_run(struct inet6_dev *idev);
148 static void addrconf_rs_timer(unsigned long data);
149 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
150 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
151 
152 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
153                                 struct prefix_info *pinfo);
154 static int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
155                               struct net_device *dev);
156 
157 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
158 
159 static struct ipv6_devconf ipv6_devconf __read_mostly = {
160         .forwarding             = 0,
161         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
162         .mtu6                   = IPV6_MIN_MTU,
163         .accept_ra              = 1,
164         .accept_redirects       = 1,
165         .autoconf               = 1,
166         .force_mld_version      = 0,
167         .dad_transmits          = 1,
168         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
169         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
170         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
171 #ifdef CONFIG_IPV6_PRIVACY
172         .use_tempaddr           = 0,
173         .temp_valid_lft         = TEMP_VALID_LIFETIME,
174         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
175         .regen_max_retry        = REGEN_MAX_RETRY,
176         .max_desync_factor      = MAX_DESYNC_FACTOR,
177 #endif
178         .max_addresses          = IPV6_MAX_ADDRESSES,
179         .accept_ra_defrtr       = 1,
180         .accept_ra_pinfo        = 1,
181 #ifdef CONFIG_IPV6_ROUTER_PREF
182         .accept_ra_rtr_pref     = 1,
183         .rtr_probe_interval     = 60 * HZ,
184 #ifdef CONFIG_IPV6_ROUTE_INFO
185         .accept_ra_rt_info_max_plen = 0,
186 #endif
187 #endif
188         .proxy_ndp              = 0,
189         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
190         .disable_ipv6           = 0,
191         .accept_dad             = 1,
192 };
193 
194 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
195         .forwarding             = 0,
196         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
197         .mtu6                   = IPV6_MIN_MTU,
198         .accept_ra              = 1,
199         .accept_redirects       = 1,
200         .autoconf               = 1,
201         .dad_transmits          = 1,
202         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
203         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
204         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
205 #ifdef CONFIG_IPV6_PRIVACY
206         .use_tempaddr           = 0,
207         .temp_valid_lft         = TEMP_VALID_LIFETIME,
208         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
209         .regen_max_retry        = REGEN_MAX_RETRY,
210         .max_desync_factor      = MAX_DESYNC_FACTOR,
211 #endif
212         .max_addresses          = IPV6_MAX_ADDRESSES,
213         .accept_ra_defrtr       = 1,
214         .accept_ra_pinfo        = 1,
215 #ifdef CONFIG_IPV6_ROUTER_PREF
216         .accept_ra_rtr_pref     = 1,
217         .rtr_probe_interval     = 60 * HZ,
218 #ifdef CONFIG_IPV6_ROUTE_INFO
219         .accept_ra_rt_info_max_plen = 0,
220 #endif
221 #endif
222         .proxy_ndp              = 0,
223         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
224         .disable_ipv6           = 0,
225         .accept_dad             = 1,
226 };
227 
228 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
229 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
230 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
231 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
232 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
233 
234 /* Check if a valid qdisc is available */
235 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
236 {
237         return !qdisc_tx_is_noop(dev);
238 }
239 
240 /* Check if a route is valid prefix route */
241 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
242 {
243         return ((rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0);
244 }
245 
246 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
247 {
248         if (del_timer(&ifp->timer))
249                 __in6_ifa_put(ifp);
250 }
251 
252 enum addrconf_timer_t
253 {
254         AC_NONE,
255         AC_DAD,
256         AC_RS,
257 };
258 
259 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
260                                enum addrconf_timer_t what,
261                                unsigned long when)
262 {
263         if (!del_timer(&ifp->timer))
264                 in6_ifa_hold(ifp);
265 
266         switch (what) {
267         case AC_DAD:
268                 ifp->timer.function = addrconf_dad_timer;
269                 break;
270         case AC_RS:
271                 ifp->timer.function = addrconf_rs_timer;
272                 break;
273         default:;
274         }
275         ifp->timer.expires = jiffies + when;
276         add_timer(&ifp->timer);
277 }
278 
279 static int snmp6_alloc_dev(struct inet6_dev *idev)
280 {
281         if (snmp_mib_init((void **)idev->stats.ipv6,
282                           sizeof(struct ipstats_mib)) < 0)
283                 goto err_ip;
284         if (snmp_mib_init((void **)idev->stats.icmpv6,
285                           sizeof(struct icmpv6_mib)) < 0)
286                 goto err_icmp;
287         if (snmp_mib_init((void **)idev->stats.icmpv6msg,
288                           sizeof(struct icmpv6msg_mib)) < 0)
289                 goto err_icmpmsg;
290 
291         return 0;
292 
293 err_icmpmsg:
294         snmp_mib_free((void **)idev->stats.icmpv6);
295 err_icmp:
296         snmp_mib_free((void **)idev->stats.ipv6);
297 err_ip:
298         return -ENOMEM;
299 }
300 
301 static void snmp6_free_dev(struct inet6_dev *idev)
302 {
303         snmp_mib_free((void **)idev->stats.icmpv6msg);
304         snmp_mib_free((void **)idev->stats.icmpv6);
305         snmp_mib_free((void **)idev->stats.ipv6);
306 }
307 
308 /* Nobody refers to this device, we may destroy it. */
309 
310 static void in6_dev_finish_destroy_rcu(struct rcu_head *head)
311 {
312         struct inet6_dev *idev = container_of(head, struct inet6_dev, rcu);
313         kfree(idev);
314 }
315 
316 void in6_dev_finish_destroy(struct inet6_dev *idev)
317 {
318         struct net_device *dev = idev->dev;
319 
320         WARN_ON(idev->addr_list != NULL);
321         WARN_ON(idev->mc_list != NULL);
322 
323 #ifdef NET_REFCNT_DEBUG
324         printk(KERN_DEBUG "in6_dev_finish_destroy: %s\n", dev ? dev->name : "NIL");
325 #endif
326         dev_put(dev);
327         if (!idev->dead) {
328                 printk("Freeing alive inet6 device %p\n", idev);
329                 return;
330         }
331         snmp6_free_dev(idev);
332         call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
333 }
334 
335 EXPORT_SYMBOL(in6_dev_finish_destroy);
336 
337 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
338 {
339         struct inet6_dev *ndev;
340 
341         ASSERT_RTNL();
342 
343         if (dev->mtu < IPV6_MIN_MTU)
344                 return NULL;
345 
346         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
347 
348         if (ndev == NULL)
349                 return NULL;
350 
351         rwlock_init(&ndev->lock);
352         ndev->dev = dev;
353         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
354         ndev->cnf.mtu6 = dev->mtu;
355         ndev->cnf.sysctl = NULL;
356         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
357         if (ndev->nd_parms == NULL) {
358                 kfree(ndev);
359                 return NULL;
360         }
361         if (ndev->cnf.forwarding)
362                 dev_disable_lro(dev);
363         /* We refer to the device */
364         dev_hold(dev);
365 
366         if (snmp6_alloc_dev(ndev) < 0) {
367                 ADBG((KERN_WARNING
368                         "%s(): cannot allocate memory for statistics; dev=%s.\n",
369                         __func__, dev->name));
370                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
371                 ndev->dead = 1;
372                 in6_dev_finish_destroy(ndev);
373                 return NULL;
374         }
375 
376         if (snmp6_register_dev(ndev) < 0) {
377                 ADBG((KERN_WARNING
378                         "%s(): cannot create /proc/net/dev_snmp6/%s\n",
379                         __func__, dev->name));
380                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
381                 ndev->dead = 1;
382                 in6_dev_finish_destroy(ndev);
383                 return NULL;
384         }
385 
386         /* One reference from device.  We must do this before
387          * we invoke __ipv6_regen_rndid().
388          */
389         in6_dev_hold(ndev);
390 
391         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
392                 ndev->cnf.accept_dad = -1;
393 
394 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
395         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
396                 printk(KERN_INFO
397                        "%s: Disabled Multicast RS\n",
398                        dev->name);
399                 ndev->cnf.rtr_solicits = 0;
400         }
401 #endif
402 
403 #ifdef CONFIG_IPV6_PRIVACY
404         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
405         if ((dev->flags&IFF_LOOPBACK) ||
406             dev->type == ARPHRD_TUNNEL ||
407             dev->type == ARPHRD_TUNNEL6 ||
408             dev->type == ARPHRD_SIT ||
409             dev->type == ARPHRD_NONE) {
410                 ndev->cnf.use_tempaddr = -1;
411         } else {
412                 in6_dev_hold(ndev);
413                 ipv6_regen_rndid((unsigned long) ndev);
414         }
415 #endif
416 
417         if (netif_running(dev) && addrconf_qdisc_ok(dev))
418                 ndev->if_flags |= IF_READY;
419 
420         ipv6_mc_init_dev(ndev);
421         ndev->tstamp = jiffies;
422         addrconf_sysctl_register(ndev);
423         /* protected by rtnl_lock */
424         rcu_assign_pointer(dev->ip6_ptr, ndev);
425 
426         /* Join all-node multicast group */
427         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
428 
429         return ndev;
430 }
431 
432 static struct inet6_dev * ipv6_find_idev(struct net_device *dev)
433 {
434         struct inet6_dev *idev;
435 
436         ASSERT_RTNL();
437 
438         if ((idev = __in6_dev_get(dev)) == NULL) {
439                 if ((idev = ipv6_add_dev(dev)) == NULL)
440                         return NULL;
441         }
442 
443         if (dev->flags&IFF_UP)
444                 ipv6_mc_up(idev);
445         return idev;
446 }
447 
448 #ifdef CONFIG_SYSCTL
449 static void dev_forward_change(struct inet6_dev *idev)
450 {
451         struct net_device *dev;
452         struct inet6_ifaddr *ifa;
453 
454         if (!idev)
455                 return;
456         dev = idev->dev;
457         if (idev->cnf.forwarding)
458                 dev_disable_lro(dev);
459         if (dev && (dev->flags & IFF_MULTICAST)) {
460                 if (idev->cnf.forwarding)
461                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
462                 else
463                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
464         }
465         for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
466                 if (ifa->flags&IFA_F_TENTATIVE)
467                         continue;
468                 if (idev->cnf.forwarding)
469                         addrconf_join_anycast(ifa);
470                 else
471                         addrconf_leave_anycast(ifa);
472         }
473 }
474 
475 
476 static void addrconf_forward_change(struct net *net, __s32 newf)
477 {
478         struct net_device *dev;
479         struct inet6_dev *idev;
480 
481         read_lock(&dev_base_lock);
482         for_each_netdev(net, dev) {
483                 rcu_read_lock();
484                 idev = __in6_dev_get(dev);
485                 if (idev) {
486                         int changed = (!idev->cnf.forwarding) ^ (!newf);
487                         idev->cnf.forwarding = newf;
488                         if (changed)
489                                 dev_forward_change(idev);
490                 }
491                 rcu_read_unlock();
492         }
493         read_unlock(&dev_base_lock);
494 }
495 
496 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int old)
497 {
498         struct net *net;
499 
500         net = (struct net *)table->extra2;
501         if (p == &net->ipv6.devconf_dflt->forwarding)
502                 return 0;
503 
504         if (!rtnl_trylock()) {
505                 /* Restore the original values before restarting */
506                 *p = old;
507                 return restart_syscall();
508         }
509 
510         if (p == &net->ipv6.devconf_all->forwarding) {
511                 __s32 newf = net->ipv6.devconf_all->forwarding;
512                 net->ipv6.devconf_dflt->forwarding = newf;
513                 addrconf_forward_change(net, newf);
514         } else if ((!*p) ^ (!old))
515                 dev_forward_change((struct inet6_dev *)table->extra1);
516         rtnl_unlock();
517 
518         if (*p)
519                 rt6_purge_dflt_routers(net);
520         return 1;
521 }
522 #endif
523 
524 /* Nobody refers to this ifaddr, destroy it */
525 
526 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
527 {
528         WARN_ON(ifp->if_next != NULL);
529         WARN_ON(ifp->lst_next != NULL);
530 
531 #ifdef NET_REFCNT_DEBUG
532         printk(KERN_DEBUG "inet6_ifa_finish_destroy\n");
533 #endif
534 
535         in6_dev_put(ifp->idev);
536 
537         if (del_timer(&ifp->timer))
538                 printk("Timer is still running, when freeing ifa=%p\n", ifp);
539 
540         if (!ifp->dead) {
541                 printk("Freeing alive inet6 address %p\n", ifp);
542                 return;
543         }
544         dst_release(&ifp->rt->u.dst);
545 
546         kfree(ifp);
547 }
548 
549 static void
550 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
551 {
552         struct inet6_ifaddr *ifa, **ifap;
553         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
554 
555         /*
556          * Each device address list is sorted in order of scope -
557          * global before linklocal.
558          */
559         for (ifap = &idev->addr_list; (ifa = *ifap) != NULL;
560              ifap = &ifa->if_next) {
561                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
562                         break;
563         }
564 
565         ifp->if_next = *ifap;
566         *ifap = ifp;
567 }
568 
569 /*
570  *      Hash function taken from net_alias.c
571  */
572 static u8 ipv6_addr_hash(const struct in6_addr *addr)
573 {
574         __u32 word;
575 
576         /*
577          * We perform the hash function over the last 64 bits of the address
578          * This will include the IEEE address token on links that support it.
579          */
580 
581         word = (__force u32)(addr->s6_addr32[2] ^ addr->s6_addr32[3]);
582         word ^= (word >> 16);
583         word ^= (word >> 8);
584 
585         return ((word ^ (word >> 4)) & 0x0f);
586 }
587 
588 /* On success it returns ifp with increased reference count */
589 
590 static struct inet6_ifaddr *
591 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
592               int scope, u32 flags)
593 {
594         struct inet6_ifaddr *ifa = NULL;
595         struct rt6_info *rt;
596         int hash;
597         int err = 0;
598         int addr_type = ipv6_addr_type(addr);
599 
600         if (addr_type == IPV6_ADDR_ANY ||
601             addr_type & IPV6_ADDR_MULTICAST ||
602             (!(idev->dev->flags & IFF_LOOPBACK) &&
603              addr_type & IPV6_ADDR_LOOPBACK))
604                 return ERR_PTR(-EADDRNOTAVAIL);
605 
606         rcu_read_lock_bh();
607         if (idev->dead) {
608                 err = -ENODEV;                  /*XXX*/
609                 goto out2;
610         }
611 
612         if (idev->cnf.disable_ipv6) {
613                 err = -EACCES;
614                 goto out2;
615         }
616 
617         write_lock(&addrconf_hash_lock);
618 
619         /* Ignore adding duplicate addresses on an interface */
620         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
621                 ADBG(("ipv6_add_addr: already assigned\n"));
622                 err = -EEXIST;
623                 goto out;
624         }
625 
626         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
627 
628         if (ifa == NULL) {
629                 ADBG(("ipv6_add_addr: malloc failed\n"));
630                 err = -ENOBUFS;
631                 goto out;
632         }
633 
634         rt = addrconf_dst_alloc(idev, addr, 0);
635         if (IS_ERR(rt)) {
636                 err = PTR_ERR(rt);
637                 goto out;
638         }
639 
640         ipv6_addr_copy(&ifa->addr, addr);
641 
642         spin_lock_init(&ifa->lock);
643         init_timer(&ifa->timer);
644         ifa->timer.data = (unsigned long) ifa;
645         ifa->scope = scope;
646         ifa->prefix_len = pfxlen;
647         ifa->flags = flags | IFA_F_TENTATIVE;
648         ifa->cstamp = ifa->tstamp = jiffies;
649 
650         ifa->rt = rt;
651 
652         /*
653          * part one of RFC 4429, section 3.3
654          * We should not configure an address as
655          * optimistic if we do not yet know the link
656          * layer address of our nexhop router
657          */
658 
659         if (rt->rt6i_nexthop == NULL)
660                 ifa->flags &= ~IFA_F_OPTIMISTIC;
661 
662         ifa->idev = idev;
663         in6_dev_hold(idev);
664         /* For caller */
665         in6_ifa_hold(ifa);
666 
667         /* Add to big hash table */
668         hash = ipv6_addr_hash(addr);
669 
670         ifa->lst_next = inet6_addr_lst[hash];
671         inet6_addr_lst[hash] = ifa;
672         in6_ifa_hold(ifa);
673         write_unlock(&addrconf_hash_lock);
674 
675         write_lock(&idev->lock);
676         /* Add to inet6_dev unicast addr list. */
677         ipv6_link_dev_addr(idev, ifa);
678 
679 #ifdef CONFIG_IPV6_PRIVACY
680         if (ifa->flags&IFA_F_TEMPORARY) {
681                 ifa->tmp_next = idev->tempaddr_list;
682                 idev->tempaddr_list = ifa;
683                 in6_ifa_hold(ifa);
684         }
685 #endif
686 
687         in6_ifa_hold(ifa);
688         write_unlock(&idev->lock);
689 out2:
690         rcu_read_unlock_bh();
691 
692         if (likely(err == 0))
693                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
694         else {
695                 kfree(ifa);
696                 ifa = ERR_PTR(err);
697         }
698 
699         return ifa;
700 out:
701         write_unlock(&addrconf_hash_lock);
702         goto out2;
703 }
704 
705 /* This function wants to get referenced ifp and releases it before return */
706 
707 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
708 {
709         struct inet6_ifaddr *ifa, **ifap;
710         struct inet6_dev *idev = ifp->idev;
711         int hash;
712         int deleted = 0, onlink = 0;
713         unsigned long expires = jiffies;
714 
715         hash = ipv6_addr_hash(&ifp->addr);
716 
717         ifp->dead = 1;
718 
719         write_lock_bh(&addrconf_hash_lock);
720         for (ifap = &inet6_addr_lst[hash]; (ifa=*ifap) != NULL;
721              ifap = &ifa->lst_next) {
722                 if (ifa == ifp) {
723                         *ifap = ifa->lst_next;
724                         __in6_ifa_put(ifp);
725                         ifa->lst_next = NULL;
726                         break;
727                 }
728         }
729         write_unlock_bh(&addrconf_hash_lock);
730 
731         write_lock_bh(&idev->lock);
732 #ifdef CONFIG_IPV6_PRIVACY
733         if (ifp->flags&IFA_F_TEMPORARY) {
734                 for (ifap = &idev->tempaddr_list; (ifa=*ifap) != NULL;
735                      ifap = &ifa->tmp_next) {
736                         if (ifa == ifp) {
737                                 *ifap = ifa->tmp_next;
738                                 if (ifp->ifpub) {
739                                         in6_ifa_put(ifp->ifpub);
740                                         ifp->ifpub = NULL;
741                                 }
742                                 __in6_ifa_put(ifp);
743                                 ifa->tmp_next = NULL;
744                                 break;
745                         }
746                 }
747         }
748 #endif
749 
750         for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
751                 if (ifa == ifp) {
752                         *ifap = ifa->if_next;
753                         __in6_ifa_put(ifp);
754                         ifa->if_next = NULL;
755                         if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
756                                 break;
757                         deleted = 1;
758                         continue;
759                 } else if (ifp->flags & IFA_F_PERMANENT) {
760                         if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
761                                               ifp->prefix_len)) {
762                                 if (ifa->flags & IFA_F_PERMANENT) {
763                                         onlink = 1;
764                                         if (deleted)
765                                                 break;
766                                 } else {
767                                         unsigned long lifetime;
768 
769                                         if (!onlink)
770                                                 onlink = -1;
771 
772                                         spin_lock(&ifa->lock);
773 
774                                         lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
775                                         /*
776                                          * Note: Because this address is
777                                          * not permanent, lifetime <
778                                          * LONG_MAX / HZ here.
779                                          */
780                                         if (time_before(expires,
781                                                         ifa->tstamp + lifetime * HZ))
782                                                 expires = ifa->tstamp + lifetime * HZ;
783                                         spin_unlock(&ifa->lock);
784                                 }
785                         }
786                 }
787                 ifap = &ifa->if_next;
788         }
789         write_unlock_bh(&idev->lock);
790 
791         addrconf_del_timer(ifp);
792 
793         ipv6_ifa_notify(RTM_DELADDR, ifp);
794 
795         atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
796 
797         /*
798          * Purge or update corresponding prefix
799          *
800          * 1) we don't purge prefix here if address was not permanent.
801          *    prefix is managed by its own lifetime.
802          * 2) if there're no addresses, delete prefix.
803          * 3) if there're still other permanent address(es),
804          *    corresponding prefix is still permanent.
805          * 4) otherwise, update prefix lifetime to the
806          *    longest valid lifetime among the corresponding
807          *    addresses on the device.
808          *    Note: subsequent RA will update lifetime.
809          *
810          * --yoshfuji
811          */
812         if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
813                 struct in6_addr prefix;
814                 struct rt6_info *rt;
815                 struct net *net = dev_net(ifp->idev->dev);
816                 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
817                 rt = rt6_lookup(net, &prefix, NULL, ifp->idev->dev->ifindex, 1);
818 
819                 if (rt && addrconf_is_prefix_route(rt)) {
820                         if (onlink == 0) {
821                                 ip6_del_rt(rt);
822                                 rt = NULL;
823                         } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
824                                 rt->rt6i_expires = expires;
825                                 rt->rt6i_flags |= RTF_EXPIRES;
826                         }
827                 }
828                 dst_release(&rt->u.dst);
829         }
830 
831         in6_ifa_put(ifp);
832 }
833 
834 #ifdef CONFIG_IPV6_PRIVACY
835 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
836 {
837         struct inet6_dev *idev = ifp->idev;
838         struct in6_addr addr, *tmpaddr;
839         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_cstamp, tmp_tstamp;
840         unsigned long regen_advance;
841         int tmp_plen;
842         int ret = 0;
843         int max_addresses;
844         u32 addr_flags;
845 
846         write_lock(&idev->lock);
847         if (ift) {
848                 spin_lock_bh(&ift->lock);
849                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
850                 spin_unlock_bh(&ift->lock);
851                 tmpaddr = &addr;
852         } else {
853                 tmpaddr = NULL;
854         }
855 retry:
856         in6_dev_hold(idev);
857         if (idev->cnf.use_tempaddr <= 0) {
858                 write_unlock(&idev->lock);
859                 printk(KERN_INFO
860                         "ipv6_create_tempaddr(): use_tempaddr is disabled.\n");
861                 in6_dev_put(idev);
862                 ret = -1;
863                 goto out;
864         }
865         spin_lock_bh(&ifp->lock);
866         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
867                 idev->cnf.use_tempaddr = -1;    /*XXX*/
868                 spin_unlock_bh(&ifp->lock);
869                 write_unlock(&idev->lock);
870                 printk(KERN_WARNING
871                         "ipv6_create_tempaddr(): regeneration time exceeded. disabled temporary address support.\n");
872                 in6_dev_put(idev);
873                 ret = -1;
874                 goto out;
875         }
876         in6_ifa_hold(ifp);
877         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
878         if (__ipv6_try_regen_rndid(idev, tmpaddr) < 0) {
879                 spin_unlock_bh(&ifp->lock);
880                 write_unlock(&idev->lock);
881                 printk(KERN_WARNING
882                         "ipv6_create_tempaddr(): regeneration of randomized interface id failed.\n");
883                 in6_ifa_put(ifp);
884                 in6_dev_put(idev);
885                 ret = -1;
886                 goto out;
887         }
888         memcpy(&addr.s6_addr[8], idev->rndid, 8);
889         tmp_valid_lft = min_t(__u32,
890                               ifp->valid_lft,
891                               idev->cnf.temp_valid_lft);
892         tmp_prefered_lft = min_t(__u32,
893                                  ifp->prefered_lft,
894                                  idev->cnf.temp_prefered_lft - desync_factor / HZ);
895         tmp_plen = ifp->prefix_len;
896         max_addresses = idev->cnf.max_addresses;
897         tmp_cstamp = ifp->cstamp;
898         tmp_tstamp = ifp->tstamp;
899         spin_unlock_bh(&ifp->lock);
900 
901         regen_advance = idev->cnf.regen_max_retry *
902                         idev->cnf.dad_transmits *
903                         idev->nd_parms->retrans_time / HZ;
904         write_unlock(&idev->lock);
905 
906         /* A temporary address is created only if this calculated Preferred
907          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
908          * an implementation must not create a temporary address with a zero
909          * Preferred Lifetime.
910          */
911         if (tmp_prefered_lft <= regen_advance) {
912                 in6_ifa_put(ifp);
913                 in6_dev_put(idev);
914                 ret = -1;
915                 goto out;
916         }
917 
918         addr_flags = IFA_F_TEMPORARY;
919         /* set in addrconf_prefix_rcv() */
920         if (ifp->flags & IFA_F_OPTIMISTIC)
921                 addr_flags |= IFA_F_OPTIMISTIC;
922 
923         ift = ipv6_add_addr(idev, &addr, tmp_plen,
924                             ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
925                             addr_flags);
926         if (IS_ERR(ift)) {
927                 in6_ifa_put(ifp);
928                 in6_dev_put(idev);
929                 printk(KERN_INFO
930                         "ipv6_create_tempaddr(): retry temporary address regeneration.\n");
931                 tmpaddr = &addr;
932                 write_lock(&idev->lock);
933                 goto retry;
934         }
935 
936         spin_lock_bh(&ift->lock);
937         ift->ifpub = ifp;
938         ift->valid_lft = tmp_valid_lft;
939         ift->prefered_lft = tmp_prefered_lft;
940         ift->cstamp = tmp_cstamp;
941         ift->tstamp = tmp_tstamp;
942         spin_unlock_bh(&ift->lock);
943 
944         addrconf_dad_start(ift, 0);
945         in6_ifa_put(ift);
946         in6_dev_put(idev);
947 out:
948         return ret;
949 }
950 #endif
951 
952 /*
953  *      Choose an appropriate source address (RFC3484)
954  */
955 enum {
956         IPV6_SADDR_RULE_INIT = 0,
957         IPV6_SADDR_RULE_LOCAL,
958         IPV6_SADDR_RULE_SCOPE,
959         IPV6_SADDR_RULE_PREFERRED,
960 #ifdef CONFIG_IPV6_MIP6
961         IPV6_SADDR_RULE_HOA,
962 #endif
963         IPV6_SADDR_RULE_OIF,
964         IPV6_SADDR_RULE_LABEL,
965 #ifdef CONFIG_IPV6_PRIVACY
966         IPV6_SADDR_RULE_PRIVACY,
967 #endif
968         IPV6_SADDR_RULE_ORCHID,
969         IPV6_SADDR_RULE_PREFIX,
970         IPV6_SADDR_RULE_MAX
971 };
972 
973 struct ipv6_saddr_score {
974         int                     rule;
975         int                     addr_type;
976         struct inet6_ifaddr     *ifa;
977         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
978         int                     scopedist;
979         int                     matchlen;
980 };
981 
982 struct ipv6_saddr_dst {
983         const struct in6_addr *addr;
984         int ifindex;
985         int scope;
986         int label;
987         unsigned int prefs;
988 };
989 
990 static inline int ipv6_saddr_preferred(int type)
991 {
992         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|
993                     IPV6_ADDR_LOOPBACK|IPV6_ADDR_RESERVED))
994                 return 1;
995         return 0;
996 }
997 
998 static int ipv6_get_saddr_eval(struct net *net,
999                                struct ipv6_saddr_score *score,
1000                                struct ipv6_saddr_dst *dst,
1001                                int i)
1002 {
1003         int ret;
1004 
1005         if (i <= score->rule) {
1006                 switch (i) {
1007                 case IPV6_SADDR_RULE_SCOPE:
1008                         ret = score->scopedist;
1009                         break;
1010                 case IPV6_SADDR_RULE_PREFIX:
1011                         ret = score->matchlen;
1012                         break;
1013                 default:
1014                         ret = !!test_bit(i, score->scorebits);
1015                 }
1016                 goto out;
1017         }
1018 
1019         switch (i) {
1020         case IPV6_SADDR_RULE_INIT:
1021                 /* Rule 0: remember if hiscore is not ready yet */
1022                 ret = !!score->ifa;
1023                 break;
1024         case IPV6_SADDR_RULE_LOCAL:
1025                 /* Rule 1: Prefer same address */
1026                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1027                 break;
1028         case IPV6_SADDR_RULE_SCOPE:
1029                 /* Rule 2: Prefer appropriate scope
1030                  *
1031                  *      ret
1032                  *       ^
1033                  *    -1 |  d 15
1034                  *    ---+--+-+---> scope
1035                  *       |
1036                  *       |             d is scope of the destination.
1037                  *  B-d  |  \
1038                  *       |   \      <- smaller scope is better if
1039                  *  B-15 |    \        if scope is enough for destinaion.
1040                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1041                  * d-C-1 | /
1042                  *       |/         <- greater is better
1043                  *   -C  /             if scope is not enough for destination.
1044                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1045                  *
1046                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1047                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1048                  * Assume B = 0 and we get C > 29.
1049                  */
1050                 ret = __ipv6_addr_src_scope(score->addr_type);
1051                 if (ret >= dst->scope)
1052                         ret = -ret;
1053                 else
1054                         ret -= 128;     /* 30 is enough */
1055                 score->scopedist = ret;
1056                 break;
1057         case IPV6_SADDR_RULE_PREFERRED:
1058                 /* Rule 3: Avoid deprecated and optimistic addresses */
1059                 ret = ipv6_saddr_preferred(score->addr_type) ||
1060                       !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1061                 break;
1062 #ifdef CONFIG_IPV6_MIP6
1063         case IPV6_SADDR_RULE_HOA:
1064             {
1065                 /* Rule 4: Prefer home address */
1066                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1067                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1068                 break;
1069             }
1070 #endif
1071         case IPV6_SADDR_RULE_OIF:
1072                 /* Rule 5: Prefer outgoing interface */
1073                 ret = (!dst->ifindex ||
1074                        dst->ifindex == score->ifa->idev->dev->ifindex);
1075                 break;
1076         case IPV6_SADDR_RULE_LABEL:
1077                 /* Rule 6: Prefer matching label */
1078                 ret = ipv6_addr_label(net,
1079                                       &score->ifa->addr, score->addr_type,
1080                                       score->ifa->idev->dev->ifindex) == dst->label;
1081                 break;
1082 #ifdef CONFIG_IPV6_PRIVACY
1083         case IPV6_SADDR_RULE_PRIVACY:
1084             {
1085                 /* Rule 7: Prefer public address
1086                  * Note: prefer temprary address if use_tempaddr >= 2
1087                  */
1088                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1089                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1090                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1091                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1092                 break;
1093             }
1094 #endif
1095         case IPV6_SADDR_RULE_ORCHID:
1096                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1097                  *          non-ORCHID vs non-ORCHID
1098                  */
1099                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1100                         ipv6_addr_orchid(dst->addr));
1101                 break;
1102         case IPV6_SADDR_RULE_PREFIX:
1103                 /* Rule 8: Use longest matching prefix */
1104                 score->matchlen = ret = ipv6_addr_diff(&score->ifa->addr,
1105                                                        dst->addr);
1106                 break;
1107         default:
1108                 ret = 0;
1109         }
1110 
1111         if (ret)
1112                 __set_bit(i, score->scorebits);
1113         score->rule = i;
1114 out:
1115         return ret;
1116 }
1117 
1118 int ipv6_dev_get_saddr(struct net *net, struct net_device *dst_dev,
1119                        const struct in6_addr *daddr, unsigned int prefs,
1120                        struct in6_addr *saddr)
1121 {
1122         struct ipv6_saddr_score scores[2],
1123                                 *score = &scores[0], *hiscore = &scores[1];
1124         struct ipv6_saddr_dst dst;
1125         struct net_device *dev;
1126         int dst_type;
1127 
1128         dst_type = __ipv6_addr_type(daddr);
1129         dst.addr = daddr;
1130         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1131         dst.scope = __ipv6_addr_src_scope(dst_type);
1132         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1133         dst.prefs = prefs;
1134 
1135         hiscore->rule = -1;
1136         hiscore->ifa = NULL;
1137 
1138         read_lock(&dev_base_lock);
1139         rcu_read_lock();
1140 
1141         for_each_netdev(net, dev) {
1142                 struct inet6_dev *idev;
1143 
1144                 /* Candidate Source Address (section 4)
1145                  *  - multicast and link-local destination address,
1146                  *    the set of candidate source address MUST only
1147                  *    include addresses assigned to interfaces
1148                  *    belonging to the same link as the outgoing
1149                  *    interface.
1150                  * (- For site-local destination addresses, the
1151                  *    set of candidate source addresses MUST only
1152                  *    include addresses assigned to interfaces
1153                  *    belonging to the same site as the outgoing
1154                  *    interface.)
1155                  */
1156                 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1157                      dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1158                     dst.ifindex && dev->ifindex != dst.ifindex)
1159                         continue;
1160 
1161                 idev = __in6_dev_get(dev);
1162                 if (!idev)
1163                         continue;
1164 
1165                 read_lock_bh(&idev->lock);
1166                 for (score->ifa = idev->addr_list; score->ifa; score->ifa = score->ifa->if_next) {
1167                         int i;
1168 
1169                         /*
1170                          * - Tentative Address (RFC2462 section 5.4)
1171                          *  - A tentative address is not considered
1172                          *    "assigned to an interface" in the traditional
1173                          *    sense, unless it is also flagged as optimistic.
1174                          * - Candidate Source Address (section 4)
1175                          *  - In any case, anycast addresses, multicast
1176                          *    addresses, and the unspecified address MUST
1177                          *    NOT be included in a candidate set.
1178                          */
1179                         if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1180                             (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1181                                 continue;
1182 
1183                         score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1184 
1185                         if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1186                                      score->addr_type & IPV6_ADDR_MULTICAST)) {
1187                                 LIMIT_NETDEBUG(KERN_DEBUG
1188                                                "ADDRCONF: unspecified / multicast address "
1189                                                "assigned as unicast address on %s",
1190                                                dev->name);
1191                                 continue;
1192                         }
1193 
1194                         score->rule = -1;
1195                         bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1196 
1197                         for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1198                                 int minihiscore, miniscore;
1199 
1200                                 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1201                                 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1202 
1203                                 if (minihiscore > miniscore) {
1204                                         if (i == IPV6_SADDR_RULE_SCOPE &&
1205                                             score->scopedist > 0) {
1206                                                 /*
1207                                                  * special case:
1208                                                  * each remaining entry
1209                                                  * has too small (not enough)
1210                                                  * scope, because ifa entries
1211                                                  * are sorted by their scope
1212                                                  * values.
1213                                                  */
1214                                                 goto try_nextdev;
1215                                         }
1216                                         break;
1217                                 } else if (minihiscore < miniscore) {
1218                                         if (hiscore->ifa)
1219                                                 in6_ifa_put(hiscore->ifa);
1220 
1221                                         in6_ifa_hold(score->ifa);
1222 
1223                                         swap(hiscore, score);
1224 
1225                                         /* restore our iterator */
1226                                         score->ifa = hiscore->ifa;
1227 
1228                                         break;
1229                                 }
1230                         }
1231                 }
1232 try_nextdev:
1233                 read_unlock_bh(&idev->lock);
1234         }
1235         rcu_read_unlock();
1236         read_unlock(&dev_base_lock);
1237 
1238         if (!hiscore->ifa)
1239                 return -EADDRNOTAVAIL;
1240 
1241         ipv6_addr_copy(saddr, &hiscore->ifa->addr);
1242         in6_ifa_put(hiscore->ifa);
1243         return 0;
1244 }
1245 
1246 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1247 
1248 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1249                     unsigned char banned_flags)
1250 {
1251         struct inet6_dev *idev;
1252         int err = -EADDRNOTAVAIL;
1253 
1254         rcu_read_lock();
1255         if ((idev = __in6_dev_get(dev)) != NULL) {
1256                 struct inet6_ifaddr *ifp;
1257 
1258                 read_lock_bh(&idev->lock);
1259                 for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1260                         if (ifp->scope == IFA_LINK && !(ifp->flags & banned_flags)) {
1261                                 ipv6_addr_copy(addr, &ifp->addr);
1262                                 err = 0;
1263                                 break;
1264                         }
1265                 }
1266                 read_unlock_bh(&idev->lock);
1267         }
1268         rcu_read_unlock();
1269         return err;
1270 }
1271 
1272 static int ipv6_count_addresses(struct inet6_dev *idev)
1273 {
1274         int cnt = 0;
1275         struct inet6_ifaddr *ifp;
1276 
1277         read_lock_bh(&idev->lock);
1278         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next)
1279                 cnt++;
1280         read_unlock_bh(&idev->lock);
1281         return cnt;
1282 }
1283 
1284 int ipv6_chk_addr(struct net *net, struct in6_addr *addr,
1285                   struct net_device *dev, int strict)
1286 {
1287         struct inet6_ifaddr * ifp;
1288         u8 hash = ipv6_addr_hash(addr);
1289 
1290         read_lock_bh(&addrconf_hash_lock);
1291         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1292                 if (!net_eq(dev_net(ifp->idev->dev), net))
1293                         continue;
1294                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1295                     !(ifp->flags&IFA_F_TENTATIVE)) {
1296                         if (dev == NULL || ifp->idev->dev == dev ||
1297                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))
1298                                 break;
1299                 }
1300         }
1301         read_unlock_bh(&addrconf_hash_lock);
1302         return ifp != NULL;
1303 }
1304 EXPORT_SYMBOL(ipv6_chk_addr);
1305 
1306 static
1307 int ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1308                        struct net_device *dev)
1309 {
1310         struct inet6_ifaddr * ifp;
1311         u8 hash = ipv6_addr_hash(addr);
1312 
1313         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1314                 if (!net_eq(dev_net(ifp->idev->dev), net))
1315                         continue;
1316                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1317                         if (dev == NULL || ifp->idev->dev == dev)
1318                                 break;
1319                 }
1320         }
1321         return ifp != NULL;
1322 }
1323 
1324 int ipv6_chk_prefix(struct in6_addr *addr, struct net_device *dev)
1325 {
1326         struct inet6_dev *idev;
1327         struct inet6_ifaddr *ifa;
1328         int     onlink;
1329 
1330         onlink = 0;
1331         rcu_read_lock();
1332         idev = __in6_dev_get(dev);
1333         if (idev) {
1334                 read_lock_bh(&idev->lock);
1335                 for (ifa = idev->addr_list; ifa; ifa = ifa->if_next) {
1336                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1337                                                    ifa->prefix_len);
1338                         if (onlink)
1339                                 break;
1340                 }
1341                 read_unlock_bh(&idev->lock);
1342         }
1343         rcu_read_unlock();
1344         return onlink;
1345 }
1346 
1347 EXPORT_SYMBOL(ipv6_chk_prefix);
1348 
1349 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1350                                      struct net_device *dev, int strict)
1351 {
1352         struct inet6_ifaddr * ifp;
1353         u8 hash = ipv6_addr_hash(addr);
1354 
1355         read_lock_bh(&addrconf_hash_lock);
1356         for(ifp = inet6_addr_lst[hash]; ifp; ifp=ifp->lst_next) {
1357                 if (!net_eq(dev_net(ifp->idev->dev), net))
1358                         continue;
1359                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1360                         if (dev == NULL || ifp->idev->dev == dev ||
1361                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1362                                 in6_ifa_hold(ifp);
1363                                 break;
1364                         }
1365                 }
1366         }
1367         read_unlock_bh(&addrconf_hash_lock);
1368 
1369         return ifp;
1370 }
1371 
1372 /* Gets referenced address, destroys ifaddr */
1373 
1374 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1375 {
1376         if (ifp->flags&IFA_F_PERMANENT) {
1377                 spin_lock_bh(&ifp->lock);
1378                 addrconf_del_timer(ifp);
1379                 ifp->flags |= IFA_F_TENTATIVE;
1380                 if (dad_failed)
1381                         ifp->flags |= IFA_F_DADFAILED;
1382                 spin_unlock_bh(&ifp->lock);
1383                 in6_ifa_put(ifp);
1384 #ifdef CONFIG_IPV6_PRIVACY
1385         } else if (ifp->flags&IFA_F_TEMPORARY) {
1386                 struct inet6_ifaddr *ifpub;
1387                 spin_lock_bh(&ifp->lock);
1388                 ifpub = ifp->ifpub;
1389                 if (ifpub) {
1390                         in6_ifa_hold(ifpub);
1391                         spin_unlock_bh(&ifp->lock);
1392                         ipv6_create_tempaddr(ifpub, ifp);
1393                         in6_ifa_put(ifpub);
1394                 } else {
1395                         spin_unlock_bh(&ifp->lock);
1396                 }
1397                 ipv6_del_addr(ifp);
1398 #endif
1399         } else
1400                 ipv6_del_addr(ifp);
1401 }
1402 
1403 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1404 {
1405         struct inet6_dev *idev = ifp->idev;
1406 
1407         if (net_ratelimit())
1408                 printk(KERN_INFO "%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                         printk(KERN_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, 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, 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         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1458         if (ipv6_addr_any(&addr))
1459                 return;
1460         ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1461 }
1462 
1463 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1464 {
1465         struct in6_addr addr;
1466         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1467         if (ipv6_addr_any(&addr))
1468                 return;
1469         __ipv6_dev_ac_dec(ifp->idev, &addr);
1470 }
1471 
1472 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1473 {
1474         if (dev->addr_len != ETH_ALEN)
1475                 return -1;
1476         memcpy(eui, dev->dev_addr, 3);
1477         memcpy(eui + 5, dev->dev_addr + 3, 3);
1478 
1479         /*
1480          * The zSeries OSA network cards can be shared among various
1481          * OS instances, but the OSA cards have only one MAC address.
1482          * This leads to duplicate address conflicts in conjunction
1483          * with IPv6 if more than one instance uses the same card.
1484          *
1485          * The driver for these cards can deliver a unique 16-bit
1486          * identifier for each instance sharing the same card.  It is
1487          * placed instead of 0xFFFE in the interface identifier.  The
1488          * "u" bit of the interface identifier is not inverted in this
1489          * case.  Hence the resulting interface identifier has local
1490          * scope according to RFC2373.
1491          */
1492         if (dev->dev_id) {
1493                 eui[3] = (dev->dev_id >> 8) & 0xFF;
1494                 eui[4] = dev->dev_id & 0xFF;
1495         } else {
1496                 eui[3] = 0xFF;
1497                 eui[4] = 0xFE;
1498                 eui[0] ^= 2;
1499         }
1500         return 0;
1501 }
1502 
1503 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1504 {
1505         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1506         if (dev->addr_len != ARCNET_ALEN)
1507                 return -1;
1508         memset(eui, 0, 7);
1509         eui[7] = *(u8*)dev->dev_addr;
1510         return 0;
1511 }
1512 
1513 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1514 {
1515         if (dev->addr_len != INFINIBAND_ALEN)
1516                 return -1;
1517         memcpy(eui, dev->dev_addr + 12, 8);
1518         eui[0] |= 2;
1519         return 0;
1520 }
1521 
1522 int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1523 {
1524         if (addr == 0)
1525                 return -1;
1526         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1527                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1528                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1529                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1530                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1531                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1532         eui[1] = 0;
1533         eui[2] = 0x5E;
1534         eui[3] = 0xFE;
1535         memcpy(eui + 4, &addr, 4);
1536         return 0;
1537 }
1538 EXPORT_SYMBOL(__ipv6_isatap_ifid);
1539 
1540 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1541 {
1542         if (dev->priv_flags & IFF_ISATAP)
1543                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1544         return -1;
1545 }
1546 
1547 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1548 {
1549         switch (dev->type) {
1550         case ARPHRD_ETHER:
1551         case ARPHRD_FDDI:
1552         case ARPHRD_IEEE802_TR:
1553                 return addrconf_ifid_eui48(eui, dev);
1554         case ARPHRD_ARCNET:
1555                 return addrconf_ifid_arcnet(eui, dev);
1556         case ARPHRD_INFINIBAND:
1557                 return addrconf_ifid_infiniband(eui, dev);
1558         case ARPHRD_SIT:
1559                 return addrconf_ifid_sit(eui, dev);
1560         }
1561         return -1;
1562 }
1563 
1564 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1565 {
1566         int err = -1;
1567         struct inet6_ifaddr *ifp;
1568 
1569         read_lock_bh(&idev->lock);
1570         for (ifp=idev->addr_list; ifp; ifp=ifp->if_next) {
1571                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1572                         memcpy(eui, ifp->addr.s6_addr+8, 8);
1573                         err = 0;
1574                         break;
1575                 }
1576         }
1577         read_unlock_bh(&idev->lock);
1578         return err;
1579 }
1580 
1581 #ifdef CONFIG_IPV6_PRIVACY
1582 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1583 static int __ipv6_regen_rndid(struct inet6_dev *idev)
1584 {
1585 regen:
1586         get_random_bytes(idev->rndid, sizeof(idev->rndid));
1587         idev->rndid[0] &= ~0x02;
1588 
1589         /*
1590          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1591          * check if generated address is not inappropriate
1592          *
1593          *  - Reserved subnet anycast (RFC 2526)
1594          *      11111101 11....11 1xxxxxxx
1595          *  - ISATAP (RFC4214) 6.1
1596          *      00-00-5E-FE-xx-xx-xx-xx
1597          *  - value 0
1598          *  - XXX: already assigned to an address on the device
1599          */
1600         if (idev->rndid[0] == 0xfd &&
1601             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1602             (idev->rndid[7]&0x80))
1603                 goto regen;
1604         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1605                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1606                         goto regen;
1607                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1608                         goto regen;
1609         }
1610 
1611         return 0;
1612 }
1613 
1614 static void ipv6_regen_rndid(unsigned long data)
1615 {
1616         struct inet6_dev *idev = (struct inet6_dev *) data;
1617         unsigned long expires;
1618 
1619         rcu_read_lock_bh();
1620         write_lock_bh(&idev->lock);
1621 
1622         if (idev->dead)
1623                 goto out;
1624 
1625         if (__ipv6_regen_rndid(idev) < 0)
1626                 goto out;
1627 
1628         expires = jiffies +
1629                 idev->cnf.temp_prefered_lft * HZ -
1630                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time - desync_factor;
1631         if (time_before(expires, jiffies)) {
1632                 printk(KERN_WARNING
1633                         "ipv6_regen_rndid(): too short regeneration interval; timer disabled for %s.\n",
1634                         idev->dev->name);
1635                 goto out;
1636         }
1637 
1638         if (!mod_timer(&idev->regen_timer, expires))
1639                 in6_dev_hold(idev);
1640 
1641 out:
1642         write_unlock_bh(&idev->lock);
1643         rcu_read_unlock_bh();
1644         in6_dev_put(idev);
1645 }
1646 
1647 static int __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr) {
1648         int ret = 0;
1649 
1650         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1651                 ret = __ipv6_regen_rndid(idev);
1652         return ret;
1653 }
1654 #endif
1655 
1656 /*
1657  *      Add prefix route.
1658  */
1659 
1660 static void
1661 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1662                       unsigned long expires, u32 flags)
1663 {
1664         struct fib6_config cfg = {
1665                 .fc_table = RT6_TABLE_PREFIX,
1666                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1667                 .fc_ifindex = dev->ifindex,
1668                 .fc_expires = expires,
1669                 .fc_dst_len = plen,
1670                 .fc_flags = RTF_UP | flags,
1671                 .fc_nlinfo.nl_net = dev_net(dev),
1672                 .fc_protocol = RTPROT_KERNEL,
1673         };
1674 
1675         ipv6_addr_copy(&cfg.fc_dst, pfx);
1676 
1677         /* Prevent useless cloning on PtP SIT.
1678            This thing is done here expecting that the whole
1679            class of non-broadcast devices need not cloning.
1680          */
1681 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1682         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1683                 cfg.fc_flags |= RTF_NONEXTHOP;
1684 #endif
1685 
1686         ip6_route_add(&cfg);
1687 }
1688 
1689 /* Create "default" multicast route to the interface */
1690 
1691 static void addrconf_add_mroute(struct net_device *dev)
1692 {
1693         struct fib6_config cfg = {
1694                 .fc_table = RT6_TABLE_LOCAL,
1695                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1696                 .fc_ifindex = dev->ifindex,
1697                 .fc_dst_len = 8,
1698                 .fc_flags = RTF_UP,
1699                 .fc_nlinfo.nl_net = dev_net(dev),
1700         };
1701 
1702         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1703 
1704         ip6_route_add(&cfg);
1705 }
1706 
1707 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1708 static void sit_route_add(struct net_device *dev)
1709 {
1710         struct fib6_config cfg = {
1711                 .fc_table = RT6_TABLE_MAIN,
1712                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1713                 .fc_ifindex = dev->ifindex,
1714                 .fc_dst_len = 96,
1715                 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1716                 .fc_nlinfo.nl_net = dev_net(dev),
1717         };
1718 
1719         /* prefix length - 96 bits "::d.d.d.d" */
1720         ip6_route_add(&cfg);
1721 }
1722 #endif
1723 
1724 static void addrconf_add_lroute(struct net_device *dev)
1725 {
1726         struct in6_addr addr;
1727 
1728         ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
1729         addrconf_prefix_route(&addr, 64, dev, 0, 0);
1730 }
1731 
1732 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1733 {
1734         struct inet6_dev *idev;
1735 
1736         ASSERT_RTNL();
1737 
1738         if ((idev = ipv6_find_idev(dev)) == NULL)
1739                 return NULL;
1740 
1741         /* Add default multicast route */
1742         addrconf_add_mroute(dev);
1743 
1744         /* Add link local route */
1745         addrconf_add_lroute(dev);
1746         return idev;
1747 }
1748 
1749 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len)
1750 {
1751         struct prefix_info *pinfo;
1752         __u32 valid_lft;
1753         __u32 prefered_lft;
1754         int addr_type;
1755         struct inet6_dev *in6_dev;
1756         struct net *net = dev_net(dev);
1757 
1758         pinfo = (struct prefix_info *) opt;
1759 
1760         if (len < sizeof(struct prefix_info)) {
1761                 ADBG(("addrconf: prefix option too short\n"));
1762                 return;
1763         }
1764 
1765         /*
1766          *      Validation checks ([ADDRCONF], page 19)
1767          */
1768 
1769         addr_type = ipv6_addr_type(&pinfo->prefix);
1770 
1771         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1772                 return;
1773 
1774         valid_lft = ntohl(pinfo->valid);
1775         prefered_lft = ntohl(pinfo->prefered);
1776 
1777         if (prefered_lft > valid_lft) {
1778                 if (net_ratelimit())
1779                         printk(KERN_WARNING "addrconf: prefix option has invalid lifetime\n");
1780                 return;
1781         }
1782 
1783         in6_dev = in6_dev_get(dev);
1784 
1785         if (in6_dev == NULL) {
1786                 if (net_ratelimit())
1787                         printk(KERN_DEBUG "addrconf: device %s not configured\n", dev->name);
1788                 return;
1789         }
1790 
1791         /*
1792          *      Two things going on here:
1793          *      1) Add routes for on-link prefixes
1794          *      2) Configure prefixes with the auto flag set
1795          */
1796 
1797         if (pinfo->onlink) {
1798                 struct rt6_info *rt;
1799                 unsigned long rt_expires;
1800 
1801                 /* Avoid arithmetic overflow. Really, we could
1802                  * save rt_expires in seconds, likely valid_lft,
1803                  * but it would require division in fib gc, that it
1804                  * not good.
1805                  */
1806                 if (HZ > USER_HZ)
1807                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1808                 else
1809                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1810 
1811                 if (addrconf_finite_timeout(rt_expires))
1812                         rt_expires *= HZ;
1813 
1814                 rt = rt6_lookup(net, &pinfo->prefix, NULL,
1815                                 dev->ifindex, 1);
1816 
1817                 if (rt && addrconf_is_prefix_route(rt)) {
1818                         /* Autoconf prefix route */
1819                         if (valid_lft == 0) {
1820                                 ip6_del_rt(rt);
1821                                 rt = NULL;
1822                         } else if (addrconf_finite_timeout(rt_expires)) {
1823                                 /* not infinity */
1824                                 rt->rt6i_expires = jiffies + rt_expires;
1825                                 rt->rt6i_flags |= RTF_EXPIRES;
1826                         } else {
1827                                 rt->rt6i_flags &= ~RTF_EXPIRES;
1828                                 rt->rt6i_expires = 0;
1829                         }
1830                 } else if (valid_lft) {
1831                         clock_t expires = 0;
1832                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
1833                         if (addrconf_finite_timeout(rt_expires)) {
1834                                 /* not infinity */
1835                                 flags |= RTF_EXPIRES;
1836                                 expires = jiffies_to_clock_t(rt_expires);
1837                         }
1838                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
1839                                               dev, expires, flags);
1840                 }
1841                 if (rt)
1842                         dst_release(&rt->u.dst);
1843         }
1844 
1845         /* Try to figure out our local address for this prefix */
1846 
1847         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
1848                 struct inet6_ifaddr * ifp;
1849                 struct in6_addr addr;
1850                 int create = 0, update_lft = 0;
1851 
1852                 if (pinfo->prefix_len == 64) {
1853                         memcpy(&addr, &pinfo->prefix, 8);
1854                         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
1855                             ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
1856                                 in6_dev_put(in6_dev);
1857                                 return;
1858                         }
1859                         goto ok;
1860                 }
1861                 if (net_ratelimit())
1862                         printk(KERN_DEBUG "IPv6 addrconf: prefix with wrong length %d\n",
1863                                pinfo->prefix_len);
1864                 in6_dev_put(in6_dev);
1865                 return;
1866 
1867 ok:
1868 
1869                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
1870 
1871                 if (ifp == NULL && valid_lft) {
1872                         int max_addresses = in6_dev->cnf.max_addresses;
1873                         u32 addr_flags = 0;
1874 
1875 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1876                         if (in6_dev->cnf.optimistic_dad &&
1877                             !net->ipv6.devconf_all->forwarding)
1878                                 addr_flags = IFA_F_OPTIMISTIC;
1879 #endif
1880 
1881                         /* Do not allow to create too much of autoconfigured
1882                          * addresses; this would be too easy way to crash kernel.
1883                          */
1884                         if (!max_addresses ||
1885                             ipv6_count_addresses(in6_dev) < max_addresses)
1886                                 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
1887                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
1888                                                     addr_flags);
1889 
1890                         if (!ifp || IS_ERR(ifp)) {
1891                                 in6_dev_put(in6_dev);
1892                                 return;
1893                         }
1894 
1895                         update_lft = create = 1;
1896                         ifp->cstamp = jiffies;
1897                         addrconf_dad_start(ifp, RTF_ADDRCONF|RTF_PREFIX_RT);
1898                 }
1899 
1900                 if (ifp) {
1901                         int flags;
1902                         unsigned long now;
1903 #ifdef CONFIG_IPV6_PRIVACY
1904                         struct inet6_ifaddr *ift;
1905 #endif
1906                         u32 stored_lft;
1907 
1908                         /* update lifetime (RFC2462 5.5.3 e) */
1909                         spin_lock(&ifp->lock);
1910                         now = jiffies;
1911                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
1912                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
1913                         else
1914                                 stored_lft = 0;
1915                         if (!update_lft && stored_lft) {
1916                                 if (valid_lft > MIN_VALID_LIFETIME ||
1917                                     valid_lft > stored_lft)
1918                                         update_lft = 1;
1919                                 else if (stored_lft <= MIN_VALID_LIFETIME) {
1920                                         /* valid_lft <= stored_lft is always true */
1921                                         /*
1922                                          * RFC 4862 Section 5.5.3e:
1923                                          * "Note that the preferred lifetime of
1924                                          *  the corresponding address is always
1925                                          *  reset to the Preferred Lifetime in
1926                                          *  the received Prefix Information
1927                                          *  option, regardless of whether the
1928                                          *  valid lifetime is also reset or
1929                                          *  ignored."
1930                                          *
1931                                          *  So if the preferred lifetime in
1932                                          *  this advertisement is different
1933                                          *  than what we have stored, but the
1934                                          *  valid lifetime is invalid, just
1935                                          *  reset prefered_lft.
1936                                          *
1937                                          *  We must set the valid lifetime
1938                                          *  to the stored lifetime since we'll
1939                                          *  be updating the timestamp below,
1940                                          *  else we'll set it back to the
1941                                          *  minumum.
1942                                          */
1943                                         if (prefered_lft != ifp->prefered_lft) {
1944                                                 valid_lft = stored_lft;
1945                                                 update_lft = 1;
1946                                         }
1947                                 } else {
1948                                         valid_lft = MIN_VALID_LIFETIME;
1949                                         if (valid_lft < prefered_lft)
1950                                                 prefered_lft = valid_lft;
1951                                         update_lft = 1;
1952                                 }
1953                         }
1954 
1955                         if (update_lft) {
1956                                 ifp->valid_lft = valid_lft;
1957                                 ifp->prefered_lft = prefered_lft;
1958                                 ifp->tstamp = now;
1959                                 flags = ifp->flags;
1960                                 ifp->flags &= ~IFA_F_DEPRECATED;
1961                                 spin_unlock(&ifp->lock);
1962 
1963                                 if (!(flags&IFA_F_TENTATIVE))
1964                                         ipv6_ifa_notify(0, ifp);
1965                         } else
1966                                 spin_unlock(&ifp->lock);
1967 
1968 #ifdef CONFIG_IPV6_PRIVACY
1969                         read_lock_bh(&in6_dev->lock);
1970                         /* update all temporary addresses in the list */
1971                         for (ift=in6_dev->tempaddr_list; ift; ift=ift->tmp_next) {
1972                                 /*
1973                                  * When adjusting the lifetimes of an existing
1974                                  * temporary address, only lower the lifetimes.
1975                                  * Implementations must not increase the
1976                                  * lifetimes of an existing temporary address
1977                                  * when processing a Prefix Information Option.
1978                                  */
1979                                 if (ifp != ift->ifpub)
1980                                         continue;
1981 
1982                                 spin_lock(&ift->lock);
1983                                 flags = ift->flags;
1984                                 if (ift->valid_lft > valid_lft &&
1985                                     ift->valid_lft - valid_lft > (jiffies - ift->tstamp) / HZ)
1986                                         ift->valid_lft = valid_lft + (jiffies - ift->tstamp) / HZ;
1987                                 if (ift->prefered_lft > prefered_lft &&
1988                                     ift->prefered_lft - prefered_lft > (jiffies - ift->tstamp) / HZ)
1989                                         ift->prefered_lft = prefered_lft + (jiffies - ift->tstamp) / HZ;
1990                                 spin_unlock(&ift->lock);
1991                                 if (!(flags&IFA_F_TENTATIVE))
1992                                         ipv6_ifa_notify(0, ift);
1993                         }
1994 
1995                         if (create && in6_dev->cnf.use_tempaddr > 0) {
1996                                 /*
1997                                  * When a new public address is created as described in [ADDRCONF],
1998                                  * also create a new temporary address.
1999                                  */
2000                                 read_unlock_bh(&in6_dev->lock);
2001                                 ipv6_create_tempaddr(ifp, NULL);
2002                         } else {
2003                                 read_unlock_bh(&in6_dev->lock);
2004                         }
2005 #endif
2006                         in6_ifa_put(ifp);
2007                         addrconf_verify(0);
2008                 }
2009         }
2010         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2011         in6_dev_put(in6_dev);
2012 }
2013 
2014 /*
2015  *      Set destination address.
2016  *      Special case for SIT interfaces where we create a new "virtual"
2017  *      device.
2018  */
2019 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2020 {
2021         struct in6_ifreq ireq;
2022         struct net_device *dev;
2023         int err = -EINVAL;
2024 
2025         rtnl_lock();
2026 
2027         err = -EFAULT;
2028         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2029                 goto err_exit;
2030 
2031         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2032 
2033         err = -ENODEV;
2034         if (dev == NULL)
2035                 goto err_exit;
2036 
2037 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2038         if (dev->type == ARPHRD_SIT) {
2039                 const struct net_device_ops *ops = dev->netdev_ops;
2040                 struct ifreq ifr;
2041                 struct ip_tunnel_parm p;
2042 
2043                 err = -EADDRNOTAVAIL;
2044                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2045                         goto err_exit;
2046 
2047                 memset(&p, 0, sizeof(p));
2048                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2049                 p.iph.saddr = 0;
2050                 p.iph.version = 4;
2051                 p.iph.ihl = 5;
2052                 p.iph.protocol = IPPROTO_IPV6;
2053                 p.iph.ttl = 64;
2054                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2055 
2056                 if (ops->ndo_do_ioctl) {
2057                         mm_segment_t oldfs = get_fs();
2058 
2059                         set_fs(KERNEL_DS);
2060                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2061                         set_fs(oldfs);
2062                 } else
2063                         err = -EOPNOTSUPP;
2064 
2065                 if (err == 0) {
2066                         err = -ENOBUFS;
2067                         dev = __dev_get_by_name(net, p.name);
2068                         if (!dev)
2069                                 goto err_exit;
2070                         err = dev_open(dev);
2071                 }
2072         }
2073 #endif
2074 
2075 err_exit:
2076         rtnl_unlock();
2077         return err;
2078 }
2079 
2080 /*
2081  *      Manual configuration of address on an interface
2082  */
2083 static int inet6_addr_add(struct net *net, int ifindex, struct in6_addr *pfx,
2084                           unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2085                           __u32 valid_lft)
2086 {
2087         struct inet6_ifaddr *ifp;
2088         struct inet6_dev *idev;
2089         struct net_device *dev;
2090         int scope;
2091         u32 flags;
2092         clock_t expires;
2093         unsigned long timeout;
2094 
2095         ASSERT_RTNL();
2096 
2097         if (plen > 128)
2098                 return -EINVAL;
2099 
2100         /* check the lifetime */
2101         if (!valid_lft || prefered_lft > valid_lft)
2102                 return -EINVAL;
2103 
2104         dev = __dev_get_by_index(net, ifindex);
2105         if (!dev)
2106                 return -ENODEV;
2107 
2108         if ((idev = addrconf_add_dev(dev)) == NULL)
2109                 return -ENOBUFS;
2110 
2111         scope = ipv6_addr_scope(pfx);
2112 
2113         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2114         if (addrconf_finite_timeout(timeout)) {
2115                 expires = jiffies_to_clock_t(timeout * HZ);
2116                 valid_lft = timeout;
2117                 flags = RTF_EXPIRES;
2118         } else {
2119                 expires = 0;
2120                 flags = 0;
2121                 ifa_flags |= IFA_F_PERMANENT;
2122         }
2123 
2124         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2125         if (addrconf_finite_timeout(timeout)) {
2126                 if (timeout == 0)
2127                         ifa_flags |= IFA_F_DEPRECATED;
2128                 prefered_lft = timeout;
2129         }
2130 
2131         ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2132 
2133         if (!IS_ERR(ifp)) {
2134                 spin_lock_bh(&ifp->lock);
2135                 ifp->valid_lft = valid_lft;
2136                 ifp->prefered_lft = prefered_lft;
2137                 ifp->tstamp = jiffies;
2138                 spin_unlock_bh(&ifp->lock);
2139 
2140                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2141                                       expires, flags);
2142                 /*
2143                  * Note that section 3.1 of RFC 4429 indicates
2144                  * that the Optimistic flag should not be set for
2145                  * manually configured addresses
2146                  */
2147                 addrconf_dad_start(ifp, 0);
2148                 in6_ifa_put(ifp);
2149                 addrconf_verify(0);
2150                 return 0;
2151         }
2152 
2153         return PTR_ERR(ifp);
2154 }
2155 
2156 static int inet6_addr_del(struct net *net, int ifindex, struct in6_addr *pfx,
2157                           unsigned int plen)
2158 {
2159         struct inet6_ifaddr *ifp;
2160         struct inet6_dev *idev;
2161         struct net_device *dev;
2162 
2163         if (plen > 128)
2164                 return -EINVAL;
2165 
2166         dev = __dev_get_by_index(net, ifindex);
2167         if (!dev)
2168                 return -ENODEV;
2169 
2170         if ((idev = __in6_dev_get(dev)) == NULL)
2171                 return -ENXIO;
2172 
2173         read_lock_bh(&idev->lock);
2174         for (ifp = idev->addr_list; ifp; ifp=ifp->if_next) {
2175                 if (ifp->prefix_len == plen &&
2176                     ipv6_addr_equal(pfx, &ifp->addr)) {
2177                         in6_ifa_hold(ifp);
2178                         read_unlock_bh(&idev->lock);
2179 
2180                         ipv6_del_addr(ifp);
2181 
2182                         /* If the last address is deleted administratively,
2183                            disable IPv6 on this interface.
2184                          */
2185                         if (idev->addr_list == NULL)
2186                                 addrconf_ifdown(idev->dev, 1);
2187                         return 0;
2188                 }
2189         }
2190         read_unlock_bh(&idev->lock);
2191         return -EADDRNOTAVAIL;
2192 }
2193 
2194 
2195 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2196 {
2197         struct in6_ifreq ireq;
2198         int err;
2199 
2200         if (!capable(CAP_NET_ADMIN))
2201                 return -EPERM;
2202 
2203         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2204                 return -EFAULT;
2205 
2206         rtnl_lock();
2207         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2208                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2209                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2210         rtnl_unlock();
2211         return err;
2212 }
2213 
2214 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2215 {
2216         struct in6_ifreq ireq;
2217         int err;
2218 
2219         if (!capable(CAP_NET_ADMIN))
2220                 return -EPERM;
2221 
2222         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2223                 return -EFAULT;
2224 
2225         rtnl_lock();
2226         err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2227                              ireq.ifr6_prefixlen);
2228         rtnl_unlock();
2229         return err;
2230 }
2231 
2232 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2233                      int plen, int scope)
2234 {
2235         struct inet6_ifaddr *ifp;
2236 
2237         ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2238         if (!IS_ERR(ifp)) {
2239                 spin_lock_bh(&ifp->lock);
2240                 ifp->flags &= ~IFA_F_TENTATIVE;
2241                 spin_unlock_bh(&ifp->lock);
2242                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2243                 in6_ifa_put(ifp);
2244         }
2245 }
2246 
2247 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2248 static void sit_add_v4_addrs(struct inet6_dev *idev)
2249 {
2250         struct in6_addr addr;
2251         struct net_device *dev;
2252         struct net *net = dev_net(idev->dev);
2253         int scope;
2254 
2255         ASSERT_RTNL();
2256 
2257         memset(&addr, 0, sizeof(struct in6_addr));
2258         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2259 
2260         if (idev->dev->flags&IFF_POINTOPOINT) {
2261                 addr.s6_addr32[0] = htonl(0xfe800000);
2262                 scope = IFA_LINK;
2263         } else {
2264                 scope = IPV6_ADDR_COMPATv4;
2265         }
2266 
2267         if (addr.s6_addr32[3]) {
2268                 add_addr(idev, &addr, 128, scope);
2269                 return;
2270         }
2271 
2272         for_each_netdev(net, dev) {
2273                 struct in_device * in_dev = __in_dev_get_rtnl(dev);
2274                 if (in_dev && (dev->flags & IFF_UP)) {
2275                         struct in_ifaddr * ifa;
2276 
2277                         int flag = scope;
2278 
2279                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2280                                 int plen;
2281 
2282                                 addr.s6_addr32[3] = ifa->ifa_local;
2283 
2284                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2285                                         continue;
2286                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2287                                         if (idev->dev->flags&IFF_POINTOPOINT)
2288                                                 continue;
2289                                         flag |= IFA_HOST;
2290                                 }
2291                                 if (idev->dev->flags&IFF_POINTOPOINT)
2292                                         plen = 64;
2293                                 else
2294                                         plen = 96;
2295 
2296                                 add_addr(idev, &addr, plen, flag);
2297                         }
2298                 }
2299         }
2300 }
2301 #endif
2302 
2303 static void init_loopback(struct net_device *dev)
2304 {
2305         struct inet6_dev  *idev;
2306 
2307         /* ::1 */
2308 
2309         ASSERT_RTNL();
2310 
2311         if ((idev = ipv6_find_idev(dev)) == NULL) {
2312                 printk(KERN_DEBUG "init loopback: add_dev failed\n");
2313                 return;
2314         }
2315 
2316         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2317 }
2318 
2319 static void addrconf_add_linklocal(struct inet6_dev *idev, struct in6_addr *addr)
2320 {
2321         struct inet6_ifaddr * ifp;
2322         u32 addr_flags = IFA_F_PERMANENT;
2323 
2324 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2325         if (idev->cnf.optimistic_dad &&
2326             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2327                 addr_flags |= IFA_F_OPTIMISTIC;
2328 #endif
2329 
2330 
2331         ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2332         if (!IS_ERR(ifp)) {
2333                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2334                 addrconf_dad_start(ifp, 0);
2335                 in6_ifa_put(ifp);
2336         }
2337 }
2338 
2339 static void addrconf_dev_config(struct net_device *dev)
2340 {
2341         struct in6_addr addr;
2342         struct inet6_dev    * idev;
2343 
2344         ASSERT_RTNL();
2345 
2346         if ((dev->type != ARPHRD_ETHER) &&
2347             (dev->type != ARPHRD_FDDI) &&
2348             (dev->type != ARPHRD_IEEE802_TR) &&
2349             (dev->type != ARPHRD_ARCNET) &&
2350             (dev->type != ARPHRD_INFINIBAND)) {
2351                 /* Alas, we support only Ethernet autoconfiguration. */
2352                 return;
2353         }
2354 
2355         idev = addrconf_add_dev(dev);
2356         if (idev == NULL)
2357                 return;
2358 
2359         memset(&addr, 0, sizeof(struct in6_addr));
2360         addr.s6_addr32[0] = htonl(0xFE800000);
2361 
2362         if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2363                 addrconf_add_linklocal(idev, &addr);
2364 }
2365 
2366 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2367 static void addrconf_sit_config(struct net_device *dev)
2368 {
2369         struct inet6_dev *idev;
2370 
2371         ASSERT_RTNL();
2372 
2373         /*
2374          * Configure the tunnel with one of our IPv4
2375          * addresses... we should configure all of
2376          * our v4 addrs in the tunnel
2377          */
2378 
2379         if ((idev = ipv6_find_idev(dev)) == NULL) {
2380                 printk(KERN_DEBUG "init sit: add_dev failed\n");
2381                 return;
2382         }
2383 
2384         if (dev->priv_flags & IFF_ISATAP) {
2385                 struct in6_addr addr;
2386 
2387                 ipv6_addr_set(&addr,  htonl(0xFE800000), 0, 0, 0);
2388                 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2389                 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2390                         addrconf_add_linklocal(idev, &addr);
2391                 return;
2392         }
2393 
2394         sit_add_v4_addrs(idev);
2395 
2396         if (dev->flags&IFF_POINTOPOINT) {
2397                 addrconf_add_mroute(dev);
2398                 addrconf_add_lroute(dev);
2399         } else
2400                 sit_route_add(dev);
2401 }
2402 #endif
2403 
2404 static inline int
2405 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2406 {
2407         struct in6_addr lladdr;
2408 
2409         if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2410                 addrconf_add_linklocal(idev, &lladdr);
2411                 return 0;
2412         }
2413         return -1;
2414 }
2415 
2416 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2417 {
2418         struct net_device *link_dev;
2419         struct net *net = dev_net(idev->dev);
2420 
2421         /* first try to inherit the link-local address from the link device */
2422         if (idev->dev->iflink &&
2423             (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2424                 if (!ipv6_inherit_linklocal(idev, link_dev))
2425                         return;
2426         }
2427         /* then try to inherit it from any device */
2428         for_each_netdev(net, link_dev) {
2429                 if (!ipv6_inherit_linklocal(idev, link_dev))
2430                         return;
2431         }
2432         printk(KERN_DEBUG "init ip6-ip6: add_linklocal failed\n");
2433 }
2434 
2435 /*
2436  * Autoconfigure tunnel with a link-local address so routing protocols,
2437  * DHCPv6, MLD etc. can be run over the virtual link
2438  */
2439 
2440 static void addrconf_ip6_tnl_config(struct net_device *dev)
2441 {
2442         struct inet6_dev *idev;
2443 
2444         ASSERT_RTNL();
2445 
2446         if ((idev = addrconf_add_dev(dev)) == NULL) {
2447                 printk(KERN_DEBUG "init ip6-ip6: add_dev failed\n");
2448                 return;
2449         }
2450         ip6_tnl_add_linklocal(idev);
2451 }
2452 
2453 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2454                            void * data)
2455 {
2456         struct net_device *dev = (struct net_device *) data;
2457         struct inet6_dev *idev = __in6_dev_get(dev);
2458         int run_pending = 0;
2459         int err;
2460 
2461         switch(event) {
2462         case NETDEV_REGISTER:
2463                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2464                         idev = ipv6_add_dev(dev);
2465                         if (!idev)
2466                                 return notifier_from_errno(-ENOMEM);
2467                 }
2468                 break;
2469         case NETDEV_UP:
2470         case NETDEV_CHANGE:
2471                 if (dev->flags & IFF_SLAVE)
2472                         break;
2473 
2474                 if (event == NETDEV_UP) {
2475                         if (!addrconf_qdisc_ok(dev)) {
2476                                 /* device is not ready yet. */
2477                                 printk(KERN_INFO
2478                                         "ADDRCONF(NETDEV_UP): %s: "
2479                                         "link is not ready\n",
2480                                         dev->name);
2481                                 break;
2482                         }
2483 
2484                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
2485                                 idev = ipv6_add_dev(dev);
2486 
2487                         if (idev) {
2488                                 idev->if_flags |= IF_READY;
2489                                 run_pending = 1;
2490                         }
2491                 } else {
2492                         if (!addrconf_qdisc_ok(dev)) {
2493                                 /* device is still not ready. */
2494                                 break;
2495                         }
2496 
2497                         if (idev) {
2498                                 if (idev->if_flags & IF_READY) {
2499                                         /* device is already configured. */
2500                                         break;
2501                                 }
2502                                 idev->if_flags |= IF_READY;
2503                         }
2504 
2505                         printk(KERN_INFO
2506                                         "ADDRCONF(NETDEV_CHANGE): %s: "
2507                                         "link becomes ready\n",
2508                                         dev->name);
2509 
2510                         run_pending = 1;
2511                 }
2512 
2513                 switch(dev->type) {
2514 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2515                 case ARPHRD_SIT:
2516                         addrconf_sit_config(dev);
2517                         break;
2518 #endif
2519                 case ARPHRD_TUNNEL6:
2520                         addrconf_ip6_tnl_config(dev);
2521                         break;
2522                 case ARPHRD_LOOPBACK:
2523                         init_loopback(dev);
2524                         break;
2525 
2526                 default:
2527                         addrconf_dev_config(dev);
2528                         break;
2529                 }
2530                 if (idev) {
2531                         if (run_pending)
2532                                 addrconf_dad_run(idev);
2533 
2534                         /* If the MTU changed during the interface down, when the
2535                            interface up, the changed MTU must be reflected in the
2536                            idev as well as routers.
2537                          */
2538                         if (idev->cnf.mtu6 != dev->mtu && dev->mtu >= IPV6_MIN_MTU) {
2539                                 rt6_mtu_change(dev, dev->mtu);
2540                                 idev->cnf.mtu6 = dev->mtu;
2541                         }
2542                         idev->tstamp = jiffies;
2543                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
2544                         /* If the changed mtu during down is lower than IPV6_MIN_MTU
2545                            stop IPv6 on this interface.
2546                          */
2547                         if (dev->mtu < IPV6_MIN_MTU)
2548                                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2549                 }
2550                 break;
2551 
2552         case NETDEV_CHANGEMTU:
2553                 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2554                         rt6_mtu_change(dev, dev->mtu);
2555                         idev->cnf.mtu6 = dev->mtu;
2556                         break;
2557                 }
2558 
2559                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2560                         idev = ipv6_add_dev(dev);
2561                         if (idev)
2562                                 break;
2563                 }
2564 
2565                 /* MTU falled under IPV6_MIN_MTU. Stop IPv6 on this interface. */
2566 
2567         case NETDEV_DOWN:
2568         case NETDEV_UNREGISTER:
2569                 /*
2570                  *      Remove all addresses from this interface.
2571                  */
2572                 addrconf_ifdown(dev, event != NETDEV_DOWN);
2573                 break;
2574 
2575         case NETDEV_CHANGENAME:
2576                 if (idev) {
2577                         snmp6_unregister_dev(idev);
2578                         addrconf_sysctl_unregister(idev);
2579                         addrconf_sysctl_register(idev);
2580                         err = snmp6_register_dev(idev);
2581                         if (err)
2582                                 return notifier_from_errno(err);
2583                 }
2584                 break;
2585         case NETDEV_BONDING_OLDTYPE:
2586         case NETDEV_BONDING_NEWTYPE:
2587                 addrconf_bonding_change(dev, event);
2588                 break;
2589         }
2590 
2591         return NOTIFY_OK;
2592 }
2593 
2594 /*
2595  *      addrconf module should be notified of a device going up
2596  */
2597 static struct notifier_block ipv6_dev_notf = {
2598         .notifier_call = addrconf_notify,
2599         .priority = 0
2600 };
2601 
2602 static void addrconf_bonding_change(struct net_device *dev, unsigned long event)
2603 {
2604         struct inet6_dev *idev;
2605         ASSERT_RTNL();
2606 
2607         idev = __in6_dev_get(dev);
2608 
2609         if (event == NETDEV_BONDING_NEWTYPE)
2610                 ipv6_mc_remap(idev);
2611         else if (event == NETDEV_BONDING_OLDTYPE)
2612                 ipv6_mc_unmap(idev);
2613 }
2614 
2615 static int addrconf_ifdown(struct net_device *dev, int how)
2616 {
2617         struct inet6_dev *idev;
2618         struct inet6_ifaddr *ifa, **bifa;
2619         struct net *net = dev_net(dev);
2620         int i;
2621 
2622         ASSERT_RTNL();
2623 
2624         rt6_ifdown(net, dev);
2625         neigh_ifdown(&nd_tbl, dev);
2626 
2627         idev = __in6_dev_get(dev);
2628         if (idev == NULL)
2629                 return -ENODEV;
2630 
2631         /* Step 1: remove reference to ipv6 device from parent device.
2632                    Do not dev_put!
2633          */
2634         if (how) {
2635                 idev->dead = 1;
2636 
2637                 /* protected by rtnl_lock */
2638                 rcu_assign_pointer(dev->ip6_ptr, NULL);
2639 
2640                 /* Step 1.5: remove snmp6 entry */
2641                 snmp6_unregister_dev(idev);
2642 
2643         }
2644 
2645         /* Step 2: clear hash table */
2646         for (i=0; i<IN6_ADDR_HSIZE; i++) {
2647                 bifa = &inet6_addr_lst[i];
2648 
2649                 write_lock_bh(&addrconf_hash_lock);
2650                 while ((ifa = *bifa) != NULL) {
2651                         if (ifa->idev == idev) {
2652                                 *bifa = ifa->lst_next;
2653                                 ifa->lst_next = NULL;
2654                                 addrconf_del_timer(ifa);
2655                                 in6_ifa_put(ifa);
2656                                 continue;
2657                         }
2658                         bifa = &ifa->lst_next;
2659                 }
2660                 write_unlock_bh(&addrconf_hash_lock);
2661         }
2662 
2663         write_lock_bh(&idev->lock);
2664 
2665         /* Step 3: clear flags for stateless addrconf */
2666         if (!how)
2667                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2668 
2669         /* Step 4: clear address list */
2670 #ifdef CONFIG_IPV6_PRIVACY
2671         if (how && del_timer(&idev->regen_timer))
2672                 in6_dev_put(idev);
2673 
2674         /* clear tempaddr list */
2675         while ((ifa = idev->tempaddr_list) != NULL) {
2676                 idev->tempaddr_list = ifa->tmp_next;
2677                 ifa->tmp_next = NULL;
2678                 ifa->dead = 1;
2679                 write_unlock_bh(&idev->lock);
2680                 spin_lock_bh(&ifa->lock);
2681 
2682                 if (ifa->ifpub) {
2683                         in6_ifa_put(ifa->ifpub);
2684                         ifa->ifpub = NULL;
2685                 }
2686                 spin_unlock_bh(&ifa->lock);
2687                 in6_ifa_put(ifa);
2688                 write_lock_bh(&idev->lock);
2689         }
2690 #endif
2691         while ((ifa = idev->addr_list) != NULL) {
2692                 idev->addr_list = ifa->if_next;
2693                 ifa->if_next = NULL;
2694                 ifa->dead = 1;
2695                 addrconf_del_timer(ifa);
2696                 write_unlock_bh(&idev->lock);
2697 
2698                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2699                 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2700                 in6_ifa_put(ifa);
2701 
2702                 write_lock_bh(&idev->lock);
2703         }
2704         write_unlock_bh(&idev->lock);
2705 
2706         /* Step 5: Discard multicast list */
2707 
2708         if (how)
2709                 ipv6_mc_destroy_dev(idev);
2710         else
2711                 ipv6_mc_down(idev);
2712 
2713         idev->tstamp = jiffies;
2714 
2715         /* Shot the device (if unregistered) */
2716 
2717         if (how) {
2718                 addrconf_sysctl_unregister(idev);
2719                 neigh_parms_release(&nd_tbl, idev->nd_parms);
2720                 neigh_ifdown(&nd_tbl, dev);
2721                 in6_dev_put(idev);
2722         }
2723         return 0;
2724 }
2725 
2726 static void addrconf_rs_timer(unsigned long data)
2727 {
2728         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2729 
2730         if (ifp->idev->cnf.forwarding)
2731                 goto out;
2732 
2733         if (ifp->idev->if_flags & IF_RA_RCVD) {
2734                 /*
2735                  *      Announcement received after solicitation
2736                  *      was sent
2737                  */
2738                 goto out;
2739         }
2740 
2741         spin_lock(&ifp->lock);
2742         if (ifp->probes++ < ifp->idev->cnf.rtr_solicits) {
2743                 /* The wait after the last probe can be shorter */
2744                 addrconf_mod_timer(ifp, AC_RS,
2745                                    (ifp->probes == ifp->idev->cnf.rtr_solicits) ?
2746                                    ifp->idev->cnf.rtr_solicit_delay :
2747                                    ifp->idev->cnf.rtr_solicit_interval);
2748                 spin_unlock(&ifp->lock);
2749 
2750                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2751         } else {
2752                 spin_unlock(&ifp->lock);
2753                 /*
2754                  * Note: we do not support deprecated "all on-link"
2755                  * assumption any longer.
2756                  */
2757                 printk(KERN_DEBUG "%s: no IPv6 routers present\n",
2758                        ifp->idev->dev->name);
2759         }
2760 
2761 out:
2762         in6_ifa_put(ifp);
2763 }
2764 
2765 /*
2766  *      Duplicate Address Detection
2767  */
2768 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
2769 {
2770         unsigned long rand_num;
2771         struct inet6_dev *idev = ifp->idev;
2772 
2773         if (ifp->flags & IFA_F_OPTIMISTIC)
2774                 rand_num = 0;
2775         else
2776                 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
2777 
2778         ifp->probes = idev->cnf.dad_transmits;
2779         addrconf_mod_timer(ifp, AC_DAD, rand_num);
2780 }
2781 
2782 static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
2783 {
2784         struct inet6_dev *idev = ifp->idev;
2785         struct net_device *dev = idev->dev;
2786 
2787         addrconf_join_solict(dev, &ifp->addr);
2788 
2789         net_srandom(ifp->addr.s6_addr32[3]);
2790 
2791         read_lock_bh(&idev->lock);
2792         if (ifp->dead)
2793                 goto out;
2794         spin_lock_bh(&ifp->lock);
2795 
2796         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
2797             idev->cnf.accept_dad < 1 ||
2798             !(ifp->flags&IFA_F_TENTATIVE) ||
2799             ifp->flags & IFA_F_NODAD) {
2800                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2801                 spin_unlock_bh(&ifp->lock);
2802                 read_unlock_bh(&idev->lock);
2803 
2804                 addrconf_dad_completed(ifp);
2805                 return;
2806         }
2807 
2808         if (!(idev->if_flags & IF_READY)) {
2809                 spin_unlock_bh(&ifp->lock);
2810                 read_unlock_bh(&idev->lock);
2811                 /*
2812                  * If the device is not ready:
2813                  * - keep it tentative if it is a permanent address.
2814                  * - otherwise, kill it.
2815                  */
2816                 in6_ifa_hold(ifp);
2817                 addrconf_dad_stop(ifp, 0);
2818                 return;
2819         }
2820 
2821         /*
2822          * Optimistic nodes can start receiving
2823          * Frames right away
2824          */
2825         if(ifp->flags & IFA_F_OPTIMISTIC)
2826                 ip6_ins_rt(ifp->rt);
2827 
2828         addrconf_dad_kick(ifp);
2829         spin_unlock_bh(&ifp->lock);
2830 out:
2831         read_unlock_bh(&idev->lock);
2832 }
2833 
2834 static void addrconf_dad_timer(unsigned long data)
2835 {
2836         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2837         struct inet6_dev *idev = ifp->idev;
2838         struct in6_addr mcaddr;
2839 
2840         read_lock_bh(&idev->lock);
2841         if (idev->dead) {
2842                 read_unlock_bh(&idev->lock);
2843                 goto out;
2844         }
2845         spin_lock_bh(&ifp->lock);
2846         if (ifp->probes == 0) {
2847                 /*
2848                  * DAD was successful
2849                  */
2850 
2851                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
2852                 spin_unlock_bh(&ifp->lock);
2853                 read_unlock_bh(&idev->lock);
2854 
2855                 addrconf_dad_completed(ifp);
2856 
2857                 goto out;
2858         }
2859 
2860         ifp->probes--;
2861         addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
2862         spin_unlock_bh(&ifp->lock);
2863         read_unlock_bh(&idev->lock);
2864 
2865         /* send a neighbour solicitation for our addr */
2866         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
2867         ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
2868 out:
2869         in6_ifa_put(ifp);
2870 }
2871 
2872 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
2873 {
2874         struct net_device *     dev = ifp->idev->dev;
2875 
2876         /*
2877          *      Configure the address for reception. Now it is valid.
2878          */
2879 
2880         ipv6_ifa_notify(RTM_NEWADDR, ifp);
2881 
2882         /* If added prefix is link local and forwarding is off,
2883            start sending router solicitations.
2884          */
2885 
2886         if (ifp->idev->cnf.forwarding == 0 &&
2887             ifp->idev->cnf.rtr_solicits > 0 &&
2888             (dev->flags&IFF_LOOPBACK) == 0 &&
2889             (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
2890                 /*
2891                  *      If a host as already performed a random delay
2892                  *      [...] as part of DAD [...] there is no need
2893                  *      to delay again before sending the first RS
2894                  */
2895                 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
2896 
2897                 spin_lock_bh(&ifp->lock);
2898                 ifp->probes = 1;
2899                 ifp->idev->if_flags |= IF_RS_SENT;
2900                 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
2901                 spin_unlock_bh(&ifp->lock);
2902         }
2903 }
2904 
2905 static void addrconf_dad_run(struct inet6_dev *idev) {
2906         struct inet6_ifaddr *ifp;
2907 
2908         read_lock_bh(&idev->lock);
2909         for (ifp = idev->addr_list; ifp; ifp = ifp->if_next) {
2910                 spin_lock_bh(&ifp->lock);
2911                 if (!(ifp->flags & IFA_F_TENTATIVE)) {
2912                         spin_unlock_bh(&ifp->lock);
2913                         continue;
2914                 }
2915                 spin_unlock_bh(&ifp->lock);
2916                 addrconf_dad_kick(ifp);
2917         }
2918         read_unlock_bh(&idev->lock);
2919 }
2920 
2921 #ifdef CONFIG_PROC_FS
2922 struct if6_iter_state {
2923         struct seq_net_private p;
2924         int bucket;
2925 };
2926 
2927 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq)
2928 {
2929         struct inet6_ifaddr *ifa = NULL;
2930         struct if6_iter_state *state = seq->private;
2931         struct net *net = seq_file_net(seq);
2932 
2933         for (state->bucket = 0; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
2934                 ifa = inet6_addr_lst[state->bucket];
2935 
2936                 while (ifa && !net_eq(dev_net(ifa->idev->dev), net))
2937                         ifa = ifa->lst_next;
2938                 if (ifa)
2939                         break;
2940         }
2941         return ifa;
2942 }
2943 
2944 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq, struct inet6_ifaddr *ifa)
2945 {
2946         struct if6_iter_state *state = seq->private;
2947         struct net *net = seq_file_net(seq);
2948 
2949         ifa = ifa->lst_next;
2950 try_again:
2951         if (ifa) {
2952                 if (!net_eq(dev_net(ifa->idev->dev), net)) {
2953                         ifa = ifa->lst_next;
2954                         goto try_again;
2955                 }
2956         }
2957 
2958         if (!ifa && ++state->bucket < IN6_ADDR_HSIZE) {
2959                 ifa = inet6_addr_lst[state->bucket];
2960                 goto try_again;
2961         }
2962 
2963         return ifa;
2964 }
2965 
2966 static struct inet6_ifaddr *if6_get_idx(struct seq_file *seq, loff_t pos)
2967 {
2968         struct inet6_ifaddr *ifa = if6_get_first(seq);
2969 
2970         if (ifa)
2971                 while(pos && (ifa = if6_get_next(seq, ifa)) != NULL)
2972                         --pos;
2973         return pos ? NULL : ifa;
2974 }
2975 
2976 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
2977         __acquires(addrconf_hash_lock)
2978 {
2979         read_lock_bh(&addrconf_hash_lock);
2980         return if6_get_idx(seq, *pos);
2981 }
2982 
2983 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2984 {
2985         struct inet6_ifaddr *ifa;
2986 
2987         ifa = if6_get_next(seq, v);
2988         ++*pos;
2989         return ifa;
2990 }
2991 
2992 static void if6_seq_stop(struct seq_file *seq, void *v)
2993         __releases(addrconf_hash_lock)
2994 {
2995         read_unlock_bh(&addrconf_hash_lock);
2996 }
2997 
2998 static int if6_seq_show(struct seq_file *seq, void *v)
2999 {
3000         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3001         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3002                    &ifp->addr,
3003                    ifp->idev->dev->ifindex,
3004                    ifp->prefix_len,
3005                    ifp->scope,
3006                    ifp->flags,
3007                    ifp->idev->dev->name);
3008         return 0;
3009 }
3010 
3011 static const struct seq_operations if6_seq_ops = {
3012         .start  = if6_seq_start,
3013         .next   = if6_seq_next,
3014         .show   = if6_seq_show,
3015         .stop   = if6_seq_stop,
3016 };
3017 
3018 static int if6_seq_open(struct inode *inode, struct file *file)
3019 {
3020         return seq_open_net(inode, file, &if6_seq_ops,
3021                             sizeof(struct if6_iter_state));
3022 }
3023 
3024 static const struct file_operations if6_fops = {
3025         .owner          = THIS_MODULE,
3026         .open           = if6_seq_open,
3027         .read           = seq_read,
3028         .llseek         = seq_lseek,
3029         .release        = seq_release_net,
3030 };
3031 
3032 static int if6_proc_net_init(struct net *net)
3033 {
3034         if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3035                 return -ENOMEM;
3036         return 0;
3037 }
3038 
3039 static void if6_proc_net_exit(struct net *net)
3040 {
3041        proc_net_remove(net, "if_inet6");
3042 }
3043 
3044 static struct pernet_operations if6_proc_net_ops = {
3045        .init = if6_proc_net_init,
3046        .exit = if6_proc_net_exit,
3047 };
3048 
3049 int __init if6_proc_init(void)
3050 {
3051         return register_pernet_subsys(&if6_proc_net_ops);
3052 }
3053 
3054 void if6_proc_exit(void)
3055 {
3056         unregister_pernet_subsys(&if6_proc_net_ops);
3057 }
3058 #endif  /* CONFIG_PROC_FS */
3059 
3060 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3061 /* Check if address is a home address configured on any interface. */
3062 int ipv6_chk_home_addr(struct net *net, struct in6_addr *addr)
3063 {
3064         int ret = 0;
3065         struct inet6_ifaddr * ifp;
3066         u8 hash = ipv6_addr_hash(addr);
3067         read_lock_bh(&addrconf_hash_lock);
3068         for (ifp = inet6_addr_lst[hash]; ifp; ifp = ifp->lst_next) {
3069                 if (!net_eq(dev_net(ifp->idev->dev), net))
3070                         continue;
3071                 if (ipv6_addr_equal(&ifp->addr, addr) &&
3072                     (ifp->flags & IFA_F_HOMEADDRESS)) {
3073                         ret = 1;
3074                         break;
3075                 }
3076         }
3077         read_unlock_bh(&addrconf_hash_lock);
3078         return ret;
3079 }
3080 #endif
3081 
3082 /*
3083  *      Periodic address status verification
3084  */
3085 
3086 static void addrconf_verify(unsigned long foo)
3087 {
3088         struct inet6_ifaddr *ifp;
3089         unsigned long now, next;
3090         int i;
3091 
3092         spin_lock_bh(&addrconf_verify_lock);
3093         now = jiffies;
3094         next = now + ADDR_CHECK_FREQUENCY;
3095 
3096         del_timer(&addr_chk_timer);
3097 
3098         for (i=0; i < IN6_ADDR_HSIZE; i++) {
3099 
3100 restart:
3101                 read_lock(&addrconf_hash_lock);
3102                 for (ifp=inet6_addr_lst[i]; ifp; ifp=ifp->lst_next) {
3103                         unsigned long age;
3104 #ifdef CONFIG_IPV6_PRIVACY
3105                         unsigned long regen_advance;
3106 #endif
3107 
3108                         if (ifp->flags & IFA_F_PERMANENT)
3109                                 continue;
3110 
3111                         spin_lock(&ifp->lock);
3112                         age = (now - ifp->tstamp) / HZ;
3113 
3114 #ifdef CONFIG_IPV6_PRIVACY
3115                         regen_advance = ifp->idev->cnf.regen_max_retry *
3116                                         ifp->idev->cnf.dad_transmits *
3117                                         ifp->idev->nd_parms->retrans_time / HZ;
3118 #endif
3119 
3120                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3121                             age >= ifp->valid_lft) {
3122                                 spin_unlock(&ifp->lock);
3123                                 in6_ifa_hold(ifp);
3124                                 read_unlock(&addrconf_hash_lock);
3125                                 ipv6_del_addr(ifp);
3126                                 goto restart;
3127                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3128                                 spin_unlock(&ifp->lock);
3129                                 continue;
3130                         } else if (age >= ifp->prefered_lft) {
3131                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3132                                 int deprecate = 0;
3133 
3134                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3135                                         deprecate = 1;
3136                                         ifp->flags |= IFA_F_DEPRECATED;
3137                                 }
3138 
3139                                 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3140                                         next = ifp->tstamp + ifp->valid_lft * HZ;
3141 
3142                                 spin_unlock(&ifp->lock);
3143 
3144                                 if (deprecate) {
3145                                         in6_ifa_hold(ifp);
3146                                         read_unlock(&addrconf_hash_lock);
3147 
3148                                         ipv6_ifa_notify(0, ifp);
3149                                         in6_ifa_put(ifp);
3150                                         goto restart;
3151                                 }
3152 #ifdef CONFIG_IPV6_PRIVACY
3153                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3154                                    !(ifp->flags&IFA_F_TENTATIVE)) {
3155                                 if (age >= ifp->prefered_lft - regen_advance) {
3156                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
3157                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3158                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
3159                                         if (!ifp->regen_count && ifpub) {
3160                                                 ifp->regen_count++;
3161                                                 in6_ifa_hold(ifp);
3162                                                 in6_ifa_hold(ifpub);
3163                                                 spin_unlock(&ifp->lock);
3164                                                 read_unlock(&addrconf_hash_lock);
3165                                                 spin_lock(&ifpub->lock);
3166                                                 ifpub->regen_count = 0;
3167                                                 spin_unlock(&ifpub->lock);
3168                                                 ipv6_create_tempaddr(ifpub, ifp);
3169                                                 in6_ifa_put(ifpub);
3170                                                 in6_ifa_put(ifp);
3171                                                 goto restart;
3172                                         }
3173                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3174                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3175                                 spin_unlock(&ifp->lock);
3176 #endif
3177                         } else {
3178                                 /* ifp->prefered_lft <= ifp->valid_lft */
3179                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3180                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
3181                                 spin_unlock(&ifp->lock);
3182                         }
3183                 }
3184                 read_unlock(&addrconf_hash_lock);
3185         }
3186 
3187         addr_chk_timer.expires = time_before(next, jiffies + HZ) ? jiffies + HZ : next;
3188         add_timer(&addr_chk_timer);
3189         spin_unlock_bh(&addrconf_verify_lock);
3190 }
3191 
3192 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3193 {
3194         struct in6_addr *pfx = NULL;
3195 
3196         if (addr)
3197                 pfx = nla_data(addr);
3198 
3199         if (local) {
3200                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3201                         pfx = NULL;
3202                 else
3203                         pfx = nla_data(local);
3204         }
3205 
3206         return pfx;
3207 }
3208 
3209 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3210         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
3211         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
3212         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
3213 };
3214 
3215 static int
3216 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3217 {
3218         struct net *net = sock_net(skb->sk);
3219         struct ifaddrmsg *ifm;
3220         struct nlattr *tb[IFA_MAX+1];
3221         struct in6_addr *pfx;
3222         int err;
3223 
3224         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3225         if (err < 0)
3226                 return err;
3227 
3228         ifm = nlmsg_data(nlh);
3229         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3230         if (pfx == NULL)
3231                 return -EINVAL;
3232 
3233         return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3234 }
3235 
3236 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3237                              u32 prefered_lft, u32 valid_lft)
3238 {
3239         u32 flags;
3240         clock_t expires;
3241         unsigned long timeout;
3242 
3243         if (!valid_lft || (prefered_lft > valid_lft))
3244                 return -EINVAL;
3245 
3246         timeout = addrconf_timeout_fixup(valid_lft, HZ);
3247         if (addrconf_finite_timeout(timeout)) {
3248                 expires = jiffies_to_clock_t(timeout * HZ);
3249                 valid_lft = timeout;
3250                 flags = RTF_EXPIRES;
3251         } else {
3252                 expires = 0;
3253                 flags = 0;
3254                 ifa_flags |= IFA_F_PERMANENT;
3255         }
3256 
3257         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3258         if (addrconf_finite_timeout(timeout)) {
3259                 if (timeout == 0)
3260                         ifa_flags |= IFA_F_DEPRECATED;
3261                 prefered_lft = timeout;
3262         }
3263 
3264         spin_lock_bh(&ifp->lock);
3265         ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3266         ifp->tstamp = jiffies;
3267         ifp->valid_lft = valid_lft;
3268         ifp->prefered_lft = prefered_lft;
3269 
3270         spin_unlock_bh(&ifp->lock);
3271         if (!(ifp->flags&IFA_F_TENTATIVE))
3272                 ipv6_ifa_notify(0, ifp);
3273 
3274         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3275                               expires, flags);
3276         addrconf_verify(0);
3277 
3278         return 0;
3279 }
3280 
3281 static int
3282 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3283 {
3284         struct net *net = sock_net(skb->sk);
3285         struct ifaddrmsg *ifm;
3286         struct nlattr *tb[IFA_MAX+1];
3287         struct in6_addr *pfx;
3288         struct inet6_ifaddr *ifa;
3289         struct net_device *dev;
3290         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3291         u8 ifa_flags;
3292         int err;
3293 
3294         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3295         if (err < 0)
3296                 return err;
3297 
3298         ifm = nlmsg_data(nlh);
3299         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3300         if (pfx == NULL)
3301                 return -EINVAL;
3302 
3303         if (tb[IFA_CACHEINFO]) {
3304                 struct ifa_cacheinfo *ci;
3305 
3306                 ci = nla_data(tb[IFA_CACHEINFO]);
3307                 valid_lft = ci->ifa_valid;
3308                 preferred_lft = ci->ifa_prefered;
3309         } else {
3310                 preferred_lft = INFINITY_LIFE_TIME;
3311                 valid_lft = INFINITY_LIFE_TIME;
3312         }
3313 
3314         dev =  __dev_get_by_index(net, ifm->ifa_index);
3315         if (dev == NULL)
3316                 return -ENODEV;
3317 
3318         /* We ignore other flags so far. */
3319         ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3320 
3321         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3322         if (ifa == NULL) {
3323                 /*
3324                  * It would be best to check for !NLM_F_CREATE here but
3325                  * userspace alreay relies on not having to provide this.
3326                  */
3327                 return inet6_addr_add(net, ifm->ifa_index, pfx,
3328                                       ifm->ifa_prefixlen, ifa_flags,
3329                                       preferred_lft, valid_lft);
3330         }
3331 
3332         if (nlh->nlmsg_flags & NLM_F_EXCL ||
3333             !(nlh->nlmsg_flags & NLM_F_REPLACE))
3334                 err = -EEXIST;
3335         else
3336                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3337 
3338         in6_ifa_put(ifa);
3339 
3340         return err;
3341 }
3342 
3343 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3344                           u8 scope, int ifindex)
3345 {
3346         struct ifaddrmsg *ifm;
3347 
3348         ifm = nlmsg_data(nlh);
3349         ifm->ifa_family = AF_INET6;
3350         ifm->ifa_prefixlen = prefixlen;
3351         ifm->ifa_flags = flags;
3352         ifm->ifa_scope = scope;
3353         ifm->ifa_index = ifindex;
3354 }
3355 
3356 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3357                          unsigned long tstamp, u32 preferred, u32 valid)
3358 {
3359         struct ifa_cacheinfo ci;
3360 
3361         ci.cstamp = (u32)(TIME_DELTA(cstamp, INITIAL_JIFFIES) / HZ * 100
3362                         + TIME_DELTA(cstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3363         ci.tstamp = (u32)(TIME_DELTA(tstamp, INITIAL_JIFFIES) / HZ * 100
3364                         + TIME_DELTA(tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3365         ci.ifa_prefered = preferred;
3366         ci.ifa_valid = valid;
3367 
3368         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3369 }
3370 
3371 static inline int rt_scope(int ifa_scope)
3372 {
3373         if (ifa_scope & IFA_HOST)
3374                 return RT_SCOPE_HOST;
3375         else if (ifa_scope & IFA_LINK)
3376                 return RT_SCOPE_LINK;
3377         else if (ifa_scope & IFA_SITE)
3378                 return RT_SCOPE_SITE;
3379         else
3380                 return RT_SCOPE_UNIVERSE;
3381 }
3382 
3383 static inline int inet6_ifaddr_msgsize(void)
3384 {
3385         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3386                + nla_total_size(16) /* IFA_ADDRESS */
3387                + nla_total_size(sizeof(struct ifa_cacheinfo));
3388 }
3389 
3390 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3391                              u32 pid, u32 seq, int event, unsigned int flags)
3392 {
3393         struct nlmsghdr  *nlh;
3394         u32 preferred, valid;
3395 
3396         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3397         if (nlh == NULL)
3398                 return -EMSGSIZE;
3399 
3400         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3401                       ifa->idev->dev->ifindex);
3402 
3403         if (!(ifa->flags&IFA_F_PERMANENT)) {
3404                 preferred = ifa->prefered_lft;
3405                 valid = ifa->valid_lft;
3406                 if (preferred != INFINITY_LIFE_TIME) {
3407                         long tval = (jiffies - ifa->tstamp)/HZ;
3408                         if (preferred > tval)
3409                                 preferred -= tval;
3410                         else
3411                                 preferred = 0;
3412                         if (valid != INFINITY_LIFE_TIME)
3413                                 valid -= tval;
3414                 }
3415         } else {
3416                 preferred = INFINITY_LIFE_TIME;
3417                 valid = INFINITY_LIFE_TIME;
3418         }
3419 
3420         if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3421             put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3422                 nlmsg_cancel(skb, nlh);
3423                 return -EMSGSIZE;
3424         }
3425 
3426         return nlmsg_end(skb, nlh);
3427 }
3428 
3429 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3430                                 u32 pid, u32 seq, int event, u16 flags)
3431 {
3432         struct nlmsghdr  *nlh;
3433         u8 scope = RT_SCOPE_UNIVERSE;
3434         int ifindex = ifmca->idev->dev->ifindex;
3435 
3436         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3437                 scope = RT_SCOPE_SITE;
3438 
3439         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3440         if (nlh == NULL)
3441                 return -EMSGSIZE;
3442 
3443         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3444         if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3445             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3446                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3447                 nlmsg_cancel(skb, nlh);
3448                 return -EMSGSIZE;
3449         }
3450 
3451         return nlmsg_end(skb, nlh);
3452 }
3453 
3454 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3455                                 u32 pid, u32 seq, int event, unsigned int flags)
3456 {
3457         struct nlmsghdr  *nlh;
3458         u8 scope = RT_SCOPE_UNIVERSE;
3459         int ifindex = ifaca->aca_idev->dev->ifindex;
3460 
3461         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3462                 scope = RT_SCOPE_SITE;
3463 
3464         nlh = nlmsg_put(skb, pid, seq, event, sizeof(struct ifaddrmsg), flags);
3465         if (nlh == NULL)
3466                 return -EMSGSIZE;
3467 
3468         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3469         if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3470             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3471                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3472                 nlmsg_cancel(skb, nlh);
3473                 return -EMSGSIZE;
3474         }
3475 
3476         return nlmsg_end(skb, nlh);
3477 }
3478 
3479 enum addr_type_t
3480 {
3481         UNICAST_ADDR,
3482         MULTICAST_ADDR,
3483         ANYCAST_ADDR,
3484 };
3485 
3486 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3487                            enum addr_type_t type)
3488 {
3489         int idx, ip_idx;
3490         int s_idx, s_ip_idx;
3491         int err = 1;
3492         struct net_device *dev;
3493         struct inet6_dev *idev = NULL;
3494         struct inet6_ifaddr *ifa;
3495         struct ifmcaddr6 *ifmca;
3496         struct ifacaddr6 *ifaca;
3497         struct net *net = sock_net(skb->sk);
3498 
3499         s_idx = cb->args[0];
3500         s_ip_idx = ip_idx = cb->args[1];
3501 
3502         idx = 0;
3503         for_each_netdev(net, dev) {
3504                 if (idx < s_idx)
3505                         goto cont;
3506                 if (idx > s_idx)
3507                         s_ip_idx = 0;
3508                 ip_idx = 0;
3509                 if ((idev = in6_dev_get(dev)) == NULL)
3510                         goto cont;
3511                 read_lock_bh(&idev->lock);
3512                 switch (type) {
3513                 case UNICAST_ADDR:
3514                         /* unicast address incl. temp addr */
3515                         for (ifa = idev->addr_list; ifa;
3516                              ifa = ifa->if_next, ip_idx++) {
3517                                 if (ip_idx < s_ip_idx)
3518                                         continue;
3519                                 err = inet6_fill_ifaddr(skb, ifa,
3520                                                         NETLINK_CB(cb->skb).pid,
3521                                                         cb->nlh->nlmsg_seq,
3522                                                         RTM_NEWADDR,
3523                                                         NLM_F_MULTI);
3524                         }
3525                         break;
3526                 case MULTICAST_ADDR:
3527                         /* multicast address */
3528                         for (ifmca = idev->mc_list; ifmca;
3529                              ifmca = ifmca->next, ip_idx++) {
3530                                 if (ip_idx < s_ip_idx)
3531                                         continue;
3532                                 err = inet6_fill_ifmcaddr(skb, ifmca,
3533                                                           NETLINK_CB(cb->skb).pid,
3534                                                           cb->nlh->nlmsg_seq,
3535                                                           RTM_GETMULTICAST,
3536                                                           NLM_F_MULTI);
3537                         }
3538                         break;
3539                 case ANYCAST_ADDR:
3540                         /* anycast address */
3541                         for (ifaca = idev->ac_list; ifaca;
3542                              ifaca = ifaca->aca_next, ip_idx++) {
3543                                 if (ip_idx < s_ip_idx)
3544                                         continue;
3545                                 err = inet6_fill_ifacaddr(skb, ifaca,
3546                                                           NETLINK_CB(cb->skb).pid,
3547                                                           cb->nlh->nlmsg_seq,
3548                                                           RTM_GETANYCAST,
3549                                                           NLM_F_MULTI);
3550                         }
3551                         break;
3552                 default:
3553                         break;
3554                 }
3555                 read_unlock_bh(&idev->lock);
3556                 in6_dev_put(idev);
3557 
3558                 if (err <= 0)
3559                         break;
3560 cont:
3561                 idx++;
3562         }
3563         cb->args[0] = idx;
3564         cb->args[1] = ip_idx;
3565         return skb->len;
3566 }
3567 
3568 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3569 {
3570         enum addr_type_t type = UNICAST_ADDR;
3571 
3572         return inet6_dump_addr(skb, cb, type);
3573 }
3574 
3575 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3576 {
3577         enum addr_type_t type = MULTICAST_ADDR;
3578 
3579         return inet6_dump_addr(skb, cb, type);
3580 }
3581 
3582 
3583 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3584 {
3585         enum addr_type_t type = ANYCAST_ADDR;
3586 
3587         return inet6_dump_addr(skb, cb, type);
3588 }
3589 
3590 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr* nlh,
3591                              void *arg)
3592 {
3593         struct net *net = sock_net(in_skb->sk);
3594         struct ifaddrmsg *ifm;
3595         struct nlattr *tb[IFA_MAX+1];
3596         struct in6_addr *addr = NULL;
3597         struct net_device *dev = NULL;
3598         struct inet6_ifaddr *ifa;
3599         struct sk_buff *skb;
3600         int err;
3601 
3602         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3603         if (err < 0)
3604                 goto errout;
3605 
3606         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3607         if (addr == NULL) {
3608                 err = -EINVAL;
3609                 goto errout;
3610         }
3611 
3612         ifm = nlmsg_data(nlh);
3613         if (ifm->ifa_index)
3614                 dev = __dev_get_by_index(net, ifm->ifa_index);
3615 
3616         if ((ifa = ipv6_get_ifaddr(net, addr, dev, 1)) == NULL) {
3617                 err = -EADDRNOTAVAIL;
3618                 goto errout;
3619         }
3620 
3621         if ((skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL)) == NULL) {
3622                 err = -ENOBUFS;
3623                 goto errout_ifa;
3624         }
3625 
3626         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).pid,
3627                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3628         if (err < 0) {
3629                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3630                 WARN_ON(err == -EMSGSIZE);
3631                 kfree_skb(skb);
3632                 goto errout_ifa;
3633         }
3634         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).pid);
3635 errout_ifa:
3636         in6_ifa_put(ifa);
3637 errout:
3638         return err;
3639 }
3640 
3641 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3642 {
3643         struct sk_buff *skb;
3644         struct net *net = dev_net(ifa->idev->dev);
3645         int err = -ENOBUFS;
3646 
3647         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3648         if (skb == NULL)
3649                 goto errout;
3650 
3651         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3652         if (err < 0) {
3653                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3654                 WARN_ON(err == -EMSGSIZE);
3655                 kfree_skb(skb);
3656                 goto errout;
3657         }
3658         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3659         return;
3660 errout:
3661         if (err < 0)
3662                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3663 }
3664 
3665 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3666                                 __s32 *array, int bytes)
3667 {
3668         BUG_ON(bytes < (DEVCONF_MAX * 4));
3669 
3670         memset(array, 0, bytes);
3671         array[DEVCONF_FORWARDING] = cnf->forwarding;
3672         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
3673         array[DEVCONF_MTU6] = cnf->mtu6;
3674         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
3675         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
3676         array[DEVCONF_AUTOCONF] = cnf->autoconf;
3677         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
3678         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
3679         array[DEVCONF_RTR_SOLICIT_INTERVAL] = cnf->rtr_solicit_interval;
3680         array[DEVCONF_RTR_SOLICIT_DELAY] = cnf->rtr_solicit_delay;
3681         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
3682 #ifdef CONFIG_IPV6_PRIVACY
3683         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
3684         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
3685         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
3686         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
3687         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
3688 #endif
3689         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
3690         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
3691         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
3692 #ifdef CONFIG_IPV6_ROUTER_PREF
3693         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
3694         array[DEVCONF_RTR_PROBE_INTERVAL] = cnf->rtr_probe_interval;
3695 #ifdef CONFIG_IPV6_ROUTE_INFO
3696         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
3697 #endif
3698 #endif
3699         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
3700         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
3701 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3702         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
3703 #endif
3704 #ifdef CONFIG_IPV6_MROUTE
3705         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
3706 #endif
3707         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
3708         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
3709 }
3710 
3711 static inline size_t inet6_if_nlmsg_size(void)
3712 {
3713         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
3714                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
3715                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
3716                + nla_total_size(4) /* IFLA_MTU */
3717                + nla_total_size(4) /* IFLA_LINK */
3718                + nla_total_size( /* IFLA_PROTINFO */
3719                         nla_total_size(4) /* IFLA_INET6_FLAGS */
3720                         + nla_total_size(sizeof(struct ifla_cacheinfo))
3721                         + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
3722                         + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
3723                         + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
3724                  );
3725 }
3726 
3727 static inline void __snmp6_fill_stats(u64 *stats, void **mib, int items,
3728                                       int bytes)
3729 {
3730         int i;
3731         int pad = bytes - sizeof(u64) * items;
3732         BUG_ON(pad < 0);
3733 
3734         /* Use put_unaligned() because stats may not be aligned for u64. */
3735         put_unaligned(items, &stats[0]);
3736         for (i = 1; i < items; i++)
3737                 put_unaligned(snmp_fold_field(mib, i), &stats[i]);
3738 
3739         memset(&stats[items], 0, pad);
3740 }
3741 
3742 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
3743                              int bytes)
3744 {
3745         switch(attrtype) {
3746         case IFLA_INET6_STATS:
3747                 __snmp6_fill_stats(stats, (void **)idev->stats.ipv6, IPSTATS_MIB_MAX, bytes);
3748                 break;
3749         case IFLA_INET6_ICMP6STATS:
3750                 __snmp6_fill_stats(stats, (void **)idev->stats.icmpv6, ICMP6_MIB_MAX, bytes);
3751                 break;
3752         }
3753 }
3754 
3755 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
3756                              u32 pid, u32 seq, int event, unsigned int flags)
3757 {
3758         struct net_device *dev = idev->dev;
3759         struct nlattr *nla;
3760         struct ifinfomsg *hdr;
3761         struct nlmsghdr *nlh;
3762         void *protoinfo;
3763         struct ifla_cacheinfo ci;
3764 
3765         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags);
3766         if (nlh == NULL)
3767                 return -EMSGSIZE;
3768 
3769         hdr = nlmsg_data(nlh);
3770         hdr->ifi_family = AF_INET6;
3771         hdr->__ifi_pad = 0;
3772         hdr->ifi_type = dev->type;
3773         hdr->ifi_index = dev->ifindex;
3774         hdr->ifi_flags = dev_get_flags(dev);
3775         hdr->ifi_change = 0;
3776 
3777         NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
3778 
3779         if (dev->addr_len)
3780                 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
3781 
3782         NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
3783         if (dev->ifindex != dev->iflink)
3784                 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
3785 
3786         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
3787         if (protoinfo == NULL)
3788                 goto nla_put_failure;
3789 
3790         NLA_PUT_U32(skb, IFLA_INET6_FLAGS, idev->if_flags);
3791 
3792         ci.max_reasm_len = IPV6_MAXPLEN;
3793         ci.tstamp = (__u32)(TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) / HZ * 100
3794                     + TIME_DELTA(idev->tstamp, INITIAL_JIFFIES) % HZ * 100 / HZ);
3795         ci.reachable_time = idev->nd_parms->reachable_time;
3796         ci.retrans_time = idev->nd_parms->retrans_time;
3797         NLA_PUT(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci);
3798 
3799         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
3800         if (nla == NULL)
3801                 goto nla_put_failure;
3802         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
3803 
3804         /* XXX - MC not implemented */
3805 
3806         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
3807         if (nla == NULL)
3808                 goto nla_put_failure;
3809         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
3810 
3811         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
3812         if (nla == NULL)
3813                 goto nla_put_failure;
3814         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
3815 
3816         nla_nest_end(skb, protoinfo);
3817         return nlmsg_end(skb, nlh);
3818 
3819 nla_put_failure:
3820         nlmsg_cancel(skb, nlh);
3821         return -EMSGSIZE;
3822 }
3823 
3824 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
3825 {
3826         struct net *net = sock_net(skb->sk);
3827         int idx, err;
3828         int s_idx = cb->args[0];
3829         struct net_device *dev;
3830         struct inet6_dev *idev;
3831 
3832         read_lock(&dev_base_lock);
3833         idx = 0;
3834         for_each_netdev(net, dev) {
3835                 if (idx < s_idx)
3836                         goto cont;
3837                 if ((idev = in6_dev_get(dev)) == NULL)
3838                         goto cont;
3839                 err = inet6_fill_ifinfo(skb, idev, NETLINK_CB(cb->skb).pid,
3840                                 cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
3841                 in6_dev_put(idev);
3842                 if (err <= 0)
3843                         break;
3844 cont:
3845                 idx++;
3846         }
3847         read_unlock(&dev_base_lock);
3848         cb->args[0] = idx;
3849 
3850         return skb->len;
3851 }
3852 
3853 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
3854 {
3855         struct sk_buff *skb;
3856         struct net *net = dev_net(idev->dev);
3857         int err = -ENOBUFS;
3858 
3859         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
3860         if (skb == NULL)
3861                 goto errout;
3862 
3863         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
3864         if (err < 0) {
3865                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
3866                 WARN_ON(err == -EMSGSIZE);
3867                 kfree_skb(skb);
3868                 goto errout;
3869         }
3870         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3871         return;
3872 errout:
3873         if (err < 0)
3874                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3875 }
3876 
3877 static inline size_t inet6_prefix_nlmsg_size(void)
3878 {
3879         return NLMSG_ALIGN(sizeof(struct prefixmsg))
3880                + nla_total_size(sizeof(struct in6_addr))
3881                + nla_total_size(sizeof(struct prefix_cacheinfo));
3882 }
3883 
3884 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
3885                              struct prefix_info *pinfo, u32 pid, u32 seq,
3886                              int event, unsigned int flags)
3887 {
3888         struct prefixmsg *pmsg;
3889         struct nlmsghdr *nlh;
3890         struct prefix_cacheinfo ci;
3891 
3892         nlh = nlmsg_put(skb, pid, seq, event, sizeof(*pmsg), flags);
3893         if (nlh == NULL)
3894                 return -EMSGSIZE;
3895 
3896         pmsg = nlmsg_data(nlh);
3897         pmsg->prefix_family = AF_INET6;
3898         pmsg->prefix_pad1 = 0;
3899         pmsg->prefix_pad2 = 0;
3900         pmsg->prefix_ifindex = idev->dev->ifindex;
3901         pmsg->prefix_len = pinfo->prefix_len;
3902         pmsg->prefix_type = pinfo->type;
3903         pmsg->prefix_pad3 = 0;
3904         pmsg->prefix_flags = 0;
3905         if (pinfo->onlink)
3906                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
3907         if (pinfo->autoconf)
3908                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
3909 
3910         NLA_PUT(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix);
3911 
3912         ci.preferred_time = ntohl(pinfo->prefered);
3913         ci.valid_time = ntohl(pinfo->valid);
3914         NLA_PUT(skb, PREFIX_CACHEINFO, sizeof(ci), &ci);
3915 
3916         return nlmsg_end(skb, nlh);
3917 
3918 nla_put_failure:
3919         nlmsg_cancel(skb, nlh);
3920         return -EMSGSIZE;
3921 }
3922 
3923 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
3924                          struct prefix_info *pinfo)
3925 {
3926         struct sk_buff *skb;
3927         struct net *net = dev_net(idev->dev);
3928         int err = -ENOBUFS;
3929 
3930         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
3931         if (skb == NULL)
3932                 goto errout;
3933 
3934         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
3935         if (err < 0) {
3936                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
3937                 WARN_ON(err == -EMSGSIZE);
3938                 kfree_skb(skb);
3939                 goto errout;
3940         }
3941         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
3942         return;
3943 errout:
3944         if (err < 0)
3945                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
3946 }
3947 
3948 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3949 {
3950         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
3951 
3952         switch (event) {
3953         case RTM_NEWADDR:
3954                 /*
3955                  * If the address was optimistic
3956                  * we inserted the route at the start of
3957                  * our DAD process, so we don't need
3958                  * to do it again
3959                  */
3960                 if (!(ifp->rt->rt6i_node))
3961                         ip6_ins_rt(ifp->rt);
3962                 if (ifp->idev->cnf.forwarding)
3963                         addrconf_join_anycast(ifp);
3964                 break;
3965         case RTM_DELADDR:
3966                 if (ifp->idev->cnf.forwarding)
3967                         addrconf_leave_anycast(ifp);
3968                 addrconf_leave_solict(ifp->idev, &ifp->addr);
3969                 dst_hold(&ifp->rt->u.dst);
3970                 if (ip6_del_rt(ifp->rt))
3971                         dst_free(&ifp->rt->u.dst);
3972                 break;
3973         }
3974 }
3975 
3976 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
3977 {
3978         rcu_read_lock_bh();
3979         if (likely(ifp->idev->dead == 0))
3980                 __ipv6_ifa_notify(event, ifp);
3981         rcu_read_unlock_bh();
3982 }
3983 
3984 #ifdef CONFIG_SYSCTL
3985 
3986 static
3987 int addrconf_sysctl_forward(ctl_table *ctl, int write,
3988                            void __user *buffer, size_t *lenp, loff_t *ppos)
3989 {
3990         int *valp = ctl->data;
3991         int val = *valp;
3992         loff_t pos = *ppos;
3993         int ret;
3994 
3995         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
3996 
3997         if (write)
3998                 ret = addrconf_fixup_forwarding(ctl, valp, val);
3999         if (ret)
4000                 *ppos = pos;
4001         return ret;
4002 }
4003 
4004 static int addrconf_sysctl_forward_strategy(ctl_table *table,
4005                                             void __user *oldval,
4006                                             size_t __user *oldlenp,
4007                                             void __user *newval, size_t newlen)
4008 {
4009         int *valp = table->data;
4010         int val = *valp;
4011         int new;
4012 
4013         if (!newval || !newlen)
4014                 return 0;
4015         if (newlen != sizeof(int))
4016                 return -EINVAL;
4017         if (get_user(new, (int __user *)newval))
4018                 return -EFAULT;
4019         if (new == *valp)
4020                 return 0;
4021         if (oldval && oldlenp) {
4022                 size_t len;
4023                 if (get_user(len, oldlenp))
4024                         return -EFAULT;
4025                 if (len) {
4026                         if (len > table->maxlen)
4027                                 len = table->maxlen;
4028                         if (copy_to_user(oldval, valp, len))
4029                                 return -EFAULT;
4030                         if (put_user(len, oldlenp))
4031                                 return -EFAULT;
4032                 }
4033         }
4034 
4035         *valp = new;
4036         return addrconf_fixup_forwarding(table, valp, val);
4037 }
4038 
4039 static
4040 struct ctl_table *addrconf_sysctl_mtu_init(struct ctl_table *newctl,
4041                                            const struct ctl_table *ctl)
4042 {
4043         struct inet6_dev *idev = ctl->extra1;
4044         static int min_mtu = IPV6_MIN_MTU;
4045 
4046         *newctl = *ctl;
4047         newctl->extra1 = &min_mtu;
4048         newctl->extra2 = idev ? &idev->dev->mtu : NULL;
4049         return newctl;
4050 }
4051 
4052 static
4053 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
4054                         void __user *buffer, size_t *lenp, loff_t *ppos)
4055 {
4056         struct ctl_table lctl;
4057 
4058         return proc_dointvec_minmax(addrconf_sysctl_mtu_init(&lctl, ctl),
4059                                     write, buffer, lenp, ppos);
4060 }
4061 
4062 static int addrconf_sysctl_mtu_strategy(struct ctl_table *ctl,
4063                                         void __user *oldval,
4064                                         size_t __user *oldlenp,
4065                                         void __user *newval, size_t newlen)
4066 {
4067         struct ctl_table lctl;
4068 
4069         return sysctl_intvec(addrconf_sysctl_mtu_init(&lctl, ctl),
4070                              oldval, oldlenp, newval, newlen);
4071 }
4072 
4073 static void dev_disable_change(struct inet6_dev *idev)
4074 {
4075         if (!idev || !idev->dev)
4076                 return;
4077 
4078         if (idev->cnf.disable_ipv6)
4079                 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4080         else
4081                 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4082 }
4083 
4084 static void addrconf_disable_change(struct net *net, __s32 newf)
4085 {
4086         struct net_device *dev;
4087         struct inet6_dev *idev;
4088 
4089         read_lock(&dev_base_lock);
4090         for_each_netdev(net, dev) {
4091                 rcu_read_lock();
4092                 idev = __in6_dev_get(dev);
4093                 if (idev) {
4094                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4095                         idev->cnf.disable_ipv6 = newf;
4096                         if (changed)
4097                                 dev_disable_change(idev);
4098                 }
4099                 rcu_read_unlock();
4100         }
4101         read_unlock(&dev_base_lock);
4102 }
4103 
4104 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int old)
4105 {
4106         struct net *net;
4107 
4108         net = (struct net *)table->extra2;
4109 
4110         if (p == &net->ipv6.devconf_dflt->disable_ipv6)
4111                 return 0;
4112 
4113         if (!rtnl_trylock()) {
4114                 /* Restore the original values before restarting */
4115                 *p = old;
4116                 return restart_syscall();
4117         }
4118 
4119         if (p == &net->ipv6.devconf_all->disable_ipv6) {
4120                 __s32 newf = net->ipv6.devconf_all->disable_ipv6;
4121                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4122                 addrconf_disable_change(net, newf);
4123         } else if ((!*p) ^ (!old))
4124                 dev_disable_change((struct inet6_dev *)table->extra1);
4125 
4126         rtnl_unlock();
4127         return 0;
4128 }
4129 
4130 static
4131 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4132                             void __user *buffer, size_t *lenp, loff_t *ppos)
4133 {
4134         int *valp = ctl->data;
4135         int val = *valp;
4136         loff_t pos = *ppos;
4137         int ret;
4138 
4139         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
4140 
4141         if (write)
4142                 ret = addrconf_disable_ipv6(ctl, valp, val);
4143         if (ret)
4144                 *ppos = pos;
4145         return ret;
4146 }
4147 
4148 static struct addrconf_sysctl_table
4149 {
4150         struct ctl_table_header *sysctl_header;
4151         ctl_table addrconf_vars[DEVCONF_MAX+1];
4152         char *dev_name;
4153 } addrconf_sysctl __read_mostly = {
4154         .sysctl_header = NULL,
4155         .addrconf_vars = {
4156                 {
4157                         .ctl_name       =       NET_IPV6_FORWARDING,
4158                         .procname       =       "forwarding",
4159                         .data           =       &ipv6_devconf.forwarding,
4160                         .maxlen         =       sizeof(int),
4161                         .mode           =       0644,
4162                         .proc_handler   =       addrconf_sysctl_forward,
4163                         .strategy       =       addrconf_sysctl_forward_strategy,
4164                 },
4165                 {
4166                         .ctl_name       =       NET_IPV6_HOP_LIMIT,
4167                         .procname       =       "hop_limit",
4168                         .data           =       &ipv6_devconf.hop_limit,
4169                         .maxlen         =       sizeof(int),
4170                         .mode           =       0644,
4171                         .proc_handler   =       proc_dointvec,
4172                 },
4173                 {
4174                         .ctl_name       =       NET_IPV6_MTU,
4175                         .procname       =       "mtu",
4176                         .data           =       &ipv6_devconf.mtu6,
4177                         .maxlen         =       sizeof(int),
4178                         .mode           =       0644,
4179                         .proc_handler   =       addrconf_sysctl_mtu,
4180                         .strategy       =       addrconf_sysctl_mtu_strategy,
4181                 },
4182                 {
4183                         .ctl_name       =       NET_IPV6_ACCEPT_RA,
4184                         .procname       =       "accept_ra",
4185                         .data           =       &ipv6_devconf.accept_ra,
4186                         .maxlen         =       sizeof(int),
4187                         .mode           =       0644,
4188                         .proc_handler   =       proc_dointvec,
4189                 },
4190                 {
4191                         .ctl_name       =       NET_IPV6_ACCEPT_REDIRECTS,
4192                         .procname       =       "accept_redirects",
4193                         .data           =       &ipv6_devconf.accept_redirects,
4194                         .maxlen         =       sizeof(int),
4195                         .mode           =       0644,
4196                         .proc_handler   =       proc_dointvec,
4197                 },
4198                 {
4199                         .ctl_name       =       NET_IPV6_AUTOCONF,
4200                         .procname       =       "autoconf",
4201                         .data           =       &ipv6_devconf.autoconf,
4202                         .maxlen         =       sizeof(int),
4203                         .mode           =       0644,
4204                         .proc_handler   =       proc_dointvec,
4205                 },
4206                 {
4207                         .ctl_name       =       NET_IPV6_DAD_TRANSMITS,
4208                         .procname       =       "dad_transmits",
4209                         .data           =       &ipv6_devconf.dad_transmits,
4210                         .maxlen         =       sizeof(int),
4211                         .mode           =       0644,
4212                         .proc_handler   =       proc_dointvec,
4213                 },
4214                 {
4215                         .ctl_name       =       NET_IPV6_RTR_SOLICITS,
4216                         .procname       =       "router_solicitations",
4217                         .data           =       &ipv6_devconf.rtr_solicits,
4218                         .maxlen         =       sizeof(int),
4219                         .mode           =       0644,
4220                         .proc_handler   =       proc_dointvec,
4221                 },
4222                 {
4223                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_INTERVAL,
4224                         .procname       =       "router_solicitation_interval",
4225                         .data           =       &ipv6_devconf.rtr_solicit_interval,
4226                         .maxlen         =       sizeof(int),
4227                         .mode           =       0644,
4228                         .proc_handler   =       proc_dointvec_jiffies,
4229                         .strategy       =       sysctl_jiffies,
4230                 },
4231                 {
4232                         .ctl_name       =       NET_IPV6_RTR_SOLICIT_DELAY,
4233                         .procname       =       "router_solicitation_delay",
4234                         .data           =       &ipv6_devconf.rtr_solicit_delay,
4235                         .maxlen         =       sizeof(int),
4236                         .mode           =       0644,
4237                         .proc_handler   =       proc_dointvec_jiffies,
4238                         .strategy       =       sysctl_jiffies,
4239                 },
4240                 {
4241                         .ctl_name       =       NET_IPV6_FORCE_MLD_VERSION,
4242                         .procname       =       "force_mld_version",
4243                         .data           =       &ipv6_devconf.force_mld_version,
4244                         .maxlen         =       sizeof(int),
4245                         .mode           =       0644,
4246                         .proc_handler   =       proc_dointvec,
4247                 },
4248 #ifdef CONFIG_IPV6_PRIVACY
4249                 {
4250                         .ctl_name       =       NET_IPV6_USE_TEMPADDR,
4251                         .procname       =       "use_tempaddr",
4252                         .data           =       &ipv6_devconf.use_tempaddr,
4253                         .maxlen         =       sizeof(int),
4254                         .mode           =       0644,
4255                         .proc_handler   =       proc_dointvec,
4256                 },
4257                 {
4258                         .ctl_name       =       NET_IPV6_TEMP_VALID_LFT,
4259                         .procname       =       "temp_valid_lft",
4260                         .data           =       &ipv6_devconf.temp_valid_lft,
4261                         .maxlen         =       sizeof(int),
4262                         .mode           =       0644,
4263                         .proc_handler   =       proc_dointvec,
4264                 },
4265                 {
4266                         .ctl_name       =       NET_IPV6_TEMP_PREFERED_LFT,
4267                         .procname       =       "temp_prefered_lft",
4268                         .data           =       &ipv6_devconf.temp_prefered_lft,
4269                         .maxlen         =       sizeof(int),
4270                         .mode           =       0644,
4271                         .proc_handler   =       proc_dointvec,
4272                 },
4273                 {
4274                         .ctl_name       =       NET_IPV6_REGEN_MAX_RETRY,
4275                         .procname       =       "regen_max_retry",
4276                         .data           =       &ipv6_devconf.regen_max_retry,
4277                         .maxlen         =       sizeof(int),
4278                         .mode           =       0644,
4279                         .proc_handler   =       proc_dointvec,
4280                 },
4281                 {
4282                         .ctl_name       =       NET_IPV6_MAX_DESYNC_FACTOR,
4283                         .procname       =       "max_desync_factor",
4284                         .data           =       &ipv6_devconf.max_desync_factor,
4285                         .maxlen         =       sizeof(int),
4286                         .mode           =       0644,
4287                         .proc_handler   =       proc_dointvec,
4288                 },
4289 #endif
4290                 {
4291                         .ctl_name       =       NET_IPV6_MAX_ADDRESSES,
4292                         .procname       =       "max_addresses",
4293                         .data           =       &ipv6_devconf.max_addresses,
4294                         .maxlen         =       sizeof(int),
4295                         .mode           =       0644,
4296                         .proc_handler   =       proc_dointvec,
4297                 },
4298                 {
4299                         .ctl_name       =       NET_IPV6_ACCEPT_RA_DEFRTR,
4300                         .procname       =       "accept_ra_defrtr",
4301                         .data           =       &ipv6_devconf.accept_ra_defrtr,
4302                         .maxlen         =       sizeof(int),
4303                         .mode           =       0644,
4304                         .proc_handler   =       proc_dointvec,
4305                 },
4306                 {
4307                         .ctl_name       =       NET_IPV6_ACCEPT_RA_PINFO,
4308                         .procname       =       "accept_ra_pinfo",
4309                         .data           =       &ipv6_devconf.accept_ra_pinfo,
4310                         .maxlen         =       sizeof(int),
4311                         .mode           =       0644,
4312                         .proc_handler   =       proc_dointvec,
4313                 },
4314 #ifdef CONFIG_IPV6_ROUTER_PREF
4315                 {
4316                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RTR_PREF,
4317                         .procname       =       "accept_ra_rtr_pref",
4318                         .data           =       &ipv6_devconf.accept_ra_rtr_pref,
4319                         .maxlen         =       sizeof(int),
4320                         .mode           =       0644,
4321                         .proc_handler   =       proc_dointvec,
4322                 },
4323                 {
4324                         .ctl_name       =       NET_IPV6_RTR_PROBE_INTERVAL,
4325                         .procname       =       "router_probe_interval",
4326                         .data           =       &ipv6_devconf.rtr_probe_interval,
4327                         .maxlen         =       sizeof(int),
4328                         .mode           =       0644,
4329                         .proc_handler   =       proc_dointvec_jiffies,
4330                         .strategy       =       sysctl_jiffies,
4331                 },
4332 #ifdef CONFIG_IPV6_ROUTE_INFO
4333                 {
4334                         .ctl_name       =       NET_IPV6_ACCEPT_RA_RT_INFO_MAX_PLEN,
4335                         .procname       =       "accept_ra_rt_info_max_plen",
4336                         .data           =       &ipv6_devconf.accept_ra_rt_info_max_plen,
4337                         .maxlen         =       sizeof(int),
4338                         .mode           =       0644,
4339                         .proc_handler   =       proc_dointvec,
4340                 },
4341 #endif
4342 #endif
4343                 {
4344                         .ctl_name       =       NET_IPV6_PROXY_NDP,
4345                         .procname       =       "proxy_ndp",
4346                         .data           =       &ipv6_devconf.proxy_ndp,
4347                         .maxlen         =       sizeof(int),
4348                         .mode           =       0644,
4349                         .proc_handler   =       proc_dointvec,
4350                 },
4351                 {
4352                         .ctl_name       =       NET_IPV6_ACCEPT_SOURCE_ROUTE,
4353                         .procname       =       "accept_source_route",
4354                         .data           =       &ipv6_devconf.accept_source_route,
4355                         .maxlen         =       sizeof(int),
4356                         .mode           =       0644,
4357                         .proc_handler   =       proc_dointvec,
4358                 },
4359 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4360                 {
4361                         .ctl_name       =       CTL_UNNUMBERED,
4362                         .procname       =       "optimistic_dad",
4363                         .data           =       &ipv6_devconf.optimistic_dad,
4364                         .maxlen         =       sizeof(int),
4365                         .mode           =       0644,
4366                         .proc_handler   =       proc_dointvec,
4367 
4368                 },
4369 #endif
4370 #ifdef CONFIG_IPV6_MROUTE
4371                 {
4372                         .ctl_name       =       CTL_UNNUMBERED,
4373                         .procname       =       "mc_forwarding",
4374                         .data           =       &ipv6_devconf.mc_forwarding,
4375                         .maxlen         =       sizeof(int),
4376                         .mode           =       0444,
4377                         .proc_handler   =       proc_dointvec,
4378                 },
4379 #endif
4380                 {
4381                         .ctl_name       =       CTL_UNNUMBERED,
4382                         .procname       =       "disable_ipv6",
4383                         .data           =       &ipv6_devconf.disable_ipv6,
4384                         .maxlen         =       sizeof(int),
4385                         .mode           =       0644,
4386                         .proc_handler   =       addrconf_sysctl_disable,
4387                         .strategy       =       sysctl_intvec,
4388                 },
4389                 {
4390                         .ctl_name       =       CTL_UNNUMBERED,
4391                         .procname       =       "accept_dad",
4392                         .data           =       &ipv6_devconf.accept_dad,
4393                         .maxlen         =       sizeof(int),
4394                         .mode           =       0644,
4395                         .proc_handler   =       proc_dointvec,
4396                 },
4397                 {
4398                         .ctl_name       =       0,      /* sentinel */
4399                 }
4400         },
4401 };
4402 
4403 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4404                 int ctl_name, struct inet6_dev *idev, struct ipv6_devconf *p)
4405 {
4406         int i;
4407         struct addrconf_sysctl_table *t;
4408 
4409 #define ADDRCONF_CTL_PATH_DEV   3
4410 
4411         struct ctl_path addrconf_ctl_path[] = {
4412                 { .procname = "net", .ctl_name = CTL_NET, },
4413                 { .procname = "ipv6", .ctl_name = NET_IPV6, },
4414                 { .procname = "conf", .ctl_name = NET_IPV6_CONF, },
4415                 { /* to be set */ },
4416                 { },
4417         };
4418 
4419 
4420         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4421         if (t == NULL)
4422                 goto out;
4423 
4424         for (i=0; t->addrconf_vars[i].data; i++) {
4425                 t->addrconf_vars[i].data += (char*)p - (char*)&ipv6_devconf;
4426                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4427                 t->addrconf_vars[i].extra2 = net;
4428         }
4429 
4430         /*
4431          * Make a copy of dev_name, because '.procname' is regarded as const
4432          * by sysctl and we wouldn't want anyone to change it under our feet
4433          * (see SIOCSIFNAME).
4434          */
4435         t->dev_name = kstrdup(dev_name, GFP_KERNEL);
4436         if (!t->dev_name)
4437                 goto free;
4438 
4439         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].procname = t->dev_name;
4440         addrconf_ctl_path[ADDRCONF_CTL_PATH_DEV].ctl_name = ctl_name;
4441 
4442         t->sysctl_header = register_net_sysctl_table(net, addrconf_ctl_path,
4443                         t->addrconf_vars);
4444         if (t->sysctl_header == NULL)
4445                 goto free_procname;
4446 
4447         p->sysctl = t;
4448         return 0;
4449 
4450 free_procname:
4451         kfree(t->dev_name);
4452 free:
4453         kfree(t);
4454 out:
4455         return -ENOBUFS;
4456 }
4457 
4458 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4459 {
4460         struct addrconf_sysctl_table *t;
4461 
4462         if (p->sysctl == NULL)
4463                 return;
4464 
4465         t = p->sysctl;
4466         p->sysctl = NULL;
4467         unregister_sysctl_table(t->sysctl_header);
4468         kfree(t->dev_name);
4469         kfree(t);
4470 }
4471 
4472 static void addrconf_sysctl_register(struct inet6_dev *idev)
4473 {
4474         neigh_sysctl_register(idev->dev, idev->nd_parms, NET_IPV6,
4475                               NET_IPV6_NEIGH, "ipv6",
4476                               &ndisc_ifinfo_sysctl_change,
4477                               ndisc_ifinfo_sysctl_strategy);
4478         __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4479                         idev->dev->ifindex, idev, &idev->cnf);
4480 }
4481 
4482 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4483 {
4484         __addrconf_sysctl_unregister(&idev->cnf);
4485         neigh_sysctl_unregister(idev->nd_parms);
4486 }
4487 
4488 
4489 #endif
4490 
4491 static int addrconf_init_net(struct net *net)
4492 {
4493         int err;
4494         struct ipv6_devconf *all, *dflt;
4495 
4496         err = -ENOMEM;
4497         all = &ipv6_devconf;
4498         dflt = &ipv6_devconf_dflt;
4499 
4500         if (net != &init_net) {
4501                 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4502                 if (all == NULL)
4503                         goto err_alloc_all;
4504 
4505                 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4506                 if (dflt == NULL)
4507                         goto err_alloc_dflt;
4508         } else {
4509                 /* these will be inherited by all namespaces */
4510                 dflt->autoconf = ipv6_defaults.autoconf;
4511                 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4512         }
4513 
4514         net->ipv6.devconf_all = all;
4515         net->ipv6.devconf_dflt = dflt;
4516 
4517 #ifdef CONFIG_SYSCTL
4518         err = __addrconf_sysctl_register(net, "all", NET_PROTO_CONF_ALL,
4519                         NULL, all);
4520         if (err < 0)
4521                 goto err_reg_all;
4522 
4523         err = __addrconf_sysctl_register(net, "default", NET_PROTO_CONF_DEFAULT,
4524                         NULL, dflt);
4525         if (err < 0)
4526                 goto err_reg_dflt;
4527 #endif
4528         return 0;
4529 
4530 #ifdef CONFIG_SYSCTL
4531 err_reg_dflt:
4532         __addrconf_sysctl_unregister(all);
4533 err_reg_all:
4534         kfree(dflt);
4535 #endif
4536 err_alloc_dflt:
4537         kfree(all);
4538 err_alloc_all:
4539         return err;
4540 }
4541 
4542 static void addrconf_exit_net(struct net *net)
4543 {
4544 #ifdef CONFIG_SYSCTL
4545         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4546         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4547 #endif
4548         if (net != &init_net) {
4549                 kfree(net->ipv6.devconf_dflt);
4550                 kfree(net->ipv6.devconf_all);
4551         }
4552 }
4553 
4554 static struct pernet_operations addrconf_ops = {
4555         .init = addrconf_init_net,
4556         .exit = addrconf_exit_net,
4557 };
4558 
4559 /*
4560  *      Device notifier
4561  */
4562 
4563 int register_inet6addr_notifier(struct notifier_block *nb)
4564 {
4565         return atomic_notifier_chain_register(&inet6addr_chain, nb);
4566 }
4567 
4568 EXPORT_SYMBOL(register_inet6addr_notifier);
4569 
4570 int unregister_inet6addr_notifier(struct notifier_block *nb)
4571 {
4572         return atomic_notifier_chain_unregister(&inet6addr_chain,nb);
4573 }
4574 
4575 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4576 
4577 /*
4578  *      Init / cleanup code
4579  */
4580 
4581 int __init addrconf_init(void)
4582 {
4583         int err;
4584 
4585         if ((err = ipv6_addr_label_init()) < 0) {
4586                 printk(KERN_CRIT "IPv6 Addrconf: cannot initialize default policy table: %d.\n",
4587                         err);
4588                 return err;
4589         }
4590 
4591         register_pernet_subsys(&addrconf_ops);
4592 
4593         /* The addrconf netdev notifier requires that loopback_dev
4594          * has it's ipv6 private information allocated and setup
4595          * before it can bring up and give link-local addresses
4596          * to other devices which are up.
4597          *
4598          * Unfortunately, loopback_dev is not necessarily the first
4599          * entry in the global dev_base list of net devices.  In fact,
4600          * it is likely to be the very last entry on that list.
4601          * So this causes the notifier registry below to try and
4602          * give link-local addresses to all devices besides loopback_dev
4603          * first, then loopback_dev, which cases all the non-loopback_dev
4604          * devices to fail to get a link-local address.
4605          *
4606          * So, as a temporary fix, allocate the ipv6 structure for
4607          * loopback_dev first by hand.
4608          * Longer term, all of the dependencies ipv6 has upon the loopback
4609          * device and it being up should be removed.
4610          */
4611         rtnl_lock();
4612         if (!ipv6_add_dev(init_net.loopback_dev))
4613                 err = -ENOMEM;
4614         rtnl_unlock();
4615         if (err)
4616                 goto errlo;
4617 
4618         register_netdevice_notifier(&ipv6_dev_notf);
4619 
4620         addrconf_verify(0);
4621 
4622         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo);
4623         if (err < 0)
4624                 goto errout;
4625 
4626         /* Only the first call to __rtnl_register can fail */
4627         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL);
4628         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL);
4629         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr, inet6_dump_ifaddr);
4630         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL, inet6_dump_ifmcaddr);
4631         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL, inet6_dump_ifacaddr);
4632 
4633         ipv6_addr_label_rtnl_register();
4634 
4635         return 0;
4636 errout:
4637         unregister_netdevice_notifier(&ipv6_dev_notf);
4638 errlo:
4639         unregister_pernet_subsys(&addrconf_ops);
4640 
4641         return err;
4642 }
4643 
4644 void addrconf_cleanup(void)
4645 {
4646         struct inet6_ifaddr *ifa;
4647         struct net_device *dev;
4648         int i;
4649 
4650         unregister_netdevice_notifier(&ipv6_dev_notf);
4651         unregister_pernet_subsys(&addrconf_ops);
4652 
4653         rtnl_lock();
4654 
4655         /* clean dev list */
4656         for_each_netdev(&init_net, dev) {
4657                 if (__in6_dev_get(dev) == NULL)
4658                         continue;
4659                 addrconf_ifdown(dev, 1);
4660         }
4661         addrconf_ifdown(init_net.loopback_dev, 2);
4662 
4663         /*
4664          *      Check hash table.
4665          */
4666         write_lock_bh(&addrconf_hash_lock);
4667         for (i=0; i < IN6_ADDR_HSIZE; i++) {
4668                 for (ifa=inet6_addr_lst[i]; ifa; ) {
4669                         struct inet6_ifaddr *bifa;
4670 
4671                         bifa = ifa;
4672                         ifa = ifa->lst_next;
4673                         printk(KERN_DEBUG "bug: IPv6 address leakage detected: ifa=%p\n", bifa);
4674                         /* Do not free it; something is wrong.
4675                            Now we can investigate it with debugger.
4676                          */
4677                 }
4678         }
4679         write_unlock_bh(&addrconf_hash_lock);
4680 
4681         del_timer(&addr_chk_timer);
4682         rtnl_unlock();
4683 }
4684 

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