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TOMOYO Linux Cross Reference
Linux/net/ipv6/addrconf.c

Version: ~ [ linux-6.1-rc7 ] ~ [ linux-6.0.10 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.80 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.156 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.225 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.267 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.300 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.334 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
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  1 /*
  2  *      IPv6 Address [auto]configuration
  3  *      Linux INET6 implementation
  4  *
  5  *      Authors:
  6  *      Pedro Roque             <roque@di.fc.ul.pt>
  7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
  8  *
  9  *      This program is free software; you can redistribute it and/or
 10  *      modify it under the terms of the GNU General Public License
 11  *      as published by the Free Software Foundation; either version
 12  *      2 of the License, or (at your option) any later version.
 13  */
 14 
 15 /*
 16  *      Changes:
 17  *
 18  *      Janos Farkas                    :       delete timer on ifdown
 19  *      <chexum@bankinf.banki.hu>
 20  *      Andi Kleen                      :       kill double kfree on module
 21  *                                              unload.
 22  *      Maciej W. Rozycki               :       FDDI support
 23  *      sekiya@USAGI                    :       Don't send too many RS
 24  *                                              packets.
 25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
 26  *                                              packets.
 27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
 28  *                                              address validation timer.
 29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
 30  *                                              support.
 31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
 32  *                                              address on a same interface.
 33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
 34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
 35  *                                              seq_file.
 36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
 37  *                                              selection; consider scope,
 38  *                                              status etc.
 39  */
 40 
 41 #define pr_fmt(fmt) "IPv6: " fmt
 42 
 43 #include <linux/errno.h>
 44 #include <linux/types.h>
 45 #include <linux/kernel.h>
 46 #include <linux/socket.h>
 47 #include <linux/sockios.h>
 48 #include <linux/net.h>
 49 #include <linux/inet.h>
 50 #include <linux/in6.h>
 51 #include <linux/netdevice.h>
 52 #include <linux/if_addr.h>
 53 #include <linux/if_arp.h>
 54 #include <linux/if_arcnet.h>
 55 #include <linux/if_infiniband.h>
 56 #include <linux/route.h>
 57 #include <linux/inetdevice.h>
 58 #include <linux/init.h>
 59 #include <linux/slab.h>
 60 #ifdef CONFIG_SYSCTL
 61 #include <linux/sysctl.h>
 62 #endif
 63 #include <linux/capability.h>
 64 #include <linux/delay.h>
 65 #include <linux/notifier.h>
 66 #include <linux/string.h>
 67 #include <linux/hash.h>
 68 
 69 #include <net/net_namespace.h>
 70 #include <net/sock.h>
 71 #include <net/snmp.h>
 72 
 73 #include <net/6lowpan.h>
 74 #include <net/firewire.h>
 75 #include <net/ipv6.h>
 76 #include <net/protocol.h>
 77 #include <net/ndisc.h>
 78 #include <net/ip6_route.h>
 79 #include <net/addrconf.h>
 80 #include <net/tcp.h>
 81 #include <net/ip.h>
 82 #include <net/netlink.h>
 83 #include <net/pkt_sched.h>
 84 #include <net/l3mdev.h>
 85 #include <linux/if_tunnel.h>
 86 #include <linux/rtnetlink.h>
 87 #include <linux/netconf.h>
 88 #include <linux/random.h>
 89 #include <linux/uaccess.h>
 90 #include <asm/unaligned.h>
 91 
 92 #include <linux/proc_fs.h>
 93 #include <linux/seq_file.h>
 94 #include <linux/export.h>
 95 
 96 /* Set to 3 to get tracing... */
 97 #define ACONF_DEBUG 2
 98 
 99 #if ACONF_DEBUG >= 3
100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
101 #else
102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
103 #endif
104 
105 #define INFINITY_LIFE_TIME      0xFFFFFFFF
106 
107 #define IPV6_MAX_STRLEN \
108         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109 
110 static inline u32 cstamp_delta(unsigned long cstamp)
111 {
112         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113 }
114 
115 #ifdef CONFIG_SYSCTL
116 static int addrconf_sysctl_register(struct inet6_dev *idev);
117 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118 #else
119 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
120 {
121         return 0;
122 }
123 
124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125 {
126 }
127 #endif
128 
129 static void __ipv6_regen_rndid(struct inet6_dev *idev);
130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
131 static void ipv6_regen_rndid(unsigned long data);
132 
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
135 static int ipv6_generate_stable_address(struct in6_addr *addr,
136                                         u8 dad_count,
137                                         const struct inet6_dev *idev);
138 
139 /*
140  *      Configured unicast address hash table
141  */
142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
143 static DEFINE_SPINLOCK(addrconf_hash_lock);
144 
145 static void addrconf_verify(void);
146 static void addrconf_verify_rtnl(void);
147 static void addrconf_verify_work(struct work_struct *);
148 
149 static struct workqueue_struct *addrconf_wq;
150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
151 
152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154 
155 static void addrconf_type_change(struct net_device *dev,
156                                  unsigned long event);
157 static int addrconf_ifdown(struct net_device *dev, int how);
158 
159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160                                                   int plen,
161                                                   const struct net_device *dev,
162                                                   u32 flags, u32 noflags);
163 
164 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
165 static void addrconf_dad_work(struct work_struct *w);
166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
167 static void addrconf_dad_run(struct inet6_dev *idev);
168 static void addrconf_rs_timer(unsigned long data);
169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171 
172 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
173                                 struct prefix_info *pinfo);
174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175                                struct net_device *dev);
176 
177 static struct ipv6_devconf ipv6_devconf __read_mostly = {
178         .forwarding             = 0,
179         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
180         .mtu6                   = IPV6_MIN_MTU,
181         .accept_ra              = 1,
182         .accept_redirects       = 1,
183         .autoconf               = 1,
184         .force_mld_version      = 0,
185         .mldv1_unsolicited_report_interval = 10 * HZ,
186         .mldv2_unsolicited_report_interval = HZ,
187         .dad_transmits          = 1,
188         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
189         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
190         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
191         .use_tempaddr           = 0,
192         .temp_valid_lft         = TEMP_VALID_LIFETIME,
193         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
194         .regen_max_retry        = REGEN_MAX_RETRY,
195         .max_desync_factor      = MAX_DESYNC_FACTOR,
196         .max_addresses          = IPV6_MAX_ADDRESSES,
197         .accept_ra_defrtr       = 1,
198         .accept_ra_from_local   = 0,
199         .accept_ra_min_hop_limit= 1,
200         .accept_ra_pinfo        = 1,
201 #ifdef CONFIG_IPV6_ROUTER_PREF
202         .accept_ra_rtr_pref     = 1,
203         .rtr_probe_interval     = 60 * HZ,
204 #ifdef CONFIG_IPV6_ROUTE_INFO
205         .accept_ra_rt_info_max_plen = 0,
206 #endif
207 #endif
208         .proxy_ndp              = 0,
209         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
210         .disable_ipv6           = 0,
211         .accept_dad             = 1,
212         .suppress_frag_ndisc    = 1,
213         .accept_ra_mtu          = 1,
214         .stable_secret          = {
215                 .initialized = false,
216         },
217         .use_oif_addrs_only     = 0,
218         .ignore_routes_with_linkdown = 0,
219         .keep_addr_on_down      = 0,
220 };
221 
222 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
223         .forwarding             = 0,
224         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
225         .mtu6                   = IPV6_MIN_MTU,
226         .accept_ra              = 1,
227         .accept_redirects       = 1,
228         .autoconf               = 1,
229         .force_mld_version      = 0,
230         .mldv1_unsolicited_report_interval = 10 * HZ,
231         .mldv2_unsolicited_report_interval = HZ,
232         .dad_transmits          = 1,
233         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
234         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
235         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
236         .use_tempaddr           = 0,
237         .temp_valid_lft         = TEMP_VALID_LIFETIME,
238         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
239         .regen_max_retry        = REGEN_MAX_RETRY,
240         .max_desync_factor      = MAX_DESYNC_FACTOR,
241         .max_addresses          = IPV6_MAX_ADDRESSES,
242         .accept_ra_defrtr       = 1,
243         .accept_ra_from_local   = 0,
244         .accept_ra_min_hop_limit= 1,
245         .accept_ra_pinfo        = 1,
246 #ifdef CONFIG_IPV6_ROUTER_PREF
247         .accept_ra_rtr_pref     = 1,
248         .rtr_probe_interval     = 60 * HZ,
249 #ifdef CONFIG_IPV6_ROUTE_INFO
250         .accept_ra_rt_info_max_plen = 0,
251 #endif
252 #endif
253         .proxy_ndp              = 0,
254         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
255         .disable_ipv6           = 0,
256         .accept_dad             = 1,
257         .suppress_frag_ndisc    = 1,
258         .accept_ra_mtu          = 1,
259         .stable_secret          = {
260                 .initialized = false,
261         },
262         .use_oif_addrs_only     = 0,
263         .ignore_routes_with_linkdown = 0,
264         .keep_addr_on_down      = 0,
265 };
266 
267 /* Check if a valid qdisc is available */
268 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
269 {
270         return !qdisc_tx_is_noop(dev);
271 }
272 
273 static void addrconf_del_rs_timer(struct inet6_dev *idev)
274 {
275         if (del_timer(&idev->rs_timer))
276                 __in6_dev_put(idev);
277 }
278 
279 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
280 {
281         if (cancel_delayed_work(&ifp->dad_work))
282                 __in6_ifa_put(ifp);
283 }
284 
285 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
286                                   unsigned long when)
287 {
288         if (!timer_pending(&idev->rs_timer))
289                 in6_dev_hold(idev);
290         mod_timer(&idev->rs_timer, jiffies + when);
291 }
292 
293 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
294                                    unsigned long delay)
295 {
296         if (!delayed_work_pending(&ifp->dad_work))
297                 in6_ifa_hold(ifp);
298         mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
299 }
300 
301 static int snmp6_alloc_dev(struct inet6_dev *idev)
302 {
303         int i;
304 
305         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
306         if (!idev->stats.ipv6)
307                 goto err_ip;
308 
309         for_each_possible_cpu(i) {
310                 struct ipstats_mib *addrconf_stats;
311                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
312                 u64_stats_init(&addrconf_stats->syncp);
313         }
314 
315 
316         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
317                                         GFP_KERNEL);
318         if (!idev->stats.icmpv6dev)
319                 goto err_icmp;
320         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
321                                            GFP_KERNEL);
322         if (!idev->stats.icmpv6msgdev)
323                 goto err_icmpmsg;
324 
325         return 0;
326 
327 err_icmpmsg:
328         kfree(idev->stats.icmpv6dev);
329 err_icmp:
330         free_percpu(idev->stats.ipv6);
331 err_ip:
332         return -ENOMEM;
333 }
334 
335 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
336 {
337         struct inet6_dev *ndev;
338         int err = -ENOMEM;
339 
340         ASSERT_RTNL();
341 
342         if (dev->mtu < IPV6_MIN_MTU)
343                 return ERR_PTR(-EINVAL);
344 
345         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
346         if (!ndev)
347                 return ERR_PTR(err);
348 
349         rwlock_init(&ndev->lock);
350         ndev->dev = dev;
351         INIT_LIST_HEAD(&ndev->addr_list);
352         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
353                     (unsigned long)ndev);
354         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
355 
356         if (ndev->cnf.stable_secret.initialized)
357                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
358         else
359                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
360 
361         ndev->cnf.mtu6 = dev->mtu;
362         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
363         if (!ndev->nd_parms) {
364                 kfree(ndev);
365                 return ERR_PTR(err);
366         }
367         if (ndev->cnf.forwarding)
368                 dev_disable_lro(dev);
369         /* We refer to the device */
370         dev_hold(dev);
371 
372         if (snmp6_alloc_dev(ndev) < 0) {
373                 ADBG(KERN_WARNING
374                         "%s: cannot allocate memory for statistics; dev=%s.\n",
375                         __func__, dev->name);
376                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
377                 dev_put(dev);
378                 kfree(ndev);
379                 return ERR_PTR(err);
380         }
381 
382         if (snmp6_register_dev(ndev) < 0) {
383                 ADBG(KERN_WARNING
384                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
385                         __func__, dev->name);
386                 goto err_release;
387         }
388 
389         /* One reference from device.  We must do this before
390          * we invoke __ipv6_regen_rndid().
391          */
392         in6_dev_hold(ndev);
393 
394         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
395                 ndev->cnf.accept_dad = -1;
396 
397 #if IS_ENABLED(CONFIG_IPV6_SIT)
398         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
399                 pr_info("%s: Disabled Multicast RS\n", dev->name);
400                 ndev->cnf.rtr_solicits = 0;
401         }
402 #endif
403 
404         INIT_LIST_HEAD(&ndev->tempaddr_list);
405         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
406         if ((dev->flags&IFF_LOOPBACK) ||
407             dev->type == ARPHRD_TUNNEL ||
408             dev->type == ARPHRD_TUNNEL6 ||
409             dev->type == ARPHRD_SIT ||
410             dev->type == ARPHRD_NONE) {
411                 ndev->cnf.use_tempaddr = -1;
412         } else {
413                 in6_dev_hold(ndev);
414                 ipv6_regen_rndid((unsigned long) ndev);
415         }
416 
417         ndev->token = in6addr_any;
418 
419         if (netif_running(dev) && addrconf_qdisc_ok(dev))
420                 ndev->if_flags |= IF_READY;
421 
422         ipv6_mc_init_dev(ndev);
423         ndev->tstamp = jiffies;
424         err = addrconf_sysctl_register(ndev);
425         if (err) {
426                 ipv6_mc_destroy_dev(ndev);
427                 del_timer(&ndev->regen_timer);
428                 snmp6_unregister_dev(ndev);
429                 goto err_release;
430         }
431         /* protected by rtnl_lock */
432         rcu_assign_pointer(dev->ip6_ptr, ndev);
433 
434         /* Join interface-local all-node multicast group */
435         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
436 
437         /* Join all-node multicast group */
438         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
439 
440         /* Join all-router multicast group if forwarding is set */
441         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
442                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
443 
444         return ndev;
445 
446 err_release:
447         neigh_parms_release(&nd_tbl, ndev->nd_parms);
448         ndev->dead = 1;
449         in6_dev_finish_destroy(ndev);
450         return ERR_PTR(err);
451 }
452 
453 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
454 {
455         struct inet6_dev *idev;
456 
457         ASSERT_RTNL();
458 
459         idev = __in6_dev_get(dev);
460         if (!idev) {
461                 idev = ipv6_add_dev(dev);
462                 if (IS_ERR(idev))
463                         return NULL;
464         }
465 
466         if (dev->flags&IFF_UP)
467                 ipv6_mc_up(idev);
468         return idev;
469 }
470 
471 static int inet6_netconf_msgsize_devconf(int type)
472 {
473         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
474                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
475         bool all = false;
476 
477         if (type == NETCONFA_ALL)
478                 all = true;
479 
480         if (all || type == NETCONFA_FORWARDING)
481                 size += nla_total_size(4);
482 #ifdef CONFIG_IPV6_MROUTE
483         if (all || type == NETCONFA_MC_FORWARDING)
484                 size += nla_total_size(4);
485 #endif
486         if (all || type == NETCONFA_PROXY_NEIGH)
487                 size += nla_total_size(4);
488 
489         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
490                 size += nla_total_size(4);
491 
492         return size;
493 }
494 
495 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
496                                       struct ipv6_devconf *devconf, u32 portid,
497                                       u32 seq, int event, unsigned int flags,
498                                       int type)
499 {
500         struct nlmsghdr  *nlh;
501         struct netconfmsg *ncm;
502         bool all = false;
503 
504         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
505                         flags);
506         if (!nlh)
507                 return -EMSGSIZE;
508 
509         if (type == NETCONFA_ALL)
510                 all = true;
511 
512         ncm = nlmsg_data(nlh);
513         ncm->ncm_family = AF_INET6;
514 
515         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
516                 goto nla_put_failure;
517 
518         if ((all || type == NETCONFA_FORWARDING) &&
519             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
520                 goto nla_put_failure;
521 #ifdef CONFIG_IPV6_MROUTE
522         if ((all || type == NETCONFA_MC_FORWARDING) &&
523             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
524                         devconf->mc_forwarding) < 0)
525                 goto nla_put_failure;
526 #endif
527         if ((all || type == NETCONFA_PROXY_NEIGH) &&
528             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
529                 goto nla_put_failure;
530 
531         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
532             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
533                         devconf->ignore_routes_with_linkdown) < 0)
534                 goto nla_put_failure;
535 
536         nlmsg_end(skb, nlh);
537         return 0;
538 
539 nla_put_failure:
540         nlmsg_cancel(skb, nlh);
541         return -EMSGSIZE;
542 }
543 
544 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
545                                   struct ipv6_devconf *devconf)
546 {
547         struct sk_buff *skb;
548         int err = -ENOBUFS;
549 
550         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
551         if (!skb)
552                 goto errout;
553 
554         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
555                                          RTM_NEWNETCONF, 0, type);
556         if (err < 0) {
557                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
558                 WARN_ON(err == -EMSGSIZE);
559                 kfree_skb(skb);
560                 goto errout;
561         }
562         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
563         return;
564 errout:
565         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
566 }
567 
568 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
569         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
570         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
571         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
572         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
573 };
574 
575 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
576                                      struct nlmsghdr *nlh)
577 {
578         struct net *net = sock_net(in_skb->sk);
579         struct nlattr *tb[NETCONFA_MAX+1];
580         struct netconfmsg *ncm;
581         struct sk_buff *skb;
582         struct ipv6_devconf *devconf;
583         struct inet6_dev *in6_dev;
584         struct net_device *dev;
585         int ifindex;
586         int err;
587 
588         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
589                           devconf_ipv6_policy);
590         if (err < 0)
591                 goto errout;
592 
593         err = -EINVAL;
594         if (!tb[NETCONFA_IFINDEX])
595                 goto errout;
596 
597         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
598         switch (ifindex) {
599         case NETCONFA_IFINDEX_ALL:
600                 devconf = net->ipv6.devconf_all;
601                 break;
602         case NETCONFA_IFINDEX_DEFAULT:
603                 devconf = net->ipv6.devconf_dflt;
604                 break;
605         default:
606                 dev = __dev_get_by_index(net, ifindex);
607                 if (!dev)
608                         goto errout;
609                 in6_dev = __in6_dev_get(dev);
610                 if (!in6_dev)
611                         goto errout;
612                 devconf = &in6_dev->cnf;
613                 break;
614         }
615 
616         err = -ENOBUFS;
617         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
618         if (!skb)
619                 goto errout;
620 
621         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
622                                          NETLINK_CB(in_skb).portid,
623                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
624                                          NETCONFA_ALL);
625         if (err < 0) {
626                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
627                 WARN_ON(err == -EMSGSIZE);
628                 kfree_skb(skb);
629                 goto errout;
630         }
631         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
632 errout:
633         return err;
634 }
635 
636 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
637                                       struct netlink_callback *cb)
638 {
639         struct net *net = sock_net(skb->sk);
640         int h, s_h;
641         int idx, s_idx;
642         struct net_device *dev;
643         struct inet6_dev *idev;
644         struct hlist_head *head;
645 
646         s_h = cb->args[0];
647         s_idx = idx = cb->args[1];
648 
649         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
650                 idx = 0;
651                 head = &net->dev_index_head[h];
652                 rcu_read_lock();
653                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
654                           net->dev_base_seq;
655                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
656                         if (idx < s_idx)
657                                 goto cont;
658                         idev = __in6_dev_get(dev);
659                         if (!idev)
660                                 goto cont;
661 
662                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
663                                                        &idev->cnf,
664                                                        NETLINK_CB(cb->skb).portid,
665                                                        cb->nlh->nlmsg_seq,
666                                                        RTM_NEWNETCONF,
667                                                        NLM_F_MULTI,
668                                                        NETCONFA_ALL) < 0) {
669                                 rcu_read_unlock();
670                                 goto done;
671                         }
672                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
673 cont:
674                         idx++;
675                 }
676                 rcu_read_unlock();
677         }
678         if (h == NETDEV_HASHENTRIES) {
679                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
680                                                net->ipv6.devconf_all,
681                                                NETLINK_CB(cb->skb).portid,
682                                                cb->nlh->nlmsg_seq,
683                                                RTM_NEWNETCONF, NLM_F_MULTI,
684                                                NETCONFA_ALL) < 0)
685                         goto done;
686                 else
687                         h++;
688         }
689         if (h == NETDEV_HASHENTRIES + 1) {
690                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
691                                                net->ipv6.devconf_dflt,
692                                                NETLINK_CB(cb->skb).portid,
693                                                cb->nlh->nlmsg_seq,
694                                                RTM_NEWNETCONF, NLM_F_MULTI,
695                                                NETCONFA_ALL) < 0)
696                         goto done;
697                 else
698                         h++;
699         }
700 done:
701         cb->args[0] = h;
702         cb->args[1] = idx;
703 
704         return skb->len;
705 }
706 
707 #ifdef CONFIG_SYSCTL
708 static void dev_forward_change(struct inet6_dev *idev)
709 {
710         struct net_device *dev;
711         struct inet6_ifaddr *ifa;
712 
713         if (!idev)
714                 return;
715         dev = idev->dev;
716         if (idev->cnf.forwarding)
717                 dev_disable_lro(dev);
718         if (dev->flags & IFF_MULTICAST) {
719                 if (idev->cnf.forwarding) {
720                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
721                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
722                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
723                 } else {
724                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
725                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
726                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
727                 }
728         }
729 
730         list_for_each_entry(ifa, &idev->addr_list, if_list) {
731                 if (ifa->flags&IFA_F_TENTATIVE)
732                         continue;
733                 if (idev->cnf.forwarding)
734                         addrconf_join_anycast(ifa);
735                 else
736                         addrconf_leave_anycast(ifa);
737         }
738         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
739                                      dev->ifindex, &idev->cnf);
740 }
741 
742 
743 static void addrconf_forward_change(struct net *net, __s32 newf)
744 {
745         struct net_device *dev;
746         struct inet6_dev *idev;
747 
748         for_each_netdev(net, dev) {
749                 idev = __in6_dev_get(dev);
750                 if (idev) {
751                         int changed = (!idev->cnf.forwarding) ^ (!newf);
752                         idev->cnf.forwarding = newf;
753                         if (changed)
754                                 dev_forward_change(idev);
755                 }
756         }
757 }
758 
759 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
760 {
761         struct net *net;
762         int old;
763 
764         if (!rtnl_trylock())
765                 return restart_syscall();
766 
767         net = (struct net *)table->extra2;
768         old = *p;
769         *p = newf;
770 
771         if (p == &net->ipv6.devconf_dflt->forwarding) {
772                 if ((!newf) ^ (!old))
773                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
774                                                      NETCONFA_IFINDEX_DEFAULT,
775                                                      net->ipv6.devconf_dflt);
776                 rtnl_unlock();
777                 return 0;
778         }
779 
780         if (p == &net->ipv6.devconf_all->forwarding) {
781                 net->ipv6.devconf_dflt->forwarding = newf;
782                 addrconf_forward_change(net, newf);
783                 if ((!newf) ^ (!old))
784                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
785                                                      NETCONFA_IFINDEX_ALL,
786                                                      net->ipv6.devconf_all);
787         } else if ((!newf) ^ (!old))
788                 dev_forward_change((struct inet6_dev *)table->extra1);
789         rtnl_unlock();
790 
791         if (newf)
792                 rt6_purge_dflt_routers(net);
793         return 1;
794 }
795 
796 static void addrconf_linkdown_change(struct net *net, __s32 newf)
797 {
798         struct net_device *dev;
799         struct inet6_dev *idev;
800 
801         for_each_netdev(net, dev) {
802                 idev = __in6_dev_get(dev);
803                 if (idev) {
804                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
805 
806                         idev->cnf.ignore_routes_with_linkdown = newf;
807                         if (changed)
808                                 inet6_netconf_notify_devconf(dev_net(dev),
809                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
810                                                              dev->ifindex,
811                                                              &idev->cnf);
812                 }
813         }
814 }
815 
816 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
817 {
818         struct net *net;
819         int old;
820 
821         if (!rtnl_trylock())
822                 return restart_syscall();
823 
824         net = (struct net *)table->extra2;
825         old = *p;
826         *p = newf;
827 
828         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
829                 if ((!newf) ^ (!old))
830                         inet6_netconf_notify_devconf(net,
831                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
832                                                      NETCONFA_IFINDEX_DEFAULT,
833                                                      net->ipv6.devconf_dflt);
834                 rtnl_unlock();
835                 return 0;
836         }
837 
838         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
839                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
840                 addrconf_linkdown_change(net, newf);
841                 if ((!newf) ^ (!old))
842                         inet6_netconf_notify_devconf(net,
843                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
844                                                      NETCONFA_IFINDEX_ALL,
845                                                      net->ipv6.devconf_all);
846         }
847         rtnl_unlock();
848 
849         return 1;
850 }
851 
852 #endif
853 
854 /* Nobody refers to this ifaddr, destroy it */
855 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
856 {
857         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
858 
859 #ifdef NET_REFCNT_DEBUG
860         pr_debug("%s\n", __func__);
861 #endif
862 
863         in6_dev_put(ifp->idev);
864 
865         if (cancel_delayed_work(&ifp->dad_work))
866                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
867                           ifp);
868 
869         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
870                 pr_warn("Freeing alive inet6 address %p\n", ifp);
871                 return;
872         }
873         ip6_rt_put(ifp->rt);
874 
875         kfree_rcu(ifp, rcu);
876 }
877 
878 static void
879 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
880 {
881         struct list_head *p;
882         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
883 
884         /*
885          * Each device address list is sorted in order of scope -
886          * global before linklocal.
887          */
888         list_for_each(p, &idev->addr_list) {
889                 struct inet6_ifaddr *ifa
890                         = list_entry(p, struct inet6_ifaddr, if_list);
891                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
892                         break;
893         }
894 
895         list_add_tail(&ifp->if_list, p);
896 }
897 
898 static u32 inet6_addr_hash(const struct in6_addr *addr)
899 {
900         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
901 }
902 
903 /* On success it returns ifp with increased reference count */
904 
905 static struct inet6_ifaddr *
906 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
907               const struct in6_addr *peer_addr, int pfxlen,
908               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
909 {
910         struct inet6_ifaddr *ifa = NULL;
911         struct rt6_info *rt;
912         unsigned int hash;
913         int err = 0;
914         int addr_type = ipv6_addr_type(addr);
915 
916         if (addr_type == IPV6_ADDR_ANY ||
917             addr_type & IPV6_ADDR_MULTICAST ||
918             (!(idev->dev->flags & IFF_LOOPBACK) &&
919              addr_type & IPV6_ADDR_LOOPBACK))
920                 return ERR_PTR(-EADDRNOTAVAIL);
921 
922         rcu_read_lock_bh();
923         if (idev->dead) {
924                 err = -ENODEV;                  /*XXX*/
925                 goto out2;
926         }
927 
928         if (idev->cnf.disable_ipv6) {
929                 err = -EACCES;
930                 goto out2;
931         }
932 
933         spin_lock(&addrconf_hash_lock);
934 
935         /* Ignore adding duplicate addresses on an interface */
936         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
937                 ADBG("ipv6_add_addr: already assigned\n");
938                 err = -EEXIST;
939                 goto out;
940         }
941 
942         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
943 
944         if (!ifa) {
945                 ADBG("ipv6_add_addr: malloc failed\n");
946                 err = -ENOBUFS;
947                 goto out;
948         }
949 
950         rt = addrconf_dst_alloc(idev, addr, false);
951         if (IS_ERR(rt)) {
952                 err = PTR_ERR(rt);
953                 goto out;
954         }
955 
956         neigh_parms_data_state_setall(idev->nd_parms);
957 
958         ifa->addr = *addr;
959         if (peer_addr)
960                 ifa->peer_addr = *peer_addr;
961 
962         spin_lock_init(&ifa->lock);
963         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
964         INIT_HLIST_NODE(&ifa->addr_lst);
965         ifa->scope = scope;
966         ifa->prefix_len = pfxlen;
967         ifa->flags = flags | IFA_F_TENTATIVE;
968         ifa->valid_lft = valid_lft;
969         ifa->prefered_lft = prefered_lft;
970         ifa->cstamp = ifa->tstamp = jiffies;
971         ifa->tokenized = false;
972 
973         ifa->rt = rt;
974 
975         ifa->idev = idev;
976         in6_dev_hold(idev);
977         /* For caller */
978         in6_ifa_hold(ifa);
979 
980         /* Add to big hash table */
981         hash = inet6_addr_hash(addr);
982 
983         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
984         spin_unlock(&addrconf_hash_lock);
985 
986         write_lock(&idev->lock);
987         /* Add to inet6_dev unicast addr list. */
988         ipv6_link_dev_addr(idev, ifa);
989 
990         if (ifa->flags&IFA_F_TEMPORARY) {
991                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
992                 in6_ifa_hold(ifa);
993         }
994 
995         in6_ifa_hold(ifa);
996         write_unlock(&idev->lock);
997 out2:
998         rcu_read_unlock_bh();
999 
1000         if (likely(err == 0))
1001                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1002         else {
1003                 kfree(ifa);
1004                 ifa = ERR_PTR(err);
1005         }
1006 
1007         return ifa;
1008 out:
1009         spin_unlock(&addrconf_hash_lock);
1010         goto out2;
1011 }
1012 
1013 enum cleanup_prefix_rt_t {
1014         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1015         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1016         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1017 };
1018 
1019 /*
1020  * Check, whether the prefix for ifp would still need a prefix route
1021  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1022  * constants.
1023  *
1024  * 1) we don't purge prefix if address was not permanent.
1025  *    prefix is managed by its own lifetime.
1026  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1027  * 3) if there are no addresses, delete prefix.
1028  * 4) if there are still other permanent address(es),
1029  *    corresponding prefix is still permanent.
1030  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1031  *    don't purge the prefix, assume user space is managing it.
1032  * 6) otherwise, update prefix lifetime to the
1033  *    longest valid lifetime among the corresponding
1034  *    addresses on the device.
1035  *    Note: subsequent RA will update lifetime.
1036  **/
1037 static enum cleanup_prefix_rt_t
1038 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1039 {
1040         struct inet6_ifaddr *ifa;
1041         struct inet6_dev *idev = ifp->idev;
1042         unsigned long lifetime;
1043         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1044 
1045         *expires = jiffies;
1046 
1047         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1048                 if (ifa == ifp)
1049                         continue;
1050                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1051                                        ifp->prefix_len))
1052                         continue;
1053                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1054                         return CLEANUP_PREFIX_RT_NOP;
1055 
1056                 action = CLEANUP_PREFIX_RT_EXPIRE;
1057 
1058                 spin_lock(&ifa->lock);
1059 
1060                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1061                 /*
1062                  * Note: Because this address is
1063                  * not permanent, lifetime <
1064                  * LONG_MAX / HZ here.
1065                  */
1066                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1067                         *expires = ifa->tstamp + lifetime * HZ;
1068                 spin_unlock(&ifa->lock);
1069         }
1070 
1071         return action;
1072 }
1073 
1074 static void
1075 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1076 {
1077         struct rt6_info *rt;
1078 
1079         rt = addrconf_get_prefix_route(&ifp->addr,
1080                                        ifp->prefix_len,
1081                                        ifp->idev->dev,
1082                                        0, RTF_GATEWAY | RTF_DEFAULT);
1083         if (rt) {
1084                 if (del_rt)
1085                         ip6_del_rt(rt);
1086                 else {
1087                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1088                                 rt6_set_expires(rt, expires);
1089                         ip6_rt_put(rt);
1090                 }
1091         }
1092 }
1093 
1094 
1095 /* This function wants to get referenced ifp and releases it before return */
1096 
1097 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1098 {
1099         int state;
1100         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1101         unsigned long expires;
1102 
1103         ASSERT_RTNL();
1104 
1105         spin_lock_bh(&ifp->lock);
1106         state = ifp->state;
1107         ifp->state = INET6_IFADDR_STATE_DEAD;
1108         spin_unlock_bh(&ifp->lock);
1109 
1110         if (state == INET6_IFADDR_STATE_DEAD)
1111                 goto out;
1112 
1113         spin_lock_bh(&addrconf_hash_lock);
1114         hlist_del_init_rcu(&ifp->addr_lst);
1115         spin_unlock_bh(&addrconf_hash_lock);
1116 
1117         write_lock_bh(&ifp->idev->lock);
1118 
1119         if (ifp->flags&IFA_F_TEMPORARY) {
1120                 list_del(&ifp->tmp_list);
1121                 if (ifp->ifpub) {
1122                         in6_ifa_put(ifp->ifpub);
1123                         ifp->ifpub = NULL;
1124                 }
1125                 __in6_ifa_put(ifp);
1126         }
1127 
1128         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1129                 action = check_cleanup_prefix_route(ifp, &expires);
1130 
1131         list_del_init(&ifp->if_list);
1132         __in6_ifa_put(ifp);
1133 
1134         write_unlock_bh(&ifp->idev->lock);
1135 
1136         addrconf_del_dad_work(ifp);
1137 
1138         ipv6_ifa_notify(RTM_DELADDR, ifp);
1139 
1140         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1141 
1142         if (action != CLEANUP_PREFIX_RT_NOP) {
1143                 cleanup_prefix_route(ifp, expires,
1144                         action == CLEANUP_PREFIX_RT_DEL);
1145         }
1146 
1147         /* clean up prefsrc entries */
1148         rt6_remove_prefsrc(ifp);
1149 out:
1150         in6_ifa_put(ifp);
1151 }
1152 
1153 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1154 {
1155         struct inet6_dev *idev = ifp->idev;
1156         struct in6_addr addr, *tmpaddr;
1157         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1158         unsigned long regen_advance;
1159         int tmp_plen;
1160         int ret = 0;
1161         u32 addr_flags;
1162         unsigned long now = jiffies;
1163 
1164         write_lock_bh(&idev->lock);
1165         if (ift) {
1166                 spin_lock_bh(&ift->lock);
1167                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1168                 spin_unlock_bh(&ift->lock);
1169                 tmpaddr = &addr;
1170         } else {
1171                 tmpaddr = NULL;
1172         }
1173 retry:
1174         in6_dev_hold(idev);
1175         if (idev->cnf.use_tempaddr <= 0) {
1176                 write_unlock_bh(&idev->lock);
1177                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1178                 in6_dev_put(idev);
1179                 ret = -1;
1180                 goto out;
1181         }
1182         spin_lock_bh(&ifp->lock);
1183         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1184                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1185                 spin_unlock_bh(&ifp->lock);
1186                 write_unlock_bh(&idev->lock);
1187                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1188                         __func__);
1189                 in6_dev_put(idev);
1190                 ret = -1;
1191                 goto out;
1192         }
1193         in6_ifa_hold(ifp);
1194         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1195         __ipv6_try_regen_rndid(idev, tmpaddr);
1196         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1197         age = (now - ifp->tstamp) / HZ;
1198         tmp_valid_lft = min_t(__u32,
1199                               ifp->valid_lft,
1200                               idev->cnf.temp_valid_lft + age);
1201         tmp_prefered_lft = min_t(__u32,
1202                                  ifp->prefered_lft,
1203                                  idev->cnf.temp_prefered_lft + age -
1204                                  idev->cnf.max_desync_factor);
1205         tmp_plen = ifp->prefix_len;
1206         tmp_tstamp = ifp->tstamp;
1207         spin_unlock_bh(&ifp->lock);
1208 
1209         regen_advance = idev->cnf.regen_max_retry *
1210                         idev->cnf.dad_transmits *
1211                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1212         write_unlock_bh(&idev->lock);
1213 
1214         /* A temporary address is created only if this calculated Preferred
1215          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1216          * an implementation must not create a temporary address with a zero
1217          * Preferred Lifetime.
1218          * Use age calculation as in addrconf_verify to avoid unnecessary
1219          * temporary addresses being generated.
1220          */
1221         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1222         if (tmp_prefered_lft <= regen_advance + age) {
1223                 in6_ifa_put(ifp);
1224                 in6_dev_put(idev);
1225                 ret = -1;
1226                 goto out;
1227         }
1228 
1229         addr_flags = IFA_F_TEMPORARY;
1230         /* set in addrconf_prefix_rcv() */
1231         if (ifp->flags & IFA_F_OPTIMISTIC)
1232                 addr_flags |= IFA_F_OPTIMISTIC;
1233 
1234         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1235                             ipv6_addr_scope(&addr), addr_flags,
1236                             tmp_valid_lft, tmp_prefered_lft);
1237         if (IS_ERR(ift)) {
1238                 in6_ifa_put(ifp);
1239                 in6_dev_put(idev);
1240                 pr_info("%s: retry temporary address regeneration\n", __func__);
1241                 tmpaddr = &addr;
1242                 write_lock_bh(&idev->lock);
1243                 goto retry;
1244         }
1245 
1246         spin_lock_bh(&ift->lock);
1247         ift->ifpub = ifp;
1248         ift->cstamp = now;
1249         ift->tstamp = tmp_tstamp;
1250         spin_unlock_bh(&ift->lock);
1251 
1252         addrconf_dad_start(ift);
1253         in6_ifa_put(ift);
1254         in6_dev_put(idev);
1255 out:
1256         return ret;
1257 }
1258 
1259 /*
1260  *      Choose an appropriate source address (RFC3484)
1261  */
1262 enum {
1263         IPV6_SADDR_RULE_INIT = 0,
1264         IPV6_SADDR_RULE_LOCAL,
1265         IPV6_SADDR_RULE_SCOPE,
1266         IPV6_SADDR_RULE_PREFERRED,
1267 #ifdef CONFIG_IPV6_MIP6
1268         IPV6_SADDR_RULE_HOA,
1269 #endif
1270         IPV6_SADDR_RULE_OIF,
1271         IPV6_SADDR_RULE_LABEL,
1272         IPV6_SADDR_RULE_PRIVACY,
1273         IPV6_SADDR_RULE_ORCHID,
1274         IPV6_SADDR_RULE_PREFIX,
1275 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1276         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1277 #endif
1278         IPV6_SADDR_RULE_MAX
1279 };
1280 
1281 struct ipv6_saddr_score {
1282         int                     rule;
1283         int                     addr_type;
1284         struct inet6_ifaddr     *ifa;
1285         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1286         int                     scopedist;
1287         int                     matchlen;
1288 };
1289 
1290 struct ipv6_saddr_dst {
1291         const struct in6_addr *addr;
1292         int ifindex;
1293         int scope;
1294         int label;
1295         unsigned int prefs;
1296 };
1297 
1298 static inline int ipv6_saddr_preferred(int type)
1299 {
1300         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1301                 return 1;
1302         return 0;
1303 }
1304 
1305 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1306 {
1307 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1308         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1309 #else
1310         return false;
1311 #endif
1312 }
1313 
1314 static int ipv6_get_saddr_eval(struct net *net,
1315                                struct ipv6_saddr_score *score,
1316                                struct ipv6_saddr_dst *dst,
1317                                int i)
1318 {
1319         int ret;
1320 
1321         if (i <= score->rule) {
1322                 switch (i) {
1323                 case IPV6_SADDR_RULE_SCOPE:
1324                         ret = score->scopedist;
1325                         break;
1326                 case IPV6_SADDR_RULE_PREFIX:
1327                         ret = score->matchlen;
1328                         break;
1329                 default:
1330                         ret = !!test_bit(i, score->scorebits);
1331                 }
1332                 goto out;
1333         }
1334 
1335         switch (i) {
1336         case IPV6_SADDR_RULE_INIT:
1337                 /* Rule 0: remember if hiscore is not ready yet */
1338                 ret = !!score->ifa;
1339                 break;
1340         case IPV6_SADDR_RULE_LOCAL:
1341                 /* Rule 1: Prefer same address */
1342                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1343                 break;
1344         case IPV6_SADDR_RULE_SCOPE:
1345                 /* Rule 2: Prefer appropriate scope
1346                  *
1347                  *      ret
1348                  *       ^
1349                  *    -1 |  d 15
1350                  *    ---+--+-+---> scope
1351                  *       |
1352                  *       |             d is scope of the destination.
1353                  *  B-d  |  \
1354                  *       |   \      <- smaller scope is better if
1355                  *  B-15 |    \        if scope is enough for destination.
1356                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1357                  * d-C-1 | /
1358                  *       |/         <- greater is better
1359                  *   -C  /             if scope is not enough for destination.
1360                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1361                  *
1362                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1363                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1364                  * Assume B = 0 and we get C > 29.
1365                  */
1366                 ret = __ipv6_addr_src_scope(score->addr_type);
1367                 if (ret >= dst->scope)
1368                         ret = -ret;
1369                 else
1370                         ret -= 128;     /* 30 is enough */
1371                 score->scopedist = ret;
1372                 break;
1373         case IPV6_SADDR_RULE_PREFERRED:
1374             {
1375                 /* Rule 3: Avoid deprecated and optimistic addresses */
1376                 u8 avoid = IFA_F_DEPRECATED;
1377 
1378                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1379                         avoid |= IFA_F_OPTIMISTIC;
1380                 ret = ipv6_saddr_preferred(score->addr_type) ||
1381                       !(score->ifa->flags & avoid);
1382                 break;
1383             }
1384 #ifdef CONFIG_IPV6_MIP6
1385         case IPV6_SADDR_RULE_HOA:
1386             {
1387                 /* Rule 4: Prefer home address */
1388                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1389                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1390                 break;
1391             }
1392 #endif
1393         case IPV6_SADDR_RULE_OIF:
1394                 /* Rule 5: Prefer outgoing interface */
1395                 ret = (!dst->ifindex ||
1396                        dst->ifindex == score->ifa->idev->dev->ifindex);
1397                 break;
1398         case IPV6_SADDR_RULE_LABEL:
1399                 /* Rule 6: Prefer matching label */
1400                 ret = ipv6_addr_label(net,
1401                                       &score->ifa->addr, score->addr_type,
1402                                       score->ifa->idev->dev->ifindex) == dst->label;
1403                 break;
1404         case IPV6_SADDR_RULE_PRIVACY:
1405             {
1406                 /* Rule 7: Prefer public address
1407                  * Note: prefer temporary address if use_tempaddr >= 2
1408                  */
1409                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1410                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1411                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1412                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1413                 break;
1414             }
1415         case IPV6_SADDR_RULE_ORCHID:
1416                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1417                  *          non-ORCHID vs non-ORCHID
1418                  */
1419                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1420                         ipv6_addr_orchid(dst->addr));
1421                 break;
1422         case IPV6_SADDR_RULE_PREFIX:
1423                 /* Rule 8: Use longest matching prefix */
1424                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1425                 if (ret > score->ifa->prefix_len)
1426                         ret = score->ifa->prefix_len;
1427                 score->matchlen = ret;
1428                 break;
1429 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1430         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1431                 /* Optimistic addresses still have lower precedence than other
1432                  * preferred addresses.
1433                  */
1434                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1435                 break;
1436 #endif
1437         default:
1438                 ret = 0;
1439         }
1440 
1441         if (ret)
1442                 __set_bit(i, score->scorebits);
1443         score->rule = i;
1444 out:
1445         return ret;
1446 }
1447 
1448 static int __ipv6_dev_get_saddr(struct net *net,
1449                                 struct ipv6_saddr_dst *dst,
1450                                 struct inet6_dev *idev,
1451                                 struct ipv6_saddr_score *scores,
1452                                 int hiscore_idx)
1453 {
1454         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1455 
1456         read_lock_bh(&idev->lock);
1457         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1458                 int i;
1459 
1460                 /*
1461                  * - Tentative Address (RFC2462 section 5.4)
1462                  *  - A tentative address is not considered
1463                  *    "assigned to an interface" in the traditional
1464                  *    sense, unless it is also flagged as optimistic.
1465                  * - Candidate Source Address (section 4)
1466                  *  - In any case, anycast addresses, multicast
1467                  *    addresses, and the unspecified address MUST
1468                  *    NOT be included in a candidate set.
1469                  */
1470                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1471                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1472                         continue;
1473 
1474                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1475 
1476                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1477                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1478                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1479                                             idev->dev->name);
1480                         continue;
1481                 }
1482 
1483                 score->rule = -1;
1484                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1485 
1486                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1487                         int minihiscore, miniscore;
1488 
1489                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1490                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1491 
1492                         if (minihiscore > miniscore) {
1493                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1494                                     score->scopedist > 0) {
1495                                         /*
1496                                          * special case:
1497                                          * each remaining entry
1498                                          * has too small (not enough)
1499                                          * scope, because ifa entries
1500                                          * are sorted by their scope
1501                                          * values.
1502                                          */
1503                                         goto out;
1504                                 }
1505                                 break;
1506                         } else if (minihiscore < miniscore) {
1507                                 if (hiscore->ifa)
1508                                         in6_ifa_put(hiscore->ifa);
1509 
1510                                 in6_ifa_hold(score->ifa);
1511 
1512                                 swap(hiscore, score);
1513                                 hiscore_idx = 1 - hiscore_idx;
1514 
1515                                 /* restore our iterator */
1516                                 score->ifa = hiscore->ifa;
1517 
1518                                 break;
1519                         }
1520                 }
1521         }
1522 out:
1523         read_unlock_bh(&idev->lock);
1524         return hiscore_idx;
1525 }
1526 
1527 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1528                        const struct in6_addr *daddr, unsigned int prefs,
1529                        struct in6_addr *saddr)
1530 {
1531         struct ipv6_saddr_score scores[2], *hiscore;
1532         struct ipv6_saddr_dst dst;
1533         struct inet6_dev *idev;
1534         struct net_device *dev;
1535         int dst_type;
1536         bool use_oif_addr = false;
1537         int hiscore_idx = 0;
1538 
1539         dst_type = __ipv6_addr_type(daddr);
1540         dst.addr = daddr;
1541         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1542         dst.scope = __ipv6_addr_src_scope(dst_type);
1543         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1544         dst.prefs = prefs;
1545 
1546         scores[hiscore_idx].rule = -1;
1547         scores[hiscore_idx].ifa = NULL;
1548 
1549         rcu_read_lock();
1550 
1551         /* Candidate Source Address (section 4)
1552          *  - multicast and link-local destination address,
1553          *    the set of candidate source address MUST only
1554          *    include addresses assigned to interfaces
1555          *    belonging to the same link as the outgoing
1556          *    interface.
1557          * (- For site-local destination addresses, the
1558          *    set of candidate source addresses MUST only
1559          *    include addresses assigned to interfaces
1560          *    belonging to the same site as the outgoing
1561          *    interface.)
1562          *  - "It is RECOMMENDED that the candidate source addresses
1563          *    be the set of unicast addresses assigned to the
1564          *    interface that will be used to send to the destination
1565          *    (the 'outgoing' interface)." (RFC 6724)
1566          */
1567         if (dst_dev) {
1568                 idev = __in6_dev_get(dst_dev);
1569                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1570                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1571                     (idev && idev->cnf.use_oif_addrs_only)) {
1572                         use_oif_addr = true;
1573                 }
1574         }
1575 
1576         if (use_oif_addr) {
1577                 if (idev)
1578                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1579         } else {
1580                 for_each_netdev_rcu(net, dev) {
1581                         idev = __in6_dev_get(dev);
1582                         if (!idev)
1583                                 continue;
1584                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1585                 }
1586         }
1587         rcu_read_unlock();
1588 
1589         hiscore = &scores[hiscore_idx];
1590         if (!hiscore->ifa)
1591                 return -EADDRNOTAVAIL;
1592 
1593         *saddr = hiscore->ifa->addr;
1594         in6_ifa_put(hiscore->ifa);
1595         return 0;
1596 }
1597 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1598 
1599 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1600                       u32 banned_flags)
1601 {
1602         struct inet6_ifaddr *ifp;
1603         int err = -EADDRNOTAVAIL;
1604 
1605         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1606                 if (ifp->scope > IFA_LINK)
1607                         break;
1608                 if (ifp->scope == IFA_LINK &&
1609                     !(ifp->flags & banned_flags)) {
1610                         *addr = ifp->addr;
1611                         err = 0;
1612                         break;
1613                 }
1614         }
1615         return err;
1616 }
1617 
1618 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1619                     u32 banned_flags)
1620 {
1621         struct inet6_dev *idev;
1622         int err = -EADDRNOTAVAIL;
1623 
1624         rcu_read_lock();
1625         idev = __in6_dev_get(dev);
1626         if (idev) {
1627                 read_lock_bh(&idev->lock);
1628                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1629                 read_unlock_bh(&idev->lock);
1630         }
1631         rcu_read_unlock();
1632         return err;
1633 }
1634 
1635 static int ipv6_count_addresses(struct inet6_dev *idev)
1636 {
1637         int cnt = 0;
1638         struct inet6_ifaddr *ifp;
1639 
1640         read_lock_bh(&idev->lock);
1641         list_for_each_entry(ifp, &idev->addr_list, if_list)
1642                 cnt++;
1643         read_unlock_bh(&idev->lock);
1644         return cnt;
1645 }
1646 
1647 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1648                   const struct net_device *dev, int strict)
1649 {
1650         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1651 }
1652 EXPORT_SYMBOL(ipv6_chk_addr);
1653 
1654 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1655                             const struct net_device *dev, int strict,
1656                             u32 banned_flags)
1657 {
1658         struct inet6_ifaddr *ifp;
1659         unsigned int hash = inet6_addr_hash(addr);
1660         u32 ifp_flags;
1661 
1662         rcu_read_lock_bh();
1663         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1664                 if (!net_eq(dev_net(ifp->idev->dev), net))
1665                         continue;
1666                 /* Decouple optimistic from tentative for evaluation here.
1667                  * Ban optimistic addresses explicitly, when required.
1668                  */
1669                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1670                             ? (ifp->flags&~IFA_F_TENTATIVE)
1671                             : ifp->flags;
1672                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1673                     !(ifp_flags&banned_flags) &&
1674                     (!dev || ifp->idev->dev == dev ||
1675                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1676                         rcu_read_unlock_bh();
1677                         return 1;
1678                 }
1679         }
1680 
1681         rcu_read_unlock_bh();
1682         return 0;
1683 }
1684 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1685 
1686 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1687                                struct net_device *dev)
1688 {
1689         unsigned int hash = inet6_addr_hash(addr);
1690         struct inet6_ifaddr *ifp;
1691 
1692         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1693                 if (!net_eq(dev_net(ifp->idev->dev), net))
1694                         continue;
1695                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1696                         if (!dev || ifp->idev->dev == dev)
1697                                 return true;
1698                 }
1699         }
1700         return false;
1701 }
1702 
1703 /* Compares an address/prefix_len with addresses on device @dev.
1704  * If one is found it returns true.
1705  */
1706 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1707         const unsigned int prefix_len, struct net_device *dev)
1708 {
1709         struct inet6_dev *idev;
1710         struct inet6_ifaddr *ifa;
1711         bool ret = false;
1712 
1713         rcu_read_lock();
1714         idev = __in6_dev_get(dev);
1715         if (idev) {
1716                 read_lock_bh(&idev->lock);
1717                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1718                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1719                         if (ret)
1720                                 break;
1721                 }
1722                 read_unlock_bh(&idev->lock);
1723         }
1724         rcu_read_unlock();
1725 
1726         return ret;
1727 }
1728 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1729 
1730 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1731 {
1732         struct inet6_dev *idev;
1733         struct inet6_ifaddr *ifa;
1734         int     onlink;
1735 
1736         onlink = 0;
1737         rcu_read_lock();
1738         idev = __in6_dev_get(dev);
1739         if (idev) {
1740                 read_lock_bh(&idev->lock);
1741                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1742                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1743                                                    ifa->prefix_len);
1744                         if (onlink)
1745                                 break;
1746                 }
1747                 read_unlock_bh(&idev->lock);
1748         }
1749         rcu_read_unlock();
1750         return onlink;
1751 }
1752 EXPORT_SYMBOL(ipv6_chk_prefix);
1753 
1754 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1755                                      struct net_device *dev, int strict)
1756 {
1757         struct inet6_ifaddr *ifp, *result = NULL;
1758         unsigned int hash = inet6_addr_hash(addr);
1759 
1760         rcu_read_lock_bh();
1761         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1762                 if (!net_eq(dev_net(ifp->idev->dev), net))
1763                         continue;
1764                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1765                         if (!dev || ifp->idev->dev == dev ||
1766                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1767                                 result = ifp;
1768                                 in6_ifa_hold(ifp);
1769                                 break;
1770                         }
1771                 }
1772         }
1773         rcu_read_unlock_bh();
1774 
1775         return result;
1776 }
1777 
1778 /* Gets referenced address, destroys ifaddr */
1779 
1780 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1781 {
1782         if (dad_failed)
1783                 ifp->flags |= IFA_F_DADFAILED;
1784 
1785         if (ifp->flags&IFA_F_PERMANENT) {
1786                 spin_lock_bh(&ifp->lock);
1787                 addrconf_del_dad_work(ifp);
1788                 ifp->flags |= IFA_F_TENTATIVE;
1789                 spin_unlock_bh(&ifp->lock);
1790                 if (dad_failed)
1791                         ipv6_ifa_notify(0, ifp);
1792                 in6_ifa_put(ifp);
1793         } else if (ifp->flags&IFA_F_TEMPORARY) {
1794                 struct inet6_ifaddr *ifpub;
1795                 spin_lock_bh(&ifp->lock);
1796                 ifpub = ifp->ifpub;
1797                 if (ifpub) {
1798                         in6_ifa_hold(ifpub);
1799                         spin_unlock_bh(&ifp->lock);
1800                         ipv6_create_tempaddr(ifpub, ifp);
1801                         in6_ifa_put(ifpub);
1802                 } else {
1803                         spin_unlock_bh(&ifp->lock);
1804                 }
1805                 ipv6_del_addr(ifp);
1806         } else {
1807                 ipv6_del_addr(ifp);
1808         }
1809 }
1810 
1811 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1812 {
1813         int err = -ENOENT;
1814 
1815         spin_lock_bh(&ifp->lock);
1816         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1817                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1818                 err = 0;
1819         }
1820         spin_unlock_bh(&ifp->lock);
1821 
1822         return err;
1823 }
1824 
1825 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1826 {
1827         struct in6_addr addr;
1828         struct inet6_dev *idev = ifp->idev;
1829         struct net *net = dev_net(ifp->idev->dev);
1830 
1831         if (addrconf_dad_end(ifp)) {
1832                 in6_ifa_put(ifp);
1833                 return;
1834         }
1835 
1836         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1837                              ifp->idev->dev->name, &ifp->addr);
1838 
1839         spin_lock_bh(&ifp->lock);
1840 
1841         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1842                 int scope = ifp->scope;
1843                 u32 flags = ifp->flags;
1844                 struct in6_addr new_addr;
1845                 struct inet6_ifaddr *ifp2;
1846                 u32 valid_lft, preferred_lft;
1847                 int pfxlen = ifp->prefix_len;
1848                 int retries = ifp->stable_privacy_retry + 1;
1849 
1850                 if (retries > net->ipv6.sysctl.idgen_retries) {
1851                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1852                                              ifp->idev->dev->name);
1853                         goto errdad;
1854                 }
1855 
1856                 new_addr = ifp->addr;
1857                 if (ipv6_generate_stable_address(&new_addr, retries,
1858                                                  idev))
1859                         goto errdad;
1860 
1861                 valid_lft = ifp->valid_lft;
1862                 preferred_lft = ifp->prefered_lft;
1863 
1864                 spin_unlock_bh(&ifp->lock);
1865 
1866                 if (idev->cnf.max_addresses &&
1867                     ipv6_count_addresses(idev) >=
1868                     idev->cnf.max_addresses)
1869                         goto lock_errdad;
1870 
1871                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1872                                      ifp->idev->dev->name);
1873 
1874                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1875                                      scope, flags, valid_lft,
1876                                      preferred_lft);
1877                 if (IS_ERR(ifp2))
1878                         goto lock_errdad;
1879 
1880                 spin_lock_bh(&ifp2->lock);
1881                 ifp2->stable_privacy_retry = retries;
1882                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1883                 spin_unlock_bh(&ifp2->lock);
1884 
1885                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1886                 in6_ifa_put(ifp2);
1887 lock_errdad:
1888                 spin_lock_bh(&ifp->lock);
1889         } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1890                 addr.s6_addr32[0] = htonl(0xfe800000);
1891                 addr.s6_addr32[1] = 0;
1892 
1893                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1894                     ipv6_addr_equal(&ifp->addr, &addr)) {
1895                         /* DAD failed for link-local based on MAC address */
1896                         idev->cnf.disable_ipv6 = 1;
1897 
1898                         pr_info("%s: IPv6 being disabled!\n",
1899                                 ifp->idev->dev->name);
1900                 }
1901         }
1902 
1903 errdad:
1904         /* transition from _POSTDAD to _ERRDAD */
1905         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1906         spin_unlock_bh(&ifp->lock);
1907 
1908         addrconf_mod_dad_work(ifp, 0);
1909         in6_ifa_put(ifp);
1910 }
1911 
1912 /* Join to solicited addr multicast group.
1913  * caller must hold RTNL */
1914 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1915 {
1916         struct in6_addr maddr;
1917 
1918         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1919                 return;
1920 
1921         addrconf_addr_solict_mult(addr, &maddr);
1922         ipv6_dev_mc_inc(dev, &maddr);
1923 }
1924 
1925 /* caller must hold RTNL */
1926 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1927 {
1928         struct in6_addr maddr;
1929 
1930         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1931                 return;
1932 
1933         addrconf_addr_solict_mult(addr, &maddr);
1934         __ipv6_dev_mc_dec(idev, &maddr);
1935 }
1936 
1937 /* caller must hold RTNL */
1938 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1939 {
1940         struct in6_addr addr;
1941 
1942         if (ifp->prefix_len >= 127) /* RFC 6164 */
1943                 return;
1944         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1945         if (ipv6_addr_any(&addr))
1946                 return;
1947         __ipv6_dev_ac_inc(ifp->idev, &addr);
1948 }
1949 
1950 /* caller must hold RTNL */
1951 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1952 {
1953         struct in6_addr addr;
1954 
1955         if (ifp->prefix_len >= 127) /* RFC 6164 */
1956                 return;
1957         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1958         if (ipv6_addr_any(&addr))
1959                 return;
1960         __ipv6_dev_ac_dec(ifp->idev, &addr);
1961 }
1962 
1963 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1964 {
1965         if (dev->addr_len != EUI64_ADDR_LEN)
1966                 return -1;
1967         memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
1968         eui[0] ^= 2;
1969         return 0;
1970 }
1971 
1972 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1973 {
1974         union fwnet_hwaddr *ha;
1975 
1976         if (dev->addr_len != FWNET_ALEN)
1977                 return -1;
1978 
1979         ha = (union fwnet_hwaddr *)dev->dev_addr;
1980 
1981         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1982         eui[0] ^= 2;
1983         return 0;
1984 }
1985 
1986 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1987 {
1988         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1989         if (dev->addr_len != ARCNET_ALEN)
1990                 return -1;
1991         memset(eui, 0, 7);
1992         eui[7] = *(u8 *)dev->dev_addr;
1993         return 0;
1994 }
1995 
1996 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1997 {
1998         if (dev->addr_len != INFINIBAND_ALEN)
1999                 return -1;
2000         memcpy(eui, dev->dev_addr + 12, 8);
2001         eui[0] |= 2;
2002         return 0;
2003 }
2004 
2005 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2006 {
2007         if (addr == 0)
2008                 return -1;
2009         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2010                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2011                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2012                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2013                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2014                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2015         eui[1] = 0;
2016         eui[2] = 0x5E;
2017         eui[3] = 0xFE;
2018         memcpy(eui + 4, &addr, 4);
2019         return 0;
2020 }
2021 
2022 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2023 {
2024         if (dev->priv_flags & IFF_ISATAP)
2025                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2026         return -1;
2027 }
2028 
2029 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2030 {
2031         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2032 }
2033 
2034 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2035 {
2036         memcpy(eui, dev->perm_addr, 3);
2037         memcpy(eui + 5, dev->perm_addr + 3, 3);
2038         eui[3] = 0xFF;
2039         eui[4] = 0xFE;
2040         eui[0] ^= 2;
2041         return 0;
2042 }
2043 
2044 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2045 {
2046         switch (dev->type) {
2047         case ARPHRD_ETHER:
2048         case ARPHRD_FDDI:
2049                 return addrconf_ifid_eui48(eui, dev);
2050         case ARPHRD_ARCNET:
2051                 return addrconf_ifid_arcnet(eui, dev);
2052         case ARPHRD_INFINIBAND:
2053                 return addrconf_ifid_infiniband(eui, dev);
2054         case ARPHRD_SIT:
2055                 return addrconf_ifid_sit(eui, dev);
2056         case ARPHRD_IPGRE:
2057                 return addrconf_ifid_gre(eui, dev);
2058         case ARPHRD_6LOWPAN:
2059                 return addrconf_ifid_eui64(eui, dev);
2060         case ARPHRD_IEEE1394:
2061                 return addrconf_ifid_ieee1394(eui, dev);
2062         case ARPHRD_TUNNEL6:
2063                 return addrconf_ifid_ip6tnl(eui, dev);
2064         }
2065         return -1;
2066 }
2067 
2068 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2069 {
2070         int err = -1;
2071         struct inet6_ifaddr *ifp;
2072 
2073         read_lock_bh(&idev->lock);
2074         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2075                 if (ifp->scope > IFA_LINK)
2076                         break;
2077                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2078                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2079                         err = 0;
2080                         break;
2081                 }
2082         }
2083         read_unlock_bh(&idev->lock);
2084         return err;
2085 }
2086 
2087 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2088 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2089 {
2090 regen:
2091         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2092         idev->rndid[0] &= ~0x02;
2093 
2094         /*
2095          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2096          * check if generated address is not inappropriate
2097          *
2098          *  - Reserved subnet anycast (RFC 2526)
2099          *      11111101 11....11 1xxxxxxx
2100          *  - ISATAP (RFC4214) 6.1
2101          *      00-00-5E-FE-xx-xx-xx-xx
2102          *  - value 0
2103          *  - XXX: already assigned to an address on the device
2104          */
2105         if (idev->rndid[0] == 0xfd &&
2106             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2107             (idev->rndid[7]&0x80))
2108                 goto regen;
2109         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2110                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2111                         goto regen;
2112                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2113                         goto regen;
2114         }
2115 }
2116 
2117 static void ipv6_regen_rndid(unsigned long data)
2118 {
2119         struct inet6_dev *idev = (struct inet6_dev *) data;
2120         unsigned long expires;
2121 
2122         rcu_read_lock_bh();
2123         write_lock_bh(&idev->lock);
2124 
2125         if (idev->dead)
2126                 goto out;
2127 
2128         __ipv6_regen_rndid(idev);
2129 
2130         expires = jiffies +
2131                 idev->cnf.temp_prefered_lft * HZ -
2132                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2133                 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2134                 idev->cnf.max_desync_factor * HZ;
2135         if (time_before(expires, jiffies)) {
2136                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2137                         __func__, idev->dev->name);
2138                 goto out;
2139         }
2140 
2141         if (!mod_timer(&idev->regen_timer, expires))
2142                 in6_dev_hold(idev);
2143 
2144 out:
2145         write_unlock_bh(&idev->lock);
2146         rcu_read_unlock_bh();
2147         in6_dev_put(idev);
2148 }
2149 
2150 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2151 {
2152         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2153                 __ipv6_regen_rndid(idev);
2154 }
2155 
2156 /*
2157  *      Add prefix route.
2158  */
2159 
2160 static void
2161 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2162                       unsigned long expires, u32 flags)
2163 {
2164         struct fib6_config cfg = {
2165                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2166                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2167                 .fc_ifindex = dev->ifindex,
2168                 .fc_expires = expires,
2169                 .fc_dst_len = plen,
2170                 .fc_flags = RTF_UP | flags,
2171                 .fc_nlinfo.nl_net = dev_net(dev),
2172                 .fc_protocol = RTPROT_KERNEL,
2173         };
2174 
2175         cfg.fc_dst = *pfx;
2176 
2177         /* Prevent useless cloning on PtP SIT.
2178            This thing is done here expecting that the whole
2179            class of non-broadcast devices need not cloning.
2180          */
2181 #if IS_ENABLED(CONFIG_IPV6_SIT)
2182         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2183                 cfg.fc_flags |= RTF_NONEXTHOP;
2184 #endif
2185 
2186         ip6_route_add(&cfg);
2187 }
2188 
2189 
2190 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2191                                                   int plen,
2192                                                   const struct net_device *dev,
2193                                                   u32 flags, u32 noflags)
2194 {
2195         struct fib6_node *fn;
2196         struct rt6_info *rt = NULL;
2197         struct fib6_table *table;
2198         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2199 
2200         table = fib6_get_table(dev_net(dev), tb_id);
2201         if (!table)
2202                 return NULL;
2203 
2204         read_lock_bh(&table->tb6_lock);
2205         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2206         if (!fn)
2207                 goto out;
2208 
2209         noflags |= RTF_CACHE;
2210         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2211                 if (rt->dst.dev->ifindex != dev->ifindex)
2212                         continue;
2213                 if ((rt->rt6i_flags & flags) != flags)
2214                         continue;
2215                 if ((rt->rt6i_flags & noflags) != 0)
2216                         continue;
2217                 dst_hold(&rt->dst);
2218                 break;
2219         }
2220 out:
2221         read_unlock_bh(&table->tb6_lock);
2222         return rt;
2223 }
2224 
2225 
2226 /* Create "default" multicast route to the interface */
2227 
2228 static void addrconf_add_mroute(struct net_device *dev)
2229 {
2230         struct fib6_config cfg = {
2231                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2232                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2233                 .fc_ifindex = dev->ifindex,
2234                 .fc_dst_len = 8,
2235                 .fc_flags = RTF_UP,
2236                 .fc_nlinfo.nl_net = dev_net(dev),
2237         };
2238 
2239         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2240 
2241         ip6_route_add(&cfg);
2242 }
2243 
2244 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2245 {
2246         struct inet6_dev *idev;
2247 
2248         ASSERT_RTNL();
2249 
2250         idev = ipv6_find_idev(dev);
2251         if (!idev)
2252                 return ERR_PTR(-ENOBUFS);
2253 
2254         if (idev->cnf.disable_ipv6)
2255                 return ERR_PTR(-EACCES);
2256 
2257         /* Add default multicast route */
2258         if (!(dev->flags & IFF_LOOPBACK))
2259                 addrconf_add_mroute(dev);
2260 
2261         return idev;
2262 }
2263 
2264 static void manage_tempaddrs(struct inet6_dev *idev,
2265                              struct inet6_ifaddr *ifp,
2266                              __u32 valid_lft, __u32 prefered_lft,
2267                              bool create, unsigned long now)
2268 {
2269         u32 flags;
2270         struct inet6_ifaddr *ift;
2271 
2272         read_lock_bh(&idev->lock);
2273         /* update all temporary addresses in the list */
2274         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2275                 int age, max_valid, max_prefered;
2276 
2277                 if (ifp != ift->ifpub)
2278                         continue;
2279 
2280                 /* RFC 4941 section 3.3:
2281                  * If a received option will extend the lifetime of a public
2282                  * address, the lifetimes of temporary addresses should
2283                  * be extended, subject to the overall constraint that no
2284                  * temporary addresses should ever remain "valid" or "preferred"
2285                  * for a time longer than (TEMP_VALID_LIFETIME) or
2286                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2287                  */
2288                 age = (now - ift->cstamp) / HZ;
2289                 max_valid = idev->cnf.temp_valid_lft - age;
2290                 if (max_valid < 0)
2291                         max_valid = 0;
2292 
2293                 max_prefered = idev->cnf.temp_prefered_lft -
2294                                idev->cnf.max_desync_factor - age;
2295                 if (max_prefered < 0)
2296                         max_prefered = 0;
2297 
2298                 if (valid_lft > max_valid)
2299                         valid_lft = max_valid;
2300 
2301                 if (prefered_lft > max_prefered)
2302                         prefered_lft = max_prefered;
2303 
2304                 spin_lock(&ift->lock);
2305                 flags = ift->flags;
2306                 ift->valid_lft = valid_lft;
2307                 ift->prefered_lft = prefered_lft;
2308                 ift->tstamp = now;
2309                 if (prefered_lft > 0)
2310                         ift->flags &= ~IFA_F_DEPRECATED;
2311 
2312                 spin_unlock(&ift->lock);
2313                 if (!(flags&IFA_F_TENTATIVE))
2314                         ipv6_ifa_notify(0, ift);
2315         }
2316 
2317         if ((create || list_empty(&idev->tempaddr_list)) &&
2318             idev->cnf.use_tempaddr > 0) {
2319                 /* When a new public address is created as described
2320                  * in [ADDRCONF], also create a new temporary address.
2321                  * Also create a temporary address if it's enabled but
2322                  * no temporary address currently exists.
2323                  */
2324                 read_unlock_bh(&idev->lock);
2325                 ipv6_create_tempaddr(ifp, NULL);
2326         } else {
2327                 read_unlock_bh(&idev->lock);
2328         }
2329 }
2330 
2331 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2332 {
2333         return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2334                idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2335 }
2336 
2337 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2338 {
2339         struct prefix_info *pinfo;
2340         __u32 valid_lft;
2341         __u32 prefered_lft;
2342         int addr_type;
2343         u32 addr_flags = 0;
2344         struct inet6_dev *in6_dev;
2345         struct net *net = dev_net(dev);
2346 
2347         pinfo = (struct prefix_info *) opt;
2348 
2349         if (len < sizeof(struct prefix_info)) {
2350                 ADBG("addrconf: prefix option too short\n");
2351                 return;
2352         }
2353 
2354         /*
2355          *      Validation checks ([ADDRCONF], page 19)
2356          */
2357 
2358         addr_type = ipv6_addr_type(&pinfo->prefix);
2359 
2360         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2361                 return;
2362 
2363         valid_lft = ntohl(pinfo->valid);
2364         prefered_lft = ntohl(pinfo->prefered);
2365 
2366         if (prefered_lft > valid_lft) {
2367                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2368                 return;
2369         }
2370 
2371         in6_dev = in6_dev_get(dev);
2372 
2373         if (!in6_dev) {
2374                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2375                                     dev->name);
2376                 return;
2377         }
2378 
2379         /*
2380          *      Two things going on here:
2381          *      1) Add routes for on-link prefixes
2382          *      2) Configure prefixes with the auto flag set
2383          */
2384 
2385         if (pinfo->onlink) {
2386                 struct rt6_info *rt;
2387                 unsigned long rt_expires;
2388 
2389                 /* Avoid arithmetic overflow. Really, we could
2390                  * save rt_expires in seconds, likely valid_lft,
2391                  * but it would require division in fib gc, that it
2392                  * not good.
2393                  */
2394                 if (HZ > USER_HZ)
2395                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2396                 else
2397                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2398 
2399                 if (addrconf_finite_timeout(rt_expires))
2400                         rt_expires *= HZ;
2401 
2402                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2403                                                pinfo->prefix_len,
2404                                                dev,
2405                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2406                                                RTF_GATEWAY | RTF_DEFAULT);
2407 
2408                 if (rt) {
2409                         /* Autoconf prefix route */
2410                         if (valid_lft == 0) {
2411                                 ip6_del_rt(rt);
2412                                 rt = NULL;
2413                         } else if (addrconf_finite_timeout(rt_expires)) {
2414                                 /* not infinity */
2415                                 rt6_set_expires(rt, jiffies + rt_expires);
2416                         } else {
2417                                 rt6_clean_expires(rt);
2418                         }
2419                 } else if (valid_lft) {
2420                         clock_t expires = 0;
2421                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2422                         if (addrconf_finite_timeout(rt_expires)) {
2423                                 /* not infinity */
2424                                 flags |= RTF_EXPIRES;
2425                                 expires = jiffies_to_clock_t(rt_expires);
2426                         }
2427                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2428                                               dev, expires, flags);
2429                 }
2430                 ip6_rt_put(rt);
2431         }
2432 
2433         /* Try to figure out our local address for this prefix */
2434 
2435         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2436                 struct inet6_ifaddr *ifp;
2437                 struct in6_addr addr;
2438                 int create = 0, update_lft = 0;
2439                 bool tokenized = false;
2440 
2441                 if (pinfo->prefix_len == 64) {
2442                         memcpy(&addr, &pinfo->prefix, 8);
2443 
2444                         if (!ipv6_addr_any(&in6_dev->token)) {
2445                                 read_lock_bh(&in6_dev->lock);
2446                                 memcpy(addr.s6_addr + 8,
2447                                        in6_dev->token.s6_addr + 8, 8);
2448                                 read_unlock_bh(&in6_dev->lock);
2449                                 tokenized = true;
2450                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2451                                    !ipv6_generate_stable_address(&addr, 0,
2452                                                                  in6_dev)) {
2453                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2454                                 goto ok;
2455                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2456                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2457                                 in6_dev_put(in6_dev);
2458                                 return;
2459                         }
2460                         goto ok;
2461                 }
2462                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2463                                     pinfo->prefix_len);
2464                 in6_dev_put(in6_dev);
2465                 return;
2466 
2467 ok:
2468 
2469                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2470 
2471                 if (!ifp && valid_lft) {
2472                         int max_addresses = in6_dev->cnf.max_addresses;
2473 
2474 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2475                         if (in6_dev->cnf.optimistic_dad &&
2476                             !net->ipv6.devconf_all->forwarding && sllao)
2477                                 addr_flags |= IFA_F_OPTIMISTIC;
2478 #endif
2479 
2480                         /* Do not allow to create too much of autoconfigured
2481                          * addresses; this would be too easy way to crash kernel.
2482                          */
2483                         if (!max_addresses ||
2484                             ipv6_count_addresses(in6_dev) < max_addresses)
2485                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2486                                                     pinfo->prefix_len,
2487                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2488                                                     addr_flags, valid_lft,
2489                                                     prefered_lft);
2490 
2491                         if (IS_ERR_OR_NULL(ifp)) {
2492                                 in6_dev_put(in6_dev);
2493                                 return;
2494                         }
2495 
2496                         update_lft = 0;
2497                         create = 1;
2498                         spin_lock_bh(&ifp->lock);
2499                         ifp->flags |= IFA_F_MANAGETEMPADDR;
2500                         ifp->cstamp = jiffies;
2501                         ifp->tokenized = tokenized;
2502                         spin_unlock_bh(&ifp->lock);
2503                         addrconf_dad_start(ifp);
2504                 }
2505 
2506                 if (ifp) {
2507                         u32 flags;
2508                         unsigned long now;
2509                         u32 stored_lft;
2510 
2511                         /* update lifetime (RFC2462 5.5.3 e) */
2512                         spin_lock_bh(&ifp->lock);
2513                         now = jiffies;
2514                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2515                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2516                         else
2517                                 stored_lft = 0;
2518                         if (!update_lft && !create && stored_lft) {
2519                                 const u32 minimum_lft = min_t(u32,
2520                                         stored_lft, MIN_VALID_LIFETIME);
2521                                 valid_lft = max(valid_lft, minimum_lft);
2522 
2523                                 /* RFC4862 Section 5.5.3e:
2524                                  * "Note that the preferred lifetime of the
2525                                  *  corresponding address is always reset to
2526                                  *  the Preferred Lifetime in the received
2527                                  *  Prefix Information option, regardless of
2528                                  *  whether the valid lifetime is also reset or
2529                                  *  ignored."
2530                                  *
2531                                  * So we should always update prefered_lft here.
2532                                  */
2533                                 update_lft = 1;
2534                         }
2535 
2536                         if (update_lft) {
2537                                 ifp->valid_lft = valid_lft;
2538                                 ifp->prefered_lft = prefered_lft;
2539                                 ifp->tstamp = now;
2540                                 flags = ifp->flags;
2541                                 ifp->flags &= ~IFA_F_DEPRECATED;
2542                                 spin_unlock_bh(&ifp->lock);
2543 
2544                                 if (!(flags&IFA_F_TENTATIVE))
2545                                         ipv6_ifa_notify(0, ifp);
2546                         } else
2547                                 spin_unlock_bh(&ifp->lock);
2548 
2549                         manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2550                                          create, now);
2551 
2552                         in6_ifa_put(ifp);
2553                         addrconf_verify();
2554                 }
2555         }
2556         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2557         in6_dev_put(in6_dev);
2558 }
2559 
2560 /*
2561  *      Set destination address.
2562  *      Special case for SIT interfaces where we create a new "virtual"
2563  *      device.
2564  */
2565 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2566 {
2567         struct in6_ifreq ireq;
2568         struct net_device *dev;
2569         int err = -EINVAL;
2570 
2571         rtnl_lock();
2572 
2573         err = -EFAULT;
2574         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2575                 goto err_exit;
2576 
2577         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2578 
2579         err = -ENODEV;
2580         if (!dev)
2581                 goto err_exit;
2582 
2583 #if IS_ENABLED(CONFIG_IPV6_SIT)
2584         if (dev->type == ARPHRD_SIT) {
2585                 const struct net_device_ops *ops = dev->netdev_ops;
2586                 struct ifreq ifr;
2587                 struct ip_tunnel_parm p;
2588 
2589                 err = -EADDRNOTAVAIL;
2590                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2591                         goto err_exit;
2592 
2593                 memset(&p, 0, sizeof(p));
2594                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2595                 p.iph.saddr = 0;
2596                 p.iph.version = 4;
2597                 p.iph.ihl = 5;
2598                 p.iph.protocol = IPPROTO_IPV6;
2599                 p.iph.ttl = 64;
2600                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2601 
2602                 if (ops->ndo_do_ioctl) {
2603                         mm_segment_t oldfs = get_fs();
2604 
2605                         set_fs(KERNEL_DS);
2606                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2607                         set_fs(oldfs);
2608                 } else
2609                         err = -EOPNOTSUPP;
2610 
2611                 if (err == 0) {
2612                         err = -ENOBUFS;
2613                         dev = __dev_get_by_name(net, p.name);
2614                         if (!dev)
2615                                 goto err_exit;
2616                         err = dev_open(dev);
2617                 }
2618         }
2619 #endif
2620 
2621 err_exit:
2622         rtnl_unlock();
2623         return err;
2624 }
2625 
2626 static int ipv6_mc_config(struct sock *sk, bool join,
2627                           const struct in6_addr *addr, int ifindex)
2628 {
2629         int ret;
2630 
2631         ASSERT_RTNL();
2632 
2633         lock_sock(sk);
2634         if (join)
2635                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2636         else
2637                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2638         release_sock(sk);
2639 
2640         return ret;
2641 }
2642 
2643 /*
2644  *      Manual configuration of address on an interface
2645  */
2646 static int inet6_addr_add(struct net *net, int ifindex,
2647                           const struct in6_addr *pfx,
2648                           const struct in6_addr *peer_pfx,
2649                           unsigned int plen, __u32 ifa_flags,
2650                           __u32 prefered_lft, __u32 valid_lft)
2651 {
2652         struct inet6_ifaddr *ifp;
2653         struct inet6_dev *idev;
2654         struct net_device *dev;
2655         unsigned long timeout;
2656         clock_t expires;
2657         int scope;
2658         u32 flags;
2659 
2660         ASSERT_RTNL();
2661 
2662         if (plen > 128)
2663                 return -EINVAL;
2664 
2665         /* check the lifetime */
2666         if (!valid_lft || prefered_lft > valid_lft)
2667                 return -EINVAL;
2668 
2669         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2670                 return -EINVAL;
2671 
2672         dev = __dev_get_by_index(net, ifindex);
2673         if (!dev)
2674                 return -ENODEV;
2675 
2676         idev = addrconf_add_dev(dev);
2677         if (IS_ERR(idev))
2678                 return PTR_ERR(idev);
2679 
2680         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2681                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2682                                          true, pfx, ifindex);
2683 
2684                 if (ret < 0)
2685                         return ret;
2686         }
2687 
2688         scope = ipv6_addr_scope(pfx);
2689 
2690         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2691         if (addrconf_finite_timeout(timeout)) {
2692                 expires = jiffies_to_clock_t(timeout * HZ);
2693                 valid_lft = timeout;
2694                 flags = RTF_EXPIRES;
2695         } else {
2696                 expires = 0;
2697                 flags = 0;
2698                 ifa_flags |= IFA_F_PERMANENT;
2699         }
2700 
2701         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2702         if (addrconf_finite_timeout(timeout)) {
2703                 if (timeout == 0)
2704                         ifa_flags |= IFA_F_DEPRECATED;
2705                 prefered_lft = timeout;
2706         }
2707 
2708         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2709                             valid_lft, prefered_lft);
2710 
2711         if (!IS_ERR(ifp)) {
2712                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2713                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2714                                               expires, flags);
2715                 }
2716 
2717                 /*
2718                  * Note that section 3.1 of RFC 4429 indicates
2719                  * that the Optimistic flag should not be set for
2720                  * manually configured addresses
2721                  */
2722                 addrconf_dad_start(ifp);
2723                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2724                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2725                                          true, jiffies);
2726                 in6_ifa_put(ifp);
2727                 addrconf_verify_rtnl();
2728                 return 0;
2729         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2730                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2731                                false, pfx, ifindex);
2732         }
2733 
2734         return PTR_ERR(ifp);
2735 }
2736 
2737 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2738                           const struct in6_addr *pfx, unsigned int plen)
2739 {
2740         struct inet6_ifaddr *ifp;
2741         struct inet6_dev *idev;
2742         struct net_device *dev;
2743 
2744         if (plen > 128)
2745                 return -EINVAL;
2746 
2747         dev = __dev_get_by_index(net, ifindex);
2748         if (!dev)
2749                 return -ENODEV;
2750 
2751         idev = __in6_dev_get(dev);
2752         if (!idev)
2753                 return -ENXIO;
2754 
2755         read_lock_bh(&idev->lock);
2756         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2757                 if (ifp->prefix_len == plen &&
2758                     ipv6_addr_equal(pfx, &ifp->addr)) {
2759                         in6_ifa_hold(ifp);
2760                         read_unlock_bh(&idev->lock);
2761 
2762                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2763                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2764                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2765                                                  jiffies);
2766                         ipv6_del_addr(ifp);
2767                         addrconf_verify_rtnl();
2768                         if (ipv6_addr_is_multicast(pfx)) {
2769                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2770                                                false, pfx, dev->ifindex);
2771                         }
2772                         return 0;
2773                 }
2774         }
2775         read_unlock_bh(&idev->lock);
2776         return -EADDRNOTAVAIL;
2777 }
2778 
2779 
2780 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2781 {
2782         struct in6_ifreq ireq;
2783         int err;
2784 
2785         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2786                 return -EPERM;
2787 
2788         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2789                 return -EFAULT;
2790 
2791         rtnl_lock();
2792         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2793                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2794                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2795         rtnl_unlock();
2796         return err;
2797 }
2798 
2799 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2800 {
2801         struct in6_ifreq ireq;
2802         int err;
2803 
2804         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2805                 return -EPERM;
2806 
2807         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2808                 return -EFAULT;
2809 
2810         rtnl_lock();
2811         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2812                              ireq.ifr6_prefixlen);
2813         rtnl_unlock();
2814         return err;
2815 }
2816 
2817 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2818                      int plen, int scope)
2819 {
2820         struct inet6_ifaddr *ifp;
2821 
2822         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2823                             scope, IFA_F_PERMANENT,
2824                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2825         if (!IS_ERR(ifp)) {
2826                 spin_lock_bh(&ifp->lock);
2827                 ifp->flags &= ~IFA_F_TENTATIVE;
2828                 spin_unlock_bh(&ifp->lock);
2829                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2830                 in6_ifa_put(ifp);
2831         }
2832 }
2833 
2834 #if IS_ENABLED(CONFIG_IPV6_SIT)
2835 static void sit_add_v4_addrs(struct inet6_dev *idev)
2836 {
2837         struct in6_addr addr;
2838         struct net_device *dev;
2839         struct net *net = dev_net(idev->dev);
2840         int scope, plen;
2841         u32 pflags = 0;
2842 
2843         ASSERT_RTNL();
2844 
2845         memset(&addr, 0, sizeof(struct in6_addr));
2846         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2847 
2848         if (idev->dev->flags&IFF_POINTOPOINT) {
2849                 addr.s6_addr32[0] = htonl(0xfe800000);
2850                 scope = IFA_LINK;
2851                 plen = 64;
2852         } else {
2853                 scope = IPV6_ADDR_COMPATv4;
2854                 plen = 96;
2855                 pflags |= RTF_NONEXTHOP;
2856         }
2857 
2858         if (addr.s6_addr32[3]) {
2859                 add_addr(idev, &addr, plen, scope);
2860                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2861                 return;
2862         }
2863 
2864         for_each_netdev(net, dev) {
2865                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2866                 if (in_dev && (dev->flags & IFF_UP)) {
2867                         struct in_ifaddr *ifa;
2868 
2869                         int flag = scope;
2870 
2871                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2872 
2873                                 addr.s6_addr32[3] = ifa->ifa_local;
2874 
2875                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2876                                         continue;
2877                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2878                                         if (idev->dev->flags&IFF_POINTOPOINT)
2879                                                 continue;
2880                                         flag |= IFA_HOST;
2881                                 }
2882 
2883                                 add_addr(idev, &addr, plen, flag);
2884                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2885                                                       pflags);
2886                         }
2887                 }
2888         }
2889 }
2890 #endif
2891 
2892 static void init_loopback(struct net_device *dev)
2893 {
2894         struct inet6_dev  *idev;
2895         struct net_device *sp_dev;
2896         struct inet6_ifaddr *sp_ifa;
2897         struct rt6_info *sp_rt;
2898 
2899         /* ::1 */
2900 
2901         ASSERT_RTNL();
2902 
2903         idev = ipv6_find_idev(dev);
2904         if (!idev) {
2905                 pr_debug("%s: add_dev failed\n", __func__);
2906                 return;
2907         }
2908 
2909         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2910 
2911         /* Add routes to other interface's IPv6 addresses */
2912         for_each_netdev(dev_net(dev), sp_dev) {
2913                 if (!strcmp(sp_dev->name, dev->name))
2914                         continue;
2915 
2916                 idev = __in6_dev_get(sp_dev);
2917                 if (!idev)
2918                         continue;
2919 
2920                 read_lock_bh(&idev->lock);
2921                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2922 
2923                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2924                                 continue;
2925 
2926                         if (sp_ifa->rt) {
2927                                 /* This dst has been added to garbage list when
2928                                  * lo device down, release this obsolete dst and
2929                                  * reallocate a new router for ifa.
2930                                  */
2931                                 if (sp_ifa->rt->dst.obsolete > 0) {
2932                                         ip6_rt_put(sp_ifa->rt);
2933                                         sp_ifa->rt = NULL;
2934                                 } else {
2935                                         continue;
2936                                 }
2937                         }
2938 
2939                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2940 
2941                         /* Failure cases are ignored */
2942                         if (!IS_ERR(sp_rt)) {
2943                                 sp_ifa->rt = sp_rt;
2944                                 ip6_ins_rt(sp_rt);
2945                         }
2946                 }
2947                 read_unlock_bh(&idev->lock);
2948         }
2949 }
2950 
2951 static void addrconf_add_linklocal(struct inet6_dev *idev,
2952                                    const struct in6_addr *addr, u32 flags)
2953 {
2954         struct inet6_ifaddr *ifp;
2955         u32 addr_flags = flags | IFA_F_PERMANENT;
2956 
2957 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2958         if (idev->cnf.optimistic_dad &&
2959             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2960                 addr_flags |= IFA_F_OPTIMISTIC;
2961 #endif
2962 
2963         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2964                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2965         if (!IS_ERR(ifp)) {
2966                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2967                 addrconf_dad_start(ifp);
2968                 in6_ifa_put(ifp);
2969         }
2970 }
2971 
2972 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2973 {
2974         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2975                 return true;
2976 
2977         if (address.s6_addr32[2] == htonl(0x02005eff) &&
2978             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2979                 return true;
2980 
2981         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2982             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2983                 return true;
2984 
2985         return false;
2986 }
2987 
2988 static int ipv6_generate_stable_address(struct in6_addr *address,
2989                                         u8 dad_count,
2990                                         const struct inet6_dev *idev)
2991 {
2992         static DEFINE_SPINLOCK(lock);
2993         static __u32 digest[SHA_DIGEST_WORDS];
2994         static __u32 workspace[SHA_WORKSPACE_WORDS];
2995 
2996         static union {
2997                 char __data[SHA_MESSAGE_BYTES];
2998                 struct {
2999                         struct in6_addr secret;
3000                         __be32 prefix[2];
3001                         unsigned char hwaddr[MAX_ADDR_LEN];
3002                         u8 dad_count;
3003                 } __packed;
3004         } data;
3005 
3006         struct in6_addr secret;
3007         struct in6_addr temp;
3008         struct net *net = dev_net(idev->dev);
3009 
3010         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3011 
3012         if (idev->cnf.stable_secret.initialized)
3013                 secret = idev->cnf.stable_secret.secret;
3014         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3015                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3016         else
3017                 return -1;
3018 
3019 retry:
3020         spin_lock_bh(&lock);
3021 
3022         sha_init(digest);
3023         memset(&data, 0, sizeof(data));
3024         memset(workspace, 0, sizeof(workspace));
3025         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3026         data.prefix[0] = address->s6_addr32[0];
3027         data.prefix[1] = address->s6_addr32[1];
3028         data.secret = secret;
3029         data.dad_count = dad_count;
3030 
3031         sha_transform(digest, data.__data, workspace);
3032 
3033         temp = *address;
3034         temp.s6_addr32[2] = (__force __be32)digest[0];
3035         temp.s6_addr32[3] = (__force __be32)digest[1];
3036 
3037         spin_unlock_bh(&lock);
3038 
3039         if (ipv6_reserved_interfaceid(temp)) {
3040                 dad_count++;
3041                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3042                         return -1;
3043                 goto retry;
3044         }
3045 
3046         *address = temp;
3047         return 0;
3048 }
3049 
3050 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3051 {
3052         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3053 
3054         if (s->initialized)
3055                 return;
3056         s = &idev->cnf.stable_secret;
3057         get_random_bytes(&s->secret, sizeof(s->secret));
3058         s->initialized = true;
3059 }
3060 
3061 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3062 {
3063         struct in6_addr addr;
3064 
3065         /* no link local addresses on L3 master devices */
3066         if (netif_is_l3_master(idev->dev))
3067                 return;
3068 
3069         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3070 
3071         switch (idev->addr_gen_mode) {
3072         case IN6_ADDR_GEN_MODE_RANDOM:
3073                 ipv6_gen_mode_random_init(idev);
3074                 /* fallthrough */
3075         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3076                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3077                         addrconf_add_linklocal(idev, &addr,
3078                                                IFA_F_STABLE_PRIVACY);
3079                 else if (prefix_route)
3080                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3081                 break;
3082         case IN6_ADDR_GEN_MODE_EUI64:
3083                 /* addrconf_add_linklocal also adds a prefix_route and we
3084                  * only need to care about prefix routes if ipv6_generate_eui64
3085                  * couldn't generate one.
3086                  */
3087                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3088                         addrconf_add_linklocal(idev, &addr, 0);
3089                 else if (prefix_route)
3090                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3091                 break;
3092         case IN6_ADDR_GEN_MODE_NONE:
3093         default:
3094                 /* will not add any link local address */
3095                 break;
3096         }
3097 }
3098 
3099 static void addrconf_dev_config(struct net_device *dev)
3100 {
3101         struct inet6_dev *idev;
3102 
3103         ASSERT_RTNL();
3104 
3105         if ((dev->type != ARPHRD_ETHER) &&
3106             (dev->type != ARPHRD_FDDI) &&
3107             (dev->type != ARPHRD_ARCNET) &&
3108             (dev->type != ARPHRD_INFINIBAND) &&
3109             (dev->type != ARPHRD_IEEE1394) &&
3110             (dev->type != ARPHRD_TUNNEL6) &&
3111             (dev->type != ARPHRD_6LOWPAN) &&
3112             (dev->type != ARPHRD_NONE)) {
3113                 /* Alas, we support only Ethernet autoconfiguration. */
3114                 return;
3115         }
3116 
3117         idev = addrconf_add_dev(dev);
3118         if (IS_ERR(idev))
3119                 return;
3120 
3121         /* this device type has no EUI support */
3122         if (dev->type == ARPHRD_NONE &&
3123             idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3124                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3125 
3126         addrconf_addr_gen(idev, false);
3127 }
3128 
3129 #if IS_ENABLED(CONFIG_IPV6_SIT)
3130 static void addrconf_sit_config(struct net_device *dev)
3131 {
3132         struct inet6_dev *idev;
3133 
3134         ASSERT_RTNL();
3135 
3136         /*
3137          * Configure the tunnel with one of our IPv4
3138          * addresses... we should configure all of
3139          * our v4 addrs in the tunnel
3140          */
3141 
3142         idev = ipv6_find_idev(dev);
3143         if (!idev) {
3144                 pr_debug("%s: add_dev failed\n", __func__);
3145                 return;
3146         }
3147 
3148         if (dev->priv_flags & IFF_ISATAP) {
3149                 addrconf_addr_gen(idev, false);
3150                 return;
3151         }
3152 
3153         sit_add_v4_addrs(idev);
3154 
3155         if (dev->flags&IFF_POINTOPOINT)
3156                 addrconf_add_mroute(dev);
3157 }
3158 #endif
3159 
3160 #if IS_ENABLED(CONFIG_NET_IPGRE)
3161 static void addrconf_gre_config(struct net_device *dev)
3162 {
3163         struct inet6_dev *idev;
3164 
3165         ASSERT_RTNL();
3166 
3167         idev = ipv6_find_idev(dev);
3168         if (!idev) {
3169                 pr_debug("%s: add_dev failed\n", __func__);
3170                 return;
3171         }
3172 
3173         addrconf_addr_gen(idev, true);
3174         if (dev->flags & IFF_POINTOPOINT)
3175                 addrconf_add_mroute(dev);
3176 }
3177 #endif
3178 
3179 static int fixup_permanent_addr(struct inet6_dev *idev,
3180                                 struct inet6_ifaddr *ifp)
3181 {
3182         if (!ifp->rt) {
3183                 struct rt6_info *rt;
3184 
3185                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3186                 if (unlikely(IS_ERR(rt)))
3187                         return PTR_ERR(rt);
3188 
3189                 ifp->rt = rt;
3190         }
3191 
3192         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3193                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3194                                       idev->dev, 0, 0);
3195         }
3196 
3197         addrconf_dad_start(ifp);
3198 
3199         return 0;
3200 }
3201 
3202 static void addrconf_permanent_addr(struct net_device *dev)
3203 {
3204         struct inet6_ifaddr *ifp, *tmp;
3205         struct inet6_dev *idev;
3206 
3207         idev = __in6_dev_get(dev);
3208         if (!idev)
3209                 return;
3210 
3211         write_lock_bh(&idev->lock);
3212 
3213         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3214                 if ((ifp->flags & IFA_F_PERMANENT) &&
3215                     fixup_permanent_addr(idev, ifp) < 0) {
3216                         write_unlock_bh(&idev->lock);
3217                         ipv6_del_addr(ifp);
3218                         write_lock_bh(&idev->lock);
3219 
3220                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3221                                              idev->dev->name, &ifp->addr);
3222                 }
3223         }
3224 
3225         write_unlock_bh(&idev->lock);
3226 }
3227 
3228 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3229                            void *ptr)
3230 {
3231         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3232         struct netdev_notifier_changeupper_info *info;
3233         struct inet6_dev *idev = __in6_dev_get(dev);
3234         int run_pending = 0;
3235         int err;
3236 
3237         switch (event) {
3238         case NETDEV_REGISTER:
3239                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3240                         idev = ipv6_add_dev(dev);
3241                         if (IS_ERR(idev))
3242                                 return notifier_from_errno(PTR_ERR(idev));
3243                 }
3244                 break;
3245 
3246         case NETDEV_CHANGEMTU:
3247                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3248                 if (dev->mtu < IPV6_MIN_MTU) {
3249                         addrconf_ifdown(dev, 1);
3250                         break;
3251                 }
3252 
3253                 if (idev) {
3254                         rt6_mtu_change(dev, dev->mtu);
3255                         idev->cnf.mtu6 = dev->mtu;
3256                         break;
3257                 }
3258 
3259                 /* allocate new idev */
3260                 idev = ipv6_add_dev(dev);
3261                 if (IS_ERR(idev))
3262                         break;
3263 
3264                 /* device is still not ready */
3265                 if (!(idev->if_flags & IF_READY))
3266                         break;
3267 
3268                 run_pending = 1;
3269 
3270                 /* fall through */
3271 
3272         case NETDEV_UP:
3273         case NETDEV_CHANGE:
3274                 if (dev->flags & IFF_SLAVE)
3275                         break;
3276 
3277                 if (idev && idev->cnf.disable_ipv6)
3278                         break;
3279 
3280                 if (event == NETDEV_UP) {
3281                         /* restore routes for permanent addresses */
3282                         addrconf_permanent_addr(dev);
3283 
3284                         if (!addrconf_qdisc_ok(dev)) {
3285                                 /* device is not ready yet. */
3286                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3287                                         dev->name);
3288                                 break;
3289                         }
3290 
3291                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3292                                 idev = ipv6_add_dev(dev);
3293 
3294                         if (!IS_ERR_OR_NULL(idev)) {
3295                                 idev->if_flags |= IF_READY;
3296                                 run_pending = 1;
3297                         }
3298                 } else if (event == NETDEV_CHANGE) {
3299                         if (!addrconf_qdisc_ok(dev)) {
3300                                 /* device is still not ready. */
3301                                 break;
3302                         }
3303 
3304                         if (idev) {
3305                                 if (idev->if_flags & IF_READY)
3306                                         /* device is already configured. */
3307                                         break;
3308                                 idev->if_flags |= IF_READY;
3309                         }
3310 
3311                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3312                                 dev->name);
3313 
3314                         run_pending = 1;
3315                 }
3316 
3317                 switch (dev->type) {
3318 #if IS_ENABLED(CONFIG_IPV6_SIT)
3319                 case ARPHRD_SIT:
3320                         addrconf_sit_config(dev);
3321                         break;
3322 #endif
3323 #if IS_ENABLED(CONFIG_NET_IPGRE)
3324                 case ARPHRD_IPGRE:
3325                         addrconf_gre_config(dev);
3326                         break;
3327 #endif
3328                 case ARPHRD_LOOPBACK:
3329                         init_loopback(dev);
3330                         break;
3331 
3332                 default:
3333                         addrconf_dev_config(dev);
3334                         break;
3335                 }
3336 
3337                 if (!IS_ERR_OR_NULL(idev)) {
3338                         if (run_pending)
3339                                 addrconf_dad_run(idev);
3340 
3341                         /*
3342                          * If the MTU changed during the interface down,
3343                          * when the interface up, the changed MTU must be
3344                          * reflected in the idev as well as routers.
3345                          */
3346                         if (idev->cnf.mtu6 != dev->mtu &&
3347                             dev->mtu >= IPV6_MIN_MTU) {
3348                                 rt6_mtu_change(dev, dev->mtu);
3349                                 idev->cnf.mtu6 = dev->mtu;
3350                         }
3351                         idev->tstamp = jiffies;
3352                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3353 
3354                         /*
3355                          * If the changed mtu during down is lower than
3356                          * IPV6_MIN_MTU stop IPv6 on this interface.
3357                          */
3358                         if (dev->mtu < IPV6_MIN_MTU)
3359                                 addrconf_ifdown(dev, 1);
3360                 }
3361                 break;
3362 
3363         case NETDEV_DOWN:
3364         case NETDEV_UNREGISTER:
3365                 /*
3366                  *      Remove all addresses from this interface.
3367                  */
3368                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3369                 break;
3370 
3371         case NETDEV_CHANGENAME:
3372                 if (idev) {
3373                         snmp6_unregister_dev(idev);
3374                         addrconf_sysctl_unregister(idev);
3375                         err = addrconf_sysctl_register(idev);
3376                         if (err)
3377                                 return notifier_from_errno(err);
3378                         err = snmp6_register_dev(idev);
3379                         if (err) {
3380                                 addrconf_sysctl_unregister(idev);
3381                                 return notifier_from_errno(err);
3382                         }
3383                 }
3384                 break;
3385 
3386         case NETDEV_PRE_TYPE_CHANGE:
3387         case NETDEV_POST_TYPE_CHANGE:
3388                 if (idev)
3389                         addrconf_type_change(dev, event);
3390                 break;
3391 
3392         case NETDEV_CHANGEUPPER:
3393                 info = ptr;
3394 
3395                 /* flush all routes if dev is linked to or unlinked from
3396                  * an L3 master device (e.g., VRF)
3397                  */
3398                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3399                         addrconf_ifdown(dev, 0);
3400         }
3401 
3402         return NOTIFY_OK;
3403 }
3404 
3405 /*
3406  *      addrconf module should be notified of a device going up
3407  */
3408 static struct notifier_block ipv6_dev_notf = {
3409         .notifier_call = addrconf_notify,
3410 };
3411 
3412 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3413 {
3414         struct inet6_dev *idev;
3415         ASSERT_RTNL();
3416 
3417         idev = __in6_dev_get(dev);
3418 
3419         if (event == NETDEV_POST_TYPE_CHANGE)
3420                 ipv6_mc_remap(idev);
3421         else if (event == NETDEV_PRE_TYPE_CHANGE)
3422                 ipv6_mc_unmap(idev);
3423 }
3424 
3425 static bool addr_is_local(const struct in6_addr *addr)
3426 {
3427         return ipv6_addr_type(addr) &
3428                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3429 }
3430 
3431 static int addrconf_ifdown(struct net_device *dev, int how)
3432 {
3433         struct net *net = dev_net(dev);
3434         struct inet6_dev *idev;
3435         struct inet6_ifaddr *ifa, *tmp;
3436         struct list_head del_list;
3437         int _keep_addr;
3438         bool keep_addr;
3439         int state, i;
3440 
3441         ASSERT_RTNL();
3442 
3443         rt6_ifdown(net, dev);
3444         neigh_ifdown(&nd_tbl, dev);
3445 
3446         idev = __in6_dev_get(dev);
3447         if (!idev)
3448                 return -ENODEV;
3449 
3450         /*
3451          * Step 1: remove reference to ipv6 device from parent device.
3452          *         Do not dev_put!
3453          */
3454         if (how) {
3455                 idev->dead = 1;
3456 
3457                 /* protected by rtnl_lock */
3458                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3459 
3460                 /* Step 1.5: remove snmp6 entry */
3461                 snmp6_unregister_dev(idev);
3462 
3463         }
3464 
3465         /* aggregate the system setting and interface setting */
3466         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3467         if (!_keep_addr)
3468                 _keep_addr = idev->cnf.keep_addr_on_down;
3469 
3470         /* combine the user config with event to determine if permanent
3471          * addresses are to be removed from address hash table
3472          */
3473         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3474 
3475         /* Step 2: clear hash table */
3476         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3477                 struct hlist_head *h = &inet6_addr_lst[i];
3478 
3479                 spin_lock_bh(&addrconf_hash_lock);
3480 restart:
3481                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3482                         if (ifa->idev == idev) {
3483                                 addrconf_del_dad_work(ifa);
3484                                 /* combined flag + permanent flag decide if
3485                                  * address is retained on a down event
3486                                  */
3487                                 if (!keep_addr ||
3488                                     !(ifa->flags & IFA_F_PERMANENT) ||
3489                                     addr_is_local(&ifa->addr)) {
3490                                         hlist_del_init_rcu(&ifa->addr_lst);
3491                                         goto restart;
3492                                 }
3493                         }
3494                 }
3495                 spin_unlock_bh(&addrconf_hash_lock);
3496         }
3497 
3498         write_lock_bh(&idev->lock);
3499 
3500         addrconf_del_rs_timer(idev);
3501 
3502         /* Step 2: clear flags for stateless addrconf */
3503         if (!how)
3504                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3505 
3506         if (how && del_timer(&idev->regen_timer))
3507                 in6_dev_put(idev);
3508 
3509         /* Step 3: clear tempaddr list */
3510         while (!list_empty(&idev->tempaddr_list)) {
3511                 ifa = list_first_entry(&idev->tempaddr_list,
3512                                        struct inet6_ifaddr, tmp_list);
3513                 list_del(&ifa->tmp_list);
3514                 write_unlock_bh(&idev->lock);
3515                 spin_lock_bh(&ifa->lock);
3516 
3517                 if (ifa->ifpub) {
3518                         in6_ifa_put(ifa->ifpub);
3519                         ifa->ifpub = NULL;
3520                 }
3521                 spin_unlock_bh(&ifa->lock);
3522                 in6_ifa_put(ifa);
3523                 write_lock_bh(&idev->lock);
3524         }
3525 
3526         /* re-combine the user config with event to determine if permanent
3527          * addresses are to be removed from the interface list
3528          */
3529         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3530 
3531         INIT_LIST_HEAD(&del_list);
3532         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3533                 struct rt6_info *rt = NULL;
3534 
3535                 addrconf_del_dad_work(ifa);
3536 
3537                 write_unlock_bh(&idev->lock);
3538                 spin_lock_bh(&ifa->lock);
3539 
3540                 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3541                     !addr_is_local(&ifa->addr)) {
3542                         /* set state to skip the notifier below */
3543                         state = INET6_IFADDR_STATE_DEAD;
3544                         ifa->state = 0;
3545                         if (!(ifa->flags & IFA_F_NODAD))
3546                                 ifa->flags |= IFA_F_TENTATIVE;
3547 
3548                         rt = ifa->rt;
3549                         ifa->rt = NULL;
3550                 } else {
3551                         state = ifa->state;
3552                         ifa->state = INET6_IFADDR_STATE_DEAD;
3553 
3554                         list_del(&ifa->if_list);
3555                         list_add(&ifa->if_list, &del_list);
3556                 }
3557 
3558                 spin_unlock_bh(&ifa->lock);
3559 
3560                 if (rt)
3561                         ip6_del_rt(rt);
3562 
3563                 if (state != INET6_IFADDR_STATE_DEAD) {
3564                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3565                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3566                 } else {
3567                         if (idev->cnf.forwarding)
3568                                 addrconf_leave_anycast(ifa);
3569                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3570                 }
3571 
3572                 write_lock_bh(&idev->lock);
3573         }
3574 
3575         write_unlock_bh(&idev->lock);
3576 
3577         /* now clean up addresses to be removed */
3578         while (!list_empty(&del_list)) {
3579                 ifa = list_first_entry(&del_list,
3580                                        struct inet6_ifaddr, if_list);
3581                 list_del(&ifa->if_list);
3582 
3583                 in6_ifa_put(ifa);
3584         }
3585 
3586         /* Step 5: Discard anycast and multicast list */
3587         if (how) {
3588                 ipv6_ac_destroy_dev(idev);
3589                 ipv6_mc_destroy_dev(idev);
3590         } else {
3591                 ipv6_mc_down(idev);
3592         }
3593 
3594         idev->tstamp = jiffies;
3595 
3596         /* Last: Shot the device (if unregistered) */
3597         if (how) {
3598                 addrconf_sysctl_unregister(idev);
3599                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3600                 neigh_ifdown(&nd_tbl, dev);
3601                 in6_dev_put(idev);
3602         }
3603         return 0;
3604 }
3605 
3606 static void addrconf_rs_timer(unsigned long data)
3607 {
3608         struct inet6_dev *idev = (struct inet6_dev *)data;
3609         struct net_device *dev = idev->dev;
3610         struct in6_addr lladdr;
3611 
3612         write_lock(&idev->lock);
3613         if (idev->dead || !(idev->if_flags & IF_READY))
3614                 goto out;
3615 
3616         if (!ipv6_accept_ra(idev))
3617                 goto out;
3618 
3619         /* Announcement received after solicitation was sent */
3620         if (idev->if_flags & IF_RA_RCVD)
3621                 goto out;
3622 
3623         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3624                 write_unlock(&idev->lock);
3625                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3626                         ndisc_send_rs(dev, &lladdr,
3627                                       &in6addr_linklocal_allrouters);
3628                 else
3629                         goto put;
3630 
3631                 write_lock(&idev->lock);
3632                 /* The wait after the last probe can be shorter */
3633                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3634                                              idev->cnf.rtr_solicits) ?
3635                                       idev->cnf.rtr_solicit_delay :
3636                                       idev->cnf.rtr_solicit_interval);
3637         } else {
3638                 /*
3639                  * Note: we do not support deprecated "all on-link"
3640                  * assumption any longer.
3641                  */
3642                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3643         }
3644 
3645 out:
3646         write_unlock(&idev->lock);
3647 put:
3648         in6_dev_put(idev);
3649 }
3650 
3651 /*
3652  *      Duplicate Address Detection
3653  */
3654 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3655 {
3656         unsigned long rand_num;
3657         struct inet6_dev *idev = ifp->idev;
3658 
3659         if (ifp->flags & IFA_F_OPTIMISTIC)
3660                 rand_num = 0;
3661         else
3662                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3663 
3664         ifp->dad_probes = idev->cnf.dad_transmits;
3665         addrconf_mod_dad_work(ifp, rand_num);
3666 }
3667 
3668 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3669 {
3670         struct inet6_dev *idev = ifp->idev;
3671         struct net_device *dev = idev->dev;
3672         bool notify = false;
3673 
3674         addrconf_join_solict(dev, &ifp->addr);
3675 
3676         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3677 
3678         read_lock_bh(&idev->lock);
3679         spin_lock(&ifp->lock);
3680         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3681                 goto out;
3682 
3683         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3684             idev->cnf.accept_dad < 1 ||
3685             !(ifp->flags&IFA_F_TENTATIVE) ||
3686             ifp->flags & IFA_F_NODAD) {
3687                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3688                 spin_unlock(&ifp->lock);
3689                 read_unlock_bh(&idev->lock);
3690 
3691                 addrconf_dad_completed(ifp);
3692                 return;
3693         }
3694 
3695         if (!(idev->if_flags & IF_READY)) {
3696                 spin_unlock(&ifp->lock);
3697                 read_unlock_bh(&idev->lock);
3698                 /*
3699                  * If the device is not ready:
3700                  * - keep it tentative if it is a permanent address.
3701                  * - otherwise, kill it.
3702                  */
3703                 in6_ifa_hold(ifp);
3704                 addrconf_dad_stop(ifp, 0);
3705                 return;
3706         }
3707 
3708         /*
3709          * Optimistic nodes can start receiving
3710          * Frames right away
3711          */
3712         if (ifp->flags & IFA_F_OPTIMISTIC) {
3713                 ip6_ins_rt(ifp->rt);
3714                 if (ipv6_use_optimistic_addr(idev)) {
3715                         /* Because optimistic nodes can use this address,
3716                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3717                          */
3718                         notify = true;
3719                 }
3720         }
3721 
3722         addrconf_dad_kick(ifp);
3723 out:
3724         spin_unlock(&ifp->lock);
3725         read_unlock_bh(&idev->lock);
3726         if (notify)
3727                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3728 }
3729 
3730 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3731 {
3732         bool begin_dad = false;
3733 
3734         spin_lock_bh(&ifp->lock);
3735         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3736                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3737                 begin_dad = true;
3738         }
3739         spin_unlock_bh(&ifp->lock);
3740 
3741         if (begin_dad)
3742                 addrconf_mod_dad_work(ifp, 0);
3743 }
3744 
3745 static void addrconf_dad_work(struct work_struct *w)
3746 {
3747         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3748                                                 struct inet6_ifaddr,
3749                                                 dad_work);
3750         struct inet6_dev *idev = ifp->idev;
3751         struct in6_addr mcaddr;
3752 
3753         enum {
3754                 DAD_PROCESS,
3755                 DAD_BEGIN,
3756                 DAD_ABORT,
3757         } action = DAD_PROCESS;
3758 
3759         rtnl_lock();
3760 
3761         spin_lock_bh(&ifp->lock);
3762         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3763                 action = DAD_BEGIN;
3764                 ifp->state = INET6_IFADDR_STATE_DAD;
3765         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3766                 action = DAD_ABORT;
3767                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3768         }
3769         spin_unlock_bh(&ifp->lock);
3770 
3771         if (action == DAD_BEGIN) {
3772                 addrconf_dad_begin(ifp);
3773                 goto out;
3774         } else if (action == DAD_ABORT) {
3775                 in6_ifa_hold(ifp);
3776                 addrconf_dad_stop(ifp, 1);
3777                 goto out;
3778         }
3779 
3780         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3781                 goto out;
3782 
3783         write_lock_bh(&idev->lock);
3784         if (idev->dead || !(idev->if_flags & IF_READY)) {
3785                 write_unlock_bh(&idev->lock);
3786                 goto out;
3787         }
3788 
3789         spin_lock(&ifp->lock);
3790         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3791                 spin_unlock(&ifp->lock);
3792                 write_unlock_bh(&idev->lock);
3793                 goto out;
3794         }
3795 
3796         if (ifp->dad_probes == 0) {
3797                 /*
3798                  * DAD was successful
3799                  */
3800 
3801                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3802                 spin_unlock(&ifp->lock);
3803                 write_unlock_bh(&idev->lock);
3804 
3805                 addrconf_dad_completed(ifp);
3806 
3807                 goto out;
3808         }
3809 
3810         ifp->dad_probes--;
3811         addrconf_mod_dad_work(ifp,
3812                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3813         spin_unlock(&ifp->lock);
3814         write_unlock_bh(&idev->lock);
3815 
3816         /* send a neighbour solicitation for our addr */
3817         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3818         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3819 out:
3820         in6_ifa_put(ifp);
3821         rtnl_unlock();
3822 }
3823 
3824 /* ifp->idev must be at least read locked */
3825 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3826 {
3827         struct inet6_ifaddr *ifpiter;
3828         struct inet6_dev *idev = ifp->idev;
3829 
3830         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3831                 if (ifpiter->scope > IFA_LINK)
3832                         break;
3833                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3834                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3835                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3836                     IFA_F_PERMANENT)
3837                         return false;
3838         }
3839         return true;
3840 }
3841 
3842 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3843 {
3844         struct net_device *dev = ifp->idev->dev;
3845         struct in6_addr lladdr;
3846         bool send_rs, send_mld;
3847 
3848         addrconf_del_dad_work(ifp);
3849 
3850         /*
3851          *      Configure the address for reception. Now it is valid.
3852          */
3853 
3854         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3855 
3856         /* If added prefix is link local and we are prepared to process
3857            router advertisements, start sending router solicitations.
3858          */
3859 
3860         read_lock_bh(&ifp->idev->lock);
3861         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3862         send_rs = send_mld &&
3863                   ipv6_accept_ra(ifp->idev) &&
3864                   ifp->idev->cnf.rtr_solicits > 0 &&
3865                   (dev->flags&IFF_LOOPBACK) == 0;
3866         read_unlock_bh(&ifp->idev->lock);
3867 
3868         /* While dad is in progress mld report's source address is in6_addrany.
3869          * Resend with proper ll now.
3870          */
3871         if (send_mld)
3872                 ipv6_mc_dad_complete(ifp->idev);
3873 
3874         if (send_rs) {
3875                 /*
3876                  *      If a host as already performed a random delay
3877                  *      [...] as part of DAD [...] there is no need
3878                  *      to delay again before sending the first RS
3879                  */
3880                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3881                         return;
3882                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3883 
3884                 write_lock_bh(&ifp->idev->lock);
3885                 spin_lock(&ifp->lock);
3886                 ifp->idev->rs_probes = 1;
3887                 ifp->idev->if_flags |= IF_RS_SENT;
3888                 addrconf_mod_rs_timer(ifp->idev,
3889                                       ifp->idev->cnf.rtr_solicit_interval);
3890                 spin_unlock(&ifp->lock);
3891                 write_unlock_bh(&ifp->idev->lock);
3892         }
3893 }
3894 
3895 static void addrconf_dad_run(struct inet6_dev *idev)
3896 {
3897         struct inet6_ifaddr *ifp;
3898 
3899         read_lock_bh(&idev->lock);
3900         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3901                 spin_lock(&ifp->lock);
3902                 if (ifp->flags & IFA_F_TENTATIVE &&
3903                     ifp->state == INET6_IFADDR_STATE_DAD)
3904                         addrconf_dad_kick(ifp);
3905                 spin_unlock(&ifp->lock);
3906         }
3907         read_unlock_bh(&idev->lock);
3908 }
3909 
3910 #ifdef CONFIG_PROC_FS
3911 struct if6_iter_state {
3912         struct seq_net_private p;
3913         int bucket;
3914         int offset;
3915 };
3916 
3917 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3918 {
3919         struct inet6_ifaddr *ifa = NULL;
3920         struct if6_iter_state *state = seq->private;
3921         struct net *net = seq_file_net(seq);
3922         int p = 0;
3923 
3924         /* initial bucket if pos is 0 */
3925         if (pos == 0) {
3926                 state->bucket = 0;
3927                 state->offset = 0;
3928         }
3929 
3930         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3931                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3932                                          addr_lst) {
3933                         if (!net_eq(dev_net(ifa->idev->dev), net))
3934                                 continue;
3935                         /* sync with offset */
3936                         if (p < state->offset) {
3937                                 p++;
3938                                 continue;
3939                         }
3940                         state->offset++;
3941                         return ifa;
3942                 }
3943 
3944                 /* prepare for next bucket */
3945                 state->offset = 0;
3946                 p = 0;
3947         }
3948         return NULL;
3949 }
3950 
3951 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3952                                          struct inet6_ifaddr *ifa)
3953 {
3954         struct if6_iter_state *state = seq->private;
3955         struct net *net = seq_file_net(seq);
3956 
3957         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3958                 if (!net_eq(dev_net(ifa->idev->dev), net))
3959                         continue;
3960                 state->offset++;
3961                 return ifa;
3962         }
3963 
3964         while (++state->bucket < IN6_ADDR_HSIZE) {
3965                 state->offset = 0;
3966                 hlist_for_each_entry_rcu_bh(ifa,
3967                                      &inet6_addr_lst[state->bucket], addr_lst) {
3968                         if (!net_eq(dev_net(ifa->idev->dev), net))
3969                                 continue;
3970                         state->offset++;
3971                         return ifa;
3972                 }
3973         }
3974 
3975         return NULL;
3976 }
3977 
3978 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3979         __acquires(rcu_bh)
3980 {
3981         rcu_read_lock_bh();
3982         return if6_get_first(seq, *pos);
3983 }
3984 
3985 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3986 {
3987         struct inet6_ifaddr *ifa;
3988 
3989         ifa = if6_get_next(seq, v);
3990         ++*pos;
3991         return ifa;
3992 }
3993 
3994 static void if6_seq_stop(struct seq_file *seq, void *v)
3995         __releases(rcu_bh)
3996 {
3997         rcu_read_unlock_bh();
3998 }
3999 
4000 static int if6_seq_show(struct seq_file *seq, void *v)
4001 {
4002         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4003         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4004                    &ifp->addr,
4005                    ifp->idev->dev->ifindex,
4006                    ifp->prefix_len,
4007                    ifp->scope,
4008                    (u8) ifp->flags,
4009                    ifp->idev->dev->name);
4010         return 0;
4011 }
4012 
4013 static const struct seq_operations if6_seq_ops = {
4014         .start  = if6_seq_start,
4015         .next   = if6_seq_next,
4016         .show   = if6_seq_show,
4017         .stop   = if6_seq_stop,
4018 };
4019 
4020 static int if6_seq_open(struct inode *inode, struct file *file)
4021 {
4022         return seq_open_net(inode, file, &if6_seq_ops,
4023                             sizeof(struct if6_iter_state));
4024 }
4025 
4026 static const struct file_operations if6_fops = {
4027         .owner          = THIS_MODULE,
4028         .open           = if6_seq_open,
4029         .read           = seq_read,
4030         .llseek         = seq_lseek,
4031         .release        = seq_release_net,
4032 };
4033 
4034 static int __net_init if6_proc_net_init(struct net *net)
4035 {
4036         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4037                 return -ENOMEM;
4038         return 0;
4039 }
4040 
4041 static void __net_exit if6_proc_net_exit(struct net *net)
4042 {
4043         remove_proc_entry("if_inet6", net->proc_net);
4044 }
4045 
4046 static struct pernet_operations if6_proc_net_ops = {
4047         .init = if6_proc_net_init,
4048         .exit = if6_proc_net_exit,
4049 };
4050 
4051 int __init if6_proc_init(void)
4052 {
4053         return register_pernet_subsys(&if6_proc_net_ops);
4054 }
4055 
4056 void if6_proc_exit(void)
4057 {
4058         unregister_pernet_subsys(&if6_proc_net_ops);
4059 }
4060 #endif  /* CONFIG_PROC_FS */
4061 
4062 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4063 /* Check if address is a home address configured on any interface. */
4064 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4065 {
4066         int ret = 0;
4067         struct inet6_ifaddr *ifp = NULL;
4068         unsigned int hash = inet6_addr_hash(addr);
4069 
4070         rcu_read_lock_bh();
4071         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4072                 if (!net_eq(dev_net(ifp->idev->dev), net))
4073                         continue;
4074                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4075                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4076                         ret = 1;
4077                         break;
4078                 }
4079         }
4080         rcu_read_unlock_bh();
4081         return ret;
4082 }
4083 #endif
4084 
4085 /*
4086  *      Periodic address status verification
4087  */
4088 
4089 static void addrconf_verify_rtnl(void)
4090 {
4091         unsigned long now, next, next_sec, next_sched;
4092         struct inet6_ifaddr *ifp;
4093         int i;
4094 
4095         ASSERT_RTNL();
4096 
4097         rcu_read_lock_bh();
4098         now = jiffies;
4099         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4100 
4101         cancel_delayed_work(&addr_chk_work);
4102 
4103         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4104 restart:
4105                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4106                         unsigned long age;
4107 
4108                         /* When setting preferred_lft to a value not zero or
4109                          * infinity, while valid_lft is infinity
4110                          * IFA_F_PERMANENT has a non-infinity life time.
4111                          */
4112                         if ((ifp->flags & IFA_F_PERMANENT) &&
4113                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4114                                 continue;
4115 
4116                         spin_lock(&ifp->lock);
4117                         /* We try to batch several events at once. */
4118                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4119 
4120                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4121                             age >= ifp->valid_lft) {
4122                                 spin_unlock(&ifp->lock);
4123                                 in6_ifa_hold(ifp);
4124                                 ipv6_del_addr(ifp);
4125                                 goto restart;
4126                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4127                                 spin_unlock(&ifp->lock);
4128                                 continue;
4129                         } else if (age >= ifp->prefered_lft) {
4130                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4131                                 int deprecate = 0;
4132 
4133                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4134                                         deprecate = 1;
4135                                         ifp->flags |= IFA_F_DEPRECATED;
4136                                 }
4137 
4138                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4139                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4140                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4141 
4142                                 spin_unlock(&ifp->lock);
4143 
4144                                 if (deprecate) {
4145                                         in6_ifa_hold(ifp);
4146 
4147                                         ipv6_ifa_notify(0, ifp);
4148                                         in6_ifa_put(ifp);
4149                                         goto restart;
4150                                 }
4151                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4152                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4153                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4154                                         ifp->idev->cnf.dad_transmits *
4155                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4156 
4157                                 if (age >= ifp->prefered_lft - regen_advance) {
4158                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4159                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4160                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4161                                         if (!ifp->regen_count && ifpub) {
4162                                                 ifp->regen_count++;
4163                                                 in6_ifa_hold(ifp);
4164                                                 in6_ifa_hold(ifpub);
4165                                                 spin_unlock(&ifp->lock);
4166 
4167                                                 spin_lock(&ifpub->lock);
4168                                                 ifpub->regen_count = 0;
4169                                                 spin_unlock(&ifpub->lock);
4170                                                 ipv6_create_tempaddr(ifpub, ifp);
4171                                                 in6_ifa_put(ifpub);
4172                                                 in6_ifa_put(ifp);
4173                                                 goto restart;
4174                                         }
4175                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4176                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4177                                 spin_unlock(&ifp->lock);
4178                         } else {
4179                                 /* ifp->prefered_lft <= ifp->valid_lft */
4180                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4181                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4182                                 spin_unlock(&ifp->lock);
4183                         }
4184                 }
4185         }
4186 
4187         next_sec = round_jiffies_up(next);
4188         next_sched = next;
4189 
4190         /* If rounded timeout is accurate enough, accept it. */
4191         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4192                 next_sched = next_sec;
4193 
4194         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4195         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4196                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4197 
4198         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4199               now, next, next_sec, next_sched);
4200         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4201         rcu_read_unlock_bh();
4202 }
4203 
4204 static void addrconf_verify_work(struct work_struct *w)
4205 {
4206         rtnl_lock();
4207         addrconf_verify_rtnl();
4208         rtnl_unlock();
4209 }
4210 
4211 static void addrconf_verify(void)
4212 {
4213         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4214 }
4215 
4216 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4217                                      struct in6_addr **peer_pfx)
4218 {
4219         struct in6_addr *pfx = NULL;
4220 
4221         *peer_pfx = NULL;
4222 
4223         if (addr)
4224                 pfx = nla_data(addr);
4225 
4226         if (local) {
4227                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4228                         *peer_pfx = pfx;
4229                 pfx = nla_data(local);
4230         }
4231 
4232         return pfx;
4233 }
4234 
4235 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4236         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4237         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4238         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4239         [IFA_FLAGS]             = { .len = sizeof(u32) },
4240 };
4241 
4242 static int
4243 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4244 {
4245         struct net *net = sock_net(skb->sk);
4246         struct ifaddrmsg *ifm;
4247         struct nlattr *tb[IFA_MAX+1];
4248         struct in6_addr *pfx, *peer_pfx;
4249         u32 ifa_flags;
4250         int err;
4251 
4252         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4253         if (err < 0)
4254                 return err;
4255 
4256         ifm = nlmsg_data(nlh);
4257         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4258         if (!pfx)
4259                 return -EINVAL;
4260 
4261         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4262 
4263         /* We ignore other flags so far. */
4264         ifa_flags &= IFA_F_MANAGETEMPADDR;
4265 
4266         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4267                               ifm->ifa_prefixlen);
4268 }
4269 
4270 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4271                              u32 prefered_lft, u32 valid_lft)
4272 {
4273         u32 flags;
4274         clock_t expires;
4275         unsigned long timeout;
4276         bool was_managetempaddr;
4277         bool had_prefixroute;
4278 
4279         ASSERT_RTNL();
4280 
4281         if (!valid_lft || (prefered_lft > valid_lft))
4282                 return -EINVAL;
4283 
4284         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4285             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4286                 return -EINVAL;
4287 
4288         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4289         if (addrconf_finite_timeout(timeout)) {
4290                 expires = jiffies_to_clock_t(timeout * HZ);
4291                 valid_lft = timeout;
4292                 flags = RTF_EXPIRES;
4293         } else {
4294                 expires = 0;
4295                 flags = 0;
4296                 ifa_flags |= IFA_F_PERMANENT;
4297         }
4298 
4299         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4300         if (addrconf_finite_timeout(timeout)) {
4301                 if (timeout == 0)
4302                         ifa_flags |= IFA_F_DEPRECATED;
4303                 prefered_lft = timeout;
4304         }
4305 
4306         spin_lock_bh(&ifp->lock);
4307         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4308         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4309                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4310         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4311                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4312                         IFA_F_NOPREFIXROUTE);
4313         ifp->flags |= ifa_flags;
4314         ifp->tstamp = jiffies;
4315         ifp->valid_lft = valid_lft;
4316         ifp->prefered_lft = prefered_lft;
4317 
4318         spin_unlock_bh(&ifp->lock);
4319         if (!(ifp->flags&IFA_F_TENTATIVE))
4320                 ipv6_ifa_notify(0, ifp);
4321 
4322         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4323                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4324                                       expires, flags);
4325         } else if (had_prefixroute) {
4326                 enum cleanup_prefix_rt_t action;
4327                 unsigned long rt_expires;
4328 
4329                 write_lock_bh(&ifp->idev->lock);
4330                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4331                 write_unlock_bh(&ifp->idev->lock);
4332 
4333                 if (action != CLEANUP_PREFIX_RT_NOP) {
4334                         cleanup_prefix_route(ifp, rt_expires,
4335                                 action == CLEANUP_PREFIX_RT_DEL);
4336                 }
4337         }
4338 
4339         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4340                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4341                         valid_lft = prefered_lft = 0;
4342                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4343                                  !was_managetempaddr, jiffies);
4344         }
4345 
4346         addrconf_verify_rtnl();
4347 
4348         return 0;
4349 }
4350 
4351 static int
4352 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4353 {
4354         struct net *net = sock_net(skb->sk);
4355         struct ifaddrmsg *ifm;
4356         struct nlattr *tb[IFA_MAX+1];
4357         struct in6_addr *pfx, *peer_pfx;
4358         struct inet6_ifaddr *ifa;
4359         struct net_device *dev;
4360         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4361         u32 ifa_flags;
4362         int err;
4363 
4364         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4365         if (err < 0)
4366                 return err;
4367 
4368         ifm = nlmsg_data(nlh);
4369         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4370         if (!pfx)
4371                 return -EINVAL;
4372 
4373         if (tb[IFA_CACHEINFO]) {
4374                 struct ifa_cacheinfo *ci;
4375 
4376                 ci = nla_data(tb[IFA_CACHEINFO]);
4377                 valid_lft = ci->ifa_valid;
4378                 preferred_lft = ci->ifa_prefered;
4379         } else {
4380                 preferred_lft = INFINITY_LIFE_TIME;
4381                 valid_lft = INFINITY_LIFE_TIME;
4382         }
4383 
4384         dev =  __dev_get_by_index(net, ifm->ifa_index);
4385         if (!dev)
4386                 return -ENODEV;
4387 
4388         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4389 
4390         /* We ignore other flags so far. */
4391         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4392                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4393 
4394         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4395         if (!ifa) {
4396                 /*
4397                  * It would be best to check for !NLM_F_CREATE here but
4398                  * userspace already relies on not having to provide this.
4399                  */
4400                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4401                                       ifm->ifa_prefixlen, ifa_flags,
4402                                       preferred_lft, valid_lft);
4403         }
4404 
4405         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4406             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4407                 err = -EEXIST;
4408         else
4409                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4410 
4411         in6_ifa_put(ifa);
4412 
4413         return err;
4414 }
4415 
4416 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4417                           u8 scope, int ifindex)
4418 {
4419         struct ifaddrmsg *ifm;
4420 
4421         ifm = nlmsg_data(nlh);
4422         ifm->ifa_family = AF_INET6;
4423         ifm->ifa_prefixlen = prefixlen;
4424         ifm->ifa_flags = flags;
4425         ifm->ifa_scope = scope;
4426         ifm->ifa_index = ifindex;
4427 }
4428 
4429 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4430                          unsigned long tstamp, u32 preferred, u32 valid)
4431 {
4432         struct ifa_cacheinfo ci;
4433 
4434         ci.cstamp = cstamp_delta(cstamp);
4435         ci.tstamp = cstamp_delta(tstamp);
4436         ci.ifa_prefered = preferred;
4437         ci.ifa_valid = valid;
4438 
4439         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4440 }
4441 
4442 static inline int rt_scope(int ifa_scope)
4443 {
4444         if (ifa_scope & IFA_HOST)
4445                 return RT_SCOPE_HOST;
4446         else if (ifa_scope & IFA_LINK)
4447                 return RT_SCOPE_LINK;
4448         else if (ifa_scope & IFA_SITE)
4449                 return RT_SCOPE_SITE;
4450         else
4451                 return RT_SCOPE_UNIVERSE;
4452 }
4453 
4454 static inline int inet6_ifaddr_msgsize(void)
4455 {
4456         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4457                + nla_total_size(16) /* IFA_LOCAL */
4458                + nla_total_size(16) /* IFA_ADDRESS */
4459                + nla_total_size(sizeof(struct ifa_cacheinfo))
4460                + nla_total_size(4)  /* IFA_FLAGS */;
4461 }
4462 
4463 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4464                              u32 portid, u32 seq, int event, unsigned int flags)
4465 {
4466         struct nlmsghdr  *nlh;
4467         u32 preferred, valid;
4468 
4469         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4470         if (!nlh)
4471                 return -EMSGSIZE;
4472 
4473         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4474                       ifa->idev->dev->ifindex);
4475 
4476         if (!((ifa->flags&IFA_F_PERMANENT) &&
4477               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4478                 preferred = ifa->prefered_lft;
4479                 valid = ifa->valid_lft;
4480                 if (preferred != INFINITY_LIFE_TIME) {
4481                         long tval = (jiffies - ifa->tstamp)/HZ;
4482                         if (preferred > tval)
4483                                 preferred -= tval;
4484                         else
4485                                 preferred = 0;
4486                         if (valid != INFINITY_LIFE_TIME) {
4487                                 if (valid > tval)
4488                                         valid -= tval;
4489                                 else
4490                                         valid = 0;
4491                         }
4492                 }
4493         } else {
4494                 preferred = INFINITY_LIFE_TIME;
4495                 valid = INFINITY_LIFE_TIME;
4496         }
4497 
4498         if (!ipv6_addr_any(&ifa->peer_addr)) {
4499                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4500                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4501                         goto error;
4502         } else
4503                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4504                         goto error;
4505 
4506         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4507                 goto error;
4508 
4509         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4510                 goto error;
4511 
4512         nlmsg_end(skb, nlh);
4513         return 0;
4514 
4515 error:
4516         nlmsg_cancel(skb, nlh);
4517         return -EMSGSIZE;
4518 }
4519 
4520 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4521                                 u32 portid, u32 seq, int event, u16 flags)
4522 {
4523         struct nlmsghdr  *nlh;
4524         u8 scope = RT_SCOPE_UNIVERSE;
4525         int ifindex = ifmca->idev->dev->ifindex;
4526 
4527         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4528                 scope = RT_SCOPE_SITE;
4529 
4530         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4531         if (!nlh)
4532                 return -EMSGSIZE;
4533 
4534         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4535         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4536             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4537                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4538                 nlmsg_cancel(skb, nlh);
4539                 return -EMSGSIZE;
4540         }
4541 
4542         nlmsg_end(skb, nlh);
4543         return 0;
4544 }
4545 
4546 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4547                                 u32 portid, u32 seq, int event, unsigned int flags)
4548 {
4549         struct nlmsghdr  *nlh;
4550         u8 scope = RT_SCOPE_UNIVERSE;
4551         int ifindex = ifaca->aca_idev->dev->ifindex;
4552 
4553         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4554                 scope = RT_SCOPE_SITE;
4555 
4556         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4557         if (!nlh)
4558                 return -EMSGSIZE;
4559 
4560         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4561         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4562             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4563                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4564                 nlmsg_cancel(skb, nlh);
4565                 return -EMSGSIZE;
4566         }
4567 
4568         nlmsg_end(skb, nlh);
4569         return 0;
4570 }
4571 
4572 enum addr_type_t {
4573         UNICAST_ADDR,
4574         MULTICAST_ADDR,
4575         ANYCAST_ADDR,
4576 };
4577 
4578 /* called with rcu_read_lock() */
4579 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4580                           struct netlink_callback *cb, enum addr_type_t type,
4581                           int s_ip_idx, int *p_ip_idx)
4582 {
4583         struct ifmcaddr6 *ifmca;
4584         struct ifacaddr6 *ifaca;
4585         int err = 1;
4586         int ip_idx = *p_ip_idx;
4587 
4588         read_lock_bh(&idev->lock);
4589         switch (type) {
4590         case UNICAST_ADDR: {
4591                 struct inet6_ifaddr *ifa;
4592 
4593                 /* unicast address incl. temp addr */
4594                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4595                         if (++ip_idx < s_ip_idx)
4596                                 continue;
4597                         err = inet6_fill_ifaddr(skb, ifa,
4598                                                 NETLINK_CB(cb->skb).portid,
4599                                                 cb->nlh->nlmsg_seq,
4600                                                 RTM_NEWADDR,
4601                                                 NLM_F_MULTI);
4602                         if (err < 0)
4603                                 break;
4604                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4605                 }
4606                 break;
4607         }
4608         case MULTICAST_ADDR:
4609                 /* multicast address */
4610                 for (ifmca = idev->mc_list; ifmca;
4611                      ifmca = ifmca->next, ip_idx++) {
4612                         if (ip_idx < s_ip_idx)
4613                                 continue;
4614                         err = inet6_fill_ifmcaddr(skb, ifmca,
4615                                                   NETLINK_CB(cb->skb).portid,
4616                                                   cb->nlh->nlmsg_seq,
4617                                                   RTM_GETMULTICAST,
4618                                                   NLM_F_MULTI);
4619                         if (err < 0)
4620                                 break;
4621                 }
4622                 break;
4623         case ANYCAST_ADDR:
4624                 /* anycast address */
4625                 for (ifaca = idev->ac_list; ifaca;
4626                      ifaca = ifaca->aca_next, ip_idx++) {
4627                         if (ip_idx < s_ip_idx)
4628                                 continue;
4629                         err = inet6_fill_ifacaddr(skb, ifaca,
4630                                                   NETLINK_CB(cb->skb).portid,
4631                                                   cb->nlh->nlmsg_seq,
4632                                                   RTM_GETANYCAST,
4633                                                   NLM_F_MULTI);
4634                         if (err < 0)
4635                                 break;
4636                 }
4637                 break;
4638         default:
4639                 break;
4640         }
4641         read_unlock_bh(&idev->lock);
4642         *p_ip_idx = ip_idx;
4643         return err;
4644 }
4645 
4646 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4647                            enum addr_type_t type)
4648 {
4649         struct net *net = sock_net(skb->sk);
4650         int h, s_h;
4651         int idx, ip_idx;
4652         int s_idx, s_ip_idx;
4653         struct net_device *dev;
4654         struct inet6_dev *idev;
4655         struct hlist_head *head;
4656 
4657         s_h = cb->args[0];
4658         s_idx = idx = cb->args[1];
4659         s_ip_idx = ip_idx = cb->args[2];
4660 
4661         rcu_read_lock();
4662         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4663         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4664                 idx = 0;
4665                 head = &net->dev_index_head[h];
4666                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4667                         if (idx < s_idx)
4668                                 goto cont;
4669                         if (h > s_h || idx > s_idx)
4670                                 s_ip_idx = 0;
4671                         ip_idx = 0;
4672                         idev = __in6_dev_get(dev);
4673                         if (!idev)
4674                                 goto cont;
4675 
4676                         if (in6_dump_addrs(idev, skb, cb, type,
4677                                            s_ip_idx, &ip_idx) < 0)
4678                                 goto done;
4679 cont:
4680                         idx++;
4681                 }
4682         }
4683 done:
4684         rcu_read_unlock();
4685         cb->args[0] = h;
4686         cb->args[1] = idx;
4687         cb->args[2] = ip_idx;
4688 
4689         return skb->len;
4690 }
4691 
4692 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4693 {
4694         enum addr_type_t type = UNICAST_ADDR;
4695 
4696         return inet6_dump_addr(skb, cb, type);
4697 }
4698 
4699 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4700 {
4701         enum addr_type_t type = MULTICAST_ADDR;
4702 
4703         return inet6_dump_addr(skb, cb, type);
4704 }
4705 
4706 
4707 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4708 {
4709         enum addr_type_t type = ANYCAST_ADDR;
4710 
4711         return inet6_dump_addr(skb, cb, type);
4712 }
4713 
4714 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4715 {
4716         struct net *net = sock_net(in_skb->sk);
4717         struct ifaddrmsg *ifm;
4718         struct nlattr *tb[IFA_MAX+1];
4719         struct in6_addr *addr = NULL, *peer;
4720         struct net_device *dev = NULL;
4721         struct inet6_ifaddr *ifa;
4722         struct sk_buff *skb;
4723         int err;
4724 
4725         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4726         if (err < 0)
4727                 goto errout;
4728 
4729         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4730         if (!addr) {
4731                 err = -EINVAL;
4732                 goto errout;
4733         }
4734 
4735         ifm = nlmsg_data(nlh);
4736         if (ifm->ifa_index)
4737                 dev = __dev_get_by_index(net, ifm->ifa_index);
4738 
4739         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4740         if (!ifa) {
4741                 err = -EADDRNOTAVAIL;
4742                 goto errout;
4743         }
4744 
4745         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4746         if (!skb) {
4747                 err = -ENOBUFS;
4748                 goto errout_ifa;
4749         }
4750 
4751         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4752                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4753         if (err < 0) {
4754                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4755                 WARN_ON(err == -EMSGSIZE);
4756                 kfree_skb(skb);
4757                 goto errout_ifa;
4758         }
4759         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4760 errout_ifa:
4761         in6_ifa_put(ifa);
4762 errout:
4763         return err;
4764 }
4765 
4766 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4767 {
4768         struct sk_buff *skb;
4769         struct net *net = dev_net(ifa->idev->dev);
4770         int err = -ENOBUFS;
4771 
4772         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4773         if (!skb)
4774                 goto errout;
4775 
4776         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4777         if (err < 0) {
4778                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4779                 WARN_ON(err == -EMSGSIZE);
4780                 kfree_skb(skb);
4781                 goto errout;
4782         }
4783         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4784         return;
4785 errout:
4786         if (err < 0)
4787                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4788 }
4789 
4790 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4791                                 __s32 *array, int bytes)
4792 {
4793         BUG_ON(bytes < (DEVCONF_MAX * 4));
4794 
4795         memset(array, 0, bytes);
4796         array[DEVCONF_FORWARDING] = cnf->forwarding;
4797         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4798         array[DEVCONF_MTU6] = cnf->mtu6;
4799         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4800         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4801         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4802         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4803         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4804         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4805                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4806         array[DEVCONF_RTR_SOLICIT_DELAY] =
4807                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4808         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4809         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4810                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4811         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4812                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4813         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4814         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4815         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4816         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4817         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4818         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4819         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4820         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4821         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4822 #ifdef CONFIG_IPV6_ROUTER_PREF
4823         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4824         array[DEVCONF_RTR_PROBE_INTERVAL] =
4825                 jiffies_to_msecs(cnf->rtr_probe_interval);
4826 #ifdef CONFIG_IPV6_ROUTE_INFO
4827         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4828 #endif
4829 #endif
4830         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4831         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4832 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4833         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4834         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4835 #endif
4836 #ifdef CONFIG_IPV6_MROUTE
4837         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4838 #endif
4839         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4840         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4841         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4842         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4843         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4844         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4845         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4846         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4847         /* we omit DEVCONF_STABLE_SECRET for now */
4848         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4849         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4850         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4851         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4852 }
4853 
4854 static inline size_t inet6_ifla6_size(void)
4855 {
4856         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4857              + nla_total_size(sizeof(struct ifla_cacheinfo))
4858              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4859              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4860              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4861              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4862 }
4863 
4864 static inline size_t inet6_if_nlmsg_size(void)
4865 {
4866         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4867                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4868                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4869                + nla_total_size(4) /* IFLA_MTU */
4870                + nla_total_size(4) /* IFLA_LINK */
4871                + nla_total_size(1) /* IFLA_OPERSTATE */
4872                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4873 }
4874 
4875 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4876                                       int items, int bytes)
4877 {
4878         int i;
4879         int pad = bytes - sizeof(u64) * items;
4880         BUG_ON(pad < 0);
4881 
4882         /* Use put_unaligned() because stats may not be aligned for u64. */
4883         put_unaligned(items, &stats[0]);
4884         for (i = 1; i < items; i++)
4885                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4886 
4887         memset(&stats[items], 0, pad);
4888 }
4889 
4890 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4891                                         int bytes, size_t syncpoff)
4892 {
4893         int i, c;
4894         u64 buff[IPSTATS_MIB_MAX];
4895         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4896 
4897         BUG_ON(pad < 0);
4898 
4899         memset(buff, 0, sizeof(buff));
4900         buff[0] = IPSTATS_MIB_MAX;
4901 
4902         for_each_possible_cpu(c) {
4903                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4904                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4905         }
4906 
4907         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4908         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4909 }
4910 
4911 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4912                              int bytes)
4913 {
4914         switch (attrtype) {
4915         case IFLA_INET6_STATS:
4916                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4917                                      offsetof(struct ipstats_mib, syncp));
4918                 break;
4919         case IFLA_INET6_ICMP6STATS:
4920                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4921                 break;
4922         }
4923 }
4924 
4925 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4926                                   u32 ext_filter_mask)
4927 {
4928         struct nlattr *nla;
4929         struct ifla_cacheinfo ci;
4930 
4931         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4932                 goto nla_put_failure;
4933         ci.max_reasm_len = IPV6_MAXPLEN;
4934         ci.tstamp = cstamp_delta(idev->tstamp);
4935         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4936         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4937         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4938                 goto nla_put_failure;
4939         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4940         if (!nla)
4941                 goto nla_put_failure;
4942         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4943 
4944         /* XXX - MC not implemented */
4945 
4946         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4947                 return 0;
4948 
4949         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4950         if (!nla)
4951                 goto nla_put_failure;
4952         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4953 
4954         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4955         if (!nla)
4956                 goto nla_put_failure;
4957         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4958 
4959         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4960         if (!nla)
4961                 goto nla_put_failure;
4962 
4963         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4964                 goto nla_put_failure;
4965 
4966         read_lock_bh(&idev->lock);
4967         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4968         read_unlock_bh(&idev->lock);
4969 
4970         return 0;
4971 
4972 nla_put_failure:
4973         return -EMSGSIZE;
4974 }
4975 
4976 static size_t inet6_get_link_af_size(const struct net_device *dev,
4977                                      u32 ext_filter_mask)
4978 {
4979         if (!__in6_dev_get(dev))
4980                 return 0;
4981 
4982         return inet6_ifla6_size();
4983 }
4984 
4985 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4986                               u32 ext_filter_mask)
4987 {
4988         struct inet6_dev *idev = __in6_dev_get(dev);
4989 
4990         if (!idev)
4991                 return -ENODATA;
4992 
4993         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4994                 return -EMSGSIZE;
4995 
4996         return 0;
4997 }
4998 
4999 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5000 {
5001         struct inet6_ifaddr *ifp;
5002         struct net_device *dev = idev->dev;
5003         bool clear_token, update_rs = false;
5004         struct in6_addr ll_addr;
5005 
5006         ASSERT_RTNL();
5007 
5008         if (!token)
5009                 return -EINVAL;
5010         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5011                 return -EINVAL;
5012         if (!ipv6_accept_ra(idev))
5013                 return -EINVAL;
5014         if (idev->cnf.rtr_solicits <= 0)
5015                 return -EINVAL;
5016 
5017         write_lock_bh(&idev->lock);
5018 
5019         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5020         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5021 
5022         write_unlock_bh(&idev->lock);
5023 
5024         clear_token = ipv6_addr_any(token);
5025         if (clear_token)
5026                 goto update_lft;
5027 
5028         if (!idev->dead && (idev->if_flags & IF_READY) &&
5029             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5030                              IFA_F_OPTIMISTIC)) {
5031                 /* If we're not ready, then normal ifup will take care
5032                  * of this. Otherwise, we need to request our rs here.
5033                  */
5034                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5035                 update_rs = true;
5036         }
5037 
5038 update_lft:
5039         write_lock_bh(&idev->lock);
5040 
5041         if (update_rs) {
5042                 idev->if_flags |= IF_RS_SENT;
5043                 idev->rs_probes = 1;
5044                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
5045         }
5046 
5047         /* Well, that's kinda nasty ... */
5048         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5049                 spin_lock(&ifp->lock);
5050                 if (ifp->tokenized) {
5051                         ifp->valid_lft = 0;
5052                         ifp->prefered_lft = 0;
5053                 }
5054                 spin_unlock(&ifp->lock);
5055         }
5056 
5057         write_unlock_bh(&idev->lock);
5058         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5059         addrconf_verify_rtnl();
5060         return 0;
5061 }
5062 
5063 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5064         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5065         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5066 };
5067 
5068 static int inet6_validate_link_af(const struct net_device *dev,
5069                                   const struct nlattr *nla)
5070 {
5071         struct nlattr *tb[IFLA_INET6_MAX + 1];
5072 
5073         if (dev && !__in6_dev_get(dev))
5074                 return -EAFNOSUPPORT;
5075 
5076         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5077 }
5078 
5079 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5080 {
5081         int err = -EINVAL;
5082         struct inet6_dev *idev = __in6_dev_get(dev);
5083         struct nlattr *tb[IFLA_INET6_MAX + 1];
5084 
5085         if (!idev)
5086                 return -EAFNOSUPPORT;
5087 
5088         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5089                 BUG();
5090 
5091         if (tb[IFLA_INET6_TOKEN]) {
5092                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5093                 if (err)
5094                         return err;
5095         }
5096 
5097         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5098                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5099 
5100                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5101                     mode != IN6_ADDR_GEN_MODE_NONE &&
5102                     mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5103                     mode != IN6_ADDR_GEN_MODE_RANDOM)
5104                         return -EINVAL;
5105 
5106                 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5107                     !idev->cnf.stable_secret.initialized &&
5108                     !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5109                         return -EINVAL;
5110 
5111                 idev->addr_gen_mode = mode;
5112                 err = 0;
5113         }
5114 
5115         return err;
5116 }
5117 
5118 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5119                              u32 portid, u32 seq, int event, unsigned int flags)
5120 {
5121         struct net_device *dev = idev->dev;
5122         struct ifinfomsg *hdr;
5123         struct nlmsghdr *nlh;
5124         void *protoinfo;
5125 
5126         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5127         if (!nlh)
5128                 return -EMSGSIZE;
5129 
5130         hdr = nlmsg_data(nlh);
5131         hdr->ifi_family = AF_INET6;
5132         hdr->__ifi_pad = 0;
5133         hdr->ifi_type = dev->type;
5134         hdr->ifi_index = dev->ifindex;
5135         hdr->ifi_flags = dev_get_flags(dev);
5136         hdr->ifi_change = 0;
5137 
5138         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5139             (dev->addr_len &&
5140              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5141             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5142             (dev->ifindex != dev_get_iflink(dev) &&
5143              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5144             nla_put_u8(skb, IFLA_OPERSTATE,
5145                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5146                 goto nla_put_failure;
5147         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5148         if (!protoinfo)
5149                 goto nla_put_failure;
5150 
5151         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5152                 goto nla_put_failure;
5153 
5154         nla_nest_end(skb, protoinfo);
5155         nlmsg_end(skb, nlh);
5156         return 0;
5157 
5158 nla_put_failure:
5159         nlmsg_cancel(skb, nlh);
5160         return -EMSGSIZE;
5161 }
5162 
5163 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5164 {
5165         struct net *net = sock_net(skb->sk);
5166         int h, s_h;
5167         int idx = 0, s_idx;
5168         struct net_device *dev;
5169         struct inet6_dev *idev;
5170         struct hlist_head *head;
5171 
5172         s_h = cb->args[0];
5173         s_idx = cb->args[1];
5174 
5175         rcu_read_lock();
5176         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5177                 idx = 0;
5178                 head = &net->dev_index_head[h];
5179                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5180                         if (idx < s_idx)
5181                                 goto cont;
5182                         idev = __in6_dev_get(dev);
5183                         if (!idev)
5184                                 goto cont;
5185                         if (inet6_fill_ifinfo(skb, idev,
5186                                               NETLINK_CB(cb->skb).portid,
5187                                               cb->nlh->nlmsg_seq,
5188                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5189                                 goto out;
5190 cont:
5191                         idx++;
5192                 }
5193         }
5194 out:
5195         rcu_read_unlock();
5196         cb->args[1] = idx;
5197         cb->args[0] = h;
5198 
5199         return skb->len;
5200 }
5201 
5202 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5203 {
5204         struct sk_buff *skb;
5205         struct net *net = dev_net(idev->dev);
5206         int err = -ENOBUFS;
5207 
5208         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5209         if (!skb)
5210                 goto errout;
5211 
5212         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5213         if (err < 0) {
5214                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5215                 WARN_ON(err == -EMSGSIZE);
5216                 kfree_skb(skb);
5217                 goto errout;
5218         }
5219         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5220         return;
5221 errout:
5222         if (err < 0)
5223                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5224 }
5225 
5226 static inline size_t inet6_prefix_nlmsg_size(void)
5227 {
5228         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5229                + nla_total_size(sizeof(struct in6_addr))
5230                + nla_total_size(sizeof(struct prefix_cacheinfo));
5231 }
5232 
5233 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5234                              struct prefix_info *pinfo, u32 portid, u32 seq,
5235                              int event, unsigned int flags)
5236 {
5237         struct prefixmsg *pmsg;
5238         struct nlmsghdr *nlh;
5239         struct prefix_cacheinfo ci;
5240 
5241         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5242         if (!nlh)
5243                 return -EMSGSIZE;
5244 
5245         pmsg = nlmsg_data(nlh);
5246         pmsg->prefix_family = AF_INET6;
5247         pmsg->prefix_pad1 = 0;
5248         pmsg->prefix_pad2 = 0;
5249         pmsg->prefix_ifindex = idev->dev->ifindex;
5250         pmsg->prefix_len = pinfo->prefix_len;
5251         pmsg->prefix_type = pinfo->type;
5252         pmsg->prefix_pad3 = 0;
5253         pmsg->prefix_flags = 0;
5254         if (pinfo->onlink)
5255                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5256         if (pinfo->autoconf)
5257                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5258 
5259         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5260                 goto nla_put_failure;
5261         ci.preferred_time = ntohl(pinfo->prefered);
5262         ci.valid_time = ntohl(pinfo->valid);
5263         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5264                 goto nla_put_failure;
5265         nlmsg_end(skb, nlh);
5266         return 0;
5267 
5268 nla_put_failure:
5269         nlmsg_cancel(skb, nlh);
5270         return -EMSGSIZE;
5271 }
5272 
5273 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5274                          struct prefix_info *pinfo)
5275 {
5276         struct sk_buff *skb;
5277         struct net *net = dev_net(idev->dev);
5278         int err = -ENOBUFS;
5279 
5280         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5281         if (!skb)
5282                 goto errout;
5283 
5284         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5285         if (err < 0) {
5286                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5287                 WARN_ON(err == -EMSGSIZE);
5288                 kfree_skb(skb);
5289                 goto errout;
5290         }
5291         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5292         return;
5293 errout:
5294         if (err < 0)
5295                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5296 }
5297 
5298 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5299 {
5300         struct net *net = dev_net(ifp->idev->dev);
5301 
5302         if (event)
5303                 ASSERT_RTNL();
5304 
5305         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5306 
5307         switch (event) {
5308         case RTM_NEWADDR:
5309                 /*
5310                  * If the address was optimistic
5311                  * we inserted the route at the start of
5312                  * our DAD process, so we don't need
5313                  * to do it again
5314                  */
5315                 if (!(ifp->rt->rt6i_node))
5316                         ip6_ins_rt(ifp->rt);
5317                 if (ifp->idev->cnf.forwarding)
5318                         addrconf_join_anycast(ifp);
5319                 if (!ipv6_addr_any(&ifp->peer_addr))
5320                         addrconf_prefix_route(&ifp->peer_addr, 128,
5321                                               ifp->idev->dev, 0, 0);
5322                 break;
5323         case RTM_DELADDR:
5324                 if (ifp->idev->cnf.forwarding)
5325                         addrconf_leave_anycast(ifp);
5326                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5327                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5328                         struct rt6_info *rt;
5329 
5330                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5331                                                        ifp->idev->dev, 0, 0);
5332                         if (rt)
5333                                 ip6_del_rt(rt);
5334                 }
5335                 if (ifp->rt) {
5336                         dst_hold(&ifp->rt->dst);
5337                         ip6_del_rt(ifp->rt);
5338                 }
5339                 rt_genid_bump_ipv6(net);
5340                 break;
5341         }
5342         atomic_inc(&net->ipv6.dev_addr_genid);
5343 }
5344 
5345 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5346 {
5347         rcu_read_lock_bh();
5348         if (likely(ifp->idev->dead == 0))
5349                 __ipv6_ifa_notify(event, ifp);
5350         rcu_read_unlock_bh();
5351 }
5352 
5353 #ifdef CONFIG_SYSCTL
5354 
5355 static
5356 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5357                            void __user *buffer, size_t *lenp, loff_t *ppos)
5358 {
5359         int *valp = ctl->data;
5360         int val = *valp;
5361         loff_t pos = *ppos;
5362         struct ctl_table lctl;
5363         int ret;
5364 
5365         /*
5366          * ctl->data points to idev->cnf.forwarding, we should
5367          * not modify it until we get the rtnl lock.
5368          */
5369         lctl = *ctl;
5370         lctl.data = &val;
5371 
5372         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5373 
5374         if (write)
5375                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5376         if (ret)
5377                 *ppos = pos;
5378         return ret;
5379 }
5380 
5381 static
5382 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5383                               void __user *buffer, size_t *lenp, loff_t *ppos)
5384 {
5385         struct ctl_table lctl;
5386         int min_hl = 1, max_hl = 255;
5387 
5388         lctl = *ctl;
5389         lctl.extra1 = &min_hl;
5390         lctl.extra2 = &max_hl;
5391 
5392         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5393 }
5394 
5395 static
5396 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5397                         void __user *buffer, size_t *lenp, loff_t *ppos)
5398 {
5399         struct inet6_dev *idev = ctl->extra1;
5400         int min_mtu = IPV6_MIN_MTU;
5401         struct ctl_table lctl;
5402 
5403         lctl = *ctl;
5404         lctl.extra1 = &min_mtu;
5405         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5406 
5407         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5408 }
5409 
5410 static void dev_disable_change(struct inet6_dev *idev)
5411 {
5412         struct netdev_notifier_info info;
5413 
5414         if (!idev || !idev->dev)
5415                 return;
5416 
5417         netdev_notifier_info_init(&info, idev->dev);
5418         if (idev->cnf.disable_ipv6)
5419                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5420         else
5421                 addrconf_notify(NULL, NETDEV_UP, &info);
5422 }
5423 
5424 static void addrconf_disable_change(struct net *net, __s32 newf)
5425 {
5426         struct net_device *dev;
5427         struct inet6_dev *idev;
5428 
5429         rcu_read_lock();
5430         for_each_netdev_rcu(net, dev) {
5431                 idev = __in6_dev_get(dev);
5432                 if (idev) {
5433                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5434                         idev->cnf.disable_ipv6 = newf;
5435                         if (changed)
5436                                 dev_disable_change(idev);
5437                 }
5438         }
5439         rcu_read_unlock();
5440 }
5441 
5442 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5443 {
5444         struct net *net;
5445         int old;
5446 
5447         if (!rtnl_trylock())
5448                 return restart_syscall();
5449 
5450         net = (struct net *)table->extra2;
5451         old = *p;
5452         *p = newf;
5453 
5454         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5455                 rtnl_unlock();
5456                 return 0;
5457         }
5458 
5459         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5460                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5461                 addrconf_disable_change(net, newf);
5462         } else if ((!newf) ^ (!old))
5463                 dev_disable_change((struct inet6_dev *)table->extra1);
5464 
5465         rtnl_unlock();
5466         return 0;
5467 }
5468 
5469 static
5470 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5471                             void __user *buffer, size_t *lenp, loff_t *ppos)
5472 {
5473         int *valp = ctl->data;
5474         int val = *valp;
5475         loff_t pos = *ppos;
5476         struct ctl_table lctl;
5477         int ret;
5478 
5479         /*
5480          * ctl->data points to idev->cnf.disable_ipv6, we should
5481          * not modify it until we get the rtnl lock.
5482          */
5483         lctl = *ctl;
5484         lctl.data = &val;
5485 
5486         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5487 
5488         if (write)
5489                 ret = addrconf_disable_ipv6(ctl, valp, val);
5490         if (ret)
5491                 *ppos = pos;
5492         return ret;
5493 }
5494 
5495 static
5496 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5497                               void __user *buffer, size_t *lenp, loff_t *ppos)
5498 {
5499         int *valp = ctl->data;
5500         int ret;
5501         int old, new;
5502 
5503         old = *valp;
5504         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5505         new = *valp;
5506 
5507         if (write && old != new) {
5508                 struct net *net = ctl->extra2;
5509 
5510                 if (!rtnl_trylock())
5511                         return restart_syscall();
5512 
5513                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5514                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5515                                                      NETCONFA_IFINDEX_DEFAULT,
5516                                                      net->ipv6.devconf_dflt);
5517                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5518                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5519                                                      NETCONFA_IFINDEX_ALL,
5520                                                      net->ipv6.devconf_all);
5521                 else {
5522                         struct inet6_dev *idev = ctl->extra1;
5523 
5524                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5525                                                      idev->dev->ifindex,
5526                                                      &idev->cnf);
5527                 }
5528                 rtnl_unlock();
5529         }
5530 
5531         return ret;
5532 }
5533 
5534 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5535                                          void __user *buffer, size_t *lenp,
5536                                          loff_t *ppos)
5537 {
5538         int err;
5539         struct in6_addr addr;
5540         char str[IPV6_MAX_STRLEN];
5541         struct ctl_table lctl = *ctl;
5542         struct net *net = ctl->extra2;
5543         struct ipv6_stable_secret *secret = ctl->data;
5544 
5545         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5546                 return -EIO;
5547 
5548         lctl.maxlen = IPV6_MAX_STRLEN;
5549         lctl.data = str;
5550 
5551         if (!rtnl_trylock())
5552                 return restart_syscall();
5553 
5554         if (!write && !secret->initialized) {
5555                 err = -EIO;
5556                 goto out;
5557         }
5558 
5559         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5560         if (err >= sizeof(str)) {
5561                 err = -EIO;
5562                 goto out;
5563         }
5564 
5565         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5566         if (err || !write)
5567                 goto out;
5568 
5569         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5570                 err = -EIO;
5571                 goto out;
5572         }
5573 
5574         secret->initialized = true;
5575         secret->secret = addr;
5576 
5577         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5578                 struct net_device *dev;
5579 
5580                 for_each_netdev(net, dev) {
5581                         struct inet6_dev *idev = __in6_dev_get(dev);
5582 
5583                         if (idev) {
5584                                 idev->addr_gen_mode =
5585                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5586                         }
5587                 }
5588         } else {
5589                 struct inet6_dev *idev = ctl->extra1;
5590 
5591                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5592         }
5593 
5594 out:
5595         rtnl_unlock();
5596 
5597         return err;
5598 }
5599 
5600 static
5601 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5602                                                 int write,
5603                                                 void __user *buffer,
5604                                                 size_t *lenp,
5605                                                 loff_t *ppos)
5606 {
5607         int *valp = ctl->data;
5608         int val = *valp;
5609         loff_t pos = *ppos;
5610         struct ctl_table lctl;
5611         int ret;
5612 
5613         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5614          * we should not modify it until we get the rtnl lock.
5615          */
5616         lctl = *ctl;
5617         lctl.data = &val;
5618 
5619         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5620 
5621         if (write)
5622                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5623         if (ret)
5624                 *ppos = pos;
5625         return ret;
5626 }
5627 
5628 static const struct ctl_table addrconf_sysctl[] = {
5629         {
5630                 .procname       = "forwarding",
5631                 .data           = &ipv6_devconf.forwarding,
5632                 .maxlen         = sizeof(int),
5633                 .mode           = 0644,
5634                 .proc_handler   = addrconf_sysctl_forward,
5635         },
5636         {
5637                 .procname       = "hop_limit",
5638                 .data           = &ipv6_devconf.hop_limit,
5639                 .maxlen         = sizeof(int),
5640                 .mode           = 0644,
5641                 .proc_handler   = addrconf_sysctl_hop_limit,
5642         },
5643         {
5644                 .procname       = "mtu",
5645                 .data           = &ipv6_devconf.mtu6,
5646                 .maxlen         = sizeof(int),
5647                 .mode           = 0644,
5648                 .proc_handler   = addrconf_sysctl_mtu,
5649         },
5650         {
5651                 .procname       = "accept_ra",
5652                 .data           = &ipv6_devconf.accept_ra,
5653                 .maxlen         = sizeof(int),
5654                 .mode           = 0644,
5655                 .proc_handler   = proc_dointvec,
5656         },
5657         {
5658                 .procname       = "accept_redirects",
5659                 .data           = &ipv6_devconf.accept_redirects,
5660                 .maxlen         = sizeof(int),
5661                 .mode           = 0644,
5662                 .proc_handler   = proc_dointvec,
5663         },
5664         {
5665                 .procname       = "autoconf",
5666                 .data           = &ipv6_devconf.autoconf,
5667                 .maxlen         = sizeof(int),
5668                 .mode           = 0644,
5669                 .proc_handler   = proc_dointvec,
5670         },
5671         {
5672                 .procname       = "dad_transmits",
5673                 .data           = &ipv6_devconf.dad_transmits,
5674                 .maxlen         = sizeof(int),
5675                 .mode           = 0644,
5676                 .proc_handler   = proc_dointvec,
5677         },
5678         {
5679                 .procname       = "router_solicitations",
5680                 .data           = &ipv6_devconf.rtr_solicits,
5681                 .maxlen         = sizeof(int),
5682                 .mode           = 0644,
5683                 .proc_handler   = proc_dointvec,
5684         },
5685         {
5686                 .procname       = "router_solicitation_interval",
5687                 .data           = &ipv6_devconf.rtr_solicit_interval,
5688                 .maxlen         = sizeof(int),
5689                 .mode           = 0644,
5690                 .proc_handler   = proc_dointvec_jiffies,
5691         },
5692         {
5693                 .procname       = "router_solicitation_delay",
5694                 .data           = &ipv6_devconf.rtr_solicit_delay,
5695                 .maxlen         = sizeof(int),
5696                 .mode           = 0644,
5697                 .proc_handler   = proc_dointvec_jiffies,
5698         },
5699         {
5700                 .procname       = "force_mld_version",
5701                 .data           = &ipv6_devconf.force_mld_version,
5702                 .maxlen         = sizeof(int),
5703                 .mode           = 0644,
5704                 .proc_handler   = proc_dointvec,
5705         },
5706         {
5707                 .procname       = "mldv1_unsolicited_report_interval",
5708                 .data           =
5709                         &ipv6_devconf.mldv1_unsolicited_report_interval,
5710                 .maxlen         = sizeof(int),
5711                 .mode           = 0644,
5712                 .proc_handler   = proc_dointvec_ms_jiffies,
5713         },
5714         {
5715                 .procname       = "mldv2_unsolicited_report_interval",
5716                 .data           =
5717                         &ipv6_devconf.mldv2_unsolicited_report_interval,
5718                 .maxlen         = sizeof(int),
5719                 .mode           = 0644,
5720                 .proc_handler   = proc_dointvec_ms_jiffies,
5721         },
5722         {
5723                 .procname       = "use_tempaddr",
5724                 .data           = &ipv6_devconf.use_tempaddr,
5725                 .maxlen         = sizeof(int),
5726                 .mode           = 0644,
5727                 .proc_handler   = proc_dointvec,
5728         },
5729         {
5730                 .procname       = "temp_valid_lft",
5731                 .data           = &ipv6_devconf.temp_valid_lft,
5732                 .maxlen         = sizeof(int),
5733                 .mode           = 0644,
5734                 .proc_handler   = proc_dointvec,
5735         },
5736         {
5737                 .procname       = "temp_prefered_lft",
5738                 .data           = &ipv6_devconf.temp_prefered_lft,
5739                 .maxlen         = sizeof(int),
5740                 .mode           = 0644,
5741                 .proc_handler   = proc_dointvec,
5742         },
5743         {
5744                 .procname       = "regen_max_retry",
5745                 .data           = &ipv6_devconf.regen_max_retry,
5746                 .maxlen         = sizeof(int),
5747                 .mode           = 0644,
5748                 .proc_handler   = proc_dointvec,
5749         },
5750         {
5751                 .procname       = "max_desync_factor",
5752                 .data           = &ipv6_devconf.max_desync_factor,
5753                 .maxlen         = sizeof(int),
5754                 .mode           = 0644,
5755                 .proc_handler   = proc_dointvec,
5756         },
5757         {
5758                 .procname       = "max_addresses",
5759                 .data           = &ipv6_devconf.max_addresses,
5760                 .maxlen         = sizeof(int),
5761                 .mode           = 0644,
5762                 .proc_handler   = proc_dointvec,
5763         },
5764         {
5765                 .procname       = "accept_ra_defrtr",
5766                 .data           = &ipv6_devconf.accept_ra_defrtr,
5767                 .maxlen         = sizeof(int),
5768                 .mode           = 0644,
5769                 .proc_handler   = proc_dointvec,
5770         },
5771         {
5772                 .procname       = "accept_ra_min_hop_limit",
5773                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5774                 .maxlen         = sizeof(int),
5775                 .mode           = 0644,
5776                 .proc_handler   = proc_dointvec,
5777         },
5778         {
5779                 .procname       = "accept_ra_pinfo",
5780                 .data           = &ipv6_devconf.accept_ra_pinfo,
5781                 .maxlen         = sizeof(int),
5782                 .mode           = 0644,
5783                 .proc_handler   = proc_dointvec,
5784         },
5785 #ifdef CONFIG_IPV6_ROUTER_PREF
5786         {
5787                 .procname       = "accept_ra_rtr_pref",
5788                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
5789                 .maxlen         = sizeof(int),
5790                 .mode           = 0644,
5791                 .proc_handler   = proc_dointvec,
5792         },
5793         {
5794                 .procname       = "router_probe_interval",
5795                 .data           = &ipv6_devconf.rtr_probe_interval,
5796                 .maxlen         = sizeof(int),
5797                 .mode           = 0644,
5798                 .proc_handler   = proc_dointvec_jiffies,
5799         },
5800 #ifdef CONFIG_IPV6_ROUTE_INFO
5801         {
5802                 .procname       = "accept_ra_rt_info_max_plen",
5803                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5804                 .maxlen         = sizeof(int),
5805                 .mode           = 0644,
5806                 .proc_handler   = proc_dointvec,
5807         },
5808 #endif
5809 #endif
5810         {
5811                 .procname       = "proxy_ndp",
5812                 .data           = &ipv6_devconf.proxy_ndp,
5813                 .maxlen         = sizeof(int),
5814                 .mode           = 0644,
5815                 .proc_handler   = addrconf_sysctl_proxy_ndp,
5816         },
5817         {
5818                 .procname       = "accept_source_route",
5819                 .data           = &ipv6_devconf.accept_source_route,
5820                 .maxlen         = sizeof(int),
5821                 .mode           = 0644,
5822                 .proc_handler   = proc_dointvec,
5823         },
5824 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5825         {
5826                 .procname       = "optimistic_dad",
5827                 .data           = &ipv6_devconf.optimistic_dad,
5828                 .maxlen         = sizeof(int),
5829                 .mode           = 0644,
5830                 .proc_handler   = proc_dointvec,
5831         },
5832         {
5833                 .procname       = "use_optimistic",
5834                 .data           = &ipv6_devconf.use_optimistic,
5835                 .maxlen         = sizeof(int),
5836                 .mode           = 0644,
5837                 .proc_handler   = proc_dointvec,
5838         },
5839 #endif
5840 #ifdef CONFIG_IPV6_MROUTE
5841         {
5842                 .procname       = "mc_forwarding",
5843                 .data           = &ipv6_devconf.mc_forwarding,
5844                 .maxlen         = sizeof(int),
5845                 .mode           = 0444,
5846                 .proc_handler   = proc_dointvec,
5847         },
5848 #endif
5849         {
5850                 .procname       = "disable_ipv6",
5851                 .data           = &ipv6_devconf.disable_ipv6,
5852                 .maxlen         = sizeof(int),
5853                 .mode           = 0644,
5854                 .proc_handler   = addrconf_sysctl_disable,
5855         },
5856         {
5857                 .procname       = "accept_dad",
5858                 .data           = &ipv6_devconf.accept_dad,
5859                 .maxlen         = sizeof(int),
5860                 .mode           = 0644,
5861                 .proc_handler   = proc_dointvec,
5862         },
5863         {
5864                 .procname       = "force_tllao",
5865                 .data           = &ipv6_devconf.force_tllao,
5866                 .maxlen         = sizeof(int),
5867                 .mode           = 0644,
5868                 .proc_handler   = proc_dointvec
5869         },
5870         {
5871                 .procname       = "ndisc_notify",
5872                 .data           = &ipv6_devconf.ndisc_notify,
5873                 .maxlen         = sizeof(int),
5874                 .mode           = 0644,
5875                 .proc_handler   = proc_dointvec
5876         },
5877         {
5878                 .procname       = "suppress_frag_ndisc",
5879                 .data           = &ipv6_devconf.suppress_frag_ndisc,
5880                 .maxlen         = sizeof(int),
5881                 .mode           = 0644,
5882                 .proc_handler   = proc_dointvec
5883         },
5884         {
5885                 .procname       = "accept_ra_from_local",
5886                 .data           = &ipv6_devconf.accept_ra_from_local,
5887                 .maxlen         = sizeof(int),
5888                 .mode           = 0644,
5889                 .proc_handler   = proc_dointvec,
5890         },
5891         {
5892                 .procname       = "accept_ra_mtu",
5893                 .data           = &ipv6_devconf.accept_ra_mtu,
5894                 .maxlen         = sizeof(int),
5895                 .mode           = 0644,
5896                 .proc_handler   = proc_dointvec,
5897         },
5898         {
5899                 .procname       = "stable_secret",
5900                 .data           = &ipv6_devconf.stable_secret,
5901                 .maxlen         = IPV6_MAX_STRLEN,
5902                 .mode           = 0600,
5903                 .proc_handler   = addrconf_sysctl_stable_secret,
5904         },
5905         {
5906                 .procname       = "use_oif_addrs_only",
5907                 .data           = &ipv6_devconf.use_oif_addrs_only,
5908                 .maxlen         = sizeof(int),
5909                 .mode           = 0644,
5910                 .proc_handler   = proc_dointvec,
5911         },
5912         {
5913                 .procname       = "ignore_routes_with_linkdown",
5914                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
5915                 .maxlen         = sizeof(int),
5916                 .mode           = 0644,
5917                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
5918         },
5919         {
5920                 .procname       = "drop_unicast_in_l2_multicast",
5921                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
5922                 .maxlen         = sizeof(int),
5923                 .mode           = 0644,
5924                 .proc_handler   = proc_dointvec,
5925         },
5926         {
5927                 .procname       = "drop_unsolicited_na",
5928                 .data           = &ipv6_devconf.drop_unsolicited_na,
5929                 .maxlen         = sizeof(int),
5930                 .mode           = 0644,
5931                 .proc_handler   = proc_dointvec,
5932         },
5933         {
5934                 .procname       = "keep_addr_on_down",
5935                 .data           = &ipv6_devconf.keep_addr_on_down,
5936                 .maxlen         = sizeof(int),
5937                 .mode           = 0644,
5938                 .proc_handler   = proc_dointvec,
5939 
5940         },
5941         {
5942                 /* sentinel */
5943         }
5944 };
5945 
5946 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5947                 struct inet6_dev *idev, struct ipv6_devconf *p)
5948 {
5949         int i;
5950         struct ctl_table *table;
5951         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5952 
5953         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
5954         if (!table)
5955                 goto out;
5956 
5957         for (i = 0; table[i].data; i++) {
5958                 table[i].data += (char *)p - (char *)&ipv6_devconf;
5959                 table[i].extra1 = idev; /* embedded; no ref */
5960                 table[i].extra2 = net;
5961         }
5962 
5963         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5964 
5965         p->sysctl_header = register_net_sysctl(net, path, table);
5966         if (!p->sysctl_header)
5967                 goto free;
5968 
5969         return 0;
5970 
5971 free:
5972         kfree(table);
5973 out:
5974         return -ENOBUFS;
5975 }
5976 
5977 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5978 {
5979         struct ctl_table *table;
5980 
5981         if (!p->sysctl_header)
5982                 return;
5983 
5984         table = p->sysctl_header->ctl_table_arg;
5985         unregister_net_sysctl_table(p->sysctl_header);
5986         p->sysctl_header = NULL;
5987         kfree(table);
5988 }
5989 
5990 static int addrconf_sysctl_register(struct inet6_dev *idev)
5991 {
5992         int err;
5993 
5994         if (!sysctl_dev_name_is_allowed(idev->dev->name))
5995                 return -EINVAL;
5996 
5997         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5998                                     &ndisc_ifinfo_sysctl_change);
5999         if (err)
6000                 return err;
6001         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6002                                          idev, &idev->cnf);
6003         if (err)
6004                 neigh_sysctl_unregister(idev->nd_parms);
6005 
6006         return err;
6007 }
6008 
6009 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6010 {
6011         __addrconf_sysctl_unregister(&idev->cnf);
6012         neigh_sysctl_unregister(idev->nd_parms);
6013 }
6014 
6015 
6016 #endif
6017 
6018 static int __net_init addrconf_init_net(struct net *net)
6019 {
6020         int err = -ENOMEM;
6021         struct ipv6_devconf *all, *dflt;
6022 
6023         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6024         if (!all)
6025                 goto err_alloc_all;
6026 
6027         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6028         if (!dflt)
6029                 goto err_alloc_dflt;
6030 
6031         /* these will be inherited by all namespaces */
6032         dflt->autoconf = ipv6_defaults.autoconf;
6033         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6034 
6035         dflt->stable_secret.initialized = false;
6036         all->stable_secret.initialized = false;
6037 
6038         net->ipv6.devconf_all = all;
6039         net->ipv6.devconf_dflt = dflt;
6040 
6041 #ifdef CONFIG_SYSCTL
6042         err = __addrconf_sysctl_register(net, "all", NULL, all);
6043         if (err < 0)
6044                 goto err_reg_all;
6045 
6046         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6047         if (err < 0)
6048                 goto err_reg_dflt;
6049 #endif
6050         return 0;
6051 
6052 #ifdef CONFIG_SYSCTL
6053 err_reg_dflt:
6054         __addrconf_sysctl_unregister(all);
6055 err_reg_all:
6056         kfree(dflt);
6057 #endif
6058 err_alloc_dflt:
6059         kfree(all);
6060 err_alloc_all:
6061         return err;
6062 }
6063 
6064 static void __net_exit addrconf_exit_net(struct net *net)
6065 {
6066 #ifdef CONFIG_SYSCTL
6067         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6068         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6069 #endif
6070         kfree(net->ipv6.devconf_dflt);
6071         kfree(net->ipv6.devconf_all);
6072 }
6073 
6074 static struct pernet_operations addrconf_ops = {
6075         .init = addrconf_init_net,
6076         .exit = addrconf_exit_net,
6077 };
6078 
6079 static struct rtnl_af_ops inet6_ops __read_mostly = {
6080         .family           = AF_INET6,
6081         .fill_link_af     = inet6_fill_link_af,
6082         .get_link_af_size = inet6_get_link_af_size,
6083         .validate_link_af = inet6_validate_link_af,
6084         .set_link_af      = inet6_set_link_af,
6085 };
6086 
6087 /*
6088  *      Init / cleanup code
6089  */
6090 
6091 int __init addrconf_init(void)
6092 {
6093         struct inet6_dev *idev;
6094         int i, err;
6095 
6096         err = ipv6_addr_label_init();
6097         if (err < 0) {
6098                 pr_crit("%s: cannot initialize default policy table: %d\n",
6099                         __func__, err);
6100                 goto out;
6101         }
6102 
6103         err = register_pernet_subsys(&addrconf_ops);
6104         if (err < 0)
6105                 goto out_addrlabel;
6106 
6107         addrconf_wq = create_workqueue("ipv6_addrconf");
6108         if (!addrconf_wq) {
6109                 err = -ENOMEM;
6110                 goto out_nowq;
6111         }
6112 
6113         /* The addrconf netdev notifier requires that loopback_dev
6114          * has it's ipv6 private information allocated and setup
6115          * before it can bring up and give link-local addresses
6116          * to other devices which are up.
6117          *
6118          * Unfortunately, loopback_dev is not necessarily the first
6119          * entry in the global dev_base list of net devices.  In fact,
6120          * it is likely to be the very last entry on that list.
6121          * So this causes the notifier registry below to try and
6122          * give link-local addresses to all devices besides loopback_dev
6123          * first, then loopback_dev, which cases all the non-loopback_dev
6124          * devices to fail to get a link-local address.