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

Version: ~ [ linux-5.12 ] ~ [ linux-5.11.16 ] ~ [ linux-5.10.32 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.114 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.188 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.231 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.267 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.267 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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, bool bump_id);
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_KERNEL);
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_KERNEL);
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                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
782 
783                 net->ipv6.devconf_dflt->forwarding = newf;
784                 if ((!newf) ^ (!old_dflt))
785                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
786                                                      NETCONFA_IFINDEX_DEFAULT,
787                                                      net->ipv6.devconf_dflt);
788 
789                 addrconf_forward_change(net, newf);
790                 if ((!newf) ^ (!old))
791                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
792                                                      NETCONFA_IFINDEX_ALL,
793                                                      net->ipv6.devconf_all);
794         } else if ((!newf) ^ (!old))
795                 dev_forward_change((struct inet6_dev *)table->extra1);
796         rtnl_unlock();
797 
798         if (newf)
799                 rt6_purge_dflt_routers(net);
800         return 1;
801 }
802 
803 static void addrconf_linkdown_change(struct net *net, __s32 newf)
804 {
805         struct net_device *dev;
806         struct inet6_dev *idev;
807 
808         for_each_netdev(net, dev) {
809                 idev = __in6_dev_get(dev);
810                 if (idev) {
811                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
812 
813                         idev->cnf.ignore_routes_with_linkdown = newf;
814                         if (changed)
815                                 inet6_netconf_notify_devconf(dev_net(dev),
816                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
817                                                              dev->ifindex,
818                                                              &idev->cnf);
819                 }
820         }
821 }
822 
823 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
824 {
825         struct net *net;
826         int old;
827 
828         if (!rtnl_trylock())
829                 return restart_syscall();
830 
831         net = (struct net *)table->extra2;
832         old = *p;
833         *p = newf;
834 
835         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
836                 if ((!newf) ^ (!old))
837                         inet6_netconf_notify_devconf(net,
838                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
839                                                      NETCONFA_IFINDEX_DEFAULT,
840                                                      net->ipv6.devconf_dflt);
841                 rtnl_unlock();
842                 return 0;
843         }
844 
845         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
846                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
847                 addrconf_linkdown_change(net, newf);
848                 if ((!newf) ^ (!old))
849                         inet6_netconf_notify_devconf(net,
850                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
851                                                      NETCONFA_IFINDEX_ALL,
852                                                      net->ipv6.devconf_all);
853         }
854         rtnl_unlock();
855 
856         return 1;
857 }
858 
859 #endif
860 
861 /* Nobody refers to this ifaddr, destroy it */
862 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
863 {
864         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
865 
866 #ifdef NET_REFCNT_DEBUG
867         pr_debug("%s\n", __func__);
868 #endif
869 
870         in6_dev_put(ifp->idev);
871 
872         if (cancel_delayed_work(&ifp->dad_work))
873                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
874                           ifp);
875 
876         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
877                 pr_warn("Freeing alive inet6 address %p\n", ifp);
878                 return;
879         }
880         ip6_rt_put(ifp->rt);
881 
882         kfree_rcu(ifp, rcu);
883 }
884 
885 static void
886 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
887 {
888         struct list_head *p;
889         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
890 
891         /*
892          * Each device address list is sorted in order of scope -
893          * global before linklocal.
894          */
895         list_for_each(p, &idev->addr_list) {
896                 struct inet6_ifaddr *ifa
897                         = list_entry(p, struct inet6_ifaddr, if_list);
898                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
899                         break;
900         }
901 
902         list_add_tail(&ifp->if_list, p);
903 }
904 
905 static u32 inet6_addr_hash(const struct in6_addr *addr)
906 {
907         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
908 }
909 
910 /* On success it returns ifp with increased reference count */
911 
912 static struct inet6_ifaddr *
913 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
914               const struct in6_addr *peer_addr, int pfxlen,
915               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
916 {
917         struct inet6_ifaddr *ifa = NULL;
918         struct rt6_info *rt;
919         unsigned int hash;
920         int err = 0;
921         int addr_type = ipv6_addr_type(addr);
922 
923         if (addr_type == IPV6_ADDR_ANY ||
924             addr_type & IPV6_ADDR_MULTICAST ||
925             (!(idev->dev->flags & IFF_LOOPBACK) &&
926              addr_type & IPV6_ADDR_LOOPBACK))
927                 return ERR_PTR(-EADDRNOTAVAIL);
928 
929         rcu_read_lock_bh();
930         if (idev->dead) {
931                 err = -ENODEV;                  /*XXX*/
932                 goto out2;
933         }
934 
935         if (idev->cnf.disable_ipv6) {
936                 err = -EACCES;
937                 goto out2;
938         }
939 
940         spin_lock(&addrconf_hash_lock);
941 
942         /* Ignore adding duplicate addresses on an interface */
943         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
944                 ADBG("ipv6_add_addr: already assigned\n");
945                 err = -EEXIST;
946                 goto out;
947         }
948 
949         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
950 
951         if (!ifa) {
952                 ADBG("ipv6_add_addr: malloc failed\n");
953                 err = -ENOBUFS;
954                 goto out;
955         }
956 
957         rt = addrconf_dst_alloc(idev, addr, false);
958         if (IS_ERR(rt)) {
959                 err = PTR_ERR(rt);
960                 goto out;
961         }
962 
963         neigh_parms_data_state_setall(idev->nd_parms);
964 
965         ifa->addr = *addr;
966         if (peer_addr)
967                 ifa->peer_addr = *peer_addr;
968 
969         spin_lock_init(&ifa->lock);
970         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
971         INIT_HLIST_NODE(&ifa->addr_lst);
972         ifa->scope = scope;
973         ifa->prefix_len = pfxlen;
974         ifa->flags = flags | IFA_F_TENTATIVE;
975         ifa->valid_lft = valid_lft;
976         ifa->prefered_lft = prefered_lft;
977         ifa->cstamp = ifa->tstamp = jiffies;
978         ifa->tokenized = false;
979 
980         ifa->rt = rt;
981 
982         ifa->idev = idev;
983         in6_dev_hold(idev);
984         /* For caller */
985         in6_ifa_hold(ifa);
986 
987         /* Add to big hash table */
988         hash = inet6_addr_hash(addr);
989 
990         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
991         spin_unlock(&addrconf_hash_lock);
992 
993         write_lock(&idev->lock);
994         /* Add to inet6_dev unicast addr list. */
995         ipv6_link_dev_addr(idev, ifa);
996 
997         if (ifa->flags&IFA_F_TEMPORARY) {
998                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
999                 in6_ifa_hold(ifa);
1000         }
1001 
1002         in6_ifa_hold(ifa);
1003         write_unlock(&idev->lock);
1004 out2:
1005         rcu_read_unlock_bh();
1006 
1007         if (likely(err == 0))
1008                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1009         else {
1010                 kfree(ifa);
1011                 ifa = ERR_PTR(err);
1012         }
1013 
1014         return ifa;
1015 out:
1016         spin_unlock(&addrconf_hash_lock);
1017         goto out2;
1018 }
1019 
1020 enum cleanup_prefix_rt_t {
1021         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1022         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1023         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1024 };
1025 
1026 /*
1027  * Check, whether the prefix for ifp would still need a prefix route
1028  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1029  * constants.
1030  *
1031  * 1) we don't purge prefix if address was not permanent.
1032  *    prefix is managed by its own lifetime.
1033  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1034  * 3) if there are no addresses, delete prefix.
1035  * 4) if there are still other permanent address(es),
1036  *    corresponding prefix is still permanent.
1037  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1038  *    don't purge the prefix, assume user space is managing it.
1039  * 6) otherwise, update prefix lifetime to the
1040  *    longest valid lifetime among the corresponding
1041  *    addresses on the device.
1042  *    Note: subsequent RA will update lifetime.
1043  **/
1044 static enum cleanup_prefix_rt_t
1045 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1046 {
1047         struct inet6_ifaddr *ifa;
1048         struct inet6_dev *idev = ifp->idev;
1049         unsigned long lifetime;
1050         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1051 
1052         *expires = jiffies;
1053 
1054         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1055                 if (ifa == ifp)
1056                         continue;
1057                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1058                                        ifp->prefix_len))
1059                         continue;
1060                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1061                         return CLEANUP_PREFIX_RT_NOP;
1062 
1063                 action = CLEANUP_PREFIX_RT_EXPIRE;
1064 
1065                 spin_lock(&ifa->lock);
1066 
1067                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1068                 /*
1069                  * Note: Because this address is
1070                  * not permanent, lifetime <
1071                  * LONG_MAX / HZ here.
1072                  */
1073                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1074                         *expires = ifa->tstamp + lifetime * HZ;
1075                 spin_unlock(&ifa->lock);
1076         }
1077 
1078         return action;
1079 }
1080 
1081 static void
1082 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1083 {
1084         struct rt6_info *rt;
1085 
1086         rt = addrconf_get_prefix_route(&ifp->addr,
1087                                        ifp->prefix_len,
1088                                        ifp->idev->dev,
1089                                        0, RTF_GATEWAY | RTF_DEFAULT);
1090         if (rt) {
1091                 if (del_rt)
1092                         ip6_del_rt(rt);
1093                 else {
1094                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1095                                 rt6_set_expires(rt, expires);
1096                         ip6_rt_put(rt);
1097                 }
1098         }
1099 }
1100 
1101 
1102 /* This function wants to get referenced ifp and releases it before return */
1103 
1104 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1105 {
1106         int state;
1107         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1108         unsigned long expires;
1109 
1110         ASSERT_RTNL();
1111 
1112         spin_lock_bh(&ifp->lock);
1113         state = ifp->state;
1114         ifp->state = INET6_IFADDR_STATE_DEAD;
1115         spin_unlock_bh(&ifp->lock);
1116 
1117         if (state == INET6_IFADDR_STATE_DEAD)
1118                 goto out;
1119 
1120         spin_lock_bh(&addrconf_hash_lock);
1121         hlist_del_init_rcu(&ifp->addr_lst);
1122         spin_unlock_bh(&addrconf_hash_lock);
1123 
1124         write_lock_bh(&ifp->idev->lock);
1125 
1126         if (ifp->flags&IFA_F_TEMPORARY) {
1127                 list_del(&ifp->tmp_list);
1128                 if (ifp->ifpub) {
1129                         in6_ifa_put(ifp->ifpub);
1130                         ifp->ifpub = NULL;
1131                 }
1132                 __in6_ifa_put(ifp);
1133         }
1134 
1135         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1136                 action = check_cleanup_prefix_route(ifp, &expires);
1137 
1138         list_del_init(&ifp->if_list);
1139         __in6_ifa_put(ifp);
1140 
1141         write_unlock_bh(&ifp->idev->lock);
1142 
1143         addrconf_del_dad_work(ifp);
1144 
1145         ipv6_ifa_notify(RTM_DELADDR, ifp);
1146 
1147         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1148 
1149         if (action != CLEANUP_PREFIX_RT_NOP) {
1150                 cleanup_prefix_route(ifp, expires,
1151                         action == CLEANUP_PREFIX_RT_DEL);
1152         }
1153 
1154         /* clean up prefsrc entries */
1155         rt6_remove_prefsrc(ifp);
1156 out:
1157         in6_ifa_put(ifp);
1158 }
1159 
1160 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1161 {
1162         struct inet6_dev *idev = ifp->idev;
1163         struct in6_addr addr, *tmpaddr;
1164         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1165         unsigned long regen_advance;
1166         int tmp_plen;
1167         int ret = 0;
1168         u32 addr_flags;
1169         unsigned long now = jiffies;
1170 
1171         write_lock_bh(&idev->lock);
1172         if (ift) {
1173                 spin_lock_bh(&ift->lock);
1174                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1175                 spin_unlock_bh(&ift->lock);
1176                 tmpaddr = &addr;
1177         } else {
1178                 tmpaddr = NULL;
1179         }
1180 retry:
1181         in6_dev_hold(idev);
1182         if (idev->cnf.use_tempaddr <= 0) {
1183                 write_unlock_bh(&idev->lock);
1184                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1185                 in6_dev_put(idev);
1186                 ret = -1;
1187                 goto out;
1188         }
1189         spin_lock_bh(&ifp->lock);
1190         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1191                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1192                 spin_unlock_bh(&ifp->lock);
1193                 write_unlock_bh(&idev->lock);
1194                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1195                         __func__);
1196                 in6_dev_put(idev);
1197                 ret = -1;
1198                 goto out;
1199         }
1200         in6_ifa_hold(ifp);
1201         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1202         __ipv6_try_regen_rndid(idev, tmpaddr);
1203         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1204         age = (now - ifp->tstamp) / HZ;
1205         tmp_valid_lft = min_t(__u32,
1206                               ifp->valid_lft,
1207                               idev->cnf.temp_valid_lft + age);
1208         tmp_prefered_lft = min_t(__u32,
1209                                  ifp->prefered_lft,
1210                                  idev->cnf.temp_prefered_lft + age -
1211                                  idev->cnf.max_desync_factor);
1212         tmp_plen = ifp->prefix_len;
1213         tmp_tstamp = ifp->tstamp;
1214         spin_unlock_bh(&ifp->lock);
1215 
1216         regen_advance = idev->cnf.regen_max_retry *
1217                         idev->cnf.dad_transmits *
1218                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1219         write_unlock_bh(&idev->lock);
1220 
1221         /* A temporary address is created only if this calculated Preferred
1222          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1223          * an implementation must not create a temporary address with a zero
1224          * Preferred Lifetime.
1225          * Use age calculation as in addrconf_verify to avoid unnecessary
1226          * temporary addresses being generated.
1227          */
1228         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1229         if (tmp_prefered_lft <= regen_advance + age) {
1230                 in6_ifa_put(ifp);
1231                 in6_dev_put(idev);
1232                 ret = -1;
1233                 goto out;
1234         }
1235 
1236         addr_flags = IFA_F_TEMPORARY;
1237         /* set in addrconf_prefix_rcv() */
1238         if (ifp->flags & IFA_F_OPTIMISTIC)
1239                 addr_flags |= IFA_F_OPTIMISTIC;
1240 
1241         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1242                             ipv6_addr_scope(&addr), addr_flags,
1243                             tmp_valid_lft, tmp_prefered_lft);
1244         if (IS_ERR(ift)) {
1245                 in6_ifa_put(ifp);
1246                 in6_dev_put(idev);
1247                 pr_info("%s: retry temporary address regeneration\n", __func__);
1248                 tmpaddr = &addr;
1249                 write_lock_bh(&idev->lock);
1250                 goto retry;
1251         }
1252 
1253         spin_lock_bh(&ift->lock);
1254         ift->ifpub = ifp;
1255         ift->cstamp = now;
1256         ift->tstamp = tmp_tstamp;
1257         spin_unlock_bh(&ift->lock);
1258 
1259         addrconf_dad_start(ift);
1260         in6_ifa_put(ift);
1261         in6_dev_put(idev);
1262 out:
1263         return ret;
1264 }
1265 
1266 /*
1267  *      Choose an appropriate source address (RFC3484)
1268  */
1269 enum {
1270         IPV6_SADDR_RULE_INIT = 0,
1271         IPV6_SADDR_RULE_LOCAL,
1272         IPV6_SADDR_RULE_SCOPE,
1273         IPV6_SADDR_RULE_PREFERRED,
1274 #ifdef CONFIG_IPV6_MIP6
1275         IPV6_SADDR_RULE_HOA,
1276 #endif
1277         IPV6_SADDR_RULE_OIF,
1278         IPV6_SADDR_RULE_LABEL,
1279         IPV6_SADDR_RULE_PRIVACY,
1280         IPV6_SADDR_RULE_ORCHID,
1281         IPV6_SADDR_RULE_PREFIX,
1282 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1283         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1284 #endif
1285         IPV6_SADDR_RULE_MAX
1286 };
1287 
1288 struct ipv6_saddr_score {
1289         int                     rule;
1290         int                     addr_type;
1291         struct inet6_ifaddr     *ifa;
1292         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1293         int                     scopedist;
1294         int                     matchlen;
1295 };
1296 
1297 struct ipv6_saddr_dst {
1298         const struct in6_addr *addr;
1299         int ifindex;
1300         int scope;
1301         int label;
1302         unsigned int prefs;
1303 };
1304 
1305 static inline int ipv6_saddr_preferred(int type)
1306 {
1307         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1308                 return 1;
1309         return 0;
1310 }
1311 
1312 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1313 {
1314 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1315         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1316 #else
1317         return false;
1318 #endif
1319 }
1320 
1321 static int ipv6_get_saddr_eval(struct net *net,
1322                                struct ipv6_saddr_score *score,
1323                                struct ipv6_saddr_dst *dst,
1324                                int i)
1325 {
1326         int ret;
1327 
1328         if (i <= score->rule) {
1329                 switch (i) {
1330                 case IPV6_SADDR_RULE_SCOPE:
1331                         ret = score->scopedist;
1332                         break;
1333                 case IPV6_SADDR_RULE_PREFIX:
1334                         ret = score->matchlen;
1335                         break;
1336                 default:
1337                         ret = !!test_bit(i, score->scorebits);
1338                 }
1339                 goto out;
1340         }
1341 
1342         switch (i) {
1343         case IPV6_SADDR_RULE_INIT:
1344                 /* Rule 0: remember if hiscore is not ready yet */
1345                 ret = !!score->ifa;
1346                 break;
1347         case IPV6_SADDR_RULE_LOCAL:
1348                 /* Rule 1: Prefer same address */
1349                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1350                 break;
1351         case IPV6_SADDR_RULE_SCOPE:
1352                 /* Rule 2: Prefer appropriate scope
1353                  *
1354                  *      ret
1355                  *       ^
1356                  *    -1 |  d 15
1357                  *    ---+--+-+---> scope
1358                  *       |
1359                  *       |             d is scope of the destination.
1360                  *  B-d  |  \
1361                  *       |   \      <- smaller scope is better if
1362                  *  B-15 |    \        if scope is enough for destination.
1363                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1364                  * d-C-1 | /
1365                  *       |/         <- greater is better
1366                  *   -C  /             if scope is not enough for destination.
1367                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1368                  *
1369                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1370                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1371                  * Assume B = 0 and we get C > 29.
1372                  */
1373                 ret = __ipv6_addr_src_scope(score->addr_type);
1374                 if (ret >= dst->scope)
1375                         ret = -ret;
1376                 else
1377                         ret -= 128;     /* 30 is enough */
1378                 score->scopedist = ret;
1379                 break;
1380         case IPV6_SADDR_RULE_PREFERRED:
1381             {
1382                 /* Rule 3: Avoid deprecated and optimistic addresses */
1383                 u8 avoid = IFA_F_DEPRECATED;
1384 
1385                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1386                         avoid |= IFA_F_OPTIMISTIC;
1387                 ret = ipv6_saddr_preferred(score->addr_type) ||
1388                       !(score->ifa->flags & avoid);
1389                 break;
1390             }
1391 #ifdef CONFIG_IPV6_MIP6
1392         case IPV6_SADDR_RULE_HOA:
1393             {
1394                 /* Rule 4: Prefer home address */
1395                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1396                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1397                 break;
1398             }
1399 #endif
1400         case IPV6_SADDR_RULE_OIF:
1401                 /* Rule 5: Prefer outgoing interface */
1402                 ret = (!dst->ifindex ||
1403                        dst->ifindex == score->ifa->idev->dev->ifindex);
1404                 break;
1405         case IPV6_SADDR_RULE_LABEL:
1406                 /* Rule 6: Prefer matching label */
1407                 ret = ipv6_addr_label(net,
1408                                       &score->ifa->addr, score->addr_type,
1409                                       score->ifa->idev->dev->ifindex) == dst->label;
1410                 break;
1411         case IPV6_SADDR_RULE_PRIVACY:
1412             {
1413                 /* Rule 7: Prefer public address
1414                  * Note: prefer temporary address if use_tempaddr >= 2
1415                  */
1416                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1417                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1418                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1419                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1420                 break;
1421             }
1422         case IPV6_SADDR_RULE_ORCHID:
1423                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1424                  *          non-ORCHID vs non-ORCHID
1425                  */
1426                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1427                         ipv6_addr_orchid(dst->addr));
1428                 break;
1429         case IPV6_SADDR_RULE_PREFIX:
1430                 /* Rule 8: Use longest matching prefix */
1431                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1432                 if (ret > score->ifa->prefix_len)
1433                         ret = score->ifa->prefix_len;
1434                 score->matchlen = ret;
1435                 break;
1436 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1437         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1438                 /* Optimistic addresses still have lower precedence than other
1439                  * preferred addresses.
1440                  */
1441                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1442                 break;
1443 #endif
1444         default:
1445                 ret = 0;
1446         }
1447 
1448         if (ret)
1449                 __set_bit(i, score->scorebits);
1450         score->rule = i;
1451 out:
1452         return ret;
1453 }
1454 
1455 static int __ipv6_dev_get_saddr(struct net *net,
1456                                 struct ipv6_saddr_dst *dst,
1457                                 struct inet6_dev *idev,
1458                                 struct ipv6_saddr_score *scores,
1459                                 int hiscore_idx)
1460 {
1461         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1462 
1463         read_lock_bh(&idev->lock);
1464         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1465                 int i;
1466 
1467                 /*
1468                  * - Tentative Address (RFC2462 section 5.4)
1469                  *  - A tentative address is not considered
1470                  *    "assigned to an interface" in the traditional
1471                  *    sense, unless it is also flagged as optimistic.
1472                  * - Candidate Source Address (section 4)
1473                  *  - In any case, anycast addresses, multicast
1474                  *    addresses, and the unspecified address MUST
1475                  *    NOT be included in a candidate set.
1476                  */
1477                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1478                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1479                         continue;
1480 
1481                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1482 
1483                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1484                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1485                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1486                                             idev->dev->name);
1487                         continue;
1488                 }
1489 
1490                 score->rule = -1;
1491                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1492 
1493                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1494                         int minihiscore, miniscore;
1495 
1496                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1497                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1498 
1499                         if (minihiscore > miniscore) {
1500                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1501                                     score->scopedist > 0) {
1502                                         /*
1503                                          * special case:
1504                                          * each remaining entry
1505                                          * has too small (not enough)
1506                                          * scope, because ifa entries
1507                                          * are sorted by their scope
1508                                          * values.
1509                                          */
1510                                         goto out;
1511                                 }
1512                                 break;
1513                         } else if (minihiscore < miniscore) {
1514                                 if (hiscore->ifa)
1515                                         in6_ifa_put(hiscore->ifa);
1516 
1517                                 in6_ifa_hold(score->ifa);
1518 
1519                                 swap(hiscore, score);
1520                                 hiscore_idx = 1 - hiscore_idx;
1521 
1522                                 /* restore our iterator */
1523                                 score->ifa = hiscore->ifa;
1524 
1525                                 break;
1526                         }
1527                 }
1528         }
1529 out:
1530         read_unlock_bh(&idev->lock);
1531         return hiscore_idx;
1532 }
1533 
1534 static int ipv6_get_saddr_master(struct net *net,
1535                                  const struct net_device *dst_dev,
1536                                  const struct net_device *master,
1537                                  struct ipv6_saddr_dst *dst,
1538                                  struct ipv6_saddr_score *scores,
1539                                  int hiscore_idx)
1540 {
1541         struct inet6_dev *idev;
1542 
1543         idev = __in6_dev_get(dst_dev);
1544         if (idev)
1545                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1546                                                    scores, hiscore_idx);
1547 
1548         idev = __in6_dev_get(master);
1549         if (idev)
1550                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1551                                                    scores, hiscore_idx);
1552 
1553         return hiscore_idx;
1554 }
1555 
1556 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1557                        const struct in6_addr *daddr, unsigned int prefs,
1558                        struct in6_addr *saddr)
1559 {
1560         struct ipv6_saddr_score scores[2], *hiscore;
1561         struct ipv6_saddr_dst dst;
1562         struct inet6_dev *idev;
1563         struct net_device *dev;
1564         int dst_type;
1565         bool use_oif_addr = false;
1566         int hiscore_idx = 0;
1567 
1568         dst_type = __ipv6_addr_type(daddr);
1569         dst.addr = daddr;
1570         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1571         dst.scope = __ipv6_addr_src_scope(dst_type);
1572         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1573         dst.prefs = prefs;
1574 
1575         scores[hiscore_idx].rule = -1;
1576         scores[hiscore_idx].ifa = NULL;
1577 
1578         rcu_read_lock();
1579 
1580         /* Candidate Source Address (section 4)
1581          *  - multicast and link-local destination address,
1582          *    the set of candidate source address MUST only
1583          *    include addresses assigned to interfaces
1584          *    belonging to the same link as the outgoing
1585          *    interface.
1586          * (- For site-local destination addresses, the
1587          *    set of candidate source addresses MUST only
1588          *    include addresses assigned to interfaces
1589          *    belonging to the same site as the outgoing
1590          *    interface.)
1591          *  - "It is RECOMMENDED that the candidate source addresses
1592          *    be the set of unicast addresses assigned to the
1593          *    interface that will be used to send to the destination
1594          *    (the 'outgoing' interface)." (RFC 6724)
1595          */
1596         if (dst_dev) {
1597                 idev = __in6_dev_get(dst_dev);
1598                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1599                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1600                     (idev && idev->cnf.use_oif_addrs_only)) {
1601                         use_oif_addr = true;
1602                 }
1603         }
1604 
1605         if (use_oif_addr) {
1606                 if (idev)
1607                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1608         } else {
1609                 const struct net_device *master;
1610                 int master_idx = 0;
1611 
1612                 /* if dst_dev exists and is enslaved to an L3 device, then
1613                  * prefer addresses from dst_dev and then the master over
1614                  * any other enslaved devices in the L3 domain.
1615                  */
1616                 master = l3mdev_master_dev_rcu(dst_dev);
1617                 if (master) {
1618                         master_idx = master->ifindex;
1619 
1620                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1621                                                             master, &dst,
1622                                                             scores, hiscore_idx);
1623 
1624                         if (scores[hiscore_idx].ifa)
1625                                 goto out;
1626                 }
1627 
1628                 for_each_netdev_rcu(net, dev) {
1629                         /* only consider addresses on devices in the
1630                          * same L3 domain
1631                          */
1632                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1633                                 continue;
1634                         idev = __in6_dev_get(dev);
1635                         if (!idev)
1636                                 continue;
1637                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1638                 }
1639         }
1640 
1641 out:
1642         rcu_read_unlock();
1643 
1644         hiscore = &scores[hiscore_idx];
1645         if (!hiscore->ifa)
1646                 return -EADDRNOTAVAIL;
1647 
1648         *saddr = hiscore->ifa->addr;
1649         in6_ifa_put(hiscore->ifa);
1650         return 0;
1651 }
1652 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1653 
1654 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1655                       u32 banned_flags)
1656 {
1657         struct inet6_ifaddr *ifp;
1658         int err = -EADDRNOTAVAIL;
1659 
1660         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1661                 if (ifp->scope > IFA_LINK)
1662                         break;
1663                 if (ifp->scope == IFA_LINK &&
1664                     !(ifp->flags & banned_flags)) {
1665                         *addr = ifp->addr;
1666                         err = 0;
1667                         break;
1668                 }
1669         }
1670         return err;
1671 }
1672 
1673 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1674                     u32 banned_flags)
1675 {
1676         struct inet6_dev *idev;
1677         int err = -EADDRNOTAVAIL;
1678 
1679         rcu_read_lock();
1680         idev = __in6_dev_get(dev);
1681         if (idev) {
1682                 read_lock_bh(&idev->lock);
1683                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1684                 read_unlock_bh(&idev->lock);
1685         }
1686         rcu_read_unlock();
1687         return err;
1688 }
1689 
1690 static int ipv6_count_addresses(struct inet6_dev *idev)
1691 {
1692         int cnt = 0;
1693         struct inet6_ifaddr *ifp;
1694 
1695         read_lock_bh(&idev->lock);
1696         list_for_each_entry(ifp, &idev->addr_list, if_list)
1697                 cnt++;
1698         read_unlock_bh(&idev->lock);
1699         return cnt;
1700 }
1701 
1702 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1703                   const struct net_device *dev, int strict)
1704 {
1705         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1706 }
1707 EXPORT_SYMBOL(ipv6_chk_addr);
1708 
1709 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1710                             const struct net_device *dev, int strict,
1711                             u32 banned_flags)
1712 {
1713         struct inet6_ifaddr *ifp;
1714         unsigned int hash = inet6_addr_hash(addr);
1715         u32 ifp_flags;
1716 
1717         rcu_read_lock_bh();
1718         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1719                 if (!net_eq(dev_net(ifp->idev->dev), net))
1720                         continue;
1721                 /* Decouple optimistic from tentative for evaluation here.
1722                  * Ban optimistic addresses explicitly, when required.
1723                  */
1724                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1725                             ? (ifp->flags&~IFA_F_TENTATIVE)
1726                             : ifp->flags;
1727                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1728                     !(ifp_flags&banned_flags) &&
1729                     (!dev || ifp->idev->dev == dev ||
1730                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1731                         rcu_read_unlock_bh();
1732                         return 1;
1733                 }
1734         }
1735 
1736         rcu_read_unlock_bh();
1737         return 0;
1738 }
1739 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1740 
1741 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1742                                struct net_device *dev)
1743 {
1744         unsigned int hash = inet6_addr_hash(addr);
1745         struct inet6_ifaddr *ifp;
1746 
1747         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1748                 if (!net_eq(dev_net(ifp->idev->dev), net))
1749                         continue;
1750                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1751                         if (!dev || ifp->idev->dev == dev)
1752                                 return true;
1753                 }
1754         }
1755         return false;
1756 }
1757 
1758 /* Compares an address/prefix_len with addresses on device @dev.
1759  * If one is found it returns true.
1760  */
1761 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1762         const unsigned int prefix_len, struct net_device *dev)
1763 {
1764         struct inet6_dev *idev;
1765         struct inet6_ifaddr *ifa;
1766         bool ret = false;
1767 
1768         rcu_read_lock();
1769         idev = __in6_dev_get(dev);
1770         if (idev) {
1771                 read_lock_bh(&idev->lock);
1772                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1773                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1774                         if (ret)
1775                                 break;
1776                 }
1777                 read_unlock_bh(&idev->lock);
1778         }
1779         rcu_read_unlock();
1780 
1781         return ret;
1782 }
1783 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1784 
1785 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1786 {
1787         struct inet6_dev *idev;
1788         struct inet6_ifaddr *ifa;
1789         int     onlink;
1790 
1791         onlink = 0;
1792         rcu_read_lock();
1793         idev = __in6_dev_get(dev);
1794         if (idev) {
1795                 read_lock_bh(&idev->lock);
1796                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1797                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1798                                                    ifa->prefix_len);
1799                         if (onlink)
1800                                 break;
1801                 }
1802                 read_unlock_bh(&idev->lock);
1803         }
1804         rcu_read_unlock();
1805         return onlink;
1806 }
1807 EXPORT_SYMBOL(ipv6_chk_prefix);
1808 
1809 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1810                                      struct net_device *dev, int strict)
1811 {
1812         struct inet6_ifaddr *ifp, *result = NULL;
1813         unsigned int hash = inet6_addr_hash(addr);
1814 
1815         rcu_read_lock_bh();
1816         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1817                 if (!net_eq(dev_net(ifp->idev->dev), net))
1818                         continue;
1819                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1820                         if (!dev || ifp->idev->dev == dev ||
1821                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1822                                 result = ifp;
1823                                 in6_ifa_hold(ifp);
1824                                 break;
1825                         }
1826                 }
1827         }
1828         rcu_read_unlock_bh();
1829 
1830         return result;
1831 }
1832 
1833 /* Gets referenced address, destroys ifaddr */
1834 
1835 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1836 {
1837         if (dad_failed)
1838                 ifp->flags |= IFA_F_DADFAILED;
1839 
1840         if (ifp->flags&IFA_F_PERMANENT) {
1841                 spin_lock_bh(&ifp->lock);
1842                 addrconf_del_dad_work(ifp);
1843                 ifp->flags |= IFA_F_TENTATIVE;
1844                 spin_unlock_bh(&ifp->lock);
1845                 if (dad_failed)
1846                         ipv6_ifa_notify(0, ifp);
1847                 in6_ifa_put(ifp);
1848         } else if (ifp->flags&IFA_F_TEMPORARY) {
1849                 struct inet6_ifaddr *ifpub;
1850                 spin_lock_bh(&ifp->lock);
1851                 ifpub = ifp->ifpub;
1852                 if (ifpub) {
1853                         in6_ifa_hold(ifpub);
1854                         spin_unlock_bh(&ifp->lock);
1855                         ipv6_create_tempaddr(ifpub, ifp);
1856                         in6_ifa_put(ifpub);
1857                 } else {
1858                         spin_unlock_bh(&ifp->lock);
1859                 }
1860                 ipv6_del_addr(ifp);
1861         } else {
1862                 ipv6_del_addr(ifp);
1863         }
1864 }
1865 
1866 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1867 {
1868         int err = -ENOENT;
1869 
1870         spin_lock_bh(&ifp->lock);
1871         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1872                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1873                 err = 0;
1874         }
1875         spin_unlock_bh(&ifp->lock);
1876 
1877         return err;
1878 }
1879 
1880 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1881 {
1882         struct inet6_dev *idev = ifp->idev;
1883         struct net *net = dev_net(ifp->idev->dev);
1884 
1885         if (addrconf_dad_end(ifp)) {
1886                 in6_ifa_put(ifp);
1887                 return;
1888         }
1889 
1890         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1891                              ifp->idev->dev->name, &ifp->addr);
1892 
1893         spin_lock_bh(&ifp->lock);
1894 
1895         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1896                 int scope = ifp->scope;
1897                 u32 flags = ifp->flags;
1898                 struct in6_addr new_addr;
1899                 struct inet6_ifaddr *ifp2;
1900                 u32 valid_lft, preferred_lft;
1901                 int pfxlen = ifp->prefix_len;
1902                 int retries = ifp->stable_privacy_retry + 1;
1903 
1904                 if (retries > net->ipv6.sysctl.idgen_retries) {
1905                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1906                                              ifp->idev->dev->name);
1907                         goto errdad;
1908                 }
1909 
1910                 new_addr = ifp->addr;
1911                 if (ipv6_generate_stable_address(&new_addr, retries,
1912                                                  idev))
1913                         goto errdad;
1914 
1915                 valid_lft = ifp->valid_lft;
1916                 preferred_lft = ifp->prefered_lft;
1917 
1918                 spin_unlock_bh(&ifp->lock);
1919 
1920                 if (idev->cnf.max_addresses &&
1921                     ipv6_count_addresses(idev) >=
1922                     idev->cnf.max_addresses)
1923                         goto lock_errdad;
1924 
1925                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1926                                      ifp->idev->dev->name);
1927 
1928                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1929                                      scope, flags, valid_lft,
1930                                      preferred_lft);
1931                 if (IS_ERR(ifp2))
1932                         goto lock_errdad;
1933 
1934                 spin_lock_bh(&ifp2->lock);
1935                 ifp2->stable_privacy_retry = retries;
1936                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1937                 spin_unlock_bh(&ifp2->lock);
1938 
1939                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1940                 in6_ifa_put(ifp2);
1941 lock_errdad:
1942                 spin_lock_bh(&ifp->lock);
1943         }
1944 
1945 errdad:
1946         /* transition from _POSTDAD to _ERRDAD */
1947         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1948         spin_unlock_bh(&ifp->lock);
1949 
1950         addrconf_mod_dad_work(ifp, 0);
1951         in6_ifa_put(ifp);
1952 }
1953 
1954 /* Join to solicited addr multicast group.
1955  * caller must hold RTNL */
1956 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1957 {
1958         struct in6_addr maddr;
1959 
1960         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1961                 return;
1962 
1963         addrconf_addr_solict_mult(addr, &maddr);
1964         ipv6_dev_mc_inc(dev, &maddr);
1965 }
1966 
1967 /* caller must hold RTNL */
1968 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1969 {
1970         struct in6_addr maddr;
1971 
1972         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1973                 return;
1974 
1975         addrconf_addr_solict_mult(addr, &maddr);
1976         __ipv6_dev_mc_dec(idev, &maddr);
1977 }
1978 
1979 /* caller must hold RTNL */
1980 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1981 {
1982         struct in6_addr addr;
1983 
1984         if (ifp->prefix_len >= 127) /* RFC 6164 */
1985                 return;
1986         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1987         if (ipv6_addr_any(&addr))
1988                 return;
1989         __ipv6_dev_ac_inc(ifp->idev, &addr);
1990 }
1991 
1992 /* caller must hold RTNL */
1993 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1994 {
1995         struct in6_addr addr;
1996 
1997         if (ifp->prefix_len >= 127) /* RFC 6164 */
1998                 return;
1999         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2000         if (ipv6_addr_any(&addr))
2001                 return;
2002         __ipv6_dev_ac_dec(ifp->idev, &addr);
2003 }
2004 
2005 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2006 {
2007         if (dev->addr_len != EUI64_ADDR_LEN)
2008                 return -1;
2009         memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2010         eui[0] ^= 2;
2011         return 0;
2012 }
2013 
2014 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2015 {
2016         union fwnet_hwaddr *ha;
2017 
2018         if (dev->addr_len != FWNET_ALEN)
2019                 return -1;
2020 
2021         ha = (union fwnet_hwaddr *)dev->dev_addr;
2022 
2023         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2024         eui[0] ^= 2;
2025         return 0;
2026 }
2027 
2028 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2029 {
2030         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2031         if (dev->addr_len != ARCNET_ALEN)
2032                 return -1;
2033         memset(eui, 0, 7);
2034         eui[7] = *(u8 *)dev->dev_addr;
2035         return 0;
2036 }
2037 
2038 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2039 {
2040         if (dev->addr_len != INFINIBAND_ALEN)
2041                 return -1;
2042         memcpy(eui, dev->dev_addr + 12, 8);
2043         eui[0] |= 2;
2044         return 0;
2045 }
2046 
2047 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2048 {
2049         if (addr == 0)
2050                 return -1;
2051         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2052                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2053                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2054                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2055                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2056                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2057         eui[1] = 0;
2058         eui[2] = 0x5E;
2059         eui[3] = 0xFE;
2060         memcpy(eui + 4, &addr, 4);
2061         return 0;
2062 }
2063 
2064 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2065 {
2066         if (dev->priv_flags & IFF_ISATAP)
2067                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2068         return -1;
2069 }
2070 
2071 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2072 {
2073         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2074 }
2075 
2076 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2077 {
2078         memcpy(eui, dev->perm_addr, 3);
2079         memcpy(eui + 5, dev->perm_addr + 3, 3);
2080         eui[3] = 0xFF;
2081         eui[4] = 0xFE;
2082         eui[0] ^= 2;
2083         return 0;
2084 }
2085 
2086 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2087 {
2088         switch (dev->type) {
2089         case ARPHRD_ETHER:
2090         case ARPHRD_FDDI:
2091                 return addrconf_ifid_eui48(eui, dev);
2092         case ARPHRD_ARCNET:
2093                 return addrconf_ifid_arcnet(eui, dev);
2094         case ARPHRD_INFINIBAND:
2095                 return addrconf_ifid_infiniband(eui, dev);
2096         case ARPHRD_SIT:
2097                 return addrconf_ifid_sit(eui, dev);
2098         case ARPHRD_IPGRE:
2099                 return addrconf_ifid_gre(eui, dev);
2100         case ARPHRD_6LOWPAN:
2101                 return addrconf_ifid_eui64(eui, dev);
2102         case ARPHRD_IEEE1394:
2103                 return addrconf_ifid_ieee1394(eui, dev);
2104         case ARPHRD_TUNNEL6:
2105                 return addrconf_ifid_ip6tnl(eui, dev);
2106         }
2107         return -1;
2108 }
2109 
2110 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2111 {
2112         int err = -1;
2113         struct inet6_ifaddr *ifp;
2114 
2115         read_lock_bh(&idev->lock);
2116         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2117                 if (ifp->scope > IFA_LINK)
2118                         break;
2119                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2120                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2121                         err = 0;
2122                         break;
2123                 }
2124         }
2125         read_unlock_bh(&idev->lock);
2126         return err;
2127 }
2128 
2129 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2130 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2131 {
2132 regen:
2133         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2134         idev->rndid[0] &= ~0x02;
2135 
2136         /*
2137          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2138          * check if generated address is not inappropriate
2139          *
2140          *  - Reserved subnet anycast (RFC 2526)
2141          *      11111101 11....11 1xxxxxxx
2142          *  - ISATAP (RFC4214) 6.1
2143          *      00-00-5E-FE-xx-xx-xx-xx
2144          *  - value 0
2145          *  - XXX: already assigned to an address on the device
2146          */
2147         if (idev->rndid[0] == 0xfd &&
2148             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2149             (idev->rndid[7]&0x80))
2150                 goto regen;
2151         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2152                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2153                         goto regen;
2154                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2155                         goto regen;
2156         }
2157 }
2158 
2159 static void ipv6_regen_rndid(unsigned long data)
2160 {
2161         struct inet6_dev *idev = (struct inet6_dev *) data;
2162         unsigned long expires;
2163 
2164         rcu_read_lock_bh();
2165         write_lock_bh(&idev->lock);
2166 
2167         if (idev->dead)
2168                 goto out;
2169 
2170         __ipv6_regen_rndid(idev);
2171 
2172         expires = jiffies +
2173                 idev->cnf.temp_prefered_lft * HZ -
2174                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2175                 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2176                 idev->cnf.max_desync_factor * HZ;
2177         if (time_before(expires, jiffies)) {
2178                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2179                         __func__, idev->dev->name);
2180                 goto out;
2181         }
2182 
2183         if (!mod_timer(&idev->regen_timer, expires))
2184                 in6_dev_hold(idev);
2185 
2186 out:
2187         write_unlock_bh(&idev->lock);
2188         rcu_read_unlock_bh();
2189         in6_dev_put(idev);
2190 }
2191 
2192 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2193 {
2194         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2195                 __ipv6_regen_rndid(idev);
2196 }
2197 
2198 /*
2199  *      Add prefix route.
2200  */
2201 
2202 static void
2203 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2204                       unsigned long expires, u32 flags)
2205 {
2206         struct fib6_config cfg = {
2207                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2208                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2209                 .fc_ifindex = dev->ifindex,
2210                 .fc_expires = expires,
2211                 .fc_dst_len = plen,
2212                 .fc_flags = RTF_UP | flags,
2213                 .fc_nlinfo.nl_net = dev_net(dev),
2214                 .fc_protocol = RTPROT_KERNEL,
2215         };
2216 
2217         cfg.fc_dst = *pfx;
2218 
2219         /* Prevent useless cloning on PtP SIT.
2220            This thing is done here expecting that the whole
2221            class of non-broadcast devices need not cloning.
2222          */
2223 #if IS_ENABLED(CONFIG_IPV6_SIT)
2224         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2225                 cfg.fc_flags |= RTF_NONEXTHOP;
2226 #endif
2227 
2228         ip6_route_add(&cfg);
2229 }
2230 
2231 
2232 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2233                                                   int plen,
2234                                                   const struct net_device *dev,
2235                                                   u32 flags, u32 noflags)
2236 {
2237         struct fib6_node *fn;
2238         struct rt6_info *rt = NULL;
2239         struct fib6_table *table;
2240         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2241 
2242         table = fib6_get_table(dev_net(dev), tb_id);
2243         if (!table)
2244                 return NULL;
2245 
2246         read_lock_bh(&table->tb6_lock);
2247         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2248         if (!fn)
2249                 goto out;
2250 
2251         noflags |= RTF_CACHE;
2252         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2253                 if (rt->dst.dev->ifindex != dev->ifindex)
2254                         continue;
2255                 if ((rt->rt6i_flags & flags) != flags)
2256                         continue;
2257                 if ((rt->rt6i_flags & noflags) != 0)
2258                         continue;
2259                 dst_hold(&rt->dst);
2260                 break;
2261         }
2262 out:
2263         read_unlock_bh(&table->tb6_lock);
2264         return rt;
2265 }
2266 
2267 
2268 /* Create "default" multicast route to the interface */
2269 
2270 static void addrconf_add_mroute(struct net_device *dev)
2271 {
2272         struct fib6_config cfg = {
2273                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2274                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2275                 .fc_ifindex = dev->ifindex,
2276                 .fc_dst_len = 8,
2277                 .fc_flags = RTF_UP,
2278                 .fc_nlinfo.nl_net = dev_net(dev),
2279         };
2280 
2281         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2282 
2283         ip6_route_add(&cfg);
2284 }
2285 
2286 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2287 {
2288         struct inet6_dev *idev;
2289 
2290         ASSERT_RTNL();
2291 
2292         idev = ipv6_find_idev(dev);
2293         if (!idev)
2294                 return ERR_PTR(-ENOBUFS);
2295 
2296         if (idev->cnf.disable_ipv6)
2297                 return ERR_PTR(-EACCES);
2298 
2299         /* Add default multicast route */
2300         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2301                 addrconf_add_mroute(dev);
2302 
2303         return idev;
2304 }
2305 
2306 static void manage_tempaddrs(struct inet6_dev *idev,
2307                              struct inet6_ifaddr *ifp,
2308                              __u32 valid_lft, __u32 prefered_lft,
2309                              bool create, unsigned long now)
2310 {
2311         u32 flags;
2312         struct inet6_ifaddr *ift;
2313 
2314         read_lock_bh(&idev->lock);
2315         /* update all temporary addresses in the list */
2316         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2317                 int age, max_valid, max_prefered;
2318 
2319                 if (ifp != ift->ifpub)
2320                         continue;
2321 
2322                 /* RFC 4941 section 3.3:
2323                  * If a received option will extend the lifetime of a public
2324                  * address, the lifetimes of temporary addresses should
2325                  * be extended, subject to the overall constraint that no
2326                  * temporary addresses should ever remain "valid" or "preferred"
2327                  * for a time longer than (TEMP_VALID_LIFETIME) or
2328                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2329                  */
2330                 age = (now - ift->cstamp) / HZ;
2331                 max_valid = idev->cnf.temp_valid_lft - age;
2332                 if (max_valid < 0)
2333                         max_valid = 0;
2334 
2335                 max_prefered = idev->cnf.temp_prefered_lft -
2336                                idev->cnf.max_desync_factor - age;
2337                 if (max_prefered < 0)
2338                         max_prefered = 0;
2339 
2340                 if (valid_lft > max_valid)
2341                         valid_lft = max_valid;
2342 
2343                 if (prefered_lft > max_prefered)
2344                         prefered_lft = max_prefered;
2345 
2346                 spin_lock(&ift->lock);
2347                 flags = ift->flags;
2348                 ift->valid_lft = valid_lft;
2349                 ift->prefered_lft = prefered_lft;
2350                 ift->tstamp = now;
2351                 if (prefered_lft > 0)
2352                         ift->flags &= ~IFA_F_DEPRECATED;
2353 
2354                 spin_unlock(&ift->lock);
2355                 if (!(flags&IFA_F_TENTATIVE))
2356                         ipv6_ifa_notify(0, ift);
2357         }
2358 
2359         if ((create || list_empty(&idev->tempaddr_list)) &&
2360             idev->cnf.use_tempaddr > 0) {
2361                 /* When a new public address is created as described
2362                  * in [ADDRCONF], also create a new temporary address.
2363                  * Also create a temporary address if it's enabled but
2364                  * no temporary address currently exists.
2365                  */
2366                 read_unlock_bh(&idev->lock);
2367                 ipv6_create_tempaddr(ifp, NULL);
2368         } else {
2369                 read_unlock_bh(&idev->lock);
2370         }
2371 }
2372 
2373 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2374 {
2375         return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2376                idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2377 }
2378 
2379 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2380                                  const struct prefix_info *pinfo,
2381                                  struct inet6_dev *in6_dev,
2382                                  const struct in6_addr *addr, int addr_type,
2383                                  u32 addr_flags, bool sllao, bool tokenized,
2384                                  __u32 valid_lft, u32 prefered_lft)
2385 {
2386         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2387         int create = 0, update_lft = 0;
2388 
2389         if (!ifp && valid_lft) {
2390                 int max_addresses = in6_dev->cnf.max_addresses;
2391 
2392 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2393                 if (in6_dev->cnf.optimistic_dad &&
2394                     !net->ipv6.devconf_all->forwarding && sllao)
2395                         addr_flags |= IFA_F_OPTIMISTIC;
2396 #endif
2397 
2398                 /* Do not allow to create too much of autoconfigured
2399                  * addresses; this would be too easy way to crash kernel.
2400                  */
2401                 if (!max_addresses ||
2402                     ipv6_count_addresses(in6_dev) < max_addresses)
2403                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2404                                             pinfo->prefix_len,
2405                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2406                                             addr_flags, valid_lft,
2407                                             prefered_lft);
2408 
2409                 if (IS_ERR_OR_NULL(ifp))
2410                         return -1;
2411 
2412                 update_lft = 0;
2413                 create = 1;
2414                 spin_lock_bh(&ifp->lock);
2415                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2416                 ifp->cstamp = jiffies;
2417                 ifp->tokenized = tokenized;
2418                 spin_unlock_bh(&ifp->lock);
2419                 addrconf_dad_start(ifp);
2420         }
2421 
2422         if (ifp) {
2423                 u32 flags;
2424                 unsigned long now;
2425                 u32 stored_lft;
2426 
2427                 /* update lifetime (RFC2462 5.5.3 e) */
2428                 spin_lock_bh(&ifp->lock);
2429                 now = jiffies;
2430                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2431                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2432                 else
2433                         stored_lft = 0;
2434                 if (!update_lft && !create && stored_lft) {
2435                         const u32 minimum_lft = min_t(u32,
2436                                 stored_lft, MIN_VALID_LIFETIME);
2437                         valid_lft = max(valid_lft, minimum_lft);
2438 
2439                         /* RFC4862 Section 5.5.3e:
2440                          * "Note that the preferred lifetime of the
2441                          *  corresponding address is always reset to
2442                          *  the Preferred Lifetime in the received
2443                          *  Prefix Information option, regardless of
2444                          *  whether the valid lifetime is also reset or
2445                          *  ignored."
2446                          *
2447                          * So we should always update prefered_lft here.
2448                          */
2449                         update_lft = 1;
2450                 }
2451 
2452                 if (update_lft) {
2453                         ifp->valid_lft = valid_lft;
2454                         ifp->prefered_lft = prefered_lft;
2455                         ifp->tstamp = now;
2456                         flags = ifp->flags;
2457                         ifp->flags &= ~IFA_F_DEPRECATED;
2458                         spin_unlock_bh(&ifp->lock);
2459 
2460                         if (!(flags&IFA_F_TENTATIVE))
2461                                 ipv6_ifa_notify(0, ifp);
2462                 } else
2463                         spin_unlock_bh(&ifp->lock);
2464 
2465                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2466                                  create, now);
2467 
2468                 in6_ifa_put(ifp);
2469                 addrconf_verify();
2470         }
2471 
2472         return 0;
2473 }
2474 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2475 
2476 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2477 {
2478         struct prefix_info *pinfo;
2479         __u32 valid_lft;
2480         __u32 prefered_lft;
2481         int addr_type, err;
2482         u32 addr_flags = 0;
2483         struct inet6_dev *in6_dev;
2484         struct net *net = dev_net(dev);
2485 
2486         pinfo = (struct prefix_info *) opt;
2487 
2488         if (len < sizeof(struct prefix_info)) {
2489                 ADBG("addrconf: prefix option too short\n");
2490                 return;
2491         }
2492 
2493         /*
2494          *      Validation checks ([ADDRCONF], page 19)
2495          */
2496 
2497         addr_type = ipv6_addr_type(&pinfo->prefix);
2498 
2499         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2500                 return;
2501 
2502         valid_lft = ntohl(pinfo->valid);
2503         prefered_lft = ntohl(pinfo->prefered);
2504 
2505         if (prefered_lft > valid_lft) {
2506                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2507                 return;
2508         }
2509 
2510         in6_dev = in6_dev_get(dev);
2511 
2512         if (!in6_dev) {
2513                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2514                                     dev->name);
2515                 return;
2516         }
2517 
2518         /*
2519          *      Two things going on here:
2520          *      1) Add routes for on-link prefixes
2521          *      2) Configure prefixes with the auto flag set
2522          */
2523 
2524         if (pinfo->onlink) {
2525                 struct rt6_info *rt;
2526                 unsigned long rt_expires;
2527 
2528                 /* Avoid arithmetic overflow. Really, we could
2529                  * save rt_expires in seconds, likely valid_lft,
2530                  * but it would require division in fib gc, that it
2531                  * not good.
2532                  */
2533                 if (HZ > USER_HZ)
2534                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2535                 else
2536                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2537 
2538                 if (addrconf_finite_timeout(rt_expires))
2539                         rt_expires *= HZ;
2540 
2541                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2542                                                pinfo->prefix_len,
2543                                                dev,
2544                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2545                                                RTF_GATEWAY | RTF_DEFAULT);
2546 
2547                 if (rt) {
2548                         /* Autoconf prefix route */
2549                         if (valid_lft == 0) {
2550                                 ip6_del_rt(rt);
2551                                 rt = NULL;
2552                         } else if (addrconf_finite_timeout(rt_expires)) {
2553                                 /* not infinity */
2554                                 rt6_set_expires(rt, jiffies + rt_expires);
2555                         } else {
2556                                 rt6_clean_expires(rt);
2557                         }
2558                 } else if (valid_lft) {
2559                         clock_t expires = 0;
2560                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2561                         if (addrconf_finite_timeout(rt_expires)) {
2562                                 /* not infinity */
2563                                 flags |= RTF_EXPIRES;
2564                                 expires = jiffies_to_clock_t(rt_expires);
2565                         }
2566                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2567                                               dev, expires, flags);
2568                 }
2569                 ip6_rt_put(rt);
2570         }
2571 
2572         /* Try to figure out our local address for this prefix */
2573 
2574         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2575                 struct in6_addr addr;
2576                 bool tokenized = false, dev_addr_generated = false;
2577 
2578                 if (pinfo->prefix_len == 64) {
2579                         memcpy(&addr, &pinfo->prefix, 8);
2580 
2581                         if (!ipv6_addr_any(&in6_dev->token)) {
2582                                 read_lock_bh(&in6_dev->lock);
2583                                 memcpy(addr.s6_addr + 8,
2584                                        in6_dev->token.s6_addr + 8, 8);
2585                                 read_unlock_bh(&in6_dev->lock);
2586                                 tokenized = true;
2587                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2588                                    !ipv6_generate_stable_address(&addr, 0,
2589                                                                  in6_dev)) {
2590                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2591                                 goto ok;
2592                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2593                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2594                                 goto put;
2595                         } else {
2596                                 dev_addr_generated = true;
2597                         }
2598                         goto ok;
2599                 }
2600                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2601                                     pinfo->prefix_len);
2602                 goto put;
2603 
2604 ok:
2605                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2606                                                    &addr, addr_type,
2607                                                    addr_flags, sllao,
2608                                                    tokenized, valid_lft,
2609                                                    prefered_lft);
2610                 if (err)
2611                         goto put;
2612 
2613                 /* Ignore error case here because previous prefix add addr was
2614                  * successful which will be notified.
2615                  */
2616                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2617                                               addr_type, addr_flags, sllao,
2618                                               tokenized, valid_lft,
2619                                               prefered_lft,
2620                                               dev_addr_generated);
2621         }
2622         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2623 put:
2624         in6_dev_put(in6_dev);
2625 }
2626 
2627 /*
2628  *      Set destination address.
2629  *      Special case for SIT interfaces where we create a new "virtual"
2630  *      device.
2631  */
2632 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2633 {
2634         struct in6_ifreq ireq;
2635         struct net_device *dev;
2636         int err = -EINVAL;
2637 
2638         rtnl_lock();
2639 
2640         err = -EFAULT;
2641         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2642                 goto err_exit;
2643 
2644         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2645 
2646         err = -ENODEV;
2647         if (!dev)
2648                 goto err_exit;
2649 
2650 #if IS_ENABLED(CONFIG_IPV6_SIT)
2651         if (dev->type == ARPHRD_SIT) {
2652                 const struct net_device_ops *ops = dev->netdev_ops;
2653                 struct ifreq ifr;
2654                 struct ip_tunnel_parm p;
2655 
2656                 err = -EADDRNOTAVAIL;
2657                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2658                         goto err_exit;
2659 
2660                 memset(&p, 0, sizeof(p));
2661                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2662                 p.iph.saddr = 0;
2663                 p.iph.version = 4;
2664                 p.iph.ihl = 5;
2665                 p.iph.protocol = IPPROTO_IPV6;
2666                 p.iph.ttl = 64;
2667                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2668 
2669                 if (ops->ndo_do_ioctl) {
2670                         mm_segment_t oldfs = get_fs();
2671 
2672                         set_fs(KERNEL_DS);
2673                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2674                         set_fs(oldfs);
2675                 } else
2676                         err = -EOPNOTSUPP;
2677 
2678                 if (err == 0) {
2679                         err = -ENOBUFS;
2680                         dev = __dev_get_by_name(net, p.name);
2681                         if (!dev)
2682                                 goto err_exit;
2683                         err = dev_open(dev);
2684                 }
2685         }
2686 #endif
2687 
2688 err_exit:
2689         rtnl_unlock();
2690         return err;
2691 }
2692 
2693 static int ipv6_mc_config(struct sock *sk, bool join,
2694                           const struct in6_addr *addr, int ifindex)
2695 {
2696         int ret;
2697 
2698         ASSERT_RTNL();
2699 
2700         lock_sock(sk);
2701         if (join)
2702                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2703         else
2704                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2705         release_sock(sk);
2706 
2707         return ret;
2708 }
2709 
2710 /*
2711  *      Manual configuration of address on an interface
2712  */
2713 static int inet6_addr_add(struct net *net, int ifindex,
2714                           const struct in6_addr *pfx,
2715                           const struct in6_addr *peer_pfx,
2716                           unsigned int plen, __u32 ifa_flags,
2717                           __u32 prefered_lft, __u32 valid_lft)
2718 {
2719         struct inet6_ifaddr *ifp;
2720         struct inet6_dev *idev;
2721         struct net_device *dev;
2722         unsigned long timeout;
2723         clock_t expires;
2724         int scope;
2725         u32 flags;
2726 
2727         ASSERT_RTNL();
2728 
2729         if (plen > 128)
2730                 return -EINVAL;
2731 
2732         /* check the lifetime */
2733         if (!valid_lft || prefered_lft > valid_lft)
2734                 return -EINVAL;
2735 
2736         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2737                 return -EINVAL;
2738 
2739         dev = __dev_get_by_index(net, ifindex);
2740         if (!dev)
2741                 return -ENODEV;
2742 
2743         idev = addrconf_add_dev(dev);
2744         if (IS_ERR(idev))
2745                 return PTR_ERR(idev);
2746 
2747         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2748                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2749                                          true, pfx, ifindex);
2750 
2751                 if (ret < 0)
2752                         return ret;
2753         }
2754 
2755         scope = ipv6_addr_scope(pfx);
2756 
2757         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2758         if (addrconf_finite_timeout(timeout)) {
2759                 expires = jiffies_to_clock_t(timeout * HZ);
2760                 valid_lft = timeout;
2761                 flags = RTF_EXPIRES;
2762         } else {
2763                 expires = 0;
2764                 flags = 0;
2765                 ifa_flags |= IFA_F_PERMANENT;
2766         }
2767 
2768         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2769         if (addrconf_finite_timeout(timeout)) {
2770                 if (timeout == 0)
2771                         ifa_flags |= IFA_F_DEPRECATED;
2772                 prefered_lft = timeout;
2773         }
2774 
2775         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2776                             valid_lft, prefered_lft);
2777 
2778         if (!IS_ERR(ifp)) {
2779                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2780                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2781                                               expires, flags);
2782                 }
2783 
2784                 /*
2785                  * Note that section 3.1 of RFC 4429 indicates
2786                  * that the Optimistic flag should not be set for
2787                  * manually configured addresses
2788                  */
2789                 addrconf_dad_start(ifp);
2790                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2791                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2792                                          true, jiffies);
2793                 in6_ifa_put(ifp);
2794                 addrconf_verify_rtnl();
2795                 return 0;
2796         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2797                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2798                                false, pfx, ifindex);
2799         }
2800 
2801         return PTR_ERR(ifp);
2802 }
2803 
2804 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2805                           const struct in6_addr *pfx, unsigned int plen)
2806 {
2807         struct inet6_ifaddr *ifp;
2808         struct inet6_dev *idev;
2809         struct net_device *dev;
2810 
2811         if (plen > 128)
2812                 return -EINVAL;
2813 
2814         dev = __dev_get_by_index(net, ifindex);
2815         if (!dev)
2816                 return -ENODEV;
2817 
2818         idev = __in6_dev_get(dev);
2819         if (!idev)
2820                 return -ENXIO;
2821 
2822         read_lock_bh(&idev->lock);
2823         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2824                 if (ifp->prefix_len == plen &&
2825                     ipv6_addr_equal(pfx, &ifp->addr)) {
2826                         in6_ifa_hold(ifp);
2827                         read_unlock_bh(&idev->lock);
2828 
2829                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2830                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2831                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2832                                                  jiffies);
2833                         ipv6_del_addr(ifp);
2834                         addrconf_verify_rtnl();
2835                         if (ipv6_addr_is_multicast(pfx)) {
2836                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2837                                                false, pfx, dev->ifindex);
2838                         }
2839                         return 0;
2840                 }
2841         }
2842         read_unlock_bh(&idev->lock);
2843         return -EADDRNOTAVAIL;
2844 }
2845 
2846 
2847 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2848 {
2849         struct in6_ifreq ireq;
2850         int err;
2851 
2852         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2853                 return -EPERM;
2854 
2855         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2856                 return -EFAULT;
2857 
2858         rtnl_lock();
2859         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2860                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2861                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2862         rtnl_unlock();
2863         return err;
2864 }
2865 
2866 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2867 {
2868         struct in6_ifreq ireq;
2869         int err;
2870 
2871         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2872                 return -EPERM;
2873 
2874         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2875                 return -EFAULT;
2876 
2877         rtnl_lock();
2878         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2879                              ireq.ifr6_prefixlen);
2880         rtnl_unlock();
2881         return err;
2882 }
2883 
2884 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2885                      int plen, int scope)
2886 {
2887         struct inet6_ifaddr *ifp;
2888 
2889         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2890                             scope, IFA_F_PERMANENT,
2891                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2892         if (!IS_ERR(ifp)) {
2893                 spin_lock_bh(&ifp->lock);
2894                 ifp->flags &= ~IFA_F_TENTATIVE;
2895                 spin_unlock_bh(&ifp->lock);
2896                 rt_genid_bump_ipv6(dev_net(idev->dev));
2897                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2898                 in6_ifa_put(ifp);
2899         }
2900 }
2901 
2902 #if IS_ENABLED(CONFIG_IPV6_SIT)
2903 static void sit_add_v4_addrs(struct inet6_dev *idev)
2904 {
2905         struct in6_addr addr;
2906         struct net_device *dev;
2907         struct net *net = dev_net(idev->dev);
2908         int scope, plen;
2909         u32 pflags = 0;
2910 
2911         ASSERT_RTNL();
2912 
2913         memset(&addr, 0, sizeof(struct in6_addr));
2914         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2915 
2916         if (idev->dev->flags&IFF_POINTOPOINT) {
2917                 addr.s6_addr32[0] = htonl(0xfe800000);
2918                 scope = IFA_LINK;
2919                 plen = 64;
2920         } else {
2921                 scope = IPV6_ADDR_COMPATv4;
2922                 plen = 96;
2923                 pflags |= RTF_NONEXTHOP;
2924         }
2925 
2926         if (addr.s6_addr32[3]) {
2927                 add_addr(idev, &addr, plen, scope);
2928                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2929                 return;
2930         }
2931 
2932         for_each_netdev(net, dev) {
2933                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2934                 if (in_dev && (dev->flags & IFF_UP)) {
2935                         struct in_ifaddr *ifa;
2936 
2937                         int flag = scope;
2938 
2939                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2940 
2941                                 addr.s6_addr32[3] = ifa->ifa_local;
2942 
2943                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2944                                         continue;
2945                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2946                                         if (idev->dev->flags&IFF_POINTOPOINT)
2947                                                 continue;
2948                                         flag |= IFA_HOST;
2949                                 }
2950 
2951                                 add_addr(idev, &addr, plen, flag);
2952                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2953                                                       pflags);
2954                         }
2955                 }
2956         }
2957 }
2958 #endif
2959 
2960 static void init_loopback(struct net_device *dev)
2961 {
2962         struct inet6_dev  *idev;
2963         struct net_device *sp_dev;
2964         struct inet6_ifaddr *sp_ifa;
2965         struct rt6_info *sp_rt;
2966 
2967         /* ::1 */
2968 
2969         ASSERT_RTNL();
2970 
2971         idev = ipv6_find_idev(dev);
2972         if (!idev) {
2973                 pr_debug("%s: add_dev failed\n", __func__);
2974                 return;
2975         }
2976 
2977         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2978 
2979         /* Add routes to other interface's IPv6 addresses */
2980         for_each_netdev(dev_net(dev), sp_dev) {
2981                 if (!strcmp(sp_dev->name, dev->name))
2982                         continue;
2983 
2984                 idev = __in6_dev_get(sp_dev);
2985                 if (!idev)
2986                         continue;
2987 
2988                 read_lock_bh(&idev->lock);
2989                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2990 
2991                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2992                                 continue;
2993 
2994                         if (sp_ifa->rt) {
2995                                 /* This dst has been added to garbage list when
2996                                  * lo device down, release this obsolete dst and
2997                                  * reallocate a new router for ifa.
2998                                  */
2999                                 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
3000                                         ip6_rt_put(sp_ifa->rt);
3001                                         sp_ifa->rt = NULL;
3002                                 } else {
3003                                         continue;
3004                                 }
3005                         }
3006 
3007                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3008 
3009                         /* Failure cases are ignored */
3010                         if (!IS_ERR(sp_rt)) {
3011                                 sp_ifa->rt = sp_rt;
3012                                 ip6_ins_rt(sp_rt);
3013                         }
3014                 }
3015                 read_unlock_bh(&idev->lock);
3016         }
3017 }
3018 
3019 void addrconf_add_linklocal(struct inet6_dev *idev,
3020                             const struct in6_addr *addr, u32 flags)
3021 {
3022         struct inet6_ifaddr *ifp;
3023         u32 addr_flags = flags | IFA_F_PERMANENT;
3024 
3025 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3026         if (idev->cnf.optimistic_dad &&
3027             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3028                 addr_flags |= IFA_F_OPTIMISTIC;
3029 #endif
3030 
3031         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3032                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3033         if (!IS_ERR(ifp)) {
3034                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3035                 addrconf_dad_start(ifp);
3036                 in6_ifa_put(ifp);
3037         }
3038 }
3039 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3040 
3041 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3042 {
3043         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3044                 return true;
3045 
3046         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3047             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3048                 return true;
3049 
3050         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3051             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3052                 return true;
3053 
3054         return false;
3055 }
3056 
3057 static int ipv6_generate_stable_address(struct in6_addr *address,
3058                                         u8 dad_count,
3059                                         const struct inet6_dev *idev)
3060 {
3061         static DEFINE_SPINLOCK(lock);
3062         static __u32 digest[SHA_DIGEST_WORDS];
3063         static __u32 workspace[SHA_WORKSPACE_WORDS];
3064 
3065         static union {
3066                 char __data[SHA_MESSAGE_BYTES];
3067                 struct {
3068                         struct in6_addr secret;
3069                         __be32 prefix[2];
3070                         unsigned char hwaddr[MAX_ADDR_LEN];
3071                         u8 dad_count;
3072                 } __packed;
3073         } data;
3074 
3075         struct in6_addr secret;
3076         struct in6_addr temp;
3077         struct net *net = dev_net(idev->dev);
3078 
3079         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3080 
3081         if (idev->cnf.stable_secret.initialized)
3082                 secret = idev->cnf.stable_secret.secret;
3083         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3084                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3085         else
3086                 return -1;
3087 
3088 retry:
3089         spin_lock_bh(&lock);
3090 
3091         sha_init(digest);
3092         memset(&data, 0, sizeof(data));
3093         memset(workspace, 0, sizeof(workspace));
3094         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3095         data.prefix[0] = address->s6_addr32[0];
3096         data.prefix[1] = address->s6_addr32[1];
3097         data.secret = secret;
3098         data.dad_count = dad_count;
3099 
3100         sha_transform(digest, data.__data, workspace);
3101 
3102         temp = *address;
3103         temp.s6_addr32[2] = (__force __be32)digest[0];
3104         temp.s6_addr32[3] = (__force __be32)digest[1];
3105 
3106         spin_unlock_bh(&lock);
3107 
3108         if (ipv6_reserved_interfaceid(temp)) {
3109                 dad_count++;
3110                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3111                         return -1;
3112                 goto retry;
3113         }
3114 
3115         *address = temp;
3116         return 0;
3117 }
3118 
3119 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3120 {
3121         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3122 
3123         if (s->initialized)
3124                 return;
3125         s = &idev->cnf.stable_secret;
3126         get_random_bytes(&s->secret, sizeof(s->secret));
3127         s->initialized = true;
3128 }
3129 
3130 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3131 {
3132         struct in6_addr addr;
3133 
3134         /* no link local addresses on L3 master devices */
3135         if (netif_is_l3_master(idev->dev))
3136                 return;
3137 
3138         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3139 
3140         switch (idev->addr_gen_mode) {
3141         case IN6_ADDR_GEN_MODE_RANDOM:
3142                 ipv6_gen_mode_random_init(idev);
3143                 /* fallthrough */
3144         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3145                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3146                         addrconf_add_linklocal(idev, &addr,
3147                                                IFA_F_STABLE_PRIVACY);
3148                 else if (prefix_route)
3149                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3150                 break;
3151         case IN6_ADDR_GEN_MODE_EUI64:
3152                 /* addrconf_add_linklocal also adds a prefix_route and we
3153                  * only need to care about prefix routes if ipv6_generate_eui64
3154                  * couldn't generate one.
3155                  */
3156                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3157                         addrconf_add_linklocal(idev, &addr, 0);
3158                 else if (prefix_route)
3159                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3160                 break;
3161         case IN6_ADDR_GEN_MODE_NONE:
3162         default:
3163                 /* will not add any link local address */
3164                 break;
3165         }
3166 }
3167 
3168 static void addrconf_dev_config(struct net_device *dev)
3169 {
3170         struct inet6_dev *idev;
3171 
3172         ASSERT_RTNL();
3173 
3174         if ((dev->type != ARPHRD_ETHER) &&
3175             (dev->type != ARPHRD_FDDI) &&
3176             (dev->type != ARPHRD_ARCNET) &&
3177             (dev->type != ARPHRD_INFINIBAND) &&
3178             (dev->type != ARPHRD_IEEE1394) &&
3179             (dev->type != ARPHRD_TUNNEL6) &&
3180             (dev->type != ARPHRD_6LOWPAN) &&
3181             (dev->type != ARPHRD_NONE)) {
3182                 /* Alas, we support only Ethernet autoconfiguration. */
3183                 return;
3184         }
3185 
3186         idev = addrconf_add_dev(dev);
3187         if (IS_ERR(idev))
3188                 return;
3189 
3190         /* this device type has no EUI support */
3191         if (dev->type == ARPHRD_NONE &&
3192             idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3193                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3194 
3195         addrconf_addr_gen(idev, false);
3196 }
3197 
3198 #if IS_ENABLED(CONFIG_IPV6_SIT)
3199 static void addrconf_sit_config(struct net_device *dev)
3200 {
3201         struct inet6_dev *idev;
3202 
3203         ASSERT_RTNL();
3204 
3205         /*
3206          * Configure the tunnel with one of our IPv4
3207          * addresses... we should configure all of
3208          * our v4 addrs in the tunnel
3209          */
3210 
3211         idev = ipv6_find_idev(dev);
3212         if (!idev) {
3213                 pr_debug("%s: add_dev failed\n", __func__);
3214                 return;
3215         }
3216 
3217         if (dev->priv_flags & IFF_ISATAP) {
3218                 addrconf_addr_gen(idev, false);
3219                 return;
3220         }
3221 
3222         sit_add_v4_addrs(idev);
3223 
3224         if (dev->flags&IFF_POINTOPOINT)
3225                 addrconf_add_mroute(dev);
3226 }
3227 #endif
3228 
3229 #if IS_ENABLED(CONFIG_NET_IPGRE)
3230 static void addrconf_gre_config(struct net_device *dev)
3231 {
3232         struct inet6_dev *idev;
3233 
3234         ASSERT_RTNL();
3235 
3236         idev = ipv6_find_idev(dev);
3237         if (!idev) {
3238                 pr_debug("%s: add_dev failed\n", __func__);
3239                 return;
3240         }
3241 
3242         addrconf_addr_gen(idev, true);
3243         if (dev->flags & IFF_POINTOPOINT)
3244                 addrconf_add_mroute(dev);
3245 }
3246 #endif
3247 
3248 static int fixup_permanent_addr(struct inet6_dev *idev,
3249                                 struct inet6_ifaddr *ifp)
3250 {
3251         if (!ifp->rt) {
3252                 struct rt6_info *rt;
3253 
3254                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3255                 if (unlikely(IS_ERR(rt)))
3256                         return PTR_ERR(rt);
3257 
3258                 ifp->rt = rt;
3259         }
3260 
3261         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3262                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3263                                       idev->dev, 0, 0);
3264         }
3265 
3266         addrconf_dad_start(ifp);
3267 
3268         return 0;
3269 }
3270 
3271 static void addrconf_permanent_addr(struct net_device *dev)
3272 {
3273         struct inet6_ifaddr *ifp, *tmp;
3274         struct inet6_dev *idev;
3275 
3276         idev = __in6_dev_get(dev);
3277         if (!idev)
3278                 return;
3279 
3280         write_lock_bh(&idev->lock);
3281 
3282         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3283                 if ((ifp->flags & IFA_F_PERMANENT) &&
3284                     fixup_permanent_addr(idev, ifp) < 0) {
3285                         write_unlock_bh(&idev->lock);
3286                         ipv6_del_addr(ifp);
3287                         write_lock_bh(&idev->lock);
3288 
3289                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3290                                              idev->dev->name, &ifp->addr);
3291                 }
3292         }
3293 
3294         write_unlock_bh(&idev->lock);
3295 }
3296 
3297 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3298                            void *ptr)
3299 {
3300         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3301         struct netdev_notifier_changeupper_info *info;
3302         struct inet6_dev *idev = __in6_dev_get(dev);
3303         int run_pending = 0;
3304         int err;
3305 
3306         switch (event) {
3307         case NETDEV_REGISTER:
3308                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3309                         idev = ipv6_add_dev(dev);
3310                         if (IS_ERR(idev))
3311                                 return notifier_from_errno(PTR_ERR(idev));
3312                 }
3313                 break;
3314 
3315         case NETDEV_CHANGEMTU:
3316                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3317                 if (dev->mtu < IPV6_MIN_MTU) {
3318                         addrconf_ifdown(dev, 1);
3319                         break;
3320                 }
3321 
3322                 if (idev) {
3323                         rt6_mtu_change(dev, dev->mtu);
3324                         idev->cnf.mtu6 = dev->mtu;
3325                         break;
3326                 }
3327 
3328                 /* allocate new idev */
3329                 idev = ipv6_add_dev(dev);
3330                 if (IS_ERR(idev))
3331                         break;
3332 
3333                 /* device is still not ready */
3334                 if (!(idev->if_flags & IF_READY))
3335                         break;
3336 
3337                 run_pending = 1;
3338 
3339                 /* fall through */
3340 
3341         case NETDEV_UP:
3342         case NETDEV_CHANGE:
3343                 if (dev->flags & IFF_SLAVE)
3344                         break;
3345 
3346                 if (idev && idev->cnf.disable_ipv6)
3347                         break;
3348 
3349                 if (event == NETDEV_UP) {
3350                         /* restore routes for permanent addresses */
3351                         addrconf_permanent_addr(dev);
3352 
3353                         if (!addrconf_qdisc_ok(dev)) {
3354                                 /* device is not ready yet. */
3355                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3356                                         dev->name);
3357                                 break;
3358                         }
3359 
3360                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3361                                 idev = ipv6_add_dev(dev);
3362 
3363                         if (!IS_ERR_OR_NULL(idev)) {
3364                                 idev->if_flags |= IF_READY;
3365                                 run_pending = 1;
3366                         }
3367                 } else if (event == NETDEV_CHANGE) {
3368                         if (!addrconf_qdisc_ok(dev)) {
3369                                 /* device is still not ready. */
3370                                 break;
3371                         }
3372 
3373                         if (idev) {
3374                                 if (idev->if_flags & IF_READY)
3375                                         /* device is already configured. */
3376                                         break;
3377                                 idev->if_flags |= IF_READY;
3378                         }
3379 
3380                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3381                                 dev->name);
3382 
3383                         run_pending = 1;
3384                 }
3385 
3386                 switch (dev->type) {
3387 #if IS_ENABLED(CONFIG_IPV6_SIT)
3388                 case ARPHRD_SIT:
3389                         addrconf_sit_config(dev);
3390                         break;
3391 #endif
3392 #if IS_ENABLED(CONFIG_NET_IPGRE)
3393                 case ARPHRD_IPGRE:
3394                         addrconf_gre_config(dev);
3395                         break;
3396 #endif
3397                 case ARPHRD_LOOPBACK:
3398                         init_loopback(dev);
3399                         break;
3400 
3401                 default:
3402                         addrconf_dev_config(dev);
3403                         break;
3404                 }
3405 
3406                 if (!IS_ERR_OR_NULL(idev)) {
3407                         if (run_pending)
3408                                 addrconf_dad_run(idev);
3409 
3410                         /*
3411                          * If the MTU changed during the interface down,
3412                          * when the interface up, the changed MTU must be
3413                          * reflected in the idev as well as routers.
3414                          */
3415                         if (idev->cnf.mtu6 != dev->mtu &&
3416                             dev->mtu >= IPV6_MIN_MTU) {
3417                                 rt6_mtu_change(dev, dev->mtu);
3418                                 idev->cnf.mtu6 = dev->mtu;
3419                         }
3420                         idev->tstamp = jiffies;
3421                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3422 
3423                         /*
3424                          * If the changed mtu during down is lower than
3425                          * IPV6_MIN_MTU stop IPv6 on this interface.
3426                          */
3427                         if (dev->mtu < IPV6_MIN_MTU)
3428                                 addrconf_ifdown(dev, 1);
3429                 }
3430                 break;
3431 
3432         case NETDEV_DOWN:
3433         case NETDEV_UNREGISTER:
3434                 /*
3435                  *      Remove all addresses from this interface.
3436                  */
3437                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3438                 break;
3439 
3440         case NETDEV_CHANGENAME:
3441                 if (idev) {
3442                         snmp6_unregister_dev(idev);
3443                         addrconf_sysctl_unregister(idev);
3444                         err = addrconf_sysctl_register(idev);
3445                         if (err)
3446                                 return notifier_from_errno(err);
3447                         err = snmp6_register_dev(idev);
3448                         if (err) {
3449                                 addrconf_sysctl_unregister(idev);
3450                                 return notifier_from_errno(err);
3451                         }
3452                 }
3453                 break;
3454 
3455         case NETDEV_PRE_TYPE_CHANGE:
3456         case NETDEV_POST_TYPE_CHANGE:
3457                 if (idev)
3458                         addrconf_type_change(dev, event);
3459                 break;
3460 
3461         case NETDEV_CHANGEUPPER:
3462                 info = ptr;
3463 
3464                 /* flush all routes if dev is linked to or unlinked from
3465                  * an L3 master device (e.g., VRF)
3466                  */
3467                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3468                         addrconf_ifdown(dev, 0);
3469         }
3470 
3471         return NOTIFY_OK;
3472 }
3473 
3474 /*
3475  *      addrconf module should be notified of a device going up
3476  */
3477 static struct notifier_block ipv6_dev_notf = {
3478         .notifier_call = addrconf_notify,
3479 };
3480 
3481 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3482 {
3483         struct inet6_dev *idev;
3484         ASSERT_RTNL();
3485 
3486         idev = __in6_dev_get(dev);
3487 
3488         if (event == NETDEV_POST_TYPE_CHANGE)
3489                 ipv6_mc_remap(idev);
3490         else if (event == NETDEV_PRE_TYPE_CHANGE)
3491                 ipv6_mc_unmap(idev);
3492 }
3493 
3494 static bool addr_is_local(const struct in6_addr *addr)
3495 {
3496         return ipv6_addr_type(addr) &
3497                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3498 }
3499 
3500 static int addrconf_ifdown(struct net_device *dev, int how)
3501 {
3502         struct net *net = dev_net(dev);
3503         struct inet6_dev *idev;
3504         struct inet6_ifaddr *ifa, *tmp;
3505         struct list_head del_list;
3506         int _keep_addr;
3507         bool keep_addr;
3508         int state, i;
3509 
3510         ASSERT_RTNL();
3511 
3512         rt6_ifdown(net, dev);
3513         neigh_ifdown(&nd_tbl, dev);
3514 
3515         idev = __in6_dev_get(dev);
3516         if (!idev)
3517                 return -ENODEV;
3518 
3519         /*
3520          * Step 1: remove reference to ipv6 device from parent device.
3521          *         Do not dev_put!
3522          */
3523         if (how) {
3524                 idev->dead = 1;
3525 
3526                 /* protected by rtnl_lock */
3527                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3528 
3529                 /* Step 1.5: remove snmp6 entry */
3530                 snmp6_unregister_dev(idev);
3531 
3532         }
3533 
3534         /* aggregate the system setting and interface setting */
3535         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3536         if (!_keep_addr)
3537                 _keep_addr = idev->cnf.keep_addr_on_down;
3538 
3539         /* combine the user config with event to determine if permanent
3540          * addresses are to be removed from address hash table
3541          */
3542         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3543 
3544         /* Step 2: clear hash table */
3545         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3546                 struct hlist_head *h = &inet6_addr_lst[i];
3547 
3548                 spin_lock_bh(&addrconf_hash_lock);
3549 restart:
3550                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3551                         if (ifa->idev == idev) {
3552                                 addrconf_del_dad_work(ifa);
3553                                 /* combined flag + permanent flag decide if
3554                                  * address is retained on a down event
3555                                  */
3556                                 if (!keep_addr ||
3557                                     !(ifa->flags & IFA_F_PERMANENT) ||
3558                                     addr_is_local(&ifa->addr)) {
3559                                         hlist_del_init_rcu(&ifa->addr_lst);
3560                                         goto restart;
3561                                 }
3562                         }
3563                 }
3564                 spin_unlock_bh(&addrconf_hash_lock);
3565         }
3566 
3567         write_lock_bh(&idev->lock);
3568 
3569         addrconf_del_rs_timer(idev);
3570 
3571         /* Step 2: clear flags for stateless addrconf */
3572         if (!how)
3573                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3574 
3575         if (how && del_timer(&idev->regen_timer))
3576                 in6_dev_put(idev);
3577 
3578         /* Step 3: clear tempaddr list */
3579         while (!list_empty(&idev->tempaddr_list)) {
3580                 ifa = list_first_entry(&idev->tempaddr_list,
3581                                        struct inet6_ifaddr, tmp_list);
3582                 list_del(&ifa->tmp_list);
3583                 write_unlock_bh(&idev->lock);
3584                 spin_lock_bh(&ifa->lock);
3585 
3586                 if (ifa->ifpub) {
3587                         in6_ifa_put(ifa->ifpub);
3588                         ifa->ifpub = NULL;
3589                 }
3590                 spin_unlock_bh(&ifa->lock);
3591                 in6_ifa_put(ifa);
3592                 write_lock_bh(&idev->lock);
3593         }
3594 
3595         /* re-combine the user config with event to determine if permanent
3596          * addresses are to be removed from the interface list
3597          */
3598         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3599 
3600         INIT_LIST_HEAD(&del_list);
3601         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3602                 struct rt6_info *rt = NULL;
3603 
3604                 addrconf_del_dad_work(ifa);
3605 
3606                 write_unlock_bh(&idev->lock);
3607                 spin_lock_bh(&ifa->lock);
3608 
3609                 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3610                     !addr_is_local(&ifa->addr)) {
3611                         /* set state to skip the notifier below */
3612                         state = INET6_IFADDR_STATE_DEAD;
3613                         ifa->state = 0;
3614                         if (!(ifa->flags & IFA_F_NODAD))
3615                                 ifa->flags |= IFA_F_TENTATIVE;
3616 
3617                         rt = ifa->rt;
3618                         ifa->rt = NULL;
3619                 } else {
3620                         state = ifa->state;
3621                         ifa->state = INET6_IFADDR_STATE_DEAD;
3622 
3623                         list_move(&ifa->if_list, &del_list);
3624                 }
3625 
3626                 spin_unlock_bh(&ifa->lock);
3627 
3628                 if (rt)
3629                         ip6_del_rt(rt);
3630 
3631                 if (state != INET6_IFADDR_STATE_DEAD) {
3632                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3633                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3634                 } else {
3635                         if (idev->cnf.forwarding)
3636                                 addrconf_leave_anycast(ifa);
3637                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3638                 }
3639 
3640                 write_lock_bh(&idev->lock);
3641         }
3642 
3643         write_unlock_bh(&idev->lock);
3644 
3645         /* now clean up addresses to be removed */
3646         while (!list_empty(&del_list)) {
3647                 ifa = list_first_entry(&del_list,
3648                                        struct inet6_ifaddr, if_list);
3649                 list_del(&ifa->if_list);
3650 
3651                 in6_ifa_put(ifa);
3652         }
3653 
3654         /* Step 5: Discard anycast and multicast list */
3655         if (how) {
3656                 ipv6_ac_destroy_dev(idev);
3657                 ipv6_mc_destroy_dev(idev);
3658         } else {
3659                 ipv6_mc_down(idev);
3660         }
3661 
3662         idev->tstamp = jiffies;
3663 
3664         /* Last: Shot the device (if unregistered) */
3665         if (how) {
3666                 addrconf_sysctl_unregister(idev);
3667                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3668                 neigh_ifdown(&nd_tbl, dev);
3669                 in6_dev_put(idev);
3670         }
3671         return 0;
3672 }
3673 
3674 static void addrconf_rs_timer(unsigned long data)
3675 {
3676         struct inet6_dev *idev = (struct inet6_dev *)data;
3677         struct net_device *dev = idev->dev;
3678         struct in6_addr lladdr;
3679 
3680         write_lock(&idev->lock);
3681         if (idev->dead || !(idev->if_flags & IF_READY))
3682                 goto out;
3683 
3684         if (!ipv6_accept_ra(idev))
3685                 goto out;
3686 
3687         /* Announcement received after solicitation was sent */
3688         if (idev->if_flags & IF_RA_RCVD)
3689                 goto out;
3690 
3691         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3692                 write_unlock(&idev->lock);
3693                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3694                         ndisc_send_rs(dev, &lladdr,
3695                                       &in6addr_linklocal_allrouters);
3696                 else
3697                         goto put;
3698 
3699                 write_lock(&idev->lock);
3700                 /* The wait after the last probe can be shorter */
3701                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3702                                              idev->cnf.rtr_solicits) ?
3703                                       idev->cnf.rtr_solicit_delay :
3704                                       idev->cnf.rtr_solicit_interval);
3705         } else {
3706                 /*
3707                  * Note: we do not support deprecated "all on-link"
3708                  * assumption any longer.
3709                  */
3710                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3711         }
3712 
3713 out:
3714         write_unlock(&idev->lock);
3715 put:
3716         in6_dev_put(idev);
3717 }
3718 
3719 /*
3720  *      Duplicate Address Detection
3721  */
3722 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3723 {
3724         unsigned long rand_num;
3725         struct inet6_dev *idev = ifp->idev;
3726 
3727         if (ifp->flags & IFA_F_OPTIMISTIC)
3728                 rand_num = 0;
3729         else
3730                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3731 
3732         ifp->dad_probes = idev->cnf.dad_transmits;
3733         addrconf_mod_dad_work(ifp, rand_num);
3734 }
3735 
3736 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3737 {
3738         struct inet6_dev *idev = ifp->idev;
3739         struct net_device *dev = idev->dev;
3740         bool bump_id, notify = false;
3741 
3742         addrconf_join_solict(dev, &ifp->addr);
3743 
3744         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3745 
3746         read_lock_bh(&idev->lock);
3747         spin_lock(&ifp->lock);
3748         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3749                 goto out;
3750 
3751         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3752             idev->cnf.accept_dad < 1 ||
3753             !(ifp->flags&IFA_F_TENTATIVE) ||
3754             ifp->flags & IFA_F_NODAD) {
3755                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3756                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3757                 spin_unlock(&ifp->lock);
3758                 read_unlock_bh(&idev->lock);
3759 
3760                 addrconf_dad_completed(ifp, bump_id);
3761                 return;
3762         }
3763 
3764         if (!(idev->if_flags & IF_READY)) {
3765                 spin_unlock(&ifp->lock);
3766                 read_unlock_bh(&idev->lock);
3767                 /*
3768                  * If the device is not ready:
3769                  * - keep it tentative if it is a permanent address.
3770                  * - otherwise, kill it.
3771                  */
3772                 in6_ifa_hold(ifp);
3773                 addrconf_dad_stop(ifp, 0);
3774                 return;
3775         }
3776 
3777         /*
3778          * Optimistic nodes can start receiving
3779          * Frames right away
3780          */
3781         if (ifp->flags & IFA_F_OPTIMISTIC) {
3782                 ip6_ins_rt(ifp->rt);
3783                 if (ipv6_use_optimistic_addr(idev)) {
3784                         /* Because optimistic nodes can use this address,
3785                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3786                          */
3787                         notify = true;
3788                 }
3789         }
3790 
3791         addrconf_dad_kick(ifp);
3792 out:
3793         spin_unlock(&ifp->lock);
3794         read_unlock_bh(&idev->lock);
3795         if (notify)
3796                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3797 }
3798 
3799 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3800 {
3801         bool begin_dad = false;
3802 
3803         spin_lock_bh(&ifp->lock);
3804         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3805                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3806                 begin_dad = true;
3807         }
3808         spin_unlock_bh(&ifp->lock);
3809 
3810         if (begin_dad)
3811                 addrconf_mod_dad_work(ifp, 0);
3812 }
3813 
3814 static void addrconf_dad_work(struct work_struct *w)
3815 {
3816         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3817                                                 struct inet6_ifaddr,
3818                                                 dad_work);
3819         struct inet6_dev *idev = ifp->idev;
3820         bool bump_id, disable_ipv6 = false;
3821         struct in6_addr mcaddr;
3822 
3823         enum {
3824                 DAD_PROCESS,
3825                 DAD_BEGIN,
3826                 DAD_ABORT,
3827         } action = DAD_PROCESS;
3828 
3829         rtnl_lock();
3830 
3831         spin_lock_bh(&ifp->lock);
3832         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3833                 action = DAD_BEGIN;
3834                 ifp->state = INET6_IFADDR_STATE_DAD;
3835         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3836                 action = DAD_ABORT;
3837                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3838 
3839                 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3840                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3841                         struct in6_addr addr;
3842 
3843                         addr.s6_addr32[0] = htonl(0xfe800000);
3844                         addr.s6_addr32[1] = 0;
3845 
3846                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3847                             ipv6_addr_equal(&ifp->addr, &addr)) {
3848                                 /* DAD failed for link-local based on MAC */
3849                                 idev->cnf.disable_ipv6 = 1;
3850 
3851                                 pr_info("%s: IPv6 being disabled!\n",
3852                                         ifp->idev->dev->name);
3853                                 disable_ipv6 = true;
3854                         }
3855                 }
3856         }
3857         spin_unlock_bh(&ifp->lock);
3858 
3859         if (action == DAD_BEGIN) {
3860                 addrconf_dad_begin(ifp);
3861                 goto out;
3862         } else if (action == DAD_ABORT) {
3863                 in6_ifa_hold(ifp);
3864                 addrconf_dad_stop(ifp, 1);
3865                 if (disable_ipv6)
3866                         addrconf_ifdown(idev->dev, 0);
3867                 goto out;
3868         }
3869 
3870         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3871                 goto out;
3872 
3873         write_lock_bh(&idev->lock);
3874         if (idev->dead || !(idev->if_flags & IF_READY)) {
3875                 write_unlock_bh(&idev->lock);
3876                 goto out;
3877         }
3878 
3879         spin_lock(&ifp->lock);
3880         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3881                 spin_unlock(&ifp->lock);
3882                 write_unlock_bh(&idev->lock);
3883                 goto out;
3884         }
3885 
3886         if (ifp->dad_probes == 0) {
3887                 /*
3888                  * DAD was successful
3889                  */
3890 
3891                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3892                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3893                 spin_unlock(&ifp->lock);
3894                 write_unlock_bh(&idev->lock);
3895 
3896                 addrconf_dad_completed(ifp, bump_id);
3897 
3898                 goto out;
3899         }
3900 
3901         ifp->dad_probes--;
3902         addrconf_mod_dad_work(ifp,
3903                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3904         spin_unlock(&ifp->lock);
3905         write_unlock_bh(&idev->lock);
3906 
3907         /* send a neighbour solicitation for our addr */
3908         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3909         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3910 out:
3911         in6_ifa_put(ifp);
3912         rtnl_unlock();
3913 }
3914 
3915 /* ifp->idev must be at least read locked */
3916 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3917 {
3918         struct inet6_ifaddr *ifpiter;
3919         struct inet6_dev *idev = ifp->idev;
3920 
3921         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3922                 if (ifpiter->scope > IFA_LINK)
3923                         break;
3924                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3925                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3926                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3927                     IFA_F_PERMANENT)
3928                         return false;
3929         }
3930         return true;
3931 }
3932 
3933 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
3934 {
3935         struct net_device *dev = ifp->idev->dev;
3936         struct in6_addr lladdr;
3937         bool send_rs, send_mld;
3938 
3939         addrconf_del_dad_work(ifp);
3940 
3941         /*
3942          *      Configure the address for reception. Now it is valid.
3943          */
3944 
3945         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3946 
3947         /* If added prefix is link local and we are prepared to process
3948            router advertisements, start sending router solicitations.
3949          */
3950 
3951         read_lock_bh(&ifp->idev->lock);
3952         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3953         send_rs = send_mld &&
3954                   ipv6_accept_ra(ifp->idev) &&
3955                   ifp->idev->cnf.rtr_solicits > 0 &&
3956                   (dev->flags&IFF_LOOPBACK) == 0;
3957         read_unlock_bh(&ifp->idev->lock);
3958 
3959         /* While dad is in progress mld report's source address is in6_addrany.
3960          * Resend with proper ll now.
3961          */
3962         if (send_mld)
3963                 ipv6_mc_dad_complete(ifp->idev);
3964 
3965         if (send_rs) {
3966                 /*
3967                  *      If a host as already performed a random delay
3968                  *      [...] as part of DAD [...] there is no need
3969                  *      to delay again before sending the first RS
3970                  */
3971                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3972                         return;
3973                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3974 
3975                 write_lock_bh(&ifp->idev->lock);
3976                 spin_lock(&ifp->lock);
3977                 ifp->idev->rs_probes = 1;
3978                 ifp->idev->if_flags |= IF_RS_SENT;
3979                 addrconf_mod_rs_timer(ifp->idev,
3980                                       ifp->idev->cnf.rtr_solicit_interval);
3981                 spin_unlock(&ifp->lock);
3982                 write_unlock_bh(&ifp->idev->lock);
3983         }
3984 
3985         if (bump_id)
3986                 rt_genid_bump_ipv6(dev_net(dev));
3987 }
3988 
3989 static void addrconf_dad_run(struct inet6_dev *idev)
3990 {
3991         struct inet6_ifaddr *ifp;
3992 
3993         read_lock_bh(&idev->lock);
3994         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3995                 spin_lock(&ifp->lock);
3996                 if (ifp->flags & IFA_F_TENTATIVE &&
3997                     ifp->state == INET6_IFADDR_STATE_DAD)
3998                         addrconf_dad_kick(ifp);
3999                 spin_unlock(&ifp->lock);
4000         }
4001         read_unlock_bh(&idev->lock);
4002 }
4003 
4004 #ifdef CONFIG_PROC_FS
4005 struct if6_iter_state {
4006         struct seq_net_private p;
4007         int bucket;
4008         int offset;
4009 };
4010 
4011 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4012 {
4013         struct inet6_ifaddr *ifa = NULL;
4014         struct if6_iter_state *state = seq->private;
4015         struct net *net = seq_file_net(seq);
4016         int p = 0;
4017 
4018         /* initial bucket if pos is 0 */
4019         if (pos == 0) {
4020                 state->bucket = 0;
4021                 state->offset = 0;
4022         }
4023 
4024         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4025                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4026                                          addr_lst) {
4027                         if (!net_eq(dev_net(ifa->idev->dev), net))
4028                                 continue;
4029                         /* sync with offset */
4030                         if (p < state->offset) {
4031                                 p++;
4032                                 continue;
4033                         }
4034                         state->offset++;
4035                         return ifa;
4036                 }
4037 
4038                 /* prepare for next bucket */
4039                 state->offset = 0;
4040                 p = 0;
4041         }
4042         return NULL;
4043 }
4044 
4045 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4046                                          struct inet6_ifaddr *ifa)
4047 {
4048         struct if6_iter_state *state = seq->private;
4049         struct net *net = seq_file_net(seq);
4050 
4051         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4052                 if (!net_eq(dev_net(ifa->idev->dev), net))
4053                         continue;
4054                 state->offset++;
4055                 return ifa;
4056         }
4057 
4058         while (++state->bucket < IN6_ADDR_HSIZE) {
4059                 state->offset = 0;
4060                 hlist_for_each_entry_rcu_bh(ifa,
4061                                      &inet6_addr_lst[state->bucket], addr_lst) {
4062                         if (!net_eq(dev_net(ifa->idev->dev), net))
4063                                 continue;
4064                         state->offset++;
4065                         return ifa;
4066                 }
4067         }
4068 
4069         return NULL;
4070 }
4071 
4072 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4073         __acquires(rcu_bh)
4074 {
4075         rcu_read_lock_bh();
4076         return if6_get_first(seq, *pos);
4077 }
4078 
4079 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4080 {
4081         struct inet6_ifaddr *ifa;
4082 
4083         ifa = if6_get_next(seq, v);
4084         ++*pos;
4085         return ifa;
4086 }
4087 
4088 static void if6_seq_stop(struct seq_file *seq, void *v)
4089         __releases(rcu_bh)
4090 {
4091         rcu_read_unlock_bh();
4092 }
4093 
4094 static int if6_seq_show(struct seq_file *seq, void *v)
4095 {
4096         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4097         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4098                    &ifp->addr,
4099                    ifp->idev->dev->ifindex,
4100                    ifp->prefix_len,
4101                    ifp->scope,
4102                    (u8) ifp->flags,
4103                    ifp->idev->dev->name);
4104         return 0;
4105 }
4106 
4107 static const struct seq_operations if6_seq_ops = {
4108         .start  = if6_seq_start,
4109         .next   = if6_seq_next,
4110         .show   = if6_seq_show,
4111         .stop   = if6_seq_stop,
4112 };
4113 
4114 static int if6_seq_open(struct inode *inode, struct file *file)
4115 {
4116         return seq_open_net(inode, file, &if6_seq_ops,
4117                             sizeof(struct if6_iter_state));
4118 }
4119 
4120 static const struct file_operations if6_fops = {
4121         .owner          = THIS_MODULE,
4122         .open           = if6_seq_open,
4123         .read           = seq_read,
4124         .llseek         = seq_lseek,
4125         .release        = seq_release_net,
4126 };
4127 
4128 static int __net_init if6_proc_net_init(struct net *net)
4129 {
4130         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4131                 return -ENOMEM;
4132         return 0;
4133 }
4134 
4135 static void __net_exit if6_proc_net_exit(struct net *net)
4136 {
4137         remove_proc_entry("if_inet6", net->proc_net);
4138 }
4139 
4140 static struct pernet_operations if6_proc_net_ops = {
4141         .init = if6_proc_net_init,
4142         .exit = if6_proc_net_exit,
4143 };
4144 
4145 int __init if6_proc_init(void)
4146 {
4147         return register_pernet_subsys(&if6_proc_net_ops);
4148 }
4149 
4150 void if6_proc_exit(void)
4151 {
4152         unregister_pernet_subsys(&if6_proc_net_ops);
4153 }
4154 #endif  /* CONFIG_PROC_FS */
4155 
4156 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4157 /* Check if address is a home address configured on any interface. */
4158 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4159 {
4160         int ret = 0;
4161         struct inet6_ifaddr *ifp = NULL;
4162         unsigned int hash = inet6_addr_hash(addr);
4163 
4164         rcu_read_lock_bh();
4165         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4166                 if (!net_eq(dev_net(ifp->idev->dev), net))
4167                         continue;
4168                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4169                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4170                         ret = 1;
4171                         break;
4172                 }
4173         }
4174         rcu_read_unlock_bh();
4175         return ret;
4176 }
4177 #endif
4178 
4179 /*
4180  *      Periodic address status verification
4181  */
4182 
4183 static void addrconf_verify_rtnl(void)
4184 {
4185         unsigned long now, next, next_sec, next_sched;
4186         struct inet6_ifaddr *ifp;
4187         int i;
4188 
4189         ASSERT_RTNL();
4190 
4191         rcu_read_lock_bh();
4192         now = jiffies;
4193         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4194 
4195         cancel_delayed_work(&addr_chk_work);
4196 
4197         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4198 restart:
4199                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4200                         unsigned long age;
4201 
4202                         /* When setting preferred_lft to a value not zero or
4203                          * infinity, while valid_lft is infinity
4204                          * IFA_F_PERMANENT has a non-infinity life time.
4205                          */
4206                         if ((ifp->flags & IFA_F_PERMANENT) &&
4207                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4208                                 continue;
4209 
4210                         spin_lock(&ifp->lock);
4211                         /* We try to batch several events at once. */
4212                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4213 
4214                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4215                             age >= ifp->valid_lft) {
4216                                 spin_unlock(&ifp->lock);
4217                                 in6_ifa_hold(ifp);
4218                                 ipv6_del_addr(ifp);
4219                                 goto restart;
4220                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4221                                 spin_unlock(&ifp->lock);
4222                                 continue;
4223                         } else if (age >= ifp->prefered_lft) {
4224                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4225                                 int deprecate = 0;
4226 
4227                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4228                                         deprecate = 1;
4229                                         ifp->flags |= IFA_F_DEPRECATED;
4230                                 }
4231 
4232                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4233                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4234                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4235 
4236                                 spin_unlock(&ifp->lock);
4237 
4238                                 if (deprecate) {
4239                                         in6_ifa_hold(ifp);
4240 
4241                                         ipv6_ifa_notify(0, ifp);
4242                                         in6_ifa_put(ifp);
4243                                         goto restart;
4244                                 }
4245                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4246                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4247                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4248                                         ifp->idev->cnf.dad_transmits *
4249                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4250 
4251                                 if (age >= ifp->prefered_lft - regen_advance) {
4252                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4253                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4254                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4255                                         if (!ifp->regen_count && ifpub) {
4256                                                 ifp->regen_count++;
4257                                                 in6_ifa_hold(ifp);
4258                                                 in6_ifa_hold(ifpub);
4259                                                 spin_unlock(&ifp->lock);
4260 
4261                                                 spin_lock(&ifpub->lock);
4262                                                 ifpub->regen_count = 0;
4263                                                 spin_unlock(&ifpub->lock);
4264                                                 ipv6_create_tempaddr(ifpub, ifp);
4265                                                 in6_ifa_put(ifpub);
4266                                                 in6_ifa_put(ifp);
4267                                                 goto restart;
4268                                         }
4269                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4270                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4271                                 spin_unlock(&ifp->lock);
4272                         } else {
4273                                 /* ifp->prefered_lft <= ifp->valid_lft */
4274                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4275                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4276                                 spin_unlock(&ifp->lock);
4277                         }
4278                 }
4279         }
4280 
4281         next_sec = round_jiffies_up(next);
4282         next_sched = next;
4283 
4284         /* If rounded timeout is accurate enough, accept it. */
4285         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4286                 next_sched = next_sec;
4287 
4288         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4289         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4290                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4291 
4292         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4293               now, next, next_sec, next_sched);
4294         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4295         rcu_read_unlock_bh();
4296 }
4297 
4298 static void addrconf_verify_work(struct work_struct *w)
4299 {
4300         rtnl_lock();
4301         addrconf_verify_rtnl();
4302         rtnl_unlock();
4303 }
4304 
4305 static void addrconf_verify(void)
4306 {
4307         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4308 }
4309 
4310 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4311                                      struct in6_addr **peer_pfx)
4312 {
4313         struct in6_addr *pfx = NULL;
4314 
4315         *peer_pfx = NULL;
4316 
4317         if (addr)
4318                 pfx = nla_data(addr);
4319 
4320         if (local) {
4321                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4322                         *peer_pfx = pfx;
4323                 pfx = nla_data(local);
4324         }
4325 
4326         return pfx;
4327 }
4328 
4329 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4330         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4331         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4332         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4333         [IFA_FLAGS]             = { .len = sizeof(u32) },
4334 };
4335 
4336 static int
4337 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4338 {
4339         struct net *net = sock_net(skb->sk);
4340         struct ifaddrmsg *ifm;
4341         struct nlattr *tb[IFA_MAX+1];
4342         struct in6_addr *pfx, *peer_pfx;
4343         u32 ifa_flags;
4344         int err;
4345 
4346         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4347         if (err < 0)
4348                 return err;
4349 
4350         ifm = nlmsg_data(nlh);
4351         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4352         if (!pfx)
4353                 return -EINVAL;
4354 
4355         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4356 
4357         /* We ignore other flags so far. */
4358         ifa_flags &= IFA_F_MANAGETEMPADDR;
4359 
4360         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4361                               ifm->ifa_prefixlen);
4362 }
4363 
4364 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4365                              u32 prefered_lft, u32 valid_lft)
4366 {
4367         u32 flags;
4368         clock_t expires;
4369         unsigned long timeout;
4370         bool was_managetempaddr;
4371         bool had_prefixroute;
4372 
4373         ASSERT_RTNL();
4374 
4375         if (!valid_lft || (prefered_lft > valid_lft))
4376                 return -EINVAL;
4377 
4378         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4379             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4380                 return -EINVAL;
4381 
4382         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4383         if (addrconf_finite_timeout(timeout)) {
4384                 expires = jiffies_to_clock_t(timeout * HZ);
4385                 valid_lft = timeout;
4386                 flags = RTF_EXPIRES;
4387         } else {
4388                 expires = 0;
4389                 flags = 0;
4390                 ifa_flags |= IFA_F_PERMANENT;
4391         }
4392 
4393         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4394         if (addrconf_finite_timeout(timeout)) {
4395                 if (timeout == 0)
4396                         ifa_flags |= IFA_F_DEPRECATED;
4397                 prefered_lft = timeout;
4398         }
4399 
4400         spin_lock_bh(&ifp->lock);
4401         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4402         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4403                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4404         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4405                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4406                         IFA_F_NOPREFIXROUTE);
4407         ifp->flags |= ifa_flags;
4408         ifp->tstamp = jiffies;
4409         ifp->valid_lft = valid_lft;
4410         ifp->prefered_lft = prefered_lft;
4411 
4412         spin_unlock_bh(&ifp->lock);
4413         if (!(ifp->flags&IFA_F_TENTATIVE))
4414                 ipv6_ifa_notify(0, ifp);
4415 
4416         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4417                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4418                                       expires, flags);
4419         } else if (had_prefixroute) {
4420                 enum cleanup_prefix_rt_t action;
4421                 unsigned long rt_expires;
4422 
4423                 write_lock_bh(&ifp->idev->lock);
4424                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4425                 write_unlock_bh(&ifp->idev->lock);
4426 
4427                 if (action != CLEANUP_PREFIX_RT_NOP) {
4428                         cleanup_prefix_route(ifp, rt_expires,
4429                                 action == CLEANUP_PREFIX_RT_DEL);
4430                 }
4431         }
4432 
4433         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4434                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4435                         valid_lft = prefered_lft = 0;
4436                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4437                                  !was_managetempaddr, jiffies);
4438         }
4439 
4440         addrconf_verify_rtnl();
4441 
4442         return 0;
4443 }
4444 
4445 static int
4446 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4447 {
4448         struct net *net = sock_net(skb->sk);
4449         struct ifaddrmsg *ifm;
4450         struct nlattr *tb[IFA_MAX+1];
4451         struct in6_addr *pfx, *peer_pfx;
4452         struct inet6_ifaddr *ifa;
4453         struct net_device *dev;
4454         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4455         u32 ifa_flags;
4456         int err;
4457 
4458         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4459         if (err < 0)
4460                 return err;
4461 
4462         ifm = nlmsg_data(nlh);
4463         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4464         if (!pfx)
4465                 return -EINVAL;
4466 
4467         if (tb[IFA_CACHEINFO]) {
4468                 struct ifa_cacheinfo *ci;
4469 
4470                 ci = nla_data(tb[IFA_CACHEINFO]);
4471                 valid_lft = ci->ifa_valid;
4472                 preferred_lft = ci->ifa_prefered;
4473         } else {
4474                 preferred_lft = INFINITY_LIFE_TIME;
4475                 valid_lft = INFINITY_LIFE_TIME;
4476         }
4477 
4478         dev =  __dev_get_by_index(net, ifm->ifa_index);
4479         if (!dev)
4480                 return -ENODEV;
4481 
4482         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4483 
4484         /* We ignore other flags so far. */
4485         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4486                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4487 
4488         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4489         if (!ifa) {
4490                 /*
4491                  * It would be best to check for !NLM_F_CREATE here but
4492                  * userspace already relies on not having to provide this.
4493                  */
4494                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4495                                       ifm->ifa_prefixlen, ifa_flags,
4496                                       preferred_lft, valid_lft);
4497         }
4498 
4499         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4500             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4501                 err = -EEXIST;
4502         else
4503                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4504 
4505         in6_ifa_put(ifa);
4506 
4507         return err;
4508 }
4509 
4510 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4511                           u8 scope, int ifindex)
4512 {
4513         struct ifaddrmsg *ifm;
4514 
4515         ifm = nlmsg_data(nlh);
4516         ifm->ifa_family = AF_INET6;
4517         ifm->ifa_prefixlen = prefixlen;
4518         ifm->ifa_flags = flags;
4519         ifm->ifa_scope = scope;
4520         ifm->ifa_index = ifindex;
4521 }
4522 
4523 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4524                          unsigned long tstamp, u32 preferred, u32 valid)
4525 {
4526         struct ifa_cacheinfo ci;
4527 
4528         ci.cstamp = cstamp_delta(cstamp);
4529         ci.tstamp = cstamp_delta(tstamp);
4530         ci.ifa_prefered = preferred;
4531         ci.ifa_valid = valid;
4532 
4533         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4534 }
4535 
4536 static inline int rt_scope(int ifa_scope)
4537 {
4538         if (ifa_scope & IFA_HOST)
4539                 return RT_SCOPE_HOST;
4540         else if (ifa_scope & IFA_LINK)
4541                 return RT_SCOPE_LINK;
4542         else if (ifa_scope & IFA_SITE)
4543                 return RT_SCOPE_SITE;
4544         else
4545                 return RT_SCOPE_UNIVERSE;
4546 }
4547 
4548 static inline int inet6_ifaddr_msgsize(void)
4549 {
4550         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4551                + nla_total_size(16) /* IFA_LOCAL */
4552                + nla_total_size(16) /* IFA_ADDRESS */
4553                + nla_total_size(sizeof(struct ifa_cacheinfo))
4554                + nla_total_size(4)  /* IFA_FLAGS */;
4555 }
4556 
4557 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4558                              u32 portid, u32 seq, int event, unsigned int flags)
4559 {
4560         struct nlmsghdr  *nlh;
4561         u32 preferred, valid;
4562 
4563         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4564         if (!nlh)
4565                 return -EMSGSIZE;
4566 
4567         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4568                       ifa->idev->dev->ifindex);
4569 
4570         if (!((ifa->flags&IFA_F_PERMANENT) &&
4571               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4572                 preferred = ifa->prefered_lft;
4573                 valid = ifa->valid_lft;
4574                 if (preferred != INFINITY_LIFE_TIME) {
4575                         long tval = (jiffies - ifa->tstamp)/HZ;
4576                         if (preferred > tval)
4577                                 preferred -= tval;
4578                         else
4579                                 preferred = 0;
4580                         if (valid != INFINITY_LIFE_TIME) {
4581                                 if (valid > tval)
4582                                         valid -= tval;
4583                                 else
4584                                         valid = 0;
4585                         }
4586                 }
4587         } else {
4588                 preferred = INFINITY_LIFE_TIME;
4589                 valid = INFINITY_LIFE_TIME;
4590         }
4591 
4592         if (!ipv6_addr_any(&ifa->peer_addr)) {
4593                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4594                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4595                         goto error;
4596         } else
4597                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4598                         goto error;
4599 
4600         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4601                 goto error;
4602 
4603         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4604                 goto error;
4605 
4606         nlmsg_end(skb, nlh);
4607         return 0;
4608 
4609 error:
4610         nlmsg_cancel(skb, nlh);
4611         return -EMSGSIZE;
4612 }
4613 
4614 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4615                                 u32 portid, u32 seq, int event, u16 flags)
4616 {
4617         struct nlmsghdr  *nlh;
4618         u8 scope = RT_SCOPE_UNIVERSE;
4619         int ifindex = ifmca->idev->dev->ifindex;
4620 
4621         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4622                 scope = RT_SCOPE_SITE;
4623 
4624         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4625         if (!nlh)
4626                 return -EMSGSIZE;
4627 
4628         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4629         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4630             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4631                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4632                 nlmsg_cancel(skb, nlh);
4633                 return -EMSGSIZE;
4634         }
4635 
4636         nlmsg_end(skb, nlh);
4637         return 0;
4638 }
4639 
4640 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4641                                 u32 portid, u32 seq, int event, unsigned int flags)
4642 {
4643         struct nlmsghdr  *nlh;
4644         u8 scope = RT_SCOPE_UNIVERSE;
4645         int ifindex = ifaca->aca_idev->dev->ifindex;
4646 
4647         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4648                 scope = RT_SCOPE_SITE;
4649 
4650         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4651         if (!nlh)
4652                 return -EMSGSIZE;
4653 
4654         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4655         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4656             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4657                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4658                 nlmsg_cancel(skb, nlh);
4659                 return -EMSGSIZE;
4660         }
4661 
4662         nlmsg_end(skb, nlh);
4663         return 0;
4664 }
4665 
4666 enum addr_type_t {
4667         UNICAST_ADDR,
4668         MULTICAST_ADDR,
4669         ANYCAST_ADDR,
4670 };
4671 
4672 /* called with rcu_read_lock() */
4673 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4674                           struct netlink_callback *cb, enum addr_type_t type,
4675                           int s_ip_idx, int *p_ip_idx)
4676 {
4677         struct ifmcaddr6 *ifmca;
4678         struct ifacaddr6 *ifaca;
4679         int err = 1;
4680         int ip_idx = *p_ip_idx;
4681 
4682         read_lock_bh(&idev->lock);
4683         switch (type) {
4684         case UNICAST_ADDR: {
4685                 struct inet6_ifaddr *ifa;
4686 
4687                 /* unicast address incl. temp addr */
4688                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4689                         if (++ip_idx < s_ip_idx)
4690                                 continue;
4691                         err = inet6_fill_ifaddr(skb, ifa,
4692                                                 NETLINK_CB(cb->skb).portid,
4693                                                 cb->nlh->nlmsg_seq,
4694                                                 RTM_NEWADDR,
4695                                                 NLM_F_MULTI);
4696                         if (err < 0)
4697                                 break;
4698                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4699                 }
4700                 break;
4701         }
4702         case MULTICAST_ADDR:
4703                 /* multicast address */
4704                 for (ifmca = idev->mc_list; ifmca;
4705                      ifmca = ifmca->next, ip_idx++) {
4706                         if (ip_idx < s_ip_idx)
4707                                 continue;
4708                         err = inet6_fill_ifmcaddr(skb, ifmca,
4709                                                   NETLINK_CB(cb->skb).portid,
4710                                                   cb->nlh->nlmsg_seq,
4711                                                   RTM_GETMULTICAST,
4712                                                   NLM_F_MULTI);
4713                         if (err < 0)
4714                                 break;
4715                 }
4716                 break;
4717         case ANYCAST_ADDR:
4718                 /* anycast address */
4719                 for (ifaca = idev->ac_list; ifaca;
4720                      ifaca = ifaca->aca_next, ip_idx++) {
4721                         if (ip_idx < s_ip_idx)
4722                                 continue;
4723                         err = inet6_fill_ifacaddr(skb, ifaca,
4724                                                   NETLINK_CB(cb->skb).portid,
4725                                                   cb->nlh->nlmsg_seq,
4726                                                   RTM_GETANYCAST,
4727                                                   NLM_F_MULTI);
4728                         if (err < 0)
4729                                 break;
4730                 }
4731                 break;
4732         default:
4733                 break;
4734         }
4735         read_unlock_bh(&idev->lock);
4736         *p_ip_idx = ip_idx;
4737         return err;
4738 }
4739 
4740 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4741                            enum addr_type_t type)
4742 {
4743         struct net *net = sock_net(skb->sk);
4744         int h, s_h;
4745         int idx, ip_idx;
4746         int s_idx, s_ip_idx;
4747         struct net_device *dev;
4748         struct inet6_dev *idev;
4749         struct hlist_head *head;
4750 
4751         s_h = cb->args[0];
4752         s_idx = idx = cb->args[1];
4753         s_ip_idx = ip_idx = cb->args[2];
4754 
4755         rcu_read_lock();
4756         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4757         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4758                 idx = 0;
4759                 head = &net->dev_index_head[h];
4760                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4761                         if (idx < s_idx)
4762                                 goto cont;
4763                         if (h > s_h || idx > s_idx)
4764                                 s_ip_idx = 0;
4765                         ip_idx = 0;
4766                         idev = __in6_dev_get(dev);
4767                         if (!idev)
4768                                 goto cont;
4769 
4770                         if (in6_dump_addrs(idev, skb, cb, type,
4771                                            s_ip_idx, &ip_idx) < 0)
4772                                 goto done;
4773 cont:
4774                         idx++;
4775                 }
4776         }
4777 done:
4778         rcu_read_unlock();
4779         cb->args[0] = h;
4780         cb->args[1] = idx;
4781         cb->args[2] = ip_idx;
4782 
4783         return skb->len;
4784 }
4785 
4786 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4787 {
4788         enum addr_type_t type = UNICAST_ADDR;
4789 
4790         return inet6_dump_addr(skb, cb, type);
4791 }
4792 
4793 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4794 {
4795         enum addr_type_t type = MULTICAST_ADDR;
4796 
4797         return inet6_dump_addr(skb, cb, type);
4798 }
4799 
4800 
4801 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4802 {
4803         enum addr_type_t type = ANYCAST_ADDR;
4804 
4805         return inet6_dump_addr(skb, cb, type);
4806 }
4807 
4808 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4809 {
4810         struct net *net = sock_net(in_skb->sk);
4811         struct ifaddrmsg *ifm;
4812         struct nlattr *tb[IFA_MAX+1];
4813         struct in6_addr *addr = NULL, *peer;
4814         struct net_device *dev = NULL;
4815         struct inet6_ifaddr *ifa;
4816         struct sk_buff *skb;
4817         int err;
4818 
4819         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4820         if (err < 0)
4821                 goto errout;
4822 
4823         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4824         if (!addr) {
4825                 err = -EINVAL;
4826                 goto errout;
4827         }
4828 
4829         ifm = nlmsg_data(nlh);
4830         if (ifm->ifa_index)
4831                 dev = __dev_get_by_index(net, ifm->ifa_index);
4832 
4833         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4834         if (!ifa) {
4835                 err = -EADDRNOTAVAIL;
4836                 goto errout;
4837         }
4838 
4839         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4840         if (!skb) {
4841                 err = -ENOBUFS;
4842                 goto errout_ifa;
4843         }
4844 
4845         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4846                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4847         if (err < 0) {
4848                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4849                 WARN_ON(err == -EMSGSIZE);
4850                 kfree_skb(skb);
4851                 goto errout_ifa;
4852         }
4853         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4854 errout_ifa:
4855         in6_ifa_put(ifa);
4856 errout:
4857         return err;
4858 }
4859 
4860 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4861 {
4862         struct sk_buff *skb;
4863         struct net *net = dev_net(ifa->idev->dev);
4864         int err = -ENOBUFS;
4865 
4866         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4867         if (!skb)
4868                 goto errout;
4869 
4870         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4871         if (err < 0) {
4872                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4873                 WARN_ON(err == -EMSGSIZE);
4874                 kfree_skb(skb);
4875                 goto errout;
4876         }
4877         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4878         return;
4879 errout:
4880         if (err < 0)
4881                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4882 }
4883 
4884 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4885                                 __s32 *array, int bytes)
4886 {
4887         BUG_ON(bytes < (DEVCONF_MAX * 4));
4888 
4889         memset(array, 0, bytes);
4890         array[DEVCONF_FORWARDING] = cnf->forwarding;
4891         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4892         array[DEVCONF_MTU6] = cnf->mtu6;
4893         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4894         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4895         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4896         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4897         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4898         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4899                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4900         array[DEVCONF_RTR_SOLICIT_DELAY] =
4901                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4902         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4903         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4904                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4905         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4906                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4907         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4908         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4909         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4910         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4911         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4912         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4913         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4914         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4915         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4916 #ifdef CONFIG_IPV6_ROUTER_PREF
4917         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4918         array[DEVCONF_RTR_PROBE_INTERVAL] =
4919                 jiffies_to_msecs(cnf->rtr_probe_interval);
4920 #ifdef CONFIG_IPV6_ROUTE_INFO
4921         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4922 #endif
4923 #endif
4924         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4925         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4926 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4927         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4928         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4929 #endif
4930 #ifdef CONFIG_IPV6_MROUTE
4931         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4932 #endif
4933         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4934         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4935         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4936         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4937         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4938         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4939         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4940         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4941         /* we omit DEVCONF_STABLE_SECRET for now */
4942         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4943         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4944         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4945         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4946 }
4947 
4948 static inline size_t inet6_ifla6_size(void)
4949 {
4950         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4951              + nla_total_size(sizeof(struct ifla_cacheinfo))
4952              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4953              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4954              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4955              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4956 }
4957 
4958 static inline size_t inet6_if_nlmsg_size(void)
4959 {
4960         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4961                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4962                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4963                + nla_total_size(4) /* IFLA_MTU */
4964                + nla_total_size(4) /* IFLA_LINK */
4965                + nla_total_size(1) /* IFLA_OPERSTATE */
4966                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4967 }
4968 
4969 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4970                                       int items, int bytes)
4971 {
4972         int i;
4973         int pad = bytes - sizeof(u64) * items;
4974         BUG_ON(pad < 0);
4975 
4976         /* Use put_unaligned() because stats may not be aligned for u64. */
4977         put_unaligned(items, &stats[0]);
4978         for (i = 1; i < items; i++)
4979                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4980 
4981         memset(&stats[items], 0, pad);
4982 }
4983 
4984 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4985                                         int bytes, size_t syncpoff)
4986 {
4987         int i, c;
4988         u64 buff[IPSTATS_MIB_MAX];
4989         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4990 
4991         BUG_ON(pad < 0);
4992 
4993         memset(buff, 0, sizeof(buff));
4994         buff[0] = IPSTATS_MIB_MAX;
4995 
4996         for_each_possible_cpu(c) {
4997                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4998                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4999         }
5000 
5001         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5002         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5003 }
5004 
5005 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5006                              int bytes)
5007 {
5008         switch (attrtype) {
5009         case IFLA_INET6_STATS:
5010                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5011                                      offsetof(struct ipstats_mib, syncp));
5012                 break;
5013         case IFLA_INET6_ICMP6STATS:
5014                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
5015                 break;
5016         }
5017 }
5018 
5019 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5020                                   u32 ext_filter_mask)
5021 {
5022         struct nlattr *nla;
5023         struct ifla_cacheinfo ci;
5024 
5025         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5026                 goto nla_put_failure;
5027         ci.max_reasm_len = IPV6_MAXPLEN;
5028         ci.tstamp = cstamp_delta(idev->tstamp);
5029         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5030         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5031         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5032                 goto nla_put_failure;
5033         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5034         if (!nla)
5035                 goto nla_put_failure;
5036         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5037 
5038         /* XXX - MC not implemented */
5039 
5040         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5041                 return 0;
5042 
5043         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5044         if (!nla)
5045                 goto nla_put_failure;
5046         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5047 
5048         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5049         if (!nla)
5050                 goto nla_put_failure;
5051         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5052 
5053         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5054         if (!nla)
5055                 goto nla_put_failure;
5056 
5057         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
5058                 goto nla_put_failure;
5059 
5060         read_lock_bh(&idev->lock);
5061         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5062         read_unlock_bh(&idev->lock);
5063 
5064         return 0;
5065 
5066 nla_put_failure:
5067         return -EMSGSIZE;
5068 }
5069 
5070 static size_t inet6_get_link_af_size(const struct net_device *dev,
5071                                      u32 ext_filter_mask)
5072 {
5073         if (!__in6_dev_get(dev))
5074                 return 0;
5075 
5076         return inet6_ifla6_size();
5077 }
5078 
5079 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5080                               u32 ext_filter_mask)
5081 {
5082         struct inet6_dev *idev = __in6_dev_get(dev);
5083 
5084         if (!idev)
5085                 return -ENODATA;
5086 
5087         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5088                 return -EMSGSIZE;
5089 
5090         return 0;
5091 }
5092 
5093 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5094 {
5095         struct inet6_ifaddr *ifp;
5096         struct net_device *dev = idev->dev;
5097         bool clear_token, update_rs = false;
5098         struct in6_addr ll_addr;
5099 
5100         ASSERT_RTNL();
5101 
5102         if (!token)
5103                 return -EINVAL;
5104         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5105                 return -EINVAL;
5106         if (!ipv6_accept_ra(idev))
5107                 return -EINVAL;
5108         if (idev->cnf.rtr_solicits <= 0)
5109                 return -EINVAL;
5110 
5111         write_lock_bh(&idev->lock);
5112 
5113         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5114         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5115 
5116         write_unlock_bh(&idev->lock);
5117 
5118         clear_token = ipv6_addr_any(token);
5119         if (clear_token)
5120                 goto update_lft;
5121 
5122         if (!idev->dead && (idev->if_flags & IF_READY) &&
5123             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5124                              IFA_F_OPTIMISTIC)) {
5125                 /* If we're not ready, then normal ifup will take care
5126                  * of this. Otherwise, we need to request our rs here.
5127                  */
5128                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5129                 update_rs = true;
5130         }
5131 
5132 update_lft:
5133         write_lock_bh(&idev->lock);
5134 
5135         if (update_rs) {
5136                 idev->if_flags |= IF_RS_SENT;
5137                 idev->rs_probes = 1;
5138                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
5139         }
5140 
5141         /* Well, that's kinda nasty ... */
5142         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5143                 spin_lock(&ifp->lock);
5144                 if (ifp->tokenized) {
5145                         ifp->valid_lft = 0;
5146                         ifp->prefered_lft = 0;
5147                 }
5148                 spin_unlock(&ifp->lock);
5149         }
5150 
5151         write_unlock_bh(&idev->lock);
5152         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5153         addrconf_verify_rtnl();
5154         return 0;
5155 }
5156 
5157 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5158         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5159         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5160 };
5161 
5162 static int inet6_validate_link_af(const struct net_device *dev,
5163                                   const struct nlattr *nla)
5164 {
5165         struct nlattr *tb[IFLA_INET6_MAX + 1];
5166 
5167         if (dev && !__in6_dev_get(dev))
5168                 return -EAFNOSUPPORT;
5169 
5170         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5171 }
5172 
5173 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5174 {
5175         int err = -EINVAL;
5176         struct inet6_dev *idev = __in6_dev_get(dev);
5177         struct nlattr *tb[IFLA_INET6_MAX + 1];
5178 
5179         if (!idev)
5180                 return -EAFNOSUPPORT;
5181 
5182         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5183                 BUG();
5184 
5185         if (tb[IFLA_INET6_TOKEN]) {
5186                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5187                 if (err)
5188                         return err;
5189         }
5190 
5191         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5192                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5193 
5194                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5195                     mode != IN6_ADDR_GEN_MODE_NONE &&
5196                     mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5197                     mode != IN6_ADDR_GEN_MODE_RANDOM)
5198                         return -EINVAL;
5199 
5200                 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5201                     !idev->cnf.stable_secret.initialized &&
5202                     !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5203                         return -EINVAL;
5204 
5205                 idev->addr_gen_mode = mode;
5206                 err = 0;
5207         }
5208 
5209         return err;
5210 }
5211 
5212 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5213                              u32 portid, u32 seq, int event, unsigned int flags)
5214 {
5215         struct net_device *dev = idev->dev;
5216         struct ifinfomsg *hdr;
5217         struct nlmsghdr *nlh;
5218         void *protoinfo;
5219 
5220         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5221         if (!nlh)
5222                 return -EMSGSIZE;
5223 
5224         hdr = nlmsg_data(nlh);
5225         hdr->ifi_family = AF_INET6;
5226         hdr->__ifi_pad = 0;
5227         hdr->ifi_type = dev->type;
5228         hdr->ifi_index = dev->ifindex;
5229         hdr->ifi_flags = dev_get_flags(dev);
5230         hdr->ifi_change = 0;
5231 
5232         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5233             (dev->addr_len &&
5234              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5235             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5236             (dev->ifindex != dev_get_iflink(dev) &&
5237              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5238             nla_put_u8(skb, IFLA_OPERSTATE,
5239                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5240                 goto nla_put_failure;
5241         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5242         if (!protoinfo)
5243                 goto nla_put_failure;
5244 
5245         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5246                 goto nla_put_failure;
5247 
5248         nla_nest_end(skb, protoinfo);
5249         nlmsg_end(skb, nlh);
5250         return 0;
5251 
5252 nla_put_failure:
5253         nlmsg_cancel(skb, nlh);
5254         return -EMSGSIZE;
5255 }
5256 
5257 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5258 {
5259         struct net *net = sock_net(skb->sk);
5260         int h, s_h;
5261         int idx = 0, s_idx;
5262         struct net_device *dev;
5263         struct inet6_dev *idev;
5264         struct hlist_head *head;
5265 
5266         s_h = cb->args[0];
5267         s_idx = cb->args[1];
5268 
5269         rcu_read_lock();
5270         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5271                 idx = 0;
5272                 head = &net->dev_index_head[h];
5273                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5274                         if (idx < s_idx)
5275                                 goto cont;
5276                         idev = __in6_dev_get(dev);
5277                         if (!idev)
5278                                 goto cont;
5279                         if (inet6_fill_ifinfo(skb, idev,
5280                                               NETLINK_CB(cb->skb).portid,
5281                                               cb->nlh->nlmsg_seq,
5282                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5283                                 goto out;
5284 cont:
5285                         idx++;
5286                 }
5287         }
5288 out:
5289         rcu_read_unlock();
5290         cb->args[1] = idx;
5291         cb->args[0] = h;
5292 
5293         return skb->len;
5294 }
5295 
5296 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5297 {
5298         struct sk_buff *skb;
5299         struct net *net = dev_net(idev->dev);
5300         int err = -ENOBUFS;
5301 
5302         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5303         if (!skb)
5304                 goto errout;
5305 
5306         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5307         if (err < 0) {
5308                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5309                 WARN_ON(err == -EMSGSIZE);
5310                 kfree_skb(skb);
5311                 goto errout;
5312         }
5313         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5314         return;
5315 errout:
5316         if (err < 0)
5317                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5318 }
5319 
5320 static inline size_t inet6_prefix_nlmsg_size(void)
5321 {
5322         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5323                + nla_total_size(sizeof(struct in6_addr))
5324                + nla_total_size(sizeof(struct prefix_cacheinfo));
5325 }
5326 
5327 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5328                              struct prefix_info *pinfo, u32 portid, u32 seq,
5329                              int event, unsigned int flags)
5330 {
5331         struct prefixmsg *pmsg;
5332         struct nlmsghdr *nlh;
5333         struct prefix_cacheinfo ci;
5334 
5335         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5336         if (!nlh)
5337                 return -EMSGSIZE;
5338 
5339         pmsg = nlmsg_data(nlh);
5340         pmsg->prefix_family = AF_INET6;
5341         pmsg->prefix_pad1 = 0;
5342         pmsg->prefix_pad2 = 0;
5343         pmsg->prefix_ifindex = idev->dev->ifindex;
5344         pmsg->prefix_len = pinfo->prefix_len;
5345         pmsg->prefix_type = pinfo->type;
5346         pmsg->prefix_pad3 = 0;
5347         pmsg->prefix_flags = 0;
5348         if (pinfo->onlink)
5349                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5350         if (pinfo->autoconf)
5351                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5352 
5353         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5354                 goto nla_put_failure;
5355         ci.preferred_time = ntohl(pinfo->prefered);
5356         ci.valid_time = ntohl(pinfo->valid);
5357         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5358                 goto nla_put_failure;
5359         nlmsg_end(skb, nlh);
5360         return 0;
5361 
5362 nla_put_failure:
5363         nlmsg_cancel(skb, nlh);
5364         return -EMSGSIZE;
5365 }
5366 
5367 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5368                          struct prefix_info *pinfo)
5369 {
5370         struct sk_buff *skb;
5371         struct net *net = dev_net(idev->dev);
5372         int err = -ENOBUFS;
5373 
5374         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5375         if (!skb)
5376                 goto errout;
5377 
5378         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5379         if (err < 0) {
5380                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5381                 WARN_ON(err == -EMSGSIZE);
5382                 kfree_skb(skb);
5383                 goto errout;
5384         }
5385         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5386         return;
5387 errout:
5388         if (err < 0)
5389                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5390 }
5391 
5392 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5393 {
5394         struct net *net = dev_net(ifp->idev->dev);
5395 
5396         if (event)
5397                 ASSERT_RTNL();
5398 
5399         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5400 
5401         switch (event) {
5402         case RTM_NEWADDR:
5403                 /*
5404                  * If the address was optimistic
5405                  * we inserted the route at the start of
5406                  * our DAD process, so we don't need
5407                  * to do it again
5408                  */
5409                 if (!(ifp->rt->rt6i_node))
5410                         ip6_ins_rt(ifp->rt);
5411                 if (ifp->idev->cnf.forwarding)
5412                         addrconf_join_anycast(ifp);
5413                 if (!ipv6_addr_any(&ifp->peer_addr))
5414                         addrconf_prefix_route(&ifp->peer_addr, 128,
5415                                               ifp->idev->dev, 0, 0);
5416                 break;
5417         case RTM_DELADDR:
5418                 if (ifp->idev->cnf.forwarding)
5419                         addrconf_leave_anycast(ifp);
5420                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5421                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5422                         struct rt6_info *rt;
5423 
5424                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5425                                                        ifp->idev->dev, 0, 0);
5426                         if (rt)
5427                                 ip6_del_rt(rt);
5428                 }
5429                 if (ifp->rt) {
5430                         dst_hold(&ifp->rt->dst);
5431                         ip6_del_rt(ifp->rt);
5432                 }
5433                 rt_genid_bump_ipv6(net);
5434                 break;
5435         }
5436         atomic_inc(&net->ipv6.dev_addr_genid);
5437 }
5438 
5439 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5440 {
5441         rcu_read_lock_bh();
5442         if (likely(ifp->idev->dead == 0))
5443                 __ipv6_ifa_notify(event, ifp);
5444         rcu_read_unlock_bh();
5445 }
5446 
5447 #ifdef CONFIG_SYSCTL
5448 
5449 static
5450 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5451                            void __user *buffer, size_t *lenp, loff_t *ppos)
5452 {
5453         int *valp = ctl->data;
5454         int val = *valp;
5455         loff_t pos = *ppos;
5456         struct ctl_table lctl;
5457         int ret;
5458 
5459         /*
5460          * ctl->data points to idev->cnf.forwarding, we should
5461          * not modify it until we get the rtnl lock.
5462          */
5463         lctl = *ctl;
5464         lctl.data = &val;
5465 
5466         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5467 
5468         if (write)
5469                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5470         if (ret)
5471                 *ppos = pos;
5472         return ret;
5473 }
5474 
5475 static
5476 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5477                               void __user *buffer, size_t *lenp, loff_t *ppos)
5478 {
5479         struct ctl_table lctl;
5480         int min_hl = 1, max_hl = 255;
5481 
5482         lctl = *ctl;
5483         lctl.extra1 = &min_hl;
5484         lctl.extra2 = &max_hl;
5485 
5486         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5487 }
5488 
5489 static
5490 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5491                         void __user *buffer, size_t *lenp, loff_t *ppos)
5492 {
5493         struct inet6_dev *idev = ctl->extra1;
5494         int min_mtu = IPV6_MIN_MTU;
5495         struct ctl_table lctl;
5496 
5497         lctl = *ctl;
5498         lctl.extra1 = &min_mtu;
5499         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5500 
5501         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5502 }
5503 
5504 static void dev_disable_change(struct inet6_dev *idev)
5505 {
5506         struct netdev_notifier_info info;
5507 
5508         if (!idev || !idev->dev)
5509                 return;
5510 
5511         netdev_notifier_info_init(&info, idev->dev);
5512         if (idev->cnf.disable_ipv6)
5513                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5514         else
5515                 addrconf_notify(NULL, NETDEV_UP, &info);
5516 }
5517 
5518 static void addrconf_disable_change(struct net *net, __s32 newf)
5519 {
5520         struct net_device *dev;
5521         struct inet6_dev *idev;
5522 
5523         rcu_read_lock();
5524         for_each_netdev_rcu(net, dev) {
5525                 idev = __in6_dev_get(dev);
5526                 if (idev) {
5527                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5528                         idev->cnf.disable_ipv6 = newf;
5529                         if (changed)
5530                                 dev_disable_change(idev);
5531                 }
5532         }
5533         rcu_read_unlock();
5534 }
5535 
5536 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5537 {
5538         struct net *net;
5539         int old;
5540 
5541         if (!rtnl_trylock())
5542                 return restart_syscall();
5543 
5544         net = (struct net *)table->extra2;
5545         old = *p;
5546         *p = newf;
5547 
5548         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5549                 rtnl_unlock();
5550                 return 0;
5551         }
5552 
5553         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5554                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5555                 addrconf_disable_change(net, newf);
5556         } else if ((!newf) ^ (!old))
5557                 dev_disable_change((struct inet6_dev *)table->extra1);
5558 
5559         rtnl_unlock();
5560         return 0;
5561 }
5562 
5563 static
5564 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5565                             void __user *buffer, size_t *lenp, loff_t *ppos)
5566 {
5567         int *valp = ctl->data;
5568         int val = *valp;
5569         loff_t pos = *ppos;
5570         struct ctl_table lctl;
5571         int ret;
5572 
5573         /*
5574          * ctl->data points to idev->cnf.disable_ipv6, we should
5575          * not modify it until we get the rtnl lock.
5576          */
5577         lctl = *ctl;
5578         lctl.data = &val;
5579 
5580         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5581 
5582         if (write)
5583                 ret = addrconf_disable_ipv6(ctl, valp, val);
5584         if (ret)
5585                 *ppos = pos;
5586         return ret;
5587 }
5588 
5589 static
5590 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5591                               void __user *buffer, size_t *lenp, loff_t *ppos)
5592 {
5593         int *valp = ctl->data;
5594         int ret;
5595         int old, new;
5596 
5597         old = *valp;
5598         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5599         new = *valp;
5600 
5601         if (write && old != new) {
5602                 struct net *net = ctl->extra2;
5603 
5604                 if (!rtnl_trylock())
5605                         return restart_syscall();
5606 
5607                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5608                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5609                                                      NETCONFA_IFINDEX_DEFAULT,
5610                                                      net->ipv6.devconf_dflt);
5611                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5612                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5613                                                      NETCONFA_IFINDEX_ALL,
5614                                                      net->ipv6.devconf_all);
5615                 else {
5616                         struct inet6_dev *idev = ctl->extra1;
5617 
5618                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5619                                                      idev->dev->ifindex,
5620                                                      &idev->cnf);
5621                 }
5622                 rtnl_unlock();
5623         }
5624 
5625         return ret;
5626 }
5627 
5628 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5629                                          void __user *buffer, size_t *lenp,
5630                                          loff_t *ppos)
5631 {
5632         int err;
5633         struct in6_addr addr;
5634         char str[IPV6_MAX_STRLEN];
5635         struct ctl_table lctl = *ctl;
5636         struct net *net = ctl->extra2;
5637         struct ipv6_stable_secret *secret = ctl->data;
5638 
5639         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5640                 return -EIO;
5641 
5642         lctl.maxlen = IPV6_MAX_STRLEN;
5643         lctl.data = str;
5644 
5645         if (!rtnl_trylock())
5646                 return restart_syscall();
5647 
5648         if (!write && !secret->initialized) {
5649                 err = -EIO;
5650                 goto out;
5651         }
5652 
5653         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5654         if (err >= sizeof(str)) {
5655                 err = -EIO;
5656                 goto out;
5657         }
5658 
5659         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5660         if (err || !write)
5661                 goto out;
5662 
5663         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5664                 err = -EIO;
5665                 goto out;
5666         }
5667 
5668         secret->initialized = true;
5669         secret->secret = addr;
5670 
5671         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5672                 struct net_device *dev;
5673 
5674                 for_each_netdev(net, dev) {
5675                         struct inet6_dev *idev = __in6_dev_get(dev);
5676 
5677                         if (idev) {
5678                                 idev->addr_gen_mode =
5679                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5680                         }
5681                 }
5682         } else {
5683                 struct inet6_dev *idev = ctl->extra1;
5684 
5685                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5686         }
5687 
5688 out:
5689         rtnl_unlock();
5690 
5691         return err;
5692 }
5693 
5694 static
5695 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5696                                                 int write,
5697                                                 void __user *buffer,
5698                                                 size_t *lenp,
5699                                                 loff_t *ppos)
5700 {
5701         int *valp = ctl->data;
5702         int val = *valp;
5703         loff_t pos = *ppos;
5704         struct ctl_table lctl;
5705         int ret;
5706 
5707         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5708          * we should not modify it until we get the rtnl lock.
5709          */
5710         lctl = *ctl;
5711         lctl.data = &val;
5712 
5713         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5714 
5715         if (write)
5716                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5717         if (ret)
5718                 *ppos = pos;
5719         return ret;
5720 }
5721 
5722 static const struct ctl_table addrconf_sysctl[] = {
5723         {
5724                 .procname       = "forwarding",
5725                 .data           = &ipv6_devconf.forwarding,
5726                 .maxlen         = sizeof(int),
5727                 .mode           = 0644,
5728                 .proc_handler   = addrconf_sysctl_forward,
5729         },
5730         {
5731                 .procname       = "hop_limit",
5732                 .data           = &ipv6_devconf.hop_limit,
5733                 .maxlen         = sizeof(int),
5734                 .mode           = 0644,
5735                 .proc_handler   = addrconf_sysctl_hop_limit,
5736         },
5737         {
5738                 .procname       = "mtu",
5739                 .data           = &ipv6_devconf.mtu6,
5740                 .maxlen         = sizeof(int),
5741                 .mode           = 0644,
5742                 .proc_handler   = addrconf_sysctl_mtu,
5743         },
5744         {
5745                 .procname       = "accept_ra",
5746                 .data           = &ipv6_devconf.accept_ra,
5747                 .maxlen         = sizeof(int),
5748                 .mode           = 0644,
5749                 .proc_handler   = proc_dointvec,
5750         },
5751         {
5752                 .procname       = "accept_redirects",
5753                 .data           = &ipv6_devconf.accept_redirects,
5754                 .maxlen         = sizeof(int),
5755                 .mode           = 0644,
5756                 .proc_handler   = proc_dointvec,
5757         },
5758         {
5759                 .procname       = "autoconf",
5760                 .data           = &ipv6_devconf.autoconf,
5761                 .maxlen         = sizeof(int),
5762                 .mode           = 0644,
5763                 .proc_handler   = proc_dointvec,
5764         },
5765         {
5766                 .procname       = "dad_transmits",
5767                 .data           = &ipv6_devconf.dad_transmits,
5768                 .maxlen         = sizeof(int),
5769                 .mode           = 0644,
5770                 .proc_handler   = proc_dointvec,
5771         },
5772         {
5773                 .procname       = "router_solicitations",
5774                 .data           = &ipv6_devconf.rtr_solicits,
5775                 .maxlen         = sizeof(int),
5776                 .mode           = 0644,
5777                 .proc_handler   = proc_dointvec,
5778         },
5779         {
5780                 .procname       = "router_solicitation_interval",
5781                 .data           = &ipv6_devconf.rtr_solicit_interval,
5782                 .maxlen         = sizeof(int),
5783                 .mode           = 0644,
5784                 .proc_handler   = proc_dointvec_jiffies,
5785         },
5786         {
5787                 .procname       = "router_solicitation_delay",
5788                 .data           = &ipv6_devconf.rtr_solicit_delay,
5789                 .maxlen         = sizeof(int),
5790                 .mode           = 0644,
5791                 .proc_handler   = proc_dointvec_jiffies,
5792         },
5793         {
5794                 .procname       = "force_mld_version",
5795                 .data           = &ipv6_devconf.force_mld_version,
5796                 .maxlen         = sizeof(int),
5797                 .mode           = 0644,
5798                 .proc_handler   = proc_dointvec,
5799         },
5800         {
5801                 .procname       = "mldv1_unsolicited_report_interval",
5802                 .data           =
5803                         &ipv6_devconf.mldv1_unsolicited_report_interval,
5804                 .maxlen         = sizeof(int),
5805                 .mode           = 0644,
5806                 .proc_handler   = proc_dointvec_ms_jiffies,
5807         },
5808         {
5809                 .procname       = "mldv2_unsolicited_report_interval",
5810                 .data           =
5811                         &ipv6_devconf.mldv2_unsolicited_report_interval,
5812                 .maxlen         = sizeof(int),
5813                 .mode           = 0644,
5814                 .proc_handler   = proc_dointvec_ms_jiffies,
5815         },
5816         {
5817                 .procname       = "use_tempaddr",
5818                 .data           = &ipv6_devconf.use_tempaddr,
5819                 .maxlen         = sizeof(int),
5820                 .mode           = 0644,
5821                 .proc_handler   = proc_dointvec,
5822         },
5823         {
5824                 .procname       = "temp_valid_lft",
5825                 .data           = &ipv6_devconf.temp_valid_lft,
5826                 .maxlen         = sizeof(int),
5827                 .mode           = 0644,
5828                 .proc_handler   = proc_dointvec,
5829         },
5830         {
5831                 .procname       = "temp_prefered_lft",
5832                 .data           = &ipv6_devconf.temp_prefered_lft,
5833                 .maxlen         = sizeof(int),
5834                 .mode           = 0644,
5835                 .proc_handler   = proc_dointvec,
5836         },
5837         {
5838                 .procname       = "regen_max_retry",
5839                 .data           = &ipv6_devconf.regen_max_retry,
5840                 .maxlen         = sizeof(int),
5841                 .mode           = 0644,
5842                 .proc_handler   = proc_dointvec,
5843         },
5844         {
5845                 .procname       = "max_desync_factor",
5846                 .data           = &ipv6_devconf.max_desync_factor,
5847                 .maxlen         = sizeof(int),
5848                 .mode           = 0644,
5849                 .proc_handler   = proc_dointvec,
5850         },
5851         {
5852                 .procname       = "max_addresses",
5853                 .data           = &ipv6_devconf.max_addresses,
5854                 .maxlen         = sizeof(int),
5855                 .mode           = 0644,
5856                 .proc_handler   = proc_dointvec,
5857         },
5858         {
5859                 .procname       = "accept_ra_defrtr",
5860                 .data           = &ipv6_devconf.accept_ra_defrtr,
5861                 .maxlen         = sizeof(int),
5862                 .mode           = 0644,
5863                 .proc_handler   = proc_dointvec,
5864         },
5865         {
5866                 .procname       = "accept_ra_min_hop_limit",
5867                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5868                 .maxlen         = sizeof(int),
5869                 .mode           = 0644,
5870                 .proc_handler   = proc_dointvec,
5871         },
5872         {
5873                 .procname       = "accept_ra_pinfo",
5874                 .data           = &ipv6_devconf.accept_ra_pinfo,
5875                 .maxlen         = sizeof(int),
5876                 .mode           = 0644,
5877                 .proc_handler   = proc_dointvec,
5878         },
5879 #ifdef CONFIG_IPV6_ROUTER_PREF
5880         {
5881                 .procname       = "accept_ra_rtr_pref",
5882                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
5883                 .maxlen         = sizeof(int),
5884                 .mode           = 0644,
5885                 .proc_handler   = proc_dointvec,
5886         },
5887         {
5888                 .procname       = "router_probe_interval",
5889                 .data           = &ipv6_devconf.rtr_probe_interval,
5890                 .maxlen         = sizeof(int),
5891                 .mode           = 0644,
5892                 .proc_handler   = proc_dointvec_jiffies,
5893         },
5894 #ifdef CONFIG_IPV6_ROUTE_INFO
5895         {
5896                 .procname       = "accept_ra_rt_info_max_plen",
5897                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5898                 .maxlen         = sizeof(int),
5899                 .mode           = 0644,
5900                 .proc_handler   = proc_dointvec,
5901         },
5902 #endif
5903 #endif
5904         {
5905                 .procname       = "proxy_ndp",
5906                 .data           = &ipv6_devconf.proxy_ndp,
5907                 .maxlen         = sizeof(int),
5908                 .mode           = 0644,
5909                 .proc_handler   = addrconf_sysctl_proxy_ndp,
5910         },
5911         {
5912                 .procname       = "accept_source_route",
5913                 .data           = &ipv6_devconf.accept_source_route,
5914                 .maxlen         = sizeof(int),
5915                 .mode           = 0644,
5916                 .proc_handler   = proc_dointvec,
5917         },
5918 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5919         {
5920                 .procname       = "optimistic_dad",
5921                 .data           = &ipv6_devconf.optimistic_dad,
5922                 .maxlen         = sizeof(int),
5923                 .mode           = 0644,
5924                 .proc_handler   = proc_dointvec,
5925         },
5926         {
5927                 .procname       = "use_optimistic",
5928                 .data           = &ipv6_devconf.use_optimistic,
5929                 .maxlen         = sizeof(int),
5930                 .mode           = 0644,
5931                 .proc_handler   = proc_dointvec,
5932         },
5933 #endif
5934 #ifdef CONFIG_IPV6_MROUTE
5935         {
5936                 .procname       = "mc_forwarding",
5937                 .data           = &ipv6_devconf.mc_forwarding,
5938                 .maxlen         = sizeof(int),
5939                 .mode           = 0444,
5940                 .proc_handler   = proc_dointvec,
5941         },
5942 #endif
5943         {
5944                 .procname       = "disable_ipv6",
5945                 .data           = &ipv6_devconf.disable_ipv6,
5946                 .maxlen         = sizeof(int),
5947                 .mode           = 0644,
5948                 .proc_handler   = addrconf_sysctl_disable,
5949         },
5950         {
5951                 .procname       = "accept_dad",
5952                 .data           = &ipv6_devconf.accept_dad,
5953                 .maxlen         = sizeof(int),
5954                 .mode           = 0644,
5955                 .proc_handler   = proc_dointvec,
5956         },
5957         {
5958                 .procname       = "force_tllao",
5959                 .data           = &ipv6_devconf.force_tllao,
5960                 .maxlen         = sizeof(int),
5961                 .mode           = 0644,
5962                 .proc_handler   = proc_dointvec
5963         },
5964         {
5965                 .procname       = "ndisc_notify",
5966                 .data           = &ipv6_devconf.ndisc_notify,
5967                 .maxlen         = sizeof(int),
5968                 .mode           = 0644,
5969                 .proc_handler   = proc_dointvec
5970         },
5971         {
5972                 .procname       = "suppress_frag_ndisc",
5973                 .data           = &ipv6_devconf.suppress_frag_ndisc,
5974                 .maxlen         = sizeof(int),
5975                 .mode           = 0644,
5976                 .proc_handler   = proc_dointvec
5977         },
5978         {
5979                 .procname       = "accept_ra_from_local",
5980                 .data           = &ipv6_devconf.accept_ra_from_local,
5981                 .maxlen         = sizeof(int),
5982                 .mode           = 0644,
5983                 .proc_handler   = proc_dointvec,
5984         },
5985         {
5986                 .procname       = "accept_ra_mtu",
5987                 .data           = &ipv6_devconf.accept_ra_mtu,
5988                 .maxlen         = sizeof(int),
5989                 .mode           = 0644,
5990                 .proc_handler   = proc_dointvec,
5991         },
5992         {
5993                 .procname       = "stable_secret",
5994                 .data           = &ipv6_devconf.stable_secret,
5995                 .maxlen         = IPV6_MAX_STRLEN,
5996                 .mode           = 0600,
5997                 .proc_handler   = addrconf_sysctl_stable_secret,
5998         },
5999         {
6000                 .procname       = "use_oif_addrs_only",
6001                 .data           = &ipv6_devconf.use_oif_addrs_only,
6002                 .maxlen         = sizeof(int),
6003                 .mode           = 0644,
6004                 .proc_handler   = proc_dointvec,
6005         },
6006         {
6007                 .procname       = "ignore_routes_with_linkdown",
6008                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6009                 .maxlen         = sizeof(int),
6010                 .mode           = 0644,
6011                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6012         },
6013         {
6014                 .procname       = "drop_unicast_in_l2_multicast",
6015                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6016                 .maxlen         = sizeof(int),
6017                 .mode           = 0644,
6018                 .proc_handler   = proc_dointvec,
6019         },
6020         {
6021                 .procname       = "drop_unsolicited_na",
6022                 .data           = &ipv6_devconf.drop_unsolicited_na,
6023                 .maxlen         = sizeof(int),
6024                 .mode           = 0644,
6025                 .proc_handler   = proc_dointvec,
6026         },
6027         {
6028                 .procname       = "keep_addr_on_down",
6029                 .data           = &ipv6_devconf.keep_addr_on_down,
6030                 .maxlen         = sizeof(int),
6031                 .mode           = 0644,
6032                 .proc_handler   = proc_dointvec,
6033 
6034         },
6035         {
6036                 /* sentinel */
6037         }
6038 };
6039 
6040 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6041                 struct inet6_dev *idev, struct ipv6_devconf *p)
6042 {
6043         int i, ifindex;
6044         struct ctl_table *table;
6045         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6046 
6047         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6048         if (!table)
6049                 goto out;
6050 
6051         for (i = 0; table[i].data; i++) {
6052                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6053                 table[i].extra1 = idev; /* embedded; no ref */
6054                 table[i].extra2 = net;
6055         }
6056 
6057         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6058 
6059         p->sysctl_header = register_net_sysctl(net, path, table);
6060         if (!p->sysctl_header)
6061                 goto free;
6062 
6063         if (!strcmp(dev_name, "all"))
6064                 ifindex = NETCONFA_IFINDEX_ALL;
6065         else if (!strcmp(dev_name, "default"))
6066                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6067         else
6068                 ifindex = idev->dev->ifindex;
6069         inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
6070         return 0;
6071 
6072 free:
6073         kfree(table);
6074 out:
6075         return -ENOBUFS;
6076 }
6077 
6078 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6079 {
6080         struct ctl_table *table;
6081 
6082         if (!p->sysctl_header)
6083                 return;
6084 
6085         table = p->sysctl_header->ctl_table_arg;
6086         unregister_net_sysctl_table(p->sysctl_header);
6087         p->sysctl_header = NULL;
6088         kfree(table);
6089 }
6090 
6091 static int addrconf_sysctl_register(struct inet6_dev *idev)
6092 {
6093         int err;
6094 
6095         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6096                 return -EINVAL;
6097 
6098         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6099                                     &ndisc_ifinfo_sysctl_change);
6100         if (err)
6101                 return err;
6102         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6103                                          idev, &idev->cnf);
6104         if (err)
6105                 neigh_sysctl_unregister(idev->nd_parms);
6106 
6107         return err;
6108 }
6109 
6110 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6111 {
6112         __addrconf_sysctl_unregister(&idev->cnf);
6113         neigh_sysctl_unregister(idev->nd_parms);
6114 }
6115 
6116 
6117 #endif
6118 
6119 static int __net_init addrconf_init_net(struct net *net)
6120 {
6121         int err = -ENOMEM;
6122         struct ipv6_devconf *all, *dflt;
6123 
6124         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6125         if (!all)
6126                 goto err_alloc_all;
6127 
6128         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6129         if (!dflt)
6130                 goto err_alloc_dflt;
6131 
6132         /* these will be inherited by all namespaces */
6133         dflt->autoconf = ipv6_defaults.autoconf;
6134         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6135 
6136         dflt->stable_secret.initialized = false;
6137         all->stable_secret.initialized = false;
6138 
6139         net->ipv6.devconf_all = all;
6140         net->ipv6.devconf_dflt = dflt;
6141 
6142 #ifdef CONFIG_SYSCTL
6143         err = __addrconf_sysctl_register(net, "all", NULL, all);
6144         if (err < 0)
6145                 goto err_reg_all;
6146 
6147         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6148         if (err < 0)
6149                 goto err_reg_dflt;
6150 #endif
6151         return 0;
6152 
6153 #ifdef CONFIG_SYSCTL
6154 err_reg_dflt:
6155         __addrconf_sysctl_unregister(all);
6156 err_reg_all:
6157         kfree(dflt);
6158 #endif
6159 err_alloc_dflt:
6160         kfree(all);
6161 err_alloc_all:
6162         return err;
6163 }
6164 
6165 static void __net_exit addrconf_exit_net(struct net *net)
6166 {
6167 #ifdef CONFIG_SYSCTL
6168         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6169         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6170 #endif
6171         kfree(net->ipv6.devconf_dflt);
6172         kfree(net->ipv6.devconf_all);
6173 }
6174 
6175 static struct pernet_operations addrconf_ops = {
6176         .init = addrconf_init_net,
6177         .exit = addrconf_exit_net,
6178 };
6179 
6180 static struct rtnl_af_ops inet6_ops __read_mostly = {
6181         .family           = AF_INET6,
6182         .fill_link_af     = inet6_fill_link_af,
6183         .get_link_af_size = inet6_get_link_af_size,
6184         .validate_link_af = inet6_validate_link_af,
6185         .set_link_af      = inet6_set_link_af,
6186 };
6187 
6188 /*
6189  *      Init / cleanup code
6190  */
6191 
6192 int __init addrconf_init(void)
6193 {
6194         struct inet6_dev *idev;
6195         int i, err;
6196 
6197         err = ipv6_addr_label_init();
6198         if (err < 0) {
6199                 pr_crit("%s: cannot initialize default policy table: %d\n",
6200                         __func__, err);
6201                 goto out;
6202         }
6203 
6204         err = register_pernet_subsys(&addrconf_ops);
6205         if (err < 0)
6206                 goto out_addrlabel;
6207 
6208         addrconf_wq = create_workqueue("ipv6_addrconf");
6209         if (!addrconf_wq) {
6210                 err = -ENOMEM;
6211                 goto out_nowq;
6212         }
6213 
6214         /* The addrconf netdev notifier requires that loopback_dev
6215          * has it's ipv6 private information allocated and setup
6216          * before it can bring up and give link-local addresses
6217          * to other devices which are up.
6218          *
6219          * Unfortunately, loopback_dev is not necessarily the first
6220          * entry in the global dev_base list of net devices.  In fact,
6221          * it is likely to be the very last entry on that list.
6222          * So this causes the notifier registry below to try and
6223          * give link-local addresses to all devices besides loopback_dev
6224          * first, then loopback_dev, which cases all the non-loopback_dev
6225          * devices to fail to get a link-local address.
6226          *
6227          * So, as a temporary fix, allocate the ipv6 structure for
6228          * loopback_dev first by hand.
6229          * Longer term, all of the dependencies ipv6 has upon the loopback
6230          * device and it being up should be removed.
6231          */
6232         rtnl_lock();
6233         idev = ipv6_add_dev(init_net.loopback_dev);
6234         rtnl_unlock();
6235         if (IS_ERR(idev)) {
6236                 err = PTR_ERR(idev);
6237                 goto errlo;
6238         }
6239 
6240         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6241                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6242 
6243         register_netdevice_notifier(&ipv6_dev_notf);
6244 
6245         addrconf_verify();
6246 
6247         rtnl_af_register(&inet6_ops);
6248 
6249         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6250                               NULL);
6251         if (err < 0)
6252                 goto errout;
6253 
6254         /* Only the first call to __rtnl_register can fail */
6255         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6256         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6257         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6258                         inet6_dump_ifaddr, NULL);
6259         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6260                         inet6_dump_ifmcaddr, NULL);
6261         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6262                         inet6_dump_ifacaddr, NULL);
6263         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6264                         inet6_netconf_dump_devconf, NULL);
6265 
6266         ipv6_addr_label_rtnl_register();
6267 
6268         return 0;
6269 errout:
6270         rtnl_af_unregister(&inet6_ops);
6271         unregister_netdevice_notifier(&ipv6_dev_notf);
6272 errlo:
6273         destroy_workqueue(addrconf_wq);
6274 out_nowq:
6275         unregister_pernet_subsys(&addrconf_ops);
6276 out_addrlabel:
6277         ipv6_addr_label_cleanup();
6278 out:
6279         return err;
6280 }
6281 
6282 void addrconf_cleanup(void)
6283 {
6284         struct net_device *dev;
6285         int i;
6286 
6287         unregister_netdevice_notifier(&ipv6_dev_notf);
6288         unregister_pernet_subsys(&addrconf_ops);
6289         ipv6_addr_label_cleanup();
6290 
6291         rtnl_lock();
6292 
6293         __rtnl_af_unregister(&inet6_ops);
6294 
6295         /* clean dev list */
6296         for_each_netdev(&init_net, dev) {
6297                 if (__in6_dev_get(dev) == NULL)
6298                         continue;
6299                 addrconf_ifdown(dev, 1);
6300         }
6301         addrconf_ifdown(init_net.loopback_dev, 2);
6302 
6303         /*
6304          *      Check hash table.
6305          */
6306         spin_lock_bh(&addrconf_hash_lock);
6307         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6308                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6309         spin_unlock_bh(&addrconf_hash_lock);
6310         cancel_delayed_work(&addr_chk_work);
6311         rtnl_unlock();
6312 
6313         destroy_workqueue(addrconf_wq);
6314 }
6315 

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