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

Version: ~ [ linux-5.12-rc7 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ 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 ] ~
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  1 /*
  2  *      IPv6 Address [auto]configuration
  3  *      Linux INET6 implementation
  4  *
  5  *      Authors:
  6  *      Pedro Roque             <roque@di.fc.ul.pt>
  7  *      Alexey Kuznetsov        <kuznet@ms2.inr.ac.ru>
  8  *
  9  *      This program is free software; you can redistribute it and/or
 10  *      modify it under the terms of the GNU General Public License
 11  *      as published by the Free Software Foundation; either version
 12  *      2 of the License, or (at your option) any later version.
 13  */
 14 
 15 /*
 16  *      Changes:
 17  *
 18  *      Janos Farkas                    :       delete timer on ifdown
 19  *      <chexum@bankinf.banki.hu>
 20  *      Andi Kleen                      :       kill double kfree on module
 21  *                                              unload.
 22  *      Maciej W. Rozycki               :       FDDI support
 23  *      sekiya@USAGI                    :       Don't send too many RS
 24  *                                              packets.
 25  *      yoshfuji@USAGI                  :       Fixed interval between DAD
 26  *                                              packets.
 27  *      YOSHIFUJI Hideaki @USAGI        :       improved accuracy of
 28  *                                              address validation timer.
 29  *      YOSHIFUJI Hideaki @USAGI        :       Privacy Extensions (RFC3041)
 30  *                                              support.
 31  *      Yuji SEKIYA @USAGI              :       Don't assign a same IPv6
 32  *                                              address on a same interface.
 33  *      YOSHIFUJI Hideaki @USAGI        :       ARCnet support
 34  *      YOSHIFUJI Hideaki @USAGI        :       convert /proc/net/if_inet6 to
 35  *                                              seq_file.
 36  *      YOSHIFUJI Hideaki @USAGI        :       improved source address
 37  *                                              selection; consider scope,
 38  *                                              status etc.
 39  */
 40 
 41 #define pr_fmt(fmt) "IPv6: " fmt
 42 
 43 #include <linux/errno.h>
 44 #include <linux/types.h>
 45 #include <linux/kernel.h>
 46 #include <linux/socket.h>
 47 #include <linux/sockios.h>
 48 #include <linux/net.h>
 49 #include <linux/inet.h>
 50 #include <linux/in6.h>
 51 #include <linux/netdevice.h>
 52 #include <linux/if_addr.h>
 53 #include <linux/if_arp.h>
 54 #include <linux/if_arcnet.h>
 55 #include <linux/if_infiniband.h>
 56 #include <linux/route.h>
 57 #include <linux/inetdevice.h>
 58 #include <linux/init.h>
 59 #include <linux/slab.h>
 60 #ifdef CONFIG_SYSCTL
 61 #include <linux/sysctl.h>
 62 #endif
 63 #include <linux/capability.h>
 64 #include <linux/delay.h>
 65 #include <linux/notifier.h>
 66 #include <linux/string.h>
 67 #include <linux/hash.h>
 68 
 69 #include <net/net_namespace.h>
 70 #include <net/sock.h>
 71 #include <net/snmp.h>
 72 
 73 #include <net/6lowpan.h>
 74 #include <net/firewire.h>
 75 #include <net/ipv6.h>
 76 #include <net/protocol.h>
 77 #include <net/ndisc.h>
 78 #include <net/ip6_route.h>
 79 #include <net/addrconf.h>
 80 #include <net/tcp.h>
 81 #include <net/ip.h>
 82 #include <net/netlink.h>
 83 #include <net/pkt_sched.h>
 84 #include <net/l3mdev.h>
 85 #include <linux/if_tunnel.h>
 86 #include <linux/rtnetlink.h>
 87 #include <linux/netconf.h>
 88 #include <linux/random.h>
 89 #include <linux/uaccess.h>
 90 #include <asm/unaligned.h>
 91 
 92 #include <linux/proc_fs.h>
 93 #include <linux/seq_file.h>
 94 #include <linux/export.h>
 95 
 96 /* Set to 3 to get tracing... */
 97 #define ACONF_DEBUG 2
 98 
 99 #if ACONF_DEBUG >= 3
100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
101 #else
102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
103 #endif
104 
105 #define INFINITY_LIFE_TIME      0xFFFFFFFF
106 
107 #define IPV6_MAX_STRLEN \
108         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109 
110 static inline u32 cstamp_delta(unsigned long cstamp)
111 {
112         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113 }
114 
115 #ifdef CONFIG_SYSCTL
116 static int addrconf_sysctl_register(struct inet6_dev *idev);
117 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118 #else
119 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
120 {
121         return 0;
122 }
123 
124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125 {
126 }
127 #endif
128 
129 static void __ipv6_regen_rndid(struct inet6_dev *idev);
130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
131 static void ipv6_regen_rndid(unsigned long data);
132 
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
135 static int ipv6_generate_stable_address(struct in6_addr *addr,
136                                         u8 dad_count,
137                                         const struct inet6_dev *idev);
138 
139 /*
140  *      Configured unicast address hash table
141  */
142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
143 static DEFINE_SPINLOCK(addrconf_hash_lock);
144 
145 static void addrconf_verify(void);
146 static void addrconf_verify_rtnl(void);
147 static void addrconf_verify_work(struct work_struct *);
148 
149 static struct workqueue_struct *addrconf_wq;
150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
151 
152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154 
155 static void addrconf_type_change(struct net_device *dev,
156                                  unsigned long event);
157 static int addrconf_ifdown(struct net_device *dev, int how);
158 
159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160                                                   int plen,
161                                                   const struct net_device *dev,
162                                                   u32 flags, u32 noflags);
163 
164 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
165 static void addrconf_dad_work(struct work_struct *w);
166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
167 static void addrconf_dad_run(struct inet6_dev *idev);
168 static void addrconf_rs_timer(unsigned long data);
169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171 
172 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
173                                 struct prefix_info *pinfo);
174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175                                struct net_device *dev);
176 
177 static struct ipv6_devconf ipv6_devconf __read_mostly = {
178         .forwarding             = 0,
179         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
180         .mtu6                   = IPV6_MIN_MTU,
181         .accept_ra              = 1,
182         .accept_redirects       = 1,
183         .autoconf               = 1,
184         .force_mld_version      = 0,
185         .mldv1_unsolicited_report_interval = 10 * HZ,
186         .mldv2_unsolicited_report_interval = HZ,
187         .dad_transmits          = 1,
188         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
189         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
190         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
191         .use_tempaddr           = 0,
192         .temp_valid_lft         = TEMP_VALID_LIFETIME,
193         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
194         .regen_max_retry        = REGEN_MAX_RETRY,
195         .max_desync_factor      = MAX_DESYNC_FACTOR,
196         .max_addresses          = IPV6_MAX_ADDRESSES,
197         .accept_ra_defrtr       = 1,
198         .accept_ra_from_local   = 0,
199         .accept_ra_min_hop_limit= 1,
200         .accept_ra_pinfo        = 1,
201 #ifdef CONFIG_IPV6_ROUTER_PREF
202         .accept_ra_rtr_pref     = 1,
203         .rtr_probe_interval     = 60 * HZ,
204 #ifdef CONFIG_IPV6_ROUTE_INFO
205         .accept_ra_rt_info_max_plen = 0,
206 #endif
207 #endif
208         .proxy_ndp              = 0,
209         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
210         .disable_ipv6           = 0,
211         .accept_dad             = 1,
212         .suppress_frag_ndisc    = 1,
213         .accept_ra_mtu          = 1,
214         .stable_secret          = {
215                 .initialized = false,
216         },
217         .use_oif_addrs_only     = 0,
218         .ignore_routes_with_linkdown = 0,
219         .keep_addr_on_down      = 0,
220 };
221 
222 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
223         .forwarding             = 0,
224         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
225         .mtu6                   = IPV6_MIN_MTU,
226         .accept_ra              = 1,
227         .accept_redirects       = 1,
228         .autoconf               = 1,
229         .force_mld_version      = 0,
230         .mldv1_unsolicited_report_interval = 10 * HZ,
231         .mldv2_unsolicited_report_interval = HZ,
232         .dad_transmits          = 1,
233         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
234         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
235         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
236         .use_tempaddr           = 0,
237         .temp_valid_lft         = TEMP_VALID_LIFETIME,
238         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
239         .regen_max_retry        = REGEN_MAX_RETRY,
240         .max_desync_factor      = MAX_DESYNC_FACTOR,
241         .max_addresses          = IPV6_MAX_ADDRESSES,
242         .accept_ra_defrtr       = 1,
243         .accept_ra_from_local   = 0,
244         .accept_ra_min_hop_limit= 1,
245         .accept_ra_pinfo        = 1,
246 #ifdef CONFIG_IPV6_ROUTER_PREF
247         .accept_ra_rtr_pref     = 1,
248         .rtr_probe_interval     = 60 * HZ,
249 #ifdef CONFIG_IPV6_ROUTE_INFO
250         .accept_ra_rt_info_max_plen = 0,
251 #endif
252 #endif
253         .proxy_ndp              = 0,
254         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
255         .disable_ipv6           = 0,
256         .accept_dad             = 1,
257         .suppress_frag_ndisc    = 1,
258         .accept_ra_mtu          = 1,
259         .stable_secret          = {
260                 .initialized = false,
261         },
262         .use_oif_addrs_only     = 0,
263         .ignore_routes_with_linkdown = 0,
264         .keep_addr_on_down      = 0,
265 };
266 
267 /* Check if a valid qdisc is available */
268 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
269 {
270         return !qdisc_tx_is_noop(dev);
271 }
272 
273 static void addrconf_del_rs_timer(struct inet6_dev *idev)
274 {
275         if (del_timer(&idev->rs_timer))
276                 __in6_dev_put(idev);
277 }
278 
279 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
280 {
281         if (cancel_delayed_work(&ifp->dad_work))
282                 __in6_ifa_put(ifp);
283 }
284 
285 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
286                                   unsigned long when)
287 {
288         if (!timer_pending(&idev->rs_timer))
289                 in6_dev_hold(idev);
290         mod_timer(&idev->rs_timer, jiffies + when);
291 }
292 
293 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
294                                    unsigned long delay)
295 {
296         if (!delayed_work_pending(&ifp->dad_work))
297                 in6_ifa_hold(ifp);
298         mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
299 }
300 
301 static int snmp6_alloc_dev(struct inet6_dev *idev)
302 {
303         int i;
304 
305         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
306         if (!idev->stats.ipv6)
307                 goto err_ip;
308 
309         for_each_possible_cpu(i) {
310                 struct ipstats_mib *addrconf_stats;
311                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
312                 u64_stats_init(&addrconf_stats->syncp);
313         }
314 
315 
316         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
317                                         GFP_KERNEL);
318         if (!idev->stats.icmpv6dev)
319                 goto err_icmp;
320         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
321                                            GFP_KERNEL);
322         if (!idev->stats.icmpv6msgdev)
323                 goto err_icmpmsg;
324 
325         return 0;
326 
327 err_icmpmsg:
328         kfree(idev->stats.icmpv6dev);
329 err_icmp:
330         free_percpu(idev->stats.ipv6);
331 err_ip:
332         return -ENOMEM;
333 }
334 
335 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
336 {
337         struct inet6_dev *ndev;
338         int err = -ENOMEM;
339 
340         ASSERT_RTNL();
341 
342         if (dev->mtu < IPV6_MIN_MTU)
343                 return ERR_PTR(-EINVAL);
344 
345         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
346         if (!ndev)
347                 return ERR_PTR(err);
348 
349         rwlock_init(&ndev->lock);
350         ndev->dev = dev;
351         INIT_LIST_HEAD(&ndev->addr_list);
352         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
353                     (unsigned long)ndev);
354         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
355 
356         if (ndev->cnf.stable_secret.initialized)
357                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
358         else
359                 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
360 
361         ndev->cnf.mtu6 = dev->mtu;
362         ndev->cnf.sysctl = NULL;
363         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
364         if (!ndev->nd_parms) {
365                 kfree(ndev);
366                 return ERR_PTR(err);
367         }
368         if (ndev->cnf.forwarding)
369                 dev_disable_lro(dev);
370         /* We refer to the device */
371         dev_hold(dev);
372 
373         if (snmp6_alloc_dev(ndev) < 0) {
374                 ADBG(KERN_WARNING
375                         "%s: cannot allocate memory for statistics; dev=%s.\n",
376                         __func__, dev->name);
377                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
378                 dev_put(dev);
379                 kfree(ndev);
380                 return ERR_PTR(err);
381         }
382 
383         if (snmp6_register_dev(ndev) < 0) {
384                 ADBG(KERN_WARNING
385                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
386                         __func__, dev->name);
387                 goto err_release;
388         }
389 
390         /* One reference from device.  We must do this before
391          * we invoke __ipv6_regen_rndid().
392          */
393         in6_dev_hold(ndev);
394 
395         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
396                 ndev->cnf.accept_dad = -1;
397 
398 #if IS_ENABLED(CONFIG_IPV6_SIT)
399         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
400                 pr_info("%s: Disabled Multicast RS\n", dev->name);
401                 ndev->cnf.rtr_solicits = 0;
402         }
403 #endif
404 
405         INIT_LIST_HEAD(&ndev->tempaddr_list);
406         setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
407         if ((dev->flags&IFF_LOOPBACK) ||
408             dev->type == ARPHRD_TUNNEL ||
409             dev->type == ARPHRD_TUNNEL6 ||
410             dev->type == ARPHRD_SIT ||
411             dev->type == ARPHRD_NONE) {
412                 ndev->cnf.use_tempaddr = -1;
413         } else {
414                 in6_dev_hold(ndev);
415                 ipv6_regen_rndid((unsigned long) ndev);
416         }
417 
418         ndev->token = in6addr_any;
419 
420         if (netif_running(dev) && addrconf_qdisc_ok(dev))
421                 ndev->if_flags |= IF_READY;
422 
423         ipv6_mc_init_dev(ndev);
424         ndev->tstamp = jiffies;
425         err = addrconf_sysctl_register(ndev);
426         if (err) {
427                 ipv6_mc_destroy_dev(ndev);
428                 del_timer(&ndev->regen_timer);
429                 snmp6_unregister_dev(ndev);
430                 goto err_release;
431         }
432         /* protected by rtnl_lock */
433         rcu_assign_pointer(dev->ip6_ptr, ndev);
434 
435         /* Join interface-local all-node multicast group */
436         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
437 
438         /* Join all-node multicast group */
439         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
440 
441         /* Join all-router multicast group if forwarding is set */
442         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
443                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
444 
445         return ndev;
446 
447 err_release:
448         neigh_parms_release(&nd_tbl, ndev->nd_parms);
449         ndev->dead = 1;
450         in6_dev_finish_destroy(ndev);
451         return ERR_PTR(err);
452 }
453 
454 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
455 {
456         struct inet6_dev *idev;
457 
458         ASSERT_RTNL();
459 
460         idev = __in6_dev_get(dev);
461         if (!idev) {
462                 idev = ipv6_add_dev(dev);
463                 if (IS_ERR(idev))
464                         return NULL;
465         }
466 
467         if (dev->flags&IFF_UP)
468                 ipv6_mc_up(idev);
469         return idev;
470 }
471 
472 static int inet6_netconf_msgsize_devconf(int type)
473 {
474         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
475                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
476         bool all = false;
477 
478         if (type == NETCONFA_ALL)
479                 all = true;
480 
481         if (all || type == NETCONFA_FORWARDING)
482                 size += nla_total_size(4);
483 #ifdef CONFIG_IPV6_MROUTE
484         if (all || type == NETCONFA_MC_FORWARDING)
485                 size += nla_total_size(4);
486 #endif
487         if (all || type == NETCONFA_PROXY_NEIGH)
488                 size += nla_total_size(4);
489 
490         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
491                 size += nla_total_size(4);
492 
493         return size;
494 }
495 
496 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
497                                       struct ipv6_devconf *devconf, u32 portid,
498                                       u32 seq, int event, unsigned int flags,
499                                       int type)
500 {
501         struct nlmsghdr  *nlh;
502         struct netconfmsg *ncm;
503         bool all = false;
504 
505         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
506                         flags);
507         if (!nlh)
508                 return -EMSGSIZE;
509 
510         if (type == NETCONFA_ALL)
511                 all = true;
512 
513         ncm = nlmsg_data(nlh);
514         ncm->ncm_family = AF_INET6;
515 
516         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
517                 goto nla_put_failure;
518 
519         if ((all || type == NETCONFA_FORWARDING) &&
520             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
521                 goto nla_put_failure;
522 #ifdef CONFIG_IPV6_MROUTE
523         if ((all || type == NETCONFA_MC_FORWARDING) &&
524             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
525                         devconf->mc_forwarding) < 0)
526                 goto nla_put_failure;
527 #endif
528         if ((all || type == NETCONFA_PROXY_NEIGH) &&
529             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
530                 goto nla_put_failure;
531 
532         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
533             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
534                         devconf->ignore_routes_with_linkdown) < 0)
535                 goto nla_put_failure;
536 
537         nlmsg_end(skb, nlh);
538         return 0;
539 
540 nla_put_failure:
541         nlmsg_cancel(skb, nlh);
542         return -EMSGSIZE;
543 }
544 
545 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
546                                   struct ipv6_devconf *devconf)
547 {
548         struct sk_buff *skb;
549         int err = -ENOBUFS;
550 
551         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
552         if (!skb)
553                 goto errout;
554 
555         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
556                                          RTM_NEWNETCONF, 0, type);
557         if (err < 0) {
558                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
559                 WARN_ON(err == -EMSGSIZE);
560                 kfree_skb(skb);
561                 goto errout;
562         }
563         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
564         return;
565 errout:
566         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
567 }
568 
569 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
570         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
571         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
572         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
573         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
574 };
575 
576 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
577                                      struct nlmsghdr *nlh)
578 {
579         struct net *net = sock_net(in_skb->sk);
580         struct nlattr *tb[NETCONFA_MAX+1];
581         struct netconfmsg *ncm;
582         struct sk_buff *skb;
583         struct ipv6_devconf *devconf;
584         struct inet6_dev *in6_dev;
585         struct net_device *dev;
586         int ifindex;
587         int err;
588 
589         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
590                           devconf_ipv6_policy);
591         if (err < 0)
592                 goto errout;
593 
594         err = -EINVAL;
595         if (!tb[NETCONFA_IFINDEX])
596                 goto errout;
597 
598         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
599         switch (ifindex) {
600         case NETCONFA_IFINDEX_ALL:
601                 devconf = net->ipv6.devconf_all;
602                 break;
603         case NETCONFA_IFINDEX_DEFAULT:
604                 devconf = net->ipv6.devconf_dflt;
605                 break;
606         default:
607                 dev = __dev_get_by_index(net, ifindex);
608                 if (!dev)
609                         goto errout;
610                 in6_dev = __in6_dev_get(dev);
611                 if (!in6_dev)
612                         goto errout;
613                 devconf = &in6_dev->cnf;
614                 break;
615         }
616 
617         err = -ENOBUFS;
618         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
619         if (!skb)
620                 goto errout;
621 
622         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
623                                          NETLINK_CB(in_skb).portid,
624                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
625                                          NETCONFA_ALL);
626         if (err < 0) {
627                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
628                 WARN_ON(err == -EMSGSIZE);
629                 kfree_skb(skb);
630                 goto errout;
631         }
632         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
633 errout:
634         return err;
635 }
636 
637 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
638                                       struct netlink_callback *cb)
639 {
640         struct net *net = sock_net(skb->sk);
641         int h, s_h;
642         int idx, s_idx;
643         struct net_device *dev;
644         struct inet6_dev *idev;
645         struct hlist_head *head;
646 
647         s_h = cb->args[0];
648         s_idx = idx = cb->args[1];
649 
650         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
651                 idx = 0;
652                 head = &net->dev_index_head[h];
653                 rcu_read_lock();
654                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
655                           net->dev_base_seq;
656                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
657                         if (idx < s_idx)
658                                 goto cont;
659                         idev = __in6_dev_get(dev);
660                         if (!idev)
661                                 goto cont;
662 
663                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
664                                                        &idev->cnf,
665                                                        NETLINK_CB(cb->skb).portid,
666                                                        cb->nlh->nlmsg_seq,
667                                                        RTM_NEWNETCONF,
668                                                        NLM_F_MULTI,
669                                                        NETCONFA_ALL) < 0) {
670                                 rcu_read_unlock();
671                                 goto done;
672                         }
673                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
674 cont:
675                         idx++;
676                 }
677                 rcu_read_unlock();
678         }
679         if (h == NETDEV_HASHENTRIES) {
680                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
681                                                net->ipv6.devconf_all,
682                                                NETLINK_CB(cb->skb).portid,
683                                                cb->nlh->nlmsg_seq,
684                                                RTM_NEWNETCONF, NLM_F_MULTI,
685                                                NETCONFA_ALL) < 0)
686                         goto done;
687                 else
688                         h++;
689         }
690         if (h == NETDEV_HASHENTRIES + 1) {
691                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
692                                                net->ipv6.devconf_dflt,
693                                                NETLINK_CB(cb->skb).portid,
694                                                cb->nlh->nlmsg_seq,
695                                                RTM_NEWNETCONF, NLM_F_MULTI,
696                                                NETCONFA_ALL) < 0)
697                         goto done;
698                 else
699                         h++;
700         }
701 done:
702         cb->args[0] = h;
703         cb->args[1] = idx;
704 
705         return skb->len;
706 }
707 
708 #ifdef CONFIG_SYSCTL
709 static void dev_forward_change(struct inet6_dev *idev)
710 {
711         struct net_device *dev;
712         struct inet6_ifaddr *ifa;
713 
714         if (!idev)
715                 return;
716         dev = idev->dev;
717         if (idev->cnf.forwarding)
718                 dev_disable_lro(dev);
719         if (dev->flags & IFF_MULTICAST) {
720                 if (idev->cnf.forwarding) {
721                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
722                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
723                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
724                 } else {
725                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
726                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
727                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
728                 }
729         }
730 
731         list_for_each_entry(ifa, &idev->addr_list, if_list) {
732                 if (ifa->flags&IFA_F_TENTATIVE)
733                         continue;
734                 if (idev->cnf.forwarding)
735                         addrconf_join_anycast(ifa);
736                 else
737                         addrconf_leave_anycast(ifa);
738         }
739         inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
740                                      dev->ifindex, &idev->cnf);
741 }
742 
743 
744 static void addrconf_forward_change(struct net *net, __s32 newf)
745 {
746         struct net_device *dev;
747         struct inet6_dev *idev;
748 
749         for_each_netdev(net, dev) {
750                 idev = __in6_dev_get(dev);
751                 if (idev) {
752                         int changed = (!idev->cnf.forwarding) ^ (!newf);
753                         idev->cnf.forwarding = newf;
754                         if (changed)
755                                 dev_forward_change(idev);
756                 }
757         }
758 }
759 
760 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
761 {
762         struct net *net;
763         int old;
764 
765         if (!rtnl_trylock())
766                 return restart_syscall();
767 
768         net = (struct net *)table->extra2;
769         old = *p;
770         *p = newf;
771 
772         if (p == &net->ipv6.devconf_dflt->forwarding) {
773                 if ((!newf) ^ (!old))
774                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
775                                                      NETCONFA_IFINDEX_DEFAULT,
776                                                      net->ipv6.devconf_dflt);
777                 rtnl_unlock();
778                 return 0;
779         }
780 
781         if (p == &net->ipv6.devconf_all->forwarding) {
782                 net->ipv6.devconf_dflt->forwarding = newf;
783                 addrconf_forward_change(net, newf);
784                 if ((!newf) ^ (!old))
785                         inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
786                                                      NETCONFA_IFINDEX_ALL,
787                                                      net->ipv6.devconf_all);
788         } else if ((!newf) ^ (!old))
789                 dev_forward_change((struct inet6_dev *)table->extra1);
790         rtnl_unlock();
791 
792         if (newf)
793                 rt6_purge_dflt_routers(net);
794         return 1;
795 }
796 
797 static void addrconf_linkdown_change(struct net *net, __s32 newf)
798 {
799         struct net_device *dev;
800         struct inet6_dev *idev;
801 
802         for_each_netdev(net, dev) {
803                 idev = __in6_dev_get(dev);
804                 if (idev) {
805                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
806 
807                         idev->cnf.ignore_routes_with_linkdown = newf;
808                         if (changed)
809                                 inet6_netconf_notify_devconf(dev_net(dev),
810                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
811                                                              dev->ifindex,
812                                                              &idev->cnf);
813                 }
814         }
815 }
816 
817 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
818 {
819         struct net *net;
820         int old;
821 
822         if (!rtnl_trylock())
823                 return restart_syscall();
824 
825         net = (struct net *)table->extra2;
826         old = *p;
827         *p = newf;
828 
829         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
830                 if ((!newf) ^ (!old))
831                         inet6_netconf_notify_devconf(net,
832                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
833                                                      NETCONFA_IFINDEX_DEFAULT,
834                                                      net->ipv6.devconf_dflt);
835                 rtnl_unlock();
836                 return 0;
837         }
838 
839         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
840                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
841                 addrconf_linkdown_change(net, newf);
842                 if ((!newf) ^ (!old))
843                         inet6_netconf_notify_devconf(net,
844                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
845                                                      NETCONFA_IFINDEX_ALL,
846                                                      net->ipv6.devconf_all);
847         }
848         rtnl_unlock();
849 
850         return 1;
851 }
852 
853 #endif
854 
855 /* Nobody refers to this ifaddr, destroy it */
856 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
857 {
858         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
859 
860 #ifdef NET_REFCNT_DEBUG
861         pr_debug("%s\n", __func__);
862 #endif
863 
864         in6_dev_put(ifp->idev);
865 
866         if (cancel_delayed_work(&ifp->dad_work))
867                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
868                           ifp);
869 
870         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
871                 pr_warn("Freeing alive inet6 address %p\n", ifp);
872                 return;
873         }
874         ip6_rt_put(ifp->rt);
875 
876         kfree_rcu(ifp, rcu);
877 }
878 
879 static void
880 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
881 {
882         struct list_head *p;
883         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
884 
885         /*
886          * Each device address list is sorted in order of scope -
887          * global before linklocal.
888          */
889         list_for_each(p, &idev->addr_list) {
890                 struct inet6_ifaddr *ifa
891                         = list_entry(p, struct inet6_ifaddr, if_list);
892                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
893                         break;
894         }
895 
896         list_add_tail(&ifp->if_list, p);
897 }
898 
899 static u32 inet6_addr_hash(const struct in6_addr *addr)
900 {
901         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
902 }
903 
904 /* On success it returns ifp with increased reference count */
905 
906 static struct inet6_ifaddr *
907 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
908               const struct in6_addr *peer_addr, int pfxlen,
909               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
910 {
911         struct inet6_ifaddr *ifa = NULL;
912         struct rt6_info *rt;
913         unsigned int hash;
914         int err = 0;
915         int addr_type = ipv6_addr_type(addr);
916 
917         if (addr_type == IPV6_ADDR_ANY ||
918             addr_type & IPV6_ADDR_MULTICAST ||
919             (!(idev->dev->flags & IFF_LOOPBACK) &&
920              addr_type & IPV6_ADDR_LOOPBACK))
921                 return ERR_PTR(-EADDRNOTAVAIL);
922 
923         rcu_read_lock_bh();
924         if (idev->dead) {
925                 err = -ENODEV;                  /*XXX*/
926                 goto out2;
927         }
928 
929         if (idev->cnf.disable_ipv6) {
930                 err = -EACCES;
931                 goto out2;
932         }
933 
934         spin_lock(&addrconf_hash_lock);
935 
936         /* Ignore adding duplicate addresses on an interface */
937         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
938                 ADBG("ipv6_add_addr: already assigned\n");
939                 err = -EEXIST;
940                 goto out;
941         }
942 
943         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
944 
945         if (!ifa) {
946                 ADBG("ipv6_add_addr: malloc failed\n");
947                 err = -ENOBUFS;
948                 goto out;
949         }
950 
951         rt = addrconf_dst_alloc(idev, addr, false);
952         if (IS_ERR(rt)) {
953                 err = PTR_ERR(rt);
954                 goto out;
955         }
956 
957         neigh_parms_data_state_setall(idev->nd_parms);
958 
959         ifa->addr = *addr;
960         if (peer_addr)
961                 ifa->peer_addr = *peer_addr;
962 
963         spin_lock_init(&ifa->lock);
964         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
965         INIT_HLIST_NODE(&ifa->addr_lst);
966         ifa->scope = scope;
967         ifa->prefix_len = pfxlen;
968         ifa->flags = flags | IFA_F_TENTATIVE;
969         ifa->valid_lft = valid_lft;
970         ifa->prefered_lft = prefered_lft;
971         ifa->cstamp = ifa->tstamp = jiffies;
972         ifa->tokenized = false;
973 
974         ifa->rt = rt;
975 
976         ifa->idev = idev;
977         in6_dev_hold(idev);
978         /* For caller */
979         in6_ifa_hold(ifa);
980 
981         /* Add to big hash table */
982         hash = inet6_addr_hash(addr);
983 
984         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
985         spin_unlock(&addrconf_hash_lock);
986 
987         write_lock(&idev->lock);
988         /* Add to inet6_dev unicast addr list. */
989         ipv6_link_dev_addr(idev, ifa);
990 
991         if (ifa->flags&IFA_F_TEMPORARY) {
992                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
993                 in6_ifa_hold(ifa);
994         }
995 
996         in6_ifa_hold(ifa);
997         write_unlock(&idev->lock);
998 out2:
999         rcu_read_unlock_bh();
1000 
1001         if (likely(err == 0))
1002                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1003         else {
1004                 kfree(ifa);
1005                 ifa = ERR_PTR(err);
1006         }
1007 
1008         return ifa;
1009 out:
1010         spin_unlock(&addrconf_hash_lock);
1011         goto out2;
1012 }
1013 
1014 enum cleanup_prefix_rt_t {
1015         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1016         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1017         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1018 };
1019 
1020 /*
1021  * Check, whether the prefix for ifp would still need a prefix route
1022  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1023  * constants.
1024  *
1025  * 1) we don't purge prefix if address was not permanent.
1026  *    prefix is managed by its own lifetime.
1027  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1028  * 3) if there are no addresses, delete prefix.
1029  * 4) if there are still other permanent address(es),
1030  *    corresponding prefix is still permanent.
1031  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1032  *    don't purge the prefix, assume user space is managing it.
1033  * 6) otherwise, update prefix lifetime to the
1034  *    longest valid lifetime among the corresponding
1035  *    addresses on the device.
1036  *    Note: subsequent RA will update lifetime.
1037  **/
1038 static enum cleanup_prefix_rt_t
1039 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1040 {
1041         struct inet6_ifaddr *ifa;
1042         struct inet6_dev *idev = ifp->idev;
1043         unsigned long lifetime;
1044         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1045 
1046         *expires = jiffies;
1047 
1048         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1049                 if (ifa == ifp)
1050                         continue;
1051                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1052                                        ifp->prefix_len))
1053                         continue;
1054                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1055                         return CLEANUP_PREFIX_RT_NOP;
1056 
1057                 action = CLEANUP_PREFIX_RT_EXPIRE;
1058 
1059                 spin_lock(&ifa->lock);
1060 
1061                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1062                 /*
1063                  * Note: Because this address is
1064                  * not permanent, lifetime <
1065                  * LONG_MAX / HZ here.
1066                  */
1067                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1068                         *expires = ifa->tstamp + lifetime * HZ;
1069                 spin_unlock(&ifa->lock);
1070         }
1071 
1072         return action;
1073 }
1074 
1075 static void
1076 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1077 {
1078         struct rt6_info *rt;
1079 
1080         rt = addrconf_get_prefix_route(&ifp->addr,
1081                                        ifp->prefix_len,
1082                                        ifp->idev->dev,
1083                                        0, RTF_GATEWAY | RTF_DEFAULT);
1084         if (rt) {
1085                 if (del_rt)
1086                         ip6_del_rt(rt);
1087                 else {
1088                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1089                                 rt6_set_expires(rt, expires);
1090                         ip6_rt_put(rt);
1091                 }
1092         }
1093 }
1094 
1095 
1096 /* This function wants to get referenced ifp and releases it before return */
1097 
1098 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1099 {
1100         int state;
1101         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1102         unsigned long expires;
1103 
1104         ASSERT_RTNL();
1105 
1106         spin_lock_bh(&ifp->lock);
1107         state = ifp->state;
1108         ifp->state = INET6_IFADDR_STATE_DEAD;
1109         spin_unlock_bh(&ifp->lock);
1110 
1111         if (state == INET6_IFADDR_STATE_DEAD)
1112                 goto out;
1113 
1114         spin_lock_bh(&addrconf_hash_lock);
1115         hlist_del_init_rcu(&ifp->addr_lst);
1116         spin_unlock_bh(&addrconf_hash_lock);
1117 
1118         write_lock_bh(&ifp->idev->lock);
1119 
1120         if (ifp->flags&IFA_F_TEMPORARY) {
1121                 list_del(&ifp->tmp_list);
1122                 if (ifp->ifpub) {
1123                         in6_ifa_put(ifp->ifpub);
1124                         ifp->ifpub = NULL;
1125                 }
1126                 __in6_ifa_put(ifp);
1127         }
1128 
1129         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1130                 action = check_cleanup_prefix_route(ifp, &expires);
1131 
1132         list_del_init(&ifp->if_list);
1133         __in6_ifa_put(ifp);
1134 
1135         write_unlock_bh(&ifp->idev->lock);
1136 
1137         addrconf_del_dad_work(ifp);
1138 
1139         ipv6_ifa_notify(RTM_DELADDR, ifp);
1140 
1141         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1142 
1143         if (action != CLEANUP_PREFIX_RT_NOP) {
1144                 cleanup_prefix_route(ifp, expires,
1145                         action == CLEANUP_PREFIX_RT_DEL);
1146         }
1147 
1148         /* clean up prefsrc entries */
1149         rt6_remove_prefsrc(ifp);
1150 out:
1151         in6_ifa_put(ifp);
1152 }
1153 
1154 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1155 {
1156         struct inet6_dev *idev = ifp->idev;
1157         struct in6_addr addr, *tmpaddr;
1158         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1159         unsigned long regen_advance;
1160         int tmp_plen;
1161         int ret = 0;
1162         u32 addr_flags;
1163         unsigned long now = jiffies;
1164 
1165         write_lock_bh(&idev->lock);
1166         if (ift) {
1167                 spin_lock_bh(&ift->lock);
1168                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1169                 spin_unlock_bh(&ift->lock);
1170                 tmpaddr = &addr;
1171         } else {
1172                 tmpaddr = NULL;
1173         }
1174 retry:
1175         in6_dev_hold(idev);
1176         if (idev->cnf.use_tempaddr <= 0) {
1177                 write_unlock_bh(&idev->lock);
1178                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1179                 in6_dev_put(idev);
1180                 ret = -1;
1181                 goto out;
1182         }
1183         spin_lock_bh(&ifp->lock);
1184         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1185                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1186                 spin_unlock_bh(&ifp->lock);
1187                 write_unlock_bh(&idev->lock);
1188                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1189                         __func__);
1190                 in6_dev_put(idev);
1191                 ret = -1;
1192                 goto out;
1193         }
1194         in6_ifa_hold(ifp);
1195         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1196         __ipv6_try_regen_rndid(idev, tmpaddr);
1197         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1198         age = (now - ifp->tstamp) / HZ;
1199         tmp_valid_lft = min_t(__u32,
1200                               ifp->valid_lft,
1201                               idev->cnf.temp_valid_lft + age);
1202         tmp_prefered_lft = min_t(__u32,
1203                                  ifp->prefered_lft,
1204                                  idev->cnf.temp_prefered_lft + age -
1205                                  idev->cnf.max_desync_factor);
1206         tmp_plen = ifp->prefix_len;
1207         tmp_tstamp = ifp->tstamp;
1208         spin_unlock_bh(&ifp->lock);
1209 
1210         regen_advance = idev->cnf.regen_max_retry *
1211                         idev->cnf.dad_transmits *
1212                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1213         write_unlock_bh(&idev->lock);
1214 
1215         /* A temporary address is created only if this calculated Preferred
1216          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1217          * an implementation must not create a temporary address with a zero
1218          * Preferred Lifetime.
1219          * Use age calculation as in addrconf_verify to avoid unnecessary
1220          * temporary addresses being generated.
1221          */
1222         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1223         if (tmp_prefered_lft <= regen_advance + age) {
1224                 in6_ifa_put(ifp);
1225                 in6_dev_put(idev);
1226                 ret = -1;
1227                 goto out;
1228         }
1229 
1230         addr_flags = IFA_F_TEMPORARY;
1231         /* set in addrconf_prefix_rcv() */
1232         if (ifp->flags & IFA_F_OPTIMISTIC)
1233                 addr_flags |= IFA_F_OPTIMISTIC;
1234 
1235         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1236                             ipv6_addr_scope(&addr), addr_flags,
1237                             tmp_valid_lft, tmp_prefered_lft);
1238         if (IS_ERR(ift)) {
1239                 in6_ifa_put(ifp);
1240                 in6_dev_put(idev);
1241                 pr_info("%s: retry temporary address regeneration\n", __func__);
1242                 tmpaddr = &addr;
1243                 write_lock_bh(&idev->lock);
1244                 goto retry;
1245         }
1246 
1247         spin_lock_bh(&ift->lock);
1248         ift->ifpub = ifp;
1249         ift->cstamp = now;
1250         ift->tstamp = tmp_tstamp;
1251         spin_unlock_bh(&ift->lock);
1252 
1253         addrconf_dad_start(ift);
1254         in6_ifa_put(ift);
1255         in6_dev_put(idev);
1256 out:
1257         return ret;
1258 }
1259 
1260 /*
1261  *      Choose an appropriate source address (RFC3484)
1262  */
1263 enum {
1264         IPV6_SADDR_RULE_INIT = 0,
1265         IPV6_SADDR_RULE_LOCAL,
1266         IPV6_SADDR_RULE_SCOPE,
1267         IPV6_SADDR_RULE_PREFERRED,
1268 #ifdef CONFIG_IPV6_MIP6
1269         IPV6_SADDR_RULE_HOA,
1270 #endif
1271         IPV6_SADDR_RULE_OIF,
1272         IPV6_SADDR_RULE_LABEL,
1273         IPV6_SADDR_RULE_PRIVACY,
1274         IPV6_SADDR_RULE_ORCHID,
1275         IPV6_SADDR_RULE_PREFIX,
1276 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1277         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1278 #endif
1279         IPV6_SADDR_RULE_MAX
1280 };
1281 
1282 struct ipv6_saddr_score {
1283         int                     rule;
1284         int                     addr_type;
1285         struct inet6_ifaddr     *ifa;
1286         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1287         int                     scopedist;
1288         int                     matchlen;
1289 };
1290 
1291 struct ipv6_saddr_dst {
1292         const struct in6_addr *addr;
1293         int ifindex;
1294         int scope;
1295         int label;
1296         unsigned int prefs;
1297 };
1298 
1299 static inline int ipv6_saddr_preferred(int type)
1300 {
1301         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1302                 return 1;
1303         return 0;
1304 }
1305 
1306 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1307 {
1308 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1309         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1310 #else
1311         return false;
1312 #endif
1313 }
1314 
1315 static int ipv6_get_saddr_eval(struct net *net,
1316                                struct ipv6_saddr_score *score,
1317                                struct ipv6_saddr_dst *dst,
1318                                int i)
1319 {
1320         int ret;
1321 
1322         if (i <= score->rule) {
1323                 switch (i) {
1324                 case IPV6_SADDR_RULE_SCOPE:
1325                         ret = score->scopedist;
1326                         break;
1327                 case IPV6_SADDR_RULE_PREFIX:
1328                         ret = score->matchlen;
1329                         break;
1330                 default:
1331                         ret = !!test_bit(i, score->scorebits);
1332                 }
1333                 goto out;
1334         }
1335 
1336         switch (i) {
1337         case IPV6_SADDR_RULE_INIT:
1338                 /* Rule 0: remember if hiscore is not ready yet */
1339                 ret = !!score->ifa;
1340                 break;
1341         case IPV6_SADDR_RULE_LOCAL:
1342                 /* Rule 1: Prefer same address */
1343                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1344                 break;
1345         case IPV6_SADDR_RULE_SCOPE:
1346                 /* Rule 2: Prefer appropriate scope
1347                  *
1348                  *      ret
1349                  *       ^
1350                  *    -1 |  d 15
1351                  *    ---+--+-+---> scope
1352                  *       |
1353                  *       |             d is scope of the destination.
1354                  *  B-d  |  \
1355                  *       |   \      <- smaller scope is better if
1356                  *  B-15 |    \        if scope is enough for destination.
1357                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1358                  * d-C-1 | /
1359                  *       |/         <- greater is better
1360                  *   -C  /             if scope is not enough for destination.
1361                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1362                  *
1363                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1364                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1365                  * Assume B = 0 and we get C > 29.
1366                  */
1367                 ret = __ipv6_addr_src_scope(score->addr_type);
1368                 if (ret >= dst->scope)
1369                         ret = -ret;
1370                 else
1371                         ret -= 128;     /* 30 is enough */
1372                 score->scopedist = ret;
1373                 break;
1374         case IPV6_SADDR_RULE_PREFERRED:
1375             {
1376                 /* Rule 3: Avoid deprecated and optimistic addresses */
1377                 u8 avoid = IFA_F_DEPRECATED;
1378 
1379                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1380                         avoid |= IFA_F_OPTIMISTIC;
1381                 ret = ipv6_saddr_preferred(score->addr_type) ||
1382                       !(score->ifa->flags & avoid);
1383                 break;
1384             }
1385 #ifdef CONFIG_IPV6_MIP6
1386         case IPV6_SADDR_RULE_HOA:
1387             {
1388                 /* Rule 4: Prefer home address */
1389                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1390                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1391                 break;
1392             }
1393 #endif
1394         case IPV6_SADDR_RULE_OIF:
1395                 /* Rule 5: Prefer outgoing interface */
1396                 ret = (!dst->ifindex ||
1397                        dst->ifindex == score->ifa->idev->dev->ifindex);
1398                 break;
1399         case IPV6_SADDR_RULE_LABEL:
1400                 /* Rule 6: Prefer matching label */
1401                 ret = ipv6_addr_label(net,
1402                                       &score->ifa->addr, score->addr_type,
1403                                       score->ifa->idev->dev->ifindex) == dst->label;
1404                 break;
1405         case IPV6_SADDR_RULE_PRIVACY:
1406             {
1407                 /* Rule 7: Prefer public address
1408                  * Note: prefer temporary address if use_tempaddr >= 2
1409                  */
1410                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1411                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1412                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1413                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1414                 break;
1415             }
1416         case IPV6_SADDR_RULE_ORCHID:
1417                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1418                  *          non-ORCHID vs non-ORCHID
1419                  */
1420                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1421                         ipv6_addr_orchid(dst->addr));
1422                 break;
1423         case IPV6_SADDR_RULE_PREFIX:
1424                 /* Rule 8: Use longest matching prefix */
1425                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1426                 if (ret > score->ifa->prefix_len)
1427                         ret = score->ifa->prefix_len;
1428                 score->matchlen = ret;
1429                 break;
1430 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1431         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1432                 /* Optimistic addresses still have lower precedence than other
1433                  * preferred addresses.
1434                  */
1435                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1436                 break;
1437 #endif
1438         default:
1439                 ret = 0;
1440         }
1441 
1442         if (ret)
1443                 __set_bit(i, score->scorebits);
1444         score->rule = i;
1445 out:
1446         return ret;
1447 }
1448 
1449 static int __ipv6_dev_get_saddr(struct net *net,
1450                                 struct ipv6_saddr_dst *dst,
1451                                 struct inet6_dev *idev,
1452                                 struct ipv6_saddr_score *scores,
1453                                 int hiscore_idx)
1454 {
1455         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1456 
1457         read_lock_bh(&idev->lock);
1458         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1459                 int i;
1460 
1461                 /*
1462                  * - Tentative Address (RFC2462 section 5.4)
1463                  *  - A tentative address is not considered
1464                  *    "assigned to an interface" in the traditional
1465                  *    sense, unless it is also flagged as optimistic.
1466                  * - Candidate Source Address (section 4)
1467                  *  - In any case, anycast addresses, multicast
1468                  *    addresses, and the unspecified address MUST
1469                  *    NOT be included in a candidate set.
1470                  */
1471                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1472                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1473                         continue;
1474 
1475                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1476 
1477                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1478                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1479                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1480                                             idev->dev->name);
1481                         continue;
1482                 }
1483 
1484                 score->rule = -1;
1485                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1486 
1487                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1488                         int minihiscore, miniscore;
1489 
1490                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1491                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1492 
1493                         if (minihiscore > miniscore) {
1494                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1495                                     score->scopedist > 0) {
1496                                         /*
1497                                          * special case:
1498                                          * each remaining entry
1499                                          * has too small (not enough)
1500                                          * scope, because ifa entries
1501                                          * are sorted by their scope
1502                                          * values.
1503                                          */
1504                                         goto out;
1505                                 }
1506                                 break;
1507                         } else if (minihiscore < miniscore) {
1508                                 if (hiscore->ifa)
1509                                         in6_ifa_put(hiscore->ifa);
1510 
1511                                 in6_ifa_hold(score->ifa);
1512 
1513                                 swap(hiscore, score);
1514                                 hiscore_idx = 1 - hiscore_idx;
1515 
1516                                 /* restore our iterator */
1517                                 score->ifa = hiscore->ifa;
1518 
1519                                 break;
1520                         }
1521                 }
1522         }
1523 out:
1524         read_unlock_bh(&idev->lock);
1525         return hiscore_idx;
1526 }
1527 
1528 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1529                        const struct in6_addr *daddr, unsigned int prefs,
1530                        struct in6_addr *saddr)
1531 {
1532         struct ipv6_saddr_score scores[2], *hiscore;
1533         struct ipv6_saddr_dst dst;
1534         struct inet6_dev *idev;
1535         struct net_device *dev;
1536         int dst_type;
1537         bool use_oif_addr = false;
1538         int hiscore_idx = 0;
1539 
1540         dst_type = __ipv6_addr_type(daddr);
1541         dst.addr = daddr;
1542         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1543         dst.scope = __ipv6_addr_src_scope(dst_type);
1544         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1545         dst.prefs = prefs;
1546 
1547         scores[hiscore_idx].rule = -1;
1548         scores[hiscore_idx].ifa = NULL;
1549 
1550         rcu_read_lock();
1551 
1552         /* Candidate Source Address (section 4)
1553          *  - multicast and link-local destination address,
1554          *    the set of candidate source address MUST only
1555          *    include addresses assigned to interfaces
1556          *    belonging to the same link as the outgoing
1557          *    interface.
1558          * (- For site-local destination addresses, the
1559          *    set of candidate source addresses MUST only
1560          *    include addresses assigned to interfaces
1561          *    belonging to the same site as the outgoing
1562          *    interface.)
1563          *  - "It is RECOMMENDED that the candidate source addresses
1564          *    be the set of unicast addresses assigned to the
1565          *    interface that will be used to send to the destination
1566          *    (the 'outgoing' interface)." (RFC 6724)
1567          */
1568         if (dst_dev) {
1569                 idev = __in6_dev_get(dst_dev);
1570                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1571                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1572                     (idev && idev->cnf.use_oif_addrs_only)) {
1573                         use_oif_addr = true;
1574                 }
1575         }
1576 
1577         if (use_oif_addr) {
1578                 if (idev)
1579                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1580         } else {
1581                 for_each_netdev_rcu(net, dev) {
1582                         idev = __in6_dev_get(dev);
1583                         if (!idev)
1584                                 continue;
1585                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1586                 }
1587         }
1588         rcu_read_unlock();
1589 
1590         hiscore = &scores[hiscore_idx];
1591         if (!hiscore->ifa)
1592                 return -EADDRNOTAVAIL;
1593 
1594         *saddr = hiscore->ifa->addr;
1595         in6_ifa_put(hiscore->ifa);
1596         return 0;
1597 }
1598 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1599 
1600 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1601                       u32 banned_flags)
1602 {
1603         struct inet6_ifaddr *ifp;
1604         int err = -EADDRNOTAVAIL;
1605 
1606         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1607                 if (ifp->scope > IFA_LINK)
1608                         break;
1609                 if (ifp->scope == IFA_LINK &&
1610                     !(ifp->flags & banned_flags)) {
1611                         *addr = ifp->addr;
1612                         err = 0;
1613                         break;
1614                 }
1615         }
1616         return err;
1617 }
1618 
1619 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1620                     u32 banned_flags)
1621 {
1622         struct inet6_dev *idev;
1623         int err = -EADDRNOTAVAIL;
1624 
1625         rcu_read_lock();
1626         idev = __in6_dev_get(dev);
1627         if (idev) {
1628                 read_lock_bh(&idev->lock);
1629                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1630                 read_unlock_bh(&idev->lock);
1631         }
1632         rcu_read_unlock();
1633         return err;
1634 }
1635 
1636 static int ipv6_count_addresses(struct inet6_dev *idev)
1637 {
1638         int cnt = 0;
1639         struct inet6_ifaddr *ifp;
1640 
1641         read_lock_bh(&idev->lock);
1642         list_for_each_entry(ifp, &idev->addr_list, if_list)
1643                 cnt++;
1644         read_unlock_bh(&idev->lock);
1645         return cnt;
1646 }
1647 
1648 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1649                   const struct net_device *dev, int strict)
1650 {
1651         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1652 }
1653 EXPORT_SYMBOL(ipv6_chk_addr);
1654 
1655 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1656                             const struct net_device *dev, int strict,
1657                             u32 banned_flags)
1658 {
1659         struct inet6_ifaddr *ifp;
1660         unsigned int hash = inet6_addr_hash(addr);
1661         u32 ifp_flags;
1662 
1663         rcu_read_lock_bh();
1664         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1665                 if (!net_eq(dev_net(ifp->idev->dev), net))
1666                         continue;
1667                 /* Decouple optimistic from tentative for evaluation here.
1668                  * Ban optimistic addresses explicitly, when required.
1669                  */
1670                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1671                             ? (ifp->flags&~IFA_F_TENTATIVE)
1672                             : ifp->flags;
1673                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1674                     !(ifp_flags&banned_flags) &&
1675                     (!dev || ifp->idev->dev == dev ||
1676                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1677                         rcu_read_unlock_bh();
1678                         return 1;
1679                 }
1680         }
1681 
1682         rcu_read_unlock_bh();
1683         return 0;
1684 }
1685 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1686 
1687 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1688                                struct net_device *dev)
1689 {
1690         unsigned int hash = inet6_addr_hash(addr);
1691         struct inet6_ifaddr *ifp;
1692 
1693         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1694                 if (!net_eq(dev_net(ifp->idev->dev), net))
1695                         continue;
1696                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1697                         if (!dev || ifp->idev->dev == dev)
1698                                 return true;
1699                 }
1700         }
1701         return false;
1702 }
1703 
1704 /* Compares an address/prefix_len with addresses on device @dev.
1705  * If one is found it returns true.
1706  */
1707 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1708         const unsigned int prefix_len, struct net_device *dev)
1709 {
1710         struct inet6_dev *idev;
1711         struct inet6_ifaddr *ifa;
1712         bool ret = false;
1713 
1714         rcu_read_lock();
1715         idev = __in6_dev_get(dev);
1716         if (idev) {
1717                 read_lock_bh(&idev->lock);
1718                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1719                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1720                         if (ret)
1721                                 break;
1722                 }
1723                 read_unlock_bh(&idev->lock);
1724         }
1725         rcu_read_unlock();
1726 
1727         return ret;
1728 }
1729 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1730 
1731 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1732 {
1733         struct inet6_dev *idev;
1734         struct inet6_ifaddr *ifa;
1735         int     onlink;
1736 
1737         onlink = 0;
1738         rcu_read_lock();
1739         idev = __in6_dev_get(dev);
1740         if (idev) {
1741                 read_lock_bh(&idev->lock);
1742                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1743                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1744                                                    ifa->prefix_len);
1745                         if (onlink)
1746                                 break;
1747                 }
1748                 read_unlock_bh(&idev->lock);
1749         }
1750         rcu_read_unlock();
1751         return onlink;
1752 }
1753 EXPORT_SYMBOL(ipv6_chk_prefix);
1754 
1755 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1756                                      struct net_device *dev, int strict)
1757 {
1758         struct inet6_ifaddr *ifp, *result = NULL;
1759         unsigned int hash = inet6_addr_hash(addr);
1760 
1761         rcu_read_lock_bh();
1762         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1763                 if (!net_eq(dev_net(ifp->idev->dev), net))
1764                         continue;
1765                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1766                         if (!dev || ifp->idev->dev == dev ||
1767                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1768                                 result = ifp;
1769                                 in6_ifa_hold(ifp);
1770                                 break;
1771                         }
1772                 }
1773         }
1774         rcu_read_unlock_bh();
1775 
1776         return result;
1777 }
1778 
1779 /* Gets referenced address, destroys ifaddr */
1780 
1781 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1782 {
1783         if (dad_failed)
1784                 ifp->flags |= IFA_F_DADFAILED;
1785 
1786         if (ifp->flags&IFA_F_PERMANENT) {
1787                 spin_lock_bh(&ifp->lock);
1788                 addrconf_del_dad_work(ifp);
1789                 ifp->flags |= IFA_F_TENTATIVE;
1790                 spin_unlock_bh(&ifp->lock);
1791                 if (dad_failed)
1792                         ipv6_ifa_notify(0, ifp);
1793                 in6_ifa_put(ifp);
1794         } else if (ifp->flags&IFA_F_TEMPORARY) {
1795                 struct inet6_ifaddr *ifpub;
1796                 spin_lock_bh(&ifp->lock);
1797                 ifpub = ifp->ifpub;
1798                 if (ifpub) {
1799                         in6_ifa_hold(ifpub);
1800                         spin_unlock_bh(&ifp->lock);
1801                         ipv6_create_tempaddr(ifpub, ifp);
1802                         in6_ifa_put(ifpub);
1803                 } else {
1804                         spin_unlock_bh(&ifp->lock);
1805                 }
1806                 ipv6_del_addr(ifp);
1807         } else {
1808                 ipv6_del_addr(ifp);
1809         }
1810 }
1811 
1812 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1813 {
1814         int err = -ENOENT;
1815 
1816         spin_lock_bh(&ifp->lock);
1817         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1818                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1819                 err = 0;
1820         }
1821         spin_unlock_bh(&ifp->lock);
1822 
1823         return err;
1824 }
1825 
1826 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1827 {
1828         struct in6_addr addr;
1829         struct inet6_dev *idev = ifp->idev;
1830         struct net *net = dev_net(ifp->idev->dev);
1831 
1832         if (addrconf_dad_end(ifp)) {
1833                 in6_ifa_put(ifp);
1834                 return;
1835         }
1836 
1837         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1838                              ifp->idev->dev->name, &ifp->addr);
1839 
1840         spin_lock_bh(&ifp->lock);
1841 
1842         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1843                 int scope = ifp->scope;
1844                 u32 flags = ifp->flags;
1845                 struct in6_addr new_addr;
1846                 struct inet6_ifaddr *ifp2;
1847                 u32 valid_lft, preferred_lft;
1848                 int pfxlen = ifp->prefix_len;
1849                 int retries = ifp->stable_privacy_retry + 1;
1850 
1851                 if (retries > net->ipv6.sysctl.idgen_retries) {
1852                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1853                                              ifp->idev->dev->name);
1854                         goto errdad;
1855                 }
1856 
1857                 new_addr = ifp->addr;
1858                 if (ipv6_generate_stable_address(&new_addr, retries,
1859                                                  idev))
1860                         goto errdad;
1861 
1862                 valid_lft = ifp->valid_lft;
1863                 preferred_lft = ifp->prefered_lft;
1864 
1865                 spin_unlock_bh(&ifp->lock);
1866 
1867                 if (idev->cnf.max_addresses &&
1868                     ipv6_count_addresses(idev) >=
1869                     idev->cnf.max_addresses)
1870                         goto lock_errdad;
1871 
1872                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1873                                      ifp->idev->dev->name);
1874 
1875                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1876                                      scope, flags, valid_lft,
1877                                      preferred_lft);
1878                 if (IS_ERR(ifp2))
1879                         goto lock_errdad;
1880 
1881                 spin_lock_bh(&ifp2->lock);
1882                 ifp2->stable_privacy_retry = retries;
1883                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1884                 spin_unlock_bh(&ifp2->lock);
1885 
1886                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1887                 in6_ifa_put(ifp2);
1888 lock_errdad:
1889                 spin_lock_bh(&ifp->lock);
1890         } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1891                 addr.s6_addr32[0] = htonl(0xfe800000);
1892                 addr.s6_addr32[1] = 0;
1893 
1894                 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1895                     ipv6_addr_equal(&ifp->addr, &addr)) {
1896                         /* DAD failed for link-local based on MAC address */
1897                         idev->cnf.disable_ipv6 = 1;
1898 
1899                         pr_info("%s: IPv6 being disabled!\n",
1900                                 ifp->idev->dev->name);
1901                 }
1902         }
1903 
1904 errdad:
1905         /* transition from _POSTDAD to _ERRDAD */
1906         ifp->state = INET6_IFADDR_STATE_ERRDAD;
1907         spin_unlock_bh(&ifp->lock);
1908 
1909         addrconf_mod_dad_work(ifp, 0);
1910 }
1911 
1912 /* Join to solicited addr multicast group.
1913  * caller must hold RTNL */
1914 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1915 {
1916         struct in6_addr maddr;
1917 
1918         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1919                 return;
1920 
1921         addrconf_addr_solict_mult(addr, &maddr);
1922         ipv6_dev_mc_inc(dev, &maddr);
1923 }
1924 
1925 /* caller must hold RTNL */
1926 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1927 {
1928         struct in6_addr maddr;
1929 
1930         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1931                 return;
1932 
1933         addrconf_addr_solict_mult(addr, &maddr);
1934         __ipv6_dev_mc_dec(idev, &maddr);
1935 }
1936 
1937 /* caller must hold RTNL */
1938 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1939 {
1940         struct in6_addr addr;
1941 
1942         if (ifp->prefix_len >= 127) /* RFC 6164 */
1943                 return;
1944         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1945         if (ipv6_addr_any(&addr))
1946                 return;
1947         __ipv6_dev_ac_inc(ifp->idev, &addr);
1948 }
1949 
1950 /* caller must hold RTNL */
1951 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1952 {
1953         struct in6_addr addr;
1954 
1955         if (ifp->prefix_len >= 127) /* RFC 6164 */
1956                 return;
1957         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1958         if (ipv6_addr_any(&addr))
1959                 return;
1960         __ipv6_dev_ac_dec(ifp->idev, &addr);
1961 }
1962 
1963 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1964 {
1965         if (dev->addr_len != EUI64_ADDR_LEN)
1966                 return -1;
1967         memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
1968         eui[0] ^= 2;
1969         return 0;
1970 }
1971 
1972 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1973 {
1974         union fwnet_hwaddr *ha;
1975 
1976         if (dev->addr_len != FWNET_ALEN)
1977                 return -1;
1978 
1979         ha = (union fwnet_hwaddr *)dev->dev_addr;
1980 
1981         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1982         eui[0] ^= 2;
1983         return 0;
1984 }
1985 
1986 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1987 {
1988         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1989         if (dev->addr_len != ARCNET_ALEN)
1990                 return -1;
1991         memset(eui, 0, 7);
1992         eui[7] = *(u8 *)dev->dev_addr;
1993         return 0;
1994 }
1995 
1996 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1997 {
1998         if (dev->addr_len != INFINIBAND_ALEN)
1999                 return -1;
2000         memcpy(eui, dev->dev_addr + 12, 8);
2001         eui[0] |= 2;
2002         return 0;
2003 }
2004 
2005 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2006 {
2007         if (addr == 0)
2008                 return -1;
2009         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2010                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2011                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2012                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2013                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2014                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2015         eui[1] = 0;
2016         eui[2] = 0x5E;
2017         eui[3] = 0xFE;
2018         memcpy(eui + 4, &addr, 4);
2019         return 0;
2020 }
2021 
2022 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2023 {
2024         if (dev->priv_flags & IFF_ISATAP)
2025                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2026         return -1;
2027 }
2028 
2029 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2030 {
2031         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2032 }
2033 
2034 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2035 {
2036         memcpy(eui, dev->perm_addr, 3);
2037         memcpy(eui + 5, dev->perm_addr + 3, 3);
2038         eui[3] = 0xFF;
2039         eui[4] = 0xFE;
2040         eui[0] ^= 2;
2041         return 0;
2042 }
2043 
2044 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2045 {
2046         switch (dev->type) {
2047         case ARPHRD_ETHER:
2048         case ARPHRD_FDDI:
2049                 return addrconf_ifid_eui48(eui, dev);
2050         case ARPHRD_ARCNET:
2051                 return addrconf_ifid_arcnet(eui, dev);
2052         case ARPHRD_INFINIBAND:
2053                 return addrconf_ifid_infiniband(eui, dev);
2054         case ARPHRD_SIT:
2055                 return addrconf_ifid_sit(eui, dev);
2056         case ARPHRD_IPGRE:
2057                 return addrconf_ifid_gre(eui, dev);
2058         case ARPHRD_6LOWPAN:
2059                 return addrconf_ifid_eui64(eui, dev);
2060         case ARPHRD_IEEE1394:
2061                 return addrconf_ifid_ieee1394(eui, dev);
2062         case ARPHRD_TUNNEL6:
2063                 return addrconf_ifid_ip6tnl(eui, dev);
2064         }
2065         return -1;
2066 }
2067 
2068 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2069 {
2070         int err = -1;
2071         struct inet6_ifaddr *ifp;
2072 
2073         read_lock_bh(&idev->lock);
2074         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2075                 if (ifp->scope > IFA_LINK)
2076                         break;
2077                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2078                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2079                         err = 0;
2080                         break;
2081                 }
2082         }
2083         read_unlock_bh(&idev->lock);
2084         return err;
2085 }
2086 
2087 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2088 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2089 {
2090 regen:
2091         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2092         idev->rndid[0] &= ~0x02;
2093 
2094         /*
2095          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2096          * check if generated address is not inappropriate
2097          *
2098          *  - Reserved subnet anycast (RFC 2526)
2099          *      11111101 11....11 1xxxxxxx
2100          *  - ISATAP (RFC4214) 6.1
2101          *      00-00-5E-FE-xx-xx-xx-xx
2102          *  - value 0
2103          *  - XXX: already assigned to an address on the device
2104          */
2105         if (idev->rndid[0] == 0xfd &&
2106             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2107             (idev->rndid[7]&0x80))
2108                 goto regen;
2109         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2110                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2111                         goto regen;
2112                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2113                         goto regen;
2114         }
2115 }
2116 
2117 static void ipv6_regen_rndid(unsigned long data)
2118 {
2119         struct inet6_dev *idev = (struct inet6_dev *) data;
2120         unsigned long expires;
2121 
2122         rcu_read_lock_bh();
2123         write_lock_bh(&idev->lock);
2124 
2125         if (idev->dead)
2126                 goto out;
2127 
2128         __ipv6_regen_rndid(idev);
2129 
2130         expires = jiffies +
2131                 idev->cnf.temp_prefered_lft * HZ -
2132                 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2133                 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2134                 idev->cnf.max_desync_factor * HZ;
2135         if (time_before(expires, jiffies)) {
2136                 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2137                         __func__, idev->dev->name);
2138                 goto out;
2139         }
2140 
2141         if (!mod_timer(&idev->regen_timer, expires))
2142                 in6_dev_hold(idev);
2143 
2144 out:
2145         write_unlock_bh(&idev->lock);
2146         rcu_read_unlock_bh();
2147         in6_dev_put(idev);
2148 }
2149 
2150 static void  __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2151 {
2152         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2153                 __ipv6_regen_rndid(idev);
2154 }
2155 
2156 /*
2157  *      Add prefix route.
2158  */
2159 
2160 static void
2161 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2162                       unsigned long expires, u32 flags)
2163 {
2164         struct fib6_config cfg = {
2165                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2166                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2167                 .fc_ifindex = dev->ifindex,
2168                 .fc_expires = expires,
2169                 .fc_dst_len = plen,
2170                 .fc_flags = RTF_UP | flags,
2171                 .fc_nlinfo.nl_net = dev_net(dev),
2172                 .fc_protocol = RTPROT_KERNEL,
2173         };
2174 
2175         cfg.fc_dst = *pfx;
2176 
2177         /* Prevent useless cloning on PtP SIT.
2178            This thing is done here expecting that the whole
2179            class of non-broadcast devices need not cloning.
2180          */
2181 #if IS_ENABLED(CONFIG_IPV6_SIT)
2182         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2183                 cfg.fc_flags |= RTF_NONEXTHOP;
2184 #endif
2185 
2186         ip6_route_add(&cfg);
2187 }
2188 
2189 
2190 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2191                                                   int plen,
2192                                                   const struct net_device *dev,
2193                                                   u32 flags, u32 noflags)
2194 {
2195         struct fib6_node *fn;
2196         struct rt6_info *rt = NULL;
2197         struct fib6_table *table;
2198         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2199 
2200         table = fib6_get_table(dev_net(dev), tb_id);
2201         if (!table)
2202                 return NULL;
2203 
2204         read_lock_bh(&table->tb6_lock);
2205         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2206         if (!fn)
2207                 goto out;
2208 
2209         noflags |= RTF_CACHE;
2210         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2211                 if (rt->dst.dev->ifindex != dev->ifindex)
2212                         continue;
2213                 if ((rt->rt6i_flags & flags) != flags)
2214                         continue;
2215                 if ((rt->rt6i_flags & noflags) != 0)
2216                         continue;
2217                 dst_hold(&rt->dst);
2218                 break;
2219         }
2220 out:
2221         read_unlock_bh(&table->tb6_lock);
2222         return rt;
2223 }
2224 
2225 
2226 /* Create "default" multicast route to the interface */
2227 
2228 static void addrconf_add_mroute(struct net_device *dev)
2229 {
2230         struct fib6_config cfg = {
2231                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2232                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2233                 .fc_ifindex = dev->ifindex,
2234                 .fc_dst_len = 8,
2235                 .fc_flags = RTF_UP,
2236                 .fc_nlinfo.nl_net = dev_net(dev),
2237         };
2238 
2239         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2240 
2241         ip6_route_add(&cfg);
2242 }
2243 
2244 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2245 {
2246         struct inet6_dev *idev;
2247 
2248         ASSERT_RTNL();
2249 
2250         idev = ipv6_find_idev(dev);
2251         if (!idev)
2252                 return ERR_PTR(-ENOBUFS);
2253 
2254         if (idev->cnf.disable_ipv6)
2255                 return ERR_PTR(-EACCES);
2256 
2257         /* Add default multicast route */
2258         if (!(dev->flags & IFF_LOOPBACK))
2259                 addrconf_add_mroute(dev);
2260 
2261         return idev;
2262 }
2263 
2264 static void manage_tempaddrs(struct inet6_dev *idev,
2265                              struct inet6_ifaddr *ifp,
2266                              __u32 valid_lft, __u32 prefered_lft,
2267                              bool create, unsigned long now)
2268 {
2269         u32 flags;
2270         struct inet6_ifaddr *ift;
2271 
2272         read_lock_bh(&idev->lock);
2273         /* update all temporary addresses in the list */
2274         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2275                 int age, max_valid, max_prefered;
2276 
2277                 if (ifp != ift->ifpub)
2278                         continue;
2279 
2280                 /* RFC 4941 section 3.3:
2281                  * If a received option will extend the lifetime of a public
2282                  * address, the lifetimes of temporary addresses should
2283                  * be extended, subject to the overall constraint that no
2284                  * temporary addresses should ever remain "valid" or "preferred"
2285                  * for a time longer than (TEMP_VALID_LIFETIME) or
2286                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2287                  */
2288                 age = (now - ift->cstamp) / HZ;
2289                 max_valid = idev->cnf.temp_valid_lft - age;
2290                 if (max_valid < 0)
2291                         max_valid = 0;
2292 
2293                 max_prefered = idev->cnf.temp_prefered_lft -
2294                                idev->cnf.max_desync_factor - age;
2295                 if (max_prefered < 0)
2296                         max_prefered = 0;
2297 
2298                 if (valid_lft > max_valid)
2299                         valid_lft = max_valid;
2300 
2301                 if (prefered_lft > max_prefered)
2302                         prefered_lft = max_prefered;
2303 
2304                 spin_lock(&ift->lock);
2305                 flags = ift->flags;
2306                 ift->valid_lft = valid_lft;
2307                 ift->prefered_lft = prefered_lft;
2308                 ift->tstamp = now;
2309                 if (prefered_lft > 0)
2310                         ift->flags &= ~IFA_F_DEPRECATED;
2311 
2312                 spin_unlock(&ift->lock);
2313                 if (!(flags&IFA_F_TENTATIVE))
2314                         ipv6_ifa_notify(0, ift);
2315         }
2316 
2317         if ((create || list_empty(&idev->tempaddr_list)) &&
2318             idev->cnf.use_tempaddr > 0) {
2319                 /* When a new public address is created as described
2320                  * in [ADDRCONF], also create a new temporary address.
2321                  * Also create a temporary address if it's enabled but
2322                  * no temporary address currently exists.
2323                  */
2324                 read_unlock_bh(&idev->lock);
2325                 ipv6_create_tempaddr(ifp, NULL);
2326         } else {
2327                 read_unlock_bh(&idev->lock);
2328         }
2329 }
2330 
2331 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2332 {
2333         return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2334                idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2335 }
2336 
2337 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2338 {
2339         struct prefix_info *pinfo;
2340         __u32 valid_lft;
2341         __u32 prefered_lft;
2342         int addr_type;
2343         u32 addr_flags = 0;
2344         struct inet6_dev *in6_dev;
2345         struct net *net = dev_net(dev);
2346 
2347         pinfo = (struct prefix_info *) opt;
2348 
2349         if (len < sizeof(struct prefix_info)) {
2350                 ADBG("addrconf: prefix option too short\n");
2351                 return;
2352         }
2353 
2354         /*
2355          *      Validation checks ([ADDRCONF], page 19)
2356          */
2357 
2358         addr_type = ipv6_addr_type(&pinfo->prefix);
2359 
2360         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2361                 return;
2362 
2363         valid_lft = ntohl(pinfo->valid);
2364         prefered_lft = ntohl(pinfo->prefered);
2365 
2366         if (prefered_lft > valid_lft) {
2367                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2368                 return;
2369         }
2370 
2371         in6_dev = in6_dev_get(dev);
2372 
2373         if (!in6_dev) {
2374                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2375                                     dev->name);
2376                 return;
2377         }
2378 
2379         /*
2380          *      Two things going on here:
2381          *      1) Add routes for on-link prefixes
2382          *      2) Configure prefixes with the auto flag set
2383          */
2384 
2385         if (pinfo->onlink) {
2386                 struct rt6_info *rt;
2387                 unsigned long rt_expires;
2388 
2389                 /* Avoid arithmetic overflow. Really, we could
2390                  * save rt_expires in seconds, likely valid_lft,
2391                  * but it would require division in fib gc, that it
2392                  * not good.
2393                  */
2394                 if (HZ > USER_HZ)
2395                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2396                 else
2397                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2398 
2399                 if (addrconf_finite_timeout(rt_expires))
2400                         rt_expires *= HZ;
2401 
2402                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2403                                                pinfo->prefix_len,
2404                                                dev,
2405                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2406                                                RTF_GATEWAY | RTF_DEFAULT);
2407 
2408                 if (rt) {
2409                         /* Autoconf prefix route */
2410                         if (valid_lft == 0) {
2411                                 ip6_del_rt(rt);
2412                                 rt = NULL;
2413                         } else if (addrconf_finite_timeout(rt_expires)) {
2414                                 /* not infinity */
2415                                 rt6_set_expires(rt, jiffies + rt_expires);
2416                         } else {
2417                                 rt6_clean_expires(rt);
2418                         }
2419                 } else if (valid_lft) {
2420                         clock_t expires = 0;
2421                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2422                         if (addrconf_finite_timeout(rt_expires)) {
2423                                 /* not infinity */
2424                                 flags |= RTF_EXPIRES;
2425                                 expires = jiffies_to_clock_t(rt_expires);
2426                         }
2427                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2428                                               dev, expires, flags);
2429                 }
2430                 ip6_rt_put(rt);
2431         }
2432 
2433         /* Try to figure out our local address for this prefix */
2434 
2435         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2436                 struct inet6_ifaddr *ifp;
2437                 struct in6_addr addr;
2438                 int create = 0, update_lft = 0;
2439                 bool tokenized = false;
2440 
2441                 if (pinfo->prefix_len == 64) {
2442                         memcpy(&addr, &pinfo->prefix, 8);
2443 
2444                         if (!ipv6_addr_any(&in6_dev->token)) {
2445                                 read_lock_bh(&in6_dev->lock);
2446                                 memcpy(addr.s6_addr + 8,
2447                                        in6_dev->token.s6_addr + 8, 8);
2448                                 read_unlock_bh(&in6_dev->lock);
2449                                 tokenized = true;
2450                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2451                                    !ipv6_generate_stable_address(&addr, 0,
2452                                                                  in6_dev)) {
2453                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2454                                 goto ok;
2455                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2456                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2457                                 in6_dev_put(in6_dev);
2458                                 return;
2459                         }
2460                         goto ok;
2461                 }
2462                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2463                                     pinfo->prefix_len);
2464                 in6_dev_put(in6_dev);
2465                 return;
2466 
2467 ok:
2468 
2469                 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2470 
2471                 if (!ifp && valid_lft) {
2472                         int max_addresses = in6_dev->cnf.max_addresses;
2473 
2474 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2475                         if (in6_dev->cnf.optimistic_dad &&
2476                             !net->ipv6.devconf_all->forwarding && sllao)
2477                                 addr_flags |= IFA_F_OPTIMISTIC;
2478 #endif
2479 
2480                         /* Do not allow to create too much of autoconfigured
2481                          * addresses; this would be too easy way to crash kernel.
2482                          */
2483                         if (!max_addresses ||
2484                             ipv6_count_addresses(in6_dev) < max_addresses)
2485                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2486                                                     pinfo->prefix_len,
2487                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
2488                                                     addr_flags, valid_lft,
2489                                                     prefered_lft);
2490 
2491                         if (IS_ERR_OR_NULL(ifp)) {
2492                                 in6_dev_put(in6_dev);
2493                                 return;
2494                         }
2495 
2496                         update_lft = 0;
2497                         create = 1;
2498                         spin_lock_bh(&ifp->lock);
2499                         ifp->flags |= IFA_F_MANAGETEMPADDR;
2500                         ifp->cstamp = jiffies;
2501                         ifp->tokenized = tokenized;
2502                         spin_unlock_bh(&ifp->lock);
2503                         addrconf_dad_start(ifp);
2504                 }
2505 
2506                 if (ifp) {
2507                         u32 flags;
2508                         unsigned long now;
2509                         u32 stored_lft;
2510 
2511                         /* update lifetime (RFC2462 5.5.3 e) */
2512                         spin_lock_bh(&ifp->lock);
2513                         now = jiffies;
2514                         if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2515                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2516                         else
2517                                 stored_lft = 0;
2518                         if (!update_lft && !create && stored_lft) {
2519                                 const u32 minimum_lft = min_t(u32,
2520                                         stored_lft, MIN_VALID_LIFETIME);
2521                                 valid_lft = max(valid_lft, minimum_lft);
2522 
2523                                 /* RFC4862 Section 5.5.3e:
2524                                  * "Note that the preferred lifetime of the
2525                                  *  corresponding address is always reset to
2526                                  *  the Preferred Lifetime in the received
2527                                  *  Prefix Information option, regardless of
2528                                  *  whether the valid lifetime is also reset or
2529                                  *  ignored."
2530                                  *
2531                                  * So we should always update prefered_lft here.
2532                                  */
2533                                 update_lft = 1;
2534                         }
2535 
2536                         if (update_lft) {
2537                                 ifp->valid_lft = valid_lft;
2538                                 ifp->prefered_lft = prefered_lft;
2539                                 ifp->tstamp = now;
2540                                 flags = ifp->flags;
2541                                 ifp->flags &= ~IFA_F_DEPRECATED;
2542                                 spin_unlock_bh(&ifp->lock);
2543 
2544                                 if (!(flags&IFA_F_TENTATIVE))
2545                                         ipv6_ifa_notify(0, ifp);
2546                         } else
2547                                 spin_unlock_bh(&ifp->lock);
2548 
2549                         manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2550                                          create, now);
2551 
2552                         in6_ifa_put(ifp);
2553                         addrconf_verify();
2554                 }
2555         }
2556         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2557         in6_dev_put(in6_dev);
2558 }
2559 
2560 /*
2561  *      Set destination address.
2562  *      Special case for SIT interfaces where we create a new "virtual"
2563  *      device.
2564  */
2565 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2566 {
2567         struct in6_ifreq ireq;
2568         struct net_device *dev;
2569         int err = -EINVAL;
2570 
2571         rtnl_lock();
2572 
2573         err = -EFAULT;
2574         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2575                 goto err_exit;
2576 
2577         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2578 
2579         err = -ENODEV;
2580         if (!dev)
2581                 goto err_exit;
2582 
2583 #if IS_ENABLED(CONFIG_IPV6_SIT)
2584         if (dev->type == ARPHRD_SIT) {
2585                 const struct net_device_ops *ops = dev->netdev_ops;
2586                 struct ifreq ifr;
2587                 struct ip_tunnel_parm p;
2588 
2589                 err = -EADDRNOTAVAIL;
2590                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2591                         goto err_exit;
2592 
2593                 memset(&p, 0, sizeof(p));
2594                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2595                 p.iph.saddr = 0;
2596                 p.iph.version = 4;
2597                 p.iph.ihl = 5;
2598                 p.iph.protocol = IPPROTO_IPV6;
2599                 p.iph.ttl = 64;
2600                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2601 
2602                 if (ops->ndo_do_ioctl) {
2603                         mm_segment_t oldfs = get_fs();
2604 
2605                         set_fs(KERNEL_DS);
2606                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2607                         set_fs(oldfs);
2608                 } else
2609                         err = -EOPNOTSUPP;
2610 
2611                 if (err == 0) {
2612                         err = -ENOBUFS;
2613                         dev = __dev_get_by_name(net, p.name);
2614                         if (!dev)
2615                                 goto err_exit;
2616                         err = dev_open(dev);
2617                 }
2618         }
2619 #endif
2620 
2621 err_exit:
2622         rtnl_unlock();
2623         return err;
2624 }
2625 
2626 static int ipv6_mc_config(struct sock *sk, bool join,
2627                           const struct in6_addr *addr, int ifindex)
2628 {
2629         int ret;
2630 
2631         ASSERT_RTNL();
2632 
2633         lock_sock(sk);
2634         if (join)
2635                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2636         else
2637                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2638         release_sock(sk);
2639 
2640         return ret;
2641 }
2642 
2643 /*
2644  *      Manual configuration of address on an interface
2645  */
2646 static int inet6_addr_add(struct net *net, int ifindex,
2647                           const struct in6_addr *pfx,
2648                           const struct in6_addr *peer_pfx,
2649                           unsigned int plen, __u32 ifa_flags,
2650                           __u32 prefered_lft, __u32 valid_lft)
2651 {
2652         struct inet6_ifaddr *ifp;
2653         struct inet6_dev *idev;
2654         struct net_device *dev;
2655         unsigned long timeout;
2656         clock_t expires;
2657         int scope;
2658         u32 flags;
2659 
2660         ASSERT_RTNL();
2661 
2662         if (plen > 128)
2663                 return -EINVAL;
2664 
2665         /* check the lifetime */
2666         if (!valid_lft || prefered_lft > valid_lft)
2667                 return -EINVAL;
2668 
2669         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2670                 return -EINVAL;
2671 
2672         dev = __dev_get_by_index(net, ifindex);
2673         if (!dev)
2674                 return -ENODEV;
2675 
2676         idev = addrconf_add_dev(dev);
2677         if (IS_ERR(idev))
2678                 return PTR_ERR(idev);
2679 
2680         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2681                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2682                                          true, pfx, ifindex);
2683 
2684                 if (ret < 0)
2685                         return ret;
2686         }
2687 
2688         scope = ipv6_addr_scope(pfx);
2689 
2690         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2691         if (addrconf_finite_timeout(timeout)) {
2692                 expires = jiffies_to_clock_t(timeout * HZ);
2693                 valid_lft = timeout;
2694                 flags = RTF_EXPIRES;
2695         } else {
2696                 expires = 0;
2697                 flags = 0;
2698                 ifa_flags |= IFA_F_PERMANENT;
2699         }
2700 
2701         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2702         if (addrconf_finite_timeout(timeout)) {
2703                 if (timeout == 0)
2704                         ifa_flags |= IFA_F_DEPRECATED;
2705                 prefered_lft = timeout;
2706         }
2707 
2708         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2709                             valid_lft, prefered_lft);
2710 
2711         if (!IS_ERR(ifp)) {
2712                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2713                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2714                                               expires, flags);
2715                 }
2716 
2717                 /*
2718                  * Note that section 3.1 of RFC 4429 indicates
2719                  * that the Optimistic flag should not be set for
2720                  * manually configured addresses
2721                  */
2722                 addrconf_dad_start(ifp);
2723                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2724                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2725                                          true, jiffies);
2726                 in6_ifa_put(ifp);
2727                 addrconf_verify_rtnl();
2728                 return 0;
2729         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2730                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2731                                false, pfx, ifindex);
2732         }
2733 
2734         return PTR_ERR(ifp);
2735 }
2736 
2737 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2738                           const struct in6_addr *pfx, unsigned int plen)
2739 {
2740         struct inet6_ifaddr *ifp;
2741         struct inet6_dev *idev;
2742         struct net_device *dev;
2743 
2744         if (plen > 128)
2745                 return -EINVAL;
2746 
2747         dev = __dev_get_by_index(net, ifindex);
2748         if (!dev)
2749                 return -ENODEV;
2750 
2751         idev = __in6_dev_get(dev);
2752         if (!idev)
2753                 return -ENXIO;
2754 
2755         read_lock_bh(&idev->lock);
2756         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2757                 if (ifp->prefix_len == plen &&
2758                     ipv6_addr_equal(pfx, &ifp->addr)) {
2759                         in6_ifa_hold(ifp);
2760                         read_unlock_bh(&idev->lock);
2761 
2762                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2763                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2764                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2765                                                  jiffies);
2766                         ipv6_del_addr(ifp);
2767                         addrconf_verify_rtnl();
2768                         if (ipv6_addr_is_multicast(pfx)) {
2769                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2770                                                false, pfx, dev->ifindex);
2771                         }
2772                         return 0;
2773                 }
2774         }
2775         read_unlock_bh(&idev->lock);
2776         return -EADDRNOTAVAIL;
2777 }
2778 
2779 
2780 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2781 {
2782         struct in6_ifreq ireq;
2783         int err;
2784 
2785         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2786                 return -EPERM;
2787 
2788         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2789                 return -EFAULT;
2790 
2791         rtnl_lock();
2792         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2793                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2794                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2795         rtnl_unlock();
2796         return err;
2797 }
2798 
2799 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2800 {
2801         struct in6_ifreq ireq;
2802         int err;
2803 
2804         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2805                 return -EPERM;
2806 
2807         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2808                 return -EFAULT;
2809 
2810         rtnl_lock();
2811         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2812                              ireq.ifr6_prefixlen);
2813         rtnl_unlock();
2814         return err;
2815 }
2816 
2817 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2818                      int plen, int scope)
2819 {
2820         struct inet6_ifaddr *ifp;
2821 
2822         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2823                             scope, IFA_F_PERMANENT,
2824                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2825         if (!IS_ERR(ifp)) {
2826                 spin_lock_bh(&ifp->lock);
2827                 ifp->flags &= ~IFA_F_TENTATIVE;
2828                 spin_unlock_bh(&ifp->lock);
2829                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2830                 in6_ifa_put(ifp);
2831         }
2832 }
2833 
2834 #if IS_ENABLED(CONFIG_IPV6_SIT)
2835 static void sit_add_v4_addrs(struct inet6_dev *idev)
2836 {
2837         struct in6_addr addr;
2838         struct net_device *dev;
2839         struct net *net = dev_net(idev->dev);
2840         int scope, plen;
2841         u32 pflags = 0;
2842 
2843         ASSERT_RTNL();
2844 
2845         memset(&addr, 0, sizeof(struct in6_addr));
2846         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2847 
2848         if (idev->dev->flags&IFF_POINTOPOINT) {
2849                 addr.s6_addr32[0] = htonl(0xfe800000);
2850                 scope = IFA_LINK;
2851                 plen = 64;
2852         } else {
2853                 scope = IPV6_ADDR_COMPATv4;
2854                 plen = 96;
2855                 pflags |= RTF_NONEXTHOP;
2856         }
2857 
2858         if (addr.s6_addr32[3]) {
2859                 add_addr(idev, &addr, plen, scope);
2860                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2861                 return;
2862         }
2863 
2864         for_each_netdev(net, dev) {
2865                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2866                 if (in_dev && (dev->flags & IFF_UP)) {
2867                         struct in_ifaddr *ifa;
2868 
2869                         int flag = scope;
2870 
2871                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2872 
2873                                 addr.s6_addr32[3] = ifa->ifa_local;
2874 
2875                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2876                                         continue;
2877                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2878                                         if (idev->dev->flags&IFF_POINTOPOINT)
2879                                                 continue;
2880                                         flag |= IFA_HOST;
2881                                 }
2882 
2883                                 add_addr(idev, &addr, plen, flag);
2884                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2885                                                       pflags);
2886                         }
2887                 }
2888         }
2889 }
2890 #endif
2891 
2892 static void init_loopback(struct net_device *dev)
2893 {
2894         struct inet6_dev  *idev;
2895         struct net_device *sp_dev;
2896         struct inet6_ifaddr *sp_ifa;
2897         struct rt6_info *sp_rt;
2898 
2899         /* ::1 */
2900 
2901         ASSERT_RTNL();
2902 
2903         idev = ipv6_find_idev(dev);
2904         if (!idev) {
2905                 pr_debug("%s: add_dev failed\n", __func__);
2906                 return;
2907         }
2908 
2909         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2910 
2911         /* Add routes to other interface's IPv6 addresses */
2912         for_each_netdev(dev_net(dev), sp_dev) {
2913                 if (!strcmp(sp_dev->name, dev->name))
2914                         continue;
2915 
2916                 idev = __in6_dev_get(sp_dev);
2917                 if (!idev)
2918                         continue;
2919 
2920                 read_lock_bh(&idev->lock);
2921                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2922 
2923                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2924                                 continue;
2925 
2926                         if (sp_ifa->rt) {
2927                                 /* This dst has been added to garbage list when
2928                                  * lo device down, release this obsolete dst and
2929                                  * reallocate a new router for ifa.
2930                                  */
2931                                 if (sp_ifa->rt->dst.obsolete > 0) {
2932                                         ip6_rt_put(sp_ifa->rt);
2933                                         sp_ifa->rt = NULL;
2934                                 } else {
2935                                         continue;
2936                                 }
2937                         }
2938 
2939                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2940 
2941                         /* Failure cases are ignored */
2942                         if (!IS_ERR(sp_rt)) {
2943                                 sp_ifa->rt = sp_rt;
2944                                 ip6_ins_rt(sp_rt);
2945                         }
2946                 }
2947                 read_unlock_bh(&idev->lock);
2948         }
2949 }
2950 
2951 static void addrconf_add_linklocal(struct inet6_dev *idev,
2952                                    const struct in6_addr *addr, u32 flags)
2953 {
2954         struct inet6_ifaddr *ifp;
2955         u32 addr_flags = flags | IFA_F_PERMANENT;
2956 
2957 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2958         if (idev->cnf.optimistic_dad &&
2959             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2960                 addr_flags |= IFA_F_OPTIMISTIC;
2961 #endif
2962 
2963         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2964                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2965         if (!IS_ERR(ifp)) {
2966                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2967                 addrconf_dad_start(ifp);
2968                 in6_ifa_put(ifp);
2969         }
2970 }
2971 
2972 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2973 {
2974         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2975                 return true;
2976 
2977         if (address.s6_addr32[2] == htonl(0x02005eff) &&
2978             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2979                 return true;
2980 
2981         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2982             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2983                 return true;
2984 
2985         return false;
2986 }
2987 
2988 static int ipv6_generate_stable_address(struct in6_addr *address,
2989                                         u8 dad_count,
2990                                         const struct inet6_dev *idev)
2991 {
2992         static DEFINE_SPINLOCK(lock);
2993         static __u32 digest[SHA_DIGEST_WORDS];
2994         static __u32 workspace[SHA_WORKSPACE_WORDS];
2995 
2996         static union {
2997                 char __data[SHA_MESSAGE_BYTES];
2998                 struct {
2999                         struct in6_addr secret;
3000                         __be32 prefix[2];
3001                         unsigned char hwaddr[MAX_ADDR_LEN];
3002                         u8 dad_count;
3003                 } __packed;
3004         } data;
3005 
3006         struct in6_addr secret;
3007         struct in6_addr temp;
3008         struct net *net = dev_net(idev->dev);
3009 
3010         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3011 
3012         if (idev->cnf.stable_secret.initialized)
3013                 secret = idev->cnf.stable_secret.secret;
3014         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3015                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3016         else
3017                 return -1;
3018 
3019 retry:
3020         spin_lock_bh(&lock);
3021 
3022         sha_init(digest);
3023         memset(&data, 0, sizeof(data));
3024         memset(workspace, 0, sizeof(workspace));
3025         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3026         data.prefix[0] = address->s6_addr32[0];
3027         data.prefix[1] = address->s6_addr32[1];
3028         data.secret = secret;
3029         data.dad_count = dad_count;
3030 
3031         sha_transform(digest, data.__data, workspace);
3032 
3033         temp = *address;
3034         temp.s6_addr32[2] = (__force __be32)digest[0];
3035         temp.s6_addr32[3] = (__force __be32)digest[1];
3036 
3037         spin_unlock_bh(&lock);
3038 
3039         if (ipv6_reserved_interfaceid(temp)) {
3040                 dad_count++;
3041                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3042                         return -1;
3043                 goto retry;
3044         }
3045 
3046         *address = temp;
3047         return 0;
3048 }
3049 
3050 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3051 {
3052         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3053 
3054         if (s->initialized)
3055                 return;
3056         s = &idev->cnf.stable_secret;
3057         get_random_bytes(&s->secret, sizeof(s->secret));
3058         s->initialized = true;
3059 }
3060 
3061 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3062 {
3063         struct in6_addr addr;
3064 
3065         /* no link local addresses on L3 master devices */
3066         if (netif_is_l3_master(idev->dev))
3067                 return;
3068 
3069         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3070 
3071         switch (idev->addr_gen_mode) {
3072         case IN6_ADDR_GEN_MODE_RANDOM:
3073                 ipv6_gen_mode_random_init(idev);
3074                 /* fallthrough */
3075         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3076                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3077                         addrconf_add_linklocal(idev, &addr,
3078                                                IFA_F_STABLE_PRIVACY);
3079                 else if (prefix_route)
3080                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3081                 break;
3082         case IN6_ADDR_GEN_MODE_EUI64:
3083                 /* addrconf_add_linklocal also adds a prefix_route and we
3084                  * only need to care about prefix routes if ipv6_generate_eui64
3085                  * couldn't generate one.
3086                  */
3087                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3088                         addrconf_add_linklocal(idev, &addr, 0);
3089                 else if (prefix_route)
3090                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3091                 break;
3092         case IN6_ADDR_GEN_MODE_NONE:
3093         default:
3094                 /* will not add any link local address */
3095                 break;
3096         }
3097 }
3098 
3099 static void addrconf_dev_config(struct net_device *dev)
3100 {
3101         struct inet6_dev *idev;
3102 
3103         ASSERT_RTNL();
3104 
3105         if ((dev->type != ARPHRD_ETHER) &&
3106             (dev->type != ARPHRD_FDDI) &&
3107             (dev->type != ARPHRD_ARCNET) &&
3108             (dev->type != ARPHRD_INFINIBAND) &&
3109             (dev->type != ARPHRD_IEEE1394) &&
3110             (dev->type != ARPHRD_TUNNEL6) &&
3111             (dev->type != ARPHRD_6LOWPAN) &&
3112             (dev->type != ARPHRD_NONE)) {
3113                 /* Alas, we support only Ethernet autoconfiguration. */
3114                 return;
3115         }
3116 
3117         idev = addrconf_add_dev(dev);
3118         if (IS_ERR(idev))
3119                 return;
3120 
3121         /* this device type has no EUI support */
3122         if (dev->type == ARPHRD_NONE &&
3123             idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3124                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3125 
3126         addrconf_addr_gen(idev, false);
3127 }
3128 
3129 #if IS_ENABLED(CONFIG_IPV6_SIT)
3130 static void addrconf_sit_config(struct net_device *dev)
3131 {
3132         struct inet6_dev *idev;
3133 
3134         ASSERT_RTNL();
3135 
3136         /*
3137          * Configure the tunnel with one of our IPv4
3138          * addresses... we should configure all of
3139          * our v4 addrs in the tunnel
3140          */
3141 
3142         idev = ipv6_find_idev(dev);
3143         if (!idev) {
3144                 pr_debug("%s: add_dev failed\n", __func__);
3145                 return;
3146         }
3147 
3148         if (dev->priv_flags & IFF_ISATAP) {
3149                 addrconf_addr_gen(idev, false);
3150                 return;
3151         }
3152 
3153         sit_add_v4_addrs(idev);
3154 
3155         if (dev->flags&IFF_POINTOPOINT)
3156                 addrconf_add_mroute(dev);
3157 }
3158 #endif
3159 
3160 #if IS_ENABLED(CONFIG_NET_IPGRE)
3161 static void addrconf_gre_config(struct net_device *dev)
3162 {
3163         struct inet6_dev *idev;
3164 
3165         ASSERT_RTNL();
3166 
3167         idev = ipv6_find_idev(dev);
3168         if (!idev) {
3169                 pr_debug("%s: add_dev failed\n", __func__);
3170                 return;
3171         }
3172 
3173         addrconf_addr_gen(idev, true);
3174         if (dev->flags & IFF_POINTOPOINT)
3175                 addrconf_add_mroute(dev);
3176 }
3177 #endif
3178 
3179 static int fixup_permanent_addr(struct inet6_dev *idev,
3180                                 struct inet6_ifaddr *ifp)
3181 {
3182         if (!ifp->rt) {
3183                 struct rt6_info *rt;
3184 
3185                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3186                 if (unlikely(IS_ERR(rt)))
3187                         return PTR_ERR(rt);
3188 
3189                 ifp->rt = rt;
3190         }
3191 
3192         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3193                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3194                                       idev->dev, 0, 0);
3195         }
3196 
3197         addrconf_dad_start(ifp);
3198 
3199         return 0;
3200 }
3201 
3202 static void addrconf_permanent_addr(struct net_device *dev)
3203 {
3204         struct inet6_ifaddr *ifp, *tmp;
3205         struct inet6_dev *idev;
3206 
3207         idev = __in6_dev_get(dev);
3208         if (!idev)
3209                 return;
3210 
3211         write_lock_bh(&idev->lock);
3212 
3213         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3214                 if ((ifp->flags & IFA_F_PERMANENT) &&
3215                     fixup_permanent_addr(idev, ifp) < 0) {
3216                         write_unlock_bh(&idev->lock);
3217                         ipv6_del_addr(ifp);
3218                         write_lock_bh(&idev->lock);
3219 
3220                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3221                                              idev->dev->name, &ifp->addr);
3222                 }
3223         }
3224 
3225         write_unlock_bh(&idev->lock);
3226 }
3227 
3228 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3229                            void *ptr)
3230 {
3231         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3232         struct netdev_notifier_changeupper_info *info;
3233         struct inet6_dev *idev = __in6_dev_get(dev);
3234         int run_pending = 0;
3235         int err;
3236 
3237         switch (event) {
3238         case NETDEV_REGISTER:
3239                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3240                         idev = ipv6_add_dev(dev);
3241                         if (IS_ERR(idev))
3242                                 return notifier_from_errno(PTR_ERR(idev));
3243                 }
3244                 break;
3245 
3246         case NETDEV_CHANGEMTU:
3247                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3248                 if (dev->mtu < IPV6_MIN_MTU) {
3249                         addrconf_ifdown(dev, 1);
3250                         break;
3251                 }
3252 
3253                 if (idev) {
3254                         rt6_mtu_change(dev, dev->mtu);
3255                         idev->cnf.mtu6 = dev->mtu;
3256                         break;
3257                 }
3258 
3259                 /* allocate new idev */
3260                 idev = ipv6_add_dev(dev);
3261                 if (IS_ERR(idev))
3262                         break;
3263 
3264                 /* device is still not ready */
3265                 if (!(idev->if_flags & IF_READY))
3266                         break;
3267 
3268                 run_pending = 1;
3269 
3270                 /* fall through */
3271 
3272         case NETDEV_UP:
3273         case NETDEV_CHANGE:
3274                 if (dev->flags & IFF_SLAVE)
3275                         break;
3276 
3277                 if (idev && idev->cnf.disable_ipv6)
3278                         break;
3279 
3280                 if (event == NETDEV_UP) {
3281                         /* restore routes for permanent addresses */
3282                         addrconf_permanent_addr(dev);
3283 
3284                         if (!addrconf_qdisc_ok(dev)) {
3285                                 /* device is not ready yet. */
3286                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3287                                         dev->name);
3288                                 break;
3289                         }
3290 
3291                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3292                                 idev = ipv6_add_dev(dev);
3293 
3294                         if (!IS_ERR_OR_NULL(idev)) {
3295                                 idev->if_flags |= IF_READY;
3296                                 run_pending = 1;
3297                         }
3298                 } else if (event == NETDEV_CHANGE) {
3299                         if (!addrconf_qdisc_ok(dev)) {
3300                                 /* device is still not ready. */
3301                                 break;
3302                         }
3303 
3304                         if (idev) {
3305                                 if (idev->if_flags & IF_READY)
3306                                         /* device is already configured. */
3307                                         break;
3308                                 idev->if_flags |= IF_READY;
3309                         }
3310 
3311                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3312                                 dev->name);
3313 
3314                         run_pending = 1;
3315                 }
3316 
3317                 switch (dev->type) {
3318 #if IS_ENABLED(CONFIG_IPV6_SIT)
3319                 case ARPHRD_SIT:
3320                         addrconf_sit_config(dev);
3321                         break;
3322 #endif
3323 #if IS_ENABLED(CONFIG_NET_IPGRE)
3324                 case ARPHRD_IPGRE:
3325                         addrconf_gre_config(dev);
3326                         break;
3327 #endif
3328                 case ARPHRD_LOOPBACK:
3329                         init_loopback(dev);
3330                         break;
3331 
3332                 default:
3333                         addrconf_dev_config(dev);
3334                         break;
3335                 }
3336 
3337                 if (!IS_ERR_OR_NULL(idev)) {
3338                         if (run_pending)
3339                                 addrconf_dad_run(idev);
3340 
3341                         /*
3342                          * If the MTU changed during the interface down,
3343                          * when the interface up, the changed MTU must be
3344                          * reflected in the idev as well as routers.
3345                          */
3346                         if (idev->cnf.mtu6 != dev->mtu &&
3347                             dev->mtu >= IPV6_MIN_MTU) {
3348                                 rt6_mtu_change(dev, dev->mtu);
3349                                 idev->cnf.mtu6 = dev->mtu;
3350                         }
3351                         idev->tstamp = jiffies;
3352                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3353 
3354                         /*
3355                          * If the changed mtu during down is lower than
3356                          * IPV6_MIN_MTU stop IPv6 on this interface.
3357                          */
3358                         if (dev->mtu < IPV6_MIN_MTU)
3359                                 addrconf_ifdown(dev, 1);
3360                 }
3361                 break;
3362 
3363         case NETDEV_DOWN:
3364         case NETDEV_UNREGISTER:
3365                 /*
3366                  *      Remove all addresses from this interface.
3367                  */
3368                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3369                 break;
3370 
3371         case NETDEV_CHANGENAME:
3372                 if (idev) {
3373                         snmp6_unregister_dev(idev);
3374                         addrconf_sysctl_unregister(idev);
3375                         err = addrconf_sysctl_register(idev);
3376                         if (err)
3377                                 return notifier_from_errno(err);
3378                         err = snmp6_register_dev(idev);
3379                         if (err) {
3380                                 addrconf_sysctl_unregister(idev);
3381                                 return notifier_from_errno(err);
3382                         }
3383                 }
3384                 break;
3385 
3386         case NETDEV_PRE_TYPE_CHANGE:
3387         case NETDEV_POST_TYPE_CHANGE:
3388                 if (idev)
3389                         addrconf_type_change(dev, event);
3390                 break;
3391 
3392         case NETDEV_CHANGEUPPER:
3393                 info = ptr;
3394 
3395                 /* flush all routes if dev is linked to or unlinked from
3396                  * an L3 master device (e.g., VRF)
3397                  */
3398                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3399                         addrconf_ifdown(dev, 0);
3400         }
3401 
3402         return NOTIFY_OK;
3403 }
3404 
3405 /*
3406  *      addrconf module should be notified of a device going up
3407  */
3408 static struct notifier_block ipv6_dev_notf = {
3409         .notifier_call = addrconf_notify,
3410 };
3411 
3412 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3413 {
3414         struct inet6_dev *idev;
3415         ASSERT_RTNL();
3416 
3417         idev = __in6_dev_get(dev);
3418 
3419         if (event == NETDEV_POST_TYPE_CHANGE)
3420                 ipv6_mc_remap(idev);
3421         else if (event == NETDEV_PRE_TYPE_CHANGE)
3422                 ipv6_mc_unmap(idev);
3423 }
3424 
3425 static bool addr_is_local(const struct in6_addr *addr)
3426 {
3427         return ipv6_addr_type(addr) &
3428                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3429 }
3430 
3431 static int addrconf_ifdown(struct net_device *dev, int how)
3432 {
3433         struct net *net = dev_net(dev);
3434         struct inet6_dev *idev;
3435         struct inet6_ifaddr *ifa, *tmp;
3436         struct list_head del_list;
3437         int _keep_addr;
3438         bool keep_addr;
3439         int state, i;
3440 
3441         ASSERT_RTNL();
3442 
3443         rt6_ifdown(net, dev);
3444         neigh_ifdown(&nd_tbl, dev);
3445 
3446         idev = __in6_dev_get(dev);
3447         if (!idev)
3448                 return -ENODEV;
3449 
3450         /*
3451          * Step 1: remove reference to ipv6 device from parent device.
3452          *         Do not dev_put!
3453          */
3454         if (how) {
3455                 idev->dead = 1;
3456 
3457                 /* protected by rtnl_lock */
3458                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3459 
3460                 /* Step 1.5: remove snmp6 entry */
3461                 snmp6_unregister_dev(idev);
3462 
3463         }
3464 
3465         /* aggregate the system setting and interface setting */
3466         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3467         if (!_keep_addr)
3468                 _keep_addr = idev->cnf.keep_addr_on_down;
3469 
3470         /* combine the user config with event to determine if permanent
3471          * addresses are to be removed from address hash table
3472          */
3473         keep_addr = !(how || _keep_addr <= 0);
3474 
3475         /* Step 2: clear hash table */
3476         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3477                 struct hlist_head *h = &inet6_addr_lst[i];
3478 
3479                 spin_lock_bh(&addrconf_hash_lock);
3480 restart:
3481                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3482                         if (ifa->idev == idev) {
3483                                 addrconf_del_dad_work(ifa);
3484                                 /* combined flag + permanent flag decide if
3485                                  * address is retained on a down event
3486                                  */
3487                                 if (!keep_addr ||
3488                                     !(ifa->flags & IFA_F_PERMANENT) ||
3489                                     addr_is_local(&ifa->addr)) {
3490                                         hlist_del_init_rcu(&ifa->addr_lst);
3491                                         goto restart;
3492                                 }
3493                         }
3494                 }
3495                 spin_unlock_bh(&addrconf_hash_lock);
3496         }
3497 
3498         write_lock_bh(&idev->lock);
3499 
3500         addrconf_del_rs_timer(idev);
3501 
3502         /* Step 2: clear flags for stateless addrconf */
3503         if (!how)
3504                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3505 
3506         if (how && del_timer(&idev->regen_timer))
3507                 in6_dev_put(idev);
3508 
3509         /* Step 3: clear tempaddr list */
3510         while (!list_empty(&idev->tempaddr_list)) {
3511                 ifa = list_first_entry(&idev->tempaddr_list,
3512                                        struct inet6_ifaddr, tmp_list);
3513                 list_del(&ifa->tmp_list);
3514                 write_unlock_bh(&idev->lock);
3515                 spin_lock_bh(&ifa->lock);
3516 
3517                 if (ifa->ifpub) {
3518                         in6_ifa_put(ifa->ifpub);
3519                         ifa->ifpub = NULL;
3520                 }
3521                 spin_unlock_bh(&ifa->lock);
3522                 in6_ifa_put(ifa);
3523                 write_lock_bh(&idev->lock);
3524         }
3525 
3526         /* re-combine the user config with event to determine if permanent
3527          * addresses are to be removed from the interface list
3528          */
3529         keep_addr = (!how && _keep_addr > 0);
3530 
3531         INIT_LIST_HEAD(&del_list);
3532         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3533                 struct rt6_info *rt = NULL;
3534 
3535                 addrconf_del_dad_work(ifa);
3536 
3537                 write_unlock_bh(&idev->lock);
3538                 spin_lock_bh(&ifa->lock);
3539 
3540                 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3541                     !addr_is_local(&ifa->addr)) {
3542                         /* set state to skip the notifier below */
3543                         state = INET6_IFADDR_STATE_DEAD;
3544                         ifa->state = 0;
3545                         if (!(ifa->flags & IFA_F_NODAD))
3546                                 ifa->flags |= IFA_F_TENTATIVE;
3547 
3548                         rt = ifa->rt;
3549                         ifa->rt = NULL;
3550                 } else {
3551                         state = ifa->state;
3552                         ifa->state = INET6_IFADDR_STATE_DEAD;
3553 
3554                         list_del(&ifa->if_list);
3555                         list_add(&ifa->if_list, &del_list);
3556                 }
3557 
3558                 spin_unlock_bh(&ifa->lock);
3559 
3560                 if (rt)
3561                         ip6_del_rt(rt);
3562 
3563                 if (state != INET6_IFADDR_STATE_DEAD) {
3564                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3565                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3566                 } else {
3567                         if (idev->cnf.forwarding)
3568                                 addrconf_leave_anycast(ifa);
3569                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3570                 }
3571 
3572                 write_lock_bh(&idev->lock);
3573         }
3574 
3575         write_unlock_bh(&idev->lock);
3576 
3577         /* now clean up addresses to be removed */
3578         while (!list_empty(&del_list)) {
3579                 ifa = list_first_entry(&del_list,
3580                                        struct inet6_ifaddr, if_list);
3581                 list_del(&ifa->if_list);
3582 
3583                 in6_ifa_put(ifa);
3584         }
3585 
3586         /* Step 5: Discard anycast and multicast list */
3587         if (how) {
3588                 ipv6_ac_destroy_dev(idev);
3589                 ipv6_mc_destroy_dev(idev);
3590         } else {
3591                 ipv6_mc_down(idev);
3592         }
3593 
3594         idev->tstamp = jiffies;
3595 
3596         /* Last: Shot the device (if unregistered) */
3597         if (how) {
3598                 addrconf_sysctl_unregister(idev);
3599                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3600                 neigh_ifdown(&nd_tbl, dev);
3601                 in6_dev_put(idev);
3602         }
3603         return 0;
3604 }
3605 
3606 static void addrconf_rs_timer(unsigned long data)
3607 {
3608         struct inet6_dev *idev = (struct inet6_dev *)data;
3609         struct net_device *dev = idev->dev;
3610         struct in6_addr lladdr;
3611 
3612         write_lock(&idev->lock);
3613         if (idev->dead || !(idev->if_flags & IF_READY))
3614                 goto out;
3615 
3616         if (!ipv6_accept_ra(idev))
3617                 goto out;
3618 
3619         /* Announcement received after solicitation was sent */
3620         if (idev->if_flags & IF_RA_RCVD)
3621                 goto out;
3622 
3623         if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3624                 write_unlock(&idev->lock);
3625                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3626                         ndisc_send_rs(dev, &lladdr,
3627                                       &in6addr_linklocal_allrouters);
3628                 else
3629                         goto put;
3630 
3631                 write_lock(&idev->lock);
3632                 /* The wait after the last probe can be shorter */
3633                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3634                                              idev->cnf.rtr_solicits) ?
3635                                       idev->cnf.rtr_solicit_delay :
3636                                       idev->cnf.rtr_solicit_interval);
3637         } else {
3638                 /*
3639                  * Note: we do not support deprecated "all on-link"
3640                  * assumption any longer.
3641                  */
3642                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3643         }
3644 
3645 out:
3646         write_unlock(&idev->lock);
3647 put:
3648         in6_dev_put(idev);
3649 }
3650 
3651 /*
3652  *      Duplicate Address Detection
3653  */
3654 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3655 {
3656         unsigned long rand_num;
3657         struct inet6_dev *idev = ifp->idev;
3658 
3659         if (ifp->flags & IFA_F_OPTIMISTIC)
3660                 rand_num = 0;
3661         else
3662                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3663 
3664         ifp->dad_probes = idev->cnf.dad_transmits;
3665         addrconf_mod_dad_work(ifp, rand_num);
3666 }
3667 
3668 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3669 {
3670         struct inet6_dev *idev = ifp->idev;
3671         struct net_device *dev = idev->dev;
3672         bool notify = false;
3673 
3674         addrconf_join_solict(dev, &ifp->addr);
3675 
3676         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3677 
3678         read_lock_bh(&idev->lock);
3679         spin_lock(&ifp->lock);
3680         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3681                 goto out;
3682 
3683         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3684             idev->cnf.accept_dad < 1 ||
3685             !(ifp->flags&IFA_F_TENTATIVE) ||
3686             ifp->flags & IFA_F_NODAD) {
3687                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3688                 spin_unlock(&ifp->lock);
3689                 read_unlock_bh(&idev->lock);
3690 
3691                 addrconf_dad_completed(ifp);
3692                 return;
3693         }
3694 
3695         if (!(idev->if_flags & IF_READY)) {
3696                 spin_unlock(&ifp->lock);
3697                 read_unlock_bh(&idev->lock);
3698                 /*
3699                  * If the device is not ready:
3700                  * - keep it tentative if it is a permanent address.
3701                  * - otherwise, kill it.
3702                  */
3703                 in6_ifa_hold(ifp);
3704                 addrconf_dad_stop(ifp, 0);
3705                 return;
3706         }
3707 
3708         /*
3709          * Optimistic nodes can start receiving
3710          * Frames right away
3711          */
3712         if (ifp->flags & IFA_F_OPTIMISTIC) {
3713                 ip6_ins_rt(ifp->rt);
3714                 if (ipv6_use_optimistic_addr(idev)) {
3715                         /* Because optimistic nodes can use this address,
3716                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3717                          */
3718                         notify = true;
3719                 }
3720         }
3721 
3722         addrconf_dad_kick(ifp);
3723 out:
3724         spin_unlock(&ifp->lock);
3725         read_unlock_bh(&idev->lock);
3726         if (notify)
3727                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3728 }
3729 
3730 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3731 {
3732         bool begin_dad = false;
3733 
3734         spin_lock_bh(&ifp->lock);
3735         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3736                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3737                 begin_dad = true;
3738         }
3739         spin_unlock_bh(&ifp->lock);
3740 
3741         if (begin_dad)
3742                 addrconf_mod_dad_work(ifp, 0);
3743 }
3744 
3745 static void addrconf_dad_work(struct work_struct *w)
3746 {
3747         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3748                                                 struct inet6_ifaddr,
3749                                                 dad_work);
3750         struct inet6_dev *idev = ifp->idev;
3751         struct in6_addr mcaddr;
3752 
3753         enum {
3754                 DAD_PROCESS,
3755                 DAD_BEGIN,
3756                 DAD_ABORT,
3757         } action = DAD_PROCESS;
3758 
3759         rtnl_lock();
3760 
3761         spin_lock_bh(&ifp->lock);
3762         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3763                 action = DAD_BEGIN;
3764                 ifp->state = INET6_IFADDR_STATE_DAD;
3765         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3766                 action = DAD_ABORT;
3767                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3768         }
3769         spin_unlock_bh(&ifp->lock);
3770 
3771         if (action == DAD_BEGIN) {
3772                 addrconf_dad_begin(ifp);
3773                 goto out;
3774         } else if (action == DAD_ABORT) {
3775                 addrconf_dad_stop(ifp, 1);
3776                 goto out;
3777         }
3778 
3779         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3780                 goto out;
3781 
3782         write_lock_bh(&idev->lock);
3783         if (idev->dead || !(idev->if_flags & IF_READY)) {
3784                 write_unlock_bh(&idev->lock);
3785                 goto out;
3786         }
3787 
3788         spin_lock(&ifp->lock);
3789         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3790                 spin_unlock(&ifp->lock);
3791                 write_unlock_bh(&idev->lock);
3792                 goto out;
3793         }
3794 
3795         if (ifp->dad_probes == 0) {
3796                 /*
3797                  * DAD was successful
3798                  */
3799 
3800                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3801                 spin_unlock(&ifp->lock);
3802                 write_unlock_bh(&idev->lock);
3803 
3804                 addrconf_dad_completed(ifp);
3805 
3806                 goto out;
3807         }
3808 
3809         ifp->dad_probes--;
3810         addrconf_mod_dad_work(ifp,
3811                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3812         spin_unlock(&ifp->lock);
3813         write_unlock_bh(&idev->lock);
3814 
3815         /* send a neighbour solicitation for our addr */
3816         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3817         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3818 out:
3819         in6_ifa_put(ifp);
3820         rtnl_unlock();
3821 }
3822 
3823 /* ifp->idev must be at least read locked */
3824 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3825 {
3826         struct inet6_ifaddr *ifpiter;
3827         struct inet6_dev *idev = ifp->idev;
3828 
3829         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3830                 if (ifpiter->scope > IFA_LINK)
3831                         break;
3832                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3833                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3834                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3835                     IFA_F_PERMANENT)
3836                         return false;
3837         }
3838         return true;
3839 }
3840 
3841 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3842 {
3843         struct net_device *dev = ifp->idev->dev;
3844         struct in6_addr lladdr;
3845         bool send_rs, send_mld;
3846 
3847         addrconf_del_dad_work(ifp);
3848 
3849         /*
3850          *      Configure the address for reception. Now it is valid.
3851          */
3852 
3853         ipv6_ifa_notify(RTM_NEWADDR, ifp);
3854 
3855         /* If added prefix is link local and we are prepared to process
3856            router advertisements, start sending router solicitations.
3857          */
3858 
3859         read_lock_bh(&ifp->idev->lock);
3860         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3861         send_rs = send_mld &&
3862                   ipv6_accept_ra(ifp->idev) &&
3863                   ifp->idev->cnf.rtr_solicits > 0 &&
3864                   (dev->flags&IFF_LOOPBACK) == 0;
3865         read_unlock_bh(&ifp->idev->lock);
3866 
3867         /* While dad is in progress mld report's source address is in6_addrany.
3868          * Resend with proper ll now.
3869          */
3870         if (send_mld)
3871                 ipv6_mc_dad_complete(ifp->idev);
3872 
3873         if (send_rs) {
3874                 /*
3875                  *      If a host as already performed a random delay
3876                  *      [...] as part of DAD [...] there is no need
3877                  *      to delay again before sending the first RS
3878                  */
3879                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3880                         return;
3881                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3882 
3883                 write_lock_bh(&ifp->idev->lock);
3884                 spin_lock(&ifp->lock);
3885                 ifp->idev->rs_probes = 1;
3886                 ifp->idev->if_flags |= IF_RS_SENT;
3887                 addrconf_mod_rs_timer(ifp->idev,
3888                                       ifp->idev->cnf.rtr_solicit_interval);
3889                 spin_unlock(&ifp->lock);
3890                 write_unlock_bh(&ifp->idev->lock);
3891         }
3892 }
3893 
3894 static void addrconf_dad_run(struct inet6_dev *idev)
3895 {
3896         struct inet6_ifaddr *ifp;
3897 
3898         read_lock_bh(&idev->lock);
3899         list_for_each_entry(ifp, &idev->addr_list, if_list) {
3900                 spin_lock(&ifp->lock);
3901                 if (ifp->flags & IFA_F_TENTATIVE &&
3902                     ifp->state == INET6_IFADDR_STATE_DAD)
3903                         addrconf_dad_kick(ifp);
3904                 spin_unlock(&ifp->lock);
3905         }
3906         read_unlock_bh(&idev->lock);
3907 }
3908 
3909 #ifdef CONFIG_PROC_FS
3910 struct if6_iter_state {
3911         struct seq_net_private p;
3912         int bucket;
3913         int offset;
3914 };
3915 
3916 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3917 {
3918         struct inet6_ifaddr *ifa = NULL;
3919         struct if6_iter_state *state = seq->private;
3920         struct net *net = seq_file_net(seq);
3921         int p = 0;
3922 
3923         /* initial bucket if pos is 0 */
3924         if (pos == 0) {
3925                 state->bucket = 0;
3926                 state->offset = 0;
3927         }
3928 
3929         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3930                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3931                                          addr_lst) {
3932                         if (!net_eq(dev_net(ifa->idev->dev), net))
3933                                 continue;
3934                         /* sync with offset */
3935                         if (p < state->offset) {
3936                                 p++;
3937                                 continue;
3938                         }
3939                         state->offset++;
3940                         return ifa;
3941                 }
3942 
3943                 /* prepare for next bucket */
3944                 state->offset = 0;
3945                 p = 0;
3946         }
3947         return NULL;
3948 }
3949 
3950 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3951                                          struct inet6_ifaddr *ifa)
3952 {
3953         struct if6_iter_state *state = seq->private;
3954         struct net *net = seq_file_net(seq);
3955 
3956         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3957                 if (!net_eq(dev_net(ifa->idev->dev), net))
3958                         continue;
3959                 state->offset++;
3960                 return ifa;
3961         }
3962 
3963         while (++state->bucket < IN6_ADDR_HSIZE) {
3964                 state->offset = 0;
3965                 hlist_for_each_entry_rcu_bh(ifa,
3966                                      &inet6_addr_lst[state->bucket], addr_lst) {
3967                         if (!net_eq(dev_net(ifa->idev->dev), net))
3968                                 continue;
3969                         state->offset++;
3970                         return ifa;
3971                 }
3972         }
3973 
3974         return NULL;
3975 }
3976 
3977 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3978         __acquires(rcu_bh)
3979 {
3980         rcu_read_lock_bh();
3981         return if6_get_first(seq, *pos);
3982 }
3983 
3984 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3985 {
3986         struct inet6_ifaddr *ifa;
3987 
3988         ifa = if6_get_next(seq, v);
3989         ++*pos;
3990         return ifa;
3991 }
3992 
3993 static void if6_seq_stop(struct seq_file *seq, void *v)
3994         __releases(rcu_bh)
3995 {
3996         rcu_read_unlock_bh();
3997 }
3998 
3999 static int if6_seq_show(struct seq_file *seq, void *v)
4000 {
4001         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4002         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4003                    &ifp->addr,
4004                    ifp->idev->dev->ifindex,
4005                    ifp->prefix_len,
4006                    ifp->scope,
4007                    (u8) ifp->flags,
4008                    ifp->idev->dev->name);
4009         return 0;
4010 }
4011 
4012 static const struct seq_operations if6_seq_ops = {
4013         .start  = if6_seq_start,
4014         .next   = if6_seq_next,
4015         .show   = if6_seq_show,
4016         .stop   = if6_seq_stop,
4017 };
4018 
4019 static int if6_seq_open(struct inode *inode, struct file *file)
4020 {
4021         return seq_open_net(inode, file, &if6_seq_ops,
4022                             sizeof(struct if6_iter_state));
4023 }
4024 
4025 static const struct file_operations if6_fops = {
4026         .owner          = THIS_MODULE,
4027         .open           = if6_seq_open,
4028         .read           = seq_read,
4029         .llseek         = seq_lseek,
4030         .release        = seq_release_net,
4031 };
4032 
4033 static int __net_init if6_proc_net_init(struct net *net)
4034 {
4035         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4036                 return -ENOMEM;
4037         return 0;
4038 }
4039 
4040 static void __net_exit if6_proc_net_exit(struct net *net)
4041 {
4042         remove_proc_entry("if_inet6", net->proc_net);
4043 }
4044 
4045 static struct pernet_operations if6_proc_net_ops = {
4046         .init = if6_proc_net_init,
4047         .exit = if6_proc_net_exit,
4048 };
4049 
4050 int __init if6_proc_init(void)
4051 {
4052         return register_pernet_subsys(&if6_proc_net_ops);
4053 }
4054 
4055 void if6_proc_exit(void)
4056 {
4057         unregister_pernet_subsys(&if6_proc_net_ops);
4058 }
4059 #endif  /* CONFIG_PROC_FS */
4060 
4061 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4062 /* Check if address is a home address configured on any interface. */
4063 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4064 {
4065         int ret = 0;
4066         struct inet6_ifaddr *ifp = NULL;
4067         unsigned int hash = inet6_addr_hash(addr);
4068 
4069         rcu_read_lock_bh();
4070         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4071                 if (!net_eq(dev_net(ifp->idev->dev), net))
4072                         continue;
4073                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4074                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4075                         ret = 1;
4076                         break;
4077                 }
4078         }
4079         rcu_read_unlock_bh();
4080         return ret;
4081 }
4082 #endif
4083 
4084 /*
4085  *      Periodic address status verification
4086  */
4087 
4088 static void addrconf_verify_rtnl(void)
4089 {
4090         unsigned long now, next, next_sec, next_sched;
4091         struct inet6_ifaddr *ifp;
4092         int i;
4093 
4094         ASSERT_RTNL();
4095 
4096         rcu_read_lock_bh();
4097         now = jiffies;
4098         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4099 
4100         cancel_delayed_work(&addr_chk_work);
4101 
4102         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4103 restart:
4104                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4105                         unsigned long age;
4106 
4107                         /* When setting preferred_lft to a value not zero or
4108                          * infinity, while valid_lft is infinity
4109                          * IFA_F_PERMANENT has a non-infinity life time.
4110                          */
4111                         if ((ifp->flags & IFA_F_PERMANENT) &&
4112                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4113                                 continue;
4114 
4115                         spin_lock(&ifp->lock);
4116                         /* We try to batch several events at once. */
4117                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4118 
4119                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4120                             age >= ifp->valid_lft) {
4121                                 spin_unlock(&ifp->lock);
4122                                 in6_ifa_hold(ifp);
4123                                 ipv6_del_addr(ifp);
4124                                 goto restart;
4125                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4126                                 spin_unlock(&ifp->lock);
4127                                 continue;
4128                         } else if (age >= ifp->prefered_lft) {
4129                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4130                                 int deprecate = 0;
4131 
4132                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4133                                         deprecate = 1;
4134                                         ifp->flags |= IFA_F_DEPRECATED;
4135                                 }
4136 
4137                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4138                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4139                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4140 
4141                                 spin_unlock(&ifp->lock);
4142 
4143                                 if (deprecate) {
4144                                         in6_ifa_hold(ifp);
4145 
4146                                         ipv6_ifa_notify(0, ifp);
4147                                         in6_ifa_put(ifp);
4148                                         goto restart;
4149                                 }
4150                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4151                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4152                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4153                                         ifp->idev->cnf.dad_transmits *
4154                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4155 
4156                                 if (age >= ifp->prefered_lft - regen_advance) {
4157                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4158                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4159                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4160                                         if (!ifp->regen_count && ifpub) {
4161                                                 ifp->regen_count++;
4162                                                 in6_ifa_hold(ifp);
4163                                                 in6_ifa_hold(ifpub);
4164                                                 spin_unlock(&ifp->lock);
4165 
4166                                                 spin_lock(&ifpub->lock);
4167                                                 ifpub->regen_count = 0;
4168                                                 spin_unlock(&ifpub->lock);
4169                                                 ipv6_create_tempaddr(ifpub, ifp);
4170                                                 in6_ifa_put(ifpub);
4171                                                 in6_ifa_put(ifp);
4172                                                 goto restart;
4173                                         }
4174                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4175                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4176                                 spin_unlock(&ifp->lock);
4177                         } else {
4178                                 /* ifp->prefered_lft <= ifp->valid_lft */
4179                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4180                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4181                                 spin_unlock(&ifp->lock);
4182                         }
4183                 }
4184         }
4185 
4186         next_sec = round_jiffies_up(next);
4187         next_sched = next;
4188 
4189         /* If rounded timeout is accurate enough, accept it. */
4190         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4191                 next_sched = next_sec;
4192 
4193         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4194         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4195                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4196 
4197         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4198               now, next, next_sec, next_sched);
4199         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4200         rcu_read_unlock_bh();
4201 }
4202 
4203 static void addrconf_verify_work(struct work_struct *w)
4204 {
4205         rtnl_lock();
4206         addrconf_verify_rtnl();
4207         rtnl_unlock();
4208 }
4209 
4210 static void addrconf_verify(void)
4211 {
4212         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4213 }
4214 
4215 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4216                                      struct in6_addr **peer_pfx)
4217 {
4218         struct in6_addr *pfx = NULL;
4219 
4220         *peer_pfx = NULL;
4221 
4222         if (addr)
4223                 pfx = nla_data(addr);
4224 
4225         if (local) {
4226                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4227                         *peer_pfx = pfx;
4228                 pfx = nla_data(local);
4229         }
4230 
4231         return pfx;
4232 }
4233 
4234 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4235         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4236         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4237         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4238         [IFA_FLAGS]             = { .len = sizeof(u32) },
4239 };
4240 
4241 static int
4242 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4243 {
4244         struct net *net = sock_net(skb->sk);
4245         struct ifaddrmsg *ifm;
4246         struct nlattr *tb[IFA_MAX+1];
4247         struct in6_addr *pfx, *peer_pfx;
4248         u32 ifa_flags;
4249         int err;
4250 
4251         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4252         if (err < 0)
4253                 return err;
4254 
4255         ifm = nlmsg_data(nlh);
4256         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4257         if (!pfx)
4258                 return -EINVAL;
4259 
4260         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4261 
4262         /* We ignore other flags so far. */
4263         ifa_flags &= IFA_F_MANAGETEMPADDR;
4264 
4265         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4266                               ifm->ifa_prefixlen);
4267 }
4268 
4269 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4270                              u32 prefered_lft, u32 valid_lft)
4271 {
4272         u32 flags;
4273         clock_t expires;
4274         unsigned long timeout;
4275         bool was_managetempaddr;
4276         bool had_prefixroute;
4277 
4278         ASSERT_RTNL();
4279 
4280         if (!valid_lft || (prefered_lft > valid_lft))
4281                 return -EINVAL;
4282 
4283         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4284             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4285                 return -EINVAL;
4286 
4287         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4288         if (addrconf_finite_timeout(timeout)) {
4289                 expires = jiffies_to_clock_t(timeout * HZ);
4290                 valid_lft = timeout;
4291                 flags = RTF_EXPIRES;
4292         } else {
4293                 expires = 0;
4294                 flags = 0;
4295                 ifa_flags |= IFA_F_PERMANENT;
4296         }
4297 
4298         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4299         if (addrconf_finite_timeout(timeout)) {
4300                 if (timeout == 0)
4301                         ifa_flags |= IFA_F_DEPRECATED;
4302                 prefered_lft = timeout;
4303         }
4304 
4305         spin_lock_bh(&ifp->lock);
4306         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4307         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4308                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4309         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4310                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4311                         IFA_F_NOPREFIXROUTE);
4312         ifp->flags |= ifa_flags;
4313         ifp->tstamp = jiffies;
4314         ifp->valid_lft = valid_lft;
4315         ifp->prefered_lft = prefered_lft;
4316 
4317         spin_unlock_bh(&ifp->lock);
4318         if (!(ifp->flags&IFA_F_TENTATIVE))
4319                 ipv6_ifa_notify(0, ifp);
4320 
4321         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4322                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4323                                       expires, flags);
4324         } else if (had_prefixroute) {
4325                 enum cleanup_prefix_rt_t action;
4326                 unsigned long rt_expires;
4327 
4328                 write_lock_bh(&ifp->idev->lock);
4329                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4330                 write_unlock_bh(&ifp->idev->lock);
4331 
4332                 if (action != CLEANUP_PREFIX_RT_NOP) {
4333                         cleanup_prefix_route(ifp, rt_expires,
4334                                 action == CLEANUP_PREFIX_RT_DEL);
4335                 }
4336         }
4337 
4338         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4339                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4340                         valid_lft = prefered_lft = 0;
4341                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4342                                  !was_managetempaddr, jiffies);
4343         }
4344 
4345         addrconf_verify_rtnl();
4346 
4347         return 0;
4348 }
4349 
4350 static int
4351 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4352 {
4353         struct net *net = sock_net(skb->sk);
4354         struct ifaddrmsg *ifm;
4355         struct nlattr *tb[IFA_MAX+1];
4356         struct in6_addr *pfx, *peer_pfx;
4357         struct inet6_ifaddr *ifa;
4358         struct net_device *dev;
4359         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4360         u32 ifa_flags;
4361         int err;
4362 
4363         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4364         if (err < 0)
4365                 return err;
4366 
4367         ifm = nlmsg_data(nlh);
4368         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4369         if (!pfx)
4370                 return -EINVAL;
4371 
4372         if (tb[IFA_CACHEINFO]) {
4373                 struct ifa_cacheinfo *ci;
4374 
4375                 ci = nla_data(tb[IFA_CACHEINFO]);
4376                 valid_lft = ci->ifa_valid;
4377                 preferred_lft = ci->ifa_prefered;
4378         } else {
4379                 preferred_lft = INFINITY_LIFE_TIME;
4380                 valid_lft = INFINITY_LIFE_TIME;
4381         }
4382 
4383         dev =  __dev_get_by_index(net, ifm->ifa_index);
4384         if (!dev)
4385                 return -ENODEV;
4386 
4387         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4388 
4389         /* We ignore other flags so far. */
4390         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4391                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4392 
4393         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4394         if (!ifa) {
4395                 /*
4396                  * It would be best to check for !NLM_F_CREATE here but
4397                  * userspace already relies on not having to provide this.
4398                  */
4399                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4400                                       ifm->ifa_prefixlen, ifa_flags,
4401                                       preferred_lft, valid_lft);
4402         }
4403 
4404         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4405             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4406                 err = -EEXIST;
4407         else
4408                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4409 
4410         in6_ifa_put(ifa);
4411 
4412         return err;
4413 }
4414 
4415 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4416                           u8 scope, int ifindex)
4417 {
4418         struct ifaddrmsg *ifm;
4419 
4420         ifm = nlmsg_data(nlh);
4421         ifm->ifa_family = AF_INET6;
4422         ifm->ifa_prefixlen = prefixlen;
4423         ifm->ifa_flags = flags;
4424         ifm->ifa_scope = scope;
4425         ifm->ifa_index = ifindex;
4426 }
4427 
4428 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4429                          unsigned long tstamp, u32 preferred, u32 valid)
4430 {
4431         struct ifa_cacheinfo ci;
4432 
4433         ci.cstamp = cstamp_delta(cstamp);
4434         ci.tstamp = cstamp_delta(tstamp);
4435         ci.ifa_prefered = preferred;
4436         ci.ifa_valid = valid;
4437 
4438         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4439 }
4440 
4441 static inline int rt_scope(int ifa_scope)
4442 {
4443         if (ifa_scope & IFA_HOST)
4444                 return RT_SCOPE_HOST;
4445         else if (ifa_scope & IFA_LINK)
4446                 return RT_SCOPE_LINK;
4447         else if (ifa_scope & IFA_SITE)
4448                 return RT_SCOPE_SITE;
4449         else
4450                 return RT_SCOPE_UNIVERSE;
4451 }
4452 
4453 static inline int inet6_ifaddr_msgsize(void)
4454 {
4455         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4456                + nla_total_size(16) /* IFA_LOCAL */
4457                + nla_total_size(16) /* IFA_ADDRESS */
4458                + nla_total_size(sizeof(struct ifa_cacheinfo))
4459                + nla_total_size(4)  /* IFA_FLAGS */;
4460 }
4461 
4462 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4463                              u32 portid, u32 seq, int event, unsigned int flags)
4464 {
4465         struct nlmsghdr  *nlh;
4466         u32 preferred, valid;
4467 
4468         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4469         if (!nlh)
4470                 return -EMSGSIZE;
4471 
4472         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4473                       ifa->idev->dev->ifindex);
4474 
4475         if (!((ifa->flags&IFA_F_PERMANENT) &&
4476               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4477                 preferred = ifa->prefered_lft;
4478                 valid = ifa->valid_lft;
4479                 if (preferred != INFINITY_LIFE_TIME) {
4480                         long tval = (jiffies - ifa->tstamp)/HZ;
4481                         if (preferred > tval)
4482                                 preferred -= tval;
4483                         else
4484                                 preferred = 0;
4485                         if (valid != INFINITY_LIFE_TIME) {
4486                                 if (valid > tval)
4487                                         valid -= tval;
4488                                 else
4489                                         valid = 0;
4490                         }
4491                 }
4492         } else {
4493                 preferred = INFINITY_LIFE_TIME;
4494                 valid = INFINITY_LIFE_TIME;
4495         }
4496 
4497         if (!ipv6_addr_any(&ifa->peer_addr)) {
4498                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4499                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4500                         goto error;
4501         } else
4502                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4503                         goto error;
4504 
4505         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4506                 goto error;
4507 
4508         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4509                 goto error;
4510 
4511         nlmsg_end(skb, nlh);
4512         return 0;
4513 
4514 error:
4515         nlmsg_cancel(skb, nlh);
4516         return -EMSGSIZE;
4517 }
4518 
4519 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4520                                 u32 portid, u32 seq, int event, u16 flags)
4521 {
4522         struct nlmsghdr  *nlh;
4523         u8 scope = RT_SCOPE_UNIVERSE;
4524         int ifindex = ifmca->idev->dev->ifindex;
4525 
4526         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4527                 scope = RT_SCOPE_SITE;
4528 
4529         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4530         if (!nlh)
4531                 return -EMSGSIZE;
4532 
4533         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4534         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4535             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4536                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4537                 nlmsg_cancel(skb, nlh);
4538                 return -EMSGSIZE;
4539         }
4540 
4541         nlmsg_end(skb, nlh);
4542         return 0;
4543 }
4544 
4545 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4546                                 u32 portid, u32 seq, int event, unsigned int flags)
4547 {
4548         struct nlmsghdr  *nlh;
4549         u8 scope = RT_SCOPE_UNIVERSE;
4550         int ifindex = ifaca->aca_idev->dev->ifindex;
4551 
4552         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4553                 scope = RT_SCOPE_SITE;
4554 
4555         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4556         if (!nlh)
4557                 return -EMSGSIZE;
4558 
4559         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4560         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4561             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4562                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4563                 nlmsg_cancel(skb, nlh);
4564                 return -EMSGSIZE;
4565         }
4566 
4567         nlmsg_end(skb, nlh);
4568         return 0;
4569 }
4570 
4571 enum addr_type_t {
4572         UNICAST_ADDR,
4573         MULTICAST_ADDR,
4574         ANYCAST_ADDR,
4575 };
4576 
4577 /* called with rcu_read_lock() */
4578 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4579                           struct netlink_callback *cb, enum addr_type_t type,
4580                           int s_ip_idx, int *p_ip_idx)
4581 {
4582         struct ifmcaddr6 *ifmca;
4583         struct ifacaddr6 *ifaca;
4584         int err = 1;
4585         int ip_idx = *p_ip_idx;
4586 
4587         read_lock_bh(&idev->lock);
4588         switch (type) {
4589         case UNICAST_ADDR: {
4590                 struct inet6_ifaddr *ifa;
4591 
4592                 /* unicast address incl. temp addr */
4593                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4594                         if (++ip_idx < s_ip_idx)
4595                                 continue;
4596                         err = inet6_fill_ifaddr(skb, ifa,
4597                                                 NETLINK_CB(cb->skb).portid,
4598                                                 cb->nlh->nlmsg_seq,
4599                                                 RTM_NEWADDR,
4600                                                 NLM_F_MULTI);
4601                         if (err < 0)
4602                                 break;
4603                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4604                 }
4605                 break;
4606         }
4607         case MULTICAST_ADDR:
4608                 /* multicast address */
4609                 for (ifmca = idev->mc_list; ifmca;
4610                      ifmca = ifmca->next, ip_idx++) {
4611                         if (ip_idx < s_ip_idx)
4612                                 continue;
4613                         err = inet6_fill_ifmcaddr(skb, ifmca,
4614                                                   NETLINK_CB(cb->skb).portid,
4615                                                   cb->nlh->nlmsg_seq,
4616                                                   RTM_GETMULTICAST,
4617                                                   NLM_F_MULTI);
4618                         if (err < 0)
4619                                 break;
4620                 }
4621                 break;
4622         case ANYCAST_ADDR:
4623                 /* anycast address */
4624                 for (ifaca = idev->ac_list; ifaca;
4625                      ifaca = ifaca->aca_next, ip_idx++) {
4626                         if (ip_idx < s_ip_idx)
4627                                 continue;
4628                         err = inet6_fill_ifacaddr(skb, ifaca,
4629                                                   NETLINK_CB(cb->skb).portid,
4630                                                   cb->nlh->nlmsg_seq,
4631                                                   RTM_GETANYCAST,
4632                                                   NLM_F_MULTI);
4633                         if (err < 0)
4634                                 break;
4635                 }
4636                 break;
4637         default:
4638                 break;
4639         }
4640         read_unlock_bh(&idev->lock);
4641         *p_ip_idx = ip_idx;
4642         return err;
4643 }
4644 
4645 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4646                            enum addr_type_t type)
4647 {
4648         struct net *net = sock_net(skb->sk);
4649         int h, s_h;
4650         int idx, ip_idx;
4651         int s_idx, s_ip_idx;
4652         struct net_device *dev;
4653         struct inet6_dev *idev;
4654         struct hlist_head *head;
4655 
4656         s_h = cb->args[0];
4657         s_idx = idx = cb->args[1];
4658         s_ip_idx = ip_idx = cb->args[2];
4659 
4660         rcu_read_lock();
4661         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4662         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4663                 idx = 0;
4664                 head = &net->dev_index_head[h];
4665                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4666                         if (idx < s_idx)
4667                                 goto cont;
4668                         if (h > s_h || idx > s_idx)
4669                                 s_ip_idx = 0;
4670                         ip_idx = 0;
4671                         idev = __in6_dev_get(dev);
4672                         if (!idev)
4673                                 goto cont;
4674 
4675                         if (in6_dump_addrs(idev, skb, cb, type,
4676                                            s_ip_idx, &ip_idx) < 0)
4677                                 goto done;
4678 cont:
4679                         idx++;
4680                 }
4681         }
4682 done:
4683         rcu_read_unlock();
4684         cb->args[0] = h;
4685         cb->args[1] = idx;
4686         cb->args[2] = ip_idx;
4687 
4688         return skb->len;
4689 }
4690 
4691 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4692 {
4693         enum addr_type_t type = UNICAST_ADDR;
4694 
4695         return inet6_dump_addr(skb, cb, type);
4696 }
4697 
4698 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4699 {
4700         enum addr_type_t type = MULTICAST_ADDR;
4701 
4702         return inet6_dump_addr(skb, cb, type);
4703 }
4704 
4705 
4706 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4707 {
4708         enum addr_type_t type = ANYCAST_ADDR;
4709 
4710         return inet6_dump_addr(skb, cb, type);
4711 }
4712 
4713 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4714 {
4715         struct net *net = sock_net(in_skb->sk);
4716         struct ifaddrmsg *ifm;
4717         struct nlattr *tb[IFA_MAX+1];
4718         struct in6_addr *addr = NULL, *peer;
4719         struct net_device *dev = NULL;
4720         struct inet6_ifaddr *ifa;
4721         struct sk_buff *skb;
4722         int err;
4723 
4724         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4725         if (err < 0)
4726                 goto errout;
4727 
4728         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4729         if (!addr) {
4730                 err = -EINVAL;
4731                 goto errout;
4732         }
4733 
4734         ifm = nlmsg_data(nlh);
4735         if (ifm->ifa_index)
4736                 dev = __dev_get_by_index(net, ifm->ifa_index);
4737 
4738         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4739         if (!ifa) {
4740                 err = -EADDRNOTAVAIL;
4741                 goto errout;
4742         }
4743 
4744         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4745         if (!skb) {
4746                 err = -ENOBUFS;
4747                 goto errout_ifa;
4748         }
4749 
4750         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4751                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4752         if (err < 0) {
4753                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4754                 WARN_ON(err == -EMSGSIZE);
4755                 kfree_skb(skb);
4756                 goto errout_ifa;
4757         }
4758         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4759 errout_ifa:
4760         in6_ifa_put(ifa);
4761 errout:
4762         return err;
4763 }
4764 
4765 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4766 {
4767         struct sk_buff *skb;
4768         struct net *net = dev_net(ifa->idev->dev);
4769         int err = -ENOBUFS;
4770 
4771         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4772         if (!skb)
4773                 goto errout;
4774 
4775         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4776         if (err < 0) {
4777                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4778                 WARN_ON(err == -EMSGSIZE);
4779                 kfree_skb(skb);
4780                 goto errout;
4781         }
4782         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4783         return;
4784 errout:
4785         if (err < 0)
4786                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4787 }
4788 
4789 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4790                                 __s32 *array, int bytes)
4791 {
4792         BUG_ON(bytes < (DEVCONF_MAX * 4));
4793 
4794         memset(array, 0, bytes);
4795         array[DEVCONF_FORWARDING] = cnf->forwarding;
4796         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4797         array[DEVCONF_MTU6] = cnf->mtu6;
4798         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4799         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4800         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4801         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4802         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4803         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4804                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4805         array[DEVCONF_RTR_SOLICIT_DELAY] =
4806                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4807         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4808         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4809                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4810         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4811                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4812         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4813         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4814         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4815         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4816         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4817         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4818         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4819         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4820         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4821 #ifdef CONFIG_IPV6_ROUTER_PREF
4822         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4823         array[DEVCONF_RTR_PROBE_INTERVAL] =
4824                 jiffies_to_msecs(cnf->rtr_probe_interval);
4825 #ifdef CONFIG_IPV6_ROUTE_INFO
4826         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4827 #endif
4828 #endif
4829         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4830         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4831 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4832         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4833         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4834 #endif
4835 #ifdef CONFIG_IPV6_MROUTE
4836         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4837 #endif
4838         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4839         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4840         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4841         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4842         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4843         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4844         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4845         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4846         /* we omit DEVCONF_STABLE_SECRET for now */
4847         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4848         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4849         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4850         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4851 }
4852 
4853 static inline size_t inet6_ifla6_size(void)
4854 {
4855         return nla_total_size(4) /* IFLA_INET6_FLAGS */
4856              + nla_total_size(sizeof(struct ifla_cacheinfo))
4857              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4858              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4859              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4860              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4861 }
4862 
4863 static inline size_t inet6_if_nlmsg_size(void)
4864 {
4865         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4866                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4867                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4868                + nla_total_size(4) /* IFLA_MTU */
4869                + nla_total_size(4) /* IFLA_LINK */
4870                + nla_total_size(1) /* IFLA_OPERSTATE */
4871                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4872 }
4873 
4874 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4875                                       int items, int bytes)
4876 {
4877         int i;
4878         int pad = bytes - sizeof(u64) * items;
4879         BUG_ON(pad < 0);
4880 
4881         /* Use put_unaligned() because stats may not be aligned for u64. */
4882         put_unaligned(items, &stats[0]);
4883         for (i = 1; i < items; i++)
4884                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4885 
4886         memset(&stats[items], 0, pad);
4887 }
4888 
4889 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4890                                         int bytes, size_t syncpoff)
4891 {
4892         int i, c;
4893         u64 buff[IPSTATS_MIB_MAX];
4894         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4895 
4896         BUG_ON(pad < 0);
4897 
4898         memset(buff, 0, sizeof(buff));
4899         buff[0] = IPSTATS_MIB_MAX;
4900 
4901         for_each_possible_cpu(c) {
4902                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4903                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4904         }
4905 
4906         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4907         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4908 }
4909 
4910 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4911                              int bytes)
4912 {
4913         switch (attrtype) {
4914         case IFLA_INET6_STATS:
4915                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4916                                      offsetof(struct ipstats_mib, syncp));
4917                 break;
4918         case IFLA_INET6_ICMP6STATS:
4919                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4920                 break;
4921         }
4922 }
4923 
4924 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4925                                   u32 ext_filter_mask)
4926 {
4927         struct nlattr *nla;
4928         struct ifla_cacheinfo ci;
4929 
4930         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4931                 goto nla_put_failure;
4932         ci.max_reasm_len = IPV6_MAXPLEN;
4933         ci.tstamp = cstamp_delta(idev->tstamp);
4934         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4935         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4936         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4937                 goto nla_put_failure;
4938         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4939         if (!nla)
4940                 goto nla_put_failure;
4941         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4942 
4943         /* XXX - MC not implemented */
4944 
4945         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4946                 return 0;
4947 
4948         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4949         if (!nla)
4950                 goto nla_put_failure;
4951         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4952 
4953         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4954         if (!nla)
4955                 goto nla_put_failure;
4956         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4957 
4958         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4959         if (!nla)
4960                 goto nla_put_failure;
4961 
4962         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4963                 goto nla_put_failure;
4964 
4965         read_lock_bh(&idev->lock);
4966         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4967         read_unlock_bh(&idev->lock);
4968 
4969         return 0;
4970 
4971 nla_put_failure:
4972         return -EMSGSIZE;
4973 }
4974 
4975 static size_t inet6_get_link_af_size(const struct net_device *dev,
4976                                      u32 ext_filter_mask)
4977 {
4978         if (!__in6_dev_get(dev))
4979                 return 0;
4980 
4981         return inet6_ifla6_size();
4982 }
4983 
4984 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4985                               u32 ext_filter_mask)
4986 {
4987         struct inet6_dev *idev = __in6_dev_get(dev);
4988 
4989         if (!idev)
4990                 return -ENODATA;
4991 
4992         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4993                 return -EMSGSIZE;
4994 
4995         return 0;
4996 }
4997 
4998 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4999 {
5000         struct inet6_ifaddr *ifp;
5001         struct net_device *dev = idev->dev;
5002         bool update_rs = false;
5003         struct in6_addr ll_addr;
5004 
5005         ASSERT_RTNL();
5006 
5007         if (!token)
5008                 return -EINVAL;
5009         if (ipv6_addr_any(token))
5010                 return -EINVAL;
5011         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5012                 return -EINVAL;
5013         if (!ipv6_accept_ra(idev))
5014                 return -EINVAL;
5015         if (idev->cnf.rtr_solicits <= 0)
5016                 return -EINVAL;
5017 
5018         write_lock_bh(&idev->lock);
5019 
5020         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5021         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5022 
5023         write_unlock_bh(&idev->lock);
5024 
5025         if (!idev->dead && (idev->if_flags & IF_READY) &&
5026             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5027                              IFA_F_OPTIMISTIC)) {
5028 
5029                 /* If we're not ready, then normal ifup will take care
5030                  * of this. Otherwise, we need to request our rs here.
5031                  */
5032                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5033                 update_rs = true;
5034         }
5035 
5036         write_lock_bh(&idev->lock);
5037 
5038         if (update_rs) {
5039                 idev->if_flags |= IF_RS_SENT;
5040                 idev->rs_probes = 1;
5041                 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
5042         }
5043 
5044         /* Well, that's kinda nasty ... */
5045         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5046                 spin_lock(&ifp->lock);
5047                 if (ifp->tokenized) {
5048                         ifp->valid_lft = 0;
5049                         ifp->prefered_lft = 0;
5050                 }
5051                 spin_unlock(&ifp->lock);
5052         }
5053 
5054         write_unlock_bh(&idev->lock);
5055         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5056         addrconf_verify_rtnl();
5057         return 0;
5058 }
5059 
5060 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5061         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5062         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5063 };
5064 
5065 static int inet6_validate_link_af(const struct net_device *dev,
5066                                   const struct nlattr *nla)
5067 {
5068         struct nlattr *tb[IFLA_INET6_MAX + 1];
5069 
5070         if (dev && !__in6_dev_get(dev))
5071                 return -EAFNOSUPPORT;
5072 
5073         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5074 }
5075 
5076 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5077 {
5078         int err = -EINVAL;
5079         struct inet6_dev *idev = __in6_dev_get(dev);
5080         struct nlattr *tb[IFLA_INET6_MAX + 1];
5081 
5082         if (!idev)
5083                 return -EAFNOSUPPORT;
5084 
5085         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5086                 BUG();
5087 
5088         if (tb[IFLA_INET6_TOKEN]) {
5089                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5090                 if (err)
5091                         return err;
5092         }
5093 
5094         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5095                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5096 
5097                 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5098                     mode != IN6_ADDR_GEN_MODE_NONE &&
5099                     mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5100                     mode != IN6_ADDR_GEN_MODE_RANDOM)
5101                         return -EINVAL;
5102 
5103                 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5104                     !idev->cnf.stable_secret.initialized &&
5105                     !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5106                         return -EINVAL;
5107 
5108                 idev->addr_gen_mode = mode;
5109                 err = 0;
5110         }
5111 
5112         return err;
5113 }
5114 
5115 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5116                              u32 portid, u32 seq, int event, unsigned int flags)
5117 {
5118         struct net_device *dev = idev->dev;
5119         struct ifinfomsg *hdr;
5120         struct nlmsghdr *nlh;
5121         void *protoinfo;
5122 
5123         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5124         if (!nlh)
5125                 return -EMSGSIZE;
5126 
5127         hdr = nlmsg_data(nlh);
5128         hdr->ifi_family = AF_INET6;
5129         hdr->__ifi_pad = 0;
5130         hdr->ifi_type = dev->type;
5131         hdr->ifi_index = dev->ifindex;
5132         hdr->ifi_flags = dev_get_flags(dev);
5133         hdr->ifi_change = 0;
5134 
5135         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5136             (dev->addr_len &&
5137              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5138             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5139             (dev->ifindex != dev_get_iflink(dev) &&
5140              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5141             nla_put_u8(skb, IFLA_OPERSTATE,
5142                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5143                 goto nla_put_failure;
5144         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5145         if (!protoinfo)
5146                 goto nla_put_failure;
5147 
5148         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5149                 goto nla_put_failure;
5150 
5151         nla_nest_end(skb, protoinfo);
5152         nlmsg_end(skb, nlh);
5153         return 0;
5154 
5155 nla_put_failure:
5156         nlmsg_cancel(skb, nlh);
5157         return -EMSGSIZE;
5158 }
5159 
5160 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5161 {
5162         struct net *net = sock_net(skb->sk);
5163         int h, s_h;
5164         int idx = 0, s_idx;
5165         struct net_device *dev;
5166         struct inet6_dev *idev;
5167         struct hlist_head *head;
5168 
5169         s_h = cb->args[0];
5170         s_idx = cb->args[1];
5171 
5172         rcu_read_lock();
5173         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5174                 idx = 0;
5175                 head = &net->dev_index_head[h];
5176                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5177                         if (idx < s_idx)
5178                                 goto cont;
5179                         idev = __in6_dev_get(dev);
5180                         if (!idev)
5181                                 goto cont;
5182                         if (inet6_fill_ifinfo(skb, idev,
5183                                               NETLINK_CB(cb->skb).portid,
5184                                               cb->nlh->nlmsg_seq,
5185                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5186                                 goto out;
5187 cont:
5188                         idx++;
5189                 }
5190         }
5191 out:
5192         rcu_read_unlock();
5193         cb->args[1] = idx;
5194         cb->args[0] = h;
5195 
5196         return skb->len;
5197 }
5198 
5199 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5200 {
5201         struct sk_buff *skb;
5202         struct net *net = dev_net(idev->dev);
5203         int err = -ENOBUFS;
5204 
5205         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5206         if (!skb)
5207                 goto errout;
5208 
5209         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5210         if (err < 0) {
5211                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5212                 WARN_ON(err == -EMSGSIZE);
5213                 kfree_skb(skb);
5214                 goto errout;
5215         }
5216         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5217         return;
5218 errout:
5219         if (err < 0)
5220                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5221 }
5222 
5223 static inline size_t inet6_prefix_nlmsg_size(void)
5224 {
5225         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5226                + nla_total_size(sizeof(struct in6_addr))
5227                + nla_total_size(sizeof(struct prefix_cacheinfo));
5228 }
5229 
5230 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5231                              struct prefix_info *pinfo, u32 portid, u32 seq,
5232                              int event, unsigned int flags)
5233 {
5234         struct prefixmsg *pmsg;
5235         struct nlmsghdr *nlh;
5236         struct prefix_cacheinfo ci;
5237 
5238         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5239         if (!nlh)
5240                 return -EMSGSIZE;
5241 
5242         pmsg = nlmsg_data(nlh);
5243         pmsg->prefix_family = AF_INET6;
5244         pmsg->prefix_pad1 = 0;
5245         pmsg->prefix_pad2 = 0;
5246         pmsg->prefix_ifindex = idev->dev->ifindex;
5247         pmsg->prefix_len = pinfo->prefix_len;
5248         pmsg->prefix_type = pinfo->type;
5249         pmsg->prefix_pad3 = 0;
5250         pmsg->prefix_flags = 0;
5251         if (pinfo->onlink)
5252                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5253         if (pinfo->autoconf)
5254                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5255 
5256         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5257                 goto nla_put_failure;
5258         ci.preferred_time = ntohl(pinfo->prefered);
5259         ci.valid_time = ntohl(pinfo->valid);
5260         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5261                 goto nla_put_failure;
5262         nlmsg_end(skb, nlh);
5263         return 0;
5264 
5265 nla_put_failure:
5266         nlmsg_cancel(skb, nlh);
5267         return -EMSGSIZE;
5268 }
5269 
5270 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5271                          struct prefix_info *pinfo)
5272 {
5273         struct sk_buff *skb;
5274         struct net *net = dev_net(idev->dev);
5275         int err = -ENOBUFS;
5276 
5277         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5278         if (!skb)
5279                 goto errout;
5280 
5281         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5282         if (err < 0) {
5283                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5284                 WARN_ON(err == -EMSGSIZE);
5285                 kfree_skb(skb);
5286                 goto errout;
5287         }
5288         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5289         return;
5290 errout:
5291         if (err < 0)
5292                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5293 }
5294 
5295 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5296 {
5297         struct net *net = dev_net(ifp->idev->dev);
5298 
5299         if (event)
5300                 ASSERT_RTNL();
5301 
5302         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5303 
5304         switch (event) {
5305         case RTM_NEWADDR:
5306                 /*
5307                  * If the address was optimistic
5308                  * we inserted the route at the start of
5309                  * our DAD process, so we don't need
5310                  * to do it again
5311                  */
5312                 if (!(ifp->rt->rt6i_node))
5313                         ip6_ins_rt(ifp->rt);
5314                 if (ifp->idev->cnf.forwarding)
5315                         addrconf_join_anycast(ifp);
5316                 if (!ipv6_addr_any(&ifp->peer_addr))
5317                         addrconf_prefix_route(&ifp->peer_addr, 128,
5318                                               ifp->idev->dev, 0, 0);
5319                 break;
5320         case RTM_DELADDR:
5321                 if (ifp->idev->cnf.forwarding)
5322                         addrconf_leave_anycast(ifp);
5323                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5324                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5325                         struct rt6_info *rt;
5326 
5327                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5328                                                        ifp->idev->dev, 0, 0);
5329                         if (rt)
5330                                 ip6_del_rt(rt);
5331                 }
5332                 if (ifp->rt) {
5333                         dst_hold(&ifp->rt->dst);
5334                         ip6_del_rt(ifp->rt);
5335                 }
5336                 rt_genid_bump_ipv6(net);
5337                 break;
5338         }
5339         atomic_inc(&net->ipv6.dev_addr_genid);
5340 }
5341 
5342 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5343 {
5344         rcu_read_lock_bh();
5345         if (likely(ifp->idev->dead == 0))
5346                 __ipv6_ifa_notify(event, ifp);
5347         rcu_read_unlock_bh();
5348 }
5349 
5350 #ifdef CONFIG_SYSCTL
5351 
5352 static
5353 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5354                            void __user *buffer, size_t *lenp, loff_t *ppos)
5355 {
5356         int *valp = ctl->data;
5357         int val = *valp;
5358         loff_t pos = *ppos;
5359         struct ctl_table lctl;
5360         int ret;
5361 
5362         /*
5363          * ctl->data points to idev->cnf.forwarding, we should
5364          * not modify it until we get the rtnl lock.
5365          */
5366         lctl = *ctl;
5367         lctl.data = &val;
5368 
5369         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5370 
5371         if (write)
5372                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5373         if (ret)
5374                 *ppos = pos;
5375         return ret;
5376 }
5377 
5378 static
5379 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5380                               void __user *buffer, size_t *lenp, loff_t *ppos)
5381 {
5382         struct ctl_table lctl;
5383         int min_hl = 1, max_hl = 255;
5384 
5385         lctl = *ctl;
5386         lctl.extra1 = &min_hl;
5387         lctl.extra2 = &max_hl;
5388 
5389         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5390 }
5391 
5392 static
5393 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5394                         void __user *buffer, size_t *lenp, loff_t *ppos)
5395 {
5396         struct inet6_dev *idev = ctl->extra1;
5397         int min_mtu = IPV6_MIN_MTU;
5398         struct ctl_table lctl;
5399 
5400         lctl = *ctl;
5401         lctl.extra1 = &min_mtu;
5402         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5403 
5404         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5405 }
5406 
5407 static void dev_disable_change(struct inet6_dev *idev)
5408 {
5409         struct netdev_notifier_info info;
5410 
5411         if (!idev || !idev->dev)
5412                 return;
5413 
5414         netdev_notifier_info_init(&info, idev->dev);
5415         if (idev->cnf.disable_ipv6)
5416                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5417         else
5418                 addrconf_notify(NULL, NETDEV_UP, &info);
5419 }
5420 
5421 static void addrconf_disable_change(struct net *net, __s32 newf)
5422 {
5423         struct net_device *dev;
5424         struct inet6_dev *idev;
5425 
5426         rcu_read_lock();
5427         for_each_netdev_rcu(net, dev) {
5428                 idev = __in6_dev_get(dev);
5429                 if (idev) {
5430                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5431                         idev->cnf.disable_ipv6 = newf;
5432                         if (changed)
5433                                 dev_disable_change(idev);
5434                 }
5435         }
5436         rcu_read_unlock();
5437 }
5438 
5439 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5440 {
5441         struct net *net;
5442         int old;
5443 
5444         if (!rtnl_trylock())
5445                 return restart_syscall();
5446 
5447         net = (struct net *)table->extra2;
5448         old = *p;
5449         *p = newf;
5450 
5451         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5452                 rtnl_unlock();
5453                 return 0;
5454         }
5455 
5456         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5457                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5458                 addrconf_disable_change(net, newf);
5459         } else if ((!newf) ^ (!old))
5460                 dev_disable_change((struct inet6_dev *)table->extra1);
5461 
5462         rtnl_unlock();
5463         return 0;
5464 }
5465 
5466 static
5467 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5468                             void __user *buffer, size_t *lenp, loff_t *ppos)
5469 {
5470         int *valp = ctl->data;
5471         int val = *valp;
5472         loff_t pos = *ppos;
5473         struct ctl_table lctl;
5474         int ret;
5475 
5476         /*
5477          * ctl->data points to idev->cnf.disable_ipv6, we should
5478          * not modify it until we get the rtnl lock.
5479          */
5480         lctl = *ctl;
5481         lctl.data = &val;
5482 
5483         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5484 
5485         if (write)
5486                 ret = addrconf_disable_ipv6(ctl, valp, val);
5487         if (ret)
5488                 *ppos = pos;
5489         return ret;
5490 }
5491 
5492 static
5493 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5494                               void __user *buffer, size_t *lenp, loff_t *ppos)
5495 {
5496         int *valp = ctl->data;
5497         int ret;
5498         int old, new;
5499 
5500         old = *valp;
5501         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5502         new = *valp;
5503 
5504         if (write && old != new) {
5505                 struct net *net = ctl->extra2;
5506 
5507                 if (!rtnl_trylock())
5508                         return restart_syscall();
5509 
5510                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5511                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5512                                                      NETCONFA_IFINDEX_DEFAULT,
5513                                                      net->ipv6.devconf_dflt);
5514                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5515                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5516                                                      NETCONFA_IFINDEX_ALL,
5517                                                      net->ipv6.devconf_all);
5518                 else {
5519                         struct inet6_dev *idev = ctl->extra1;
5520 
5521                         inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5522                                                      idev->dev->ifindex,
5523                                                      &idev->cnf);
5524                 }
5525                 rtnl_unlock();
5526         }
5527 
5528         return ret;
5529 }
5530 
5531 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5532                                          void __user *buffer, size_t *lenp,
5533                                          loff_t *ppos)
5534 {
5535         int err;
5536         struct in6_addr addr;
5537         char str[IPV6_MAX_STRLEN];
5538         struct ctl_table lctl = *ctl;
5539         struct net *net = ctl->extra2;
5540         struct ipv6_stable_secret *secret = ctl->data;
5541 
5542         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5543                 return -EIO;
5544 
5545         lctl.maxlen = IPV6_MAX_STRLEN;
5546         lctl.data = str;
5547 
5548         if (!rtnl_trylock())
5549                 return restart_syscall();
5550 
5551         if (!write && !secret->initialized) {
5552                 err = -EIO;
5553                 goto out;
5554         }
5555 
5556         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5557         if (err >= sizeof(str)) {
5558                 err = -EIO;
5559                 goto out;
5560         }
5561 
5562         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5563         if (err || !write)
5564                 goto out;
5565 
5566         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5567                 err = -EIO;
5568                 goto out;
5569         }
5570 
5571         secret->initialized = true;
5572         secret->secret = addr;
5573 
5574         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5575                 struct net_device *dev;
5576 
5577                 for_each_netdev(net, dev) {
5578                         struct inet6_dev *idev = __in6_dev_get(dev);
5579 
5580                         if (idev) {
5581                                 idev->addr_gen_mode =
5582                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5583                         }
5584                 }
5585         } else {
5586                 struct inet6_dev *idev = ctl->extra1;
5587 
5588                 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5589         }
5590 
5591 out:
5592         rtnl_unlock();
5593 
5594         return err;
5595 }
5596 
5597 static
5598 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5599                                                 int write,
5600                                                 void __user *buffer,
5601                                                 size_t *lenp,
5602                                                 loff_t *ppos)
5603 {
5604         int *valp = ctl->data;
5605         int val = *valp;
5606         loff_t pos = *ppos;
5607         struct ctl_table lctl;
5608         int ret;
5609 
5610         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5611          * we should not modify it until we get the rtnl lock.
5612          */
5613         lctl = *ctl;
5614         lctl.data = &val;
5615 
5616         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5617 
5618         if (write)
5619                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5620         if (ret)
5621                 *ppos = pos;
5622         return ret;
5623 }
5624 
5625 static struct addrconf_sysctl_table
5626 {
5627         struct ctl_table_header *sysctl_header;
5628         struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5629 } addrconf_sysctl __read_mostly = {
5630         .sysctl_header = NULL,
5631         .addrconf_vars = {
5632                 {
5633                         .procname       = "forwarding",
5634                         .data           = &ipv6_devconf.forwarding,
5635                         .maxlen         = sizeof(int),
5636                         .mode           = 0644,
5637                         .proc_handler   = addrconf_sysctl_forward,
5638                 },
5639                 {
5640                         .procname       = "hop_limit",
5641                         .data           = &ipv6_devconf.hop_limit,
5642                         .maxlen         = sizeof(int),
5643                         .mode           = 0644,
5644                         .proc_handler   = addrconf_sysctl_hop_limit,
5645                 },
5646                 {
5647                         .procname       = "mtu",
5648                         .data           = &ipv6_devconf.mtu6,
5649                         .maxlen         = sizeof(int),
5650                         .mode           = 0644,
5651                         .proc_handler   = addrconf_sysctl_mtu,
5652                 },
5653                 {
5654                         .procname       = "accept_ra",
5655                         .data           = &ipv6_devconf.accept_ra,
5656                         .maxlen         = sizeof(int),
5657                         .mode           = 0644,
5658                         .proc_handler   = proc_dointvec,
5659                 },
5660                 {
5661                         .procname       = "accept_redirects",
5662                         .data           = &ipv6_devconf.accept_redirects,
5663                         .maxlen         = sizeof(int),
5664                         .mode           = 0644,
5665                         .proc_handler   = proc_dointvec,
5666                 },
5667                 {
5668                         .procname       = "autoconf",
5669                         .data           = &ipv6_devconf.autoconf,
5670                         .maxlen         = sizeof(int),
5671                         .mode           = 0644,
5672                         .proc_handler   = proc_dointvec,
5673                 },
5674                 {
5675                         .procname       = "dad_transmits",
5676                         .data           = &ipv6_devconf.dad_transmits,
5677                         .maxlen         = sizeof(int),
5678                         .mode           = 0644,
5679                         .proc_handler   = proc_dointvec,
5680                 },
5681                 {
5682                         .procname       = "router_solicitations",
5683                         .data           = &ipv6_devconf.rtr_solicits,
5684                         .maxlen         = sizeof(int),
5685                         .mode           = 0644,
5686                         .proc_handler   = proc_dointvec,
5687                 },
5688                 {
5689                         .procname       = "router_solicitation_interval",
5690                         .data           = &ipv6_devconf.rtr_solicit_interval,
5691                         .maxlen         = sizeof(int),
5692                         .mode           = 0644,
5693                         .proc_handler   = proc_dointvec_jiffies,
5694                 },
5695                 {
5696                         .procname       = "router_solicitation_delay",
5697                         .data           = &ipv6_devconf.rtr_solicit_delay,
5698                         .maxlen         = sizeof(int),
5699                         .mode           = 0644,
5700                         .proc_handler   = proc_dointvec_jiffies,
5701                 },
5702                 {
5703                         .procname       = "force_mld_version",
5704                         .data           = &ipv6_devconf.force_mld_version,
5705                         .maxlen         = sizeof(int),
5706                         .mode           = 0644,
5707                         .proc_handler   = proc_dointvec,
5708                 },
5709                 {
5710                         .procname       = "mldv1_unsolicited_report_interval",
5711                         .data           =
5712                                 &ipv6_devconf.mldv1_unsolicited_report_interval,
5713                         .maxlen         = sizeof(int),
5714                         .mode           = 0644,
5715                         .proc_handler   = proc_dointvec_ms_jiffies,
5716                 },
5717                 {
5718                         .procname       = "mldv2_unsolicited_report_interval",
5719                         .data           =
5720                                 &ipv6_devconf.mldv2_unsolicited_report_interval,
5721                         .maxlen         = sizeof(int),
5722                         .mode           = 0644,
5723                         .proc_handler   = proc_dointvec_ms_jiffies,
5724                 },
5725                 {
5726                         .procname       = "use_tempaddr",
5727                         .data           = &ipv6_devconf.use_tempaddr,
5728                         .maxlen         = sizeof(int),
5729                         .mode           = 0644,
5730                         .proc_handler   = proc_dointvec,
5731                 },
5732                 {
5733                         .procname       = "temp_valid_lft",
5734                         .data           = &ipv6_devconf.temp_valid_lft,
5735                         .maxlen         = sizeof(int),
5736                         .mode           = 0644,
5737                         .proc_handler   = proc_dointvec,
5738                 },
5739                 {
5740                         .procname       = "temp_prefered_lft",
5741                         .data           = &ipv6_devconf.temp_prefered_lft,
5742                         .maxlen         = sizeof(int),
5743                         .mode           = 0644,
5744                         .proc_handler   = proc_dointvec,
5745                 },
5746                 {
5747                         .procname       = "regen_max_retry",
5748                         .data           = &ipv6_devconf.regen_max_retry,
5749                         .maxlen         = sizeof(int),
5750                         .mode           = 0644,
5751                         .proc_handler   = proc_dointvec,
5752                 },
5753                 {
5754                         .procname       = "max_desync_factor",
5755                         .data           = &ipv6_devconf.max_desync_factor,
5756                         .maxlen         = sizeof(int),
5757                         .mode           = 0644,
5758                         .proc_handler   = proc_dointvec,
5759                 },
5760                 {
5761                         .procname       = "max_addresses",
5762                         .data           = &ipv6_devconf.max_addresses,
5763                         .maxlen         = sizeof(int),
5764                         .mode           = 0644,
5765                         .proc_handler   = proc_dointvec,
5766                 },
5767                 {
5768                         .procname       = "accept_ra_defrtr",
5769                         .data           = &ipv6_devconf.accept_ra_defrtr,
5770                         .maxlen         = sizeof(int),
5771                         .mode           = 0644,
5772                         .proc_handler   = proc_dointvec,
5773                 },
5774                 {
5775                         .procname       = "accept_ra_min_hop_limit",
5776                         .data           = &ipv6_devconf.accept_ra_min_hop_limit,
5777                         .maxlen         = sizeof(int),
5778                         .mode           = 0644,
5779                         .proc_handler   = proc_dointvec,
5780                 },
5781                 {
5782                         .procname       = "accept_ra_pinfo",
5783                         .data           = &ipv6_devconf.accept_ra_pinfo,
5784                         .maxlen         = sizeof(int),
5785                         .mode           = 0644,
5786                         .proc_handler   = proc_dointvec,
5787                 },
5788 #ifdef CONFIG_IPV6_ROUTER_PREF
5789                 {
5790                         .procname       = "accept_ra_rtr_pref",
5791                         .data           = &ipv6_devconf.accept_ra_rtr_pref,
5792                         .maxlen         = sizeof(int),
5793                         .mode           = 0644,
5794                         .proc_handler   = proc_dointvec,
5795                 },
5796                 {
5797                         .procname       = "router_probe_interval",
5798                         .data           = &ipv6_devconf.rtr_probe_interval,
5799                         .maxlen         = sizeof(int),
5800                         .mode           = 0644,
5801                         .proc_handler   = proc_dointvec_jiffies,
5802                 },
5803 #ifdef CONFIG_IPV6_ROUTE_INFO
5804                 {
5805                         .procname       = "accept_ra_rt_info_max_plen",
5806                         .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
5807                         .maxlen         = sizeof(int),
5808                         .mode           = 0644,
5809                         .proc_handler   = proc_dointvec,
5810                 },
5811 #endif
5812 #endif
5813                 {
5814                         .procname       = "proxy_ndp",
5815                         .data           = &ipv6_devconf.proxy_ndp,
5816                         .maxlen         = sizeof(int),
5817                         .mode           = 0644,
5818                         .proc_handler   = addrconf_sysctl_proxy_ndp,
5819                 },
5820                 {
5821                         .procname       = "accept_source_route",
5822                         .data           = &ipv6_devconf.accept_source_route,
5823                         .maxlen         = sizeof(int),
5824                         .mode           = 0644,
5825                         .proc_handler   = proc_dointvec,
5826                 },
5827 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5828                 {
5829                         .procname       = "optimistic_dad",
5830                         .data           = &ipv6_devconf.optimistic_dad,
5831                         .maxlen         = sizeof(int),
5832                         .mode           = 0644,
5833                         .proc_handler   = proc_dointvec,
5834 
5835                 },
5836                 {
5837                         .procname       = "use_optimistic",
5838                         .data           = &ipv6_devconf.use_optimistic,
5839                         .maxlen         = sizeof(int),
5840                         .mode           = 0644,
5841                         .proc_handler   = proc_dointvec,
5842 
5843                 },
5844 #endif
5845 #ifdef CONFIG_IPV6_MROUTE
5846                 {
5847                         .procname       = "mc_forwarding",
5848                         .data           = &ipv6_devconf.mc_forwarding,
5849                         .maxlen         = sizeof(int),
5850                         .mode           = 0444,
5851                         .proc_handler   = proc_dointvec,
5852                 },
5853 #endif
5854                 {
5855                         .procname       = "disable_ipv6",
5856                         .data           = &ipv6_devconf.disable_ipv6,
5857                         .maxlen         = sizeof(int),
5858                         .mode           = 0644,
5859                         .proc_handler   = addrconf_sysctl_disable,
5860                 },
5861                 {
5862                         .procname       = "accept_dad",
5863                         .data           = &ipv6_devconf.accept_dad,
5864                         .maxlen         = sizeof(int),
5865                         .mode           = 0644,
5866                         .proc_handler   = proc_dointvec,
5867                 },
5868                 {
5869                         .procname       = "force_tllao",
5870                         .data           = &ipv6_devconf.force_tllao,
5871                         .maxlen         = sizeof(int),
5872                         .mode           = 0644,
5873                         .proc_handler   = proc_dointvec
5874                 },
5875                 {
5876                         .procname       = "ndisc_notify",
5877                         .data           = &ipv6_devconf.ndisc_notify,
5878                         .maxlen         = sizeof(int),
5879                         .mode           = 0644,
5880                         .proc_handler   = proc_dointvec
5881                 },
5882                 {
5883                         .procname       = "suppress_frag_ndisc",
5884                         .data           = &ipv6_devconf.suppress_frag_ndisc,
5885                         .maxlen         = sizeof(int),
5886                         .mode           = 0644,
5887                         .proc_handler   = proc_dointvec
5888                 },
5889                 {
5890                         .procname       = "accept_ra_from_local",
5891                         .data           = &ipv6_devconf.accept_ra_from_local,
5892                         .maxlen         = sizeof(int),
5893                         .mode           = 0644,
5894                         .proc_handler   = proc_dointvec,
5895                 },
5896                 {
5897                         .procname       = "accept_ra_mtu",
5898                         .data           = &ipv6_devconf.accept_ra_mtu,
5899                         .maxlen         = sizeof(int),
5900                         .mode           = 0644,
5901                         .proc_handler   = proc_dointvec,
5902                 },
5903                 {
5904                         .procname       = "stable_secret",
5905                         .data           = &ipv6_devconf.stable_secret,
5906                         .maxlen         = IPV6_MAX_STRLEN,
5907                         .mode           = 0600,
5908                         .proc_handler   = addrconf_sysctl_stable_secret,
5909                 },
5910                 {
5911                         .procname       = "use_oif_addrs_only",
5912                         .data           = &ipv6_devconf.use_oif_addrs_only,
5913                         .maxlen         = sizeof(int),
5914                         .mode           = 0644,
5915                         .proc_handler   = proc_dointvec,
5916                 },
5917                 {
5918                         .procname       = "ignore_routes_with_linkdown",
5919                         .data           = &ipv6_devconf.ignore_routes_with_linkdown,
5920                         .maxlen         = sizeof(int),
5921                         .mode           = 0644,
5922                         .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
5923                 },
5924                 {
5925                         .procname       = "drop_unicast_in_l2_multicast",
5926                         .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
5927                         .maxlen         = sizeof(int),
5928                         .mode           = 0644,
5929                         .proc_handler   = proc_dointvec,
5930                 },
5931                 {
5932                         .procname       = "drop_unsolicited_na",
5933                         .data           = &ipv6_devconf.drop_unsolicited_na,
5934                         .maxlen         = sizeof(int),
5935                         .mode           = 0644,
5936                         .proc_handler   = proc_dointvec,
5937                 },
5938                 {
5939                         .procname       = "keep_addr_on_down",
5940                         .data           = &ipv6_devconf.keep_addr_on_down,
5941                         .maxlen         = sizeof(int),
5942                         .mode           = 0644,
5943                         .proc_handler   = proc_dointvec,
5944 
5945                 },
5946                 {
5947                         /* sentinel */
5948                 }
5949         },
5950 };
5951 
5952 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5953                 struct inet6_dev *idev, struct ipv6_devconf *p)
5954 {
5955         int i;
5956         struct addrconf_sysctl_table *t;
5957         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5958 
5959         t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5960         if (!t)
5961                 goto out;
5962 
5963         for (i = 0; t->addrconf_vars[i].data; i++) {
5964                 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5965                 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5966                 t->addrconf_vars[i].extra2 = net;
5967         }
5968 
5969         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5970 
5971         t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5972         if (!t->sysctl_header)
5973                 goto free;
5974 
5975         p->sysctl = t;
5976         return 0;
5977 
5978 free:
5979         kfree(t);
5980 out:
5981         return -ENOBUFS;
5982 }
5983 
5984 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5985 {
5986         struct addrconf_sysctl_table *t;
5987 
5988         if (!p->sysctl)
5989                 return;
5990 
5991         t = p->sysctl;
5992         p->sysctl = NULL;
5993         unregister_net_sysctl_table(t->sysctl_header);
5994         kfree(t);
5995 }
5996 
5997 static int addrconf_sysctl_register(struct inet6_dev *idev)
5998 {
5999         int err;
6000 
6001         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6002                 return -EINVAL;
6003 
6004         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6005                                     &ndisc_ifinfo_sysctl_change);
6006         if (err)
6007                 return err;
6008         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6009                                          idev, &idev->cnf);
6010         if (err)
6011                 neigh_sysctl_unregister(idev->nd_parms);
6012 
6013         return err;
6014 }
6015 
6016 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6017 {
6018         __addrconf_sysctl_unregister(&idev->cnf);
6019         neigh_sysctl_unregister(idev->nd_parms);
6020 }
6021 
6022 
6023 #endif
6024 
6025 static int __net_init addrconf_init_net(struct net *net)
6026 {
6027         int err = -ENOMEM;
6028         struct ipv6_devconf *all, *dflt;
6029 
6030         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6031         if (!all)
6032                 goto err_alloc_all;
6033 
6034         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6035         if (!dflt)
6036                 goto err_alloc_dflt;
6037 
6038         /* these will be inherited by all namespaces */
6039         dflt->autoconf = ipv6_defaults.autoconf;
6040         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6041 
6042         dflt->stable_secret.initialized = false;
6043         all->stable_secret.initialized = false;
6044 
6045         net->ipv6.devconf_all = all;
6046         net->ipv6.devconf_dflt = dflt;
6047 
6048 #ifdef CONFIG_SYSCTL
6049         err = __addrconf_sysctl_register(net, "all", NULL, all);
6050         if (err < 0)
6051                 goto err_reg_all;
6052 
6053         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6054         if (err < 0)
6055                 goto err_reg_dflt;
6056 #endif
6057         return 0;
6058 
6059 #ifdef CONFIG_SYSCTL
6060 err_reg_dflt:
6061         __addrconf_sysctl_unregister(all);
6062 err_reg_all:
6063         kfree(dflt);
6064 #endif
6065 err_alloc_dflt:
6066         kfree(all);
6067 err_alloc_all:
6068         return err;
6069 }
6070 
6071 static void __net_exit addrconf_exit_net(struct net *net)
6072 {
6073 #ifdef CONFIG_SYSCTL
6074         __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6075         __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6076 #endif
6077         kfree(net->ipv6.devconf_dflt);
6078         kfree(net->ipv6.devconf_all);
6079 }
6080 
6081 static struct pernet_operations addrconf_ops = {
6082         .init = addrconf_init_net,
6083         .exit = addrconf_exit_net,
6084 };
6085 
6086 static struct rtnl_af_ops inet6_ops __read_mostly = {
6087         .family           = AF_INET6,
6088         .fill_link_af     = inet6_fill_link_af,
6089         .get_link_af_size = inet6_get_link_af_size,
6090         .validate_link_af = inet6_validate_link_af,
6091         .set_link_af      = inet6_set_link_af,
6092 };
6093 
6094 /*
6095  *      Init / cleanup code
6096  */
6097 
6098 int __init addrconf_init(void)
6099 {
6100         struct inet6_dev *idev;
6101         int i, err;
6102 
6103         err = ipv6_addr_label_init();
6104         if (err < 0) {
6105                 pr_crit("%s: cannot initialize default policy table: %d\n",
6106                         __func__, err);
6107                 goto out;
6108         }
6109 
6110         err = register_pernet_subsys(&addrconf_ops);
6111         if (err < 0)
6112                 goto out_addrlabel;
6113 
6114         addrconf_wq = create_workqueue("ipv6_addrconf");
6115         if (!addrconf_wq) {
6116                 err = -ENOMEM;
6117                 goto out_nowq;
6118         }
6119 
6120         /* The addrconf netdev notifier requires that loopback_dev
6121          * has it's ipv6 private information allocated and setup
6122          * before it can bring up and give link-local addresses
6123          * to other devices which are up.
6124          *
6125          * Unfortunately, loopback_dev is not necessarily the first
6126          * entry in the global dev_base list of net devices.  In fact,
6127          * it is likely to be the very last entry on that list.
6128          * So this causes the notifier registry below to try and
6129          * give link-local addresses to all devices besides loopback_dev
6130          * first, then loopback_dev, which cases all the non-loopback_dev
6131          * devices to fail to get a link-local address.
6132          *
6133          * So, as a temporary fix, allocate the ipv6 structure for
6134          * loopback_dev first by hand.
6135          * Longer term, all of the dependencies ipv6 has upon the loopback
6136          * device and it being up should be removed.
6137          */
6138         rtnl_lock();
6139         idev = ipv6_add_dev(init_net.loopback_dev);
6140         rtnl_unlock();
6141         if (IS_ERR(idev)) {
6142                 err = PTR_ERR(idev);
6143                 goto errlo;
6144         }
6145 
6146         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6147                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6148 
6149         register_netdevice_notifier(&ipv6_dev_notf);
6150 
6151         addrconf_verify();
6152 
6153         rtnl_af_register(&inet6_ops);
6154 
6155         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6156                               NULL);
6157         if (err < 0)
6158                 goto errout;
6159 
6160         /* Only the first call to __rtnl_register can fail */
6161         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6162         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6163         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6164                         inet6_dump_ifaddr, NULL);
6165         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6166                         inet6_dump_ifmcaddr, NULL);
6167         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6168                         inet6_dump_ifacaddr, NULL);
6169         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6170                         inet6_netconf_dump_devconf, NULL);
6171 
6172         ipv6_addr_label_rtnl_register();
6173 
6174         return 0;
6175 errout:
6176         rtnl_af_unregister(&inet6_ops);
6177         unregister_netdevice_notifier(&ipv6_dev_notf);
6178 errlo:
6179         destroy_workqueue(addrconf_wq);
6180 out_nowq:
6181         unregister_pernet_subsys(&addrconf_ops);
6182 out_addrlabel:
6183         ipv6_addr_label_cleanup();
6184 out:
6185         return err;
6186 }
6187 
6188 void addrconf_cleanup(void)
6189 {
6190         struct net_device *dev;
6191         int i;
6192 
6193         unregister_netdevice_notifier(&ipv6_dev_notf);
6194         unregister_pernet_subsys(&addrconf_ops);
6195         ipv6_addr_label_cleanup();
6196 
6197         rtnl_lock();
6198 
6199         __rtnl_af_unregister(&inet6_ops);
6200 
6201         /* clean dev list */
6202         for_each_netdev(&init_net, dev) {
6203                 if (__in6_dev_get(dev) == NULL)
6204                         continue;
6205                 addrconf_ifdown(dev, 1);
6206         }
6207         addrconf_ifdown(init_net.loopback_dev, 2);
6208 
6209         /*
6210          *      Check hash table.
6211          */
6212         spin_lock_bh(&addrconf_hash_lock);
6213         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6214                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6215         spin_unlock_bh(&addrconf_hash_lock);
6216         cancel_delayed_work(&addr_chk_work);
6217         rtnl_unlock();
6218 
6219         destroy_workqueue(addrconf_wq);
6220 }
6221 

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