net: rtnetlink: plumb extended ack to doit function
[platform/kernel/linux-rpi.git] / net / ipv6 / addrconf.c
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/sched/signal.h>
47 #include <linux/socket.h>
48 #include <linux/sockios.h>
49 #include <linux/net.h>
50 #include <linux/inet.h>
51 #include <linux/in6.h>
52 #include <linux/netdevice.h>
53 #include <linux/if_addr.h>
54 #include <linux/if_arp.h>
55 #include <linux/if_arcnet.h>
56 #include <linux/if_infiniband.h>
57 #include <linux/route.h>
58 #include <linux/inetdevice.h>
59 #include <linux/init.h>
60 #include <linux/slab.h>
61 #ifdef CONFIG_SYSCTL
62 #include <linux/sysctl.h>
63 #endif
64 #include <linux/capability.h>
65 #include <linux/delay.h>
66 #include <linux/notifier.h>
67 #include <linux/string.h>
68 #include <linux/hash.h>
69
70 #include <net/net_namespace.h>
71 #include <net/sock.h>
72 #include <net/snmp.h>
73
74 #include <net/6lowpan.h>
75 #include <net/firewire.h>
76 #include <net/ipv6.h>
77 #include <net/protocol.h>
78 #include <net/ndisc.h>
79 #include <net/ip6_route.h>
80 #include <net/addrconf.h>
81 #include <net/tcp.h>
82 #include <net/ip.h>
83 #include <net/netlink.h>
84 #include <net/pkt_sched.h>
85 #include <net/l3mdev.h>
86 #include <linux/if_tunnel.h>
87 #include <linux/rtnetlink.h>
88 #include <linux/netconf.h>
89 #include <linux/random.h>
90 #include <linux/uaccess.h>
91 #include <asm/unaligned.h>
92
93 #include <linux/proc_fs.h>
94 #include <linux/seq_file.h>
95 #include <linux/export.h>
96
97 /* Set to 3 to get tracing... */
98 #define ACONF_DEBUG 2
99
100 #if ACONF_DEBUG >= 3
101 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
102 #else
103 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
104 #endif
105
106 #define INFINITY_LIFE_TIME      0xFFFFFFFF
107
108 #define IPV6_MAX_STRLEN \
109         sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
110
111 static inline u32 cstamp_delta(unsigned long cstamp)
112 {
113         return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
114 }
115
116 static inline s32 rfc3315_s14_backoff_init(s32 irt)
117 {
118         /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
119         u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
120         do_div(tmp, 1000000);
121         return (s32)tmp;
122 }
123
124 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
125 {
126         /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
127         u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
128         do_div(tmp, 1000000);
129         if ((s32)tmp > mrt) {
130                 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
131                 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
132                 do_div(tmp, 1000000);
133         }
134         return (s32)tmp;
135 }
136
137 #ifdef CONFIG_SYSCTL
138 static int addrconf_sysctl_register(struct inet6_dev *idev);
139 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
140 #else
141 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
142 {
143         return 0;
144 }
145
146 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
147 {
148 }
149 #endif
150
151 static void ipv6_regen_rndid(struct inet6_dev *idev);
152 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
153
154 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
155 static int ipv6_count_addresses(struct inet6_dev *idev);
156 static int ipv6_generate_stable_address(struct in6_addr *addr,
157                                         u8 dad_count,
158                                         const struct inet6_dev *idev);
159
160 /*
161  *      Configured unicast address hash table
162  */
163 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
164 static DEFINE_SPINLOCK(addrconf_hash_lock);
165
166 static void addrconf_verify(void);
167 static void addrconf_verify_rtnl(void);
168 static void addrconf_verify_work(struct work_struct *);
169
170 static struct workqueue_struct *addrconf_wq;
171 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
172
173 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
174 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
175
176 static void addrconf_type_change(struct net_device *dev,
177                                  unsigned long event);
178 static int addrconf_ifdown(struct net_device *dev, int how);
179
180 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
181                                                   int plen,
182                                                   const struct net_device *dev,
183                                                   u32 flags, u32 noflags);
184
185 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
186 static void addrconf_dad_work(struct work_struct *w);
187 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
188 static void addrconf_dad_run(struct inet6_dev *idev);
189 static void addrconf_rs_timer(unsigned long data);
190 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
192
193 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
194                                 struct prefix_info *pinfo);
195 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
196                                struct net_device *dev);
197
198 static struct ipv6_devconf ipv6_devconf __read_mostly = {
199         .forwarding             = 0,
200         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
201         .mtu6                   = IPV6_MIN_MTU,
202         .accept_ra              = 1,
203         .accept_redirects       = 1,
204         .autoconf               = 1,
205         .force_mld_version      = 0,
206         .mldv1_unsolicited_report_interval = 10 * HZ,
207         .mldv2_unsolicited_report_interval = HZ,
208         .dad_transmits          = 1,
209         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
210         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
211         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
212         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
213         .use_tempaddr           = 0,
214         .temp_valid_lft         = TEMP_VALID_LIFETIME,
215         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
216         .regen_max_retry        = REGEN_MAX_RETRY,
217         .max_desync_factor      = MAX_DESYNC_FACTOR,
218         .max_addresses          = IPV6_MAX_ADDRESSES,
219         .accept_ra_defrtr       = 1,
220         .accept_ra_from_local   = 0,
221         .accept_ra_min_hop_limit= 1,
222         .accept_ra_pinfo        = 1,
223 #ifdef CONFIG_IPV6_ROUTER_PREF
224         .accept_ra_rtr_pref     = 1,
225         .rtr_probe_interval     = 60 * HZ,
226 #ifdef CONFIG_IPV6_ROUTE_INFO
227         .accept_ra_rt_info_min_plen = 0,
228         .accept_ra_rt_info_max_plen = 0,
229 #endif
230 #endif
231         .proxy_ndp              = 0,
232         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
233         .disable_ipv6           = 0,
234         .accept_dad             = 1,
235         .suppress_frag_ndisc    = 1,
236         .accept_ra_mtu          = 1,
237         .stable_secret          = {
238                 .initialized = false,
239         },
240         .use_oif_addrs_only     = 0,
241         .ignore_routes_with_linkdown = 0,
242         .keep_addr_on_down      = 0,
243         .seg6_enabled           = 0,
244 #ifdef CONFIG_IPV6_SEG6_HMAC
245         .seg6_require_hmac      = 0,
246 #endif
247         .enhanced_dad           = 1,
248         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
249         .disable_policy         = 0,
250 };
251
252 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
253         .forwarding             = 0,
254         .hop_limit              = IPV6_DEFAULT_HOPLIMIT,
255         .mtu6                   = IPV6_MIN_MTU,
256         .accept_ra              = 1,
257         .accept_redirects       = 1,
258         .autoconf               = 1,
259         .force_mld_version      = 0,
260         .mldv1_unsolicited_report_interval = 10 * HZ,
261         .mldv2_unsolicited_report_interval = HZ,
262         .dad_transmits          = 1,
263         .rtr_solicits           = MAX_RTR_SOLICITATIONS,
264         .rtr_solicit_interval   = RTR_SOLICITATION_INTERVAL,
265         .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
266         .rtr_solicit_delay      = MAX_RTR_SOLICITATION_DELAY,
267         .use_tempaddr           = 0,
268         .temp_valid_lft         = TEMP_VALID_LIFETIME,
269         .temp_prefered_lft      = TEMP_PREFERRED_LIFETIME,
270         .regen_max_retry        = REGEN_MAX_RETRY,
271         .max_desync_factor      = MAX_DESYNC_FACTOR,
272         .max_addresses          = IPV6_MAX_ADDRESSES,
273         .accept_ra_defrtr       = 1,
274         .accept_ra_from_local   = 0,
275         .accept_ra_min_hop_limit= 1,
276         .accept_ra_pinfo        = 1,
277 #ifdef CONFIG_IPV6_ROUTER_PREF
278         .accept_ra_rtr_pref     = 1,
279         .rtr_probe_interval     = 60 * HZ,
280 #ifdef CONFIG_IPV6_ROUTE_INFO
281         .accept_ra_rt_info_min_plen = 0,
282         .accept_ra_rt_info_max_plen = 0,
283 #endif
284 #endif
285         .proxy_ndp              = 0,
286         .accept_source_route    = 0,    /* we do not accept RH0 by default. */
287         .disable_ipv6           = 0,
288         .accept_dad             = 1,
289         .suppress_frag_ndisc    = 1,
290         .accept_ra_mtu          = 1,
291         .stable_secret          = {
292                 .initialized = false,
293         },
294         .use_oif_addrs_only     = 0,
295         .ignore_routes_with_linkdown = 0,
296         .keep_addr_on_down      = 0,
297         .seg6_enabled           = 0,
298 #ifdef CONFIG_IPV6_SEG6_HMAC
299         .seg6_require_hmac      = 0,
300 #endif
301         .enhanced_dad           = 1,
302         .addr_gen_mode          = IN6_ADDR_GEN_MODE_EUI64,
303         .disable_policy         = 0,
304 };
305
306 /* Check if a valid qdisc is available */
307 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
308 {
309         return !qdisc_tx_is_noop(dev);
310 }
311
312 static void addrconf_del_rs_timer(struct inet6_dev *idev)
313 {
314         if (del_timer(&idev->rs_timer))
315                 __in6_dev_put(idev);
316 }
317
318 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
319 {
320         if (cancel_delayed_work(&ifp->dad_work))
321                 __in6_ifa_put(ifp);
322 }
323
324 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
325                                   unsigned long when)
326 {
327         if (!timer_pending(&idev->rs_timer))
328                 in6_dev_hold(idev);
329         mod_timer(&idev->rs_timer, jiffies + when);
330 }
331
332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
333                                    unsigned long delay)
334 {
335         if (!delayed_work_pending(&ifp->dad_work))
336                 in6_ifa_hold(ifp);
337         mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
338 }
339
340 static int snmp6_alloc_dev(struct inet6_dev *idev)
341 {
342         int i;
343
344         idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
345         if (!idev->stats.ipv6)
346                 goto err_ip;
347
348         for_each_possible_cpu(i) {
349                 struct ipstats_mib *addrconf_stats;
350                 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
351                 u64_stats_init(&addrconf_stats->syncp);
352         }
353
354
355         idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
356                                         GFP_KERNEL);
357         if (!idev->stats.icmpv6dev)
358                 goto err_icmp;
359         idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
360                                            GFP_KERNEL);
361         if (!idev->stats.icmpv6msgdev)
362                 goto err_icmpmsg;
363
364         return 0;
365
366 err_icmpmsg:
367         kfree(idev->stats.icmpv6dev);
368 err_icmp:
369         free_percpu(idev->stats.ipv6);
370 err_ip:
371         return -ENOMEM;
372 }
373
374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
375 {
376         struct inet6_dev *ndev;
377         int err = -ENOMEM;
378
379         ASSERT_RTNL();
380
381         if (dev->mtu < IPV6_MIN_MTU)
382                 return ERR_PTR(-EINVAL);
383
384         ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
385         if (!ndev)
386                 return ERR_PTR(err);
387
388         rwlock_init(&ndev->lock);
389         ndev->dev = dev;
390         INIT_LIST_HEAD(&ndev->addr_list);
391         setup_timer(&ndev->rs_timer, addrconf_rs_timer,
392                     (unsigned long)ndev);
393         memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
394
395         if (ndev->cnf.stable_secret.initialized)
396                 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
397         else
398                 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
399
400         ndev->cnf.mtu6 = dev->mtu;
401         ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
402         if (!ndev->nd_parms) {
403                 kfree(ndev);
404                 return ERR_PTR(err);
405         }
406         if (ndev->cnf.forwarding)
407                 dev_disable_lro(dev);
408         /* We refer to the device */
409         dev_hold(dev);
410
411         if (snmp6_alloc_dev(ndev) < 0) {
412                 ADBG(KERN_WARNING
413                         "%s: cannot allocate memory for statistics; dev=%s.\n",
414                         __func__, dev->name);
415                 neigh_parms_release(&nd_tbl, ndev->nd_parms);
416                 dev_put(dev);
417                 kfree(ndev);
418                 return ERR_PTR(err);
419         }
420
421         if (snmp6_register_dev(ndev) < 0) {
422                 ADBG(KERN_WARNING
423                         "%s: cannot create /proc/net/dev_snmp6/%s\n",
424                         __func__, dev->name);
425                 goto err_release;
426         }
427
428         /* One reference from device. */
429         in6_dev_hold(ndev);
430
431         if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
432                 ndev->cnf.accept_dad = -1;
433
434 #if IS_ENABLED(CONFIG_IPV6_SIT)
435         if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
436                 pr_info("%s: Disabled Multicast RS\n", dev->name);
437                 ndev->cnf.rtr_solicits = 0;
438         }
439 #endif
440
441         INIT_LIST_HEAD(&ndev->tempaddr_list);
442         ndev->desync_factor = U32_MAX;
443         if ((dev->flags&IFF_LOOPBACK) ||
444             dev->type == ARPHRD_TUNNEL ||
445             dev->type == ARPHRD_TUNNEL6 ||
446             dev->type == ARPHRD_SIT ||
447             dev->type == ARPHRD_NONE) {
448                 ndev->cnf.use_tempaddr = -1;
449         } else
450                 ipv6_regen_rndid(ndev);
451
452         ndev->token = in6addr_any;
453
454         if (netif_running(dev) && addrconf_qdisc_ok(dev))
455                 ndev->if_flags |= IF_READY;
456
457         ipv6_mc_init_dev(ndev);
458         ndev->tstamp = jiffies;
459         err = addrconf_sysctl_register(ndev);
460         if (err) {
461                 ipv6_mc_destroy_dev(ndev);
462                 snmp6_unregister_dev(ndev);
463                 goto err_release;
464         }
465         /* protected by rtnl_lock */
466         rcu_assign_pointer(dev->ip6_ptr, ndev);
467
468         /* Join interface-local all-node multicast group */
469         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
470
471         /* Join all-node multicast group */
472         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
473
474         /* Join all-router multicast group if forwarding is set */
475         if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
476                 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477
478         return ndev;
479
480 err_release:
481         neigh_parms_release(&nd_tbl, ndev->nd_parms);
482         ndev->dead = 1;
483         in6_dev_finish_destroy(ndev);
484         return ERR_PTR(err);
485 }
486
487 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
488 {
489         struct inet6_dev *idev;
490
491         ASSERT_RTNL();
492
493         idev = __in6_dev_get(dev);
494         if (!idev) {
495                 idev = ipv6_add_dev(dev);
496                 if (IS_ERR(idev))
497                         return NULL;
498         }
499
500         if (dev->flags&IFF_UP)
501                 ipv6_mc_up(idev);
502         return idev;
503 }
504
505 static int inet6_netconf_msgsize_devconf(int type)
506 {
507         int size =  NLMSG_ALIGN(sizeof(struct netconfmsg))
508                     + nla_total_size(4);        /* NETCONFA_IFINDEX */
509         bool all = false;
510
511         if (type == NETCONFA_ALL)
512                 all = true;
513
514         if (all || type == NETCONFA_FORWARDING)
515                 size += nla_total_size(4);
516 #ifdef CONFIG_IPV6_MROUTE
517         if (all || type == NETCONFA_MC_FORWARDING)
518                 size += nla_total_size(4);
519 #endif
520         if (all || type == NETCONFA_PROXY_NEIGH)
521                 size += nla_total_size(4);
522
523         if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
524                 size += nla_total_size(4);
525
526         return size;
527 }
528
529 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
530                                       struct ipv6_devconf *devconf, u32 portid,
531                                       u32 seq, int event, unsigned int flags,
532                                       int type)
533 {
534         struct nlmsghdr  *nlh;
535         struct netconfmsg *ncm;
536         bool all = false;
537
538         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
539                         flags);
540         if (!nlh)
541                 return -EMSGSIZE;
542
543         if (type == NETCONFA_ALL)
544                 all = true;
545
546         ncm = nlmsg_data(nlh);
547         ncm->ncm_family = AF_INET6;
548
549         if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
550                 goto nla_put_failure;
551
552         if (!devconf)
553                 goto out;
554
555         if ((all || type == NETCONFA_FORWARDING) &&
556             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
557                 goto nla_put_failure;
558 #ifdef CONFIG_IPV6_MROUTE
559         if ((all || type == NETCONFA_MC_FORWARDING) &&
560             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
561                         devconf->mc_forwarding) < 0)
562                 goto nla_put_failure;
563 #endif
564         if ((all || type == NETCONFA_PROXY_NEIGH) &&
565             nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
566                 goto nla_put_failure;
567
568         if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
569             nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
570                         devconf->ignore_routes_with_linkdown) < 0)
571                 goto nla_put_failure;
572
573 out:
574         nlmsg_end(skb, nlh);
575         return 0;
576
577 nla_put_failure:
578         nlmsg_cancel(skb, nlh);
579         return -EMSGSIZE;
580 }
581
582 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
583                                   int ifindex, struct ipv6_devconf *devconf)
584 {
585         struct sk_buff *skb;
586         int err = -ENOBUFS;
587
588         skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
589         if (!skb)
590                 goto errout;
591
592         err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
593                                          event, 0, type);
594         if (err < 0) {
595                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
596                 WARN_ON(err == -EMSGSIZE);
597                 kfree_skb(skb);
598                 goto errout;
599         }
600         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
601         return;
602 errout:
603         rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
604 }
605
606 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
607         [NETCONFA_IFINDEX]      = { .len = sizeof(int) },
608         [NETCONFA_FORWARDING]   = { .len = sizeof(int) },
609         [NETCONFA_PROXY_NEIGH]  = { .len = sizeof(int) },
610         [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN]  = { .len = sizeof(int) },
611 };
612
613 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
614                                      struct nlmsghdr *nlh,
615                                      struct netlink_ext_ack *extack)
616 {
617         struct net *net = sock_net(in_skb->sk);
618         struct nlattr *tb[NETCONFA_MAX+1];
619         struct netconfmsg *ncm;
620         struct sk_buff *skb;
621         struct ipv6_devconf *devconf;
622         struct inet6_dev *in6_dev;
623         struct net_device *dev;
624         int ifindex;
625         int err;
626
627         err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
628                           devconf_ipv6_policy, extack);
629         if (err < 0)
630                 goto errout;
631
632         err = -EINVAL;
633         if (!tb[NETCONFA_IFINDEX])
634                 goto errout;
635
636         ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
637         switch (ifindex) {
638         case NETCONFA_IFINDEX_ALL:
639                 devconf = net->ipv6.devconf_all;
640                 break;
641         case NETCONFA_IFINDEX_DEFAULT:
642                 devconf = net->ipv6.devconf_dflt;
643                 break;
644         default:
645                 dev = __dev_get_by_index(net, ifindex);
646                 if (!dev)
647                         goto errout;
648                 in6_dev = __in6_dev_get(dev);
649                 if (!in6_dev)
650                         goto errout;
651                 devconf = &in6_dev->cnf;
652                 break;
653         }
654
655         err = -ENOBUFS;
656         skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
657         if (!skb)
658                 goto errout;
659
660         err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
661                                          NETLINK_CB(in_skb).portid,
662                                          nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
663                                          NETCONFA_ALL);
664         if (err < 0) {
665                 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
666                 WARN_ON(err == -EMSGSIZE);
667                 kfree_skb(skb);
668                 goto errout;
669         }
670         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
671 errout:
672         return err;
673 }
674
675 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
676                                       struct netlink_callback *cb)
677 {
678         struct net *net = sock_net(skb->sk);
679         int h, s_h;
680         int idx, s_idx;
681         struct net_device *dev;
682         struct inet6_dev *idev;
683         struct hlist_head *head;
684
685         s_h = cb->args[0];
686         s_idx = idx = cb->args[1];
687
688         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
689                 idx = 0;
690                 head = &net->dev_index_head[h];
691                 rcu_read_lock();
692                 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
693                           net->dev_base_seq;
694                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
695                         if (idx < s_idx)
696                                 goto cont;
697                         idev = __in6_dev_get(dev);
698                         if (!idev)
699                                 goto cont;
700
701                         if (inet6_netconf_fill_devconf(skb, dev->ifindex,
702                                                        &idev->cnf,
703                                                        NETLINK_CB(cb->skb).portid,
704                                                        cb->nlh->nlmsg_seq,
705                                                        RTM_NEWNETCONF,
706                                                        NLM_F_MULTI,
707                                                        NETCONFA_ALL) < 0) {
708                                 rcu_read_unlock();
709                                 goto done;
710                         }
711                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
712 cont:
713                         idx++;
714                 }
715                 rcu_read_unlock();
716         }
717         if (h == NETDEV_HASHENTRIES) {
718                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
719                                                net->ipv6.devconf_all,
720                                                NETLINK_CB(cb->skb).portid,
721                                                cb->nlh->nlmsg_seq,
722                                                RTM_NEWNETCONF, NLM_F_MULTI,
723                                                NETCONFA_ALL) < 0)
724                         goto done;
725                 else
726                         h++;
727         }
728         if (h == NETDEV_HASHENTRIES + 1) {
729                 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
730                                                net->ipv6.devconf_dflt,
731                                                NETLINK_CB(cb->skb).portid,
732                                                cb->nlh->nlmsg_seq,
733                                                RTM_NEWNETCONF, NLM_F_MULTI,
734                                                NETCONFA_ALL) < 0)
735                         goto done;
736                 else
737                         h++;
738         }
739 done:
740         cb->args[0] = h;
741         cb->args[1] = idx;
742
743         return skb->len;
744 }
745
746 #ifdef CONFIG_SYSCTL
747 static void dev_forward_change(struct inet6_dev *idev)
748 {
749         struct net_device *dev;
750         struct inet6_ifaddr *ifa;
751
752         if (!idev)
753                 return;
754         dev = idev->dev;
755         if (idev->cnf.forwarding)
756                 dev_disable_lro(dev);
757         if (dev->flags & IFF_MULTICAST) {
758                 if (idev->cnf.forwarding) {
759                         ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
760                         ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
761                         ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
762                 } else {
763                         ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
764                         ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
765                         ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
766                 }
767         }
768
769         list_for_each_entry(ifa, &idev->addr_list, if_list) {
770                 if (ifa->flags&IFA_F_TENTATIVE)
771                         continue;
772                 if (idev->cnf.forwarding)
773                         addrconf_join_anycast(ifa);
774                 else
775                         addrconf_leave_anycast(ifa);
776         }
777         inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
778                                      NETCONFA_FORWARDING,
779                                      dev->ifindex, &idev->cnf);
780 }
781
782
783 static void addrconf_forward_change(struct net *net, __s32 newf)
784 {
785         struct net_device *dev;
786         struct inet6_dev *idev;
787
788         for_each_netdev(net, dev) {
789                 idev = __in6_dev_get(dev);
790                 if (idev) {
791                         int changed = (!idev->cnf.forwarding) ^ (!newf);
792                         idev->cnf.forwarding = newf;
793                         if (changed)
794                                 dev_forward_change(idev);
795                 }
796         }
797 }
798
799 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
800 {
801         struct net *net;
802         int old;
803
804         if (!rtnl_trylock())
805                 return restart_syscall();
806
807         net = (struct net *)table->extra2;
808         old = *p;
809         *p = newf;
810
811         if (p == &net->ipv6.devconf_dflt->forwarding) {
812                 if ((!newf) ^ (!old))
813                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
814                                                      NETCONFA_FORWARDING,
815                                                      NETCONFA_IFINDEX_DEFAULT,
816                                                      net->ipv6.devconf_dflt);
817                 rtnl_unlock();
818                 return 0;
819         }
820
821         if (p == &net->ipv6.devconf_all->forwarding) {
822                 int old_dflt = net->ipv6.devconf_dflt->forwarding;
823
824                 net->ipv6.devconf_dflt->forwarding = newf;
825                 if ((!newf) ^ (!old_dflt))
826                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
827                                                      NETCONFA_FORWARDING,
828                                                      NETCONFA_IFINDEX_DEFAULT,
829                                                      net->ipv6.devconf_dflt);
830
831                 addrconf_forward_change(net, newf);
832                 if ((!newf) ^ (!old))
833                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
834                                                      NETCONFA_FORWARDING,
835                                                      NETCONFA_IFINDEX_ALL,
836                                                      net->ipv6.devconf_all);
837         } else if ((!newf) ^ (!old))
838                 dev_forward_change((struct inet6_dev *)table->extra1);
839         rtnl_unlock();
840
841         if (newf)
842                 rt6_purge_dflt_routers(net);
843         return 1;
844 }
845
846 static void addrconf_linkdown_change(struct net *net, __s32 newf)
847 {
848         struct net_device *dev;
849         struct inet6_dev *idev;
850
851         for_each_netdev(net, dev) {
852                 idev = __in6_dev_get(dev);
853                 if (idev) {
854                         int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
855
856                         idev->cnf.ignore_routes_with_linkdown = newf;
857                         if (changed)
858                                 inet6_netconf_notify_devconf(dev_net(dev),
859                                                              RTM_NEWNETCONF,
860                                                              NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
861                                                              dev->ifindex,
862                                                              &idev->cnf);
863                 }
864         }
865 }
866
867 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
868 {
869         struct net *net;
870         int old;
871
872         if (!rtnl_trylock())
873                 return restart_syscall();
874
875         net = (struct net *)table->extra2;
876         old = *p;
877         *p = newf;
878
879         if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
880                 if ((!newf) ^ (!old))
881                         inet6_netconf_notify_devconf(net,
882                                                      RTM_NEWNETCONF,
883                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
884                                                      NETCONFA_IFINDEX_DEFAULT,
885                                                      net->ipv6.devconf_dflt);
886                 rtnl_unlock();
887                 return 0;
888         }
889
890         if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
891                 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
892                 addrconf_linkdown_change(net, newf);
893                 if ((!newf) ^ (!old))
894                         inet6_netconf_notify_devconf(net,
895                                                      RTM_NEWNETCONF,
896                                                      NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
897                                                      NETCONFA_IFINDEX_ALL,
898                                                      net->ipv6.devconf_all);
899         }
900         rtnl_unlock();
901
902         return 1;
903 }
904
905 #endif
906
907 /* Nobody refers to this ifaddr, destroy it */
908 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
909 {
910         WARN_ON(!hlist_unhashed(&ifp->addr_lst));
911
912 #ifdef NET_REFCNT_DEBUG
913         pr_debug("%s\n", __func__);
914 #endif
915
916         in6_dev_put(ifp->idev);
917
918         if (cancel_delayed_work(&ifp->dad_work))
919                 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
920                           ifp);
921
922         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
923                 pr_warn("Freeing alive inet6 address %p\n", ifp);
924                 return;
925         }
926         ip6_rt_put(ifp->rt);
927
928         kfree_rcu(ifp, rcu);
929 }
930
931 static void
932 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
933 {
934         struct list_head *p;
935         int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
936
937         /*
938          * Each device address list is sorted in order of scope -
939          * global before linklocal.
940          */
941         list_for_each(p, &idev->addr_list) {
942                 struct inet6_ifaddr *ifa
943                         = list_entry(p, struct inet6_ifaddr, if_list);
944                 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
945                         break;
946         }
947
948         list_add_tail(&ifp->if_list, p);
949 }
950
951 static u32 inet6_addr_hash(const struct in6_addr *addr)
952 {
953         return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
954 }
955
956 /* On success it returns ifp with increased reference count */
957
958 static struct inet6_ifaddr *
959 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
960               const struct in6_addr *peer_addr, int pfxlen,
961               int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
962 {
963         struct net *net = dev_net(idev->dev);
964         struct inet6_ifaddr *ifa = NULL;
965         struct rt6_info *rt;
966         unsigned int hash;
967         int err = 0;
968         int addr_type = ipv6_addr_type(addr);
969
970         if (addr_type == IPV6_ADDR_ANY ||
971             addr_type & IPV6_ADDR_MULTICAST ||
972             (!(idev->dev->flags & IFF_LOOPBACK) &&
973              addr_type & IPV6_ADDR_LOOPBACK))
974                 return ERR_PTR(-EADDRNOTAVAIL);
975
976         rcu_read_lock_bh();
977         if (idev->dead) {
978                 err = -ENODEV;                  /*XXX*/
979                 goto out2;
980         }
981
982         if (idev->cnf.disable_ipv6) {
983                 err = -EACCES;
984                 goto out2;
985         }
986
987         spin_lock(&addrconf_hash_lock);
988
989         /* Ignore adding duplicate addresses on an interface */
990         if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
991                 ADBG("ipv6_add_addr: already assigned\n");
992                 err = -EEXIST;
993                 goto out;
994         }
995
996         ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
997
998         if (!ifa) {
999                 ADBG("ipv6_add_addr: malloc failed\n");
1000                 err = -ENOBUFS;
1001                 goto out;
1002         }
1003
1004         rt = addrconf_dst_alloc(idev, addr, false);
1005         if (IS_ERR(rt)) {
1006                 err = PTR_ERR(rt);
1007                 goto out;
1008         }
1009
1010         if (net->ipv6.devconf_all->disable_policy ||
1011             idev->cnf.disable_policy)
1012                 rt->dst.flags |= DST_NOPOLICY;
1013
1014         neigh_parms_data_state_setall(idev->nd_parms);
1015
1016         ifa->addr = *addr;
1017         if (peer_addr)
1018                 ifa->peer_addr = *peer_addr;
1019
1020         spin_lock_init(&ifa->lock);
1021         INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1022         INIT_HLIST_NODE(&ifa->addr_lst);
1023         ifa->scope = scope;
1024         ifa->prefix_len = pfxlen;
1025         ifa->flags = flags | IFA_F_TENTATIVE;
1026         ifa->valid_lft = valid_lft;
1027         ifa->prefered_lft = prefered_lft;
1028         ifa->cstamp = ifa->tstamp = jiffies;
1029         ifa->tokenized = false;
1030
1031         ifa->rt = rt;
1032
1033         ifa->idev = idev;
1034         in6_dev_hold(idev);
1035         /* For caller */
1036         in6_ifa_hold(ifa);
1037
1038         /* Add to big hash table */
1039         hash = inet6_addr_hash(addr);
1040
1041         hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1042         spin_unlock(&addrconf_hash_lock);
1043
1044         write_lock(&idev->lock);
1045         /* Add to inet6_dev unicast addr list. */
1046         ipv6_link_dev_addr(idev, ifa);
1047
1048         if (ifa->flags&IFA_F_TEMPORARY) {
1049                 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1050                 in6_ifa_hold(ifa);
1051         }
1052
1053         in6_ifa_hold(ifa);
1054         write_unlock(&idev->lock);
1055 out2:
1056         rcu_read_unlock_bh();
1057
1058         if (likely(err == 0))
1059                 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1060         else {
1061                 kfree(ifa);
1062                 ifa = ERR_PTR(err);
1063         }
1064
1065         return ifa;
1066 out:
1067         spin_unlock(&addrconf_hash_lock);
1068         goto out2;
1069 }
1070
1071 enum cleanup_prefix_rt_t {
1072         CLEANUP_PREFIX_RT_NOP,    /* no cleanup action for prefix route */
1073         CLEANUP_PREFIX_RT_DEL,    /* delete the prefix route */
1074         CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1075 };
1076
1077 /*
1078  * Check, whether the prefix for ifp would still need a prefix route
1079  * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1080  * constants.
1081  *
1082  * 1) we don't purge prefix if address was not permanent.
1083  *    prefix is managed by its own lifetime.
1084  * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1085  * 3) if there are no addresses, delete prefix.
1086  * 4) if there are still other permanent address(es),
1087  *    corresponding prefix is still permanent.
1088  * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1089  *    don't purge the prefix, assume user space is managing it.
1090  * 6) otherwise, update prefix lifetime to the
1091  *    longest valid lifetime among the corresponding
1092  *    addresses on the device.
1093  *    Note: subsequent RA will update lifetime.
1094  **/
1095 static enum cleanup_prefix_rt_t
1096 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1097 {
1098         struct inet6_ifaddr *ifa;
1099         struct inet6_dev *idev = ifp->idev;
1100         unsigned long lifetime;
1101         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1102
1103         *expires = jiffies;
1104
1105         list_for_each_entry(ifa, &idev->addr_list, if_list) {
1106                 if (ifa == ifp)
1107                         continue;
1108                 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1109                                        ifp->prefix_len))
1110                         continue;
1111                 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1112                         return CLEANUP_PREFIX_RT_NOP;
1113
1114                 action = CLEANUP_PREFIX_RT_EXPIRE;
1115
1116                 spin_lock(&ifa->lock);
1117
1118                 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1119                 /*
1120                  * Note: Because this address is
1121                  * not permanent, lifetime <
1122                  * LONG_MAX / HZ here.
1123                  */
1124                 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1125                         *expires = ifa->tstamp + lifetime * HZ;
1126                 spin_unlock(&ifa->lock);
1127         }
1128
1129         return action;
1130 }
1131
1132 static void
1133 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1134 {
1135         struct rt6_info *rt;
1136
1137         rt = addrconf_get_prefix_route(&ifp->addr,
1138                                        ifp->prefix_len,
1139                                        ifp->idev->dev,
1140                                        0, RTF_GATEWAY | RTF_DEFAULT);
1141         if (rt) {
1142                 if (del_rt)
1143                         ip6_del_rt(rt);
1144                 else {
1145                         if (!(rt->rt6i_flags & RTF_EXPIRES))
1146                                 rt6_set_expires(rt, expires);
1147                         ip6_rt_put(rt);
1148                 }
1149         }
1150 }
1151
1152
1153 /* This function wants to get referenced ifp and releases it before return */
1154
1155 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1156 {
1157         int state;
1158         enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1159         unsigned long expires;
1160
1161         ASSERT_RTNL();
1162
1163         spin_lock_bh(&ifp->lock);
1164         state = ifp->state;
1165         ifp->state = INET6_IFADDR_STATE_DEAD;
1166         spin_unlock_bh(&ifp->lock);
1167
1168         if (state == INET6_IFADDR_STATE_DEAD)
1169                 goto out;
1170
1171         spin_lock_bh(&addrconf_hash_lock);
1172         hlist_del_init_rcu(&ifp->addr_lst);
1173         spin_unlock_bh(&addrconf_hash_lock);
1174
1175         write_lock_bh(&ifp->idev->lock);
1176
1177         if (ifp->flags&IFA_F_TEMPORARY) {
1178                 list_del(&ifp->tmp_list);
1179                 if (ifp->ifpub) {
1180                         in6_ifa_put(ifp->ifpub);
1181                         ifp->ifpub = NULL;
1182                 }
1183                 __in6_ifa_put(ifp);
1184         }
1185
1186         if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1187                 action = check_cleanup_prefix_route(ifp, &expires);
1188
1189         list_del_init(&ifp->if_list);
1190         __in6_ifa_put(ifp);
1191
1192         write_unlock_bh(&ifp->idev->lock);
1193
1194         addrconf_del_dad_work(ifp);
1195
1196         ipv6_ifa_notify(RTM_DELADDR, ifp);
1197
1198         inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1199
1200         if (action != CLEANUP_PREFIX_RT_NOP) {
1201                 cleanup_prefix_route(ifp, expires,
1202                         action == CLEANUP_PREFIX_RT_DEL);
1203         }
1204
1205         /* clean up prefsrc entries */
1206         rt6_remove_prefsrc(ifp);
1207 out:
1208         in6_ifa_put(ifp);
1209 }
1210
1211 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1212 {
1213         struct inet6_dev *idev = ifp->idev;
1214         struct in6_addr addr, *tmpaddr;
1215         unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1216         unsigned long regen_advance;
1217         int tmp_plen;
1218         int ret = 0;
1219         u32 addr_flags;
1220         unsigned long now = jiffies;
1221         long max_desync_factor;
1222         s32 cnf_temp_preferred_lft;
1223
1224         write_lock_bh(&idev->lock);
1225         if (ift) {
1226                 spin_lock_bh(&ift->lock);
1227                 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1228                 spin_unlock_bh(&ift->lock);
1229                 tmpaddr = &addr;
1230         } else {
1231                 tmpaddr = NULL;
1232         }
1233 retry:
1234         in6_dev_hold(idev);
1235         if (idev->cnf.use_tempaddr <= 0) {
1236                 write_unlock_bh(&idev->lock);
1237                 pr_info("%s: use_tempaddr is disabled\n", __func__);
1238                 in6_dev_put(idev);
1239                 ret = -1;
1240                 goto out;
1241         }
1242         spin_lock_bh(&ifp->lock);
1243         if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1244                 idev->cnf.use_tempaddr = -1;    /*XXX*/
1245                 spin_unlock_bh(&ifp->lock);
1246                 write_unlock_bh(&idev->lock);
1247                 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1248                         __func__);
1249                 in6_dev_put(idev);
1250                 ret = -1;
1251                 goto out;
1252         }
1253         in6_ifa_hold(ifp);
1254         memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1255         ipv6_try_regen_rndid(idev, tmpaddr);
1256         memcpy(&addr.s6_addr[8], idev->rndid, 8);
1257         age = (now - ifp->tstamp) / HZ;
1258
1259         regen_advance = idev->cnf.regen_max_retry *
1260                         idev->cnf.dad_transmits *
1261                         NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1262
1263         /* recalculate max_desync_factor each time and update
1264          * idev->desync_factor if it's larger
1265          */
1266         cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1267         max_desync_factor = min_t(__u32,
1268                                   idev->cnf.max_desync_factor,
1269                                   cnf_temp_preferred_lft - regen_advance);
1270
1271         if (unlikely(idev->desync_factor > max_desync_factor)) {
1272                 if (max_desync_factor > 0) {
1273                         get_random_bytes(&idev->desync_factor,
1274                                          sizeof(idev->desync_factor));
1275                         idev->desync_factor %= max_desync_factor;
1276                 } else {
1277                         idev->desync_factor = 0;
1278                 }
1279         }
1280
1281         tmp_valid_lft = min_t(__u32,
1282                               ifp->valid_lft,
1283                               idev->cnf.temp_valid_lft + age);
1284         tmp_prefered_lft = cnf_temp_preferred_lft + age -
1285                             idev->desync_factor;
1286         tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1287         tmp_plen = ifp->prefix_len;
1288         tmp_tstamp = ifp->tstamp;
1289         spin_unlock_bh(&ifp->lock);
1290
1291         write_unlock_bh(&idev->lock);
1292
1293         /* A temporary address is created only if this calculated Preferred
1294          * Lifetime is greater than REGEN_ADVANCE time units.  In particular,
1295          * an implementation must not create a temporary address with a zero
1296          * Preferred Lifetime.
1297          * Use age calculation as in addrconf_verify to avoid unnecessary
1298          * temporary addresses being generated.
1299          */
1300         age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1301         if (tmp_prefered_lft <= regen_advance + age) {
1302                 in6_ifa_put(ifp);
1303                 in6_dev_put(idev);
1304                 ret = -1;
1305                 goto out;
1306         }
1307
1308         addr_flags = IFA_F_TEMPORARY;
1309         /* set in addrconf_prefix_rcv() */
1310         if (ifp->flags & IFA_F_OPTIMISTIC)
1311                 addr_flags |= IFA_F_OPTIMISTIC;
1312
1313         ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1314                             ipv6_addr_scope(&addr), addr_flags,
1315                             tmp_valid_lft, tmp_prefered_lft);
1316         if (IS_ERR(ift)) {
1317                 in6_ifa_put(ifp);
1318                 in6_dev_put(idev);
1319                 pr_info("%s: retry temporary address regeneration\n", __func__);
1320                 tmpaddr = &addr;
1321                 write_lock_bh(&idev->lock);
1322                 goto retry;
1323         }
1324
1325         spin_lock_bh(&ift->lock);
1326         ift->ifpub = ifp;
1327         ift->cstamp = now;
1328         ift->tstamp = tmp_tstamp;
1329         spin_unlock_bh(&ift->lock);
1330
1331         addrconf_dad_start(ift);
1332         in6_ifa_put(ift);
1333         in6_dev_put(idev);
1334 out:
1335         return ret;
1336 }
1337
1338 /*
1339  *      Choose an appropriate source address (RFC3484)
1340  */
1341 enum {
1342         IPV6_SADDR_RULE_INIT = 0,
1343         IPV6_SADDR_RULE_LOCAL,
1344         IPV6_SADDR_RULE_SCOPE,
1345         IPV6_SADDR_RULE_PREFERRED,
1346 #ifdef CONFIG_IPV6_MIP6
1347         IPV6_SADDR_RULE_HOA,
1348 #endif
1349         IPV6_SADDR_RULE_OIF,
1350         IPV6_SADDR_RULE_LABEL,
1351         IPV6_SADDR_RULE_PRIVACY,
1352         IPV6_SADDR_RULE_ORCHID,
1353         IPV6_SADDR_RULE_PREFIX,
1354 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1355         IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1356 #endif
1357         IPV6_SADDR_RULE_MAX
1358 };
1359
1360 struct ipv6_saddr_score {
1361         int                     rule;
1362         int                     addr_type;
1363         struct inet6_ifaddr     *ifa;
1364         DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1365         int                     scopedist;
1366         int                     matchlen;
1367 };
1368
1369 struct ipv6_saddr_dst {
1370         const struct in6_addr *addr;
1371         int ifindex;
1372         int scope;
1373         int label;
1374         unsigned int prefs;
1375 };
1376
1377 static inline int ipv6_saddr_preferred(int type)
1378 {
1379         if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1380                 return 1;
1381         return 0;
1382 }
1383
1384 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1385 {
1386 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1387         return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1388 #else
1389         return false;
1390 #endif
1391 }
1392
1393 static int ipv6_get_saddr_eval(struct net *net,
1394                                struct ipv6_saddr_score *score,
1395                                struct ipv6_saddr_dst *dst,
1396                                int i)
1397 {
1398         int ret;
1399
1400         if (i <= score->rule) {
1401                 switch (i) {
1402                 case IPV6_SADDR_RULE_SCOPE:
1403                         ret = score->scopedist;
1404                         break;
1405                 case IPV6_SADDR_RULE_PREFIX:
1406                         ret = score->matchlen;
1407                         break;
1408                 default:
1409                         ret = !!test_bit(i, score->scorebits);
1410                 }
1411                 goto out;
1412         }
1413
1414         switch (i) {
1415         case IPV6_SADDR_RULE_INIT:
1416                 /* Rule 0: remember if hiscore is not ready yet */
1417                 ret = !!score->ifa;
1418                 break;
1419         case IPV6_SADDR_RULE_LOCAL:
1420                 /* Rule 1: Prefer same address */
1421                 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1422                 break;
1423         case IPV6_SADDR_RULE_SCOPE:
1424                 /* Rule 2: Prefer appropriate scope
1425                  *
1426                  *      ret
1427                  *       ^
1428                  *    -1 |  d 15
1429                  *    ---+--+-+---> scope
1430                  *       |
1431                  *       |             d is scope of the destination.
1432                  *  B-d  |  \
1433                  *       |   \      <- smaller scope is better if
1434                  *  B-15 |    \        if scope is enough for destination.
1435                  *       |             ret = B - scope (-1 <= scope >= d <= 15).
1436                  * d-C-1 | /
1437                  *       |/         <- greater is better
1438                  *   -C  /             if scope is not enough for destination.
1439                  *      /|             ret = scope - C (-1 <= d < scope <= 15).
1440                  *
1441                  * d - C - 1 < B -15 (for all -1 <= d <= 15).
1442                  * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1443                  * Assume B = 0 and we get C > 29.
1444                  */
1445                 ret = __ipv6_addr_src_scope(score->addr_type);
1446                 if (ret >= dst->scope)
1447                         ret = -ret;
1448                 else
1449                         ret -= 128;     /* 30 is enough */
1450                 score->scopedist = ret;
1451                 break;
1452         case IPV6_SADDR_RULE_PREFERRED:
1453             {
1454                 /* Rule 3: Avoid deprecated and optimistic addresses */
1455                 u8 avoid = IFA_F_DEPRECATED;
1456
1457                 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1458                         avoid |= IFA_F_OPTIMISTIC;
1459                 ret = ipv6_saddr_preferred(score->addr_type) ||
1460                       !(score->ifa->flags & avoid);
1461                 break;
1462             }
1463 #ifdef CONFIG_IPV6_MIP6
1464         case IPV6_SADDR_RULE_HOA:
1465             {
1466                 /* Rule 4: Prefer home address */
1467                 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1468                 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1469                 break;
1470             }
1471 #endif
1472         case IPV6_SADDR_RULE_OIF:
1473                 /* Rule 5: Prefer outgoing interface */
1474                 ret = (!dst->ifindex ||
1475                        dst->ifindex == score->ifa->idev->dev->ifindex);
1476                 break;
1477         case IPV6_SADDR_RULE_LABEL:
1478                 /* Rule 6: Prefer matching label */
1479                 ret = ipv6_addr_label(net,
1480                                       &score->ifa->addr, score->addr_type,
1481                                       score->ifa->idev->dev->ifindex) == dst->label;
1482                 break;
1483         case IPV6_SADDR_RULE_PRIVACY:
1484             {
1485                 /* Rule 7: Prefer public address
1486                  * Note: prefer temporary address if use_tempaddr >= 2
1487                  */
1488                 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1489                                 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1490                                 score->ifa->idev->cnf.use_tempaddr >= 2;
1491                 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1492                 break;
1493             }
1494         case IPV6_SADDR_RULE_ORCHID:
1495                 /* Rule 8-: Prefer ORCHID vs ORCHID or
1496                  *          non-ORCHID vs non-ORCHID
1497                  */
1498                 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1499                         ipv6_addr_orchid(dst->addr));
1500                 break;
1501         case IPV6_SADDR_RULE_PREFIX:
1502                 /* Rule 8: Use longest matching prefix */
1503                 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1504                 if (ret > score->ifa->prefix_len)
1505                         ret = score->ifa->prefix_len;
1506                 score->matchlen = ret;
1507                 break;
1508 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1509         case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1510                 /* Optimistic addresses still have lower precedence than other
1511                  * preferred addresses.
1512                  */
1513                 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1514                 break;
1515 #endif
1516         default:
1517                 ret = 0;
1518         }
1519
1520         if (ret)
1521                 __set_bit(i, score->scorebits);
1522         score->rule = i;
1523 out:
1524         return ret;
1525 }
1526
1527 static int __ipv6_dev_get_saddr(struct net *net,
1528                                 struct ipv6_saddr_dst *dst,
1529                                 struct inet6_dev *idev,
1530                                 struct ipv6_saddr_score *scores,
1531                                 int hiscore_idx)
1532 {
1533         struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1534
1535         read_lock_bh(&idev->lock);
1536         list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1537                 int i;
1538
1539                 /*
1540                  * - Tentative Address (RFC2462 section 5.4)
1541                  *  - A tentative address is not considered
1542                  *    "assigned to an interface" in the traditional
1543                  *    sense, unless it is also flagged as optimistic.
1544                  * - Candidate Source Address (section 4)
1545                  *  - In any case, anycast addresses, multicast
1546                  *    addresses, and the unspecified address MUST
1547                  *    NOT be included in a candidate set.
1548                  */
1549                 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1550                     (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1551                         continue;
1552
1553                 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1554
1555                 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1556                              score->addr_type & IPV6_ADDR_MULTICAST)) {
1557                         net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1558                                             idev->dev->name);
1559                         continue;
1560                 }
1561
1562                 score->rule = -1;
1563                 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1564
1565                 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1566                         int minihiscore, miniscore;
1567
1568                         minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1569                         miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1570
1571                         if (minihiscore > miniscore) {
1572                                 if (i == IPV6_SADDR_RULE_SCOPE &&
1573                                     score->scopedist > 0) {
1574                                         /*
1575                                          * special case:
1576                                          * each remaining entry
1577                                          * has too small (not enough)
1578                                          * scope, because ifa entries
1579                                          * are sorted by their scope
1580                                          * values.
1581                                          */
1582                                         goto out;
1583                                 }
1584                                 break;
1585                         } else if (minihiscore < miniscore) {
1586                                 if (hiscore->ifa)
1587                                         in6_ifa_put(hiscore->ifa);
1588
1589                                 in6_ifa_hold(score->ifa);
1590
1591                                 swap(hiscore, score);
1592                                 hiscore_idx = 1 - hiscore_idx;
1593
1594                                 /* restore our iterator */
1595                                 score->ifa = hiscore->ifa;
1596
1597                                 break;
1598                         }
1599                 }
1600         }
1601 out:
1602         read_unlock_bh(&idev->lock);
1603         return hiscore_idx;
1604 }
1605
1606 static int ipv6_get_saddr_master(struct net *net,
1607                                  const struct net_device *dst_dev,
1608                                  const struct net_device *master,
1609                                  struct ipv6_saddr_dst *dst,
1610                                  struct ipv6_saddr_score *scores,
1611                                  int hiscore_idx)
1612 {
1613         struct inet6_dev *idev;
1614
1615         idev = __in6_dev_get(dst_dev);
1616         if (idev)
1617                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1618                                                    scores, hiscore_idx);
1619
1620         idev = __in6_dev_get(master);
1621         if (idev)
1622                 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1623                                                    scores, hiscore_idx);
1624
1625         return hiscore_idx;
1626 }
1627
1628 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1629                        const struct in6_addr *daddr, unsigned int prefs,
1630                        struct in6_addr *saddr)
1631 {
1632         struct ipv6_saddr_score scores[2], *hiscore;
1633         struct ipv6_saddr_dst dst;
1634         struct inet6_dev *idev;
1635         struct net_device *dev;
1636         int dst_type;
1637         bool use_oif_addr = false;
1638         int hiscore_idx = 0;
1639
1640         dst_type = __ipv6_addr_type(daddr);
1641         dst.addr = daddr;
1642         dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1643         dst.scope = __ipv6_addr_src_scope(dst_type);
1644         dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1645         dst.prefs = prefs;
1646
1647         scores[hiscore_idx].rule = -1;
1648         scores[hiscore_idx].ifa = NULL;
1649
1650         rcu_read_lock();
1651
1652         /* Candidate Source Address (section 4)
1653          *  - multicast and link-local destination address,
1654          *    the set of candidate source address MUST only
1655          *    include addresses assigned to interfaces
1656          *    belonging to the same link as the outgoing
1657          *    interface.
1658          * (- For site-local destination addresses, the
1659          *    set of candidate source addresses MUST only
1660          *    include addresses assigned to interfaces
1661          *    belonging to the same site as the outgoing
1662          *    interface.)
1663          *  - "It is RECOMMENDED that the candidate source addresses
1664          *    be the set of unicast addresses assigned to the
1665          *    interface that will be used to send to the destination
1666          *    (the 'outgoing' interface)." (RFC 6724)
1667          */
1668         if (dst_dev) {
1669                 idev = __in6_dev_get(dst_dev);
1670                 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1671                     dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1672                     (idev && idev->cnf.use_oif_addrs_only)) {
1673                         use_oif_addr = true;
1674                 }
1675         }
1676
1677         if (use_oif_addr) {
1678                 if (idev)
1679                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1680         } else {
1681                 const struct net_device *master;
1682                 int master_idx = 0;
1683
1684                 /* if dst_dev exists and is enslaved to an L3 device, then
1685                  * prefer addresses from dst_dev and then the master over
1686                  * any other enslaved devices in the L3 domain.
1687                  */
1688                 master = l3mdev_master_dev_rcu(dst_dev);
1689                 if (master) {
1690                         master_idx = master->ifindex;
1691
1692                         hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1693                                                             master, &dst,
1694                                                             scores, hiscore_idx);
1695
1696                         if (scores[hiscore_idx].ifa)
1697                                 goto out;
1698                 }
1699
1700                 for_each_netdev_rcu(net, dev) {
1701                         /* only consider addresses on devices in the
1702                          * same L3 domain
1703                          */
1704                         if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1705                                 continue;
1706                         idev = __in6_dev_get(dev);
1707                         if (!idev)
1708                                 continue;
1709                         hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1710                 }
1711         }
1712
1713 out:
1714         rcu_read_unlock();
1715
1716         hiscore = &scores[hiscore_idx];
1717         if (!hiscore->ifa)
1718                 return -EADDRNOTAVAIL;
1719
1720         *saddr = hiscore->ifa->addr;
1721         in6_ifa_put(hiscore->ifa);
1722         return 0;
1723 }
1724 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1725
1726 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1727                       u32 banned_flags)
1728 {
1729         struct inet6_ifaddr *ifp;
1730         int err = -EADDRNOTAVAIL;
1731
1732         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1733                 if (ifp->scope > IFA_LINK)
1734                         break;
1735                 if (ifp->scope == IFA_LINK &&
1736                     !(ifp->flags & banned_flags)) {
1737                         *addr = ifp->addr;
1738                         err = 0;
1739                         break;
1740                 }
1741         }
1742         return err;
1743 }
1744
1745 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1746                     u32 banned_flags)
1747 {
1748         struct inet6_dev *idev;
1749         int err = -EADDRNOTAVAIL;
1750
1751         rcu_read_lock();
1752         idev = __in6_dev_get(dev);
1753         if (idev) {
1754                 read_lock_bh(&idev->lock);
1755                 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1756                 read_unlock_bh(&idev->lock);
1757         }
1758         rcu_read_unlock();
1759         return err;
1760 }
1761
1762 static int ipv6_count_addresses(struct inet6_dev *idev)
1763 {
1764         int cnt = 0;
1765         struct inet6_ifaddr *ifp;
1766
1767         read_lock_bh(&idev->lock);
1768         list_for_each_entry(ifp, &idev->addr_list, if_list)
1769                 cnt++;
1770         read_unlock_bh(&idev->lock);
1771         return cnt;
1772 }
1773
1774 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1775                   const struct net_device *dev, int strict)
1776 {
1777         return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1778 }
1779 EXPORT_SYMBOL(ipv6_chk_addr);
1780
1781 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1782                             const struct net_device *dev, int strict,
1783                             u32 banned_flags)
1784 {
1785         struct inet6_ifaddr *ifp;
1786         unsigned int hash = inet6_addr_hash(addr);
1787         u32 ifp_flags;
1788
1789         rcu_read_lock_bh();
1790         hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1791                 if (!net_eq(dev_net(ifp->idev->dev), net))
1792                         continue;
1793                 /* Decouple optimistic from tentative for evaluation here.
1794                  * Ban optimistic addresses explicitly, when required.
1795                  */
1796                 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1797                             ? (ifp->flags&~IFA_F_TENTATIVE)
1798                             : ifp->flags;
1799                 if (ipv6_addr_equal(&ifp->addr, addr) &&
1800                     !(ifp_flags&banned_flags) &&
1801                     (!dev || ifp->idev->dev == dev ||
1802                      !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1803                         rcu_read_unlock_bh();
1804                         return 1;
1805                 }
1806         }
1807
1808         rcu_read_unlock_bh();
1809         return 0;
1810 }
1811 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1812
1813 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1814                                struct net_device *dev)
1815 {
1816         unsigned int hash = inet6_addr_hash(addr);
1817         struct inet6_ifaddr *ifp;
1818
1819         hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1820                 if (!net_eq(dev_net(ifp->idev->dev), net))
1821                         continue;
1822                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1823                         if (!dev || ifp->idev->dev == dev)
1824                                 return true;
1825                 }
1826         }
1827         return false;
1828 }
1829
1830 /* Compares an address/prefix_len with addresses on device @dev.
1831  * If one is found it returns true.
1832  */
1833 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1834         const unsigned int prefix_len, struct net_device *dev)
1835 {
1836         struct inet6_dev *idev;
1837         struct inet6_ifaddr *ifa;
1838         bool ret = false;
1839
1840         rcu_read_lock();
1841         idev = __in6_dev_get(dev);
1842         if (idev) {
1843                 read_lock_bh(&idev->lock);
1844                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1845                         ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1846                         if (ret)
1847                                 break;
1848                 }
1849                 read_unlock_bh(&idev->lock);
1850         }
1851         rcu_read_unlock();
1852
1853         return ret;
1854 }
1855 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1856
1857 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1858 {
1859         struct inet6_dev *idev;
1860         struct inet6_ifaddr *ifa;
1861         int     onlink;
1862
1863         onlink = 0;
1864         rcu_read_lock();
1865         idev = __in6_dev_get(dev);
1866         if (idev) {
1867                 read_lock_bh(&idev->lock);
1868                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1869                         onlink = ipv6_prefix_equal(addr, &ifa->addr,
1870                                                    ifa->prefix_len);
1871                         if (onlink)
1872                                 break;
1873                 }
1874                 read_unlock_bh(&idev->lock);
1875         }
1876         rcu_read_unlock();
1877         return onlink;
1878 }
1879 EXPORT_SYMBOL(ipv6_chk_prefix);
1880
1881 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1882                                      struct net_device *dev, int strict)
1883 {
1884         struct inet6_ifaddr *ifp, *result = NULL;
1885         unsigned int hash = inet6_addr_hash(addr);
1886
1887         rcu_read_lock_bh();
1888         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1889                 if (!net_eq(dev_net(ifp->idev->dev), net))
1890                         continue;
1891                 if (ipv6_addr_equal(&ifp->addr, addr)) {
1892                         if (!dev || ifp->idev->dev == dev ||
1893                             !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1894                                 result = ifp;
1895                                 in6_ifa_hold(ifp);
1896                                 break;
1897                         }
1898                 }
1899         }
1900         rcu_read_unlock_bh();
1901
1902         return result;
1903 }
1904
1905 /* Gets referenced address, destroys ifaddr */
1906
1907 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1908 {
1909         if (dad_failed)
1910                 ifp->flags |= IFA_F_DADFAILED;
1911
1912         if (ifp->flags&IFA_F_PERMANENT) {
1913                 spin_lock_bh(&ifp->lock);
1914                 addrconf_del_dad_work(ifp);
1915                 ifp->flags |= IFA_F_TENTATIVE;
1916                 spin_unlock_bh(&ifp->lock);
1917                 if (dad_failed)
1918                         ipv6_ifa_notify(0, ifp);
1919                 in6_ifa_put(ifp);
1920         } else if (ifp->flags&IFA_F_TEMPORARY) {
1921                 struct inet6_ifaddr *ifpub;
1922                 spin_lock_bh(&ifp->lock);
1923                 ifpub = ifp->ifpub;
1924                 if (ifpub) {
1925                         in6_ifa_hold(ifpub);
1926                         spin_unlock_bh(&ifp->lock);
1927                         ipv6_create_tempaddr(ifpub, ifp);
1928                         in6_ifa_put(ifpub);
1929                 } else {
1930                         spin_unlock_bh(&ifp->lock);
1931                 }
1932                 ipv6_del_addr(ifp);
1933         } else {
1934                 ipv6_del_addr(ifp);
1935         }
1936 }
1937
1938 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1939 {
1940         int err = -ENOENT;
1941
1942         spin_lock_bh(&ifp->lock);
1943         if (ifp->state == INET6_IFADDR_STATE_DAD) {
1944                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1945                 err = 0;
1946         }
1947         spin_unlock_bh(&ifp->lock);
1948
1949         return err;
1950 }
1951
1952 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1953 {
1954         struct inet6_dev *idev = ifp->idev;
1955         struct net *net = dev_net(ifp->idev->dev);
1956
1957         if (addrconf_dad_end(ifp)) {
1958                 in6_ifa_put(ifp);
1959                 return;
1960         }
1961
1962         net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1963                              ifp->idev->dev->name, &ifp->addr);
1964
1965         spin_lock_bh(&ifp->lock);
1966
1967         if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1968                 int scope = ifp->scope;
1969                 u32 flags = ifp->flags;
1970                 struct in6_addr new_addr;
1971                 struct inet6_ifaddr *ifp2;
1972                 u32 valid_lft, preferred_lft;
1973                 int pfxlen = ifp->prefix_len;
1974                 int retries = ifp->stable_privacy_retry + 1;
1975
1976                 if (retries > net->ipv6.sysctl.idgen_retries) {
1977                         net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1978                                              ifp->idev->dev->name);
1979                         goto errdad;
1980                 }
1981
1982                 new_addr = ifp->addr;
1983                 if (ipv6_generate_stable_address(&new_addr, retries,
1984                                                  idev))
1985                         goto errdad;
1986
1987                 valid_lft = ifp->valid_lft;
1988                 preferred_lft = ifp->prefered_lft;
1989
1990                 spin_unlock_bh(&ifp->lock);
1991
1992                 if (idev->cnf.max_addresses &&
1993                     ipv6_count_addresses(idev) >=
1994                     idev->cnf.max_addresses)
1995                         goto lock_errdad;
1996
1997                 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1998                                      ifp->idev->dev->name);
1999
2000                 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2001                                      scope, flags, valid_lft,
2002                                      preferred_lft);
2003                 if (IS_ERR(ifp2))
2004                         goto lock_errdad;
2005
2006                 spin_lock_bh(&ifp2->lock);
2007                 ifp2->stable_privacy_retry = retries;
2008                 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2009                 spin_unlock_bh(&ifp2->lock);
2010
2011                 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2012                 in6_ifa_put(ifp2);
2013 lock_errdad:
2014                 spin_lock_bh(&ifp->lock);
2015         }
2016
2017 errdad:
2018         /* transition from _POSTDAD to _ERRDAD */
2019         ifp->state = INET6_IFADDR_STATE_ERRDAD;
2020         spin_unlock_bh(&ifp->lock);
2021
2022         addrconf_mod_dad_work(ifp, 0);
2023         in6_ifa_put(ifp);
2024 }
2025
2026 /* Join to solicited addr multicast group.
2027  * caller must hold RTNL */
2028 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2029 {
2030         struct in6_addr maddr;
2031
2032         if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2033                 return;
2034
2035         addrconf_addr_solict_mult(addr, &maddr);
2036         ipv6_dev_mc_inc(dev, &maddr);
2037 }
2038
2039 /* caller must hold RTNL */
2040 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2041 {
2042         struct in6_addr maddr;
2043
2044         if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2045                 return;
2046
2047         addrconf_addr_solict_mult(addr, &maddr);
2048         __ipv6_dev_mc_dec(idev, &maddr);
2049 }
2050
2051 /* caller must hold RTNL */
2052 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2053 {
2054         struct in6_addr addr;
2055
2056         if (ifp->prefix_len >= 127) /* RFC 6164 */
2057                 return;
2058         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2059         if (ipv6_addr_any(&addr))
2060                 return;
2061         __ipv6_dev_ac_inc(ifp->idev, &addr);
2062 }
2063
2064 /* caller must hold RTNL */
2065 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2066 {
2067         struct in6_addr addr;
2068
2069         if (ifp->prefix_len >= 127) /* RFC 6164 */
2070                 return;
2071         ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2072         if (ipv6_addr_any(&addr))
2073                 return;
2074         __ipv6_dev_ac_dec(ifp->idev, &addr);
2075 }
2076
2077 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2078 {
2079         switch (dev->addr_len) {
2080         case ETH_ALEN:
2081                 memcpy(eui, dev->dev_addr, 3);
2082                 eui[3] = 0xFF;
2083                 eui[4] = 0xFE;
2084                 memcpy(eui + 5, dev->dev_addr + 3, 3);
2085                 break;
2086         case EUI64_ADDR_LEN:
2087                 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2088                 eui[0] ^= 2;
2089                 break;
2090         default:
2091                 return -1;
2092         }
2093
2094         return 0;
2095 }
2096
2097 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2098 {
2099         union fwnet_hwaddr *ha;
2100
2101         if (dev->addr_len != FWNET_ALEN)
2102                 return -1;
2103
2104         ha = (union fwnet_hwaddr *)dev->dev_addr;
2105
2106         memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2107         eui[0] ^= 2;
2108         return 0;
2109 }
2110
2111 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2112 {
2113         /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2114         if (dev->addr_len != ARCNET_ALEN)
2115                 return -1;
2116         memset(eui, 0, 7);
2117         eui[7] = *(u8 *)dev->dev_addr;
2118         return 0;
2119 }
2120
2121 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2122 {
2123         if (dev->addr_len != INFINIBAND_ALEN)
2124                 return -1;
2125         memcpy(eui, dev->dev_addr + 12, 8);
2126         eui[0] |= 2;
2127         return 0;
2128 }
2129
2130 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2131 {
2132         if (addr == 0)
2133                 return -1;
2134         eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2135                   ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2136                   ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2137                   ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2138                   ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2139                   ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2140         eui[1] = 0;
2141         eui[2] = 0x5E;
2142         eui[3] = 0xFE;
2143         memcpy(eui + 4, &addr, 4);
2144         return 0;
2145 }
2146
2147 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2148 {
2149         if (dev->priv_flags & IFF_ISATAP)
2150                 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2151         return -1;
2152 }
2153
2154 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2155 {
2156         return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2157 }
2158
2159 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2160 {
2161         memcpy(eui, dev->perm_addr, 3);
2162         memcpy(eui + 5, dev->perm_addr + 3, 3);
2163         eui[3] = 0xFF;
2164         eui[4] = 0xFE;
2165         eui[0] ^= 2;
2166         return 0;
2167 }
2168
2169 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2170 {
2171         switch (dev->type) {
2172         case ARPHRD_ETHER:
2173         case ARPHRD_FDDI:
2174                 return addrconf_ifid_eui48(eui, dev);
2175         case ARPHRD_ARCNET:
2176                 return addrconf_ifid_arcnet(eui, dev);
2177         case ARPHRD_INFINIBAND:
2178                 return addrconf_ifid_infiniband(eui, dev);
2179         case ARPHRD_SIT:
2180                 return addrconf_ifid_sit(eui, dev);
2181         case ARPHRD_IPGRE:
2182         case ARPHRD_TUNNEL:
2183                 return addrconf_ifid_gre(eui, dev);
2184         case ARPHRD_6LOWPAN:
2185                 return addrconf_ifid_6lowpan(eui, dev);
2186         case ARPHRD_IEEE1394:
2187                 return addrconf_ifid_ieee1394(eui, dev);
2188         case ARPHRD_TUNNEL6:
2189         case ARPHRD_IP6GRE:
2190                 return addrconf_ifid_ip6tnl(eui, dev);
2191         }
2192         return -1;
2193 }
2194
2195 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2196 {
2197         int err = -1;
2198         struct inet6_ifaddr *ifp;
2199
2200         read_lock_bh(&idev->lock);
2201         list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2202                 if (ifp->scope > IFA_LINK)
2203                         break;
2204                 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2205                         memcpy(eui, ifp->addr.s6_addr+8, 8);
2206                         err = 0;
2207                         break;
2208                 }
2209         }
2210         read_unlock_bh(&idev->lock);
2211         return err;
2212 }
2213
2214 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2215 static void ipv6_regen_rndid(struct inet6_dev *idev)
2216 {
2217 regen:
2218         get_random_bytes(idev->rndid, sizeof(idev->rndid));
2219         idev->rndid[0] &= ~0x02;
2220
2221         /*
2222          * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2223          * check if generated address is not inappropriate
2224          *
2225          *  - Reserved subnet anycast (RFC 2526)
2226          *      11111101 11....11 1xxxxxxx
2227          *  - ISATAP (RFC4214) 6.1
2228          *      00-00-5E-FE-xx-xx-xx-xx
2229          *  - value 0
2230          *  - XXX: already assigned to an address on the device
2231          */
2232         if (idev->rndid[0] == 0xfd &&
2233             (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2234             (idev->rndid[7]&0x80))
2235                 goto regen;
2236         if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2237                 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2238                         goto regen;
2239                 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2240                         goto regen;
2241         }
2242 }
2243
2244 static void  ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2245 {
2246         if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2247                 ipv6_regen_rndid(idev);
2248 }
2249
2250 /*
2251  *      Add prefix route.
2252  */
2253
2254 static void
2255 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2256                       unsigned long expires, u32 flags)
2257 {
2258         struct fib6_config cfg = {
2259                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2260                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2261                 .fc_ifindex = dev->ifindex,
2262                 .fc_expires = expires,
2263                 .fc_dst_len = plen,
2264                 .fc_flags = RTF_UP | flags,
2265                 .fc_nlinfo.nl_net = dev_net(dev),
2266                 .fc_protocol = RTPROT_KERNEL,
2267         };
2268
2269         cfg.fc_dst = *pfx;
2270
2271         /* Prevent useless cloning on PtP SIT.
2272            This thing is done here expecting that the whole
2273            class of non-broadcast devices need not cloning.
2274          */
2275 #if IS_ENABLED(CONFIG_IPV6_SIT)
2276         if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2277                 cfg.fc_flags |= RTF_NONEXTHOP;
2278 #endif
2279
2280         ip6_route_add(&cfg);
2281 }
2282
2283
2284 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2285                                                   int plen,
2286                                                   const struct net_device *dev,
2287                                                   u32 flags, u32 noflags)
2288 {
2289         struct fib6_node *fn;
2290         struct rt6_info *rt = NULL;
2291         struct fib6_table *table;
2292         u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2293
2294         table = fib6_get_table(dev_net(dev), tb_id);
2295         if (!table)
2296                 return NULL;
2297
2298         read_lock_bh(&table->tb6_lock);
2299         fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2300         if (!fn)
2301                 goto out;
2302
2303         noflags |= RTF_CACHE;
2304         for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2305                 if (rt->dst.dev->ifindex != dev->ifindex)
2306                         continue;
2307                 if ((rt->rt6i_flags & flags) != flags)
2308                         continue;
2309                 if ((rt->rt6i_flags & noflags) != 0)
2310                         continue;
2311                 dst_hold(&rt->dst);
2312                 break;
2313         }
2314 out:
2315         read_unlock_bh(&table->tb6_lock);
2316         return rt;
2317 }
2318
2319
2320 /* Create "default" multicast route to the interface */
2321
2322 static void addrconf_add_mroute(struct net_device *dev)
2323 {
2324         struct fib6_config cfg = {
2325                 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2326                 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2327                 .fc_ifindex = dev->ifindex,
2328                 .fc_dst_len = 8,
2329                 .fc_flags = RTF_UP,
2330                 .fc_nlinfo.nl_net = dev_net(dev),
2331         };
2332
2333         ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2334
2335         ip6_route_add(&cfg);
2336 }
2337
2338 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2339 {
2340         struct inet6_dev *idev;
2341
2342         ASSERT_RTNL();
2343
2344         idev = ipv6_find_idev(dev);
2345         if (!idev)
2346                 return ERR_PTR(-ENOBUFS);
2347
2348         if (idev->cnf.disable_ipv6)
2349                 return ERR_PTR(-EACCES);
2350
2351         /* Add default multicast route */
2352         if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2353                 addrconf_add_mroute(dev);
2354
2355         return idev;
2356 }
2357
2358 static void manage_tempaddrs(struct inet6_dev *idev,
2359                              struct inet6_ifaddr *ifp,
2360                              __u32 valid_lft, __u32 prefered_lft,
2361                              bool create, unsigned long now)
2362 {
2363         u32 flags;
2364         struct inet6_ifaddr *ift;
2365
2366         read_lock_bh(&idev->lock);
2367         /* update all temporary addresses in the list */
2368         list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2369                 int age, max_valid, max_prefered;
2370
2371                 if (ifp != ift->ifpub)
2372                         continue;
2373
2374                 /* RFC 4941 section 3.3:
2375                  * If a received option will extend the lifetime of a public
2376                  * address, the lifetimes of temporary addresses should
2377                  * be extended, subject to the overall constraint that no
2378                  * temporary addresses should ever remain "valid" or "preferred"
2379                  * for a time longer than (TEMP_VALID_LIFETIME) or
2380                  * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2381                  */
2382                 age = (now - ift->cstamp) / HZ;
2383                 max_valid = idev->cnf.temp_valid_lft - age;
2384                 if (max_valid < 0)
2385                         max_valid = 0;
2386
2387                 max_prefered = idev->cnf.temp_prefered_lft -
2388                                idev->desync_factor - age;
2389                 if (max_prefered < 0)
2390                         max_prefered = 0;
2391
2392                 if (valid_lft > max_valid)
2393                         valid_lft = max_valid;
2394
2395                 if (prefered_lft > max_prefered)
2396                         prefered_lft = max_prefered;
2397
2398                 spin_lock(&ift->lock);
2399                 flags = ift->flags;
2400                 ift->valid_lft = valid_lft;
2401                 ift->prefered_lft = prefered_lft;
2402                 ift->tstamp = now;
2403                 if (prefered_lft > 0)
2404                         ift->flags &= ~IFA_F_DEPRECATED;
2405
2406                 spin_unlock(&ift->lock);
2407                 if (!(flags&IFA_F_TENTATIVE))
2408                         ipv6_ifa_notify(0, ift);
2409         }
2410
2411         if ((create || list_empty(&idev->tempaddr_list)) &&
2412             idev->cnf.use_tempaddr > 0) {
2413                 /* When a new public address is created as described
2414                  * in [ADDRCONF], also create a new temporary address.
2415                  * Also create a temporary address if it's enabled but
2416                  * no temporary address currently exists.
2417                  */
2418                 read_unlock_bh(&idev->lock);
2419                 ipv6_create_tempaddr(ifp, NULL);
2420         } else {
2421                 read_unlock_bh(&idev->lock);
2422         }
2423 }
2424
2425 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2426 {
2427         return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2428                idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2429 }
2430
2431 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2432                                  const struct prefix_info *pinfo,
2433                                  struct inet6_dev *in6_dev,
2434                                  const struct in6_addr *addr, int addr_type,
2435                                  u32 addr_flags, bool sllao, bool tokenized,
2436                                  __u32 valid_lft, u32 prefered_lft)
2437 {
2438         struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2439         int create = 0, update_lft = 0;
2440
2441         if (!ifp && valid_lft) {
2442                 int max_addresses = in6_dev->cnf.max_addresses;
2443
2444 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2445                 if (in6_dev->cnf.optimistic_dad &&
2446                     !net->ipv6.devconf_all->forwarding && sllao)
2447                         addr_flags |= IFA_F_OPTIMISTIC;
2448 #endif
2449
2450                 /* Do not allow to create too much of autoconfigured
2451                  * addresses; this would be too easy way to crash kernel.
2452                  */
2453                 if (!max_addresses ||
2454                     ipv6_count_addresses(in6_dev) < max_addresses)
2455                         ifp = ipv6_add_addr(in6_dev, addr, NULL,
2456                                             pinfo->prefix_len,
2457                                             addr_type&IPV6_ADDR_SCOPE_MASK,
2458                                             addr_flags, valid_lft,
2459                                             prefered_lft);
2460
2461                 if (IS_ERR_OR_NULL(ifp))
2462                         return -1;
2463
2464                 update_lft = 0;
2465                 create = 1;
2466                 spin_lock_bh(&ifp->lock);
2467                 ifp->flags |= IFA_F_MANAGETEMPADDR;
2468                 ifp->cstamp = jiffies;
2469                 ifp->tokenized = tokenized;
2470                 spin_unlock_bh(&ifp->lock);
2471                 addrconf_dad_start(ifp);
2472         }
2473
2474         if (ifp) {
2475                 u32 flags;
2476                 unsigned long now;
2477                 u32 stored_lft;
2478
2479                 /* update lifetime (RFC2462 5.5.3 e) */
2480                 spin_lock_bh(&ifp->lock);
2481                 now = jiffies;
2482                 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2483                         stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2484                 else
2485                         stored_lft = 0;
2486                 if (!update_lft && !create && stored_lft) {
2487                         const u32 minimum_lft = min_t(u32,
2488                                 stored_lft, MIN_VALID_LIFETIME);
2489                         valid_lft = max(valid_lft, minimum_lft);
2490
2491                         /* RFC4862 Section 5.5.3e:
2492                          * "Note that the preferred lifetime of the
2493                          *  corresponding address is always reset to
2494                          *  the Preferred Lifetime in the received
2495                          *  Prefix Information option, regardless of
2496                          *  whether the valid lifetime is also reset or
2497                          *  ignored."
2498                          *
2499                          * So we should always update prefered_lft here.
2500                          */
2501                         update_lft = 1;
2502                 }
2503
2504                 if (update_lft) {
2505                         ifp->valid_lft = valid_lft;
2506                         ifp->prefered_lft = prefered_lft;
2507                         ifp->tstamp = now;
2508                         flags = ifp->flags;
2509                         ifp->flags &= ~IFA_F_DEPRECATED;
2510                         spin_unlock_bh(&ifp->lock);
2511
2512                         if (!(flags&IFA_F_TENTATIVE))
2513                                 ipv6_ifa_notify(0, ifp);
2514                 } else
2515                         spin_unlock_bh(&ifp->lock);
2516
2517                 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2518                                  create, now);
2519
2520                 in6_ifa_put(ifp);
2521                 addrconf_verify();
2522         }
2523
2524         return 0;
2525 }
2526 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2527
2528 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2529 {
2530         struct prefix_info *pinfo;
2531         __u32 valid_lft;
2532         __u32 prefered_lft;
2533         int addr_type, err;
2534         u32 addr_flags = 0;
2535         struct inet6_dev *in6_dev;
2536         struct net *net = dev_net(dev);
2537
2538         pinfo = (struct prefix_info *) opt;
2539
2540         if (len < sizeof(struct prefix_info)) {
2541                 ADBG("addrconf: prefix option too short\n");
2542                 return;
2543         }
2544
2545         /*
2546          *      Validation checks ([ADDRCONF], page 19)
2547          */
2548
2549         addr_type = ipv6_addr_type(&pinfo->prefix);
2550
2551         if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2552                 return;
2553
2554         valid_lft = ntohl(pinfo->valid);
2555         prefered_lft = ntohl(pinfo->prefered);
2556
2557         if (prefered_lft > valid_lft) {
2558                 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2559                 return;
2560         }
2561
2562         in6_dev = in6_dev_get(dev);
2563
2564         if (!in6_dev) {
2565                 net_dbg_ratelimited("addrconf: device %s not configured\n",
2566                                     dev->name);
2567                 return;
2568         }
2569
2570         /*
2571          *      Two things going on here:
2572          *      1) Add routes for on-link prefixes
2573          *      2) Configure prefixes with the auto flag set
2574          */
2575
2576         if (pinfo->onlink) {
2577                 struct rt6_info *rt;
2578                 unsigned long rt_expires;
2579
2580                 /* Avoid arithmetic overflow. Really, we could
2581                  * save rt_expires in seconds, likely valid_lft,
2582                  * but it would require division in fib gc, that it
2583                  * not good.
2584                  */
2585                 if (HZ > USER_HZ)
2586                         rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2587                 else
2588                         rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2589
2590                 if (addrconf_finite_timeout(rt_expires))
2591                         rt_expires *= HZ;
2592
2593                 rt = addrconf_get_prefix_route(&pinfo->prefix,
2594                                                pinfo->prefix_len,
2595                                                dev,
2596                                                RTF_ADDRCONF | RTF_PREFIX_RT,
2597                                                RTF_GATEWAY | RTF_DEFAULT);
2598
2599                 if (rt) {
2600                         /* Autoconf prefix route */
2601                         if (valid_lft == 0) {
2602                                 ip6_del_rt(rt);
2603                                 rt = NULL;
2604                         } else if (addrconf_finite_timeout(rt_expires)) {
2605                                 /* not infinity */
2606                                 rt6_set_expires(rt, jiffies + rt_expires);
2607                         } else {
2608                                 rt6_clean_expires(rt);
2609                         }
2610                 } else if (valid_lft) {
2611                         clock_t expires = 0;
2612                         int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2613                         if (addrconf_finite_timeout(rt_expires)) {
2614                                 /* not infinity */
2615                                 flags |= RTF_EXPIRES;
2616                                 expires = jiffies_to_clock_t(rt_expires);
2617                         }
2618                         addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2619                                               dev, expires, flags);
2620                 }
2621                 ip6_rt_put(rt);
2622         }
2623
2624         /* Try to figure out our local address for this prefix */
2625
2626         if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2627                 struct in6_addr addr;
2628                 bool tokenized = false, dev_addr_generated = false;
2629
2630                 if (pinfo->prefix_len == 64) {
2631                         memcpy(&addr, &pinfo->prefix, 8);
2632
2633                         if (!ipv6_addr_any(&in6_dev->token)) {
2634                                 read_lock_bh(&in6_dev->lock);
2635                                 memcpy(addr.s6_addr + 8,
2636                                        in6_dev->token.s6_addr + 8, 8);
2637                                 read_unlock_bh(&in6_dev->lock);
2638                                 tokenized = true;
2639                         } else if (is_addr_mode_generate_stable(in6_dev) &&
2640                                    !ipv6_generate_stable_address(&addr, 0,
2641                                                                  in6_dev)) {
2642                                 addr_flags |= IFA_F_STABLE_PRIVACY;
2643                                 goto ok;
2644                         } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2645                                    ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2646                                 goto put;
2647                         } else {
2648                                 dev_addr_generated = true;
2649                         }
2650                         goto ok;
2651                 }
2652                 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2653                                     pinfo->prefix_len);
2654                 goto put;
2655
2656 ok:
2657                 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2658                                                    &addr, addr_type,
2659                                                    addr_flags, sllao,
2660                                                    tokenized, valid_lft,
2661                                                    prefered_lft);
2662                 if (err)
2663                         goto put;
2664
2665                 /* Ignore error case here because previous prefix add addr was
2666                  * successful which will be notified.
2667                  */
2668                 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2669                                               addr_type, addr_flags, sllao,
2670                                               tokenized, valid_lft,
2671                                               prefered_lft,
2672                                               dev_addr_generated);
2673         }
2674         inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2675 put:
2676         in6_dev_put(in6_dev);
2677 }
2678
2679 /*
2680  *      Set destination address.
2681  *      Special case for SIT interfaces where we create a new "virtual"
2682  *      device.
2683  */
2684 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2685 {
2686         struct in6_ifreq ireq;
2687         struct net_device *dev;
2688         int err = -EINVAL;
2689
2690         rtnl_lock();
2691
2692         err = -EFAULT;
2693         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2694                 goto err_exit;
2695
2696         dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2697
2698         err = -ENODEV;
2699         if (!dev)
2700                 goto err_exit;
2701
2702 #if IS_ENABLED(CONFIG_IPV6_SIT)
2703         if (dev->type == ARPHRD_SIT) {
2704                 const struct net_device_ops *ops = dev->netdev_ops;
2705                 struct ifreq ifr;
2706                 struct ip_tunnel_parm p;
2707
2708                 err = -EADDRNOTAVAIL;
2709                 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2710                         goto err_exit;
2711
2712                 memset(&p, 0, sizeof(p));
2713                 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2714                 p.iph.saddr = 0;
2715                 p.iph.version = 4;
2716                 p.iph.ihl = 5;
2717                 p.iph.protocol = IPPROTO_IPV6;
2718                 p.iph.ttl = 64;
2719                 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2720
2721                 if (ops->ndo_do_ioctl) {
2722                         mm_segment_t oldfs = get_fs();
2723
2724                         set_fs(KERNEL_DS);
2725                         err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2726                         set_fs(oldfs);
2727                 } else
2728                         err = -EOPNOTSUPP;
2729
2730                 if (err == 0) {
2731                         err = -ENOBUFS;
2732                         dev = __dev_get_by_name(net, p.name);
2733                         if (!dev)
2734                                 goto err_exit;
2735                         err = dev_open(dev);
2736                 }
2737         }
2738 #endif
2739
2740 err_exit:
2741         rtnl_unlock();
2742         return err;
2743 }
2744
2745 static int ipv6_mc_config(struct sock *sk, bool join,
2746                           const struct in6_addr *addr, int ifindex)
2747 {
2748         int ret;
2749
2750         ASSERT_RTNL();
2751
2752         lock_sock(sk);
2753         if (join)
2754                 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2755         else
2756                 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2757         release_sock(sk);
2758
2759         return ret;
2760 }
2761
2762 /*
2763  *      Manual configuration of address on an interface
2764  */
2765 static int inet6_addr_add(struct net *net, int ifindex,
2766                           const struct in6_addr *pfx,
2767                           const struct in6_addr *peer_pfx,
2768                           unsigned int plen, __u32 ifa_flags,
2769                           __u32 prefered_lft, __u32 valid_lft)
2770 {
2771         struct inet6_ifaddr *ifp;
2772         struct inet6_dev *idev;
2773         struct net_device *dev;
2774         unsigned long timeout;
2775         clock_t expires;
2776         int scope;
2777         u32 flags;
2778
2779         ASSERT_RTNL();
2780
2781         if (plen > 128)
2782                 return -EINVAL;
2783
2784         /* check the lifetime */
2785         if (!valid_lft || prefered_lft > valid_lft)
2786                 return -EINVAL;
2787
2788         if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2789                 return -EINVAL;
2790
2791         dev = __dev_get_by_index(net, ifindex);
2792         if (!dev)
2793                 return -ENODEV;
2794
2795         idev = addrconf_add_dev(dev);
2796         if (IS_ERR(idev))
2797                 return PTR_ERR(idev);
2798
2799         if (ifa_flags & IFA_F_MCAUTOJOIN) {
2800                 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2801                                          true, pfx, ifindex);
2802
2803                 if (ret < 0)
2804                         return ret;
2805         }
2806
2807         scope = ipv6_addr_scope(pfx);
2808
2809         timeout = addrconf_timeout_fixup(valid_lft, HZ);
2810         if (addrconf_finite_timeout(timeout)) {
2811                 expires = jiffies_to_clock_t(timeout * HZ);
2812                 valid_lft = timeout;
2813                 flags = RTF_EXPIRES;
2814         } else {
2815                 expires = 0;
2816                 flags = 0;
2817                 ifa_flags |= IFA_F_PERMANENT;
2818         }
2819
2820         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2821         if (addrconf_finite_timeout(timeout)) {
2822                 if (timeout == 0)
2823                         ifa_flags |= IFA_F_DEPRECATED;
2824                 prefered_lft = timeout;
2825         }
2826
2827         ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2828                             valid_lft, prefered_lft);
2829
2830         if (!IS_ERR(ifp)) {
2831                 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2832                         addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2833                                               expires, flags);
2834                 }
2835
2836                 /*
2837                  * Note that section 3.1 of RFC 4429 indicates
2838                  * that the Optimistic flag should not be set for
2839                  * manually configured addresses
2840                  */
2841                 addrconf_dad_start(ifp);
2842                 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2843                         manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2844                                          true, jiffies);
2845                 in6_ifa_put(ifp);
2846                 addrconf_verify_rtnl();
2847                 return 0;
2848         } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2849                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2850                                false, pfx, ifindex);
2851         }
2852
2853         return PTR_ERR(ifp);
2854 }
2855
2856 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2857                           const struct in6_addr *pfx, unsigned int plen)
2858 {
2859         struct inet6_ifaddr *ifp;
2860         struct inet6_dev *idev;
2861         struct net_device *dev;
2862
2863         if (plen > 128)
2864                 return -EINVAL;
2865
2866         dev = __dev_get_by_index(net, ifindex);
2867         if (!dev)
2868                 return -ENODEV;
2869
2870         idev = __in6_dev_get(dev);
2871         if (!idev)
2872                 return -ENXIO;
2873
2874         read_lock_bh(&idev->lock);
2875         list_for_each_entry(ifp, &idev->addr_list, if_list) {
2876                 if (ifp->prefix_len == plen &&
2877                     ipv6_addr_equal(pfx, &ifp->addr)) {
2878                         in6_ifa_hold(ifp);
2879                         read_unlock_bh(&idev->lock);
2880
2881                         if (!(ifp->flags & IFA_F_TEMPORARY) &&
2882                             (ifa_flags & IFA_F_MANAGETEMPADDR))
2883                                 manage_tempaddrs(idev, ifp, 0, 0, false,
2884                                                  jiffies);
2885                         ipv6_del_addr(ifp);
2886                         addrconf_verify_rtnl();
2887                         if (ipv6_addr_is_multicast(pfx)) {
2888                                 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2889                                                false, pfx, dev->ifindex);
2890                         }
2891                         return 0;
2892                 }
2893         }
2894         read_unlock_bh(&idev->lock);
2895         return -EADDRNOTAVAIL;
2896 }
2897
2898
2899 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2900 {
2901         struct in6_ifreq ireq;
2902         int err;
2903
2904         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2905                 return -EPERM;
2906
2907         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2908                 return -EFAULT;
2909
2910         rtnl_lock();
2911         err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2912                              ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2913                              INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2914         rtnl_unlock();
2915         return err;
2916 }
2917
2918 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2919 {
2920         struct in6_ifreq ireq;
2921         int err;
2922
2923         if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2924                 return -EPERM;
2925
2926         if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2927                 return -EFAULT;
2928
2929         rtnl_lock();
2930         err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2931                              ireq.ifr6_prefixlen);
2932         rtnl_unlock();
2933         return err;
2934 }
2935
2936 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2937                      int plen, int scope)
2938 {
2939         struct inet6_ifaddr *ifp;
2940
2941         ifp = ipv6_add_addr(idev, addr, NULL, plen,
2942                             scope, IFA_F_PERMANENT,
2943                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2944         if (!IS_ERR(ifp)) {
2945                 spin_lock_bh(&ifp->lock);
2946                 ifp->flags &= ~IFA_F_TENTATIVE;
2947                 spin_unlock_bh(&ifp->lock);
2948                 rt_genid_bump_ipv6(dev_net(idev->dev));
2949                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2950                 in6_ifa_put(ifp);
2951         }
2952 }
2953
2954 #if IS_ENABLED(CONFIG_IPV6_SIT)
2955 static void sit_add_v4_addrs(struct inet6_dev *idev)
2956 {
2957         struct in6_addr addr;
2958         struct net_device *dev;
2959         struct net *net = dev_net(idev->dev);
2960         int scope, plen;
2961         u32 pflags = 0;
2962
2963         ASSERT_RTNL();
2964
2965         memset(&addr, 0, sizeof(struct in6_addr));
2966         memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2967
2968         if (idev->dev->flags&IFF_POINTOPOINT) {
2969                 addr.s6_addr32[0] = htonl(0xfe800000);
2970                 scope = IFA_LINK;
2971                 plen = 64;
2972         } else {
2973                 scope = IPV6_ADDR_COMPATv4;
2974                 plen = 96;
2975                 pflags |= RTF_NONEXTHOP;
2976         }
2977
2978         if (addr.s6_addr32[3]) {
2979                 add_addr(idev, &addr, plen, scope);
2980                 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2981                 return;
2982         }
2983
2984         for_each_netdev(net, dev) {
2985                 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2986                 if (in_dev && (dev->flags & IFF_UP)) {
2987                         struct in_ifaddr *ifa;
2988
2989                         int flag = scope;
2990
2991                         for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2992
2993                                 addr.s6_addr32[3] = ifa->ifa_local;
2994
2995                                 if (ifa->ifa_scope == RT_SCOPE_LINK)
2996                                         continue;
2997                                 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2998                                         if (idev->dev->flags&IFF_POINTOPOINT)
2999                                                 continue;
3000                                         flag |= IFA_HOST;
3001                                 }
3002
3003                                 add_addr(idev, &addr, plen, flag);
3004                                 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3005                                                       pflags);
3006                         }
3007                 }
3008         }
3009 }
3010 #endif
3011
3012 static void init_loopback(struct net_device *dev)
3013 {
3014         struct inet6_dev  *idev;
3015         struct net_device *sp_dev;
3016         struct inet6_ifaddr *sp_ifa;
3017         struct rt6_info *sp_rt;
3018
3019         /* ::1 */
3020
3021         ASSERT_RTNL();
3022
3023         idev = ipv6_find_idev(dev);
3024         if (!idev) {
3025                 pr_debug("%s: add_dev failed\n", __func__);
3026                 return;
3027         }
3028
3029         add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3030
3031         /* Add routes to other interface's IPv6 addresses */
3032         for_each_netdev(dev_net(dev), sp_dev) {
3033                 if (!strcmp(sp_dev->name, dev->name))
3034                         continue;
3035
3036                 idev = __in6_dev_get(sp_dev);
3037                 if (!idev)
3038                         continue;
3039
3040                 read_lock_bh(&idev->lock);
3041                 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3042
3043                         if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3044                                 continue;
3045
3046                         if (sp_ifa->rt) {
3047                                 /* This dst has been added to garbage list when
3048                                  * lo device down, release this obsolete dst and
3049                                  * reallocate a new router for ifa.
3050                                  */
3051                                 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
3052                                         ip6_rt_put(sp_ifa->rt);
3053                                         sp_ifa->rt = NULL;
3054                                 } else {
3055                                         continue;
3056                                 }
3057                         }
3058
3059                         sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3060
3061                         /* Failure cases are ignored */
3062                         if (!IS_ERR(sp_rt)) {
3063                                 sp_ifa->rt = sp_rt;
3064                                 ip6_ins_rt(sp_rt);
3065                         }
3066                 }
3067                 read_unlock_bh(&idev->lock);
3068         }
3069 }
3070
3071 void addrconf_add_linklocal(struct inet6_dev *idev,
3072                             const struct in6_addr *addr, u32 flags)
3073 {
3074         struct inet6_ifaddr *ifp;
3075         u32 addr_flags = flags | IFA_F_PERMANENT;
3076
3077 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3078         if (idev->cnf.optimistic_dad &&
3079             !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3080                 addr_flags |= IFA_F_OPTIMISTIC;
3081 #endif
3082
3083         ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3084                             INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3085         if (!IS_ERR(ifp)) {
3086                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3087                 addrconf_dad_start(ifp);
3088                 in6_ifa_put(ifp);
3089         }
3090 }
3091 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3092
3093 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3094 {
3095         if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3096                 return true;
3097
3098         if (address.s6_addr32[2] == htonl(0x02005eff) &&
3099             ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3100                 return true;
3101
3102         if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3103             ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3104                 return true;
3105
3106         return false;
3107 }
3108
3109 static int ipv6_generate_stable_address(struct in6_addr *address,
3110                                         u8 dad_count,
3111                                         const struct inet6_dev *idev)
3112 {
3113         static DEFINE_SPINLOCK(lock);
3114         static __u32 digest[SHA_DIGEST_WORDS];
3115         static __u32 workspace[SHA_WORKSPACE_WORDS];
3116
3117         static union {
3118                 char __data[SHA_MESSAGE_BYTES];
3119                 struct {
3120                         struct in6_addr secret;
3121                         __be32 prefix[2];
3122                         unsigned char hwaddr[MAX_ADDR_LEN];
3123                         u8 dad_count;
3124                 } __packed;
3125         } data;
3126
3127         struct in6_addr secret;
3128         struct in6_addr temp;
3129         struct net *net = dev_net(idev->dev);
3130
3131         BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3132
3133         if (idev->cnf.stable_secret.initialized)
3134                 secret = idev->cnf.stable_secret.secret;
3135         else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3136                 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3137         else
3138                 return -1;
3139
3140 retry:
3141         spin_lock_bh(&lock);
3142
3143         sha_init(digest);
3144         memset(&data, 0, sizeof(data));
3145         memset(workspace, 0, sizeof(workspace));
3146         memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3147         data.prefix[0] = address->s6_addr32[0];
3148         data.prefix[1] = address->s6_addr32[1];
3149         data.secret = secret;
3150         data.dad_count = dad_count;
3151
3152         sha_transform(digest, data.__data, workspace);
3153
3154         temp = *address;
3155         temp.s6_addr32[2] = (__force __be32)digest[0];
3156         temp.s6_addr32[3] = (__force __be32)digest[1];
3157
3158         spin_unlock_bh(&lock);
3159
3160         if (ipv6_reserved_interfaceid(temp)) {
3161                 dad_count++;
3162                 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3163                         return -1;
3164                 goto retry;
3165         }
3166
3167         *address = temp;
3168         return 0;
3169 }
3170
3171 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3172 {
3173         struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3174
3175         if (s->initialized)
3176                 return;
3177         s = &idev->cnf.stable_secret;
3178         get_random_bytes(&s->secret, sizeof(s->secret));
3179         s->initialized = true;
3180 }
3181
3182 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3183 {
3184         struct in6_addr addr;
3185
3186         /* no link local addresses on L3 master devices */
3187         if (netif_is_l3_master(idev->dev))
3188                 return;
3189
3190         ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3191
3192         switch (idev->cnf.addr_gen_mode) {
3193         case IN6_ADDR_GEN_MODE_RANDOM:
3194                 ipv6_gen_mode_random_init(idev);
3195                 /* fallthrough */
3196         case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3197                 if (!ipv6_generate_stable_address(&addr, 0, idev))
3198                         addrconf_add_linklocal(idev, &addr,
3199                                                IFA_F_STABLE_PRIVACY);
3200                 else if (prefix_route)
3201                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3202                 break;
3203         case IN6_ADDR_GEN_MODE_EUI64:
3204                 /* addrconf_add_linklocal also adds a prefix_route and we
3205                  * only need to care about prefix routes if ipv6_generate_eui64
3206                  * couldn't generate one.
3207                  */
3208                 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3209                         addrconf_add_linklocal(idev, &addr, 0);
3210                 else if (prefix_route)
3211                         addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3212                 break;
3213         case IN6_ADDR_GEN_MODE_NONE:
3214         default:
3215                 /* will not add any link local address */
3216                 break;
3217         }
3218 }
3219
3220 static void addrconf_dev_config(struct net_device *dev)
3221 {
3222         struct inet6_dev *idev;
3223
3224         ASSERT_RTNL();
3225
3226         if ((dev->type != ARPHRD_ETHER) &&
3227             (dev->type != ARPHRD_FDDI) &&
3228             (dev->type != ARPHRD_ARCNET) &&
3229             (dev->type != ARPHRD_INFINIBAND) &&
3230             (dev->type != ARPHRD_IEEE1394) &&
3231             (dev->type != ARPHRD_TUNNEL6) &&
3232             (dev->type != ARPHRD_6LOWPAN) &&
3233             (dev->type != ARPHRD_IP6GRE) &&
3234             (dev->type != ARPHRD_IPGRE) &&
3235             (dev->type != ARPHRD_TUNNEL) &&
3236             (dev->type != ARPHRD_NONE)) {
3237                 /* Alas, we support only Ethernet autoconfiguration. */
3238                 return;
3239         }
3240
3241         idev = addrconf_add_dev(dev);
3242         if (IS_ERR(idev))
3243                 return;
3244
3245         /* this device type has no EUI support */
3246         if (dev->type == ARPHRD_NONE &&
3247             idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3248                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3249
3250         addrconf_addr_gen(idev, false);
3251 }
3252
3253 #if IS_ENABLED(CONFIG_IPV6_SIT)
3254 static void addrconf_sit_config(struct net_device *dev)
3255 {
3256         struct inet6_dev *idev;
3257
3258         ASSERT_RTNL();
3259
3260         /*
3261          * Configure the tunnel with one of our IPv4
3262          * addresses... we should configure all of
3263          * our v4 addrs in the tunnel
3264          */
3265
3266         idev = ipv6_find_idev(dev);
3267         if (!idev) {
3268                 pr_debug("%s: add_dev failed\n", __func__);
3269                 return;
3270         }
3271
3272         if (dev->priv_flags & IFF_ISATAP) {
3273                 addrconf_addr_gen(idev, false);
3274                 return;
3275         }
3276
3277         sit_add_v4_addrs(idev);
3278
3279         if (dev->flags&IFF_POINTOPOINT)
3280                 addrconf_add_mroute(dev);
3281 }
3282 #endif
3283
3284 #if IS_ENABLED(CONFIG_NET_IPGRE)
3285 static void addrconf_gre_config(struct net_device *dev)
3286 {
3287         struct inet6_dev *idev;
3288
3289         ASSERT_RTNL();
3290
3291         idev = ipv6_find_idev(dev);
3292         if (!idev) {
3293                 pr_debug("%s: add_dev failed\n", __func__);
3294                 return;
3295         }
3296
3297         addrconf_addr_gen(idev, true);
3298         if (dev->flags & IFF_POINTOPOINT)
3299                 addrconf_add_mroute(dev);
3300 }
3301 #endif
3302
3303 static int fixup_permanent_addr(struct inet6_dev *idev,
3304                                 struct inet6_ifaddr *ifp)
3305 {
3306         if (!ifp->rt) {
3307                 struct rt6_info *rt;
3308
3309                 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3310                 if (unlikely(IS_ERR(rt)))
3311                         return PTR_ERR(rt);
3312
3313                 ifp->rt = rt;
3314         }
3315
3316         if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3317                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3318                                       idev->dev, 0, 0);
3319         }
3320
3321         addrconf_dad_start(ifp);
3322
3323         return 0;
3324 }
3325
3326 static void addrconf_permanent_addr(struct net_device *dev)
3327 {
3328         struct inet6_ifaddr *ifp, *tmp;
3329         struct inet6_dev *idev;
3330
3331         idev = __in6_dev_get(dev);
3332         if (!idev)
3333                 return;
3334
3335         write_lock_bh(&idev->lock);
3336
3337         list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3338                 if ((ifp->flags & IFA_F_PERMANENT) &&
3339                     fixup_permanent_addr(idev, ifp) < 0) {
3340                         write_unlock_bh(&idev->lock);
3341                         ipv6_del_addr(ifp);
3342                         write_lock_bh(&idev->lock);
3343
3344                         net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3345                                              idev->dev->name, &ifp->addr);
3346                 }
3347         }
3348
3349         write_unlock_bh(&idev->lock);
3350 }
3351
3352 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3353                            void *ptr)
3354 {
3355         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3356         struct netdev_notifier_changeupper_info *info;
3357         struct inet6_dev *idev = __in6_dev_get(dev);
3358         int run_pending = 0;
3359         int err;
3360
3361         switch (event) {
3362         case NETDEV_REGISTER:
3363                 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3364                         idev = ipv6_add_dev(dev);
3365                         if (IS_ERR(idev))
3366                                 return notifier_from_errno(PTR_ERR(idev));
3367                 }
3368                 break;
3369
3370         case NETDEV_CHANGEMTU:
3371                 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3372                 if (dev->mtu < IPV6_MIN_MTU) {
3373                         addrconf_ifdown(dev, 1);
3374                         break;
3375                 }
3376
3377                 if (idev) {
3378                         rt6_mtu_change(dev, dev->mtu);
3379                         idev->cnf.mtu6 = dev->mtu;
3380                         break;
3381                 }
3382
3383                 /* allocate new idev */
3384                 idev = ipv6_add_dev(dev);
3385                 if (IS_ERR(idev))
3386                         break;
3387
3388                 /* device is still not ready */
3389                 if (!(idev->if_flags & IF_READY))
3390                         break;
3391
3392                 run_pending = 1;
3393
3394                 /* fall through */
3395
3396         case NETDEV_UP:
3397         case NETDEV_CHANGE:
3398                 if (dev->flags & IFF_SLAVE)
3399                         break;
3400
3401                 if (idev && idev->cnf.disable_ipv6)
3402                         break;
3403
3404                 if (event == NETDEV_UP) {
3405                         /* restore routes for permanent addresses */
3406                         addrconf_permanent_addr(dev);
3407
3408                         if (!addrconf_qdisc_ok(dev)) {
3409                                 /* device is not ready yet. */
3410                                 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3411                                         dev->name);
3412                                 break;
3413                         }
3414
3415                         if (!idev && dev->mtu >= IPV6_MIN_MTU)
3416                                 idev = ipv6_add_dev(dev);
3417
3418                         if (!IS_ERR_OR_NULL(idev)) {
3419                                 idev->if_flags |= IF_READY;
3420                                 run_pending = 1;
3421                         }
3422                 } else if (event == NETDEV_CHANGE) {
3423                         if (!addrconf_qdisc_ok(dev)) {
3424                                 /* device is still not ready. */
3425                                 break;
3426                         }
3427
3428                         if (idev) {
3429                                 if (idev->if_flags & IF_READY) {
3430                                         /* device is already configured -
3431                                          * but resend MLD reports, we might
3432                                          * have roamed and need to update
3433                                          * multicast snooping switches
3434                                          */
3435                                         ipv6_mc_up(idev);
3436                                         break;
3437                                 }
3438                                 idev->if_flags |= IF_READY;
3439                         }
3440
3441                         pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3442                                 dev->name);
3443
3444                         run_pending = 1;
3445                 }
3446
3447                 switch (dev->type) {
3448 #if IS_ENABLED(CONFIG_IPV6_SIT)
3449                 case ARPHRD_SIT:
3450                         addrconf_sit_config(dev);
3451                         break;
3452 #endif
3453 #if IS_ENABLED(CONFIG_NET_IPGRE)
3454                 case ARPHRD_IPGRE:
3455                         addrconf_gre_config(dev);
3456                         break;
3457 #endif
3458                 case ARPHRD_LOOPBACK:
3459                         init_loopback(dev);
3460                         break;
3461
3462                 default:
3463                         addrconf_dev_config(dev);
3464                         break;
3465                 }
3466
3467                 if (!IS_ERR_OR_NULL(idev)) {
3468                         if (run_pending)
3469                                 addrconf_dad_run(idev);
3470
3471                         /*
3472                          * If the MTU changed during the interface down,
3473                          * when the interface up, the changed MTU must be
3474                          * reflected in the idev as well as routers.
3475                          */
3476                         if (idev->cnf.mtu6 != dev->mtu &&
3477                             dev->mtu >= IPV6_MIN_MTU) {
3478                                 rt6_mtu_change(dev, dev->mtu);
3479                                 idev->cnf.mtu6 = dev->mtu;
3480                         }
3481                         idev->tstamp = jiffies;
3482                         inet6_ifinfo_notify(RTM_NEWLINK, idev);
3483
3484                         /*
3485                          * If the changed mtu during down is lower than
3486                          * IPV6_MIN_MTU stop IPv6 on this interface.
3487                          */
3488                         if (dev->mtu < IPV6_MIN_MTU)
3489                                 addrconf_ifdown(dev, 1);
3490                 }
3491                 break;
3492
3493         case NETDEV_DOWN:
3494         case NETDEV_UNREGISTER:
3495                 /*
3496                  *      Remove all addresses from this interface.
3497                  */
3498                 addrconf_ifdown(dev, event != NETDEV_DOWN);
3499                 break;
3500
3501         case NETDEV_CHANGENAME:
3502                 if (idev) {
3503                         snmp6_unregister_dev(idev);
3504                         addrconf_sysctl_unregister(idev);
3505                         err = addrconf_sysctl_register(idev);
3506                         if (err)
3507                                 return notifier_from_errno(err);
3508                         err = snmp6_register_dev(idev);
3509                         if (err) {
3510                                 addrconf_sysctl_unregister(idev);
3511                                 return notifier_from_errno(err);
3512                         }
3513                 }
3514                 break;
3515
3516         case NETDEV_PRE_TYPE_CHANGE:
3517         case NETDEV_POST_TYPE_CHANGE:
3518                 if (idev)
3519                         addrconf_type_change(dev, event);
3520                 break;
3521
3522         case NETDEV_CHANGEUPPER:
3523                 info = ptr;
3524
3525                 /* flush all routes if dev is linked to or unlinked from
3526                  * an L3 master device (e.g., VRF)
3527                  */
3528                 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3529                         addrconf_ifdown(dev, 0);
3530         }
3531
3532         return NOTIFY_OK;
3533 }
3534
3535 /*
3536  *      addrconf module should be notified of a device going up
3537  */
3538 static struct notifier_block ipv6_dev_notf = {
3539         .notifier_call = addrconf_notify,
3540 };
3541
3542 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3543 {
3544         struct inet6_dev *idev;
3545         ASSERT_RTNL();
3546
3547         idev = __in6_dev_get(dev);
3548
3549         if (event == NETDEV_POST_TYPE_CHANGE)
3550                 ipv6_mc_remap(idev);
3551         else if (event == NETDEV_PRE_TYPE_CHANGE)
3552                 ipv6_mc_unmap(idev);
3553 }
3554
3555 static bool addr_is_local(const struct in6_addr *addr)
3556 {
3557         return ipv6_addr_type(addr) &
3558                 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3559 }
3560
3561 static int addrconf_ifdown(struct net_device *dev, int how)
3562 {
3563         struct net *net = dev_net(dev);
3564         struct inet6_dev *idev;
3565         struct inet6_ifaddr *ifa, *tmp;
3566         struct list_head del_list;
3567         int _keep_addr;
3568         bool keep_addr;
3569         int state, i;
3570
3571         ASSERT_RTNL();
3572
3573         rt6_ifdown(net, dev);
3574         neigh_ifdown(&nd_tbl, dev);
3575
3576         idev = __in6_dev_get(dev);
3577         if (!idev)
3578                 return -ENODEV;
3579
3580         /*
3581          * Step 1: remove reference to ipv6 device from parent device.
3582          *         Do not dev_put!
3583          */
3584         if (how) {
3585                 idev->dead = 1;
3586
3587                 /* protected by rtnl_lock */
3588                 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3589
3590                 /* Step 1.5: remove snmp6 entry */
3591                 snmp6_unregister_dev(idev);
3592
3593         }
3594
3595         /* aggregate the system setting and interface setting */
3596         _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3597         if (!_keep_addr)
3598                 _keep_addr = idev->cnf.keep_addr_on_down;
3599
3600         /* combine the user config with event to determine if permanent
3601          * addresses are to be removed from address hash table
3602          */
3603         keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3604
3605         /* Step 2: clear hash table */
3606         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3607                 struct hlist_head *h = &inet6_addr_lst[i];
3608
3609                 spin_lock_bh(&addrconf_hash_lock);
3610 restart:
3611                 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3612                         if (ifa->idev == idev) {
3613                                 addrconf_del_dad_work(ifa);
3614                                 /* combined flag + permanent flag decide if
3615                                  * address is retained on a down event
3616                                  */
3617                                 if (!keep_addr ||
3618                                     !(ifa->flags & IFA_F_PERMANENT) ||
3619                                     addr_is_local(&ifa->addr)) {
3620                                         hlist_del_init_rcu(&ifa->addr_lst);
3621                                         goto restart;
3622                                 }
3623                         }
3624                 }
3625                 spin_unlock_bh(&addrconf_hash_lock);
3626         }
3627
3628         write_lock_bh(&idev->lock);
3629
3630         addrconf_del_rs_timer(idev);
3631
3632         /* Step 2: clear flags for stateless addrconf */
3633         if (!how)
3634                 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3635
3636         /* Step 3: clear tempaddr list */
3637         while (!list_empty(&idev->tempaddr_list)) {
3638                 ifa = list_first_entry(&idev->tempaddr_list,
3639                                        struct inet6_ifaddr, tmp_list);
3640                 list_del(&ifa->tmp_list);
3641                 write_unlock_bh(&idev->lock);
3642                 spin_lock_bh(&ifa->lock);
3643
3644                 if (ifa->ifpub) {
3645                         in6_ifa_put(ifa->ifpub);
3646                         ifa->ifpub = NULL;
3647                 }
3648                 spin_unlock_bh(&ifa->lock);
3649                 in6_ifa_put(ifa);
3650                 write_lock_bh(&idev->lock);
3651         }
3652
3653         /* re-combine the user config with event to determine if permanent
3654          * addresses are to be removed from the interface list
3655          */
3656         keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3657
3658         INIT_LIST_HEAD(&del_list);
3659         list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3660                 struct rt6_info *rt = NULL;
3661                 bool keep;
3662
3663                 addrconf_del_dad_work(ifa);
3664
3665                 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3666                         !addr_is_local(&ifa->addr);
3667                 if (!keep)
3668                         list_move(&ifa->if_list, &del_list);
3669
3670                 write_unlock_bh(&idev->lock);
3671                 spin_lock_bh(&ifa->lock);
3672
3673                 if (keep) {
3674                         /* set state to skip the notifier below */
3675                         state = INET6_IFADDR_STATE_DEAD;
3676                         ifa->state = 0;
3677                         if (!(ifa->flags & IFA_F_NODAD))
3678                                 ifa->flags |= IFA_F_TENTATIVE;
3679
3680                         rt = ifa->rt;
3681                         ifa->rt = NULL;
3682                 } else {
3683                         state = ifa->state;
3684                         ifa->state = INET6_IFADDR_STATE_DEAD;
3685                 }
3686
3687                 spin_unlock_bh(&ifa->lock);
3688
3689                 if (rt)
3690                         ip6_del_rt(rt);
3691
3692                 if (state != INET6_IFADDR_STATE_DEAD) {
3693                         __ipv6_ifa_notify(RTM_DELADDR, ifa);
3694                         inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3695                 } else {
3696                         if (idev->cnf.forwarding)
3697                                 addrconf_leave_anycast(ifa);
3698                         addrconf_leave_solict(ifa->idev, &ifa->addr);
3699                 }
3700
3701                 write_lock_bh(&idev->lock);
3702         }
3703
3704         write_unlock_bh(&idev->lock);
3705
3706         /* now clean up addresses to be removed */
3707         while (!list_empty(&del_list)) {
3708                 ifa = list_first_entry(&del_list,
3709                                        struct inet6_ifaddr, if_list);
3710                 list_del(&ifa->if_list);
3711
3712                 in6_ifa_put(ifa);
3713         }
3714
3715         /* Step 5: Discard anycast and multicast list */
3716         if (how) {
3717                 ipv6_ac_destroy_dev(idev);
3718                 ipv6_mc_destroy_dev(idev);
3719         } else {
3720                 ipv6_mc_down(idev);
3721         }
3722
3723         idev->tstamp = jiffies;
3724
3725         /* Last: Shot the device (if unregistered) */
3726         if (how) {
3727                 addrconf_sysctl_unregister(idev);
3728                 neigh_parms_release(&nd_tbl, idev->nd_parms);
3729                 neigh_ifdown(&nd_tbl, dev);
3730                 in6_dev_put(idev);
3731         }
3732         return 0;
3733 }
3734
3735 static void addrconf_rs_timer(unsigned long data)
3736 {
3737         struct inet6_dev *idev = (struct inet6_dev *)data;
3738         struct net_device *dev = idev->dev;
3739         struct in6_addr lladdr;
3740
3741         write_lock(&idev->lock);
3742         if (idev->dead || !(idev->if_flags & IF_READY))
3743                 goto out;
3744
3745         if (!ipv6_accept_ra(idev))
3746                 goto out;
3747
3748         /* Announcement received after solicitation was sent */
3749         if (idev->if_flags & IF_RA_RCVD)
3750                 goto out;
3751
3752         if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3753                 write_unlock(&idev->lock);
3754                 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3755                         ndisc_send_rs(dev, &lladdr,
3756                                       &in6addr_linklocal_allrouters);
3757                 else
3758                         goto put;
3759
3760                 write_lock(&idev->lock);
3761                 idev->rs_interval = rfc3315_s14_backoff_update(
3762                         idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3763                 /* The wait after the last probe can be shorter */
3764                 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3765                                              idev->cnf.rtr_solicits) ?
3766                                       idev->cnf.rtr_solicit_delay :
3767                                       idev->rs_interval);
3768         } else {
3769                 /*
3770                  * Note: we do not support deprecated "all on-link"
3771                  * assumption any longer.
3772                  */
3773                 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3774         }
3775
3776 out:
3777         write_unlock(&idev->lock);
3778 put:
3779         in6_dev_put(idev);
3780 }
3781
3782 /*
3783  *      Duplicate Address Detection
3784  */
3785 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3786 {
3787         unsigned long rand_num;
3788         struct inet6_dev *idev = ifp->idev;
3789         u64 nonce;
3790
3791         if (ifp->flags & IFA_F_OPTIMISTIC)
3792                 rand_num = 0;
3793         else
3794                 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3795
3796         nonce = 0;
3797         if (idev->cnf.enhanced_dad ||
3798             dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3799                 do
3800                         get_random_bytes(&nonce, 6);
3801                 while (nonce == 0);
3802         }
3803         ifp->dad_nonce = nonce;
3804         ifp->dad_probes = idev->cnf.dad_transmits;
3805         addrconf_mod_dad_work(ifp, rand_num);
3806 }
3807
3808 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3809 {
3810         struct inet6_dev *idev = ifp->idev;
3811         struct net_device *dev = idev->dev;
3812         bool bump_id, notify = false;
3813
3814         addrconf_join_solict(dev, &ifp->addr);
3815
3816         prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3817
3818         read_lock_bh(&idev->lock);
3819         spin_lock(&ifp->lock);
3820         if (ifp->state == INET6_IFADDR_STATE_DEAD)
3821                 goto out;
3822
3823         if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3824             idev->cnf.accept_dad < 1 ||
3825             !(ifp->flags&IFA_F_TENTATIVE) ||
3826             ifp->flags & IFA_F_NODAD) {
3827                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3828                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3829                 spin_unlock(&ifp->lock);
3830                 read_unlock_bh(&idev->lock);
3831
3832                 addrconf_dad_completed(ifp, bump_id);
3833                 return;
3834         }
3835
3836         if (!(idev->if_flags & IF_READY)) {
3837                 spin_unlock(&ifp->lock);
3838                 read_unlock_bh(&idev->lock);
3839                 /*
3840                  * If the device is not ready:
3841                  * - keep it tentative if it is a permanent address.
3842                  * - otherwise, kill it.
3843                  */
3844                 in6_ifa_hold(ifp);
3845                 addrconf_dad_stop(ifp, 0);
3846                 return;
3847         }
3848
3849         /*
3850          * Optimistic nodes can start receiving
3851          * Frames right away
3852          */
3853         if (ifp->flags & IFA_F_OPTIMISTIC) {
3854                 ip6_ins_rt(ifp->rt);
3855                 if (ipv6_use_optimistic_addr(idev)) {
3856                         /* Because optimistic nodes can use this address,
3857                          * notify listeners. If DAD fails, RTM_DELADDR is sent.
3858                          */
3859                         notify = true;
3860                 }
3861         }
3862
3863         addrconf_dad_kick(ifp);
3864 out:
3865         spin_unlock(&ifp->lock);
3866         read_unlock_bh(&idev->lock);
3867         if (notify)
3868                 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3869 }
3870
3871 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3872 {
3873         bool begin_dad = false;
3874
3875         spin_lock_bh(&ifp->lock);
3876         if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3877                 ifp->state = INET6_IFADDR_STATE_PREDAD;
3878                 begin_dad = true;
3879         }
3880         spin_unlock_bh(&ifp->lock);
3881
3882         if (begin_dad)
3883                 addrconf_mod_dad_work(ifp, 0);
3884 }
3885
3886 static void addrconf_dad_work(struct work_struct *w)
3887 {
3888         struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3889                                                 struct inet6_ifaddr,
3890                                                 dad_work);
3891         struct inet6_dev *idev = ifp->idev;
3892         bool bump_id, disable_ipv6 = false;
3893         struct in6_addr mcaddr;
3894
3895         enum {
3896                 DAD_PROCESS,
3897                 DAD_BEGIN,
3898                 DAD_ABORT,
3899         } action = DAD_PROCESS;
3900
3901         rtnl_lock();
3902
3903         spin_lock_bh(&ifp->lock);
3904         if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3905                 action = DAD_BEGIN;
3906                 ifp->state = INET6_IFADDR_STATE_DAD;
3907         } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3908                 action = DAD_ABORT;
3909                 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3910
3911                 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3912                     !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3913                         struct in6_addr addr;
3914
3915                         addr.s6_addr32[0] = htonl(0xfe800000);
3916                         addr.s6_addr32[1] = 0;
3917
3918                         if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3919                             ipv6_addr_equal(&ifp->addr, &addr)) {
3920                                 /* DAD failed for link-local based on MAC */
3921                                 idev->cnf.disable_ipv6 = 1;
3922
3923                                 pr_info("%s: IPv6 being disabled!\n",
3924                                         ifp->idev->dev->name);
3925                                 disable_ipv6 = true;
3926                         }
3927                 }
3928         }
3929         spin_unlock_bh(&ifp->lock);
3930
3931         if (action == DAD_BEGIN) {
3932                 addrconf_dad_begin(ifp);
3933                 goto out;
3934         } else if (action == DAD_ABORT) {
3935                 in6_ifa_hold(ifp);
3936                 addrconf_dad_stop(ifp, 1);
3937                 if (disable_ipv6)
3938                         addrconf_ifdown(idev->dev, 0);
3939                 goto out;
3940         }
3941
3942         if (!ifp->dad_probes && addrconf_dad_end(ifp))
3943                 goto out;
3944
3945         write_lock_bh(&idev->lock);
3946         if (idev->dead || !(idev->if_flags & IF_READY)) {
3947                 write_unlock_bh(&idev->lock);
3948                 goto out;
3949         }
3950
3951         spin_lock(&ifp->lock);
3952         if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3953                 spin_unlock(&ifp->lock);
3954                 write_unlock_bh(&idev->lock);
3955                 goto out;
3956         }
3957
3958         if (ifp->dad_probes == 0) {
3959                 /*
3960                  * DAD was successful
3961                  */
3962
3963                 bump_id = ifp->flags & IFA_F_TENTATIVE;
3964                 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3965                 spin_unlock(&ifp->lock);
3966                 write_unlock_bh(&idev->lock);
3967
3968                 addrconf_dad_completed(ifp, bump_id);
3969
3970                 goto out;
3971         }
3972
3973         ifp->dad_probes--;
3974         addrconf_mod_dad_work(ifp,
3975                               NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3976         spin_unlock(&ifp->lock);
3977         write_unlock_bh(&idev->lock);
3978
3979         /* send a neighbour solicitation for our addr */
3980         addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3981         ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3982                       ifp->dad_nonce);
3983 out:
3984         in6_ifa_put(ifp);
3985         rtnl_unlock();
3986 }
3987
3988 /* ifp->idev must be at least read locked */
3989 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3990 {
3991         struct inet6_ifaddr *ifpiter;
3992         struct inet6_dev *idev = ifp->idev;
3993
3994         list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3995                 if (ifpiter->scope > IFA_LINK)
3996                         break;
3997                 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3998                     (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3999                                        IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4000                     IFA_F_PERMANENT)
4001                         return false;
4002         }
4003         return true;
4004 }
4005
4006 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
4007 {
4008         struct net_device *dev = ifp->idev->dev;
4009         struct in6_addr lladdr;
4010         bool send_rs, send_mld;
4011
4012         addrconf_del_dad_work(ifp);
4013
4014         /*
4015          *      Configure the address for reception. Now it is valid.
4016          */
4017
4018         ipv6_ifa_notify(RTM_NEWADDR, ifp);
4019
4020         /* If added prefix is link local and we are prepared to process
4021            router advertisements, start sending router solicitations.
4022          */
4023
4024         read_lock_bh(&ifp->idev->lock);
4025         send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4026         send_rs = send_mld &&
4027                   ipv6_accept_ra(ifp->idev) &&
4028                   ifp->idev->cnf.rtr_solicits != 0 &&
4029                   (dev->flags&IFF_LOOPBACK) == 0;
4030         read_unlock_bh(&ifp->idev->lock);
4031
4032         /* While dad is in progress mld report's source address is in6_addrany.
4033          * Resend with proper ll now.
4034          */
4035         if (send_mld)
4036                 ipv6_mc_dad_complete(ifp->idev);
4037
4038         if (send_rs) {
4039                 /*
4040                  *      If a host as already performed a random delay
4041                  *      [...] as part of DAD [...] there is no need
4042                  *      to delay again before sending the first RS
4043                  */
4044                 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4045                         return;
4046                 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4047
4048                 write_lock_bh(&ifp->idev->lock);
4049                 spin_lock(&ifp->lock);
4050                 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4051                         ifp->idev->cnf.rtr_solicit_interval);
4052                 ifp->idev->rs_probes = 1;
4053                 ifp->idev->if_flags |= IF_RS_SENT;
4054                 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4055                 spin_unlock(&ifp->lock);
4056                 write_unlock_bh(&ifp->idev->lock);
4057         }
4058
4059         if (bump_id)
4060                 rt_genid_bump_ipv6(dev_net(dev));
4061
4062         /* Make sure that a new temporary address will be created
4063          * before this temporary address becomes deprecated.
4064          */
4065         if (ifp->flags & IFA_F_TEMPORARY)
4066                 addrconf_verify_rtnl();
4067 }
4068
4069 static void addrconf_dad_run(struct inet6_dev *idev)
4070 {
4071         struct inet6_ifaddr *ifp;
4072
4073         read_lock_bh(&idev->lock);
4074         list_for_each_entry(ifp, &idev->addr_list, if_list) {
4075                 spin_lock(&ifp->lock);
4076                 if (ifp->flags & IFA_F_TENTATIVE &&
4077                     ifp->state == INET6_IFADDR_STATE_DAD)
4078                         addrconf_dad_kick(ifp);
4079                 spin_unlock(&ifp->lock);
4080         }
4081         read_unlock_bh(&idev->lock);
4082 }
4083
4084 #ifdef CONFIG_PROC_FS
4085 struct if6_iter_state {
4086         struct seq_net_private p;
4087         int bucket;
4088         int offset;
4089 };
4090
4091 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4092 {
4093         struct inet6_ifaddr *ifa = NULL;
4094         struct if6_iter_state *state = seq->private;
4095         struct net *net = seq_file_net(seq);
4096         int p = 0;
4097
4098         /* initial bucket if pos is 0 */
4099         if (pos == 0) {
4100                 state->bucket = 0;
4101                 state->offset = 0;
4102         }
4103
4104         for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4105                 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4106                                          addr_lst) {
4107                         if (!net_eq(dev_net(ifa->idev->dev), net))
4108                                 continue;
4109                         /* sync with offset */
4110                         if (p < state->offset) {
4111                                 p++;
4112                                 continue;
4113                         }
4114                         state->offset++;
4115                         return ifa;
4116                 }
4117
4118                 /* prepare for next bucket */
4119                 state->offset = 0;
4120                 p = 0;
4121         }
4122         return NULL;
4123 }
4124
4125 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4126                                          struct inet6_ifaddr *ifa)
4127 {
4128         struct if6_iter_state *state = seq->private;
4129         struct net *net = seq_file_net(seq);
4130
4131         hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4132                 if (!net_eq(dev_net(ifa->idev->dev), net))
4133                         continue;
4134                 state->offset++;
4135                 return ifa;
4136         }
4137
4138         while (++state->bucket < IN6_ADDR_HSIZE) {
4139                 state->offset = 0;
4140                 hlist_for_each_entry_rcu_bh(ifa,
4141                                      &inet6_addr_lst[state->bucket], addr_lst) {
4142                         if (!net_eq(dev_net(ifa->idev->dev), net))
4143                                 continue;
4144                         state->offset++;
4145                         return ifa;
4146                 }
4147         }
4148
4149         return NULL;
4150 }
4151
4152 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4153         __acquires(rcu_bh)
4154 {
4155         rcu_read_lock_bh();
4156         return if6_get_first(seq, *pos);
4157 }
4158
4159 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4160 {
4161         struct inet6_ifaddr *ifa;
4162
4163         ifa = if6_get_next(seq, v);
4164         ++*pos;
4165         return ifa;
4166 }
4167
4168 static void if6_seq_stop(struct seq_file *seq, void *v)
4169         __releases(rcu_bh)
4170 {
4171         rcu_read_unlock_bh();
4172 }
4173
4174 static int if6_seq_show(struct seq_file *seq, void *v)
4175 {
4176         struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4177         seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4178                    &ifp->addr,
4179                    ifp->idev->dev->ifindex,
4180                    ifp->prefix_len,
4181                    ifp->scope,
4182                    (u8) ifp->flags,
4183                    ifp->idev->dev->name);
4184         return 0;
4185 }
4186
4187 static const struct seq_operations if6_seq_ops = {
4188         .start  = if6_seq_start,
4189         .next   = if6_seq_next,
4190         .show   = if6_seq_show,
4191         .stop   = if6_seq_stop,
4192 };
4193
4194 static int if6_seq_open(struct inode *inode, struct file *file)
4195 {
4196         return seq_open_net(inode, file, &if6_seq_ops,
4197                             sizeof(struct if6_iter_state));
4198 }
4199
4200 static const struct file_operations if6_fops = {
4201         .owner          = THIS_MODULE,
4202         .open           = if6_seq_open,
4203         .read           = seq_read,
4204         .llseek         = seq_lseek,
4205         .release        = seq_release_net,
4206 };
4207
4208 static int __net_init if6_proc_net_init(struct net *net)
4209 {
4210         if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4211                 return -ENOMEM;
4212         return 0;
4213 }
4214
4215 static void __net_exit if6_proc_net_exit(struct net *net)
4216 {
4217         remove_proc_entry("if_inet6", net->proc_net);
4218 }
4219
4220 static struct pernet_operations if6_proc_net_ops = {
4221         .init = if6_proc_net_init,
4222         .exit = if6_proc_net_exit,
4223 };
4224
4225 int __init if6_proc_init(void)
4226 {
4227         return register_pernet_subsys(&if6_proc_net_ops);
4228 }
4229
4230 void if6_proc_exit(void)
4231 {
4232         unregister_pernet_subsys(&if6_proc_net_ops);
4233 }
4234 #endif  /* CONFIG_PROC_FS */
4235
4236 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4237 /* Check if address is a home address configured on any interface. */
4238 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4239 {
4240         int ret = 0;
4241         struct inet6_ifaddr *ifp = NULL;
4242         unsigned int hash = inet6_addr_hash(addr);
4243
4244         rcu_read_lock_bh();
4245         hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4246                 if (!net_eq(dev_net(ifp->idev->dev), net))
4247                         continue;
4248                 if (ipv6_addr_equal(&ifp->addr, addr) &&
4249                     (ifp->flags & IFA_F_HOMEADDRESS)) {
4250                         ret = 1;
4251                         break;
4252                 }
4253         }
4254         rcu_read_unlock_bh();
4255         return ret;
4256 }
4257 #endif
4258
4259 /*
4260  *      Periodic address status verification
4261  */
4262
4263 static void addrconf_verify_rtnl(void)
4264 {
4265         unsigned long now, next, next_sec, next_sched;
4266         struct inet6_ifaddr *ifp;
4267         int i;
4268
4269         ASSERT_RTNL();
4270
4271         rcu_read_lock_bh();
4272         now = jiffies;
4273         next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4274
4275         cancel_delayed_work(&addr_chk_work);
4276
4277         for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4278 restart:
4279                 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4280                         unsigned long age;
4281
4282                         /* When setting preferred_lft to a value not zero or
4283                          * infinity, while valid_lft is infinity
4284                          * IFA_F_PERMANENT has a non-infinity life time.
4285                          */
4286                         if ((ifp->flags & IFA_F_PERMANENT) &&
4287                             (ifp->prefered_lft == INFINITY_LIFE_TIME))
4288                                 continue;
4289
4290                         spin_lock(&ifp->lock);
4291                         /* We try to batch several events at once. */
4292                         age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4293
4294                         if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4295                             age >= ifp->valid_lft) {
4296                                 spin_unlock(&ifp->lock);
4297                                 in6_ifa_hold(ifp);
4298                                 ipv6_del_addr(ifp);
4299                                 goto restart;
4300                         } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4301                                 spin_unlock(&ifp->lock);
4302                                 continue;
4303                         } else if (age >= ifp->prefered_lft) {
4304                                 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4305                                 int deprecate = 0;
4306
4307                                 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4308                                         deprecate = 1;
4309                                         ifp->flags |= IFA_F_DEPRECATED;
4310                                 }
4311
4312                                 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4313                                     (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4314                                         next = ifp->tstamp + ifp->valid_lft * HZ;
4315
4316                                 spin_unlock(&ifp->lock);
4317
4318                                 if (deprecate) {
4319                                         in6_ifa_hold(ifp);
4320
4321                                         ipv6_ifa_notify(0, ifp);
4322                                         in6_ifa_put(ifp);
4323                                         goto restart;
4324                                 }
4325                         } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4326                                    !(ifp->flags&IFA_F_TENTATIVE)) {
4327                                 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4328                                         ifp->idev->cnf.dad_transmits *
4329                                         NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4330
4331                                 if (age >= ifp->prefered_lft - regen_advance) {
4332                                         struct inet6_ifaddr *ifpub = ifp->ifpub;
4333                                         if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4334                                                 next = ifp->tstamp + ifp->prefered_lft * HZ;
4335                                         if (!ifp->regen_count && ifpub) {
4336                                                 ifp->regen_count++;
4337                                                 in6_ifa_hold(ifp);
4338                                                 in6_ifa_hold(ifpub);
4339                                                 spin_unlock(&ifp->lock);
4340
4341                                                 spin_lock(&ifpub->lock);
4342                                                 ifpub->regen_count = 0;
4343                                                 spin_unlock(&ifpub->lock);
4344                                                 ipv6_create_tempaddr(ifpub, ifp);
4345                                                 in6_ifa_put(ifpub);
4346                                                 in6_ifa_put(ifp);
4347                                                 goto restart;
4348                                         }
4349                                 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4350                                         next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4351                                 spin_unlock(&ifp->lock);
4352                         } else {
4353                                 /* ifp->prefered_lft <= ifp->valid_lft */
4354                                 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4355                                         next = ifp->tstamp + ifp->prefered_lft * HZ;
4356                                 spin_unlock(&ifp->lock);
4357                         }
4358                 }
4359         }
4360
4361         next_sec = round_jiffies_up(next);
4362         next_sched = next;
4363
4364         /* If rounded timeout is accurate enough, accept it. */
4365         if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4366                 next_sched = next_sec;
4367
4368         /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4369         if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4370                 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4371
4372         ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4373               now, next, next_sec, next_sched);
4374         mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4375         rcu_read_unlock_bh();
4376 }
4377
4378 static void addrconf_verify_work(struct work_struct *w)
4379 {
4380         rtnl_lock();
4381         addrconf_verify_rtnl();
4382         rtnl_unlock();
4383 }
4384
4385 static void addrconf_verify(void)
4386 {
4387         mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4388 }
4389
4390 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4391                                      struct in6_addr **peer_pfx)
4392 {
4393         struct in6_addr *pfx = NULL;
4394
4395         *peer_pfx = NULL;
4396
4397         if (addr)
4398                 pfx = nla_data(addr);
4399
4400         if (local) {
4401                 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4402                         *peer_pfx = pfx;
4403                 pfx = nla_data(local);
4404         }
4405
4406         return pfx;
4407 }
4408
4409 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4410         [IFA_ADDRESS]           = { .len = sizeof(struct in6_addr) },
4411         [IFA_LOCAL]             = { .len = sizeof(struct in6_addr) },
4412         [IFA_CACHEINFO]         = { .len = sizeof(struct ifa_cacheinfo) },
4413         [IFA_FLAGS]             = { .len = sizeof(u32) },
4414 };
4415
4416 static int
4417 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4418                   struct netlink_ext_ack *extack)
4419 {
4420         struct net *net = sock_net(skb->sk);
4421         struct ifaddrmsg *ifm;
4422         struct nlattr *tb[IFA_MAX+1];
4423         struct in6_addr *pfx, *peer_pfx;
4424         u32 ifa_flags;
4425         int err;
4426
4427         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4428                           extack);
4429         if (err < 0)
4430                 return err;
4431
4432         ifm = nlmsg_data(nlh);
4433         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4434         if (!pfx)
4435                 return -EINVAL;
4436
4437         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4438
4439         /* We ignore other flags so far. */
4440         ifa_flags &= IFA_F_MANAGETEMPADDR;
4441
4442         return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4443                               ifm->ifa_prefixlen);
4444 }
4445
4446 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4447                              u32 prefered_lft, u32 valid_lft)
4448 {
4449         u32 flags;
4450         clock_t expires;
4451         unsigned long timeout;
4452         bool was_managetempaddr;
4453         bool had_prefixroute;
4454
4455         ASSERT_RTNL();
4456
4457         if (!valid_lft || (prefered_lft > valid_lft))
4458                 return -EINVAL;
4459
4460         if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4461             (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4462                 return -EINVAL;
4463
4464         timeout = addrconf_timeout_fixup(valid_lft, HZ);
4465         if (addrconf_finite_timeout(timeout)) {
4466                 expires = jiffies_to_clock_t(timeout * HZ);
4467                 valid_lft = timeout;
4468                 flags = RTF_EXPIRES;
4469         } else {
4470                 expires = 0;
4471                 flags = 0;
4472                 ifa_flags |= IFA_F_PERMANENT;
4473         }
4474
4475         timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4476         if (addrconf_finite_timeout(timeout)) {
4477                 if (timeout == 0)
4478                         ifa_flags |= IFA_F_DEPRECATED;
4479                 prefered_lft = timeout;
4480         }
4481
4482         spin_lock_bh(&ifp->lock);
4483         was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4484         had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4485                           !(ifp->flags & IFA_F_NOPREFIXROUTE);
4486         ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4487                         IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4488                         IFA_F_NOPREFIXROUTE);
4489         ifp->flags |= ifa_flags;
4490         ifp->tstamp = jiffies;
4491         ifp->valid_lft = valid_lft;
4492         ifp->prefered_lft = prefered_lft;
4493
4494         spin_unlock_bh(&ifp->lock);
4495         if (!(ifp->flags&IFA_F_TENTATIVE))
4496                 ipv6_ifa_notify(0, ifp);
4497
4498         if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4499                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4500                                       expires, flags);
4501         } else if (had_prefixroute) {
4502                 enum cleanup_prefix_rt_t action;
4503                 unsigned long rt_expires;
4504
4505                 write_lock_bh(&ifp->idev->lock);
4506                 action = check_cleanup_prefix_route(ifp, &rt_expires);
4507                 write_unlock_bh(&ifp->idev->lock);
4508
4509                 if (action != CLEANUP_PREFIX_RT_NOP) {
4510                         cleanup_prefix_route(ifp, rt_expires,
4511                                 action == CLEANUP_PREFIX_RT_DEL);
4512                 }
4513         }
4514
4515         if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4516                 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4517                         valid_lft = prefered_lft = 0;
4518                 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4519                                  !was_managetempaddr, jiffies);
4520         }
4521
4522         addrconf_verify_rtnl();
4523
4524         return 0;
4525 }
4526
4527 static int
4528 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4529                   struct netlink_ext_ack *extack)
4530 {
4531         struct net *net = sock_net(skb->sk);
4532         struct ifaddrmsg *ifm;
4533         struct nlattr *tb[IFA_MAX+1];
4534         struct in6_addr *pfx, *peer_pfx;
4535         struct inet6_ifaddr *ifa;
4536         struct net_device *dev;
4537         u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4538         u32 ifa_flags;
4539         int err;
4540
4541         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4542                           extack);
4543         if (err < 0)
4544                 return err;
4545
4546         ifm = nlmsg_data(nlh);
4547         pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4548         if (!pfx)
4549                 return -EINVAL;
4550
4551         if (tb[IFA_CACHEINFO]) {
4552                 struct ifa_cacheinfo *ci;
4553
4554                 ci = nla_data(tb[IFA_CACHEINFO]);
4555                 valid_lft = ci->ifa_valid;
4556                 preferred_lft = ci->ifa_prefered;
4557         } else {
4558                 preferred_lft = INFINITY_LIFE_TIME;
4559                 valid_lft = INFINITY_LIFE_TIME;
4560         }
4561
4562         dev =  __dev_get_by_index(net, ifm->ifa_index);
4563         if (!dev)
4564                 return -ENODEV;
4565
4566         ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4567
4568         /* We ignore other flags so far. */
4569         ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4570                      IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4571
4572         ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4573         if (!ifa) {
4574                 /*
4575                  * It would be best to check for !NLM_F_CREATE here but
4576                  * userspace already relies on not having to provide this.
4577                  */
4578                 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4579                                       ifm->ifa_prefixlen, ifa_flags,
4580                                       preferred_lft, valid_lft);
4581         }
4582
4583         if (nlh->nlmsg_flags & NLM_F_EXCL ||
4584             !(nlh->nlmsg_flags & NLM_F_REPLACE))
4585                 err = -EEXIST;
4586         else
4587                 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4588
4589         in6_ifa_put(ifa);
4590
4591         return err;
4592 }
4593
4594 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4595                           u8 scope, int ifindex)
4596 {
4597         struct ifaddrmsg *ifm;
4598
4599         ifm = nlmsg_data(nlh);
4600         ifm->ifa_family = AF_INET6;
4601         ifm->ifa_prefixlen = prefixlen;
4602         ifm->ifa_flags = flags;
4603         ifm->ifa_scope = scope;
4604         ifm->ifa_index = ifindex;
4605 }
4606
4607 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4608                          unsigned long tstamp, u32 preferred, u32 valid)
4609 {
4610         struct ifa_cacheinfo ci;
4611
4612         ci.cstamp = cstamp_delta(cstamp);
4613         ci.tstamp = cstamp_delta(tstamp);
4614         ci.ifa_prefered = preferred;
4615         ci.ifa_valid = valid;
4616
4617         return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4618 }
4619
4620 static inline int rt_scope(int ifa_scope)
4621 {
4622         if (ifa_scope & IFA_HOST)
4623                 return RT_SCOPE_HOST;
4624         else if (ifa_scope & IFA_LINK)
4625                 return RT_SCOPE_LINK;
4626         else if (ifa_scope & IFA_SITE)
4627                 return RT_SCOPE_SITE;
4628         else
4629                 return RT_SCOPE_UNIVERSE;
4630 }
4631
4632 static inline int inet6_ifaddr_msgsize(void)
4633 {
4634         return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4635                + nla_total_size(16) /* IFA_LOCAL */
4636                + nla_total_size(16) /* IFA_ADDRESS */
4637                + nla_total_size(sizeof(struct ifa_cacheinfo))
4638                + nla_total_size(4)  /* IFA_FLAGS */;
4639 }
4640
4641 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4642                              u32 portid, u32 seq, int event, unsigned int flags)
4643 {
4644         struct nlmsghdr  *nlh;
4645         u32 preferred, valid;
4646
4647         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4648         if (!nlh)
4649                 return -EMSGSIZE;
4650
4651         put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4652                       ifa->idev->dev->ifindex);
4653
4654         if (!((ifa->flags&IFA_F_PERMANENT) &&
4655               (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4656                 preferred = ifa->prefered_lft;
4657                 valid = ifa->valid_lft;
4658                 if (preferred != INFINITY_LIFE_TIME) {
4659                         long tval = (jiffies - ifa->tstamp)/HZ;
4660                         if (preferred > tval)
4661                                 preferred -= tval;
4662                         else
4663                                 preferred = 0;
4664                         if (valid != INFINITY_LIFE_TIME) {
4665                                 if (valid > tval)
4666                                         valid -= tval;
4667                                 else
4668                                         valid = 0;
4669                         }
4670                 }
4671         } else {
4672                 preferred = INFINITY_LIFE_TIME;
4673                 valid = INFINITY_LIFE_TIME;
4674         }
4675
4676         if (!ipv6_addr_any(&ifa->peer_addr)) {
4677                 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4678                     nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4679                         goto error;
4680         } else
4681                 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4682                         goto error;
4683
4684         if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4685                 goto error;
4686
4687         if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4688                 goto error;
4689
4690         nlmsg_end(skb, nlh);
4691         return 0;
4692
4693 error:
4694         nlmsg_cancel(skb, nlh);
4695         return -EMSGSIZE;
4696 }
4697
4698 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4699                                 u32 portid, u32 seq, int event, u16 flags)
4700 {
4701         struct nlmsghdr  *nlh;
4702         u8 scope = RT_SCOPE_UNIVERSE;
4703         int ifindex = ifmca->idev->dev->ifindex;
4704
4705         if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4706                 scope = RT_SCOPE_SITE;
4707
4708         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4709         if (!nlh)
4710                 return -EMSGSIZE;
4711
4712         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4713         if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4714             put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4715                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4716                 nlmsg_cancel(skb, nlh);
4717                 return -EMSGSIZE;
4718         }
4719
4720         nlmsg_end(skb, nlh);
4721         return 0;
4722 }
4723
4724 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4725                                 u32 portid, u32 seq, int event, unsigned int flags)
4726 {
4727         struct nlmsghdr  *nlh;
4728         u8 scope = RT_SCOPE_UNIVERSE;
4729         int ifindex = ifaca->aca_idev->dev->ifindex;
4730
4731         if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4732                 scope = RT_SCOPE_SITE;
4733
4734         nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4735         if (!nlh)
4736                 return -EMSGSIZE;
4737
4738         put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4739         if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4740             put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4741                           INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4742                 nlmsg_cancel(skb, nlh);
4743                 return -EMSGSIZE;
4744         }
4745
4746         nlmsg_end(skb, nlh);
4747         return 0;
4748 }
4749
4750 enum addr_type_t {
4751         UNICAST_ADDR,
4752         MULTICAST_ADDR,
4753         ANYCAST_ADDR,
4754 };
4755
4756 /* called with rcu_read_lock() */
4757 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4758                           struct netlink_callback *cb, enum addr_type_t type,
4759                           int s_ip_idx, int *p_ip_idx)
4760 {
4761         struct ifmcaddr6 *ifmca;
4762         struct ifacaddr6 *ifaca;
4763         int err = 1;
4764         int ip_idx = *p_ip_idx;
4765
4766         read_lock_bh(&idev->lock);
4767         switch (type) {
4768         case UNICAST_ADDR: {
4769                 struct inet6_ifaddr *ifa;
4770
4771                 /* unicast address incl. temp addr */
4772                 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4773                         if (++ip_idx < s_ip_idx)
4774                                 continue;
4775                         err = inet6_fill_ifaddr(skb, ifa,
4776                                                 NETLINK_CB(cb->skb).portid,
4777                                                 cb->nlh->nlmsg_seq,
4778                                                 RTM_NEWADDR,
4779                                                 NLM_F_MULTI);
4780                         if (err < 0)
4781                                 break;
4782                         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4783                 }
4784                 break;
4785         }
4786         case MULTICAST_ADDR:
4787                 /* multicast address */
4788                 for (ifmca = idev->mc_list; ifmca;
4789                      ifmca = ifmca->next, ip_idx++) {
4790                         if (ip_idx < s_ip_idx)
4791                                 continue;
4792                         err = inet6_fill_ifmcaddr(skb, ifmca,
4793                                                   NETLINK_CB(cb->skb).portid,
4794                                                   cb->nlh->nlmsg_seq,
4795                                                   RTM_GETMULTICAST,
4796                                                   NLM_F_MULTI);
4797                         if (err < 0)
4798                                 break;
4799                 }
4800                 break;
4801         case ANYCAST_ADDR:
4802                 /* anycast address */
4803                 for (ifaca = idev->ac_list; ifaca;
4804                      ifaca = ifaca->aca_next, ip_idx++) {
4805                         if (ip_idx < s_ip_idx)
4806                                 continue;
4807                         err = inet6_fill_ifacaddr(skb, ifaca,
4808                                                   NETLINK_CB(cb->skb).portid,
4809                                                   cb->nlh->nlmsg_seq,
4810                                                   RTM_GETANYCAST,
4811                                                   NLM_F_MULTI);
4812                         if (err < 0)
4813                                 break;
4814                 }
4815                 break;
4816         default:
4817                 break;
4818         }
4819         read_unlock_bh(&idev->lock);
4820         *p_ip_idx = ip_idx;
4821         return err;
4822 }
4823
4824 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4825                            enum addr_type_t type)
4826 {
4827         struct net *net = sock_net(skb->sk);
4828         int h, s_h;
4829         int idx, ip_idx;
4830         int s_idx, s_ip_idx;
4831         struct net_device *dev;
4832         struct inet6_dev *idev;
4833         struct hlist_head *head;
4834
4835         s_h = cb->args[0];
4836         s_idx = idx = cb->args[1];
4837         s_ip_idx = ip_idx = cb->args[2];
4838
4839         rcu_read_lock();
4840         cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4841         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4842                 idx = 0;
4843                 head = &net->dev_index_head[h];
4844                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4845                         if (idx < s_idx)
4846                                 goto cont;
4847                         if (h > s_h || idx > s_idx)
4848                                 s_ip_idx = 0;
4849                         ip_idx = 0;
4850                         idev = __in6_dev_get(dev);
4851                         if (!idev)
4852                                 goto cont;
4853
4854                         if (in6_dump_addrs(idev, skb, cb, type,
4855                                            s_ip_idx, &ip_idx) < 0)
4856                                 goto done;
4857 cont:
4858                         idx++;
4859                 }
4860         }
4861 done:
4862         rcu_read_unlock();
4863         cb->args[0] = h;
4864         cb->args[1] = idx;
4865         cb->args[2] = ip_idx;
4866
4867         return skb->len;
4868 }
4869
4870 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4871 {
4872         enum addr_type_t type = UNICAST_ADDR;
4873
4874         return inet6_dump_addr(skb, cb, type);
4875 }
4876
4877 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4878 {
4879         enum addr_type_t type = MULTICAST_ADDR;
4880
4881         return inet6_dump_addr(skb, cb, type);
4882 }
4883
4884
4885 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4886 {
4887         enum addr_type_t type = ANYCAST_ADDR;
4888
4889         return inet6_dump_addr(skb, cb, type);
4890 }
4891
4892 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4893                              struct netlink_ext_ack *extack)
4894 {
4895         struct net *net = sock_net(in_skb->sk);
4896         struct ifaddrmsg *ifm;
4897         struct nlattr *tb[IFA_MAX+1];
4898         struct in6_addr *addr = NULL, *peer;
4899         struct net_device *dev = NULL;
4900         struct inet6_ifaddr *ifa;
4901         struct sk_buff *skb;
4902         int err;
4903
4904         err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4905                           extack);
4906         if (err < 0)
4907                 goto errout;
4908
4909         addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4910         if (!addr) {
4911                 err = -EINVAL;
4912                 goto errout;
4913         }
4914
4915         ifm = nlmsg_data(nlh);
4916         if (ifm->ifa_index)
4917                 dev = __dev_get_by_index(net, ifm->ifa_index);
4918
4919         ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4920         if (!ifa) {
4921                 err = -EADDRNOTAVAIL;
4922                 goto errout;
4923         }
4924
4925         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4926         if (!skb) {
4927                 err = -ENOBUFS;
4928                 goto errout_ifa;
4929         }
4930
4931         err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4932                                 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4933         if (err < 0) {
4934                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4935                 WARN_ON(err == -EMSGSIZE);
4936                 kfree_skb(skb);
4937                 goto errout_ifa;
4938         }
4939         err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4940 errout_ifa:
4941         in6_ifa_put(ifa);
4942 errout:
4943         return err;
4944 }
4945
4946 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4947 {
4948         struct sk_buff *skb;
4949         struct net *net = dev_net(ifa->idev->dev);
4950         int err = -ENOBUFS;
4951
4952         /* Don't send DELADDR notification for TENTATIVE address,
4953          * since NEWADDR notification is sent only after removing
4954          * TENTATIVE flag.
4955          */
4956         if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4957                 return;
4958
4959         skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4960         if (!skb)
4961                 goto errout;
4962
4963         err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4964         if (err < 0) {
4965                 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4966                 WARN_ON(err == -EMSGSIZE);
4967                 kfree_skb(skb);
4968                 goto errout;
4969         }
4970         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4971         return;
4972 errout:
4973         if (err < 0)
4974                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4975 }
4976
4977 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4978                                 __s32 *array, int bytes)
4979 {
4980         BUG_ON(bytes < (DEVCONF_MAX * 4));
4981
4982         memset(array, 0, bytes);
4983         array[DEVCONF_FORWARDING] = cnf->forwarding;
4984         array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4985         array[DEVCONF_MTU6] = cnf->mtu6;
4986         array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4987         array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4988         array[DEVCONF_AUTOCONF] = cnf->autoconf;
4989         array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4990         array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4991         array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4992                 jiffies_to_msecs(cnf->rtr_solicit_interval);
4993         array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4994                 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
4995         array[DEVCONF_RTR_SOLICIT_DELAY] =
4996                 jiffies_to_msecs(cnf->rtr_solicit_delay);
4997         array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4998         array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4999                 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5000         array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5001                 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5002         array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5003         array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5004         array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5005         array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5006         array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5007         array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5008         array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5009         array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5010         array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5011 #ifdef CONFIG_IPV6_ROUTER_PREF
5012         array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5013         array[DEVCONF_RTR_PROBE_INTERVAL] =
5014                 jiffies_to_msecs(cnf->rtr_probe_interval);
5015 #ifdef CONFIG_IPV6_ROUTE_INFO
5016         array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5017         array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5018 #endif
5019 #endif
5020         array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5021         array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5022 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5023         array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5024         array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5025 #endif
5026 #ifdef CONFIG_IPV6_MROUTE
5027         array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5028 #endif
5029         array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5030         array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5031         array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5032         array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5033         array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5034         array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5035         array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5036         array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5037         /* we omit DEVCONF_STABLE_SECRET for now */
5038         array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5039         array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5040         array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5041         array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5042         array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5043 #ifdef CONFIG_IPV6_SEG6_HMAC
5044         array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5045 #endif
5046         array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5047         array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5048         array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5049 }
5050
5051 static inline size_t inet6_ifla6_size(void)
5052 {
5053         return nla_total_size(4) /* IFLA_INET6_FLAGS */
5054              + nla_total_size(sizeof(struct ifla_cacheinfo))
5055              + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5056              + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5057              + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5058              + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5059 }
5060
5061 static inline size_t inet6_if_nlmsg_size(void)
5062 {
5063         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5064                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5065                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5066                + nla_total_size(4) /* IFLA_MTU */
5067                + nla_total_size(4) /* IFLA_LINK */
5068                + nla_total_size(1) /* IFLA_OPERSTATE */
5069                + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5070 }
5071
5072 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5073                                         int bytes)
5074 {
5075         int i;
5076         int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5077         BUG_ON(pad < 0);
5078
5079         /* Use put_unaligned() because stats may not be aligned for u64. */
5080         put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5081         for (i = 1; i < ICMP6_MIB_MAX; i++)
5082                 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5083
5084         memset(&stats[ICMP6_MIB_MAX], 0, pad);
5085 }
5086
5087 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5088                                         int bytes, size_t syncpoff)
5089 {
5090         int i, c;
5091         u64 buff[IPSTATS_MIB_MAX];
5092         int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5093
5094         BUG_ON(pad < 0);
5095
5096         memset(buff, 0, sizeof(buff));
5097         buff[0] = IPSTATS_MIB_MAX;
5098
5099         for_each_possible_cpu(c) {
5100                 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5101                         buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5102         }
5103
5104         memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5105         memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5106 }
5107
5108 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5109                              int bytes)
5110 {
5111         switch (attrtype) {
5112         case IFLA_INET6_STATS:
5113                 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5114                                      offsetof(struct ipstats_mib, syncp));
5115                 break;
5116         case IFLA_INET6_ICMP6STATS:
5117                 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5118                 break;
5119         }
5120 }
5121
5122 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5123                                   u32 ext_filter_mask)
5124 {
5125         struct nlattr *nla;
5126         struct ifla_cacheinfo ci;
5127
5128         if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5129                 goto nla_put_failure;
5130         ci.max_reasm_len = IPV6_MAXPLEN;
5131         ci.tstamp = cstamp_delta(idev->tstamp);
5132         ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5133         ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5134         if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5135                 goto nla_put_failure;
5136         nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5137         if (!nla)
5138                 goto nla_put_failure;
5139         ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5140
5141         /* XXX - MC not implemented */
5142
5143         if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5144                 return 0;
5145
5146         nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5147         if (!nla)
5148                 goto nla_put_failure;
5149         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5150
5151         nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5152         if (!nla)
5153                 goto nla_put_failure;
5154         snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5155
5156         nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5157         if (!nla)
5158                 goto nla_put_failure;
5159
5160         if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5161                 goto nla_put_failure;
5162
5163         read_lock_bh(&idev->lock);
5164         memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5165         read_unlock_bh(&idev->lock);
5166
5167         return 0;
5168
5169 nla_put_failure:
5170         return -EMSGSIZE;
5171 }
5172
5173 static size_t inet6_get_link_af_size(const struct net_device *dev,
5174                                      u32 ext_filter_mask)
5175 {
5176         if (!__in6_dev_get(dev))
5177                 return 0;
5178
5179         return inet6_ifla6_size();
5180 }
5181
5182 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5183                               u32 ext_filter_mask)
5184 {
5185         struct inet6_dev *idev = __in6_dev_get(dev);
5186
5187         if (!idev)
5188                 return -ENODATA;
5189
5190         if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5191                 return -EMSGSIZE;
5192
5193         return 0;
5194 }
5195
5196 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5197 {
5198         struct inet6_ifaddr *ifp;
5199         struct net_device *dev = idev->dev;
5200         bool clear_token, update_rs = false;
5201         struct in6_addr ll_addr;
5202
5203         ASSERT_RTNL();
5204
5205         if (!token)
5206                 return -EINVAL;
5207         if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5208                 return -EINVAL;
5209         if (!ipv6_accept_ra(idev))
5210                 return -EINVAL;
5211         if (idev->cnf.rtr_solicits == 0)
5212                 return -EINVAL;
5213
5214         write_lock_bh(&idev->lock);
5215
5216         BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5217         memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5218
5219         write_unlock_bh(&idev->lock);
5220
5221         clear_token = ipv6_addr_any(token);
5222         if (clear_token)
5223                 goto update_lft;
5224
5225         if (!idev->dead && (idev->if_flags & IF_READY) &&
5226             !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5227                              IFA_F_OPTIMISTIC)) {
5228                 /* If we're not ready, then normal ifup will take care
5229                  * of this. Otherwise, we need to request our rs here.
5230                  */
5231                 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5232                 update_rs = true;
5233         }
5234
5235 update_lft:
5236         write_lock_bh(&idev->lock);
5237
5238         if (update_rs) {
5239                 idev->if_flags |= IF_RS_SENT;
5240                 idev->rs_interval = rfc3315_s14_backoff_init(
5241                         idev->cnf.rtr_solicit_interval);
5242                 idev->rs_probes = 1;
5243                 addrconf_mod_rs_timer(idev, idev->rs_interval);
5244         }
5245
5246         /* Well, that's kinda nasty ... */
5247         list_for_each_entry(ifp, &idev->addr_list, if_list) {
5248                 spin_lock(&ifp->lock);
5249                 if (ifp->tokenized) {
5250                         ifp->valid_lft = 0;
5251                         ifp->prefered_lft = 0;
5252                 }
5253                 spin_unlock(&ifp->lock);
5254         }
5255
5256         write_unlock_bh(&idev->lock);
5257         inet6_ifinfo_notify(RTM_NEWLINK, idev);
5258         addrconf_verify_rtnl();
5259         return 0;
5260 }
5261
5262 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5263         [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
5264         [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
5265 };
5266
5267 static int inet6_validate_link_af(const struct net_device *dev,
5268                                   const struct nlattr *nla)
5269 {
5270         struct nlattr *tb[IFLA_INET6_MAX + 1];
5271
5272         if (dev && !__in6_dev_get(dev))
5273                 return -EAFNOSUPPORT;
5274
5275         return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5276                                 NULL);
5277 }
5278
5279 static int check_addr_gen_mode(int mode)
5280 {
5281         if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5282             mode != IN6_ADDR_GEN_MODE_NONE &&
5283             mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5284             mode != IN6_ADDR_GEN_MODE_RANDOM)
5285                 return -EINVAL;
5286         return 1;
5287 }
5288
5289 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5290                                 int mode)
5291 {
5292         if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5293             !idev->cnf.stable_secret.initialized &&
5294             !net->ipv6.devconf_dflt->stable_secret.initialized)
5295                 return -EINVAL;
5296         return 1;
5297 }
5298
5299 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5300 {
5301         int err = -EINVAL;
5302         struct inet6_dev *idev = __in6_dev_get(dev);
5303         struct nlattr *tb[IFLA_INET6_MAX + 1];
5304
5305         if (!idev)
5306                 return -EAFNOSUPPORT;
5307
5308         if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5309                 BUG();
5310
5311         if (tb[IFLA_INET6_TOKEN]) {
5312                 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5313                 if (err)
5314                         return err;
5315         }
5316
5317         if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5318                 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5319
5320                 if (check_addr_gen_mode(mode) < 0 ||
5321                     check_stable_privacy(idev, dev_net(dev), mode) < 0)
5322                         return -EINVAL;
5323
5324                 idev->cnf.addr_gen_mode = mode;
5325                 err = 0;
5326         }
5327
5328         return err;
5329 }
5330
5331 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5332                              u32 portid, u32 seq, int event, unsigned int flags)
5333 {
5334         struct net_device *dev = idev->dev;
5335         struct ifinfomsg *hdr;
5336         struct nlmsghdr *nlh;
5337         void *protoinfo;
5338
5339         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5340         if (!nlh)
5341                 return -EMSGSIZE;
5342
5343         hdr = nlmsg_data(nlh);
5344         hdr->ifi_family = AF_INET6;
5345         hdr->__ifi_pad = 0;
5346         hdr->ifi_type = dev->type;
5347         hdr->ifi_index = dev->ifindex;
5348         hdr->ifi_flags = dev_get_flags(dev);
5349         hdr->ifi_change = 0;
5350
5351         if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5352             (dev->addr_len &&
5353              nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5354             nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5355             (dev->ifindex != dev_get_iflink(dev) &&
5356              nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5357             nla_put_u8(skb, IFLA_OPERSTATE,
5358                        netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5359                 goto nla_put_failure;
5360         protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5361         if (!protoinfo)
5362                 goto nla_put_failure;
5363
5364         if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5365                 goto nla_put_failure;
5366
5367         nla_nest_end(skb, protoinfo);
5368         nlmsg_end(skb, nlh);
5369         return 0;
5370
5371 nla_put_failure:
5372         nlmsg_cancel(skb, nlh);
5373         return -EMSGSIZE;
5374 }
5375
5376 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5377 {
5378         struct net *net = sock_net(skb->sk);
5379         int h, s_h;
5380         int idx = 0, s_idx;
5381         struct net_device *dev;
5382         struct inet6_dev *idev;
5383         struct hlist_head *head;
5384
5385         s_h = cb->args[0];
5386         s_idx = cb->args[1];
5387
5388         rcu_read_lock();
5389         for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5390                 idx = 0;
5391                 head = &net->dev_index_head[h];
5392                 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5393                         if (idx < s_idx)
5394                                 goto cont;
5395                         idev = __in6_dev_get(dev);
5396                         if (!idev)
5397                                 goto cont;
5398                         if (inet6_fill_ifinfo(skb, idev,
5399                                               NETLINK_CB(cb->skb).portid,
5400                                               cb->nlh->nlmsg_seq,
5401                                               RTM_NEWLINK, NLM_F_MULTI) < 0)
5402                                 goto out;
5403 cont:
5404                         idx++;
5405                 }
5406         }
5407 out:
5408         rcu_read_unlock();
5409         cb->args[1] = idx;
5410         cb->args[0] = h;
5411
5412         return skb->len;
5413 }
5414
5415 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5416 {
5417         struct sk_buff *skb;
5418         struct net *net = dev_net(idev->dev);
5419         int err = -ENOBUFS;
5420
5421         skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5422         if (!skb)
5423                 goto errout;
5424
5425         err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5426         if (err < 0) {
5427                 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5428                 WARN_ON(err == -EMSGSIZE);
5429                 kfree_skb(skb);
5430                 goto errout;
5431         }
5432         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5433         return;
5434 errout:
5435         if (err < 0)
5436                 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5437 }
5438
5439 static inline size_t inet6_prefix_nlmsg_size(void)
5440 {
5441         return NLMSG_ALIGN(sizeof(struct prefixmsg))
5442                + nla_total_size(sizeof(struct in6_addr))
5443                + nla_total_size(sizeof(struct prefix_cacheinfo));
5444 }
5445
5446 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5447                              struct prefix_info *pinfo, u32 portid, u32 seq,
5448                              int event, unsigned int flags)
5449 {
5450         struct prefixmsg *pmsg;
5451         struct nlmsghdr *nlh;
5452         struct prefix_cacheinfo ci;
5453
5454         nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5455         if (!nlh)
5456                 return -EMSGSIZE;
5457
5458         pmsg = nlmsg_data(nlh);
5459         pmsg->prefix_family = AF_INET6;
5460         pmsg->prefix_pad1 = 0;
5461         pmsg->prefix_pad2 = 0;
5462         pmsg->prefix_ifindex = idev->dev->ifindex;
5463         pmsg->prefix_len = pinfo->prefix_len;
5464         pmsg->prefix_type = pinfo->type;
5465         pmsg->prefix_pad3 = 0;
5466         pmsg->prefix_flags = 0;
5467         if (pinfo->onlink)
5468                 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5469         if (pinfo->autoconf)
5470                 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5471
5472         if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5473                 goto nla_put_failure;
5474         ci.preferred_time = ntohl(pinfo->prefered);
5475         ci.valid_time = ntohl(pinfo->valid);
5476         if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5477                 goto nla_put_failure;
5478         nlmsg_end(skb, nlh);
5479         return 0;
5480
5481 nla_put_failure:
5482         nlmsg_cancel(skb, nlh);
5483         return -EMSGSIZE;
5484 }
5485
5486 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5487                          struct prefix_info *pinfo)
5488 {
5489         struct sk_buff *skb;
5490         struct net *net = dev_net(idev->dev);
5491         int err = -ENOBUFS;
5492
5493         skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5494         if (!skb)
5495                 goto errout;
5496
5497         err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5498         if (err < 0) {
5499                 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5500                 WARN_ON(err == -EMSGSIZE);
5501                 kfree_skb(skb);
5502                 goto errout;
5503         }
5504         rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5505         return;
5506 errout:
5507         if (err < 0)
5508                 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5509 }
5510
5511 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5512 {
5513         struct net *net = dev_net(ifp->idev->dev);
5514
5515         if (event)
5516                 ASSERT_RTNL();
5517
5518         inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5519
5520         switch (event) {
5521         case RTM_NEWADDR:
5522                 /*
5523                  * If the address was optimistic
5524                  * we inserted the route at the start of
5525                  * our DAD process, so we don't need
5526                  * to do it again
5527                  */
5528                 if (!(ifp->rt->rt6i_node))
5529                         ip6_ins_rt(ifp->rt);
5530                 if (ifp->idev->cnf.forwarding)
5531                         addrconf_join_anycast(ifp);
5532                 if (!ipv6_addr_any(&ifp->peer_addr))
5533                         addrconf_prefix_route(&ifp->peer_addr, 128,
5534                                               ifp->idev->dev, 0, 0);
5535                 break;
5536         case RTM_DELADDR:
5537                 if (ifp->idev->cnf.forwarding)
5538                         addrconf_leave_anycast(ifp);
5539                 addrconf_leave_solict(ifp->idev, &ifp->addr);
5540                 if (!ipv6_addr_any(&ifp->peer_addr)) {
5541                         struct rt6_info *rt;
5542
5543                         rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5544                                                        ifp->idev->dev, 0, 0);
5545                         if (rt)
5546                                 ip6_del_rt(rt);
5547                 }
5548                 if (ifp->rt) {
5549                         dst_hold(&ifp->rt->dst);
5550                         ip6_del_rt(ifp->rt);
5551                 }
5552                 rt_genid_bump_ipv6(net);
5553                 break;
5554         }
5555         atomic_inc(&net->ipv6.dev_addr_genid);
5556 }
5557
5558 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5559 {
5560         rcu_read_lock_bh();
5561         if (likely(ifp->idev->dead == 0))
5562                 __ipv6_ifa_notify(event, ifp);
5563         rcu_read_unlock_bh();
5564 }
5565
5566 #ifdef CONFIG_SYSCTL
5567
5568 static
5569 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5570                            void __user *buffer, size_t *lenp, loff_t *ppos)
5571 {
5572         int *valp = ctl->data;
5573         int val = *valp;
5574         loff_t pos = *ppos;
5575         struct ctl_table lctl;
5576         int ret;
5577
5578         /*
5579          * ctl->data points to idev->cnf.forwarding, we should
5580          * not modify it until we get the rtnl lock.
5581          */
5582         lctl = *ctl;
5583         lctl.data = &val;
5584
5585         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5586
5587         if (write)
5588                 ret = addrconf_fixup_forwarding(ctl, valp, val);
5589         if (ret)
5590                 *ppos = pos;
5591         return ret;
5592 }
5593
5594 static
5595 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5596                         void __user *buffer, size_t *lenp, loff_t *ppos)
5597 {
5598         struct inet6_dev *idev = ctl->extra1;
5599         int min_mtu = IPV6_MIN_MTU;
5600         struct ctl_table lctl;
5601
5602         lctl = *ctl;
5603         lctl.extra1 = &min_mtu;
5604         lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5605
5606         return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5607 }
5608
5609 static void dev_disable_change(struct inet6_dev *idev)
5610 {
5611         struct netdev_notifier_info info;
5612
5613         if (!idev || !idev->dev)
5614                 return;
5615
5616         netdev_notifier_info_init(&info, idev->dev);
5617         if (idev->cnf.disable_ipv6)
5618                 addrconf_notify(NULL, NETDEV_DOWN, &info);
5619         else
5620                 addrconf_notify(NULL, NETDEV_UP, &info);
5621 }
5622
5623 static void addrconf_disable_change(struct net *net, __s32 newf)
5624 {
5625         struct net_device *dev;
5626         struct inet6_dev *idev;
5627
5628         for_each_netdev(net, dev) {
5629                 idev = __in6_dev_get(dev);
5630                 if (idev) {
5631                         int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5632                         idev->cnf.disable_ipv6 = newf;
5633                         if (changed)
5634                                 dev_disable_change(idev);
5635                 }
5636         }
5637 }
5638
5639 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5640 {
5641         struct net *net;
5642         int old;
5643
5644         if (!rtnl_trylock())
5645                 return restart_syscall();
5646
5647         net = (struct net *)table->extra2;
5648         old = *p;
5649         *p = newf;
5650
5651         if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5652                 rtnl_unlock();
5653                 return 0;
5654         }
5655
5656         if (p == &net->ipv6.devconf_all->disable_ipv6) {
5657                 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5658                 addrconf_disable_change(net, newf);
5659         } else if ((!newf) ^ (!old))
5660                 dev_disable_change((struct inet6_dev *)table->extra1);
5661
5662         rtnl_unlock();
5663         return 0;
5664 }
5665
5666 static
5667 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5668                             void __user *buffer, size_t *lenp, loff_t *ppos)
5669 {
5670         int *valp = ctl->data;
5671         int val = *valp;
5672         loff_t pos = *ppos;
5673         struct ctl_table lctl;
5674         int ret;
5675
5676         /*
5677          * ctl->data points to idev->cnf.disable_ipv6, we should
5678          * not modify it until we get the rtnl lock.
5679          */
5680         lctl = *ctl;
5681         lctl.data = &val;
5682
5683         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5684
5685         if (write)
5686                 ret = addrconf_disable_ipv6(ctl, valp, val);
5687         if (ret)
5688                 *ppos = pos;
5689         return ret;
5690 }
5691
5692 static
5693 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5694                               void __user *buffer, size_t *lenp, loff_t *ppos)
5695 {
5696         int *valp = ctl->data;
5697         int ret;
5698         int old, new;
5699
5700         old = *valp;
5701         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5702         new = *valp;
5703
5704         if (write && old != new) {
5705                 struct net *net = ctl->extra2;
5706
5707                 if (!rtnl_trylock())
5708                         return restart_syscall();
5709
5710                 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5711                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5712                                                      NETCONFA_PROXY_NEIGH,
5713                                                      NETCONFA_IFINDEX_DEFAULT,
5714                                                      net->ipv6.devconf_dflt);
5715                 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5716                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5717                                                      NETCONFA_PROXY_NEIGH,
5718                                                      NETCONFA_IFINDEX_ALL,
5719                                                      net->ipv6.devconf_all);
5720                 else {
5721                         struct inet6_dev *idev = ctl->extra1;
5722
5723                         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5724                                                      NETCONFA_PROXY_NEIGH,
5725                                                      idev->dev->ifindex,
5726                                                      &idev->cnf);
5727                 }
5728                 rtnl_unlock();
5729         }
5730
5731         return ret;
5732 }
5733
5734 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5735                                          void __user *buffer, size_t *lenp,
5736                                          loff_t *ppos)
5737 {
5738         int ret = 0;
5739         int new_val;
5740         struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5741         struct net *net = (struct net *)ctl->extra2;
5742
5743         if (!rtnl_trylock())
5744                 return restart_syscall();
5745
5746         ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5747
5748         if (write) {
5749                 new_val = *((int *)ctl->data);
5750
5751                 if (check_addr_gen_mode(new_val) < 0) {
5752                         ret = -EINVAL;
5753                         goto out;
5754                 }
5755
5756                 /* request for default */
5757                 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5758                         ipv6_devconf_dflt.addr_gen_mode = new_val;
5759
5760                 /* request for individual net device */
5761                 } else {
5762                         if (!idev)
5763                                 goto out;
5764
5765                         if (check_stable_privacy(idev, net, new_val) < 0) {
5766                                 ret = -EINVAL;
5767                                 goto out;
5768                         }
5769
5770                         if (idev->cnf.addr_gen_mode != new_val) {
5771                                 idev->cnf.addr_gen_mode = new_val;
5772                                 addrconf_dev_config(idev->dev);
5773                         }
5774                 }
5775         }
5776
5777 out:
5778         rtnl_unlock();
5779
5780         return ret;
5781 }
5782
5783 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5784                                          void __user *buffer, size_t *lenp,
5785                                          loff_t *ppos)
5786 {
5787         int err;
5788         struct in6_addr addr;
5789         char str[IPV6_MAX_STRLEN];
5790         struct ctl_table lctl = *ctl;
5791         struct net *net = ctl->extra2;
5792         struct ipv6_stable_secret *secret = ctl->data;
5793
5794         if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5795                 return -EIO;
5796
5797         lctl.maxlen = IPV6_MAX_STRLEN;
5798         lctl.data = str;
5799
5800         if (!rtnl_trylock())
5801                 return restart_syscall();
5802
5803         if (!write && !secret->initialized) {
5804                 err = -EIO;
5805                 goto out;
5806         }
5807
5808         err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5809         if (err >= sizeof(str)) {
5810                 err = -EIO;
5811                 goto out;
5812         }
5813
5814         err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5815         if (err || !write)
5816                 goto out;
5817
5818         if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5819                 err = -EIO;
5820                 goto out;
5821         }
5822
5823         secret->initialized = true;
5824         secret->secret = addr;
5825
5826         if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5827                 struct net_device *dev;
5828
5829                 for_each_netdev(net, dev) {
5830                         struct inet6_dev *idev = __in6_dev_get(dev);
5831
5832                         if (idev) {
5833                                 idev->cnf.addr_gen_mode =
5834                                         IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5835                         }
5836                 }
5837         } else {
5838                 struct inet6_dev *idev = ctl->extra1;
5839
5840                 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5841         }
5842
5843 out:
5844         rtnl_unlock();
5845
5846         return err;
5847 }
5848
5849 static
5850 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5851                                                 int write,
5852                                                 void __user *buffer,
5853                                                 size_t *lenp,
5854                                                 loff_t *ppos)
5855 {
5856         int *valp = ctl->data;
5857         int val = *valp;
5858         loff_t pos = *ppos;
5859         struct ctl_table lctl;
5860         int ret;
5861
5862         /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5863          * we should not modify it until we get the rtnl lock.
5864          */
5865         lctl = *ctl;
5866         lctl.data = &val;
5867
5868         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5869
5870         if (write)
5871                 ret = addrconf_fixup_linkdown(ctl, valp, val);
5872         if (ret)
5873                 *ppos = pos;
5874         return ret;
5875 }
5876
5877 static
5878 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5879 {
5880         if (rt) {
5881                 if (action)
5882                         rt->dst.flags |= DST_NOPOLICY;
5883                 else
5884                         rt->dst.flags &= ~DST_NOPOLICY;
5885         }
5886 }
5887
5888 static
5889 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5890 {
5891         struct inet6_ifaddr *ifa;
5892
5893         read_lock_bh(&idev->lock);
5894         list_for_each_entry(ifa, &idev->addr_list, if_list) {
5895                 spin_lock(&ifa->lock);
5896                 if (ifa->rt) {
5897                         struct rt6_info *rt = ifa->rt;
5898                         struct fib6_table *table = rt->rt6i_table;
5899                         int cpu;
5900
5901                         read_lock(&table->tb6_lock);
5902                         addrconf_set_nopolicy(ifa->rt, val);
5903                         if (rt->rt6i_pcpu) {
5904                                 for_each_possible_cpu(cpu) {
5905                                         struct rt6_info **rtp;
5906
5907                                         rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5908                                         addrconf_set_nopolicy(*rtp, val);
5909                                 }
5910                         }
5911                         read_unlock(&table->tb6_lock);
5912                 }
5913                 spin_unlock(&ifa->lock);
5914         }
5915         read_unlock_bh(&idev->lock);
5916 }
5917
5918 static
5919 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5920 {
5921         struct inet6_dev *idev;
5922         struct net *net;
5923
5924         if (!rtnl_trylock())
5925                 return restart_syscall();
5926
5927         *valp = val;
5928
5929         net = (struct net *)ctl->extra2;
5930         if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5931                 rtnl_unlock();
5932                 return 0;
5933         }
5934
5935         if (valp == &net->ipv6.devconf_all->disable_policy)  {
5936                 struct net_device *dev;
5937
5938                 for_each_netdev(net, dev) {
5939                         idev = __in6_dev_get(dev);
5940                         if (idev)
5941                                 addrconf_disable_policy_idev(idev, val);
5942                 }
5943         } else {
5944                 idev = (struct inet6_dev *)ctl->extra1;
5945                 addrconf_disable_policy_idev(idev, val);
5946         }
5947
5948         rtnl_unlock();
5949         return 0;
5950 }
5951
5952 static
5953 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5954                                    void __user *buffer, size_t *lenp,
5955                                    loff_t *ppos)
5956 {
5957         int *valp = ctl->data;
5958         int val = *valp;
5959         loff_t pos = *ppos;
5960         struct ctl_table lctl;
5961         int ret;
5962
5963         lctl = *ctl;
5964         lctl.data = &val;
5965         ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5966
5967         if (write && (*valp != val))
5968                 ret = addrconf_disable_policy(ctl, valp, val);
5969
5970         if (ret)
5971                 *ppos = pos;
5972
5973         return ret;
5974 }
5975
5976 static int minus_one = -1;
5977 static const int one = 1;
5978 static const int two_five_five = 255;
5979
5980 static const struct ctl_table addrconf_sysctl[] = {
5981         {
5982                 .procname       = "forwarding",
5983                 .data           = &ipv6_devconf.forwarding,
5984                 .maxlen         = sizeof(int),
5985                 .mode           = 0644,
5986                 .proc_handler   = addrconf_sysctl_forward,
5987         },
5988         {
5989                 .procname       = "hop_limit",
5990                 .data           = &ipv6_devconf.hop_limit,
5991                 .maxlen         = sizeof(int),
5992                 .mode           = 0644,
5993                 .proc_handler   = proc_dointvec_minmax,
5994                 .extra1         = (void *)&one,
5995                 .extra2         = (void *)&two_five_five,
5996         },
5997         {
5998                 .procname       = "mtu",
5999                 .data           = &ipv6_devconf.mtu6,
6000                 .maxlen         = sizeof(int),
6001                 .mode           = 0644,
6002                 .proc_handler   = addrconf_sysctl_mtu,
6003         },
6004         {
6005                 .procname       = "accept_ra",
6006                 .data           = &ipv6_devconf.accept_ra,
6007                 .maxlen         = sizeof(int),
6008                 .mode           = 0644,
6009                 .proc_handler   = proc_dointvec,
6010         },
6011         {
6012                 .procname       = "accept_redirects",
6013                 .data           = &ipv6_devconf.accept_redirects,
6014                 .maxlen         = sizeof(int),
6015                 .mode           = 0644,
6016                 .proc_handler   = proc_dointvec,
6017         },
6018         {
6019                 .procname       = "autoconf",
6020                 .data           = &ipv6_devconf.autoconf,
6021                 .maxlen         = sizeof(int),
6022                 .mode           = 0644,
6023                 .proc_handler   = proc_dointvec,
6024         },
6025         {
6026                 .procname       = "dad_transmits",
6027                 .data           = &ipv6_devconf.dad_transmits,
6028                 .maxlen         = sizeof(int),
6029                 .mode           = 0644,
6030                 .proc_handler   = proc_dointvec,
6031         },
6032         {
6033                 .procname       = "router_solicitations",
6034                 .data           = &ipv6_devconf.rtr_solicits,
6035                 .maxlen         = sizeof(int),
6036                 .mode           = 0644,
6037                 .proc_handler   = proc_dointvec_minmax,
6038                 .extra1         = &minus_one,
6039         },
6040         {
6041                 .procname       = "router_solicitation_interval",
6042                 .data           = &ipv6_devconf.rtr_solicit_interval,
6043                 .maxlen         = sizeof(int),
6044                 .mode           = 0644,
6045                 .proc_handler   = proc_dointvec_jiffies,
6046         },
6047         {
6048                 .procname       = "router_solicitation_max_interval",
6049                 .data           = &ipv6_devconf.rtr_solicit_max_interval,
6050                 .maxlen         = sizeof(int),
6051                 .mode           = 0644,
6052                 .proc_handler   = proc_dointvec_jiffies,
6053         },
6054         {
6055                 .procname       = "router_solicitation_delay",
6056                 .data           = &ipv6_devconf.rtr_solicit_delay,
6057                 .maxlen         = sizeof(int),
6058                 .mode           = 0644,
6059                 .proc_handler   = proc_dointvec_jiffies,
6060         },
6061         {
6062                 .procname       = "force_mld_version",
6063                 .data           = &ipv6_devconf.force_mld_version,
6064                 .maxlen         = sizeof(int),
6065                 .mode           = 0644,
6066                 .proc_handler   = proc_dointvec,
6067         },
6068         {
6069                 .procname       = "mldv1_unsolicited_report_interval",
6070                 .data           =
6071                         &ipv6_devconf.mldv1_unsolicited_report_interval,
6072                 .maxlen         = sizeof(int),
6073                 .mode           = 0644,
6074                 .proc_handler   = proc_dointvec_ms_jiffies,
6075         },
6076         {
6077                 .procname       = "mldv2_unsolicited_report_interval",
6078                 .data           =
6079                         &ipv6_devconf.mldv2_unsolicited_report_interval,
6080                 .maxlen         = sizeof(int),
6081                 .mode           = 0644,
6082                 .proc_handler   = proc_dointvec_ms_jiffies,
6083         },
6084         {
6085                 .procname       = "use_tempaddr",
6086                 .data           = &ipv6_devconf.use_tempaddr,
6087                 .maxlen         = sizeof(int),
6088                 .mode           = 0644,
6089                 .proc_handler   = proc_dointvec,
6090         },
6091         {
6092                 .procname       = "temp_valid_lft",
6093                 .data           = &ipv6_devconf.temp_valid_lft,
6094                 .maxlen         = sizeof(int),
6095                 .mode           = 0644,
6096                 .proc_handler   = proc_dointvec,
6097         },
6098         {
6099                 .procname       = "temp_prefered_lft",
6100                 .data           = &ipv6_devconf.temp_prefered_lft,
6101                 .maxlen         = sizeof(int),
6102                 .mode           = 0644,
6103                 .proc_handler   = proc_dointvec,
6104         },
6105         {
6106                 .procname       = "regen_max_retry",
6107                 .data           = &ipv6_devconf.regen_max_retry,
6108                 .maxlen         = sizeof(int),
6109                 .mode           = 0644,
6110                 .proc_handler   = proc_dointvec,
6111         },
6112         {
6113                 .procname       = "max_desync_factor",
6114                 .data           = &ipv6_devconf.max_desync_factor,
6115                 .maxlen         = sizeof(int),
6116                 .mode           = 0644,
6117                 .proc_handler   = proc_dointvec,
6118         },
6119         {
6120                 .procname       = "max_addresses",
6121                 .data           = &ipv6_devconf.max_addresses,
6122                 .maxlen         = sizeof(int),
6123                 .mode           = 0644,
6124                 .proc_handler   = proc_dointvec,
6125         },
6126         {
6127                 .procname       = "accept_ra_defrtr",
6128                 .data           = &ipv6_devconf.accept_ra_defrtr,
6129                 .maxlen         = sizeof(int),
6130                 .mode           = 0644,
6131                 .proc_handler   = proc_dointvec,
6132         },
6133         {
6134                 .procname       = "accept_ra_min_hop_limit",
6135                 .data           = &ipv6_devconf.accept_ra_min_hop_limit,
6136                 .maxlen         = sizeof(int),
6137                 .mode           = 0644,
6138                 .proc_handler   = proc_dointvec,
6139         },
6140         {
6141                 .procname       = "accept_ra_pinfo",
6142                 .data           = &ipv6_devconf.accept_ra_pinfo,
6143                 .maxlen         = sizeof(int),
6144                 .mode           = 0644,
6145                 .proc_handler   = proc_dointvec,
6146         },
6147 #ifdef CONFIG_IPV6_ROUTER_PREF
6148         {
6149                 .procname       = "accept_ra_rtr_pref",
6150                 .data           = &ipv6_devconf.accept_ra_rtr_pref,
6151                 .maxlen         = sizeof(int),
6152                 .mode           = 0644,
6153                 .proc_handler   = proc_dointvec,
6154         },
6155         {
6156                 .procname       = "router_probe_interval",
6157                 .data           = &ipv6_devconf.rtr_probe_interval,
6158                 .maxlen         = sizeof(int),
6159                 .mode           = 0644,
6160                 .proc_handler   = proc_dointvec_jiffies,
6161         },
6162 #ifdef CONFIG_IPV6_ROUTE_INFO
6163         {
6164                 .procname       = "accept_ra_rt_info_min_plen",
6165                 .data           = &ipv6_devconf.accept_ra_rt_info_min_plen,
6166                 .maxlen         = sizeof(int),
6167                 .mode           = 0644,
6168                 .proc_handler   = proc_dointvec,
6169         },
6170         {
6171                 .procname       = "accept_ra_rt_info_max_plen",
6172                 .data           = &ipv6_devconf.accept_ra_rt_info_max_plen,
6173                 .maxlen         = sizeof(int),
6174                 .mode           = 0644,
6175                 .proc_handler   = proc_dointvec,
6176         },
6177 #endif
6178 #endif
6179         {
6180                 .procname       = "proxy_ndp",
6181                 .data           = &ipv6_devconf.proxy_ndp,
6182                 .maxlen         = sizeof(int),
6183                 .mode           = 0644,
6184                 .proc_handler   = addrconf_sysctl_proxy_ndp,
6185         },
6186         {
6187                 .procname       = "accept_source_route",
6188                 .data           = &ipv6_devconf.accept_source_route,
6189                 .maxlen         = sizeof(int),
6190                 .mode           = 0644,
6191                 .proc_handler   = proc_dointvec,
6192         },
6193 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6194         {
6195                 .procname       = "optimistic_dad",
6196                 .data           = &ipv6_devconf.optimistic_dad,
6197                 .maxlen         = sizeof(int),
6198                 .mode           = 0644,
6199                 .proc_handler   = proc_dointvec,
6200         },
6201         {
6202                 .procname       = "use_optimistic",
6203                 .data           = &ipv6_devconf.use_optimistic,
6204                 .maxlen         = sizeof(int),
6205                 .mode           = 0644,
6206                 .proc_handler   = proc_dointvec,
6207         },
6208 #endif
6209 #ifdef CONFIG_IPV6_MROUTE
6210         {
6211                 .procname       = "mc_forwarding",
6212                 .data           = &ipv6_devconf.mc_forwarding,
6213                 .maxlen         = sizeof(int),
6214                 .mode           = 0444,
6215                 .proc_handler   = proc_dointvec,
6216         },
6217 #endif
6218         {
6219                 .procname       = "disable_ipv6",
6220                 .data           = &ipv6_devconf.disable_ipv6,
6221                 .maxlen         = sizeof(int),
6222                 .mode           = 0644,
6223                 .proc_handler   = addrconf_sysctl_disable,
6224         },
6225         {
6226                 .procname       = "accept_dad",
6227                 .data           = &ipv6_devconf.accept_dad,
6228                 .maxlen         = sizeof(int),
6229                 .mode           = 0644,
6230                 .proc_handler   = proc_dointvec,
6231         },
6232         {
6233                 .procname       = "force_tllao",
6234                 .data           = &ipv6_devconf.force_tllao,
6235                 .maxlen         = sizeof(int),
6236                 .mode           = 0644,
6237                 .proc_handler   = proc_dointvec
6238         },
6239         {
6240                 .procname       = "ndisc_notify",
6241                 .data           = &ipv6_devconf.ndisc_notify,
6242                 .maxlen         = sizeof(int),
6243                 .mode           = 0644,
6244                 .proc_handler   = proc_dointvec
6245         },
6246         {
6247                 .procname       = "suppress_frag_ndisc",
6248                 .data           = &ipv6_devconf.suppress_frag_ndisc,
6249                 .maxlen         = sizeof(int),
6250                 .mode           = 0644,
6251                 .proc_handler   = proc_dointvec
6252         },
6253         {
6254                 .procname       = "accept_ra_from_local",
6255                 .data           = &ipv6_devconf.accept_ra_from_local,
6256                 .maxlen         = sizeof(int),
6257                 .mode           = 0644,
6258                 .proc_handler   = proc_dointvec,
6259         },
6260         {
6261                 .procname       = "accept_ra_mtu",
6262                 .data           = &ipv6_devconf.accept_ra_mtu,
6263                 .maxlen         = sizeof(int),
6264                 .mode           = 0644,
6265                 .proc_handler   = proc_dointvec,
6266         },
6267         {
6268                 .procname       = "stable_secret",
6269                 .data           = &ipv6_devconf.stable_secret,
6270                 .maxlen         = IPV6_MAX_STRLEN,
6271                 .mode           = 0600,
6272                 .proc_handler   = addrconf_sysctl_stable_secret,
6273         },
6274         {
6275                 .procname       = "use_oif_addrs_only",
6276                 .data           = &ipv6_devconf.use_oif_addrs_only,
6277                 .maxlen         = sizeof(int),
6278                 .mode           = 0644,
6279                 .proc_handler   = proc_dointvec,
6280         },
6281         {
6282                 .procname       = "ignore_routes_with_linkdown",
6283                 .data           = &ipv6_devconf.ignore_routes_with_linkdown,
6284                 .maxlen         = sizeof(int),
6285                 .mode           = 0644,
6286                 .proc_handler   = addrconf_sysctl_ignore_routes_with_linkdown,
6287         },
6288         {
6289                 .procname       = "drop_unicast_in_l2_multicast",
6290                 .data           = &ipv6_devconf.drop_unicast_in_l2_multicast,
6291                 .maxlen         = sizeof(int),
6292                 .mode           = 0644,
6293                 .proc_handler   = proc_dointvec,
6294         },
6295         {
6296                 .procname       = "drop_unsolicited_na",
6297                 .data           = &ipv6_devconf.drop_unsolicited_na,
6298                 .maxlen         = sizeof(int),
6299                 .mode           = 0644,
6300                 .proc_handler   = proc_dointvec,
6301         },
6302         {
6303                 .procname       = "keep_addr_on_down",
6304                 .data           = &ipv6_devconf.keep_addr_on_down,
6305                 .maxlen         = sizeof(int),
6306                 .mode           = 0644,
6307                 .proc_handler   = proc_dointvec,
6308
6309         },
6310         {
6311                 .procname       = "seg6_enabled",
6312                 .data           = &ipv6_devconf.seg6_enabled,
6313                 .maxlen         = sizeof(int),
6314                 .mode           = 0644,
6315                 .proc_handler   = proc_dointvec,
6316         },
6317 #ifdef CONFIG_IPV6_SEG6_HMAC
6318         {
6319                 .procname       = "seg6_require_hmac",
6320                 .data           = &ipv6_devconf.seg6_require_hmac,
6321                 .maxlen         = sizeof(int),
6322                 .mode           = 0644,
6323                 .proc_handler   = proc_dointvec,
6324         },
6325 #endif
6326         {
6327                 .procname       = "enhanced_dad",
6328                 .data           = &ipv6_devconf.enhanced_dad,
6329                 .maxlen         = sizeof(int),
6330                 .mode           = 0644,
6331                 .proc_handler   = proc_dointvec,
6332         },
6333         {
6334                 .procname               = "addr_gen_mode",
6335                 .data                   = &ipv6_devconf.addr_gen_mode,
6336                 .maxlen                 = sizeof(int),
6337                 .mode                   = 0644,
6338                 .proc_handler   = addrconf_sysctl_addr_gen_mode,
6339         },
6340         {
6341                 .procname       = "disable_policy",
6342                 .data           = &ipv6_devconf.disable_policy,
6343                 .maxlen         = sizeof(int),
6344                 .mode           = 0644,
6345                 .proc_handler   = addrconf_sysctl_disable_policy,
6346         },
6347         {
6348                 /* sentinel */
6349         }
6350 };
6351
6352 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6353                 struct inet6_dev *idev, struct ipv6_devconf *p)
6354 {
6355         int i, ifindex;
6356         struct ctl_table *table;
6357         char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6358
6359         table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6360         if (!table)
6361                 goto out;
6362
6363         for (i = 0; table[i].data; i++) {
6364                 table[i].data += (char *)p - (char *)&ipv6_devconf;
6365                 /* If one of these is already set, then it is not safe to
6366                  * overwrite either of them: this makes proc_dointvec_minmax
6367                  * usable.
6368                  */
6369                 if (!table[i].extra1 && !table[i].extra2) {
6370                         table[i].extra1 = idev; /* embedded; no ref */
6371                         table[i].extra2 = net;
6372                 }
6373         }
6374
6375         snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6376
6377         p->sysctl_header = register_net_sysctl(net, path, table);
6378         if (!p->sysctl_header)
6379                 goto free;
6380
6381         if (!strcmp(dev_name, "all"))
6382                 ifindex = NETCONFA_IFINDEX_ALL;
6383         else if (!strcmp(dev_name, "default"))
6384                 ifindex = NETCONFA_IFINDEX_DEFAULT;
6385         else
6386                 ifindex = idev->dev->ifindex;
6387         inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6388                                      ifindex, p);
6389         return 0;
6390
6391 free:
6392         kfree(table);
6393 out:
6394         return -ENOBUFS;
6395 }
6396
6397 static void __addrconf_sysctl_unregister(struct net *net,
6398                                          struct ipv6_devconf *p, int ifindex)
6399 {
6400         struct ctl_table *table;
6401
6402         if (!p->sysctl_header)
6403                 return;
6404
6405         table = p->sysctl_header->ctl_table_arg;
6406         unregister_net_sysctl_table(p->sysctl_header);
6407         p->sysctl_header = NULL;
6408         kfree(table);
6409
6410         inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6411 }
6412
6413 static int addrconf_sysctl_register(struct inet6_dev *idev)
6414 {
6415         int err;
6416
6417         if (!sysctl_dev_name_is_allowed(idev->dev->name))
6418                 return -EINVAL;
6419
6420         err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6421                                     &ndisc_ifinfo_sysctl_change);
6422         if (err)
6423                 return err;
6424         err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6425                                          idev, &idev->cnf);
6426         if (err)
6427                 neigh_sysctl_unregister(idev->nd_parms);
6428
6429         return err;
6430 }
6431
6432 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6433 {
6434         __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6435                                      idev->dev->ifindex);
6436         neigh_sysctl_unregister(idev->nd_parms);
6437 }
6438
6439
6440 #endif
6441
6442 static int __net_init addrconf_init_net(struct net *net)
6443 {
6444         int err = -ENOMEM;
6445         struct ipv6_devconf *all, *dflt;
6446
6447         all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6448         if (!all)
6449                 goto err_alloc_all;
6450
6451         dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6452         if (!dflt)
6453                 goto err_alloc_dflt;
6454
6455         /* these will be inherited by all namespaces */
6456         dflt->autoconf = ipv6_defaults.autoconf;
6457         dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6458
6459         dflt->stable_secret.initialized = false;
6460         all->stable_secret.initialized = false;
6461
6462         net->ipv6.devconf_all = all;
6463         net->ipv6.devconf_dflt = dflt;
6464
6465 #ifdef CONFIG_SYSCTL
6466         err = __addrconf_sysctl_register(net, "all", NULL, all);
6467         if (err < 0)
6468                 goto err_reg_all;
6469
6470         err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6471         if (err < 0)
6472                 goto err_reg_dflt;
6473 #endif
6474         return 0;
6475
6476 #ifdef CONFIG_SYSCTL
6477 err_reg_dflt:
6478         __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6479 err_reg_all:
6480         kfree(dflt);
6481 #endif
6482 err_alloc_dflt:
6483         kfree(all);
6484 err_alloc_all:
6485         return err;
6486 }
6487
6488 static void __net_exit addrconf_exit_net(struct net *net)
6489 {
6490 #ifdef CONFIG_SYSCTL
6491         __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6492                                      NETCONFA_IFINDEX_DEFAULT);
6493         __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6494                                      NETCONFA_IFINDEX_ALL);
6495 #endif
6496         kfree(net->ipv6.devconf_dflt);
6497         kfree(net->ipv6.devconf_all);
6498 }
6499
6500 static struct pernet_operations addrconf_ops = {
6501         .init = addrconf_init_net,
6502         .exit = addrconf_exit_net,
6503 };
6504
6505 static struct rtnl_af_ops inet6_ops __read_mostly = {
6506         .family           = AF_INET6,
6507         .fill_link_af     = inet6_fill_link_af,
6508         .get_link_af_size = inet6_get_link_af_size,
6509         .validate_link_af = inet6_validate_link_af,
6510         .set_link_af      = inet6_set_link_af,
6511 };
6512
6513 /*
6514  *      Init / cleanup code
6515  */
6516
6517 int __init addrconf_init(void)
6518 {
6519         struct inet6_dev *idev;
6520         int i, err;
6521
6522         err = ipv6_addr_label_init();
6523         if (err < 0) {
6524                 pr_crit("%s: cannot initialize default policy table: %d\n",
6525                         __func__, err);
6526                 goto out;
6527         }
6528
6529         err = register_pernet_subsys(&addrconf_ops);
6530         if (err < 0)
6531                 goto out_addrlabel;
6532
6533         addrconf_wq = create_workqueue("ipv6_addrconf");
6534         if (!addrconf_wq) {
6535                 err = -ENOMEM;
6536                 goto out_nowq;
6537         }
6538
6539         /* The addrconf netdev notifier requires that loopback_dev
6540          * has it's ipv6 private information allocated and setup
6541          * before it can bring up and give link-local addresses
6542          * to other devices which are up.
6543          *
6544          * Unfortunately, loopback_dev is not necessarily the first
6545          * entry in the global dev_base list of net devices.  In fact,
6546          * it is likely to be the very last entry on that list.
6547          * So this causes the notifier registry below to try and
6548          * give link-local addresses to all devices besides loopback_dev
6549          * first, then loopback_dev, which cases all the non-loopback_dev
6550          * devices to fail to get a link-local address.
6551          *
6552          * So, as a temporary fix, allocate the ipv6 structure for
6553          * loopback_dev first by hand.
6554          * Longer term, all of the dependencies ipv6 has upon the loopback
6555          * device and it being up should be removed.
6556          */
6557         rtnl_lock();
6558         idev = ipv6_add_dev(init_net.loopback_dev);
6559         rtnl_unlock();
6560         if (IS_ERR(idev)) {
6561                 err = PTR_ERR(idev);
6562                 goto errlo;
6563         }
6564
6565         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6566                 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6567
6568         register_netdevice_notifier(&ipv6_dev_notf);
6569
6570         addrconf_verify();
6571
6572         rtnl_af_register(&inet6_ops);
6573
6574         err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6575                               NULL);
6576         if (err < 0)
6577                 goto errout;
6578
6579         /* Only the first call to __rtnl_register can fail */
6580         __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6581         __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6582         __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6583                         inet6_dump_ifaddr, NULL);
6584         __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6585                         inet6_dump_ifmcaddr, NULL);
6586         __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6587                         inet6_dump_ifacaddr, NULL);
6588         __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6589                         inet6_netconf_dump_devconf, NULL);
6590
6591         ipv6_addr_label_rtnl_register();
6592
6593         return 0;
6594 errout:
6595         rtnl_af_unregister(&inet6_ops);
6596         unregister_netdevice_notifier(&ipv6_dev_notf);
6597 errlo:
6598         destroy_workqueue(addrconf_wq);
6599 out_nowq:
6600         unregister_pernet_subsys(&addrconf_ops);
6601 out_addrlabel:
6602         ipv6_addr_label_cleanup();
6603 out:
6604         return err;
6605 }
6606
6607 void addrconf_cleanup(void)
6608 {
6609         struct net_device *dev;
6610         int i;
6611
6612         unregister_netdevice_notifier(&ipv6_dev_notf);
6613         unregister_pernet_subsys(&addrconf_ops);
6614         ipv6_addr_label_cleanup();
6615
6616         rtnl_lock();
6617
6618         __rtnl_af_unregister(&inet6_ops);
6619
6620         /* clean dev list */
6621         for_each_netdev(&init_net, dev) {
6622                 if (__in6_dev_get(dev) == NULL)
6623                         continue;
6624                 addrconf_ifdown(dev, 1);
6625         }
6626         addrconf_ifdown(init_net.loopback_dev, 2);
6627
6628         /*
6629          *      Check hash table.
6630          */
6631         spin_lock_bh(&addrconf_hash_lock);
6632         for (i = 0; i < IN6_ADDR_HSIZE; i++)
6633                 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6634         spin_unlock_bh(&addrconf_hash_lock);
6635         cancel_delayed_work(&addr_chk_work);
6636         rtnl_unlock();
6637
6638         destroy_workqueue(addrconf_wq);
6639 }