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vti6: better validate user provided tunnel names
[GitHub/LineageOS/android_kernel_motorola_exynos9610.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 bool send_na);
189 static void addrconf_dad_run(struct inet6_dev *idev);
190 static void addrconf_rs_timer(unsigned long data);
191 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
192 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
193
194 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
195 struct prefix_info *pinfo);
196 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
197 struct net_device *dev);
198
199 static struct ipv6_devconf ipv6_devconf __read_mostly = {
200 .forwarding = 0,
201 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
202 .mtu6 = IPV6_MIN_MTU,
203 .accept_ra = 1,
204 .accept_redirects = 1,
205 .autoconf = 1,
206 .force_mld_version = 0,
207 .mldv1_unsolicited_report_interval = 10 * HZ,
208 .mldv2_unsolicited_report_interval = HZ,
209 .dad_transmits = 1,
210 .rtr_solicits = MAX_RTR_SOLICITATIONS,
211 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
212 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
213 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
214 .use_tempaddr = 0,
215 .temp_valid_lft = TEMP_VALID_LIFETIME,
216 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
217 .regen_max_retry = REGEN_MAX_RETRY,
218 .max_desync_factor = MAX_DESYNC_FACTOR,
219 .max_addresses = IPV6_MAX_ADDRESSES,
220 .accept_ra_defrtr = 1,
221 .accept_ra_from_local = 0,
222 .accept_ra_min_hop_limit= 1,
223 .accept_ra_pinfo = 1,
224 #ifdef CONFIG_IPV6_ROUTER_PREF
225 .accept_ra_rtr_pref = 1,
226 .rtr_probe_interval = 60 * HZ,
227 #ifdef CONFIG_IPV6_ROUTE_INFO
228 .accept_ra_rt_info_min_plen = 0,
229 .accept_ra_rt_info_max_plen = 0,
230 #endif
231 #endif
232 .proxy_ndp = 0,
233 .accept_source_route = 0, /* we do not accept RH0 by default. */
234 .disable_ipv6 = 0,
235 .accept_dad = 0,
236 .suppress_frag_ndisc = 1,
237 .accept_ra_mtu = 1,
238 .stable_secret = {
239 .initialized = false,
240 },
241 .use_oif_addrs_only = 0,
242 .ignore_routes_with_linkdown = 0,
243 .keep_addr_on_down = 0,
244 .seg6_enabled = 0,
245 #ifdef CONFIG_IPV6_SEG6_HMAC
246 .seg6_require_hmac = 0,
247 #endif
248 .enhanced_dad = 1,
249 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
250 .disable_policy = 0,
251 };
252
253 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
254 .forwarding = 0,
255 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
256 .mtu6 = IPV6_MIN_MTU,
257 .accept_ra = 1,
258 .accept_redirects = 1,
259 .autoconf = 1,
260 .force_mld_version = 0,
261 .mldv1_unsolicited_report_interval = 10 * HZ,
262 .mldv2_unsolicited_report_interval = HZ,
263 .dad_transmits = 1,
264 .rtr_solicits = MAX_RTR_SOLICITATIONS,
265 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
266 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
267 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
268 .use_tempaddr = 0,
269 .temp_valid_lft = TEMP_VALID_LIFETIME,
270 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
271 .regen_max_retry = REGEN_MAX_RETRY,
272 .max_desync_factor = MAX_DESYNC_FACTOR,
273 .max_addresses = IPV6_MAX_ADDRESSES,
274 .accept_ra_defrtr = 1,
275 .accept_ra_from_local = 0,
276 .accept_ra_min_hop_limit= 1,
277 .accept_ra_pinfo = 1,
278 #ifdef CONFIG_IPV6_ROUTER_PREF
279 .accept_ra_rtr_pref = 1,
280 .rtr_probe_interval = 60 * HZ,
281 #ifdef CONFIG_IPV6_ROUTE_INFO
282 .accept_ra_rt_info_min_plen = 0,
283 .accept_ra_rt_info_max_plen = 0,
284 #endif
285 #endif
286 .proxy_ndp = 0,
287 .accept_source_route = 0, /* we do not accept RH0 by default. */
288 .disable_ipv6 = 0,
289 .accept_dad = 1,
290 .suppress_frag_ndisc = 1,
291 .accept_ra_mtu = 1,
292 .stable_secret = {
293 .initialized = false,
294 },
295 .use_oif_addrs_only = 0,
296 .ignore_routes_with_linkdown = 0,
297 .keep_addr_on_down = 0,
298 .seg6_enabled = 0,
299 #ifdef CONFIG_IPV6_SEG6_HMAC
300 .seg6_require_hmac = 0,
301 #endif
302 .enhanced_dad = 1,
303 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
304 .disable_policy = 0,
305 };
306
307 /* Check if link is ready: is it up and is a valid qdisc available */
308 static inline bool addrconf_link_ready(const struct net_device *dev)
309 {
310 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
311 }
312
313 static void addrconf_del_rs_timer(struct inet6_dev *idev)
314 {
315 if (del_timer(&idev->rs_timer))
316 __in6_dev_put(idev);
317 }
318
319 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
320 {
321 if (cancel_delayed_work(&ifp->dad_work))
322 __in6_ifa_put(ifp);
323 }
324
325 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
326 unsigned long when)
327 {
328 if (!timer_pending(&idev->rs_timer))
329 in6_dev_hold(idev);
330 mod_timer(&idev->rs_timer, jiffies + when);
331 }
332
333 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
334 unsigned long delay)
335 {
336 in6_ifa_hold(ifp);
337 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
338 in6_ifa_put(ifp);
339 }
340
341 static int snmp6_alloc_dev(struct inet6_dev *idev)
342 {
343 int i;
344
345 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
346 if (!idev->stats.ipv6)
347 goto err_ip;
348
349 for_each_possible_cpu(i) {
350 struct ipstats_mib *addrconf_stats;
351 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
352 u64_stats_init(&addrconf_stats->syncp);
353 }
354
355
356 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
357 GFP_KERNEL);
358 if (!idev->stats.icmpv6dev)
359 goto err_icmp;
360 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
361 GFP_KERNEL);
362 if (!idev->stats.icmpv6msgdev)
363 goto err_icmpmsg;
364
365 return 0;
366
367 err_icmpmsg:
368 kfree(idev->stats.icmpv6dev);
369 err_icmp:
370 free_percpu(idev->stats.ipv6);
371 err_ip:
372 return -ENOMEM;
373 }
374
375 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
376 {
377 struct inet6_dev *ndev;
378 int err = -ENOMEM;
379
380 ASSERT_RTNL();
381
382 if (dev->mtu < IPV6_MIN_MTU)
383 return ERR_PTR(-EINVAL);
384
385 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
386 if (!ndev)
387 return ERR_PTR(err);
388
389 rwlock_init(&ndev->lock);
390 ndev->dev = dev;
391 INIT_LIST_HEAD(&ndev->addr_list);
392 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
393 (unsigned long)ndev);
394 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
395
396 if (ndev->cnf.stable_secret.initialized)
397 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
398 else
399 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
400
401 ndev->cnf.mtu6 = dev->mtu;
402 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
403 if (!ndev->nd_parms) {
404 kfree(ndev);
405 return ERR_PTR(err);
406 }
407 if (ndev->cnf.forwarding)
408 dev_disable_lro(dev);
409 /* We refer to the device */
410 dev_hold(dev);
411
412 if (snmp6_alloc_dev(ndev) < 0) {
413 ADBG(KERN_WARNING
414 "%s: cannot allocate memory for statistics; dev=%s.\n",
415 __func__, dev->name);
416 neigh_parms_release(&nd_tbl, ndev->nd_parms);
417 dev_put(dev);
418 kfree(ndev);
419 return ERR_PTR(err);
420 }
421
422 if (snmp6_register_dev(ndev) < 0) {
423 ADBG(KERN_WARNING
424 "%s: cannot create /proc/net/dev_snmp6/%s\n",
425 __func__, dev->name);
426 goto err_release;
427 }
428
429 /* One reference from device. */
430 refcount_set(&ndev->refcnt, 1);
431
432 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
433 ndev->cnf.accept_dad = -1;
434
435 #if IS_ENABLED(CONFIG_IPV6_SIT)
436 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
437 pr_info("%s: Disabled Multicast RS\n", dev->name);
438 ndev->cnf.rtr_solicits = 0;
439 }
440 #endif
441
442 INIT_LIST_HEAD(&ndev->tempaddr_list);
443 ndev->desync_factor = U32_MAX;
444 if ((dev->flags&IFF_LOOPBACK) ||
445 dev->type == ARPHRD_TUNNEL ||
446 dev->type == ARPHRD_TUNNEL6 ||
447 dev->type == ARPHRD_SIT ||
448 dev->type == ARPHRD_NONE) {
449 ndev->cnf.use_tempaddr = -1;
450 } else
451 ipv6_regen_rndid(ndev);
452
453 ndev->token = in6addr_any;
454
455 if (netif_running(dev) && addrconf_link_ready(dev))
456 ndev->if_flags |= IF_READY;
457
458 ipv6_mc_init_dev(ndev);
459 ndev->tstamp = jiffies;
460 err = addrconf_sysctl_register(ndev);
461 if (err) {
462 ipv6_mc_destroy_dev(ndev);
463 snmp6_unregister_dev(ndev);
464 goto err_release;
465 }
466 /* protected by rtnl_lock */
467 rcu_assign_pointer(dev->ip6_ptr, ndev);
468
469 /* Join interface-local all-node multicast group */
470 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
471
472 /* Join all-node multicast group */
473 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
474
475 /* Join all-router multicast group if forwarding is set */
476 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
477 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
478
479 return ndev;
480
481 err_release:
482 neigh_parms_release(&nd_tbl, ndev->nd_parms);
483 ndev->dead = 1;
484 in6_dev_finish_destroy(ndev);
485 return ERR_PTR(err);
486 }
487
488 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
489 {
490 struct inet6_dev *idev;
491
492 ASSERT_RTNL();
493
494 idev = __in6_dev_get(dev);
495 if (!idev) {
496 idev = ipv6_add_dev(dev);
497 if (IS_ERR(idev))
498 return NULL;
499 }
500
501 if (dev->flags&IFF_UP)
502 ipv6_mc_up(idev);
503 return idev;
504 }
505
506 static int inet6_netconf_msgsize_devconf(int type)
507 {
508 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
509 + nla_total_size(4); /* NETCONFA_IFINDEX */
510 bool all = false;
511
512 if (type == NETCONFA_ALL)
513 all = true;
514
515 if (all || type == NETCONFA_FORWARDING)
516 size += nla_total_size(4);
517 #ifdef CONFIG_IPV6_MROUTE
518 if (all || type == NETCONFA_MC_FORWARDING)
519 size += nla_total_size(4);
520 #endif
521 if (all || type == NETCONFA_PROXY_NEIGH)
522 size += nla_total_size(4);
523
524 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
525 size += nla_total_size(4);
526
527 return size;
528 }
529
530 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
531 struct ipv6_devconf *devconf, u32 portid,
532 u32 seq, int event, unsigned int flags,
533 int type)
534 {
535 struct nlmsghdr *nlh;
536 struct netconfmsg *ncm;
537 bool all = false;
538
539 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
540 flags);
541 if (!nlh)
542 return -EMSGSIZE;
543
544 if (type == NETCONFA_ALL)
545 all = true;
546
547 ncm = nlmsg_data(nlh);
548 ncm->ncm_family = AF_INET6;
549
550 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
551 goto nla_put_failure;
552
553 if (!devconf)
554 goto out;
555
556 if ((all || type == NETCONFA_FORWARDING) &&
557 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
558 goto nla_put_failure;
559 #ifdef CONFIG_IPV6_MROUTE
560 if ((all || type == NETCONFA_MC_FORWARDING) &&
561 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
562 devconf->mc_forwarding) < 0)
563 goto nla_put_failure;
564 #endif
565 if ((all || type == NETCONFA_PROXY_NEIGH) &&
566 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
567 goto nla_put_failure;
568
569 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
570 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
571 devconf->ignore_routes_with_linkdown) < 0)
572 goto nla_put_failure;
573
574 out:
575 nlmsg_end(skb, nlh);
576 return 0;
577
578 nla_put_failure:
579 nlmsg_cancel(skb, nlh);
580 return -EMSGSIZE;
581 }
582
583 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
584 int ifindex, struct ipv6_devconf *devconf)
585 {
586 struct sk_buff *skb;
587 int err = -ENOBUFS;
588
589 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
590 if (!skb)
591 goto errout;
592
593 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
594 event, 0, type);
595 if (err < 0) {
596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
597 WARN_ON(err == -EMSGSIZE);
598 kfree_skb(skb);
599 goto errout;
600 }
601 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
602 return;
603 errout:
604 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
605 }
606
607 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
608 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
609 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
610 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
611 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
612 };
613
614 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
615 struct nlmsghdr *nlh,
616 struct netlink_ext_ack *extack)
617 {
618 struct net *net = sock_net(in_skb->sk);
619 struct nlattr *tb[NETCONFA_MAX+1];
620 struct netconfmsg *ncm;
621 struct sk_buff *skb;
622 struct ipv6_devconf *devconf;
623 struct inet6_dev *in6_dev;
624 struct net_device *dev;
625 int ifindex;
626 int err;
627
628 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
629 devconf_ipv6_policy, extack);
630 if (err < 0)
631 goto errout;
632
633 err = -EINVAL;
634 if (!tb[NETCONFA_IFINDEX])
635 goto errout;
636
637 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
638 switch (ifindex) {
639 case NETCONFA_IFINDEX_ALL:
640 devconf = net->ipv6.devconf_all;
641 break;
642 case NETCONFA_IFINDEX_DEFAULT:
643 devconf = net->ipv6.devconf_dflt;
644 break;
645 default:
646 dev = __dev_get_by_index(net, ifindex);
647 if (!dev)
648 goto errout;
649 in6_dev = __in6_dev_get(dev);
650 if (!in6_dev)
651 goto errout;
652 devconf = &in6_dev->cnf;
653 break;
654 }
655
656 err = -ENOBUFS;
657 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
658 if (!skb)
659 goto errout;
660
661 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
662 NETLINK_CB(in_skb).portid,
663 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
664 NETCONFA_ALL);
665 if (err < 0) {
666 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
667 WARN_ON(err == -EMSGSIZE);
668 kfree_skb(skb);
669 goto errout;
670 }
671 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
672 errout:
673 return err;
674 }
675
676 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
677 struct netlink_callback *cb)
678 {
679 struct net *net = sock_net(skb->sk);
680 int h, s_h;
681 int idx, s_idx;
682 struct net_device *dev;
683 struct inet6_dev *idev;
684 struct hlist_head *head;
685
686 s_h = cb->args[0];
687 s_idx = idx = cb->args[1];
688
689 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
690 idx = 0;
691 head = &net->dev_index_head[h];
692 rcu_read_lock();
693 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
694 net->dev_base_seq;
695 hlist_for_each_entry_rcu(dev, head, index_hlist) {
696 if (idx < s_idx)
697 goto cont;
698 idev = __in6_dev_get(dev);
699 if (!idev)
700 goto cont;
701
702 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
703 &idev->cnf,
704 NETLINK_CB(cb->skb).portid,
705 cb->nlh->nlmsg_seq,
706 RTM_NEWNETCONF,
707 NLM_F_MULTI,
708 NETCONFA_ALL) < 0) {
709 rcu_read_unlock();
710 goto done;
711 }
712 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
713 cont:
714 idx++;
715 }
716 rcu_read_unlock();
717 }
718 if (h == NETDEV_HASHENTRIES) {
719 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
720 net->ipv6.devconf_all,
721 NETLINK_CB(cb->skb).portid,
722 cb->nlh->nlmsg_seq,
723 RTM_NEWNETCONF, NLM_F_MULTI,
724 NETCONFA_ALL) < 0)
725 goto done;
726 else
727 h++;
728 }
729 if (h == NETDEV_HASHENTRIES + 1) {
730 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
731 net->ipv6.devconf_dflt,
732 NETLINK_CB(cb->skb).portid,
733 cb->nlh->nlmsg_seq,
734 RTM_NEWNETCONF, NLM_F_MULTI,
735 NETCONFA_ALL) < 0)
736 goto done;
737 else
738 h++;
739 }
740 done:
741 cb->args[0] = h;
742 cb->args[1] = idx;
743
744 return skb->len;
745 }
746
747 #ifdef CONFIG_SYSCTL
748 static void dev_forward_change(struct inet6_dev *idev)
749 {
750 struct net_device *dev;
751 struct inet6_ifaddr *ifa;
752
753 if (!idev)
754 return;
755 dev = idev->dev;
756 if (idev->cnf.forwarding)
757 dev_disable_lro(dev);
758 if (dev->flags & IFF_MULTICAST) {
759 if (idev->cnf.forwarding) {
760 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
761 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
762 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
763 } else {
764 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
765 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
766 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
767 }
768 }
769
770 list_for_each_entry(ifa, &idev->addr_list, if_list) {
771 if (ifa->flags&IFA_F_TENTATIVE)
772 continue;
773 if (idev->cnf.forwarding)
774 addrconf_join_anycast(ifa);
775 else
776 addrconf_leave_anycast(ifa);
777 }
778 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
779 NETCONFA_FORWARDING,
780 dev->ifindex, &idev->cnf);
781 }
782
783
784 static void addrconf_forward_change(struct net *net, __s32 newf)
785 {
786 struct net_device *dev;
787 struct inet6_dev *idev;
788
789 for_each_netdev(net, dev) {
790 idev = __in6_dev_get(dev);
791 if (idev) {
792 int changed = (!idev->cnf.forwarding) ^ (!newf);
793 idev->cnf.forwarding = newf;
794 if (changed)
795 dev_forward_change(idev);
796 }
797 }
798 }
799
800 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
801 {
802 struct net *net;
803 int old;
804
805 if (!rtnl_trylock())
806 return restart_syscall();
807
808 net = (struct net *)table->extra2;
809 old = *p;
810 *p = newf;
811
812 if (p == &net->ipv6.devconf_dflt->forwarding) {
813 if ((!newf) ^ (!old))
814 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
815 NETCONFA_FORWARDING,
816 NETCONFA_IFINDEX_DEFAULT,
817 net->ipv6.devconf_dflt);
818 rtnl_unlock();
819 return 0;
820 }
821
822 if (p == &net->ipv6.devconf_all->forwarding) {
823 int old_dflt = net->ipv6.devconf_dflt->forwarding;
824
825 net->ipv6.devconf_dflt->forwarding = newf;
826 if ((!newf) ^ (!old_dflt))
827 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
828 NETCONFA_FORWARDING,
829 NETCONFA_IFINDEX_DEFAULT,
830 net->ipv6.devconf_dflt);
831
832 addrconf_forward_change(net, newf);
833 if ((!newf) ^ (!old))
834 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
835 NETCONFA_FORWARDING,
836 NETCONFA_IFINDEX_ALL,
837 net->ipv6.devconf_all);
838 } else if ((!newf) ^ (!old))
839 dev_forward_change((struct inet6_dev *)table->extra1);
840 rtnl_unlock();
841
842 if (newf)
843 rt6_purge_dflt_routers(net);
844 return 1;
845 }
846
847 static void addrconf_linkdown_change(struct net *net, __s32 newf)
848 {
849 struct net_device *dev;
850 struct inet6_dev *idev;
851
852 for_each_netdev(net, dev) {
853 idev = __in6_dev_get(dev);
854 if (idev) {
855 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
856
857 idev->cnf.ignore_routes_with_linkdown = newf;
858 if (changed)
859 inet6_netconf_notify_devconf(dev_net(dev),
860 RTM_NEWNETCONF,
861 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
862 dev->ifindex,
863 &idev->cnf);
864 }
865 }
866 }
867
868 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
869 {
870 struct net *net;
871 int old;
872
873 if (!rtnl_trylock())
874 return restart_syscall();
875
876 net = (struct net *)table->extra2;
877 old = *p;
878 *p = newf;
879
880 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
881 if ((!newf) ^ (!old))
882 inet6_netconf_notify_devconf(net,
883 RTM_NEWNETCONF,
884 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
885 NETCONFA_IFINDEX_DEFAULT,
886 net->ipv6.devconf_dflt);
887 rtnl_unlock();
888 return 0;
889 }
890
891 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
892 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
893 addrconf_linkdown_change(net, newf);
894 if ((!newf) ^ (!old))
895 inet6_netconf_notify_devconf(net,
896 RTM_NEWNETCONF,
897 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
898 NETCONFA_IFINDEX_ALL,
899 net->ipv6.devconf_all);
900 }
901 rtnl_unlock();
902
903 return 1;
904 }
905
906 #endif
907
908 /* Nobody refers to this ifaddr, destroy it */
909 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
910 {
911 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
912
913 #ifdef NET_REFCNT_DEBUG
914 pr_debug("%s\n", __func__);
915 #endif
916
917 in6_dev_put(ifp->idev);
918
919 if (cancel_delayed_work(&ifp->dad_work))
920 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
921 ifp);
922
923 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
924 pr_warn("Freeing alive inet6 address %p\n", ifp);
925 return;
926 }
927 ip6_rt_put(ifp->rt);
928
929 kfree_rcu(ifp, rcu);
930 }
931
932 static void
933 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
934 {
935 struct list_head *p;
936 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
937
938 /*
939 * Each device address list is sorted in order of scope -
940 * global before linklocal.
941 */
942 list_for_each(p, &idev->addr_list) {
943 struct inet6_ifaddr *ifa
944 = list_entry(p, struct inet6_ifaddr, if_list);
945 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
946 break;
947 }
948
949 list_add_tail(&ifp->if_list, p);
950 }
951
952 static u32 inet6_addr_hash(const struct in6_addr *addr)
953 {
954 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
955 }
956
957 /* On success it returns ifp with increased reference count */
958
959 static struct inet6_ifaddr *
960 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
961 const struct in6_addr *peer_addr, int pfxlen,
962 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
963 {
964 struct net *net = dev_net(idev->dev);
965 struct inet6_ifaddr *ifa = NULL;
966 struct rt6_info *rt;
967 struct in6_validator_info i6vi;
968 unsigned int hash;
969 int err = 0;
970 int addr_type = ipv6_addr_type(addr);
971
972 if (addr_type == IPV6_ADDR_ANY ||
973 addr_type & IPV6_ADDR_MULTICAST ||
974 (!(idev->dev->flags & IFF_LOOPBACK) &&
975 addr_type & IPV6_ADDR_LOOPBACK))
976 return ERR_PTR(-EADDRNOTAVAIL);
977
978 rcu_read_lock_bh();
979
980 in6_dev_hold(idev);
981
982 if (idev->dead) {
983 err = -ENODEV; /*XXX*/
984 goto out2;
985 }
986
987 if (idev->cnf.disable_ipv6) {
988 err = -EACCES;
989 goto out2;
990 }
991
992 i6vi.i6vi_addr = *addr;
993 i6vi.i6vi_dev = idev;
994 rcu_read_unlock_bh();
995
996 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
997
998 rcu_read_lock_bh();
999 err = notifier_to_errno(err);
1000 if (err)
1001 goto out2;
1002
1003 spin_lock(&addrconf_hash_lock);
1004
1005 /* Ignore adding duplicate addresses on an interface */
1006 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1007 ADBG("ipv6_add_addr: already assigned\n");
1008 err = -EEXIST;
1009 goto out;
1010 }
1011
1012 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1013
1014 if (!ifa) {
1015 ADBG("ipv6_add_addr: malloc failed\n");
1016 err = -ENOBUFS;
1017 goto out;
1018 }
1019
1020 rt = addrconf_dst_alloc(idev, addr, false);
1021 if (IS_ERR(rt)) {
1022 err = PTR_ERR(rt);
1023 goto out;
1024 }
1025
1026 if (net->ipv6.devconf_all->disable_policy ||
1027 idev->cnf.disable_policy)
1028 rt->dst.flags |= DST_NOPOLICY;
1029
1030 neigh_parms_data_state_setall(idev->nd_parms);
1031
1032 ifa->addr = *addr;
1033 if (peer_addr)
1034 ifa->peer_addr = *peer_addr;
1035
1036 spin_lock_init(&ifa->lock);
1037 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1038 INIT_HLIST_NODE(&ifa->addr_lst);
1039 ifa->scope = scope;
1040 ifa->prefix_len = pfxlen;
1041 ifa->flags = flags;
1042 /* No need to add the TENTATIVE flag for addresses with NODAD */
1043 if (!(flags & IFA_F_NODAD))
1044 ifa->flags |= IFA_F_TENTATIVE;
1045 ifa->valid_lft = valid_lft;
1046 ifa->prefered_lft = prefered_lft;
1047 ifa->cstamp = ifa->tstamp = jiffies;
1048 ifa->tokenized = false;
1049
1050 ifa->rt = rt;
1051
1052 ifa->idev = idev;
1053 /* For caller */
1054 refcount_set(&ifa->refcnt, 1);
1055
1056 /* Add to big hash table */
1057 hash = inet6_addr_hash(addr);
1058
1059 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1060 spin_unlock(&addrconf_hash_lock);
1061
1062 write_lock(&idev->lock);
1063 /* Add to inet6_dev unicast addr list. */
1064 ipv6_link_dev_addr(idev, ifa);
1065
1066 if (ifa->flags&IFA_F_TEMPORARY) {
1067 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1068 in6_ifa_hold(ifa);
1069 }
1070
1071 in6_ifa_hold(ifa);
1072 write_unlock(&idev->lock);
1073 out2:
1074 rcu_read_unlock_bh();
1075
1076 if (likely(err == 0))
1077 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1078 else {
1079 kfree(ifa);
1080 in6_dev_put(idev);
1081 ifa = ERR_PTR(err);
1082 }
1083
1084 return ifa;
1085 out:
1086 spin_unlock(&addrconf_hash_lock);
1087 goto out2;
1088 }
1089
1090 enum cleanup_prefix_rt_t {
1091 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1092 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1093 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1094 };
1095
1096 /*
1097 * Check, whether the prefix for ifp would still need a prefix route
1098 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1099 * constants.
1100 *
1101 * 1) we don't purge prefix if address was not permanent.
1102 * prefix is managed by its own lifetime.
1103 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1104 * 3) if there are no addresses, delete prefix.
1105 * 4) if there are still other permanent address(es),
1106 * corresponding prefix is still permanent.
1107 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1108 * don't purge the prefix, assume user space is managing it.
1109 * 6) otherwise, update prefix lifetime to the
1110 * longest valid lifetime among the corresponding
1111 * addresses on the device.
1112 * Note: subsequent RA will update lifetime.
1113 **/
1114 static enum cleanup_prefix_rt_t
1115 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1116 {
1117 struct inet6_ifaddr *ifa;
1118 struct inet6_dev *idev = ifp->idev;
1119 unsigned long lifetime;
1120 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1121
1122 *expires = jiffies;
1123
1124 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1125 if (ifa == ifp)
1126 continue;
1127 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1128 ifp->prefix_len))
1129 continue;
1130 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1131 return CLEANUP_PREFIX_RT_NOP;
1132
1133 action = CLEANUP_PREFIX_RT_EXPIRE;
1134
1135 spin_lock(&ifa->lock);
1136
1137 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1138 /*
1139 * Note: Because this address is
1140 * not permanent, lifetime <
1141 * LONG_MAX / HZ here.
1142 */
1143 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1144 *expires = ifa->tstamp + lifetime * HZ;
1145 spin_unlock(&ifa->lock);
1146 }
1147
1148 return action;
1149 }
1150
1151 static void
1152 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1153 {
1154 struct rt6_info *rt;
1155
1156 rt = addrconf_get_prefix_route(&ifp->addr,
1157 ifp->prefix_len,
1158 ifp->idev->dev,
1159 0, RTF_GATEWAY | RTF_DEFAULT);
1160 if (rt) {
1161 if (del_rt)
1162 ip6_del_rt(rt);
1163 else {
1164 if (!(rt->rt6i_flags & RTF_EXPIRES))
1165 rt6_set_expires(rt, expires);
1166 ip6_rt_put(rt);
1167 }
1168 }
1169 }
1170
1171
1172 /* This function wants to get referenced ifp and releases it before return */
1173
1174 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1175 {
1176 int state;
1177 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1178 unsigned long expires;
1179
1180 ASSERT_RTNL();
1181
1182 spin_lock_bh(&ifp->lock);
1183 state = ifp->state;
1184 ifp->state = INET6_IFADDR_STATE_DEAD;
1185 spin_unlock_bh(&ifp->lock);
1186
1187 if (state == INET6_IFADDR_STATE_DEAD)
1188 goto out;
1189
1190 spin_lock_bh(&addrconf_hash_lock);
1191 hlist_del_init_rcu(&ifp->addr_lst);
1192 spin_unlock_bh(&addrconf_hash_lock);
1193
1194 write_lock_bh(&ifp->idev->lock);
1195
1196 if (ifp->flags&IFA_F_TEMPORARY) {
1197 list_del(&ifp->tmp_list);
1198 if (ifp->ifpub) {
1199 in6_ifa_put(ifp->ifpub);
1200 ifp->ifpub = NULL;
1201 }
1202 __in6_ifa_put(ifp);
1203 }
1204
1205 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1206 action = check_cleanup_prefix_route(ifp, &expires);
1207
1208 list_del_init(&ifp->if_list);
1209 __in6_ifa_put(ifp);
1210
1211 write_unlock_bh(&ifp->idev->lock);
1212
1213 addrconf_del_dad_work(ifp);
1214
1215 ipv6_ifa_notify(RTM_DELADDR, ifp);
1216
1217 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1218
1219 if (action != CLEANUP_PREFIX_RT_NOP) {
1220 cleanup_prefix_route(ifp, expires,
1221 action == CLEANUP_PREFIX_RT_DEL);
1222 }
1223
1224 /* clean up prefsrc entries */
1225 rt6_remove_prefsrc(ifp);
1226 out:
1227 in6_ifa_put(ifp);
1228 }
1229
1230 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1231 {
1232 struct inet6_dev *idev = ifp->idev;
1233 struct in6_addr addr, *tmpaddr;
1234 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1235 unsigned long regen_advance;
1236 int tmp_plen;
1237 int ret = 0;
1238 u32 addr_flags;
1239 unsigned long now = jiffies;
1240 long max_desync_factor;
1241 s32 cnf_temp_preferred_lft;
1242
1243 write_lock_bh(&idev->lock);
1244 if (ift) {
1245 spin_lock_bh(&ift->lock);
1246 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1247 spin_unlock_bh(&ift->lock);
1248 tmpaddr = &addr;
1249 } else {
1250 tmpaddr = NULL;
1251 }
1252 retry:
1253 in6_dev_hold(idev);
1254 if (idev->cnf.use_tempaddr <= 0) {
1255 write_unlock_bh(&idev->lock);
1256 pr_info("%s: use_tempaddr is disabled\n", __func__);
1257 in6_dev_put(idev);
1258 ret = -1;
1259 goto out;
1260 }
1261 spin_lock_bh(&ifp->lock);
1262 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1263 idev->cnf.use_tempaddr = -1; /*XXX*/
1264 spin_unlock_bh(&ifp->lock);
1265 write_unlock_bh(&idev->lock);
1266 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1267 __func__);
1268 in6_dev_put(idev);
1269 ret = -1;
1270 goto out;
1271 }
1272 in6_ifa_hold(ifp);
1273 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1274 ipv6_try_regen_rndid(idev, tmpaddr);
1275 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1276 age = (now - ifp->tstamp) / HZ;
1277
1278 regen_advance = idev->cnf.regen_max_retry *
1279 idev->cnf.dad_transmits *
1280 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1281
1282 /* recalculate max_desync_factor each time and update
1283 * idev->desync_factor if it's larger
1284 */
1285 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1286 max_desync_factor = min_t(__u32,
1287 idev->cnf.max_desync_factor,
1288 cnf_temp_preferred_lft - regen_advance);
1289
1290 if (unlikely(idev->desync_factor > max_desync_factor)) {
1291 if (max_desync_factor > 0) {
1292 get_random_bytes(&idev->desync_factor,
1293 sizeof(idev->desync_factor));
1294 idev->desync_factor %= max_desync_factor;
1295 } else {
1296 idev->desync_factor = 0;
1297 }
1298 }
1299
1300 tmp_valid_lft = min_t(__u32,
1301 ifp->valid_lft,
1302 idev->cnf.temp_valid_lft + age);
1303 tmp_prefered_lft = cnf_temp_preferred_lft + age -
1304 idev->desync_factor;
1305 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1306 tmp_plen = ifp->prefix_len;
1307 tmp_tstamp = ifp->tstamp;
1308 spin_unlock_bh(&ifp->lock);
1309
1310 write_unlock_bh(&idev->lock);
1311
1312 /* A temporary address is created only if this calculated Preferred
1313 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1314 * an implementation must not create a temporary address with a zero
1315 * Preferred Lifetime.
1316 * Use age calculation as in addrconf_verify to avoid unnecessary
1317 * temporary addresses being generated.
1318 */
1319 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1320 if (tmp_prefered_lft <= regen_advance + age) {
1321 in6_ifa_put(ifp);
1322 in6_dev_put(idev);
1323 ret = -1;
1324 goto out;
1325 }
1326
1327 addr_flags = IFA_F_TEMPORARY;
1328 /* set in addrconf_prefix_rcv() */
1329 if (ifp->flags & IFA_F_OPTIMISTIC)
1330 addr_flags |= IFA_F_OPTIMISTIC;
1331
1332 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1333 ipv6_addr_scope(&addr), addr_flags,
1334 tmp_valid_lft, tmp_prefered_lft);
1335 if (IS_ERR(ift)) {
1336 in6_ifa_put(ifp);
1337 in6_dev_put(idev);
1338 pr_info("%s: retry temporary address regeneration\n", __func__);
1339 tmpaddr = &addr;
1340 write_lock_bh(&idev->lock);
1341 goto retry;
1342 }
1343
1344 spin_lock_bh(&ift->lock);
1345 ift->ifpub = ifp;
1346 ift->cstamp = now;
1347 ift->tstamp = tmp_tstamp;
1348 spin_unlock_bh(&ift->lock);
1349
1350 addrconf_dad_start(ift);
1351 in6_ifa_put(ift);
1352 in6_dev_put(idev);
1353 out:
1354 return ret;
1355 }
1356
1357 /*
1358 * Choose an appropriate source address (RFC3484)
1359 */
1360 enum {
1361 IPV6_SADDR_RULE_INIT = 0,
1362 IPV6_SADDR_RULE_LOCAL,
1363 IPV6_SADDR_RULE_SCOPE,
1364 IPV6_SADDR_RULE_PREFERRED,
1365 #ifdef CONFIG_IPV6_MIP6
1366 IPV6_SADDR_RULE_HOA,
1367 #endif
1368 IPV6_SADDR_RULE_OIF,
1369 IPV6_SADDR_RULE_LABEL,
1370 IPV6_SADDR_RULE_PRIVACY,
1371 IPV6_SADDR_RULE_ORCHID,
1372 IPV6_SADDR_RULE_PREFIX,
1373 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1374 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1375 #endif
1376 IPV6_SADDR_RULE_MAX
1377 };
1378
1379 struct ipv6_saddr_score {
1380 int rule;
1381 int addr_type;
1382 struct inet6_ifaddr *ifa;
1383 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1384 int scopedist;
1385 int matchlen;
1386 };
1387
1388 struct ipv6_saddr_dst {
1389 const struct in6_addr *addr;
1390 int ifindex;
1391 int scope;
1392 int label;
1393 unsigned int prefs;
1394 };
1395
1396 static inline int ipv6_saddr_preferred(int type)
1397 {
1398 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1399 return 1;
1400 return 0;
1401 }
1402
1403 static bool ipv6_use_optimistic_addr(struct net *net,
1404 struct inet6_dev *idev)
1405 {
1406 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1407 if (!idev)
1408 return false;
1409 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1410 return false;
1411 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1412 return false;
1413
1414 return true;
1415 #else
1416 return false;
1417 #endif
1418 }
1419
1420 static int ipv6_get_saddr_eval(struct net *net,
1421 struct ipv6_saddr_score *score,
1422 struct ipv6_saddr_dst *dst,
1423 int i)
1424 {
1425 int ret;
1426
1427 if (i <= score->rule) {
1428 switch (i) {
1429 case IPV6_SADDR_RULE_SCOPE:
1430 ret = score->scopedist;
1431 break;
1432 case IPV6_SADDR_RULE_PREFIX:
1433 ret = score->matchlen;
1434 break;
1435 default:
1436 ret = !!test_bit(i, score->scorebits);
1437 }
1438 goto out;
1439 }
1440
1441 switch (i) {
1442 case IPV6_SADDR_RULE_INIT:
1443 /* Rule 0: remember if hiscore is not ready yet */
1444 ret = !!score->ifa;
1445 break;
1446 case IPV6_SADDR_RULE_LOCAL:
1447 /* Rule 1: Prefer same address */
1448 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1449 break;
1450 case IPV6_SADDR_RULE_SCOPE:
1451 /* Rule 2: Prefer appropriate scope
1452 *
1453 * ret
1454 * ^
1455 * -1 | d 15
1456 * ---+--+-+---> scope
1457 * |
1458 * | d is scope of the destination.
1459 * B-d | \
1460 * | \ <- smaller scope is better if
1461 * B-15 | \ if scope is enough for destination.
1462 * | ret = B - scope (-1 <= scope >= d <= 15).
1463 * d-C-1 | /
1464 * |/ <- greater is better
1465 * -C / if scope is not enough for destination.
1466 * /| ret = scope - C (-1 <= d < scope <= 15).
1467 *
1468 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1469 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1470 * Assume B = 0 and we get C > 29.
1471 */
1472 ret = __ipv6_addr_src_scope(score->addr_type);
1473 if (ret >= dst->scope)
1474 ret = -ret;
1475 else
1476 ret -= 128; /* 30 is enough */
1477 score->scopedist = ret;
1478 break;
1479 case IPV6_SADDR_RULE_PREFERRED:
1480 {
1481 /* Rule 3: Avoid deprecated and optimistic addresses */
1482 u8 avoid = IFA_F_DEPRECATED;
1483
1484 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1485 avoid |= IFA_F_OPTIMISTIC;
1486 ret = ipv6_saddr_preferred(score->addr_type) ||
1487 !(score->ifa->flags & avoid);
1488 break;
1489 }
1490 #ifdef CONFIG_IPV6_MIP6
1491 case IPV6_SADDR_RULE_HOA:
1492 {
1493 /* Rule 4: Prefer home address */
1494 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1495 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1496 break;
1497 }
1498 #endif
1499 case IPV6_SADDR_RULE_OIF:
1500 /* Rule 5: Prefer outgoing interface */
1501 ret = (!dst->ifindex ||
1502 dst->ifindex == score->ifa->idev->dev->ifindex);
1503 break;
1504 case IPV6_SADDR_RULE_LABEL:
1505 /* Rule 6: Prefer matching label */
1506 ret = ipv6_addr_label(net,
1507 &score->ifa->addr, score->addr_type,
1508 score->ifa->idev->dev->ifindex) == dst->label;
1509 break;
1510 case IPV6_SADDR_RULE_PRIVACY:
1511 {
1512 /* Rule 7: Prefer public address
1513 * Note: prefer temporary address if use_tempaddr >= 2
1514 */
1515 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1516 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1517 score->ifa->idev->cnf.use_tempaddr >= 2;
1518 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1519 break;
1520 }
1521 case IPV6_SADDR_RULE_ORCHID:
1522 /* Rule 8-: Prefer ORCHID vs ORCHID or
1523 * non-ORCHID vs non-ORCHID
1524 */
1525 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1526 ipv6_addr_orchid(dst->addr));
1527 break;
1528 case IPV6_SADDR_RULE_PREFIX:
1529 /* Rule 8: Use longest matching prefix */
1530 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1531 if (ret > score->ifa->prefix_len)
1532 ret = score->ifa->prefix_len;
1533 score->matchlen = ret;
1534 break;
1535 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1536 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1537 /* Optimistic addresses still have lower precedence than other
1538 * preferred addresses.
1539 */
1540 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1541 break;
1542 #endif
1543 default:
1544 ret = 0;
1545 }
1546
1547 if (ret)
1548 __set_bit(i, score->scorebits);
1549 score->rule = i;
1550 out:
1551 return ret;
1552 }
1553
1554 static int __ipv6_dev_get_saddr(struct net *net,
1555 struct ipv6_saddr_dst *dst,
1556 struct inet6_dev *idev,
1557 struct ipv6_saddr_score *scores,
1558 int hiscore_idx)
1559 {
1560 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1561
1562 read_lock_bh(&idev->lock);
1563 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1564 int i;
1565
1566 /*
1567 * - Tentative Address (RFC2462 section 5.4)
1568 * - A tentative address is not considered
1569 * "assigned to an interface" in the traditional
1570 * sense, unless it is also flagged as optimistic.
1571 * - Candidate Source Address (section 4)
1572 * - In any case, anycast addresses, multicast
1573 * addresses, and the unspecified address MUST
1574 * NOT be included in a candidate set.
1575 */
1576 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1577 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1578 continue;
1579
1580 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1581
1582 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1583 score->addr_type & IPV6_ADDR_MULTICAST)) {
1584 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1585 idev->dev->name);
1586 continue;
1587 }
1588
1589 score->rule = -1;
1590 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1591
1592 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1593 int minihiscore, miniscore;
1594
1595 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1596 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1597
1598 if (minihiscore > miniscore) {
1599 if (i == IPV6_SADDR_RULE_SCOPE &&
1600 score->scopedist > 0) {
1601 /*
1602 * special case:
1603 * each remaining entry
1604 * has too small (not enough)
1605 * scope, because ifa entries
1606 * are sorted by their scope
1607 * values.
1608 */
1609 goto out;
1610 }
1611 break;
1612 } else if (minihiscore < miniscore) {
1613 if (hiscore->ifa)
1614 in6_ifa_put(hiscore->ifa);
1615
1616 in6_ifa_hold(score->ifa);
1617
1618 swap(hiscore, score);
1619 hiscore_idx = 1 - hiscore_idx;
1620
1621 /* restore our iterator */
1622 score->ifa = hiscore->ifa;
1623
1624 break;
1625 }
1626 }
1627 }
1628 out:
1629 read_unlock_bh(&idev->lock);
1630 return hiscore_idx;
1631 }
1632
1633 static int ipv6_get_saddr_master(struct net *net,
1634 const struct net_device *dst_dev,
1635 const struct net_device *master,
1636 struct ipv6_saddr_dst *dst,
1637 struct ipv6_saddr_score *scores,
1638 int hiscore_idx)
1639 {
1640 struct inet6_dev *idev;
1641
1642 idev = __in6_dev_get(dst_dev);
1643 if (idev)
1644 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1645 scores, hiscore_idx);
1646
1647 idev = __in6_dev_get(master);
1648 if (idev)
1649 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1650 scores, hiscore_idx);
1651
1652 return hiscore_idx;
1653 }
1654
1655 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1656 const struct in6_addr *daddr, unsigned int prefs,
1657 struct in6_addr *saddr)
1658 {
1659 struct ipv6_saddr_score scores[2], *hiscore;
1660 struct ipv6_saddr_dst dst;
1661 struct inet6_dev *idev;
1662 struct net_device *dev;
1663 int dst_type;
1664 bool use_oif_addr = false;
1665 int hiscore_idx = 0;
1666
1667 dst_type = __ipv6_addr_type(daddr);
1668 dst.addr = daddr;
1669 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1670 dst.scope = __ipv6_addr_src_scope(dst_type);
1671 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1672 dst.prefs = prefs;
1673
1674 scores[hiscore_idx].rule = -1;
1675 scores[hiscore_idx].ifa = NULL;
1676
1677 rcu_read_lock();
1678
1679 /* Candidate Source Address (section 4)
1680 * - multicast and link-local destination address,
1681 * the set of candidate source address MUST only
1682 * include addresses assigned to interfaces
1683 * belonging to the same link as the outgoing
1684 * interface.
1685 * (- For site-local destination addresses, the
1686 * set of candidate source addresses MUST only
1687 * include addresses assigned to interfaces
1688 * belonging to the same site as the outgoing
1689 * interface.)
1690 * - "It is RECOMMENDED that the candidate source addresses
1691 * be the set of unicast addresses assigned to the
1692 * interface that will be used to send to the destination
1693 * (the 'outgoing' interface)." (RFC 6724)
1694 */
1695 if (dst_dev) {
1696 idev = __in6_dev_get(dst_dev);
1697 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1698 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1699 (idev && idev->cnf.use_oif_addrs_only)) {
1700 use_oif_addr = true;
1701 }
1702 }
1703
1704 if (use_oif_addr) {
1705 if (idev)
1706 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1707 } else {
1708 const struct net_device *master;
1709 int master_idx = 0;
1710
1711 /* if dst_dev exists and is enslaved to an L3 device, then
1712 * prefer addresses from dst_dev and then the master over
1713 * any other enslaved devices in the L3 domain.
1714 */
1715 master = l3mdev_master_dev_rcu(dst_dev);
1716 if (master) {
1717 master_idx = master->ifindex;
1718
1719 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1720 master, &dst,
1721 scores, hiscore_idx);
1722
1723 if (scores[hiscore_idx].ifa)
1724 goto out;
1725 }
1726
1727 for_each_netdev_rcu(net, dev) {
1728 /* only consider addresses on devices in the
1729 * same L3 domain
1730 */
1731 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1732 continue;
1733 idev = __in6_dev_get(dev);
1734 if (!idev)
1735 continue;
1736 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1737 }
1738 }
1739
1740 out:
1741 rcu_read_unlock();
1742
1743 hiscore = &scores[hiscore_idx];
1744 if (!hiscore->ifa)
1745 return -EADDRNOTAVAIL;
1746
1747 *saddr = hiscore->ifa->addr;
1748 in6_ifa_put(hiscore->ifa);
1749 return 0;
1750 }
1751 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1752
1753 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1754 u32 banned_flags)
1755 {
1756 struct inet6_ifaddr *ifp;
1757 int err = -EADDRNOTAVAIL;
1758
1759 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1760 if (ifp->scope > IFA_LINK)
1761 break;
1762 if (ifp->scope == IFA_LINK &&
1763 !(ifp->flags & banned_flags)) {
1764 *addr = ifp->addr;
1765 err = 0;
1766 break;
1767 }
1768 }
1769 return err;
1770 }
1771
1772 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1773 u32 banned_flags)
1774 {
1775 struct inet6_dev *idev;
1776 int err = -EADDRNOTAVAIL;
1777
1778 rcu_read_lock();
1779 idev = __in6_dev_get(dev);
1780 if (idev) {
1781 read_lock_bh(&idev->lock);
1782 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1783 read_unlock_bh(&idev->lock);
1784 }
1785 rcu_read_unlock();
1786 return err;
1787 }
1788
1789 static int ipv6_count_addresses(struct inet6_dev *idev)
1790 {
1791 int cnt = 0;
1792 struct inet6_ifaddr *ifp;
1793
1794 read_lock_bh(&idev->lock);
1795 list_for_each_entry(ifp, &idev->addr_list, if_list)
1796 cnt++;
1797 read_unlock_bh(&idev->lock);
1798 return cnt;
1799 }
1800
1801 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1802 const struct net_device *dev, int strict)
1803 {
1804 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1805 }
1806 EXPORT_SYMBOL(ipv6_chk_addr);
1807
1808 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1809 const struct net_device *dev, int strict,
1810 u32 banned_flags)
1811 {
1812 struct inet6_ifaddr *ifp;
1813 unsigned int hash = inet6_addr_hash(addr);
1814 u32 ifp_flags;
1815
1816 rcu_read_lock_bh();
1817 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1818 if (!net_eq(dev_net(ifp->idev->dev), net))
1819 continue;
1820 /* Decouple optimistic from tentative for evaluation here.
1821 * Ban optimistic addresses explicitly, when required.
1822 */
1823 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1824 ? (ifp->flags&~IFA_F_TENTATIVE)
1825 : ifp->flags;
1826 if (ipv6_addr_equal(&ifp->addr, addr) &&
1827 !(ifp_flags&banned_flags) &&
1828 (!dev || ifp->idev->dev == dev ||
1829 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1830 rcu_read_unlock_bh();
1831 return 1;
1832 }
1833 }
1834
1835 rcu_read_unlock_bh();
1836 return 0;
1837 }
1838 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1839
1840 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1841 struct net_device *dev)
1842 {
1843 unsigned int hash = inet6_addr_hash(addr);
1844 struct inet6_ifaddr *ifp;
1845
1846 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1847 if (!net_eq(dev_net(ifp->idev->dev), net))
1848 continue;
1849 if (ipv6_addr_equal(&ifp->addr, addr)) {
1850 if (!dev || ifp->idev->dev == dev)
1851 return true;
1852 }
1853 }
1854 return false;
1855 }
1856
1857 /* Compares an address/prefix_len with addresses on device @dev.
1858 * If one is found it returns true.
1859 */
1860 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1861 const unsigned int prefix_len, struct net_device *dev)
1862 {
1863 struct inet6_dev *idev;
1864 struct inet6_ifaddr *ifa;
1865 bool ret = false;
1866
1867 rcu_read_lock();
1868 idev = __in6_dev_get(dev);
1869 if (idev) {
1870 read_lock_bh(&idev->lock);
1871 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1872 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1873 if (ret)
1874 break;
1875 }
1876 read_unlock_bh(&idev->lock);
1877 }
1878 rcu_read_unlock();
1879
1880 return ret;
1881 }
1882 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1883
1884 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1885 {
1886 struct inet6_dev *idev;
1887 struct inet6_ifaddr *ifa;
1888 int onlink;
1889
1890 onlink = 0;
1891 rcu_read_lock();
1892 idev = __in6_dev_get(dev);
1893 if (idev) {
1894 read_lock_bh(&idev->lock);
1895 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1896 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1897 ifa->prefix_len);
1898 if (onlink)
1899 break;
1900 }
1901 read_unlock_bh(&idev->lock);
1902 }
1903 rcu_read_unlock();
1904 return onlink;
1905 }
1906 EXPORT_SYMBOL(ipv6_chk_prefix);
1907
1908 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1909 struct net_device *dev, int strict)
1910 {
1911 struct inet6_ifaddr *ifp, *result = NULL;
1912 unsigned int hash = inet6_addr_hash(addr);
1913
1914 rcu_read_lock_bh();
1915 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1916 if (!net_eq(dev_net(ifp->idev->dev), net))
1917 continue;
1918 if (ipv6_addr_equal(&ifp->addr, addr)) {
1919 if (!dev || ifp->idev->dev == dev ||
1920 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1921 result = ifp;
1922 in6_ifa_hold(ifp);
1923 break;
1924 }
1925 }
1926 }
1927 rcu_read_unlock_bh();
1928
1929 return result;
1930 }
1931
1932 /* Gets referenced address, destroys ifaddr */
1933
1934 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1935 {
1936 if (dad_failed)
1937 ifp->flags |= IFA_F_DADFAILED;
1938
1939 if (ifp->flags&IFA_F_TEMPORARY) {
1940 struct inet6_ifaddr *ifpub;
1941 spin_lock_bh(&ifp->lock);
1942 ifpub = ifp->ifpub;
1943 if (ifpub) {
1944 in6_ifa_hold(ifpub);
1945 spin_unlock_bh(&ifp->lock);
1946 ipv6_create_tempaddr(ifpub, ifp);
1947 in6_ifa_put(ifpub);
1948 } else {
1949 spin_unlock_bh(&ifp->lock);
1950 }
1951 ipv6_del_addr(ifp);
1952 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1953 spin_lock_bh(&ifp->lock);
1954 addrconf_del_dad_work(ifp);
1955 ifp->flags |= IFA_F_TENTATIVE;
1956 spin_unlock_bh(&ifp->lock);
1957 if (dad_failed)
1958 ipv6_ifa_notify(0, ifp);
1959 in6_ifa_put(ifp);
1960 } else {
1961 ipv6_del_addr(ifp);
1962 }
1963 }
1964
1965 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1966 {
1967 int err = -ENOENT;
1968
1969 spin_lock_bh(&ifp->lock);
1970 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1971 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1972 err = 0;
1973 }
1974 spin_unlock_bh(&ifp->lock);
1975
1976 return err;
1977 }
1978
1979 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1980 {
1981 struct inet6_dev *idev = ifp->idev;
1982 struct net *net = dev_net(ifp->idev->dev);
1983
1984 if (addrconf_dad_end(ifp)) {
1985 in6_ifa_put(ifp);
1986 return;
1987 }
1988
1989 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1990 ifp->idev->dev->name, &ifp->addr);
1991
1992 spin_lock_bh(&ifp->lock);
1993
1994 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1995 int scope = ifp->scope;
1996 u32 flags = ifp->flags;
1997 struct in6_addr new_addr;
1998 struct inet6_ifaddr *ifp2;
1999 u32 valid_lft, preferred_lft;
2000 int pfxlen = ifp->prefix_len;
2001 int retries = ifp->stable_privacy_retry + 1;
2002
2003 if (retries > net->ipv6.sysctl.idgen_retries) {
2004 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2005 ifp->idev->dev->name);
2006 goto errdad;
2007 }
2008
2009 new_addr = ifp->addr;
2010 if (ipv6_generate_stable_address(&new_addr, retries,
2011 idev))
2012 goto errdad;
2013
2014 valid_lft = ifp->valid_lft;
2015 preferred_lft = ifp->prefered_lft;
2016
2017 spin_unlock_bh(&ifp->lock);
2018
2019 if (idev->cnf.max_addresses &&
2020 ipv6_count_addresses(idev) >=
2021 idev->cnf.max_addresses)
2022 goto lock_errdad;
2023
2024 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2025 ifp->idev->dev->name);
2026
2027 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2028 scope, flags, valid_lft,
2029 preferred_lft);
2030 if (IS_ERR(ifp2))
2031 goto lock_errdad;
2032
2033 spin_lock_bh(&ifp2->lock);
2034 ifp2->stable_privacy_retry = retries;
2035 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2036 spin_unlock_bh(&ifp2->lock);
2037
2038 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2039 in6_ifa_put(ifp2);
2040 lock_errdad:
2041 spin_lock_bh(&ifp->lock);
2042 }
2043
2044 errdad:
2045 /* transition from _POSTDAD to _ERRDAD */
2046 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2047 spin_unlock_bh(&ifp->lock);
2048
2049 addrconf_mod_dad_work(ifp, 0);
2050 in6_ifa_put(ifp);
2051 }
2052
2053 /* Join to solicited addr multicast group.
2054 * caller must hold RTNL */
2055 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2056 {
2057 struct in6_addr maddr;
2058
2059 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2060 return;
2061
2062 addrconf_addr_solict_mult(addr, &maddr);
2063 ipv6_dev_mc_inc(dev, &maddr);
2064 }
2065
2066 /* caller must hold RTNL */
2067 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2068 {
2069 struct in6_addr maddr;
2070
2071 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2072 return;
2073
2074 addrconf_addr_solict_mult(addr, &maddr);
2075 __ipv6_dev_mc_dec(idev, &maddr);
2076 }
2077
2078 /* caller must hold RTNL */
2079 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2080 {
2081 struct in6_addr addr;
2082
2083 if (ifp->prefix_len >= 127) /* RFC 6164 */
2084 return;
2085 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2086 if (ipv6_addr_any(&addr))
2087 return;
2088 __ipv6_dev_ac_inc(ifp->idev, &addr);
2089 }
2090
2091 /* caller must hold RTNL */
2092 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2093 {
2094 struct in6_addr addr;
2095
2096 if (ifp->prefix_len >= 127) /* RFC 6164 */
2097 return;
2098 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2099 if (ipv6_addr_any(&addr))
2100 return;
2101 __ipv6_dev_ac_dec(ifp->idev, &addr);
2102 }
2103
2104 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2105 {
2106 switch (dev->addr_len) {
2107 case ETH_ALEN:
2108 memcpy(eui, dev->dev_addr, 3);
2109 eui[3] = 0xFF;
2110 eui[4] = 0xFE;
2111 memcpy(eui + 5, dev->dev_addr + 3, 3);
2112 break;
2113 case EUI64_ADDR_LEN:
2114 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2115 eui[0] ^= 2;
2116 break;
2117 default:
2118 return -1;
2119 }
2120
2121 return 0;
2122 }
2123
2124 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2125 {
2126 union fwnet_hwaddr *ha;
2127
2128 if (dev->addr_len != FWNET_ALEN)
2129 return -1;
2130
2131 ha = (union fwnet_hwaddr *)dev->dev_addr;
2132
2133 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2134 eui[0] ^= 2;
2135 return 0;
2136 }
2137
2138 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2139 {
2140 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2141 if (dev->addr_len != ARCNET_ALEN)
2142 return -1;
2143 memset(eui, 0, 7);
2144 eui[7] = *(u8 *)dev->dev_addr;
2145 return 0;
2146 }
2147
2148 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2149 {
2150 if (dev->addr_len != INFINIBAND_ALEN)
2151 return -1;
2152 memcpy(eui, dev->dev_addr + 12, 8);
2153 eui[0] |= 2;
2154 return 0;
2155 }
2156
2157 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2158 {
2159 if (addr == 0)
2160 return -1;
2161 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2162 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2163 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2164 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2165 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2166 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2167 eui[1] = 0;
2168 eui[2] = 0x5E;
2169 eui[3] = 0xFE;
2170 memcpy(eui + 4, &addr, 4);
2171 return 0;
2172 }
2173
2174 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2175 {
2176 if (dev->priv_flags & IFF_ISATAP)
2177 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2178 return -1;
2179 }
2180
2181 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2182 {
2183 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2184 }
2185
2186 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2187 {
2188 memcpy(eui, dev->perm_addr, 3);
2189 memcpy(eui + 5, dev->perm_addr + 3, 3);
2190 eui[3] = 0xFF;
2191 eui[4] = 0xFE;
2192 eui[0] ^= 2;
2193 return 0;
2194 }
2195
2196 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2197 {
2198 switch (dev->type) {
2199 case ARPHRD_ETHER:
2200 case ARPHRD_FDDI:
2201 return addrconf_ifid_eui48(eui, dev);
2202 case ARPHRD_ARCNET:
2203 return addrconf_ifid_arcnet(eui, dev);
2204 case ARPHRD_INFINIBAND:
2205 return addrconf_ifid_infiniband(eui, dev);
2206 case ARPHRD_SIT:
2207 return addrconf_ifid_sit(eui, dev);
2208 case ARPHRD_IPGRE:
2209 case ARPHRD_TUNNEL:
2210 return addrconf_ifid_gre(eui, dev);
2211 case ARPHRD_6LOWPAN:
2212 return addrconf_ifid_6lowpan(eui, dev);
2213 case ARPHRD_IEEE1394:
2214 return addrconf_ifid_ieee1394(eui, dev);
2215 case ARPHRD_TUNNEL6:
2216 case ARPHRD_IP6GRE:
2217 return addrconf_ifid_ip6tnl(eui, dev);
2218 }
2219 return -1;
2220 }
2221
2222 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2223 {
2224 int err = -1;
2225 struct inet6_ifaddr *ifp;
2226
2227 read_lock_bh(&idev->lock);
2228 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2229 if (ifp->scope > IFA_LINK)
2230 break;
2231 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2232 memcpy(eui, ifp->addr.s6_addr+8, 8);
2233 err = 0;
2234 break;
2235 }
2236 }
2237 read_unlock_bh(&idev->lock);
2238 return err;
2239 }
2240
2241 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2242 static void ipv6_regen_rndid(struct inet6_dev *idev)
2243 {
2244 regen:
2245 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2246 idev->rndid[0] &= ~0x02;
2247
2248 /*
2249 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2250 * check if generated address is not inappropriate
2251 *
2252 * - Reserved subnet anycast (RFC 2526)
2253 * 11111101 11....11 1xxxxxxx
2254 * - ISATAP (RFC4214) 6.1
2255 * 00-00-5E-FE-xx-xx-xx-xx
2256 * - value 0
2257 * - XXX: already assigned to an address on the device
2258 */
2259 if (idev->rndid[0] == 0xfd &&
2260 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2261 (idev->rndid[7]&0x80))
2262 goto regen;
2263 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2264 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2265 goto regen;
2266 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2267 goto regen;
2268 }
2269 }
2270
2271 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2272 {
2273 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2274 ipv6_regen_rndid(idev);
2275 }
2276
2277 /*
2278 * Add prefix route.
2279 */
2280
2281 static void
2282 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2283 unsigned long expires, u32 flags)
2284 {
2285 struct fib6_config cfg = {
2286 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2287 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2288 .fc_ifindex = dev->ifindex,
2289 .fc_expires = expires,
2290 .fc_dst_len = plen,
2291 .fc_flags = RTF_UP | flags,
2292 .fc_nlinfo.nl_net = dev_net(dev),
2293 .fc_protocol = RTPROT_KERNEL,
2294 };
2295
2296 cfg.fc_dst = *pfx;
2297
2298 /* Prevent useless cloning on PtP SIT.
2299 This thing is done here expecting that the whole
2300 class of non-broadcast devices need not cloning.
2301 */
2302 #if IS_ENABLED(CONFIG_IPV6_SIT)
2303 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2304 cfg.fc_flags |= RTF_NONEXTHOP;
2305 #endif
2306
2307 ip6_route_add(&cfg, NULL);
2308 }
2309
2310
2311 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2312 int plen,
2313 const struct net_device *dev,
2314 u32 flags, u32 noflags)
2315 {
2316 struct fib6_node *fn;
2317 struct rt6_info *rt = NULL;
2318 struct fib6_table *table;
2319 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2320
2321 table = fib6_get_table(dev_net(dev), tb_id);
2322 if (!table)
2323 return NULL;
2324
2325 read_lock_bh(&table->tb6_lock);
2326 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2327 if (!fn)
2328 goto out;
2329
2330 noflags |= RTF_CACHE;
2331 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2332 if (rt->dst.dev->ifindex != dev->ifindex)
2333 continue;
2334 if ((rt->rt6i_flags & flags) != flags)
2335 continue;
2336 if ((rt->rt6i_flags & noflags) != 0)
2337 continue;
2338 dst_hold(&rt->dst);
2339 break;
2340 }
2341 out:
2342 read_unlock_bh(&table->tb6_lock);
2343 return rt;
2344 }
2345
2346
2347 /* Create "default" multicast route to the interface */
2348
2349 static void addrconf_add_mroute(struct net_device *dev)
2350 {
2351 struct fib6_config cfg = {
2352 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2353 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2354 .fc_ifindex = dev->ifindex,
2355 .fc_dst_len = 8,
2356 .fc_flags = RTF_UP,
2357 .fc_nlinfo.nl_net = dev_net(dev),
2358 };
2359
2360 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2361
2362 ip6_route_add(&cfg, NULL);
2363 }
2364
2365 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2366 {
2367 struct inet6_dev *idev;
2368
2369 ASSERT_RTNL();
2370
2371 idev = ipv6_find_idev(dev);
2372 if (!idev)
2373 return ERR_PTR(-ENOBUFS);
2374
2375 if (idev->cnf.disable_ipv6)
2376 return ERR_PTR(-EACCES);
2377
2378 /* Add default multicast route */
2379 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2380 addrconf_add_mroute(dev);
2381
2382 return idev;
2383 }
2384
2385 static void manage_tempaddrs(struct inet6_dev *idev,
2386 struct inet6_ifaddr *ifp,
2387 __u32 valid_lft, __u32 prefered_lft,
2388 bool create, unsigned long now)
2389 {
2390 u32 flags;
2391 struct inet6_ifaddr *ift;
2392
2393 read_lock_bh(&idev->lock);
2394 /* update all temporary addresses in the list */
2395 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2396 int age, max_valid, max_prefered;
2397
2398 if (ifp != ift->ifpub)
2399 continue;
2400
2401 /* RFC 4941 section 3.3:
2402 * If a received option will extend the lifetime of a public
2403 * address, the lifetimes of temporary addresses should
2404 * be extended, subject to the overall constraint that no
2405 * temporary addresses should ever remain "valid" or "preferred"
2406 * for a time longer than (TEMP_VALID_LIFETIME) or
2407 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2408 */
2409 age = (now - ift->cstamp) / HZ;
2410 max_valid = idev->cnf.temp_valid_lft - age;
2411 if (max_valid < 0)
2412 max_valid = 0;
2413
2414 max_prefered = idev->cnf.temp_prefered_lft -
2415 idev->desync_factor - age;
2416 if (max_prefered < 0)
2417 max_prefered = 0;
2418
2419 if (valid_lft > max_valid)
2420 valid_lft = max_valid;
2421
2422 if (prefered_lft > max_prefered)
2423 prefered_lft = max_prefered;
2424
2425 spin_lock(&ift->lock);
2426 flags = ift->flags;
2427 ift->valid_lft = valid_lft;
2428 ift->prefered_lft = prefered_lft;
2429 ift->tstamp = now;
2430 if (prefered_lft > 0)
2431 ift->flags &= ~IFA_F_DEPRECATED;
2432
2433 spin_unlock(&ift->lock);
2434 if (!(flags&IFA_F_TENTATIVE))
2435 ipv6_ifa_notify(0, ift);
2436 }
2437
2438 if ((create || list_empty(&idev->tempaddr_list)) &&
2439 idev->cnf.use_tempaddr > 0) {
2440 /* When a new public address is created as described
2441 * in [ADDRCONF], also create a new temporary address.
2442 * Also create a temporary address if it's enabled but
2443 * no temporary address currently exists.
2444 */
2445 read_unlock_bh(&idev->lock);
2446 ipv6_create_tempaddr(ifp, NULL);
2447 } else {
2448 read_unlock_bh(&idev->lock);
2449 }
2450 }
2451
2452 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2453 {
2454 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2455 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2456 }
2457
2458 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2459 const struct prefix_info *pinfo,
2460 struct inet6_dev *in6_dev,
2461 const struct in6_addr *addr, int addr_type,
2462 u32 addr_flags, bool sllao, bool tokenized,
2463 __u32 valid_lft, u32 prefered_lft)
2464 {
2465 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2466 int create = 0, update_lft = 0;
2467
2468 if (!ifp && valid_lft) {
2469 int max_addresses = in6_dev->cnf.max_addresses;
2470
2471 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2472 if ((net->ipv6.devconf_all->optimistic_dad ||
2473 in6_dev->cnf.optimistic_dad) &&
2474 !net->ipv6.devconf_all->forwarding && sllao)
2475 addr_flags |= IFA_F_OPTIMISTIC;
2476 #endif
2477
2478 /* Do not allow to create too much of autoconfigured
2479 * addresses; this would be too easy way to crash kernel.
2480 */
2481 if (!max_addresses ||
2482 ipv6_count_addresses(in6_dev) < max_addresses)
2483 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2484 pinfo->prefix_len,
2485 addr_type&IPV6_ADDR_SCOPE_MASK,
2486 addr_flags, valid_lft,
2487 prefered_lft);
2488
2489 if (IS_ERR_OR_NULL(ifp))
2490 return -1;
2491
2492 update_lft = 0;
2493 create = 1;
2494 spin_lock_bh(&ifp->lock);
2495 ifp->flags |= IFA_F_MANAGETEMPADDR;
2496 ifp->cstamp = jiffies;
2497 ifp->tokenized = tokenized;
2498 spin_unlock_bh(&ifp->lock);
2499 addrconf_dad_start(ifp);
2500 }
2501
2502 if (ifp) {
2503 u32 flags;
2504 unsigned long now;
2505 u32 stored_lft;
2506
2507 /* update lifetime (RFC2462 5.5.3 e) */
2508 spin_lock_bh(&ifp->lock);
2509 now = jiffies;
2510 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2511 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2512 else
2513 stored_lft = 0;
2514 if (!update_lft && !create && stored_lft) {
2515 const u32 minimum_lft = min_t(u32,
2516 stored_lft, MIN_VALID_LIFETIME);
2517 valid_lft = max(valid_lft, minimum_lft);
2518
2519 /* RFC4862 Section 5.5.3e:
2520 * "Note that the preferred lifetime of the
2521 * corresponding address is always reset to
2522 * the Preferred Lifetime in the received
2523 * Prefix Information option, regardless of
2524 * whether the valid lifetime is also reset or
2525 * ignored."
2526 *
2527 * So we should always update prefered_lft here.
2528 */
2529 update_lft = 1;
2530 }
2531
2532 if (update_lft) {
2533 ifp->valid_lft = valid_lft;
2534 ifp->prefered_lft = prefered_lft;
2535 ifp->tstamp = now;
2536 flags = ifp->flags;
2537 ifp->flags &= ~IFA_F_DEPRECATED;
2538 spin_unlock_bh(&ifp->lock);
2539
2540 if (!(flags&IFA_F_TENTATIVE))
2541 ipv6_ifa_notify(0, ifp);
2542 } else
2543 spin_unlock_bh(&ifp->lock);
2544
2545 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2546 create, now);
2547
2548 in6_ifa_put(ifp);
2549 addrconf_verify();
2550 }
2551
2552 return 0;
2553 }
2554 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2555
2556 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2557 {
2558 struct prefix_info *pinfo;
2559 __u32 valid_lft;
2560 __u32 prefered_lft;
2561 int addr_type, err;
2562 u32 addr_flags = 0;
2563 struct inet6_dev *in6_dev;
2564 struct net *net = dev_net(dev);
2565
2566 pinfo = (struct prefix_info *) opt;
2567
2568 if (len < sizeof(struct prefix_info)) {
2569 ADBG("addrconf: prefix option too short\n");
2570 return;
2571 }
2572
2573 /*
2574 * Validation checks ([ADDRCONF], page 19)
2575 */
2576
2577 addr_type = ipv6_addr_type(&pinfo->prefix);
2578
2579 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2580 return;
2581
2582 valid_lft = ntohl(pinfo->valid);
2583 prefered_lft = ntohl(pinfo->prefered);
2584
2585 if (prefered_lft > valid_lft) {
2586 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2587 return;
2588 }
2589
2590 in6_dev = in6_dev_get(dev);
2591
2592 if (!in6_dev) {
2593 net_dbg_ratelimited("addrconf: device %s not configured\n",
2594 dev->name);
2595 return;
2596 }
2597
2598 /*
2599 * Two things going on here:
2600 * 1) Add routes for on-link prefixes
2601 * 2) Configure prefixes with the auto flag set
2602 */
2603
2604 if (pinfo->onlink) {
2605 struct rt6_info *rt;
2606 unsigned long rt_expires;
2607
2608 /* Avoid arithmetic overflow. Really, we could
2609 * save rt_expires in seconds, likely valid_lft,
2610 * but it would require division in fib gc, that it
2611 * not good.
2612 */
2613 if (HZ > USER_HZ)
2614 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2615 else
2616 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2617
2618 if (addrconf_finite_timeout(rt_expires))
2619 rt_expires *= HZ;
2620
2621 rt = addrconf_get_prefix_route(&pinfo->prefix,
2622 pinfo->prefix_len,
2623 dev,
2624 RTF_ADDRCONF | RTF_PREFIX_RT,
2625 RTF_GATEWAY | RTF_DEFAULT);
2626
2627 if (rt) {
2628 /* Autoconf prefix route */
2629 if (valid_lft == 0) {
2630 ip6_del_rt(rt);
2631 rt = NULL;
2632 } else if (addrconf_finite_timeout(rt_expires)) {
2633 /* not infinity */
2634 rt6_set_expires(rt, jiffies + rt_expires);
2635 } else {
2636 rt6_clean_expires(rt);
2637 }
2638 } else if (valid_lft) {
2639 clock_t expires = 0;
2640 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2641 if (addrconf_finite_timeout(rt_expires)) {
2642 /* not infinity */
2643 flags |= RTF_EXPIRES;
2644 expires = jiffies_to_clock_t(rt_expires);
2645 }
2646 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2647 dev, expires, flags);
2648 }
2649 ip6_rt_put(rt);
2650 }
2651
2652 /* Try to figure out our local address for this prefix */
2653
2654 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2655 struct in6_addr addr;
2656 bool tokenized = false, dev_addr_generated = false;
2657
2658 if (pinfo->prefix_len == 64) {
2659 memcpy(&addr, &pinfo->prefix, 8);
2660
2661 if (!ipv6_addr_any(&in6_dev->token)) {
2662 read_lock_bh(&in6_dev->lock);
2663 memcpy(addr.s6_addr + 8,
2664 in6_dev->token.s6_addr + 8, 8);
2665 read_unlock_bh(&in6_dev->lock);
2666 tokenized = true;
2667 } else if (is_addr_mode_generate_stable(in6_dev) &&
2668 !ipv6_generate_stable_address(&addr, 0,
2669 in6_dev)) {
2670 addr_flags |= IFA_F_STABLE_PRIVACY;
2671 goto ok;
2672 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2673 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2674 goto put;
2675 } else {
2676 dev_addr_generated = true;
2677 }
2678 goto ok;
2679 }
2680 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2681 pinfo->prefix_len);
2682 goto put;
2683
2684 ok:
2685 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2686 &addr, addr_type,
2687 addr_flags, sllao,
2688 tokenized, valid_lft,
2689 prefered_lft);
2690 if (err)
2691 goto put;
2692
2693 /* Ignore error case here because previous prefix add addr was
2694 * successful which will be notified.
2695 */
2696 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2697 addr_type, addr_flags, sllao,
2698 tokenized, valid_lft,
2699 prefered_lft,
2700 dev_addr_generated);
2701 }
2702 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2703 put:
2704 in6_dev_put(in6_dev);
2705 }
2706
2707 /*
2708 * Set destination address.
2709 * Special case for SIT interfaces where we create a new "virtual"
2710 * device.
2711 */
2712 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2713 {
2714 struct in6_ifreq ireq;
2715 struct net_device *dev;
2716 int err = -EINVAL;
2717
2718 rtnl_lock();
2719
2720 err = -EFAULT;
2721 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2722 goto err_exit;
2723
2724 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2725
2726 err = -ENODEV;
2727 if (!dev)
2728 goto err_exit;
2729
2730 #if IS_ENABLED(CONFIG_IPV6_SIT)
2731 if (dev->type == ARPHRD_SIT) {
2732 const struct net_device_ops *ops = dev->netdev_ops;
2733 struct ifreq ifr;
2734 struct ip_tunnel_parm p;
2735
2736 err = -EADDRNOTAVAIL;
2737 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2738 goto err_exit;
2739
2740 memset(&p, 0, sizeof(p));
2741 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2742 p.iph.saddr = 0;
2743 p.iph.version = 4;
2744 p.iph.ihl = 5;
2745 p.iph.protocol = IPPROTO_IPV6;
2746 p.iph.ttl = 64;
2747 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2748
2749 if (ops->ndo_do_ioctl) {
2750 mm_segment_t oldfs = get_fs();
2751
2752 set_fs(KERNEL_DS);
2753 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2754 set_fs(oldfs);
2755 } else
2756 err = -EOPNOTSUPP;
2757
2758 if (err == 0) {
2759 err = -ENOBUFS;
2760 dev = __dev_get_by_name(net, p.name);
2761 if (!dev)
2762 goto err_exit;
2763 err = dev_open(dev);
2764 }
2765 }
2766 #endif
2767
2768 err_exit:
2769 rtnl_unlock();
2770 return err;
2771 }
2772
2773 static int ipv6_mc_config(struct sock *sk, bool join,
2774 const struct in6_addr *addr, int ifindex)
2775 {
2776 int ret;
2777
2778 ASSERT_RTNL();
2779
2780 lock_sock(sk);
2781 if (join)
2782 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2783 else
2784 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2785 release_sock(sk);
2786
2787 return ret;
2788 }
2789
2790 /*
2791 * Manual configuration of address on an interface
2792 */
2793 static int inet6_addr_add(struct net *net, int ifindex,
2794 const struct in6_addr *pfx,
2795 const struct in6_addr *peer_pfx,
2796 unsigned int plen, __u32 ifa_flags,
2797 __u32 prefered_lft, __u32 valid_lft)
2798 {
2799 struct inet6_ifaddr *ifp;
2800 struct inet6_dev *idev;
2801 struct net_device *dev;
2802 unsigned long timeout;
2803 clock_t expires;
2804 int scope;
2805 u32 flags;
2806
2807 ASSERT_RTNL();
2808
2809 if (plen > 128)
2810 return -EINVAL;
2811
2812 /* check the lifetime */
2813 if (!valid_lft || prefered_lft > valid_lft)
2814 return -EINVAL;
2815
2816 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2817 return -EINVAL;
2818
2819 dev = __dev_get_by_index(net, ifindex);
2820 if (!dev)
2821 return -ENODEV;
2822
2823 idev = addrconf_add_dev(dev);
2824 if (IS_ERR(idev))
2825 return PTR_ERR(idev);
2826
2827 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2828 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2829 true, pfx, ifindex);
2830
2831 if (ret < 0)
2832 return ret;
2833 }
2834
2835 scope = ipv6_addr_scope(pfx);
2836
2837 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2838 if (addrconf_finite_timeout(timeout)) {
2839 expires = jiffies_to_clock_t(timeout * HZ);
2840 valid_lft = timeout;
2841 flags = RTF_EXPIRES;
2842 } else {
2843 expires = 0;
2844 flags = 0;
2845 ifa_flags |= IFA_F_PERMANENT;
2846 }
2847
2848 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2849 if (addrconf_finite_timeout(timeout)) {
2850 if (timeout == 0)
2851 ifa_flags |= IFA_F_DEPRECATED;
2852 prefered_lft = timeout;
2853 }
2854
2855 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2856 valid_lft, prefered_lft);
2857
2858 if (!IS_ERR(ifp)) {
2859 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2860 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2861 expires, flags);
2862 }
2863
2864 /*
2865 * Note that section 3.1 of RFC 4429 indicates
2866 * that the Optimistic flag should not be set for
2867 * manually configured addresses
2868 */
2869 addrconf_dad_start(ifp);
2870 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2871 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2872 true, jiffies);
2873 in6_ifa_put(ifp);
2874 addrconf_verify_rtnl();
2875 return 0;
2876 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2877 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2878 false, pfx, ifindex);
2879 }
2880
2881 return PTR_ERR(ifp);
2882 }
2883
2884 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2885 const struct in6_addr *pfx, unsigned int plen)
2886 {
2887 struct inet6_ifaddr *ifp;
2888 struct inet6_dev *idev;
2889 struct net_device *dev;
2890
2891 if (plen > 128)
2892 return -EINVAL;
2893
2894 dev = __dev_get_by_index(net, ifindex);
2895 if (!dev)
2896 return -ENODEV;
2897
2898 idev = __in6_dev_get(dev);
2899 if (!idev)
2900 return -ENXIO;
2901
2902 read_lock_bh(&idev->lock);
2903 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2904 if (ifp->prefix_len == plen &&
2905 ipv6_addr_equal(pfx, &ifp->addr)) {
2906 in6_ifa_hold(ifp);
2907 read_unlock_bh(&idev->lock);
2908
2909 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2910 (ifa_flags & IFA_F_MANAGETEMPADDR))
2911 manage_tempaddrs(idev, ifp, 0, 0, false,
2912 jiffies);
2913 ipv6_del_addr(ifp);
2914 addrconf_verify_rtnl();
2915 if (ipv6_addr_is_multicast(pfx)) {
2916 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2917 false, pfx, dev->ifindex);
2918 }
2919 return 0;
2920 }
2921 }
2922 read_unlock_bh(&idev->lock);
2923 return -EADDRNOTAVAIL;
2924 }
2925
2926
2927 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2928 {
2929 struct in6_ifreq ireq;
2930 int err;
2931
2932 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2933 return -EPERM;
2934
2935 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2936 return -EFAULT;
2937
2938 rtnl_lock();
2939 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2940 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2941 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2942 rtnl_unlock();
2943 return err;
2944 }
2945
2946 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2947 {
2948 struct in6_ifreq ireq;
2949 int err;
2950
2951 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2952 return -EPERM;
2953
2954 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2955 return -EFAULT;
2956
2957 rtnl_lock();
2958 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2959 ireq.ifr6_prefixlen);
2960 rtnl_unlock();
2961 return err;
2962 }
2963
2964 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2965 int plen, int scope)
2966 {
2967 struct inet6_ifaddr *ifp;
2968
2969 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2970 scope, IFA_F_PERMANENT,
2971 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2972 if (!IS_ERR(ifp)) {
2973 spin_lock_bh(&ifp->lock);
2974 ifp->flags &= ~IFA_F_TENTATIVE;
2975 spin_unlock_bh(&ifp->lock);
2976 rt_genid_bump_ipv6(dev_net(idev->dev));
2977 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2978 in6_ifa_put(ifp);
2979 }
2980 }
2981
2982 #if IS_ENABLED(CONFIG_IPV6_SIT)
2983 static void sit_add_v4_addrs(struct inet6_dev *idev)
2984 {
2985 struct in6_addr addr;
2986 struct net_device *dev;
2987 struct net *net = dev_net(idev->dev);
2988 int scope, plen;
2989 u32 pflags = 0;
2990
2991 ASSERT_RTNL();
2992
2993 memset(&addr, 0, sizeof(struct in6_addr));
2994 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2995
2996 if (idev->dev->flags&IFF_POINTOPOINT) {
2997 addr.s6_addr32[0] = htonl(0xfe800000);
2998 scope = IFA_LINK;
2999 plen = 64;
3000 } else {
3001 scope = IPV6_ADDR_COMPATv4;
3002 plen = 96;
3003 pflags |= RTF_NONEXTHOP;
3004 }
3005
3006 if (addr.s6_addr32[3]) {
3007 add_addr(idev, &addr, plen, scope);
3008 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
3009 return;
3010 }
3011
3012 for_each_netdev(net, dev) {
3013 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3014 if (in_dev && (dev->flags & IFF_UP)) {
3015 struct in_ifaddr *ifa;
3016
3017 int flag = scope;
3018
3019 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
3020
3021 addr.s6_addr32[3] = ifa->ifa_local;
3022
3023 if (ifa->ifa_scope == RT_SCOPE_LINK)
3024 continue;
3025 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3026 if (idev->dev->flags&IFF_POINTOPOINT)
3027 continue;
3028 flag |= IFA_HOST;
3029 }
3030
3031 add_addr(idev, &addr, plen, flag);
3032 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3033 pflags);
3034 }
3035 }
3036 }
3037 }
3038 #endif
3039
3040 static void init_loopback(struct net_device *dev)
3041 {
3042 struct inet6_dev *idev;
3043
3044 /* ::1 */
3045
3046 ASSERT_RTNL();
3047
3048 idev = ipv6_find_idev(dev);
3049 if (!idev) {
3050 pr_debug("%s: add_dev failed\n", __func__);
3051 return;
3052 }
3053
3054 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3055 }
3056
3057 void addrconf_add_linklocal(struct inet6_dev *idev,
3058 const struct in6_addr *addr, u32 flags)
3059 {
3060 struct inet6_ifaddr *ifp;
3061 u32 addr_flags = flags | IFA_F_PERMANENT;
3062
3063 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3064 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3065 idev->cnf.optimistic_dad) &&
3066 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3067 addr_flags |= IFA_F_OPTIMISTIC;
3068 #endif
3069
3070 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3071 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3072 if (!IS_ERR(ifp)) {
3073 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3074 addrconf_dad_start(ifp);
3075 in6_ifa_put(ifp);
3076 }
3077 }
3078 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3079
3080 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3081 {
3082 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3083 return true;
3084
3085 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3086 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3087 return true;
3088
3089 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3090 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3091 return true;
3092
3093 return false;
3094 }
3095
3096 static int ipv6_generate_stable_address(struct in6_addr *address,
3097 u8 dad_count,
3098 const struct inet6_dev *idev)
3099 {
3100 static DEFINE_SPINLOCK(lock);
3101 static __u32 digest[SHA_DIGEST_WORDS];
3102 static __u32 workspace[SHA_WORKSPACE_WORDS];
3103
3104 static union {
3105 char __data[SHA_MESSAGE_BYTES];
3106 struct {
3107 struct in6_addr secret;
3108 __be32 prefix[2];
3109 unsigned char hwaddr[MAX_ADDR_LEN];
3110 u8 dad_count;
3111 } __packed;
3112 } data;
3113
3114 struct in6_addr secret;
3115 struct in6_addr temp;
3116 struct net *net = dev_net(idev->dev);
3117
3118 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3119
3120 if (idev->cnf.stable_secret.initialized)
3121 secret = idev->cnf.stable_secret.secret;
3122 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3123 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3124 else
3125 return -1;
3126
3127 retry:
3128 spin_lock_bh(&lock);
3129
3130 sha_init(digest);
3131 memset(&data, 0, sizeof(data));
3132 memset(workspace, 0, sizeof(workspace));
3133 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3134 data.prefix[0] = address->s6_addr32[0];
3135 data.prefix[1] = address->s6_addr32[1];
3136 data.secret = secret;
3137 data.dad_count = dad_count;
3138
3139 sha_transform(digest, data.__data, workspace);
3140
3141 temp = *address;
3142 temp.s6_addr32[2] = (__force __be32)digest[0];
3143 temp.s6_addr32[3] = (__force __be32)digest[1];
3144
3145 spin_unlock_bh(&lock);
3146
3147 if (ipv6_reserved_interfaceid(temp)) {
3148 dad_count++;
3149 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3150 return -1;
3151 goto retry;
3152 }
3153
3154 *address = temp;
3155 return 0;
3156 }
3157
3158 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3159 {
3160 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3161
3162 if (s->initialized)
3163 return;
3164 s = &idev->cnf.stable_secret;
3165 get_random_bytes(&s->secret, sizeof(s->secret));
3166 s->initialized = true;
3167 }
3168
3169 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3170 {
3171 struct in6_addr addr;
3172
3173 /* no link local addresses on L3 master devices */
3174 if (netif_is_l3_master(idev->dev))
3175 return;
3176
3177 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3178
3179 switch (idev->cnf.addr_gen_mode) {
3180 case IN6_ADDR_GEN_MODE_RANDOM:
3181 ipv6_gen_mode_random_init(idev);
3182 /* fallthrough */
3183 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3184 if (!ipv6_generate_stable_address(&addr, 0, idev))
3185 addrconf_add_linklocal(idev, &addr,
3186 IFA_F_STABLE_PRIVACY);
3187 else if (prefix_route)
3188 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3189 break;
3190 case IN6_ADDR_GEN_MODE_EUI64:
3191 /* addrconf_add_linklocal also adds a prefix_route and we
3192 * only need to care about prefix routes if ipv6_generate_eui64
3193 * couldn't generate one.
3194 */
3195 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3196 addrconf_add_linklocal(idev, &addr, 0);
3197 else if (prefix_route)
3198 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3199 break;
3200 case IN6_ADDR_GEN_MODE_NONE:
3201 default:
3202 /* will not add any link local address */
3203 break;
3204 }
3205 }
3206
3207 static void addrconf_dev_config(struct net_device *dev)
3208 {
3209 struct inet6_dev *idev;
3210
3211 ASSERT_RTNL();
3212
3213 if ((dev->type != ARPHRD_ETHER) &&
3214 (dev->type != ARPHRD_FDDI) &&
3215 (dev->type != ARPHRD_ARCNET) &&
3216 (dev->type != ARPHRD_INFINIBAND) &&
3217 (dev->type != ARPHRD_IEEE1394) &&
3218 (dev->type != ARPHRD_TUNNEL6) &&
3219 (dev->type != ARPHRD_6LOWPAN) &&
3220 (dev->type != ARPHRD_IP6GRE) &&
3221 (dev->type != ARPHRD_IPGRE) &&
3222 (dev->type != ARPHRD_TUNNEL) &&
3223 (dev->type != ARPHRD_NONE)) {
3224 /* Alas, we support only Ethernet autoconfiguration. */
3225 return;
3226 }
3227
3228 idev = addrconf_add_dev(dev);
3229 if (IS_ERR(idev))
3230 return;
3231
3232 /* this device type has no EUI support */
3233 if (dev->type == ARPHRD_NONE &&
3234 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3235 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3236
3237 addrconf_addr_gen(idev, false);
3238 }
3239
3240 #if IS_ENABLED(CONFIG_IPV6_SIT)
3241 static void addrconf_sit_config(struct net_device *dev)
3242 {
3243 struct inet6_dev *idev;
3244
3245 ASSERT_RTNL();
3246
3247 /*
3248 * Configure the tunnel with one of our IPv4
3249 * addresses... we should configure all of
3250 * our v4 addrs in the tunnel
3251 */
3252
3253 idev = ipv6_find_idev(dev);
3254 if (!idev) {
3255 pr_debug("%s: add_dev failed\n", __func__);
3256 return;
3257 }
3258
3259 if (dev->priv_flags & IFF_ISATAP) {
3260 addrconf_addr_gen(idev, false);
3261 return;
3262 }
3263
3264 sit_add_v4_addrs(idev);
3265
3266 if (dev->flags&IFF_POINTOPOINT)
3267 addrconf_add_mroute(dev);
3268 }
3269 #endif
3270
3271 #if IS_ENABLED(CONFIG_NET_IPGRE)
3272 static void addrconf_gre_config(struct net_device *dev)
3273 {
3274 struct inet6_dev *idev;
3275
3276 ASSERT_RTNL();
3277
3278 idev = ipv6_find_idev(dev);
3279 if (!idev) {
3280 pr_debug("%s: add_dev failed\n", __func__);
3281 return;
3282 }
3283
3284 addrconf_addr_gen(idev, true);
3285 if (dev->flags & IFF_POINTOPOINT)
3286 addrconf_add_mroute(dev);
3287 }
3288 #endif
3289
3290 static int fixup_permanent_addr(struct inet6_dev *idev,
3291 struct inet6_ifaddr *ifp)
3292 {
3293 /* !rt6i_node means the host route was removed from the
3294 * FIB, for example, if 'lo' device is taken down. In that
3295 * case regenerate the host route.
3296 */
3297 if (!ifp->rt || !ifp->rt->rt6i_node) {
3298 struct rt6_info *rt, *prev;
3299
3300 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3301 if (unlikely(IS_ERR(rt)))
3302 return PTR_ERR(rt);
3303
3304 /* ifp->rt can be accessed outside of rtnl */
3305 spin_lock(&ifp->lock);
3306 prev = ifp->rt;
3307 ifp->rt = rt;
3308 spin_unlock(&ifp->lock);
3309
3310 ip6_rt_put(prev);
3311 }
3312
3313 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3314 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3315 idev->dev, 0, 0);
3316 }
3317
3318 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3319 addrconf_dad_start(ifp);
3320
3321 return 0;
3322 }
3323
3324 static void addrconf_permanent_addr(struct net_device *dev)
3325 {
3326 struct inet6_ifaddr *ifp, *tmp;
3327 struct inet6_dev *idev;
3328
3329 idev = __in6_dev_get(dev);
3330 if (!idev)
3331 return;
3332
3333 write_lock_bh(&idev->lock);
3334
3335 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3336 if ((ifp->flags & IFA_F_PERMANENT) &&
3337 fixup_permanent_addr(idev, ifp) < 0) {
3338 write_unlock_bh(&idev->lock);
3339 in6_ifa_hold(ifp);
3340 ipv6_del_addr(ifp);
3341 write_lock_bh(&idev->lock);
3342
3343 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3344 idev->dev->name, &ifp->addr);
3345 }
3346 }
3347
3348 write_unlock_bh(&idev->lock);
3349 }
3350
3351 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3352 void *ptr)
3353 {
3354 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3355 struct netdev_notifier_changeupper_info *info;
3356 struct inet6_dev *idev = __in6_dev_get(dev);
3357 struct net *net = dev_net(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, dev != net->loopback_dev);
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_link_ready(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_link_ready(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, dev != net->loopback_dev);
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 .priority = ADDRCONF_NOTIFY_PRIORITY,
3541 };
3542
3543 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3544 {
3545 struct inet6_dev *idev;
3546 ASSERT_RTNL();
3547
3548 idev = __in6_dev_get(dev);
3549
3550 if (event == NETDEV_POST_TYPE_CHANGE)
3551 ipv6_mc_remap(idev);
3552 else if (event == NETDEV_PRE_TYPE_CHANGE)
3553 ipv6_mc_unmap(idev);
3554 }
3555
3556 static bool addr_is_local(const struct in6_addr *addr)
3557 {
3558 return ipv6_addr_type(addr) &
3559 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3560 }
3561
3562 static int addrconf_ifdown(struct net_device *dev, int how)
3563 {
3564 struct net *net = dev_net(dev);
3565 struct inet6_dev *idev;
3566 struct inet6_ifaddr *ifa, *tmp;
3567 struct list_head del_list;
3568 int _keep_addr;
3569 bool keep_addr;
3570 int state, i;
3571
3572 ASSERT_RTNL();
3573
3574 rt6_ifdown(net, dev);
3575 neigh_ifdown(&nd_tbl, dev);
3576
3577 idev = __in6_dev_get(dev);
3578 if (!idev)
3579 return -ENODEV;
3580
3581 /*
3582 * Step 1: remove reference to ipv6 device from parent device.
3583 * Do not dev_put!
3584 */
3585 if (how) {
3586 idev->dead = 1;
3587
3588 /* protected by rtnl_lock */
3589 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3590
3591 /* Step 1.5: remove snmp6 entry */
3592 snmp6_unregister_dev(idev);
3593
3594 }
3595
3596 /* aggregate the system setting and interface setting */
3597 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3598 if (!_keep_addr)
3599 _keep_addr = idev->cnf.keep_addr_on_down;
3600
3601 /* combine the user config with event to determine if permanent
3602 * addresses are to be removed from address hash table
3603 */
3604 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3605
3606 /* Step 2: clear hash table */
3607 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3608 struct hlist_head *h = &inet6_addr_lst[i];
3609
3610 spin_lock_bh(&addrconf_hash_lock);
3611 restart:
3612 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3613 if (ifa->idev == idev) {
3614 addrconf_del_dad_work(ifa);
3615 /* combined flag + permanent flag decide if
3616 * address is retained on a down event
3617 */
3618 if (!keep_addr ||
3619 !(ifa->flags & IFA_F_PERMANENT) ||
3620 addr_is_local(&ifa->addr)) {
3621 hlist_del_init_rcu(&ifa->addr_lst);
3622 goto restart;
3623 }
3624 }
3625 }
3626 spin_unlock_bh(&addrconf_hash_lock);
3627 }
3628
3629 write_lock_bh(&idev->lock);
3630
3631 addrconf_del_rs_timer(idev);
3632
3633 /* Step 2: clear flags for stateless addrconf */
3634 if (!how)
3635 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3636
3637 /* Step 3: clear tempaddr list */
3638 while (!list_empty(&idev->tempaddr_list)) {
3639 ifa = list_first_entry(&idev->tempaddr_list,
3640 struct inet6_ifaddr, tmp_list);
3641 list_del(&ifa->tmp_list);
3642 write_unlock_bh(&idev->lock);
3643 spin_lock_bh(&ifa->lock);
3644
3645 if (ifa->ifpub) {
3646 in6_ifa_put(ifa->ifpub);
3647 ifa->ifpub = NULL;
3648 }
3649 spin_unlock_bh(&ifa->lock);
3650 in6_ifa_put(ifa);
3651 write_lock_bh(&idev->lock);
3652 }
3653
3654 /* re-combine the user config with event to determine if permanent
3655 * addresses are to be removed from the interface list
3656 */
3657 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3658
3659 INIT_LIST_HEAD(&del_list);
3660 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3661 struct rt6_info *rt = NULL;
3662 bool keep;
3663
3664 addrconf_del_dad_work(ifa);
3665
3666 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3667 !addr_is_local(&ifa->addr);
3668 if (!keep)
3669 list_move(&ifa->if_list, &del_list);
3670
3671 write_unlock_bh(&idev->lock);
3672 spin_lock_bh(&ifa->lock);
3673
3674 if (keep) {
3675 /* set state to skip the notifier below */
3676 state = INET6_IFADDR_STATE_DEAD;
3677 ifa->state = INET6_IFADDR_STATE_PREDAD;
3678 if (!(ifa->flags & IFA_F_NODAD))
3679 ifa->flags |= IFA_F_TENTATIVE;
3680
3681 rt = ifa->rt;
3682 ifa->rt = NULL;
3683 } else {
3684 state = ifa->state;
3685 ifa->state = INET6_IFADDR_STATE_DEAD;
3686 }
3687
3688 spin_unlock_bh(&ifa->lock);
3689
3690 if (rt)
3691 ip6_del_rt(rt);
3692
3693 if (state != INET6_IFADDR_STATE_DEAD) {
3694 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3695 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3696 } else {
3697 if (idev->cnf.forwarding)
3698 addrconf_leave_anycast(ifa);
3699 addrconf_leave_solict(ifa->idev, &ifa->addr);
3700 }
3701
3702 write_lock_bh(&idev->lock);
3703 }
3704
3705 write_unlock_bh(&idev->lock);
3706
3707 /* now clean up addresses to be removed */
3708 while (!list_empty(&del_list)) {
3709 ifa = list_first_entry(&del_list,
3710 struct inet6_ifaddr, if_list);
3711 list_del(&ifa->if_list);
3712
3713 in6_ifa_put(ifa);
3714 }
3715
3716 /* Step 5: Discard anycast and multicast list */
3717 if (how) {
3718 ipv6_ac_destroy_dev(idev);
3719 ipv6_mc_destroy_dev(idev);
3720 } else {
3721 ipv6_mc_down(idev);
3722 }
3723
3724 idev->tstamp = jiffies;
3725
3726 /* Last: Shot the device (if unregistered) */
3727 if (how) {
3728 addrconf_sysctl_unregister(idev);
3729 neigh_parms_release(&nd_tbl, idev->nd_parms);
3730 neigh_ifdown(&nd_tbl, dev);
3731 in6_dev_put(idev);
3732 }
3733 return 0;
3734 }
3735
3736 static void addrconf_rs_timer(unsigned long data)
3737 {
3738 struct inet6_dev *idev = (struct inet6_dev *)data;
3739 struct net_device *dev = idev->dev;
3740 struct in6_addr lladdr;
3741
3742 write_lock(&idev->lock);
3743 if (idev->dead || !(idev->if_flags & IF_READY))
3744 goto out;
3745
3746 if (!ipv6_accept_ra(idev))
3747 goto out;
3748
3749 /* Announcement received after solicitation was sent */
3750 if (idev->if_flags & IF_RA_RCVD)
3751 goto out;
3752
3753 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3754 write_unlock(&idev->lock);
3755 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3756 ndisc_send_rs(dev, &lladdr,
3757 &in6addr_linklocal_allrouters);
3758 else
3759 goto put;
3760
3761 write_lock(&idev->lock);
3762 idev->rs_interval = rfc3315_s14_backoff_update(
3763 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3764 /* The wait after the last probe can be shorter */
3765 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3766 idev->cnf.rtr_solicits) ?
3767 idev->cnf.rtr_solicit_delay :
3768 idev->rs_interval);
3769 } else {
3770 /*
3771 * Note: we do not support deprecated "all on-link"
3772 * assumption any longer.
3773 */
3774 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3775 }
3776
3777 out:
3778 write_unlock(&idev->lock);
3779 put:
3780 in6_dev_put(idev);
3781 }
3782
3783 /*
3784 * Duplicate Address Detection
3785 */
3786 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3787 {
3788 unsigned long rand_num;
3789 struct inet6_dev *idev = ifp->idev;
3790 u64 nonce;
3791
3792 if (ifp->flags & IFA_F_OPTIMISTIC)
3793 rand_num = 0;
3794 else
3795 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3796
3797 nonce = 0;
3798 if (idev->cnf.enhanced_dad ||
3799 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3800 do
3801 get_random_bytes(&nonce, 6);
3802 while (nonce == 0);
3803 }
3804 ifp->dad_nonce = nonce;
3805 ifp->dad_probes = idev->cnf.dad_transmits;
3806 addrconf_mod_dad_work(ifp, rand_num);
3807 }
3808
3809 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3810 {
3811 struct inet6_dev *idev = ifp->idev;
3812 struct net_device *dev = idev->dev;
3813 bool bump_id, notify = false;
3814
3815 addrconf_join_solict(dev, &ifp->addr);
3816
3817 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3818
3819 read_lock_bh(&idev->lock);
3820 spin_lock(&ifp->lock);
3821 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3822 goto out;
3823
3824 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3825 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 &&
3826 idev->cnf.accept_dad < 1) ||
3827 !(ifp->flags&IFA_F_TENTATIVE) ||
3828 ifp->flags & IFA_F_NODAD) {
3829 bool send_na = false;
3830
3831 if (ifp->flags & IFA_F_TENTATIVE &&
3832 !(ifp->flags & IFA_F_OPTIMISTIC))
3833 send_na = true;
3834 bump_id = ifp->flags & IFA_F_TENTATIVE;
3835 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3836 spin_unlock(&ifp->lock);
3837 read_unlock_bh(&idev->lock);
3838
3839 addrconf_dad_completed(ifp, bump_id, send_na);
3840 return;
3841 }
3842
3843 if (!(idev->if_flags & IF_READY)) {
3844 spin_unlock(&ifp->lock);
3845 read_unlock_bh(&idev->lock);
3846 /*
3847 * If the device is not ready:
3848 * - keep it tentative if it is a permanent address.
3849 * - otherwise, kill it.
3850 */
3851 in6_ifa_hold(ifp);
3852 addrconf_dad_stop(ifp, 0);
3853 return;
3854 }
3855
3856 /*
3857 * Optimistic nodes can start receiving
3858 * Frames right away
3859 */
3860 if (ifp->flags & IFA_F_OPTIMISTIC) {
3861 ip6_ins_rt(ifp->rt);
3862 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) {
3863 /* Because optimistic nodes can use this address,
3864 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3865 */
3866 notify = true;
3867 }
3868 }
3869
3870 addrconf_dad_kick(ifp);
3871 out:
3872 spin_unlock(&ifp->lock);
3873 read_unlock_bh(&idev->lock);
3874 if (notify)
3875 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3876 }
3877
3878 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3879 {
3880 bool begin_dad = false;
3881
3882 spin_lock_bh(&ifp->lock);
3883 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3884 ifp->state = INET6_IFADDR_STATE_PREDAD;
3885 begin_dad = true;
3886 }
3887 spin_unlock_bh(&ifp->lock);
3888
3889 if (begin_dad)
3890 addrconf_mod_dad_work(ifp, 0);
3891 }
3892
3893 static void addrconf_dad_work(struct work_struct *w)
3894 {
3895 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3896 struct inet6_ifaddr,
3897 dad_work);
3898 struct inet6_dev *idev = ifp->idev;
3899 bool bump_id, disable_ipv6 = false;
3900 struct in6_addr mcaddr;
3901
3902 enum {
3903 DAD_PROCESS,
3904 DAD_BEGIN,
3905 DAD_ABORT,
3906 } action = DAD_PROCESS;
3907
3908 rtnl_lock();
3909
3910 spin_lock_bh(&ifp->lock);
3911 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3912 action = DAD_BEGIN;
3913 ifp->state = INET6_IFADDR_STATE_DAD;
3914 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3915 action = DAD_ABORT;
3916 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3917
3918 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3919 idev->cnf.accept_dad > 1) &&
3920 !idev->cnf.disable_ipv6 &&
3921 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3922 struct in6_addr addr;
3923
3924 addr.s6_addr32[0] = htonl(0xfe800000);
3925 addr.s6_addr32[1] = 0;
3926
3927 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3928 ipv6_addr_equal(&ifp->addr, &addr)) {
3929 /* DAD failed for link-local based on MAC */
3930 idev->cnf.disable_ipv6 = 1;
3931
3932 pr_info("%s: IPv6 being disabled!\n",
3933 ifp->idev->dev->name);
3934 disable_ipv6 = true;
3935 }
3936 }
3937 }
3938 spin_unlock_bh(&ifp->lock);
3939
3940 if (action == DAD_BEGIN) {
3941 addrconf_dad_begin(ifp);
3942 goto out;
3943 } else if (action == DAD_ABORT) {
3944 in6_ifa_hold(ifp);
3945 addrconf_dad_stop(ifp, 1);
3946 if (disable_ipv6)
3947 addrconf_ifdown(idev->dev, 0);
3948 goto out;
3949 }
3950
3951 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3952 goto out;
3953
3954 write_lock_bh(&idev->lock);
3955 if (idev->dead || !(idev->if_flags & IF_READY)) {
3956 write_unlock_bh(&idev->lock);
3957 goto out;
3958 }
3959
3960 spin_lock(&ifp->lock);
3961 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3962 spin_unlock(&ifp->lock);
3963 write_unlock_bh(&idev->lock);
3964 goto out;
3965 }
3966
3967 if (ifp->dad_probes == 0) {
3968 bool send_na = false;
3969
3970 /*
3971 * DAD was successful
3972 */
3973
3974 if (ifp->flags & IFA_F_TENTATIVE &&
3975 !(ifp->flags & IFA_F_OPTIMISTIC))
3976 send_na = true;
3977 bump_id = ifp->flags & IFA_F_TENTATIVE;
3978 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3979 spin_unlock(&ifp->lock);
3980 write_unlock_bh(&idev->lock);
3981
3982 addrconf_dad_completed(ifp, bump_id, send_na);
3983
3984 goto out;
3985 }
3986
3987 ifp->dad_probes--;
3988 addrconf_mod_dad_work(ifp,
3989 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3990 spin_unlock(&ifp->lock);
3991 write_unlock_bh(&idev->lock);
3992
3993 /* send a neighbour solicitation for our addr */
3994 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3995 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3996 ifp->dad_nonce);
3997 out:
3998 in6_ifa_put(ifp);
3999 rtnl_unlock();
4000 }
4001
4002 /* ifp->idev must be at least read locked */
4003 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4004 {
4005 struct inet6_ifaddr *ifpiter;
4006 struct inet6_dev *idev = ifp->idev;
4007
4008 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4009 if (ifpiter->scope > IFA_LINK)
4010 break;
4011 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4012 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4013 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4014 IFA_F_PERMANENT)
4015 return false;
4016 }
4017 return true;
4018 }
4019
4020 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4021 bool send_na)
4022 {
4023 struct net_device *dev = ifp->idev->dev;
4024 struct in6_addr lladdr;
4025 bool send_rs, send_mld;
4026
4027 addrconf_del_dad_work(ifp);
4028
4029 /*
4030 * Configure the address for reception. Now it is valid.
4031 */
4032
4033 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4034
4035 /* If added prefix is link local and we are prepared to process
4036 router advertisements, start sending router solicitations.
4037 */
4038
4039 read_lock_bh(&ifp->idev->lock);
4040 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4041 send_rs = send_mld &&
4042 ipv6_accept_ra(ifp->idev) &&
4043 ifp->idev->cnf.rtr_solicits != 0 &&
4044 (dev->flags&IFF_LOOPBACK) == 0;
4045 read_unlock_bh(&ifp->idev->lock);
4046
4047 /* While dad is in progress mld report's source address is in6_addrany.
4048 * Resend with proper ll now.
4049 */
4050 if (send_mld)
4051 ipv6_mc_dad_complete(ifp->idev);
4052
4053 /* send unsolicited NA if enabled */
4054 if (send_na &&
4055 (ifp->idev->cnf.ndisc_notify ||
4056 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4057 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4058 /*router=*/ !!ifp->idev->cnf.forwarding,
4059 /*solicited=*/ false, /*override=*/ true,
4060 /*inc_opt=*/ true);
4061 }
4062
4063 if (send_rs) {
4064 /*
4065 * If a host as already performed a random delay
4066 * [...] as part of DAD [...] there is no need
4067 * to delay again before sending the first RS
4068 */
4069 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4070 return;
4071 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4072
4073 write_lock_bh(&ifp->idev->lock);
4074 spin_lock(&ifp->lock);
4075 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4076 ifp->idev->cnf.rtr_solicit_interval);
4077 ifp->idev->rs_probes = 1;
4078 ifp->idev->if_flags |= IF_RS_SENT;
4079 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4080 spin_unlock(&ifp->lock);
4081 write_unlock_bh(&ifp->idev->lock);
4082 }
4083
4084 if (bump_id)
4085 rt_genid_bump_ipv6(dev_net(dev));
4086
4087 /* Make sure that a new temporary address will be created
4088 * before this temporary address becomes deprecated.
4089 */
4090 if (ifp->flags & IFA_F_TEMPORARY)
4091 addrconf_verify_rtnl();
4092 }
4093
4094 static void addrconf_dad_run(struct inet6_dev *idev)
4095 {
4096 struct inet6_ifaddr *ifp;
4097
4098 read_lock_bh(&idev->lock);
4099 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4100 spin_lock(&ifp->lock);
4101 if (ifp->flags & IFA_F_TENTATIVE &&
4102 ifp->state == INET6_IFADDR_STATE_DAD)
4103 addrconf_dad_kick(ifp);
4104 spin_unlock(&ifp->lock);
4105 }
4106 read_unlock_bh(&idev->lock);
4107 }
4108
4109 #ifdef CONFIG_PROC_FS
4110 struct if6_iter_state {
4111 struct seq_net_private p;
4112 int bucket;
4113 int offset;
4114 };
4115
4116 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4117 {
4118 struct inet6_ifaddr *ifa = NULL;
4119 struct if6_iter_state *state = seq->private;
4120 struct net *net = seq_file_net(seq);
4121 int p = 0;
4122
4123 /* initial bucket if pos is 0 */
4124 if (pos == 0) {
4125 state->bucket = 0;
4126 state->offset = 0;
4127 }
4128
4129 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4130 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4131 addr_lst) {
4132 if (!net_eq(dev_net(ifa->idev->dev), net))
4133 continue;
4134 /* sync with offset */
4135 if (p < state->offset) {
4136 p++;
4137 continue;
4138 }
4139 state->offset++;
4140 return ifa;
4141 }
4142
4143 /* prepare for next bucket */
4144 state->offset = 0;
4145 p = 0;
4146 }
4147 return NULL;
4148 }
4149
4150 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4151 struct inet6_ifaddr *ifa)
4152 {
4153 struct if6_iter_state *state = seq->private;
4154 struct net *net = seq_file_net(seq);
4155
4156 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4157 if (!net_eq(dev_net(ifa->idev->dev), net))
4158 continue;
4159 state->offset++;
4160 return ifa;
4161 }
4162
4163 while (++state->bucket < IN6_ADDR_HSIZE) {
4164 state->offset = 0;
4165 hlist_for_each_entry_rcu_bh(ifa,
4166 &inet6_addr_lst[state->bucket], addr_lst) {
4167 if (!net_eq(dev_net(ifa->idev->dev), net))
4168 continue;
4169 state->offset++;
4170 return ifa;
4171 }
4172 }
4173
4174 return NULL;
4175 }
4176
4177 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4178 __acquires(rcu_bh)
4179 {
4180 rcu_read_lock_bh();
4181 return if6_get_first(seq, *pos);
4182 }
4183
4184 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4185 {
4186 struct inet6_ifaddr *ifa;
4187
4188 ifa = if6_get_next(seq, v);
4189 ++*pos;
4190 return ifa;
4191 }
4192
4193 static void if6_seq_stop(struct seq_file *seq, void *v)
4194 __releases(rcu_bh)
4195 {
4196 rcu_read_unlock_bh();
4197 }
4198
4199 static int if6_seq_show(struct seq_file *seq, void *v)
4200 {
4201 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4202 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4203 &ifp->addr,
4204 ifp->idev->dev->ifindex,
4205 ifp->prefix_len,
4206 ifp->scope,
4207 (u8) ifp->flags,
4208 ifp->idev->dev->name);
4209 return 0;
4210 }
4211
4212 static const struct seq_operations if6_seq_ops = {
4213 .start = if6_seq_start,
4214 .next = if6_seq_next,
4215 .show = if6_seq_show,
4216 .stop = if6_seq_stop,
4217 };
4218
4219 static int if6_seq_open(struct inode *inode, struct file *file)
4220 {
4221 return seq_open_net(inode, file, &if6_seq_ops,
4222 sizeof(struct if6_iter_state));
4223 }
4224
4225 static const struct file_operations if6_fops = {
4226 .owner = THIS_MODULE,
4227 .open = if6_seq_open,
4228 .read = seq_read,
4229 .llseek = seq_lseek,
4230 .release = seq_release_net,
4231 };
4232
4233 static int __net_init if6_proc_net_init(struct net *net)
4234 {
4235 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4236 return -ENOMEM;
4237 return 0;
4238 }
4239
4240 static void __net_exit if6_proc_net_exit(struct net *net)
4241 {
4242 remove_proc_entry("if_inet6", net->proc_net);
4243 }
4244
4245 static struct pernet_operations if6_proc_net_ops = {
4246 .init = if6_proc_net_init,
4247 .exit = if6_proc_net_exit,
4248 };
4249
4250 int __init if6_proc_init(void)
4251 {
4252 return register_pernet_subsys(&if6_proc_net_ops);
4253 }
4254
4255 void if6_proc_exit(void)
4256 {
4257 unregister_pernet_subsys(&if6_proc_net_ops);
4258 }
4259 #endif /* CONFIG_PROC_FS */
4260
4261 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4262 /* Check if address is a home address configured on any interface. */
4263 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4264 {
4265 int ret = 0;
4266 struct inet6_ifaddr *ifp = NULL;
4267 unsigned int hash = inet6_addr_hash(addr);
4268
4269 rcu_read_lock_bh();
4270 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4271 if (!net_eq(dev_net(ifp->idev->dev), net))
4272 continue;
4273 if (ipv6_addr_equal(&ifp->addr, addr) &&
4274 (ifp->flags & IFA_F_HOMEADDRESS)) {
4275 ret = 1;
4276 break;
4277 }
4278 }
4279 rcu_read_unlock_bh();
4280 return ret;
4281 }
4282 #endif
4283
4284 /*
4285 * Periodic address status verification
4286 */
4287
4288 static void addrconf_verify_rtnl(void)
4289 {
4290 unsigned long now, next, next_sec, next_sched;
4291 struct inet6_ifaddr *ifp;
4292 int i;
4293
4294 ASSERT_RTNL();
4295
4296 rcu_read_lock_bh();
4297 now = jiffies;
4298 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4299
4300 cancel_delayed_work(&addr_chk_work);
4301
4302 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4303 restart:
4304 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4305 unsigned long age;
4306
4307 /* When setting preferred_lft to a value not zero or
4308 * infinity, while valid_lft is infinity
4309 * IFA_F_PERMANENT has a non-infinity life time.
4310 */
4311 if ((ifp->flags & IFA_F_PERMANENT) &&
4312 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4313 continue;
4314
4315 spin_lock(&ifp->lock);
4316 /* We try to batch several events at once. */
4317 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4318
4319 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4320 age >= ifp->valid_lft) {
4321 spin_unlock(&ifp->lock);
4322 in6_ifa_hold(ifp);
4323 ipv6_del_addr(ifp);
4324 goto restart;
4325 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4326 spin_unlock(&ifp->lock);
4327 continue;
4328 } else if (age >= ifp->prefered_lft) {
4329 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4330 int deprecate = 0;
4331
4332 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4333 deprecate = 1;
4334 ifp->flags |= IFA_F_DEPRECATED;
4335 }
4336
4337 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4338 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4339 next = ifp->tstamp + ifp->valid_lft * HZ;
4340
4341 spin_unlock(&ifp->lock);
4342
4343 if (deprecate) {
4344 in6_ifa_hold(ifp);
4345
4346 ipv6_ifa_notify(0, ifp);
4347 in6_ifa_put(ifp);
4348 goto restart;
4349 }
4350 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4351 !(ifp->flags&IFA_F_TENTATIVE)) {
4352 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4353 ifp->idev->cnf.dad_transmits *
4354 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4355
4356 if (age >= ifp->prefered_lft - regen_advance) {
4357 struct inet6_ifaddr *ifpub = ifp->ifpub;
4358 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4359 next = ifp->tstamp + ifp->prefered_lft * HZ;
4360 if (!ifp->regen_count && ifpub) {
4361 ifp->regen_count++;
4362 in6_ifa_hold(ifp);
4363 in6_ifa_hold(ifpub);
4364 spin_unlock(&ifp->lock);
4365
4366 spin_lock(&ifpub->lock);
4367 ifpub->regen_count = 0;
4368 spin_unlock(&ifpub->lock);
4369 ipv6_create_tempaddr(ifpub, ifp);
4370 in6_ifa_put(ifpub);
4371 in6_ifa_put(ifp);
4372 goto restart;
4373 }
4374 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4375 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4376 spin_unlock(&ifp->lock);
4377 } else {
4378 /* ifp->prefered_lft <= ifp->valid_lft */
4379 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4380 next = ifp->tstamp + ifp->prefered_lft * HZ;
4381 spin_unlock(&ifp->lock);
4382 }
4383 }
4384 }
4385
4386 next_sec = round_jiffies_up(next);
4387 next_sched = next;
4388
4389 /* If rounded timeout is accurate enough, accept it. */
4390 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4391 next_sched = next_sec;
4392
4393 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4394 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4395 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4396
4397 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4398 now, next, next_sec, next_sched);
4399 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4400 rcu_read_unlock_bh();
4401 }
4402
4403 static void addrconf_verify_work(struct work_struct *w)
4404 {
4405 rtnl_lock();
4406 addrconf_verify_rtnl();
4407 rtnl_unlock();
4408 }
4409
4410 static void addrconf_verify(void)
4411 {
4412 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4413 }
4414
4415 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4416 struct in6_addr **peer_pfx)
4417 {
4418 struct in6_addr *pfx = NULL;
4419
4420 *peer_pfx = NULL;
4421
4422 if (addr)
4423 pfx = nla_data(addr);
4424
4425 if (local) {
4426 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4427 *peer_pfx = pfx;
4428 pfx = nla_data(local);
4429 }
4430
4431 return pfx;
4432 }
4433
4434 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4435 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4436 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4437 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4438 [IFA_FLAGS] = { .len = sizeof(u32) },
4439 };
4440
4441 static int
4442 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4443 struct netlink_ext_ack *extack)
4444 {
4445 struct net *net = sock_net(skb->sk);
4446 struct ifaddrmsg *ifm;
4447 struct nlattr *tb[IFA_MAX+1];
4448 struct in6_addr *pfx, *peer_pfx;
4449 u32 ifa_flags;
4450 int err;
4451
4452 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4453 extack);
4454 if (err < 0)
4455 return err;
4456
4457 ifm = nlmsg_data(nlh);
4458 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4459 if (!pfx)
4460 return -EINVAL;
4461
4462 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4463
4464 /* We ignore other flags so far. */
4465 ifa_flags &= IFA_F_MANAGETEMPADDR;
4466
4467 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4468 ifm->ifa_prefixlen);
4469 }
4470
4471 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4472 u32 prefered_lft, u32 valid_lft)
4473 {
4474 u32 flags;
4475 clock_t expires;
4476 unsigned long timeout;
4477 bool was_managetempaddr;
4478 bool had_prefixroute;
4479
4480 ASSERT_RTNL();
4481
4482 if (!valid_lft || (prefered_lft > valid_lft))
4483 return -EINVAL;
4484
4485 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4486 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4487 return -EINVAL;
4488
4489 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4490 if (addrconf_finite_timeout(timeout)) {
4491 expires = jiffies_to_clock_t(timeout * HZ);
4492 valid_lft = timeout;
4493 flags = RTF_EXPIRES;
4494 } else {
4495 expires = 0;
4496 flags = 0;
4497 ifa_flags |= IFA_F_PERMANENT;
4498 }
4499
4500 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4501 if (addrconf_finite_timeout(timeout)) {
4502 if (timeout == 0)
4503 ifa_flags |= IFA_F_DEPRECATED;
4504 prefered_lft = timeout;
4505 }
4506
4507 spin_lock_bh(&ifp->lock);
4508 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4509 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4510 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4511 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4512 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4513 IFA_F_NOPREFIXROUTE);
4514 ifp->flags |= ifa_flags;
4515 ifp->tstamp = jiffies;
4516 ifp->valid_lft = valid_lft;
4517 ifp->prefered_lft = prefered_lft;
4518
4519 spin_unlock_bh(&ifp->lock);
4520 if (!(ifp->flags&IFA_F_TENTATIVE))
4521 ipv6_ifa_notify(0, ifp);
4522
4523 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4524 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4525 expires, flags);
4526 } else if (had_prefixroute) {
4527 enum cleanup_prefix_rt_t action;
4528 unsigned long rt_expires;
4529
4530 write_lock_bh(&ifp->idev->lock);
4531 action = check_cleanup_prefix_route(ifp, &rt_expires);
4532 write_unlock_bh(&ifp->idev->lock);
4533
4534 if (action != CLEANUP_PREFIX_RT_NOP) {
4535 cleanup_prefix_route(ifp, rt_expires,
4536 action == CLEANUP_PREFIX_RT_DEL);
4537 }
4538 }
4539
4540 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4541 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4542 valid_lft = prefered_lft = 0;
4543 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4544 !was_managetempaddr, jiffies);
4545 }
4546
4547 addrconf_verify_rtnl();
4548
4549 return 0;
4550 }
4551
4552 static int
4553 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4554 struct netlink_ext_ack *extack)
4555 {
4556 struct net *net = sock_net(skb->sk);
4557 struct ifaddrmsg *ifm;
4558 struct nlattr *tb[IFA_MAX+1];
4559 struct in6_addr *pfx, *peer_pfx;
4560 struct inet6_ifaddr *ifa;
4561 struct net_device *dev;
4562 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4563 u32 ifa_flags;
4564 int err;
4565
4566 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4567 extack);
4568 if (err < 0)
4569 return err;
4570
4571 ifm = nlmsg_data(nlh);
4572 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4573 if (!pfx)
4574 return -EINVAL;
4575
4576 if (tb[IFA_CACHEINFO]) {
4577 struct ifa_cacheinfo *ci;
4578
4579 ci = nla_data(tb[IFA_CACHEINFO]);
4580 valid_lft = ci->ifa_valid;
4581 preferred_lft = ci->ifa_prefered;
4582 } else {
4583 preferred_lft = INFINITY_LIFE_TIME;
4584 valid_lft = INFINITY_LIFE_TIME;
4585 }
4586
4587 dev = __dev_get_by_index(net, ifm->ifa_index);
4588 if (!dev)
4589 return -ENODEV;
4590
4591 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4592
4593 /* We ignore other flags so far. */
4594 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4595 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4596
4597 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4598 if (!ifa) {
4599 /*
4600 * It would be best to check for !NLM_F_CREATE here but
4601 * userspace already relies on not having to provide this.
4602 */
4603 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4604 ifm->ifa_prefixlen, ifa_flags,
4605 preferred_lft, valid_lft);
4606 }
4607
4608 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4609 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4610 err = -EEXIST;
4611 else
4612 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4613
4614 in6_ifa_put(ifa);
4615
4616 return err;
4617 }
4618
4619 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4620 u8 scope, int ifindex)
4621 {
4622 struct ifaddrmsg *ifm;
4623
4624 ifm = nlmsg_data(nlh);
4625 ifm->ifa_family = AF_INET6;
4626 ifm->ifa_prefixlen = prefixlen;
4627 ifm->ifa_flags = flags;
4628 ifm->ifa_scope = scope;
4629 ifm->ifa_index = ifindex;
4630 }
4631
4632 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4633 unsigned long tstamp, u32 preferred, u32 valid)
4634 {
4635 struct ifa_cacheinfo ci;
4636
4637 ci.cstamp = cstamp_delta(cstamp);
4638 ci.tstamp = cstamp_delta(tstamp);
4639 ci.ifa_prefered = preferred;
4640 ci.ifa_valid = valid;
4641
4642 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4643 }
4644
4645 static inline int rt_scope(int ifa_scope)
4646 {
4647 if (ifa_scope & IFA_HOST)
4648 return RT_SCOPE_HOST;
4649 else if (ifa_scope & IFA_LINK)
4650 return RT_SCOPE_LINK;
4651 else if (ifa_scope & IFA_SITE)
4652 return RT_SCOPE_SITE;
4653 else
4654 return RT_SCOPE_UNIVERSE;
4655 }
4656
4657 static inline int inet6_ifaddr_msgsize(void)
4658 {
4659 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4660 + nla_total_size(16) /* IFA_LOCAL */
4661 + nla_total_size(16) /* IFA_ADDRESS */
4662 + nla_total_size(sizeof(struct ifa_cacheinfo))
4663 + nla_total_size(4) /* IFA_FLAGS */;
4664 }
4665
4666 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4667 u32 portid, u32 seq, int event, unsigned int flags)
4668 {
4669 struct nlmsghdr *nlh;
4670 u32 preferred, valid;
4671
4672 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4673 if (!nlh)
4674 return -EMSGSIZE;
4675
4676 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4677 ifa->idev->dev->ifindex);
4678
4679 if (!((ifa->flags&IFA_F_PERMANENT) &&
4680 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4681 preferred = ifa->prefered_lft;
4682 valid = ifa->valid_lft;
4683 if (preferred != INFINITY_LIFE_TIME) {
4684 long tval = (jiffies - ifa->tstamp)/HZ;
4685 if (preferred > tval)
4686 preferred -= tval;
4687 else
4688 preferred = 0;
4689 if (valid != INFINITY_LIFE_TIME) {
4690 if (valid > tval)
4691 valid -= tval;
4692 else
4693 valid = 0;
4694 }
4695 }
4696 } else {
4697 preferred = INFINITY_LIFE_TIME;
4698 valid = INFINITY_LIFE_TIME;
4699 }
4700
4701 if (!ipv6_addr_any(&ifa->peer_addr)) {
4702 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4703 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4704 goto error;
4705 } else
4706 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4707 goto error;
4708
4709 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4710 goto error;
4711
4712 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4713 goto error;
4714
4715 nlmsg_end(skb, nlh);
4716 return 0;
4717
4718 error:
4719 nlmsg_cancel(skb, nlh);
4720 return -EMSGSIZE;
4721 }
4722
4723 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4724 u32 portid, u32 seq, int event, u16 flags)
4725 {
4726 struct nlmsghdr *nlh;
4727 u8 scope = RT_SCOPE_UNIVERSE;
4728 int ifindex = ifmca->idev->dev->ifindex;
4729
4730 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4731 scope = RT_SCOPE_SITE;
4732
4733 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4734 if (!nlh)
4735 return -EMSGSIZE;
4736
4737 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4738 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4739 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4740 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4741 nlmsg_cancel(skb, nlh);
4742 return -EMSGSIZE;
4743 }
4744
4745 nlmsg_end(skb, nlh);
4746 return 0;
4747 }
4748
4749 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4750 u32 portid, u32 seq, int event, unsigned int flags)
4751 {
4752 struct nlmsghdr *nlh;
4753 u8 scope = RT_SCOPE_UNIVERSE;
4754 int ifindex = ifaca->aca_idev->dev->ifindex;
4755
4756 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4757 scope = RT_SCOPE_SITE;
4758
4759 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4760 if (!nlh)
4761 return -EMSGSIZE;
4762
4763 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4764 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4765 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4766 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4767 nlmsg_cancel(skb, nlh);
4768 return -EMSGSIZE;
4769 }
4770
4771 nlmsg_end(skb, nlh);
4772 return 0;
4773 }
4774
4775 enum addr_type_t {
4776 UNICAST_ADDR,
4777 MULTICAST_ADDR,
4778 ANYCAST_ADDR,
4779 };
4780
4781 /* called with rcu_read_lock() */
4782 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4783 struct netlink_callback *cb, enum addr_type_t type,
4784 int s_ip_idx, int *p_ip_idx)
4785 {
4786 struct ifmcaddr6 *ifmca;
4787 struct ifacaddr6 *ifaca;
4788 int err = 1;
4789 int ip_idx = *p_ip_idx;
4790
4791 read_lock_bh(&idev->lock);
4792 switch (type) {
4793 case UNICAST_ADDR: {
4794 struct inet6_ifaddr *ifa;
4795
4796 /* unicast address incl. temp addr */
4797 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4798 if (++ip_idx < s_ip_idx)
4799 continue;
4800 err = inet6_fill_ifaddr(skb, ifa,
4801 NETLINK_CB(cb->skb).portid,
4802 cb->nlh->nlmsg_seq,
4803 RTM_NEWADDR,
4804 NLM_F_MULTI);
4805 if (err < 0)
4806 break;
4807 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4808 }
4809 break;
4810 }
4811 case MULTICAST_ADDR:
4812 /* multicast address */
4813 for (ifmca = idev->mc_list; ifmca;
4814 ifmca = ifmca->next, ip_idx++) {
4815 if (ip_idx < s_ip_idx)
4816 continue;
4817 err = inet6_fill_ifmcaddr(skb, ifmca,
4818 NETLINK_CB(cb->skb).portid,
4819 cb->nlh->nlmsg_seq,
4820 RTM_GETMULTICAST,
4821 NLM_F_MULTI);
4822 if (err < 0)
4823 break;
4824 }
4825 break;
4826 case ANYCAST_ADDR:
4827 /* anycast address */
4828 for (ifaca = idev->ac_list; ifaca;
4829 ifaca = ifaca->aca_next, ip_idx++) {
4830 if (ip_idx < s_ip_idx)
4831 continue;
4832 err = inet6_fill_ifacaddr(skb, ifaca,
4833 NETLINK_CB(cb->skb).portid,
4834 cb->nlh->nlmsg_seq,
4835 RTM_GETANYCAST,
4836 NLM_F_MULTI);
4837 if (err < 0)
4838 break;
4839 }
4840 break;
4841 default:
4842 break;
4843 }
4844 read_unlock_bh(&idev->lock);
4845 *p_ip_idx = ip_idx;
4846 return err;
4847 }
4848
4849 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4850 enum addr_type_t type)
4851 {
4852 struct net *net = sock_net(skb->sk);
4853 int h, s_h;
4854 int idx, ip_idx;
4855 int s_idx, s_ip_idx;
4856 struct net_device *dev;
4857 struct inet6_dev *idev;
4858 struct hlist_head *head;
4859
4860 s_h = cb->args[0];
4861 s_idx = idx = cb->args[1];
4862 s_ip_idx = ip_idx = cb->args[2];
4863
4864 rcu_read_lock();
4865 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4866 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4867 idx = 0;
4868 head = &net->dev_index_head[h];
4869 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4870 if (idx < s_idx)
4871 goto cont;
4872 if (h > s_h || idx > s_idx)
4873 s_ip_idx = 0;
4874 ip_idx = 0;
4875 idev = __in6_dev_get(dev);
4876 if (!idev)
4877 goto cont;
4878
4879 if (in6_dump_addrs(idev, skb, cb, type,
4880 s_ip_idx, &ip_idx) < 0)
4881 goto done;
4882 cont:
4883 idx++;
4884 }
4885 }
4886 done:
4887 rcu_read_unlock();
4888 cb->args[0] = h;
4889 cb->args[1] = idx;
4890 cb->args[2] = ip_idx;
4891
4892 return skb->len;
4893 }
4894
4895 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4896 {
4897 enum addr_type_t type = UNICAST_ADDR;
4898
4899 return inet6_dump_addr(skb, cb, type);
4900 }
4901
4902 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4903 {
4904 enum addr_type_t type = MULTICAST_ADDR;
4905
4906 return inet6_dump_addr(skb, cb, type);
4907 }
4908
4909
4910 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4911 {
4912 enum addr_type_t type = ANYCAST_ADDR;
4913
4914 return inet6_dump_addr(skb, cb, type);
4915 }
4916
4917 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4918 struct netlink_ext_ack *extack)
4919 {
4920 struct net *net = sock_net(in_skb->sk);
4921 struct ifaddrmsg *ifm;
4922 struct nlattr *tb[IFA_MAX+1];
4923 struct in6_addr *addr = NULL, *peer;
4924 struct net_device *dev = NULL;
4925 struct inet6_ifaddr *ifa;
4926 struct sk_buff *skb;
4927 int err;
4928
4929 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4930 extack);
4931 if (err < 0)
4932 goto errout;
4933
4934 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4935 if (!addr) {
4936 err = -EINVAL;
4937 goto errout;
4938 }
4939
4940 ifm = nlmsg_data(nlh);
4941 if (ifm->ifa_index)
4942 dev = __dev_get_by_index(net, ifm->ifa_index);
4943
4944 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4945 if (!ifa) {
4946 err = -EADDRNOTAVAIL;
4947 goto errout;
4948 }
4949
4950 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4951 if (!skb) {
4952 err = -ENOBUFS;
4953 goto errout_ifa;
4954 }
4955
4956 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4957 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4958 if (err < 0) {
4959 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4960 WARN_ON(err == -EMSGSIZE);
4961 kfree_skb(skb);
4962 goto errout_ifa;
4963 }
4964 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4965 errout_ifa:
4966 in6_ifa_put(ifa);
4967 errout:
4968 return err;
4969 }
4970
4971 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4972 {
4973 struct sk_buff *skb;
4974 struct net *net = dev_net(ifa->idev->dev);
4975 int err = -ENOBUFS;
4976
4977 /* Don't send DELADDR notification for TENTATIVE address,
4978 * since NEWADDR notification is sent only after removing
4979 * TENTATIVE flag, if DAD has not failed.
4980 */
4981 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) &&
4982 event == RTM_DELADDR)
4983 return;
4984
4985 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4986 if (!skb)
4987 goto errout;
4988
4989 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4990 if (err < 0) {
4991 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4992 WARN_ON(err == -EMSGSIZE);
4993 kfree_skb(skb);
4994 goto errout;
4995 }
4996 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4997 return;
4998 errout:
4999 if (err < 0)
5000 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5001 }
5002
5003 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5004 __s32 *array, int bytes)
5005 {
5006 BUG_ON(bytes < (DEVCONF_MAX * 4));
5007
5008 memset(array, 0, bytes);
5009 array[DEVCONF_FORWARDING] = cnf->forwarding;
5010 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5011 array[DEVCONF_MTU6] = cnf->mtu6;
5012 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5013 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5014 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5015 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5016 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5017 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5018 jiffies_to_msecs(cnf->rtr_solicit_interval);
5019 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5020 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5021 array[DEVCONF_RTR_SOLICIT_DELAY] =
5022 jiffies_to_msecs(cnf->rtr_solicit_delay);
5023 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5024 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5025 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5026 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5027 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5028 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5029 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5030 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5031 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5032 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5033 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5034 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5035 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5036 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5037 #ifdef CONFIG_IPV6_ROUTER_PREF
5038 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5039 array[DEVCONF_RTR_PROBE_INTERVAL] =
5040 jiffies_to_msecs(cnf->rtr_probe_interval);
5041 #ifdef CONFIG_IPV6_ROUTE_INFO
5042 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5043 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5044 #endif
5045 #endif
5046 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5047 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5048 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5049 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5050 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5051 #endif
5052 #ifdef CONFIG_IPV6_MROUTE
5053 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5054 #endif
5055 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5056 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5057 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5058 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5059 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5060 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5061 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5062 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5063 /* we omit DEVCONF_STABLE_SECRET for now */
5064 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5065 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5066 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5067 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5068 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5069 #ifdef CONFIG_IPV6_SEG6_HMAC
5070 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5071 #endif
5072 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5073 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5074 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5075 }
5076
5077 static inline size_t inet6_ifla6_size(void)
5078 {
5079 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5080 + nla_total_size(sizeof(struct ifla_cacheinfo))
5081 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5082 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5083 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5084 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5085 }
5086
5087 static inline size_t inet6_if_nlmsg_size(void)
5088 {
5089 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5090 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5091 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5092 + nla_total_size(4) /* IFLA_MTU */
5093 + nla_total_size(4) /* IFLA_LINK */
5094 + nla_total_size(1) /* IFLA_OPERSTATE */
5095 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5096 }
5097
5098 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5099 int bytes)
5100 {
5101 int i;
5102 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5103 BUG_ON(pad < 0);
5104
5105 /* Use put_unaligned() because stats may not be aligned for u64. */
5106 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5107 for (i = 1; i < ICMP6_MIB_MAX; i++)
5108 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5109
5110 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5111 }
5112
5113 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5114 int bytes, size_t syncpoff)
5115 {
5116 int i, c;
5117 u64 buff[IPSTATS_MIB_MAX];
5118 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5119
5120 BUG_ON(pad < 0);
5121
5122 memset(buff, 0, sizeof(buff));
5123 buff[0] = IPSTATS_MIB_MAX;
5124
5125 for_each_possible_cpu(c) {
5126 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5127 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5128 }
5129
5130 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5131 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5132 }
5133
5134 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5135 int bytes)
5136 {
5137 switch (attrtype) {
5138 case IFLA_INET6_STATS:
5139 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5140 offsetof(struct ipstats_mib, syncp));
5141 break;
5142 case IFLA_INET6_ICMP6STATS:
5143 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5144 break;
5145 }
5146 }
5147
5148 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5149 u32 ext_filter_mask)
5150 {
5151 struct nlattr *nla;
5152 struct ifla_cacheinfo ci;
5153
5154 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5155 goto nla_put_failure;
5156 ci.max_reasm_len = IPV6_MAXPLEN;
5157 ci.tstamp = cstamp_delta(idev->tstamp);
5158 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5159 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5160 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5161 goto nla_put_failure;
5162 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5163 if (!nla)
5164 goto nla_put_failure;
5165 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5166
5167 /* XXX - MC not implemented */
5168
5169 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5170 return 0;
5171
5172 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5173 if (!nla)
5174 goto nla_put_failure;
5175 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5176
5177 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5178 if (!nla)
5179 goto nla_put_failure;
5180 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5181
5182 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5183 if (!nla)
5184 goto nla_put_failure;
5185
5186 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5187 goto nla_put_failure;
5188
5189 read_lock_bh(&idev->lock);
5190 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5191 read_unlock_bh(&idev->lock);
5192
5193 return 0;
5194
5195 nla_put_failure:
5196 return -EMSGSIZE;
5197 }
5198
5199 static size_t inet6_get_link_af_size(const struct net_device *dev,
5200 u32 ext_filter_mask)
5201 {
5202 if (!__in6_dev_get(dev))
5203 return 0;
5204
5205 return inet6_ifla6_size();
5206 }
5207
5208 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5209 u32 ext_filter_mask)
5210 {
5211 struct inet6_dev *idev = __in6_dev_get(dev);
5212
5213 if (!idev)
5214 return -ENODATA;
5215
5216 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5217 return -EMSGSIZE;
5218
5219 return 0;
5220 }
5221
5222 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5223 {
5224 struct inet6_ifaddr *ifp;
5225 struct net_device *dev = idev->dev;
5226 bool clear_token, update_rs = false;
5227 struct in6_addr ll_addr;
5228
5229 ASSERT_RTNL();
5230
5231 if (!token)
5232 return -EINVAL;
5233 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5234 return -EINVAL;
5235 if (!ipv6_accept_ra(idev))
5236 return -EINVAL;
5237 if (idev->cnf.rtr_solicits == 0)
5238 return -EINVAL;
5239
5240 write_lock_bh(&idev->lock);
5241
5242 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5243 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5244
5245 write_unlock_bh(&idev->lock);
5246
5247 clear_token = ipv6_addr_any(token);
5248 if (clear_token)
5249 goto update_lft;
5250
5251 if (!idev->dead && (idev->if_flags & IF_READY) &&
5252 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5253 IFA_F_OPTIMISTIC)) {
5254 /* If we're not ready, then normal ifup will take care
5255 * of this. Otherwise, we need to request our rs here.
5256 */
5257 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5258 update_rs = true;
5259 }
5260
5261 update_lft:
5262 write_lock_bh(&idev->lock);
5263
5264 if (update_rs) {
5265 idev->if_flags |= IF_RS_SENT;
5266 idev->rs_interval = rfc3315_s14_backoff_init(
5267 idev->cnf.rtr_solicit_interval);
5268 idev->rs_probes = 1;
5269 addrconf_mod_rs_timer(idev, idev->rs_interval);
5270 }
5271
5272 /* Well, that's kinda nasty ... */
5273 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5274 spin_lock(&ifp->lock);
5275 if (ifp->tokenized) {
5276 ifp->valid_lft = 0;
5277 ifp->prefered_lft = 0;
5278 }
5279 spin_unlock(&ifp->lock);
5280 }
5281
5282 write_unlock_bh(&idev->lock);
5283 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5284 addrconf_verify_rtnl();
5285 return 0;
5286 }
5287
5288 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5289 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5290 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5291 };
5292
5293 static int inet6_validate_link_af(const struct net_device *dev,
5294 const struct nlattr *nla)
5295 {
5296 struct nlattr *tb[IFLA_INET6_MAX + 1];
5297
5298 if (dev && !__in6_dev_get(dev))
5299 return -EAFNOSUPPORT;
5300
5301 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5302 NULL);
5303 }
5304
5305 static int check_addr_gen_mode(int mode)
5306 {
5307 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5308 mode != IN6_ADDR_GEN_MODE_NONE &&
5309 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5310 mode != IN6_ADDR_GEN_MODE_RANDOM)
5311 return -EINVAL;
5312 return 1;
5313 }
5314
5315 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5316 int mode)
5317 {
5318 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5319 !idev->cnf.stable_secret.initialized &&
5320 !net->ipv6.devconf_dflt->stable_secret.initialized)
5321 return -EINVAL;
5322 return 1;
5323 }
5324
5325 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5326 {
5327 int err = -EINVAL;
5328 struct inet6_dev *idev = __in6_dev_get(dev);
5329 struct nlattr *tb[IFLA_INET6_MAX + 1];
5330
5331 if (!idev)
5332 return -EAFNOSUPPORT;
5333
5334 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5335 BUG();
5336
5337 if (tb[IFLA_INET6_TOKEN]) {
5338 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5339 if (err)
5340 return err;
5341 }
5342
5343 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5344 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5345
5346 if (check_addr_gen_mode(mode) < 0 ||
5347 check_stable_privacy(idev, dev_net(dev), mode) < 0)
5348 return -EINVAL;
5349
5350 idev->cnf.addr_gen_mode = mode;
5351 err = 0;
5352 }
5353
5354 return err;
5355 }
5356
5357 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5358 u32 portid, u32 seq, int event, unsigned int flags)
5359 {
5360 struct net_device *dev = idev->dev;
5361 struct ifinfomsg *hdr;
5362 struct nlmsghdr *nlh;
5363 void *protoinfo;
5364
5365 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5366 if (!nlh)
5367 return -EMSGSIZE;
5368
5369 hdr = nlmsg_data(nlh);
5370 hdr->ifi_family = AF_INET6;
5371 hdr->__ifi_pad = 0;
5372 hdr->ifi_type = dev->type;
5373 hdr->ifi_index = dev->ifindex;
5374 hdr->ifi_flags = dev_get_flags(dev);
5375 hdr->ifi_change = 0;
5376
5377 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5378 (dev->addr_len &&
5379 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5380 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5381 (dev->ifindex != dev_get_iflink(dev) &&
5382 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5383 nla_put_u8(skb, IFLA_OPERSTATE,
5384 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5385 goto nla_put_failure;
5386 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5387 if (!protoinfo)
5388 goto nla_put_failure;
5389
5390 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5391 goto nla_put_failure;
5392
5393 nla_nest_end(skb, protoinfo);
5394 nlmsg_end(skb, nlh);
5395 return 0;
5396
5397 nla_put_failure:
5398 nlmsg_cancel(skb, nlh);
5399 return -EMSGSIZE;
5400 }
5401
5402 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5403 {
5404 struct net *net = sock_net(skb->sk);
5405 int h, s_h;
5406 int idx = 0, s_idx;
5407 struct net_device *dev;
5408 struct inet6_dev *idev;
5409 struct hlist_head *head;
5410
5411 s_h = cb->args[0];
5412 s_idx = cb->args[1];
5413
5414 rcu_read_lock();
5415 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5416 idx = 0;
5417 head = &net->dev_index_head[h];
5418 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5419 if (idx < s_idx)
5420 goto cont;
5421 idev = __in6_dev_get(dev);
5422 if (!idev)
5423 goto cont;
5424 if (inet6_fill_ifinfo(skb, idev,
5425 NETLINK_CB(cb->skb).portid,
5426 cb->nlh->nlmsg_seq,
5427 RTM_NEWLINK, NLM_F_MULTI) < 0)
5428 goto out;
5429 cont:
5430 idx++;
5431 }
5432 }
5433 out:
5434 rcu_read_unlock();
5435 cb->args[1] = idx;
5436 cb->args[0] = h;
5437
5438 return skb->len;
5439 }
5440
5441 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5442 {
5443 struct sk_buff *skb;
5444 struct net *net = dev_net(idev->dev);
5445 int err = -ENOBUFS;
5446
5447 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5448 if (!skb)
5449 goto errout;
5450
5451 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5452 if (err < 0) {
5453 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5454 WARN_ON(err == -EMSGSIZE);
5455 kfree_skb(skb);
5456 goto errout;
5457 }
5458 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5459 return;
5460 errout:
5461 if (err < 0)
5462 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5463 }
5464
5465 static inline size_t inet6_prefix_nlmsg_size(void)
5466 {
5467 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5468 + nla_total_size(sizeof(struct in6_addr))
5469 + nla_total_size(sizeof(struct prefix_cacheinfo));
5470 }
5471
5472 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5473 struct prefix_info *pinfo, u32 portid, u32 seq,
5474 int event, unsigned int flags)
5475 {
5476 struct prefixmsg *pmsg;
5477 struct nlmsghdr *nlh;
5478 struct prefix_cacheinfo ci;
5479
5480 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5481 if (!nlh)
5482 return -EMSGSIZE;
5483
5484 pmsg = nlmsg_data(nlh);
5485 pmsg->prefix_family = AF_INET6;
5486 pmsg->prefix_pad1 = 0;
5487 pmsg->prefix_pad2 = 0;
5488 pmsg->prefix_ifindex = idev->dev->ifindex;
5489 pmsg->prefix_len = pinfo->prefix_len;
5490 pmsg->prefix_type = pinfo->type;
5491 pmsg->prefix_pad3 = 0;
5492 pmsg->prefix_flags = 0;
5493 if (pinfo->onlink)
5494 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5495 if (pinfo->autoconf)
5496 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5497
5498 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5499 goto nla_put_failure;
5500 ci.preferred_time = ntohl(pinfo->prefered);
5501 ci.valid_time = ntohl(pinfo->valid);
5502 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5503 goto nla_put_failure;
5504 nlmsg_end(skb, nlh);
5505 return 0;
5506
5507 nla_put_failure:
5508 nlmsg_cancel(skb, nlh);
5509 return -EMSGSIZE;
5510 }
5511
5512 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5513 struct prefix_info *pinfo)
5514 {
5515 struct sk_buff *skb;
5516 struct net *net = dev_net(idev->dev);
5517 int err = -ENOBUFS;
5518
5519 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5520 if (!skb)
5521 goto errout;
5522
5523 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5524 if (err < 0) {
5525 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5526 WARN_ON(err == -EMSGSIZE);
5527 kfree_skb(skb);
5528 goto errout;
5529 }
5530 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5531 return;
5532 errout:
5533 if (err < 0)
5534 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5535 }
5536
5537 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5538 {
5539 struct net *net = dev_net(ifp->idev->dev);
5540
5541 if (event)
5542 ASSERT_RTNL();
5543
5544 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5545
5546 switch (event) {
5547 case RTM_NEWADDR:
5548 /*
5549 * If the address was optimistic
5550 * we inserted the route at the start of
5551 * our DAD process, so we don't need
5552 * to do it again
5553 */
5554 if (!rcu_access_pointer(ifp->rt->rt6i_node))
5555 ip6_ins_rt(ifp->rt);
5556 if (ifp->idev->cnf.forwarding)
5557 addrconf_join_anycast(ifp);
5558 if (!ipv6_addr_any(&ifp->peer_addr))
5559 addrconf_prefix_route(&ifp->peer_addr, 128,
5560 ifp->idev->dev, 0, 0);
5561 break;
5562 case RTM_DELADDR:
5563 if (ifp->idev->cnf.forwarding)
5564 addrconf_leave_anycast(ifp);
5565 addrconf_leave_solict(ifp->idev, &ifp->addr);
5566 if (!ipv6_addr_any(&ifp->peer_addr)) {
5567 struct rt6_info *rt;
5568
5569 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5570 ifp->idev->dev, 0, 0);
5571 if (rt)
5572 ip6_del_rt(rt);
5573 }
5574 if (ifp->rt) {
5575 if (dst_hold_safe(&ifp->rt->dst))
5576 ip6_del_rt(ifp->rt);
5577 }
5578 rt_genid_bump_ipv6(net);
5579 break;
5580 }
5581 atomic_inc(&net->ipv6.dev_addr_genid);
5582 }
5583
5584 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5585 {
5586 rcu_read_lock_bh();
5587 if (likely(ifp->idev->dead == 0))
5588 __ipv6_ifa_notify(event, ifp);
5589 rcu_read_unlock_bh();
5590 }
5591
5592 #ifdef CONFIG_SYSCTL
5593
5594 static
5595 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5596 void __user *buffer, size_t *lenp, loff_t *ppos)
5597 {
5598 int *valp = ctl->data;
5599 int val = *valp;
5600 loff_t pos = *ppos;
5601 struct ctl_table lctl;
5602 int ret;
5603
5604 /*
5605 * ctl->data points to idev->cnf.forwarding, we should
5606 * not modify it until we get the rtnl lock.
5607 */
5608 lctl = *ctl;
5609 lctl.data = &val;
5610
5611 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5612
5613 if (write)
5614 ret = addrconf_fixup_forwarding(ctl, valp, val);
5615 if (ret)
5616 *ppos = pos;
5617 return ret;
5618 }
5619
5620 static
5621 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5622 void __user *buffer, size_t *lenp, loff_t *ppos)
5623 {
5624 struct inet6_dev *idev = ctl->extra1;
5625 int min_mtu = IPV6_MIN_MTU;
5626 struct ctl_table lctl;
5627
5628 lctl = *ctl;
5629 lctl.extra1 = &min_mtu;
5630 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5631
5632 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5633 }
5634
5635 static void dev_disable_change(struct inet6_dev *idev)
5636 {
5637 struct netdev_notifier_info info;
5638
5639 if (!idev || !idev->dev)
5640 return;
5641
5642 netdev_notifier_info_init(&info, idev->dev);
5643 if (idev->cnf.disable_ipv6)
5644 addrconf_notify(NULL, NETDEV_DOWN, &info);
5645 else
5646 addrconf_notify(NULL, NETDEV_UP, &info);
5647 }
5648
5649 static void addrconf_disable_change(struct net *net, __s32 newf)
5650 {
5651 struct net_device *dev;
5652 struct inet6_dev *idev;
5653
5654 for_each_netdev(net, dev) {
5655 idev = __in6_dev_get(dev);
5656 if (idev) {
5657 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5658 idev->cnf.disable_ipv6 = newf;
5659 if (changed)
5660 dev_disable_change(idev);
5661 }
5662 }
5663 }
5664
5665 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5666 {
5667 struct net *net;
5668 int old;
5669
5670 if (!rtnl_trylock())
5671 return restart_syscall();
5672
5673 net = (struct net *)table->extra2;
5674 old = *p;
5675 *p = newf;
5676
5677 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5678 rtnl_unlock();
5679 return 0;
5680 }
5681
5682 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5683 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5684 addrconf_disable_change(net, newf);
5685 } else if ((!newf) ^ (!old))
5686 dev_disable_change((struct inet6_dev *)table->extra1);
5687
5688 rtnl_unlock();
5689 return 0;
5690 }
5691
5692 static
5693 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5694 void __user *buffer, size_t *lenp, loff_t *ppos)
5695 {
5696 int *valp = ctl->data;
5697 int val = *valp;
5698 loff_t pos = *ppos;
5699 struct ctl_table lctl;
5700 int ret;
5701
5702 /*
5703 * ctl->data points to idev->cnf.disable_ipv6, we should
5704 * not modify it until we get the rtnl lock.
5705 */
5706 lctl = *ctl;
5707 lctl.data = &val;
5708
5709 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5710
5711 if (write)
5712 ret = addrconf_disable_ipv6(ctl, valp, val);
5713 if (ret)
5714 *ppos = pos;
5715 return ret;
5716 }
5717
5718 static
5719 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5720 void __user *buffer, size_t *lenp, loff_t *ppos)
5721 {
5722 int *valp = ctl->data;
5723 int ret;
5724 int old, new;
5725
5726 old = *valp;
5727 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5728 new = *valp;
5729
5730 if (write && old != new) {
5731 struct net *net = ctl->extra2;
5732
5733 if (!rtnl_trylock())
5734 return restart_syscall();
5735
5736 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5737 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5738 NETCONFA_PROXY_NEIGH,
5739 NETCONFA_IFINDEX_DEFAULT,
5740 net->ipv6.devconf_dflt);
5741 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5742 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5743 NETCONFA_PROXY_NEIGH,
5744 NETCONFA_IFINDEX_ALL,
5745 net->ipv6.devconf_all);
5746 else {
5747 struct inet6_dev *idev = ctl->extra1;
5748
5749 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5750 NETCONFA_PROXY_NEIGH,
5751 idev->dev->ifindex,
5752 &idev->cnf);
5753 }
5754 rtnl_unlock();
5755 }
5756
5757 return ret;
5758 }
5759
5760 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5761 void __user *buffer, size_t *lenp,
5762 loff_t *ppos)
5763 {
5764 int ret = 0;
5765 int new_val;
5766 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5767 struct net *net = (struct net *)ctl->extra2;
5768
5769 if (!rtnl_trylock())
5770 return restart_syscall();
5771
5772 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5773
5774 if (write) {
5775 new_val = *((int *)ctl->data);
5776
5777 if (check_addr_gen_mode(new_val) < 0) {
5778 ret = -EINVAL;
5779 goto out;
5780 }
5781
5782 /* request for default */
5783 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5784 ipv6_devconf_dflt.addr_gen_mode = new_val;
5785
5786 /* request for individual net device */
5787 } else {
5788 if (!idev)
5789 goto out;
5790
5791 if (check_stable_privacy(idev, net, new_val) < 0) {
5792 ret = -EINVAL;
5793 goto out;
5794 }
5795
5796 if (idev->cnf.addr_gen_mode != new_val) {
5797 idev->cnf.addr_gen_mode = new_val;
5798 addrconf_dev_config(idev->dev);
5799 }
5800 }
5801 }
5802
5803 out:
5804 rtnl_unlock();
5805
5806 return ret;
5807 }
5808
5809 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5810 void __user *buffer, size_t *lenp,
5811 loff_t *ppos)
5812 {
5813 int err;
5814 struct in6_addr addr;
5815 char str[IPV6_MAX_STRLEN];
5816 struct ctl_table lctl = *ctl;
5817 struct net *net = ctl->extra2;
5818 struct ipv6_stable_secret *secret = ctl->data;
5819
5820 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5821 return -EIO;
5822
5823 lctl.maxlen = IPV6_MAX_STRLEN;
5824 lctl.data = str;
5825
5826 if (!rtnl_trylock())
5827 return restart_syscall();
5828
5829 if (!write && !secret->initialized) {
5830 err = -EIO;
5831 goto out;
5832 }
5833
5834 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5835 if (err >= sizeof(str)) {
5836 err = -EIO;
5837 goto out;
5838 }
5839
5840 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5841 if (err || !write)
5842 goto out;
5843
5844 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5845 err = -EIO;
5846 goto out;
5847 }
5848
5849 secret->initialized = true;
5850 secret->secret = addr;
5851
5852 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5853 struct net_device *dev;
5854
5855 for_each_netdev(net, dev) {
5856 struct inet6_dev *idev = __in6_dev_get(dev);
5857
5858 if (idev) {
5859 idev->cnf.addr_gen_mode =
5860 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5861 }
5862 }
5863 } else {
5864 struct inet6_dev *idev = ctl->extra1;
5865
5866 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5867 }
5868
5869 out:
5870 rtnl_unlock();
5871
5872 return err;
5873 }
5874
5875 static
5876 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5877 int write,
5878 void __user *buffer,
5879 size_t *lenp,
5880 loff_t *ppos)
5881 {
5882 int *valp = ctl->data;
5883 int val = *valp;
5884 loff_t pos = *ppos;
5885 struct ctl_table lctl;
5886 int ret;
5887
5888 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5889 * we should not modify it until we get the rtnl lock.
5890 */
5891 lctl = *ctl;
5892 lctl.data = &val;
5893
5894 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5895
5896 if (write)
5897 ret = addrconf_fixup_linkdown(ctl, valp, val);
5898 if (ret)
5899 *ppos = pos;
5900 return ret;
5901 }
5902
5903 static
5904 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5905 {
5906 if (rt) {
5907 if (action)
5908 rt->dst.flags |= DST_NOPOLICY;
5909 else
5910 rt->dst.flags &= ~DST_NOPOLICY;
5911 }
5912 }
5913
5914 static
5915 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5916 {
5917 struct inet6_ifaddr *ifa;
5918
5919 read_lock_bh(&idev->lock);
5920 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5921 spin_lock(&ifa->lock);
5922 if (ifa->rt) {
5923 struct rt6_info *rt = ifa->rt;
5924 struct fib6_table *table = rt->rt6i_table;
5925 int cpu;
5926
5927 read_lock(&table->tb6_lock);
5928 addrconf_set_nopolicy(ifa->rt, val);
5929 if (rt->rt6i_pcpu) {
5930 for_each_possible_cpu(cpu) {
5931 struct rt6_info **rtp;
5932
5933 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5934 addrconf_set_nopolicy(*rtp, val);
5935 }
5936 }
5937 read_unlock(&table->tb6_lock);
5938 }
5939 spin_unlock(&ifa->lock);
5940 }
5941 read_unlock_bh(&idev->lock);
5942 }
5943
5944 static
5945 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5946 {
5947 struct inet6_dev *idev;
5948 struct net *net;
5949
5950 if (!rtnl_trylock())
5951 return restart_syscall();
5952
5953 *valp = val;
5954
5955 net = (struct net *)ctl->extra2;
5956 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5957 rtnl_unlock();
5958 return 0;
5959 }
5960
5961 if (valp == &net->ipv6.devconf_all->disable_policy) {
5962 struct net_device *dev;
5963
5964 for_each_netdev(net, dev) {
5965 idev = __in6_dev_get(dev);
5966 if (idev)
5967 addrconf_disable_policy_idev(idev, val);
5968 }
5969 } else {
5970 idev = (struct inet6_dev *)ctl->extra1;
5971 addrconf_disable_policy_idev(idev, val);
5972 }
5973
5974 rtnl_unlock();
5975 return 0;
5976 }
5977
5978 static
5979 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5980 void __user *buffer, size_t *lenp,
5981 loff_t *ppos)
5982 {
5983 int *valp = ctl->data;
5984 int val = *valp;
5985 loff_t pos = *ppos;
5986 struct ctl_table lctl;
5987 int ret;
5988
5989 lctl = *ctl;
5990 lctl.data = &val;
5991 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5992
5993 if (write && (*valp != val))
5994 ret = addrconf_disable_policy(ctl, valp, val);
5995
5996 if (ret)
5997 *ppos = pos;
5998
5999 return ret;
6000 }
6001
6002 static int minus_one = -1;
6003 static const int one = 1;
6004 static const int two_five_five = 255;
6005
6006 static const struct ctl_table addrconf_sysctl[] = {
6007 {
6008 .procname = "forwarding",
6009 .data = &ipv6_devconf.forwarding,
6010 .maxlen = sizeof(int),
6011 .mode = 0644,
6012 .proc_handler = addrconf_sysctl_forward,
6013 },
6014 {
6015 .procname = "hop_limit",
6016 .data = &ipv6_devconf.hop_limit,
6017 .maxlen = sizeof(int),
6018 .mode = 0644,
6019 .proc_handler = proc_dointvec_minmax,
6020 .extra1 = (void *)&one,
6021 .extra2 = (void *)&two_five_five,
6022 },
6023 {
6024 .procname = "mtu",
6025 .data = &ipv6_devconf.mtu6,
6026 .maxlen = sizeof(int),
6027 .mode = 0644,
6028 .proc_handler = addrconf_sysctl_mtu,
6029 },
6030 {
6031 .procname = "accept_ra",
6032 .data = &ipv6_devconf.accept_ra,
6033 .maxlen = sizeof(int),
6034 .mode = 0644,
6035 .proc_handler = proc_dointvec,
6036 },
6037 {
6038 .procname = "accept_redirects",
6039 .data = &ipv6_devconf.accept_redirects,
6040 .maxlen = sizeof(int),
6041 .mode = 0644,
6042 .proc_handler = proc_dointvec,
6043 },
6044 {
6045 .procname = "autoconf",
6046 .data = &ipv6_devconf.autoconf,
6047 .maxlen = sizeof(int),
6048 .mode = 0644,
6049 .proc_handler = proc_dointvec,
6050 },
6051 {
6052 .procname = "dad_transmits",
6053 .data = &ipv6_devconf.dad_transmits,
6054 .maxlen = sizeof(int),
6055 .mode = 0644,
6056 .proc_handler = proc_dointvec,
6057 },
6058 {
6059 .procname = "router_solicitations",
6060 .data = &ipv6_devconf.rtr_solicits,
6061 .maxlen = sizeof(int),
6062 .mode = 0644,
6063 .proc_handler = proc_dointvec_minmax,
6064 .extra1 = &minus_one,
6065 },
6066 {
6067 .procname = "router_solicitation_interval",
6068 .data = &ipv6_devconf.rtr_solicit_interval,
6069 .maxlen = sizeof(int),
6070 .mode = 0644,
6071 .proc_handler = proc_dointvec_jiffies,
6072 },
6073 {
6074 .procname = "router_solicitation_max_interval",
6075 .data = &ipv6_devconf.rtr_solicit_max_interval,
6076 .maxlen = sizeof(int),
6077 .mode = 0644,
6078 .proc_handler = proc_dointvec_jiffies,
6079 },
6080 {
6081 .procname = "router_solicitation_delay",
6082 .data = &ipv6_devconf.rtr_solicit_delay,
6083 .maxlen = sizeof(int),
6084 .mode = 0644,
6085 .proc_handler = proc_dointvec_jiffies,
6086 },
6087 {
6088 .procname = "force_mld_version",
6089 .data = &ipv6_devconf.force_mld_version,
6090 .maxlen = sizeof(int),
6091 .mode = 0644,
6092 .proc_handler = proc_dointvec,
6093 },
6094 {
6095 .procname = "mldv1_unsolicited_report_interval",
6096 .data =
6097 &ipv6_devconf.mldv1_unsolicited_report_interval,
6098 .maxlen = sizeof(int),
6099 .mode = 0644,
6100 .proc_handler = proc_dointvec_ms_jiffies,
6101 },
6102 {
6103 .procname = "mldv2_unsolicited_report_interval",
6104 .data =
6105 &ipv6_devconf.mldv2_unsolicited_report_interval,
6106 .maxlen = sizeof(int),
6107 .mode = 0644,
6108 .proc_handler = proc_dointvec_ms_jiffies,
6109 },
6110 {
6111 .procname = "use_tempaddr",
6112 .data = &ipv6_devconf.use_tempaddr,
6113 .maxlen = sizeof(int),
6114 .mode = 0644,
6115 .proc_handler = proc_dointvec,
6116 },
6117 {
6118 .procname = "temp_valid_lft",
6119 .data = &ipv6_devconf.temp_valid_lft,
6120 .maxlen = sizeof(int),
6121 .mode = 0644,
6122 .proc_handler = proc_dointvec,
6123 },
6124 {
6125 .procname = "temp_prefered_lft",
6126 .data = &ipv6_devconf.temp_prefered_lft,
6127 .maxlen = sizeof(int),
6128 .mode = 0644,
6129 .proc_handler = proc_dointvec,
6130 },
6131 {
6132 .procname = "regen_max_retry",
6133 .data = &ipv6_devconf.regen_max_retry,
6134 .maxlen = sizeof(int),
6135 .mode = 0644,
6136 .proc_handler = proc_dointvec,
6137 },
6138 {
6139 .procname = "max_desync_factor",
6140 .data = &ipv6_devconf.max_desync_factor,
6141 .maxlen = sizeof(int),
6142 .mode = 0644,
6143 .proc_handler = proc_dointvec,
6144 },
6145 {
6146 .procname = "max_addresses",
6147 .data = &ipv6_devconf.max_addresses,
6148 .maxlen = sizeof(int),
6149 .mode = 0644,
6150 .proc_handler = proc_dointvec,
6151 },
6152 {
6153 .procname = "accept_ra_defrtr",
6154 .data = &ipv6_devconf.accept_ra_defrtr,
6155 .maxlen = sizeof(int),
6156 .mode = 0644,
6157 .proc_handler = proc_dointvec,
6158 },
6159 {
6160 .procname = "accept_ra_min_hop_limit",
6161 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6162 .maxlen = sizeof(int),
6163 .mode = 0644,
6164 .proc_handler = proc_dointvec,
6165 },
6166 {
6167 .procname = "accept_ra_pinfo",
6168 .data = &ipv6_devconf.accept_ra_pinfo,
6169 .maxlen = sizeof(int),
6170 .mode = 0644,
6171 .proc_handler = proc_dointvec,
6172 },
6173 #ifdef CONFIG_IPV6_ROUTER_PREF
6174 {
6175 .procname = "accept_ra_rtr_pref",
6176 .data = &ipv6_devconf.accept_ra_rtr_pref,
6177 .maxlen = sizeof(int),
6178 .mode = 0644,
6179 .proc_handler = proc_dointvec,
6180 },
6181 {
6182 .procname = "router_probe_interval",
6183 .data = &ipv6_devconf.rtr_probe_interval,
6184 .maxlen = sizeof(int),
6185 .mode = 0644,
6186 .proc_handler = proc_dointvec_jiffies,
6187 },
6188 #ifdef CONFIG_IPV6_ROUTE_INFO
6189 {
6190 .procname = "accept_ra_rt_info_min_plen",
6191 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6192 .maxlen = sizeof(int),
6193 .mode = 0644,
6194 .proc_handler = proc_dointvec,
6195 },
6196 {
6197 .procname = "accept_ra_rt_info_max_plen",
6198 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6199 .maxlen = sizeof(int),
6200 .mode = 0644,
6201 .proc_handler = proc_dointvec,
6202 },
6203 #endif
6204 #endif
6205 {
6206 .procname = "proxy_ndp",
6207 .data = &ipv6_devconf.proxy_ndp,
6208 .maxlen = sizeof(int),
6209 .mode = 0644,
6210 .proc_handler = addrconf_sysctl_proxy_ndp,
6211 },
6212 {
6213 .procname = "accept_source_route",
6214 .data = &ipv6_devconf.accept_source_route,
6215 .maxlen = sizeof(int),
6216 .mode = 0644,
6217 .proc_handler = proc_dointvec,
6218 },
6219 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6220 {
6221 .procname = "optimistic_dad",
6222 .data = &ipv6_devconf.optimistic_dad,
6223 .maxlen = sizeof(int),
6224 .mode = 0644,
6225 .proc_handler = proc_dointvec,
6226 },
6227 {
6228 .procname = "use_optimistic",
6229 .data = &ipv6_devconf.use_optimistic,
6230 .maxlen = sizeof(int),
6231 .mode = 0644,
6232 .proc_handler = proc_dointvec,
6233 },
6234 #endif
6235 #ifdef CONFIG_IPV6_MROUTE
6236 {
6237 .procname = "mc_forwarding",
6238 .data = &ipv6_devconf.mc_forwarding,
6239 .maxlen = sizeof(int),
6240 .mode = 0444,
6241 .proc_handler = proc_dointvec,
6242 },
6243 #endif
6244 {
6245 .procname = "disable_ipv6",
6246 .data = &ipv6_devconf.disable_ipv6,
6247 .maxlen = sizeof(int),
6248 .mode = 0644,
6249 .proc_handler = addrconf_sysctl_disable,
6250 },
6251 {
6252 .procname = "accept_dad",
6253 .data = &ipv6_devconf.accept_dad,
6254 .maxlen = sizeof(int),
6255 .mode = 0644,
6256 .proc_handler = proc_dointvec,
6257 },
6258 {
6259 .procname = "force_tllao",
6260 .data = &ipv6_devconf.force_tllao,
6261 .maxlen = sizeof(int),
6262 .mode = 0644,
6263 .proc_handler = proc_dointvec
6264 },
6265 {
6266 .procname = "ndisc_notify",
6267 .data = &ipv6_devconf.ndisc_notify,
6268 .maxlen = sizeof(int),
6269 .mode = 0644,
6270 .proc_handler = proc_dointvec
6271 },
6272 {
6273 .procname = "suppress_frag_ndisc",
6274 .data = &ipv6_devconf.suppress_frag_ndisc,
6275 .maxlen = sizeof(int),
6276 .mode = 0644,
6277 .proc_handler = proc_dointvec
6278 },
6279 {
6280 .procname = "accept_ra_from_local",
6281 .data = &ipv6_devconf.accept_ra_from_local,
6282 .maxlen = sizeof(int),
6283 .mode = 0644,
6284 .proc_handler = proc_dointvec,
6285 },
6286 {
6287 .procname = "accept_ra_mtu",
6288 .data = &ipv6_devconf.accept_ra_mtu,
6289 .maxlen = sizeof(int),
6290 .mode = 0644,
6291 .proc_handler = proc_dointvec,
6292 },
6293 {
6294 .procname = "stable_secret",
6295 .data = &ipv6_devconf.stable_secret,
6296 .maxlen = IPV6_MAX_STRLEN,
6297 .mode = 0600,
6298 .proc_handler = addrconf_sysctl_stable_secret,
6299 },
6300 {
6301 .procname = "use_oif_addrs_only",
6302 .data = &ipv6_devconf.use_oif_addrs_only,
6303 .maxlen = sizeof(int),
6304 .mode = 0644,
6305 .proc_handler = proc_dointvec,
6306 },
6307 {
6308 .procname = "ignore_routes_with_linkdown",
6309 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6310 .maxlen = sizeof(int),
6311 .mode = 0644,
6312 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6313 },
6314 {
6315 .procname = "drop_unicast_in_l2_multicast",
6316 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6317 .maxlen = sizeof(int),
6318 .mode = 0644,
6319 .proc_handler = proc_dointvec,
6320 },
6321 {
6322 .procname = "drop_unsolicited_na",
6323 .data = &ipv6_devconf.drop_unsolicited_na,
6324 .maxlen = sizeof(int),
6325 .mode = 0644,
6326 .proc_handler = proc_dointvec,
6327 },
6328 {
6329 .procname = "keep_addr_on_down",
6330 .data = &ipv6_devconf.keep_addr_on_down,
6331 .maxlen = sizeof(int),
6332 .mode = 0644,
6333 .proc_handler = proc_dointvec,
6334
6335 },
6336 {
6337 .procname = "seg6_enabled",
6338 .data = &ipv6_devconf.seg6_enabled,
6339 .maxlen = sizeof(int),
6340 .mode = 0644,
6341 .proc_handler = proc_dointvec,
6342 },
6343 #ifdef CONFIG_IPV6_SEG6_HMAC
6344 {
6345 .procname = "seg6_require_hmac",
6346 .data = &ipv6_devconf.seg6_require_hmac,
6347 .maxlen = sizeof(int),
6348 .mode = 0644,
6349 .proc_handler = proc_dointvec,
6350 },
6351 #endif
6352 {
6353 .procname = "enhanced_dad",
6354 .data = &ipv6_devconf.enhanced_dad,
6355 .maxlen = sizeof(int),
6356 .mode = 0644,
6357 .proc_handler = proc_dointvec,
6358 },
6359 {
6360 .procname = "addr_gen_mode",
6361 .data = &ipv6_devconf.addr_gen_mode,
6362 .maxlen = sizeof(int),
6363 .mode = 0644,
6364 .proc_handler = addrconf_sysctl_addr_gen_mode,
6365 },
6366 {
6367 .procname = "disable_policy",
6368 .data = &ipv6_devconf.disable_policy,
6369 .maxlen = sizeof(int),
6370 .mode = 0644,
6371 .proc_handler = addrconf_sysctl_disable_policy,
6372 },
6373 {
6374 /* sentinel */
6375 }
6376 };
6377
6378 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6379 struct inet6_dev *idev, struct ipv6_devconf *p)
6380 {
6381 int i, ifindex;
6382 struct ctl_table *table;
6383 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6384
6385 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6386 if (!table)
6387 goto out;
6388
6389 for (i = 0; table[i].data; i++) {
6390 table[i].data += (char *)p - (char *)&ipv6_devconf;
6391 /* If one of these is already set, then it is not safe to
6392 * overwrite either of them: this makes proc_dointvec_minmax
6393 * usable.
6394 */
6395 if (!table[i].extra1 && !table[i].extra2) {
6396 table[i].extra1 = idev; /* embedded; no ref */
6397 table[i].extra2 = net;
6398 }
6399 }
6400
6401 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6402
6403 p->sysctl_header = register_net_sysctl(net, path, table);
6404 if (!p->sysctl_header)
6405 goto free;
6406
6407 if (!strcmp(dev_name, "all"))
6408 ifindex = NETCONFA_IFINDEX_ALL;
6409 else if (!strcmp(dev_name, "default"))
6410 ifindex = NETCONFA_IFINDEX_DEFAULT;
6411 else
6412 ifindex = idev->dev->ifindex;
6413 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6414 ifindex, p);
6415 return 0;
6416
6417 free:
6418 kfree(table);
6419 out:
6420 return -ENOBUFS;
6421 }
6422
6423 static void __addrconf_sysctl_unregister(struct net *net,
6424 struct ipv6_devconf *p, int ifindex)
6425 {
6426 struct ctl_table *table;
6427
6428 if (!p->sysctl_header)
6429 return;
6430
6431 table = p->sysctl_header->ctl_table_arg;
6432 unregister_net_sysctl_table(p->sysctl_header);
6433 p->sysctl_header = NULL;
6434 kfree(table);
6435
6436 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6437 }
6438
6439 static int addrconf_sysctl_register(struct inet6_dev *idev)
6440 {
6441 int err;
6442
6443 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6444 return -EINVAL;
6445
6446 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6447 &ndisc_ifinfo_sysctl_change);
6448 if (err)
6449 return err;
6450 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6451 idev, &idev->cnf);
6452 if (err)
6453 neigh_sysctl_unregister(idev->nd_parms);
6454
6455 return err;
6456 }
6457
6458 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6459 {
6460 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6461 idev->dev->ifindex);
6462 neigh_sysctl_unregister(idev->nd_parms);
6463 }
6464
6465
6466 #endif
6467
6468 static int __net_init addrconf_init_net(struct net *net)
6469 {
6470 int err = -ENOMEM;
6471 struct ipv6_devconf *all, *dflt;
6472
6473 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6474 if (!all)
6475 goto err_alloc_all;
6476
6477 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6478 if (!dflt)
6479 goto err_alloc_dflt;
6480
6481 /* these will be inherited by all namespaces */
6482 dflt->autoconf = ipv6_defaults.autoconf;
6483 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6484
6485 dflt->stable_secret.initialized = false;
6486 all->stable_secret.initialized = false;
6487
6488 net->ipv6.devconf_all = all;
6489 net->ipv6.devconf_dflt = dflt;
6490
6491 #ifdef CONFIG_SYSCTL
6492 err = __addrconf_sysctl_register(net, "all", NULL, all);
6493 if (err < 0)
6494 goto err_reg_all;
6495
6496 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6497 if (err < 0)
6498 goto err_reg_dflt;
6499 #endif
6500 return 0;
6501
6502 #ifdef CONFIG_SYSCTL
6503 err_reg_dflt:
6504 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6505 err_reg_all:
6506 kfree(dflt);
6507 #endif
6508 err_alloc_dflt:
6509 kfree(all);
6510 err_alloc_all:
6511 return err;
6512 }
6513
6514 static void __net_exit addrconf_exit_net(struct net *net)
6515 {
6516 #ifdef CONFIG_SYSCTL
6517 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6518 NETCONFA_IFINDEX_DEFAULT);
6519 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6520 NETCONFA_IFINDEX_ALL);
6521 #endif
6522 kfree(net->ipv6.devconf_dflt);
6523 kfree(net->ipv6.devconf_all);
6524 }
6525
6526 static struct pernet_operations addrconf_ops = {
6527 .init = addrconf_init_net,
6528 .exit = addrconf_exit_net,
6529 };
6530
6531 static struct rtnl_af_ops inet6_ops __read_mostly = {
6532 .family = AF_INET6,
6533 .fill_link_af = inet6_fill_link_af,
6534 .get_link_af_size = inet6_get_link_af_size,
6535 .validate_link_af = inet6_validate_link_af,
6536 .set_link_af = inet6_set_link_af,
6537 };
6538
6539 /*
6540 * Init / cleanup code
6541 */
6542
6543 int __init addrconf_init(void)
6544 {
6545 struct inet6_dev *idev;
6546 int i, err;
6547
6548 err = ipv6_addr_label_init();
6549 if (err < 0) {
6550 pr_crit("%s: cannot initialize default policy table: %d\n",
6551 __func__, err);
6552 goto out;
6553 }
6554
6555 err = register_pernet_subsys(&addrconf_ops);
6556 if (err < 0)
6557 goto out_addrlabel;
6558
6559 addrconf_wq = create_workqueue("ipv6_addrconf");
6560 if (!addrconf_wq) {
6561 err = -ENOMEM;
6562 goto out_nowq;
6563 }
6564
6565 /* The addrconf netdev notifier requires that loopback_dev
6566 * has it's ipv6 private information allocated and setup
6567 * before it can bring up and give link-local addresses
6568 * to other devices which are up.
6569 *
6570 * Unfortunately, loopback_dev is not necessarily the first
6571 * entry in the global dev_base list of net devices. In fact,
6572 * it is likely to be the very last entry on that list.
6573 * So this causes the notifier registry below to try and
6574 * give link-local addresses to all devices besides loopback_dev
6575 * first, then loopback_dev, which cases all the non-loopback_dev
6576 * devices to fail to get a link-local address.
6577 *
6578 * So, as a temporary fix, allocate the ipv6 structure for
6579 * loopback_dev first by hand.
6580 * Longer term, all of the dependencies ipv6 has upon the loopback
6581 * device and it being up should be removed.
6582 */
6583 rtnl_lock();
6584 idev = ipv6_add_dev(init_net.loopback_dev);
6585 rtnl_unlock();
6586 if (IS_ERR(idev)) {
6587 err = PTR_ERR(idev);
6588 goto errlo;
6589 }
6590
6591 ip6_route_init_special_entries();
6592
6593 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6594 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6595
6596 register_netdevice_notifier(&ipv6_dev_notf);
6597
6598 addrconf_verify();
6599
6600 rtnl_af_register(&inet6_ops);
6601
6602 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6603 0);
6604 if (err < 0)
6605 goto errout;
6606
6607 /* Only the first call to __rtnl_register can fail */
6608 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0);
6609 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0);
6610 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6611 inet6_dump_ifaddr, 0);
6612 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6613 inet6_dump_ifmcaddr, 0);
6614 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6615 inet6_dump_ifacaddr, 0);
6616 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6617 inet6_netconf_dump_devconf, 0);
6618
6619 ipv6_addr_label_rtnl_register();
6620
6621 return 0;
6622 errout:
6623 rtnl_af_unregister(&inet6_ops);
6624 unregister_netdevice_notifier(&ipv6_dev_notf);
6625 errlo:
6626 destroy_workqueue(addrconf_wq);
6627 out_nowq:
6628 unregister_pernet_subsys(&addrconf_ops);
6629 out_addrlabel:
6630 ipv6_addr_label_cleanup();
6631 out:
6632 return err;
6633 }
6634
6635 void addrconf_cleanup(void)
6636 {
6637 struct net_device *dev;
6638 int i;
6639
6640 unregister_netdevice_notifier(&ipv6_dev_notf);
6641 unregister_pernet_subsys(&addrconf_ops);
6642 ipv6_addr_label_cleanup();
6643
6644 rtnl_lock();
6645
6646 __rtnl_af_unregister(&inet6_ops);
6647
6648 /* clean dev list */
6649 for_each_netdev(&init_net, dev) {
6650 if (__in6_dev_get(dev) == NULL)
6651 continue;
6652 addrconf_ifdown(dev, 1);
6653 }
6654 addrconf_ifdown(init_net.loopback_dev, 2);
6655
6656 /*
6657 * Check hash table.
6658 */
6659 spin_lock_bh(&addrconf_hash_lock);
6660 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6661 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6662 spin_unlock_bh(&addrconf_hash_lock);
6663 cancel_delayed_work(&addr_chk_work);
6664 rtnl_unlock();
6665
6666 destroy_workqueue(addrconf_wq);
6667 }