1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 */
10
11 /*
12 * Changes:
13 *
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
17 * unload.
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
20 * packets.
21 * yoshfuji@USAGI : Fixed interval between DAD
22 * packets.
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
26 * support.
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
31 * seq_file.
32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
34 * status etc.
35 */
36
37 #define pr_fmt(fmt) "IPv6: " fmt
38
39 #include <linux/errno.h>
40 #include <linux/types.h>
41 #include <linux/kernel.h>
42 #include <linux/sched/signal.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/inet.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64 #include <linux/hash.h>
65
66 #include <net/ip_tunnels.h>
67 #include <net/net_namespace.h>
68 #include <net/sock.h>
69 #include <net/snmp.h>
70
71 #include <net/6lowpan.h>
72 #include <net/firewire.h>
73 #include <net/ipv6.h>
74 #include <net/protocol.h>
75 #include <net/ndisc.h>
76 #include <net/ip6_route.h>
77 #include <net/addrconf.h>
78 #include <net/tcp.h>
79 #include <net/ip.h>
80 #include <net/netlink.h>
81 #include <net/pkt_sched.h>
82 #include <net/l3mdev.h>
83 #include <linux/if_tunnel.h>
84 #include <linux/rtnetlink.h>
85 #include <linux/netconf.h>
86 #include <linux/random.h>
87 #include <linux/uaccess.h>
88 #include <asm/unaligned.h>
89
90 #include <linux/proc_fs.h>
91 #include <linux/seq_file.h>
92 #include <linux/export.h>
93 #include <linux/ioam6.h>
94
95 #define INFINITY_LIFE_TIME 0xFFFFFFFF
96
97 #define IPV6_MAX_STRLEN \
98 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
99
100 static inline u32 cstamp_delta(unsigned long cstamp)
101 {
102 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
103 }
104
105 static inline s32 rfc3315_s14_backoff_init(s32 irt)
106 {
107 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
108 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt;
109 do_div(tmp, 1000000);
110 return (s32)tmp;
111 }
112
113 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
114 {
115 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
116 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt;
117 do_div(tmp, 1000000);
118 if ((s32)tmp > mrt) {
119 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
120 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt;
121 do_div(tmp, 1000000);
122 }
123 return (s32)tmp;
124 }
125
126 #ifdef CONFIG_SYSCTL
127 static int addrconf_sysctl_register(struct inet6_dev *idev);
128 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
129 #else
130 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
131 {
132 return 0;
133 }
134
135 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
136 {
137 }
138 #endif
139
140 static void ipv6_gen_rnd_iid(struct in6_addr *addr);
141
142 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
143 static int ipv6_count_addresses(const struct inet6_dev *idev);
144 static int ipv6_generate_stable_address(struct in6_addr *addr,
145 u8 dad_count,
146 const struct inet6_dev *idev);
147
148 #define IN6_ADDR_HSIZE_SHIFT 8
149 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
150
151 static void addrconf_verify(struct net *net);
152 static void addrconf_verify_rtnl(struct net *net);
153
154 static struct workqueue_struct *addrconf_wq;
155
156 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
157 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
158
159 static void addrconf_type_change(struct net_device *dev,
160 unsigned long event);
161 static int addrconf_ifdown(struct net_device *dev, bool unregister);
162
163 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
164 int plen,
165 const struct net_device *dev,
166 u32 flags, u32 noflags,
167 bool no_gw);
168
169 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
170 static void addrconf_dad_work(struct work_struct *w);
171 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
172 bool send_na);
173 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
174 static void addrconf_rs_timer(struct timer_list *t);
175 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
176 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
177
178 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
179 struct prefix_info *pinfo);
180
181 static struct ipv6_devconf ipv6_devconf __read_mostly = {
182 .forwarding = 0,
183 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
184 .mtu6 = IPV6_MIN_MTU,
185 .accept_ra = 1,
186 .accept_redirects = 1,
187 .autoconf = 1,
188 .force_mld_version = 0,
189 .mldv1_unsolicited_report_interval = 10 * HZ,
190 .mldv2_unsolicited_report_interval = HZ,
191 .dad_transmits = 1,
192 .rtr_solicits = MAX_RTR_SOLICITATIONS,
193 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
194 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
195 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
196 .use_tempaddr = 0,
197 .temp_valid_lft = TEMP_VALID_LIFETIME,
198 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
199 .regen_min_advance = REGEN_MIN_ADVANCE,
200 .regen_max_retry = REGEN_MAX_RETRY,
201 .max_desync_factor = MAX_DESYNC_FACTOR,
202 .max_addresses = IPV6_MAX_ADDRESSES,
203 .accept_ra_defrtr = 1,
204 .ra_defrtr_metric = IP6_RT_PRIO_USER,
205 .accept_ra_from_local = 0,
206 .accept_ra_min_hop_limit= 1,
207 .accept_ra_min_lft = 0,
208 .accept_ra_pinfo = 1,
209 #ifdef CONFIG_IPV6_ROUTER_PREF
210 .accept_ra_rtr_pref = 1,
211 .rtr_probe_interval = 60 * HZ,
212 #ifdef CONFIG_IPV6_ROUTE_INFO
213 .accept_ra_rt_info_min_plen = 0,
214 .accept_ra_rt_info_max_plen = 0,
215 #endif
216 #endif
217 .proxy_ndp = 0,
218 .accept_source_route = 0, /* we do not accept RH0 by default. */
219 .disable_ipv6 = 0,
220 .accept_dad = 0,
221 .suppress_frag_ndisc = 1,
222 .accept_ra_mtu = 1,
223 .stable_secret = {
224 .initialized = false,
225 },
226 .use_oif_addrs_only = 0,
227 .ignore_routes_with_linkdown = 0,
228 .keep_addr_on_down = 0,
229 .seg6_enabled = 0,
230 #ifdef CONFIG_IPV6_SEG6_HMAC
231 .seg6_require_hmac = 0,
232 #endif
233 .enhanced_dad = 1,
234 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
235 .disable_policy = 0,
236 .rpl_seg_enabled = 0,
237 .ioam6_enabled = 0,
238 .ioam6_id = IOAM6_DEFAULT_IF_ID,
239 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
240 .ndisc_evict_nocarrier = 1,
241 .ra_honor_pio_life = 0,
242 };
243
244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
245 .forwarding = 0,
246 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
247 .mtu6 = IPV6_MIN_MTU,
248 .accept_ra = 1,
249 .accept_redirects = 1,
250 .autoconf = 1,
251 .force_mld_version = 0,
252 .mldv1_unsolicited_report_interval = 10 * HZ,
253 .mldv2_unsolicited_report_interval = HZ,
254 .dad_transmits = 1,
255 .rtr_solicits = MAX_RTR_SOLICITATIONS,
256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
259 .use_tempaddr = 0,
260 .temp_valid_lft = TEMP_VALID_LIFETIME,
261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
262 .regen_min_advance = REGEN_MIN_ADVANCE,
263 .regen_max_retry = REGEN_MAX_RETRY,
264 .max_desync_factor = MAX_DESYNC_FACTOR,
265 .max_addresses = IPV6_MAX_ADDRESSES,
266 .accept_ra_defrtr = 1,
267 .ra_defrtr_metric = IP6_RT_PRIO_USER,
268 .accept_ra_from_local = 0,
269 .accept_ra_min_hop_limit= 1,
270 .accept_ra_min_lft = 0,
271 .accept_ra_pinfo = 1,
272 #ifdef CONFIG_IPV6_ROUTER_PREF
273 .accept_ra_rtr_pref = 1,
274 .rtr_probe_interval = 60 * HZ,
275 #ifdef CONFIG_IPV6_ROUTE_INFO
276 .accept_ra_rt_info_min_plen = 0,
277 .accept_ra_rt_info_max_plen = 0,
278 #endif
279 #endif
280 .proxy_ndp = 0,
281 .accept_source_route = 0, /* we do not accept RH0 by default. */
282 .disable_ipv6 = 0,
283 .accept_dad = 1,
284 .suppress_frag_ndisc = 1,
285 .accept_ra_mtu = 1,
286 .stable_secret = {
287 .initialized = false,
288 },
289 .use_oif_addrs_only = 0,
290 .ignore_routes_with_linkdown = 0,
291 .keep_addr_on_down = 0,
292 .seg6_enabled = 0,
293 #ifdef CONFIG_IPV6_SEG6_HMAC
294 .seg6_require_hmac = 0,
295 #endif
296 .enhanced_dad = 1,
297 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
298 .disable_policy = 0,
299 .rpl_seg_enabled = 0,
300 .ioam6_enabled = 0,
301 .ioam6_id = IOAM6_DEFAULT_IF_ID,
302 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
303 .ndisc_evict_nocarrier = 1,
304 .ra_honor_pio_life = 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 (!mod_timer(&idev->rs_timer, jiffies + when))
329 in6_dev_hold(idev);
330 }
331
332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
333 unsigned long delay)
334 {
335 in6_ifa_hold(ifp);
336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
337 in6_ifa_put(ifp);
338 }
339
340 static int snmp6_alloc_dev(struct inet6_dev *idev)
341 {
342 int i;
343
344 idev->stats.ipv6 = alloc_percpu_gfp(struct ipstats_mib, GFP_KERNEL_ACCOUNT);
345 if (!idev->stats.ipv6)
346 goto err_ip;
347
348 for_each_possible_cpu(i) {
349 struct ipstats_mib *addrconf_stats;
350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
351 u64_stats_init(&addrconf_stats->syncp);
352 }
353
354
355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
356 GFP_KERNEL);
357 if (!idev->stats.icmpv6dev)
358 goto err_icmp;
359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
360 GFP_KERNEL_ACCOUNT);
361 if (!idev->stats.icmpv6msgdev)
362 goto err_icmpmsg;
363
364 return 0;
365
366 err_icmpmsg:
367 kfree(idev->stats.icmpv6dev);
368 err_icmp:
369 free_percpu(idev->stats.ipv6);
370 err_ip:
371 return -ENOMEM;
372 }
373
374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
375 {
376 struct inet6_dev *ndev;
377 int err = -ENOMEM;
378
379 ASSERT_RTNL();
380
381 if (dev->mtu < IPV6_MIN_MTU && dev != blackhole_netdev)
382 return ERR_PTR(-EINVAL);
383
384 ndev = kzalloc(sizeof(*ndev), GFP_KERNEL_ACCOUNT);
385 if (!ndev)
386 return ERR_PTR(err);
387
388 rwlock_init(&ndev->lock);
389 ndev->dev = dev;
390 INIT_LIST_HEAD(&ndev->addr_list);
391 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
392 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
393
394 if (ndev->cnf.stable_secret.initialized)
395 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
396
397 ndev->cnf.mtu6 = dev->mtu;
398 ndev->ra_mtu = 0;
399 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
400 if (!ndev->nd_parms) {
401 kfree(ndev);
402 return ERR_PTR(err);
403 }
404 if (ndev->cnf.forwarding)
405 dev_disable_lro(dev);
406 /* We refer to the device */
407 netdev_hold(dev, &ndev->dev_tracker, GFP_KERNEL);
408
409 if (snmp6_alloc_dev(ndev) < 0) {
410 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
411 __func__);
412 neigh_parms_release(&nd_tbl, ndev->nd_parms);
413 netdev_put(dev, &ndev->dev_tracker);
414 kfree(ndev);
415 return ERR_PTR(err);
416 }
417
418 if (dev != blackhole_netdev) {
419 if (snmp6_register_dev(ndev) < 0) {
420 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
421 __func__, dev->name);
422 goto err_release;
423 }
424 }
425 /* One reference from device. */
426 refcount_set(&ndev->refcnt, 1);
427
428 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
429 ndev->cnf.accept_dad = -1;
430
431 #if IS_ENABLED(CONFIG_IPV6_SIT)
432 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
433 pr_info("%s: Disabled Multicast RS\n", dev->name);
434 ndev->cnf.rtr_solicits = 0;
435 }
436 #endif
437
438 INIT_LIST_HEAD(&ndev->tempaddr_list);
439 ndev->desync_factor = U32_MAX;
440 if ((dev->flags&IFF_LOOPBACK) ||
441 dev->type == ARPHRD_TUNNEL ||
442 dev->type == ARPHRD_TUNNEL6 ||
443 dev->type == ARPHRD_SIT ||
444 dev->type == ARPHRD_NONE) {
445 ndev->cnf.use_tempaddr = -1;
446 }
447
448 ndev->token = in6addr_any;
449
450 if (netif_running(dev) && addrconf_link_ready(dev))
451 ndev->if_flags |= IF_READY;
452
453 ipv6_mc_init_dev(ndev);
454 ndev->tstamp = jiffies;
455 if (dev != blackhole_netdev) {
456 err = addrconf_sysctl_register(ndev);
457 if (err) {
458 ipv6_mc_destroy_dev(ndev);
459 snmp6_unregister_dev(ndev);
460 goto err_release;
461 }
462 }
463 /* protected by rtnl_lock */
464 rcu_assign_pointer(dev->ip6_ptr, ndev);
465
466 if (dev != blackhole_netdev) {
467 /* Join interface-local all-node multicast group */
468 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
469
470 /* Join all-node multicast group */
471 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
472
473 /* Join all-router multicast group if forwarding is set */
474 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
475 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
476 }
477 return ndev;
478
479 err_release:
480 neigh_parms_release(&nd_tbl, ndev->nd_parms);
481 ndev->dead = 1;
482 in6_dev_finish_destroy(ndev);
483 return ERR_PTR(err);
484 }
485
486 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
487 {
488 struct inet6_dev *idev;
489
490 ASSERT_RTNL();
491
492 idev = __in6_dev_get(dev);
493 if (!idev) {
494 idev = ipv6_add_dev(dev);
495 if (IS_ERR(idev))
496 return idev;
497 }
498
499 if (dev->flags&IFF_UP)
500 ipv6_mc_up(idev);
501 return idev;
502 }
503
504 static int inet6_netconf_msgsize_devconf(int type)
505 {
506 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
507 + nla_total_size(4); /* NETCONFA_IFINDEX */
508 bool all = false;
509
510 if (type == NETCONFA_ALL)
511 all = true;
512
513 if (all || type == NETCONFA_FORWARDING)
514 size += nla_total_size(4);
515 #ifdef CONFIG_IPV6_MROUTE
516 if (all || type == NETCONFA_MC_FORWARDING)
517 size += nla_total_size(4);
518 #endif
519 if (all || type == NETCONFA_PROXY_NEIGH)
520 size += nla_total_size(4);
521
522 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
523 size += nla_total_size(4);
524
525 return size;
526 }
527
528 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
529 struct ipv6_devconf *devconf, u32 portid,
530 u32 seq, int event, unsigned int flags,
531 int type)
532 {
533 struct nlmsghdr *nlh;
534 struct netconfmsg *ncm;
535 bool all = false;
536
537 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
538 flags);
539 if (!nlh)
540 return -EMSGSIZE;
541
542 if (type == NETCONFA_ALL)
543 all = true;
544
545 ncm = nlmsg_data(nlh);
546 ncm->ncm_family = AF_INET6;
547
548 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
549 goto nla_put_failure;
550
551 if (!devconf)
552 goto out;
553
554 if ((all || type == NETCONFA_FORWARDING) &&
555 nla_put_s32(skb, NETCONFA_FORWARDING,
556 READ_ONCE(devconf->forwarding)) < 0)
557 goto nla_put_failure;
558 #ifdef CONFIG_IPV6_MROUTE
559 if ((all || type == NETCONFA_MC_FORWARDING) &&
560 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
561 atomic_read(&devconf->mc_forwarding)) < 0)
562 goto nla_put_failure;
563 #endif
564 if ((all || type == NETCONFA_PROXY_NEIGH) &&
565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH,
566 READ_ONCE(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 READ_ONCE(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_valid_get_req(struct sk_buff *skb,
615 const struct nlmsghdr *nlh,
616 struct nlattr **tb,
617 struct netlink_ext_ack *extack)
618 {
619 int i, err;
620
621 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
622 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
623 return -EINVAL;
624 }
625
626 if (!netlink_strict_get_check(skb))
627 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
628 tb, NETCONFA_MAX,
629 devconf_ipv6_policy, extack);
630
631 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
632 tb, NETCONFA_MAX,
633 devconf_ipv6_policy, extack);
634 if (err)
635 return err;
636
637 for (i = 0; i <= NETCONFA_MAX; i++) {
638 if (!tb[i])
639 continue;
640
641 switch (i) {
642 case NETCONFA_IFINDEX:
643 break;
644 default:
645 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
646 return -EINVAL;
647 }
648 }
649
650 return 0;
651 }
652
653 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
654 struct nlmsghdr *nlh,
655 struct netlink_ext_ack *extack)
656 {
657 struct net *net = sock_net(in_skb->sk);
658 struct nlattr *tb[NETCONFA_MAX+1];
659 struct inet6_dev *in6_dev = NULL;
660 struct net_device *dev = NULL;
661 struct sk_buff *skb;
662 struct ipv6_devconf *devconf;
663 int ifindex;
664 int err;
665
666 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
667 if (err < 0)
668 return err;
669
670 if (!tb[NETCONFA_IFINDEX])
671 return -EINVAL;
672
673 err = -EINVAL;
674 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
675 switch (ifindex) {
676 case NETCONFA_IFINDEX_ALL:
677 devconf = net->ipv6.devconf_all;
678 break;
679 case NETCONFA_IFINDEX_DEFAULT:
680 devconf = net->ipv6.devconf_dflt;
681 break;
682 default:
683 dev = dev_get_by_index(net, ifindex);
684 if (!dev)
685 return -EINVAL;
686 in6_dev = in6_dev_get(dev);
687 if (!in6_dev)
688 goto errout;
689 devconf = &in6_dev->cnf;
690 break;
691 }
692
693 err = -ENOBUFS;
694 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
695 if (!skb)
696 goto errout;
697
698 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
699 NETLINK_CB(in_skb).portid,
700 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
701 NETCONFA_ALL);
702 if (err < 0) {
703 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
704 WARN_ON(err == -EMSGSIZE);
705 kfree_skb(skb);
706 goto errout;
707 }
708 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
709 errout:
710 if (in6_dev)
711 in6_dev_put(in6_dev);
712 dev_put(dev);
713 return err;
714 }
715
716 /* Combine dev_addr_genid and dev_base_seq to detect changes.
717 */
718 static u32 inet6_base_seq(const struct net *net)
719 {
720 u32 res = atomic_read(&net->ipv6.dev_addr_genid) +
721 READ_ONCE(net->dev_base_seq);
722
723 /* Must not return 0 (see nl_dump_check_consistent()).
724 * Chose a value far away from 0.
725 */
726 if (!res)
727 res = 0x80000000;
728 return res;
729 }
730
731 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
732 struct netlink_callback *cb)
733 {
734 const struct nlmsghdr *nlh = cb->nlh;
735 struct net *net = sock_net(skb->sk);
736 struct {
737 unsigned long ifindex;
738 unsigned int all_default;
739 } *ctx = (void *)cb->ctx;
740 struct net_device *dev;
741 struct inet6_dev *idev;
742 int err = 0;
743
744 if (cb->strict_check) {
745 struct netlink_ext_ack *extack = cb->extack;
746 struct netconfmsg *ncm;
747
748 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
749 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
750 return -EINVAL;
751 }
752
753 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
754 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
755 return -EINVAL;
756 }
757 }
758
759 rcu_read_lock();
760 for_each_netdev_dump(net, dev, ctx->ifindex) {
761 idev = __in6_dev_get(dev);
762 if (!idev)
763 continue;
764 err = inet6_netconf_fill_devconf(skb, dev->ifindex,
765 &idev->cnf,
766 NETLINK_CB(cb->skb).portid,
767 nlh->nlmsg_seq,
768 RTM_NEWNETCONF,
769 NLM_F_MULTI,
770 NETCONFA_ALL);
771 if (err < 0)
772 goto done;
773 }
774 if (ctx->all_default == 0) {
775 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
776 net->ipv6.devconf_all,
777 NETLINK_CB(cb->skb).portid,
778 nlh->nlmsg_seq,
779 RTM_NEWNETCONF, NLM_F_MULTI,
780 NETCONFA_ALL);
781 if (err < 0)
782 goto done;
783 ctx->all_default++;
784 }
785 if (ctx->all_default == 1) {
786 err = inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
787 net->ipv6.devconf_dflt,
788 NETLINK_CB(cb->skb).portid,
789 nlh->nlmsg_seq,
790 RTM_NEWNETCONF, NLM_F_MULTI,
791 NETCONFA_ALL);
792 if (err < 0)
793 goto done;
794 ctx->all_default++;
795 }
796 done:
797 rcu_read_unlock();
798 return err;
799 }
800
801 #ifdef CONFIG_SYSCTL
802 static void dev_forward_change(struct inet6_dev *idev)
803 {
804 struct net_device *dev;
805 struct inet6_ifaddr *ifa;
806 LIST_HEAD(tmp_addr_list);
807
808 if (!idev)
809 return;
810 dev = idev->dev;
811 if (idev->cnf.forwarding)
812 dev_disable_lro(dev);
813 if (dev->flags & IFF_MULTICAST) {
814 if (idev->cnf.forwarding) {
815 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
816 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
817 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
818 } else {
819 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
820 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
821 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
822 }
823 }
824
825 read_lock_bh(&idev->lock);
826 list_for_each_entry(ifa, &idev->addr_list, if_list) {
827 if (ifa->flags&IFA_F_TENTATIVE)
828 continue;
829 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
830 }
831 read_unlock_bh(&idev->lock);
832
833 while (!list_empty(&tmp_addr_list)) {
834 ifa = list_first_entry(&tmp_addr_list,
835 struct inet6_ifaddr, if_list_aux);
836 list_del(&ifa->if_list_aux);
837 if (idev->cnf.forwarding)
838 addrconf_join_anycast(ifa);
839 else
840 addrconf_leave_anycast(ifa);
841 }
842
843 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
844 NETCONFA_FORWARDING,
845 dev->ifindex, &idev->cnf);
846 }
847
848
849 static void addrconf_forward_change(struct net *net, __s32 newf)
850 {
851 struct net_device *dev;
852 struct inet6_dev *idev;
853
854 for_each_netdev(net, dev) {
855 idev = __in6_dev_get(dev);
856 if (idev) {
857 int changed = (!idev->cnf.forwarding) ^ (!newf);
858
859 WRITE_ONCE(idev->cnf.forwarding, newf);
860 if (changed)
861 dev_forward_change(idev);
862 }
863 }
864 }
865
866 static int addrconf_fixup_forwarding(const struct ctl_table *table, int *p, int newf)
867 {
868 struct net *net;
869 int old;
870
871 if (!rtnl_trylock())
872 return restart_syscall();
873
874 net = (struct net *)table->extra2;
875 old = *p;
876 WRITE_ONCE(*p, newf);
877
878 if (p == &net->ipv6.devconf_dflt->forwarding) {
879 if ((!newf) ^ (!old))
880 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
881 NETCONFA_FORWARDING,
882 NETCONFA_IFINDEX_DEFAULT,
883 net->ipv6.devconf_dflt);
884 rtnl_unlock();
885 return 0;
886 }
887
888 if (p == &net->ipv6.devconf_all->forwarding) {
889 int old_dflt = net->ipv6.devconf_dflt->forwarding;
890
891 WRITE_ONCE(net->ipv6.devconf_dflt->forwarding, newf);
892 if ((!newf) ^ (!old_dflt))
893 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
894 NETCONFA_FORWARDING,
895 NETCONFA_IFINDEX_DEFAULT,
896 net->ipv6.devconf_dflt);
897
898 addrconf_forward_change(net, newf);
899 if ((!newf) ^ (!old))
900 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
901 NETCONFA_FORWARDING,
902 NETCONFA_IFINDEX_ALL,
903 net->ipv6.devconf_all);
904 } else if ((!newf) ^ (!old))
905 dev_forward_change((struct inet6_dev *)table->extra1);
906 rtnl_unlock();
907
908 if (newf)
909 rt6_purge_dflt_routers(net);
910 return 1;
911 }
912
913 static void addrconf_linkdown_change(struct net *net, __s32 newf)
914 {
915 struct net_device *dev;
916 struct inet6_dev *idev;
917
918 for_each_netdev(net, dev) {
919 idev = __in6_dev_get(dev);
920 if (idev) {
921 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
922
923 WRITE_ONCE(idev->cnf.ignore_routes_with_linkdown, newf);
924 if (changed)
925 inet6_netconf_notify_devconf(dev_net(dev),
926 RTM_NEWNETCONF,
927 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
928 dev->ifindex,
929 &idev->cnf);
930 }
931 }
932 }
933
934 static int addrconf_fixup_linkdown(const struct ctl_table *table, int *p, int newf)
935 {
936 struct net *net;
937 int old;
938
939 if (!rtnl_trylock())
940 return restart_syscall();
941
942 net = (struct net *)table->extra2;
943 old = *p;
944 WRITE_ONCE(*p, newf);
945
946 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
947 if ((!newf) ^ (!old))
948 inet6_netconf_notify_devconf(net,
949 RTM_NEWNETCONF,
950 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
951 NETCONFA_IFINDEX_DEFAULT,
952 net->ipv6.devconf_dflt);
953 rtnl_unlock();
954 return 0;
955 }
956
957 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
958 WRITE_ONCE(net->ipv6.devconf_dflt->ignore_routes_with_linkdown, newf);
959 addrconf_linkdown_change(net, newf);
960 if ((!newf) ^ (!old))
961 inet6_netconf_notify_devconf(net,
962 RTM_NEWNETCONF,
963 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
964 NETCONFA_IFINDEX_ALL,
965 net->ipv6.devconf_all);
966 }
967 rtnl_unlock();
968
969 return 1;
970 }
971
972 #endif
973
974 /* Nobody refers to this ifaddr, destroy it */
975 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
976 {
977 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
978
979 #ifdef NET_REFCNT_DEBUG
980 pr_debug("%s\n", __func__);
981 #endif
982
983 in6_dev_put(ifp->idev);
984
985 if (cancel_delayed_work(&ifp->dad_work))
986 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
987 ifp);
988
989 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
990 pr_warn("Freeing alive inet6 address %p\n", ifp);
991 return;
992 }
993
994 kfree_rcu(ifp, rcu);
995 }
996
997 static void
998 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
999 {
1000 struct list_head *p;
1001 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
1002
1003 /*
1004 * Each device address list is sorted in order of scope -
1005 * global before linklocal.
1006 */
1007 list_for_each(p, &idev->addr_list) {
1008 struct inet6_ifaddr *ifa
1009 = list_entry(p, struct inet6_ifaddr, if_list);
1010 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1011 break;
1012 }
1013
1014 list_add_tail_rcu(&ifp->if_list, p);
1015 }
1016
1017 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1018 {
1019 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1020
1021 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1022 }
1023
1024 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1025 struct net_device *dev, unsigned int hash)
1026 {
1027 struct inet6_ifaddr *ifp;
1028
1029 hlist_for_each_entry(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1030 if (ipv6_addr_equal(&ifp->addr, addr)) {
1031 if (!dev || ifp->idev->dev == dev)
1032 return true;
1033 }
1034 }
1035 return false;
1036 }
1037
1038 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1039 {
1040 struct net *net = dev_net(dev);
1041 unsigned int hash = inet6_addr_hash(net, &ifa->addr);
1042 int err = 0;
1043
1044 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1045
1046 /* Ignore adding duplicate addresses on an interface */
1047 if (ipv6_chk_same_addr(net, &ifa->addr, dev, hash)) {
1048 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1049 err = -EEXIST;
1050 } else {
1051 hlist_add_head_rcu(&ifa->addr_lst, &net->ipv6.inet6_addr_lst[hash]);
1052 }
1053
1054 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1055
1056 return err;
1057 }
1058
1059 /* On success it returns ifp with increased reference count */
1060
1061 static struct inet6_ifaddr *
1062 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1063 bool can_block, struct netlink_ext_ack *extack)
1064 {
1065 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1066 int addr_type = ipv6_addr_type(cfg->pfx);
1067 struct net *net = dev_net(idev->dev);
1068 struct inet6_ifaddr *ifa = NULL;
1069 struct fib6_info *f6i = NULL;
1070 int err = 0;
1071
1072 if (addr_type == IPV6_ADDR_ANY) {
1073 NL_SET_ERR_MSG_MOD(extack, "Invalid address");
1074 return ERR_PTR(-EADDRNOTAVAIL);
1075 } else if (addr_type & IPV6_ADDR_MULTICAST &&
1076 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) {
1077 NL_SET_ERR_MSG_MOD(extack, "Cannot assign multicast address without \"IFA_F_MCAUTOJOIN\" flag");
1078 return ERR_PTR(-EADDRNOTAVAIL);
1079 } else if (!(idev->dev->flags & IFF_LOOPBACK) &&
1080 !netif_is_l3_master(idev->dev) &&
1081 addr_type & IPV6_ADDR_LOOPBACK) {
1082 NL_SET_ERR_MSG_MOD(extack, "Cannot assign loopback address on this device");
1083 return ERR_PTR(-EADDRNOTAVAIL);
1084 }
1085
1086 if (idev->dead) {
1087 NL_SET_ERR_MSG_MOD(extack, "device is going away");
1088 err = -ENODEV;
1089 goto out;
1090 }
1091
1092 if (idev->cnf.disable_ipv6) {
1093 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
1094 err = -EACCES;
1095 goto out;
1096 }
1097
1098 /* validator notifier needs to be blocking;
1099 * do not call in atomic context
1100 */
1101 if (can_block) {
1102 struct in6_validator_info i6vi = {
1103 .i6vi_addr = *cfg->pfx,
1104 .i6vi_dev = idev,
1105 .extack = extack,
1106 };
1107
1108 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1109 err = notifier_to_errno(err);
1110 if (err < 0)
1111 goto out;
1112 }
1113
1114 ifa = kzalloc(sizeof(*ifa), gfp_flags | __GFP_ACCOUNT);
1115 if (!ifa) {
1116 err = -ENOBUFS;
1117 goto out;
1118 }
1119
1120 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags, extack);
1121 if (IS_ERR(f6i)) {
1122 err = PTR_ERR(f6i);
1123 f6i = NULL;
1124 goto out;
1125 }
1126
1127 neigh_parms_data_state_setall(idev->nd_parms);
1128
1129 ifa->addr = *cfg->pfx;
1130 if (cfg->peer_pfx)
1131 ifa->peer_addr = *cfg->peer_pfx;
1132
1133 spin_lock_init(&ifa->lock);
1134 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1135 INIT_HLIST_NODE(&ifa->addr_lst);
1136 ifa->scope = cfg->scope;
1137 ifa->prefix_len = cfg->plen;
1138 ifa->rt_priority = cfg->rt_priority;
1139 ifa->flags = cfg->ifa_flags;
1140 ifa->ifa_proto = cfg->ifa_proto;
1141 /* No need to add the TENTATIVE flag for addresses with NODAD */
1142 if (!(cfg->ifa_flags & IFA_F_NODAD))
1143 ifa->flags |= IFA_F_TENTATIVE;
1144 ifa->valid_lft = cfg->valid_lft;
1145 ifa->prefered_lft = cfg->preferred_lft;
1146 ifa->cstamp = ifa->tstamp = jiffies;
1147 ifa->tokenized = false;
1148
1149 ifa->rt = f6i;
1150
1151 ifa->idev = idev;
1152 in6_dev_hold(idev);
1153
1154 /* For caller */
1155 refcount_set(&ifa->refcnt, 1);
1156
1157 rcu_read_lock();
1158
1159 err = ipv6_add_addr_hash(idev->dev, ifa);
1160 if (err < 0) {
1161 rcu_read_unlock();
1162 goto out;
1163 }
1164
1165 write_lock_bh(&idev->lock);
1166
1167 /* Add to inet6_dev unicast addr list. */
1168 ipv6_link_dev_addr(idev, ifa);
1169
1170 if (ifa->flags&IFA_F_TEMPORARY) {
1171 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1172 in6_ifa_hold(ifa);
1173 }
1174
1175 in6_ifa_hold(ifa);
1176 write_unlock_bh(&idev->lock);
1177
1178 rcu_read_unlock();
1179
1180 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1181 out:
1182 if (unlikely(err < 0)) {
1183 fib6_info_release(f6i);
1184
1185 if (ifa) {
1186 if (ifa->idev)
1187 in6_dev_put(ifa->idev);
1188 kfree(ifa);
1189 }
1190 ifa = ERR_PTR(err);
1191 }
1192
1193 return ifa;
1194 }
1195
1196 enum cleanup_prefix_rt_t {
1197 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1198 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1199 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1200 };
1201
1202 /*
1203 * Check, whether the prefix for ifp would still need a prefix route
1204 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1205 * constants.
1206 *
1207 * 1) we don't purge prefix if address was not permanent.
1208 * prefix is managed by its own lifetime.
1209 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1210 * 3) if there are no addresses, delete prefix.
1211 * 4) if there are still other permanent address(es),
1212 * corresponding prefix is still permanent.
1213 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1214 * don't purge the prefix, assume user space is managing it.
1215 * 6) otherwise, update prefix lifetime to the
1216 * longest valid lifetime among the corresponding
1217 * addresses on the device.
1218 * Note: subsequent RA will update lifetime.
1219 **/
1220 static enum cleanup_prefix_rt_t
1221 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1222 {
1223 struct inet6_ifaddr *ifa;
1224 struct inet6_dev *idev = ifp->idev;
1225 unsigned long lifetime;
1226 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1227
1228 *expires = jiffies;
1229
1230 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1231 if (ifa == ifp)
1232 continue;
1233 if (ifa->prefix_len != ifp->prefix_len ||
1234 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1235 ifp->prefix_len))
1236 continue;
1237 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1238 return CLEANUP_PREFIX_RT_NOP;
1239
1240 action = CLEANUP_PREFIX_RT_EXPIRE;
1241
1242 spin_lock(&ifa->lock);
1243
1244 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1245 /*
1246 * Note: Because this address is
1247 * not permanent, lifetime <
1248 * LONG_MAX / HZ here.
1249 */
1250 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1251 *expires = ifa->tstamp + lifetime * HZ;
1252 spin_unlock(&ifa->lock);
1253 }
1254
1255 return action;
1256 }
1257
1258 static void
1259 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1260 bool del_rt, bool del_peer)
1261 {
1262 struct fib6_table *table;
1263 struct fib6_info *f6i;
1264
1265 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1266 ifp->prefix_len,
1267 ifp->idev->dev, 0, RTF_DEFAULT, true);
1268 if (f6i) {
1269 if (del_rt)
1270 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1271 else {
1272 if (!(f6i->fib6_flags & RTF_EXPIRES)) {
1273 table = f6i->fib6_table;
1274 spin_lock_bh(&table->tb6_lock);
1275
1276 fib6_set_expires(f6i, expires);
1277 fib6_add_gc_list(f6i);
1278
1279 spin_unlock_bh(&table->tb6_lock);
1280 }
1281 fib6_info_release(f6i);
1282 }
1283 }
1284 }
1285
1286
1287 /* This function wants to get referenced ifp and releases it before return */
1288
1289 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1290 {
1291 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1292 struct net *net = dev_net(ifp->idev->dev);
1293 unsigned long expires;
1294 int state;
1295
1296 ASSERT_RTNL();
1297
1298 spin_lock_bh(&ifp->lock);
1299 state = ifp->state;
1300 ifp->state = INET6_IFADDR_STATE_DEAD;
1301 spin_unlock_bh(&ifp->lock);
1302
1303 if (state == INET6_IFADDR_STATE_DEAD)
1304 goto out;
1305
1306 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
1307 hlist_del_init_rcu(&ifp->addr_lst);
1308 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
1309
1310 write_lock_bh(&ifp->idev->lock);
1311
1312 if (ifp->flags&IFA_F_TEMPORARY) {
1313 list_del(&ifp->tmp_list);
1314 if (ifp->ifpub) {
1315 in6_ifa_put(ifp->ifpub);
1316 ifp->ifpub = NULL;
1317 }
1318 __in6_ifa_put(ifp);
1319 }
1320
1321 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1322 action = check_cleanup_prefix_route(ifp, &expires);
1323
1324 list_del_rcu(&ifp->if_list);
1325 __in6_ifa_put(ifp);
1326
1327 write_unlock_bh(&ifp->idev->lock);
1328
1329 addrconf_del_dad_work(ifp);
1330
1331 ipv6_ifa_notify(RTM_DELADDR, ifp);
1332
1333 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1334
1335 if (action != CLEANUP_PREFIX_RT_NOP) {
1336 cleanup_prefix_route(ifp, expires,
1337 action == CLEANUP_PREFIX_RT_DEL, false);
1338 }
1339
1340 /* clean up prefsrc entries */
1341 rt6_remove_prefsrc(ifp);
1342 out:
1343 in6_ifa_put(ifp);
1344 }
1345
1346 static unsigned long ipv6_get_regen_advance(const struct inet6_dev *idev)
1347 {
1348 return READ_ONCE(idev->cnf.regen_min_advance) +
1349 READ_ONCE(idev->cnf.regen_max_retry) *
1350 READ_ONCE(idev->cnf.dad_transmits) *
1351 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1352 }
1353
1354 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1355 {
1356 struct inet6_dev *idev = ifp->idev;
1357 unsigned long tmp_tstamp, age;
1358 unsigned long regen_advance;
1359 unsigned long now = jiffies;
1360 u32 if_public_preferred_lft;
1361 s32 cnf_temp_preferred_lft;
1362 struct inet6_ifaddr *ift;
1363 struct ifa6_config cfg;
1364 long max_desync_factor;
1365 struct in6_addr addr;
1366 int ret = 0;
1367
1368 write_lock_bh(&idev->lock);
1369
1370 retry:
1371 in6_dev_hold(idev);
1372 if (READ_ONCE(idev->cnf.use_tempaddr) <= 0) {
1373 write_unlock_bh(&idev->lock);
1374 pr_info("%s: use_tempaddr is disabled\n", __func__);
1375 in6_dev_put(idev);
1376 ret = -1;
1377 goto out;
1378 }
1379 spin_lock_bh(&ifp->lock);
1380 if (ifp->regen_count++ >= READ_ONCE(idev->cnf.regen_max_retry)) {
1381 WRITE_ONCE(idev->cnf.use_tempaddr, -1); /*XXX*/
1382 spin_unlock_bh(&ifp->lock);
1383 write_unlock_bh(&idev->lock);
1384 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1385 __func__);
1386 in6_dev_put(idev);
1387 ret = -1;
1388 goto out;
1389 }
1390 in6_ifa_hold(ifp);
1391 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1392 ipv6_gen_rnd_iid(&addr);
1393
1394 age = (now - ifp->tstamp) / HZ;
1395
1396 regen_advance = ipv6_get_regen_advance(idev);
1397
1398 /* recalculate max_desync_factor each time and update
1399 * idev->desync_factor if it's larger
1400 */
1401 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1402 max_desync_factor = min_t(long,
1403 READ_ONCE(idev->cnf.max_desync_factor),
1404 cnf_temp_preferred_lft - regen_advance);
1405
1406 if (unlikely(idev->desync_factor > max_desync_factor)) {
1407 if (max_desync_factor > 0) {
1408 get_random_bytes(&idev->desync_factor,
1409 sizeof(idev->desync_factor));
1410 idev->desync_factor %= max_desync_factor;
1411 } else {
1412 idev->desync_factor = 0;
1413 }
1414 }
1415
1416 if_public_preferred_lft = ifp->prefered_lft;
1417
1418 memset(&cfg, 0, sizeof(cfg));
1419 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1420 READ_ONCE(idev->cnf.temp_valid_lft) + age);
1421 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1422 cfg.preferred_lft = min_t(__u32, if_public_preferred_lft, cfg.preferred_lft);
1423 cfg.preferred_lft = min_t(__u32, cfg.valid_lft, cfg.preferred_lft);
1424
1425 cfg.plen = ifp->prefix_len;
1426 tmp_tstamp = ifp->tstamp;
1427 spin_unlock_bh(&ifp->lock);
1428
1429 write_unlock_bh(&idev->lock);
1430
1431 /* From RFC 4941:
1432 *
1433 * A temporary address is created only if this calculated Preferred
1434 * Lifetime is greater than REGEN_ADVANCE time units. In
1435 * particular, an implementation must not create a temporary address
1436 * with a zero Preferred Lifetime.
1437 *
1438 * ...
1439 *
1440 * When creating a temporary address, the lifetime values MUST be
1441 * derived from the corresponding prefix as follows:
1442 *
1443 * ...
1444 *
1445 * * Its Preferred Lifetime is the lower of the Preferred Lifetime
1446 * of the public address or TEMP_PREFERRED_LIFETIME -
1447 * DESYNC_FACTOR.
1448 *
1449 * To comply with the RFC's requirements, clamp the preferred lifetime
1450 * to a minimum of regen_advance, unless that would exceed valid_lft or
1451 * ifp->prefered_lft.
1452 *
1453 * Use age calculation as in addrconf_verify to avoid unnecessary
1454 * temporary addresses being generated.
1455 */
1456 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1457 if (cfg.preferred_lft <= regen_advance + age) {
1458 cfg.preferred_lft = regen_advance + age + 1;
1459 if (cfg.preferred_lft > cfg.valid_lft ||
1460 cfg.preferred_lft > if_public_preferred_lft) {
1461 in6_ifa_put(ifp);
1462 in6_dev_put(idev);
1463 ret = -1;
1464 goto out;
1465 }
1466 }
1467
1468 cfg.ifa_flags = IFA_F_TEMPORARY;
1469 /* set in addrconf_prefix_rcv() */
1470 if (ifp->flags & IFA_F_OPTIMISTIC)
1471 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1472
1473 cfg.pfx = &addr;
1474 cfg.scope = ipv6_addr_scope(cfg.pfx);
1475
1476 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1477 if (IS_ERR(ift)) {
1478 in6_ifa_put(ifp);
1479 in6_dev_put(idev);
1480 pr_info("%s: retry temporary address regeneration\n", __func__);
1481 write_lock_bh(&idev->lock);
1482 goto retry;
1483 }
1484
1485 spin_lock_bh(&ift->lock);
1486 ift->ifpub = ifp;
1487 ift->cstamp = now;
1488 ift->tstamp = tmp_tstamp;
1489 spin_unlock_bh(&ift->lock);
1490
1491 addrconf_dad_start(ift);
1492 in6_ifa_put(ift);
1493 in6_dev_put(idev);
1494 out:
1495 return ret;
1496 }
1497
1498 /*
1499 * Choose an appropriate source address (RFC3484)
1500 */
1501 enum {
1502 IPV6_SADDR_RULE_INIT = 0,
1503 IPV6_SADDR_RULE_LOCAL,
1504 IPV6_SADDR_RULE_SCOPE,
1505 IPV6_SADDR_RULE_PREFERRED,
1506 #ifdef CONFIG_IPV6_MIP6
1507 IPV6_SADDR_RULE_HOA,
1508 #endif
1509 IPV6_SADDR_RULE_OIF,
1510 IPV6_SADDR_RULE_LABEL,
1511 IPV6_SADDR_RULE_PRIVACY,
1512 IPV6_SADDR_RULE_ORCHID,
1513 IPV6_SADDR_RULE_PREFIX,
1514 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1515 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1516 #endif
1517 IPV6_SADDR_RULE_MAX
1518 };
1519
1520 struct ipv6_saddr_score {
1521 int rule;
1522 int addr_type;
1523 struct inet6_ifaddr *ifa;
1524 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1525 int scopedist;
1526 int matchlen;
1527 };
1528
1529 struct ipv6_saddr_dst {
1530 const struct in6_addr *addr;
1531 int ifindex;
1532 int scope;
1533 int label;
1534 unsigned int prefs;
1535 };
1536
1537 static inline int ipv6_saddr_preferred(int type)
1538 {
1539 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1540 return 1;
1541 return 0;
1542 }
1543
1544 static bool ipv6_use_optimistic_addr(const struct net *net,
1545 const struct inet6_dev *idev)
1546 {
1547 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1548 if (!idev)
1549 return false;
1550 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1551 !READ_ONCE(idev->cnf.optimistic_dad))
1552 return false;
1553 if (!READ_ONCE(net->ipv6.devconf_all->use_optimistic) &&
1554 !READ_ONCE(idev->cnf.use_optimistic))
1555 return false;
1556
1557 return true;
1558 #else
1559 return false;
1560 #endif
1561 }
1562
1563 static bool ipv6_allow_optimistic_dad(const struct net *net,
1564 const struct inet6_dev *idev)
1565 {
1566 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1567 if (!idev)
1568 return false;
1569 if (!READ_ONCE(net->ipv6.devconf_all->optimistic_dad) &&
1570 !READ_ONCE(idev->cnf.optimistic_dad))
1571 return false;
1572
1573 return true;
1574 #else
1575 return false;
1576 #endif
1577 }
1578
1579 static int ipv6_get_saddr_eval(struct net *net,
1580 struct ipv6_saddr_score *score,
1581 struct ipv6_saddr_dst *dst,
1582 int i)
1583 {
1584 int ret;
1585
1586 if (i <= score->rule) {
1587 switch (i) {
1588 case IPV6_SADDR_RULE_SCOPE:
1589 ret = score->scopedist;
1590 break;
1591 case IPV6_SADDR_RULE_PREFIX:
1592 ret = score->matchlen;
1593 break;
1594 default:
1595 ret = !!test_bit(i, score->scorebits);
1596 }
1597 goto out;
1598 }
1599
1600 switch (i) {
1601 case IPV6_SADDR_RULE_INIT:
1602 /* Rule 0: remember if hiscore is not ready yet */
1603 ret = !!score->ifa;
1604 break;
1605 case IPV6_SADDR_RULE_LOCAL:
1606 /* Rule 1: Prefer same address */
1607 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1608 break;
1609 case IPV6_SADDR_RULE_SCOPE:
1610 /* Rule 2: Prefer appropriate scope
1611 *
1612 * ret
1613 * ^
1614 * -1 | d 15
1615 * ---+--+-+---> scope
1616 * |
1617 * | d is scope of the destination.
1618 * B-d | \
1619 * | \ <- smaller scope is better if
1620 * B-15 | \ if scope is enough for destination.
1621 * | ret = B - scope (-1 <= scope >= d <= 15).
1622 * d-C-1 | /
1623 * |/ <- greater is better
1624 * -C / if scope is not enough for destination.
1625 * /| ret = scope - C (-1 <= d < scope <= 15).
1626 *
1627 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1628 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1629 * Assume B = 0 and we get C > 29.
1630 */
1631 ret = __ipv6_addr_src_scope(score->addr_type);
1632 if (ret >= dst->scope)
1633 ret = -ret;
1634 else
1635 ret -= 128; /* 30 is enough */
1636 score->scopedist = ret;
1637 break;
1638 case IPV6_SADDR_RULE_PREFERRED:
1639 {
1640 /* Rule 3: Avoid deprecated and optimistic addresses */
1641 u8 avoid = IFA_F_DEPRECATED;
1642
1643 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1644 avoid |= IFA_F_OPTIMISTIC;
1645 ret = ipv6_saddr_preferred(score->addr_type) ||
1646 !(score->ifa->flags & avoid);
1647 break;
1648 }
1649 #ifdef CONFIG_IPV6_MIP6
1650 case IPV6_SADDR_RULE_HOA:
1651 {
1652 /* Rule 4: Prefer home address */
1653 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1654 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1655 break;
1656 }
1657 #endif
1658 case IPV6_SADDR_RULE_OIF:
1659 /* Rule 5: Prefer outgoing interface */
1660 ret = (!dst->ifindex ||
1661 dst->ifindex == score->ifa->idev->dev->ifindex);
1662 break;
1663 case IPV6_SADDR_RULE_LABEL:
1664 /* Rule 6: Prefer matching label */
1665 ret = ipv6_addr_label(net,
1666 &score->ifa->addr, score->addr_type,
1667 score->ifa->idev->dev->ifindex) == dst->label;
1668 break;
1669 case IPV6_SADDR_RULE_PRIVACY:
1670 {
1671 /* Rule 7: Prefer public address
1672 * Note: prefer temporary address if use_tempaddr >= 2
1673 */
1674 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1675 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1676 READ_ONCE(score->ifa->idev->cnf.use_tempaddr) >= 2;
1677 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1678 break;
1679 }
1680 case IPV6_SADDR_RULE_ORCHID:
1681 /* Rule 8-: Prefer ORCHID vs ORCHID or
1682 * non-ORCHID vs non-ORCHID
1683 */
1684 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1685 ipv6_addr_orchid(dst->addr));
1686 break;
1687 case IPV6_SADDR_RULE_PREFIX:
1688 /* Rule 8: Use longest matching prefix */
1689 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1690 if (ret > score->ifa->prefix_len)
1691 ret = score->ifa->prefix_len;
1692 score->matchlen = ret;
1693 break;
1694 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1695 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1696 /* Optimistic addresses still have lower precedence than other
1697 * preferred addresses.
1698 */
1699 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1700 break;
1701 #endif
1702 default:
1703 ret = 0;
1704 }
1705
1706 if (ret)
1707 __set_bit(i, score->scorebits);
1708 score->rule = i;
1709 out:
1710 return ret;
1711 }
1712
1713 static int __ipv6_dev_get_saddr(struct net *net,
1714 struct ipv6_saddr_dst *dst,
1715 struct inet6_dev *idev,
1716 struct ipv6_saddr_score *scores,
1717 int hiscore_idx)
1718 {
1719 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1720
1721 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1722 int i;
1723
1724 /*
1725 * - Tentative Address (RFC2462 section 5.4)
1726 * - A tentative address is not considered
1727 * "assigned to an interface" in the traditional
1728 * sense, unless it is also flagged as optimistic.
1729 * - Candidate Source Address (section 4)
1730 * - In any case, anycast addresses, multicast
1731 * addresses, and the unspecified address MUST
1732 * NOT be included in a candidate set.
1733 */
1734 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1735 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1736 continue;
1737
1738 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1739
1740 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1741 score->addr_type & IPV6_ADDR_MULTICAST)) {
1742 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1743 idev->dev->name);
1744 continue;
1745 }
1746
1747 score->rule = -1;
1748 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1749
1750 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1751 int minihiscore, miniscore;
1752
1753 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1754 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1755
1756 if (minihiscore > miniscore) {
1757 if (i == IPV6_SADDR_RULE_SCOPE &&
1758 score->scopedist > 0) {
1759 /*
1760 * special case:
1761 * each remaining entry
1762 * has too small (not enough)
1763 * scope, because ifa entries
1764 * are sorted by their scope
1765 * values.
1766 */
1767 goto out;
1768 }
1769 break;
1770 } else if (minihiscore < miniscore) {
1771 swap(hiscore, score);
1772 hiscore_idx = 1 - hiscore_idx;
1773
1774 /* restore our iterator */
1775 score->ifa = hiscore->ifa;
1776
1777 break;
1778 }
1779 }
1780 }
1781 out:
1782 return hiscore_idx;
1783 }
1784
1785 static int ipv6_get_saddr_master(struct net *net,
1786 const struct net_device *dst_dev,
1787 const struct net_device *master,
1788 struct ipv6_saddr_dst *dst,
1789 struct ipv6_saddr_score *scores,
1790 int hiscore_idx)
1791 {
1792 struct inet6_dev *idev;
1793
1794 idev = __in6_dev_get(dst_dev);
1795 if (idev)
1796 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1797 scores, hiscore_idx);
1798
1799 idev = __in6_dev_get(master);
1800 if (idev)
1801 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1802 scores, hiscore_idx);
1803
1804 return hiscore_idx;
1805 }
1806
1807 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1808 const struct in6_addr *daddr, unsigned int prefs,
1809 struct in6_addr *saddr)
1810 {
1811 struct ipv6_saddr_score scores[2], *hiscore;
1812 struct ipv6_saddr_dst dst;
1813 struct inet6_dev *idev;
1814 struct net_device *dev;
1815 int dst_type;
1816 bool use_oif_addr = false;
1817 int hiscore_idx = 0;
1818 int ret = 0;
1819
1820 dst_type = __ipv6_addr_type(daddr);
1821 dst.addr = daddr;
1822 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1823 dst.scope = __ipv6_addr_src_scope(dst_type);
1824 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1825 dst.prefs = prefs;
1826
1827 scores[hiscore_idx].rule = -1;
1828 scores[hiscore_idx].ifa = NULL;
1829
1830 rcu_read_lock();
1831
1832 /* Candidate Source Address (section 4)
1833 * - multicast and link-local destination address,
1834 * the set of candidate source address MUST only
1835 * include addresses assigned to interfaces
1836 * belonging to the same link as the outgoing
1837 * interface.
1838 * (- For site-local destination addresses, the
1839 * set of candidate source addresses MUST only
1840 * include addresses assigned to interfaces
1841 * belonging to the same site as the outgoing
1842 * interface.)
1843 * - "It is RECOMMENDED that the candidate source addresses
1844 * be the set of unicast addresses assigned to the
1845 * interface that will be used to send to the destination
1846 * (the 'outgoing' interface)." (RFC 6724)
1847 */
1848 if (dst_dev) {
1849 idev = __in6_dev_get(dst_dev);
1850 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1851 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1852 (idev && READ_ONCE(idev->cnf.use_oif_addrs_only))) {
1853 use_oif_addr = true;
1854 }
1855 }
1856
1857 if (use_oif_addr) {
1858 if (idev)
1859 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1860 } else {
1861 const struct net_device *master;
1862 int master_idx = 0;
1863
1864 /* if dst_dev exists and is enslaved to an L3 device, then
1865 * prefer addresses from dst_dev and then the master over
1866 * any other enslaved devices in the L3 domain.
1867 */
1868 master = l3mdev_master_dev_rcu(dst_dev);
1869 if (master) {
1870 master_idx = master->ifindex;
1871
1872 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1873 master, &dst,
1874 scores, hiscore_idx);
1875
1876 if (scores[hiscore_idx].ifa &&
1877 scores[hiscore_idx].scopedist >= 0)
1878 goto out;
1879 }
1880
1881 for_each_netdev_rcu(net, dev) {
1882 /* only consider addresses on devices in the
1883 * same L3 domain
1884 */
1885 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1886 continue;
1887 idev = __in6_dev_get(dev);
1888 if (!idev)
1889 continue;
1890 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1891 }
1892 }
1893
1894 out:
1895 hiscore = &scores[hiscore_idx];
1896 if (!hiscore->ifa)
1897 ret = -EADDRNOTAVAIL;
1898 else
1899 *saddr = hiscore->ifa->addr;
1900
1901 rcu_read_unlock();
1902 return ret;
1903 }
1904 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1905
1906 static int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1907 u32 banned_flags)
1908 {
1909 struct inet6_ifaddr *ifp;
1910 int err = -EADDRNOTAVAIL;
1911
1912 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1913 if (ifp->scope > IFA_LINK)
1914 break;
1915 if (ifp->scope == IFA_LINK &&
1916 !(ifp->flags & banned_flags)) {
1917 *addr = ifp->addr;
1918 err = 0;
1919 break;
1920 }
1921 }
1922 return err;
1923 }
1924
1925 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1926 u32 banned_flags)
1927 {
1928 struct inet6_dev *idev;
1929 int err = -EADDRNOTAVAIL;
1930
1931 rcu_read_lock();
1932 idev = __in6_dev_get(dev);
1933 if (idev) {
1934 read_lock_bh(&idev->lock);
1935 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1936 read_unlock_bh(&idev->lock);
1937 }
1938 rcu_read_unlock();
1939 return err;
1940 }
1941
1942 static int ipv6_count_addresses(const struct inet6_dev *idev)
1943 {
1944 const struct inet6_ifaddr *ifp;
1945 int cnt = 0;
1946
1947 rcu_read_lock();
1948 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1949 cnt++;
1950 rcu_read_unlock();
1951 return cnt;
1952 }
1953
1954 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1955 const struct net_device *dev, int strict)
1956 {
1957 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1958 strict, IFA_F_TENTATIVE);
1959 }
1960 EXPORT_SYMBOL(ipv6_chk_addr);
1961
1962 /* device argument is used to find the L3 domain of interest. If
1963 * skip_dev_check is set, then the ifp device is not checked against
1964 * the passed in dev argument. So the 2 cases for addresses checks are:
1965 * 1. does the address exist in the L3 domain that dev is part of
1966 * (skip_dev_check = true), or
1967 *
1968 * 2. does the address exist on the specific device
1969 * (skip_dev_check = false)
1970 */
1971 static struct net_device *
1972 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1973 const struct net_device *dev, bool skip_dev_check,
1974 int strict, u32 banned_flags)
1975 {
1976 unsigned int hash = inet6_addr_hash(net, addr);
1977 struct net_device *l3mdev, *ndev;
1978 struct inet6_ifaddr *ifp;
1979 u32 ifp_flags;
1980
1981 rcu_read_lock();
1982
1983 l3mdev = l3mdev_master_dev_rcu(dev);
1984 if (skip_dev_check)
1985 dev = NULL;
1986
1987 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
1988 ndev = ifp->idev->dev;
1989
1990 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1991 continue;
1992
1993 /* Decouple optimistic from tentative for evaluation here.
1994 * Ban optimistic addresses explicitly, when required.
1995 */
1996 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1997 ? (ifp->flags&~IFA_F_TENTATIVE)
1998 : ifp->flags;
1999 if (ipv6_addr_equal(&ifp->addr, addr) &&
2000 !(ifp_flags&banned_flags) &&
2001 (!dev || ndev == dev ||
2002 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
2003 rcu_read_unlock();
2004 return ndev;
2005 }
2006 }
2007
2008 rcu_read_unlock();
2009 return NULL;
2010 }
2011
2012 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
2013 const struct net_device *dev, bool skip_dev_check,
2014 int strict, u32 banned_flags)
2015 {
2016 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
2017 strict, banned_flags) ? 1 : 0;
2018 }
2019 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
2020
2021
2022 /* Compares an address/prefix_len with addresses on device @dev.
2023 * If one is found it returns true.
2024 */
2025 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
2026 const unsigned int prefix_len, struct net_device *dev)
2027 {
2028 const struct inet6_ifaddr *ifa;
2029 const struct inet6_dev *idev;
2030 bool ret = false;
2031
2032 rcu_read_lock();
2033 idev = __in6_dev_get(dev);
2034 if (idev) {
2035 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2036 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
2037 if (ret)
2038 break;
2039 }
2040 }
2041 rcu_read_unlock();
2042
2043 return ret;
2044 }
2045 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
2046
2047 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
2048 {
2049 const struct inet6_ifaddr *ifa;
2050 const struct inet6_dev *idev;
2051 int onlink;
2052
2053 onlink = 0;
2054 rcu_read_lock();
2055 idev = __in6_dev_get(dev);
2056 if (idev) {
2057 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2058 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2059 ifa->prefix_len);
2060 if (onlink)
2061 break;
2062 }
2063 }
2064 rcu_read_unlock();
2065 return onlink;
2066 }
2067 EXPORT_SYMBOL(ipv6_chk_prefix);
2068
2069 /**
2070 * ipv6_dev_find - find the first device with a given source address.
2071 * @net: the net namespace
2072 * @addr: the source address
2073 * @dev: used to find the L3 domain of interest
2074 *
2075 * The caller should be protected by RCU, or RTNL.
2076 */
2077 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2078 struct net_device *dev)
2079 {
2080 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2081 IFA_F_TENTATIVE);
2082 }
2083 EXPORT_SYMBOL(ipv6_dev_find);
2084
2085 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2086 struct net_device *dev, int strict)
2087 {
2088 unsigned int hash = inet6_addr_hash(net, addr);
2089 struct inet6_ifaddr *ifp, *result = NULL;
2090
2091 rcu_read_lock();
2092 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
2093 if (ipv6_addr_equal(&ifp->addr, addr)) {
2094 if (!dev || ifp->idev->dev == dev ||
2095 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2096 if (in6_ifa_hold_safe(ifp)) {
2097 result = ifp;
2098 break;
2099 }
2100 }
2101 }
2102 }
2103 rcu_read_unlock();
2104
2105 return result;
2106 }
2107
2108 /* Gets referenced address, destroys ifaddr */
2109
2110 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2111 {
2112 if (dad_failed)
2113 ifp->flags |= IFA_F_DADFAILED;
2114
2115 if (ifp->flags&IFA_F_TEMPORARY) {
2116 struct inet6_ifaddr *ifpub;
2117 spin_lock_bh(&ifp->lock);
2118 ifpub = ifp->ifpub;
2119 if (ifpub) {
2120 in6_ifa_hold(ifpub);
2121 spin_unlock_bh(&ifp->lock);
2122 ipv6_create_tempaddr(ifpub, true);
2123 in6_ifa_put(ifpub);
2124 } else {
2125 spin_unlock_bh(&ifp->lock);
2126 }
2127 ipv6_del_addr(ifp);
2128 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2129 spin_lock_bh(&ifp->lock);
2130 addrconf_del_dad_work(ifp);
2131 ifp->flags |= IFA_F_TENTATIVE;
2132 if (dad_failed)
2133 ifp->flags &= ~IFA_F_OPTIMISTIC;
2134 spin_unlock_bh(&ifp->lock);
2135 if (dad_failed)
2136 ipv6_ifa_notify(0, ifp);
2137 in6_ifa_put(ifp);
2138 } else {
2139 ipv6_del_addr(ifp);
2140 }
2141 }
2142
2143 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2144 {
2145 int err = -ENOENT;
2146
2147 spin_lock_bh(&ifp->lock);
2148 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2149 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2150 err = 0;
2151 }
2152 spin_unlock_bh(&ifp->lock);
2153
2154 return err;
2155 }
2156
2157 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2158 {
2159 struct inet6_dev *idev = ifp->idev;
2160 struct net *net = dev_net(idev->dev);
2161 int max_addresses;
2162
2163 if (addrconf_dad_end(ifp)) {
2164 in6_ifa_put(ifp);
2165 return;
2166 }
2167
2168 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2169 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2170
2171 spin_lock_bh(&ifp->lock);
2172
2173 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2174 struct in6_addr new_addr;
2175 struct inet6_ifaddr *ifp2;
2176 int retries = ifp->stable_privacy_retry + 1;
2177 struct ifa6_config cfg = {
2178 .pfx = &new_addr,
2179 .plen = ifp->prefix_len,
2180 .ifa_flags = ifp->flags,
2181 .valid_lft = ifp->valid_lft,
2182 .preferred_lft = ifp->prefered_lft,
2183 .scope = ifp->scope,
2184 };
2185
2186 if (retries > net->ipv6.sysctl.idgen_retries) {
2187 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2188 ifp->idev->dev->name);
2189 goto errdad;
2190 }
2191
2192 new_addr = ifp->addr;
2193 if (ipv6_generate_stable_address(&new_addr, retries,
2194 idev))
2195 goto errdad;
2196
2197 spin_unlock_bh(&ifp->lock);
2198
2199 max_addresses = READ_ONCE(idev->cnf.max_addresses);
2200 if (max_addresses &&
2201 ipv6_count_addresses(idev) >= max_addresses)
2202 goto lock_errdad;
2203
2204 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2205 ifp->idev->dev->name);
2206
2207 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2208 if (IS_ERR(ifp2))
2209 goto lock_errdad;
2210
2211 spin_lock_bh(&ifp2->lock);
2212 ifp2->stable_privacy_retry = retries;
2213 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2214 spin_unlock_bh(&ifp2->lock);
2215
2216 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2217 in6_ifa_put(ifp2);
2218 lock_errdad:
2219 spin_lock_bh(&ifp->lock);
2220 }
2221
2222 errdad:
2223 /* transition from _POSTDAD to _ERRDAD */
2224 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2225 spin_unlock_bh(&ifp->lock);
2226
2227 addrconf_mod_dad_work(ifp, 0);
2228 in6_ifa_put(ifp);
2229 }
2230
2231 /* Join to solicited addr multicast group.
2232 * caller must hold RTNL */
2233 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2234 {
2235 struct in6_addr maddr;
2236
2237 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2238 return;
2239
2240 addrconf_addr_solict_mult(addr, &maddr);
2241 ipv6_dev_mc_inc(dev, &maddr);
2242 }
2243
2244 /* caller must hold RTNL */
2245 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2246 {
2247 struct in6_addr maddr;
2248
2249 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2250 return;
2251
2252 addrconf_addr_solict_mult(addr, &maddr);
2253 __ipv6_dev_mc_dec(idev, &maddr);
2254 }
2255
2256 /* caller must hold RTNL */
2257 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2258 {
2259 struct in6_addr addr;
2260
2261 if (ifp->prefix_len >= 127) /* RFC 6164 */
2262 return;
2263 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2264 if (ipv6_addr_any(&addr))
2265 return;
2266 __ipv6_dev_ac_inc(ifp->idev, &addr);
2267 }
2268
2269 /* caller must hold RTNL */
2270 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2271 {
2272 struct in6_addr addr;
2273
2274 if (ifp->prefix_len >= 127) /* RFC 6164 */
2275 return;
2276 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2277 if (ipv6_addr_any(&addr))
2278 return;
2279 __ipv6_dev_ac_dec(ifp->idev, &addr);
2280 }
2281
2282 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2283 {
2284 switch (dev->addr_len) {
2285 case ETH_ALEN:
2286 memcpy(eui, dev->dev_addr, 3);
2287 eui[3] = 0xFF;
2288 eui[4] = 0xFE;
2289 memcpy(eui + 5, dev->dev_addr + 3, 3);
2290 break;
2291 case EUI64_ADDR_LEN:
2292 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2293 eui[0] ^= 2;
2294 break;
2295 default:
2296 return -1;
2297 }
2298
2299 return 0;
2300 }
2301
2302 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2303 {
2304 const union fwnet_hwaddr *ha;
2305
2306 if (dev->addr_len != FWNET_ALEN)
2307 return -1;
2308
2309 ha = (const union fwnet_hwaddr *)dev->dev_addr;
2310
2311 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2312 eui[0] ^= 2;
2313 return 0;
2314 }
2315
2316 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2317 {
2318 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2319 if (dev->addr_len != ARCNET_ALEN)
2320 return -1;
2321 memset(eui, 0, 7);
2322 eui[7] = *(u8 *)dev->dev_addr;
2323 return 0;
2324 }
2325
2326 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2327 {
2328 if (dev->addr_len != INFINIBAND_ALEN)
2329 return -1;
2330 memcpy(eui, dev->dev_addr + 12, 8);
2331 eui[0] |= 2;
2332 return 0;
2333 }
2334
2335 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2336 {
2337 if (addr == 0)
2338 return -1;
2339 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2340 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2341 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2342 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2343 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2344 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2345 eui[1] = 0;
2346 eui[2] = 0x5E;
2347 eui[3] = 0xFE;
2348 memcpy(eui + 4, &addr, 4);
2349 return 0;
2350 }
2351
2352 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2353 {
2354 if (dev->priv_flags & IFF_ISATAP)
2355 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2356 return -1;
2357 }
2358
2359 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2360 {
2361 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2362 }
2363
2364 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2365 {
2366 memcpy(eui, dev->perm_addr, 3);
2367 memcpy(eui + 5, dev->perm_addr + 3, 3);
2368 eui[3] = 0xFF;
2369 eui[4] = 0xFE;
2370 eui[0] ^= 2;
2371 return 0;
2372 }
2373
2374 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2375 {
2376 switch (dev->type) {
2377 case ARPHRD_ETHER:
2378 case ARPHRD_FDDI:
2379 return addrconf_ifid_eui48(eui, dev);
2380 case ARPHRD_ARCNET:
2381 return addrconf_ifid_arcnet(eui, dev);
2382 case ARPHRD_INFINIBAND:
2383 return addrconf_ifid_infiniband(eui, dev);
2384 case ARPHRD_SIT:
2385 return addrconf_ifid_sit(eui, dev);
2386 case ARPHRD_IPGRE:
2387 case ARPHRD_TUNNEL:
2388 return addrconf_ifid_gre(eui, dev);
2389 case ARPHRD_6LOWPAN:
2390 return addrconf_ifid_6lowpan(eui, dev);
2391 case ARPHRD_IEEE1394:
2392 return addrconf_ifid_ieee1394(eui, dev);
2393 case ARPHRD_TUNNEL6:
2394 case ARPHRD_IP6GRE:
2395 case ARPHRD_RAWIP:
2396 return addrconf_ifid_ip6tnl(eui, dev);
2397 }
2398 return -1;
2399 }
2400
2401 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2402 {
2403 int err = -1;
2404 struct inet6_ifaddr *ifp;
2405
2406 read_lock_bh(&idev->lock);
2407 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2408 if (ifp->scope > IFA_LINK)
2409 break;
2410 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2411 memcpy(eui, ifp->addr.s6_addr+8, 8);
2412 err = 0;
2413 break;
2414 }
2415 }
2416 read_unlock_bh(&idev->lock);
2417 return err;
2418 }
2419
2420 /* Generation of a randomized Interface Identifier
2421 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2422 */
2423
2424 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2425 {
2426 regen:
2427 get_random_bytes(&addr->s6_addr[8], 8);
2428
2429 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2430 * check if generated address is not inappropriate:
2431 *
2432 * - Reserved IPv6 Interface Identifiers
2433 * - XXX: already assigned to an address on the device
2434 */
2435
2436 /* Subnet-router anycast: 0000:0000:0000:0000 */
2437 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2438 goto regen;
2439
2440 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2441 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2442 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2443 */
2444 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2445 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2446 goto regen;
2447
2448 /* Reserved subnet anycast addresses */
2449 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2450 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2451 goto regen;
2452 }
2453
2454 /*
2455 * Add prefix route.
2456 */
2457
2458 static void
2459 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2460 struct net_device *dev, unsigned long expires,
2461 u32 flags, gfp_t gfp_flags)
2462 {
2463 struct fib6_config cfg = {
2464 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2465 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2466 .fc_ifindex = dev->ifindex,
2467 .fc_expires = expires,
2468 .fc_dst_len = plen,
2469 .fc_flags = RTF_UP | flags,
2470 .fc_nlinfo.nl_net = dev_net(dev),
2471 .fc_protocol = RTPROT_KERNEL,
2472 .fc_type = RTN_UNICAST,
2473 };
2474
2475 cfg.fc_dst = *pfx;
2476
2477 /* Prevent useless cloning on PtP SIT.
2478 This thing is done here expecting that the whole
2479 class of non-broadcast devices need not cloning.
2480 */
2481 #if IS_ENABLED(CONFIG_IPV6_SIT)
2482 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2483 cfg.fc_flags |= RTF_NONEXTHOP;
2484 #endif
2485
2486 ip6_route_add(&cfg, gfp_flags, NULL);
2487 }
2488
2489
2490 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2491 int plen,
2492 const struct net_device *dev,
2493 u32 flags, u32 noflags,
2494 bool no_gw)
2495 {
2496 struct fib6_node *fn;
2497 struct fib6_info *rt = NULL;
2498 struct fib6_table *table;
2499 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2500
2501 table = fib6_get_table(dev_net(dev), tb_id);
2502 if (!table)
2503 return NULL;
2504
2505 rcu_read_lock();
2506 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2507 if (!fn)
2508 goto out;
2509
2510 for_each_fib6_node_rt_rcu(fn) {
2511 /* prefix routes only use builtin fib6_nh */
2512 if (rt->nh)
2513 continue;
2514
2515 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2516 continue;
2517 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2518 continue;
2519 if ((rt->fib6_flags & flags) != flags)
2520 continue;
2521 if ((rt->fib6_flags & noflags) != 0)
2522 continue;
2523 if (!fib6_info_hold_safe(rt))
2524 continue;
2525 break;
2526 }
2527 out:
2528 rcu_read_unlock();
2529 return rt;
2530 }
2531
2532
2533 /* Create "default" multicast route to the interface */
2534
2535 static void addrconf_add_mroute(struct net_device *dev)
2536 {
2537 struct fib6_config cfg = {
2538 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2539 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2540 .fc_ifindex = dev->ifindex,
2541 .fc_dst_len = 8,
2542 .fc_flags = RTF_UP,
2543 .fc_type = RTN_MULTICAST,
2544 .fc_nlinfo.nl_net = dev_net(dev),
2545 .fc_protocol = RTPROT_KERNEL,
2546 };
2547
2548 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2549
2550 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2551 }
2552
2553 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2554 {
2555 struct inet6_dev *idev;
2556
2557 ASSERT_RTNL();
2558
2559 idev = ipv6_find_idev(dev);
2560 if (IS_ERR(idev))
2561 return idev;
2562
2563 if (idev->cnf.disable_ipv6)
2564 return ERR_PTR(-EACCES);
2565
2566 /* Add default multicast route */
2567 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2568 addrconf_add_mroute(dev);
2569
2570 return idev;
2571 }
2572
2573 static void manage_tempaddrs(struct inet6_dev *idev,
2574 struct inet6_ifaddr *ifp,
2575 __u32 valid_lft, __u32 prefered_lft,
2576 bool create, unsigned long now)
2577 {
2578 u32 flags;
2579 struct inet6_ifaddr *ift;
2580
2581 read_lock_bh(&idev->lock);
2582 /* update all temporary addresses in the list */
2583 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2584 int age, max_valid, max_prefered;
2585
2586 if (ifp != ift->ifpub)
2587 continue;
2588
2589 /* RFC 4941 section 3.3:
2590 * If a received option will extend the lifetime of a public
2591 * address, the lifetimes of temporary addresses should
2592 * be extended, subject to the overall constraint that no
2593 * temporary addresses should ever remain "valid" or "preferred"
2594 * for a time longer than (TEMP_VALID_LIFETIME) or
2595 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2596 */
2597 age = (now - ift->cstamp) / HZ;
2598 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age;
2599 if (max_valid < 0)
2600 max_valid = 0;
2601
2602 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) -
2603 idev->desync_factor - age;
2604 if (max_prefered < 0)
2605 max_prefered = 0;
2606
2607 if (valid_lft > max_valid)
2608 valid_lft = max_valid;
2609
2610 if (prefered_lft > max_prefered)
2611 prefered_lft = max_prefered;
2612
2613 spin_lock(&ift->lock);
2614 flags = ift->flags;
2615 ift->valid_lft = valid_lft;
2616 ift->prefered_lft = prefered_lft;
2617 ift->tstamp = now;
2618 if (prefered_lft > 0)
2619 ift->flags &= ~IFA_F_DEPRECATED;
2620
2621 spin_unlock(&ift->lock);
2622 if (!(flags&IFA_F_TENTATIVE))
2623 ipv6_ifa_notify(0, ift);
2624 }
2625
2626 /* Also create a temporary address if it's enabled but no temporary
2627 * address currently exists.
2628 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2629 * as part of cleanup (ie. deleting the mngtmpaddr).
2630 * We don't want that to result in creating a new temporary ip address.
2631 */
2632 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2633 create = true;
2634
2635 if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) {
2636 /* When a new public address is created as described
2637 * in [ADDRCONF], also create a new temporary address.
2638 */
2639 read_unlock_bh(&idev->lock);
2640 ipv6_create_tempaddr(ifp, false);
2641 } else {
2642 read_unlock_bh(&idev->lock);
2643 }
2644 }
2645
2646 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2647 {
2648 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2649 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2650 }
2651
2652 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2653 const struct prefix_info *pinfo,
2654 struct inet6_dev *in6_dev,
2655 const struct in6_addr *addr, int addr_type,
2656 u32 addr_flags, bool sllao, bool tokenized,
2657 __u32 valid_lft, u32 prefered_lft)
2658 {
2659 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2660 int create = 0, update_lft = 0;
2661
2662 if (!ifp && valid_lft) {
2663 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses);
2664 struct ifa6_config cfg = {
2665 .pfx = addr,
2666 .plen = pinfo->prefix_len,
2667 .ifa_flags = addr_flags,
2668 .valid_lft = valid_lft,
2669 .preferred_lft = prefered_lft,
2670 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2671 .ifa_proto = IFAPROT_KERNEL_RA
2672 };
2673
2674 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2675 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) ||
2676 READ_ONCE(in6_dev->cnf.optimistic_dad)) &&
2677 !net->ipv6.devconf_all->forwarding && sllao)
2678 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2679 #endif
2680
2681 /* Do not allow to create too much of autoconfigured
2682 * addresses; this would be too easy way to crash kernel.
2683 */
2684 if (!max_addresses ||
2685 ipv6_count_addresses(in6_dev) < max_addresses)
2686 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2687
2688 if (IS_ERR_OR_NULL(ifp))
2689 return -1;
2690
2691 create = 1;
2692 spin_lock_bh(&ifp->lock);
2693 ifp->flags |= IFA_F_MANAGETEMPADDR;
2694 ifp->cstamp = jiffies;
2695 ifp->tokenized = tokenized;
2696 spin_unlock_bh(&ifp->lock);
2697 addrconf_dad_start(ifp);
2698 }
2699
2700 if (ifp) {
2701 u32 flags;
2702 unsigned long now;
2703 u32 stored_lft;
2704
2705 /* update lifetime (RFC2462 5.5.3 e) */
2706 spin_lock_bh(&ifp->lock);
2707 now = jiffies;
2708 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2709 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2710 else
2711 stored_lft = 0;
2712
2713 /* RFC4862 Section 5.5.3e:
2714 * "Note that the preferred lifetime of the
2715 * corresponding address is always reset to
2716 * the Preferred Lifetime in the received
2717 * Prefix Information option, regardless of
2718 * whether the valid lifetime is also reset or
2719 * ignored."
2720 *
2721 * So we should always update prefered_lft here.
2722 */
2723 update_lft = !create && stored_lft;
2724
2725 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) {
2726 const u32 minimum_lft = min_t(u32,
2727 stored_lft, MIN_VALID_LIFETIME);
2728 valid_lft = max(valid_lft, minimum_lft);
2729 }
2730
2731 if (update_lft) {
2732 ifp->valid_lft = valid_lft;
2733 ifp->prefered_lft = prefered_lft;
2734 WRITE_ONCE(ifp->tstamp, now);
2735 flags = ifp->flags;
2736 ifp->flags &= ~IFA_F_DEPRECATED;
2737 spin_unlock_bh(&ifp->lock);
2738
2739 if (!(flags&IFA_F_TENTATIVE))
2740 ipv6_ifa_notify(0, ifp);
2741 } else
2742 spin_unlock_bh(&ifp->lock);
2743
2744 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2745 create, now);
2746
2747 in6_ifa_put(ifp);
2748 addrconf_verify(net);
2749 }
2750
2751 return 0;
2752 }
2753 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2754
2755 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2756 {
2757 struct prefix_info *pinfo;
2758 struct fib6_table *table;
2759 __u32 valid_lft;
2760 __u32 prefered_lft;
2761 int addr_type, err;
2762 u32 addr_flags = 0;
2763 struct inet6_dev *in6_dev;
2764 struct net *net = dev_net(dev);
2765
2766 pinfo = (struct prefix_info *) opt;
2767
2768 if (len < sizeof(struct prefix_info)) {
2769 netdev_dbg(dev, "addrconf: prefix option too short\n");
2770 return;
2771 }
2772
2773 /*
2774 * Validation checks ([ADDRCONF], page 19)
2775 */
2776
2777 addr_type = ipv6_addr_type(&pinfo->prefix);
2778
2779 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2780 return;
2781
2782 valid_lft = ntohl(pinfo->valid);
2783 prefered_lft = ntohl(pinfo->prefered);
2784
2785 if (prefered_lft > valid_lft) {
2786 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2787 return;
2788 }
2789
2790 in6_dev = in6_dev_get(dev);
2791
2792 if (!in6_dev) {
2793 net_dbg_ratelimited("addrconf: device %s not configured\n",
2794 dev->name);
2795 return;
2796 }
2797
2798 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft)
2799 goto put;
2800
2801 /*
2802 * Two things going on here:
2803 * 1) Add routes for on-link prefixes
2804 * 2) Configure prefixes with the auto flag set
2805 */
2806
2807 if (pinfo->onlink) {
2808 struct fib6_info *rt;
2809 unsigned long rt_expires;
2810
2811 /* Avoid arithmetic overflow. Really, we could
2812 * save rt_expires in seconds, likely valid_lft,
2813 * but it would require division in fib gc, that it
2814 * not good.
2815 */
2816 if (HZ > USER_HZ)
2817 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2818 else
2819 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2820
2821 if (addrconf_finite_timeout(rt_expires))
2822 rt_expires *= HZ;
2823
2824 rt = addrconf_get_prefix_route(&pinfo->prefix,
2825 pinfo->prefix_len,
2826 dev,
2827 RTF_ADDRCONF | RTF_PREFIX_RT,
2828 RTF_DEFAULT, true);
2829
2830 if (rt) {
2831 /* Autoconf prefix route */
2832 if (valid_lft == 0) {
2833 ip6_del_rt(net, rt, false);
2834 rt = NULL;
2835 } else {
2836 table = rt->fib6_table;
2837 spin_lock_bh(&table->tb6_lock);
2838
2839 if (addrconf_finite_timeout(rt_expires)) {
2840 /* not infinity */
2841 fib6_set_expires(rt, jiffies + rt_expires);
2842 fib6_add_gc_list(rt);
2843 } else {
2844 fib6_clean_expires(rt);
2845 fib6_remove_gc_list(rt);
2846 }
2847
2848 spin_unlock_bh(&table->tb6_lock);
2849 }
2850 } else if (valid_lft) {
2851 clock_t expires = 0;
2852 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2853 if (addrconf_finite_timeout(rt_expires)) {
2854 /* not infinity */
2855 flags |= RTF_EXPIRES;
2856 expires = jiffies_to_clock_t(rt_expires);
2857 }
2858 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2859 0, dev, expires, flags,
2860 GFP_ATOMIC);
2861 }
2862 fib6_info_release(rt);
2863 }
2864
2865 /* Try to figure out our local address for this prefix */
2866
2867 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2868 struct in6_addr addr;
2869 bool tokenized = false, dev_addr_generated = false;
2870
2871 if (pinfo->prefix_len == 64) {
2872 memcpy(&addr, &pinfo->prefix, 8);
2873
2874 if (!ipv6_addr_any(&in6_dev->token)) {
2875 read_lock_bh(&in6_dev->lock);
2876 memcpy(addr.s6_addr + 8,
2877 in6_dev->token.s6_addr + 8, 8);
2878 read_unlock_bh(&in6_dev->lock);
2879 tokenized = true;
2880 } else if (is_addr_mode_generate_stable(in6_dev) &&
2881 !ipv6_generate_stable_address(&addr, 0,
2882 in6_dev)) {
2883 addr_flags |= IFA_F_STABLE_PRIVACY;
2884 goto ok;
2885 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2886 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2887 goto put;
2888 } else {
2889 dev_addr_generated = true;
2890 }
2891 goto ok;
2892 }
2893 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2894 pinfo->prefix_len);
2895 goto put;
2896
2897 ok:
2898 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2899 &addr, addr_type,
2900 addr_flags, sllao,
2901 tokenized, valid_lft,
2902 prefered_lft);
2903 if (err)
2904 goto put;
2905
2906 /* Ignore error case here because previous prefix add addr was
2907 * successful which will be notified.
2908 */
2909 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2910 addr_type, addr_flags, sllao,
2911 tokenized, valid_lft,
2912 prefered_lft,
2913 dev_addr_generated);
2914 }
2915 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2916 put:
2917 in6_dev_put(in6_dev);
2918 }
2919
2920 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2921 struct in6_ifreq *ireq)
2922 {
2923 struct ip_tunnel_parm_kern p = { };
2924 int err;
2925
2926 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2927 return -EADDRNOTAVAIL;
2928
2929 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2930 p.iph.version = 4;
2931 p.iph.ihl = 5;
2932 p.iph.protocol = IPPROTO_IPV6;
2933 p.iph.ttl = 64;
2934
2935 if (!dev->netdev_ops->ndo_tunnel_ctl)
2936 return -EOPNOTSUPP;
2937 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2938 if (err)
2939 return err;
2940
2941 dev = __dev_get_by_name(net, p.name);
2942 if (!dev)
2943 return -ENOBUFS;
2944 return dev_open(dev, NULL);
2945 }
2946
2947 /*
2948 * Set destination address.
2949 * Special case for SIT interfaces where we create a new "virtual"
2950 * device.
2951 */
2952 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2953 {
2954 struct net_device *dev;
2955 struct in6_ifreq ireq;
2956 int err = -ENODEV;
2957
2958 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2959 return -ENODEV;
2960 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2961 return -EFAULT;
2962
2963 rtnl_lock();
2964 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2965 if (dev && dev->type == ARPHRD_SIT)
2966 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2967 rtnl_unlock();
2968 return err;
2969 }
2970
2971 static int ipv6_mc_config(struct sock *sk, bool join,
2972 const struct in6_addr *addr, int ifindex)
2973 {
2974 int ret;
2975
2976 ASSERT_RTNL();
2977
2978 lock_sock(sk);
2979 if (join)
2980 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2981 else
2982 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2983 release_sock(sk);
2984
2985 return ret;
2986 }
2987
2988 /*
2989 * Manual configuration of address on an interface
2990 */
2991 static int inet6_addr_add(struct net *net, int ifindex,
2992 struct ifa6_config *cfg,
2993 struct netlink_ext_ack *extack)
2994 {
2995 struct inet6_ifaddr *ifp;
2996 struct inet6_dev *idev;
2997 struct net_device *dev;
2998 unsigned long timeout;
2999 clock_t expires;
3000 u32 flags;
3001
3002 ASSERT_RTNL();
3003
3004 if (cfg->plen > 128) {
3005 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3006 return -EINVAL;
3007 }
3008
3009 /* check the lifetime */
3010 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) {
3011 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid");
3012 return -EINVAL;
3013 }
3014
3015 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) {
3016 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64");
3017 return -EINVAL;
3018 }
3019
3020 dev = __dev_get_by_index(net, ifindex);
3021 if (!dev)
3022 return -ENODEV;
3023
3024 idev = addrconf_add_dev(dev);
3025 if (IS_ERR(idev)) {
3026 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3027 return PTR_ERR(idev);
3028 }
3029
3030 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3031 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3032 true, cfg->pfx, ifindex);
3033
3034 if (ret < 0) {
3035 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed");
3036 return ret;
3037 }
3038 }
3039
3040 cfg->scope = ipv6_addr_scope(cfg->pfx);
3041
3042 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
3043 if (addrconf_finite_timeout(timeout)) {
3044 expires = jiffies_to_clock_t(timeout * HZ);
3045 cfg->valid_lft = timeout;
3046 flags = RTF_EXPIRES;
3047 } else {
3048 expires = 0;
3049 flags = 0;
3050 cfg->ifa_flags |= IFA_F_PERMANENT;
3051 }
3052
3053 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
3054 if (addrconf_finite_timeout(timeout)) {
3055 if (timeout == 0)
3056 cfg->ifa_flags |= IFA_F_DEPRECATED;
3057 cfg->preferred_lft = timeout;
3058 }
3059
3060 ifp = ipv6_add_addr(idev, cfg, true, extack);
3061 if (!IS_ERR(ifp)) {
3062 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
3063 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3064 ifp->rt_priority, dev, expires,
3065 flags, GFP_KERNEL);
3066 }
3067
3068 /* Send a netlink notification if DAD is enabled and
3069 * optimistic flag is not set
3070 */
3071 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
3072 ipv6_ifa_notify(0, ifp);
3073 /*
3074 * Note that section 3.1 of RFC 4429 indicates
3075 * that the Optimistic flag should not be set for
3076 * manually configured addresses
3077 */
3078 addrconf_dad_start(ifp);
3079 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
3080 manage_tempaddrs(idev, ifp, cfg->valid_lft,
3081 cfg->preferred_lft, true, jiffies);
3082 in6_ifa_put(ifp);
3083 addrconf_verify_rtnl(net);
3084 return 0;
3085 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3086 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3087 cfg->pfx, ifindex);
3088 }
3089
3090 return PTR_ERR(ifp);
3091 }
3092
3093 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3094 const struct in6_addr *pfx, unsigned int plen,
3095 struct netlink_ext_ack *extack)
3096 {
3097 struct inet6_ifaddr *ifp;
3098 struct inet6_dev *idev;
3099 struct net_device *dev;
3100
3101 if (plen > 128) {
3102 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3103 return -EINVAL;
3104 }
3105
3106 dev = __dev_get_by_index(net, ifindex);
3107 if (!dev) {
3108 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
3109 return -ENODEV;
3110 }
3111
3112 idev = __in6_dev_get(dev);
3113 if (!idev) {
3114 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3115 return -ENXIO;
3116 }
3117
3118 read_lock_bh(&idev->lock);
3119 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3120 if (ifp->prefix_len == plen &&
3121 ipv6_addr_equal(pfx, &ifp->addr)) {
3122 in6_ifa_hold(ifp);
3123 read_unlock_bh(&idev->lock);
3124
3125 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3126 (ifa_flags & IFA_F_MANAGETEMPADDR))
3127 manage_tempaddrs(idev, ifp, 0, 0, false,
3128 jiffies);
3129 ipv6_del_addr(ifp);
3130 addrconf_verify_rtnl(net);
3131 if (ipv6_addr_is_multicast(pfx)) {
3132 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3133 false, pfx, dev->ifindex);
3134 }
3135 return 0;
3136 }
3137 }
3138 read_unlock_bh(&idev->lock);
3139
3140 NL_SET_ERR_MSG_MOD(extack, "address not found");
3141 return -EADDRNOTAVAIL;
3142 }
3143
3144
3145 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3146 {
3147 struct ifa6_config cfg = {
3148 .ifa_flags = IFA_F_PERMANENT,
3149 .preferred_lft = INFINITY_LIFE_TIME,
3150 .valid_lft = INFINITY_LIFE_TIME,
3151 };
3152 struct in6_ifreq ireq;
3153 int err;
3154
3155 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3156 return -EPERM;
3157
3158 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3159 return -EFAULT;
3160
3161 cfg.pfx = &ireq.ifr6_addr;
3162 cfg.plen = ireq.ifr6_prefixlen;
3163
3164 rtnl_lock();
3165 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3166 rtnl_unlock();
3167 return err;
3168 }
3169
3170 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3171 {
3172 struct in6_ifreq ireq;
3173 int err;
3174
3175 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3176 return -EPERM;
3177
3178 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3179 return -EFAULT;
3180
3181 rtnl_lock();
3182 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3183 ireq.ifr6_prefixlen, NULL);
3184 rtnl_unlock();
3185 return err;
3186 }
3187
3188 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3189 int plen, int scope, u8 proto)
3190 {
3191 struct inet6_ifaddr *ifp;
3192 struct ifa6_config cfg = {
3193 .pfx = addr,
3194 .plen = plen,
3195 .ifa_flags = IFA_F_PERMANENT,
3196 .valid_lft = INFINITY_LIFE_TIME,
3197 .preferred_lft = INFINITY_LIFE_TIME,
3198 .scope = scope,
3199 .ifa_proto = proto
3200 };
3201
3202 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3203 if (!IS_ERR(ifp)) {
3204 spin_lock_bh(&ifp->lock);
3205 ifp->flags &= ~IFA_F_TENTATIVE;
3206 spin_unlock_bh(&ifp->lock);
3207 rt_genid_bump_ipv6(dev_net(idev->dev));
3208 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3209 in6_ifa_put(ifp);
3210 }
3211 }
3212
3213 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3214 static void add_v4_addrs(struct inet6_dev *idev)
3215 {
3216 struct in6_addr addr;
3217 struct net_device *dev;
3218 struct net *net = dev_net(idev->dev);
3219 int scope, plen, offset = 0;
3220 u32 pflags = 0;
3221
3222 ASSERT_RTNL();
3223
3224 memset(&addr, 0, sizeof(struct in6_addr));
3225 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3226 if (idev->dev->addr_len == sizeof(struct in6_addr))
3227 offset = sizeof(struct in6_addr) - 4;
3228 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3229
3230 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
3231 scope = IPV6_ADDR_COMPATv4;
3232 plen = 96;
3233 pflags |= RTF_NONEXTHOP;
3234 } else {
3235 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3236 return;
3237
3238 addr.s6_addr32[0] = htonl(0xfe800000);
3239 scope = IFA_LINK;
3240 plen = 64;
3241 }
3242
3243 if (addr.s6_addr32[3]) {
3244 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
3245 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3246 GFP_KERNEL);
3247 return;
3248 }
3249
3250 for_each_netdev(net, dev) {
3251 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3252 if (in_dev && (dev->flags & IFF_UP)) {
3253 struct in_ifaddr *ifa;
3254 int flag = scope;
3255
3256 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3257 addr.s6_addr32[3] = ifa->ifa_local;
3258
3259 if (ifa->ifa_scope == RT_SCOPE_LINK)
3260 continue;
3261 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3262 if (idev->dev->flags&IFF_POINTOPOINT)
3263 continue;
3264 flag |= IFA_HOST;
3265 }
3266
3267 add_addr(idev, &addr, plen, flag,
3268 IFAPROT_UNSPEC);
3269 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3270 0, pflags, GFP_KERNEL);
3271 }
3272 }
3273 }
3274 }
3275 #endif
3276
3277 static void init_loopback(struct net_device *dev)
3278 {
3279 struct inet6_dev *idev;
3280
3281 /* ::1 */
3282
3283 ASSERT_RTNL();
3284
3285 idev = ipv6_find_idev(dev);
3286 if (IS_ERR(idev)) {
3287 pr_debug("%s: add_dev failed\n", __func__);
3288 return;
3289 }
3290
3291 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
3292 }
3293
3294 void addrconf_add_linklocal(struct inet6_dev *idev,
3295 const struct in6_addr *addr, u32 flags)
3296 {
3297 struct ifa6_config cfg = {
3298 .pfx = addr,
3299 .plen = 64,
3300 .ifa_flags = flags | IFA_F_PERMANENT,
3301 .valid_lft = INFINITY_LIFE_TIME,
3302 .preferred_lft = INFINITY_LIFE_TIME,
3303 .scope = IFA_LINK,
3304 .ifa_proto = IFAPROT_KERNEL_LL
3305 };
3306 struct inet6_ifaddr *ifp;
3307
3308 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3309 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) ||
3310 READ_ONCE(idev->cnf.optimistic_dad)) &&
3311 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3312 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3313 #endif
3314
3315 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3316 if (!IS_ERR(ifp)) {
3317 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3318 0, 0, GFP_ATOMIC);
3319 addrconf_dad_start(ifp);
3320 in6_ifa_put(ifp);
3321 }
3322 }
3323 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3324
3325 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3326 {
3327 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3328 return true;
3329
3330 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3331 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3332 return true;
3333
3334 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3335 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3336 return true;
3337
3338 return false;
3339 }
3340
3341 static int ipv6_generate_stable_address(struct in6_addr *address,
3342 u8 dad_count,
3343 const struct inet6_dev *idev)
3344 {
3345 static DEFINE_SPINLOCK(lock);
3346 static __u32 digest[SHA1_DIGEST_WORDS];
3347 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3348
3349 static union {
3350 char __data[SHA1_BLOCK_SIZE];
3351 struct {
3352 struct in6_addr secret;
3353 __be32 prefix[2];
3354 unsigned char hwaddr[MAX_ADDR_LEN];
3355 u8 dad_count;
3356 } __packed;
3357 } data;
3358
3359 struct in6_addr secret;
3360 struct in6_addr temp;
3361 struct net *net = dev_net(idev->dev);
3362
3363 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3364
3365 if (idev->cnf.stable_secret.initialized)
3366 secret = idev->cnf.stable_secret.secret;
3367 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3368 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3369 else
3370 return -1;
3371
3372 retry:
3373 spin_lock_bh(&lock);
3374
3375 sha1_init(digest);
3376 memset(&data, 0, sizeof(data));
3377 memset(workspace, 0, sizeof(workspace));
3378 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3379 data.prefix[0] = address->s6_addr32[0];
3380 data.prefix[1] = address->s6_addr32[1];
3381 data.secret = secret;
3382 data.dad_count = dad_count;
3383
3384 sha1_transform(digest, data.__data, workspace);
3385
3386 temp = *address;
3387 temp.s6_addr32[2] = (__force __be32)digest[0];
3388 temp.s6_addr32[3] = (__force __be32)digest[1];
3389
3390 spin_unlock_bh(&lock);
3391
3392 if (ipv6_reserved_interfaceid(temp)) {
3393 dad_count++;
3394 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3395 return -1;
3396 goto retry;
3397 }
3398
3399 *address = temp;
3400 return 0;
3401 }
3402
3403 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3404 {
3405 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3406
3407 if (s->initialized)
3408 return;
3409 s = &idev->cnf.stable_secret;
3410 get_random_bytes(&s->secret, sizeof(s->secret));
3411 s->initialized = true;
3412 }
3413
3414 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3415 {
3416 struct in6_addr addr;
3417
3418 /* no link local addresses on L3 master devices */
3419 if (netif_is_l3_master(idev->dev))
3420 return;
3421
3422 /* no link local addresses on devices flagged as slaves */
3423 if (idev->dev->priv_flags & IFF_NO_ADDRCONF)
3424 return;
3425
3426 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3427
3428 switch (idev->cnf.addr_gen_mode) {
3429 case IN6_ADDR_GEN_MODE_RANDOM:
3430 ipv6_gen_mode_random_init(idev);
3431 fallthrough;
3432 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3433 if (!ipv6_generate_stable_address(&addr, 0, idev))
3434 addrconf_add_linklocal(idev, &addr,
3435 IFA_F_STABLE_PRIVACY);
3436 else if (prefix_route)
3437 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3438 0, 0, GFP_KERNEL);
3439 break;
3440 case IN6_ADDR_GEN_MODE_EUI64:
3441 /* addrconf_add_linklocal also adds a prefix_route and we
3442 * only need to care about prefix routes if ipv6_generate_eui64
3443 * couldn't generate one.
3444 */
3445 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3446 addrconf_add_linklocal(idev, &addr, 0);
3447 else if (prefix_route)
3448 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3449 0, 0, GFP_KERNEL);
3450 break;
3451 case IN6_ADDR_GEN_MODE_NONE:
3452 default:
3453 /* will not add any link local address */
3454 break;
3455 }
3456 }
3457
3458 static void addrconf_dev_config(struct net_device *dev)
3459 {
3460 struct inet6_dev *idev;
3461
3462 ASSERT_RTNL();
3463
3464 if ((dev->type != ARPHRD_ETHER) &&
3465 (dev->type != ARPHRD_FDDI) &&
3466 (dev->type != ARPHRD_ARCNET) &&
3467 (dev->type != ARPHRD_INFINIBAND) &&
3468 (dev->type != ARPHRD_IEEE1394) &&
3469 (dev->type != ARPHRD_TUNNEL6) &&
3470 (dev->type != ARPHRD_6LOWPAN) &&
3471 (dev->type != ARPHRD_TUNNEL) &&
3472 (dev->type != ARPHRD_NONE) &&
3473 (dev->type != ARPHRD_RAWIP)) {
3474 /* Alas, we support only Ethernet autoconfiguration. */
3475 idev = __in6_dev_get(dev);
3476 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3477 dev->flags & IFF_MULTICAST)
3478 ipv6_mc_up(idev);
3479 return;
3480 }
3481
3482 idev = addrconf_add_dev(dev);
3483 if (IS_ERR(idev))
3484 return;
3485
3486 /* this device type has no EUI support */
3487 if (dev->type == ARPHRD_NONE &&
3488 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3489 WRITE_ONCE(idev->cnf.addr_gen_mode,
3490 IN6_ADDR_GEN_MODE_RANDOM);
3491
3492 addrconf_addr_gen(idev, false);
3493 }
3494
3495 #if IS_ENABLED(CONFIG_IPV6_SIT)
3496 static void addrconf_sit_config(struct net_device *dev)
3497 {
3498 struct inet6_dev *idev;
3499
3500 ASSERT_RTNL();
3501
3502 /*
3503 * Configure the tunnel with one of our IPv4
3504 * addresses... we should configure all of
3505 * our v4 addrs in the tunnel
3506 */
3507
3508 idev = ipv6_find_idev(dev);
3509 if (IS_ERR(idev)) {
3510 pr_debug("%s: add_dev failed\n", __func__);
3511 return;
3512 }
3513
3514 if (dev->priv_flags & IFF_ISATAP) {
3515 addrconf_addr_gen(idev, false);
3516 return;
3517 }
3518
3519 add_v4_addrs(idev);
3520
3521 if (dev->flags&IFF_POINTOPOINT)
3522 addrconf_add_mroute(dev);
3523 }
3524 #endif
3525
3526 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3527 static void addrconf_gre_config(struct net_device *dev)
3528 {
3529 struct inet6_dev *idev;
3530
3531 ASSERT_RTNL();
3532
3533 idev = ipv6_find_idev(dev);
3534 if (IS_ERR(idev)) {
3535 pr_debug("%s: add_dev failed\n", __func__);
3536 return;
3537 }
3538
3539 if (dev->type == ARPHRD_ETHER) {
3540 addrconf_addr_gen(idev, true);
3541 return;
3542 }
3543
3544 add_v4_addrs(idev);
3545
3546 if (dev->flags & IFF_POINTOPOINT)
3547 addrconf_add_mroute(dev);
3548 }
3549 #endif
3550
3551 static void addrconf_init_auto_addrs(struct net_device *dev)
3552 {
3553 switch (dev->type) {
3554 #if IS_ENABLED(CONFIG_IPV6_SIT)
3555 case ARPHRD_SIT:
3556 addrconf_sit_config(dev);
3557 break;
3558 #endif
3559 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3560 case ARPHRD_IP6GRE:
3561 case ARPHRD_IPGRE:
3562 addrconf_gre_config(dev);
3563 break;
3564 #endif
3565 case ARPHRD_LOOPBACK:
3566 init_loopback(dev);
3567 break;
3568
3569 default:
3570 addrconf_dev_config(dev);
3571 break;
3572 }
3573 }
3574
3575 static int fixup_permanent_addr(struct net *net,
3576 struct inet6_dev *idev,
3577 struct inet6_ifaddr *ifp)
3578 {
3579 /* !fib6_node means the host route was removed from the
3580 * FIB, for example, if 'lo' device is taken down. In that
3581 * case regenerate the host route.
3582 */
3583 if (!ifp->rt || !ifp->rt->fib6_node) {
3584 struct fib6_info *f6i, *prev;
3585
3586 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3587 GFP_ATOMIC, NULL);
3588 if (IS_ERR(f6i))
3589 return PTR_ERR(f6i);
3590
3591 /* ifp->rt can be accessed outside of rtnl */
3592 spin_lock(&ifp->lock);
3593 prev = ifp->rt;
3594 ifp->rt = f6i;
3595 spin_unlock(&ifp->lock);
3596
3597 fib6_info_release(prev);
3598 }
3599
3600 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3601 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3602 ifp->rt_priority, idev->dev, 0, 0,
3603 GFP_ATOMIC);
3604 }
3605
3606 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3607 addrconf_dad_start(ifp);
3608
3609 return 0;
3610 }
3611
3612 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3613 {
3614 struct inet6_ifaddr *ifp, *tmp;
3615 struct inet6_dev *idev;
3616
3617 idev = __in6_dev_get(dev);
3618 if (!idev)
3619 return;
3620
3621 write_lock_bh(&idev->lock);
3622
3623 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3624 if ((ifp->flags & IFA_F_PERMANENT) &&
3625 fixup_permanent_addr(net, idev, ifp) < 0) {
3626 write_unlock_bh(&idev->lock);
3627 in6_ifa_hold(ifp);
3628 ipv6_del_addr(ifp);
3629 write_lock_bh(&idev->lock);
3630
3631 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3632 idev->dev->name, &ifp->addr);
3633 }
3634 }
3635
3636 write_unlock_bh(&idev->lock);
3637 }
3638
3639 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3640 void *ptr)
3641 {
3642 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3643 struct netdev_notifier_change_info *change_info;
3644 struct netdev_notifier_changeupper_info *info;
3645 struct inet6_dev *idev = __in6_dev_get(dev);
3646 struct net *net = dev_net(dev);
3647 int run_pending = 0;
3648 int err;
3649
3650 switch (event) {
3651 case NETDEV_REGISTER:
3652 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3653 idev = ipv6_add_dev(dev);
3654 if (IS_ERR(idev))
3655 return notifier_from_errno(PTR_ERR(idev));
3656 }
3657 break;
3658
3659 case NETDEV_CHANGEMTU:
3660 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3661 if (dev->mtu < IPV6_MIN_MTU) {
3662 addrconf_ifdown(dev, dev != net->loopback_dev);
3663 break;
3664 }
3665
3666 if (idev) {
3667 rt6_mtu_change(dev, dev->mtu);
3668 WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3669 break;
3670 }
3671
3672 /* allocate new idev */
3673 idev = ipv6_add_dev(dev);
3674 if (IS_ERR(idev))
3675 break;
3676
3677 /* device is still not ready */
3678 if (!(idev->if_flags & IF_READY))
3679 break;
3680
3681 run_pending = 1;
3682 fallthrough;
3683 case NETDEV_UP:
3684 case NETDEV_CHANGE:
3685 if (idev && idev->cnf.disable_ipv6)
3686 break;
3687
3688 if (dev->priv_flags & IFF_NO_ADDRCONF) {
3689 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) &&
3690 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST)
3691 ipv6_mc_up(idev);
3692 break;
3693 }
3694
3695 if (event == NETDEV_UP) {
3696 /* restore routes for permanent addresses */
3697 addrconf_permanent_addr(net, dev);
3698
3699 if (!addrconf_link_ready(dev)) {
3700 /* device is not ready yet. */
3701 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3702 dev->name);
3703 break;
3704 }
3705
3706 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3707 idev = ipv6_add_dev(dev);
3708
3709 if (!IS_ERR_OR_NULL(idev)) {
3710 idev->if_flags |= IF_READY;
3711 run_pending = 1;
3712 }
3713 } else if (event == NETDEV_CHANGE) {
3714 if (!addrconf_link_ready(dev)) {
3715 /* device is still not ready. */
3716 rt6_sync_down_dev(dev, event);
3717 break;
3718 }
3719
3720 if (!IS_ERR_OR_NULL(idev)) {
3721 if (idev->if_flags & IF_READY) {
3722 /* device is already configured -
3723 * but resend MLD reports, we might
3724 * have roamed and need to update
3725 * multicast snooping switches
3726 */
3727 ipv6_mc_up(idev);
3728 change_info = ptr;
3729 if (change_info->flags_changed & IFF_NOARP)
3730 addrconf_dad_run(idev, true);
3731 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3732 break;
3733 }
3734 idev->if_flags |= IF_READY;
3735 }
3736
3737 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3738 dev->name);
3739
3740 run_pending = 1;
3741 }
3742
3743 addrconf_init_auto_addrs(dev);
3744
3745 if (!IS_ERR_OR_NULL(idev)) {
3746 if (run_pending)
3747 addrconf_dad_run(idev, false);
3748
3749 /* Device has an address by now */
3750 rt6_sync_up(dev, RTNH_F_DEAD);
3751
3752 /*
3753 * If the MTU changed during the interface down,
3754 * when the interface up, the changed MTU must be
3755 * reflected in the idev as well as routers.
3756 */
3757 if (idev->cnf.mtu6 != dev->mtu &&
3758 dev->mtu >= IPV6_MIN_MTU) {
3759 rt6_mtu_change(dev, dev->mtu);
3760 WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3761 }
3762 WRITE_ONCE(idev->tstamp, jiffies);
3763 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3764
3765 /*
3766 * If the changed mtu during down is lower than
3767 * IPV6_MIN_MTU stop IPv6 on this interface.
3768 */
3769 if (dev->mtu < IPV6_MIN_MTU)
3770 addrconf_ifdown(dev, dev != net->loopback_dev);
3771 }
3772 break;
3773
3774 case NETDEV_DOWN:
3775 case NETDEV_UNREGISTER:
3776 /*
3777 * Remove all addresses from this interface.
3778 */
3779 addrconf_ifdown(dev, event != NETDEV_DOWN);
3780 break;
3781
3782 case NETDEV_CHANGENAME:
3783 if (idev) {
3784 snmp6_unregister_dev(idev);
3785 addrconf_sysctl_unregister(idev);
3786 err = addrconf_sysctl_register(idev);
3787 if (err)
3788 return notifier_from_errno(err);
3789 err = snmp6_register_dev(idev);
3790 if (err) {
3791 addrconf_sysctl_unregister(idev);
3792 return notifier_from_errno(err);
3793 }
3794 }
3795 break;
3796
3797 case NETDEV_PRE_TYPE_CHANGE:
3798 case NETDEV_POST_TYPE_CHANGE:
3799 if (idev)
3800 addrconf_type_change(dev, event);
3801 break;
3802
3803 case NETDEV_CHANGEUPPER:
3804 info = ptr;
3805
3806 /* flush all routes if dev is linked to or unlinked from
3807 * an L3 master device (e.g., VRF)
3808 */
3809 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3810 addrconf_ifdown(dev, false);
3811 }
3812
3813 return NOTIFY_OK;
3814 }
3815
3816 /*
3817 * addrconf module should be notified of a device going up
3818 */
3819 static struct notifier_block ipv6_dev_notf = {
3820 .notifier_call = addrconf_notify,
3821 .priority = ADDRCONF_NOTIFY_PRIORITY,
3822 };
3823
3824 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3825 {
3826 struct inet6_dev *idev;
3827 ASSERT_RTNL();
3828
3829 idev = __in6_dev_get(dev);
3830
3831 if (event == NETDEV_POST_TYPE_CHANGE)
3832 ipv6_mc_remap(idev);
3833 else if (event == NETDEV_PRE_TYPE_CHANGE)
3834 ipv6_mc_unmap(idev);
3835 }
3836
3837 static bool addr_is_local(const struct in6_addr *addr)
3838 {
3839 return ipv6_addr_type(addr) &
3840 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3841 }
3842
3843 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3844 {
3845 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3846 struct net *net = dev_net(dev);
3847 struct inet6_dev *idev;
3848 struct inet6_ifaddr *ifa;
3849 LIST_HEAD(tmp_addr_list);
3850 bool keep_addr = false;
3851 bool was_ready;
3852 int state, i;
3853
3854 ASSERT_RTNL();
3855
3856 rt6_disable_ip(dev, event);
3857
3858 idev = __in6_dev_get(dev);
3859 if (!idev)
3860 return -ENODEV;
3861
3862 /*
3863 * Step 1: remove reference to ipv6 device from parent device.
3864 * Do not dev_put!
3865 */
3866 if (unregister) {
3867 idev->dead = 1;
3868
3869 /* protected by rtnl_lock */
3870 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3871
3872 /* Step 1.5: remove snmp6 entry */
3873 snmp6_unregister_dev(idev);
3874
3875 }
3876
3877 /* combine the user config with event to determine if permanent
3878 * addresses are to be removed from address hash table
3879 */
3880 if (!unregister && !idev->cnf.disable_ipv6) {
3881 /* aggregate the system setting and interface setting */
3882 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down);
3883
3884 if (!_keep_addr)
3885 _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down);
3886
3887 keep_addr = (_keep_addr > 0);
3888 }
3889
3890 /* Step 2: clear hash table */
3891 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3892 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3893
3894 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
3895 restart:
3896 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3897 if (ifa->idev == idev) {
3898 addrconf_del_dad_work(ifa);
3899 /* combined flag + permanent flag decide if
3900 * address is retained on a down event
3901 */
3902 if (!keep_addr ||
3903 !(ifa->flags & IFA_F_PERMANENT) ||
3904 addr_is_local(&ifa->addr)) {
3905 hlist_del_init_rcu(&ifa->addr_lst);
3906 goto restart;
3907 }
3908 }
3909 }
3910 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
3911 }
3912
3913 write_lock_bh(&idev->lock);
3914
3915 addrconf_del_rs_timer(idev);
3916
3917 /* Step 2: clear flags for stateless addrconf, repeated down
3918 * detection
3919 */
3920 was_ready = idev->if_flags & IF_READY;
3921 if (!unregister)
3922 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3923
3924 /* Step 3: clear tempaddr list */
3925 while (!list_empty(&idev->tempaddr_list)) {
3926 ifa = list_first_entry(&idev->tempaddr_list,
3927 struct inet6_ifaddr, tmp_list);
3928 list_del(&ifa->tmp_list);
3929 write_unlock_bh(&idev->lock);
3930 spin_lock_bh(&ifa->lock);
3931
3932 if (ifa->ifpub) {
3933 in6_ifa_put(ifa->ifpub);
3934 ifa->ifpub = NULL;
3935 }
3936 spin_unlock_bh(&ifa->lock);
3937 in6_ifa_put(ifa);
3938 write_lock_bh(&idev->lock);
3939 }
3940
3941 list_for_each_entry(ifa, &idev->addr_list, if_list)
3942 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3943 write_unlock_bh(&idev->lock);
3944
3945 while (!list_empty(&tmp_addr_list)) {
3946 struct fib6_info *rt = NULL;
3947 bool keep;
3948
3949 ifa = list_first_entry(&tmp_addr_list,
3950 struct inet6_ifaddr, if_list_aux);
3951 list_del(&ifa->if_list_aux);
3952
3953 addrconf_del_dad_work(ifa);
3954
3955 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3956 !addr_is_local(&ifa->addr);
3957
3958 spin_lock_bh(&ifa->lock);
3959
3960 if (keep) {
3961 /* set state to skip the notifier below */
3962 state = INET6_IFADDR_STATE_DEAD;
3963 ifa->state = INET6_IFADDR_STATE_PREDAD;
3964 if (!(ifa->flags & IFA_F_NODAD))
3965 ifa->flags |= IFA_F_TENTATIVE;
3966
3967 rt = ifa->rt;
3968 ifa->rt = NULL;
3969 } else {
3970 state = ifa->state;
3971 ifa->state = INET6_IFADDR_STATE_DEAD;
3972 }
3973
3974 spin_unlock_bh(&ifa->lock);
3975
3976 if (rt)
3977 ip6_del_rt(net, rt, false);
3978
3979 if (state != INET6_IFADDR_STATE_DEAD) {
3980 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3981 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3982 } else {
3983 if (idev->cnf.forwarding)
3984 addrconf_leave_anycast(ifa);
3985 addrconf_leave_solict(ifa->idev, &ifa->addr);
3986 }
3987
3988 if (!keep) {
3989 write_lock_bh(&idev->lock);
3990 list_del_rcu(&ifa->if_list);
3991 write_unlock_bh(&idev->lock);
3992 in6_ifa_put(ifa);
3993 }
3994 }
3995
3996 /* Step 5: Discard anycast and multicast list */
3997 if (unregister) {
3998 ipv6_ac_destroy_dev(idev);
3999 ipv6_mc_destroy_dev(idev);
4000 } else if (was_ready) {
4001 ipv6_mc_down(idev);
4002 }
4003
4004 WRITE_ONCE(idev->tstamp, jiffies);
4005 idev->ra_mtu = 0;
4006
4007 /* Last: Shot the device (if unregistered) */
4008 if (unregister) {
4009 addrconf_sysctl_unregister(idev);
4010 neigh_parms_release(&nd_tbl, idev->nd_parms);
4011 neigh_ifdown(&nd_tbl, dev);
4012 in6_dev_put(idev);
4013 }
4014 return 0;
4015 }
4016
4017 static void addrconf_rs_timer(struct timer_list *t)
4018 {
4019 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
4020 struct net_device *dev = idev->dev;
4021 struct in6_addr lladdr;
4022 int rtr_solicits;
4023
4024 write_lock(&idev->lock);
4025 if (idev->dead || !(idev->if_flags & IF_READY))
4026 goto out;
4027
4028 if (!ipv6_accept_ra(idev))
4029 goto out;
4030
4031 /* Announcement received after solicitation was sent */
4032 if (idev->if_flags & IF_RA_RCVD)
4033 goto out;
4034
4035 rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits);
4036
4037 if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) {
4038 write_unlock(&idev->lock);
4039 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4040 ndisc_send_rs(dev, &lladdr,
4041 &in6addr_linklocal_allrouters);
4042 else
4043 goto put;
4044
4045 write_lock(&idev->lock);
4046 idev->rs_interval = rfc3315_s14_backoff_update(
4047 idev->rs_interval,
4048 READ_ONCE(idev->cnf.rtr_solicit_max_interval));
4049 /* The wait after the last probe can be shorter */
4050 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
4051 READ_ONCE(idev->cnf.rtr_solicits)) ?
4052 READ_ONCE(idev->cnf.rtr_solicit_delay) :
4053 idev->rs_interval);
4054 } else {
4055 /*
4056 * Note: we do not support deprecated "all on-link"
4057 * assumption any longer.
4058 */
4059 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
4060 }
4061
4062 out:
4063 write_unlock(&idev->lock);
4064 put:
4065 in6_dev_put(idev);
4066 }
4067
4068 /*
4069 * Duplicate Address Detection
4070 */
4071 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
4072 {
4073 struct inet6_dev *idev = ifp->idev;
4074 unsigned long rand_num;
4075 u64 nonce;
4076
4077 if (ifp->flags & IFA_F_OPTIMISTIC)
4078 rand_num = 0;
4079 else
4080 rand_num = get_random_u32_below(
4081 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1);
4082
4083 nonce = 0;
4084 if (READ_ONCE(idev->cnf.enhanced_dad) ||
4085 READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) {
4086 do
4087 get_random_bytes(&nonce, 6);
4088 while (nonce == 0);
4089 }
4090 ifp->dad_nonce = nonce;
4091 ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits);
4092 addrconf_mod_dad_work(ifp, rand_num);
4093 }
4094
4095 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
4096 {
4097 struct inet6_dev *idev = ifp->idev;
4098 struct net_device *dev = idev->dev;
4099 bool bump_id, notify = false;
4100 struct net *net;
4101
4102 addrconf_join_solict(dev, &ifp->addr);
4103
4104 read_lock_bh(&idev->lock);
4105 spin_lock(&ifp->lock);
4106 if (ifp->state == INET6_IFADDR_STATE_DEAD)
4107 goto out;
4108
4109 net = dev_net(dev);
4110 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4111 (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 &&
4112 READ_ONCE(idev->cnf.accept_dad) < 1) ||
4113 !(ifp->flags&IFA_F_TENTATIVE) ||
4114 ifp->flags & IFA_F_NODAD) {
4115 bool send_na = false;
4116
4117 if (ifp->flags & IFA_F_TENTATIVE &&
4118 !(ifp->flags & IFA_F_OPTIMISTIC))
4119 send_na = true;
4120 bump_id = ifp->flags & IFA_F_TENTATIVE;
4121 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4122 spin_unlock(&ifp->lock);
4123 read_unlock_bh(&idev->lock);
4124
4125 addrconf_dad_completed(ifp, bump_id, send_na);
4126 return;
4127 }
4128
4129 if (!(idev->if_flags & IF_READY)) {
4130 spin_unlock(&ifp->lock);
4131 read_unlock_bh(&idev->lock);
4132 /*
4133 * If the device is not ready:
4134 * - keep it tentative if it is a permanent address.
4135 * - otherwise, kill it.
4136 */
4137 in6_ifa_hold(ifp);
4138 addrconf_dad_stop(ifp, 0);
4139 return;
4140 }
4141
4142 /*
4143 * Optimistic nodes can start receiving
4144 * Frames right away
4145 */
4146 if (ifp->flags & IFA_F_OPTIMISTIC) {
4147 ip6_ins_rt(net, ifp->rt);
4148 if (ipv6_use_optimistic_addr(net, idev)) {
4149 /* Because optimistic nodes can use this address,
4150 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4151 */
4152 notify = true;
4153 }
4154 }
4155
4156 addrconf_dad_kick(ifp);
4157 out:
4158 spin_unlock(&ifp->lock);
4159 read_unlock_bh(&idev->lock);
4160 if (notify)
4161 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4162 }
4163
4164 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4165 {
4166 bool begin_dad = false;
4167
4168 spin_lock_bh(&ifp->lock);
4169 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4170 ifp->state = INET6_IFADDR_STATE_PREDAD;
4171 begin_dad = true;
4172 }
4173 spin_unlock_bh(&ifp->lock);
4174
4175 if (begin_dad)
4176 addrconf_mod_dad_work(ifp, 0);
4177 }
4178
4179 static void addrconf_dad_work(struct work_struct *w)
4180 {
4181 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4182 struct inet6_ifaddr,
4183 dad_work);
4184 struct inet6_dev *idev = ifp->idev;
4185 bool bump_id, disable_ipv6 = false;
4186 struct in6_addr mcaddr;
4187
4188 enum {
4189 DAD_PROCESS,
4190 DAD_BEGIN,
4191 DAD_ABORT,
4192 } action = DAD_PROCESS;
4193
4194 rtnl_lock();
4195
4196 spin_lock_bh(&ifp->lock);
4197 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4198 action = DAD_BEGIN;
4199 ifp->state = INET6_IFADDR_STATE_DAD;
4200 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4201 action = DAD_ABORT;
4202 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4203
4204 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->accept_dad) > 1 ||
4205 READ_ONCE(idev->cnf.accept_dad) > 1) &&
4206 !idev->cnf.disable_ipv6 &&
4207 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4208 struct in6_addr addr;
4209
4210 addr.s6_addr32[0] = htonl(0xfe800000);
4211 addr.s6_addr32[1] = 0;
4212
4213 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4214 ipv6_addr_equal(&ifp->addr, &addr)) {
4215 /* DAD failed for link-local based on MAC */
4216 WRITE_ONCE(idev->cnf.disable_ipv6, 1);
4217
4218 pr_info("%s: IPv6 being disabled!\n",
4219 ifp->idev->dev->name);
4220 disable_ipv6 = true;
4221 }
4222 }
4223 }
4224 spin_unlock_bh(&ifp->lock);
4225
4226 if (action == DAD_BEGIN) {
4227 addrconf_dad_begin(ifp);
4228 goto out;
4229 } else if (action == DAD_ABORT) {
4230 in6_ifa_hold(ifp);
4231 addrconf_dad_stop(ifp, 1);
4232 if (disable_ipv6)
4233 addrconf_ifdown(idev->dev, false);
4234 goto out;
4235 }
4236
4237 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4238 goto out;
4239
4240 write_lock_bh(&idev->lock);
4241 if (idev->dead || !(idev->if_flags & IF_READY)) {
4242 write_unlock_bh(&idev->lock);
4243 goto out;
4244 }
4245
4246 spin_lock(&ifp->lock);
4247 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4248 spin_unlock(&ifp->lock);
4249 write_unlock_bh(&idev->lock);
4250 goto out;
4251 }
4252
4253 if (ifp->dad_probes == 0) {
4254 bool send_na = false;
4255
4256 /*
4257 * DAD was successful
4258 */
4259
4260 if (ifp->flags & IFA_F_TENTATIVE &&
4261 !(ifp->flags & IFA_F_OPTIMISTIC))
4262 send_na = true;
4263 bump_id = ifp->flags & IFA_F_TENTATIVE;
4264 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4265 spin_unlock(&ifp->lock);
4266 write_unlock_bh(&idev->lock);
4267
4268 addrconf_dad_completed(ifp, bump_id, send_na);
4269
4270 goto out;
4271 }
4272
4273 ifp->dad_probes--;
4274 addrconf_mod_dad_work(ifp,
4275 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4276 HZ/100));
4277 spin_unlock(&ifp->lock);
4278 write_unlock_bh(&idev->lock);
4279
4280 /* send a neighbour solicitation for our addr */
4281 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4282 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4283 ifp->dad_nonce);
4284 out:
4285 in6_ifa_put(ifp);
4286 rtnl_unlock();
4287 }
4288
4289 /* ifp->idev must be at least read locked */
4290 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4291 {
4292 struct inet6_ifaddr *ifpiter;
4293 struct inet6_dev *idev = ifp->idev;
4294
4295 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4296 if (ifpiter->scope > IFA_LINK)
4297 break;
4298 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4299 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4300 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4301 IFA_F_PERMANENT)
4302 return false;
4303 }
4304 return true;
4305 }
4306
4307 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4308 bool send_na)
4309 {
4310 struct net_device *dev = ifp->idev->dev;
4311 struct in6_addr lladdr;
4312 bool send_rs, send_mld;
4313
4314 addrconf_del_dad_work(ifp);
4315
4316 /*
4317 * Configure the address for reception. Now it is valid.
4318 */
4319
4320 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4321
4322 /* If added prefix is link local and we are prepared to process
4323 router advertisements, start sending router solicitations.
4324 */
4325
4326 read_lock_bh(&ifp->idev->lock);
4327 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4328 send_rs = send_mld &&
4329 ipv6_accept_ra(ifp->idev) &&
4330 READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 &&
4331 (dev->flags & IFF_LOOPBACK) == 0 &&
4332 (dev->type != ARPHRD_TUNNEL) &&
4333 !netif_is_team_port(dev);
4334 read_unlock_bh(&ifp->idev->lock);
4335
4336 /* While dad is in progress mld report's source address is in6_addrany.
4337 * Resend with proper ll now.
4338 */
4339 if (send_mld)
4340 ipv6_mc_dad_complete(ifp->idev);
4341
4342 /* send unsolicited NA if enabled */
4343 if (send_na &&
4344 (READ_ONCE(ifp->idev->cnf.ndisc_notify) ||
4345 READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) {
4346 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4347 /*router=*/ !!ifp->idev->cnf.forwarding,
4348 /*solicited=*/ false, /*override=*/ true,
4349 /*inc_opt=*/ true);
4350 }
4351
4352 if (send_rs) {
4353 /*
4354 * If a host as already performed a random delay
4355 * [...] as part of DAD [...] there is no need
4356 * to delay again before sending the first RS
4357 */
4358 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4359 return;
4360 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4361
4362 write_lock_bh(&ifp->idev->lock);
4363 spin_lock(&ifp->lock);
4364 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4365 READ_ONCE(ifp->idev->cnf.rtr_solicit_interval));
4366 ifp->idev->rs_probes = 1;
4367 ifp->idev->if_flags |= IF_RS_SENT;
4368 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4369 spin_unlock(&ifp->lock);
4370 write_unlock_bh(&ifp->idev->lock);
4371 }
4372
4373 if (bump_id)
4374 rt_genid_bump_ipv6(dev_net(dev));
4375
4376 /* Make sure that a new temporary address will be created
4377 * before this temporary address becomes deprecated.
4378 */
4379 if (ifp->flags & IFA_F_TEMPORARY)
4380 addrconf_verify_rtnl(dev_net(dev));
4381 }
4382
4383 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4384 {
4385 struct inet6_ifaddr *ifp;
4386
4387 read_lock_bh(&idev->lock);
4388 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4389 spin_lock(&ifp->lock);
4390 if ((ifp->flags & IFA_F_TENTATIVE &&
4391 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4392 if (restart)
4393 ifp->state = INET6_IFADDR_STATE_PREDAD;
4394 addrconf_dad_kick(ifp);
4395 }
4396 spin_unlock(&ifp->lock);
4397 }
4398 read_unlock_bh(&idev->lock);
4399 }
4400
4401 #ifdef CONFIG_PROC_FS
4402 struct if6_iter_state {
4403 struct seq_net_private p;
4404 int bucket;
4405 int offset;
4406 };
4407
4408 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4409 {
4410 struct if6_iter_state *state = seq->private;
4411 struct net *net = seq_file_net(seq);
4412 struct inet6_ifaddr *ifa = NULL;
4413 int p = 0;
4414
4415 /* initial bucket if pos is 0 */
4416 if (pos == 0) {
4417 state->bucket = 0;
4418 state->offset = 0;
4419 }
4420
4421 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4422 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4423 addr_lst) {
4424 /* sync with offset */
4425 if (p < state->offset) {
4426 p++;
4427 continue;
4428 }
4429 return ifa;
4430 }
4431
4432 /* prepare for next bucket */
4433 state->offset = 0;
4434 p = 0;
4435 }
4436 return NULL;
4437 }
4438
4439 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4440 struct inet6_ifaddr *ifa)
4441 {
4442 struct if6_iter_state *state = seq->private;
4443 struct net *net = seq_file_net(seq);
4444
4445 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4446 state->offset++;
4447 return ifa;
4448 }
4449
4450 state->offset = 0;
4451 while (++state->bucket < IN6_ADDR_HSIZE) {
4452 hlist_for_each_entry_rcu(ifa,
4453 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4454 return ifa;
4455 }
4456 }
4457
4458 return NULL;
4459 }
4460
4461 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4462 __acquires(rcu)
4463 {
4464 rcu_read_lock();
4465 return if6_get_first(seq, *pos);
4466 }
4467
4468 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4469 {
4470 struct inet6_ifaddr *ifa;
4471
4472 ifa = if6_get_next(seq, v);
4473 ++*pos;
4474 return ifa;
4475 }
4476
4477 static void if6_seq_stop(struct seq_file *seq, void *v)
4478 __releases(rcu)
4479 {
4480 rcu_read_unlock();
4481 }
4482
4483 static int if6_seq_show(struct seq_file *seq, void *v)
4484 {
4485 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4486 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4487 &ifp->addr,
4488 ifp->idev->dev->ifindex,
4489 ifp->prefix_len,
4490 ifp->scope,
4491 (u8) ifp->flags,
4492 ifp->idev->dev->name);
4493 return 0;
4494 }
4495
4496 static const struct seq_operations if6_seq_ops = {
4497 .start = if6_seq_start,
4498 .next = if6_seq_next,
4499 .show = if6_seq_show,
4500 .stop = if6_seq_stop,
4501 };
4502
4503 static int __net_init if6_proc_net_init(struct net *net)
4504 {
4505 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4506 sizeof(struct if6_iter_state)))
4507 return -ENOMEM;
4508 return 0;
4509 }
4510
4511 static void __net_exit if6_proc_net_exit(struct net *net)
4512 {
4513 remove_proc_entry("if_inet6", net->proc_net);
4514 }
4515
4516 static struct pernet_operations if6_proc_net_ops = {
4517 .init = if6_proc_net_init,
4518 .exit = if6_proc_net_exit,
4519 };
4520
4521 int __init if6_proc_init(void)
4522 {
4523 return register_pernet_subsys(&if6_proc_net_ops);
4524 }
4525
4526 void if6_proc_exit(void)
4527 {
4528 unregister_pernet_subsys(&if6_proc_net_ops);
4529 }
4530 #endif /* CONFIG_PROC_FS */
4531
4532 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4533 /* Check if address is a home address configured on any interface. */
4534 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4535 {
4536 unsigned int hash = inet6_addr_hash(net, addr);
4537 struct inet6_ifaddr *ifp = NULL;
4538 int ret = 0;
4539
4540 rcu_read_lock();
4541 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4542 if (ipv6_addr_equal(&ifp->addr, addr) &&
4543 (ifp->flags & IFA_F_HOMEADDRESS)) {
4544 ret = 1;
4545 break;
4546 }
4547 }
4548 rcu_read_unlock();
4549 return ret;
4550 }
4551 #endif
4552
4553 /* RFC6554 has some algorithm to avoid loops in segment routing by
4554 * checking if the segments contains any of a local interface address.
4555 *
4556 * Quote:
4557 *
4558 * To detect loops in the SRH, a router MUST determine if the SRH
4559 * includes multiple addresses assigned to any interface on that router.
4560 * If such addresses appear more than once and are separated by at least
4561 * one address not assigned to that router.
4562 */
4563 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4564 unsigned char nsegs)
4565 {
4566 const struct in6_addr *addr;
4567 int i, ret = 0, found = 0;
4568 struct inet6_ifaddr *ifp;
4569 bool separated = false;
4570 unsigned int hash;
4571 bool hash_found;
4572
4573 rcu_read_lock();
4574 for (i = 0; i < nsegs; i++) {
4575 addr = &segs[i];
4576 hash = inet6_addr_hash(net, addr);
4577
4578 hash_found = false;
4579 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4580
4581 if (ipv6_addr_equal(&ifp->addr, addr)) {
4582 hash_found = true;
4583 break;
4584 }
4585 }
4586
4587 if (hash_found) {
4588 if (found > 1 && separated) {
4589 ret = 1;
4590 break;
4591 }
4592
4593 separated = false;
4594 found++;
4595 } else {
4596 separated = true;
4597 }
4598 }
4599 rcu_read_unlock();
4600
4601 return ret;
4602 }
4603
4604 /*
4605 * Periodic address status verification
4606 */
4607
4608 static void addrconf_verify_rtnl(struct net *net)
4609 {
4610 unsigned long now, next, next_sec, next_sched;
4611 struct inet6_ifaddr *ifp;
4612 int i;
4613
4614 ASSERT_RTNL();
4615
4616 rcu_read_lock_bh();
4617 now = jiffies;
4618 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4619
4620 cancel_delayed_work(&net->ipv6.addr_chk_work);
4621
4622 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4623 restart:
4624 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4625 unsigned long age;
4626
4627 /* When setting preferred_lft to a value not zero or
4628 * infinity, while valid_lft is infinity
4629 * IFA_F_PERMANENT has a non-infinity life time.
4630 */
4631 if ((ifp->flags & IFA_F_PERMANENT) &&
4632 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4633 continue;
4634
4635 spin_lock(&ifp->lock);
4636 /* We try to batch several events at once. */
4637 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4638
4639 if ((ifp->flags&IFA_F_TEMPORARY) &&
4640 !(ifp->flags&IFA_F_TENTATIVE) &&
4641 ifp->prefered_lft != INFINITY_LIFE_TIME &&
4642 !ifp->regen_count && ifp->ifpub) {
4643 /* This is a non-regenerated temporary addr. */
4644
4645 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev);
4646
4647 if (age + regen_advance >= ifp->prefered_lft) {
4648 struct inet6_ifaddr *ifpub = ifp->ifpub;
4649 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4650 next = ifp->tstamp + ifp->prefered_lft * HZ;
4651
4652 ifp->regen_count++;
4653 in6_ifa_hold(ifp);
4654 in6_ifa_hold(ifpub);
4655 spin_unlock(&ifp->lock);
4656
4657 spin_lock(&ifpub->lock);
4658 ifpub->regen_count = 0;
4659 spin_unlock(&ifpub->lock);
4660 rcu_read_unlock_bh();
4661 ipv6_create_tempaddr(ifpub, true);
4662 in6_ifa_put(ifpub);
4663 in6_ifa_put(ifp);
4664 rcu_read_lock_bh();
4665 goto restart;
4666 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4667 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4668 }
4669
4670 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4671 age >= ifp->valid_lft) {
4672 spin_unlock(&ifp->lock);
4673 in6_ifa_hold(ifp);
4674 rcu_read_unlock_bh();
4675 ipv6_del_addr(ifp);
4676 rcu_read_lock_bh();
4677 goto restart;
4678 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4679 spin_unlock(&ifp->lock);
4680 continue;
4681 } else if (age >= ifp->prefered_lft) {
4682 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4683 int deprecate = 0;
4684
4685 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4686 deprecate = 1;
4687 ifp->flags |= IFA_F_DEPRECATED;
4688 }
4689
4690 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4691 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4692 next = ifp->tstamp + ifp->valid_lft * HZ;
4693
4694 spin_unlock(&ifp->lock);
4695
4696 if (deprecate) {
4697 in6_ifa_hold(ifp);
4698
4699 ipv6_ifa_notify(0, ifp);
4700 in6_ifa_put(ifp);
4701 goto restart;
4702 }
4703 } else {
4704 /* ifp->prefered_lft <= ifp->valid_lft */
4705 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4706 next = ifp->tstamp + ifp->prefered_lft * HZ;
4707 spin_unlock(&ifp->lock);
4708 }
4709 }
4710 }
4711
4712 next_sec = round_jiffies_up(next);
4713 next_sched = next;
4714
4715 /* If rounded timeout is accurate enough, accept it. */
4716 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4717 next_sched = next_sec;
4718
4719 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4720 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4721 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4722
4723 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4724 now, next, next_sec, next_sched);
4725 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
4726 rcu_read_unlock_bh();
4727 }
4728
4729 static void addrconf_verify_work(struct work_struct *w)
4730 {
4731 struct net *net = container_of(to_delayed_work(w), struct net,
4732 ipv6.addr_chk_work);
4733
4734 rtnl_lock();
4735 addrconf_verify_rtnl(net);
4736 rtnl_unlock();
4737 }
4738
4739 static void addrconf_verify(struct net *net)
4740 {
4741 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
4742 }
4743
4744 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4745 struct in6_addr **peer_pfx)
4746 {
4747 struct in6_addr *pfx = NULL;
4748
4749 *peer_pfx = NULL;
4750
4751 if (addr)
4752 pfx = nla_data(addr);
4753
4754 if (local) {
4755 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4756 *peer_pfx = pfx;
4757 pfx = nla_data(local);
4758 }
4759
4760 return pfx;
4761 }
4762
4763 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4764 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4765 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4766 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4767 [IFA_FLAGS] = { .len = sizeof(u32) },
4768 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4769 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4770 [IFA_PROTO] = { .type = NLA_U8 },
4771 };
4772
4773 static int
4774 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4775 struct netlink_ext_ack *extack)
4776 {
4777 struct net *net = sock_net(skb->sk);
4778 struct ifaddrmsg *ifm;
4779 struct nlattr *tb[IFA_MAX+1];
4780 struct in6_addr *pfx, *peer_pfx;
4781 u32 ifa_flags;
4782 int err;
4783
4784 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4785 ifa_ipv6_policy, extack);
4786 if (err < 0)
4787 return err;
4788
4789 ifm = nlmsg_data(nlh);
4790 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4791 if (!pfx)
4792 return -EINVAL;
4793
4794 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4795
4796 /* We ignore other flags so far. */
4797 ifa_flags &= IFA_F_MANAGETEMPADDR;
4798
4799 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4800 ifm->ifa_prefixlen, extack);
4801 }
4802
4803 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4804 unsigned long expires, u32 flags,
4805 bool modify_peer)
4806 {
4807 struct fib6_table *table;
4808 struct fib6_info *f6i;
4809 u32 prio;
4810
4811 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4812 ifp->prefix_len,
4813 ifp->idev->dev, 0, RTF_DEFAULT, true);
4814 if (!f6i)
4815 return -ENOENT;
4816
4817 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4818 if (f6i->fib6_metric != prio) {
4819 /* delete old one */
4820 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4821
4822 /* add new one */
4823 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4824 ifp->prefix_len,
4825 ifp->rt_priority, ifp->idev->dev,
4826 expires, flags, GFP_KERNEL);
4827 } else {
4828 table = f6i->fib6_table;
4829 spin_lock_bh(&table->tb6_lock);
4830
4831 if (!(flags & RTF_EXPIRES)) {
4832 fib6_clean_expires(f6i);
4833 fib6_remove_gc_list(f6i);
4834 } else {
4835 fib6_set_expires(f6i, expires);
4836 fib6_add_gc_list(f6i);
4837 }
4838
4839 spin_unlock_bh(&table->tb6_lock);
4840
4841 fib6_info_release(f6i);
4842 }
4843
4844 return 0;
4845 }
4846
4847 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4848 struct ifa6_config *cfg)
4849 {
4850 u32 flags;
4851 clock_t expires;
4852 unsigned long timeout;
4853 bool was_managetempaddr;
4854 bool had_prefixroute;
4855 bool new_peer = false;
4856
4857 ASSERT_RTNL();
4858
4859 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4860 return -EINVAL;
4861
4862 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4863 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4864 return -EINVAL;
4865
4866 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4867 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4868
4869 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4870 if (addrconf_finite_timeout(timeout)) {
4871 expires = jiffies_to_clock_t(timeout * HZ);
4872 cfg->valid_lft = timeout;
4873 flags = RTF_EXPIRES;
4874 } else {
4875 expires = 0;
4876 flags = 0;
4877 cfg->ifa_flags |= IFA_F_PERMANENT;
4878 }
4879
4880 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4881 if (addrconf_finite_timeout(timeout)) {
4882 if (timeout == 0)
4883 cfg->ifa_flags |= IFA_F_DEPRECATED;
4884 cfg->preferred_lft = timeout;
4885 }
4886
4887 if (cfg->peer_pfx &&
4888 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4889 if (!ipv6_addr_any(&ifp->peer_addr))
4890 cleanup_prefix_route(ifp, expires, true, true);
4891 new_peer = true;
4892 }
4893
4894 spin_lock_bh(&ifp->lock);
4895 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4896 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4897 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4898 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4899 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4900 IFA_F_NOPREFIXROUTE);
4901 ifp->flags |= cfg->ifa_flags;
4902 WRITE_ONCE(ifp->tstamp, jiffies);
4903 WRITE_ONCE(ifp->valid_lft, cfg->valid_lft);
4904 WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft);
4905 WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto);
4906
4907 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4908 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority);
4909
4910 if (new_peer)
4911 ifp->peer_addr = *cfg->peer_pfx;
4912
4913 spin_unlock_bh(&ifp->lock);
4914 if (!(ifp->flags&IFA_F_TENTATIVE))
4915 ipv6_ifa_notify(0, ifp);
4916
4917 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4918 int rc = -ENOENT;
4919
4920 if (had_prefixroute)
4921 rc = modify_prefix_route(ifp, expires, flags, false);
4922
4923 /* prefix route could have been deleted; if so restore it */
4924 if (rc == -ENOENT) {
4925 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4926 ifp->rt_priority, ifp->idev->dev,
4927 expires, flags, GFP_KERNEL);
4928 }
4929
4930 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4931 rc = modify_prefix_route(ifp, expires, flags, true);
4932
4933 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4934 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4935 ifp->rt_priority, ifp->idev->dev,
4936 expires, flags, GFP_KERNEL);
4937 }
4938 } else if (had_prefixroute) {
4939 enum cleanup_prefix_rt_t action;
4940 unsigned long rt_expires;
4941
4942 write_lock_bh(&ifp->idev->lock);
4943 action = check_cleanup_prefix_route(ifp, &rt_expires);
4944 write_unlock_bh(&ifp->idev->lock);
4945
4946 if (action != CLEANUP_PREFIX_RT_NOP) {
4947 cleanup_prefix_route(ifp, rt_expires,
4948 action == CLEANUP_PREFIX_RT_DEL, false);
4949 }
4950 }
4951
4952 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4953 if (was_managetempaddr &&
4954 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4955 cfg->valid_lft = 0;
4956 cfg->preferred_lft = 0;
4957 }
4958 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4959 cfg->preferred_lft, !was_managetempaddr,
4960 jiffies);
4961 }
4962
4963 addrconf_verify_rtnl(net);
4964
4965 return 0;
4966 }
4967
4968 static int
4969 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4970 struct netlink_ext_ack *extack)
4971 {
4972 struct net *net = sock_net(skb->sk);
4973 struct ifaddrmsg *ifm;
4974 struct nlattr *tb[IFA_MAX+1];
4975 struct in6_addr *peer_pfx;
4976 struct inet6_ifaddr *ifa;
4977 struct net_device *dev;
4978 struct inet6_dev *idev;
4979 struct ifa6_config cfg;
4980 int err;
4981
4982 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4983 ifa_ipv6_policy, extack);
4984 if (err < 0)
4985 return err;
4986
4987 memset(&cfg, 0, sizeof(cfg));
4988
4989 ifm = nlmsg_data(nlh);
4990 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4991 if (!cfg.pfx)
4992 return -EINVAL;
4993
4994 cfg.peer_pfx = peer_pfx;
4995 cfg.plen = ifm->ifa_prefixlen;
4996 if (tb[IFA_RT_PRIORITY])
4997 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4998
4999 if (tb[IFA_PROTO])
5000 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
5001
5002 cfg.valid_lft = INFINITY_LIFE_TIME;
5003 cfg.preferred_lft = INFINITY_LIFE_TIME;
5004
5005 if (tb[IFA_CACHEINFO]) {
5006 struct ifa_cacheinfo *ci;
5007
5008 ci = nla_data(tb[IFA_CACHEINFO]);
5009 cfg.valid_lft = ci->ifa_valid;
5010 cfg.preferred_lft = ci->ifa_prefered;
5011 }
5012
5013 dev = __dev_get_by_index(net, ifm->ifa_index);
5014 if (!dev) {
5015 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
5016 return -ENODEV;
5017 }
5018
5019 if (tb[IFA_FLAGS])
5020 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
5021 else
5022 cfg.ifa_flags = ifm->ifa_flags;
5023
5024 /* We ignore other flags so far. */
5025 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
5026 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
5027 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
5028
5029 idev = ipv6_find_idev(dev);
5030 if (IS_ERR(idev))
5031 return PTR_ERR(idev);
5032
5033 if (!ipv6_allow_optimistic_dad(net, idev))
5034 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
5035
5036 if (cfg.ifa_flags & IFA_F_NODAD &&
5037 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
5038 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
5039 return -EINVAL;
5040 }
5041
5042 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
5043 if (!ifa) {
5044 /*
5045 * It would be best to check for !NLM_F_CREATE here but
5046 * userspace already relies on not having to provide this.
5047 */
5048 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
5049 }
5050
5051 if (nlh->nlmsg_flags & NLM_F_EXCL ||
5052 !(nlh->nlmsg_flags & NLM_F_REPLACE)) {
5053 NL_SET_ERR_MSG_MOD(extack, "address already assigned");
5054 err = -EEXIST;
5055 } else {
5056 err = inet6_addr_modify(net, ifa, &cfg);
5057 }
5058
5059 in6_ifa_put(ifa);
5060
5061 return err;
5062 }
5063
5064 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
5065 u8 scope, int ifindex)
5066 {
5067 struct ifaddrmsg *ifm;
5068
5069 ifm = nlmsg_data(nlh);
5070 ifm->ifa_family = AF_INET6;
5071 ifm->ifa_prefixlen = prefixlen;
5072 ifm->ifa_flags = flags;
5073 ifm->ifa_scope = scope;
5074 ifm->ifa_index = ifindex;
5075 }
5076
5077 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
5078 unsigned long tstamp, u32 preferred, u32 valid)
5079 {
5080 struct ifa_cacheinfo ci;
5081
5082 ci.cstamp = cstamp_delta(cstamp);
5083 ci.tstamp = cstamp_delta(tstamp);
5084 ci.ifa_prefered = preferred;
5085 ci.ifa_valid = valid;
5086
5087 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
5088 }
5089
5090 static inline int rt_scope(int ifa_scope)
5091 {
5092 if (ifa_scope & IFA_HOST)
5093 return RT_SCOPE_HOST;
5094 else if (ifa_scope & IFA_LINK)
5095 return RT_SCOPE_LINK;
5096 else if (ifa_scope & IFA_SITE)
5097 return RT_SCOPE_SITE;
5098 else
5099 return RT_SCOPE_UNIVERSE;
5100 }
5101
5102 static inline int inet6_ifaddr_msgsize(void)
5103 {
5104 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
5105 + nla_total_size(16) /* IFA_LOCAL */
5106 + nla_total_size(16) /* IFA_ADDRESS */
5107 + nla_total_size(sizeof(struct ifa_cacheinfo))
5108 + nla_total_size(4) /* IFA_FLAGS */
5109 + nla_total_size(1) /* IFA_PROTO */
5110 + nla_total_size(4) /* IFA_RT_PRIORITY */;
5111 }
5112
5113 enum addr_type_t {
5114 UNICAST_ADDR,
5115 MULTICAST_ADDR,
5116 ANYCAST_ADDR,
5117 };
5118
5119 struct inet6_fill_args {
5120 u32 portid;
5121 u32 seq;
5122 int event;
5123 unsigned int flags;
5124 int netnsid;
5125 int ifindex;
5126 enum addr_type_t type;
5127 };
5128
5129 static int inet6_fill_ifaddr(struct sk_buff *skb,
5130 const struct inet6_ifaddr *ifa,
5131 struct inet6_fill_args *args)
5132 {
5133 struct nlmsghdr *nlh;
5134 u32 preferred, valid;
5135 u32 flags, priority;
5136 u8 proto;
5137
5138 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5139 sizeof(struct ifaddrmsg), args->flags);
5140 if (!nlh)
5141 return -EMSGSIZE;
5142
5143 flags = READ_ONCE(ifa->flags);
5144 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5145 ifa->idev->dev->ifindex);
5146
5147 if (args->netnsid >= 0 &&
5148 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5149 goto error;
5150
5151 preferred = READ_ONCE(ifa->prefered_lft);
5152 valid = READ_ONCE(ifa->valid_lft);
5153
5154 if (!((flags & IFA_F_PERMANENT) &&
5155 (preferred == INFINITY_LIFE_TIME))) {
5156 if (preferred != INFINITY_LIFE_TIME) {
5157 long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ;
5158
5159 if (preferred > tval)
5160 preferred -= tval;
5161 else
5162 preferred = 0;
5163 if (valid != INFINITY_LIFE_TIME) {
5164 if (valid > tval)
5165 valid -= tval;
5166 else
5167 valid = 0;
5168 }
5169 }
5170 } else {
5171 preferred = INFINITY_LIFE_TIME;
5172 valid = INFINITY_LIFE_TIME;
5173 }
5174
5175 if (!ipv6_addr_any(&ifa->peer_addr)) {
5176 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5177 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5178 goto error;
5179 } else {
5180 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5181 goto error;
5182 }
5183
5184 priority = READ_ONCE(ifa->rt_priority);
5185 if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority))
5186 goto error;
5187
5188 if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp),
5189 preferred, valid) < 0)
5190 goto error;
5191
5192 if (nla_put_u32(skb, IFA_FLAGS, flags) < 0)
5193 goto error;
5194
5195 proto = READ_ONCE(ifa->ifa_proto);
5196 if (proto && nla_put_u8(skb, IFA_PROTO, proto))
5197 goto error;
5198
5199 nlmsg_end(skb, nlh);
5200 return 0;
5201
5202 error:
5203 nlmsg_cancel(skb, nlh);
5204 return -EMSGSIZE;
5205 }
5206
5207 static int inet6_fill_ifmcaddr(struct sk_buff *skb,
5208 const struct ifmcaddr6 *ifmca,
5209 struct inet6_fill_args *args)
5210 {
5211 int ifindex = ifmca->idev->dev->ifindex;
5212 u8 scope = RT_SCOPE_UNIVERSE;
5213 struct nlmsghdr *nlh;
5214
5215 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5216 scope = RT_SCOPE_SITE;
5217
5218 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5219 sizeof(struct ifaddrmsg), args->flags);
5220 if (!nlh)
5221 return -EMSGSIZE;
5222
5223 if (args->netnsid >= 0 &&
5224 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5225 nlmsg_cancel(skb, nlh);
5226 return -EMSGSIZE;
5227 }
5228
5229 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5230 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5231 put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp),
5232 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5233 nlmsg_cancel(skb, nlh);
5234 return -EMSGSIZE;
5235 }
5236
5237 nlmsg_end(skb, nlh);
5238 return 0;
5239 }
5240
5241 static int inet6_fill_ifacaddr(struct sk_buff *skb,
5242 const struct ifacaddr6 *ifaca,
5243 struct inet6_fill_args *args)
5244 {
5245 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5246 int ifindex = dev ? dev->ifindex : 1;
5247 u8 scope = RT_SCOPE_UNIVERSE;
5248 struct nlmsghdr *nlh;
5249
5250 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5251 scope = RT_SCOPE_SITE;
5252
5253 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5254 sizeof(struct ifaddrmsg), args->flags);
5255 if (!nlh)
5256 return -EMSGSIZE;
5257
5258 if (args->netnsid >= 0 &&
5259 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5260 nlmsg_cancel(skb, nlh);
5261 return -EMSGSIZE;
5262 }
5263
5264 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5265 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5266 put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp),
5267 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5268 nlmsg_cancel(skb, nlh);
5269 return -EMSGSIZE;
5270 }
5271
5272 nlmsg_end(skb, nlh);
5273 return 0;
5274 }
5275
5276 /* called with rcu_read_lock() */
5277 static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb,
5278 struct netlink_callback *cb, int *s_ip_idx,
5279 struct inet6_fill_args *fillargs)
5280 {
5281 const struct ifmcaddr6 *ifmca;
5282 const struct ifacaddr6 *ifaca;
5283 int ip_idx = 0;
5284 int err = 0;
5285
5286 switch (fillargs->type) {
5287 case UNICAST_ADDR: {
5288 const struct inet6_ifaddr *ifa;
5289 fillargs->event = RTM_NEWADDR;
5290
5291 /* unicast address incl. temp addr */
5292 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
5293 if (ip_idx < *s_ip_idx)
5294 goto next;
5295 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5296 if (err < 0)
5297 break;
5298 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5299 next:
5300 ip_idx++;
5301 }
5302 break;
5303 }
5304 case MULTICAST_ADDR:
5305 fillargs->event = RTM_GETMULTICAST;
5306
5307 /* multicast address */
5308 for (ifmca = rcu_dereference(idev->mc_list);
5309 ifmca;
5310 ifmca = rcu_dereference(ifmca->next), ip_idx++) {
5311 if (ip_idx < *s_ip_idx)
5312 continue;
5313 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5314 if (err < 0)
5315 break;
5316 }
5317 break;
5318 case ANYCAST_ADDR:
5319 fillargs->event = RTM_GETANYCAST;
5320 /* anycast address */
5321 for (ifaca = rcu_dereference(idev->ac_list); ifaca;
5322 ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) {
5323 if (ip_idx < *s_ip_idx)
5324 continue;
5325 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5326 if (err < 0)
5327 break;
5328 }
5329 break;
5330 default:
5331 break;
5332 }
5333 *s_ip_idx = err ? ip_idx : 0;
5334 return err;
5335 }
5336
5337 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5338 struct inet6_fill_args *fillargs,
5339 struct net **tgt_net, struct sock *sk,
5340 struct netlink_callback *cb)
5341 {
5342 struct netlink_ext_ack *extack = cb->extack;
5343 struct nlattr *tb[IFA_MAX+1];
5344 struct ifaddrmsg *ifm;
5345 int err, i;
5346
5347 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5348 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5349 return -EINVAL;
5350 }
5351
5352 ifm = nlmsg_data(nlh);
5353 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5354 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5355 return -EINVAL;
5356 }
5357
5358 fillargs->ifindex = ifm->ifa_index;
5359 if (fillargs->ifindex) {
5360 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5361 fillargs->flags |= NLM_F_DUMP_FILTERED;
5362 }
5363
5364 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5365 ifa_ipv6_policy, extack);
5366 if (err < 0)
5367 return err;
5368
5369 for (i = 0; i <= IFA_MAX; ++i) {
5370 if (!tb[i])
5371 continue;
5372
5373 if (i == IFA_TARGET_NETNSID) {
5374 struct net *net;
5375
5376 fillargs->netnsid = nla_get_s32(tb[i]);
5377 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5378 if (IS_ERR(net)) {
5379 fillargs->netnsid = -1;
5380 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5381 return PTR_ERR(net);
5382 }
5383 *tgt_net = net;
5384 } else {
5385 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5386 return -EINVAL;
5387 }
5388 }
5389
5390 return 0;
5391 }
5392
5393 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5394 enum addr_type_t type)
5395 {
5396 struct net *tgt_net = sock_net(skb->sk);
5397 const struct nlmsghdr *nlh = cb->nlh;
5398 struct inet6_fill_args fillargs = {
5399 .portid = NETLINK_CB(cb->skb).portid,
5400 .seq = cb->nlh->nlmsg_seq,
5401 .flags = NLM_F_MULTI,
5402 .netnsid = -1,
5403 .type = type,
5404 };
5405 struct {
5406 unsigned long ifindex;
5407 int ip_idx;
5408 } *ctx = (void *)cb->ctx;
5409 struct net_device *dev;
5410 struct inet6_dev *idev;
5411 int err = 0;
5412
5413 rcu_read_lock();
5414 if (cb->strict_check) {
5415 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5416 skb->sk, cb);
5417 if (err < 0)
5418 goto done;
5419
5420 err = 0;
5421 if (fillargs.ifindex) {
5422 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex);
5423 if (!dev) {
5424 err = -ENODEV;
5425 goto done;
5426 }
5427 idev = __in6_dev_get(dev);
5428 if (idev)
5429 err = in6_dump_addrs(idev, skb, cb,
5430 &ctx->ip_idx,
5431 &fillargs);
5432 goto done;
5433 }
5434 }
5435
5436 cb->seq = inet6_base_seq(tgt_net);
5437 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) {
5438 idev = __in6_dev_get(dev);
5439 if (!idev)
5440 continue;
5441 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx,
5442 &fillargs);
5443 if (err < 0)
5444 goto done;
5445 }
5446 done:
5447 rcu_read_unlock();
5448 if (fillargs.netnsid >= 0)
5449 put_net(tgt_net);
5450
5451 return err;
5452 }
5453
5454 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5455 {
5456 enum addr_type_t type = UNICAST_ADDR;
5457
5458 return inet6_dump_addr(skb, cb, type);
5459 }
5460
5461 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5462 {
5463 enum addr_type_t type = MULTICAST_ADDR;
5464
5465 return inet6_dump_addr(skb, cb, type);
5466 }
5467
5468
5469 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5470 {
5471 enum addr_type_t type = ANYCAST_ADDR;
5472
5473 return inet6_dump_addr(skb, cb, type);
5474 }
5475
5476 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5477 const struct nlmsghdr *nlh,
5478 struct nlattr **tb,
5479 struct netlink_ext_ack *extack)
5480 {
5481 struct ifaddrmsg *ifm;
5482 int i, err;
5483
5484 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5485 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5486 return -EINVAL;
5487 }
5488
5489 if (!netlink_strict_get_check(skb))
5490 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5491 ifa_ipv6_policy, extack);
5492
5493 ifm = nlmsg_data(nlh);
5494 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5495 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5496 return -EINVAL;
5497 }
5498
5499 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5500 ifa_ipv6_policy, extack);
5501 if (err)
5502 return err;
5503
5504 for (i = 0; i <= IFA_MAX; i++) {
5505 if (!tb[i])
5506 continue;
5507
5508 switch (i) {
5509 case IFA_TARGET_NETNSID:
5510 case IFA_ADDRESS:
5511 case IFA_LOCAL:
5512 break;
5513 default:
5514 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5515 return -EINVAL;
5516 }
5517 }
5518
5519 return 0;
5520 }
5521
5522 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5523 struct netlink_ext_ack *extack)
5524 {
5525 struct net *tgt_net = sock_net(in_skb->sk);
5526 struct inet6_fill_args fillargs = {
5527 .portid = NETLINK_CB(in_skb).portid,
5528 .seq = nlh->nlmsg_seq,
5529 .event = RTM_NEWADDR,
5530 .flags = 0,
5531 .netnsid = -1,
5532 };
5533 struct ifaddrmsg *ifm;
5534 struct nlattr *tb[IFA_MAX+1];
5535 struct in6_addr *addr = NULL, *peer;
5536 struct net_device *dev = NULL;
5537 struct inet6_ifaddr *ifa;
5538 struct sk_buff *skb;
5539 int err;
5540
5541 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5542 if (err < 0)
5543 return err;
5544
5545 if (tb[IFA_TARGET_NETNSID]) {
5546 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5547
5548 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5549 fillargs.netnsid);
5550 if (IS_ERR(tgt_net))
5551 return PTR_ERR(tgt_net);
5552 }
5553
5554 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5555 if (!addr) {
5556 err = -EINVAL;
5557 goto errout;
5558 }
5559 ifm = nlmsg_data(nlh);
5560 if (ifm->ifa_index)
5561 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5562
5563 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5564 if (!ifa) {
5565 err = -EADDRNOTAVAIL;
5566 goto errout;
5567 }
5568
5569 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5570 if (!skb) {
5571 err = -ENOBUFS;
5572 goto errout_ifa;
5573 }
5574
5575 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5576 if (err < 0) {
5577 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5578 WARN_ON(err == -EMSGSIZE);
5579 kfree_skb(skb);
5580 goto errout_ifa;
5581 }
5582 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5583 errout_ifa:
5584 in6_ifa_put(ifa);
5585 errout:
5586 dev_put(dev);
5587 if (fillargs.netnsid >= 0)
5588 put_net(tgt_net);
5589
5590 return err;
5591 }
5592
5593 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5594 {
5595 struct sk_buff *skb;
5596 struct net *net = dev_net(ifa->idev->dev);
5597 struct inet6_fill_args fillargs = {
5598 .portid = 0,
5599 .seq = 0,
5600 .event = event,
5601 .flags = 0,
5602 .netnsid = -1,
5603 };
5604 int err = -ENOBUFS;
5605
5606 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5607 if (!skb)
5608 goto errout;
5609
5610 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5611 if (err < 0) {
5612 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5613 WARN_ON(err == -EMSGSIZE);
5614 kfree_skb(skb);
5615 goto errout;
5616 }
5617 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5618 return;
5619 errout:
5620 if (err < 0)
5621 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5622 }
5623
5624 static void ipv6_store_devconf(const struct ipv6_devconf *cnf,
5625 __s32 *array, int bytes)
5626 {
5627 BUG_ON(bytes < (DEVCONF_MAX * 4));
5628
5629 memset(array, 0, bytes);
5630 array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding);
5631 array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit);
5632 array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6);
5633 array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra);
5634 array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects);
5635 array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf);
5636 array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits);
5637 array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits);
5638 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5639 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval));
5640 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5641 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval));
5642 array[DEVCONF_RTR_SOLICIT_DELAY] =
5643 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay));
5644 array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version);
5645 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5646 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval));
5647 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5648 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval));
5649 array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr);
5650 array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft);
5651 array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft);
5652 array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry);
5653 array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor);
5654 array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses);
5655 array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr);
5656 array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric);
5657 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] =
5658 READ_ONCE(cnf->accept_ra_min_hop_limit);
5659 array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo);
5660 #ifdef CONFIG_IPV6_ROUTER_PREF
5661 array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref);
5662 array[DEVCONF_RTR_PROBE_INTERVAL] =
5663 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval));
5664 #ifdef CONFIG_IPV6_ROUTE_INFO
5665 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] =
5666 READ_ONCE(cnf->accept_ra_rt_info_min_plen);
5667 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] =
5668 READ_ONCE(cnf->accept_ra_rt_info_max_plen);
5669 #endif
5670 #endif
5671 array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp);
5672 array[DEVCONF_ACCEPT_SOURCE_ROUTE] =
5673 READ_ONCE(cnf->accept_source_route);
5674 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5675 array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad);
5676 array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic);
5677 #endif
5678 #ifdef CONFIG_IPV6_MROUTE
5679 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5680 #endif
5681 array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6);
5682 array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad);
5683 array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao);
5684 array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify);
5685 array[DEVCONF_SUPPRESS_FRAG_NDISC] =
5686 READ_ONCE(cnf->suppress_frag_ndisc);
5687 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] =
5688 READ_ONCE(cnf->accept_ra_from_local);
5689 array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu);
5690 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] =
5691 READ_ONCE(cnf->ignore_routes_with_linkdown);
5692 /* we omit DEVCONF_STABLE_SECRET for now */
5693 array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only);
5694 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] =
5695 READ_ONCE(cnf->drop_unicast_in_l2_multicast);
5696 array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na);
5697 array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down);
5698 array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled);
5699 #ifdef CONFIG_IPV6_SEG6_HMAC
5700 array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac);
5701 #endif
5702 array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad);
5703 array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode);
5704 array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy);
5705 array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass);
5706 array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled);
5707 array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled);
5708 array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id);
5709 array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide);
5710 array[DEVCONF_NDISC_EVICT_NOCARRIER] =
5711 READ_ONCE(cnf->ndisc_evict_nocarrier);
5712 array[DEVCONF_ACCEPT_UNTRACKED_NA] =
5713 READ_ONCE(cnf->accept_untracked_na);
5714 array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft);
5715 }
5716
5717 static inline size_t inet6_ifla6_size(void)
5718 {
5719 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5720 + nla_total_size(sizeof(struct ifla_cacheinfo))
5721 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5722 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5723 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5724 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5725 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5726 + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5727 + 0;
5728 }
5729
5730 static inline size_t inet6_if_nlmsg_size(void)
5731 {
5732 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5733 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5734 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5735 + nla_total_size(4) /* IFLA_MTU */
5736 + nla_total_size(4) /* IFLA_LINK */
5737 + nla_total_size(1) /* IFLA_OPERSTATE */
5738 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5739 }
5740
5741 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5742 int bytes)
5743 {
5744 int i;
5745 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5746 BUG_ON(pad < 0);
5747
5748 /* Use put_unaligned() because stats may not be aligned for u64. */
5749 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5750 for (i = 1; i < ICMP6_MIB_MAX; i++)
5751 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5752
5753 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5754 }
5755
5756 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5757 int bytes, size_t syncpoff)
5758 {
5759 int i, c;
5760 u64 buff[IPSTATS_MIB_MAX];
5761 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5762
5763 BUG_ON(pad < 0);
5764
5765 memset(buff, 0, sizeof(buff));
5766 buff[0] = IPSTATS_MIB_MAX;
5767
5768 for_each_possible_cpu(c) {
5769 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5770 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5771 }
5772
5773 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5774 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5775 }
5776
5777 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5778 int bytes)
5779 {
5780 switch (attrtype) {
5781 case IFLA_INET6_STATS:
5782 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5783 offsetof(struct ipstats_mib, syncp));
5784 break;
5785 case IFLA_INET6_ICMP6STATS:
5786 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5787 break;
5788 }
5789 }
5790
5791 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5792 u32 ext_filter_mask)
5793 {
5794 struct ifla_cacheinfo ci;
5795 struct nlattr *nla;
5796 u32 ra_mtu;
5797
5798 if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags)))
5799 goto nla_put_failure;
5800 ci.max_reasm_len = IPV6_MAXPLEN;
5801 ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp));
5802 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5803 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5804 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5805 goto nla_put_failure;
5806 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5807 if (!nla)
5808 goto nla_put_failure;
5809 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5810
5811 /* XXX - MC not implemented */
5812
5813 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5814 return 0;
5815
5816 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5817 if (!nla)
5818 goto nla_put_failure;
5819 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5820
5821 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5822 if (!nla)
5823 goto nla_put_failure;
5824 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5825
5826 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5827 if (!nla)
5828 goto nla_put_failure;
5829 read_lock_bh(&idev->lock);
5830 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5831 read_unlock_bh(&idev->lock);
5832
5833 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE,
5834 READ_ONCE(idev->cnf.addr_gen_mode)))
5835 goto nla_put_failure;
5836
5837 ra_mtu = READ_ONCE(idev->ra_mtu);
5838 if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu))
5839 goto nla_put_failure;
5840
5841 return 0;
5842
5843 nla_put_failure:
5844 return -EMSGSIZE;
5845 }
5846
5847 static size_t inet6_get_link_af_size(const struct net_device *dev,
5848 u32 ext_filter_mask)
5849 {
5850 if (!__in6_dev_get(dev))
5851 return 0;
5852
5853 return inet6_ifla6_size();
5854 }
5855
5856 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5857 u32 ext_filter_mask)
5858 {
5859 struct inet6_dev *idev = __in6_dev_get(dev);
5860
5861 if (!idev)
5862 return -ENODATA;
5863
5864 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5865 return -EMSGSIZE;
5866
5867 return 0;
5868 }
5869
5870 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5871 struct netlink_ext_ack *extack)
5872 {
5873 struct inet6_ifaddr *ifp;
5874 struct net_device *dev = idev->dev;
5875 bool clear_token, update_rs = false;
5876 struct in6_addr ll_addr;
5877
5878 ASSERT_RTNL();
5879
5880 if (!token)
5881 return -EINVAL;
5882
5883 if (dev->flags & IFF_LOOPBACK) {
5884 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5885 return -EINVAL;
5886 }
5887
5888 if (dev->flags & IFF_NOARP) {
5889 NL_SET_ERR_MSG_MOD(extack,
5890 "Device does not do neighbour discovery");
5891 return -EINVAL;
5892 }
5893
5894 if (!ipv6_accept_ra(idev)) {
5895 NL_SET_ERR_MSG_MOD(extack,
5896 "Router advertisement is disabled on device");
5897 return -EINVAL;
5898 }
5899
5900 if (READ_ONCE(idev->cnf.rtr_solicits) == 0) {
5901 NL_SET_ERR_MSG(extack,
5902 "Router solicitation is disabled on device");
5903 return -EINVAL;
5904 }
5905
5906 write_lock_bh(&idev->lock);
5907
5908 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5909 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5910
5911 write_unlock_bh(&idev->lock);
5912
5913 clear_token = ipv6_addr_any(token);
5914 if (clear_token)
5915 goto update_lft;
5916
5917 if (!idev->dead && (idev->if_flags & IF_READY) &&
5918 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5919 IFA_F_OPTIMISTIC)) {
5920 /* If we're not ready, then normal ifup will take care
5921 * of this. Otherwise, we need to request our rs here.
5922 */
5923 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5924 update_rs = true;
5925 }
5926
5927 update_lft:
5928 write_lock_bh(&idev->lock);
5929
5930 if (update_rs) {
5931 idev->if_flags |= IF_RS_SENT;
5932 idev->rs_interval = rfc3315_s14_backoff_init(
5933 READ_ONCE(idev->cnf.rtr_solicit_interval));
5934 idev->rs_probes = 1;
5935 addrconf_mod_rs_timer(idev, idev->rs_interval);
5936 }
5937
5938 /* Well, that's kinda nasty ... */
5939 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5940 spin_lock(&ifp->lock);
5941 if (ifp->tokenized) {
5942 ifp->valid_lft = 0;
5943 ifp->prefered_lft = 0;
5944 }
5945 spin_unlock(&ifp->lock);
5946 }
5947
5948 write_unlock_bh(&idev->lock);
5949 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5950 addrconf_verify_rtnl(dev_net(dev));
5951 return 0;
5952 }
5953
5954 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5955 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5956 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5957 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5958 .reject_message =
5959 "IFLA_INET6_RA_MTU can not be set" },
5960 };
5961
5962 static int check_addr_gen_mode(int mode)
5963 {
5964 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5965 mode != IN6_ADDR_GEN_MODE_NONE &&
5966 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5967 mode != IN6_ADDR_GEN_MODE_RANDOM)
5968 return -EINVAL;
5969 return 1;
5970 }
5971
5972 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5973 int mode)
5974 {
5975 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5976 !idev->cnf.stable_secret.initialized &&
5977 !net->ipv6.devconf_dflt->stable_secret.initialized)
5978 return -EINVAL;
5979 return 1;
5980 }
5981
5982 static int inet6_validate_link_af(const struct net_device *dev,
5983 const struct nlattr *nla,
5984 struct netlink_ext_ack *extack)
5985 {
5986 struct nlattr *tb[IFLA_INET6_MAX + 1];
5987 struct inet6_dev *idev = NULL;
5988 int err;
5989
5990 if (dev) {
5991 idev = __in6_dev_get(dev);
5992 if (!idev)
5993 return -EAFNOSUPPORT;
5994 }
5995
5996 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5997 inet6_af_policy, extack);
5998 if (err)
5999 return err;
6000
6001 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
6002 return -EINVAL;
6003
6004 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6005 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6006
6007 if (check_addr_gen_mode(mode) < 0)
6008 return -EINVAL;
6009 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
6010 return -EINVAL;
6011 }
6012
6013 return 0;
6014 }
6015
6016 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
6017 struct netlink_ext_ack *extack)
6018 {
6019 struct inet6_dev *idev = __in6_dev_get(dev);
6020 struct nlattr *tb[IFLA_INET6_MAX + 1];
6021 int err;
6022
6023 if (!idev)
6024 return -EAFNOSUPPORT;
6025
6026 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
6027 return -EINVAL;
6028
6029 if (tb[IFLA_INET6_TOKEN]) {
6030 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
6031 extack);
6032 if (err)
6033 return err;
6034 }
6035
6036 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6037 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6038
6039 WRITE_ONCE(idev->cnf.addr_gen_mode, mode);
6040 }
6041
6042 return 0;
6043 }
6044
6045 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
6046 u32 portid, u32 seq, int event, unsigned int flags)
6047 {
6048 struct net_device *dev = idev->dev;
6049 struct ifinfomsg *hdr;
6050 struct nlmsghdr *nlh;
6051 int ifindex, iflink;
6052 void *protoinfo;
6053
6054 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
6055 if (!nlh)
6056 return -EMSGSIZE;
6057
6058 hdr = nlmsg_data(nlh);
6059 hdr->ifi_family = AF_INET6;
6060 hdr->__ifi_pad = 0;
6061 hdr->ifi_type = dev->type;
6062 ifindex = READ_ONCE(dev->ifindex);
6063 hdr->ifi_index = ifindex;
6064 hdr->ifi_flags = dev_get_flags(dev);
6065 hdr->ifi_change = 0;
6066
6067 iflink = dev_get_iflink(dev);
6068 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
6069 (dev->addr_len &&
6070 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
6071 nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) ||
6072 (ifindex != iflink &&
6073 nla_put_u32(skb, IFLA_LINK, iflink)) ||
6074 nla_put_u8(skb, IFLA_OPERSTATE,
6075 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN))
6076 goto nla_put_failure;
6077 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
6078 if (!protoinfo)
6079 goto nla_put_failure;
6080
6081 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
6082 goto nla_put_failure;
6083
6084 nla_nest_end(skb, protoinfo);
6085 nlmsg_end(skb, nlh);
6086 return 0;
6087
6088 nla_put_failure:
6089 nlmsg_cancel(skb, nlh);
6090 return -EMSGSIZE;
6091 }
6092
6093 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
6094 struct netlink_ext_ack *extack)
6095 {
6096 struct ifinfomsg *ifm;
6097
6098 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
6099 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
6100 return -EINVAL;
6101 }
6102
6103 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
6104 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
6105 return -EINVAL;
6106 }
6107
6108 ifm = nlmsg_data(nlh);
6109 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
6110 ifm->ifi_change || ifm->ifi_index) {
6111 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
6112 return -EINVAL;
6113 }
6114
6115 return 0;
6116 }
6117
6118 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
6119 {
6120 struct net *net = sock_net(skb->sk);
6121 struct {
6122 unsigned long ifindex;
6123 } *ctx = (void *)cb->ctx;
6124 struct net_device *dev;
6125 struct inet6_dev *idev;
6126 int err;
6127
6128 /* only requests using strict checking can pass data to
6129 * influence the dump
6130 */
6131 if (cb->strict_check) {
6132 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6133
6134 if (err < 0)
6135 return err;
6136 }
6137
6138 err = 0;
6139 rcu_read_lock();
6140 for_each_netdev_dump(net, dev, ctx->ifindex) {
6141 idev = __in6_dev_get(dev);
6142 if (!idev)
6143 continue;
6144 err = inet6_fill_ifinfo(skb, idev,
6145 NETLINK_CB(cb->skb).portid,
6146 cb->nlh->nlmsg_seq,
6147 RTM_NEWLINK, NLM_F_MULTI);
6148 if (err < 0)
6149 break;
6150 }
6151 rcu_read_unlock();
6152
6153 return err;
6154 }
6155
6156 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6157 {
6158 struct sk_buff *skb;
6159 struct net *net = dev_net(idev->dev);
6160 int err = -ENOBUFS;
6161
6162 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6163 if (!skb)
6164 goto errout;
6165
6166 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6167 if (err < 0) {
6168 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6169 WARN_ON(err == -EMSGSIZE);
6170 kfree_skb(skb);
6171 goto errout;
6172 }
6173 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6174 return;
6175 errout:
6176 if (err < 0)
6177 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6178 }
6179
6180 static inline size_t inet6_prefix_nlmsg_size(void)
6181 {
6182 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6183 + nla_total_size(sizeof(struct in6_addr))
6184 + nla_total_size(sizeof(struct prefix_cacheinfo));
6185 }
6186
6187 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6188 struct prefix_info *pinfo, u32 portid, u32 seq,
6189 int event, unsigned int flags)
6190 {
6191 struct prefixmsg *pmsg;
6192 struct nlmsghdr *nlh;
6193 struct prefix_cacheinfo ci;
6194
6195 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6196 if (!nlh)
6197 return -EMSGSIZE;
6198
6199 pmsg = nlmsg_data(nlh);
6200 pmsg->prefix_family = AF_INET6;
6201 pmsg->prefix_pad1 = 0;
6202 pmsg->prefix_pad2 = 0;
6203 pmsg->prefix_ifindex = idev->dev->ifindex;
6204 pmsg->prefix_len = pinfo->prefix_len;
6205 pmsg->prefix_type = pinfo->type;
6206 pmsg->prefix_pad3 = 0;
6207 pmsg->prefix_flags = pinfo->flags;
6208
6209 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6210 goto nla_put_failure;
6211 ci.preferred_time = ntohl(pinfo->prefered);
6212 ci.valid_time = ntohl(pinfo->valid);
6213 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6214 goto nla_put_failure;
6215 nlmsg_end(skb, nlh);
6216 return 0;
6217
6218 nla_put_failure:
6219 nlmsg_cancel(skb, nlh);
6220 return -EMSGSIZE;
6221 }
6222
6223 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6224 struct prefix_info *pinfo)
6225 {
6226 struct sk_buff *skb;
6227 struct net *net = dev_net(idev->dev);
6228 int err = -ENOBUFS;
6229
6230 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6231 if (!skb)
6232 goto errout;
6233
6234 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6235 if (err < 0) {
6236 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6237 WARN_ON(err == -EMSGSIZE);
6238 kfree_skb(skb);
6239 goto errout;
6240 }
6241 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6242 return;
6243 errout:
6244 if (err < 0)
6245 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6246 }
6247
6248 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6249 {
6250 struct net *net = dev_net(ifp->idev->dev);
6251
6252 if (event)
6253 ASSERT_RTNL();
6254
6255 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6256
6257 switch (event) {
6258 case RTM_NEWADDR:
6259 /*
6260 * If the address was optimistic we inserted the route at the
6261 * start of our DAD process, so we don't need to do it again.
6262 * If the device was taken down in the middle of the DAD
6263 * cycle there is a race where we could get here without a
6264 * host route, so nothing to insert. That will be fixed when
6265 * the device is brought up.
6266 */
6267 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6268 ip6_ins_rt(net, ifp->rt);
6269 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6270 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6271 &ifp->addr, ifp->idev->dev->name);
6272 }
6273
6274 if (ifp->idev->cnf.forwarding)
6275 addrconf_join_anycast(ifp);
6276 if (!ipv6_addr_any(&ifp->peer_addr))
6277 addrconf_prefix_route(&ifp->peer_addr, 128,
6278 ifp->rt_priority, ifp->idev->dev,
6279 0, 0, GFP_ATOMIC);
6280 break;
6281 case RTM_DELADDR:
6282 if (ifp->idev->cnf.forwarding)
6283 addrconf_leave_anycast(ifp);
6284 addrconf_leave_solict(ifp->idev, &ifp->addr);
6285 if (!ipv6_addr_any(&ifp->peer_addr)) {
6286 struct fib6_info *rt;
6287
6288 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6289 ifp->idev->dev, 0, 0,
6290 false);
6291 if (rt)
6292 ip6_del_rt(net, rt, false);
6293 }
6294 if (ifp->rt) {
6295 ip6_del_rt(net, ifp->rt, false);
6296 ifp->rt = NULL;
6297 }
6298 rt_genid_bump_ipv6(net);
6299 break;
6300 }
6301 atomic_inc(&net->ipv6.dev_addr_genid);
6302 }
6303
6304 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6305 {
6306 if (likely(ifp->idev->dead == 0))
6307 __ipv6_ifa_notify(event, ifp);
6308 }
6309
6310 #ifdef CONFIG_SYSCTL
6311
6312 static int addrconf_sysctl_forward(const struct ctl_table *ctl, int write,
6313 void *buffer, size_t *lenp, loff_t *ppos)
6314 {
6315 int *valp = ctl->data;
6316 int val = *valp;
6317 loff_t pos = *ppos;
6318 struct ctl_table lctl;
6319 int ret;
6320
6321 /*
6322 * ctl->data points to idev->cnf.forwarding, we should
6323 * not modify it until we get the rtnl lock.
6324 */
6325 lctl = *ctl;
6326 lctl.data = &val;
6327
6328 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6329
6330 if (write)
6331 ret = addrconf_fixup_forwarding(ctl, valp, val);
6332 if (ret)
6333 *ppos = pos;
6334 return ret;
6335 }
6336
6337 static int addrconf_sysctl_mtu(const struct ctl_table *ctl, int write,
6338 void *buffer, size_t *lenp, loff_t *ppos)
6339 {
6340 struct inet6_dev *idev = ctl->extra1;
6341 int min_mtu = IPV6_MIN_MTU;
6342 struct ctl_table lctl;
6343
6344 lctl = *ctl;
6345 lctl.extra1 = &min_mtu;
6346 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6347
6348 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6349 }
6350
6351 static void dev_disable_change(struct inet6_dev *idev)
6352 {
6353 struct netdev_notifier_info info;
6354
6355 if (!idev || !idev->dev)
6356 return;
6357
6358 netdev_notifier_info_init(&info, idev->dev);
6359 if (idev->cnf.disable_ipv6)
6360 addrconf_notify(NULL, NETDEV_DOWN, &info);
6361 else
6362 addrconf_notify(NULL, NETDEV_UP, &info);
6363 }
6364
6365 static void addrconf_disable_change(struct net *net, __s32 newf)
6366 {
6367 struct net_device *dev;
6368 struct inet6_dev *idev;
6369
6370 for_each_netdev(net, dev) {
6371 idev = __in6_dev_get(dev);
6372 if (idev) {
6373 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6374
6375 WRITE_ONCE(idev->cnf.disable_ipv6, newf);
6376 if (changed)
6377 dev_disable_change(idev);
6378 }
6379 }
6380 }
6381
6382 static int addrconf_disable_ipv6(const struct ctl_table *table, int *p, int newf)
6383 {
6384 struct net *net = (struct net *)table->extra2;
6385 int old;
6386
6387 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6388 WRITE_ONCE(*p, newf);
6389 return 0;
6390 }
6391
6392 if (!rtnl_trylock())
6393 return restart_syscall();
6394
6395 old = *p;
6396 WRITE_ONCE(*p, newf);
6397
6398 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6399 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf);
6400 addrconf_disable_change(net, newf);
6401 } else if ((!newf) ^ (!old))
6402 dev_disable_change((struct inet6_dev *)table->extra1);
6403
6404 rtnl_unlock();
6405 return 0;
6406 }
6407
6408 static int addrconf_sysctl_disable(const struct ctl_table *ctl, int write,
6409 void *buffer, size_t *lenp, loff_t *ppos)
6410 {
6411 int *valp = ctl->data;
6412 int val = *valp;
6413 loff_t pos = *ppos;
6414 struct ctl_table lctl;
6415 int ret;
6416
6417 /*
6418 * ctl->data points to idev->cnf.disable_ipv6, we should
6419 * not modify it until we get the rtnl lock.
6420 */
6421 lctl = *ctl;
6422 lctl.data = &val;
6423
6424 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6425
6426 if (write)
6427 ret = addrconf_disable_ipv6(ctl, valp, val);
6428 if (ret)
6429 *ppos = pos;
6430 return ret;
6431 }
6432
6433 static int addrconf_sysctl_proxy_ndp(const struct ctl_table *ctl, int write,
6434 void *buffer, size_t *lenp, loff_t *ppos)
6435 {
6436 int *valp = ctl->data;
6437 int ret;
6438 int old, new;
6439
6440 old = *valp;
6441 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6442 new = *valp;
6443
6444 if (write && old != new) {
6445 struct net *net = ctl->extra2;
6446
6447 if (!rtnl_trylock())
6448 return restart_syscall();
6449
6450 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6451 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6452 NETCONFA_PROXY_NEIGH,
6453 NETCONFA_IFINDEX_DEFAULT,
6454 net->ipv6.devconf_dflt);
6455 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6456 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6457 NETCONFA_PROXY_NEIGH,
6458 NETCONFA_IFINDEX_ALL,
6459 net->ipv6.devconf_all);
6460 else {
6461 struct inet6_dev *idev = ctl->extra1;
6462
6463 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6464 NETCONFA_PROXY_NEIGH,
6465 idev->dev->ifindex,
6466 &idev->cnf);
6467 }
6468 rtnl_unlock();
6469 }
6470
6471 return ret;
6472 }
6473
6474 static int addrconf_sysctl_addr_gen_mode(const struct ctl_table *ctl, int write,
6475 void *buffer, size_t *lenp,
6476 loff_t *ppos)
6477 {
6478 int ret = 0;
6479 u32 new_val;
6480 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6481 struct net *net = (struct net *)ctl->extra2;
6482 struct ctl_table tmp = {
6483 .data = &new_val,
6484 .maxlen = sizeof(new_val),
6485 .mode = ctl->mode,
6486 };
6487
6488 if (!rtnl_trylock())
6489 return restart_syscall();
6490
6491 new_val = *((u32 *)ctl->data);
6492
6493 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6494 if (ret != 0)
6495 goto out;
6496
6497 if (write) {
6498 if (check_addr_gen_mode(new_val) < 0) {
6499 ret = -EINVAL;
6500 goto out;
6501 }
6502
6503 if (idev) {
6504 if (check_stable_privacy(idev, net, new_val) < 0) {
6505 ret = -EINVAL;
6506 goto out;
6507 }
6508
6509 if (idev->cnf.addr_gen_mode != new_val) {
6510 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val);
6511 addrconf_init_auto_addrs(idev->dev);
6512 }
6513 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6514 struct net_device *dev;
6515
6516 WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val);
6517 for_each_netdev(net, dev) {
6518 idev = __in6_dev_get(dev);
6519 if (idev &&
6520 idev->cnf.addr_gen_mode != new_val) {
6521 WRITE_ONCE(idev->cnf.addr_gen_mode,
6522 new_val);
6523 addrconf_init_auto_addrs(idev->dev);
6524 }
6525 }
6526 }
6527
6528 WRITE_ONCE(*((u32 *)ctl->data), new_val);
6529 }
6530
6531 out:
6532 rtnl_unlock();
6533
6534 return ret;
6535 }
6536
6537 static int addrconf_sysctl_stable_secret(const struct ctl_table *ctl, int write,
6538 void *buffer, size_t *lenp,
6539 loff_t *ppos)
6540 {
6541 int err;
6542 struct in6_addr addr;
6543 char str[IPV6_MAX_STRLEN];
6544 struct ctl_table lctl = *ctl;
6545 struct net *net = ctl->extra2;
6546 struct ipv6_stable_secret *secret = ctl->data;
6547
6548 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6549 return -EIO;
6550
6551 lctl.maxlen = IPV6_MAX_STRLEN;
6552 lctl.data = str;
6553
6554 if (!rtnl_trylock())
6555 return restart_syscall();
6556
6557 if (!write && !secret->initialized) {
6558 err = -EIO;
6559 goto out;
6560 }
6561
6562 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6563 if (err >= sizeof(str)) {
6564 err = -EIO;
6565 goto out;
6566 }
6567
6568 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6569 if (err || !write)
6570 goto out;
6571
6572 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6573 err = -EIO;
6574 goto out;
6575 }
6576
6577 secret->initialized = true;
6578 secret->secret = addr;
6579
6580 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6581 struct net_device *dev;
6582
6583 for_each_netdev(net, dev) {
6584 struct inet6_dev *idev = __in6_dev_get(dev);
6585
6586 if (idev) {
6587 WRITE_ONCE(idev->cnf.addr_gen_mode,
6588 IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6589 }
6590 }
6591 } else {
6592 struct inet6_dev *idev = ctl->extra1;
6593
6594 WRITE_ONCE(idev->cnf.addr_gen_mode,
6595 IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6596 }
6597
6598 out:
6599 rtnl_unlock();
6600
6601 return err;
6602 }
6603
6604 static
6605 int addrconf_sysctl_ignore_routes_with_linkdown(const struct ctl_table *ctl,
6606 int write, void *buffer,
6607 size_t *lenp,
6608 loff_t *ppos)
6609 {
6610 int *valp = ctl->data;
6611 int val = *valp;
6612 loff_t pos = *ppos;
6613 struct ctl_table lctl;
6614 int ret;
6615
6616 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6617 * we should not modify it until we get the rtnl lock.
6618 */
6619 lctl = *ctl;
6620 lctl.data = &val;
6621
6622 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6623
6624 if (write)
6625 ret = addrconf_fixup_linkdown(ctl, valp, val);
6626 if (ret)
6627 *ppos = pos;
6628 return ret;
6629 }
6630
6631 static
6632 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6633 {
6634 if (rt) {
6635 if (action)
6636 rt->dst.flags |= DST_NOPOLICY;
6637 else
6638 rt->dst.flags &= ~DST_NOPOLICY;
6639 }
6640 }
6641
6642 static
6643 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6644 {
6645 struct inet6_ifaddr *ifa;
6646
6647 read_lock_bh(&idev->lock);
6648 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6649 spin_lock(&ifa->lock);
6650 if (ifa->rt) {
6651 /* host routes only use builtin fib6_nh */
6652 struct fib6_nh *nh = ifa->rt->fib6_nh;
6653 int cpu;
6654
6655 rcu_read_lock();
6656 ifa->rt->dst_nopolicy = val ? true : false;
6657 if (nh->rt6i_pcpu) {
6658 for_each_possible_cpu(cpu) {
6659 struct rt6_info **rtp;
6660
6661 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6662 addrconf_set_nopolicy(*rtp, val);
6663 }
6664 }
6665 rcu_read_unlock();
6666 }
6667 spin_unlock(&ifa->lock);
6668 }
6669 read_unlock_bh(&idev->lock);
6670 }
6671
6672 static
6673 int addrconf_disable_policy(const struct ctl_table *ctl, int *valp, int val)
6674 {
6675 struct net *net = (struct net *)ctl->extra2;
6676 struct inet6_dev *idev;
6677
6678 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6679 WRITE_ONCE(*valp, val);
6680 return 0;
6681 }
6682
6683 if (!rtnl_trylock())
6684 return restart_syscall();
6685
6686 WRITE_ONCE(*valp, val);
6687
6688 if (valp == &net->ipv6.devconf_all->disable_policy) {
6689 struct net_device *dev;
6690
6691 for_each_netdev(net, dev) {
6692 idev = __in6_dev_get(dev);
6693 if (idev)
6694 addrconf_disable_policy_idev(idev, val);
6695 }
6696 } else {
6697 idev = (struct inet6_dev *)ctl->extra1;
6698 addrconf_disable_policy_idev(idev, val);
6699 }
6700
6701 rtnl_unlock();
6702 return 0;
6703 }
6704
6705 static int addrconf_sysctl_disable_policy(const struct ctl_table *ctl, int write,
6706 void *buffer, size_t *lenp, loff_t *ppos)
6707 {
6708 int *valp = ctl->data;
6709 int val = *valp;
6710 loff_t pos = *ppos;
6711 struct ctl_table lctl;
6712 int ret;
6713
6714 lctl = *ctl;
6715 lctl.data = &val;
6716 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6717
6718 if (write && (*valp != val))
6719 ret = addrconf_disable_policy(ctl, valp, val);
6720
6721 if (ret)
6722 *ppos = pos;
6723
6724 return ret;
6725 }
6726
6727 static int minus_one = -1;
6728 static const int two_five_five = 255;
6729 static u32 ioam6_if_id_max = U16_MAX;
6730
6731 static const struct ctl_table addrconf_sysctl[] = {
6732 {
6733 .procname = "forwarding",
6734 .data = &ipv6_devconf.forwarding,
6735 .maxlen = sizeof(int),
6736 .mode = 0644,
6737 .proc_handler = addrconf_sysctl_forward,
6738 },
6739 {
6740 .procname = "hop_limit",
6741 .data = &ipv6_devconf.hop_limit,
6742 .maxlen = sizeof(int),
6743 .mode = 0644,
6744 .proc_handler = proc_dointvec_minmax,
6745 .extra1 = (void *)SYSCTL_ONE,
6746 .extra2 = (void *)&two_five_five,
6747 },
6748 {
6749 .procname = "mtu",
6750 .data = &ipv6_devconf.mtu6,
6751 .maxlen = sizeof(int),
6752 .mode = 0644,
6753 .proc_handler = addrconf_sysctl_mtu,
6754 },
6755 {
6756 .procname = "accept_ra",
6757 .data = &ipv6_devconf.accept_ra,
6758 .maxlen = sizeof(int),
6759 .mode = 0644,
6760 .proc_handler = proc_dointvec,
6761 },
6762 {
6763 .procname = "accept_redirects",
6764 .data = &ipv6_devconf.accept_redirects,
6765 .maxlen = sizeof(int),
6766 .mode = 0644,
6767 .proc_handler = proc_dointvec,
6768 },
6769 {
6770 .procname = "autoconf",
6771 .data = &ipv6_devconf.autoconf,
6772 .maxlen = sizeof(int),
6773 .mode = 0644,
6774 .proc_handler = proc_dointvec,
6775 },
6776 {
6777 .procname = "dad_transmits",
6778 .data = &ipv6_devconf.dad_transmits,
6779 .maxlen = sizeof(int),
6780 .mode = 0644,
6781 .proc_handler = proc_dointvec,
6782 },
6783 {
6784 .procname = "router_solicitations",
6785 .data = &ipv6_devconf.rtr_solicits,
6786 .maxlen = sizeof(int),
6787 .mode = 0644,
6788 .proc_handler = proc_dointvec_minmax,
6789 .extra1 = &minus_one,
6790 },
6791 {
6792 .procname = "router_solicitation_interval",
6793 .data = &ipv6_devconf.rtr_solicit_interval,
6794 .maxlen = sizeof(int),
6795 .mode = 0644,
6796 .proc_handler = proc_dointvec_jiffies,
6797 },
6798 {
6799 .procname = "router_solicitation_max_interval",
6800 .data = &ipv6_devconf.rtr_solicit_max_interval,
6801 .maxlen = sizeof(int),
6802 .mode = 0644,
6803 .proc_handler = proc_dointvec_jiffies,
6804 },
6805 {
6806 .procname = "router_solicitation_delay",
6807 .data = &ipv6_devconf.rtr_solicit_delay,
6808 .maxlen = sizeof(int),
6809 .mode = 0644,
6810 .proc_handler = proc_dointvec_jiffies,
6811 },
6812 {
6813 .procname = "force_mld_version",
6814 .data = &ipv6_devconf.force_mld_version,
6815 .maxlen = sizeof(int),
6816 .mode = 0644,
6817 .proc_handler = proc_dointvec,
6818 },
6819 {
6820 .procname = "mldv1_unsolicited_report_interval",
6821 .data =
6822 &ipv6_devconf.mldv1_unsolicited_report_interval,
6823 .maxlen = sizeof(int),
6824 .mode = 0644,
6825 .proc_handler = proc_dointvec_ms_jiffies,
6826 },
6827 {
6828 .procname = "mldv2_unsolicited_report_interval",
6829 .data =
6830 &ipv6_devconf.mldv2_unsolicited_report_interval,
6831 .maxlen = sizeof(int),
6832 .mode = 0644,
6833 .proc_handler = proc_dointvec_ms_jiffies,
6834 },
6835 {
6836 .procname = "use_tempaddr",
6837 .data = &ipv6_devconf.use_tempaddr,
6838 .maxlen = sizeof(int),
6839 .mode = 0644,
6840 .proc_handler = proc_dointvec,
6841 },
6842 {
6843 .procname = "temp_valid_lft",
6844 .data = &ipv6_devconf.temp_valid_lft,
6845 .maxlen = sizeof(int),
6846 .mode = 0644,
6847 .proc_handler = proc_dointvec,
6848 },
6849 {
6850 .procname = "temp_prefered_lft",
6851 .data = &ipv6_devconf.temp_prefered_lft,
6852 .maxlen = sizeof(int),
6853 .mode = 0644,
6854 .proc_handler = proc_dointvec,
6855 },
6856 {
6857 .procname = "regen_min_advance",
6858 .data = &ipv6_devconf.regen_min_advance,
6859 .maxlen = sizeof(int),
6860 .mode = 0644,
6861 .proc_handler = proc_dointvec,
6862 },
6863 {
6864 .procname = "regen_max_retry",
6865 .data = &ipv6_devconf.regen_max_retry,
6866 .maxlen = sizeof(int),
6867 .mode = 0644,
6868 .proc_handler = proc_dointvec,
6869 },
6870 {
6871 .procname = "max_desync_factor",
6872 .data = &ipv6_devconf.max_desync_factor,
6873 .maxlen = sizeof(int),
6874 .mode = 0644,
6875 .proc_handler = proc_dointvec,
6876 },
6877 {
6878 .procname = "max_addresses",
6879 .data = &ipv6_devconf.max_addresses,
6880 .maxlen = sizeof(int),
6881 .mode = 0644,
6882 .proc_handler = proc_dointvec,
6883 },
6884 {
6885 .procname = "accept_ra_defrtr",
6886 .data = &ipv6_devconf.accept_ra_defrtr,
6887 .maxlen = sizeof(int),
6888 .mode = 0644,
6889 .proc_handler = proc_dointvec,
6890 },
6891 {
6892 .procname = "ra_defrtr_metric",
6893 .data = &ipv6_devconf.ra_defrtr_metric,
6894 .maxlen = sizeof(u32),
6895 .mode = 0644,
6896 .proc_handler = proc_douintvec_minmax,
6897 .extra1 = (void *)SYSCTL_ONE,
6898 },
6899 {
6900 .procname = "accept_ra_min_hop_limit",
6901 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6902 .maxlen = sizeof(int),
6903 .mode = 0644,
6904 .proc_handler = proc_dointvec,
6905 },
6906 {
6907 .procname = "accept_ra_min_lft",
6908 .data = &ipv6_devconf.accept_ra_min_lft,
6909 .maxlen = sizeof(int),
6910 .mode = 0644,
6911 .proc_handler = proc_dointvec,
6912 },
6913 {
6914 .procname = "accept_ra_pinfo",
6915 .data = &ipv6_devconf.accept_ra_pinfo,
6916 .maxlen = sizeof(int),
6917 .mode = 0644,
6918 .proc_handler = proc_dointvec,
6919 },
6920 {
6921 .procname = "ra_honor_pio_life",
6922 .data = &ipv6_devconf.ra_honor_pio_life,
6923 .maxlen = sizeof(u8),
6924 .mode = 0644,
6925 .proc_handler = proc_dou8vec_minmax,
6926 .extra1 = SYSCTL_ZERO,
6927 .extra2 = SYSCTL_ONE,
6928 },
6929 #ifdef CONFIG_IPV6_ROUTER_PREF
6930 {
6931 .procname = "accept_ra_rtr_pref",
6932 .data = &ipv6_devconf.accept_ra_rtr_pref,
6933 .maxlen = sizeof(int),
6934 .mode = 0644,
6935 .proc_handler = proc_dointvec,
6936 },
6937 {
6938 .procname = "router_probe_interval",
6939 .data = &ipv6_devconf.rtr_probe_interval,
6940 .maxlen = sizeof(int),
6941 .mode = 0644,
6942 .proc_handler = proc_dointvec_jiffies,
6943 },
6944 #ifdef CONFIG_IPV6_ROUTE_INFO
6945 {
6946 .procname = "accept_ra_rt_info_min_plen",
6947 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6948 .maxlen = sizeof(int),
6949 .mode = 0644,
6950 .proc_handler = proc_dointvec,
6951 },
6952 {
6953 .procname = "accept_ra_rt_info_max_plen",
6954 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6955 .maxlen = sizeof(int),
6956 .mode = 0644,
6957 .proc_handler = proc_dointvec,
6958 },
6959 #endif
6960 #endif
6961 {
6962 .procname = "proxy_ndp",
6963 .data = &ipv6_devconf.proxy_ndp,
6964 .maxlen = sizeof(int),
6965 .mode = 0644,
6966 .proc_handler = addrconf_sysctl_proxy_ndp,
6967 },
6968 {
6969 .procname = "accept_source_route",
6970 .data = &ipv6_devconf.accept_source_route,
6971 .maxlen = sizeof(int),
6972 .mode = 0644,
6973 .proc_handler = proc_dointvec,
6974 },
6975 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6976 {
6977 .procname = "optimistic_dad",
6978 .data = &ipv6_devconf.optimistic_dad,
6979 .maxlen = sizeof(int),
6980 .mode = 0644,
6981 .proc_handler = proc_dointvec,
6982 },
6983 {
6984 .procname = "use_optimistic",
6985 .data = &ipv6_devconf.use_optimistic,
6986 .maxlen = sizeof(int),
6987 .mode = 0644,
6988 .proc_handler = proc_dointvec,
6989 },
6990 #endif
6991 #ifdef CONFIG_IPV6_MROUTE
6992 {
6993 .procname = "mc_forwarding",
6994 .data = &ipv6_devconf.mc_forwarding,
6995 .maxlen = sizeof(int),
6996 .mode = 0444,
6997 .proc_handler = proc_dointvec,
6998 },
6999 #endif
7000 {
7001 .procname = "disable_ipv6",
7002 .data = &ipv6_devconf.disable_ipv6,
7003 .maxlen = sizeof(int),
7004 .mode = 0644,
7005 .proc_handler = addrconf_sysctl_disable,
7006 },
7007 {
7008 .procname = "accept_dad",
7009 .data = &ipv6_devconf.accept_dad,
7010 .maxlen = sizeof(int),
7011 .mode = 0644,
7012 .proc_handler = proc_dointvec,
7013 },
7014 {
7015 .procname = "force_tllao",
7016 .data = &ipv6_devconf.force_tllao,
7017 .maxlen = sizeof(int),
7018 .mode = 0644,
7019 .proc_handler = proc_dointvec
7020 },
7021 {
7022 .procname = "ndisc_notify",
7023 .data = &ipv6_devconf.ndisc_notify,
7024 .maxlen = sizeof(int),
7025 .mode = 0644,
7026 .proc_handler = proc_dointvec
7027 },
7028 {
7029 .procname = "suppress_frag_ndisc",
7030 .data = &ipv6_devconf.suppress_frag_ndisc,
7031 .maxlen = sizeof(int),
7032 .mode = 0644,
7033 .proc_handler = proc_dointvec
7034 },
7035 {
7036 .procname = "accept_ra_from_local",
7037 .data = &ipv6_devconf.accept_ra_from_local,
7038 .maxlen = sizeof(int),
7039 .mode = 0644,
7040 .proc_handler = proc_dointvec,
7041 },
7042 {
7043 .procname = "accept_ra_mtu",
7044 .data = &ipv6_devconf.accept_ra_mtu,
7045 .maxlen = sizeof(int),
7046 .mode = 0644,
7047 .proc_handler = proc_dointvec,
7048 },
7049 {
7050 .procname = "stable_secret",
7051 .data = &ipv6_devconf.stable_secret,
7052 .maxlen = IPV6_MAX_STRLEN,
7053 .mode = 0600,
7054 .proc_handler = addrconf_sysctl_stable_secret,
7055 },
7056 {
7057 .procname = "use_oif_addrs_only",
7058 .data = &ipv6_devconf.use_oif_addrs_only,
7059 .maxlen = sizeof(int),
7060 .mode = 0644,
7061 .proc_handler = proc_dointvec,
7062 },
7063 {
7064 .procname = "ignore_routes_with_linkdown",
7065 .data = &ipv6_devconf.ignore_routes_with_linkdown,
7066 .maxlen = sizeof(int),
7067 .mode = 0644,
7068 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
7069 },
7070 {
7071 .procname = "drop_unicast_in_l2_multicast",
7072 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
7073 .maxlen = sizeof(int),
7074 .mode = 0644,
7075 .proc_handler = proc_dointvec,
7076 },
7077 {
7078 .procname = "drop_unsolicited_na",
7079 .data = &ipv6_devconf.drop_unsolicited_na,
7080 .maxlen = sizeof(int),
7081 .mode = 0644,
7082 .proc_handler = proc_dointvec,
7083 },
7084 {
7085 .procname = "keep_addr_on_down",
7086 .data = &ipv6_devconf.keep_addr_on_down,
7087 .maxlen = sizeof(int),
7088 .mode = 0644,
7089 .proc_handler = proc_dointvec,
7090
7091 },
7092 {
7093 .procname = "seg6_enabled",
7094 .data = &ipv6_devconf.seg6_enabled,
7095 .maxlen = sizeof(int),
7096 .mode = 0644,
7097 .proc_handler = proc_dointvec,
7098 },
7099 #ifdef CONFIG_IPV6_SEG6_HMAC
7100 {
7101 .procname = "seg6_require_hmac",
7102 .data = &ipv6_devconf.seg6_require_hmac,
7103 .maxlen = sizeof(int),
7104 .mode = 0644,
7105 .proc_handler = proc_dointvec,
7106 },
7107 #endif
7108 {
7109 .procname = "enhanced_dad",
7110 .data = &ipv6_devconf.enhanced_dad,
7111 .maxlen = sizeof(int),
7112 .mode = 0644,
7113 .proc_handler = proc_dointvec,
7114 },
7115 {
7116 .procname = "addr_gen_mode",
7117 .data = &ipv6_devconf.addr_gen_mode,
7118 .maxlen = sizeof(int),
7119 .mode = 0644,
7120 .proc_handler = addrconf_sysctl_addr_gen_mode,
7121 },
7122 {
7123 .procname = "disable_policy",
7124 .data = &ipv6_devconf.disable_policy,
7125 .maxlen = sizeof(int),
7126 .mode = 0644,
7127 .proc_handler = addrconf_sysctl_disable_policy,
7128 },
7129 {
7130 .procname = "ndisc_tclass",
7131 .data = &ipv6_devconf.ndisc_tclass,
7132 .maxlen = sizeof(int),
7133 .mode = 0644,
7134 .proc_handler = proc_dointvec_minmax,
7135 .extra1 = (void *)SYSCTL_ZERO,
7136 .extra2 = (void *)&two_five_five,
7137 },
7138 {
7139 .procname = "rpl_seg_enabled",
7140 .data = &ipv6_devconf.rpl_seg_enabled,
7141 .maxlen = sizeof(int),
7142 .mode = 0644,
7143 .proc_handler = proc_dointvec,
7144 },
7145 {
7146 .procname = "ioam6_enabled",
7147 .data = &ipv6_devconf.ioam6_enabled,
7148 .maxlen = sizeof(u8),
7149 .mode = 0644,
7150 .proc_handler = proc_dou8vec_minmax,
7151 .extra1 = (void *)SYSCTL_ZERO,
7152 .extra2 = (void *)SYSCTL_ONE,
7153 },
7154 {
7155 .procname = "ioam6_id",
7156 .data = &ipv6_devconf.ioam6_id,
7157 .maxlen = sizeof(u32),
7158 .mode = 0644,
7159 .proc_handler = proc_douintvec_minmax,
7160 .extra1 = (void *)SYSCTL_ZERO,
7161 .extra2 = (void *)&ioam6_if_id_max,
7162 },
7163 {
7164 .procname = "ioam6_id_wide",
7165 .data = &ipv6_devconf.ioam6_id_wide,
7166 .maxlen = sizeof(u32),
7167 .mode = 0644,
7168 .proc_handler = proc_douintvec,
7169 },
7170 {
7171 .procname = "ndisc_evict_nocarrier",
7172 .data = &ipv6_devconf.ndisc_evict_nocarrier,
7173 .maxlen = sizeof(u8),
7174 .mode = 0644,
7175 .proc_handler = proc_dou8vec_minmax,
7176 .extra1 = (void *)SYSCTL_ZERO,
7177 .extra2 = (void *)SYSCTL_ONE,
7178 },
7179 {
7180 .procname = "accept_untracked_na",
7181 .data = &ipv6_devconf.accept_untracked_na,
7182 .maxlen = sizeof(int),
7183 .mode = 0644,
7184 .proc_handler = proc_dointvec_minmax,
7185 .extra1 = SYSCTL_ZERO,
7186 .extra2 = SYSCTL_TWO,
7187 },
7188 };
7189
7190 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7191 struct inet6_dev *idev, struct ipv6_devconf *p)
7192 {
7193 size_t table_size = ARRAY_SIZE(addrconf_sysctl);
7194 int i, ifindex;
7195 struct ctl_table *table;
7196 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7197
7198 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7199 if (!table)
7200 goto out;
7201
7202 for (i = 0; i < table_size; i++) {
7203 table[i].data += (char *)p - (char *)&ipv6_devconf;
7204 /* If one of these is already set, then it is not safe to
7205 * overwrite either of them: this makes proc_dointvec_minmax
7206 * usable.
7207 */
7208 if (!table[i].extra1 && !table[i].extra2) {
7209 table[i].extra1 = idev; /* embedded; no ref */
7210 table[i].extra2 = net;
7211 }
7212 }
7213
7214 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7215
7216 p->sysctl_header = register_net_sysctl_sz(net, path, table,
7217 table_size);
7218 if (!p->sysctl_header)
7219 goto free;
7220
7221 if (!strcmp(dev_name, "all"))
7222 ifindex = NETCONFA_IFINDEX_ALL;
7223 else if (!strcmp(dev_name, "default"))
7224 ifindex = NETCONFA_IFINDEX_DEFAULT;
7225 else
7226 ifindex = idev->dev->ifindex;
7227 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7228 ifindex, p);
7229 return 0;
7230
7231 free:
7232 kfree(table);
7233 out:
7234 return -ENOBUFS;
7235 }
7236
7237 static void __addrconf_sysctl_unregister(struct net *net,
7238 struct ipv6_devconf *p, int ifindex)
7239 {
7240 const struct ctl_table *table;
7241
7242 if (!p->sysctl_header)
7243 return;
7244
7245 table = p->sysctl_header->ctl_table_arg;
7246 unregister_net_sysctl_table(p->sysctl_header);
7247 p->sysctl_header = NULL;
7248 kfree(table);
7249
7250 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7251 }
7252
7253 static int addrconf_sysctl_register(struct inet6_dev *idev)
7254 {
7255 int err;
7256
7257 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7258 return -EINVAL;
7259
7260 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7261 &ndisc_ifinfo_sysctl_change);
7262 if (err)
7263 return err;
7264 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7265 idev, &idev->cnf);
7266 if (err)
7267 neigh_sysctl_unregister(idev->nd_parms);
7268
7269 return err;
7270 }
7271
7272 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7273 {
7274 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7275 idev->dev->ifindex);
7276 neigh_sysctl_unregister(idev->nd_parms);
7277 }
7278
7279
7280 #endif
7281
7282 static int __net_init addrconf_init_net(struct net *net)
7283 {
7284 int err = -ENOMEM;
7285 struct ipv6_devconf *all, *dflt;
7286
7287 spin_lock_init(&net->ipv6.addrconf_hash_lock);
7288 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7289 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7290 sizeof(struct hlist_head),
7291 GFP_KERNEL);
7292 if (!net->ipv6.inet6_addr_lst)
7293 goto err_alloc_addr;
7294
7295 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7296 if (!all)
7297 goto err_alloc_all;
7298
7299 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7300 if (!dflt)
7301 goto err_alloc_dflt;
7302
7303 if (!net_eq(net, &init_net)) {
7304 switch (net_inherit_devconf()) {
7305 case 1: /* copy from init_net */
7306 memcpy(all, init_net.ipv6.devconf_all,
7307 sizeof(ipv6_devconf));
7308 memcpy(dflt, init_net.ipv6.devconf_dflt,
7309 sizeof(ipv6_devconf_dflt));
7310 break;
7311 case 3: /* copy from the current netns */
7312 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7313 sizeof(ipv6_devconf));
7314 memcpy(dflt,
7315 current->nsproxy->net_ns->ipv6.devconf_dflt,
7316 sizeof(ipv6_devconf_dflt));
7317 break;
7318 case 0:
7319 case 2:
7320 /* use compiled values */
7321 break;
7322 }
7323 }
7324
7325 /* these will be inherited by all namespaces */
7326 dflt->autoconf = ipv6_defaults.autoconf;
7327 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7328
7329 dflt->stable_secret.initialized = false;
7330 all->stable_secret.initialized = false;
7331
7332 net->ipv6.devconf_all = all;
7333 net->ipv6.devconf_dflt = dflt;
7334
7335 #ifdef CONFIG_SYSCTL
7336 err = __addrconf_sysctl_register(net, "all", NULL, all);
7337 if (err < 0)
7338 goto err_reg_all;
7339
7340 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7341 if (err < 0)
7342 goto err_reg_dflt;
7343 #endif
7344 return 0;
7345
7346 #ifdef CONFIG_SYSCTL
7347 err_reg_dflt:
7348 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7349 err_reg_all:
7350 kfree(dflt);
7351 net->ipv6.devconf_dflt = NULL;
7352 #endif
7353 err_alloc_dflt:
7354 kfree(all);
7355 net->ipv6.devconf_all = NULL;
7356 err_alloc_all:
7357 kfree(net->ipv6.inet6_addr_lst);
7358 err_alloc_addr:
7359 return err;
7360 }
7361
7362 static void __net_exit addrconf_exit_net(struct net *net)
7363 {
7364 int i;
7365
7366 #ifdef CONFIG_SYSCTL
7367 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7368 NETCONFA_IFINDEX_DEFAULT);
7369 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7370 NETCONFA_IFINDEX_ALL);
7371 #endif
7372 kfree(net->ipv6.devconf_dflt);
7373 net->ipv6.devconf_dflt = NULL;
7374 kfree(net->ipv6.devconf_all);
7375 net->ipv6.devconf_all = NULL;
7376
7377 cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
7378 /*
7379 * Check hash table, then free it.
7380 */
7381 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7382 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7383
7384 kfree(net->ipv6.inet6_addr_lst);
7385 net->ipv6.inet6_addr_lst = NULL;
7386 }
7387
7388 static struct pernet_operations addrconf_ops = {
7389 .init = addrconf_init_net,
7390 .exit = addrconf_exit_net,
7391 };
7392
7393 static struct rtnl_af_ops inet6_ops __read_mostly = {
7394 .family = AF_INET6,
7395 .fill_link_af = inet6_fill_link_af,
7396 .get_link_af_size = inet6_get_link_af_size,
7397 .validate_link_af = inet6_validate_link_af,
7398 .set_link_af = inet6_set_link_af,
7399 };
7400
7401 /*
7402 * Init / cleanup code
7403 */
7404
7405 int __init addrconf_init(void)
7406 {
7407 struct inet6_dev *idev;
7408 int err;
7409
7410 err = ipv6_addr_label_init();
7411 if (err < 0) {
7412 pr_crit("%s: cannot initialize default policy table: %d\n",
7413 __func__, err);
7414 goto out;
7415 }
7416
7417 err = register_pernet_subsys(&addrconf_ops);
7418 if (err < 0)
7419 goto out_addrlabel;
7420
7421 /* All works using addrconf_wq need to lock rtnl. */
7422 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf");
7423 if (!addrconf_wq) {
7424 err = -ENOMEM;
7425 goto out_nowq;
7426 }
7427
7428 rtnl_lock();
7429 idev = ipv6_add_dev(blackhole_netdev);
7430 rtnl_unlock();
7431 if (IS_ERR(idev)) {
7432 err = PTR_ERR(idev);
7433 goto errlo;
7434 }
7435
7436 ip6_route_init_special_entries();
7437
7438 register_netdevice_notifier(&ipv6_dev_notf);
7439
7440 addrconf_verify(&init_net);
7441
7442 rtnl_af_register(&inet6_ops);
7443
7444 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7445 NULL, inet6_dump_ifinfo, RTNL_FLAG_DUMP_UNLOCKED);
7446 if (err < 0)
7447 goto errout;
7448
7449 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7450 inet6_rtm_newaddr, NULL, 0);
7451 if (err < 0)
7452 goto errout;
7453 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7454 inet6_rtm_deladdr, NULL, 0);
7455 if (err < 0)
7456 goto errout;
7457 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7458 inet6_rtm_getaddr, inet6_dump_ifaddr,
7459 RTNL_FLAG_DOIT_UNLOCKED |
7460 RTNL_FLAG_DUMP_UNLOCKED);
7461 if (err < 0)
7462 goto errout;
7463 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7464 NULL, inet6_dump_ifmcaddr,
7465 RTNL_FLAG_DUMP_UNLOCKED);
7466 if (err < 0)
7467 goto errout;
7468 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7469 NULL, inet6_dump_ifacaddr,
7470 RTNL_FLAG_DUMP_UNLOCKED);
7471 if (err < 0)
7472 goto errout;
7473 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7474 inet6_netconf_get_devconf,
7475 inet6_netconf_dump_devconf,
7476 RTNL_FLAG_DOIT_UNLOCKED |
7477 RTNL_FLAG_DUMP_UNLOCKED);
7478 if (err < 0)
7479 goto errout;
7480 err = ipv6_addr_label_rtnl_register();
7481 if (err < 0)
7482 goto errout;
7483
7484 return 0;
7485 errout:
7486 rtnl_unregister_all(PF_INET6);
7487 rtnl_af_unregister(&inet6_ops);
7488 unregister_netdevice_notifier(&ipv6_dev_notf);
7489 errlo:
7490 destroy_workqueue(addrconf_wq);
7491 out_nowq:
7492 unregister_pernet_subsys(&addrconf_ops);
7493 out_addrlabel:
7494 ipv6_addr_label_cleanup();
7495 out:
7496 return err;
7497 }
7498
7499 void addrconf_cleanup(void)
7500 {
7501 struct net_device *dev;
7502
7503 unregister_netdevice_notifier(&ipv6_dev_notf);
7504 unregister_pernet_subsys(&addrconf_ops);
7505 ipv6_addr_label_cleanup();
7506
7507 rtnl_af_unregister(&inet6_ops);
7508
7509 rtnl_lock();
7510
7511 /* clean dev list */
7512 for_each_netdev(&init_net, dev) {
7513 if (__in6_dev_get(dev) == NULL)
7514 continue;
7515 addrconf_ifdown(dev, true);
7516 }
7517 addrconf_ifdown(init_net.loopback_dev, true);
7518
7519 rtnl_unlock();
7520
7521 destroy_workqueue(addrconf_wq);
7522 }
7523
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