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Merge tag 'hwmon-for-v6.13-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux.git] / net / ipv6 / addrconf.c
blob0e765466d7f79ecc13316204c4ffc29c7ea3a71b
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 <linux/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 IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
98 static inline u32 cstamp_delta(unsigned long cstamp)
99 {
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101 }
102
103 static inline s32 rfc3315_s14_backoff_init(s32 irt)
104 {
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109 }
110
111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112 {
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = get_random_u32_inclusive(1900000, 2100000) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = get_random_u32_inclusive(900000, 1100000) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122 }
123
124 #ifdef CONFIG_SYSCTL
125 static int addrconf_sysctl_register(struct inet6_dev *idev);
126 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127 #else
128 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
129 {
130 return 0;
131 }
132
133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134 {
135 }
136 #endif
137
138 static void ipv6_gen_rnd_iid(struct in6_addr *addr);
139
140 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
141 static int ipv6_count_addresses(const struct inet6_dev *idev);
142 static int ipv6_generate_stable_address(struct in6_addr *addr,
143 u8 dad_count,
144 const struct inet6_dev *idev);
145
146 #define IN6_ADDR_HSIZE_SHIFT 8
147 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
148
149 static void addrconf_verify(struct net *net);
150 static void addrconf_verify_rtnl(struct net *net);
151
152 static struct workqueue_struct *addrconf_wq;
153
154 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
155 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
156
157 static void addrconf_type_change(struct net_device *dev,
158 unsigned long event);
159 static int addrconf_ifdown(struct net_device *dev, bool unregister);
160
161 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
162 int plen,
163 const struct net_device *dev,
164 u32 flags, u32 noflags,
165 bool no_gw);
166
167 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
168 static void addrconf_dad_work(struct work_struct *w);
169 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
170 bool send_na);
171 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
172 static void addrconf_rs_timer(struct timer_list *t);
173 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
174 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
175
176 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
177 struct prefix_info *pinfo);
178
179 static struct ipv6_devconf ipv6_devconf __read_mostly = {
180 .forwarding = 0,
181 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
182 .mtu6 = IPV6_MIN_MTU,
183 .accept_ra = 1,
184 .accept_redirects = 1,
185 .autoconf = 1,
186 .force_mld_version = 0,
187 .mldv1_unsolicited_report_interval = 10 * HZ,
188 .mldv2_unsolicited_report_interval = HZ,
189 .dad_transmits = 1,
190 .rtr_solicits = MAX_RTR_SOLICITATIONS,
191 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
192 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
193 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
194 .use_tempaddr = 0,
195 .temp_valid_lft = TEMP_VALID_LIFETIME,
196 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
197 .regen_min_advance = REGEN_MIN_ADVANCE,
198 .regen_max_retry = REGEN_MAX_RETRY,
199 .max_desync_factor = MAX_DESYNC_FACTOR,
200 .max_addresses = IPV6_MAX_ADDRESSES,
201 .accept_ra_defrtr = 1,
202 .ra_defrtr_metric = IP6_RT_PRIO_USER,
203 .accept_ra_from_local = 0,
204 .accept_ra_min_hop_limit= 1,
205 .accept_ra_min_lft = 0,
206 .accept_ra_pinfo = 1,
207 #ifdef CONFIG_IPV6_ROUTER_PREF
208 .accept_ra_rtr_pref = 1,
209 .rtr_probe_interval = 60 * HZ,
210 #ifdef CONFIG_IPV6_ROUTE_INFO
211 .accept_ra_rt_info_min_plen = 0,
212 .accept_ra_rt_info_max_plen = 0,
213 #endif
214 #endif
215 .proxy_ndp = 0,
216 .accept_source_route = 0, /* we do not accept RH0 by default. */
217 .disable_ipv6 = 0,
218 .accept_dad = 0,
219 .suppress_frag_ndisc = 1,
220 .accept_ra_mtu = 1,
221 .stable_secret = {
222 .initialized = false,
223 },
224 .use_oif_addrs_only = 0,
225 .ignore_routes_with_linkdown = 0,
226 .keep_addr_on_down = 0,
227 .seg6_enabled = 0,
228 #ifdef CONFIG_IPV6_SEG6_HMAC
229 .seg6_require_hmac = 0,
230 #endif
231 .enhanced_dad = 1,
232 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
233 .disable_policy = 0,
234 .rpl_seg_enabled = 0,
235 .ioam6_enabled = 0,
236 .ioam6_id = IOAM6_DEFAULT_IF_ID,
237 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
238 .ndisc_evict_nocarrier = 1,
239 .ra_honor_pio_life = 0,
240 .ra_honor_pio_pflag = 0,
241 };
242
243 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
244 .forwarding = 0,
245 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
246 .mtu6 = IPV6_MIN_MTU,
247 .accept_ra = 1,
248 .accept_redirects = 1,
249 .autoconf = 1,
250 .force_mld_version = 0,
251 .mldv1_unsolicited_report_interval = 10 * HZ,
252 .mldv2_unsolicited_report_interval = HZ,
253 .dad_transmits = 1,
254 .rtr_solicits = MAX_RTR_SOLICITATIONS,
255 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
256 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
257 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
258 .use_tempaddr = 0,
259 .temp_valid_lft = TEMP_VALID_LIFETIME,
260 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
261 .regen_min_advance = REGEN_MIN_ADVANCE,
262 .regen_max_retry = REGEN_MAX_RETRY,
263 .max_desync_factor = MAX_DESYNC_FACTOR,
264 .max_addresses = IPV6_MAX_ADDRESSES,
265 .accept_ra_defrtr = 1,
266 .ra_defrtr_metric = IP6_RT_PRIO_USER,
267 .accept_ra_from_local = 0,
268 .accept_ra_min_hop_limit= 1,
269 .accept_ra_min_lft = 0,
270 .accept_ra_pinfo = 1,
271 #ifdef CONFIG_IPV6_ROUTER_PREF
272 .accept_ra_rtr_pref = 1,
273 .rtr_probe_interval = 60 * HZ,
274 #ifdef CONFIG_IPV6_ROUTE_INFO
275 .accept_ra_rt_info_min_plen = 0,
276 .accept_ra_rt_info_max_plen = 0,
277 #endif
278 #endif
279 .proxy_ndp = 0,
280 .accept_source_route = 0, /* we do not accept RH0 by default. */
281 .disable_ipv6 = 0,
282 .accept_dad = 1,
283 .suppress_frag_ndisc = 1,
284 .accept_ra_mtu = 1,
285 .stable_secret = {
286 .initialized = false,
287 },
288 .use_oif_addrs_only = 0,
289 .ignore_routes_with_linkdown = 0,
290 .keep_addr_on_down = 0,
291 .seg6_enabled = 0,
292 #ifdef CONFIG_IPV6_SEG6_HMAC
293 .seg6_require_hmac = 0,
294 #endif
295 .enhanced_dad = 1,
296 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
297 .disable_policy = 0,
298 .rpl_seg_enabled = 0,
299 .ioam6_enabled = 0,
300 .ioam6_id = IOAM6_DEFAULT_IF_ID,
301 .ioam6_id_wide = IOAM6_DEFAULT_IF_ID_WIDE,
302 .ndisc_evict_nocarrier = 1,
303 .ra_honor_pio_life = 0,
304 .ra_honor_pio_pflag = 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_jhash(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 delete_tempaddrs(struct inet6_dev *idev,
2574 struct inet6_ifaddr *ifp)
2575 {
2576 struct inet6_ifaddr *ift, *tmp;
2577
2578 write_lock_bh(&idev->lock);
2579 list_for_each_entry_safe(ift, tmp, &idev->tempaddr_list, tmp_list) {
2580 if (ift->ifpub != ifp)
2581 continue;
2582
2583 in6_ifa_hold(ift);
2584 write_unlock_bh(&idev->lock);
2585 ipv6_del_addr(ift);
2586 write_lock_bh(&idev->lock);
2587 }
2588 write_unlock_bh(&idev->lock);
2589 }
2590
2591 static void manage_tempaddrs(struct inet6_dev *idev,
2592 struct inet6_ifaddr *ifp,
2593 __u32 valid_lft, __u32 prefered_lft,
2594 bool create, unsigned long now)
2595 {
2596 u32 flags;
2597 struct inet6_ifaddr *ift;
2598
2599 read_lock_bh(&idev->lock);
2600 /* update all temporary addresses in the list */
2601 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2602 int age, max_valid, max_prefered;
2603
2604 if (ifp != ift->ifpub)
2605 continue;
2606
2607 /* RFC 4941 section 3.3:
2608 * If a received option will extend the lifetime of a public
2609 * address, the lifetimes of temporary addresses should
2610 * be extended, subject to the overall constraint that no
2611 * temporary addresses should ever remain "valid" or "preferred"
2612 * for a time longer than (TEMP_VALID_LIFETIME) or
2613 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2614 */
2615 age = (now - ift->cstamp) / HZ;
2616 max_valid = READ_ONCE(idev->cnf.temp_valid_lft) - age;
2617 if (max_valid < 0)
2618 max_valid = 0;
2619
2620 max_prefered = READ_ONCE(idev->cnf.temp_prefered_lft) -
2621 idev->desync_factor - age;
2622 if (max_prefered < 0)
2623 max_prefered = 0;
2624
2625 if (valid_lft > max_valid)
2626 valid_lft = max_valid;
2627
2628 if (prefered_lft > max_prefered)
2629 prefered_lft = max_prefered;
2630
2631 spin_lock(&ift->lock);
2632 flags = ift->flags;
2633 ift->valid_lft = valid_lft;
2634 ift->prefered_lft = prefered_lft;
2635 ift->tstamp = now;
2636 if (prefered_lft > 0)
2637 ift->flags &= ~IFA_F_DEPRECATED;
2638
2639 spin_unlock(&ift->lock);
2640 if (!(flags&IFA_F_TENTATIVE))
2641 ipv6_ifa_notify(0, ift);
2642 }
2643
2644 /* Also create a temporary address if it's enabled but no temporary
2645 * address currently exists.
2646 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2647 * as part of cleanup (ie. deleting the mngtmpaddr).
2648 * We don't want that to result in creating a new temporary ip address.
2649 */
2650 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2651 create = true;
2652
2653 if (create && READ_ONCE(idev->cnf.use_tempaddr) > 0) {
2654 /* When a new public address is created as described
2655 * in [ADDRCONF], also create a new temporary address.
2656 */
2657 read_unlock_bh(&idev->lock);
2658 ipv6_create_tempaddr(ifp, false);
2659 } else {
2660 read_unlock_bh(&idev->lock);
2661 }
2662 }
2663
2664 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2665 {
2666 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2667 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2668 }
2669
2670 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2671 const struct prefix_info *pinfo,
2672 struct inet6_dev *in6_dev,
2673 const struct in6_addr *addr, int addr_type,
2674 u32 addr_flags, bool sllao, bool tokenized,
2675 __u32 valid_lft, u32 prefered_lft)
2676 {
2677 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2678 int create = 0, update_lft = 0;
2679
2680 if (!ifp && valid_lft) {
2681 int max_addresses = READ_ONCE(in6_dev->cnf.max_addresses);
2682 struct ifa6_config cfg = {
2683 .pfx = addr,
2684 .plen = pinfo->prefix_len,
2685 .ifa_flags = addr_flags,
2686 .valid_lft = valid_lft,
2687 .preferred_lft = prefered_lft,
2688 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2689 .ifa_proto = IFAPROT_KERNEL_RA
2690 };
2691
2692 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2693 if ((READ_ONCE(net->ipv6.devconf_all->optimistic_dad) ||
2694 READ_ONCE(in6_dev->cnf.optimistic_dad)) &&
2695 !net->ipv6.devconf_all->forwarding && sllao)
2696 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2697 #endif
2698
2699 /* Do not allow to create too much of autoconfigured
2700 * addresses; this would be too easy way to crash kernel.
2701 */
2702 if (!max_addresses ||
2703 ipv6_count_addresses(in6_dev) < max_addresses)
2704 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2705
2706 if (IS_ERR_OR_NULL(ifp))
2707 return -1;
2708
2709 create = 1;
2710 spin_lock_bh(&ifp->lock);
2711 ifp->flags |= IFA_F_MANAGETEMPADDR;
2712 ifp->cstamp = jiffies;
2713 ifp->tokenized = tokenized;
2714 spin_unlock_bh(&ifp->lock);
2715 addrconf_dad_start(ifp);
2716 }
2717
2718 if (ifp) {
2719 u32 flags;
2720 unsigned long now;
2721 u32 stored_lft;
2722
2723 /* update lifetime (RFC2462 5.5.3 e) */
2724 spin_lock_bh(&ifp->lock);
2725 now = jiffies;
2726 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2727 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2728 else
2729 stored_lft = 0;
2730
2731 /* RFC4862 Section 5.5.3e:
2732 * "Note that the preferred lifetime of the
2733 * corresponding address is always reset to
2734 * the Preferred Lifetime in the received
2735 * Prefix Information option, regardless of
2736 * whether the valid lifetime is also reset or
2737 * ignored."
2738 *
2739 * So we should always update prefered_lft here.
2740 */
2741 update_lft = !create && stored_lft;
2742
2743 if (update_lft && !READ_ONCE(in6_dev->cnf.ra_honor_pio_life)) {
2744 const u32 minimum_lft = min_t(u32,
2745 stored_lft, MIN_VALID_LIFETIME);
2746 valid_lft = max(valid_lft, minimum_lft);
2747 }
2748
2749 if (update_lft) {
2750 ifp->valid_lft = valid_lft;
2751 ifp->prefered_lft = prefered_lft;
2752 WRITE_ONCE(ifp->tstamp, now);
2753 flags = ifp->flags;
2754 ifp->flags &= ~IFA_F_DEPRECATED;
2755 spin_unlock_bh(&ifp->lock);
2756
2757 if (!(flags&IFA_F_TENTATIVE))
2758 ipv6_ifa_notify(0, ifp);
2759 } else
2760 spin_unlock_bh(&ifp->lock);
2761
2762 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2763 create, now);
2764
2765 in6_ifa_put(ifp);
2766 addrconf_verify(net);
2767 }
2768
2769 return 0;
2770 }
2771 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2772
2773 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2774 {
2775 struct prefix_info *pinfo;
2776 struct fib6_table *table;
2777 __u32 valid_lft;
2778 __u32 prefered_lft;
2779 int addr_type, err;
2780 u32 addr_flags = 0;
2781 struct inet6_dev *in6_dev;
2782 struct net *net = dev_net(dev);
2783 bool ignore_autoconf = false;
2784
2785 pinfo = (struct prefix_info *) opt;
2786
2787 if (len < sizeof(struct prefix_info)) {
2788 netdev_dbg(dev, "addrconf: prefix option too short\n");
2789 return;
2790 }
2791
2792 /*
2793 * Validation checks ([ADDRCONF], page 19)
2794 */
2795
2796 addr_type = ipv6_addr_type(&pinfo->prefix);
2797
2798 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2799 return;
2800
2801 valid_lft = ntohl(pinfo->valid);
2802 prefered_lft = ntohl(pinfo->prefered);
2803
2804 if (prefered_lft > valid_lft) {
2805 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2806 return;
2807 }
2808
2809 in6_dev = in6_dev_get(dev);
2810
2811 if (!in6_dev) {
2812 net_dbg_ratelimited("addrconf: device %s not configured\n",
2813 dev->name);
2814 return;
2815 }
2816
2817 if (valid_lft != 0 && valid_lft < in6_dev->cnf.accept_ra_min_lft)
2818 goto put;
2819
2820 /*
2821 * Two things going on here:
2822 * 1) Add routes for on-link prefixes
2823 * 2) Configure prefixes with the auto flag set
2824 */
2825
2826 if (pinfo->onlink) {
2827 struct fib6_info *rt;
2828 unsigned long rt_expires;
2829
2830 /* Avoid arithmetic overflow. Really, we could
2831 * save rt_expires in seconds, likely valid_lft,
2832 * but it would require division in fib gc, that it
2833 * not good.
2834 */
2835 if (HZ > USER_HZ)
2836 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2837 else
2838 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2839
2840 if (addrconf_finite_timeout(rt_expires))
2841 rt_expires *= HZ;
2842
2843 rt = addrconf_get_prefix_route(&pinfo->prefix,
2844 pinfo->prefix_len,
2845 dev,
2846 RTF_ADDRCONF | RTF_PREFIX_RT,
2847 RTF_DEFAULT, true);
2848
2849 if (rt) {
2850 /* Autoconf prefix route */
2851 if (valid_lft == 0) {
2852 ip6_del_rt(net, rt, false);
2853 rt = NULL;
2854 } else {
2855 table = rt->fib6_table;
2856 spin_lock_bh(&table->tb6_lock);
2857
2858 if (addrconf_finite_timeout(rt_expires)) {
2859 /* not infinity */
2860 fib6_set_expires(rt, jiffies + rt_expires);
2861 fib6_add_gc_list(rt);
2862 } else {
2863 fib6_clean_expires(rt);
2864 fib6_remove_gc_list(rt);
2865 }
2866
2867 spin_unlock_bh(&table->tb6_lock);
2868 }
2869 } else if (valid_lft) {
2870 clock_t expires = 0;
2871 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2872 if (addrconf_finite_timeout(rt_expires)) {
2873 /* not infinity */
2874 flags |= RTF_EXPIRES;
2875 expires = jiffies_to_clock_t(rt_expires);
2876 }
2877 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2878 0, dev, expires, flags,
2879 GFP_ATOMIC);
2880 }
2881 fib6_info_release(rt);
2882 }
2883
2884 /* Try to figure out our local address for this prefix */
2885
2886 ignore_autoconf = READ_ONCE(in6_dev->cnf.ra_honor_pio_pflag) && pinfo->preferpd;
2887 if (pinfo->autoconf && in6_dev->cnf.autoconf && !ignore_autoconf) {
2888 struct in6_addr addr;
2889 bool tokenized = false, dev_addr_generated = false;
2890
2891 if (pinfo->prefix_len == 64) {
2892 memcpy(&addr, &pinfo->prefix, 8);
2893
2894 if (!ipv6_addr_any(&in6_dev->token)) {
2895 read_lock_bh(&in6_dev->lock);
2896 memcpy(addr.s6_addr + 8,
2897 in6_dev->token.s6_addr + 8, 8);
2898 read_unlock_bh(&in6_dev->lock);
2899 tokenized = true;
2900 } else if (is_addr_mode_generate_stable(in6_dev) &&
2901 !ipv6_generate_stable_address(&addr, 0,
2902 in6_dev)) {
2903 addr_flags |= IFA_F_STABLE_PRIVACY;
2904 goto ok;
2905 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2906 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2907 goto put;
2908 } else {
2909 dev_addr_generated = true;
2910 }
2911 goto ok;
2912 }
2913 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2914 pinfo->prefix_len);
2915 goto put;
2916
2917 ok:
2918 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2919 &addr, addr_type,
2920 addr_flags, sllao,
2921 tokenized, valid_lft,
2922 prefered_lft);
2923 if (err)
2924 goto put;
2925
2926 /* Ignore error case here because previous prefix add addr was
2927 * successful which will be notified.
2928 */
2929 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2930 addr_type, addr_flags, sllao,
2931 tokenized, valid_lft,
2932 prefered_lft,
2933 dev_addr_generated);
2934 }
2935 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2936 put:
2937 in6_dev_put(in6_dev);
2938 }
2939
2940 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2941 struct in6_ifreq *ireq)
2942 {
2943 struct ip_tunnel_parm_kern p = { };
2944 int err;
2945
2946 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2947 return -EADDRNOTAVAIL;
2948
2949 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2950 p.iph.version = 4;
2951 p.iph.ihl = 5;
2952 p.iph.protocol = IPPROTO_IPV6;
2953 p.iph.ttl = 64;
2954
2955 if (!dev->netdev_ops->ndo_tunnel_ctl)
2956 return -EOPNOTSUPP;
2957 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2958 if (err)
2959 return err;
2960
2961 dev = __dev_get_by_name(net, p.name);
2962 if (!dev)
2963 return -ENOBUFS;
2964 return dev_open(dev, NULL);
2965 }
2966
2967 /*
2968 * Set destination address.
2969 * Special case for SIT interfaces where we create a new "virtual"
2970 * device.
2971 */
2972 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2973 {
2974 struct net_device *dev;
2975 struct in6_ifreq ireq;
2976 int err = -ENODEV;
2977
2978 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2979 return -ENODEV;
2980 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2981 return -EFAULT;
2982
2983 rtnl_lock();
2984 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2985 if (dev && dev->type == ARPHRD_SIT)
2986 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2987 rtnl_unlock();
2988 return err;
2989 }
2990
2991 static int ipv6_mc_config(struct sock *sk, bool join,
2992 const struct in6_addr *addr, int ifindex)
2993 {
2994 int ret;
2995
2996 ASSERT_RTNL();
2997
2998 lock_sock(sk);
2999 if (join)
3000 ret = ipv6_sock_mc_join(sk, ifindex, addr);
3001 else
3002 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
3003 release_sock(sk);
3004
3005 return ret;
3006 }
3007
3008 /*
3009 * Manual configuration of address on an interface
3010 */
3011 static int inet6_addr_add(struct net *net, int ifindex,
3012 struct ifa6_config *cfg,
3013 struct netlink_ext_ack *extack)
3014 {
3015 struct inet6_ifaddr *ifp;
3016 struct inet6_dev *idev;
3017 struct net_device *dev;
3018 unsigned long timeout;
3019 clock_t expires;
3020 u32 flags;
3021
3022 ASSERT_RTNL();
3023
3024 if (cfg->plen > 128) {
3025 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3026 return -EINVAL;
3027 }
3028
3029 /* check the lifetime */
3030 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft) {
3031 NL_SET_ERR_MSG_MOD(extack, "address lifetime invalid");
3032 return -EINVAL;
3033 }
3034
3035 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64) {
3036 NL_SET_ERR_MSG_MOD(extack, "address with \"mngtmpaddr\" flag must have a prefix length of 64");
3037 return -EINVAL;
3038 }
3039
3040 dev = __dev_get_by_index(net, ifindex);
3041 if (!dev)
3042 return -ENODEV;
3043
3044 idev = addrconf_add_dev(dev);
3045 if (IS_ERR(idev)) {
3046 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3047 return PTR_ERR(idev);
3048 }
3049
3050 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3051 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3052 true, cfg->pfx, ifindex);
3053
3054 if (ret < 0) {
3055 NL_SET_ERR_MSG_MOD(extack, "Multicast auto join failed");
3056 return ret;
3057 }
3058 }
3059
3060 cfg->scope = ipv6_addr_scope(cfg->pfx);
3061
3062 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
3063 if (addrconf_finite_timeout(timeout)) {
3064 expires = jiffies_to_clock_t(timeout * HZ);
3065 cfg->valid_lft = timeout;
3066 flags = RTF_EXPIRES;
3067 } else {
3068 expires = 0;
3069 flags = 0;
3070 cfg->ifa_flags |= IFA_F_PERMANENT;
3071 }
3072
3073 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
3074 if (addrconf_finite_timeout(timeout)) {
3075 if (timeout == 0)
3076 cfg->ifa_flags |= IFA_F_DEPRECATED;
3077 cfg->preferred_lft = timeout;
3078 }
3079
3080 ifp = ipv6_add_addr(idev, cfg, true, extack);
3081 if (!IS_ERR(ifp)) {
3082 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
3083 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3084 ifp->rt_priority, dev, expires,
3085 flags, GFP_KERNEL);
3086 }
3087
3088 /* Send a netlink notification if DAD is enabled and
3089 * optimistic flag is not set
3090 */
3091 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
3092 ipv6_ifa_notify(0, ifp);
3093 /*
3094 * Note that section 3.1 of RFC 4429 indicates
3095 * that the Optimistic flag should not be set for
3096 * manually configured addresses
3097 */
3098 addrconf_dad_start(ifp);
3099 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
3100 manage_tempaddrs(idev, ifp, cfg->valid_lft,
3101 cfg->preferred_lft, true, jiffies);
3102 in6_ifa_put(ifp);
3103 addrconf_verify_rtnl(net);
3104 return 0;
3105 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3106 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3107 cfg->pfx, ifindex);
3108 }
3109
3110 return PTR_ERR(ifp);
3111 }
3112
3113 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3114 const struct in6_addr *pfx, unsigned int plen,
3115 struct netlink_ext_ack *extack)
3116 {
3117 struct inet6_ifaddr *ifp;
3118 struct inet6_dev *idev;
3119 struct net_device *dev;
3120
3121 if (plen > 128) {
3122 NL_SET_ERR_MSG_MOD(extack, "Invalid prefix length");
3123 return -EINVAL;
3124 }
3125
3126 dev = __dev_get_by_index(net, ifindex);
3127 if (!dev) {
3128 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
3129 return -ENODEV;
3130 }
3131
3132 idev = __in6_dev_get(dev);
3133 if (!idev) {
3134 NL_SET_ERR_MSG_MOD(extack, "IPv6 is disabled on this device");
3135 return -ENXIO;
3136 }
3137
3138 read_lock_bh(&idev->lock);
3139 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3140 if (ifp->prefix_len == plen &&
3141 ipv6_addr_equal(pfx, &ifp->addr)) {
3142 in6_ifa_hold(ifp);
3143 read_unlock_bh(&idev->lock);
3144
3145 ipv6_del_addr(ifp);
3146
3147 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3148 (ifp->flags & IFA_F_MANAGETEMPADDR))
3149 delete_tempaddrs(idev, ifp);
3150
3151 addrconf_verify_rtnl(net);
3152 if (ipv6_addr_is_multicast(pfx)) {
3153 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3154 false, pfx, dev->ifindex);
3155 }
3156 return 0;
3157 }
3158 }
3159 read_unlock_bh(&idev->lock);
3160
3161 NL_SET_ERR_MSG_MOD(extack, "address not found");
3162 return -EADDRNOTAVAIL;
3163 }
3164
3165
3166 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3167 {
3168 struct ifa6_config cfg = {
3169 .ifa_flags = IFA_F_PERMANENT,
3170 .preferred_lft = INFINITY_LIFE_TIME,
3171 .valid_lft = INFINITY_LIFE_TIME,
3172 };
3173 struct in6_ifreq ireq;
3174 int err;
3175
3176 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3177 return -EPERM;
3178
3179 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3180 return -EFAULT;
3181
3182 cfg.pfx = &ireq.ifr6_addr;
3183 cfg.plen = ireq.ifr6_prefixlen;
3184
3185 rtnl_lock();
3186 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3187 rtnl_unlock();
3188 return err;
3189 }
3190
3191 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3192 {
3193 struct in6_ifreq ireq;
3194 int err;
3195
3196 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3197 return -EPERM;
3198
3199 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3200 return -EFAULT;
3201
3202 rtnl_lock();
3203 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3204 ireq.ifr6_prefixlen, NULL);
3205 rtnl_unlock();
3206 return err;
3207 }
3208
3209 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3210 int plen, int scope, u8 proto)
3211 {
3212 struct inet6_ifaddr *ifp;
3213 struct ifa6_config cfg = {
3214 .pfx = addr,
3215 .plen = plen,
3216 .ifa_flags = IFA_F_PERMANENT,
3217 .valid_lft = INFINITY_LIFE_TIME,
3218 .preferred_lft = INFINITY_LIFE_TIME,
3219 .scope = scope,
3220 .ifa_proto = proto
3221 };
3222
3223 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3224 if (!IS_ERR(ifp)) {
3225 spin_lock_bh(&ifp->lock);
3226 ifp->flags &= ~IFA_F_TENTATIVE;
3227 spin_unlock_bh(&ifp->lock);
3228 rt_genid_bump_ipv6(dev_net(idev->dev));
3229 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3230 in6_ifa_put(ifp);
3231 }
3232 }
3233
3234 #if IS_ENABLED(CONFIG_IPV6_SIT) || IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3235 static void add_v4_addrs(struct inet6_dev *idev)
3236 {
3237 struct in6_addr addr;
3238 struct net_device *dev;
3239 struct net *net = dev_net(idev->dev);
3240 int scope, plen, offset = 0;
3241 u32 pflags = 0;
3242
3243 ASSERT_RTNL();
3244
3245 memset(&addr, 0, sizeof(struct in6_addr));
3246 /* in case of IP6GRE the dev_addr is an IPv6 and therefore we use only the last 4 bytes */
3247 if (idev->dev->addr_len == sizeof(struct in6_addr))
3248 offset = sizeof(struct in6_addr) - 4;
3249 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr + offset, 4);
3250
3251 if (!(idev->dev->flags & IFF_POINTOPOINT) && idev->dev->type == ARPHRD_SIT) {
3252 scope = IPV6_ADDR_COMPATv4;
3253 plen = 96;
3254 pflags |= RTF_NONEXTHOP;
3255 } else {
3256 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3257 return;
3258
3259 addr.s6_addr32[0] = htonl(0xfe800000);
3260 scope = IFA_LINK;
3261 plen = 64;
3262 }
3263
3264 if (addr.s6_addr32[3]) {
3265 add_addr(idev, &addr, plen, scope, IFAPROT_UNSPEC);
3266 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3267 GFP_KERNEL);
3268 return;
3269 }
3270
3271 for_each_netdev(net, dev) {
3272 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3273 if (in_dev && (dev->flags & IFF_UP)) {
3274 struct in_ifaddr *ifa;
3275 int flag = scope;
3276
3277 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3278 addr.s6_addr32[3] = ifa->ifa_local;
3279
3280 if (ifa->ifa_scope == RT_SCOPE_LINK)
3281 continue;
3282 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3283 if (idev->dev->flags&IFF_POINTOPOINT)
3284 continue;
3285 flag |= IFA_HOST;
3286 }
3287
3288 add_addr(idev, &addr, plen, flag,
3289 IFAPROT_UNSPEC);
3290 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3291 0, pflags, GFP_KERNEL);
3292 }
3293 }
3294 }
3295 }
3296 #endif
3297
3298 static void init_loopback(struct net_device *dev)
3299 {
3300 struct inet6_dev *idev;
3301
3302 /* ::1 */
3303
3304 ASSERT_RTNL();
3305
3306 idev = ipv6_find_idev(dev);
3307 if (IS_ERR(idev)) {
3308 pr_debug("%s: add_dev failed\n", __func__);
3309 return;
3310 }
3311
3312 add_addr(idev, &in6addr_loopback, 128, IFA_HOST, IFAPROT_KERNEL_LO);
3313 }
3314
3315 void addrconf_add_linklocal(struct inet6_dev *idev,
3316 const struct in6_addr *addr, u32 flags)
3317 {
3318 struct ifa6_config cfg = {
3319 .pfx = addr,
3320 .plen = 64,
3321 .ifa_flags = flags | IFA_F_PERMANENT,
3322 .valid_lft = INFINITY_LIFE_TIME,
3323 .preferred_lft = INFINITY_LIFE_TIME,
3324 .scope = IFA_LINK,
3325 .ifa_proto = IFAPROT_KERNEL_LL
3326 };
3327 struct inet6_ifaddr *ifp;
3328
3329 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3330 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad) ||
3331 READ_ONCE(idev->cnf.optimistic_dad)) &&
3332 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3333 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3334 #endif
3335
3336 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3337 if (!IS_ERR(ifp)) {
3338 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3339 0, 0, GFP_ATOMIC);
3340 addrconf_dad_start(ifp);
3341 in6_ifa_put(ifp);
3342 }
3343 }
3344 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3345
3346 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3347 {
3348 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3349 return true;
3350
3351 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3352 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3353 return true;
3354
3355 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3356 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3357 return true;
3358
3359 return false;
3360 }
3361
3362 static int ipv6_generate_stable_address(struct in6_addr *address,
3363 u8 dad_count,
3364 const struct inet6_dev *idev)
3365 {
3366 static DEFINE_SPINLOCK(lock);
3367 static __u32 digest[SHA1_DIGEST_WORDS];
3368 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3369
3370 static union {
3371 char __data[SHA1_BLOCK_SIZE];
3372 struct {
3373 struct in6_addr secret;
3374 __be32 prefix[2];
3375 unsigned char hwaddr[MAX_ADDR_LEN];
3376 u8 dad_count;
3377 } __packed;
3378 } data;
3379
3380 struct in6_addr secret;
3381 struct in6_addr temp;
3382 struct net *net = dev_net(idev->dev);
3383
3384 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3385
3386 if (idev->cnf.stable_secret.initialized)
3387 secret = idev->cnf.stable_secret.secret;
3388 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3389 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3390 else
3391 return -1;
3392
3393 retry:
3394 spin_lock_bh(&lock);
3395
3396 sha1_init(digest);
3397 memset(&data, 0, sizeof(data));
3398 memset(workspace, 0, sizeof(workspace));
3399 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3400 data.prefix[0] = address->s6_addr32[0];
3401 data.prefix[1] = address->s6_addr32[1];
3402 data.secret = secret;
3403 data.dad_count = dad_count;
3404
3405 sha1_transform(digest, data.__data, workspace);
3406
3407 temp = *address;
3408 temp.s6_addr32[2] = (__force __be32)digest[0];
3409 temp.s6_addr32[3] = (__force __be32)digest[1];
3410
3411 spin_unlock_bh(&lock);
3412
3413 if (ipv6_reserved_interfaceid(temp)) {
3414 dad_count++;
3415 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3416 return -1;
3417 goto retry;
3418 }
3419
3420 *address = temp;
3421 return 0;
3422 }
3423
3424 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3425 {
3426 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3427
3428 if (s->initialized)
3429 return;
3430 s = &idev->cnf.stable_secret;
3431 get_random_bytes(&s->secret, sizeof(s->secret));
3432 s->initialized = true;
3433 }
3434
3435 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3436 {
3437 struct in6_addr addr;
3438
3439 /* no link local addresses on L3 master devices */
3440 if (netif_is_l3_master(idev->dev))
3441 return;
3442
3443 /* no link local addresses on devices flagged as slaves */
3444 if (idev->dev->priv_flags & IFF_NO_ADDRCONF)
3445 return;
3446
3447 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3448
3449 switch (idev->cnf.addr_gen_mode) {
3450 case IN6_ADDR_GEN_MODE_RANDOM:
3451 ipv6_gen_mode_random_init(idev);
3452 fallthrough;
3453 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3454 if (!ipv6_generate_stable_address(&addr, 0, idev))
3455 addrconf_add_linklocal(idev, &addr,
3456 IFA_F_STABLE_PRIVACY);
3457 else if (prefix_route)
3458 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3459 0, 0, GFP_KERNEL);
3460 break;
3461 case IN6_ADDR_GEN_MODE_EUI64:
3462 /* addrconf_add_linklocal also adds a prefix_route and we
3463 * only need to care about prefix routes if ipv6_generate_eui64
3464 * couldn't generate one.
3465 */
3466 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3467 addrconf_add_linklocal(idev, &addr, 0);
3468 else if (prefix_route)
3469 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3470 0, 0, GFP_KERNEL);
3471 break;
3472 case IN6_ADDR_GEN_MODE_NONE:
3473 default:
3474 /* will not add any link local address */
3475 break;
3476 }
3477 }
3478
3479 static void addrconf_dev_config(struct net_device *dev)
3480 {
3481 struct inet6_dev *idev;
3482
3483 ASSERT_RTNL();
3484
3485 if ((dev->type != ARPHRD_ETHER) &&
3486 (dev->type != ARPHRD_FDDI) &&
3487 (dev->type != ARPHRD_ARCNET) &&
3488 (dev->type != ARPHRD_INFINIBAND) &&
3489 (dev->type != ARPHRD_IEEE1394) &&
3490 (dev->type != ARPHRD_TUNNEL6) &&
3491 (dev->type != ARPHRD_6LOWPAN) &&
3492 (dev->type != ARPHRD_TUNNEL) &&
3493 (dev->type != ARPHRD_NONE) &&
3494 (dev->type != ARPHRD_RAWIP)) {
3495 /* Alas, we support only Ethernet autoconfiguration. */
3496 idev = __in6_dev_get(dev);
3497 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3498 dev->flags & IFF_MULTICAST)
3499 ipv6_mc_up(idev);
3500 return;
3501 }
3502
3503 idev = addrconf_add_dev(dev);
3504 if (IS_ERR(idev))
3505 return;
3506
3507 /* this device type has no EUI support */
3508 if (dev->type == ARPHRD_NONE &&
3509 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3510 WRITE_ONCE(idev->cnf.addr_gen_mode,
3511 IN6_ADDR_GEN_MODE_RANDOM);
3512
3513 addrconf_addr_gen(idev, false);
3514 }
3515
3516 #if IS_ENABLED(CONFIG_IPV6_SIT)
3517 static void addrconf_sit_config(struct net_device *dev)
3518 {
3519 struct inet6_dev *idev;
3520
3521 ASSERT_RTNL();
3522
3523 /*
3524 * Configure the tunnel with one of our IPv4
3525 * addresses... we should configure all of
3526 * our v4 addrs in the tunnel
3527 */
3528
3529 idev = ipv6_find_idev(dev);
3530 if (IS_ERR(idev)) {
3531 pr_debug("%s: add_dev failed\n", __func__);
3532 return;
3533 }
3534
3535 if (dev->priv_flags & IFF_ISATAP) {
3536 addrconf_addr_gen(idev, false);
3537 return;
3538 }
3539
3540 add_v4_addrs(idev);
3541
3542 if (dev->flags&IFF_POINTOPOINT)
3543 addrconf_add_mroute(dev);
3544 }
3545 #endif
3546
3547 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3548 static void addrconf_gre_config(struct net_device *dev)
3549 {
3550 struct inet6_dev *idev;
3551
3552 ASSERT_RTNL();
3553
3554 idev = ipv6_find_idev(dev);
3555 if (IS_ERR(idev)) {
3556 pr_debug("%s: add_dev failed\n", __func__);
3557 return;
3558 }
3559
3560 if (dev->type == ARPHRD_ETHER) {
3561 addrconf_addr_gen(idev, true);
3562 return;
3563 }
3564
3565 add_v4_addrs(idev);
3566
3567 if (dev->flags & IFF_POINTOPOINT)
3568 addrconf_add_mroute(dev);
3569 }
3570 #endif
3571
3572 static void addrconf_init_auto_addrs(struct net_device *dev)
3573 {
3574 switch (dev->type) {
3575 #if IS_ENABLED(CONFIG_IPV6_SIT)
3576 case ARPHRD_SIT:
3577 addrconf_sit_config(dev);
3578 break;
3579 #endif
3580 #if IS_ENABLED(CONFIG_NET_IPGRE) || IS_ENABLED(CONFIG_IPV6_GRE)
3581 case ARPHRD_IP6GRE:
3582 case ARPHRD_IPGRE:
3583 addrconf_gre_config(dev);
3584 break;
3585 #endif
3586 case ARPHRD_LOOPBACK:
3587 init_loopback(dev);
3588 break;
3589
3590 default:
3591 addrconf_dev_config(dev);
3592 break;
3593 }
3594 }
3595
3596 static int fixup_permanent_addr(struct net *net,
3597 struct inet6_dev *idev,
3598 struct inet6_ifaddr *ifp)
3599 {
3600 /* !fib6_node means the host route was removed from the
3601 * FIB, for example, if 'lo' device is taken down. In that
3602 * case regenerate the host route.
3603 */
3604 if (!ifp->rt || !ifp->rt->fib6_node) {
3605 struct fib6_info *f6i, *prev;
3606
3607 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3608 GFP_ATOMIC, NULL);
3609 if (IS_ERR(f6i))
3610 return PTR_ERR(f6i);
3611
3612 /* ifp->rt can be accessed outside of rtnl */
3613 spin_lock(&ifp->lock);
3614 prev = ifp->rt;
3615 ifp->rt = f6i;
3616 spin_unlock(&ifp->lock);
3617
3618 fib6_info_release(prev);
3619 }
3620
3621 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3622 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3623 ifp->rt_priority, idev->dev, 0, 0,
3624 GFP_ATOMIC);
3625 }
3626
3627 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3628 addrconf_dad_start(ifp);
3629
3630 return 0;
3631 }
3632
3633 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3634 {
3635 struct inet6_ifaddr *ifp, *tmp;
3636 struct inet6_dev *idev;
3637
3638 idev = __in6_dev_get(dev);
3639 if (!idev)
3640 return;
3641
3642 write_lock_bh(&idev->lock);
3643
3644 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3645 if ((ifp->flags & IFA_F_PERMANENT) &&
3646 fixup_permanent_addr(net, idev, ifp) < 0) {
3647 write_unlock_bh(&idev->lock);
3648 in6_ifa_hold(ifp);
3649 ipv6_del_addr(ifp);
3650 write_lock_bh(&idev->lock);
3651
3652 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3653 idev->dev->name, &ifp->addr);
3654 }
3655 }
3656
3657 write_unlock_bh(&idev->lock);
3658 }
3659
3660 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3661 void *ptr)
3662 {
3663 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3664 struct netdev_notifier_change_info *change_info;
3665 struct netdev_notifier_changeupper_info *info;
3666 struct inet6_dev *idev = __in6_dev_get(dev);
3667 struct net *net = dev_net(dev);
3668 int run_pending = 0;
3669 int err;
3670
3671 switch (event) {
3672 case NETDEV_REGISTER:
3673 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3674 idev = ipv6_add_dev(dev);
3675 if (IS_ERR(idev))
3676 return notifier_from_errno(PTR_ERR(idev));
3677 }
3678 break;
3679
3680 case NETDEV_CHANGEMTU:
3681 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3682 if (dev->mtu < IPV6_MIN_MTU) {
3683 addrconf_ifdown(dev, dev != net->loopback_dev);
3684 break;
3685 }
3686
3687 if (idev) {
3688 rt6_mtu_change(dev, dev->mtu);
3689 WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3690 break;
3691 }
3692
3693 /* allocate new idev */
3694 idev = ipv6_add_dev(dev);
3695 if (IS_ERR(idev))
3696 break;
3697
3698 /* device is still not ready */
3699 if (!(idev->if_flags & IF_READY))
3700 break;
3701
3702 run_pending = 1;
3703 fallthrough;
3704 case NETDEV_UP:
3705 case NETDEV_CHANGE:
3706 if (idev && idev->cnf.disable_ipv6)
3707 break;
3708
3709 if (dev->priv_flags & IFF_NO_ADDRCONF) {
3710 if (event == NETDEV_UP && !IS_ERR_OR_NULL(idev) &&
3711 dev->flags & IFF_UP && dev->flags & IFF_MULTICAST)
3712 ipv6_mc_up(idev);
3713 break;
3714 }
3715
3716 if (event == NETDEV_UP) {
3717 /* restore routes for permanent addresses */
3718 addrconf_permanent_addr(net, dev);
3719
3720 if (!addrconf_link_ready(dev)) {
3721 /* device is not ready yet. */
3722 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3723 dev->name);
3724 break;
3725 }
3726
3727 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3728 idev = ipv6_add_dev(dev);
3729
3730 if (!IS_ERR_OR_NULL(idev)) {
3731 idev->if_flags |= IF_READY;
3732 run_pending = 1;
3733 }
3734 } else if (event == NETDEV_CHANGE) {
3735 if (!addrconf_link_ready(dev)) {
3736 /* device is still not ready. */
3737 rt6_sync_down_dev(dev, event);
3738 break;
3739 }
3740
3741 if (!IS_ERR_OR_NULL(idev)) {
3742 if (idev->if_flags & IF_READY) {
3743 /* device is already configured -
3744 * but resend MLD reports, we might
3745 * have roamed and need to update
3746 * multicast snooping switches
3747 */
3748 ipv6_mc_up(idev);
3749 change_info = ptr;
3750 if (change_info->flags_changed & IFF_NOARP)
3751 addrconf_dad_run(idev, true);
3752 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3753 break;
3754 }
3755 idev->if_flags |= IF_READY;
3756 }
3757
3758 pr_debug("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3759 dev->name);
3760
3761 run_pending = 1;
3762 }
3763
3764 addrconf_init_auto_addrs(dev);
3765
3766 if (!IS_ERR_OR_NULL(idev)) {
3767 if (run_pending)
3768 addrconf_dad_run(idev, false);
3769
3770 /* Device has an address by now */
3771 rt6_sync_up(dev, RTNH_F_DEAD);
3772
3773 /*
3774 * If the MTU changed during the interface down,
3775 * when the interface up, the changed MTU must be
3776 * reflected in the idev as well as routers.
3777 */
3778 if (idev->cnf.mtu6 != dev->mtu &&
3779 dev->mtu >= IPV6_MIN_MTU) {
3780 rt6_mtu_change(dev, dev->mtu);
3781 WRITE_ONCE(idev->cnf.mtu6, dev->mtu);
3782 }
3783 WRITE_ONCE(idev->tstamp, jiffies);
3784 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3785
3786 /*
3787 * If the changed mtu during down is lower than
3788 * IPV6_MIN_MTU stop IPv6 on this interface.
3789 */
3790 if (dev->mtu < IPV6_MIN_MTU)
3791 addrconf_ifdown(dev, dev != net->loopback_dev);
3792 }
3793 break;
3794
3795 case NETDEV_DOWN:
3796 case NETDEV_UNREGISTER:
3797 /*
3798 * Remove all addresses from this interface.
3799 */
3800 addrconf_ifdown(dev, event != NETDEV_DOWN);
3801 break;
3802
3803 case NETDEV_CHANGENAME:
3804 if (idev) {
3805 snmp6_unregister_dev(idev);
3806 addrconf_sysctl_unregister(idev);
3807 err = addrconf_sysctl_register(idev);
3808 if (err)
3809 return notifier_from_errno(err);
3810 err = snmp6_register_dev(idev);
3811 if (err) {
3812 addrconf_sysctl_unregister(idev);
3813 return notifier_from_errno(err);
3814 }
3815 }
3816 break;
3817
3818 case NETDEV_PRE_TYPE_CHANGE:
3819 case NETDEV_POST_TYPE_CHANGE:
3820 if (idev)
3821 addrconf_type_change(dev, event);
3822 break;
3823
3824 case NETDEV_CHANGEUPPER:
3825 info = ptr;
3826
3827 /* flush all routes if dev is linked to or unlinked from
3828 * an L3 master device (e.g., VRF)
3829 */
3830 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3831 addrconf_ifdown(dev, false);
3832 }
3833
3834 return NOTIFY_OK;
3835 }
3836
3837 /*
3838 * addrconf module should be notified of a device going up
3839 */
3840 static struct notifier_block ipv6_dev_notf = {
3841 .notifier_call = addrconf_notify,
3842 .priority = ADDRCONF_NOTIFY_PRIORITY,
3843 };
3844
3845 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3846 {
3847 struct inet6_dev *idev;
3848 ASSERT_RTNL();
3849
3850 idev = __in6_dev_get(dev);
3851
3852 if (event == NETDEV_POST_TYPE_CHANGE)
3853 ipv6_mc_remap(idev);
3854 else if (event == NETDEV_PRE_TYPE_CHANGE)
3855 ipv6_mc_unmap(idev);
3856 }
3857
3858 static bool addr_is_local(const struct in6_addr *addr)
3859 {
3860 return ipv6_addr_type(addr) &
3861 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3862 }
3863
3864 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3865 {
3866 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3867 struct net *net = dev_net(dev);
3868 struct inet6_dev *idev;
3869 struct inet6_ifaddr *ifa;
3870 LIST_HEAD(tmp_addr_list);
3871 bool keep_addr = false;
3872 bool was_ready;
3873 int state, i;
3874
3875 ASSERT_RTNL();
3876
3877 rt6_disable_ip(dev, event);
3878
3879 idev = __in6_dev_get(dev);
3880 if (!idev)
3881 return -ENODEV;
3882
3883 /*
3884 * Step 1: remove reference to ipv6 device from parent device.
3885 * Do not dev_put!
3886 */
3887 if (unregister) {
3888 idev->dead = 1;
3889
3890 /* protected by rtnl_lock */
3891 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3892
3893 /* Step 1.5: remove snmp6 entry */
3894 snmp6_unregister_dev(idev);
3895
3896 }
3897
3898 /* combine the user config with event to determine if permanent
3899 * addresses are to be removed from address hash table
3900 */
3901 if (!unregister && !idev->cnf.disable_ipv6) {
3902 /* aggregate the system setting and interface setting */
3903 int _keep_addr = READ_ONCE(net->ipv6.devconf_all->keep_addr_on_down);
3904
3905 if (!_keep_addr)
3906 _keep_addr = READ_ONCE(idev->cnf.keep_addr_on_down);
3907
3908 keep_addr = (_keep_addr > 0);
3909 }
3910
3911 /* Step 2: clear hash table */
3912 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3913 struct hlist_head *h = &net->ipv6.inet6_addr_lst[i];
3914
3915 spin_lock_bh(&net->ipv6.addrconf_hash_lock);
3916 restart:
3917 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3918 if (ifa->idev == idev) {
3919 addrconf_del_dad_work(ifa);
3920 /* combined flag + permanent flag decide if
3921 * address is retained on a down event
3922 */
3923 if (!keep_addr ||
3924 !(ifa->flags & IFA_F_PERMANENT) ||
3925 addr_is_local(&ifa->addr)) {
3926 hlist_del_init_rcu(&ifa->addr_lst);
3927 goto restart;
3928 }
3929 }
3930 }
3931 spin_unlock_bh(&net->ipv6.addrconf_hash_lock);
3932 }
3933
3934 write_lock_bh(&idev->lock);
3935
3936 addrconf_del_rs_timer(idev);
3937
3938 /* Step 2: clear flags for stateless addrconf, repeated down
3939 * detection
3940 */
3941 was_ready = idev->if_flags & IF_READY;
3942 if (!unregister)
3943 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3944
3945 /* Step 3: clear tempaddr list */
3946 while (!list_empty(&idev->tempaddr_list)) {
3947 ifa = list_first_entry(&idev->tempaddr_list,
3948 struct inet6_ifaddr, tmp_list);
3949 list_del(&ifa->tmp_list);
3950 write_unlock_bh(&idev->lock);
3951 spin_lock_bh(&ifa->lock);
3952
3953 if (ifa->ifpub) {
3954 in6_ifa_put(ifa->ifpub);
3955 ifa->ifpub = NULL;
3956 }
3957 spin_unlock_bh(&ifa->lock);
3958 in6_ifa_put(ifa);
3959 write_lock_bh(&idev->lock);
3960 }
3961
3962 list_for_each_entry(ifa, &idev->addr_list, if_list)
3963 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3964 write_unlock_bh(&idev->lock);
3965
3966 while (!list_empty(&tmp_addr_list)) {
3967 struct fib6_info *rt = NULL;
3968 bool keep;
3969
3970 ifa = list_first_entry(&tmp_addr_list,
3971 struct inet6_ifaddr, if_list_aux);
3972 list_del(&ifa->if_list_aux);
3973
3974 addrconf_del_dad_work(ifa);
3975
3976 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3977 !addr_is_local(&ifa->addr);
3978
3979 spin_lock_bh(&ifa->lock);
3980
3981 if (keep) {
3982 /* set state to skip the notifier below */
3983 state = INET6_IFADDR_STATE_DEAD;
3984 ifa->state = INET6_IFADDR_STATE_PREDAD;
3985 if (!(ifa->flags & IFA_F_NODAD))
3986 ifa->flags |= IFA_F_TENTATIVE;
3987
3988 rt = ifa->rt;
3989 ifa->rt = NULL;
3990 } else {
3991 state = ifa->state;
3992 ifa->state = INET6_IFADDR_STATE_DEAD;
3993 }
3994
3995 spin_unlock_bh(&ifa->lock);
3996
3997 if (rt)
3998 ip6_del_rt(net, rt, false);
3999
4000 if (state != INET6_IFADDR_STATE_DEAD) {
4001 __ipv6_ifa_notify(RTM_DELADDR, ifa);
4002 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
4003 } else {
4004 if (idev->cnf.forwarding)
4005 addrconf_leave_anycast(ifa);
4006 addrconf_leave_solict(ifa->idev, &ifa->addr);
4007 }
4008
4009 if (!keep) {
4010 write_lock_bh(&idev->lock);
4011 list_del_rcu(&ifa->if_list);
4012 write_unlock_bh(&idev->lock);
4013 in6_ifa_put(ifa);
4014 }
4015 }
4016
4017 /* Step 5: Discard anycast and multicast list */
4018 if (unregister) {
4019 ipv6_ac_destroy_dev(idev);
4020 ipv6_mc_destroy_dev(idev);
4021 } else if (was_ready) {
4022 ipv6_mc_down(idev);
4023 }
4024
4025 WRITE_ONCE(idev->tstamp, jiffies);
4026 idev->ra_mtu = 0;
4027
4028 /* Last: Shot the device (if unregistered) */
4029 if (unregister) {
4030 addrconf_sysctl_unregister(idev);
4031 neigh_parms_release(&nd_tbl, idev->nd_parms);
4032 neigh_ifdown(&nd_tbl, dev);
4033 in6_dev_put(idev);
4034 }
4035 return 0;
4036 }
4037
4038 static void addrconf_rs_timer(struct timer_list *t)
4039 {
4040 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
4041 struct net_device *dev = idev->dev;
4042 struct in6_addr lladdr;
4043 int rtr_solicits;
4044
4045 write_lock(&idev->lock);
4046 if (idev->dead || !(idev->if_flags & IF_READY))
4047 goto out;
4048
4049 if (!ipv6_accept_ra(idev))
4050 goto out;
4051
4052 /* Announcement received after solicitation was sent */
4053 if (idev->if_flags & IF_RA_RCVD)
4054 goto out;
4055
4056 rtr_solicits = READ_ONCE(idev->cnf.rtr_solicits);
4057
4058 if (idev->rs_probes++ < rtr_solicits || rtr_solicits < 0) {
4059 write_unlock(&idev->lock);
4060 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4061 ndisc_send_rs(dev, &lladdr,
4062 &in6addr_linklocal_allrouters);
4063 else
4064 goto put;
4065
4066 write_lock(&idev->lock);
4067 idev->rs_interval = rfc3315_s14_backoff_update(
4068 idev->rs_interval,
4069 READ_ONCE(idev->cnf.rtr_solicit_max_interval));
4070 /* The wait after the last probe can be shorter */
4071 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
4072 READ_ONCE(idev->cnf.rtr_solicits)) ?
4073 READ_ONCE(idev->cnf.rtr_solicit_delay) :
4074 idev->rs_interval);
4075 } else {
4076 /*
4077 * Note: we do not support deprecated "all on-link"
4078 * assumption any longer.
4079 */
4080 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
4081 }
4082
4083 out:
4084 write_unlock(&idev->lock);
4085 put:
4086 in6_dev_put(idev);
4087 }
4088
4089 /*
4090 * Duplicate Address Detection
4091 */
4092 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
4093 {
4094 struct inet6_dev *idev = ifp->idev;
4095 unsigned long rand_num;
4096 u64 nonce;
4097
4098 if (ifp->flags & IFA_F_OPTIMISTIC)
4099 rand_num = 0;
4100 else
4101 rand_num = get_random_u32_below(
4102 READ_ONCE(idev->cnf.rtr_solicit_delay) ? : 1);
4103
4104 nonce = 0;
4105 if (READ_ONCE(idev->cnf.enhanced_dad) ||
4106 READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad)) {
4107 do
4108 get_random_bytes(&nonce, 6);
4109 while (nonce == 0);
4110 }
4111 ifp->dad_nonce = nonce;
4112 ifp->dad_probes = READ_ONCE(idev->cnf.dad_transmits);
4113 addrconf_mod_dad_work(ifp, rand_num);
4114 }
4115
4116 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
4117 {
4118 struct inet6_dev *idev = ifp->idev;
4119 struct net_device *dev = idev->dev;
4120 bool bump_id, notify = false;
4121 struct net *net;
4122
4123 addrconf_join_solict(dev, &ifp->addr);
4124
4125 read_lock_bh(&idev->lock);
4126 spin_lock(&ifp->lock);
4127 if (ifp->state == INET6_IFADDR_STATE_DEAD)
4128 goto out;
4129
4130 net = dev_net(dev);
4131 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4132 (READ_ONCE(net->ipv6.devconf_all->accept_dad) < 1 &&
4133 READ_ONCE(idev->cnf.accept_dad) < 1) ||
4134 !(ifp->flags&IFA_F_TENTATIVE) ||
4135 ifp->flags & IFA_F_NODAD) {
4136 bool send_na = false;
4137
4138 if (ifp->flags & IFA_F_TENTATIVE &&
4139 !(ifp->flags & IFA_F_OPTIMISTIC))
4140 send_na = true;
4141 bump_id = ifp->flags & IFA_F_TENTATIVE;
4142 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4143 spin_unlock(&ifp->lock);
4144 read_unlock_bh(&idev->lock);
4145
4146 addrconf_dad_completed(ifp, bump_id, send_na);
4147 return;
4148 }
4149
4150 if (!(idev->if_flags & IF_READY)) {
4151 spin_unlock(&ifp->lock);
4152 read_unlock_bh(&idev->lock);
4153 /*
4154 * If the device is not ready:
4155 * - keep it tentative if it is a permanent address.
4156 * - otherwise, kill it.
4157 */
4158 in6_ifa_hold(ifp);
4159 addrconf_dad_stop(ifp, 0);
4160 return;
4161 }
4162
4163 /*
4164 * Optimistic nodes can start receiving
4165 * Frames right away
4166 */
4167 if (ifp->flags & IFA_F_OPTIMISTIC) {
4168 ip6_ins_rt(net, ifp->rt);
4169 if (ipv6_use_optimistic_addr(net, idev)) {
4170 /* Because optimistic nodes can use this address,
4171 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4172 */
4173 notify = true;
4174 }
4175 }
4176
4177 addrconf_dad_kick(ifp);
4178 out:
4179 spin_unlock(&ifp->lock);
4180 read_unlock_bh(&idev->lock);
4181 if (notify)
4182 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4183 }
4184
4185 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4186 {
4187 bool begin_dad = false;
4188
4189 spin_lock_bh(&ifp->lock);
4190 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4191 ifp->state = INET6_IFADDR_STATE_PREDAD;
4192 begin_dad = true;
4193 }
4194 spin_unlock_bh(&ifp->lock);
4195
4196 if (begin_dad)
4197 addrconf_mod_dad_work(ifp, 0);
4198 }
4199
4200 static void addrconf_dad_work(struct work_struct *w)
4201 {
4202 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4203 struct inet6_ifaddr,
4204 dad_work);
4205 struct inet6_dev *idev = ifp->idev;
4206 bool bump_id, disable_ipv6 = false;
4207 struct in6_addr mcaddr;
4208
4209 enum {
4210 DAD_PROCESS,
4211 DAD_BEGIN,
4212 DAD_ABORT,
4213 } action = DAD_PROCESS;
4214
4215 rtnl_lock();
4216
4217 spin_lock_bh(&ifp->lock);
4218 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4219 action = DAD_BEGIN;
4220 ifp->state = INET6_IFADDR_STATE_DAD;
4221 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4222 action = DAD_ABORT;
4223 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4224
4225 if ((READ_ONCE(dev_net(idev->dev)->ipv6.devconf_all->accept_dad) > 1 ||
4226 READ_ONCE(idev->cnf.accept_dad) > 1) &&
4227 !idev->cnf.disable_ipv6 &&
4228 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4229 struct in6_addr addr;
4230
4231 addr.s6_addr32[0] = htonl(0xfe800000);
4232 addr.s6_addr32[1] = 0;
4233
4234 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4235 ipv6_addr_equal(&ifp->addr, &addr)) {
4236 /* DAD failed for link-local based on MAC */
4237 WRITE_ONCE(idev->cnf.disable_ipv6, 1);
4238
4239 pr_info("%s: IPv6 being disabled!\n",
4240 ifp->idev->dev->name);
4241 disable_ipv6 = true;
4242 }
4243 }
4244 }
4245 spin_unlock_bh(&ifp->lock);
4246
4247 if (action == DAD_BEGIN) {
4248 addrconf_dad_begin(ifp);
4249 goto out;
4250 } else if (action == DAD_ABORT) {
4251 in6_ifa_hold(ifp);
4252 addrconf_dad_stop(ifp, 1);
4253 if (disable_ipv6)
4254 addrconf_ifdown(idev->dev, false);
4255 goto out;
4256 }
4257
4258 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4259 goto out;
4260
4261 write_lock_bh(&idev->lock);
4262 if (idev->dead || !(idev->if_flags & IF_READY)) {
4263 write_unlock_bh(&idev->lock);
4264 goto out;
4265 }
4266
4267 spin_lock(&ifp->lock);
4268 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4269 spin_unlock(&ifp->lock);
4270 write_unlock_bh(&idev->lock);
4271 goto out;
4272 }
4273
4274 if (ifp->dad_probes == 0) {
4275 bool send_na = false;
4276
4277 /*
4278 * DAD was successful
4279 */
4280
4281 if (ifp->flags & IFA_F_TENTATIVE &&
4282 !(ifp->flags & IFA_F_OPTIMISTIC))
4283 send_na = true;
4284 bump_id = ifp->flags & IFA_F_TENTATIVE;
4285 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4286 spin_unlock(&ifp->lock);
4287 write_unlock_bh(&idev->lock);
4288
4289 addrconf_dad_completed(ifp, bump_id, send_na);
4290
4291 goto out;
4292 }
4293
4294 ifp->dad_probes--;
4295 addrconf_mod_dad_work(ifp,
4296 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4297 HZ/100));
4298 spin_unlock(&ifp->lock);
4299 write_unlock_bh(&idev->lock);
4300
4301 /* send a neighbour solicitation for our addr */
4302 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4303 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4304 ifp->dad_nonce);
4305 out:
4306 in6_ifa_put(ifp);
4307 rtnl_unlock();
4308 }
4309
4310 /* ifp->idev must be at least read locked */
4311 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4312 {
4313 struct inet6_ifaddr *ifpiter;
4314 struct inet6_dev *idev = ifp->idev;
4315
4316 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4317 if (ifpiter->scope > IFA_LINK)
4318 break;
4319 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4320 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4321 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4322 IFA_F_PERMANENT)
4323 return false;
4324 }
4325 return true;
4326 }
4327
4328 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4329 bool send_na)
4330 {
4331 struct net_device *dev = ifp->idev->dev;
4332 struct in6_addr lladdr;
4333 bool send_rs, send_mld;
4334
4335 addrconf_del_dad_work(ifp);
4336
4337 /*
4338 * Configure the address for reception. Now it is valid.
4339 */
4340
4341 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4342
4343 /* If added prefix is link local and we are prepared to process
4344 router advertisements, start sending router solicitations.
4345 */
4346
4347 read_lock_bh(&ifp->idev->lock);
4348 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4349 send_rs = send_mld &&
4350 ipv6_accept_ra(ifp->idev) &&
4351 READ_ONCE(ifp->idev->cnf.rtr_solicits) != 0 &&
4352 (dev->flags & IFF_LOOPBACK) == 0 &&
4353 (dev->type != ARPHRD_TUNNEL) &&
4354 !netif_is_team_port(dev);
4355 read_unlock_bh(&ifp->idev->lock);
4356
4357 /* While dad is in progress mld report's source address is in6_addrany.
4358 * Resend with proper ll now.
4359 */
4360 if (send_mld)
4361 ipv6_mc_dad_complete(ifp->idev);
4362
4363 /* send unsolicited NA if enabled */
4364 if (send_na &&
4365 (READ_ONCE(ifp->idev->cnf.ndisc_notify) ||
4366 READ_ONCE(dev_net(dev)->ipv6.devconf_all->ndisc_notify))) {
4367 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4368 /*router=*/ !!ifp->idev->cnf.forwarding,
4369 /*solicited=*/ false, /*override=*/ true,
4370 /*inc_opt=*/ true);
4371 }
4372
4373 if (send_rs) {
4374 /*
4375 * If a host as already performed a random delay
4376 * [...] as part of DAD [...] there is no need
4377 * to delay again before sending the first RS
4378 */
4379 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4380 return;
4381 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4382
4383 write_lock_bh(&ifp->idev->lock);
4384 spin_lock(&ifp->lock);
4385 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4386 READ_ONCE(ifp->idev->cnf.rtr_solicit_interval));
4387 ifp->idev->rs_probes = 1;
4388 ifp->idev->if_flags |= IF_RS_SENT;
4389 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4390 spin_unlock(&ifp->lock);
4391 write_unlock_bh(&ifp->idev->lock);
4392 }
4393
4394 if (bump_id)
4395 rt_genid_bump_ipv6(dev_net(dev));
4396
4397 /* Make sure that a new temporary address will be created
4398 * before this temporary address becomes deprecated.
4399 */
4400 if (ifp->flags & IFA_F_TEMPORARY)
4401 addrconf_verify_rtnl(dev_net(dev));
4402 }
4403
4404 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4405 {
4406 struct inet6_ifaddr *ifp;
4407
4408 read_lock_bh(&idev->lock);
4409 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4410 spin_lock(&ifp->lock);
4411 if ((ifp->flags & IFA_F_TENTATIVE &&
4412 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4413 if (restart)
4414 ifp->state = INET6_IFADDR_STATE_PREDAD;
4415 addrconf_dad_kick(ifp);
4416 }
4417 spin_unlock(&ifp->lock);
4418 }
4419 read_unlock_bh(&idev->lock);
4420 }
4421
4422 #ifdef CONFIG_PROC_FS
4423 struct if6_iter_state {
4424 struct seq_net_private p;
4425 int bucket;
4426 int offset;
4427 };
4428
4429 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4430 {
4431 struct if6_iter_state *state = seq->private;
4432 struct net *net = seq_file_net(seq);
4433 struct inet6_ifaddr *ifa = NULL;
4434 int p = 0;
4435
4436 /* initial bucket if pos is 0 */
4437 if (pos == 0) {
4438 state->bucket = 0;
4439 state->offset = 0;
4440 }
4441
4442 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4443 hlist_for_each_entry_rcu(ifa, &net->ipv6.inet6_addr_lst[state->bucket],
4444 addr_lst) {
4445 /* sync with offset */
4446 if (p < state->offset) {
4447 p++;
4448 continue;
4449 }
4450 return ifa;
4451 }
4452
4453 /* prepare for next bucket */
4454 state->offset = 0;
4455 p = 0;
4456 }
4457 return NULL;
4458 }
4459
4460 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4461 struct inet6_ifaddr *ifa)
4462 {
4463 struct if6_iter_state *state = seq->private;
4464 struct net *net = seq_file_net(seq);
4465
4466 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4467 state->offset++;
4468 return ifa;
4469 }
4470
4471 state->offset = 0;
4472 while (++state->bucket < IN6_ADDR_HSIZE) {
4473 hlist_for_each_entry_rcu(ifa,
4474 &net->ipv6.inet6_addr_lst[state->bucket], addr_lst) {
4475 return ifa;
4476 }
4477 }
4478
4479 return NULL;
4480 }
4481
4482 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4483 __acquires(rcu)
4484 {
4485 rcu_read_lock();
4486 return if6_get_first(seq, *pos);
4487 }
4488
4489 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4490 {
4491 struct inet6_ifaddr *ifa;
4492
4493 ifa = if6_get_next(seq, v);
4494 ++*pos;
4495 return ifa;
4496 }
4497
4498 static void if6_seq_stop(struct seq_file *seq, void *v)
4499 __releases(rcu)
4500 {
4501 rcu_read_unlock();
4502 }
4503
4504 static int if6_seq_show(struct seq_file *seq, void *v)
4505 {
4506 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4507 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4508 &ifp->addr,
4509 ifp->idev->dev->ifindex,
4510 ifp->prefix_len,
4511 ifp->scope,
4512 (u8) ifp->flags,
4513 ifp->idev->dev->name);
4514 return 0;
4515 }
4516
4517 static const struct seq_operations if6_seq_ops = {
4518 .start = if6_seq_start,
4519 .next = if6_seq_next,
4520 .show = if6_seq_show,
4521 .stop = if6_seq_stop,
4522 };
4523
4524 static int __net_init if6_proc_net_init(struct net *net)
4525 {
4526 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4527 sizeof(struct if6_iter_state)))
4528 return -ENOMEM;
4529 return 0;
4530 }
4531
4532 static void __net_exit if6_proc_net_exit(struct net *net)
4533 {
4534 remove_proc_entry("if_inet6", net->proc_net);
4535 }
4536
4537 static struct pernet_operations if6_proc_net_ops = {
4538 .init = if6_proc_net_init,
4539 .exit = if6_proc_net_exit,
4540 };
4541
4542 int __init if6_proc_init(void)
4543 {
4544 return register_pernet_subsys(&if6_proc_net_ops);
4545 }
4546
4547 void if6_proc_exit(void)
4548 {
4549 unregister_pernet_subsys(&if6_proc_net_ops);
4550 }
4551 #endif /* CONFIG_PROC_FS */
4552
4553 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4554 /* Check if address is a home address configured on any interface. */
4555 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4556 {
4557 unsigned int hash = inet6_addr_hash(net, addr);
4558 struct inet6_ifaddr *ifp = NULL;
4559 int ret = 0;
4560
4561 rcu_read_lock();
4562 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4563 if (ipv6_addr_equal(&ifp->addr, addr) &&
4564 (ifp->flags & IFA_F_HOMEADDRESS)) {
4565 ret = 1;
4566 break;
4567 }
4568 }
4569 rcu_read_unlock();
4570 return ret;
4571 }
4572 #endif
4573
4574 /* RFC6554 has some algorithm to avoid loops in segment routing by
4575 * checking if the segments contains any of a local interface address.
4576 *
4577 * Quote:
4578 *
4579 * To detect loops in the SRH, a router MUST determine if the SRH
4580 * includes multiple addresses assigned to any interface on that router.
4581 * If such addresses appear more than once and are separated by at least
4582 * one address not assigned to that router.
4583 */
4584 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4585 unsigned char nsegs)
4586 {
4587 const struct in6_addr *addr;
4588 int i, ret = 0, found = 0;
4589 struct inet6_ifaddr *ifp;
4590 bool separated = false;
4591 unsigned int hash;
4592 bool hash_found;
4593
4594 rcu_read_lock();
4595 for (i = 0; i < nsegs; i++) {
4596 addr = &segs[i];
4597 hash = inet6_addr_hash(net, addr);
4598
4599 hash_found = false;
4600 hlist_for_each_entry_rcu(ifp, &net->ipv6.inet6_addr_lst[hash], addr_lst) {
4601
4602 if (ipv6_addr_equal(&ifp->addr, addr)) {
4603 hash_found = true;
4604 break;
4605 }
4606 }
4607
4608 if (hash_found) {
4609 if (found > 1 && separated) {
4610 ret = 1;
4611 break;
4612 }
4613
4614 separated = false;
4615 found++;
4616 } else {
4617 separated = true;
4618 }
4619 }
4620 rcu_read_unlock();
4621
4622 return ret;
4623 }
4624
4625 /*
4626 * Periodic address status verification
4627 */
4628
4629 static void addrconf_verify_rtnl(struct net *net)
4630 {
4631 unsigned long now, next, next_sec, next_sched;
4632 struct inet6_ifaddr *ifp;
4633 int i;
4634
4635 ASSERT_RTNL();
4636
4637 rcu_read_lock_bh();
4638 now = jiffies;
4639 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4640
4641 cancel_delayed_work(&net->ipv6.addr_chk_work);
4642
4643 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4644 restart:
4645 hlist_for_each_entry_rcu_bh(ifp, &net->ipv6.inet6_addr_lst[i], addr_lst) {
4646 unsigned long age;
4647
4648 /* When setting preferred_lft to a value not zero or
4649 * infinity, while valid_lft is infinity
4650 * IFA_F_PERMANENT has a non-infinity life time.
4651 */
4652 if ((ifp->flags & IFA_F_PERMANENT) &&
4653 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4654 continue;
4655
4656 spin_lock(&ifp->lock);
4657 /* We try to batch several events at once. */
4658 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4659
4660 if ((ifp->flags&IFA_F_TEMPORARY) &&
4661 !(ifp->flags&IFA_F_TENTATIVE) &&
4662 ifp->prefered_lft != INFINITY_LIFE_TIME &&
4663 !ifp->regen_count && ifp->ifpub) {
4664 /* This is a non-regenerated temporary addr. */
4665
4666 unsigned long regen_advance = ipv6_get_regen_advance(ifp->idev);
4667
4668 if (age + regen_advance >= ifp->prefered_lft) {
4669 struct inet6_ifaddr *ifpub = ifp->ifpub;
4670 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4671 next = ifp->tstamp + ifp->prefered_lft * HZ;
4672
4673 ifp->regen_count++;
4674 in6_ifa_hold(ifp);
4675 in6_ifa_hold(ifpub);
4676 spin_unlock(&ifp->lock);
4677
4678 spin_lock(&ifpub->lock);
4679 ifpub->regen_count = 0;
4680 spin_unlock(&ifpub->lock);
4681 rcu_read_unlock_bh();
4682 ipv6_create_tempaddr(ifpub, true);
4683 in6_ifa_put(ifpub);
4684 in6_ifa_put(ifp);
4685 rcu_read_lock_bh();
4686 goto restart;
4687 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4688 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4689 }
4690
4691 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4692 age >= ifp->valid_lft) {
4693 spin_unlock(&ifp->lock);
4694 in6_ifa_hold(ifp);
4695 rcu_read_unlock_bh();
4696 ipv6_del_addr(ifp);
4697 rcu_read_lock_bh();
4698 goto restart;
4699 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4700 spin_unlock(&ifp->lock);
4701 continue;
4702 } else if (age >= ifp->prefered_lft) {
4703 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4704 int deprecate = 0;
4705
4706 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4707 deprecate = 1;
4708 ifp->flags |= IFA_F_DEPRECATED;
4709 }
4710
4711 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4712 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4713 next = ifp->tstamp + ifp->valid_lft * HZ;
4714
4715 spin_unlock(&ifp->lock);
4716
4717 if (deprecate) {
4718 in6_ifa_hold(ifp);
4719
4720 ipv6_ifa_notify(0, ifp);
4721 in6_ifa_put(ifp);
4722 goto restart;
4723 }
4724 } else {
4725 /* ifp->prefered_lft <= ifp->valid_lft */
4726 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4727 next = ifp->tstamp + ifp->prefered_lft * HZ;
4728 spin_unlock(&ifp->lock);
4729 }
4730 }
4731 }
4732
4733 next_sec = round_jiffies_up(next);
4734 next_sched = next;
4735
4736 /* If rounded timeout is accurate enough, accept it. */
4737 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4738 next_sched = next_sec;
4739
4740 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4741 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4742 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4743
4744 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4745 now, next, next_sec, next_sched);
4746 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, next_sched - now);
4747 rcu_read_unlock_bh();
4748 }
4749
4750 static void addrconf_verify_work(struct work_struct *w)
4751 {
4752 struct net *net = container_of(to_delayed_work(w), struct net,
4753 ipv6.addr_chk_work);
4754
4755 rtnl_lock();
4756 addrconf_verify_rtnl(net);
4757 rtnl_unlock();
4758 }
4759
4760 static void addrconf_verify(struct net *net)
4761 {
4762 mod_delayed_work(addrconf_wq, &net->ipv6.addr_chk_work, 0);
4763 }
4764
4765 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4766 struct in6_addr **peer_pfx)
4767 {
4768 struct in6_addr *pfx = NULL;
4769
4770 *peer_pfx = NULL;
4771
4772 if (addr)
4773 pfx = nla_data(addr);
4774
4775 if (local) {
4776 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4777 *peer_pfx = pfx;
4778 pfx = nla_data(local);
4779 }
4780
4781 return pfx;
4782 }
4783
4784 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4785 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4786 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4787 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4788 [IFA_FLAGS] = { .len = sizeof(u32) },
4789 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4790 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4791 [IFA_PROTO] = { .type = NLA_U8 },
4792 };
4793
4794 static int
4795 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4796 struct netlink_ext_ack *extack)
4797 {
4798 struct net *net = sock_net(skb->sk);
4799 struct ifaddrmsg *ifm;
4800 struct nlattr *tb[IFA_MAX+1];
4801 struct in6_addr *pfx, *peer_pfx;
4802 u32 ifa_flags;
4803 int err;
4804
4805 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4806 ifa_ipv6_policy, extack);
4807 if (err < 0)
4808 return err;
4809
4810 ifm = nlmsg_data(nlh);
4811 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4812 if (!pfx)
4813 return -EINVAL;
4814
4815 ifa_flags = nla_get_u32_default(tb[IFA_FLAGS], ifm->ifa_flags);
4816
4817 /* We ignore other flags so far. */
4818 ifa_flags &= IFA_F_MANAGETEMPADDR;
4819
4820 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4821 ifm->ifa_prefixlen, extack);
4822 }
4823
4824 static int modify_prefix_route(struct net *net, struct inet6_ifaddr *ifp,
4825 unsigned long expires, u32 flags,
4826 bool modify_peer)
4827 {
4828 struct fib6_table *table;
4829 struct fib6_info *f6i;
4830 u32 prio;
4831
4832 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4833 ifp->prefix_len,
4834 ifp->idev->dev, 0, RTF_DEFAULT, true);
4835 if (!f6i)
4836 return -ENOENT;
4837
4838 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4839 if (f6i->fib6_metric != prio) {
4840 /* delete old one */
4841 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4842
4843 /* add new one */
4844 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4845 ifp->prefix_len,
4846 ifp->rt_priority, ifp->idev->dev,
4847 expires, flags, GFP_KERNEL);
4848 return 0;
4849 }
4850 if (f6i != net->ipv6.fib6_null_entry) {
4851 table = f6i->fib6_table;
4852 spin_lock_bh(&table->tb6_lock);
4853
4854 if (!(flags & RTF_EXPIRES)) {
4855 fib6_clean_expires(f6i);
4856 fib6_remove_gc_list(f6i);
4857 } else {
4858 fib6_set_expires(f6i, expires);
4859 fib6_add_gc_list(f6i);
4860 }
4861
4862 spin_unlock_bh(&table->tb6_lock);
4863 }
4864 fib6_info_release(f6i);
4865
4866 return 0;
4867 }
4868
4869 static int inet6_addr_modify(struct net *net, struct inet6_ifaddr *ifp,
4870 struct ifa6_config *cfg)
4871 {
4872 u32 flags;
4873 clock_t expires;
4874 unsigned long timeout;
4875 bool was_managetempaddr;
4876 bool had_prefixroute;
4877 bool new_peer = false;
4878
4879 ASSERT_RTNL();
4880
4881 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4882 return -EINVAL;
4883
4884 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4885 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4886 return -EINVAL;
4887
4888 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4889 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4890
4891 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4892 if (addrconf_finite_timeout(timeout)) {
4893 expires = jiffies_to_clock_t(timeout * HZ);
4894 cfg->valid_lft = timeout;
4895 flags = RTF_EXPIRES;
4896 } else {
4897 expires = 0;
4898 flags = 0;
4899 cfg->ifa_flags |= IFA_F_PERMANENT;
4900 }
4901
4902 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4903 if (addrconf_finite_timeout(timeout)) {
4904 if (timeout == 0)
4905 cfg->ifa_flags |= IFA_F_DEPRECATED;
4906 cfg->preferred_lft = timeout;
4907 }
4908
4909 if (cfg->peer_pfx &&
4910 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4911 if (!ipv6_addr_any(&ifp->peer_addr))
4912 cleanup_prefix_route(ifp, expires, true, true);
4913 new_peer = true;
4914 }
4915
4916 spin_lock_bh(&ifp->lock);
4917 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4918 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4919 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4920 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4921 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4922 IFA_F_NOPREFIXROUTE);
4923 ifp->flags |= cfg->ifa_flags;
4924 WRITE_ONCE(ifp->tstamp, jiffies);
4925 WRITE_ONCE(ifp->valid_lft, cfg->valid_lft);
4926 WRITE_ONCE(ifp->prefered_lft, cfg->preferred_lft);
4927 WRITE_ONCE(ifp->ifa_proto, cfg->ifa_proto);
4928
4929 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4930 WRITE_ONCE(ifp->rt_priority, cfg->rt_priority);
4931
4932 if (new_peer)
4933 ifp->peer_addr = *cfg->peer_pfx;
4934
4935 spin_unlock_bh(&ifp->lock);
4936 if (!(ifp->flags&IFA_F_TENTATIVE))
4937 ipv6_ifa_notify(0, ifp);
4938
4939 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4940 int rc = -ENOENT;
4941
4942 if (had_prefixroute)
4943 rc = modify_prefix_route(net, ifp, expires, flags, false);
4944
4945 /* prefix route could have been deleted; if so restore it */
4946 if (rc == -ENOENT) {
4947 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4948 ifp->rt_priority, ifp->idev->dev,
4949 expires, flags, GFP_KERNEL);
4950 }
4951
4952 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4953 rc = modify_prefix_route(net, ifp, expires, flags, true);
4954
4955 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4956 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4957 ifp->rt_priority, ifp->idev->dev,
4958 expires, flags, GFP_KERNEL);
4959 }
4960 } else if (had_prefixroute) {
4961 enum cleanup_prefix_rt_t action;
4962 unsigned long rt_expires;
4963
4964 write_lock_bh(&ifp->idev->lock);
4965 action = check_cleanup_prefix_route(ifp, &rt_expires);
4966 write_unlock_bh(&ifp->idev->lock);
4967
4968 if (action != CLEANUP_PREFIX_RT_NOP) {
4969 cleanup_prefix_route(ifp, rt_expires,
4970 action == CLEANUP_PREFIX_RT_DEL, false);
4971 }
4972 }
4973
4974 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4975 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4976 delete_tempaddrs(ifp->idev, ifp);
4977 else
4978 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4979 cfg->preferred_lft, !was_managetempaddr,
4980 jiffies);
4981 }
4982
4983 addrconf_verify_rtnl(net);
4984
4985 return 0;
4986 }
4987
4988 static int
4989 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4990 struct netlink_ext_ack *extack)
4991 {
4992 struct net *net = sock_net(skb->sk);
4993 struct ifaddrmsg *ifm;
4994 struct nlattr *tb[IFA_MAX+1];
4995 struct in6_addr *peer_pfx;
4996 struct inet6_ifaddr *ifa;
4997 struct net_device *dev;
4998 struct inet6_dev *idev;
4999 struct ifa6_config cfg;
5000 int err;
5001
5002 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5003 ifa_ipv6_policy, extack);
5004 if (err < 0)
5005 return err;
5006
5007 memset(&cfg, 0, sizeof(cfg));
5008
5009 ifm = nlmsg_data(nlh);
5010 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
5011 if (!cfg.pfx)
5012 return -EINVAL;
5013
5014 cfg.peer_pfx = peer_pfx;
5015 cfg.plen = ifm->ifa_prefixlen;
5016 if (tb[IFA_RT_PRIORITY])
5017 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
5018
5019 if (tb[IFA_PROTO])
5020 cfg.ifa_proto = nla_get_u8(tb[IFA_PROTO]);
5021
5022 cfg.valid_lft = INFINITY_LIFE_TIME;
5023 cfg.preferred_lft = INFINITY_LIFE_TIME;
5024
5025 if (tb[IFA_CACHEINFO]) {
5026 struct ifa_cacheinfo *ci;
5027
5028 ci = nla_data(tb[IFA_CACHEINFO]);
5029 cfg.valid_lft = ci->ifa_valid;
5030 cfg.preferred_lft = ci->ifa_prefered;
5031 }
5032
5033 dev = __dev_get_by_index(net, ifm->ifa_index);
5034 if (!dev) {
5035 NL_SET_ERR_MSG_MOD(extack, "Unable to find the interface");
5036 return -ENODEV;
5037 }
5038
5039 cfg.ifa_flags = nla_get_u32_default(tb[IFA_FLAGS], ifm->ifa_flags);
5040
5041 /* We ignore other flags so far. */
5042 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
5043 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
5044 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
5045
5046 idev = ipv6_find_idev(dev);
5047 if (IS_ERR(idev))
5048 return PTR_ERR(idev);
5049
5050 if (!ipv6_allow_optimistic_dad(net, idev))
5051 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
5052
5053 if (cfg.ifa_flags & IFA_F_NODAD &&
5054 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
5055 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
5056 return -EINVAL;
5057 }
5058
5059 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
5060 if (!ifa) {
5061 /*
5062 * It would be best to check for !NLM_F_CREATE here but
5063 * userspace already relies on not having to provide this.
5064 */
5065 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
5066 }
5067
5068 if (nlh->nlmsg_flags & NLM_F_EXCL ||
5069 !(nlh->nlmsg_flags & NLM_F_REPLACE)) {
5070 NL_SET_ERR_MSG_MOD(extack, "address already assigned");
5071 err = -EEXIST;
5072 } else {
5073 err = inet6_addr_modify(net, ifa, &cfg);
5074 }
5075
5076 in6_ifa_put(ifa);
5077
5078 return err;
5079 }
5080
5081 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
5082 u8 scope, int ifindex)
5083 {
5084 struct ifaddrmsg *ifm;
5085
5086 ifm = nlmsg_data(nlh);
5087 ifm->ifa_family = AF_INET6;
5088 ifm->ifa_prefixlen = prefixlen;
5089 ifm->ifa_flags = flags;
5090 ifm->ifa_scope = scope;
5091 ifm->ifa_index = ifindex;
5092 }
5093
5094 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
5095 unsigned long tstamp, u32 preferred, u32 valid)
5096 {
5097 struct ifa_cacheinfo ci;
5098
5099 ci.cstamp = cstamp_delta(cstamp);
5100 ci.tstamp = cstamp_delta(tstamp);
5101 ci.ifa_prefered = preferred;
5102 ci.ifa_valid = valid;
5103
5104 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
5105 }
5106
5107 static inline int rt_scope(int ifa_scope)
5108 {
5109 if (ifa_scope & IFA_HOST)
5110 return RT_SCOPE_HOST;
5111 else if (ifa_scope & IFA_LINK)
5112 return RT_SCOPE_LINK;
5113 else if (ifa_scope & IFA_SITE)
5114 return RT_SCOPE_SITE;
5115 else
5116 return RT_SCOPE_UNIVERSE;
5117 }
5118
5119 static inline int inet6_ifaddr_msgsize(void)
5120 {
5121 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
5122 + nla_total_size(16) /* IFA_LOCAL */
5123 + nla_total_size(16) /* IFA_ADDRESS */
5124 + nla_total_size(sizeof(struct ifa_cacheinfo))
5125 + nla_total_size(4) /* IFA_FLAGS */
5126 + nla_total_size(1) /* IFA_PROTO */
5127 + nla_total_size(4) /* IFA_RT_PRIORITY */;
5128 }
5129
5130 enum addr_type_t {
5131 UNICAST_ADDR,
5132 MULTICAST_ADDR,
5133 ANYCAST_ADDR,
5134 };
5135
5136 struct inet6_fill_args {
5137 u32 portid;
5138 u32 seq;
5139 int event;
5140 unsigned int flags;
5141 int netnsid;
5142 int ifindex;
5143 enum addr_type_t type;
5144 };
5145
5146 static int inet6_fill_ifaddr(struct sk_buff *skb,
5147 const struct inet6_ifaddr *ifa,
5148 struct inet6_fill_args *args)
5149 {
5150 struct nlmsghdr *nlh;
5151 u32 preferred, valid;
5152 u32 flags, priority;
5153 u8 proto;
5154
5155 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5156 sizeof(struct ifaddrmsg), args->flags);
5157 if (!nlh)
5158 return -EMSGSIZE;
5159
5160 flags = READ_ONCE(ifa->flags);
5161 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
5162 ifa->idev->dev->ifindex);
5163
5164 if (args->netnsid >= 0 &&
5165 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5166 goto error;
5167
5168 preferred = READ_ONCE(ifa->prefered_lft);
5169 valid = READ_ONCE(ifa->valid_lft);
5170
5171 if (!((flags & IFA_F_PERMANENT) &&
5172 (preferred == INFINITY_LIFE_TIME))) {
5173 if (preferred != INFINITY_LIFE_TIME) {
5174 long tval = (jiffies - READ_ONCE(ifa->tstamp)) / HZ;
5175
5176 if (preferred > tval)
5177 preferred -= tval;
5178 else
5179 preferred = 0;
5180 if (valid != INFINITY_LIFE_TIME) {
5181 if (valid > tval)
5182 valid -= tval;
5183 else
5184 valid = 0;
5185 }
5186 }
5187 } else {
5188 preferred = INFINITY_LIFE_TIME;
5189 valid = INFINITY_LIFE_TIME;
5190 }
5191
5192 if (!ipv6_addr_any(&ifa->peer_addr)) {
5193 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5194 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5195 goto error;
5196 } else {
5197 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5198 goto error;
5199 }
5200
5201 priority = READ_ONCE(ifa->rt_priority);
5202 if (priority && nla_put_u32(skb, IFA_RT_PRIORITY, priority))
5203 goto error;
5204
5205 if (put_cacheinfo(skb, ifa->cstamp, READ_ONCE(ifa->tstamp),
5206 preferred, valid) < 0)
5207 goto error;
5208
5209 if (nla_put_u32(skb, IFA_FLAGS, flags) < 0)
5210 goto error;
5211
5212 proto = READ_ONCE(ifa->ifa_proto);
5213 if (proto && nla_put_u8(skb, IFA_PROTO, proto))
5214 goto error;
5215
5216 nlmsg_end(skb, nlh);
5217 return 0;
5218
5219 error:
5220 nlmsg_cancel(skb, nlh);
5221 return -EMSGSIZE;
5222 }
5223
5224 static int inet6_fill_ifmcaddr(struct sk_buff *skb,
5225 const struct ifmcaddr6 *ifmca,
5226 struct inet6_fill_args *args)
5227 {
5228 int ifindex = ifmca->idev->dev->ifindex;
5229 u8 scope = RT_SCOPE_UNIVERSE;
5230 struct nlmsghdr *nlh;
5231
5232 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5233 scope = RT_SCOPE_SITE;
5234
5235 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5236 sizeof(struct ifaddrmsg), args->flags);
5237 if (!nlh)
5238 return -EMSGSIZE;
5239
5240 if (args->netnsid >= 0 &&
5241 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5242 nlmsg_cancel(skb, nlh);
5243 return -EMSGSIZE;
5244 }
5245
5246 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5247 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5248 put_cacheinfo(skb, ifmca->mca_cstamp, READ_ONCE(ifmca->mca_tstamp),
5249 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5250 nlmsg_cancel(skb, nlh);
5251 return -EMSGSIZE;
5252 }
5253
5254 nlmsg_end(skb, nlh);
5255 return 0;
5256 }
5257
5258 static int inet6_fill_ifacaddr(struct sk_buff *skb,
5259 const struct ifacaddr6 *ifaca,
5260 struct inet6_fill_args *args)
5261 {
5262 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5263 int ifindex = dev ? dev->ifindex : 1;
5264 u8 scope = RT_SCOPE_UNIVERSE;
5265 struct nlmsghdr *nlh;
5266
5267 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5268 scope = RT_SCOPE_SITE;
5269
5270 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5271 sizeof(struct ifaddrmsg), args->flags);
5272 if (!nlh)
5273 return -EMSGSIZE;
5274
5275 if (args->netnsid >= 0 &&
5276 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5277 nlmsg_cancel(skb, nlh);
5278 return -EMSGSIZE;
5279 }
5280
5281 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5282 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5283 put_cacheinfo(skb, ifaca->aca_cstamp, READ_ONCE(ifaca->aca_tstamp),
5284 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5285 nlmsg_cancel(skb, nlh);
5286 return -EMSGSIZE;
5287 }
5288
5289 nlmsg_end(skb, nlh);
5290 return 0;
5291 }
5292
5293 /* called with rcu_read_lock() */
5294 static int in6_dump_addrs(const struct inet6_dev *idev, struct sk_buff *skb,
5295 struct netlink_callback *cb, int *s_ip_idx,
5296 struct inet6_fill_args *fillargs)
5297 {
5298 const struct ifmcaddr6 *ifmca;
5299 const struct ifacaddr6 *ifaca;
5300 int ip_idx = 0;
5301 int err = 0;
5302
5303 switch (fillargs->type) {
5304 case UNICAST_ADDR: {
5305 const struct inet6_ifaddr *ifa;
5306 fillargs->event = RTM_NEWADDR;
5307
5308 /* unicast address incl. temp addr */
5309 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
5310 if (ip_idx < *s_ip_idx)
5311 goto next;
5312 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5313 if (err < 0)
5314 break;
5315 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5316 next:
5317 ip_idx++;
5318 }
5319 break;
5320 }
5321 case MULTICAST_ADDR:
5322 fillargs->event = RTM_GETMULTICAST;
5323
5324 /* multicast address */
5325 for (ifmca = rcu_dereference(idev->mc_list);
5326 ifmca;
5327 ifmca = rcu_dereference(ifmca->next), ip_idx++) {
5328 if (ip_idx < *s_ip_idx)
5329 continue;
5330 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5331 if (err < 0)
5332 break;
5333 }
5334 break;
5335 case ANYCAST_ADDR:
5336 fillargs->event = RTM_GETANYCAST;
5337 /* anycast address */
5338 for (ifaca = rcu_dereference(idev->ac_list); ifaca;
5339 ifaca = rcu_dereference(ifaca->aca_next), ip_idx++) {
5340 if (ip_idx < *s_ip_idx)
5341 continue;
5342 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5343 if (err < 0)
5344 break;
5345 }
5346 break;
5347 default:
5348 break;
5349 }
5350 *s_ip_idx = err ? ip_idx : 0;
5351 return err;
5352 }
5353
5354 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5355 struct inet6_fill_args *fillargs,
5356 struct net **tgt_net, struct sock *sk,
5357 struct netlink_callback *cb)
5358 {
5359 struct netlink_ext_ack *extack = cb->extack;
5360 struct nlattr *tb[IFA_MAX+1];
5361 struct ifaddrmsg *ifm;
5362 int err, i;
5363
5364 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5365 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5366 return -EINVAL;
5367 }
5368
5369 ifm = nlmsg_data(nlh);
5370 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5371 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5372 return -EINVAL;
5373 }
5374
5375 fillargs->ifindex = ifm->ifa_index;
5376 if (fillargs->ifindex) {
5377 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5378 fillargs->flags |= NLM_F_DUMP_FILTERED;
5379 }
5380
5381 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5382 ifa_ipv6_policy, extack);
5383 if (err < 0)
5384 return err;
5385
5386 for (i = 0; i <= IFA_MAX; ++i) {
5387 if (!tb[i])
5388 continue;
5389
5390 if (i == IFA_TARGET_NETNSID) {
5391 struct net *net;
5392
5393 fillargs->netnsid = nla_get_s32(tb[i]);
5394 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5395 if (IS_ERR(net)) {
5396 fillargs->netnsid = -1;
5397 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5398 return PTR_ERR(net);
5399 }
5400 *tgt_net = net;
5401 } else {
5402 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5403 return -EINVAL;
5404 }
5405 }
5406
5407 return 0;
5408 }
5409
5410 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5411 enum addr_type_t type)
5412 {
5413 struct net *tgt_net = sock_net(skb->sk);
5414 const struct nlmsghdr *nlh = cb->nlh;
5415 struct inet6_fill_args fillargs = {
5416 .portid = NETLINK_CB(cb->skb).portid,
5417 .seq = cb->nlh->nlmsg_seq,
5418 .flags = NLM_F_MULTI,
5419 .netnsid = -1,
5420 .type = type,
5421 };
5422 struct {
5423 unsigned long ifindex;
5424 int ip_idx;
5425 } *ctx = (void *)cb->ctx;
5426 struct net_device *dev;
5427 struct inet6_dev *idev;
5428 int err = 0;
5429
5430 rcu_read_lock();
5431 if (cb->strict_check) {
5432 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5433 skb->sk, cb);
5434 if (err < 0)
5435 goto done;
5436
5437 err = 0;
5438 if (fillargs.ifindex) {
5439 dev = dev_get_by_index_rcu(tgt_net, fillargs.ifindex);
5440 if (!dev) {
5441 err = -ENODEV;
5442 goto done;
5443 }
5444 idev = __in6_dev_get(dev);
5445 if (idev)
5446 err = in6_dump_addrs(idev, skb, cb,
5447 &ctx->ip_idx,
5448 &fillargs);
5449 goto done;
5450 }
5451 }
5452
5453 cb->seq = inet6_base_seq(tgt_net);
5454 for_each_netdev_dump(tgt_net, dev, ctx->ifindex) {
5455 idev = __in6_dev_get(dev);
5456 if (!idev)
5457 continue;
5458 err = in6_dump_addrs(idev, skb, cb, &ctx->ip_idx,
5459 &fillargs);
5460 if (err < 0)
5461 goto done;
5462 }
5463 done:
5464 rcu_read_unlock();
5465 if (fillargs.netnsid >= 0)
5466 put_net(tgt_net);
5467
5468 return err;
5469 }
5470
5471 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5472 {
5473 enum addr_type_t type = UNICAST_ADDR;
5474
5475 return inet6_dump_addr(skb, cb, type);
5476 }
5477
5478 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5479 {
5480 enum addr_type_t type = MULTICAST_ADDR;
5481
5482 return inet6_dump_addr(skb, cb, type);
5483 }
5484
5485
5486 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5487 {
5488 enum addr_type_t type = ANYCAST_ADDR;
5489
5490 return inet6_dump_addr(skb, cb, type);
5491 }
5492
5493 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5494 const struct nlmsghdr *nlh,
5495 struct nlattr **tb,
5496 struct netlink_ext_ack *extack)
5497 {
5498 struct ifaddrmsg *ifm;
5499 int i, err;
5500
5501 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5502 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5503 return -EINVAL;
5504 }
5505
5506 if (!netlink_strict_get_check(skb))
5507 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5508 ifa_ipv6_policy, extack);
5509
5510 ifm = nlmsg_data(nlh);
5511 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5512 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5513 return -EINVAL;
5514 }
5515
5516 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5517 ifa_ipv6_policy, extack);
5518 if (err)
5519 return err;
5520
5521 for (i = 0; i <= IFA_MAX; i++) {
5522 if (!tb[i])
5523 continue;
5524
5525 switch (i) {
5526 case IFA_TARGET_NETNSID:
5527 case IFA_ADDRESS:
5528 case IFA_LOCAL:
5529 break;
5530 default:
5531 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5532 return -EINVAL;
5533 }
5534 }
5535
5536 return 0;
5537 }
5538
5539 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5540 struct netlink_ext_ack *extack)
5541 {
5542 struct net *tgt_net = sock_net(in_skb->sk);
5543 struct inet6_fill_args fillargs = {
5544 .portid = NETLINK_CB(in_skb).portid,
5545 .seq = nlh->nlmsg_seq,
5546 .event = RTM_NEWADDR,
5547 .flags = 0,
5548 .netnsid = -1,
5549 };
5550 struct ifaddrmsg *ifm;
5551 struct nlattr *tb[IFA_MAX+1];
5552 struct in6_addr *addr = NULL, *peer;
5553 struct net_device *dev = NULL;
5554 struct inet6_ifaddr *ifa;
5555 struct sk_buff *skb;
5556 int err;
5557
5558 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5559 if (err < 0)
5560 return err;
5561
5562 if (tb[IFA_TARGET_NETNSID]) {
5563 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5564
5565 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5566 fillargs.netnsid);
5567 if (IS_ERR(tgt_net))
5568 return PTR_ERR(tgt_net);
5569 }
5570
5571 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5572 if (!addr) {
5573 err = -EINVAL;
5574 goto errout;
5575 }
5576 ifm = nlmsg_data(nlh);
5577 if (ifm->ifa_index)
5578 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5579
5580 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5581 if (!ifa) {
5582 err = -EADDRNOTAVAIL;
5583 goto errout;
5584 }
5585
5586 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5587 if (!skb) {
5588 err = -ENOBUFS;
5589 goto errout_ifa;
5590 }
5591
5592 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5593 if (err < 0) {
5594 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5595 WARN_ON(err == -EMSGSIZE);
5596 kfree_skb(skb);
5597 goto errout_ifa;
5598 }
5599 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5600 errout_ifa:
5601 in6_ifa_put(ifa);
5602 errout:
5603 dev_put(dev);
5604 if (fillargs.netnsid >= 0)
5605 put_net(tgt_net);
5606
5607 return err;
5608 }
5609
5610 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5611 {
5612 struct sk_buff *skb;
5613 struct net *net = dev_net(ifa->idev->dev);
5614 struct inet6_fill_args fillargs = {
5615 .portid = 0,
5616 .seq = 0,
5617 .event = event,
5618 .flags = 0,
5619 .netnsid = -1,
5620 };
5621 int err = -ENOBUFS;
5622
5623 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5624 if (!skb)
5625 goto errout;
5626
5627 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5628 if (err < 0) {
5629 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5630 WARN_ON(err == -EMSGSIZE);
5631 kfree_skb(skb);
5632 goto errout;
5633 }
5634 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5635 return;
5636 errout:
5637 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5638 }
5639
5640 static void ipv6_store_devconf(const struct ipv6_devconf *cnf,
5641 __s32 *array, int bytes)
5642 {
5643 BUG_ON(bytes < (DEVCONF_MAX * 4));
5644
5645 memset(array, 0, bytes);
5646 array[DEVCONF_FORWARDING] = READ_ONCE(cnf->forwarding);
5647 array[DEVCONF_HOPLIMIT] = READ_ONCE(cnf->hop_limit);
5648 array[DEVCONF_MTU6] = READ_ONCE(cnf->mtu6);
5649 array[DEVCONF_ACCEPT_RA] = READ_ONCE(cnf->accept_ra);
5650 array[DEVCONF_ACCEPT_REDIRECTS] = READ_ONCE(cnf->accept_redirects);
5651 array[DEVCONF_AUTOCONF] = READ_ONCE(cnf->autoconf);
5652 array[DEVCONF_DAD_TRANSMITS] = READ_ONCE(cnf->dad_transmits);
5653 array[DEVCONF_RTR_SOLICITS] = READ_ONCE(cnf->rtr_solicits);
5654 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5655 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_interval));
5656 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5657 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_max_interval));
5658 array[DEVCONF_RTR_SOLICIT_DELAY] =
5659 jiffies_to_msecs(READ_ONCE(cnf->rtr_solicit_delay));
5660 array[DEVCONF_FORCE_MLD_VERSION] = READ_ONCE(cnf->force_mld_version);
5661 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5662 jiffies_to_msecs(READ_ONCE(cnf->mldv1_unsolicited_report_interval));
5663 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5664 jiffies_to_msecs(READ_ONCE(cnf->mldv2_unsolicited_report_interval));
5665 array[DEVCONF_USE_TEMPADDR] = READ_ONCE(cnf->use_tempaddr);
5666 array[DEVCONF_TEMP_VALID_LFT] = READ_ONCE(cnf->temp_valid_lft);
5667 array[DEVCONF_TEMP_PREFERED_LFT] = READ_ONCE(cnf->temp_prefered_lft);
5668 array[DEVCONF_REGEN_MAX_RETRY] = READ_ONCE(cnf->regen_max_retry);
5669 array[DEVCONF_MAX_DESYNC_FACTOR] = READ_ONCE(cnf->max_desync_factor);
5670 array[DEVCONF_MAX_ADDRESSES] = READ_ONCE(cnf->max_addresses);
5671 array[DEVCONF_ACCEPT_RA_DEFRTR] = READ_ONCE(cnf->accept_ra_defrtr);
5672 array[DEVCONF_RA_DEFRTR_METRIC] = READ_ONCE(cnf->ra_defrtr_metric);
5673 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] =
5674 READ_ONCE(cnf->accept_ra_min_hop_limit);
5675 array[DEVCONF_ACCEPT_RA_PINFO] = READ_ONCE(cnf->accept_ra_pinfo);
5676 #ifdef CONFIG_IPV6_ROUTER_PREF
5677 array[DEVCONF_ACCEPT_RA_RTR_PREF] = READ_ONCE(cnf->accept_ra_rtr_pref);
5678 array[DEVCONF_RTR_PROBE_INTERVAL] =
5679 jiffies_to_msecs(READ_ONCE(cnf->rtr_probe_interval));
5680 #ifdef CONFIG_IPV6_ROUTE_INFO
5681 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] =
5682 READ_ONCE(cnf->accept_ra_rt_info_min_plen);
5683 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] =
5684 READ_ONCE(cnf->accept_ra_rt_info_max_plen);
5685 #endif
5686 #endif
5687 array[DEVCONF_PROXY_NDP] = READ_ONCE(cnf->proxy_ndp);
5688 array[DEVCONF_ACCEPT_SOURCE_ROUTE] =
5689 READ_ONCE(cnf->accept_source_route);
5690 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5691 array[DEVCONF_OPTIMISTIC_DAD] = READ_ONCE(cnf->optimistic_dad);
5692 array[DEVCONF_USE_OPTIMISTIC] = READ_ONCE(cnf->use_optimistic);
5693 #endif
5694 #ifdef CONFIG_IPV6_MROUTE
5695 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5696 #endif
5697 array[DEVCONF_DISABLE_IPV6] = READ_ONCE(cnf->disable_ipv6);
5698 array[DEVCONF_ACCEPT_DAD] = READ_ONCE(cnf->accept_dad);
5699 array[DEVCONF_FORCE_TLLAO] = READ_ONCE(cnf->force_tllao);
5700 array[DEVCONF_NDISC_NOTIFY] = READ_ONCE(cnf->ndisc_notify);
5701 array[DEVCONF_SUPPRESS_FRAG_NDISC] =
5702 READ_ONCE(cnf->suppress_frag_ndisc);
5703 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] =
5704 READ_ONCE(cnf->accept_ra_from_local);
5705 array[DEVCONF_ACCEPT_RA_MTU] = READ_ONCE(cnf->accept_ra_mtu);
5706 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] =
5707 READ_ONCE(cnf->ignore_routes_with_linkdown);
5708 /* we omit DEVCONF_STABLE_SECRET for now */
5709 array[DEVCONF_USE_OIF_ADDRS_ONLY] = READ_ONCE(cnf->use_oif_addrs_only);
5710 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] =
5711 READ_ONCE(cnf->drop_unicast_in_l2_multicast);
5712 array[DEVCONF_DROP_UNSOLICITED_NA] = READ_ONCE(cnf->drop_unsolicited_na);
5713 array[DEVCONF_KEEP_ADDR_ON_DOWN] = READ_ONCE(cnf->keep_addr_on_down);
5714 array[DEVCONF_SEG6_ENABLED] = READ_ONCE(cnf->seg6_enabled);
5715 #ifdef CONFIG_IPV6_SEG6_HMAC
5716 array[DEVCONF_SEG6_REQUIRE_HMAC] = READ_ONCE(cnf->seg6_require_hmac);
5717 #endif
5718 array[DEVCONF_ENHANCED_DAD] = READ_ONCE(cnf->enhanced_dad);
5719 array[DEVCONF_ADDR_GEN_MODE] = READ_ONCE(cnf->addr_gen_mode);
5720 array[DEVCONF_DISABLE_POLICY] = READ_ONCE(cnf->disable_policy);
5721 array[DEVCONF_NDISC_TCLASS] = READ_ONCE(cnf->ndisc_tclass);
5722 array[DEVCONF_RPL_SEG_ENABLED] = READ_ONCE(cnf->rpl_seg_enabled);
5723 array[DEVCONF_IOAM6_ENABLED] = READ_ONCE(cnf->ioam6_enabled);
5724 array[DEVCONF_IOAM6_ID] = READ_ONCE(cnf->ioam6_id);
5725 array[DEVCONF_IOAM6_ID_WIDE] = READ_ONCE(cnf->ioam6_id_wide);
5726 array[DEVCONF_NDISC_EVICT_NOCARRIER] =
5727 READ_ONCE(cnf->ndisc_evict_nocarrier);
5728 array[DEVCONF_ACCEPT_UNTRACKED_NA] =
5729 READ_ONCE(cnf->accept_untracked_na);
5730 array[DEVCONF_ACCEPT_RA_MIN_LFT] = READ_ONCE(cnf->accept_ra_min_lft);
5731 }
5732
5733 static inline size_t inet6_ifla6_size(void)
5734 {
5735 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5736 + nla_total_size(sizeof(struct ifla_cacheinfo))
5737 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5738 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5739 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5740 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5741 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5742 + nla_total_size(4) /* IFLA_INET6_RA_MTU */
5743 + 0;
5744 }
5745
5746 static inline size_t inet6_if_nlmsg_size(void)
5747 {
5748 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5749 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5750 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5751 + nla_total_size(4) /* IFLA_MTU */
5752 + nla_total_size(4) /* IFLA_LINK */
5753 + nla_total_size(1) /* IFLA_OPERSTATE */
5754 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5755 }
5756
5757 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5758 int bytes)
5759 {
5760 int i;
5761 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5762 BUG_ON(pad < 0);
5763
5764 /* Use put_unaligned() because stats may not be aligned for u64. */
5765 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5766 for (i = 1; i < ICMP6_MIB_MAX; i++)
5767 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5768
5769 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5770 }
5771
5772 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5773 int bytes, size_t syncpoff)
5774 {
5775 int i, c;
5776 u64 buff[IPSTATS_MIB_MAX];
5777 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5778
5779 BUG_ON(pad < 0);
5780
5781 memset(buff, 0, sizeof(buff));
5782 buff[0] = IPSTATS_MIB_MAX;
5783
5784 for_each_possible_cpu(c) {
5785 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5786 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5787 }
5788
5789 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5790 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5791 }
5792
5793 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5794 int bytes)
5795 {
5796 switch (attrtype) {
5797 case IFLA_INET6_STATS:
5798 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5799 offsetof(struct ipstats_mib, syncp));
5800 break;
5801 case IFLA_INET6_ICMP6STATS:
5802 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5803 break;
5804 }
5805 }
5806
5807 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5808 u32 ext_filter_mask)
5809 {
5810 struct ifla_cacheinfo ci;
5811 struct nlattr *nla;
5812 u32 ra_mtu;
5813
5814 if (nla_put_u32(skb, IFLA_INET6_FLAGS, READ_ONCE(idev->if_flags)))
5815 goto nla_put_failure;
5816 ci.max_reasm_len = IPV6_MAXPLEN;
5817 ci.tstamp = cstamp_delta(READ_ONCE(idev->tstamp));
5818 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5819 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5820 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5821 goto nla_put_failure;
5822 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5823 if (!nla)
5824 goto nla_put_failure;
5825 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5826
5827 /* XXX - MC not implemented */
5828
5829 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5830 return 0;
5831
5832 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5833 if (!nla)
5834 goto nla_put_failure;
5835 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5836
5837 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5838 if (!nla)
5839 goto nla_put_failure;
5840 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5841
5842 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5843 if (!nla)
5844 goto nla_put_failure;
5845 read_lock_bh(&idev->lock);
5846 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5847 read_unlock_bh(&idev->lock);
5848
5849 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE,
5850 READ_ONCE(idev->cnf.addr_gen_mode)))
5851 goto nla_put_failure;
5852
5853 ra_mtu = READ_ONCE(idev->ra_mtu);
5854 if (ra_mtu && nla_put_u32(skb, IFLA_INET6_RA_MTU, ra_mtu))
5855 goto nla_put_failure;
5856
5857 return 0;
5858
5859 nla_put_failure:
5860 return -EMSGSIZE;
5861 }
5862
5863 static size_t inet6_get_link_af_size(const struct net_device *dev,
5864 u32 ext_filter_mask)
5865 {
5866 if (!__in6_dev_get(dev))
5867 return 0;
5868
5869 return inet6_ifla6_size();
5870 }
5871
5872 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5873 u32 ext_filter_mask)
5874 {
5875 struct inet6_dev *idev = __in6_dev_get(dev);
5876
5877 if (!idev)
5878 return -ENODATA;
5879
5880 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5881 return -EMSGSIZE;
5882
5883 return 0;
5884 }
5885
5886 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5887 struct netlink_ext_ack *extack)
5888 {
5889 struct inet6_ifaddr *ifp;
5890 struct net_device *dev = idev->dev;
5891 bool clear_token, update_rs = false;
5892 struct in6_addr ll_addr;
5893
5894 ASSERT_RTNL();
5895
5896 if (!token)
5897 return -EINVAL;
5898
5899 if (dev->flags & IFF_LOOPBACK) {
5900 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5901 return -EINVAL;
5902 }
5903
5904 if (dev->flags & IFF_NOARP) {
5905 NL_SET_ERR_MSG_MOD(extack,
5906 "Device does not do neighbour discovery");
5907 return -EINVAL;
5908 }
5909
5910 if (!ipv6_accept_ra(idev)) {
5911 NL_SET_ERR_MSG_MOD(extack,
5912 "Router advertisement is disabled on device");
5913 return -EINVAL;
5914 }
5915
5916 if (READ_ONCE(idev->cnf.rtr_solicits) == 0) {
5917 NL_SET_ERR_MSG(extack,
5918 "Router solicitation is disabled on device");
5919 return -EINVAL;
5920 }
5921
5922 write_lock_bh(&idev->lock);
5923
5924 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5925 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5926
5927 write_unlock_bh(&idev->lock);
5928
5929 clear_token = ipv6_addr_any(token);
5930 if (clear_token)
5931 goto update_lft;
5932
5933 if (!idev->dead && (idev->if_flags & IF_READY) &&
5934 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5935 IFA_F_OPTIMISTIC)) {
5936 /* If we're not ready, then normal ifup will take care
5937 * of this. Otherwise, we need to request our rs here.
5938 */
5939 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5940 update_rs = true;
5941 }
5942
5943 update_lft:
5944 write_lock_bh(&idev->lock);
5945
5946 if (update_rs) {
5947 idev->if_flags |= IF_RS_SENT;
5948 idev->rs_interval = rfc3315_s14_backoff_init(
5949 READ_ONCE(idev->cnf.rtr_solicit_interval));
5950 idev->rs_probes = 1;
5951 addrconf_mod_rs_timer(idev, idev->rs_interval);
5952 }
5953
5954 /* Well, that's kinda nasty ... */
5955 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5956 spin_lock(&ifp->lock);
5957 if (ifp->tokenized) {
5958 ifp->valid_lft = 0;
5959 ifp->prefered_lft = 0;
5960 }
5961 spin_unlock(&ifp->lock);
5962 }
5963
5964 write_unlock_bh(&idev->lock);
5965 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5966 addrconf_verify_rtnl(dev_net(dev));
5967 return 0;
5968 }
5969
5970 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5971 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5972 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5973 [IFLA_INET6_RA_MTU] = { .type = NLA_REJECT,
5974 .reject_message =
5975 "IFLA_INET6_RA_MTU can not be set" },
5976 };
5977
5978 static int check_addr_gen_mode(int mode)
5979 {
5980 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5981 mode != IN6_ADDR_GEN_MODE_NONE &&
5982 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5983 mode != IN6_ADDR_GEN_MODE_RANDOM)
5984 return -EINVAL;
5985 return 1;
5986 }
5987
5988 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5989 int mode)
5990 {
5991 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5992 !idev->cnf.stable_secret.initialized &&
5993 !net->ipv6.devconf_dflt->stable_secret.initialized)
5994 return -EINVAL;
5995 return 1;
5996 }
5997
5998 static int inet6_validate_link_af(const struct net_device *dev,
5999 const struct nlattr *nla,
6000 struct netlink_ext_ack *extack)
6001 {
6002 struct nlattr *tb[IFLA_INET6_MAX + 1];
6003 struct inet6_dev *idev = NULL;
6004 int err;
6005
6006 if (dev) {
6007 idev = __in6_dev_get(dev);
6008 if (!idev)
6009 return -EAFNOSUPPORT;
6010 }
6011
6012 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
6013 inet6_af_policy, extack);
6014 if (err)
6015 return err;
6016
6017 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
6018 return -EINVAL;
6019
6020 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6021 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6022
6023 if (check_addr_gen_mode(mode) < 0)
6024 return -EINVAL;
6025 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
6026 return -EINVAL;
6027 }
6028
6029 return 0;
6030 }
6031
6032 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla,
6033 struct netlink_ext_ack *extack)
6034 {
6035 struct inet6_dev *idev = __in6_dev_get(dev);
6036 struct nlattr *tb[IFLA_INET6_MAX + 1];
6037 int err;
6038
6039 if (!idev)
6040 return -EAFNOSUPPORT;
6041
6042 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
6043 return -EINVAL;
6044
6045 if (tb[IFLA_INET6_TOKEN]) {
6046 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]),
6047 extack);
6048 if (err)
6049 return err;
6050 }
6051
6052 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
6053 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
6054
6055 WRITE_ONCE(idev->cnf.addr_gen_mode, mode);
6056 }
6057
6058 return 0;
6059 }
6060
6061 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
6062 u32 portid, u32 seq, int event, unsigned int flags)
6063 {
6064 struct net_device *dev = idev->dev;
6065 struct ifinfomsg *hdr;
6066 struct nlmsghdr *nlh;
6067 int ifindex, iflink;
6068 void *protoinfo;
6069
6070 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
6071 if (!nlh)
6072 return -EMSGSIZE;
6073
6074 hdr = nlmsg_data(nlh);
6075 hdr->ifi_family = AF_INET6;
6076 hdr->__ifi_pad = 0;
6077 hdr->ifi_type = dev->type;
6078 ifindex = READ_ONCE(dev->ifindex);
6079 hdr->ifi_index = ifindex;
6080 hdr->ifi_flags = dev_get_flags(dev);
6081 hdr->ifi_change = 0;
6082
6083 iflink = dev_get_iflink(dev);
6084 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
6085 (dev->addr_len &&
6086 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
6087 nla_put_u32(skb, IFLA_MTU, READ_ONCE(dev->mtu)) ||
6088 (ifindex != iflink &&
6089 nla_put_u32(skb, IFLA_LINK, iflink)) ||
6090 nla_put_u8(skb, IFLA_OPERSTATE,
6091 netif_running(dev) ? READ_ONCE(dev->operstate) : IF_OPER_DOWN))
6092 goto nla_put_failure;
6093 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
6094 if (!protoinfo)
6095 goto nla_put_failure;
6096
6097 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
6098 goto nla_put_failure;
6099
6100 nla_nest_end(skb, protoinfo);
6101 nlmsg_end(skb, nlh);
6102 return 0;
6103
6104 nla_put_failure:
6105 nlmsg_cancel(skb, nlh);
6106 return -EMSGSIZE;
6107 }
6108
6109 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
6110 struct netlink_ext_ack *extack)
6111 {
6112 struct ifinfomsg *ifm;
6113
6114 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
6115 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
6116 return -EINVAL;
6117 }
6118
6119 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
6120 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
6121 return -EINVAL;
6122 }
6123
6124 ifm = nlmsg_data(nlh);
6125 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
6126 ifm->ifi_change || ifm->ifi_index) {
6127 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
6128 return -EINVAL;
6129 }
6130
6131 return 0;
6132 }
6133
6134 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
6135 {
6136 struct net *net = sock_net(skb->sk);
6137 struct {
6138 unsigned long ifindex;
6139 } *ctx = (void *)cb->ctx;
6140 struct net_device *dev;
6141 struct inet6_dev *idev;
6142 int err;
6143
6144 /* only requests using strict checking can pass data to
6145 * influence the dump
6146 */
6147 if (cb->strict_check) {
6148 err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
6149
6150 if (err < 0)
6151 return err;
6152 }
6153
6154 err = 0;
6155 rcu_read_lock();
6156 for_each_netdev_dump(net, dev, ctx->ifindex) {
6157 idev = __in6_dev_get(dev);
6158 if (!idev)
6159 continue;
6160 err = inet6_fill_ifinfo(skb, idev,
6161 NETLINK_CB(cb->skb).portid,
6162 cb->nlh->nlmsg_seq,
6163 RTM_NEWLINK, NLM_F_MULTI);
6164 if (err < 0)
6165 break;
6166 }
6167 rcu_read_unlock();
6168
6169 return err;
6170 }
6171
6172 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
6173 {
6174 struct sk_buff *skb;
6175 struct net *net = dev_net(idev->dev);
6176 int err = -ENOBUFS;
6177
6178 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
6179 if (!skb)
6180 goto errout;
6181
6182 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
6183 if (err < 0) {
6184 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
6185 WARN_ON(err == -EMSGSIZE);
6186 kfree_skb(skb);
6187 goto errout;
6188 }
6189 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
6190 return;
6191 errout:
6192 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6193 }
6194
6195 static inline size_t inet6_prefix_nlmsg_size(void)
6196 {
6197 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6198 + nla_total_size(sizeof(struct in6_addr))
6199 + nla_total_size(sizeof(struct prefix_cacheinfo));
6200 }
6201
6202 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6203 struct prefix_info *pinfo, u32 portid, u32 seq,
6204 int event, unsigned int flags)
6205 {
6206 struct prefixmsg *pmsg;
6207 struct nlmsghdr *nlh;
6208 struct prefix_cacheinfo ci;
6209
6210 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6211 if (!nlh)
6212 return -EMSGSIZE;
6213
6214 pmsg = nlmsg_data(nlh);
6215 pmsg->prefix_family = AF_INET6;
6216 pmsg->prefix_pad1 = 0;
6217 pmsg->prefix_pad2 = 0;
6218 pmsg->prefix_ifindex = idev->dev->ifindex;
6219 pmsg->prefix_len = pinfo->prefix_len;
6220 pmsg->prefix_type = pinfo->type;
6221 pmsg->prefix_pad3 = 0;
6222 pmsg->prefix_flags = pinfo->flags;
6223
6224 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6225 goto nla_put_failure;
6226 ci.preferred_time = ntohl(pinfo->prefered);
6227 ci.valid_time = ntohl(pinfo->valid);
6228 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6229 goto nla_put_failure;
6230 nlmsg_end(skb, nlh);
6231 return 0;
6232
6233 nla_put_failure:
6234 nlmsg_cancel(skb, nlh);
6235 return -EMSGSIZE;
6236 }
6237
6238 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6239 struct prefix_info *pinfo)
6240 {
6241 struct sk_buff *skb;
6242 struct net *net = dev_net(idev->dev);
6243 int err = -ENOBUFS;
6244
6245 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6246 if (!skb)
6247 goto errout;
6248
6249 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6250 if (err < 0) {
6251 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6252 WARN_ON(err == -EMSGSIZE);
6253 kfree_skb(skb);
6254 goto errout;
6255 }
6256 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6257 return;
6258 errout:
6259 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6260 }
6261
6262 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6263 {
6264 struct net *net = dev_net(ifp->idev->dev);
6265
6266 if (event)
6267 ASSERT_RTNL();
6268
6269 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6270
6271 switch (event) {
6272 case RTM_NEWADDR:
6273 /*
6274 * If the address was optimistic we inserted the route at the
6275 * start of our DAD process, so we don't need to do it again.
6276 * If the device was taken down in the middle of the DAD
6277 * cycle there is a race where we could get here without a
6278 * host route, so nothing to insert. That will be fixed when
6279 * the device is brought up.
6280 */
6281 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6282 ip6_ins_rt(net, ifp->rt);
6283 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6284 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6285 &ifp->addr, ifp->idev->dev->name);
6286 }
6287
6288 if (ifp->idev->cnf.forwarding)
6289 addrconf_join_anycast(ifp);
6290 if (!ipv6_addr_any(&ifp->peer_addr))
6291 addrconf_prefix_route(&ifp->peer_addr, 128,
6292 ifp->rt_priority, ifp->idev->dev,
6293 0, 0, GFP_ATOMIC);
6294 break;
6295 case RTM_DELADDR:
6296 if (ifp->idev->cnf.forwarding)
6297 addrconf_leave_anycast(ifp);
6298 addrconf_leave_solict(ifp->idev, &ifp->addr);
6299 if (!ipv6_addr_any(&ifp->peer_addr)) {
6300 struct fib6_info *rt;
6301
6302 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6303 ifp->idev->dev, 0, 0,
6304 false);
6305 if (rt)
6306 ip6_del_rt(net, rt, false);
6307 }
6308 if (ifp->rt) {
6309 ip6_del_rt(net, ifp->rt, false);
6310 ifp->rt = NULL;
6311 }
6312 rt_genid_bump_ipv6(net);
6313 break;
6314 }
6315 atomic_inc(&net->ipv6.dev_addr_genid);
6316 }
6317
6318 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6319 {
6320 if (likely(ifp->idev->dead == 0))
6321 __ipv6_ifa_notify(event, ifp);
6322 }
6323
6324 #ifdef CONFIG_SYSCTL
6325
6326 static int addrconf_sysctl_forward(const struct ctl_table *ctl, int write,
6327 void *buffer, size_t *lenp, loff_t *ppos)
6328 {
6329 int *valp = ctl->data;
6330 int val = *valp;
6331 loff_t pos = *ppos;
6332 struct ctl_table lctl;
6333 int ret;
6334
6335 /*
6336 * ctl->data points to idev->cnf.forwarding, we should
6337 * not modify it until we get the rtnl lock.
6338 */
6339 lctl = *ctl;
6340 lctl.data = &val;
6341
6342 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6343
6344 if (write)
6345 ret = addrconf_fixup_forwarding(ctl, valp, val);
6346 if (ret)
6347 *ppos = pos;
6348 return ret;
6349 }
6350
6351 static int addrconf_sysctl_mtu(const struct ctl_table *ctl, int write,
6352 void *buffer, size_t *lenp, loff_t *ppos)
6353 {
6354 struct inet6_dev *idev = ctl->extra1;
6355 int min_mtu = IPV6_MIN_MTU;
6356 struct ctl_table lctl;
6357
6358 lctl = *ctl;
6359 lctl.extra1 = &min_mtu;
6360 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6361
6362 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6363 }
6364
6365 static void dev_disable_change(struct inet6_dev *idev)
6366 {
6367 struct netdev_notifier_info info;
6368
6369 if (!idev || !idev->dev)
6370 return;
6371
6372 netdev_notifier_info_init(&info, idev->dev);
6373 if (idev->cnf.disable_ipv6)
6374 addrconf_notify(NULL, NETDEV_DOWN, &info);
6375 else
6376 addrconf_notify(NULL, NETDEV_UP, &info);
6377 }
6378
6379 static void addrconf_disable_change(struct net *net, __s32 newf)
6380 {
6381 struct net_device *dev;
6382 struct inet6_dev *idev;
6383
6384 for_each_netdev(net, dev) {
6385 idev = __in6_dev_get(dev);
6386 if (idev) {
6387 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6388
6389 WRITE_ONCE(idev->cnf.disable_ipv6, newf);
6390 if (changed)
6391 dev_disable_change(idev);
6392 }
6393 }
6394 }
6395
6396 static int addrconf_disable_ipv6(const struct ctl_table *table, int *p, int newf)
6397 {
6398 struct net *net = (struct net *)table->extra2;
6399 int old;
6400
6401 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6402 WRITE_ONCE(*p, newf);
6403 return 0;
6404 }
6405
6406 if (!rtnl_trylock())
6407 return restart_syscall();
6408
6409 old = *p;
6410 WRITE_ONCE(*p, newf);
6411
6412 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6413 WRITE_ONCE(net->ipv6.devconf_dflt->disable_ipv6, newf);
6414 addrconf_disable_change(net, newf);
6415 } else if ((!newf) ^ (!old))
6416 dev_disable_change((struct inet6_dev *)table->extra1);
6417
6418 rtnl_unlock();
6419 return 0;
6420 }
6421
6422 static int addrconf_sysctl_disable(const struct ctl_table *ctl, int write,
6423 void *buffer, size_t *lenp, loff_t *ppos)
6424 {
6425 int *valp = ctl->data;
6426 int val = *valp;
6427 loff_t pos = *ppos;
6428 struct ctl_table lctl;
6429 int ret;
6430
6431 /*
6432 * ctl->data points to idev->cnf.disable_ipv6, we should
6433 * not modify it until we get the rtnl lock.
6434 */
6435 lctl = *ctl;
6436 lctl.data = &val;
6437
6438 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6439
6440 if (write)
6441 ret = addrconf_disable_ipv6(ctl, valp, val);
6442 if (ret)
6443 *ppos = pos;
6444 return ret;
6445 }
6446
6447 static int addrconf_sysctl_proxy_ndp(const struct ctl_table *ctl, int write,
6448 void *buffer, size_t *lenp, loff_t *ppos)
6449 {
6450 int *valp = ctl->data;
6451 int ret;
6452 int old, new;
6453
6454 old = *valp;
6455 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6456 new = *valp;
6457
6458 if (write && old != new) {
6459 struct net *net = ctl->extra2;
6460
6461 if (!rtnl_trylock())
6462 return restart_syscall();
6463
6464 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6465 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6466 NETCONFA_PROXY_NEIGH,
6467 NETCONFA_IFINDEX_DEFAULT,
6468 net->ipv6.devconf_dflt);
6469 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6470 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6471 NETCONFA_PROXY_NEIGH,
6472 NETCONFA_IFINDEX_ALL,
6473 net->ipv6.devconf_all);
6474 else {
6475 struct inet6_dev *idev = ctl->extra1;
6476
6477 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6478 NETCONFA_PROXY_NEIGH,
6479 idev->dev->ifindex,
6480 &idev->cnf);
6481 }
6482 rtnl_unlock();
6483 }
6484
6485 return ret;
6486 }
6487
6488 static int addrconf_sysctl_addr_gen_mode(const struct ctl_table *ctl, int write,
6489 void *buffer, size_t *lenp,
6490 loff_t *ppos)
6491 {
6492 int ret = 0;
6493 u32 new_val;
6494 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6495 struct net *net = (struct net *)ctl->extra2;
6496 struct ctl_table tmp = {
6497 .data = &new_val,
6498 .maxlen = sizeof(new_val),
6499 .mode = ctl->mode,
6500 };
6501
6502 if (!rtnl_trylock())
6503 return restart_syscall();
6504
6505 new_val = *((u32 *)ctl->data);
6506
6507 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6508 if (ret != 0)
6509 goto out;
6510
6511 if (write) {
6512 if (check_addr_gen_mode(new_val) < 0) {
6513 ret = -EINVAL;
6514 goto out;
6515 }
6516
6517 if (idev) {
6518 if (check_stable_privacy(idev, net, new_val) < 0) {
6519 ret = -EINVAL;
6520 goto out;
6521 }
6522
6523 if (idev->cnf.addr_gen_mode != new_val) {
6524 WRITE_ONCE(idev->cnf.addr_gen_mode, new_val);
6525 addrconf_init_auto_addrs(idev->dev);
6526 }
6527 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6528 struct net_device *dev;
6529
6530 WRITE_ONCE(net->ipv6.devconf_dflt->addr_gen_mode, new_val);
6531 for_each_netdev(net, dev) {
6532 idev = __in6_dev_get(dev);
6533 if (idev &&
6534 idev->cnf.addr_gen_mode != new_val) {
6535 WRITE_ONCE(idev->cnf.addr_gen_mode,
6536 new_val);
6537 addrconf_init_auto_addrs(idev->dev);
6538 }
6539 }
6540 }
6541
6542 WRITE_ONCE(*((u32 *)ctl->data), new_val);
6543 }
6544
6545 out:
6546 rtnl_unlock();
6547
6548 return ret;
6549 }
6550
6551 static int addrconf_sysctl_stable_secret(const struct ctl_table *ctl, int write,
6552 void *buffer, size_t *lenp,
6553 loff_t *ppos)
6554 {
6555 int err;
6556 struct in6_addr addr;
6557 char str[IPV6_MAX_STRLEN];
6558 struct ctl_table lctl = *ctl;
6559 struct net *net = ctl->extra2;
6560 struct ipv6_stable_secret *secret = ctl->data;
6561
6562 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6563 return -EIO;
6564
6565 lctl.maxlen = IPV6_MAX_STRLEN;
6566 lctl.data = str;
6567
6568 if (!rtnl_trylock())
6569 return restart_syscall();
6570
6571 if (!write && !secret->initialized) {
6572 err = -EIO;
6573 goto out;
6574 }
6575
6576 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6577 if (err >= sizeof(str)) {
6578 err = -EIO;
6579 goto out;
6580 }
6581
6582 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6583 if (err || !write)
6584 goto out;
6585
6586 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6587 err = -EIO;
6588 goto out;
6589 }
6590
6591 secret->initialized = true;
6592 secret->secret = addr;
6593
6594 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6595 struct net_device *dev;
6596
6597 for_each_netdev(net, dev) {
6598 struct inet6_dev *idev = __in6_dev_get(dev);
6599
6600 if (idev) {
6601 WRITE_ONCE(idev->cnf.addr_gen_mode,
6602 IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6603 }
6604 }
6605 } else {
6606 struct inet6_dev *idev = ctl->extra1;
6607
6608 WRITE_ONCE(idev->cnf.addr_gen_mode,
6609 IN6_ADDR_GEN_MODE_STABLE_PRIVACY);
6610 }
6611
6612 out:
6613 rtnl_unlock();
6614
6615 return err;
6616 }
6617
6618 static
6619 int addrconf_sysctl_ignore_routes_with_linkdown(const struct ctl_table *ctl,
6620 int write, void *buffer,
6621 size_t *lenp,
6622 loff_t *ppos)
6623 {
6624 int *valp = ctl->data;
6625 int val = *valp;
6626 loff_t pos = *ppos;
6627 struct ctl_table lctl;
6628 int ret;
6629
6630 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6631 * we should not modify it until we get the rtnl lock.
6632 */
6633 lctl = *ctl;
6634 lctl.data = &val;
6635
6636 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6637
6638 if (write)
6639 ret = addrconf_fixup_linkdown(ctl, valp, val);
6640 if (ret)
6641 *ppos = pos;
6642 return ret;
6643 }
6644
6645 static
6646 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6647 {
6648 if (rt) {
6649 if (action)
6650 rt->dst.flags |= DST_NOPOLICY;
6651 else
6652 rt->dst.flags &= ~DST_NOPOLICY;
6653 }
6654 }
6655
6656 static
6657 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6658 {
6659 struct inet6_ifaddr *ifa;
6660
6661 read_lock_bh(&idev->lock);
6662 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6663 spin_lock(&ifa->lock);
6664 if (ifa->rt) {
6665 /* host routes only use builtin fib6_nh */
6666 struct fib6_nh *nh = ifa->rt->fib6_nh;
6667 int cpu;
6668
6669 rcu_read_lock();
6670 ifa->rt->dst_nopolicy = val ? true : false;
6671 if (nh->rt6i_pcpu) {
6672 for_each_possible_cpu(cpu) {
6673 struct rt6_info **rtp;
6674
6675 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6676 addrconf_set_nopolicy(*rtp, val);
6677 }
6678 }
6679 rcu_read_unlock();
6680 }
6681 spin_unlock(&ifa->lock);
6682 }
6683 read_unlock_bh(&idev->lock);
6684 }
6685
6686 static
6687 int addrconf_disable_policy(const struct ctl_table *ctl, int *valp, int val)
6688 {
6689 struct net *net = (struct net *)ctl->extra2;
6690 struct inet6_dev *idev;
6691
6692 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6693 WRITE_ONCE(*valp, val);
6694 return 0;
6695 }
6696
6697 if (!rtnl_trylock())
6698 return restart_syscall();
6699
6700 WRITE_ONCE(*valp, val);
6701
6702 if (valp == &net->ipv6.devconf_all->disable_policy) {
6703 struct net_device *dev;
6704
6705 for_each_netdev(net, dev) {
6706 idev = __in6_dev_get(dev);
6707 if (idev)
6708 addrconf_disable_policy_idev(idev, val);
6709 }
6710 } else {
6711 idev = (struct inet6_dev *)ctl->extra1;
6712 addrconf_disable_policy_idev(idev, val);
6713 }
6714
6715 rtnl_unlock();
6716 return 0;
6717 }
6718
6719 static int addrconf_sysctl_disable_policy(const struct ctl_table *ctl, int write,
6720 void *buffer, size_t *lenp, loff_t *ppos)
6721 {
6722 int *valp = ctl->data;
6723 int val = *valp;
6724 loff_t pos = *ppos;
6725 struct ctl_table lctl;
6726 int ret;
6727
6728 lctl = *ctl;
6729 lctl.data = &val;
6730 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6731
6732 if (write && (*valp != val))
6733 ret = addrconf_disable_policy(ctl, valp, val);
6734
6735 if (ret)
6736 *ppos = pos;
6737
6738 return ret;
6739 }
6740
6741 static int minus_one = -1;
6742 static const int two_five_five = 255;
6743 static u32 ioam6_if_id_max = U16_MAX;
6744
6745 static const struct ctl_table addrconf_sysctl[] = {
6746 {
6747 .procname = "forwarding",
6748 .data = &ipv6_devconf.forwarding,
6749 .maxlen = sizeof(int),
6750 .mode = 0644,
6751 .proc_handler = addrconf_sysctl_forward,
6752 },
6753 {
6754 .procname = "hop_limit",
6755 .data = &ipv6_devconf.hop_limit,
6756 .maxlen = sizeof(int),
6757 .mode = 0644,
6758 .proc_handler = proc_dointvec_minmax,
6759 .extra1 = (void *)SYSCTL_ONE,
6760 .extra2 = (void *)&two_five_five,
6761 },
6762 {
6763 .procname = "mtu",
6764 .data = &ipv6_devconf.mtu6,
6765 .maxlen = sizeof(int),
6766 .mode = 0644,
6767 .proc_handler = addrconf_sysctl_mtu,
6768 },
6769 {
6770 .procname = "accept_ra",
6771 .data = &ipv6_devconf.accept_ra,
6772 .maxlen = sizeof(int),
6773 .mode = 0644,
6774 .proc_handler = proc_dointvec,
6775 },
6776 {
6777 .procname = "accept_redirects",
6778 .data = &ipv6_devconf.accept_redirects,
6779 .maxlen = sizeof(int),
6780 .mode = 0644,
6781 .proc_handler = proc_dointvec,
6782 },
6783 {
6784 .procname = "autoconf",
6785 .data = &ipv6_devconf.autoconf,
6786 .maxlen = sizeof(int),
6787 .mode = 0644,
6788 .proc_handler = proc_dointvec,
6789 },
6790 {
6791 .procname = "dad_transmits",
6792 .data = &ipv6_devconf.dad_transmits,
6793 .maxlen = sizeof(int),
6794 .mode = 0644,
6795 .proc_handler = proc_dointvec,
6796 },
6797 {
6798 .procname = "router_solicitations",
6799 .data = &ipv6_devconf.rtr_solicits,
6800 .maxlen = sizeof(int),
6801 .mode = 0644,
6802 .proc_handler = proc_dointvec_minmax,
6803 .extra1 = &minus_one,
6804 },
6805 {
6806 .procname = "router_solicitation_interval",
6807 .data = &ipv6_devconf.rtr_solicit_interval,
6808 .maxlen = sizeof(int),
6809 .mode = 0644,
6810 .proc_handler = proc_dointvec_jiffies,
6811 },
6812 {
6813 .procname = "router_solicitation_max_interval",
6814 .data = &ipv6_devconf.rtr_solicit_max_interval,
6815 .maxlen = sizeof(int),
6816 .mode = 0644,
6817 .proc_handler = proc_dointvec_jiffies,
6818 },
6819 {
6820 .procname = "router_solicitation_delay",
6821 .data = &ipv6_devconf.rtr_solicit_delay,
6822 .maxlen = sizeof(int),
6823 .mode = 0644,
6824 .proc_handler = proc_dointvec_jiffies,
6825 },
6826 {
6827 .procname = "force_mld_version",
6828 .data = &ipv6_devconf.force_mld_version,
6829 .maxlen = sizeof(int),
6830 .mode = 0644,
6831 .proc_handler = proc_dointvec,
6832 },
6833 {
6834 .procname = "mldv1_unsolicited_report_interval",
6835 .data =
6836 &ipv6_devconf.mldv1_unsolicited_report_interval,
6837 .maxlen = sizeof(int),
6838 .mode = 0644,
6839 .proc_handler = proc_dointvec_ms_jiffies,
6840 },
6841 {
6842 .procname = "mldv2_unsolicited_report_interval",
6843 .data =
6844 &ipv6_devconf.mldv2_unsolicited_report_interval,
6845 .maxlen = sizeof(int),
6846 .mode = 0644,
6847 .proc_handler = proc_dointvec_ms_jiffies,
6848 },
6849 {
6850 .procname = "use_tempaddr",
6851 .data = &ipv6_devconf.use_tempaddr,
6852 .maxlen = sizeof(int),
6853 .mode = 0644,
6854 .proc_handler = proc_dointvec,
6855 },
6856 {
6857 .procname = "temp_valid_lft",
6858 .data = &ipv6_devconf.temp_valid_lft,
6859 .maxlen = sizeof(int),
6860 .mode = 0644,
6861 .proc_handler = proc_dointvec,
6862 },
6863 {
6864 .procname = "temp_prefered_lft",
6865 .data = &ipv6_devconf.temp_prefered_lft,
6866 .maxlen = sizeof(int),
6867 .mode = 0644,
6868 .proc_handler = proc_dointvec,
6869 },
6870 {
6871 .procname = "regen_min_advance",
6872 .data = &ipv6_devconf.regen_min_advance,
6873 .maxlen = sizeof(int),
6874 .mode = 0644,
6875 .proc_handler = proc_dointvec,
6876 },
6877 {
6878 .procname = "regen_max_retry",
6879 .data = &ipv6_devconf.regen_max_retry,
6880 .maxlen = sizeof(int),
6881 .mode = 0644,
6882 .proc_handler = proc_dointvec,
6883 },
6884 {
6885 .procname = "max_desync_factor",
6886 .data = &ipv6_devconf.max_desync_factor,
6887 .maxlen = sizeof(int),
6888 .mode = 0644,
6889 .proc_handler = proc_dointvec,
6890 },
6891 {
6892 .procname = "max_addresses",
6893 .data = &ipv6_devconf.max_addresses,
6894 .maxlen = sizeof(int),
6895 .mode = 0644,
6896 .proc_handler = proc_dointvec,
6897 },
6898 {
6899 .procname = "accept_ra_defrtr",
6900 .data = &ipv6_devconf.accept_ra_defrtr,
6901 .maxlen = sizeof(int),
6902 .mode = 0644,
6903 .proc_handler = proc_dointvec,
6904 },
6905 {
6906 .procname = "ra_defrtr_metric",
6907 .data = &ipv6_devconf.ra_defrtr_metric,
6908 .maxlen = sizeof(u32),
6909 .mode = 0644,
6910 .proc_handler = proc_douintvec_minmax,
6911 .extra1 = (void *)SYSCTL_ONE,
6912 },
6913 {
6914 .procname = "accept_ra_min_hop_limit",
6915 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6916 .maxlen = sizeof(int),
6917 .mode = 0644,
6918 .proc_handler = proc_dointvec,
6919 },
6920 {
6921 .procname = "accept_ra_min_lft",
6922 .data = &ipv6_devconf.accept_ra_min_lft,
6923 .maxlen = sizeof(int),
6924 .mode = 0644,
6925 .proc_handler = proc_dointvec,
6926 },
6927 {
6928 .procname = "accept_ra_pinfo",
6929 .data = &ipv6_devconf.accept_ra_pinfo,
6930 .maxlen = sizeof(int),
6931 .mode = 0644,
6932 .proc_handler = proc_dointvec,
6933 },
6934 {
6935 .procname = "ra_honor_pio_life",
6936 .data = &ipv6_devconf.ra_honor_pio_life,
6937 .maxlen = sizeof(u8),
6938 .mode = 0644,
6939 .proc_handler = proc_dou8vec_minmax,
6940 .extra1 = SYSCTL_ZERO,
6941 .extra2 = SYSCTL_ONE,
6942 },
6943 {
6944 .procname = "ra_honor_pio_pflag",
6945 .data = &ipv6_devconf.ra_honor_pio_pflag,
6946 .maxlen = sizeof(u8),
6947 .mode = 0644,
6948 .proc_handler = proc_dou8vec_minmax,
6949 .extra1 = SYSCTL_ZERO,
6950 .extra2 = SYSCTL_ONE,
6951 },
6952 #ifdef CONFIG_IPV6_ROUTER_PREF
6953 {
6954 .procname = "accept_ra_rtr_pref",
6955 .data = &ipv6_devconf.accept_ra_rtr_pref,
6956 .maxlen = sizeof(int),
6957 .mode = 0644,
6958 .proc_handler = proc_dointvec,
6959 },
6960 {
6961 .procname = "router_probe_interval",
6962 .data = &ipv6_devconf.rtr_probe_interval,
6963 .maxlen = sizeof(int),
6964 .mode = 0644,
6965 .proc_handler = proc_dointvec_jiffies,
6966 },
6967 #ifdef CONFIG_IPV6_ROUTE_INFO
6968 {
6969 .procname = "accept_ra_rt_info_min_plen",
6970 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6971 .maxlen = sizeof(int),
6972 .mode = 0644,
6973 .proc_handler = proc_dointvec,
6974 },
6975 {
6976 .procname = "accept_ra_rt_info_max_plen",
6977 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6978 .maxlen = sizeof(int),
6979 .mode = 0644,
6980 .proc_handler = proc_dointvec,
6981 },
6982 #endif
6983 #endif
6984 {
6985 .procname = "proxy_ndp",
6986 .data = &ipv6_devconf.proxy_ndp,
6987 .maxlen = sizeof(int),
6988 .mode = 0644,
6989 .proc_handler = addrconf_sysctl_proxy_ndp,
6990 },
6991 {
6992 .procname = "accept_source_route",
6993 .data = &ipv6_devconf.accept_source_route,
6994 .maxlen = sizeof(int),
6995 .mode = 0644,
6996 .proc_handler = proc_dointvec,
6997 },
6998 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6999 {
7000 .procname = "optimistic_dad",
7001 .data = &ipv6_devconf.optimistic_dad,
7002 .maxlen = sizeof(int),
7003 .mode = 0644,
7004 .proc_handler = proc_dointvec,
7005 },
7006 {
7007 .procname = "use_optimistic",
7008 .data = &ipv6_devconf.use_optimistic,
7009 .maxlen = sizeof(int),
7010 .mode = 0644,
7011 .proc_handler = proc_dointvec,
7012 },
7013 #endif
7014 #ifdef CONFIG_IPV6_MROUTE
7015 {
7016 .procname = "mc_forwarding",
7017 .data = &ipv6_devconf.mc_forwarding,
7018 .maxlen = sizeof(int),
7019 .mode = 0444,
7020 .proc_handler = proc_dointvec,
7021 },
7022 #endif
7023 {
7024 .procname = "disable_ipv6",
7025 .data = &ipv6_devconf.disable_ipv6,
7026 .maxlen = sizeof(int),
7027 .mode = 0644,
7028 .proc_handler = addrconf_sysctl_disable,
7029 },
7030 {
7031 .procname = "accept_dad",
7032 .data = &ipv6_devconf.accept_dad,
7033 .maxlen = sizeof(int),
7034 .mode = 0644,
7035 .proc_handler = proc_dointvec,
7036 },
7037 {
7038 .procname = "force_tllao",
7039 .data = &ipv6_devconf.force_tllao,
7040 .maxlen = sizeof(int),
7041 .mode = 0644,
7042 .proc_handler = proc_dointvec
7043 },
7044 {
7045 .procname = "ndisc_notify",
7046 .data = &ipv6_devconf.ndisc_notify,
7047 .maxlen = sizeof(int),
7048 .mode = 0644,
7049 .proc_handler = proc_dointvec
7050 },
7051 {
7052 .procname = "suppress_frag_ndisc",
7053 .data = &ipv6_devconf.suppress_frag_ndisc,
7054 .maxlen = sizeof(int),
7055 .mode = 0644,
7056 .proc_handler = proc_dointvec
7057 },
7058 {
7059 .procname = "accept_ra_from_local",
7060 .data = &ipv6_devconf.accept_ra_from_local,
7061 .maxlen = sizeof(int),
7062 .mode = 0644,
7063 .proc_handler = proc_dointvec,
7064 },
7065 {
7066 .procname = "accept_ra_mtu",
7067 .data = &ipv6_devconf.accept_ra_mtu,
7068 .maxlen = sizeof(int),
7069 .mode = 0644,
7070 .proc_handler = proc_dointvec,
7071 },
7072 {
7073 .procname = "stable_secret",
7074 .data = &ipv6_devconf.stable_secret,
7075 .maxlen = IPV6_MAX_STRLEN,
7076 .mode = 0600,
7077 .proc_handler = addrconf_sysctl_stable_secret,
7078 },
7079 {
7080 .procname = "use_oif_addrs_only",
7081 .data = &ipv6_devconf.use_oif_addrs_only,
7082 .maxlen = sizeof(int),
7083 .mode = 0644,
7084 .proc_handler = proc_dointvec,
7085 },
7086 {
7087 .procname = "ignore_routes_with_linkdown",
7088 .data = &ipv6_devconf.ignore_routes_with_linkdown,
7089 .maxlen = sizeof(int),
7090 .mode = 0644,
7091 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
7092 },
7093 {
7094 .procname = "drop_unicast_in_l2_multicast",
7095 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
7096 .maxlen = sizeof(int),
7097 .mode = 0644,
7098 .proc_handler = proc_dointvec,
7099 },
7100 {
7101 .procname = "drop_unsolicited_na",
7102 .data = &ipv6_devconf.drop_unsolicited_na,
7103 .maxlen = sizeof(int),
7104 .mode = 0644,
7105 .proc_handler = proc_dointvec,
7106 },
7107 {
7108 .procname = "keep_addr_on_down",
7109 .data = &ipv6_devconf.keep_addr_on_down,
7110 .maxlen = sizeof(int),
7111 .mode = 0644,
7112 .proc_handler = proc_dointvec,
7113
7114 },
7115 {
7116 .procname = "seg6_enabled",
7117 .data = &ipv6_devconf.seg6_enabled,
7118 .maxlen = sizeof(int),
7119 .mode = 0644,
7120 .proc_handler = proc_dointvec,
7121 },
7122 #ifdef CONFIG_IPV6_SEG6_HMAC
7123 {
7124 .procname = "seg6_require_hmac",
7125 .data = &ipv6_devconf.seg6_require_hmac,
7126 .maxlen = sizeof(int),
7127 .mode = 0644,
7128 .proc_handler = proc_dointvec,
7129 },
7130 #endif
7131 {
7132 .procname = "enhanced_dad",
7133 .data = &ipv6_devconf.enhanced_dad,
7134 .maxlen = sizeof(int),
7135 .mode = 0644,
7136 .proc_handler = proc_dointvec,
7137 },
7138 {
7139 .procname = "addr_gen_mode",
7140 .data = &ipv6_devconf.addr_gen_mode,
7141 .maxlen = sizeof(int),
7142 .mode = 0644,
7143 .proc_handler = addrconf_sysctl_addr_gen_mode,
7144 },
7145 {
7146 .procname = "disable_policy",
7147 .data = &ipv6_devconf.disable_policy,
7148 .maxlen = sizeof(int),
7149 .mode = 0644,
7150 .proc_handler = addrconf_sysctl_disable_policy,
7151 },
7152 {
7153 .procname = "ndisc_tclass",
7154 .data = &ipv6_devconf.ndisc_tclass,
7155 .maxlen = sizeof(int),
7156 .mode = 0644,
7157 .proc_handler = proc_dointvec_minmax,
7158 .extra1 = (void *)SYSCTL_ZERO,
7159 .extra2 = (void *)&two_five_five,
7160 },
7161 {
7162 .procname = "rpl_seg_enabled",
7163 .data = &ipv6_devconf.rpl_seg_enabled,
7164 .maxlen = sizeof(int),
7165 .mode = 0644,
7166 .proc_handler = proc_dointvec,
7167 },
7168 {
7169 .procname = "ioam6_enabled",
7170 .data = &ipv6_devconf.ioam6_enabled,
7171 .maxlen = sizeof(u8),
7172 .mode = 0644,
7173 .proc_handler = proc_dou8vec_minmax,
7174 .extra1 = (void *)SYSCTL_ZERO,
7175 .extra2 = (void *)SYSCTL_ONE,
7176 },
7177 {
7178 .procname = "ioam6_id",
7179 .data = &ipv6_devconf.ioam6_id,
7180 .maxlen = sizeof(u32),
7181 .mode = 0644,
7182 .proc_handler = proc_douintvec_minmax,
7183 .extra1 = (void *)SYSCTL_ZERO,
7184 .extra2 = (void *)&ioam6_if_id_max,
7185 },
7186 {
7187 .procname = "ioam6_id_wide",
7188 .data = &ipv6_devconf.ioam6_id_wide,
7189 .maxlen = sizeof(u32),
7190 .mode = 0644,
7191 .proc_handler = proc_douintvec,
7192 },
7193 {
7194 .procname = "ndisc_evict_nocarrier",
7195 .data = &ipv6_devconf.ndisc_evict_nocarrier,
7196 .maxlen = sizeof(u8),
7197 .mode = 0644,
7198 .proc_handler = proc_dou8vec_minmax,
7199 .extra1 = (void *)SYSCTL_ZERO,
7200 .extra2 = (void *)SYSCTL_ONE,
7201 },
7202 {
7203 .procname = "accept_untracked_na",
7204 .data = &ipv6_devconf.accept_untracked_na,
7205 .maxlen = sizeof(int),
7206 .mode = 0644,
7207 .proc_handler = proc_dointvec_minmax,
7208 .extra1 = SYSCTL_ZERO,
7209 .extra2 = SYSCTL_TWO,
7210 },
7211 };
7212
7213 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
7214 struct inet6_dev *idev, struct ipv6_devconf *p)
7215 {
7216 size_t table_size = ARRAY_SIZE(addrconf_sysctl);
7217 int i, ifindex;
7218 struct ctl_table *table;
7219 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
7220
7221 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL_ACCOUNT);
7222 if (!table)
7223 goto out;
7224
7225 for (i = 0; i < table_size; i++) {
7226 table[i].data += (char *)p - (char *)&ipv6_devconf;
7227 /* If one of these is already set, then it is not safe to
7228 * overwrite either of them: this makes proc_dointvec_minmax
7229 * usable.
7230 */
7231 if (!table[i].extra1 && !table[i].extra2) {
7232 table[i].extra1 = idev; /* embedded; no ref */
7233 table[i].extra2 = net;
7234 }
7235 }
7236
7237 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
7238
7239 p->sysctl_header = register_net_sysctl_sz(net, path, table,
7240 table_size);
7241 if (!p->sysctl_header)
7242 goto free;
7243
7244 if (!strcmp(dev_name, "all"))
7245 ifindex = NETCONFA_IFINDEX_ALL;
7246 else if (!strcmp(dev_name, "default"))
7247 ifindex = NETCONFA_IFINDEX_DEFAULT;
7248 else
7249 ifindex = idev->dev->ifindex;
7250 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
7251 ifindex, p);
7252 return 0;
7253
7254 free:
7255 kfree(table);
7256 out:
7257 return -ENOBUFS;
7258 }
7259
7260 static void __addrconf_sysctl_unregister(struct net *net,
7261 struct ipv6_devconf *p, int ifindex)
7262 {
7263 const struct ctl_table *table;
7264
7265 if (!p->sysctl_header)
7266 return;
7267
7268 table = p->sysctl_header->ctl_table_arg;
7269 unregister_net_sysctl_table(p->sysctl_header);
7270 p->sysctl_header = NULL;
7271 kfree(table);
7272
7273 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7274 }
7275
7276 static int addrconf_sysctl_register(struct inet6_dev *idev)
7277 {
7278 int err;
7279
7280 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7281 return -EINVAL;
7282
7283 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7284 &ndisc_ifinfo_sysctl_change);
7285 if (err)
7286 return err;
7287 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7288 idev, &idev->cnf);
7289 if (err)
7290 neigh_sysctl_unregister(idev->nd_parms);
7291
7292 return err;
7293 }
7294
7295 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7296 {
7297 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7298 idev->dev->ifindex);
7299 neigh_sysctl_unregister(idev->nd_parms);
7300 }
7301
7302
7303 #endif
7304
7305 static int __net_init addrconf_init_net(struct net *net)
7306 {
7307 int err = -ENOMEM;
7308 struct ipv6_devconf *all, *dflt;
7309
7310 spin_lock_init(&net->ipv6.addrconf_hash_lock);
7311 INIT_DEFERRABLE_WORK(&net->ipv6.addr_chk_work, addrconf_verify_work);
7312 net->ipv6.inet6_addr_lst = kcalloc(IN6_ADDR_HSIZE,
7313 sizeof(struct hlist_head),
7314 GFP_KERNEL);
7315 if (!net->ipv6.inet6_addr_lst)
7316 goto err_alloc_addr;
7317
7318 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7319 if (!all)
7320 goto err_alloc_all;
7321
7322 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7323 if (!dflt)
7324 goto err_alloc_dflt;
7325
7326 if (!net_eq(net, &init_net)) {
7327 switch (net_inherit_devconf()) {
7328 case 1: /* copy from init_net */
7329 memcpy(all, init_net.ipv6.devconf_all,
7330 sizeof(ipv6_devconf));
7331 memcpy(dflt, init_net.ipv6.devconf_dflt,
7332 sizeof(ipv6_devconf_dflt));
7333 break;
7334 case 3: /* copy from the current netns */
7335 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7336 sizeof(ipv6_devconf));
7337 memcpy(dflt,
7338 current->nsproxy->net_ns->ipv6.devconf_dflt,
7339 sizeof(ipv6_devconf_dflt));
7340 break;
7341 case 0:
7342 case 2:
7343 /* use compiled values */
7344 break;
7345 }
7346 }
7347
7348 /* these will be inherited by all namespaces */
7349 dflt->autoconf = ipv6_defaults.autoconf;
7350 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7351
7352 dflt->stable_secret.initialized = false;
7353 all->stable_secret.initialized = false;
7354
7355 net->ipv6.devconf_all = all;
7356 net->ipv6.devconf_dflt = dflt;
7357
7358 #ifdef CONFIG_SYSCTL
7359 err = __addrconf_sysctl_register(net, "all", NULL, all);
7360 if (err < 0)
7361 goto err_reg_all;
7362
7363 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7364 if (err < 0)
7365 goto err_reg_dflt;
7366 #endif
7367 return 0;
7368
7369 #ifdef CONFIG_SYSCTL
7370 err_reg_dflt:
7371 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7372 err_reg_all:
7373 kfree(dflt);
7374 net->ipv6.devconf_dflt = NULL;
7375 #endif
7376 err_alloc_dflt:
7377 kfree(all);
7378 net->ipv6.devconf_all = NULL;
7379 err_alloc_all:
7380 kfree(net->ipv6.inet6_addr_lst);
7381 err_alloc_addr:
7382 return err;
7383 }
7384
7385 static void __net_exit addrconf_exit_net(struct net *net)
7386 {
7387 int i;
7388
7389 #ifdef CONFIG_SYSCTL
7390 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7391 NETCONFA_IFINDEX_DEFAULT);
7392 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7393 NETCONFA_IFINDEX_ALL);
7394 #endif
7395 kfree(net->ipv6.devconf_dflt);
7396 net->ipv6.devconf_dflt = NULL;
7397 kfree(net->ipv6.devconf_all);
7398 net->ipv6.devconf_all = NULL;
7399
7400 cancel_delayed_work_sync(&net->ipv6.addr_chk_work);
7401 /*
7402 * Check hash table, then free it.
7403 */
7404 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7405 WARN_ON_ONCE(!hlist_empty(&net->ipv6.inet6_addr_lst[i]));
7406
7407 kfree(net->ipv6.inet6_addr_lst);
7408 net->ipv6.inet6_addr_lst = NULL;
7409 }
7410
7411 static struct pernet_operations addrconf_ops = {
7412 .init = addrconf_init_net,
7413 .exit = addrconf_exit_net,
7414 };
7415
7416 static struct rtnl_af_ops inet6_ops __read_mostly = {
7417 .family = AF_INET6,
7418 .fill_link_af = inet6_fill_link_af,
7419 .get_link_af_size = inet6_get_link_af_size,
7420 .validate_link_af = inet6_validate_link_af,
7421 .set_link_af = inet6_set_link_af,
7422 };
7423
7424 static const struct rtnl_msg_handler addrconf_rtnl_msg_handlers[] __initconst_or_module = {
7425 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETLINK,
7426 .dumpit = inet6_dump_ifinfo, .flags = RTNL_FLAG_DUMP_UNLOCKED},
7427 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_NEWADDR,
7428 .doit = inet6_rtm_newaddr},
7429 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_DELADDR,
7430 .doit = inet6_rtm_deladdr},
7431 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETADDR,
7432 .doit = inet6_rtm_getaddr, .dumpit = inet6_dump_ifaddr,
7433 .flags = RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED},
7434 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETMULTICAST,
7435 .dumpit = inet6_dump_ifmcaddr,
7436 .flags = RTNL_FLAG_DUMP_UNLOCKED},
7437 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETANYCAST,
7438 .dumpit = inet6_dump_ifacaddr,
7439 .flags = RTNL_FLAG_DUMP_UNLOCKED},
7440 {.owner = THIS_MODULE, .protocol = PF_INET6, .msgtype = RTM_GETNETCONF,
7441 .doit = inet6_netconf_get_devconf, .dumpit = inet6_netconf_dump_devconf,
7442 .flags = RTNL_FLAG_DOIT_UNLOCKED | RTNL_FLAG_DUMP_UNLOCKED},
7443 };
7444
7445 /*
7446 * Init / cleanup code
7447 */
7448
7449 int __init addrconf_init(void)
7450 {
7451 struct inet6_dev *idev;
7452 int err;
7453
7454 err = ipv6_addr_label_init();
7455 if (err < 0) {
7456 pr_crit("%s: cannot initialize default policy table: %d\n",
7457 __func__, err);
7458 goto out;
7459 }
7460
7461 err = register_pernet_subsys(&addrconf_ops);
7462 if (err < 0)
7463 goto out_addrlabel;
7464
7465 /* All works using addrconf_wq need to lock rtnl. */
7466 addrconf_wq = create_singlethread_workqueue("ipv6_addrconf");
7467 if (!addrconf_wq) {
7468 err = -ENOMEM;
7469 goto out_nowq;
7470 }
7471
7472 rtnl_lock();
7473 idev = ipv6_add_dev(blackhole_netdev);
7474 rtnl_unlock();
7475 if (IS_ERR(idev)) {
7476 err = PTR_ERR(idev);
7477 goto errlo;
7478 }
7479
7480 ip6_route_init_special_entries();
7481
7482 register_netdevice_notifier(&ipv6_dev_notf);
7483
7484 addrconf_verify(&init_net);
7485
7486 err = rtnl_af_register(&inet6_ops);
7487 if (err)
7488 goto erraf;
7489
7490 err = rtnl_register_many(addrconf_rtnl_msg_handlers);
7491 if (err)
7492 goto errout;
7493
7494 err = ipv6_addr_label_rtnl_register();
7495 if (err < 0)
7496 goto errout;
7497
7498 return 0;
7499 errout:
7500 rtnl_unregister_all(PF_INET6);
7501 rtnl_af_unregister(&inet6_ops);
7502 erraf:
7503 unregister_netdevice_notifier(&ipv6_dev_notf);
7504 errlo:
7505 destroy_workqueue(addrconf_wq);
7506 out_nowq:
7507 unregister_pernet_subsys(&addrconf_ops);
7508 out_addrlabel:
7509 ipv6_addr_label_cleanup();
7510 out:
7511 return err;
7512 }
7513
7514 void addrconf_cleanup(void)
7515 {
7516 struct net_device *dev;
7517
7518 unregister_netdevice_notifier(&ipv6_dev_notf);
7519 unregister_pernet_subsys(&addrconf_ops);
7520 ipv6_addr_label_cleanup();
7521
7522 rtnl_af_unregister(&inet6_ops);
7523
7524 rtnl_lock();
7525
7526 /* clean dev list */
7527 for_each_netdev(&init_net, dev) {
7528 if (__in6_dev_get(dev) == NULL)
7529 continue;
7530 addrconf_ifdown(dev, true);
7531 }
7532 addrconf_ifdown(init_net.loopback_dev, true);
7533
7534 rtnl_unlock();
7535
7536 destroy_workqueue(addrconf_wq);
7537 }
Linux Kernel