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/net_namespace.h>
67 #include <net/sock.h>
68 #include <net/snmp.h>
69
70 #include <net/6lowpan.h>
71 #include <net/firewire.h>
72 #include <net/ipv6.h>
73 #include <net/protocol.h>
74 #include <net/ndisc.h>
75 #include <net/ip6_route.h>
76 #include <net/addrconf.h>
77 #include <net/tcp.h>
78 #include <net/ip.h>
79 #include <net/netlink.h>
80 #include <net/pkt_sched.h>
81 #include <net/l3mdev.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
85 #include <linux/random.h>
86 #include <linux/uaccess.h>
87 #include <asm/unaligned.h>
88
89 #include <linux/proc_fs.h>
90 #include <linux/seq_file.h>
91 #include <linux/export.h>
92
93 #define INFINITY_LIFE_TIME 0xFFFFFFFF
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 = (900000 + prandom_u32() % 200001) * (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 = (1900000 + prandom_u32() % 200001) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = (900000 + prandom_u32() % 200001) * (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 * Configured unicast address hash table
150 */
151 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
152 static DEFINE_SPINLOCK(addrconf_hash_lock);
153
154 static void addrconf_verify(void);
155 static void addrconf_verify_rtnl(void);
156 static void addrconf_verify_work(struct work_struct *);
157
158 static struct workqueue_struct *addrconf_wq;
159 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
160
161 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
162 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
163
164 static void addrconf_type_change(struct net_device *dev,
165 unsigned long event);
166 static int addrconf_ifdown(struct net_device *dev, bool unregister);
167
168 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
169 int plen,
170 const struct net_device *dev,
171 u32 flags, u32 noflags,
172 bool no_gw);
173
174 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
175 static void addrconf_dad_work(struct work_struct *w);
176 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
177 bool send_na);
178 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
179 static void addrconf_rs_timer(struct timer_list *t);
180 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
181 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182
183 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
184 struct prefix_info *pinfo);
185
186 static struct ipv6_devconf ipv6_devconf __read_mostly = {
187 .forwarding = 0,
188 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
189 .mtu6 = IPV6_MIN_MTU,
190 .accept_ra = 1,
191 .accept_redirects = 1,
192 .autoconf = 1,
193 .force_mld_version = 0,
194 .mldv1_unsolicited_report_interval = 10 * HZ,
195 .mldv2_unsolicited_report_interval = HZ,
196 .dad_transmits = 1,
197 .rtr_solicits = MAX_RTR_SOLICITATIONS,
198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
199 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201 .use_tempaddr = 0,
202 .temp_valid_lft = TEMP_VALID_LIFETIME,
203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
204 .regen_max_retry = REGEN_MAX_RETRY,
205 .max_desync_factor = MAX_DESYNC_FACTOR,
206 .max_addresses = IPV6_MAX_ADDRESSES,
207 .accept_ra_defrtr = 1,
208 .ra_defrtr_metric = IP6_RT_PRIO_USER,
209 .accept_ra_from_local = 0,
210 .accept_ra_min_hop_limit= 1,
211 .accept_ra_pinfo = 1,
212 #ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
214 .rtr_probe_interval = 60 * HZ,
215 #ifdef CONFIG_IPV6_ROUTE_INFO
216 .accept_ra_rt_info_min_plen = 0,
217 .accept_ra_rt_info_max_plen = 0,
218 #endif
219 #endif
220 .proxy_ndp = 0,
221 .accept_source_route = 0, /* we do not accept RH0 by default. */
222 .disable_ipv6 = 0,
223 .accept_dad = 0,
224 .suppress_frag_ndisc = 1,
225 .accept_ra_mtu = 1,
226 .stable_secret = {
227 .initialized = false,
228 },
229 .use_oif_addrs_only = 0,
230 .ignore_routes_with_linkdown = 0,
231 .keep_addr_on_down = 0,
232 .seg6_enabled = 0,
233 #ifdef CONFIG_IPV6_SEG6_HMAC
234 .seg6_require_hmac = 0,
235 #endif
236 .enhanced_dad = 1,
237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
238 .disable_policy = 0,
239 .rpl_seg_enabled = 0,
240 };
241
242 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
243 .forwarding = 0,
244 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
245 .mtu6 = IPV6_MIN_MTU,
246 .accept_ra = 1,
247 .accept_redirects = 1,
248 .autoconf = 1,
249 .force_mld_version = 0,
250 .mldv1_unsolicited_report_interval = 10 * HZ,
251 .mldv2_unsolicited_report_interval = HZ,
252 .dad_transmits = 1,
253 .rtr_solicits = MAX_RTR_SOLICITATIONS,
254 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
255 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
256 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
257 .use_tempaddr = 0,
258 .temp_valid_lft = TEMP_VALID_LIFETIME,
259 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
260 .regen_max_retry = REGEN_MAX_RETRY,
261 .max_desync_factor = MAX_DESYNC_FACTOR,
262 .max_addresses = IPV6_MAX_ADDRESSES,
263 .accept_ra_defrtr = 1,
264 .ra_defrtr_metric = IP6_RT_PRIO_USER,
265 .accept_ra_from_local = 0,
266 .accept_ra_min_hop_limit= 1,
267 .accept_ra_pinfo = 1,
268 #ifdef CONFIG_IPV6_ROUTER_PREF
269 .accept_ra_rtr_pref = 1,
270 .rtr_probe_interval = 60 * HZ,
271 #ifdef CONFIG_IPV6_ROUTE_INFO
272 .accept_ra_rt_info_min_plen = 0,
273 .accept_ra_rt_info_max_plen = 0,
274 #endif
275 #endif
276 .proxy_ndp = 0,
277 .accept_source_route = 0, /* we do not accept RH0 by default. */
278 .disable_ipv6 = 0,
279 .accept_dad = 1,
280 .suppress_frag_ndisc = 1,
281 .accept_ra_mtu = 1,
282 .stable_secret = {
283 .initialized = false,
284 },
285 .use_oif_addrs_only = 0,
286 .ignore_routes_with_linkdown = 0,
287 .keep_addr_on_down = 0,
288 .seg6_enabled = 0,
289 #ifdef CONFIG_IPV6_SEG6_HMAC
290 .seg6_require_hmac = 0,
291 #endif
292 .enhanced_dad = 1,
293 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
294 .disable_policy = 0,
295 .rpl_seg_enabled = 0,
296 };
297
298 /* Check if link is ready: is it up and is a valid qdisc available */
299 static inline bool addrconf_link_ready(const struct net_device *dev)
300 {
301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
302 }
303
304 static void addrconf_del_rs_timer(struct inet6_dev *idev)
305 {
306 if (del_timer(&idev->rs_timer))
307 __in6_dev_put(idev);
308 }
309
310 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
311 {
312 if (cancel_delayed_work(&ifp->dad_work))
313 __in6_ifa_put(ifp);
314 }
315
316 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
317 unsigned long when)
318 {
319 if (!timer_pending(&idev->rs_timer))
320 in6_dev_hold(idev);
321 mod_timer(&idev->rs_timer, jiffies + when);
322 }
323
324 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
325 unsigned long delay)
326 {
327 in6_ifa_hold(ifp);
328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
329 in6_ifa_put(ifp);
330 }
331
332 static int snmp6_alloc_dev(struct inet6_dev *idev)
333 {
334 int i;
335
336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
337 if (!idev->stats.ipv6)
338 goto err_ip;
339
340 for_each_possible_cpu(i) {
341 struct ipstats_mib *addrconf_stats;
342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
343 u64_stats_init(&addrconf_stats->syncp);
344 }
345
346
347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
348 GFP_KERNEL);
349 if (!idev->stats.icmpv6dev)
350 goto err_icmp;
351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
352 GFP_KERNEL);
353 if (!idev->stats.icmpv6msgdev)
354 goto err_icmpmsg;
355
356 return 0;
357
358 err_icmpmsg:
359 kfree(idev->stats.icmpv6dev);
360 err_icmp:
361 free_percpu(idev->stats.ipv6);
362 err_ip:
363 return -ENOMEM;
364 }
365
366 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
367 {
368 struct inet6_dev *ndev;
369 int err = -ENOMEM;
370
371 ASSERT_RTNL();
372
373 if (dev->mtu < IPV6_MIN_MTU)
374 return ERR_PTR(-EINVAL);
375
376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
377 if (!ndev)
378 return ERR_PTR(err);
379
380 rwlock_init(&ndev->lock);
381 ndev->dev = dev;
382 INIT_LIST_HEAD(&ndev->addr_list);
383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
385
386 if (ndev->cnf.stable_secret.initialized)
387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
388
389 ndev->cnf.mtu6 = dev->mtu;
390 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
391 if (!ndev->nd_parms) {
392 kfree(ndev);
393 return ERR_PTR(err);
394 }
395 if (ndev->cnf.forwarding)
396 dev_disable_lro(dev);
397 /* We refer to the device */
398 dev_hold(dev);
399
400 if (snmp6_alloc_dev(ndev) < 0) {
401 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
402 __func__);
403 neigh_parms_release(&nd_tbl, ndev->nd_parms);
404 dev_put(dev);
405 kfree(ndev);
406 return ERR_PTR(err);
407 }
408
409 if (snmp6_register_dev(ndev) < 0) {
410 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
411 __func__, dev->name);
412 goto err_release;
413 }
414
415 /* One reference from device. */
416 refcount_set(&ndev->refcnt, 1);
417
418 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
419 ndev->cnf.accept_dad = -1;
420
421 #if IS_ENABLED(CONFIG_IPV6_SIT)
422 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
423 pr_info("%s: Disabled Multicast RS\n", dev->name);
424 ndev->cnf.rtr_solicits = 0;
425 }
426 #endif
427
428 INIT_LIST_HEAD(&ndev->tempaddr_list);
429 ndev->desync_factor = U32_MAX;
430 if ((dev->flags&IFF_LOOPBACK) ||
431 dev->type == ARPHRD_TUNNEL ||
432 dev->type == ARPHRD_TUNNEL6 ||
433 dev->type == ARPHRD_SIT ||
434 dev->type == ARPHRD_NONE) {
435 ndev->cnf.use_tempaddr = -1;
436 }
437
438 ndev->token = in6addr_any;
439
440 if (netif_running(dev) && addrconf_link_ready(dev))
441 ndev->if_flags |= IF_READY;
442
443 ipv6_mc_init_dev(ndev);
444 ndev->tstamp = jiffies;
445 err = addrconf_sysctl_register(ndev);
446 if (err) {
447 ipv6_mc_destroy_dev(ndev);
448 snmp6_unregister_dev(ndev);
449 goto err_release;
450 }
451 /* protected by rtnl_lock */
452 rcu_assign_pointer(dev->ip6_ptr, ndev);
453
454 /* Join interface-local all-node multicast group */
455 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
456
457 /* Join all-node multicast group */
458 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
459
460 /* Join all-router multicast group if forwarding is set */
461 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
462 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
463
464 return ndev;
465
466 err_release:
467 neigh_parms_release(&nd_tbl, ndev->nd_parms);
468 ndev->dead = 1;
469 in6_dev_finish_destroy(ndev);
470 return ERR_PTR(err);
471 }
472
473 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
474 {
475 struct inet6_dev *idev;
476
477 ASSERT_RTNL();
478
479 idev = __in6_dev_get(dev);
480 if (!idev) {
481 idev = ipv6_add_dev(dev);
482 if (IS_ERR(idev))
483 return idev;
484 }
485
486 if (dev->flags&IFF_UP)
487 ipv6_mc_up(idev);
488 return idev;
489 }
490
491 static int inet6_netconf_msgsize_devconf(int type)
492 {
493 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
494 + nla_total_size(4); /* NETCONFA_IFINDEX */
495 bool all = false;
496
497 if (type == NETCONFA_ALL)
498 all = true;
499
500 if (all || type == NETCONFA_FORWARDING)
501 size += nla_total_size(4);
502 #ifdef CONFIG_IPV6_MROUTE
503 if (all || type == NETCONFA_MC_FORWARDING)
504 size += nla_total_size(4);
505 #endif
506 if (all || type == NETCONFA_PROXY_NEIGH)
507 size += nla_total_size(4);
508
509 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
510 size += nla_total_size(4);
511
512 return size;
513 }
514
515 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
516 struct ipv6_devconf *devconf, u32 portid,
517 u32 seq, int event, unsigned int flags,
518 int type)
519 {
520 struct nlmsghdr *nlh;
521 struct netconfmsg *ncm;
522 bool all = false;
523
524 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
525 flags);
526 if (!nlh)
527 return -EMSGSIZE;
528
529 if (type == NETCONFA_ALL)
530 all = true;
531
532 ncm = nlmsg_data(nlh);
533 ncm->ncm_family = AF_INET6;
534
535 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
536 goto nla_put_failure;
537
538 if (!devconf)
539 goto out;
540
541 if ((all || type == NETCONFA_FORWARDING) &&
542 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
543 goto nla_put_failure;
544 #ifdef CONFIG_IPV6_MROUTE
545 if ((all || type == NETCONFA_MC_FORWARDING) &&
546 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
547 devconf->mc_forwarding) < 0)
548 goto nla_put_failure;
549 #endif
550 if ((all || type == NETCONFA_PROXY_NEIGH) &&
551 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
552 goto nla_put_failure;
553
554 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
555 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
556 devconf->ignore_routes_with_linkdown) < 0)
557 goto nla_put_failure;
558
559 out:
560 nlmsg_end(skb, nlh);
561 return 0;
562
563 nla_put_failure:
564 nlmsg_cancel(skb, nlh);
565 return -EMSGSIZE;
566 }
567
568 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
569 int ifindex, struct ipv6_devconf *devconf)
570 {
571 struct sk_buff *skb;
572 int err = -ENOBUFS;
573
574 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
575 if (!skb)
576 goto errout;
577
578 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
579 event, 0, type);
580 if (err < 0) {
581 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
582 WARN_ON(err == -EMSGSIZE);
583 kfree_skb(skb);
584 goto errout;
585 }
586 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
587 return;
588 errout:
589 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
590 }
591
592 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
593 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
594 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
595 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
596 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
597 };
598
599 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
600 const struct nlmsghdr *nlh,
601 struct nlattr **tb,
602 struct netlink_ext_ack *extack)
603 {
604 int i, err;
605
606 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
607 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
608 return -EINVAL;
609 }
610
611 if (!netlink_strict_get_check(skb))
612 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
613 tb, NETCONFA_MAX,
614 devconf_ipv6_policy, extack);
615
616 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
617 tb, NETCONFA_MAX,
618 devconf_ipv6_policy, extack);
619 if (err)
620 return err;
621
622 for (i = 0; i <= NETCONFA_MAX; i++) {
623 if (!tb[i])
624 continue;
625
626 switch (i) {
627 case NETCONFA_IFINDEX:
628 break;
629 default:
630 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
631 return -EINVAL;
632 }
633 }
634
635 return 0;
636 }
637
638 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
639 struct nlmsghdr *nlh,
640 struct netlink_ext_ack *extack)
641 {
642 struct net *net = sock_net(in_skb->sk);
643 struct nlattr *tb[NETCONFA_MAX+1];
644 struct inet6_dev *in6_dev = NULL;
645 struct net_device *dev = NULL;
646 struct sk_buff *skb;
647 struct ipv6_devconf *devconf;
648 int ifindex;
649 int err;
650
651 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
652 if (err < 0)
653 return err;
654
655 if (!tb[NETCONFA_IFINDEX])
656 return -EINVAL;
657
658 err = -EINVAL;
659 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
660 switch (ifindex) {
661 case NETCONFA_IFINDEX_ALL:
662 devconf = net->ipv6.devconf_all;
663 break;
664 case NETCONFA_IFINDEX_DEFAULT:
665 devconf = net->ipv6.devconf_dflt;
666 break;
667 default:
668 dev = dev_get_by_index(net, ifindex);
669 if (!dev)
670 return -EINVAL;
671 in6_dev = in6_dev_get(dev);
672 if (!in6_dev)
673 goto errout;
674 devconf = &in6_dev->cnf;
675 break;
676 }
677
678 err = -ENOBUFS;
679 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
680 if (!skb)
681 goto errout;
682
683 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
684 NETLINK_CB(in_skb).portid,
685 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
686 NETCONFA_ALL);
687 if (err < 0) {
688 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
689 WARN_ON(err == -EMSGSIZE);
690 kfree_skb(skb);
691 goto errout;
692 }
693 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
694 errout:
695 if (in6_dev)
696 in6_dev_put(in6_dev);
697 if (dev)
698 dev_put(dev);
699 return err;
700 }
701
702 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
703 struct netlink_callback *cb)
704 {
705 const struct nlmsghdr *nlh = cb->nlh;
706 struct net *net = sock_net(skb->sk);
707 int h, s_h;
708 int idx, s_idx;
709 struct net_device *dev;
710 struct inet6_dev *idev;
711 struct hlist_head *head;
712
713 if (cb->strict_check) {
714 struct netlink_ext_ack *extack = cb->extack;
715 struct netconfmsg *ncm;
716
717 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
718 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
719 return -EINVAL;
720 }
721
722 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
723 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
724 return -EINVAL;
725 }
726 }
727
728 s_h = cb->args[0];
729 s_idx = idx = cb->args[1];
730
731 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
732 idx = 0;
733 head = &net->dev_index_head[h];
734 rcu_read_lock();
735 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
736 net->dev_base_seq;
737 hlist_for_each_entry_rcu(dev, head, index_hlist) {
738 if (idx < s_idx)
739 goto cont;
740 idev = __in6_dev_get(dev);
741 if (!idev)
742 goto cont;
743
744 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
745 &idev->cnf,
746 NETLINK_CB(cb->skb).portid,
747 nlh->nlmsg_seq,
748 RTM_NEWNETCONF,
749 NLM_F_MULTI,
750 NETCONFA_ALL) < 0) {
751 rcu_read_unlock();
752 goto done;
753 }
754 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
755 cont:
756 idx++;
757 }
758 rcu_read_unlock();
759 }
760 if (h == NETDEV_HASHENTRIES) {
761 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
762 net->ipv6.devconf_all,
763 NETLINK_CB(cb->skb).portid,
764 nlh->nlmsg_seq,
765 RTM_NEWNETCONF, NLM_F_MULTI,
766 NETCONFA_ALL) < 0)
767 goto done;
768 else
769 h++;
770 }
771 if (h == NETDEV_HASHENTRIES + 1) {
772 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
773 net->ipv6.devconf_dflt,
774 NETLINK_CB(cb->skb).portid,
775 nlh->nlmsg_seq,
776 RTM_NEWNETCONF, NLM_F_MULTI,
777 NETCONFA_ALL) < 0)
778 goto done;
779 else
780 h++;
781 }
782 done:
783 cb->args[0] = h;
784 cb->args[1] = idx;
785
786 return skb->len;
787 }
788
789 #ifdef CONFIG_SYSCTL
790 static void dev_forward_change(struct inet6_dev *idev)
791 {
792 struct net_device *dev;
793 struct inet6_ifaddr *ifa;
794
795 if (!idev)
796 return;
797 dev = idev->dev;
798 if (idev->cnf.forwarding)
799 dev_disable_lro(dev);
800 if (dev->flags & IFF_MULTICAST) {
801 if (idev->cnf.forwarding) {
802 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
803 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
804 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
805 } else {
806 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
807 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
808 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
809 }
810 }
811
812 list_for_each_entry(ifa, &idev->addr_list, if_list) {
813 if (ifa->flags&IFA_F_TENTATIVE)
814 continue;
815 if (idev->cnf.forwarding)
816 addrconf_join_anycast(ifa);
817 else
818 addrconf_leave_anycast(ifa);
819 }
820 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
821 NETCONFA_FORWARDING,
822 dev->ifindex, &idev->cnf);
823 }
824
825
826 static void addrconf_forward_change(struct net *net, __s32 newf)
827 {
828 struct net_device *dev;
829 struct inet6_dev *idev;
830
831 for_each_netdev(net, dev) {
832 idev = __in6_dev_get(dev);
833 if (idev) {
834 int changed = (!idev->cnf.forwarding) ^ (!newf);
835 idev->cnf.forwarding = newf;
836 if (changed)
837 dev_forward_change(idev);
838 }
839 }
840 }
841
842 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
843 {
844 struct net *net;
845 int old;
846
847 if (!rtnl_trylock())
848 return restart_syscall();
849
850 net = (struct net *)table->extra2;
851 old = *p;
852 *p = newf;
853
854 if (p == &net->ipv6.devconf_dflt->forwarding) {
855 if ((!newf) ^ (!old))
856 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
857 NETCONFA_FORWARDING,
858 NETCONFA_IFINDEX_DEFAULT,
859 net->ipv6.devconf_dflt);
860 rtnl_unlock();
861 return 0;
862 }
863
864 if (p == &net->ipv6.devconf_all->forwarding) {
865 int old_dflt = net->ipv6.devconf_dflt->forwarding;
866
867 net->ipv6.devconf_dflt->forwarding = newf;
868 if ((!newf) ^ (!old_dflt))
869 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
870 NETCONFA_FORWARDING,
871 NETCONFA_IFINDEX_DEFAULT,
872 net->ipv6.devconf_dflt);
873
874 addrconf_forward_change(net, newf);
875 if ((!newf) ^ (!old))
876 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
877 NETCONFA_FORWARDING,
878 NETCONFA_IFINDEX_ALL,
879 net->ipv6.devconf_all);
880 } else if ((!newf) ^ (!old))
881 dev_forward_change((struct inet6_dev *)table->extra1);
882 rtnl_unlock();
883
884 if (newf)
885 rt6_purge_dflt_routers(net);
886 return 1;
887 }
888
889 static void addrconf_linkdown_change(struct net *net, __s32 newf)
890 {
891 struct net_device *dev;
892 struct inet6_dev *idev;
893
894 for_each_netdev(net, dev) {
895 idev = __in6_dev_get(dev);
896 if (idev) {
897 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
898
899 idev->cnf.ignore_routes_with_linkdown = newf;
900 if (changed)
901 inet6_netconf_notify_devconf(dev_net(dev),
902 RTM_NEWNETCONF,
903 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
904 dev->ifindex,
905 &idev->cnf);
906 }
907 }
908 }
909
910 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
911 {
912 struct net *net;
913 int old;
914
915 if (!rtnl_trylock())
916 return restart_syscall();
917
918 net = (struct net *)table->extra2;
919 old = *p;
920 *p = newf;
921
922 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
923 if ((!newf) ^ (!old))
924 inet6_netconf_notify_devconf(net,
925 RTM_NEWNETCONF,
926 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
927 NETCONFA_IFINDEX_DEFAULT,
928 net->ipv6.devconf_dflt);
929 rtnl_unlock();
930 return 0;
931 }
932
933 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
934 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
935 addrconf_linkdown_change(net, newf);
936 if ((!newf) ^ (!old))
937 inet6_netconf_notify_devconf(net,
938 RTM_NEWNETCONF,
939 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
940 NETCONFA_IFINDEX_ALL,
941 net->ipv6.devconf_all);
942 }
943 rtnl_unlock();
944
945 return 1;
946 }
947
948 #endif
949
950 /* Nobody refers to this ifaddr, destroy it */
951 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
952 {
953 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
954
955 #ifdef NET_REFCNT_DEBUG
956 pr_debug("%s\n", __func__);
957 #endif
958
959 in6_dev_put(ifp->idev);
960
961 if (cancel_delayed_work(&ifp->dad_work))
962 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
963 ifp);
964
965 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
966 pr_warn("Freeing alive inet6 address %p\n", ifp);
967 return;
968 }
969
970 kfree_rcu(ifp, rcu);
971 }
972
973 static void
974 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
975 {
976 struct list_head *p;
977 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
978
979 /*
980 * Each device address list is sorted in order of scope -
981 * global before linklocal.
982 */
983 list_for_each(p, &idev->addr_list) {
984 struct inet6_ifaddr *ifa
985 = list_entry(p, struct inet6_ifaddr, if_list);
986 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
987 break;
988 }
989
990 list_add_tail_rcu(&ifp->if_list, p);
991 }
992
993 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
994 {
995 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
996
997 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
998 }
999
1000 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1001 struct net_device *dev, unsigned int hash)
1002 {
1003 struct inet6_ifaddr *ifp;
1004
1005 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1006 if (!net_eq(dev_net(ifp->idev->dev), net))
1007 continue;
1008 if (ipv6_addr_equal(&ifp->addr, addr)) {
1009 if (!dev || ifp->idev->dev == dev)
1010 return true;
1011 }
1012 }
1013 return false;
1014 }
1015
1016 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1017 {
1018 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1019 int err = 0;
1020
1021 spin_lock(&addrconf_hash_lock);
1022
1023 /* Ignore adding duplicate addresses on an interface */
1024 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1025 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1026 err = -EEXIST;
1027 } else {
1028 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1029 }
1030
1031 spin_unlock(&addrconf_hash_lock);
1032
1033 return err;
1034 }
1035
1036 /* On success it returns ifp with increased reference count */
1037
1038 static struct inet6_ifaddr *
1039 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1040 bool can_block, struct netlink_ext_ack *extack)
1041 {
1042 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1043 int addr_type = ipv6_addr_type(cfg->pfx);
1044 struct net *net = dev_net(idev->dev);
1045 struct inet6_ifaddr *ifa = NULL;
1046 struct fib6_info *f6i = NULL;
1047 int err = 0;
1048
1049 if (addr_type == IPV6_ADDR_ANY ||
1050 (addr_type & IPV6_ADDR_MULTICAST &&
1051 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1052 (!(idev->dev->flags & IFF_LOOPBACK) &&
1053 !netif_is_l3_master(idev->dev) &&
1054 addr_type & IPV6_ADDR_LOOPBACK))
1055 return ERR_PTR(-EADDRNOTAVAIL);
1056
1057 if (idev->dead) {
1058 err = -ENODEV; /*XXX*/
1059 goto out;
1060 }
1061
1062 if (idev->cnf.disable_ipv6) {
1063 err = -EACCES;
1064 goto out;
1065 }
1066
1067 /* validator notifier needs to be blocking;
1068 * do not call in atomic context
1069 */
1070 if (can_block) {
1071 struct in6_validator_info i6vi = {
1072 .i6vi_addr = *cfg->pfx,
1073 .i6vi_dev = idev,
1074 .extack = extack,
1075 };
1076
1077 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1078 err = notifier_to_errno(err);
1079 if (err < 0)
1080 goto out;
1081 }
1082
1083 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1084 if (!ifa) {
1085 err = -ENOBUFS;
1086 goto out;
1087 }
1088
1089 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1090 if (IS_ERR(f6i)) {
1091 err = PTR_ERR(f6i);
1092 f6i = NULL;
1093 goto out;
1094 }
1095
1096 if (net->ipv6.devconf_all->disable_policy ||
1097 idev->cnf.disable_policy)
1098 f6i->dst_nopolicy = true;
1099
1100 neigh_parms_data_state_setall(idev->nd_parms);
1101
1102 ifa->addr = *cfg->pfx;
1103 if (cfg->peer_pfx)
1104 ifa->peer_addr = *cfg->peer_pfx;
1105
1106 spin_lock_init(&ifa->lock);
1107 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1108 INIT_HLIST_NODE(&ifa->addr_lst);
1109 ifa->scope = cfg->scope;
1110 ifa->prefix_len = cfg->plen;
1111 ifa->rt_priority = cfg->rt_priority;
1112 ifa->flags = cfg->ifa_flags;
1113 /* No need to add the TENTATIVE flag for addresses with NODAD */
1114 if (!(cfg->ifa_flags & IFA_F_NODAD))
1115 ifa->flags |= IFA_F_TENTATIVE;
1116 ifa->valid_lft = cfg->valid_lft;
1117 ifa->prefered_lft = cfg->preferred_lft;
1118 ifa->cstamp = ifa->tstamp = jiffies;
1119 ifa->tokenized = false;
1120
1121 ifa->rt = f6i;
1122
1123 ifa->idev = idev;
1124 in6_dev_hold(idev);
1125
1126 /* For caller */
1127 refcount_set(&ifa->refcnt, 1);
1128
1129 rcu_read_lock_bh();
1130
1131 err = ipv6_add_addr_hash(idev->dev, ifa);
1132 if (err < 0) {
1133 rcu_read_unlock_bh();
1134 goto out;
1135 }
1136
1137 write_lock(&idev->lock);
1138
1139 /* Add to inet6_dev unicast addr list. */
1140 ipv6_link_dev_addr(idev, ifa);
1141
1142 if (ifa->flags&IFA_F_TEMPORARY) {
1143 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1144 in6_ifa_hold(ifa);
1145 }
1146
1147 in6_ifa_hold(ifa);
1148 write_unlock(&idev->lock);
1149
1150 rcu_read_unlock_bh();
1151
1152 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1153 out:
1154 if (unlikely(err < 0)) {
1155 fib6_info_release(f6i);
1156
1157 if (ifa) {
1158 if (ifa->idev)
1159 in6_dev_put(ifa->idev);
1160 kfree(ifa);
1161 }
1162 ifa = ERR_PTR(err);
1163 }
1164
1165 return ifa;
1166 }
1167
1168 enum cleanup_prefix_rt_t {
1169 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1170 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1171 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1172 };
1173
1174 /*
1175 * Check, whether the prefix for ifp would still need a prefix route
1176 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1177 * constants.
1178 *
1179 * 1) we don't purge prefix if address was not permanent.
1180 * prefix is managed by its own lifetime.
1181 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1182 * 3) if there are no addresses, delete prefix.
1183 * 4) if there are still other permanent address(es),
1184 * corresponding prefix is still permanent.
1185 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1186 * don't purge the prefix, assume user space is managing it.
1187 * 6) otherwise, update prefix lifetime to the
1188 * longest valid lifetime among the corresponding
1189 * addresses on the device.
1190 * Note: subsequent RA will update lifetime.
1191 **/
1192 static enum cleanup_prefix_rt_t
1193 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1194 {
1195 struct inet6_ifaddr *ifa;
1196 struct inet6_dev *idev = ifp->idev;
1197 unsigned long lifetime;
1198 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1199
1200 *expires = jiffies;
1201
1202 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1203 if (ifa == ifp)
1204 continue;
1205 if (ifa->prefix_len != ifp->prefix_len ||
1206 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1207 ifp->prefix_len))
1208 continue;
1209 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1210 return CLEANUP_PREFIX_RT_NOP;
1211
1212 action = CLEANUP_PREFIX_RT_EXPIRE;
1213
1214 spin_lock(&ifa->lock);
1215
1216 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1217 /*
1218 * Note: Because this address is
1219 * not permanent, lifetime <
1220 * LONG_MAX / HZ here.
1221 */
1222 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1223 *expires = ifa->tstamp + lifetime * HZ;
1224 spin_unlock(&ifa->lock);
1225 }
1226
1227 return action;
1228 }
1229
1230 static void
1231 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1232 bool del_rt, bool del_peer)
1233 {
1234 struct fib6_info *f6i;
1235
1236 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1237 ifp->prefix_len,
1238 ifp->idev->dev, 0, RTF_DEFAULT, true);
1239 if (f6i) {
1240 if (del_rt)
1241 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1242 else {
1243 if (!(f6i->fib6_flags & RTF_EXPIRES))
1244 fib6_set_expires(f6i, expires);
1245 fib6_info_release(f6i);
1246 }
1247 }
1248 }
1249
1250
1251 /* This function wants to get referenced ifp and releases it before return */
1252
1253 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1254 {
1255 int state;
1256 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1257 unsigned long expires;
1258
1259 ASSERT_RTNL();
1260
1261 spin_lock_bh(&ifp->lock);
1262 state = ifp->state;
1263 ifp->state = INET6_IFADDR_STATE_DEAD;
1264 spin_unlock_bh(&ifp->lock);
1265
1266 if (state == INET6_IFADDR_STATE_DEAD)
1267 goto out;
1268
1269 spin_lock_bh(&addrconf_hash_lock);
1270 hlist_del_init_rcu(&ifp->addr_lst);
1271 spin_unlock_bh(&addrconf_hash_lock);
1272
1273 write_lock_bh(&ifp->idev->lock);
1274
1275 if (ifp->flags&IFA_F_TEMPORARY) {
1276 list_del(&ifp->tmp_list);
1277 if (ifp->ifpub) {
1278 in6_ifa_put(ifp->ifpub);
1279 ifp->ifpub = NULL;
1280 }
1281 __in6_ifa_put(ifp);
1282 }
1283
1284 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1285 action = check_cleanup_prefix_route(ifp, &expires);
1286
1287 list_del_rcu(&ifp->if_list);
1288 __in6_ifa_put(ifp);
1289
1290 write_unlock_bh(&ifp->idev->lock);
1291
1292 addrconf_del_dad_work(ifp);
1293
1294 ipv6_ifa_notify(RTM_DELADDR, ifp);
1295
1296 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1297
1298 if (action != CLEANUP_PREFIX_RT_NOP) {
1299 cleanup_prefix_route(ifp, expires,
1300 action == CLEANUP_PREFIX_RT_DEL, false);
1301 }
1302
1303 /* clean up prefsrc entries */
1304 rt6_remove_prefsrc(ifp);
1305 out:
1306 in6_ifa_put(ifp);
1307 }
1308
1309 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1310 {
1311 struct inet6_dev *idev = ifp->idev;
1312 unsigned long tmp_tstamp, age;
1313 unsigned long regen_advance;
1314 unsigned long now = jiffies;
1315 s32 cnf_temp_preferred_lft;
1316 struct inet6_ifaddr *ift;
1317 struct ifa6_config cfg;
1318 long max_desync_factor;
1319 struct in6_addr addr;
1320 int ret = 0;
1321
1322 write_lock_bh(&idev->lock);
1323
1324 retry:
1325 in6_dev_hold(idev);
1326 if (idev->cnf.use_tempaddr <= 0) {
1327 write_unlock_bh(&idev->lock);
1328 pr_info("%s: use_tempaddr is disabled\n", __func__);
1329 in6_dev_put(idev);
1330 ret = -1;
1331 goto out;
1332 }
1333 spin_lock_bh(&ifp->lock);
1334 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1335 idev->cnf.use_tempaddr = -1; /*XXX*/
1336 spin_unlock_bh(&ifp->lock);
1337 write_unlock_bh(&idev->lock);
1338 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1339 __func__);
1340 in6_dev_put(idev);
1341 ret = -1;
1342 goto out;
1343 }
1344 in6_ifa_hold(ifp);
1345 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1346 ipv6_gen_rnd_iid(&addr);
1347
1348 age = (now - ifp->tstamp) / HZ;
1349
1350 regen_advance = idev->cnf.regen_max_retry *
1351 idev->cnf.dad_transmits *
1352 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1353
1354 /* recalculate max_desync_factor each time and update
1355 * idev->desync_factor if it's larger
1356 */
1357 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1358 max_desync_factor = min_t(__u32,
1359 idev->cnf.max_desync_factor,
1360 cnf_temp_preferred_lft - regen_advance);
1361
1362 if (unlikely(idev->desync_factor > max_desync_factor)) {
1363 if (max_desync_factor > 0) {
1364 get_random_bytes(&idev->desync_factor,
1365 sizeof(idev->desync_factor));
1366 idev->desync_factor %= max_desync_factor;
1367 } else {
1368 idev->desync_factor = 0;
1369 }
1370 }
1371
1372 memset(&cfg, 0, sizeof(cfg));
1373 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1374 idev->cnf.temp_valid_lft + age);
1375 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1376 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1377
1378 cfg.plen = ifp->prefix_len;
1379 tmp_tstamp = ifp->tstamp;
1380 spin_unlock_bh(&ifp->lock);
1381
1382 write_unlock_bh(&idev->lock);
1383
1384 /* A temporary address is created only if this calculated Preferred
1385 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1386 * an implementation must not create a temporary address with a zero
1387 * Preferred Lifetime.
1388 * Use age calculation as in addrconf_verify to avoid unnecessary
1389 * temporary addresses being generated.
1390 */
1391 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1392 if (cfg.preferred_lft <= regen_advance + age) {
1393 in6_ifa_put(ifp);
1394 in6_dev_put(idev);
1395 ret = -1;
1396 goto out;
1397 }
1398
1399 cfg.ifa_flags = IFA_F_TEMPORARY;
1400 /* set in addrconf_prefix_rcv() */
1401 if (ifp->flags & IFA_F_OPTIMISTIC)
1402 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1403
1404 cfg.pfx = &addr;
1405 cfg.scope = ipv6_addr_scope(cfg.pfx);
1406
1407 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1408 if (IS_ERR(ift)) {
1409 in6_ifa_put(ifp);
1410 in6_dev_put(idev);
1411 pr_info("%s: retry temporary address regeneration\n", __func__);
1412 write_lock_bh(&idev->lock);
1413 goto retry;
1414 }
1415
1416 spin_lock_bh(&ift->lock);
1417 ift->ifpub = ifp;
1418 ift->cstamp = now;
1419 ift->tstamp = tmp_tstamp;
1420 spin_unlock_bh(&ift->lock);
1421
1422 addrconf_dad_start(ift);
1423 in6_ifa_put(ift);
1424 in6_dev_put(idev);
1425 out:
1426 return ret;
1427 }
1428
1429 /*
1430 * Choose an appropriate source address (RFC3484)
1431 */
1432 enum {
1433 IPV6_SADDR_RULE_INIT = 0,
1434 IPV6_SADDR_RULE_LOCAL,
1435 IPV6_SADDR_RULE_SCOPE,
1436 IPV6_SADDR_RULE_PREFERRED,
1437 #ifdef CONFIG_IPV6_MIP6
1438 IPV6_SADDR_RULE_HOA,
1439 #endif
1440 IPV6_SADDR_RULE_OIF,
1441 IPV6_SADDR_RULE_LABEL,
1442 IPV6_SADDR_RULE_PRIVACY,
1443 IPV6_SADDR_RULE_ORCHID,
1444 IPV6_SADDR_RULE_PREFIX,
1445 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1446 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1447 #endif
1448 IPV6_SADDR_RULE_MAX
1449 };
1450
1451 struct ipv6_saddr_score {
1452 int rule;
1453 int addr_type;
1454 struct inet6_ifaddr *ifa;
1455 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1456 int scopedist;
1457 int matchlen;
1458 };
1459
1460 struct ipv6_saddr_dst {
1461 const struct in6_addr *addr;
1462 int ifindex;
1463 int scope;
1464 int label;
1465 unsigned int prefs;
1466 };
1467
1468 static inline int ipv6_saddr_preferred(int type)
1469 {
1470 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1471 return 1;
1472 return 0;
1473 }
1474
1475 static bool ipv6_use_optimistic_addr(struct net *net,
1476 struct inet6_dev *idev)
1477 {
1478 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1479 if (!idev)
1480 return false;
1481 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1482 return false;
1483 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1484 return false;
1485
1486 return true;
1487 #else
1488 return false;
1489 #endif
1490 }
1491
1492 static bool ipv6_allow_optimistic_dad(struct net *net,
1493 struct inet6_dev *idev)
1494 {
1495 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1496 if (!idev)
1497 return false;
1498 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1499 return false;
1500
1501 return true;
1502 #else
1503 return false;
1504 #endif
1505 }
1506
1507 static int ipv6_get_saddr_eval(struct net *net,
1508 struct ipv6_saddr_score *score,
1509 struct ipv6_saddr_dst *dst,
1510 int i)
1511 {
1512 int ret;
1513
1514 if (i <= score->rule) {
1515 switch (i) {
1516 case IPV6_SADDR_RULE_SCOPE:
1517 ret = score->scopedist;
1518 break;
1519 case IPV6_SADDR_RULE_PREFIX:
1520 ret = score->matchlen;
1521 break;
1522 default:
1523 ret = !!test_bit(i, score->scorebits);
1524 }
1525 goto out;
1526 }
1527
1528 switch (i) {
1529 case IPV6_SADDR_RULE_INIT:
1530 /* Rule 0: remember if hiscore is not ready yet */
1531 ret = !!score->ifa;
1532 break;
1533 case IPV6_SADDR_RULE_LOCAL:
1534 /* Rule 1: Prefer same address */
1535 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1536 break;
1537 case IPV6_SADDR_RULE_SCOPE:
1538 /* Rule 2: Prefer appropriate scope
1539 *
1540 * ret
1541 * ^
1542 * -1 | d 15
1543 * ---+--+-+---> scope
1544 * |
1545 * | d is scope of the destination.
1546 * B-d | \
1547 * | \ <- smaller scope is better if
1548 * B-15 | \ if scope is enough for destination.
1549 * | ret = B - scope (-1 <= scope >= d <= 15).
1550 * d-C-1 | /
1551 * |/ <- greater is better
1552 * -C / if scope is not enough for destination.
1553 * /| ret = scope - C (-1 <= d < scope <= 15).
1554 *
1555 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1556 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1557 * Assume B = 0 and we get C > 29.
1558 */
1559 ret = __ipv6_addr_src_scope(score->addr_type);
1560 if (ret >= dst->scope)
1561 ret = -ret;
1562 else
1563 ret -= 128; /* 30 is enough */
1564 score->scopedist = ret;
1565 break;
1566 case IPV6_SADDR_RULE_PREFERRED:
1567 {
1568 /* Rule 3: Avoid deprecated and optimistic addresses */
1569 u8 avoid = IFA_F_DEPRECATED;
1570
1571 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1572 avoid |= IFA_F_OPTIMISTIC;
1573 ret = ipv6_saddr_preferred(score->addr_type) ||
1574 !(score->ifa->flags & avoid);
1575 break;
1576 }
1577 #ifdef CONFIG_IPV6_MIP6
1578 case IPV6_SADDR_RULE_HOA:
1579 {
1580 /* Rule 4: Prefer home address */
1581 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1582 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1583 break;
1584 }
1585 #endif
1586 case IPV6_SADDR_RULE_OIF:
1587 /* Rule 5: Prefer outgoing interface */
1588 ret = (!dst->ifindex ||
1589 dst->ifindex == score->ifa->idev->dev->ifindex);
1590 break;
1591 case IPV6_SADDR_RULE_LABEL:
1592 /* Rule 6: Prefer matching label */
1593 ret = ipv6_addr_label(net,
1594 &score->ifa->addr, score->addr_type,
1595 score->ifa->idev->dev->ifindex) == dst->label;
1596 break;
1597 case IPV6_SADDR_RULE_PRIVACY:
1598 {
1599 /* Rule 7: Prefer public address
1600 * Note: prefer temporary address if use_tempaddr >= 2
1601 */
1602 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1603 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1604 score->ifa->idev->cnf.use_tempaddr >= 2;
1605 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1606 break;
1607 }
1608 case IPV6_SADDR_RULE_ORCHID:
1609 /* Rule 8-: Prefer ORCHID vs ORCHID or
1610 * non-ORCHID vs non-ORCHID
1611 */
1612 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1613 ipv6_addr_orchid(dst->addr));
1614 break;
1615 case IPV6_SADDR_RULE_PREFIX:
1616 /* Rule 8: Use longest matching prefix */
1617 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1618 if (ret > score->ifa->prefix_len)
1619 ret = score->ifa->prefix_len;
1620 score->matchlen = ret;
1621 break;
1622 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1623 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1624 /* Optimistic addresses still have lower precedence than other
1625 * preferred addresses.
1626 */
1627 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1628 break;
1629 #endif
1630 default:
1631 ret = 0;
1632 }
1633
1634 if (ret)
1635 __set_bit(i, score->scorebits);
1636 score->rule = i;
1637 out:
1638 return ret;
1639 }
1640
1641 static int __ipv6_dev_get_saddr(struct net *net,
1642 struct ipv6_saddr_dst *dst,
1643 struct inet6_dev *idev,
1644 struct ipv6_saddr_score *scores,
1645 int hiscore_idx)
1646 {
1647 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1648
1649 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1650 int i;
1651
1652 /*
1653 * - Tentative Address (RFC2462 section 5.4)
1654 * - A tentative address is not considered
1655 * "assigned to an interface" in the traditional
1656 * sense, unless it is also flagged as optimistic.
1657 * - Candidate Source Address (section 4)
1658 * - In any case, anycast addresses, multicast
1659 * addresses, and the unspecified address MUST
1660 * NOT be included in a candidate set.
1661 */
1662 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1663 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1664 continue;
1665
1666 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1667
1668 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1669 score->addr_type & IPV6_ADDR_MULTICAST)) {
1670 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1671 idev->dev->name);
1672 continue;
1673 }
1674
1675 score->rule = -1;
1676 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1677
1678 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1679 int minihiscore, miniscore;
1680
1681 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1682 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1683
1684 if (minihiscore > miniscore) {
1685 if (i == IPV6_SADDR_RULE_SCOPE &&
1686 score->scopedist > 0) {
1687 /*
1688 * special case:
1689 * each remaining entry
1690 * has too small (not enough)
1691 * scope, because ifa entries
1692 * are sorted by their scope
1693 * values.
1694 */
1695 goto out;
1696 }
1697 break;
1698 } else if (minihiscore < miniscore) {
1699 swap(hiscore, score);
1700 hiscore_idx = 1 - hiscore_idx;
1701
1702 /* restore our iterator */
1703 score->ifa = hiscore->ifa;
1704
1705 break;
1706 }
1707 }
1708 }
1709 out:
1710 return hiscore_idx;
1711 }
1712
1713 static int ipv6_get_saddr_master(struct net *net,
1714 const struct net_device *dst_dev,
1715 const struct net_device *master,
1716 struct ipv6_saddr_dst *dst,
1717 struct ipv6_saddr_score *scores,
1718 int hiscore_idx)
1719 {
1720 struct inet6_dev *idev;
1721
1722 idev = __in6_dev_get(dst_dev);
1723 if (idev)
1724 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1725 scores, hiscore_idx);
1726
1727 idev = __in6_dev_get(master);
1728 if (idev)
1729 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1730 scores, hiscore_idx);
1731
1732 return hiscore_idx;
1733 }
1734
1735 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1736 const struct in6_addr *daddr, unsigned int prefs,
1737 struct in6_addr *saddr)
1738 {
1739 struct ipv6_saddr_score scores[2], *hiscore;
1740 struct ipv6_saddr_dst dst;
1741 struct inet6_dev *idev;
1742 struct net_device *dev;
1743 int dst_type;
1744 bool use_oif_addr = false;
1745 int hiscore_idx = 0;
1746 int ret = 0;
1747
1748 dst_type = __ipv6_addr_type(daddr);
1749 dst.addr = daddr;
1750 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1751 dst.scope = __ipv6_addr_src_scope(dst_type);
1752 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1753 dst.prefs = prefs;
1754
1755 scores[hiscore_idx].rule = -1;
1756 scores[hiscore_idx].ifa = NULL;
1757
1758 rcu_read_lock();
1759
1760 /* Candidate Source Address (section 4)
1761 * - multicast and link-local destination address,
1762 * the set of candidate source address MUST only
1763 * include addresses assigned to interfaces
1764 * belonging to the same link as the outgoing
1765 * interface.
1766 * (- For site-local destination addresses, the
1767 * set of candidate source addresses MUST only
1768 * include addresses assigned to interfaces
1769 * belonging to the same site as the outgoing
1770 * interface.)
1771 * - "It is RECOMMENDED that the candidate source addresses
1772 * be the set of unicast addresses assigned to the
1773 * interface that will be used to send to the destination
1774 * (the 'outgoing' interface)." (RFC 6724)
1775 */
1776 if (dst_dev) {
1777 idev = __in6_dev_get(dst_dev);
1778 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1779 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1780 (idev && idev->cnf.use_oif_addrs_only)) {
1781 use_oif_addr = true;
1782 }
1783 }
1784
1785 if (use_oif_addr) {
1786 if (idev)
1787 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1788 } else {
1789 const struct net_device *master;
1790 int master_idx = 0;
1791
1792 /* if dst_dev exists and is enslaved to an L3 device, then
1793 * prefer addresses from dst_dev and then the master over
1794 * any other enslaved devices in the L3 domain.
1795 */
1796 master = l3mdev_master_dev_rcu(dst_dev);
1797 if (master) {
1798 master_idx = master->ifindex;
1799
1800 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1801 master, &dst,
1802 scores, hiscore_idx);
1803
1804 if (scores[hiscore_idx].ifa)
1805 goto out;
1806 }
1807
1808 for_each_netdev_rcu(net, dev) {
1809 /* only consider addresses on devices in the
1810 * same L3 domain
1811 */
1812 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1813 continue;
1814 idev = __in6_dev_get(dev);
1815 if (!idev)
1816 continue;
1817 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1818 }
1819 }
1820
1821 out:
1822 hiscore = &scores[hiscore_idx];
1823 if (!hiscore->ifa)
1824 ret = -EADDRNOTAVAIL;
1825 else
1826 *saddr = hiscore->ifa->addr;
1827
1828 rcu_read_unlock();
1829 return ret;
1830 }
1831 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1832
1833 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1834 u32 banned_flags)
1835 {
1836 struct inet6_ifaddr *ifp;
1837 int err = -EADDRNOTAVAIL;
1838
1839 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1840 if (ifp->scope > IFA_LINK)
1841 break;
1842 if (ifp->scope == IFA_LINK &&
1843 !(ifp->flags & banned_flags)) {
1844 *addr = ifp->addr;
1845 err = 0;
1846 break;
1847 }
1848 }
1849 return err;
1850 }
1851
1852 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1853 u32 banned_flags)
1854 {
1855 struct inet6_dev *idev;
1856 int err = -EADDRNOTAVAIL;
1857
1858 rcu_read_lock();
1859 idev = __in6_dev_get(dev);
1860 if (idev) {
1861 read_lock_bh(&idev->lock);
1862 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1863 read_unlock_bh(&idev->lock);
1864 }
1865 rcu_read_unlock();
1866 return err;
1867 }
1868
1869 static int ipv6_count_addresses(const struct inet6_dev *idev)
1870 {
1871 const struct inet6_ifaddr *ifp;
1872 int cnt = 0;
1873
1874 rcu_read_lock();
1875 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1876 cnt++;
1877 rcu_read_unlock();
1878 return cnt;
1879 }
1880
1881 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1882 const struct net_device *dev, int strict)
1883 {
1884 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1885 strict, IFA_F_TENTATIVE);
1886 }
1887 EXPORT_SYMBOL(ipv6_chk_addr);
1888
1889 /* device argument is used to find the L3 domain of interest. If
1890 * skip_dev_check is set, then the ifp device is not checked against
1891 * the passed in dev argument. So the 2 cases for addresses checks are:
1892 * 1. does the address exist in the L3 domain that dev is part of
1893 * (skip_dev_check = true), or
1894 *
1895 * 2. does the address exist on the specific device
1896 * (skip_dev_check = false)
1897 */
1898 static struct net_device *
1899 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1900 const struct net_device *dev, bool skip_dev_check,
1901 int strict, u32 banned_flags)
1902 {
1903 unsigned int hash = inet6_addr_hash(net, addr);
1904 struct net_device *l3mdev, *ndev;
1905 struct inet6_ifaddr *ifp;
1906 u32 ifp_flags;
1907
1908 rcu_read_lock();
1909
1910 l3mdev = l3mdev_master_dev_rcu(dev);
1911 if (skip_dev_check)
1912 dev = NULL;
1913
1914 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1915 ndev = ifp->idev->dev;
1916 if (!net_eq(dev_net(ndev), net))
1917 continue;
1918
1919 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1920 continue;
1921
1922 /* Decouple optimistic from tentative for evaluation here.
1923 * Ban optimistic addresses explicitly, when required.
1924 */
1925 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1926 ? (ifp->flags&~IFA_F_TENTATIVE)
1927 : ifp->flags;
1928 if (ipv6_addr_equal(&ifp->addr, addr) &&
1929 !(ifp_flags&banned_flags) &&
1930 (!dev || ndev == dev ||
1931 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1932 rcu_read_unlock();
1933 return ndev;
1934 }
1935 }
1936
1937 rcu_read_unlock();
1938 return NULL;
1939 }
1940
1941 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1942 const struct net_device *dev, bool skip_dev_check,
1943 int strict, u32 banned_flags)
1944 {
1945 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1946 strict, banned_flags) ? 1 : 0;
1947 }
1948 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1949
1950
1951 /* Compares an address/prefix_len with addresses on device @dev.
1952 * If one is found it returns true.
1953 */
1954 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1955 const unsigned int prefix_len, struct net_device *dev)
1956 {
1957 const struct inet6_ifaddr *ifa;
1958 const struct inet6_dev *idev;
1959 bool ret = false;
1960
1961 rcu_read_lock();
1962 idev = __in6_dev_get(dev);
1963 if (idev) {
1964 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1965 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1966 if (ret)
1967 break;
1968 }
1969 }
1970 rcu_read_unlock();
1971
1972 return ret;
1973 }
1974 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1975
1976 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1977 {
1978 const struct inet6_ifaddr *ifa;
1979 const struct inet6_dev *idev;
1980 int onlink;
1981
1982 onlink = 0;
1983 rcu_read_lock();
1984 idev = __in6_dev_get(dev);
1985 if (idev) {
1986 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1987 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1988 ifa->prefix_len);
1989 if (onlink)
1990 break;
1991 }
1992 }
1993 rcu_read_unlock();
1994 return onlink;
1995 }
1996 EXPORT_SYMBOL(ipv6_chk_prefix);
1997
1998 /**
1999 * ipv6_dev_find - find the first device with a given source address.
2000 * @net: the net namespace
2001 * @addr: the source address
2002 * @dev: used to find the L3 domain of interest
2003 *
2004 * The caller should be protected by RCU, or RTNL.
2005 */
2006 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2007 struct net_device *dev)
2008 {
2009 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2010 IFA_F_TENTATIVE);
2011 }
2012 EXPORT_SYMBOL(ipv6_dev_find);
2013
2014 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2015 struct net_device *dev, int strict)
2016 {
2017 unsigned int hash = inet6_addr_hash(net, addr);
2018 struct inet6_ifaddr *ifp, *result = NULL;
2019
2020 rcu_read_lock();
2021 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2022 if (!net_eq(dev_net(ifp->idev->dev), net))
2023 continue;
2024 if (ipv6_addr_equal(&ifp->addr, addr)) {
2025 if (!dev || ifp->idev->dev == dev ||
2026 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2027 result = ifp;
2028 in6_ifa_hold(ifp);
2029 break;
2030 }
2031 }
2032 }
2033 rcu_read_unlock();
2034
2035 return result;
2036 }
2037
2038 /* Gets referenced address, destroys ifaddr */
2039
2040 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2041 {
2042 if (dad_failed)
2043 ifp->flags |= IFA_F_DADFAILED;
2044
2045 if (ifp->flags&IFA_F_TEMPORARY) {
2046 struct inet6_ifaddr *ifpub;
2047 spin_lock_bh(&ifp->lock);
2048 ifpub = ifp->ifpub;
2049 if (ifpub) {
2050 in6_ifa_hold(ifpub);
2051 spin_unlock_bh(&ifp->lock);
2052 ipv6_create_tempaddr(ifpub, true);
2053 in6_ifa_put(ifpub);
2054 } else {
2055 spin_unlock_bh(&ifp->lock);
2056 }
2057 ipv6_del_addr(ifp);
2058 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2059 spin_lock_bh(&ifp->lock);
2060 addrconf_del_dad_work(ifp);
2061 ifp->flags |= IFA_F_TENTATIVE;
2062 if (dad_failed)
2063 ifp->flags &= ~IFA_F_OPTIMISTIC;
2064 spin_unlock_bh(&ifp->lock);
2065 if (dad_failed)
2066 ipv6_ifa_notify(0, ifp);
2067 in6_ifa_put(ifp);
2068 } else {
2069 ipv6_del_addr(ifp);
2070 }
2071 }
2072
2073 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2074 {
2075 int err = -ENOENT;
2076
2077 spin_lock_bh(&ifp->lock);
2078 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2079 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2080 err = 0;
2081 }
2082 spin_unlock_bh(&ifp->lock);
2083
2084 return err;
2085 }
2086
2087 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2088 {
2089 struct inet6_dev *idev = ifp->idev;
2090 struct net *net = dev_net(ifp->idev->dev);
2091
2092 if (addrconf_dad_end(ifp)) {
2093 in6_ifa_put(ifp);
2094 return;
2095 }
2096
2097 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2098 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2099
2100 spin_lock_bh(&ifp->lock);
2101
2102 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2103 struct in6_addr new_addr;
2104 struct inet6_ifaddr *ifp2;
2105 int retries = ifp->stable_privacy_retry + 1;
2106 struct ifa6_config cfg = {
2107 .pfx = &new_addr,
2108 .plen = ifp->prefix_len,
2109 .ifa_flags = ifp->flags,
2110 .valid_lft = ifp->valid_lft,
2111 .preferred_lft = ifp->prefered_lft,
2112 .scope = ifp->scope,
2113 };
2114
2115 if (retries > net->ipv6.sysctl.idgen_retries) {
2116 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2117 ifp->idev->dev->name);
2118 goto errdad;
2119 }
2120
2121 new_addr = ifp->addr;
2122 if (ipv6_generate_stable_address(&new_addr, retries,
2123 idev))
2124 goto errdad;
2125
2126 spin_unlock_bh(&ifp->lock);
2127
2128 if (idev->cnf.max_addresses &&
2129 ipv6_count_addresses(idev) >=
2130 idev->cnf.max_addresses)
2131 goto lock_errdad;
2132
2133 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2134 ifp->idev->dev->name);
2135
2136 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2137 if (IS_ERR(ifp2))
2138 goto lock_errdad;
2139
2140 spin_lock_bh(&ifp2->lock);
2141 ifp2->stable_privacy_retry = retries;
2142 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2143 spin_unlock_bh(&ifp2->lock);
2144
2145 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2146 in6_ifa_put(ifp2);
2147 lock_errdad:
2148 spin_lock_bh(&ifp->lock);
2149 }
2150
2151 errdad:
2152 /* transition from _POSTDAD to _ERRDAD */
2153 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2154 spin_unlock_bh(&ifp->lock);
2155
2156 addrconf_mod_dad_work(ifp, 0);
2157 in6_ifa_put(ifp);
2158 }
2159
2160 /* Join to solicited addr multicast group.
2161 * caller must hold RTNL */
2162 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2163 {
2164 struct in6_addr maddr;
2165
2166 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2167 return;
2168
2169 addrconf_addr_solict_mult(addr, &maddr);
2170 ipv6_dev_mc_inc(dev, &maddr);
2171 }
2172
2173 /* caller must hold RTNL */
2174 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2175 {
2176 struct in6_addr maddr;
2177
2178 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2179 return;
2180
2181 addrconf_addr_solict_mult(addr, &maddr);
2182 __ipv6_dev_mc_dec(idev, &maddr);
2183 }
2184
2185 /* caller must hold RTNL */
2186 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2187 {
2188 struct in6_addr addr;
2189
2190 if (ifp->prefix_len >= 127) /* RFC 6164 */
2191 return;
2192 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2193 if (ipv6_addr_any(&addr))
2194 return;
2195 __ipv6_dev_ac_inc(ifp->idev, &addr);
2196 }
2197
2198 /* caller must hold RTNL */
2199 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2200 {
2201 struct in6_addr addr;
2202
2203 if (ifp->prefix_len >= 127) /* RFC 6164 */
2204 return;
2205 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2206 if (ipv6_addr_any(&addr))
2207 return;
2208 __ipv6_dev_ac_dec(ifp->idev, &addr);
2209 }
2210
2211 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2212 {
2213 switch (dev->addr_len) {
2214 case ETH_ALEN:
2215 memcpy(eui, dev->dev_addr, 3);
2216 eui[3] = 0xFF;
2217 eui[4] = 0xFE;
2218 memcpy(eui + 5, dev->dev_addr + 3, 3);
2219 break;
2220 case EUI64_ADDR_LEN:
2221 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2222 eui[0] ^= 2;
2223 break;
2224 default:
2225 return -1;
2226 }
2227
2228 return 0;
2229 }
2230
2231 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2232 {
2233 union fwnet_hwaddr *ha;
2234
2235 if (dev->addr_len != FWNET_ALEN)
2236 return -1;
2237
2238 ha = (union fwnet_hwaddr *)dev->dev_addr;
2239
2240 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2241 eui[0] ^= 2;
2242 return 0;
2243 }
2244
2245 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2246 {
2247 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2248 if (dev->addr_len != ARCNET_ALEN)
2249 return -1;
2250 memset(eui, 0, 7);
2251 eui[7] = *(u8 *)dev->dev_addr;
2252 return 0;
2253 }
2254
2255 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2256 {
2257 if (dev->addr_len != INFINIBAND_ALEN)
2258 return -1;
2259 memcpy(eui, dev->dev_addr + 12, 8);
2260 eui[0] |= 2;
2261 return 0;
2262 }
2263
2264 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2265 {
2266 if (addr == 0)
2267 return -1;
2268 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2269 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2270 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2271 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2272 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2273 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2274 eui[1] = 0;
2275 eui[2] = 0x5E;
2276 eui[3] = 0xFE;
2277 memcpy(eui + 4, &addr, 4);
2278 return 0;
2279 }
2280
2281 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2282 {
2283 if (dev->priv_flags & IFF_ISATAP)
2284 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2285 return -1;
2286 }
2287
2288 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2289 {
2290 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2291 }
2292
2293 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2294 {
2295 memcpy(eui, dev->perm_addr, 3);
2296 memcpy(eui + 5, dev->perm_addr + 3, 3);
2297 eui[3] = 0xFF;
2298 eui[4] = 0xFE;
2299 eui[0] ^= 2;
2300 return 0;
2301 }
2302
2303 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2304 {
2305 switch (dev->type) {
2306 case ARPHRD_ETHER:
2307 case ARPHRD_FDDI:
2308 return addrconf_ifid_eui48(eui, dev);
2309 case ARPHRD_ARCNET:
2310 return addrconf_ifid_arcnet(eui, dev);
2311 case ARPHRD_INFINIBAND:
2312 return addrconf_ifid_infiniband(eui, dev);
2313 case ARPHRD_SIT:
2314 return addrconf_ifid_sit(eui, dev);
2315 case ARPHRD_IPGRE:
2316 case ARPHRD_TUNNEL:
2317 return addrconf_ifid_gre(eui, dev);
2318 case ARPHRD_6LOWPAN:
2319 return addrconf_ifid_6lowpan(eui, dev);
2320 case ARPHRD_IEEE1394:
2321 return addrconf_ifid_ieee1394(eui, dev);
2322 case ARPHRD_TUNNEL6:
2323 case ARPHRD_IP6GRE:
2324 case ARPHRD_RAWIP:
2325 return addrconf_ifid_ip6tnl(eui, dev);
2326 }
2327 return -1;
2328 }
2329
2330 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2331 {
2332 int err = -1;
2333 struct inet6_ifaddr *ifp;
2334
2335 read_lock_bh(&idev->lock);
2336 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2337 if (ifp->scope > IFA_LINK)
2338 break;
2339 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2340 memcpy(eui, ifp->addr.s6_addr+8, 8);
2341 err = 0;
2342 break;
2343 }
2344 }
2345 read_unlock_bh(&idev->lock);
2346 return err;
2347 }
2348
2349 /* Generation of a randomized Interface Identifier
2350 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2351 */
2352
2353 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2354 {
2355 regen:
2356 get_random_bytes(&addr->s6_addr[8], 8);
2357
2358 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2359 * check if generated address is not inappropriate:
2360 *
2361 * - Reserved IPv6 Interface Identifiers
2362 * - XXX: already assigned to an address on the device
2363 */
2364
2365 /* Subnet-router anycast: 0000:0000:0000:0000 */
2366 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2367 goto regen;
2368
2369 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2370 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2371 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2372 */
2373 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2374 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2375 goto regen;
2376
2377 /* Reserved subnet anycast addresses */
2378 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2379 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2380 goto regen;
2381 }
2382
2383 /*
2384 * Add prefix route.
2385 */
2386
2387 static void
2388 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2389 struct net_device *dev, unsigned long expires,
2390 u32 flags, gfp_t gfp_flags)
2391 {
2392 struct fib6_config cfg = {
2393 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2394 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2395 .fc_ifindex = dev->ifindex,
2396 .fc_expires = expires,
2397 .fc_dst_len = plen,
2398 .fc_flags = RTF_UP | flags,
2399 .fc_nlinfo.nl_net = dev_net(dev),
2400 .fc_protocol = RTPROT_KERNEL,
2401 .fc_type = RTN_UNICAST,
2402 };
2403
2404 cfg.fc_dst = *pfx;
2405
2406 /* Prevent useless cloning on PtP SIT.
2407 This thing is done here expecting that the whole
2408 class of non-broadcast devices need not cloning.
2409 */
2410 #if IS_ENABLED(CONFIG_IPV6_SIT)
2411 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2412 cfg.fc_flags |= RTF_NONEXTHOP;
2413 #endif
2414
2415 ip6_route_add(&cfg, gfp_flags, NULL);
2416 }
2417
2418
2419 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2420 int plen,
2421 const struct net_device *dev,
2422 u32 flags, u32 noflags,
2423 bool no_gw)
2424 {
2425 struct fib6_node *fn;
2426 struct fib6_info *rt = NULL;
2427 struct fib6_table *table;
2428 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2429
2430 table = fib6_get_table(dev_net(dev), tb_id);
2431 if (!table)
2432 return NULL;
2433
2434 rcu_read_lock();
2435 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2436 if (!fn)
2437 goto out;
2438
2439 for_each_fib6_node_rt_rcu(fn) {
2440 /* prefix routes only use builtin fib6_nh */
2441 if (rt->nh)
2442 continue;
2443
2444 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2445 continue;
2446 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2447 continue;
2448 if ((rt->fib6_flags & flags) != flags)
2449 continue;
2450 if ((rt->fib6_flags & noflags) != 0)
2451 continue;
2452 if (!fib6_info_hold_safe(rt))
2453 continue;
2454 break;
2455 }
2456 out:
2457 rcu_read_unlock();
2458 return rt;
2459 }
2460
2461
2462 /* Create "default" multicast route to the interface */
2463
2464 static void addrconf_add_mroute(struct net_device *dev)
2465 {
2466 struct fib6_config cfg = {
2467 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2468 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2469 .fc_ifindex = dev->ifindex,
2470 .fc_dst_len = 8,
2471 .fc_flags = RTF_UP,
2472 .fc_type = RTN_MULTICAST,
2473 .fc_nlinfo.nl_net = dev_net(dev),
2474 .fc_protocol = RTPROT_KERNEL,
2475 };
2476
2477 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2478
2479 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2480 }
2481
2482 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2483 {
2484 struct inet6_dev *idev;
2485
2486 ASSERT_RTNL();
2487
2488 idev = ipv6_find_idev(dev);
2489 if (IS_ERR(idev))
2490 return idev;
2491
2492 if (idev->cnf.disable_ipv6)
2493 return ERR_PTR(-EACCES);
2494
2495 /* Add default multicast route */
2496 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2497 addrconf_add_mroute(dev);
2498
2499 return idev;
2500 }
2501
2502 static void manage_tempaddrs(struct inet6_dev *idev,
2503 struct inet6_ifaddr *ifp,
2504 __u32 valid_lft, __u32 prefered_lft,
2505 bool create, unsigned long now)
2506 {
2507 u32 flags;
2508 struct inet6_ifaddr *ift;
2509
2510 read_lock_bh(&idev->lock);
2511 /* update all temporary addresses in the list */
2512 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2513 int age, max_valid, max_prefered;
2514
2515 if (ifp != ift->ifpub)
2516 continue;
2517
2518 /* RFC 4941 section 3.3:
2519 * If a received option will extend the lifetime of a public
2520 * address, the lifetimes of temporary addresses should
2521 * be extended, subject to the overall constraint that no
2522 * temporary addresses should ever remain "valid" or "preferred"
2523 * for a time longer than (TEMP_VALID_LIFETIME) or
2524 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2525 */
2526 age = (now - ift->cstamp) / HZ;
2527 max_valid = idev->cnf.temp_valid_lft - age;
2528 if (max_valid < 0)
2529 max_valid = 0;
2530
2531 max_prefered = idev->cnf.temp_prefered_lft -
2532 idev->desync_factor - age;
2533 if (max_prefered < 0)
2534 max_prefered = 0;
2535
2536 if (valid_lft > max_valid)
2537 valid_lft = max_valid;
2538
2539 if (prefered_lft > max_prefered)
2540 prefered_lft = max_prefered;
2541
2542 spin_lock(&ift->lock);
2543 flags = ift->flags;
2544 ift->valid_lft = valid_lft;
2545 ift->prefered_lft = prefered_lft;
2546 ift->tstamp = now;
2547 if (prefered_lft > 0)
2548 ift->flags &= ~IFA_F_DEPRECATED;
2549
2550 spin_unlock(&ift->lock);
2551 if (!(flags&IFA_F_TENTATIVE))
2552 ipv6_ifa_notify(0, ift);
2553 }
2554
2555 if ((create || list_empty(&idev->tempaddr_list)) &&
2556 idev->cnf.use_tempaddr > 0) {
2557 /* When a new public address is created as described
2558 * in [ADDRCONF], also create a new temporary address.
2559 * Also create a temporary address if it's enabled but
2560 * no temporary address currently exists.
2561 */
2562 read_unlock_bh(&idev->lock);
2563 ipv6_create_tempaddr(ifp, false);
2564 } else {
2565 read_unlock_bh(&idev->lock);
2566 }
2567 }
2568
2569 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2570 {
2571 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2572 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2573 }
2574
2575 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2576 const struct prefix_info *pinfo,
2577 struct inet6_dev *in6_dev,
2578 const struct in6_addr *addr, int addr_type,
2579 u32 addr_flags, bool sllao, bool tokenized,
2580 __u32 valid_lft, u32 prefered_lft)
2581 {
2582 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2583 int create = 0;
2584
2585 if (!ifp && valid_lft) {
2586 int max_addresses = in6_dev->cnf.max_addresses;
2587 struct ifa6_config cfg = {
2588 .pfx = addr,
2589 .plen = pinfo->prefix_len,
2590 .ifa_flags = addr_flags,
2591 .valid_lft = valid_lft,
2592 .preferred_lft = prefered_lft,
2593 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2594 };
2595
2596 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2597 if ((net->ipv6.devconf_all->optimistic_dad ||
2598 in6_dev->cnf.optimistic_dad) &&
2599 !net->ipv6.devconf_all->forwarding && sllao)
2600 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2601 #endif
2602
2603 /* Do not allow to create too much of autoconfigured
2604 * addresses; this would be too easy way to crash kernel.
2605 */
2606 if (!max_addresses ||
2607 ipv6_count_addresses(in6_dev) < max_addresses)
2608 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2609
2610 if (IS_ERR_OR_NULL(ifp))
2611 return -1;
2612
2613 create = 1;
2614 spin_lock_bh(&ifp->lock);
2615 ifp->flags |= IFA_F_MANAGETEMPADDR;
2616 ifp->cstamp = jiffies;
2617 ifp->tokenized = tokenized;
2618 spin_unlock_bh(&ifp->lock);
2619 addrconf_dad_start(ifp);
2620 }
2621
2622 if (ifp) {
2623 u32 flags;
2624 unsigned long now;
2625 u32 stored_lft;
2626
2627 /* Update lifetime (RFC4862 5.5.3 e)
2628 * We deviate from RFC4862 by honoring all Valid Lifetimes to
2629 * improve the reaction of SLAAC to renumbering events
2630 * (draft-gont-6man-slaac-renum-06, Section 4.2)
2631 */
2632 spin_lock_bh(&ifp->lock);
2633 now = jiffies;
2634 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2635 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2636 else
2637 stored_lft = 0;
2638
2639 if (!create && stored_lft) {
2640 ifp->valid_lft = valid_lft;
2641 ifp->prefered_lft = prefered_lft;
2642 ifp->tstamp = now;
2643 flags = ifp->flags;
2644 ifp->flags &= ~IFA_F_DEPRECATED;
2645 spin_unlock_bh(&ifp->lock);
2646
2647 if (!(flags&IFA_F_TENTATIVE))
2648 ipv6_ifa_notify(0, ifp);
2649 } else
2650 spin_unlock_bh(&ifp->lock);
2651
2652 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2653 create, now);
2654
2655 in6_ifa_put(ifp);
2656 addrconf_verify();
2657 }
2658
2659 return 0;
2660 }
2661 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2662
2663 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2664 {
2665 struct prefix_info *pinfo;
2666 __u32 valid_lft;
2667 __u32 prefered_lft;
2668 int addr_type, err;
2669 u32 addr_flags = 0;
2670 struct inet6_dev *in6_dev;
2671 struct net *net = dev_net(dev);
2672
2673 pinfo = (struct prefix_info *) opt;
2674
2675 if (len < sizeof(struct prefix_info)) {
2676 netdev_dbg(dev, "addrconf: prefix option too short\n");
2677 return;
2678 }
2679
2680 /*
2681 * Validation checks ([ADDRCONF], page 19)
2682 */
2683
2684 addr_type = ipv6_addr_type(&pinfo->prefix);
2685
2686 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2687 return;
2688
2689 valid_lft = ntohl(pinfo->valid);
2690 prefered_lft = ntohl(pinfo->prefered);
2691
2692 if (prefered_lft > valid_lft) {
2693 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2694 return;
2695 }
2696
2697 in6_dev = in6_dev_get(dev);
2698
2699 if (!in6_dev) {
2700 net_dbg_ratelimited("addrconf: device %s not configured\n",
2701 dev->name);
2702 return;
2703 }
2704
2705 /*
2706 * Two things going on here:
2707 * 1) Add routes for on-link prefixes
2708 * 2) Configure prefixes with the auto flag set
2709 */
2710
2711 if (pinfo->onlink) {
2712 struct fib6_info *rt;
2713 unsigned long rt_expires;
2714
2715 /* Avoid arithmetic overflow. Really, we could
2716 * save rt_expires in seconds, likely valid_lft,
2717 * but it would require division in fib gc, that it
2718 * not good.
2719 */
2720 if (HZ > USER_HZ)
2721 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2722 else
2723 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2724
2725 if (addrconf_finite_timeout(rt_expires))
2726 rt_expires *= HZ;
2727
2728 rt = addrconf_get_prefix_route(&pinfo->prefix,
2729 pinfo->prefix_len,
2730 dev,
2731 RTF_ADDRCONF | RTF_PREFIX_RT,
2732 RTF_DEFAULT, true);
2733
2734 if (rt) {
2735 /* Autoconf prefix route */
2736 if (valid_lft == 0) {
2737 ip6_del_rt(net, rt, false);
2738 rt = NULL;
2739 } else if (addrconf_finite_timeout(rt_expires)) {
2740 /* not infinity */
2741 fib6_set_expires(rt, jiffies + rt_expires);
2742 } else {
2743 fib6_clean_expires(rt);
2744 }
2745 } else if (valid_lft) {
2746 clock_t expires = 0;
2747 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2748 if (addrconf_finite_timeout(rt_expires)) {
2749 /* not infinity */
2750 flags |= RTF_EXPIRES;
2751 expires = jiffies_to_clock_t(rt_expires);
2752 }
2753 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2754 0, dev, expires, flags,
2755 GFP_ATOMIC);
2756 }
2757 fib6_info_release(rt);
2758 }
2759
2760 /* Try to figure out our local address for this prefix */
2761
2762 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2763 struct in6_addr addr;
2764 bool tokenized = false, dev_addr_generated = false;
2765
2766 if (pinfo->prefix_len == 64) {
2767 memcpy(&addr, &pinfo->prefix, 8);
2768
2769 if (!ipv6_addr_any(&in6_dev->token)) {
2770 read_lock_bh(&in6_dev->lock);
2771 memcpy(addr.s6_addr + 8,
2772 in6_dev->token.s6_addr + 8, 8);
2773 read_unlock_bh(&in6_dev->lock);
2774 tokenized = true;
2775 } else if (is_addr_mode_generate_stable(in6_dev) &&
2776 !ipv6_generate_stable_address(&addr, 0,
2777 in6_dev)) {
2778 addr_flags |= IFA_F_STABLE_PRIVACY;
2779 goto ok;
2780 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2781 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2782 goto put;
2783 } else {
2784 dev_addr_generated = true;
2785 }
2786 goto ok;
2787 }
2788 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2789 pinfo->prefix_len);
2790 goto put;
2791
2792 ok:
2793 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2794 &addr, addr_type,
2795 addr_flags, sllao,
2796 tokenized, valid_lft,
2797 prefered_lft);
2798 if (err)
2799 goto put;
2800
2801 /* Ignore error case here because previous prefix add addr was
2802 * successful which will be notified.
2803 */
2804 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2805 addr_type, addr_flags, sllao,
2806 tokenized, valid_lft,
2807 prefered_lft,
2808 dev_addr_generated);
2809 }
2810 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2811 put:
2812 in6_dev_put(in6_dev);
2813 }
2814
2815 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2816 struct in6_ifreq *ireq)
2817 {
2818 struct ip_tunnel_parm p = { };
2819 int err;
2820
2821 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2822 return -EADDRNOTAVAIL;
2823
2824 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2825 p.iph.version = 4;
2826 p.iph.ihl = 5;
2827 p.iph.protocol = IPPROTO_IPV6;
2828 p.iph.ttl = 64;
2829
2830 if (!dev->netdev_ops->ndo_tunnel_ctl)
2831 return -EOPNOTSUPP;
2832 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2833 if (err)
2834 return err;
2835
2836 dev = __dev_get_by_name(net, p.name);
2837 if (!dev)
2838 return -ENOBUFS;
2839 return dev_open(dev, NULL);
2840 }
2841
2842 /*
2843 * Set destination address.
2844 * Special case for SIT interfaces where we create a new "virtual"
2845 * device.
2846 */
2847 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2848 {
2849 struct net_device *dev;
2850 struct in6_ifreq ireq;
2851 int err = -ENODEV;
2852
2853 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2854 return -ENODEV;
2855 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2856 return -EFAULT;
2857
2858 rtnl_lock();
2859 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2860 if (dev && dev->type == ARPHRD_SIT)
2861 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2862 rtnl_unlock();
2863 return err;
2864 }
2865
2866 static int ipv6_mc_config(struct sock *sk, bool join,
2867 const struct in6_addr *addr, int ifindex)
2868 {
2869 int ret;
2870
2871 ASSERT_RTNL();
2872
2873 lock_sock(sk);
2874 if (join)
2875 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2876 else
2877 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2878 release_sock(sk);
2879
2880 return ret;
2881 }
2882
2883 /*
2884 * Manual configuration of address on an interface
2885 */
2886 static int inet6_addr_add(struct net *net, int ifindex,
2887 struct ifa6_config *cfg,
2888 struct netlink_ext_ack *extack)
2889 {
2890 struct inet6_ifaddr *ifp;
2891 struct inet6_dev *idev;
2892 struct net_device *dev;
2893 unsigned long timeout;
2894 clock_t expires;
2895 u32 flags;
2896
2897 ASSERT_RTNL();
2898
2899 if (cfg->plen > 128)
2900 return -EINVAL;
2901
2902 /* check the lifetime */
2903 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2904 return -EINVAL;
2905
2906 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2907 return -EINVAL;
2908
2909 dev = __dev_get_by_index(net, ifindex);
2910 if (!dev)
2911 return -ENODEV;
2912
2913 idev = addrconf_add_dev(dev);
2914 if (IS_ERR(idev))
2915 return PTR_ERR(idev);
2916
2917 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2918 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2919 true, cfg->pfx, ifindex);
2920
2921 if (ret < 0)
2922 return ret;
2923 }
2924
2925 cfg->scope = ipv6_addr_scope(cfg->pfx);
2926
2927 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2928 if (addrconf_finite_timeout(timeout)) {
2929 expires = jiffies_to_clock_t(timeout * HZ);
2930 cfg->valid_lft = timeout;
2931 flags = RTF_EXPIRES;
2932 } else {
2933 expires = 0;
2934 flags = 0;
2935 cfg->ifa_flags |= IFA_F_PERMANENT;
2936 }
2937
2938 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2939 if (addrconf_finite_timeout(timeout)) {
2940 if (timeout == 0)
2941 cfg->ifa_flags |= IFA_F_DEPRECATED;
2942 cfg->preferred_lft = timeout;
2943 }
2944
2945 ifp = ipv6_add_addr(idev, cfg, true, extack);
2946 if (!IS_ERR(ifp)) {
2947 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2948 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2949 ifp->rt_priority, dev, expires,
2950 flags, GFP_KERNEL);
2951 }
2952
2953 /* Send a netlink notification if DAD is enabled and
2954 * optimistic flag is not set
2955 */
2956 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2957 ipv6_ifa_notify(0, ifp);
2958 /*
2959 * Note that section 3.1 of RFC 4429 indicates
2960 * that the Optimistic flag should not be set for
2961 * manually configured addresses
2962 */
2963 addrconf_dad_start(ifp);
2964 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2965 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2966 cfg->preferred_lft, true, jiffies);
2967 in6_ifa_put(ifp);
2968 addrconf_verify_rtnl();
2969 return 0;
2970 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2971 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2972 cfg->pfx, ifindex);
2973 }
2974
2975 return PTR_ERR(ifp);
2976 }
2977
2978 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2979 const struct in6_addr *pfx, unsigned int plen)
2980 {
2981 struct inet6_ifaddr *ifp;
2982 struct inet6_dev *idev;
2983 struct net_device *dev;
2984
2985 if (plen > 128)
2986 return -EINVAL;
2987
2988 dev = __dev_get_by_index(net, ifindex);
2989 if (!dev)
2990 return -ENODEV;
2991
2992 idev = __in6_dev_get(dev);
2993 if (!idev)
2994 return -ENXIO;
2995
2996 read_lock_bh(&idev->lock);
2997 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2998 if (ifp->prefix_len == plen &&
2999 ipv6_addr_equal(pfx, &ifp->addr)) {
3000 in6_ifa_hold(ifp);
3001 read_unlock_bh(&idev->lock);
3002
3003 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3004 (ifa_flags & IFA_F_MANAGETEMPADDR))
3005 manage_tempaddrs(idev, ifp, 0, 0, false,
3006 jiffies);
3007 ipv6_del_addr(ifp);
3008 addrconf_verify_rtnl();
3009 if (ipv6_addr_is_multicast(pfx)) {
3010 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3011 false, pfx, dev->ifindex);
3012 }
3013 return 0;
3014 }
3015 }
3016 read_unlock_bh(&idev->lock);
3017 return -EADDRNOTAVAIL;
3018 }
3019
3020
3021 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3022 {
3023 struct ifa6_config cfg = {
3024 .ifa_flags = IFA_F_PERMANENT,
3025 .preferred_lft = INFINITY_LIFE_TIME,
3026 .valid_lft = INFINITY_LIFE_TIME,
3027 };
3028 struct in6_ifreq ireq;
3029 int err;
3030
3031 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3032 return -EPERM;
3033
3034 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3035 return -EFAULT;
3036
3037 cfg.pfx = &ireq.ifr6_addr;
3038 cfg.plen = ireq.ifr6_prefixlen;
3039
3040 rtnl_lock();
3041 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3042 rtnl_unlock();
3043 return err;
3044 }
3045
3046 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3047 {
3048 struct in6_ifreq ireq;
3049 int err;
3050
3051 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3052 return -EPERM;
3053
3054 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3055 return -EFAULT;
3056
3057 rtnl_lock();
3058 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3059 ireq.ifr6_prefixlen);
3060 rtnl_unlock();
3061 return err;
3062 }
3063
3064 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3065 int plen, int scope)
3066 {
3067 struct inet6_ifaddr *ifp;
3068 struct ifa6_config cfg = {
3069 .pfx = addr,
3070 .plen = plen,
3071 .ifa_flags = IFA_F_PERMANENT,
3072 .valid_lft = INFINITY_LIFE_TIME,
3073 .preferred_lft = INFINITY_LIFE_TIME,
3074 .scope = scope
3075 };
3076
3077 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3078 if (!IS_ERR(ifp)) {
3079 spin_lock_bh(&ifp->lock);
3080 ifp->flags &= ~IFA_F_TENTATIVE;
3081 spin_unlock_bh(&ifp->lock);
3082 rt_genid_bump_ipv6(dev_net(idev->dev));
3083 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3084 in6_ifa_put(ifp);
3085 }
3086 }
3087
3088 #if IS_ENABLED(CONFIG_IPV6_SIT)
3089 static void sit_add_v4_addrs(struct inet6_dev *idev)
3090 {
3091 struct in6_addr addr;
3092 struct net_device *dev;
3093 struct net *net = dev_net(idev->dev);
3094 int scope, plen;
3095 u32 pflags = 0;
3096
3097 ASSERT_RTNL();
3098
3099 memset(&addr, 0, sizeof(struct in6_addr));
3100 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3101
3102 if (idev->dev->flags&IFF_POINTOPOINT) {
3103 addr.s6_addr32[0] = htonl(0xfe800000);
3104 scope = IFA_LINK;
3105 plen = 64;
3106 } else {
3107 scope = IPV6_ADDR_COMPATv4;
3108 plen = 96;
3109 pflags |= RTF_NONEXTHOP;
3110 }
3111
3112 if (addr.s6_addr32[3]) {
3113 add_addr(idev, &addr, plen, scope);
3114 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3115 GFP_KERNEL);
3116 return;
3117 }
3118
3119 for_each_netdev(net, dev) {
3120 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3121 if (in_dev && (dev->flags & IFF_UP)) {
3122 struct in_ifaddr *ifa;
3123 int flag = scope;
3124
3125 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3126 addr.s6_addr32[3] = ifa->ifa_local;
3127
3128 if (ifa->ifa_scope == RT_SCOPE_LINK)
3129 continue;
3130 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3131 if (idev->dev->flags&IFF_POINTOPOINT)
3132 continue;
3133 flag |= IFA_HOST;
3134 }
3135
3136 add_addr(idev, &addr, plen, flag);
3137 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3138 0, pflags, GFP_KERNEL);
3139 }
3140 }
3141 }
3142 }
3143 #endif
3144
3145 static void init_loopback(struct net_device *dev)
3146 {
3147 struct inet6_dev *idev;
3148
3149 /* ::1 */
3150
3151 ASSERT_RTNL();
3152
3153 idev = ipv6_find_idev(dev);
3154 if (IS_ERR(idev)) {
3155 pr_debug("%s: add_dev failed\n", __func__);
3156 return;
3157 }
3158
3159 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3160 }
3161
3162 void addrconf_add_linklocal(struct inet6_dev *idev,
3163 const struct in6_addr *addr, u32 flags)
3164 {
3165 struct ifa6_config cfg = {
3166 .pfx = addr,
3167 .plen = 64,
3168 .ifa_flags = flags | IFA_F_PERMANENT,
3169 .valid_lft = INFINITY_LIFE_TIME,
3170 .preferred_lft = INFINITY_LIFE_TIME,
3171 .scope = IFA_LINK
3172 };
3173 struct inet6_ifaddr *ifp;
3174
3175 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3176 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3177 idev->cnf.optimistic_dad) &&
3178 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3179 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3180 #endif
3181
3182 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3183 if (!IS_ERR(ifp)) {
3184 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3185 0, 0, GFP_ATOMIC);
3186 addrconf_dad_start(ifp);
3187 in6_ifa_put(ifp);
3188 }
3189 }
3190 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3191
3192 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3193 {
3194 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3195 return true;
3196
3197 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3198 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3199 return true;
3200
3201 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3202 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3203 return true;
3204
3205 return false;
3206 }
3207
3208 static int ipv6_generate_stable_address(struct in6_addr *address,
3209 u8 dad_count,
3210 const struct inet6_dev *idev)
3211 {
3212 static DEFINE_SPINLOCK(lock);
3213 static __u32 digest[SHA1_DIGEST_WORDS];
3214 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3215
3216 static union {
3217 char __data[SHA1_BLOCK_SIZE];
3218 struct {
3219 struct in6_addr secret;
3220 __be32 prefix[2];
3221 unsigned char hwaddr[MAX_ADDR_LEN];
3222 u8 dad_count;
3223 } __packed;
3224 } data;
3225
3226 struct in6_addr secret;
3227 struct in6_addr temp;
3228 struct net *net = dev_net(idev->dev);
3229
3230 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3231
3232 if (idev->cnf.stable_secret.initialized)
3233 secret = idev->cnf.stable_secret.secret;
3234 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3235 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3236 else
3237 return -1;
3238
3239 retry:
3240 spin_lock_bh(&lock);
3241
3242 sha1_init(digest);
3243 memset(&data, 0, sizeof(data));
3244 memset(workspace, 0, sizeof(workspace));
3245 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3246 data.prefix[0] = address->s6_addr32[0];
3247 data.prefix[1] = address->s6_addr32[1];
3248 data.secret = secret;
3249 data.dad_count = dad_count;
3250
3251 sha1_transform(digest, data.__data, workspace);
3252
3253 temp = *address;
3254 temp.s6_addr32[2] = (__force __be32)digest[0];
3255 temp.s6_addr32[3] = (__force __be32)digest[1];
3256
3257 spin_unlock_bh(&lock);
3258
3259 if (ipv6_reserved_interfaceid(temp)) {
3260 dad_count++;
3261 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3262 return -1;
3263 goto retry;
3264 }
3265
3266 *address = temp;
3267 return 0;
3268 }
3269
3270 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3271 {
3272 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3273
3274 if (s->initialized)
3275 return;
3276 s = &idev->cnf.stable_secret;
3277 get_random_bytes(&s->secret, sizeof(s->secret));
3278 s->initialized = true;
3279 }
3280
3281 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3282 {
3283 struct in6_addr addr;
3284
3285 /* no link local addresses on L3 master devices */
3286 if (netif_is_l3_master(idev->dev))
3287 return;
3288
3289 /* no link local addresses on devices flagged as slaves */
3290 if (idev->dev->flags & IFF_SLAVE)
3291 return;
3292
3293 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3294
3295 switch (idev->cnf.addr_gen_mode) {
3296 case IN6_ADDR_GEN_MODE_RANDOM:
3297 ipv6_gen_mode_random_init(idev);
3298 fallthrough;
3299 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3300 if (!ipv6_generate_stable_address(&addr, 0, idev))
3301 addrconf_add_linklocal(idev, &addr,
3302 IFA_F_STABLE_PRIVACY);
3303 else if (prefix_route)
3304 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3305 0, 0, GFP_KERNEL);
3306 break;
3307 case IN6_ADDR_GEN_MODE_EUI64:
3308 /* addrconf_add_linklocal also adds a prefix_route and we
3309 * only need to care about prefix routes if ipv6_generate_eui64
3310 * couldn't generate one.
3311 */
3312 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3313 addrconf_add_linklocal(idev, &addr, 0);
3314 else if (prefix_route)
3315 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3316 0, 0, GFP_KERNEL);
3317 break;
3318 case IN6_ADDR_GEN_MODE_NONE:
3319 default:
3320 /* will not add any link local address */
3321 break;
3322 }
3323 }
3324
3325 static void addrconf_dev_config(struct net_device *dev)
3326 {
3327 struct inet6_dev *idev;
3328
3329 ASSERT_RTNL();
3330
3331 if ((dev->type != ARPHRD_ETHER) &&
3332 (dev->type != ARPHRD_FDDI) &&
3333 (dev->type != ARPHRD_ARCNET) &&
3334 (dev->type != ARPHRD_INFINIBAND) &&
3335 (dev->type != ARPHRD_IEEE1394) &&
3336 (dev->type != ARPHRD_TUNNEL6) &&
3337 (dev->type != ARPHRD_6LOWPAN) &&
3338 (dev->type != ARPHRD_IP6GRE) &&
3339 (dev->type != ARPHRD_IPGRE) &&
3340 (dev->type != ARPHRD_TUNNEL) &&
3341 (dev->type != ARPHRD_NONE) &&
3342 (dev->type != ARPHRD_RAWIP)) {
3343 /* Alas, we support only Ethernet autoconfiguration. */
3344 idev = __in6_dev_get(dev);
3345 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3346 dev->flags & IFF_MULTICAST)
3347 ipv6_mc_up(idev);
3348 return;
3349 }
3350
3351 idev = addrconf_add_dev(dev);
3352 if (IS_ERR(idev))
3353 return;
3354
3355 /* this device type has no EUI support */
3356 if (dev->type == ARPHRD_NONE &&
3357 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3358 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3359
3360 addrconf_addr_gen(idev, false);
3361 }
3362
3363 #if IS_ENABLED(CONFIG_IPV6_SIT)
3364 static void addrconf_sit_config(struct net_device *dev)
3365 {
3366 struct inet6_dev *idev;
3367
3368 ASSERT_RTNL();
3369
3370 /*
3371 * Configure the tunnel with one of our IPv4
3372 * addresses... we should configure all of
3373 * our v4 addrs in the tunnel
3374 */
3375
3376 idev = ipv6_find_idev(dev);
3377 if (IS_ERR(idev)) {
3378 pr_debug("%s: add_dev failed\n", __func__);
3379 return;
3380 }
3381
3382 if (dev->priv_flags & IFF_ISATAP) {
3383 addrconf_addr_gen(idev, false);
3384 return;
3385 }
3386
3387 sit_add_v4_addrs(idev);
3388
3389 if (dev->flags&IFF_POINTOPOINT)
3390 addrconf_add_mroute(dev);
3391 }
3392 #endif
3393
3394 #if IS_ENABLED(CONFIG_NET_IPGRE)
3395 static void addrconf_gre_config(struct net_device *dev)
3396 {
3397 struct inet6_dev *idev;
3398
3399 ASSERT_RTNL();
3400
3401 idev = ipv6_find_idev(dev);
3402 if (IS_ERR(idev)) {
3403 pr_debug("%s: add_dev failed\n", __func__);
3404 return;
3405 }
3406
3407 addrconf_addr_gen(idev, true);
3408 if (dev->flags & IFF_POINTOPOINT)
3409 addrconf_add_mroute(dev);
3410 }
3411 #endif
3412
3413 static int fixup_permanent_addr(struct net *net,
3414 struct inet6_dev *idev,
3415 struct inet6_ifaddr *ifp)
3416 {
3417 /* !fib6_node means the host route was removed from the
3418 * FIB, for example, if 'lo' device is taken down. In that
3419 * case regenerate the host route.
3420 */
3421 if (!ifp->rt || !ifp->rt->fib6_node) {
3422 struct fib6_info *f6i, *prev;
3423
3424 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3425 GFP_ATOMIC);
3426 if (IS_ERR(f6i))
3427 return PTR_ERR(f6i);
3428
3429 /* ifp->rt can be accessed outside of rtnl */
3430 spin_lock(&ifp->lock);
3431 prev = ifp->rt;
3432 ifp->rt = f6i;
3433 spin_unlock(&ifp->lock);
3434
3435 fib6_info_release(prev);
3436 }
3437
3438 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3439 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3440 ifp->rt_priority, idev->dev, 0, 0,
3441 GFP_ATOMIC);
3442 }
3443
3444 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3445 addrconf_dad_start(ifp);
3446
3447 return 0;
3448 }
3449
3450 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3451 {
3452 struct inet6_ifaddr *ifp, *tmp;
3453 struct inet6_dev *idev;
3454
3455 idev = __in6_dev_get(dev);
3456 if (!idev)
3457 return;
3458
3459 write_lock_bh(&idev->lock);
3460
3461 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3462 if ((ifp->flags & IFA_F_PERMANENT) &&
3463 fixup_permanent_addr(net, idev, ifp) < 0) {
3464 write_unlock_bh(&idev->lock);
3465 in6_ifa_hold(ifp);
3466 ipv6_del_addr(ifp);
3467 write_lock_bh(&idev->lock);
3468
3469 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3470 idev->dev->name, &ifp->addr);
3471 }
3472 }
3473
3474 write_unlock_bh(&idev->lock);
3475 }
3476
3477 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3478 void *ptr)
3479 {
3480 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3481 struct netdev_notifier_change_info *change_info;
3482 struct netdev_notifier_changeupper_info *info;
3483 struct inet6_dev *idev = __in6_dev_get(dev);
3484 struct net *net = dev_net(dev);
3485 int run_pending = 0;
3486 int err;
3487
3488 switch (event) {
3489 case NETDEV_REGISTER:
3490 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3491 idev = ipv6_add_dev(dev);
3492 if (IS_ERR(idev))
3493 return notifier_from_errno(PTR_ERR(idev));
3494 }
3495 break;
3496
3497 case NETDEV_CHANGEMTU:
3498 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3499 if (dev->mtu < IPV6_MIN_MTU) {
3500 addrconf_ifdown(dev, dev != net->loopback_dev);
3501 break;
3502 }
3503
3504 if (idev) {
3505 rt6_mtu_change(dev, dev->mtu);
3506 idev->cnf.mtu6 = dev->mtu;
3507 break;
3508 }
3509
3510 /* allocate new idev */
3511 idev = ipv6_add_dev(dev);
3512 if (IS_ERR(idev))
3513 break;
3514
3515 /* device is still not ready */
3516 if (!(idev->if_flags & IF_READY))
3517 break;
3518
3519 run_pending = 1;
3520 fallthrough;
3521 case NETDEV_UP:
3522 case NETDEV_CHANGE:
3523 if (dev->flags & IFF_SLAVE)
3524 break;
3525
3526 if (idev && idev->cnf.disable_ipv6)
3527 break;
3528
3529 if (event == NETDEV_UP) {
3530 /* restore routes for permanent addresses */
3531 addrconf_permanent_addr(net, dev);
3532
3533 if (!addrconf_link_ready(dev)) {
3534 /* device is not ready yet. */
3535 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3536 dev->name);
3537 break;
3538 }
3539
3540 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3541 idev = ipv6_add_dev(dev);
3542
3543 if (!IS_ERR_OR_NULL(idev)) {
3544 idev->if_flags |= IF_READY;
3545 run_pending = 1;
3546 }
3547 } else if (event == NETDEV_CHANGE) {
3548 if (!addrconf_link_ready(dev)) {
3549 /* device is still not ready. */
3550 rt6_sync_down_dev(dev, event);
3551 break;
3552 }
3553
3554 if (!IS_ERR_OR_NULL(idev)) {
3555 if (idev->if_flags & IF_READY) {
3556 /* device is already configured -
3557 * but resend MLD reports, we might
3558 * have roamed and need to update
3559 * multicast snooping switches
3560 */
3561 ipv6_mc_up(idev);
3562 change_info = ptr;
3563 if (change_info->flags_changed & IFF_NOARP)
3564 addrconf_dad_run(idev, true);
3565 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3566 break;
3567 }
3568 idev->if_flags |= IF_READY;
3569 }
3570
3571 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3572 dev->name);
3573
3574 run_pending = 1;
3575 }
3576
3577 switch (dev->type) {
3578 #if IS_ENABLED(CONFIG_IPV6_SIT)
3579 case ARPHRD_SIT:
3580 addrconf_sit_config(dev);
3581 break;
3582 #endif
3583 #if IS_ENABLED(CONFIG_NET_IPGRE)
3584 case ARPHRD_IPGRE:
3585 addrconf_gre_config(dev);
3586 break;
3587 #endif
3588 case ARPHRD_LOOPBACK:
3589 init_loopback(dev);
3590 break;
3591
3592 default:
3593 addrconf_dev_config(dev);
3594 break;
3595 }
3596
3597 if (!IS_ERR_OR_NULL(idev)) {
3598 if (run_pending)
3599 addrconf_dad_run(idev, false);
3600
3601 /* Device has an address by now */
3602 rt6_sync_up(dev, RTNH_F_DEAD);
3603
3604 /*
3605 * If the MTU changed during the interface down,
3606 * when the interface up, the changed MTU must be
3607 * reflected in the idev as well as routers.
3608 */
3609 if (idev->cnf.mtu6 != dev->mtu &&
3610 dev->mtu >= IPV6_MIN_MTU) {
3611 rt6_mtu_change(dev, dev->mtu);
3612 idev->cnf.mtu6 = dev->mtu;
3613 }
3614 idev->tstamp = jiffies;
3615 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3616
3617 /*
3618 * If the changed mtu during down is lower than
3619 * IPV6_MIN_MTU stop IPv6 on this interface.
3620 */
3621 if (dev->mtu < IPV6_MIN_MTU)
3622 addrconf_ifdown(dev, dev != net->loopback_dev);
3623 }
3624 break;
3625
3626 case NETDEV_DOWN:
3627 case NETDEV_UNREGISTER:
3628 /*
3629 * Remove all addresses from this interface.
3630 */
3631 addrconf_ifdown(dev, event != NETDEV_DOWN);
3632 break;
3633
3634 case NETDEV_CHANGENAME:
3635 if (idev) {
3636 snmp6_unregister_dev(idev);
3637 addrconf_sysctl_unregister(idev);
3638 err = addrconf_sysctl_register(idev);
3639 if (err)
3640 return notifier_from_errno(err);
3641 err = snmp6_register_dev(idev);
3642 if (err) {
3643 addrconf_sysctl_unregister(idev);
3644 return notifier_from_errno(err);
3645 }
3646 }
3647 break;
3648
3649 case NETDEV_PRE_TYPE_CHANGE:
3650 case NETDEV_POST_TYPE_CHANGE:
3651 if (idev)
3652 addrconf_type_change(dev, event);
3653 break;
3654
3655 case NETDEV_CHANGEUPPER:
3656 info = ptr;
3657
3658 /* flush all routes if dev is linked to or unlinked from
3659 * an L3 master device (e.g., VRF)
3660 */
3661 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3662 addrconf_ifdown(dev, false);
3663 }
3664
3665 return NOTIFY_OK;
3666 }
3667
3668 /*
3669 * addrconf module should be notified of a device going up
3670 */
3671 static struct notifier_block ipv6_dev_notf = {
3672 .notifier_call = addrconf_notify,
3673 .priority = ADDRCONF_NOTIFY_PRIORITY,
3674 };
3675
3676 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3677 {
3678 struct inet6_dev *idev;
3679 ASSERT_RTNL();
3680
3681 idev = __in6_dev_get(dev);
3682
3683 if (event == NETDEV_POST_TYPE_CHANGE)
3684 ipv6_mc_remap(idev);
3685 else if (event == NETDEV_PRE_TYPE_CHANGE)
3686 ipv6_mc_unmap(idev);
3687 }
3688
3689 static bool addr_is_local(const struct in6_addr *addr)
3690 {
3691 return ipv6_addr_type(addr) &
3692 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3693 }
3694
3695 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3696 {
3697 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3698 struct net *net = dev_net(dev);
3699 struct inet6_dev *idev;
3700 struct inet6_ifaddr *ifa, *tmp;
3701 bool keep_addr = false;
3702 int state, i;
3703
3704 ASSERT_RTNL();
3705
3706 rt6_disable_ip(dev, event);
3707
3708 idev = __in6_dev_get(dev);
3709 if (!idev)
3710 return -ENODEV;
3711
3712 /*
3713 * Step 1: remove reference to ipv6 device from parent device.
3714 * Do not dev_put!
3715 */
3716 if (unregister) {
3717 idev->dead = 1;
3718
3719 /* protected by rtnl_lock */
3720 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3721
3722 /* Step 1.5: remove snmp6 entry */
3723 snmp6_unregister_dev(idev);
3724
3725 }
3726
3727 /* combine the user config with event to determine if permanent
3728 * addresses are to be removed from address hash table
3729 */
3730 if (!unregister && !idev->cnf.disable_ipv6) {
3731 /* aggregate the system setting and interface setting */
3732 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3733
3734 if (!_keep_addr)
3735 _keep_addr = idev->cnf.keep_addr_on_down;
3736
3737 keep_addr = (_keep_addr > 0);
3738 }
3739
3740 /* Step 2: clear hash table */
3741 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3742 struct hlist_head *h = &inet6_addr_lst[i];
3743
3744 spin_lock_bh(&addrconf_hash_lock);
3745 restart:
3746 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3747 if (ifa->idev == idev) {
3748 addrconf_del_dad_work(ifa);
3749 /* combined flag + permanent flag decide if
3750 * address is retained on a down event
3751 */
3752 if (!keep_addr ||
3753 !(ifa->flags & IFA_F_PERMANENT) ||
3754 addr_is_local(&ifa->addr)) {
3755 hlist_del_init_rcu(&ifa->addr_lst);
3756 goto restart;
3757 }
3758 }
3759 }
3760 spin_unlock_bh(&addrconf_hash_lock);
3761 }
3762
3763 write_lock_bh(&idev->lock);
3764
3765 addrconf_del_rs_timer(idev);
3766
3767 /* Step 2: clear flags for stateless addrconf */
3768 if (!unregister)
3769 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3770
3771 /* Step 3: clear tempaddr list */
3772 while (!list_empty(&idev->tempaddr_list)) {
3773 ifa = list_first_entry(&idev->tempaddr_list,
3774 struct inet6_ifaddr, tmp_list);
3775 list_del(&ifa->tmp_list);
3776 write_unlock_bh(&idev->lock);
3777 spin_lock_bh(&ifa->lock);
3778
3779 if (ifa->ifpub) {
3780 in6_ifa_put(ifa->ifpub);
3781 ifa->ifpub = NULL;
3782 }
3783 spin_unlock_bh(&ifa->lock);
3784 in6_ifa_put(ifa);
3785 write_lock_bh(&idev->lock);
3786 }
3787
3788 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3789 struct fib6_info *rt = NULL;
3790 bool keep;
3791
3792 addrconf_del_dad_work(ifa);
3793
3794 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3795 !addr_is_local(&ifa->addr);
3796
3797 write_unlock_bh(&idev->lock);
3798 spin_lock_bh(&ifa->lock);
3799
3800 if (keep) {
3801 /* set state to skip the notifier below */
3802 state = INET6_IFADDR_STATE_DEAD;
3803 ifa->state = INET6_IFADDR_STATE_PREDAD;
3804 if (!(ifa->flags & IFA_F_NODAD))
3805 ifa->flags |= IFA_F_TENTATIVE;
3806
3807 rt = ifa->rt;
3808 ifa->rt = NULL;
3809 } else {
3810 state = ifa->state;
3811 ifa->state = INET6_IFADDR_STATE_DEAD;
3812 }
3813
3814 spin_unlock_bh(&ifa->lock);
3815
3816 if (rt)
3817 ip6_del_rt(net, rt, false);
3818
3819 if (state != INET6_IFADDR_STATE_DEAD) {
3820 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3821 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3822 } else {
3823 if (idev->cnf.forwarding)
3824 addrconf_leave_anycast(ifa);
3825 addrconf_leave_solict(ifa->idev, &ifa->addr);
3826 }
3827
3828 write_lock_bh(&idev->lock);
3829 if (!keep) {
3830 list_del_rcu(&ifa->if_list);
3831 in6_ifa_put(ifa);
3832 }
3833 }
3834
3835 write_unlock_bh(&idev->lock);
3836
3837 /* Step 5: Discard anycast and multicast list */
3838 if (unregister) {
3839 ipv6_ac_destroy_dev(idev);
3840 ipv6_mc_destroy_dev(idev);
3841 } else {
3842 ipv6_mc_down(idev);
3843 }
3844
3845 idev->tstamp = jiffies;
3846
3847 /* Last: Shot the device (if unregistered) */
3848 if (unregister) {
3849 addrconf_sysctl_unregister(idev);
3850 neigh_parms_release(&nd_tbl, idev->nd_parms);
3851 neigh_ifdown(&nd_tbl, dev);
3852 in6_dev_put(idev);
3853 }
3854 return 0;
3855 }
3856
3857 static void addrconf_rs_timer(struct timer_list *t)
3858 {
3859 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3860 struct net_device *dev = idev->dev;
3861 struct in6_addr lladdr;
3862
3863 write_lock(&idev->lock);
3864 if (idev->dead || !(idev->if_flags & IF_READY))
3865 goto out;
3866
3867 if (!ipv6_accept_ra(idev))
3868 goto out;
3869
3870 /* Announcement received after solicitation was sent */
3871 if (idev->if_flags & IF_RA_RCVD)
3872 goto out;
3873
3874 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3875 write_unlock(&idev->lock);
3876 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3877 ndisc_send_rs(dev, &lladdr,
3878 &in6addr_linklocal_allrouters);
3879 else
3880 goto put;
3881
3882 write_lock(&idev->lock);
3883 idev->rs_interval = rfc3315_s14_backoff_update(
3884 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3885 /* The wait after the last probe can be shorter */
3886 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3887 idev->cnf.rtr_solicits) ?
3888 idev->cnf.rtr_solicit_delay :
3889 idev->rs_interval);
3890 } else {
3891 /*
3892 * Note: we do not support deprecated "all on-link"
3893 * assumption any longer.
3894 */
3895 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3896 }
3897
3898 out:
3899 write_unlock(&idev->lock);
3900 put:
3901 in6_dev_put(idev);
3902 }
3903
3904 /*
3905 * Duplicate Address Detection
3906 */
3907 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3908 {
3909 unsigned long rand_num;
3910 struct inet6_dev *idev = ifp->idev;
3911 u64 nonce;
3912
3913 if (ifp->flags & IFA_F_OPTIMISTIC)
3914 rand_num = 0;
3915 else
3916 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3917
3918 nonce = 0;
3919 if (idev->cnf.enhanced_dad ||
3920 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3921 do
3922 get_random_bytes(&nonce, 6);
3923 while (nonce == 0);
3924 }
3925 ifp->dad_nonce = nonce;
3926 ifp->dad_probes = idev->cnf.dad_transmits;
3927 addrconf_mod_dad_work(ifp, rand_num);
3928 }
3929
3930 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3931 {
3932 struct inet6_dev *idev = ifp->idev;
3933 struct net_device *dev = idev->dev;
3934 bool bump_id, notify = false;
3935 struct net *net;
3936
3937 addrconf_join_solict(dev, &ifp->addr);
3938
3939 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3940
3941 read_lock_bh(&idev->lock);
3942 spin_lock(&ifp->lock);
3943 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3944 goto out;
3945
3946 net = dev_net(dev);
3947 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3948 (net->ipv6.devconf_all->accept_dad < 1 &&
3949 idev->cnf.accept_dad < 1) ||
3950 !(ifp->flags&IFA_F_TENTATIVE) ||
3951 ifp->flags & IFA_F_NODAD) {
3952 bool send_na = false;
3953
3954 if (ifp->flags & IFA_F_TENTATIVE &&
3955 !(ifp->flags & IFA_F_OPTIMISTIC))
3956 send_na = true;
3957 bump_id = ifp->flags & IFA_F_TENTATIVE;
3958 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3959 spin_unlock(&ifp->lock);
3960 read_unlock_bh(&idev->lock);
3961
3962 addrconf_dad_completed(ifp, bump_id, send_na);
3963 return;
3964 }
3965
3966 if (!(idev->if_flags & IF_READY)) {
3967 spin_unlock(&ifp->lock);
3968 read_unlock_bh(&idev->lock);
3969 /*
3970 * If the device is not ready:
3971 * - keep it tentative if it is a permanent address.
3972 * - otherwise, kill it.
3973 */
3974 in6_ifa_hold(ifp);
3975 addrconf_dad_stop(ifp, 0);
3976 return;
3977 }
3978
3979 /*
3980 * Optimistic nodes can start receiving
3981 * Frames right away
3982 */
3983 if (ifp->flags & IFA_F_OPTIMISTIC) {
3984 ip6_ins_rt(net, ifp->rt);
3985 if (ipv6_use_optimistic_addr(net, idev)) {
3986 /* Because optimistic nodes can use this address,
3987 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3988 */
3989 notify = true;
3990 }
3991 }
3992
3993 addrconf_dad_kick(ifp);
3994 out:
3995 spin_unlock(&ifp->lock);
3996 read_unlock_bh(&idev->lock);
3997 if (notify)
3998 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3999 }
4000
4001 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4002 {
4003 bool begin_dad = false;
4004
4005 spin_lock_bh(&ifp->lock);
4006 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4007 ifp->state = INET6_IFADDR_STATE_PREDAD;
4008 begin_dad = true;
4009 }
4010 spin_unlock_bh(&ifp->lock);
4011
4012 if (begin_dad)
4013 addrconf_mod_dad_work(ifp, 0);
4014 }
4015
4016 static void addrconf_dad_work(struct work_struct *w)
4017 {
4018 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4019 struct inet6_ifaddr,
4020 dad_work);
4021 struct inet6_dev *idev = ifp->idev;
4022 bool bump_id, disable_ipv6 = false;
4023 struct in6_addr mcaddr;
4024
4025 enum {
4026 DAD_PROCESS,
4027 DAD_BEGIN,
4028 DAD_ABORT,
4029 } action = DAD_PROCESS;
4030
4031 rtnl_lock();
4032
4033 spin_lock_bh(&ifp->lock);
4034 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4035 action = DAD_BEGIN;
4036 ifp->state = INET6_IFADDR_STATE_DAD;
4037 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4038 action = DAD_ABORT;
4039 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4040
4041 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4042 idev->cnf.accept_dad > 1) &&
4043 !idev->cnf.disable_ipv6 &&
4044 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4045 struct in6_addr addr;
4046
4047 addr.s6_addr32[0] = htonl(0xfe800000);
4048 addr.s6_addr32[1] = 0;
4049
4050 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4051 ipv6_addr_equal(&ifp->addr, &addr)) {
4052 /* DAD failed for link-local based on MAC */
4053 idev->cnf.disable_ipv6 = 1;
4054
4055 pr_info("%s: IPv6 being disabled!\n",
4056 ifp->idev->dev->name);
4057 disable_ipv6 = true;
4058 }
4059 }
4060 }
4061 spin_unlock_bh(&ifp->lock);
4062
4063 if (action == DAD_BEGIN) {
4064 addrconf_dad_begin(ifp);
4065 goto out;
4066 } else if (action == DAD_ABORT) {
4067 in6_ifa_hold(ifp);
4068 addrconf_dad_stop(ifp, 1);
4069 if (disable_ipv6)
4070 addrconf_ifdown(idev->dev, false);
4071 goto out;
4072 }
4073
4074 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4075 goto out;
4076
4077 write_lock_bh(&idev->lock);
4078 if (idev->dead || !(idev->if_flags & IF_READY)) {
4079 write_unlock_bh(&idev->lock);
4080 goto out;
4081 }
4082
4083 spin_lock(&ifp->lock);
4084 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4085 spin_unlock(&ifp->lock);
4086 write_unlock_bh(&idev->lock);
4087 goto out;
4088 }
4089
4090 if (ifp->dad_probes == 0) {
4091 bool send_na = false;
4092
4093 /*
4094 * DAD was successful
4095 */
4096
4097 if (ifp->flags & IFA_F_TENTATIVE &&
4098 !(ifp->flags & IFA_F_OPTIMISTIC))
4099 send_na = true;
4100 bump_id = ifp->flags & IFA_F_TENTATIVE;
4101 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4102 spin_unlock(&ifp->lock);
4103 write_unlock_bh(&idev->lock);
4104
4105 addrconf_dad_completed(ifp, bump_id, send_na);
4106
4107 goto out;
4108 }
4109
4110 ifp->dad_probes--;
4111 addrconf_mod_dad_work(ifp,
4112 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4113 HZ/100));
4114 spin_unlock(&ifp->lock);
4115 write_unlock_bh(&idev->lock);
4116
4117 /* send a neighbour solicitation for our addr */
4118 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4119 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4120 ifp->dad_nonce);
4121 out:
4122 in6_ifa_put(ifp);
4123 rtnl_unlock();
4124 }
4125
4126 /* ifp->idev must be at least read locked */
4127 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4128 {
4129 struct inet6_ifaddr *ifpiter;
4130 struct inet6_dev *idev = ifp->idev;
4131
4132 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4133 if (ifpiter->scope > IFA_LINK)
4134 break;
4135 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4136 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4137 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4138 IFA_F_PERMANENT)
4139 return false;
4140 }
4141 return true;
4142 }
4143
4144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4145 bool send_na)
4146 {
4147 struct net_device *dev = ifp->idev->dev;
4148 struct in6_addr lladdr;
4149 bool send_rs, send_mld;
4150
4151 addrconf_del_dad_work(ifp);
4152
4153 /*
4154 * Configure the address for reception. Now it is valid.
4155 */
4156
4157 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4158
4159 /* If added prefix is link local and we are prepared to process
4160 router advertisements, start sending router solicitations.
4161 */
4162
4163 read_lock_bh(&ifp->idev->lock);
4164 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4165 send_rs = send_mld &&
4166 ipv6_accept_ra(ifp->idev) &&
4167 ifp->idev->cnf.rtr_solicits != 0 &&
4168 (dev->flags&IFF_LOOPBACK) == 0;
4169 read_unlock_bh(&ifp->idev->lock);
4170
4171 /* While dad is in progress mld report's source address is in6_addrany.
4172 * Resend with proper ll now.
4173 */
4174 if (send_mld)
4175 ipv6_mc_dad_complete(ifp->idev);
4176
4177 /* send unsolicited NA if enabled */
4178 if (send_na &&
4179 (ifp->idev->cnf.ndisc_notify ||
4180 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4181 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4182 /*router=*/ !!ifp->idev->cnf.forwarding,
4183 /*solicited=*/ false, /*override=*/ true,
4184 /*inc_opt=*/ true);
4185 }
4186
4187 if (send_rs) {
4188 /*
4189 * If a host as already performed a random delay
4190 * [...] as part of DAD [...] there is no need
4191 * to delay again before sending the first RS
4192 */
4193 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4194 return;
4195 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4196
4197 write_lock_bh(&ifp->idev->lock);
4198 spin_lock(&ifp->lock);
4199 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4200 ifp->idev->cnf.rtr_solicit_interval);
4201 ifp->idev->rs_probes = 1;
4202 ifp->idev->if_flags |= IF_RS_SENT;
4203 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4204 spin_unlock(&ifp->lock);
4205 write_unlock_bh(&ifp->idev->lock);
4206 }
4207
4208 if (bump_id)
4209 rt_genid_bump_ipv6(dev_net(dev));
4210
4211 /* Make sure that a new temporary address will be created
4212 * before this temporary address becomes deprecated.
4213 */
4214 if (ifp->flags & IFA_F_TEMPORARY)
4215 addrconf_verify_rtnl();
4216 }
4217
4218 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4219 {
4220 struct inet6_ifaddr *ifp;
4221
4222 read_lock_bh(&idev->lock);
4223 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4224 spin_lock(&ifp->lock);
4225 if ((ifp->flags & IFA_F_TENTATIVE &&
4226 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4227 if (restart)
4228 ifp->state = INET6_IFADDR_STATE_PREDAD;
4229 addrconf_dad_kick(ifp);
4230 }
4231 spin_unlock(&ifp->lock);
4232 }
4233 read_unlock_bh(&idev->lock);
4234 }
4235
4236 #ifdef CONFIG_PROC_FS
4237 struct if6_iter_state {
4238 struct seq_net_private p;
4239 int bucket;
4240 int offset;
4241 };
4242
4243 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4244 {
4245 struct if6_iter_state *state = seq->private;
4246 struct net *net = seq_file_net(seq);
4247 struct inet6_ifaddr *ifa = NULL;
4248 int p = 0;
4249
4250 /* initial bucket if pos is 0 */
4251 if (pos == 0) {
4252 state->bucket = 0;
4253 state->offset = 0;
4254 }
4255
4256 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4257 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4258 addr_lst) {
4259 if (!net_eq(dev_net(ifa->idev->dev), net))
4260 continue;
4261 /* sync with offset */
4262 if (p < state->offset) {
4263 p++;
4264 continue;
4265 }
4266 return ifa;
4267 }
4268
4269 /* prepare for next bucket */
4270 state->offset = 0;
4271 p = 0;
4272 }
4273 return NULL;
4274 }
4275
4276 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4277 struct inet6_ifaddr *ifa)
4278 {
4279 struct if6_iter_state *state = seq->private;
4280 struct net *net = seq_file_net(seq);
4281
4282 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4283 if (!net_eq(dev_net(ifa->idev->dev), net))
4284 continue;
4285 state->offset++;
4286 return ifa;
4287 }
4288
4289 state->offset = 0;
4290 while (++state->bucket < IN6_ADDR_HSIZE) {
4291 hlist_for_each_entry_rcu(ifa,
4292 &inet6_addr_lst[state->bucket], addr_lst) {
4293 if (!net_eq(dev_net(ifa->idev->dev), net))
4294 continue;
4295 return ifa;
4296 }
4297 }
4298
4299 return NULL;
4300 }
4301
4302 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4303 __acquires(rcu)
4304 {
4305 rcu_read_lock();
4306 return if6_get_first(seq, *pos);
4307 }
4308
4309 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4310 {
4311 struct inet6_ifaddr *ifa;
4312
4313 ifa = if6_get_next(seq, v);
4314 ++*pos;
4315 return ifa;
4316 }
4317
4318 static void if6_seq_stop(struct seq_file *seq, void *v)
4319 __releases(rcu)
4320 {
4321 rcu_read_unlock();
4322 }
4323
4324 static int if6_seq_show(struct seq_file *seq, void *v)
4325 {
4326 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4327 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4328 &ifp->addr,
4329 ifp->idev->dev->ifindex,
4330 ifp->prefix_len,
4331 ifp->scope,
4332 (u8) ifp->flags,
4333 ifp->idev->dev->name);
4334 return 0;
4335 }
4336
4337 static const struct seq_operations if6_seq_ops = {
4338 .start = if6_seq_start,
4339 .next = if6_seq_next,
4340 .show = if6_seq_show,
4341 .stop = if6_seq_stop,
4342 };
4343
4344 static int __net_init if6_proc_net_init(struct net *net)
4345 {
4346 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4347 sizeof(struct if6_iter_state)))
4348 return -ENOMEM;
4349 return 0;
4350 }
4351
4352 static void __net_exit if6_proc_net_exit(struct net *net)
4353 {
4354 remove_proc_entry("if_inet6", net->proc_net);
4355 }
4356
4357 static struct pernet_operations if6_proc_net_ops = {
4358 .init = if6_proc_net_init,
4359 .exit = if6_proc_net_exit,
4360 };
4361
4362 int __init if6_proc_init(void)
4363 {
4364 return register_pernet_subsys(&if6_proc_net_ops);
4365 }
4366
4367 void if6_proc_exit(void)
4368 {
4369 unregister_pernet_subsys(&if6_proc_net_ops);
4370 }
4371 #endif /* CONFIG_PROC_FS */
4372
4373 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4374 /* Check if address is a home address configured on any interface. */
4375 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4376 {
4377 unsigned int hash = inet6_addr_hash(net, addr);
4378 struct inet6_ifaddr *ifp = NULL;
4379 int ret = 0;
4380
4381 rcu_read_lock();
4382 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4383 if (!net_eq(dev_net(ifp->idev->dev), net))
4384 continue;
4385 if (ipv6_addr_equal(&ifp->addr, addr) &&
4386 (ifp->flags & IFA_F_HOMEADDRESS)) {
4387 ret = 1;
4388 break;
4389 }
4390 }
4391 rcu_read_unlock();
4392 return ret;
4393 }
4394 #endif
4395
4396 /* RFC6554 has some algorithm to avoid loops in segment routing by
4397 * checking if the segments contains any of a local interface address.
4398 *
4399 * Quote:
4400 *
4401 * To detect loops in the SRH, a router MUST determine if the SRH
4402 * includes multiple addresses assigned to any interface on that router.
4403 * If such addresses appear more than once and are separated by at least
4404 * one address not assigned to that router.
4405 */
4406 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4407 unsigned char nsegs)
4408 {
4409 const struct in6_addr *addr;
4410 int i, ret = 0, found = 0;
4411 struct inet6_ifaddr *ifp;
4412 bool separated = false;
4413 unsigned int hash;
4414 bool hash_found;
4415
4416 rcu_read_lock();
4417 for (i = 0; i < nsegs; i++) {
4418 addr = &segs[i];
4419 hash = inet6_addr_hash(net, addr);
4420
4421 hash_found = false;
4422 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4423 if (!net_eq(dev_net(ifp->idev->dev), net))
4424 continue;
4425
4426 if (ipv6_addr_equal(&ifp->addr, addr)) {
4427 hash_found = true;
4428 break;
4429 }
4430 }
4431
4432 if (hash_found) {
4433 if (found > 1 && separated) {
4434 ret = 1;
4435 break;
4436 }
4437
4438 separated = false;
4439 found++;
4440 } else {
4441 separated = true;
4442 }
4443 }
4444 rcu_read_unlock();
4445
4446 return ret;
4447 }
4448
4449 /*
4450 * Periodic address status verification
4451 */
4452
4453 static void addrconf_verify_rtnl(void)
4454 {
4455 unsigned long now, next, next_sec, next_sched;
4456 struct inet6_ifaddr *ifp;
4457 int i;
4458
4459 ASSERT_RTNL();
4460
4461 rcu_read_lock_bh();
4462 now = jiffies;
4463 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4464
4465 cancel_delayed_work(&addr_chk_work);
4466
4467 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4468 restart:
4469 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4470 unsigned long age;
4471
4472 /* When setting preferred_lft to a value not zero or
4473 * infinity, while valid_lft is infinity
4474 * IFA_F_PERMANENT has a non-infinity life time.
4475 */
4476 if ((ifp->flags & IFA_F_PERMANENT) &&
4477 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4478 continue;
4479
4480 spin_lock(&ifp->lock);
4481 /* We try to batch several events at once. */
4482 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4483
4484 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4485 age >= ifp->valid_lft) {
4486 spin_unlock(&ifp->lock);
4487 in6_ifa_hold(ifp);
4488 rcu_read_unlock_bh();
4489 ipv6_del_addr(ifp);
4490 rcu_read_lock_bh();
4491 goto restart;
4492 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4493 spin_unlock(&ifp->lock);
4494 continue;
4495 } else if (age >= ifp->prefered_lft) {
4496 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4497 int deprecate = 0;
4498
4499 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4500 deprecate = 1;
4501 ifp->flags |= IFA_F_DEPRECATED;
4502 }
4503
4504 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4505 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4506 next = ifp->tstamp + ifp->valid_lft * HZ;
4507
4508 spin_unlock(&ifp->lock);
4509
4510 if (deprecate) {
4511 in6_ifa_hold(ifp);
4512
4513 ipv6_ifa_notify(0, ifp);
4514 in6_ifa_put(ifp);
4515 goto restart;
4516 }
4517 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4518 !(ifp->flags&IFA_F_TENTATIVE)) {
4519 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4520 ifp->idev->cnf.dad_transmits *
4521 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4522
4523 if (age >= ifp->prefered_lft - regen_advance) {
4524 struct inet6_ifaddr *ifpub = ifp->ifpub;
4525 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4526 next = ifp->tstamp + ifp->prefered_lft * HZ;
4527 if (!ifp->regen_count && ifpub) {
4528 ifp->regen_count++;
4529 in6_ifa_hold(ifp);
4530 in6_ifa_hold(ifpub);
4531 spin_unlock(&ifp->lock);
4532
4533 spin_lock(&ifpub->lock);
4534 ifpub->regen_count = 0;
4535 spin_unlock(&ifpub->lock);
4536 rcu_read_unlock_bh();
4537 ipv6_create_tempaddr(ifpub, true);
4538 in6_ifa_put(ifpub);
4539 in6_ifa_put(ifp);
4540 rcu_read_lock_bh();
4541 goto restart;
4542 }
4543 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4544 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4545 spin_unlock(&ifp->lock);
4546 } else {
4547 /* ifp->prefered_lft <= ifp->valid_lft */
4548 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4549 next = ifp->tstamp + ifp->prefered_lft * HZ;
4550 spin_unlock(&ifp->lock);
4551 }
4552 }
4553 }
4554
4555 next_sec = round_jiffies_up(next);
4556 next_sched = next;
4557
4558 /* If rounded timeout is accurate enough, accept it. */
4559 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4560 next_sched = next_sec;
4561
4562 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4563 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4564 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4565
4566 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4567 now, next, next_sec, next_sched);
4568 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4569 rcu_read_unlock_bh();
4570 }
4571
4572 static void addrconf_verify_work(struct work_struct *w)
4573 {
4574 rtnl_lock();
4575 addrconf_verify_rtnl();
4576 rtnl_unlock();
4577 }
4578
4579 static void addrconf_verify(void)
4580 {
4581 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4582 }
4583
4584 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4585 struct in6_addr **peer_pfx)
4586 {
4587 struct in6_addr *pfx = NULL;
4588
4589 *peer_pfx = NULL;
4590
4591 if (addr)
4592 pfx = nla_data(addr);
4593
4594 if (local) {
4595 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4596 *peer_pfx = pfx;
4597 pfx = nla_data(local);
4598 }
4599
4600 return pfx;
4601 }
4602
4603 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4604 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4605 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4606 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4607 [IFA_FLAGS] = { .len = sizeof(u32) },
4608 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4609 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4610 };
4611
4612 static int
4613 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4614 struct netlink_ext_ack *extack)
4615 {
4616 struct net *net = sock_net(skb->sk);
4617 struct ifaddrmsg *ifm;
4618 struct nlattr *tb[IFA_MAX+1];
4619 struct in6_addr *pfx, *peer_pfx;
4620 u32 ifa_flags;
4621 int err;
4622
4623 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4624 ifa_ipv6_policy, extack);
4625 if (err < 0)
4626 return err;
4627
4628 ifm = nlmsg_data(nlh);
4629 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4630 if (!pfx)
4631 return -EINVAL;
4632
4633 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4634
4635 /* We ignore other flags so far. */
4636 ifa_flags &= IFA_F_MANAGETEMPADDR;
4637
4638 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4639 ifm->ifa_prefixlen);
4640 }
4641
4642 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4643 unsigned long expires, u32 flags,
4644 bool modify_peer)
4645 {
4646 struct fib6_info *f6i;
4647 u32 prio;
4648
4649 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4650 ifp->prefix_len,
4651 ifp->idev->dev, 0, RTF_DEFAULT, true);
4652 if (!f6i)
4653 return -ENOENT;
4654
4655 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4656 if (f6i->fib6_metric != prio) {
4657 /* delete old one */
4658 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4659
4660 /* add new one */
4661 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4662 ifp->prefix_len,
4663 ifp->rt_priority, ifp->idev->dev,
4664 expires, flags, GFP_KERNEL);
4665 } else {
4666 if (!expires)
4667 fib6_clean_expires(f6i);
4668 else
4669 fib6_set_expires(f6i, expires);
4670
4671 fib6_info_release(f6i);
4672 }
4673
4674 return 0;
4675 }
4676
4677 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4678 {
4679 u32 flags;
4680 clock_t expires;
4681 unsigned long timeout;
4682 bool was_managetempaddr;
4683 bool had_prefixroute;
4684 bool new_peer = false;
4685
4686 ASSERT_RTNL();
4687
4688 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4689 return -EINVAL;
4690
4691 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4692 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4693 return -EINVAL;
4694
4695 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4696 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4697
4698 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4699 if (addrconf_finite_timeout(timeout)) {
4700 expires = jiffies_to_clock_t(timeout * HZ);
4701 cfg->valid_lft = timeout;
4702 flags = RTF_EXPIRES;
4703 } else {
4704 expires = 0;
4705 flags = 0;
4706 cfg->ifa_flags |= IFA_F_PERMANENT;
4707 }
4708
4709 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4710 if (addrconf_finite_timeout(timeout)) {
4711 if (timeout == 0)
4712 cfg->ifa_flags |= IFA_F_DEPRECATED;
4713 cfg->preferred_lft = timeout;
4714 }
4715
4716 if (cfg->peer_pfx &&
4717 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4718 if (!ipv6_addr_any(&ifp->peer_addr))
4719 cleanup_prefix_route(ifp, expires, true, true);
4720 new_peer = true;
4721 }
4722
4723 spin_lock_bh(&ifp->lock);
4724 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4725 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4726 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4727 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4728 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4729 IFA_F_NOPREFIXROUTE);
4730 ifp->flags |= cfg->ifa_flags;
4731 ifp->tstamp = jiffies;
4732 ifp->valid_lft = cfg->valid_lft;
4733 ifp->prefered_lft = cfg->preferred_lft;
4734
4735 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4736 ifp->rt_priority = cfg->rt_priority;
4737
4738 if (new_peer)
4739 ifp->peer_addr = *cfg->peer_pfx;
4740
4741 spin_unlock_bh(&ifp->lock);
4742 if (!(ifp->flags&IFA_F_TENTATIVE))
4743 ipv6_ifa_notify(0, ifp);
4744
4745 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4746 int rc = -ENOENT;
4747
4748 if (had_prefixroute)
4749 rc = modify_prefix_route(ifp, expires, flags, false);
4750
4751 /* prefix route could have been deleted; if so restore it */
4752 if (rc == -ENOENT) {
4753 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4754 ifp->rt_priority, ifp->idev->dev,
4755 expires, flags, GFP_KERNEL);
4756 }
4757
4758 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4759 rc = modify_prefix_route(ifp, expires, flags, true);
4760
4761 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4762 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4763 ifp->rt_priority, ifp->idev->dev,
4764 expires, flags, GFP_KERNEL);
4765 }
4766 } else if (had_prefixroute) {
4767 enum cleanup_prefix_rt_t action;
4768 unsigned long rt_expires;
4769
4770 write_lock_bh(&ifp->idev->lock);
4771 action = check_cleanup_prefix_route(ifp, &rt_expires);
4772 write_unlock_bh(&ifp->idev->lock);
4773
4774 if (action != CLEANUP_PREFIX_RT_NOP) {
4775 cleanup_prefix_route(ifp, rt_expires,
4776 action == CLEANUP_PREFIX_RT_DEL, false);
4777 }
4778 }
4779
4780 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4781 if (was_managetempaddr &&
4782 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4783 cfg->valid_lft = 0;
4784 cfg->preferred_lft = 0;
4785 }
4786 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4787 cfg->preferred_lft, !was_managetempaddr,
4788 jiffies);
4789 }
4790
4791 addrconf_verify_rtnl();
4792
4793 return 0;
4794 }
4795
4796 static int
4797 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4798 struct netlink_ext_ack *extack)
4799 {
4800 struct net *net = sock_net(skb->sk);
4801 struct ifaddrmsg *ifm;
4802 struct nlattr *tb[IFA_MAX+1];
4803 struct in6_addr *peer_pfx;
4804 struct inet6_ifaddr *ifa;
4805 struct net_device *dev;
4806 struct inet6_dev *idev;
4807 struct ifa6_config cfg;
4808 int err;
4809
4810 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4811 ifa_ipv6_policy, extack);
4812 if (err < 0)
4813 return err;
4814
4815 memset(&cfg, 0, sizeof(cfg));
4816
4817 ifm = nlmsg_data(nlh);
4818 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4819 if (!cfg.pfx)
4820 return -EINVAL;
4821
4822 cfg.peer_pfx = peer_pfx;
4823 cfg.plen = ifm->ifa_prefixlen;
4824 if (tb[IFA_RT_PRIORITY])
4825 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4826
4827 cfg.valid_lft = INFINITY_LIFE_TIME;
4828 cfg.preferred_lft = INFINITY_LIFE_TIME;
4829
4830 if (tb[IFA_CACHEINFO]) {
4831 struct ifa_cacheinfo *ci;
4832
4833 ci = nla_data(tb[IFA_CACHEINFO]);
4834 cfg.valid_lft = ci->ifa_valid;
4835 cfg.preferred_lft = ci->ifa_prefered;
4836 }
4837
4838 dev = __dev_get_by_index(net, ifm->ifa_index);
4839 if (!dev)
4840 return -ENODEV;
4841
4842 if (tb[IFA_FLAGS])
4843 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4844 else
4845 cfg.ifa_flags = ifm->ifa_flags;
4846
4847 /* We ignore other flags so far. */
4848 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4849 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4850 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4851
4852 idev = ipv6_find_idev(dev);
4853 if (IS_ERR(idev))
4854 return PTR_ERR(idev);
4855
4856 if (!ipv6_allow_optimistic_dad(net, idev))
4857 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4858
4859 if (cfg.ifa_flags & IFA_F_NODAD &&
4860 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4861 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4862 return -EINVAL;
4863 }
4864
4865 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4866 if (!ifa) {
4867 /*
4868 * It would be best to check for !NLM_F_CREATE here but
4869 * userspace already relies on not having to provide this.
4870 */
4871 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4872 }
4873
4874 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4875 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4876 err = -EEXIST;
4877 else
4878 err = inet6_addr_modify(ifa, &cfg);
4879
4880 in6_ifa_put(ifa);
4881
4882 return err;
4883 }
4884
4885 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4886 u8 scope, int ifindex)
4887 {
4888 struct ifaddrmsg *ifm;
4889
4890 ifm = nlmsg_data(nlh);
4891 ifm->ifa_family = AF_INET6;
4892 ifm->ifa_prefixlen = prefixlen;
4893 ifm->ifa_flags = flags;
4894 ifm->ifa_scope = scope;
4895 ifm->ifa_index = ifindex;
4896 }
4897
4898 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4899 unsigned long tstamp, u32 preferred, u32 valid)
4900 {
4901 struct ifa_cacheinfo ci;
4902
4903 ci.cstamp = cstamp_delta(cstamp);
4904 ci.tstamp = cstamp_delta(tstamp);
4905 ci.ifa_prefered = preferred;
4906 ci.ifa_valid = valid;
4907
4908 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4909 }
4910
4911 static inline int rt_scope(int ifa_scope)
4912 {
4913 if (ifa_scope & IFA_HOST)
4914 return RT_SCOPE_HOST;
4915 else if (ifa_scope & IFA_LINK)
4916 return RT_SCOPE_LINK;
4917 else if (ifa_scope & IFA_SITE)
4918 return RT_SCOPE_SITE;
4919 else
4920 return RT_SCOPE_UNIVERSE;
4921 }
4922
4923 static inline int inet6_ifaddr_msgsize(void)
4924 {
4925 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4926 + nla_total_size(16) /* IFA_LOCAL */
4927 + nla_total_size(16) /* IFA_ADDRESS */
4928 + nla_total_size(sizeof(struct ifa_cacheinfo))
4929 + nla_total_size(4) /* IFA_FLAGS */
4930 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4931 }
4932
4933 enum addr_type_t {
4934 UNICAST_ADDR,
4935 MULTICAST_ADDR,
4936 ANYCAST_ADDR,
4937 };
4938
4939 struct inet6_fill_args {
4940 u32 portid;
4941 u32 seq;
4942 int event;
4943 unsigned int flags;
4944 int netnsid;
4945 int ifindex;
4946 enum addr_type_t type;
4947 };
4948
4949 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4950 struct inet6_fill_args *args)
4951 {
4952 struct nlmsghdr *nlh;
4953 u32 preferred, valid;
4954
4955 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4956 sizeof(struct ifaddrmsg), args->flags);
4957 if (!nlh)
4958 return -EMSGSIZE;
4959
4960 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4961 ifa->idev->dev->ifindex);
4962
4963 if (args->netnsid >= 0 &&
4964 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4965 goto error;
4966
4967 if (!((ifa->flags&IFA_F_PERMANENT) &&
4968 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4969 preferred = ifa->prefered_lft;
4970 valid = ifa->valid_lft;
4971 if (preferred != INFINITY_LIFE_TIME) {
4972 long tval = (jiffies - ifa->tstamp)/HZ;
4973 if (preferred > tval)
4974 preferred -= tval;
4975 else
4976 preferred = 0;
4977 if (valid != INFINITY_LIFE_TIME) {
4978 if (valid > tval)
4979 valid -= tval;
4980 else
4981 valid = 0;
4982 }
4983 }
4984 } else {
4985 preferred = INFINITY_LIFE_TIME;
4986 valid = INFINITY_LIFE_TIME;
4987 }
4988
4989 if (!ipv6_addr_any(&ifa->peer_addr)) {
4990 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4991 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4992 goto error;
4993 } else
4994 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4995 goto error;
4996
4997 if (ifa->rt_priority &&
4998 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4999 goto error;
5000
5001 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5002 goto error;
5003
5004 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5005 goto error;
5006
5007 nlmsg_end(skb, nlh);
5008 return 0;
5009
5010 error:
5011 nlmsg_cancel(skb, nlh);
5012 return -EMSGSIZE;
5013 }
5014
5015 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5016 struct inet6_fill_args *args)
5017 {
5018 struct nlmsghdr *nlh;
5019 u8 scope = RT_SCOPE_UNIVERSE;
5020 int ifindex = ifmca->idev->dev->ifindex;
5021
5022 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5023 scope = RT_SCOPE_SITE;
5024
5025 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5026 sizeof(struct ifaddrmsg), args->flags);
5027 if (!nlh)
5028 return -EMSGSIZE;
5029
5030 if (args->netnsid >= 0 &&
5031 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5032 nlmsg_cancel(skb, nlh);
5033 return -EMSGSIZE;
5034 }
5035
5036 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5037 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5038 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5039 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5040 nlmsg_cancel(skb, nlh);
5041 return -EMSGSIZE;
5042 }
5043
5044 nlmsg_end(skb, nlh);
5045 return 0;
5046 }
5047
5048 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5049 struct inet6_fill_args *args)
5050 {
5051 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5052 int ifindex = dev ? dev->ifindex : 1;
5053 struct nlmsghdr *nlh;
5054 u8 scope = RT_SCOPE_UNIVERSE;
5055
5056 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5057 scope = RT_SCOPE_SITE;
5058
5059 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5060 sizeof(struct ifaddrmsg), args->flags);
5061 if (!nlh)
5062 return -EMSGSIZE;
5063
5064 if (args->netnsid >= 0 &&
5065 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5066 nlmsg_cancel(skb, nlh);
5067 return -EMSGSIZE;
5068 }
5069
5070 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5071 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5072 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5073 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5074 nlmsg_cancel(skb, nlh);
5075 return -EMSGSIZE;
5076 }
5077
5078 nlmsg_end(skb, nlh);
5079 return 0;
5080 }
5081
5082 /* called with rcu_read_lock() */
5083 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5084 struct netlink_callback *cb, int s_ip_idx,
5085 struct inet6_fill_args *fillargs)
5086 {
5087 struct ifmcaddr6 *ifmca;
5088 struct ifacaddr6 *ifaca;
5089 int ip_idx = 0;
5090 int err = 1;
5091
5092 read_lock_bh(&idev->lock);
5093 switch (fillargs->type) {
5094 case UNICAST_ADDR: {
5095 struct inet6_ifaddr *ifa;
5096 fillargs->event = RTM_NEWADDR;
5097
5098 /* unicast address incl. temp addr */
5099 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5100 if (ip_idx < s_ip_idx)
5101 goto next;
5102 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5103 if (err < 0)
5104 break;
5105 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5106 next:
5107 ip_idx++;
5108 }
5109 break;
5110 }
5111 case MULTICAST_ADDR:
5112 read_unlock_bh(&idev->lock);
5113 fillargs->event = RTM_GETMULTICAST;
5114
5115 /* multicast address */
5116 for (ifmca = rcu_dereference(idev->mc_list);
5117 ifmca;
5118 ifmca = rcu_dereference(ifmca->next), ip_idx++) {
5119 if (ip_idx < s_ip_idx)
5120 continue;
5121 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5122 if (err < 0)
5123 break;
5124 }
5125 read_lock_bh(&idev->lock);
5126 break;
5127 case ANYCAST_ADDR:
5128 fillargs->event = RTM_GETANYCAST;
5129 /* anycast address */
5130 for (ifaca = idev->ac_list; ifaca;
5131 ifaca = ifaca->aca_next, ip_idx++) {
5132 if (ip_idx < s_ip_idx)
5133 continue;
5134 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5135 if (err < 0)
5136 break;
5137 }
5138 break;
5139 default:
5140 break;
5141 }
5142 read_unlock_bh(&idev->lock);
5143 cb->args[2] = ip_idx;
5144 return err;
5145 }
5146
5147 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5148 struct inet6_fill_args *fillargs,
5149 struct net **tgt_net, struct sock *sk,
5150 struct netlink_callback *cb)
5151 {
5152 struct netlink_ext_ack *extack = cb->extack;
5153 struct nlattr *tb[IFA_MAX+1];
5154 struct ifaddrmsg *ifm;
5155 int err, i;
5156
5157 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5158 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5159 return -EINVAL;
5160 }
5161
5162 ifm = nlmsg_data(nlh);
5163 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5164 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5165 return -EINVAL;
5166 }
5167
5168 fillargs->ifindex = ifm->ifa_index;
5169 if (fillargs->ifindex) {
5170 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5171 fillargs->flags |= NLM_F_DUMP_FILTERED;
5172 }
5173
5174 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5175 ifa_ipv6_policy, extack);
5176 if (err < 0)
5177 return err;
5178
5179 for (i = 0; i <= IFA_MAX; ++i) {
5180 if (!tb[i])
5181 continue;
5182
5183 if (i == IFA_TARGET_NETNSID) {
5184 struct net *net;
5185
5186 fillargs->netnsid = nla_get_s32(tb[i]);
5187 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5188 if (IS_ERR(net)) {
5189 fillargs->netnsid = -1;
5190 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5191 return PTR_ERR(net);
5192 }
5193 *tgt_net = net;
5194 } else {
5195 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5196 return -EINVAL;
5197 }
5198 }
5199
5200 return 0;
5201 }
5202
5203 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5204 enum addr_type_t type)
5205 {
5206 const struct nlmsghdr *nlh = cb->nlh;
5207 struct inet6_fill_args fillargs = {
5208 .portid = NETLINK_CB(cb->skb).portid,
5209 .seq = cb->nlh->nlmsg_seq,
5210 .flags = NLM_F_MULTI,
5211 .netnsid = -1,
5212 .type = type,
5213 };
5214 struct net *net = sock_net(skb->sk);
5215 struct net *tgt_net = net;
5216 int idx, s_idx, s_ip_idx;
5217 int h, s_h;
5218 struct net_device *dev;
5219 struct inet6_dev *idev;
5220 struct hlist_head *head;
5221 int err = 0;
5222
5223 s_h = cb->args[0];
5224 s_idx = idx = cb->args[1];
5225 s_ip_idx = cb->args[2];
5226
5227 if (cb->strict_check) {
5228 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5229 skb->sk, cb);
5230 if (err < 0)
5231 goto put_tgt_net;
5232
5233 err = 0;
5234 if (fillargs.ifindex) {
5235 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5236 if (!dev) {
5237 err = -ENODEV;
5238 goto put_tgt_net;
5239 }
5240 idev = __in6_dev_get(dev);
5241 if (idev) {
5242 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5243 &fillargs);
5244 if (err > 0)
5245 err = 0;
5246 }
5247 goto put_tgt_net;
5248 }
5249 }
5250
5251 rcu_read_lock();
5252 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5253 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5254 idx = 0;
5255 head = &tgt_net->dev_index_head[h];
5256 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5257 if (idx < s_idx)
5258 goto cont;
5259 if (h > s_h || idx > s_idx)
5260 s_ip_idx = 0;
5261 idev = __in6_dev_get(dev);
5262 if (!idev)
5263 goto cont;
5264
5265 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5266 &fillargs) < 0)
5267 goto done;
5268 cont:
5269 idx++;
5270 }
5271 }
5272 done:
5273 rcu_read_unlock();
5274 cb->args[0] = h;
5275 cb->args[1] = idx;
5276 put_tgt_net:
5277 if (fillargs.netnsid >= 0)
5278 put_net(tgt_net);
5279
5280 return skb->len ? : err;
5281 }
5282
5283 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5284 {
5285 enum addr_type_t type = UNICAST_ADDR;
5286
5287 return inet6_dump_addr(skb, cb, type);
5288 }
5289
5290 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5291 {
5292 enum addr_type_t type = MULTICAST_ADDR;
5293
5294 return inet6_dump_addr(skb, cb, type);
5295 }
5296
5297
5298 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5299 {
5300 enum addr_type_t type = ANYCAST_ADDR;
5301
5302 return inet6_dump_addr(skb, cb, type);
5303 }
5304
5305 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5306 const struct nlmsghdr *nlh,
5307 struct nlattr **tb,
5308 struct netlink_ext_ack *extack)
5309 {
5310 struct ifaddrmsg *ifm;
5311 int i, err;
5312
5313 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5314 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5315 return -EINVAL;
5316 }
5317
5318 if (!netlink_strict_get_check(skb))
5319 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5320 ifa_ipv6_policy, extack);
5321
5322 ifm = nlmsg_data(nlh);
5323 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5324 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5325 return -EINVAL;
5326 }
5327
5328 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5329 ifa_ipv6_policy, extack);
5330 if (err)
5331 return err;
5332
5333 for (i = 0; i <= IFA_MAX; i++) {
5334 if (!tb[i])
5335 continue;
5336
5337 switch (i) {
5338 case IFA_TARGET_NETNSID:
5339 case IFA_ADDRESS:
5340 case IFA_LOCAL:
5341 break;
5342 default:
5343 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5344 return -EINVAL;
5345 }
5346 }
5347
5348 return 0;
5349 }
5350
5351 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5352 struct netlink_ext_ack *extack)
5353 {
5354 struct net *net = sock_net(in_skb->sk);
5355 struct inet6_fill_args fillargs = {
5356 .portid = NETLINK_CB(in_skb).portid,
5357 .seq = nlh->nlmsg_seq,
5358 .event = RTM_NEWADDR,
5359 .flags = 0,
5360 .netnsid = -1,
5361 };
5362 struct net *tgt_net = net;
5363 struct ifaddrmsg *ifm;
5364 struct nlattr *tb[IFA_MAX+1];
5365 struct in6_addr *addr = NULL, *peer;
5366 struct net_device *dev = NULL;
5367 struct inet6_ifaddr *ifa;
5368 struct sk_buff *skb;
5369 int err;
5370
5371 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5372 if (err < 0)
5373 return err;
5374
5375 if (tb[IFA_TARGET_NETNSID]) {
5376 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5377
5378 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5379 fillargs.netnsid);
5380 if (IS_ERR(tgt_net))
5381 return PTR_ERR(tgt_net);
5382 }
5383
5384 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5385 if (!addr)
5386 return -EINVAL;
5387
5388 ifm = nlmsg_data(nlh);
5389 if (ifm->ifa_index)
5390 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5391
5392 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5393 if (!ifa) {
5394 err = -EADDRNOTAVAIL;
5395 goto errout;
5396 }
5397
5398 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5399 if (!skb) {
5400 err = -ENOBUFS;
5401 goto errout_ifa;
5402 }
5403
5404 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5405 if (err < 0) {
5406 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5407 WARN_ON(err == -EMSGSIZE);
5408 kfree_skb(skb);
5409 goto errout_ifa;
5410 }
5411 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5412 errout_ifa:
5413 in6_ifa_put(ifa);
5414 errout:
5415 if (dev)
5416 dev_put(dev);
5417 if (fillargs.netnsid >= 0)
5418 put_net(tgt_net);
5419
5420 return err;
5421 }
5422
5423 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5424 {
5425 struct sk_buff *skb;
5426 struct net *net = dev_net(ifa->idev->dev);
5427 struct inet6_fill_args fillargs = {
5428 .portid = 0,
5429 .seq = 0,
5430 .event = event,
5431 .flags = 0,
5432 .netnsid = -1,
5433 };
5434 int err = -ENOBUFS;
5435
5436 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5437 if (!skb)
5438 goto errout;
5439
5440 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5441 if (err < 0) {
5442 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5443 WARN_ON(err == -EMSGSIZE);
5444 kfree_skb(skb);
5445 goto errout;
5446 }
5447 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5448 return;
5449 errout:
5450 if (err < 0)
5451 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5452 }
5453
5454 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5455 __s32 *array, int bytes)
5456 {
5457 BUG_ON(bytes < (DEVCONF_MAX * 4));
5458
5459 memset(array, 0, bytes);
5460 array[DEVCONF_FORWARDING] = cnf->forwarding;
5461 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5462 array[DEVCONF_MTU6] = cnf->mtu6;
5463 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5464 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5465 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5466 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5467 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5468 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5469 jiffies_to_msecs(cnf->rtr_solicit_interval);
5470 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5471 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5472 array[DEVCONF_RTR_SOLICIT_DELAY] =
5473 jiffies_to_msecs(cnf->rtr_solicit_delay);
5474 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5475 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5476 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5477 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5478 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5479 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5480 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5481 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5482 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5483 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5484 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5485 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5486 array[DEVCONF_RA_DEFRTR_METRIC] = cnf->ra_defrtr_metric;
5487 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5488 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5489 #ifdef CONFIG_IPV6_ROUTER_PREF
5490 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5491 array[DEVCONF_RTR_PROBE_INTERVAL] =
5492 jiffies_to_msecs(cnf->rtr_probe_interval);
5493 #ifdef CONFIG_IPV6_ROUTE_INFO
5494 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5495 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5496 #endif
5497 #endif
5498 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5499 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5500 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5501 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5502 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5503 #endif
5504 #ifdef CONFIG_IPV6_MROUTE
5505 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5506 #endif
5507 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5508 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5509 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5510 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5511 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5512 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5513 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5514 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5515 /* we omit DEVCONF_STABLE_SECRET for now */
5516 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5517 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5518 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5519 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5520 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5521 #ifdef CONFIG_IPV6_SEG6_HMAC
5522 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5523 #endif
5524 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5525 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5526 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5527 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5528 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5529 }
5530
5531 static inline size_t inet6_ifla6_size(void)
5532 {
5533 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5534 + nla_total_size(sizeof(struct ifla_cacheinfo))
5535 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5536 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5537 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5538 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5539 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5540 + 0;
5541 }
5542
5543 static inline size_t inet6_if_nlmsg_size(void)
5544 {
5545 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5546 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5547 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5548 + nla_total_size(4) /* IFLA_MTU */
5549 + nla_total_size(4) /* IFLA_LINK */
5550 + nla_total_size(1) /* IFLA_OPERSTATE */
5551 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5552 }
5553
5554 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5555 int bytes)
5556 {
5557 int i;
5558 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5559 BUG_ON(pad < 0);
5560
5561 /* Use put_unaligned() because stats may not be aligned for u64. */
5562 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5563 for (i = 1; i < ICMP6_MIB_MAX; i++)
5564 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5565
5566 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5567 }
5568
5569 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5570 int bytes, size_t syncpoff)
5571 {
5572 int i, c;
5573 u64 buff[IPSTATS_MIB_MAX];
5574 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5575
5576 BUG_ON(pad < 0);
5577
5578 memset(buff, 0, sizeof(buff));
5579 buff[0] = IPSTATS_MIB_MAX;
5580
5581 for_each_possible_cpu(c) {
5582 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5583 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5584 }
5585
5586 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5587 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5588 }
5589
5590 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5591 int bytes)
5592 {
5593 switch (attrtype) {
5594 case IFLA_INET6_STATS:
5595 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5596 offsetof(struct ipstats_mib, syncp));
5597 break;
5598 case IFLA_INET6_ICMP6STATS:
5599 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5600 break;
5601 }
5602 }
5603
5604 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5605 u32 ext_filter_mask)
5606 {
5607 struct nlattr *nla;
5608 struct ifla_cacheinfo ci;
5609
5610 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5611 goto nla_put_failure;
5612 ci.max_reasm_len = IPV6_MAXPLEN;
5613 ci.tstamp = cstamp_delta(idev->tstamp);
5614 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5615 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5616 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5617 goto nla_put_failure;
5618 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5619 if (!nla)
5620 goto nla_put_failure;
5621 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5622
5623 /* XXX - MC not implemented */
5624
5625 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5626 return 0;
5627
5628 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5629 if (!nla)
5630 goto nla_put_failure;
5631 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5632
5633 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5634 if (!nla)
5635 goto nla_put_failure;
5636 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5637
5638 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5639 if (!nla)
5640 goto nla_put_failure;
5641 read_lock_bh(&idev->lock);
5642 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5643 read_unlock_bh(&idev->lock);
5644
5645 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5646 goto nla_put_failure;
5647
5648 return 0;
5649
5650 nla_put_failure:
5651 return -EMSGSIZE;
5652 }
5653
5654 static size_t inet6_get_link_af_size(const struct net_device *dev,
5655 u32 ext_filter_mask)
5656 {
5657 if (!__in6_dev_get(dev))
5658 return 0;
5659
5660 return inet6_ifla6_size();
5661 }
5662
5663 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5664 u32 ext_filter_mask)
5665 {
5666 struct inet6_dev *idev = __in6_dev_get(dev);
5667
5668 if (!idev)
5669 return -ENODATA;
5670
5671 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5672 return -EMSGSIZE;
5673
5674 return 0;
5675 }
5676
5677 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token,
5678 struct netlink_ext_ack *extack)
5679 {
5680 struct inet6_ifaddr *ifp;
5681 struct net_device *dev = idev->dev;
5682 bool clear_token, update_rs = false;
5683 struct in6_addr ll_addr;
5684
5685 ASSERT_RTNL();
5686
5687 if (!token)
5688 return -EINVAL;
5689
5690 if (dev->flags & IFF_LOOPBACK) {
5691 NL_SET_ERR_MSG_MOD(extack, "Device is loopback");
5692 return -EINVAL;
5693 }
5694
5695 if (dev->flags & IFF_NOARP) {
5696 NL_SET_ERR_MSG_MOD(extack,
5697 "Device does not do neighbour discovery");
5698 return -EINVAL;
5699 }
5700
5701 if (!ipv6_accept_ra(idev)) {
5702 NL_SET_ERR_MSG_MOD(extack,
5703 "Router advertisement is disabled on device");
5704 return -EINVAL;
5705 }
5706
5707 if (idev->cnf.rtr_solicits == 0) {
5708 NL_SET_ERR_MSG(extack,
5709 "Router solicitation is disabled on device");
5710 return -EINVAL;
5711 }
5712
5713 write_lock_bh(&idev->lock);
5714
5715 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5716 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5717
5718 write_unlock_bh(&idev->lock);
5719
5720 clear_token = ipv6_addr_any(token);
5721 if (clear_token)
5722 goto update_lft;
5723
5724 if (!idev->dead && (idev->if_flags & IF_READY) &&
5725 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5726 IFA_F_OPTIMISTIC)) {
5727 /* If we're not ready, then normal ifup will take care
5728 * of this. Otherwise, we need to request our rs here.
5729 */
5730 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5731 update_rs = true;
5732 }
5733
5734 update_lft:
5735 write_lock_bh(&idev->lock);
5736
5737 if (update_rs) {
5738 idev->if_flags |= IF_RS_SENT;
5739 idev->rs_interval = rfc3315_s14_backoff_init(
5740 idev->cnf.rtr_solicit_interval);
5741 idev->rs_probes = 1;
5742 addrconf_mod_rs_timer(idev, idev->rs_interval);
5743 }
5744
5745 /* Well, that's kinda nasty ... */
5746 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5747 spin_lock(&ifp->lock);
5748 if (ifp->tokenized) {
5749 ifp->valid_lft = 0;
5750 ifp->prefered_lft = 0;
5751 }
5752 spin_unlock(&ifp->lock);
5753 }
5754
5755 write_unlock_bh(&idev->lock);
5756 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5757 addrconf_verify_rtnl();
5758 return 0;
5759 }
5760
5761 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5762 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5763 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5764 };
5765
5766 static int