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Linux 5.1.15
[linux/fpc-iii.git] / net / ipv6 / addrconf.c
blob4ae17a966ae3d714fdf711d847e4e3ca73458ec2
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/sched/signal.h>
47 #include <linux/socket.h>
48 #include <linux/sockios.h>
49 #include <linux/net.h>
50 #include <linux/inet.h>
51 #include <linux/in6.h>
52 #include <linux/netdevice.h>
53 #include <linux/if_addr.h>
54 #include <linux/if_arp.h>
55 #include <linux/if_arcnet.h>
56 #include <linux/if_infiniband.h>
57 #include <linux/route.h>
58 #include <linux/inetdevice.h>
59 #include <linux/init.h>
60 #include <linux/slab.h>
61 #ifdef CONFIG_SYSCTL
62 #include <linux/sysctl.h>
63 #endif
64 #include <linux/capability.h>
65 #include <linux/delay.h>
66 #include <linux/notifier.h>
67 #include <linux/string.h>
68 #include <linux/hash.h>
69
70 #include <net/net_namespace.h>
71 #include <net/sock.h>
72 #include <net/snmp.h>
73
74 #include <net/6lowpan.h>
75 #include <net/firewire.h>
76 #include <net/ipv6.h>
77 #include <net/protocol.h>
78 #include <net/ndisc.h>
79 #include <net/ip6_route.h>
80 #include <net/addrconf.h>
81 #include <net/tcp.h>
82 #include <net/ip.h>
83 #include <net/netlink.h>
84 #include <net/pkt_sched.h>
85 #include <net/l3mdev.h>
86 #include <linux/if_tunnel.h>
87 #include <linux/rtnetlink.h>
88 #include <linux/netconf.h>
89 #include <linux/random.h>
90 #include <linux/uaccess.h>
91 #include <asm/unaligned.h>
92
93 #include <linux/proc_fs.h>
94 #include <linux/seq_file.h>
95 #include <linux/export.h>
96
97 #define INFINITY_LIFE_TIME 0xFFFFFFFF
98
99 #define IPV6_MAX_STRLEN \
100 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
101
102 static inline u32 cstamp_delta(unsigned long cstamp)
103 {
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105 }
106
107 static inline s32 rfc3315_s14_backoff_init(s32 irt)
108 {
109 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
110 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
111 do_div(tmp, 1000000);
112 return (s32)tmp;
113 }
114
115 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
116 {
117 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
118 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
119 do_div(tmp, 1000000);
120 if ((s32)tmp > mrt) {
121 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
122 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
123 do_div(tmp, 1000000);
124 }
125 return (s32)tmp;
126 }
127
128 #ifdef CONFIG_SYSCTL
129 static int addrconf_sysctl_register(struct inet6_dev *idev);
130 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
131 #else
132 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
133 {
134 return 0;
135 }
136
137 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
138 {
139 }
140 #endif
141
142 static void ipv6_regen_rndid(struct inet6_dev *idev);
143 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
144
145 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
146 static int ipv6_count_addresses(const struct inet6_dev *idev);
147 static int ipv6_generate_stable_address(struct in6_addr *addr,
148 u8 dad_count,
149 const struct inet6_dev *idev);
150
151 #define IN6_ADDR_HSIZE_SHIFT 8
152 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
153 /*
154 * Configured unicast address hash table
155 */
156 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
157 static DEFINE_SPINLOCK(addrconf_hash_lock);
158
159 static void addrconf_verify(void);
160 static void addrconf_verify_rtnl(void);
161 static void addrconf_verify_work(struct work_struct *);
162
163 static struct workqueue_struct *addrconf_wq;
164 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
165
166 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
167 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
168
169 static void addrconf_type_change(struct net_device *dev,
170 unsigned long event);
171 static int addrconf_ifdown(struct net_device *dev, int how);
172
173 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
174 int plen,
175 const struct net_device *dev,
176 u32 flags, u32 noflags);
177
178 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
179 static void addrconf_dad_work(struct work_struct *w);
180 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
181 bool send_na);
182 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
183 static void addrconf_rs_timer(struct timer_list *t);
184 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
185 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
186
187 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
188 struct prefix_info *pinfo);
189
190 static struct ipv6_devconf ipv6_devconf __read_mostly = {
191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .force_mld_version = 0,
198 .mldv1_unsolicited_report_interval = 10 * HZ,
199 .mldv2_unsolicited_report_interval = HZ,
200 .dad_transmits = 1,
201 .rtr_solicits = MAX_RTR_SOLICITATIONS,
202 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
203 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
205 .use_tempaddr = 0,
206 .temp_valid_lft = TEMP_VALID_LIFETIME,
207 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
208 .regen_max_retry = REGEN_MAX_RETRY,
209 .max_desync_factor = MAX_DESYNC_FACTOR,
210 .max_addresses = IPV6_MAX_ADDRESSES,
211 .accept_ra_defrtr = 1,
212 .accept_ra_from_local = 0,
213 .accept_ra_min_hop_limit= 1,
214 .accept_ra_pinfo = 1,
215 #ifdef CONFIG_IPV6_ROUTER_PREF
216 .accept_ra_rtr_pref = 1,
217 .rtr_probe_interval = 60 * HZ,
218 #ifdef CONFIG_IPV6_ROUTE_INFO
219 .accept_ra_rt_info_min_plen = 0,
220 .accept_ra_rt_info_max_plen = 0,
221 #endif
222 #endif
223 .proxy_ndp = 0,
224 .accept_source_route = 0, /* we do not accept RH0 by default. */
225 .disable_ipv6 = 0,
226 .accept_dad = 0,
227 .suppress_frag_ndisc = 1,
228 .accept_ra_mtu = 1,
229 .stable_secret = {
230 .initialized = false,
231 },
232 .use_oif_addrs_only = 0,
233 .ignore_routes_with_linkdown = 0,
234 .keep_addr_on_down = 0,
235 .seg6_enabled = 0,
236 #ifdef CONFIG_IPV6_SEG6_HMAC
237 .seg6_require_hmac = 0,
238 #endif
239 .enhanced_dad = 1,
240 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
241 .disable_policy = 0,
242 };
243
244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
245 .forwarding = 0,
246 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
247 .mtu6 = IPV6_MIN_MTU,
248 .accept_ra = 1,
249 .accept_redirects = 1,
250 .autoconf = 1,
251 .force_mld_version = 0,
252 .mldv1_unsolicited_report_interval = 10 * HZ,
253 .mldv2_unsolicited_report_interval = HZ,
254 .dad_transmits = 1,
255 .rtr_solicits = MAX_RTR_SOLICITATIONS,
256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
259 .use_tempaddr = 0,
260 .temp_valid_lft = TEMP_VALID_LIFETIME,
261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
262 .regen_max_retry = REGEN_MAX_RETRY,
263 .max_desync_factor = MAX_DESYNC_FACTOR,
264 .max_addresses = IPV6_MAX_ADDRESSES,
265 .accept_ra_defrtr = 1,
266 .accept_ra_from_local = 0,
267 .accept_ra_min_hop_limit= 1,
268 .accept_ra_pinfo = 1,
269 #ifdef CONFIG_IPV6_ROUTER_PREF
270 .accept_ra_rtr_pref = 1,
271 .rtr_probe_interval = 60 * HZ,
272 #ifdef CONFIG_IPV6_ROUTE_INFO
273 .accept_ra_rt_info_min_plen = 0,
274 .accept_ra_rt_info_max_plen = 0,
275 #endif
276 #endif
277 .proxy_ndp = 0,
278 .accept_source_route = 0, /* we do not accept RH0 by default. */
279 .disable_ipv6 = 0,
280 .accept_dad = 1,
281 .suppress_frag_ndisc = 1,
282 .accept_ra_mtu = 1,
283 .stable_secret = {
284 .initialized = false,
285 },
286 .use_oif_addrs_only = 0,
287 .ignore_routes_with_linkdown = 0,
288 .keep_addr_on_down = 0,
289 .seg6_enabled = 0,
290 #ifdef CONFIG_IPV6_SEG6_HMAC
291 .seg6_require_hmac = 0,
292 #endif
293 .enhanced_dad = 1,
294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
295 .disable_policy = 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 } else
437 ipv6_regen_rndid(ndev);
438
439 ndev->token = in6addr_any;
440
441 if (netif_running(dev) && addrconf_link_ready(dev))
442 ndev->if_flags |= IF_READY;
443
444 ipv6_mc_init_dev(ndev);
445 ndev->tstamp = jiffies;
446 err = addrconf_sysctl_register(ndev);
447 if (err) {
448 ipv6_mc_destroy_dev(ndev);
449 snmp6_unregister_dev(ndev);
450 goto err_release;
451 }
452 /* protected by rtnl_lock */
453 rcu_assign_pointer(dev->ip6_ptr, ndev);
454
455 /* Join interface-local all-node multicast group */
456 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
457
458 /* Join all-node multicast group */
459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
460
461 /* Join all-router multicast group if forwarding is set */
462 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
463 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
464
465 return ndev;
466
467 err_release:
468 neigh_parms_release(&nd_tbl, ndev->nd_parms);
469 ndev->dead = 1;
470 in6_dev_finish_destroy(ndev);
471 return ERR_PTR(err);
472 }
473
474 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
475 {
476 struct inet6_dev *idev;
477
478 ASSERT_RTNL();
479
480 idev = __in6_dev_get(dev);
481 if (!idev) {
482 idev = ipv6_add_dev(dev);
483 if (IS_ERR(idev))
484 return NULL;
485 }
486
487 if (dev->flags&IFF_UP)
488 ipv6_mc_up(idev);
489 return idev;
490 }
491
492 static int inet6_netconf_msgsize_devconf(int type)
493 {
494 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
495 + nla_total_size(4); /* NETCONFA_IFINDEX */
496 bool all = false;
497
498 if (type == NETCONFA_ALL)
499 all = true;
500
501 if (all || type == NETCONFA_FORWARDING)
502 size += nla_total_size(4);
503 #ifdef CONFIG_IPV6_MROUTE
504 if (all || type == NETCONFA_MC_FORWARDING)
505 size += nla_total_size(4);
506 #endif
507 if (all || type == NETCONFA_PROXY_NEIGH)
508 size += nla_total_size(4);
509
510 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
511 size += nla_total_size(4);
512
513 return size;
514 }
515
516 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
517 struct ipv6_devconf *devconf, u32 portid,
518 u32 seq, int event, unsigned int flags,
519 int type)
520 {
521 struct nlmsghdr *nlh;
522 struct netconfmsg *ncm;
523 bool all = false;
524
525 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
526 flags);
527 if (!nlh)
528 return -EMSGSIZE;
529
530 if (type == NETCONFA_ALL)
531 all = true;
532
533 ncm = nlmsg_data(nlh);
534 ncm->ncm_family = AF_INET6;
535
536 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
537 goto nla_put_failure;
538
539 if (!devconf)
540 goto out;
541
542 if ((all || type == NETCONFA_FORWARDING) &&
543 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
544 goto nla_put_failure;
545 #ifdef CONFIG_IPV6_MROUTE
546 if ((all || type == NETCONFA_MC_FORWARDING) &&
547 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
548 devconf->mc_forwarding) < 0)
549 goto nla_put_failure;
550 #endif
551 if ((all || type == NETCONFA_PROXY_NEIGH) &&
552 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
553 goto nla_put_failure;
554
555 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
556 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
557 devconf->ignore_routes_with_linkdown) < 0)
558 goto nla_put_failure;
559
560 out:
561 nlmsg_end(skb, nlh);
562 return 0;
563
564 nla_put_failure:
565 nlmsg_cancel(skb, nlh);
566 return -EMSGSIZE;
567 }
568
569 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
570 int ifindex, struct ipv6_devconf *devconf)
571 {
572 struct sk_buff *skb;
573 int err = -ENOBUFS;
574
575 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
576 if (!skb)
577 goto errout;
578
579 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
580 event, 0, type);
581 if (err < 0) {
582 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
583 WARN_ON(err == -EMSGSIZE);
584 kfree_skb(skb);
585 goto errout;
586 }
587 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
588 return;
589 errout:
590 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
591 }
592
593 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
594 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
595 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
596 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
597 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
598 };
599
600 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
601 const struct nlmsghdr *nlh,
602 struct nlattr **tb,
603 struct netlink_ext_ack *extack)
604 {
605 int i, err;
606
607 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
608 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
609 return -EINVAL;
610 }
611
612 if (!netlink_strict_get_check(skb))
613 return nlmsg_parse(nlh, sizeof(struct netconfmsg), tb,
614 NETCONFA_MAX, devconf_ipv6_policy, extack);
615
616 err = nlmsg_parse_strict(nlh, sizeof(struct netconfmsg), tb,
617 NETCONFA_MAX, devconf_ipv6_policy, extack);
618 if (err)
619 return err;
620
621 for (i = 0; i <= NETCONFA_MAX; i++) {
622 if (!tb[i])
623 continue;
624
625 switch (i) {
626 case NETCONFA_IFINDEX:
627 break;
628 default:
629 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
630 return -EINVAL;
631 }
632 }
633
634 return 0;
635 }
636
637 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
638 struct nlmsghdr *nlh,
639 struct netlink_ext_ack *extack)
640 {
641 struct net *net = sock_net(in_skb->sk);
642 struct nlattr *tb[NETCONFA_MAX+1];
643 struct inet6_dev *in6_dev = NULL;
644 struct net_device *dev = NULL;
645 struct sk_buff *skb;
646 struct ipv6_devconf *devconf;
647 int ifindex;
648 int err;
649
650 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
651 if (err < 0)
652 return err;
653
654 if (!tb[NETCONFA_IFINDEX])
655 return -EINVAL;
656
657 err = -EINVAL;
658 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
659 switch (ifindex) {
660 case NETCONFA_IFINDEX_ALL:
661 devconf = net->ipv6.devconf_all;
662 break;
663 case NETCONFA_IFINDEX_DEFAULT:
664 devconf = net->ipv6.devconf_dflt;
665 break;
666 default:
667 dev = dev_get_by_index(net, ifindex);
668 if (!dev)
669 return -EINVAL;
670 in6_dev = in6_dev_get(dev);
671 if (!in6_dev)
672 goto errout;
673 devconf = &in6_dev->cnf;
674 break;
675 }
676
677 err = -ENOBUFS;
678 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
679 if (!skb)
680 goto errout;
681
682 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
683 NETLINK_CB(in_skb).portid,
684 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
685 NETCONFA_ALL);
686 if (err < 0) {
687 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
688 WARN_ON(err == -EMSGSIZE);
689 kfree_skb(skb);
690 goto errout;
691 }
692 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
693 errout:
694 if (in6_dev)
695 in6_dev_put(in6_dev);
696 if (dev)
697 dev_put(dev);
698 return err;
699 }
700
701 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
702 struct netlink_callback *cb)
703 {
704 const struct nlmsghdr *nlh = cb->nlh;
705 struct net *net = sock_net(skb->sk);
706 int h, s_h;
707 int idx, s_idx;
708 struct net_device *dev;
709 struct inet6_dev *idev;
710 struct hlist_head *head;
711
712 if (cb->strict_check) {
713 struct netlink_ext_ack *extack = cb->extack;
714 struct netconfmsg *ncm;
715
716 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
717 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
718 return -EINVAL;
719 }
720
721 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
722 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
723 return -EINVAL;
724 }
725 }
726
727 s_h = cb->args[0];
728 s_idx = idx = cb->args[1];
729
730 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
731 idx = 0;
732 head = &net->dev_index_head[h];
733 rcu_read_lock();
734 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
735 net->dev_base_seq;
736 hlist_for_each_entry_rcu(dev, head, index_hlist) {
737 if (idx < s_idx)
738 goto cont;
739 idev = __in6_dev_get(dev);
740 if (!idev)
741 goto cont;
742
743 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
744 &idev->cnf,
745 NETLINK_CB(cb->skb).portid,
746 nlh->nlmsg_seq,
747 RTM_NEWNETCONF,
748 NLM_F_MULTI,
749 NETCONFA_ALL) < 0) {
750 rcu_read_unlock();
751 goto done;
752 }
753 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
754 cont:
755 idx++;
756 }
757 rcu_read_unlock();
758 }
759 if (h == NETDEV_HASHENTRIES) {
760 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
761 net->ipv6.devconf_all,
762 NETLINK_CB(cb->skb).portid,
763 nlh->nlmsg_seq,
764 RTM_NEWNETCONF, NLM_F_MULTI,
765 NETCONFA_ALL) < 0)
766 goto done;
767 else
768 h++;
769 }
770 if (h == NETDEV_HASHENTRIES + 1) {
771 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
772 net->ipv6.devconf_dflt,
773 NETLINK_CB(cb->skb).portid,
774 nlh->nlmsg_seq,
775 RTM_NEWNETCONF, NLM_F_MULTI,
776 NETCONFA_ALL) < 0)
777 goto done;
778 else
779 h++;
780 }
781 done:
782 cb->args[0] = h;
783 cb->args[1] = idx;
784
785 return skb->len;
786 }
787
788 #ifdef CONFIG_SYSCTL
789 static void dev_forward_change(struct inet6_dev *idev)
790 {
791 struct net_device *dev;
792 struct inet6_ifaddr *ifa;
793
794 if (!idev)
795 return;
796 dev = idev->dev;
797 if (idev->cnf.forwarding)
798 dev_disable_lro(dev);
799 if (dev->flags & IFF_MULTICAST) {
800 if (idev->cnf.forwarding) {
801 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
802 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
803 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
804 } else {
805 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
806 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
807 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
808 }
809 }
810
811 list_for_each_entry(ifa, &idev->addr_list, if_list) {
812 if (ifa->flags&IFA_F_TENTATIVE)
813 continue;
814 if (idev->cnf.forwarding)
815 addrconf_join_anycast(ifa);
816 else
817 addrconf_leave_anycast(ifa);
818 }
819 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
820 NETCONFA_FORWARDING,
821 dev->ifindex, &idev->cnf);
822 }
823
824
825 static void addrconf_forward_change(struct net *net, __s32 newf)
826 {
827 struct net_device *dev;
828 struct inet6_dev *idev;
829
830 for_each_netdev(net, dev) {
831 idev = __in6_dev_get(dev);
832 if (idev) {
833 int changed = (!idev->cnf.forwarding) ^ (!newf);
834 idev->cnf.forwarding = newf;
835 if (changed)
836 dev_forward_change(idev);
837 }
838 }
839 }
840
841 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
842 {
843 struct net *net;
844 int old;
845
846 if (!rtnl_trylock())
847 return restart_syscall();
848
849 net = (struct net *)table->extra2;
850 old = *p;
851 *p = newf;
852
853 if (p == &net->ipv6.devconf_dflt->forwarding) {
854 if ((!newf) ^ (!old))
855 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
856 NETCONFA_FORWARDING,
857 NETCONFA_IFINDEX_DEFAULT,
858 net->ipv6.devconf_dflt);
859 rtnl_unlock();
860 return 0;
861 }
862
863 if (p == &net->ipv6.devconf_all->forwarding) {
864 int old_dflt = net->ipv6.devconf_dflt->forwarding;
865
866 net->ipv6.devconf_dflt->forwarding = newf;
867 if ((!newf) ^ (!old_dflt))
868 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
869 NETCONFA_FORWARDING,
870 NETCONFA_IFINDEX_DEFAULT,
871 net->ipv6.devconf_dflt);
872
873 addrconf_forward_change(net, newf);
874 if ((!newf) ^ (!old))
875 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
876 NETCONFA_FORWARDING,
877 NETCONFA_IFINDEX_ALL,
878 net->ipv6.devconf_all);
879 } else if ((!newf) ^ (!old))
880 dev_forward_change((struct inet6_dev *)table->extra1);
881 rtnl_unlock();
882
883 if (newf)
884 rt6_purge_dflt_routers(net);
885 return 1;
886 }
887
888 static void addrconf_linkdown_change(struct net *net, __s32 newf)
889 {
890 struct net_device *dev;
891 struct inet6_dev *idev;
892
893 for_each_netdev(net, dev) {
894 idev = __in6_dev_get(dev);
895 if (idev) {
896 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
897
898 idev->cnf.ignore_routes_with_linkdown = newf;
899 if (changed)
900 inet6_netconf_notify_devconf(dev_net(dev),
901 RTM_NEWNETCONF,
902 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
903 dev->ifindex,
904 &idev->cnf);
905 }
906 }
907 }
908
909 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
910 {
911 struct net *net;
912 int old;
913
914 if (!rtnl_trylock())
915 return restart_syscall();
916
917 net = (struct net *)table->extra2;
918 old = *p;
919 *p = newf;
920
921 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
922 if ((!newf) ^ (!old))
923 inet6_netconf_notify_devconf(net,
924 RTM_NEWNETCONF,
925 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
926 NETCONFA_IFINDEX_DEFAULT,
927 net->ipv6.devconf_dflt);
928 rtnl_unlock();
929 return 0;
930 }
931
932 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
933 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
934 addrconf_linkdown_change(net, newf);
935 if ((!newf) ^ (!old))
936 inet6_netconf_notify_devconf(net,
937 RTM_NEWNETCONF,
938 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
939 NETCONFA_IFINDEX_ALL,
940 net->ipv6.devconf_all);
941 }
942 rtnl_unlock();
943
944 return 1;
945 }
946
947 #endif
948
949 /* Nobody refers to this ifaddr, destroy it */
950 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
951 {
952 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
953
954 #ifdef NET_REFCNT_DEBUG
955 pr_debug("%s\n", __func__);
956 #endif
957
958 in6_dev_put(ifp->idev);
959
960 if (cancel_delayed_work(&ifp->dad_work))
961 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
962 ifp);
963
964 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
965 pr_warn("Freeing alive inet6 address %p\n", ifp);
966 return;
967 }
968
969 kfree_rcu(ifp, rcu);
970 }
971
972 static void
973 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
974 {
975 struct list_head *p;
976 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
977
978 /*
979 * Each device address list is sorted in order of scope -
980 * global before linklocal.
981 */
982 list_for_each(p, &idev->addr_list) {
983 struct inet6_ifaddr *ifa
984 = list_entry(p, struct inet6_ifaddr, if_list);
985 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
986 break;
987 }
988
989 list_add_tail_rcu(&ifp->if_list, p);
990 }
991
992 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
993 {
994 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
995
996 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
997 }
998
999 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1000 struct net_device *dev, unsigned int hash)
1001 {
1002 struct inet6_ifaddr *ifp;
1003
1004 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1005 if (!net_eq(dev_net(ifp->idev->dev), net))
1006 continue;
1007 if (ipv6_addr_equal(&ifp->addr, addr)) {
1008 if (!dev || ifp->idev->dev == dev)
1009 return true;
1010 }
1011 }
1012 return false;
1013 }
1014
1015 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1016 {
1017 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1018 int err = 0;
1019
1020 spin_lock(&addrconf_hash_lock);
1021
1022 /* Ignore adding duplicate addresses on an interface */
1023 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1024 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1025 err = -EEXIST;
1026 } else {
1027 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1028 }
1029
1030 spin_unlock(&addrconf_hash_lock);
1031
1032 return err;
1033 }
1034
1035 /* On success it returns ifp with increased reference count */
1036
1037 static struct inet6_ifaddr *
1038 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1039 bool can_block, struct netlink_ext_ack *extack)
1040 {
1041 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1042 int addr_type = ipv6_addr_type(cfg->pfx);
1043 struct net *net = dev_net(idev->dev);
1044 struct inet6_ifaddr *ifa = NULL;
1045 struct fib6_info *f6i = NULL;
1046 int err = 0;
1047
1048 if (addr_type == IPV6_ADDR_ANY ||
1049 addr_type & IPV6_ADDR_MULTICAST ||
1050 (!(idev->dev->flags & IFF_LOOPBACK) &&
1051 !netif_is_l3_master(idev->dev) &&
1052 addr_type & IPV6_ADDR_LOOPBACK))
1053 return ERR_PTR(-EADDRNOTAVAIL);
1054
1055 if (idev->dead) {
1056 err = -ENODEV; /*XXX*/
1057 goto out;
1058 }
1059
1060 if (idev->cnf.disable_ipv6) {
1061 err = -EACCES;
1062 goto out;
1063 }
1064
1065 /* validator notifier needs to be blocking;
1066 * do not call in atomic context
1067 */
1068 if (can_block) {
1069 struct in6_validator_info i6vi = {
1070 .i6vi_addr = *cfg->pfx,
1071 .i6vi_dev = idev,
1072 .extack = extack,
1073 };
1074
1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1076 err = notifier_to_errno(err);
1077 if (err < 0)
1078 goto out;
1079 }
1080
1081 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1082 if (!ifa) {
1083 err = -ENOBUFS;
1084 goto out;
1085 }
1086
1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1088 if (IS_ERR(f6i)) {
1089 err = PTR_ERR(f6i);
1090 f6i = NULL;
1091 goto out;
1092 }
1093
1094 if (net->ipv6.devconf_all->disable_policy ||
1095 idev->cnf.disable_policy)
1096 f6i->dst_nopolicy = true;
1097
1098 neigh_parms_data_state_setall(idev->nd_parms);
1099
1100 ifa->addr = *cfg->pfx;
1101 if (cfg->peer_pfx)
1102 ifa->peer_addr = *cfg->peer_pfx;
1103
1104 spin_lock_init(&ifa->lock);
1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1106 INIT_HLIST_NODE(&ifa->addr_lst);
1107 ifa->scope = cfg->scope;
1108 ifa->prefix_len = cfg->plen;
1109 ifa->rt_priority = cfg->rt_priority;
1110 ifa->flags = cfg->ifa_flags;
1111 /* No need to add the TENTATIVE flag for addresses with NODAD */
1112 if (!(cfg->ifa_flags & IFA_F_NODAD))
1113 ifa->flags |= IFA_F_TENTATIVE;
1114 ifa->valid_lft = cfg->valid_lft;
1115 ifa->prefered_lft = cfg->preferred_lft;
1116 ifa->cstamp = ifa->tstamp = jiffies;
1117 ifa->tokenized = false;
1118
1119 ifa->rt = f6i;
1120
1121 ifa->idev = idev;
1122 in6_dev_hold(idev);
1123
1124 /* For caller */
1125 refcount_set(&ifa->refcnt, 1);
1126
1127 rcu_read_lock_bh();
1128
1129 err = ipv6_add_addr_hash(idev->dev, ifa);
1130 if (err < 0) {
1131 rcu_read_unlock_bh();
1132 goto out;
1133 }
1134
1135 write_lock(&idev->lock);
1136
1137 /* Add to inet6_dev unicast addr list. */
1138 ipv6_link_dev_addr(idev, ifa);
1139
1140 if (ifa->flags&IFA_F_TEMPORARY) {
1141 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1142 in6_ifa_hold(ifa);
1143 }
1144
1145 in6_ifa_hold(ifa);
1146 write_unlock(&idev->lock);
1147
1148 rcu_read_unlock_bh();
1149
1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1151 out:
1152 if (unlikely(err < 0)) {
1153 fib6_info_release(f6i);
1154
1155 if (ifa) {
1156 if (ifa->idev)
1157 in6_dev_put(ifa->idev);
1158 kfree(ifa);
1159 }
1160 ifa = ERR_PTR(err);
1161 }
1162
1163 return ifa;
1164 }
1165
1166 enum cleanup_prefix_rt_t {
1167 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1168 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1169 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1170 };
1171
1172 /*
1173 * Check, whether the prefix for ifp would still need a prefix route
1174 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1175 * constants.
1176 *
1177 * 1) we don't purge prefix if address was not permanent.
1178 * prefix is managed by its own lifetime.
1179 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1180 * 3) if there are no addresses, delete prefix.
1181 * 4) if there are still other permanent address(es),
1182 * corresponding prefix is still permanent.
1183 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1184 * don't purge the prefix, assume user space is managing it.
1185 * 6) otherwise, update prefix lifetime to the
1186 * longest valid lifetime among the corresponding
1187 * addresses on the device.
1188 * Note: subsequent RA will update lifetime.
1189 **/
1190 static enum cleanup_prefix_rt_t
1191 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1192 {
1193 struct inet6_ifaddr *ifa;
1194 struct inet6_dev *idev = ifp->idev;
1195 unsigned long lifetime;
1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1197
1198 *expires = jiffies;
1199
1200 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1201 if (ifa == ifp)
1202 continue;
1203 if (ifa->prefix_len != ifp->prefix_len ||
1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1205 ifp->prefix_len))
1206 continue;
1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1208 return CLEANUP_PREFIX_RT_NOP;
1209
1210 action = CLEANUP_PREFIX_RT_EXPIRE;
1211
1212 spin_lock(&ifa->lock);
1213
1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1215 /*
1216 * Note: Because this address is
1217 * not permanent, lifetime <
1218 * LONG_MAX / HZ here.
1219 */
1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1221 *expires = ifa->tstamp + lifetime * HZ;
1222 spin_unlock(&ifa->lock);
1223 }
1224
1225 return action;
1226 }
1227
1228 static void
1229 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1230 {
1231 struct fib6_info *f6i;
1232
1233 f6i = addrconf_get_prefix_route(&ifp->addr,
1234 ifp->prefix_len,
1235 ifp->idev->dev,
1236 0, RTF_GATEWAY | RTF_DEFAULT);
1237 if (f6i) {
1238 if (del_rt)
1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
1240 else {
1241 if (!(f6i->fib6_flags & RTF_EXPIRES))
1242 fib6_set_expires(f6i, expires);
1243 fib6_info_release(f6i);
1244 }
1245 }
1246 }
1247
1248
1249 /* This function wants to get referenced ifp and releases it before return */
1250
1251 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1252 {
1253 int state;
1254 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1255 unsigned long expires;
1256
1257 ASSERT_RTNL();
1258
1259 spin_lock_bh(&ifp->lock);
1260 state = ifp->state;
1261 ifp->state = INET6_IFADDR_STATE_DEAD;
1262 spin_unlock_bh(&ifp->lock);
1263
1264 if (state == INET6_IFADDR_STATE_DEAD)
1265 goto out;
1266
1267 spin_lock_bh(&addrconf_hash_lock);
1268 hlist_del_init_rcu(&ifp->addr_lst);
1269 spin_unlock_bh(&addrconf_hash_lock);
1270
1271 write_lock_bh(&ifp->idev->lock);
1272
1273 if (ifp->flags&IFA_F_TEMPORARY) {
1274 list_del(&ifp->tmp_list);
1275 if (ifp->ifpub) {
1276 in6_ifa_put(ifp->ifpub);
1277 ifp->ifpub = NULL;
1278 }
1279 __in6_ifa_put(ifp);
1280 }
1281
1282 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1283 action = check_cleanup_prefix_route(ifp, &expires);
1284
1285 list_del_rcu(&ifp->if_list);
1286 __in6_ifa_put(ifp);
1287
1288 write_unlock_bh(&ifp->idev->lock);
1289
1290 addrconf_del_dad_work(ifp);
1291
1292 ipv6_ifa_notify(RTM_DELADDR, ifp);
1293
1294 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1295
1296 if (action != CLEANUP_PREFIX_RT_NOP) {
1297 cleanup_prefix_route(ifp, expires,
1298 action == CLEANUP_PREFIX_RT_DEL);
1299 }
1300
1301 /* clean up prefsrc entries */
1302 rt6_remove_prefsrc(ifp);
1303 out:
1304 in6_ifa_put(ifp);
1305 }
1306
1307 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1308 struct inet6_ifaddr *ift,
1309 bool block)
1310 {
1311 struct inet6_dev *idev = ifp->idev;
1312 struct in6_addr addr, *tmpaddr;
1313 unsigned long tmp_tstamp, age;
1314 unsigned long regen_advance;
1315 struct ifa6_config cfg;
1316 int ret = 0;
1317 unsigned long now = jiffies;
1318 long max_desync_factor;
1319 s32 cnf_temp_preferred_lft;
1320
1321 write_lock_bh(&idev->lock);
1322 if (ift) {
1323 spin_lock_bh(&ift->lock);
1324 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1325 spin_unlock_bh(&ift->lock);
1326 tmpaddr = &addr;
1327 } else {
1328 tmpaddr = NULL;
1329 }
1330 retry:
1331 in6_dev_hold(idev);
1332 if (idev->cnf.use_tempaddr <= 0) {
1333 write_unlock_bh(&idev->lock);
1334 pr_info("%s: use_tempaddr is disabled\n", __func__);
1335 in6_dev_put(idev);
1336 ret = -1;
1337 goto out;
1338 }
1339 spin_lock_bh(&ifp->lock);
1340 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1341 idev->cnf.use_tempaddr = -1; /*XXX*/
1342 spin_unlock_bh(&ifp->lock);
1343 write_unlock_bh(&idev->lock);
1344 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1345 __func__);
1346 in6_dev_put(idev);
1347 ret = -1;
1348 goto out;
1349 }
1350 in6_ifa_hold(ifp);
1351 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1352 ipv6_try_regen_rndid(idev, tmpaddr);
1353 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1354 age = (now - ifp->tstamp) / HZ;
1355
1356 regen_advance = idev->cnf.regen_max_retry *
1357 idev->cnf.dad_transmits *
1358 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1359
1360 /* recalculate max_desync_factor each time and update
1361 * idev->desync_factor if it's larger
1362 */
1363 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1364 max_desync_factor = min_t(__u32,
1365 idev->cnf.max_desync_factor,
1366 cnf_temp_preferred_lft - regen_advance);
1367
1368 if (unlikely(idev->desync_factor > max_desync_factor)) {
1369 if (max_desync_factor > 0) {
1370 get_random_bytes(&idev->desync_factor,
1371 sizeof(idev->desync_factor));
1372 idev->desync_factor %= max_desync_factor;
1373 } else {
1374 idev->desync_factor = 0;
1375 }
1376 }
1377
1378 memset(&cfg, 0, sizeof(cfg));
1379 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1380 idev->cnf.temp_valid_lft + age);
1381 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1382 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1383
1384 cfg.plen = ifp->prefix_len;
1385 tmp_tstamp = ifp->tstamp;
1386 spin_unlock_bh(&ifp->lock);
1387
1388 write_unlock_bh(&idev->lock);
1389
1390 /* A temporary address is created only if this calculated Preferred
1391 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1392 * an implementation must not create a temporary address with a zero
1393 * Preferred Lifetime.
1394 * Use age calculation as in addrconf_verify to avoid unnecessary
1395 * temporary addresses being generated.
1396 */
1397 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1398 if (cfg.preferred_lft <= regen_advance + age) {
1399 in6_ifa_put(ifp);
1400 in6_dev_put(idev);
1401 ret = -1;
1402 goto out;
1403 }
1404
1405 cfg.ifa_flags = IFA_F_TEMPORARY;
1406 /* set in addrconf_prefix_rcv() */
1407 if (ifp->flags & IFA_F_OPTIMISTIC)
1408 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1409
1410 cfg.pfx = &addr;
1411 cfg.scope = ipv6_addr_scope(cfg.pfx);
1412
1413 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1414 if (IS_ERR(ift)) {
1415 in6_ifa_put(ifp);
1416 in6_dev_put(idev);
1417 pr_info("%s: retry temporary address regeneration\n", __func__);
1418 tmpaddr = &addr;
1419 write_lock_bh(&idev->lock);
1420 goto retry;
1421 }
1422
1423 spin_lock_bh(&ift->lock);
1424 ift->ifpub = ifp;
1425 ift->cstamp = now;
1426 ift->tstamp = tmp_tstamp;
1427 spin_unlock_bh(&ift->lock);
1428
1429 addrconf_dad_start(ift);
1430 in6_ifa_put(ift);
1431 in6_dev_put(idev);
1432 out:
1433 return ret;
1434 }
1435
1436 /*
1437 * Choose an appropriate source address (RFC3484)
1438 */
1439 enum {
1440 IPV6_SADDR_RULE_INIT = 0,
1441 IPV6_SADDR_RULE_LOCAL,
1442 IPV6_SADDR_RULE_SCOPE,
1443 IPV6_SADDR_RULE_PREFERRED,
1444 #ifdef CONFIG_IPV6_MIP6
1445 IPV6_SADDR_RULE_HOA,
1446 #endif
1447 IPV6_SADDR_RULE_OIF,
1448 IPV6_SADDR_RULE_LABEL,
1449 IPV6_SADDR_RULE_PRIVACY,
1450 IPV6_SADDR_RULE_ORCHID,
1451 IPV6_SADDR_RULE_PREFIX,
1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1453 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1454 #endif
1455 IPV6_SADDR_RULE_MAX
1456 };
1457
1458 struct ipv6_saddr_score {
1459 int rule;
1460 int addr_type;
1461 struct inet6_ifaddr *ifa;
1462 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1463 int scopedist;
1464 int matchlen;
1465 };
1466
1467 struct ipv6_saddr_dst {
1468 const struct in6_addr *addr;
1469 int ifindex;
1470 int scope;
1471 int label;
1472 unsigned int prefs;
1473 };
1474
1475 static inline int ipv6_saddr_preferred(int type)
1476 {
1477 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1478 return 1;
1479 return 0;
1480 }
1481
1482 static bool ipv6_use_optimistic_addr(struct net *net,
1483 struct inet6_dev *idev)
1484 {
1485 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1486 if (!idev)
1487 return false;
1488 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1489 return false;
1490 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1491 return false;
1492
1493 return true;
1494 #else
1495 return false;
1496 #endif
1497 }
1498
1499 static bool ipv6_allow_optimistic_dad(struct net *net,
1500 struct inet6_dev *idev)
1501 {
1502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1503 if (!idev)
1504 return false;
1505 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1506 return false;
1507
1508 return true;
1509 #else
1510 return false;
1511 #endif
1512 }
1513
1514 static int ipv6_get_saddr_eval(struct net *net,
1515 struct ipv6_saddr_score *score,
1516 struct ipv6_saddr_dst *dst,
1517 int i)
1518 {
1519 int ret;
1520
1521 if (i <= score->rule) {
1522 switch (i) {
1523 case IPV6_SADDR_RULE_SCOPE:
1524 ret = score->scopedist;
1525 break;
1526 case IPV6_SADDR_RULE_PREFIX:
1527 ret = score->matchlen;
1528 break;
1529 default:
1530 ret = !!test_bit(i, score->scorebits);
1531 }
1532 goto out;
1533 }
1534
1535 switch (i) {
1536 case IPV6_SADDR_RULE_INIT:
1537 /* Rule 0: remember if hiscore is not ready yet */
1538 ret = !!score->ifa;
1539 break;
1540 case IPV6_SADDR_RULE_LOCAL:
1541 /* Rule 1: Prefer same address */
1542 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1543 break;
1544 case IPV6_SADDR_RULE_SCOPE:
1545 /* Rule 2: Prefer appropriate scope
1546 *
1547 * ret
1548 * ^
1549 * -1 | d 15
1550 * ---+--+-+---> scope
1551 * |
1552 * | d is scope of the destination.
1553 * B-d | \
1554 * | \ <- smaller scope is better if
1555 * B-15 | \ if scope is enough for destination.
1556 * | ret = B - scope (-1 <= scope >= d <= 15).
1557 * d-C-1 | /
1558 * |/ <- greater is better
1559 * -C / if scope is not enough for destination.
1560 * /| ret = scope - C (-1 <= d < scope <= 15).
1561 *
1562 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1563 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1564 * Assume B = 0 and we get C > 29.
1565 */
1566 ret = __ipv6_addr_src_scope(score->addr_type);
1567 if (ret >= dst->scope)
1568 ret = -ret;
1569 else
1570 ret -= 128; /* 30 is enough */
1571 score->scopedist = ret;
1572 break;
1573 case IPV6_SADDR_RULE_PREFERRED:
1574 {
1575 /* Rule 3: Avoid deprecated and optimistic addresses */
1576 u8 avoid = IFA_F_DEPRECATED;
1577
1578 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1579 avoid |= IFA_F_OPTIMISTIC;
1580 ret = ipv6_saddr_preferred(score->addr_type) ||
1581 !(score->ifa->flags & avoid);
1582 break;
1583 }
1584 #ifdef CONFIG_IPV6_MIP6
1585 case IPV6_SADDR_RULE_HOA:
1586 {
1587 /* Rule 4: Prefer home address */
1588 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1589 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1590 break;
1591 }
1592 #endif
1593 case IPV6_SADDR_RULE_OIF:
1594 /* Rule 5: Prefer outgoing interface */
1595 ret = (!dst->ifindex ||
1596 dst->ifindex == score->ifa->idev->dev->ifindex);
1597 break;
1598 case IPV6_SADDR_RULE_LABEL:
1599 /* Rule 6: Prefer matching label */
1600 ret = ipv6_addr_label(net,
1601 &score->ifa->addr, score->addr_type,
1602 score->ifa->idev->dev->ifindex) == dst->label;
1603 break;
1604 case IPV6_SADDR_RULE_PRIVACY:
1605 {
1606 /* Rule 7: Prefer public address
1607 * Note: prefer temporary address if use_tempaddr >= 2
1608 */
1609 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1610 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1611 score->ifa->idev->cnf.use_tempaddr >= 2;
1612 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1613 break;
1614 }
1615 case IPV6_SADDR_RULE_ORCHID:
1616 /* Rule 8-: Prefer ORCHID vs ORCHID or
1617 * non-ORCHID vs non-ORCHID
1618 */
1619 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1620 ipv6_addr_orchid(dst->addr));
1621 break;
1622 case IPV6_SADDR_RULE_PREFIX:
1623 /* Rule 8: Use longest matching prefix */
1624 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1625 if (ret > score->ifa->prefix_len)
1626 ret = score->ifa->prefix_len;
1627 score->matchlen = ret;
1628 break;
1629 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1630 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1631 /* Optimistic addresses still have lower precedence than other
1632 * preferred addresses.
1633 */
1634 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1635 break;
1636 #endif
1637 default:
1638 ret = 0;
1639 }
1640
1641 if (ret)
1642 __set_bit(i, score->scorebits);
1643 score->rule = i;
1644 out:
1645 return ret;
1646 }
1647
1648 static int __ipv6_dev_get_saddr(struct net *net,
1649 struct ipv6_saddr_dst *dst,
1650 struct inet6_dev *idev,
1651 struct ipv6_saddr_score *scores,
1652 int hiscore_idx)
1653 {
1654 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1655
1656 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1657 int i;
1658
1659 /*
1660 * - Tentative Address (RFC2462 section 5.4)
1661 * - A tentative address is not considered
1662 * "assigned to an interface" in the traditional
1663 * sense, unless it is also flagged as optimistic.
1664 * - Candidate Source Address (section 4)
1665 * - In any case, anycast addresses, multicast
1666 * addresses, and the unspecified address MUST
1667 * NOT be included in a candidate set.
1668 */
1669 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1670 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1671 continue;
1672
1673 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1674
1675 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1676 score->addr_type & IPV6_ADDR_MULTICAST)) {
1677 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1678 idev->dev->name);
1679 continue;
1680 }
1681
1682 score->rule = -1;
1683 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1684
1685 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1686 int minihiscore, miniscore;
1687
1688 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1689 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1690
1691 if (minihiscore > miniscore) {
1692 if (i == IPV6_SADDR_RULE_SCOPE &&
1693 score->scopedist > 0) {
1694 /*
1695 * special case:
1696 * each remaining entry
1697 * has too small (not enough)
1698 * scope, because ifa entries
1699 * are sorted by their scope
1700 * values.
1701 */
1702 goto out;
1703 }
1704 break;
1705 } else if (minihiscore < miniscore) {
1706 swap(hiscore, score);
1707 hiscore_idx = 1 - hiscore_idx;
1708
1709 /* restore our iterator */
1710 score->ifa = hiscore->ifa;
1711
1712 break;
1713 }
1714 }
1715 }
1716 out:
1717 return hiscore_idx;
1718 }
1719
1720 static int ipv6_get_saddr_master(struct net *net,
1721 const struct net_device *dst_dev,
1722 const struct net_device *master,
1723 struct ipv6_saddr_dst *dst,
1724 struct ipv6_saddr_score *scores,
1725 int hiscore_idx)
1726 {
1727 struct inet6_dev *idev;
1728
1729 idev = __in6_dev_get(dst_dev);
1730 if (idev)
1731 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1732 scores, hiscore_idx);
1733
1734 idev = __in6_dev_get(master);
1735 if (idev)
1736 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1737 scores, hiscore_idx);
1738
1739 return hiscore_idx;
1740 }
1741
1742 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1743 const struct in6_addr *daddr, unsigned int prefs,
1744 struct in6_addr *saddr)
1745 {
1746 struct ipv6_saddr_score scores[2], *hiscore;
1747 struct ipv6_saddr_dst dst;
1748 struct inet6_dev *idev;
1749 struct net_device *dev;
1750 int dst_type;
1751 bool use_oif_addr = false;
1752 int hiscore_idx = 0;
1753 int ret = 0;
1754
1755 dst_type = __ipv6_addr_type(daddr);
1756 dst.addr = daddr;
1757 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1758 dst.scope = __ipv6_addr_src_scope(dst_type);
1759 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1760 dst.prefs = prefs;
1761
1762 scores[hiscore_idx].rule = -1;
1763 scores[hiscore_idx].ifa = NULL;
1764
1765 rcu_read_lock();
1766
1767 /* Candidate Source Address (section 4)
1768 * - multicast and link-local destination address,
1769 * the set of candidate source address MUST only
1770 * include addresses assigned to interfaces
1771 * belonging to the same link as the outgoing
1772 * interface.
1773 * (- For site-local destination addresses, the
1774 * set of candidate source addresses MUST only
1775 * include addresses assigned to interfaces
1776 * belonging to the same site as the outgoing
1777 * interface.)
1778 * - "It is RECOMMENDED that the candidate source addresses
1779 * be the set of unicast addresses assigned to the
1780 * interface that will be used to send to the destination
1781 * (the 'outgoing' interface)." (RFC 6724)
1782 */
1783 if (dst_dev) {
1784 idev = __in6_dev_get(dst_dev);
1785 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1786 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1787 (idev && idev->cnf.use_oif_addrs_only)) {
1788 use_oif_addr = true;
1789 }
1790 }
1791
1792 if (use_oif_addr) {
1793 if (idev)
1794 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1795 } else {
1796 const struct net_device *master;
1797 int master_idx = 0;
1798
1799 /* if dst_dev exists and is enslaved to an L3 device, then
1800 * prefer addresses from dst_dev and then the master over
1801 * any other enslaved devices in the L3 domain.
1802 */
1803 master = l3mdev_master_dev_rcu(dst_dev);
1804 if (master) {
1805 master_idx = master->ifindex;
1806
1807 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1808 master, &dst,
1809 scores, hiscore_idx);
1810
1811 if (scores[hiscore_idx].ifa)
1812 goto out;
1813 }
1814
1815 for_each_netdev_rcu(net, dev) {
1816 /* only consider addresses on devices in the
1817 * same L3 domain
1818 */
1819 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1820 continue;
1821 idev = __in6_dev_get(dev);
1822 if (!idev)
1823 continue;
1824 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1825 }
1826 }
1827
1828 out:
1829 hiscore = &scores[hiscore_idx];
1830 if (!hiscore->ifa)
1831 ret = -EADDRNOTAVAIL;
1832 else
1833 *saddr = hiscore->ifa->addr;
1834
1835 rcu_read_unlock();
1836 return ret;
1837 }
1838 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1839
1840 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1841 u32 banned_flags)
1842 {
1843 struct inet6_ifaddr *ifp;
1844 int err = -EADDRNOTAVAIL;
1845
1846 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1847 if (ifp->scope > IFA_LINK)
1848 break;
1849 if (ifp->scope == IFA_LINK &&
1850 !(ifp->flags & banned_flags)) {
1851 *addr = ifp->addr;
1852 err = 0;
1853 break;
1854 }
1855 }
1856 return err;
1857 }
1858
1859 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1860 u32 banned_flags)
1861 {
1862 struct inet6_dev *idev;
1863 int err = -EADDRNOTAVAIL;
1864
1865 rcu_read_lock();
1866 idev = __in6_dev_get(dev);
1867 if (idev) {
1868 read_lock_bh(&idev->lock);
1869 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1870 read_unlock_bh(&idev->lock);
1871 }
1872 rcu_read_unlock();
1873 return err;
1874 }
1875
1876 static int ipv6_count_addresses(const struct inet6_dev *idev)
1877 {
1878 const struct inet6_ifaddr *ifp;
1879 int cnt = 0;
1880
1881 rcu_read_lock();
1882 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1883 cnt++;
1884 rcu_read_unlock();
1885 return cnt;
1886 }
1887
1888 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1889 const struct net_device *dev, int strict)
1890 {
1891 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1892 strict, IFA_F_TENTATIVE);
1893 }
1894 EXPORT_SYMBOL(ipv6_chk_addr);
1895
1896 /* device argument is used to find the L3 domain of interest. If
1897 * skip_dev_check is set, then the ifp device is not checked against
1898 * the passed in dev argument. So the 2 cases for addresses checks are:
1899 * 1. does the address exist in the L3 domain that dev is part of
1900 * (skip_dev_check = true), or
1901 *
1902 * 2. does the address exist on the specific device
1903 * (skip_dev_check = false)
1904 */
1905 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1906 const struct net_device *dev, bool skip_dev_check,
1907 int strict, u32 banned_flags)
1908 {
1909 unsigned int hash = inet6_addr_hash(net, addr);
1910 const struct net_device *l3mdev;
1911 struct inet6_ifaddr *ifp;
1912 u32 ifp_flags;
1913
1914 rcu_read_lock();
1915
1916 l3mdev = l3mdev_master_dev_rcu(dev);
1917 if (skip_dev_check)
1918 dev = NULL;
1919
1920 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1921 if (!net_eq(dev_net(ifp->idev->dev), net))
1922 continue;
1923
1924 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1925 continue;
1926
1927 /* Decouple optimistic from tentative for evaluation here.
1928 * Ban optimistic addresses explicitly, when required.
1929 */
1930 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1931 ? (ifp->flags&~IFA_F_TENTATIVE)
1932 : ifp->flags;
1933 if (ipv6_addr_equal(&ifp->addr, addr) &&
1934 !(ifp_flags&banned_flags) &&
1935 (!dev || ifp->idev->dev == dev ||
1936 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1937 rcu_read_unlock();
1938 return 1;
1939 }
1940 }
1941
1942 rcu_read_unlock();
1943 return 0;
1944 }
1945 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1946
1947
1948 /* Compares an address/prefix_len with addresses on device @dev.
1949 * If one is found it returns true.
1950 */
1951 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1952 const unsigned int prefix_len, struct net_device *dev)
1953 {
1954 const struct inet6_ifaddr *ifa;
1955 const struct inet6_dev *idev;
1956 bool ret = false;
1957
1958 rcu_read_lock();
1959 idev = __in6_dev_get(dev);
1960 if (idev) {
1961 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1962 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1963 if (ret)
1964 break;
1965 }
1966 }
1967 rcu_read_unlock();
1968
1969 return ret;
1970 }
1971 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1972
1973 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1974 {
1975 const struct inet6_ifaddr *ifa;
1976 const struct inet6_dev *idev;
1977 int onlink;
1978
1979 onlink = 0;
1980 rcu_read_lock();
1981 idev = __in6_dev_get(dev);
1982 if (idev) {
1983 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1984 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1985 ifa->prefix_len);
1986 if (onlink)
1987 break;
1988 }
1989 }
1990 rcu_read_unlock();
1991 return onlink;
1992 }
1993 EXPORT_SYMBOL(ipv6_chk_prefix);
1994
1995 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1996 struct net_device *dev, int strict)
1997 {
1998 unsigned int hash = inet6_addr_hash(net, addr);
1999 struct inet6_ifaddr *ifp, *result = NULL;
2000
2001 rcu_read_lock();
2002 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2003 if (!net_eq(dev_net(ifp->idev->dev), net))
2004 continue;
2005 if (ipv6_addr_equal(&ifp->addr, addr)) {
2006 if (!dev || ifp->idev->dev == dev ||
2007 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2008 result = ifp;
2009 in6_ifa_hold(ifp);
2010 break;
2011 }
2012 }
2013 }
2014 rcu_read_unlock();
2015
2016 return result;
2017 }
2018
2019 /* Gets referenced address, destroys ifaddr */
2020
2021 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2022 {
2023 if (dad_failed)
2024 ifp->flags |= IFA_F_DADFAILED;
2025
2026 if (ifp->flags&IFA_F_TEMPORARY) {
2027 struct inet6_ifaddr *ifpub;
2028 spin_lock_bh(&ifp->lock);
2029 ifpub = ifp->ifpub;
2030 if (ifpub) {
2031 in6_ifa_hold(ifpub);
2032 spin_unlock_bh(&ifp->lock);
2033 ipv6_create_tempaddr(ifpub, ifp, true);
2034 in6_ifa_put(ifpub);
2035 } else {
2036 spin_unlock_bh(&ifp->lock);
2037 }
2038 ipv6_del_addr(ifp);
2039 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2040 spin_lock_bh(&ifp->lock);
2041 addrconf_del_dad_work(ifp);
2042 ifp->flags |= IFA_F_TENTATIVE;
2043 if (dad_failed)
2044 ifp->flags &= ~IFA_F_OPTIMISTIC;
2045 spin_unlock_bh(&ifp->lock);
2046 if (dad_failed)
2047 ipv6_ifa_notify(0, ifp);
2048 in6_ifa_put(ifp);
2049 } else {
2050 ipv6_del_addr(ifp);
2051 }
2052 }
2053
2054 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2055 {
2056 int err = -ENOENT;
2057
2058 spin_lock_bh(&ifp->lock);
2059 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2060 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2061 err = 0;
2062 }
2063 spin_unlock_bh(&ifp->lock);
2064
2065 return err;
2066 }
2067
2068 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2069 {
2070 struct inet6_dev *idev = ifp->idev;
2071 struct net *net = dev_net(ifp->idev->dev);
2072
2073 if (addrconf_dad_end(ifp)) {
2074 in6_ifa_put(ifp);
2075 return;
2076 }
2077
2078 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2079 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2080
2081 spin_lock_bh(&ifp->lock);
2082
2083 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2084 struct in6_addr new_addr;
2085 struct inet6_ifaddr *ifp2;
2086 int retries = ifp->stable_privacy_retry + 1;
2087 struct ifa6_config cfg = {
2088 .pfx = &new_addr,
2089 .plen = ifp->prefix_len,
2090 .ifa_flags = ifp->flags,
2091 .valid_lft = ifp->valid_lft,
2092 .preferred_lft = ifp->prefered_lft,
2093 .scope = ifp->scope,
2094 };
2095
2096 if (retries > net->ipv6.sysctl.idgen_retries) {
2097 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2098 ifp->idev->dev->name);
2099 goto errdad;
2100 }
2101
2102 new_addr = ifp->addr;
2103 if (ipv6_generate_stable_address(&new_addr, retries,
2104 idev))
2105 goto errdad;
2106
2107 spin_unlock_bh(&ifp->lock);
2108
2109 if (idev->cnf.max_addresses &&
2110 ipv6_count_addresses(idev) >=
2111 idev->cnf.max_addresses)
2112 goto lock_errdad;
2113
2114 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2115 ifp->idev->dev->name);
2116
2117 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2118 if (IS_ERR(ifp2))
2119 goto lock_errdad;
2120
2121 spin_lock_bh(&ifp2->lock);
2122 ifp2->stable_privacy_retry = retries;
2123 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2124 spin_unlock_bh(&ifp2->lock);
2125
2126 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2127 in6_ifa_put(ifp2);
2128 lock_errdad:
2129 spin_lock_bh(&ifp->lock);
2130 }
2131
2132 errdad:
2133 /* transition from _POSTDAD to _ERRDAD */
2134 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2135 spin_unlock_bh(&ifp->lock);
2136
2137 addrconf_mod_dad_work(ifp, 0);
2138 in6_ifa_put(ifp);
2139 }
2140
2141 /* Join to solicited addr multicast group.
2142 * caller must hold RTNL */
2143 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2144 {
2145 struct in6_addr maddr;
2146
2147 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2148 return;
2149
2150 addrconf_addr_solict_mult(addr, &maddr);
2151 ipv6_dev_mc_inc(dev, &maddr);
2152 }
2153
2154 /* caller must hold RTNL */
2155 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2156 {
2157 struct in6_addr maddr;
2158
2159 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2160 return;
2161
2162 addrconf_addr_solict_mult(addr, &maddr);
2163 __ipv6_dev_mc_dec(idev, &maddr);
2164 }
2165
2166 /* caller must hold RTNL */
2167 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2168 {
2169 struct in6_addr addr;
2170
2171 if (ifp->prefix_len >= 127) /* RFC 6164 */
2172 return;
2173 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2174 if (ipv6_addr_any(&addr))
2175 return;
2176 __ipv6_dev_ac_inc(ifp->idev, &addr);
2177 }
2178
2179 /* caller must hold RTNL */
2180 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2181 {
2182 struct in6_addr addr;
2183
2184 if (ifp->prefix_len >= 127) /* RFC 6164 */
2185 return;
2186 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2187 if (ipv6_addr_any(&addr))
2188 return;
2189 __ipv6_dev_ac_dec(ifp->idev, &addr);
2190 }
2191
2192 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2193 {
2194 switch (dev->addr_len) {
2195 case ETH_ALEN:
2196 memcpy(eui, dev->dev_addr, 3);
2197 eui[3] = 0xFF;
2198 eui[4] = 0xFE;
2199 memcpy(eui + 5, dev->dev_addr + 3, 3);
2200 break;
2201 case EUI64_ADDR_LEN:
2202 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2203 eui[0] ^= 2;
2204 break;
2205 default:
2206 return -1;
2207 }
2208
2209 return 0;
2210 }
2211
2212 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2213 {
2214 union fwnet_hwaddr *ha;
2215
2216 if (dev->addr_len != FWNET_ALEN)
2217 return -1;
2218
2219 ha = (union fwnet_hwaddr *)dev->dev_addr;
2220
2221 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2222 eui[0] ^= 2;
2223 return 0;
2224 }
2225
2226 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2227 {
2228 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2229 if (dev->addr_len != ARCNET_ALEN)
2230 return -1;
2231 memset(eui, 0, 7);
2232 eui[7] = *(u8 *)dev->dev_addr;
2233 return 0;
2234 }
2235
2236 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2237 {
2238 if (dev->addr_len != INFINIBAND_ALEN)
2239 return -1;
2240 memcpy(eui, dev->dev_addr + 12, 8);
2241 eui[0] |= 2;
2242 return 0;
2243 }
2244
2245 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2246 {
2247 if (addr == 0)
2248 return -1;
2249 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2250 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2251 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2252 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2253 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2254 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2255 eui[1] = 0;
2256 eui[2] = 0x5E;
2257 eui[3] = 0xFE;
2258 memcpy(eui + 4, &addr, 4);
2259 return 0;
2260 }
2261
2262 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2263 {
2264 if (dev->priv_flags & IFF_ISATAP)
2265 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2266 return -1;
2267 }
2268
2269 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2270 {
2271 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2272 }
2273
2274 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2275 {
2276 memcpy(eui, dev->perm_addr, 3);
2277 memcpy(eui + 5, dev->perm_addr + 3, 3);
2278 eui[3] = 0xFF;
2279 eui[4] = 0xFE;
2280 eui[0] ^= 2;
2281 return 0;
2282 }
2283
2284 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2285 {
2286 switch (dev->type) {
2287 case ARPHRD_ETHER:
2288 case ARPHRD_FDDI:
2289 return addrconf_ifid_eui48(eui, dev);
2290 case ARPHRD_ARCNET:
2291 return addrconf_ifid_arcnet(eui, dev);
2292 case ARPHRD_INFINIBAND:
2293 return addrconf_ifid_infiniband(eui, dev);
2294 case ARPHRD_SIT:
2295 return addrconf_ifid_sit(eui, dev);
2296 case ARPHRD_IPGRE:
2297 case ARPHRD_TUNNEL:
2298 return addrconf_ifid_gre(eui, dev);
2299 case ARPHRD_6LOWPAN:
2300 return addrconf_ifid_6lowpan(eui, dev);
2301 case ARPHRD_IEEE1394:
2302 return addrconf_ifid_ieee1394(eui, dev);
2303 case ARPHRD_TUNNEL6:
2304 case ARPHRD_IP6GRE:
2305 case ARPHRD_RAWIP:
2306 return addrconf_ifid_ip6tnl(eui, dev);
2307 }
2308 return -1;
2309 }
2310
2311 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2312 {
2313 int err = -1;
2314 struct inet6_ifaddr *ifp;
2315
2316 read_lock_bh(&idev->lock);
2317 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2318 if (ifp->scope > IFA_LINK)
2319 break;
2320 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2321 memcpy(eui, ifp->addr.s6_addr+8, 8);
2322 err = 0;
2323 break;
2324 }
2325 }
2326 read_unlock_bh(&idev->lock);
2327 return err;
2328 }
2329
2330 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2331 static void ipv6_regen_rndid(struct inet6_dev *idev)
2332 {
2333 regen:
2334 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2335 idev->rndid[0] &= ~0x02;
2336
2337 /*
2338 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2339 * check if generated address is not inappropriate
2340 *
2341 * - Reserved subnet anycast (RFC 2526)
2342 * 11111101 11....11 1xxxxxxx
2343 * - ISATAP (RFC4214) 6.1
2344 * 00-00-5E-FE-xx-xx-xx-xx
2345 * - value 0
2346 * - XXX: already assigned to an address on the device
2347 */
2348 if (idev->rndid[0] == 0xfd &&
2349 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2350 (idev->rndid[7]&0x80))
2351 goto regen;
2352 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2353 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2354 goto regen;
2355 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2356 goto regen;
2357 }
2358 }
2359
2360 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2361 {
2362 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2363 ipv6_regen_rndid(idev);
2364 }
2365
2366 /*
2367 * Add prefix route.
2368 */
2369
2370 static void
2371 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2372 struct net_device *dev, unsigned long expires,
2373 u32 flags, gfp_t gfp_flags)
2374 {
2375 struct fib6_config cfg = {
2376 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2377 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2378 .fc_ifindex = dev->ifindex,
2379 .fc_expires = expires,
2380 .fc_dst_len = plen,
2381 .fc_flags = RTF_UP | flags,
2382 .fc_nlinfo.nl_net = dev_net(dev),
2383 .fc_protocol = RTPROT_KERNEL,
2384 .fc_type = RTN_UNICAST,
2385 };
2386
2387 cfg.fc_dst = *pfx;
2388
2389 /* Prevent useless cloning on PtP SIT.
2390 This thing is done here expecting that the whole
2391 class of non-broadcast devices need not cloning.
2392 */
2393 #if IS_ENABLED(CONFIG_IPV6_SIT)
2394 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2395 cfg.fc_flags |= RTF_NONEXTHOP;
2396 #endif
2397
2398 ip6_route_add(&cfg, gfp_flags, NULL);
2399 }
2400
2401
2402 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2403 int plen,
2404 const struct net_device *dev,
2405 u32 flags, u32 noflags)
2406 {
2407 struct fib6_node *fn;
2408 struct fib6_info *rt = NULL;
2409 struct fib6_table *table;
2410 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2411
2412 table = fib6_get_table(dev_net(dev), tb_id);
2413 if (!table)
2414 return NULL;
2415
2416 rcu_read_lock();
2417 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2418 if (!fn)
2419 goto out;
2420
2421 for_each_fib6_node_rt_rcu(fn) {
2422 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex)
2423 continue;
2424 if ((rt->fib6_flags & flags) != flags)
2425 continue;
2426 if ((rt->fib6_flags & noflags) != 0)
2427 continue;
2428 if (!fib6_info_hold_safe(rt))
2429 continue;
2430 break;
2431 }
2432 out:
2433 rcu_read_unlock();
2434 return rt;
2435 }
2436
2437
2438 /* Create "default" multicast route to the interface */
2439
2440 static void addrconf_add_mroute(struct net_device *dev)
2441 {
2442 struct fib6_config cfg = {
2443 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2444 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2445 .fc_ifindex = dev->ifindex,
2446 .fc_dst_len = 8,
2447 .fc_flags = RTF_UP,
2448 .fc_type = RTN_UNICAST,
2449 .fc_nlinfo.nl_net = dev_net(dev),
2450 };
2451
2452 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2453
2454 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2455 }
2456
2457 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2458 {
2459 struct inet6_dev *idev;
2460
2461 ASSERT_RTNL();
2462
2463 idev = ipv6_find_idev(dev);
2464 if (!idev)
2465 return ERR_PTR(-ENOBUFS);
2466
2467 if (idev->cnf.disable_ipv6)
2468 return ERR_PTR(-EACCES);
2469
2470 /* Add default multicast route */
2471 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2472 addrconf_add_mroute(dev);
2473
2474 return idev;
2475 }
2476
2477 static void manage_tempaddrs(struct inet6_dev *idev,
2478 struct inet6_ifaddr *ifp,
2479 __u32 valid_lft, __u32 prefered_lft,
2480 bool create, unsigned long now)
2481 {
2482 u32 flags;
2483 struct inet6_ifaddr *ift;
2484
2485 read_lock_bh(&idev->lock);
2486 /* update all temporary addresses in the list */
2487 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2488 int age, max_valid, max_prefered;
2489
2490 if (ifp != ift->ifpub)
2491 continue;
2492
2493 /* RFC 4941 section 3.3:
2494 * If a received option will extend the lifetime of a public
2495 * address, the lifetimes of temporary addresses should
2496 * be extended, subject to the overall constraint that no
2497 * temporary addresses should ever remain "valid" or "preferred"
2498 * for a time longer than (TEMP_VALID_LIFETIME) or
2499 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2500 */
2501 age = (now - ift->cstamp) / HZ;
2502 max_valid = idev->cnf.temp_valid_lft - age;
2503 if (max_valid < 0)
2504 max_valid = 0;
2505
2506 max_prefered = idev->cnf.temp_prefered_lft -
2507 idev->desync_factor - age;
2508 if (max_prefered < 0)
2509 max_prefered = 0;
2510
2511 if (valid_lft > max_valid)
2512 valid_lft = max_valid;
2513
2514 if (prefered_lft > max_prefered)
2515 prefered_lft = max_prefered;
2516
2517 spin_lock(&ift->lock);
2518 flags = ift->flags;
2519 ift->valid_lft = valid_lft;
2520 ift->prefered_lft = prefered_lft;
2521 ift->tstamp = now;
2522 if (prefered_lft > 0)
2523 ift->flags &= ~IFA_F_DEPRECATED;
2524
2525 spin_unlock(&ift->lock);
2526 if (!(flags&IFA_F_TENTATIVE))
2527 ipv6_ifa_notify(0, ift);
2528 }
2529
2530 if ((create || list_empty(&idev->tempaddr_list)) &&
2531 idev->cnf.use_tempaddr > 0) {
2532 /* When a new public address is created as described
2533 * in [ADDRCONF], also create a new temporary address.
2534 * Also create a temporary address if it's enabled but
2535 * no temporary address currently exists.
2536 */
2537 read_unlock_bh(&idev->lock);
2538 ipv6_create_tempaddr(ifp, NULL, false);
2539 } else {
2540 read_unlock_bh(&idev->lock);
2541 }
2542 }
2543
2544 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2545 {
2546 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2547 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2548 }
2549
2550 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2551 const struct prefix_info *pinfo,
2552 struct inet6_dev *in6_dev,
2553 const struct in6_addr *addr, int addr_type,
2554 u32 addr_flags, bool sllao, bool tokenized,
2555 __u32 valid_lft, u32 prefered_lft)
2556 {
2557 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2558 int create = 0, update_lft = 0;
2559
2560 if (!ifp && valid_lft) {
2561 int max_addresses = in6_dev->cnf.max_addresses;
2562 struct ifa6_config cfg = {
2563 .pfx = addr,
2564 .plen = pinfo->prefix_len,
2565 .ifa_flags = addr_flags,
2566 .valid_lft = valid_lft,
2567 .preferred_lft = prefered_lft,
2568 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2569 };
2570
2571 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2572 if ((net->ipv6.devconf_all->optimistic_dad ||
2573 in6_dev->cnf.optimistic_dad) &&
2574 !net->ipv6.devconf_all->forwarding && sllao)
2575 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2576 #endif
2577
2578 /* Do not allow to create too much of autoconfigured
2579 * addresses; this would be too easy way to crash kernel.
2580 */
2581 if (!max_addresses ||
2582 ipv6_count_addresses(in6_dev) < max_addresses)
2583 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2584
2585 if (IS_ERR_OR_NULL(ifp))
2586 return -1;
2587
2588 create = 1;
2589 spin_lock_bh(&ifp->lock);
2590 ifp->flags |= IFA_F_MANAGETEMPADDR;
2591 ifp->cstamp = jiffies;
2592 ifp->tokenized = tokenized;
2593 spin_unlock_bh(&ifp->lock);
2594 addrconf_dad_start(ifp);
2595 }
2596
2597 if (ifp) {
2598 u32 flags;
2599 unsigned long now;
2600 u32 stored_lft;
2601
2602 /* update lifetime (RFC2462 5.5.3 e) */
2603 spin_lock_bh(&ifp->lock);
2604 now = jiffies;
2605 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2606 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2607 else
2608 stored_lft = 0;
2609 if (!create && stored_lft) {
2610 const u32 minimum_lft = min_t(u32,
2611 stored_lft, MIN_VALID_LIFETIME);
2612 valid_lft = max(valid_lft, minimum_lft);
2613
2614 /* RFC4862 Section 5.5.3e:
2615 * "Note that the preferred lifetime of the
2616 * corresponding address is always reset to
2617 * the Preferred Lifetime in the received
2618 * Prefix Information option, regardless of
2619 * whether the valid lifetime is also reset or
2620 * ignored."
2621 *
2622 * So we should always update prefered_lft here.
2623 */
2624 update_lft = 1;
2625 }
2626
2627 if (update_lft) {
2628 ifp->valid_lft = valid_lft;
2629 ifp->prefered_lft = prefered_lft;
2630 ifp->tstamp = now;
2631 flags = ifp->flags;
2632 ifp->flags &= ~IFA_F_DEPRECATED;
2633 spin_unlock_bh(&ifp->lock);
2634
2635 if (!(flags&IFA_F_TENTATIVE))
2636 ipv6_ifa_notify(0, ifp);
2637 } else
2638 spin_unlock_bh(&ifp->lock);
2639
2640 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2641 create, now);
2642
2643 in6_ifa_put(ifp);
2644 addrconf_verify();
2645 }
2646
2647 return 0;
2648 }
2649 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2650
2651 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2652 {
2653 struct prefix_info *pinfo;
2654 __u32 valid_lft;
2655 __u32 prefered_lft;
2656 int addr_type, err;
2657 u32 addr_flags = 0;
2658 struct inet6_dev *in6_dev;
2659 struct net *net = dev_net(dev);
2660
2661 pinfo = (struct prefix_info *) opt;
2662
2663 if (len < sizeof(struct prefix_info)) {
2664 netdev_dbg(dev, "addrconf: prefix option too short\n");
2665 return;
2666 }
2667
2668 /*
2669 * Validation checks ([ADDRCONF], page 19)
2670 */
2671
2672 addr_type = ipv6_addr_type(&pinfo->prefix);
2673
2674 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2675 return;
2676
2677 valid_lft = ntohl(pinfo->valid);
2678 prefered_lft = ntohl(pinfo->prefered);
2679
2680 if (prefered_lft > valid_lft) {
2681 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2682 return;
2683 }
2684
2685 in6_dev = in6_dev_get(dev);
2686
2687 if (!in6_dev) {
2688 net_dbg_ratelimited("addrconf: device %s not configured\n",
2689 dev->name);
2690 return;
2691 }
2692
2693 /*
2694 * Two things going on here:
2695 * 1) Add routes for on-link prefixes
2696 * 2) Configure prefixes with the auto flag set
2697 */
2698
2699 if (pinfo->onlink) {
2700 struct fib6_info *rt;
2701 unsigned long rt_expires;
2702
2703 /* Avoid arithmetic overflow. Really, we could
2704 * save rt_expires in seconds, likely valid_lft,
2705 * but it would require division in fib gc, that it
2706 * not good.
2707 */
2708 if (HZ > USER_HZ)
2709 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2710 else
2711 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2712
2713 if (addrconf_finite_timeout(rt_expires))
2714 rt_expires *= HZ;
2715
2716 rt = addrconf_get_prefix_route(&pinfo->prefix,
2717 pinfo->prefix_len,
2718 dev,
2719 RTF_ADDRCONF | RTF_PREFIX_RT,
2720 RTF_GATEWAY | RTF_DEFAULT);
2721
2722 if (rt) {
2723 /* Autoconf prefix route */
2724 if (valid_lft == 0) {
2725 ip6_del_rt(net, rt);
2726 rt = NULL;
2727 } else if (addrconf_finite_timeout(rt_expires)) {
2728 /* not infinity */
2729 fib6_set_expires(rt, jiffies + rt_expires);
2730 } else {
2731 fib6_clean_expires(rt);
2732 }
2733 } else if (valid_lft) {
2734 clock_t expires = 0;
2735 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2736 if (addrconf_finite_timeout(rt_expires)) {
2737 /* not infinity */
2738 flags |= RTF_EXPIRES;
2739 expires = jiffies_to_clock_t(rt_expires);
2740 }
2741 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2742 0, dev, expires, flags,
2743 GFP_ATOMIC);
2744 }
2745 fib6_info_release(rt);
2746 }
2747
2748 /* Try to figure out our local address for this prefix */
2749
2750 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2751 struct in6_addr addr;
2752 bool tokenized = false, dev_addr_generated = false;
2753
2754 if (pinfo->prefix_len == 64) {
2755 memcpy(&addr, &pinfo->prefix, 8);
2756
2757 if (!ipv6_addr_any(&in6_dev->token)) {
2758 read_lock_bh(&in6_dev->lock);
2759 memcpy(addr.s6_addr + 8,
2760 in6_dev->token.s6_addr + 8, 8);
2761 read_unlock_bh(&in6_dev->lock);
2762 tokenized = true;
2763 } else if (is_addr_mode_generate_stable(in6_dev) &&
2764 !ipv6_generate_stable_address(&addr, 0,
2765 in6_dev)) {
2766 addr_flags |= IFA_F_STABLE_PRIVACY;
2767 goto ok;
2768 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2769 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2770 goto put;
2771 } else {
2772 dev_addr_generated = true;
2773 }
2774 goto ok;
2775 }
2776 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2777 pinfo->prefix_len);
2778 goto put;
2779
2780 ok:
2781 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2782 &addr, addr_type,
2783 addr_flags, sllao,
2784 tokenized, valid_lft,
2785 prefered_lft);
2786 if (err)
2787 goto put;
2788
2789 /* Ignore error case here because previous prefix add addr was
2790 * successful which will be notified.
2791 */
2792 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2793 addr_type, addr_flags, sllao,
2794 tokenized, valid_lft,
2795 prefered_lft,
2796 dev_addr_generated);
2797 }
2798 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2799 put:
2800 in6_dev_put(in6_dev);
2801 }
2802
2803 /*
2804 * Set destination address.
2805 * Special case for SIT interfaces where we create a new "virtual"
2806 * device.
2807 */
2808 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2809 {
2810 struct in6_ifreq ireq;
2811 struct net_device *dev;
2812 int err = -EINVAL;
2813
2814 rtnl_lock();
2815
2816 err = -EFAULT;
2817 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2818 goto err_exit;
2819
2820 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2821
2822 err = -ENODEV;
2823 if (!dev)
2824 goto err_exit;
2825
2826 #if IS_ENABLED(CONFIG_IPV6_SIT)
2827 if (dev->type == ARPHRD_SIT) {
2828 const struct net_device_ops *ops = dev->netdev_ops;
2829 struct ifreq ifr;
2830 struct ip_tunnel_parm p;
2831
2832 err = -EADDRNOTAVAIL;
2833 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2834 goto err_exit;
2835
2836 memset(&p, 0, sizeof(p));
2837 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2838 p.iph.saddr = 0;
2839 p.iph.version = 4;
2840 p.iph.ihl = 5;
2841 p.iph.protocol = IPPROTO_IPV6;
2842 p.iph.ttl = 64;
2843 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2844
2845 if (ops->ndo_do_ioctl) {
2846 mm_segment_t oldfs = get_fs();
2847
2848 set_fs(KERNEL_DS);
2849 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2850 set_fs(oldfs);
2851 } else
2852 err = -EOPNOTSUPP;
2853
2854 if (err == 0) {
2855 err = -ENOBUFS;
2856 dev = __dev_get_by_name(net, p.name);
2857 if (!dev)
2858 goto err_exit;
2859 err = dev_open(dev, NULL);
2860 }
2861 }
2862 #endif
2863
2864 err_exit:
2865 rtnl_unlock();
2866 return err;
2867 }
2868
2869 static int ipv6_mc_config(struct sock *sk, bool join,
2870 const struct in6_addr *addr, int ifindex)
2871 {
2872 int ret;
2873
2874 ASSERT_RTNL();
2875
2876 lock_sock(sk);
2877 if (join)
2878 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2879 else
2880 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2881 release_sock(sk);
2882
2883 return ret;
2884 }
2885
2886 /*
2887 * Manual configuration of address on an interface
2888 */
2889 static int inet6_addr_add(struct net *net, int ifindex,
2890 struct ifa6_config *cfg,
2891 struct netlink_ext_ack *extack)
2892 {
2893 struct inet6_ifaddr *ifp;
2894 struct inet6_dev *idev;
2895 struct net_device *dev;
2896 unsigned long timeout;
2897 clock_t expires;
2898 u32 flags;
2899
2900 ASSERT_RTNL();
2901
2902 if (cfg->plen > 128)
2903 return -EINVAL;
2904
2905 /* check the lifetime */
2906 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2907 return -EINVAL;
2908
2909 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2910 return -EINVAL;
2911
2912 dev = __dev_get_by_index(net, ifindex);
2913 if (!dev)
2914 return -ENODEV;
2915
2916 idev = addrconf_add_dev(dev);
2917 if (IS_ERR(idev))
2918 return PTR_ERR(idev);
2919
2920 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2921 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2922 true, cfg->pfx, ifindex);
2923
2924 if (ret < 0)
2925 return ret;
2926 }
2927
2928 cfg->scope = ipv6_addr_scope(cfg->pfx);
2929
2930 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2931 if (addrconf_finite_timeout(timeout)) {
2932 expires = jiffies_to_clock_t(timeout * HZ);
2933 cfg->valid_lft = timeout;
2934 flags = RTF_EXPIRES;
2935 } else {
2936 expires = 0;
2937 flags = 0;
2938 cfg->ifa_flags |= IFA_F_PERMANENT;
2939 }
2940
2941 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2942 if (addrconf_finite_timeout(timeout)) {
2943 if (timeout == 0)
2944 cfg->ifa_flags |= IFA_F_DEPRECATED;
2945 cfg->preferred_lft = timeout;
2946 }
2947
2948 ifp = ipv6_add_addr(idev, cfg, true, extack);
2949 if (!IS_ERR(ifp)) {
2950 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2951 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2952 ifp->rt_priority, dev, expires,
2953 flags, GFP_KERNEL);
2954 }
2955
2956 /* Send a netlink notification if DAD is enabled and
2957 * optimistic flag is not set
2958 */
2959 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2960 ipv6_ifa_notify(0, ifp);
2961 /*
2962 * Note that section 3.1 of RFC 4429 indicates
2963 * that the Optimistic flag should not be set for
2964 * manually configured addresses
2965 */
2966 addrconf_dad_start(ifp);
2967 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2968 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2969 cfg->preferred_lft, true, jiffies);
2970 in6_ifa_put(ifp);
2971 addrconf_verify_rtnl();
2972 return 0;
2973 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2974 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2975 cfg->pfx, ifindex);
2976 }
2977
2978 return PTR_ERR(ifp);
2979 }
2980
2981 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2982 const struct in6_addr *pfx, unsigned int plen)
2983 {
2984 struct inet6_ifaddr *ifp;
2985 struct inet6_dev *idev;
2986 struct net_device *dev;
2987
2988 if (plen > 128)
2989 return -EINVAL;
2990
2991 dev = __dev_get_by_index(net, ifindex);
2992 if (!dev)
2993 return -ENODEV;
2994
2995 idev = __in6_dev_get(dev);
2996 if (!idev)
2997 return -ENXIO;
2998
2999 read_lock_bh(&idev->lock);
3000 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3001 if (ifp->prefix_len == plen &&
3002 ipv6_addr_equal(pfx, &ifp->addr)) {
3003 in6_ifa_hold(ifp);
3004 read_unlock_bh(&idev->lock);
3005
3006 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3007 (ifa_flags & IFA_F_MANAGETEMPADDR))
3008 manage_tempaddrs(idev, ifp, 0, 0, false,
3009 jiffies);
3010 ipv6_del_addr(ifp);
3011 addrconf_verify_rtnl();
3012 if (ipv6_addr_is_multicast(pfx)) {
3013 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3014 false, pfx, dev->ifindex);
3015 }
3016 return 0;
3017 }
3018 }
3019 read_unlock_bh(&idev->lock);
3020 return -EADDRNOTAVAIL;
3021 }
3022
3023
3024 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3025 {
3026 struct ifa6_config cfg = {
3027 .ifa_flags = IFA_F_PERMANENT,
3028 .preferred_lft = INFINITY_LIFE_TIME,
3029 .valid_lft = INFINITY_LIFE_TIME,
3030 };
3031 struct in6_ifreq ireq;
3032 int err;
3033
3034 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3035 return -EPERM;
3036
3037 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3038 return -EFAULT;
3039
3040 cfg.pfx = &ireq.ifr6_addr;
3041 cfg.plen = ireq.ifr6_prefixlen;
3042
3043 rtnl_lock();
3044 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3045 rtnl_unlock();
3046 return err;
3047 }
3048
3049 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3050 {
3051 struct in6_ifreq ireq;
3052 int err;
3053
3054 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3055 return -EPERM;
3056
3057 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3058 return -EFAULT;
3059
3060 rtnl_lock();
3061 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3062 ireq.ifr6_prefixlen);
3063 rtnl_unlock();
3064 return err;
3065 }
3066
3067 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3068 int plen, int scope)
3069 {
3070 struct inet6_ifaddr *ifp;
3071 struct ifa6_config cfg = {
3072 .pfx = addr,
3073 .plen = plen,
3074 .ifa_flags = IFA_F_PERMANENT,
3075 .valid_lft = INFINITY_LIFE_TIME,
3076 .preferred_lft = INFINITY_LIFE_TIME,
3077 .scope = scope
3078 };
3079
3080 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3081 if (!IS_ERR(ifp)) {
3082 spin_lock_bh(&ifp->lock);
3083 ifp->flags &= ~IFA_F_TENTATIVE;
3084 spin_unlock_bh(&ifp->lock);
3085 rt_genid_bump_ipv6(dev_net(idev->dev));
3086 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3087 in6_ifa_put(ifp);
3088 }
3089 }
3090
3091 #if IS_ENABLED(CONFIG_IPV6_SIT)
3092 static void sit_add_v4_addrs(struct inet6_dev *idev)
3093 {
3094 struct in6_addr addr;
3095 struct net_device *dev;
3096 struct net *net = dev_net(idev->dev);
3097 int scope, plen;
3098 u32 pflags = 0;
3099
3100 ASSERT_RTNL();
3101
3102 memset(&addr, 0, sizeof(struct in6_addr));
3103 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3104
3105 if (idev->dev->flags&IFF_POINTOPOINT) {
3106 addr.s6_addr32[0] = htonl(0xfe800000);
3107 scope = IFA_LINK;
3108 plen = 64;
3109 } else {
3110 scope = IPV6_ADDR_COMPATv4;
3111 plen = 96;
3112 pflags |= RTF_NONEXTHOP;
3113 }
3114
3115 if (addr.s6_addr32[3]) {
3116 add_addr(idev, &addr, plen, scope);
3117 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3118 GFP_KERNEL);
3119 return;
3120 }
3121
3122 for_each_netdev(net, dev) {
3123 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3124 if (in_dev && (dev->flags & IFF_UP)) {
3125 struct in_ifaddr *ifa;
3126
3127 int flag = scope;
3128
3129 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
3130
3131 addr.s6_addr32[3] = ifa->ifa_local;
3132
3133 if (ifa->ifa_scope == RT_SCOPE_LINK)
3134 continue;
3135 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3136 if (idev->dev->flags&IFF_POINTOPOINT)
3137 continue;
3138 flag |= IFA_HOST;
3139 }
3140
3141 add_addr(idev, &addr, plen, flag);
3142 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3143 0, pflags, GFP_KERNEL);
3144 }
3145 }
3146 }
3147 }
3148 #endif
3149
3150 static void init_loopback(struct net_device *dev)
3151 {
3152 struct inet6_dev *idev;
3153
3154 /* ::1 */
3155
3156 ASSERT_RTNL();
3157
3158 idev = ipv6_find_idev(dev);
3159 if (!idev) {
3160 pr_debug("%s: add_dev failed\n", __func__);
3161 return;
3162 }
3163
3164 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3165 }
3166
3167 void addrconf_add_linklocal(struct inet6_dev *idev,
3168 const struct in6_addr *addr, u32 flags)
3169 {
3170 struct ifa6_config cfg = {
3171 .pfx = addr,
3172 .plen = 64,
3173 .ifa_flags = flags | IFA_F_PERMANENT,
3174 .valid_lft = INFINITY_LIFE_TIME,
3175 .preferred_lft = INFINITY_LIFE_TIME,
3176 .scope = IFA_LINK
3177 };
3178 struct inet6_ifaddr *ifp;
3179
3180 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3181 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3182 idev->cnf.optimistic_dad) &&
3183 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3184 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3185 #endif
3186
3187 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3188 if (!IS_ERR(ifp)) {
3189 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3190 0, 0, GFP_ATOMIC);
3191 addrconf_dad_start(ifp);
3192 in6_ifa_put(ifp);
3193 }
3194 }
3195 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3196
3197 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3198 {
3199 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3200 return true;
3201
3202 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3203 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3204 return true;
3205
3206 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3207 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3208 return true;
3209
3210 return false;
3211 }
3212
3213 static int ipv6_generate_stable_address(struct in6_addr *address,
3214 u8 dad_count,
3215 const struct inet6_dev *idev)
3216 {
3217 static DEFINE_SPINLOCK(lock);
3218 static __u32 digest[SHA_DIGEST_WORDS];
3219 static __u32 workspace[SHA_WORKSPACE_WORDS];
3220
3221 static union {
3222 char __data[SHA_MESSAGE_BYTES];
3223 struct {
3224 struct in6_addr secret;
3225 __be32 prefix[2];
3226 unsigned char hwaddr[MAX_ADDR_LEN];
3227 u8 dad_count;
3228 } __packed;
3229 } data;
3230
3231 struct in6_addr secret;
3232 struct in6_addr temp;
3233 struct net *net = dev_net(idev->dev);
3234
3235 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3236
3237 if (idev->cnf.stable_secret.initialized)
3238 secret = idev->cnf.stable_secret.secret;
3239 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3240 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3241 else
3242 return -1;
3243
3244 retry:
3245 spin_lock_bh(&lock);
3246
3247 sha_init(digest);
3248 memset(&data, 0, sizeof(data));
3249 memset(workspace, 0, sizeof(workspace));
3250 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3251 data.prefix[0] = address->s6_addr32[0];
3252 data.prefix[1] = address->s6_addr32[1];
3253 data.secret = secret;
3254 data.dad_count = dad_count;
3255
3256 sha_transform(digest, data.__data, workspace);
3257
3258 temp = *address;
3259 temp.s6_addr32[2] = (__force __be32)digest[0];
3260 temp.s6_addr32[3] = (__force __be32)digest[1];
3261
3262 spin_unlock_bh(&lock);
3263
3264 if (ipv6_reserved_interfaceid(temp)) {
3265 dad_count++;
3266 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3267 return -1;
3268 goto retry;
3269 }
3270
3271 *address = temp;
3272 return 0;
3273 }
3274
3275 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3276 {
3277 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3278
3279 if (s->initialized)
3280 return;
3281 s = &idev->cnf.stable_secret;
3282 get_random_bytes(&s->secret, sizeof(s->secret));
3283 s->initialized = true;
3284 }
3285
3286 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3287 {
3288 struct in6_addr addr;
3289
3290 /* no link local addresses on L3 master devices */
3291 if (netif_is_l3_master(idev->dev))
3292 return;
3293
3294 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3295
3296 switch (idev->cnf.addr_gen_mode) {
3297 case IN6_ADDR_GEN_MODE_RANDOM:
3298 ipv6_gen_mode_random_init(idev);
3299 /* fallthrough */
3300 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3301 if (!ipv6_generate_stable_address(&addr, 0, idev))
3302 addrconf_add_linklocal(idev, &addr,
3303 IFA_F_STABLE_PRIVACY);
3304 else if (prefix_route)
3305 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3306 0, 0, GFP_KERNEL);
3307 break;
3308 case IN6_ADDR_GEN_MODE_EUI64:
3309 /* addrconf_add_linklocal also adds a prefix_route and we
3310 * only need to care about prefix routes if ipv6_generate_eui64
3311 * couldn't generate one.
3312 */
3313 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3314 addrconf_add_linklocal(idev, &addr, 0);
3315 else if (prefix_route)
3316 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3317 0, 0, GFP_KERNEL);
3318 break;
3319 case IN6_ADDR_GEN_MODE_NONE:
3320 default:
3321 /* will not add any link local address */
3322 break;
3323 }
3324 }
3325
3326 static void addrconf_dev_config(struct net_device *dev)
3327 {
3328 struct inet6_dev *idev;
3329
3330 ASSERT_RTNL();
3331
3332 if ((dev->type != ARPHRD_ETHER) &&
3333 (dev->type != ARPHRD_FDDI) &&
3334 (dev->type != ARPHRD_ARCNET) &&
3335 (dev->type != ARPHRD_INFINIBAND) &&
3336 (dev->type != ARPHRD_IEEE1394) &&
3337 (dev->type != ARPHRD_TUNNEL6) &&
3338 (dev->type != ARPHRD_6LOWPAN) &&
3339 (dev->type != ARPHRD_IP6GRE) &&
3340 (dev->type != ARPHRD_IPGRE) &&
3341 (dev->type != ARPHRD_TUNNEL) &&
3342 (dev->type != ARPHRD_NONE) &&
3343 (dev->type != ARPHRD_RAWIP)) {
3344 /* Alas, we support only Ethernet autoconfiguration. */
3345 return;
3346 }
3347
3348 idev = addrconf_add_dev(dev);
3349 if (IS_ERR(idev))
3350 return;
3351
3352 /* this device type has no EUI support */
3353 if (dev->type == ARPHRD_NONE &&
3354 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3355 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3356
3357 addrconf_addr_gen(idev, false);
3358 }
3359
3360 #if IS_ENABLED(CONFIG_IPV6_SIT)
3361 static void addrconf_sit_config(struct net_device *dev)
3362 {
3363 struct inet6_dev *idev;
3364
3365 ASSERT_RTNL();
3366
3367 /*
3368 * Configure the tunnel with one of our IPv4
3369 * addresses... we should configure all of
3370 * our v4 addrs in the tunnel
3371 */
3372
3373 idev = ipv6_find_idev(dev);
3374 if (!idev) {
3375 pr_debug("%s: add_dev failed\n", __func__);
3376 return;
3377 }
3378
3379 if (dev->priv_flags & IFF_ISATAP) {
3380 addrconf_addr_gen(idev, false);
3381 return;
3382 }
3383
3384 sit_add_v4_addrs(idev);
3385
3386 if (dev->flags&IFF_POINTOPOINT)
3387 addrconf_add_mroute(dev);
3388 }
3389 #endif
3390
3391 #if IS_ENABLED(CONFIG_NET_IPGRE)
3392 static void addrconf_gre_config(struct net_device *dev)
3393 {
3394 struct inet6_dev *idev;
3395
3396 ASSERT_RTNL();
3397
3398 idev = ipv6_find_idev(dev);
3399 if (!idev) {
3400 pr_debug("%s: add_dev failed\n", __func__);
3401 return;
3402 }
3403
3404 addrconf_addr_gen(idev, true);
3405 if (dev->flags & IFF_POINTOPOINT)
3406 addrconf_add_mroute(dev);
3407 }
3408 #endif
3409
3410 static int fixup_permanent_addr(struct net *net,
3411 struct inet6_dev *idev,
3412 struct inet6_ifaddr *ifp)
3413 {
3414 /* !fib6_node means the host route was removed from the
3415 * FIB, for example, if 'lo' device is taken down. In that
3416 * case regenerate the host route.
3417 */
3418 if (!ifp->rt || !ifp->rt->fib6_node) {
3419 struct fib6_info *f6i, *prev;
3420
3421 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3422 GFP_ATOMIC);
3423 if (IS_ERR(f6i))
3424 return PTR_ERR(f6i);
3425
3426 /* ifp->rt can be accessed outside of rtnl */
3427 spin_lock(&ifp->lock);
3428 prev = ifp->rt;
3429 ifp->rt = f6i;
3430 spin_unlock(&ifp->lock);
3431
3432 fib6_info_release(prev);
3433 }
3434
3435 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3436 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3437 ifp->rt_priority, idev->dev, 0, 0,
3438 GFP_ATOMIC);
3439 }
3440
3441 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3442 addrconf_dad_start(ifp);
3443
3444 return 0;
3445 }
3446
3447 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3448 {
3449 struct inet6_ifaddr *ifp, *tmp;
3450 struct inet6_dev *idev;
3451
3452 idev = __in6_dev_get(dev);
3453 if (!idev)
3454 return;
3455
3456 write_lock_bh(&idev->lock);
3457
3458 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3459 if ((ifp->flags & IFA_F_PERMANENT) &&
3460 fixup_permanent_addr(net, idev, ifp) < 0) {
3461 write_unlock_bh(&idev->lock);
3462 in6_ifa_hold(ifp);
3463 ipv6_del_addr(ifp);
3464 write_lock_bh(&idev->lock);
3465
3466 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3467 idev->dev->name, &ifp->addr);
3468 }
3469 }
3470
3471 write_unlock_bh(&idev->lock);
3472 }
3473
3474 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3475 void *ptr)
3476 {
3477 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3478 struct netdev_notifier_change_info *change_info;
3479 struct netdev_notifier_changeupper_info *info;
3480 struct inet6_dev *idev = __in6_dev_get(dev);
3481 struct net *net = dev_net(dev);
3482 int run_pending = 0;
3483 int err;
3484
3485 switch (event) {
3486 case NETDEV_REGISTER:
3487 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3488 idev = ipv6_add_dev(dev);
3489 if (IS_ERR(idev))
3490 return notifier_from_errno(PTR_ERR(idev));
3491 }
3492 break;
3493
3494 case NETDEV_CHANGEMTU:
3495 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3496 if (dev->mtu < IPV6_MIN_MTU) {
3497 addrconf_ifdown(dev, dev != net->loopback_dev);
3498 break;
3499 }
3500
3501 if (idev) {
3502 rt6_mtu_change(dev, dev->mtu);
3503 idev->cnf.mtu6 = dev->mtu;
3504 break;
3505 }
3506
3507 /* allocate new idev */
3508 idev = ipv6_add_dev(dev);
3509 if (IS_ERR(idev))
3510 break;
3511
3512 /* device is still not ready */
3513 if (!(idev->if_flags & IF_READY))
3514 break;
3515
3516 run_pending = 1;
3517
3518 /* fall through */
3519
3520 case NETDEV_UP:
3521 case NETDEV_CHANGE:
3522 if (dev->flags & IFF_SLAVE)
3523 break;
3524
3525 if (idev && idev->cnf.disable_ipv6)
3526 break;
3527
3528 if (event == NETDEV_UP) {
3529 /* restore routes for permanent addresses */
3530 addrconf_permanent_addr(net, dev);
3531
3532 if (!addrconf_link_ready(dev)) {
3533 /* device is not ready yet. */
3534 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3535 dev->name);
3536 break;
3537 }
3538
3539 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3540 idev = ipv6_add_dev(dev);
3541
3542 if (!IS_ERR_OR_NULL(idev)) {
3543 idev->if_flags |= IF_READY;
3544 run_pending = 1;
3545 }
3546 } else if (event == NETDEV_CHANGE) {
3547 if (!addrconf_link_ready(dev)) {
3548 /* device is still not ready. */
3549 rt6_sync_down_dev(dev, event);
3550 break;
3551 }
3552
3553 if (!IS_ERR_OR_NULL(idev)) {
3554 if (idev->if_flags & IF_READY) {
3555 /* device is already configured -
3556 * but resend MLD reports, we might
3557 * have roamed and need to update
3558 * multicast snooping switches
3559 */
3560 ipv6_mc_up(idev);
3561 change_info = ptr;
3562 if (change_info->flags_changed & IFF_NOARP)
3563 addrconf_dad_run(idev, true);
3564 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3565 break;
3566 }
3567 idev->if_flags |= IF_READY;
3568 }
3569
3570 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3571 dev->name);
3572
3573 run_pending = 1;
3574 }
3575
3576 switch (dev->type) {
3577 #if IS_ENABLED(CONFIG_IPV6_SIT)
3578 case ARPHRD_SIT:
3579 addrconf_sit_config(dev);
3580 break;
3581 #endif
3582 #if IS_ENABLED(CONFIG_NET_IPGRE)
3583 case ARPHRD_IPGRE:
3584 addrconf_gre_config(dev);
3585 break;
3586 #endif
3587 case ARPHRD_LOOPBACK:
3588 init_loopback(dev);
3589 break;
3590
3591 default:
3592 addrconf_dev_config(dev);
3593 break;
3594 }
3595
3596 if (!IS_ERR_OR_NULL(idev)) {
3597 if (run_pending)
3598 addrconf_dad_run(idev, false);
3599
3600 /* Device has an address by now */
3601 rt6_sync_up(dev, RTNH_F_DEAD);
3602
3603 /*
3604 * If the MTU changed during the interface down,
3605 * when the interface up, the changed MTU must be
3606 * reflected in the idev as well as routers.
3607 */
3608 if (idev->cnf.mtu6 != dev->mtu &&
3609 dev->mtu >= IPV6_MIN_MTU) {
3610 rt6_mtu_change(dev, dev->mtu);
3611 idev->cnf.mtu6 = dev->mtu;
3612 }
3613 idev->tstamp = jiffies;
3614 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3615
3616 /*
3617 * If the changed mtu during down is lower than
3618 * IPV6_MIN_MTU stop IPv6 on this interface.
3619 */
3620 if (dev->mtu < IPV6_MIN_MTU)
3621 addrconf_ifdown(dev, dev != net->loopback_dev);
3622 }
3623 break;
3624
3625 case NETDEV_DOWN:
3626 case NETDEV_UNREGISTER:
3627 /*
3628 * Remove all addresses from this interface.
3629 */
3630 addrconf_ifdown(dev, event != NETDEV_DOWN);
3631 break;
3632
3633 case NETDEV_CHANGENAME:
3634 if (idev) {
3635 snmp6_unregister_dev(idev);
3636 addrconf_sysctl_unregister(idev);
3637 err = addrconf_sysctl_register(idev);
3638 if (err)
3639 return notifier_from_errno(err);
3640 err = snmp6_register_dev(idev);
3641 if (err) {
3642 addrconf_sysctl_unregister(idev);
3643 return notifier_from_errno(err);
3644 }
3645 }
3646 break;
3647
3648 case NETDEV_PRE_TYPE_CHANGE:
3649 case NETDEV_POST_TYPE_CHANGE:
3650 if (idev)
3651 addrconf_type_change(dev, event);
3652 break;
3653
3654 case NETDEV_CHANGEUPPER:
3655 info = ptr;
3656
3657 /* flush all routes if dev is linked to or unlinked from
3658 * an L3 master device (e.g., VRF)
3659 */
3660 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3661 addrconf_ifdown(dev, 0);
3662 }
3663
3664 return NOTIFY_OK;
3665 }
3666
3667 /*
3668 * addrconf module should be notified of a device going up
3669 */
3670 static struct notifier_block ipv6_dev_notf = {
3671 .notifier_call = addrconf_notify,
3672 .priority = ADDRCONF_NOTIFY_PRIORITY,
3673 };
3674
3675 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3676 {
3677 struct inet6_dev *idev;
3678 ASSERT_RTNL();
3679
3680 idev = __in6_dev_get(dev);
3681
3682 if (event == NETDEV_POST_TYPE_CHANGE)
3683 ipv6_mc_remap(idev);
3684 else if (event == NETDEV_PRE_TYPE_CHANGE)
3685 ipv6_mc_unmap(idev);
3686 }
3687
3688 static bool addr_is_local(const struct in6_addr *addr)
3689 {
3690 return ipv6_addr_type(addr) &
3691 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3692 }
3693
3694 static int addrconf_ifdown(struct net_device *dev, int how)
3695 {
3696 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3697 struct net *net = dev_net(dev);
3698 struct inet6_dev *idev;
3699 struct inet6_ifaddr *ifa, *tmp;
3700 bool keep_addr = false;
3701 int state, i;
3702
3703 ASSERT_RTNL();
3704
3705 rt6_disable_ip(dev, event);
3706
3707 idev = __in6_dev_get(dev);
3708 if (!idev)
3709 return -ENODEV;
3710
3711 /*
3712 * Step 1: remove reference to ipv6 device from parent device.
3713 * Do not dev_put!
3714 */
3715 if (how) {
3716 idev->dead = 1;
3717
3718 /* protected by rtnl_lock */
3719 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3720
3721 /* Step 1.5: remove snmp6 entry */
3722 snmp6_unregister_dev(idev);
3723
3724 }
3725
3726 /* combine the user config with event to determine if permanent
3727 * addresses are to be removed from address hash table
3728 */
3729 if (!how && !idev->cnf.disable_ipv6) {
3730 /* aggregate the system setting and interface setting */
3731 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3732
3733 if (!_keep_addr)
3734 _keep_addr = idev->cnf.keep_addr_on_down;
3735
3736 keep_addr = (_keep_addr > 0);
3737 }
3738
3739 /* Step 2: clear hash table */
3740 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3741 struct hlist_head *h = &inet6_addr_lst[i];
3742
3743 spin_lock_bh(&addrconf_hash_lock);
3744 restart:
3745 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3746 if (ifa->idev == idev) {
3747 addrconf_del_dad_work(ifa);
3748 /* combined flag + permanent flag decide if
3749 * address is retained on a down event
3750 */
3751 if (!keep_addr ||
3752 !(ifa->flags & IFA_F_PERMANENT) ||
3753 addr_is_local(&ifa->addr)) {
3754 hlist_del_init_rcu(&ifa->addr_lst);
3755 goto restart;
3756 }
3757 }
3758 }
3759 spin_unlock_bh(&addrconf_hash_lock);
3760 }
3761
3762 write_lock_bh(&idev->lock);
3763
3764 addrconf_del_rs_timer(idev);
3765
3766 /* Step 2: clear flags for stateless addrconf */
3767 if (!how)
3768 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3769
3770 /* Step 3: clear tempaddr list */
3771 while (!list_empty(&idev->tempaddr_list)) {
3772 ifa = list_first_entry(&idev->tempaddr_list,
3773 struct inet6_ifaddr, tmp_list);
3774 list_del(&ifa->tmp_list);
3775 write_unlock_bh(&idev->lock);
3776 spin_lock_bh(&ifa->lock);
3777
3778 if (ifa->ifpub) {
3779 in6_ifa_put(ifa->ifpub);
3780 ifa->ifpub = NULL;
3781 }
3782 spin_unlock_bh(&ifa->lock);
3783 in6_ifa_put(ifa);
3784 write_lock_bh(&idev->lock);
3785 }
3786
3787 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3788 struct fib6_info *rt = NULL;
3789 bool keep;
3790
3791 addrconf_del_dad_work(ifa);
3792
3793 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3794 !addr_is_local(&ifa->addr);
3795
3796 write_unlock_bh(&idev->lock);
3797 spin_lock_bh(&ifa->lock);
3798
3799 if (keep) {
3800 /* set state to skip the notifier below */
3801 state = INET6_IFADDR_STATE_DEAD;
3802 ifa->state = INET6_IFADDR_STATE_PREDAD;
3803 if (!(ifa->flags & IFA_F_NODAD))
3804 ifa->flags |= IFA_F_TENTATIVE;
3805
3806 rt = ifa->rt;
3807 ifa->rt = NULL;
3808 } else {
3809 state = ifa->state;
3810 ifa->state = INET6_IFADDR_STATE_DEAD;
3811 }
3812
3813 spin_unlock_bh(&ifa->lock);
3814
3815 if (rt)
3816 ip6_del_rt(net, rt);
3817
3818 if (state != INET6_IFADDR_STATE_DEAD) {
3819 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3820 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3821 } else {
3822 if (idev->cnf.forwarding)
3823 addrconf_leave_anycast(ifa);
3824 addrconf_leave_solict(ifa->idev, &ifa->addr);
3825 }
3826
3827 write_lock_bh(&idev->lock);
3828 if (!keep) {
3829 list_del_rcu(&ifa->if_list);
3830 in6_ifa_put(ifa);
3831 }
3832 }
3833
3834 write_unlock_bh(&idev->lock);
3835
3836 /* Step 5: Discard anycast and multicast list */
3837 if (how) {
3838 ipv6_ac_destroy_dev(idev);
3839 ipv6_mc_destroy_dev(idev);
3840 } else {
3841 ipv6_mc_down(idev);
3842 }
3843
3844 idev->tstamp = jiffies;
3845
3846 /* Last: Shot the device (if unregistered) */
3847 if (how) {
3848 addrconf_sysctl_unregister(idev);
3849 neigh_parms_release(&nd_tbl, idev->nd_parms);
3850 neigh_ifdown(&nd_tbl, dev);
3851 in6_dev_put(idev);
3852 }
3853 return 0;
3854 }
3855
3856 static void addrconf_rs_timer(struct timer_list *t)
3857 {
3858 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3859 struct net_device *dev = idev->dev;
3860 struct in6_addr lladdr;
3861
3862 write_lock(&idev->lock);
3863 if (idev->dead || !(idev->if_flags & IF_READY))
3864 goto out;
3865
3866 if (!ipv6_accept_ra(idev))
3867 goto out;
3868
3869 /* Announcement received after solicitation was sent */
3870 if (idev->if_flags & IF_RA_RCVD)
3871 goto out;
3872
3873 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3874 write_unlock(&idev->lock);
3875 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3876 ndisc_send_rs(dev, &lladdr,
3877 &in6addr_linklocal_allrouters);
3878 else
3879 goto put;
3880
3881 write_lock(&idev->lock);
3882 idev->rs_interval = rfc3315_s14_backoff_update(
3883 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3884 /* The wait after the last probe can be shorter */
3885 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3886 idev->cnf.rtr_solicits) ?
3887 idev->cnf.rtr_solicit_delay :
3888 idev->rs_interval);
3889 } else {
3890 /*
3891 * Note: we do not support deprecated "all on-link"
3892 * assumption any longer.
3893 */
3894 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3895 }
3896
3897 out:
3898 write_unlock(&idev->lock);
3899 put:
3900 in6_dev_put(idev);
3901 }
3902
3903 /*
3904 * Duplicate Address Detection
3905 */
3906 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3907 {
3908 unsigned long rand_num;
3909 struct inet6_dev *idev = ifp->idev;
3910 u64 nonce;
3911
3912 if (ifp->flags & IFA_F_OPTIMISTIC)
3913 rand_num = 0;
3914 else
3915 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3916
3917 nonce = 0;
3918 if (idev->cnf.enhanced_dad ||
3919 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3920 do
3921 get_random_bytes(&nonce, 6);
3922 while (nonce == 0);
3923 }
3924 ifp->dad_nonce = nonce;
3925 ifp->dad_probes = idev->cnf.dad_transmits;
3926 addrconf_mod_dad_work(ifp, rand_num);
3927 }
3928
3929 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3930 {
3931 struct inet6_dev *idev = ifp->idev;
3932 struct net_device *dev = idev->dev;
3933 bool bump_id, notify = false;
3934 struct net *net;
3935
3936 addrconf_join_solict(dev, &ifp->addr);
3937
3938 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3939
3940 read_lock_bh(&idev->lock);
3941 spin_lock(&ifp->lock);
3942 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3943 goto out;
3944
3945 net = dev_net(dev);
3946 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3947 (net->ipv6.devconf_all->accept_dad < 1 &&
3948 idev->cnf.accept_dad < 1) ||
3949 !(ifp->flags&IFA_F_TENTATIVE) ||
3950 ifp->flags & IFA_F_NODAD) {
3951 bool send_na = false;
3952
3953 if (ifp->flags & IFA_F_TENTATIVE &&
3954 !(ifp->flags & IFA_F_OPTIMISTIC))
3955 send_na = true;
3956 bump_id = ifp->flags & IFA_F_TENTATIVE;
3957 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3958 spin_unlock(&ifp->lock);
3959 read_unlock_bh(&idev->lock);
3960
3961 addrconf_dad_completed(ifp, bump_id, send_na);
3962 return;
3963 }
3964
3965 if (!(idev->if_flags & IF_READY)) {
3966 spin_unlock(&ifp->lock);
3967 read_unlock_bh(&idev->lock);
3968 /*
3969 * If the device is not ready:
3970 * - keep it tentative if it is a permanent address.
3971 * - otherwise, kill it.
3972 */
3973 in6_ifa_hold(ifp);
3974 addrconf_dad_stop(ifp, 0);
3975 return;
3976 }
3977
3978 /*
3979 * Optimistic nodes can start receiving
3980 * Frames right away
3981 */
3982 if (ifp->flags & IFA_F_OPTIMISTIC) {
3983 ip6_ins_rt(net, ifp->rt);
3984 if (ipv6_use_optimistic_addr(net, idev)) {
3985 /* Because optimistic nodes can use this address,
3986 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3987 */
3988 notify = true;
3989 }
3990 }
3991
3992 addrconf_dad_kick(ifp);
3993 out:
3994 spin_unlock(&ifp->lock);
3995 read_unlock_bh(&idev->lock);
3996 if (notify)
3997 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3998 }
3999
4000 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4001 {
4002 bool begin_dad = false;
4003
4004 spin_lock_bh(&ifp->lock);
4005 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4006 ifp->state = INET6_IFADDR_STATE_PREDAD;
4007 begin_dad = true;
4008 }
4009 spin_unlock_bh(&ifp->lock);
4010
4011 if (begin_dad)
4012 addrconf_mod_dad_work(ifp, 0);
4013 }
4014
4015 static void addrconf_dad_work(struct work_struct *w)
4016 {
4017 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4018 struct inet6_ifaddr,
4019 dad_work);
4020 struct inet6_dev *idev = ifp->idev;
4021 bool bump_id, disable_ipv6 = false;
4022 struct in6_addr mcaddr;
4023
4024 enum {
4025 DAD_PROCESS,
4026 DAD_BEGIN,
4027 DAD_ABORT,
4028 } action = DAD_PROCESS;
4029
4030 rtnl_lock();
4031
4032 spin_lock_bh(&ifp->lock);
4033 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4034 action = DAD_BEGIN;
4035 ifp->state = INET6_IFADDR_STATE_DAD;
4036 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4037 action = DAD_ABORT;
4038 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4039
4040 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4041 idev->cnf.accept_dad > 1) &&
4042 !idev->cnf.disable_ipv6 &&
4043 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4044 struct in6_addr addr;
4045
4046 addr.s6_addr32[0] = htonl(0xfe800000);
4047 addr.s6_addr32[1] = 0;
4048
4049 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4050 ipv6_addr_equal(&ifp->addr, &addr)) {
4051 /* DAD failed for link-local based on MAC */
4052 idev->cnf.disable_ipv6 = 1;
4053
4054 pr_info("%s: IPv6 being disabled!\n",
4055 ifp->idev->dev->name);
4056 disable_ipv6 = true;
4057 }
4058 }
4059 }
4060 spin_unlock_bh(&ifp->lock);
4061
4062 if (action == DAD_BEGIN) {
4063 addrconf_dad_begin(ifp);
4064 goto out;
4065 } else if (action == DAD_ABORT) {
4066 in6_ifa_hold(ifp);
4067 addrconf_dad_stop(ifp, 1);
4068 if (disable_ipv6)
4069 addrconf_ifdown(idev->dev, 0);
4070 goto out;
4071 }
4072
4073 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4074 goto out;
4075
4076 write_lock_bh(&idev->lock);
4077 if (idev->dead || !(idev->if_flags & IF_READY)) {
4078 write_unlock_bh(&idev->lock);
4079 goto out;
4080 }
4081
4082 spin_lock(&ifp->lock);
4083 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4084 spin_unlock(&ifp->lock);
4085 write_unlock_bh(&idev->lock);
4086 goto out;
4087 }
4088
4089 if (ifp->dad_probes == 0) {
4090 bool send_na = false;
4091
4092 /*
4093 * DAD was successful
4094 */
4095
4096 if (ifp->flags & IFA_F_TENTATIVE &&
4097 !(ifp->flags & IFA_F_OPTIMISTIC))
4098 send_na = true;
4099 bump_id = ifp->flags & IFA_F_TENTATIVE;
4100 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4101 spin_unlock(&ifp->lock);
4102 write_unlock_bh(&idev->lock);
4103
4104 addrconf_dad_completed(ifp, bump_id, send_na);
4105
4106 goto out;
4107 }
4108
4109 ifp->dad_probes--;
4110 addrconf_mod_dad_work(ifp,
4111 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4112 spin_unlock(&ifp->lock);
4113 write_unlock_bh(&idev->lock);
4114
4115 /* send a neighbour solicitation for our addr */
4116 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4117 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4118 ifp->dad_nonce);
4119 out:
4120 in6_ifa_put(ifp);
4121 rtnl_unlock();
4122 }
4123
4124 /* ifp->idev must be at least read locked */
4125 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4126 {
4127 struct inet6_ifaddr *ifpiter;
4128 struct inet6_dev *idev = ifp->idev;
4129
4130 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4131 if (ifpiter->scope > IFA_LINK)
4132 break;
4133 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4134 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4135 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4136 IFA_F_PERMANENT)
4137 return false;
4138 }
4139 return true;
4140 }
4141
4142 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4143 bool send_na)
4144 {
4145 struct net_device *dev = ifp->idev->dev;
4146 struct in6_addr lladdr;
4147 bool send_rs, send_mld;
4148
4149 addrconf_del_dad_work(ifp);
4150
4151 /*
4152 * Configure the address for reception. Now it is valid.
4153 */
4154
4155 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4156
4157 /* If added prefix is link local and we are prepared to process
4158 router advertisements, start sending router solicitations.
4159 */
4160
4161 read_lock_bh(&ifp->idev->lock);
4162 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4163 send_rs = send_mld &&
4164 ipv6_accept_ra(ifp->idev) &&
4165 ifp->idev->cnf.rtr_solicits != 0 &&
4166 (dev->flags&IFF_LOOPBACK) == 0;
4167 read_unlock_bh(&ifp->idev->lock);
4168
4169 /* While dad is in progress mld report's source address is in6_addrany.
4170 * Resend with proper ll now.
4171 */
4172 if (send_mld)
4173 ipv6_mc_dad_complete(ifp->idev);
4174
4175 /* send unsolicited NA if enabled */
4176 if (send_na &&
4177 (ifp->idev->cnf.ndisc_notify ||
4178 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4179 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4180 /*router=*/ !!ifp->idev->cnf.forwarding,
4181 /*solicited=*/ false, /*override=*/ true,
4182 /*inc_opt=*/ true);
4183 }
4184
4185 if (send_rs) {
4186 /*
4187 * If a host as already performed a random delay
4188 * [...] as part of DAD [...] there is no need
4189 * to delay again before sending the first RS
4190 */
4191 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4192 return;
4193 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4194
4195 write_lock_bh(&ifp->idev->lock);
4196 spin_lock(&ifp->lock);
4197 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4198 ifp->idev->cnf.rtr_solicit_interval);
4199 ifp->idev->rs_probes = 1;
4200 ifp->idev->if_flags |= IF_RS_SENT;
4201 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4202 spin_unlock(&ifp->lock);
4203 write_unlock_bh(&ifp->idev->lock);
4204 }
4205
4206 if (bump_id)
4207 rt_genid_bump_ipv6(dev_net(dev));
4208
4209 /* Make sure that a new temporary address will be created
4210 * before this temporary address becomes deprecated.
4211 */
4212 if (ifp->flags & IFA_F_TEMPORARY)
4213 addrconf_verify_rtnl();
4214 }
4215
4216 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4217 {
4218 struct inet6_ifaddr *ifp;
4219
4220 read_lock_bh(&idev->lock);
4221 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4222 spin_lock(&ifp->lock);
4223 if ((ifp->flags & IFA_F_TENTATIVE &&
4224 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4225 if (restart)
4226 ifp->state = INET6_IFADDR_STATE_PREDAD;
4227 addrconf_dad_kick(ifp);
4228 }
4229 spin_unlock(&ifp->lock);
4230 }
4231 read_unlock_bh(&idev->lock);
4232 }
4233
4234 #ifdef CONFIG_PROC_FS
4235 struct if6_iter_state {
4236 struct seq_net_private p;
4237 int bucket;
4238 int offset;
4239 };
4240
4241 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4242 {
4243 struct if6_iter_state *state = seq->private;
4244 struct net *net = seq_file_net(seq);
4245 struct inet6_ifaddr *ifa = NULL;
4246 int p = 0;
4247
4248 /* initial bucket if pos is 0 */
4249 if (pos == 0) {
4250 state->bucket = 0;
4251 state->offset = 0;
4252 }
4253
4254 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4255 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4256 addr_lst) {
4257 if (!net_eq(dev_net(ifa->idev->dev), net))
4258 continue;
4259 /* sync with offset */
4260 if (p < state->offset) {
4261 p++;
4262 continue;
4263 }
4264 return ifa;
4265 }
4266
4267 /* prepare for next bucket */
4268 state->offset = 0;
4269 p = 0;
4270 }
4271 return NULL;
4272 }
4273
4274 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4275 struct inet6_ifaddr *ifa)
4276 {
4277 struct if6_iter_state *state = seq->private;
4278 struct net *net = seq_file_net(seq);
4279
4280 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4281 if (!net_eq(dev_net(ifa->idev->dev), net))
4282 continue;
4283 state->offset++;
4284 return ifa;
4285 }
4286
4287 state->offset = 0;
4288 while (++state->bucket < IN6_ADDR_HSIZE) {
4289 hlist_for_each_entry_rcu(ifa,
4290 &inet6_addr_lst[state->bucket], addr_lst) {
4291 if (!net_eq(dev_net(ifa->idev->dev), net))
4292 continue;
4293 return ifa;
4294 }
4295 }
4296
4297 return NULL;
4298 }
4299
4300 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4301 __acquires(rcu)
4302 {
4303 rcu_read_lock();
4304 return if6_get_first(seq, *pos);
4305 }
4306
4307 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4308 {
4309 struct inet6_ifaddr *ifa;
4310
4311 ifa = if6_get_next(seq, v);
4312 ++*pos;
4313 return ifa;
4314 }
4315
4316 static void if6_seq_stop(struct seq_file *seq, void *v)
4317 __releases(rcu)
4318 {
4319 rcu_read_unlock();
4320 }
4321
4322 static int if6_seq_show(struct seq_file *seq, void *v)
4323 {
4324 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4325 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4326 &ifp->addr,
4327 ifp->idev->dev->ifindex,
4328 ifp->prefix_len,
4329 ifp->scope,
4330 (u8) ifp->flags,
4331 ifp->idev->dev->name);
4332 return 0;
4333 }
4334
4335 static const struct seq_operations if6_seq_ops = {
4336 .start = if6_seq_start,
4337 .next = if6_seq_next,
4338 .show = if6_seq_show,
4339 .stop = if6_seq_stop,
4340 };
4341
4342 static int __net_init if6_proc_net_init(struct net *net)
4343 {
4344 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4345 sizeof(struct if6_iter_state)))
4346 return -ENOMEM;
4347 return 0;
4348 }
4349
4350 static void __net_exit if6_proc_net_exit(struct net *net)
4351 {
4352 remove_proc_entry("if_inet6", net->proc_net);
4353 }
4354
4355 static struct pernet_operations if6_proc_net_ops = {
4356 .init = if6_proc_net_init,
4357 .exit = if6_proc_net_exit,
4358 };
4359
4360 int __init if6_proc_init(void)
4361 {
4362 return register_pernet_subsys(&if6_proc_net_ops);
4363 }
4364
4365 void if6_proc_exit(void)
4366 {
4367 unregister_pernet_subsys(&if6_proc_net_ops);
4368 }
4369 #endif /* CONFIG_PROC_FS */
4370
4371 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4372 /* Check if address is a home address configured on any interface. */
4373 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4374 {
4375 unsigned int hash = inet6_addr_hash(net, addr);
4376 struct inet6_ifaddr *ifp = NULL;
4377 int ret = 0;
4378
4379 rcu_read_lock();
4380 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4381 if (!net_eq(dev_net(ifp->idev->dev), net))
4382 continue;
4383 if (ipv6_addr_equal(&ifp->addr, addr) &&
4384 (ifp->flags & IFA_F_HOMEADDRESS)) {
4385 ret = 1;
4386 break;
4387 }
4388 }
4389 rcu_read_unlock();
4390 return ret;
4391 }
4392 #endif
4393
4394 /*
4395 * Periodic address status verification
4396 */
4397
4398 static void addrconf_verify_rtnl(void)
4399 {
4400 unsigned long now, next, next_sec, next_sched;
4401 struct inet6_ifaddr *ifp;
4402 int i;
4403
4404 ASSERT_RTNL();
4405
4406 rcu_read_lock_bh();
4407 now = jiffies;
4408 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4409
4410 cancel_delayed_work(&addr_chk_work);
4411
4412 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4413 restart:
4414 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4415 unsigned long age;
4416
4417 /* When setting preferred_lft to a value not zero or
4418 * infinity, while valid_lft is infinity
4419 * IFA_F_PERMANENT has a non-infinity life time.
4420 */
4421 if ((ifp->flags & IFA_F_PERMANENT) &&
4422 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4423 continue;
4424
4425 spin_lock(&ifp->lock);
4426 /* We try to batch several events at once. */
4427 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4428
4429 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4430 age >= ifp->valid_lft) {
4431 spin_unlock(&ifp->lock);
4432 in6_ifa_hold(ifp);
4433 ipv6_del_addr(ifp);
4434 goto restart;
4435 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4436 spin_unlock(&ifp->lock);
4437 continue;
4438 } else if (age >= ifp->prefered_lft) {
4439 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4440 int deprecate = 0;
4441
4442 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4443 deprecate = 1;
4444 ifp->flags |= IFA_F_DEPRECATED;
4445 }
4446
4447 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4448 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4449 next = ifp->tstamp + ifp->valid_lft * HZ;
4450
4451 spin_unlock(&ifp->lock);
4452
4453 if (deprecate) {
4454 in6_ifa_hold(ifp);
4455
4456 ipv6_ifa_notify(0, ifp);
4457 in6_ifa_put(ifp);
4458 goto restart;
4459 }
4460 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4461 !(ifp->flags&IFA_F_TENTATIVE)) {
4462 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4463 ifp->idev->cnf.dad_transmits *
4464 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4465
4466 if (age >= ifp->prefered_lft - regen_advance) {
4467 struct inet6_ifaddr *ifpub = ifp->ifpub;
4468 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4469 next = ifp->tstamp + ifp->prefered_lft * HZ;
4470 if (!ifp->regen_count && ifpub) {
4471 ifp->regen_count++;
4472 in6_ifa_hold(ifp);
4473 in6_ifa_hold(ifpub);
4474 spin_unlock(&ifp->lock);
4475
4476 spin_lock(&ifpub->lock);
4477 ifpub->regen_count = 0;
4478 spin_unlock(&ifpub->lock);
4479 rcu_read_unlock_bh();
4480 ipv6_create_tempaddr(ifpub, ifp, true);
4481 in6_ifa_put(ifpub);
4482 in6_ifa_put(ifp);
4483 rcu_read_lock_bh();
4484 goto restart;
4485 }
4486 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4487 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4488 spin_unlock(&ifp->lock);
4489 } else {
4490 /* ifp->prefered_lft <= ifp->valid_lft */
4491 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4492 next = ifp->tstamp + ifp->prefered_lft * HZ;
4493 spin_unlock(&ifp->lock);
4494 }
4495 }
4496 }
4497
4498 next_sec = round_jiffies_up(next);
4499 next_sched = next;
4500
4501 /* If rounded timeout is accurate enough, accept it. */
4502 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4503 next_sched = next_sec;
4504
4505 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4506 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4507 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4508
4509 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4510 now, next, next_sec, next_sched);
4511 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4512 rcu_read_unlock_bh();
4513 }
4514
4515 static void addrconf_verify_work(struct work_struct *w)
4516 {
4517 rtnl_lock();
4518 addrconf_verify_rtnl();
4519 rtnl_unlock();
4520 }
4521
4522 static void addrconf_verify(void)
4523 {
4524 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4525 }
4526
4527 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4528 struct in6_addr **peer_pfx)
4529 {
4530 struct in6_addr *pfx = NULL;
4531
4532 *peer_pfx = NULL;
4533
4534 if (addr)
4535 pfx = nla_data(addr);
4536
4537 if (local) {
4538 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4539 *peer_pfx = pfx;
4540 pfx = nla_data(local);
4541 }
4542
4543 return pfx;
4544 }
4545
4546 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4547 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4548 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4549 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4550 [IFA_FLAGS] = { .len = sizeof(u32) },
4551 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4552 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4553 };
4554
4555 static int
4556 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4557 struct netlink_ext_ack *extack)
4558 {
4559 struct net *net = sock_net(skb->sk);
4560 struct ifaddrmsg *ifm;
4561 struct nlattr *tb[IFA_MAX+1];
4562 struct in6_addr *pfx, *peer_pfx;
4563 u32 ifa_flags;
4564 int err;
4565
4566 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4567 extack);
4568 if (err < 0)
4569 return err;
4570
4571 ifm = nlmsg_data(nlh);
4572 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4573 if (!pfx)
4574 return -EINVAL;
4575
4576 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4577
4578 /* We ignore other flags so far. */
4579 ifa_flags &= IFA_F_MANAGETEMPADDR;
4580
4581 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4582 ifm->ifa_prefixlen);
4583 }
4584
4585 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4586 unsigned long expires, u32 flags)
4587 {
4588 struct fib6_info *f6i;
4589 u32 prio;
4590
4591 f6i = addrconf_get_prefix_route(&ifp->addr,
4592 ifp->prefix_len,
4593 ifp->idev->dev,
4594 0, RTF_GATEWAY | RTF_DEFAULT);
4595 if (!f6i)
4596 return -ENOENT;
4597
4598 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4599 if (f6i->fib6_metric != prio) {
4600 /* delete old one */
4601 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4602
4603 /* add new one */
4604 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4605 ifp->rt_priority, ifp->idev->dev,
4606 expires, flags, GFP_KERNEL);
4607 } else {
4608 if (!expires)
4609 fib6_clean_expires(f6i);
4610 else
4611 fib6_set_expires(f6i, expires);
4612
4613 fib6_info_release(f6i);
4614 }
4615
4616 return 0;
4617 }
4618
4619 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4620 {
4621 u32 flags;
4622 clock_t expires;
4623 unsigned long timeout;
4624 bool was_managetempaddr;
4625 bool had_prefixroute;
4626
4627 ASSERT_RTNL();
4628
4629 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4630 return -EINVAL;
4631
4632 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4633 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4634 return -EINVAL;
4635
4636 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4637 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4638
4639 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4640 if (addrconf_finite_timeout(timeout)) {
4641 expires = jiffies_to_clock_t(timeout * HZ);
4642 cfg->valid_lft = timeout;
4643 flags = RTF_EXPIRES;
4644 } else {
4645 expires = 0;
4646 flags = 0;
4647 cfg->ifa_flags |= IFA_F_PERMANENT;
4648 }
4649
4650 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4651 if (addrconf_finite_timeout(timeout)) {
4652 if (timeout == 0)
4653 cfg->ifa_flags |= IFA_F_DEPRECATED;
4654 cfg->preferred_lft = timeout;
4655 }
4656
4657 spin_lock_bh(&ifp->lock);
4658 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4659 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4660 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4661 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4662 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4663 IFA_F_NOPREFIXROUTE);
4664 ifp->flags |= cfg->ifa_flags;
4665 ifp->tstamp = jiffies;
4666 ifp->valid_lft = cfg->valid_lft;
4667 ifp->prefered_lft = cfg->preferred_lft;
4668
4669 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4670 ifp->rt_priority = cfg->rt_priority;
4671
4672 spin_unlock_bh(&ifp->lock);
4673 if (!(ifp->flags&IFA_F_TENTATIVE))
4674 ipv6_ifa_notify(0, ifp);
4675
4676 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4677 int rc = -ENOENT;
4678
4679 if (had_prefixroute)
4680 rc = modify_prefix_route(ifp, expires, flags);
4681
4682 /* prefix route could have been deleted; if so restore it */
4683 if (rc == -ENOENT) {
4684 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4685 ifp->rt_priority, ifp->idev->dev,
4686 expires, flags, GFP_KERNEL);
4687 }
4688 } else if (had_prefixroute) {
4689 enum cleanup_prefix_rt_t action;
4690 unsigned long rt_expires;
4691
4692 write_lock_bh(&ifp->idev->lock);
4693 action = check_cleanup_prefix_route(ifp, &rt_expires);
4694 write_unlock_bh(&ifp->idev->lock);
4695
4696 if (action != CLEANUP_PREFIX_RT_NOP) {
4697 cleanup_prefix_route(ifp, rt_expires,
4698 action == CLEANUP_PREFIX_RT_DEL);
4699 }
4700 }
4701
4702 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4703 if (was_managetempaddr &&
4704 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4705 cfg->valid_lft = 0;
4706 cfg->preferred_lft = 0;
4707 }
4708 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4709 cfg->preferred_lft, !was_managetempaddr,
4710 jiffies);
4711 }
4712
4713 addrconf_verify_rtnl();
4714
4715 return 0;
4716 }
4717
4718 static int
4719 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4720 struct netlink_ext_ack *extack)
4721 {
4722 struct net *net = sock_net(skb->sk);
4723 struct ifaddrmsg *ifm;
4724 struct nlattr *tb[IFA_MAX+1];
4725 struct in6_addr *peer_pfx;
4726 struct inet6_ifaddr *ifa;
4727 struct net_device *dev;
4728 struct inet6_dev *idev;
4729 struct ifa6_config cfg;
4730 int err;
4731
4732 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4733 extack);
4734 if (err < 0)
4735 return err;
4736
4737 memset(&cfg, 0, sizeof(cfg));
4738
4739 ifm = nlmsg_data(nlh);
4740 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4741 if (!cfg.pfx)
4742 return -EINVAL;
4743
4744 cfg.peer_pfx = peer_pfx;
4745 cfg.plen = ifm->ifa_prefixlen;
4746 if (tb[IFA_RT_PRIORITY])
4747 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4748
4749 cfg.valid_lft = INFINITY_LIFE_TIME;
4750 cfg.preferred_lft = INFINITY_LIFE_TIME;
4751
4752 if (tb[IFA_CACHEINFO]) {
4753 struct ifa_cacheinfo *ci;
4754
4755 ci = nla_data(tb[IFA_CACHEINFO]);
4756 cfg.valid_lft = ci->ifa_valid;
4757 cfg.preferred_lft = ci->ifa_prefered;
4758 }
4759
4760 dev = __dev_get_by_index(net, ifm->ifa_index);
4761 if (!dev)
4762 return -ENODEV;
4763
4764 if (tb[IFA_FLAGS])
4765 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4766 else
4767 cfg.ifa_flags = ifm->ifa_flags;
4768
4769 /* We ignore other flags so far. */
4770 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4771 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4772 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4773
4774 idev = ipv6_find_idev(dev);
4775 if (!idev)
4776 return -ENOBUFS;
4777
4778 if (!ipv6_allow_optimistic_dad(net, idev))
4779 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4780
4781 if (cfg.ifa_flags & IFA_F_NODAD &&
4782 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4783 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4784 return -EINVAL;
4785 }
4786
4787 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4788 if (!ifa) {
4789 /*
4790 * It would be best to check for !NLM_F_CREATE here but
4791 * userspace already relies on not having to provide this.
4792 */
4793 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4794 }
4795
4796 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4797 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4798 err = -EEXIST;
4799 else
4800 err = inet6_addr_modify(ifa, &cfg);
4801
4802 in6_ifa_put(ifa);
4803
4804 return err;
4805 }
4806
4807 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4808 u8 scope, int ifindex)
4809 {
4810 struct ifaddrmsg *ifm;
4811
4812 ifm = nlmsg_data(nlh);
4813 ifm->ifa_family = AF_INET6;
4814 ifm->ifa_prefixlen = prefixlen;
4815 ifm->ifa_flags = flags;
4816 ifm->ifa_scope = scope;
4817 ifm->ifa_index = ifindex;
4818 }
4819
4820 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4821 unsigned long tstamp, u32 preferred, u32 valid)
4822 {
4823 struct ifa_cacheinfo ci;
4824
4825 ci.cstamp = cstamp_delta(cstamp);
4826 ci.tstamp = cstamp_delta(tstamp);
4827 ci.ifa_prefered = preferred;
4828 ci.ifa_valid = valid;
4829
4830 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4831 }
4832
4833 static inline int rt_scope(int ifa_scope)
4834 {
4835 if (ifa_scope & IFA_HOST)
4836 return RT_SCOPE_HOST;
4837 else if (ifa_scope & IFA_LINK)
4838 return RT_SCOPE_LINK;
4839 else if (ifa_scope & IFA_SITE)
4840 return RT_SCOPE_SITE;
4841 else
4842 return RT_SCOPE_UNIVERSE;
4843 }
4844
4845 static inline int inet6_ifaddr_msgsize(void)
4846 {
4847 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4848 + nla_total_size(16) /* IFA_LOCAL */
4849 + nla_total_size(16) /* IFA_ADDRESS */
4850 + nla_total_size(sizeof(struct ifa_cacheinfo))
4851 + nla_total_size(4) /* IFA_FLAGS */
4852 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4853 }
4854
4855 enum addr_type_t {
4856 UNICAST_ADDR,
4857 MULTICAST_ADDR,
4858 ANYCAST_ADDR,
4859 };
4860
4861 struct inet6_fill_args {
4862 u32 portid;
4863 u32 seq;
4864 int event;
4865 unsigned int flags;
4866 int netnsid;
4867 int ifindex;
4868 enum addr_type_t type;
4869 };
4870
4871 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4872 struct inet6_fill_args *args)
4873 {
4874 struct nlmsghdr *nlh;
4875 u32 preferred, valid;
4876
4877 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4878 sizeof(struct ifaddrmsg), args->flags);
4879 if (!nlh)
4880 return -EMSGSIZE;
4881
4882 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4883 ifa->idev->dev->ifindex);
4884
4885 if (args->netnsid >= 0 &&
4886 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4887 goto error;
4888
4889 if (!((ifa->flags&IFA_F_PERMANENT) &&
4890 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4891 preferred = ifa->prefered_lft;
4892 valid = ifa->valid_lft;
4893 if (preferred != INFINITY_LIFE_TIME) {
4894 long tval = (jiffies - ifa->tstamp)/HZ;
4895 if (preferred > tval)
4896 preferred -= tval;
4897 else
4898 preferred = 0;
4899 if (valid != INFINITY_LIFE_TIME) {
4900 if (valid > tval)
4901 valid -= tval;
4902 else
4903 valid = 0;
4904 }
4905 }
4906 } else {
4907 preferred = INFINITY_LIFE_TIME;
4908 valid = INFINITY_LIFE_TIME;
4909 }
4910
4911 if (!ipv6_addr_any(&ifa->peer_addr)) {
4912 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4913 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4914 goto error;
4915 } else
4916 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4917 goto error;
4918
4919 if (ifa->rt_priority &&
4920 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4921 goto error;
4922
4923 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4924 goto error;
4925
4926 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4927 goto error;
4928
4929 nlmsg_end(skb, nlh);
4930 return 0;
4931
4932 error:
4933 nlmsg_cancel(skb, nlh);
4934 return -EMSGSIZE;
4935 }
4936
4937 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4938 struct inet6_fill_args *args)
4939 {
4940 struct nlmsghdr *nlh;
4941 u8 scope = RT_SCOPE_UNIVERSE;
4942 int ifindex = ifmca->idev->dev->ifindex;
4943
4944 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4945 scope = RT_SCOPE_SITE;
4946
4947 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4948 sizeof(struct ifaddrmsg), args->flags);
4949 if (!nlh)
4950 return -EMSGSIZE;
4951
4952 if (args->netnsid >= 0 &&
4953 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4954 return -EMSGSIZE;
4955
4956 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4957 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4958 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4959 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4960 nlmsg_cancel(skb, nlh);
4961 return -EMSGSIZE;
4962 }
4963
4964 nlmsg_end(skb, nlh);
4965 return 0;
4966 }
4967
4968 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4969 struct inet6_fill_args *args)
4970 {
4971 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
4972 int ifindex = dev ? dev->ifindex : 1;
4973 struct nlmsghdr *nlh;
4974 u8 scope = RT_SCOPE_UNIVERSE;
4975
4976 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4977 scope = RT_SCOPE_SITE;
4978
4979 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4980 sizeof(struct ifaddrmsg), args->flags);
4981 if (!nlh)
4982 return -EMSGSIZE;
4983
4984 if (args->netnsid >= 0 &&
4985 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4986 return -EMSGSIZE;
4987
4988 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4989 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4990 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4991 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4992 nlmsg_cancel(skb, nlh);
4993 return -EMSGSIZE;
4994 }
4995
4996 nlmsg_end(skb, nlh);
4997 return 0;
4998 }
4999
5000 /* called with rcu_read_lock() */
5001 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5002 struct netlink_callback *cb, int s_ip_idx,
5003 struct inet6_fill_args *fillargs)
5004 {
5005 struct ifmcaddr6 *ifmca;
5006 struct ifacaddr6 *ifaca;
5007 int ip_idx = 0;
5008 int err = 1;
5009
5010 read_lock_bh(&idev->lock);
5011 switch (fillargs->type) {
5012 case UNICAST_ADDR: {
5013 struct inet6_ifaddr *ifa;
5014 fillargs->event = RTM_NEWADDR;
5015
5016 /* unicast address incl. temp addr */
5017 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5018 if (ip_idx < s_ip_idx)
5019 goto next;
5020 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5021 if (err < 0)
5022 break;
5023 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5024 next:
5025 ip_idx++;
5026 }
5027 break;
5028 }
5029 case MULTICAST_ADDR:
5030 fillargs->event = RTM_GETMULTICAST;
5031
5032 /* multicast address */
5033 for (ifmca = idev->mc_list; ifmca;
5034 ifmca = ifmca->next, ip_idx++) {
5035 if (ip_idx < s_ip_idx)
5036 continue;
5037 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5038 if (err < 0)
5039 break;
5040 }
5041 break;
5042 case ANYCAST_ADDR:
5043 fillargs->event = RTM_GETANYCAST;
5044 /* anycast address */
5045 for (ifaca = idev->ac_list; ifaca;
5046 ifaca = ifaca->aca_next, ip_idx++) {
5047 if (ip_idx < s_ip_idx)
5048 continue;
5049 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5050 if (err < 0)
5051 break;
5052 }
5053 break;
5054 default:
5055 break;
5056 }
5057 read_unlock_bh(&idev->lock);
5058 cb->args[2] = ip_idx;
5059 return err;
5060 }
5061
5062 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5063 struct inet6_fill_args *fillargs,
5064 struct net **tgt_net, struct sock *sk,
5065 struct netlink_callback *cb)
5066 {
5067 struct netlink_ext_ack *extack = cb->extack;
5068 struct nlattr *tb[IFA_MAX+1];
5069 struct ifaddrmsg *ifm;
5070 int err, i;
5071
5072 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5073 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5074 return -EINVAL;
5075 }
5076
5077 ifm = nlmsg_data(nlh);
5078 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5079 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5080 return -EINVAL;
5081 }
5082
5083 fillargs->ifindex = ifm->ifa_index;
5084 if (fillargs->ifindex) {
5085 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5086 fillargs->flags |= NLM_F_DUMP_FILTERED;
5087 }
5088
5089 err = nlmsg_parse_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5090 ifa_ipv6_policy, extack);
5091 if (err < 0)
5092 return err;
5093
5094 for (i = 0; i <= IFA_MAX; ++i) {
5095 if (!tb[i])
5096 continue;
5097
5098 if (i == IFA_TARGET_NETNSID) {
5099 struct net *net;
5100
5101 fillargs->netnsid = nla_get_s32(tb[i]);
5102 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5103 if (IS_ERR(net)) {
5104 fillargs->netnsid = -1;
5105 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5106 return PTR_ERR(net);
5107 }
5108 *tgt_net = net;
5109 } else {
5110 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5111 return -EINVAL;
5112 }
5113 }
5114
5115 return 0;
5116 }
5117
5118 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5119 enum addr_type_t type)
5120 {
5121 const struct nlmsghdr *nlh = cb->nlh;
5122 struct inet6_fill_args fillargs = {
5123 .portid = NETLINK_CB(cb->skb).portid,
5124 .seq = cb->nlh->nlmsg_seq,
5125 .flags = NLM_F_MULTI,
5126 .netnsid = -1,
5127 .type = type,
5128 };
5129 struct net *net = sock_net(skb->sk);
5130 struct net *tgt_net = net;
5131 int idx, s_idx, s_ip_idx;
5132 int h, s_h;
5133 struct net_device *dev;
5134 struct inet6_dev *idev;
5135 struct hlist_head *head;
5136 int err = 0;
5137
5138 s_h = cb->args[0];
5139 s_idx = idx = cb->args[1];
5140 s_ip_idx = cb->args[2];
5141
5142 if (cb->strict_check) {
5143 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5144 skb->sk, cb);
5145 if (err < 0)
5146 goto put_tgt_net;
5147
5148 err = 0;
5149 if (fillargs.ifindex) {
5150 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5151 if (!dev) {
5152 err = -ENODEV;
5153 goto put_tgt_net;
5154 }
5155 idev = __in6_dev_get(dev);
5156 if (idev) {
5157 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5158 &fillargs);
5159 if (err > 0)
5160 err = 0;
5161 }
5162 goto put_tgt_net;
5163 }
5164 }
5165
5166 rcu_read_lock();
5167 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5168 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5169 idx = 0;
5170 head = &tgt_net->dev_index_head[h];
5171 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5172 if (idx < s_idx)
5173 goto cont;
5174 if (h > s_h || idx > s_idx)
5175 s_ip_idx = 0;
5176 idev = __in6_dev_get(dev);
5177 if (!idev)
5178 goto cont;
5179
5180 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5181 &fillargs) < 0)
5182 goto done;
5183 cont:
5184 idx++;
5185 }
5186 }
5187 done:
5188 rcu_read_unlock();
5189 cb->args[0] = h;
5190 cb->args[1] = idx;
5191 put_tgt_net:
5192 if (fillargs.netnsid >= 0)
5193 put_net(tgt_net);
5194
5195 return skb->len ? : err;
5196 }
5197
5198 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5199 {
5200 enum addr_type_t type = UNICAST_ADDR;
5201
5202 return inet6_dump_addr(skb, cb, type);
5203 }
5204
5205 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5206 {
5207 enum addr_type_t type = MULTICAST_ADDR;
5208
5209 return inet6_dump_addr(skb, cb, type);
5210 }
5211
5212
5213 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5214 {
5215 enum addr_type_t type = ANYCAST_ADDR;
5216
5217 return inet6_dump_addr(skb, cb, type);
5218 }
5219
5220 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5221 const struct nlmsghdr *nlh,
5222 struct nlattr **tb,
5223 struct netlink_ext_ack *extack)
5224 {
5225 struct ifaddrmsg *ifm;
5226 int i, err;
5227
5228 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5229 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5230 return -EINVAL;
5231 }
5232
5233 ifm = nlmsg_data(nlh);
5234 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5235 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5236 return -EINVAL;
5237 }
5238
5239 if (!netlink_strict_get_check(skb))
5240 return nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX,
5241 ifa_ipv6_policy, extack);
5242
5243 err = nlmsg_parse_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5244 ifa_ipv6_policy, extack);
5245 if (err)
5246 return err;
5247
5248 for (i = 0; i <= IFA_MAX; i++) {
5249 if (!tb[i])
5250 continue;
5251
5252 switch (i) {
5253 case IFA_TARGET_NETNSID:
5254 case IFA_ADDRESS:
5255 case IFA_LOCAL:
5256 break;
5257 default:
5258 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5259 return -EINVAL;
5260 }
5261 }
5262
5263 return 0;
5264 }
5265
5266 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5267 struct netlink_ext_ack *extack)
5268 {
5269 struct net *net = sock_net(in_skb->sk);
5270 struct inet6_fill_args fillargs = {
5271 .portid = NETLINK_CB(in_skb).portid,
5272 .seq = nlh->nlmsg_seq,
5273 .event = RTM_NEWADDR,
5274 .flags = 0,
5275 .netnsid = -1,
5276 };
5277 struct net *tgt_net = net;
5278 struct ifaddrmsg *ifm;
5279 struct nlattr *tb[IFA_MAX+1];
5280 struct in6_addr *addr = NULL, *peer;
5281 struct net_device *dev = NULL;
5282 struct inet6_ifaddr *ifa;
5283 struct sk_buff *skb;
5284 int err;
5285
5286 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5287 if (err < 0)
5288 return err;
5289
5290 if (tb[IFA_TARGET_NETNSID]) {
5291 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5292
5293 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5294 fillargs.netnsid);
5295 if (IS_ERR(tgt_net))
5296 return PTR_ERR(tgt_net);
5297 }
5298
5299 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5300 if (!addr)
5301 return -EINVAL;
5302
5303 ifm = nlmsg_data(nlh);
5304 if (ifm->ifa_index)
5305 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5306
5307 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5308 if (!ifa) {
5309 err = -EADDRNOTAVAIL;
5310 goto errout;
5311 }
5312
5313 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5314 if (!skb) {
5315 err = -ENOBUFS;
5316 goto errout_ifa;
5317 }
5318
5319 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5320 if (err < 0) {
5321 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5322 WARN_ON(err == -EMSGSIZE);
5323 kfree_skb(skb);
5324 goto errout_ifa;
5325 }
5326 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5327 errout_ifa:
5328 in6_ifa_put(ifa);
5329 errout:
5330 if (dev)
5331 dev_put(dev);
5332 if (fillargs.netnsid >= 0)
5333 put_net(tgt_net);
5334
5335 return err;
5336 }
5337
5338 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5339 {
5340 struct sk_buff *skb;
5341 struct net *net = dev_net(ifa->idev->dev);
5342 struct inet6_fill_args fillargs = {
5343 .portid = 0,
5344 .seq = 0,
5345 .event = event,
5346 .flags = 0,
5347 .netnsid = -1,
5348 };
5349 int err = -ENOBUFS;
5350
5351 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5352 if (!skb)
5353 goto errout;
5354
5355 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5356 if (err < 0) {
5357 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5358 WARN_ON(err == -EMSGSIZE);
5359 kfree_skb(skb);
5360 goto errout;
5361 }
5362 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5363 return;
5364 errout:
5365 if (err < 0)
5366 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5367 }
5368
5369 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5370 __s32 *array, int bytes)
5371 {
5372 BUG_ON(bytes < (DEVCONF_MAX * 4));
5373
5374 memset(array, 0, bytes);
5375 array[DEVCONF_FORWARDING] = cnf->forwarding;
5376 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5377 array[DEVCONF_MTU6] = cnf->mtu6;
5378 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5379 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5380 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5381 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5382 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5383 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5384 jiffies_to_msecs(cnf->rtr_solicit_interval);
5385 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5386 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5387 array[DEVCONF_RTR_SOLICIT_DELAY] =
5388 jiffies_to_msecs(cnf->rtr_solicit_delay);
5389 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5390 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5391 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5392 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5393 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5394 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5395 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5396 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5397 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5398 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5399 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5400 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5401 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5402 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5403 #ifdef CONFIG_IPV6_ROUTER_PREF
5404 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5405 array[DEVCONF_RTR_PROBE_INTERVAL] =
5406 jiffies_to_msecs(cnf->rtr_probe_interval);
5407 #ifdef CONFIG_IPV6_ROUTE_INFO
5408 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5409 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5410 #endif
5411 #endif
5412 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5413 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5414 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5415 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5416 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5417 #endif
5418 #ifdef CONFIG_IPV6_MROUTE
5419 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5420 #endif
5421 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5422 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5423 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5424 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5425 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5426 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5427 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5428 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5429 /* we omit DEVCONF_STABLE_SECRET for now */
5430 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5431 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5432 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5433 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5434 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5435 #ifdef CONFIG_IPV6_SEG6_HMAC
5436 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5437 #endif
5438 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5439 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5440 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5441 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5442 }
5443
5444 static inline size_t inet6_ifla6_size(void)
5445 {
5446 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5447 + nla_total_size(sizeof(struct ifla_cacheinfo))
5448 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5449 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5450 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5451 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5452 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5453 + 0;
5454 }
5455
5456 static inline size_t inet6_if_nlmsg_size(void)
5457 {
5458 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5459 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5460 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5461 + nla_total_size(4) /* IFLA_MTU */
5462 + nla_total_size(4) /* IFLA_LINK */
5463 + nla_total_size(1) /* IFLA_OPERSTATE */
5464 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5465 }
5466
5467 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5468 int bytes)
5469 {
5470 int i;
5471 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5472 BUG_ON(pad < 0);
5473
5474 /* Use put_unaligned() because stats may not be aligned for u64. */
5475 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5476 for (i = 1; i < ICMP6_MIB_MAX; i++)
5477 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5478
5479 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5480 }
5481
5482 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5483 int bytes, size_t syncpoff)
5484 {
5485 int i, c;
5486 u64 buff[IPSTATS_MIB_MAX];
5487 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5488
5489 BUG_ON(pad < 0);
5490
5491 memset(buff, 0, sizeof(buff));
5492 buff[0] = IPSTATS_MIB_MAX;
5493
5494 for_each_possible_cpu(c) {
5495 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5496 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5497 }
5498
5499 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5500 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5501 }
5502
5503 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5504 int bytes)
5505 {
5506 switch (attrtype) {
5507 case IFLA_INET6_STATS:
5508 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5509 offsetof(struct ipstats_mib, syncp));
5510 break;
5511 case IFLA_INET6_ICMP6STATS:
5512 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5513 break;
5514 }
5515 }
5516
5517 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5518 u32 ext_filter_mask)
5519 {
5520 struct nlattr *nla;
5521 struct ifla_cacheinfo ci;
5522
5523 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5524 goto nla_put_failure;
5525 ci.max_reasm_len = IPV6_MAXPLEN;
5526 ci.tstamp = cstamp_delta(idev->tstamp);
5527 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5528 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5529 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5530 goto nla_put_failure;
5531 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5532 if (!nla)
5533 goto nla_put_failure;
5534 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5535
5536 /* XXX - MC not implemented */
5537
5538 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5539 return 0;
5540
5541 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5542 if (!nla)
5543 goto nla_put_failure;
5544 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5545
5546 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5547 if (!nla)
5548 goto nla_put_failure;
5549 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5550
5551 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5552 if (!nla)
5553 goto nla_put_failure;
5554
5555 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5556 goto nla_put_failure;
5557
5558 read_lock_bh(&idev->lock);
5559 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5560 read_unlock_bh(&idev->lock);
5561
5562 return 0;
5563
5564 nla_put_failure:
5565 return -EMSGSIZE;
5566 }
5567
5568 static size_t inet6_get_link_af_size(const struct net_device *dev,
5569 u32 ext_filter_mask)
5570 {
5571 if (!__in6_dev_get(dev))
5572 return 0;
5573
5574 return inet6_ifla6_size();
5575 }
5576
5577 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5578 u32 ext_filter_mask)
5579 {
5580 struct inet6_dev *idev = __in6_dev_get(dev);
5581
5582 if (!idev)
5583 return -ENODATA;
5584
5585 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5586 return -EMSGSIZE;
5587
5588 return 0;
5589 }
5590
5591 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5592 {
5593 struct inet6_ifaddr *ifp;
5594 struct net_device *dev = idev->dev;
5595 bool clear_token, update_rs = false;
5596 struct in6_addr ll_addr;
5597
5598 ASSERT_RTNL();
5599
5600 if (!token)
5601 return -EINVAL;
5602 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5603 return -EINVAL;
5604 if (!ipv6_accept_ra(idev))
5605 return -EINVAL;
5606 if (idev->cnf.rtr_solicits == 0)
5607 return -EINVAL;
5608
5609 write_lock_bh(&idev->lock);
5610
5611 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5612 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5613
5614 write_unlock_bh(&idev->lock);
5615
5616 clear_token = ipv6_addr_any(token);
5617 if (clear_token)
5618 goto update_lft;
5619
5620 if (!idev->dead && (idev->if_flags & IF_READY) &&
5621 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5622 IFA_F_OPTIMISTIC)) {
5623 /* If we're not ready, then normal ifup will take care
5624 * of this. Otherwise, we need to request our rs here.
5625 */
5626 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5627 update_rs = true;
5628 }
5629
5630 update_lft:
5631 write_lock_bh(&idev->lock);
5632
5633 if (update_rs) {
5634 idev->if_flags |= IF_RS_SENT;
5635 idev->rs_interval = rfc3315_s14_backoff_init(
5636 idev->cnf.rtr_solicit_interval);
5637 idev->rs_probes = 1;
5638 addrconf_mod_rs_timer(idev, idev->rs_interval);
5639 }
5640
5641 /* Well, that's kinda nasty ... */
5642 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5643 spin_lock(&ifp->lock);
5644 if (ifp->tokenized) {
5645 ifp->valid_lft = 0;
5646 ifp->prefered_lft = 0;
5647 }
5648 spin_unlock(&ifp->lock);
5649 }
5650
5651 write_unlock_bh(&idev->lock);
5652 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5653 addrconf_verify_rtnl();
5654 return 0;
5655 }
5656
5657 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5658 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5659 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5660 };
5661
5662 static int inet6_validate_link_af(const struct net_device *dev,
5663 const struct nlattr *nla)
5664 {
5665 struct nlattr *tb[IFLA_INET6_MAX + 1];
5666
5667 if (dev && !__in6_dev_get(dev))
5668 return -EAFNOSUPPORT;
5669
5670 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5671 NULL);
5672 }
5673
5674 static int check_addr_gen_mode(int mode)
5675 {
5676 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5677 mode != IN6_ADDR_GEN_MODE_NONE &&
5678 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5679 mode != IN6_ADDR_GEN_MODE_RANDOM)
5680 return -EINVAL;
5681 return 1;
5682 }
5683
5684 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5685 int mode)
5686 {
5687 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5688 !idev->cnf.stable_secret.initialized &&
5689 !net->ipv6.devconf_dflt->stable_secret.initialized)
5690 return -EINVAL;
5691 return 1;
5692 }
5693
5694 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5695 {
5696 int err = -EINVAL;
5697 struct inet6_dev *idev = __in6_dev_get(dev);
5698 struct nlattr *tb[IFLA_INET6_MAX + 1];
5699
5700 if (!idev)
5701 return -EAFNOSUPPORT;
5702
5703 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5704 BUG();
5705
5706 if (tb[IFLA_INET6_TOKEN]) {
5707 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5708 if (err)
5709 return err;
5710 }
5711
5712 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5713 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5714
5715 if (check_addr_gen_mode(mode) < 0 ||
5716 check_stable_privacy(idev, dev_net(dev), mode) < 0)
5717 return -EINVAL;
5718
5719 idev->cnf.addr_gen_mode = mode;
5720 err = 0;
5721 }
5722
5723 return err;
5724 }
5725
5726 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5727 u32 portid, u32 seq, int event, unsigned int flags)
5728 {
5729 struct net_device *dev = idev->dev;
5730 struct ifinfomsg *hdr;
5731 struct nlmsghdr *nlh;
5732 void *protoinfo;
5733
5734 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5735 if (!nlh)
5736 return -EMSGSIZE;
5737
5738 hdr = nlmsg_data(nlh);
5739 hdr->ifi_family = AF_INET6;
5740 hdr->__ifi_pad = 0;
5741 hdr->ifi_type = dev->type;
5742 hdr->ifi_index = dev->ifindex;
5743 hdr->ifi_flags = dev_get_flags(dev);
5744 hdr->ifi_change = 0;
5745
5746 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5747 (dev->addr_len &&
5748 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5749 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5750 (dev->ifindex != dev_get_iflink(dev) &&
5751 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5752 nla_put_u8(skb, IFLA_OPERSTATE,
5753 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5754 goto nla_put_failure;
5755 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5756 if (!protoinfo)
5757 goto nla_put_failure;
5758
5759 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5760 goto nla_put_failure;
5761
5762 nla_nest_end(skb, protoinfo);
5763 nlmsg_end(skb, nlh);
5764 return 0;
5765
5766 nla_put_failure:
5767 nlmsg_cancel(skb, nlh);
5768 return -EMSGSIZE;
5769 }
5770
5771 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5772 struct netlink_ext_ack *extack)
5773 {
5774 struct ifinfomsg *ifm;
5775
5776 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5777 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5778 return -EINVAL;
5779 }
5780
5781 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5782 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5783 return -EINVAL;
5784 }
5785
5786 ifm = nlmsg_data(nlh);
5787 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5788 ifm->ifi_change || ifm->ifi_index) {
5789 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5790 return -EINVAL;
5791 }
5792
5793 return 0;
5794 }
5795
5796 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5797 {
5798 struct net *net = sock_net(skb->sk);
5799 int h, s_h;
5800 int idx = 0, s_idx;
5801 struct net_device *dev;
5802 struct inet6_dev *idev;
5803 struct hlist_head *head;
5804
5805 /* only requests using strict checking can pass data to
5806 * influence the dump
5807 */
5808 if (cb->strict_check) {
5809 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5810
5811 if (err < 0)
5812 return err;
5813 }
5814
5815 s_h = cb->args[0];
5816 s_idx = cb->args[1];
5817
5818 rcu_read_lock();
5819 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5820 idx = 0;
5821 head = &net->dev_index_head[h];
5822 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5823 if (idx < s_idx)
5824 goto cont;
5825 idev = __in6_dev_get(dev);
5826 if (!idev)
5827 goto cont;
5828 if (inet6_fill_ifinfo(skb, idev,
5829 NETLINK_CB(cb->skb).portid,
5830 cb->nlh->nlmsg_seq,
5831 RTM_NEWLINK, NLM_F_MULTI) < 0)
5832 goto out;
5833 cont:
5834 idx++;
5835 }
5836 }
5837 out:
5838 rcu_read_unlock();
5839 cb->args[1] = idx;
5840 cb->args[0] = h;
5841
5842 return skb->len;
5843 }
5844
5845 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5846 {
5847 struct sk_buff *skb;
5848 struct net *net = dev_net(idev->dev);
5849 int err = -ENOBUFS;
5850
5851 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5852 if (!skb)
5853 goto errout;
5854
5855 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5856 if (err < 0) {
5857 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5858 WARN_ON(err == -EMSGSIZE);
5859 kfree_skb(skb);
5860 goto errout;
5861 }
5862 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5863 return;
5864 errout:
5865 if (err < 0)
5866 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5867 }
5868
5869 static inline size_t inet6_prefix_nlmsg_size(void)
5870 {
5871 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5872 + nla_total_size(sizeof(struct in6_addr))
5873 + nla_total_size(sizeof(struct prefix_cacheinfo));
5874 }
5875
5876 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5877 struct prefix_info *pinfo, u32 portid, u32 seq,
5878 int event, unsigned int flags)
5879 {
5880 struct prefixmsg *pmsg;
5881 struct nlmsghdr *nlh;
5882 struct prefix_cacheinfo ci;
5883
5884 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5885 if (!nlh)
5886 return -EMSGSIZE;
5887
5888 pmsg = nlmsg_data(nlh);
5889 pmsg->prefix_family = AF_INET6;
5890 pmsg->prefix_pad1 = 0;
5891 pmsg->prefix_pad2 = 0;
5892 pmsg->prefix_ifindex = idev->dev->ifindex;
5893 pmsg->prefix_len = pinfo->prefix_len;
5894 pmsg->prefix_type = pinfo->type;
5895 pmsg->prefix_pad3 = 0;
5896 pmsg->prefix_flags = 0;
5897 if (pinfo->onlink)
5898 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5899 if (pinfo->autoconf)
5900 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5901
5902 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5903 goto nla_put_failure;
5904 ci.preferred_time = ntohl(pinfo->prefered);
5905 ci.valid_time = ntohl(pinfo->valid);
5906 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5907 goto nla_put_failure;
5908 nlmsg_end(skb, nlh);
5909 return 0;
5910
5911 nla_put_failure:
5912 nlmsg_cancel(skb, nlh);
5913 return -EMSGSIZE;
5914 }
5915
5916 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5917 struct prefix_info *pinfo)
5918 {
5919 struct sk_buff *skb;
5920 struct net *net = dev_net(idev->dev);
5921 int err = -ENOBUFS;
5922
5923 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5924 if (!skb)
5925 goto errout;
5926
5927 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5928 if (err < 0) {
5929 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5930 WARN_ON(err == -EMSGSIZE);
5931 kfree_skb(skb);
5932 goto errout;
5933 }
5934 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5935 return;
5936 errout:
5937 if (err < 0)
5938 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5939 }
5940
5941 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5942 {
5943 struct net *net = dev_net(ifp->idev->dev);
5944
5945 if (event)
5946 ASSERT_RTNL();
5947
5948 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5949
5950 switch (event) {
5951 case RTM_NEWADDR:
5952 /*
5953 * If the address was optimistic
5954 * we inserted the route at the start of
5955 * our DAD process, so we don't need
5956 * to do it again
5957 */
5958 if (!rcu_access_pointer(ifp->rt->fib6_node))
5959 ip6_ins_rt(net, ifp->rt);
5960 if (ifp->idev->cnf.forwarding)
5961 addrconf_join_anycast(ifp);
5962 if (!ipv6_addr_any(&ifp->peer_addr))
5963 addrconf_prefix_route(&ifp->peer_addr, 128, 0,
5964 ifp->idev->dev, 0, 0,
5965 GFP_ATOMIC);
5966 break;
5967 case RTM_DELADDR:
5968 if (ifp->idev->cnf.forwarding)
5969 addrconf_leave_anycast(ifp);
5970 addrconf_leave_solict(ifp->idev, &ifp->addr);
5971 if (!ipv6_addr_any(&ifp->peer_addr)) {
5972 struct fib6_info *rt;
5973
5974 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5975 ifp->idev->dev, 0, 0);
5976 if (rt)
5977 ip6_del_rt(net, rt);
5978 }
5979 if (ifp->rt) {
5980 ip6_del_rt(net, ifp->rt);
5981 ifp->rt = NULL;
5982 }
5983 rt_genid_bump_ipv6(net);
5984 break;
5985 }
5986 atomic_inc(&net->ipv6.dev_addr_genid);
5987 }
5988
5989 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5990 {
5991 rcu_read_lock_bh();
5992 if (likely(ifp->idev->dead == 0))
5993 __ipv6_ifa_notify(event, ifp);
5994 rcu_read_unlock_bh();
5995 }
5996
5997 #ifdef CONFIG_SYSCTL
5998
5999 static
6000 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6001 void __user *buffer, size_t *lenp, loff_t *ppos)
6002 {
6003 int *valp = ctl->data;
6004 int val = *valp;
6005 loff_t pos = *ppos;
6006 struct ctl_table lctl;
6007 int ret;
6008
6009 /*
6010 * ctl->data points to idev->cnf.forwarding, we should
6011 * not modify it until we get the rtnl lock.
6012 */
6013 lctl = *ctl;
6014 lctl.data = &val;
6015
6016 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6017
6018 if (write)
6019 ret = addrconf_fixup_forwarding(ctl, valp, val);
6020 if (ret)
6021 *ppos = pos;
6022 return ret;
6023 }
6024
6025 static
6026 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6027 void __user *buffer, size_t *lenp, loff_t *ppos)
6028 {
6029 struct inet6_dev *idev = ctl->extra1;
6030 int min_mtu = IPV6_MIN_MTU;
6031 struct ctl_table lctl;
6032
6033 lctl = *ctl;
6034 lctl.extra1 = &min_mtu;
6035 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6036
6037 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6038 }
6039
6040 static void dev_disable_change(struct inet6_dev *idev)
6041 {
6042 struct netdev_notifier_info info;
6043
6044 if (!idev || !idev->dev)
6045 return;
6046
6047 netdev_notifier_info_init(&info, idev->dev);
6048 if (idev->cnf.disable_ipv6)
6049 addrconf_notify(NULL, NETDEV_DOWN, &info);
6050 else
6051 addrconf_notify(NULL, NETDEV_UP, &info);
6052 }
6053
6054 static void addrconf_disable_change(struct net *net, __s32 newf)
6055 {
6056 struct net_device *dev;
6057 struct inet6_dev *idev;
6058
6059 for_each_netdev(net, dev) {
6060 idev = __in6_dev_get(dev);
6061 if (idev) {
6062 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6063 idev->cnf.disable_ipv6 = newf;
6064 if (changed)
6065 dev_disable_change(idev);
6066 }
6067 }
6068 }
6069
6070 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6071 {
6072 struct net *net;
6073 int old;
6074
6075 if (!rtnl_trylock())
6076 return restart_syscall();
6077
6078 net = (struct net *)table->extra2;
6079 old = *p;
6080 *p = newf;
6081
6082 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6083 rtnl_unlock();
6084 return 0;
6085 }
6086
6087 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6088 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6089 addrconf_disable_change(net, newf);
6090 } else if ((!newf) ^ (!old))
6091 dev_disable_change((struct inet6_dev *)table->extra1);
6092
6093 rtnl_unlock();
6094 return 0;
6095 }
6096
6097 static
6098 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6099 void __user *buffer, size_t *lenp, loff_t *ppos)
6100 {
6101 int *valp = ctl->data;
6102 int val = *valp;
6103 loff_t pos = *ppos;
6104 struct ctl_table lctl;
6105 int ret;
6106
6107 /*
6108 * ctl->data points to idev->cnf.disable_ipv6, we should
6109 * not modify it until we get the rtnl lock.
6110 */
6111 lctl = *ctl;
6112 lctl.data = &val;
6113
6114 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6115
6116 if (write)
6117 ret = addrconf_disable_ipv6(ctl, valp, val);
6118 if (ret)
6119 *ppos = pos;
6120 return ret;
6121 }
6122
6123 static
6124 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6125 void __user *buffer, size_t *lenp, loff_t *ppos)
6126 {
6127 int *valp = ctl->data;
6128 int ret;
6129 int old, new;
6130
6131 old = *valp;
6132 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6133 new = *valp;
6134
6135 if (write && old != new) {
6136 struct net *net = ctl->extra2;
6137
6138 if (!rtnl_trylock())
6139 return restart_syscall();
6140
6141 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6142 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6143 NETCONFA_PROXY_NEIGH,
6144 NETCONFA_IFINDEX_DEFAULT,
6145 net->ipv6.devconf_dflt);
6146 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6147 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6148 NETCONFA_PROXY_NEIGH,
6149 NETCONFA_IFINDEX_ALL,
6150 net->ipv6.devconf_all);
6151 else {
6152 struct inet6_dev *idev = ctl->extra1;
6153
6154 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6155 NETCONFA_PROXY_NEIGH,
6156 idev->dev->ifindex,
6157 &idev->cnf);
6158 }
6159 rtnl_unlock();
6160 }
6161
6162 return ret;
6163 }
6164
6165 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6166 void __user *buffer, size_t *lenp,
6167 loff_t *ppos)
6168 {
6169 int ret = 0;
6170 u32 new_val;
6171 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6172 struct net *net = (struct net *)ctl->extra2;
6173 struct ctl_table tmp = {
6174 .data = &new_val,
6175 .maxlen = sizeof(new_val),
6176 .mode = ctl->mode,
6177 };
6178
6179 if (!rtnl_trylock())
6180 return restart_syscall();
6181
6182 new_val = *((u32 *)ctl->data);
6183
6184 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6185 if (ret != 0)
6186 goto out;
6187
6188 if (write) {
6189 if (check_addr_gen_mode(new_val) < 0) {
6190 ret = -EINVAL;
6191 goto out;
6192 }
6193
6194 if (idev) {
6195 if (check_stable_privacy(idev, net, new_val) < 0) {
6196 ret = -EINVAL;
6197 goto out;
6198 }
6199
6200 if (idev->cnf.addr_gen_mode != new_val) {
6201 idev->cnf.addr_gen_mode = new_val;
6202 addrconf_dev_config(idev->dev);
6203 }
6204 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6205 struct net_device *dev;
6206
6207 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6208 for_each_netdev(net, dev) {
6209 idev = __in6_dev_get(dev);
6210 if (idev &&
6211 idev->cnf.addr_gen_mode != new_val) {
6212 idev->cnf.addr_gen_mode = new_val;
6213 addrconf_dev_config(idev->dev);
6214 }
6215 }
6216 }
6217
6218 *((u32 *)ctl->data) = new_val;
6219 }
6220
6221 out:
6222 rtnl_unlock();
6223
6224 return ret;
6225 }
6226
6227 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6228 void __user *buffer, size_t *lenp,
6229 loff_t *ppos)
6230 {
6231 int err;
6232 struct in6_addr addr;
6233 char str[IPV6_MAX_STRLEN];
6234 struct ctl_table lctl = *ctl;
6235 struct net *net = ctl->extra2;
6236 struct ipv6_stable_secret *secret = ctl->data;
6237
6238 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6239 return -EIO;
6240
6241 lctl.maxlen = IPV6_MAX_STRLEN;
6242 lctl.data = str;
6243
6244 if (!rtnl_trylock())
6245 return restart_syscall();
6246
6247 if (!write && !secret->initialized) {
6248 err = -EIO;
6249 goto out;
6250 }
6251
6252 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6253 if (err >= sizeof(str)) {
6254 err = -EIO;
6255 goto out;
6256 }
6257
6258 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6259 if (err || !write)
6260 goto out;
6261
6262 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6263 err = -EIO;
6264 goto out;
6265 }
6266
6267 secret->initialized = true;
6268 secret->secret = addr;
6269
6270 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6271 struct net_device *dev;
6272
6273 for_each_netdev(net, dev) {
6274 struct inet6_dev *idev = __in6_dev_get(dev);
6275
6276 if (idev) {
6277 idev->cnf.addr_gen_mode =
6278 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6279 }
6280 }
6281 } else {
6282 struct inet6_dev *idev = ctl->extra1;
6283
6284 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6285 }
6286
6287 out:
6288 rtnl_unlock();
6289
6290 return err;
6291 }
6292
6293 static
6294 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6295 int write,
6296 void __user *buffer,
6297 size_t *lenp,
6298 loff_t *ppos)
6299 {
6300 int *valp = ctl->data;
6301 int val = *valp;
6302 loff_t pos = *ppos;
6303 struct ctl_table lctl;
6304 int ret;
6305
6306 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6307 * we should not modify it until we get the rtnl lock.
6308 */
6309 lctl = *ctl;
6310 lctl.data = &val;
6311
6312 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6313
6314 if (write)
6315 ret = addrconf_fixup_linkdown(ctl, valp, val);
6316 if (ret)
6317 *ppos = pos;
6318 return ret;
6319 }
6320
6321 static
6322 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6323 {
6324 if (rt) {
6325 if (action)
6326 rt->dst.flags |= DST_NOPOLICY;
6327 else
6328 rt->dst.flags &= ~DST_NOPOLICY;
6329 }
6330 }
6331
6332 static
6333 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6334 {
6335 struct inet6_ifaddr *ifa;
6336
6337 read_lock_bh(&idev->lock);
6338 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6339 spin_lock(&ifa->lock);
6340 if (ifa->rt) {
6341 struct fib6_info *rt = ifa->rt;
6342 int cpu;
6343
6344 rcu_read_lock();
6345 ifa->rt->dst_nopolicy = val ? true : false;
6346 if (rt->rt6i_pcpu) {
6347 for_each_possible_cpu(cpu) {
6348 struct rt6_info **rtp;
6349
6350 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
6351 addrconf_set_nopolicy(*rtp, val);
6352 }
6353 }
6354 rcu_read_unlock();
6355 }
6356 spin_unlock(&ifa->lock);
6357 }
6358 read_unlock_bh(&idev->lock);
6359 }
6360
6361 static
6362 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6363 {
6364 struct inet6_dev *idev;
6365 struct net *net;
6366
6367 if (!rtnl_trylock())
6368 return restart_syscall();
6369
6370 *valp = val;
6371
6372 net = (struct net *)ctl->extra2;
6373 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6374 rtnl_unlock();
6375 return 0;
6376 }
6377
6378 if (valp == &net->ipv6.devconf_all->disable_policy) {
6379 struct net_device *dev;
6380
6381 for_each_netdev(net, dev) {
6382 idev = __in6_dev_get(dev);
6383 if (idev)
6384 addrconf_disable_policy_idev(idev, val);
6385 }
6386 } else {
6387 idev = (struct inet6_dev *)ctl->extra1;
6388 addrconf_disable_policy_idev(idev, val);
6389 }
6390
6391 rtnl_unlock();
6392 return 0;
6393 }
6394
6395 static
6396 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6397 void __user *buffer, size_t *lenp,
6398 loff_t *ppos)
6399 {
6400 int *valp = ctl->data;
6401 int val = *valp;
6402 loff_t pos = *ppos;
6403 struct ctl_table lctl;
6404 int ret;
6405
6406 lctl = *ctl;
6407 lctl.data = &val;
6408 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6409
6410 if (write && (*valp != val))
6411 ret = addrconf_disable_policy(ctl, valp, val);
6412
6413 if (ret)
6414 *ppos = pos;
6415
6416 return ret;
6417 }
6418
6419 static int minus_one = -1;
6420 static const int zero = 0;
6421 static const int one = 1;
6422 static const int two_five_five = 255;
6423
6424 static const struct ctl_table addrconf_sysctl[] = {
6425 {
6426 .procname = "forwarding",
6427 .data = &ipv6_devconf.forwarding,
6428 .maxlen = sizeof(int),
6429 .mode = 0644,
6430 .proc_handler = addrconf_sysctl_forward,
6431 },
6432 {
6433 .procname = "hop_limit",
6434 .data = &ipv6_devconf.hop_limit,
6435 .maxlen = sizeof(int),
6436 .mode = 0644,
6437 .proc_handler = proc_dointvec_minmax,
6438 .extra1 = (void *)&one,
6439 .extra2 = (void *)&two_five_five,
6440 },
6441 {
6442 .procname = "mtu",
6443 .data = &ipv6_devconf.mtu6,
6444 .maxlen = sizeof(int),
6445 .mode = 0644,
6446 .proc_handler = addrconf_sysctl_mtu,
6447 },
6448 {
6449 .procname = "accept_ra",
6450 .data = &ipv6_devconf.accept_ra,
6451 .maxlen = sizeof(int),
6452 .mode = 0644,
6453 .proc_handler = proc_dointvec,
6454 },
6455 {
6456 .procname = "accept_redirects",
6457 .data = &ipv6_devconf.accept_redirects,
6458 .maxlen = sizeof(int),
6459 .mode = 0644,
6460 .proc_handler = proc_dointvec,
6461 },
6462 {
6463 .procname = "autoconf",
6464 .data = &ipv6_devconf.autoconf,
6465 .maxlen = sizeof(int),
6466 .mode = 0644,
6467 .proc_handler = proc_dointvec,
6468 },
6469 {
6470 .procname = "dad_transmits",
6471 .data = &ipv6_devconf.dad_transmits,
6472 .maxlen = sizeof(int),
6473 .mode = 0644,
6474 .proc_handler = proc_dointvec,
6475 },
6476 {
6477 .procname = "router_solicitations",
6478 .data = &ipv6_devconf.rtr_solicits,
6479 .maxlen = sizeof(int),
6480 .mode = 0644,
6481 .proc_handler = proc_dointvec_minmax,
6482 .extra1 = &minus_one,
6483 },
6484 {
6485 .procname = "router_solicitation_interval",
6486 .data = &ipv6_devconf.rtr_solicit_interval,
6487 .maxlen = sizeof(int),
6488 .mode = 0644,
6489 .proc_handler = proc_dointvec_jiffies,
6490 },
6491 {
6492 .procname = "router_solicitation_max_interval",
6493 .data = &ipv6_devconf.rtr_solicit_max_interval,
6494 .maxlen = sizeof(int),
6495 .mode = 0644,
6496 .proc_handler = proc_dointvec_jiffies,
6497 },
6498 {
6499 .procname = "router_solicitation_delay",
6500 .data = &ipv6_devconf.rtr_solicit_delay,
6501 .maxlen = sizeof(int),
6502 .mode = 0644,
6503 .proc_handler = proc_dointvec_jiffies,
6504 },
6505 {
6506 .procname = "force_mld_version",
6507 .data = &ipv6_devconf.force_mld_version,
6508 .maxlen = sizeof(int),
6509 .mode = 0644,
6510 .proc_handler = proc_dointvec,
6511 },
6512 {
6513 .procname = "mldv1_unsolicited_report_interval",
6514 .data =
6515 &ipv6_devconf.mldv1_unsolicited_report_interval,
6516 .maxlen = sizeof(int),
6517 .mode = 0644,
6518 .proc_handler = proc_dointvec_ms_jiffies,
6519 },
6520 {
6521 .procname = "mldv2_unsolicited_report_interval",
6522 .data =
6523 &ipv6_devconf.mldv2_unsolicited_report_interval,
6524 .maxlen = sizeof(int),
6525 .mode = 0644,
6526 .proc_handler = proc_dointvec_ms_jiffies,
6527 },
6528 {
6529 .procname = "use_tempaddr",
6530 .data = &ipv6_devconf.use_tempaddr,
6531 .maxlen = sizeof(int),
6532 .mode = 0644,
6533 .proc_handler = proc_dointvec,
6534 },
6535 {
6536 .procname = "temp_valid_lft",
6537 .data = &ipv6_devconf.temp_valid_lft,
6538 .maxlen = sizeof(int),
6539 .mode = 0644,
6540 .proc_handler = proc_dointvec,
6541 },
6542 {
6543 .procname = "temp_prefered_lft",
6544 .data = &ipv6_devconf.temp_prefered_lft,
6545 .maxlen = sizeof(int),
6546 .mode = 0644,
6547 .proc_handler = proc_dointvec,
6548 },
6549 {
6550 .procname = "regen_max_retry",
6551 .data = &ipv6_devconf.regen_max_retry,
6552 .maxlen = sizeof(int),
6553 .mode = 0644,
6554 .proc_handler = proc_dointvec,
6555 },
6556 {
6557 .procname = "max_desync_factor",
6558 .data = &ipv6_devconf.max_desync_factor,
6559 .maxlen = sizeof(int),
6560 .mode = 0644,
6561 .proc_handler = proc_dointvec,
6562 },
6563 {
6564 .procname = "max_addresses",
6565 .data = &ipv6_devconf.max_addresses,
6566 .maxlen = sizeof(int),
6567 .mode = 0644,
6568 .proc_handler = proc_dointvec,
6569 },
6570 {
6571 .procname = "accept_ra_defrtr",
6572 .data = &ipv6_devconf.accept_ra_defrtr,
6573 .maxlen = sizeof(int),
6574 .mode = 0644,
6575 .proc_handler = proc_dointvec,
6576 },
6577 {
6578 .procname = "accept_ra_min_hop_limit",
6579 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6580 .maxlen = sizeof(int),
6581 .mode = 0644,
6582 .proc_handler = proc_dointvec,
6583 },
6584 {
6585 .procname = "accept_ra_pinfo",
6586 .data = &ipv6_devconf.accept_ra_pinfo,
6587 .maxlen = sizeof(int),
6588 .mode = 0644,
6589 .proc_handler = proc_dointvec,
6590 },
6591 #ifdef CONFIG_IPV6_ROUTER_PREF
6592 {
6593 .procname = "accept_ra_rtr_pref",
6594 .data = &ipv6_devconf.accept_ra_rtr_pref,
6595 .maxlen = sizeof(int),
6596 .mode = 0644,
6597 .proc_handler = proc_dointvec,
6598 },
6599 {
6600 .procname = "router_probe_interval",
6601 .data = &ipv6_devconf.rtr_probe_interval,
6602 .maxlen = sizeof(int),
6603 .mode = 0644,
6604 .proc_handler = proc_dointvec_jiffies,
6605 },
6606 #ifdef CONFIG_IPV6_ROUTE_INFO
6607 {
6608 .procname = "accept_ra_rt_info_min_plen",
6609 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6610 .maxlen = sizeof(int),
6611 .mode = 0644,
6612 .proc_handler = proc_dointvec,
6613 },
6614 {
6615 .procname = "accept_ra_rt_info_max_plen",
6616 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6617 .maxlen = sizeof(int),
6618 .mode = 0644,
6619 .proc_handler = proc_dointvec,
6620 },
6621 #endif
6622 #endif
6623 {
6624 .procname = "proxy_ndp",
6625 .data = &ipv6_devconf.proxy_ndp,
6626 .maxlen = sizeof(int),
6627 .mode = 0644,
6628 .proc_handler = addrconf_sysctl_proxy_ndp,
6629 },
6630 {
6631 .procname = "accept_source_route",
6632 .data = &ipv6_devconf.accept_source_route,
6633 .maxlen = sizeof(int),
6634 .mode = 0644,
6635 .proc_handler = proc_dointvec,
6636 },
6637 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6638 {
6639 .procname = "optimistic_dad",
6640 .data = &ipv6_devconf.optimistic_dad,
6641 .maxlen = sizeof(int),
6642 .mode = 0644,
6643 .proc_handler = proc_dointvec,
6644 },
6645 {
6646 .procname = "use_optimistic",
6647 .data = &ipv6_devconf.use_optimistic,
6648 .maxlen = sizeof(int),
6649 .mode = 0644,
6650 .proc_handler = proc_dointvec,
6651 },
6652 #endif
6653 #ifdef CONFIG_IPV6_MROUTE
6654 {
6655 .procname = "mc_forwarding",
6656 .data = &ipv6_devconf.mc_forwarding,
6657 .maxlen = sizeof(int),
6658 .mode = 0444,
6659 .proc_handler = proc_dointvec,
6660 },
6661 #endif
6662 {
6663 .procname = "disable_ipv6",
6664 .data = &ipv6_devconf.disable_ipv6,
6665 .maxlen = sizeof(int),
6666 .mode = 0644,
6667 .proc_handler = addrconf_sysctl_disable,
6668 },
6669 {
6670 .procname = "accept_dad",
6671 .data = &ipv6_devconf.accept_dad,
6672 .maxlen = sizeof(int),
6673 .mode = 0644,
6674 .proc_handler = proc_dointvec,
6675 },
6676 {
6677 .procname = "force_tllao",
6678 .data = &ipv6_devconf.force_tllao,
6679 .maxlen = sizeof(int),
6680 .mode = 0644,
6681 .proc_handler = proc_dointvec
6682 },
6683 {
6684 .procname = "ndisc_notify",
6685 .data = &ipv6_devconf.ndisc_notify,
6686 .maxlen = sizeof(int),
6687 .mode = 0644,
6688 .proc_handler = proc_dointvec
6689 },
6690 {
6691 .procname = "suppress_frag_ndisc",
6692 .data = &ipv6_devconf.suppress_frag_ndisc,
6693 .maxlen = sizeof(int),
6694 .mode = 0644,
6695 .proc_handler = proc_dointvec
6696 },
6697 {
6698 .procname = "accept_ra_from_local",
6699 .data = &ipv6_devconf.accept_ra_from_local,
6700 .maxlen = sizeof(int),
6701 .mode = 0644,
6702 .proc_handler = proc_dointvec,
6703 },
6704 {
6705 .procname = "accept_ra_mtu",
6706 .data = &ipv6_devconf.accept_ra_mtu,
6707 .maxlen = sizeof(int),
6708 .mode = 0644,
6709 .proc_handler = proc_dointvec,
6710 },
6711 {
6712 .procname = "stable_secret",
6713 .data = &ipv6_devconf.stable_secret,
6714 .maxlen = IPV6_MAX_STRLEN,
6715 .mode = 0600,
6716 .proc_handler = addrconf_sysctl_stable_secret,
6717 },
6718 {
6719 .procname = "use_oif_addrs_only",
6720 .data = &ipv6_devconf.use_oif_addrs_only,
6721 .maxlen = sizeof(int),
6722 .mode = 0644,
6723 .proc_handler = proc_dointvec,
6724 },
6725 {
6726 .procname = "ignore_routes_with_linkdown",
6727 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6728 .maxlen = sizeof(int),
6729 .mode = 0644,
6730 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6731 },
6732 {
6733 .procname = "drop_unicast_in_l2_multicast",
6734 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6735 .maxlen = sizeof(int),
6736 .mode = 0644,
6737 .proc_handler = proc_dointvec,
6738 },
6739 {
6740 .procname = "drop_unsolicited_na",
6741 .data = &ipv6_devconf.drop_unsolicited_na,
6742 .maxlen = sizeof(int),
6743 .mode = 0644,
6744 .proc_handler = proc_dointvec,
6745 },
6746 {
6747 .procname = "keep_addr_on_down",
6748 .data = &ipv6_devconf.keep_addr_on_down,
6749 .maxlen = sizeof(int),
6750 .mode = 0644,
6751 .proc_handler = proc_dointvec,
6752
6753 },
6754 {
6755 .procname = "seg6_enabled",
6756 .data = &ipv6_devconf.seg6_enabled,
6757 .maxlen = sizeof(int),
6758 .mode = 0644,
6759 .proc_handler = proc_dointvec,
6760 },
6761 #ifdef CONFIG_IPV6_SEG6_HMAC
6762 {
6763 .procname = "seg6_require_hmac",
6764 .data = &ipv6_devconf.seg6_require_hmac,
6765 .maxlen = sizeof(int),
6766 .mode = 0644,
6767 .proc_handler = proc_dointvec,
6768 },
6769 #endif
6770 {
6771 .procname = "enhanced_dad",
6772 .data = &ipv6_devconf.enhanced_dad,
6773 .maxlen = sizeof(int),
6774 .mode = 0644,
6775 .proc_handler = proc_dointvec,
6776 },
6777 {
6778 .procname = "addr_gen_mode",
6779 .data = &ipv6_devconf.addr_gen_mode,
6780 .maxlen = sizeof(int),
6781 .mode = 0644,
6782 .proc_handler = addrconf_sysctl_addr_gen_mode,
6783 },
6784 {
6785 .procname = "disable_policy",
6786 .data = &ipv6_devconf.disable_policy,
6787 .maxlen = sizeof(int),
6788 .mode = 0644,
6789 .proc_handler = addrconf_sysctl_disable_policy,
6790 },
6791 {
6792 .procname = "ndisc_tclass",
6793 .data = &ipv6_devconf.ndisc_tclass,
6794 .maxlen = sizeof(int),
6795 .mode = 0644,
6796 .proc_handler = proc_dointvec_minmax,
6797 .extra1 = (void *)&zero,
6798 .extra2 = (void *)&two_five_five,
6799 },
6800 {
6801 /* sentinel */
6802 }
6803 };
6804
6805 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6806 struct inet6_dev *idev, struct ipv6_devconf *p)
6807 {
6808 int i, ifindex;
6809 struct ctl_table *table;
6810 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6811
6812 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6813 if (!table)
6814 goto out;
6815
6816 for (i = 0; table[i].data; i++) {
6817 table[i].data += (char *)p - (char *)&ipv6_devconf;
6818 /* If one of these is already set, then it is not safe to
6819 * overwrite either of them: this makes proc_dointvec_minmax
6820 * usable.
6821 */
6822 if (!table[i].extra1 && !table[i].extra2) {
6823 table[i].extra1 = idev; /* embedded; no ref */
6824 table[i].extra2 = net;
6825 }
6826 }
6827
6828 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6829
6830 p->sysctl_header = register_net_sysctl(net, path, table);
6831 if (!p->sysctl_header)
6832 goto free;
6833
6834 if (!strcmp(dev_name, "all"))
6835 ifindex = NETCONFA_IFINDEX_ALL;
6836 else if (!strcmp(dev_name, "default"))
6837 ifindex = NETCONFA_IFINDEX_DEFAULT;
6838 else
6839 ifindex = idev->dev->ifindex;
6840 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6841 ifindex, p);
6842 return 0;
6843
6844 free:
6845 kfree(table);
6846 out:
6847 return -ENOBUFS;
6848 }
6849
6850 static void __addrconf_sysctl_unregister(struct net *net,
6851 struct ipv6_devconf *p, int ifindex)
6852 {
6853 struct ctl_table *table;
6854
6855 if (!p->sysctl_header)
6856 return;
6857
6858 table = p->sysctl_header->ctl_table_arg;
6859 unregister_net_sysctl_table(p->sysctl_header);
6860 p->sysctl_header = NULL;
6861 kfree(table);
6862
6863 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6864 }
6865
6866 static int addrconf_sysctl_register(struct inet6_dev *idev)
6867 {
6868 int err;
6869
6870 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6871 return -EINVAL;
6872
6873 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6874 &ndisc_ifinfo_sysctl_change);
6875 if (err)
6876 return err;
6877 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6878 idev, &idev->cnf);
6879 if (err)
6880 neigh_sysctl_unregister(idev->nd_parms);
6881
6882 return err;
6883 }
6884
6885 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6886 {
6887 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6888 idev->dev->ifindex);
6889 neigh_sysctl_unregister(idev->nd_parms);
6890 }
6891
6892
6893 #endif
6894
6895 static int __net_init addrconf_init_net(struct net *net)
6896 {
6897 int err = -ENOMEM;
6898 struct ipv6_devconf *all, *dflt;
6899
6900 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6901 if (!all)
6902 goto err_alloc_all;
6903
6904 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6905 if (!dflt)
6906 goto err_alloc_dflt;
6907
6908 if (IS_ENABLED(CONFIG_SYSCTL) &&
6909 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) {
6910 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf));
6911 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt));
6912 }
6913
6914 /* these will be inherited by all namespaces */
6915 dflt->autoconf = ipv6_defaults.autoconf;
6916 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6917
6918 dflt->stable_secret.initialized = false;
6919 all->stable_secret.initialized = false;
6920
6921 net->ipv6.devconf_all = all;
6922 net->ipv6.devconf_dflt = dflt;
6923
6924 #ifdef CONFIG_SYSCTL
6925 err = __addrconf_sysctl_register(net, "all", NULL, all);
6926 if (err < 0)
6927 goto err_reg_all;
6928
6929 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6930 if (err < 0)
6931 goto err_reg_dflt;
6932 #endif
6933 return 0;
6934
6935 #ifdef CONFIG_SYSCTL
6936 err_reg_dflt:
6937 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6938 err_reg_all:
6939 kfree(dflt);
6940 #endif
6941 err_alloc_dflt:
6942 kfree(all);
6943 err_alloc_all:
6944 return err;
6945 }
6946
6947 static void __net_exit addrconf_exit_net(struct net *net)
6948 {
6949 #ifdef CONFIG_SYSCTL
6950 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6951 NETCONFA_IFINDEX_DEFAULT);
6952 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6953 NETCONFA_IFINDEX_ALL);
6954 #endif
6955 kfree(net->ipv6.devconf_dflt);
6956 kfree(net->ipv6.devconf_all);
6957 }
6958
6959 static struct pernet_operations addrconf_ops = {
6960 .init = addrconf_init_net,
6961 .exit = addrconf_exit_net,
6962 };
6963
6964 static struct rtnl_af_ops inet6_ops __read_mostly = {
6965 .family = AF_INET6,
6966 .fill_link_af = inet6_fill_link_af,
6967 .get_link_af_size = inet6_get_link_af_size,
6968 .validate_link_af = inet6_validate_link_af,
6969 .set_link_af = inet6_set_link_af,
6970 };
6971
6972 /*
6973 * Init / cleanup code
6974 */
6975
6976 int __init addrconf_init(void)
6977 {
6978 struct inet6_dev *idev;
6979 int i, err;
6980
6981 err = ipv6_addr_label_init();
6982 if (err < 0) {
6983 pr_crit("%s: cannot initialize default policy table: %d\n",
6984 __func__, err);
6985 goto out;
6986 }
6987
6988 err = register_pernet_subsys(&addrconf_ops);
6989 if (err < 0)
6990 goto out_addrlabel;
6991
6992 addrconf_wq = create_workqueue("ipv6_addrconf");
6993 if (!addrconf_wq) {
6994 err = -ENOMEM;
6995 goto out_nowq;
6996 }
6997
6998 /* The addrconf netdev notifier requires that loopback_dev
6999 * has it's ipv6 private information allocated and setup
7000 * before it can bring up and give link-local addresses
7001 * to other devices which are up.
7002 *
7003 * Unfortunately, loopback_dev is not necessarily the first
7004 * entry in the global dev_base list of net devices. In fact,
7005 * it is likely to be the very last entry on that list.
7006 * So this causes the notifier registry below to try and
7007 * give link-local addresses to all devices besides loopback_dev
7008 * first, then loopback_dev, which cases all the non-loopback_dev
7009 * devices to fail to get a link-local address.
7010 *
7011 * So, as a temporary fix, allocate the ipv6 structure for
7012 * loopback_dev first by hand.
7013 * Longer term, all of the dependencies ipv6 has upon the loopback
7014 * device and it being up should be removed.
7015 */
7016 rtnl_lock();
7017 idev = ipv6_add_dev(init_net.loopback_dev);
7018 rtnl_unlock();
7019 if (IS_ERR(idev)) {
7020 err = PTR_ERR(idev);
7021 goto errlo;
7022 }
7023
7024 ip6_route_init_special_entries();
7025
7026 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7027 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7028
7029 register_netdevice_notifier(&ipv6_dev_notf);
7030
7031 addrconf_verify();
7032
7033 rtnl_af_register(&inet6_ops);
7034
7035 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7036 NULL, inet6_dump_ifinfo, 0);
7037 if (err < 0)
7038 goto errout;
7039
7040 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7041 inet6_rtm_newaddr, NULL, 0);
7042 if (err < 0)
7043 goto errout;
7044 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7045 inet6_rtm_deladdr, NULL, 0);
7046 if (err < 0)
7047 goto errout;
7048 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7049 inet6_rtm_getaddr, inet6_dump_ifaddr,
7050 RTNL_FLAG_DOIT_UNLOCKED);
7051 if (err < 0)
7052 goto errout;
7053 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7054 NULL, inet6_dump_ifmcaddr, 0);
7055 if (err < 0)
7056 goto errout;
7057 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7058 NULL, inet6_dump_ifacaddr, 0);
7059 if (err < 0)
7060 goto errout;
7061 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7062 inet6_netconf_get_devconf,
7063 inet6_netconf_dump_devconf,
7064 RTNL_FLAG_DOIT_UNLOCKED);
7065 if (err < 0)
7066 goto errout;
7067 err = ipv6_addr_label_rtnl_register();
7068 if (err < 0)
7069 goto errout;
7070
7071 return 0;
7072 errout:
7073 rtnl_unregister_all(PF_INET6);
7074 rtnl_af_unregister(&inet6_ops);
7075 unregister_netdevice_notifier(&ipv6_dev_notf);
7076 errlo:
7077 destroy_workqueue(addrconf_wq);
7078 out_nowq:
7079 unregister_pernet_subsys(&addrconf_ops);
7080 out_addrlabel:
7081 ipv6_addr_label_cleanup();
7082 out:
7083 return err;
7084 }
7085
7086 void addrconf_cleanup(void)
7087 {
7088 struct net_device *dev;
7089 int i;
7090
7091 unregister_netdevice_notifier(&ipv6_dev_notf);
7092 unregister_pernet_subsys(&addrconf_ops);
7093 ipv6_addr_label_cleanup();
7094
7095 rtnl_af_unregister(&inet6_ops);
7096
7097 rtnl_lock();
7098
7099 /* clean dev list */
7100 for_each_netdev(&init_net, dev) {
7101 if (__in6_dev_get(dev) == NULL)
7102 continue;
7103 addrconf_ifdown(dev, 1);
7104 }
7105 addrconf_ifdown(init_net.loopback_dev, 2);
7106
7107 /*
7108 * Check hash table.
7109 */
7110 spin_lock_bh(&addrconf_hash_lock);
7111 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7112 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7113 spin_unlock_bh(&addrconf_hash_lock);
7114 cancel_delayed_work(&addr_chk_work);
7115 rtnl_unlock();
7116
7117 destroy_workqueue(addrconf_wq);
7118 }
Linux with added FPC-III support