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ipv6: introduce neighbour discovery ops
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_addr.h>
53 #include <linux/if_arp.h>
54 #include <linux/if_arcnet.h>
55 #include <linux/if_infiniband.h>
56 #include <linux/route.h>
57 #include <linux/inetdevice.h>
58 #include <linux/init.h>
59 #include <linux/slab.h>
60 #ifdef CONFIG_SYSCTL
61 #include <linux/sysctl.h>
62 #endif
63 #include <linux/capability.h>
64 #include <linux/delay.h>
65 #include <linux/notifier.h>
66 #include <linux/string.h>
67 #include <linux/hash.h>
68
69 #include <net/net_namespace.h>
70 #include <net/sock.h>
71 #include <net/snmp.h>
72
73 #include <net/6lowpan.h>
74 #include <net/firewire.h>
75 #include <net/ipv6.h>
76 #include <net/protocol.h>
77 #include <net/ndisc.h>
78 #include <net/ip6_route.h>
79 #include <net/addrconf.h>
80 #include <net/tcp.h>
81 #include <net/ip.h>
82 #include <net/netlink.h>
83 #include <net/pkt_sched.h>
84 #include <net/l3mdev.h>
85 #include <linux/if_tunnel.h>
86 #include <linux/rtnetlink.h>
87 #include <linux/netconf.h>
88 #include <linux/random.h>
89 #include <linux/uaccess.h>
90 #include <asm/unaligned.h>
91
92 #include <linux/proc_fs.h>
93 #include <linux/seq_file.h>
94 #include <linux/export.h>
95
96 /* Set to 3 to get tracing... */
97 #define ACONF_DEBUG 2
98
99 #if ACONF_DEBUG >= 3
100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
101 #else
102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
103 #endif
104
105 #define INFINITY_LIFE_TIME 0xFFFFFFFF
106
107 #define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
110 static inline u32 cstamp_delta(unsigned long cstamp)
111 {
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113 }
114
115 #ifdef CONFIG_SYSCTL
116 static int addrconf_sysctl_register(struct inet6_dev *idev);
117 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118 #else
119 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
120 {
121 return 0;
122 }
123
124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125 {
126 }
127 #endif
128
129 static void __ipv6_regen_rndid(struct inet6_dev *idev);
130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
131 static void ipv6_regen_rndid(unsigned long data);
132
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
135 static int ipv6_generate_stable_address(struct in6_addr *addr,
136 u8 dad_count,
137 const struct inet6_dev *idev);
138
139 /*
140 * Configured unicast address hash table
141 */
142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
143 static DEFINE_SPINLOCK(addrconf_hash_lock);
144
145 static void addrconf_verify(void);
146 static void addrconf_verify_rtnl(void);
147 static void addrconf_verify_work(struct work_struct *);
148
149 static struct workqueue_struct *addrconf_wq;
150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
151
152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154
155 static void addrconf_type_change(struct net_device *dev,
156 unsigned long event);
157 static int addrconf_ifdown(struct net_device *dev, int how);
158
159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160 int plen,
161 const struct net_device *dev,
162 u32 flags, u32 noflags);
163
164 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
165 static void addrconf_dad_work(struct work_struct *w);
166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
167 static void addrconf_dad_run(struct inet6_dev *idev);
168 static void addrconf_rs_timer(unsigned long data);
169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171
172 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
173 struct prefix_info *pinfo);
174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175 struct net_device *dev);
176
177 static struct ipv6_devconf ipv6_devconf __read_mostly = {
178 .forwarding = 0,
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
181 .accept_ra = 1,
182 .accept_redirects = 1,
183 .autoconf = 1,
184 .force_mld_version = 0,
185 .mldv1_unsolicited_report_interval = 10 * HZ,
186 .mldv2_unsolicited_report_interval = HZ,
187 .dad_transmits = 1,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
191 .use_tempaddr = 0,
192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
196 .max_addresses = IPV6_MAX_ADDRESSES,
197 .accept_ra_defrtr = 1,
198 .accept_ra_from_local = 0,
199 .accept_ra_min_hop_limit= 1,
200 .accept_ra_pinfo = 1,
201 #ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
203 .rtr_probe_interval = 60 * HZ,
204 #ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
206 #endif
207 #endif
208 .proxy_ndp = 0,
209 .accept_source_route = 0, /* we do not accept RH0 by default. */
210 .disable_ipv6 = 0,
211 .accept_dad = 1,
212 .suppress_frag_ndisc = 1,
213 .accept_ra_mtu = 1,
214 .stable_secret = {
215 .initialized = false,
216 },
217 .use_oif_addrs_only = 0,
218 .ignore_routes_with_linkdown = 0,
219 .keep_addr_on_down = 0,
220 };
221
222 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
223 .forwarding = 0,
224 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
225 .mtu6 = IPV6_MIN_MTU,
226 .accept_ra = 1,
227 .accept_redirects = 1,
228 .autoconf = 1,
229 .force_mld_version = 0,
230 .mldv1_unsolicited_report_interval = 10 * HZ,
231 .mldv2_unsolicited_report_interval = HZ,
232 .dad_transmits = 1,
233 .rtr_solicits = MAX_RTR_SOLICITATIONS,
234 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
235 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
236 .use_tempaddr = 0,
237 .temp_valid_lft = TEMP_VALID_LIFETIME,
238 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
239 .regen_max_retry = REGEN_MAX_RETRY,
240 .max_desync_factor = MAX_DESYNC_FACTOR,
241 .max_addresses = IPV6_MAX_ADDRESSES,
242 .accept_ra_defrtr = 1,
243 .accept_ra_from_local = 0,
244 .accept_ra_min_hop_limit= 1,
245 .accept_ra_pinfo = 1,
246 #ifdef CONFIG_IPV6_ROUTER_PREF
247 .accept_ra_rtr_pref = 1,
248 .rtr_probe_interval = 60 * HZ,
249 #ifdef CONFIG_IPV6_ROUTE_INFO
250 .accept_ra_rt_info_max_plen = 0,
251 #endif
252 #endif
253 .proxy_ndp = 0,
254 .accept_source_route = 0, /* we do not accept RH0 by default. */
255 .disable_ipv6 = 0,
256 .accept_dad = 1,
257 .suppress_frag_ndisc = 1,
258 .accept_ra_mtu = 1,
259 .stable_secret = {
260 .initialized = false,
261 },
262 .use_oif_addrs_only = 0,
263 .ignore_routes_with_linkdown = 0,
264 .keep_addr_on_down = 0,
265 };
266
267 /* Check if a valid qdisc is available */
268 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
269 {
270 return !qdisc_tx_is_noop(dev);
271 }
272
273 static void addrconf_del_rs_timer(struct inet6_dev *idev)
274 {
275 if (del_timer(&idev->rs_timer))
276 __in6_dev_put(idev);
277 }
278
279 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
280 {
281 if (cancel_delayed_work(&ifp->dad_work))
282 __in6_ifa_put(ifp);
283 }
284
285 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
286 unsigned long when)
287 {
288 if (!timer_pending(&idev->rs_timer))
289 in6_dev_hold(idev);
290 mod_timer(&idev->rs_timer, jiffies + when);
291 }
292
293 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
294 unsigned long delay)
295 {
296 if (!delayed_work_pending(&ifp->dad_work))
297 in6_ifa_hold(ifp);
298 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
299 }
300
301 static int snmp6_alloc_dev(struct inet6_dev *idev)
302 {
303 int i;
304
305 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
306 if (!idev->stats.ipv6)
307 goto err_ip;
308
309 for_each_possible_cpu(i) {
310 struct ipstats_mib *addrconf_stats;
311 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
312 u64_stats_init(&addrconf_stats->syncp);
313 }
314
315
316 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
317 GFP_KERNEL);
318 if (!idev->stats.icmpv6dev)
319 goto err_icmp;
320 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
321 GFP_KERNEL);
322 if (!idev->stats.icmpv6msgdev)
323 goto err_icmpmsg;
324
325 return 0;
326
327 err_icmpmsg:
328 kfree(idev->stats.icmpv6dev);
329 err_icmp:
330 free_percpu(idev->stats.ipv6);
331 err_ip:
332 return -ENOMEM;
333 }
334
335 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
336 {
337 struct inet6_dev *ndev;
338 int err = -ENOMEM;
339
340 ASSERT_RTNL();
341
342 if (dev->mtu < IPV6_MIN_MTU)
343 return ERR_PTR(-EINVAL);
344
345 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
346 if (!ndev)
347 return ERR_PTR(err);
348
349 rwlock_init(&ndev->lock);
350 ndev->dev = dev;
351 INIT_LIST_HEAD(&ndev->addr_list);
352 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
353 (unsigned long)ndev);
354 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
355
356 if (ndev->cnf.stable_secret.initialized)
357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
358 else
359 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
360
361 ndev->cnf.mtu6 = dev->mtu;
362 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
363 if (!ndev->nd_parms) {
364 kfree(ndev);
365 return ERR_PTR(err);
366 }
367 if (ndev->cnf.forwarding)
368 dev_disable_lro(dev);
369 /* We refer to the device */
370 dev_hold(dev);
371
372 if (snmp6_alloc_dev(ndev) < 0) {
373 ADBG(KERN_WARNING
374 "%s: cannot allocate memory for statistics; dev=%s.\n",
375 __func__, dev->name);
376 neigh_parms_release(&nd_tbl, ndev->nd_parms);
377 dev_put(dev);
378 kfree(ndev);
379 return ERR_PTR(err);
380 }
381
382 if (snmp6_register_dev(ndev) < 0) {
383 ADBG(KERN_WARNING
384 "%s: cannot create /proc/net/dev_snmp6/%s\n",
385 __func__, dev->name);
386 goto err_release;
387 }
388
389 /* One reference from device. We must do this before
390 * we invoke __ipv6_regen_rndid().
391 */
392 in6_dev_hold(ndev);
393
394 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
395 ndev->cnf.accept_dad = -1;
396
397 #if IS_ENABLED(CONFIG_IPV6_SIT)
398 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
399 pr_info("%s: Disabled Multicast RS\n", dev->name);
400 ndev->cnf.rtr_solicits = 0;
401 }
402 #endif
403
404 INIT_LIST_HEAD(&ndev->tempaddr_list);
405 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
406 if ((dev->flags&IFF_LOOPBACK) ||
407 dev->type == ARPHRD_TUNNEL ||
408 dev->type == ARPHRD_TUNNEL6 ||
409 dev->type == ARPHRD_SIT ||
410 dev->type == ARPHRD_NONE) {
411 ndev->cnf.use_tempaddr = -1;
412 } else {
413 in6_dev_hold(ndev);
414 ipv6_regen_rndid((unsigned long) ndev);
415 }
416
417 ndev->token = in6addr_any;
418
419 if (netif_running(dev) && addrconf_qdisc_ok(dev))
420 ndev->if_flags |= IF_READY;
421
422 ipv6_mc_init_dev(ndev);
423 ndev->tstamp = jiffies;
424 err = addrconf_sysctl_register(ndev);
425 if (err) {
426 ipv6_mc_destroy_dev(ndev);
427 del_timer(&ndev->regen_timer);
428 snmp6_unregister_dev(ndev);
429 goto err_release;
430 }
431 /* protected by rtnl_lock */
432 rcu_assign_pointer(dev->ip6_ptr, ndev);
433
434 /* Join interface-local all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
436
437 /* Join all-node multicast group */
438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
439
440 /* Join all-router multicast group if forwarding is set */
441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
443
444 return ndev;
445
446 err_release:
447 neigh_parms_release(&nd_tbl, ndev->nd_parms);
448 ndev->dead = 1;
449 in6_dev_finish_destroy(ndev);
450 return ERR_PTR(err);
451 }
452
453 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
454 {
455 struct inet6_dev *idev;
456
457 ASSERT_RTNL();
458
459 idev = __in6_dev_get(dev);
460 if (!idev) {
461 idev = ipv6_add_dev(dev);
462 if (IS_ERR(idev))
463 return NULL;
464 }
465
466 if (dev->flags&IFF_UP)
467 ipv6_mc_up(idev);
468 return idev;
469 }
470
471 static int inet6_netconf_msgsize_devconf(int type)
472 {
473 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
474 + nla_total_size(4); /* NETCONFA_IFINDEX */
475 bool all = false;
476
477 if (type == NETCONFA_ALL)
478 all = true;
479
480 if (all || type == NETCONFA_FORWARDING)
481 size += nla_total_size(4);
482 #ifdef CONFIG_IPV6_MROUTE
483 if (all || type == NETCONFA_MC_FORWARDING)
484 size += nla_total_size(4);
485 #endif
486 if (all || type == NETCONFA_PROXY_NEIGH)
487 size += nla_total_size(4);
488
489 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
490 size += nla_total_size(4);
491
492 return size;
493 }
494
495 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
496 struct ipv6_devconf *devconf, u32 portid,
497 u32 seq, int event, unsigned int flags,
498 int type)
499 {
500 struct nlmsghdr *nlh;
501 struct netconfmsg *ncm;
502 bool all = false;
503
504 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
505 flags);
506 if (!nlh)
507 return -EMSGSIZE;
508
509 if (type == NETCONFA_ALL)
510 all = true;
511
512 ncm = nlmsg_data(nlh);
513 ncm->ncm_family = AF_INET6;
514
515 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
516 goto nla_put_failure;
517
518 if ((all || type == NETCONFA_FORWARDING) &&
519 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
520 goto nla_put_failure;
521 #ifdef CONFIG_IPV6_MROUTE
522 if ((all || type == NETCONFA_MC_FORWARDING) &&
523 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
524 devconf->mc_forwarding) < 0)
525 goto nla_put_failure;
526 #endif
527 if ((all || type == NETCONFA_PROXY_NEIGH) &&
528 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
529 goto nla_put_failure;
530
531 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
532 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
533 devconf->ignore_routes_with_linkdown) < 0)
534 goto nla_put_failure;
535
536 nlmsg_end(skb, nlh);
537 return 0;
538
539 nla_put_failure:
540 nlmsg_cancel(skb, nlh);
541 return -EMSGSIZE;
542 }
543
544 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
545 struct ipv6_devconf *devconf)
546 {
547 struct sk_buff *skb;
548 int err = -ENOBUFS;
549
550 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
551 if (!skb)
552 goto errout;
553
554 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
555 RTM_NEWNETCONF, 0, type);
556 if (err < 0) {
557 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
558 WARN_ON(err == -EMSGSIZE);
559 kfree_skb(skb);
560 goto errout;
561 }
562 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
563 return;
564 errout:
565 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
566 }
567
568 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
569 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
570 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
571 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
572 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
573 };
574
575 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
576 struct nlmsghdr *nlh)
577 {
578 struct net *net = sock_net(in_skb->sk);
579 struct nlattr *tb[NETCONFA_MAX+1];
580 struct netconfmsg *ncm;
581 struct sk_buff *skb;
582 struct ipv6_devconf *devconf;
583 struct inet6_dev *in6_dev;
584 struct net_device *dev;
585 int ifindex;
586 int err;
587
588 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
589 devconf_ipv6_policy);
590 if (err < 0)
591 goto errout;
592
593 err = -EINVAL;
594 if (!tb[NETCONFA_IFINDEX])
595 goto errout;
596
597 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
598 switch (ifindex) {
599 case NETCONFA_IFINDEX_ALL:
600 devconf = net->ipv6.devconf_all;
601 break;
602 case NETCONFA_IFINDEX_DEFAULT:
603 devconf = net->ipv6.devconf_dflt;
604 break;
605 default:
606 dev = __dev_get_by_index(net, ifindex);
607 if (!dev)
608 goto errout;
609 in6_dev = __in6_dev_get(dev);
610 if (!in6_dev)
611 goto errout;
612 devconf = &in6_dev->cnf;
613 break;
614 }
615
616 err = -ENOBUFS;
617 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
618 if (!skb)
619 goto errout;
620
621 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
622 NETLINK_CB(in_skb).portid,
623 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
624 NETCONFA_ALL);
625 if (err < 0) {
626 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
627 WARN_ON(err == -EMSGSIZE);
628 kfree_skb(skb);
629 goto errout;
630 }
631 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
632 errout:
633 return err;
634 }
635
636 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
637 struct netlink_callback *cb)
638 {
639 struct net *net = sock_net(skb->sk);
640 int h, s_h;
641 int idx, s_idx;
642 struct net_device *dev;
643 struct inet6_dev *idev;
644 struct hlist_head *head;
645
646 s_h = cb->args[0];
647 s_idx = idx = cb->args[1];
648
649 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
650 idx = 0;
651 head = &net->dev_index_head[h];
652 rcu_read_lock();
653 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
654 net->dev_base_seq;
655 hlist_for_each_entry_rcu(dev, head, index_hlist) {
656 if (idx < s_idx)
657 goto cont;
658 idev = __in6_dev_get(dev);
659 if (!idev)
660 goto cont;
661
662 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
663 &idev->cnf,
664 NETLINK_CB(cb->skb).portid,
665 cb->nlh->nlmsg_seq,
666 RTM_NEWNETCONF,
667 NLM_F_MULTI,
668 NETCONFA_ALL) < 0) {
669 rcu_read_unlock();
670 goto done;
671 }
672 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
673 cont:
674 idx++;
675 }
676 rcu_read_unlock();
677 }
678 if (h == NETDEV_HASHENTRIES) {
679 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
680 net->ipv6.devconf_all,
681 NETLINK_CB(cb->skb).portid,
682 cb->nlh->nlmsg_seq,
683 RTM_NEWNETCONF, NLM_F_MULTI,
684 NETCONFA_ALL) < 0)
685 goto done;
686 else
687 h++;
688 }
689 if (h == NETDEV_HASHENTRIES + 1) {
690 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
691 net->ipv6.devconf_dflt,
692 NETLINK_CB(cb->skb).portid,
693 cb->nlh->nlmsg_seq,
694 RTM_NEWNETCONF, NLM_F_MULTI,
695 NETCONFA_ALL) < 0)
696 goto done;
697 else
698 h++;
699 }
700 done:
701 cb->args[0] = h;
702 cb->args[1] = idx;
703
704 return skb->len;
705 }
706
707 #ifdef CONFIG_SYSCTL
708 static void dev_forward_change(struct inet6_dev *idev)
709 {
710 struct net_device *dev;
711 struct inet6_ifaddr *ifa;
712
713 if (!idev)
714 return;
715 dev = idev->dev;
716 if (idev->cnf.forwarding)
717 dev_disable_lro(dev);
718 if (dev->flags & IFF_MULTICAST) {
719 if (idev->cnf.forwarding) {
720 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
721 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
722 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
723 } else {
724 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
725 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
726 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
727 }
728 }
729
730 list_for_each_entry(ifa, &idev->addr_list, if_list) {
731 if (ifa->flags&IFA_F_TENTATIVE)
732 continue;
733 if (idev->cnf.forwarding)
734 addrconf_join_anycast(ifa);
735 else
736 addrconf_leave_anycast(ifa);
737 }
738 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
739 dev->ifindex, &idev->cnf);
740 }
741
742
743 static void addrconf_forward_change(struct net *net, __s32 newf)
744 {
745 struct net_device *dev;
746 struct inet6_dev *idev;
747
748 for_each_netdev(net, dev) {
749 idev = __in6_dev_get(dev);
750 if (idev) {
751 int changed = (!idev->cnf.forwarding) ^ (!newf);
752 idev->cnf.forwarding = newf;
753 if (changed)
754 dev_forward_change(idev);
755 }
756 }
757 }
758
759 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
760 {
761 struct net *net;
762 int old;
763
764 if (!rtnl_trylock())
765 return restart_syscall();
766
767 net = (struct net *)table->extra2;
768 old = *p;
769 *p = newf;
770
771 if (p == &net->ipv6.devconf_dflt->forwarding) {
772 if ((!newf) ^ (!old))
773 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
774 NETCONFA_IFINDEX_DEFAULT,
775 net->ipv6.devconf_dflt);
776 rtnl_unlock();
777 return 0;
778 }
779
780 if (p == &net->ipv6.devconf_all->forwarding) {
781 net->ipv6.devconf_dflt->forwarding = newf;
782 addrconf_forward_change(net, newf);
783 if ((!newf) ^ (!old))
784 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
785 NETCONFA_IFINDEX_ALL,
786 net->ipv6.devconf_all);
787 } else if ((!newf) ^ (!old))
788 dev_forward_change((struct inet6_dev *)table->extra1);
789 rtnl_unlock();
790
791 if (newf)
792 rt6_purge_dflt_routers(net);
793 return 1;
794 }
795
796 static void addrconf_linkdown_change(struct net *net, __s32 newf)
797 {
798 struct net_device *dev;
799 struct inet6_dev *idev;
800
801 for_each_netdev(net, dev) {
802 idev = __in6_dev_get(dev);
803 if (idev) {
804 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
805
806 idev->cnf.ignore_routes_with_linkdown = newf;
807 if (changed)
808 inet6_netconf_notify_devconf(dev_net(dev),
809 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
810 dev->ifindex,
811 &idev->cnf);
812 }
813 }
814 }
815
816 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
817 {
818 struct net *net;
819 int old;
820
821 if (!rtnl_trylock())
822 return restart_syscall();
823
824 net = (struct net *)table->extra2;
825 old = *p;
826 *p = newf;
827
828 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
829 if ((!newf) ^ (!old))
830 inet6_netconf_notify_devconf(net,
831 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
832 NETCONFA_IFINDEX_DEFAULT,
833 net->ipv6.devconf_dflt);
834 rtnl_unlock();
835 return 0;
836 }
837
838 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
839 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
840 addrconf_linkdown_change(net, newf);
841 if ((!newf) ^ (!old))
842 inet6_netconf_notify_devconf(net,
843 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
844 NETCONFA_IFINDEX_ALL,
845 net->ipv6.devconf_all);
846 }
847 rtnl_unlock();
848
849 return 1;
850 }
851
852 #endif
853
854 /* Nobody refers to this ifaddr, destroy it */
855 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
856 {
857 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
858
859 #ifdef NET_REFCNT_DEBUG
860 pr_debug("%s\n", __func__);
861 #endif
862
863 in6_dev_put(ifp->idev);
864
865 if (cancel_delayed_work(&ifp->dad_work))
866 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
867 ifp);
868
869 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
870 pr_warn("Freeing alive inet6 address %p\n", ifp);
871 return;
872 }
873 ip6_rt_put(ifp->rt);
874
875 kfree_rcu(ifp, rcu);
876 }
877
878 static void
879 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
880 {
881 struct list_head *p;
882 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
883
884 /*
885 * Each device address list is sorted in order of scope -
886 * global before linklocal.
887 */
888 list_for_each(p, &idev->addr_list) {
889 struct inet6_ifaddr *ifa
890 = list_entry(p, struct inet6_ifaddr, if_list);
891 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
892 break;
893 }
894
895 list_add_tail(&ifp->if_list, p);
896 }
897
898 static u32 inet6_addr_hash(const struct in6_addr *addr)
899 {
900 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
901 }
902
903 /* On success it returns ifp with increased reference count */
904
905 static struct inet6_ifaddr *
906 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
907 const struct in6_addr *peer_addr, int pfxlen,
908 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
909 {
910 struct inet6_ifaddr *ifa = NULL;
911 struct rt6_info *rt;
912 unsigned int hash;
913 int err = 0;
914 int addr_type = ipv6_addr_type(addr);
915
916 if (addr_type == IPV6_ADDR_ANY ||
917 addr_type & IPV6_ADDR_MULTICAST ||
918 (!(idev->dev->flags & IFF_LOOPBACK) &&
919 addr_type & IPV6_ADDR_LOOPBACK))
920 return ERR_PTR(-EADDRNOTAVAIL);
921
922 rcu_read_lock_bh();
923 if (idev->dead) {
924 err = -ENODEV; /*XXX*/
925 goto out2;
926 }
927
928 if (idev->cnf.disable_ipv6) {
929 err = -EACCES;
930 goto out2;
931 }
932
933 spin_lock(&addrconf_hash_lock);
934
935 /* Ignore adding duplicate addresses on an interface */
936 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
937 ADBG("ipv6_add_addr: already assigned\n");
938 err = -EEXIST;
939 goto out;
940 }
941
942 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
943
944 if (!ifa) {
945 ADBG("ipv6_add_addr: malloc failed\n");
946 err = -ENOBUFS;
947 goto out;
948 }
949
950 rt = addrconf_dst_alloc(idev, addr, false);
951 if (IS_ERR(rt)) {
952 err = PTR_ERR(rt);
953 goto out;
954 }
955
956 neigh_parms_data_state_setall(idev->nd_parms);
957
958 ifa->addr = *addr;
959 if (peer_addr)
960 ifa->peer_addr = *peer_addr;
961
962 spin_lock_init(&ifa->lock);
963 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
964 INIT_HLIST_NODE(&ifa->addr_lst);
965 ifa->scope = scope;
966 ifa->prefix_len = pfxlen;
967 ifa->flags = flags | IFA_F_TENTATIVE;
968 ifa->valid_lft = valid_lft;
969 ifa->prefered_lft = prefered_lft;
970 ifa->cstamp = ifa->tstamp = jiffies;
971 ifa->tokenized = false;
972
973 ifa->rt = rt;
974
975 ifa->idev = idev;
976 in6_dev_hold(idev);
977 /* For caller */
978 in6_ifa_hold(ifa);
979
980 /* Add to big hash table */
981 hash = inet6_addr_hash(addr);
982
983 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
984 spin_unlock(&addrconf_hash_lock);
985
986 write_lock(&idev->lock);
987 /* Add to inet6_dev unicast addr list. */
988 ipv6_link_dev_addr(idev, ifa);
989
990 if (ifa->flags&IFA_F_TEMPORARY) {
991 list_add(&ifa->tmp_list, &idev->tempaddr_list);
992 in6_ifa_hold(ifa);
993 }
994
995 in6_ifa_hold(ifa);
996 write_unlock(&idev->lock);
997 out2:
998 rcu_read_unlock_bh();
999
1000 if (likely(err == 0))
1001 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1002 else {
1003 kfree(ifa);
1004 ifa = ERR_PTR(err);
1005 }
1006
1007 return ifa;
1008 out:
1009 spin_unlock(&addrconf_hash_lock);
1010 goto out2;
1011 }
1012
1013 enum cleanup_prefix_rt_t {
1014 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1015 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1016 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1017 };
1018
1019 /*
1020 * Check, whether the prefix for ifp would still need a prefix route
1021 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1022 * constants.
1023 *
1024 * 1) we don't purge prefix if address was not permanent.
1025 * prefix is managed by its own lifetime.
1026 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1027 * 3) if there are no addresses, delete prefix.
1028 * 4) if there are still other permanent address(es),
1029 * corresponding prefix is still permanent.
1030 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1031 * don't purge the prefix, assume user space is managing it.
1032 * 6) otherwise, update prefix lifetime to the
1033 * longest valid lifetime among the corresponding
1034 * addresses on the device.
1035 * Note: subsequent RA will update lifetime.
1036 **/
1037 static enum cleanup_prefix_rt_t
1038 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1039 {
1040 struct inet6_ifaddr *ifa;
1041 struct inet6_dev *idev = ifp->idev;
1042 unsigned long lifetime;
1043 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1044
1045 *expires = jiffies;
1046
1047 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1048 if (ifa == ifp)
1049 continue;
1050 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1051 ifp->prefix_len))
1052 continue;
1053 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1054 return CLEANUP_PREFIX_RT_NOP;
1055
1056 action = CLEANUP_PREFIX_RT_EXPIRE;
1057
1058 spin_lock(&ifa->lock);
1059
1060 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1061 /*
1062 * Note: Because this address is
1063 * not permanent, lifetime <
1064 * LONG_MAX / HZ here.
1065 */
1066 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1067 *expires = ifa->tstamp + lifetime * HZ;
1068 spin_unlock(&ifa->lock);
1069 }
1070
1071 return action;
1072 }
1073
1074 static void
1075 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1076 {
1077 struct rt6_info *rt;
1078
1079 rt = addrconf_get_prefix_route(&ifp->addr,
1080 ifp->prefix_len,
1081 ifp->idev->dev,
1082 0, RTF_GATEWAY | RTF_DEFAULT);
1083 if (rt) {
1084 if (del_rt)
1085 ip6_del_rt(rt);
1086 else {
1087 if (!(rt->rt6i_flags & RTF_EXPIRES))
1088 rt6_set_expires(rt, expires);
1089 ip6_rt_put(rt);
1090 }
1091 }
1092 }
1093
1094
1095 /* This function wants to get referenced ifp and releases it before return */
1096
1097 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1098 {
1099 int state;
1100 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1101 unsigned long expires;
1102
1103 ASSERT_RTNL();
1104
1105 spin_lock_bh(&ifp->lock);
1106 state = ifp->state;
1107 ifp->state = INET6_IFADDR_STATE_DEAD;
1108 spin_unlock_bh(&ifp->lock);
1109
1110 if (state == INET6_IFADDR_STATE_DEAD)
1111 goto out;
1112
1113 spin_lock_bh(&addrconf_hash_lock);
1114 hlist_del_init_rcu(&ifp->addr_lst);
1115 spin_unlock_bh(&addrconf_hash_lock);
1116
1117 write_lock_bh(&ifp->idev->lock);
1118
1119 if (ifp->flags&IFA_F_TEMPORARY) {
1120 list_del(&ifp->tmp_list);
1121 if (ifp->ifpub) {
1122 in6_ifa_put(ifp->ifpub);
1123 ifp->ifpub = NULL;
1124 }
1125 __in6_ifa_put(ifp);
1126 }
1127
1128 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1129 action = check_cleanup_prefix_route(ifp, &expires);
1130
1131 list_del_init(&ifp->if_list);
1132 __in6_ifa_put(ifp);
1133
1134 write_unlock_bh(&ifp->idev->lock);
1135
1136 addrconf_del_dad_work(ifp);
1137
1138 ipv6_ifa_notify(RTM_DELADDR, ifp);
1139
1140 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1141
1142 if (action != CLEANUP_PREFIX_RT_NOP) {
1143 cleanup_prefix_route(ifp, expires,
1144 action == CLEANUP_PREFIX_RT_DEL);
1145 }
1146
1147 /* clean up prefsrc entries */
1148 rt6_remove_prefsrc(ifp);
1149 out:
1150 in6_ifa_put(ifp);
1151 }
1152
1153 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1154 {
1155 struct inet6_dev *idev = ifp->idev;
1156 struct in6_addr addr, *tmpaddr;
1157 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1158 unsigned long regen_advance;
1159 int tmp_plen;
1160 int ret = 0;
1161 u32 addr_flags;
1162 unsigned long now = jiffies;
1163
1164 write_lock_bh(&idev->lock);
1165 if (ift) {
1166 spin_lock_bh(&ift->lock);
1167 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1168 spin_unlock_bh(&ift->lock);
1169 tmpaddr = &addr;
1170 } else {
1171 tmpaddr = NULL;
1172 }
1173 retry:
1174 in6_dev_hold(idev);
1175 if (idev->cnf.use_tempaddr <= 0) {
1176 write_unlock_bh(&idev->lock);
1177 pr_info("%s: use_tempaddr is disabled\n", __func__);
1178 in6_dev_put(idev);
1179 ret = -1;
1180 goto out;
1181 }
1182 spin_lock_bh(&ifp->lock);
1183 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1184 idev->cnf.use_tempaddr = -1; /*XXX*/
1185 spin_unlock_bh(&ifp->lock);
1186 write_unlock_bh(&idev->lock);
1187 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1188 __func__);
1189 in6_dev_put(idev);
1190 ret = -1;
1191 goto out;
1192 }
1193 in6_ifa_hold(ifp);
1194 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1195 __ipv6_try_regen_rndid(idev, tmpaddr);
1196 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1197 age = (now - ifp->tstamp) / HZ;
1198 tmp_valid_lft = min_t(__u32,
1199 ifp->valid_lft,
1200 idev->cnf.temp_valid_lft + age);
1201 tmp_prefered_lft = min_t(__u32,
1202 ifp->prefered_lft,
1203 idev->cnf.temp_prefered_lft + age -
1204 idev->cnf.max_desync_factor);
1205 tmp_plen = ifp->prefix_len;
1206 tmp_tstamp = ifp->tstamp;
1207 spin_unlock_bh(&ifp->lock);
1208
1209 regen_advance = idev->cnf.regen_max_retry *
1210 idev->cnf.dad_transmits *
1211 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1212 write_unlock_bh(&idev->lock);
1213
1214 /* A temporary address is created only if this calculated Preferred
1215 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1216 * an implementation must not create a temporary address with a zero
1217 * Preferred Lifetime.
1218 * Use age calculation as in addrconf_verify to avoid unnecessary
1219 * temporary addresses being generated.
1220 */
1221 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1222 if (tmp_prefered_lft <= regen_advance + age) {
1223 in6_ifa_put(ifp);
1224 in6_dev_put(idev);
1225 ret = -1;
1226 goto out;
1227 }
1228
1229 addr_flags = IFA_F_TEMPORARY;
1230 /* set in addrconf_prefix_rcv() */
1231 if (ifp->flags & IFA_F_OPTIMISTIC)
1232 addr_flags |= IFA_F_OPTIMISTIC;
1233
1234 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1235 ipv6_addr_scope(&addr), addr_flags,
1236 tmp_valid_lft, tmp_prefered_lft);
1237 if (IS_ERR(ift)) {
1238 in6_ifa_put(ifp);
1239 in6_dev_put(idev);
1240 pr_info("%s: retry temporary address regeneration\n", __func__);
1241 tmpaddr = &addr;
1242 write_lock_bh(&idev->lock);
1243 goto retry;
1244 }
1245
1246 spin_lock_bh(&ift->lock);
1247 ift->ifpub = ifp;
1248 ift->cstamp = now;
1249 ift->tstamp = tmp_tstamp;
1250 spin_unlock_bh(&ift->lock);
1251
1252 addrconf_dad_start(ift);
1253 in6_ifa_put(ift);
1254 in6_dev_put(idev);
1255 out:
1256 return ret;
1257 }
1258
1259 /*
1260 * Choose an appropriate source address (RFC3484)
1261 */
1262 enum {
1263 IPV6_SADDR_RULE_INIT = 0,
1264 IPV6_SADDR_RULE_LOCAL,
1265 IPV6_SADDR_RULE_SCOPE,
1266 IPV6_SADDR_RULE_PREFERRED,
1267 #ifdef CONFIG_IPV6_MIP6
1268 IPV6_SADDR_RULE_HOA,
1269 #endif
1270 IPV6_SADDR_RULE_OIF,
1271 IPV6_SADDR_RULE_LABEL,
1272 IPV6_SADDR_RULE_PRIVACY,
1273 IPV6_SADDR_RULE_ORCHID,
1274 IPV6_SADDR_RULE_PREFIX,
1275 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1276 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1277 #endif
1278 IPV6_SADDR_RULE_MAX
1279 };
1280
1281 struct ipv6_saddr_score {
1282 int rule;
1283 int addr_type;
1284 struct inet6_ifaddr *ifa;
1285 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1286 int scopedist;
1287 int matchlen;
1288 };
1289
1290 struct ipv6_saddr_dst {
1291 const struct in6_addr *addr;
1292 int ifindex;
1293 int scope;
1294 int label;
1295 unsigned int prefs;
1296 };
1297
1298 static inline int ipv6_saddr_preferred(int type)
1299 {
1300 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1301 return 1;
1302 return 0;
1303 }
1304
1305 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1306 {
1307 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1308 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1309 #else
1310 return false;
1311 #endif
1312 }
1313
1314 static int ipv6_get_saddr_eval(struct net *net,
1315 struct ipv6_saddr_score *score,
1316 struct ipv6_saddr_dst *dst,
1317 int i)
1318 {
1319 int ret;
1320
1321 if (i <= score->rule) {
1322 switch (i) {
1323 case IPV6_SADDR_RULE_SCOPE:
1324 ret = score->scopedist;
1325 break;
1326 case IPV6_SADDR_RULE_PREFIX:
1327 ret = score->matchlen;
1328 break;
1329 default:
1330 ret = !!test_bit(i, score->scorebits);
1331 }
1332 goto out;
1333 }
1334
1335 switch (i) {
1336 case IPV6_SADDR_RULE_INIT:
1337 /* Rule 0: remember if hiscore is not ready yet */
1338 ret = !!score->ifa;
1339 break;
1340 case IPV6_SADDR_RULE_LOCAL:
1341 /* Rule 1: Prefer same address */
1342 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1343 break;
1344 case IPV6_SADDR_RULE_SCOPE:
1345 /* Rule 2: Prefer appropriate scope
1346 *
1347 * ret
1348 * ^
1349 * -1 | d 15
1350 * ---+--+-+---> scope
1351 * |
1352 * | d is scope of the destination.
1353 * B-d | \
1354 * | \ <- smaller scope is better if
1355 * B-15 | \ if scope is enough for destination.
1356 * | ret = B - scope (-1 <= scope >= d <= 15).
1357 * d-C-1 | /
1358 * |/ <- greater is better
1359 * -C / if scope is not enough for destination.
1360 * /| ret = scope - C (-1 <= d < scope <= 15).
1361 *
1362 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1363 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1364 * Assume B = 0 and we get C > 29.
1365 */
1366 ret = __ipv6_addr_src_scope(score->addr_type);
1367 if (ret >= dst->scope)
1368 ret = -ret;
1369 else
1370 ret -= 128; /* 30 is enough */
1371 score->scopedist = ret;
1372 break;
1373 case IPV6_SADDR_RULE_PREFERRED:
1374 {
1375 /* Rule 3: Avoid deprecated and optimistic addresses */
1376 u8 avoid = IFA_F_DEPRECATED;
1377
1378 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1379 avoid |= IFA_F_OPTIMISTIC;
1380 ret = ipv6_saddr_preferred(score->addr_type) ||
1381 !(score->ifa->flags & avoid);
1382 break;
1383 }
1384 #ifdef CONFIG_IPV6_MIP6
1385 case IPV6_SADDR_RULE_HOA:
1386 {
1387 /* Rule 4: Prefer home address */
1388 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1389 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1390 break;
1391 }
1392 #endif
1393 case IPV6_SADDR_RULE_OIF:
1394 /* Rule 5: Prefer outgoing interface */
1395 ret = (!dst->ifindex ||
1396 dst->ifindex == score->ifa->idev->dev->ifindex);
1397 break;
1398 case IPV6_SADDR_RULE_LABEL:
1399 /* Rule 6: Prefer matching label */
1400 ret = ipv6_addr_label(net,
1401 &score->ifa->addr, score->addr_type,
1402 score->ifa->idev->dev->ifindex) == dst->label;
1403 break;
1404 case IPV6_SADDR_RULE_PRIVACY:
1405 {
1406 /* Rule 7: Prefer public address
1407 * Note: prefer temporary address if use_tempaddr >= 2
1408 */
1409 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1410 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1411 score->ifa->idev->cnf.use_tempaddr >= 2;
1412 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1413 break;
1414 }
1415 case IPV6_SADDR_RULE_ORCHID:
1416 /* Rule 8-: Prefer ORCHID vs ORCHID or
1417 * non-ORCHID vs non-ORCHID
1418 */
1419 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1420 ipv6_addr_orchid(dst->addr));
1421 break;
1422 case IPV6_SADDR_RULE_PREFIX:
1423 /* Rule 8: Use longest matching prefix */
1424 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1425 if (ret > score->ifa->prefix_len)
1426 ret = score->ifa->prefix_len;
1427 score->matchlen = ret;
1428 break;
1429 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1430 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1431 /* Optimistic addresses still have lower precedence than other
1432 * preferred addresses.
1433 */
1434 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1435 break;
1436 #endif
1437 default:
1438 ret = 0;
1439 }
1440
1441 if (ret)
1442 __set_bit(i, score->scorebits);
1443 score->rule = i;
1444 out:
1445 return ret;
1446 }
1447
1448 static int __ipv6_dev_get_saddr(struct net *net,
1449 struct ipv6_saddr_dst *dst,
1450 struct inet6_dev *idev,
1451 struct ipv6_saddr_score *scores,
1452 int hiscore_idx)
1453 {
1454 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1455
1456 read_lock_bh(&idev->lock);
1457 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1458 int i;
1459
1460 /*
1461 * - Tentative Address (RFC2462 section 5.4)
1462 * - A tentative address is not considered
1463 * "assigned to an interface" in the traditional
1464 * sense, unless it is also flagged as optimistic.
1465 * - Candidate Source Address (section 4)
1466 * - In any case, anycast addresses, multicast
1467 * addresses, and the unspecified address MUST
1468 * NOT be included in a candidate set.
1469 */
1470 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1471 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1472 continue;
1473
1474 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1475
1476 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1477 score->addr_type & IPV6_ADDR_MULTICAST)) {
1478 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1479 idev->dev->name);
1480 continue;
1481 }
1482
1483 score->rule = -1;
1484 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1485
1486 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1487 int minihiscore, miniscore;
1488
1489 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1490 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1491
1492 if (minihiscore > miniscore) {
1493 if (i == IPV6_SADDR_RULE_SCOPE &&
1494 score->scopedist > 0) {
1495 /*
1496 * special case:
1497 * each remaining entry
1498 * has too small (not enough)
1499 * scope, because ifa entries
1500 * are sorted by their scope
1501 * values.
1502 */
1503 goto out;
1504 }
1505 break;
1506 } else if (minihiscore < miniscore) {
1507 if (hiscore->ifa)
1508 in6_ifa_put(hiscore->ifa);
1509
1510 in6_ifa_hold(score->ifa);
1511
1512 swap(hiscore, score);
1513 hiscore_idx = 1 - hiscore_idx;
1514
1515 /* restore our iterator */
1516 score->ifa = hiscore->ifa;
1517
1518 break;
1519 }
1520 }
1521 }
1522 out:
1523 read_unlock_bh(&idev->lock);
1524 return hiscore_idx;
1525 }
1526
1527 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1528 const struct in6_addr *daddr, unsigned int prefs,
1529 struct in6_addr *saddr)
1530 {
1531 struct ipv6_saddr_score scores[2], *hiscore;
1532 struct ipv6_saddr_dst dst;
1533 struct inet6_dev *idev;
1534 struct net_device *dev;
1535 int dst_type;
1536 bool use_oif_addr = false;
1537 int hiscore_idx = 0;
1538
1539 dst_type = __ipv6_addr_type(daddr);
1540 dst.addr = daddr;
1541 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1542 dst.scope = __ipv6_addr_src_scope(dst_type);
1543 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1544 dst.prefs = prefs;
1545
1546 scores[hiscore_idx].rule = -1;
1547 scores[hiscore_idx].ifa = NULL;
1548
1549 rcu_read_lock();
1550
1551 /* Candidate Source Address (section 4)
1552 * - multicast and link-local destination address,
1553 * the set of candidate source address MUST only
1554 * include addresses assigned to interfaces
1555 * belonging to the same link as the outgoing
1556 * interface.
1557 * (- For site-local destination addresses, the
1558 * set of candidate source addresses MUST only
1559 * include addresses assigned to interfaces
1560 * belonging to the same site as the outgoing
1561 * interface.)
1562 * - "It is RECOMMENDED that the candidate source addresses
1563 * be the set of unicast addresses assigned to the
1564 * interface that will be used to send to the destination
1565 * (the 'outgoing' interface)." (RFC 6724)
1566 */
1567 if (dst_dev) {
1568 idev = __in6_dev_get(dst_dev);
1569 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1570 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1571 (idev && idev->cnf.use_oif_addrs_only)) {
1572 use_oif_addr = true;
1573 }
1574 }
1575
1576 if (use_oif_addr) {
1577 if (idev)
1578 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1579 } else {
1580 for_each_netdev_rcu(net, dev) {
1581 idev = __in6_dev_get(dev);
1582 if (!idev)
1583 continue;
1584 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1585 }
1586 }
1587 rcu_read_unlock();
1588
1589 hiscore = &scores[hiscore_idx];
1590 if (!hiscore->ifa)
1591 return -EADDRNOTAVAIL;
1592
1593 *saddr = hiscore->ifa->addr;
1594 in6_ifa_put(hiscore->ifa);
1595 return 0;
1596 }
1597 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1598
1599 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1600 u32 banned_flags)
1601 {
1602 struct inet6_ifaddr *ifp;
1603 int err = -EADDRNOTAVAIL;
1604
1605 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1606 if (ifp->scope > IFA_LINK)
1607 break;
1608 if (ifp->scope == IFA_LINK &&
1609 !(ifp->flags & banned_flags)) {
1610 *addr = ifp->addr;
1611 err = 0;
1612 break;
1613 }
1614 }
1615 return err;
1616 }
1617
1618 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1619 u32 banned_flags)
1620 {
1621 struct inet6_dev *idev;
1622 int err = -EADDRNOTAVAIL;
1623
1624 rcu_read_lock();
1625 idev = __in6_dev_get(dev);
1626 if (idev) {
1627 read_lock_bh(&idev->lock);
1628 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1629 read_unlock_bh(&idev->lock);
1630 }
1631 rcu_read_unlock();
1632 return err;
1633 }
1634
1635 static int ipv6_count_addresses(struct inet6_dev *idev)
1636 {
1637 int cnt = 0;
1638 struct inet6_ifaddr *ifp;
1639
1640 read_lock_bh(&idev->lock);
1641 list_for_each_entry(ifp, &idev->addr_list, if_list)
1642 cnt++;
1643 read_unlock_bh(&idev->lock);
1644 return cnt;
1645 }
1646
1647 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1648 const struct net_device *dev, int strict)
1649 {
1650 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1651 }
1652 EXPORT_SYMBOL(ipv6_chk_addr);
1653
1654 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1655 const struct net_device *dev, int strict,
1656 u32 banned_flags)
1657 {
1658 struct inet6_ifaddr *ifp;
1659 unsigned int hash = inet6_addr_hash(addr);
1660 u32 ifp_flags;
1661
1662 rcu_read_lock_bh();
1663 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1664 if (!net_eq(dev_net(ifp->idev->dev), net))
1665 continue;
1666 /* Decouple optimistic from tentative for evaluation here.
1667 * Ban optimistic addresses explicitly, when required.
1668 */
1669 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1670 ? (ifp->flags&~IFA_F_TENTATIVE)
1671 : ifp->flags;
1672 if (ipv6_addr_equal(&ifp->addr, addr) &&
1673 !(ifp_flags&banned_flags) &&
1674 (!dev || ifp->idev->dev == dev ||
1675 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1676 rcu_read_unlock_bh();
1677 return 1;
1678 }
1679 }
1680
1681 rcu_read_unlock_bh();
1682 return 0;
1683 }
1684 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1685
1686 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1687 struct net_device *dev)
1688 {
1689 unsigned int hash = inet6_addr_hash(addr);
1690 struct inet6_ifaddr *ifp;
1691
1692 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1693 if (!net_eq(dev_net(ifp->idev->dev), net))
1694 continue;
1695 if (ipv6_addr_equal(&ifp->addr, addr)) {
1696 if (!dev || ifp->idev->dev == dev)
1697 return true;
1698 }
1699 }
1700 return false;
1701 }
1702
1703 /* Compares an address/prefix_len with addresses on device @dev.
1704 * If one is found it returns true.
1705 */
1706 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1707 const unsigned int prefix_len, struct net_device *dev)
1708 {
1709 struct inet6_dev *idev;
1710 struct inet6_ifaddr *ifa;
1711 bool ret = false;
1712
1713 rcu_read_lock();
1714 idev = __in6_dev_get(dev);
1715 if (idev) {
1716 read_lock_bh(&idev->lock);
1717 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1718 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1719 if (ret)
1720 break;
1721 }
1722 read_unlock_bh(&idev->lock);
1723 }
1724 rcu_read_unlock();
1725
1726 return ret;
1727 }
1728 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1729
1730 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1731 {
1732 struct inet6_dev *idev;
1733 struct inet6_ifaddr *ifa;
1734 int onlink;
1735
1736 onlink = 0;
1737 rcu_read_lock();
1738 idev = __in6_dev_get(dev);
1739 if (idev) {
1740 read_lock_bh(&idev->lock);
1741 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1742 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1743 ifa->prefix_len);
1744 if (onlink)
1745 break;
1746 }
1747 read_unlock_bh(&idev->lock);
1748 }
1749 rcu_read_unlock();
1750 return onlink;
1751 }
1752 EXPORT_SYMBOL(ipv6_chk_prefix);
1753
1754 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1755 struct net_device *dev, int strict)
1756 {
1757 struct inet6_ifaddr *ifp, *result = NULL;
1758 unsigned int hash = inet6_addr_hash(addr);
1759
1760 rcu_read_lock_bh();
1761 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1762 if (!net_eq(dev_net(ifp->idev->dev), net))
1763 continue;
1764 if (ipv6_addr_equal(&ifp->addr, addr)) {
1765 if (!dev || ifp->idev->dev == dev ||
1766 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1767 result = ifp;
1768 in6_ifa_hold(ifp);
1769 break;
1770 }
1771 }
1772 }
1773 rcu_read_unlock_bh();
1774
1775 return result;
1776 }
1777
1778 /* Gets referenced address, destroys ifaddr */
1779
1780 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1781 {
1782 if (dad_failed)
1783 ifp->flags |= IFA_F_DADFAILED;
1784
1785 if (ifp->flags&IFA_F_PERMANENT) {
1786 spin_lock_bh(&ifp->lock);
1787 addrconf_del_dad_work(ifp);
1788 ifp->flags |= IFA_F_TENTATIVE;
1789 spin_unlock_bh(&ifp->lock);
1790 if (dad_failed)
1791 ipv6_ifa_notify(0, ifp);
1792 in6_ifa_put(ifp);
1793 } else if (ifp->flags&IFA_F_TEMPORARY) {
1794 struct inet6_ifaddr *ifpub;
1795 spin_lock_bh(&ifp->lock);
1796 ifpub = ifp->ifpub;
1797 if (ifpub) {
1798 in6_ifa_hold(ifpub);
1799 spin_unlock_bh(&ifp->lock);
1800 ipv6_create_tempaddr(ifpub, ifp);
1801 in6_ifa_put(ifpub);
1802 } else {
1803 spin_unlock_bh(&ifp->lock);
1804 }
1805 ipv6_del_addr(ifp);
1806 } else {
1807 ipv6_del_addr(ifp);
1808 }
1809 }
1810
1811 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1812 {
1813 int err = -ENOENT;
1814
1815 spin_lock_bh(&ifp->lock);
1816 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1817 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1818 err = 0;
1819 }
1820 spin_unlock_bh(&ifp->lock);
1821
1822 return err;
1823 }
1824
1825 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1826 {
1827 struct in6_addr addr;
1828 struct inet6_dev *idev = ifp->idev;
1829 struct net *net = dev_net(ifp->idev->dev);
1830
1831 if (addrconf_dad_end(ifp)) {
1832 in6_ifa_put(ifp);
1833 return;
1834 }
1835
1836 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1837 ifp->idev->dev->name, &ifp->addr);
1838
1839 spin_lock_bh(&ifp->lock);
1840
1841 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1842 int scope = ifp->scope;
1843 u32 flags = ifp->flags;
1844 struct in6_addr new_addr;
1845 struct inet6_ifaddr *ifp2;
1846 u32 valid_lft, preferred_lft;
1847 int pfxlen = ifp->prefix_len;
1848 int retries = ifp->stable_privacy_retry + 1;
1849
1850 if (retries > net->ipv6.sysctl.idgen_retries) {
1851 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1852 ifp->idev->dev->name);
1853 goto errdad;
1854 }
1855
1856 new_addr = ifp->addr;
1857 if (ipv6_generate_stable_address(&new_addr, retries,
1858 idev))
1859 goto errdad;
1860
1861 valid_lft = ifp->valid_lft;
1862 preferred_lft = ifp->prefered_lft;
1863
1864 spin_unlock_bh(&ifp->lock);
1865
1866 if (idev->cnf.max_addresses &&
1867 ipv6_count_addresses(idev) >=
1868 idev->cnf.max_addresses)
1869 goto lock_errdad;
1870
1871 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1872 ifp->idev->dev->name);
1873
1874 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1875 scope, flags, valid_lft,
1876 preferred_lft);
1877 if (IS_ERR(ifp2))
1878 goto lock_errdad;
1879
1880 spin_lock_bh(&ifp2->lock);
1881 ifp2->stable_privacy_retry = retries;
1882 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1883 spin_unlock_bh(&ifp2->lock);
1884
1885 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1886 in6_ifa_put(ifp2);
1887 lock_errdad:
1888 spin_lock_bh(&ifp->lock);
1889 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1890 addr.s6_addr32[0] = htonl(0xfe800000);
1891 addr.s6_addr32[1] = 0;
1892
1893 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1894 ipv6_addr_equal(&ifp->addr, &addr)) {
1895 /* DAD failed for link-local based on MAC address */
1896 idev->cnf.disable_ipv6 = 1;
1897
1898 pr_info("%s: IPv6 being disabled!\n",
1899 ifp->idev->dev->name);
1900 }
1901 }
1902
1903 errdad:
1904 /* transition from _POSTDAD to _ERRDAD */
1905 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1906 spin_unlock_bh(&ifp->lock);
1907
1908 addrconf_mod_dad_work(ifp, 0);
1909 }
1910
1911 /* Join to solicited addr multicast group.
1912 * caller must hold RTNL */
1913 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1914 {
1915 struct in6_addr maddr;
1916
1917 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1918 return;
1919
1920 addrconf_addr_solict_mult(addr, &maddr);
1921 ipv6_dev_mc_inc(dev, &maddr);
1922 }
1923
1924 /* caller must hold RTNL */
1925 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1926 {
1927 struct in6_addr maddr;
1928
1929 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1930 return;
1931
1932 addrconf_addr_solict_mult(addr, &maddr);
1933 __ipv6_dev_mc_dec(idev, &maddr);
1934 }
1935
1936 /* caller must hold RTNL */
1937 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1938 {
1939 struct in6_addr addr;
1940
1941 if (ifp->prefix_len >= 127) /* RFC 6164 */
1942 return;
1943 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1944 if (ipv6_addr_any(&addr))
1945 return;
1946 __ipv6_dev_ac_inc(ifp->idev, &addr);
1947 }
1948
1949 /* caller must hold RTNL */
1950 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1951 {
1952 struct in6_addr addr;
1953
1954 if (ifp->prefix_len >= 127) /* RFC 6164 */
1955 return;
1956 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1957 if (ipv6_addr_any(&addr))
1958 return;
1959 __ipv6_dev_ac_dec(ifp->idev, &addr);
1960 }
1961
1962 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1963 {
1964 if (dev->addr_len != EUI64_ADDR_LEN)
1965 return -1;
1966 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
1967 eui[0] ^= 2;
1968 return 0;
1969 }
1970
1971 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1972 {
1973 union fwnet_hwaddr *ha;
1974
1975 if (dev->addr_len != FWNET_ALEN)
1976 return -1;
1977
1978 ha = (union fwnet_hwaddr *)dev->dev_addr;
1979
1980 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1981 eui[0] ^= 2;
1982 return 0;
1983 }
1984
1985 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1986 {
1987 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1988 if (dev->addr_len != ARCNET_ALEN)
1989 return -1;
1990 memset(eui, 0, 7);
1991 eui[7] = *(u8 *)dev->dev_addr;
1992 return 0;
1993 }
1994
1995 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1996 {
1997 if (dev->addr_len != INFINIBAND_ALEN)
1998 return -1;
1999 memcpy(eui, dev->dev_addr + 12, 8);
2000 eui[0] |= 2;
2001 return 0;
2002 }
2003
2004 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2005 {
2006 if (addr == 0)
2007 return -1;
2008 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2009 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2010 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2011 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2012 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2013 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2014 eui[1] = 0;
2015 eui[2] = 0x5E;
2016 eui[3] = 0xFE;
2017 memcpy(eui + 4, &addr, 4);
2018 return 0;
2019 }
2020
2021 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2022 {
2023 if (dev->priv_flags & IFF_ISATAP)
2024 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2025 return -1;
2026 }
2027
2028 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2029 {
2030 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2031 }
2032
2033 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2034 {
2035 memcpy(eui, dev->perm_addr, 3);
2036 memcpy(eui + 5, dev->perm_addr + 3, 3);
2037 eui[3] = 0xFF;
2038 eui[4] = 0xFE;
2039 eui[0] ^= 2;
2040 return 0;
2041 }
2042
2043 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2044 {
2045 switch (dev->type) {
2046 case ARPHRD_ETHER:
2047 case ARPHRD_FDDI:
2048 return addrconf_ifid_eui48(eui, dev);
2049 case ARPHRD_ARCNET:
2050 return addrconf_ifid_arcnet(eui, dev);
2051 case ARPHRD_INFINIBAND:
2052 return addrconf_ifid_infiniband(eui, dev);
2053 case ARPHRD_SIT:
2054 return addrconf_ifid_sit(eui, dev);
2055 case ARPHRD_IPGRE:
2056 return addrconf_ifid_gre(eui, dev);
2057 case ARPHRD_6LOWPAN:
2058 return addrconf_ifid_eui64(eui, dev);
2059 case ARPHRD_IEEE1394:
2060 return addrconf_ifid_ieee1394(eui, dev);
2061 case ARPHRD_TUNNEL6:
2062 return addrconf_ifid_ip6tnl(eui, dev);
2063 }
2064 return -1;
2065 }
2066
2067 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2068 {
2069 int err = -1;
2070 struct inet6_ifaddr *ifp;
2071
2072 read_lock_bh(&idev->lock);
2073 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2074 if (ifp->scope > IFA_LINK)
2075 break;
2076 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2077 memcpy(eui, ifp->addr.s6_addr+8, 8);
2078 err = 0;
2079 break;
2080 }
2081 }
2082 read_unlock_bh(&idev->lock);
2083 return err;
2084 }
2085
2086 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2087 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2088 {
2089 regen:
2090 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2091 idev->rndid[0] &= ~0x02;
2092
2093 /*
2094 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2095 * check if generated address is not inappropriate
2096 *
2097 * - Reserved subnet anycast (RFC 2526)
2098 * 11111101 11....11 1xxxxxxx
2099 * - ISATAP (RFC4214) 6.1
2100 * 00-00-5E-FE-xx-xx-xx-xx
2101 * - value 0
2102 * - XXX: already assigned to an address on the device
2103 */
2104 if (idev->rndid[0] == 0xfd &&
2105 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2106 (idev->rndid[7]&0x80))
2107 goto regen;
2108 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2109 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2110 goto regen;
2111 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2112 goto regen;
2113 }
2114 }
2115
2116 static void ipv6_regen_rndid(unsigned long data)
2117 {
2118 struct inet6_dev *idev = (struct inet6_dev *) data;
2119 unsigned long expires;
2120
2121 rcu_read_lock_bh();
2122 write_lock_bh(&idev->lock);
2123
2124 if (idev->dead)
2125 goto out;
2126
2127 __ipv6_regen_rndid(idev);
2128
2129 expires = jiffies +
2130 idev->cnf.temp_prefered_lft * HZ -
2131 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2132 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2133 idev->cnf.max_desync_factor * HZ;
2134 if (time_before(expires, jiffies)) {
2135 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2136 __func__, idev->dev->name);
2137 goto out;
2138 }
2139
2140 if (!mod_timer(&idev->regen_timer, expires))
2141 in6_dev_hold(idev);
2142
2143 out:
2144 write_unlock_bh(&idev->lock);
2145 rcu_read_unlock_bh();
2146 in6_dev_put(idev);
2147 }
2148
2149 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2150 {
2151 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2152 __ipv6_regen_rndid(idev);
2153 }
2154
2155 /*
2156 * Add prefix route.
2157 */
2158
2159 static void
2160 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2161 unsigned long expires, u32 flags)
2162 {
2163 struct fib6_config cfg = {
2164 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2165 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2166 .fc_ifindex = dev->ifindex,
2167 .fc_expires = expires,
2168 .fc_dst_len = plen,
2169 .fc_flags = RTF_UP | flags,
2170 .fc_nlinfo.nl_net = dev_net(dev),
2171 .fc_protocol = RTPROT_KERNEL,
2172 };
2173
2174 cfg.fc_dst = *pfx;
2175
2176 /* Prevent useless cloning on PtP SIT.
2177 This thing is done here expecting that the whole
2178 class of non-broadcast devices need not cloning.
2179 */
2180 #if IS_ENABLED(CONFIG_IPV6_SIT)
2181 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2182 cfg.fc_flags |= RTF_NONEXTHOP;
2183 #endif
2184
2185 ip6_route_add(&cfg);
2186 }
2187
2188
2189 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2190 int plen,
2191 const struct net_device *dev,
2192 u32 flags, u32 noflags)
2193 {
2194 struct fib6_node *fn;
2195 struct rt6_info *rt = NULL;
2196 struct fib6_table *table;
2197 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2198
2199 table = fib6_get_table(dev_net(dev), tb_id);
2200 if (!table)
2201 return NULL;
2202
2203 read_lock_bh(&table->tb6_lock);
2204 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2205 if (!fn)
2206 goto out;
2207
2208 noflags |= RTF_CACHE;
2209 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2210 if (rt->dst.dev->ifindex != dev->ifindex)
2211 continue;
2212 if ((rt->rt6i_flags & flags) != flags)
2213 continue;
2214 if ((rt->rt6i_flags & noflags) != 0)
2215 continue;
2216 dst_hold(&rt->dst);
2217 break;
2218 }
2219 out:
2220 read_unlock_bh(&table->tb6_lock);
2221 return rt;
2222 }
2223
2224
2225 /* Create "default" multicast route to the interface */
2226
2227 static void addrconf_add_mroute(struct net_device *dev)
2228 {
2229 struct fib6_config cfg = {
2230 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2231 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2232 .fc_ifindex = dev->ifindex,
2233 .fc_dst_len = 8,
2234 .fc_flags = RTF_UP,
2235 .fc_nlinfo.nl_net = dev_net(dev),
2236 };
2237
2238 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2239
2240 ip6_route_add(&cfg);
2241 }
2242
2243 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2244 {
2245 struct inet6_dev *idev;
2246
2247 ASSERT_RTNL();
2248
2249 idev = ipv6_find_idev(dev);
2250 if (!idev)
2251 return ERR_PTR(-ENOBUFS);
2252
2253 if (idev->cnf.disable_ipv6)
2254 return ERR_PTR(-EACCES);
2255
2256 /* Add default multicast route */
2257 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2258 addrconf_add_mroute(dev);
2259
2260 return idev;
2261 }
2262
2263 static void manage_tempaddrs(struct inet6_dev *idev,
2264 struct inet6_ifaddr *ifp,
2265 __u32 valid_lft, __u32 prefered_lft,
2266 bool create, unsigned long now)
2267 {
2268 u32 flags;
2269 struct inet6_ifaddr *ift;
2270
2271 read_lock_bh(&idev->lock);
2272 /* update all temporary addresses in the list */
2273 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2274 int age, max_valid, max_prefered;
2275
2276 if (ifp != ift->ifpub)
2277 continue;
2278
2279 /* RFC 4941 section 3.3:
2280 * If a received option will extend the lifetime of a public
2281 * address, the lifetimes of temporary addresses should
2282 * be extended, subject to the overall constraint that no
2283 * temporary addresses should ever remain "valid" or "preferred"
2284 * for a time longer than (TEMP_VALID_LIFETIME) or
2285 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2286 */
2287 age = (now - ift->cstamp) / HZ;
2288 max_valid = idev->cnf.temp_valid_lft - age;
2289 if (max_valid < 0)
2290 max_valid = 0;
2291
2292 max_prefered = idev->cnf.temp_prefered_lft -
2293 idev->cnf.max_desync_factor - age;
2294 if (max_prefered < 0)
2295 max_prefered = 0;
2296
2297 if (valid_lft > max_valid)
2298 valid_lft = max_valid;
2299
2300 if (prefered_lft > max_prefered)
2301 prefered_lft = max_prefered;
2302
2303 spin_lock(&ift->lock);
2304 flags = ift->flags;
2305 ift->valid_lft = valid_lft;
2306 ift->prefered_lft = prefered_lft;
2307 ift->tstamp = now;
2308 if (prefered_lft > 0)
2309 ift->flags &= ~IFA_F_DEPRECATED;
2310
2311 spin_unlock(&ift->lock);
2312 if (!(flags&IFA_F_TENTATIVE))
2313 ipv6_ifa_notify(0, ift);
2314 }
2315
2316 if ((create || list_empty(&idev->tempaddr_list)) &&
2317 idev->cnf.use_tempaddr > 0) {
2318 /* When a new public address is created as described
2319 * in [ADDRCONF], also create a new temporary address.
2320 * Also create a temporary address if it's enabled but
2321 * no temporary address currently exists.
2322 */
2323 read_unlock_bh(&idev->lock);
2324 ipv6_create_tempaddr(ifp, NULL);
2325 } else {
2326 read_unlock_bh(&idev->lock);
2327 }
2328 }
2329
2330 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2331 {
2332 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2333 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2334 }
2335
2336 static int addrconf_prefix_rcv_add_addr(struct net *net,
2337 struct net_device *dev,
2338 const struct prefix_info *pinfo,
2339 struct inet6_dev *in6_dev,
2340 const struct in6_addr *addr,
2341 int addr_type, u32 addr_flags,
2342 bool sllao, bool tokenized,
2343 __u32 valid_lft, u32 prefered_lft)
2344 {
2345 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2346 int create = 0, update_lft = 0;
2347
2348 if (!ifp && valid_lft) {
2349 int max_addresses = in6_dev->cnf.max_addresses;
2350
2351 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2352 if (in6_dev->cnf.optimistic_dad &&
2353 !net->ipv6.devconf_all->forwarding && sllao)
2354 addr_flags |= IFA_F_OPTIMISTIC;
2355 #endif
2356
2357 /* Do not allow to create too much of autoconfigured
2358 * addresses; this would be too easy way to crash kernel.
2359 */
2360 if (!max_addresses ||
2361 ipv6_count_addresses(in6_dev) < max_addresses)
2362 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2363 pinfo->prefix_len,
2364 addr_type&IPV6_ADDR_SCOPE_MASK,
2365 addr_flags, valid_lft,
2366 prefered_lft);
2367
2368 if (IS_ERR_OR_NULL(ifp))
2369 return -1;
2370
2371 update_lft = 0;
2372 create = 1;
2373 spin_lock_bh(&ifp->lock);
2374 ifp->flags |= IFA_F_MANAGETEMPADDR;
2375 ifp->cstamp = jiffies;
2376 ifp->tokenized = tokenized;
2377 spin_unlock_bh(&ifp->lock);
2378 addrconf_dad_start(ifp);
2379 }
2380
2381 if (ifp) {
2382 u32 flags;
2383 unsigned long now;
2384 u32 stored_lft;
2385
2386 /* update lifetime (RFC2462 5.5.3 e) */
2387 spin_lock_bh(&ifp->lock);
2388 now = jiffies;
2389 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2390 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2391 else
2392 stored_lft = 0;
2393 if (!update_lft && !create && stored_lft) {
2394 const u32 minimum_lft = min_t(u32,
2395 stored_lft, MIN_VALID_LIFETIME);
2396 valid_lft = max(valid_lft, minimum_lft);
2397
2398 /* RFC4862 Section 5.5.3e:
2399 * "Note that the preferred lifetime of the
2400 * corresponding address is always reset to
2401 * the Preferred Lifetime in the received
2402 * Prefix Information option, regardless of
2403 * whether the valid lifetime is also reset or
2404 * ignored."
2405 *
2406 * So we should always update prefered_lft here.
2407 */
2408 update_lft = 1;
2409 }
2410
2411 if (update_lft) {
2412 ifp->valid_lft = valid_lft;
2413 ifp->prefered_lft = prefered_lft;
2414 ifp->tstamp = now;
2415 flags = ifp->flags;
2416 ifp->flags &= ~IFA_F_DEPRECATED;
2417 spin_unlock_bh(&ifp->lock);
2418
2419 if (!(flags&IFA_F_TENTATIVE))
2420 ipv6_ifa_notify(0, ifp);
2421 } else
2422 spin_unlock_bh(&ifp->lock);
2423
2424 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2425 create, now);
2426
2427 in6_ifa_put(ifp);
2428 addrconf_verify();
2429 }
2430
2431 return 0;
2432 }
2433
2434 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2435 {
2436 struct prefix_info *pinfo;
2437 __u32 valid_lft;
2438 __u32 prefered_lft;
2439 int addr_type, err;
2440 u32 addr_flags = 0;
2441 struct inet6_dev *in6_dev;
2442 struct net *net = dev_net(dev);
2443
2444 pinfo = (struct prefix_info *) opt;
2445
2446 if (len < sizeof(struct prefix_info)) {
2447 ADBG("addrconf: prefix option too short\n");
2448 return;
2449 }
2450
2451 /*
2452 * Validation checks ([ADDRCONF], page 19)
2453 */
2454
2455 addr_type = ipv6_addr_type(&pinfo->prefix);
2456
2457 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2458 return;
2459
2460 valid_lft = ntohl(pinfo->valid);
2461 prefered_lft = ntohl(pinfo->prefered);
2462
2463 if (prefered_lft > valid_lft) {
2464 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2465 return;
2466 }
2467
2468 in6_dev = in6_dev_get(dev);
2469
2470 if (!in6_dev) {
2471 net_dbg_ratelimited("addrconf: device %s not configured\n",
2472 dev->name);
2473 return;
2474 }
2475
2476 /*
2477 * Two things going on here:
2478 * 1) Add routes for on-link prefixes
2479 * 2) Configure prefixes with the auto flag set
2480 */
2481
2482 if (pinfo->onlink) {
2483 struct rt6_info *rt;
2484 unsigned long rt_expires;
2485
2486 /* Avoid arithmetic overflow. Really, we could
2487 * save rt_expires in seconds, likely valid_lft,
2488 * but it would require division in fib gc, that it
2489 * not good.
2490 */
2491 if (HZ > USER_HZ)
2492 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2493 else
2494 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2495
2496 if (addrconf_finite_timeout(rt_expires))
2497 rt_expires *= HZ;
2498
2499 rt = addrconf_get_prefix_route(&pinfo->prefix,
2500 pinfo->prefix_len,
2501 dev,
2502 RTF_ADDRCONF | RTF_PREFIX_RT,
2503 RTF_GATEWAY | RTF_DEFAULT);
2504
2505 if (rt) {
2506 /* Autoconf prefix route */
2507 if (valid_lft == 0) {
2508 ip6_del_rt(rt);
2509 rt = NULL;
2510 } else if (addrconf_finite_timeout(rt_expires)) {
2511 /* not infinity */
2512 rt6_set_expires(rt, jiffies + rt_expires);
2513 } else {
2514 rt6_clean_expires(rt);
2515 }
2516 } else if (valid_lft) {
2517 clock_t expires = 0;
2518 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2519 if (addrconf_finite_timeout(rt_expires)) {
2520 /* not infinity */
2521 flags |= RTF_EXPIRES;
2522 expires = jiffies_to_clock_t(rt_expires);
2523 }
2524 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2525 dev, expires, flags);
2526 }
2527 ip6_rt_put(rt);
2528 }
2529
2530 /* Try to figure out our local address for this prefix */
2531
2532 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2533 struct in6_addr addr;
2534 bool tokenized = false, dev_addr_generated = false;
2535
2536 if (pinfo->prefix_len == 64) {
2537 memcpy(&addr, &pinfo->prefix, 8);
2538
2539 if (!ipv6_addr_any(&in6_dev->token)) {
2540 read_lock_bh(&in6_dev->lock);
2541 memcpy(addr.s6_addr + 8,
2542 in6_dev->token.s6_addr + 8, 8);
2543 read_unlock_bh(&in6_dev->lock);
2544 tokenized = true;
2545 } else if (is_addr_mode_generate_stable(in6_dev) &&
2546 !ipv6_generate_stable_address(&addr, 0,
2547 in6_dev)) {
2548 addr_flags |= IFA_F_STABLE_PRIVACY;
2549 goto ok;
2550 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2551 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2552 goto put;
2553 } else {
2554 dev_addr_generated = true;
2555 }
2556 goto ok;
2557 }
2558 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2559 pinfo->prefix_len);
2560 goto put;
2561
2562 ok:
2563 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2564 &addr, addr_type,
2565 addr_flags, sllao,
2566 tokenized, valid_lft,
2567 prefered_lft);
2568 if (err)
2569 goto put;
2570
2571 /* Ignore error case here because previous prefix add addr was
2572 * successful which will be notified.
2573 */
2574 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2575 addr_type, addr_flags, sllao,
2576 tokenized, valid_lft,
2577 prefered_lft,
2578 dev_addr_generated);
2579 }
2580 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2581 put:
2582 in6_dev_put(in6_dev);
2583 }
2584
2585 /*
2586 * Set destination address.
2587 * Special case for SIT interfaces where we create a new "virtual"
2588 * device.
2589 */
2590 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2591 {
2592 struct in6_ifreq ireq;
2593 struct net_device *dev;
2594 int err = -EINVAL;
2595
2596 rtnl_lock();
2597
2598 err = -EFAULT;
2599 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2600 goto err_exit;
2601
2602 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2603
2604 err = -ENODEV;
2605 if (!dev)
2606 goto err_exit;
2607
2608 #if IS_ENABLED(CONFIG_IPV6_SIT)
2609 if (dev->type == ARPHRD_SIT) {
2610 const struct net_device_ops *ops = dev->netdev_ops;
2611 struct ifreq ifr;
2612 struct ip_tunnel_parm p;
2613
2614 err = -EADDRNOTAVAIL;
2615 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2616 goto err_exit;
2617
2618 memset(&p, 0, sizeof(p));
2619 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2620 p.iph.saddr = 0;
2621 p.iph.version = 4;
2622 p.iph.ihl = 5;
2623 p.iph.protocol = IPPROTO_IPV6;
2624 p.iph.ttl = 64;
2625 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2626
2627 if (ops->ndo_do_ioctl) {
2628 mm_segment_t oldfs = get_fs();
2629
2630 set_fs(KERNEL_DS);
2631 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2632 set_fs(oldfs);
2633 } else
2634 err = -EOPNOTSUPP;
2635
2636 if (err == 0) {
2637 err = -ENOBUFS;
2638 dev = __dev_get_by_name(net, p.name);
2639 if (!dev)
2640 goto err_exit;
2641 err = dev_open(dev);
2642 }
2643 }
2644 #endif
2645
2646 err_exit:
2647 rtnl_unlock();
2648 return err;
2649 }
2650
2651 static int ipv6_mc_config(struct sock *sk, bool join,
2652 const struct in6_addr *addr, int ifindex)
2653 {
2654 int ret;
2655
2656 ASSERT_RTNL();
2657
2658 lock_sock(sk);
2659 if (join)
2660 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2661 else
2662 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2663 release_sock(sk);
2664
2665 return ret;
2666 }
2667
2668 /*
2669 * Manual configuration of address on an interface
2670 */
2671 static int inet6_addr_add(struct net *net, int ifindex,
2672 const struct in6_addr *pfx,
2673 const struct in6_addr *peer_pfx,
2674 unsigned int plen, __u32 ifa_flags,
2675 __u32 prefered_lft, __u32 valid_lft)
2676 {
2677 struct inet6_ifaddr *ifp;
2678 struct inet6_dev *idev;
2679 struct net_device *dev;
2680 unsigned long timeout;
2681 clock_t expires;
2682 int scope;
2683 u32 flags;
2684
2685 ASSERT_RTNL();
2686
2687 if (plen > 128)
2688 return -EINVAL;
2689
2690 /* check the lifetime */
2691 if (!valid_lft || prefered_lft > valid_lft)
2692 return -EINVAL;
2693
2694 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2695 return -EINVAL;
2696
2697 dev = __dev_get_by_index(net, ifindex);
2698 if (!dev)
2699 return -ENODEV;
2700
2701 idev = addrconf_add_dev(dev);
2702 if (IS_ERR(idev))
2703 return PTR_ERR(idev);
2704
2705 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2706 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2707 true, pfx, ifindex);
2708
2709 if (ret < 0)
2710 return ret;
2711 }
2712
2713 scope = ipv6_addr_scope(pfx);
2714
2715 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2716 if (addrconf_finite_timeout(timeout)) {
2717 expires = jiffies_to_clock_t(timeout * HZ);
2718 valid_lft = timeout;
2719 flags = RTF_EXPIRES;
2720 } else {
2721 expires = 0;
2722 flags = 0;
2723 ifa_flags |= IFA_F_PERMANENT;
2724 }
2725
2726 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2727 if (addrconf_finite_timeout(timeout)) {
2728 if (timeout == 0)
2729 ifa_flags |= IFA_F_DEPRECATED;
2730 prefered_lft = timeout;
2731 }
2732
2733 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2734 valid_lft, prefered_lft);
2735
2736 if (!IS_ERR(ifp)) {
2737 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2738 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2739 expires, flags);
2740 }
2741
2742 /*
2743 * Note that section 3.1 of RFC 4429 indicates
2744 * that the Optimistic flag should not be set for
2745 * manually configured addresses
2746 */
2747 addrconf_dad_start(ifp);
2748 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2749 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2750 true, jiffies);
2751 in6_ifa_put(ifp);
2752 addrconf_verify_rtnl();
2753 return 0;
2754 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2755 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2756 false, pfx, ifindex);
2757 }
2758
2759 return PTR_ERR(ifp);
2760 }
2761
2762 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2763 const struct in6_addr *pfx, unsigned int plen)
2764 {
2765 struct inet6_ifaddr *ifp;
2766 struct inet6_dev *idev;
2767 struct net_device *dev;
2768
2769 if (plen > 128)
2770 return -EINVAL;
2771
2772 dev = __dev_get_by_index(net, ifindex);
2773 if (!dev)
2774 return -ENODEV;
2775
2776 idev = __in6_dev_get(dev);
2777 if (!idev)
2778 return -ENXIO;
2779
2780 read_lock_bh(&idev->lock);
2781 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2782 if (ifp->prefix_len == plen &&
2783 ipv6_addr_equal(pfx, &ifp->addr)) {
2784 in6_ifa_hold(ifp);
2785 read_unlock_bh(&idev->lock);
2786
2787 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2788 (ifa_flags & IFA_F_MANAGETEMPADDR))
2789 manage_tempaddrs(idev, ifp, 0, 0, false,
2790 jiffies);
2791 ipv6_del_addr(ifp);
2792 addrconf_verify_rtnl();
2793 if (ipv6_addr_is_multicast(pfx)) {
2794 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2795 false, pfx, dev->ifindex);
2796 }
2797 return 0;
2798 }
2799 }
2800 read_unlock_bh(&idev->lock);
2801 return -EADDRNOTAVAIL;
2802 }
2803
2804
2805 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2806 {
2807 struct in6_ifreq ireq;
2808 int err;
2809
2810 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2811 return -EPERM;
2812
2813 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2814 return -EFAULT;
2815
2816 rtnl_lock();
2817 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2818 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2819 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2820 rtnl_unlock();
2821 return err;
2822 }
2823
2824 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2825 {
2826 struct in6_ifreq ireq;
2827 int err;
2828
2829 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2830 return -EPERM;
2831
2832 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2833 return -EFAULT;
2834
2835 rtnl_lock();
2836 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2837 ireq.ifr6_prefixlen);
2838 rtnl_unlock();
2839 return err;
2840 }
2841
2842 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2843 int plen, int scope)
2844 {
2845 struct inet6_ifaddr *ifp;
2846
2847 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2848 scope, IFA_F_PERMANENT,
2849 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2850 if (!IS_ERR(ifp)) {
2851 spin_lock_bh(&ifp->lock);
2852 ifp->flags &= ~IFA_F_TENTATIVE;
2853 spin_unlock_bh(&ifp->lock);
2854 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2855 in6_ifa_put(ifp);
2856 }
2857 }
2858
2859 #if IS_ENABLED(CONFIG_IPV6_SIT)
2860 static void sit_add_v4_addrs(struct inet6_dev *idev)
2861 {
2862 struct in6_addr addr;
2863 struct net_device *dev;
2864 struct net *net = dev_net(idev->dev);
2865 int scope, plen;
2866 u32 pflags = 0;
2867
2868 ASSERT_RTNL();
2869
2870 memset(&addr, 0, sizeof(struct in6_addr));
2871 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2872
2873 if (idev->dev->flags&IFF_POINTOPOINT) {
2874 addr.s6_addr32[0] = htonl(0xfe800000);
2875 scope = IFA_LINK;
2876 plen = 64;
2877 } else {
2878 scope = IPV6_ADDR_COMPATv4;
2879 plen = 96;
2880 pflags |= RTF_NONEXTHOP;
2881 }
2882
2883 if (addr.s6_addr32[3]) {
2884 add_addr(idev, &addr, plen, scope);
2885 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2886 return;
2887 }
2888
2889 for_each_netdev(net, dev) {
2890 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2891 if (in_dev && (dev->flags & IFF_UP)) {
2892 struct in_ifaddr *ifa;
2893
2894 int flag = scope;
2895
2896 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2897
2898 addr.s6_addr32[3] = ifa->ifa_local;
2899
2900 if (ifa->ifa_scope == RT_SCOPE_LINK)
2901 continue;
2902 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2903 if (idev->dev->flags&IFF_POINTOPOINT)
2904 continue;
2905 flag |= IFA_HOST;
2906 }
2907
2908 add_addr(idev, &addr, plen, flag);
2909 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2910 pflags);
2911 }
2912 }
2913 }
2914 }
2915 #endif
2916
2917 static void init_loopback(struct net_device *dev)
2918 {
2919 struct inet6_dev *idev;
2920 struct net_device *sp_dev;
2921 struct inet6_ifaddr *sp_ifa;
2922 struct rt6_info *sp_rt;
2923
2924 /* ::1 */
2925
2926 ASSERT_RTNL();
2927
2928 idev = ipv6_find_idev(dev);
2929 if (!idev) {
2930 pr_debug("%s: add_dev failed\n", __func__);
2931 return;
2932 }
2933
2934 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2935
2936 /* Add routes to other interface's IPv6 addresses */
2937 for_each_netdev(dev_net(dev), sp_dev) {
2938 if (!strcmp(sp_dev->name, dev->name))
2939 continue;
2940
2941 idev = __in6_dev_get(sp_dev);
2942 if (!idev)
2943 continue;
2944
2945 read_lock_bh(&idev->lock);
2946 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2947
2948 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2949 continue;
2950
2951 if (sp_ifa->rt) {
2952 /* This dst has been added to garbage list when
2953 * lo device down, release this obsolete dst and
2954 * reallocate a new router for ifa.
2955 */
2956 if (sp_ifa->rt->dst.obsolete > 0) {
2957 ip6_rt_put(sp_ifa->rt);
2958 sp_ifa->rt = NULL;
2959 } else {
2960 continue;
2961 }
2962 }
2963
2964 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2965
2966 /* Failure cases are ignored */
2967 if (!IS_ERR(sp_rt)) {
2968 sp_ifa->rt = sp_rt;
2969 ip6_ins_rt(sp_rt);
2970 }
2971 }
2972 read_unlock_bh(&idev->lock);
2973 }
2974 }
2975
2976 void addrconf_add_linklocal(struct inet6_dev *idev,
2977 const struct in6_addr *addr, u32 flags)
2978 {
2979 struct inet6_ifaddr *ifp;
2980 u32 addr_flags = flags | IFA_F_PERMANENT;
2981
2982 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2983 if (idev->cnf.optimistic_dad &&
2984 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2985 addr_flags |= IFA_F_OPTIMISTIC;
2986 #endif
2987
2988 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2989 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2990 if (!IS_ERR(ifp)) {
2991 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2992 addrconf_dad_start(ifp);
2993 in6_ifa_put(ifp);
2994 }
2995 }
2996 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
2997
2998 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2999 {
3000 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3001 return true;
3002
3003 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3004 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3005 return true;
3006
3007 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3008 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3009 return true;
3010
3011 return false;
3012 }
3013
3014 static int ipv6_generate_stable_address(struct in6_addr *address,
3015 u8 dad_count,
3016 const struct inet6_dev *idev)
3017 {
3018 static DEFINE_SPINLOCK(lock);
3019 static __u32 digest[SHA_DIGEST_WORDS];
3020 static __u32 workspace[SHA_WORKSPACE_WORDS];
3021
3022 static union {
3023 char __data[SHA_MESSAGE_BYTES];
3024 struct {
3025 struct in6_addr secret;
3026 __be32 prefix[2];
3027 unsigned char hwaddr[MAX_ADDR_LEN];
3028 u8 dad_count;
3029 } __packed;
3030 } data;
3031
3032 struct in6_addr secret;
3033 struct in6_addr temp;
3034 struct net *net = dev_net(idev->dev);
3035
3036 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3037
3038 if (idev->cnf.stable_secret.initialized)
3039 secret = idev->cnf.stable_secret.secret;
3040 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3041 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3042 else
3043 return -1;
3044
3045 retry:
3046 spin_lock_bh(&lock);
3047
3048 sha_init(digest);
3049 memset(&data, 0, sizeof(data));
3050 memset(workspace, 0, sizeof(workspace));
3051 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3052 data.prefix[0] = address->s6_addr32[0];
3053 data.prefix[1] = address->s6_addr32[1];
3054 data.secret = secret;
3055 data.dad_count = dad_count;
3056
3057 sha_transform(digest, data.__data, workspace);
3058
3059 temp = *address;
3060 temp.s6_addr32[2] = (__force __be32)digest[0];
3061 temp.s6_addr32[3] = (__force __be32)digest[1];
3062
3063 spin_unlock_bh(&lock);
3064
3065 if (ipv6_reserved_interfaceid(temp)) {
3066 dad_count++;
3067 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3068 return -1;
3069 goto retry;
3070 }
3071
3072 *address = temp;
3073 return 0;
3074 }
3075
3076 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3077 {
3078 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3079
3080 if (s->initialized)
3081 return;
3082 s = &idev->cnf.stable_secret;
3083 get_random_bytes(&s->secret, sizeof(s->secret));
3084 s->initialized = true;
3085 }
3086
3087 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3088 {
3089 struct in6_addr addr;
3090
3091 /* no link local addresses on L3 master devices */
3092 if (netif_is_l3_master(idev->dev))
3093 return;
3094
3095 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3096
3097 switch (idev->addr_gen_mode) {
3098 case IN6_ADDR_GEN_MODE_RANDOM:
3099 ipv6_gen_mode_random_init(idev);
3100 /* fallthrough */
3101 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3102 if (!ipv6_generate_stable_address(&addr, 0, idev))
3103 addrconf_add_linklocal(idev, &addr,
3104 IFA_F_STABLE_PRIVACY);
3105 else if (prefix_route)
3106 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3107 break;
3108 case IN6_ADDR_GEN_MODE_EUI64:
3109 /* addrconf_add_linklocal also adds a prefix_route and we
3110 * only need to care about prefix routes if ipv6_generate_eui64
3111 * couldn't generate one.
3112 */
3113 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3114 addrconf_add_linklocal(idev, &addr, 0);
3115 else if (prefix_route)
3116 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3117 break;
3118 case IN6_ADDR_GEN_MODE_NONE:
3119 default:
3120 /* will not add any link local address */
3121 break;
3122 }
3123 }
3124
3125 static void addrconf_dev_config(struct net_device *dev)
3126 {
3127 struct inet6_dev *idev;
3128
3129 ASSERT_RTNL();
3130
3131 if ((dev->type != ARPHRD_ETHER) &&
3132 (dev->type != ARPHRD_FDDI) &&
3133 (dev->type != ARPHRD_ARCNET) &&
3134 (dev->type != ARPHRD_INFINIBAND) &&
3135 (dev->type != ARPHRD_IEEE1394) &&
3136 (dev->type != ARPHRD_TUNNEL6) &&
3137 (dev->type != ARPHRD_6LOWPAN) &&
3138 (dev->type != ARPHRD_NONE)) {
3139 /* Alas, we support only Ethernet autoconfiguration. */
3140 return;
3141 }
3142
3143 idev = addrconf_add_dev(dev);
3144 if (IS_ERR(idev))
3145 return;
3146
3147 /* this device type has no EUI support */
3148 if (dev->type == ARPHRD_NONE &&
3149 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3150 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3151
3152 addrconf_addr_gen(idev, false);
3153 }
3154
3155 #if IS_ENABLED(CONFIG_IPV6_SIT)
3156 static void addrconf_sit_config(struct net_device *dev)
3157 {
3158 struct inet6_dev *idev;
3159
3160 ASSERT_RTNL();
3161
3162 /*
3163 * Configure the tunnel with one of our IPv4
3164 * addresses... we should configure all of
3165 * our v4 addrs in the tunnel
3166 */
3167
3168 idev = ipv6_find_idev(dev);
3169 if (!idev) {
3170 pr_debug("%s: add_dev failed\n", __func__);
3171 return;
3172 }
3173
3174 if (dev->priv_flags & IFF_ISATAP) {
3175 addrconf_addr_gen(idev, false);
3176 return;
3177 }
3178
3179 sit_add_v4_addrs(idev);
3180
3181 if (dev->flags&IFF_POINTOPOINT)
3182 addrconf_add_mroute(dev);
3183 }
3184 #endif
3185
3186 #if IS_ENABLED(CONFIG_NET_IPGRE)
3187 static void addrconf_gre_config(struct net_device *dev)
3188 {
3189 struct inet6_dev *idev;
3190
3191 ASSERT_RTNL();
3192
3193 idev = ipv6_find_idev(dev);
3194 if (!idev) {
3195 pr_debug("%s: add_dev failed\n", __func__);
3196 return;
3197 }
3198
3199 addrconf_addr_gen(idev, true);
3200 if (dev->flags & IFF_POINTOPOINT)
3201 addrconf_add_mroute(dev);
3202 }
3203 #endif
3204
3205 static int fixup_permanent_addr(struct inet6_dev *idev,
3206 struct inet6_ifaddr *ifp)
3207 {
3208 if (!ifp->rt) {
3209 struct rt6_info *rt;
3210
3211 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3212 if (unlikely(IS_ERR(rt)))
3213 return PTR_ERR(rt);
3214
3215 ifp->rt = rt;
3216 }
3217
3218 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3219 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3220 idev->dev, 0, 0);
3221 }
3222
3223 addrconf_dad_start(ifp);
3224
3225 return 0;
3226 }
3227
3228 static void addrconf_permanent_addr(struct net_device *dev)
3229 {
3230 struct inet6_ifaddr *ifp, *tmp;
3231 struct inet6_dev *idev;
3232
3233 idev = __in6_dev_get(dev);
3234 if (!idev)
3235 return;
3236
3237 write_lock_bh(&idev->lock);
3238
3239 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3240 if ((ifp->flags & IFA_F_PERMANENT) &&
3241 fixup_permanent_addr(idev, ifp) < 0) {
3242 write_unlock_bh(&idev->lock);
3243 ipv6_del_addr(ifp);
3244 write_lock_bh(&idev->lock);
3245
3246 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3247 idev->dev->name, &ifp->addr);
3248 }
3249 }
3250
3251 write_unlock_bh(&idev->lock);
3252 }
3253
3254 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3255 void *ptr)
3256 {
3257 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3258 struct netdev_notifier_changeupper_info *info;
3259 struct inet6_dev *idev = __in6_dev_get(dev);
3260 int run_pending = 0;
3261 int err;
3262
3263 switch (event) {
3264 case NETDEV_REGISTER:
3265 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3266 idev = ipv6_add_dev(dev);
3267 if (IS_ERR(idev))
3268 return notifier_from_errno(PTR_ERR(idev));
3269 }
3270 break;
3271
3272 case NETDEV_CHANGEMTU:
3273 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3274 if (dev->mtu < IPV6_MIN_MTU) {
3275 addrconf_ifdown(dev, 1);
3276 break;
3277 }
3278
3279 if (idev) {
3280 rt6_mtu_change(dev, dev->mtu);
3281 idev->cnf.mtu6 = dev->mtu;
3282 break;
3283 }
3284
3285 /* allocate new idev */
3286 idev = ipv6_add_dev(dev);
3287 if (IS_ERR(idev))
3288 break;
3289
3290 /* device is still not ready */
3291 if (!(idev->if_flags & IF_READY))
3292 break;
3293
3294 run_pending = 1;
3295
3296 /* fall through */
3297
3298 case NETDEV_UP:
3299 case NETDEV_CHANGE:
3300 if (dev->flags & IFF_SLAVE)
3301 break;
3302
3303 if (idev && idev->cnf.disable_ipv6)
3304 break;
3305
3306 if (event == NETDEV_UP) {
3307 /* restore routes for permanent addresses */
3308 addrconf_permanent_addr(dev);
3309
3310 if (!addrconf_qdisc_ok(dev)) {
3311 /* device is not ready yet. */
3312 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3313 dev->name);
3314 break;
3315 }
3316
3317 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3318 idev = ipv6_add_dev(dev);
3319
3320 if (!IS_ERR_OR_NULL(idev)) {
3321 idev->if_flags |= IF_READY;
3322 run_pending = 1;
3323 }
3324 } else if (event == NETDEV_CHANGE) {
3325 if (!addrconf_qdisc_ok(dev)) {
3326 /* device is still not ready. */
3327 break;
3328 }
3329
3330 if (idev) {
3331 if (idev->if_flags & IF_READY)
3332 /* device is already configured. */
3333 break;
3334 idev->if_flags |= IF_READY;
3335 }
3336
3337 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3338 dev->name);
3339
3340 run_pending = 1;
3341 }
3342
3343 switch (dev->type) {
3344 #if IS_ENABLED(CONFIG_IPV6_SIT)
3345 case ARPHRD_SIT:
3346 addrconf_sit_config(dev);
3347 break;
3348 #endif
3349 #if IS_ENABLED(CONFIG_NET_IPGRE)
3350 case ARPHRD_IPGRE:
3351 addrconf_gre_config(dev);
3352 break;
3353 #endif
3354 case ARPHRD_LOOPBACK:
3355 init_loopback(dev);
3356 break;
3357
3358 default:
3359 addrconf_dev_config(dev);
3360 break;
3361 }
3362
3363 if (!IS_ERR_OR_NULL(idev)) {
3364 if (run_pending)
3365 addrconf_dad_run(idev);
3366
3367 /*
3368 * If the MTU changed during the interface down,
3369 * when the interface up, the changed MTU must be
3370 * reflected in the idev as well as routers.
3371 */
3372 if (idev->cnf.mtu6 != dev->mtu &&
3373 dev->mtu >= IPV6_MIN_MTU) {
3374 rt6_mtu_change(dev, dev->mtu);
3375 idev->cnf.mtu6 = dev->mtu;
3376 }
3377 idev->tstamp = jiffies;
3378 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3379
3380 /*
3381 * If the changed mtu during down is lower than
3382 * IPV6_MIN_MTU stop IPv6 on this interface.
3383 */
3384 if (dev->mtu < IPV6_MIN_MTU)
3385 addrconf_ifdown(dev, 1);
3386 }
3387 break;
3388
3389 case NETDEV_DOWN:
3390 case NETDEV_UNREGISTER:
3391 /*
3392 * Remove all addresses from this interface.
3393 */
3394 addrconf_ifdown(dev, event != NETDEV_DOWN);
3395 break;
3396
3397 case NETDEV_CHANGENAME:
3398 if (idev) {
3399 snmp6_unregister_dev(idev);
3400 addrconf_sysctl_unregister(idev);
3401 err = addrconf_sysctl_register(idev);
3402 if (err)
3403 return notifier_from_errno(err);
3404 err = snmp6_register_dev(idev);
3405 if (err) {
3406 addrconf_sysctl_unregister(idev);
3407 return notifier_from_errno(err);
3408 }
3409 }
3410 break;
3411
3412 case NETDEV_PRE_TYPE_CHANGE:
3413 case NETDEV_POST_TYPE_CHANGE:
3414 if (idev)
3415 addrconf_type_change(dev, event);
3416 break;
3417
3418 case NETDEV_CHANGEUPPER:
3419 info = ptr;
3420
3421 /* flush all routes if dev is linked to or unlinked from
3422 * an L3 master device (e.g., VRF)
3423 */
3424 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3425 addrconf_ifdown(dev, 0);
3426 }
3427
3428 return NOTIFY_OK;
3429 }
3430
3431 /*
3432 * addrconf module should be notified of a device going up
3433 */
3434 static struct notifier_block ipv6_dev_notf = {
3435 .notifier_call = addrconf_notify,
3436 };
3437
3438 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3439 {
3440 struct inet6_dev *idev;
3441 ASSERT_RTNL();
3442
3443 idev = __in6_dev_get(dev);
3444
3445 if (event == NETDEV_POST_TYPE_CHANGE)
3446 ipv6_mc_remap(idev);
3447 else if (event == NETDEV_PRE_TYPE_CHANGE)
3448 ipv6_mc_unmap(idev);
3449 }
3450
3451 static bool addr_is_local(const struct in6_addr *addr)
3452 {
3453 return ipv6_addr_type(addr) &
3454 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3455 }
3456
3457 static int addrconf_ifdown(struct net_device *dev, int how)
3458 {
3459 struct net *net = dev_net(dev);
3460 struct inet6_dev *idev;
3461 struct inet6_ifaddr *ifa, *tmp;
3462 struct list_head del_list;
3463 int _keep_addr;
3464 bool keep_addr;
3465 int state, i;
3466
3467 ASSERT_RTNL();
3468
3469 rt6_ifdown(net, dev);
3470 neigh_ifdown(&nd_tbl, dev);
3471
3472 idev = __in6_dev_get(dev);
3473 if (!idev)
3474 return -ENODEV;
3475
3476 /*
3477 * Step 1: remove reference to ipv6 device from parent device.
3478 * Do not dev_put!
3479 */
3480 if (how) {
3481 idev->dead = 1;
3482
3483 /* protected by rtnl_lock */
3484 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3485
3486 /* Step 1.5: remove snmp6 entry */
3487 snmp6_unregister_dev(idev);
3488
3489 }
3490
3491 /* aggregate the system setting and interface setting */
3492 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3493 if (!_keep_addr)
3494 _keep_addr = idev->cnf.keep_addr_on_down;
3495
3496 /* combine the user config with event to determine if permanent
3497 * addresses are to be removed from address hash table
3498 */
3499 keep_addr = !(how || _keep_addr <= 0);
3500
3501 /* Step 2: clear hash table */
3502 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3503 struct hlist_head *h = &inet6_addr_lst[i];
3504
3505 spin_lock_bh(&addrconf_hash_lock);
3506 restart:
3507 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3508 if (ifa->idev == idev) {
3509 addrconf_del_dad_work(ifa);
3510 /* combined flag + permanent flag decide if
3511 * address is retained on a down event
3512 */
3513 if (!keep_addr ||
3514 !(ifa->flags & IFA_F_PERMANENT) ||
3515 addr_is_local(&ifa->addr)) {
3516 hlist_del_init_rcu(&ifa->addr_lst);
3517 goto restart;
3518 }
3519 }
3520 }
3521 spin_unlock_bh(&addrconf_hash_lock);
3522 }
3523
3524 write_lock_bh(&idev->lock);
3525
3526 addrconf_del_rs_timer(idev);
3527
3528 /* Step 2: clear flags for stateless addrconf */
3529 if (!how)
3530 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3531
3532 if (how && del_timer(&idev->regen_timer))
3533 in6_dev_put(idev);
3534
3535 /* Step 3: clear tempaddr list */
3536 while (!list_empty(&idev->tempaddr_list)) {
3537 ifa = list_first_entry(&idev->tempaddr_list,
3538 struct inet6_ifaddr, tmp_list);
3539 list_del(&ifa->tmp_list);
3540 write_unlock_bh(&idev->lock);
3541 spin_lock_bh(&ifa->lock);
3542
3543 if (ifa->ifpub) {
3544 in6_ifa_put(ifa->ifpub);
3545 ifa->ifpub = NULL;
3546 }
3547 spin_unlock_bh(&ifa->lock);
3548 in6_ifa_put(ifa);
3549 write_lock_bh(&idev->lock);
3550 }
3551
3552 /* re-combine the user config with event to determine if permanent
3553 * addresses are to be removed from the interface list
3554 */
3555 keep_addr = (!how && _keep_addr > 0);
3556
3557 INIT_LIST_HEAD(&del_list);
3558 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3559 struct rt6_info *rt = NULL;
3560
3561 addrconf_del_dad_work(ifa);
3562
3563 write_unlock_bh(&idev->lock);
3564 spin_lock_bh(&ifa->lock);
3565
3566 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3567 !addr_is_local(&ifa->addr)) {
3568 /* set state to skip the notifier below */
3569 state = INET6_IFADDR_STATE_DEAD;
3570 ifa->state = 0;
3571 if (!(ifa->flags & IFA_F_NODAD))
3572 ifa->flags |= IFA_F_TENTATIVE;
3573
3574 rt = ifa->rt;
3575 ifa->rt = NULL;
3576 } else {
3577 state = ifa->state;
3578 ifa->state = INET6_IFADDR_STATE_DEAD;
3579
3580 list_del(&ifa->if_list);
3581 list_add(&ifa->if_list, &del_list);
3582 }
3583
3584 spin_unlock_bh(&ifa->lock);
3585
3586 if (rt)
3587 ip6_del_rt(rt);
3588
3589 if (state != INET6_IFADDR_STATE_DEAD) {
3590 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3591 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3592 }
3593
3594 write_lock_bh(&idev->lock);
3595 }
3596
3597 write_unlock_bh(&idev->lock);
3598
3599 /* now clean up addresses to be removed */
3600 while (!list_empty(&del_list)) {
3601 ifa = list_first_entry(&del_list,
3602 struct inet6_ifaddr, if_list);
3603 list_del(&ifa->if_list);
3604
3605 in6_ifa_put(ifa);
3606 }
3607
3608 /* Step 5: Discard anycast and multicast list */
3609 if (how) {
3610 ipv6_ac_destroy_dev(idev);
3611 ipv6_mc_destroy_dev(idev);
3612 } else {
3613 ipv6_mc_down(idev);
3614 }
3615
3616 idev->tstamp = jiffies;
3617
3618 /* Last: Shot the device (if unregistered) */
3619 if (how) {
3620 addrconf_sysctl_unregister(idev);
3621 neigh_parms_release(&nd_tbl, idev->nd_parms);
3622 neigh_ifdown(&nd_tbl, dev);
3623 in6_dev_put(idev);
3624 }
3625 return 0;
3626 }
3627
3628 static void addrconf_rs_timer(unsigned long data)
3629 {
3630 struct inet6_dev *idev = (struct inet6_dev *)data;
3631 struct net_device *dev = idev->dev;
3632 struct in6_addr lladdr;
3633
3634 write_lock(&idev->lock);
3635 if (idev->dead || !(idev->if_flags & IF_READY))
3636 goto out;
3637
3638 if (!ipv6_accept_ra(idev))
3639 goto out;
3640
3641 /* Announcement received after solicitation was sent */
3642 if (idev->if_flags & IF_RA_RCVD)
3643 goto out;
3644
3645 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3646 write_unlock(&idev->lock);
3647 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3648 ndisc_send_rs(dev, &lladdr,
3649 &in6addr_linklocal_allrouters);
3650 else
3651 goto put;
3652
3653 write_lock(&idev->lock);
3654 /* The wait after the last probe can be shorter */
3655 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3656 idev->cnf.rtr_solicits) ?
3657 idev->cnf.rtr_solicit_delay :
3658 idev->cnf.rtr_solicit_interval);
3659 } else {
3660 /*
3661 * Note: we do not support deprecated "all on-link"
3662 * assumption any longer.
3663 */
3664 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3665 }
3666
3667 out:
3668 write_unlock(&idev->lock);
3669 put:
3670 in6_dev_put(idev);
3671 }
3672
3673 /*
3674 * Duplicate Address Detection
3675 */
3676 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3677 {
3678 unsigned long rand_num;
3679 struct inet6_dev *idev = ifp->idev;
3680
3681 if (ifp->flags & IFA_F_OPTIMISTIC)
3682 rand_num = 0;
3683 else
3684 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3685
3686 ifp->dad_probes = idev->cnf.dad_transmits;
3687 addrconf_mod_dad_work(ifp, rand_num);
3688 }
3689
3690 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3691 {
3692 struct inet6_dev *idev = ifp->idev;
3693 struct net_device *dev = idev->dev;
3694 bool notify = false;
3695
3696 addrconf_join_solict(dev, &ifp->addr);
3697
3698 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3699
3700 read_lock_bh(&idev->lock);
3701 spin_lock(&ifp->lock);
3702 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3703 goto out;
3704
3705 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3706 idev->cnf.accept_dad < 1 ||
3707 !(ifp->flags&IFA_F_TENTATIVE) ||
3708 ifp->flags & IFA_F_NODAD) {
3709 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3710 spin_unlock(&ifp->lock);
3711 read_unlock_bh(&idev->lock);
3712
3713 addrconf_dad_completed(ifp);
3714 return;
3715 }
3716
3717 if (!(idev->if_flags & IF_READY)) {
3718 spin_unlock(&ifp->lock);
3719 read_unlock_bh(&idev->lock);
3720 /*
3721 * If the device is not ready:
3722 * - keep it tentative if it is a permanent address.
3723 * - otherwise, kill it.
3724 */
3725 in6_ifa_hold(ifp);
3726 addrconf_dad_stop(ifp, 0);
3727 return;
3728 }
3729
3730 /*
3731 * Optimistic nodes can start receiving
3732 * Frames right away
3733 */
3734 if (ifp->flags & IFA_F_OPTIMISTIC) {
3735 ip6_ins_rt(ifp->rt);
3736 if (ipv6_use_optimistic_addr(idev)) {
3737 /* Because optimistic nodes can use this address,
3738 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3739 */
3740 notify = true;
3741 }
3742 }
3743
3744 addrconf_dad_kick(ifp);
3745 out:
3746 spin_unlock(&ifp->lock);
3747 read_unlock_bh(&idev->lock);
3748 if (notify)
3749 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3750 }
3751
3752 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3753 {
3754 bool begin_dad = false;
3755
3756 spin_lock_bh(&ifp->lock);
3757 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3758 ifp->state = INET6_IFADDR_STATE_PREDAD;
3759 begin_dad = true;
3760 }
3761 spin_unlock_bh(&ifp->lock);
3762
3763 if (begin_dad)
3764 addrconf_mod_dad_work(ifp, 0);
3765 }
3766
3767 static void addrconf_dad_work(struct work_struct *w)
3768 {
3769 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3770 struct inet6_ifaddr,
3771 dad_work);
3772 struct inet6_dev *idev = ifp->idev;
3773 struct in6_addr mcaddr;
3774
3775 enum {
3776 DAD_PROCESS,
3777 DAD_BEGIN,
3778 DAD_ABORT,
3779 } action = DAD_PROCESS;
3780
3781 rtnl_lock();
3782
3783 spin_lock_bh(&ifp->lock);
3784 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3785 action = DAD_BEGIN;
3786 ifp->state = INET6_IFADDR_STATE_DAD;
3787 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3788 action = DAD_ABORT;
3789 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3790 }
3791 spin_unlock_bh(&ifp->lock);
3792
3793 if (action == DAD_BEGIN) {
3794 addrconf_dad_begin(ifp);
3795 goto out;
3796 } else if (action == DAD_ABORT) {
3797 addrconf_dad_stop(ifp, 1);
3798 goto out;
3799 }
3800
3801 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3802 goto out;
3803
3804 write_lock_bh(&idev->lock);
3805 if (idev->dead || !(idev->if_flags & IF_READY)) {
3806 write_unlock_bh(&idev->lock);
3807 goto out;
3808 }
3809
3810 spin_lock(&ifp->lock);
3811 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3812 spin_unlock(&ifp->lock);
3813 write_unlock_bh(&idev->lock);
3814 goto out;
3815 }
3816
3817 if (ifp->dad_probes == 0) {
3818 /*
3819 * DAD was successful
3820 */
3821
3822 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3823 spin_unlock(&ifp->lock);
3824 write_unlock_bh(&idev->lock);
3825
3826 addrconf_dad_completed(ifp);
3827
3828 goto out;
3829 }
3830
3831 ifp->dad_probes--;
3832 addrconf_mod_dad_work(ifp,
3833 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3834 spin_unlock(&ifp->lock);
3835 write_unlock_bh(&idev->lock);
3836
3837 /* send a neighbour solicitation for our addr */
3838 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3839 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3840 out:
3841 in6_ifa_put(ifp);
3842 rtnl_unlock();
3843 }
3844
3845 /* ifp->idev must be at least read locked */
3846 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3847 {
3848 struct inet6_ifaddr *ifpiter;
3849 struct inet6_dev *idev = ifp->idev;
3850
3851 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3852 if (ifpiter->scope > IFA_LINK)
3853 break;
3854 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3855 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3856 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3857 IFA_F_PERMANENT)
3858 return false;
3859 }
3860 return true;
3861 }
3862
3863 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3864 {
3865 struct net_device *dev = ifp->idev->dev;
3866 struct in6_addr lladdr;
3867 bool send_rs, send_mld;
3868
3869 addrconf_del_dad_work(ifp);
3870
3871 /*
3872 * Configure the address for reception. Now it is valid.
3873 */
3874
3875 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3876
3877 /* If added prefix is link local and we are prepared to process
3878 router advertisements, start sending router solicitations.
3879 */
3880
3881 read_lock_bh(&ifp->idev->lock);
3882 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3883 send_rs = send_mld &&
3884 ipv6_accept_ra(ifp->idev) &&
3885 ifp->idev->cnf.rtr_solicits > 0 &&
3886 (dev->flags&IFF_LOOPBACK) == 0;
3887 read_unlock_bh(&ifp->idev->lock);
3888
3889 /* While dad is in progress mld report's source address is in6_addrany.
3890 * Resend with proper ll now.
3891 */
3892 if (send_mld)
3893 ipv6_mc_dad_complete(ifp->idev);
3894
3895 if (send_rs) {
3896 /*
3897 * If a host as already performed a random delay
3898 * [...] as part of DAD [...] there is no need
3899 * to delay again before sending the first RS
3900 */
3901 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3902 return;
3903 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3904
3905 write_lock_bh(&ifp->idev->lock);
3906 spin_lock(&ifp->lock);
3907 ifp->idev->rs_probes = 1;
3908 ifp->idev->if_flags |= IF_RS_SENT;
3909 addrconf_mod_rs_timer(ifp->idev,
3910 ifp->idev->cnf.rtr_solicit_interval);
3911 spin_unlock(&ifp->lock);
3912 write_unlock_bh(&ifp->idev->lock);
3913 }
3914 }
3915
3916 static void addrconf_dad_run(struct inet6_dev *idev)
3917 {
3918 struct inet6_ifaddr *ifp;
3919
3920 read_lock_bh(&idev->lock);
3921 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3922 spin_lock(&ifp->lock);
3923 if (ifp->flags & IFA_F_TENTATIVE &&
3924 ifp->state == INET6_IFADDR_STATE_DAD)
3925 addrconf_dad_kick(ifp);
3926 spin_unlock(&ifp->lock);
3927 }
3928 read_unlock_bh(&idev->lock);
3929 }
3930
3931 #ifdef CONFIG_PROC_FS
3932 struct if6_iter_state {
3933 struct seq_net_private p;
3934 int bucket;
3935 int offset;
3936 };
3937
3938 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3939 {
3940 struct inet6_ifaddr *ifa = NULL;
3941 struct if6_iter_state *state = seq->private;
3942 struct net *net = seq_file_net(seq);
3943 int p = 0;
3944
3945 /* initial bucket if pos is 0 */
3946 if (pos == 0) {
3947 state->bucket = 0;
3948 state->offset = 0;
3949 }
3950
3951 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3952 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3953 addr_lst) {
3954 if (!net_eq(dev_net(ifa->idev->dev), net))
3955 continue;
3956 /* sync with offset */
3957 if (p < state->offset) {
3958 p++;
3959 continue;
3960 }
3961 state->offset++;
3962 return ifa;
3963 }
3964
3965 /* prepare for next bucket */
3966 state->offset = 0;
3967 p = 0;
3968 }
3969 return NULL;
3970 }
3971
3972 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3973 struct inet6_ifaddr *ifa)
3974 {
3975 struct if6_iter_state *state = seq->private;
3976 struct net *net = seq_file_net(seq);
3977
3978 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3979 if (!net_eq(dev_net(ifa->idev->dev), net))
3980 continue;
3981 state->offset++;
3982 return ifa;
3983 }
3984
3985 while (++state->bucket < IN6_ADDR_HSIZE) {
3986 state->offset = 0;
3987 hlist_for_each_entry_rcu_bh(ifa,
3988 &inet6_addr_lst[state->bucket], addr_lst) {
3989 if (!net_eq(dev_net(ifa->idev->dev), net))
3990 continue;
3991 state->offset++;
3992 return ifa;
3993 }
3994 }
3995
3996 return NULL;
3997 }
3998
3999 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4000 __acquires(rcu_bh)
4001 {
4002 rcu_read_lock_bh();
4003 return if6_get_first(seq, *pos);
4004 }
4005
4006 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4007 {
4008 struct inet6_ifaddr *ifa;
4009
4010 ifa = if6_get_next(seq, v);
4011 ++*pos;
4012 return ifa;
4013 }
4014
4015 static void if6_seq_stop(struct seq_file *seq, void *v)
4016 __releases(rcu_bh)
4017 {
4018 rcu_read_unlock_bh();
4019 }
4020
4021 static int if6_seq_show(struct seq_file *seq, void *v)
4022 {
4023 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4024 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4025 &ifp->addr,
4026 ifp->idev->dev->ifindex,
4027 ifp->prefix_len,
4028 ifp->scope,
4029 (u8) ifp->flags,
4030 ifp->idev->dev->name);
4031 return 0;
4032 }
4033
4034 static const struct seq_operations if6_seq_ops = {
4035 .start = if6_seq_start,
4036 .next = if6_seq_next,
4037 .show = if6_seq_show,
4038 .stop = if6_seq_stop,
4039 };
4040
4041 static int if6_seq_open(struct inode *inode, struct file *file)
4042 {
4043 return seq_open_net(inode, file, &if6_seq_ops,
4044 sizeof(struct if6_iter_state));
4045 }
4046
4047 static const struct file_operations if6_fops = {
4048 .owner = THIS_MODULE,
4049 .open = if6_seq_open,
4050 .read = seq_read,
4051 .llseek = seq_lseek,
4052 .release = seq_release_net,
4053 };
4054
4055 static int __net_init if6_proc_net_init(struct net *net)
4056 {
4057 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4058 return -ENOMEM;
4059 return 0;
4060 }
4061
4062 static void __net_exit if6_proc_net_exit(struct net *net)
4063 {
4064 remove_proc_entry("if_inet6", net->proc_net);
4065 }
4066
4067 static struct pernet_operations if6_proc_net_ops = {
4068 .init = if6_proc_net_init,
4069 .exit = if6_proc_net_exit,
4070 };
4071
4072 int __init if6_proc_init(void)
4073 {
4074 return register_pernet_subsys(&if6_proc_net_ops);
4075 }
4076
4077 void if6_proc_exit(void)
4078 {
4079 unregister_pernet_subsys(&if6_proc_net_ops);
4080 }
4081 #endif /* CONFIG_PROC_FS */
4082
4083 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4084 /* Check if address is a home address configured on any interface. */
4085 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4086 {
4087 int ret = 0;
4088 struct inet6_ifaddr *ifp = NULL;
4089 unsigned int hash = inet6_addr_hash(addr);
4090
4091 rcu_read_lock_bh();
4092 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4093 if (!net_eq(dev_net(ifp->idev->dev), net))
4094 continue;
4095 if (ipv6_addr_equal(&ifp->addr, addr) &&
4096 (ifp->flags & IFA_F_HOMEADDRESS)) {
4097 ret = 1;
4098 break;
4099 }
4100 }
4101 rcu_read_unlock_bh();
4102 return ret;
4103 }
4104 #endif
4105
4106 /*
4107 * Periodic address status verification
4108 */
4109
4110 static void addrconf_verify_rtnl(void)
4111 {
4112 unsigned long now, next, next_sec, next_sched;
4113 struct inet6_ifaddr *ifp;
4114 int i;
4115
4116 ASSERT_RTNL();
4117
4118 rcu_read_lock_bh();
4119 now = jiffies;
4120 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4121
4122 cancel_delayed_work(&addr_chk_work);
4123
4124 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4125 restart:
4126 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4127 unsigned long age;
4128
4129 /* When setting preferred_lft to a value not zero or
4130 * infinity, while valid_lft is infinity
4131 * IFA_F_PERMANENT has a non-infinity life time.
4132 */
4133 if ((ifp->flags & IFA_F_PERMANENT) &&
4134 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4135 continue;
4136
4137 spin_lock(&ifp->lock);
4138 /* We try to batch several events at once. */
4139 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4140
4141 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4142 age >= ifp->valid_lft) {
4143 spin_unlock(&ifp->lock);
4144 in6_ifa_hold(ifp);
4145 ipv6_del_addr(ifp);
4146 goto restart;
4147 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4148 spin_unlock(&ifp->lock);
4149 continue;
4150 } else if (age >= ifp->prefered_lft) {
4151 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4152 int deprecate = 0;
4153
4154 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4155 deprecate = 1;
4156 ifp->flags |= IFA_F_DEPRECATED;
4157 }
4158
4159 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4160 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4161 next = ifp->tstamp + ifp->valid_lft * HZ;
4162
4163 spin_unlock(&ifp->lock);
4164
4165 if (deprecate) {
4166 in6_ifa_hold(ifp);
4167
4168 ipv6_ifa_notify(0, ifp);
4169 in6_ifa_put(ifp);
4170 goto restart;
4171 }
4172 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4173 !(ifp->flags&IFA_F_TENTATIVE)) {
4174 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4175 ifp->idev->cnf.dad_transmits *
4176 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4177
4178 if (age >= ifp->prefered_lft - regen_advance) {
4179 struct inet6_ifaddr *ifpub = ifp->ifpub;
4180 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4181 next = ifp->tstamp + ifp->prefered_lft * HZ;
4182 if (!ifp->regen_count && ifpub) {
4183 ifp->regen_count++;
4184 in6_ifa_hold(ifp);
4185 in6_ifa_hold(ifpub);
4186 spin_unlock(&ifp->lock);
4187
4188 spin_lock(&ifpub->lock);
4189 ifpub->regen_count = 0;
4190 spin_unlock(&ifpub->lock);
4191 ipv6_create_tempaddr(ifpub, ifp);
4192 in6_ifa_put(ifpub);
4193 in6_ifa_put(ifp);
4194 goto restart;
4195 }
4196 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4197 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4198 spin_unlock(&ifp->lock);
4199 } else {
4200 /* ifp->prefered_lft <= ifp->valid_lft */
4201 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4202 next = ifp->tstamp + ifp->prefered_lft * HZ;
4203 spin_unlock(&ifp->lock);
4204 }
4205 }
4206 }
4207
4208 next_sec = round_jiffies_up(next);
4209 next_sched = next;
4210
4211 /* If rounded timeout is accurate enough, accept it. */
4212 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4213 next_sched = next_sec;
4214
4215 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4216 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4217 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4218
4219 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4220 now, next, next_sec, next_sched);
4221 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4222 rcu_read_unlock_bh();
4223 }
4224
4225 static void addrconf_verify_work(struct work_struct *w)
4226 {
4227 rtnl_lock();
4228 addrconf_verify_rtnl();
4229 rtnl_unlock();
4230 }
4231
4232 static void addrconf_verify(void)
4233 {
4234 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4235 }
4236
4237 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4238 struct in6_addr **peer_pfx)
4239 {
4240 struct in6_addr *pfx = NULL;
4241
4242 *peer_pfx = NULL;
4243
4244 if (addr)
4245 pfx = nla_data(addr);
4246
4247 if (local) {
4248 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4249 *peer_pfx = pfx;
4250 pfx = nla_data(local);
4251 }
4252
4253 return pfx;
4254 }
4255
4256 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4257 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4258 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4259 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4260 [IFA_FLAGS] = { .len = sizeof(u32) },
4261 };
4262
4263 static int
4264 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4265 {
4266 struct net *net = sock_net(skb->sk);
4267 struct ifaddrmsg *ifm;
4268 struct nlattr *tb[IFA_MAX+1];
4269 struct in6_addr *pfx, *peer_pfx;
4270 u32 ifa_flags;
4271 int err;
4272
4273 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4274 if (err < 0)
4275 return err;
4276
4277 ifm = nlmsg_data(nlh);
4278 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4279 if (!pfx)
4280 return -EINVAL;
4281
4282 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4283
4284 /* We ignore other flags so far. */
4285 ifa_flags &= IFA_F_MANAGETEMPADDR;
4286
4287 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4288 ifm->ifa_prefixlen);
4289 }
4290
4291 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4292 u32 prefered_lft, u32 valid_lft)
4293 {
4294 u32 flags;
4295 clock_t expires;
4296 unsigned long timeout;
4297 bool was_managetempaddr;
4298 bool had_prefixroute;
4299
4300 ASSERT_RTNL();
4301
4302 if (!valid_lft || (prefered_lft > valid_lft))
4303 return -EINVAL;
4304
4305 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4306 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4307 return -EINVAL;
4308
4309 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4310 if (addrconf_finite_timeout(timeout)) {
4311 expires = jiffies_to_clock_t(timeout * HZ);
4312 valid_lft = timeout;
4313 flags = RTF_EXPIRES;
4314 } else {
4315 expires = 0;
4316 flags = 0;
4317 ifa_flags |= IFA_F_PERMANENT;
4318 }
4319
4320 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4321 if (addrconf_finite_timeout(timeout)) {
4322 if (timeout == 0)
4323 ifa_flags |= IFA_F_DEPRECATED;
4324 prefered_lft = timeout;
4325 }
4326
4327 spin_lock_bh(&ifp->lock);
4328 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4329 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4330 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4331 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4332 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4333 IFA_F_NOPREFIXROUTE);
4334 ifp->flags |= ifa_flags;
4335 ifp->tstamp = jiffies;
4336 ifp->valid_lft = valid_lft;
4337 ifp->prefered_lft = prefered_lft;
4338
4339 spin_unlock_bh(&ifp->lock);
4340 if (!(ifp->flags&IFA_F_TENTATIVE))
4341 ipv6_ifa_notify(0, ifp);
4342
4343 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4344 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4345 expires, flags);
4346 } else if (had_prefixroute) {
4347 enum cleanup_prefix_rt_t action;
4348 unsigned long rt_expires;
4349
4350 write_lock_bh(&ifp->idev->lock);
4351 action = check_cleanup_prefix_route(ifp, &rt_expires);
4352 write_unlock_bh(&ifp->idev->lock);
4353
4354 if (action != CLEANUP_PREFIX_RT_NOP) {
4355 cleanup_prefix_route(ifp, rt_expires,
4356 action == CLEANUP_PREFIX_RT_DEL);
4357 }
4358 }
4359
4360 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4361 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4362 valid_lft = prefered_lft = 0;
4363 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4364 !was_managetempaddr, jiffies);
4365 }
4366
4367 addrconf_verify_rtnl();
4368
4369 return 0;
4370 }
4371
4372 static int
4373 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4374 {
4375 struct net *net = sock_net(skb->sk);
4376 struct ifaddrmsg *ifm;
4377 struct nlattr *tb[IFA_MAX+1];
4378 struct in6_addr *pfx, *peer_pfx;
4379 struct inet6_ifaddr *ifa;
4380 struct net_device *dev;
4381 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4382 u32 ifa_flags;
4383 int err;
4384
4385 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4386 if (err < 0)
4387 return err;
4388
4389 ifm = nlmsg_data(nlh);
4390 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4391 if (!pfx)
4392 return -EINVAL;
4393
4394 if (tb[IFA_CACHEINFO]) {
4395 struct ifa_cacheinfo *ci;
4396
4397 ci = nla_data(tb[IFA_CACHEINFO]);
4398 valid_lft = ci->ifa_valid;
4399 preferred_lft = ci->ifa_prefered;
4400 } else {
4401 preferred_lft = INFINITY_LIFE_TIME;
4402 valid_lft = INFINITY_LIFE_TIME;
4403 }
4404
4405 dev = __dev_get_by_index(net, ifm->ifa_index);
4406 if (!dev)
4407 return -ENODEV;
4408
4409 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4410
4411 /* We ignore other flags so far. */
4412 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4413 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4414
4415 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4416 if (!ifa) {
4417 /*
4418 * It would be best to check for !NLM_F_CREATE here but
4419 * userspace already relies on not having to provide this.
4420 */
4421 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4422 ifm->ifa_prefixlen, ifa_flags,
4423 preferred_lft, valid_lft);
4424 }
4425
4426 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4427 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4428 err = -EEXIST;
4429 else
4430 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4431
4432 in6_ifa_put(ifa);
4433
4434 return err;
4435 }
4436
4437 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4438 u8 scope, int ifindex)
4439 {
4440 struct ifaddrmsg *ifm;
4441
4442 ifm = nlmsg_data(nlh);
4443 ifm->ifa_family = AF_INET6;
4444 ifm->ifa_prefixlen = prefixlen;
4445 ifm->ifa_flags = flags;
4446 ifm->ifa_scope = scope;
4447 ifm->ifa_index = ifindex;
4448 }
4449
4450 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4451 unsigned long tstamp, u32 preferred, u32 valid)
4452 {
4453 struct ifa_cacheinfo ci;
4454
4455 ci.cstamp = cstamp_delta(cstamp);
4456 ci.tstamp = cstamp_delta(tstamp);
4457 ci.ifa_prefered = preferred;
4458 ci.ifa_valid = valid;
4459
4460 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4461 }
4462
4463 static inline int rt_scope(int ifa_scope)
4464 {
4465 if (ifa_scope & IFA_HOST)
4466 return RT_SCOPE_HOST;
4467 else if (ifa_scope & IFA_LINK)
4468 return RT_SCOPE_LINK;
4469 else if (ifa_scope & IFA_SITE)
4470 return RT_SCOPE_SITE;
4471 else
4472 return RT_SCOPE_UNIVERSE;
4473 }
4474
4475 static inline int inet6_ifaddr_msgsize(void)
4476 {
4477 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4478 + nla_total_size(16) /* IFA_LOCAL */
4479 + nla_total_size(16) /* IFA_ADDRESS */
4480 + nla_total_size(sizeof(struct ifa_cacheinfo))
4481 + nla_total_size(4) /* IFA_FLAGS */;
4482 }
4483
4484 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4485 u32 portid, u32 seq, int event, unsigned int flags)
4486 {
4487 struct nlmsghdr *nlh;
4488 u32 preferred, valid;
4489
4490 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4491 if (!nlh)
4492 return -EMSGSIZE;
4493
4494 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4495 ifa->idev->dev->ifindex);
4496
4497 if (!((ifa->flags&IFA_F_PERMANENT) &&
4498 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4499 preferred = ifa->prefered_lft;
4500 valid = ifa->valid_lft;
4501 if (preferred != INFINITY_LIFE_TIME) {
4502 long tval = (jiffies - ifa->tstamp)/HZ;
4503 if (preferred > tval)
4504 preferred -= tval;
4505 else
4506 preferred = 0;
4507 if (valid != INFINITY_LIFE_TIME) {
4508 if (valid > tval)
4509 valid -= tval;
4510 else
4511 valid = 0;
4512 }
4513 }
4514 } else {
4515 preferred = INFINITY_LIFE_TIME;
4516 valid = INFINITY_LIFE_TIME;
4517 }
4518
4519 if (!ipv6_addr_any(&ifa->peer_addr)) {
4520 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4521 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4522 goto error;
4523 } else
4524 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4525 goto error;
4526
4527 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4528 goto error;
4529
4530 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4531 goto error;
4532
4533 nlmsg_end(skb, nlh);
4534 return 0;
4535
4536 error:
4537 nlmsg_cancel(skb, nlh);
4538 return -EMSGSIZE;
4539 }
4540
4541 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4542 u32 portid, u32 seq, int event, u16 flags)
4543 {
4544 struct nlmsghdr *nlh;
4545 u8 scope = RT_SCOPE_UNIVERSE;
4546 int ifindex = ifmca->idev->dev->ifindex;
4547
4548 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4549 scope = RT_SCOPE_SITE;
4550
4551 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4552 if (!nlh)
4553 return -EMSGSIZE;
4554
4555 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4556 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4557 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4558 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4559 nlmsg_cancel(skb, nlh);
4560 return -EMSGSIZE;
4561 }
4562
4563 nlmsg_end(skb, nlh);
4564 return 0;
4565 }
4566
4567 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4568 u32 portid, u32 seq, int event, unsigned int flags)
4569 {
4570 struct nlmsghdr *nlh;
4571 u8 scope = RT_SCOPE_UNIVERSE;
4572 int ifindex = ifaca->aca_idev->dev->ifindex;
4573
4574 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4575 scope = RT_SCOPE_SITE;
4576
4577 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4578 if (!nlh)
4579 return -EMSGSIZE;
4580
4581 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4582 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4583 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4584 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4585 nlmsg_cancel(skb, nlh);
4586 return -EMSGSIZE;
4587 }
4588
4589 nlmsg_end(skb, nlh);
4590 return 0;
4591 }
4592
4593 enum addr_type_t {
4594 UNICAST_ADDR,
4595 MULTICAST_ADDR,
4596 ANYCAST_ADDR,
4597 };
4598
4599 /* called with rcu_read_lock() */
4600 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4601 struct netlink_callback *cb, enum addr_type_t type,
4602 int s_ip_idx, int *p_ip_idx)
4603 {
4604 struct ifmcaddr6 *ifmca;
4605 struct ifacaddr6 *ifaca;
4606 int err = 1;
4607 int ip_idx = *p_ip_idx;
4608
4609 read_lock_bh(&idev->lock);
4610 switch (type) {
4611 case UNICAST_ADDR: {
4612 struct inet6_ifaddr *ifa;
4613
4614 /* unicast address incl. temp addr */
4615 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4616 if (++ip_idx < s_ip_idx)
4617 continue;
4618 err = inet6_fill_ifaddr(skb, ifa,
4619 NETLINK_CB(cb->skb).portid,
4620 cb->nlh->nlmsg_seq,
4621 RTM_NEWADDR,
4622 NLM_F_MULTI);
4623 if (err < 0)
4624 break;
4625 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4626 }
4627 break;
4628 }
4629 case MULTICAST_ADDR:
4630 /* multicast address */
4631 for (ifmca = idev->mc_list; ifmca;
4632 ifmca = ifmca->next, ip_idx++) {
4633 if (ip_idx < s_ip_idx)
4634 continue;
4635 err = inet6_fill_ifmcaddr(skb, ifmca,
4636 NETLINK_CB(cb->skb).portid,
4637 cb->nlh->nlmsg_seq,
4638 RTM_GETMULTICAST,
4639 NLM_F_MULTI);
4640 if (err < 0)
4641 break;
4642 }
4643 break;
4644 case ANYCAST_ADDR:
4645 /* anycast address */
4646 for (ifaca = idev->ac_list; ifaca;
4647 ifaca = ifaca->aca_next, ip_idx++) {
4648 if (ip_idx < s_ip_idx)
4649 continue;
4650 err = inet6_fill_ifacaddr(skb, ifaca,
4651 NETLINK_CB(cb->skb).portid,
4652 cb->nlh->nlmsg_seq,
4653 RTM_GETANYCAST,
4654 NLM_F_MULTI);
4655 if (err < 0)
4656 break;
4657 }
4658 break;
4659 default:
4660 break;
4661 }
4662 read_unlock_bh(&idev->lock);
4663 *p_ip_idx = ip_idx;
4664 return err;
4665 }
4666
4667 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4668 enum addr_type_t type)
4669 {
4670 struct net *net = sock_net(skb->sk);
4671 int h, s_h;
4672 int idx, ip_idx;
4673 int s_idx, s_ip_idx;
4674 struct net_device *dev;
4675 struct inet6_dev *idev;
4676 struct hlist_head *head;
4677
4678 s_h = cb->args[0];
4679 s_idx = idx = cb->args[1];
4680 s_ip_idx = ip_idx = cb->args[2];
4681
4682 rcu_read_lock();
4683 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4684 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4685 idx = 0;
4686 head = &net->dev_index_head[h];
4687 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4688 if (idx < s_idx)
4689 goto cont;
4690 if (h > s_h || idx > s_idx)
4691 s_ip_idx = 0;
4692 ip_idx = 0;
4693 idev = __in6_dev_get(dev);
4694 if (!idev)
4695 goto cont;
4696
4697 if (in6_dump_addrs(idev, skb, cb, type,
4698 s_ip_idx, &ip_idx) < 0)
4699 goto done;
4700 cont:
4701 idx++;
4702 }
4703 }
4704 done:
4705 rcu_read_unlock();
4706 cb->args[0] = h;
4707 cb->args[1] = idx;
4708 cb->args[2] = ip_idx;
4709
4710 return skb->len;
4711 }
4712
4713 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4714 {
4715 enum addr_type_t type = UNICAST_ADDR;
4716
4717 return inet6_dump_addr(skb, cb, type);
4718 }
4719
4720 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4721 {
4722 enum addr_type_t type = MULTICAST_ADDR;
4723
4724 return inet6_dump_addr(skb, cb, type);
4725 }
4726
4727
4728 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4729 {
4730 enum addr_type_t type = ANYCAST_ADDR;
4731
4732 return inet6_dump_addr(skb, cb, type);
4733 }
4734
4735 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4736 {
4737 struct net *net = sock_net(in_skb->sk);
4738 struct ifaddrmsg *ifm;
4739 struct nlattr *tb[IFA_MAX+1];
4740 struct in6_addr *addr = NULL, *peer;
4741 struct net_device *dev = NULL;
4742 struct inet6_ifaddr *ifa;
4743 struct sk_buff *skb;
4744 int err;
4745
4746 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4747 if (err < 0)
4748 goto errout;
4749
4750 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4751 if (!addr) {
4752 err = -EINVAL;
4753 goto errout;
4754 }
4755
4756 ifm = nlmsg_data(nlh);
4757 if (ifm->ifa_index)
4758 dev = __dev_get_by_index(net, ifm->ifa_index);
4759
4760 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4761 if (!ifa) {
4762 err = -EADDRNOTAVAIL;
4763 goto errout;
4764 }
4765
4766 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4767 if (!skb) {
4768 err = -ENOBUFS;
4769 goto errout_ifa;
4770 }
4771
4772 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4773 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4774 if (err < 0) {
4775 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4776 WARN_ON(err == -EMSGSIZE);
4777 kfree_skb(skb);
4778 goto errout_ifa;
4779 }
4780 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4781 errout_ifa:
4782 in6_ifa_put(ifa);
4783 errout:
4784 return err;
4785 }
4786
4787 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4788 {
4789 struct sk_buff *skb;
4790 struct net *net = dev_net(ifa->idev->dev);
4791 int err = -ENOBUFS;
4792
4793 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4794 if (!skb)
4795 goto errout;
4796
4797 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4798 if (err < 0) {
4799 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4800 WARN_ON(err == -EMSGSIZE);
4801 kfree_skb(skb);
4802 goto errout;
4803 }
4804 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4805 return;
4806 errout:
4807 if (err < 0)
4808 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4809 }
4810
4811 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4812 __s32 *array, int bytes)
4813 {
4814 BUG_ON(bytes < (DEVCONF_MAX * 4));
4815
4816 memset(array, 0, bytes);
4817 array[DEVCONF_FORWARDING] = cnf->forwarding;
4818 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4819 array[DEVCONF_MTU6] = cnf->mtu6;
4820 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4821 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4822 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4823 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4824 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4825 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4826 jiffies_to_msecs(cnf->rtr_solicit_interval);
4827 array[DEVCONF_RTR_SOLICIT_DELAY] =
4828 jiffies_to_msecs(cnf->rtr_solicit_delay);
4829 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4830 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4831 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4832 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4833 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4834 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4835 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4836 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4837 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4838 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4839 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4840 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4841 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4842 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4843 #ifdef CONFIG_IPV6_ROUTER_PREF
4844 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4845 array[DEVCONF_RTR_PROBE_INTERVAL] =
4846 jiffies_to_msecs(cnf->rtr_probe_interval);
4847 #ifdef CONFIG_IPV6_ROUTE_INFO
4848 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4849 #endif
4850 #endif
4851 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4852 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4853 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4854 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4855 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4856 #endif
4857 #ifdef CONFIG_IPV6_MROUTE
4858 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4859 #endif
4860 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4861 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4862 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4863 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4864 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4865 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4866 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4867 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4868 /* we omit DEVCONF_STABLE_SECRET for now */
4869 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4870 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4871 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4872 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4873 }
4874
4875 static inline size_t inet6_ifla6_size(void)
4876 {
4877 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4878 + nla_total_size(sizeof(struct ifla_cacheinfo))
4879 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4880 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4881 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4882 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4883 }
4884
4885 static inline size_t inet6_if_nlmsg_size(void)
4886 {
4887 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4888 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4889 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4890 + nla_total_size(4) /* IFLA_MTU */
4891 + nla_total_size(4) /* IFLA_LINK */
4892 + nla_total_size(1) /* IFLA_OPERSTATE */
4893 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4894 }
4895
4896 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4897 int items, int bytes)
4898 {
4899 int i;
4900 int pad = bytes - sizeof(u64) * items;
4901 BUG_ON(pad < 0);
4902
4903 /* Use put_unaligned() because stats may not be aligned for u64. */
4904 put_unaligned(items, &stats[0]);
4905 for (i = 1; i < items; i++)
4906 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4907
4908 memset(&stats[items], 0, pad);
4909 }
4910
4911 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4912 int bytes, size_t syncpoff)
4913 {
4914 int i, c;
4915 u64 buff[IPSTATS_MIB_MAX];
4916 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4917
4918 BUG_ON(pad < 0);
4919
4920 memset(buff, 0, sizeof(buff));
4921 buff[0] = IPSTATS_MIB_MAX;
4922
4923 for_each_possible_cpu(c) {
4924 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4925 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4926 }
4927
4928 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4929 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4930 }
4931
4932 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4933 int bytes)
4934 {
4935 switch (attrtype) {
4936 case IFLA_INET6_STATS:
4937 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4938 offsetof(struct ipstats_mib, syncp));
4939 break;
4940 case IFLA_INET6_ICMP6STATS:
4941 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4942 break;
4943 }
4944 }
4945
4946 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4947 u32 ext_filter_mask)
4948 {
4949 struct nlattr *nla;
4950 struct ifla_cacheinfo ci;
4951
4952 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4953 goto nla_put_failure;
4954 ci.max_reasm_len = IPV6_MAXPLEN;
4955 ci.tstamp = cstamp_delta(idev->tstamp);
4956 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4957 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4958 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4959 goto nla_put_failure;
4960 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4961 if (!nla)
4962 goto nla_put_failure;
4963 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4964
4965 /* XXX - MC not implemented */
4966
4967 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4968 return 0;
4969
4970 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4971 if (!nla)
4972 goto nla_put_failure;
4973 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4974
4975 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4976 if (!nla)
4977 goto nla_put_failure;
4978 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4979
4980 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4981 if (!nla)
4982 goto nla_put_failure;
4983
4984 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4985 goto nla_put_failure;
4986
4987 read_lock_bh(&idev->lock);
4988 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4989 read_unlock_bh(&idev->lock);
4990
4991 return 0;
4992
4993 nla_put_failure:
4994 return -EMSGSIZE;
4995 }
4996
4997 static size_t inet6_get_link_af_size(const struct net_device *dev,
4998 u32 ext_filter_mask)
4999 {
5000 if (!__in6_dev_get(dev))
5001 return 0;
5002
5003 return inet6_ifla6_size();
5004 }
5005
5006 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5007 u32 ext_filter_mask)
5008 {
5009 struct inet6_dev *idev = __in6_dev_get(dev);
5010
5011 if (!idev)
5012 return -ENODATA;
5013
5014 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5015 return -EMSGSIZE;
5016
5017 return 0;
5018 }
5019
5020 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5021 {
5022 struct inet6_ifaddr *ifp;
5023 struct net_device *dev = idev->dev;
5024 bool clear_token, update_rs = false;
5025 struct in6_addr ll_addr;
5026
5027 ASSERT_RTNL();
5028
5029 if (!token)
5030 return -EINVAL;
5031 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5032 return -EINVAL;
5033 if (!ipv6_accept_ra(idev))
5034 return -EINVAL;
5035 if (idev->cnf.rtr_solicits <= 0)
5036 return -EINVAL;
5037
5038 write_lock_bh(&idev->lock);
5039
5040 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5041 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5042
5043 write_unlock_bh(&idev->lock);
5044
5045 clear_token = ipv6_addr_any(token);
5046 if (clear_token)
5047 goto update_lft;
5048
5049 if (!idev->dead && (idev->if_flags & IF_READY) &&
5050 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5051 IFA_F_OPTIMISTIC)) {
5052 /* If we're not ready, then normal ifup will take care
5053 * of this. Otherwise, we need to request our rs here.
5054 */
5055 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5056 update_rs = true;
5057 }
5058
5059 update_lft:
5060 write_lock_bh(&idev->lock);
5061
5062 if (update_rs) {
5063 idev->if_flags |= IF_RS_SENT;
5064 idev->rs_probes = 1;
5065 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
5066 }
5067
5068 /* Well, that's kinda nasty ... */
5069 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5070 spin_lock(&ifp->lock);
5071 if (ifp->tokenized) {
5072 ifp->valid_lft = 0;
5073 ifp->prefered_lft = 0;
5074 }
5075 spin_unlock(&ifp->lock);
5076 }
5077
5078 write_unlock_bh(&idev->lock);
5079 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5080 addrconf_verify_rtnl();
5081 return 0;
5082 }
5083
5084 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5085 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5086 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5087 };
5088
5089 static int inet6_validate_link_af(const struct net_device *dev,
5090 const struct nlattr *nla)
5091 {
5092 struct nlattr *tb[IFLA_INET6_MAX + 1];
5093
5094 if (dev && !__in6_dev_get(dev))
5095 return -EAFNOSUPPORT;
5096
5097 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5098 }
5099
5100 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5101 {
5102 int err = -EINVAL;
5103 struct inet6_dev *idev = __in6_dev_get(dev);
5104 struct nlattr *tb[IFLA_INET6_MAX + 1];
5105
5106 if (!idev)
5107 return -EAFNOSUPPORT;
5108
5109 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5110 BUG();
5111
5112 if (tb[IFLA_INET6_TOKEN]) {
5113 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5114 if (err)
5115 return err;
5116 }
5117
5118 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5119 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5120
5121 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5122 mode != IN6_ADDR_GEN_MODE_NONE &&
5123 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5124 mode != IN6_ADDR_GEN_MODE_RANDOM)
5125 return -EINVAL;
5126
5127 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5128 !idev->cnf.stable_secret.initialized &&
5129 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5130 return -EINVAL;
5131
5132 idev->addr_gen_mode = mode;
5133 err = 0;
5134 }
5135
5136 return err;
5137 }
5138
5139 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5140 u32 portid, u32 seq, int event, unsigned int flags)
5141 {
5142 struct net_device *dev = idev->dev;
5143 struct ifinfomsg *hdr;
5144 struct nlmsghdr *nlh;
5145 void *protoinfo;
5146
5147 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5148 if (!nlh)
5149 return -EMSGSIZE;
5150
5151 hdr = nlmsg_data(nlh);
5152 hdr->ifi_family = AF_INET6;
5153 hdr->__ifi_pad = 0;
5154 hdr->ifi_type = dev->type;
5155 hdr->ifi_index = dev->ifindex;
5156 hdr->ifi_flags = dev_get_flags(dev);
5157 hdr->ifi_change = 0;
5158
5159 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5160 (dev->addr_len &&
5161 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5162 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5163 (dev->ifindex != dev_get_iflink(dev) &&
5164 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5165 nla_put_u8(skb, IFLA_OPERSTATE,
5166 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5167 goto nla_put_failure;
5168 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5169 if (!protoinfo)
5170 goto nla_put_failure;
5171
5172 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5173 goto nla_put_failure;
5174
5175 nla_nest_end(skb, protoinfo);
5176 nlmsg_end(skb, nlh);
5177 return 0;
5178
5179 nla_put_failure:
5180 nlmsg_cancel(skb, nlh);
5181 return -EMSGSIZE;
5182 }
5183
5184 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5185 {
5186 struct net *net = sock_net(skb->sk);
5187 int h, s_h;
5188 int idx = 0, s_idx;
5189 struct net_device *dev;
5190 struct inet6_dev *idev;
5191 struct hlist_head *head;
5192
5193 s_h = cb->args[0];
5194 s_idx = cb->args[1];
5195
5196 rcu_read_lock();
5197 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5198 idx = 0;
5199 head = &net->dev_index_head[h];
5200 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5201 if (idx < s_idx)
5202 goto cont;
5203 idev = __in6_dev_get(dev);
5204 if (!idev)
5205 goto cont;
5206 if (inet6_fill_ifinfo(skb, idev,
5207 NETLINK_CB(cb->skb).portid,
5208 cb->nlh->nlmsg_seq,
5209 RTM_NEWLINK, NLM_F_MULTI) < 0)
5210 goto out;
5211 cont:
5212 idx++;
5213 }
5214 }
5215 out:
5216 rcu_read_unlock();
5217 cb->args[1] = idx;
5218 cb->args[0] = h;
5219
5220 return skb->len;
5221 }
5222
5223 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5224 {
5225 struct sk_buff *skb;
5226 struct net *net = dev_net(idev->dev);
5227 int err = -ENOBUFS;
5228
5229 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5230 if (!skb)
5231 goto errout;
5232
5233 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5234 if (err < 0) {
5235 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5236 WARN_ON(err == -EMSGSIZE);
5237 kfree_skb(skb);
5238 goto errout;
5239 }
5240 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5241 return;
5242 errout:
5243 if (err < 0)
5244 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5245 }
5246
5247 static inline size_t inet6_prefix_nlmsg_size(void)
5248 {
5249 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5250 + nla_total_size(sizeof(struct in6_addr))
5251 + nla_total_size(sizeof(struct prefix_cacheinfo));
5252 }
5253
5254 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5255 struct prefix_info *pinfo, u32 portid, u32 seq,
5256 int event, unsigned int flags)
5257 {
5258 struct prefixmsg *pmsg;
5259 struct nlmsghdr *nlh;
5260 struct prefix_cacheinfo ci;
5261
5262 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5263 if (!nlh)
5264 return -EMSGSIZE;
5265
5266 pmsg = nlmsg_data(nlh);
5267 pmsg->prefix_family = AF_INET6;
5268 pmsg->prefix_pad1 = 0;
5269 pmsg->prefix_pad2 = 0;
5270 pmsg->prefix_ifindex = idev->dev->ifindex;
5271 pmsg->prefix_len = pinfo->prefix_len;
5272 pmsg->prefix_type = pinfo->type;
5273 pmsg->prefix_pad3 = 0;
5274 pmsg->prefix_flags = 0;
5275 if (pinfo->onlink)
5276 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5277 if (pinfo->autoconf)
5278 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5279
5280 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5281 goto nla_put_failure;
5282 ci.preferred_time = ntohl(pinfo->prefered);
5283 ci.valid_time = ntohl(pinfo->valid);
5284 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5285 goto nla_put_failure;
5286 nlmsg_end(skb, nlh);
5287 return 0;
5288
5289 nla_put_failure:
5290 nlmsg_cancel(skb, nlh);
5291 return -EMSGSIZE;
5292 }
5293
5294 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5295 struct prefix_info *pinfo)
5296 {
5297 struct sk_buff *skb;
5298 struct net *net = dev_net(idev->dev);
5299 int err = -ENOBUFS;
5300
5301 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5302 if (!skb)
5303 goto errout;
5304
5305 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5306 if (err < 0) {
5307 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5308 WARN_ON(err == -EMSGSIZE);
5309 kfree_skb(skb);
5310 goto errout;
5311 }
5312 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5313 return;
5314 errout:
5315 if (err < 0)
5316 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5317 }
5318
5319 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5320 {
5321 struct net *net = dev_net(ifp->idev->dev);
5322
5323 if (event)
5324 ASSERT_RTNL();
5325
5326 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5327
5328 switch (event) {
5329 case RTM_NEWADDR:
5330 /*
5331 * If the address was optimistic
5332 * we inserted the route at the start of
5333 * our DAD process, so we don't need
5334 * to do it again
5335 */
5336 if (!(ifp->rt->rt6i_node))
5337 ip6_ins_rt(ifp->rt);
5338 if (ifp->idev->cnf.forwarding)
5339 addrconf_join_anycast(ifp);
5340 if (!ipv6_addr_any(&ifp->peer_addr))
5341 addrconf_prefix_route(&ifp->peer_addr, 128,
5342 ifp->idev->dev, 0, 0);
5343 break;
5344 case RTM_DELADDR:
5345 if (ifp->idev->cnf.forwarding)
5346 addrconf_leave_anycast(ifp);
5347 addrconf_leave_solict(ifp->idev, &ifp->addr);
5348 if (!ipv6_addr_any(&ifp->peer_addr)) {
5349 struct rt6_info *rt;
5350
5351 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5352 ifp->idev->dev, 0, 0);
5353 if (rt)
5354 ip6_del_rt(rt);
5355 }
5356 if (ifp->rt) {
5357 dst_hold(&ifp->rt->dst);
5358 ip6_del_rt(ifp->rt);
5359 }
5360 rt_genid_bump_ipv6(net);
5361 break;
5362 }
5363 atomic_inc(&net->ipv6.dev_addr_genid);
5364 }
5365
5366 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5367 {
5368 rcu_read_lock_bh();
5369 if (likely(ifp->idev->dead == 0))
5370 __ipv6_ifa_notify(event, ifp);
5371 rcu_read_unlock_bh();
5372 }
5373
5374 #ifdef CONFIG_SYSCTL
5375
5376 static
5377 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5378 void __user *buffer, size_t *lenp, loff_t *ppos)
5379 {
5380 int *valp = ctl->data;
5381 int val = *valp;
5382 loff_t pos = *ppos;
5383 struct ctl_table lctl;
5384 int ret;
5385
5386 /*
5387 * ctl->data points to idev->cnf.forwarding, we should
5388 * not modify it until we get the rtnl lock.
5389 */
5390 lctl = *ctl;
5391 lctl.data = &val;
5392
5393 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5394
5395 if (write)
5396 ret = addrconf_fixup_forwarding(ctl, valp, val);
5397 if (ret)
5398 *ppos = pos;
5399 return ret;
5400 }
5401
5402 static
5403 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5404 void __user *buffer, size_t *lenp, loff_t *ppos)
5405 {
5406 struct ctl_table lctl;
5407 int min_hl = 1, max_hl = 255;
5408
5409 lctl = *ctl;
5410 lctl.extra1 = &min_hl;
5411 lctl.extra2 = &max_hl;
5412
5413 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5414 }
5415
5416 static
5417 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5418 void __user *buffer, size_t *lenp, loff_t *ppos)
5419 {
5420 struct inet6_dev *idev = ctl->extra1;
5421 int min_mtu = IPV6_MIN_MTU;
5422 struct ctl_table lctl;
5423
5424 lctl = *ctl;
5425 lctl.extra1 = &min_mtu;
5426 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5427
5428 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5429 }
5430
5431 static void dev_disable_change(struct inet6_dev *idev)
5432 {
5433 struct netdev_notifier_info info;
5434
5435 if (!idev || !idev->dev)
5436 return;
5437
5438 netdev_notifier_info_init(&info, idev->dev);
5439 if (idev->cnf.disable_ipv6)
5440 addrconf_notify(NULL, NETDEV_DOWN, &info);
5441 else
5442 addrconf_notify(NULL, NETDEV_UP, &info);
5443 }
5444
5445 static void addrconf_disable_change(struct net *net, __s32 newf)
5446 {
5447 struct net_device *dev;
5448 struct inet6_dev *idev;
5449
5450 rcu_read_lock();
5451 for_each_netdev_rcu(net, dev) {
5452 idev = __in6_dev_get(dev);
5453 if (idev) {
5454 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5455 idev->cnf.disable_ipv6 = newf;
5456 if (changed)
5457 dev_disable_change(idev);
5458 }
5459 }
5460 rcu_read_unlock();
5461 }
5462
5463 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5464 {
5465 struct net *net;
5466 int old;
5467
5468 if (!rtnl_trylock())
5469 return restart_syscall();
5470
5471 net = (struct net *)table->extra2;
5472 old = *p;
5473 *p = newf;
5474
5475 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5476 rtnl_unlock();
5477 return 0;
5478 }
5479
5480 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5481 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5482 addrconf_disable_change(net, newf);
5483 } else if ((!newf) ^ (!old))
5484 dev_disable_change((struct inet6_dev *)table->extra1);
5485
5486 rtnl_unlock();
5487 return 0;
5488 }
5489
5490 static
5491 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5492 void __user *buffer, size_t *lenp, loff_t *ppos)
5493 {
5494 int *valp = ctl->data;
5495 int val = *valp;
5496 loff_t pos = *ppos;
5497 struct ctl_table lctl;
5498 int ret;
5499
5500 /*
5501 * ctl->data points to idev->cnf.disable_ipv6, we should
5502 * not modify it until we get the rtnl lock.
5503 */
5504 lctl = *ctl;
5505 lctl.data = &val;
5506
5507 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5508
5509 if (write)
5510 ret = addrconf_disable_ipv6(ctl, valp, val);
5511 if (ret)
5512 *ppos = pos;
5513 return ret;
5514 }
5515
5516 static
5517 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5518 void __user *buffer, size_t *lenp, loff_t *ppos)
5519 {
5520 int *valp = ctl->data;
5521 int ret;
5522 int old, new;
5523
5524 old = *valp;
5525 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5526 new = *valp;
5527
5528 if (write && old != new) {
5529 struct net *net = ctl->extra2;
5530
5531 if (!rtnl_trylock())
5532 return restart_syscall();
5533
5534 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5535 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5536 NETCONFA_IFINDEX_DEFAULT,
5537 net->ipv6.devconf_dflt);
5538 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5539 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5540 NETCONFA_IFINDEX_ALL,
5541 net->ipv6.devconf_all);
5542 else {
5543 struct inet6_dev *idev = ctl->extra1;
5544
5545 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5546 idev->dev->ifindex,
5547 &idev->cnf);
5548 }
5549 rtnl_unlock();
5550 }
5551
5552 return ret;
5553 }
5554
5555 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5556 void __user *buffer, size_t *lenp,
5557 loff_t *ppos)
5558 {
5559 int err;
5560 struct in6_addr addr;
5561 char str[IPV6_MAX_STRLEN];
5562 struct ctl_table lctl = *ctl;
5563 struct net *net = ctl->extra2;
5564 struct ipv6_stable_secret *secret = ctl->data;
5565
5566 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5567 return -EIO;
5568
5569 lctl.maxlen = IPV6_MAX_STRLEN;
5570 lctl.data = str;
5571
5572 if (!rtnl_trylock())
5573 return restart_syscall();
5574
5575 if (!write && !secret->initialized) {
5576 err = -EIO;
5577 goto out;
5578 }
5579
5580 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5581 if (err >= sizeof(str)) {
5582 err = -EIO;
5583 goto out;
5584 }
5585
5586 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5587 if (err || !write)
5588 goto out;
5589
5590 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5591 err = -EIO;
5592 goto out;
5593 }
5594
5595 secret->initialized = true;
5596 secret->secret = addr;
5597
5598 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5599 struct net_device *dev;
5600
5601 for_each_netdev(net, dev) {
5602 struct inet6_dev *idev = __in6_dev_get(dev);
5603
5604 if (idev) {
5605 idev->addr_gen_mode =
5606 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5607 }
5608 }
5609 } else {
5610 struct inet6_dev *idev = ctl->extra1;
5611
5612 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5613 }
5614
5615 out:
5616 rtnl_unlock();
5617
5618 return err;
5619 }
5620
5621 static
5622 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5623 int write,
5624 void __user *buffer,
5625 size_t *lenp,
5626 loff_t *ppos)
5627 {
5628 int *valp = ctl->data;
5629 int val = *valp;
5630 loff_t pos = *ppos;
5631 struct ctl_table lctl;
5632 int ret;
5633
5634 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5635 * we should not modify it until we get the rtnl lock.
5636 */
5637 lctl = *ctl;
5638 lctl.data = &val;
5639
5640 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5641
5642 if (write)
5643 ret = addrconf_fixup_linkdown(ctl, valp, val);
5644 if (ret)
5645 *ppos = pos;
5646 return ret;
5647 }
5648
5649 static const struct ctl_table addrconf_sysctl[] = {
5650 {
5651 .procname = "forwarding",
5652 .data = &ipv6_devconf.forwarding,
5653 .maxlen = sizeof(int),
5654 .mode = 0644,
5655 .proc_handler = addrconf_sysctl_forward,
5656 },
5657 {
5658 .procname = "hop_limit",
5659 .data = &ipv6_devconf.hop_limit,
5660 .maxlen = sizeof(int),
5661 .mode = 0644,
5662 .proc_handler = addrconf_sysctl_hop_limit,
5663 },
5664 {
5665 .procname = "mtu",
5666 .data = &ipv6_devconf.mtu6,
5667 .maxlen = sizeof(int),
5668 .mode = 0644,
5669 .proc_handler = addrconf_sysctl_mtu,
5670 },
5671 {
5672 .procname = "accept_ra",
5673 .data = &ipv6_devconf.accept_ra,
5674 .maxlen = sizeof(int),
5675 .mode = 0644,
5676 .proc_handler = proc_dointvec,
5677 },
5678 {
5679 .procname = "accept_redirects",
5680 .data = &ipv6_devconf.accept_redirects,
5681 .maxlen = sizeof(int),
5682 .mode = 0644,
5683 .proc_handler = proc_dointvec,
5684 },
5685 {
5686 .procname = "autoconf",
5687 .data = &ipv6_devconf.autoconf,
5688 .maxlen = sizeof(int),
5689 .mode = 0644,
5690 .proc_handler = proc_dointvec,
5691 },
5692 {
5693 .procname = "dad_transmits",
5694 .data = &ipv6_devconf.dad_transmits,
5695 .maxlen = sizeof(int),
5696 .mode = 0644,
5697 .proc_handler = proc_dointvec,
5698 },
5699 {
5700 .procname = "router_solicitations",
5701 .data = &ipv6_devconf.rtr_solicits,
5702 .maxlen = sizeof(int),
5703 .mode = 0644,
5704 .proc_handler = proc_dointvec,
5705 },
5706 {
5707 .procname = "router_solicitation_interval",
5708 .data = &ipv6_devconf.rtr_solicit_interval,
5709 .maxlen = sizeof(int),
5710 .mode = 0644,
5711 .proc_handler = proc_dointvec_jiffies,
5712 },
5713 {
5714 .procname = "router_solicitation_delay",
5715 .data = &ipv6_devconf.rtr_solicit_delay,
5716 .maxlen = sizeof(int),
5717 .mode = 0644,
5718 .proc_handler = proc_dointvec_jiffies,
5719 },
5720 {
5721 .procname = "force_mld_version",
5722 .data = &ipv6_devconf.force_mld_version,
5723 .maxlen = sizeof(int),
5724 .mode = 0644,
5725 .proc_handler = proc_dointvec,
5726 },
5727 {
5728 .procname = "mldv1_unsolicited_report_interval",
5729 .data =
5730 &ipv6_devconf.mldv1_unsolicited_report_interval,
5731 .maxlen = sizeof(int),
5732 .mode = 0644,
5733 .proc_handler = proc_dointvec_ms_jiffies,
5734 },
5735 {
5736 .procname = "mldv2_unsolicited_report_interval",
5737 .data =
5738 &ipv6_devconf.mldv2_unsolicited_report_interval,
5739 .maxlen = sizeof(int),
5740 .mode = 0644,
5741 .proc_handler = proc_dointvec_ms_jiffies,
5742 },
5743 {
5744 .procname = "use_tempaddr",
5745 .data = &ipv6_devconf.use_tempaddr,
5746 .maxlen = sizeof(int),
5747 .mode = 0644,
5748 .proc_handler = proc_dointvec,
5749 },
5750 {
5751 .procname = "temp_valid_lft",
5752 .data = &ipv6_devconf.temp_valid_lft,
5753 .maxlen = sizeof(int),
5754 .mode = 0644,
5755 .proc_handler = proc_dointvec,
5756 },
5757 {
5758 .procname = "temp_prefered_lft",
5759 .data = &ipv6_devconf.temp_prefered_lft,
5760 .maxlen = sizeof(int),
5761 .mode = 0644,
5762 .proc_handler = proc_dointvec,
5763 },
5764 {
5765 .procname = "regen_max_retry",
5766 .data = &ipv6_devconf.regen_max_retry,
5767 .maxlen = sizeof(int),
5768 .mode = 0644,
5769 .proc_handler = proc_dointvec,
5770 },
5771 {
5772 .procname = "max_desync_factor",
5773 .data = &ipv6_devconf.max_desync_factor,
5774 .maxlen = sizeof(int),
5775 .mode = 0644,
5776 .proc_handler = proc_dointvec,
5777 },
5778 {
5779 .procname = "max_addresses",
5780 .data = &ipv6_devconf.max_addresses,
5781 .maxlen = sizeof(int),
5782 .mode = 0644,
5783 .proc_handler = proc_dointvec,
5784 },
5785 {
5786 .procname = "accept_ra_defrtr",
5787 .data = &ipv6_devconf.accept_ra_defrtr,
5788 .maxlen = sizeof(int),
5789 .mode = 0644,
5790 .proc_handler = proc_dointvec,
5791 },
5792 {
5793 .procname = "accept_ra_min_hop_limit",
5794 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5795 .maxlen = sizeof(int),
5796 .mode = 0644,
5797 .proc_handler = proc_dointvec,
5798 },
5799 {
5800 .procname = "accept_ra_pinfo",
5801 .data = &ipv6_devconf.accept_ra_pinfo,
5802 .maxlen = sizeof(int),
5803 .mode = 0644,
5804 .proc_handler = proc_dointvec,
5805 },
5806 #ifdef CONFIG_IPV6_ROUTER_PREF
5807 {
5808 .procname = "accept_ra_rtr_pref",
5809 .data = &ipv6_devconf.accept_ra_rtr_pref,
5810 .maxlen = sizeof(int),
5811 .mode = 0644,
5812 .proc_handler = proc_dointvec,
5813 },
5814 {
5815 .procname = "router_probe_interval",
5816 .data = &ipv6_devconf.rtr_probe_interval,
5817 .maxlen = sizeof(int),
5818 .mode = 0644,
5819 .proc_handler = proc_dointvec_jiffies,
5820 },
5821 #ifdef CONFIG_IPV6_ROUTE_INFO
5822 {
5823 .procname = "accept_ra_rt_info_max_plen",
5824 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5825 .maxlen = sizeof(int),
5826 .mode = 0644,
5827 .proc_handler = proc_dointvec,
5828 },
5829 #endif
5830 #endif
5831 {
5832 .procname = "proxy_ndp",
5833 .data = &ipv6_devconf.proxy_ndp,
5834 .maxlen = sizeof(int),
5835 .mode = 0644,
5836 .proc_handler = addrconf_sysctl_proxy_ndp,
5837 },
5838 {
5839 .procname = "accept_source_route",
5840 .data = &ipv6_devconf.accept_source_route,
5841 .maxlen = sizeof(int),
5842 .mode = 0644,
5843 .proc_handler = proc_dointvec,
5844 },
5845 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5846 {
5847 .procname = "optimistic_dad",
5848 .data = &ipv6_devconf.optimistic_dad,
5849 .maxlen = sizeof(int),
5850 .mode = 0644,
5851 .proc_handler = proc_dointvec,
5852 },
5853 {
5854 .procname = "use_optimistic",
5855 .data = &ipv6_devconf.use_optimistic,
5856 .maxlen = sizeof(int),
5857 .mode = 0644,
5858 .proc_handler = proc_dointvec,
5859 },
5860 #endif
5861 #ifdef CONFIG_IPV6_MROUTE
5862 {
5863 .procname = "mc_forwarding",
5864 .data = &ipv6_devconf.mc_forwarding,
5865 .maxlen = sizeof(int),
5866 .mode = 0444,
5867 .proc_handler = proc_dointvec,
5868 },
5869 #endif
5870 {
5871 .procname = "disable_ipv6",
5872 .data = &ipv6_devconf.disable_ipv6,
5873 .maxlen = sizeof(int),
5874 .mode = 0644,
5875 .proc_handler = addrconf_sysctl_disable,
5876 },
5877 {
5878 .procname = "accept_dad",
5879 .data = &ipv6_devconf.accept_dad,
5880 .maxlen = sizeof(int),
5881 .mode = 0644,
5882 .proc_handler = proc_dointvec,
5883 },
5884 {
5885 .procname = "force_tllao",
5886 .data = &ipv6_devconf.force_tllao,
5887 .maxlen = sizeof(int),
5888 .mode = 0644,
5889 .proc_handler = proc_dointvec
5890 },
5891 {
5892 .procname = "ndisc_notify",
5893 .data = &ipv6_devconf.ndisc_notify,
5894 .maxlen = sizeof(int),
5895 .mode = 0644,
5896 .proc_handler = proc_dointvec
5897 },
5898 {
5899 .procname = "suppress_frag_ndisc",
5900 .data = &ipv6_devconf.suppress_frag_ndisc,
5901 .maxlen = sizeof(int),
5902 .mode = 0644,
5903 .proc_handler = proc_dointvec
5904 },
5905 {
5906 .procname = "accept_ra_from_local",
5907 .data = &ipv6_devconf.accept_ra_from_local,
5908 .maxlen = sizeof(int),
5909 .mode = 0644,
5910 .proc_handler = proc_dointvec,
5911 },
5912 {
5913 .procname = "accept_ra_mtu",
5914 .data = &ipv6_devconf.accept_ra_mtu,
5915 .maxlen = sizeof(int),
5916 .mode = 0644,
5917 .proc_handler = proc_dointvec,
5918 },
5919 {
5920 .procname = "stable_secret",
5921 .data = &ipv6_devconf.stable_secret,
5922 .maxlen = IPV6_MAX_STRLEN,
5923 .mode = 0600,
5924 .proc_handler = addrconf_sysctl_stable_secret,
5925 },
5926 {
5927 .procname = "use_oif_addrs_only",
5928 .data = &ipv6_devconf.use_oif_addrs_only,
5929 .maxlen = sizeof(int),
5930 .mode = 0644,
5931 .proc_handler = proc_dointvec,
5932 },
5933 {
5934 .procname = "ignore_routes_with_linkdown",
5935 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5936 .maxlen = sizeof(int),
5937 .mode = 0644,
5938 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5939 },
5940 {
5941 .procname = "drop_unicast_in_l2_multicast",
5942 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
5943 .maxlen = sizeof(int),
5944 .mode = 0644,
5945 .proc_handler = proc_dointvec,
5946 },
5947 {
5948 .procname = "drop_unsolicited_na",
5949 .data = &ipv6_devconf.drop_unsolicited_na,
5950 .maxlen = sizeof(int),
5951 .mode = 0644,
5952 .proc_handler = proc_dointvec,
5953 },
5954 {
5955 .procname = "keep_addr_on_down",
5956 .data = &ipv6_devconf.keep_addr_on_down,
5957 .maxlen = sizeof(int),
5958 .mode = 0644,
5959 .proc_handler = proc_dointvec,
5960
5961 },
5962 {
5963 /* sentinel */
5964 }
5965 };
5966
5967 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5968 struct inet6_dev *idev, struct ipv6_devconf *p)
5969 {
5970 int i;
5971 struct ctl_table *table;
5972 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5973
5974 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
5975 if (!table)
5976 goto out;
5977
5978 for (i = 0; table[i].data; i++) {
5979 table[i].data += (char *)p - (char *)&ipv6_devconf;
5980 table[i].extra1 = idev; /* embedded; no ref */
5981 table[i].extra2 = net;
5982 }
5983
5984 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5985
5986 p->sysctl_header = register_net_sysctl(net, path, table);
5987 if (!p->sysctl_header)
5988 goto free;
5989
5990 return 0;
5991
5992 free:
5993 kfree(table);
5994 out:
5995 return -ENOBUFS;
5996 }
5997
5998 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5999 {
6000 struct ctl_table *table;
6001
6002 if (!p->sysctl_header)
6003 return;
6004
6005 table = p->sysctl_header->ctl_table_arg;
6006 unregister_net_sysctl_table(p->sysctl_header);
6007 p->sysctl_header = NULL;
6008 kfree(table);
6009 }
6010
6011 static int addrconf_sysctl_register(struct inet6_dev *idev)
6012 {
6013 int err;
6014
6015 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6016 return -EINVAL;
6017
6018 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6019 &ndisc_ifinfo_sysctl_change);
6020 if (err)
6021 return err;
6022 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6023 idev, &idev->cnf);
6024 if (err)
6025 neigh_sysctl_unregister(idev->nd_parms);
6026
6027 return err;
6028 }
6029
6030 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6031 {
6032 __addrconf_sysctl_unregister(&idev->cnf);
6033 neigh_sysctl_unregister(idev->nd_parms);
6034 }
6035
6036
6037 #endif
6038
6039 static int __net_init addrconf_init_net(struct net *net)
6040 {
6041 int err = -ENOMEM;
6042 struct ipv6_devconf *all, *dflt;
6043
6044 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6045 if (!all)
6046 goto err_alloc_all;
6047
6048 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6049 if (!dflt)
6050 goto err_alloc_dflt;
6051
6052 /* these will be inherited by all namespaces */
6053 dflt->autoconf = ipv6_defaults.autoconf;
6054 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6055
6056 dflt->stable_secret.initialized = false;
6057 all->stable_secret.initialized = false;
6058
6059 net->ipv6.devconf_all = all;
6060 net->ipv6.devconf_dflt = dflt;
6061
6062 #ifdef CONFIG_SYSCTL
6063 err = __addrconf_sysctl_register(net, "all", NULL, all);
6064 if (err < 0)
6065 goto err_reg_all;
6066
6067 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6068 if (err < 0)
6069 goto err_reg_dflt;
6070 #endif
6071 return 0;
6072
6073 #ifdef CONFIG_SYSCTL
6074 err_reg_dflt:
6075 __addrconf_sysctl_unregister(all);
6076 err_reg_all:
6077 kfree(dflt);
6078 #endif
6079 err_alloc_dflt:
6080 kfree(all);
6081 err_alloc_all:
6082 return err;
6083 }
6084
6085 static void __net_exit addrconf_exit_net(struct net *net)
6086 {
6087 #ifdef CONFIG_SYSCTL
6088 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6089 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6090 #endif
6091 kfree(net->ipv6.devconf_dflt);
6092 kfree(net->ipv6.devconf_all);
6093 }
6094
6095 static struct pernet_operations addrconf_ops = {
6096 .init = addrconf_init_net,
6097 .exit = addrconf_exit_net,
6098 };
6099
6100 static struct rtnl_af_ops inet6_ops __read_mostly = {
6101 .family = AF_INET6,
6102 .fill_link_af = inet6_fill_link_af,
6103 .get_link_af_size = inet6_get_link_af_size,
6104 .validate_link_af = inet6_validate_link_af,
6105 .set_link_af = inet6_set_link_af,
6106 };
6107
6108 /*
6109 * Init / cleanup code
6110 */
6111
6112 int __init addrconf_init(void)
6113 {
6114 struct inet6_dev *idev;
6115 int i, err;
6116
6117 err = ipv6_addr_label_init();
6118 if (err < 0) {
6119 pr_crit("%s: cannot initialize default policy table: %d\n",
6120 __func__, err);
6121 goto out;
6122 }
6123
6124 err = register_pernet_subsys(&addrconf_ops);
6125 if (err < 0)
6126 goto out_addrlabel;
6127
6128 addrconf_wq = create_workqueue("ipv6_addrconf");
6129 if (!addrconf_wq) {
6130 err = -ENOMEM;
6131 goto out_nowq;
6132 }
6133
6134 /* The addrconf netdev notifier requires that loopback_dev
6135 * has it's ipv6 private information allocated and setup
6136 * before it can bring up and give link-local addresses
6137 * to other devices which are up.
6138 *
6139 * Unfortunately, loopback_dev is not necessarily the first
6140 * entry in the global dev_base list of net devices. In fact,
6141 * it is likely to be the very last entry on that list.
6142 * So this causes the notifier registry below to try and
6143 * give link-local addresses to all devices besides loopback_dev
6144 * first, then loopback_dev, which cases all the non-loopback_dev
6145 * devices to fail to get a link-local address.
6146 *
6147 * So, as a temporary fix, allocate the ipv6 structure for
6148 * loopback_dev first by hand.
6149 * Longer term, all of the dependencies ipv6 has upon the loopback
6150 * device and it being up should be removed.
6151 */
6152 rtnl_lock();
6153 idev = ipv6_add_dev(init_net.loopback_dev);
6154 rtnl_unlock();
6155 if (IS_ERR(idev)) {
6156 err = PTR_ERR(idev);
6157 goto errlo;
6158 }
6159
6160 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6161 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6162
6163 register_netdevice_notifier(&ipv6_dev_notf);
6164
6165 addrconf_verify();
6166
6167 rtnl_af_register(&inet6_ops);
6168
6169 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6170 NULL);
6171 if (err < 0)
6172 goto errout;
6173
6174 /* Only the first call to __rtnl_register can fail */
6175 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6176 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6177 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6178 inet6_dump_ifaddr, NULL);
6179 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6180 inet6_dump_ifmcaddr, NULL);
6181 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6182 inet6_dump_ifacaddr, NULL);
6183 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6184 inet6_netconf_dump_devconf, NULL);
6185
6186 ipv6_addr_label_rtnl_register();
6187
6188 return 0;
6189 errout:
6190 rtnl_af_unregister(&inet6_ops);
6191 unregister_netdevice_notifier(&ipv6_dev_notf);
6192 errlo:
6193 destroy_workqueue(addrconf_wq);
6194 out_nowq:
6195 unregister_pernet_subsys(&addrconf_ops);
6196 out_addrlabel:
6197 ipv6_addr_label_cleanup();
6198 out:
6199 return err;
6200 }
6201
6202 void addrconf_cleanup(void)
6203 {
6204 struct net_device *dev;
6205 int i;
6206
6207 unregister_netdevice_notifier(&ipv6_dev_notf);
6208 unregister_pernet_subsys(&addrconf_ops);
6209 ipv6_addr_label_cleanup();
6210
6211 rtnl_lock();
6212
6213 __rtnl_af_unregister(&inet6_ops);
6214
6215 /* clean dev list */
6216 for_each_netdev(&init_net, dev) {
6217 if (__in6_dev_get(dev) == NULL)
6218 continue;
6219 addrconf_ifdown(dev, 1);
6220 }
6221 addrconf_ifdown(init_net.loopback_dev, 2);
6222
6223 /*
6224 * Check hash table.
6225 */
6226 spin_lock_bh(&addrconf_hash_lock);
6227 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6228 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6229 spin_unlock_bh(&addrconf_hash_lock);
6230 cancel_delayed_work(&addr_chk_work);
6231 rtnl_unlock();
6232
6233 destroy_workqueue(addrconf_wq);
6234 }
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