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Merge branch 'lwt-ipv6'
[mirror_ubuntu-jammy-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/af_ieee802154.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 <linux/if_tunnel.h>
85 #include <linux/rtnetlink.h>
86 #include <linux/netconf.h>
87 #include <linux/random.h>
88 #include <linux/uaccess.h>
89 #include <asm/unaligned.h>
90
91 #include <linux/proc_fs.h>
92 #include <linux/seq_file.h>
93 #include <linux/export.h>
94
95 /* Set to 3 to get tracing... */
96 #define ACONF_DEBUG 2
97
98 #if ACONF_DEBUG >= 3
99 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
100 #else
101 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
102 #endif
103
104 #define INFINITY_LIFE_TIME 0xFFFFFFFF
105
106 #define IPV6_MAX_STRLEN \
107 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
108
109 static inline u32 cstamp_delta(unsigned long cstamp)
110 {
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112 }
113
114 #ifdef CONFIG_SYSCTL
115 static int addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117 #else
118 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
119 {
120 return 0;
121 }
122
123 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
124 {
125 }
126 #endif
127
128 static void __ipv6_regen_rndid(struct inet6_dev *idev);
129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
130 static void ipv6_regen_rndid(unsigned long data);
131
132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
133 static int ipv6_count_addresses(struct inet6_dev *idev);
134 static int ipv6_generate_stable_address(struct in6_addr *addr,
135 u8 dad_count,
136 const struct inet6_dev *idev);
137
138 /*
139 * Configured unicast address hash table
140 */
141 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
142 static DEFINE_SPINLOCK(addrconf_hash_lock);
143
144 static void addrconf_verify(void);
145 static void addrconf_verify_rtnl(void);
146 static void addrconf_verify_work(struct work_struct *);
147
148 static struct workqueue_struct *addrconf_wq;
149 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
150
151 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
152 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
153
154 static void addrconf_type_change(struct net_device *dev,
155 unsigned long event);
156 static int addrconf_ifdown(struct net_device *dev, int how);
157
158 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
159 int plen,
160 const struct net_device *dev,
161 u32 flags, u32 noflags);
162
163 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
164 static void addrconf_dad_work(struct work_struct *w);
165 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
166 static void addrconf_dad_run(struct inet6_dev *idev);
167 static void addrconf_rs_timer(unsigned long data);
168 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170
171 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
172 struct prefix_info *pinfo);
173 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
174 struct net_device *dev);
175
176 static struct ipv6_devconf ipv6_devconf __read_mostly = {
177 .forwarding = 0,
178 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
179 .mtu6 = IPV6_MIN_MTU,
180 .accept_ra = 1,
181 .accept_redirects = 1,
182 .autoconf = 1,
183 .force_mld_version = 0,
184 .mldv1_unsolicited_report_interval = 10 * HZ,
185 .mldv2_unsolicited_report_interval = HZ,
186 .dad_transmits = 1,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
190 .use_tempaddr = 0,
191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
195 .max_addresses = IPV6_MAX_ADDRESSES,
196 .accept_ra_defrtr = 1,
197 .accept_ra_from_local = 0,
198 .accept_ra_min_hop_limit= 1,
199 .accept_ra_pinfo = 1,
200 #ifdef CONFIG_IPV6_ROUTER_PREF
201 .accept_ra_rtr_pref = 1,
202 .rtr_probe_interval = 60 * HZ,
203 #ifdef CONFIG_IPV6_ROUTE_INFO
204 .accept_ra_rt_info_max_plen = 0,
205 #endif
206 #endif
207 .proxy_ndp = 0,
208 .accept_source_route = 0, /* we do not accept RH0 by default. */
209 .disable_ipv6 = 0,
210 .accept_dad = 1,
211 .suppress_frag_ndisc = 1,
212 .accept_ra_mtu = 1,
213 .stable_secret = {
214 .initialized = false,
215 },
216 .use_oif_addrs_only = 0,
217 .ignore_routes_with_linkdown = 0,
218 };
219
220 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
221 .forwarding = 0,
222 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
223 .mtu6 = IPV6_MIN_MTU,
224 .accept_ra = 1,
225 .accept_redirects = 1,
226 .autoconf = 1,
227 .force_mld_version = 0,
228 .mldv1_unsolicited_report_interval = 10 * HZ,
229 .mldv2_unsolicited_report_interval = HZ,
230 .dad_transmits = 1,
231 .rtr_solicits = MAX_RTR_SOLICITATIONS,
232 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
233 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
234 .use_tempaddr = 0,
235 .temp_valid_lft = TEMP_VALID_LIFETIME,
236 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
237 .regen_max_retry = REGEN_MAX_RETRY,
238 .max_desync_factor = MAX_DESYNC_FACTOR,
239 .max_addresses = IPV6_MAX_ADDRESSES,
240 .accept_ra_defrtr = 1,
241 .accept_ra_from_local = 0,
242 .accept_ra_min_hop_limit= 1,
243 .accept_ra_pinfo = 1,
244 #ifdef CONFIG_IPV6_ROUTER_PREF
245 .accept_ra_rtr_pref = 1,
246 .rtr_probe_interval = 60 * HZ,
247 #ifdef CONFIG_IPV6_ROUTE_INFO
248 .accept_ra_rt_info_max_plen = 0,
249 #endif
250 #endif
251 .proxy_ndp = 0,
252 .accept_source_route = 0, /* we do not accept RH0 by default. */
253 .disable_ipv6 = 0,
254 .accept_dad = 1,
255 .suppress_frag_ndisc = 1,
256 .accept_ra_mtu = 1,
257 .stable_secret = {
258 .initialized = false,
259 },
260 .use_oif_addrs_only = 0,
261 .ignore_routes_with_linkdown = 0,
262 };
263
264 /* Check if a valid qdisc is available */
265 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
266 {
267 return !qdisc_tx_is_noop(dev);
268 }
269
270 static void addrconf_del_rs_timer(struct inet6_dev *idev)
271 {
272 if (del_timer(&idev->rs_timer))
273 __in6_dev_put(idev);
274 }
275
276 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
277 {
278 if (cancel_delayed_work(&ifp->dad_work))
279 __in6_ifa_put(ifp);
280 }
281
282 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
283 unsigned long when)
284 {
285 if (!timer_pending(&idev->rs_timer))
286 in6_dev_hold(idev);
287 mod_timer(&idev->rs_timer, jiffies + when);
288 }
289
290 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
291 unsigned long delay)
292 {
293 if (!delayed_work_pending(&ifp->dad_work))
294 in6_ifa_hold(ifp);
295 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
296 }
297
298 static int snmp6_alloc_dev(struct inet6_dev *idev)
299 {
300 int i;
301
302 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
303 if (!idev->stats.ipv6)
304 goto err_ip;
305
306 for_each_possible_cpu(i) {
307 struct ipstats_mib *addrconf_stats;
308 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
309 u64_stats_init(&addrconf_stats->syncp);
310 }
311
312
313 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
314 GFP_KERNEL);
315 if (!idev->stats.icmpv6dev)
316 goto err_icmp;
317 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
318 GFP_KERNEL);
319 if (!idev->stats.icmpv6msgdev)
320 goto err_icmpmsg;
321
322 return 0;
323
324 err_icmpmsg:
325 kfree(idev->stats.icmpv6dev);
326 err_icmp:
327 free_percpu(idev->stats.ipv6);
328 err_ip:
329 return -ENOMEM;
330 }
331
332 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
333 {
334 struct inet6_dev *ndev;
335 int err = -ENOMEM;
336
337 ASSERT_RTNL();
338
339 if (dev->mtu < IPV6_MIN_MTU)
340 return ERR_PTR(-EINVAL);
341
342 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
343 if (!ndev)
344 return ERR_PTR(err);
345
346 rwlock_init(&ndev->lock);
347 ndev->dev = dev;
348 INIT_LIST_HEAD(&ndev->addr_list);
349 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
350 (unsigned long)ndev);
351 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
352 ndev->cnf.mtu6 = dev->mtu;
353 ndev->cnf.sysctl = NULL;
354 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
355 if (!ndev->nd_parms) {
356 kfree(ndev);
357 return ERR_PTR(err);
358 }
359 if (ndev->cnf.forwarding)
360 dev_disable_lro(dev);
361 /* We refer to the device */
362 dev_hold(dev);
363
364 if (snmp6_alloc_dev(ndev) < 0) {
365 ADBG(KERN_WARNING
366 "%s: cannot allocate memory for statistics; dev=%s.\n",
367 __func__, dev->name);
368 neigh_parms_release(&nd_tbl, ndev->nd_parms);
369 dev_put(dev);
370 kfree(ndev);
371 return ERR_PTR(err);
372 }
373
374 if (snmp6_register_dev(ndev) < 0) {
375 ADBG(KERN_WARNING
376 "%s: cannot create /proc/net/dev_snmp6/%s\n",
377 __func__, dev->name);
378 goto err_release;
379 }
380
381 /* One reference from device. We must do this before
382 * we invoke __ipv6_regen_rndid().
383 */
384 in6_dev_hold(ndev);
385
386 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
387 ndev->cnf.accept_dad = -1;
388
389 #if IS_ENABLED(CONFIG_IPV6_SIT)
390 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
391 pr_info("%s: Disabled Multicast RS\n", dev->name);
392 ndev->cnf.rtr_solicits = 0;
393 }
394 #endif
395
396 INIT_LIST_HEAD(&ndev->tempaddr_list);
397 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
398 if ((dev->flags&IFF_LOOPBACK) ||
399 dev->type == ARPHRD_TUNNEL ||
400 dev->type == ARPHRD_TUNNEL6 ||
401 dev->type == ARPHRD_SIT ||
402 dev->type == ARPHRD_NONE) {
403 ndev->cnf.use_tempaddr = -1;
404 } else {
405 in6_dev_hold(ndev);
406 ipv6_regen_rndid((unsigned long) ndev);
407 }
408
409 ndev->token = in6addr_any;
410
411 if (netif_running(dev) && addrconf_qdisc_ok(dev))
412 ndev->if_flags |= IF_READY;
413
414 ipv6_mc_init_dev(ndev);
415 ndev->tstamp = jiffies;
416 err = addrconf_sysctl_register(ndev);
417 if (err) {
418 ipv6_mc_destroy_dev(ndev);
419 del_timer(&ndev->regen_timer);
420 goto err_release;
421 }
422 /* protected by rtnl_lock */
423 rcu_assign_pointer(dev->ip6_ptr, ndev);
424
425 /* Join interface-local all-node multicast group */
426 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
427
428 /* Join all-node multicast group */
429 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
430
431 /* Join all-router multicast group if forwarding is set */
432 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
433 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
434
435 return ndev;
436
437 err_release:
438 neigh_parms_release(&nd_tbl, ndev->nd_parms);
439 ndev->dead = 1;
440 in6_dev_finish_destroy(ndev);
441 return ERR_PTR(err);
442 }
443
444 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
445 {
446 struct inet6_dev *idev;
447
448 ASSERT_RTNL();
449
450 idev = __in6_dev_get(dev);
451 if (!idev) {
452 idev = ipv6_add_dev(dev);
453 if (IS_ERR(idev))
454 return NULL;
455 }
456
457 if (dev->flags&IFF_UP)
458 ipv6_mc_up(idev);
459 return idev;
460 }
461
462 static int inet6_netconf_msgsize_devconf(int type)
463 {
464 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
465 + nla_total_size(4); /* NETCONFA_IFINDEX */
466
467 /* type -1 is used for ALL */
468 if (type == -1 || type == NETCONFA_FORWARDING)
469 size += nla_total_size(4);
470 #ifdef CONFIG_IPV6_MROUTE
471 if (type == -1 || type == NETCONFA_MC_FORWARDING)
472 size += nla_total_size(4);
473 #endif
474 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
475 size += nla_total_size(4);
476
477 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
478 size += nla_total_size(4);
479
480 return size;
481 }
482
483 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
484 struct ipv6_devconf *devconf, u32 portid,
485 u32 seq, int event, unsigned int flags,
486 int type)
487 {
488 struct nlmsghdr *nlh;
489 struct netconfmsg *ncm;
490
491 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
492 flags);
493 if (!nlh)
494 return -EMSGSIZE;
495
496 ncm = nlmsg_data(nlh);
497 ncm->ncm_family = AF_INET6;
498
499 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
500 goto nla_put_failure;
501
502 /* type -1 is used for ALL */
503 if ((type == -1 || type == NETCONFA_FORWARDING) &&
504 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
505 goto nla_put_failure;
506 #ifdef CONFIG_IPV6_MROUTE
507 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
508 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
509 devconf->mc_forwarding) < 0)
510 goto nla_put_failure;
511 #endif
512 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
513 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
514 goto nla_put_failure;
515
516 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
517 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
518 devconf->ignore_routes_with_linkdown) < 0)
519 goto nla_put_failure;
520
521 nlmsg_end(skb, nlh);
522 return 0;
523
524 nla_put_failure:
525 nlmsg_cancel(skb, nlh);
526 return -EMSGSIZE;
527 }
528
529 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
530 struct ipv6_devconf *devconf)
531 {
532 struct sk_buff *skb;
533 int err = -ENOBUFS;
534
535 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
536 if (!skb)
537 goto errout;
538
539 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
540 RTM_NEWNETCONF, 0, type);
541 if (err < 0) {
542 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
543 WARN_ON(err == -EMSGSIZE);
544 kfree_skb(skb);
545 goto errout;
546 }
547 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
548 return;
549 errout:
550 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
551 }
552
553 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
554 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
555 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
556 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
557 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
558 };
559
560 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
561 struct nlmsghdr *nlh)
562 {
563 struct net *net = sock_net(in_skb->sk);
564 struct nlattr *tb[NETCONFA_MAX+1];
565 struct netconfmsg *ncm;
566 struct sk_buff *skb;
567 struct ipv6_devconf *devconf;
568 struct inet6_dev *in6_dev;
569 struct net_device *dev;
570 int ifindex;
571 int err;
572
573 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
574 devconf_ipv6_policy);
575 if (err < 0)
576 goto errout;
577
578 err = EINVAL;
579 if (!tb[NETCONFA_IFINDEX])
580 goto errout;
581
582 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
583 switch (ifindex) {
584 case NETCONFA_IFINDEX_ALL:
585 devconf = net->ipv6.devconf_all;
586 break;
587 case NETCONFA_IFINDEX_DEFAULT:
588 devconf = net->ipv6.devconf_dflt;
589 break;
590 default:
591 dev = __dev_get_by_index(net, ifindex);
592 if (!dev)
593 goto errout;
594 in6_dev = __in6_dev_get(dev);
595 if (!in6_dev)
596 goto errout;
597 devconf = &in6_dev->cnf;
598 break;
599 }
600
601 err = -ENOBUFS;
602 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
603 if (!skb)
604 goto errout;
605
606 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
607 NETLINK_CB(in_skb).portid,
608 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
609 -1);
610 if (err < 0) {
611 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
612 WARN_ON(err == -EMSGSIZE);
613 kfree_skb(skb);
614 goto errout;
615 }
616 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
617 errout:
618 return err;
619 }
620
621 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
622 struct netlink_callback *cb)
623 {
624 struct net *net = sock_net(skb->sk);
625 int h, s_h;
626 int idx, s_idx;
627 struct net_device *dev;
628 struct inet6_dev *idev;
629 struct hlist_head *head;
630
631 s_h = cb->args[0];
632 s_idx = idx = cb->args[1];
633
634 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
635 idx = 0;
636 head = &net->dev_index_head[h];
637 rcu_read_lock();
638 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
639 net->dev_base_seq;
640 hlist_for_each_entry_rcu(dev, head, index_hlist) {
641 if (idx < s_idx)
642 goto cont;
643 idev = __in6_dev_get(dev);
644 if (!idev)
645 goto cont;
646
647 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
648 &idev->cnf,
649 NETLINK_CB(cb->skb).portid,
650 cb->nlh->nlmsg_seq,
651 RTM_NEWNETCONF,
652 NLM_F_MULTI,
653 -1) < 0) {
654 rcu_read_unlock();
655 goto done;
656 }
657 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
658 cont:
659 idx++;
660 }
661 rcu_read_unlock();
662 }
663 if (h == NETDEV_HASHENTRIES) {
664 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
665 net->ipv6.devconf_all,
666 NETLINK_CB(cb->skb).portid,
667 cb->nlh->nlmsg_seq,
668 RTM_NEWNETCONF, NLM_F_MULTI,
669 -1) < 0)
670 goto done;
671 else
672 h++;
673 }
674 if (h == NETDEV_HASHENTRIES + 1) {
675 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
676 net->ipv6.devconf_dflt,
677 NETLINK_CB(cb->skb).portid,
678 cb->nlh->nlmsg_seq,
679 RTM_NEWNETCONF, NLM_F_MULTI,
680 -1) < 0)
681 goto done;
682 else
683 h++;
684 }
685 done:
686 cb->args[0] = h;
687 cb->args[1] = idx;
688
689 return skb->len;
690 }
691
692 #ifdef CONFIG_SYSCTL
693 static void dev_forward_change(struct inet6_dev *idev)
694 {
695 struct net_device *dev;
696 struct inet6_ifaddr *ifa;
697
698 if (!idev)
699 return;
700 dev = idev->dev;
701 if (idev->cnf.forwarding)
702 dev_disable_lro(dev);
703 if (dev->flags & IFF_MULTICAST) {
704 if (idev->cnf.forwarding) {
705 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
706 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
707 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
708 } else {
709 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
710 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
711 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
712 }
713 }
714
715 list_for_each_entry(ifa, &idev->addr_list, if_list) {
716 if (ifa->flags&IFA_F_TENTATIVE)
717 continue;
718 if (idev->cnf.forwarding)
719 addrconf_join_anycast(ifa);
720 else
721 addrconf_leave_anycast(ifa);
722 }
723 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
724 dev->ifindex, &idev->cnf);
725 }
726
727
728 static void addrconf_forward_change(struct net *net, __s32 newf)
729 {
730 struct net_device *dev;
731 struct inet6_dev *idev;
732
733 for_each_netdev(net, dev) {
734 idev = __in6_dev_get(dev);
735 if (idev) {
736 int changed = (!idev->cnf.forwarding) ^ (!newf);
737 idev->cnf.forwarding = newf;
738 if (changed)
739 dev_forward_change(idev);
740 }
741 }
742 }
743
744 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
745 {
746 struct net *net;
747 int old;
748
749 if (!rtnl_trylock())
750 return restart_syscall();
751
752 net = (struct net *)table->extra2;
753 old = *p;
754 *p = newf;
755
756 if (p == &net->ipv6.devconf_dflt->forwarding) {
757 if ((!newf) ^ (!old))
758 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
759 NETCONFA_IFINDEX_DEFAULT,
760 net->ipv6.devconf_dflt);
761 rtnl_unlock();
762 return 0;
763 }
764
765 if (p == &net->ipv6.devconf_all->forwarding) {
766 net->ipv6.devconf_dflt->forwarding = newf;
767 addrconf_forward_change(net, newf);
768 if ((!newf) ^ (!old))
769 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
770 NETCONFA_IFINDEX_ALL,
771 net->ipv6.devconf_all);
772 } else if ((!newf) ^ (!old))
773 dev_forward_change((struct inet6_dev *)table->extra1);
774 rtnl_unlock();
775
776 if (newf)
777 rt6_purge_dflt_routers(net);
778 return 1;
779 }
780
781 static void addrconf_linkdown_change(struct net *net, __s32 newf)
782 {
783 struct net_device *dev;
784 struct inet6_dev *idev;
785
786 for_each_netdev(net, dev) {
787 idev = __in6_dev_get(dev);
788 if (idev) {
789 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
790
791 idev->cnf.ignore_routes_with_linkdown = newf;
792 if (changed)
793 inet6_netconf_notify_devconf(dev_net(dev),
794 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
795 dev->ifindex,
796 &idev->cnf);
797 }
798 }
799 }
800
801 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
802 {
803 struct net *net;
804 int old;
805
806 if (!rtnl_trylock())
807 return restart_syscall();
808
809 net = (struct net *)table->extra2;
810 old = *p;
811 *p = newf;
812
813 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
814 if ((!newf) ^ (!old))
815 inet6_netconf_notify_devconf(net,
816 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
817 NETCONFA_IFINDEX_DEFAULT,
818 net->ipv6.devconf_dflt);
819 rtnl_unlock();
820 return 0;
821 }
822
823 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
824 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
825 addrconf_linkdown_change(net, newf);
826 if ((!newf) ^ (!old))
827 inet6_netconf_notify_devconf(net,
828 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
829 NETCONFA_IFINDEX_ALL,
830 net->ipv6.devconf_all);
831 }
832 rtnl_unlock();
833
834 return 1;
835 }
836
837 #endif
838
839 /* Nobody refers to this ifaddr, destroy it */
840 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
841 {
842 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
843
844 #ifdef NET_REFCNT_DEBUG
845 pr_debug("%s\n", __func__);
846 #endif
847
848 in6_dev_put(ifp->idev);
849
850 if (cancel_delayed_work(&ifp->dad_work))
851 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
852 ifp);
853
854 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
855 pr_warn("Freeing alive inet6 address %p\n", ifp);
856 return;
857 }
858 ip6_rt_put(ifp->rt);
859
860 kfree_rcu(ifp, rcu);
861 }
862
863 static void
864 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
865 {
866 struct list_head *p;
867 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
868
869 /*
870 * Each device address list is sorted in order of scope -
871 * global before linklocal.
872 */
873 list_for_each(p, &idev->addr_list) {
874 struct inet6_ifaddr *ifa
875 = list_entry(p, struct inet6_ifaddr, if_list);
876 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
877 break;
878 }
879
880 list_add_tail(&ifp->if_list, p);
881 }
882
883 static u32 inet6_addr_hash(const struct in6_addr *addr)
884 {
885 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
886 }
887
888 /* On success it returns ifp with increased reference count */
889
890 static struct inet6_ifaddr *
891 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
892 const struct in6_addr *peer_addr, int pfxlen,
893 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
894 {
895 struct inet6_ifaddr *ifa = NULL;
896 struct rt6_info *rt;
897 unsigned int hash;
898 int err = 0;
899 int addr_type = ipv6_addr_type(addr);
900
901 if (addr_type == IPV6_ADDR_ANY ||
902 addr_type & IPV6_ADDR_MULTICAST ||
903 (!(idev->dev->flags & IFF_LOOPBACK) &&
904 addr_type & IPV6_ADDR_LOOPBACK))
905 return ERR_PTR(-EADDRNOTAVAIL);
906
907 rcu_read_lock_bh();
908 if (idev->dead) {
909 err = -ENODEV; /*XXX*/
910 goto out2;
911 }
912
913 if (idev->cnf.disable_ipv6) {
914 err = -EACCES;
915 goto out2;
916 }
917
918 spin_lock(&addrconf_hash_lock);
919
920 /* Ignore adding duplicate addresses on an interface */
921 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
922 ADBG("ipv6_add_addr: already assigned\n");
923 err = -EEXIST;
924 goto out;
925 }
926
927 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
928
929 if (!ifa) {
930 ADBG("ipv6_add_addr: malloc failed\n");
931 err = -ENOBUFS;
932 goto out;
933 }
934
935 rt = addrconf_dst_alloc(idev, addr, false);
936 if (IS_ERR(rt)) {
937 err = PTR_ERR(rt);
938 goto out;
939 }
940
941 neigh_parms_data_state_setall(idev->nd_parms);
942
943 ifa->addr = *addr;
944 if (peer_addr)
945 ifa->peer_addr = *peer_addr;
946
947 spin_lock_init(&ifa->lock);
948 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
949 INIT_HLIST_NODE(&ifa->addr_lst);
950 ifa->scope = scope;
951 ifa->prefix_len = pfxlen;
952 ifa->flags = flags | IFA_F_TENTATIVE;
953 ifa->valid_lft = valid_lft;
954 ifa->prefered_lft = prefered_lft;
955 ifa->cstamp = ifa->tstamp = jiffies;
956 ifa->tokenized = false;
957
958 ifa->rt = rt;
959
960 ifa->idev = idev;
961 in6_dev_hold(idev);
962 /* For caller */
963 in6_ifa_hold(ifa);
964
965 /* Add to big hash table */
966 hash = inet6_addr_hash(addr);
967
968 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
969 spin_unlock(&addrconf_hash_lock);
970
971 write_lock(&idev->lock);
972 /* Add to inet6_dev unicast addr list. */
973 ipv6_link_dev_addr(idev, ifa);
974
975 if (ifa->flags&IFA_F_TEMPORARY) {
976 list_add(&ifa->tmp_list, &idev->tempaddr_list);
977 in6_ifa_hold(ifa);
978 }
979
980 in6_ifa_hold(ifa);
981 write_unlock(&idev->lock);
982 out2:
983 rcu_read_unlock_bh();
984
985 if (likely(err == 0))
986 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
987 else {
988 kfree(ifa);
989 ifa = ERR_PTR(err);
990 }
991
992 return ifa;
993 out:
994 spin_unlock(&addrconf_hash_lock);
995 goto out2;
996 }
997
998 enum cleanup_prefix_rt_t {
999 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1000 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1001 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1002 };
1003
1004 /*
1005 * Check, whether the prefix for ifp would still need a prefix route
1006 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1007 * constants.
1008 *
1009 * 1) we don't purge prefix if address was not permanent.
1010 * prefix is managed by its own lifetime.
1011 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1012 * 3) if there are no addresses, delete prefix.
1013 * 4) if there are still other permanent address(es),
1014 * corresponding prefix is still permanent.
1015 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1016 * don't purge the prefix, assume user space is managing it.
1017 * 6) otherwise, update prefix lifetime to the
1018 * longest valid lifetime among the corresponding
1019 * addresses on the device.
1020 * Note: subsequent RA will update lifetime.
1021 **/
1022 static enum cleanup_prefix_rt_t
1023 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1024 {
1025 struct inet6_ifaddr *ifa;
1026 struct inet6_dev *idev = ifp->idev;
1027 unsigned long lifetime;
1028 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1029
1030 *expires = jiffies;
1031
1032 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1033 if (ifa == ifp)
1034 continue;
1035 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1036 ifp->prefix_len))
1037 continue;
1038 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1039 return CLEANUP_PREFIX_RT_NOP;
1040
1041 action = CLEANUP_PREFIX_RT_EXPIRE;
1042
1043 spin_lock(&ifa->lock);
1044
1045 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1046 /*
1047 * Note: Because this address is
1048 * not permanent, lifetime <
1049 * LONG_MAX / HZ here.
1050 */
1051 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1052 *expires = ifa->tstamp + lifetime * HZ;
1053 spin_unlock(&ifa->lock);
1054 }
1055
1056 return action;
1057 }
1058
1059 static void
1060 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1061 {
1062 struct rt6_info *rt;
1063
1064 rt = addrconf_get_prefix_route(&ifp->addr,
1065 ifp->prefix_len,
1066 ifp->idev->dev,
1067 0, RTF_GATEWAY | RTF_DEFAULT);
1068 if (rt) {
1069 if (del_rt)
1070 ip6_del_rt(rt);
1071 else {
1072 if (!(rt->rt6i_flags & RTF_EXPIRES))
1073 rt6_set_expires(rt, expires);
1074 ip6_rt_put(rt);
1075 }
1076 }
1077 }
1078
1079
1080 /* This function wants to get referenced ifp and releases it before return */
1081
1082 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1083 {
1084 int state;
1085 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1086 unsigned long expires;
1087
1088 ASSERT_RTNL();
1089
1090 spin_lock_bh(&ifp->lock);
1091 state = ifp->state;
1092 ifp->state = INET6_IFADDR_STATE_DEAD;
1093 spin_unlock_bh(&ifp->lock);
1094
1095 if (state == INET6_IFADDR_STATE_DEAD)
1096 goto out;
1097
1098 spin_lock_bh(&addrconf_hash_lock);
1099 hlist_del_init_rcu(&ifp->addr_lst);
1100 spin_unlock_bh(&addrconf_hash_lock);
1101
1102 write_lock_bh(&ifp->idev->lock);
1103
1104 if (ifp->flags&IFA_F_TEMPORARY) {
1105 list_del(&ifp->tmp_list);
1106 if (ifp->ifpub) {
1107 in6_ifa_put(ifp->ifpub);
1108 ifp->ifpub = NULL;
1109 }
1110 __in6_ifa_put(ifp);
1111 }
1112
1113 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1114 action = check_cleanup_prefix_route(ifp, &expires);
1115
1116 list_del_init(&ifp->if_list);
1117 __in6_ifa_put(ifp);
1118
1119 write_unlock_bh(&ifp->idev->lock);
1120
1121 addrconf_del_dad_work(ifp);
1122
1123 ipv6_ifa_notify(RTM_DELADDR, ifp);
1124
1125 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1126
1127 if (action != CLEANUP_PREFIX_RT_NOP) {
1128 cleanup_prefix_route(ifp, expires,
1129 action == CLEANUP_PREFIX_RT_DEL);
1130 }
1131
1132 /* clean up prefsrc entries */
1133 rt6_remove_prefsrc(ifp);
1134 out:
1135 in6_ifa_put(ifp);
1136 }
1137
1138 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1139 {
1140 struct inet6_dev *idev = ifp->idev;
1141 struct in6_addr addr, *tmpaddr;
1142 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1143 unsigned long regen_advance;
1144 int tmp_plen;
1145 int ret = 0;
1146 u32 addr_flags;
1147 unsigned long now = jiffies;
1148
1149 write_lock_bh(&idev->lock);
1150 if (ift) {
1151 spin_lock_bh(&ift->lock);
1152 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1153 spin_unlock_bh(&ift->lock);
1154 tmpaddr = &addr;
1155 } else {
1156 tmpaddr = NULL;
1157 }
1158 retry:
1159 in6_dev_hold(idev);
1160 if (idev->cnf.use_tempaddr <= 0) {
1161 write_unlock_bh(&idev->lock);
1162 pr_info("%s: use_tempaddr is disabled\n", __func__);
1163 in6_dev_put(idev);
1164 ret = -1;
1165 goto out;
1166 }
1167 spin_lock_bh(&ifp->lock);
1168 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1169 idev->cnf.use_tempaddr = -1; /*XXX*/
1170 spin_unlock_bh(&ifp->lock);
1171 write_unlock_bh(&idev->lock);
1172 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1173 __func__);
1174 in6_dev_put(idev);
1175 ret = -1;
1176 goto out;
1177 }
1178 in6_ifa_hold(ifp);
1179 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1180 __ipv6_try_regen_rndid(idev, tmpaddr);
1181 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1182 age = (now - ifp->tstamp) / HZ;
1183 tmp_valid_lft = min_t(__u32,
1184 ifp->valid_lft,
1185 idev->cnf.temp_valid_lft + age);
1186 tmp_prefered_lft = min_t(__u32,
1187 ifp->prefered_lft,
1188 idev->cnf.temp_prefered_lft + age -
1189 idev->cnf.max_desync_factor);
1190 tmp_plen = ifp->prefix_len;
1191 tmp_tstamp = ifp->tstamp;
1192 spin_unlock_bh(&ifp->lock);
1193
1194 regen_advance = idev->cnf.regen_max_retry *
1195 idev->cnf.dad_transmits *
1196 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1197 write_unlock_bh(&idev->lock);
1198
1199 /* A temporary address is created only if this calculated Preferred
1200 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1201 * an implementation must not create a temporary address with a zero
1202 * Preferred Lifetime.
1203 * Use age calculation as in addrconf_verify to avoid unnecessary
1204 * temporary addresses being generated.
1205 */
1206 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1207 if (tmp_prefered_lft <= regen_advance + age) {
1208 in6_ifa_put(ifp);
1209 in6_dev_put(idev);
1210 ret = -1;
1211 goto out;
1212 }
1213
1214 addr_flags = IFA_F_TEMPORARY;
1215 /* set in addrconf_prefix_rcv() */
1216 if (ifp->flags & IFA_F_OPTIMISTIC)
1217 addr_flags |= IFA_F_OPTIMISTIC;
1218
1219 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1220 ipv6_addr_scope(&addr), addr_flags,
1221 tmp_valid_lft, tmp_prefered_lft);
1222 if (IS_ERR(ift)) {
1223 in6_ifa_put(ifp);
1224 in6_dev_put(idev);
1225 pr_info("%s: retry temporary address regeneration\n", __func__);
1226 tmpaddr = &addr;
1227 write_lock_bh(&idev->lock);
1228 goto retry;
1229 }
1230
1231 spin_lock_bh(&ift->lock);
1232 ift->ifpub = ifp;
1233 ift->cstamp = now;
1234 ift->tstamp = tmp_tstamp;
1235 spin_unlock_bh(&ift->lock);
1236
1237 addrconf_dad_start(ift);
1238 in6_ifa_put(ift);
1239 in6_dev_put(idev);
1240 out:
1241 return ret;
1242 }
1243
1244 /*
1245 * Choose an appropriate source address (RFC3484)
1246 */
1247 enum {
1248 IPV6_SADDR_RULE_INIT = 0,
1249 IPV6_SADDR_RULE_LOCAL,
1250 IPV6_SADDR_RULE_SCOPE,
1251 IPV6_SADDR_RULE_PREFERRED,
1252 #ifdef CONFIG_IPV6_MIP6
1253 IPV6_SADDR_RULE_HOA,
1254 #endif
1255 IPV6_SADDR_RULE_OIF,
1256 IPV6_SADDR_RULE_LABEL,
1257 IPV6_SADDR_RULE_PRIVACY,
1258 IPV6_SADDR_RULE_ORCHID,
1259 IPV6_SADDR_RULE_PREFIX,
1260 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1261 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1262 #endif
1263 IPV6_SADDR_RULE_MAX
1264 };
1265
1266 struct ipv6_saddr_score {
1267 int rule;
1268 int addr_type;
1269 struct inet6_ifaddr *ifa;
1270 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1271 int scopedist;
1272 int matchlen;
1273 };
1274
1275 struct ipv6_saddr_dst {
1276 const struct in6_addr *addr;
1277 int ifindex;
1278 int scope;
1279 int label;
1280 unsigned int prefs;
1281 };
1282
1283 static inline int ipv6_saddr_preferred(int type)
1284 {
1285 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1286 return 1;
1287 return 0;
1288 }
1289
1290 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1291 {
1292 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1293 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1294 #else
1295 return false;
1296 #endif
1297 }
1298
1299 static int ipv6_get_saddr_eval(struct net *net,
1300 struct ipv6_saddr_score *score,
1301 struct ipv6_saddr_dst *dst,
1302 int i)
1303 {
1304 int ret;
1305
1306 if (i <= score->rule) {
1307 switch (i) {
1308 case IPV6_SADDR_RULE_SCOPE:
1309 ret = score->scopedist;
1310 break;
1311 case IPV6_SADDR_RULE_PREFIX:
1312 ret = score->matchlen;
1313 break;
1314 default:
1315 ret = !!test_bit(i, score->scorebits);
1316 }
1317 goto out;
1318 }
1319
1320 switch (i) {
1321 case IPV6_SADDR_RULE_INIT:
1322 /* Rule 0: remember if hiscore is not ready yet */
1323 ret = !!score->ifa;
1324 break;
1325 case IPV6_SADDR_RULE_LOCAL:
1326 /* Rule 1: Prefer same address */
1327 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1328 break;
1329 case IPV6_SADDR_RULE_SCOPE:
1330 /* Rule 2: Prefer appropriate scope
1331 *
1332 * ret
1333 * ^
1334 * -1 | d 15
1335 * ---+--+-+---> scope
1336 * |
1337 * | d is scope of the destination.
1338 * B-d | \
1339 * | \ <- smaller scope is better if
1340 * B-15 | \ if scope is enough for destination.
1341 * | ret = B - scope (-1 <= scope >= d <= 15).
1342 * d-C-1 | /
1343 * |/ <- greater is better
1344 * -C / if scope is not enough for destination.
1345 * /| ret = scope - C (-1 <= d < scope <= 15).
1346 *
1347 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1348 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1349 * Assume B = 0 and we get C > 29.
1350 */
1351 ret = __ipv6_addr_src_scope(score->addr_type);
1352 if (ret >= dst->scope)
1353 ret = -ret;
1354 else
1355 ret -= 128; /* 30 is enough */
1356 score->scopedist = ret;
1357 break;
1358 case IPV6_SADDR_RULE_PREFERRED:
1359 {
1360 /* Rule 3: Avoid deprecated and optimistic addresses */
1361 u8 avoid = IFA_F_DEPRECATED;
1362
1363 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1364 avoid |= IFA_F_OPTIMISTIC;
1365 ret = ipv6_saddr_preferred(score->addr_type) ||
1366 !(score->ifa->flags & avoid);
1367 break;
1368 }
1369 #ifdef CONFIG_IPV6_MIP6
1370 case IPV6_SADDR_RULE_HOA:
1371 {
1372 /* Rule 4: Prefer home address */
1373 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1374 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1375 break;
1376 }
1377 #endif
1378 case IPV6_SADDR_RULE_OIF:
1379 /* Rule 5: Prefer outgoing interface */
1380 ret = (!dst->ifindex ||
1381 dst->ifindex == score->ifa->idev->dev->ifindex);
1382 break;
1383 case IPV6_SADDR_RULE_LABEL:
1384 /* Rule 6: Prefer matching label */
1385 ret = ipv6_addr_label(net,
1386 &score->ifa->addr, score->addr_type,
1387 score->ifa->idev->dev->ifindex) == dst->label;
1388 break;
1389 case IPV6_SADDR_RULE_PRIVACY:
1390 {
1391 /* Rule 7: Prefer public address
1392 * Note: prefer temporary address if use_tempaddr >= 2
1393 */
1394 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1395 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1396 score->ifa->idev->cnf.use_tempaddr >= 2;
1397 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1398 break;
1399 }
1400 case IPV6_SADDR_RULE_ORCHID:
1401 /* Rule 8-: Prefer ORCHID vs ORCHID or
1402 * non-ORCHID vs non-ORCHID
1403 */
1404 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1405 ipv6_addr_orchid(dst->addr));
1406 break;
1407 case IPV6_SADDR_RULE_PREFIX:
1408 /* Rule 8: Use longest matching prefix */
1409 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1410 if (ret > score->ifa->prefix_len)
1411 ret = score->ifa->prefix_len;
1412 score->matchlen = ret;
1413 break;
1414 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1415 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1416 /* Optimistic addresses still have lower precedence than other
1417 * preferred addresses.
1418 */
1419 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1420 break;
1421 #endif
1422 default:
1423 ret = 0;
1424 }
1425
1426 if (ret)
1427 __set_bit(i, score->scorebits);
1428 score->rule = i;
1429 out:
1430 return ret;
1431 }
1432
1433 static int __ipv6_dev_get_saddr(struct net *net,
1434 struct ipv6_saddr_dst *dst,
1435 struct inet6_dev *idev,
1436 struct ipv6_saddr_score *scores,
1437 int hiscore_idx)
1438 {
1439 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1440
1441 read_lock_bh(&idev->lock);
1442 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1443 int i;
1444
1445 /*
1446 * - Tentative Address (RFC2462 section 5.4)
1447 * - A tentative address is not considered
1448 * "assigned to an interface" in the traditional
1449 * sense, unless it is also flagged as optimistic.
1450 * - Candidate Source Address (section 4)
1451 * - In any case, anycast addresses, multicast
1452 * addresses, and the unspecified address MUST
1453 * NOT be included in a candidate set.
1454 */
1455 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1456 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1457 continue;
1458
1459 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1460
1461 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1462 score->addr_type & IPV6_ADDR_MULTICAST)) {
1463 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1464 idev->dev->name);
1465 continue;
1466 }
1467
1468 score->rule = -1;
1469 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1470
1471 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1472 int minihiscore, miniscore;
1473
1474 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1475 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1476
1477 if (minihiscore > miniscore) {
1478 if (i == IPV6_SADDR_RULE_SCOPE &&
1479 score->scopedist > 0) {
1480 /*
1481 * special case:
1482 * each remaining entry
1483 * has too small (not enough)
1484 * scope, because ifa entries
1485 * are sorted by their scope
1486 * values.
1487 */
1488 goto out;
1489 }
1490 break;
1491 } else if (minihiscore < miniscore) {
1492 if (hiscore->ifa)
1493 in6_ifa_put(hiscore->ifa);
1494
1495 in6_ifa_hold(score->ifa);
1496
1497 swap(hiscore, score);
1498 hiscore_idx = 1 - hiscore_idx;
1499
1500 /* restore our iterator */
1501 score->ifa = hiscore->ifa;
1502
1503 break;
1504 }
1505 }
1506 }
1507 out:
1508 read_unlock_bh(&idev->lock);
1509 return hiscore_idx;
1510 }
1511
1512 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1513 const struct in6_addr *daddr, unsigned int prefs,
1514 struct in6_addr *saddr)
1515 {
1516 struct ipv6_saddr_score scores[2], *hiscore;
1517 struct ipv6_saddr_dst dst;
1518 struct inet6_dev *idev;
1519 struct net_device *dev;
1520 int dst_type;
1521 bool use_oif_addr = false;
1522 int hiscore_idx = 0;
1523
1524 dst_type = __ipv6_addr_type(daddr);
1525 dst.addr = daddr;
1526 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1527 dst.scope = __ipv6_addr_src_scope(dst_type);
1528 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1529 dst.prefs = prefs;
1530
1531 scores[hiscore_idx].rule = -1;
1532 scores[hiscore_idx].ifa = NULL;
1533
1534 rcu_read_lock();
1535
1536 /* Candidate Source Address (section 4)
1537 * - multicast and link-local destination address,
1538 * the set of candidate source address MUST only
1539 * include addresses assigned to interfaces
1540 * belonging to the same link as the outgoing
1541 * interface.
1542 * (- For site-local destination addresses, the
1543 * set of candidate source addresses MUST only
1544 * include addresses assigned to interfaces
1545 * belonging to the same site as the outgoing
1546 * interface.)
1547 * - "It is RECOMMENDED that the candidate source addresses
1548 * be the set of unicast addresses assigned to the
1549 * interface that will be used to send to the destination
1550 * (the 'outgoing' interface)." (RFC 6724)
1551 */
1552 if (dst_dev) {
1553 idev = __in6_dev_get(dst_dev);
1554 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1555 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1556 (idev && idev->cnf.use_oif_addrs_only)) {
1557 use_oif_addr = true;
1558 }
1559 }
1560
1561 if (use_oif_addr) {
1562 if (idev)
1563 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1564 } else {
1565 for_each_netdev_rcu(net, dev) {
1566 idev = __in6_dev_get(dev);
1567 if (!idev)
1568 continue;
1569 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1570 }
1571 }
1572 rcu_read_unlock();
1573
1574 hiscore = &scores[hiscore_idx];
1575 if (!hiscore->ifa)
1576 return -EADDRNOTAVAIL;
1577
1578 *saddr = hiscore->ifa->addr;
1579 in6_ifa_put(hiscore->ifa);
1580 return 0;
1581 }
1582 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1583
1584 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1585 u32 banned_flags)
1586 {
1587 struct inet6_ifaddr *ifp;
1588 int err = -EADDRNOTAVAIL;
1589
1590 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1591 if (ifp->scope > IFA_LINK)
1592 break;
1593 if (ifp->scope == IFA_LINK &&
1594 !(ifp->flags & banned_flags)) {
1595 *addr = ifp->addr;
1596 err = 0;
1597 break;
1598 }
1599 }
1600 return err;
1601 }
1602
1603 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1604 u32 banned_flags)
1605 {
1606 struct inet6_dev *idev;
1607 int err = -EADDRNOTAVAIL;
1608
1609 rcu_read_lock();
1610 idev = __in6_dev_get(dev);
1611 if (idev) {
1612 read_lock_bh(&idev->lock);
1613 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1614 read_unlock_bh(&idev->lock);
1615 }
1616 rcu_read_unlock();
1617 return err;
1618 }
1619
1620 static int ipv6_count_addresses(struct inet6_dev *idev)
1621 {
1622 int cnt = 0;
1623 struct inet6_ifaddr *ifp;
1624
1625 read_lock_bh(&idev->lock);
1626 list_for_each_entry(ifp, &idev->addr_list, if_list)
1627 cnt++;
1628 read_unlock_bh(&idev->lock);
1629 return cnt;
1630 }
1631
1632 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1633 const struct net_device *dev, int strict)
1634 {
1635 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1636 }
1637 EXPORT_SYMBOL(ipv6_chk_addr);
1638
1639 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1640 const struct net_device *dev, int strict,
1641 u32 banned_flags)
1642 {
1643 struct inet6_ifaddr *ifp;
1644 unsigned int hash = inet6_addr_hash(addr);
1645 u32 ifp_flags;
1646
1647 rcu_read_lock_bh();
1648 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1649 if (!net_eq(dev_net(ifp->idev->dev), net))
1650 continue;
1651 /* Decouple optimistic from tentative for evaluation here.
1652 * Ban optimistic addresses explicitly, when required.
1653 */
1654 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1655 ? (ifp->flags&~IFA_F_TENTATIVE)
1656 : ifp->flags;
1657 if (ipv6_addr_equal(&ifp->addr, addr) &&
1658 !(ifp_flags&banned_flags) &&
1659 (!dev || ifp->idev->dev == dev ||
1660 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1661 rcu_read_unlock_bh();
1662 return 1;
1663 }
1664 }
1665
1666 rcu_read_unlock_bh();
1667 return 0;
1668 }
1669 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1670
1671 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1672 struct net_device *dev)
1673 {
1674 unsigned int hash = inet6_addr_hash(addr);
1675 struct inet6_ifaddr *ifp;
1676
1677 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1678 if (!net_eq(dev_net(ifp->idev->dev), net))
1679 continue;
1680 if (ipv6_addr_equal(&ifp->addr, addr)) {
1681 if (!dev || ifp->idev->dev == dev)
1682 return true;
1683 }
1684 }
1685 return false;
1686 }
1687
1688 /* Compares an address/prefix_len with addresses on device @dev.
1689 * If one is found it returns true.
1690 */
1691 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1692 const unsigned int prefix_len, struct net_device *dev)
1693 {
1694 struct inet6_dev *idev;
1695 struct inet6_ifaddr *ifa;
1696 bool ret = false;
1697
1698 rcu_read_lock();
1699 idev = __in6_dev_get(dev);
1700 if (idev) {
1701 read_lock_bh(&idev->lock);
1702 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1703 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1704 if (ret)
1705 break;
1706 }
1707 read_unlock_bh(&idev->lock);
1708 }
1709 rcu_read_unlock();
1710
1711 return ret;
1712 }
1713 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1714
1715 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1716 {
1717 struct inet6_dev *idev;
1718 struct inet6_ifaddr *ifa;
1719 int onlink;
1720
1721 onlink = 0;
1722 rcu_read_lock();
1723 idev = __in6_dev_get(dev);
1724 if (idev) {
1725 read_lock_bh(&idev->lock);
1726 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1727 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1728 ifa->prefix_len);
1729 if (onlink)
1730 break;
1731 }
1732 read_unlock_bh(&idev->lock);
1733 }
1734 rcu_read_unlock();
1735 return onlink;
1736 }
1737 EXPORT_SYMBOL(ipv6_chk_prefix);
1738
1739 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1740 struct net_device *dev, int strict)
1741 {
1742 struct inet6_ifaddr *ifp, *result = NULL;
1743 unsigned int hash = inet6_addr_hash(addr);
1744
1745 rcu_read_lock_bh();
1746 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1747 if (!net_eq(dev_net(ifp->idev->dev), net))
1748 continue;
1749 if (ipv6_addr_equal(&ifp->addr, addr)) {
1750 if (!dev || ifp->idev->dev == dev ||
1751 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1752 result = ifp;
1753 in6_ifa_hold(ifp);
1754 break;
1755 }
1756 }
1757 }
1758 rcu_read_unlock_bh();
1759
1760 return result;
1761 }
1762
1763 /* Gets referenced address, destroys ifaddr */
1764
1765 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1766 {
1767 if (ifp->flags&IFA_F_PERMANENT) {
1768 spin_lock_bh(&ifp->lock);
1769 addrconf_del_dad_work(ifp);
1770 ifp->flags |= IFA_F_TENTATIVE;
1771 if (dad_failed)
1772 ifp->flags |= IFA_F_DADFAILED;
1773 spin_unlock_bh(&ifp->lock);
1774 if (dad_failed)
1775 ipv6_ifa_notify(0, ifp);
1776 in6_ifa_put(ifp);
1777 } else if (ifp->flags&IFA_F_TEMPORARY) {
1778 struct inet6_ifaddr *ifpub;
1779 spin_lock_bh(&ifp->lock);
1780 ifpub = ifp->ifpub;
1781 if (ifpub) {
1782 in6_ifa_hold(ifpub);
1783 spin_unlock_bh(&ifp->lock);
1784 ipv6_create_tempaddr(ifpub, ifp);
1785 in6_ifa_put(ifpub);
1786 } else {
1787 spin_unlock_bh(&ifp->lock);
1788 }
1789 ipv6_del_addr(ifp);
1790 } else {
1791 ipv6_del_addr(ifp);
1792 }
1793 }
1794
1795 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1796 {
1797 int err = -ENOENT;
1798
1799 spin_lock_bh(&ifp->lock);
1800 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1801 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1802 err = 0;
1803 }
1804 spin_unlock_bh(&ifp->lock);
1805
1806 return err;
1807 }
1808
1809 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1810 {
1811 struct in6_addr addr;
1812 struct inet6_dev *idev = ifp->idev;
1813 struct net *net = dev_net(ifp->idev->dev);
1814
1815 if (addrconf_dad_end(ifp)) {
1816 in6_ifa_put(ifp);
1817 return;
1818 }
1819
1820 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1821 ifp->idev->dev->name, &ifp->addr);
1822
1823 spin_lock_bh(&ifp->lock);
1824
1825 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1826 int scope = ifp->scope;
1827 u32 flags = ifp->flags;
1828 struct in6_addr new_addr;
1829 struct inet6_ifaddr *ifp2;
1830 u32 valid_lft, preferred_lft;
1831 int pfxlen = ifp->prefix_len;
1832 int retries = ifp->stable_privacy_retry + 1;
1833
1834 if (retries > net->ipv6.sysctl.idgen_retries) {
1835 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1836 ifp->idev->dev->name);
1837 goto errdad;
1838 }
1839
1840 new_addr = ifp->addr;
1841 if (ipv6_generate_stable_address(&new_addr, retries,
1842 idev))
1843 goto errdad;
1844
1845 valid_lft = ifp->valid_lft;
1846 preferred_lft = ifp->prefered_lft;
1847
1848 spin_unlock_bh(&ifp->lock);
1849
1850 if (idev->cnf.max_addresses &&
1851 ipv6_count_addresses(idev) >=
1852 idev->cnf.max_addresses)
1853 goto lock_errdad;
1854
1855 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1856 ifp->idev->dev->name);
1857
1858 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1859 scope, flags, valid_lft,
1860 preferred_lft);
1861 if (IS_ERR(ifp2))
1862 goto lock_errdad;
1863
1864 spin_lock_bh(&ifp2->lock);
1865 ifp2->stable_privacy_retry = retries;
1866 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1867 spin_unlock_bh(&ifp2->lock);
1868
1869 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1870 in6_ifa_put(ifp2);
1871 lock_errdad:
1872 spin_lock_bh(&ifp->lock);
1873 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1874 addr.s6_addr32[0] = htonl(0xfe800000);
1875 addr.s6_addr32[1] = 0;
1876
1877 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1878 ipv6_addr_equal(&ifp->addr, &addr)) {
1879 /* DAD failed for link-local based on MAC address */
1880 idev->cnf.disable_ipv6 = 1;
1881
1882 pr_info("%s: IPv6 being disabled!\n",
1883 ifp->idev->dev->name);
1884 }
1885 }
1886
1887 errdad:
1888 /* transition from _POSTDAD to _ERRDAD */
1889 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1890 spin_unlock_bh(&ifp->lock);
1891
1892 addrconf_mod_dad_work(ifp, 0);
1893 }
1894
1895 /* Join to solicited addr multicast group.
1896 * caller must hold RTNL */
1897 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1898 {
1899 struct in6_addr maddr;
1900
1901 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1902 return;
1903
1904 addrconf_addr_solict_mult(addr, &maddr);
1905 ipv6_dev_mc_inc(dev, &maddr);
1906 }
1907
1908 /* caller must hold RTNL */
1909 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1910 {
1911 struct in6_addr maddr;
1912
1913 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1914 return;
1915
1916 addrconf_addr_solict_mult(addr, &maddr);
1917 __ipv6_dev_mc_dec(idev, &maddr);
1918 }
1919
1920 /* caller must hold RTNL */
1921 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1922 {
1923 struct in6_addr addr;
1924
1925 if (ifp->prefix_len >= 127) /* RFC 6164 */
1926 return;
1927 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1928 if (ipv6_addr_any(&addr))
1929 return;
1930 __ipv6_dev_ac_inc(ifp->idev, &addr);
1931 }
1932
1933 /* caller must hold RTNL */
1934 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1935 {
1936 struct in6_addr addr;
1937
1938 if (ifp->prefix_len >= 127) /* RFC 6164 */
1939 return;
1940 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1941 if (ipv6_addr_any(&addr))
1942 return;
1943 __ipv6_dev_ac_dec(ifp->idev, &addr);
1944 }
1945
1946 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1947 {
1948 if (dev->addr_len != ETH_ALEN)
1949 return -1;
1950 memcpy(eui, dev->dev_addr, 3);
1951 memcpy(eui + 5, dev->dev_addr + 3, 3);
1952
1953 /*
1954 * The zSeries OSA network cards can be shared among various
1955 * OS instances, but the OSA cards have only one MAC address.
1956 * This leads to duplicate address conflicts in conjunction
1957 * with IPv6 if more than one instance uses the same card.
1958 *
1959 * The driver for these cards can deliver a unique 16-bit
1960 * identifier for each instance sharing the same card. It is
1961 * placed instead of 0xFFFE in the interface identifier. The
1962 * "u" bit of the interface identifier is not inverted in this
1963 * case. Hence the resulting interface identifier has local
1964 * scope according to RFC2373.
1965 */
1966 if (dev->dev_id) {
1967 eui[3] = (dev->dev_id >> 8) & 0xFF;
1968 eui[4] = dev->dev_id & 0xFF;
1969 } else {
1970 eui[3] = 0xFF;
1971 eui[4] = 0xFE;
1972 eui[0] ^= 2;
1973 }
1974 return 0;
1975 }
1976
1977 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1978 {
1979 if (dev->addr_len != IEEE802154_ADDR_LEN)
1980 return -1;
1981 memcpy(eui, dev->dev_addr, 8);
1982 eui[0] ^= 2;
1983 return 0;
1984 }
1985
1986 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1987 {
1988 union fwnet_hwaddr *ha;
1989
1990 if (dev->addr_len != FWNET_ALEN)
1991 return -1;
1992
1993 ha = (union fwnet_hwaddr *)dev->dev_addr;
1994
1995 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1996 eui[0] ^= 2;
1997 return 0;
1998 }
1999
2000 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2001 {
2002 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2003 if (dev->addr_len != ARCNET_ALEN)
2004 return -1;
2005 memset(eui, 0, 7);
2006 eui[7] = *(u8 *)dev->dev_addr;
2007 return 0;
2008 }
2009
2010 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2011 {
2012 if (dev->addr_len != INFINIBAND_ALEN)
2013 return -1;
2014 memcpy(eui, dev->dev_addr + 12, 8);
2015 eui[0] |= 2;
2016 return 0;
2017 }
2018
2019 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2020 {
2021 if (addr == 0)
2022 return -1;
2023 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2024 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2025 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2026 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2027 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2028 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2029 eui[1] = 0;
2030 eui[2] = 0x5E;
2031 eui[3] = 0xFE;
2032 memcpy(eui + 4, &addr, 4);
2033 return 0;
2034 }
2035
2036 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2037 {
2038 if (dev->priv_flags & IFF_ISATAP)
2039 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2040 return -1;
2041 }
2042
2043 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2044 {
2045 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2046 }
2047
2048 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2049 {
2050 memcpy(eui, dev->perm_addr, 3);
2051 memcpy(eui + 5, dev->perm_addr + 3, 3);
2052 eui[3] = 0xFF;
2053 eui[4] = 0xFE;
2054 eui[0] ^= 2;
2055 return 0;
2056 }
2057
2058 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2059 {
2060 switch (dev->type) {
2061 case ARPHRD_ETHER:
2062 case ARPHRD_FDDI:
2063 return addrconf_ifid_eui48(eui, dev);
2064 case ARPHRD_ARCNET:
2065 return addrconf_ifid_arcnet(eui, dev);
2066 case ARPHRD_INFINIBAND:
2067 return addrconf_ifid_infiniband(eui, dev);
2068 case ARPHRD_SIT:
2069 return addrconf_ifid_sit(eui, dev);
2070 case ARPHRD_IPGRE:
2071 return addrconf_ifid_gre(eui, dev);
2072 case ARPHRD_6LOWPAN:
2073 case ARPHRD_IEEE802154:
2074 return addrconf_ifid_eui64(eui, dev);
2075 case ARPHRD_IEEE1394:
2076 return addrconf_ifid_ieee1394(eui, dev);
2077 case ARPHRD_TUNNEL6:
2078 return addrconf_ifid_ip6tnl(eui, dev);
2079 }
2080 return -1;
2081 }
2082
2083 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2084 {
2085 int err = -1;
2086 struct inet6_ifaddr *ifp;
2087
2088 read_lock_bh(&idev->lock);
2089 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2090 if (ifp->scope > IFA_LINK)
2091 break;
2092 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2093 memcpy(eui, ifp->addr.s6_addr+8, 8);
2094 err = 0;
2095 break;
2096 }
2097 }
2098 read_unlock_bh(&idev->lock);
2099 return err;
2100 }
2101
2102 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2103 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2104 {
2105 regen:
2106 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2107 idev->rndid[0] &= ~0x02;
2108
2109 /*
2110 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2111 * check if generated address is not inappropriate
2112 *
2113 * - Reserved subnet anycast (RFC 2526)
2114 * 11111101 11....11 1xxxxxxx
2115 * - ISATAP (RFC4214) 6.1
2116 * 00-00-5E-FE-xx-xx-xx-xx
2117 * - value 0
2118 * - XXX: already assigned to an address on the device
2119 */
2120 if (idev->rndid[0] == 0xfd &&
2121 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2122 (idev->rndid[7]&0x80))
2123 goto regen;
2124 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2125 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2126 goto regen;
2127 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2128 goto regen;
2129 }
2130 }
2131
2132 static void ipv6_regen_rndid(unsigned long data)
2133 {
2134 struct inet6_dev *idev = (struct inet6_dev *) data;
2135 unsigned long expires;
2136
2137 rcu_read_lock_bh();
2138 write_lock_bh(&idev->lock);
2139
2140 if (idev->dead)
2141 goto out;
2142
2143 __ipv6_regen_rndid(idev);
2144
2145 expires = jiffies +
2146 idev->cnf.temp_prefered_lft * HZ -
2147 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2148 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2149 idev->cnf.max_desync_factor * HZ;
2150 if (time_before(expires, jiffies)) {
2151 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2152 __func__, idev->dev->name);
2153 goto out;
2154 }
2155
2156 if (!mod_timer(&idev->regen_timer, expires))
2157 in6_dev_hold(idev);
2158
2159 out:
2160 write_unlock_bh(&idev->lock);
2161 rcu_read_unlock_bh();
2162 in6_dev_put(idev);
2163 }
2164
2165 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2166 {
2167 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2168 __ipv6_regen_rndid(idev);
2169 }
2170
2171 /*
2172 * Add prefix route.
2173 */
2174
2175 static void
2176 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2177 unsigned long expires, u32 flags)
2178 {
2179 struct fib6_config cfg = {
2180 .fc_table = RT6_TABLE_PREFIX,
2181 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2182 .fc_ifindex = dev->ifindex,
2183 .fc_expires = expires,
2184 .fc_dst_len = plen,
2185 .fc_flags = RTF_UP | flags,
2186 .fc_nlinfo.nl_net = dev_net(dev),
2187 .fc_protocol = RTPROT_KERNEL,
2188 };
2189
2190 cfg.fc_dst = *pfx;
2191
2192 /* Prevent useless cloning on PtP SIT.
2193 This thing is done here expecting that the whole
2194 class of non-broadcast devices need not cloning.
2195 */
2196 #if IS_ENABLED(CONFIG_IPV6_SIT)
2197 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2198 cfg.fc_flags |= RTF_NONEXTHOP;
2199 #endif
2200
2201 ip6_route_add(&cfg);
2202 }
2203
2204
2205 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2206 int plen,
2207 const struct net_device *dev,
2208 u32 flags, u32 noflags)
2209 {
2210 struct fib6_node *fn;
2211 struct rt6_info *rt = NULL;
2212 struct fib6_table *table;
2213
2214 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2215 if (!table)
2216 return NULL;
2217
2218 read_lock_bh(&table->tb6_lock);
2219 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2220 if (!fn)
2221 goto out;
2222
2223 noflags |= RTF_CACHE;
2224 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2225 if (rt->dst.dev->ifindex != dev->ifindex)
2226 continue;
2227 if ((rt->rt6i_flags & flags) != flags)
2228 continue;
2229 if ((rt->rt6i_flags & noflags) != 0)
2230 continue;
2231 dst_hold(&rt->dst);
2232 break;
2233 }
2234 out:
2235 read_unlock_bh(&table->tb6_lock);
2236 return rt;
2237 }
2238
2239
2240 /* Create "default" multicast route to the interface */
2241
2242 static void addrconf_add_mroute(struct net_device *dev)
2243 {
2244 struct fib6_config cfg = {
2245 .fc_table = RT6_TABLE_LOCAL,
2246 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2247 .fc_ifindex = dev->ifindex,
2248 .fc_dst_len = 8,
2249 .fc_flags = RTF_UP,
2250 .fc_nlinfo.nl_net = dev_net(dev),
2251 };
2252
2253 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2254
2255 ip6_route_add(&cfg);
2256 }
2257
2258 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2259 {
2260 struct inet6_dev *idev;
2261
2262 ASSERT_RTNL();
2263
2264 idev = ipv6_find_idev(dev);
2265 if (!idev)
2266 return ERR_PTR(-ENOBUFS);
2267
2268 if (idev->cnf.disable_ipv6)
2269 return ERR_PTR(-EACCES);
2270
2271 /* Add default multicast route */
2272 if (!(dev->flags & IFF_LOOPBACK))
2273 addrconf_add_mroute(dev);
2274
2275 return idev;
2276 }
2277
2278 static void manage_tempaddrs(struct inet6_dev *idev,
2279 struct inet6_ifaddr *ifp,
2280 __u32 valid_lft, __u32 prefered_lft,
2281 bool create, unsigned long now)
2282 {
2283 u32 flags;
2284 struct inet6_ifaddr *ift;
2285
2286 read_lock_bh(&idev->lock);
2287 /* update all temporary addresses in the list */
2288 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2289 int age, max_valid, max_prefered;
2290
2291 if (ifp != ift->ifpub)
2292 continue;
2293
2294 /* RFC 4941 section 3.3:
2295 * If a received option will extend the lifetime of a public
2296 * address, the lifetimes of temporary addresses should
2297 * be extended, subject to the overall constraint that no
2298 * temporary addresses should ever remain "valid" or "preferred"
2299 * for a time longer than (TEMP_VALID_LIFETIME) or
2300 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2301 */
2302 age = (now - ift->cstamp) / HZ;
2303 max_valid = idev->cnf.temp_valid_lft - age;
2304 if (max_valid < 0)
2305 max_valid = 0;
2306
2307 max_prefered = idev->cnf.temp_prefered_lft -
2308 idev->cnf.max_desync_factor - age;
2309 if (max_prefered < 0)
2310 max_prefered = 0;
2311
2312 if (valid_lft > max_valid)
2313 valid_lft = max_valid;
2314
2315 if (prefered_lft > max_prefered)
2316 prefered_lft = max_prefered;
2317
2318 spin_lock(&ift->lock);
2319 flags = ift->flags;
2320 ift->valid_lft = valid_lft;
2321 ift->prefered_lft = prefered_lft;
2322 ift->tstamp = now;
2323 if (prefered_lft > 0)
2324 ift->flags &= ~IFA_F_DEPRECATED;
2325
2326 spin_unlock(&ift->lock);
2327 if (!(flags&IFA_F_TENTATIVE))
2328 ipv6_ifa_notify(0, ift);
2329 }
2330
2331 if ((create || list_empty(&idev->tempaddr_list)) &&
2332 idev->cnf.use_tempaddr > 0) {
2333 /* When a new public address is created as described
2334 * in [ADDRCONF], also create a new temporary address.
2335 * Also create a temporary address if it's enabled but
2336 * no temporary address currently exists.
2337 */
2338 read_unlock_bh(&idev->lock);
2339 ipv6_create_tempaddr(ifp, NULL);
2340 } else {
2341 read_unlock_bh(&idev->lock);
2342 }
2343 }
2344
2345 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2346 {
2347 struct prefix_info *pinfo;
2348 __u32 valid_lft;
2349 __u32 prefered_lft;
2350 int addr_type;
2351 u32 addr_flags = 0;
2352 struct inet6_dev *in6_dev;
2353 struct net *net = dev_net(dev);
2354
2355 pinfo = (struct prefix_info *) opt;
2356
2357 if (len < sizeof(struct prefix_info)) {
2358 ADBG("addrconf: prefix option too short\n");
2359 return;
2360 }
2361
2362 /*
2363 * Validation checks ([ADDRCONF], page 19)
2364 */
2365
2366 addr_type = ipv6_addr_type(&pinfo->prefix);
2367
2368 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2369 return;
2370
2371 valid_lft = ntohl(pinfo->valid);
2372 prefered_lft = ntohl(pinfo->prefered);
2373
2374 if (prefered_lft > valid_lft) {
2375 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2376 return;
2377 }
2378
2379 in6_dev = in6_dev_get(dev);
2380
2381 if (!in6_dev) {
2382 net_dbg_ratelimited("addrconf: device %s not configured\n",
2383 dev->name);
2384 return;
2385 }
2386
2387 /*
2388 * Two things going on here:
2389 * 1) Add routes for on-link prefixes
2390 * 2) Configure prefixes with the auto flag set
2391 */
2392
2393 if (pinfo->onlink) {
2394 struct rt6_info *rt;
2395 unsigned long rt_expires;
2396
2397 /* Avoid arithmetic overflow. Really, we could
2398 * save rt_expires in seconds, likely valid_lft,
2399 * but it would require division in fib gc, that it
2400 * not good.
2401 */
2402 if (HZ > USER_HZ)
2403 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2404 else
2405 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2406
2407 if (addrconf_finite_timeout(rt_expires))
2408 rt_expires *= HZ;
2409
2410 rt = addrconf_get_prefix_route(&pinfo->prefix,
2411 pinfo->prefix_len,
2412 dev,
2413 RTF_ADDRCONF | RTF_PREFIX_RT,
2414 RTF_GATEWAY | RTF_DEFAULT);
2415
2416 if (rt) {
2417 /* Autoconf prefix route */
2418 if (valid_lft == 0) {
2419 ip6_del_rt(rt);
2420 rt = NULL;
2421 } else if (addrconf_finite_timeout(rt_expires)) {
2422 /* not infinity */
2423 rt6_set_expires(rt, jiffies + rt_expires);
2424 } else {
2425 rt6_clean_expires(rt);
2426 }
2427 } else if (valid_lft) {
2428 clock_t expires = 0;
2429 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2430 if (addrconf_finite_timeout(rt_expires)) {
2431 /* not infinity */
2432 flags |= RTF_EXPIRES;
2433 expires = jiffies_to_clock_t(rt_expires);
2434 }
2435 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2436 dev, expires, flags);
2437 }
2438 ip6_rt_put(rt);
2439 }
2440
2441 /* Try to figure out our local address for this prefix */
2442
2443 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2444 struct inet6_ifaddr *ifp;
2445 struct in6_addr addr;
2446 int create = 0, update_lft = 0;
2447 bool tokenized = false;
2448
2449 if (pinfo->prefix_len == 64) {
2450 memcpy(&addr, &pinfo->prefix, 8);
2451
2452 if (!ipv6_addr_any(&in6_dev->token)) {
2453 read_lock_bh(&in6_dev->lock);
2454 memcpy(addr.s6_addr + 8,
2455 in6_dev->token.s6_addr + 8, 8);
2456 read_unlock_bh(&in6_dev->lock);
2457 tokenized = true;
2458 } else if (in6_dev->addr_gen_mode ==
2459 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2460 !ipv6_generate_stable_address(&addr, 0,
2461 in6_dev)) {
2462 addr_flags |= IFA_F_STABLE_PRIVACY;
2463 goto ok;
2464 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2465 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2466 in6_dev_put(in6_dev);
2467 return;
2468 }
2469 goto ok;
2470 }
2471 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2472 pinfo->prefix_len);
2473 in6_dev_put(in6_dev);
2474 return;
2475
2476 ok:
2477
2478 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2479
2480 if (!ifp && valid_lft) {
2481 int max_addresses = in6_dev->cnf.max_addresses;
2482
2483 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2484 if (in6_dev->cnf.optimistic_dad &&
2485 !net->ipv6.devconf_all->forwarding && sllao)
2486 addr_flags = IFA_F_OPTIMISTIC;
2487 #endif
2488
2489 /* Do not allow to create too much of autoconfigured
2490 * addresses; this would be too easy way to crash kernel.
2491 */
2492 if (!max_addresses ||
2493 ipv6_count_addresses(in6_dev) < max_addresses)
2494 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2495 pinfo->prefix_len,
2496 addr_type&IPV6_ADDR_SCOPE_MASK,
2497 addr_flags, valid_lft,
2498 prefered_lft);
2499
2500 if (IS_ERR_OR_NULL(ifp)) {
2501 in6_dev_put(in6_dev);
2502 return;
2503 }
2504
2505 update_lft = 0;
2506 create = 1;
2507 spin_lock_bh(&ifp->lock);
2508 ifp->flags |= IFA_F_MANAGETEMPADDR;
2509 ifp->cstamp = jiffies;
2510 ifp->tokenized = tokenized;
2511 spin_unlock_bh(&ifp->lock);
2512 addrconf_dad_start(ifp);
2513 }
2514
2515 if (ifp) {
2516 u32 flags;
2517 unsigned long now;
2518 u32 stored_lft;
2519
2520 /* update lifetime (RFC2462 5.5.3 e) */
2521 spin_lock_bh(&ifp->lock);
2522 now = jiffies;
2523 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2524 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2525 else
2526 stored_lft = 0;
2527 if (!update_lft && !create && stored_lft) {
2528 const u32 minimum_lft = min_t(u32,
2529 stored_lft, MIN_VALID_LIFETIME);
2530 valid_lft = max(valid_lft, minimum_lft);
2531
2532 /* RFC4862 Section 5.5.3e:
2533 * "Note that the preferred lifetime of the
2534 * corresponding address is always reset to
2535 * the Preferred Lifetime in the received
2536 * Prefix Information option, regardless of
2537 * whether the valid lifetime is also reset or
2538 * ignored."
2539 *
2540 * So we should always update prefered_lft here.
2541 */
2542 update_lft = 1;
2543 }
2544
2545 if (update_lft) {
2546 ifp->valid_lft = valid_lft;
2547 ifp->prefered_lft = prefered_lft;
2548 ifp->tstamp = now;
2549 flags = ifp->flags;
2550 ifp->flags &= ~IFA_F_DEPRECATED;
2551 spin_unlock_bh(&ifp->lock);
2552
2553 if (!(flags&IFA_F_TENTATIVE))
2554 ipv6_ifa_notify(0, ifp);
2555 } else
2556 spin_unlock_bh(&ifp->lock);
2557
2558 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2559 create, now);
2560
2561 in6_ifa_put(ifp);
2562 addrconf_verify();
2563 }
2564 }
2565 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2566 in6_dev_put(in6_dev);
2567 }
2568
2569 /*
2570 * Set destination address.
2571 * Special case for SIT interfaces where we create a new "virtual"
2572 * device.
2573 */
2574 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2575 {
2576 struct in6_ifreq ireq;
2577 struct net_device *dev;
2578 int err = -EINVAL;
2579
2580 rtnl_lock();
2581
2582 err = -EFAULT;
2583 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2584 goto err_exit;
2585
2586 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2587
2588 err = -ENODEV;
2589 if (!dev)
2590 goto err_exit;
2591
2592 #if IS_ENABLED(CONFIG_IPV6_SIT)
2593 if (dev->type == ARPHRD_SIT) {
2594 const struct net_device_ops *ops = dev->netdev_ops;
2595 struct ifreq ifr;
2596 struct ip_tunnel_parm p;
2597
2598 err = -EADDRNOTAVAIL;
2599 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2600 goto err_exit;
2601
2602 memset(&p, 0, sizeof(p));
2603 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2604 p.iph.saddr = 0;
2605 p.iph.version = 4;
2606 p.iph.ihl = 5;
2607 p.iph.protocol = IPPROTO_IPV6;
2608 p.iph.ttl = 64;
2609 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2610
2611 if (ops->ndo_do_ioctl) {
2612 mm_segment_t oldfs = get_fs();
2613
2614 set_fs(KERNEL_DS);
2615 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2616 set_fs(oldfs);
2617 } else
2618 err = -EOPNOTSUPP;
2619
2620 if (err == 0) {
2621 err = -ENOBUFS;
2622 dev = __dev_get_by_name(net, p.name);
2623 if (!dev)
2624 goto err_exit;
2625 err = dev_open(dev);
2626 }
2627 }
2628 #endif
2629
2630 err_exit:
2631 rtnl_unlock();
2632 return err;
2633 }
2634
2635 static int ipv6_mc_config(struct sock *sk, bool join,
2636 const struct in6_addr *addr, int ifindex)
2637 {
2638 int ret;
2639
2640 ASSERT_RTNL();
2641
2642 lock_sock(sk);
2643 if (join)
2644 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2645 else
2646 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2647 release_sock(sk);
2648
2649 return ret;
2650 }
2651
2652 /*
2653 * Manual configuration of address on an interface
2654 */
2655 static int inet6_addr_add(struct net *net, int ifindex,
2656 const struct in6_addr *pfx,
2657 const struct in6_addr *peer_pfx,
2658 unsigned int plen, __u32 ifa_flags,
2659 __u32 prefered_lft, __u32 valid_lft)
2660 {
2661 struct inet6_ifaddr *ifp;
2662 struct inet6_dev *idev;
2663 struct net_device *dev;
2664 unsigned long timeout;
2665 clock_t expires;
2666 int scope;
2667 u32 flags;
2668
2669 ASSERT_RTNL();
2670
2671 if (plen > 128)
2672 return -EINVAL;
2673
2674 /* check the lifetime */
2675 if (!valid_lft || prefered_lft > valid_lft)
2676 return -EINVAL;
2677
2678 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2679 return -EINVAL;
2680
2681 dev = __dev_get_by_index(net, ifindex);
2682 if (!dev)
2683 return -ENODEV;
2684
2685 idev = addrconf_add_dev(dev);
2686 if (IS_ERR(idev))
2687 return PTR_ERR(idev);
2688
2689 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2690 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2691 true, pfx, ifindex);
2692
2693 if (ret < 0)
2694 return ret;
2695 }
2696
2697 scope = ipv6_addr_scope(pfx);
2698
2699 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2700 if (addrconf_finite_timeout(timeout)) {
2701 expires = jiffies_to_clock_t(timeout * HZ);
2702 valid_lft = timeout;
2703 flags = RTF_EXPIRES;
2704 } else {
2705 expires = 0;
2706 flags = 0;
2707 ifa_flags |= IFA_F_PERMANENT;
2708 }
2709
2710 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2711 if (addrconf_finite_timeout(timeout)) {
2712 if (timeout == 0)
2713 ifa_flags |= IFA_F_DEPRECATED;
2714 prefered_lft = timeout;
2715 }
2716
2717 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2718 valid_lft, prefered_lft);
2719
2720 if (!IS_ERR(ifp)) {
2721 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2722 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2723 expires, flags);
2724 }
2725
2726 /*
2727 * Note that section 3.1 of RFC 4429 indicates
2728 * that the Optimistic flag should not be set for
2729 * manually configured addresses
2730 */
2731 addrconf_dad_start(ifp);
2732 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2733 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2734 true, jiffies);
2735 in6_ifa_put(ifp);
2736 addrconf_verify_rtnl();
2737 return 0;
2738 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2739 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2740 false, pfx, ifindex);
2741 }
2742
2743 return PTR_ERR(ifp);
2744 }
2745
2746 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2747 const struct in6_addr *pfx, unsigned int plen)
2748 {
2749 struct inet6_ifaddr *ifp;
2750 struct inet6_dev *idev;
2751 struct net_device *dev;
2752
2753 if (plen > 128)
2754 return -EINVAL;
2755
2756 dev = __dev_get_by_index(net, ifindex);
2757 if (!dev)
2758 return -ENODEV;
2759
2760 idev = __in6_dev_get(dev);
2761 if (!idev)
2762 return -ENXIO;
2763
2764 read_lock_bh(&idev->lock);
2765 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2766 if (ifp->prefix_len == plen &&
2767 ipv6_addr_equal(pfx, &ifp->addr)) {
2768 in6_ifa_hold(ifp);
2769 read_unlock_bh(&idev->lock);
2770
2771 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2772 (ifa_flags & IFA_F_MANAGETEMPADDR))
2773 manage_tempaddrs(idev, ifp, 0, 0, false,
2774 jiffies);
2775 ipv6_del_addr(ifp);
2776 addrconf_verify_rtnl();
2777 if (ipv6_addr_is_multicast(pfx)) {
2778 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2779 false, pfx, dev->ifindex);
2780 }
2781 return 0;
2782 }
2783 }
2784 read_unlock_bh(&idev->lock);
2785 return -EADDRNOTAVAIL;
2786 }
2787
2788
2789 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2790 {
2791 struct in6_ifreq ireq;
2792 int err;
2793
2794 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2795 return -EPERM;
2796
2797 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2798 return -EFAULT;
2799
2800 rtnl_lock();
2801 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2802 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2803 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2804 rtnl_unlock();
2805 return err;
2806 }
2807
2808 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2809 {
2810 struct in6_ifreq ireq;
2811 int err;
2812
2813 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2814 return -EPERM;
2815
2816 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2817 return -EFAULT;
2818
2819 rtnl_lock();
2820 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2821 ireq.ifr6_prefixlen);
2822 rtnl_unlock();
2823 return err;
2824 }
2825
2826 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2827 int plen, int scope)
2828 {
2829 struct inet6_ifaddr *ifp;
2830
2831 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2832 scope, IFA_F_PERMANENT,
2833 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2834 if (!IS_ERR(ifp)) {
2835 spin_lock_bh(&ifp->lock);
2836 ifp->flags &= ~IFA_F_TENTATIVE;
2837 spin_unlock_bh(&ifp->lock);
2838 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2839 in6_ifa_put(ifp);
2840 }
2841 }
2842
2843 #if IS_ENABLED(CONFIG_IPV6_SIT)
2844 static void sit_add_v4_addrs(struct inet6_dev *idev)
2845 {
2846 struct in6_addr addr;
2847 struct net_device *dev;
2848 struct net *net = dev_net(idev->dev);
2849 int scope, plen;
2850 u32 pflags = 0;
2851
2852 ASSERT_RTNL();
2853
2854 memset(&addr, 0, sizeof(struct in6_addr));
2855 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2856
2857 if (idev->dev->flags&IFF_POINTOPOINT) {
2858 addr.s6_addr32[0] = htonl(0xfe800000);
2859 scope = IFA_LINK;
2860 plen = 64;
2861 } else {
2862 scope = IPV6_ADDR_COMPATv4;
2863 plen = 96;
2864 pflags |= RTF_NONEXTHOP;
2865 }
2866
2867 if (addr.s6_addr32[3]) {
2868 add_addr(idev, &addr, plen, scope);
2869 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2870 return;
2871 }
2872
2873 for_each_netdev(net, dev) {
2874 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2875 if (in_dev && (dev->flags & IFF_UP)) {
2876 struct in_ifaddr *ifa;
2877
2878 int flag = scope;
2879
2880 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2881
2882 addr.s6_addr32[3] = ifa->ifa_local;
2883
2884 if (ifa->ifa_scope == RT_SCOPE_LINK)
2885 continue;
2886 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2887 if (idev->dev->flags&IFF_POINTOPOINT)
2888 continue;
2889 flag |= IFA_HOST;
2890 }
2891
2892 add_addr(idev, &addr, plen, flag);
2893 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2894 pflags);
2895 }
2896 }
2897 }
2898 }
2899 #endif
2900
2901 static void init_loopback(struct net_device *dev)
2902 {
2903 struct inet6_dev *idev;
2904 struct net_device *sp_dev;
2905 struct inet6_ifaddr *sp_ifa;
2906 struct rt6_info *sp_rt;
2907
2908 /* ::1 */
2909
2910 ASSERT_RTNL();
2911
2912 idev = ipv6_find_idev(dev);
2913 if (!idev) {
2914 pr_debug("%s: add_dev failed\n", __func__);
2915 return;
2916 }
2917
2918 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2919
2920 /* Add routes to other interface's IPv6 addresses */
2921 for_each_netdev(dev_net(dev), sp_dev) {
2922 if (!strcmp(sp_dev->name, dev->name))
2923 continue;
2924
2925 idev = __in6_dev_get(sp_dev);
2926 if (!idev)
2927 continue;
2928
2929 read_lock_bh(&idev->lock);
2930 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2931
2932 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2933 continue;
2934
2935 if (sp_ifa->rt) {
2936 /* This dst has been added to garbage list when
2937 * lo device down, release this obsolete dst and
2938 * reallocate a new router for ifa.
2939 */
2940 if (sp_ifa->rt->dst.obsolete > 0) {
2941 ip6_rt_put(sp_ifa->rt);
2942 sp_ifa->rt = NULL;
2943 } else {
2944 continue;
2945 }
2946 }
2947
2948 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2949
2950 /* Failure cases are ignored */
2951 if (!IS_ERR(sp_rt)) {
2952 sp_ifa->rt = sp_rt;
2953 ip6_ins_rt(sp_rt);
2954 }
2955 }
2956 read_unlock_bh(&idev->lock);
2957 }
2958 }
2959
2960 static void addrconf_add_linklocal(struct inet6_dev *idev,
2961 const struct in6_addr *addr, u32 flags)
2962 {
2963 struct inet6_ifaddr *ifp;
2964 u32 addr_flags = flags | IFA_F_PERMANENT;
2965
2966 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2967 if (idev->cnf.optimistic_dad &&
2968 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2969 addr_flags |= IFA_F_OPTIMISTIC;
2970 #endif
2971
2972 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2973 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2974 if (!IS_ERR(ifp)) {
2975 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2976 addrconf_dad_start(ifp);
2977 in6_ifa_put(ifp);
2978 }
2979 }
2980
2981 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2982 {
2983 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2984 return true;
2985
2986 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2987 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2988 return true;
2989
2990 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2991 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2992 return true;
2993
2994 return false;
2995 }
2996
2997 static int ipv6_generate_stable_address(struct in6_addr *address,
2998 u8 dad_count,
2999 const struct inet6_dev *idev)
3000 {
3001 static DEFINE_SPINLOCK(lock);
3002 static __u32 digest[SHA_DIGEST_WORDS];
3003 static __u32 workspace[SHA_WORKSPACE_WORDS];
3004
3005 static union {
3006 char __data[SHA_MESSAGE_BYTES];
3007 struct {
3008 struct in6_addr secret;
3009 __be32 prefix[2];
3010 unsigned char hwaddr[MAX_ADDR_LEN];
3011 u8 dad_count;
3012 } __packed;
3013 } data;
3014
3015 struct in6_addr secret;
3016 struct in6_addr temp;
3017 struct net *net = dev_net(idev->dev);
3018
3019 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3020
3021 if (idev->cnf.stable_secret.initialized)
3022 secret = idev->cnf.stable_secret.secret;
3023 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3024 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3025 else
3026 return -1;
3027
3028 retry:
3029 spin_lock_bh(&lock);
3030
3031 sha_init(digest);
3032 memset(&data, 0, sizeof(data));
3033 memset(workspace, 0, sizeof(workspace));
3034 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3035 data.prefix[0] = address->s6_addr32[0];
3036 data.prefix[1] = address->s6_addr32[1];
3037 data.secret = secret;
3038 data.dad_count = dad_count;
3039
3040 sha_transform(digest, data.__data, workspace);
3041
3042 temp = *address;
3043 temp.s6_addr32[2] = (__force __be32)digest[0];
3044 temp.s6_addr32[3] = (__force __be32)digest[1];
3045
3046 spin_unlock_bh(&lock);
3047
3048 if (ipv6_reserved_interfaceid(temp)) {
3049 dad_count++;
3050 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3051 return -1;
3052 goto retry;
3053 }
3054
3055 *address = temp;
3056 return 0;
3057 }
3058
3059 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3060 {
3061 struct in6_addr addr;
3062
3063 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3064
3065 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3066 if (!ipv6_generate_stable_address(&addr, 0, idev))
3067 addrconf_add_linklocal(idev, &addr,
3068 IFA_F_STABLE_PRIVACY);
3069 else if (prefix_route)
3070 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3071 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3072 /* addrconf_add_linklocal also adds a prefix_route and we
3073 * only need to care about prefix routes if ipv6_generate_eui64
3074 * couldn't generate one.
3075 */
3076 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3077 addrconf_add_linklocal(idev, &addr, 0);
3078 else if (prefix_route)
3079 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3080 }
3081 }
3082
3083 static void addrconf_dev_config(struct net_device *dev)
3084 {
3085 struct inet6_dev *idev;
3086
3087 ASSERT_RTNL();
3088
3089 if ((dev->type != ARPHRD_ETHER) &&
3090 (dev->type != ARPHRD_FDDI) &&
3091 (dev->type != ARPHRD_ARCNET) &&
3092 (dev->type != ARPHRD_INFINIBAND) &&
3093 (dev->type != ARPHRD_IEEE802154) &&
3094 (dev->type != ARPHRD_IEEE1394) &&
3095 (dev->type != ARPHRD_TUNNEL6) &&
3096 (dev->type != ARPHRD_6LOWPAN)) {
3097 /* Alas, we support only Ethernet autoconfiguration. */
3098 return;
3099 }
3100
3101 idev = addrconf_add_dev(dev);
3102 if (IS_ERR(idev))
3103 return;
3104
3105 addrconf_addr_gen(idev, false);
3106 }
3107
3108 #if IS_ENABLED(CONFIG_IPV6_SIT)
3109 static void addrconf_sit_config(struct net_device *dev)
3110 {
3111 struct inet6_dev *idev;
3112
3113 ASSERT_RTNL();
3114
3115 /*
3116 * Configure the tunnel with one of our IPv4
3117 * addresses... we should configure all of
3118 * our v4 addrs in the tunnel
3119 */
3120
3121 idev = ipv6_find_idev(dev);
3122 if (!idev) {
3123 pr_debug("%s: add_dev failed\n", __func__);
3124 return;
3125 }
3126
3127 if (dev->priv_flags & IFF_ISATAP) {
3128 addrconf_addr_gen(idev, false);
3129 return;
3130 }
3131
3132 sit_add_v4_addrs(idev);
3133
3134 if (dev->flags&IFF_POINTOPOINT)
3135 addrconf_add_mroute(dev);
3136 }
3137 #endif
3138
3139 #if IS_ENABLED(CONFIG_NET_IPGRE)
3140 static void addrconf_gre_config(struct net_device *dev)
3141 {
3142 struct inet6_dev *idev;
3143
3144 ASSERT_RTNL();
3145
3146 idev = ipv6_find_idev(dev);
3147 if (!idev) {
3148 pr_debug("%s: add_dev failed\n", __func__);
3149 return;
3150 }
3151
3152 addrconf_addr_gen(idev, true);
3153 }
3154 #endif
3155
3156 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3157 void *ptr)
3158 {
3159 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3160 struct inet6_dev *idev = __in6_dev_get(dev);
3161 int run_pending = 0;
3162 int err;
3163
3164 switch (event) {
3165 case NETDEV_REGISTER:
3166 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3167 idev = ipv6_add_dev(dev);
3168 if (IS_ERR(idev))
3169 return notifier_from_errno(PTR_ERR(idev));
3170 }
3171 break;
3172
3173 case NETDEV_UP:
3174 case NETDEV_CHANGE:
3175 if (dev->flags & IFF_SLAVE)
3176 break;
3177
3178 if (idev && idev->cnf.disable_ipv6)
3179 break;
3180
3181 if (event == NETDEV_UP) {
3182 if (!addrconf_qdisc_ok(dev)) {
3183 /* device is not ready yet. */
3184 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3185 dev->name);
3186 break;
3187 }
3188
3189 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3190 idev = ipv6_add_dev(dev);
3191
3192 if (!IS_ERR_OR_NULL(idev)) {
3193 idev->if_flags |= IF_READY;
3194 run_pending = 1;
3195 }
3196 } else {
3197 if (!addrconf_qdisc_ok(dev)) {
3198 /* device is still not ready. */
3199 break;
3200 }
3201
3202 if (idev) {
3203 if (idev->if_flags & IF_READY)
3204 /* device is already configured. */
3205 break;
3206 idev->if_flags |= IF_READY;
3207 }
3208
3209 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3210 dev->name);
3211
3212 run_pending = 1;
3213 }
3214
3215 switch (dev->type) {
3216 #if IS_ENABLED(CONFIG_IPV6_SIT)
3217 case ARPHRD_SIT:
3218 addrconf_sit_config(dev);
3219 break;
3220 #endif
3221 #if IS_ENABLED(CONFIG_NET_IPGRE)
3222 case ARPHRD_IPGRE:
3223 addrconf_gre_config(dev);
3224 break;
3225 #endif
3226 case ARPHRD_LOOPBACK:
3227 init_loopback(dev);
3228 break;
3229
3230 default:
3231 addrconf_dev_config(dev);
3232 break;
3233 }
3234
3235 if (!IS_ERR_OR_NULL(idev)) {
3236 if (run_pending)
3237 addrconf_dad_run(idev);
3238
3239 /*
3240 * If the MTU changed during the interface down,
3241 * when the interface up, the changed MTU must be
3242 * reflected in the idev as well as routers.
3243 */
3244 if (idev->cnf.mtu6 != dev->mtu &&
3245 dev->mtu >= IPV6_MIN_MTU) {
3246 rt6_mtu_change(dev, dev->mtu);
3247 idev->cnf.mtu6 = dev->mtu;
3248 }
3249 idev->tstamp = jiffies;
3250 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3251
3252 /*
3253 * If the changed mtu during down is lower than
3254 * IPV6_MIN_MTU stop IPv6 on this interface.
3255 */
3256 if (dev->mtu < IPV6_MIN_MTU)
3257 addrconf_ifdown(dev, 1);
3258 }
3259 break;
3260
3261 case NETDEV_CHANGEMTU:
3262 if (idev && dev->mtu >= IPV6_MIN_MTU) {
3263 rt6_mtu_change(dev, dev->mtu);
3264 idev->cnf.mtu6 = dev->mtu;
3265 break;
3266 }
3267
3268 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3269 idev = ipv6_add_dev(dev);
3270 if (!IS_ERR(idev))
3271 break;
3272 }
3273
3274 /*
3275 * if MTU under IPV6_MIN_MTU.
3276 * Stop IPv6 on this interface.
3277 */
3278
3279 case NETDEV_DOWN:
3280 case NETDEV_UNREGISTER:
3281 /*
3282 * Remove all addresses from this interface.
3283 */
3284 addrconf_ifdown(dev, event != NETDEV_DOWN);
3285 break;
3286
3287 case NETDEV_CHANGENAME:
3288 if (idev) {
3289 snmp6_unregister_dev(idev);
3290 addrconf_sysctl_unregister(idev);
3291 err = addrconf_sysctl_register(idev);
3292 if (err)
3293 return notifier_from_errno(err);
3294 err = snmp6_register_dev(idev);
3295 if (err) {
3296 addrconf_sysctl_unregister(idev);
3297 return notifier_from_errno(err);
3298 }
3299 }
3300 break;
3301
3302 case NETDEV_PRE_TYPE_CHANGE:
3303 case NETDEV_POST_TYPE_CHANGE:
3304 addrconf_type_change(dev, event);
3305 break;
3306 }
3307
3308 return NOTIFY_OK;
3309 }
3310
3311 /*
3312 * addrconf module should be notified of a device going up
3313 */
3314 static struct notifier_block ipv6_dev_notf = {
3315 .notifier_call = addrconf_notify,
3316 };
3317
3318 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3319 {
3320 struct inet6_dev *idev;
3321 ASSERT_RTNL();
3322
3323 idev = __in6_dev_get(dev);
3324
3325 if (event == NETDEV_POST_TYPE_CHANGE)
3326 ipv6_mc_remap(idev);
3327 else if (event == NETDEV_PRE_TYPE_CHANGE)
3328 ipv6_mc_unmap(idev);
3329 }
3330
3331 static int addrconf_ifdown(struct net_device *dev, int how)
3332 {
3333 struct net *net = dev_net(dev);
3334 struct inet6_dev *idev;
3335 struct inet6_ifaddr *ifa;
3336 int state, i;
3337
3338 ASSERT_RTNL();
3339
3340 rt6_ifdown(net, dev);
3341 neigh_ifdown(&nd_tbl, dev);
3342
3343 idev = __in6_dev_get(dev);
3344 if (!idev)
3345 return -ENODEV;
3346
3347 /*
3348 * Step 1: remove reference to ipv6 device from parent device.
3349 * Do not dev_put!
3350 */
3351 if (how) {
3352 idev->dead = 1;
3353
3354 /* protected by rtnl_lock */
3355 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3356
3357 /* Step 1.5: remove snmp6 entry */
3358 snmp6_unregister_dev(idev);
3359
3360 }
3361
3362 /* Step 2: clear hash table */
3363 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3364 struct hlist_head *h = &inet6_addr_lst[i];
3365
3366 spin_lock_bh(&addrconf_hash_lock);
3367 restart:
3368 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3369 if (ifa->idev == idev) {
3370 hlist_del_init_rcu(&ifa->addr_lst);
3371 addrconf_del_dad_work(ifa);
3372 goto restart;
3373 }
3374 }
3375 spin_unlock_bh(&addrconf_hash_lock);
3376 }
3377
3378 write_lock_bh(&idev->lock);
3379
3380 addrconf_del_rs_timer(idev);
3381
3382 /* Step 2: clear flags for stateless addrconf */
3383 if (!how)
3384 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3385
3386 if (how && del_timer(&idev->regen_timer))
3387 in6_dev_put(idev);
3388
3389 /* Step 3: clear tempaddr list */
3390 while (!list_empty(&idev->tempaddr_list)) {
3391 ifa = list_first_entry(&idev->tempaddr_list,
3392 struct inet6_ifaddr, tmp_list);
3393 list_del(&ifa->tmp_list);
3394 write_unlock_bh(&idev->lock);
3395 spin_lock_bh(&ifa->lock);
3396
3397 if (ifa->ifpub) {
3398 in6_ifa_put(ifa->ifpub);
3399 ifa->ifpub = NULL;
3400 }
3401 spin_unlock_bh(&ifa->lock);
3402 in6_ifa_put(ifa);
3403 write_lock_bh(&idev->lock);
3404 }
3405
3406 while (!list_empty(&idev->addr_list)) {
3407 ifa = list_first_entry(&idev->addr_list,
3408 struct inet6_ifaddr, if_list);
3409 addrconf_del_dad_work(ifa);
3410
3411 list_del(&ifa->if_list);
3412
3413 write_unlock_bh(&idev->lock);
3414
3415 spin_lock_bh(&ifa->lock);
3416 state = ifa->state;
3417 ifa->state = INET6_IFADDR_STATE_DEAD;
3418 spin_unlock_bh(&ifa->lock);
3419
3420 if (state != INET6_IFADDR_STATE_DEAD) {
3421 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3422 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3423 }
3424 in6_ifa_put(ifa);
3425
3426 write_lock_bh(&idev->lock);
3427 }
3428
3429 write_unlock_bh(&idev->lock);
3430
3431 /* Step 5: Discard anycast and multicast list */
3432 if (how) {
3433 ipv6_ac_destroy_dev(idev);
3434 ipv6_mc_destroy_dev(idev);
3435 } else {
3436 ipv6_mc_down(idev);
3437 }
3438
3439 idev->tstamp = jiffies;
3440
3441 /* Last: Shot the device (if unregistered) */
3442 if (how) {
3443 addrconf_sysctl_unregister(idev);
3444 neigh_parms_release(&nd_tbl, idev->nd_parms);
3445 neigh_ifdown(&nd_tbl, dev);
3446 in6_dev_put(idev);
3447 }
3448 return 0;
3449 }
3450
3451 static void addrconf_rs_timer(unsigned long data)
3452 {
3453 struct inet6_dev *idev = (struct inet6_dev *)data;
3454 struct net_device *dev = idev->dev;
3455 struct in6_addr lladdr;
3456
3457 write_lock(&idev->lock);
3458 if (idev->dead || !(idev->if_flags & IF_READY))
3459 goto out;
3460
3461 if (!ipv6_accept_ra(idev))
3462 goto out;
3463
3464 /* Announcement received after solicitation was sent */
3465 if (idev->if_flags & IF_RA_RCVD)
3466 goto out;
3467
3468 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3469 write_unlock(&idev->lock);
3470 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3471 ndisc_send_rs(dev, &lladdr,
3472 &in6addr_linklocal_allrouters);
3473 else
3474 goto put;
3475
3476 write_lock(&idev->lock);
3477 /* The wait after the last probe can be shorter */
3478 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3479 idev->cnf.rtr_solicits) ?
3480 idev->cnf.rtr_solicit_delay :
3481 idev->cnf.rtr_solicit_interval);
3482 } else {
3483 /*
3484 * Note: we do not support deprecated "all on-link"
3485 * assumption any longer.
3486 */
3487 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3488 }
3489
3490 out:
3491 write_unlock(&idev->lock);
3492 put:
3493 in6_dev_put(idev);
3494 }
3495
3496 /*
3497 * Duplicate Address Detection
3498 */
3499 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3500 {
3501 unsigned long rand_num;
3502 struct inet6_dev *idev = ifp->idev;
3503
3504 if (ifp->flags & IFA_F_OPTIMISTIC)
3505 rand_num = 0;
3506 else
3507 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3508
3509 ifp->dad_probes = idev->cnf.dad_transmits;
3510 addrconf_mod_dad_work(ifp, rand_num);
3511 }
3512
3513 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3514 {
3515 struct inet6_dev *idev = ifp->idev;
3516 struct net_device *dev = idev->dev;
3517
3518 addrconf_join_solict(dev, &ifp->addr);
3519
3520 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3521
3522 read_lock_bh(&idev->lock);
3523 spin_lock(&ifp->lock);
3524 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3525 goto out;
3526
3527 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3528 idev->cnf.accept_dad < 1 ||
3529 !(ifp->flags&IFA_F_TENTATIVE) ||
3530 ifp->flags & IFA_F_NODAD) {
3531 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3532 spin_unlock(&ifp->lock);
3533 read_unlock_bh(&idev->lock);
3534
3535 addrconf_dad_completed(ifp);
3536 return;
3537 }
3538
3539 if (!(idev->if_flags & IF_READY)) {
3540 spin_unlock(&ifp->lock);
3541 read_unlock_bh(&idev->lock);
3542 /*
3543 * If the device is not ready:
3544 * - keep it tentative if it is a permanent address.
3545 * - otherwise, kill it.
3546 */
3547 in6_ifa_hold(ifp);
3548 addrconf_dad_stop(ifp, 0);
3549 return;
3550 }
3551
3552 /*
3553 * Optimistic nodes can start receiving
3554 * Frames right away
3555 */
3556 if (ifp->flags & IFA_F_OPTIMISTIC) {
3557 ip6_ins_rt(ifp->rt);
3558 if (ipv6_use_optimistic_addr(idev)) {
3559 /* Because optimistic nodes can use this address,
3560 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3561 */
3562 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3563 }
3564 }
3565
3566 addrconf_dad_kick(ifp);
3567 out:
3568 spin_unlock(&ifp->lock);
3569 read_unlock_bh(&idev->lock);
3570 }
3571
3572 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3573 {
3574 bool begin_dad = false;
3575
3576 spin_lock_bh(&ifp->lock);
3577 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3578 ifp->state = INET6_IFADDR_STATE_PREDAD;
3579 begin_dad = true;
3580 }
3581 spin_unlock_bh(&ifp->lock);
3582
3583 if (begin_dad)
3584 addrconf_mod_dad_work(ifp, 0);
3585 }
3586
3587 static void addrconf_dad_work(struct work_struct *w)
3588 {
3589 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3590 struct inet6_ifaddr,
3591 dad_work);
3592 struct inet6_dev *idev = ifp->idev;
3593 struct in6_addr mcaddr;
3594
3595 enum {
3596 DAD_PROCESS,
3597 DAD_BEGIN,
3598 DAD_ABORT,
3599 } action = DAD_PROCESS;
3600
3601 rtnl_lock();
3602
3603 spin_lock_bh(&ifp->lock);
3604 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3605 action = DAD_BEGIN;
3606 ifp->state = INET6_IFADDR_STATE_DAD;
3607 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3608 action = DAD_ABORT;
3609 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3610 }
3611 spin_unlock_bh(&ifp->lock);
3612
3613 if (action == DAD_BEGIN) {
3614 addrconf_dad_begin(ifp);
3615 goto out;
3616 } else if (action == DAD_ABORT) {
3617 addrconf_dad_stop(ifp, 1);
3618 goto out;
3619 }
3620
3621 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3622 goto out;
3623
3624 write_lock_bh(&idev->lock);
3625 if (idev->dead || !(idev->if_flags & IF_READY)) {
3626 write_unlock_bh(&idev->lock);
3627 goto out;
3628 }
3629
3630 spin_lock(&ifp->lock);
3631 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3632 spin_unlock(&ifp->lock);
3633 write_unlock_bh(&idev->lock);
3634 goto out;
3635 }
3636
3637 if (ifp->dad_probes == 0) {
3638 /*
3639 * DAD was successful
3640 */
3641
3642 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3643 spin_unlock(&ifp->lock);
3644 write_unlock_bh(&idev->lock);
3645
3646 addrconf_dad_completed(ifp);
3647
3648 goto out;
3649 }
3650
3651 ifp->dad_probes--;
3652 addrconf_mod_dad_work(ifp,
3653 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3654 spin_unlock(&ifp->lock);
3655 write_unlock_bh(&idev->lock);
3656
3657 /* send a neighbour solicitation for our addr */
3658 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3659 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any, NULL);
3660 out:
3661 in6_ifa_put(ifp);
3662 rtnl_unlock();
3663 }
3664
3665 /* ifp->idev must be at least read locked */
3666 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3667 {
3668 struct inet6_ifaddr *ifpiter;
3669 struct inet6_dev *idev = ifp->idev;
3670
3671 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3672 if (ifpiter->scope > IFA_LINK)
3673 break;
3674 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3675 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3676 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3677 IFA_F_PERMANENT)
3678 return false;
3679 }
3680 return true;
3681 }
3682
3683 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3684 {
3685 struct net_device *dev = ifp->idev->dev;
3686 struct in6_addr lladdr;
3687 bool send_rs, send_mld;
3688
3689 addrconf_del_dad_work(ifp);
3690
3691 /*
3692 * Configure the address for reception. Now it is valid.
3693 */
3694
3695 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3696
3697 /* If added prefix is link local and we are prepared to process
3698 router advertisements, start sending router solicitations.
3699 */
3700
3701 read_lock_bh(&ifp->idev->lock);
3702 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3703 send_rs = send_mld &&
3704 ipv6_accept_ra(ifp->idev) &&
3705 ifp->idev->cnf.rtr_solicits > 0 &&
3706 (dev->flags&IFF_LOOPBACK) == 0;
3707 read_unlock_bh(&ifp->idev->lock);
3708
3709 /* While dad is in progress mld report's source address is in6_addrany.
3710 * Resend with proper ll now.
3711 */
3712 if (send_mld)
3713 ipv6_mc_dad_complete(ifp->idev);
3714
3715 if (send_rs) {
3716 /*
3717 * If a host as already performed a random delay
3718 * [...] as part of DAD [...] there is no need
3719 * to delay again before sending the first RS
3720 */
3721 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3722 return;
3723 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3724
3725 write_lock_bh(&ifp->idev->lock);
3726 spin_lock(&ifp->lock);
3727 ifp->idev->rs_probes = 1;
3728 ifp->idev->if_flags |= IF_RS_SENT;
3729 addrconf_mod_rs_timer(ifp->idev,
3730 ifp->idev->cnf.rtr_solicit_interval);
3731 spin_unlock(&ifp->lock);
3732 write_unlock_bh(&ifp->idev->lock);
3733 }
3734 }
3735
3736 static void addrconf_dad_run(struct inet6_dev *idev)
3737 {
3738 struct inet6_ifaddr *ifp;
3739
3740 read_lock_bh(&idev->lock);
3741 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3742 spin_lock(&ifp->lock);
3743 if (ifp->flags & IFA_F_TENTATIVE &&
3744 ifp->state == INET6_IFADDR_STATE_DAD)
3745 addrconf_dad_kick(ifp);
3746 spin_unlock(&ifp->lock);
3747 }
3748 read_unlock_bh(&idev->lock);
3749 }
3750
3751 #ifdef CONFIG_PROC_FS
3752 struct if6_iter_state {
3753 struct seq_net_private p;
3754 int bucket;
3755 int offset;
3756 };
3757
3758 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3759 {
3760 struct inet6_ifaddr *ifa = NULL;
3761 struct if6_iter_state *state = seq->private;
3762 struct net *net = seq_file_net(seq);
3763 int p = 0;
3764
3765 /* initial bucket if pos is 0 */
3766 if (pos == 0) {
3767 state->bucket = 0;
3768 state->offset = 0;
3769 }
3770
3771 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3772 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3773 addr_lst) {
3774 if (!net_eq(dev_net(ifa->idev->dev), net))
3775 continue;
3776 /* sync with offset */
3777 if (p < state->offset) {
3778 p++;
3779 continue;
3780 }
3781 state->offset++;
3782 return ifa;
3783 }
3784
3785 /* prepare for next bucket */
3786 state->offset = 0;
3787 p = 0;
3788 }
3789 return NULL;
3790 }
3791
3792 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3793 struct inet6_ifaddr *ifa)
3794 {
3795 struct if6_iter_state *state = seq->private;
3796 struct net *net = seq_file_net(seq);
3797
3798 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3799 if (!net_eq(dev_net(ifa->idev->dev), net))
3800 continue;
3801 state->offset++;
3802 return ifa;
3803 }
3804
3805 while (++state->bucket < IN6_ADDR_HSIZE) {
3806 state->offset = 0;
3807 hlist_for_each_entry_rcu_bh(ifa,
3808 &inet6_addr_lst[state->bucket], addr_lst) {
3809 if (!net_eq(dev_net(ifa->idev->dev), net))
3810 continue;
3811 state->offset++;
3812 return ifa;
3813 }
3814 }
3815
3816 return NULL;
3817 }
3818
3819 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3820 __acquires(rcu_bh)
3821 {
3822 rcu_read_lock_bh();
3823 return if6_get_first(seq, *pos);
3824 }
3825
3826 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3827 {
3828 struct inet6_ifaddr *ifa;
3829
3830 ifa = if6_get_next(seq, v);
3831 ++*pos;
3832 return ifa;
3833 }
3834
3835 static void if6_seq_stop(struct seq_file *seq, void *v)
3836 __releases(rcu_bh)
3837 {
3838 rcu_read_unlock_bh();
3839 }
3840
3841 static int if6_seq_show(struct seq_file *seq, void *v)
3842 {
3843 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3844 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3845 &ifp->addr,
3846 ifp->idev->dev->ifindex,
3847 ifp->prefix_len,
3848 ifp->scope,
3849 (u8) ifp->flags,
3850 ifp->idev->dev->name);
3851 return 0;
3852 }
3853
3854 static const struct seq_operations if6_seq_ops = {
3855 .start = if6_seq_start,
3856 .next = if6_seq_next,
3857 .show = if6_seq_show,
3858 .stop = if6_seq_stop,
3859 };
3860
3861 static int if6_seq_open(struct inode *inode, struct file *file)
3862 {
3863 return seq_open_net(inode, file, &if6_seq_ops,
3864 sizeof(struct if6_iter_state));
3865 }
3866
3867 static const struct file_operations if6_fops = {
3868 .owner = THIS_MODULE,
3869 .open = if6_seq_open,
3870 .read = seq_read,
3871 .llseek = seq_lseek,
3872 .release = seq_release_net,
3873 };
3874
3875 static int __net_init if6_proc_net_init(struct net *net)
3876 {
3877 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3878 return -ENOMEM;
3879 return 0;
3880 }
3881
3882 static void __net_exit if6_proc_net_exit(struct net *net)
3883 {
3884 remove_proc_entry("if_inet6", net->proc_net);
3885 }
3886
3887 static struct pernet_operations if6_proc_net_ops = {
3888 .init = if6_proc_net_init,
3889 .exit = if6_proc_net_exit,
3890 };
3891
3892 int __init if6_proc_init(void)
3893 {
3894 return register_pernet_subsys(&if6_proc_net_ops);
3895 }
3896
3897 void if6_proc_exit(void)
3898 {
3899 unregister_pernet_subsys(&if6_proc_net_ops);
3900 }
3901 #endif /* CONFIG_PROC_FS */
3902
3903 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3904 /* Check if address is a home address configured on any interface. */
3905 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3906 {
3907 int ret = 0;
3908 struct inet6_ifaddr *ifp = NULL;
3909 unsigned int hash = inet6_addr_hash(addr);
3910
3911 rcu_read_lock_bh();
3912 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3913 if (!net_eq(dev_net(ifp->idev->dev), net))
3914 continue;
3915 if (ipv6_addr_equal(&ifp->addr, addr) &&
3916 (ifp->flags & IFA_F_HOMEADDRESS)) {
3917 ret = 1;
3918 break;
3919 }
3920 }
3921 rcu_read_unlock_bh();
3922 return ret;
3923 }
3924 #endif
3925
3926 /*
3927 * Periodic address status verification
3928 */
3929
3930 static void addrconf_verify_rtnl(void)
3931 {
3932 unsigned long now, next, next_sec, next_sched;
3933 struct inet6_ifaddr *ifp;
3934 int i;
3935
3936 ASSERT_RTNL();
3937
3938 rcu_read_lock_bh();
3939 now = jiffies;
3940 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3941
3942 cancel_delayed_work(&addr_chk_work);
3943
3944 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3945 restart:
3946 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3947 unsigned long age;
3948
3949 /* When setting preferred_lft to a value not zero or
3950 * infinity, while valid_lft is infinity
3951 * IFA_F_PERMANENT has a non-infinity life time.
3952 */
3953 if ((ifp->flags & IFA_F_PERMANENT) &&
3954 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3955 continue;
3956
3957 spin_lock(&ifp->lock);
3958 /* We try to batch several events at once. */
3959 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3960
3961 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3962 age >= ifp->valid_lft) {
3963 spin_unlock(&ifp->lock);
3964 in6_ifa_hold(ifp);
3965 ipv6_del_addr(ifp);
3966 goto restart;
3967 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3968 spin_unlock(&ifp->lock);
3969 continue;
3970 } else if (age >= ifp->prefered_lft) {
3971 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3972 int deprecate = 0;
3973
3974 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3975 deprecate = 1;
3976 ifp->flags |= IFA_F_DEPRECATED;
3977 }
3978
3979 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3980 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3981 next = ifp->tstamp + ifp->valid_lft * HZ;
3982
3983 spin_unlock(&ifp->lock);
3984
3985 if (deprecate) {
3986 in6_ifa_hold(ifp);
3987
3988 ipv6_ifa_notify(0, ifp);
3989 in6_ifa_put(ifp);
3990 goto restart;
3991 }
3992 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3993 !(ifp->flags&IFA_F_TENTATIVE)) {
3994 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3995 ifp->idev->cnf.dad_transmits *
3996 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3997
3998 if (age >= ifp->prefered_lft - regen_advance) {
3999 struct inet6_ifaddr *ifpub = ifp->ifpub;
4000 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4001 next = ifp->tstamp + ifp->prefered_lft * HZ;
4002 if (!ifp->regen_count && ifpub) {
4003 ifp->regen_count++;
4004 in6_ifa_hold(ifp);
4005 in6_ifa_hold(ifpub);
4006 spin_unlock(&ifp->lock);
4007
4008 spin_lock(&ifpub->lock);
4009 ifpub->regen_count = 0;
4010 spin_unlock(&ifpub->lock);
4011 ipv6_create_tempaddr(ifpub, ifp);
4012 in6_ifa_put(ifpub);
4013 in6_ifa_put(ifp);
4014 goto restart;
4015 }
4016 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4017 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4018 spin_unlock(&ifp->lock);
4019 } else {
4020 /* ifp->prefered_lft <= ifp->valid_lft */
4021 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4022 next = ifp->tstamp + ifp->prefered_lft * HZ;
4023 spin_unlock(&ifp->lock);
4024 }
4025 }
4026 }
4027
4028 next_sec = round_jiffies_up(next);
4029 next_sched = next;
4030
4031 /* If rounded timeout is accurate enough, accept it. */
4032 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4033 next_sched = next_sec;
4034
4035 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4036 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4037 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4038
4039 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4040 now, next, next_sec, next_sched);
4041 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4042 rcu_read_unlock_bh();
4043 }
4044
4045 static void addrconf_verify_work(struct work_struct *w)
4046 {
4047 rtnl_lock();
4048 addrconf_verify_rtnl();
4049 rtnl_unlock();
4050 }
4051
4052 static void addrconf_verify(void)
4053 {
4054 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4055 }
4056
4057 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4058 struct in6_addr **peer_pfx)
4059 {
4060 struct in6_addr *pfx = NULL;
4061
4062 *peer_pfx = NULL;
4063
4064 if (addr)
4065 pfx = nla_data(addr);
4066
4067 if (local) {
4068 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4069 *peer_pfx = pfx;
4070 pfx = nla_data(local);
4071 }
4072
4073 return pfx;
4074 }
4075
4076 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4077 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4078 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4079 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4080 [IFA_FLAGS] = { .len = sizeof(u32) },
4081 };
4082
4083 static int
4084 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4085 {
4086 struct net *net = sock_net(skb->sk);
4087 struct ifaddrmsg *ifm;
4088 struct nlattr *tb[IFA_MAX+1];
4089 struct in6_addr *pfx, *peer_pfx;
4090 u32 ifa_flags;
4091 int err;
4092
4093 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4094 if (err < 0)
4095 return err;
4096
4097 ifm = nlmsg_data(nlh);
4098 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4099 if (!pfx)
4100 return -EINVAL;
4101
4102 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4103
4104 /* We ignore other flags so far. */
4105 ifa_flags &= IFA_F_MANAGETEMPADDR;
4106
4107 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4108 ifm->ifa_prefixlen);
4109 }
4110
4111 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4112 u32 prefered_lft, u32 valid_lft)
4113 {
4114 u32 flags;
4115 clock_t expires;
4116 unsigned long timeout;
4117 bool was_managetempaddr;
4118 bool had_prefixroute;
4119
4120 ASSERT_RTNL();
4121
4122 if (!valid_lft || (prefered_lft > valid_lft))
4123 return -EINVAL;
4124
4125 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4126 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4127 return -EINVAL;
4128
4129 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4130 if (addrconf_finite_timeout(timeout)) {
4131 expires = jiffies_to_clock_t(timeout * HZ);
4132 valid_lft = timeout;
4133 flags = RTF_EXPIRES;
4134 } else {
4135 expires = 0;
4136 flags = 0;
4137 ifa_flags |= IFA_F_PERMANENT;
4138 }
4139
4140 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4141 if (addrconf_finite_timeout(timeout)) {
4142 if (timeout == 0)
4143 ifa_flags |= IFA_F_DEPRECATED;
4144 prefered_lft = timeout;
4145 }
4146
4147 spin_lock_bh(&ifp->lock);
4148 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4149 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4150 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4151 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4152 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4153 IFA_F_NOPREFIXROUTE);
4154 ifp->flags |= ifa_flags;
4155 ifp->tstamp = jiffies;
4156 ifp->valid_lft = valid_lft;
4157 ifp->prefered_lft = prefered_lft;
4158
4159 spin_unlock_bh(&ifp->lock);
4160 if (!(ifp->flags&IFA_F_TENTATIVE))
4161 ipv6_ifa_notify(0, ifp);
4162
4163 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4164 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4165 expires, flags);
4166 } else if (had_prefixroute) {
4167 enum cleanup_prefix_rt_t action;
4168 unsigned long rt_expires;
4169
4170 write_lock_bh(&ifp->idev->lock);
4171 action = check_cleanup_prefix_route(ifp, &rt_expires);
4172 write_unlock_bh(&ifp->idev->lock);
4173
4174 if (action != CLEANUP_PREFIX_RT_NOP) {
4175 cleanup_prefix_route(ifp, rt_expires,
4176 action == CLEANUP_PREFIX_RT_DEL);
4177 }
4178 }
4179
4180 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4181 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4182 valid_lft = prefered_lft = 0;
4183 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4184 !was_managetempaddr, jiffies);
4185 }
4186
4187 addrconf_verify_rtnl();
4188
4189 return 0;
4190 }
4191
4192 static int
4193 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4194 {
4195 struct net *net = sock_net(skb->sk);
4196 struct ifaddrmsg *ifm;
4197 struct nlattr *tb[IFA_MAX+1];
4198 struct in6_addr *pfx, *peer_pfx;
4199 struct inet6_ifaddr *ifa;
4200 struct net_device *dev;
4201 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4202 u32 ifa_flags;
4203 int err;
4204
4205 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4206 if (err < 0)
4207 return err;
4208
4209 ifm = nlmsg_data(nlh);
4210 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4211 if (!pfx)
4212 return -EINVAL;
4213
4214 if (tb[IFA_CACHEINFO]) {
4215 struct ifa_cacheinfo *ci;
4216
4217 ci = nla_data(tb[IFA_CACHEINFO]);
4218 valid_lft = ci->ifa_valid;
4219 preferred_lft = ci->ifa_prefered;
4220 } else {
4221 preferred_lft = INFINITY_LIFE_TIME;
4222 valid_lft = INFINITY_LIFE_TIME;
4223 }
4224
4225 dev = __dev_get_by_index(net, ifm->ifa_index);
4226 if (!dev)
4227 return -ENODEV;
4228
4229 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4230
4231 /* We ignore other flags so far. */
4232 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4233 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4234
4235 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4236 if (!ifa) {
4237 /*
4238 * It would be best to check for !NLM_F_CREATE here but
4239 * userspace already relies on not having to provide this.
4240 */
4241 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4242 ifm->ifa_prefixlen, ifa_flags,
4243 preferred_lft, valid_lft);
4244 }
4245
4246 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4247 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4248 err = -EEXIST;
4249 else
4250 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4251
4252 in6_ifa_put(ifa);
4253
4254 return err;
4255 }
4256
4257 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4258 u8 scope, int ifindex)
4259 {
4260 struct ifaddrmsg *ifm;
4261
4262 ifm = nlmsg_data(nlh);
4263 ifm->ifa_family = AF_INET6;
4264 ifm->ifa_prefixlen = prefixlen;
4265 ifm->ifa_flags = flags;
4266 ifm->ifa_scope = scope;
4267 ifm->ifa_index = ifindex;
4268 }
4269
4270 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4271 unsigned long tstamp, u32 preferred, u32 valid)
4272 {
4273 struct ifa_cacheinfo ci;
4274
4275 ci.cstamp = cstamp_delta(cstamp);
4276 ci.tstamp = cstamp_delta(tstamp);
4277 ci.ifa_prefered = preferred;
4278 ci.ifa_valid = valid;
4279
4280 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4281 }
4282
4283 static inline int rt_scope(int ifa_scope)
4284 {
4285 if (ifa_scope & IFA_HOST)
4286 return RT_SCOPE_HOST;
4287 else if (ifa_scope & IFA_LINK)
4288 return RT_SCOPE_LINK;
4289 else if (ifa_scope & IFA_SITE)
4290 return RT_SCOPE_SITE;
4291 else
4292 return RT_SCOPE_UNIVERSE;
4293 }
4294
4295 static inline int inet6_ifaddr_msgsize(void)
4296 {
4297 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4298 + nla_total_size(16) /* IFA_LOCAL */
4299 + nla_total_size(16) /* IFA_ADDRESS */
4300 + nla_total_size(sizeof(struct ifa_cacheinfo))
4301 + nla_total_size(4) /* IFA_FLAGS */;
4302 }
4303
4304 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4305 u32 portid, u32 seq, int event, unsigned int flags)
4306 {
4307 struct nlmsghdr *nlh;
4308 u32 preferred, valid;
4309
4310 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4311 if (!nlh)
4312 return -EMSGSIZE;
4313
4314 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4315 ifa->idev->dev->ifindex);
4316
4317 if (!((ifa->flags&IFA_F_PERMANENT) &&
4318 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4319 preferred = ifa->prefered_lft;
4320 valid = ifa->valid_lft;
4321 if (preferred != INFINITY_LIFE_TIME) {
4322 long tval = (jiffies - ifa->tstamp)/HZ;
4323 if (preferred > tval)
4324 preferred -= tval;
4325 else
4326 preferred = 0;
4327 if (valid != INFINITY_LIFE_TIME) {
4328 if (valid > tval)
4329 valid -= tval;
4330 else
4331 valid = 0;
4332 }
4333 }
4334 } else {
4335 preferred = INFINITY_LIFE_TIME;
4336 valid = INFINITY_LIFE_TIME;
4337 }
4338
4339 if (!ipv6_addr_any(&ifa->peer_addr)) {
4340 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4341 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4342 goto error;
4343 } else
4344 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4345 goto error;
4346
4347 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4348 goto error;
4349
4350 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4351 goto error;
4352
4353 nlmsg_end(skb, nlh);
4354 return 0;
4355
4356 error:
4357 nlmsg_cancel(skb, nlh);
4358 return -EMSGSIZE;
4359 }
4360
4361 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4362 u32 portid, u32 seq, int event, u16 flags)
4363 {
4364 struct nlmsghdr *nlh;
4365 u8 scope = RT_SCOPE_UNIVERSE;
4366 int ifindex = ifmca->idev->dev->ifindex;
4367
4368 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4369 scope = RT_SCOPE_SITE;
4370
4371 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4372 if (!nlh)
4373 return -EMSGSIZE;
4374
4375 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4376 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4377 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4378 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4379 nlmsg_cancel(skb, nlh);
4380 return -EMSGSIZE;
4381 }
4382
4383 nlmsg_end(skb, nlh);
4384 return 0;
4385 }
4386
4387 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4388 u32 portid, u32 seq, int event, unsigned int flags)
4389 {
4390 struct nlmsghdr *nlh;
4391 u8 scope = RT_SCOPE_UNIVERSE;
4392 int ifindex = ifaca->aca_idev->dev->ifindex;
4393
4394 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4395 scope = RT_SCOPE_SITE;
4396
4397 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4398 if (!nlh)
4399 return -EMSGSIZE;
4400
4401 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4402 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4403 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4404 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4405 nlmsg_cancel(skb, nlh);
4406 return -EMSGSIZE;
4407 }
4408
4409 nlmsg_end(skb, nlh);
4410 return 0;
4411 }
4412
4413 enum addr_type_t {
4414 UNICAST_ADDR,
4415 MULTICAST_ADDR,
4416 ANYCAST_ADDR,
4417 };
4418
4419 /* called with rcu_read_lock() */
4420 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4421 struct netlink_callback *cb, enum addr_type_t type,
4422 int s_ip_idx, int *p_ip_idx)
4423 {
4424 struct ifmcaddr6 *ifmca;
4425 struct ifacaddr6 *ifaca;
4426 int err = 1;
4427 int ip_idx = *p_ip_idx;
4428
4429 read_lock_bh(&idev->lock);
4430 switch (type) {
4431 case UNICAST_ADDR: {
4432 struct inet6_ifaddr *ifa;
4433
4434 /* unicast address incl. temp addr */
4435 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4436 if (++ip_idx < s_ip_idx)
4437 continue;
4438 err = inet6_fill_ifaddr(skb, ifa,
4439 NETLINK_CB(cb->skb).portid,
4440 cb->nlh->nlmsg_seq,
4441 RTM_NEWADDR,
4442 NLM_F_MULTI);
4443 if (err < 0)
4444 break;
4445 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4446 }
4447 break;
4448 }
4449 case MULTICAST_ADDR:
4450 /* multicast address */
4451 for (ifmca = idev->mc_list; ifmca;
4452 ifmca = ifmca->next, ip_idx++) {
4453 if (ip_idx < s_ip_idx)
4454 continue;
4455 err = inet6_fill_ifmcaddr(skb, ifmca,
4456 NETLINK_CB(cb->skb).portid,
4457 cb->nlh->nlmsg_seq,
4458 RTM_GETMULTICAST,
4459 NLM_F_MULTI);
4460 if (err < 0)
4461 break;
4462 }
4463 break;
4464 case ANYCAST_ADDR:
4465 /* anycast address */
4466 for (ifaca = idev->ac_list; ifaca;
4467 ifaca = ifaca->aca_next, ip_idx++) {
4468 if (ip_idx < s_ip_idx)
4469 continue;
4470 err = inet6_fill_ifacaddr(skb, ifaca,
4471 NETLINK_CB(cb->skb).portid,
4472 cb->nlh->nlmsg_seq,
4473 RTM_GETANYCAST,
4474 NLM_F_MULTI);
4475 if (err < 0)
4476 break;
4477 }
4478 break;
4479 default:
4480 break;
4481 }
4482 read_unlock_bh(&idev->lock);
4483 *p_ip_idx = ip_idx;
4484 return err;
4485 }
4486
4487 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4488 enum addr_type_t type)
4489 {
4490 struct net *net = sock_net(skb->sk);
4491 int h, s_h;
4492 int idx, ip_idx;
4493 int s_idx, s_ip_idx;
4494 struct net_device *dev;
4495 struct inet6_dev *idev;
4496 struct hlist_head *head;
4497
4498 s_h = cb->args[0];
4499 s_idx = idx = cb->args[1];
4500 s_ip_idx = ip_idx = cb->args[2];
4501
4502 rcu_read_lock();
4503 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4504 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4505 idx = 0;
4506 head = &net->dev_index_head[h];
4507 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4508 if (idx < s_idx)
4509 goto cont;
4510 if (h > s_h || idx > s_idx)
4511 s_ip_idx = 0;
4512 ip_idx = 0;
4513 idev = __in6_dev_get(dev);
4514 if (!idev)
4515 goto cont;
4516
4517 if (in6_dump_addrs(idev, skb, cb, type,
4518 s_ip_idx, &ip_idx) < 0)
4519 goto done;
4520 cont:
4521 idx++;
4522 }
4523 }
4524 done:
4525 rcu_read_unlock();
4526 cb->args[0] = h;
4527 cb->args[1] = idx;
4528 cb->args[2] = ip_idx;
4529
4530 return skb->len;
4531 }
4532
4533 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4534 {
4535 enum addr_type_t type = UNICAST_ADDR;
4536
4537 return inet6_dump_addr(skb, cb, type);
4538 }
4539
4540 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4541 {
4542 enum addr_type_t type = MULTICAST_ADDR;
4543
4544 return inet6_dump_addr(skb, cb, type);
4545 }
4546
4547
4548 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4549 {
4550 enum addr_type_t type = ANYCAST_ADDR;
4551
4552 return inet6_dump_addr(skb, cb, type);
4553 }
4554
4555 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4556 {
4557 struct net *net = sock_net(in_skb->sk);
4558 struct ifaddrmsg *ifm;
4559 struct nlattr *tb[IFA_MAX+1];
4560 struct in6_addr *addr = NULL, *peer;
4561 struct net_device *dev = NULL;
4562 struct inet6_ifaddr *ifa;
4563 struct sk_buff *skb;
4564 int err;
4565
4566 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4567 if (err < 0)
4568 goto errout;
4569
4570 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4571 if (!addr) {
4572 err = -EINVAL;
4573 goto errout;
4574 }
4575
4576 ifm = nlmsg_data(nlh);
4577 if (ifm->ifa_index)
4578 dev = __dev_get_by_index(net, ifm->ifa_index);
4579
4580 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4581 if (!ifa) {
4582 err = -EADDRNOTAVAIL;
4583 goto errout;
4584 }
4585
4586 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4587 if (!skb) {
4588 err = -ENOBUFS;
4589 goto errout_ifa;
4590 }
4591
4592 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4593 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4594 if (err < 0) {
4595 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4596 WARN_ON(err == -EMSGSIZE);
4597 kfree_skb(skb);
4598 goto errout_ifa;
4599 }
4600 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4601 errout_ifa:
4602 in6_ifa_put(ifa);
4603 errout:
4604 return err;
4605 }
4606
4607 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4608 {
4609 struct sk_buff *skb;
4610 struct net *net = dev_net(ifa->idev->dev);
4611 int err = -ENOBUFS;
4612
4613 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4614 if (!skb)
4615 goto errout;
4616
4617 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4618 if (err < 0) {
4619 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4620 WARN_ON(err == -EMSGSIZE);
4621 kfree_skb(skb);
4622 goto errout;
4623 }
4624 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4625 return;
4626 errout:
4627 if (err < 0)
4628 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4629 }
4630
4631 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4632 __s32 *array, int bytes)
4633 {
4634 BUG_ON(bytes < (DEVCONF_MAX * 4));
4635
4636 memset(array, 0, bytes);
4637 array[DEVCONF_FORWARDING] = cnf->forwarding;
4638 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4639 array[DEVCONF_MTU6] = cnf->mtu6;
4640 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4641 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4642 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4643 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4644 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4645 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4646 jiffies_to_msecs(cnf->rtr_solicit_interval);
4647 array[DEVCONF_RTR_SOLICIT_DELAY] =
4648 jiffies_to_msecs(cnf->rtr_solicit_delay);
4649 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4650 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4651 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4652 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4653 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4654 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4655 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4656 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4657 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4658 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4659 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4660 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4661 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4662 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4663 #ifdef CONFIG_IPV6_ROUTER_PREF
4664 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4665 array[DEVCONF_RTR_PROBE_INTERVAL] =
4666 jiffies_to_msecs(cnf->rtr_probe_interval);
4667 #ifdef CONFIG_IPV6_ROUTE_INFO
4668 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4669 #endif
4670 #endif
4671 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4672 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4673 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4674 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4675 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4676 #endif
4677 #ifdef CONFIG_IPV6_MROUTE
4678 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4679 #endif
4680 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4681 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4682 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4683 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4684 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4685 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4686 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4687 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4688 /* we omit DEVCONF_STABLE_SECRET for now */
4689 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4690 }
4691
4692 static inline size_t inet6_ifla6_size(void)
4693 {
4694 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4695 + nla_total_size(sizeof(struct ifla_cacheinfo))
4696 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4697 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4698 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4699 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4700 }
4701
4702 static inline size_t inet6_if_nlmsg_size(void)
4703 {
4704 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4705 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4706 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4707 + nla_total_size(4) /* IFLA_MTU */
4708 + nla_total_size(4) /* IFLA_LINK */
4709 + nla_total_size(1) /* IFLA_OPERSTATE */
4710 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4711 }
4712
4713 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4714 int items, int bytes)
4715 {
4716 int i;
4717 int pad = bytes - sizeof(u64) * items;
4718 BUG_ON(pad < 0);
4719
4720 /* Use put_unaligned() because stats may not be aligned for u64. */
4721 put_unaligned(items, &stats[0]);
4722 for (i = 1; i < items; i++)
4723 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4724
4725 memset(&stats[items], 0, pad);
4726 }
4727
4728 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4729 int items, int bytes, size_t syncpoff)
4730 {
4731 int i;
4732 int pad = bytes - sizeof(u64) * items;
4733 BUG_ON(pad < 0);
4734
4735 /* Use put_unaligned() because stats may not be aligned for u64. */
4736 put_unaligned(items, &stats[0]);
4737 for (i = 1; i < items; i++)
4738 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4739
4740 memset(&stats[items], 0, pad);
4741 }
4742
4743 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4744 int bytes)
4745 {
4746 switch (attrtype) {
4747 case IFLA_INET6_STATS:
4748 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4749 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4750 break;
4751 case IFLA_INET6_ICMP6STATS:
4752 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4753 break;
4754 }
4755 }
4756
4757 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4758 {
4759 struct nlattr *nla;
4760 struct ifla_cacheinfo ci;
4761
4762 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4763 goto nla_put_failure;
4764 ci.max_reasm_len = IPV6_MAXPLEN;
4765 ci.tstamp = cstamp_delta(idev->tstamp);
4766 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4767 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4768 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4769 goto nla_put_failure;
4770 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4771 if (!nla)
4772 goto nla_put_failure;
4773 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4774
4775 /* XXX - MC not implemented */
4776
4777 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4778 if (!nla)
4779 goto nla_put_failure;
4780 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4781
4782 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4783 if (!nla)
4784 goto nla_put_failure;
4785 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4786
4787 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4788 if (!nla)
4789 goto nla_put_failure;
4790
4791 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4792 goto nla_put_failure;
4793
4794 read_lock_bh(&idev->lock);
4795 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4796 read_unlock_bh(&idev->lock);
4797
4798 return 0;
4799
4800 nla_put_failure:
4801 return -EMSGSIZE;
4802 }
4803
4804 static size_t inet6_get_link_af_size(const struct net_device *dev)
4805 {
4806 if (!__in6_dev_get(dev))
4807 return 0;
4808
4809 return inet6_ifla6_size();
4810 }
4811
4812 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4813 {
4814 struct inet6_dev *idev = __in6_dev_get(dev);
4815
4816 if (!idev)
4817 return -ENODATA;
4818
4819 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4820 return -EMSGSIZE;
4821
4822 return 0;
4823 }
4824
4825 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4826 {
4827 struct inet6_ifaddr *ifp;
4828 struct net_device *dev = idev->dev;
4829 bool update_rs = false;
4830 struct in6_addr ll_addr;
4831
4832 ASSERT_RTNL();
4833
4834 if (!token)
4835 return -EINVAL;
4836 if (ipv6_addr_any(token))
4837 return -EINVAL;
4838 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4839 return -EINVAL;
4840 if (!ipv6_accept_ra(idev))
4841 return -EINVAL;
4842 if (idev->cnf.rtr_solicits <= 0)
4843 return -EINVAL;
4844
4845 write_lock_bh(&idev->lock);
4846
4847 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4848 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4849
4850 write_unlock_bh(&idev->lock);
4851
4852 if (!idev->dead && (idev->if_flags & IF_READY) &&
4853 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4854 IFA_F_OPTIMISTIC)) {
4855
4856 /* If we're not ready, then normal ifup will take care
4857 * of this. Otherwise, we need to request our rs here.
4858 */
4859 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4860 update_rs = true;
4861 }
4862
4863 write_lock_bh(&idev->lock);
4864
4865 if (update_rs) {
4866 idev->if_flags |= IF_RS_SENT;
4867 idev->rs_probes = 1;
4868 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4869 }
4870
4871 /* Well, that's kinda nasty ... */
4872 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4873 spin_lock(&ifp->lock);
4874 if (ifp->tokenized) {
4875 ifp->valid_lft = 0;
4876 ifp->prefered_lft = 0;
4877 }
4878 spin_unlock(&ifp->lock);
4879 }
4880
4881 write_unlock_bh(&idev->lock);
4882 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4883 addrconf_verify_rtnl();
4884 return 0;
4885 }
4886
4887 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4888 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4889 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4890 };
4891
4892 static int inet6_validate_link_af(const struct net_device *dev,
4893 const struct nlattr *nla)
4894 {
4895 struct nlattr *tb[IFLA_INET6_MAX + 1];
4896
4897 if (dev && !__in6_dev_get(dev))
4898 return -EAFNOSUPPORT;
4899
4900 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4901 }
4902
4903 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4904 {
4905 int err = -EINVAL;
4906 struct inet6_dev *idev = __in6_dev_get(dev);
4907 struct nlattr *tb[IFLA_INET6_MAX + 1];
4908
4909 if (!idev)
4910 return -EAFNOSUPPORT;
4911
4912 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4913 BUG();
4914
4915 if (tb[IFLA_INET6_TOKEN]) {
4916 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4917 if (err)
4918 return err;
4919 }
4920
4921 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4922 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4923
4924 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4925 mode != IN6_ADDR_GEN_MODE_NONE &&
4926 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4927 return -EINVAL;
4928
4929 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4930 !idev->cnf.stable_secret.initialized &&
4931 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4932 return -EINVAL;
4933
4934 idev->addr_gen_mode = mode;
4935 err = 0;
4936 }
4937
4938 return err;
4939 }
4940
4941 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4942 u32 portid, u32 seq, int event, unsigned int flags)
4943 {
4944 struct net_device *dev = idev->dev;
4945 struct ifinfomsg *hdr;
4946 struct nlmsghdr *nlh;
4947 void *protoinfo;
4948
4949 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4950 if (!nlh)
4951 return -EMSGSIZE;
4952
4953 hdr = nlmsg_data(nlh);
4954 hdr->ifi_family = AF_INET6;
4955 hdr->__ifi_pad = 0;
4956 hdr->ifi_type = dev->type;
4957 hdr->ifi_index = dev->ifindex;
4958 hdr->ifi_flags = dev_get_flags(dev);
4959 hdr->ifi_change = 0;
4960
4961 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4962 (dev->addr_len &&
4963 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4964 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4965 (dev->ifindex != dev_get_iflink(dev) &&
4966 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
4967 nla_put_u8(skb, IFLA_OPERSTATE,
4968 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
4969 goto nla_put_failure;
4970 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4971 if (!protoinfo)
4972 goto nla_put_failure;
4973
4974 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4975 goto nla_put_failure;
4976
4977 nla_nest_end(skb, protoinfo);
4978 nlmsg_end(skb, nlh);
4979 return 0;
4980
4981 nla_put_failure:
4982 nlmsg_cancel(skb, nlh);
4983 return -EMSGSIZE;
4984 }
4985
4986 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4987 {
4988 struct net *net = sock_net(skb->sk);
4989 int h, s_h;
4990 int idx = 0, s_idx;
4991 struct net_device *dev;
4992 struct inet6_dev *idev;
4993 struct hlist_head *head;
4994
4995 s_h = cb->args[0];
4996 s_idx = cb->args[1];
4997
4998 rcu_read_lock();
4999 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5000 idx = 0;
5001 head = &net->dev_index_head[h];
5002 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5003 if (idx < s_idx)
5004 goto cont;
5005 idev = __in6_dev_get(dev);
5006 if (!idev)
5007 goto cont;
5008 if (inet6_fill_ifinfo(skb, idev,
5009 NETLINK_CB(cb->skb).portid,
5010 cb->nlh->nlmsg_seq,
5011 RTM_NEWLINK, NLM_F_MULTI) < 0)
5012 goto out;
5013 cont:
5014 idx++;
5015 }
5016 }
5017 out:
5018 rcu_read_unlock();
5019 cb->args[1] = idx;
5020 cb->args[0] = h;
5021
5022 return skb->len;
5023 }
5024
5025 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5026 {
5027 struct sk_buff *skb;
5028 struct net *net = dev_net(idev->dev);
5029 int err = -ENOBUFS;
5030
5031 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5032 if (!skb)
5033 goto errout;
5034
5035 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5036 if (err < 0) {
5037 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5038 WARN_ON(err == -EMSGSIZE);
5039 kfree_skb(skb);
5040 goto errout;
5041 }
5042 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5043 return;
5044 errout:
5045 if (err < 0)
5046 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5047 }
5048
5049 static inline size_t inet6_prefix_nlmsg_size(void)
5050 {
5051 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5052 + nla_total_size(sizeof(struct in6_addr))
5053 + nla_total_size(sizeof(struct prefix_cacheinfo));
5054 }
5055
5056 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5057 struct prefix_info *pinfo, u32 portid, u32 seq,
5058 int event, unsigned int flags)
5059 {
5060 struct prefixmsg *pmsg;
5061 struct nlmsghdr *nlh;
5062 struct prefix_cacheinfo ci;
5063
5064 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5065 if (!nlh)
5066 return -EMSGSIZE;
5067
5068 pmsg = nlmsg_data(nlh);
5069 pmsg->prefix_family = AF_INET6;
5070 pmsg->prefix_pad1 = 0;
5071 pmsg->prefix_pad2 = 0;
5072 pmsg->prefix_ifindex = idev->dev->ifindex;
5073 pmsg->prefix_len = pinfo->prefix_len;
5074 pmsg->prefix_type = pinfo->type;
5075 pmsg->prefix_pad3 = 0;
5076 pmsg->prefix_flags = 0;
5077 if (pinfo->onlink)
5078 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5079 if (pinfo->autoconf)
5080 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5081
5082 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5083 goto nla_put_failure;
5084 ci.preferred_time = ntohl(pinfo->prefered);
5085 ci.valid_time = ntohl(pinfo->valid);
5086 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5087 goto nla_put_failure;
5088 nlmsg_end(skb, nlh);
5089 return 0;
5090
5091 nla_put_failure:
5092 nlmsg_cancel(skb, nlh);
5093 return -EMSGSIZE;
5094 }
5095
5096 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5097 struct prefix_info *pinfo)
5098 {
5099 struct sk_buff *skb;
5100 struct net *net = dev_net(idev->dev);
5101 int err = -ENOBUFS;
5102
5103 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5104 if (!skb)
5105 goto errout;
5106
5107 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5108 if (err < 0) {
5109 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5110 WARN_ON(err == -EMSGSIZE);
5111 kfree_skb(skb);
5112 goto errout;
5113 }
5114 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5115 return;
5116 errout:
5117 if (err < 0)
5118 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5119 }
5120
5121 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5122 {
5123 struct net *net = dev_net(ifp->idev->dev);
5124
5125 if (event)
5126 ASSERT_RTNL();
5127
5128 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5129
5130 switch (event) {
5131 case RTM_NEWADDR:
5132 /*
5133 * If the address was optimistic
5134 * we inserted the route at the start of
5135 * our DAD process, so we don't need
5136 * to do it again
5137 */
5138 if (!(ifp->rt->rt6i_node))
5139 ip6_ins_rt(ifp->rt);
5140 if (ifp->idev->cnf.forwarding)
5141 addrconf_join_anycast(ifp);
5142 if (!ipv6_addr_any(&ifp->peer_addr))
5143 addrconf_prefix_route(&ifp->peer_addr, 128,
5144 ifp->idev->dev, 0, 0);
5145 break;
5146 case RTM_DELADDR:
5147 if (ifp->idev->cnf.forwarding)
5148 addrconf_leave_anycast(ifp);
5149 addrconf_leave_solict(ifp->idev, &ifp->addr);
5150 if (!ipv6_addr_any(&ifp->peer_addr)) {
5151 struct rt6_info *rt;
5152
5153 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5154 ifp->idev->dev, 0, 0);
5155 if (rt && ip6_del_rt(rt))
5156 dst_free(&rt->dst);
5157 }
5158 dst_hold(&ifp->rt->dst);
5159
5160 if (ip6_del_rt(ifp->rt))
5161 dst_free(&ifp->rt->dst);
5162
5163 rt_genid_bump_ipv6(net);
5164 break;
5165 }
5166 atomic_inc(&net->ipv6.dev_addr_genid);
5167 }
5168
5169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5170 {
5171 rcu_read_lock_bh();
5172 if (likely(ifp->idev->dead == 0))
5173 __ipv6_ifa_notify(event, ifp);
5174 rcu_read_unlock_bh();
5175 }
5176
5177 #ifdef CONFIG_SYSCTL
5178
5179 static
5180 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5181 void __user *buffer, size_t *lenp, loff_t *ppos)
5182 {
5183 int *valp = ctl->data;
5184 int val = *valp;
5185 loff_t pos = *ppos;
5186 struct ctl_table lctl;
5187 int ret;
5188
5189 /*
5190 * ctl->data points to idev->cnf.forwarding, we should
5191 * not modify it until we get the rtnl lock.
5192 */
5193 lctl = *ctl;
5194 lctl.data = &val;
5195
5196 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5197
5198 if (write)
5199 ret = addrconf_fixup_forwarding(ctl, valp, val);
5200 if (ret)
5201 *ppos = pos;
5202 return ret;
5203 }
5204
5205 static
5206 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5207 void __user *buffer, size_t *lenp, loff_t *ppos)
5208 {
5209 struct inet6_dev *idev = ctl->extra1;
5210 int min_mtu = IPV6_MIN_MTU;
5211 struct ctl_table lctl;
5212
5213 lctl = *ctl;
5214 lctl.extra1 = &min_mtu;
5215 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5216
5217 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5218 }
5219
5220 static void dev_disable_change(struct inet6_dev *idev)
5221 {
5222 struct netdev_notifier_info info;
5223
5224 if (!idev || !idev->dev)
5225 return;
5226
5227 netdev_notifier_info_init(&info, idev->dev);
5228 if (idev->cnf.disable_ipv6)
5229 addrconf_notify(NULL, NETDEV_DOWN, &info);
5230 else
5231 addrconf_notify(NULL, NETDEV_UP, &info);
5232 }
5233
5234 static void addrconf_disable_change(struct net *net, __s32 newf)
5235 {
5236 struct net_device *dev;
5237 struct inet6_dev *idev;
5238
5239 rcu_read_lock();
5240 for_each_netdev_rcu(net, dev) {
5241 idev = __in6_dev_get(dev);
5242 if (idev) {
5243 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5244 idev->cnf.disable_ipv6 = newf;
5245 if (changed)
5246 dev_disable_change(idev);
5247 }
5248 }
5249 rcu_read_unlock();
5250 }
5251
5252 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5253 {
5254 struct net *net;
5255 int old;
5256
5257 if (!rtnl_trylock())
5258 return restart_syscall();
5259
5260 net = (struct net *)table->extra2;
5261 old = *p;
5262 *p = newf;
5263
5264 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5265 rtnl_unlock();
5266 return 0;
5267 }
5268
5269 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5270 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5271 addrconf_disable_change(net, newf);
5272 } else if ((!newf) ^ (!old))
5273 dev_disable_change((struct inet6_dev *)table->extra1);
5274
5275 rtnl_unlock();
5276 return 0;
5277 }
5278
5279 static
5280 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5281 void __user *buffer, size_t *lenp, loff_t *ppos)
5282 {
5283 int *valp = ctl->data;
5284 int val = *valp;
5285 loff_t pos = *ppos;
5286 struct ctl_table lctl;
5287 int ret;
5288
5289 /*
5290 * ctl->data points to idev->cnf.disable_ipv6, we should
5291 * not modify it until we get the rtnl lock.
5292 */
5293 lctl = *ctl;
5294 lctl.data = &val;
5295
5296 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5297
5298 if (write)
5299 ret = addrconf_disable_ipv6(ctl, valp, val);
5300 if (ret)
5301 *ppos = pos;
5302 return ret;
5303 }
5304
5305 static
5306 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5307 void __user *buffer, size_t *lenp, loff_t *ppos)
5308 {
5309 int *valp = ctl->data;
5310 int ret;
5311 int old, new;
5312
5313 old = *valp;
5314 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5315 new = *valp;
5316
5317 if (write && old != new) {
5318 struct net *net = ctl->extra2;
5319
5320 if (!rtnl_trylock())
5321 return restart_syscall();
5322
5323 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5324 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5325 NETCONFA_IFINDEX_DEFAULT,
5326 net->ipv6.devconf_dflt);
5327 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5328 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5329 NETCONFA_IFINDEX_ALL,
5330 net->ipv6.devconf_all);
5331 else {
5332 struct inet6_dev *idev = ctl->extra1;
5333
5334 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5335 idev->dev->ifindex,
5336 &idev->cnf);
5337 }
5338 rtnl_unlock();
5339 }
5340
5341 return ret;
5342 }
5343
5344 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5345 void __user *buffer, size_t *lenp,
5346 loff_t *ppos)
5347 {
5348 int err;
5349 struct in6_addr addr;
5350 char str[IPV6_MAX_STRLEN];
5351 struct ctl_table lctl = *ctl;
5352 struct net *net = ctl->extra2;
5353 struct ipv6_stable_secret *secret = ctl->data;
5354
5355 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5356 return -EIO;
5357
5358 lctl.maxlen = IPV6_MAX_STRLEN;
5359 lctl.data = str;
5360
5361 if (!rtnl_trylock())
5362 return restart_syscall();
5363
5364 if (!write && !secret->initialized) {
5365 err = -EIO;
5366 goto out;
5367 }
5368
5369 if (!write) {
5370 err = snprintf(str, sizeof(str), "%pI6",
5371 &secret->secret);
5372 if (err >= sizeof(str)) {
5373 err = -EIO;
5374 goto out;
5375 }
5376 }
5377
5378 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5379 if (err || !write)
5380 goto out;
5381
5382 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5383 err = -EIO;
5384 goto out;
5385 }
5386
5387 secret->initialized = true;
5388 secret->secret = addr;
5389
5390 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5391 struct net_device *dev;
5392
5393 for_each_netdev(net, dev) {
5394 struct inet6_dev *idev = __in6_dev_get(dev);
5395
5396 if (idev) {
5397 idev->addr_gen_mode =
5398 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5399 }
5400 }
5401 } else {
5402 struct inet6_dev *idev = ctl->extra1;
5403
5404 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5405 }
5406
5407 out:
5408 rtnl_unlock();
5409
5410 return err;
5411 }
5412
5413 static
5414 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5415 int write,
5416 void __user *buffer,
5417 size_t *lenp,
5418 loff_t *ppos)
5419 {
5420 int *valp = ctl->data;
5421 int val = *valp;
5422 loff_t pos = *ppos;
5423 struct ctl_table lctl;
5424 int ret;
5425
5426 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5427 * we should not modify it until we get the rtnl lock.
5428 */
5429 lctl = *ctl;
5430 lctl.data = &val;
5431
5432 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5433
5434 if (write)
5435 ret = addrconf_fixup_linkdown(ctl, valp, val);
5436 if (ret)
5437 *ppos = pos;
5438 return ret;
5439 }
5440
5441 static struct addrconf_sysctl_table
5442 {
5443 struct ctl_table_header *sysctl_header;
5444 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5445 } addrconf_sysctl __read_mostly = {
5446 .sysctl_header = NULL,
5447 .addrconf_vars = {
5448 {
5449 .procname = "forwarding",
5450 .data = &ipv6_devconf.forwarding,
5451 .maxlen = sizeof(int),
5452 .mode = 0644,
5453 .proc_handler = addrconf_sysctl_forward,
5454 },
5455 {
5456 .procname = "hop_limit",
5457 .data = &ipv6_devconf.hop_limit,
5458 .maxlen = sizeof(int),
5459 .mode = 0644,
5460 .proc_handler = proc_dointvec,
5461 },
5462 {
5463 .procname = "mtu",
5464 .data = &ipv6_devconf.mtu6,
5465 .maxlen = sizeof(int),
5466 .mode = 0644,
5467 .proc_handler = addrconf_sysctl_mtu,
5468 },
5469 {
5470 .procname = "accept_ra",
5471 .data = &ipv6_devconf.accept_ra,
5472 .maxlen = sizeof(int),
5473 .mode = 0644,
5474 .proc_handler = proc_dointvec,
5475 },
5476 {
5477 .procname = "accept_redirects",
5478 .data = &ipv6_devconf.accept_redirects,
5479 .maxlen = sizeof(int),
5480 .mode = 0644,
5481 .proc_handler = proc_dointvec,
5482 },
5483 {
5484 .procname = "autoconf",
5485 .data = &ipv6_devconf.autoconf,
5486 .maxlen = sizeof(int),
5487 .mode = 0644,
5488 .proc_handler = proc_dointvec,
5489 },
5490 {
5491 .procname = "dad_transmits",
5492 .data = &ipv6_devconf.dad_transmits,
5493 .maxlen = sizeof(int),
5494 .mode = 0644,
5495 .proc_handler = proc_dointvec,
5496 },
5497 {
5498 .procname = "router_solicitations",
5499 .data = &ipv6_devconf.rtr_solicits,
5500 .maxlen = sizeof(int),
5501 .mode = 0644,
5502 .proc_handler = proc_dointvec,
5503 },
5504 {
5505 .procname = "router_solicitation_interval",
5506 .data = &ipv6_devconf.rtr_solicit_interval,
5507 .maxlen = sizeof(int),
5508 .mode = 0644,
5509 .proc_handler = proc_dointvec_jiffies,
5510 },
5511 {
5512 .procname = "router_solicitation_delay",
5513 .data = &ipv6_devconf.rtr_solicit_delay,
5514 .maxlen = sizeof(int),
5515 .mode = 0644,
5516 .proc_handler = proc_dointvec_jiffies,
5517 },
5518 {
5519 .procname = "force_mld_version",
5520 .data = &ipv6_devconf.force_mld_version,
5521 .maxlen = sizeof(int),
5522 .mode = 0644,
5523 .proc_handler = proc_dointvec,
5524 },
5525 {
5526 .procname = "mldv1_unsolicited_report_interval",
5527 .data =
5528 &ipv6_devconf.mldv1_unsolicited_report_interval,
5529 .maxlen = sizeof(int),
5530 .mode = 0644,
5531 .proc_handler = proc_dointvec_ms_jiffies,
5532 },
5533 {
5534 .procname = "mldv2_unsolicited_report_interval",
5535 .data =
5536 &ipv6_devconf.mldv2_unsolicited_report_interval,
5537 .maxlen = sizeof(int),
5538 .mode = 0644,
5539 .proc_handler = proc_dointvec_ms_jiffies,
5540 },
5541 {
5542 .procname = "use_tempaddr",
5543 .data = &ipv6_devconf.use_tempaddr,
5544 .maxlen = sizeof(int),
5545 .mode = 0644,
5546 .proc_handler = proc_dointvec,
5547 },
5548 {
5549 .procname = "temp_valid_lft",
5550 .data = &ipv6_devconf.temp_valid_lft,
5551 .maxlen = sizeof(int),
5552 .mode = 0644,
5553 .proc_handler = proc_dointvec,
5554 },
5555 {
5556 .procname = "temp_prefered_lft",
5557 .data = &ipv6_devconf.temp_prefered_lft,
5558 .maxlen = sizeof(int),
5559 .mode = 0644,
5560 .proc_handler = proc_dointvec,
5561 },
5562 {
5563 .procname = "regen_max_retry",
5564 .data = &ipv6_devconf.regen_max_retry,
5565 .maxlen = sizeof(int),
5566 .mode = 0644,
5567 .proc_handler = proc_dointvec,
5568 },
5569 {
5570 .procname = "max_desync_factor",
5571 .data = &ipv6_devconf.max_desync_factor,
5572 .maxlen = sizeof(int),
5573 .mode = 0644,
5574 .proc_handler = proc_dointvec,
5575 },
5576 {
5577 .procname = "max_addresses",
5578 .data = &ipv6_devconf.max_addresses,
5579 .maxlen = sizeof(int),
5580 .mode = 0644,
5581 .proc_handler = proc_dointvec,
5582 },
5583 {
5584 .procname = "accept_ra_defrtr",
5585 .data = &ipv6_devconf.accept_ra_defrtr,
5586 .maxlen = sizeof(int),
5587 .mode = 0644,
5588 .proc_handler = proc_dointvec,
5589 },
5590 {
5591 .procname = "accept_ra_min_hop_limit",
5592 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5593 .maxlen = sizeof(int),
5594 .mode = 0644,
5595 .proc_handler = proc_dointvec,
5596 },
5597 {
5598 .procname = "accept_ra_pinfo",
5599 .data = &ipv6_devconf.accept_ra_pinfo,
5600 .maxlen = sizeof(int),
5601 .mode = 0644,
5602 .proc_handler = proc_dointvec,
5603 },
5604 #ifdef CONFIG_IPV6_ROUTER_PREF
5605 {
5606 .procname = "accept_ra_rtr_pref",
5607 .data = &ipv6_devconf.accept_ra_rtr_pref,
5608 .maxlen = sizeof(int),
5609 .mode = 0644,
5610 .proc_handler = proc_dointvec,
5611 },
5612 {
5613 .procname = "router_probe_interval",
5614 .data = &ipv6_devconf.rtr_probe_interval,
5615 .maxlen = sizeof(int),
5616 .mode = 0644,
5617 .proc_handler = proc_dointvec_jiffies,
5618 },
5619 #ifdef CONFIG_IPV6_ROUTE_INFO
5620 {
5621 .procname = "accept_ra_rt_info_max_plen",
5622 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5623 .maxlen = sizeof(int),
5624 .mode = 0644,
5625 .proc_handler = proc_dointvec,
5626 },
5627 #endif
5628 #endif
5629 {
5630 .procname = "proxy_ndp",
5631 .data = &ipv6_devconf.proxy_ndp,
5632 .maxlen = sizeof(int),
5633 .mode = 0644,
5634 .proc_handler = addrconf_sysctl_proxy_ndp,
5635 },
5636 {
5637 .procname = "accept_source_route",
5638 .data = &ipv6_devconf.accept_source_route,
5639 .maxlen = sizeof(int),
5640 .mode = 0644,
5641 .proc_handler = proc_dointvec,
5642 },
5643 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5644 {
5645 .procname = "optimistic_dad",
5646 .data = &ipv6_devconf.optimistic_dad,
5647 .maxlen = sizeof(int),
5648 .mode = 0644,
5649 .proc_handler = proc_dointvec,
5650
5651 },
5652 {
5653 .procname = "use_optimistic",
5654 .data = &ipv6_devconf.use_optimistic,
5655 .maxlen = sizeof(int),
5656 .mode = 0644,
5657 .proc_handler = proc_dointvec,
5658
5659 },
5660 #endif
5661 #ifdef CONFIG_IPV6_MROUTE
5662 {
5663 .procname = "mc_forwarding",
5664 .data = &ipv6_devconf.mc_forwarding,
5665 .maxlen = sizeof(int),
5666 .mode = 0444,
5667 .proc_handler = proc_dointvec,
5668 },
5669 #endif
5670 {
5671 .procname = "disable_ipv6",
5672 .data = &ipv6_devconf.disable_ipv6,
5673 .maxlen = sizeof(int),
5674 .mode = 0644,
5675 .proc_handler = addrconf_sysctl_disable,
5676 },
5677 {
5678 .procname = "accept_dad",
5679 .data = &ipv6_devconf.accept_dad,
5680 .maxlen = sizeof(int),
5681 .mode = 0644,
5682 .proc_handler = proc_dointvec,
5683 },
5684 {
5685 .procname = "force_tllao",
5686 .data = &ipv6_devconf.force_tllao,
5687 .maxlen = sizeof(int),
5688 .mode = 0644,
5689 .proc_handler = proc_dointvec
5690 },
5691 {
5692 .procname = "ndisc_notify",
5693 .data = &ipv6_devconf.ndisc_notify,
5694 .maxlen = sizeof(int),
5695 .mode = 0644,
5696 .proc_handler = proc_dointvec
5697 },
5698 {
5699 .procname = "suppress_frag_ndisc",
5700 .data = &ipv6_devconf.suppress_frag_ndisc,
5701 .maxlen = sizeof(int),
5702 .mode = 0644,
5703 .proc_handler = proc_dointvec
5704 },
5705 {
5706 .procname = "accept_ra_from_local",
5707 .data = &ipv6_devconf.accept_ra_from_local,
5708 .maxlen = sizeof(int),
5709 .mode = 0644,
5710 .proc_handler = proc_dointvec,
5711 },
5712 {
5713 .procname = "accept_ra_mtu",
5714 .data = &ipv6_devconf.accept_ra_mtu,
5715 .maxlen = sizeof(int),
5716 .mode = 0644,
5717 .proc_handler = proc_dointvec,
5718 },
5719 {
5720 .procname = "stable_secret",
5721 .data = &ipv6_devconf.stable_secret,
5722 .maxlen = IPV6_MAX_STRLEN,
5723 .mode = 0600,
5724 .proc_handler = addrconf_sysctl_stable_secret,
5725 },
5726 {
5727 .procname = "use_oif_addrs_only",
5728 .data = &ipv6_devconf.use_oif_addrs_only,
5729 .maxlen = sizeof(int),
5730 .mode = 0644,
5731 .proc_handler = proc_dointvec,
5732 },
5733 {
5734 .procname = "ignore_routes_with_linkdown",
5735 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5736 .maxlen = sizeof(int),
5737 .mode = 0644,
5738 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5739 },
5740 {
5741 /* sentinel */
5742 }
5743 },
5744 };
5745
5746 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5747 struct inet6_dev *idev, struct ipv6_devconf *p)
5748 {
5749 int i;
5750 struct addrconf_sysctl_table *t;
5751 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5752
5753 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5754 if (!t)
5755 goto out;
5756
5757 for (i = 0; t->addrconf_vars[i].data; i++) {
5758 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5759 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5760 t->addrconf_vars[i].extra2 = net;
5761 }
5762
5763 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5764
5765 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5766 if (!t->sysctl_header)
5767 goto free;
5768
5769 p->sysctl = t;
5770 return 0;
5771
5772 free:
5773 kfree(t);
5774 out:
5775 return -ENOBUFS;
5776 }
5777
5778 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5779 {
5780 struct addrconf_sysctl_table *t;
5781
5782 if (!p->sysctl)
5783 return;
5784
5785 t = p->sysctl;
5786 p->sysctl = NULL;
5787 unregister_net_sysctl_table(t->sysctl_header);
5788 kfree(t);
5789 }
5790
5791 static int addrconf_sysctl_register(struct inet6_dev *idev)
5792 {
5793 int err;
5794
5795 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5796 return -EINVAL;
5797
5798 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5799 &ndisc_ifinfo_sysctl_change);
5800 if (err)
5801 return err;
5802 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5803 idev, &idev->cnf);
5804 if (err)
5805 neigh_sysctl_unregister(idev->nd_parms);
5806
5807 return err;
5808 }
5809
5810 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5811 {
5812 __addrconf_sysctl_unregister(&idev->cnf);
5813 neigh_sysctl_unregister(idev->nd_parms);
5814 }
5815
5816
5817 #endif
5818
5819 static int __net_init addrconf_init_net(struct net *net)
5820 {
5821 int err = -ENOMEM;
5822 struct ipv6_devconf *all, *dflt;
5823
5824 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5825 if (!all)
5826 goto err_alloc_all;
5827
5828 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5829 if (!dflt)
5830 goto err_alloc_dflt;
5831
5832 /* these will be inherited by all namespaces */
5833 dflt->autoconf = ipv6_defaults.autoconf;
5834 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5835
5836 dflt->stable_secret.initialized = false;
5837 all->stable_secret.initialized = false;
5838
5839 net->ipv6.devconf_all = all;
5840 net->ipv6.devconf_dflt = dflt;
5841
5842 #ifdef CONFIG_SYSCTL
5843 err = __addrconf_sysctl_register(net, "all", NULL, all);
5844 if (err < 0)
5845 goto err_reg_all;
5846
5847 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5848 if (err < 0)
5849 goto err_reg_dflt;
5850 #endif
5851 return 0;
5852
5853 #ifdef CONFIG_SYSCTL
5854 err_reg_dflt:
5855 __addrconf_sysctl_unregister(all);
5856 err_reg_all:
5857 kfree(dflt);
5858 #endif
5859 err_alloc_dflt:
5860 kfree(all);
5861 err_alloc_all:
5862 return err;
5863 }
5864
5865 static void __net_exit addrconf_exit_net(struct net *net)
5866 {
5867 #ifdef CONFIG_SYSCTL
5868 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5869 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5870 #endif
5871 kfree(net->ipv6.devconf_dflt);
5872 kfree(net->ipv6.devconf_all);
5873 }
5874
5875 static struct pernet_operations addrconf_ops = {
5876 .init = addrconf_init_net,
5877 .exit = addrconf_exit_net,
5878 };
5879
5880 static struct rtnl_af_ops inet6_ops __read_mostly = {
5881 .family = AF_INET6,
5882 .fill_link_af = inet6_fill_link_af,
5883 .get_link_af_size = inet6_get_link_af_size,
5884 .validate_link_af = inet6_validate_link_af,
5885 .set_link_af = inet6_set_link_af,
5886 };
5887
5888 /*
5889 * Init / cleanup code
5890 */
5891
5892 int __init addrconf_init(void)
5893 {
5894 struct inet6_dev *idev;
5895 int i, err;
5896
5897 err = ipv6_addr_label_init();
5898 if (err < 0) {
5899 pr_crit("%s: cannot initialize default policy table: %d\n",
5900 __func__, err);
5901 goto out;
5902 }
5903
5904 err = register_pernet_subsys(&addrconf_ops);
5905 if (err < 0)
5906 goto out_addrlabel;
5907
5908 addrconf_wq = create_workqueue("ipv6_addrconf");
5909 if (!addrconf_wq) {
5910 err = -ENOMEM;
5911 goto out_nowq;
5912 }
5913
5914 /* The addrconf netdev notifier requires that loopback_dev
5915 * has it's ipv6 private information allocated and setup
5916 * before it can bring up and give link-local addresses
5917 * to other devices which are up.
5918 *
5919 * Unfortunately, loopback_dev is not necessarily the first
5920 * entry in the global dev_base list of net devices. In fact,
5921 * it is likely to be the very last entry on that list.
5922 * So this causes the notifier registry below to try and
5923 * give link-local addresses to all devices besides loopback_dev
5924 * first, then loopback_dev, which cases all the non-loopback_dev
5925 * devices to fail to get a link-local address.
5926 *
5927 * So, as a temporary fix, allocate the ipv6 structure for
5928 * loopback_dev first by hand.
5929 * Longer term, all of the dependencies ipv6 has upon the loopback
5930 * device and it being up should be removed.
5931 */
5932 rtnl_lock();
5933 idev = ipv6_add_dev(init_net.loopback_dev);
5934 rtnl_unlock();
5935 if (IS_ERR(idev)) {
5936 err = PTR_ERR(idev);
5937 goto errlo;
5938 }
5939
5940 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5941 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5942
5943 register_netdevice_notifier(&ipv6_dev_notf);
5944
5945 addrconf_verify();
5946
5947 rtnl_af_register(&inet6_ops);
5948
5949 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5950 NULL);
5951 if (err < 0)
5952 goto errout;
5953
5954 /* Only the first call to __rtnl_register can fail */
5955 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5956 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5957 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5958 inet6_dump_ifaddr, NULL);
5959 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5960 inet6_dump_ifmcaddr, NULL);
5961 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5962 inet6_dump_ifacaddr, NULL);
5963 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5964 inet6_netconf_dump_devconf, NULL);
5965
5966 ipv6_addr_label_rtnl_register();
5967
5968 return 0;
5969 errout:
5970 rtnl_af_unregister(&inet6_ops);
5971 unregister_netdevice_notifier(&ipv6_dev_notf);
5972 errlo:
5973 destroy_workqueue(addrconf_wq);
5974 out_nowq:
5975 unregister_pernet_subsys(&addrconf_ops);
5976 out_addrlabel:
5977 ipv6_addr_label_cleanup();
5978 out:
5979 return err;
5980 }
5981
5982 void addrconf_cleanup(void)
5983 {
5984 struct net_device *dev;
5985 int i;
5986
5987 unregister_netdevice_notifier(&ipv6_dev_notf);
5988 unregister_pernet_subsys(&addrconf_ops);
5989 ipv6_addr_label_cleanup();
5990
5991 rtnl_lock();
5992
5993 __rtnl_af_unregister(&inet6_ops);
5994
5995 /* clean dev list */
5996 for_each_netdev(&init_net, dev) {
5997 if (__in6_dev_get(dev) == NULL)
5998 continue;
5999 addrconf_ifdown(dev, 1);
6000 }
6001 addrconf_ifdown(init_net.loopback_dev, 2);
6002
6003 /*
6004 * Check hash table.
6005 */
6006 spin_lock_bh(&addrconf_hash_lock);
6007 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6008 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6009 spin_unlock_bh(&addrconf_hash_lock);
6010 cancel_delayed_work(&addr_chk_work);
6011 rtnl_unlock();
6012
6013 destroy_workqueue(addrconf_wq);
6014 }
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