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