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fs: create and use seq_show_option for escaping
[linux/fpc-iii.git] / net / ipv6 / addrconf.c
blob21c2c818df3b8379226555268ef526c08553d00d
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
2125 noflags |= RTF_CACHE;
2126 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2127 if (rt->dst.dev->ifindex != dev->ifindex)
2128 continue;
2129 if ((rt->rt6i_flags & flags) != flags)
2130 continue;
2131 if ((rt->rt6i_flags & noflags) != 0)
2132 continue;
2133 dst_hold(&rt->dst);
2134 break;
2135 }
2136 out:
2137 read_unlock_bh(&table->tb6_lock);
2138 return rt;
2139 }
2140
2141
2142 /* Create "default" multicast route to the interface */
2143
2144 static void addrconf_add_mroute(struct net_device *dev)
2145 {
2146 struct fib6_config cfg = {
2147 .fc_table = RT6_TABLE_LOCAL,
2148 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2149 .fc_ifindex = dev->ifindex,
2150 .fc_dst_len = 8,
2151 .fc_flags = RTF_UP,
2152 .fc_nlinfo.nl_net = dev_net(dev),
2153 };
2154
2155 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2156
2157 ip6_route_add(&cfg);
2158 }
2159
2160 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2161 {
2162 struct inet6_dev *idev;
2163
2164 ASSERT_RTNL();
2165
2166 idev = ipv6_find_idev(dev);
2167 if (!idev)
2168 return ERR_PTR(-ENOBUFS);
2169
2170 if (idev->cnf.disable_ipv6)
2171 return ERR_PTR(-EACCES);
2172
2173 /* Add default multicast route */
2174 if (!(dev->flags & IFF_LOOPBACK))
2175 addrconf_add_mroute(dev);
2176
2177 return idev;
2178 }
2179
2180 static void manage_tempaddrs(struct inet6_dev *idev,
2181 struct inet6_ifaddr *ifp,
2182 __u32 valid_lft, __u32 prefered_lft,
2183 bool create, unsigned long now)
2184 {
2185 u32 flags;
2186 struct inet6_ifaddr *ift;
2187
2188 read_lock_bh(&idev->lock);
2189 /* update all temporary addresses in the list */
2190 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2191 int age, max_valid, max_prefered;
2192
2193 if (ifp != ift->ifpub)
2194 continue;
2195
2196 /* RFC 4941 section 3.3:
2197 * If a received option will extend the lifetime of a public
2198 * address, the lifetimes of temporary addresses should
2199 * be extended, subject to the overall constraint that no
2200 * temporary addresses should ever remain "valid" or "preferred"
2201 * for a time longer than (TEMP_VALID_LIFETIME) or
2202 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2203 */
2204 age = (now - ift->cstamp) / HZ;
2205 max_valid = idev->cnf.temp_valid_lft - age;
2206 if (max_valid < 0)
2207 max_valid = 0;
2208
2209 max_prefered = idev->cnf.temp_prefered_lft -
2210 idev->cnf.max_desync_factor - age;
2211 if (max_prefered < 0)
2212 max_prefered = 0;
2213
2214 if (valid_lft > max_valid)
2215 valid_lft = max_valid;
2216
2217 if (prefered_lft > max_prefered)
2218 prefered_lft = max_prefered;
2219
2220 spin_lock(&ift->lock);
2221 flags = ift->flags;
2222 ift->valid_lft = valid_lft;
2223 ift->prefered_lft = prefered_lft;
2224 ift->tstamp = now;
2225 if (prefered_lft > 0)
2226 ift->flags &= ~IFA_F_DEPRECATED;
2227
2228 spin_unlock(&ift->lock);
2229 if (!(flags&IFA_F_TENTATIVE))
2230 ipv6_ifa_notify(0, ift);
2231 }
2232
2233 if ((create || list_empty(&idev->tempaddr_list)) &&
2234 idev->cnf.use_tempaddr > 0) {
2235 /* When a new public address is created as described
2236 * in [ADDRCONF], also create a new temporary address.
2237 * Also create a temporary address if it's enabled but
2238 * no temporary address currently exists.
2239 */
2240 read_unlock_bh(&idev->lock);
2241 ipv6_create_tempaddr(ifp, NULL);
2242 } else {
2243 read_unlock_bh(&idev->lock);
2244 }
2245 }
2246
2247 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2248 {
2249 struct prefix_info *pinfo;
2250 __u32 valid_lft;
2251 __u32 prefered_lft;
2252 int addr_type;
2253 u32 addr_flags = 0;
2254 struct inet6_dev *in6_dev;
2255 struct net *net = dev_net(dev);
2256
2257 pinfo = (struct prefix_info *) opt;
2258
2259 if (len < sizeof(struct prefix_info)) {
2260 ADBG("addrconf: prefix option too short\n");
2261 return;
2262 }
2263
2264 /*
2265 * Validation checks ([ADDRCONF], page 19)
2266 */
2267
2268 addr_type = ipv6_addr_type(&pinfo->prefix);
2269
2270 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2271 return;
2272
2273 valid_lft = ntohl(pinfo->valid);
2274 prefered_lft = ntohl(pinfo->prefered);
2275
2276 if (prefered_lft > valid_lft) {
2277 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2278 return;
2279 }
2280
2281 in6_dev = in6_dev_get(dev);
2282
2283 if (!in6_dev) {
2284 net_dbg_ratelimited("addrconf: device %s not configured\n",
2285 dev->name);
2286 return;
2287 }
2288
2289 /*
2290 * Two things going on here:
2291 * 1) Add routes for on-link prefixes
2292 * 2) Configure prefixes with the auto flag set
2293 */
2294
2295 if (pinfo->onlink) {
2296 struct rt6_info *rt;
2297 unsigned long rt_expires;
2298
2299 /* Avoid arithmetic overflow. Really, we could
2300 * save rt_expires in seconds, likely valid_lft,
2301 * but it would require division in fib gc, that it
2302 * not good.
2303 */
2304 if (HZ > USER_HZ)
2305 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2306 else
2307 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2308
2309 if (addrconf_finite_timeout(rt_expires))
2310 rt_expires *= HZ;
2311
2312 rt = addrconf_get_prefix_route(&pinfo->prefix,
2313 pinfo->prefix_len,
2314 dev,
2315 RTF_ADDRCONF | RTF_PREFIX_RT,
2316 RTF_GATEWAY | RTF_DEFAULT);
2317
2318 if (rt) {
2319 /* Autoconf prefix route */
2320 if (valid_lft == 0) {
2321 ip6_del_rt(rt);
2322 rt = NULL;
2323 } else if (addrconf_finite_timeout(rt_expires)) {
2324 /* not infinity */
2325 rt6_set_expires(rt, jiffies + rt_expires);
2326 } else {
2327 rt6_clean_expires(rt);
2328 }
2329 } else if (valid_lft) {
2330 clock_t expires = 0;
2331 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2332 if (addrconf_finite_timeout(rt_expires)) {
2333 /* not infinity */
2334 flags |= RTF_EXPIRES;
2335 expires = jiffies_to_clock_t(rt_expires);
2336 }
2337 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2338 dev, expires, flags);
2339 }
2340 ip6_rt_put(rt);
2341 }
2342
2343 /* Try to figure out our local address for this prefix */
2344
2345 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2346 struct inet6_ifaddr *ifp;
2347 struct in6_addr addr;
2348 int create = 0, update_lft = 0;
2349 bool tokenized = false;
2350
2351 if (pinfo->prefix_len == 64) {
2352 memcpy(&addr, &pinfo->prefix, 8);
2353
2354 if (!ipv6_addr_any(&in6_dev->token)) {
2355 read_lock_bh(&in6_dev->lock);
2356 memcpy(addr.s6_addr + 8,
2357 in6_dev->token.s6_addr + 8, 8);
2358 read_unlock_bh(&in6_dev->lock);
2359 tokenized = true;
2360 } else if (in6_dev->addr_gen_mode ==
2361 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2362 !ipv6_generate_stable_address(&addr, 0,
2363 in6_dev)) {
2364 addr_flags |= IFA_F_STABLE_PRIVACY;
2365 goto ok;
2366 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2367 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2368 in6_dev_put(in6_dev);
2369 return;
2370 }
2371 goto ok;
2372 }
2373 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2374 pinfo->prefix_len);
2375 in6_dev_put(in6_dev);
2376 return;
2377
2378 ok:
2379
2380 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2381
2382 if (!ifp && valid_lft) {
2383 int max_addresses = in6_dev->cnf.max_addresses;
2384
2385 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2386 if (in6_dev->cnf.optimistic_dad &&
2387 !net->ipv6.devconf_all->forwarding && sllao)
2388 addr_flags = IFA_F_OPTIMISTIC;
2389 #endif
2390
2391 /* Do not allow to create too much of autoconfigured
2392 * addresses; this would be too easy way to crash kernel.
2393 */
2394 if (!max_addresses ||
2395 ipv6_count_addresses(in6_dev) < max_addresses)
2396 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2397 pinfo->prefix_len,
2398 addr_type&IPV6_ADDR_SCOPE_MASK,
2399 addr_flags, valid_lft,
2400 prefered_lft);
2401
2402 if (IS_ERR_OR_NULL(ifp)) {
2403 in6_dev_put(in6_dev);
2404 return;
2405 }
2406
2407 update_lft = 0;
2408 create = 1;
2409 spin_lock_bh(&ifp->lock);
2410 ifp->flags |= IFA_F_MANAGETEMPADDR;
2411 ifp->cstamp = jiffies;
2412 ifp->tokenized = tokenized;
2413 spin_unlock_bh(&ifp->lock);
2414 addrconf_dad_start(ifp);
2415 }
2416
2417 if (ifp) {
2418 u32 flags;
2419 unsigned long now;
2420 u32 stored_lft;
2421
2422 /* update lifetime (RFC2462 5.5.3 e) */
2423 spin_lock_bh(&ifp->lock);
2424 now = jiffies;
2425 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2426 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2427 else
2428 stored_lft = 0;
2429 if (!update_lft && !create && stored_lft) {
2430 const u32 minimum_lft = min_t(u32,
2431 stored_lft, MIN_VALID_LIFETIME);
2432 valid_lft = max(valid_lft, minimum_lft);
2433
2434 /* RFC4862 Section 5.5.3e:
2435 * "Note that the preferred lifetime of the
2436 * corresponding address is always reset to
2437 * the Preferred Lifetime in the received
2438 * Prefix Information option, regardless of
2439 * whether the valid lifetime is also reset or
2440 * ignored."
2441 *
2442 * So we should always update prefered_lft here.
2443 */
2444 update_lft = 1;
2445 }
2446
2447 if (update_lft) {
2448 ifp->valid_lft = valid_lft;
2449 ifp->prefered_lft = prefered_lft;
2450 ifp->tstamp = now;
2451 flags = ifp->flags;
2452 ifp->flags &= ~IFA_F_DEPRECATED;
2453 spin_unlock_bh(&ifp->lock);
2454
2455 if (!(flags&IFA_F_TENTATIVE))
2456 ipv6_ifa_notify(0, ifp);
2457 } else
2458 spin_unlock_bh(&ifp->lock);
2459
2460 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2461 create, now);
2462
2463 in6_ifa_put(ifp);
2464 addrconf_verify();
2465 }
2466 }
2467 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2468 in6_dev_put(in6_dev);
2469 }
2470
2471 /*
2472 * Set destination address.
2473 * Special case for SIT interfaces where we create a new "virtual"
2474 * device.
2475 */
2476 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2477 {
2478 struct in6_ifreq ireq;
2479 struct net_device *dev;
2480 int err = -EINVAL;
2481
2482 rtnl_lock();
2483
2484 err = -EFAULT;
2485 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2486 goto err_exit;
2487
2488 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2489
2490 err = -ENODEV;
2491 if (!dev)
2492 goto err_exit;
2493
2494 #if IS_ENABLED(CONFIG_IPV6_SIT)
2495 if (dev->type == ARPHRD_SIT) {
2496 const struct net_device_ops *ops = dev->netdev_ops;
2497 struct ifreq ifr;
2498 struct ip_tunnel_parm p;
2499
2500 err = -EADDRNOTAVAIL;
2501 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2502 goto err_exit;
2503
2504 memset(&p, 0, sizeof(p));
2505 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2506 p.iph.saddr = 0;
2507 p.iph.version = 4;
2508 p.iph.ihl = 5;
2509 p.iph.protocol = IPPROTO_IPV6;
2510 p.iph.ttl = 64;
2511 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2512
2513 if (ops->ndo_do_ioctl) {
2514 mm_segment_t oldfs = get_fs();
2515
2516 set_fs(KERNEL_DS);
2517 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2518 set_fs(oldfs);
2519 } else
2520 err = -EOPNOTSUPP;
2521
2522 if (err == 0) {
2523 err = -ENOBUFS;
2524 dev = __dev_get_by_name(net, p.name);
2525 if (!dev)
2526 goto err_exit;
2527 err = dev_open(dev);
2528 }
2529 }
2530 #endif
2531
2532 err_exit:
2533 rtnl_unlock();
2534 return err;
2535 }
2536
2537 static int ipv6_mc_config(struct sock *sk, bool join,
2538 const struct in6_addr *addr, int ifindex)
2539 {
2540 int ret;
2541
2542 ASSERT_RTNL();
2543
2544 lock_sock(sk);
2545 if (join)
2546 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2547 else
2548 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2549 release_sock(sk);
2550
2551 return ret;
2552 }
2553
2554 /*
2555 * Manual configuration of address on an interface
2556 */
2557 static int inet6_addr_add(struct net *net, int ifindex,
2558 const struct in6_addr *pfx,
2559 const struct in6_addr *peer_pfx,
2560 unsigned int plen, __u32 ifa_flags,
2561 __u32 prefered_lft, __u32 valid_lft)
2562 {
2563 struct inet6_ifaddr *ifp;
2564 struct inet6_dev *idev;
2565 struct net_device *dev;
2566 unsigned long timeout;
2567 clock_t expires;
2568 int scope;
2569 u32 flags;
2570
2571 ASSERT_RTNL();
2572
2573 if (plen > 128)
2574 return -EINVAL;
2575
2576 /* check the lifetime */
2577 if (!valid_lft || prefered_lft > valid_lft)
2578 return -EINVAL;
2579
2580 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2581 return -EINVAL;
2582
2583 dev = __dev_get_by_index(net, ifindex);
2584 if (!dev)
2585 return -ENODEV;
2586
2587 idev = addrconf_add_dev(dev);
2588 if (IS_ERR(idev))
2589 return PTR_ERR(idev);
2590
2591 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2592 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2593 true, pfx, ifindex);
2594
2595 if (ret < 0)
2596 return ret;
2597 }
2598
2599 scope = ipv6_addr_scope(pfx);
2600
2601 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2602 if (addrconf_finite_timeout(timeout)) {
2603 expires = jiffies_to_clock_t(timeout * HZ);
2604 valid_lft = timeout;
2605 flags = RTF_EXPIRES;
2606 } else {
2607 expires = 0;
2608 flags = 0;
2609 ifa_flags |= IFA_F_PERMANENT;
2610 }
2611
2612 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2613 if (addrconf_finite_timeout(timeout)) {
2614 if (timeout == 0)
2615 ifa_flags |= IFA_F_DEPRECATED;
2616 prefered_lft = timeout;
2617 }
2618
2619 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2620 valid_lft, prefered_lft);
2621
2622 if (!IS_ERR(ifp)) {
2623 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2624 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2625 expires, flags);
2626 }
2627
2628 /*
2629 * Note that section 3.1 of RFC 4429 indicates
2630 * that the Optimistic flag should not be set for
2631 * manually configured addresses
2632 */
2633 addrconf_dad_start(ifp);
2634 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2635 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2636 true, jiffies);
2637 in6_ifa_put(ifp);
2638 addrconf_verify_rtnl();
2639 return 0;
2640 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2641 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2642 false, pfx, ifindex);
2643 }
2644
2645 return PTR_ERR(ifp);
2646 }
2647
2648 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2649 const struct in6_addr *pfx, unsigned int plen)
2650 {
2651 struct inet6_ifaddr *ifp;
2652 struct inet6_dev *idev;
2653 struct net_device *dev;
2654
2655 if (plen > 128)
2656 return -EINVAL;
2657
2658 dev = __dev_get_by_index(net, ifindex);
2659 if (!dev)
2660 return -ENODEV;
2661
2662 idev = __in6_dev_get(dev);
2663 if (!idev)
2664 return -ENXIO;
2665
2666 read_lock_bh(&idev->lock);
2667 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2668 if (ifp->prefix_len == plen &&
2669 ipv6_addr_equal(pfx, &ifp->addr)) {
2670 in6_ifa_hold(ifp);
2671 read_unlock_bh(&idev->lock);
2672
2673 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2674 (ifa_flags & IFA_F_MANAGETEMPADDR))
2675 manage_tempaddrs(idev, ifp, 0, 0, false,
2676 jiffies);
2677 ipv6_del_addr(ifp);
2678 addrconf_verify_rtnl();
2679 if (ipv6_addr_is_multicast(pfx)) {
2680 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2681 false, pfx, dev->ifindex);
2682 }
2683 return 0;
2684 }
2685 }
2686 read_unlock_bh(&idev->lock);
2687 return -EADDRNOTAVAIL;
2688 }
2689
2690
2691 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2692 {
2693 struct in6_ifreq ireq;
2694 int err;
2695
2696 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2697 return -EPERM;
2698
2699 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2700 return -EFAULT;
2701
2702 rtnl_lock();
2703 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2704 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2705 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2706 rtnl_unlock();
2707 return err;
2708 }
2709
2710 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2711 {
2712 struct in6_ifreq ireq;
2713 int err;
2714
2715 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2716 return -EPERM;
2717
2718 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2719 return -EFAULT;
2720
2721 rtnl_lock();
2722 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2723 ireq.ifr6_prefixlen);
2724 rtnl_unlock();
2725 return err;
2726 }
2727
2728 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2729 int plen, int scope)
2730 {
2731 struct inet6_ifaddr *ifp;
2732
2733 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2734 scope, IFA_F_PERMANENT,
2735 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2736 if (!IS_ERR(ifp)) {
2737 spin_lock_bh(&ifp->lock);
2738 ifp->flags &= ~IFA_F_TENTATIVE;
2739 spin_unlock_bh(&ifp->lock);
2740 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2741 in6_ifa_put(ifp);
2742 }
2743 }
2744
2745 #if IS_ENABLED(CONFIG_IPV6_SIT)
2746 static void sit_add_v4_addrs(struct inet6_dev *idev)
2747 {
2748 struct in6_addr addr;
2749 struct net_device *dev;
2750 struct net *net = dev_net(idev->dev);
2751 int scope, plen;
2752 u32 pflags = 0;
2753
2754 ASSERT_RTNL();
2755
2756 memset(&addr, 0, sizeof(struct in6_addr));
2757 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2758
2759 if (idev->dev->flags&IFF_POINTOPOINT) {
2760 addr.s6_addr32[0] = htonl(0xfe800000);
2761 scope = IFA_LINK;
2762 plen = 64;
2763 } else {
2764 scope = IPV6_ADDR_COMPATv4;
2765 plen = 96;
2766 pflags |= RTF_NONEXTHOP;
2767 }
2768
2769 if (addr.s6_addr32[3]) {
2770 add_addr(idev, &addr, plen, scope);
2771 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2772 return;
2773 }
2774
2775 for_each_netdev(net, dev) {
2776 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2777 if (in_dev && (dev->flags & IFF_UP)) {
2778 struct in_ifaddr *ifa;
2779
2780 int flag = scope;
2781
2782 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2783
2784 addr.s6_addr32[3] = ifa->ifa_local;
2785
2786 if (ifa->ifa_scope == RT_SCOPE_LINK)
2787 continue;
2788 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2789 if (idev->dev->flags&IFF_POINTOPOINT)
2790 continue;
2791 flag |= IFA_HOST;
2792 }
2793
2794 add_addr(idev, &addr, plen, flag);
2795 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2796 pflags);
2797 }
2798 }
2799 }
2800 }
2801 #endif
2802
2803 static void init_loopback(struct net_device *dev)
2804 {
2805 struct inet6_dev *idev;
2806 struct net_device *sp_dev;
2807 struct inet6_ifaddr *sp_ifa;
2808 struct rt6_info *sp_rt;
2809
2810 /* ::1 */
2811
2812 ASSERT_RTNL();
2813
2814 idev = ipv6_find_idev(dev);
2815 if (!idev) {
2816 pr_debug("%s: add_dev failed\n", __func__);
2817 return;
2818 }
2819
2820 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2821
2822 /* Add routes to other interface's IPv6 addresses */
2823 for_each_netdev(dev_net(dev), sp_dev) {
2824 if (!strcmp(sp_dev->name, dev->name))
2825 continue;
2826
2827 idev = __in6_dev_get(sp_dev);
2828 if (!idev)
2829 continue;
2830
2831 read_lock_bh(&idev->lock);
2832 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2833
2834 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2835 continue;
2836
2837 if (sp_ifa->rt) {
2838 /* This dst has been added to garbage list when
2839 * lo device down, release this obsolete dst and
2840 * reallocate a new router for ifa.
2841 */
2842 if (sp_ifa->rt->dst.obsolete > 0) {
2843 ip6_rt_put(sp_ifa->rt);
2844 sp_ifa->rt = NULL;
2845 } else {
2846 continue;
2847 }
2848 }
2849
2850 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2851
2852 /* Failure cases are ignored */
2853 if (!IS_ERR(sp_rt)) {
2854 sp_ifa->rt = sp_rt;
2855 ip6_ins_rt(sp_rt);
2856 }
2857 }
2858 read_unlock_bh(&idev->lock);
2859 }
2860 }
2861
2862 static void addrconf_add_linklocal(struct inet6_dev *idev,
2863 const struct in6_addr *addr, u32 flags)
2864 {
2865 struct inet6_ifaddr *ifp;
2866 u32 addr_flags = flags | IFA_F_PERMANENT;
2867
2868 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2869 if (idev->cnf.optimistic_dad &&
2870 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2871 addr_flags |= IFA_F_OPTIMISTIC;
2872 #endif
2873
2874 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2875 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2876 if (!IS_ERR(ifp)) {
2877 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2878 addrconf_dad_start(ifp);
2879 in6_ifa_put(ifp);
2880 }
2881 }
2882
2883 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2884 {
2885 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2886 return true;
2887
2888 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2889 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2890 return true;
2891
2892 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2893 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2894 return true;
2895
2896 return false;
2897 }
2898
2899 static int ipv6_generate_stable_address(struct in6_addr *address,
2900 u8 dad_count,
2901 const struct inet6_dev *idev)
2902 {
2903 static DEFINE_SPINLOCK(lock);
2904 static __u32 digest[SHA_DIGEST_WORDS];
2905 static __u32 workspace[SHA_WORKSPACE_WORDS];
2906
2907 static union {
2908 char __data[SHA_MESSAGE_BYTES];
2909 struct {
2910 struct in6_addr secret;
2911 __be32 prefix[2];
2912 unsigned char hwaddr[MAX_ADDR_LEN];
2913 u8 dad_count;
2914 } __packed;
2915 } data;
2916
2917 struct in6_addr secret;
2918 struct in6_addr temp;
2919 struct net *net = dev_net(idev->dev);
2920
2921 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2922
2923 if (idev->cnf.stable_secret.initialized)
2924 secret = idev->cnf.stable_secret.secret;
2925 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2926 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2927 else
2928 return -1;
2929
2930 retry:
2931 spin_lock_bh(&lock);
2932
2933 sha_init(digest);
2934 memset(&data, 0, sizeof(data));
2935 memset(workspace, 0, sizeof(workspace));
2936 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
2937 data.prefix[0] = address->s6_addr32[0];
2938 data.prefix[1] = address->s6_addr32[1];
2939 data.secret = secret;
2940 data.dad_count = dad_count;
2941
2942 sha_transform(digest, data.__data, workspace);
2943
2944 temp = *address;
2945 temp.s6_addr32[2] = (__force __be32)digest[0];
2946 temp.s6_addr32[3] = (__force __be32)digest[1];
2947
2948 spin_unlock_bh(&lock);
2949
2950 if (ipv6_reserved_interfaceid(temp)) {
2951 dad_count++;
2952 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
2953 return -1;
2954 goto retry;
2955 }
2956
2957 *address = temp;
2958 return 0;
2959 }
2960
2961 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2962 {
2963 struct in6_addr addr;
2964
2965 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2966
2967 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
2968 if (!ipv6_generate_stable_address(&addr, 0, idev))
2969 addrconf_add_linklocal(idev, &addr,
2970 IFA_F_STABLE_PRIVACY);
2971 else if (prefix_route)
2972 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2973 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
2974 /* addrconf_add_linklocal also adds a prefix_route and we
2975 * only need to care about prefix routes if ipv6_generate_eui64
2976 * couldn't generate one.
2977 */
2978 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
2979 addrconf_add_linklocal(idev, &addr, 0);
2980 else if (prefix_route)
2981 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2982 }
2983 }
2984
2985 static void addrconf_dev_config(struct net_device *dev)
2986 {
2987 struct inet6_dev *idev;
2988
2989 ASSERT_RTNL();
2990
2991 if ((dev->type != ARPHRD_ETHER) &&
2992 (dev->type != ARPHRD_FDDI) &&
2993 (dev->type != ARPHRD_ARCNET) &&
2994 (dev->type != ARPHRD_INFINIBAND) &&
2995 (dev->type != ARPHRD_IEEE802154) &&
2996 (dev->type != ARPHRD_IEEE1394) &&
2997 (dev->type != ARPHRD_TUNNEL6) &&
2998 (dev->type != ARPHRD_6LOWPAN)) {
2999 /* Alas, we support only Ethernet autoconfiguration. */
3000 return;
3001 }
3002
3003 idev = addrconf_add_dev(dev);
3004 if (IS_ERR(idev))
3005 return;
3006
3007 addrconf_addr_gen(idev, false);
3008 }
3009
3010 #if IS_ENABLED(CONFIG_IPV6_SIT)
3011 static void addrconf_sit_config(struct net_device *dev)
3012 {
3013 struct inet6_dev *idev;
3014
3015 ASSERT_RTNL();
3016
3017 /*
3018 * Configure the tunnel with one of our IPv4
3019 * addresses... we should configure all of
3020 * our v4 addrs in the tunnel
3021 */
3022
3023 idev = ipv6_find_idev(dev);
3024 if (!idev) {
3025 pr_debug("%s: add_dev failed\n", __func__);
3026 return;
3027 }
3028
3029 if (dev->priv_flags & IFF_ISATAP) {
3030 addrconf_addr_gen(idev, false);
3031 return;
3032 }
3033
3034 sit_add_v4_addrs(idev);
3035
3036 if (dev->flags&IFF_POINTOPOINT)
3037 addrconf_add_mroute(dev);
3038 }
3039 #endif
3040
3041 #if IS_ENABLED(CONFIG_NET_IPGRE)
3042 static void addrconf_gre_config(struct net_device *dev)
3043 {
3044 struct inet6_dev *idev;
3045
3046 ASSERT_RTNL();
3047
3048 idev = ipv6_find_idev(dev);
3049 if (!idev) {
3050 pr_debug("%s: add_dev failed\n", __func__);
3051 return;
3052 }
3053
3054 addrconf_addr_gen(idev, true);
3055 }
3056 #endif
3057
3058 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3059 void *ptr)
3060 {
3061 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3062 struct inet6_dev *idev = __in6_dev_get(dev);
3063 int run_pending = 0;
3064 int err;
3065
3066 switch (event) {
3067 case NETDEV_REGISTER:
3068 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3069 idev = ipv6_add_dev(dev);
3070 if (IS_ERR(idev))
3071 return notifier_from_errno(PTR_ERR(idev));
3072 }
3073 break;
3074
3075 case NETDEV_UP:
3076 case NETDEV_CHANGE:
3077 if (dev->flags & IFF_SLAVE)
3078 break;
3079
3080 if (idev && idev->cnf.disable_ipv6)
3081 break;
3082
3083 if (event == NETDEV_UP) {
3084 if (!addrconf_qdisc_ok(dev)) {
3085 /* device is not ready yet. */
3086 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3087 dev->name);
3088 break;
3089 }
3090
3091 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3092 idev = ipv6_add_dev(dev);
3093
3094 if (!IS_ERR_OR_NULL(idev)) {
3095 idev->if_flags |= IF_READY;
3096 run_pending = 1;
3097 }
3098 } else {
3099 if (!addrconf_qdisc_ok(dev)) {
3100 /* device is still not ready. */
3101 break;
3102 }
3103
3104 if (idev) {
3105 if (idev->if_flags & IF_READY)
3106 /* device is already configured. */
3107 break;
3108 idev->if_flags |= IF_READY;
3109 }
3110
3111 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3112 dev->name);
3113
3114 run_pending = 1;
3115 }
3116
3117 switch (dev->type) {
3118 #if IS_ENABLED(CONFIG_IPV6_SIT)
3119 case ARPHRD_SIT:
3120 addrconf_sit_config(dev);
3121 break;
3122 #endif
3123 #if IS_ENABLED(CONFIG_NET_IPGRE)
3124 case ARPHRD_IPGRE:
3125 addrconf_gre_config(dev);
3126 break;
3127 #endif
3128 case ARPHRD_LOOPBACK:
3129 init_loopback(dev);
3130 break;
3131
3132 default:
3133 addrconf_dev_config(dev);
3134 break;
3135 }
3136
3137 if (!IS_ERR_OR_NULL(idev)) {
3138 if (run_pending)
3139 addrconf_dad_run(idev);
3140
3141 /*
3142 * If the MTU changed during the interface down,
3143 * when the interface up, the changed MTU must be
3144 * reflected in the idev as well as routers.
3145 */
3146 if (idev->cnf.mtu6 != dev->mtu &&
3147 dev->mtu >= IPV6_MIN_MTU) {
3148 rt6_mtu_change(dev, dev->mtu);
3149 idev->cnf.mtu6 = dev->mtu;
3150 }
3151 idev->tstamp = jiffies;
3152 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3153
3154 /*
3155 * If the changed mtu during down is lower than
3156 * IPV6_MIN_MTU stop IPv6 on this interface.
3157 */
3158 if (dev->mtu < IPV6_MIN_MTU)
3159 addrconf_ifdown(dev, 1);
3160 }
3161 break;
3162
3163 case NETDEV_CHANGEMTU:
3164 if (idev && dev->mtu >= IPV6_MIN_MTU) {
3165 rt6_mtu_change(dev, dev->mtu);
3166 idev->cnf.mtu6 = dev->mtu;
3167 break;
3168 }
3169
3170 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3171 idev = ipv6_add_dev(dev);
3172 if (!IS_ERR(idev))
3173 break;
3174 }
3175
3176 /*
3177 * if MTU under IPV6_MIN_MTU.
3178 * Stop IPv6 on this interface.
3179 */
3180
3181 case NETDEV_DOWN:
3182 case NETDEV_UNREGISTER:
3183 /*
3184 * Remove all addresses from this interface.
3185 */
3186 addrconf_ifdown(dev, event != NETDEV_DOWN);
3187 break;
3188
3189 case NETDEV_CHANGENAME:
3190 if (idev) {
3191 snmp6_unregister_dev(idev);
3192 addrconf_sysctl_unregister(idev);
3193 err = addrconf_sysctl_register(idev);
3194 if (err)
3195 return notifier_from_errno(err);
3196 err = snmp6_register_dev(idev);
3197 if (err) {
3198 addrconf_sysctl_unregister(idev);
3199 return notifier_from_errno(err);
3200 }
3201 }
3202 break;
3203
3204 case NETDEV_PRE_TYPE_CHANGE:
3205 case NETDEV_POST_TYPE_CHANGE:
3206 addrconf_type_change(dev, event);
3207 break;
3208 }
3209
3210 return NOTIFY_OK;
3211 }
3212
3213 /*
3214 * addrconf module should be notified of a device going up
3215 */
3216 static struct notifier_block ipv6_dev_notf = {
3217 .notifier_call = addrconf_notify,
3218 };
3219
3220 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3221 {
3222 struct inet6_dev *idev;
3223 ASSERT_RTNL();
3224
3225 idev = __in6_dev_get(dev);
3226
3227 if (event == NETDEV_POST_TYPE_CHANGE)
3228 ipv6_mc_remap(idev);
3229 else if (event == NETDEV_PRE_TYPE_CHANGE)
3230 ipv6_mc_unmap(idev);
3231 }
3232
3233 static int addrconf_ifdown(struct net_device *dev, int how)
3234 {
3235 struct net *net = dev_net(dev);
3236 struct inet6_dev *idev;
3237 struct inet6_ifaddr *ifa;
3238 int state, i;
3239
3240 ASSERT_RTNL();
3241
3242 rt6_ifdown(net, dev);
3243 neigh_ifdown(&nd_tbl, dev);
3244
3245 idev = __in6_dev_get(dev);
3246 if (!idev)
3247 return -ENODEV;
3248
3249 /*
3250 * Step 1: remove reference to ipv6 device from parent device.
3251 * Do not dev_put!
3252 */
3253 if (how) {
3254 idev->dead = 1;
3255
3256 /* protected by rtnl_lock */
3257 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3258
3259 /* Step 1.5: remove snmp6 entry */
3260 snmp6_unregister_dev(idev);
3261
3262 }
3263
3264 /* Step 2: clear hash table */
3265 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3266 struct hlist_head *h = &inet6_addr_lst[i];
3267
3268 spin_lock_bh(&addrconf_hash_lock);
3269 restart:
3270 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3271 if (ifa->idev == idev) {
3272 hlist_del_init_rcu(&ifa->addr_lst);
3273 addrconf_del_dad_work(ifa);
3274 goto restart;
3275 }
3276 }
3277 spin_unlock_bh(&addrconf_hash_lock);
3278 }
3279
3280 write_lock_bh(&idev->lock);
3281
3282 addrconf_del_rs_timer(idev);
3283
3284 /* Step 2: clear flags for stateless addrconf */
3285 if (!how)
3286 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3287
3288 if (how && del_timer(&idev->regen_timer))
3289 in6_dev_put(idev);
3290
3291 /* Step 3: clear tempaddr list */
3292 while (!list_empty(&idev->tempaddr_list)) {
3293 ifa = list_first_entry(&idev->tempaddr_list,
3294 struct inet6_ifaddr, tmp_list);
3295 list_del(&ifa->tmp_list);
3296 write_unlock_bh(&idev->lock);
3297 spin_lock_bh(&ifa->lock);
3298
3299 if (ifa->ifpub) {
3300 in6_ifa_put(ifa->ifpub);
3301 ifa->ifpub = NULL;
3302 }
3303 spin_unlock_bh(&ifa->lock);
3304 in6_ifa_put(ifa);
3305 write_lock_bh(&idev->lock);
3306 }
3307
3308 while (!list_empty(&idev->addr_list)) {
3309 ifa = list_first_entry(&idev->addr_list,
3310 struct inet6_ifaddr, if_list);
3311 addrconf_del_dad_work(ifa);
3312
3313 list_del(&ifa->if_list);
3314
3315 write_unlock_bh(&idev->lock);
3316
3317 spin_lock_bh(&ifa->lock);
3318 state = ifa->state;
3319 ifa->state = INET6_IFADDR_STATE_DEAD;
3320 spin_unlock_bh(&ifa->lock);
3321
3322 if (state != INET6_IFADDR_STATE_DEAD) {
3323 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3324 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3325 }
3326 in6_ifa_put(ifa);
3327
3328 write_lock_bh(&idev->lock);
3329 }
3330
3331 write_unlock_bh(&idev->lock);
3332
3333 /* Step 5: Discard anycast and multicast list */
3334 if (how) {
3335 ipv6_ac_destroy_dev(idev);
3336 ipv6_mc_destroy_dev(idev);
3337 } else {
3338 ipv6_mc_down(idev);
3339 }
3340
3341 idev->tstamp = jiffies;
3342
3343 /* Last: Shot the device (if unregistered) */
3344 if (how) {
3345 addrconf_sysctl_unregister(idev);
3346 neigh_parms_release(&nd_tbl, idev->nd_parms);
3347 neigh_ifdown(&nd_tbl, dev);
3348 in6_dev_put(idev);
3349 }
3350 return 0;
3351 }
3352
3353 static void addrconf_rs_timer(unsigned long data)
3354 {
3355 struct inet6_dev *idev = (struct inet6_dev *)data;
3356 struct net_device *dev = idev->dev;
3357 struct in6_addr lladdr;
3358
3359 write_lock(&idev->lock);
3360 if (idev->dead || !(idev->if_flags & IF_READY))
3361 goto out;
3362
3363 if (!ipv6_accept_ra(idev))
3364 goto out;
3365
3366 /* Announcement received after solicitation was sent */
3367 if (idev->if_flags & IF_RA_RCVD)
3368 goto out;
3369
3370 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3371 write_unlock(&idev->lock);
3372 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3373 ndisc_send_rs(dev, &lladdr,
3374 &in6addr_linklocal_allrouters);
3375 else
3376 goto put;
3377
3378 write_lock(&idev->lock);
3379 /* The wait after the last probe can be shorter */
3380 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3381 idev->cnf.rtr_solicits) ?
3382 idev->cnf.rtr_solicit_delay :
3383 idev->cnf.rtr_solicit_interval);
3384 } else {
3385 /*
3386 * Note: we do not support deprecated "all on-link"
3387 * assumption any longer.
3388 */
3389 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3390 }
3391
3392 out:
3393 write_unlock(&idev->lock);
3394 put:
3395 in6_dev_put(idev);
3396 }
3397
3398 /*
3399 * Duplicate Address Detection
3400 */
3401 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3402 {
3403 unsigned long rand_num;
3404 struct inet6_dev *idev = ifp->idev;
3405
3406 if (ifp->flags & IFA_F_OPTIMISTIC)
3407 rand_num = 0;
3408 else
3409 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3410
3411 ifp->dad_probes = idev->cnf.dad_transmits;
3412 addrconf_mod_dad_work(ifp, rand_num);
3413 }
3414
3415 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3416 {
3417 struct inet6_dev *idev = ifp->idev;
3418 struct net_device *dev = idev->dev;
3419
3420 addrconf_join_solict(dev, &ifp->addr);
3421
3422 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3423
3424 read_lock_bh(&idev->lock);
3425 spin_lock(&ifp->lock);
3426 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3427 goto out;
3428
3429 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3430 idev->cnf.accept_dad < 1 ||
3431 !(ifp->flags&IFA_F_TENTATIVE) ||
3432 ifp->flags & IFA_F_NODAD) {
3433 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3434 spin_unlock(&ifp->lock);
3435 read_unlock_bh(&idev->lock);
3436
3437 addrconf_dad_completed(ifp);
3438 return;
3439 }
3440
3441 if (!(idev->if_flags & IF_READY)) {
3442 spin_unlock(&ifp->lock);
3443 read_unlock_bh(&idev->lock);
3444 /*
3445 * If the device is not ready:
3446 * - keep it tentative if it is a permanent address.
3447 * - otherwise, kill it.
3448 */
3449 in6_ifa_hold(ifp);
3450 addrconf_dad_stop(ifp, 0);
3451 return;
3452 }
3453
3454 /*
3455 * Optimistic nodes can start receiving
3456 * Frames right away
3457 */
3458 if (ifp->flags & IFA_F_OPTIMISTIC) {
3459 ip6_ins_rt(ifp->rt);
3460 if (ipv6_use_optimistic_addr(idev)) {
3461 /* Because optimistic nodes can use this address,
3462 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3463 */
3464 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3465 }
3466 }
3467
3468 addrconf_dad_kick(ifp);
3469 out:
3470 spin_unlock(&ifp->lock);
3471 read_unlock_bh(&idev->lock);
3472 }
3473
3474 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3475 {
3476 bool begin_dad = false;
3477
3478 spin_lock_bh(&ifp->lock);
3479 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3480 ifp->state = INET6_IFADDR_STATE_PREDAD;
3481 begin_dad = true;
3482 }
3483 spin_unlock_bh(&ifp->lock);
3484
3485 if (begin_dad)
3486 addrconf_mod_dad_work(ifp, 0);
3487 }
3488
3489 static void addrconf_dad_work(struct work_struct *w)
3490 {
3491 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3492 struct inet6_ifaddr,
3493 dad_work);
3494 struct inet6_dev *idev = ifp->idev;
3495 struct in6_addr mcaddr;
3496
3497 enum {
3498 DAD_PROCESS,
3499 DAD_BEGIN,
3500 DAD_ABORT,
3501 } action = DAD_PROCESS;
3502
3503 rtnl_lock();
3504
3505 spin_lock_bh(&ifp->lock);
3506 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3507 action = DAD_BEGIN;
3508 ifp->state = INET6_IFADDR_STATE_DAD;
3509 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3510 action = DAD_ABORT;
3511 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3512 }
3513 spin_unlock_bh(&ifp->lock);
3514
3515 if (action == DAD_BEGIN) {
3516 addrconf_dad_begin(ifp);
3517 goto out;
3518 } else if (action == DAD_ABORT) {
3519 addrconf_dad_stop(ifp, 1);
3520 goto out;
3521 }
3522
3523 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3524 goto out;
3525
3526 write_lock_bh(&idev->lock);
3527 if (idev->dead || !(idev->if_flags & IF_READY)) {
3528 write_unlock_bh(&idev->lock);
3529 goto out;
3530 }
3531
3532 spin_lock(&ifp->lock);
3533 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3534 spin_unlock(&ifp->lock);
3535 write_unlock_bh(&idev->lock);
3536 goto out;
3537 }
3538
3539 if (ifp->dad_probes == 0) {
3540 /*
3541 * DAD was successful
3542 */
3543
3544 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3545 spin_unlock(&ifp->lock);
3546 write_unlock_bh(&idev->lock);
3547
3548 addrconf_dad_completed(ifp);
3549
3550 goto out;
3551 }
3552
3553 ifp->dad_probes--;
3554 addrconf_mod_dad_work(ifp,
3555 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3556 spin_unlock(&ifp->lock);
3557 write_unlock_bh(&idev->lock);
3558
3559 /* send a neighbour solicitation for our addr */
3560 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3561 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3562 out:
3563 in6_ifa_put(ifp);
3564 rtnl_unlock();
3565 }
3566
3567 /* ifp->idev must be at least read locked */
3568 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3569 {
3570 struct inet6_ifaddr *ifpiter;
3571 struct inet6_dev *idev = ifp->idev;
3572
3573 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3574 if (ifpiter->scope > IFA_LINK)
3575 break;
3576 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3577 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3578 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3579 IFA_F_PERMANENT)
3580 return false;
3581 }
3582 return true;
3583 }
3584
3585 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3586 {
3587 struct net_device *dev = ifp->idev->dev;
3588 struct in6_addr lladdr;
3589 bool send_rs, send_mld;
3590
3591 addrconf_del_dad_work(ifp);
3592
3593 /*
3594 * Configure the address for reception. Now it is valid.
3595 */
3596
3597 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3598
3599 /* If added prefix is link local and we are prepared to process
3600 router advertisements, start sending router solicitations.
3601 */
3602
3603 read_lock_bh(&ifp->idev->lock);
3604 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3605 send_rs = send_mld &&
3606 ipv6_accept_ra(ifp->idev) &&
3607 ifp->idev->cnf.rtr_solicits > 0 &&
3608 (dev->flags&IFF_LOOPBACK) == 0;
3609 read_unlock_bh(&ifp->idev->lock);
3610
3611 /* While dad is in progress mld report's source address is in6_addrany.
3612 * Resend with proper ll now.
3613 */
3614 if (send_mld)
3615 ipv6_mc_dad_complete(ifp->idev);
3616
3617 if (send_rs) {
3618 /*
3619 * If a host as already performed a random delay
3620 * [...] as part of DAD [...] there is no need
3621 * to delay again before sending the first RS
3622 */
3623 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3624 return;
3625 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3626
3627 write_lock_bh(&ifp->idev->lock);
3628 spin_lock(&ifp->lock);
3629 ifp->idev->rs_probes = 1;
3630 ifp->idev->if_flags |= IF_RS_SENT;
3631 addrconf_mod_rs_timer(ifp->idev,
3632 ifp->idev->cnf.rtr_solicit_interval);
3633 spin_unlock(&ifp->lock);
3634 write_unlock_bh(&ifp->idev->lock);
3635 }
3636 }
3637
3638 static void addrconf_dad_run(struct inet6_dev *idev)
3639 {
3640 struct inet6_ifaddr *ifp;
3641
3642 read_lock_bh(&idev->lock);
3643 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3644 spin_lock(&ifp->lock);
3645 if (ifp->flags & IFA_F_TENTATIVE &&
3646 ifp->state == INET6_IFADDR_STATE_DAD)
3647 addrconf_dad_kick(ifp);
3648 spin_unlock(&ifp->lock);
3649 }
3650 read_unlock_bh(&idev->lock);
3651 }
3652
3653 #ifdef CONFIG_PROC_FS
3654 struct if6_iter_state {
3655 struct seq_net_private p;
3656 int bucket;
3657 int offset;
3658 };
3659
3660 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3661 {
3662 struct inet6_ifaddr *ifa = NULL;
3663 struct if6_iter_state *state = seq->private;
3664 struct net *net = seq_file_net(seq);
3665 int p = 0;
3666
3667 /* initial bucket if pos is 0 */
3668 if (pos == 0) {
3669 state->bucket = 0;
3670 state->offset = 0;
3671 }
3672
3673 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3674 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3675 addr_lst) {
3676 if (!net_eq(dev_net(ifa->idev->dev), net))
3677 continue;
3678 /* sync with offset */
3679 if (p < state->offset) {
3680 p++;
3681 continue;
3682 }
3683 state->offset++;
3684 return ifa;
3685 }
3686
3687 /* prepare for next bucket */
3688 state->offset = 0;
3689 p = 0;
3690 }
3691 return NULL;
3692 }
3693
3694 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3695 struct inet6_ifaddr *ifa)
3696 {
3697 struct if6_iter_state *state = seq->private;
3698 struct net *net = seq_file_net(seq);
3699
3700 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3701 if (!net_eq(dev_net(ifa->idev->dev), net))
3702 continue;
3703 state->offset++;
3704 return ifa;
3705 }
3706
3707 while (++state->bucket < IN6_ADDR_HSIZE) {
3708 state->offset = 0;
3709 hlist_for_each_entry_rcu_bh(ifa,
3710 &inet6_addr_lst[state->bucket], addr_lst) {
3711 if (!net_eq(dev_net(ifa->idev->dev), net))
3712 continue;
3713 state->offset++;
3714 return ifa;
3715 }
3716 }
3717
3718 return NULL;
3719 }
3720
3721 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3722 __acquires(rcu_bh)
3723 {
3724 rcu_read_lock_bh();
3725 return if6_get_first(seq, *pos);
3726 }
3727
3728 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3729 {
3730 struct inet6_ifaddr *ifa;
3731
3732 ifa = if6_get_next(seq, v);
3733 ++*pos;
3734 return ifa;
3735 }
3736
3737 static void if6_seq_stop(struct seq_file *seq, void *v)
3738 __releases(rcu_bh)
3739 {
3740 rcu_read_unlock_bh();
3741 }
3742
3743 static int if6_seq_show(struct seq_file *seq, void *v)
3744 {
3745 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3746 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3747 &ifp->addr,
3748 ifp->idev->dev->ifindex,
3749 ifp->prefix_len,
3750 ifp->scope,
3751 (u8) ifp->flags,
3752 ifp->idev->dev->name);
3753 return 0;
3754 }
3755
3756 static const struct seq_operations if6_seq_ops = {
3757 .start = if6_seq_start,
3758 .next = if6_seq_next,
3759 .show = if6_seq_show,
3760 .stop = if6_seq_stop,
3761 };
3762
3763 static int if6_seq_open(struct inode *inode, struct file *file)
3764 {
3765 return seq_open_net(inode, file, &if6_seq_ops,
3766 sizeof(struct if6_iter_state));
3767 }
3768
3769 static const struct file_operations if6_fops = {
3770 .owner = THIS_MODULE,
3771 .open = if6_seq_open,
3772 .read = seq_read,
3773 .llseek = seq_lseek,
3774 .release = seq_release_net,
3775 };
3776
3777 static int __net_init if6_proc_net_init(struct net *net)
3778 {
3779 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3780 return -ENOMEM;
3781 return 0;
3782 }
3783
3784 static void __net_exit if6_proc_net_exit(struct net *net)
3785 {
3786 remove_proc_entry("if_inet6", net->proc_net);
3787 }
3788
3789 static struct pernet_operations if6_proc_net_ops = {
3790 .init = if6_proc_net_init,
3791 .exit = if6_proc_net_exit,
3792 };
3793
3794 int __init if6_proc_init(void)
3795 {
3796 return register_pernet_subsys(&if6_proc_net_ops);
3797 }
3798
3799 void if6_proc_exit(void)
3800 {
3801 unregister_pernet_subsys(&if6_proc_net_ops);
3802 }
3803 #endif /* CONFIG_PROC_FS */
3804
3805 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3806 /* Check if address is a home address configured on any interface. */
3807 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3808 {
3809 int ret = 0;
3810 struct inet6_ifaddr *ifp = NULL;
3811 unsigned int hash = inet6_addr_hash(addr);
3812
3813 rcu_read_lock_bh();
3814 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3815 if (!net_eq(dev_net(ifp->idev->dev), net))
3816 continue;
3817 if (ipv6_addr_equal(&ifp->addr, addr) &&
3818 (ifp->flags & IFA_F_HOMEADDRESS)) {
3819 ret = 1;
3820 break;
3821 }
3822 }
3823 rcu_read_unlock_bh();
3824 return ret;
3825 }
3826 #endif
3827
3828 /*
3829 * Periodic address status verification
3830 */
3831
3832 static void addrconf_verify_rtnl(void)
3833 {
3834 unsigned long now, next, next_sec, next_sched;
3835 struct inet6_ifaddr *ifp;
3836 int i;
3837
3838 ASSERT_RTNL();
3839
3840 rcu_read_lock_bh();
3841 now = jiffies;
3842 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3843
3844 cancel_delayed_work(&addr_chk_work);
3845
3846 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3847 restart:
3848 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3849 unsigned long age;
3850
3851 /* When setting preferred_lft to a value not zero or
3852 * infinity, while valid_lft is infinity
3853 * IFA_F_PERMANENT has a non-infinity life time.
3854 */
3855 if ((ifp->flags & IFA_F_PERMANENT) &&
3856 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3857 continue;
3858
3859 spin_lock(&ifp->lock);
3860 /* We try to batch several events at once. */
3861 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3862
3863 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3864 age >= ifp->valid_lft) {
3865 spin_unlock(&ifp->lock);
3866 in6_ifa_hold(ifp);
3867 ipv6_del_addr(ifp);
3868 goto restart;
3869 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3870 spin_unlock(&ifp->lock);
3871 continue;
3872 } else if (age >= ifp->prefered_lft) {
3873 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3874 int deprecate = 0;
3875
3876 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3877 deprecate = 1;
3878 ifp->flags |= IFA_F_DEPRECATED;
3879 }
3880
3881 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3882 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3883 next = ifp->tstamp + ifp->valid_lft * HZ;
3884
3885 spin_unlock(&ifp->lock);
3886
3887 if (deprecate) {
3888 in6_ifa_hold(ifp);
3889
3890 ipv6_ifa_notify(0, ifp);
3891 in6_ifa_put(ifp);
3892 goto restart;
3893 }
3894 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3895 !(ifp->flags&IFA_F_TENTATIVE)) {
3896 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3897 ifp->idev->cnf.dad_transmits *
3898 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3899
3900 if (age >= ifp->prefered_lft - regen_advance) {
3901 struct inet6_ifaddr *ifpub = ifp->ifpub;
3902 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3903 next = ifp->tstamp + ifp->prefered_lft * HZ;
3904 if (!ifp->regen_count && ifpub) {
3905 ifp->regen_count++;
3906 in6_ifa_hold(ifp);
3907 in6_ifa_hold(ifpub);
3908 spin_unlock(&ifp->lock);
3909
3910 spin_lock(&ifpub->lock);
3911 ifpub->regen_count = 0;
3912 spin_unlock(&ifpub->lock);
3913 ipv6_create_tempaddr(ifpub, ifp);
3914 in6_ifa_put(ifpub);
3915 in6_ifa_put(ifp);
3916 goto restart;
3917 }
3918 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3919 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3920 spin_unlock(&ifp->lock);
3921 } else {
3922 /* ifp->prefered_lft <= ifp->valid_lft */
3923 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3924 next = ifp->tstamp + ifp->prefered_lft * HZ;
3925 spin_unlock(&ifp->lock);
3926 }
3927 }
3928 }
3929
3930 next_sec = round_jiffies_up(next);
3931 next_sched = next;
3932
3933 /* If rounded timeout is accurate enough, accept it. */
3934 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3935 next_sched = next_sec;
3936
3937 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3938 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3939 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3940
3941 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3942 now, next, next_sec, next_sched);
3943 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
3944 rcu_read_unlock_bh();
3945 }
3946
3947 static void addrconf_verify_work(struct work_struct *w)
3948 {
3949 rtnl_lock();
3950 addrconf_verify_rtnl();
3951 rtnl_unlock();
3952 }
3953
3954 static void addrconf_verify(void)
3955 {
3956 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3957 }
3958
3959 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3960 struct in6_addr **peer_pfx)
3961 {
3962 struct in6_addr *pfx = NULL;
3963
3964 *peer_pfx = NULL;
3965
3966 if (addr)
3967 pfx = nla_data(addr);
3968
3969 if (local) {
3970 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3971 *peer_pfx = pfx;
3972 pfx = nla_data(local);
3973 }
3974
3975 return pfx;
3976 }
3977
3978 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3979 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3980 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3981 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3982 [IFA_FLAGS] = { .len = sizeof(u32) },
3983 };
3984
3985 static int
3986 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3987 {
3988 struct net *net = sock_net(skb->sk);
3989 struct ifaddrmsg *ifm;
3990 struct nlattr *tb[IFA_MAX+1];
3991 struct in6_addr *pfx, *peer_pfx;
3992 u32 ifa_flags;
3993 int err;
3994
3995 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3996 if (err < 0)
3997 return err;
3998
3999 ifm = nlmsg_data(nlh);
4000 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4001 if (!pfx)
4002 return -EINVAL;
4003
4004 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4005
4006 /* We ignore other flags so far. */
4007 ifa_flags &= IFA_F_MANAGETEMPADDR;
4008
4009 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4010 ifm->ifa_prefixlen);
4011 }
4012
4013 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4014 u32 prefered_lft, u32 valid_lft)
4015 {
4016 u32 flags;
4017 clock_t expires;
4018 unsigned long timeout;
4019 bool was_managetempaddr;
4020 bool had_prefixroute;
4021
4022 ASSERT_RTNL();
4023
4024 if (!valid_lft || (prefered_lft > valid_lft))
4025 return -EINVAL;
4026
4027 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4028 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4029 return -EINVAL;
4030
4031 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4032 if (addrconf_finite_timeout(timeout)) {
4033 expires = jiffies_to_clock_t(timeout * HZ);
4034 valid_lft = timeout;
4035 flags = RTF_EXPIRES;
4036 } else {
4037 expires = 0;
4038 flags = 0;
4039 ifa_flags |= IFA_F_PERMANENT;
4040 }
4041
4042 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4043 if (addrconf_finite_timeout(timeout)) {
4044 if (timeout == 0)
4045 ifa_flags |= IFA_F_DEPRECATED;
4046 prefered_lft = timeout;
4047 }
4048
4049 spin_lock_bh(&ifp->lock);
4050 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4051 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4052 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4053 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4054 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4055 IFA_F_NOPREFIXROUTE);
4056 ifp->flags |= ifa_flags;
4057 ifp->tstamp = jiffies;
4058 ifp->valid_lft = valid_lft;
4059 ifp->prefered_lft = prefered_lft;
4060
4061 spin_unlock_bh(&ifp->lock);
4062 if (!(ifp->flags&IFA_F_TENTATIVE))
4063 ipv6_ifa_notify(0, ifp);
4064
4065 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4066 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4067 expires, flags);
4068 } else if (had_prefixroute) {
4069 enum cleanup_prefix_rt_t action;
4070 unsigned long rt_expires;
4071
4072 write_lock_bh(&ifp->idev->lock);
4073 action = check_cleanup_prefix_route(ifp, &rt_expires);
4074 write_unlock_bh(&ifp->idev->lock);
4075
4076 if (action != CLEANUP_PREFIX_RT_NOP) {
4077 cleanup_prefix_route(ifp, rt_expires,
4078 action == CLEANUP_PREFIX_RT_DEL);
4079 }
4080 }
4081
4082 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4083 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4084 valid_lft = prefered_lft = 0;
4085 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4086 !was_managetempaddr, jiffies);
4087 }
4088
4089 addrconf_verify_rtnl();
4090
4091 return 0;
4092 }
4093
4094 static int
4095 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4096 {
4097 struct net *net = sock_net(skb->sk);
4098 struct ifaddrmsg *ifm;
4099 struct nlattr *tb[IFA_MAX+1];
4100 struct in6_addr *pfx, *peer_pfx;
4101 struct inet6_ifaddr *ifa;
4102 struct net_device *dev;
4103 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4104 u32 ifa_flags;
4105 int err;
4106
4107 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4108 if (err < 0)
4109 return err;
4110
4111 ifm = nlmsg_data(nlh);
4112 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4113 if (!pfx)
4114 return -EINVAL;
4115
4116 if (tb[IFA_CACHEINFO]) {
4117 struct ifa_cacheinfo *ci;
4118
4119 ci = nla_data(tb[IFA_CACHEINFO]);
4120 valid_lft = ci->ifa_valid;
4121 preferred_lft = ci->ifa_prefered;
4122 } else {
4123 preferred_lft = INFINITY_LIFE_TIME;
4124 valid_lft = INFINITY_LIFE_TIME;
4125 }
4126
4127 dev = __dev_get_by_index(net, ifm->ifa_index);
4128 if (!dev)
4129 return -ENODEV;
4130
4131 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4132
4133 /* We ignore other flags so far. */
4134 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4135 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4136
4137 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4138 if (!ifa) {
4139 /*
4140 * It would be best to check for !NLM_F_CREATE here but
4141 * userspace already relies on not having to provide this.
4142 */
4143 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4144 ifm->ifa_prefixlen, ifa_flags,
4145 preferred_lft, valid_lft);
4146 }
4147
4148 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4149 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4150 err = -EEXIST;
4151 else
4152 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4153
4154 in6_ifa_put(ifa);
4155
4156 return err;
4157 }
4158
4159 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4160 u8 scope, int ifindex)
4161 {
4162 struct ifaddrmsg *ifm;
4163
4164 ifm = nlmsg_data(nlh);
4165 ifm->ifa_family = AF_INET6;
4166 ifm->ifa_prefixlen = prefixlen;
4167 ifm->ifa_flags = flags;
4168 ifm->ifa_scope = scope;
4169 ifm->ifa_index = ifindex;
4170 }
4171
4172 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4173 unsigned long tstamp, u32 preferred, u32 valid)
4174 {
4175 struct ifa_cacheinfo ci;
4176
4177 ci.cstamp = cstamp_delta(cstamp);
4178 ci.tstamp = cstamp_delta(tstamp);
4179 ci.ifa_prefered = preferred;
4180 ci.ifa_valid = valid;
4181
4182 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4183 }
4184
4185 static inline int rt_scope(int ifa_scope)
4186 {
4187 if (ifa_scope & IFA_HOST)
4188 return RT_SCOPE_HOST;
4189 else if (ifa_scope & IFA_LINK)
4190 return RT_SCOPE_LINK;
4191 else if (ifa_scope & IFA_SITE)
4192 return RT_SCOPE_SITE;
4193 else
4194 return RT_SCOPE_UNIVERSE;
4195 }
4196
4197 static inline int inet6_ifaddr_msgsize(void)
4198 {
4199 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4200 + nla_total_size(16) /* IFA_LOCAL */
4201 + nla_total_size(16) /* IFA_ADDRESS */
4202 + nla_total_size(sizeof(struct ifa_cacheinfo))
4203 + nla_total_size(4) /* IFA_FLAGS */;
4204 }
4205
4206 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4207 u32 portid, u32 seq, int event, unsigned int flags)
4208 {
4209 struct nlmsghdr *nlh;
4210 u32 preferred, valid;
4211
4212 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4213 if (!nlh)
4214 return -EMSGSIZE;
4215
4216 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4217 ifa->idev->dev->ifindex);
4218
4219 if (!((ifa->flags&IFA_F_PERMANENT) &&
4220 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4221 preferred = ifa->prefered_lft;
4222 valid = ifa->valid_lft;
4223 if (preferred != INFINITY_LIFE_TIME) {
4224 long tval = (jiffies - ifa->tstamp)/HZ;
4225 if (preferred > tval)
4226 preferred -= tval;
4227 else
4228 preferred = 0;
4229 if (valid != INFINITY_LIFE_TIME) {
4230 if (valid > tval)
4231 valid -= tval;
4232 else
4233 valid = 0;
4234 }
4235 }
4236 } else {
4237 preferred = INFINITY_LIFE_TIME;
4238 valid = INFINITY_LIFE_TIME;
4239 }
4240
4241 if (!ipv6_addr_any(&ifa->peer_addr)) {
4242 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4243 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4244 goto error;
4245 } else
4246 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4247 goto error;
4248
4249 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4250 goto error;
4251
4252 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4253 goto error;
4254
4255 nlmsg_end(skb, nlh);
4256 return 0;
4257
4258 error:
4259 nlmsg_cancel(skb, nlh);
4260 return -EMSGSIZE;
4261 }
4262
4263 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4264 u32 portid, u32 seq, int event, u16 flags)
4265 {
4266 struct nlmsghdr *nlh;
4267 u8 scope = RT_SCOPE_UNIVERSE;
4268 int ifindex = ifmca->idev->dev->ifindex;
4269
4270 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4271 scope = RT_SCOPE_SITE;
4272
4273 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4274 if (!nlh)
4275 return -EMSGSIZE;
4276
4277 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4278 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4279 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4280 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4281 nlmsg_cancel(skb, nlh);
4282 return -EMSGSIZE;
4283 }
4284
4285 nlmsg_end(skb, nlh);
4286 return 0;
4287 }
4288
4289 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4290 u32 portid, u32 seq, int event, unsigned int flags)
4291 {
4292 struct nlmsghdr *nlh;
4293 u8 scope = RT_SCOPE_UNIVERSE;
4294 int ifindex = ifaca->aca_idev->dev->ifindex;
4295
4296 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4297 scope = RT_SCOPE_SITE;
4298
4299 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4300 if (!nlh)
4301 return -EMSGSIZE;
4302
4303 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4304 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4305 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4306 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4307 nlmsg_cancel(skb, nlh);
4308 return -EMSGSIZE;
4309 }
4310
4311 nlmsg_end(skb, nlh);
4312 return 0;
4313 }
4314
4315 enum addr_type_t {
4316 UNICAST_ADDR,
4317 MULTICAST_ADDR,
4318 ANYCAST_ADDR,
4319 };
4320
4321 /* called with rcu_read_lock() */
4322 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4323 struct netlink_callback *cb, enum addr_type_t type,
4324 int s_ip_idx, int *p_ip_idx)
4325 {
4326 struct ifmcaddr6 *ifmca;
4327 struct ifacaddr6 *ifaca;
4328 int err = 1;
4329 int ip_idx = *p_ip_idx;
4330
4331 read_lock_bh(&idev->lock);
4332 switch (type) {
4333 case UNICAST_ADDR: {
4334 struct inet6_ifaddr *ifa;
4335
4336 /* unicast address incl. temp addr */
4337 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4338 if (++ip_idx < s_ip_idx)
4339 continue;
4340 err = inet6_fill_ifaddr(skb, ifa,
4341 NETLINK_CB(cb->skb).portid,
4342 cb->nlh->nlmsg_seq,
4343 RTM_NEWADDR,
4344 NLM_F_MULTI);
4345 if (err < 0)
4346 break;
4347 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4348 }
4349 break;
4350 }
4351 case MULTICAST_ADDR:
4352 /* multicast address */
4353 for (ifmca = idev->mc_list; ifmca;
4354 ifmca = ifmca->next, ip_idx++) {
4355 if (ip_idx < s_ip_idx)
4356 continue;
4357 err = inet6_fill_ifmcaddr(skb, ifmca,
4358 NETLINK_CB(cb->skb).portid,
4359 cb->nlh->nlmsg_seq,
4360 RTM_GETMULTICAST,
4361 NLM_F_MULTI);
4362 if (err < 0)
4363 break;
4364 }
4365 break;
4366 case ANYCAST_ADDR:
4367 /* anycast address */
4368 for (ifaca = idev->ac_list; ifaca;
4369 ifaca = ifaca->aca_next, ip_idx++) {
4370 if (ip_idx < s_ip_idx)
4371 continue;
4372 err = inet6_fill_ifacaddr(skb, ifaca,
4373 NETLINK_CB(cb->skb).portid,
4374 cb->nlh->nlmsg_seq,
4375 RTM_GETANYCAST,
4376 NLM_F_MULTI);
4377 if (err < 0)
4378 break;
4379 }
4380 break;
4381 default:
4382 break;
4383 }
4384 read_unlock_bh(&idev->lock);
4385 *p_ip_idx = ip_idx;
4386 return err;
4387 }
4388
4389 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4390 enum addr_type_t type)
4391 {
4392 struct net *net = sock_net(skb->sk);
4393 int h, s_h;
4394 int idx, ip_idx;
4395 int s_idx, s_ip_idx;
4396 struct net_device *dev;
4397 struct inet6_dev *idev;
4398 struct hlist_head *head;
4399
4400 s_h = cb->args[0];
4401 s_idx = idx = cb->args[1];
4402 s_ip_idx = ip_idx = cb->args[2];
4403
4404 rcu_read_lock();
4405 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4406 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4407 idx = 0;
4408 head = &net->dev_index_head[h];
4409 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4410 if (idx < s_idx)
4411 goto cont;
4412 if (h > s_h || idx > s_idx)
4413 s_ip_idx = 0;
4414 ip_idx = 0;
4415 idev = __in6_dev_get(dev);
4416 if (!idev)
4417 goto cont;
4418
4419 if (in6_dump_addrs(idev, skb, cb, type,
4420 s_ip_idx, &ip_idx) < 0)
4421 goto done;
4422 cont:
4423 idx++;
4424 }
4425 }
4426 done:
4427 rcu_read_unlock();
4428 cb->args[0] = h;
4429 cb->args[1] = idx;
4430 cb->args[2] = ip_idx;
4431
4432 return skb->len;
4433 }
4434
4435 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4436 {
4437 enum addr_type_t type = UNICAST_ADDR;
4438
4439 return inet6_dump_addr(skb, cb, type);
4440 }
4441
4442 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4443 {
4444 enum addr_type_t type = MULTICAST_ADDR;
4445
4446 return inet6_dump_addr(skb, cb, type);
4447 }
4448
4449
4450 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4451 {
4452 enum addr_type_t type = ANYCAST_ADDR;
4453
4454 return inet6_dump_addr(skb, cb, type);
4455 }
4456
4457 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4458 {
4459 struct net *net = sock_net(in_skb->sk);
4460 struct ifaddrmsg *ifm;
4461 struct nlattr *tb[IFA_MAX+1];
4462 struct in6_addr *addr = NULL, *peer;
4463 struct net_device *dev = NULL;
4464 struct inet6_ifaddr *ifa;
4465 struct sk_buff *skb;
4466 int err;
4467
4468 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4469 if (err < 0)
4470 goto errout;
4471
4472 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4473 if (!addr) {
4474 err = -EINVAL;
4475 goto errout;
4476 }
4477
4478 ifm = nlmsg_data(nlh);
4479 if (ifm->ifa_index)
4480 dev = __dev_get_by_index(net, ifm->ifa_index);
4481
4482 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4483 if (!ifa) {
4484 err = -EADDRNOTAVAIL;
4485 goto errout;
4486 }
4487
4488 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4489 if (!skb) {
4490 err = -ENOBUFS;
4491 goto errout_ifa;
4492 }
4493
4494 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4495 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4496 if (err < 0) {
4497 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4498 WARN_ON(err == -EMSGSIZE);
4499 kfree_skb(skb);
4500 goto errout_ifa;
4501 }
4502 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4503 errout_ifa:
4504 in6_ifa_put(ifa);
4505 errout:
4506 return err;
4507 }
4508
4509 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4510 {
4511 struct sk_buff *skb;
4512 struct net *net = dev_net(ifa->idev->dev);
4513 int err = -ENOBUFS;
4514
4515 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4516 if (!skb)
4517 goto errout;
4518
4519 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4520 if (err < 0) {
4521 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4522 WARN_ON(err == -EMSGSIZE);
4523 kfree_skb(skb);
4524 goto errout;
4525 }
4526 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4527 return;
4528 errout:
4529 if (err < 0)
4530 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4531 }
4532
4533 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4534 __s32 *array, int bytes)
4535 {
4536 BUG_ON(bytes < (DEVCONF_MAX * 4));
4537
4538 memset(array, 0, bytes);
4539 array[DEVCONF_FORWARDING] = cnf->forwarding;
4540 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4541 array[DEVCONF_MTU6] = cnf->mtu6;
4542 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4543 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4544 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4545 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4546 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4547 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4548 jiffies_to_msecs(cnf->rtr_solicit_interval);
4549 array[DEVCONF_RTR_SOLICIT_DELAY] =
4550 jiffies_to_msecs(cnf->rtr_solicit_delay);
4551 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4552 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4553 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4554 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4555 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4556 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4557 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4558 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4559 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4560 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4561 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4562 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4563 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4564 #ifdef CONFIG_IPV6_ROUTER_PREF
4565 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4566 array[DEVCONF_RTR_PROBE_INTERVAL] =
4567 jiffies_to_msecs(cnf->rtr_probe_interval);
4568 #ifdef CONFIG_IPV6_ROUTE_INFO
4569 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4570 #endif
4571 #endif
4572 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4573 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4574 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4575 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4576 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4577 #endif
4578 #ifdef CONFIG_IPV6_MROUTE
4579 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4580 #endif
4581 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4582 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4583 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4584 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4585 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4586 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4587 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4588 /* we omit DEVCONF_STABLE_SECRET for now */
4589 }
4590
4591 static inline size_t inet6_ifla6_size(void)
4592 {
4593 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4594 + nla_total_size(sizeof(struct ifla_cacheinfo))
4595 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4596 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4597 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4598 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4599 }
4600
4601 static inline size_t inet6_if_nlmsg_size(void)
4602 {
4603 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4604 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4605 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4606 + nla_total_size(4) /* IFLA_MTU */
4607 + nla_total_size(4) /* IFLA_LINK */
4608 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4609 }
4610
4611 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4612 int items, int bytes)
4613 {
4614 int i;
4615 int pad = bytes - sizeof(u64) * items;
4616 BUG_ON(pad < 0);
4617
4618 /* Use put_unaligned() because stats may not be aligned for u64. */
4619 put_unaligned(items, &stats[0]);
4620 for (i = 1; i < items; i++)
4621 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4622
4623 memset(&stats[items], 0, pad);
4624 }
4625
4626 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4627 int items, int bytes, size_t syncpoff)
4628 {
4629 int i;
4630 int pad = bytes - sizeof(u64) * items;
4631 BUG_ON(pad < 0);
4632
4633 /* Use put_unaligned() because stats may not be aligned for u64. */
4634 put_unaligned(items, &stats[0]);
4635 for (i = 1; i < items; i++)
4636 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4637
4638 memset(&stats[items], 0, pad);
4639 }
4640
4641 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4642 int bytes)
4643 {
4644 switch (attrtype) {
4645 case IFLA_INET6_STATS:
4646 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4647 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4648 break;
4649 case IFLA_INET6_ICMP6STATS:
4650 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4651 break;
4652 }
4653 }
4654
4655 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4656 {
4657 struct nlattr *nla;
4658 struct ifla_cacheinfo ci;
4659
4660 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4661 goto nla_put_failure;
4662 ci.max_reasm_len = IPV6_MAXPLEN;
4663 ci.tstamp = cstamp_delta(idev->tstamp);
4664 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4665 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4666 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4667 goto nla_put_failure;
4668 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4669 if (!nla)
4670 goto nla_put_failure;
4671 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4672
4673 /* XXX - MC not implemented */
4674
4675 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4676 if (!nla)
4677 goto nla_put_failure;
4678 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4679
4680 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4681 if (!nla)
4682 goto nla_put_failure;
4683 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4684
4685 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4686 if (!nla)
4687 goto nla_put_failure;
4688
4689 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4690 goto nla_put_failure;
4691
4692 read_lock_bh(&idev->lock);
4693 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4694 read_unlock_bh(&idev->lock);
4695
4696 return 0;
4697
4698 nla_put_failure:
4699 return -EMSGSIZE;
4700 }
4701
4702 static size_t inet6_get_link_af_size(const struct net_device *dev)
4703 {
4704 if (!__in6_dev_get(dev))
4705 return 0;
4706
4707 return inet6_ifla6_size();
4708 }
4709
4710 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4711 {
4712 struct inet6_dev *idev = __in6_dev_get(dev);
4713
4714 if (!idev)
4715 return -ENODATA;
4716
4717 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4718 return -EMSGSIZE;
4719
4720 return 0;
4721 }
4722
4723 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4724 {
4725 struct inet6_ifaddr *ifp;
4726 struct net_device *dev = idev->dev;
4727 bool update_rs = false;
4728 struct in6_addr ll_addr;
4729
4730 ASSERT_RTNL();
4731
4732 if (!token)
4733 return -EINVAL;
4734 if (ipv6_addr_any(token))
4735 return -EINVAL;
4736 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4737 return -EINVAL;
4738 if (!ipv6_accept_ra(idev))
4739 return -EINVAL;
4740 if (idev->cnf.rtr_solicits <= 0)
4741 return -EINVAL;
4742
4743 write_lock_bh(&idev->lock);
4744
4745 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4746 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4747
4748 write_unlock_bh(&idev->lock);
4749
4750 if (!idev->dead && (idev->if_flags & IF_READY) &&
4751 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4752 IFA_F_OPTIMISTIC)) {
4753
4754 /* If we're not ready, then normal ifup will take care
4755 * of this. Otherwise, we need to request our rs here.
4756 */
4757 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4758 update_rs = true;
4759 }
4760
4761 write_lock_bh(&idev->lock);
4762
4763 if (update_rs) {
4764 idev->if_flags |= IF_RS_SENT;
4765 idev->rs_probes = 1;
4766 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4767 }
4768
4769 /* Well, that's kinda nasty ... */
4770 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4771 spin_lock(&ifp->lock);
4772 if (ifp->tokenized) {
4773 ifp->valid_lft = 0;
4774 ifp->prefered_lft = 0;
4775 }
4776 spin_unlock(&ifp->lock);
4777 }
4778
4779 write_unlock_bh(&idev->lock);
4780 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4781 addrconf_verify_rtnl();
4782 return 0;
4783 }
4784
4785 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4786 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4787 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4788 };
4789
4790 static int inet6_validate_link_af(const struct net_device *dev,
4791 const struct nlattr *nla)
4792 {
4793 struct nlattr *tb[IFLA_INET6_MAX + 1];
4794
4795 if (dev && !__in6_dev_get(dev))
4796 return -EAFNOSUPPORT;
4797
4798 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4799 }
4800
4801 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4802 {
4803 int err = -EINVAL;
4804 struct inet6_dev *idev = __in6_dev_get(dev);
4805 struct nlattr *tb[IFLA_INET6_MAX + 1];
4806
4807 if (!idev)
4808 return -EAFNOSUPPORT;
4809
4810 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4811 BUG();
4812
4813 if (tb[IFLA_INET6_TOKEN]) {
4814 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4815 if (err)
4816 return err;
4817 }
4818
4819 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4820 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4821
4822 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4823 mode != IN6_ADDR_GEN_MODE_NONE &&
4824 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4825 return -EINVAL;
4826
4827 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4828 !idev->cnf.stable_secret.initialized &&
4829 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4830 return -EINVAL;
4831
4832 idev->addr_gen_mode = mode;
4833 err = 0;
4834 }
4835
4836 return err;
4837 }
4838
4839 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4840 u32 portid, u32 seq, int event, unsigned int flags)
4841 {
4842 struct net_device *dev = idev->dev;
4843 struct ifinfomsg *hdr;
4844 struct nlmsghdr *nlh;
4845 void *protoinfo;
4846
4847 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4848 if (!nlh)
4849 return -EMSGSIZE;
4850
4851 hdr = nlmsg_data(nlh);
4852 hdr->ifi_family = AF_INET6;
4853 hdr->__ifi_pad = 0;
4854 hdr->ifi_type = dev->type;
4855 hdr->ifi_index = dev->ifindex;
4856 hdr->ifi_flags = dev_get_flags(dev);
4857 hdr->ifi_change = 0;
4858
4859 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4860 (dev->addr_len &&
4861 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4862 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4863 (dev->ifindex != dev_get_iflink(dev) &&
4864 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4865 goto nla_put_failure;
4866 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4867 if (!protoinfo)
4868 goto nla_put_failure;
4869
4870 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4871 goto nla_put_failure;
4872
4873 nla_nest_end(skb, protoinfo);
4874 nlmsg_end(skb, nlh);
4875 return 0;
4876
4877 nla_put_failure:
4878 nlmsg_cancel(skb, nlh);
4879 return -EMSGSIZE;
4880 }
4881
4882 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4883 {
4884 struct net *net = sock_net(skb->sk);
4885 int h, s_h;
4886 int idx = 0, s_idx;
4887 struct net_device *dev;
4888 struct inet6_dev *idev;
4889 struct hlist_head *head;
4890
4891 s_h = cb->args[0];
4892 s_idx = cb->args[1];
4893
4894 rcu_read_lock();
4895 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4896 idx = 0;
4897 head = &net->dev_index_head[h];
4898 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4899 if (idx < s_idx)
4900 goto cont;
4901 idev = __in6_dev_get(dev);
4902 if (!idev)
4903 goto cont;
4904 if (inet6_fill_ifinfo(skb, idev,
4905 NETLINK_CB(cb->skb).portid,
4906 cb->nlh->nlmsg_seq,
4907 RTM_NEWLINK, NLM_F_MULTI) < 0)
4908 goto out;
4909 cont:
4910 idx++;
4911 }
4912 }
4913 out:
4914 rcu_read_unlock();
4915 cb->args[1] = idx;
4916 cb->args[0] = h;
4917
4918 return skb->len;
4919 }
4920
4921 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4922 {
4923 struct sk_buff *skb;
4924 struct net *net = dev_net(idev->dev);
4925 int err = -ENOBUFS;
4926
4927 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4928 if (!skb)
4929 goto errout;
4930
4931 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4932 if (err < 0) {
4933 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4934 WARN_ON(err == -EMSGSIZE);
4935 kfree_skb(skb);
4936 goto errout;
4937 }
4938 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4939 return;
4940 errout:
4941 if (err < 0)
4942 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4943 }
4944
4945 static inline size_t inet6_prefix_nlmsg_size(void)
4946 {
4947 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4948 + nla_total_size(sizeof(struct in6_addr))
4949 + nla_total_size(sizeof(struct prefix_cacheinfo));
4950 }
4951
4952 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4953 struct prefix_info *pinfo, u32 portid, u32 seq,
4954 int event, unsigned int flags)
4955 {
4956 struct prefixmsg *pmsg;
4957 struct nlmsghdr *nlh;
4958 struct prefix_cacheinfo ci;
4959
4960 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4961 if (!nlh)
4962 return -EMSGSIZE;
4963
4964 pmsg = nlmsg_data(nlh);
4965 pmsg->prefix_family = AF_INET6;
4966 pmsg->prefix_pad1 = 0;
4967 pmsg->prefix_pad2 = 0;
4968 pmsg->prefix_ifindex = idev->dev->ifindex;
4969 pmsg->prefix_len = pinfo->prefix_len;
4970 pmsg->prefix_type = pinfo->type;
4971 pmsg->prefix_pad3 = 0;
4972 pmsg->prefix_flags = 0;
4973 if (pinfo->onlink)
4974 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4975 if (pinfo->autoconf)
4976 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4977
4978 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4979 goto nla_put_failure;
4980 ci.preferred_time = ntohl(pinfo->prefered);
4981 ci.valid_time = ntohl(pinfo->valid);
4982 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4983 goto nla_put_failure;
4984 nlmsg_end(skb, nlh);
4985 return 0;
4986
4987 nla_put_failure:
4988 nlmsg_cancel(skb, nlh);
4989 return -EMSGSIZE;
4990 }
4991
4992 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4993 struct prefix_info *pinfo)
4994 {
4995 struct sk_buff *skb;
4996 struct net *net = dev_net(idev->dev);
4997 int err = -ENOBUFS;
4998
4999 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5000 if (!skb)
5001 goto errout;
5002
5003 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5004 if (err < 0) {
5005 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5006 WARN_ON(err == -EMSGSIZE);
5007 kfree_skb(skb);
5008 goto errout;
5009 }
5010 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5011 return;
5012 errout:
5013 if (err < 0)
5014 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5015 }
5016
5017 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5018 {
5019 struct net *net = dev_net(ifp->idev->dev);
5020
5021 if (event)
5022 ASSERT_RTNL();
5023
5024 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5025
5026 switch (event) {
5027 case RTM_NEWADDR:
5028 /*
5029 * If the address was optimistic
5030 * we inserted the route at the start of
5031 * our DAD process, so we don't need
5032 * to do it again
5033 */
5034 if (!(ifp->rt->rt6i_node))
5035 ip6_ins_rt(ifp->rt);
5036 if (ifp->idev->cnf.forwarding)
5037 addrconf_join_anycast(ifp);
5038 if (!ipv6_addr_any(&ifp->peer_addr))
5039 addrconf_prefix_route(&ifp->peer_addr, 128,
5040 ifp->idev->dev, 0, 0);
5041 break;
5042 case RTM_DELADDR:
5043 if (ifp->idev->cnf.forwarding)
5044 addrconf_leave_anycast(ifp);
5045 addrconf_leave_solict(ifp->idev, &ifp->addr);
5046 if (!ipv6_addr_any(&ifp->peer_addr)) {
5047 struct rt6_info *rt;
5048
5049 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5050 ifp->idev->dev, 0, 0);
5051 if (rt && ip6_del_rt(rt))
5052 dst_free(&rt->dst);
5053 }
5054 dst_hold(&ifp->rt->dst);
5055
5056 if (ip6_del_rt(ifp->rt))
5057 dst_free(&ifp->rt->dst);
5058
5059 rt_genid_bump_ipv6(net);
5060 break;
5061 }
5062 atomic_inc(&net->ipv6.dev_addr_genid);
5063 }
5064
5065 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5066 {
5067 rcu_read_lock_bh();
5068 if (likely(ifp->idev->dead == 0))
5069 __ipv6_ifa_notify(event, ifp);
5070 rcu_read_unlock_bh();
5071 }
5072
5073 #ifdef CONFIG_SYSCTL
5074
5075 static
5076 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5077 void __user *buffer, size_t *lenp, loff_t *ppos)
5078 {
5079 int *valp = ctl->data;
5080 int val = *valp;
5081 loff_t pos = *ppos;
5082 struct ctl_table lctl;
5083 int ret;
5084
5085 /*
5086 * ctl->data points to idev->cnf.forwarding, we should
5087 * not modify it until we get the rtnl lock.
5088 */
5089 lctl = *ctl;
5090 lctl.data = &val;
5091
5092 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5093
5094 if (write)
5095 ret = addrconf_fixup_forwarding(ctl, valp, val);
5096 if (ret)
5097 *ppos = pos;
5098 return ret;
5099 }
5100
5101 static
5102 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5103 void __user *buffer, size_t *lenp, loff_t *ppos)
5104 {
5105 struct inet6_dev *idev = ctl->extra1;
5106 int min_mtu = IPV6_MIN_MTU;
5107 struct ctl_table lctl;
5108
5109 lctl = *ctl;
5110 lctl.extra1 = &min_mtu;
5111 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5112
5113 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5114 }
5115
5116 static void dev_disable_change(struct inet6_dev *idev)
5117 {
5118 struct netdev_notifier_info info;
5119
5120 if (!idev || !idev->dev)
5121 return;
5122
5123 netdev_notifier_info_init(&info, idev->dev);
5124 if (idev->cnf.disable_ipv6)
5125 addrconf_notify(NULL, NETDEV_DOWN, &info);
5126 else
5127 addrconf_notify(NULL, NETDEV_UP, &info);
5128 }
5129
5130 static void addrconf_disable_change(struct net *net, __s32 newf)
5131 {
5132 struct net_device *dev;
5133 struct inet6_dev *idev;
5134
5135 rcu_read_lock();
5136 for_each_netdev_rcu(net, dev) {
5137 idev = __in6_dev_get(dev);
5138 if (idev) {
5139 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5140 idev->cnf.disable_ipv6 = newf;
5141 if (changed)
5142 dev_disable_change(idev);
5143 }
5144 }
5145 rcu_read_unlock();
5146 }
5147
5148 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5149 {
5150 struct net *net;
5151 int old;
5152
5153 if (!rtnl_trylock())
5154 return restart_syscall();
5155
5156 net = (struct net *)table->extra2;
5157 old = *p;
5158 *p = newf;
5159
5160 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5161 rtnl_unlock();
5162 return 0;
5163 }
5164
5165 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5166 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5167 addrconf_disable_change(net, newf);
5168 } else if ((!newf) ^ (!old))
5169 dev_disable_change((struct inet6_dev *)table->extra1);
5170
5171 rtnl_unlock();
5172 return 0;
5173 }
5174
5175 static
5176 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5177 void __user *buffer, size_t *lenp, loff_t *ppos)
5178 {
5179 int *valp = ctl->data;
5180 int val = *valp;
5181 loff_t pos = *ppos;
5182 struct ctl_table lctl;
5183 int ret;
5184
5185 /*
5186 * ctl->data points to idev->cnf.disable_ipv6, we should
5187 * not modify it until we get the rtnl lock.
5188 */
5189 lctl = *ctl;
5190 lctl.data = &val;
5191
5192 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5193
5194 if (write)
5195 ret = addrconf_disable_ipv6(ctl, valp, val);
5196 if (ret)
5197 *ppos = pos;
5198 return ret;
5199 }
5200
5201 static
5202 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5203 void __user *buffer, size_t *lenp, loff_t *ppos)
5204 {
5205 int *valp = ctl->data;
5206 int ret;
5207 int old, new;
5208
5209 old = *valp;
5210 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5211 new = *valp;
5212
5213 if (write && old != new) {
5214 struct net *net = ctl->extra2;
5215
5216 if (!rtnl_trylock())
5217 return restart_syscall();
5218
5219 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5220 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5221 NETCONFA_IFINDEX_DEFAULT,
5222 net->ipv6.devconf_dflt);
5223 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5224 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5225 NETCONFA_IFINDEX_ALL,
5226 net->ipv6.devconf_all);
5227 else {
5228 struct inet6_dev *idev = ctl->extra1;
5229
5230 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5231 idev->dev->ifindex,
5232 &idev->cnf);
5233 }
5234 rtnl_unlock();
5235 }
5236
5237 return ret;
5238 }
5239
5240 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5241 void __user *buffer, size_t *lenp,
5242 loff_t *ppos)
5243 {
5244 int err;
5245 struct in6_addr addr;
5246 char str[IPV6_MAX_STRLEN];
5247 struct ctl_table lctl = *ctl;
5248 struct net *net = ctl->extra2;
5249 struct ipv6_stable_secret *secret = ctl->data;
5250
5251 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5252 return -EIO;
5253
5254 lctl.maxlen = IPV6_MAX_STRLEN;
5255 lctl.data = str;
5256
5257 if (!rtnl_trylock())
5258 return restart_syscall();
5259
5260 if (!write && !secret->initialized) {
5261 err = -EIO;
5262 goto out;
5263 }
5264
5265 if (!write) {
5266 err = snprintf(str, sizeof(str), "%pI6",
5267 &secret->secret);
5268 if (err >= sizeof(str)) {
5269 err = -EIO;
5270 goto out;
5271 }
5272 }
5273
5274 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5275 if (err || !write)
5276 goto out;
5277
5278 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5279 err = -EIO;
5280 goto out;
5281 }
5282
5283 secret->initialized = true;
5284 secret->secret = addr;
5285
5286 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5287 struct net_device *dev;
5288
5289 for_each_netdev(net, dev) {
5290 struct inet6_dev *idev = __in6_dev_get(dev);
5291
5292 if (idev) {
5293 idev->addr_gen_mode =
5294 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5295 }
5296 }
5297 } else {
5298 struct inet6_dev *idev = ctl->extra1;
5299
5300 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5301 }
5302
5303 out:
5304 rtnl_unlock();
5305
5306 return err;
5307 }
5308
5309 static struct addrconf_sysctl_table
5310 {
5311 struct ctl_table_header *sysctl_header;
5312 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5313 } addrconf_sysctl __read_mostly = {
5314 .sysctl_header = NULL,
5315 .addrconf_vars = {
5316 {
5317 .procname = "forwarding",
5318 .data = &ipv6_devconf.forwarding,
5319 .maxlen = sizeof(int),
5320 .mode = 0644,
5321 .proc_handler = addrconf_sysctl_forward,
5322 },
5323 {
5324 .procname = "hop_limit",
5325 .data = &ipv6_devconf.hop_limit,
5326 .maxlen = sizeof(int),
5327 .mode = 0644,
5328 .proc_handler = proc_dointvec,
5329 },
5330 {
5331 .procname = "mtu",
5332 .data = &ipv6_devconf.mtu6,
5333 .maxlen = sizeof(int),
5334 .mode = 0644,
5335 .proc_handler = addrconf_sysctl_mtu,
5336 },
5337 {
5338 .procname = "accept_ra",
5339 .data = &ipv6_devconf.accept_ra,
5340 .maxlen = sizeof(int),
5341 .mode = 0644,
5342 .proc_handler = proc_dointvec,
5343 },
5344 {
5345 .procname = "accept_redirects",
5346 .data = &ipv6_devconf.accept_redirects,
5347 .maxlen = sizeof(int),
5348 .mode = 0644,
5349 .proc_handler = proc_dointvec,
5350 },
5351 {
5352 .procname = "autoconf",
5353 .data = &ipv6_devconf.autoconf,
5354 .maxlen = sizeof(int),
5355 .mode = 0644,
5356 .proc_handler = proc_dointvec,
5357 },
5358 {
5359 .procname = "dad_transmits",
5360 .data = &ipv6_devconf.dad_transmits,
5361 .maxlen = sizeof(int),
5362 .mode = 0644,
5363 .proc_handler = proc_dointvec,
5364 },
5365 {
5366 .procname = "router_solicitations",
5367 .data = &ipv6_devconf.rtr_solicits,
5368 .maxlen = sizeof(int),
5369 .mode = 0644,
5370 .proc_handler = proc_dointvec,
5371 },
5372 {
5373 .procname = "router_solicitation_interval",
5374 .data = &ipv6_devconf.rtr_solicit_interval,
5375 .maxlen = sizeof(int),
5376 .mode = 0644,
5377 .proc_handler = proc_dointvec_jiffies,
5378 },
5379 {
5380 .procname = "router_solicitation_delay",
5381 .data = &ipv6_devconf.rtr_solicit_delay,
5382 .maxlen = sizeof(int),
5383 .mode = 0644,
5384 .proc_handler = proc_dointvec_jiffies,
5385 },
5386 {
5387 .procname = "force_mld_version",
5388 .data = &ipv6_devconf.force_mld_version,
5389 .maxlen = sizeof(int),
5390 .mode = 0644,
5391 .proc_handler = proc_dointvec,
5392 },
5393 {
5394 .procname = "mldv1_unsolicited_report_interval",
5395 .data =
5396 &ipv6_devconf.mldv1_unsolicited_report_interval,
5397 .maxlen = sizeof(int),
5398 .mode = 0644,
5399 .proc_handler = proc_dointvec_ms_jiffies,
5400 },
5401 {
5402 .procname = "mldv2_unsolicited_report_interval",
5403 .data =
5404 &ipv6_devconf.mldv2_unsolicited_report_interval,
5405 .maxlen = sizeof(int),
5406 .mode = 0644,
5407 .proc_handler = proc_dointvec_ms_jiffies,
5408 },
5409 {
5410 .procname = "use_tempaddr",
5411 .data = &ipv6_devconf.use_tempaddr,
5412 .maxlen = sizeof(int),
5413 .mode = 0644,
5414 .proc_handler = proc_dointvec,
5415 },
5416 {
5417 .procname = "temp_valid_lft",
5418 .data = &ipv6_devconf.temp_valid_lft,
5419 .maxlen = sizeof(int),
5420 .mode = 0644,
5421 .proc_handler = proc_dointvec,
5422 },
5423 {
5424 .procname = "temp_prefered_lft",
5425 .data = &ipv6_devconf.temp_prefered_lft,
5426 .maxlen = sizeof(int),
5427 .mode = 0644,
5428 .proc_handler = proc_dointvec,
5429 },
5430 {
5431 .procname = "regen_max_retry",
5432 .data = &ipv6_devconf.regen_max_retry,
5433 .maxlen = sizeof(int),
5434 .mode = 0644,
5435 .proc_handler = proc_dointvec,
5436 },
5437 {
5438 .procname = "max_desync_factor",
5439 .data = &ipv6_devconf.max_desync_factor,
5440 .maxlen = sizeof(int),
5441 .mode = 0644,
5442 .proc_handler = proc_dointvec,
5443 },
5444 {
5445 .procname = "max_addresses",
5446 .data = &ipv6_devconf.max_addresses,
5447 .maxlen = sizeof(int),
5448 .mode = 0644,
5449 .proc_handler = proc_dointvec,
5450 },
5451 {
5452 .procname = "accept_ra_defrtr",
5453 .data = &ipv6_devconf.accept_ra_defrtr,
5454 .maxlen = sizeof(int),
5455 .mode = 0644,
5456 .proc_handler = proc_dointvec,
5457 },
5458 {
5459 .procname = "accept_ra_pinfo",
5460 .data = &ipv6_devconf.accept_ra_pinfo,
5461 .maxlen = sizeof(int),
5462 .mode = 0644,
5463 .proc_handler = proc_dointvec,
5464 },
5465 #ifdef CONFIG_IPV6_ROUTER_PREF
5466 {
5467 .procname = "accept_ra_rtr_pref",
5468 .data = &ipv6_devconf.accept_ra_rtr_pref,
5469 .maxlen = sizeof(int),
5470 .mode = 0644,
5471 .proc_handler = proc_dointvec,
5472 },
5473 {
5474 .procname = "router_probe_interval",
5475 .data = &ipv6_devconf.rtr_probe_interval,
5476 .maxlen = sizeof(int),
5477 .mode = 0644,
5478 .proc_handler = proc_dointvec_jiffies,
5479 },
5480 #ifdef CONFIG_IPV6_ROUTE_INFO
5481 {
5482 .procname = "accept_ra_rt_info_max_plen",
5483 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5484 .maxlen = sizeof(int),
5485 .mode = 0644,
5486 .proc_handler = proc_dointvec,
5487 },
5488 #endif
5489 #endif
5490 {
5491 .procname = "proxy_ndp",
5492 .data = &ipv6_devconf.proxy_ndp,
5493 .maxlen = sizeof(int),
5494 .mode = 0644,
5495 .proc_handler = addrconf_sysctl_proxy_ndp,
5496 },
5497 {
5498 .procname = "accept_source_route",
5499 .data = &ipv6_devconf.accept_source_route,
5500 .maxlen = sizeof(int),
5501 .mode = 0644,
5502 .proc_handler = proc_dointvec,
5503 },
5504 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5505 {
5506 .procname = "optimistic_dad",
5507 .data = &ipv6_devconf.optimistic_dad,
5508 .maxlen = sizeof(int),
5509 .mode = 0644,
5510 .proc_handler = proc_dointvec,
5511
5512 },
5513 {
5514 .procname = "use_optimistic",
5515 .data = &ipv6_devconf.use_optimistic,
5516 .maxlen = sizeof(int),
5517 .mode = 0644,
5518 .proc_handler = proc_dointvec,
5519
5520 },
5521 #endif
5522 #ifdef CONFIG_IPV6_MROUTE
5523 {
5524 .procname = "mc_forwarding",
5525 .data = &ipv6_devconf.mc_forwarding,
5526 .maxlen = sizeof(int),
5527 .mode = 0444,
5528 .proc_handler = proc_dointvec,
5529 },
5530 #endif
5531 {
5532 .procname = "disable_ipv6",
5533 .data = &ipv6_devconf.disable_ipv6,
5534 .maxlen = sizeof(int),
5535 .mode = 0644,
5536 .proc_handler = addrconf_sysctl_disable,
5537 },
5538 {
5539 .procname = "accept_dad",
5540 .data = &ipv6_devconf.accept_dad,
5541 .maxlen = sizeof(int),
5542 .mode = 0644,
5543 .proc_handler = proc_dointvec,
5544 },
5545 {
5546 .procname = "force_tllao",
5547 .data = &ipv6_devconf.force_tllao,
5548 .maxlen = sizeof(int),
5549 .mode = 0644,
5550 .proc_handler = proc_dointvec
5551 },
5552 {
5553 .procname = "ndisc_notify",
5554 .data = &ipv6_devconf.ndisc_notify,
5555 .maxlen = sizeof(int),
5556 .mode = 0644,
5557 .proc_handler = proc_dointvec
5558 },
5559 {
5560 .procname = "suppress_frag_ndisc",
5561 .data = &ipv6_devconf.suppress_frag_ndisc,
5562 .maxlen = sizeof(int),
5563 .mode = 0644,
5564 .proc_handler = proc_dointvec
5565 },
5566 {
5567 .procname = "accept_ra_from_local",
5568 .data = &ipv6_devconf.accept_ra_from_local,
5569 .maxlen = sizeof(int),
5570 .mode = 0644,
5571 .proc_handler = proc_dointvec,
5572 },
5573 {
5574 .procname = "accept_ra_mtu",
5575 .data = &ipv6_devconf.accept_ra_mtu,
5576 .maxlen = sizeof(int),
5577 .mode = 0644,
5578 .proc_handler = proc_dointvec,
5579 },
5580 {
5581 .procname = "stable_secret",
5582 .data = &ipv6_devconf.stable_secret,
5583 .maxlen = IPV6_MAX_STRLEN,
5584 .mode = 0600,
5585 .proc_handler = addrconf_sysctl_stable_secret,
5586 },
5587 {
5588 /* sentinel */
5589 }
5590 },
5591 };
5592
5593 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5594 struct inet6_dev *idev, struct ipv6_devconf *p)
5595 {
5596 int i;
5597 struct addrconf_sysctl_table *t;
5598 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5599
5600 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5601 if (!t)
5602 goto out;
5603
5604 for (i = 0; t->addrconf_vars[i].data; i++) {
5605 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5606 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5607 t->addrconf_vars[i].extra2 = net;
5608 }
5609
5610 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5611
5612 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5613 if (!t->sysctl_header)
5614 goto free;
5615
5616 p->sysctl = t;
5617 return 0;
5618
5619 free:
5620 kfree(t);
5621 out:
5622 return -ENOBUFS;
5623 }
5624
5625 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5626 {
5627 struct addrconf_sysctl_table *t;
5628
5629 if (!p->sysctl)
5630 return;
5631
5632 t = p->sysctl;
5633 p->sysctl = NULL;
5634 unregister_net_sysctl_table(t->sysctl_header);
5635 kfree(t);
5636 }
5637
5638 static int addrconf_sysctl_register(struct inet6_dev *idev)
5639 {
5640 int err;
5641
5642 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5643 return -EINVAL;
5644
5645 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5646 &ndisc_ifinfo_sysctl_change);
5647 if (err)
5648 return err;
5649 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5650 idev, &idev->cnf);
5651 if (err)
5652 neigh_sysctl_unregister(idev->nd_parms);
5653
5654 return err;
5655 }
5656
5657 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5658 {
5659 __addrconf_sysctl_unregister(&idev->cnf);
5660 neigh_sysctl_unregister(idev->nd_parms);
5661 }
5662
5663
5664 #endif
5665
5666 static int __net_init addrconf_init_net(struct net *net)
5667 {
5668 int err = -ENOMEM;
5669 struct ipv6_devconf *all, *dflt;
5670
5671 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5672 if (!all)
5673 goto err_alloc_all;
5674
5675 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5676 if (!dflt)
5677 goto err_alloc_dflt;
5678
5679 /* these will be inherited by all namespaces */
5680 dflt->autoconf = ipv6_defaults.autoconf;
5681 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5682
5683 dflt->stable_secret.initialized = false;
5684 all->stable_secret.initialized = false;
5685
5686 net->ipv6.devconf_all = all;
5687 net->ipv6.devconf_dflt = dflt;
5688
5689 #ifdef CONFIG_SYSCTL
5690 err = __addrconf_sysctl_register(net, "all", NULL, all);
5691 if (err < 0)
5692 goto err_reg_all;
5693
5694 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5695 if (err < 0)
5696 goto err_reg_dflt;
5697 #endif
5698 return 0;
5699
5700 #ifdef CONFIG_SYSCTL
5701 err_reg_dflt:
5702 __addrconf_sysctl_unregister(all);
5703 err_reg_all:
5704 kfree(dflt);
5705 #endif
5706 err_alloc_dflt:
5707 kfree(all);
5708 err_alloc_all:
5709 return err;
5710 }
5711
5712 static void __net_exit addrconf_exit_net(struct net *net)
5713 {
5714 #ifdef CONFIG_SYSCTL
5715 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5716 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5717 #endif
5718 kfree(net->ipv6.devconf_dflt);
5719 kfree(net->ipv6.devconf_all);
5720 }
5721
5722 static struct pernet_operations addrconf_ops = {
5723 .init = addrconf_init_net,
5724 .exit = addrconf_exit_net,
5725 };
5726
5727 static struct rtnl_af_ops inet6_ops __read_mostly = {
5728 .family = AF_INET6,
5729 .fill_link_af = inet6_fill_link_af,
5730 .get_link_af_size = inet6_get_link_af_size,
5731 .validate_link_af = inet6_validate_link_af,
5732 .set_link_af = inet6_set_link_af,
5733 };
5734
5735 /*
5736 * Init / cleanup code
5737 */
5738
5739 int __init addrconf_init(void)
5740 {
5741 struct inet6_dev *idev;
5742 int i, err;
5743
5744 err = ipv6_addr_label_init();
5745 if (err < 0) {
5746 pr_crit("%s: cannot initialize default policy table: %d\n",
5747 __func__, err);
5748 goto out;
5749 }
5750
5751 err = register_pernet_subsys(&addrconf_ops);
5752 if (err < 0)
5753 goto out_addrlabel;
5754
5755 addrconf_wq = create_workqueue("ipv6_addrconf");
5756 if (!addrconf_wq) {
5757 err = -ENOMEM;
5758 goto out_nowq;
5759 }
5760
5761 /* The addrconf netdev notifier requires that loopback_dev
5762 * has it's ipv6 private information allocated and setup
5763 * before it can bring up and give link-local addresses
5764 * to other devices which are up.
5765 *
5766 * Unfortunately, loopback_dev is not necessarily the first
5767 * entry in the global dev_base list of net devices. In fact,
5768 * it is likely to be the very last entry on that list.
5769 * So this causes the notifier registry below to try and
5770 * give link-local addresses to all devices besides loopback_dev
5771 * first, then loopback_dev, which cases all the non-loopback_dev
5772 * devices to fail to get a link-local address.
5773 *
5774 * So, as a temporary fix, allocate the ipv6 structure for
5775 * loopback_dev first by hand.
5776 * Longer term, all of the dependencies ipv6 has upon the loopback
5777 * device and it being up should be removed.
5778 */
5779 rtnl_lock();
5780 idev = ipv6_add_dev(init_net.loopback_dev);
5781 rtnl_unlock();
5782 if (IS_ERR(idev)) {
5783 err = PTR_ERR(idev);
5784 goto errlo;
5785 }
5786
5787 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5788 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5789
5790 register_netdevice_notifier(&ipv6_dev_notf);
5791
5792 addrconf_verify();
5793
5794 rtnl_af_register(&inet6_ops);
5795
5796 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5797 NULL);
5798 if (err < 0)
5799 goto errout;
5800
5801 /* Only the first call to __rtnl_register can fail */
5802 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5803 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5804 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5805 inet6_dump_ifaddr, NULL);
5806 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5807 inet6_dump_ifmcaddr, NULL);
5808 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5809 inet6_dump_ifacaddr, NULL);
5810 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5811 inet6_netconf_dump_devconf, NULL);
5812
5813 ipv6_addr_label_rtnl_register();
5814
5815 return 0;
5816 errout:
5817 rtnl_af_unregister(&inet6_ops);
5818 unregister_netdevice_notifier(&ipv6_dev_notf);
5819 errlo:
5820 destroy_workqueue(addrconf_wq);
5821 out_nowq:
5822 unregister_pernet_subsys(&addrconf_ops);
5823 out_addrlabel:
5824 ipv6_addr_label_cleanup();
5825 out:
5826 return err;
5827 }
5828
5829 void addrconf_cleanup(void)
5830 {
5831 struct net_device *dev;
5832 int i;
5833
5834 unregister_netdevice_notifier(&ipv6_dev_notf);
5835 unregister_pernet_subsys(&addrconf_ops);
5836 ipv6_addr_label_cleanup();
5837
5838 rtnl_lock();
5839
5840 __rtnl_af_unregister(&inet6_ops);
5841
5842 /* clean dev list */
5843 for_each_netdev(&init_net, dev) {
5844 if (__in6_dev_get(dev) == NULL)
5845 continue;
5846 addrconf_ifdown(dev, 1);
5847 }
5848 addrconf_ifdown(init_net.loopback_dev, 2);
5849
5850 /*
5851 * Check hash table.
5852 */
5853 spin_lock_bh(&addrconf_hash_lock);
5854 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5855 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5856 spin_unlock_bh(&addrconf_hash_lock);
5857 cancel_delayed_work(&addr_chk_work);
5858 rtnl_unlock();
5859
5860 destroy_workqueue(addrconf_wq);
5861 }
Linux with added FPC-III support