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Merge tag 'iwlwifi-next-for-kalle-2015-08-18' of https://git.kernel.org/pub/scm/linux...
[mirror_ubuntu-jammy-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_addr.h>
53 #include <linux/if_arp.h>
54 #include <linux/if_arcnet.h>
55 #include <linux/if_infiniband.h>
56 #include <linux/route.h>
57 #include <linux/inetdevice.h>
58 #include <linux/init.h>
59 #include <linux/slab.h>
60 #ifdef CONFIG_SYSCTL
61 #include <linux/sysctl.h>
62 #endif
63 #include <linux/capability.h>
64 #include <linux/delay.h>
65 #include <linux/notifier.h>
66 #include <linux/string.h>
67 #include <linux/hash.h>
68
69 #include <net/net_namespace.h>
70 #include <net/sock.h>
71 #include <net/snmp.h>
72
73 #include <net/af_ieee802154.h>
74 #include <net/firewire.h>
75 #include <net/ipv6.h>
76 #include <net/protocol.h>
77 #include <net/ndisc.h>
78 #include <net/ip6_route.h>
79 #include <net/addrconf.h>
80 #include <net/tcp.h>
81 #include <net/ip.h>
82 #include <net/netlink.h>
83 #include <net/pkt_sched.h>
84 #include <linux/if_tunnel.h>
85 #include <linux/rtnetlink.h>
86 #include <linux/netconf.h>
87 #include <linux/random.h>
88 #include <linux/uaccess.h>
89 #include <asm/unaligned.h>
90
91 #include <linux/proc_fs.h>
92 #include <linux/seq_file.h>
93 #include <linux/export.h>
94
95 /* Set to 3 to get tracing... */
96 #define ACONF_DEBUG 2
97
98 #if ACONF_DEBUG >= 3
99 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
100 #else
101 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
102 #endif
103
104 #define INFINITY_LIFE_TIME 0xFFFFFFFF
105
106 #define IPV6_MAX_STRLEN \
107 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
108
109 static inline u32 cstamp_delta(unsigned long cstamp)
110 {
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112 }
113
114 #ifdef CONFIG_SYSCTL
115 static int addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117 #else
118 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
119 {
120 return 0;
121 }
122
123 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
124 {
125 }
126 #endif
127
128 static void __ipv6_regen_rndid(struct inet6_dev *idev);
129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
130 static void ipv6_regen_rndid(unsigned long data);
131
132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
133 static int ipv6_count_addresses(struct inet6_dev *idev);
134 static int ipv6_generate_stable_address(struct in6_addr *addr,
135 u8 dad_count,
136 const struct inet6_dev *idev);
137
138 /*
139 * Configured unicast address hash table
140 */
141 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
142 static DEFINE_SPINLOCK(addrconf_hash_lock);
143
144 static void addrconf_verify(void);
145 static void addrconf_verify_rtnl(void);
146 static void addrconf_verify_work(struct work_struct *);
147
148 static struct workqueue_struct *addrconf_wq;
149 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
150
151 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
152 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
153
154 static void addrconf_type_change(struct net_device *dev,
155 unsigned long event);
156 static int addrconf_ifdown(struct net_device *dev, int how);
157
158 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
159 int plen,
160 const struct net_device *dev,
161 u32 flags, u32 noflags);
162
163 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
164 static void addrconf_dad_work(struct work_struct *w);
165 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
166 static void addrconf_dad_run(struct inet6_dev *idev);
167 static void addrconf_rs_timer(unsigned long data);
168 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170
171 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
172 struct prefix_info *pinfo);
173 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
174 struct net_device *dev);
175
176 static struct ipv6_devconf ipv6_devconf __read_mostly = {
177 .forwarding = 0,
178 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
179 .mtu6 = IPV6_MIN_MTU,
180 .accept_ra = 1,
181 .accept_redirects = 1,
182 .autoconf = 1,
183 .force_mld_version = 0,
184 .mldv1_unsolicited_report_interval = 10 * HZ,
185 .mldv2_unsolicited_report_interval = HZ,
186 .dad_transmits = 1,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
190 .use_tempaddr = 0,
191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
195 .max_addresses = IPV6_MAX_ADDRESSES,
196 .accept_ra_defrtr = 1,
197 .accept_ra_from_local = 0,
198 .accept_ra_min_hop_limit= 1,
199 .accept_ra_pinfo = 1,
200 #ifdef CONFIG_IPV6_ROUTER_PREF
201 .accept_ra_rtr_pref = 1,
202 .rtr_probe_interval = 60 * HZ,
203 #ifdef CONFIG_IPV6_ROUTE_INFO
204 .accept_ra_rt_info_max_plen = 0,
205 #endif
206 #endif
207 .proxy_ndp = 0,
208 .accept_source_route = 0, /* we do not accept RH0 by default. */
209 .disable_ipv6 = 0,
210 .accept_dad = 1,
211 .suppress_frag_ndisc = 1,
212 .accept_ra_mtu = 1,
213 .stable_secret = {
214 .initialized = false,
215 },
216 .use_oif_addrs_only = 0,
217 };
218
219 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
220 .forwarding = 0,
221 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
222 .mtu6 = IPV6_MIN_MTU,
223 .accept_ra = 1,
224 .accept_redirects = 1,
225 .autoconf = 1,
226 .force_mld_version = 0,
227 .mldv1_unsolicited_report_interval = 10 * HZ,
228 .mldv2_unsolicited_report_interval = HZ,
229 .dad_transmits = 1,
230 .rtr_solicits = MAX_RTR_SOLICITATIONS,
231 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
232 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
233 .use_tempaddr = 0,
234 .temp_valid_lft = TEMP_VALID_LIFETIME,
235 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
236 .regen_max_retry = REGEN_MAX_RETRY,
237 .max_desync_factor = MAX_DESYNC_FACTOR,
238 .max_addresses = IPV6_MAX_ADDRESSES,
239 .accept_ra_defrtr = 1,
240 .accept_ra_from_local = 0,
241 .accept_ra_min_hop_limit= 1,
242 .accept_ra_pinfo = 1,
243 #ifdef CONFIG_IPV6_ROUTER_PREF
244 .accept_ra_rtr_pref = 1,
245 .rtr_probe_interval = 60 * HZ,
246 #ifdef CONFIG_IPV6_ROUTE_INFO
247 .accept_ra_rt_info_max_plen = 0,
248 #endif
249 #endif
250 .proxy_ndp = 0,
251 .accept_source_route = 0, /* we do not accept RH0 by default. */
252 .disable_ipv6 = 0,
253 .accept_dad = 1,
254 .suppress_frag_ndisc = 1,
255 .accept_ra_mtu = 1,
256 .stable_secret = {
257 .initialized = false,
258 },
259 .use_oif_addrs_only = 0,
260 };
261
262 /* Check if a valid qdisc is available */
263 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
264 {
265 return !qdisc_tx_is_noop(dev);
266 }
267
268 static void addrconf_del_rs_timer(struct inet6_dev *idev)
269 {
270 if (del_timer(&idev->rs_timer))
271 __in6_dev_put(idev);
272 }
273
274 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
275 {
276 if (cancel_delayed_work(&ifp->dad_work))
277 __in6_ifa_put(ifp);
278 }
279
280 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
281 unsigned long when)
282 {
283 if (!timer_pending(&idev->rs_timer))
284 in6_dev_hold(idev);
285 mod_timer(&idev->rs_timer, jiffies + when);
286 }
287
288 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
289 unsigned long delay)
290 {
291 if (!delayed_work_pending(&ifp->dad_work))
292 in6_ifa_hold(ifp);
293 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
294 }
295
296 static int snmp6_alloc_dev(struct inet6_dev *idev)
297 {
298 int i;
299
300 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
301 if (!idev->stats.ipv6)
302 goto err_ip;
303
304 for_each_possible_cpu(i) {
305 struct ipstats_mib *addrconf_stats;
306 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
307 u64_stats_init(&addrconf_stats->syncp);
308 }
309
310
311 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
312 GFP_KERNEL);
313 if (!idev->stats.icmpv6dev)
314 goto err_icmp;
315 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
316 GFP_KERNEL);
317 if (!idev->stats.icmpv6msgdev)
318 goto err_icmpmsg;
319
320 return 0;
321
322 err_icmpmsg:
323 kfree(idev->stats.icmpv6dev);
324 err_icmp:
325 free_percpu(idev->stats.ipv6);
326 err_ip:
327 return -ENOMEM;
328 }
329
330 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
331 {
332 struct inet6_dev *ndev;
333 int err = -ENOMEM;
334
335 ASSERT_RTNL();
336
337 if (dev->mtu < IPV6_MIN_MTU)
338 return ERR_PTR(-EINVAL);
339
340 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
341 if (!ndev)
342 return ERR_PTR(err);
343
344 rwlock_init(&ndev->lock);
345 ndev->dev = dev;
346 INIT_LIST_HEAD(&ndev->addr_list);
347 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
348 (unsigned long)ndev);
349 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
350 ndev->cnf.mtu6 = dev->mtu;
351 ndev->cnf.sysctl = NULL;
352 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
353 if (!ndev->nd_parms) {
354 kfree(ndev);
355 return ERR_PTR(err);
356 }
357 if (ndev->cnf.forwarding)
358 dev_disable_lro(dev);
359 /* We refer to the device */
360 dev_hold(dev);
361
362 if (snmp6_alloc_dev(ndev) < 0) {
363 ADBG(KERN_WARNING
364 "%s: cannot allocate memory for statistics; dev=%s.\n",
365 __func__, dev->name);
366 neigh_parms_release(&nd_tbl, ndev->nd_parms);
367 dev_put(dev);
368 kfree(ndev);
369 return ERR_PTR(err);
370 }
371
372 if (snmp6_register_dev(ndev) < 0) {
373 ADBG(KERN_WARNING
374 "%s: cannot create /proc/net/dev_snmp6/%s\n",
375 __func__, dev->name);
376 goto err_release;
377 }
378
379 /* One reference from device. We must do this before
380 * we invoke __ipv6_regen_rndid().
381 */
382 in6_dev_hold(ndev);
383
384 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
385 ndev->cnf.accept_dad = -1;
386
387 #if IS_ENABLED(CONFIG_IPV6_SIT)
388 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
389 pr_info("%s: Disabled Multicast RS\n", dev->name);
390 ndev->cnf.rtr_solicits = 0;
391 }
392 #endif
393
394 INIT_LIST_HEAD(&ndev->tempaddr_list);
395 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
396 if ((dev->flags&IFF_LOOPBACK) ||
397 dev->type == ARPHRD_TUNNEL ||
398 dev->type == ARPHRD_TUNNEL6 ||
399 dev->type == ARPHRD_SIT ||
400 dev->type == ARPHRD_NONE) {
401 ndev->cnf.use_tempaddr = -1;
402 } else {
403 in6_dev_hold(ndev);
404 ipv6_regen_rndid((unsigned long) ndev);
405 }
406
407 ndev->token = in6addr_any;
408
409 if (netif_running(dev) && addrconf_qdisc_ok(dev))
410 ndev->if_flags |= IF_READY;
411
412 ipv6_mc_init_dev(ndev);
413 ndev->tstamp = jiffies;
414 err = addrconf_sysctl_register(ndev);
415 if (err) {
416 ipv6_mc_destroy_dev(ndev);
417 del_timer(&ndev->regen_timer);
418 goto err_release;
419 }
420 /* protected by rtnl_lock */
421 rcu_assign_pointer(dev->ip6_ptr, ndev);
422
423 /* Join interface-local all-node multicast group */
424 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
425
426 /* Join all-node multicast group */
427 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
428
429 /* Join all-router multicast group if forwarding is set */
430 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
431 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
432
433 return ndev;
434
435 err_release:
436 neigh_parms_release(&nd_tbl, ndev->nd_parms);
437 ndev->dead = 1;
438 in6_dev_finish_destroy(ndev);
439 return ERR_PTR(err);
440 }
441
442 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
443 {
444 struct inet6_dev *idev;
445
446 ASSERT_RTNL();
447
448 idev = __in6_dev_get(dev);
449 if (!idev) {
450 idev = ipv6_add_dev(dev);
451 if (IS_ERR(idev))
452 return NULL;
453 }
454
455 if (dev->flags&IFF_UP)
456 ipv6_mc_up(idev);
457 return idev;
458 }
459
460 static int inet6_netconf_msgsize_devconf(int type)
461 {
462 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
463 + nla_total_size(4); /* NETCONFA_IFINDEX */
464
465 /* type -1 is used for ALL */
466 if (type == -1 || type == NETCONFA_FORWARDING)
467 size += nla_total_size(4);
468 #ifdef CONFIG_IPV6_MROUTE
469 if (type == -1 || type == NETCONFA_MC_FORWARDING)
470 size += nla_total_size(4);
471 #endif
472 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
473 size += nla_total_size(4);
474
475 return size;
476 }
477
478 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
479 struct ipv6_devconf *devconf, u32 portid,
480 u32 seq, int event, unsigned int flags,
481 int type)
482 {
483 struct nlmsghdr *nlh;
484 struct netconfmsg *ncm;
485
486 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
487 flags);
488 if (!nlh)
489 return -EMSGSIZE;
490
491 ncm = nlmsg_data(nlh);
492 ncm->ncm_family = AF_INET6;
493
494 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
495 goto nla_put_failure;
496
497 /* type -1 is used for ALL */
498 if ((type == -1 || type == NETCONFA_FORWARDING) &&
499 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
500 goto nla_put_failure;
501 #ifdef CONFIG_IPV6_MROUTE
502 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
503 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
504 devconf->mc_forwarding) < 0)
505 goto nla_put_failure;
506 #endif
507 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
508 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
509 goto nla_put_failure;
510
511 nlmsg_end(skb, nlh);
512 return 0;
513
514 nla_put_failure:
515 nlmsg_cancel(skb, nlh);
516 return -EMSGSIZE;
517 }
518
519 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
520 struct ipv6_devconf *devconf)
521 {
522 struct sk_buff *skb;
523 int err = -ENOBUFS;
524
525 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
526 if (!skb)
527 goto errout;
528
529 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
530 RTM_NEWNETCONF, 0, type);
531 if (err < 0) {
532 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
533 WARN_ON(err == -EMSGSIZE);
534 kfree_skb(skb);
535 goto errout;
536 }
537 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
538 return;
539 errout:
540 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
541 }
542
543 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
544 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
545 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
546 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
547 };
548
549 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
550 struct nlmsghdr *nlh)
551 {
552 struct net *net = sock_net(in_skb->sk);
553 struct nlattr *tb[NETCONFA_MAX+1];
554 struct netconfmsg *ncm;
555 struct sk_buff *skb;
556 struct ipv6_devconf *devconf;
557 struct inet6_dev *in6_dev;
558 struct net_device *dev;
559 int ifindex;
560 int err;
561
562 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
563 devconf_ipv6_policy);
564 if (err < 0)
565 goto errout;
566
567 err = EINVAL;
568 if (!tb[NETCONFA_IFINDEX])
569 goto errout;
570
571 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
572 switch (ifindex) {
573 case NETCONFA_IFINDEX_ALL:
574 devconf = net->ipv6.devconf_all;
575 break;
576 case NETCONFA_IFINDEX_DEFAULT:
577 devconf = net->ipv6.devconf_dflt;
578 break;
579 default:
580 dev = __dev_get_by_index(net, ifindex);
581 if (!dev)
582 goto errout;
583 in6_dev = __in6_dev_get(dev);
584 if (!in6_dev)
585 goto errout;
586 devconf = &in6_dev->cnf;
587 break;
588 }
589
590 err = -ENOBUFS;
591 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
592 if (!skb)
593 goto errout;
594
595 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
596 NETLINK_CB(in_skb).portid,
597 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
598 -1);
599 if (err < 0) {
600 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
601 WARN_ON(err == -EMSGSIZE);
602 kfree_skb(skb);
603 goto errout;
604 }
605 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
606 errout:
607 return err;
608 }
609
610 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
611 struct netlink_callback *cb)
612 {
613 struct net *net = sock_net(skb->sk);
614 int h, s_h;
615 int idx, s_idx;
616 struct net_device *dev;
617 struct inet6_dev *idev;
618 struct hlist_head *head;
619
620 s_h = cb->args[0];
621 s_idx = idx = cb->args[1];
622
623 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
624 idx = 0;
625 head = &net->dev_index_head[h];
626 rcu_read_lock();
627 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
628 net->dev_base_seq;
629 hlist_for_each_entry_rcu(dev, head, index_hlist) {
630 if (idx < s_idx)
631 goto cont;
632 idev = __in6_dev_get(dev);
633 if (!idev)
634 goto cont;
635
636 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
637 &idev->cnf,
638 NETLINK_CB(cb->skb).portid,
639 cb->nlh->nlmsg_seq,
640 RTM_NEWNETCONF,
641 NLM_F_MULTI,
642 -1) < 0) {
643 rcu_read_unlock();
644 goto done;
645 }
646 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
647 cont:
648 idx++;
649 }
650 rcu_read_unlock();
651 }
652 if (h == NETDEV_HASHENTRIES) {
653 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
654 net->ipv6.devconf_all,
655 NETLINK_CB(cb->skb).portid,
656 cb->nlh->nlmsg_seq,
657 RTM_NEWNETCONF, NLM_F_MULTI,
658 -1) < 0)
659 goto done;
660 else
661 h++;
662 }
663 if (h == NETDEV_HASHENTRIES + 1) {
664 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
665 net->ipv6.devconf_dflt,
666 NETLINK_CB(cb->skb).portid,
667 cb->nlh->nlmsg_seq,
668 RTM_NEWNETCONF, NLM_F_MULTI,
669 -1) < 0)
670 goto done;
671 else
672 h++;
673 }
674 done:
675 cb->args[0] = h;
676 cb->args[1] = idx;
677
678 return skb->len;
679 }
680
681 #ifdef CONFIG_SYSCTL
682 static void dev_forward_change(struct inet6_dev *idev)
683 {
684 struct net_device *dev;
685 struct inet6_ifaddr *ifa;
686
687 if (!idev)
688 return;
689 dev = idev->dev;
690 if (idev->cnf.forwarding)
691 dev_disable_lro(dev);
692 if (dev->flags & IFF_MULTICAST) {
693 if (idev->cnf.forwarding) {
694 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
695 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
696 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
697 } else {
698 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
699 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
700 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
701 }
702 }
703
704 list_for_each_entry(ifa, &idev->addr_list, if_list) {
705 if (ifa->flags&IFA_F_TENTATIVE)
706 continue;
707 if (idev->cnf.forwarding)
708 addrconf_join_anycast(ifa);
709 else
710 addrconf_leave_anycast(ifa);
711 }
712 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
713 dev->ifindex, &idev->cnf);
714 }
715
716
717 static void addrconf_forward_change(struct net *net, __s32 newf)
718 {
719 struct net_device *dev;
720 struct inet6_dev *idev;
721
722 for_each_netdev(net, dev) {
723 idev = __in6_dev_get(dev);
724 if (idev) {
725 int changed = (!idev->cnf.forwarding) ^ (!newf);
726 idev->cnf.forwarding = newf;
727 if (changed)
728 dev_forward_change(idev);
729 }
730 }
731 }
732
733 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
734 {
735 struct net *net;
736 int old;
737
738 if (!rtnl_trylock())
739 return restart_syscall();
740
741 net = (struct net *)table->extra2;
742 old = *p;
743 *p = newf;
744
745 if (p == &net->ipv6.devconf_dflt->forwarding) {
746 if ((!newf) ^ (!old))
747 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
748 NETCONFA_IFINDEX_DEFAULT,
749 net->ipv6.devconf_dflt);
750 rtnl_unlock();
751 return 0;
752 }
753
754 if (p == &net->ipv6.devconf_all->forwarding) {
755 net->ipv6.devconf_dflt->forwarding = newf;
756 addrconf_forward_change(net, newf);
757 if ((!newf) ^ (!old))
758 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
759 NETCONFA_IFINDEX_ALL,
760 net->ipv6.devconf_all);
761 } else if ((!newf) ^ (!old))
762 dev_forward_change((struct inet6_dev *)table->extra1);
763 rtnl_unlock();
764
765 if (newf)
766 rt6_purge_dflt_routers(net);
767 return 1;
768 }
769 #endif
770
771 /* Nobody refers to this ifaddr, destroy it */
772 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
773 {
774 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
775
776 #ifdef NET_REFCNT_DEBUG
777 pr_debug("%s\n", __func__);
778 #endif
779
780 in6_dev_put(ifp->idev);
781
782 if (cancel_delayed_work(&ifp->dad_work))
783 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
784 ifp);
785
786 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
787 pr_warn("Freeing alive inet6 address %p\n", ifp);
788 return;
789 }
790 ip6_rt_put(ifp->rt);
791
792 kfree_rcu(ifp, rcu);
793 }
794
795 static void
796 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
797 {
798 struct list_head *p;
799 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
800
801 /*
802 * Each device address list is sorted in order of scope -
803 * global before linklocal.
804 */
805 list_for_each(p, &idev->addr_list) {
806 struct inet6_ifaddr *ifa
807 = list_entry(p, struct inet6_ifaddr, if_list);
808 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
809 break;
810 }
811
812 list_add_tail(&ifp->if_list, p);
813 }
814
815 static u32 inet6_addr_hash(const struct in6_addr *addr)
816 {
817 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
818 }
819
820 /* On success it returns ifp with increased reference count */
821
822 static struct inet6_ifaddr *
823 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
824 const struct in6_addr *peer_addr, int pfxlen,
825 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
826 {
827 struct inet6_ifaddr *ifa = NULL;
828 struct rt6_info *rt;
829 unsigned int hash;
830 int err = 0;
831 int addr_type = ipv6_addr_type(addr);
832
833 if (addr_type == IPV6_ADDR_ANY ||
834 addr_type & IPV6_ADDR_MULTICAST ||
835 (!(idev->dev->flags & IFF_LOOPBACK) &&
836 addr_type & IPV6_ADDR_LOOPBACK))
837 return ERR_PTR(-EADDRNOTAVAIL);
838
839 rcu_read_lock_bh();
840 if (idev->dead) {
841 err = -ENODEV; /*XXX*/
842 goto out2;
843 }
844
845 if (idev->cnf.disable_ipv6) {
846 err = -EACCES;
847 goto out2;
848 }
849
850 spin_lock(&addrconf_hash_lock);
851
852 /* Ignore adding duplicate addresses on an interface */
853 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
854 ADBG("ipv6_add_addr: already assigned\n");
855 err = -EEXIST;
856 goto out;
857 }
858
859 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
860
861 if (!ifa) {
862 ADBG("ipv6_add_addr: malloc failed\n");
863 err = -ENOBUFS;
864 goto out;
865 }
866
867 rt = addrconf_dst_alloc(idev, addr, false);
868 if (IS_ERR(rt)) {
869 err = PTR_ERR(rt);
870 goto out;
871 }
872
873 neigh_parms_data_state_setall(idev->nd_parms);
874
875 ifa->addr = *addr;
876 if (peer_addr)
877 ifa->peer_addr = *peer_addr;
878
879 spin_lock_init(&ifa->lock);
880 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
881 INIT_HLIST_NODE(&ifa->addr_lst);
882 ifa->scope = scope;
883 ifa->prefix_len = pfxlen;
884 ifa->flags = flags | IFA_F_TENTATIVE;
885 ifa->valid_lft = valid_lft;
886 ifa->prefered_lft = prefered_lft;
887 ifa->cstamp = ifa->tstamp = jiffies;
888 ifa->tokenized = false;
889
890 ifa->rt = rt;
891
892 ifa->idev = idev;
893 in6_dev_hold(idev);
894 /* For caller */
895 in6_ifa_hold(ifa);
896
897 /* Add to big hash table */
898 hash = inet6_addr_hash(addr);
899
900 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
901 spin_unlock(&addrconf_hash_lock);
902
903 write_lock(&idev->lock);
904 /* Add to inet6_dev unicast addr list. */
905 ipv6_link_dev_addr(idev, ifa);
906
907 if (ifa->flags&IFA_F_TEMPORARY) {
908 list_add(&ifa->tmp_list, &idev->tempaddr_list);
909 in6_ifa_hold(ifa);
910 }
911
912 in6_ifa_hold(ifa);
913 write_unlock(&idev->lock);
914 out2:
915 rcu_read_unlock_bh();
916
917 if (likely(err == 0))
918 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
919 else {
920 kfree(ifa);
921 ifa = ERR_PTR(err);
922 }
923
924 return ifa;
925 out:
926 spin_unlock(&addrconf_hash_lock);
927 goto out2;
928 }
929
930 enum cleanup_prefix_rt_t {
931 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
932 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
933 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
934 };
935
936 /*
937 * Check, whether the prefix for ifp would still need a prefix route
938 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
939 * constants.
940 *
941 * 1) we don't purge prefix if address was not permanent.
942 * prefix is managed by its own lifetime.
943 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
944 * 3) if there are no addresses, delete prefix.
945 * 4) if there are still other permanent address(es),
946 * corresponding prefix is still permanent.
947 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
948 * don't purge the prefix, assume user space is managing it.
949 * 6) otherwise, update prefix lifetime to the
950 * longest valid lifetime among the corresponding
951 * addresses on the device.
952 * Note: subsequent RA will update lifetime.
953 **/
954 static enum cleanup_prefix_rt_t
955 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
956 {
957 struct inet6_ifaddr *ifa;
958 struct inet6_dev *idev = ifp->idev;
959 unsigned long lifetime;
960 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
961
962 *expires = jiffies;
963
964 list_for_each_entry(ifa, &idev->addr_list, if_list) {
965 if (ifa == ifp)
966 continue;
967 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
968 ifp->prefix_len))
969 continue;
970 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
971 return CLEANUP_PREFIX_RT_NOP;
972
973 action = CLEANUP_PREFIX_RT_EXPIRE;
974
975 spin_lock(&ifa->lock);
976
977 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
978 /*
979 * Note: Because this address is
980 * not permanent, lifetime <
981 * LONG_MAX / HZ here.
982 */
983 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
984 *expires = ifa->tstamp + lifetime * HZ;
985 spin_unlock(&ifa->lock);
986 }
987
988 return action;
989 }
990
991 static void
992 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
993 {
994 struct rt6_info *rt;
995
996 rt = addrconf_get_prefix_route(&ifp->addr,
997 ifp->prefix_len,
998 ifp->idev->dev,
999 0, RTF_GATEWAY | RTF_DEFAULT);
1000 if (rt) {
1001 if (del_rt)
1002 ip6_del_rt(rt);
1003 else {
1004 if (!(rt->rt6i_flags & RTF_EXPIRES))
1005 rt6_set_expires(rt, expires);
1006 ip6_rt_put(rt);
1007 }
1008 }
1009 }
1010
1011
1012 /* This function wants to get referenced ifp and releases it before return */
1013
1014 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1015 {
1016 int state;
1017 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1018 unsigned long expires;
1019
1020 ASSERT_RTNL();
1021
1022 spin_lock_bh(&ifp->lock);
1023 state = ifp->state;
1024 ifp->state = INET6_IFADDR_STATE_DEAD;
1025 spin_unlock_bh(&ifp->lock);
1026
1027 if (state == INET6_IFADDR_STATE_DEAD)
1028 goto out;
1029
1030 spin_lock_bh(&addrconf_hash_lock);
1031 hlist_del_init_rcu(&ifp->addr_lst);
1032 spin_unlock_bh(&addrconf_hash_lock);
1033
1034 write_lock_bh(&ifp->idev->lock);
1035
1036 if (ifp->flags&IFA_F_TEMPORARY) {
1037 list_del(&ifp->tmp_list);
1038 if (ifp->ifpub) {
1039 in6_ifa_put(ifp->ifpub);
1040 ifp->ifpub = NULL;
1041 }
1042 __in6_ifa_put(ifp);
1043 }
1044
1045 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1046 action = check_cleanup_prefix_route(ifp, &expires);
1047
1048 list_del_init(&ifp->if_list);
1049 __in6_ifa_put(ifp);
1050
1051 write_unlock_bh(&ifp->idev->lock);
1052
1053 addrconf_del_dad_work(ifp);
1054
1055 ipv6_ifa_notify(RTM_DELADDR, ifp);
1056
1057 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1058
1059 if (action != CLEANUP_PREFIX_RT_NOP) {
1060 cleanup_prefix_route(ifp, expires,
1061 action == CLEANUP_PREFIX_RT_DEL);
1062 }
1063
1064 /* clean up prefsrc entries */
1065 rt6_remove_prefsrc(ifp);
1066 out:
1067 in6_ifa_put(ifp);
1068 }
1069
1070 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1071 {
1072 struct inet6_dev *idev = ifp->idev;
1073 struct in6_addr addr, *tmpaddr;
1074 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1075 unsigned long regen_advance;
1076 int tmp_plen;
1077 int ret = 0;
1078 u32 addr_flags;
1079 unsigned long now = jiffies;
1080
1081 write_lock_bh(&idev->lock);
1082 if (ift) {
1083 spin_lock_bh(&ift->lock);
1084 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1085 spin_unlock_bh(&ift->lock);
1086 tmpaddr = &addr;
1087 } else {
1088 tmpaddr = NULL;
1089 }
1090 retry:
1091 in6_dev_hold(idev);
1092 if (idev->cnf.use_tempaddr <= 0) {
1093 write_unlock_bh(&idev->lock);
1094 pr_info("%s: use_tempaddr is disabled\n", __func__);
1095 in6_dev_put(idev);
1096 ret = -1;
1097 goto out;
1098 }
1099 spin_lock_bh(&ifp->lock);
1100 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1101 idev->cnf.use_tempaddr = -1; /*XXX*/
1102 spin_unlock_bh(&ifp->lock);
1103 write_unlock_bh(&idev->lock);
1104 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1105 __func__);
1106 in6_dev_put(idev);
1107 ret = -1;
1108 goto out;
1109 }
1110 in6_ifa_hold(ifp);
1111 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1112 __ipv6_try_regen_rndid(idev, tmpaddr);
1113 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1114 age = (now - ifp->tstamp) / HZ;
1115 tmp_valid_lft = min_t(__u32,
1116 ifp->valid_lft,
1117 idev->cnf.temp_valid_lft + age);
1118 tmp_prefered_lft = min_t(__u32,
1119 ifp->prefered_lft,
1120 idev->cnf.temp_prefered_lft + age -
1121 idev->cnf.max_desync_factor);
1122 tmp_plen = ifp->prefix_len;
1123 tmp_tstamp = ifp->tstamp;
1124 spin_unlock_bh(&ifp->lock);
1125
1126 regen_advance = idev->cnf.regen_max_retry *
1127 idev->cnf.dad_transmits *
1128 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1129 write_unlock_bh(&idev->lock);
1130
1131 /* A temporary address is created only if this calculated Preferred
1132 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1133 * an implementation must not create a temporary address with a zero
1134 * Preferred Lifetime.
1135 * Use age calculation as in addrconf_verify to avoid unnecessary
1136 * temporary addresses being generated.
1137 */
1138 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1139 if (tmp_prefered_lft <= regen_advance + age) {
1140 in6_ifa_put(ifp);
1141 in6_dev_put(idev);
1142 ret = -1;
1143 goto out;
1144 }
1145
1146 addr_flags = IFA_F_TEMPORARY;
1147 /* set in addrconf_prefix_rcv() */
1148 if (ifp->flags & IFA_F_OPTIMISTIC)
1149 addr_flags |= IFA_F_OPTIMISTIC;
1150
1151 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1152 ipv6_addr_scope(&addr), addr_flags,
1153 tmp_valid_lft, tmp_prefered_lft);
1154 if (IS_ERR(ift)) {
1155 in6_ifa_put(ifp);
1156 in6_dev_put(idev);
1157 pr_info("%s: retry temporary address regeneration\n", __func__);
1158 tmpaddr = &addr;
1159 write_lock_bh(&idev->lock);
1160 goto retry;
1161 }
1162
1163 spin_lock_bh(&ift->lock);
1164 ift->ifpub = ifp;
1165 ift->cstamp = now;
1166 ift->tstamp = tmp_tstamp;
1167 spin_unlock_bh(&ift->lock);
1168
1169 addrconf_dad_start(ift);
1170 in6_ifa_put(ift);
1171 in6_dev_put(idev);
1172 out:
1173 return ret;
1174 }
1175
1176 /*
1177 * Choose an appropriate source address (RFC3484)
1178 */
1179 enum {
1180 IPV6_SADDR_RULE_INIT = 0,
1181 IPV6_SADDR_RULE_LOCAL,
1182 IPV6_SADDR_RULE_SCOPE,
1183 IPV6_SADDR_RULE_PREFERRED,
1184 #ifdef CONFIG_IPV6_MIP6
1185 IPV6_SADDR_RULE_HOA,
1186 #endif
1187 IPV6_SADDR_RULE_OIF,
1188 IPV6_SADDR_RULE_LABEL,
1189 IPV6_SADDR_RULE_PRIVACY,
1190 IPV6_SADDR_RULE_ORCHID,
1191 IPV6_SADDR_RULE_PREFIX,
1192 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1193 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1194 #endif
1195 IPV6_SADDR_RULE_MAX
1196 };
1197
1198 struct ipv6_saddr_score {
1199 int rule;
1200 int addr_type;
1201 struct inet6_ifaddr *ifa;
1202 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1203 int scopedist;
1204 int matchlen;
1205 };
1206
1207 struct ipv6_saddr_dst {
1208 const struct in6_addr *addr;
1209 int ifindex;
1210 int scope;
1211 int label;
1212 unsigned int prefs;
1213 };
1214
1215 static inline int ipv6_saddr_preferred(int type)
1216 {
1217 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1218 return 1;
1219 return 0;
1220 }
1221
1222 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1223 {
1224 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1225 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1226 #else
1227 return false;
1228 #endif
1229 }
1230
1231 static int ipv6_get_saddr_eval(struct net *net,
1232 struct ipv6_saddr_score *score,
1233 struct ipv6_saddr_dst *dst,
1234 int i)
1235 {
1236 int ret;
1237
1238 if (i <= score->rule) {
1239 switch (i) {
1240 case IPV6_SADDR_RULE_SCOPE:
1241 ret = score->scopedist;
1242 break;
1243 case IPV6_SADDR_RULE_PREFIX:
1244 ret = score->matchlen;
1245 break;
1246 default:
1247 ret = !!test_bit(i, score->scorebits);
1248 }
1249 goto out;
1250 }
1251
1252 switch (i) {
1253 case IPV6_SADDR_RULE_INIT:
1254 /* Rule 0: remember if hiscore is not ready yet */
1255 ret = !!score->ifa;
1256 break;
1257 case IPV6_SADDR_RULE_LOCAL:
1258 /* Rule 1: Prefer same address */
1259 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1260 break;
1261 case IPV6_SADDR_RULE_SCOPE:
1262 /* Rule 2: Prefer appropriate scope
1263 *
1264 * ret
1265 * ^
1266 * -1 | d 15
1267 * ---+--+-+---> scope
1268 * |
1269 * | d is scope of the destination.
1270 * B-d | \
1271 * | \ <- smaller scope is better if
1272 * B-15 | \ if scope is enough for destination.
1273 * | ret = B - scope (-1 <= scope >= d <= 15).
1274 * d-C-1 | /
1275 * |/ <- greater is better
1276 * -C / if scope is not enough for destination.
1277 * /| ret = scope - C (-1 <= d < scope <= 15).
1278 *
1279 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1280 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1281 * Assume B = 0 and we get C > 29.
1282 */
1283 ret = __ipv6_addr_src_scope(score->addr_type);
1284 if (ret >= dst->scope)
1285 ret = -ret;
1286 else
1287 ret -= 128; /* 30 is enough */
1288 score->scopedist = ret;
1289 break;
1290 case IPV6_SADDR_RULE_PREFERRED:
1291 {
1292 /* Rule 3: Avoid deprecated and optimistic addresses */
1293 u8 avoid = IFA_F_DEPRECATED;
1294
1295 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1296 avoid |= IFA_F_OPTIMISTIC;
1297 ret = ipv6_saddr_preferred(score->addr_type) ||
1298 !(score->ifa->flags & avoid);
1299 break;
1300 }
1301 #ifdef CONFIG_IPV6_MIP6
1302 case IPV6_SADDR_RULE_HOA:
1303 {
1304 /* Rule 4: Prefer home address */
1305 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1306 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1307 break;
1308 }
1309 #endif
1310 case IPV6_SADDR_RULE_OIF:
1311 /* Rule 5: Prefer outgoing interface */
1312 ret = (!dst->ifindex ||
1313 dst->ifindex == score->ifa->idev->dev->ifindex);
1314 break;
1315 case IPV6_SADDR_RULE_LABEL:
1316 /* Rule 6: Prefer matching label */
1317 ret = ipv6_addr_label(net,
1318 &score->ifa->addr, score->addr_type,
1319 score->ifa->idev->dev->ifindex) == dst->label;
1320 break;
1321 case IPV6_SADDR_RULE_PRIVACY:
1322 {
1323 /* Rule 7: Prefer public address
1324 * Note: prefer temporary address if use_tempaddr >= 2
1325 */
1326 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1327 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1328 score->ifa->idev->cnf.use_tempaddr >= 2;
1329 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1330 break;
1331 }
1332 case IPV6_SADDR_RULE_ORCHID:
1333 /* Rule 8-: Prefer ORCHID vs ORCHID or
1334 * non-ORCHID vs non-ORCHID
1335 */
1336 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1337 ipv6_addr_orchid(dst->addr));
1338 break;
1339 case IPV6_SADDR_RULE_PREFIX:
1340 /* Rule 8: Use longest matching prefix */
1341 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1342 if (ret > score->ifa->prefix_len)
1343 ret = score->ifa->prefix_len;
1344 score->matchlen = ret;
1345 break;
1346 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1347 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1348 /* Optimistic addresses still have lower precedence than other
1349 * preferred addresses.
1350 */
1351 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1352 break;
1353 #endif
1354 default:
1355 ret = 0;
1356 }
1357
1358 if (ret)
1359 __set_bit(i, score->scorebits);
1360 score->rule = i;
1361 out:
1362 return ret;
1363 }
1364
1365 static int __ipv6_dev_get_saddr(struct net *net,
1366 struct ipv6_saddr_dst *dst,
1367 struct inet6_dev *idev,
1368 struct ipv6_saddr_score *scores,
1369 int hiscore_idx)
1370 {
1371 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1372
1373 read_lock_bh(&idev->lock);
1374 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1375 int i;
1376
1377 /*
1378 * - Tentative Address (RFC2462 section 5.4)
1379 * - A tentative address is not considered
1380 * "assigned to an interface" in the traditional
1381 * sense, unless it is also flagged as optimistic.
1382 * - Candidate Source Address (section 4)
1383 * - In any case, anycast addresses, multicast
1384 * addresses, and the unspecified address MUST
1385 * NOT be included in a candidate set.
1386 */
1387 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1388 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1389 continue;
1390
1391 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1392
1393 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1394 score->addr_type & IPV6_ADDR_MULTICAST)) {
1395 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1396 idev->dev->name);
1397 continue;
1398 }
1399
1400 score->rule = -1;
1401 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1402
1403 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1404 int minihiscore, miniscore;
1405
1406 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1407 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1408
1409 if (minihiscore > miniscore) {
1410 if (i == IPV6_SADDR_RULE_SCOPE &&
1411 score->scopedist > 0) {
1412 /*
1413 * special case:
1414 * each remaining entry
1415 * has too small (not enough)
1416 * scope, because ifa entries
1417 * are sorted by their scope
1418 * values.
1419 */
1420 goto out;
1421 }
1422 break;
1423 } else if (minihiscore < miniscore) {
1424 if (hiscore->ifa)
1425 in6_ifa_put(hiscore->ifa);
1426
1427 in6_ifa_hold(score->ifa);
1428
1429 swap(hiscore, score);
1430 hiscore_idx = 1 - hiscore_idx;
1431
1432 /* restore our iterator */
1433 score->ifa = hiscore->ifa;
1434
1435 break;
1436 }
1437 }
1438 }
1439 out:
1440 read_unlock_bh(&idev->lock);
1441 return hiscore_idx;
1442 }
1443
1444 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1445 const struct in6_addr *daddr, unsigned int prefs,
1446 struct in6_addr *saddr)
1447 {
1448 struct ipv6_saddr_score scores[2], *hiscore;
1449 struct ipv6_saddr_dst dst;
1450 struct inet6_dev *idev;
1451 struct net_device *dev;
1452 int dst_type;
1453 bool use_oif_addr = false;
1454 int hiscore_idx = 0;
1455
1456 dst_type = __ipv6_addr_type(daddr);
1457 dst.addr = daddr;
1458 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1459 dst.scope = __ipv6_addr_src_scope(dst_type);
1460 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1461 dst.prefs = prefs;
1462
1463 scores[hiscore_idx].rule = -1;
1464 scores[hiscore_idx].ifa = NULL;
1465
1466 rcu_read_lock();
1467
1468 /* Candidate Source Address (section 4)
1469 * - multicast and link-local destination address,
1470 * the set of candidate source address MUST only
1471 * include addresses assigned to interfaces
1472 * belonging to the same link as the outgoing
1473 * interface.
1474 * (- For site-local destination addresses, the
1475 * set of candidate source addresses MUST only
1476 * include addresses assigned to interfaces
1477 * belonging to the same site as the outgoing
1478 * interface.)
1479 * - "It is RECOMMENDED that the candidate source addresses
1480 * be the set of unicast addresses assigned to the
1481 * interface that will be used to send to the destination
1482 * (the 'outgoing' interface)." (RFC 6724)
1483 */
1484 if (dst_dev) {
1485 idev = __in6_dev_get(dst_dev);
1486 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1487 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1488 (idev && idev->cnf.use_oif_addrs_only)) {
1489 use_oif_addr = true;
1490 }
1491 }
1492
1493 if (use_oif_addr) {
1494 if (idev)
1495 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1496 } else {
1497 for_each_netdev_rcu(net, dev) {
1498 idev = __in6_dev_get(dev);
1499 if (!idev)
1500 continue;
1501 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1502 }
1503 }
1504 rcu_read_unlock();
1505
1506 hiscore = &scores[hiscore_idx];
1507 if (!hiscore->ifa)
1508 return -EADDRNOTAVAIL;
1509
1510 *saddr = hiscore->ifa->addr;
1511 in6_ifa_put(hiscore->ifa);
1512 return 0;
1513 }
1514 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1515
1516 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1517 u32 banned_flags)
1518 {
1519 struct inet6_ifaddr *ifp;
1520 int err = -EADDRNOTAVAIL;
1521
1522 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1523 if (ifp->scope > IFA_LINK)
1524 break;
1525 if (ifp->scope == IFA_LINK &&
1526 !(ifp->flags & banned_flags)) {
1527 *addr = ifp->addr;
1528 err = 0;
1529 break;
1530 }
1531 }
1532 return err;
1533 }
1534
1535 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1536 u32 banned_flags)
1537 {
1538 struct inet6_dev *idev;
1539 int err = -EADDRNOTAVAIL;
1540
1541 rcu_read_lock();
1542 idev = __in6_dev_get(dev);
1543 if (idev) {
1544 read_lock_bh(&idev->lock);
1545 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1546 read_unlock_bh(&idev->lock);
1547 }
1548 rcu_read_unlock();
1549 return err;
1550 }
1551
1552 static int ipv6_count_addresses(struct inet6_dev *idev)
1553 {
1554 int cnt = 0;
1555 struct inet6_ifaddr *ifp;
1556
1557 read_lock_bh(&idev->lock);
1558 list_for_each_entry(ifp, &idev->addr_list, if_list)
1559 cnt++;
1560 read_unlock_bh(&idev->lock);
1561 return cnt;
1562 }
1563
1564 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1565 const struct net_device *dev, int strict)
1566 {
1567 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1568 }
1569 EXPORT_SYMBOL(ipv6_chk_addr);
1570
1571 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1572 const struct net_device *dev, int strict,
1573 u32 banned_flags)
1574 {
1575 struct inet6_ifaddr *ifp;
1576 unsigned int hash = inet6_addr_hash(addr);
1577 u32 ifp_flags;
1578
1579 rcu_read_lock_bh();
1580 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1581 if (!net_eq(dev_net(ifp->idev->dev), net))
1582 continue;
1583 /* Decouple optimistic from tentative for evaluation here.
1584 * Ban optimistic addresses explicitly, when required.
1585 */
1586 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1587 ? (ifp->flags&~IFA_F_TENTATIVE)
1588 : ifp->flags;
1589 if (ipv6_addr_equal(&ifp->addr, addr) &&
1590 !(ifp_flags&banned_flags) &&
1591 (!dev || ifp->idev->dev == dev ||
1592 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1593 rcu_read_unlock_bh();
1594 return 1;
1595 }
1596 }
1597
1598 rcu_read_unlock_bh();
1599 return 0;
1600 }
1601 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1602
1603 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1604 struct net_device *dev)
1605 {
1606 unsigned int hash = inet6_addr_hash(addr);
1607 struct inet6_ifaddr *ifp;
1608
1609 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1610 if (!net_eq(dev_net(ifp->idev->dev), net))
1611 continue;
1612 if (ipv6_addr_equal(&ifp->addr, addr)) {
1613 if (!dev || ifp->idev->dev == dev)
1614 return true;
1615 }
1616 }
1617 return false;
1618 }
1619
1620 /* Compares an address/prefix_len with addresses on device @dev.
1621 * If one is found it returns true.
1622 */
1623 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1624 const unsigned int prefix_len, struct net_device *dev)
1625 {
1626 struct inet6_dev *idev;
1627 struct inet6_ifaddr *ifa;
1628 bool ret = false;
1629
1630 rcu_read_lock();
1631 idev = __in6_dev_get(dev);
1632 if (idev) {
1633 read_lock_bh(&idev->lock);
1634 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1635 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1636 if (ret)
1637 break;
1638 }
1639 read_unlock_bh(&idev->lock);
1640 }
1641 rcu_read_unlock();
1642
1643 return ret;
1644 }
1645 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1646
1647 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1648 {
1649 struct inet6_dev *idev;
1650 struct inet6_ifaddr *ifa;
1651 int onlink;
1652
1653 onlink = 0;
1654 rcu_read_lock();
1655 idev = __in6_dev_get(dev);
1656 if (idev) {
1657 read_lock_bh(&idev->lock);
1658 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1659 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1660 ifa->prefix_len);
1661 if (onlink)
1662 break;
1663 }
1664 read_unlock_bh(&idev->lock);
1665 }
1666 rcu_read_unlock();
1667 return onlink;
1668 }
1669 EXPORT_SYMBOL(ipv6_chk_prefix);
1670
1671 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1672 struct net_device *dev, int strict)
1673 {
1674 struct inet6_ifaddr *ifp, *result = NULL;
1675 unsigned int hash = inet6_addr_hash(addr);
1676
1677 rcu_read_lock_bh();
1678 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1679 if (!net_eq(dev_net(ifp->idev->dev), net))
1680 continue;
1681 if (ipv6_addr_equal(&ifp->addr, addr)) {
1682 if (!dev || ifp->idev->dev == dev ||
1683 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1684 result = ifp;
1685 in6_ifa_hold(ifp);
1686 break;
1687 }
1688 }
1689 }
1690 rcu_read_unlock_bh();
1691
1692 return result;
1693 }
1694
1695 /* Gets referenced address, destroys ifaddr */
1696
1697 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1698 {
1699 if (ifp->flags&IFA_F_PERMANENT) {
1700 spin_lock_bh(&ifp->lock);
1701 addrconf_del_dad_work(ifp);
1702 ifp->flags |= IFA_F_TENTATIVE;
1703 if (dad_failed)
1704 ifp->flags |= IFA_F_DADFAILED;
1705 spin_unlock_bh(&ifp->lock);
1706 if (dad_failed)
1707 ipv6_ifa_notify(0, ifp);
1708 in6_ifa_put(ifp);
1709 } else if (ifp->flags&IFA_F_TEMPORARY) {
1710 struct inet6_ifaddr *ifpub;
1711 spin_lock_bh(&ifp->lock);
1712 ifpub = ifp->ifpub;
1713 if (ifpub) {
1714 in6_ifa_hold(ifpub);
1715 spin_unlock_bh(&ifp->lock);
1716 ipv6_create_tempaddr(ifpub, ifp);
1717 in6_ifa_put(ifpub);
1718 } else {
1719 spin_unlock_bh(&ifp->lock);
1720 }
1721 ipv6_del_addr(ifp);
1722 } else {
1723 ipv6_del_addr(ifp);
1724 }
1725 }
1726
1727 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1728 {
1729 int err = -ENOENT;
1730
1731 spin_lock_bh(&ifp->lock);
1732 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1733 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1734 err = 0;
1735 }
1736 spin_unlock_bh(&ifp->lock);
1737
1738 return err;
1739 }
1740
1741 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1742 {
1743 struct in6_addr addr;
1744 struct inet6_dev *idev = ifp->idev;
1745 struct net *net = dev_net(ifp->idev->dev);
1746
1747 if (addrconf_dad_end(ifp)) {
1748 in6_ifa_put(ifp);
1749 return;
1750 }
1751
1752 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1753 ifp->idev->dev->name, &ifp->addr);
1754
1755 spin_lock_bh(&ifp->lock);
1756
1757 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1758 int scope = ifp->scope;
1759 u32 flags = ifp->flags;
1760 struct in6_addr new_addr;
1761 struct inet6_ifaddr *ifp2;
1762 u32 valid_lft, preferred_lft;
1763 int pfxlen = ifp->prefix_len;
1764 int retries = ifp->stable_privacy_retry + 1;
1765
1766 if (retries > net->ipv6.sysctl.idgen_retries) {
1767 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1768 ifp->idev->dev->name);
1769 goto errdad;
1770 }
1771
1772 new_addr = ifp->addr;
1773 if (ipv6_generate_stable_address(&new_addr, retries,
1774 idev))
1775 goto errdad;
1776
1777 valid_lft = ifp->valid_lft;
1778 preferred_lft = ifp->prefered_lft;
1779
1780 spin_unlock_bh(&ifp->lock);
1781
1782 if (idev->cnf.max_addresses &&
1783 ipv6_count_addresses(idev) >=
1784 idev->cnf.max_addresses)
1785 goto lock_errdad;
1786
1787 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1788 ifp->idev->dev->name);
1789
1790 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1791 scope, flags, valid_lft,
1792 preferred_lft);
1793 if (IS_ERR(ifp2))
1794 goto lock_errdad;
1795
1796 spin_lock_bh(&ifp2->lock);
1797 ifp2->stable_privacy_retry = retries;
1798 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1799 spin_unlock_bh(&ifp2->lock);
1800
1801 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1802 in6_ifa_put(ifp2);
1803 lock_errdad:
1804 spin_lock_bh(&ifp->lock);
1805 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1806 addr.s6_addr32[0] = htonl(0xfe800000);
1807 addr.s6_addr32[1] = 0;
1808
1809 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1810 ipv6_addr_equal(&ifp->addr, &addr)) {
1811 /* DAD failed for link-local based on MAC address */
1812 idev->cnf.disable_ipv6 = 1;
1813
1814 pr_info("%s: IPv6 being disabled!\n",
1815 ifp->idev->dev->name);
1816 }
1817 }
1818
1819 errdad:
1820 /* transition from _POSTDAD to _ERRDAD */
1821 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1822 spin_unlock_bh(&ifp->lock);
1823
1824 addrconf_mod_dad_work(ifp, 0);
1825 }
1826
1827 /* Join to solicited addr multicast group.
1828 * caller must hold RTNL */
1829 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1830 {
1831 struct in6_addr maddr;
1832
1833 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1834 return;
1835
1836 addrconf_addr_solict_mult(addr, &maddr);
1837 ipv6_dev_mc_inc(dev, &maddr);
1838 }
1839
1840 /* caller must hold RTNL */
1841 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1842 {
1843 struct in6_addr maddr;
1844
1845 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1846 return;
1847
1848 addrconf_addr_solict_mult(addr, &maddr);
1849 __ipv6_dev_mc_dec(idev, &maddr);
1850 }
1851
1852 /* caller must hold RTNL */
1853 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1854 {
1855 struct in6_addr addr;
1856
1857 if (ifp->prefix_len >= 127) /* RFC 6164 */
1858 return;
1859 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1860 if (ipv6_addr_any(&addr))
1861 return;
1862 __ipv6_dev_ac_inc(ifp->idev, &addr);
1863 }
1864
1865 /* caller must hold RTNL */
1866 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1867 {
1868 struct in6_addr addr;
1869
1870 if (ifp->prefix_len >= 127) /* RFC 6164 */
1871 return;
1872 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1873 if (ipv6_addr_any(&addr))
1874 return;
1875 __ipv6_dev_ac_dec(ifp->idev, &addr);
1876 }
1877
1878 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1879 {
1880 if (dev->addr_len != ETH_ALEN)
1881 return -1;
1882 memcpy(eui, dev->dev_addr, 3);
1883 memcpy(eui + 5, dev->dev_addr + 3, 3);
1884
1885 /*
1886 * The zSeries OSA network cards can be shared among various
1887 * OS instances, but the OSA cards have only one MAC address.
1888 * This leads to duplicate address conflicts in conjunction
1889 * with IPv6 if more than one instance uses the same card.
1890 *
1891 * The driver for these cards can deliver a unique 16-bit
1892 * identifier for each instance sharing the same card. It is
1893 * placed instead of 0xFFFE in the interface identifier. The
1894 * "u" bit of the interface identifier is not inverted in this
1895 * case. Hence the resulting interface identifier has local
1896 * scope according to RFC2373.
1897 */
1898 if (dev->dev_id) {
1899 eui[3] = (dev->dev_id >> 8) & 0xFF;
1900 eui[4] = dev->dev_id & 0xFF;
1901 } else {
1902 eui[3] = 0xFF;
1903 eui[4] = 0xFE;
1904 eui[0] ^= 2;
1905 }
1906 return 0;
1907 }
1908
1909 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1910 {
1911 if (dev->addr_len != IEEE802154_ADDR_LEN)
1912 return -1;
1913 memcpy(eui, dev->dev_addr, 8);
1914 eui[0] ^= 2;
1915 return 0;
1916 }
1917
1918 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1919 {
1920 union fwnet_hwaddr *ha;
1921
1922 if (dev->addr_len != FWNET_ALEN)
1923 return -1;
1924
1925 ha = (union fwnet_hwaddr *)dev->dev_addr;
1926
1927 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1928 eui[0] ^= 2;
1929 return 0;
1930 }
1931
1932 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1933 {
1934 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1935 if (dev->addr_len != ARCNET_ALEN)
1936 return -1;
1937 memset(eui, 0, 7);
1938 eui[7] = *(u8 *)dev->dev_addr;
1939 return 0;
1940 }
1941
1942 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1943 {
1944 if (dev->addr_len != INFINIBAND_ALEN)
1945 return -1;
1946 memcpy(eui, dev->dev_addr + 12, 8);
1947 eui[0] |= 2;
1948 return 0;
1949 }
1950
1951 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1952 {
1953 if (addr == 0)
1954 return -1;
1955 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1956 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1957 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1958 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1959 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1960 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1961 eui[1] = 0;
1962 eui[2] = 0x5E;
1963 eui[3] = 0xFE;
1964 memcpy(eui + 4, &addr, 4);
1965 return 0;
1966 }
1967
1968 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1969 {
1970 if (dev->priv_flags & IFF_ISATAP)
1971 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1972 return -1;
1973 }
1974
1975 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1976 {
1977 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1978 }
1979
1980 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1981 {
1982 memcpy(eui, dev->perm_addr, 3);
1983 memcpy(eui + 5, dev->perm_addr + 3, 3);
1984 eui[3] = 0xFF;
1985 eui[4] = 0xFE;
1986 eui[0] ^= 2;
1987 return 0;
1988 }
1989
1990 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1991 {
1992 switch (dev->type) {
1993 case ARPHRD_ETHER:
1994 case ARPHRD_FDDI:
1995 return addrconf_ifid_eui48(eui, dev);
1996 case ARPHRD_ARCNET:
1997 return addrconf_ifid_arcnet(eui, dev);
1998 case ARPHRD_INFINIBAND:
1999 return addrconf_ifid_infiniband(eui, dev);
2000 case ARPHRD_SIT:
2001 return addrconf_ifid_sit(eui, dev);
2002 case ARPHRD_IPGRE:
2003 return addrconf_ifid_gre(eui, dev);
2004 case ARPHRD_6LOWPAN:
2005 case ARPHRD_IEEE802154:
2006 return addrconf_ifid_eui64(eui, dev);
2007 case ARPHRD_IEEE1394:
2008 return addrconf_ifid_ieee1394(eui, dev);
2009 case ARPHRD_TUNNEL6:
2010 return addrconf_ifid_ip6tnl(eui, dev);
2011 }
2012 return -1;
2013 }
2014
2015 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2016 {
2017 int err = -1;
2018 struct inet6_ifaddr *ifp;
2019
2020 read_lock_bh(&idev->lock);
2021 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2022 if (ifp->scope > IFA_LINK)
2023 break;
2024 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2025 memcpy(eui, ifp->addr.s6_addr+8, 8);
2026 err = 0;
2027 break;
2028 }
2029 }
2030 read_unlock_bh(&idev->lock);
2031 return err;
2032 }
2033
2034 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2035 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2036 {
2037 regen:
2038 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2039 idev->rndid[0] &= ~0x02;
2040
2041 /*
2042 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2043 * check if generated address is not inappropriate
2044 *
2045 * - Reserved subnet anycast (RFC 2526)
2046 * 11111101 11....11 1xxxxxxx
2047 * - ISATAP (RFC4214) 6.1
2048 * 00-00-5E-FE-xx-xx-xx-xx
2049 * - value 0
2050 * - XXX: already assigned to an address on the device
2051 */
2052 if (idev->rndid[0] == 0xfd &&
2053 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2054 (idev->rndid[7]&0x80))
2055 goto regen;
2056 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2057 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2058 goto regen;
2059 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2060 goto regen;
2061 }
2062 }
2063
2064 static void ipv6_regen_rndid(unsigned long data)
2065 {
2066 struct inet6_dev *idev = (struct inet6_dev *) data;
2067 unsigned long expires;
2068
2069 rcu_read_lock_bh();
2070 write_lock_bh(&idev->lock);
2071
2072 if (idev->dead)
2073 goto out;
2074
2075 __ipv6_regen_rndid(idev);
2076
2077 expires = jiffies +
2078 idev->cnf.temp_prefered_lft * HZ -
2079 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2080 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2081 idev->cnf.max_desync_factor * HZ;
2082 if (time_before(expires, jiffies)) {
2083 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2084 __func__, idev->dev->name);
2085 goto out;
2086 }
2087
2088 if (!mod_timer(&idev->regen_timer, expires))
2089 in6_dev_hold(idev);
2090
2091 out:
2092 write_unlock_bh(&idev->lock);
2093 rcu_read_unlock_bh();
2094 in6_dev_put(idev);
2095 }
2096
2097 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2098 {
2099 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2100 __ipv6_regen_rndid(idev);
2101 }
2102
2103 /*
2104 * Add prefix route.
2105 */
2106
2107 static void
2108 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2109 unsigned long expires, u32 flags)
2110 {
2111 struct fib6_config cfg = {
2112 .fc_table = RT6_TABLE_PREFIX,
2113 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2114 .fc_ifindex = dev->ifindex,
2115 .fc_expires = expires,
2116 .fc_dst_len = plen,
2117 .fc_flags = RTF_UP | flags,
2118 .fc_nlinfo.nl_net = dev_net(dev),
2119 .fc_protocol = RTPROT_KERNEL,
2120 };
2121
2122 cfg.fc_dst = *pfx;
2123
2124 /* Prevent useless cloning on PtP SIT.
2125 This thing is done here expecting that the whole
2126 class of non-broadcast devices need not cloning.
2127 */
2128 #if IS_ENABLED(CONFIG_IPV6_SIT)
2129 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2130 cfg.fc_flags |= RTF_NONEXTHOP;
2131 #endif
2132
2133 ip6_route_add(&cfg);
2134 }
2135
2136
2137 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2138 int plen,
2139 const struct net_device *dev,
2140 u32 flags, u32 noflags)
2141 {
2142 struct fib6_node *fn;
2143 struct rt6_info *rt = NULL;
2144 struct fib6_table *table;
2145
2146 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2147 if (!table)
2148 return NULL;
2149
2150 read_lock_bh(&table->tb6_lock);
2151 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2152 if (!fn)
2153 goto out;
2154
2155 noflags |= RTF_CACHE;
2156 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2157 if (rt->dst.dev->ifindex != dev->ifindex)
2158 continue;
2159 if ((rt->rt6i_flags & flags) != flags)
2160 continue;
2161 if ((rt->rt6i_flags & noflags) != 0)
2162 continue;
2163 dst_hold(&rt->dst);
2164 break;
2165 }
2166 out:
2167 read_unlock_bh(&table->tb6_lock);
2168 return rt;
2169 }
2170
2171
2172 /* Create "default" multicast route to the interface */
2173
2174 static void addrconf_add_mroute(struct net_device *dev)
2175 {
2176 struct fib6_config cfg = {
2177 .fc_table = RT6_TABLE_LOCAL,
2178 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2179 .fc_ifindex = dev->ifindex,
2180 .fc_dst_len = 8,
2181 .fc_flags = RTF_UP,
2182 .fc_nlinfo.nl_net = dev_net(dev),
2183 };
2184
2185 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2186
2187 ip6_route_add(&cfg);
2188 }
2189
2190 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2191 {
2192 struct inet6_dev *idev;
2193
2194 ASSERT_RTNL();
2195
2196 idev = ipv6_find_idev(dev);
2197 if (!idev)
2198 return ERR_PTR(-ENOBUFS);
2199
2200 if (idev->cnf.disable_ipv6)
2201 return ERR_PTR(-EACCES);
2202
2203 /* Add default multicast route */
2204 if (!(dev->flags & IFF_LOOPBACK))
2205 addrconf_add_mroute(dev);
2206
2207 return idev;
2208 }
2209
2210 static void manage_tempaddrs(struct inet6_dev *idev,
2211 struct inet6_ifaddr *ifp,
2212 __u32 valid_lft, __u32 prefered_lft,
2213 bool create, unsigned long now)
2214 {
2215 u32 flags;
2216 struct inet6_ifaddr *ift;
2217
2218 read_lock_bh(&idev->lock);
2219 /* update all temporary addresses in the list */
2220 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2221 int age, max_valid, max_prefered;
2222
2223 if (ifp != ift->ifpub)
2224 continue;
2225
2226 /* RFC 4941 section 3.3:
2227 * If a received option will extend the lifetime of a public
2228 * address, the lifetimes of temporary addresses should
2229 * be extended, subject to the overall constraint that no
2230 * temporary addresses should ever remain "valid" or "preferred"
2231 * for a time longer than (TEMP_VALID_LIFETIME) or
2232 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2233 */
2234 age = (now - ift->cstamp) / HZ;
2235 max_valid = idev->cnf.temp_valid_lft - age;
2236 if (max_valid < 0)
2237 max_valid = 0;
2238
2239 max_prefered = idev->cnf.temp_prefered_lft -
2240 idev->cnf.max_desync_factor - age;
2241 if (max_prefered < 0)
2242 max_prefered = 0;
2243
2244 if (valid_lft > max_valid)
2245 valid_lft = max_valid;
2246
2247 if (prefered_lft > max_prefered)
2248 prefered_lft = max_prefered;
2249
2250 spin_lock(&ift->lock);
2251 flags = ift->flags;
2252 ift->valid_lft = valid_lft;
2253 ift->prefered_lft = prefered_lft;
2254 ift->tstamp = now;
2255 if (prefered_lft > 0)
2256 ift->flags &= ~IFA_F_DEPRECATED;
2257
2258 spin_unlock(&ift->lock);
2259 if (!(flags&IFA_F_TENTATIVE))
2260 ipv6_ifa_notify(0, ift);
2261 }
2262
2263 if ((create || list_empty(&idev->tempaddr_list)) &&
2264 idev->cnf.use_tempaddr > 0) {
2265 /* When a new public address is created as described
2266 * in [ADDRCONF], also create a new temporary address.
2267 * Also create a temporary address if it's enabled but
2268 * no temporary address currently exists.
2269 */
2270 read_unlock_bh(&idev->lock);
2271 ipv6_create_tempaddr(ifp, NULL);
2272 } else {
2273 read_unlock_bh(&idev->lock);
2274 }
2275 }
2276
2277 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2278 {
2279 struct prefix_info *pinfo;
2280 __u32 valid_lft;
2281 __u32 prefered_lft;
2282 int addr_type;
2283 u32 addr_flags = 0;
2284 struct inet6_dev *in6_dev;
2285 struct net *net = dev_net(dev);
2286
2287 pinfo = (struct prefix_info *) opt;
2288
2289 if (len < sizeof(struct prefix_info)) {
2290 ADBG("addrconf: prefix option too short\n");
2291 return;
2292 }
2293
2294 /*
2295 * Validation checks ([ADDRCONF], page 19)
2296 */
2297
2298 addr_type = ipv6_addr_type(&pinfo->prefix);
2299
2300 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2301 return;
2302
2303 valid_lft = ntohl(pinfo->valid);
2304 prefered_lft = ntohl(pinfo->prefered);
2305
2306 if (prefered_lft > valid_lft) {
2307 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2308 return;
2309 }
2310
2311 in6_dev = in6_dev_get(dev);
2312
2313 if (!in6_dev) {
2314 net_dbg_ratelimited("addrconf: device %s not configured\n",
2315 dev->name);
2316 return;
2317 }
2318
2319 /*
2320 * Two things going on here:
2321 * 1) Add routes for on-link prefixes
2322 * 2) Configure prefixes with the auto flag set
2323 */
2324
2325 if (pinfo->onlink) {
2326 struct rt6_info *rt;
2327 unsigned long rt_expires;
2328
2329 /* Avoid arithmetic overflow. Really, we could
2330 * save rt_expires in seconds, likely valid_lft,
2331 * but it would require division in fib gc, that it
2332 * not good.
2333 */
2334 if (HZ > USER_HZ)
2335 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2336 else
2337 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2338
2339 if (addrconf_finite_timeout(rt_expires))
2340 rt_expires *= HZ;
2341
2342 rt = addrconf_get_prefix_route(&pinfo->prefix,
2343 pinfo->prefix_len,
2344 dev,
2345 RTF_ADDRCONF | RTF_PREFIX_RT,
2346 RTF_GATEWAY | RTF_DEFAULT);
2347
2348 if (rt) {
2349 /* Autoconf prefix route */
2350 if (valid_lft == 0) {
2351 ip6_del_rt(rt);
2352 rt = NULL;
2353 } else if (addrconf_finite_timeout(rt_expires)) {
2354 /* not infinity */
2355 rt6_set_expires(rt, jiffies + rt_expires);
2356 } else {
2357 rt6_clean_expires(rt);
2358 }
2359 } else if (valid_lft) {
2360 clock_t expires = 0;
2361 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2362 if (addrconf_finite_timeout(rt_expires)) {
2363 /* not infinity */
2364 flags |= RTF_EXPIRES;
2365 expires = jiffies_to_clock_t(rt_expires);
2366 }
2367 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2368 dev, expires, flags);
2369 }
2370 ip6_rt_put(rt);
2371 }
2372
2373 /* Try to figure out our local address for this prefix */
2374
2375 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2376 struct inet6_ifaddr *ifp;
2377 struct in6_addr addr;
2378 int create = 0, update_lft = 0;
2379 bool tokenized = false;
2380
2381 if (pinfo->prefix_len == 64) {
2382 memcpy(&addr, &pinfo->prefix, 8);
2383
2384 if (!ipv6_addr_any(&in6_dev->token)) {
2385 read_lock_bh(&in6_dev->lock);
2386 memcpy(addr.s6_addr + 8,
2387 in6_dev->token.s6_addr + 8, 8);
2388 read_unlock_bh(&in6_dev->lock);
2389 tokenized = true;
2390 } else if (in6_dev->addr_gen_mode ==
2391 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2392 !ipv6_generate_stable_address(&addr, 0,
2393 in6_dev)) {
2394 addr_flags |= IFA_F_STABLE_PRIVACY;
2395 goto ok;
2396 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2397 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2398 in6_dev_put(in6_dev);
2399 return;
2400 }
2401 goto ok;
2402 }
2403 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2404 pinfo->prefix_len);
2405 in6_dev_put(in6_dev);
2406 return;
2407
2408 ok:
2409
2410 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2411
2412 if (!ifp && valid_lft) {
2413 int max_addresses = in6_dev->cnf.max_addresses;
2414
2415 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2416 if (in6_dev->cnf.optimistic_dad &&
2417 !net->ipv6.devconf_all->forwarding && sllao)
2418 addr_flags = IFA_F_OPTIMISTIC;
2419 #endif
2420
2421 /* Do not allow to create too much of autoconfigured
2422 * addresses; this would be too easy way to crash kernel.
2423 */
2424 if (!max_addresses ||
2425 ipv6_count_addresses(in6_dev) < max_addresses)
2426 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2427 pinfo->prefix_len,
2428 addr_type&IPV6_ADDR_SCOPE_MASK,
2429 addr_flags, valid_lft,
2430 prefered_lft);
2431
2432 if (IS_ERR_OR_NULL(ifp)) {
2433 in6_dev_put(in6_dev);
2434 return;
2435 }
2436
2437 update_lft = 0;
2438 create = 1;
2439 spin_lock_bh(&ifp->lock);
2440 ifp->flags |= IFA_F_MANAGETEMPADDR;
2441 ifp->cstamp = jiffies;
2442 ifp->tokenized = tokenized;
2443 spin_unlock_bh(&ifp->lock);
2444 addrconf_dad_start(ifp);
2445 }
2446
2447 if (ifp) {
2448 u32 flags;
2449 unsigned long now;
2450 u32 stored_lft;
2451
2452 /* update lifetime (RFC2462 5.5.3 e) */
2453 spin_lock_bh(&ifp->lock);
2454 now = jiffies;
2455 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2456 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2457 else
2458 stored_lft = 0;
2459 if (!update_lft && !create && stored_lft) {
2460 const u32 minimum_lft = min_t(u32,
2461 stored_lft, MIN_VALID_LIFETIME);
2462 valid_lft = max(valid_lft, minimum_lft);
2463
2464 /* RFC4862 Section 5.5.3e:
2465 * "Note that the preferred lifetime of the
2466 * corresponding address is always reset to
2467 * the Preferred Lifetime in the received
2468 * Prefix Information option, regardless of
2469 * whether the valid lifetime is also reset or
2470 * ignored."
2471 *
2472 * So we should always update prefered_lft here.
2473 */
2474 update_lft = 1;
2475 }
2476
2477 if (update_lft) {
2478 ifp->valid_lft = valid_lft;
2479 ifp->prefered_lft = prefered_lft;
2480 ifp->tstamp = now;
2481 flags = ifp->flags;
2482 ifp->flags &= ~IFA_F_DEPRECATED;
2483 spin_unlock_bh(&ifp->lock);
2484
2485 if (!(flags&IFA_F_TENTATIVE))
2486 ipv6_ifa_notify(0, ifp);
2487 } else
2488 spin_unlock_bh(&ifp->lock);
2489
2490 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2491 create, now);
2492
2493 in6_ifa_put(ifp);
2494 addrconf_verify();
2495 }
2496 }
2497 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2498 in6_dev_put(in6_dev);
2499 }
2500
2501 /*
2502 * Set destination address.
2503 * Special case for SIT interfaces where we create a new "virtual"
2504 * device.
2505 */
2506 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2507 {
2508 struct in6_ifreq ireq;
2509 struct net_device *dev;
2510 int err = -EINVAL;
2511
2512 rtnl_lock();
2513
2514 err = -EFAULT;
2515 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2516 goto err_exit;
2517
2518 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2519
2520 err = -ENODEV;
2521 if (!dev)
2522 goto err_exit;
2523
2524 #if IS_ENABLED(CONFIG_IPV6_SIT)
2525 if (dev->type == ARPHRD_SIT) {
2526 const struct net_device_ops *ops = dev->netdev_ops;
2527 struct ifreq ifr;
2528 struct ip_tunnel_parm p;
2529
2530 err = -EADDRNOTAVAIL;
2531 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2532 goto err_exit;
2533
2534 memset(&p, 0, sizeof(p));
2535 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2536 p.iph.saddr = 0;
2537 p.iph.version = 4;
2538 p.iph.ihl = 5;
2539 p.iph.protocol = IPPROTO_IPV6;
2540 p.iph.ttl = 64;
2541 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2542
2543 if (ops->ndo_do_ioctl) {
2544 mm_segment_t oldfs = get_fs();
2545
2546 set_fs(KERNEL_DS);
2547 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2548 set_fs(oldfs);
2549 } else
2550 err = -EOPNOTSUPP;
2551
2552 if (err == 0) {
2553 err = -ENOBUFS;
2554 dev = __dev_get_by_name(net, p.name);
2555 if (!dev)
2556 goto err_exit;
2557 err = dev_open(dev);
2558 }
2559 }
2560 #endif
2561
2562 err_exit:
2563 rtnl_unlock();
2564 return err;
2565 }
2566
2567 static int ipv6_mc_config(struct sock *sk, bool join,
2568 const struct in6_addr *addr, int ifindex)
2569 {
2570 int ret;
2571
2572 ASSERT_RTNL();
2573
2574 lock_sock(sk);
2575 if (join)
2576 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2577 else
2578 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2579 release_sock(sk);
2580
2581 return ret;
2582 }
2583
2584 /*
2585 * Manual configuration of address on an interface
2586 */
2587 static int inet6_addr_add(struct net *net, int ifindex,
2588 const struct in6_addr *pfx,
2589 const struct in6_addr *peer_pfx,
2590 unsigned int plen, __u32 ifa_flags,
2591 __u32 prefered_lft, __u32 valid_lft)
2592 {
2593 struct inet6_ifaddr *ifp;
2594 struct inet6_dev *idev;
2595 struct net_device *dev;
2596 unsigned long timeout;
2597 clock_t expires;
2598 int scope;
2599 u32 flags;
2600
2601 ASSERT_RTNL();
2602
2603 if (plen > 128)
2604 return -EINVAL;
2605
2606 /* check the lifetime */
2607 if (!valid_lft || prefered_lft > valid_lft)
2608 return -EINVAL;
2609
2610 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2611 return -EINVAL;
2612
2613 dev = __dev_get_by_index(net, ifindex);
2614 if (!dev)
2615 return -ENODEV;
2616
2617 idev = addrconf_add_dev(dev);
2618 if (IS_ERR(idev))
2619 return PTR_ERR(idev);
2620
2621 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2622 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2623 true, pfx, ifindex);
2624
2625 if (ret < 0)
2626 return ret;
2627 }
2628
2629 scope = ipv6_addr_scope(pfx);
2630
2631 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2632 if (addrconf_finite_timeout(timeout)) {
2633 expires = jiffies_to_clock_t(timeout * HZ);
2634 valid_lft = timeout;
2635 flags = RTF_EXPIRES;
2636 } else {
2637 expires = 0;
2638 flags = 0;
2639 ifa_flags |= IFA_F_PERMANENT;
2640 }
2641
2642 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2643 if (addrconf_finite_timeout(timeout)) {
2644 if (timeout == 0)
2645 ifa_flags |= IFA_F_DEPRECATED;
2646 prefered_lft = timeout;
2647 }
2648
2649 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2650 valid_lft, prefered_lft);
2651
2652 if (!IS_ERR(ifp)) {
2653 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2654 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2655 expires, flags);
2656 }
2657
2658 /*
2659 * Note that section 3.1 of RFC 4429 indicates
2660 * that the Optimistic flag should not be set for
2661 * manually configured addresses
2662 */
2663 addrconf_dad_start(ifp);
2664 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2665 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2666 true, jiffies);
2667 in6_ifa_put(ifp);
2668 addrconf_verify_rtnl();
2669 return 0;
2670 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2671 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2672 false, pfx, ifindex);
2673 }
2674
2675 return PTR_ERR(ifp);
2676 }
2677
2678 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2679 const struct in6_addr *pfx, unsigned int plen)
2680 {
2681 struct inet6_ifaddr *ifp;
2682 struct inet6_dev *idev;
2683 struct net_device *dev;
2684
2685 if (plen > 128)
2686 return -EINVAL;
2687
2688 dev = __dev_get_by_index(net, ifindex);
2689 if (!dev)
2690 return -ENODEV;
2691
2692 idev = __in6_dev_get(dev);
2693 if (!idev)
2694 return -ENXIO;
2695
2696 read_lock_bh(&idev->lock);
2697 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2698 if (ifp->prefix_len == plen &&
2699 ipv6_addr_equal(pfx, &ifp->addr)) {
2700 in6_ifa_hold(ifp);
2701 read_unlock_bh(&idev->lock);
2702
2703 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2704 (ifa_flags & IFA_F_MANAGETEMPADDR))
2705 manage_tempaddrs(idev, ifp, 0, 0, false,
2706 jiffies);
2707 ipv6_del_addr(ifp);
2708 addrconf_verify_rtnl();
2709 if (ipv6_addr_is_multicast(pfx)) {
2710 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2711 false, pfx, dev->ifindex);
2712 }
2713 return 0;
2714 }
2715 }
2716 read_unlock_bh(&idev->lock);
2717 return -EADDRNOTAVAIL;
2718 }
2719
2720
2721 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2722 {
2723 struct in6_ifreq ireq;
2724 int err;
2725
2726 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2727 return -EPERM;
2728
2729 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2730 return -EFAULT;
2731
2732 rtnl_lock();
2733 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2734 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2735 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2736 rtnl_unlock();
2737 return err;
2738 }
2739
2740 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2741 {
2742 struct in6_ifreq ireq;
2743 int err;
2744
2745 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2746 return -EPERM;
2747
2748 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2749 return -EFAULT;
2750
2751 rtnl_lock();
2752 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2753 ireq.ifr6_prefixlen);
2754 rtnl_unlock();
2755 return err;
2756 }
2757
2758 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2759 int plen, int scope)
2760 {
2761 struct inet6_ifaddr *ifp;
2762
2763 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2764 scope, IFA_F_PERMANENT,
2765 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2766 if (!IS_ERR(ifp)) {
2767 spin_lock_bh(&ifp->lock);
2768 ifp->flags &= ~IFA_F_TENTATIVE;
2769 spin_unlock_bh(&ifp->lock);
2770 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2771 in6_ifa_put(ifp);
2772 }
2773 }
2774
2775 #if IS_ENABLED(CONFIG_IPV6_SIT)
2776 static void sit_add_v4_addrs(struct inet6_dev *idev)
2777 {
2778 struct in6_addr addr;
2779 struct net_device *dev;
2780 struct net *net = dev_net(idev->dev);
2781 int scope, plen;
2782 u32 pflags = 0;
2783
2784 ASSERT_RTNL();
2785
2786 memset(&addr, 0, sizeof(struct in6_addr));
2787 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2788
2789 if (idev->dev->flags&IFF_POINTOPOINT) {
2790 addr.s6_addr32[0] = htonl(0xfe800000);
2791 scope = IFA_LINK;
2792 plen = 64;
2793 } else {
2794 scope = IPV6_ADDR_COMPATv4;
2795 plen = 96;
2796 pflags |= RTF_NONEXTHOP;
2797 }
2798
2799 if (addr.s6_addr32[3]) {
2800 add_addr(idev, &addr, plen, scope);
2801 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2802 return;
2803 }
2804
2805 for_each_netdev(net, dev) {
2806 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2807 if (in_dev && (dev->flags & IFF_UP)) {
2808 struct in_ifaddr *ifa;
2809
2810 int flag = scope;
2811
2812 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2813
2814 addr.s6_addr32[3] = ifa->ifa_local;
2815
2816 if (ifa->ifa_scope == RT_SCOPE_LINK)
2817 continue;
2818 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2819 if (idev->dev->flags&IFF_POINTOPOINT)
2820 continue;
2821 flag |= IFA_HOST;
2822 }
2823
2824 add_addr(idev, &addr, plen, flag);
2825 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2826 pflags);
2827 }
2828 }
2829 }
2830 }
2831 #endif
2832
2833 static void init_loopback(struct net_device *dev)
2834 {
2835 struct inet6_dev *idev;
2836 struct net_device *sp_dev;
2837 struct inet6_ifaddr *sp_ifa;
2838 struct rt6_info *sp_rt;
2839
2840 /* ::1 */
2841
2842 ASSERT_RTNL();
2843
2844 idev = ipv6_find_idev(dev);
2845 if (!idev) {
2846 pr_debug("%s: add_dev failed\n", __func__);
2847 return;
2848 }
2849
2850 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2851
2852 /* Add routes to other interface's IPv6 addresses */
2853 for_each_netdev(dev_net(dev), sp_dev) {
2854 if (!strcmp(sp_dev->name, dev->name))
2855 continue;
2856
2857 idev = __in6_dev_get(sp_dev);
2858 if (!idev)
2859 continue;
2860
2861 read_lock_bh(&idev->lock);
2862 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2863
2864 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2865 continue;
2866
2867 if (sp_ifa->rt) {
2868 /* This dst has been added to garbage list when
2869 * lo device down, release this obsolete dst and
2870 * reallocate a new router for ifa.
2871 */
2872 if (sp_ifa->rt->dst.obsolete > 0) {
2873 ip6_rt_put(sp_ifa->rt);
2874 sp_ifa->rt = NULL;
2875 } else {
2876 continue;
2877 }
2878 }
2879
2880 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2881
2882 /* Failure cases are ignored */
2883 if (!IS_ERR(sp_rt)) {
2884 sp_ifa->rt = sp_rt;
2885 ip6_ins_rt(sp_rt);
2886 }
2887 }
2888 read_unlock_bh(&idev->lock);
2889 }
2890 }
2891
2892 static void addrconf_add_linklocal(struct inet6_dev *idev,
2893 const struct in6_addr *addr, u32 flags)
2894 {
2895 struct inet6_ifaddr *ifp;
2896 u32 addr_flags = flags | IFA_F_PERMANENT;
2897
2898 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2899 if (idev->cnf.optimistic_dad &&
2900 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2901 addr_flags |= IFA_F_OPTIMISTIC;
2902 #endif
2903
2904 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2905 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2906 if (!IS_ERR(ifp)) {
2907 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2908 addrconf_dad_start(ifp);
2909 in6_ifa_put(ifp);
2910 }
2911 }
2912
2913 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2914 {
2915 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2916 return true;
2917
2918 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2919 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2920 return true;
2921
2922 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2923 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2924 return true;
2925
2926 return false;
2927 }
2928
2929 static int ipv6_generate_stable_address(struct in6_addr *address,
2930 u8 dad_count,
2931 const struct inet6_dev *idev)
2932 {
2933 static DEFINE_SPINLOCK(lock);
2934 static __u32 digest[SHA_DIGEST_WORDS];
2935 static __u32 workspace[SHA_WORKSPACE_WORDS];
2936
2937 static union {
2938 char __data[SHA_MESSAGE_BYTES];
2939 struct {
2940 struct in6_addr secret;
2941 __be32 prefix[2];
2942 unsigned char hwaddr[MAX_ADDR_LEN];
2943 u8 dad_count;
2944 } __packed;
2945 } data;
2946
2947 struct in6_addr secret;
2948 struct in6_addr temp;
2949 struct net *net = dev_net(idev->dev);
2950
2951 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2952
2953 if (idev->cnf.stable_secret.initialized)
2954 secret = idev->cnf.stable_secret.secret;
2955 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2956 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2957 else
2958 return -1;
2959
2960 retry:
2961 spin_lock_bh(&lock);
2962
2963 sha_init(digest);
2964 memset(&data, 0, sizeof(data));
2965 memset(workspace, 0, sizeof(workspace));
2966 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
2967 data.prefix[0] = address->s6_addr32[0];
2968 data.prefix[1] = address->s6_addr32[1];
2969 data.secret = secret;
2970 data.dad_count = dad_count;
2971
2972 sha_transform(digest, data.__data, workspace);
2973
2974 temp = *address;
2975 temp.s6_addr32[2] = (__force __be32)digest[0];
2976 temp.s6_addr32[3] = (__force __be32)digest[1];
2977
2978 spin_unlock_bh(&lock);
2979
2980 if (ipv6_reserved_interfaceid(temp)) {
2981 dad_count++;
2982 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
2983 return -1;
2984 goto retry;
2985 }
2986
2987 *address = temp;
2988 return 0;
2989 }
2990
2991 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2992 {
2993 struct in6_addr addr;
2994
2995 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2996
2997 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
2998 if (!ipv6_generate_stable_address(&addr, 0, idev))
2999 addrconf_add_linklocal(idev, &addr,
3000 IFA_F_STABLE_PRIVACY);
3001 else if (prefix_route)
3002 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3003 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3004 /* addrconf_add_linklocal also adds a prefix_route and we
3005 * only need to care about prefix routes if ipv6_generate_eui64
3006 * couldn't generate one.
3007 */
3008 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3009 addrconf_add_linklocal(idev, &addr, 0);
3010 else if (prefix_route)
3011 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3012 }
3013 }
3014
3015 static void addrconf_dev_config(struct net_device *dev)
3016 {
3017 struct inet6_dev *idev;
3018
3019 ASSERT_RTNL();
3020
3021 if ((dev->type != ARPHRD_ETHER) &&
3022 (dev->type != ARPHRD_FDDI) &&
3023 (dev->type != ARPHRD_ARCNET) &&
3024 (dev->type != ARPHRD_INFINIBAND) &&
3025 (dev->type != ARPHRD_IEEE802154) &&
3026 (dev->type != ARPHRD_IEEE1394) &&
3027 (dev->type != ARPHRD_TUNNEL6) &&
3028 (dev->type != ARPHRD_6LOWPAN)) {
3029 /* Alas, we support only Ethernet autoconfiguration. */
3030 return;
3031 }
3032
3033 idev = addrconf_add_dev(dev);
3034 if (IS_ERR(idev))
3035 return;
3036
3037 addrconf_addr_gen(idev, false);
3038 }
3039
3040 #if IS_ENABLED(CONFIG_IPV6_SIT)
3041 static void addrconf_sit_config(struct net_device *dev)
3042 {
3043 struct inet6_dev *idev;
3044
3045 ASSERT_RTNL();
3046
3047 /*
3048 * Configure the tunnel with one of our IPv4
3049 * addresses... we should configure all of
3050 * our v4 addrs in the tunnel
3051 */
3052
3053 idev = ipv6_find_idev(dev);
3054 if (!idev) {
3055 pr_debug("%s: add_dev failed\n", __func__);
3056 return;
3057 }
3058
3059 if (dev->priv_flags & IFF_ISATAP) {
3060 addrconf_addr_gen(idev, false);
3061 return;
3062 }
3063
3064 sit_add_v4_addrs(idev);
3065
3066 if (dev->flags&IFF_POINTOPOINT)
3067 addrconf_add_mroute(dev);
3068 }
3069 #endif
3070
3071 #if IS_ENABLED(CONFIG_NET_IPGRE)
3072 static void addrconf_gre_config(struct net_device *dev)
3073 {
3074 struct inet6_dev *idev;
3075
3076 ASSERT_RTNL();
3077
3078 idev = ipv6_find_idev(dev);
3079 if (!idev) {
3080 pr_debug("%s: add_dev failed\n", __func__);
3081 return;
3082 }
3083
3084 addrconf_addr_gen(idev, true);
3085 }
3086 #endif
3087
3088 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3089 void *ptr)
3090 {
3091 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3092 struct inet6_dev *idev = __in6_dev_get(dev);
3093 int run_pending = 0;
3094 int err;
3095
3096 switch (event) {
3097 case NETDEV_REGISTER:
3098 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3099 idev = ipv6_add_dev(dev);
3100 if (IS_ERR(idev))
3101 return notifier_from_errno(PTR_ERR(idev));
3102 }
3103 break;
3104
3105 case NETDEV_UP:
3106 case NETDEV_CHANGE:
3107 if (dev->flags & IFF_SLAVE)
3108 break;
3109
3110 if (idev && idev->cnf.disable_ipv6)
3111 break;
3112
3113 if (event == NETDEV_UP) {
3114 if (!addrconf_qdisc_ok(dev)) {
3115 /* device is not ready yet. */
3116 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3117 dev->name);
3118 break;
3119 }
3120
3121 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3122 idev = ipv6_add_dev(dev);
3123
3124 if (!IS_ERR_OR_NULL(idev)) {
3125 idev->if_flags |= IF_READY;
3126 run_pending = 1;
3127 }
3128 } else {
3129 if (!addrconf_qdisc_ok(dev)) {
3130 /* device is still not ready. */
3131 break;
3132 }
3133
3134 if (idev) {
3135 if (idev->if_flags & IF_READY)
3136 /* device is already configured. */
3137 break;
3138 idev->if_flags |= IF_READY;
3139 }
3140
3141 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3142 dev->name);
3143
3144 run_pending = 1;
3145 }
3146
3147 switch (dev->type) {
3148 #if IS_ENABLED(CONFIG_IPV6_SIT)
3149 case ARPHRD_SIT:
3150 addrconf_sit_config(dev);
3151 break;
3152 #endif
3153 #if IS_ENABLED(CONFIG_NET_IPGRE)
3154 case ARPHRD_IPGRE:
3155 addrconf_gre_config(dev);
3156 break;
3157 #endif
3158 case ARPHRD_LOOPBACK:
3159 init_loopback(dev);
3160 break;
3161
3162 default:
3163 addrconf_dev_config(dev);
3164 break;
3165 }
3166
3167 if (!IS_ERR_OR_NULL(idev)) {
3168 if (run_pending)
3169 addrconf_dad_run(idev);
3170
3171 /*
3172 * If the MTU changed during the interface down,
3173 * when the interface up, the changed MTU must be
3174 * reflected in the idev as well as routers.
3175 */
3176 if (idev->cnf.mtu6 != dev->mtu &&
3177 dev->mtu >= IPV6_MIN_MTU) {
3178 rt6_mtu_change(dev, dev->mtu);
3179 idev->cnf.mtu6 = dev->mtu;
3180 }
3181 idev->tstamp = jiffies;
3182 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3183
3184 /*
3185 * If the changed mtu during down is lower than
3186 * IPV6_MIN_MTU stop IPv6 on this interface.
3187 */
3188 if (dev->mtu < IPV6_MIN_MTU)
3189 addrconf_ifdown(dev, 1);
3190 }
3191 break;
3192
3193 case NETDEV_CHANGEMTU:
3194 if (idev && dev->mtu >= IPV6_MIN_MTU) {
3195 rt6_mtu_change(dev, dev->mtu);
3196 idev->cnf.mtu6 = dev->mtu;
3197 break;
3198 }
3199
3200 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3201 idev = ipv6_add_dev(dev);
3202 if (!IS_ERR(idev))
3203 break;
3204 }
3205
3206 /*
3207 * if MTU under IPV6_MIN_MTU.
3208 * Stop IPv6 on this interface.
3209 */
3210
3211 case NETDEV_DOWN:
3212 case NETDEV_UNREGISTER:
3213 /*
3214 * Remove all addresses from this interface.
3215 */
3216 addrconf_ifdown(dev, event != NETDEV_DOWN);
3217 break;
3218
3219 case NETDEV_CHANGENAME:
3220 if (idev) {
3221 snmp6_unregister_dev(idev);
3222 addrconf_sysctl_unregister(idev);
3223 err = addrconf_sysctl_register(idev);
3224 if (err)
3225 return notifier_from_errno(err);
3226 err = snmp6_register_dev(idev);
3227 if (err) {
3228 addrconf_sysctl_unregister(idev);
3229 return notifier_from_errno(err);
3230 }
3231 }
3232 break;
3233
3234 case NETDEV_PRE_TYPE_CHANGE:
3235 case NETDEV_POST_TYPE_CHANGE:
3236 addrconf_type_change(dev, event);
3237 break;
3238 }
3239
3240 return NOTIFY_OK;
3241 }
3242
3243 /*
3244 * addrconf module should be notified of a device going up
3245 */
3246 static struct notifier_block ipv6_dev_notf = {
3247 .notifier_call = addrconf_notify,
3248 };
3249
3250 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3251 {
3252 struct inet6_dev *idev;
3253 ASSERT_RTNL();
3254
3255 idev = __in6_dev_get(dev);
3256
3257 if (event == NETDEV_POST_TYPE_CHANGE)
3258 ipv6_mc_remap(idev);
3259 else if (event == NETDEV_PRE_TYPE_CHANGE)
3260 ipv6_mc_unmap(idev);
3261 }
3262
3263 static int addrconf_ifdown(struct net_device *dev, int how)
3264 {
3265 struct net *net = dev_net(dev);
3266 struct inet6_dev *idev;
3267 struct inet6_ifaddr *ifa;
3268 int state, i;
3269
3270 ASSERT_RTNL();
3271
3272 rt6_ifdown(net, dev);
3273 neigh_ifdown(&nd_tbl, dev);
3274
3275 idev = __in6_dev_get(dev);
3276 if (!idev)
3277 return -ENODEV;
3278
3279 /*
3280 * Step 1: remove reference to ipv6 device from parent device.
3281 * Do not dev_put!
3282 */
3283 if (how) {
3284 idev->dead = 1;
3285
3286 /* protected by rtnl_lock */
3287 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3288
3289 /* Step 1.5: remove snmp6 entry */
3290 snmp6_unregister_dev(idev);
3291
3292 }
3293
3294 /* Step 2: clear hash table */
3295 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3296 struct hlist_head *h = &inet6_addr_lst[i];
3297
3298 spin_lock_bh(&addrconf_hash_lock);
3299 restart:
3300 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3301 if (ifa->idev == idev) {
3302 hlist_del_init_rcu(&ifa->addr_lst);
3303 addrconf_del_dad_work(ifa);
3304 goto restart;
3305 }
3306 }
3307 spin_unlock_bh(&addrconf_hash_lock);
3308 }
3309
3310 write_lock_bh(&idev->lock);
3311
3312 addrconf_del_rs_timer(idev);
3313
3314 /* Step 2: clear flags for stateless addrconf */
3315 if (!how)
3316 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3317
3318 if (how && del_timer(&idev->regen_timer))
3319 in6_dev_put(idev);
3320
3321 /* Step 3: clear tempaddr list */
3322 while (!list_empty(&idev->tempaddr_list)) {
3323 ifa = list_first_entry(&idev->tempaddr_list,
3324 struct inet6_ifaddr, tmp_list);
3325 list_del(&ifa->tmp_list);
3326 write_unlock_bh(&idev->lock);
3327 spin_lock_bh(&ifa->lock);
3328
3329 if (ifa->ifpub) {
3330 in6_ifa_put(ifa->ifpub);
3331 ifa->ifpub = NULL;
3332 }
3333 spin_unlock_bh(&ifa->lock);
3334 in6_ifa_put(ifa);
3335 write_lock_bh(&idev->lock);
3336 }
3337
3338 while (!list_empty(&idev->addr_list)) {
3339 ifa = list_first_entry(&idev->addr_list,
3340 struct inet6_ifaddr, if_list);
3341 addrconf_del_dad_work(ifa);
3342
3343 list_del(&ifa->if_list);
3344
3345 write_unlock_bh(&idev->lock);
3346
3347 spin_lock_bh(&ifa->lock);
3348 state = ifa->state;
3349 ifa->state = INET6_IFADDR_STATE_DEAD;
3350 spin_unlock_bh(&ifa->lock);
3351
3352 if (state != INET6_IFADDR_STATE_DEAD) {
3353 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3354 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3355 }
3356 in6_ifa_put(ifa);
3357
3358 write_lock_bh(&idev->lock);
3359 }
3360
3361 write_unlock_bh(&idev->lock);
3362
3363 /* Step 5: Discard anycast and multicast list */
3364 if (how) {
3365 ipv6_ac_destroy_dev(idev);
3366 ipv6_mc_destroy_dev(idev);
3367 } else {
3368 ipv6_mc_down(idev);
3369 }
3370
3371 idev->tstamp = jiffies;
3372
3373 /* Last: Shot the device (if unregistered) */
3374 if (how) {
3375 addrconf_sysctl_unregister(idev);
3376 neigh_parms_release(&nd_tbl, idev->nd_parms);
3377 neigh_ifdown(&nd_tbl, dev);
3378 in6_dev_put(idev);
3379 }
3380 return 0;
3381 }
3382
3383 static void addrconf_rs_timer(unsigned long data)
3384 {
3385 struct inet6_dev *idev = (struct inet6_dev *)data;
3386 struct net_device *dev = idev->dev;
3387 struct in6_addr lladdr;
3388
3389 write_lock(&idev->lock);
3390 if (idev->dead || !(idev->if_flags & IF_READY))
3391 goto out;
3392
3393 if (!ipv6_accept_ra(idev))
3394 goto out;
3395
3396 /* Announcement received after solicitation was sent */
3397 if (idev->if_flags & IF_RA_RCVD)
3398 goto out;
3399
3400 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3401 write_unlock(&idev->lock);
3402 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3403 ndisc_send_rs(dev, &lladdr,
3404 &in6addr_linklocal_allrouters);
3405 else
3406 goto put;
3407
3408 write_lock(&idev->lock);
3409 /* The wait after the last probe can be shorter */
3410 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3411 idev->cnf.rtr_solicits) ?
3412 idev->cnf.rtr_solicit_delay :
3413 idev->cnf.rtr_solicit_interval);
3414 } else {
3415 /*
3416 * Note: we do not support deprecated "all on-link"
3417 * assumption any longer.
3418 */
3419 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3420 }
3421
3422 out:
3423 write_unlock(&idev->lock);
3424 put:
3425 in6_dev_put(idev);
3426 }
3427
3428 /*
3429 * Duplicate Address Detection
3430 */
3431 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3432 {
3433 unsigned long rand_num;
3434 struct inet6_dev *idev = ifp->idev;
3435
3436 if (ifp->flags & IFA_F_OPTIMISTIC)
3437 rand_num = 0;
3438 else
3439 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3440
3441 ifp->dad_probes = idev->cnf.dad_transmits;
3442 addrconf_mod_dad_work(ifp, rand_num);
3443 }
3444
3445 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3446 {
3447 struct inet6_dev *idev = ifp->idev;
3448 struct net_device *dev = idev->dev;
3449
3450 addrconf_join_solict(dev, &ifp->addr);
3451
3452 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3453
3454 read_lock_bh(&idev->lock);
3455 spin_lock(&ifp->lock);
3456 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3457 goto out;
3458
3459 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3460 idev->cnf.accept_dad < 1 ||
3461 !(ifp->flags&IFA_F_TENTATIVE) ||
3462 ifp->flags & IFA_F_NODAD) {
3463 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3464 spin_unlock(&ifp->lock);
3465 read_unlock_bh(&idev->lock);
3466
3467 addrconf_dad_completed(ifp);
3468 return;
3469 }
3470
3471 if (!(idev->if_flags & IF_READY)) {
3472 spin_unlock(&ifp->lock);
3473 read_unlock_bh(&idev->lock);
3474 /*
3475 * If the device is not ready:
3476 * - keep it tentative if it is a permanent address.
3477 * - otherwise, kill it.
3478 */
3479 in6_ifa_hold(ifp);
3480 addrconf_dad_stop(ifp, 0);
3481 return;
3482 }
3483
3484 /*
3485 * Optimistic nodes can start receiving
3486 * Frames right away
3487 */
3488 if (ifp->flags & IFA_F_OPTIMISTIC) {
3489 ip6_ins_rt(ifp->rt);
3490 if (ipv6_use_optimistic_addr(idev)) {
3491 /* Because optimistic nodes can use this address,
3492 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3493 */
3494 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3495 }
3496 }
3497
3498 addrconf_dad_kick(ifp);
3499 out:
3500 spin_unlock(&ifp->lock);
3501 read_unlock_bh(&idev->lock);
3502 }
3503
3504 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3505 {
3506 bool begin_dad = false;
3507
3508 spin_lock_bh(&ifp->lock);
3509 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3510 ifp->state = INET6_IFADDR_STATE_PREDAD;
3511 begin_dad = true;
3512 }
3513 spin_unlock_bh(&ifp->lock);
3514
3515 if (begin_dad)
3516 addrconf_mod_dad_work(ifp, 0);
3517 }
3518
3519 static void addrconf_dad_work(struct work_struct *w)
3520 {
3521 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3522 struct inet6_ifaddr,
3523 dad_work);
3524 struct inet6_dev *idev = ifp->idev;
3525 struct in6_addr mcaddr;
3526
3527 enum {
3528 DAD_PROCESS,
3529 DAD_BEGIN,
3530 DAD_ABORT,
3531 } action = DAD_PROCESS;
3532
3533 rtnl_lock();
3534
3535 spin_lock_bh(&ifp->lock);
3536 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3537 action = DAD_BEGIN;
3538 ifp->state = INET6_IFADDR_STATE_DAD;
3539 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3540 action = DAD_ABORT;
3541 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3542 }
3543 spin_unlock_bh(&ifp->lock);
3544
3545 if (action == DAD_BEGIN) {
3546 addrconf_dad_begin(ifp);
3547 goto out;
3548 } else if (action == DAD_ABORT) {
3549 addrconf_dad_stop(ifp, 1);
3550 goto out;
3551 }
3552
3553 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3554 goto out;
3555
3556 write_lock_bh(&idev->lock);
3557 if (idev->dead || !(idev->if_flags & IF_READY)) {
3558 write_unlock_bh(&idev->lock);
3559 goto out;
3560 }
3561
3562 spin_lock(&ifp->lock);
3563 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3564 spin_unlock(&ifp->lock);
3565 write_unlock_bh(&idev->lock);
3566 goto out;
3567 }
3568
3569 if (ifp->dad_probes == 0) {
3570 /*
3571 * DAD was successful
3572 */
3573
3574 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3575 spin_unlock(&ifp->lock);
3576 write_unlock_bh(&idev->lock);
3577
3578 addrconf_dad_completed(ifp);
3579
3580 goto out;
3581 }
3582
3583 ifp->dad_probes--;
3584 addrconf_mod_dad_work(ifp,
3585 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3586 spin_unlock(&ifp->lock);
3587 write_unlock_bh(&idev->lock);
3588
3589 /* send a neighbour solicitation for our addr */
3590 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3591 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3592 out:
3593 in6_ifa_put(ifp);
3594 rtnl_unlock();
3595 }
3596
3597 /* ifp->idev must be at least read locked */
3598 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3599 {
3600 struct inet6_ifaddr *ifpiter;
3601 struct inet6_dev *idev = ifp->idev;
3602
3603 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3604 if (ifpiter->scope > IFA_LINK)
3605 break;
3606 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3607 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3608 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3609 IFA_F_PERMANENT)
3610 return false;
3611 }
3612 return true;
3613 }
3614
3615 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3616 {
3617 struct net_device *dev = ifp->idev->dev;
3618 struct in6_addr lladdr;
3619 bool send_rs, send_mld;
3620
3621 addrconf_del_dad_work(ifp);
3622
3623 /*
3624 * Configure the address for reception. Now it is valid.
3625 */
3626
3627 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3628
3629 /* If added prefix is link local and we are prepared to process
3630 router advertisements, start sending router solicitations.
3631 */
3632
3633 read_lock_bh(&ifp->idev->lock);
3634 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3635 send_rs = send_mld &&
3636 ipv6_accept_ra(ifp->idev) &&
3637 ifp->idev->cnf.rtr_solicits > 0 &&
3638 (dev->flags&IFF_LOOPBACK) == 0;
3639 read_unlock_bh(&ifp->idev->lock);
3640
3641 /* While dad is in progress mld report's source address is in6_addrany.
3642 * Resend with proper ll now.
3643 */
3644 if (send_mld)
3645 ipv6_mc_dad_complete(ifp->idev);
3646
3647 if (send_rs) {
3648 /*
3649 * If a host as already performed a random delay
3650 * [...] as part of DAD [...] there is no need
3651 * to delay again before sending the first RS
3652 */
3653 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3654 return;
3655 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3656
3657 write_lock_bh(&ifp->idev->lock);
3658 spin_lock(&ifp->lock);
3659 ifp->idev->rs_probes = 1;
3660 ifp->idev->if_flags |= IF_RS_SENT;
3661 addrconf_mod_rs_timer(ifp->idev,
3662 ifp->idev->cnf.rtr_solicit_interval);
3663 spin_unlock(&ifp->lock);
3664 write_unlock_bh(&ifp->idev->lock);
3665 }
3666 }
3667
3668 static void addrconf_dad_run(struct inet6_dev *idev)
3669 {
3670 struct inet6_ifaddr *ifp;
3671
3672 read_lock_bh(&idev->lock);
3673 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3674 spin_lock(&ifp->lock);
3675 if (ifp->flags & IFA_F_TENTATIVE &&
3676 ifp->state == INET6_IFADDR_STATE_DAD)
3677 addrconf_dad_kick(ifp);
3678 spin_unlock(&ifp->lock);
3679 }
3680 read_unlock_bh(&idev->lock);
3681 }
3682
3683 #ifdef CONFIG_PROC_FS
3684 struct if6_iter_state {
3685 struct seq_net_private p;
3686 int bucket;
3687 int offset;
3688 };
3689
3690 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3691 {
3692 struct inet6_ifaddr *ifa = NULL;
3693 struct if6_iter_state *state = seq->private;
3694 struct net *net = seq_file_net(seq);
3695 int p = 0;
3696
3697 /* initial bucket if pos is 0 */
3698 if (pos == 0) {
3699 state->bucket = 0;
3700 state->offset = 0;
3701 }
3702
3703 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3704 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3705 addr_lst) {
3706 if (!net_eq(dev_net(ifa->idev->dev), net))
3707 continue;
3708 /* sync with offset */
3709 if (p < state->offset) {
3710 p++;
3711 continue;
3712 }
3713 state->offset++;
3714 return ifa;
3715 }
3716
3717 /* prepare for next bucket */
3718 state->offset = 0;
3719 p = 0;
3720 }
3721 return NULL;
3722 }
3723
3724 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3725 struct inet6_ifaddr *ifa)
3726 {
3727 struct if6_iter_state *state = seq->private;
3728 struct net *net = seq_file_net(seq);
3729
3730 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3731 if (!net_eq(dev_net(ifa->idev->dev), net))
3732 continue;
3733 state->offset++;
3734 return ifa;
3735 }
3736
3737 while (++state->bucket < IN6_ADDR_HSIZE) {
3738 state->offset = 0;
3739 hlist_for_each_entry_rcu_bh(ifa,
3740 &inet6_addr_lst[state->bucket], addr_lst) {
3741 if (!net_eq(dev_net(ifa->idev->dev), net))
3742 continue;
3743 state->offset++;
3744 return ifa;
3745 }
3746 }
3747
3748 return NULL;
3749 }
3750
3751 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3752 __acquires(rcu_bh)
3753 {
3754 rcu_read_lock_bh();
3755 return if6_get_first(seq, *pos);
3756 }
3757
3758 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3759 {
3760 struct inet6_ifaddr *ifa;
3761
3762 ifa = if6_get_next(seq, v);
3763 ++*pos;
3764 return ifa;
3765 }
3766
3767 static void if6_seq_stop(struct seq_file *seq, void *v)
3768 __releases(rcu_bh)
3769 {
3770 rcu_read_unlock_bh();
3771 }
3772
3773 static int if6_seq_show(struct seq_file *seq, void *v)
3774 {
3775 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3776 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3777 &ifp->addr,
3778 ifp->idev->dev->ifindex,
3779 ifp->prefix_len,
3780 ifp->scope,
3781 (u8) ifp->flags,
3782 ifp->idev->dev->name);
3783 return 0;
3784 }
3785
3786 static const struct seq_operations if6_seq_ops = {
3787 .start = if6_seq_start,
3788 .next = if6_seq_next,
3789 .show = if6_seq_show,
3790 .stop = if6_seq_stop,
3791 };
3792
3793 static int if6_seq_open(struct inode *inode, struct file *file)
3794 {
3795 return seq_open_net(inode, file, &if6_seq_ops,
3796 sizeof(struct if6_iter_state));
3797 }
3798
3799 static const struct file_operations if6_fops = {
3800 .owner = THIS_MODULE,
3801 .open = if6_seq_open,
3802 .read = seq_read,
3803 .llseek = seq_lseek,
3804 .release = seq_release_net,
3805 };
3806
3807 static int __net_init if6_proc_net_init(struct net *net)
3808 {
3809 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3810 return -ENOMEM;
3811 return 0;
3812 }
3813
3814 static void __net_exit if6_proc_net_exit(struct net *net)
3815 {
3816 remove_proc_entry("if_inet6", net->proc_net);
3817 }
3818
3819 static struct pernet_operations if6_proc_net_ops = {
3820 .init = if6_proc_net_init,
3821 .exit = if6_proc_net_exit,
3822 };
3823
3824 int __init if6_proc_init(void)
3825 {
3826 return register_pernet_subsys(&if6_proc_net_ops);
3827 }
3828
3829 void if6_proc_exit(void)
3830 {
3831 unregister_pernet_subsys(&if6_proc_net_ops);
3832 }
3833 #endif /* CONFIG_PROC_FS */
3834
3835 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3836 /* Check if address is a home address configured on any interface. */
3837 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3838 {
3839 int ret = 0;
3840 struct inet6_ifaddr *ifp = NULL;
3841 unsigned int hash = inet6_addr_hash(addr);
3842
3843 rcu_read_lock_bh();
3844 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3845 if (!net_eq(dev_net(ifp->idev->dev), net))
3846 continue;
3847 if (ipv6_addr_equal(&ifp->addr, addr) &&
3848 (ifp->flags & IFA_F_HOMEADDRESS)) {
3849 ret = 1;
3850 break;
3851 }
3852 }
3853 rcu_read_unlock_bh();
3854 return ret;
3855 }
3856 #endif
3857
3858 /*
3859 * Periodic address status verification
3860 */
3861
3862 static void addrconf_verify_rtnl(void)
3863 {
3864 unsigned long now, next, next_sec, next_sched;
3865 struct inet6_ifaddr *ifp;
3866 int i;
3867
3868 ASSERT_RTNL();
3869
3870 rcu_read_lock_bh();
3871 now = jiffies;
3872 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3873
3874 cancel_delayed_work(&addr_chk_work);
3875
3876 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3877 restart:
3878 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3879 unsigned long age;
3880
3881 /* When setting preferred_lft to a value not zero or
3882 * infinity, while valid_lft is infinity
3883 * IFA_F_PERMANENT has a non-infinity life time.
3884 */
3885 if ((ifp->flags & IFA_F_PERMANENT) &&
3886 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3887 continue;
3888
3889 spin_lock(&ifp->lock);
3890 /* We try to batch several events at once. */
3891 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3892
3893 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3894 age >= ifp->valid_lft) {
3895 spin_unlock(&ifp->lock);
3896 in6_ifa_hold(ifp);
3897 ipv6_del_addr(ifp);
3898 goto restart;
3899 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3900 spin_unlock(&ifp->lock);
3901 continue;
3902 } else if (age >= ifp->prefered_lft) {
3903 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3904 int deprecate = 0;
3905
3906 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3907 deprecate = 1;
3908 ifp->flags |= IFA_F_DEPRECATED;
3909 }
3910
3911 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3912 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3913 next = ifp->tstamp + ifp->valid_lft * HZ;
3914
3915 spin_unlock(&ifp->lock);
3916
3917 if (deprecate) {
3918 in6_ifa_hold(ifp);
3919
3920 ipv6_ifa_notify(0, ifp);
3921 in6_ifa_put(ifp);
3922 goto restart;
3923 }
3924 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3925 !(ifp->flags&IFA_F_TENTATIVE)) {
3926 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3927 ifp->idev->cnf.dad_transmits *
3928 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3929
3930 if (age >= ifp->prefered_lft - regen_advance) {
3931 struct inet6_ifaddr *ifpub = ifp->ifpub;
3932 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3933 next = ifp->tstamp + ifp->prefered_lft * HZ;
3934 if (!ifp->regen_count && ifpub) {
3935 ifp->regen_count++;
3936 in6_ifa_hold(ifp);
3937 in6_ifa_hold(ifpub);
3938 spin_unlock(&ifp->lock);
3939
3940 spin_lock(&ifpub->lock);
3941 ifpub->regen_count = 0;
3942 spin_unlock(&ifpub->lock);
3943 ipv6_create_tempaddr(ifpub, ifp);
3944 in6_ifa_put(ifpub);
3945 in6_ifa_put(ifp);
3946 goto restart;
3947 }
3948 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3949 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3950 spin_unlock(&ifp->lock);
3951 } else {
3952 /* ifp->prefered_lft <= ifp->valid_lft */
3953 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3954 next = ifp->tstamp + ifp->prefered_lft * HZ;
3955 spin_unlock(&ifp->lock);
3956 }
3957 }
3958 }
3959
3960 next_sec = round_jiffies_up(next);
3961 next_sched = next;
3962
3963 /* If rounded timeout is accurate enough, accept it. */
3964 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3965 next_sched = next_sec;
3966
3967 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3968 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3969 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3970
3971 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3972 now, next, next_sec, next_sched);
3973 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
3974 rcu_read_unlock_bh();
3975 }
3976
3977 static void addrconf_verify_work(struct work_struct *w)
3978 {
3979 rtnl_lock();
3980 addrconf_verify_rtnl();
3981 rtnl_unlock();
3982 }
3983
3984 static void addrconf_verify(void)
3985 {
3986 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3987 }
3988
3989 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3990 struct in6_addr **peer_pfx)
3991 {
3992 struct in6_addr *pfx = NULL;
3993
3994 *peer_pfx = NULL;
3995
3996 if (addr)
3997 pfx = nla_data(addr);
3998
3999 if (local) {
4000 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4001 *peer_pfx = pfx;
4002 pfx = nla_data(local);
4003 }
4004
4005 return pfx;
4006 }
4007
4008 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4009 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4010 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4011 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4012 [IFA_FLAGS] = { .len = sizeof(u32) },
4013 };
4014
4015 static int
4016 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4017 {
4018 struct net *net = sock_net(skb->sk);
4019 struct ifaddrmsg *ifm;
4020 struct nlattr *tb[IFA_MAX+1];
4021 struct in6_addr *pfx, *peer_pfx;
4022 u32 ifa_flags;
4023 int err;
4024
4025 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4026 if (err < 0)
4027 return err;
4028
4029 ifm = nlmsg_data(nlh);
4030 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4031 if (!pfx)
4032 return -EINVAL;
4033
4034 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4035
4036 /* We ignore other flags so far. */
4037 ifa_flags &= IFA_F_MANAGETEMPADDR;
4038
4039 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4040 ifm->ifa_prefixlen);
4041 }
4042
4043 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4044 u32 prefered_lft, u32 valid_lft)
4045 {
4046 u32 flags;
4047 clock_t expires;
4048 unsigned long timeout;
4049 bool was_managetempaddr;
4050 bool had_prefixroute;
4051
4052 ASSERT_RTNL();
4053
4054 if (!valid_lft || (prefered_lft > valid_lft))
4055 return -EINVAL;
4056
4057 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4058 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4059 return -EINVAL;
4060
4061 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4062 if (addrconf_finite_timeout(timeout)) {
4063 expires = jiffies_to_clock_t(timeout * HZ);
4064 valid_lft = timeout;
4065 flags = RTF_EXPIRES;
4066 } else {
4067 expires = 0;
4068 flags = 0;
4069 ifa_flags |= IFA_F_PERMANENT;
4070 }
4071
4072 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4073 if (addrconf_finite_timeout(timeout)) {
4074 if (timeout == 0)
4075 ifa_flags |= IFA_F_DEPRECATED;
4076 prefered_lft = timeout;
4077 }
4078
4079 spin_lock_bh(&ifp->lock);
4080 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4081 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4082 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4083 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4084 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4085 IFA_F_NOPREFIXROUTE);
4086 ifp->flags |= ifa_flags;
4087 ifp->tstamp = jiffies;
4088 ifp->valid_lft = valid_lft;
4089 ifp->prefered_lft = prefered_lft;
4090
4091 spin_unlock_bh(&ifp->lock);
4092 if (!(ifp->flags&IFA_F_TENTATIVE))
4093 ipv6_ifa_notify(0, ifp);
4094
4095 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4096 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4097 expires, flags);
4098 } else if (had_prefixroute) {
4099 enum cleanup_prefix_rt_t action;
4100 unsigned long rt_expires;
4101
4102 write_lock_bh(&ifp->idev->lock);
4103 action = check_cleanup_prefix_route(ifp, &rt_expires);
4104 write_unlock_bh(&ifp->idev->lock);
4105
4106 if (action != CLEANUP_PREFIX_RT_NOP) {
4107 cleanup_prefix_route(ifp, rt_expires,
4108 action == CLEANUP_PREFIX_RT_DEL);
4109 }
4110 }
4111
4112 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4113 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4114 valid_lft = prefered_lft = 0;
4115 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4116 !was_managetempaddr, jiffies);
4117 }
4118
4119 addrconf_verify_rtnl();
4120
4121 return 0;
4122 }
4123
4124 static int
4125 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4126 {
4127 struct net *net = sock_net(skb->sk);
4128 struct ifaddrmsg *ifm;
4129 struct nlattr *tb[IFA_MAX+1];
4130 struct in6_addr *pfx, *peer_pfx;
4131 struct inet6_ifaddr *ifa;
4132 struct net_device *dev;
4133 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4134 u32 ifa_flags;
4135 int err;
4136
4137 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4138 if (err < 0)
4139 return err;
4140
4141 ifm = nlmsg_data(nlh);
4142 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4143 if (!pfx)
4144 return -EINVAL;
4145
4146 if (tb[IFA_CACHEINFO]) {
4147 struct ifa_cacheinfo *ci;
4148
4149 ci = nla_data(tb[IFA_CACHEINFO]);
4150 valid_lft = ci->ifa_valid;
4151 preferred_lft = ci->ifa_prefered;
4152 } else {
4153 preferred_lft = INFINITY_LIFE_TIME;
4154 valid_lft = INFINITY_LIFE_TIME;
4155 }
4156
4157 dev = __dev_get_by_index(net, ifm->ifa_index);
4158 if (!dev)
4159 return -ENODEV;
4160
4161 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4162
4163 /* We ignore other flags so far. */
4164 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4165 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4166
4167 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4168 if (!ifa) {
4169 /*
4170 * It would be best to check for !NLM_F_CREATE here but
4171 * userspace already relies on not having to provide this.
4172 */
4173 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4174 ifm->ifa_prefixlen, ifa_flags,
4175 preferred_lft, valid_lft);
4176 }
4177
4178 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4179 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4180 err = -EEXIST;
4181 else
4182 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4183
4184 in6_ifa_put(ifa);
4185
4186 return err;
4187 }
4188
4189 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4190 u8 scope, int ifindex)
4191 {
4192 struct ifaddrmsg *ifm;
4193
4194 ifm = nlmsg_data(nlh);
4195 ifm->ifa_family = AF_INET6;
4196 ifm->ifa_prefixlen = prefixlen;
4197 ifm->ifa_flags = flags;
4198 ifm->ifa_scope = scope;
4199 ifm->ifa_index = ifindex;
4200 }
4201
4202 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4203 unsigned long tstamp, u32 preferred, u32 valid)
4204 {
4205 struct ifa_cacheinfo ci;
4206
4207 ci.cstamp = cstamp_delta(cstamp);
4208 ci.tstamp = cstamp_delta(tstamp);
4209 ci.ifa_prefered = preferred;
4210 ci.ifa_valid = valid;
4211
4212 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4213 }
4214
4215 static inline int rt_scope(int ifa_scope)
4216 {
4217 if (ifa_scope & IFA_HOST)
4218 return RT_SCOPE_HOST;
4219 else if (ifa_scope & IFA_LINK)
4220 return RT_SCOPE_LINK;
4221 else if (ifa_scope & IFA_SITE)
4222 return RT_SCOPE_SITE;
4223 else
4224 return RT_SCOPE_UNIVERSE;
4225 }
4226
4227 static inline int inet6_ifaddr_msgsize(void)
4228 {
4229 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4230 + nla_total_size(16) /* IFA_LOCAL */
4231 + nla_total_size(16) /* IFA_ADDRESS */
4232 + nla_total_size(sizeof(struct ifa_cacheinfo))
4233 + nla_total_size(4) /* IFA_FLAGS */;
4234 }
4235
4236 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4237 u32 portid, u32 seq, int event, unsigned int flags)
4238 {
4239 struct nlmsghdr *nlh;
4240 u32 preferred, valid;
4241
4242 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4243 if (!nlh)
4244 return -EMSGSIZE;
4245
4246 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4247 ifa->idev->dev->ifindex);
4248
4249 if (!((ifa->flags&IFA_F_PERMANENT) &&
4250 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4251 preferred = ifa->prefered_lft;
4252 valid = ifa->valid_lft;
4253 if (preferred != INFINITY_LIFE_TIME) {
4254 long tval = (jiffies - ifa->tstamp)/HZ;
4255 if (preferred > tval)
4256 preferred -= tval;
4257 else
4258 preferred = 0;
4259 if (valid != INFINITY_LIFE_TIME) {
4260 if (valid > tval)
4261 valid -= tval;
4262 else
4263 valid = 0;
4264 }
4265 }
4266 } else {
4267 preferred = INFINITY_LIFE_TIME;
4268 valid = INFINITY_LIFE_TIME;
4269 }
4270
4271 if (!ipv6_addr_any(&ifa->peer_addr)) {
4272 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4273 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4274 goto error;
4275 } else
4276 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4277 goto error;
4278
4279 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4280 goto error;
4281
4282 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4283 goto error;
4284
4285 nlmsg_end(skb, nlh);
4286 return 0;
4287
4288 error:
4289 nlmsg_cancel(skb, nlh);
4290 return -EMSGSIZE;
4291 }
4292
4293 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4294 u32 portid, u32 seq, int event, u16 flags)
4295 {
4296 struct nlmsghdr *nlh;
4297 u8 scope = RT_SCOPE_UNIVERSE;
4298 int ifindex = ifmca->idev->dev->ifindex;
4299
4300 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4301 scope = RT_SCOPE_SITE;
4302
4303 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4304 if (!nlh)
4305 return -EMSGSIZE;
4306
4307 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4308 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4309 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4310 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4311 nlmsg_cancel(skb, nlh);
4312 return -EMSGSIZE;
4313 }
4314
4315 nlmsg_end(skb, nlh);
4316 return 0;
4317 }
4318
4319 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4320 u32 portid, u32 seq, int event, unsigned int flags)
4321 {
4322 struct nlmsghdr *nlh;
4323 u8 scope = RT_SCOPE_UNIVERSE;
4324 int ifindex = ifaca->aca_idev->dev->ifindex;
4325
4326 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4327 scope = RT_SCOPE_SITE;
4328
4329 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4330 if (!nlh)
4331 return -EMSGSIZE;
4332
4333 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4334 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4335 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4336 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4337 nlmsg_cancel(skb, nlh);
4338 return -EMSGSIZE;
4339 }
4340
4341 nlmsg_end(skb, nlh);
4342 return 0;
4343 }
4344
4345 enum addr_type_t {
4346 UNICAST_ADDR,
4347 MULTICAST_ADDR,
4348 ANYCAST_ADDR,
4349 };
4350
4351 /* called with rcu_read_lock() */
4352 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4353 struct netlink_callback *cb, enum addr_type_t type,
4354 int s_ip_idx, int *p_ip_idx)
4355 {
4356 struct ifmcaddr6 *ifmca;
4357 struct ifacaddr6 *ifaca;
4358 int err = 1;
4359 int ip_idx = *p_ip_idx;
4360
4361 read_lock_bh(&idev->lock);
4362 switch (type) {
4363 case UNICAST_ADDR: {
4364 struct inet6_ifaddr *ifa;
4365
4366 /* unicast address incl. temp addr */
4367 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4368 if (++ip_idx < s_ip_idx)
4369 continue;
4370 err = inet6_fill_ifaddr(skb, ifa,
4371 NETLINK_CB(cb->skb).portid,
4372 cb->nlh->nlmsg_seq,
4373 RTM_NEWADDR,
4374 NLM_F_MULTI);
4375 if (err < 0)
4376 break;
4377 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4378 }
4379 break;
4380 }
4381 case MULTICAST_ADDR:
4382 /* multicast address */
4383 for (ifmca = idev->mc_list; ifmca;
4384 ifmca = ifmca->next, ip_idx++) {
4385 if (ip_idx < s_ip_idx)
4386 continue;
4387 err = inet6_fill_ifmcaddr(skb, ifmca,
4388 NETLINK_CB(cb->skb).portid,
4389 cb->nlh->nlmsg_seq,
4390 RTM_GETMULTICAST,
4391 NLM_F_MULTI);
4392 if (err < 0)
4393 break;
4394 }
4395 break;
4396 case ANYCAST_ADDR:
4397 /* anycast address */
4398 for (ifaca = idev->ac_list; ifaca;
4399 ifaca = ifaca->aca_next, ip_idx++) {
4400 if (ip_idx < s_ip_idx)
4401 continue;
4402 err = inet6_fill_ifacaddr(skb, ifaca,
4403 NETLINK_CB(cb->skb).portid,
4404 cb->nlh->nlmsg_seq,
4405 RTM_GETANYCAST,
4406 NLM_F_MULTI);
4407 if (err < 0)
4408 break;
4409 }
4410 break;
4411 default:
4412 break;
4413 }
4414 read_unlock_bh(&idev->lock);
4415 *p_ip_idx = ip_idx;
4416 return err;
4417 }
4418
4419 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4420 enum addr_type_t type)
4421 {
4422 struct net *net = sock_net(skb->sk);
4423 int h, s_h;
4424 int idx, ip_idx;
4425 int s_idx, s_ip_idx;
4426 struct net_device *dev;
4427 struct inet6_dev *idev;
4428 struct hlist_head *head;
4429
4430 s_h = cb->args[0];
4431 s_idx = idx = cb->args[1];
4432 s_ip_idx = ip_idx = cb->args[2];
4433
4434 rcu_read_lock();
4435 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4436 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4437 idx = 0;
4438 head = &net->dev_index_head[h];
4439 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4440 if (idx < s_idx)
4441 goto cont;
4442 if (h > s_h || idx > s_idx)
4443 s_ip_idx = 0;
4444 ip_idx = 0;
4445 idev = __in6_dev_get(dev);
4446 if (!idev)
4447 goto cont;
4448
4449 if (in6_dump_addrs(idev, skb, cb, type,
4450 s_ip_idx, &ip_idx) < 0)
4451 goto done;
4452 cont:
4453 idx++;
4454 }
4455 }
4456 done:
4457 rcu_read_unlock();
4458 cb->args[0] = h;
4459 cb->args[1] = idx;
4460 cb->args[2] = ip_idx;
4461
4462 return skb->len;
4463 }
4464
4465 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4466 {
4467 enum addr_type_t type = UNICAST_ADDR;
4468
4469 return inet6_dump_addr(skb, cb, type);
4470 }
4471
4472 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4473 {
4474 enum addr_type_t type = MULTICAST_ADDR;
4475
4476 return inet6_dump_addr(skb, cb, type);
4477 }
4478
4479
4480 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4481 {
4482 enum addr_type_t type = ANYCAST_ADDR;
4483
4484 return inet6_dump_addr(skb, cb, type);
4485 }
4486
4487 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4488 {
4489 struct net *net = sock_net(in_skb->sk);
4490 struct ifaddrmsg *ifm;
4491 struct nlattr *tb[IFA_MAX+1];
4492 struct in6_addr *addr = NULL, *peer;
4493 struct net_device *dev = NULL;
4494 struct inet6_ifaddr *ifa;
4495 struct sk_buff *skb;
4496 int err;
4497
4498 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4499 if (err < 0)
4500 goto errout;
4501
4502 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4503 if (!addr) {
4504 err = -EINVAL;
4505 goto errout;
4506 }
4507
4508 ifm = nlmsg_data(nlh);
4509 if (ifm->ifa_index)
4510 dev = __dev_get_by_index(net, ifm->ifa_index);
4511
4512 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4513 if (!ifa) {
4514 err = -EADDRNOTAVAIL;
4515 goto errout;
4516 }
4517
4518 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4519 if (!skb) {
4520 err = -ENOBUFS;
4521 goto errout_ifa;
4522 }
4523
4524 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4525 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4526 if (err < 0) {
4527 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4528 WARN_ON(err == -EMSGSIZE);
4529 kfree_skb(skb);
4530 goto errout_ifa;
4531 }
4532 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4533 errout_ifa:
4534 in6_ifa_put(ifa);
4535 errout:
4536 return err;
4537 }
4538
4539 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4540 {
4541 struct sk_buff *skb;
4542 struct net *net = dev_net(ifa->idev->dev);
4543 int err = -ENOBUFS;
4544
4545 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4546 if (!skb)
4547 goto errout;
4548
4549 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4550 if (err < 0) {
4551 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4552 WARN_ON(err == -EMSGSIZE);
4553 kfree_skb(skb);
4554 goto errout;
4555 }
4556 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4557 return;
4558 errout:
4559 if (err < 0)
4560 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4561 }
4562
4563 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4564 __s32 *array, int bytes)
4565 {
4566 BUG_ON(bytes < (DEVCONF_MAX * 4));
4567
4568 memset(array, 0, bytes);
4569 array[DEVCONF_FORWARDING] = cnf->forwarding;
4570 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4571 array[DEVCONF_MTU6] = cnf->mtu6;
4572 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4573 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4574 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4575 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4576 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4577 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4578 jiffies_to_msecs(cnf->rtr_solicit_interval);
4579 array[DEVCONF_RTR_SOLICIT_DELAY] =
4580 jiffies_to_msecs(cnf->rtr_solicit_delay);
4581 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4582 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4583 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4584 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4585 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4586 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4587 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4588 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4589 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4590 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4591 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4592 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4593 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4594 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4595 #ifdef CONFIG_IPV6_ROUTER_PREF
4596 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4597 array[DEVCONF_RTR_PROBE_INTERVAL] =
4598 jiffies_to_msecs(cnf->rtr_probe_interval);
4599 #ifdef CONFIG_IPV6_ROUTE_INFO
4600 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4601 #endif
4602 #endif
4603 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4604 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4605 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4606 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4607 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4608 #endif
4609 #ifdef CONFIG_IPV6_MROUTE
4610 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4611 #endif
4612 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4613 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4614 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4615 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4616 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4617 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4618 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4619 /* we omit DEVCONF_STABLE_SECRET for now */
4620 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4621 }
4622
4623 static inline size_t inet6_ifla6_size(void)
4624 {
4625 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4626 + nla_total_size(sizeof(struct ifla_cacheinfo))
4627 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4628 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4629 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4630 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4631 }
4632
4633 static inline size_t inet6_if_nlmsg_size(void)
4634 {
4635 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4636 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4637 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4638 + nla_total_size(4) /* IFLA_MTU */
4639 + nla_total_size(4) /* IFLA_LINK */
4640 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4641 }
4642
4643 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4644 int items, int bytes)
4645 {
4646 int i;
4647 int pad = bytes - sizeof(u64) * items;
4648 BUG_ON(pad < 0);
4649
4650 /* Use put_unaligned() because stats may not be aligned for u64. */
4651 put_unaligned(items, &stats[0]);
4652 for (i = 1; i < items; i++)
4653 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4654
4655 memset(&stats[items], 0, pad);
4656 }
4657
4658 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4659 int items, int bytes, size_t syncpoff)
4660 {
4661 int i;
4662 int pad = bytes - sizeof(u64) * items;
4663 BUG_ON(pad < 0);
4664
4665 /* Use put_unaligned() because stats may not be aligned for u64. */
4666 put_unaligned(items, &stats[0]);
4667 for (i = 1; i < items; i++)
4668 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4669
4670 memset(&stats[items], 0, pad);
4671 }
4672
4673 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4674 int bytes)
4675 {
4676 switch (attrtype) {
4677 case IFLA_INET6_STATS:
4678 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4679 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4680 break;
4681 case IFLA_INET6_ICMP6STATS:
4682 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4683 break;
4684 }
4685 }
4686
4687 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4688 {
4689 struct nlattr *nla;
4690 struct ifla_cacheinfo ci;
4691
4692 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4693 goto nla_put_failure;
4694 ci.max_reasm_len = IPV6_MAXPLEN;
4695 ci.tstamp = cstamp_delta(idev->tstamp);
4696 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4697 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4698 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4699 goto nla_put_failure;
4700 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4701 if (!nla)
4702 goto nla_put_failure;
4703 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4704
4705 /* XXX - MC not implemented */
4706
4707 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4708 if (!nla)
4709 goto nla_put_failure;
4710 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4711
4712 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4713 if (!nla)
4714 goto nla_put_failure;
4715 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4716
4717 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4718 if (!nla)
4719 goto nla_put_failure;
4720
4721 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4722 goto nla_put_failure;
4723
4724 read_lock_bh(&idev->lock);
4725 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4726 read_unlock_bh(&idev->lock);
4727
4728 return 0;
4729
4730 nla_put_failure:
4731 return -EMSGSIZE;
4732 }
4733
4734 static size_t inet6_get_link_af_size(const struct net_device *dev)
4735 {
4736 if (!__in6_dev_get(dev))
4737 return 0;
4738
4739 return inet6_ifla6_size();
4740 }
4741
4742 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4743 {
4744 struct inet6_dev *idev = __in6_dev_get(dev);
4745
4746 if (!idev)
4747 return -ENODATA;
4748
4749 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4750 return -EMSGSIZE;
4751
4752 return 0;
4753 }
4754
4755 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4756 {
4757 struct inet6_ifaddr *ifp;
4758 struct net_device *dev = idev->dev;
4759 bool update_rs = false;
4760 struct in6_addr ll_addr;
4761
4762 ASSERT_RTNL();
4763
4764 if (!token)
4765 return -EINVAL;
4766 if (ipv6_addr_any(token))
4767 return -EINVAL;
4768 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4769 return -EINVAL;
4770 if (!ipv6_accept_ra(idev))
4771 return -EINVAL;
4772 if (idev->cnf.rtr_solicits <= 0)
4773 return -EINVAL;
4774
4775 write_lock_bh(&idev->lock);
4776
4777 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4778 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4779
4780 write_unlock_bh(&idev->lock);
4781
4782 if (!idev->dead && (idev->if_flags & IF_READY) &&
4783 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4784 IFA_F_OPTIMISTIC)) {
4785
4786 /* If we're not ready, then normal ifup will take care
4787 * of this. Otherwise, we need to request our rs here.
4788 */
4789 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4790 update_rs = true;
4791 }
4792
4793 write_lock_bh(&idev->lock);
4794
4795 if (update_rs) {
4796 idev->if_flags |= IF_RS_SENT;
4797 idev->rs_probes = 1;
4798 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4799 }
4800
4801 /* Well, that's kinda nasty ... */
4802 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4803 spin_lock(&ifp->lock);
4804 if (ifp->tokenized) {
4805 ifp->valid_lft = 0;
4806 ifp->prefered_lft = 0;
4807 }
4808 spin_unlock(&ifp->lock);
4809 }
4810
4811 write_unlock_bh(&idev->lock);
4812 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4813 addrconf_verify_rtnl();
4814 return 0;
4815 }
4816
4817 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4818 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4819 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4820 };
4821
4822 static int inet6_validate_link_af(const struct net_device *dev,
4823 const struct nlattr *nla)
4824 {
4825 struct nlattr *tb[IFLA_INET6_MAX + 1];
4826
4827 if (dev && !__in6_dev_get(dev))
4828 return -EAFNOSUPPORT;
4829
4830 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4831 }
4832
4833 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4834 {
4835 int err = -EINVAL;
4836 struct inet6_dev *idev = __in6_dev_get(dev);
4837 struct nlattr *tb[IFLA_INET6_MAX + 1];
4838
4839 if (!idev)
4840 return -EAFNOSUPPORT;
4841
4842 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4843 BUG();
4844
4845 if (tb[IFLA_INET6_TOKEN]) {
4846 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4847 if (err)
4848 return err;
4849 }
4850
4851 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4852 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4853
4854 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4855 mode != IN6_ADDR_GEN_MODE_NONE &&
4856 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4857 return -EINVAL;
4858
4859 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4860 !idev->cnf.stable_secret.initialized &&
4861 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4862 return -EINVAL;
4863
4864 idev->addr_gen_mode = mode;
4865 err = 0;
4866 }
4867
4868 return err;
4869 }
4870
4871 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4872 u32 portid, u32 seq, int event, unsigned int flags)
4873 {
4874 struct net_device *dev = idev->dev;
4875 struct ifinfomsg *hdr;
4876 struct nlmsghdr *nlh;
4877 void *protoinfo;
4878
4879 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4880 if (!nlh)
4881 return -EMSGSIZE;
4882
4883 hdr = nlmsg_data(nlh);
4884 hdr->ifi_family = AF_INET6;
4885 hdr->__ifi_pad = 0;
4886 hdr->ifi_type = dev->type;
4887 hdr->ifi_index = dev->ifindex;
4888 hdr->ifi_flags = dev_get_flags(dev);
4889 hdr->ifi_change = 0;
4890
4891 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4892 (dev->addr_len &&
4893 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4894 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4895 (dev->ifindex != dev_get_iflink(dev) &&
4896 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4897 goto nla_put_failure;
4898 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4899 if (!protoinfo)
4900 goto nla_put_failure;
4901
4902 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4903 goto nla_put_failure;
4904
4905 nla_nest_end(skb, protoinfo);
4906 nlmsg_end(skb, nlh);
4907 return 0;
4908
4909 nla_put_failure:
4910 nlmsg_cancel(skb, nlh);
4911 return -EMSGSIZE;
4912 }
4913
4914 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4915 {
4916 struct net *net = sock_net(skb->sk);
4917 int h, s_h;
4918 int idx = 0, s_idx;
4919 struct net_device *dev;
4920 struct inet6_dev *idev;
4921 struct hlist_head *head;
4922
4923 s_h = cb->args[0];
4924 s_idx = cb->args[1];
4925
4926 rcu_read_lock();
4927 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4928 idx = 0;
4929 head = &net->dev_index_head[h];
4930 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4931 if (idx < s_idx)
4932 goto cont;
4933 idev = __in6_dev_get(dev);
4934 if (!idev)
4935 goto cont;
4936 if (inet6_fill_ifinfo(skb, idev,
4937 NETLINK_CB(cb->skb).portid,
4938 cb->nlh->nlmsg_seq,
4939 RTM_NEWLINK, NLM_F_MULTI) < 0)
4940 goto out;
4941 cont:
4942 idx++;
4943 }
4944 }
4945 out:
4946 rcu_read_unlock();
4947 cb->args[1] = idx;
4948 cb->args[0] = h;
4949
4950 return skb->len;
4951 }
4952
4953 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4954 {
4955 struct sk_buff *skb;
4956 struct net *net = dev_net(idev->dev);
4957 int err = -ENOBUFS;
4958
4959 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4960 if (!skb)
4961 goto errout;
4962
4963 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4964 if (err < 0) {
4965 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4966 WARN_ON(err == -EMSGSIZE);
4967 kfree_skb(skb);
4968 goto errout;
4969 }
4970 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4971 return;
4972 errout:
4973 if (err < 0)
4974 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4975 }
4976
4977 static inline size_t inet6_prefix_nlmsg_size(void)
4978 {
4979 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4980 + nla_total_size(sizeof(struct in6_addr))
4981 + nla_total_size(sizeof(struct prefix_cacheinfo));
4982 }
4983
4984 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4985 struct prefix_info *pinfo, u32 portid, u32 seq,
4986 int event, unsigned int flags)
4987 {
4988 struct prefixmsg *pmsg;
4989 struct nlmsghdr *nlh;
4990 struct prefix_cacheinfo ci;
4991
4992 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4993 if (!nlh)
4994 return -EMSGSIZE;
4995
4996 pmsg = nlmsg_data(nlh);
4997 pmsg->prefix_family = AF_INET6;
4998 pmsg->prefix_pad1 = 0;
4999 pmsg->prefix_pad2 = 0;
5000 pmsg->prefix_ifindex = idev->dev->ifindex;
5001 pmsg->prefix_len = pinfo->prefix_len;
5002 pmsg->prefix_type = pinfo->type;
5003 pmsg->prefix_pad3 = 0;
5004 pmsg->prefix_flags = 0;
5005 if (pinfo->onlink)
5006 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5007 if (pinfo->autoconf)
5008 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5009
5010 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5011 goto nla_put_failure;
5012 ci.preferred_time = ntohl(pinfo->prefered);
5013 ci.valid_time = ntohl(pinfo->valid);
5014 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5015 goto nla_put_failure;
5016 nlmsg_end(skb, nlh);
5017 return 0;
5018
5019 nla_put_failure:
5020 nlmsg_cancel(skb, nlh);
5021 return -EMSGSIZE;
5022 }
5023
5024 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5025 struct prefix_info *pinfo)
5026 {
5027 struct sk_buff *skb;
5028 struct net *net = dev_net(idev->dev);
5029 int err = -ENOBUFS;
5030
5031 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5032 if (!skb)
5033 goto errout;
5034
5035 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5036 if (err < 0) {
5037 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5038 WARN_ON(err == -EMSGSIZE);
5039 kfree_skb(skb);
5040 goto errout;
5041 }
5042 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5043 return;
5044 errout:
5045 if (err < 0)
5046 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5047 }
5048
5049 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5050 {
5051 struct net *net = dev_net(ifp->idev->dev);
5052
5053 if (event)
5054 ASSERT_RTNL();
5055
5056 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5057
5058 switch (event) {
5059 case RTM_NEWADDR:
5060 /*
5061 * If the address was optimistic
5062 * we inserted the route at the start of
5063 * our DAD process, so we don't need
5064 * to do it again
5065 */
5066 if (!(ifp->rt->rt6i_node))
5067 ip6_ins_rt(ifp->rt);
5068 if (ifp->idev->cnf.forwarding)
5069 addrconf_join_anycast(ifp);
5070 if (!ipv6_addr_any(&ifp->peer_addr))
5071 addrconf_prefix_route(&ifp->peer_addr, 128,
5072 ifp->idev->dev, 0, 0);
5073 break;
5074 case RTM_DELADDR:
5075 if (ifp->idev->cnf.forwarding)
5076 addrconf_leave_anycast(ifp);
5077 addrconf_leave_solict(ifp->idev, &ifp->addr);
5078 if (!ipv6_addr_any(&ifp->peer_addr)) {
5079 struct rt6_info *rt;
5080
5081 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5082 ifp->idev->dev, 0, 0);
5083 if (rt && ip6_del_rt(rt))
5084 dst_free(&rt->dst);
5085 }
5086 dst_hold(&ifp->rt->dst);
5087
5088 if (ip6_del_rt(ifp->rt))
5089 dst_free(&ifp->rt->dst);
5090
5091 rt_genid_bump_ipv6(net);
5092 break;
5093 }
5094 atomic_inc(&net->ipv6.dev_addr_genid);
5095 }
5096
5097 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5098 {
5099 rcu_read_lock_bh();
5100 if (likely(ifp->idev->dead == 0))
5101 __ipv6_ifa_notify(event, ifp);
5102 rcu_read_unlock_bh();
5103 }
5104
5105 #ifdef CONFIG_SYSCTL
5106
5107 static
5108 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5109 void __user *buffer, size_t *lenp, loff_t *ppos)
5110 {
5111 int *valp = ctl->data;
5112 int val = *valp;
5113 loff_t pos = *ppos;
5114 struct ctl_table lctl;
5115 int ret;
5116
5117 /*
5118 * ctl->data points to idev->cnf.forwarding, we should
5119 * not modify it until we get the rtnl lock.
5120 */
5121 lctl = *ctl;
5122 lctl.data = &val;
5123
5124 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5125
5126 if (write)
5127 ret = addrconf_fixup_forwarding(ctl, valp, val);
5128 if (ret)
5129 *ppos = pos;
5130 return ret;
5131 }
5132
5133 static
5134 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5135 void __user *buffer, size_t *lenp, loff_t *ppos)
5136 {
5137 struct inet6_dev *idev = ctl->extra1;
5138 int min_mtu = IPV6_MIN_MTU;
5139 struct ctl_table lctl;
5140
5141 lctl = *ctl;
5142 lctl.extra1 = &min_mtu;
5143 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5144
5145 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5146 }
5147
5148 static void dev_disable_change(struct inet6_dev *idev)
5149 {
5150 struct netdev_notifier_info info;
5151
5152 if (!idev || !idev->dev)
5153 return;
5154
5155 netdev_notifier_info_init(&info, idev->dev);
5156 if (idev->cnf.disable_ipv6)
5157 addrconf_notify(NULL, NETDEV_DOWN, &info);
5158 else
5159 addrconf_notify(NULL, NETDEV_UP, &info);
5160 }
5161
5162 static void addrconf_disable_change(struct net *net, __s32 newf)
5163 {
5164 struct net_device *dev;
5165 struct inet6_dev *idev;
5166
5167 rcu_read_lock();
5168 for_each_netdev_rcu(net, dev) {
5169 idev = __in6_dev_get(dev);
5170 if (idev) {
5171 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5172 idev->cnf.disable_ipv6 = newf;
5173 if (changed)
5174 dev_disable_change(idev);
5175 }
5176 }
5177 rcu_read_unlock();
5178 }
5179
5180 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5181 {
5182 struct net *net;
5183 int old;
5184
5185 if (!rtnl_trylock())
5186 return restart_syscall();
5187
5188 net = (struct net *)table->extra2;
5189 old = *p;
5190 *p = newf;
5191
5192 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5193 rtnl_unlock();
5194 return 0;
5195 }
5196
5197 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5198 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5199 addrconf_disable_change(net, newf);
5200 } else if ((!newf) ^ (!old))
5201 dev_disable_change((struct inet6_dev *)table->extra1);
5202
5203 rtnl_unlock();
5204 return 0;
5205 }
5206
5207 static
5208 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5209 void __user *buffer, size_t *lenp, loff_t *ppos)
5210 {
5211 int *valp = ctl->data;
5212 int val = *valp;
5213 loff_t pos = *ppos;
5214 struct ctl_table lctl;
5215 int ret;
5216
5217 /*
5218 * ctl->data points to idev->cnf.disable_ipv6, we should
5219 * not modify it until we get the rtnl lock.
5220 */
5221 lctl = *ctl;
5222 lctl.data = &val;
5223
5224 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5225
5226 if (write)
5227 ret = addrconf_disable_ipv6(ctl, valp, val);
5228 if (ret)
5229 *ppos = pos;
5230 return ret;
5231 }
5232
5233 static
5234 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5235 void __user *buffer, size_t *lenp, loff_t *ppos)
5236 {
5237 int *valp = ctl->data;
5238 int ret;
5239 int old, new;
5240
5241 old = *valp;
5242 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5243 new = *valp;
5244
5245 if (write && old != new) {
5246 struct net *net = ctl->extra2;
5247
5248 if (!rtnl_trylock())
5249 return restart_syscall();
5250
5251 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5252 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5253 NETCONFA_IFINDEX_DEFAULT,
5254 net->ipv6.devconf_dflt);
5255 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5256 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5257 NETCONFA_IFINDEX_ALL,
5258 net->ipv6.devconf_all);
5259 else {
5260 struct inet6_dev *idev = ctl->extra1;
5261
5262 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5263 idev->dev->ifindex,
5264 &idev->cnf);
5265 }
5266 rtnl_unlock();
5267 }
5268
5269 return ret;
5270 }
5271
5272 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5273 void __user *buffer, size_t *lenp,
5274 loff_t *ppos)
5275 {
5276 int err;
5277 struct in6_addr addr;
5278 char str[IPV6_MAX_STRLEN];
5279 struct ctl_table lctl = *ctl;
5280 struct net *net = ctl->extra2;
5281 struct ipv6_stable_secret *secret = ctl->data;
5282
5283 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5284 return -EIO;
5285
5286 lctl.maxlen = IPV6_MAX_STRLEN;
5287 lctl.data = str;
5288
5289 if (!rtnl_trylock())
5290 return restart_syscall();
5291
5292 if (!write && !secret->initialized) {
5293 err = -EIO;
5294 goto out;
5295 }
5296
5297 if (!write) {
5298 err = snprintf(str, sizeof(str), "%pI6",
5299 &secret->secret);
5300 if (err >= sizeof(str)) {
5301 err = -EIO;
5302 goto out;
5303 }
5304 }
5305
5306 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5307 if (err || !write)
5308 goto out;
5309
5310 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5311 err = -EIO;
5312 goto out;
5313 }
5314
5315 secret->initialized = true;
5316 secret->secret = addr;
5317
5318 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5319 struct net_device *dev;
5320
5321 for_each_netdev(net, dev) {
5322 struct inet6_dev *idev = __in6_dev_get(dev);
5323
5324 if (idev) {
5325 idev->addr_gen_mode =
5326 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5327 }
5328 }
5329 } else {
5330 struct inet6_dev *idev = ctl->extra1;
5331
5332 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5333 }
5334
5335 out:
5336 rtnl_unlock();
5337
5338 return err;
5339 }
5340
5341 static struct addrconf_sysctl_table
5342 {
5343 struct ctl_table_header *sysctl_header;
5344 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5345 } addrconf_sysctl __read_mostly = {
5346 .sysctl_header = NULL,
5347 .addrconf_vars = {
5348 {
5349 .procname = "forwarding",
5350 .data = &ipv6_devconf.forwarding,
5351 .maxlen = sizeof(int),
5352 .mode = 0644,
5353 .proc_handler = addrconf_sysctl_forward,
5354 },
5355 {
5356 .procname = "hop_limit",
5357 .data = &ipv6_devconf.hop_limit,
5358 .maxlen = sizeof(int),
5359 .mode = 0644,
5360 .proc_handler = proc_dointvec,
5361 },
5362 {
5363 .procname = "mtu",
5364 .data = &ipv6_devconf.mtu6,
5365 .maxlen = sizeof(int),
5366 .mode = 0644,
5367 .proc_handler = addrconf_sysctl_mtu,
5368 },
5369 {
5370 .procname = "accept_ra",
5371 .data = &ipv6_devconf.accept_ra,
5372 .maxlen = sizeof(int),
5373 .mode = 0644,
5374 .proc_handler = proc_dointvec,
5375 },
5376 {
5377 .procname = "accept_redirects",
5378 .data = &ipv6_devconf.accept_redirects,
5379 .maxlen = sizeof(int),
5380 .mode = 0644,
5381 .proc_handler = proc_dointvec,
5382 },
5383 {
5384 .procname = "autoconf",
5385 .data = &ipv6_devconf.autoconf,
5386 .maxlen = sizeof(int),
5387 .mode = 0644,
5388 .proc_handler = proc_dointvec,
5389 },
5390 {
5391 .procname = "dad_transmits",
5392 .data = &ipv6_devconf.dad_transmits,
5393 .maxlen = sizeof(int),
5394 .mode = 0644,
5395 .proc_handler = proc_dointvec,
5396 },
5397 {
5398 .procname = "router_solicitations",
5399 .data = &ipv6_devconf.rtr_solicits,
5400 .maxlen = sizeof(int),
5401 .mode = 0644,
5402 .proc_handler = proc_dointvec,
5403 },
5404 {
5405 .procname = "router_solicitation_interval",
5406 .data = &ipv6_devconf.rtr_solicit_interval,
5407 .maxlen = sizeof(int),
5408 .mode = 0644,
5409 .proc_handler = proc_dointvec_jiffies,
5410 },
5411 {
5412 .procname = "router_solicitation_delay",
5413 .data = &ipv6_devconf.rtr_solicit_delay,
5414 .maxlen = sizeof(int),
5415 .mode = 0644,
5416 .proc_handler = proc_dointvec_jiffies,
5417 },
5418 {
5419 .procname = "force_mld_version",
5420 .data = &ipv6_devconf.force_mld_version,
5421 .maxlen = sizeof(int),
5422 .mode = 0644,
5423 .proc_handler = proc_dointvec,
5424 },
5425 {
5426 .procname = "mldv1_unsolicited_report_interval",
5427 .data =
5428 &ipv6_devconf.mldv1_unsolicited_report_interval,
5429 .maxlen = sizeof(int),
5430 .mode = 0644,
5431 .proc_handler = proc_dointvec_ms_jiffies,
5432 },
5433 {
5434 .procname = "mldv2_unsolicited_report_interval",
5435 .data =
5436 &ipv6_devconf.mldv2_unsolicited_report_interval,
5437 .maxlen = sizeof(int),
5438 .mode = 0644,
5439 .proc_handler = proc_dointvec_ms_jiffies,
5440 },
5441 {
5442 .procname = "use_tempaddr",
5443 .data = &ipv6_devconf.use_tempaddr,
5444 .maxlen = sizeof(int),
5445 .mode = 0644,
5446 .proc_handler = proc_dointvec,
5447 },
5448 {
5449 .procname = "temp_valid_lft",
5450 .data = &ipv6_devconf.temp_valid_lft,
5451 .maxlen = sizeof(int),
5452 .mode = 0644,
5453 .proc_handler = proc_dointvec,
5454 },
5455 {
5456 .procname = "temp_prefered_lft",
5457 .data = &ipv6_devconf.temp_prefered_lft,
5458 .maxlen = sizeof(int),
5459 .mode = 0644,
5460 .proc_handler = proc_dointvec,
5461 },
5462 {
5463 .procname = "regen_max_retry",
5464 .data = &ipv6_devconf.regen_max_retry,
5465 .maxlen = sizeof(int),
5466 .mode = 0644,
5467 .proc_handler = proc_dointvec,
5468 },
5469 {
5470 .procname = "max_desync_factor",
5471 .data = &ipv6_devconf.max_desync_factor,
5472 .maxlen = sizeof(int),
5473 .mode = 0644,
5474 .proc_handler = proc_dointvec,
5475 },
5476 {
5477 .procname = "max_addresses",
5478 .data = &ipv6_devconf.max_addresses,
5479 .maxlen = sizeof(int),
5480 .mode = 0644,
5481 .proc_handler = proc_dointvec,
5482 },
5483 {
5484 .procname = "accept_ra_defrtr",
5485 .data = &ipv6_devconf.accept_ra_defrtr,
5486 .maxlen = sizeof(int),
5487 .mode = 0644,
5488 .proc_handler = proc_dointvec,
5489 },
5490 {
5491 .procname = "accept_ra_min_hop_limit",
5492 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5493 .maxlen = sizeof(int),
5494 .mode = 0644,
5495 .proc_handler = proc_dointvec,
5496 },
5497 {
5498 .procname = "accept_ra_pinfo",
5499 .data = &ipv6_devconf.accept_ra_pinfo,
5500 .maxlen = sizeof(int),
5501 .mode = 0644,
5502 .proc_handler = proc_dointvec,
5503 },
5504 #ifdef CONFIG_IPV6_ROUTER_PREF
5505 {
5506 .procname = "accept_ra_rtr_pref",
5507 .data = &ipv6_devconf.accept_ra_rtr_pref,
5508 .maxlen = sizeof(int),
5509 .mode = 0644,
5510 .proc_handler = proc_dointvec,
5511 },
5512 {
5513 .procname = "router_probe_interval",
5514 .data = &ipv6_devconf.rtr_probe_interval,
5515 .maxlen = sizeof(int),
5516 .mode = 0644,
5517 .proc_handler = proc_dointvec_jiffies,
5518 },
5519 #ifdef CONFIG_IPV6_ROUTE_INFO
5520 {
5521 .procname = "accept_ra_rt_info_max_plen",
5522 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5523 .maxlen = sizeof(int),
5524 .mode = 0644,
5525 .proc_handler = proc_dointvec,
5526 },
5527 #endif
5528 #endif
5529 {
5530 .procname = "proxy_ndp",
5531 .data = &ipv6_devconf.proxy_ndp,
5532 .maxlen = sizeof(int),
5533 .mode = 0644,
5534 .proc_handler = addrconf_sysctl_proxy_ndp,
5535 },
5536 {
5537 .procname = "accept_source_route",
5538 .data = &ipv6_devconf.accept_source_route,
5539 .maxlen = sizeof(int),
5540 .mode = 0644,
5541 .proc_handler = proc_dointvec,
5542 },
5543 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5544 {
5545 .procname = "optimistic_dad",
5546 .data = &ipv6_devconf.optimistic_dad,
5547 .maxlen = sizeof(int),
5548 .mode = 0644,
5549 .proc_handler = proc_dointvec,
5550
5551 },
5552 {
5553 .procname = "use_optimistic",
5554 .data = &ipv6_devconf.use_optimistic,
5555 .maxlen = sizeof(int),
5556 .mode = 0644,
5557 .proc_handler = proc_dointvec,
5558
5559 },
5560 #endif
5561 #ifdef CONFIG_IPV6_MROUTE
5562 {
5563 .procname = "mc_forwarding",
5564 .data = &ipv6_devconf.mc_forwarding,
5565 .maxlen = sizeof(int),
5566 .mode = 0444,
5567 .proc_handler = proc_dointvec,
5568 },
5569 #endif
5570 {
5571 .procname = "disable_ipv6",
5572 .data = &ipv6_devconf.disable_ipv6,
5573 .maxlen = sizeof(int),
5574 .mode = 0644,
5575 .proc_handler = addrconf_sysctl_disable,
5576 },
5577 {
5578 .procname = "accept_dad",
5579 .data = &ipv6_devconf.accept_dad,
5580 .maxlen = sizeof(int),
5581 .mode = 0644,
5582 .proc_handler = proc_dointvec,
5583 },
5584 {
5585 .procname = "force_tllao",
5586 .data = &ipv6_devconf.force_tllao,
5587 .maxlen = sizeof(int),
5588 .mode = 0644,
5589 .proc_handler = proc_dointvec
5590 },
5591 {
5592 .procname = "ndisc_notify",
5593 .data = &ipv6_devconf.ndisc_notify,
5594 .maxlen = sizeof(int),
5595 .mode = 0644,
5596 .proc_handler = proc_dointvec
5597 },
5598 {
5599 .procname = "suppress_frag_ndisc",
5600 .data = &ipv6_devconf.suppress_frag_ndisc,
5601 .maxlen = sizeof(int),
5602 .mode = 0644,
5603 .proc_handler = proc_dointvec
5604 },
5605 {
5606 .procname = "accept_ra_from_local",
5607 .data = &ipv6_devconf.accept_ra_from_local,
5608 .maxlen = sizeof(int),
5609 .mode = 0644,
5610 .proc_handler = proc_dointvec,
5611 },
5612 {
5613 .procname = "accept_ra_mtu",
5614 .data = &ipv6_devconf.accept_ra_mtu,
5615 .maxlen = sizeof(int),
5616 .mode = 0644,
5617 .proc_handler = proc_dointvec,
5618 },
5619 {
5620 .procname = "stable_secret",
5621 .data = &ipv6_devconf.stable_secret,
5622 .maxlen = IPV6_MAX_STRLEN,
5623 .mode = 0600,
5624 .proc_handler = addrconf_sysctl_stable_secret,
5625 },
5626 {
5627 .procname = "use_oif_addrs_only",
5628 .data = &ipv6_devconf.use_oif_addrs_only,
5629 .maxlen = sizeof(int),
5630 .mode = 0644,
5631 .proc_handler = proc_dointvec,
5632
5633 },
5634 {
5635 /* sentinel */
5636 }
5637 },
5638 };
5639
5640 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5641 struct inet6_dev *idev, struct ipv6_devconf *p)
5642 {
5643 int i;
5644 struct addrconf_sysctl_table *t;
5645 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5646
5647 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5648 if (!t)
5649 goto out;
5650
5651 for (i = 0; t->addrconf_vars[i].data; i++) {
5652 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5653 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5654 t->addrconf_vars[i].extra2 = net;
5655 }
5656
5657 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5658
5659 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5660 if (!t->sysctl_header)
5661 goto free;
5662
5663 p->sysctl = t;
5664 return 0;
5665
5666 free:
5667 kfree(t);
5668 out:
5669 return -ENOBUFS;
5670 }
5671
5672 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5673 {
5674 struct addrconf_sysctl_table *t;
5675
5676 if (!p->sysctl)
5677 return;
5678
5679 t = p->sysctl;
5680 p->sysctl = NULL;
5681 unregister_net_sysctl_table(t->sysctl_header);
5682 kfree(t);
5683 }
5684
5685 static int addrconf_sysctl_register(struct inet6_dev *idev)
5686 {
5687 int err;
5688
5689 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5690 return -EINVAL;
5691
5692 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5693 &ndisc_ifinfo_sysctl_change);
5694 if (err)
5695 return err;
5696 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5697 idev, &idev->cnf);
5698 if (err)
5699 neigh_sysctl_unregister(idev->nd_parms);
5700
5701 return err;
5702 }
5703
5704 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5705 {
5706 __addrconf_sysctl_unregister(&idev->cnf);
5707 neigh_sysctl_unregister(idev->nd_parms);
5708 }
5709
5710
5711 #endif
5712
5713 static int __net_init addrconf_init_net(struct net *net)
5714 {
5715 int err = -ENOMEM;
5716 struct ipv6_devconf *all, *dflt;
5717
5718 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5719 if (!all)
5720 goto err_alloc_all;
5721
5722 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5723 if (!dflt)
5724 goto err_alloc_dflt;
5725
5726 /* these will be inherited by all namespaces */
5727 dflt->autoconf = ipv6_defaults.autoconf;
5728 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5729
5730 dflt->stable_secret.initialized = false;
5731 all->stable_secret.initialized = false;
5732
5733 net->ipv6.devconf_all = all;
5734 net->ipv6.devconf_dflt = dflt;
5735
5736 #ifdef CONFIG_SYSCTL
5737 err = __addrconf_sysctl_register(net, "all", NULL, all);
5738 if (err < 0)
5739 goto err_reg_all;
5740
5741 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5742 if (err < 0)
5743 goto err_reg_dflt;
5744 #endif
5745 return 0;
5746
5747 #ifdef CONFIG_SYSCTL
5748 err_reg_dflt:
5749 __addrconf_sysctl_unregister(all);
5750 err_reg_all:
5751 kfree(dflt);
5752 #endif
5753 err_alloc_dflt:
5754 kfree(all);
5755 err_alloc_all:
5756 return err;
5757 }
5758
5759 static void __net_exit addrconf_exit_net(struct net *net)
5760 {
5761 #ifdef CONFIG_SYSCTL
5762 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5763 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5764 #endif
5765 kfree(net->ipv6.devconf_dflt);
5766 kfree(net->ipv6.devconf_all);
5767 }
5768
5769 static struct pernet_operations addrconf_ops = {
5770 .init = addrconf_init_net,
5771 .exit = addrconf_exit_net,
5772 };
5773
5774 static struct rtnl_af_ops inet6_ops __read_mostly = {
5775 .family = AF_INET6,
5776 .fill_link_af = inet6_fill_link_af,
5777 .get_link_af_size = inet6_get_link_af_size,
5778 .validate_link_af = inet6_validate_link_af,
5779 .set_link_af = inet6_set_link_af,
5780 };
5781
5782 /*
5783 * Init / cleanup code
5784 */
5785
5786 int __init addrconf_init(void)
5787 {
5788 struct inet6_dev *idev;
5789 int i, err;
5790
5791 err = ipv6_addr_label_init();
5792 if (err < 0) {
5793 pr_crit("%s: cannot initialize default policy table: %d\n",
5794 __func__, err);
5795 goto out;
5796 }
5797
5798 err = register_pernet_subsys(&addrconf_ops);
5799 if (err < 0)
5800 goto out_addrlabel;
5801
5802 addrconf_wq = create_workqueue("ipv6_addrconf");
5803 if (!addrconf_wq) {
5804 err = -ENOMEM;
5805 goto out_nowq;
5806 }
5807
5808 /* The addrconf netdev notifier requires that loopback_dev
5809 * has it's ipv6 private information allocated and setup
5810 * before it can bring up and give link-local addresses
5811 * to other devices which are up.
5812 *
5813 * Unfortunately, loopback_dev is not necessarily the first
5814 * entry in the global dev_base list of net devices. In fact,
5815 * it is likely to be the very last entry on that list.
5816 * So this causes the notifier registry below to try and
5817 * give link-local addresses to all devices besides loopback_dev
5818 * first, then loopback_dev, which cases all the non-loopback_dev
5819 * devices to fail to get a link-local address.
5820 *
5821 * So, as a temporary fix, allocate the ipv6 structure for
5822 * loopback_dev first by hand.
5823 * Longer term, all of the dependencies ipv6 has upon the loopback
5824 * device and it being up should be removed.
5825 */
5826 rtnl_lock();
5827 idev = ipv6_add_dev(init_net.loopback_dev);
5828 rtnl_unlock();
5829 if (IS_ERR(idev)) {
5830 err = PTR_ERR(idev);
5831 goto errlo;
5832 }
5833
5834 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5835 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5836
5837 register_netdevice_notifier(&ipv6_dev_notf);
5838
5839 addrconf_verify();
5840
5841 rtnl_af_register(&inet6_ops);
5842
5843 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5844 NULL);
5845 if (err < 0)
5846 goto errout;
5847
5848 /* Only the first call to __rtnl_register can fail */
5849 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5850 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5851 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5852 inet6_dump_ifaddr, NULL);
5853 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5854 inet6_dump_ifmcaddr, NULL);
5855 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5856 inet6_dump_ifacaddr, NULL);
5857 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5858 inet6_netconf_dump_devconf, NULL);
5859
5860 ipv6_addr_label_rtnl_register();
5861
5862 return 0;
5863 errout:
5864 rtnl_af_unregister(&inet6_ops);
5865 unregister_netdevice_notifier(&ipv6_dev_notf);
5866 errlo:
5867 destroy_workqueue(addrconf_wq);
5868 out_nowq:
5869 unregister_pernet_subsys(&addrconf_ops);
5870 out_addrlabel:
5871 ipv6_addr_label_cleanup();
5872 out:
5873 return err;
5874 }
5875
5876 void addrconf_cleanup(void)
5877 {
5878 struct net_device *dev;
5879 int i;
5880
5881 unregister_netdevice_notifier(&ipv6_dev_notf);
5882 unregister_pernet_subsys(&addrconf_ops);
5883 ipv6_addr_label_cleanup();
5884
5885 rtnl_lock();
5886
5887 __rtnl_af_unregister(&inet6_ops);
5888
5889 /* clean dev list */
5890 for_each_netdev(&init_net, dev) {
5891 if (__in6_dev_get(dev) == NULL)
5892 continue;
5893 addrconf_ifdown(dev, 1);
5894 }
5895 addrconf_ifdown(init_net.loopback_dev, 2);
5896
5897 /*
5898 * Check hash table.
5899 */
5900 spin_lock_bh(&addrconf_hash_lock);
5901 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5902 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5903 spin_unlock_bh(&addrconf_hash_lock);
5904 cancel_delayed_work(&addr_chk_work);
5905 rtnl_unlock();
5906
5907 destroy_workqueue(addrconf_wq);
5908 }
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