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Merge tag 'efi-urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi into...
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/sched/signal.h>
47 #include <linux/socket.h>
48 #include <linux/sockios.h>
49 #include <linux/net.h>
50 #include <linux/inet.h>
51 #include <linux/in6.h>
52 #include <linux/netdevice.h>
53 #include <linux/if_addr.h>
54 #include <linux/if_arp.h>
55 #include <linux/if_arcnet.h>
56 #include <linux/if_infiniband.h>
57 #include <linux/route.h>
58 #include <linux/inetdevice.h>
59 #include <linux/init.h>
60 #include <linux/slab.h>
61 #ifdef CONFIG_SYSCTL
62 #include <linux/sysctl.h>
63 #endif
64 #include <linux/capability.h>
65 #include <linux/delay.h>
66 #include <linux/notifier.h>
67 #include <linux/string.h>
68 #include <linux/hash.h>
69
70 #include <net/net_namespace.h>
71 #include <net/sock.h>
72 #include <net/snmp.h>
73
74 #include <net/6lowpan.h>
75 #include <net/firewire.h>
76 #include <net/ipv6.h>
77 #include <net/protocol.h>
78 #include <net/ndisc.h>
79 #include <net/ip6_route.h>
80 #include <net/addrconf.h>
81 #include <net/tcp.h>
82 #include <net/ip.h>
83 #include <net/netlink.h>
84 #include <net/pkt_sched.h>
85 #include <net/l3mdev.h>
86 #include <linux/if_tunnel.h>
87 #include <linux/rtnetlink.h>
88 #include <linux/netconf.h>
89 #include <linux/random.h>
90 #include <linux/uaccess.h>
91 #include <asm/unaligned.h>
92
93 #include <linux/proc_fs.h>
94 #include <linux/seq_file.h>
95 #include <linux/export.h>
96
97 /* Set to 3 to get tracing... */
98 #define ACONF_DEBUG 2
99
100 #if ACONF_DEBUG >= 3
101 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
102 #else
103 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
104 #endif
105
106 #define INFINITY_LIFE_TIME 0xFFFFFFFF
107
108 #define IPV6_MAX_STRLEN \
109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
110
111 static inline u32 cstamp_delta(unsigned long cstamp)
112 {
113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
114 }
115
116 static inline s32 rfc3315_s14_backoff_init(s32 irt)
117 {
118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
120 do_div(tmp, 1000000);
121 return (s32)tmp;
122 }
123
124 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
125 {
126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
128 do_div(tmp, 1000000);
129 if ((s32)tmp > mrt) {
130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
132 do_div(tmp, 1000000);
133 }
134 return (s32)tmp;
135 }
136
137 #ifdef CONFIG_SYSCTL
138 static int addrconf_sysctl_register(struct inet6_dev *idev);
139 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
140 #else
141 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
142 {
143 return 0;
144 }
145
146 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
147 {
148 }
149 #endif
150
151 static void ipv6_regen_rndid(struct inet6_dev *idev);
152 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
153
154 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
155 static int ipv6_count_addresses(struct inet6_dev *idev);
156 static int ipv6_generate_stable_address(struct in6_addr *addr,
157 u8 dad_count,
158 const struct inet6_dev *idev);
159
160 /*
161 * Configured unicast address hash table
162 */
163 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
164 static DEFINE_SPINLOCK(addrconf_hash_lock);
165
166 static void addrconf_verify(void);
167 static void addrconf_verify_rtnl(void);
168 static void addrconf_verify_work(struct work_struct *);
169
170 static struct workqueue_struct *addrconf_wq;
171 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
172
173 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
174 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
175
176 static void addrconf_type_change(struct net_device *dev,
177 unsigned long event);
178 static int addrconf_ifdown(struct net_device *dev, int how);
179
180 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
181 int plen,
182 const struct net_device *dev,
183 u32 flags, u32 noflags);
184
185 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
186 static void addrconf_dad_work(struct work_struct *w);
187 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
188 static void addrconf_dad_run(struct inet6_dev *idev);
189 static void addrconf_rs_timer(unsigned long data);
190 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
192
193 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
194 struct prefix_info *pinfo);
195 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
196 struct net_device *dev);
197
198 static struct ipv6_devconf ipv6_devconf __read_mostly = {
199 .forwarding = 0,
200 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
201 .mtu6 = IPV6_MIN_MTU,
202 .accept_ra = 1,
203 .accept_redirects = 1,
204 .autoconf = 1,
205 .force_mld_version = 0,
206 .mldv1_unsolicited_report_interval = 10 * HZ,
207 .mldv2_unsolicited_report_interval = HZ,
208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
213 .use_tempaddr = 0,
214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
218 .max_addresses = IPV6_MAX_ADDRESSES,
219 .accept_ra_defrtr = 1,
220 .accept_ra_from_local = 0,
221 .accept_ra_min_hop_limit= 1,
222 .accept_ra_pinfo = 1,
223 #ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
225 .rtr_probe_interval = 60 * HZ,
226 #ifdef CONFIG_IPV6_ROUTE_INFO
227 .accept_ra_rt_info_max_plen = 0,
228 #endif
229 #endif
230 .proxy_ndp = 0,
231 .accept_source_route = 0, /* we do not accept RH0 by default. */
232 .disable_ipv6 = 0,
233 .accept_dad = 1,
234 .suppress_frag_ndisc = 1,
235 .accept_ra_mtu = 1,
236 .stable_secret = {
237 .initialized = false,
238 },
239 .use_oif_addrs_only = 0,
240 .ignore_routes_with_linkdown = 0,
241 .keep_addr_on_down = 0,
242 .seg6_enabled = 0,
243 #ifdef CONFIG_IPV6_SEG6_HMAC
244 .seg6_require_hmac = 0,
245 #endif
246 .enhanced_dad = 1,
247 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
248 };
249
250 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
251 .forwarding = 0,
252 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
253 .mtu6 = IPV6_MIN_MTU,
254 .accept_ra = 1,
255 .accept_redirects = 1,
256 .autoconf = 1,
257 .force_mld_version = 0,
258 .mldv1_unsolicited_report_interval = 10 * HZ,
259 .mldv2_unsolicited_report_interval = HZ,
260 .dad_transmits = 1,
261 .rtr_solicits = MAX_RTR_SOLICITATIONS,
262 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
263 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
264 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
265 .use_tempaddr = 0,
266 .temp_valid_lft = TEMP_VALID_LIFETIME,
267 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
268 .regen_max_retry = REGEN_MAX_RETRY,
269 .max_desync_factor = MAX_DESYNC_FACTOR,
270 .max_addresses = IPV6_MAX_ADDRESSES,
271 .accept_ra_defrtr = 1,
272 .accept_ra_from_local = 0,
273 .accept_ra_min_hop_limit= 1,
274 .accept_ra_pinfo = 1,
275 #ifdef CONFIG_IPV6_ROUTER_PREF
276 .accept_ra_rtr_pref = 1,
277 .rtr_probe_interval = 60 * HZ,
278 #ifdef CONFIG_IPV6_ROUTE_INFO
279 .accept_ra_rt_info_max_plen = 0,
280 #endif
281 #endif
282 .proxy_ndp = 0,
283 .accept_source_route = 0, /* we do not accept RH0 by default. */
284 .disable_ipv6 = 0,
285 .accept_dad = 1,
286 .suppress_frag_ndisc = 1,
287 .accept_ra_mtu = 1,
288 .stable_secret = {
289 .initialized = false,
290 },
291 .use_oif_addrs_only = 0,
292 .ignore_routes_with_linkdown = 0,
293 .keep_addr_on_down = 0,
294 .seg6_enabled = 0,
295 #ifdef CONFIG_IPV6_SEG6_HMAC
296 .seg6_require_hmac = 0,
297 #endif
298 .enhanced_dad = 1,
299 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
300 };
301
302 /* Check if a valid qdisc is available */
303 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
304 {
305 return !qdisc_tx_is_noop(dev);
306 }
307
308 static void addrconf_del_rs_timer(struct inet6_dev *idev)
309 {
310 if (del_timer(&idev->rs_timer))
311 __in6_dev_put(idev);
312 }
313
314 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
315 {
316 if (cancel_delayed_work(&ifp->dad_work))
317 __in6_ifa_put(ifp);
318 }
319
320 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
321 unsigned long when)
322 {
323 if (!timer_pending(&idev->rs_timer))
324 in6_dev_hold(idev);
325 mod_timer(&idev->rs_timer, jiffies + when);
326 }
327
328 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
329 unsigned long delay)
330 {
331 if (!delayed_work_pending(&ifp->dad_work))
332 in6_ifa_hold(ifp);
333 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
334 }
335
336 static int snmp6_alloc_dev(struct inet6_dev *idev)
337 {
338 int i;
339
340 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
341 if (!idev->stats.ipv6)
342 goto err_ip;
343
344 for_each_possible_cpu(i) {
345 struct ipstats_mib *addrconf_stats;
346 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
347 u64_stats_init(&addrconf_stats->syncp);
348 }
349
350
351 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
352 GFP_KERNEL);
353 if (!idev->stats.icmpv6dev)
354 goto err_icmp;
355 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
356 GFP_KERNEL);
357 if (!idev->stats.icmpv6msgdev)
358 goto err_icmpmsg;
359
360 return 0;
361
362 err_icmpmsg:
363 kfree(idev->stats.icmpv6dev);
364 err_icmp:
365 free_percpu(idev->stats.ipv6);
366 err_ip:
367 return -ENOMEM;
368 }
369
370 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
371 {
372 struct inet6_dev *ndev;
373 int err = -ENOMEM;
374
375 ASSERT_RTNL();
376
377 if (dev->mtu < IPV6_MIN_MTU)
378 return ERR_PTR(-EINVAL);
379
380 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
381 if (!ndev)
382 return ERR_PTR(err);
383
384 rwlock_init(&ndev->lock);
385 ndev->dev = dev;
386 INIT_LIST_HEAD(&ndev->addr_list);
387 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
388 (unsigned long)ndev);
389 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
390
391 if (ndev->cnf.stable_secret.initialized)
392 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
393 else
394 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
395
396 ndev->cnf.mtu6 = dev->mtu;
397 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
398 if (!ndev->nd_parms) {
399 kfree(ndev);
400 return ERR_PTR(err);
401 }
402 if (ndev->cnf.forwarding)
403 dev_disable_lro(dev);
404 /* We refer to the device */
405 dev_hold(dev);
406
407 if (snmp6_alloc_dev(ndev) < 0) {
408 ADBG(KERN_WARNING
409 "%s: cannot allocate memory for statistics; dev=%s.\n",
410 __func__, dev->name);
411 neigh_parms_release(&nd_tbl, ndev->nd_parms);
412 dev_put(dev);
413 kfree(ndev);
414 return ERR_PTR(err);
415 }
416
417 if (snmp6_register_dev(ndev) < 0) {
418 ADBG(KERN_WARNING
419 "%s: cannot create /proc/net/dev_snmp6/%s\n",
420 __func__, dev->name);
421 goto err_release;
422 }
423
424 /* One reference from device. */
425 in6_dev_hold(ndev);
426
427 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
428 ndev->cnf.accept_dad = -1;
429
430 #if IS_ENABLED(CONFIG_IPV6_SIT)
431 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
432 pr_info("%s: Disabled Multicast RS\n", dev->name);
433 ndev->cnf.rtr_solicits = 0;
434 }
435 #endif
436
437 INIT_LIST_HEAD(&ndev->tempaddr_list);
438 ndev->desync_factor = U32_MAX;
439 if ((dev->flags&IFF_LOOPBACK) ||
440 dev->type == ARPHRD_TUNNEL ||
441 dev->type == ARPHRD_TUNNEL6 ||
442 dev->type == ARPHRD_SIT ||
443 dev->type == ARPHRD_NONE) {
444 ndev->cnf.use_tempaddr = -1;
445 } else
446 ipv6_regen_rndid(ndev);
447
448 ndev->token = in6addr_any;
449
450 if (netif_running(dev) && addrconf_qdisc_ok(dev))
451 ndev->if_flags |= IF_READY;
452
453 ipv6_mc_init_dev(ndev);
454 ndev->tstamp = jiffies;
455 err = addrconf_sysctl_register(ndev);
456 if (err) {
457 ipv6_mc_destroy_dev(ndev);
458 snmp6_unregister_dev(ndev);
459 goto err_release;
460 }
461 /* protected by rtnl_lock */
462 rcu_assign_pointer(dev->ip6_ptr, ndev);
463
464 /* Join interface-local all-node multicast group */
465 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
466
467 /* Join all-node multicast group */
468 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
469
470 /* Join all-router multicast group if forwarding is set */
471 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
473
474 return ndev;
475
476 err_release:
477 neigh_parms_release(&nd_tbl, ndev->nd_parms);
478 ndev->dead = 1;
479 in6_dev_finish_destroy(ndev);
480 return ERR_PTR(err);
481 }
482
483 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
484 {
485 struct inet6_dev *idev;
486
487 ASSERT_RTNL();
488
489 idev = __in6_dev_get(dev);
490 if (!idev) {
491 idev = ipv6_add_dev(dev);
492 if (IS_ERR(idev))
493 return NULL;
494 }
495
496 if (dev->flags&IFF_UP)
497 ipv6_mc_up(idev);
498 return idev;
499 }
500
501 static int inet6_netconf_msgsize_devconf(int type)
502 {
503 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
504 + nla_total_size(4); /* NETCONFA_IFINDEX */
505 bool all = false;
506
507 if (type == NETCONFA_ALL)
508 all = true;
509
510 if (all || type == NETCONFA_FORWARDING)
511 size += nla_total_size(4);
512 #ifdef CONFIG_IPV6_MROUTE
513 if (all || type == NETCONFA_MC_FORWARDING)
514 size += nla_total_size(4);
515 #endif
516 if (all || type == NETCONFA_PROXY_NEIGH)
517 size += nla_total_size(4);
518
519 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
520 size += nla_total_size(4);
521
522 return size;
523 }
524
525 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
526 struct ipv6_devconf *devconf, u32 portid,
527 u32 seq, int event, unsigned int flags,
528 int type)
529 {
530 struct nlmsghdr *nlh;
531 struct netconfmsg *ncm;
532 bool all = false;
533
534 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
535 flags);
536 if (!nlh)
537 return -EMSGSIZE;
538
539 if (type == NETCONFA_ALL)
540 all = true;
541
542 ncm = nlmsg_data(nlh);
543 ncm->ncm_family = AF_INET6;
544
545 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
546 goto nla_put_failure;
547
548 if ((all || type == NETCONFA_FORWARDING) &&
549 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
550 goto nla_put_failure;
551 #ifdef CONFIG_IPV6_MROUTE
552 if ((all || type == NETCONFA_MC_FORWARDING) &&
553 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
554 devconf->mc_forwarding) < 0)
555 goto nla_put_failure;
556 #endif
557 if ((all || type == NETCONFA_PROXY_NEIGH) &&
558 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
559 goto nla_put_failure;
560
561 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
562 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
563 devconf->ignore_routes_with_linkdown) < 0)
564 goto nla_put_failure;
565
566 nlmsg_end(skb, nlh);
567 return 0;
568
569 nla_put_failure:
570 nlmsg_cancel(skb, nlh);
571 return -EMSGSIZE;
572 }
573
574 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
575 struct ipv6_devconf *devconf)
576 {
577 struct sk_buff *skb;
578 int err = -ENOBUFS;
579
580 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
581 if (!skb)
582 goto errout;
583
584 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
585 RTM_NEWNETCONF, 0, type);
586 if (err < 0) {
587 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
588 WARN_ON(err == -EMSGSIZE);
589 kfree_skb(skb);
590 goto errout;
591 }
592 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
593 return;
594 errout:
595 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
596 }
597
598 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
599 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
600 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
601 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
602 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
603 };
604
605 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
606 struct nlmsghdr *nlh)
607 {
608 struct net *net = sock_net(in_skb->sk);
609 struct nlattr *tb[NETCONFA_MAX+1];
610 struct netconfmsg *ncm;
611 struct sk_buff *skb;
612 struct ipv6_devconf *devconf;
613 struct inet6_dev *in6_dev;
614 struct net_device *dev;
615 int ifindex;
616 int err;
617
618 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
619 devconf_ipv6_policy);
620 if (err < 0)
621 goto errout;
622
623 err = -EINVAL;
624 if (!tb[NETCONFA_IFINDEX])
625 goto errout;
626
627 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
628 switch (ifindex) {
629 case NETCONFA_IFINDEX_ALL:
630 devconf = net->ipv6.devconf_all;
631 break;
632 case NETCONFA_IFINDEX_DEFAULT:
633 devconf = net->ipv6.devconf_dflt;
634 break;
635 default:
636 dev = __dev_get_by_index(net, ifindex);
637 if (!dev)
638 goto errout;
639 in6_dev = __in6_dev_get(dev);
640 if (!in6_dev)
641 goto errout;
642 devconf = &in6_dev->cnf;
643 break;
644 }
645
646 err = -ENOBUFS;
647 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
648 if (!skb)
649 goto errout;
650
651 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
652 NETLINK_CB(in_skb).portid,
653 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
654 NETCONFA_ALL);
655 if (err < 0) {
656 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
657 WARN_ON(err == -EMSGSIZE);
658 kfree_skb(skb);
659 goto errout;
660 }
661 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
662 errout:
663 return err;
664 }
665
666 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
667 struct netlink_callback *cb)
668 {
669 struct net *net = sock_net(skb->sk);
670 int h, s_h;
671 int idx, s_idx;
672 struct net_device *dev;
673 struct inet6_dev *idev;
674 struct hlist_head *head;
675
676 s_h = cb->args[0];
677 s_idx = idx = cb->args[1];
678
679 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
680 idx = 0;
681 head = &net->dev_index_head[h];
682 rcu_read_lock();
683 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
684 net->dev_base_seq;
685 hlist_for_each_entry_rcu(dev, head, index_hlist) {
686 if (idx < s_idx)
687 goto cont;
688 idev = __in6_dev_get(dev);
689 if (!idev)
690 goto cont;
691
692 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
693 &idev->cnf,
694 NETLINK_CB(cb->skb).portid,
695 cb->nlh->nlmsg_seq,
696 RTM_NEWNETCONF,
697 NLM_F_MULTI,
698 NETCONFA_ALL) < 0) {
699 rcu_read_unlock();
700 goto done;
701 }
702 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
703 cont:
704 idx++;
705 }
706 rcu_read_unlock();
707 }
708 if (h == NETDEV_HASHENTRIES) {
709 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
710 net->ipv6.devconf_all,
711 NETLINK_CB(cb->skb).portid,
712 cb->nlh->nlmsg_seq,
713 RTM_NEWNETCONF, NLM_F_MULTI,
714 NETCONFA_ALL) < 0)
715 goto done;
716 else
717 h++;
718 }
719 if (h == NETDEV_HASHENTRIES + 1) {
720 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
721 net->ipv6.devconf_dflt,
722 NETLINK_CB(cb->skb).portid,
723 cb->nlh->nlmsg_seq,
724 RTM_NEWNETCONF, NLM_F_MULTI,
725 NETCONFA_ALL) < 0)
726 goto done;
727 else
728 h++;
729 }
730 done:
731 cb->args[0] = h;
732 cb->args[1] = idx;
733
734 return skb->len;
735 }
736
737 #ifdef CONFIG_SYSCTL
738 static void dev_forward_change(struct inet6_dev *idev)
739 {
740 struct net_device *dev;
741 struct inet6_ifaddr *ifa;
742
743 if (!idev)
744 return;
745 dev = idev->dev;
746 if (idev->cnf.forwarding)
747 dev_disable_lro(dev);
748 if (dev->flags & IFF_MULTICAST) {
749 if (idev->cnf.forwarding) {
750 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
751 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
752 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
753 } else {
754 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
755 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
756 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
757 }
758 }
759
760 list_for_each_entry(ifa, &idev->addr_list, if_list) {
761 if (ifa->flags&IFA_F_TENTATIVE)
762 continue;
763 if (idev->cnf.forwarding)
764 addrconf_join_anycast(ifa);
765 else
766 addrconf_leave_anycast(ifa);
767 }
768 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
769 dev->ifindex, &idev->cnf);
770 }
771
772
773 static void addrconf_forward_change(struct net *net, __s32 newf)
774 {
775 struct net_device *dev;
776 struct inet6_dev *idev;
777
778 for_each_netdev(net, dev) {
779 idev = __in6_dev_get(dev);
780 if (idev) {
781 int changed = (!idev->cnf.forwarding) ^ (!newf);
782 idev->cnf.forwarding = newf;
783 if (changed)
784 dev_forward_change(idev);
785 }
786 }
787 }
788
789 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
790 {
791 struct net *net;
792 int old;
793
794 if (!rtnl_trylock())
795 return restart_syscall();
796
797 net = (struct net *)table->extra2;
798 old = *p;
799 *p = newf;
800
801 if (p == &net->ipv6.devconf_dflt->forwarding) {
802 if ((!newf) ^ (!old))
803 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
804 NETCONFA_IFINDEX_DEFAULT,
805 net->ipv6.devconf_dflt);
806 rtnl_unlock();
807 return 0;
808 }
809
810 if (p == &net->ipv6.devconf_all->forwarding) {
811 int old_dflt = net->ipv6.devconf_dflt->forwarding;
812
813 net->ipv6.devconf_dflt->forwarding = newf;
814 if ((!newf) ^ (!old_dflt))
815 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
816 NETCONFA_IFINDEX_DEFAULT,
817 net->ipv6.devconf_dflt);
818
819 addrconf_forward_change(net, newf);
820 if ((!newf) ^ (!old))
821 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
822 NETCONFA_IFINDEX_ALL,
823 net->ipv6.devconf_all);
824 } else if ((!newf) ^ (!old))
825 dev_forward_change((struct inet6_dev *)table->extra1);
826 rtnl_unlock();
827
828 if (newf)
829 rt6_purge_dflt_routers(net);
830 return 1;
831 }
832
833 static void addrconf_linkdown_change(struct net *net, __s32 newf)
834 {
835 struct net_device *dev;
836 struct inet6_dev *idev;
837
838 for_each_netdev(net, dev) {
839 idev = __in6_dev_get(dev);
840 if (idev) {
841 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
842
843 idev->cnf.ignore_routes_with_linkdown = newf;
844 if (changed)
845 inet6_netconf_notify_devconf(dev_net(dev),
846 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
847 dev->ifindex,
848 &idev->cnf);
849 }
850 }
851 }
852
853 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
854 {
855 struct net *net;
856 int old;
857
858 if (!rtnl_trylock())
859 return restart_syscall();
860
861 net = (struct net *)table->extra2;
862 old = *p;
863 *p = newf;
864
865 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
866 if ((!newf) ^ (!old))
867 inet6_netconf_notify_devconf(net,
868 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
869 NETCONFA_IFINDEX_DEFAULT,
870 net->ipv6.devconf_dflt);
871 rtnl_unlock();
872 return 0;
873 }
874
875 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
876 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
877 addrconf_linkdown_change(net, newf);
878 if ((!newf) ^ (!old))
879 inet6_netconf_notify_devconf(net,
880 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
881 NETCONFA_IFINDEX_ALL,
882 net->ipv6.devconf_all);
883 }
884 rtnl_unlock();
885
886 return 1;
887 }
888
889 #endif
890
891 /* Nobody refers to this ifaddr, destroy it */
892 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
893 {
894 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
895
896 #ifdef NET_REFCNT_DEBUG
897 pr_debug("%s\n", __func__);
898 #endif
899
900 in6_dev_put(ifp->idev);
901
902 if (cancel_delayed_work(&ifp->dad_work))
903 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
904 ifp);
905
906 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
907 pr_warn("Freeing alive inet6 address %p\n", ifp);
908 return;
909 }
910 ip6_rt_put(ifp->rt);
911
912 kfree_rcu(ifp, rcu);
913 }
914
915 static void
916 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
917 {
918 struct list_head *p;
919 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
920
921 /*
922 * Each device address list is sorted in order of scope -
923 * global before linklocal.
924 */
925 list_for_each(p, &idev->addr_list) {
926 struct inet6_ifaddr *ifa
927 = list_entry(p, struct inet6_ifaddr, if_list);
928 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
929 break;
930 }
931
932 list_add_tail(&ifp->if_list, p);
933 }
934
935 static u32 inet6_addr_hash(const struct in6_addr *addr)
936 {
937 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
938 }
939
940 /* On success it returns ifp with increased reference count */
941
942 static struct inet6_ifaddr *
943 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
944 const struct in6_addr *peer_addr, int pfxlen,
945 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
946 {
947 struct inet6_ifaddr *ifa = NULL;
948 struct rt6_info *rt;
949 unsigned int hash;
950 int err = 0;
951 int addr_type = ipv6_addr_type(addr);
952
953 if (addr_type == IPV6_ADDR_ANY ||
954 addr_type & IPV6_ADDR_MULTICAST ||
955 (!(idev->dev->flags & IFF_LOOPBACK) &&
956 addr_type & IPV6_ADDR_LOOPBACK))
957 return ERR_PTR(-EADDRNOTAVAIL);
958
959 rcu_read_lock_bh();
960 if (idev->dead) {
961 err = -ENODEV; /*XXX*/
962 goto out2;
963 }
964
965 if (idev->cnf.disable_ipv6) {
966 err = -EACCES;
967 goto out2;
968 }
969
970 spin_lock(&addrconf_hash_lock);
971
972 /* Ignore adding duplicate addresses on an interface */
973 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
974 ADBG("ipv6_add_addr: already assigned\n");
975 err = -EEXIST;
976 goto out;
977 }
978
979 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
980
981 if (!ifa) {
982 ADBG("ipv6_add_addr: malloc failed\n");
983 err = -ENOBUFS;
984 goto out;
985 }
986
987 rt = addrconf_dst_alloc(idev, addr, false);
988 if (IS_ERR(rt)) {
989 err = PTR_ERR(rt);
990 goto out;
991 }
992
993 neigh_parms_data_state_setall(idev->nd_parms);
994
995 ifa->addr = *addr;
996 if (peer_addr)
997 ifa->peer_addr = *peer_addr;
998
999 spin_lock_init(&ifa->lock);
1000 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1001 INIT_HLIST_NODE(&ifa->addr_lst);
1002 ifa->scope = scope;
1003 ifa->prefix_len = pfxlen;
1004 ifa->flags = flags | IFA_F_TENTATIVE;
1005 ifa->valid_lft = valid_lft;
1006 ifa->prefered_lft = prefered_lft;
1007 ifa->cstamp = ifa->tstamp = jiffies;
1008 ifa->tokenized = false;
1009
1010 ifa->rt = rt;
1011
1012 ifa->idev = idev;
1013 in6_dev_hold(idev);
1014 /* For caller */
1015 in6_ifa_hold(ifa);
1016
1017 /* Add to big hash table */
1018 hash = inet6_addr_hash(addr);
1019
1020 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1021 spin_unlock(&addrconf_hash_lock);
1022
1023 write_lock(&idev->lock);
1024 /* Add to inet6_dev unicast addr list. */
1025 ipv6_link_dev_addr(idev, ifa);
1026
1027 if (ifa->flags&IFA_F_TEMPORARY) {
1028 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1029 in6_ifa_hold(ifa);
1030 }
1031
1032 in6_ifa_hold(ifa);
1033 write_unlock(&idev->lock);
1034 out2:
1035 rcu_read_unlock_bh();
1036
1037 if (likely(err == 0))
1038 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1039 else {
1040 kfree(ifa);
1041 ifa = ERR_PTR(err);
1042 }
1043
1044 return ifa;
1045 out:
1046 spin_unlock(&addrconf_hash_lock);
1047 goto out2;
1048 }
1049
1050 enum cleanup_prefix_rt_t {
1051 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1052 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1053 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1054 };
1055
1056 /*
1057 * Check, whether the prefix for ifp would still need a prefix route
1058 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1059 * constants.
1060 *
1061 * 1) we don't purge prefix if address was not permanent.
1062 * prefix is managed by its own lifetime.
1063 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1064 * 3) if there are no addresses, delete prefix.
1065 * 4) if there are still other permanent address(es),
1066 * corresponding prefix is still permanent.
1067 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1068 * don't purge the prefix, assume user space is managing it.
1069 * 6) otherwise, update prefix lifetime to the
1070 * longest valid lifetime among the corresponding
1071 * addresses on the device.
1072 * Note: subsequent RA will update lifetime.
1073 **/
1074 static enum cleanup_prefix_rt_t
1075 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1076 {
1077 struct inet6_ifaddr *ifa;
1078 struct inet6_dev *idev = ifp->idev;
1079 unsigned long lifetime;
1080 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1081
1082 *expires = jiffies;
1083
1084 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1085 if (ifa == ifp)
1086 continue;
1087 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1088 ifp->prefix_len))
1089 continue;
1090 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1091 return CLEANUP_PREFIX_RT_NOP;
1092
1093 action = CLEANUP_PREFIX_RT_EXPIRE;
1094
1095 spin_lock(&ifa->lock);
1096
1097 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1098 /*
1099 * Note: Because this address is
1100 * not permanent, lifetime <
1101 * LONG_MAX / HZ here.
1102 */
1103 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1104 *expires = ifa->tstamp + lifetime * HZ;
1105 spin_unlock(&ifa->lock);
1106 }
1107
1108 return action;
1109 }
1110
1111 static void
1112 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1113 {
1114 struct rt6_info *rt;
1115
1116 rt = addrconf_get_prefix_route(&ifp->addr,
1117 ifp->prefix_len,
1118 ifp->idev->dev,
1119 0, RTF_GATEWAY | RTF_DEFAULT);
1120 if (rt) {
1121 if (del_rt)
1122 ip6_del_rt(rt);
1123 else {
1124 if (!(rt->rt6i_flags & RTF_EXPIRES))
1125 rt6_set_expires(rt, expires);
1126 ip6_rt_put(rt);
1127 }
1128 }
1129 }
1130
1131
1132 /* This function wants to get referenced ifp and releases it before return */
1133
1134 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1135 {
1136 int state;
1137 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1138 unsigned long expires;
1139
1140 ASSERT_RTNL();
1141
1142 spin_lock_bh(&ifp->lock);
1143 state = ifp->state;
1144 ifp->state = INET6_IFADDR_STATE_DEAD;
1145 spin_unlock_bh(&ifp->lock);
1146
1147 if (state == INET6_IFADDR_STATE_DEAD)
1148 goto out;
1149
1150 spin_lock_bh(&addrconf_hash_lock);
1151 hlist_del_init_rcu(&ifp->addr_lst);
1152 spin_unlock_bh(&addrconf_hash_lock);
1153
1154 write_lock_bh(&ifp->idev->lock);
1155
1156 if (ifp->flags&IFA_F_TEMPORARY) {
1157 list_del(&ifp->tmp_list);
1158 if (ifp->ifpub) {
1159 in6_ifa_put(ifp->ifpub);
1160 ifp->ifpub = NULL;
1161 }
1162 __in6_ifa_put(ifp);
1163 }
1164
1165 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1166 action = check_cleanup_prefix_route(ifp, &expires);
1167
1168 list_del_init(&ifp->if_list);
1169 __in6_ifa_put(ifp);
1170
1171 write_unlock_bh(&ifp->idev->lock);
1172
1173 addrconf_del_dad_work(ifp);
1174
1175 ipv6_ifa_notify(RTM_DELADDR, ifp);
1176
1177 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1178
1179 if (action != CLEANUP_PREFIX_RT_NOP) {
1180 cleanup_prefix_route(ifp, expires,
1181 action == CLEANUP_PREFIX_RT_DEL);
1182 }
1183
1184 /* clean up prefsrc entries */
1185 rt6_remove_prefsrc(ifp);
1186 out:
1187 in6_ifa_put(ifp);
1188 }
1189
1190 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1191 {
1192 struct inet6_dev *idev = ifp->idev;
1193 struct in6_addr addr, *tmpaddr;
1194 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1195 unsigned long regen_advance;
1196 int tmp_plen;
1197 int ret = 0;
1198 u32 addr_flags;
1199 unsigned long now = jiffies;
1200 long max_desync_factor;
1201 s32 cnf_temp_preferred_lft;
1202
1203 write_lock_bh(&idev->lock);
1204 if (ift) {
1205 spin_lock_bh(&ift->lock);
1206 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1207 spin_unlock_bh(&ift->lock);
1208 tmpaddr = &addr;
1209 } else {
1210 tmpaddr = NULL;
1211 }
1212 retry:
1213 in6_dev_hold(idev);
1214 if (idev->cnf.use_tempaddr <= 0) {
1215 write_unlock_bh(&idev->lock);
1216 pr_info("%s: use_tempaddr is disabled\n", __func__);
1217 in6_dev_put(idev);
1218 ret = -1;
1219 goto out;
1220 }
1221 spin_lock_bh(&ifp->lock);
1222 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1223 idev->cnf.use_tempaddr = -1; /*XXX*/
1224 spin_unlock_bh(&ifp->lock);
1225 write_unlock_bh(&idev->lock);
1226 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1227 __func__);
1228 in6_dev_put(idev);
1229 ret = -1;
1230 goto out;
1231 }
1232 in6_ifa_hold(ifp);
1233 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1234 ipv6_try_regen_rndid(idev, tmpaddr);
1235 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1236 age = (now - ifp->tstamp) / HZ;
1237
1238 regen_advance = idev->cnf.regen_max_retry *
1239 idev->cnf.dad_transmits *
1240 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1241
1242 /* recalculate max_desync_factor each time and update
1243 * idev->desync_factor if it's larger
1244 */
1245 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1246 max_desync_factor = min_t(__u32,
1247 idev->cnf.max_desync_factor,
1248 cnf_temp_preferred_lft - regen_advance);
1249
1250 if (unlikely(idev->desync_factor > max_desync_factor)) {
1251 if (max_desync_factor > 0) {
1252 get_random_bytes(&idev->desync_factor,
1253 sizeof(idev->desync_factor));
1254 idev->desync_factor %= max_desync_factor;
1255 } else {
1256 idev->desync_factor = 0;
1257 }
1258 }
1259
1260 tmp_valid_lft = min_t(__u32,
1261 ifp->valid_lft,
1262 idev->cnf.temp_valid_lft + age);
1263 tmp_prefered_lft = cnf_temp_preferred_lft + age -
1264 idev->desync_factor;
1265 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1266 tmp_plen = ifp->prefix_len;
1267 tmp_tstamp = ifp->tstamp;
1268 spin_unlock_bh(&ifp->lock);
1269
1270 write_unlock_bh(&idev->lock);
1271
1272 /* A temporary address is created only if this calculated Preferred
1273 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1274 * an implementation must not create a temporary address with a zero
1275 * Preferred Lifetime.
1276 * Use age calculation as in addrconf_verify to avoid unnecessary
1277 * temporary addresses being generated.
1278 */
1279 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1280 if (tmp_prefered_lft <= regen_advance + age) {
1281 in6_ifa_put(ifp);
1282 in6_dev_put(idev);
1283 ret = -1;
1284 goto out;
1285 }
1286
1287 addr_flags = IFA_F_TEMPORARY;
1288 /* set in addrconf_prefix_rcv() */
1289 if (ifp->flags & IFA_F_OPTIMISTIC)
1290 addr_flags |= IFA_F_OPTIMISTIC;
1291
1292 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1293 ipv6_addr_scope(&addr), addr_flags,
1294 tmp_valid_lft, tmp_prefered_lft);
1295 if (IS_ERR(ift)) {
1296 in6_ifa_put(ifp);
1297 in6_dev_put(idev);
1298 pr_info("%s: retry temporary address regeneration\n", __func__);
1299 tmpaddr = &addr;
1300 write_lock_bh(&idev->lock);
1301 goto retry;
1302 }
1303
1304 spin_lock_bh(&ift->lock);
1305 ift->ifpub = ifp;
1306 ift->cstamp = now;
1307 ift->tstamp = tmp_tstamp;
1308 spin_unlock_bh(&ift->lock);
1309
1310 addrconf_dad_start(ift);
1311 in6_ifa_put(ift);
1312 in6_dev_put(idev);
1313 out:
1314 return ret;
1315 }
1316
1317 /*
1318 * Choose an appropriate source address (RFC3484)
1319 */
1320 enum {
1321 IPV6_SADDR_RULE_INIT = 0,
1322 IPV6_SADDR_RULE_LOCAL,
1323 IPV6_SADDR_RULE_SCOPE,
1324 IPV6_SADDR_RULE_PREFERRED,
1325 #ifdef CONFIG_IPV6_MIP6
1326 IPV6_SADDR_RULE_HOA,
1327 #endif
1328 IPV6_SADDR_RULE_OIF,
1329 IPV6_SADDR_RULE_LABEL,
1330 IPV6_SADDR_RULE_PRIVACY,
1331 IPV6_SADDR_RULE_ORCHID,
1332 IPV6_SADDR_RULE_PREFIX,
1333 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1334 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1335 #endif
1336 IPV6_SADDR_RULE_MAX
1337 };
1338
1339 struct ipv6_saddr_score {
1340 int rule;
1341 int addr_type;
1342 struct inet6_ifaddr *ifa;
1343 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1344 int scopedist;
1345 int matchlen;
1346 };
1347
1348 struct ipv6_saddr_dst {
1349 const struct in6_addr *addr;
1350 int ifindex;
1351 int scope;
1352 int label;
1353 unsigned int prefs;
1354 };
1355
1356 static inline int ipv6_saddr_preferred(int type)
1357 {
1358 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1359 return 1;
1360 return 0;
1361 }
1362
1363 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1364 {
1365 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1366 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1367 #else
1368 return false;
1369 #endif
1370 }
1371
1372 static int ipv6_get_saddr_eval(struct net *net,
1373 struct ipv6_saddr_score *score,
1374 struct ipv6_saddr_dst *dst,
1375 int i)
1376 {
1377 int ret;
1378
1379 if (i <= score->rule) {
1380 switch (i) {
1381 case IPV6_SADDR_RULE_SCOPE:
1382 ret = score->scopedist;
1383 break;
1384 case IPV6_SADDR_RULE_PREFIX:
1385 ret = score->matchlen;
1386 break;
1387 default:
1388 ret = !!test_bit(i, score->scorebits);
1389 }
1390 goto out;
1391 }
1392
1393 switch (i) {
1394 case IPV6_SADDR_RULE_INIT:
1395 /* Rule 0: remember if hiscore is not ready yet */
1396 ret = !!score->ifa;
1397 break;
1398 case IPV6_SADDR_RULE_LOCAL:
1399 /* Rule 1: Prefer same address */
1400 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1401 break;
1402 case IPV6_SADDR_RULE_SCOPE:
1403 /* Rule 2: Prefer appropriate scope
1404 *
1405 * ret
1406 * ^
1407 * -1 | d 15
1408 * ---+--+-+---> scope
1409 * |
1410 * | d is scope of the destination.
1411 * B-d | \
1412 * | \ <- smaller scope is better if
1413 * B-15 | \ if scope is enough for destination.
1414 * | ret = B - scope (-1 <= scope >= d <= 15).
1415 * d-C-1 | /
1416 * |/ <- greater is better
1417 * -C / if scope is not enough for destination.
1418 * /| ret = scope - C (-1 <= d < scope <= 15).
1419 *
1420 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1421 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1422 * Assume B = 0 and we get C > 29.
1423 */
1424 ret = __ipv6_addr_src_scope(score->addr_type);
1425 if (ret >= dst->scope)
1426 ret = -ret;
1427 else
1428 ret -= 128; /* 30 is enough */
1429 score->scopedist = ret;
1430 break;
1431 case IPV6_SADDR_RULE_PREFERRED:
1432 {
1433 /* Rule 3: Avoid deprecated and optimistic addresses */
1434 u8 avoid = IFA_F_DEPRECATED;
1435
1436 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1437 avoid |= IFA_F_OPTIMISTIC;
1438 ret = ipv6_saddr_preferred(score->addr_type) ||
1439 !(score->ifa->flags & avoid);
1440 break;
1441 }
1442 #ifdef CONFIG_IPV6_MIP6
1443 case IPV6_SADDR_RULE_HOA:
1444 {
1445 /* Rule 4: Prefer home address */
1446 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1447 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1448 break;
1449 }
1450 #endif
1451 case IPV6_SADDR_RULE_OIF:
1452 /* Rule 5: Prefer outgoing interface */
1453 ret = (!dst->ifindex ||
1454 dst->ifindex == score->ifa->idev->dev->ifindex);
1455 break;
1456 case IPV6_SADDR_RULE_LABEL:
1457 /* Rule 6: Prefer matching label */
1458 ret = ipv6_addr_label(net,
1459 &score->ifa->addr, score->addr_type,
1460 score->ifa->idev->dev->ifindex) == dst->label;
1461 break;
1462 case IPV6_SADDR_RULE_PRIVACY:
1463 {
1464 /* Rule 7: Prefer public address
1465 * Note: prefer temporary address if use_tempaddr >= 2
1466 */
1467 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1468 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1469 score->ifa->idev->cnf.use_tempaddr >= 2;
1470 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1471 break;
1472 }
1473 case IPV6_SADDR_RULE_ORCHID:
1474 /* Rule 8-: Prefer ORCHID vs ORCHID or
1475 * non-ORCHID vs non-ORCHID
1476 */
1477 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1478 ipv6_addr_orchid(dst->addr));
1479 break;
1480 case IPV6_SADDR_RULE_PREFIX:
1481 /* Rule 8: Use longest matching prefix */
1482 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1483 if (ret > score->ifa->prefix_len)
1484 ret = score->ifa->prefix_len;
1485 score->matchlen = ret;
1486 break;
1487 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1488 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1489 /* Optimistic addresses still have lower precedence than other
1490 * preferred addresses.
1491 */
1492 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1493 break;
1494 #endif
1495 default:
1496 ret = 0;
1497 }
1498
1499 if (ret)
1500 __set_bit(i, score->scorebits);
1501 score->rule = i;
1502 out:
1503 return ret;
1504 }
1505
1506 static int __ipv6_dev_get_saddr(struct net *net,
1507 struct ipv6_saddr_dst *dst,
1508 struct inet6_dev *idev,
1509 struct ipv6_saddr_score *scores,
1510 int hiscore_idx)
1511 {
1512 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1513
1514 read_lock_bh(&idev->lock);
1515 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1516 int i;
1517
1518 /*
1519 * - Tentative Address (RFC2462 section 5.4)
1520 * - A tentative address is not considered
1521 * "assigned to an interface" in the traditional
1522 * sense, unless it is also flagged as optimistic.
1523 * - Candidate Source Address (section 4)
1524 * - In any case, anycast addresses, multicast
1525 * addresses, and the unspecified address MUST
1526 * NOT be included in a candidate set.
1527 */
1528 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1529 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1530 continue;
1531
1532 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1533
1534 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1535 score->addr_type & IPV6_ADDR_MULTICAST)) {
1536 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1537 idev->dev->name);
1538 continue;
1539 }
1540
1541 score->rule = -1;
1542 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1543
1544 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1545 int minihiscore, miniscore;
1546
1547 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1548 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1549
1550 if (minihiscore > miniscore) {
1551 if (i == IPV6_SADDR_RULE_SCOPE &&
1552 score->scopedist > 0) {
1553 /*
1554 * special case:
1555 * each remaining entry
1556 * has too small (not enough)
1557 * scope, because ifa entries
1558 * are sorted by their scope
1559 * values.
1560 */
1561 goto out;
1562 }
1563 break;
1564 } else if (minihiscore < miniscore) {
1565 if (hiscore->ifa)
1566 in6_ifa_put(hiscore->ifa);
1567
1568 in6_ifa_hold(score->ifa);
1569
1570 swap(hiscore, score);
1571 hiscore_idx = 1 - hiscore_idx;
1572
1573 /* restore our iterator */
1574 score->ifa = hiscore->ifa;
1575
1576 break;
1577 }
1578 }
1579 }
1580 out:
1581 read_unlock_bh(&idev->lock);
1582 return hiscore_idx;
1583 }
1584
1585 static int ipv6_get_saddr_master(struct net *net,
1586 const struct net_device *dst_dev,
1587 const struct net_device *master,
1588 struct ipv6_saddr_dst *dst,
1589 struct ipv6_saddr_score *scores,
1590 int hiscore_idx)
1591 {
1592 struct inet6_dev *idev;
1593
1594 idev = __in6_dev_get(dst_dev);
1595 if (idev)
1596 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1597 scores, hiscore_idx);
1598
1599 idev = __in6_dev_get(master);
1600 if (idev)
1601 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1602 scores, hiscore_idx);
1603
1604 return hiscore_idx;
1605 }
1606
1607 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1608 const struct in6_addr *daddr, unsigned int prefs,
1609 struct in6_addr *saddr)
1610 {
1611 struct ipv6_saddr_score scores[2], *hiscore;
1612 struct ipv6_saddr_dst dst;
1613 struct inet6_dev *idev;
1614 struct net_device *dev;
1615 int dst_type;
1616 bool use_oif_addr = false;
1617 int hiscore_idx = 0;
1618
1619 dst_type = __ipv6_addr_type(daddr);
1620 dst.addr = daddr;
1621 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1622 dst.scope = __ipv6_addr_src_scope(dst_type);
1623 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1624 dst.prefs = prefs;
1625
1626 scores[hiscore_idx].rule = -1;
1627 scores[hiscore_idx].ifa = NULL;
1628
1629 rcu_read_lock();
1630
1631 /* Candidate Source Address (section 4)
1632 * - multicast and link-local destination address,
1633 * the set of candidate source address MUST only
1634 * include addresses assigned to interfaces
1635 * belonging to the same link as the outgoing
1636 * interface.
1637 * (- For site-local destination addresses, the
1638 * set of candidate source addresses MUST only
1639 * include addresses assigned to interfaces
1640 * belonging to the same site as the outgoing
1641 * interface.)
1642 * - "It is RECOMMENDED that the candidate source addresses
1643 * be the set of unicast addresses assigned to the
1644 * interface that will be used to send to the destination
1645 * (the 'outgoing' interface)." (RFC 6724)
1646 */
1647 if (dst_dev) {
1648 idev = __in6_dev_get(dst_dev);
1649 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1650 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1651 (idev && idev->cnf.use_oif_addrs_only)) {
1652 use_oif_addr = true;
1653 }
1654 }
1655
1656 if (use_oif_addr) {
1657 if (idev)
1658 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1659 } else {
1660 const struct net_device *master;
1661 int master_idx = 0;
1662
1663 /* if dst_dev exists and is enslaved to an L3 device, then
1664 * prefer addresses from dst_dev and then the master over
1665 * any other enslaved devices in the L3 domain.
1666 */
1667 master = l3mdev_master_dev_rcu(dst_dev);
1668 if (master) {
1669 master_idx = master->ifindex;
1670
1671 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1672 master, &dst,
1673 scores, hiscore_idx);
1674
1675 if (scores[hiscore_idx].ifa)
1676 goto out;
1677 }
1678
1679 for_each_netdev_rcu(net, dev) {
1680 /* only consider addresses on devices in the
1681 * same L3 domain
1682 */
1683 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1684 continue;
1685 idev = __in6_dev_get(dev);
1686 if (!idev)
1687 continue;
1688 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1689 }
1690 }
1691
1692 out:
1693 rcu_read_unlock();
1694
1695 hiscore = &scores[hiscore_idx];
1696 if (!hiscore->ifa)
1697 return -EADDRNOTAVAIL;
1698
1699 *saddr = hiscore->ifa->addr;
1700 in6_ifa_put(hiscore->ifa);
1701 return 0;
1702 }
1703 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1704
1705 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1706 u32 banned_flags)
1707 {
1708 struct inet6_ifaddr *ifp;
1709 int err = -EADDRNOTAVAIL;
1710
1711 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1712 if (ifp->scope > IFA_LINK)
1713 break;
1714 if (ifp->scope == IFA_LINK &&
1715 !(ifp->flags & banned_flags)) {
1716 *addr = ifp->addr;
1717 err = 0;
1718 break;
1719 }
1720 }
1721 return err;
1722 }
1723
1724 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1725 u32 banned_flags)
1726 {
1727 struct inet6_dev *idev;
1728 int err = -EADDRNOTAVAIL;
1729
1730 rcu_read_lock();
1731 idev = __in6_dev_get(dev);
1732 if (idev) {
1733 read_lock_bh(&idev->lock);
1734 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1735 read_unlock_bh(&idev->lock);
1736 }
1737 rcu_read_unlock();
1738 return err;
1739 }
1740
1741 static int ipv6_count_addresses(struct inet6_dev *idev)
1742 {
1743 int cnt = 0;
1744 struct inet6_ifaddr *ifp;
1745
1746 read_lock_bh(&idev->lock);
1747 list_for_each_entry(ifp, &idev->addr_list, if_list)
1748 cnt++;
1749 read_unlock_bh(&idev->lock);
1750 return cnt;
1751 }
1752
1753 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1754 const struct net_device *dev, int strict)
1755 {
1756 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1757 }
1758 EXPORT_SYMBOL(ipv6_chk_addr);
1759
1760 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1761 const struct net_device *dev, int strict,
1762 u32 banned_flags)
1763 {
1764 struct inet6_ifaddr *ifp;
1765 unsigned int hash = inet6_addr_hash(addr);
1766 u32 ifp_flags;
1767
1768 rcu_read_lock_bh();
1769 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1770 if (!net_eq(dev_net(ifp->idev->dev), net))
1771 continue;
1772 /* Decouple optimistic from tentative for evaluation here.
1773 * Ban optimistic addresses explicitly, when required.
1774 */
1775 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1776 ? (ifp->flags&~IFA_F_TENTATIVE)
1777 : ifp->flags;
1778 if (ipv6_addr_equal(&ifp->addr, addr) &&
1779 !(ifp_flags&banned_flags) &&
1780 (!dev || ifp->idev->dev == dev ||
1781 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1782 rcu_read_unlock_bh();
1783 return 1;
1784 }
1785 }
1786
1787 rcu_read_unlock_bh();
1788 return 0;
1789 }
1790 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1791
1792 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1793 struct net_device *dev)
1794 {
1795 unsigned int hash = inet6_addr_hash(addr);
1796 struct inet6_ifaddr *ifp;
1797
1798 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1799 if (!net_eq(dev_net(ifp->idev->dev), net))
1800 continue;
1801 if (ipv6_addr_equal(&ifp->addr, addr)) {
1802 if (!dev || ifp->idev->dev == dev)
1803 return true;
1804 }
1805 }
1806 return false;
1807 }
1808
1809 /* Compares an address/prefix_len with addresses on device @dev.
1810 * If one is found it returns true.
1811 */
1812 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1813 const unsigned int prefix_len, struct net_device *dev)
1814 {
1815 struct inet6_dev *idev;
1816 struct inet6_ifaddr *ifa;
1817 bool ret = false;
1818
1819 rcu_read_lock();
1820 idev = __in6_dev_get(dev);
1821 if (idev) {
1822 read_lock_bh(&idev->lock);
1823 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1824 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1825 if (ret)
1826 break;
1827 }
1828 read_unlock_bh(&idev->lock);
1829 }
1830 rcu_read_unlock();
1831
1832 return ret;
1833 }
1834 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1835
1836 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1837 {
1838 struct inet6_dev *idev;
1839 struct inet6_ifaddr *ifa;
1840 int onlink;
1841
1842 onlink = 0;
1843 rcu_read_lock();
1844 idev = __in6_dev_get(dev);
1845 if (idev) {
1846 read_lock_bh(&idev->lock);
1847 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1848 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1849 ifa->prefix_len);
1850 if (onlink)
1851 break;
1852 }
1853 read_unlock_bh(&idev->lock);
1854 }
1855 rcu_read_unlock();
1856 return onlink;
1857 }
1858 EXPORT_SYMBOL(ipv6_chk_prefix);
1859
1860 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1861 struct net_device *dev, int strict)
1862 {
1863 struct inet6_ifaddr *ifp, *result = NULL;
1864 unsigned int hash = inet6_addr_hash(addr);
1865
1866 rcu_read_lock_bh();
1867 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1868 if (!net_eq(dev_net(ifp->idev->dev), net))
1869 continue;
1870 if (ipv6_addr_equal(&ifp->addr, addr)) {
1871 if (!dev || ifp->idev->dev == dev ||
1872 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1873 result = ifp;
1874 in6_ifa_hold(ifp);
1875 break;
1876 }
1877 }
1878 }
1879 rcu_read_unlock_bh();
1880
1881 return result;
1882 }
1883
1884 /* Gets referenced address, destroys ifaddr */
1885
1886 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1887 {
1888 if (dad_failed)
1889 ifp->flags |= IFA_F_DADFAILED;
1890
1891 if (ifp->flags&IFA_F_PERMANENT) {
1892 spin_lock_bh(&ifp->lock);
1893 addrconf_del_dad_work(ifp);
1894 ifp->flags |= IFA_F_TENTATIVE;
1895 spin_unlock_bh(&ifp->lock);
1896 if (dad_failed)
1897 ipv6_ifa_notify(0, ifp);
1898 in6_ifa_put(ifp);
1899 } else if (ifp->flags&IFA_F_TEMPORARY) {
1900 struct inet6_ifaddr *ifpub;
1901 spin_lock_bh(&ifp->lock);
1902 ifpub = ifp->ifpub;
1903 if (ifpub) {
1904 in6_ifa_hold(ifpub);
1905 spin_unlock_bh(&ifp->lock);
1906 ipv6_create_tempaddr(ifpub, ifp);
1907 in6_ifa_put(ifpub);
1908 } else {
1909 spin_unlock_bh(&ifp->lock);
1910 }
1911 ipv6_del_addr(ifp);
1912 } else {
1913 ipv6_del_addr(ifp);
1914 }
1915 }
1916
1917 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1918 {
1919 int err = -ENOENT;
1920
1921 spin_lock_bh(&ifp->lock);
1922 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1923 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1924 err = 0;
1925 }
1926 spin_unlock_bh(&ifp->lock);
1927
1928 return err;
1929 }
1930
1931 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1932 {
1933 struct inet6_dev *idev = ifp->idev;
1934 struct net *net = dev_net(ifp->idev->dev);
1935
1936 if (addrconf_dad_end(ifp)) {
1937 in6_ifa_put(ifp);
1938 return;
1939 }
1940
1941 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1942 ifp->idev->dev->name, &ifp->addr);
1943
1944 spin_lock_bh(&ifp->lock);
1945
1946 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1947 int scope = ifp->scope;
1948 u32 flags = ifp->flags;
1949 struct in6_addr new_addr;
1950 struct inet6_ifaddr *ifp2;
1951 u32 valid_lft, preferred_lft;
1952 int pfxlen = ifp->prefix_len;
1953 int retries = ifp->stable_privacy_retry + 1;
1954
1955 if (retries > net->ipv6.sysctl.idgen_retries) {
1956 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1957 ifp->idev->dev->name);
1958 goto errdad;
1959 }
1960
1961 new_addr = ifp->addr;
1962 if (ipv6_generate_stable_address(&new_addr, retries,
1963 idev))
1964 goto errdad;
1965
1966 valid_lft = ifp->valid_lft;
1967 preferred_lft = ifp->prefered_lft;
1968
1969 spin_unlock_bh(&ifp->lock);
1970
1971 if (idev->cnf.max_addresses &&
1972 ipv6_count_addresses(idev) >=
1973 idev->cnf.max_addresses)
1974 goto lock_errdad;
1975
1976 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1977 ifp->idev->dev->name);
1978
1979 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1980 scope, flags, valid_lft,
1981 preferred_lft);
1982 if (IS_ERR(ifp2))
1983 goto lock_errdad;
1984
1985 spin_lock_bh(&ifp2->lock);
1986 ifp2->stable_privacy_retry = retries;
1987 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1988 spin_unlock_bh(&ifp2->lock);
1989
1990 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1991 in6_ifa_put(ifp2);
1992 lock_errdad:
1993 spin_lock_bh(&ifp->lock);
1994 }
1995
1996 errdad:
1997 /* transition from _POSTDAD to _ERRDAD */
1998 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1999 spin_unlock_bh(&ifp->lock);
2000
2001 addrconf_mod_dad_work(ifp, 0);
2002 in6_ifa_put(ifp);
2003 }
2004
2005 /* Join to solicited addr multicast group.
2006 * caller must hold RTNL */
2007 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2008 {
2009 struct in6_addr maddr;
2010
2011 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2012 return;
2013
2014 addrconf_addr_solict_mult(addr, &maddr);
2015 ipv6_dev_mc_inc(dev, &maddr);
2016 }
2017
2018 /* caller must hold RTNL */
2019 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2020 {
2021 struct in6_addr maddr;
2022
2023 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2024 return;
2025
2026 addrconf_addr_solict_mult(addr, &maddr);
2027 __ipv6_dev_mc_dec(idev, &maddr);
2028 }
2029
2030 /* caller must hold RTNL */
2031 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2032 {
2033 struct in6_addr addr;
2034
2035 if (ifp->prefix_len >= 127) /* RFC 6164 */
2036 return;
2037 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2038 if (ipv6_addr_any(&addr))
2039 return;
2040 __ipv6_dev_ac_inc(ifp->idev, &addr);
2041 }
2042
2043 /* caller must hold RTNL */
2044 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2045 {
2046 struct in6_addr addr;
2047
2048 if (ifp->prefix_len >= 127) /* RFC 6164 */
2049 return;
2050 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2051 if (ipv6_addr_any(&addr))
2052 return;
2053 __ipv6_dev_ac_dec(ifp->idev, &addr);
2054 }
2055
2056 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2057 {
2058 if (dev->addr_len != EUI64_ADDR_LEN)
2059 return -1;
2060 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2061 eui[0] ^= 2;
2062 return 0;
2063 }
2064
2065 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2066 {
2067 union fwnet_hwaddr *ha;
2068
2069 if (dev->addr_len != FWNET_ALEN)
2070 return -1;
2071
2072 ha = (union fwnet_hwaddr *)dev->dev_addr;
2073
2074 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2075 eui[0] ^= 2;
2076 return 0;
2077 }
2078
2079 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2080 {
2081 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2082 if (dev->addr_len != ARCNET_ALEN)
2083 return -1;
2084 memset(eui, 0, 7);
2085 eui[7] = *(u8 *)dev->dev_addr;
2086 return 0;
2087 }
2088
2089 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2090 {
2091 if (dev->addr_len != INFINIBAND_ALEN)
2092 return -1;
2093 memcpy(eui, dev->dev_addr + 12, 8);
2094 eui[0] |= 2;
2095 return 0;
2096 }
2097
2098 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2099 {
2100 if (addr == 0)
2101 return -1;
2102 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2103 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2104 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2105 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2106 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2107 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2108 eui[1] = 0;
2109 eui[2] = 0x5E;
2110 eui[3] = 0xFE;
2111 memcpy(eui + 4, &addr, 4);
2112 return 0;
2113 }
2114
2115 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2116 {
2117 if (dev->priv_flags & IFF_ISATAP)
2118 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2119 return -1;
2120 }
2121
2122 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2123 {
2124 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2125 }
2126
2127 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2128 {
2129 memcpy(eui, dev->perm_addr, 3);
2130 memcpy(eui + 5, dev->perm_addr + 3, 3);
2131 eui[3] = 0xFF;
2132 eui[4] = 0xFE;
2133 eui[0] ^= 2;
2134 return 0;
2135 }
2136
2137 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2138 {
2139 switch (dev->type) {
2140 case ARPHRD_ETHER:
2141 case ARPHRD_FDDI:
2142 return addrconf_ifid_eui48(eui, dev);
2143 case ARPHRD_ARCNET:
2144 return addrconf_ifid_arcnet(eui, dev);
2145 case ARPHRD_INFINIBAND:
2146 return addrconf_ifid_infiniband(eui, dev);
2147 case ARPHRD_SIT:
2148 return addrconf_ifid_sit(eui, dev);
2149 case ARPHRD_IPGRE:
2150 case ARPHRD_TUNNEL:
2151 return addrconf_ifid_gre(eui, dev);
2152 case ARPHRD_6LOWPAN:
2153 return addrconf_ifid_eui64(eui, dev);
2154 case ARPHRD_IEEE1394:
2155 return addrconf_ifid_ieee1394(eui, dev);
2156 case ARPHRD_TUNNEL6:
2157 case ARPHRD_IP6GRE:
2158 return addrconf_ifid_ip6tnl(eui, dev);
2159 }
2160 return -1;
2161 }
2162
2163 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2164 {
2165 int err = -1;
2166 struct inet6_ifaddr *ifp;
2167
2168 read_lock_bh(&idev->lock);
2169 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2170 if (ifp->scope > IFA_LINK)
2171 break;
2172 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2173 memcpy(eui, ifp->addr.s6_addr+8, 8);
2174 err = 0;
2175 break;
2176 }
2177 }
2178 read_unlock_bh(&idev->lock);
2179 return err;
2180 }
2181
2182 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2183 static void ipv6_regen_rndid(struct inet6_dev *idev)
2184 {
2185 regen:
2186 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2187 idev->rndid[0] &= ~0x02;
2188
2189 /*
2190 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2191 * check if generated address is not inappropriate
2192 *
2193 * - Reserved subnet anycast (RFC 2526)
2194 * 11111101 11....11 1xxxxxxx
2195 * - ISATAP (RFC4214) 6.1
2196 * 00-00-5E-FE-xx-xx-xx-xx
2197 * - value 0
2198 * - XXX: already assigned to an address on the device
2199 */
2200 if (idev->rndid[0] == 0xfd &&
2201 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2202 (idev->rndid[7]&0x80))
2203 goto regen;
2204 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2205 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2206 goto regen;
2207 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2208 goto regen;
2209 }
2210 }
2211
2212 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2213 {
2214 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2215 ipv6_regen_rndid(idev);
2216 }
2217
2218 /*
2219 * Add prefix route.
2220 */
2221
2222 static void
2223 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2224 unsigned long expires, u32 flags)
2225 {
2226 struct fib6_config cfg = {
2227 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2228 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2229 .fc_ifindex = dev->ifindex,
2230 .fc_expires = expires,
2231 .fc_dst_len = plen,
2232 .fc_flags = RTF_UP | flags,
2233 .fc_nlinfo.nl_net = dev_net(dev),
2234 .fc_protocol = RTPROT_KERNEL,
2235 };
2236
2237 cfg.fc_dst = *pfx;
2238
2239 /* Prevent useless cloning on PtP SIT.
2240 This thing is done here expecting that the whole
2241 class of non-broadcast devices need not cloning.
2242 */
2243 #if IS_ENABLED(CONFIG_IPV6_SIT)
2244 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2245 cfg.fc_flags |= RTF_NONEXTHOP;
2246 #endif
2247
2248 ip6_route_add(&cfg);
2249 }
2250
2251
2252 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2253 int plen,
2254 const struct net_device *dev,
2255 u32 flags, u32 noflags)
2256 {
2257 struct fib6_node *fn;
2258 struct rt6_info *rt = NULL;
2259 struct fib6_table *table;
2260 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2261
2262 table = fib6_get_table(dev_net(dev), tb_id);
2263 if (!table)
2264 return NULL;
2265
2266 read_lock_bh(&table->tb6_lock);
2267 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2268 if (!fn)
2269 goto out;
2270
2271 noflags |= RTF_CACHE;
2272 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2273 if (rt->dst.dev->ifindex != dev->ifindex)
2274 continue;
2275 if ((rt->rt6i_flags & flags) != flags)
2276 continue;
2277 if ((rt->rt6i_flags & noflags) != 0)
2278 continue;
2279 dst_hold(&rt->dst);
2280 break;
2281 }
2282 out:
2283 read_unlock_bh(&table->tb6_lock);
2284 return rt;
2285 }
2286
2287
2288 /* Create "default" multicast route to the interface */
2289
2290 static void addrconf_add_mroute(struct net_device *dev)
2291 {
2292 struct fib6_config cfg = {
2293 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2294 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2295 .fc_ifindex = dev->ifindex,
2296 .fc_dst_len = 8,
2297 .fc_flags = RTF_UP,
2298 .fc_nlinfo.nl_net = dev_net(dev),
2299 };
2300
2301 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2302
2303 ip6_route_add(&cfg);
2304 }
2305
2306 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2307 {
2308 struct inet6_dev *idev;
2309
2310 ASSERT_RTNL();
2311
2312 idev = ipv6_find_idev(dev);
2313 if (!idev)
2314 return ERR_PTR(-ENOBUFS);
2315
2316 if (idev->cnf.disable_ipv6)
2317 return ERR_PTR(-EACCES);
2318
2319 /* Add default multicast route */
2320 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2321 addrconf_add_mroute(dev);
2322
2323 return idev;
2324 }
2325
2326 static void manage_tempaddrs(struct inet6_dev *idev,
2327 struct inet6_ifaddr *ifp,
2328 __u32 valid_lft, __u32 prefered_lft,
2329 bool create, unsigned long now)
2330 {
2331 u32 flags;
2332 struct inet6_ifaddr *ift;
2333
2334 read_lock_bh(&idev->lock);
2335 /* update all temporary addresses in the list */
2336 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2337 int age, max_valid, max_prefered;
2338
2339 if (ifp != ift->ifpub)
2340 continue;
2341
2342 /* RFC 4941 section 3.3:
2343 * If a received option will extend the lifetime of a public
2344 * address, the lifetimes of temporary addresses should
2345 * be extended, subject to the overall constraint that no
2346 * temporary addresses should ever remain "valid" or "preferred"
2347 * for a time longer than (TEMP_VALID_LIFETIME) or
2348 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2349 */
2350 age = (now - ift->cstamp) / HZ;
2351 max_valid = idev->cnf.temp_valid_lft - age;
2352 if (max_valid < 0)
2353 max_valid = 0;
2354
2355 max_prefered = idev->cnf.temp_prefered_lft -
2356 idev->desync_factor - age;
2357 if (max_prefered < 0)
2358 max_prefered = 0;
2359
2360 if (valid_lft > max_valid)
2361 valid_lft = max_valid;
2362
2363 if (prefered_lft > max_prefered)
2364 prefered_lft = max_prefered;
2365
2366 spin_lock(&ift->lock);
2367 flags = ift->flags;
2368 ift->valid_lft = valid_lft;
2369 ift->prefered_lft = prefered_lft;
2370 ift->tstamp = now;
2371 if (prefered_lft > 0)
2372 ift->flags &= ~IFA_F_DEPRECATED;
2373
2374 spin_unlock(&ift->lock);
2375 if (!(flags&IFA_F_TENTATIVE))
2376 ipv6_ifa_notify(0, ift);
2377 }
2378
2379 if ((create || list_empty(&idev->tempaddr_list)) &&
2380 idev->cnf.use_tempaddr > 0) {
2381 /* When a new public address is created as described
2382 * in [ADDRCONF], also create a new temporary address.
2383 * Also create a temporary address if it's enabled but
2384 * no temporary address currently exists.
2385 */
2386 read_unlock_bh(&idev->lock);
2387 ipv6_create_tempaddr(ifp, NULL);
2388 } else {
2389 read_unlock_bh(&idev->lock);
2390 }
2391 }
2392
2393 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2394 {
2395 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2396 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2397 }
2398
2399 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2400 const struct prefix_info *pinfo,
2401 struct inet6_dev *in6_dev,
2402 const struct in6_addr *addr, int addr_type,
2403 u32 addr_flags, bool sllao, bool tokenized,
2404 __u32 valid_lft, u32 prefered_lft)
2405 {
2406 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2407 int create = 0, update_lft = 0;
2408
2409 if (!ifp && valid_lft) {
2410 int max_addresses = in6_dev->cnf.max_addresses;
2411
2412 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2413 if (in6_dev->cnf.optimistic_dad &&
2414 !net->ipv6.devconf_all->forwarding && sllao)
2415 addr_flags |= IFA_F_OPTIMISTIC;
2416 #endif
2417
2418 /* Do not allow to create too much of autoconfigured
2419 * addresses; this would be too easy way to crash kernel.
2420 */
2421 if (!max_addresses ||
2422 ipv6_count_addresses(in6_dev) < max_addresses)
2423 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2424 pinfo->prefix_len,
2425 addr_type&IPV6_ADDR_SCOPE_MASK,
2426 addr_flags, valid_lft,
2427 prefered_lft);
2428
2429 if (IS_ERR_OR_NULL(ifp))
2430 return -1;
2431
2432 update_lft = 0;
2433 create = 1;
2434 spin_lock_bh(&ifp->lock);
2435 ifp->flags |= IFA_F_MANAGETEMPADDR;
2436 ifp->cstamp = jiffies;
2437 ifp->tokenized = tokenized;
2438 spin_unlock_bh(&ifp->lock);
2439 addrconf_dad_start(ifp);
2440 }
2441
2442 if (ifp) {
2443 u32 flags;
2444 unsigned long now;
2445 u32 stored_lft;
2446
2447 /* update lifetime (RFC2462 5.5.3 e) */
2448 spin_lock_bh(&ifp->lock);
2449 now = jiffies;
2450 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2451 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2452 else
2453 stored_lft = 0;
2454 if (!update_lft && !create && stored_lft) {
2455 const u32 minimum_lft = min_t(u32,
2456 stored_lft, MIN_VALID_LIFETIME);
2457 valid_lft = max(valid_lft, minimum_lft);
2458
2459 /* RFC4862 Section 5.5.3e:
2460 * "Note that the preferred lifetime of the
2461 * corresponding address is always reset to
2462 * the Preferred Lifetime in the received
2463 * Prefix Information option, regardless of
2464 * whether the valid lifetime is also reset or
2465 * ignored."
2466 *
2467 * So we should always update prefered_lft here.
2468 */
2469 update_lft = 1;
2470 }
2471
2472 if (update_lft) {
2473 ifp->valid_lft = valid_lft;
2474 ifp->prefered_lft = prefered_lft;
2475 ifp->tstamp = now;
2476 flags = ifp->flags;
2477 ifp->flags &= ~IFA_F_DEPRECATED;
2478 spin_unlock_bh(&ifp->lock);
2479
2480 if (!(flags&IFA_F_TENTATIVE))
2481 ipv6_ifa_notify(0, ifp);
2482 } else
2483 spin_unlock_bh(&ifp->lock);
2484
2485 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2486 create, now);
2487
2488 in6_ifa_put(ifp);
2489 addrconf_verify();
2490 }
2491
2492 return 0;
2493 }
2494 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2495
2496 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2497 {
2498 struct prefix_info *pinfo;
2499 __u32 valid_lft;
2500 __u32 prefered_lft;
2501 int addr_type, err;
2502 u32 addr_flags = 0;
2503 struct inet6_dev *in6_dev;
2504 struct net *net = dev_net(dev);
2505
2506 pinfo = (struct prefix_info *) opt;
2507
2508 if (len < sizeof(struct prefix_info)) {
2509 ADBG("addrconf: prefix option too short\n");
2510 return;
2511 }
2512
2513 /*
2514 * Validation checks ([ADDRCONF], page 19)
2515 */
2516
2517 addr_type = ipv6_addr_type(&pinfo->prefix);
2518
2519 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2520 return;
2521
2522 valid_lft = ntohl(pinfo->valid);
2523 prefered_lft = ntohl(pinfo->prefered);
2524
2525 if (prefered_lft > valid_lft) {
2526 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2527 return;
2528 }
2529
2530 in6_dev = in6_dev_get(dev);
2531
2532 if (!in6_dev) {
2533 net_dbg_ratelimited("addrconf: device %s not configured\n",
2534 dev->name);
2535 return;
2536 }
2537
2538 /*
2539 * Two things going on here:
2540 * 1) Add routes for on-link prefixes
2541 * 2) Configure prefixes with the auto flag set
2542 */
2543
2544 if (pinfo->onlink) {
2545 struct rt6_info *rt;
2546 unsigned long rt_expires;
2547
2548 /* Avoid arithmetic overflow. Really, we could
2549 * save rt_expires in seconds, likely valid_lft,
2550 * but it would require division in fib gc, that it
2551 * not good.
2552 */
2553 if (HZ > USER_HZ)
2554 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2555 else
2556 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2557
2558 if (addrconf_finite_timeout(rt_expires))
2559 rt_expires *= HZ;
2560
2561 rt = addrconf_get_prefix_route(&pinfo->prefix,
2562 pinfo->prefix_len,
2563 dev,
2564 RTF_ADDRCONF | RTF_PREFIX_RT,
2565 RTF_GATEWAY | RTF_DEFAULT);
2566
2567 if (rt) {
2568 /* Autoconf prefix route */
2569 if (valid_lft == 0) {
2570 ip6_del_rt(rt);
2571 rt = NULL;
2572 } else if (addrconf_finite_timeout(rt_expires)) {
2573 /* not infinity */
2574 rt6_set_expires(rt, jiffies + rt_expires);
2575 } else {
2576 rt6_clean_expires(rt);
2577 }
2578 } else if (valid_lft) {
2579 clock_t expires = 0;
2580 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2581 if (addrconf_finite_timeout(rt_expires)) {
2582 /* not infinity */
2583 flags |= RTF_EXPIRES;
2584 expires = jiffies_to_clock_t(rt_expires);
2585 }
2586 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2587 dev, expires, flags);
2588 }
2589 ip6_rt_put(rt);
2590 }
2591
2592 /* Try to figure out our local address for this prefix */
2593
2594 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2595 struct in6_addr addr;
2596 bool tokenized = false, dev_addr_generated = false;
2597
2598 if (pinfo->prefix_len == 64) {
2599 memcpy(&addr, &pinfo->prefix, 8);
2600
2601 if (!ipv6_addr_any(&in6_dev->token)) {
2602 read_lock_bh(&in6_dev->lock);
2603 memcpy(addr.s6_addr + 8,
2604 in6_dev->token.s6_addr + 8, 8);
2605 read_unlock_bh(&in6_dev->lock);
2606 tokenized = true;
2607 } else if (is_addr_mode_generate_stable(in6_dev) &&
2608 !ipv6_generate_stable_address(&addr, 0,
2609 in6_dev)) {
2610 addr_flags |= IFA_F_STABLE_PRIVACY;
2611 goto ok;
2612 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2613 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2614 goto put;
2615 } else {
2616 dev_addr_generated = true;
2617 }
2618 goto ok;
2619 }
2620 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2621 pinfo->prefix_len);
2622 goto put;
2623
2624 ok:
2625 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2626 &addr, addr_type,
2627 addr_flags, sllao,
2628 tokenized, valid_lft,
2629 prefered_lft);
2630 if (err)
2631 goto put;
2632
2633 /* Ignore error case here because previous prefix add addr was
2634 * successful which will be notified.
2635 */
2636 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2637 addr_type, addr_flags, sllao,
2638 tokenized, valid_lft,
2639 prefered_lft,
2640 dev_addr_generated);
2641 }
2642 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2643 put:
2644 in6_dev_put(in6_dev);
2645 }
2646
2647 /*
2648 * Set destination address.
2649 * Special case for SIT interfaces where we create a new "virtual"
2650 * device.
2651 */
2652 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2653 {
2654 struct in6_ifreq ireq;
2655 struct net_device *dev;
2656 int err = -EINVAL;
2657
2658 rtnl_lock();
2659
2660 err = -EFAULT;
2661 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2662 goto err_exit;
2663
2664 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2665
2666 err = -ENODEV;
2667 if (!dev)
2668 goto err_exit;
2669
2670 #if IS_ENABLED(CONFIG_IPV6_SIT)
2671 if (dev->type == ARPHRD_SIT) {
2672 const struct net_device_ops *ops = dev->netdev_ops;
2673 struct ifreq ifr;
2674 struct ip_tunnel_parm p;
2675
2676 err = -EADDRNOTAVAIL;
2677 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2678 goto err_exit;
2679
2680 memset(&p, 0, sizeof(p));
2681 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2682 p.iph.saddr = 0;
2683 p.iph.version = 4;
2684 p.iph.ihl = 5;
2685 p.iph.protocol = IPPROTO_IPV6;
2686 p.iph.ttl = 64;
2687 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2688
2689 if (ops->ndo_do_ioctl) {
2690 mm_segment_t oldfs = get_fs();
2691
2692 set_fs(KERNEL_DS);
2693 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2694 set_fs(oldfs);
2695 } else
2696 err = -EOPNOTSUPP;
2697
2698 if (err == 0) {
2699 err = -ENOBUFS;
2700 dev = __dev_get_by_name(net, p.name);
2701 if (!dev)
2702 goto err_exit;
2703 err = dev_open(dev);
2704 }
2705 }
2706 #endif
2707
2708 err_exit:
2709 rtnl_unlock();
2710 return err;
2711 }
2712
2713 static int ipv6_mc_config(struct sock *sk, bool join,
2714 const struct in6_addr *addr, int ifindex)
2715 {
2716 int ret;
2717
2718 ASSERT_RTNL();
2719
2720 lock_sock(sk);
2721 if (join)
2722 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2723 else
2724 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2725 release_sock(sk);
2726
2727 return ret;
2728 }
2729
2730 /*
2731 * Manual configuration of address on an interface
2732 */
2733 static int inet6_addr_add(struct net *net, int ifindex,
2734 const struct in6_addr *pfx,
2735 const struct in6_addr *peer_pfx,
2736 unsigned int plen, __u32 ifa_flags,
2737 __u32 prefered_lft, __u32 valid_lft)
2738 {
2739 struct inet6_ifaddr *ifp;
2740 struct inet6_dev *idev;
2741 struct net_device *dev;
2742 unsigned long timeout;
2743 clock_t expires;
2744 int scope;
2745 u32 flags;
2746
2747 ASSERT_RTNL();
2748
2749 if (plen > 128)
2750 return -EINVAL;
2751
2752 /* check the lifetime */
2753 if (!valid_lft || prefered_lft > valid_lft)
2754 return -EINVAL;
2755
2756 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2757 return -EINVAL;
2758
2759 dev = __dev_get_by_index(net, ifindex);
2760 if (!dev)
2761 return -ENODEV;
2762
2763 idev = addrconf_add_dev(dev);
2764 if (IS_ERR(idev))
2765 return PTR_ERR(idev);
2766
2767 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2768 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2769 true, pfx, ifindex);
2770
2771 if (ret < 0)
2772 return ret;
2773 }
2774
2775 scope = ipv6_addr_scope(pfx);
2776
2777 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2778 if (addrconf_finite_timeout(timeout)) {
2779 expires = jiffies_to_clock_t(timeout * HZ);
2780 valid_lft = timeout;
2781 flags = RTF_EXPIRES;
2782 } else {
2783 expires = 0;
2784 flags = 0;
2785 ifa_flags |= IFA_F_PERMANENT;
2786 }
2787
2788 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2789 if (addrconf_finite_timeout(timeout)) {
2790 if (timeout == 0)
2791 ifa_flags |= IFA_F_DEPRECATED;
2792 prefered_lft = timeout;
2793 }
2794
2795 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2796 valid_lft, prefered_lft);
2797
2798 if (!IS_ERR(ifp)) {
2799 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2800 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2801 expires, flags);
2802 }
2803
2804 /*
2805 * Note that section 3.1 of RFC 4429 indicates
2806 * that the Optimistic flag should not be set for
2807 * manually configured addresses
2808 */
2809 addrconf_dad_start(ifp);
2810 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2811 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2812 true, jiffies);
2813 in6_ifa_put(ifp);
2814 addrconf_verify_rtnl();
2815 return 0;
2816 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2817 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2818 false, pfx, ifindex);
2819 }
2820
2821 return PTR_ERR(ifp);
2822 }
2823
2824 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2825 const struct in6_addr *pfx, unsigned int plen)
2826 {
2827 struct inet6_ifaddr *ifp;
2828 struct inet6_dev *idev;
2829 struct net_device *dev;
2830
2831 if (plen > 128)
2832 return -EINVAL;
2833
2834 dev = __dev_get_by_index(net, ifindex);
2835 if (!dev)
2836 return -ENODEV;
2837
2838 idev = __in6_dev_get(dev);
2839 if (!idev)
2840 return -ENXIO;
2841
2842 read_lock_bh(&idev->lock);
2843 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2844 if (ifp->prefix_len == plen &&
2845 ipv6_addr_equal(pfx, &ifp->addr)) {
2846 in6_ifa_hold(ifp);
2847 read_unlock_bh(&idev->lock);
2848
2849 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2850 (ifa_flags & IFA_F_MANAGETEMPADDR))
2851 manage_tempaddrs(idev, ifp, 0, 0, false,
2852 jiffies);
2853 ipv6_del_addr(ifp);
2854 addrconf_verify_rtnl();
2855 if (ipv6_addr_is_multicast(pfx)) {
2856 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2857 false, pfx, dev->ifindex);
2858 }
2859 return 0;
2860 }
2861 }
2862 read_unlock_bh(&idev->lock);
2863 return -EADDRNOTAVAIL;
2864 }
2865
2866
2867 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2868 {
2869 struct in6_ifreq ireq;
2870 int err;
2871
2872 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2873 return -EPERM;
2874
2875 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2876 return -EFAULT;
2877
2878 rtnl_lock();
2879 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2880 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2881 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2882 rtnl_unlock();
2883 return err;
2884 }
2885
2886 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2887 {
2888 struct in6_ifreq ireq;
2889 int err;
2890
2891 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2892 return -EPERM;
2893
2894 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2895 return -EFAULT;
2896
2897 rtnl_lock();
2898 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2899 ireq.ifr6_prefixlen);
2900 rtnl_unlock();
2901 return err;
2902 }
2903
2904 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2905 int plen, int scope)
2906 {
2907 struct inet6_ifaddr *ifp;
2908
2909 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2910 scope, IFA_F_PERMANENT,
2911 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2912 if (!IS_ERR(ifp)) {
2913 spin_lock_bh(&ifp->lock);
2914 ifp->flags &= ~IFA_F_TENTATIVE;
2915 spin_unlock_bh(&ifp->lock);
2916 rt_genid_bump_ipv6(dev_net(idev->dev));
2917 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2918 in6_ifa_put(ifp);
2919 }
2920 }
2921
2922 #if IS_ENABLED(CONFIG_IPV6_SIT)
2923 static void sit_add_v4_addrs(struct inet6_dev *idev)
2924 {
2925 struct in6_addr addr;
2926 struct net_device *dev;
2927 struct net *net = dev_net(idev->dev);
2928 int scope, plen;
2929 u32 pflags = 0;
2930
2931 ASSERT_RTNL();
2932
2933 memset(&addr, 0, sizeof(struct in6_addr));
2934 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2935
2936 if (idev->dev->flags&IFF_POINTOPOINT) {
2937 addr.s6_addr32[0] = htonl(0xfe800000);
2938 scope = IFA_LINK;
2939 plen = 64;
2940 } else {
2941 scope = IPV6_ADDR_COMPATv4;
2942 plen = 96;
2943 pflags |= RTF_NONEXTHOP;
2944 }
2945
2946 if (addr.s6_addr32[3]) {
2947 add_addr(idev, &addr, plen, scope);
2948 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2949 return;
2950 }
2951
2952 for_each_netdev(net, dev) {
2953 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2954 if (in_dev && (dev->flags & IFF_UP)) {
2955 struct in_ifaddr *ifa;
2956
2957 int flag = scope;
2958
2959 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2960
2961 addr.s6_addr32[3] = ifa->ifa_local;
2962
2963 if (ifa->ifa_scope == RT_SCOPE_LINK)
2964 continue;
2965 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2966 if (idev->dev->flags&IFF_POINTOPOINT)
2967 continue;
2968 flag |= IFA_HOST;
2969 }
2970
2971 add_addr(idev, &addr, plen, flag);
2972 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2973 pflags);
2974 }
2975 }
2976 }
2977 }
2978 #endif
2979
2980 static void init_loopback(struct net_device *dev)
2981 {
2982 struct inet6_dev *idev;
2983 struct net_device *sp_dev;
2984 struct inet6_ifaddr *sp_ifa;
2985 struct rt6_info *sp_rt;
2986
2987 /* ::1 */
2988
2989 ASSERT_RTNL();
2990
2991 idev = ipv6_find_idev(dev);
2992 if (!idev) {
2993 pr_debug("%s: add_dev failed\n", __func__);
2994 return;
2995 }
2996
2997 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2998
2999 /* Add routes to other interface's IPv6 addresses */
3000 for_each_netdev(dev_net(dev), sp_dev) {
3001 if (!strcmp(sp_dev->name, dev->name))
3002 continue;
3003
3004 idev = __in6_dev_get(sp_dev);
3005 if (!idev)
3006 continue;
3007
3008 read_lock_bh(&idev->lock);
3009 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3010
3011 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3012 continue;
3013
3014 if (sp_ifa->rt) {
3015 /* This dst has been added to garbage list when
3016 * lo device down, release this obsolete dst and
3017 * reallocate a new router for ifa.
3018 */
3019 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
3020 ip6_rt_put(sp_ifa->rt);
3021 sp_ifa->rt = NULL;
3022 } else {
3023 continue;
3024 }
3025 }
3026
3027 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3028
3029 /* Failure cases are ignored */
3030 if (!IS_ERR(sp_rt)) {
3031 sp_ifa->rt = sp_rt;
3032 ip6_ins_rt(sp_rt);
3033 }
3034 }
3035 read_unlock_bh(&idev->lock);
3036 }
3037 }
3038
3039 void addrconf_add_linklocal(struct inet6_dev *idev,
3040 const struct in6_addr *addr, u32 flags)
3041 {
3042 struct inet6_ifaddr *ifp;
3043 u32 addr_flags = flags | IFA_F_PERMANENT;
3044
3045 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3046 if (idev->cnf.optimistic_dad &&
3047 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3048 addr_flags |= IFA_F_OPTIMISTIC;
3049 #endif
3050
3051 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3052 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3053 if (!IS_ERR(ifp)) {
3054 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3055 addrconf_dad_start(ifp);
3056 in6_ifa_put(ifp);
3057 }
3058 }
3059 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3060
3061 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3062 {
3063 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3064 return true;
3065
3066 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3067 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3068 return true;
3069
3070 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3071 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3072 return true;
3073
3074 return false;
3075 }
3076
3077 static int ipv6_generate_stable_address(struct in6_addr *address,
3078 u8 dad_count,
3079 const struct inet6_dev *idev)
3080 {
3081 static DEFINE_SPINLOCK(lock);
3082 static __u32 digest[SHA_DIGEST_WORDS];
3083 static __u32 workspace[SHA_WORKSPACE_WORDS];
3084
3085 static union {
3086 char __data[SHA_MESSAGE_BYTES];
3087 struct {
3088 struct in6_addr secret;
3089 __be32 prefix[2];
3090 unsigned char hwaddr[MAX_ADDR_LEN];
3091 u8 dad_count;
3092 } __packed;
3093 } data;
3094
3095 struct in6_addr secret;
3096 struct in6_addr temp;
3097 struct net *net = dev_net(idev->dev);
3098
3099 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3100
3101 if (idev->cnf.stable_secret.initialized)
3102 secret = idev->cnf.stable_secret.secret;
3103 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3104 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3105 else
3106 return -1;
3107
3108 retry:
3109 spin_lock_bh(&lock);
3110
3111 sha_init(digest);
3112 memset(&data, 0, sizeof(data));
3113 memset(workspace, 0, sizeof(workspace));
3114 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3115 data.prefix[0] = address->s6_addr32[0];
3116 data.prefix[1] = address->s6_addr32[1];
3117 data.secret = secret;
3118 data.dad_count = dad_count;
3119
3120 sha_transform(digest, data.__data, workspace);
3121
3122 temp = *address;
3123 temp.s6_addr32[2] = (__force __be32)digest[0];
3124 temp.s6_addr32[3] = (__force __be32)digest[1];
3125
3126 spin_unlock_bh(&lock);
3127
3128 if (ipv6_reserved_interfaceid(temp)) {
3129 dad_count++;
3130 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3131 return -1;
3132 goto retry;
3133 }
3134
3135 *address = temp;
3136 return 0;
3137 }
3138
3139 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3140 {
3141 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3142
3143 if (s->initialized)
3144 return;
3145 s = &idev->cnf.stable_secret;
3146 get_random_bytes(&s->secret, sizeof(s->secret));
3147 s->initialized = true;
3148 }
3149
3150 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3151 {
3152 struct in6_addr addr;
3153
3154 /* no link local addresses on L3 master devices */
3155 if (netif_is_l3_master(idev->dev))
3156 return;
3157
3158 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3159
3160 switch (idev->cnf.addr_gen_mode) {
3161 case IN6_ADDR_GEN_MODE_RANDOM:
3162 ipv6_gen_mode_random_init(idev);
3163 /* fallthrough */
3164 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3165 if (!ipv6_generate_stable_address(&addr, 0, idev))
3166 addrconf_add_linklocal(idev, &addr,
3167 IFA_F_STABLE_PRIVACY);
3168 else if (prefix_route)
3169 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3170 break;
3171 case IN6_ADDR_GEN_MODE_EUI64:
3172 /* addrconf_add_linklocal also adds a prefix_route and we
3173 * only need to care about prefix routes if ipv6_generate_eui64
3174 * couldn't generate one.
3175 */
3176 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3177 addrconf_add_linklocal(idev, &addr, 0);
3178 else if (prefix_route)
3179 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3180 break;
3181 case IN6_ADDR_GEN_MODE_NONE:
3182 default:
3183 /* will not add any link local address */
3184 break;
3185 }
3186 }
3187
3188 static void addrconf_dev_config(struct net_device *dev)
3189 {
3190 struct inet6_dev *idev;
3191
3192 ASSERT_RTNL();
3193
3194 if ((dev->type != ARPHRD_ETHER) &&
3195 (dev->type != ARPHRD_FDDI) &&
3196 (dev->type != ARPHRD_ARCNET) &&
3197 (dev->type != ARPHRD_INFINIBAND) &&
3198 (dev->type != ARPHRD_IEEE1394) &&
3199 (dev->type != ARPHRD_TUNNEL6) &&
3200 (dev->type != ARPHRD_6LOWPAN) &&
3201 (dev->type != ARPHRD_IP6GRE) &&
3202 (dev->type != ARPHRD_IPGRE) &&
3203 (dev->type != ARPHRD_TUNNEL) &&
3204 (dev->type != ARPHRD_NONE)) {
3205 /* Alas, we support only Ethernet autoconfiguration. */
3206 return;
3207 }
3208
3209 idev = addrconf_add_dev(dev);
3210 if (IS_ERR(idev))
3211 return;
3212
3213 /* this device type has no EUI support */
3214 if (dev->type == ARPHRD_NONE &&
3215 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3216 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3217
3218 addrconf_addr_gen(idev, false);
3219 }
3220
3221 #if IS_ENABLED(CONFIG_IPV6_SIT)
3222 static void addrconf_sit_config(struct net_device *dev)
3223 {
3224 struct inet6_dev *idev;
3225
3226 ASSERT_RTNL();
3227
3228 /*
3229 * Configure the tunnel with one of our IPv4
3230 * addresses... we should configure all of
3231 * our v4 addrs in the tunnel
3232 */
3233
3234 idev = ipv6_find_idev(dev);
3235 if (!idev) {
3236 pr_debug("%s: add_dev failed\n", __func__);
3237 return;
3238 }
3239
3240 if (dev->priv_flags & IFF_ISATAP) {
3241 addrconf_addr_gen(idev, false);
3242 return;
3243 }
3244
3245 sit_add_v4_addrs(idev);
3246
3247 if (dev->flags&IFF_POINTOPOINT)
3248 addrconf_add_mroute(dev);
3249 }
3250 #endif
3251
3252 #if IS_ENABLED(CONFIG_NET_IPGRE)
3253 static void addrconf_gre_config(struct net_device *dev)
3254 {
3255 struct inet6_dev *idev;
3256
3257 ASSERT_RTNL();
3258
3259 idev = ipv6_find_idev(dev);
3260 if (!idev) {
3261 pr_debug("%s: add_dev failed\n", __func__);
3262 return;
3263 }
3264
3265 addrconf_addr_gen(idev, true);
3266 if (dev->flags & IFF_POINTOPOINT)
3267 addrconf_add_mroute(dev);
3268 }
3269 #endif
3270
3271 static int fixup_permanent_addr(struct inet6_dev *idev,
3272 struct inet6_ifaddr *ifp)
3273 {
3274 if (!ifp->rt) {
3275 struct rt6_info *rt;
3276
3277 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3278 if (unlikely(IS_ERR(rt)))
3279 return PTR_ERR(rt);
3280
3281 ifp->rt = rt;
3282 }
3283
3284 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3285 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3286 idev->dev, 0, 0);
3287 }
3288
3289 addrconf_dad_start(ifp);
3290
3291 return 0;
3292 }
3293
3294 static void addrconf_permanent_addr(struct net_device *dev)
3295 {
3296 struct inet6_ifaddr *ifp, *tmp;
3297 struct inet6_dev *idev;
3298
3299 idev = __in6_dev_get(dev);
3300 if (!idev)
3301 return;
3302
3303 write_lock_bh(&idev->lock);
3304
3305 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3306 if ((ifp->flags & IFA_F_PERMANENT) &&
3307 fixup_permanent_addr(idev, ifp) < 0) {
3308 write_unlock_bh(&idev->lock);
3309 ipv6_del_addr(ifp);
3310 write_lock_bh(&idev->lock);
3311
3312 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3313 idev->dev->name, &ifp->addr);
3314 }
3315 }
3316
3317 write_unlock_bh(&idev->lock);
3318 }
3319
3320 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3321 void *ptr)
3322 {
3323 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3324 struct netdev_notifier_changeupper_info *info;
3325 struct inet6_dev *idev = __in6_dev_get(dev);
3326 int run_pending = 0;
3327 int err;
3328
3329 switch (event) {
3330 case NETDEV_REGISTER:
3331 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3332 idev = ipv6_add_dev(dev);
3333 if (IS_ERR(idev))
3334 return notifier_from_errno(PTR_ERR(idev));
3335 }
3336 break;
3337
3338 case NETDEV_CHANGEMTU:
3339 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3340 if (dev->mtu < IPV6_MIN_MTU) {
3341 addrconf_ifdown(dev, 1);
3342 break;
3343 }
3344
3345 if (idev) {
3346 rt6_mtu_change(dev, dev->mtu);
3347 idev->cnf.mtu6 = dev->mtu;
3348 break;
3349 }
3350
3351 /* allocate new idev */
3352 idev = ipv6_add_dev(dev);
3353 if (IS_ERR(idev))
3354 break;
3355
3356 /* device is still not ready */
3357 if (!(idev->if_flags & IF_READY))
3358 break;
3359
3360 run_pending = 1;
3361
3362 /* fall through */
3363
3364 case NETDEV_UP:
3365 case NETDEV_CHANGE:
3366 if (dev->flags & IFF_SLAVE)
3367 break;
3368
3369 if (idev && idev->cnf.disable_ipv6)
3370 break;
3371
3372 if (event == NETDEV_UP) {
3373 /* restore routes for permanent addresses */
3374 addrconf_permanent_addr(dev);
3375
3376 if (!addrconf_qdisc_ok(dev)) {
3377 /* device is not ready yet. */
3378 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3379 dev->name);
3380 break;
3381 }
3382
3383 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3384 idev = ipv6_add_dev(dev);
3385
3386 if (!IS_ERR_OR_NULL(idev)) {
3387 idev->if_flags |= IF_READY;
3388 run_pending = 1;
3389 }
3390 } else if (event == NETDEV_CHANGE) {
3391 if (!addrconf_qdisc_ok(dev)) {
3392 /* device is still not ready. */
3393 break;
3394 }
3395
3396 if (idev) {
3397 if (idev->if_flags & IF_READY) {
3398 /* device is already configured -
3399 * but resend MLD reports, we might
3400 * have roamed and need to update
3401 * multicast snooping switches
3402 */
3403 ipv6_mc_up(idev);
3404 break;
3405 }
3406 idev->if_flags |= IF_READY;
3407 }
3408
3409 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3410 dev->name);
3411
3412 run_pending = 1;
3413 }
3414
3415 switch (dev->type) {
3416 #if IS_ENABLED(CONFIG_IPV6_SIT)
3417 case ARPHRD_SIT:
3418 addrconf_sit_config(dev);
3419 break;
3420 #endif
3421 #if IS_ENABLED(CONFIG_NET_IPGRE)
3422 case ARPHRD_IPGRE:
3423 addrconf_gre_config(dev);
3424 break;
3425 #endif
3426 case ARPHRD_LOOPBACK:
3427 init_loopback(dev);
3428 break;
3429
3430 default:
3431 addrconf_dev_config(dev);
3432 break;
3433 }
3434
3435 if (!IS_ERR_OR_NULL(idev)) {
3436 if (run_pending)
3437 addrconf_dad_run(idev);
3438
3439 /*
3440 * If the MTU changed during the interface down,
3441 * when the interface up, the changed MTU must be
3442 * reflected in the idev as well as routers.
3443 */
3444 if (idev->cnf.mtu6 != dev->mtu &&
3445 dev->mtu >= IPV6_MIN_MTU) {
3446 rt6_mtu_change(dev, dev->mtu);
3447 idev->cnf.mtu6 = dev->mtu;
3448 }
3449 idev->tstamp = jiffies;
3450 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3451
3452 /*
3453 * If the changed mtu during down is lower than
3454 * IPV6_MIN_MTU stop IPv6 on this interface.
3455 */
3456 if (dev->mtu < IPV6_MIN_MTU)
3457 addrconf_ifdown(dev, 1);
3458 }
3459 break;
3460
3461 case NETDEV_DOWN:
3462 case NETDEV_UNREGISTER:
3463 /*
3464 * Remove all addresses from this interface.
3465 */
3466 addrconf_ifdown(dev, event != NETDEV_DOWN);
3467 break;
3468
3469 case NETDEV_CHANGENAME:
3470 if (idev) {
3471 snmp6_unregister_dev(idev);
3472 addrconf_sysctl_unregister(idev);
3473 err = addrconf_sysctl_register(idev);
3474 if (err)
3475 return notifier_from_errno(err);
3476 err = snmp6_register_dev(idev);
3477 if (err) {
3478 addrconf_sysctl_unregister(idev);
3479 return notifier_from_errno(err);
3480 }
3481 }
3482 break;
3483
3484 case NETDEV_PRE_TYPE_CHANGE:
3485 case NETDEV_POST_TYPE_CHANGE:
3486 if (idev)
3487 addrconf_type_change(dev, event);
3488 break;
3489
3490 case NETDEV_CHANGEUPPER:
3491 info = ptr;
3492
3493 /* flush all routes if dev is linked to or unlinked from
3494 * an L3 master device (e.g., VRF)
3495 */
3496 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3497 addrconf_ifdown(dev, 0);
3498 }
3499
3500 return NOTIFY_OK;
3501 }
3502
3503 /*
3504 * addrconf module should be notified of a device going up
3505 */
3506 static struct notifier_block ipv6_dev_notf = {
3507 .notifier_call = addrconf_notify,
3508 };
3509
3510 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3511 {
3512 struct inet6_dev *idev;
3513 ASSERT_RTNL();
3514
3515 idev = __in6_dev_get(dev);
3516
3517 if (event == NETDEV_POST_TYPE_CHANGE)
3518 ipv6_mc_remap(idev);
3519 else if (event == NETDEV_PRE_TYPE_CHANGE)
3520 ipv6_mc_unmap(idev);
3521 }
3522
3523 static bool addr_is_local(const struct in6_addr *addr)
3524 {
3525 return ipv6_addr_type(addr) &
3526 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3527 }
3528
3529 static int addrconf_ifdown(struct net_device *dev, int how)
3530 {
3531 struct net *net = dev_net(dev);
3532 struct inet6_dev *idev;
3533 struct inet6_ifaddr *ifa, *tmp;
3534 struct list_head del_list;
3535 int _keep_addr;
3536 bool keep_addr;
3537 int state, i;
3538
3539 ASSERT_RTNL();
3540
3541 rt6_ifdown(net, dev);
3542 neigh_ifdown(&nd_tbl, dev);
3543
3544 idev = __in6_dev_get(dev);
3545 if (!idev)
3546 return -ENODEV;
3547
3548 /*
3549 * Step 1: remove reference to ipv6 device from parent device.
3550 * Do not dev_put!
3551 */
3552 if (how) {
3553 idev->dead = 1;
3554
3555 /* protected by rtnl_lock */
3556 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3557
3558 /* Step 1.5: remove snmp6 entry */
3559 snmp6_unregister_dev(idev);
3560
3561 }
3562
3563 /* aggregate the system setting and interface setting */
3564 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3565 if (!_keep_addr)
3566 _keep_addr = idev->cnf.keep_addr_on_down;
3567
3568 /* combine the user config with event to determine if permanent
3569 * addresses are to be removed from address hash table
3570 */
3571 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3572
3573 /* Step 2: clear hash table */
3574 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3575 struct hlist_head *h = &inet6_addr_lst[i];
3576
3577 spin_lock_bh(&addrconf_hash_lock);
3578 restart:
3579 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3580 if (ifa->idev == idev) {
3581 addrconf_del_dad_work(ifa);
3582 /* combined flag + permanent flag decide if
3583 * address is retained on a down event
3584 */
3585 if (!keep_addr ||
3586 !(ifa->flags & IFA_F_PERMANENT) ||
3587 addr_is_local(&ifa->addr)) {
3588 hlist_del_init_rcu(&ifa->addr_lst);
3589 goto restart;
3590 }
3591 }
3592 }
3593 spin_unlock_bh(&addrconf_hash_lock);
3594 }
3595
3596 write_lock_bh(&idev->lock);
3597
3598 addrconf_del_rs_timer(idev);
3599
3600 /* Step 2: clear flags for stateless addrconf */
3601 if (!how)
3602 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3603
3604 /* Step 3: clear tempaddr list */
3605 while (!list_empty(&idev->tempaddr_list)) {
3606 ifa = list_first_entry(&idev->tempaddr_list,
3607 struct inet6_ifaddr, tmp_list);
3608 list_del(&ifa->tmp_list);
3609 write_unlock_bh(&idev->lock);
3610 spin_lock_bh(&ifa->lock);
3611
3612 if (ifa->ifpub) {
3613 in6_ifa_put(ifa->ifpub);
3614 ifa->ifpub = NULL;
3615 }
3616 spin_unlock_bh(&ifa->lock);
3617 in6_ifa_put(ifa);
3618 write_lock_bh(&idev->lock);
3619 }
3620
3621 /* re-combine the user config with event to determine if permanent
3622 * addresses are to be removed from the interface list
3623 */
3624 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3625
3626 INIT_LIST_HEAD(&del_list);
3627 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3628 struct rt6_info *rt = NULL;
3629
3630 addrconf_del_dad_work(ifa);
3631
3632 write_unlock_bh(&idev->lock);
3633 spin_lock_bh(&ifa->lock);
3634
3635 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3636 !addr_is_local(&ifa->addr)) {
3637 /* set state to skip the notifier below */
3638 state = INET6_IFADDR_STATE_DEAD;
3639 ifa->state = 0;
3640 if (!(ifa->flags & IFA_F_NODAD))
3641 ifa->flags |= IFA_F_TENTATIVE;
3642
3643 rt = ifa->rt;
3644 ifa->rt = NULL;
3645 } else {
3646 state = ifa->state;
3647 ifa->state = INET6_IFADDR_STATE_DEAD;
3648
3649 list_move(&ifa->if_list, &del_list);
3650 }
3651
3652 spin_unlock_bh(&ifa->lock);
3653
3654 if (rt)
3655 ip6_del_rt(rt);
3656
3657 if (state != INET6_IFADDR_STATE_DEAD) {
3658 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3659 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3660 } else {
3661 if (idev->cnf.forwarding)
3662 addrconf_leave_anycast(ifa);
3663 addrconf_leave_solict(ifa->idev, &ifa->addr);
3664 }
3665
3666 write_lock_bh(&idev->lock);
3667 }
3668
3669 write_unlock_bh(&idev->lock);
3670
3671 /* now clean up addresses to be removed */
3672 while (!list_empty(&del_list)) {
3673 ifa = list_first_entry(&del_list,
3674 struct inet6_ifaddr, if_list);
3675 list_del(&ifa->if_list);
3676
3677 in6_ifa_put(ifa);
3678 }
3679
3680 /* Step 5: Discard anycast and multicast list */
3681 if (how) {
3682 ipv6_ac_destroy_dev(idev);
3683 ipv6_mc_destroy_dev(idev);
3684 } else {
3685 ipv6_mc_down(idev);
3686 }
3687
3688 idev->tstamp = jiffies;
3689
3690 /* Last: Shot the device (if unregistered) */
3691 if (how) {
3692 addrconf_sysctl_unregister(idev);
3693 neigh_parms_release(&nd_tbl, idev->nd_parms);
3694 neigh_ifdown(&nd_tbl, dev);
3695 in6_dev_put(idev);
3696 }
3697 return 0;
3698 }
3699
3700 static void addrconf_rs_timer(unsigned long data)
3701 {
3702 struct inet6_dev *idev = (struct inet6_dev *)data;
3703 struct net_device *dev = idev->dev;
3704 struct in6_addr lladdr;
3705
3706 write_lock(&idev->lock);
3707 if (idev->dead || !(idev->if_flags & IF_READY))
3708 goto out;
3709
3710 if (!ipv6_accept_ra(idev))
3711 goto out;
3712
3713 /* Announcement received after solicitation was sent */
3714 if (idev->if_flags & IF_RA_RCVD)
3715 goto out;
3716
3717 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3718 write_unlock(&idev->lock);
3719 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3720 ndisc_send_rs(dev, &lladdr,
3721 &in6addr_linklocal_allrouters);
3722 else
3723 goto put;
3724
3725 write_lock(&idev->lock);
3726 idev->rs_interval = rfc3315_s14_backoff_update(
3727 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3728 /* The wait after the last probe can be shorter */
3729 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3730 idev->cnf.rtr_solicits) ?
3731 idev->cnf.rtr_solicit_delay :
3732 idev->rs_interval);
3733 } else {
3734 /*
3735 * Note: we do not support deprecated "all on-link"
3736 * assumption any longer.
3737 */
3738 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3739 }
3740
3741 out:
3742 write_unlock(&idev->lock);
3743 put:
3744 in6_dev_put(idev);
3745 }
3746
3747 /*
3748 * Duplicate Address Detection
3749 */
3750 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3751 {
3752 unsigned long rand_num;
3753 struct inet6_dev *idev = ifp->idev;
3754 u64 nonce;
3755
3756 if (ifp->flags & IFA_F_OPTIMISTIC)
3757 rand_num = 0;
3758 else
3759 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3760
3761 nonce = 0;
3762 if (idev->cnf.enhanced_dad ||
3763 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3764 do
3765 get_random_bytes(&nonce, 6);
3766 while (nonce == 0);
3767 }
3768 ifp->dad_nonce = nonce;
3769 ifp->dad_probes = idev->cnf.dad_transmits;
3770 addrconf_mod_dad_work(ifp, rand_num);
3771 }
3772
3773 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3774 {
3775 struct inet6_dev *idev = ifp->idev;
3776 struct net_device *dev = idev->dev;
3777 bool bump_id, notify = false;
3778
3779 addrconf_join_solict(dev, &ifp->addr);
3780
3781 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3782
3783 read_lock_bh(&idev->lock);
3784 spin_lock(&ifp->lock);
3785 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3786 goto out;
3787
3788 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3789 idev->cnf.accept_dad < 1 ||
3790 !(ifp->flags&IFA_F_TENTATIVE) ||
3791 ifp->flags & IFA_F_NODAD) {
3792 bump_id = ifp->flags & IFA_F_TENTATIVE;
3793 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3794 spin_unlock(&ifp->lock);
3795 read_unlock_bh(&idev->lock);
3796
3797 addrconf_dad_completed(ifp, bump_id);
3798 return;
3799 }
3800
3801 if (!(idev->if_flags & IF_READY)) {
3802 spin_unlock(&ifp->lock);
3803 read_unlock_bh(&idev->lock);
3804 /*
3805 * If the device is not ready:
3806 * - keep it tentative if it is a permanent address.
3807 * - otherwise, kill it.
3808 */
3809 in6_ifa_hold(ifp);
3810 addrconf_dad_stop(ifp, 0);
3811 return;
3812 }
3813
3814 /*
3815 * Optimistic nodes can start receiving
3816 * Frames right away
3817 */
3818 if (ifp->flags & IFA_F_OPTIMISTIC) {
3819 ip6_ins_rt(ifp->rt);
3820 if (ipv6_use_optimistic_addr(idev)) {
3821 /* Because optimistic nodes can use this address,
3822 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3823 */
3824 notify = true;
3825 }
3826 }
3827
3828 addrconf_dad_kick(ifp);
3829 out:
3830 spin_unlock(&ifp->lock);
3831 read_unlock_bh(&idev->lock);
3832 if (notify)
3833 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3834 }
3835
3836 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3837 {
3838 bool begin_dad = false;
3839
3840 spin_lock_bh(&ifp->lock);
3841 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3842 ifp->state = INET6_IFADDR_STATE_PREDAD;
3843 begin_dad = true;
3844 }
3845 spin_unlock_bh(&ifp->lock);
3846
3847 if (begin_dad)
3848 addrconf_mod_dad_work(ifp, 0);
3849 }
3850
3851 static void addrconf_dad_work(struct work_struct *w)
3852 {
3853 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3854 struct inet6_ifaddr,
3855 dad_work);
3856 struct inet6_dev *idev = ifp->idev;
3857 bool bump_id, disable_ipv6 = false;
3858 struct in6_addr mcaddr;
3859
3860 enum {
3861 DAD_PROCESS,
3862 DAD_BEGIN,
3863 DAD_ABORT,
3864 } action = DAD_PROCESS;
3865
3866 rtnl_lock();
3867
3868 spin_lock_bh(&ifp->lock);
3869 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3870 action = DAD_BEGIN;
3871 ifp->state = INET6_IFADDR_STATE_DAD;
3872 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3873 action = DAD_ABORT;
3874 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3875
3876 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3877 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3878 struct in6_addr addr;
3879
3880 addr.s6_addr32[0] = htonl(0xfe800000);
3881 addr.s6_addr32[1] = 0;
3882
3883 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3884 ipv6_addr_equal(&ifp->addr, &addr)) {
3885 /* DAD failed for link-local based on MAC */
3886 idev->cnf.disable_ipv6 = 1;
3887
3888 pr_info("%s: IPv6 being disabled!\n",
3889 ifp->idev->dev->name);
3890 disable_ipv6 = true;
3891 }
3892 }
3893 }
3894 spin_unlock_bh(&ifp->lock);
3895
3896 if (action == DAD_BEGIN) {
3897 addrconf_dad_begin(ifp);
3898 goto out;
3899 } else if (action == DAD_ABORT) {
3900 in6_ifa_hold(ifp);
3901 addrconf_dad_stop(ifp, 1);
3902 if (disable_ipv6)
3903 addrconf_ifdown(idev->dev, 0);
3904 goto out;
3905 }
3906
3907 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3908 goto out;
3909
3910 write_lock_bh(&idev->lock);
3911 if (idev->dead || !(idev->if_flags & IF_READY)) {
3912 write_unlock_bh(&idev->lock);
3913 goto out;
3914 }
3915
3916 spin_lock(&ifp->lock);
3917 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3918 spin_unlock(&ifp->lock);
3919 write_unlock_bh(&idev->lock);
3920 goto out;
3921 }
3922
3923 if (ifp->dad_probes == 0) {
3924 /*
3925 * DAD was successful
3926 */
3927
3928 bump_id = ifp->flags & IFA_F_TENTATIVE;
3929 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3930 spin_unlock(&ifp->lock);
3931 write_unlock_bh(&idev->lock);
3932
3933 addrconf_dad_completed(ifp, bump_id);
3934
3935 goto out;
3936 }
3937
3938 ifp->dad_probes--;
3939 addrconf_mod_dad_work(ifp,
3940 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3941 spin_unlock(&ifp->lock);
3942 write_unlock_bh(&idev->lock);
3943
3944 /* send a neighbour solicitation for our addr */
3945 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3946 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3947 ifp->dad_nonce);
3948 out:
3949 in6_ifa_put(ifp);
3950 rtnl_unlock();
3951 }
3952
3953 /* ifp->idev must be at least read locked */
3954 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3955 {
3956 struct inet6_ifaddr *ifpiter;
3957 struct inet6_dev *idev = ifp->idev;
3958
3959 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3960 if (ifpiter->scope > IFA_LINK)
3961 break;
3962 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3963 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3964 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3965 IFA_F_PERMANENT)
3966 return false;
3967 }
3968 return true;
3969 }
3970
3971 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
3972 {
3973 struct net_device *dev = ifp->idev->dev;
3974 struct in6_addr lladdr;
3975 bool send_rs, send_mld;
3976
3977 addrconf_del_dad_work(ifp);
3978
3979 /*
3980 * Configure the address for reception. Now it is valid.
3981 */
3982
3983 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3984
3985 /* If added prefix is link local and we are prepared to process
3986 router advertisements, start sending router solicitations.
3987 */
3988
3989 read_lock_bh(&ifp->idev->lock);
3990 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3991 send_rs = send_mld &&
3992 ipv6_accept_ra(ifp->idev) &&
3993 ifp->idev->cnf.rtr_solicits != 0 &&
3994 (dev->flags&IFF_LOOPBACK) == 0;
3995 read_unlock_bh(&ifp->idev->lock);
3996
3997 /* While dad is in progress mld report's source address is in6_addrany.
3998 * Resend with proper ll now.
3999 */
4000 if (send_mld)
4001 ipv6_mc_dad_complete(ifp->idev);
4002
4003 if (send_rs) {
4004 /*
4005 * If a host as already performed a random delay
4006 * [...] as part of DAD [...] there is no need
4007 * to delay again before sending the first RS
4008 */
4009 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4010 return;
4011 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4012
4013 write_lock_bh(&ifp->idev->lock);
4014 spin_lock(&ifp->lock);
4015 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4016 ifp->idev->cnf.rtr_solicit_interval);
4017 ifp->idev->rs_probes = 1;
4018 ifp->idev->if_flags |= IF_RS_SENT;
4019 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4020 spin_unlock(&ifp->lock);
4021 write_unlock_bh(&ifp->idev->lock);
4022 }
4023
4024 if (bump_id)
4025 rt_genid_bump_ipv6(dev_net(dev));
4026
4027 /* Make sure that a new temporary address will be created
4028 * before this temporary address becomes deprecated.
4029 */
4030 if (ifp->flags & IFA_F_TEMPORARY)
4031 addrconf_verify_rtnl();
4032 }
4033
4034 static void addrconf_dad_run(struct inet6_dev *idev)
4035 {
4036 struct inet6_ifaddr *ifp;
4037
4038 read_lock_bh(&idev->lock);
4039 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4040 spin_lock(&ifp->lock);
4041 if (ifp->flags & IFA_F_TENTATIVE &&
4042 ifp->state == INET6_IFADDR_STATE_DAD)
4043 addrconf_dad_kick(ifp);
4044 spin_unlock(&ifp->lock);
4045 }
4046 read_unlock_bh(&idev->lock);
4047 }
4048
4049 #ifdef CONFIG_PROC_FS
4050 struct if6_iter_state {
4051 struct seq_net_private p;
4052 int bucket;
4053 int offset;
4054 };
4055
4056 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4057 {
4058 struct inet6_ifaddr *ifa = NULL;
4059 struct if6_iter_state *state = seq->private;
4060 struct net *net = seq_file_net(seq);
4061 int p = 0;
4062
4063 /* initial bucket if pos is 0 */
4064 if (pos == 0) {
4065 state->bucket = 0;
4066 state->offset = 0;
4067 }
4068
4069 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4070 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4071 addr_lst) {
4072 if (!net_eq(dev_net(ifa->idev->dev), net))
4073 continue;
4074 /* sync with offset */
4075 if (p < state->offset) {
4076 p++;
4077 continue;
4078 }
4079 state->offset++;
4080 return ifa;
4081 }
4082
4083 /* prepare for next bucket */
4084 state->offset = 0;
4085 p = 0;
4086 }
4087 return NULL;
4088 }
4089
4090 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4091 struct inet6_ifaddr *ifa)
4092 {
4093 struct if6_iter_state *state = seq->private;
4094 struct net *net = seq_file_net(seq);
4095
4096 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4097 if (!net_eq(dev_net(ifa->idev->dev), net))
4098 continue;
4099 state->offset++;
4100 return ifa;
4101 }
4102
4103 while (++state->bucket < IN6_ADDR_HSIZE) {
4104 state->offset = 0;
4105 hlist_for_each_entry_rcu_bh(ifa,
4106 &inet6_addr_lst[state->bucket], addr_lst) {
4107 if (!net_eq(dev_net(ifa->idev->dev), net))
4108 continue;
4109 state->offset++;
4110 return ifa;
4111 }
4112 }
4113
4114 return NULL;
4115 }
4116
4117 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4118 __acquires(rcu_bh)
4119 {
4120 rcu_read_lock_bh();
4121 return if6_get_first(seq, *pos);
4122 }
4123
4124 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4125 {
4126 struct inet6_ifaddr *ifa;
4127
4128 ifa = if6_get_next(seq, v);
4129 ++*pos;
4130 return ifa;
4131 }
4132
4133 static void if6_seq_stop(struct seq_file *seq, void *v)
4134 __releases(rcu_bh)
4135 {
4136 rcu_read_unlock_bh();
4137 }
4138
4139 static int if6_seq_show(struct seq_file *seq, void *v)
4140 {
4141 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4142 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4143 &ifp->addr,
4144 ifp->idev->dev->ifindex,
4145 ifp->prefix_len,
4146 ifp->scope,
4147 (u8) ifp->flags,
4148 ifp->idev->dev->name);
4149 return 0;
4150 }
4151
4152 static const struct seq_operations if6_seq_ops = {
4153 .start = if6_seq_start,
4154 .next = if6_seq_next,
4155 .show = if6_seq_show,
4156 .stop = if6_seq_stop,
4157 };
4158
4159 static int if6_seq_open(struct inode *inode, struct file *file)
4160 {
4161 return seq_open_net(inode, file, &if6_seq_ops,
4162 sizeof(struct if6_iter_state));
4163 }
4164
4165 static const struct file_operations if6_fops = {
4166 .owner = THIS_MODULE,
4167 .open = if6_seq_open,
4168 .read = seq_read,
4169 .llseek = seq_lseek,
4170 .release = seq_release_net,
4171 };
4172
4173 static int __net_init if6_proc_net_init(struct net *net)
4174 {
4175 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4176 return -ENOMEM;
4177 return 0;
4178 }
4179
4180 static void __net_exit if6_proc_net_exit(struct net *net)
4181 {
4182 remove_proc_entry("if_inet6", net->proc_net);
4183 }
4184
4185 static struct pernet_operations if6_proc_net_ops = {
4186 .init = if6_proc_net_init,
4187 .exit = if6_proc_net_exit,
4188 };
4189
4190 int __init if6_proc_init(void)
4191 {
4192 return register_pernet_subsys(&if6_proc_net_ops);
4193 }
4194
4195 void if6_proc_exit(void)
4196 {
4197 unregister_pernet_subsys(&if6_proc_net_ops);
4198 }
4199 #endif /* CONFIG_PROC_FS */
4200
4201 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4202 /* Check if address is a home address configured on any interface. */
4203 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4204 {
4205 int ret = 0;
4206 struct inet6_ifaddr *ifp = NULL;
4207 unsigned int hash = inet6_addr_hash(addr);
4208
4209 rcu_read_lock_bh();
4210 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4211 if (!net_eq(dev_net(ifp->idev->dev), net))
4212 continue;
4213 if (ipv6_addr_equal(&ifp->addr, addr) &&
4214 (ifp->flags & IFA_F_HOMEADDRESS)) {
4215 ret = 1;
4216 break;
4217 }
4218 }
4219 rcu_read_unlock_bh();
4220 return ret;
4221 }
4222 #endif
4223
4224 /*
4225 * Periodic address status verification
4226 */
4227
4228 static void addrconf_verify_rtnl(void)
4229 {
4230 unsigned long now, next, next_sec, next_sched;
4231 struct inet6_ifaddr *ifp;
4232 int i;
4233
4234 ASSERT_RTNL();
4235
4236 rcu_read_lock_bh();
4237 now = jiffies;
4238 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4239
4240 cancel_delayed_work(&addr_chk_work);
4241
4242 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4243 restart:
4244 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4245 unsigned long age;
4246
4247 /* When setting preferred_lft to a value not zero or
4248 * infinity, while valid_lft is infinity
4249 * IFA_F_PERMANENT has a non-infinity life time.
4250 */
4251 if ((ifp->flags & IFA_F_PERMANENT) &&
4252 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4253 continue;
4254
4255 spin_lock(&ifp->lock);
4256 /* We try to batch several events at once. */
4257 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4258
4259 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4260 age >= ifp->valid_lft) {
4261 spin_unlock(&ifp->lock);
4262 in6_ifa_hold(ifp);
4263 ipv6_del_addr(ifp);
4264 goto restart;
4265 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4266 spin_unlock(&ifp->lock);
4267 continue;
4268 } else if (age >= ifp->prefered_lft) {
4269 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4270 int deprecate = 0;
4271
4272 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4273 deprecate = 1;
4274 ifp->flags |= IFA_F_DEPRECATED;
4275 }
4276
4277 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4278 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4279 next = ifp->tstamp + ifp->valid_lft * HZ;
4280
4281 spin_unlock(&ifp->lock);
4282
4283 if (deprecate) {
4284 in6_ifa_hold(ifp);
4285
4286 ipv6_ifa_notify(0, ifp);
4287 in6_ifa_put(ifp);
4288 goto restart;
4289 }
4290 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4291 !(ifp->flags&IFA_F_TENTATIVE)) {
4292 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4293 ifp->idev->cnf.dad_transmits *
4294 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4295
4296 if (age >= ifp->prefered_lft - regen_advance) {
4297 struct inet6_ifaddr *ifpub = ifp->ifpub;
4298 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4299 next = ifp->tstamp + ifp->prefered_lft * HZ;
4300 if (!ifp->regen_count && ifpub) {
4301 ifp->regen_count++;
4302 in6_ifa_hold(ifp);
4303 in6_ifa_hold(ifpub);
4304 spin_unlock(&ifp->lock);
4305
4306 spin_lock(&ifpub->lock);
4307 ifpub->regen_count = 0;
4308 spin_unlock(&ifpub->lock);
4309 ipv6_create_tempaddr(ifpub, ifp);
4310 in6_ifa_put(ifpub);
4311 in6_ifa_put(ifp);
4312 goto restart;
4313 }
4314 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4315 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4316 spin_unlock(&ifp->lock);
4317 } else {
4318 /* ifp->prefered_lft <= ifp->valid_lft */
4319 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4320 next = ifp->tstamp + ifp->prefered_lft * HZ;
4321 spin_unlock(&ifp->lock);
4322 }
4323 }
4324 }
4325
4326 next_sec = round_jiffies_up(next);
4327 next_sched = next;
4328
4329 /* If rounded timeout is accurate enough, accept it. */
4330 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4331 next_sched = next_sec;
4332
4333 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4334 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4335 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4336
4337 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4338 now, next, next_sec, next_sched);
4339 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4340 rcu_read_unlock_bh();
4341 }
4342
4343 static void addrconf_verify_work(struct work_struct *w)
4344 {
4345 rtnl_lock();
4346 addrconf_verify_rtnl();
4347 rtnl_unlock();
4348 }
4349
4350 static void addrconf_verify(void)
4351 {
4352 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4353 }
4354
4355 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4356 struct in6_addr **peer_pfx)
4357 {
4358 struct in6_addr *pfx = NULL;
4359
4360 *peer_pfx = NULL;
4361
4362 if (addr)
4363 pfx = nla_data(addr);
4364
4365 if (local) {
4366 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4367 *peer_pfx = pfx;
4368 pfx = nla_data(local);
4369 }
4370
4371 return pfx;
4372 }
4373
4374 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4375 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4376 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4377 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4378 [IFA_FLAGS] = { .len = sizeof(u32) },
4379 };
4380
4381 static int
4382 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4383 {
4384 struct net *net = sock_net(skb->sk);
4385 struct ifaddrmsg *ifm;
4386 struct nlattr *tb[IFA_MAX+1];
4387 struct in6_addr *pfx, *peer_pfx;
4388 u32 ifa_flags;
4389 int err;
4390
4391 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4392 if (err < 0)
4393 return err;
4394
4395 ifm = nlmsg_data(nlh);
4396 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4397 if (!pfx)
4398 return -EINVAL;
4399
4400 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4401
4402 /* We ignore other flags so far. */
4403 ifa_flags &= IFA_F_MANAGETEMPADDR;
4404
4405 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4406 ifm->ifa_prefixlen);
4407 }
4408
4409 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4410 u32 prefered_lft, u32 valid_lft)
4411 {
4412 u32 flags;
4413 clock_t expires;
4414 unsigned long timeout;
4415 bool was_managetempaddr;
4416 bool had_prefixroute;
4417
4418 ASSERT_RTNL();
4419
4420 if (!valid_lft || (prefered_lft > valid_lft))
4421 return -EINVAL;
4422
4423 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4424 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4425 return -EINVAL;
4426
4427 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4428 if (addrconf_finite_timeout(timeout)) {
4429 expires = jiffies_to_clock_t(timeout * HZ);
4430 valid_lft = timeout;
4431 flags = RTF_EXPIRES;
4432 } else {
4433 expires = 0;
4434 flags = 0;
4435 ifa_flags |= IFA_F_PERMANENT;
4436 }
4437
4438 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4439 if (addrconf_finite_timeout(timeout)) {
4440 if (timeout == 0)
4441 ifa_flags |= IFA_F_DEPRECATED;
4442 prefered_lft = timeout;
4443 }
4444
4445 spin_lock_bh(&ifp->lock);
4446 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4447 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4448 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4449 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4450 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4451 IFA_F_NOPREFIXROUTE);
4452 ifp->flags |= ifa_flags;
4453 ifp->tstamp = jiffies;
4454 ifp->valid_lft = valid_lft;
4455 ifp->prefered_lft = prefered_lft;
4456
4457 spin_unlock_bh(&ifp->lock);
4458 if (!(ifp->flags&IFA_F_TENTATIVE))
4459 ipv6_ifa_notify(0, ifp);
4460
4461 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4462 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4463 expires, flags);
4464 } else if (had_prefixroute) {
4465 enum cleanup_prefix_rt_t action;
4466 unsigned long rt_expires;
4467
4468 write_lock_bh(&ifp->idev->lock);
4469 action = check_cleanup_prefix_route(ifp, &rt_expires);
4470 write_unlock_bh(&ifp->idev->lock);
4471
4472 if (action != CLEANUP_PREFIX_RT_NOP) {
4473 cleanup_prefix_route(ifp, rt_expires,
4474 action == CLEANUP_PREFIX_RT_DEL);
4475 }
4476 }
4477
4478 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4479 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4480 valid_lft = prefered_lft = 0;
4481 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4482 !was_managetempaddr, jiffies);
4483 }
4484
4485 addrconf_verify_rtnl();
4486
4487 return 0;
4488 }
4489
4490 static int
4491 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4492 {
4493 struct net *net = sock_net(skb->sk);
4494 struct ifaddrmsg *ifm;
4495 struct nlattr *tb[IFA_MAX+1];
4496 struct in6_addr *pfx, *peer_pfx;
4497 struct inet6_ifaddr *ifa;
4498 struct net_device *dev;
4499 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4500 u32 ifa_flags;
4501 int err;
4502
4503 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4504 if (err < 0)
4505 return err;
4506
4507 ifm = nlmsg_data(nlh);
4508 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4509 if (!pfx)
4510 return -EINVAL;
4511
4512 if (tb[IFA_CACHEINFO]) {
4513 struct ifa_cacheinfo *ci;
4514
4515 ci = nla_data(tb[IFA_CACHEINFO]);
4516 valid_lft = ci->ifa_valid;
4517 preferred_lft = ci->ifa_prefered;
4518 } else {
4519 preferred_lft = INFINITY_LIFE_TIME;
4520 valid_lft = INFINITY_LIFE_TIME;
4521 }
4522
4523 dev = __dev_get_by_index(net, ifm->ifa_index);
4524 if (!dev)
4525 return -ENODEV;
4526
4527 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4528
4529 /* We ignore other flags so far. */
4530 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4531 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4532
4533 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4534 if (!ifa) {
4535 /*
4536 * It would be best to check for !NLM_F_CREATE here but
4537 * userspace already relies on not having to provide this.
4538 */
4539 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4540 ifm->ifa_prefixlen, ifa_flags,
4541 preferred_lft, valid_lft);
4542 }
4543
4544 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4545 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4546 err = -EEXIST;
4547 else
4548 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4549
4550 in6_ifa_put(ifa);
4551
4552 return err;
4553 }
4554
4555 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4556 u8 scope, int ifindex)
4557 {
4558 struct ifaddrmsg *ifm;
4559
4560 ifm = nlmsg_data(nlh);
4561 ifm->ifa_family = AF_INET6;
4562 ifm->ifa_prefixlen = prefixlen;
4563 ifm->ifa_flags = flags;
4564 ifm->ifa_scope = scope;
4565 ifm->ifa_index = ifindex;
4566 }
4567
4568 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4569 unsigned long tstamp, u32 preferred, u32 valid)
4570 {
4571 struct ifa_cacheinfo ci;
4572
4573 ci.cstamp = cstamp_delta(cstamp);
4574 ci.tstamp = cstamp_delta(tstamp);
4575 ci.ifa_prefered = preferred;
4576 ci.ifa_valid = valid;
4577
4578 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4579 }
4580
4581 static inline int rt_scope(int ifa_scope)
4582 {
4583 if (ifa_scope & IFA_HOST)
4584 return RT_SCOPE_HOST;
4585 else if (ifa_scope & IFA_LINK)
4586 return RT_SCOPE_LINK;
4587 else if (ifa_scope & IFA_SITE)
4588 return RT_SCOPE_SITE;
4589 else
4590 return RT_SCOPE_UNIVERSE;
4591 }
4592
4593 static inline int inet6_ifaddr_msgsize(void)
4594 {
4595 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4596 + nla_total_size(16) /* IFA_LOCAL */
4597 + nla_total_size(16) /* IFA_ADDRESS */
4598 + nla_total_size(sizeof(struct ifa_cacheinfo))
4599 + nla_total_size(4) /* IFA_FLAGS */;
4600 }
4601
4602 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4603 u32 portid, u32 seq, int event, unsigned int flags)
4604 {
4605 struct nlmsghdr *nlh;
4606 u32 preferred, valid;
4607
4608 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4609 if (!nlh)
4610 return -EMSGSIZE;
4611
4612 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4613 ifa->idev->dev->ifindex);
4614
4615 if (!((ifa->flags&IFA_F_PERMANENT) &&
4616 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4617 preferred = ifa->prefered_lft;
4618 valid = ifa->valid_lft;
4619 if (preferred != INFINITY_LIFE_TIME) {
4620 long tval = (jiffies - ifa->tstamp)/HZ;
4621 if (preferred > tval)
4622 preferred -= tval;
4623 else
4624 preferred = 0;
4625 if (valid != INFINITY_LIFE_TIME) {
4626 if (valid > tval)
4627 valid -= tval;
4628 else
4629 valid = 0;
4630 }
4631 }
4632 } else {
4633 preferred = INFINITY_LIFE_TIME;
4634 valid = INFINITY_LIFE_TIME;
4635 }
4636
4637 if (!ipv6_addr_any(&ifa->peer_addr)) {
4638 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4639 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4640 goto error;
4641 } else
4642 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4643 goto error;
4644
4645 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4646 goto error;
4647
4648 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4649 goto error;
4650
4651 nlmsg_end(skb, nlh);
4652 return 0;
4653
4654 error:
4655 nlmsg_cancel(skb, nlh);
4656 return -EMSGSIZE;
4657 }
4658
4659 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4660 u32 portid, u32 seq, int event, u16 flags)
4661 {
4662 struct nlmsghdr *nlh;
4663 u8 scope = RT_SCOPE_UNIVERSE;
4664 int ifindex = ifmca->idev->dev->ifindex;
4665
4666 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4667 scope = RT_SCOPE_SITE;
4668
4669 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4670 if (!nlh)
4671 return -EMSGSIZE;
4672
4673 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4674 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4675 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4676 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4677 nlmsg_cancel(skb, nlh);
4678 return -EMSGSIZE;
4679 }
4680
4681 nlmsg_end(skb, nlh);
4682 return 0;
4683 }
4684
4685 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4686 u32 portid, u32 seq, int event, unsigned int flags)
4687 {
4688 struct nlmsghdr *nlh;
4689 u8 scope = RT_SCOPE_UNIVERSE;
4690 int ifindex = ifaca->aca_idev->dev->ifindex;
4691
4692 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4693 scope = RT_SCOPE_SITE;
4694
4695 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4696 if (!nlh)
4697 return -EMSGSIZE;
4698
4699 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4700 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4701 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4702 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4703 nlmsg_cancel(skb, nlh);
4704 return -EMSGSIZE;
4705 }
4706
4707 nlmsg_end(skb, nlh);
4708 return 0;
4709 }
4710
4711 enum addr_type_t {
4712 UNICAST_ADDR,
4713 MULTICAST_ADDR,
4714 ANYCAST_ADDR,
4715 };
4716
4717 /* called with rcu_read_lock() */
4718 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4719 struct netlink_callback *cb, enum addr_type_t type,
4720 int s_ip_idx, int *p_ip_idx)
4721 {
4722 struct ifmcaddr6 *ifmca;
4723 struct ifacaddr6 *ifaca;
4724 int err = 1;
4725 int ip_idx = *p_ip_idx;
4726
4727 read_lock_bh(&idev->lock);
4728 switch (type) {
4729 case UNICAST_ADDR: {
4730 struct inet6_ifaddr *ifa;
4731
4732 /* unicast address incl. temp addr */
4733 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4734 if (++ip_idx < s_ip_idx)
4735 continue;
4736 err = inet6_fill_ifaddr(skb, ifa,
4737 NETLINK_CB(cb->skb).portid,
4738 cb->nlh->nlmsg_seq,
4739 RTM_NEWADDR,
4740 NLM_F_MULTI);
4741 if (err < 0)
4742 break;
4743 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4744 }
4745 break;
4746 }
4747 case MULTICAST_ADDR:
4748 /* multicast address */
4749 for (ifmca = idev->mc_list; ifmca;
4750 ifmca = ifmca->next, ip_idx++) {
4751 if (ip_idx < s_ip_idx)
4752 continue;
4753 err = inet6_fill_ifmcaddr(skb, ifmca,
4754 NETLINK_CB(cb->skb).portid,
4755 cb->nlh->nlmsg_seq,
4756 RTM_GETMULTICAST,
4757 NLM_F_MULTI);
4758 if (err < 0)
4759 break;
4760 }
4761 break;
4762 case ANYCAST_ADDR:
4763 /* anycast address */
4764 for (ifaca = idev->ac_list; ifaca;
4765 ifaca = ifaca->aca_next, ip_idx++) {
4766 if (ip_idx < s_ip_idx)
4767 continue;
4768 err = inet6_fill_ifacaddr(skb, ifaca,
4769 NETLINK_CB(cb->skb).portid,
4770 cb->nlh->nlmsg_seq,
4771 RTM_GETANYCAST,
4772 NLM_F_MULTI);
4773 if (err < 0)
4774 break;
4775 }
4776 break;
4777 default:
4778 break;
4779 }
4780 read_unlock_bh(&idev->lock);
4781 *p_ip_idx = ip_idx;
4782 return err;
4783 }
4784
4785 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4786 enum addr_type_t type)
4787 {
4788 struct net *net = sock_net(skb->sk);
4789 int h, s_h;
4790 int idx, ip_idx;
4791 int s_idx, s_ip_idx;
4792 struct net_device *dev;
4793 struct inet6_dev *idev;
4794 struct hlist_head *head;
4795
4796 s_h = cb->args[0];
4797 s_idx = idx = cb->args[1];
4798 s_ip_idx = ip_idx = cb->args[2];
4799
4800 rcu_read_lock();
4801 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4802 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4803 idx = 0;
4804 head = &net->dev_index_head[h];
4805 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4806 if (idx < s_idx)
4807 goto cont;
4808 if (h > s_h || idx > s_idx)
4809 s_ip_idx = 0;
4810 ip_idx = 0;
4811 idev = __in6_dev_get(dev);
4812 if (!idev)
4813 goto cont;
4814
4815 if (in6_dump_addrs(idev, skb, cb, type,
4816 s_ip_idx, &ip_idx) < 0)
4817 goto done;
4818 cont:
4819 idx++;
4820 }
4821 }
4822 done:
4823 rcu_read_unlock();
4824 cb->args[0] = h;
4825 cb->args[1] = idx;
4826 cb->args[2] = ip_idx;
4827
4828 return skb->len;
4829 }
4830
4831 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4832 {
4833 enum addr_type_t type = UNICAST_ADDR;
4834
4835 return inet6_dump_addr(skb, cb, type);
4836 }
4837
4838 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4839 {
4840 enum addr_type_t type = MULTICAST_ADDR;
4841
4842 return inet6_dump_addr(skb, cb, type);
4843 }
4844
4845
4846 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4847 {
4848 enum addr_type_t type = ANYCAST_ADDR;
4849
4850 return inet6_dump_addr(skb, cb, type);
4851 }
4852
4853 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4854 {
4855 struct net *net = sock_net(in_skb->sk);
4856 struct ifaddrmsg *ifm;
4857 struct nlattr *tb[IFA_MAX+1];
4858 struct in6_addr *addr = NULL, *peer;
4859 struct net_device *dev = NULL;
4860 struct inet6_ifaddr *ifa;
4861 struct sk_buff *skb;
4862 int err;
4863
4864 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4865 if (err < 0)
4866 goto errout;
4867
4868 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4869 if (!addr) {
4870 err = -EINVAL;
4871 goto errout;
4872 }
4873
4874 ifm = nlmsg_data(nlh);
4875 if (ifm->ifa_index)
4876 dev = __dev_get_by_index(net, ifm->ifa_index);
4877
4878 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4879 if (!ifa) {
4880 err = -EADDRNOTAVAIL;
4881 goto errout;
4882 }
4883
4884 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4885 if (!skb) {
4886 err = -ENOBUFS;
4887 goto errout_ifa;
4888 }
4889
4890 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4891 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4892 if (err < 0) {
4893 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4894 WARN_ON(err == -EMSGSIZE);
4895 kfree_skb(skb);
4896 goto errout_ifa;
4897 }
4898 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4899 errout_ifa:
4900 in6_ifa_put(ifa);
4901 errout:
4902 return err;
4903 }
4904
4905 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4906 {
4907 struct sk_buff *skb;
4908 struct net *net = dev_net(ifa->idev->dev);
4909 int err = -ENOBUFS;
4910
4911 /* Don't send DELADDR notification for TENTATIVE address,
4912 * since NEWADDR notification is sent only after removing
4913 * TENTATIVE flag.
4914 */
4915 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4916 return;
4917
4918 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4919 if (!skb)
4920 goto errout;
4921
4922 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4923 if (err < 0) {
4924 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4925 WARN_ON(err == -EMSGSIZE);
4926 kfree_skb(skb);
4927 goto errout;
4928 }
4929 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4930 return;
4931 errout:
4932 if (err < 0)
4933 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4934 }
4935
4936 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4937 __s32 *array, int bytes)
4938 {
4939 BUG_ON(bytes < (DEVCONF_MAX * 4));
4940
4941 memset(array, 0, bytes);
4942 array[DEVCONF_FORWARDING] = cnf->forwarding;
4943 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4944 array[DEVCONF_MTU6] = cnf->mtu6;
4945 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4946 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4947 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4948 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4949 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4950 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4951 jiffies_to_msecs(cnf->rtr_solicit_interval);
4952 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4953 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
4954 array[DEVCONF_RTR_SOLICIT_DELAY] =
4955 jiffies_to_msecs(cnf->rtr_solicit_delay);
4956 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4957 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4958 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4959 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4960 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4961 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4962 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4963 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4964 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4965 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4966 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4967 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4968 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4969 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4970 #ifdef CONFIG_IPV6_ROUTER_PREF
4971 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4972 array[DEVCONF_RTR_PROBE_INTERVAL] =
4973 jiffies_to_msecs(cnf->rtr_probe_interval);
4974 #ifdef CONFIG_IPV6_ROUTE_INFO
4975 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4976 #endif
4977 #endif
4978 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4979 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4980 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4981 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4982 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4983 #endif
4984 #ifdef CONFIG_IPV6_MROUTE
4985 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4986 #endif
4987 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4988 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4989 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4990 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4991 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4992 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4993 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4994 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4995 /* we omit DEVCONF_STABLE_SECRET for now */
4996 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4997 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4998 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4999 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5000 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5001 #ifdef CONFIG_IPV6_SEG6_HMAC
5002 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5003 #endif
5004 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5005 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5006 }
5007
5008 static inline size_t inet6_ifla6_size(void)
5009 {
5010 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5011 + nla_total_size(sizeof(struct ifla_cacheinfo))
5012 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5013 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5014 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5015 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5016 }
5017
5018 static inline size_t inet6_if_nlmsg_size(void)
5019 {
5020 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5021 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5022 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5023 + nla_total_size(4) /* IFLA_MTU */
5024 + nla_total_size(4) /* IFLA_LINK */
5025 + nla_total_size(1) /* IFLA_OPERSTATE */
5026 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5027 }
5028
5029 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5030 int bytes)
5031 {
5032 int i;
5033 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5034 BUG_ON(pad < 0);
5035
5036 /* Use put_unaligned() because stats may not be aligned for u64. */
5037 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5038 for (i = 1; i < ICMP6_MIB_MAX; i++)
5039 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5040
5041 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5042 }
5043
5044 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5045 int bytes, size_t syncpoff)
5046 {
5047 int i, c;
5048 u64 buff[IPSTATS_MIB_MAX];
5049 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5050
5051 BUG_ON(pad < 0);
5052
5053 memset(buff, 0, sizeof(buff));
5054 buff[0] = IPSTATS_MIB_MAX;
5055
5056 for_each_possible_cpu(c) {
5057 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5058 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5059 }
5060
5061 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5062 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5063 }
5064
5065 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5066 int bytes)
5067 {
5068 switch (attrtype) {
5069 case IFLA_INET6_STATS:
5070 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5071 offsetof(struct ipstats_mib, syncp));
5072 break;
5073 case IFLA_INET6_ICMP6STATS:
5074 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5075 break;
5076 }
5077 }
5078
5079 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5080 u32 ext_filter_mask)
5081 {
5082 struct nlattr *nla;
5083 struct ifla_cacheinfo ci;
5084
5085 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5086 goto nla_put_failure;
5087 ci.max_reasm_len = IPV6_MAXPLEN;
5088 ci.tstamp = cstamp_delta(idev->tstamp);
5089 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5090 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5091 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5092 goto nla_put_failure;
5093 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5094 if (!nla)
5095 goto nla_put_failure;
5096 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5097
5098 /* XXX - MC not implemented */
5099
5100 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5101 return 0;
5102
5103 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5104 if (!nla)
5105 goto nla_put_failure;
5106 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5107
5108 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5109 if (!nla)
5110 goto nla_put_failure;
5111 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5112
5113 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5114 if (!nla)
5115 goto nla_put_failure;
5116
5117 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5118 goto nla_put_failure;
5119
5120 read_lock_bh(&idev->lock);
5121 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5122 read_unlock_bh(&idev->lock);
5123
5124 return 0;
5125
5126 nla_put_failure:
5127 return -EMSGSIZE;
5128 }
5129
5130 static size_t inet6_get_link_af_size(const struct net_device *dev,
5131 u32 ext_filter_mask)
5132 {
5133 if (!__in6_dev_get(dev))
5134 return 0;
5135
5136 return inet6_ifla6_size();
5137 }
5138
5139 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5140 u32 ext_filter_mask)
5141 {
5142 struct inet6_dev *idev = __in6_dev_get(dev);
5143
5144 if (!idev)
5145 return -ENODATA;
5146
5147 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5148 return -EMSGSIZE;
5149
5150 return 0;
5151 }
5152
5153 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5154 {
5155 struct inet6_ifaddr *ifp;
5156 struct net_device *dev = idev->dev;
5157 bool clear_token, update_rs = false;
5158 struct in6_addr ll_addr;
5159
5160 ASSERT_RTNL();
5161
5162 if (!token)
5163 return -EINVAL;
5164 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5165 return -EINVAL;
5166 if (!ipv6_accept_ra(idev))
5167 return -EINVAL;
5168 if (idev->cnf.rtr_solicits == 0)
5169 return -EINVAL;
5170
5171 write_lock_bh(&idev->lock);
5172
5173 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5174 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5175
5176 write_unlock_bh(&idev->lock);
5177
5178 clear_token = ipv6_addr_any(token);
5179 if (clear_token)
5180 goto update_lft;
5181
5182 if (!idev->dead && (idev->if_flags & IF_READY) &&
5183 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5184 IFA_F_OPTIMISTIC)) {
5185 /* If we're not ready, then normal ifup will take care
5186 * of this. Otherwise, we need to request our rs here.
5187 */
5188 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5189 update_rs = true;
5190 }
5191
5192 update_lft:
5193 write_lock_bh(&idev->lock);
5194
5195 if (update_rs) {
5196 idev->if_flags |= IF_RS_SENT;
5197 idev->rs_interval = rfc3315_s14_backoff_init(
5198 idev->cnf.rtr_solicit_interval);
5199 idev->rs_probes = 1;
5200 addrconf_mod_rs_timer(idev, idev->rs_interval);
5201 }
5202
5203 /* Well, that's kinda nasty ... */
5204 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5205 spin_lock(&ifp->lock);
5206 if (ifp->tokenized) {
5207 ifp->valid_lft = 0;
5208 ifp->prefered_lft = 0;
5209 }
5210 spin_unlock(&ifp->lock);
5211 }
5212
5213 write_unlock_bh(&idev->lock);
5214 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5215 addrconf_verify_rtnl();
5216 return 0;
5217 }
5218
5219 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5220 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5221 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5222 };
5223
5224 static int inet6_validate_link_af(const struct net_device *dev,
5225 const struct nlattr *nla)
5226 {
5227 struct nlattr *tb[IFLA_INET6_MAX + 1];
5228
5229 if (dev && !__in6_dev_get(dev))
5230 return -EAFNOSUPPORT;
5231
5232 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5233 }
5234
5235 static int check_addr_gen_mode(int mode)
5236 {
5237 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5238 mode != IN6_ADDR_GEN_MODE_NONE &&
5239 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5240 mode != IN6_ADDR_GEN_MODE_RANDOM)
5241 return -EINVAL;
5242 return 1;
5243 }
5244
5245 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5246 int mode)
5247 {
5248 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5249 !idev->cnf.stable_secret.initialized &&
5250 !net->ipv6.devconf_dflt->stable_secret.initialized)
5251 return -EINVAL;
5252 return 1;
5253 }
5254
5255 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5256 {
5257 int err = -EINVAL;
5258 struct inet6_dev *idev = __in6_dev_get(dev);
5259 struct nlattr *tb[IFLA_INET6_MAX + 1];
5260
5261 if (!idev)
5262 return -EAFNOSUPPORT;
5263
5264 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5265 BUG();
5266
5267 if (tb[IFLA_INET6_TOKEN]) {
5268 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5269 if (err)
5270 return err;
5271 }
5272
5273 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5274 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5275
5276 if (check_addr_gen_mode(mode) < 0 ||
5277 check_stable_privacy(idev, dev_net(dev), mode) < 0)
5278 return -EINVAL;
5279
5280 idev->cnf.addr_gen_mode = mode;
5281 err = 0;
5282 }
5283
5284 return err;
5285 }
5286
5287 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5288 u32 portid, u32 seq, int event, unsigned int flags)
5289 {
5290 struct net_device *dev = idev->dev;
5291 struct ifinfomsg *hdr;
5292 struct nlmsghdr *nlh;
5293 void *protoinfo;
5294
5295 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5296 if (!nlh)
5297 return -EMSGSIZE;
5298
5299 hdr = nlmsg_data(nlh);
5300 hdr->ifi_family = AF_INET6;
5301 hdr->__ifi_pad = 0;
5302 hdr->ifi_type = dev->type;
5303 hdr->ifi_index = dev->ifindex;
5304 hdr->ifi_flags = dev_get_flags(dev);
5305 hdr->ifi_change = 0;
5306
5307 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5308 (dev->addr_len &&
5309 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5310 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5311 (dev->ifindex != dev_get_iflink(dev) &&
5312 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5313 nla_put_u8(skb, IFLA_OPERSTATE,
5314 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5315 goto nla_put_failure;
5316 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5317 if (!protoinfo)
5318 goto nla_put_failure;
5319
5320 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5321 goto nla_put_failure;
5322
5323 nla_nest_end(skb, protoinfo);
5324 nlmsg_end(skb, nlh);
5325 return 0;
5326
5327 nla_put_failure:
5328 nlmsg_cancel(skb, nlh);
5329 return -EMSGSIZE;
5330 }
5331
5332 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5333 {
5334 struct net *net = sock_net(skb->sk);
5335 int h, s_h;
5336 int idx = 0, s_idx;
5337 struct net_device *dev;
5338 struct inet6_dev *idev;
5339 struct hlist_head *head;
5340
5341 s_h = cb->args[0];
5342 s_idx = cb->args[1];
5343
5344 rcu_read_lock();
5345 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5346 idx = 0;
5347 head = &net->dev_index_head[h];
5348 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5349 if (idx < s_idx)
5350 goto cont;
5351 idev = __in6_dev_get(dev);
5352 if (!idev)
5353 goto cont;
5354 if (inet6_fill_ifinfo(skb, idev,
5355 NETLINK_CB(cb->skb).portid,
5356 cb->nlh->nlmsg_seq,
5357 RTM_NEWLINK, NLM_F_MULTI) < 0)
5358 goto out;
5359 cont:
5360 idx++;
5361 }
5362 }
5363 out:
5364 rcu_read_unlock();
5365 cb->args[1] = idx;
5366 cb->args[0] = h;
5367
5368 return skb->len;
5369 }
5370
5371 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5372 {
5373 struct sk_buff *skb;
5374 struct net *net = dev_net(idev->dev);
5375 int err = -ENOBUFS;
5376
5377 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5378 if (!skb)
5379 goto errout;
5380
5381 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5382 if (err < 0) {
5383 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5384 WARN_ON(err == -EMSGSIZE);
5385 kfree_skb(skb);
5386 goto errout;
5387 }
5388 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5389 return;
5390 errout:
5391 if (err < 0)
5392 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5393 }
5394
5395 static inline size_t inet6_prefix_nlmsg_size(void)
5396 {
5397 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5398 + nla_total_size(sizeof(struct in6_addr))
5399 + nla_total_size(sizeof(struct prefix_cacheinfo));
5400 }
5401
5402 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5403 struct prefix_info *pinfo, u32 portid, u32 seq,
5404 int event, unsigned int flags)
5405 {
5406 struct prefixmsg *pmsg;
5407 struct nlmsghdr *nlh;
5408 struct prefix_cacheinfo ci;
5409
5410 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5411 if (!nlh)
5412 return -EMSGSIZE;
5413
5414 pmsg = nlmsg_data(nlh);
5415 pmsg->prefix_family = AF_INET6;
5416 pmsg->prefix_pad1 = 0;
5417 pmsg->prefix_pad2 = 0;
5418 pmsg->prefix_ifindex = idev->dev->ifindex;
5419 pmsg->prefix_len = pinfo->prefix_len;
5420 pmsg->prefix_type = pinfo->type;
5421 pmsg->prefix_pad3 = 0;
5422 pmsg->prefix_flags = 0;
5423 if (pinfo->onlink)
5424 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5425 if (pinfo->autoconf)
5426 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5427
5428 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5429 goto nla_put_failure;
5430 ci.preferred_time = ntohl(pinfo->prefered);
5431 ci.valid_time = ntohl(pinfo->valid);
5432 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5433 goto nla_put_failure;
5434 nlmsg_end(skb, nlh);
5435 return 0;
5436
5437 nla_put_failure:
5438 nlmsg_cancel(skb, nlh);
5439 return -EMSGSIZE;
5440 }
5441
5442 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5443 struct prefix_info *pinfo)
5444 {
5445 struct sk_buff *skb;
5446 struct net *net = dev_net(idev->dev);
5447 int err = -ENOBUFS;
5448
5449 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5450 if (!skb)
5451 goto errout;
5452
5453 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5454 if (err < 0) {
5455 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5456 WARN_ON(err == -EMSGSIZE);
5457 kfree_skb(skb);
5458 goto errout;
5459 }
5460 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5461 return;
5462 errout:
5463 if (err < 0)
5464 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5465 }
5466
5467 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5468 {
5469 struct net *net = dev_net(ifp->idev->dev);
5470
5471 if (event)
5472 ASSERT_RTNL();
5473
5474 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5475
5476 switch (event) {
5477 case RTM_NEWADDR:
5478 /*
5479 * If the address was optimistic
5480 * we inserted the route at the start of
5481 * our DAD process, so we don't need
5482 * to do it again
5483 */
5484 if (!(ifp->rt->rt6i_node))
5485 ip6_ins_rt(ifp->rt);
5486 if (ifp->idev->cnf.forwarding)
5487 addrconf_join_anycast(ifp);
5488 if (!ipv6_addr_any(&ifp->peer_addr))
5489 addrconf_prefix_route(&ifp->peer_addr, 128,
5490 ifp->idev->dev, 0, 0);
5491 break;
5492 case RTM_DELADDR:
5493 if (ifp->idev->cnf.forwarding)
5494 addrconf_leave_anycast(ifp);
5495 addrconf_leave_solict(ifp->idev, &ifp->addr);
5496 if (!ipv6_addr_any(&ifp->peer_addr)) {
5497 struct rt6_info *rt;
5498
5499 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5500 ifp->idev->dev, 0, 0);
5501 if (rt)
5502 ip6_del_rt(rt);
5503 }
5504 if (ifp->rt) {
5505 dst_hold(&ifp->rt->dst);
5506 ip6_del_rt(ifp->rt);
5507 }
5508 rt_genid_bump_ipv6(net);
5509 break;
5510 }
5511 atomic_inc(&net->ipv6.dev_addr_genid);
5512 }
5513
5514 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5515 {
5516 rcu_read_lock_bh();
5517 if (likely(ifp->idev->dead == 0))
5518 __ipv6_ifa_notify(event, ifp);
5519 rcu_read_unlock_bh();
5520 }
5521
5522 #ifdef CONFIG_SYSCTL
5523
5524 static
5525 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5526 void __user *buffer, size_t *lenp, loff_t *ppos)
5527 {
5528 int *valp = ctl->data;
5529 int val = *valp;
5530 loff_t pos = *ppos;
5531 struct ctl_table lctl;
5532 int ret;
5533
5534 /*
5535 * ctl->data points to idev->cnf.forwarding, we should
5536 * not modify it until we get the rtnl lock.
5537 */
5538 lctl = *ctl;
5539 lctl.data = &val;
5540
5541 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5542
5543 if (write)
5544 ret = addrconf_fixup_forwarding(ctl, valp, val);
5545 if (ret)
5546 *ppos = pos;
5547 return ret;
5548 }
5549
5550 static
5551 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5552 void __user *buffer, size_t *lenp, loff_t *ppos)
5553 {
5554 struct inet6_dev *idev = ctl->extra1;
5555 int min_mtu = IPV6_MIN_MTU;
5556 struct ctl_table lctl;
5557
5558 lctl = *ctl;
5559 lctl.extra1 = &min_mtu;
5560 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5561
5562 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5563 }
5564
5565 static void dev_disable_change(struct inet6_dev *idev)
5566 {
5567 struct netdev_notifier_info info;
5568
5569 if (!idev || !idev->dev)
5570 return;
5571
5572 netdev_notifier_info_init(&info, idev->dev);
5573 if (idev->cnf.disable_ipv6)
5574 addrconf_notify(NULL, NETDEV_DOWN, &info);
5575 else
5576 addrconf_notify(NULL, NETDEV_UP, &info);
5577 }
5578
5579 static void addrconf_disable_change(struct net *net, __s32 newf)
5580 {
5581 struct net_device *dev;
5582 struct inet6_dev *idev;
5583
5584 for_each_netdev(net, dev) {
5585 idev = __in6_dev_get(dev);
5586 if (idev) {
5587 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5588 idev->cnf.disable_ipv6 = newf;
5589 if (changed)
5590 dev_disable_change(idev);
5591 }
5592 }
5593 }
5594
5595 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5596 {
5597 struct net *net;
5598 int old;
5599
5600 if (!rtnl_trylock())
5601 return restart_syscall();
5602
5603 net = (struct net *)table->extra2;
5604 old = *p;
5605 *p = newf;
5606
5607 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5608 rtnl_unlock();
5609 return 0;
5610 }
5611
5612 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5613 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5614 addrconf_disable_change(net, newf);
5615 } else if ((!newf) ^ (!old))
5616 dev_disable_change((struct inet6_dev *)table->extra1);
5617
5618 rtnl_unlock();
5619 return 0;
5620 }
5621
5622 static
5623 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5624 void __user *buffer, size_t *lenp, loff_t *ppos)
5625 {
5626 int *valp = ctl->data;
5627 int val = *valp;
5628 loff_t pos = *ppos;
5629 struct ctl_table lctl;
5630 int ret;
5631
5632 /*
5633 * ctl->data points to idev->cnf.disable_ipv6, we should
5634 * not modify it until we get the rtnl lock.
5635 */
5636 lctl = *ctl;
5637 lctl.data = &val;
5638
5639 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5640
5641 if (write)
5642 ret = addrconf_disable_ipv6(ctl, valp, val);
5643 if (ret)
5644 *ppos = pos;
5645 return ret;
5646 }
5647
5648 static
5649 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5650 void __user *buffer, size_t *lenp, loff_t *ppos)
5651 {
5652 int *valp = ctl->data;
5653 int ret;
5654 int old, new;
5655
5656 old = *valp;
5657 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5658 new = *valp;
5659
5660 if (write && old != new) {
5661 struct net *net = ctl->extra2;
5662
5663 if (!rtnl_trylock())
5664 return restart_syscall();
5665
5666 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5667 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5668 NETCONFA_IFINDEX_DEFAULT,
5669 net->ipv6.devconf_dflt);
5670 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5671 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5672 NETCONFA_IFINDEX_ALL,
5673 net->ipv6.devconf_all);
5674 else {
5675 struct inet6_dev *idev = ctl->extra1;
5676
5677 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5678 idev->dev->ifindex,
5679 &idev->cnf);
5680 }
5681 rtnl_unlock();
5682 }
5683
5684 return ret;
5685 }
5686
5687 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5688 void __user *buffer, size_t *lenp,
5689 loff_t *ppos)
5690 {
5691 int ret = 0;
5692 int new_val;
5693 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5694 struct net *net = (struct net *)ctl->extra2;
5695
5696 if (!rtnl_trylock())
5697 return restart_syscall();
5698
5699 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5700
5701 if (write) {
5702 new_val = *((int *)ctl->data);
5703
5704 if (check_addr_gen_mode(new_val) < 0) {
5705 ret = -EINVAL;
5706 goto out;
5707 }
5708
5709 /* request for default */
5710 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5711 ipv6_devconf_dflt.addr_gen_mode = new_val;
5712
5713 /* request for individual net device */
5714 } else {
5715 if (!idev)
5716 goto out;
5717
5718 if (check_stable_privacy(idev, net, new_val) < 0) {
5719 ret = -EINVAL;
5720 goto out;
5721 }
5722
5723 if (idev->cnf.addr_gen_mode != new_val) {
5724 idev->cnf.addr_gen_mode = new_val;
5725 addrconf_dev_config(idev->dev);
5726 }
5727 }
5728 }
5729
5730 out:
5731 rtnl_unlock();
5732
5733 return ret;
5734 }
5735
5736 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5737 void __user *buffer, size_t *lenp,
5738 loff_t *ppos)
5739 {
5740 int err;
5741 struct in6_addr addr;
5742 char str[IPV6_MAX_STRLEN];
5743 struct ctl_table lctl = *ctl;
5744 struct net *net = ctl->extra2;
5745 struct ipv6_stable_secret *secret = ctl->data;
5746
5747 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5748 return -EIO;
5749
5750 lctl.maxlen = IPV6_MAX_STRLEN;
5751 lctl.data = str;
5752
5753 if (!rtnl_trylock())
5754 return restart_syscall();
5755
5756 if (!write && !secret->initialized) {
5757 err = -EIO;
5758 goto out;
5759 }
5760
5761 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5762 if (err >= sizeof(str)) {
5763 err = -EIO;
5764 goto out;
5765 }
5766
5767 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5768 if (err || !write)
5769 goto out;
5770
5771 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5772 err = -EIO;
5773 goto out;
5774 }
5775
5776 secret->initialized = true;
5777 secret->secret = addr;
5778
5779 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5780 struct net_device *dev;
5781
5782 for_each_netdev(net, dev) {
5783 struct inet6_dev *idev = __in6_dev_get(dev);
5784
5785 if (idev) {
5786 idev->cnf.addr_gen_mode =
5787 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5788 }
5789 }
5790 } else {
5791 struct inet6_dev *idev = ctl->extra1;
5792
5793 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5794 }
5795
5796 out:
5797 rtnl_unlock();
5798
5799 return err;
5800 }
5801
5802 static
5803 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5804 int write,
5805 void __user *buffer,
5806 size_t *lenp,
5807 loff_t *ppos)
5808 {
5809 int *valp = ctl->data;
5810 int val = *valp;
5811 loff_t pos = *ppos;
5812 struct ctl_table lctl;
5813 int ret;
5814
5815 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5816 * we should not modify it until we get the rtnl lock.
5817 */
5818 lctl = *ctl;
5819 lctl.data = &val;
5820
5821 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5822
5823 if (write)
5824 ret = addrconf_fixup_linkdown(ctl, valp, val);
5825 if (ret)
5826 *ppos = pos;
5827 return ret;
5828 }
5829
5830 static int minus_one = -1;
5831 static const int one = 1;
5832 static const int two_five_five = 255;
5833
5834 static const struct ctl_table addrconf_sysctl[] = {
5835 {
5836 .procname = "forwarding",
5837 .data = &ipv6_devconf.forwarding,
5838 .maxlen = sizeof(int),
5839 .mode = 0644,
5840 .proc_handler = addrconf_sysctl_forward,
5841 },
5842 {
5843 .procname = "hop_limit",
5844 .data = &ipv6_devconf.hop_limit,
5845 .maxlen = sizeof(int),
5846 .mode = 0644,
5847 .proc_handler = proc_dointvec_minmax,
5848 .extra1 = (void *)&one,
5849 .extra2 = (void *)&two_five_five,
5850 },
5851 {
5852 .procname = "mtu",
5853 .data = &ipv6_devconf.mtu6,
5854 .maxlen = sizeof(int),
5855 .mode = 0644,
5856 .proc_handler = addrconf_sysctl_mtu,
5857 },
5858 {
5859 .procname = "accept_ra",
5860 .data = &ipv6_devconf.accept_ra,
5861 .maxlen = sizeof(int),
5862 .mode = 0644,
5863 .proc_handler = proc_dointvec,
5864 },
5865 {
5866 .procname = "accept_redirects",
5867 .data = &ipv6_devconf.accept_redirects,
5868 .maxlen = sizeof(int),
5869 .mode = 0644,
5870 .proc_handler = proc_dointvec,
5871 },
5872 {
5873 .procname = "autoconf",
5874 .data = &ipv6_devconf.autoconf,
5875 .maxlen = sizeof(int),
5876 .mode = 0644,
5877 .proc_handler = proc_dointvec,
5878 },
5879 {
5880 .procname = "dad_transmits",
5881 .data = &ipv6_devconf.dad_transmits,
5882 .maxlen = sizeof(int),
5883 .mode = 0644,
5884 .proc_handler = proc_dointvec,
5885 },
5886 {
5887 .procname = "router_solicitations",
5888 .data = &ipv6_devconf.rtr_solicits,
5889 .maxlen = sizeof(int),
5890 .mode = 0644,
5891 .proc_handler = proc_dointvec_minmax,
5892 .extra1 = &minus_one,
5893 },
5894 {
5895 .procname = "router_solicitation_interval",
5896 .data = &ipv6_devconf.rtr_solicit_interval,
5897 .maxlen = sizeof(int),
5898 .mode = 0644,
5899 .proc_handler = proc_dointvec_jiffies,
5900 },
5901 {
5902 .procname = "router_solicitation_max_interval",
5903 .data = &ipv6_devconf.rtr_solicit_max_interval,
5904 .maxlen = sizeof(int),
5905 .mode = 0644,
5906 .proc_handler = proc_dointvec_jiffies,
5907 },
5908 {
5909 .procname = "router_solicitation_delay",
5910 .data = &ipv6_devconf.rtr_solicit_delay,
5911 .maxlen = sizeof(int),
5912 .mode = 0644,
5913 .proc_handler = proc_dointvec_jiffies,
5914 },
5915 {
5916 .procname = "force_mld_version",
5917 .data = &ipv6_devconf.force_mld_version,
5918 .maxlen = sizeof(int),
5919 .mode = 0644,
5920 .proc_handler = proc_dointvec,
5921 },
5922 {
5923 .procname = "mldv1_unsolicited_report_interval",
5924 .data =
5925 &ipv6_devconf.mldv1_unsolicited_report_interval,
5926 .maxlen = sizeof(int),
5927 .mode = 0644,
5928 .proc_handler = proc_dointvec_ms_jiffies,
5929 },
5930 {
5931 .procname = "mldv2_unsolicited_report_interval",
5932 .data =
5933 &ipv6_devconf.mldv2_unsolicited_report_interval,
5934 .maxlen = sizeof(int),
5935 .mode = 0644,
5936 .proc_handler = proc_dointvec_ms_jiffies,
5937 },
5938 {
5939 .procname = "use_tempaddr",
5940 .data = &ipv6_devconf.use_tempaddr,
5941 .maxlen = sizeof(int),
5942 .mode = 0644,
5943 .proc_handler = proc_dointvec,
5944 },
5945 {
5946 .procname = "temp_valid_lft",
5947 .data = &ipv6_devconf.temp_valid_lft,
5948 .maxlen = sizeof(int),
5949 .mode = 0644,
5950 .proc_handler = proc_dointvec,
5951 },
5952 {
5953 .procname = "temp_prefered_lft",
5954 .data = &ipv6_devconf.temp_prefered_lft,
5955 .maxlen = sizeof(int),
5956 .mode = 0644,
5957 .proc_handler = proc_dointvec,
5958 },
5959 {
5960 .procname = "regen_max_retry",
5961 .data = &ipv6_devconf.regen_max_retry,
5962 .maxlen = sizeof(int),
5963 .mode = 0644,
5964 .proc_handler = proc_dointvec,
5965 },
5966 {
5967 .procname = "max_desync_factor",
5968 .data = &ipv6_devconf.max_desync_factor,
5969 .maxlen = sizeof(int),
5970 .mode = 0644,
5971 .proc_handler = proc_dointvec,
5972 },
5973 {
5974 .procname = "max_addresses",
5975 .data = &ipv6_devconf.max_addresses,
5976 .maxlen = sizeof(int),
5977 .mode = 0644,
5978 .proc_handler = proc_dointvec,
5979 },
5980 {
5981 .procname = "accept_ra_defrtr",
5982 .data = &ipv6_devconf.accept_ra_defrtr,
5983 .maxlen = sizeof(int),
5984 .mode = 0644,
5985 .proc_handler = proc_dointvec,
5986 },
5987 {
5988 .procname = "accept_ra_min_hop_limit",
5989 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5990 .maxlen = sizeof(int),
5991 .mode = 0644,
5992 .proc_handler = proc_dointvec,
5993 },
5994 {
5995 .procname = "accept_ra_pinfo",
5996 .data = &ipv6_devconf.accept_ra_pinfo,
5997 .maxlen = sizeof(int),
5998 .mode = 0644,
5999 .proc_handler = proc_dointvec,
6000 },
6001 #ifdef CONFIG_IPV6_ROUTER_PREF
6002 {
6003 .procname = "accept_ra_rtr_pref",
6004 .data = &ipv6_devconf.accept_ra_rtr_pref,
6005 .maxlen = sizeof(int),
6006 .mode = 0644,
6007 .proc_handler = proc_dointvec,
6008 },
6009 {
6010 .procname = "router_probe_interval",
6011 .data = &ipv6_devconf.rtr_probe_interval,
6012 .maxlen = sizeof(int),
6013 .mode = 0644,
6014 .proc_handler = proc_dointvec_jiffies,
6015 },
6016 #ifdef CONFIG_IPV6_ROUTE_INFO
6017 {
6018 .procname = "accept_ra_rt_info_max_plen",
6019 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6020 .maxlen = sizeof(int),
6021 .mode = 0644,
6022 .proc_handler = proc_dointvec,
6023 },
6024 #endif
6025 #endif
6026 {
6027 .procname = "proxy_ndp",
6028 .data = &ipv6_devconf.proxy_ndp,
6029 .maxlen = sizeof(int),
6030 .mode = 0644,
6031 .proc_handler = addrconf_sysctl_proxy_ndp,
6032 },
6033 {
6034 .procname = "accept_source_route",
6035 .data = &ipv6_devconf.accept_source_route,
6036 .maxlen = sizeof(int),
6037 .mode = 0644,
6038 .proc_handler = proc_dointvec,
6039 },
6040 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6041 {
6042 .procname = "optimistic_dad",
6043 .data = &ipv6_devconf.optimistic_dad,
6044 .maxlen = sizeof(int),
6045 .mode = 0644,
6046 .proc_handler = proc_dointvec,
6047 },
6048 {
6049 .procname = "use_optimistic",
6050 .data = &ipv6_devconf.use_optimistic,
6051 .maxlen = sizeof(int),
6052 .mode = 0644,
6053 .proc_handler = proc_dointvec,
6054 },
6055 #endif
6056 #ifdef CONFIG_IPV6_MROUTE
6057 {
6058 .procname = "mc_forwarding",
6059 .data = &ipv6_devconf.mc_forwarding,
6060 .maxlen = sizeof(int),
6061 .mode = 0444,
6062 .proc_handler = proc_dointvec,
6063 },
6064 #endif
6065 {
6066 .procname = "disable_ipv6",
6067 .data = &ipv6_devconf.disable_ipv6,
6068 .maxlen = sizeof(int),
6069 .mode = 0644,
6070 .proc_handler = addrconf_sysctl_disable,
6071 },
6072 {
6073 .procname = "accept_dad",
6074 .data = &ipv6_devconf.accept_dad,
6075 .maxlen = sizeof(int),
6076 .mode = 0644,
6077 .proc_handler = proc_dointvec,
6078 },
6079 {
6080 .procname = "force_tllao",
6081 .data = &ipv6_devconf.force_tllao,
6082 .maxlen = sizeof(int),
6083 .mode = 0644,
6084 .proc_handler = proc_dointvec
6085 },
6086 {
6087 .procname = "ndisc_notify",
6088 .data = &ipv6_devconf.ndisc_notify,
6089 .maxlen = sizeof(int),
6090 .mode = 0644,
6091 .proc_handler = proc_dointvec
6092 },
6093 {
6094 .procname = "suppress_frag_ndisc",
6095 .data = &ipv6_devconf.suppress_frag_ndisc,
6096 .maxlen = sizeof(int),
6097 .mode = 0644,
6098 .proc_handler = proc_dointvec
6099 },
6100 {
6101 .procname = "accept_ra_from_local",
6102 .data = &ipv6_devconf.accept_ra_from_local,
6103 .maxlen = sizeof(int),
6104 .mode = 0644,
6105 .proc_handler = proc_dointvec,
6106 },
6107 {
6108 .procname = "accept_ra_mtu",
6109 .data = &ipv6_devconf.accept_ra_mtu,
6110 .maxlen = sizeof(int),
6111 .mode = 0644,
6112 .proc_handler = proc_dointvec,
6113 },
6114 {
6115 .procname = "stable_secret",
6116 .data = &ipv6_devconf.stable_secret,
6117 .maxlen = IPV6_MAX_STRLEN,
6118 .mode = 0600,
6119 .proc_handler = addrconf_sysctl_stable_secret,
6120 },
6121 {
6122 .procname = "use_oif_addrs_only",
6123 .data = &ipv6_devconf.use_oif_addrs_only,
6124 .maxlen = sizeof(int),
6125 .mode = 0644,
6126 .proc_handler = proc_dointvec,
6127 },
6128 {
6129 .procname = "ignore_routes_with_linkdown",
6130 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6131 .maxlen = sizeof(int),
6132 .mode = 0644,
6133 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6134 },
6135 {
6136 .procname = "drop_unicast_in_l2_multicast",
6137 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6138 .maxlen = sizeof(int),
6139 .mode = 0644,
6140 .proc_handler = proc_dointvec,
6141 },
6142 {
6143 .procname = "drop_unsolicited_na",
6144 .data = &ipv6_devconf.drop_unsolicited_na,
6145 .maxlen = sizeof(int),
6146 .mode = 0644,
6147 .proc_handler = proc_dointvec,
6148 },
6149 {
6150 .procname = "keep_addr_on_down",
6151 .data = &ipv6_devconf.keep_addr_on_down,
6152 .maxlen = sizeof(int),
6153 .mode = 0644,
6154 .proc_handler = proc_dointvec,
6155
6156 },
6157 {
6158 .procname = "seg6_enabled",
6159 .data = &ipv6_devconf.seg6_enabled,
6160 .maxlen = sizeof(int),
6161 .mode = 0644,
6162 .proc_handler = proc_dointvec,
6163 },
6164 #ifdef CONFIG_IPV6_SEG6_HMAC
6165 {
6166 .procname = "seg6_require_hmac",
6167 .data = &ipv6_devconf.seg6_require_hmac,
6168 .maxlen = sizeof(int),
6169 .mode = 0644,
6170 .proc_handler = proc_dointvec,
6171 },
6172 #endif
6173 {
6174 .procname = "enhanced_dad",
6175 .data = &ipv6_devconf.enhanced_dad,
6176 .maxlen = sizeof(int),
6177 .mode = 0644,
6178 .proc_handler = proc_dointvec,
6179 },
6180 {
6181 .procname = "addr_gen_mode",
6182 .data = &ipv6_devconf.addr_gen_mode,
6183 .maxlen = sizeof(int),
6184 .mode = 0644,
6185 .proc_handler = addrconf_sysctl_addr_gen_mode,
6186 },
6187 {
6188 /* sentinel */
6189 }
6190 };
6191
6192 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6193 struct inet6_dev *idev, struct ipv6_devconf *p)
6194 {
6195 int i, ifindex;
6196 struct ctl_table *table;
6197 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6198
6199 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6200 if (!table)
6201 goto out;
6202
6203 for (i = 0; table[i].data; i++) {
6204 table[i].data += (char *)p - (char *)&ipv6_devconf;
6205 /* If one of these is already set, then it is not safe to
6206 * overwrite either of them: this makes proc_dointvec_minmax
6207 * usable.
6208 */
6209 if (!table[i].extra1 && !table[i].extra2) {
6210 table[i].extra1 = idev; /* embedded; no ref */
6211 table[i].extra2 = net;
6212 }
6213 }
6214
6215 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6216
6217 p->sysctl_header = register_net_sysctl(net, path, table);
6218 if (!p->sysctl_header)
6219 goto free;
6220
6221 if (!strcmp(dev_name, "all"))
6222 ifindex = NETCONFA_IFINDEX_ALL;
6223 else if (!strcmp(dev_name, "default"))
6224 ifindex = NETCONFA_IFINDEX_DEFAULT;
6225 else
6226 ifindex = idev->dev->ifindex;
6227 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
6228 return 0;
6229
6230 free:
6231 kfree(table);
6232 out:
6233 return -ENOBUFS;
6234 }
6235
6236 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6237 {
6238 struct ctl_table *table;
6239
6240 if (!p->sysctl_header)
6241 return;
6242
6243 table = p->sysctl_header->ctl_table_arg;
6244 unregister_net_sysctl_table(p->sysctl_header);
6245 p->sysctl_header = NULL;
6246 kfree(table);
6247 }
6248
6249 static int addrconf_sysctl_register(struct inet6_dev *idev)
6250 {
6251 int err;
6252
6253 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6254 return -EINVAL;
6255
6256 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6257 &ndisc_ifinfo_sysctl_change);
6258 if (err)
6259 return err;
6260 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6261 idev, &idev->cnf);
6262 if (err)
6263 neigh_sysctl_unregister(idev->nd_parms);
6264
6265 return err;
6266 }
6267
6268 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6269 {
6270 __addrconf_sysctl_unregister(&idev->cnf);
6271 neigh_sysctl_unregister(idev->nd_parms);
6272 }
6273
6274
6275 #endif
6276
6277 static int __net_init addrconf_init_net(struct net *net)
6278 {
6279 int err = -ENOMEM;
6280 struct ipv6_devconf *all, *dflt;
6281
6282 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6283 if (!all)
6284 goto err_alloc_all;
6285
6286 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6287 if (!dflt)
6288 goto err_alloc_dflt;
6289
6290 /* these will be inherited by all namespaces */
6291 dflt->autoconf = ipv6_defaults.autoconf;
6292 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6293
6294 dflt->stable_secret.initialized = false;
6295 all->stable_secret.initialized = false;
6296
6297 net->ipv6.devconf_all = all;
6298 net->ipv6.devconf_dflt = dflt;
6299
6300 #ifdef CONFIG_SYSCTL
6301 err = __addrconf_sysctl_register(net, "all", NULL, all);
6302 if (err < 0)
6303 goto err_reg_all;
6304
6305 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6306 if (err < 0)
6307 goto err_reg_dflt;
6308 #endif
6309 return 0;
6310
6311 #ifdef CONFIG_SYSCTL
6312 err_reg_dflt:
6313 __addrconf_sysctl_unregister(all);
6314 err_reg_all:
6315 kfree(dflt);
6316 #endif
6317 err_alloc_dflt:
6318 kfree(all);
6319 err_alloc_all:
6320 return err;
6321 }
6322
6323 static void __net_exit addrconf_exit_net(struct net *net)
6324 {
6325 #ifdef CONFIG_SYSCTL
6326 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6327 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6328 #endif
6329 kfree(net->ipv6.devconf_dflt);
6330 kfree(net->ipv6.devconf_all);
6331 }
6332
6333 static struct pernet_operations addrconf_ops = {
6334 .init = addrconf_init_net,
6335 .exit = addrconf_exit_net,
6336 };
6337
6338 static struct rtnl_af_ops inet6_ops __read_mostly = {
6339 .family = AF_INET6,
6340 .fill_link_af = inet6_fill_link_af,
6341 .get_link_af_size = inet6_get_link_af_size,
6342 .validate_link_af = inet6_validate_link_af,
6343 .set_link_af = inet6_set_link_af,
6344 };
6345
6346 /*
6347 * Init / cleanup code
6348 */
6349
6350 int __init addrconf_init(void)
6351 {
6352 struct inet6_dev *idev;
6353 int i, err;
6354
6355 err = ipv6_addr_label_init();
6356 if (err < 0) {
6357 pr_crit("%s: cannot initialize default policy table: %d\n",
6358 __func__, err);
6359 goto out;
6360 }
6361
6362 err = register_pernet_subsys(&addrconf_ops);
6363 if (err < 0)
6364 goto out_addrlabel;
6365
6366 addrconf_wq = create_workqueue("ipv6_addrconf");
6367 if (!addrconf_wq) {
6368 err = -ENOMEM;
6369 goto out_nowq;
6370 }
6371
6372 /* The addrconf netdev notifier requires that loopback_dev
6373 * has it's ipv6 private information allocated and setup
6374 * before it can bring up and give link-local addresses
6375 * to other devices which are up.
6376 *
6377 * Unfortunately, loopback_dev is not necessarily the first
6378 * entry in the global dev_base list of net devices. In fact,
6379 * it is likely to be the very last entry on that list.
6380 * So this causes the notifier registry below to try and
6381 * give link-local addresses to all devices besides loopback_dev
6382 * first, then loopback_dev, which cases all the non-loopback_dev
6383 * devices to fail to get a link-local address.
6384 *
6385 * So, as a temporary fix, allocate the ipv6 structure for
6386 * loopback_dev first by hand.
6387 * Longer term, all of the dependencies ipv6 has upon the loopback
6388 * device and it being up should be removed.
6389 */
6390 rtnl_lock();
6391 idev = ipv6_add_dev(init_net.loopback_dev);
6392 rtnl_unlock();
6393 if (IS_ERR(idev)) {
6394 err = PTR_ERR(idev);
6395 goto errlo;
6396 }
6397
6398 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6399 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6400
6401 register_netdevice_notifier(&ipv6_dev_notf);
6402
6403 addrconf_verify();
6404
6405 rtnl_af_register(&inet6_ops);
6406
6407 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6408 NULL);
6409 if (err < 0)
6410 goto errout;
6411
6412 /* Only the first call to __rtnl_register can fail */
6413 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6414 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6415 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6416 inet6_dump_ifaddr, NULL);
6417 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6418 inet6_dump_ifmcaddr, NULL);
6419 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6420 inet6_dump_ifacaddr, NULL);
6421 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6422 inet6_netconf_dump_devconf, NULL);
6423
6424 ipv6_addr_label_rtnl_register();
6425
6426 return 0;
6427 errout:
6428 rtnl_af_unregister(&inet6_ops);
6429 unregister_netdevice_notifier(&ipv6_dev_notf);
6430 errlo:
6431 destroy_workqueue(addrconf_wq);
6432 out_nowq:
6433 unregister_pernet_subsys(&addrconf_ops);
6434 out_addrlabel:
6435 ipv6_addr_label_cleanup();
6436 out:
6437 return err;
6438 }
6439
6440 void addrconf_cleanup(void)
6441 {
6442 struct net_device *dev;
6443 int i;
6444
6445 unregister_netdevice_notifier(&ipv6_dev_notf);
6446 unregister_pernet_subsys(&addrconf_ops);
6447 ipv6_addr_label_cleanup();
6448
6449 rtnl_lock();
6450
6451 __rtnl_af_unregister(&inet6_ops);
6452
6453 /* clean dev list */
6454 for_each_netdev(&init_net, dev) {
6455 if (__in6_dev_get(dev) == NULL)
6456 continue;
6457 addrconf_ifdown(dev, 1);
6458 }
6459 addrconf_ifdown(init_net.loopback_dev, 2);
6460
6461 /*
6462 * Check hash table.
6463 */
6464 spin_lock_bh(&addrconf_hash_lock);
6465 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6466 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6467 spin_unlock_bh(&addrconf_hash_lock);
6468 cancel_delayed_work(&addr_chk_work);
6469 rtnl_unlock();
6470
6471 destroy_workqueue(addrconf_wq);
6472 }
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