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Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[linux/fpc-iii.git] / net / ipv6 / addrconf.c
blob3c46e9513a31d04eeb1e76384f146b759ae38eed
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_min_plen = 0,
228 .accept_ra_rt_info_max_plen = 0,
229 #endif
230 #endif
231 .proxy_ndp = 0,
232 .accept_source_route = 0, /* we do not accept RH0 by default. */
233 .disable_ipv6 = 0,
234 .accept_dad = 1,
235 .suppress_frag_ndisc = 1,
236 .accept_ra_mtu = 1,
237 .stable_secret = {
238 .initialized = false,
239 },
240 .use_oif_addrs_only = 0,
241 .ignore_routes_with_linkdown = 0,
242 .keep_addr_on_down = 0,
243 .seg6_enabled = 0,
244 #ifdef CONFIG_IPV6_SEG6_HMAC
245 .seg6_require_hmac = 0,
246 #endif
247 .enhanced_dad = 1,
248 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
249 .disable_policy = 0,
250 };
251
252 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
253 .forwarding = 0,
254 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
255 .mtu6 = IPV6_MIN_MTU,
256 .accept_ra = 1,
257 .accept_redirects = 1,
258 .autoconf = 1,
259 .force_mld_version = 0,
260 .mldv1_unsolicited_report_interval = 10 * HZ,
261 .mldv2_unsolicited_report_interval = HZ,
262 .dad_transmits = 1,
263 .rtr_solicits = MAX_RTR_SOLICITATIONS,
264 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
265 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
266 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
267 .use_tempaddr = 0,
268 .temp_valid_lft = TEMP_VALID_LIFETIME,
269 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
270 .regen_max_retry = REGEN_MAX_RETRY,
271 .max_desync_factor = MAX_DESYNC_FACTOR,
272 .max_addresses = IPV6_MAX_ADDRESSES,
273 .accept_ra_defrtr = 1,
274 .accept_ra_from_local = 0,
275 .accept_ra_min_hop_limit= 1,
276 .accept_ra_pinfo = 1,
277 #ifdef CONFIG_IPV6_ROUTER_PREF
278 .accept_ra_rtr_pref = 1,
279 .rtr_probe_interval = 60 * HZ,
280 #ifdef CONFIG_IPV6_ROUTE_INFO
281 .accept_ra_rt_info_min_plen = 0,
282 .accept_ra_rt_info_max_plen = 0,
283 #endif
284 #endif
285 .proxy_ndp = 0,
286 .accept_source_route = 0, /* we do not accept RH0 by default. */
287 .disable_ipv6 = 0,
288 .accept_dad = 1,
289 .suppress_frag_ndisc = 1,
290 .accept_ra_mtu = 1,
291 .stable_secret = {
292 .initialized = false,
293 },
294 .use_oif_addrs_only = 0,
295 .ignore_routes_with_linkdown = 0,
296 .keep_addr_on_down = 0,
297 .seg6_enabled = 0,
298 #ifdef CONFIG_IPV6_SEG6_HMAC
299 .seg6_require_hmac = 0,
300 #endif
301 .enhanced_dad = 1,
302 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
303 .disable_policy = 0,
304 };
305
306 /* Check if a valid qdisc is available */
307 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
308 {
309 return !qdisc_tx_is_noop(dev);
310 }
311
312 static void addrconf_del_rs_timer(struct inet6_dev *idev)
313 {
314 if (del_timer(&idev->rs_timer))
315 __in6_dev_put(idev);
316 }
317
318 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
319 {
320 if (cancel_delayed_work(&ifp->dad_work))
321 __in6_ifa_put(ifp);
322 }
323
324 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
325 unsigned long when)
326 {
327 if (!timer_pending(&idev->rs_timer))
328 in6_dev_hold(idev);
329 mod_timer(&idev->rs_timer, jiffies + when);
330 }
331
332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
333 unsigned long delay)
334 {
335 in6_ifa_hold(ifp);
336 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
337 in6_ifa_put(ifp);
338 }
339
340 static int snmp6_alloc_dev(struct inet6_dev *idev)
341 {
342 int i;
343
344 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
345 if (!idev->stats.ipv6)
346 goto err_ip;
347
348 for_each_possible_cpu(i) {
349 struct ipstats_mib *addrconf_stats;
350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
351 u64_stats_init(&addrconf_stats->syncp);
352 }
353
354
355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
356 GFP_KERNEL);
357 if (!idev->stats.icmpv6dev)
358 goto err_icmp;
359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
360 GFP_KERNEL);
361 if (!idev->stats.icmpv6msgdev)
362 goto err_icmpmsg;
363
364 return 0;
365
366 err_icmpmsg:
367 kfree(idev->stats.icmpv6dev);
368 err_icmp:
369 free_percpu(idev->stats.ipv6);
370 err_ip:
371 return -ENOMEM;
372 }
373
374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
375 {
376 struct inet6_dev *ndev;
377 int err = -ENOMEM;
378
379 ASSERT_RTNL();
380
381 if (dev->mtu < IPV6_MIN_MTU)
382 return ERR_PTR(-EINVAL);
383
384 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
385 if (!ndev)
386 return ERR_PTR(err);
387
388 rwlock_init(&ndev->lock);
389 ndev->dev = dev;
390 INIT_LIST_HEAD(&ndev->addr_list);
391 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
392 (unsigned long)ndev);
393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
394
395 if (ndev->cnf.stable_secret.initialized)
396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
397 else
398 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
399
400 ndev->cnf.mtu6 = dev->mtu;
401 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
402 if (!ndev->nd_parms) {
403 kfree(ndev);
404 return ERR_PTR(err);
405 }
406 if (ndev->cnf.forwarding)
407 dev_disable_lro(dev);
408 /* We refer to the device */
409 dev_hold(dev);
410
411 if (snmp6_alloc_dev(ndev) < 0) {
412 ADBG(KERN_WARNING
413 "%s: cannot allocate memory for statistics; dev=%s.\n",
414 __func__, dev->name);
415 neigh_parms_release(&nd_tbl, ndev->nd_parms);
416 dev_put(dev);
417 kfree(ndev);
418 return ERR_PTR(err);
419 }
420
421 if (snmp6_register_dev(ndev) < 0) {
422 ADBG(KERN_WARNING
423 "%s: cannot create /proc/net/dev_snmp6/%s\n",
424 __func__, dev->name);
425 goto err_release;
426 }
427
428 /* One reference from device. */
429 refcount_set(&ndev->refcnt, 1);
430
431 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
432 ndev->cnf.accept_dad = -1;
433
434 #if IS_ENABLED(CONFIG_IPV6_SIT)
435 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
436 pr_info("%s: Disabled Multicast RS\n", dev->name);
437 ndev->cnf.rtr_solicits = 0;
438 }
439 #endif
440
441 INIT_LIST_HEAD(&ndev->tempaddr_list);
442 ndev->desync_factor = U32_MAX;
443 if ((dev->flags&IFF_LOOPBACK) ||
444 dev->type == ARPHRD_TUNNEL ||
445 dev->type == ARPHRD_TUNNEL6 ||
446 dev->type == ARPHRD_SIT ||
447 dev->type == ARPHRD_NONE) {
448 ndev->cnf.use_tempaddr = -1;
449 } else
450 ipv6_regen_rndid(ndev);
451
452 ndev->token = in6addr_any;
453
454 if (netif_running(dev) && addrconf_qdisc_ok(dev))
455 ndev->if_flags |= IF_READY;
456
457 ipv6_mc_init_dev(ndev);
458 ndev->tstamp = jiffies;
459 err = addrconf_sysctl_register(ndev);
460 if (err) {
461 ipv6_mc_destroy_dev(ndev);
462 snmp6_unregister_dev(ndev);
463 goto err_release;
464 }
465 /* protected by rtnl_lock */
466 rcu_assign_pointer(dev->ip6_ptr, ndev);
467
468 /* Join interface-local all-node multicast group */
469 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
470
471 /* Join all-node multicast group */
472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
473
474 /* Join all-router multicast group if forwarding is set */
475 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477
478 return ndev;
479
480 err_release:
481 neigh_parms_release(&nd_tbl, ndev->nd_parms);
482 ndev->dead = 1;
483 in6_dev_finish_destroy(ndev);
484 return ERR_PTR(err);
485 }
486
487 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
488 {
489 struct inet6_dev *idev;
490
491 ASSERT_RTNL();
492
493 idev = __in6_dev_get(dev);
494 if (!idev) {
495 idev = ipv6_add_dev(dev);
496 if (IS_ERR(idev))
497 return NULL;
498 }
499
500 if (dev->flags&IFF_UP)
501 ipv6_mc_up(idev);
502 return idev;
503 }
504
505 static int inet6_netconf_msgsize_devconf(int type)
506 {
507 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
508 + nla_total_size(4); /* NETCONFA_IFINDEX */
509 bool all = false;
510
511 if (type == NETCONFA_ALL)
512 all = true;
513
514 if (all || type == NETCONFA_FORWARDING)
515 size += nla_total_size(4);
516 #ifdef CONFIG_IPV6_MROUTE
517 if (all || type == NETCONFA_MC_FORWARDING)
518 size += nla_total_size(4);
519 #endif
520 if (all || type == NETCONFA_PROXY_NEIGH)
521 size += nla_total_size(4);
522
523 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
524 size += nla_total_size(4);
525
526 return size;
527 }
528
529 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
530 struct ipv6_devconf *devconf, u32 portid,
531 u32 seq, int event, unsigned int flags,
532 int type)
533 {
534 struct nlmsghdr *nlh;
535 struct netconfmsg *ncm;
536 bool all = false;
537
538 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
539 flags);
540 if (!nlh)
541 return -EMSGSIZE;
542
543 if (type == NETCONFA_ALL)
544 all = true;
545
546 ncm = nlmsg_data(nlh);
547 ncm->ncm_family = AF_INET6;
548
549 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
550 goto nla_put_failure;
551
552 if (!devconf)
553 goto out;
554
555 if ((all || type == NETCONFA_FORWARDING) &&
556 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
557 goto nla_put_failure;
558 #ifdef CONFIG_IPV6_MROUTE
559 if ((all || type == NETCONFA_MC_FORWARDING) &&
560 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
561 devconf->mc_forwarding) < 0)
562 goto nla_put_failure;
563 #endif
564 if ((all || type == NETCONFA_PROXY_NEIGH) &&
565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
566 goto nla_put_failure;
567
568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
570 devconf->ignore_routes_with_linkdown) < 0)
571 goto nla_put_failure;
572
573 out:
574 nlmsg_end(skb, nlh);
575 return 0;
576
577 nla_put_failure:
578 nlmsg_cancel(skb, nlh);
579 return -EMSGSIZE;
580 }
581
582 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
583 int ifindex, struct ipv6_devconf *devconf)
584 {
585 struct sk_buff *skb;
586 int err = -ENOBUFS;
587
588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
589 if (!skb)
590 goto errout;
591
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
593 event, 0, type);
594 if (err < 0) {
595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
596 WARN_ON(err == -EMSGSIZE);
597 kfree_skb(skb);
598 goto errout;
599 }
600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
601 return;
602 errout:
603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
604 }
605
606 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
607 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
608 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
611 };
612
613 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
614 struct nlmsghdr *nlh,
615 struct netlink_ext_ack *extack)
616 {
617 struct net *net = sock_net(in_skb->sk);
618 struct nlattr *tb[NETCONFA_MAX+1];
619 struct netconfmsg *ncm;
620 struct sk_buff *skb;
621 struct ipv6_devconf *devconf;
622 struct inet6_dev *in6_dev;
623 struct net_device *dev;
624 int ifindex;
625 int err;
626
627 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
628 devconf_ipv6_policy, extack);
629 if (err < 0)
630 goto errout;
631
632 err = -EINVAL;
633 if (!tb[NETCONFA_IFINDEX])
634 goto errout;
635
636 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
637 switch (ifindex) {
638 case NETCONFA_IFINDEX_ALL:
639 devconf = net->ipv6.devconf_all;
640 break;
641 case NETCONFA_IFINDEX_DEFAULT:
642 devconf = net->ipv6.devconf_dflt;
643 break;
644 default:
645 dev = __dev_get_by_index(net, ifindex);
646 if (!dev)
647 goto errout;
648 in6_dev = __in6_dev_get(dev);
649 if (!in6_dev)
650 goto errout;
651 devconf = &in6_dev->cnf;
652 break;
653 }
654
655 err = -ENOBUFS;
656 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
657 if (!skb)
658 goto errout;
659
660 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
661 NETLINK_CB(in_skb).portid,
662 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
663 NETCONFA_ALL);
664 if (err < 0) {
665 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
666 WARN_ON(err == -EMSGSIZE);
667 kfree_skb(skb);
668 goto errout;
669 }
670 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
671 errout:
672 return err;
673 }
674
675 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
676 struct netlink_callback *cb)
677 {
678 struct net *net = sock_net(skb->sk);
679 int h, s_h;
680 int idx, s_idx;
681 struct net_device *dev;
682 struct inet6_dev *idev;
683 struct hlist_head *head;
684
685 s_h = cb->args[0];
686 s_idx = idx = cb->args[1];
687
688 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
689 idx = 0;
690 head = &net->dev_index_head[h];
691 rcu_read_lock();
692 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
693 net->dev_base_seq;
694 hlist_for_each_entry_rcu(dev, head, index_hlist) {
695 if (idx < s_idx)
696 goto cont;
697 idev = __in6_dev_get(dev);
698 if (!idev)
699 goto cont;
700
701 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
702 &idev->cnf,
703 NETLINK_CB(cb->skb).portid,
704 cb->nlh->nlmsg_seq,
705 RTM_NEWNETCONF,
706 NLM_F_MULTI,
707 NETCONFA_ALL) < 0) {
708 rcu_read_unlock();
709 goto done;
710 }
711 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
712 cont:
713 idx++;
714 }
715 rcu_read_unlock();
716 }
717 if (h == NETDEV_HASHENTRIES) {
718 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
719 net->ipv6.devconf_all,
720 NETLINK_CB(cb->skb).portid,
721 cb->nlh->nlmsg_seq,
722 RTM_NEWNETCONF, NLM_F_MULTI,
723 NETCONFA_ALL) < 0)
724 goto done;
725 else
726 h++;
727 }
728 if (h == NETDEV_HASHENTRIES + 1) {
729 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
730 net->ipv6.devconf_dflt,
731 NETLINK_CB(cb->skb).portid,
732 cb->nlh->nlmsg_seq,
733 RTM_NEWNETCONF, NLM_F_MULTI,
734 NETCONFA_ALL) < 0)
735 goto done;
736 else
737 h++;
738 }
739 done:
740 cb->args[0] = h;
741 cb->args[1] = idx;
742
743 return skb->len;
744 }
745
746 #ifdef CONFIG_SYSCTL
747 static void dev_forward_change(struct inet6_dev *idev)
748 {
749 struct net_device *dev;
750 struct inet6_ifaddr *ifa;
751
752 if (!idev)
753 return;
754 dev = idev->dev;
755 if (idev->cnf.forwarding)
756 dev_disable_lro(dev);
757 if (dev->flags & IFF_MULTICAST) {
758 if (idev->cnf.forwarding) {
759 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
760 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
761 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
762 } else {
763 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
764 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
765 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
766 }
767 }
768
769 list_for_each_entry(ifa, &idev->addr_list, if_list) {
770 if (ifa->flags&IFA_F_TENTATIVE)
771 continue;
772 if (idev->cnf.forwarding)
773 addrconf_join_anycast(ifa);
774 else
775 addrconf_leave_anycast(ifa);
776 }
777 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
778 NETCONFA_FORWARDING,
779 dev->ifindex, &idev->cnf);
780 }
781
782
783 static void addrconf_forward_change(struct net *net, __s32 newf)
784 {
785 struct net_device *dev;
786 struct inet6_dev *idev;
787
788 for_each_netdev(net, dev) {
789 idev = __in6_dev_get(dev);
790 if (idev) {
791 int changed = (!idev->cnf.forwarding) ^ (!newf);
792 idev->cnf.forwarding = newf;
793 if (changed)
794 dev_forward_change(idev);
795 }
796 }
797 }
798
799 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
800 {
801 struct net *net;
802 int old;
803
804 if (!rtnl_trylock())
805 return restart_syscall();
806
807 net = (struct net *)table->extra2;
808 old = *p;
809 *p = newf;
810
811 if (p == &net->ipv6.devconf_dflt->forwarding) {
812 if ((!newf) ^ (!old))
813 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
814 NETCONFA_FORWARDING,
815 NETCONFA_IFINDEX_DEFAULT,
816 net->ipv6.devconf_dflt);
817 rtnl_unlock();
818 return 0;
819 }
820
821 if (p == &net->ipv6.devconf_all->forwarding) {
822 int old_dflt = net->ipv6.devconf_dflt->forwarding;
823
824 net->ipv6.devconf_dflt->forwarding = newf;
825 if ((!newf) ^ (!old_dflt))
826 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
827 NETCONFA_FORWARDING,
828 NETCONFA_IFINDEX_DEFAULT,
829 net->ipv6.devconf_dflt);
830
831 addrconf_forward_change(net, newf);
832 if ((!newf) ^ (!old))
833 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
834 NETCONFA_FORWARDING,
835 NETCONFA_IFINDEX_ALL,
836 net->ipv6.devconf_all);
837 } else if ((!newf) ^ (!old))
838 dev_forward_change((struct inet6_dev *)table->extra1);
839 rtnl_unlock();
840
841 if (newf)
842 rt6_purge_dflt_routers(net);
843 return 1;
844 }
845
846 static void addrconf_linkdown_change(struct net *net, __s32 newf)
847 {
848 struct net_device *dev;
849 struct inet6_dev *idev;
850
851 for_each_netdev(net, dev) {
852 idev = __in6_dev_get(dev);
853 if (idev) {
854 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
855
856 idev->cnf.ignore_routes_with_linkdown = newf;
857 if (changed)
858 inet6_netconf_notify_devconf(dev_net(dev),
859 RTM_NEWNETCONF,
860 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
861 dev->ifindex,
862 &idev->cnf);
863 }
864 }
865 }
866
867 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
868 {
869 struct net *net;
870 int old;
871
872 if (!rtnl_trylock())
873 return restart_syscall();
874
875 net = (struct net *)table->extra2;
876 old = *p;
877 *p = newf;
878
879 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
880 if ((!newf) ^ (!old))
881 inet6_netconf_notify_devconf(net,
882 RTM_NEWNETCONF,
883 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
884 NETCONFA_IFINDEX_DEFAULT,
885 net->ipv6.devconf_dflt);
886 rtnl_unlock();
887 return 0;
888 }
889
890 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
891 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
892 addrconf_linkdown_change(net, newf);
893 if ((!newf) ^ (!old))
894 inet6_netconf_notify_devconf(net,
895 RTM_NEWNETCONF,
896 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
897 NETCONFA_IFINDEX_ALL,
898 net->ipv6.devconf_all);
899 }
900 rtnl_unlock();
901
902 return 1;
903 }
904
905 #endif
906
907 /* Nobody refers to this ifaddr, destroy it */
908 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
909 {
910 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
911
912 #ifdef NET_REFCNT_DEBUG
913 pr_debug("%s\n", __func__);
914 #endif
915
916 in6_dev_put(ifp->idev);
917
918 if (cancel_delayed_work(&ifp->dad_work))
919 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
920 ifp);
921
922 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
923 pr_warn("Freeing alive inet6 address %p\n", ifp);
924 return;
925 }
926 ip6_rt_put(ifp->rt);
927
928 kfree_rcu(ifp, rcu);
929 }
930
931 static void
932 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
933 {
934 struct list_head *p;
935 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
936
937 /*
938 * Each device address list is sorted in order of scope -
939 * global before linklocal.
940 */
941 list_for_each(p, &idev->addr_list) {
942 struct inet6_ifaddr *ifa
943 = list_entry(p, struct inet6_ifaddr, if_list);
944 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
945 break;
946 }
947
948 list_add_tail(&ifp->if_list, p);
949 }
950
951 static u32 inet6_addr_hash(const struct in6_addr *addr)
952 {
953 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
954 }
955
956 /* On success it returns ifp with increased reference count */
957
958 static struct inet6_ifaddr *
959 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
960 const struct in6_addr *peer_addr, int pfxlen,
961 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
962 {
963 struct net *net = dev_net(idev->dev);
964 struct inet6_ifaddr *ifa = NULL;
965 struct rt6_info *rt;
966 struct in6_validator_info i6vi;
967 unsigned int hash;
968 int err = 0;
969 int addr_type = ipv6_addr_type(addr);
970
971 if (addr_type == IPV6_ADDR_ANY ||
972 addr_type & IPV6_ADDR_MULTICAST ||
973 (!(idev->dev->flags & IFF_LOOPBACK) &&
974 addr_type & IPV6_ADDR_LOOPBACK))
975 return ERR_PTR(-EADDRNOTAVAIL);
976
977 rcu_read_lock_bh();
978
979 in6_dev_hold(idev);
980
981 if (idev->dead) {
982 err = -ENODEV; /*XXX*/
983 goto out2;
984 }
985
986 if (idev->cnf.disable_ipv6) {
987 err = -EACCES;
988 goto out2;
989 }
990
991 i6vi.i6vi_addr = *addr;
992 i6vi.i6vi_dev = idev;
993 rcu_read_unlock_bh();
994
995 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
996
997 rcu_read_lock_bh();
998 err = notifier_to_errno(err);
999 if (err)
1000 goto out2;
1001
1002 spin_lock(&addrconf_hash_lock);
1003
1004 /* Ignore adding duplicate addresses on an interface */
1005 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
1006 ADBG("ipv6_add_addr: already assigned\n");
1007 err = -EEXIST;
1008 goto out;
1009 }
1010
1011 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
1012
1013 if (!ifa) {
1014 ADBG("ipv6_add_addr: malloc failed\n");
1015 err = -ENOBUFS;
1016 goto out;
1017 }
1018
1019 rt = addrconf_dst_alloc(idev, addr, false);
1020 if (IS_ERR(rt)) {
1021 err = PTR_ERR(rt);
1022 goto out;
1023 }
1024
1025 if (net->ipv6.devconf_all->disable_policy ||
1026 idev->cnf.disable_policy)
1027 rt->dst.flags |= DST_NOPOLICY;
1028
1029 neigh_parms_data_state_setall(idev->nd_parms);
1030
1031 ifa->addr = *addr;
1032 if (peer_addr)
1033 ifa->peer_addr = *peer_addr;
1034
1035 spin_lock_init(&ifa->lock);
1036 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1037 INIT_HLIST_NODE(&ifa->addr_lst);
1038 ifa->scope = scope;
1039 ifa->prefix_len = pfxlen;
1040 ifa->flags = flags;
1041 /* No need to add the TENTATIVE flag for addresses with NODAD */
1042 if (!(flags & IFA_F_NODAD))
1043 ifa->flags |= IFA_F_TENTATIVE;
1044 ifa->valid_lft = valid_lft;
1045 ifa->prefered_lft = prefered_lft;
1046 ifa->cstamp = ifa->tstamp = jiffies;
1047 ifa->tokenized = false;
1048
1049 ifa->rt = rt;
1050
1051 ifa->idev = idev;
1052 /* For caller */
1053 refcount_set(&ifa->refcnt, 1);
1054
1055 /* Add to big hash table */
1056 hash = inet6_addr_hash(addr);
1057
1058 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1059 spin_unlock(&addrconf_hash_lock);
1060
1061 write_lock(&idev->lock);
1062 /* Add to inet6_dev unicast addr list. */
1063 ipv6_link_dev_addr(idev, ifa);
1064
1065 if (ifa->flags&IFA_F_TEMPORARY) {
1066 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1067 in6_ifa_hold(ifa);
1068 }
1069
1070 in6_ifa_hold(ifa);
1071 write_unlock(&idev->lock);
1072 out2:
1073 rcu_read_unlock_bh();
1074
1075 if (likely(err == 0))
1076 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1077 else {
1078 kfree(ifa);
1079 in6_dev_put(idev);
1080 ifa = ERR_PTR(err);
1081 }
1082
1083 return ifa;
1084 out:
1085 spin_unlock(&addrconf_hash_lock);
1086 goto out2;
1087 }
1088
1089 enum cleanup_prefix_rt_t {
1090 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1091 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1092 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1093 };
1094
1095 /*
1096 * Check, whether the prefix for ifp would still need a prefix route
1097 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1098 * constants.
1099 *
1100 * 1) we don't purge prefix if address was not permanent.
1101 * prefix is managed by its own lifetime.
1102 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1103 * 3) if there are no addresses, delete prefix.
1104 * 4) if there are still other permanent address(es),
1105 * corresponding prefix is still permanent.
1106 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1107 * don't purge the prefix, assume user space is managing it.
1108 * 6) otherwise, update prefix lifetime to the
1109 * longest valid lifetime among the corresponding
1110 * addresses on the device.
1111 * Note: subsequent RA will update lifetime.
1112 **/
1113 static enum cleanup_prefix_rt_t
1114 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1115 {
1116 struct inet6_ifaddr *ifa;
1117 struct inet6_dev *idev = ifp->idev;
1118 unsigned long lifetime;
1119 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1120
1121 *expires = jiffies;
1122
1123 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1124 if (ifa == ifp)
1125 continue;
1126 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1127 ifp->prefix_len))
1128 continue;
1129 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1130 return CLEANUP_PREFIX_RT_NOP;
1131
1132 action = CLEANUP_PREFIX_RT_EXPIRE;
1133
1134 spin_lock(&ifa->lock);
1135
1136 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1137 /*
1138 * Note: Because this address is
1139 * not permanent, lifetime <
1140 * LONG_MAX / HZ here.
1141 */
1142 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1143 *expires = ifa->tstamp + lifetime * HZ;
1144 spin_unlock(&ifa->lock);
1145 }
1146
1147 return action;
1148 }
1149
1150 static void
1151 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1152 {
1153 struct rt6_info *rt;
1154
1155 rt = addrconf_get_prefix_route(&ifp->addr,
1156 ifp->prefix_len,
1157 ifp->idev->dev,
1158 0, RTF_GATEWAY | RTF_DEFAULT);
1159 if (rt) {
1160 if (del_rt)
1161 ip6_del_rt(rt);
1162 else {
1163 if (!(rt->rt6i_flags & RTF_EXPIRES))
1164 rt6_set_expires(rt, expires);
1165 ip6_rt_put(rt);
1166 }
1167 }
1168 }
1169
1170
1171 /* This function wants to get referenced ifp and releases it before return */
1172
1173 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1174 {
1175 int state;
1176 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1177 unsigned long expires;
1178
1179 ASSERT_RTNL();
1180
1181 spin_lock_bh(&ifp->lock);
1182 state = ifp->state;
1183 ifp->state = INET6_IFADDR_STATE_DEAD;
1184 spin_unlock_bh(&ifp->lock);
1185
1186 if (state == INET6_IFADDR_STATE_DEAD)
1187 goto out;
1188
1189 spin_lock_bh(&addrconf_hash_lock);
1190 hlist_del_init_rcu(&ifp->addr_lst);
1191 spin_unlock_bh(&addrconf_hash_lock);
1192
1193 write_lock_bh(&ifp->idev->lock);
1194
1195 if (ifp->flags&IFA_F_TEMPORARY) {
1196 list_del(&ifp->tmp_list);
1197 if (ifp->ifpub) {
1198 in6_ifa_put(ifp->ifpub);
1199 ifp->ifpub = NULL;
1200 }
1201 __in6_ifa_put(ifp);
1202 }
1203
1204 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1205 action = check_cleanup_prefix_route(ifp, &expires);
1206
1207 list_del_init(&ifp->if_list);
1208 __in6_ifa_put(ifp);
1209
1210 write_unlock_bh(&ifp->idev->lock);
1211
1212 addrconf_del_dad_work(ifp);
1213
1214 ipv6_ifa_notify(RTM_DELADDR, ifp);
1215
1216 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1217
1218 if (action != CLEANUP_PREFIX_RT_NOP) {
1219 cleanup_prefix_route(ifp, expires,
1220 action == CLEANUP_PREFIX_RT_DEL);
1221 }
1222
1223 /* clean up prefsrc entries */
1224 rt6_remove_prefsrc(ifp);
1225 out:
1226 in6_ifa_put(ifp);
1227 }
1228
1229 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1230 {
1231 struct inet6_dev *idev = ifp->idev;
1232 struct in6_addr addr, *tmpaddr;
1233 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1234 unsigned long regen_advance;
1235 int tmp_plen;
1236 int ret = 0;
1237 u32 addr_flags;
1238 unsigned long now = jiffies;
1239 long max_desync_factor;
1240 s32 cnf_temp_preferred_lft;
1241
1242 write_lock_bh(&idev->lock);
1243 if (ift) {
1244 spin_lock_bh(&ift->lock);
1245 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1246 spin_unlock_bh(&ift->lock);
1247 tmpaddr = &addr;
1248 } else {
1249 tmpaddr = NULL;
1250 }
1251 retry:
1252 in6_dev_hold(idev);
1253 if (idev->cnf.use_tempaddr <= 0) {
1254 write_unlock_bh(&idev->lock);
1255 pr_info("%s: use_tempaddr is disabled\n", __func__);
1256 in6_dev_put(idev);
1257 ret = -1;
1258 goto out;
1259 }
1260 spin_lock_bh(&ifp->lock);
1261 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1262 idev->cnf.use_tempaddr = -1; /*XXX*/
1263 spin_unlock_bh(&ifp->lock);
1264 write_unlock_bh(&idev->lock);
1265 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1266 __func__);
1267 in6_dev_put(idev);
1268 ret = -1;
1269 goto out;
1270 }
1271 in6_ifa_hold(ifp);
1272 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1273 ipv6_try_regen_rndid(idev, tmpaddr);
1274 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1275 age = (now - ifp->tstamp) / HZ;
1276
1277 regen_advance = idev->cnf.regen_max_retry *
1278 idev->cnf.dad_transmits *
1279 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1280
1281 /* recalculate max_desync_factor each time and update
1282 * idev->desync_factor if it's larger
1283 */
1284 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1285 max_desync_factor = min_t(__u32,
1286 idev->cnf.max_desync_factor,
1287 cnf_temp_preferred_lft - regen_advance);
1288
1289 if (unlikely(idev->desync_factor > max_desync_factor)) {
1290 if (max_desync_factor > 0) {
1291 get_random_bytes(&idev->desync_factor,
1292 sizeof(idev->desync_factor));
1293 idev->desync_factor %= max_desync_factor;
1294 } else {
1295 idev->desync_factor = 0;
1296 }
1297 }
1298
1299 tmp_valid_lft = min_t(__u32,
1300 ifp->valid_lft,
1301 idev->cnf.temp_valid_lft + age);
1302 tmp_prefered_lft = cnf_temp_preferred_lft + age -
1303 idev->desync_factor;
1304 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1305 tmp_plen = ifp->prefix_len;
1306 tmp_tstamp = ifp->tstamp;
1307 spin_unlock_bh(&ifp->lock);
1308
1309 write_unlock_bh(&idev->lock);
1310
1311 /* A temporary address is created only if this calculated Preferred
1312 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1313 * an implementation must not create a temporary address with a zero
1314 * Preferred Lifetime.
1315 * Use age calculation as in addrconf_verify to avoid unnecessary
1316 * temporary addresses being generated.
1317 */
1318 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1319 if (tmp_prefered_lft <= regen_advance + age) {
1320 in6_ifa_put(ifp);
1321 in6_dev_put(idev);
1322 ret = -1;
1323 goto out;
1324 }
1325
1326 addr_flags = IFA_F_TEMPORARY;
1327 /* set in addrconf_prefix_rcv() */
1328 if (ifp->flags & IFA_F_OPTIMISTIC)
1329 addr_flags |= IFA_F_OPTIMISTIC;
1330
1331 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1332 ipv6_addr_scope(&addr), addr_flags,
1333 tmp_valid_lft, tmp_prefered_lft);
1334 if (IS_ERR(ift)) {
1335 in6_ifa_put(ifp);
1336 in6_dev_put(idev);
1337 pr_info("%s: retry temporary address regeneration\n", __func__);
1338 tmpaddr = &addr;
1339 write_lock_bh(&idev->lock);
1340 goto retry;
1341 }
1342
1343 spin_lock_bh(&ift->lock);
1344 ift->ifpub = ifp;
1345 ift->cstamp = now;
1346 ift->tstamp = tmp_tstamp;
1347 spin_unlock_bh(&ift->lock);
1348
1349 addrconf_dad_start(ift);
1350 in6_ifa_put(ift);
1351 in6_dev_put(idev);
1352 out:
1353 return ret;
1354 }
1355
1356 /*
1357 * Choose an appropriate source address (RFC3484)
1358 */
1359 enum {
1360 IPV6_SADDR_RULE_INIT = 0,
1361 IPV6_SADDR_RULE_LOCAL,
1362 IPV6_SADDR_RULE_SCOPE,
1363 IPV6_SADDR_RULE_PREFERRED,
1364 #ifdef CONFIG_IPV6_MIP6
1365 IPV6_SADDR_RULE_HOA,
1366 #endif
1367 IPV6_SADDR_RULE_OIF,
1368 IPV6_SADDR_RULE_LABEL,
1369 IPV6_SADDR_RULE_PRIVACY,
1370 IPV6_SADDR_RULE_ORCHID,
1371 IPV6_SADDR_RULE_PREFIX,
1372 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1373 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1374 #endif
1375 IPV6_SADDR_RULE_MAX
1376 };
1377
1378 struct ipv6_saddr_score {
1379 int rule;
1380 int addr_type;
1381 struct inet6_ifaddr *ifa;
1382 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1383 int scopedist;
1384 int matchlen;
1385 };
1386
1387 struct ipv6_saddr_dst {
1388 const struct in6_addr *addr;
1389 int ifindex;
1390 int scope;
1391 int label;
1392 unsigned int prefs;
1393 };
1394
1395 static inline int ipv6_saddr_preferred(int type)
1396 {
1397 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1398 return 1;
1399 return 0;
1400 }
1401
1402 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1403 {
1404 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1405 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1406 #else
1407 return false;
1408 #endif
1409 }
1410
1411 static int ipv6_get_saddr_eval(struct net *net,
1412 struct ipv6_saddr_score *score,
1413 struct ipv6_saddr_dst *dst,
1414 int i)
1415 {
1416 int ret;
1417
1418 if (i <= score->rule) {
1419 switch (i) {
1420 case IPV6_SADDR_RULE_SCOPE:
1421 ret = score->scopedist;
1422 break;
1423 case IPV6_SADDR_RULE_PREFIX:
1424 ret = score->matchlen;
1425 break;
1426 default:
1427 ret = !!test_bit(i, score->scorebits);
1428 }
1429 goto out;
1430 }
1431
1432 switch (i) {
1433 case IPV6_SADDR_RULE_INIT:
1434 /* Rule 0: remember if hiscore is not ready yet */
1435 ret = !!score->ifa;
1436 break;
1437 case IPV6_SADDR_RULE_LOCAL:
1438 /* Rule 1: Prefer same address */
1439 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1440 break;
1441 case IPV6_SADDR_RULE_SCOPE:
1442 /* Rule 2: Prefer appropriate scope
1443 *
1444 * ret
1445 * ^
1446 * -1 | d 15
1447 * ---+--+-+---> scope
1448 * |
1449 * | d is scope of the destination.
1450 * B-d | \
1451 * | \ <- smaller scope is better if
1452 * B-15 | \ if scope is enough for destination.
1453 * | ret = B - scope (-1 <= scope >= d <= 15).
1454 * d-C-1 | /
1455 * |/ <- greater is better
1456 * -C / if scope is not enough for destination.
1457 * /| ret = scope - C (-1 <= d < scope <= 15).
1458 *
1459 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1460 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1461 * Assume B = 0 and we get C > 29.
1462 */
1463 ret = __ipv6_addr_src_scope(score->addr_type);
1464 if (ret >= dst->scope)
1465 ret = -ret;
1466 else
1467 ret -= 128; /* 30 is enough */
1468 score->scopedist = ret;
1469 break;
1470 case IPV6_SADDR_RULE_PREFERRED:
1471 {
1472 /* Rule 3: Avoid deprecated and optimistic addresses */
1473 u8 avoid = IFA_F_DEPRECATED;
1474
1475 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1476 avoid |= IFA_F_OPTIMISTIC;
1477 ret = ipv6_saddr_preferred(score->addr_type) ||
1478 !(score->ifa->flags & avoid);
1479 break;
1480 }
1481 #ifdef CONFIG_IPV6_MIP6
1482 case IPV6_SADDR_RULE_HOA:
1483 {
1484 /* Rule 4: Prefer home address */
1485 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1486 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1487 break;
1488 }
1489 #endif
1490 case IPV6_SADDR_RULE_OIF:
1491 /* Rule 5: Prefer outgoing interface */
1492 ret = (!dst->ifindex ||
1493 dst->ifindex == score->ifa->idev->dev->ifindex);
1494 break;
1495 case IPV6_SADDR_RULE_LABEL:
1496 /* Rule 6: Prefer matching label */
1497 ret = ipv6_addr_label(net,
1498 &score->ifa->addr, score->addr_type,
1499 score->ifa->idev->dev->ifindex) == dst->label;
1500 break;
1501 case IPV6_SADDR_RULE_PRIVACY:
1502 {
1503 /* Rule 7: Prefer public address
1504 * Note: prefer temporary address if use_tempaddr >= 2
1505 */
1506 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1507 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1508 score->ifa->idev->cnf.use_tempaddr >= 2;
1509 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1510 break;
1511 }
1512 case IPV6_SADDR_RULE_ORCHID:
1513 /* Rule 8-: Prefer ORCHID vs ORCHID or
1514 * non-ORCHID vs non-ORCHID
1515 */
1516 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1517 ipv6_addr_orchid(dst->addr));
1518 break;
1519 case IPV6_SADDR_RULE_PREFIX:
1520 /* Rule 8: Use longest matching prefix */
1521 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1522 if (ret > score->ifa->prefix_len)
1523 ret = score->ifa->prefix_len;
1524 score->matchlen = ret;
1525 break;
1526 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1527 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1528 /* Optimistic addresses still have lower precedence than other
1529 * preferred addresses.
1530 */
1531 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1532 break;
1533 #endif
1534 default:
1535 ret = 0;
1536 }
1537
1538 if (ret)
1539 __set_bit(i, score->scorebits);
1540 score->rule = i;
1541 out:
1542 return ret;
1543 }
1544
1545 static int __ipv6_dev_get_saddr(struct net *net,
1546 struct ipv6_saddr_dst *dst,
1547 struct inet6_dev *idev,
1548 struct ipv6_saddr_score *scores,
1549 int hiscore_idx)
1550 {
1551 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1552
1553 read_lock_bh(&idev->lock);
1554 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1555 int i;
1556
1557 /*
1558 * - Tentative Address (RFC2462 section 5.4)
1559 * - A tentative address is not considered
1560 * "assigned to an interface" in the traditional
1561 * sense, unless it is also flagged as optimistic.
1562 * - Candidate Source Address (section 4)
1563 * - In any case, anycast addresses, multicast
1564 * addresses, and the unspecified address MUST
1565 * NOT be included in a candidate set.
1566 */
1567 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1568 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1569 continue;
1570
1571 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1572
1573 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1574 score->addr_type & IPV6_ADDR_MULTICAST)) {
1575 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1576 idev->dev->name);
1577 continue;
1578 }
1579
1580 score->rule = -1;
1581 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1582
1583 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1584 int minihiscore, miniscore;
1585
1586 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1587 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1588
1589 if (minihiscore > miniscore) {
1590 if (i == IPV6_SADDR_RULE_SCOPE &&
1591 score->scopedist > 0) {
1592 /*
1593 * special case:
1594 * each remaining entry
1595 * has too small (not enough)
1596 * scope, because ifa entries
1597 * are sorted by their scope
1598 * values.
1599 */
1600 goto out;
1601 }
1602 break;
1603 } else if (minihiscore < miniscore) {
1604 if (hiscore->ifa)
1605 in6_ifa_put(hiscore->ifa);
1606
1607 in6_ifa_hold(score->ifa);
1608
1609 swap(hiscore, score);
1610 hiscore_idx = 1 - hiscore_idx;
1611
1612 /* restore our iterator */
1613 score->ifa = hiscore->ifa;
1614
1615 break;
1616 }
1617 }
1618 }
1619 out:
1620 read_unlock_bh(&idev->lock);
1621 return hiscore_idx;
1622 }
1623
1624 static int ipv6_get_saddr_master(struct net *net,
1625 const struct net_device *dst_dev,
1626 const struct net_device *master,
1627 struct ipv6_saddr_dst *dst,
1628 struct ipv6_saddr_score *scores,
1629 int hiscore_idx)
1630 {
1631 struct inet6_dev *idev;
1632
1633 idev = __in6_dev_get(dst_dev);
1634 if (idev)
1635 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1636 scores, hiscore_idx);
1637
1638 idev = __in6_dev_get(master);
1639 if (idev)
1640 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1641 scores, hiscore_idx);
1642
1643 return hiscore_idx;
1644 }
1645
1646 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1647 const struct in6_addr *daddr, unsigned int prefs,
1648 struct in6_addr *saddr)
1649 {
1650 struct ipv6_saddr_score scores[2], *hiscore;
1651 struct ipv6_saddr_dst dst;
1652 struct inet6_dev *idev;
1653 struct net_device *dev;
1654 int dst_type;
1655 bool use_oif_addr = false;
1656 int hiscore_idx = 0;
1657
1658 dst_type = __ipv6_addr_type(daddr);
1659 dst.addr = daddr;
1660 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1661 dst.scope = __ipv6_addr_src_scope(dst_type);
1662 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1663 dst.prefs = prefs;
1664
1665 scores[hiscore_idx].rule = -1;
1666 scores[hiscore_idx].ifa = NULL;
1667
1668 rcu_read_lock();
1669
1670 /* Candidate Source Address (section 4)
1671 * - multicast and link-local destination address,
1672 * the set of candidate source address MUST only
1673 * include addresses assigned to interfaces
1674 * belonging to the same link as the outgoing
1675 * interface.
1676 * (- For site-local destination addresses, the
1677 * set of candidate source addresses MUST only
1678 * include addresses assigned to interfaces
1679 * belonging to the same site as the outgoing
1680 * interface.)
1681 * - "It is RECOMMENDED that the candidate source addresses
1682 * be the set of unicast addresses assigned to the
1683 * interface that will be used to send to the destination
1684 * (the 'outgoing' interface)." (RFC 6724)
1685 */
1686 if (dst_dev) {
1687 idev = __in6_dev_get(dst_dev);
1688 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1689 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1690 (idev && idev->cnf.use_oif_addrs_only)) {
1691 use_oif_addr = true;
1692 }
1693 }
1694
1695 if (use_oif_addr) {
1696 if (idev)
1697 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1698 } else {
1699 const struct net_device *master;
1700 int master_idx = 0;
1701
1702 /* if dst_dev exists and is enslaved to an L3 device, then
1703 * prefer addresses from dst_dev and then the master over
1704 * any other enslaved devices in the L3 domain.
1705 */
1706 master = l3mdev_master_dev_rcu(dst_dev);
1707 if (master) {
1708 master_idx = master->ifindex;
1709
1710 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1711 master, &dst,
1712 scores, hiscore_idx);
1713
1714 if (scores[hiscore_idx].ifa)
1715 goto out;
1716 }
1717
1718 for_each_netdev_rcu(net, dev) {
1719 /* only consider addresses on devices in the
1720 * same L3 domain
1721 */
1722 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1723 continue;
1724 idev = __in6_dev_get(dev);
1725 if (!idev)
1726 continue;
1727 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1728 }
1729 }
1730
1731 out:
1732 rcu_read_unlock();
1733
1734 hiscore = &scores[hiscore_idx];
1735 if (!hiscore->ifa)
1736 return -EADDRNOTAVAIL;
1737
1738 *saddr = hiscore->ifa->addr;
1739 in6_ifa_put(hiscore->ifa);
1740 return 0;
1741 }
1742 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1743
1744 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1745 u32 banned_flags)
1746 {
1747 struct inet6_ifaddr *ifp;
1748 int err = -EADDRNOTAVAIL;
1749
1750 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1751 if (ifp->scope > IFA_LINK)
1752 break;
1753 if (ifp->scope == IFA_LINK &&
1754 !(ifp->flags & banned_flags)) {
1755 *addr = ifp->addr;
1756 err = 0;
1757 break;
1758 }
1759 }
1760 return err;
1761 }
1762
1763 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1764 u32 banned_flags)
1765 {
1766 struct inet6_dev *idev;
1767 int err = -EADDRNOTAVAIL;
1768
1769 rcu_read_lock();
1770 idev = __in6_dev_get(dev);
1771 if (idev) {
1772 read_lock_bh(&idev->lock);
1773 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1774 read_unlock_bh(&idev->lock);
1775 }
1776 rcu_read_unlock();
1777 return err;
1778 }
1779
1780 static int ipv6_count_addresses(struct inet6_dev *idev)
1781 {
1782 int cnt = 0;
1783 struct inet6_ifaddr *ifp;
1784
1785 read_lock_bh(&idev->lock);
1786 list_for_each_entry(ifp, &idev->addr_list, if_list)
1787 cnt++;
1788 read_unlock_bh(&idev->lock);
1789 return cnt;
1790 }
1791
1792 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1793 const struct net_device *dev, int strict)
1794 {
1795 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1796 }
1797 EXPORT_SYMBOL(ipv6_chk_addr);
1798
1799 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1800 const struct net_device *dev, int strict,
1801 u32 banned_flags)
1802 {
1803 struct inet6_ifaddr *ifp;
1804 unsigned int hash = inet6_addr_hash(addr);
1805 u32 ifp_flags;
1806
1807 rcu_read_lock_bh();
1808 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1809 if (!net_eq(dev_net(ifp->idev->dev), net))
1810 continue;
1811 /* Decouple optimistic from tentative for evaluation here.
1812 * Ban optimistic addresses explicitly, when required.
1813 */
1814 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1815 ? (ifp->flags&~IFA_F_TENTATIVE)
1816 : ifp->flags;
1817 if (ipv6_addr_equal(&ifp->addr, addr) &&
1818 !(ifp_flags&banned_flags) &&
1819 (!dev || ifp->idev->dev == dev ||
1820 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1821 rcu_read_unlock_bh();
1822 return 1;
1823 }
1824 }
1825
1826 rcu_read_unlock_bh();
1827 return 0;
1828 }
1829 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1830
1831 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1832 struct net_device *dev)
1833 {
1834 unsigned int hash = inet6_addr_hash(addr);
1835 struct inet6_ifaddr *ifp;
1836
1837 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1838 if (!net_eq(dev_net(ifp->idev->dev), net))
1839 continue;
1840 if (ipv6_addr_equal(&ifp->addr, addr)) {
1841 if (!dev || ifp->idev->dev == dev)
1842 return true;
1843 }
1844 }
1845 return false;
1846 }
1847
1848 /* Compares an address/prefix_len with addresses on device @dev.
1849 * If one is found it returns true.
1850 */
1851 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1852 const unsigned int prefix_len, struct net_device *dev)
1853 {
1854 struct inet6_dev *idev;
1855 struct inet6_ifaddr *ifa;
1856 bool ret = false;
1857
1858 rcu_read_lock();
1859 idev = __in6_dev_get(dev);
1860 if (idev) {
1861 read_lock_bh(&idev->lock);
1862 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1863 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1864 if (ret)
1865 break;
1866 }
1867 read_unlock_bh(&idev->lock);
1868 }
1869 rcu_read_unlock();
1870
1871 return ret;
1872 }
1873 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1874
1875 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1876 {
1877 struct inet6_dev *idev;
1878 struct inet6_ifaddr *ifa;
1879 int onlink;
1880
1881 onlink = 0;
1882 rcu_read_lock();
1883 idev = __in6_dev_get(dev);
1884 if (idev) {
1885 read_lock_bh(&idev->lock);
1886 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1887 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1888 ifa->prefix_len);
1889 if (onlink)
1890 break;
1891 }
1892 read_unlock_bh(&idev->lock);
1893 }
1894 rcu_read_unlock();
1895 return onlink;
1896 }
1897 EXPORT_SYMBOL(ipv6_chk_prefix);
1898
1899 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1900 struct net_device *dev, int strict)
1901 {
1902 struct inet6_ifaddr *ifp, *result = NULL;
1903 unsigned int hash = inet6_addr_hash(addr);
1904
1905 rcu_read_lock_bh();
1906 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1907 if (!net_eq(dev_net(ifp->idev->dev), net))
1908 continue;
1909 if (ipv6_addr_equal(&ifp->addr, addr)) {
1910 if (!dev || ifp->idev->dev == dev ||
1911 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1912 result = ifp;
1913 in6_ifa_hold(ifp);
1914 break;
1915 }
1916 }
1917 }
1918 rcu_read_unlock_bh();
1919
1920 return result;
1921 }
1922
1923 /* Gets referenced address, destroys ifaddr */
1924
1925 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1926 {
1927 if (dad_failed)
1928 ifp->flags |= IFA_F_DADFAILED;
1929
1930 if (ifp->flags&IFA_F_TEMPORARY) {
1931 struct inet6_ifaddr *ifpub;
1932 spin_lock_bh(&ifp->lock);
1933 ifpub = ifp->ifpub;
1934 if (ifpub) {
1935 in6_ifa_hold(ifpub);
1936 spin_unlock_bh(&ifp->lock);
1937 ipv6_create_tempaddr(ifpub, ifp);
1938 in6_ifa_put(ifpub);
1939 } else {
1940 spin_unlock_bh(&ifp->lock);
1941 }
1942 ipv6_del_addr(ifp);
1943 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1944 spin_lock_bh(&ifp->lock);
1945 addrconf_del_dad_work(ifp);
1946 ifp->flags |= IFA_F_TENTATIVE;
1947 spin_unlock_bh(&ifp->lock);
1948 if (dad_failed)
1949 ipv6_ifa_notify(0, ifp);
1950 in6_ifa_put(ifp);
1951 } else {
1952 ipv6_del_addr(ifp);
1953 }
1954 }
1955
1956 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1957 {
1958 int err = -ENOENT;
1959
1960 spin_lock_bh(&ifp->lock);
1961 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1962 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1963 err = 0;
1964 }
1965 spin_unlock_bh(&ifp->lock);
1966
1967 return err;
1968 }
1969
1970 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1971 {
1972 struct inet6_dev *idev = ifp->idev;
1973 struct net *net = dev_net(ifp->idev->dev);
1974
1975 if (addrconf_dad_end(ifp)) {
1976 in6_ifa_put(ifp);
1977 return;
1978 }
1979
1980 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1981 ifp->idev->dev->name, &ifp->addr);
1982
1983 spin_lock_bh(&ifp->lock);
1984
1985 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1986 int scope = ifp->scope;
1987 u32 flags = ifp->flags;
1988 struct in6_addr new_addr;
1989 struct inet6_ifaddr *ifp2;
1990 u32 valid_lft, preferred_lft;
1991 int pfxlen = ifp->prefix_len;
1992 int retries = ifp->stable_privacy_retry + 1;
1993
1994 if (retries > net->ipv6.sysctl.idgen_retries) {
1995 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1996 ifp->idev->dev->name);
1997 goto errdad;
1998 }
1999
2000 new_addr = ifp->addr;
2001 if (ipv6_generate_stable_address(&new_addr, retries,
2002 idev))
2003 goto errdad;
2004
2005 valid_lft = ifp->valid_lft;
2006 preferred_lft = ifp->prefered_lft;
2007
2008 spin_unlock_bh(&ifp->lock);
2009
2010 if (idev->cnf.max_addresses &&
2011 ipv6_count_addresses(idev) >=
2012 idev->cnf.max_addresses)
2013 goto lock_errdad;
2014
2015 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2016 ifp->idev->dev->name);
2017
2018 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2019 scope, flags, valid_lft,
2020 preferred_lft);
2021 if (IS_ERR(ifp2))
2022 goto lock_errdad;
2023
2024 spin_lock_bh(&ifp2->lock);
2025 ifp2->stable_privacy_retry = retries;
2026 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2027 spin_unlock_bh(&ifp2->lock);
2028
2029 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2030 in6_ifa_put(ifp2);
2031 lock_errdad:
2032 spin_lock_bh(&ifp->lock);
2033 }
2034
2035 errdad:
2036 /* transition from _POSTDAD to _ERRDAD */
2037 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2038 spin_unlock_bh(&ifp->lock);
2039
2040 addrconf_mod_dad_work(ifp, 0);
2041 in6_ifa_put(ifp);
2042 }
2043
2044 /* Join to solicited addr multicast group.
2045 * caller must hold RTNL */
2046 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2047 {
2048 struct in6_addr maddr;
2049
2050 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2051 return;
2052
2053 addrconf_addr_solict_mult(addr, &maddr);
2054 ipv6_dev_mc_inc(dev, &maddr);
2055 }
2056
2057 /* caller must hold RTNL */
2058 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2059 {
2060 struct in6_addr maddr;
2061
2062 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2063 return;
2064
2065 addrconf_addr_solict_mult(addr, &maddr);
2066 __ipv6_dev_mc_dec(idev, &maddr);
2067 }
2068
2069 /* caller must hold RTNL */
2070 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2071 {
2072 struct in6_addr addr;
2073
2074 if (ifp->prefix_len >= 127) /* RFC 6164 */
2075 return;
2076 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2077 if (ipv6_addr_any(&addr))
2078 return;
2079 __ipv6_dev_ac_inc(ifp->idev, &addr);
2080 }
2081
2082 /* caller must hold RTNL */
2083 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2084 {
2085 struct in6_addr addr;
2086
2087 if (ifp->prefix_len >= 127) /* RFC 6164 */
2088 return;
2089 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2090 if (ipv6_addr_any(&addr))
2091 return;
2092 __ipv6_dev_ac_dec(ifp->idev, &addr);
2093 }
2094
2095 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2096 {
2097 switch (dev->addr_len) {
2098 case ETH_ALEN:
2099 memcpy(eui, dev->dev_addr, 3);
2100 eui[3] = 0xFF;
2101 eui[4] = 0xFE;
2102 memcpy(eui + 5, dev->dev_addr + 3, 3);
2103 break;
2104 case EUI64_ADDR_LEN:
2105 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2106 eui[0] ^= 2;
2107 break;
2108 default:
2109 return -1;
2110 }
2111
2112 return 0;
2113 }
2114
2115 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2116 {
2117 union fwnet_hwaddr *ha;
2118
2119 if (dev->addr_len != FWNET_ALEN)
2120 return -1;
2121
2122 ha = (union fwnet_hwaddr *)dev->dev_addr;
2123
2124 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2125 eui[0] ^= 2;
2126 return 0;
2127 }
2128
2129 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2130 {
2131 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2132 if (dev->addr_len != ARCNET_ALEN)
2133 return -1;
2134 memset(eui, 0, 7);
2135 eui[7] = *(u8 *)dev->dev_addr;
2136 return 0;
2137 }
2138
2139 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2140 {
2141 if (dev->addr_len != INFINIBAND_ALEN)
2142 return -1;
2143 memcpy(eui, dev->dev_addr + 12, 8);
2144 eui[0] |= 2;
2145 return 0;
2146 }
2147
2148 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2149 {
2150 if (addr == 0)
2151 return -1;
2152 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2153 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2154 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2155 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2156 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2157 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2158 eui[1] = 0;
2159 eui[2] = 0x5E;
2160 eui[3] = 0xFE;
2161 memcpy(eui + 4, &addr, 4);
2162 return 0;
2163 }
2164
2165 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2166 {
2167 if (dev->priv_flags & IFF_ISATAP)
2168 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2169 return -1;
2170 }
2171
2172 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2173 {
2174 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2175 }
2176
2177 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2178 {
2179 memcpy(eui, dev->perm_addr, 3);
2180 memcpy(eui + 5, dev->perm_addr + 3, 3);
2181 eui[3] = 0xFF;
2182 eui[4] = 0xFE;
2183 eui[0] ^= 2;
2184 return 0;
2185 }
2186
2187 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2188 {
2189 switch (dev->type) {
2190 case ARPHRD_ETHER:
2191 case ARPHRD_FDDI:
2192 return addrconf_ifid_eui48(eui, dev);
2193 case ARPHRD_ARCNET:
2194 return addrconf_ifid_arcnet(eui, dev);
2195 case ARPHRD_INFINIBAND:
2196 return addrconf_ifid_infiniband(eui, dev);
2197 case ARPHRD_SIT:
2198 return addrconf_ifid_sit(eui, dev);
2199 case ARPHRD_IPGRE:
2200 case ARPHRD_TUNNEL:
2201 return addrconf_ifid_gre(eui, dev);
2202 case ARPHRD_6LOWPAN:
2203 return addrconf_ifid_6lowpan(eui, dev);
2204 case ARPHRD_IEEE1394:
2205 return addrconf_ifid_ieee1394(eui, dev);
2206 case ARPHRD_TUNNEL6:
2207 case ARPHRD_IP6GRE:
2208 return addrconf_ifid_ip6tnl(eui, dev);
2209 }
2210 return -1;
2211 }
2212
2213 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2214 {
2215 int err = -1;
2216 struct inet6_ifaddr *ifp;
2217
2218 read_lock_bh(&idev->lock);
2219 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2220 if (ifp->scope > IFA_LINK)
2221 break;
2222 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2223 memcpy(eui, ifp->addr.s6_addr+8, 8);
2224 err = 0;
2225 break;
2226 }
2227 }
2228 read_unlock_bh(&idev->lock);
2229 return err;
2230 }
2231
2232 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2233 static void ipv6_regen_rndid(struct inet6_dev *idev)
2234 {
2235 regen:
2236 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2237 idev->rndid[0] &= ~0x02;
2238
2239 /*
2240 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2241 * check if generated address is not inappropriate
2242 *
2243 * - Reserved subnet anycast (RFC 2526)
2244 * 11111101 11....11 1xxxxxxx
2245 * - ISATAP (RFC4214) 6.1
2246 * 00-00-5E-FE-xx-xx-xx-xx
2247 * - value 0
2248 * - XXX: already assigned to an address on the device
2249 */
2250 if (idev->rndid[0] == 0xfd &&
2251 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2252 (idev->rndid[7]&0x80))
2253 goto regen;
2254 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2255 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2256 goto regen;
2257 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2258 goto regen;
2259 }
2260 }
2261
2262 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2263 {
2264 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2265 ipv6_regen_rndid(idev);
2266 }
2267
2268 /*
2269 * Add prefix route.
2270 */
2271
2272 static void
2273 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2274 unsigned long expires, u32 flags)
2275 {
2276 struct fib6_config cfg = {
2277 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2278 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2279 .fc_ifindex = dev->ifindex,
2280 .fc_expires = expires,
2281 .fc_dst_len = plen,
2282 .fc_flags = RTF_UP | flags,
2283 .fc_nlinfo.nl_net = dev_net(dev),
2284 .fc_protocol = RTPROT_KERNEL,
2285 };
2286
2287 cfg.fc_dst = *pfx;
2288
2289 /* Prevent useless cloning on PtP SIT.
2290 This thing is done here expecting that the whole
2291 class of non-broadcast devices need not cloning.
2292 */
2293 #if IS_ENABLED(CONFIG_IPV6_SIT)
2294 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2295 cfg.fc_flags |= RTF_NONEXTHOP;
2296 #endif
2297
2298 ip6_route_add(&cfg, NULL);
2299 }
2300
2301
2302 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2303 int plen,
2304 const struct net_device *dev,
2305 u32 flags, u32 noflags)
2306 {
2307 struct fib6_node *fn;
2308 struct rt6_info *rt = NULL;
2309 struct fib6_table *table;
2310 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2311
2312 table = fib6_get_table(dev_net(dev), tb_id);
2313 if (!table)
2314 return NULL;
2315
2316 read_lock_bh(&table->tb6_lock);
2317 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2318 if (!fn)
2319 goto out;
2320
2321 noflags |= RTF_CACHE;
2322 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2323 if (rt->dst.dev->ifindex != dev->ifindex)
2324 continue;
2325 if ((rt->rt6i_flags & flags) != flags)
2326 continue;
2327 if ((rt->rt6i_flags & noflags) != 0)
2328 continue;
2329 dst_hold(&rt->dst);
2330 break;
2331 }
2332 out:
2333 read_unlock_bh(&table->tb6_lock);
2334 return rt;
2335 }
2336
2337
2338 /* Create "default" multicast route to the interface */
2339
2340 static void addrconf_add_mroute(struct net_device *dev)
2341 {
2342 struct fib6_config cfg = {
2343 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2344 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2345 .fc_ifindex = dev->ifindex,
2346 .fc_dst_len = 8,
2347 .fc_flags = RTF_UP,
2348 .fc_nlinfo.nl_net = dev_net(dev),
2349 };
2350
2351 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2352
2353 ip6_route_add(&cfg, NULL);
2354 }
2355
2356 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2357 {
2358 struct inet6_dev *idev;
2359
2360 ASSERT_RTNL();
2361
2362 idev = ipv6_find_idev(dev);
2363 if (!idev)
2364 return ERR_PTR(-ENOBUFS);
2365
2366 if (idev->cnf.disable_ipv6)
2367 return ERR_PTR(-EACCES);
2368
2369 /* Add default multicast route */
2370 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2371 addrconf_add_mroute(dev);
2372
2373 return idev;
2374 }
2375
2376 static void manage_tempaddrs(struct inet6_dev *idev,
2377 struct inet6_ifaddr *ifp,
2378 __u32 valid_lft, __u32 prefered_lft,
2379 bool create, unsigned long now)
2380 {
2381 u32 flags;
2382 struct inet6_ifaddr *ift;
2383
2384 read_lock_bh(&idev->lock);
2385 /* update all temporary addresses in the list */
2386 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2387 int age, max_valid, max_prefered;
2388
2389 if (ifp != ift->ifpub)
2390 continue;
2391
2392 /* RFC 4941 section 3.3:
2393 * If a received option will extend the lifetime of a public
2394 * address, the lifetimes of temporary addresses should
2395 * be extended, subject to the overall constraint that no
2396 * temporary addresses should ever remain "valid" or "preferred"
2397 * for a time longer than (TEMP_VALID_LIFETIME) or
2398 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2399 */
2400 age = (now - ift->cstamp) / HZ;
2401 max_valid = idev->cnf.temp_valid_lft - age;
2402 if (max_valid < 0)
2403 max_valid = 0;
2404
2405 max_prefered = idev->cnf.temp_prefered_lft -
2406 idev->desync_factor - age;
2407 if (max_prefered < 0)
2408 max_prefered = 0;
2409
2410 if (valid_lft > max_valid)
2411 valid_lft = max_valid;
2412
2413 if (prefered_lft > max_prefered)
2414 prefered_lft = max_prefered;
2415
2416 spin_lock(&ift->lock);
2417 flags = ift->flags;
2418 ift->valid_lft = valid_lft;
2419 ift->prefered_lft = prefered_lft;
2420 ift->tstamp = now;
2421 if (prefered_lft > 0)
2422 ift->flags &= ~IFA_F_DEPRECATED;
2423
2424 spin_unlock(&ift->lock);
2425 if (!(flags&IFA_F_TENTATIVE))
2426 ipv6_ifa_notify(0, ift);
2427 }
2428
2429 if ((create || list_empty(&idev->tempaddr_list)) &&
2430 idev->cnf.use_tempaddr > 0) {
2431 /* When a new public address is created as described
2432 * in [ADDRCONF], also create a new temporary address.
2433 * Also create a temporary address if it's enabled but
2434 * no temporary address currently exists.
2435 */
2436 read_unlock_bh(&idev->lock);
2437 ipv6_create_tempaddr(ifp, NULL);
2438 } else {
2439 read_unlock_bh(&idev->lock);
2440 }
2441 }
2442
2443 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2444 {
2445 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2446 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2447 }
2448
2449 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2450 const struct prefix_info *pinfo,
2451 struct inet6_dev *in6_dev,
2452 const struct in6_addr *addr, int addr_type,
2453 u32 addr_flags, bool sllao, bool tokenized,
2454 __u32 valid_lft, u32 prefered_lft)
2455 {
2456 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2457 int create = 0, update_lft = 0;
2458
2459 if (!ifp && valid_lft) {
2460 int max_addresses = in6_dev->cnf.max_addresses;
2461
2462 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2463 if (in6_dev->cnf.optimistic_dad &&
2464 !net->ipv6.devconf_all->forwarding && sllao)
2465 addr_flags |= IFA_F_OPTIMISTIC;
2466 #endif
2467
2468 /* Do not allow to create too much of autoconfigured
2469 * addresses; this would be too easy way to crash kernel.
2470 */
2471 if (!max_addresses ||
2472 ipv6_count_addresses(in6_dev) < max_addresses)
2473 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2474 pinfo->prefix_len,
2475 addr_type&IPV6_ADDR_SCOPE_MASK,
2476 addr_flags, valid_lft,
2477 prefered_lft);
2478
2479 if (IS_ERR_OR_NULL(ifp))
2480 return -1;
2481
2482 update_lft = 0;
2483 create = 1;
2484 spin_lock_bh(&ifp->lock);
2485 ifp->flags |= IFA_F_MANAGETEMPADDR;
2486 ifp->cstamp = jiffies;
2487 ifp->tokenized = tokenized;
2488 spin_unlock_bh(&ifp->lock);
2489 addrconf_dad_start(ifp);
2490 }
2491
2492 if (ifp) {
2493 u32 flags;
2494 unsigned long now;
2495 u32 stored_lft;
2496
2497 /* update lifetime (RFC2462 5.5.3 e) */
2498 spin_lock_bh(&ifp->lock);
2499 now = jiffies;
2500 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2501 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2502 else
2503 stored_lft = 0;
2504 if (!update_lft && !create && stored_lft) {
2505 const u32 minimum_lft = min_t(u32,
2506 stored_lft, MIN_VALID_LIFETIME);
2507 valid_lft = max(valid_lft, minimum_lft);
2508
2509 /* RFC4862 Section 5.5.3e:
2510 * "Note that the preferred lifetime of the
2511 * corresponding address is always reset to
2512 * the Preferred Lifetime in the received
2513 * Prefix Information option, regardless of
2514 * whether the valid lifetime is also reset or
2515 * ignored."
2516 *
2517 * So we should always update prefered_lft here.
2518 */
2519 update_lft = 1;
2520 }
2521
2522 if (update_lft) {
2523 ifp->valid_lft = valid_lft;
2524 ifp->prefered_lft = prefered_lft;
2525 ifp->tstamp = now;
2526 flags = ifp->flags;
2527 ifp->flags &= ~IFA_F_DEPRECATED;
2528 spin_unlock_bh(&ifp->lock);
2529
2530 if (!(flags&IFA_F_TENTATIVE))
2531 ipv6_ifa_notify(0, ifp);
2532 } else
2533 spin_unlock_bh(&ifp->lock);
2534
2535 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2536 create, now);
2537
2538 in6_ifa_put(ifp);
2539 addrconf_verify();
2540 }
2541
2542 return 0;
2543 }
2544 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2545
2546 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2547 {
2548 struct prefix_info *pinfo;
2549 __u32 valid_lft;
2550 __u32 prefered_lft;
2551 int addr_type, err;
2552 u32 addr_flags = 0;
2553 struct inet6_dev *in6_dev;
2554 struct net *net = dev_net(dev);
2555
2556 pinfo = (struct prefix_info *) opt;
2557
2558 if (len < sizeof(struct prefix_info)) {
2559 ADBG("addrconf: prefix option too short\n");
2560 return;
2561 }
2562
2563 /*
2564 * Validation checks ([ADDRCONF], page 19)
2565 */
2566
2567 addr_type = ipv6_addr_type(&pinfo->prefix);
2568
2569 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2570 return;
2571
2572 valid_lft = ntohl(pinfo->valid);
2573 prefered_lft = ntohl(pinfo->prefered);
2574
2575 if (prefered_lft > valid_lft) {
2576 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2577 return;
2578 }
2579
2580 in6_dev = in6_dev_get(dev);
2581
2582 if (!in6_dev) {
2583 net_dbg_ratelimited("addrconf: device %s not configured\n",
2584 dev->name);
2585 return;
2586 }
2587
2588 /*
2589 * Two things going on here:
2590 * 1) Add routes for on-link prefixes
2591 * 2) Configure prefixes with the auto flag set
2592 */
2593
2594 if (pinfo->onlink) {
2595 struct rt6_info *rt;
2596 unsigned long rt_expires;
2597
2598 /* Avoid arithmetic overflow. Really, we could
2599 * save rt_expires in seconds, likely valid_lft,
2600 * but it would require division in fib gc, that it
2601 * not good.
2602 */
2603 if (HZ > USER_HZ)
2604 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2605 else
2606 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2607
2608 if (addrconf_finite_timeout(rt_expires))
2609 rt_expires *= HZ;
2610
2611 rt = addrconf_get_prefix_route(&pinfo->prefix,
2612 pinfo->prefix_len,
2613 dev,
2614 RTF_ADDRCONF | RTF_PREFIX_RT,
2615 RTF_GATEWAY | RTF_DEFAULT);
2616
2617 if (rt) {
2618 /* Autoconf prefix route */
2619 if (valid_lft == 0) {
2620 ip6_del_rt(rt);
2621 rt = NULL;
2622 } else if (addrconf_finite_timeout(rt_expires)) {
2623 /* not infinity */
2624 rt6_set_expires(rt, jiffies + rt_expires);
2625 } else {
2626 rt6_clean_expires(rt);
2627 }
2628 } else if (valid_lft) {
2629 clock_t expires = 0;
2630 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2631 if (addrconf_finite_timeout(rt_expires)) {
2632 /* not infinity */
2633 flags |= RTF_EXPIRES;
2634 expires = jiffies_to_clock_t(rt_expires);
2635 }
2636 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2637 dev, expires, flags);
2638 }
2639 ip6_rt_put(rt);
2640 }
2641
2642 /* Try to figure out our local address for this prefix */
2643
2644 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2645 struct in6_addr addr;
2646 bool tokenized = false, dev_addr_generated = false;
2647
2648 if (pinfo->prefix_len == 64) {
2649 memcpy(&addr, &pinfo->prefix, 8);
2650
2651 if (!ipv6_addr_any(&in6_dev->token)) {
2652 read_lock_bh(&in6_dev->lock);
2653 memcpy(addr.s6_addr + 8,
2654 in6_dev->token.s6_addr + 8, 8);
2655 read_unlock_bh(&in6_dev->lock);
2656 tokenized = true;
2657 } else if (is_addr_mode_generate_stable(in6_dev) &&
2658 !ipv6_generate_stable_address(&addr, 0,
2659 in6_dev)) {
2660 addr_flags |= IFA_F_STABLE_PRIVACY;
2661 goto ok;
2662 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2663 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2664 goto put;
2665 } else {
2666 dev_addr_generated = true;
2667 }
2668 goto ok;
2669 }
2670 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2671 pinfo->prefix_len);
2672 goto put;
2673
2674 ok:
2675 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2676 &addr, addr_type,
2677 addr_flags, sllao,
2678 tokenized, valid_lft,
2679 prefered_lft);
2680 if (err)
2681 goto put;
2682
2683 /* Ignore error case here because previous prefix add addr was
2684 * successful which will be notified.
2685 */
2686 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2687 addr_type, addr_flags, sllao,
2688 tokenized, valid_lft,
2689 prefered_lft,
2690 dev_addr_generated);
2691 }
2692 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2693 put:
2694 in6_dev_put(in6_dev);
2695 }
2696
2697 /*
2698 * Set destination address.
2699 * Special case for SIT interfaces where we create a new "virtual"
2700 * device.
2701 */
2702 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2703 {
2704 struct in6_ifreq ireq;
2705 struct net_device *dev;
2706 int err = -EINVAL;
2707
2708 rtnl_lock();
2709
2710 err = -EFAULT;
2711 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2712 goto err_exit;
2713
2714 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2715
2716 err = -ENODEV;
2717 if (!dev)
2718 goto err_exit;
2719
2720 #if IS_ENABLED(CONFIG_IPV6_SIT)
2721 if (dev->type == ARPHRD_SIT) {
2722 const struct net_device_ops *ops = dev->netdev_ops;
2723 struct ifreq ifr;
2724 struct ip_tunnel_parm p;
2725
2726 err = -EADDRNOTAVAIL;
2727 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2728 goto err_exit;
2729
2730 memset(&p, 0, sizeof(p));
2731 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2732 p.iph.saddr = 0;
2733 p.iph.version = 4;
2734 p.iph.ihl = 5;
2735 p.iph.protocol = IPPROTO_IPV6;
2736 p.iph.ttl = 64;
2737 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2738
2739 if (ops->ndo_do_ioctl) {
2740 mm_segment_t oldfs = get_fs();
2741
2742 set_fs(KERNEL_DS);
2743 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2744 set_fs(oldfs);
2745 } else
2746 err = -EOPNOTSUPP;
2747
2748 if (err == 0) {
2749 err = -ENOBUFS;
2750 dev = __dev_get_by_name(net, p.name);
2751 if (!dev)
2752 goto err_exit;
2753 err = dev_open(dev);
2754 }
2755 }
2756 #endif
2757
2758 err_exit:
2759 rtnl_unlock();
2760 return err;
2761 }
2762
2763 static int ipv6_mc_config(struct sock *sk, bool join,
2764 const struct in6_addr *addr, int ifindex)
2765 {
2766 int ret;
2767
2768 ASSERT_RTNL();
2769
2770 lock_sock(sk);
2771 if (join)
2772 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2773 else
2774 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2775 release_sock(sk);
2776
2777 return ret;
2778 }
2779
2780 /*
2781 * Manual configuration of address on an interface
2782 */
2783 static int inet6_addr_add(struct net *net, int ifindex,
2784 const struct in6_addr *pfx,
2785 const struct in6_addr *peer_pfx,
2786 unsigned int plen, __u32 ifa_flags,
2787 __u32 prefered_lft, __u32 valid_lft)
2788 {
2789 struct inet6_ifaddr *ifp;
2790 struct inet6_dev *idev;
2791 struct net_device *dev;
2792 unsigned long timeout;
2793 clock_t expires;
2794 int scope;
2795 u32 flags;
2796
2797 ASSERT_RTNL();
2798
2799 if (plen > 128)
2800 return -EINVAL;
2801
2802 /* check the lifetime */
2803 if (!valid_lft || prefered_lft > valid_lft)
2804 return -EINVAL;
2805
2806 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2807 return -EINVAL;
2808
2809 dev = __dev_get_by_index(net, ifindex);
2810 if (!dev)
2811 return -ENODEV;
2812
2813 idev = addrconf_add_dev(dev);
2814 if (IS_ERR(idev))
2815 return PTR_ERR(idev);
2816
2817 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2818 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2819 true, pfx, ifindex);
2820
2821 if (ret < 0)
2822 return ret;
2823 }
2824
2825 scope = ipv6_addr_scope(pfx);
2826
2827 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2828 if (addrconf_finite_timeout(timeout)) {
2829 expires = jiffies_to_clock_t(timeout * HZ);
2830 valid_lft = timeout;
2831 flags = RTF_EXPIRES;
2832 } else {
2833 expires = 0;
2834 flags = 0;
2835 ifa_flags |= IFA_F_PERMANENT;
2836 }
2837
2838 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2839 if (addrconf_finite_timeout(timeout)) {
2840 if (timeout == 0)
2841 ifa_flags |= IFA_F_DEPRECATED;
2842 prefered_lft = timeout;
2843 }
2844
2845 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2846 valid_lft, prefered_lft);
2847
2848 if (!IS_ERR(ifp)) {
2849 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2850 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2851 expires, flags);
2852 }
2853
2854 /*
2855 * Note that section 3.1 of RFC 4429 indicates
2856 * that the Optimistic flag should not be set for
2857 * manually configured addresses
2858 */
2859 addrconf_dad_start(ifp);
2860 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2861 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2862 true, jiffies);
2863 in6_ifa_put(ifp);
2864 addrconf_verify_rtnl();
2865 return 0;
2866 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2867 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2868 false, pfx, ifindex);
2869 }
2870
2871 return PTR_ERR(ifp);
2872 }
2873
2874 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2875 const struct in6_addr *pfx, unsigned int plen)
2876 {
2877 struct inet6_ifaddr *ifp;
2878 struct inet6_dev *idev;
2879 struct net_device *dev;
2880
2881 if (plen > 128)
2882 return -EINVAL;
2883
2884 dev = __dev_get_by_index(net, ifindex);
2885 if (!dev)
2886 return -ENODEV;
2887
2888 idev = __in6_dev_get(dev);
2889 if (!idev)
2890 return -ENXIO;
2891
2892 read_lock_bh(&idev->lock);
2893 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2894 if (ifp->prefix_len == plen &&
2895 ipv6_addr_equal(pfx, &ifp->addr)) {
2896 in6_ifa_hold(ifp);
2897 read_unlock_bh(&idev->lock);
2898
2899 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2900 (ifa_flags & IFA_F_MANAGETEMPADDR))
2901 manage_tempaddrs(idev, ifp, 0, 0, false,
2902 jiffies);
2903 ipv6_del_addr(ifp);
2904 addrconf_verify_rtnl();
2905 if (ipv6_addr_is_multicast(pfx)) {
2906 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2907 false, pfx, dev->ifindex);
2908 }
2909 return 0;
2910 }
2911 }
2912 read_unlock_bh(&idev->lock);
2913 return -EADDRNOTAVAIL;
2914 }
2915
2916
2917 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2918 {
2919 struct in6_ifreq ireq;
2920 int err;
2921
2922 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2923 return -EPERM;
2924
2925 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2926 return -EFAULT;
2927
2928 rtnl_lock();
2929 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2930 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2931 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2932 rtnl_unlock();
2933 return err;
2934 }
2935
2936 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2937 {
2938 struct in6_ifreq ireq;
2939 int err;
2940
2941 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2942 return -EPERM;
2943
2944 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2945 return -EFAULT;
2946
2947 rtnl_lock();
2948 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2949 ireq.ifr6_prefixlen);
2950 rtnl_unlock();
2951 return err;
2952 }
2953
2954 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2955 int plen, int scope)
2956 {
2957 struct inet6_ifaddr *ifp;
2958
2959 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2960 scope, IFA_F_PERMANENT,
2961 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2962 if (!IS_ERR(ifp)) {
2963 spin_lock_bh(&ifp->lock);
2964 ifp->flags &= ~IFA_F_TENTATIVE;
2965 spin_unlock_bh(&ifp->lock);
2966 rt_genid_bump_ipv6(dev_net(idev->dev));
2967 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2968 in6_ifa_put(ifp);
2969 }
2970 }
2971
2972 #if IS_ENABLED(CONFIG_IPV6_SIT)
2973 static void sit_add_v4_addrs(struct inet6_dev *idev)
2974 {
2975 struct in6_addr addr;
2976 struct net_device *dev;
2977 struct net *net = dev_net(idev->dev);
2978 int scope, plen;
2979 u32 pflags = 0;
2980
2981 ASSERT_RTNL();
2982
2983 memset(&addr, 0, sizeof(struct in6_addr));
2984 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2985
2986 if (idev->dev->flags&IFF_POINTOPOINT) {
2987 addr.s6_addr32[0] = htonl(0xfe800000);
2988 scope = IFA_LINK;
2989 plen = 64;
2990 } else {
2991 scope = IPV6_ADDR_COMPATv4;
2992 plen = 96;
2993 pflags |= RTF_NONEXTHOP;
2994 }
2995
2996 if (addr.s6_addr32[3]) {
2997 add_addr(idev, &addr, plen, scope);
2998 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2999 return;
3000 }
3001
3002 for_each_netdev(net, dev) {
3003 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3004 if (in_dev && (dev->flags & IFF_UP)) {
3005 struct in_ifaddr *ifa;
3006
3007 int flag = scope;
3008
3009 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
3010
3011 addr.s6_addr32[3] = ifa->ifa_local;
3012
3013 if (ifa->ifa_scope == RT_SCOPE_LINK)
3014 continue;
3015 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3016 if (idev->dev->flags&IFF_POINTOPOINT)
3017 continue;
3018 flag |= IFA_HOST;
3019 }
3020
3021 add_addr(idev, &addr, plen, flag);
3022 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3023 pflags);
3024 }
3025 }
3026 }
3027 }
3028 #endif
3029
3030 static void init_loopback(struct net_device *dev)
3031 {
3032 struct inet6_dev *idev;
3033 struct net_device *sp_dev;
3034 struct inet6_ifaddr *sp_ifa;
3035 struct rt6_info *sp_rt;
3036
3037 /* ::1 */
3038
3039 ASSERT_RTNL();
3040
3041 idev = ipv6_find_idev(dev);
3042 if (!idev) {
3043 pr_debug("%s: add_dev failed\n", __func__);
3044 return;
3045 }
3046
3047 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3048
3049 /* Add routes to other interface's IPv6 addresses */
3050 for_each_netdev(dev_net(dev), sp_dev) {
3051 if (!strcmp(sp_dev->name, dev->name))
3052 continue;
3053
3054 idev = __in6_dev_get(sp_dev);
3055 if (!idev)
3056 continue;
3057
3058 read_lock_bh(&idev->lock);
3059 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3060
3061 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3062 continue;
3063
3064 if (sp_ifa->rt) {
3065 /* This dst has been added to garbage list when
3066 * lo device down, release this obsolete dst and
3067 * reallocate a new router for ifa.
3068 */
3069 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
3070 ip6_rt_put(sp_ifa->rt);
3071 sp_ifa->rt = NULL;
3072 } else {
3073 continue;
3074 }
3075 }
3076
3077 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3078
3079 /* Failure cases are ignored */
3080 if (!IS_ERR(sp_rt)) {
3081 sp_ifa->rt = sp_rt;
3082 ip6_ins_rt(sp_rt);
3083 }
3084 }
3085 read_unlock_bh(&idev->lock);
3086 }
3087 }
3088
3089 void addrconf_add_linklocal(struct inet6_dev *idev,
3090 const struct in6_addr *addr, u32 flags)
3091 {
3092 struct inet6_ifaddr *ifp;
3093 u32 addr_flags = flags | IFA_F_PERMANENT;
3094
3095 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3096 if (idev->cnf.optimistic_dad &&
3097 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3098 addr_flags |= IFA_F_OPTIMISTIC;
3099 #endif
3100
3101 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3102 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3103 if (!IS_ERR(ifp)) {
3104 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3105 addrconf_dad_start(ifp);
3106 in6_ifa_put(ifp);
3107 }
3108 }
3109 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3110
3111 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3112 {
3113 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3114 return true;
3115
3116 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3117 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3118 return true;
3119
3120 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3121 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3122 return true;
3123
3124 return false;
3125 }
3126
3127 static int ipv6_generate_stable_address(struct in6_addr *address,
3128 u8 dad_count,
3129 const struct inet6_dev *idev)
3130 {
3131 static DEFINE_SPINLOCK(lock);
3132 static __u32 digest[SHA_DIGEST_WORDS];
3133 static __u32 workspace[SHA_WORKSPACE_WORDS];
3134
3135 static union {
3136 char __data[SHA_MESSAGE_BYTES];
3137 struct {
3138 struct in6_addr secret;
3139 __be32 prefix[2];
3140 unsigned char hwaddr[MAX_ADDR_LEN];
3141 u8 dad_count;
3142 } __packed;
3143 } data;
3144
3145 struct in6_addr secret;
3146 struct in6_addr temp;
3147 struct net *net = dev_net(idev->dev);
3148
3149 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3150
3151 if (idev->cnf.stable_secret.initialized)
3152 secret = idev->cnf.stable_secret.secret;
3153 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3154 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3155 else
3156 return -1;
3157
3158 retry:
3159 spin_lock_bh(&lock);
3160
3161 sha_init(digest);
3162 memset(&data, 0, sizeof(data));
3163 memset(workspace, 0, sizeof(workspace));
3164 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3165 data.prefix[0] = address->s6_addr32[0];
3166 data.prefix[1] = address->s6_addr32[1];
3167 data.secret = secret;
3168 data.dad_count = dad_count;
3169
3170 sha_transform(digest, data.__data, workspace);
3171
3172 temp = *address;
3173 temp.s6_addr32[2] = (__force __be32)digest[0];
3174 temp.s6_addr32[3] = (__force __be32)digest[1];
3175
3176 spin_unlock_bh(&lock);
3177
3178 if (ipv6_reserved_interfaceid(temp)) {
3179 dad_count++;
3180 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3181 return -1;
3182 goto retry;
3183 }
3184
3185 *address = temp;
3186 return 0;
3187 }
3188
3189 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3190 {
3191 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3192
3193 if (s->initialized)
3194 return;
3195 s = &idev->cnf.stable_secret;
3196 get_random_bytes(&s->secret, sizeof(s->secret));
3197 s->initialized = true;
3198 }
3199
3200 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3201 {
3202 struct in6_addr addr;
3203
3204 /* no link local addresses on L3 master devices */
3205 if (netif_is_l3_master(idev->dev))
3206 return;
3207
3208 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3209
3210 switch (idev->cnf.addr_gen_mode) {
3211 case IN6_ADDR_GEN_MODE_RANDOM:
3212 ipv6_gen_mode_random_init(idev);
3213 /* fallthrough */
3214 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3215 if (!ipv6_generate_stable_address(&addr, 0, idev))
3216 addrconf_add_linklocal(idev, &addr,
3217 IFA_F_STABLE_PRIVACY);
3218 else if (prefix_route)
3219 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3220 break;
3221 case IN6_ADDR_GEN_MODE_EUI64:
3222 /* addrconf_add_linklocal also adds a prefix_route and we
3223 * only need to care about prefix routes if ipv6_generate_eui64
3224 * couldn't generate one.
3225 */
3226 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3227 addrconf_add_linklocal(idev, &addr, 0);
3228 else if (prefix_route)
3229 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3230 break;
3231 case IN6_ADDR_GEN_MODE_NONE:
3232 default:
3233 /* will not add any link local address */
3234 break;
3235 }
3236 }
3237
3238 static void addrconf_dev_config(struct net_device *dev)
3239 {
3240 struct inet6_dev *idev;
3241
3242 ASSERT_RTNL();
3243
3244 if ((dev->type != ARPHRD_ETHER) &&
3245 (dev->type != ARPHRD_FDDI) &&
3246 (dev->type != ARPHRD_ARCNET) &&
3247 (dev->type != ARPHRD_INFINIBAND) &&
3248 (dev->type != ARPHRD_IEEE1394) &&
3249 (dev->type != ARPHRD_TUNNEL6) &&
3250 (dev->type != ARPHRD_6LOWPAN) &&
3251 (dev->type != ARPHRD_IP6GRE) &&
3252 (dev->type != ARPHRD_IPGRE) &&
3253 (dev->type != ARPHRD_TUNNEL) &&
3254 (dev->type != ARPHRD_NONE)) {
3255 /* Alas, we support only Ethernet autoconfiguration. */
3256 return;
3257 }
3258
3259 idev = addrconf_add_dev(dev);
3260 if (IS_ERR(idev))
3261 return;
3262
3263 /* this device type has no EUI support */
3264 if (dev->type == ARPHRD_NONE &&
3265 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3266 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3267
3268 addrconf_addr_gen(idev, false);
3269 }
3270
3271 #if IS_ENABLED(CONFIG_IPV6_SIT)
3272 static void addrconf_sit_config(struct net_device *dev)
3273 {
3274 struct inet6_dev *idev;
3275
3276 ASSERT_RTNL();
3277
3278 /*
3279 * Configure the tunnel with one of our IPv4
3280 * addresses... we should configure all of
3281 * our v4 addrs in the tunnel
3282 */
3283
3284 idev = ipv6_find_idev(dev);
3285 if (!idev) {
3286 pr_debug("%s: add_dev failed\n", __func__);
3287 return;
3288 }
3289
3290 if (dev->priv_flags & IFF_ISATAP) {
3291 addrconf_addr_gen(idev, false);
3292 return;
3293 }
3294
3295 sit_add_v4_addrs(idev);
3296
3297 if (dev->flags&IFF_POINTOPOINT)
3298 addrconf_add_mroute(dev);
3299 }
3300 #endif
3301
3302 #if IS_ENABLED(CONFIG_NET_IPGRE)
3303 static void addrconf_gre_config(struct net_device *dev)
3304 {
3305 struct inet6_dev *idev;
3306
3307 ASSERT_RTNL();
3308
3309 idev = ipv6_find_idev(dev);
3310 if (!idev) {
3311 pr_debug("%s: add_dev failed\n", __func__);
3312 return;
3313 }
3314
3315 addrconf_addr_gen(idev, true);
3316 if (dev->flags & IFF_POINTOPOINT)
3317 addrconf_add_mroute(dev);
3318 }
3319 #endif
3320
3321 static int fixup_permanent_addr(struct inet6_dev *idev,
3322 struct inet6_ifaddr *ifp)
3323 {
3324 /* rt6i_ref == 0 means the host route was removed from the
3325 * FIB, for example, if 'lo' device is taken down. In that
3326 * case regenerate the host route.
3327 */
3328 if (!ifp->rt || !atomic_read(&ifp->rt->rt6i_ref)) {
3329 struct rt6_info *rt, *prev;
3330
3331 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3332 if (unlikely(IS_ERR(rt)))
3333 return PTR_ERR(rt);
3334
3335 /* ifp->rt can be accessed outside of rtnl */
3336 spin_lock(&ifp->lock);
3337 prev = ifp->rt;
3338 ifp->rt = rt;
3339 spin_unlock(&ifp->lock);
3340
3341 ip6_rt_put(prev);
3342 }
3343
3344 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3345 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3346 idev->dev, 0, 0);
3347 }
3348
3349 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3350 addrconf_dad_start(ifp);
3351
3352 return 0;
3353 }
3354
3355 static void addrconf_permanent_addr(struct net_device *dev)
3356 {
3357 struct inet6_ifaddr *ifp, *tmp;
3358 struct inet6_dev *idev;
3359
3360 idev = __in6_dev_get(dev);
3361 if (!idev)
3362 return;
3363
3364 write_lock_bh(&idev->lock);
3365
3366 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3367 if ((ifp->flags & IFA_F_PERMANENT) &&
3368 fixup_permanent_addr(idev, ifp) < 0) {
3369 write_unlock_bh(&idev->lock);
3370 ipv6_del_addr(ifp);
3371 write_lock_bh(&idev->lock);
3372
3373 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3374 idev->dev->name, &ifp->addr);
3375 }
3376 }
3377
3378 write_unlock_bh(&idev->lock);
3379 }
3380
3381 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3382 void *ptr)
3383 {
3384 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3385 struct netdev_notifier_changeupper_info *info;
3386 struct inet6_dev *idev = __in6_dev_get(dev);
3387 struct net *net = dev_net(dev);
3388 int run_pending = 0;
3389 int err;
3390
3391 switch (event) {
3392 case NETDEV_REGISTER:
3393 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3394 idev = ipv6_add_dev(dev);
3395 if (IS_ERR(idev))
3396 return notifier_from_errno(PTR_ERR(idev));
3397 }
3398 break;
3399
3400 case NETDEV_CHANGEMTU:
3401 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3402 if (dev->mtu < IPV6_MIN_MTU) {
3403 addrconf_ifdown(dev, dev != net->loopback_dev);
3404 break;
3405 }
3406
3407 if (idev) {
3408 rt6_mtu_change(dev, dev->mtu);
3409 idev->cnf.mtu6 = dev->mtu;
3410 break;
3411 }
3412
3413 /* allocate new idev */
3414 idev = ipv6_add_dev(dev);
3415 if (IS_ERR(idev))
3416 break;
3417
3418 /* device is still not ready */
3419 if (!(idev->if_flags & IF_READY))
3420 break;
3421
3422 run_pending = 1;
3423
3424 /* fall through */
3425
3426 case NETDEV_UP:
3427 case NETDEV_CHANGE:
3428 if (dev->flags & IFF_SLAVE)
3429 break;
3430
3431 if (idev && idev->cnf.disable_ipv6)
3432 break;
3433
3434 if (event == NETDEV_UP) {
3435 /* restore routes for permanent addresses */
3436 addrconf_permanent_addr(dev);
3437
3438 if (!addrconf_qdisc_ok(dev)) {
3439 /* device is not ready yet. */
3440 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3441 dev->name);
3442 break;
3443 }
3444
3445 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3446 idev = ipv6_add_dev(dev);
3447
3448 if (!IS_ERR_OR_NULL(idev)) {
3449 idev->if_flags |= IF_READY;
3450 run_pending = 1;
3451 }
3452 } else if (event == NETDEV_CHANGE) {
3453 if (!addrconf_qdisc_ok(dev)) {
3454 /* device is still not ready. */
3455 break;
3456 }
3457
3458 if (idev) {
3459 if (idev->if_flags & IF_READY) {
3460 /* device is already configured -
3461 * but resend MLD reports, we might
3462 * have roamed and need to update
3463 * multicast snooping switches
3464 */
3465 ipv6_mc_up(idev);
3466 break;
3467 }
3468 idev->if_flags |= IF_READY;
3469 }
3470
3471 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3472 dev->name);
3473
3474 run_pending = 1;
3475 }
3476
3477 switch (dev->type) {
3478 #if IS_ENABLED(CONFIG_IPV6_SIT)
3479 case ARPHRD_SIT:
3480 addrconf_sit_config(dev);
3481 break;
3482 #endif
3483 #if IS_ENABLED(CONFIG_NET_IPGRE)
3484 case ARPHRD_IPGRE:
3485 addrconf_gre_config(dev);
3486 break;
3487 #endif
3488 case ARPHRD_LOOPBACK:
3489 init_loopback(dev);
3490 break;
3491
3492 default:
3493 addrconf_dev_config(dev);
3494 break;
3495 }
3496
3497 if (!IS_ERR_OR_NULL(idev)) {
3498 if (run_pending)
3499 addrconf_dad_run(idev);
3500
3501 /*
3502 * If the MTU changed during the interface down,
3503 * when the interface up, the changed MTU must be
3504 * reflected in the idev as well as routers.
3505 */
3506 if (idev->cnf.mtu6 != dev->mtu &&
3507 dev->mtu >= IPV6_MIN_MTU) {
3508 rt6_mtu_change(dev, dev->mtu);
3509 idev->cnf.mtu6 = dev->mtu;
3510 }
3511 idev->tstamp = jiffies;
3512 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3513
3514 /*
3515 * If the changed mtu during down is lower than
3516 * IPV6_MIN_MTU stop IPv6 on this interface.
3517 */
3518 if (dev->mtu < IPV6_MIN_MTU)
3519 addrconf_ifdown(dev, dev != net->loopback_dev);
3520 }
3521 break;
3522
3523 case NETDEV_DOWN:
3524 case NETDEV_UNREGISTER:
3525 /*
3526 * Remove all addresses from this interface.
3527 */
3528 addrconf_ifdown(dev, event != NETDEV_DOWN);
3529 break;
3530
3531 case NETDEV_CHANGENAME:
3532 if (idev) {
3533 snmp6_unregister_dev(idev);
3534 addrconf_sysctl_unregister(idev);
3535 err = addrconf_sysctl_register(idev);
3536 if (err)
3537 return notifier_from_errno(err);
3538 err = snmp6_register_dev(idev);
3539 if (err) {
3540 addrconf_sysctl_unregister(idev);
3541 return notifier_from_errno(err);
3542 }
3543 }
3544 break;
3545
3546 case NETDEV_PRE_TYPE_CHANGE:
3547 case NETDEV_POST_TYPE_CHANGE:
3548 if (idev)
3549 addrconf_type_change(dev, event);
3550 break;
3551
3552 case NETDEV_CHANGEUPPER:
3553 info = ptr;
3554
3555 /* flush all routes if dev is linked to or unlinked from
3556 * an L3 master device (e.g., VRF)
3557 */
3558 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3559 addrconf_ifdown(dev, 0);
3560 }
3561
3562 return NOTIFY_OK;
3563 }
3564
3565 /*
3566 * addrconf module should be notified of a device going up
3567 */
3568 static struct notifier_block ipv6_dev_notf = {
3569 .notifier_call = addrconf_notify,
3570 .priority = ADDRCONF_NOTIFY_PRIORITY,
3571 };
3572
3573 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3574 {
3575 struct inet6_dev *idev;
3576 ASSERT_RTNL();
3577
3578 idev = __in6_dev_get(dev);
3579
3580 if (event == NETDEV_POST_TYPE_CHANGE)
3581 ipv6_mc_remap(idev);
3582 else if (event == NETDEV_PRE_TYPE_CHANGE)
3583 ipv6_mc_unmap(idev);
3584 }
3585
3586 static bool addr_is_local(const struct in6_addr *addr)
3587 {
3588 return ipv6_addr_type(addr) &
3589 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3590 }
3591
3592 static int addrconf_ifdown(struct net_device *dev, int how)
3593 {
3594 struct net *net = dev_net(dev);
3595 struct inet6_dev *idev;
3596 struct inet6_ifaddr *ifa, *tmp;
3597 struct list_head del_list;
3598 int _keep_addr;
3599 bool keep_addr;
3600 int state, i;
3601
3602 ASSERT_RTNL();
3603
3604 rt6_ifdown(net, dev);
3605 neigh_ifdown(&nd_tbl, dev);
3606
3607 idev = __in6_dev_get(dev);
3608 if (!idev)
3609 return -ENODEV;
3610
3611 /*
3612 * Step 1: remove reference to ipv6 device from parent device.
3613 * Do not dev_put!
3614 */
3615 if (how) {
3616 idev->dead = 1;
3617
3618 /* protected by rtnl_lock */
3619 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3620
3621 /* Step 1.5: remove snmp6 entry */
3622 snmp6_unregister_dev(idev);
3623
3624 }
3625
3626 /* aggregate the system setting and interface setting */
3627 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3628 if (!_keep_addr)
3629 _keep_addr = idev->cnf.keep_addr_on_down;
3630
3631 /* combine the user config with event to determine if permanent
3632 * addresses are to be removed from address hash table
3633 */
3634 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3635
3636 /* Step 2: clear hash table */
3637 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3638 struct hlist_head *h = &inet6_addr_lst[i];
3639
3640 spin_lock_bh(&addrconf_hash_lock);
3641 restart:
3642 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3643 if (ifa->idev == idev) {
3644 addrconf_del_dad_work(ifa);
3645 /* combined flag + permanent flag decide if
3646 * address is retained on a down event
3647 */
3648 if (!keep_addr ||
3649 !(ifa->flags & IFA_F_PERMANENT) ||
3650 addr_is_local(&ifa->addr)) {
3651 hlist_del_init_rcu(&ifa->addr_lst);
3652 goto restart;
3653 }
3654 }
3655 }
3656 spin_unlock_bh(&addrconf_hash_lock);
3657 }
3658
3659 write_lock_bh(&idev->lock);
3660
3661 addrconf_del_rs_timer(idev);
3662
3663 /* Step 2: clear flags for stateless addrconf */
3664 if (!how)
3665 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3666
3667 /* Step 3: clear tempaddr list */
3668 while (!list_empty(&idev->tempaddr_list)) {
3669 ifa = list_first_entry(&idev->tempaddr_list,
3670 struct inet6_ifaddr, tmp_list);
3671 list_del(&ifa->tmp_list);
3672 write_unlock_bh(&idev->lock);
3673 spin_lock_bh(&ifa->lock);
3674
3675 if (ifa->ifpub) {
3676 in6_ifa_put(ifa->ifpub);
3677 ifa->ifpub = NULL;
3678 }
3679 spin_unlock_bh(&ifa->lock);
3680 in6_ifa_put(ifa);
3681 write_lock_bh(&idev->lock);
3682 }
3683
3684 /* re-combine the user config with event to determine if permanent
3685 * addresses are to be removed from the interface list
3686 */
3687 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3688
3689 INIT_LIST_HEAD(&del_list);
3690 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3691 struct rt6_info *rt = NULL;
3692 bool keep;
3693
3694 addrconf_del_dad_work(ifa);
3695
3696 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3697 !addr_is_local(&ifa->addr);
3698 if (!keep)
3699 list_move(&ifa->if_list, &del_list);
3700
3701 write_unlock_bh(&idev->lock);
3702 spin_lock_bh(&ifa->lock);
3703
3704 if (keep) {
3705 /* set state to skip the notifier below */
3706 state = INET6_IFADDR_STATE_DEAD;
3707 ifa->state = INET6_IFADDR_STATE_PREDAD;
3708 if (!(ifa->flags & IFA_F_NODAD))
3709 ifa->flags |= IFA_F_TENTATIVE;
3710
3711 rt = ifa->rt;
3712 ifa->rt = NULL;
3713 } else {
3714 state = ifa->state;
3715 ifa->state = INET6_IFADDR_STATE_DEAD;
3716 }
3717
3718 spin_unlock_bh(&ifa->lock);
3719
3720 if (rt)
3721 ip6_del_rt(rt);
3722
3723 if (state != INET6_IFADDR_STATE_DEAD) {
3724 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3725 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3726 } else {
3727 if (idev->cnf.forwarding)
3728 addrconf_leave_anycast(ifa);
3729 addrconf_leave_solict(ifa->idev, &ifa->addr);
3730 }
3731
3732 write_lock_bh(&idev->lock);
3733 }
3734
3735 write_unlock_bh(&idev->lock);
3736
3737 /* now clean up addresses to be removed */
3738 while (!list_empty(&del_list)) {
3739 ifa = list_first_entry(&del_list,
3740 struct inet6_ifaddr, if_list);
3741 list_del(&ifa->if_list);
3742
3743 in6_ifa_put(ifa);
3744 }
3745
3746 /* Step 5: Discard anycast and multicast list */
3747 if (how) {
3748 ipv6_ac_destroy_dev(idev);
3749 ipv6_mc_destroy_dev(idev);
3750 } else {
3751 ipv6_mc_down(idev);
3752 }
3753
3754 idev->tstamp = jiffies;
3755
3756 /* Last: Shot the device (if unregistered) */
3757 if (how) {
3758 addrconf_sysctl_unregister(idev);
3759 neigh_parms_release(&nd_tbl, idev->nd_parms);
3760 neigh_ifdown(&nd_tbl, dev);
3761 in6_dev_put(idev);
3762 }
3763 return 0;
3764 }
3765
3766 static void addrconf_rs_timer(unsigned long data)
3767 {
3768 struct inet6_dev *idev = (struct inet6_dev *)data;
3769 struct net_device *dev = idev->dev;
3770 struct in6_addr lladdr;
3771
3772 write_lock(&idev->lock);
3773 if (idev->dead || !(idev->if_flags & IF_READY))
3774 goto out;
3775
3776 if (!ipv6_accept_ra(idev))
3777 goto out;
3778
3779 /* Announcement received after solicitation was sent */
3780 if (idev->if_flags & IF_RA_RCVD)
3781 goto out;
3782
3783 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3784 write_unlock(&idev->lock);
3785 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3786 ndisc_send_rs(dev, &lladdr,
3787 &in6addr_linklocal_allrouters);
3788 else
3789 goto put;
3790
3791 write_lock(&idev->lock);
3792 idev->rs_interval = rfc3315_s14_backoff_update(
3793 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3794 /* The wait after the last probe can be shorter */
3795 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3796 idev->cnf.rtr_solicits) ?
3797 idev->cnf.rtr_solicit_delay :
3798 idev->rs_interval);
3799 } else {
3800 /*
3801 * Note: we do not support deprecated "all on-link"
3802 * assumption any longer.
3803 */
3804 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3805 }
3806
3807 out:
3808 write_unlock(&idev->lock);
3809 put:
3810 in6_dev_put(idev);
3811 }
3812
3813 /*
3814 * Duplicate Address Detection
3815 */
3816 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3817 {
3818 unsigned long rand_num;
3819 struct inet6_dev *idev = ifp->idev;
3820 u64 nonce;
3821
3822 if (ifp->flags & IFA_F_OPTIMISTIC)
3823 rand_num = 0;
3824 else
3825 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3826
3827 nonce = 0;
3828 if (idev->cnf.enhanced_dad ||
3829 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3830 do
3831 get_random_bytes(&nonce, 6);
3832 while (nonce == 0);
3833 }
3834 ifp->dad_nonce = nonce;
3835 ifp->dad_probes = idev->cnf.dad_transmits;
3836 addrconf_mod_dad_work(ifp, rand_num);
3837 }
3838
3839 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3840 {
3841 struct inet6_dev *idev = ifp->idev;
3842 struct net_device *dev = idev->dev;
3843 bool bump_id, notify = false;
3844
3845 addrconf_join_solict(dev, &ifp->addr);
3846
3847 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3848
3849 read_lock_bh(&idev->lock);
3850 spin_lock(&ifp->lock);
3851 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3852 goto out;
3853
3854 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3855 idev->cnf.accept_dad < 1 ||
3856 !(ifp->flags&IFA_F_TENTATIVE) ||
3857 ifp->flags & IFA_F_NODAD) {
3858 bump_id = ifp->flags & IFA_F_TENTATIVE;
3859 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3860 spin_unlock(&ifp->lock);
3861 read_unlock_bh(&idev->lock);
3862
3863 addrconf_dad_completed(ifp, bump_id);
3864 return;
3865 }
3866
3867 if (!(idev->if_flags & IF_READY)) {
3868 spin_unlock(&ifp->lock);
3869 read_unlock_bh(&idev->lock);
3870 /*
3871 * If the device is not ready:
3872 * - keep it tentative if it is a permanent address.
3873 * - otherwise, kill it.
3874 */
3875 in6_ifa_hold(ifp);
3876 addrconf_dad_stop(ifp, 0);
3877 return;
3878 }
3879
3880 /*
3881 * Optimistic nodes can start receiving
3882 * Frames right away
3883 */
3884 if (ifp->flags & IFA_F_OPTIMISTIC) {
3885 ip6_ins_rt(ifp->rt);
3886 if (ipv6_use_optimistic_addr(idev)) {
3887 /* Because optimistic nodes can use this address,
3888 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3889 */
3890 notify = true;
3891 }
3892 }
3893
3894 addrconf_dad_kick(ifp);
3895 out:
3896 spin_unlock(&ifp->lock);
3897 read_unlock_bh(&idev->lock);
3898 if (notify)
3899 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3900 }
3901
3902 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3903 {
3904 bool begin_dad = false;
3905
3906 spin_lock_bh(&ifp->lock);
3907 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3908 ifp->state = INET6_IFADDR_STATE_PREDAD;
3909 begin_dad = true;
3910 }
3911 spin_unlock_bh(&ifp->lock);
3912
3913 if (begin_dad)
3914 addrconf_mod_dad_work(ifp, 0);
3915 }
3916
3917 static void addrconf_dad_work(struct work_struct *w)
3918 {
3919 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3920 struct inet6_ifaddr,
3921 dad_work);
3922 struct inet6_dev *idev = ifp->idev;
3923 bool bump_id, disable_ipv6 = false;
3924 struct in6_addr mcaddr;
3925
3926 enum {
3927 DAD_PROCESS,
3928 DAD_BEGIN,
3929 DAD_ABORT,
3930 } action = DAD_PROCESS;
3931
3932 rtnl_lock();
3933
3934 spin_lock_bh(&ifp->lock);
3935 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3936 action = DAD_BEGIN;
3937 ifp->state = INET6_IFADDR_STATE_DAD;
3938 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3939 action = DAD_ABORT;
3940 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3941
3942 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3943 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3944 struct in6_addr addr;
3945
3946 addr.s6_addr32[0] = htonl(0xfe800000);
3947 addr.s6_addr32[1] = 0;
3948
3949 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3950 ipv6_addr_equal(&ifp->addr, &addr)) {
3951 /* DAD failed for link-local based on MAC */
3952 idev->cnf.disable_ipv6 = 1;
3953
3954 pr_info("%s: IPv6 being disabled!\n",
3955 ifp->idev->dev->name);
3956 disable_ipv6 = true;
3957 }
3958 }
3959 }
3960 spin_unlock_bh(&ifp->lock);
3961
3962 if (action == DAD_BEGIN) {
3963 addrconf_dad_begin(ifp);
3964 goto out;
3965 } else if (action == DAD_ABORT) {
3966 in6_ifa_hold(ifp);
3967 addrconf_dad_stop(ifp, 1);
3968 if (disable_ipv6)
3969 addrconf_ifdown(idev->dev, 0);
3970 goto out;
3971 }
3972
3973 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3974 goto out;
3975
3976 write_lock_bh(&idev->lock);
3977 if (idev->dead || !(idev->if_flags & IF_READY)) {
3978 write_unlock_bh(&idev->lock);
3979 goto out;
3980 }
3981
3982 spin_lock(&ifp->lock);
3983 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3984 spin_unlock(&ifp->lock);
3985 write_unlock_bh(&idev->lock);
3986 goto out;
3987 }
3988
3989 if (ifp->dad_probes == 0) {
3990 /*
3991 * DAD was successful
3992 */
3993
3994 bump_id = ifp->flags & IFA_F_TENTATIVE;
3995 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3996 spin_unlock(&ifp->lock);
3997 write_unlock_bh(&idev->lock);
3998
3999 addrconf_dad_completed(ifp, bump_id);
4000
4001 goto out;
4002 }
4003
4004 ifp->dad_probes--;
4005 addrconf_mod_dad_work(ifp,
4006 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4007 spin_unlock(&ifp->lock);
4008 write_unlock_bh(&idev->lock);
4009
4010 /* send a neighbour solicitation for our addr */
4011 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4012 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4013 ifp->dad_nonce);
4014 out:
4015 in6_ifa_put(ifp);
4016 rtnl_unlock();
4017 }
4018
4019 /* ifp->idev must be at least read locked */
4020 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4021 {
4022 struct inet6_ifaddr *ifpiter;
4023 struct inet6_dev *idev = ifp->idev;
4024
4025 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4026 if (ifpiter->scope > IFA_LINK)
4027 break;
4028 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4029 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4030 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4031 IFA_F_PERMANENT)
4032 return false;
4033 }
4034 return true;
4035 }
4036
4037 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
4038 {
4039 struct net_device *dev = ifp->idev->dev;
4040 struct in6_addr lladdr;
4041 bool send_rs, send_mld;
4042
4043 addrconf_del_dad_work(ifp);
4044
4045 /*
4046 * Configure the address for reception. Now it is valid.
4047 */
4048
4049 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4050
4051 /* If added prefix is link local and we are prepared to process
4052 router advertisements, start sending router solicitations.
4053 */
4054
4055 read_lock_bh(&ifp->idev->lock);
4056 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4057 send_rs = send_mld &&
4058 ipv6_accept_ra(ifp->idev) &&
4059 ifp->idev->cnf.rtr_solicits != 0 &&
4060 (dev->flags&IFF_LOOPBACK) == 0;
4061 read_unlock_bh(&ifp->idev->lock);
4062
4063 /* While dad is in progress mld report's source address is in6_addrany.
4064 * Resend with proper ll now.
4065 */
4066 if (send_mld)
4067 ipv6_mc_dad_complete(ifp->idev);
4068
4069 if (send_rs) {
4070 /*
4071 * If a host as already performed a random delay
4072 * [...] as part of DAD [...] there is no need
4073 * to delay again before sending the first RS
4074 */
4075 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4076 return;
4077 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4078
4079 write_lock_bh(&ifp->idev->lock);
4080 spin_lock(&ifp->lock);
4081 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4082 ifp->idev->cnf.rtr_solicit_interval);
4083 ifp->idev->rs_probes = 1;
4084 ifp->idev->if_flags |= IF_RS_SENT;
4085 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4086 spin_unlock(&ifp->lock);
4087 write_unlock_bh(&ifp->idev->lock);
4088 }
4089
4090 if (bump_id)
4091 rt_genid_bump_ipv6(dev_net(dev));
4092
4093 /* Make sure that a new temporary address will be created
4094 * before this temporary address becomes deprecated.
4095 */
4096 if (ifp->flags & IFA_F_TEMPORARY)
4097 addrconf_verify_rtnl();
4098 }
4099
4100 static void addrconf_dad_run(struct inet6_dev *idev)
4101 {
4102 struct inet6_ifaddr *ifp;
4103
4104 read_lock_bh(&idev->lock);
4105 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4106 spin_lock(&ifp->lock);
4107 if (ifp->flags & IFA_F_TENTATIVE &&
4108 ifp->state == INET6_IFADDR_STATE_DAD)
4109 addrconf_dad_kick(ifp);
4110 spin_unlock(&ifp->lock);
4111 }
4112 read_unlock_bh(&idev->lock);
4113 }
4114
4115 #ifdef CONFIG_PROC_FS
4116 struct if6_iter_state {
4117 struct seq_net_private p;
4118 int bucket;
4119 int offset;
4120 };
4121
4122 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4123 {
4124 struct inet6_ifaddr *ifa = NULL;
4125 struct if6_iter_state *state = seq->private;
4126 struct net *net = seq_file_net(seq);
4127 int p = 0;
4128
4129 /* initial bucket if pos is 0 */
4130 if (pos == 0) {
4131 state->bucket = 0;
4132 state->offset = 0;
4133 }
4134
4135 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4136 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4137 addr_lst) {
4138 if (!net_eq(dev_net(ifa->idev->dev), net))
4139 continue;
4140 /* sync with offset */
4141 if (p < state->offset) {
4142 p++;
4143 continue;
4144 }
4145 state->offset++;
4146 return ifa;
4147 }
4148
4149 /* prepare for next bucket */
4150 state->offset = 0;
4151 p = 0;
4152 }
4153 return NULL;
4154 }
4155
4156 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4157 struct inet6_ifaddr *ifa)
4158 {
4159 struct if6_iter_state *state = seq->private;
4160 struct net *net = seq_file_net(seq);
4161
4162 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4163 if (!net_eq(dev_net(ifa->idev->dev), net))
4164 continue;
4165 state->offset++;
4166 return ifa;
4167 }
4168
4169 while (++state->bucket < IN6_ADDR_HSIZE) {
4170 state->offset = 0;
4171 hlist_for_each_entry_rcu_bh(ifa,
4172 &inet6_addr_lst[state->bucket], addr_lst) {
4173 if (!net_eq(dev_net(ifa->idev->dev), net))
4174 continue;
4175 state->offset++;
4176 return ifa;
4177 }
4178 }
4179
4180 return NULL;
4181 }
4182
4183 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4184 __acquires(rcu_bh)
4185 {
4186 rcu_read_lock_bh();
4187 return if6_get_first(seq, *pos);
4188 }
4189
4190 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4191 {
4192 struct inet6_ifaddr *ifa;
4193
4194 ifa = if6_get_next(seq, v);
4195 ++*pos;
4196 return ifa;
4197 }
4198
4199 static void if6_seq_stop(struct seq_file *seq, void *v)
4200 __releases(rcu_bh)
4201 {
4202 rcu_read_unlock_bh();
4203 }
4204
4205 static int if6_seq_show(struct seq_file *seq, void *v)
4206 {
4207 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4208 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4209 &ifp->addr,
4210 ifp->idev->dev->ifindex,
4211 ifp->prefix_len,
4212 ifp->scope,
4213 (u8) ifp->flags,
4214 ifp->idev->dev->name);
4215 return 0;
4216 }
4217
4218 static const struct seq_operations if6_seq_ops = {
4219 .start = if6_seq_start,
4220 .next = if6_seq_next,
4221 .show = if6_seq_show,
4222 .stop = if6_seq_stop,
4223 };
4224
4225 static int if6_seq_open(struct inode *inode, struct file *file)
4226 {
4227 return seq_open_net(inode, file, &if6_seq_ops,
4228 sizeof(struct if6_iter_state));
4229 }
4230
4231 static const struct file_operations if6_fops = {
4232 .owner = THIS_MODULE,
4233 .open = if6_seq_open,
4234 .read = seq_read,
4235 .llseek = seq_lseek,
4236 .release = seq_release_net,
4237 };
4238
4239 static int __net_init if6_proc_net_init(struct net *net)
4240 {
4241 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4242 return -ENOMEM;
4243 return 0;
4244 }
4245
4246 static void __net_exit if6_proc_net_exit(struct net *net)
4247 {
4248 remove_proc_entry("if_inet6", net->proc_net);
4249 }
4250
4251 static struct pernet_operations if6_proc_net_ops = {
4252 .init = if6_proc_net_init,
4253 .exit = if6_proc_net_exit,
4254 };
4255
4256 int __init if6_proc_init(void)
4257 {
4258 return register_pernet_subsys(&if6_proc_net_ops);
4259 }
4260
4261 void if6_proc_exit(void)
4262 {
4263 unregister_pernet_subsys(&if6_proc_net_ops);
4264 }
4265 #endif /* CONFIG_PROC_FS */
4266
4267 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4268 /* Check if address is a home address configured on any interface. */
4269 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4270 {
4271 int ret = 0;
4272 struct inet6_ifaddr *ifp = NULL;
4273 unsigned int hash = inet6_addr_hash(addr);
4274
4275 rcu_read_lock_bh();
4276 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4277 if (!net_eq(dev_net(ifp->idev->dev), net))
4278 continue;
4279 if (ipv6_addr_equal(&ifp->addr, addr) &&
4280 (ifp->flags & IFA_F_HOMEADDRESS)) {
4281 ret = 1;
4282 break;
4283 }
4284 }
4285 rcu_read_unlock_bh();
4286 return ret;
4287 }
4288 #endif
4289
4290 /*
4291 * Periodic address status verification
4292 */
4293
4294 static void addrconf_verify_rtnl(void)
4295 {
4296 unsigned long now, next, next_sec, next_sched;
4297 struct inet6_ifaddr *ifp;
4298 int i;
4299
4300 ASSERT_RTNL();
4301
4302 rcu_read_lock_bh();
4303 now = jiffies;
4304 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4305
4306 cancel_delayed_work(&addr_chk_work);
4307
4308 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4309 restart:
4310 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4311 unsigned long age;
4312
4313 /* When setting preferred_lft to a value not zero or
4314 * infinity, while valid_lft is infinity
4315 * IFA_F_PERMANENT has a non-infinity life time.
4316 */
4317 if ((ifp->flags & IFA_F_PERMANENT) &&
4318 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4319 continue;
4320
4321 spin_lock(&ifp->lock);
4322 /* We try to batch several events at once. */
4323 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4324
4325 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4326 age >= ifp->valid_lft) {
4327 spin_unlock(&ifp->lock);
4328 in6_ifa_hold(ifp);
4329 ipv6_del_addr(ifp);
4330 goto restart;
4331 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4332 spin_unlock(&ifp->lock);
4333 continue;
4334 } else if (age >= ifp->prefered_lft) {
4335 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4336 int deprecate = 0;
4337
4338 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4339 deprecate = 1;
4340 ifp->flags |= IFA_F_DEPRECATED;
4341 }
4342
4343 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4344 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4345 next = ifp->tstamp + ifp->valid_lft * HZ;
4346
4347 spin_unlock(&ifp->lock);
4348
4349 if (deprecate) {
4350 in6_ifa_hold(ifp);
4351
4352 ipv6_ifa_notify(0, ifp);
4353 in6_ifa_put(ifp);
4354 goto restart;
4355 }
4356 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4357 !(ifp->flags&IFA_F_TENTATIVE)) {
4358 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4359 ifp->idev->cnf.dad_transmits *
4360 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4361
4362 if (age >= ifp->prefered_lft - regen_advance) {
4363 struct inet6_ifaddr *ifpub = ifp->ifpub;
4364 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4365 next = ifp->tstamp + ifp->prefered_lft * HZ;
4366 if (!ifp->regen_count && ifpub) {
4367 ifp->regen_count++;
4368 in6_ifa_hold(ifp);
4369 in6_ifa_hold(ifpub);
4370 spin_unlock(&ifp->lock);
4371
4372 spin_lock(&ifpub->lock);
4373 ifpub->regen_count = 0;
4374 spin_unlock(&ifpub->lock);
4375 ipv6_create_tempaddr(ifpub, ifp);
4376 in6_ifa_put(ifpub);
4377 in6_ifa_put(ifp);
4378 goto restart;
4379 }
4380 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4381 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4382 spin_unlock(&ifp->lock);
4383 } else {
4384 /* ifp->prefered_lft <= ifp->valid_lft */
4385 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4386 next = ifp->tstamp + ifp->prefered_lft * HZ;
4387 spin_unlock(&ifp->lock);
4388 }
4389 }
4390 }
4391
4392 next_sec = round_jiffies_up(next);
4393 next_sched = next;
4394
4395 /* If rounded timeout is accurate enough, accept it. */
4396 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4397 next_sched = next_sec;
4398
4399 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4400 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4401 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4402
4403 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4404 now, next, next_sec, next_sched);
4405 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4406 rcu_read_unlock_bh();
4407 }
4408
4409 static void addrconf_verify_work(struct work_struct *w)
4410 {
4411 rtnl_lock();
4412 addrconf_verify_rtnl();
4413 rtnl_unlock();
4414 }
4415
4416 static void addrconf_verify(void)
4417 {
4418 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4419 }
4420
4421 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4422 struct in6_addr **peer_pfx)
4423 {
4424 struct in6_addr *pfx = NULL;
4425
4426 *peer_pfx = NULL;
4427
4428 if (addr)
4429 pfx = nla_data(addr);
4430
4431 if (local) {
4432 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4433 *peer_pfx = pfx;
4434 pfx = nla_data(local);
4435 }
4436
4437 return pfx;
4438 }
4439
4440 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4441 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4442 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4443 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4444 [IFA_FLAGS] = { .len = sizeof(u32) },
4445 };
4446
4447 static int
4448 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4449 struct netlink_ext_ack *extack)
4450 {
4451 struct net *net = sock_net(skb->sk);
4452 struct ifaddrmsg *ifm;
4453 struct nlattr *tb[IFA_MAX+1];
4454 struct in6_addr *pfx, *peer_pfx;
4455 u32 ifa_flags;
4456 int err;
4457
4458 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4459 extack);
4460 if (err < 0)
4461 return err;
4462
4463 ifm = nlmsg_data(nlh);
4464 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4465 if (!pfx)
4466 return -EINVAL;
4467
4468 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4469
4470 /* We ignore other flags so far. */
4471 ifa_flags &= IFA_F_MANAGETEMPADDR;
4472
4473 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4474 ifm->ifa_prefixlen);
4475 }
4476
4477 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4478 u32 prefered_lft, u32 valid_lft)
4479 {
4480 u32 flags;
4481 clock_t expires;
4482 unsigned long timeout;
4483 bool was_managetempaddr;
4484 bool had_prefixroute;
4485
4486 ASSERT_RTNL();
4487
4488 if (!valid_lft || (prefered_lft > valid_lft))
4489 return -EINVAL;
4490
4491 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4492 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4493 return -EINVAL;
4494
4495 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4496 if (addrconf_finite_timeout(timeout)) {
4497 expires = jiffies_to_clock_t(timeout * HZ);
4498 valid_lft = timeout;
4499 flags = RTF_EXPIRES;
4500 } else {
4501 expires = 0;
4502 flags = 0;
4503 ifa_flags |= IFA_F_PERMANENT;
4504 }
4505
4506 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4507 if (addrconf_finite_timeout(timeout)) {
4508 if (timeout == 0)
4509 ifa_flags |= IFA_F_DEPRECATED;
4510 prefered_lft = timeout;
4511 }
4512
4513 spin_lock_bh(&ifp->lock);
4514 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4515 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4516 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4517 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4518 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4519 IFA_F_NOPREFIXROUTE);
4520 ifp->flags |= ifa_flags;
4521 ifp->tstamp = jiffies;
4522 ifp->valid_lft = valid_lft;
4523 ifp->prefered_lft = prefered_lft;
4524
4525 spin_unlock_bh(&ifp->lock);
4526 if (!(ifp->flags&IFA_F_TENTATIVE))
4527 ipv6_ifa_notify(0, ifp);
4528
4529 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4530 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4531 expires, flags);
4532 } else if (had_prefixroute) {
4533 enum cleanup_prefix_rt_t action;
4534 unsigned long rt_expires;
4535
4536 write_lock_bh(&ifp->idev->lock);
4537 action = check_cleanup_prefix_route(ifp, &rt_expires);
4538 write_unlock_bh(&ifp->idev->lock);
4539
4540 if (action != CLEANUP_PREFIX_RT_NOP) {
4541 cleanup_prefix_route(ifp, rt_expires,
4542 action == CLEANUP_PREFIX_RT_DEL);
4543 }
4544 }
4545
4546 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4547 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4548 valid_lft = prefered_lft = 0;
4549 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4550 !was_managetempaddr, jiffies);
4551 }
4552
4553 addrconf_verify_rtnl();
4554
4555 return 0;
4556 }
4557
4558 static int
4559 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4560 struct netlink_ext_ack *extack)
4561 {
4562 struct net *net = sock_net(skb->sk);
4563 struct ifaddrmsg *ifm;
4564 struct nlattr *tb[IFA_MAX+1];
4565 struct in6_addr *pfx, *peer_pfx;
4566 struct inet6_ifaddr *ifa;
4567 struct net_device *dev;
4568 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4569 u32 ifa_flags;
4570 int err;
4571
4572 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4573 extack);
4574 if (err < 0)
4575 return err;
4576
4577 ifm = nlmsg_data(nlh);
4578 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4579 if (!pfx)
4580 return -EINVAL;
4581
4582 if (tb[IFA_CACHEINFO]) {
4583 struct ifa_cacheinfo *ci;
4584
4585 ci = nla_data(tb[IFA_CACHEINFO]);
4586 valid_lft = ci->ifa_valid;
4587 preferred_lft = ci->ifa_prefered;
4588 } else {
4589 preferred_lft = INFINITY_LIFE_TIME;
4590 valid_lft = INFINITY_LIFE_TIME;
4591 }
4592
4593 dev = __dev_get_by_index(net, ifm->ifa_index);
4594 if (!dev)
4595 return -ENODEV;
4596
4597 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4598
4599 /* We ignore other flags so far. */
4600 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4601 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4602
4603 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4604 if (!ifa) {
4605 /*
4606 * It would be best to check for !NLM_F_CREATE here but
4607 * userspace already relies on not having to provide this.
4608 */
4609 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4610 ifm->ifa_prefixlen, ifa_flags,
4611 preferred_lft, valid_lft);
4612 }
4613
4614 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4615 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4616 err = -EEXIST;
4617 else
4618 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4619
4620 in6_ifa_put(ifa);
4621
4622 return err;
4623 }
4624
4625 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4626 u8 scope, int ifindex)
4627 {
4628 struct ifaddrmsg *ifm;
4629
4630 ifm = nlmsg_data(nlh);
4631 ifm->ifa_family = AF_INET6;
4632 ifm->ifa_prefixlen = prefixlen;
4633 ifm->ifa_flags = flags;
4634 ifm->ifa_scope = scope;
4635 ifm->ifa_index = ifindex;
4636 }
4637
4638 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4639 unsigned long tstamp, u32 preferred, u32 valid)
4640 {
4641 struct ifa_cacheinfo ci;
4642
4643 ci.cstamp = cstamp_delta(cstamp);
4644 ci.tstamp = cstamp_delta(tstamp);
4645 ci.ifa_prefered = preferred;
4646 ci.ifa_valid = valid;
4647
4648 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4649 }
4650
4651 static inline int rt_scope(int ifa_scope)
4652 {
4653 if (ifa_scope & IFA_HOST)
4654 return RT_SCOPE_HOST;
4655 else if (ifa_scope & IFA_LINK)
4656 return RT_SCOPE_LINK;
4657 else if (ifa_scope & IFA_SITE)
4658 return RT_SCOPE_SITE;
4659 else
4660 return RT_SCOPE_UNIVERSE;
4661 }
4662
4663 static inline int inet6_ifaddr_msgsize(void)
4664 {
4665 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4666 + nla_total_size(16) /* IFA_LOCAL */
4667 + nla_total_size(16) /* IFA_ADDRESS */
4668 + nla_total_size(sizeof(struct ifa_cacheinfo))
4669 + nla_total_size(4) /* IFA_FLAGS */;
4670 }
4671
4672 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4673 u32 portid, u32 seq, int event, unsigned int flags)
4674 {
4675 struct nlmsghdr *nlh;
4676 u32 preferred, valid;
4677
4678 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4679 if (!nlh)
4680 return -EMSGSIZE;
4681
4682 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4683 ifa->idev->dev->ifindex);
4684
4685 if (!((ifa->flags&IFA_F_PERMANENT) &&
4686 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4687 preferred = ifa->prefered_lft;
4688 valid = ifa->valid_lft;
4689 if (preferred != INFINITY_LIFE_TIME) {
4690 long tval = (jiffies - ifa->tstamp)/HZ;
4691 if (preferred > tval)
4692 preferred -= tval;
4693 else
4694 preferred = 0;
4695 if (valid != INFINITY_LIFE_TIME) {
4696 if (valid > tval)
4697 valid -= tval;
4698 else
4699 valid = 0;
4700 }
4701 }
4702 } else {
4703 preferred = INFINITY_LIFE_TIME;
4704 valid = INFINITY_LIFE_TIME;
4705 }
4706
4707 if (!ipv6_addr_any(&ifa->peer_addr)) {
4708 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4709 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4710 goto error;
4711 } else
4712 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4713 goto error;
4714
4715 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4716 goto error;
4717
4718 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4719 goto error;
4720
4721 nlmsg_end(skb, nlh);
4722 return 0;
4723
4724 error:
4725 nlmsg_cancel(skb, nlh);
4726 return -EMSGSIZE;
4727 }
4728
4729 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4730 u32 portid, u32 seq, int event, u16 flags)
4731 {
4732 struct nlmsghdr *nlh;
4733 u8 scope = RT_SCOPE_UNIVERSE;
4734 int ifindex = ifmca->idev->dev->ifindex;
4735
4736 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4737 scope = RT_SCOPE_SITE;
4738
4739 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4740 if (!nlh)
4741 return -EMSGSIZE;
4742
4743 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4744 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4745 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4746 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4747 nlmsg_cancel(skb, nlh);
4748 return -EMSGSIZE;
4749 }
4750
4751 nlmsg_end(skb, nlh);
4752 return 0;
4753 }
4754
4755 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4756 u32 portid, u32 seq, int event, unsigned int flags)
4757 {
4758 struct nlmsghdr *nlh;
4759 u8 scope = RT_SCOPE_UNIVERSE;
4760 int ifindex = ifaca->aca_idev->dev->ifindex;
4761
4762 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4763 scope = RT_SCOPE_SITE;
4764
4765 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4766 if (!nlh)
4767 return -EMSGSIZE;
4768
4769 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4770 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4771 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4772 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4773 nlmsg_cancel(skb, nlh);
4774 return -EMSGSIZE;
4775 }
4776
4777 nlmsg_end(skb, nlh);
4778 return 0;
4779 }
4780
4781 enum addr_type_t {
4782 UNICAST_ADDR,
4783 MULTICAST_ADDR,
4784 ANYCAST_ADDR,
4785 };
4786
4787 /* called with rcu_read_lock() */
4788 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4789 struct netlink_callback *cb, enum addr_type_t type,
4790 int s_ip_idx, int *p_ip_idx)
4791 {
4792 struct ifmcaddr6 *ifmca;
4793 struct ifacaddr6 *ifaca;
4794 int err = 1;
4795 int ip_idx = *p_ip_idx;
4796
4797 read_lock_bh(&idev->lock);
4798 switch (type) {
4799 case UNICAST_ADDR: {
4800 struct inet6_ifaddr *ifa;
4801
4802 /* unicast address incl. temp addr */
4803 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4804 if (++ip_idx < s_ip_idx)
4805 continue;
4806 err = inet6_fill_ifaddr(skb, ifa,
4807 NETLINK_CB(cb->skb).portid,
4808 cb->nlh->nlmsg_seq,
4809 RTM_NEWADDR,
4810 NLM_F_MULTI);
4811 if (err < 0)
4812 break;
4813 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4814 }
4815 break;
4816 }
4817 case MULTICAST_ADDR:
4818 /* multicast address */
4819 for (ifmca = idev->mc_list; ifmca;
4820 ifmca = ifmca->next, ip_idx++) {
4821 if (ip_idx < s_ip_idx)
4822 continue;
4823 err = inet6_fill_ifmcaddr(skb, ifmca,
4824 NETLINK_CB(cb->skb).portid,
4825 cb->nlh->nlmsg_seq,
4826 RTM_GETMULTICAST,
4827 NLM_F_MULTI);
4828 if (err < 0)
4829 break;
4830 }
4831 break;
4832 case ANYCAST_ADDR:
4833 /* anycast address */
4834 for (ifaca = idev->ac_list; ifaca;
4835 ifaca = ifaca->aca_next, ip_idx++) {
4836 if (ip_idx < s_ip_idx)
4837 continue;
4838 err = inet6_fill_ifacaddr(skb, ifaca,
4839 NETLINK_CB(cb->skb).portid,
4840 cb->nlh->nlmsg_seq,
4841 RTM_GETANYCAST,
4842 NLM_F_MULTI);
4843 if (err < 0)
4844 break;
4845 }
4846 break;
4847 default:
4848 break;
4849 }
4850 read_unlock_bh(&idev->lock);
4851 *p_ip_idx = ip_idx;
4852 return err;
4853 }
4854
4855 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4856 enum addr_type_t type)
4857 {
4858 struct net *net = sock_net(skb->sk);
4859 int h, s_h;
4860 int idx, ip_idx;
4861 int s_idx, s_ip_idx;
4862 struct net_device *dev;
4863 struct inet6_dev *idev;
4864 struct hlist_head *head;
4865
4866 s_h = cb->args[0];
4867 s_idx = idx = cb->args[1];
4868 s_ip_idx = ip_idx = cb->args[2];
4869
4870 rcu_read_lock();
4871 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4872 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4873 idx = 0;
4874 head = &net->dev_index_head[h];
4875 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4876 if (idx < s_idx)
4877 goto cont;
4878 if (h > s_h || idx > s_idx)
4879 s_ip_idx = 0;
4880 ip_idx = 0;
4881 idev = __in6_dev_get(dev);
4882 if (!idev)
4883 goto cont;
4884
4885 if (in6_dump_addrs(idev, skb, cb, type,
4886 s_ip_idx, &ip_idx) < 0)
4887 goto done;
4888 cont:
4889 idx++;
4890 }
4891 }
4892 done:
4893 rcu_read_unlock();
4894 cb->args[0] = h;
4895 cb->args[1] = idx;
4896 cb->args[2] = ip_idx;
4897
4898 return skb->len;
4899 }
4900
4901 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4902 {
4903 enum addr_type_t type = UNICAST_ADDR;
4904
4905 return inet6_dump_addr(skb, cb, type);
4906 }
4907
4908 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4909 {
4910 enum addr_type_t type = MULTICAST_ADDR;
4911
4912 return inet6_dump_addr(skb, cb, type);
4913 }
4914
4915
4916 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4917 {
4918 enum addr_type_t type = ANYCAST_ADDR;
4919
4920 return inet6_dump_addr(skb, cb, type);
4921 }
4922
4923 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4924 struct netlink_ext_ack *extack)
4925 {
4926 struct net *net = sock_net(in_skb->sk);
4927 struct ifaddrmsg *ifm;
4928 struct nlattr *tb[IFA_MAX+1];
4929 struct in6_addr *addr = NULL, *peer;
4930 struct net_device *dev = NULL;
4931 struct inet6_ifaddr *ifa;
4932 struct sk_buff *skb;
4933 int err;
4934
4935 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4936 extack);
4937 if (err < 0)
4938 goto errout;
4939
4940 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4941 if (!addr) {
4942 err = -EINVAL;
4943 goto errout;
4944 }
4945
4946 ifm = nlmsg_data(nlh);
4947 if (ifm->ifa_index)
4948 dev = __dev_get_by_index(net, ifm->ifa_index);
4949
4950 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4951 if (!ifa) {
4952 err = -EADDRNOTAVAIL;
4953 goto errout;
4954 }
4955
4956 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4957 if (!skb) {
4958 err = -ENOBUFS;
4959 goto errout_ifa;
4960 }
4961
4962 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4963 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4964 if (err < 0) {
4965 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4966 WARN_ON(err == -EMSGSIZE);
4967 kfree_skb(skb);
4968 goto errout_ifa;
4969 }
4970 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4971 errout_ifa:
4972 in6_ifa_put(ifa);
4973 errout:
4974 return err;
4975 }
4976
4977 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4978 {
4979 struct sk_buff *skb;
4980 struct net *net = dev_net(ifa->idev->dev);
4981 int err = -ENOBUFS;
4982
4983 /* Don't send DELADDR notification for TENTATIVE address,
4984 * since NEWADDR notification is sent only after removing
4985 * TENTATIVE flag.
4986 */
4987 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4988 return;
4989
4990 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4991 if (!skb)
4992 goto errout;
4993
4994 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4995 if (err < 0) {
4996 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4997 WARN_ON(err == -EMSGSIZE);
4998 kfree_skb(skb);
4999 goto errout;
5000 }
5001 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5002 return;
5003 errout:
5004 if (err < 0)
5005 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5006 }
5007
5008 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5009 __s32 *array, int bytes)
5010 {
5011 BUG_ON(bytes < (DEVCONF_MAX * 4));
5012
5013 memset(array, 0, bytes);
5014 array[DEVCONF_FORWARDING] = cnf->forwarding;
5015 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5016 array[DEVCONF_MTU6] = cnf->mtu6;
5017 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5018 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5019 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5020 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5021 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5022 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5023 jiffies_to_msecs(cnf->rtr_solicit_interval);
5024 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5025 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5026 array[DEVCONF_RTR_SOLICIT_DELAY] =
5027 jiffies_to_msecs(cnf->rtr_solicit_delay);
5028 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5029 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5030 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5031 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5032 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5033 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5034 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5035 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5036 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5037 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5038 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5039 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5040 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5041 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5042 #ifdef CONFIG_IPV6_ROUTER_PREF
5043 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5044 array[DEVCONF_RTR_PROBE_INTERVAL] =
5045 jiffies_to_msecs(cnf->rtr_probe_interval);
5046 #ifdef CONFIG_IPV6_ROUTE_INFO
5047 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5048 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5049 #endif
5050 #endif
5051 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5052 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5053 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5054 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5055 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5056 #endif
5057 #ifdef CONFIG_IPV6_MROUTE
5058 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5059 #endif
5060 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5061 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5062 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5063 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5064 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5065 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5066 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5067 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5068 /* we omit DEVCONF_STABLE_SECRET for now */
5069 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5070 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5071 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5072 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5073 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5074 #ifdef CONFIG_IPV6_SEG6_HMAC
5075 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5076 #endif
5077 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5078 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5079 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5080 }
5081
5082 static inline size_t inet6_ifla6_size(void)
5083 {
5084 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5085 + nla_total_size(sizeof(struct ifla_cacheinfo))
5086 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5087 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5088 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5089 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5090 }
5091
5092 static inline size_t inet6_if_nlmsg_size(void)
5093 {
5094 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5095 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5096 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5097 + nla_total_size(4) /* IFLA_MTU */
5098 + nla_total_size(4) /* IFLA_LINK */
5099 + nla_total_size(1) /* IFLA_OPERSTATE */
5100 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5101 }
5102
5103 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5104 int bytes)
5105 {
5106 int i;
5107 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5108 BUG_ON(pad < 0);
5109
5110 /* Use put_unaligned() because stats may not be aligned for u64. */
5111 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5112 for (i = 1; i < ICMP6_MIB_MAX; i++)
5113 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5114
5115 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5116 }
5117
5118 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5119 int bytes, size_t syncpoff)
5120 {
5121 int i, c;
5122 u64 buff[IPSTATS_MIB_MAX];
5123 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5124
5125 BUG_ON(pad < 0);
5126
5127 memset(buff, 0, sizeof(buff));
5128 buff[0] = IPSTATS_MIB_MAX;
5129
5130 for_each_possible_cpu(c) {
5131 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5132 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5133 }
5134
5135 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5136 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5137 }
5138
5139 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5140 int bytes)
5141 {
5142 switch (attrtype) {
5143 case IFLA_INET6_STATS:
5144 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5145 offsetof(struct ipstats_mib, syncp));
5146 break;
5147 case IFLA_INET6_ICMP6STATS:
5148 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5149 break;
5150 }
5151 }
5152
5153 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5154 u32 ext_filter_mask)
5155 {
5156 struct nlattr *nla;
5157 struct ifla_cacheinfo ci;
5158
5159 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5160 goto nla_put_failure;
5161 ci.max_reasm_len = IPV6_MAXPLEN;
5162 ci.tstamp = cstamp_delta(idev->tstamp);
5163 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5164 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5165 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5166 goto nla_put_failure;
5167 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5168 if (!nla)
5169 goto nla_put_failure;
5170 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5171
5172 /* XXX - MC not implemented */
5173
5174 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5175 return 0;
5176
5177 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5178 if (!nla)
5179 goto nla_put_failure;
5180 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5181
5182 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5183 if (!nla)
5184 goto nla_put_failure;
5185 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5186
5187 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5188 if (!nla)
5189 goto nla_put_failure;
5190
5191 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5192 goto nla_put_failure;
5193
5194 read_lock_bh(&idev->lock);
5195 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5196 read_unlock_bh(&idev->lock);
5197
5198 return 0;
5199
5200 nla_put_failure:
5201 return -EMSGSIZE;
5202 }
5203
5204 static size_t inet6_get_link_af_size(const struct net_device *dev,
5205 u32 ext_filter_mask)
5206 {
5207 if (!__in6_dev_get(dev))
5208 return 0;
5209
5210 return inet6_ifla6_size();
5211 }
5212
5213 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5214 u32 ext_filter_mask)
5215 {
5216 struct inet6_dev *idev = __in6_dev_get(dev);
5217
5218 if (!idev)
5219 return -ENODATA;
5220
5221 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5222 return -EMSGSIZE;
5223
5224 return 0;
5225 }
5226
5227 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5228 {
5229 struct inet6_ifaddr *ifp;
5230 struct net_device *dev = idev->dev;
5231 bool clear_token, update_rs = false;
5232 struct in6_addr ll_addr;
5233
5234 ASSERT_RTNL();
5235
5236 if (!token)
5237 return -EINVAL;
5238 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5239 return -EINVAL;
5240 if (!ipv6_accept_ra(idev))
5241 return -EINVAL;
5242 if (idev->cnf.rtr_solicits == 0)
5243 return -EINVAL;
5244
5245 write_lock_bh(&idev->lock);
5246
5247 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5248 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5249
5250 write_unlock_bh(&idev->lock);
5251
5252 clear_token = ipv6_addr_any(token);
5253 if (clear_token)
5254 goto update_lft;
5255
5256 if (!idev->dead && (idev->if_flags & IF_READY) &&
5257 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5258 IFA_F_OPTIMISTIC)) {
5259 /* If we're not ready, then normal ifup will take care
5260 * of this. Otherwise, we need to request our rs here.
5261 */
5262 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5263 update_rs = true;
5264 }
5265
5266 update_lft:
5267 write_lock_bh(&idev->lock);
5268
5269 if (update_rs) {
5270 idev->if_flags |= IF_RS_SENT;
5271 idev->rs_interval = rfc3315_s14_backoff_init(
5272 idev->cnf.rtr_solicit_interval);
5273 idev->rs_probes = 1;
5274 addrconf_mod_rs_timer(idev, idev->rs_interval);
5275 }
5276
5277 /* Well, that's kinda nasty ... */
5278 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5279 spin_lock(&ifp->lock);
5280 if (ifp->tokenized) {
5281 ifp->valid_lft = 0;
5282 ifp->prefered_lft = 0;
5283 }
5284 spin_unlock(&ifp->lock);
5285 }
5286
5287 write_unlock_bh(&idev->lock);
5288 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5289 addrconf_verify_rtnl();
5290 return 0;
5291 }
5292
5293 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5294 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5295 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5296 };
5297
5298 static int inet6_validate_link_af(const struct net_device *dev,
5299 const struct nlattr *nla)
5300 {
5301 struct nlattr *tb[IFLA_INET6_MAX + 1];
5302
5303 if (dev && !__in6_dev_get(dev))
5304 return -EAFNOSUPPORT;
5305
5306 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5307 NULL);
5308 }
5309
5310 static int check_addr_gen_mode(int mode)
5311 {
5312 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5313 mode != IN6_ADDR_GEN_MODE_NONE &&
5314 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5315 mode != IN6_ADDR_GEN_MODE_RANDOM)
5316 return -EINVAL;
5317 return 1;
5318 }
5319
5320 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5321 int mode)
5322 {
5323 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5324 !idev->cnf.stable_secret.initialized &&
5325 !net->ipv6.devconf_dflt->stable_secret.initialized)
5326 return -EINVAL;
5327 return 1;
5328 }
5329
5330 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5331 {
5332 int err = -EINVAL;
5333 struct inet6_dev *idev = __in6_dev_get(dev);
5334 struct nlattr *tb[IFLA_INET6_MAX + 1];
5335
5336 if (!idev)
5337 return -EAFNOSUPPORT;
5338
5339 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5340 BUG();
5341
5342 if (tb[IFLA_INET6_TOKEN]) {
5343 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5344 if (err)
5345 return err;
5346 }
5347
5348 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5349 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5350
5351 if (check_addr_gen_mode(mode) < 0 ||
5352 check_stable_privacy(idev, dev_net(dev), mode) < 0)
5353 return -EINVAL;
5354
5355 idev->cnf.addr_gen_mode = mode;
5356 err = 0;
5357 }
5358
5359 return err;
5360 }
5361
5362 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5363 u32 portid, u32 seq, int event, unsigned int flags)
5364 {
5365 struct net_device *dev = idev->dev;
5366 struct ifinfomsg *hdr;
5367 struct nlmsghdr *nlh;
5368 void *protoinfo;
5369
5370 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5371 if (!nlh)
5372 return -EMSGSIZE;
5373
5374 hdr = nlmsg_data(nlh);
5375 hdr->ifi_family = AF_INET6;
5376 hdr->__ifi_pad = 0;
5377 hdr->ifi_type = dev->type;
5378 hdr->ifi_index = dev->ifindex;
5379 hdr->ifi_flags = dev_get_flags(dev);
5380 hdr->ifi_change = 0;
5381
5382 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5383 (dev->addr_len &&
5384 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5385 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5386 (dev->ifindex != dev_get_iflink(dev) &&
5387 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5388 nla_put_u8(skb, IFLA_OPERSTATE,
5389 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5390 goto nla_put_failure;
5391 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5392 if (!protoinfo)
5393 goto nla_put_failure;
5394
5395 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5396 goto nla_put_failure;
5397
5398 nla_nest_end(skb, protoinfo);
5399 nlmsg_end(skb, nlh);
5400 return 0;
5401
5402 nla_put_failure:
5403 nlmsg_cancel(skb, nlh);
5404 return -EMSGSIZE;
5405 }
5406
5407 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5408 {
5409 struct net *net = sock_net(skb->sk);
5410 int h, s_h;
5411 int idx = 0, s_idx;
5412 struct net_device *dev;
5413 struct inet6_dev *idev;
5414 struct hlist_head *head;
5415
5416 s_h = cb->args[0];
5417 s_idx = cb->args[1];
5418
5419 rcu_read_lock();
5420 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5421 idx = 0;
5422 head = &net->dev_index_head[h];
5423 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5424 if (idx < s_idx)
5425 goto cont;
5426 idev = __in6_dev_get(dev);
5427 if (!idev)
5428 goto cont;
5429 if (inet6_fill_ifinfo(skb, idev,
5430 NETLINK_CB(cb->skb).portid,
5431 cb->nlh->nlmsg_seq,
5432 RTM_NEWLINK, NLM_F_MULTI) < 0)
5433 goto out;
5434 cont:
5435 idx++;
5436 }
5437 }
5438 out:
5439 rcu_read_unlock();
5440 cb->args[1] = idx;
5441 cb->args[0] = h;
5442
5443 return skb->len;
5444 }
5445
5446 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5447 {
5448 struct sk_buff *skb;
5449 struct net *net = dev_net(idev->dev);
5450 int err = -ENOBUFS;
5451
5452 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5453 if (!skb)
5454 goto errout;
5455
5456 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5457 if (err < 0) {
5458 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5459 WARN_ON(err == -EMSGSIZE);
5460 kfree_skb(skb);
5461 goto errout;
5462 }
5463 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5464 return;
5465 errout:
5466 if (err < 0)
5467 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5468 }
5469
5470 static inline size_t inet6_prefix_nlmsg_size(void)
5471 {
5472 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5473 + nla_total_size(sizeof(struct in6_addr))
5474 + nla_total_size(sizeof(struct prefix_cacheinfo));
5475 }
5476
5477 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5478 struct prefix_info *pinfo, u32 portid, u32 seq,
5479 int event, unsigned int flags)
5480 {
5481 struct prefixmsg *pmsg;
5482 struct nlmsghdr *nlh;
5483 struct prefix_cacheinfo ci;
5484
5485 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5486 if (!nlh)
5487 return -EMSGSIZE;
5488
5489 pmsg = nlmsg_data(nlh);
5490 pmsg->prefix_family = AF_INET6;
5491 pmsg->prefix_pad1 = 0;
5492 pmsg->prefix_pad2 = 0;
5493 pmsg->prefix_ifindex = idev->dev->ifindex;
5494 pmsg->prefix_len = pinfo->prefix_len;
5495 pmsg->prefix_type = pinfo->type;
5496 pmsg->prefix_pad3 = 0;
5497 pmsg->prefix_flags = 0;
5498 if (pinfo->onlink)
5499 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5500 if (pinfo->autoconf)
5501 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5502
5503 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5504 goto nla_put_failure;
5505 ci.preferred_time = ntohl(pinfo->prefered);
5506 ci.valid_time = ntohl(pinfo->valid);
5507 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5508 goto nla_put_failure;
5509 nlmsg_end(skb, nlh);
5510 return 0;
5511
5512 nla_put_failure:
5513 nlmsg_cancel(skb, nlh);
5514 return -EMSGSIZE;
5515 }
5516
5517 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5518 struct prefix_info *pinfo)
5519 {
5520 struct sk_buff *skb;
5521 struct net *net = dev_net(idev->dev);
5522 int err = -ENOBUFS;
5523
5524 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5525 if (!skb)
5526 goto errout;
5527
5528 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5529 if (err < 0) {
5530 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5531 WARN_ON(err == -EMSGSIZE);
5532 kfree_skb(skb);
5533 goto errout;
5534 }
5535 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5536 return;
5537 errout:
5538 if (err < 0)
5539 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5540 }
5541
5542 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5543 {
5544 struct net *net = dev_net(ifp->idev->dev);
5545
5546 if (event)
5547 ASSERT_RTNL();
5548
5549 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5550
5551 switch (event) {
5552 case RTM_NEWADDR:
5553 /*
5554 * If the address was optimistic
5555 * we inserted the route at the start of
5556 * our DAD process, so we don't need
5557 * to do it again
5558 */
5559 if (!(ifp->rt->rt6i_node))
5560 ip6_ins_rt(ifp->rt);
5561 if (ifp->idev->cnf.forwarding)
5562 addrconf_join_anycast(ifp);
5563 if (!ipv6_addr_any(&ifp->peer_addr))
5564 addrconf_prefix_route(&ifp->peer_addr, 128,
5565 ifp->idev->dev, 0, 0);
5566 break;
5567 case RTM_DELADDR:
5568 if (ifp->idev->cnf.forwarding)
5569 addrconf_leave_anycast(ifp);
5570 addrconf_leave_solict(ifp->idev, &ifp->addr);
5571 if (!ipv6_addr_any(&ifp->peer_addr)) {
5572 struct rt6_info *rt;
5573
5574 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5575 ifp->idev->dev, 0, 0);
5576 if (rt)
5577 ip6_del_rt(rt);
5578 }
5579 if (ifp->rt) {
5580 if (dst_hold_safe(&ifp->rt->dst))
5581 ip6_del_rt(ifp->rt);
5582 }
5583 rt_genid_bump_ipv6(net);
5584 break;
5585 }
5586 atomic_inc(&net->ipv6.dev_addr_genid);
5587 }
5588
5589 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5590 {
5591 rcu_read_lock_bh();
5592 if (likely(ifp->idev->dead == 0))
5593 __ipv6_ifa_notify(event, ifp);
5594 rcu_read_unlock_bh();
5595 }
5596
5597 #ifdef CONFIG_SYSCTL
5598
5599 static
5600 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5601 void __user *buffer, size_t *lenp, loff_t *ppos)
5602 {
5603 int *valp = ctl->data;
5604 int val = *valp;
5605 loff_t pos = *ppos;
5606 struct ctl_table lctl;
5607 int ret;
5608
5609 /*
5610 * ctl->data points to idev->cnf.forwarding, we should
5611 * not modify it until we get the rtnl lock.
5612 */
5613 lctl = *ctl;
5614 lctl.data = &val;
5615
5616 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5617
5618 if (write)
5619 ret = addrconf_fixup_forwarding(ctl, valp, val);
5620 if (ret)
5621 *ppos = pos;
5622 return ret;
5623 }
5624
5625 static
5626 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5627 void __user *buffer, size_t *lenp, loff_t *ppos)
5628 {
5629 struct inet6_dev *idev = ctl->extra1;
5630 int min_mtu = IPV6_MIN_MTU;
5631 struct ctl_table lctl;
5632
5633 lctl = *ctl;
5634 lctl.extra1 = &min_mtu;
5635 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5636
5637 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5638 }
5639
5640 static void dev_disable_change(struct inet6_dev *idev)
5641 {
5642 struct netdev_notifier_info info;
5643
5644 if (!idev || !idev->dev)
5645 return;
5646
5647 netdev_notifier_info_init(&info, idev->dev);
5648 if (idev->cnf.disable_ipv6)
5649 addrconf_notify(NULL, NETDEV_DOWN, &info);
5650 else
5651 addrconf_notify(NULL, NETDEV_UP, &info);
5652 }
5653
5654 static void addrconf_disable_change(struct net *net, __s32 newf)
5655 {
5656 struct net_device *dev;
5657 struct inet6_dev *idev;
5658
5659 for_each_netdev(net, dev) {
5660 idev = __in6_dev_get(dev);
5661 if (idev) {
5662 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5663 idev->cnf.disable_ipv6 = newf;
5664 if (changed)
5665 dev_disable_change(idev);
5666 }
5667 }
5668 }
5669
5670 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5671 {
5672 struct net *net;
5673 int old;
5674
5675 if (!rtnl_trylock())
5676 return restart_syscall();
5677
5678 net = (struct net *)table->extra2;
5679 old = *p;
5680 *p = newf;
5681
5682 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5683 rtnl_unlock();
5684 return 0;
5685 }
5686
5687 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5688 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5689 addrconf_disable_change(net, newf);
5690 } else if ((!newf) ^ (!old))
5691 dev_disable_change((struct inet6_dev *)table->extra1);
5692
5693 rtnl_unlock();
5694 return 0;
5695 }
5696
5697 static
5698 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5699 void __user *buffer, size_t *lenp, loff_t *ppos)
5700 {
5701 int *valp = ctl->data;
5702 int val = *valp;
5703 loff_t pos = *ppos;
5704 struct ctl_table lctl;
5705 int ret;
5706
5707 /*
5708 * ctl->data points to idev->cnf.disable_ipv6, we should
5709 * not modify it until we get the rtnl lock.
5710 */
5711 lctl = *ctl;
5712 lctl.data = &val;
5713
5714 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5715
5716 if (write)
5717 ret = addrconf_disable_ipv6(ctl, valp, val);
5718 if (ret)
5719 *ppos = pos;
5720 return ret;
5721 }
5722
5723 static
5724 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5725 void __user *buffer, size_t *lenp, loff_t *ppos)
5726 {
5727 int *valp = ctl->data;
5728 int ret;
5729 int old, new;
5730
5731 old = *valp;
5732 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5733 new = *valp;
5734
5735 if (write && old != new) {
5736 struct net *net = ctl->extra2;
5737
5738 if (!rtnl_trylock())
5739 return restart_syscall();
5740
5741 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5742 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5743 NETCONFA_PROXY_NEIGH,
5744 NETCONFA_IFINDEX_DEFAULT,
5745 net->ipv6.devconf_dflt);
5746 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5747 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5748 NETCONFA_PROXY_NEIGH,
5749 NETCONFA_IFINDEX_ALL,
5750 net->ipv6.devconf_all);
5751 else {
5752 struct inet6_dev *idev = ctl->extra1;
5753
5754 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5755 NETCONFA_PROXY_NEIGH,
5756 idev->dev->ifindex,
5757 &idev->cnf);
5758 }
5759 rtnl_unlock();
5760 }
5761
5762 return ret;
5763 }
5764
5765 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5766 void __user *buffer, size_t *lenp,
5767 loff_t *ppos)
5768 {
5769 int ret = 0;
5770 int new_val;
5771 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5772 struct net *net = (struct net *)ctl->extra2;
5773
5774 if (!rtnl_trylock())
5775 return restart_syscall();
5776
5777 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5778
5779 if (write) {
5780 new_val = *((int *)ctl->data);
5781
5782 if (check_addr_gen_mode(new_val) < 0) {
5783 ret = -EINVAL;
5784 goto out;
5785 }
5786
5787 /* request for default */
5788 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5789 ipv6_devconf_dflt.addr_gen_mode = new_val;
5790
5791 /* request for individual net device */
5792 } else {
5793 if (!idev)
5794 goto out;
5795
5796 if (check_stable_privacy(idev, net, new_val) < 0) {
5797 ret = -EINVAL;
5798 goto out;
5799 }
5800
5801 if (idev->cnf.addr_gen_mode != new_val) {
5802 idev->cnf.addr_gen_mode = new_val;
5803 addrconf_dev_config(idev->dev);
5804 }
5805 }
5806 }
5807
5808 out:
5809 rtnl_unlock();
5810
5811 return ret;
5812 }
5813
5814 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5815 void __user *buffer, size_t *lenp,
5816 loff_t *ppos)
5817 {
5818 int err;
5819 struct in6_addr addr;
5820 char str[IPV6_MAX_STRLEN];
5821 struct ctl_table lctl = *ctl;
5822 struct net *net = ctl->extra2;
5823 struct ipv6_stable_secret *secret = ctl->data;
5824
5825 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5826 return -EIO;
5827
5828 lctl.maxlen = IPV6_MAX_STRLEN;
5829 lctl.data = str;
5830
5831 if (!rtnl_trylock())
5832 return restart_syscall();
5833
5834 if (!write && !secret->initialized) {
5835 err = -EIO;
5836 goto out;
5837 }
5838
5839 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5840 if (err >= sizeof(str)) {
5841 err = -EIO;
5842 goto out;
5843 }
5844
5845 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5846 if (err || !write)
5847 goto out;
5848
5849 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5850 err = -EIO;
5851 goto out;
5852 }
5853
5854 secret->initialized = true;
5855 secret->secret = addr;
5856
5857 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5858 struct net_device *dev;
5859
5860 for_each_netdev(net, dev) {
5861 struct inet6_dev *idev = __in6_dev_get(dev);
5862
5863 if (idev) {
5864 idev->cnf.addr_gen_mode =
5865 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5866 }
5867 }
5868 } else {
5869 struct inet6_dev *idev = ctl->extra1;
5870
5871 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5872 }
5873
5874 out:
5875 rtnl_unlock();
5876
5877 return err;
5878 }
5879
5880 static
5881 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5882 int write,
5883 void __user *buffer,
5884 size_t *lenp,
5885 loff_t *ppos)
5886 {
5887 int *valp = ctl->data;
5888 int val = *valp;
5889 loff_t pos = *ppos;
5890 struct ctl_table lctl;
5891 int ret;
5892
5893 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5894 * we should not modify it until we get the rtnl lock.
5895 */
5896 lctl = *ctl;
5897 lctl.data = &val;
5898
5899 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5900
5901 if (write)
5902 ret = addrconf_fixup_linkdown(ctl, valp, val);
5903 if (ret)
5904 *ppos = pos;
5905 return ret;
5906 }
5907
5908 static
5909 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5910 {
5911 if (rt) {
5912 if (action)
5913 rt->dst.flags |= DST_NOPOLICY;
5914 else
5915 rt->dst.flags &= ~DST_NOPOLICY;
5916 }
5917 }
5918
5919 static
5920 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5921 {
5922 struct inet6_ifaddr *ifa;
5923
5924 read_lock_bh(&idev->lock);
5925 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5926 spin_lock(&ifa->lock);
5927 if (ifa->rt) {
5928 struct rt6_info *rt = ifa->rt;
5929 struct fib6_table *table = rt->rt6i_table;
5930 int cpu;
5931
5932 read_lock(&table->tb6_lock);
5933 addrconf_set_nopolicy(ifa->rt, val);
5934 if (rt->rt6i_pcpu) {
5935 for_each_possible_cpu(cpu) {
5936 struct rt6_info **rtp;
5937
5938 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5939 addrconf_set_nopolicy(*rtp, val);
5940 }
5941 }
5942 read_unlock(&table->tb6_lock);
5943 }
5944 spin_unlock(&ifa->lock);
5945 }
5946 read_unlock_bh(&idev->lock);
5947 }
5948
5949 static
5950 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5951 {
5952 struct inet6_dev *idev;
5953 struct net *net;
5954
5955 if (!rtnl_trylock())
5956 return restart_syscall();
5957
5958 *valp = val;
5959
5960 net = (struct net *)ctl->extra2;
5961 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5962 rtnl_unlock();
5963 return 0;
5964 }
5965
5966 if (valp == &net->ipv6.devconf_all->disable_policy) {
5967 struct net_device *dev;
5968
5969 for_each_netdev(net, dev) {
5970 idev = __in6_dev_get(dev);
5971 if (idev)
5972 addrconf_disable_policy_idev(idev, val);
5973 }
5974 } else {
5975 idev = (struct inet6_dev *)ctl->extra1;
5976 addrconf_disable_policy_idev(idev, val);
5977 }
5978
5979 rtnl_unlock();
5980 return 0;
5981 }
5982
5983 static
5984 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5985 void __user *buffer, size_t *lenp,
5986 loff_t *ppos)
5987 {
5988 int *valp = ctl->data;
5989 int val = *valp;
5990 loff_t pos = *ppos;
5991 struct ctl_table lctl;
5992 int ret;
5993
5994 lctl = *ctl;
5995 lctl.data = &val;
5996 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5997
5998 if (write && (*valp != val))
5999 ret = addrconf_disable_policy(ctl, valp, val);
6000
6001 if (ret)
6002 *ppos = pos;
6003
6004 return ret;
6005 }
6006
6007 static int minus_one = -1;
6008 static const int one = 1;
6009 static const int two_five_five = 255;
6010
6011 static const struct ctl_table addrconf_sysctl[] = {
6012 {
6013 .procname = "forwarding",
6014 .data = &ipv6_devconf.forwarding,
6015 .maxlen = sizeof(int),
6016 .mode = 0644,
6017 .proc_handler = addrconf_sysctl_forward,
6018 },
6019 {
6020 .procname = "hop_limit",
6021 .data = &ipv6_devconf.hop_limit,
6022 .maxlen = sizeof(int),
6023 .mode = 0644,
6024 .proc_handler = proc_dointvec_minmax,
6025 .extra1 = (void *)&one,
6026 .extra2 = (void *)&two_five_five,
6027 },
6028 {
6029 .procname = "mtu",
6030 .data = &ipv6_devconf.mtu6,
6031 .maxlen = sizeof(int),
6032 .mode = 0644,
6033 .proc_handler = addrconf_sysctl_mtu,
6034 },
6035 {
6036 .procname = "accept_ra",
6037 .data = &ipv6_devconf.accept_ra,
6038 .maxlen = sizeof(int),
6039 .mode = 0644,
6040 .proc_handler = proc_dointvec,
6041 },
6042 {
6043 .procname = "accept_redirects",
6044 .data = &ipv6_devconf.accept_redirects,
6045 .maxlen = sizeof(int),
6046 .mode = 0644,
6047 .proc_handler = proc_dointvec,
6048 },
6049 {
6050 .procname = "autoconf",
6051 .data = &ipv6_devconf.autoconf,
6052 .maxlen = sizeof(int),
6053 .mode = 0644,
6054 .proc_handler = proc_dointvec,
6055 },
6056 {
6057 .procname = "dad_transmits",
6058 .data = &ipv6_devconf.dad_transmits,
6059 .maxlen = sizeof(int),
6060 .mode = 0644,
6061 .proc_handler = proc_dointvec,
6062 },
6063 {
6064 .procname = "router_solicitations",
6065 .data = &ipv6_devconf.rtr_solicits,
6066 .maxlen = sizeof(int),
6067 .mode = 0644,
6068 .proc_handler = proc_dointvec_minmax,
6069 .extra1 = &minus_one,
6070 },
6071 {
6072 .procname = "router_solicitation_interval",
6073 .data = &ipv6_devconf.rtr_solicit_interval,
6074 .maxlen = sizeof(int),
6075 .mode = 0644,
6076 .proc_handler = proc_dointvec_jiffies,
6077 },
6078 {
6079 .procname = "router_solicitation_max_interval",
6080 .data = &ipv6_devconf.rtr_solicit_max_interval,
6081 .maxlen = sizeof(int),
6082 .mode = 0644,
6083 .proc_handler = proc_dointvec_jiffies,
6084 },
6085 {
6086 .procname = "router_solicitation_delay",
6087 .data = &ipv6_devconf.rtr_solicit_delay,
6088 .maxlen = sizeof(int),
6089 .mode = 0644,
6090 .proc_handler = proc_dointvec_jiffies,
6091 },
6092 {
6093 .procname = "force_mld_version",
6094 .data = &ipv6_devconf.force_mld_version,
6095 .maxlen = sizeof(int),
6096 .mode = 0644,
6097 .proc_handler = proc_dointvec,
6098 },
6099 {
6100 .procname = "mldv1_unsolicited_report_interval",
6101 .data =
6102 &ipv6_devconf.mldv1_unsolicited_report_interval,
6103 .maxlen = sizeof(int),
6104 .mode = 0644,
6105 .proc_handler = proc_dointvec_ms_jiffies,
6106 },
6107 {
6108 .procname = "mldv2_unsolicited_report_interval",
6109 .data =
6110 &ipv6_devconf.mldv2_unsolicited_report_interval,
6111 .maxlen = sizeof(int),
6112 .mode = 0644,
6113 .proc_handler = proc_dointvec_ms_jiffies,
6114 },
6115 {
6116 .procname = "use_tempaddr",
6117 .data = &ipv6_devconf.use_tempaddr,
6118 .maxlen = sizeof(int),
6119 .mode = 0644,
6120 .proc_handler = proc_dointvec,
6121 },
6122 {
6123 .procname = "temp_valid_lft",
6124 .data = &ipv6_devconf.temp_valid_lft,
6125 .maxlen = sizeof(int),
6126 .mode = 0644,
6127 .proc_handler = proc_dointvec,
6128 },
6129 {
6130 .procname = "temp_prefered_lft",
6131 .data = &ipv6_devconf.temp_prefered_lft,
6132 .maxlen = sizeof(int),
6133 .mode = 0644,
6134 .proc_handler = proc_dointvec,
6135 },
6136 {
6137 .procname = "regen_max_retry",
6138 .data = &ipv6_devconf.regen_max_retry,
6139 .maxlen = sizeof(int),
6140 .mode = 0644,
6141 .proc_handler = proc_dointvec,
6142 },
6143 {
6144 .procname = "max_desync_factor",
6145 .data = &ipv6_devconf.max_desync_factor,
6146 .maxlen = sizeof(int),
6147 .mode = 0644,
6148 .proc_handler = proc_dointvec,
6149 },
6150 {
6151 .procname = "max_addresses",
6152 .data = &ipv6_devconf.max_addresses,
6153 .maxlen = sizeof(int),
6154 .mode = 0644,
6155 .proc_handler = proc_dointvec,
6156 },
6157 {
6158 .procname = "accept_ra_defrtr",
6159 .data = &ipv6_devconf.accept_ra_defrtr,
6160 .maxlen = sizeof(int),
6161 .mode = 0644,
6162 .proc_handler = proc_dointvec,
6163 },
6164 {
6165 .procname = "accept_ra_min_hop_limit",
6166 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6167 .maxlen = sizeof(int),
6168 .mode = 0644,
6169 .proc_handler = proc_dointvec,
6170 },
6171 {
6172 .procname = "accept_ra_pinfo",
6173 .data = &ipv6_devconf.accept_ra_pinfo,
6174 .maxlen = sizeof(int),
6175 .mode = 0644,
6176 .proc_handler = proc_dointvec,
6177 },
6178 #ifdef CONFIG_IPV6_ROUTER_PREF
6179 {
6180 .procname = "accept_ra_rtr_pref",
6181 .data = &ipv6_devconf.accept_ra_rtr_pref,
6182 .maxlen = sizeof(int),
6183 .mode = 0644,
6184 .proc_handler = proc_dointvec,
6185 },
6186 {
6187 .procname = "router_probe_interval",
6188 .data = &ipv6_devconf.rtr_probe_interval,
6189 .maxlen = sizeof(int),
6190 .mode = 0644,
6191 .proc_handler = proc_dointvec_jiffies,
6192 },
6193 #ifdef CONFIG_IPV6_ROUTE_INFO
6194 {
6195 .procname = "accept_ra_rt_info_min_plen",
6196 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6197 .maxlen = sizeof(int),
6198 .mode = 0644,
6199 .proc_handler = proc_dointvec,
6200 },
6201 {
6202 .procname = "accept_ra_rt_info_max_plen",
6203 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6204 .maxlen = sizeof(int),
6205 .mode = 0644,
6206 .proc_handler = proc_dointvec,
6207 },
6208 #endif
6209 #endif
6210 {
6211 .procname = "proxy_ndp",
6212 .data = &ipv6_devconf.proxy_ndp,
6213 .maxlen = sizeof(int),
6214 .mode = 0644,
6215 .proc_handler = addrconf_sysctl_proxy_ndp,
6216 },
6217 {
6218 .procname = "accept_source_route",
6219 .data = &ipv6_devconf.accept_source_route,
6220 .maxlen = sizeof(int),
6221 .mode = 0644,
6222 .proc_handler = proc_dointvec,
6223 },
6224 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6225 {
6226 .procname = "optimistic_dad",
6227 .data = &ipv6_devconf.optimistic_dad,
6228 .maxlen = sizeof(int),
6229 .mode = 0644,
6230 .proc_handler = proc_dointvec,
6231 },
6232 {
6233 .procname = "use_optimistic",
6234 .data = &ipv6_devconf.use_optimistic,
6235 .maxlen = sizeof(int),
6236 .mode = 0644,
6237 .proc_handler = proc_dointvec,
6238 },
6239 #endif
6240 #ifdef CONFIG_IPV6_MROUTE
6241 {
6242 .procname = "mc_forwarding",
6243 .data = &ipv6_devconf.mc_forwarding,
6244 .maxlen = sizeof(int),
6245 .mode = 0444,
6246 .proc_handler = proc_dointvec,
6247 },
6248 #endif
6249 {
6250 .procname = "disable_ipv6",
6251 .data = &ipv6_devconf.disable_ipv6,
6252 .maxlen = sizeof(int),
6253 .mode = 0644,
6254 .proc_handler = addrconf_sysctl_disable,
6255 },
6256 {
6257 .procname = "accept_dad",
6258 .data = &ipv6_devconf.accept_dad,
6259 .maxlen = sizeof(int),
6260 .mode = 0644,
6261 .proc_handler = proc_dointvec,
6262 },
6263 {
6264 .procname = "force_tllao",
6265 .data = &ipv6_devconf.force_tllao,
6266 .maxlen = sizeof(int),
6267 .mode = 0644,
6268 .proc_handler = proc_dointvec
6269 },
6270 {
6271 .procname = "ndisc_notify",
6272 .data = &ipv6_devconf.ndisc_notify,
6273 .maxlen = sizeof(int),
6274 .mode = 0644,
6275 .proc_handler = proc_dointvec
6276 },
6277 {
6278 .procname = "suppress_frag_ndisc",
6279 .data = &ipv6_devconf.suppress_frag_ndisc,
6280 .maxlen = sizeof(int),
6281 .mode = 0644,
6282 .proc_handler = proc_dointvec
6283 },
6284 {
6285 .procname = "accept_ra_from_local",
6286 .data = &ipv6_devconf.accept_ra_from_local,
6287 .maxlen = sizeof(int),
6288 .mode = 0644,
6289 .proc_handler = proc_dointvec,
6290 },
6291 {
6292 .procname = "accept_ra_mtu",
6293 .data = &ipv6_devconf.accept_ra_mtu,
6294 .maxlen = sizeof(int),
6295 .mode = 0644,
6296 .proc_handler = proc_dointvec,
6297 },
6298 {
6299 .procname = "stable_secret",
6300 .data = &ipv6_devconf.stable_secret,
6301 .maxlen = IPV6_MAX_STRLEN,
6302 .mode = 0600,
6303 .proc_handler = addrconf_sysctl_stable_secret,
6304 },
6305 {
6306 .procname = "use_oif_addrs_only",
6307 .data = &ipv6_devconf.use_oif_addrs_only,
6308 .maxlen = sizeof(int),
6309 .mode = 0644,
6310 .proc_handler = proc_dointvec,
6311 },
6312 {
6313 .procname = "ignore_routes_with_linkdown",
6314 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6315 .maxlen = sizeof(int),
6316 .mode = 0644,
6317 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6318 },
6319 {
6320 .procname = "drop_unicast_in_l2_multicast",
6321 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6322 .maxlen = sizeof(int),
6323 .mode = 0644,
6324 .proc_handler = proc_dointvec,
6325 },
6326 {
6327 .procname = "drop_unsolicited_na",
6328 .data = &ipv6_devconf.drop_unsolicited_na,
6329 .maxlen = sizeof(int),
6330 .mode = 0644,
6331 .proc_handler = proc_dointvec,
6332 },
6333 {
6334 .procname = "keep_addr_on_down",
6335 .data = &ipv6_devconf.keep_addr_on_down,
6336 .maxlen = sizeof(int),
6337 .mode = 0644,
6338 .proc_handler = proc_dointvec,
6339
6340 },
6341 {
6342 .procname = "seg6_enabled",
6343 .data = &ipv6_devconf.seg6_enabled,
6344 .maxlen = sizeof(int),
6345 .mode = 0644,
6346 .proc_handler = proc_dointvec,
6347 },
6348 #ifdef CONFIG_IPV6_SEG6_HMAC
6349 {
6350 .procname = "seg6_require_hmac",
6351 .data = &ipv6_devconf.seg6_require_hmac,
6352 .maxlen = sizeof(int),
6353 .mode = 0644,
6354 .proc_handler = proc_dointvec,
6355 },
6356 #endif
6357 {
6358 .procname = "enhanced_dad",
6359 .data = &ipv6_devconf.enhanced_dad,
6360 .maxlen = sizeof(int),
6361 .mode = 0644,
6362 .proc_handler = proc_dointvec,
6363 },
6364 {
6365 .procname = "addr_gen_mode",
6366 .data = &ipv6_devconf.addr_gen_mode,
6367 .maxlen = sizeof(int),
6368 .mode = 0644,
6369 .proc_handler = addrconf_sysctl_addr_gen_mode,
6370 },
6371 {
6372 .procname = "disable_policy",
6373 .data = &ipv6_devconf.disable_policy,
6374 .maxlen = sizeof(int),
6375 .mode = 0644,
6376 .proc_handler = addrconf_sysctl_disable_policy,
6377 },
6378 {
6379 /* sentinel */
6380 }
6381 };
6382
6383 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6384 struct inet6_dev *idev, struct ipv6_devconf *p)
6385 {
6386 int i, ifindex;
6387 struct ctl_table *table;
6388 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6389
6390 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6391 if (!table)
6392 goto out;
6393
6394 for (i = 0; table[i].data; i++) {
6395 table[i].data += (char *)p - (char *)&ipv6_devconf;
6396 /* If one of these is already set, then it is not safe to
6397 * overwrite either of them: this makes proc_dointvec_minmax
6398 * usable.
6399 */
6400 if (!table[i].extra1 && !table[i].extra2) {
6401 table[i].extra1 = idev; /* embedded; no ref */
6402 table[i].extra2 = net;
6403 }
6404 }
6405
6406 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6407
6408 p->sysctl_header = register_net_sysctl(net, path, table);
6409 if (!p->sysctl_header)
6410 goto free;
6411
6412 if (!strcmp(dev_name, "all"))
6413 ifindex = NETCONFA_IFINDEX_ALL;
6414 else if (!strcmp(dev_name, "default"))
6415 ifindex = NETCONFA_IFINDEX_DEFAULT;
6416 else
6417 ifindex = idev->dev->ifindex;
6418 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6419 ifindex, p);
6420 return 0;
6421
6422 free:
6423 kfree(table);
6424 out:
6425 return -ENOBUFS;
6426 }
6427
6428 static void __addrconf_sysctl_unregister(struct net *net,
6429 struct ipv6_devconf *p, int ifindex)
6430 {
6431 struct ctl_table *table;
6432
6433 if (!p->sysctl_header)
6434 return;
6435
6436 table = p->sysctl_header->ctl_table_arg;
6437 unregister_net_sysctl_table(p->sysctl_header);
6438 p->sysctl_header = NULL;
6439 kfree(table);
6440
6441 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6442 }
6443
6444 static int addrconf_sysctl_register(struct inet6_dev *idev)
6445 {
6446 int err;
6447
6448 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6449 return -EINVAL;
6450
6451 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6452 &ndisc_ifinfo_sysctl_change);
6453 if (err)
6454 return err;
6455 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6456 idev, &idev->cnf);
6457 if (err)
6458 neigh_sysctl_unregister(idev->nd_parms);
6459
6460 return err;
6461 }
6462
6463 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6464 {
6465 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6466 idev->dev->ifindex);
6467 neigh_sysctl_unregister(idev->nd_parms);
6468 }
6469
6470
6471 #endif
6472
6473 static int __net_init addrconf_init_net(struct net *net)
6474 {
6475 int err = -ENOMEM;
6476 struct ipv6_devconf *all, *dflt;
6477
6478 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6479 if (!all)
6480 goto err_alloc_all;
6481
6482 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6483 if (!dflt)
6484 goto err_alloc_dflt;
6485
6486 /* these will be inherited by all namespaces */
6487 dflt->autoconf = ipv6_defaults.autoconf;
6488 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6489
6490 dflt->stable_secret.initialized = false;
6491 all->stable_secret.initialized = false;
6492
6493 net->ipv6.devconf_all = all;
6494 net->ipv6.devconf_dflt = dflt;
6495
6496 #ifdef CONFIG_SYSCTL
6497 err = __addrconf_sysctl_register(net, "all", NULL, all);
6498 if (err < 0)
6499 goto err_reg_all;
6500
6501 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6502 if (err < 0)
6503 goto err_reg_dflt;
6504 #endif
6505 return 0;
6506
6507 #ifdef CONFIG_SYSCTL
6508 err_reg_dflt:
6509 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6510 err_reg_all:
6511 kfree(dflt);
6512 #endif
6513 err_alloc_dflt:
6514 kfree(all);
6515 err_alloc_all:
6516 return err;
6517 }
6518
6519 static void __net_exit addrconf_exit_net(struct net *net)
6520 {
6521 #ifdef CONFIG_SYSCTL
6522 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6523 NETCONFA_IFINDEX_DEFAULT);
6524 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6525 NETCONFA_IFINDEX_ALL);
6526 #endif
6527 kfree(net->ipv6.devconf_dflt);
6528 kfree(net->ipv6.devconf_all);
6529 }
6530
6531 static struct pernet_operations addrconf_ops = {
6532 .init = addrconf_init_net,
6533 .exit = addrconf_exit_net,
6534 };
6535
6536 static struct rtnl_af_ops inet6_ops __read_mostly = {
6537 .family = AF_INET6,
6538 .fill_link_af = inet6_fill_link_af,
6539 .get_link_af_size = inet6_get_link_af_size,
6540 .validate_link_af = inet6_validate_link_af,
6541 .set_link_af = inet6_set_link_af,
6542 };
6543
6544 /*
6545 * Init / cleanup code
6546 */
6547
6548 int __init addrconf_init(void)
6549 {
6550 struct inet6_dev *idev;
6551 int i, err;
6552
6553 err = ipv6_addr_label_init();
6554 if (err < 0) {
6555 pr_crit("%s: cannot initialize default policy table: %d\n",
6556 __func__, err);
6557 goto out;
6558 }
6559
6560 err = register_pernet_subsys(&addrconf_ops);
6561 if (err < 0)
6562 goto out_addrlabel;
6563
6564 addrconf_wq = create_workqueue("ipv6_addrconf");
6565 if (!addrconf_wq) {
6566 err = -ENOMEM;
6567 goto out_nowq;
6568 }
6569
6570 /* The addrconf netdev notifier requires that loopback_dev
6571 * has it's ipv6 private information allocated and setup
6572 * before it can bring up and give link-local addresses
6573 * to other devices which are up.
6574 *
6575 * Unfortunately, loopback_dev is not necessarily the first
6576 * entry in the global dev_base list of net devices. In fact,
6577 * it is likely to be the very last entry on that list.
6578 * So this causes the notifier registry below to try and
6579 * give link-local addresses to all devices besides loopback_dev
6580 * first, then loopback_dev, which cases all the non-loopback_dev
6581 * devices to fail to get a link-local address.
6582 *
6583 * So, as a temporary fix, allocate the ipv6 structure for
6584 * loopback_dev first by hand.
6585 * Longer term, all of the dependencies ipv6 has upon the loopback
6586 * device and it being up should be removed.
6587 */
6588 rtnl_lock();
6589 idev = ipv6_add_dev(init_net.loopback_dev);
6590 rtnl_unlock();
6591 if (IS_ERR(idev)) {
6592 err = PTR_ERR(idev);
6593 goto errlo;
6594 }
6595
6596 ip6_route_init_special_entries();
6597
6598 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6599 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6600
6601 register_netdevice_notifier(&ipv6_dev_notf);
6602
6603 addrconf_verify();
6604
6605 rtnl_af_register(&inet6_ops);
6606
6607 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6608 NULL);
6609 if (err < 0)
6610 goto errout;
6611
6612 /* Only the first call to __rtnl_register can fail */
6613 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6614 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6615 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6616 inet6_dump_ifaddr, NULL);
6617 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6618 inet6_dump_ifmcaddr, NULL);
6619 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6620 inet6_dump_ifacaddr, NULL);
6621 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6622 inet6_netconf_dump_devconf, NULL);
6623
6624 ipv6_addr_label_rtnl_register();
6625
6626 return 0;
6627 errout:
6628 rtnl_af_unregister(&inet6_ops);
6629 unregister_netdevice_notifier(&ipv6_dev_notf);
6630 errlo:
6631 destroy_workqueue(addrconf_wq);
6632 out_nowq:
6633 unregister_pernet_subsys(&addrconf_ops);
6634 out_addrlabel:
6635 ipv6_addr_label_cleanup();
6636 out:
6637 return err;
6638 }
6639
6640 void addrconf_cleanup(void)
6641 {
6642 struct net_device *dev;
6643 int i;
6644
6645 unregister_netdevice_notifier(&ipv6_dev_notf);
6646 unregister_pernet_subsys(&addrconf_ops);
6647 ipv6_addr_label_cleanup();
6648
6649 rtnl_lock();
6650
6651 __rtnl_af_unregister(&inet6_ops);
6652
6653 /* clean dev list */
6654 for_each_netdev(&init_net, dev) {
6655 if (__in6_dev_get(dev) == NULL)
6656 continue;
6657 addrconf_ifdown(dev, 1);
6658 }
6659 addrconf_ifdown(init_net.loopback_dev, 2);
6660
6661 /*
6662 * Check hash table.
6663 */
6664 spin_lock_bh(&addrconf_hash_lock);
6665 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6666 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6667 spin_unlock_bh(&addrconf_hash_lock);
6668 cancel_delayed_work(&addr_chk_work);
6669 rtnl_unlock();
6670
6671 destroy_workqueue(addrconf_wq);
6672 }
Linux with added FPC-III support