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Merge branch 'for-4.15/use-timer-setup' into for-linus
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/sched/signal.h>
47 #include <linux/socket.h>
48 #include <linux/sockios.h>
49 #include <linux/net.h>
50 #include <linux/inet.h>
51 #include <linux/in6.h>
52 #include <linux/netdevice.h>
53 #include <linux/if_addr.h>
54 #include <linux/if_arp.h>
55 #include <linux/if_arcnet.h>
56 #include <linux/if_infiniband.h>
57 #include <linux/route.h>
58 #include <linux/inetdevice.h>
59 #include <linux/init.h>
60 #include <linux/slab.h>
61 #ifdef CONFIG_SYSCTL
62 #include <linux/sysctl.h>
63 #endif
64 #include <linux/capability.h>
65 #include <linux/delay.h>
66 #include <linux/notifier.h>
67 #include <linux/string.h>
68 #include <linux/hash.h>
69
70 #include <net/net_namespace.h>
71 #include <net/sock.h>
72 #include <net/snmp.h>
73
74 #include <net/6lowpan.h>
75 #include <net/firewire.h>
76 #include <net/ipv6.h>
77 #include <net/protocol.h>
78 #include <net/ndisc.h>
79 #include <net/ip6_route.h>
80 #include <net/addrconf.h>
81 #include <net/tcp.h>
82 #include <net/ip.h>
83 #include <net/netlink.h>
84 #include <net/pkt_sched.h>
85 #include <net/l3mdev.h>
86 #include <linux/if_tunnel.h>
87 #include <linux/rtnetlink.h>
88 #include <linux/netconf.h>
89 #include <linux/random.h>
90 #include <linux/uaccess.h>
91 #include <asm/unaligned.h>
92
93 #include <linux/proc_fs.h>
94 #include <linux/seq_file.h>
95 #include <linux/export.h>
96
97 /* Set to 3 to get tracing... */
98 #define ACONF_DEBUG 2
99
100 #if ACONF_DEBUG >= 3
101 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
102 #else
103 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
104 #endif
105
106 #define INFINITY_LIFE_TIME 0xFFFFFFFF
107
108 #define IPV6_MAX_STRLEN \
109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
110
111 static inline u32 cstamp_delta(unsigned long cstamp)
112 {
113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
114 }
115
116 static inline s32 rfc3315_s14_backoff_init(s32 irt)
117 {
118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
120 do_div(tmp, 1000000);
121 return (s32)tmp;
122 }
123
124 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
125 {
126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
128 do_div(tmp, 1000000);
129 if ((s32)tmp > mrt) {
130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
132 do_div(tmp, 1000000);
133 }
134 return (s32)tmp;
135 }
136
137 #ifdef CONFIG_SYSCTL
138 static int addrconf_sysctl_register(struct inet6_dev *idev);
139 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
140 #else
141 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
142 {
143 return 0;
144 }
145
146 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
147 {
148 }
149 #endif
150
151 static void ipv6_regen_rndid(struct inet6_dev *idev);
152 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
153
154 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
155 static int ipv6_count_addresses(struct inet6_dev *idev);
156 static int ipv6_generate_stable_address(struct in6_addr *addr,
157 u8 dad_count,
158 const struct inet6_dev *idev);
159
160 /*
161 * Configured unicast address hash table
162 */
163 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
164 static DEFINE_SPINLOCK(addrconf_hash_lock);
165
166 static void addrconf_verify(void);
167 static void addrconf_verify_rtnl(void);
168 static void addrconf_verify_work(struct work_struct *);
169
170 static struct workqueue_struct *addrconf_wq;
171 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
172
173 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
174 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
175
176 static void addrconf_type_change(struct net_device *dev,
177 unsigned long event);
178 static int addrconf_ifdown(struct net_device *dev, int how);
179
180 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
181 int plen,
182 const struct net_device *dev,
183 u32 flags, u32 noflags);
184
185 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
186 static void addrconf_dad_work(struct work_struct *w);
187 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
188 static void addrconf_dad_run(struct inet6_dev *idev);
189 static void addrconf_rs_timer(unsigned long data);
190 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
192
193 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
194 struct prefix_info *pinfo);
195 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
196 struct net_device *dev);
197
198 static struct ipv6_devconf ipv6_devconf __read_mostly = {
199 .forwarding = 0,
200 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
201 .mtu6 = IPV6_MIN_MTU,
202 .accept_ra = 1,
203 .accept_redirects = 1,
204 .autoconf = 1,
205 .force_mld_version = 0,
206 .mldv1_unsolicited_report_interval = 10 * HZ,
207 .mldv2_unsolicited_report_interval = HZ,
208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
213 .use_tempaddr = 0,
214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
218 .max_addresses = IPV6_MAX_ADDRESSES,
219 .accept_ra_defrtr = 1,
220 .accept_ra_from_local = 0,
221 .accept_ra_min_hop_limit= 1,
222 .accept_ra_pinfo = 1,
223 #ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
225 .rtr_probe_interval = 60 * HZ,
226 #ifdef CONFIG_IPV6_ROUTE_INFO
227 .accept_ra_rt_info_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 bool ipv6_use_optimistic_addr(struct net *net,
1403 struct inet6_dev *idev)
1404 {
1405 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1406 if (!idev)
1407 return false;
1408 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1409 return false;
1410 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1411 return false;
1412
1413 return true;
1414 #else
1415 return false;
1416 #endif
1417 }
1418
1419 static int ipv6_get_saddr_eval(struct net *net,
1420 struct ipv6_saddr_score *score,
1421 struct ipv6_saddr_dst *dst,
1422 int i)
1423 {
1424 int ret;
1425
1426 if (i <= score->rule) {
1427 switch (i) {
1428 case IPV6_SADDR_RULE_SCOPE:
1429 ret = score->scopedist;
1430 break;
1431 case IPV6_SADDR_RULE_PREFIX:
1432 ret = score->matchlen;
1433 break;
1434 default:
1435 ret = !!test_bit(i, score->scorebits);
1436 }
1437 goto out;
1438 }
1439
1440 switch (i) {
1441 case IPV6_SADDR_RULE_INIT:
1442 /* Rule 0: remember if hiscore is not ready yet */
1443 ret = !!score->ifa;
1444 break;
1445 case IPV6_SADDR_RULE_LOCAL:
1446 /* Rule 1: Prefer same address */
1447 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1448 break;
1449 case IPV6_SADDR_RULE_SCOPE:
1450 /* Rule 2: Prefer appropriate scope
1451 *
1452 * ret
1453 * ^
1454 * -1 | d 15
1455 * ---+--+-+---> scope
1456 * |
1457 * | d is scope of the destination.
1458 * B-d | \
1459 * | \ <- smaller scope is better if
1460 * B-15 | \ if scope is enough for destination.
1461 * | ret = B - scope (-1 <= scope >= d <= 15).
1462 * d-C-1 | /
1463 * |/ <- greater is better
1464 * -C / if scope is not enough for destination.
1465 * /| ret = scope - C (-1 <= d < scope <= 15).
1466 *
1467 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1468 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1469 * Assume B = 0 and we get C > 29.
1470 */
1471 ret = __ipv6_addr_src_scope(score->addr_type);
1472 if (ret >= dst->scope)
1473 ret = -ret;
1474 else
1475 ret -= 128; /* 30 is enough */
1476 score->scopedist = ret;
1477 break;
1478 case IPV6_SADDR_RULE_PREFERRED:
1479 {
1480 /* Rule 3: Avoid deprecated and optimistic addresses */
1481 u8 avoid = IFA_F_DEPRECATED;
1482
1483 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1484 avoid |= IFA_F_OPTIMISTIC;
1485 ret = ipv6_saddr_preferred(score->addr_type) ||
1486 !(score->ifa->flags & avoid);
1487 break;
1488 }
1489 #ifdef CONFIG_IPV6_MIP6
1490 case IPV6_SADDR_RULE_HOA:
1491 {
1492 /* Rule 4: Prefer home address */
1493 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1494 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1495 break;
1496 }
1497 #endif
1498 case IPV6_SADDR_RULE_OIF:
1499 /* Rule 5: Prefer outgoing interface */
1500 ret = (!dst->ifindex ||
1501 dst->ifindex == score->ifa->idev->dev->ifindex);
1502 break;
1503 case IPV6_SADDR_RULE_LABEL:
1504 /* Rule 6: Prefer matching label */
1505 ret = ipv6_addr_label(net,
1506 &score->ifa->addr, score->addr_type,
1507 score->ifa->idev->dev->ifindex) == dst->label;
1508 break;
1509 case IPV6_SADDR_RULE_PRIVACY:
1510 {
1511 /* Rule 7: Prefer public address
1512 * Note: prefer temporary address if use_tempaddr >= 2
1513 */
1514 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1515 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1516 score->ifa->idev->cnf.use_tempaddr >= 2;
1517 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1518 break;
1519 }
1520 case IPV6_SADDR_RULE_ORCHID:
1521 /* Rule 8-: Prefer ORCHID vs ORCHID or
1522 * non-ORCHID vs non-ORCHID
1523 */
1524 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1525 ipv6_addr_orchid(dst->addr));
1526 break;
1527 case IPV6_SADDR_RULE_PREFIX:
1528 /* Rule 8: Use longest matching prefix */
1529 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1530 if (ret > score->ifa->prefix_len)
1531 ret = score->ifa->prefix_len;
1532 score->matchlen = ret;
1533 break;
1534 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1535 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1536 /* Optimistic addresses still have lower precedence than other
1537 * preferred addresses.
1538 */
1539 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1540 break;
1541 #endif
1542 default:
1543 ret = 0;
1544 }
1545
1546 if (ret)
1547 __set_bit(i, score->scorebits);
1548 score->rule = i;
1549 out:
1550 return ret;
1551 }
1552
1553 static int __ipv6_dev_get_saddr(struct net *net,
1554 struct ipv6_saddr_dst *dst,
1555 struct inet6_dev *idev,
1556 struct ipv6_saddr_score *scores,
1557 int hiscore_idx)
1558 {
1559 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1560
1561 read_lock_bh(&idev->lock);
1562 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1563 int i;
1564
1565 /*
1566 * - Tentative Address (RFC2462 section 5.4)
1567 * - A tentative address is not considered
1568 * "assigned to an interface" in the traditional
1569 * sense, unless it is also flagged as optimistic.
1570 * - Candidate Source Address (section 4)
1571 * - In any case, anycast addresses, multicast
1572 * addresses, and the unspecified address MUST
1573 * NOT be included in a candidate set.
1574 */
1575 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1576 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1577 continue;
1578
1579 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1580
1581 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1582 score->addr_type & IPV6_ADDR_MULTICAST)) {
1583 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1584 idev->dev->name);
1585 continue;
1586 }
1587
1588 score->rule = -1;
1589 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1590
1591 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1592 int minihiscore, miniscore;
1593
1594 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1595 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1596
1597 if (minihiscore > miniscore) {
1598 if (i == IPV6_SADDR_RULE_SCOPE &&
1599 score->scopedist > 0) {
1600 /*
1601 * special case:
1602 * each remaining entry
1603 * has too small (not enough)
1604 * scope, because ifa entries
1605 * are sorted by their scope
1606 * values.
1607 */
1608 goto out;
1609 }
1610 break;
1611 } else if (minihiscore < miniscore) {
1612 if (hiscore->ifa)
1613 in6_ifa_put(hiscore->ifa);
1614
1615 in6_ifa_hold(score->ifa);
1616
1617 swap(hiscore, score);
1618 hiscore_idx = 1 - hiscore_idx;
1619
1620 /* restore our iterator */
1621 score->ifa = hiscore->ifa;
1622
1623 break;
1624 }
1625 }
1626 }
1627 out:
1628 read_unlock_bh(&idev->lock);
1629 return hiscore_idx;
1630 }
1631
1632 static int ipv6_get_saddr_master(struct net *net,
1633 const struct net_device *dst_dev,
1634 const struct net_device *master,
1635 struct ipv6_saddr_dst *dst,
1636 struct ipv6_saddr_score *scores,
1637 int hiscore_idx)
1638 {
1639 struct inet6_dev *idev;
1640
1641 idev = __in6_dev_get(dst_dev);
1642 if (idev)
1643 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1644 scores, hiscore_idx);
1645
1646 idev = __in6_dev_get(master);
1647 if (idev)
1648 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1649 scores, hiscore_idx);
1650
1651 return hiscore_idx;
1652 }
1653
1654 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1655 const struct in6_addr *daddr, unsigned int prefs,
1656 struct in6_addr *saddr)
1657 {
1658 struct ipv6_saddr_score scores[2], *hiscore;
1659 struct ipv6_saddr_dst dst;
1660 struct inet6_dev *idev;
1661 struct net_device *dev;
1662 int dst_type;
1663 bool use_oif_addr = false;
1664 int hiscore_idx = 0;
1665
1666 dst_type = __ipv6_addr_type(daddr);
1667 dst.addr = daddr;
1668 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1669 dst.scope = __ipv6_addr_src_scope(dst_type);
1670 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1671 dst.prefs = prefs;
1672
1673 scores[hiscore_idx].rule = -1;
1674 scores[hiscore_idx].ifa = NULL;
1675
1676 rcu_read_lock();
1677
1678 /* Candidate Source Address (section 4)
1679 * - multicast and link-local destination address,
1680 * the set of candidate source address MUST only
1681 * include addresses assigned to interfaces
1682 * belonging to the same link as the outgoing
1683 * interface.
1684 * (- For site-local destination addresses, the
1685 * set of candidate source addresses MUST only
1686 * include addresses assigned to interfaces
1687 * belonging to the same site as the outgoing
1688 * interface.)
1689 * - "It is RECOMMENDED that the candidate source addresses
1690 * be the set of unicast addresses assigned to the
1691 * interface that will be used to send to the destination
1692 * (the 'outgoing' interface)." (RFC 6724)
1693 */
1694 if (dst_dev) {
1695 idev = __in6_dev_get(dst_dev);
1696 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1697 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1698 (idev && idev->cnf.use_oif_addrs_only)) {
1699 use_oif_addr = true;
1700 }
1701 }
1702
1703 if (use_oif_addr) {
1704 if (idev)
1705 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1706 } else {
1707 const struct net_device *master;
1708 int master_idx = 0;
1709
1710 /* if dst_dev exists and is enslaved to an L3 device, then
1711 * prefer addresses from dst_dev and then the master over
1712 * any other enslaved devices in the L3 domain.
1713 */
1714 master = l3mdev_master_dev_rcu(dst_dev);
1715 if (master) {
1716 master_idx = master->ifindex;
1717
1718 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1719 master, &dst,
1720 scores, hiscore_idx);
1721
1722 if (scores[hiscore_idx].ifa)
1723 goto out;
1724 }
1725
1726 for_each_netdev_rcu(net, dev) {
1727 /* only consider addresses on devices in the
1728 * same L3 domain
1729 */
1730 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1731 continue;
1732 idev = __in6_dev_get(dev);
1733 if (!idev)
1734 continue;
1735 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1736 }
1737 }
1738
1739 out:
1740 rcu_read_unlock();
1741
1742 hiscore = &scores[hiscore_idx];
1743 if (!hiscore->ifa)
1744 return -EADDRNOTAVAIL;
1745
1746 *saddr = hiscore->ifa->addr;
1747 in6_ifa_put(hiscore->ifa);
1748 return 0;
1749 }
1750 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1751
1752 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1753 u32 banned_flags)
1754 {
1755 struct inet6_ifaddr *ifp;
1756 int err = -EADDRNOTAVAIL;
1757
1758 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1759 if (ifp->scope > IFA_LINK)
1760 break;
1761 if (ifp->scope == IFA_LINK &&
1762 !(ifp->flags & banned_flags)) {
1763 *addr = ifp->addr;
1764 err = 0;
1765 break;
1766 }
1767 }
1768 return err;
1769 }
1770
1771 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1772 u32 banned_flags)
1773 {
1774 struct inet6_dev *idev;
1775 int err = -EADDRNOTAVAIL;
1776
1777 rcu_read_lock();
1778 idev = __in6_dev_get(dev);
1779 if (idev) {
1780 read_lock_bh(&idev->lock);
1781 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1782 read_unlock_bh(&idev->lock);
1783 }
1784 rcu_read_unlock();
1785 return err;
1786 }
1787
1788 static int ipv6_count_addresses(struct inet6_dev *idev)
1789 {
1790 int cnt = 0;
1791 struct inet6_ifaddr *ifp;
1792
1793 read_lock_bh(&idev->lock);
1794 list_for_each_entry(ifp, &idev->addr_list, if_list)
1795 cnt++;
1796 read_unlock_bh(&idev->lock);
1797 return cnt;
1798 }
1799
1800 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1801 const struct net_device *dev, int strict)
1802 {
1803 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1804 }
1805 EXPORT_SYMBOL(ipv6_chk_addr);
1806
1807 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1808 const struct net_device *dev, int strict,
1809 u32 banned_flags)
1810 {
1811 struct inet6_ifaddr *ifp;
1812 unsigned int hash = inet6_addr_hash(addr);
1813 u32 ifp_flags;
1814
1815 rcu_read_lock_bh();
1816 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1817 if (!net_eq(dev_net(ifp->idev->dev), net))
1818 continue;
1819 /* Decouple optimistic from tentative for evaluation here.
1820 * Ban optimistic addresses explicitly, when required.
1821 */
1822 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1823 ? (ifp->flags&~IFA_F_TENTATIVE)
1824 : ifp->flags;
1825 if (ipv6_addr_equal(&ifp->addr, addr) &&
1826 !(ifp_flags&banned_flags) &&
1827 (!dev || ifp->idev->dev == dev ||
1828 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1829 rcu_read_unlock_bh();
1830 return 1;
1831 }
1832 }
1833
1834 rcu_read_unlock_bh();
1835 return 0;
1836 }
1837 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1838
1839 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1840 struct net_device *dev)
1841 {
1842 unsigned int hash = inet6_addr_hash(addr);
1843 struct inet6_ifaddr *ifp;
1844
1845 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1846 if (!net_eq(dev_net(ifp->idev->dev), net))
1847 continue;
1848 if (ipv6_addr_equal(&ifp->addr, addr)) {
1849 if (!dev || ifp->idev->dev == dev)
1850 return true;
1851 }
1852 }
1853 return false;
1854 }
1855
1856 /* Compares an address/prefix_len with addresses on device @dev.
1857 * If one is found it returns true.
1858 */
1859 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1860 const unsigned int prefix_len, struct net_device *dev)
1861 {
1862 struct inet6_dev *idev;
1863 struct inet6_ifaddr *ifa;
1864 bool ret = false;
1865
1866 rcu_read_lock();
1867 idev = __in6_dev_get(dev);
1868 if (idev) {
1869 read_lock_bh(&idev->lock);
1870 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1871 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1872 if (ret)
1873 break;
1874 }
1875 read_unlock_bh(&idev->lock);
1876 }
1877 rcu_read_unlock();
1878
1879 return ret;
1880 }
1881 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1882
1883 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1884 {
1885 struct inet6_dev *idev;
1886 struct inet6_ifaddr *ifa;
1887 int onlink;
1888
1889 onlink = 0;
1890 rcu_read_lock();
1891 idev = __in6_dev_get(dev);
1892 if (idev) {
1893 read_lock_bh(&idev->lock);
1894 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1895 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1896 ifa->prefix_len);
1897 if (onlink)
1898 break;
1899 }
1900 read_unlock_bh(&idev->lock);
1901 }
1902 rcu_read_unlock();
1903 return onlink;
1904 }
1905 EXPORT_SYMBOL(ipv6_chk_prefix);
1906
1907 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1908 struct net_device *dev, int strict)
1909 {
1910 struct inet6_ifaddr *ifp, *result = NULL;
1911 unsigned int hash = inet6_addr_hash(addr);
1912
1913 rcu_read_lock_bh();
1914 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1915 if (!net_eq(dev_net(ifp->idev->dev), net))
1916 continue;
1917 if (ipv6_addr_equal(&ifp->addr, addr)) {
1918 if (!dev || ifp->idev->dev == dev ||
1919 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1920 result = ifp;
1921 in6_ifa_hold(ifp);
1922 break;
1923 }
1924 }
1925 }
1926 rcu_read_unlock_bh();
1927
1928 return result;
1929 }
1930
1931 /* Gets referenced address, destroys ifaddr */
1932
1933 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1934 {
1935 if (dad_failed)
1936 ifp->flags |= IFA_F_DADFAILED;
1937
1938 if (ifp->flags&IFA_F_TEMPORARY) {
1939 struct inet6_ifaddr *ifpub;
1940 spin_lock_bh(&ifp->lock);
1941 ifpub = ifp->ifpub;
1942 if (ifpub) {
1943 in6_ifa_hold(ifpub);
1944 spin_unlock_bh(&ifp->lock);
1945 ipv6_create_tempaddr(ifpub, ifp);
1946 in6_ifa_put(ifpub);
1947 } else {
1948 spin_unlock_bh(&ifp->lock);
1949 }
1950 ipv6_del_addr(ifp);
1951 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1952 spin_lock_bh(&ifp->lock);
1953 addrconf_del_dad_work(ifp);
1954 ifp->flags |= IFA_F_TENTATIVE;
1955 spin_unlock_bh(&ifp->lock);
1956 if (dad_failed)
1957 ipv6_ifa_notify(0, ifp);
1958 in6_ifa_put(ifp);
1959 } else {
1960 ipv6_del_addr(ifp);
1961 }
1962 }
1963
1964 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1965 {
1966 int err = -ENOENT;
1967
1968 spin_lock_bh(&ifp->lock);
1969 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1970 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1971 err = 0;
1972 }
1973 spin_unlock_bh(&ifp->lock);
1974
1975 return err;
1976 }
1977
1978 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1979 {
1980 struct inet6_dev *idev = ifp->idev;
1981 struct net *net = dev_net(ifp->idev->dev);
1982
1983 if (addrconf_dad_end(ifp)) {
1984 in6_ifa_put(ifp);
1985 return;
1986 }
1987
1988 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1989 ifp->idev->dev->name, &ifp->addr);
1990
1991 spin_lock_bh(&ifp->lock);
1992
1993 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1994 int scope = ifp->scope;
1995 u32 flags = ifp->flags;
1996 struct in6_addr new_addr;
1997 struct inet6_ifaddr *ifp2;
1998 u32 valid_lft, preferred_lft;
1999 int pfxlen = ifp->prefix_len;
2000 int retries = ifp->stable_privacy_retry + 1;
2001
2002 if (retries > net->ipv6.sysctl.idgen_retries) {
2003 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2004 ifp->idev->dev->name);
2005 goto errdad;
2006 }
2007
2008 new_addr = ifp->addr;
2009 if (ipv6_generate_stable_address(&new_addr, retries,
2010 idev))
2011 goto errdad;
2012
2013 valid_lft = ifp->valid_lft;
2014 preferred_lft = ifp->prefered_lft;
2015
2016 spin_unlock_bh(&ifp->lock);
2017
2018 if (idev->cnf.max_addresses &&
2019 ipv6_count_addresses(idev) >=
2020 idev->cnf.max_addresses)
2021 goto lock_errdad;
2022
2023 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2024 ifp->idev->dev->name);
2025
2026 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2027 scope, flags, valid_lft,
2028 preferred_lft);
2029 if (IS_ERR(ifp2))
2030 goto lock_errdad;
2031
2032 spin_lock_bh(&ifp2->lock);
2033 ifp2->stable_privacy_retry = retries;
2034 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2035 spin_unlock_bh(&ifp2->lock);
2036
2037 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2038 in6_ifa_put(ifp2);
2039 lock_errdad:
2040 spin_lock_bh(&ifp->lock);
2041 }
2042
2043 errdad:
2044 /* transition from _POSTDAD to _ERRDAD */
2045 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2046 spin_unlock_bh(&ifp->lock);
2047
2048 addrconf_mod_dad_work(ifp, 0);
2049 in6_ifa_put(ifp);
2050 }
2051
2052 /* Join to solicited addr multicast group.
2053 * caller must hold RTNL */
2054 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2055 {
2056 struct in6_addr maddr;
2057
2058 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2059 return;
2060
2061 addrconf_addr_solict_mult(addr, &maddr);
2062 ipv6_dev_mc_inc(dev, &maddr);
2063 }
2064
2065 /* caller must hold RTNL */
2066 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2067 {
2068 struct in6_addr maddr;
2069
2070 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2071 return;
2072
2073 addrconf_addr_solict_mult(addr, &maddr);
2074 __ipv6_dev_mc_dec(idev, &maddr);
2075 }
2076
2077 /* caller must hold RTNL */
2078 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2079 {
2080 struct in6_addr addr;
2081
2082 if (ifp->prefix_len >= 127) /* RFC 6164 */
2083 return;
2084 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2085 if (ipv6_addr_any(&addr))
2086 return;
2087 __ipv6_dev_ac_inc(ifp->idev, &addr);
2088 }
2089
2090 /* caller must hold RTNL */
2091 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2092 {
2093 struct in6_addr addr;
2094
2095 if (ifp->prefix_len >= 127) /* RFC 6164 */
2096 return;
2097 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2098 if (ipv6_addr_any(&addr))
2099 return;
2100 __ipv6_dev_ac_dec(ifp->idev, &addr);
2101 }
2102
2103 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2104 {
2105 switch (dev->addr_len) {
2106 case ETH_ALEN:
2107 memcpy(eui, dev->dev_addr, 3);
2108 eui[3] = 0xFF;
2109 eui[4] = 0xFE;
2110 memcpy(eui + 5, dev->dev_addr + 3, 3);
2111 break;
2112 case EUI64_ADDR_LEN:
2113 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2114 eui[0] ^= 2;
2115 break;
2116 default:
2117 return -1;
2118 }
2119
2120 return 0;
2121 }
2122
2123 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2124 {
2125 union fwnet_hwaddr *ha;
2126
2127 if (dev->addr_len != FWNET_ALEN)
2128 return -1;
2129
2130 ha = (union fwnet_hwaddr *)dev->dev_addr;
2131
2132 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2133 eui[0] ^= 2;
2134 return 0;
2135 }
2136
2137 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2138 {
2139 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2140 if (dev->addr_len != ARCNET_ALEN)
2141 return -1;
2142 memset(eui, 0, 7);
2143 eui[7] = *(u8 *)dev->dev_addr;
2144 return 0;
2145 }
2146
2147 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2148 {
2149 if (dev->addr_len != INFINIBAND_ALEN)
2150 return -1;
2151 memcpy(eui, dev->dev_addr + 12, 8);
2152 eui[0] |= 2;
2153 return 0;
2154 }
2155
2156 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2157 {
2158 if (addr == 0)
2159 return -1;
2160 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2161 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2162 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2163 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2164 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2165 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2166 eui[1] = 0;
2167 eui[2] = 0x5E;
2168 eui[3] = 0xFE;
2169 memcpy(eui + 4, &addr, 4);
2170 return 0;
2171 }
2172
2173 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2174 {
2175 if (dev->priv_flags & IFF_ISATAP)
2176 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2177 return -1;
2178 }
2179
2180 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2181 {
2182 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2183 }
2184
2185 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2186 {
2187 memcpy(eui, dev->perm_addr, 3);
2188 memcpy(eui + 5, dev->perm_addr + 3, 3);
2189 eui[3] = 0xFF;
2190 eui[4] = 0xFE;
2191 eui[0] ^= 2;
2192 return 0;
2193 }
2194
2195 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2196 {
2197 switch (dev->type) {
2198 case ARPHRD_ETHER:
2199 case ARPHRD_FDDI:
2200 return addrconf_ifid_eui48(eui, dev);
2201 case ARPHRD_ARCNET:
2202 return addrconf_ifid_arcnet(eui, dev);
2203 case ARPHRD_INFINIBAND:
2204 return addrconf_ifid_infiniband(eui, dev);
2205 case ARPHRD_SIT:
2206 return addrconf_ifid_sit(eui, dev);
2207 case ARPHRD_IPGRE:
2208 case ARPHRD_TUNNEL:
2209 return addrconf_ifid_gre(eui, dev);
2210 case ARPHRD_6LOWPAN:
2211 return addrconf_ifid_6lowpan(eui, dev);
2212 case ARPHRD_IEEE1394:
2213 return addrconf_ifid_ieee1394(eui, dev);
2214 case ARPHRD_TUNNEL6:
2215 case ARPHRD_IP6GRE:
2216 return addrconf_ifid_ip6tnl(eui, dev);
2217 }
2218 return -1;
2219 }
2220
2221 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2222 {
2223 int err = -1;
2224 struct inet6_ifaddr *ifp;
2225
2226 read_lock_bh(&idev->lock);
2227 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2228 if (ifp->scope > IFA_LINK)
2229 break;
2230 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2231 memcpy(eui, ifp->addr.s6_addr+8, 8);
2232 err = 0;
2233 break;
2234 }
2235 }
2236 read_unlock_bh(&idev->lock);
2237 return err;
2238 }
2239
2240 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2241 static void ipv6_regen_rndid(struct inet6_dev *idev)
2242 {
2243 regen:
2244 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2245 idev->rndid[0] &= ~0x02;
2246
2247 /*
2248 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2249 * check if generated address is not inappropriate
2250 *
2251 * - Reserved subnet anycast (RFC 2526)
2252 * 11111101 11....11 1xxxxxxx
2253 * - ISATAP (RFC4214) 6.1
2254 * 00-00-5E-FE-xx-xx-xx-xx
2255 * - value 0
2256 * - XXX: already assigned to an address on the device
2257 */
2258 if (idev->rndid[0] == 0xfd &&
2259 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2260 (idev->rndid[7]&0x80))
2261 goto regen;
2262 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2263 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2264 goto regen;
2265 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2266 goto regen;
2267 }
2268 }
2269
2270 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2271 {
2272 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2273 ipv6_regen_rndid(idev);
2274 }
2275
2276 /*
2277 * Add prefix route.
2278 */
2279
2280 static void
2281 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2282 unsigned long expires, u32 flags)
2283 {
2284 struct fib6_config cfg = {
2285 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2286 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2287 .fc_ifindex = dev->ifindex,
2288 .fc_expires = expires,
2289 .fc_dst_len = plen,
2290 .fc_flags = RTF_UP | flags,
2291 .fc_nlinfo.nl_net = dev_net(dev),
2292 .fc_protocol = RTPROT_KERNEL,
2293 };
2294
2295 cfg.fc_dst = *pfx;
2296
2297 /* Prevent useless cloning on PtP SIT.
2298 This thing is done here expecting that the whole
2299 class of non-broadcast devices need not cloning.
2300 */
2301 #if IS_ENABLED(CONFIG_IPV6_SIT)
2302 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2303 cfg.fc_flags |= RTF_NONEXTHOP;
2304 #endif
2305
2306 ip6_route_add(&cfg, NULL);
2307 }
2308
2309
2310 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2311 int plen,
2312 const struct net_device *dev,
2313 u32 flags, u32 noflags)
2314 {
2315 struct fib6_node *fn;
2316 struct rt6_info *rt = NULL;
2317 struct fib6_table *table;
2318 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2319
2320 table = fib6_get_table(dev_net(dev), tb_id);
2321 if (!table)
2322 return NULL;
2323
2324 read_lock_bh(&table->tb6_lock);
2325 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2326 if (!fn)
2327 goto out;
2328
2329 noflags |= RTF_CACHE;
2330 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2331 if (rt->dst.dev->ifindex != dev->ifindex)
2332 continue;
2333 if ((rt->rt6i_flags & flags) != flags)
2334 continue;
2335 if ((rt->rt6i_flags & noflags) != 0)
2336 continue;
2337 dst_hold(&rt->dst);
2338 break;
2339 }
2340 out:
2341 read_unlock_bh(&table->tb6_lock);
2342 return rt;
2343 }
2344
2345
2346 /* Create "default" multicast route to the interface */
2347
2348 static void addrconf_add_mroute(struct net_device *dev)
2349 {
2350 struct fib6_config cfg = {
2351 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2352 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2353 .fc_ifindex = dev->ifindex,
2354 .fc_dst_len = 8,
2355 .fc_flags = RTF_UP,
2356 .fc_nlinfo.nl_net = dev_net(dev),
2357 };
2358
2359 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2360
2361 ip6_route_add(&cfg, NULL);
2362 }
2363
2364 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2365 {
2366 struct inet6_dev *idev;
2367
2368 ASSERT_RTNL();
2369
2370 idev = ipv6_find_idev(dev);
2371 if (!idev)
2372 return ERR_PTR(-ENOBUFS);
2373
2374 if (idev->cnf.disable_ipv6)
2375 return ERR_PTR(-EACCES);
2376
2377 /* Add default multicast route */
2378 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2379 addrconf_add_mroute(dev);
2380
2381 return idev;
2382 }
2383
2384 static void manage_tempaddrs(struct inet6_dev *idev,
2385 struct inet6_ifaddr *ifp,
2386 __u32 valid_lft, __u32 prefered_lft,
2387 bool create, unsigned long now)
2388 {
2389 u32 flags;
2390 struct inet6_ifaddr *ift;
2391
2392 read_lock_bh(&idev->lock);
2393 /* update all temporary addresses in the list */
2394 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2395 int age, max_valid, max_prefered;
2396
2397 if (ifp != ift->ifpub)
2398 continue;
2399
2400 /* RFC 4941 section 3.3:
2401 * If a received option will extend the lifetime of a public
2402 * address, the lifetimes of temporary addresses should
2403 * be extended, subject to the overall constraint that no
2404 * temporary addresses should ever remain "valid" or "preferred"
2405 * for a time longer than (TEMP_VALID_LIFETIME) or
2406 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2407 */
2408 age = (now - ift->cstamp) / HZ;
2409 max_valid = idev->cnf.temp_valid_lft - age;
2410 if (max_valid < 0)
2411 max_valid = 0;
2412
2413 max_prefered = idev->cnf.temp_prefered_lft -
2414 idev->desync_factor - age;
2415 if (max_prefered < 0)
2416 max_prefered = 0;
2417
2418 if (valid_lft > max_valid)
2419 valid_lft = max_valid;
2420
2421 if (prefered_lft > max_prefered)
2422 prefered_lft = max_prefered;
2423
2424 spin_lock(&ift->lock);
2425 flags = ift->flags;
2426 ift->valid_lft = valid_lft;
2427 ift->prefered_lft = prefered_lft;
2428 ift->tstamp = now;
2429 if (prefered_lft > 0)
2430 ift->flags &= ~IFA_F_DEPRECATED;
2431
2432 spin_unlock(&ift->lock);
2433 if (!(flags&IFA_F_TENTATIVE))
2434 ipv6_ifa_notify(0, ift);
2435 }
2436
2437 if ((create || list_empty(&idev->tempaddr_list)) &&
2438 idev->cnf.use_tempaddr > 0) {
2439 /* When a new public address is created as described
2440 * in [ADDRCONF], also create a new temporary address.
2441 * Also create a temporary address if it's enabled but
2442 * no temporary address currently exists.
2443 */
2444 read_unlock_bh(&idev->lock);
2445 ipv6_create_tempaddr(ifp, NULL);
2446 } else {
2447 read_unlock_bh(&idev->lock);
2448 }
2449 }
2450
2451 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2452 {
2453 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2454 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2455 }
2456
2457 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2458 const struct prefix_info *pinfo,
2459 struct inet6_dev *in6_dev,
2460 const struct in6_addr *addr, int addr_type,
2461 u32 addr_flags, bool sllao, bool tokenized,
2462 __u32 valid_lft, u32 prefered_lft)
2463 {
2464 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2465 int create = 0, update_lft = 0;
2466
2467 if (!ifp && valid_lft) {
2468 int max_addresses = in6_dev->cnf.max_addresses;
2469
2470 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2471 if ((net->ipv6.devconf_all->optimistic_dad ||
2472 in6_dev->cnf.optimistic_dad) &&
2473 !net->ipv6.devconf_all->forwarding && sllao)
2474 addr_flags |= IFA_F_OPTIMISTIC;
2475 #endif
2476
2477 /* Do not allow to create too much of autoconfigured
2478 * addresses; this would be too easy way to crash kernel.
2479 */
2480 if (!max_addresses ||
2481 ipv6_count_addresses(in6_dev) < max_addresses)
2482 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2483 pinfo->prefix_len,
2484 addr_type&IPV6_ADDR_SCOPE_MASK,
2485 addr_flags, valid_lft,
2486 prefered_lft);
2487
2488 if (IS_ERR_OR_NULL(ifp))
2489 return -1;
2490
2491 update_lft = 0;
2492 create = 1;
2493 spin_lock_bh(&ifp->lock);
2494 ifp->flags |= IFA_F_MANAGETEMPADDR;
2495 ifp->cstamp = jiffies;
2496 ifp->tokenized = tokenized;
2497 spin_unlock_bh(&ifp->lock);
2498 addrconf_dad_start(ifp);
2499 }
2500
2501 if (ifp) {
2502 u32 flags;
2503 unsigned long now;
2504 u32 stored_lft;
2505
2506 /* update lifetime (RFC2462 5.5.3 e) */
2507 spin_lock_bh(&ifp->lock);
2508 now = jiffies;
2509 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2510 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2511 else
2512 stored_lft = 0;
2513 if (!update_lft && !create && stored_lft) {
2514 const u32 minimum_lft = min_t(u32,
2515 stored_lft, MIN_VALID_LIFETIME);
2516 valid_lft = max(valid_lft, minimum_lft);
2517
2518 /* RFC4862 Section 5.5.3e:
2519 * "Note that the preferred lifetime of the
2520 * corresponding address is always reset to
2521 * the Preferred Lifetime in the received
2522 * Prefix Information option, regardless of
2523 * whether the valid lifetime is also reset or
2524 * ignored."
2525 *
2526 * So we should always update prefered_lft here.
2527 */
2528 update_lft = 1;
2529 }
2530
2531 if (update_lft) {
2532 ifp->valid_lft = valid_lft;
2533 ifp->prefered_lft = prefered_lft;
2534 ifp->tstamp = now;
2535 flags = ifp->flags;
2536 ifp->flags &= ~IFA_F_DEPRECATED;
2537 spin_unlock_bh(&ifp->lock);
2538
2539 if (!(flags&IFA_F_TENTATIVE))
2540 ipv6_ifa_notify(0, ifp);
2541 } else
2542 spin_unlock_bh(&ifp->lock);
2543
2544 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2545 create, now);
2546
2547 in6_ifa_put(ifp);
2548 addrconf_verify();
2549 }
2550
2551 return 0;
2552 }
2553 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2554
2555 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2556 {
2557 struct prefix_info *pinfo;
2558 __u32 valid_lft;
2559 __u32 prefered_lft;
2560 int addr_type, err;
2561 u32 addr_flags = 0;
2562 struct inet6_dev *in6_dev;
2563 struct net *net = dev_net(dev);
2564
2565 pinfo = (struct prefix_info *) opt;
2566
2567 if (len < sizeof(struct prefix_info)) {
2568 ADBG("addrconf: prefix option too short\n");
2569 return;
2570 }
2571
2572 /*
2573 * Validation checks ([ADDRCONF], page 19)
2574 */
2575
2576 addr_type = ipv6_addr_type(&pinfo->prefix);
2577
2578 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2579 return;
2580
2581 valid_lft = ntohl(pinfo->valid);
2582 prefered_lft = ntohl(pinfo->prefered);
2583
2584 if (prefered_lft > valid_lft) {
2585 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2586 return;
2587 }
2588
2589 in6_dev = in6_dev_get(dev);
2590
2591 if (!in6_dev) {
2592 net_dbg_ratelimited("addrconf: device %s not configured\n",
2593 dev->name);
2594 return;
2595 }
2596
2597 /*
2598 * Two things going on here:
2599 * 1) Add routes for on-link prefixes
2600 * 2) Configure prefixes with the auto flag set
2601 */
2602
2603 if (pinfo->onlink) {
2604 struct rt6_info *rt;
2605 unsigned long rt_expires;
2606
2607 /* Avoid arithmetic overflow. Really, we could
2608 * save rt_expires in seconds, likely valid_lft,
2609 * but it would require division in fib gc, that it
2610 * not good.
2611 */
2612 if (HZ > USER_HZ)
2613 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2614 else
2615 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2616
2617 if (addrconf_finite_timeout(rt_expires))
2618 rt_expires *= HZ;
2619
2620 rt = addrconf_get_prefix_route(&pinfo->prefix,
2621 pinfo->prefix_len,
2622 dev,
2623 RTF_ADDRCONF | RTF_PREFIX_RT,
2624 RTF_GATEWAY | RTF_DEFAULT);
2625
2626 if (rt) {
2627 /* Autoconf prefix route */
2628 if (valid_lft == 0) {
2629 ip6_del_rt(rt);
2630 rt = NULL;
2631 } else if (addrconf_finite_timeout(rt_expires)) {
2632 /* not infinity */
2633 rt6_set_expires(rt, jiffies + rt_expires);
2634 } else {
2635 rt6_clean_expires(rt);
2636 }
2637 } else if (valid_lft) {
2638 clock_t expires = 0;
2639 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2640 if (addrconf_finite_timeout(rt_expires)) {
2641 /* not infinity */
2642 flags |= RTF_EXPIRES;
2643 expires = jiffies_to_clock_t(rt_expires);
2644 }
2645 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2646 dev, expires, flags);
2647 }
2648 ip6_rt_put(rt);
2649 }
2650
2651 /* Try to figure out our local address for this prefix */
2652
2653 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2654 struct in6_addr addr;
2655 bool tokenized = false, dev_addr_generated = false;
2656
2657 if (pinfo->prefix_len == 64) {
2658 memcpy(&addr, &pinfo->prefix, 8);
2659
2660 if (!ipv6_addr_any(&in6_dev->token)) {
2661 read_lock_bh(&in6_dev->lock);
2662 memcpy(addr.s6_addr + 8,
2663 in6_dev->token.s6_addr + 8, 8);
2664 read_unlock_bh(&in6_dev->lock);
2665 tokenized = true;
2666 } else if (is_addr_mode_generate_stable(in6_dev) &&
2667 !ipv6_generate_stable_address(&addr, 0,
2668 in6_dev)) {
2669 addr_flags |= IFA_F_STABLE_PRIVACY;
2670 goto ok;
2671 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2672 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2673 goto put;
2674 } else {
2675 dev_addr_generated = true;
2676 }
2677 goto ok;
2678 }
2679 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2680 pinfo->prefix_len);
2681 goto put;
2682
2683 ok:
2684 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2685 &addr, addr_type,
2686 addr_flags, sllao,
2687 tokenized, valid_lft,
2688 prefered_lft);
2689 if (err)
2690 goto put;
2691
2692 /* Ignore error case here because previous prefix add addr was
2693 * successful which will be notified.
2694 */
2695 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2696 addr_type, addr_flags, sllao,
2697 tokenized, valid_lft,
2698 prefered_lft,
2699 dev_addr_generated);
2700 }
2701 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2702 put:
2703 in6_dev_put(in6_dev);
2704 }
2705
2706 /*
2707 * Set destination address.
2708 * Special case for SIT interfaces where we create a new "virtual"
2709 * device.
2710 */
2711 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2712 {
2713 struct in6_ifreq ireq;
2714 struct net_device *dev;
2715 int err = -EINVAL;
2716
2717 rtnl_lock();
2718
2719 err = -EFAULT;
2720 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2721 goto err_exit;
2722
2723 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2724
2725 err = -ENODEV;
2726 if (!dev)
2727 goto err_exit;
2728
2729 #if IS_ENABLED(CONFIG_IPV6_SIT)
2730 if (dev->type == ARPHRD_SIT) {
2731 const struct net_device_ops *ops = dev->netdev_ops;
2732 struct ifreq ifr;
2733 struct ip_tunnel_parm p;
2734
2735 err = -EADDRNOTAVAIL;
2736 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2737 goto err_exit;
2738
2739 memset(&p, 0, sizeof(p));
2740 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2741 p.iph.saddr = 0;
2742 p.iph.version = 4;
2743 p.iph.ihl = 5;
2744 p.iph.protocol = IPPROTO_IPV6;
2745 p.iph.ttl = 64;
2746 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2747
2748 if (ops->ndo_do_ioctl) {
2749 mm_segment_t oldfs = get_fs();
2750
2751 set_fs(KERNEL_DS);
2752 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2753 set_fs(oldfs);
2754 } else
2755 err = -EOPNOTSUPP;
2756
2757 if (err == 0) {
2758 err = -ENOBUFS;
2759 dev = __dev_get_by_name(net, p.name);
2760 if (!dev)
2761 goto err_exit;
2762 err = dev_open(dev);
2763 }
2764 }
2765 #endif
2766
2767 err_exit:
2768 rtnl_unlock();
2769 return err;
2770 }
2771
2772 static int ipv6_mc_config(struct sock *sk, bool join,
2773 const struct in6_addr *addr, int ifindex)
2774 {
2775 int ret;
2776
2777 ASSERT_RTNL();
2778
2779 lock_sock(sk);
2780 if (join)
2781 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2782 else
2783 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2784 release_sock(sk);
2785
2786 return ret;
2787 }
2788
2789 /*
2790 * Manual configuration of address on an interface
2791 */
2792 static int inet6_addr_add(struct net *net, int ifindex,
2793 const struct in6_addr *pfx,
2794 const struct in6_addr *peer_pfx,
2795 unsigned int plen, __u32 ifa_flags,
2796 __u32 prefered_lft, __u32 valid_lft)
2797 {
2798 struct inet6_ifaddr *ifp;
2799 struct inet6_dev *idev;
2800 struct net_device *dev;
2801 unsigned long timeout;
2802 clock_t expires;
2803 int scope;
2804 u32 flags;
2805
2806 ASSERT_RTNL();
2807
2808 if (plen > 128)
2809 return -EINVAL;
2810
2811 /* check the lifetime */
2812 if (!valid_lft || prefered_lft > valid_lft)
2813 return -EINVAL;
2814
2815 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2816 return -EINVAL;
2817
2818 dev = __dev_get_by_index(net, ifindex);
2819 if (!dev)
2820 return -ENODEV;
2821
2822 idev = addrconf_add_dev(dev);
2823 if (IS_ERR(idev))
2824 return PTR_ERR(idev);
2825
2826 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2827 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2828 true, pfx, ifindex);
2829
2830 if (ret < 0)
2831 return ret;
2832 }
2833
2834 scope = ipv6_addr_scope(pfx);
2835
2836 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2837 if (addrconf_finite_timeout(timeout)) {
2838 expires = jiffies_to_clock_t(timeout * HZ);
2839 valid_lft = timeout;
2840 flags = RTF_EXPIRES;
2841 } else {
2842 expires = 0;
2843 flags = 0;
2844 ifa_flags |= IFA_F_PERMANENT;
2845 }
2846
2847 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2848 if (addrconf_finite_timeout(timeout)) {
2849 if (timeout == 0)
2850 ifa_flags |= IFA_F_DEPRECATED;
2851 prefered_lft = timeout;
2852 }
2853
2854 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2855 valid_lft, prefered_lft);
2856
2857 if (!IS_ERR(ifp)) {
2858 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2859 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2860 expires, flags);
2861 }
2862
2863 /*
2864 * Note that section 3.1 of RFC 4429 indicates
2865 * that the Optimistic flag should not be set for
2866 * manually configured addresses
2867 */
2868 addrconf_dad_start(ifp);
2869 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2870 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2871 true, jiffies);
2872 in6_ifa_put(ifp);
2873 addrconf_verify_rtnl();
2874 return 0;
2875 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2876 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2877 false, pfx, ifindex);
2878 }
2879
2880 return PTR_ERR(ifp);
2881 }
2882
2883 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2884 const struct in6_addr *pfx, unsigned int plen)
2885 {
2886 struct inet6_ifaddr *ifp;
2887 struct inet6_dev *idev;
2888 struct net_device *dev;
2889
2890 if (plen > 128)
2891 return -EINVAL;
2892
2893 dev = __dev_get_by_index(net, ifindex);
2894 if (!dev)
2895 return -ENODEV;
2896
2897 idev = __in6_dev_get(dev);
2898 if (!idev)
2899 return -ENXIO;
2900
2901 read_lock_bh(&idev->lock);
2902 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2903 if (ifp->prefix_len == plen &&
2904 ipv6_addr_equal(pfx, &ifp->addr)) {
2905 in6_ifa_hold(ifp);
2906 read_unlock_bh(&idev->lock);
2907
2908 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2909 (ifa_flags & IFA_F_MANAGETEMPADDR))
2910 manage_tempaddrs(idev, ifp, 0, 0, false,
2911 jiffies);
2912 ipv6_del_addr(ifp);
2913 addrconf_verify_rtnl();
2914 if (ipv6_addr_is_multicast(pfx)) {
2915 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2916 false, pfx, dev->ifindex);
2917 }
2918 return 0;
2919 }
2920 }
2921 read_unlock_bh(&idev->lock);
2922 return -EADDRNOTAVAIL;
2923 }
2924
2925
2926 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2927 {
2928 struct in6_ifreq ireq;
2929 int err;
2930
2931 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2932 return -EPERM;
2933
2934 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2935 return -EFAULT;
2936
2937 rtnl_lock();
2938 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2939 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2940 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2941 rtnl_unlock();
2942 return err;
2943 }
2944
2945 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2946 {
2947 struct in6_ifreq ireq;
2948 int err;
2949
2950 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2951 return -EPERM;
2952
2953 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2954 return -EFAULT;
2955
2956 rtnl_lock();
2957 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2958 ireq.ifr6_prefixlen);
2959 rtnl_unlock();
2960 return err;
2961 }
2962
2963 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2964 int plen, int scope)
2965 {
2966 struct inet6_ifaddr *ifp;
2967
2968 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2969 scope, IFA_F_PERMANENT,
2970 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2971 if (!IS_ERR(ifp)) {
2972 spin_lock_bh(&ifp->lock);
2973 ifp->flags &= ~IFA_F_TENTATIVE;
2974 spin_unlock_bh(&ifp->lock);
2975 rt_genid_bump_ipv6(dev_net(idev->dev));
2976 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2977 in6_ifa_put(ifp);
2978 }
2979 }
2980
2981 #if IS_ENABLED(CONFIG_IPV6_SIT)
2982 static void sit_add_v4_addrs(struct inet6_dev *idev)
2983 {
2984 struct in6_addr addr;
2985 struct net_device *dev;
2986 struct net *net = dev_net(idev->dev);
2987 int scope, plen;
2988 u32 pflags = 0;
2989
2990 ASSERT_RTNL();
2991
2992 memset(&addr, 0, sizeof(struct in6_addr));
2993 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2994
2995 if (idev->dev->flags&IFF_POINTOPOINT) {
2996 addr.s6_addr32[0] = htonl(0xfe800000);
2997 scope = IFA_LINK;
2998 plen = 64;
2999 } else {
3000 scope = IPV6_ADDR_COMPATv4;
3001 plen = 96;
3002 pflags |= RTF_NONEXTHOP;
3003 }
3004
3005 if (addr.s6_addr32[3]) {
3006 add_addr(idev, &addr, plen, scope);
3007 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
3008 return;
3009 }
3010
3011 for_each_netdev(net, dev) {
3012 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3013 if (in_dev && (dev->flags & IFF_UP)) {
3014 struct in_ifaddr *ifa;
3015
3016 int flag = scope;
3017
3018 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
3019
3020 addr.s6_addr32[3] = ifa->ifa_local;
3021
3022 if (ifa->ifa_scope == RT_SCOPE_LINK)
3023 continue;
3024 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3025 if (idev->dev->flags&IFF_POINTOPOINT)
3026 continue;
3027 flag |= IFA_HOST;
3028 }
3029
3030 add_addr(idev, &addr, plen, flag);
3031 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3032 pflags);
3033 }
3034 }
3035 }
3036 }
3037 #endif
3038
3039 static void init_loopback(struct net_device *dev)
3040 {
3041 struct inet6_dev *idev;
3042
3043 /* ::1 */
3044
3045 ASSERT_RTNL();
3046
3047 idev = ipv6_find_idev(dev);
3048 if (!idev) {
3049 pr_debug("%s: add_dev failed\n", __func__);
3050 return;
3051 }
3052
3053 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3054 }
3055
3056 void addrconf_add_linklocal(struct inet6_dev *idev,
3057 const struct in6_addr *addr, u32 flags)
3058 {
3059 struct inet6_ifaddr *ifp;
3060 u32 addr_flags = flags | IFA_F_PERMANENT;
3061
3062 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3063 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3064 idev->cnf.optimistic_dad) &&
3065 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3066 addr_flags |= IFA_F_OPTIMISTIC;
3067 #endif
3068
3069 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3070 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3071 if (!IS_ERR(ifp)) {
3072 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3073 addrconf_dad_start(ifp);
3074 in6_ifa_put(ifp);
3075 }
3076 }
3077 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3078
3079 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3080 {
3081 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3082 return true;
3083
3084 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3085 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3086 return true;
3087
3088 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3089 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3090 return true;
3091
3092 return false;
3093 }
3094
3095 static int ipv6_generate_stable_address(struct in6_addr *address,
3096 u8 dad_count,
3097 const struct inet6_dev *idev)
3098 {
3099 static DEFINE_SPINLOCK(lock);
3100 static __u32 digest[SHA_DIGEST_WORDS];
3101 static __u32 workspace[SHA_WORKSPACE_WORDS];
3102
3103 static union {
3104 char __data[SHA_MESSAGE_BYTES];
3105 struct {
3106 struct in6_addr secret;
3107 __be32 prefix[2];
3108 unsigned char hwaddr[MAX_ADDR_LEN];
3109 u8 dad_count;
3110 } __packed;
3111 } data;
3112
3113 struct in6_addr secret;
3114 struct in6_addr temp;
3115 struct net *net = dev_net(idev->dev);
3116
3117 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3118
3119 if (idev->cnf.stable_secret.initialized)
3120 secret = idev->cnf.stable_secret.secret;
3121 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3122 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3123 else
3124 return -1;
3125
3126 retry:
3127 spin_lock_bh(&lock);
3128
3129 sha_init(digest);
3130 memset(&data, 0, sizeof(data));
3131 memset(workspace, 0, sizeof(workspace));
3132 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3133 data.prefix[0] = address->s6_addr32[0];
3134 data.prefix[1] = address->s6_addr32[1];
3135 data.secret = secret;
3136 data.dad_count = dad_count;
3137
3138 sha_transform(digest, data.__data, workspace);
3139
3140 temp = *address;
3141 temp.s6_addr32[2] = (__force __be32)digest[0];
3142 temp.s6_addr32[3] = (__force __be32)digest[1];
3143
3144 spin_unlock_bh(&lock);
3145
3146 if (ipv6_reserved_interfaceid(temp)) {
3147 dad_count++;
3148 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3149 return -1;
3150 goto retry;
3151 }
3152
3153 *address = temp;
3154 return 0;
3155 }
3156
3157 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3158 {
3159 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3160
3161 if (s->initialized)
3162 return;
3163 s = &idev->cnf.stable_secret;
3164 get_random_bytes(&s->secret, sizeof(s->secret));
3165 s->initialized = true;
3166 }
3167
3168 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3169 {
3170 struct in6_addr addr;
3171
3172 /* no link local addresses on L3 master devices */
3173 if (netif_is_l3_master(idev->dev))
3174 return;
3175
3176 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3177
3178 switch (idev->cnf.addr_gen_mode) {
3179 case IN6_ADDR_GEN_MODE_RANDOM:
3180 ipv6_gen_mode_random_init(idev);
3181 /* fallthrough */
3182 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3183 if (!ipv6_generate_stable_address(&addr, 0, idev))
3184 addrconf_add_linklocal(idev, &addr,
3185 IFA_F_STABLE_PRIVACY);
3186 else if (prefix_route)
3187 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3188 break;
3189 case IN6_ADDR_GEN_MODE_EUI64:
3190 /* addrconf_add_linklocal also adds a prefix_route and we
3191 * only need to care about prefix routes if ipv6_generate_eui64
3192 * couldn't generate one.
3193 */
3194 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3195 addrconf_add_linklocal(idev, &addr, 0);
3196 else if (prefix_route)
3197 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3198 break;
3199 case IN6_ADDR_GEN_MODE_NONE:
3200 default:
3201 /* will not add any link local address */
3202 break;
3203 }
3204 }
3205
3206 static void addrconf_dev_config(struct net_device *dev)
3207 {
3208 struct inet6_dev *idev;
3209
3210 ASSERT_RTNL();
3211
3212 if ((dev->type != ARPHRD_ETHER) &&
3213 (dev->type != ARPHRD_FDDI) &&
3214 (dev->type != ARPHRD_ARCNET) &&
3215 (dev->type != ARPHRD_INFINIBAND) &&
3216 (dev->type != ARPHRD_IEEE1394) &&
3217 (dev->type != ARPHRD_TUNNEL6) &&
3218 (dev->type != ARPHRD_6LOWPAN) &&
3219 (dev->type != ARPHRD_IP6GRE) &&
3220 (dev->type != ARPHRD_IPGRE) &&
3221 (dev->type != ARPHRD_TUNNEL) &&
3222 (dev->type != ARPHRD_NONE)) {
3223 /* Alas, we support only Ethernet autoconfiguration. */
3224 return;
3225 }
3226
3227 idev = addrconf_add_dev(dev);
3228 if (IS_ERR(idev))
3229 return;
3230
3231 /* this device type has no EUI support */
3232 if (dev->type == ARPHRD_NONE &&
3233 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3234 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3235
3236 addrconf_addr_gen(idev, false);
3237 }
3238
3239 #if IS_ENABLED(CONFIG_IPV6_SIT)
3240 static void addrconf_sit_config(struct net_device *dev)
3241 {
3242 struct inet6_dev *idev;
3243
3244 ASSERT_RTNL();
3245
3246 /*
3247 * Configure the tunnel with one of our IPv4
3248 * addresses... we should configure all of
3249 * our v4 addrs in the tunnel
3250 */
3251
3252 idev = ipv6_find_idev(dev);
3253 if (!idev) {
3254 pr_debug("%s: add_dev failed\n", __func__);
3255 return;
3256 }
3257
3258 if (dev->priv_flags & IFF_ISATAP) {
3259 addrconf_addr_gen(idev, false);
3260 return;
3261 }
3262
3263 sit_add_v4_addrs(idev);
3264
3265 if (dev->flags&IFF_POINTOPOINT)
3266 addrconf_add_mroute(dev);
3267 }
3268 #endif
3269
3270 #if IS_ENABLED(CONFIG_NET_IPGRE)
3271 static void addrconf_gre_config(struct net_device *dev)
3272 {
3273 struct inet6_dev *idev;
3274
3275 ASSERT_RTNL();
3276
3277 idev = ipv6_find_idev(dev);
3278 if (!idev) {
3279 pr_debug("%s: add_dev failed\n", __func__);
3280 return;
3281 }
3282
3283 addrconf_addr_gen(idev, true);
3284 if (dev->flags & IFF_POINTOPOINT)
3285 addrconf_add_mroute(dev);
3286 }
3287 #endif
3288
3289 static int fixup_permanent_addr(struct inet6_dev *idev,
3290 struct inet6_ifaddr *ifp)
3291 {
3292 /* !rt6i_node means the host route was removed from the
3293 * FIB, for example, if 'lo' device is taken down. In that
3294 * case regenerate the host route.
3295 */
3296 if (!ifp->rt || !ifp->rt->rt6i_node) {
3297 struct rt6_info *rt, *prev;
3298
3299 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3300 if (unlikely(IS_ERR(rt)))
3301 return PTR_ERR(rt);
3302
3303 /* ifp->rt can be accessed outside of rtnl */
3304 spin_lock(&ifp->lock);
3305 prev = ifp->rt;
3306 ifp->rt = rt;
3307 spin_unlock(&ifp->lock);
3308
3309 ip6_rt_put(prev);
3310 }
3311
3312 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3313 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3314 idev->dev, 0, 0);
3315 }
3316
3317 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3318 addrconf_dad_start(ifp);
3319
3320 return 0;
3321 }
3322
3323 static void addrconf_permanent_addr(struct net_device *dev)
3324 {
3325 struct inet6_ifaddr *ifp, *tmp;
3326 struct inet6_dev *idev;
3327
3328 idev = __in6_dev_get(dev);
3329 if (!idev)
3330 return;
3331
3332 write_lock_bh(&idev->lock);
3333
3334 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3335 if ((ifp->flags & IFA_F_PERMANENT) &&
3336 fixup_permanent_addr(idev, ifp) < 0) {
3337 write_unlock_bh(&idev->lock);
3338 ipv6_del_addr(ifp);
3339 write_lock_bh(&idev->lock);
3340
3341 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3342 idev->dev->name, &ifp->addr);
3343 }
3344 }
3345
3346 write_unlock_bh(&idev->lock);
3347 }
3348
3349 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3350 void *ptr)
3351 {
3352 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3353 struct netdev_notifier_changeupper_info *info;
3354 struct inet6_dev *idev = __in6_dev_get(dev);
3355 struct net *net = dev_net(dev);
3356 int run_pending = 0;
3357 int err;
3358
3359 switch (event) {
3360 case NETDEV_REGISTER:
3361 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3362 idev = ipv6_add_dev(dev);
3363 if (IS_ERR(idev))
3364 return notifier_from_errno(PTR_ERR(idev));
3365 }
3366 break;
3367
3368 case NETDEV_CHANGEMTU:
3369 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3370 if (dev->mtu < IPV6_MIN_MTU) {
3371 addrconf_ifdown(dev, dev != net->loopback_dev);
3372 break;
3373 }
3374
3375 if (idev) {
3376 rt6_mtu_change(dev, dev->mtu);
3377 idev->cnf.mtu6 = dev->mtu;
3378 break;
3379 }
3380
3381 /* allocate new idev */
3382 idev = ipv6_add_dev(dev);
3383 if (IS_ERR(idev))
3384 break;
3385
3386 /* device is still not ready */
3387 if (!(idev->if_flags & IF_READY))
3388 break;
3389
3390 run_pending = 1;
3391
3392 /* fall through */
3393
3394 case NETDEV_UP:
3395 case NETDEV_CHANGE:
3396 if (dev->flags & IFF_SLAVE)
3397 break;
3398
3399 if (idev && idev->cnf.disable_ipv6)
3400 break;
3401
3402 if (event == NETDEV_UP) {
3403 /* restore routes for permanent addresses */
3404 addrconf_permanent_addr(dev);
3405
3406 if (!addrconf_qdisc_ok(dev)) {
3407 /* device is not ready yet. */
3408 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3409 dev->name);
3410 break;
3411 }
3412
3413 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3414 idev = ipv6_add_dev(dev);
3415
3416 if (!IS_ERR_OR_NULL(idev)) {
3417 idev->if_flags |= IF_READY;
3418 run_pending = 1;
3419 }
3420 } else if (event == NETDEV_CHANGE) {
3421 if (!addrconf_qdisc_ok(dev)) {
3422 /* device is still not ready. */
3423 break;
3424 }
3425
3426 if (idev) {
3427 if (idev->if_flags & IF_READY) {
3428 /* device is already configured -
3429 * but resend MLD reports, we might
3430 * have roamed and need to update
3431 * multicast snooping switches
3432 */
3433 ipv6_mc_up(idev);
3434 break;
3435 }
3436 idev->if_flags |= IF_READY;
3437 }
3438
3439 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3440 dev->name);
3441
3442 run_pending = 1;
3443 }
3444
3445 switch (dev->type) {
3446 #if IS_ENABLED(CONFIG_IPV6_SIT)
3447 case ARPHRD_SIT:
3448 addrconf_sit_config(dev);
3449 break;
3450 #endif
3451 #if IS_ENABLED(CONFIG_NET_IPGRE)
3452 case ARPHRD_IPGRE:
3453 addrconf_gre_config(dev);
3454 break;
3455 #endif
3456 case ARPHRD_LOOPBACK:
3457 init_loopback(dev);
3458 break;
3459
3460 default:
3461 addrconf_dev_config(dev);
3462 break;
3463 }
3464
3465 if (!IS_ERR_OR_NULL(idev)) {
3466 if (run_pending)
3467 addrconf_dad_run(idev);
3468
3469 /*
3470 * If the MTU changed during the interface down,
3471 * when the interface up, the changed MTU must be
3472 * reflected in the idev as well as routers.
3473 */
3474 if (idev->cnf.mtu6 != dev->mtu &&
3475 dev->mtu >= IPV6_MIN_MTU) {
3476 rt6_mtu_change(dev, dev->mtu);
3477 idev->cnf.mtu6 = dev->mtu;
3478 }
3479 idev->tstamp = jiffies;
3480 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3481
3482 /*
3483 * If the changed mtu during down is lower than
3484 * IPV6_MIN_MTU stop IPv6 on this interface.
3485 */
3486 if (dev->mtu < IPV6_MIN_MTU)
3487 addrconf_ifdown(dev, dev != net->loopback_dev);
3488 }
3489 break;
3490
3491 case NETDEV_DOWN:
3492 case NETDEV_UNREGISTER:
3493 /*
3494 * Remove all addresses from this interface.
3495 */
3496 addrconf_ifdown(dev, event != NETDEV_DOWN);
3497 break;
3498
3499 case NETDEV_CHANGENAME:
3500 if (idev) {
3501 snmp6_unregister_dev(idev);
3502 addrconf_sysctl_unregister(idev);
3503 err = addrconf_sysctl_register(idev);
3504 if (err)
3505 return notifier_from_errno(err);
3506 err = snmp6_register_dev(idev);
3507 if (err) {
3508 addrconf_sysctl_unregister(idev);
3509 return notifier_from_errno(err);
3510 }
3511 }
3512 break;
3513
3514 case NETDEV_PRE_TYPE_CHANGE:
3515 case NETDEV_POST_TYPE_CHANGE:
3516 if (idev)
3517 addrconf_type_change(dev, event);
3518 break;
3519
3520 case NETDEV_CHANGEUPPER:
3521 info = ptr;
3522
3523 /* flush all routes if dev is linked to or unlinked from
3524 * an L3 master device (e.g., VRF)
3525 */
3526 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3527 addrconf_ifdown(dev, 0);
3528 }
3529
3530 return NOTIFY_OK;
3531 }
3532
3533 /*
3534 * addrconf module should be notified of a device going up
3535 */
3536 static struct notifier_block ipv6_dev_notf = {
3537 .notifier_call = addrconf_notify,
3538 .priority = ADDRCONF_NOTIFY_PRIORITY,
3539 };
3540
3541 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3542 {
3543 struct inet6_dev *idev;
3544 ASSERT_RTNL();
3545
3546 idev = __in6_dev_get(dev);
3547
3548 if (event == NETDEV_POST_TYPE_CHANGE)
3549 ipv6_mc_remap(idev);
3550 else if (event == NETDEV_PRE_TYPE_CHANGE)
3551 ipv6_mc_unmap(idev);
3552 }
3553
3554 static bool addr_is_local(const struct in6_addr *addr)
3555 {
3556 return ipv6_addr_type(addr) &
3557 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3558 }
3559
3560 static int addrconf_ifdown(struct net_device *dev, int how)
3561 {
3562 struct net *net = dev_net(dev);
3563 struct inet6_dev *idev;
3564 struct inet6_ifaddr *ifa, *tmp;
3565 struct list_head del_list;
3566 int _keep_addr;
3567 bool keep_addr;
3568 int state, i;
3569
3570 ASSERT_RTNL();
3571
3572 rt6_ifdown(net, dev);
3573 neigh_ifdown(&nd_tbl, dev);
3574
3575 idev = __in6_dev_get(dev);
3576 if (!idev)
3577 return -ENODEV;
3578
3579 /*
3580 * Step 1: remove reference to ipv6 device from parent device.
3581 * Do not dev_put!
3582 */
3583 if (how) {
3584 idev->dead = 1;
3585
3586 /* protected by rtnl_lock */
3587 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3588
3589 /* Step 1.5: remove snmp6 entry */
3590 snmp6_unregister_dev(idev);
3591
3592 }
3593
3594 /* aggregate the system setting and interface setting */
3595 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3596 if (!_keep_addr)
3597 _keep_addr = idev->cnf.keep_addr_on_down;
3598
3599 /* combine the user config with event to determine if permanent
3600 * addresses are to be removed from address hash table
3601 */
3602 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3603
3604 /* Step 2: clear hash table */
3605 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3606 struct hlist_head *h = &inet6_addr_lst[i];
3607
3608 spin_lock_bh(&addrconf_hash_lock);
3609 restart:
3610 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3611 if (ifa->idev == idev) {
3612 addrconf_del_dad_work(ifa);
3613 /* combined flag + permanent flag decide if
3614 * address is retained on a down event
3615 */
3616 if (!keep_addr ||
3617 !(ifa->flags & IFA_F_PERMANENT) ||
3618 addr_is_local(&ifa->addr)) {
3619 hlist_del_init_rcu(&ifa->addr_lst);
3620 goto restart;
3621 }
3622 }
3623 }
3624 spin_unlock_bh(&addrconf_hash_lock);
3625 }
3626
3627 write_lock_bh(&idev->lock);
3628
3629 addrconf_del_rs_timer(idev);
3630
3631 /* Step 2: clear flags for stateless addrconf */
3632 if (!how)
3633 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3634
3635 /* Step 3: clear tempaddr list */
3636 while (!list_empty(&idev->tempaddr_list)) {
3637 ifa = list_first_entry(&idev->tempaddr_list,
3638 struct inet6_ifaddr, tmp_list);
3639 list_del(&ifa->tmp_list);
3640 write_unlock_bh(&idev->lock);
3641 spin_lock_bh(&ifa->lock);
3642
3643 if (ifa->ifpub) {
3644 in6_ifa_put(ifa->ifpub);
3645 ifa->ifpub = NULL;
3646 }
3647 spin_unlock_bh(&ifa->lock);
3648 in6_ifa_put(ifa);
3649 write_lock_bh(&idev->lock);
3650 }
3651
3652 /* re-combine the user config with event to determine if permanent
3653 * addresses are to be removed from the interface list
3654 */
3655 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3656
3657 INIT_LIST_HEAD(&del_list);
3658 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3659 struct rt6_info *rt = NULL;
3660 bool keep;
3661
3662 addrconf_del_dad_work(ifa);
3663
3664 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3665 !addr_is_local(&ifa->addr);
3666 if (!keep)
3667 list_move(&ifa->if_list, &del_list);
3668
3669 write_unlock_bh(&idev->lock);
3670 spin_lock_bh(&ifa->lock);
3671
3672 if (keep) {
3673 /* set state to skip the notifier below */
3674 state = INET6_IFADDR_STATE_DEAD;
3675 ifa->state = INET6_IFADDR_STATE_PREDAD;
3676 if (!(ifa->flags & IFA_F_NODAD))
3677 ifa->flags |= IFA_F_TENTATIVE;
3678
3679 rt = ifa->rt;
3680 ifa->rt = NULL;
3681 } else {
3682 state = ifa->state;
3683 ifa->state = INET6_IFADDR_STATE_DEAD;
3684 }
3685
3686 spin_unlock_bh(&ifa->lock);
3687
3688 if (rt)
3689 ip6_del_rt(rt);
3690
3691 if (state != INET6_IFADDR_STATE_DEAD) {
3692 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3693 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3694 } else {
3695 if (idev->cnf.forwarding)
3696 addrconf_leave_anycast(ifa);
3697 addrconf_leave_solict(ifa->idev, &ifa->addr);
3698 }
3699
3700 write_lock_bh(&idev->lock);
3701 }
3702
3703 write_unlock_bh(&idev->lock);
3704
3705 /* now clean up addresses to be removed */
3706 while (!list_empty(&del_list)) {
3707 ifa = list_first_entry(&del_list,
3708 struct inet6_ifaddr, if_list);
3709 list_del(&ifa->if_list);
3710
3711 in6_ifa_put(ifa);
3712 }
3713
3714 /* Step 5: Discard anycast and multicast list */
3715 if (how) {
3716 ipv6_ac_destroy_dev(idev);
3717 ipv6_mc_destroy_dev(idev);
3718 } else {
3719 ipv6_mc_down(idev);
3720 }
3721
3722 idev->tstamp = jiffies;
3723
3724 /* Last: Shot the device (if unregistered) */
3725 if (how) {
3726 addrconf_sysctl_unregister(idev);
3727 neigh_parms_release(&nd_tbl, idev->nd_parms);
3728 neigh_ifdown(&nd_tbl, dev);
3729 in6_dev_put(idev);
3730 }
3731 return 0;
3732 }
3733
3734 static void addrconf_rs_timer(unsigned long data)
3735 {
3736 struct inet6_dev *idev = (struct inet6_dev *)data;
3737 struct net_device *dev = idev->dev;
3738 struct in6_addr lladdr;
3739
3740 write_lock(&idev->lock);
3741 if (idev->dead || !(idev->if_flags & IF_READY))
3742 goto out;
3743
3744 if (!ipv6_accept_ra(idev))
3745 goto out;
3746
3747 /* Announcement received after solicitation was sent */
3748 if (idev->if_flags & IF_RA_RCVD)
3749 goto out;
3750
3751 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3752 write_unlock(&idev->lock);
3753 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3754 ndisc_send_rs(dev, &lladdr,
3755 &in6addr_linklocal_allrouters);
3756 else
3757 goto put;
3758
3759 write_lock(&idev->lock);
3760 idev->rs_interval = rfc3315_s14_backoff_update(
3761 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3762 /* The wait after the last probe can be shorter */
3763 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3764 idev->cnf.rtr_solicits) ?
3765 idev->cnf.rtr_solicit_delay :
3766 idev->rs_interval);
3767 } else {
3768 /*
3769 * Note: we do not support deprecated "all on-link"
3770 * assumption any longer.
3771 */
3772 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3773 }
3774
3775 out:
3776 write_unlock(&idev->lock);
3777 put:
3778 in6_dev_put(idev);
3779 }
3780
3781 /*
3782 * Duplicate Address Detection
3783 */
3784 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3785 {
3786 unsigned long rand_num;
3787 struct inet6_dev *idev = ifp->idev;
3788 u64 nonce;
3789
3790 if (ifp->flags & IFA_F_OPTIMISTIC)
3791 rand_num = 0;
3792 else
3793 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3794
3795 nonce = 0;
3796 if (idev->cnf.enhanced_dad ||
3797 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3798 do
3799 get_random_bytes(&nonce, 6);
3800 while (nonce == 0);
3801 }
3802 ifp->dad_nonce = nonce;
3803 ifp->dad_probes = idev->cnf.dad_transmits;
3804 addrconf_mod_dad_work(ifp, rand_num);
3805 }
3806
3807 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3808 {
3809 struct inet6_dev *idev = ifp->idev;
3810 struct net_device *dev = idev->dev;
3811 bool bump_id, notify = false;
3812
3813 addrconf_join_solict(dev, &ifp->addr);
3814
3815 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3816
3817 read_lock_bh(&idev->lock);
3818 spin_lock(&ifp->lock);
3819 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3820 goto out;
3821
3822 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3823 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 &&
3824 idev->cnf.accept_dad < 1) ||
3825 !(ifp->flags&IFA_F_TENTATIVE) ||
3826 ifp->flags & IFA_F_NODAD) {
3827 bump_id = ifp->flags & IFA_F_TENTATIVE;
3828 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3829 spin_unlock(&ifp->lock);
3830 read_unlock_bh(&idev->lock);
3831
3832 addrconf_dad_completed(ifp, bump_id);
3833 return;
3834 }
3835
3836 if (!(idev->if_flags & IF_READY)) {
3837 spin_unlock(&ifp->lock);
3838 read_unlock_bh(&idev->lock);
3839 /*
3840 * If the device is not ready:
3841 * - keep it tentative if it is a permanent address.
3842 * - otherwise, kill it.
3843 */
3844 in6_ifa_hold(ifp);
3845 addrconf_dad_stop(ifp, 0);
3846 return;
3847 }
3848
3849 /*
3850 * Optimistic nodes can start receiving
3851 * Frames right away
3852 */
3853 if (ifp->flags & IFA_F_OPTIMISTIC) {
3854 ip6_ins_rt(ifp->rt);
3855 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) {
3856 /* Because optimistic nodes can use this address,
3857 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3858 */
3859 notify = true;
3860 }
3861 }
3862
3863 addrconf_dad_kick(ifp);
3864 out:
3865 spin_unlock(&ifp->lock);
3866 read_unlock_bh(&idev->lock);
3867 if (notify)
3868 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3869 }
3870
3871 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3872 {
3873 bool begin_dad = false;
3874
3875 spin_lock_bh(&ifp->lock);
3876 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3877 ifp->state = INET6_IFADDR_STATE_PREDAD;
3878 begin_dad = true;
3879 }
3880 spin_unlock_bh(&ifp->lock);
3881
3882 if (begin_dad)
3883 addrconf_mod_dad_work(ifp, 0);
3884 }
3885
3886 static void addrconf_dad_work(struct work_struct *w)
3887 {
3888 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3889 struct inet6_ifaddr,
3890 dad_work);
3891 struct inet6_dev *idev = ifp->idev;
3892 bool bump_id, disable_ipv6 = false;
3893 struct in6_addr mcaddr;
3894
3895 enum {
3896 DAD_PROCESS,
3897 DAD_BEGIN,
3898 DAD_ABORT,
3899 } action = DAD_PROCESS;
3900
3901 rtnl_lock();
3902
3903 spin_lock_bh(&ifp->lock);
3904 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3905 action = DAD_BEGIN;
3906 ifp->state = INET6_IFADDR_STATE_DAD;
3907 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3908 action = DAD_ABORT;
3909 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3910
3911 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3912 idev->cnf.accept_dad > 1) &&
3913 !idev->cnf.disable_ipv6 &&
3914 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3915 struct in6_addr addr;
3916
3917 addr.s6_addr32[0] = htonl(0xfe800000);
3918 addr.s6_addr32[1] = 0;
3919
3920 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3921 ipv6_addr_equal(&ifp->addr, &addr)) {
3922 /* DAD failed for link-local based on MAC */
3923 idev->cnf.disable_ipv6 = 1;
3924
3925 pr_info("%s: IPv6 being disabled!\n",
3926 ifp->idev->dev->name);
3927 disable_ipv6 = true;
3928 }
3929 }
3930 }
3931 spin_unlock_bh(&ifp->lock);
3932
3933 if (action == DAD_BEGIN) {
3934 addrconf_dad_begin(ifp);
3935 goto out;
3936 } else if (action == DAD_ABORT) {
3937 in6_ifa_hold(ifp);
3938 addrconf_dad_stop(ifp, 1);
3939 if (disable_ipv6)
3940 addrconf_ifdown(idev->dev, 0);
3941 goto out;
3942 }
3943
3944 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3945 goto out;
3946
3947 write_lock_bh(&idev->lock);
3948 if (idev->dead || !(idev->if_flags & IF_READY)) {
3949 write_unlock_bh(&idev->lock);
3950 goto out;
3951 }
3952
3953 spin_lock(&ifp->lock);
3954 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3955 spin_unlock(&ifp->lock);
3956 write_unlock_bh(&idev->lock);
3957 goto out;
3958 }
3959
3960 if (ifp->dad_probes == 0) {
3961 /*
3962 * DAD was successful
3963 */
3964
3965 bump_id = ifp->flags & IFA_F_TENTATIVE;
3966 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3967 spin_unlock(&ifp->lock);
3968 write_unlock_bh(&idev->lock);
3969
3970 addrconf_dad_completed(ifp, bump_id);
3971
3972 goto out;
3973 }
3974
3975 ifp->dad_probes--;
3976 addrconf_mod_dad_work(ifp,
3977 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3978 spin_unlock(&ifp->lock);
3979 write_unlock_bh(&idev->lock);
3980
3981 /* send a neighbour solicitation for our addr */
3982 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3983 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3984 ifp->dad_nonce);
3985 out:
3986 in6_ifa_put(ifp);
3987 rtnl_unlock();
3988 }
3989
3990 /* ifp->idev must be at least read locked */
3991 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3992 {
3993 struct inet6_ifaddr *ifpiter;
3994 struct inet6_dev *idev = ifp->idev;
3995
3996 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3997 if (ifpiter->scope > IFA_LINK)
3998 break;
3999 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4000 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4001 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4002 IFA_F_PERMANENT)
4003 return false;
4004 }
4005 return true;
4006 }
4007
4008 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
4009 {
4010 struct net_device *dev = ifp->idev->dev;
4011 struct in6_addr lladdr;
4012 bool send_rs, send_mld;
4013
4014 addrconf_del_dad_work(ifp);
4015
4016 /*
4017 * Configure the address for reception. Now it is valid.
4018 */
4019
4020 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4021
4022 /* If added prefix is link local and we are prepared to process
4023 router advertisements, start sending router solicitations.
4024 */
4025
4026 read_lock_bh(&ifp->idev->lock);
4027 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4028 send_rs = send_mld &&
4029 ipv6_accept_ra(ifp->idev) &&
4030 ifp->idev->cnf.rtr_solicits != 0 &&
4031 (dev->flags&IFF_LOOPBACK) == 0;
4032 read_unlock_bh(&ifp->idev->lock);
4033
4034 /* While dad is in progress mld report's source address is in6_addrany.
4035 * Resend with proper ll now.
4036 */
4037 if (send_mld)
4038 ipv6_mc_dad_complete(ifp->idev);
4039
4040 if (send_rs) {
4041 /*
4042 * If a host as already performed a random delay
4043 * [...] as part of DAD [...] there is no need
4044 * to delay again before sending the first RS
4045 */
4046 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4047 return;
4048 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4049
4050 write_lock_bh(&ifp->idev->lock);
4051 spin_lock(&ifp->lock);
4052 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4053 ifp->idev->cnf.rtr_solicit_interval);
4054 ifp->idev->rs_probes = 1;
4055 ifp->idev->if_flags |= IF_RS_SENT;
4056 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4057 spin_unlock(&ifp->lock);
4058 write_unlock_bh(&ifp->idev->lock);
4059 }
4060
4061 if (bump_id)
4062 rt_genid_bump_ipv6(dev_net(dev));
4063
4064 /* Make sure that a new temporary address will be created
4065 * before this temporary address becomes deprecated.
4066 */
4067 if (ifp->flags & IFA_F_TEMPORARY)
4068 addrconf_verify_rtnl();
4069 }
4070
4071 static void addrconf_dad_run(struct inet6_dev *idev)
4072 {
4073 struct inet6_ifaddr *ifp;
4074
4075 read_lock_bh(&idev->lock);
4076 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4077 spin_lock(&ifp->lock);
4078 if (ifp->flags & IFA_F_TENTATIVE &&
4079 ifp->state == INET6_IFADDR_STATE_DAD)
4080 addrconf_dad_kick(ifp);
4081 spin_unlock(&ifp->lock);
4082 }
4083 read_unlock_bh(&idev->lock);
4084 }
4085
4086 #ifdef CONFIG_PROC_FS
4087 struct if6_iter_state {
4088 struct seq_net_private p;
4089 int bucket;
4090 int offset;
4091 };
4092
4093 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4094 {
4095 struct inet6_ifaddr *ifa = NULL;
4096 struct if6_iter_state *state = seq->private;
4097 struct net *net = seq_file_net(seq);
4098 int p = 0;
4099
4100 /* initial bucket if pos is 0 */
4101 if (pos == 0) {
4102 state->bucket = 0;
4103 state->offset = 0;
4104 }
4105
4106 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4107 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4108 addr_lst) {
4109 if (!net_eq(dev_net(ifa->idev->dev), net))
4110 continue;
4111 /* sync with offset */
4112 if (p < state->offset) {
4113 p++;
4114 continue;
4115 }
4116 state->offset++;
4117 return ifa;
4118 }
4119
4120 /* prepare for next bucket */
4121 state->offset = 0;
4122 p = 0;
4123 }
4124 return NULL;
4125 }
4126
4127 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4128 struct inet6_ifaddr *ifa)
4129 {
4130 struct if6_iter_state *state = seq->private;
4131 struct net *net = seq_file_net(seq);
4132
4133 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4134 if (!net_eq(dev_net(ifa->idev->dev), net))
4135 continue;
4136 state->offset++;
4137 return ifa;
4138 }
4139
4140 while (++state->bucket < IN6_ADDR_HSIZE) {
4141 state->offset = 0;
4142 hlist_for_each_entry_rcu_bh(ifa,
4143 &inet6_addr_lst[state->bucket], addr_lst) {
4144 if (!net_eq(dev_net(ifa->idev->dev), net))
4145 continue;
4146 state->offset++;
4147 return ifa;
4148 }
4149 }
4150
4151 return NULL;
4152 }
4153
4154 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4155 __acquires(rcu_bh)
4156 {
4157 rcu_read_lock_bh();
4158 return if6_get_first(seq, *pos);
4159 }
4160
4161 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4162 {
4163 struct inet6_ifaddr *ifa;
4164
4165 ifa = if6_get_next(seq, v);
4166 ++*pos;
4167 return ifa;
4168 }
4169
4170 static void if6_seq_stop(struct seq_file *seq, void *v)
4171 __releases(rcu_bh)
4172 {
4173 rcu_read_unlock_bh();
4174 }
4175
4176 static int if6_seq_show(struct seq_file *seq, void *v)
4177 {
4178 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4179 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4180 &ifp->addr,
4181 ifp->idev->dev->ifindex,
4182 ifp->prefix_len,
4183 ifp->scope,
4184 (u8) ifp->flags,
4185 ifp->idev->dev->name);
4186 return 0;
4187 }
4188
4189 static const struct seq_operations if6_seq_ops = {
4190 .start = if6_seq_start,
4191 .next = if6_seq_next,
4192 .show = if6_seq_show,
4193 .stop = if6_seq_stop,
4194 };
4195
4196 static int if6_seq_open(struct inode *inode, struct file *file)
4197 {
4198 return seq_open_net(inode, file, &if6_seq_ops,
4199 sizeof(struct if6_iter_state));
4200 }
4201
4202 static const struct file_operations if6_fops = {
4203 .owner = THIS_MODULE,
4204 .open = if6_seq_open,
4205 .read = seq_read,
4206 .llseek = seq_lseek,
4207 .release = seq_release_net,
4208 };
4209
4210 static int __net_init if6_proc_net_init(struct net *net)
4211 {
4212 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4213 return -ENOMEM;
4214 return 0;
4215 }
4216
4217 static void __net_exit if6_proc_net_exit(struct net *net)
4218 {
4219 remove_proc_entry("if_inet6", net->proc_net);
4220 }
4221
4222 static struct pernet_operations if6_proc_net_ops = {
4223 .init = if6_proc_net_init,
4224 .exit = if6_proc_net_exit,
4225 };
4226
4227 int __init if6_proc_init(void)
4228 {
4229 return register_pernet_subsys(&if6_proc_net_ops);
4230 }
4231
4232 void if6_proc_exit(void)
4233 {
4234 unregister_pernet_subsys(&if6_proc_net_ops);
4235 }
4236 #endif /* CONFIG_PROC_FS */
4237
4238 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4239 /* Check if address is a home address configured on any interface. */
4240 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4241 {
4242 int ret = 0;
4243 struct inet6_ifaddr *ifp = NULL;
4244 unsigned int hash = inet6_addr_hash(addr);
4245
4246 rcu_read_lock_bh();
4247 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4248 if (!net_eq(dev_net(ifp->idev->dev), net))
4249 continue;
4250 if (ipv6_addr_equal(&ifp->addr, addr) &&
4251 (ifp->flags & IFA_F_HOMEADDRESS)) {
4252 ret = 1;
4253 break;
4254 }
4255 }
4256 rcu_read_unlock_bh();
4257 return ret;
4258 }
4259 #endif
4260
4261 /*
4262 * Periodic address status verification
4263 */
4264
4265 static void addrconf_verify_rtnl(void)
4266 {
4267 unsigned long now, next, next_sec, next_sched;
4268 struct inet6_ifaddr *ifp;
4269 int i;
4270
4271 ASSERT_RTNL();
4272
4273 rcu_read_lock_bh();
4274 now = jiffies;
4275 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4276
4277 cancel_delayed_work(&addr_chk_work);
4278
4279 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4280 restart:
4281 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4282 unsigned long age;
4283
4284 /* When setting preferred_lft to a value not zero or
4285 * infinity, while valid_lft is infinity
4286 * IFA_F_PERMANENT has a non-infinity life time.
4287 */
4288 if ((ifp->flags & IFA_F_PERMANENT) &&
4289 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4290 continue;
4291
4292 spin_lock(&ifp->lock);
4293 /* We try to batch several events at once. */
4294 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4295
4296 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4297 age >= ifp->valid_lft) {
4298 spin_unlock(&ifp->lock);
4299 in6_ifa_hold(ifp);
4300 ipv6_del_addr(ifp);
4301 goto restart;
4302 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4303 spin_unlock(&ifp->lock);
4304 continue;
4305 } else if (age >= ifp->prefered_lft) {
4306 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4307 int deprecate = 0;
4308
4309 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4310 deprecate = 1;
4311 ifp->flags |= IFA_F_DEPRECATED;
4312 }
4313
4314 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4315 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4316 next = ifp->tstamp + ifp->valid_lft * HZ;
4317
4318 spin_unlock(&ifp->lock);
4319
4320 if (deprecate) {
4321 in6_ifa_hold(ifp);
4322
4323 ipv6_ifa_notify(0, ifp);
4324 in6_ifa_put(ifp);
4325 goto restart;
4326 }
4327 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4328 !(ifp->flags&IFA_F_TENTATIVE)) {
4329 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4330 ifp->idev->cnf.dad_transmits *
4331 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4332
4333 if (age >= ifp->prefered_lft - regen_advance) {
4334 struct inet6_ifaddr *ifpub = ifp->ifpub;
4335 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4336 next = ifp->tstamp + ifp->prefered_lft * HZ;
4337 if (!ifp->regen_count && ifpub) {
4338 ifp->regen_count++;
4339 in6_ifa_hold(ifp);
4340 in6_ifa_hold(ifpub);
4341 spin_unlock(&ifp->lock);
4342
4343 spin_lock(&ifpub->lock);
4344 ifpub->regen_count = 0;
4345 spin_unlock(&ifpub->lock);
4346 ipv6_create_tempaddr(ifpub, ifp);
4347 in6_ifa_put(ifpub);
4348 in6_ifa_put(ifp);
4349 goto restart;
4350 }
4351 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4352 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4353 spin_unlock(&ifp->lock);
4354 } else {
4355 /* ifp->prefered_lft <= ifp->valid_lft */
4356 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4357 next = ifp->tstamp + ifp->prefered_lft * HZ;
4358 spin_unlock(&ifp->lock);
4359 }
4360 }
4361 }
4362
4363 next_sec = round_jiffies_up(next);
4364 next_sched = next;
4365
4366 /* If rounded timeout is accurate enough, accept it. */
4367 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4368 next_sched = next_sec;
4369
4370 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4371 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4372 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4373
4374 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4375 now, next, next_sec, next_sched);
4376 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4377 rcu_read_unlock_bh();
4378 }
4379
4380 static void addrconf_verify_work(struct work_struct *w)
4381 {
4382 rtnl_lock();
4383 addrconf_verify_rtnl();
4384 rtnl_unlock();
4385 }
4386
4387 static void addrconf_verify(void)
4388 {
4389 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4390 }
4391
4392 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4393 struct in6_addr **peer_pfx)
4394 {
4395 struct in6_addr *pfx = NULL;
4396
4397 *peer_pfx = NULL;
4398
4399 if (addr)
4400 pfx = nla_data(addr);
4401
4402 if (local) {
4403 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4404 *peer_pfx = pfx;
4405 pfx = nla_data(local);
4406 }
4407
4408 return pfx;
4409 }
4410
4411 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4412 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4413 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4414 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4415 [IFA_FLAGS] = { .len = sizeof(u32) },
4416 };
4417
4418 static int
4419 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4420 struct netlink_ext_ack *extack)
4421 {
4422 struct net *net = sock_net(skb->sk);
4423 struct ifaddrmsg *ifm;
4424 struct nlattr *tb[IFA_MAX+1];
4425 struct in6_addr *pfx, *peer_pfx;
4426 u32 ifa_flags;
4427 int err;
4428
4429 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4430 extack);
4431 if (err < 0)
4432 return err;
4433
4434 ifm = nlmsg_data(nlh);
4435 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4436 if (!pfx)
4437 return -EINVAL;
4438
4439 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4440
4441 /* We ignore other flags so far. */
4442 ifa_flags &= IFA_F_MANAGETEMPADDR;
4443
4444 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4445 ifm->ifa_prefixlen);
4446 }
4447
4448 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4449 u32 prefered_lft, u32 valid_lft)
4450 {
4451 u32 flags;
4452 clock_t expires;
4453 unsigned long timeout;
4454 bool was_managetempaddr;
4455 bool had_prefixroute;
4456
4457 ASSERT_RTNL();
4458
4459 if (!valid_lft || (prefered_lft > valid_lft))
4460 return -EINVAL;
4461
4462 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4463 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4464 return -EINVAL;
4465
4466 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4467 if (addrconf_finite_timeout(timeout)) {
4468 expires = jiffies_to_clock_t(timeout * HZ);
4469 valid_lft = timeout;
4470 flags = RTF_EXPIRES;
4471 } else {
4472 expires = 0;
4473 flags = 0;
4474 ifa_flags |= IFA_F_PERMANENT;
4475 }
4476
4477 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4478 if (addrconf_finite_timeout(timeout)) {
4479 if (timeout == 0)
4480 ifa_flags |= IFA_F_DEPRECATED;
4481 prefered_lft = timeout;
4482 }
4483
4484 spin_lock_bh(&ifp->lock);
4485 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4486 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4487 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4488 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4489 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4490 IFA_F_NOPREFIXROUTE);
4491 ifp->flags |= ifa_flags;
4492 ifp->tstamp = jiffies;
4493 ifp->valid_lft = valid_lft;
4494 ifp->prefered_lft = prefered_lft;
4495
4496 spin_unlock_bh(&ifp->lock);
4497 if (!(ifp->flags&IFA_F_TENTATIVE))
4498 ipv6_ifa_notify(0, ifp);
4499
4500 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4501 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4502 expires, flags);
4503 } else if (had_prefixroute) {
4504 enum cleanup_prefix_rt_t action;
4505 unsigned long rt_expires;
4506
4507 write_lock_bh(&ifp->idev->lock);
4508 action = check_cleanup_prefix_route(ifp, &rt_expires);
4509 write_unlock_bh(&ifp->idev->lock);
4510
4511 if (action != CLEANUP_PREFIX_RT_NOP) {
4512 cleanup_prefix_route(ifp, rt_expires,
4513 action == CLEANUP_PREFIX_RT_DEL);
4514 }
4515 }
4516
4517 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4518 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4519 valid_lft = prefered_lft = 0;
4520 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4521 !was_managetempaddr, jiffies);
4522 }
4523
4524 addrconf_verify_rtnl();
4525
4526 return 0;
4527 }
4528
4529 static int
4530 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4531 struct netlink_ext_ack *extack)
4532 {
4533 struct net *net = sock_net(skb->sk);
4534 struct ifaddrmsg *ifm;
4535 struct nlattr *tb[IFA_MAX+1];
4536 struct in6_addr *pfx, *peer_pfx;
4537 struct inet6_ifaddr *ifa;
4538 struct net_device *dev;
4539 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4540 u32 ifa_flags;
4541 int err;
4542
4543 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4544 extack);
4545 if (err < 0)
4546 return err;
4547
4548 ifm = nlmsg_data(nlh);
4549 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4550 if (!pfx)
4551 return -EINVAL;
4552
4553 if (tb[IFA_CACHEINFO]) {
4554 struct ifa_cacheinfo *ci;
4555
4556 ci = nla_data(tb[IFA_CACHEINFO]);
4557 valid_lft = ci->ifa_valid;
4558 preferred_lft = ci->ifa_prefered;
4559 } else {
4560 preferred_lft = INFINITY_LIFE_TIME;
4561 valid_lft = INFINITY_LIFE_TIME;
4562 }
4563
4564 dev = __dev_get_by_index(net, ifm->ifa_index);
4565 if (!dev)
4566 return -ENODEV;
4567
4568 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4569
4570 /* We ignore other flags so far. */
4571 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4572 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4573
4574 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4575 if (!ifa) {
4576 /*
4577 * It would be best to check for !NLM_F_CREATE here but
4578 * userspace already relies on not having to provide this.
4579 */
4580 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4581 ifm->ifa_prefixlen, ifa_flags,
4582 preferred_lft, valid_lft);
4583 }
4584
4585 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4586 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4587 err = -EEXIST;
4588 else
4589 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4590
4591 in6_ifa_put(ifa);
4592
4593 return err;
4594 }
4595
4596 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4597 u8 scope, int ifindex)
4598 {
4599 struct ifaddrmsg *ifm;
4600
4601 ifm = nlmsg_data(nlh);
4602 ifm->ifa_family = AF_INET6;
4603 ifm->ifa_prefixlen = prefixlen;
4604 ifm->ifa_flags = flags;
4605 ifm->ifa_scope = scope;
4606 ifm->ifa_index = ifindex;
4607 }
4608
4609 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4610 unsigned long tstamp, u32 preferred, u32 valid)
4611 {
4612 struct ifa_cacheinfo ci;
4613
4614 ci.cstamp = cstamp_delta(cstamp);
4615 ci.tstamp = cstamp_delta(tstamp);
4616 ci.ifa_prefered = preferred;
4617 ci.ifa_valid = valid;
4618
4619 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4620 }
4621
4622 static inline int rt_scope(int ifa_scope)
4623 {
4624 if (ifa_scope & IFA_HOST)
4625 return RT_SCOPE_HOST;
4626 else if (ifa_scope & IFA_LINK)
4627 return RT_SCOPE_LINK;
4628 else if (ifa_scope & IFA_SITE)
4629 return RT_SCOPE_SITE;
4630 else
4631 return RT_SCOPE_UNIVERSE;
4632 }
4633
4634 static inline int inet6_ifaddr_msgsize(void)
4635 {
4636 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4637 + nla_total_size(16) /* IFA_LOCAL */
4638 + nla_total_size(16) /* IFA_ADDRESS */
4639 + nla_total_size(sizeof(struct ifa_cacheinfo))
4640 + nla_total_size(4) /* IFA_FLAGS */;
4641 }
4642
4643 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4644 u32 portid, u32 seq, int event, unsigned int flags)
4645 {
4646 struct nlmsghdr *nlh;
4647 u32 preferred, valid;
4648
4649 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4650 if (!nlh)
4651 return -EMSGSIZE;
4652
4653 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4654 ifa->idev->dev->ifindex);
4655
4656 if (!((ifa->flags&IFA_F_PERMANENT) &&
4657 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4658 preferred = ifa->prefered_lft;
4659 valid = ifa->valid_lft;
4660 if (preferred != INFINITY_LIFE_TIME) {
4661 long tval = (jiffies - ifa->tstamp)/HZ;
4662 if (preferred > tval)
4663 preferred -= tval;
4664 else
4665 preferred = 0;
4666 if (valid != INFINITY_LIFE_TIME) {
4667 if (valid > tval)
4668 valid -= tval;
4669 else
4670 valid = 0;
4671 }
4672 }
4673 } else {
4674 preferred = INFINITY_LIFE_TIME;
4675 valid = INFINITY_LIFE_TIME;
4676 }
4677
4678 if (!ipv6_addr_any(&ifa->peer_addr)) {
4679 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4680 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4681 goto error;
4682 } else
4683 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4684 goto error;
4685
4686 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4687 goto error;
4688
4689 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4690 goto error;
4691
4692 nlmsg_end(skb, nlh);
4693 return 0;
4694
4695 error:
4696 nlmsg_cancel(skb, nlh);
4697 return -EMSGSIZE;
4698 }
4699
4700 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4701 u32 portid, u32 seq, int event, u16 flags)
4702 {
4703 struct nlmsghdr *nlh;
4704 u8 scope = RT_SCOPE_UNIVERSE;
4705 int ifindex = ifmca->idev->dev->ifindex;
4706
4707 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4708 scope = RT_SCOPE_SITE;
4709
4710 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4711 if (!nlh)
4712 return -EMSGSIZE;
4713
4714 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4715 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4716 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4717 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4718 nlmsg_cancel(skb, nlh);
4719 return -EMSGSIZE;
4720 }
4721
4722 nlmsg_end(skb, nlh);
4723 return 0;
4724 }
4725
4726 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4727 u32 portid, u32 seq, int event, unsigned int flags)
4728 {
4729 struct nlmsghdr *nlh;
4730 u8 scope = RT_SCOPE_UNIVERSE;
4731 int ifindex = ifaca->aca_idev->dev->ifindex;
4732
4733 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4734 scope = RT_SCOPE_SITE;
4735
4736 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4737 if (!nlh)
4738 return -EMSGSIZE;
4739
4740 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4741 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4742 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4743 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4744 nlmsg_cancel(skb, nlh);
4745 return -EMSGSIZE;
4746 }
4747
4748 nlmsg_end(skb, nlh);
4749 return 0;
4750 }
4751
4752 enum addr_type_t {
4753 UNICAST_ADDR,
4754 MULTICAST_ADDR,
4755 ANYCAST_ADDR,
4756 };
4757
4758 /* called with rcu_read_lock() */
4759 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4760 struct netlink_callback *cb, enum addr_type_t type,
4761 int s_ip_idx, int *p_ip_idx)
4762 {
4763 struct ifmcaddr6 *ifmca;
4764 struct ifacaddr6 *ifaca;
4765 int err = 1;
4766 int ip_idx = *p_ip_idx;
4767
4768 read_lock_bh(&idev->lock);
4769 switch (type) {
4770 case UNICAST_ADDR: {
4771 struct inet6_ifaddr *ifa;
4772
4773 /* unicast address incl. temp addr */
4774 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4775 if (++ip_idx < s_ip_idx)
4776 continue;
4777 err = inet6_fill_ifaddr(skb, ifa,
4778 NETLINK_CB(cb->skb).portid,
4779 cb->nlh->nlmsg_seq,
4780 RTM_NEWADDR,
4781 NLM_F_MULTI);
4782 if (err < 0)
4783 break;
4784 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4785 }
4786 break;
4787 }
4788 case MULTICAST_ADDR:
4789 /* multicast address */
4790 for (ifmca = idev->mc_list; ifmca;
4791 ifmca = ifmca->next, ip_idx++) {
4792 if (ip_idx < s_ip_idx)
4793 continue;
4794 err = inet6_fill_ifmcaddr(skb, ifmca,
4795 NETLINK_CB(cb->skb).portid,
4796 cb->nlh->nlmsg_seq,
4797 RTM_GETMULTICAST,
4798 NLM_F_MULTI);
4799 if (err < 0)
4800 break;
4801 }
4802 break;
4803 case ANYCAST_ADDR:
4804 /* anycast address */
4805 for (ifaca = idev->ac_list; ifaca;
4806 ifaca = ifaca->aca_next, ip_idx++) {
4807 if (ip_idx < s_ip_idx)
4808 continue;
4809 err = inet6_fill_ifacaddr(skb, ifaca,
4810 NETLINK_CB(cb->skb).portid,
4811 cb->nlh->nlmsg_seq,
4812 RTM_GETANYCAST,
4813 NLM_F_MULTI);
4814 if (err < 0)
4815 break;
4816 }
4817 break;
4818 default:
4819 break;
4820 }
4821 read_unlock_bh(&idev->lock);
4822 *p_ip_idx = ip_idx;
4823 return err;
4824 }
4825
4826 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4827 enum addr_type_t type)
4828 {
4829 struct net *net = sock_net(skb->sk);
4830 int h, s_h;
4831 int idx, ip_idx;
4832 int s_idx, s_ip_idx;
4833 struct net_device *dev;
4834 struct inet6_dev *idev;
4835 struct hlist_head *head;
4836
4837 s_h = cb->args[0];
4838 s_idx = idx = cb->args[1];
4839 s_ip_idx = ip_idx = cb->args[2];
4840
4841 rcu_read_lock();
4842 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4843 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4844 idx = 0;
4845 head = &net->dev_index_head[h];
4846 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4847 if (idx < s_idx)
4848 goto cont;
4849 if (h > s_h || idx > s_idx)
4850 s_ip_idx = 0;
4851 ip_idx = 0;
4852 idev = __in6_dev_get(dev);
4853 if (!idev)
4854 goto cont;
4855
4856 if (in6_dump_addrs(idev, skb, cb, type,
4857 s_ip_idx, &ip_idx) < 0)
4858 goto done;
4859 cont:
4860 idx++;
4861 }
4862 }
4863 done:
4864 rcu_read_unlock();
4865 cb->args[0] = h;
4866 cb->args[1] = idx;
4867 cb->args[2] = ip_idx;
4868
4869 return skb->len;
4870 }
4871
4872 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4873 {
4874 enum addr_type_t type = UNICAST_ADDR;
4875
4876 return inet6_dump_addr(skb, cb, type);
4877 }
4878
4879 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4880 {
4881 enum addr_type_t type = MULTICAST_ADDR;
4882
4883 return inet6_dump_addr(skb, cb, type);
4884 }
4885
4886
4887 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4888 {
4889 enum addr_type_t type = ANYCAST_ADDR;
4890
4891 return inet6_dump_addr(skb, cb, type);
4892 }
4893
4894 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4895 struct netlink_ext_ack *extack)
4896 {
4897 struct net *net = sock_net(in_skb->sk);
4898 struct ifaddrmsg *ifm;
4899 struct nlattr *tb[IFA_MAX+1];
4900 struct in6_addr *addr = NULL, *peer;
4901 struct net_device *dev = NULL;
4902 struct inet6_ifaddr *ifa;
4903 struct sk_buff *skb;
4904 int err;
4905
4906 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4907 extack);
4908 if (err < 0)
4909 goto errout;
4910
4911 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4912 if (!addr) {
4913 err = -EINVAL;
4914 goto errout;
4915 }
4916
4917 ifm = nlmsg_data(nlh);
4918 if (ifm->ifa_index)
4919 dev = __dev_get_by_index(net, ifm->ifa_index);
4920
4921 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4922 if (!ifa) {
4923 err = -EADDRNOTAVAIL;
4924 goto errout;
4925 }
4926
4927 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4928 if (!skb) {
4929 err = -ENOBUFS;
4930 goto errout_ifa;
4931 }
4932
4933 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4934 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4935 if (err < 0) {
4936 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4937 WARN_ON(err == -EMSGSIZE);
4938 kfree_skb(skb);
4939 goto errout_ifa;
4940 }
4941 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4942 errout_ifa:
4943 in6_ifa_put(ifa);
4944 errout:
4945 return err;
4946 }
4947
4948 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4949 {
4950 struct sk_buff *skb;
4951 struct net *net = dev_net(ifa->idev->dev);
4952 int err = -ENOBUFS;
4953
4954 /* Don't send DELADDR notification for TENTATIVE address,
4955 * since NEWADDR notification is sent only after removing
4956 * TENTATIVE flag, if DAD has not failed.
4957 */
4958 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) &&
4959 event == RTM_DELADDR)
4960 return;
4961
4962 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4963 if (!skb)
4964 goto errout;
4965
4966 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4967 if (err < 0) {
4968 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4969 WARN_ON(err == -EMSGSIZE);
4970 kfree_skb(skb);
4971 goto errout;
4972 }
4973 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4974 return;
4975 errout:
4976 if (err < 0)
4977 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4978 }
4979
4980 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4981 __s32 *array, int bytes)
4982 {
4983 BUG_ON(bytes < (DEVCONF_MAX * 4));
4984
4985 memset(array, 0, bytes);
4986 array[DEVCONF_FORWARDING] = cnf->forwarding;
4987 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4988 array[DEVCONF_MTU6] = cnf->mtu6;
4989 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4990 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4991 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4992 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4993 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4994 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4995 jiffies_to_msecs(cnf->rtr_solicit_interval);
4996 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4997 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
4998 array[DEVCONF_RTR_SOLICIT_DELAY] =
4999 jiffies_to_msecs(cnf->rtr_solicit_delay);
5000 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5001 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5002 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5003 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5004 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5005 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5006 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5007 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5008 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5009 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5010 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5011 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5012 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5013 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5014 #ifdef CONFIG_IPV6_ROUTER_PREF
5015 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5016 array[DEVCONF_RTR_PROBE_INTERVAL] =
5017 jiffies_to_msecs(cnf->rtr_probe_interval);
5018 #ifdef CONFIG_IPV6_ROUTE_INFO
5019 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5020 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5021 #endif
5022 #endif
5023 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5024 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5025 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5026 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5027 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5028 #endif
5029 #ifdef CONFIG_IPV6_MROUTE
5030 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5031 #endif
5032 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5033 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5034 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5035 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5036 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5037 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5038 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5039 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5040 /* we omit DEVCONF_STABLE_SECRET for now */
5041 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5042 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5043 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5044 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5045 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5046 #ifdef CONFIG_IPV6_SEG6_HMAC
5047 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5048 #endif
5049 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5050 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5051 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5052 }
5053
5054 static inline size_t inet6_ifla6_size(void)
5055 {
5056 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5057 + nla_total_size(sizeof(struct ifla_cacheinfo))
5058 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5059 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5060 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5061 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5062 }
5063
5064 static inline size_t inet6_if_nlmsg_size(void)
5065 {
5066 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5067 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5068 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5069 + nla_total_size(4) /* IFLA_MTU */
5070 + nla_total_size(4) /* IFLA_LINK */
5071 + nla_total_size(1) /* IFLA_OPERSTATE */
5072 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5073 }
5074
5075 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5076 int bytes)
5077 {
5078 int i;
5079 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5080 BUG_ON(pad < 0);
5081
5082 /* Use put_unaligned() because stats may not be aligned for u64. */
5083 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5084 for (i = 1; i < ICMP6_MIB_MAX; i++)
5085 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5086
5087 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5088 }
5089
5090 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5091 int bytes, size_t syncpoff)
5092 {
5093 int i, c;
5094 u64 buff[IPSTATS_MIB_MAX];
5095 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5096
5097 BUG_ON(pad < 0);
5098
5099 memset(buff, 0, sizeof(buff));
5100 buff[0] = IPSTATS_MIB_MAX;
5101
5102 for_each_possible_cpu(c) {
5103 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5104 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5105 }
5106
5107 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5108 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5109 }
5110
5111 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5112 int bytes)
5113 {
5114 switch (attrtype) {
5115 case IFLA_INET6_STATS:
5116 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5117 offsetof(struct ipstats_mib, syncp));
5118 break;
5119 case IFLA_INET6_ICMP6STATS:
5120 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5121 break;
5122 }
5123 }
5124
5125 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5126 u32 ext_filter_mask)
5127 {
5128 struct nlattr *nla;
5129 struct ifla_cacheinfo ci;
5130
5131 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5132 goto nla_put_failure;
5133 ci.max_reasm_len = IPV6_MAXPLEN;
5134 ci.tstamp = cstamp_delta(idev->tstamp);
5135 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5136 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5137 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5138 goto nla_put_failure;
5139 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5140 if (!nla)
5141 goto nla_put_failure;
5142 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5143
5144 /* XXX - MC not implemented */
5145
5146 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5147 return 0;
5148
5149 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5150 if (!nla)
5151 goto nla_put_failure;
5152 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5153
5154 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5155 if (!nla)
5156 goto nla_put_failure;
5157 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5158
5159 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5160 if (!nla)
5161 goto nla_put_failure;
5162
5163 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5164 goto nla_put_failure;
5165
5166 read_lock_bh(&idev->lock);
5167 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5168 read_unlock_bh(&idev->lock);
5169
5170 return 0;
5171
5172 nla_put_failure:
5173 return -EMSGSIZE;
5174 }
5175
5176 static size_t inet6_get_link_af_size(const struct net_device *dev,
5177 u32 ext_filter_mask)
5178 {
5179 if (!__in6_dev_get(dev))
5180 return 0;
5181
5182 return inet6_ifla6_size();
5183 }
5184
5185 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5186 u32 ext_filter_mask)
5187 {
5188 struct inet6_dev *idev = __in6_dev_get(dev);
5189
5190 if (!idev)
5191 return -ENODATA;
5192
5193 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5194 return -EMSGSIZE;
5195
5196 return 0;
5197 }
5198
5199 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5200 {
5201 struct inet6_ifaddr *ifp;
5202 struct net_device *dev = idev->dev;
5203 bool clear_token, update_rs = false;
5204 struct in6_addr ll_addr;
5205
5206 ASSERT_RTNL();
5207
5208 if (!token)
5209 return -EINVAL;
5210 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5211 return -EINVAL;
5212 if (!ipv6_accept_ra(idev))
5213 return -EINVAL;
5214 if (idev->cnf.rtr_solicits == 0)
5215 return -EINVAL;
5216
5217 write_lock_bh(&idev->lock);
5218
5219 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5220 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5221
5222 write_unlock_bh(&idev->lock);
5223
5224 clear_token = ipv6_addr_any(token);
5225 if (clear_token)
5226 goto update_lft;
5227
5228 if (!idev->dead && (idev->if_flags & IF_READY) &&
5229 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5230 IFA_F_OPTIMISTIC)) {
5231 /* If we're not ready, then normal ifup will take care
5232 * of this. Otherwise, we need to request our rs here.
5233 */
5234 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5235 update_rs = true;
5236 }
5237
5238 update_lft:
5239 write_lock_bh(&idev->lock);
5240
5241 if (update_rs) {
5242 idev->if_flags |= IF_RS_SENT;
5243 idev->rs_interval = rfc3315_s14_backoff_init(
5244 idev->cnf.rtr_solicit_interval);
5245 idev->rs_probes = 1;
5246 addrconf_mod_rs_timer(idev, idev->rs_interval);
5247 }
5248
5249 /* Well, that's kinda nasty ... */
5250 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5251 spin_lock(&ifp->lock);
5252 if (ifp->tokenized) {
5253 ifp->valid_lft = 0;
5254 ifp->prefered_lft = 0;
5255 }
5256 spin_unlock(&ifp->lock);
5257 }
5258
5259 write_unlock_bh(&idev->lock);
5260 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5261 addrconf_verify_rtnl();
5262 return 0;
5263 }
5264
5265 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5266 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5267 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5268 };
5269
5270 static int inet6_validate_link_af(const struct net_device *dev,
5271 const struct nlattr *nla)
5272 {
5273 struct nlattr *tb[IFLA_INET6_MAX + 1];
5274
5275 if (dev && !__in6_dev_get(dev))
5276 return -EAFNOSUPPORT;
5277
5278 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5279 NULL);
5280 }
5281
5282 static int check_addr_gen_mode(int mode)
5283 {
5284 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5285 mode != IN6_ADDR_GEN_MODE_NONE &&
5286 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5287 mode != IN6_ADDR_GEN_MODE_RANDOM)
5288 return -EINVAL;
5289 return 1;
5290 }
5291
5292 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5293 int mode)
5294 {
5295 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5296 !idev->cnf.stable_secret.initialized &&
5297 !net->ipv6.devconf_dflt->stable_secret.initialized)
5298 return -EINVAL;
5299 return 1;
5300 }
5301
5302 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5303 {
5304 int err = -EINVAL;
5305 struct inet6_dev *idev = __in6_dev_get(dev);
5306 struct nlattr *tb[IFLA_INET6_MAX + 1];
5307
5308 if (!idev)
5309 return -EAFNOSUPPORT;
5310
5311 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5312 BUG();
5313
5314 if (tb[IFLA_INET6_TOKEN]) {
5315 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5316 if (err)
5317 return err;
5318 }
5319
5320 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5321 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5322
5323 if (check_addr_gen_mode(mode) < 0 ||
5324 check_stable_privacy(idev, dev_net(dev), mode) < 0)
5325 return -EINVAL;
5326
5327 idev->cnf.addr_gen_mode = mode;
5328 err = 0;
5329 }
5330
5331 return err;
5332 }
5333
5334 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5335 u32 portid, u32 seq, int event, unsigned int flags)
5336 {
5337 struct net_device *dev = idev->dev;
5338 struct ifinfomsg *hdr;
5339 struct nlmsghdr *nlh;
5340 void *protoinfo;
5341
5342 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5343 if (!nlh)
5344 return -EMSGSIZE;
5345
5346 hdr = nlmsg_data(nlh);
5347 hdr->ifi_family = AF_INET6;
5348 hdr->__ifi_pad = 0;
5349 hdr->ifi_type = dev->type;
5350 hdr->ifi_index = dev->ifindex;
5351 hdr->ifi_flags = dev_get_flags(dev);
5352 hdr->ifi_change = 0;
5353
5354 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5355 (dev->addr_len &&
5356 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5357 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5358 (dev->ifindex != dev_get_iflink(dev) &&
5359 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5360 nla_put_u8(skb, IFLA_OPERSTATE,
5361 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5362 goto nla_put_failure;
5363 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5364 if (!protoinfo)
5365 goto nla_put_failure;
5366
5367 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5368 goto nla_put_failure;
5369
5370 nla_nest_end(skb, protoinfo);
5371 nlmsg_end(skb, nlh);
5372 return 0;
5373
5374 nla_put_failure:
5375 nlmsg_cancel(skb, nlh);
5376 return -EMSGSIZE;
5377 }
5378
5379 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5380 {
5381 struct net *net = sock_net(skb->sk);
5382 int h, s_h;
5383 int idx = 0, s_idx;
5384 struct net_device *dev;
5385 struct inet6_dev *idev;
5386 struct hlist_head *head;
5387
5388 s_h = cb->args[0];
5389 s_idx = cb->args[1];
5390
5391 rcu_read_lock();
5392 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5393 idx = 0;
5394 head = &net->dev_index_head[h];
5395 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5396 if (idx < s_idx)
5397 goto cont;
5398 idev = __in6_dev_get(dev);
5399 if (!idev)
5400 goto cont;
5401 if (inet6_fill_ifinfo(skb, idev,
5402 NETLINK_CB(cb->skb).portid,
5403 cb->nlh->nlmsg_seq,
5404 RTM_NEWLINK, NLM_F_MULTI) < 0)
5405 goto out;
5406 cont:
5407 idx++;
5408 }
5409 }
5410 out:
5411 rcu_read_unlock();
5412 cb->args[1] = idx;
5413 cb->args[0] = h;
5414
5415 return skb->len;
5416 }
5417
5418 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5419 {
5420 struct sk_buff *skb;
5421 struct net *net = dev_net(idev->dev);
5422 int err = -ENOBUFS;
5423
5424 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5425 if (!skb)
5426 goto errout;
5427
5428 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5429 if (err < 0) {
5430 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5431 WARN_ON(err == -EMSGSIZE);
5432 kfree_skb(skb);
5433 goto errout;
5434 }
5435 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5436 return;
5437 errout:
5438 if (err < 0)
5439 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5440 }
5441
5442 static inline size_t inet6_prefix_nlmsg_size(void)
5443 {
5444 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5445 + nla_total_size(sizeof(struct in6_addr))
5446 + nla_total_size(sizeof(struct prefix_cacheinfo));
5447 }
5448
5449 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5450 struct prefix_info *pinfo, u32 portid, u32 seq,
5451 int event, unsigned int flags)
5452 {
5453 struct prefixmsg *pmsg;
5454 struct nlmsghdr *nlh;
5455 struct prefix_cacheinfo ci;
5456
5457 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5458 if (!nlh)
5459 return -EMSGSIZE;
5460
5461 pmsg = nlmsg_data(nlh);
5462 pmsg->prefix_family = AF_INET6;
5463 pmsg->prefix_pad1 = 0;
5464 pmsg->prefix_pad2 = 0;
5465 pmsg->prefix_ifindex = idev->dev->ifindex;
5466 pmsg->prefix_len = pinfo->prefix_len;
5467 pmsg->prefix_type = pinfo->type;
5468 pmsg->prefix_pad3 = 0;
5469 pmsg->prefix_flags = 0;
5470 if (pinfo->onlink)
5471 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5472 if (pinfo->autoconf)
5473 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5474
5475 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5476 goto nla_put_failure;
5477 ci.preferred_time = ntohl(pinfo->prefered);
5478 ci.valid_time = ntohl(pinfo->valid);
5479 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5480 goto nla_put_failure;
5481 nlmsg_end(skb, nlh);
5482 return 0;
5483
5484 nla_put_failure:
5485 nlmsg_cancel(skb, nlh);
5486 return -EMSGSIZE;
5487 }
5488
5489 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5490 struct prefix_info *pinfo)
5491 {
5492 struct sk_buff *skb;
5493 struct net *net = dev_net(idev->dev);
5494 int err = -ENOBUFS;
5495
5496 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5497 if (!skb)
5498 goto errout;
5499
5500 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5501 if (err < 0) {
5502 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5503 WARN_ON(err == -EMSGSIZE);
5504 kfree_skb(skb);
5505 goto errout;
5506 }
5507 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5508 return;
5509 errout:
5510 if (err < 0)
5511 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5512 }
5513
5514 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5515 {
5516 struct net *net = dev_net(ifp->idev->dev);
5517
5518 if (event)
5519 ASSERT_RTNL();
5520
5521 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5522
5523 switch (event) {
5524 case RTM_NEWADDR:
5525 /*
5526 * If the address was optimistic
5527 * we inserted the route at the start of
5528 * our DAD process, so we don't need
5529 * to do it again
5530 */
5531 if (!rcu_access_pointer(ifp->rt->rt6i_node))
5532 ip6_ins_rt(ifp->rt);
5533 if (ifp->idev->cnf.forwarding)
5534 addrconf_join_anycast(ifp);
5535 if (!ipv6_addr_any(&ifp->peer_addr))
5536 addrconf_prefix_route(&ifp->peer_addr, 128,
5537 ifp->idev->dev, 0, 0);
5538 break;
5539 case RTM_DELADDR:
5540 if (ifp->idev->cnf.forwarding)
5541 addrconf_leave_anycast(ifp);
5542 addrconf_leave_solict(ifp->idev, &ifp->addr);
5543 if (!ipv6_addr_any(&ifp->peer_addr)) {
5544 struct rt6_info *rt;
5545
5546 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5547 ifp->idev->dev, 0, 0);
5548 if (rt)
5549 ip6_del_rt(rt);
5550 }
5551 if (ifp->rt) {
5552 if (dst_hold_safe(&ifp->rt->dst))
5553 ip6_del_rt(ifp->rt);
5554 }
5555 rt_genid_bump_ipv6(net);
5556 break;
5557 }
5558 atomic_inc(&net->ipv6.dev_addr_genid);
5559 }
5560
5561 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5562 {
5563 rcu_read_lock_bh();
5564 if (likely(ifp->idev->dead == 0))
5565 __ipv6_ifa_notify(event, ifp);
5566 rcu_read_unlock_bh();
5567 }
5568
5569 #ifdef CONFIG_SYSCTL
5570
5571 static
5572 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5573 void __user *buffer, size_t *lenp, loff_t *ppos)
5574 {
5575 int *valp = ctl->data;
5576 int val = *valp;
5577 loff_t pos = *ppos;
5578 struct ctl_table lctl;
5579 int ret;
5580
5581 /*
5582 * ctl->data points to idev->cnf.forwarding, we should
5583 * not modify it until we get the rtnl lock.
5584 */
5585 lctl = *ctl;
5586 lctl.data = &val;
5587
5588 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5589
5590 if (write)
5591 ret = addrconf_fixup_forwarding(ctl, valp, val);
5592 if (ret)
5593 *ppos = pos;
5594 return ret;
5595 }
5596
5597 static
5598 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5599 void __user *buffer, size_t *lenp, loff_t *ppos)
5600 {
5601 struct inet6_dev *idev = ctl->extra1;
5602 int min_mtu = IPV6_MIN_MTU;
5603 struct ctl_table lctl;
5604
5605 lctl = *ctl;
5606 lctl.extra1 = &min_mtu;
5607 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5608
5609 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5610 }
5611
5612 static void dev_disable_change(struct inet6_dev *idev)
5613 {
5614 struct netdev_notifier_info info;
5615
5616 if (!idev || !idev->dev)
5617 return;
5618
5619 netdev_notifier_info_init(&info, idev->dev);
5620 if (idev->cnf.disable_ipv6)
5621 addrconf_notify(NULL, NETDEV_DOWN, &info);
5622 else
5623 addrconf_notify(NULL, NETDEV_UP, &info);
5624 }
5625
5626 static void addrconf_disable_change(struct net *net, __s32 newf)
5627 {
5628 struct net_device *dev;
5629 struct inet6_dev *idev;
5630
5631 for_each_netdev(net, dev) {
5632 idev = __in6_dev_get(dev);
5633 if (idev) {
5634 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5635 idev->cnf.disable_ipv6 = newf;
5636 if (changed)
5637 dev_disable_change(idev);
5638 }
5639 }
5640 }
5641
5642 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5643 {
5644 struct net *net;
5645 int old;
5646
5647 if (!rtnl_trylock())
5648 return restart_syscall();
5649
5650 net = (struct net *)table->extra2;
5651 old = *p;
5652 *p = newf;
5653
5654 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5655 rtnl_unlock();
5656 return 0;
5657 }
5658
5659 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5660 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5661 addrconf_disable_change(net, newf);
5662 } else if ((!newf) ^ (!old))
5663 dev_disable_change((struct inet6_dev *)table->extra1);
5664
5665 rtnl_unlock();
5666 return 0;
5667 }
5668
5669 static
5670 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5671 void __user *buffer, size_t *lenp, loff_t *ppos)
5672 {
5673 int *valp = ctl->data;
5674 int val = *valp;
5675 loff_t pos = *ppos;
5676 struct ctl_table lctl;
5677 int ret;
5678
5679 /*
5680 * ctl->data points to idev->cnf.disable_ipv6, we should
5681 * not modify it until we get the rtnl lock.
5682 */
5683 lctl = *ctl;
5684 lctl.data = &val;
5685
5686 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5687
5688 if (write)
5689 ret = addrconf_disable_ipv6(ctl, valp, val);
5690 if (ret)
5691 *ppos = pos;
5692 return ret;
5693 }
5694
5695 static
5696 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5697 void __user *buffer, size_t *lenp, loff_t *ppos)
5698 {
5699 int *valp = ctl->data;
5700 int ret;
5701 int old, new;
5702
5703 old = *valp;
5704 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5705 new = *valp;
5706
5707 if (write && old != new) {
5708 struct net *net = ctl->extra2;
5709
5710 if (!rtnl_trylock())
5711 return restart_syscall();
5712
5713 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5714 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5715 NETCONFA_PROXY_NEIGH,
5716 NETCONFA_IFINDEX_DEFAULT,
5717 net->ipv6.devconf_dflt);
5718 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5719 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5720 NETCONFA_PROXY_NEIGH,
5721 NETCONFA_IFINDEX_ALL,
5722 net->ipv6.devconf_all);
5723 else {
5724 struct inet6_dev *idev = ctl->extra1;
5725
5726 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5727 NETCONFA_PROXY_NEIGH,
5728 idev->dev->ifindex,
5729 &idev->cnf);
5730 }
5731 rtnl_unlock();
5732 }
5733
5734 return ret;
5735 }
5736
5737 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5738 void __user *buffer, size_t *lenp,
5739 loff_t *ppos)
5740 {
5741 int ret = 0;
5742 int new_val;
5743 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5744 struct net *net = (struct net *)ctl->extra2;
5745
5746 if (!rtnl_trylock())
5747 return restart_syscall();
5748
5749 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5750
5751 if (write) {
5752 new_val = *((int *)ctl->data);
5753
5754 if (check_addr_gen_mode(new_val) < 0) {
5755 ret = -EINVAL;
5756 goto out;
5757 }
5758
5759 /* request for default */
5760 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5761 ipv6_devconf_dflt.addr_gen_mode = new_val;
5762
5763 /* request for individual net device */
5764 } else {
5765 if (!idev)
5766 goto out;
5767
5768 if (check_stable_privacy(idev, net, new_val) < 0) {
5769 ret = -EINVAL;
5770 goto out;
5771 }
5772
5773 if (idev->cnf.addr_gen_mode != new_val) {
5774 idev->cnf.addr_gen_mode = new_val;
5775 addrconf_dev_config(idev->dev);
5776 }
5777 }
5778 }
5779
5780 out:
5781 rtnl_unlock();
5782
5783 return ret;
5784 }
5785
5786 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5787 void __user *buffer, size_t *lenp,
5788 loff_t *ppos)
5789 {
5790 int err;
5791 struct in6_addr addr;
5792 char str[IPV6_MAX_STRLEN];
5793 struct ctl_table lctl = *ctl;
5794 struct net *net = ctl->extra2;
5795 struct ipv6_stable_secret *secret = ctl->data;
5796
5797 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5798 return -EIO;
5799
5800 lctl.maxlen = IPV6_MAX_STRLEN;
5801 lctl.data = str;
5802
5803 if (!rtnl_trylock())
5804 return restart_syscall();
5805
5806 if (!write && !secret->initialized) {
5807 err = -EIO;
5808 goto out;
5809 }
5810
5811 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5812 if (err >= sizeof(str)) {
5813 err = -EIO;
5814 goto out;
5815 }
5816
5817 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5818 if (err || !write)
5819 goto out;
5820
5821 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5822 err = -EIO;
5823 goto out;
5824 }
5825
5826 secret->initialized = true;
5827 secret->secret = addr;
5828
5829 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5830 struct net_device *dev;
5831
5832 for_each_netdev(net, dev) {
5833 struct inet6_dev *idev = __in6_dev_get(dev);
5834
5835 if (idev) {
5836 idev->cnf.addr_gen_mode =
5837 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5838 }
5839 }
5840 } else {
5841 struct inet6_dev *idev = ctl->extra1;
5842
5843 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5844 }
5845
5846 out:
5847 rtnl_unlock();
5848
5849 return err;
5850 }
5851
5852 static
5853 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5854 int write,
5855 void __user *buffer,
5856 size_t *lenp,
5857 loff_t *ppos)
5858 {
5859 int *valp = ctl->data;
5860 int val = *valp;
5861 loff_t pos = *ppos;
5862 struct ctl_table lctl;
5863 int ret;
5864
5865 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5866 * we should not modify it until we get the rtnl lock.
5867 */
5868 lctl = *ctl;
5869 lctl.data = &val;
5870
5871 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5872
5873 if (write)
5874 ret = addrconf_fixup_linkdown(ctl, valp, val);
5875 if (ret)
5876 *ppos = pos;
5877 return ret;
5878 }
5879
5880 static
5881 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5882 {
5883 if (rt) {
5884 if (action)
5885 rt->dst.flags |= DST_NOPOLICY;
5886 else
5887 rt->dst.flags &= ~DST_NOPOLICY;
5888 }
5889 }
5890
5891 static
5892 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5893 {
5894 struct inet6_ifaddr *ifa;
5895
5896 read_lock_bh(&idev->lock);
5897 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5898 spin_lock(&ifa->lock);
5899 if (ifa->rt) {
5900 struct rt6_info *rt = ifa->rt;
5901 struct fib6_table *table = rt->rt6i_table;
5902 int cpu;
5903
5904 read_lock(&table->tb6_lock);
5905 addrconf_set_nopolicy(ifa->rt, val);
5906 if (rt->rt6i_pcpu) {
5907 for_each_possible_cpu(cpu) {
5908 struct rt6_info **rtp;
5909
5910 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5911 addrconf_set_nopolicy(*rtp, val);
5912 }
5913 }
5914 read_unlock(&table->tb6_lock);
5915 }
5916 spin_unlock(&ifa->lock);
5917 }
5918 read_unlock_bh(&idev->lock);
5919 }
5920
5921 static
5922 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5923 {
5924 struct inet6_dev *idev;
5925 struct net *net;
5926
5927 if (!rtnl_trylock())
5928 return restart_syscall();
5929
5930 *valp = val;
5931
5932 net = (struct net *)ctl->extra2;
5933 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5934 rtnl_unlock();
5935 return 0;
5936 }
5937
5938 if (valp == &net->ipv6.devconf_all->disable_policy) {
5939 struct net_device *dev;
5940
5941 for_each_netdev(net, dev) {
5942 idev = __in6_dev_get(dev);
5943 if (idev)
5944 addrconf_disable_policy_idev(idev, val);
5945 }
5946 } else {
5947 idev = (struct inet6_dev *)ctl->extra1;
5948 addrconf_disable_policy_idev(idev, val);
5949 }
5950
5951 rtnl_unlock();
5952 return 0;
5953 }
5954
5955 static
5956 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5957 void __user *buffer, size_t *lenp,
5958 loff_t *ppos)
5959 {
5960 int *valp = ctl->data;
5961 int val = *valp;
5962 loff_t pos = *ppos;
5963 struct ctl_table lctl;
5964 int ret;
5965
5966 lctl = *ctl;
5967 lctl.data = &val;
5968 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5969
5970 if (write && (*valp != val))
5971 ret = addrconf_disable_policy(ctl, valp, val);
5972
5973 if (ret)
5974 *ppos = pos;
5975
5976 return ret;
5977 }
5978
5979 static int minus_one = -1;
5980 static const int one = 1;
5981 static const int two_five_five = 255;
5982
5983 static const struct ctl_table addrconf_sysctl[] = {
5984 {
5985 .procname = "forwarding",
5986 .data = &ipv6_devconf.forwarding,
5987 .maxlen = sizeof(int),
5988 .mode = 0644,
5989 .proc_handler = addrconf_sysctl_forward,
5990 },
5991 {
5992 .procname = "hop_limit",
5993 .data = &ipv6_devconf.hop_limit,
5994 .maxlen = sizeof(int),
5995 .mode = 0644,
5996 .proc_handler = proc_dointvec_minmax,
5997 .extra1 = (void *)&one,
5998 .extra2 = (void *)&two_five_five,
5999 },
6000 {
6001 .procname = "mtu",
6002 .data = &ipv6_devconf.mtu6,
6003 .maxlen = sizeof(int),
6004 .mode = 0644,
6005 .proc_handler = addrconf_sysctl_mtu,
6006 },
6007 {
6008 .procname = "accept_ra",
6009 .data = &ipv6_devconf.accept_ra,
6010 .maxlen = sizeof(int),
6011 .mode = 0644,
6012 .proc_handler = proc_dointvec,
6013 },
6014 {
6015 .procname = "accept_redirects",
6016 .data = &ipv6_devconf.accept_redirects,
6017 .maxlen = sizeof(int),
6018 .mode = 0644,
6019 .proc_handler = proc_dointvec,
6020 },
6021 {
6022 .procname = "autoconf",
6023 .data = &ipv6_devconf.autoconf,
6024 .maxlen = sizeof(int),
6025 .mode = 0644,
6026 .proc_handler = proc_dointvec,
6027 },
6028 {
6029 .procname = "dad_transmits",
6030 .data = &ipv6_devconf.dad_transmits,
6031 .maxlen = sizeof(int),
6032 .mode = 0644,
6033 .proc_handler = proc_dointvec,
6034 },
6035 {
6036 .procname = "router_solicitations",
6037 .data = &ipv6_devconf.rtr_solicits,
6038 .maxlen = sizeof(int),
6039 .mode = 0644,
6040 .proc_handler = proc_dointvec_minmax,
6041 .extra1 = &minus_one,
6042 },
6043 {
6044 .procname = "router_solicitation_interval",
6045 .data = &ipv6_devconf.rtr_solicit_interval,
6046 .maxlen = sizeof(int),
6047 .mode = 0644,
6048 .proc_handler = proc_dointvec_jiffies,
6049 },
6050 {
6051 .procname = "router_solicitation_max_interval",
6052 .data = &ipv6_devconf.rtr_solicit_max_interval,
6053 .maxlen = sizeof(int),
6054 .mode = 0644,
6055 .proc_handler = proc_dointvec_jiffies,
6056 },
6057 {
6058 .procname = "router_solicitation_delay",
6059 .data = &ipv6_devconf.rtr_solicit_delay,
6060 .maxlen = sizeof(int),
6061 .mode = 0644,
6062 .proc_handler = proc_dointvec_jiffies,
6063 },
6064 {
6065 .procname = "force_mld_version",
6066 .data = &ipv6_devconf.force_mld_version,
6067 .maxlen = sizeof(int),
6068 .mode = 0644,
6069 .proc_handler = proc_dointvec,
6070 },
6071 {
6072 .procname = "mldv1_unsolicited_report_interval",
6073 .data =
6074 &ipv6_devconf.mldv1_unsolicited_report_interval,
6075 .maxlen = sizeof(int),
6076 .mode = 0644,
6077 .proc_handler = proc_dointvec_ms_jiffies,
6078 },
6079 {
6080 .procname = "mldv2_unsolicited_report_interval",
6081 .data =
6082 &ipv6_devconf.mldv2_unsolicited_report_interval,
6083 .maxlen = sizeof(int),
6084 .mode = 0644,
6085 .proc_handler = proc_dointvec_ms_jiffies,
6086 },
6087 {
6088 .procname = "use_tempaddr",
6089 .data = &ipv6_devconf.use_tempaddr,
6090 .maxlen = sizeof(int),
6091 .mode = 0644,
6092 .proc_handler = proc_dointvec,
6093 },
6094 {
6095 .procname = "temp_valid_lft",
6096 .data = &ipv6_devconf.temp_valid_lft,
6097 .maxlen = sizeof(int),
6098 .mode = 0644,
6099 .proc_handler = proc_dointvec,
6100 },
6101 {
6102 .procname = "temp_prefered_lft",
6103 .data = &ipv6_devconf.temp_prefered_lft,
6104 .maxlen = sizeof(int),
6105 .mode = 0644,
6106 .proc_handler = proc_dointvec,
6107 },
6108 {
6109 .procname = "regen_max_retry",
6110 .data = &ipv6_devconf.regen_max_retry,
6111 .maxlen = sizeof(int),
6112 .mode = 0644,
6113 .proc_handler = proc_dointvec,
6114 },
6115 {
6116 .procname = "max_desync_factor",
6117 .data = &ipv6_devconf.max_desync_factor,
6118 .maxlen = sizeof(int),
6119 .mode = 0644,
6120 .proc_handler = proc_dointvec,
6121 },
6122 {
6123 .procname = "max_addresses",
6124 .data = &ipv6_devconf.max_addresses,
6125 .maxlen = sizeof(int),
6126 .mode = 0644,
6127 .proc_handler = proc_dointvec,
6128 },
6129 {
6130 .procname = "accept_ra_defrtr",
6131 .data = &ipv6_devconf.accept_ra_defrtr,
6132 .maxlen = sizeof(int),
6133 .mode = 0644,
6134 .proc_handler = proc_dointvec,
6135 },
6136 {
6137 .procname = "accept_ra_min_hop_limit",
6138 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6139 .maxlen = sizeof(int),
6140 .mode = 0644,
6141 .proc_handler = proc_dointvec,
6142 },
6143 {
6144 .procname = "accept_ra_pinfo",
6145 .data = &ipv6_devconf.accept_ra_pinfo,
6146 .maxlen = sizeof(int),
6147 .mode = 0644,
6148 .proc_handler = proc_dointvec,
6149 },
6150 #ifdef CONFIG_IPV6_ROUTER_PREF
6151 {
6152 .procname = "accept_ra_rtr_pref",
6153 .data = &ipv6_devconf.accept_ra_rtr_pref,
6154 .maxlen = sizeof(int),
6155 .mode = 0644,
6156 .proc_handler = proc_dointvec,
6157 },
6158 {
6159 .procname = "router_probe_interval",
6160 .data = &ipv6_devconf.rtr_probe_interval,
6161 .maxlen = sizeof(int),
6162 .mode = 0644,
6163 .proc_handler = proc_dointvec_jiffies,
6164 },
6165 #ifdef CONFIG_IPV6_ROUTE_INFO
6166 {
6167 .procname = "accept_ra_rt_info_min_plen",
6168 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6169 .maxlen = sizeof(int),
6170 .mode = 0644,
6171 .proc_handler = proc_dointvec,
6172 },
6173 {
6174 .procname = "accept_ra_rt_info_max_plen",
6175 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6176 .maxlen = sizeof(int),
6177 .mode = 0644,
6178 .proc_handler = proc_dointvec,
6179 },
6180 #endif
6181 #endif
6182 {
6183 .procname = "proxy_ndp",
6184 .data = &ipv6_devconf.proxy_ndp,
6185 .maxlen = sizeof(int),
6186 .mode = 0644,
6187 .proc_handler = addrconf_sysctl_proxy_ndp,
6188 },
6189 {
6190 .procname = "accept_source_route",
6191 .data = &ipv6_devconf.accept_source_route,
6192 .maxlen = sizeof(int),
6193 .mode = 0644,
6194 .proc_handler = proc_dointvec,
6195 },
6196 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6197 {
6198 .procname = "optimistic_dad",
6199 .data = &ipv6_devconf.optimistic_dad,
6200 .maxlen = sizeof(int),
6201 .mode = 0644,
6202 .proc_handler = proc_dointvec,
6203 },
6204 {
6205 .procname = "use_optimistic",
6206 .data = &ipv6_devconf.use_optimistic,
6207 .maxlen = sizeof(int),
6208 .mode = 0644,
6209 .proc_handler = proc_dointvec,
6210 },
6211 #endif
6212 #ifdef CONFIG_IPV6_MROUTE
6213 {
6214 .procname = "mc_forwarding",
6215 .data = &ipv6_devconf.mc_forwarding,
6216 .maxlen = sizeof(int),
6217 .mode = 0444,
6218 .proc_handler = proc_dointvec,
6219 },
6220 #endif
6221 {
6222 .procname = "disable_ipv6",
6223 .data = &ipv6_devconf.disable_ipv6,
6224 .maxlen = sizeof(int),
6225 .mode = 0644,
6226 .proc_handler = addrconf_sysctl_disable,
6227 },
6228 {
6229 .procname = "accept_dad",
6230 .data = &ipv6_devconf.accept_dad,
6231 .maxlen = sizeof(int),
6232 .mode = 0644,
6233 .proc_handler = proc_dointvec,
6234 },
6235 {
6236 .procname = "force_tllao",
6237 .data = &ipv6_devconf.force_tllao,
6238 .maxlen = sizeof(int),
6239 .mode = 0644,
6240 .proc_handler = proc_dointvec
6241 },
6242 {
6243 .procname = "ndisc_notify",
6244 .data = &ipv6_devconf.ndisc_notify,
6245 .maxlen = sizeof(int),
6246 .mode = 0644,
6247 .proc_handler = proc_dointvec
6248 },
6249 {
6250 .procname = "suppress_frag_ndisc",
6251 .data = &ipv6_devconf.suppress_frag_ndisc,
6252 .maxlen = sizeof(int),
6253 .mode = 0644,
6254 .proc_handler = proc_dointvec
6255 },
6256 {
6257 .procname = "accept_ra_from_local",
6258 .data = &ipv6_devconf.accept_ra_from_local,
6259 .maxlen = sizeof(int),
6260 .mode = 0644,
6261 .proc_handler = proc_dointvec,
6262 },
6263 {
6264 .procname = "accept_ra_mtu",
6265 .data = &ipv6_devconf.accept_ra_mtu,
6266 .maxlen = sizeof(int),
6267 .mode = 0644,
6268 .proc_handler = proc_dointvec,
6269 },
6270 {
6271 .procname = "stable_secret",
6272 .data = &ipv6_devconf.stable_secret,
6273 .maxlen = IPV6_MAX_STRLEN,
6274 .mode = 0600,
6275 .proc_handler = addrconf_sysctl_stable_secret,
6276 },
6277 {
6278 .procname = "use_oif_addrs_only",
6279 .data = &ipv6_devconf.use_oif_addrs_only,
6280 .maxlen = sizeof(int),
6281 .mode = 0644,
6282 .proc_handler = proc_dointvec,
6283 },
6284 {
6285 .procname = "ignore_routes_with_linkdown",
6286 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6287 .maxlen = sizeof(int),
6288 .mode = 0644,
6289 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6290 },
6291 {
6292 .procname = "drop_unicast_in_l2_multicast",
6293 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6294 .maxlen = sizeof(int),
6295 .mode = 0644,
6296 .proc_handler = proc_dointvec,
6297 },
6298 {
6299 .procname = "drop_unsolicited_na",
6300 .data = &ipv6_devconf.drop_unsolicited_na,
6301 .maxlen = sizeof(int),
6302 .mode = 0644,
6303 .proc_handler = proc_dointvec,
6304 },
6305 {
6306 .procname = "keep_addr_on_down",
6307 .data = &ipv6_devconf.keep_addr_on_down,
6308 .maxlen = sizeof(int),
6309 .mode = 0644,
6310 .proc_handler = proc_dointvec,
6311
6312 },
6313 {
6314 .procname = "seg6_enabled",
6315 .data = &ipv6_devconf.seg6_enabled,
6316 .maxlen = sizeof(int),
6317 .mode = 0644,
6318 .proc_handler = proc_dointvec,
6319 },
6320 #ifdef CONFIG_IPV6_SEG6_HMAC
6321 {
6322 .procname = "seg6_require_hmac",
6323 .data = &ipv6_devconf.seg6_require_hmac,
6324 .maxlen = sizeof(int),
6325 .mode = 0644,
6326 .proc_handler = proc_dointvec,
6327 },
6328 #endif
6329 {
6330 .procname = "enhanced_dad",
6331 .data = &ipv6_devconf.enhanced_dad,
6332 .maxlen = sizeof(int),
6333 .mode = 0644,
6334 .proc_handler = proc_dointvec,
6335 },
6336 {
6337 .procname = "addr_gen_mode",
6338 .data = &ipv6_devconf.addr_gen_mode,
6339 .maxlen = sizeof(int),
6340 .mode = 0644,
6341 .proc_handler = addrconf_sysctl_addr_gen_mode,
6342 },
6343 {
6344 .procname = "disable_policy",
6345 .data = &ipv6_devconf.disable_policy,
6346 .maxlen = sizeof(int),
6347 .mode = 0644,
6348 .proc_handler = addrconf_sysctl_disable_policy,
6349 },
6350 {
6351 /* sentinel */
6352 }
6353 };
6354
6355 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6356 struct inet6_dev *idev, struct ipv6_devconf *p)
6357 {
6358 int i, ifindex;
6359 struct ctl_table *table;
6360 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6361
6362 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6363 if (!table)
6364 goto out;
6365
6366 for (i = 0; table[i].data; i++) {
6367 table[i].data += (char *)p - (char *)&ipv6_devconf;
6368 /* If one of these is already set, then it is not safe to
6369 * overwrite either of them: this makes proc_dointvec_minmax
6370 * usable.
6371 */
6372 if (!table[i].extra1 && !table[i].extra2) {
6373 table[i].extra1 = idev; /* embedded; no ref */
6374 table[i].extra2 = net;
6375 }
6376 }
6377
6378 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6379
6380 p->sysctl_header = register_net_sysctl(net, path, table);
6381 if (!p->sysctl_header)
6382 goto free;
6383
6384 if (!strcmp(dev_name, "all"))
6385 ifindex = NETCONFA_IFINDEX_ALL;
6386 else if (!strcmp(dev_name, "default"))
6387 ifindex = NETCONFA_IFINDEX_DEFAULT;
6388 else
6389 ifindex = idev->dev->ifindex;
6390 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6391 ifindex, p);
6392 return 0;
6393
6394 free:
6395 kfree(table);
6396 out:
6397 return -ENOBUFS;
6398 }
6399
6400 static void __addrconf_sysctl_unregister(struct net *net,
6401 struct ipv6_devconf *p, int ifindex)
6402 {
6403 struct ctl_table *table;
6404
6405 if (!p->sysctl_header)
6406 return;
6407
6408 table = p->sysctl_header->ctl_table_arg;
6409 unregister_net_sysctl_table(p->sysctl_header);
6410 p->sysctl_header = NULL;
6411 kfree(table);
6412
6413 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6414 }
6415
6416 static int addrconf_sysctl_register(struct inet6_dev *idev)
6417 {
6418 int err;
6419
6420 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6421 return -EINVAL;
6422
6423 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6424 &ndisc_ifinfo_sysctl_change);
6425 if (err)
6426 return err;
6427 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6428 idev, &idev->cnf);
6429 if (err)
6430 neigh_sysctl_unregister(idev->nd_parms);
6431
6432 return err;
6433 }
6434
6435 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6436 {
6437 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6438 idev->dev->ifindex);
6439 neigh_sysctl_unregister(idev->nd_parms);
6440 }
6441
6442
6443 #endif
6444
6445 static int __net_init addrconf_init_net(struct net *net)
6446 {
6447 int err = -ENOMEM;
6448 struct ipv6_devconf *all, *dflt;
6449
6450 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6451 if (!all)
6452 goto err_alloc_all;
6453
6454 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6455 if (!dflt)
6456 goto err_alloc_dflt;
6457
6458 /* these will be inherited by all namespaces */
6459 dflt->autoconf = ipv6_defaults.autoconf;
6460 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6461
6462 dflt->stable_secret.initialized = false;
6463 all->stable_secret.initialized = false;
6464
6465 net->ipv6.devconf_all = all;
6466 net->ipv6.devconf_dflt = dflt;
6467
6468 #ifdef CONFIG_SYSCTL
6469 err = __addrconf_sysctl_register(net, "all", NULL, all);
6470 if (err < 0)
6471 goto err_reg_all;
6472
6473 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6474 if (err < 0)
6475 goto err_reg_dflt;
6476 #endif
6477 return 0;
6478
6479 #ifdef CONFIG_SYSCTL
6480 err_reg_dflt:
6481 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6482 err_reg_all:
6483 kfree(dflt);
6484 #endif
6485 err_alloc_dflt:
6486 kfree(all);
6487 err_alloc_all:
6488 return err;
6489 }
6490
6491 static void __net_exit addrconf_exit_net(struct net *net)
6492 {
6493 #ifdef CONFIG_SYSCTL
6494 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6495 NETCONFA_IFINDEX_DEFAULT);
6496 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6497 NETCONFA_IFINDEX_ALL);
6498 #endif
6499 kfree(net->ipv6.devconf_dflt);
6500 kfree(net->ipv6.devconf_all);
6501 }
6502
6503 static struct pernet_operations addrconf_ops = {
6504 .init = addrconf_init_net,
6505 .exit = addrconf_exit_net,
6506 };
6507
6508 static struct rtnl_af_ops inet6_ops __read_mostly = {
6509 .family = AF_INET6,
6510 .fill_link_af = inet6_fill_link_af,
6511 .get_link_af_size = inet6_get_link_af_size,
6512 .validate_link_af = inet6_validate_link_af,
6513 .set_link_af = inet6_set_link_af,
6514 };
6515
6516 /*
6517 * Init / cleanup code
6518 */
6519
6520 int __init addrconf_init(void)
6521 {
6522 struct inet6_dev *idev;
6523 int i, err;
6524
6525 err = ipv6_addr_label_init();
6526 if (err < 0) {
6527 pr_crit("%s: cannot initialize default policy table: %d\n",
6528 __func__, err);
6529 goto out;
6530 }
6531
6532 err = register_pernet_subsys(&addrconf_ops);
6533 if (err < 0)
6534 goto out_addrlabel;
6535
6536 addrconf_wq = create_workqueue("ipv6_addrconf");
6537 if (!addrconf_wq) {
6538 err = -ENOMEM;
6539 goto out_nowq;
6540 }
6541
6542 /* The addrconf netdev notifier requires that loopback_dev
6543 * has it's ipv6 private information allocated and setup
6544 * before it can bring up and give link-local addresses
6545 * to other devices which are up.
6546 *
6547 * Unfortunately, loopback_dev is not necessarily the first
6548 * entry in the global dev_base list of net devices. In fact,
6549 * it is likely to be the very last entry on that list.
6550 * So this causes the notifier registry below to try and
6551 * give link-local addresses to all devices besides loopback_dev
6552 * first, then loopback_dev, which cases all the non-loopback_dev
6553 * devices to fail to get a link-local address.
6554 *
6555 * So, as a temporary fix, allocate the ipv6 structure for
6556 * loopback_dev first by hand.
6557 * Longer term, all of the dependencies ipv6 has upon the loopback
6558 * device and it being up should be removed.
6559 */
6560 rtnl_lock();
6561 idev = ipv6_add_dev(init_net.loopback_dev);
6562 rtnl_unlock();
6563 if (IS_ERR(idev)) {
6564 err = PTR_ERR(idev);
6565 goto errlo;
6566 }
6567
6568 ip6_route_init_special_entries();
6569
6570 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6571 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6572
6573 register_netdevice_notifier(&ipv6_dev_notf);
6574
6575 addrconf_verify();
6576
6577 rtnl_af_register(&inet6_ops);
6578
6579 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6580 0);
6581 if (err < 0)
6582 goto errout;
6583
6584 /* Only the first call to __rtnl_register can fail */
6585 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, 0);
6586 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, 0);
6587 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6588 inet6_dump_ifaddr, 0);
6589 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6590 inet6_dump_ifmcaddr, 0);
6591 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6592 inet6_dump_ifacaddr, 0);
6593 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6594 inet6_netconf_dump_devconf, 0);
6595
6596 ipv6_addr_label_rtnl_register();
6597
6598 return 0;
6599 errout:
6600 rtnl_af_unregister(&inet6_ops);
6601 unregister_netdevice_notifier(&ipv6_dev_notf);
6602 errlo:
6603 destroy_workqueue(addrconf_wq);
6604 out_nowq:
6605 unregister_pernet_subsys(&addrconf_ops);
6606 out_addrlabel:
6607 ipv6_addr_label_cleanup();
6608 out:
6609 return err;
6610 }
6611
6612 void addrconf_cleanup(void)
6613 {
6614 struct net_device *dev;
6615 int i;
6616
6617 unregister_netdevice_notifier(&ipv6_dev_notf);
6618 unregister_pernet_subsys(&addrconf_ops);
6619 ipv6_addr_label_cleanup();
6620
6621 rtnl_lock();
6622
6623 __rtnl_af_unregister(&inet6_ops);
6624
6625 /* clean dev list */
6626 for_each_netdev(&init_net, dev) {
6627 if (__in6_dev_get(dev) == NULL)
6628 continue;
6629 addrconf_ifdown(dev, 1);
6630 }
6631 addrconf_ifdown(init_net.loopback_dev, 2);
6632
6633 /*
6634 * Check hash table.
6635 */
6636 spin_lock_bh(&addrconf_hash_lock);
6637 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6638 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6639 spin_unlock_bh(&addrconf_hash_lock);
6640 cancel_delayed_work(&addr_chk_work);
6641 rtnl_unlock();
6642
6643 destroy_workqueue(addrconf_wq);
6644 }
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