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xfs: add full xfs_dqblk verifier
[linux/fpc-iii.git] / net / ipv6 / addrconf.c
blob78cef00c9596d7cf95dcc12e5cf05949b1987cbf
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 #define INFINITY_LIFE_TIME 0xFFFFFFFF
98
99 #define IPV6_MAX_STRLEN \
100 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
101
102 static inline u32 cstamp_delta(unsigned long cstamp)
103 {
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105 }
106
107 static inline s32 rfc3315_s14_backoff_init(s32 irt)
108 {
109 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
110 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
111 do_div(tmp, 1000000);
112 return (s32)tmp;
113 }
114
115 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
116 {
117 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
118 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
119 do_div(tmp, 1000000);
120 if ((s32)tmp > mrt) {
121 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
122 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
123 do_div(tmp, 1000000);
124 }
125 return (s32)tmp;
126 }
127
128 #ifdef CONFIG_SYSCTL
129 static int addrconf_sysctl_register(struct inet6_dev *idev);
130 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
131 #else
132 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
133 {
134 return 0;
135 }
136
137 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
138 {
139 }
140 #endif
141
142 static void ipv6_regen_rndid(struct inet6_dev *idev);
143 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
144
145 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
146 static int ipv6_count_addresses(const struct inet6_dev *idev);
147 static int ipv6_generate_stable_address(struct in6_addr *addr,
148 u8 dad_count,
149 const struct inet6_dev *idev);
150
151 #define IN6_ADDR_HSIZE_SHIFT 8
152 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
153 /*
154 * Configured unicast address hash table
155 */
156 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
157 static DEFINE_SPINLOCK(addrconf_hash_lock);
158
159 static void addrconf_verify(void);
160 static void addrconf_verify_rtnl(void);
161 static void addrconf_verify_work(struct work_struct *);
162
163 static struct workqueue_struct *addrconf_wq;
164 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
165
166 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
167 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
168
169 static void addrconf_type_change(struct net_device *dev,
170 unsigned long event);
171 static int addrconf_ifdown(struct net_device *dev, int how);
172
173 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
174 int plen,
175 const struct net_device *dev,
176 u32 flags, u32 noflags);
177
178 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
179 static void addrconf_dad_work(struct work_struct *w);
180 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
181 bool send_na);
182 static void addrconf_dad_run(struct inet6_dev *idev);
183 static void addrconf_rs_timer(struct timer_list *t);
184 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
185 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
186
187 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
188 struct prefix_info *pinfo);
189
190 static struct ipv6_devconf ipv6_devconf __read_mostly = {
191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .force_mld_version = 0,
198 .mldv1_unsolicited_report_interval = 10 * HZ,
199 .mldv2_unsolicited_report_interval = HZ,
200 .dad_transmits = 1,
201 .rtr_solicits = MAX_RTR_SOLICITATIONS,
202 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
203 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
205 .use_tempaddr = 0,
206 .temp_valid_lft = TEMP_VALID_LIFETIME,
207 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
208 .regen_max_retry = REGEN_MAX_RETRY,
209 .max_desync_factor = MAX_DESYNC_FACTOR,
210 .max_addresses = IPV6_MAX_ADDRESSES,
211 .accept_ra_defrtr = 1,
212 .accept_ra_from_local = 0,
213 .accept_ra_min_hop_limit= 1,
214 .accept_ra_pinfo = 1,
215 #ifdef CONFIG_IPV6_ROUTER_PREF
216 .accept_ra_rtr_pref = 1,
217 .rtr_probe_interval = 60 * HZ,
218 #ifdef CONFIG_IPV6_ROUTE_INFO
219 .accept_ra_rt_info_min_plen = 0,
220 .accept_ra_rt_info_max_plen = 0,
221 #endif
222 #endif
223 .proxy_ndp = 0,
224 .accept_source_route = 0, /* we do not accept RH0 by default. */
225 .disable_ipv6 = 0,
226 .accept_dad = 0,
227 .suppress_frag_ndisc = 1,
228 .accept_ra_mtu = 1,
229 .stable_secret = {
230 .initialized = false,
231 },
232 .use_oif_addrs_only = 0,
233 .ignore_routes_with_linkdown = 0,
234 .keep_addr_on_down = 0,
235 .seg6_enabled = 0,
236 #ifdef CONFIG_IPV6_SEG6_HMAC
237 .seg6_require_hmac = 0,
238 #endif
239 .enhanced_dad = 1,
240 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
241 .disable_policy = 0,
242 };
243
244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
245 .forwarding = 0,
246 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
247 .mtu6 = IPV6_MIN_MTU,
248 .accept_ra = 1,
249 .accept_redirects = 1,
250 .autoconf = 1,
251 .force_mld_version = 0,
252 .mldv1_unsolicited_report_interval = 10 * HZ,
253 .mldv2_unsolicited_report_interval = HZ,
254 .dad_transmits = 1,
255 .rtr_solicits = MAX_RTR_SOLICITATIONS,
256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
259 .use_tempaddr = 0,
260 .temp_valid_lft = TEMP_VALID_LIFETIME,
261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
262 .regen_max_retry = REGEN_MAX_RETRY,
263 .max_desync_factor = MAX_DESYNC_FACTOR,
264 .max_addresses = IPV6_MAX_ADDRESSES,
265 .accept_ra_defrtr = 1,
266 .accept_ra_from_local = 0,
267 .accept_ra_min_hop_limit= 1,
268 .accept_ra_pinfo = 1,
269 #ifdef CONFIG_IPV6_ROUTER_PREF
270 .accept_ra_rtr_pref = 1,
271 .rtr_probe_interval = 60 * HZ,
272 #ifdef CONFIG_IPV6_ROUTE_INFO
273 .accept_ra_rt_info_min_plen = 0,
274 .accept_ra_rt_info_max_plen = 0,
275 #endif
276 #endif
277 .proxy_ndp = 0,
278 .accept_source_route = 0, /* we do not accept RH0 by default. */
279 .disable_ipv6 = 0,
280 .accept_dad = 1,
281 .suppress_frag_ndisc = 1,
282 .accept_ra_mtu = 1,
283 .stable_secret = {
284 .initialized = false,
285 },
286 .use_oif_addrs_only = 0,
287 .ignore_routes_with_linkdown = 0,
288 .keep_addr_on_down = 0,
289 .seg6_enabled = 0,
290 #ifdef CONFIG_IPV6_SEG6_HMAC
291 .seg6_require_hmac = 0,
292 #endif
293 .enhanced_dad = 1,
294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
295 .disable_policy = 0,
296 };
297
298 /* Check if link is ready: is it up and is a valid qdisc available */
299 static inline bool addrconf_link_ready(const struct net_device *dev)
300 {
301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
302 }
303
304 static void addrconf_del_rs_timer(struct inet6_dev *idev)
305 {
306 if (del_timer(&idev->rs_timer))
307 __in6_dev_put(idev);
308 }
309
310 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
311 {
312 if (cancel_delayed_work(&ifp->dad_work))
313 __in6_ifa_put(ifp);
314 }
315
316 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
317 unsigned long when)
318 {
319 if (!timer_pending(&idev->rs_timer))
320 in6_dev_hold(idev);
321 mod_timer(&idev->rs_timer, jiffies + when);
322 }
323
324 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
325 unsigned long delay)
326 {
327 in6_ifa_hold(ifp);
328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
329 in6_ifa_put(ifp);
330 }
331
332 static int snmp6_alloc_dev(struct inet6_dev *idev)
333 {
334 int i;
335
336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
337 if (!idev->stats.ipv6)
338 goto err_ip;
339
340 for_each_possible_cpu(i) {
341 struct ipstats_mib *addrconf_stats;
342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
343 u64_stats_init(&addrconf_stats->syncp);
344 }
345
346
347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
348 GFP_KERNEL);
349 if (!idev->stats.icmpv6dev)
350 goto err_icmp;
351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
352 GFP_KERNEL);
353 if (!idev->stats.icmpv6msgdev)
354 goto err_icmpmsg;
355
356 return 0;
357
358 err_icmpmsg:
359 kfree(idev->stats.icmpv6dev);
360 err_icmp:
361 free_percpu(idev->stats.ipv6);
362 err_ip:
363 return -ENOMEM;
364 }
365
366 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
367 {
368 struct inet6_dev *ndev;
369 int err = -ENOMEM;
370
371 ASSERT_RTNL();
372
373 if (dev->mtu < IPV6_MIN_MTU)
374 return ERR_PTR(-EINVAL);
375
376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
377 if (!ndev)
378 return ERR_PTR(err);
379
380 rwlock_init(&ndev->lock);
381 ndev->dev = dev;
382 INIT_LIST_HEAD(&ndev->addr_list);
383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
385
386 if (ndev->cnf.stable_secret.initialized)
387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
388 else
389 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
390
391 ndev->cnf.mtu6 = dev->mtu;
392 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
393 if (!ndev->nd_parms) {
394 kfree(ndev);
395 return ERR_PTR(err);
396 }
397 if (ndev->cnf.forwarding)
398 dev_disable_lro(dev);
399 /* We refer to the device */
400 dev_hold(dev);
401
402 if (snmp6_alloc_dev(ndev) < 0) {
403 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
404 __func__);
405 neigh_parms_release(&nd_tbl, ndev->nd_parms);
406 dev_put(dev);
407 kfree(ndev);
408 return ERR_PTR(err);
409 }
410
411 if (snmp6_register_dev(ndev) < 0) {
412 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
413 __func__, dev->name);
414 goto err_release;
415 }
416
417 /* One reference from device. */
418 refcount_set(&ndev->refcnt, 1);
419
420 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
421 ndev->cnf.accept_dad = -1;
422
423 #if IS_ENABLED(CONFIG_IPV6_SIT)
424 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
425 pr_info("%s: Disabled Multicast RS\n", dev->name);
426 ndev->cnf.rtr_solicits = 0;
427 }
428 #endif
429
430 INIT_LIST_HEAD(&ndev->tempaddr_list);
431 ndev->desync_factor = U32_MAX;
432 if ((dev->flags&IFF_LOOPBACK) ||
433 dev->type == ARPHRD_TUNNEL ||
434 dev->type == ARPHRD_TUNNEL6 ||
435 dev->type == ARPHRD_SIT ||
436 dev->type == ARPHRD_NONE) {
437 ndev->cnf.use_tempaddr = -1;
438 } else
439 ipv6_regen_rndid(ndev);
440
441 ndev->token = in6addr_any;
442
443 if (netif_running(dev) && addrconf_link_ready(dev))
444 ndev->if_flags |= IF_READY;
445
446 ipv6_mc_init_dev(ndev);
447 ndev->tstamp = jiffies;
448 err = addrconf_sysctl_register(ndev);
449 if (err) {
450 ipv6_mc_destroy_dev(ndev);
451 snmp6_unregister_dev(ndev);
452 goto err_release;
453 }
454 /* protected by rtnl_lock */
455 rcu_assign_pointer(dev->ip6_ptr, ndev);
456
457 /* Join interface-local all-node multicast group */
458 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
459
460 /* Join all-node multicast group */
461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
462
463 /* Join all-router multicast group if forwarding is set */
464 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
465 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
466
467 return ndev;
468
469 err_release:
470 neigh_parms_release(&nd_tbl, ndev->nd_parms);
471 ndev->dead = 1;
472 in6_dev_finish_destroy(ndev);
473 return ERR_PTR(err);
474 }
475
476 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
477 {
478 struct inet6_dev *idev;
479
480 ASSERT_RTNL();
481
482 idev = __in6_dev_get(dev);
483 if (!idev) {
484 idev = ipv6_add_dev(dev);
485 if (IS_ERR(idev))
486 return NULL;
487 }
488
489 if (dev->flags&IFF_UP)
490 ipv6_mc_up(idev);
491 return idev;
492 }
493
494 static int inet6_netconf_msgsize_devconf(int type)
495 {
496 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
497 + nla_total_size(4); /* NETCONFA_IFINDEX */
498 bool all = false;
499
500 if (type == NETCONFA_ALL)
501 all = true;
502
503 if (all || type == NETCONFA_FORWARDING)
504 size += nla_total_size(4);
505 #ifdef CONFIG_IPV6_MROUTE
506 if (all || type == NETCONFA_MC_FORWARDING)
507 size += nla_total_size(4);
508 #endif
509 if (all || type == NETCONFA_PROXY_NEIGH)
510 size += nla_total_size(4);
511
512 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
513 size += nla_total_size(4);
514
515 return size;
516 }
517
518 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
519 struct ipv6_devconf *devconf, u32 portid,
520 u32 seq, int event, unsigned int flags,
521 int type)
522 {
523 struct nlmsghdr *nlh;
524 struct netconfmsg *ncm;
525 bool all = false;
526
527 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
528 flags);
529 if (!nlh)
530 return -EMSGSIZE;
531
532 if (type == NETCONFA_ALL)
533 all = true;
534
535 ncm = nlmsg_data(nlh);
536 ncm->ncm_family = AF_INET6;
537
538 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
539 goto nla_put_failure;
540
541 if (!devconf)
542 goto out;
543
544 if ((all || type == NETCONFA_FORWARDING) &&
545 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
546 goto nla_put_failure;
547 #ifdef CONFIG_IPV6_MROUTE
548 if ((all || type == NETCONFA_MC_FORWARDING) &&
549 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
550 devconf->mc_forwarding) < 0)
551 goto nla_put_failure;
552 #endif
553 if ((all || type == NETCONFA_PROXY_NEIGH) &&
554 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
555 goto nla_put_failure;
556
557 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
558 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
559 devconf->ignore_routes_with_linkdown) < 0)
560 goto nla_put_failure;
561
562 out:
563 nlmsg_end(skb, nlh);
564 return 0;
565
566 nla_put_failure:
567 nlmsg_cancel(skb, nlh);
568 return -EMSGSIZE;
569 }
570
571 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
572 int ifindex, struct ipv6_devconf *devconf)
573 {
574 struct sk_buff *skb;
575 int err = -ENOBUFS;
576
577 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
578 if (!skb)
579 goto errout;
580
581 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
582 event, 0, type);
583 if (err < 0) {
584 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
585 WARN_ON(err == -EMSGSIZE);
586 kfree_skb(skb);
587 goto errout;
588 }
589 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
590 return;
591 errout:
592 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
593 }
594
595 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
596 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
597 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
598 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
599 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
600 };
601
602 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
603 struct nlmsghdr *nlh,
604 struct netlink_ext_ack *extack)
605 {
606 struct net *net = sock_net(in_skb->sk);
607 struct nlattr *tb[NETCONFA_MAX+1];
608 struct inet6_dev *in6_dev = NULL;
609 struct net_device *dev = NULL;
610 struct netconfmsg *ncm;
611 struct sk_buff *skb;
612 struct ipv6_devconf *devconf;
613 int ifindex;
614 int err;
615
616 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
617 devconf_ipv6_policy, extack);
618 if (err < 0)
619 return err;
620
621 if (!tb[NETCONFA_IFINDEX])
622 return -EINVAL;
623
624 err = -EINVAL;
625 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
626 switch (ifindex) {
627 case NETCONFA_IFINDEX_ALL:
628 devconf = net->ipv6.devconf_all;
629 break;
630 case NETCONFA_IFINDEX_DEFAULT:
631 devconf = net->ipv6.devconf_dflt;
632 break;
633 default:
634 dev = dev_get_by_index(net, ifindex);
635 if (!dev)
636 return -EINVAL;
637 in6_dev = in6_dev_get(dev);
638 if (!in6_dev)
639 goto errout;
640 devconf = &in6_dev->cnf;
641 break;
642 }
643
644 err = -ENOBUFS;
645 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
646 if (!skb)
647 goto errout;
648
649 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
650 NETLINK_CB(in_skb).portid,
651 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
652 NETCONFA_ALL);
653 if (err < 0) {
654 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
655 WARN_ON(err == -EMSGSIZE);
656 kfree_skb(skb);
657 goto errout;
658 }
659 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
660 errout:
661 if (in6_dev)
662 in6_dev_put(in6_dev);
663 if (dev)
664 dev_put(dev);
665 return err;
666 }
667
668 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
669 struct netlink_callback *cb)
670 {
671 struct net *net = sock_net(skb->sk);
672 int h, s_h;
673 int idx, s_idx;
674 struct net_device *dev;
675 struct inet6_dev *idev;
676 struct hlist_head *head;
677
678 s_h = cb->args[0];
679 s_idx = idx = cb->args[1];
680
681 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
682 idx = 0;
683 head = &net->dev_index_head[h];
684 rcu_read_lock();
685 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
686 net->dev_base_seq;
687 hlist_for_each_entry_rcu(dev, head, index_hlist) {
688 if (idx < s_idx)
689 goto cont;
690 idev = __in6_dev_get(dev);
691 if (!idev)
692 goto cont;
693
694 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
695 &idev->cnf,
696 NETLINK_CB(cb->skb).portid,
697 cb->nlh->nlmsg_seq,
698 RTM_NEWNETCONF,
699 NLM_F_MULTI,
700 NETCONFA_ALL) < 0) {
701 rcu_read_unlock();
702 goto done;
703 }
704 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
705 cont:
706 idx++;
707 }
708 rcu_read_unlock();
709 }
710 if (h == NETDEV_HASHENTRIES) {
711 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
712 net->ipv6.devconf_all,
713 NETLINK_CB(cb->skb).portid,
714 cb->nlh->nlmsg_seq,
715 RTM_NEWNETCONF, NLM_F_MULTI,
716 NETCONFA_ALL) < 0)
717 goto done;
718 else
719 h++;
720 }
721 if (h == NETDEV_HASHENTRIES + 1) {
722 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
723 net->ipv6.devconf_dflt,
724 NETLINK_CB(cb->skb).portid,
725 cb->nlh->nlmsg_seq,
726 RTM_NEWNETCONF, NLM_F_MULTI,
727 NETCONFA_ALL) < 0)
728 goto done;
729 else
730 h++;
731 }
732 done:
733 cb->args[0] = h;
734 cb->args[1] = idx;
735
736 return skb->len;
737 }
738
739 #ifdef CONFIG_SYSCTL
740 static void dev_forward_change(struct inet6_dev *idev)
741 {
742 struct net_device *dev;
743 struct inet6_ifaddr *ifa;
744
745 if (!idev)
746 return;
747 dev = idev->dev;
748 if (idev->cnf.forwarding)
749 dev_disable_lro(dev);
750 if (dev->flags & IFF_MULTICAST) {
751 if (idev->cnf.forwarding) {
752 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
753 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
754 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
755 } else {
756 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
757 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
758 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
759 }
760 }
761
762 list_for_each_entry(ifa, &idev->addr_list, if_list) {
763 if (ifa->flags&IFA_F_TENTATIVE)
764 continue;
765 if (idev->cnf.forwarding)
766 addrconf_join_anycast(ifa);
767 else
768 addrconf_leave_anycast(ifa);
769 }
770 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
771 NETCONFA_FORWARDING,
772 dev->ifindex, &idev->cnf);
773 }
774
775
776 static void addrconf_forward_change(struct net *net, __s32 newf)
777 {
778 struct net_device *dev;
779 struct inet6_dev *idev;
780
781 for_each_netdev(net, dev) {
782 idev = __in6_dev_get(dev);
783 if (idev) {
784 int changed = (!idev->cnf.forwarding) ^ (!newf);
785 idev->cnf.forwarding = newf;
786 if (changed)
787 dev_forward_change(idev);
788 }
789 }
790 }
791
792 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
793 {
794 struct net *net;
795 int old;
796
797 if (!rtnl_trylock())
798 return restart_syscall();
799
800 net = (struct net *)table->extra2;
801 old = *p;
802 *p = newf;
803
804 if (p == &net->ipv6.devconf_dflt->forwarding) {
805 if ((!newf) ^ (!old))
806 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
807 NETCONFA_FORWARDING,
808 NETCONFA_IFINDEX_DEFAULT,
809 net->ipv6.devconf_dflt);
810 rtnl_unlock();
811 return 0;
812 }
813
814 if (p == &net->ipv6.devconf_all->forwarding) {
815 int old_dflt = net->ipv6.devconf_dflt->forwarding;
816
817 net->ipv6.devconf_dflt->forwarding = newf;
818 if ((!newf) ^ (!old_dflt))
819 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
820 NETCONFA_FORWARDING,
821 NETCONFA_IFINDEX_DEFAULT,
822 net->ipv6.devconf_dflt);
823
824 addrconf_forward_change(net, newf);
825 if ((!newf) ^ (!old))
826 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
827 NETCONFA_FORWARDING,
828 NETCONFA_IFINDEX_ALL,
829 net->ipv6.devconf_all);
830 } else if ((!newf) ^ (!old))
831 dev_forward_change((struct inet6_dev *)table->extra1);
832 rtnl_unlock();
833
834 if (newf)
835 rt6_purge_dflt_routers(net);
836 return 1;
837 }
838
839 static void addrconf_linkdown_change(struct net *net, __s32 newf)
840 {
841 struct net_device *dev;
842 struct inet6_dev *idev;
843
844 for_each_netdev(net, dev) {
845 idev = __in6_dev_get(dev);
846 if (idev) {
847 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
848
849 idev->cnf.ignore_routes_with_linkdown = newf;
850 if (changed)
851 inet6_netconf_notify_devconf(dev_net(dev),
852 RTM_NEWNETCONF,
853 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
854 dev->ifindex,
855 &idev->cnf);
856 }
857 }
858 }
859
860 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
861 {
862 struct net *net;
863 int old;
864
865 if (!rtnl_trylock())
866 return restart_syscall();
867
868 net = (struct net *)table->extra2;
869 old = *p;
870 *p = newf;
871
872 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
873 if ((!newf) ^ (!old))
874 inet6_netconf_notify_devconf(net,
875 RTM_NEWNETCONF,
876 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
877 NETCONFA_IFINDEX_DEFAULT,
878 net->ipv6.devconf_dflt);
879 rtnl_unlock();
880 return 0;
881 }
882
883 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
884 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
885 addrconf_linkdown_change(net, newf);
886 if ((!newf) ^ (!old))
887 inet6_netconf_notify_devconf(net,
888 RTM_NEWNETCONF,
889 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
890 NETCONFA_IFINDEX_ALL,
891 net->ipv6.devconf_all);
892 }
893 rtnl_unlock();
894
895 return 1;
896 }
897
898 #endif
899
900 /* Nobody refers to this ifaddr, destroy it */
901 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
902 {
903 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
904
905 #ifdef NET_REFCNT_DEBUG
906 pr_debug("%s\n", __func__);
907 #endif
908
909 in6_dev_put(ifp->idev);
910
911 if (cancel_delayed_work(&ifp->dad_work))
912 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
913 ifp);
914
915 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
916 pr_warn("Freeing alive inet6 address %p\n", ifp);
917 return;
918 }
919 ip6_rt_put(ifp->rt);
920
921 kfree_rcu(ifp, rcu);
922 }
923
924 static void
925 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
926 {
927 struct list_head *p;
928 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
929
930 /*
931 * Each device address list is sorted in order of scope -
932 * global before linklocal.
933 */
934 list_for_each(p, &idev->addr_list) {
935 struct inet6_ifaddr *ifa
936 = list_entry(p, struct inet6_ifaddr, if_list);
937 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
938 break;
939 }
940
941 list_add_tail_rcu(&ifp->if_list, p);
942 }
943
944 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
945 {
946 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
947
948 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
949 }
950
951 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
952 struct net_device *dev, unsigned int hash)
953 {
954 struct inet6_ifaddr *ifp;
955
956 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
957 if (!net_eq(dev_net(ifp->idev->dev), net))
958 continue;
959 if (ipv6_addr_equal(&ifp->addr, addr)) {
960 if (!dev || ifp->idev->dev == dev)
961 return true;
962 }
963 }
964 return false;
965 }
966
967 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
968 {
969 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
970 int err = 0;
971
972 spin_lock(&addrconf_hash_lock);
973
974 /* Ignore adding duplicate addresses on an interface */
975 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
976 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
977 err = -EEXIST;
978 } else {
979 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
980 }
981
982 spin_unlock(&addrconf_hash_lock);
983
984 return err;
985 }
986
987 /* On success it returns ifp with increased reference count */
988
989 static struct inet6_ifaddr *
990 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
991 const struct in6_addr *peer_addr, int pfxlen,
992 int scope, u32 flags, u32 valid_lft, u32 prefered_lft,
993 bool can_block, struct netlink_ext_ack *extack)
994 {
995 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
996 struct net *net = dev_net(idev->dev);
997 struct inet6_ifaddr *ifa = NULL;
998 struct rt6_info *rt = NULL;
999 int err = 0;
1000 int addr_type = ipv6_addr_type(addr);
1001
1002 if (addr_type == IPV6_ADDR_ANY ||
1003 addr_type & IPV6_ADDR_MULTICAST ||
1004 (!(idev->dev->flags & IFF_LOOPBACK) &&
1005 addr_type & IPV6_ADDR_LOOPBACK))
1006 return ERR_PTR(-EADDRNOTAVAIL);
1007
1008 if (idev->dead) {
1009 err = -ENODEV; /*XXX*/
1010 goto out;
1011 }
1012
1013 if (idev->cnf.disable_ipv6) {
1014 err = -EACCES;
1015 goto out;
1016 }
1017
1018 /* validator notifier needs to be blocking;
1019 * do not call in atomic context
1020 */
1021 if (can_block) {
1022 struct in6_validator_info i6vi = {
1023 .i6vi_addr = *addr,
1024 .i6vi_dev = idev,
1025 .extack = extack,
1026 };
1027
1028 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1029 err = notifier_to_errno(err);
1030 if (err < 0)
1031 goto out;
1032 }
1033
1034 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1035 if (!ifa) {
1036 err = -ENOBUFS;
1037 goto out;
1038 }
1039
1040 rt = addrconf_dst_alloc(idev, addr, false);
1041 if (IS_ERR(rt)) {
1042 err = PTR_ERR(rt);
1043 rt = NULL;
1044 goto out;
1045 }
1046
1047 if (net->ipv6.devconf_all->disable_policy ||
1048 idev->cnf.disable_policy)
1049 rt->dst.flags |= DST_NOPOLICY;
1050
1051 neigh_parms_data_state_setall(idev->nd_parms);
1052
1053 ifa->addr = *addr;
1054 if (peer_addr)
1055 ifa->peer_addr = *peer_addr;
1056
1057 spin_lock_init(&ifa->lock);
1058 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1059 INIT_HLIST_NODE(&ifa->addr_lst);
1060 ifa->scope = scope;
1061 ifa->prefix_len = pfxlen;
1062 ifa->flags = flags;
1063 /* No need to add the TENTATIVE flag for addresses with NODAD */
1064 if (!(flags & IFA_F_NODAD))
1065 ifa->flags |= IFA_F_TENTATIVE;
1066 ifa->valid_lft = valid_lft;
1067 ifa->prefered_lft = prefered_lft;
1068 ifa->cstamp = ifa->tstamp = jiffies;
1069 ifa->tokenized = false;
1070
1071 ifa->rt = rt;
1072
1073 ifa->idev = idev;
1074 in6_dev_hold(idev);
1075
1076 /* For caller */
1077 refcount_set(&ifa->refcnt, 1);
1078
1079 rcu_read_lock_bh();
1080
1081 err = ipv6_add_addr_hash(idev->dev, ifa);
1082 if (err < 0) {
1083 rcu_read_unlock_bh();
1084 goto out;
1085 }
1086
1087 write_lock(&idev->lock);
1088
1089 /* Add to inet6_dev unicast addr list. */
1090 ipv6_link_dev_addr(idev, ifa);
1091
1092 if (ifa->flags&IFA_F_TEMPORARY) {
1093 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1094 in6_ifa_hold(ifa);
1095 }
1096
1097 in6_ifa_hold(ifa);
1098 write_unlock(&idev->lock);
1099
1100 rcu_read_unlock_bh();
1101
1102 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1103 out:
1104 if (unlikely(err < 0)) {
1105 if (rt)
1106 ip6_rt_put(rt);
1107 if (ifa) {
1108 if (ifa->idev)
1109 in6_dev_put(ifa->idev);
1110 kfree(ifa);
1111 }
1112 ifa = ERR_PTR(err);
1113 }
1114
1115 return ifa;
1116 }
1117
1118 enum cleanup_prefix_rt_t {
1119 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1120 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1121 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1122 };
1123
1124 /*
1125 * Check, whether the prefix for ifp would still need a prefix route
1126 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1127 * constants.
1128 *
1129 * 1) we don't purge prefix if address was not permanent.
1130 * prefix is managed by its own lifetime.
1131 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1132 * 3) if there are no addresses, delete prefix.
1133 * 4) if there are still other permanent address(es),
1134 * corresponding prefix is still permanent.
1135 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1136 * don't purge the prefix, assume user space is managing it.
1137 * 6) otherwise, update prefix lifetime to the
1138 * longest valid lifetime among the corresponding
1139 * addresses on the device.
1140 * Note: subsequent RA will update lifetime.
1141 **/
1142 static enum cleanup_prefix_rt_t
1143 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1144 {
1145 struct inet6_ifaddr *ifa;
1146 struct inet6_dev *idev = ifp->idev;
1147 unsigned long lifetime;
1148 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1149
1150 *expires = jiffies;
1151
1152 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1153 if (ifa == ifp)
1154 continue;
1155 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1156 ifp->prefix_len))
1157 continue;
1158 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1159 return CLEANUP_PREFIX_RT_NOP;
1160
1161 action = CLEANUP_PREFIX_RT_EXPIRE;
1162
1163 spin_lock(&ifa->lock);
1164
1165 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1166 /*
1167 * Note: Because this address is
1168 * not permanent, lifetime <
1169 * LONG_MAX / HZ here.
1170 */
1171 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1172 *expires = ifa->tstamp + lifetime * HZ;
1173 spin_unlock(&ifa->lock);
1174 }
1175
1176 return action;
1177 }
1178
1179 static void
1180 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1181 {
1182 struct rt6_info *rt;
1183
1184 rt = addrconf_get_prefix_route(&ifp->addr,
1185 ifp->prefix_len,
1186 ifp->idev->dev,
1187 0, RTF_GATEWAY | RTF_DEFAULT);
1188 if (rt) {
1189 if (del_rt)
1190 ip6_del_rt(rt);
1191 else {
1192 if (!(rt->rt6i_flags & RTF_EXPIRES))
1193 rt6_set_expires(rt, expires);
1194 ip6_rt_put(rt);
1195 }
1196 }
1197 }
1198
1199
1200 /* This function wants to get referenced ifp and releases it before return */
1201
1202 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1203 {
1204 int state;
1205 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1206 unsigned long expires;
1207
1208 ASSERT_RTNL();
1209
1210 spin_lock_bh(&ifp->lock);
1211 state = ifp->state;
1212 ifp->state = INET6_IFADDR_STATE_DEAD;
1213 spin_unlock_bh(&ifp->lock);
1214
1215 if (state == INET6_IFADDR_STATE_DEAD)
1216 goto out;
1217
1218 spin_lock_bh(&addrconf_hash_lock);
1219 hlist_del_init_rcu(&ifp->addr_lst);
1220 spin_unlock_bh(&addrconf_hash_lock);
1221
1222 write_lock_bh(&ifp->idev->lock);
1223
1224 if (ifp->flags&IFA_F_TEMPORARY) {
1225 list_del(&ifp->tmp_list);
1226 if (ifp->ifpub) {
1227 in6_ifa_put(ifp->ifpub);
1228 ifp->ifpub = NULL;
1229 }
1230 __in6_ifa_put(ifp);
1231 }
1232
1233 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1234 action = check_cleanup_prefix_route(ifp, &expires);
1235
1236 list_del_rcu(&ifp->if_list);
1237 __in6_ifa_put(ifp);
1238
1239 write_unlock_bh(&ifp->idev->lock);
1240
1241 addrconf_del_dad_work(ifp);
1242
1243 ipv6_ifa_notify(RTM_DELADDR, ifp);
1244
1245 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1246
1247 if (action != CLEANUP_PREFIX_RT_NOP) {
1248 cleanup_prefix_route(ifp, expires,
1249 action == CLEANUP_PREFIX_RT_DEL);
1250 }
1251
1252 /* clean up prefsrc entries */
1253 rt6_remove_prefsrc(ifp);
1254 out:
1255 in6_ifa_put(ifp);
1256 }
1257
1258 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1259 struct inet6_ifaddr *ift,
1260 bool block)
1261 {
1262 struct inet6_dev *idev = ifp->idev;
1263 struct in6_addr addr, *tmpaddr;
1264 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1265 unsigned long regen_advance;
1266 int tmp_plen;
1267 int ret = 0;
1268 u32 addr_flags;
1269 unsigned long now = jiffies;
1270 long max_desync_factor;
1271 s32 cnf_temp_preferred_lft;
1272
1273 write_lock_bh(&idev->lock);
1274 if (ift) {
1275 spin_lock_bh(&ift->lock);
1276 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1277 spin_unlock_bh(&ift->lock);
1278 tmpaddr = &addr;
1279 } else {
1280 tmpaddr = NULL;
1281 }
1282 retry:
1283 in6_dev_hold(idev);
1284 if (idev->cnf.use_tempaddr <= 0) {
1285 write_unlock_bh(&idev->lock);
1286 pr_info("%s: use_tempaddr is disabled\n", __func__);
1287 in6_dev_put(idev);
1288 ret = -1;
1289 goto out;
1290 }
1291 spin_lock_bh(&ifp->lock);
1292 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1293 idev->cnf.use_tempaddr = -1; /*XXX*/
1294 spin_unlock_bh(&ifp->lock);
1295 write_unlock_bh(&idev->lock);
1296 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1297 __func__);
1298 in6_dev_put(idev);
1299 ret = -1;
1300 goto out;
1301 }
1302 in6_ifa_hold(ifp);
1303 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1304 ipv6_try_regen_rndid(idev, tmpaddr);
1305 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1306 age = (now - ifp->tstamp) / HZ;
1307
1308 regen_advance = idev->cnf.regen_max_retry *
1309 idev->cnf.dad_transmits *
1310 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1311
1312 /* recalculate max_desync_factor each time and update
1313 * idev->desync_factor if it's larger
1314 */
1315 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1316 max_desync_factor = min_t(__u32,
1317 idev->cnf.max_desync_factor,
1318 cnf_temp_preferred_lft - regen_advance);
1319
1320 if (unlikely(idev->desync_factor > max_desync_factor)) {
1321 if (max_desync_factor > 0) {
1322 get_random_bytes(&idev->desync_factor,
1323 sizeof(idev->desync_factor));
1324 idev->desync_factor %= max_desync_factor;
1325 } else {
1326 idev->desync_factor = 0;
1327 }
1328 }
1329
1330 tmp_valid_lft = min_t(__u32,
1331 ifp->valid_lft,
1332 idev->cnf.temp_valid_lft + age);
1333 tmp_prefered_lft = cnf_temp_preferred_lft + age -
1334 idev->desync_factor;
1335 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1336 tmp_plen = ifp->prefix_len;
1337 tmp_tstamp = ifp->tstamp;
1338 spin_unlock_bh(&ifp->lock);
1339
1340 write_unlock_bh(&idev->lock);
1341
1342 /* A temporary address is created only if this calculated Preferred
1343 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1344 * an implementation must not create a temporary address with a zero
1345 * Preferred Lifetime.
1346 * Use age calculation as in addrconf_verify to avoid unnecessary
1347 * temporary addresses being generated.
1348 */
1349 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1350 if (tmp_prefered_lft <= regen_advance + age) {
1351 in6_ifa_put(ifp);
1352 in6_dev_put(idev);
1353 ret = -1;
1354 goto out;
1355 }
1356
1357 addr_flags = IFA_F_TEMPORARY;
1358 /* set in addrconf_prefix_rcv() */
1359 if (ifp->flags & IFA_F_OPTIMISTIC)
1360 addr_flags |= IFA_F_OPTIMISTIC;
1361
1362 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1363 ipv6_addr_scope(&addr), addr_flags,
1364 tmp_valid_lft, tmp_prefered_lft, block, NULL);
1365 if (IS_ERR(ift)) {
1366 in6_ifa_put(ifp);
1367 in6_dev_put(idev);
1368 pr_info("%s: retry temporary address regeneration\n", __func__);
1369 tmpaddr = &addr;
1370 write_lock_bh(&idev->lock);
1371 goto retry;
1372 }
1373
1374 spin_lock_bh(&ift->lock);
1375 ift->ifpub = ifp;
1376 ift->cstamp = now;
1377 ift->tstamp = tmp_tstamp;
1378 spin_unlock_bh(&ift->lock);
1379
1380 addrconf_dad_start(ift);
1381 in6_ifa_put(ift);
1382 in6_dev_put(idev);
1383 out:
1384 return ret;
1385 }
1386
1387 /*
1388 * Choose an appropriate source address (RFC3484)
1389 */
1390 enum {
1391 IPV6_SADDR_RULE_INIT = 0,
1392 IPV6_SADDR_RULE_LOCAL,
1393 IPV6_SADDR_RULE_SCOPE,
1394 IPV6_SADDR_RULE_PREFERRED,
1395 #ifdef CONFIG_IPV6_MIP6
1396 IPV6_SADDR_RULE_HOA,
1397 #endif
1398 IPV6_SADDR_RULE_OIF,
1399 IPV6_SADDR_RULE_LABEL,
1400 IPV6_SADDR_RULE_PRIVACY,
1401 IPV6_SADDR_RULE_ORCHID,
1402 IPV6_SADDR_RULE_PREFIX,
1403 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1404 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1405 #endif
1406 IPV6_SADDR_RULE_MAX
1407 };
1408
1409 struct ipv6_saddr_score {
1410 int rule;
1411 int addr_type;
1412 struct inet6_ifaddr *ifa;
1413 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1414 int scopedist;
1415 int matchlen;
1416 };
1417
1418 struct ipv6_saddr_dst {
1419 const struct in6_addr *addr;
1420 int ifindex;
1421 int scope;
1422 int label;
1423 unsigned int prefs;
1424 };
1425
1426 static inline int ipv6_saddr_preferred(int type)
1427 {
1428 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1429 return 1;
1430 return 0;
1431 }
1432
1433 static bool ipv6_use_optimistic_addr(struct net *net,
1434 struct inet6_dev *idev)
1435 {
1436 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1437 if (!idev)
1438 return false;
1439 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1440 return false;
1441 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1442 return false;
1443
1444 return true;
1445 #else
1446 return false;
1447 #endif
1448 }
1449
1450 static bool ipv6_allow_optimistic_dad(struct net *net,
1451 struct inet6_dev *idev)
1452 {
1453 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1454 if (!idev)
1455 return false;
1456 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1457 return false;
1458
1459 return true;
1460 #else
1461 return false;
1462 #endif
1463 }
1464
1465 static int ipv6_get_saddr_eval(struct net *net,
1466 struct ipv6_saddr_score *score,
1467 struct ipv6_saddr_dst *dst,
1468 int i)
1469 {
1470 int ret;
1471
1472 if (i <= score->rule) {
1473 switch (i) {
1474 case IPV6_SADDR_RULE_SCOPE:
1475 ret = score->scopedist;
1476 break;
1477 case IPV6_SADDR_RULE_PREFIX:
1478 ret = score->matchlen;
1479 break;
1480 default:
1481 ret = !!test_bit(i, score->scorebits);
1482 }
1483 goto out;
1484 }
1485
1486 switch (i) {
1487 case IPV6_SADDR_RULE_INIT:
1488 /* Rule 0: remember if hiscore is not ready yet */
1489 ret = !!score->ifa;
1490 break;
1491 case IPV6_SADDR_RULE_LOCAL:
1492 /* Rule 1: Prefer same address */
1493 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1494 break;
1495 case IPV6_SADDR_RULE_SCOPE:
1496 /* Rule 2: Prefer appropriate scope
1497 *
1498 * ret
1499 * ^
1500 * -1 | d 15
1501 * ---+--+-+---> scope
1502 * |
1503 * | d is scope of the destination.
1504 * B-d | \
1505 * | \ <- smaller scope is better if
1506 * B-15 | \ if scope is enough for destination.
1507 * | ret = B - scope (-1 <= scope >= d <= 15).
1508 * d-C-1 | /
1509 * |/ <- greater is better
1510 * -C / if scope is not enough for destination.
1511 * /| ret = scope - C (-1 <= d < scope <= 15).
1512 *
1513 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1514 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1515 * Assume B = 0 and we get C > 29.
1516 */
1517 ret = __ipv6_addr_src_scope(score->addr_type);
1518 if (ret >= dst->scope)
1519 ret = -ret;
1520 else
1521 ret -= 128; /* 30 is enough */
1522 score->scopedist = ret;
1523 break;
1524 case IPV6_SADDR_RULE_PREFERRED:
1525 {
1526 /* Rule 3: Avoid deprecated and optimistic addresses */
1527 u8 avoid = IFA_F_DEPRECATED;
1528
1529 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1530 avoid |= IFA_F_OPTIMISTIC;
1531 ret = ipv6_saddr_preferred(score->addr_type) ||
1532 !(score->ifa->flags & avoid);
1533 break;
1534 }
1535 #ifdef CONFIG_IPV6_MIP6
1536 case IPV6_SADDR_RULE_HOA:
1537 {
1538 /* Rule 4: Prefer home address */
1539 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1540 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1541 break;
1542 }
1543 #endif
1544 case IPV6_SADDR_RULE_OIF:
1545 /* Rule 5: Prefer outgoing interface */
1546 ret = (!dst->ifindex ||
1547 dst->ifindex == score->ifa->idev->dev->ifindex);
1548 break;
1549 case IPV6_SADDR_RULE_LABEL:
1550 /* Rule 6: Prefer matching label */
1551 ret = ipv6_addr_label(net,
1552 &score->ifa->addr, score->addr_type,
1553 score->ifa->idev->dev->ifindex) == dst->label;
1554 break;
1555 case IPV6_SADDR_RULE_PRIVACY:
1556 {
1557 /* Rule 7: Prefer public address
1558 * Note: prefer temporary address if use_tempaddr >= 2
1559 */
1560 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1561 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1562 score->ifa->idev->cnf.use_tempaddr >= 2;
1563 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1564 break;
1565 }
1566 case IPV6_SADDR_RULE_ORCHID:
1567 /* Rule 8-: Prefer ORCHID vs ORCHID or
1568 * non-ORCHID vs non-ORCHID
1569 */
1570 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1571 ipv6_addr_orchid(dst->addr));
1572 break;
1573 case IPV6_SADDR_RULE_PREFIX:
1574 /* Rule 8: Use longest matching prefix */
1575 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1576 if (ret > score->ifa->prefix_len)
1577 ret = score->ifa->prefix_len;
1578 score->matchlen = ret;
1579 break;
1580 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1581 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1582 /* Optimistic addresses still have lower precedence than other
1583 * preferred addresses.
1584 */
1585 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1586 break;
1587 #endif
1588 default:
1589 ret = 0;
1590 }
1591
1592 if (ret)
1593 __set_bit(i, score->scorebits);
1594 score->rule = i;
1595 out:
1596 return ret;
1597 }
1598
1599 static int __ipv6_dev_get_saddr(struct net *net,
1600 struct ipv6_saddr_dst *dst,
1601 struct inet6_dev *idev,
1602 struct ipv6_saddr_score *scores,
1603 int hiscore_idx)
1604 {
1605 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1606
1607 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1608 int i;
1609
1610 /*
1611 * - Tentative Address (RFC2462 section 5.4)
1612 * - A tentative address is not considered
1613 * "assigned to an interface" in the traditional
1614 * sense, unless it is also flagged as optimistic.
1615 * - Candidate Source Address (section 4)
1616 * - In any case, anycast addresses, multicast
1617 * addresses, and the unspecified address MUST
1618 * NOT be included in a candidate set.
1619 */
1620 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1621 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1622 continue;
1623
1624 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1625
1626 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1627 score->addr_type & IPV6_ADDR_MULTICAST)) {
1628 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1629 idev->dev->name);
1630 continue;
1631 }
1632
1633 score->rule = -1;
1634 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1635
1636 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1637 int minihiscore, miniscore;
1638
1639 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1640 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1641
1642 if (minihiscore > miniscore) {
1643 if (i == IPV6_SADDR_RULE_SCOPE &&
1644 score->scopedist > 0) {
1645 /*
1646 * special case:
1647 * each remaining entry
1648 * has too small (not enough)
1649 * scope, because ifa entries
1650 * are sorted by their scope
1651 * values.
1652 */
1653 goto out;
1654 }
1655 break;
1656 } else if (minihiscore < miniscore) {
1657 swap(hiscore, score);
1658 hiscore_idx = 1 - hiscore_idx;
1659
1660 /* restore our iterator */
1661 score->ifa = hiscore->ifa;
1662
1663 break;
1664 }
1665 }
1666 }
1667 out:
1668 return hiscore_idx;
1669 }
1670
1671 static int ipv6_get_saddr_master(struct net *net,
1672 const struct net_device *dst_dev,
1673 const struct net_device *master,
1674 struct ipv6_saddr_dst *dst,
1675 struct ipv6_saddr_score *scores,
1676 int hiscore_idx)
1677 {
1678 struct inet6_dev *idev;
1679
1680 idev = __in6_dev_get(dst_dev);
1681 if (idev)
1682 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1683 scores, hiscore_idx);
1684
1685 idev = __in6_dev_get(master);
1686 if (idev)
1687 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1688 scores, hiscore_idx);
1689
1690 return hiscore_idx;
1691 }
1692
1693 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1694 const struct in6_addr *daddr, unsigned int prefs,
1695 struct in6_addr *saddr)
1696 {
1697 struct ipv6_saddr_score scores[2], *hiscore;
1698 struct ipv6_saddr_dst dst;
1699 struct inet6_dev *idev;
1700 struct net_device *dev;
1701 int dst_type;
1702 bool use_oif_addr = false;
1703 int hiscore_idx = 0;
1704 int ret = 0;
1705
1706 dst_type = __ipv6_addr_type(daddr);
1707 dst.addr = daddr;
1708 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1709 dst.scope = __ipv6_addr_src_scope(dst_type);
1710 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1711 dst.prefs = prefs;
1712
1713 scores[hiscore_idx].rule = -1;
1714 scores[hiscore_idx].ifa = NULL;
1715
1716 rcu_read_lock();
1717
1718 /* Candidate Source Address (section 4)
1719 * - multicast and link-local destination address,
1720 * the set of candidate source address MUST only
1721 * include addresses assigned to interfaces
1722 * belonging to the same link as the outgoing
1723 * interface.
1724 * (- For site-local destination addresses, the
1725 * set of candidate source addresses MUST only
1726 * include addresses assigned to interfaces
1727 * belonging to the same site as the outgoing
1728 * interface.)
1729 * - "It is RECOMMENDED that the candidate source addresses
1730 * be the set of unicast addresses assigned to the
1731 * interface that will be used to send to the destination
1732 * (the 'outgoing' interface)." (RFC 6724)
1733 */
1734 if (dst_dev) {
1735 idev = __in6_dev_get(dst_dev);
1736 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1737 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1738 (idev && idev->cnf.use_oif_addrs_only)) {
1739 use_oif_addr = true;
1740 }
1741 }
1742
1743 if (use_oif_addr) {
1744 if (idev)
1745 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1746 } else {
1747 const struct net_device *master;
1748 int master_idx = 0;
1749
1750 /* if dst_dev exists and is enslaved to an L3 device, then
1751 * prefer addresses from dst_dev and then the master over
1752 * any other enslaved devices in the L3 domain.
1753 */
1754 master = l3mdev_master_dev_rcu(dst_dev);
1755 if (master) {
1756 master_idx = master->ifindex;
1757
1758 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1759 master, &dst,
1760 scores, hiscore_idx);
1761
1762 if (scores[hiscore_idx].ifa)
1763 goto out;
1764 }
1765
1766 for_each_netdev_rcu(net, dev) {
1767 /* only consider addresses on devices in the
1768 * same L3 domain
1769 */
1770 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1771 continue;
1772 idev = __in6_dev_get(dev);
1773 if (!idev)
1774 continue;
1775 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1776 }
1777 }
1778
1779 out:
1780 hiscore = &scores[hiscore_idx];
1781 if (!hiscore->ifa)
1782 ret = -EADDRNOTAVAIL;
1783 else
1784 *saddr = hiscore->ifa->addr;
1785
1786 rcu_read_unlock();
1787 return ret;
1788 }
1789 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1790
1791 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1792 u32 banned_flags)
1793 {
1794 struct inet6_ifaddr *ifp;
1795 int err = -EADDRNOTAVAIL;
1796
1797 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1798 if (ifp->scope > IFA_LINK)
1799 break;
1800 if (ifp->scope == IFA_LINK &&
1801 !(ifp->flags & banned_flags)) {
1802 *addr = ifp->addr;
1803 err = 0;
1804 break;
1805 }
1806 }
1807 return err;
1808 }
1809
1810 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1811 u32 banned_flags)
1812 {
1813 struct inet6_dev *idev;
1814 int err = -EADDRNOTAVAIL;
1815
1816 rcu_read_lock();
1817 idev = __in6_dev_get(dev);
1818 if (idev) {
1819 read_lock_bh(&idev->lock);
1820 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1821 read_unlock_bh(&idev->lock);
1822 }
1823 rcu_read_unlock();
1824 return err;
1825 }
1826
1827 static int ipv6_count_addresses(const struct inet6_dev *idev)
1828 {
1829 const struct inet6_ifaddr *ifp;
1830 int cnt = 0;
1831
1832 rcu_read_lock();
1833 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1834 cnt++;
1835 rcu_read_unlock();
1836 return cnt;
1837 }
1838
1839 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1840 const struct net_device *dev, int strict)
1841 {
1842 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1843 strict, IFA_F_TENTATIVE);
1844 }
1845 EXPORT_SYMBOL(ipv6_chk_addr);
1846
1847 /* device argument is used to find the L3 domain of interest. If
1848 * skip_dev_check is set, then the ifp device is not checked against
1849 * the passed in dev argument. So the 2 cases for addresses checks are:
1850 * 1. does the address exist in the L3 domain that dev is part of
1851 * (skip_dev_check = true), or
1852 *
1853 * 2. does the address exist on the specific device
1854 * (skip_dev_check = false)
1855 */
1856 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1857 const struct net_device *dev, bool skip_dev_check,
1858 int strict, u32 banned_flags)
1859 {
1860 unsigned int hash = inet6_addr_hash(net, addr);
1861 const struct net_device *l3mdev;
1862 struct inet6_ifaddr *ifp;
1863 u32 ifp_flags;
1864
1865 rcu_read_lock();
1866
1867 l3mdev = l3mdev_master_dev_rcu(dev);
1868 if (skip_dev_check)
1869 dev = NULL;
1870
1871 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1872 if (!net_eq(dev_net(ifp->idev->dev), net))
1873 continue;
1874
1875 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1876 continue;
1877
1878 /* Decouple optimistic from tentative for evaluation here.
1879 * Ban optimistic addresses explicitly, when required.
1880 */
1881 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1882 ? (ifp->flags&~IFA_F_TENTATIVE)
1883 : ifp->flags;
1884 if (ipv6_addr_equal(&ifp->addr, addr) &&
1885 !(ifp_flags&banned_flags) &&
1886 (!dev || ifp->idev->dev == dev ||
1887 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1888 rcu_read_unlock();
1889 return 1;
1890 }
1891 }
1892
1893 rcu_read_unlock();
1894 return 0;
1895 }
1896 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1897
1898
1899 /* Compares an address/prefix_len with addresses on device @dev.
1900 * If one is found it returns true.
1901 */
1902 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1903 const unsigned int prefix_len, struct net_device *dev)
1904 {
1905 const struct inet6_ifaddr *ifa;
1906 const struct inet6_dev *idev;
1907 bool ret = false;
1908
1909 rcu_read_lock();
1910 idev = __in6_dev_get(dev);
1911 if (idev) {
1912 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1913 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1914 if (ret)
1915 break;
1916 }
1917 }
1918 rcu_read_unlock();
1919
1920 return ret;
1921 }
1922 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1923
1924 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1925 {
1926 const struct inet6_ifaddr *ifa;
1927 const struct inet6_dev *idev;
1928 int onlink;
1929
1930 onlink = 0;
1931 rcu_read_lock();
1932 idev = __in6_dev_get(dev);
1933 if (idev) {
1934 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1935 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1936 ifa->prefix_len);
1937 if (onlink)
1938 break;
1939 }
1940 }
1941 rcu_read_unlock();
1942 return onlink;
1943 }
1944 EXPORT_SYMBOL(ipv6_chk_prefix);
1945
1946 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1947 struct net_device *dev, int strict)
1948 {
1949 unsigned int hash = inet6_addr_hash(net, addr);
1950 struct inet6_ifaddr *ifp, *result = NULL;
1951
1952 rcu_read_lock();
1953 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1954 if (!net_eq(dev_net(ifp->idev->dev), net))
1955 continue;
1956 if (ipv6_addr_equal(&ifp->addr, addr)) {
1957 if (!dev || ifp->idev->dev == dev ||
1958 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1959 result = ifp;
1960 in6_ifa_hold(ifp);
1961 break;
1962 }
1963 }
1964 }
1965 rcu_read_unlock();
1966
1967 return result;
1968 }
1969
1970 /* Gets referenced address, destroys ifaddr */
1971
1972 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1973 {
1974 if (dad_failed)
1975 ifp->flags |= IFA_F_DADFAILED;
1976
1977 if (ifp->flags&IFA_F_TEMPORARY) {
1978 struct inet6_ifaddr *ifpub;
1979 spin_lock_bh(&ifp->lock);
1980 ifpub = ifp->ifpub;
1981 if (ifpub) {
1982 in6_ifa_hold(ifpub);
1983 spin_unlock_bh(&ifp->lock);
1984 ipv6_create_tempaddr(ifpub, ifp, true);
1985 in6_ifa_put(ifpub);
1986 } else {
1987 spin_unlock_bh(&ifp->lock);
1988 }
1989 ipv6_del_addr(ifp);
1990 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1991 spin_lock_bh(&ifp->lock);
1992 addrconf_del_dad_work(ifp);
1993 ifp->flags |= IFA_F_TENTATIVE;
1994 if (dad_failed)
1995 ifp->flags &= ~IFA_F_OPTIMISTIC;
1996 spin_unlock_bh(&ifp->lock);
1997 if (dad_failed)
1998 ipv6_ifa_notify(0, ifp);
1999 in6_ifa_put(ifp);
2000 } else {
2001 ipv6_del_addr(ifp);
2002 }
2003 }
2004
2005 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2006 {
2007 int err = -ENOENT;
2008
2009 spin_lock_bh(&ifp->lock);
2010 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2011 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2012 err = 0;
2013 }
2014 spin_unlock_bh(&ifp->lock);
2015
2016 return err;
2017 }
2018
2019 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2020 {
2021 struct inet6_dev *idev = ifp->idev;
2022 struct net *net = dev_net(ifp->idev->dev);
2023
2024 if (addrconf_dad_end(ifp)) {
2025 in6_ifa_put(ifp);
2026 return;
2027 }
2028
2029 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2030 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2031
2032 spin_lock_bh(&ifp->lock);
2033
2034 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2035 int scope = ifp->scope;
2036 u32 flags = ifp->flags;
2037 struct in6_addr new_addr;
2038 struct inet6_ifaddr *ifp2;
2039 u32 valid_lft, preferred_lft;
2040 int pfxlen = ifp->prefix_len;
2041 int retries = ifp->stable_privacy_retry + 1;
2042
2043 if (retries > net->ipv6.sysctl.idgen_retries) {
2044 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2045 ifp->idev->dev->name);
2046 goto errdad;
2047 }
2048
2049 new_addr = ifp->addr;
2050 if (ipv6_generate_stable_address(&new_addr, retries,
2051 idev))
2052 goto errdad;
2053
2054 valid_lft = ifp->valid_lft;
2055 preferred_lft = ifp->prefered_lft;
2056
2057 spin_unlock_bh(&ifp->lock);
2058
2059 if (idev->cnf.max_addresses &&
2060 ipv6_count_addresses(idev) >=
2061 idev->cnf.max_addresses)
2062 goto lock_errdad;
2063
2064 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2065 ifp->idev->dev->name);
2066
2067 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2068 scope, flags, valid_lft,
2069 preferred_lft, false, NULL);
2070 if (IS_ERR(ifp2))
2071 goto lock_errdad;
2072
2073 spin_lock_bh(&ifp2->lock);
2074 ifp2->stable_privacy_retry = retries;
2075 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2076 spin_unlock_bh(&ifp2->lock);
2077
2078 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2079 in6_ifa_put(ifp2);
2080 lock_errdad:
2081 spin_lock_bh(&ifp->lock);
2082 }
2083
2084 errdad:
2085 /* transition from _POSTDAD to _ERRDAD */
2086 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2087 spin_unlock_bh(&ifp->lock);
2088
2089 addrconf_mod_dad_work(ifp, 0);
2090 in6_ifa_put(ifp);
2091 }
2092
2093 /* Join to solicited addr multicast group.
2094 * caller must hold RTNL */
2095 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2096 {
2097 struct in6_addr maddr;
2098
2099 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2100 return;
2101
2102 addrconf_addr_solict_mult(addr, &maddr);
2103 ipv6_dev_mc_inc(dev, &maddr);
2104 }
2105
2106 /* caller must hold RTNL */
2107 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2108 {
2109 struct in6_addr maddr;
2110
2111 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2112 return;
2113
2114 addrconf_addr_solict_mult(addr, &maddr);
2115 __ipv6_dev_mc_dec(idev, &maddr);
2116 }
2117
2118 /* caller must hold RTNL */
2119 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2120 {
2121 struct in6_addr addr;
2122
2123 if (ifp->prefix_len >= 127) /* RFC 6164 */
2124 return;
2125 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2126 if (ipv6_addr_any(&addr))
2127 return;
2128 __ipv6_dev_ac_inc(ifp->idev, &addr);
2129 }
2130
2131 /* caller must hold RTNL */
2132 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2133 {
2134 struct in6_addr addr;
2135
2136 if (ifp->prefix_len >= 127) /* RFC 6164 */
2137 return;
2138 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2139 if (ipv6_addr_any(&addr))
2140 return;
2141 __ipv6_dev_ac_dec(ifp->idev, &addr);
2142 }
2143
2144 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2145 {
2146 switch (dev->addr_len) {
2147 case ETH_ALEN:
2148 memcpy(eui, dev->dev_addr, 3);
2149 eui[3] = 0xFF;
2150 eui[4] = 0xFE;
2151 memcpy(eui + 5, dev->dev_addr + 3, 3);
2152 break;
2153 case EUI64_ADDR_LEN:
2154 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2155 eui[0] ^= 2;
2156 break;
2157 default:
2158 return -1;
2159 }
2160
2161 return 0;
2162 }
2163
2164 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2165 {
2166 union fwnet_hwaddr *ha;
2167
2168 if (dev->addr_len != FWNET_ALEN)
2169 return -1;
2170
2171 ha = (union fwnet_hwaddr *)dev->dev_addr;
2172
2173 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2174 eui[0] ^= 2;
2175 return 0;
2176 }
2177
2178 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2179 {
2180 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2181 if (dev->addr_len != ARCNET_ALEN)
2182 return -1;
2183 memset(eui, 0, 7);
2184 eui[7] = *(u8 *)dev->dev_addr;
2185 return 0;
2186 }
2187
2188 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2189 {
2190 if (dev->addr_len != INFINIBAND_ALEN)
2191 return -1;
2192 memcpy(eui, dev->dev_addr + 12, 8);
2193 eui[0] |= 2;
2194 return 0;
2195 }
2196
2197 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2198 {
2199 if (addr == 0)
2200 return -1;
2201 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2202 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2203 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2204 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2205 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2206 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2207 eui[1] = 0;
2208 eui[2] = 0x5E;
2209 eui[3] = 0xFE;
2210 memcpy(eui + 4, &addr, 4);
2211 return 0;
2212 }
2213
2214 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2215 {
2216 if (dev->priv_flags & IFF_ISATAP)
2217 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2218 return -1;
2219 }
2220
2221 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2222 {
2223 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2224 }
2225
2226 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2227 {
2228 memcpy(eui, dev->perm_addr, 3);
2229 memcpy(eui + 5, dev->perm_addr + 3, 3);
2230 eui[3] = 0xFF;
2231 eui[4] = 0xFE;
2232 eui[0] ^= 2;
2233 return 0;
2234 }
2235
2236 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2237 {
2238 switch (dev->type) {
2239 case ARPHRD_ETHER:
2240 case ARPHRD_FDDI:
2241 return addrconf_ifid_eui48(eui, dev);
2242 case ARPHRD_ARCNET:
2243 return addrconf_ifid_arcnet(eui, dev);
2244 case ARPHRD_INFINIBAND:
2245 return addrconf_ifid_infiniband(eui, dev);
2246 case ARPHRD_SIT:
2247 return addrconf_ifid_sit(eui, dev);
2248 case ARPHRD_IPGRE:
2249 case ARPHRD_TUNNEL:
2250 return addrconf_ifid_gre(eui, dev);
2251 case ARPHRD_6LOWPAN:
2252 return addrconf_ifid_6lowpan(eui, dev);
2253 case ARPHRD_IEEE1394:
2254 return addrconf_ifid_ieee1394(eui, dev);
2255 case ARPHRD_TUNNEL6:
2256 case ARPHRD_IP6GRE:
2257 return addrconf_ifid_ip6tnl(eui, dev);
2258 }
2259 return -1;
2260 }
2261
2262 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2263 {
2264 int err = -1;
2265 struct inet6_ifaddr *ifp;
2266
2267 read_lock_bh(&idev->lock);
2268 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2269 if (ifp->scope > IFA_LINK)
2270 break;
2271 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2272 memcpy(eui, ifp->addr.s6_addr+8, 8);
2273 err = 0;
2274 break;
2275 }
2276 }
2277 read_unlock_bh(&idev->lock);
2278 return err;
2279 }
2280
2281 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2282 static void ipv6_regen_rndid(struct inet6_dev *idev)
2283 {
2284 regen:
2285 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2286 idev->rndid[0] &= ~0x02;
2287
2288 /*
2289 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2290 * check if generated address is not inappropriate
2291 *
2292 * - Reserved subnet anycast (RFC 2526)
2293 * 11111101 11....11 1xxxxxxx
2294 * - ISATAP (RFC4214) 6.1
2295 * 00-00-5E-FE-xx-xx-xx-xx
2296 * - value 0
2297 * - XXX: already assigned to an address on the device
2298 */
2299 if (idev->rndid[0] == 0xfd &&
2300 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2301 (idev->rndid[7]&0x80))
2302 goto regen;
2303 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2304 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2305 goto regen;
2306 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2307 goto regen;
2308 }
2309 }
2310
2311 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2312 {
2313 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2314 ipv6_regen_rndid(idev);
2315 }
2316
2317 /*
2318 * Add prefix route.
2319 */
2320
2321 static void
2322 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2323 unsigned long expires, u32 flags)
2324 {
2325 struct fib6_config cfg = {
2326 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2327 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2328 .fc_ifindex = dev->ifindex,
2329 .fc_expires = expires,
2330 .fc_dst_len = plen,
2331 .fc_flags = RTF_UP | flags,
2332 .fc_nlinfo.nl_net = dev_net(dev),
2333 .fc_protocol = RTPROT_KERNEL,
2334 };
2335
2336 cfg.fc_dst = *pfx;
2337
2338 /* Prevent useless cloning on PtP SIT.
2339 This thing is done here expecting that the whole
2340 class of non-broadcast devices need not cloning.
2341 */
2342 #if IS_ENABLED(CONFIG_IPV6_SIT)
2343 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2344 cfg.fc_flags |= RTF_NONEXTHOP;
2345 #endif
2346
2347 ip6_route_add(&cfg, NULL);
2348 }
2349
2350
2351 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2352 int plen,
2353 const struct net_device *dev,
2354 u32 flags, u32 noflags)
2355 {
2356 struct fib6_node *fn;
2357 struct rt6_info *rt = NULL;
2358 struct fib6_table *table;
2359 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2360
2361 table = fib6_get_table(dev_net(dev), tb_id);
2362 if (!table)
2363 return NULL;
2364
2365 rcu_read_lock();
2366 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2367 if (!fn)
2368 goto out;
2369
2370 for_each_fib6_node_rt_rcu(fn) {
2371 if (rt->dst.dev->ifindex != dev->ifindex)
2372 continue;
2373 if ((rt->rt6i_flags & flags) != flags)
2374 continue;
2375 if ((rt->rt6i_flags & noflags) != 0)
2376 continue;
2377 if (!dst_hold_safe(&rt->dst))
2378 rt = NULL;
2379 break;
2380 }
2381 out:
2382 rcu_read_unlock();
2383 return rt;
2384 }
2385
2386
2387 /* Create "default" multicast route to the interface */
2388
2389 static void addrconf_add_mroute(struct net_device *dev)
2390 {
2391 struct fib6_config cfg = {
2392 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2393 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2394 .fc_ifindex = dev->ifindex,
2395 .fc_dst_len = 8,
2396 .fc_flags = RTF_UP,
2397 .fc_nlinfo.nl_net = dev_net(dev),
2398 };
2399
2400 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2401
2402 ip6_route_add(&cfg, NULL);
2403 }
2404
2405 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2406 {
2407 struct inet6_dev *idev;
2408
2409 ASSERT_RTNL();
2410
2411 idev = ipv6_find_idev(dev);
2412 if (!idev)
2413 return ERR_PTR(-ENOBUFS);
2414
2415 if (idev->cnf.disable_ipv6)
2416 return ERR_PTR(-EACCES);
2417
2418 /* Add default multicast route */
2419 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2420 addrconf_add_mroute(dev);
2421
2422 return idev;
2423 }
2424
2425 static void manage_tempaddrs(struct inet6_dev *idev,
2426 struct inet6_ifaddr *ifp,
2427 __u32 valid_lft, __u32 prefered_lft,
2428 bool create, unsigned long now)
2429 {
2430 u32 flags;
2431 struct inet6_ifaddr *ift;
2432
2433 read_lock_bh(&idev->lock);
2434 /* update all temporary addresses in the list */
2435 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2436 int age, max_valid, max_prefered;
2437
2438 if (ifp != ift->ifpub)
2439 continue;
2440
2441 /* RFC 4941 section 3.3:
2442 * If a received option will extend the lifetime of a public
2443 * address, the lifetimes of temporary addresses should
2444 * be extended, subject to the overall constraint that no
2445 * temporary addresses should ever remain "valid" or "preferred"
2446 * for a time longer than (TEMP_VALID_LIFETIME) or
2447 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2448 */
2449 age = (now - ift->cstamp) / HZ;
2450 max_valid = idev->cnf.temp_valid_lft - age;
2451 if (max_valid < 0)
2452 max_valid = 0;
2453
2454 max_prefered = idev->cnf.temp_prefered_lft -
2455 idev->desync_factor - age;
2456 if (max_prefered < 0)
2457 max_prefered = 0;
2458
2459 if (valid_lft > max_valid)
2460 valid_lft = max_valid;
2461
2462 if (prefered_lft > max_prefered)
2463 prefered_lft = max_prefered;
2464
2465 spin_lock(&ift->lock);
2466 flags = ift->flags;
2467 ift->valid_lft = valid_lft;
2468 ift->prefered_lft = prefered_lft;
2469 ift->tstamp = now;
2470 if (prefered_lft > 0)
2471 ift->flags &= ~IFA_F_DEPRECATED;
2472
2473 spin_unlock(&ift->lock);
2474 if (!(flags&IFA_F_TENTATIVE))
2475 ipv6_ifa_notify(0, ift);
2476 }
2477
2478 if ((create || list_empty(&idev->tempaddr_list)) &&
2479 idev->cnf.use_tempaddr > 0) {
2480 /* When a new public address is created as described
2481 * in [ADDRCONF], also create a new temporary address.
2482 * Also create a temporary address if it's enabled but
2483 * no temporary address currently exists.
2484 */
2485 read_unlock_bh(&idev->lock);
2486 ipv6_create_tempaddr(ifp, NULL, false);
2487 } else {
2488 read_unlock_bh(&idev->lock);
2489 }
2490 }
2491
2492 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2493 {
2494 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2495 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2496 }
2497
2498 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2499 const struct prefix_info *pinfo,
2500 struct inet6_dev *in6_dev,
2501 const struct in6_addr *addr, int addr_type,
2502 u32 addr_flags, bool sllao, bool tokenized,
2503 __u32 valid_lft, u32 prefered_lft)
2504 {
2505 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2506 int create = 0, update_lft = 0;
2507
2508 if (!ifp && valid_lft) {
2509 int max_addresses = in6_dev->cnf.max_addresses;
2510
2511 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2512 if ((net->ipv6.devconf_all->optimistic_dad ||
2513 in6_dev->cnf.optimistic_dad) &&
2514 !net->ipv6.devconf_all->forwarding && sllao)
2515 addr_flags |= IFA_F_OPTIMISTIC;
2516 #endif
2517
2518 /* Do not allow to create too much of autoconfigured
2519 * addresses; this would be too easy way to crash kernel.
2520 */
2521 if (!max_addresses ||
2522 ipv6_count_addresses(in6_dev) < max_addresses)
2523 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2524 pinfo->prefix_len,
2525 addr_type&IPV6_ADDR_SCOPE_MASK,
2526 addr_flags, valid_lft,
2527 prefered_lft, false, NULL);
2528
2529 if (IS_ERR_OR_NULL(ifp))
2530 return -1;
2531
2532 update_lft = 0;
2533 create = 1;
2534 spin_lock_bh(&ifp->lock);
2535 ifp->flags |= IFA_F_MANAGETEMPADDR;
2536 ifp->cstamp = jiffies;
2537 ifp->tokenized = tokenized;
2538 spin_unlock_bh(&ifp->lock);
2539 addrconf_dad_start(ifp);
2540 }
2541
2542 if (ifp) {
2543 u32 flags;
2544 unsigned long now;
2545 u32 stored_lft;
2546
2547 /* update lifetime (RFC2462 5.5.3 e) */
2548 spin_lock_bh(&ifp->lock);
2549 now = jiffies;
2550 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2551 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2552 else
2553 stored_lft = 0;
2554 if (!update_lft && !create && stored_lft) {
2555 const u32 minimum_lft = min_t(u32,
2556 stored_lft, MIN_VALID_LIFETIME);
2557 valid_lft = max(valid_lft, minimum_lft);
2558
2559 /* RFC4862 Section 5.5.3e:
2560 * "Note that the preferred lifetime of the
2561 * corresponding address is always reset to
2562 * the Preferred Lifetime in the received
2563 * Prefix Information option, regardless of
2564 * whether the valid lifetime is also reset or
2565 * ignored."
2566 *
2567 * So we should always update prefered_lft here.
2568 */
2569 update_lft = 1;
2570 }
2571
2572 if (update_lft) {
2573 ifp->valid_lft = valid_lft;
2574 ifp->prefered_lft = prefered_lft;
2575 ifp->tstamp = now;
2576 flags = ifp->flags;
2577 ifp->flags &= ~IFA_F_DEPRECATED;
2578 spin_unlock_bh(&ifp->lock);
2579
2580 if (!(flags&IFA_F_TENTATIVE))
2581 ipv6_ifa_notify(0, ifp);
2582 } else
2583 spin_unlock_bh(&ifp->lock);
2584
2585 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2586 create, now);
2587
2588 in6_ifa_put(ifp);
2589 addrconf_verify();
2590 }
2591
2592 return 0;
2593 }
2594 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2595
2596 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2597 {
2598 struct prefix_info *pinfo;
2599 __u32 valid_lft;
2600 __u32 prefered_lft;
2601 int addr_type, err;
2602 u32 addr_flags = 0;
2603 struct inet6_dev *in6_dev;
2604 struct net *net = dev_net(dev);
2605
2606 pinfo = (struct prefix_info *) opt;
2607
2608 if (len < sizeof(struct prefix_info)) {
2609 netdev_dbg(dev, "addrconf: prefix option too short\n");
2610 return;
2611 }
2612
2613 /*
2614 * Validation checks ([ADDRCONF], page 19)
2615 */
2616
2617 addr_type = ipv6_addr_type(&pinfo->prefix);
2618
2619 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2620 return;
2621
2622 valid_lft = ntohl(pinfo->valid);
2623 prefered_lft = ntohl(pinfo->prefered);
2624
2625 if (prefered_lft > valid_lft) {
2626 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2627 return;
2628 }
2629
2630 in6_dev = in6_dev_get(dev);
2631
2632 if (!in6_dev) {
2633 net_dbg_ratelimited("addrconf: device %s not configured\n",
2634 dev->name);
2635 return;
2636 }
2637
2638 /*
2639 * Two things going on here:
2640 * 1) Add routes for on-link prefixes
2641 * 2) Configure prefixes with the auto flag set
2642 */
2643
2644 if (pinfo->onlink) {
2645 struct rt6_info *rt;
2646 unsigned long rt_expires;
2647
2648 /* Avoid arithmetic overflow. Really, we could
2649 * save rt_expires in seconds, likely valid_lft,
2650 * but it would require division in fib gc, that it
2651 * not good.
2652 */
2653 if (HZ > USER_HZ)
2654 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2655 else
2656 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2657
2658 if (addrconf_finite_timeout(rt_expires))
2659 rt_expires *= HZ;
2660
2661 rt = addrconf_get_prefix_route(&pinfo->prefix,
2662 pinfo->prefix_len,
2663 dev,
2664 RTF_ADDRCONF | RTF_PREFIX_RT,
2665 RTF_GATEWAY | RTF_DEFAULT);
2666
2667 if (rt) {
2668 /* Autoconf prefix route */
2669 if (valid_lft == 0) {
2670 ip6_del_rt(rt);
2671 rt = NULL;
2672 } else if (addrconf_finite_timeout(rt_expires)) {
2673 /* not infinity */
2674 rt6_set_expires(rt, jiffies + rt_expires);
2675 } else {
2676 rt6_clean_expires(rt);
2677 }
2678 } else if (valid_lft) {
2679 clock_t expires = 0;
2680 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2681 if (addrconf_finite_timeout(rt_expires)) {
2682 /* not infinity */
2683 flags |= RTF_EXPIRES;
2684 expires = jiffies_to_clock_t(rt_expires);
2685 }
2686 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2687 dev, expires, flags);
2688 }
2689 ip6_rt_put(rt);
2690 }
2691
2692 /* Try to figure out our local address for this prefix */
2693
2694 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2695 struct in6_addr addr;
2696 bool tokenized = false, dev_addr_generated = false;
2697
2698 if (pinfo->prefix_len == 64) {
2699 memcpy(&addr, &pinfo->prefix, 8);
2700
2701 if (!ipv6_addr_any(&in6_dev->token)) {
2702 read_lock_bh(&in6_dev->lock);
2703 memcpy(addr.s6_addr + 8,
2704 in6_dev->token.s6_addr + 8, 8);
2705 read_unlock_bh(&in6_dev->lock);
2706 tokenized = true;
2707 } else if (is_addr_mode_generate_stable(in6_dev) &&
2708 !ipv6_generate_stable_address(&addr, 0,
2709 in6_dev)) {
2710 addr_flags |= IFA_F_STABLE_PRIVACY;
2711 goto ok;
2712 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2713 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2714 goto put;
2715 } else {
2716 dev_addr_generated = true;
2717 }
2718 goto ok;
2719 }
2720 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2721 pinfo->prefix_len);
2722 goto put;
2723
2724 ok:
2725 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2726 &addr, addr_type,
2727 addr_flags, sllao,
2728 tokenized, valid_lft,
2729 prefered_lft);
2730 if (err)
2731 goto put;
2732
2733 /* Ignore error case here because previous prefix add addr was
2734 * successful which will be notified.
2735 */
2736 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2737 addr_type, addr_flags, sllao,
2738 tokenized, valid_lft,
2739 prefered_lft,
2740 dev_addr_generated);
2741 }
2742 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2743 put:
2744 in6_dev_put(in6_dev);
2745 }
2746
2747 /*
2748 * Set destination address.
2749 * Special case for SIT interfaces where we create a new "virtual"
2750 * device.
2751 */
2752 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2753 {
2754 struct in6_ifreq ireq;
2755 struct net_device *dev;
2756 int err = -EINVAL;
2757
2758 rtnl_lock();
2759
2760 err = -EFAULT;
2761 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2762 goto err_exit;
2763
2764 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2765
2766 err = -ENODEV;
2767 if (!dev)
2768 goto err_exit;
2769
2770 #if IS_ENABLED(CONFIG_IPV6_SIT)
2771 if (dev->type == ARPHRD_SIT) {
2772 const struct net_device_ops *ops = dev->netdev_ops;
2773 struct ifreq ifr;
2774 struct ip_tunnel_parm p;
2775
2776 err = -EADDRNOTAVAIL;
2777 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2778 goto err_exit;
2779
2780 memset(&p, 0, sizeof(p));
2781 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2782 p.iph.saddr = 0;
2783 p.iph.version = 4;
2784 p.iph.ihl = 5;
2785 p.iph.protocol = IPPROTO_IPV6;
2786 p.iph.ttl = 64;
2787 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2788
2789 if (ops->ndo_do_ioctl) {
2790 mm_segment_t oldfs = get_fs();
2791
2792 set_fs(KERNEL_DS);
2793 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2794 set_fs(oldfs);
2795 } else
2796 err = -EOPNOTSUPP;
2797
2798 if (err == 0) {
2799 err = -ENOBUFS;
2800 dev = __dev_get_by_name(net, p.name);
2801 if (!dev)
2802 goto err_exit;
2803 err = dev_open(dev);
2804 }
2805 }
2806 #endif
2807
2808 err_exit:
2809 rtnl_unlock();
2810 return err;
2811 }
2812
2813 static int ipv6_mc_config(struct sock *sk, bool join,
2814 const struct in6_addr *addr, int ifindex)
2815 {
2816 int ret;
2817
2818 ASSERT_RTNL();
2819
2820 lock_sock(sk);
2821 if (join)
2822 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2823 else
2824 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2825 release_sock(sk);
2826
2827 return ret;
2828 }
2829
2830 /*
2831 * Manual configuration of address on an interface
2832 */
2833 static int inet6_addr_add(struct net *net, int ifindex,
2834 const struct in6_addr *pfx,
2835 const struct in6_addr *peer_pfx,
2836 unsigned int plen, __u32 ifa_flags,
2837 __u32 prefered_lft, __u32 valid_lft,
2838 struct netlink_ext_ack *extack)
2839 {
2840 struct inet6_ifaddr *ifp;
2841 struct inet6_dev *idev;
2842 struct net_device *dev;
2843 unsigned long timeout;
2844 clock_t expires;
2845 int scope;
2846 u32 flags;
2847
2848 ASSERT_RTNL();
2849
2850 if (plen > 128)
2851 return -EINVAL;
2852
2853 /* check the lifetime */
2854 if (!valid_lft || prefered_lft > valid_lft)
2855 return -EINVAL;
2856
2857 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2858 return -EINVAL;
2859
2860 dev = __dev_get_by_index(net, ifindex);
2861 if (!dev)
2862 return -ENODEV;
2863
2864 idev = addrconf_add_dev(dev);
2865 if (IS_ERR(idev))
2866 return PTR_ERR(idev);
2867
2868 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2869 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2870 true, pfx, ifindex);
2871
2872 if (ret < 0)
2873 return ret;
2874 }
2875
2876 scope = ipv6_addr_scope(pfx);
2877
2878 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2879 if (addrconf_finite_timeout(timeout)) {
2880 expires = jiffies_to_clock_t(timeout * HZ);
2881 valid_lft = timeout;
2882 flags = RTF_EXPIRES;
2883 } else {
2884 expires = 0;
2885 flags = 0;
2886 ifa_flags |= IFA_F_PERMANENT;
2887 }
2888
2889 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2890 if (addrconf_finite_timeout(timeout)) {
2891 if (timeout == 0)
2892 ifa_flags |= IFA_F_DEPRECATED;
2893 prefered_lft = timeout;
2894 }
2895
2896 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2897 valid_lft, prefered_lft, true, extack);
2898
2899 if (!IS_ERR(ifp)) {
2900 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2901 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2902 expires, flags);
2903 }
2904
2905 /*
2906 * Note that section 3.1 of RFC 4429 indicates
2907 * that the Optimistic flag should not be set for
2908 * manually configured addresses
2909 */
2910 addrconf_dad_start(ifp);
2911 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2912 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2913 true, jiffies);
2914 in6_ifa_put(ifp);
2915 addrconf_verify_rtnl();
2916 return 0;
2917 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2918 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2919 false, pfx, ifindex);
2920 }
2921
2922 return PTR_ERR(ifp);
2923 }
2924
2925 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2926 const struct in6_addr *pfx, unsigned int plen)
2927 {
2928 struct inet6_ifaddr *ifp;
2929 struct inet6_dev *idev;
2930 struct net_device *dev;
2931
2932 if (plen > 128)
2933 return -EINVAL;
2934
2935 dev = __dev_get_by_index(net, ifindex);
2936 if (!dev)
2937 return -ENODEV;
2938
2939 idev = __in6_dev_get(dev);
2940 if (!idev)
2941 return -ENXIO;
2942
2943 read_lock_bh(&idev->lock);
2944 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2945 if (ifp->prefix_len == plen &&
2946 ipv6_addr_equal(pfx, &ifp->addr)) {
2947 in6_ifa_hold(ifp);
2948 read_unlock_bh(&idev->lock);
2949
2950 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2951 (ifa_flags & IFA_F_MANAGETEMPADDR))
2952 manage_tempaddrs(idev, ifp, 0, 0, false,
2953 jiffies);
2954 ipv6_del_addr(ifp);
2955 addrconf_verify_rtnl();
2956 if (ipv6_addr_is_multicast(pfx)) {
2957 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2958 false, pfx, dev->ifindex);
2959 }
2960 return 0;
2961 }
2962 }
2963 read_unlock_bh(&idev->lock);
2964 return -EADDRNOTAVAIL;
2965 }
2966
2967
2968 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2969 {
2970 struct in6_ifreq ireq;
2971 int err;
2972
2973 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2974 return -EPERM;
2975
2976 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2977 return -EFAULT;
2978
2979 rtnl_lock();
2980 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2981 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2982 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, NULL);
2983 rtnl_unlock();
2984 return err;
2985 }
2986
2987 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2988 {
2989 struct in6_ifreq ireq;
2990 int err;
2991
2992 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2993 return -EPERM;
2994
2995 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2996 return -EFAULT;
2997
2998 rtnl_lock();
2999 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3000 ireq.ifr6_prefixlen);
3001 rtnl_unlock();
3002 return err;
3003 }
3004
3005 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3006 int plen, int scope)
3007 {
3008 struct inet6_ifaddr *ifp;
3009
3010 ifp = ipv6_add_addr(idev, addr, NULL, plen,
3011 scope, IFA_F_PERMANENT,
3012 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME,
3013 true, NULL);
3014 if (!IS_ERR(ifp)) {
3015 spin_lock_bh(&ifp->lock);
3016 ifp->flags &= ~IFA_F_TENTATIVE;
3017 spin_unlock_bh(&ifp->lock);
3018 rt_genid_bump_ipv6(dev_net(idev->dev));
3019 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3020 in6_ifa_put(ifp);
3021 }
3022 }
3023
3024 #if IS_ENABLED(CONFIG_IPV6_SIT)
3025 static void sit_add_v4_addrs(struct inet6_dev *idev)
3026 {
3027 struct in6_addr addr;
3028 struct net_device *dev;
3029 struct net *net = dev_net(idev->dev);
3030 int scope, plen;
3031 u32 pflags = 0;
3032
3033 ASSERT_RTNL();
3034
3035 memset(&addr, 0, sizeof(struct in6_addr));
3036 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3037
3038 if (idev->dev->flags&IFF_POINTOPOINT) {
3039 addr.s6_addr32[0] = htonl(0xfe800000);
3040 scope = IFA_LINK;
3041 plen = 64;
3042 } else {
3043 scope = IPV6_ADDR_COMPATv4;
3044 plen = 96;
3045 pflags |= RTF_NONEXTHOP;
3046 }
3047
3048 if (addr.s6_addr32[3]) {
3049 add_addr(idev, &addr, plen, scope);
3050 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
3051 return;
3052 }
3053
3054 for_each_netdev(net, dev) {
3055 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3056 if (in_dev && (dev->flags & IFF_UP)) {
3057 struct in_ifaddr *ifa;
3058
3059 int flag = scope;
3060
3061 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
3062
3063 addr.s6_addr32[3] = ifa->ifa_local;
3064
3065 if (ifa->ifa_scope == RT_SCOPE_LINK)
3066 continue;
3067 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3068 if (idev->dev->flags&IFF_POINTOPOINT)
3069 continue;
3070 flag |= IFA_HOST;
3071 }
3072
3073 add_addr(idev, &addr, plen, flag);
3074 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3075 pflags);
3076 }
3077 }
3078 }
3079 }
3080 #endif
3081
3082 static void init_loopback(struct net_device *dev)
3083 {
3084 struct inet6_dev *idev;
3085
3086 /* ::1 */
3087
3088 ASSERT_RTNL();
3089
3090 idev = ipv6_find_idev(dev);
3091 if (!idev) {
3092 pr_debug("%s: add_dev failed\n", __func__);
3093 return;
3094 }
3095
3096 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3097 }
3098
3099 void addrconf_add_linklocal(struct inet6_dev *idev,
3100 const struct in6_addr *addr, u32 flags)
3101 {
3102 struct inet6_ifaddr *ifp;
3103 u32 addr_flags = flags | IFA_F_PERMANENT;
3104
3105 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3106 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3107 idev->cnf.optimistic_dad) &&
3108 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3109 addr_flags |= IFA_F_OPTIMISTIC;
3110 #endif
3111
3112 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3113 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME, true, NULL);
3114 if (!IS_ERR(ifp)) {
3115 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3116 addrconf_dad_start(ifp);
3117 in6_ifa_put(ifp);
3118 }
3119 }
3120 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3121
3122 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3123 {
3124 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3125 return true;
3126
3127 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3128 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3129 return true;
3130
3131 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3132 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3133 return true;
3134
3135 return false;
3136 }
3137
3138 static int ipv6_generate_stable_address(struct in6_addr *address,
3139 u8 dad_count,
3140 const struct inet6_dev *idev)
3141 {
3142 static DEFINE_SPINLOCK(lock);
3143 static __u32 digest[SHA_DIGEST_WORDS];
3144 static __u32 workspace[SHA_WORKSPACE_WORDS];
3145
3146 static union {
3147 char __data[SHA_MESSAGE_BYTES];
3148 struct {
3149 struct in6_addr secret;
3150 __be32 prefix[2];
3151 unsigned char hwaddr[MAX_ADDR_LEN];
3152 u8 dad_count;
3153 } __packed;
3154 } data;
3155
3156 struct in6_addr secret;
3157 struct in6_addr temp;
3158 struct net *net = dev_net(idev->dev);
3159
3160 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3161
3162 if (idev->cnf.stable_secret.initialized)
3163 secret = idev->cnf.stable_secret.secret;
3164 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3165 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3166 else
3167 return -1;
3168
3169 retry:
3170 spin_lock_bh(&lock);
3171
3172 sha_init(digest);
3173 memset(&data, 0, sizeof(data));
3174 memset(workspace, 0, sizeof(workspace));
3175 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3176 data.prefix[0] = address->s6_addr32[0];
3177 data.prefix[1] = address->s6_addr32[1];
3178 data.secret = secret;
3179 data.dad_count = dad_count;
3180
3181 sha_transform(digest, data.__data, workspace);
3182
3183 temp = *address;
3184 temp.s6_addr32[2] = (__force __be32)digest[0];
3185 temp.s6_addr32[3] = (__force __be32)digest[1];
3186
3187 spin_unlock_bh(&lock);
3188
3189 if (ipv6_reserved_interfaceid(temp)) {
3190 dad_count++;
3191 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3192 return -1;
3193 goto retry;
3194 }
3195
3196 *address = temp;
3197 return 0;
3198 }
3199
3200 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3201 {
3202 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3203
3204 if (s->initialized)
3205 return;
3206 s = &idev->cnf.stable_secret;
3207 get_random_bytes(&s->secret, sizeof(s->secret));
3208 s->initialized = true;
3209 }
3210
3211 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3212 {
3213 struct in6_addr addr;
3214
3215 /* no link local addresses on L3 master devices */
3216 if (netif_is_l3_master(idev->dev))
3217 return;
3218
3219 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3220
3221 switch (idev->cnf.addr_gen_mode) {
3222 case IN6_ADDR_GEN_MODE_RANDOM:
3223 ipv6_gen_mode_random_init(idev);
3224 /* fallthrough */
3225 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3226 if (!ipv6_generate_stable_address(&addr, 0, idev))
3227 addrconf_add_linklocal(idev, &addr,
3228 IFA_F_STABLE_PRIVACY);
3229 else if (prefix_route)
3230 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3231 break;
3232 case IN6_ADDR_GEN_MODE_EUI64:
3233 /* addrconf_add_linklocal also adds a prefix_route and we
3234 * only need to care about prefix routes if ipv6_generate_eui64
3235 * couldn't generate one.
3236 */
3237 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3238 addrconf_add_linklocal(idev, &addr, 0);
3239 else if (prefix_route)
3240 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3241 break;
3242 case IN6_ADDR_GEN_MODE_NONE:
3243 default:
3244 /* will not add any link local address */
3245 break;
3246 }
3247 }
3248
3249 static void addrconf_dev_config(struct net_device *dev)
3250 {
3251 struct inet6_dev *idev;
3252
3253 ASSERT_RTNL();
3254
3255 if ((dev->type != ARPHRD_ETHER) &&
3256 (dev->type != ARPHRD_FDDI) &&
3257 (dev->type != ARPHRD_ARCNET) &&
3258 (dev->type != ARPHRD_INFINIBAND) &&
3259 (dev->type != ARPHRD_IEEE1394) &&
3260 (dev->type != ARPHRD_TUNNEL6) &&
3261 (dev->type != ARPHRD_6LOWPAN) &&
3262 (dev->type != ARPHRD_IP6GRE) &&
3263 (dev->type != ARPHRD_IPGRE) &&
3264 (dev->type != ARPHRD_TUNNEL) &&
3265 (dev->type != ARPHRD_NONE)) {
3266 /* Alas, we support only Ethernet autoconfiguration. */
3267 return;
3268 }
3269
3270 idev = addrconf_add_dev(dev);
3271 if (IS_ERR(idev))
3272 return;
3273
3274 /* this device type has no EUI support */
3275 if (dev->type == ARPHRD_NONE &&
3276 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3277 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3278
3279 addrconf_addr_gen(idev, false);
3280 }
3281
3282 #if IS_ENABLED(CONFIG_IPV6_SIT)
3283 static void addrconf_sit_config(struct net_device *dev)
3284 {
3285 struct inet6_dev *idev;
3286
3287 ASSERT_RTNL();
3288
3289 /*
3290 * Configure the tunnel with one of our IPv4
3291 * addresses... we should configure all of
3292 * our v4 addrs in the tunnel
3293 */
3294
3295 idev = ipv6_find_idev(dev);
3296 if (!idev) {
3297 pr_debug("%s: add_dev failed\n", __func__);
3298 return;
3299 }
3300
3301 if (dev->priv_flags & IFF_ISATAP) {
3302 addrconf_addr_gen(idev, false);
3303 return;
3304 }
3305
3306 sit_add_v4_addrs(idev);
3307
3308 if (dev->flags&IFF_POINTOPOINT)
3309 addrconf_add_mroute(dev);
3310 }
3311 #endif
3312
3313 #if IS_ENABLED(CONFIG_NET_IPGRE)
3314 static void addrconf_gre_config(struct net_device *dev)
3315 {
3316 struct inet6_dev *idev;
3317
3318 ASSERT_RTNL();
3319
3320 idev = ipv6_find_idev(dev);
3321 if (!idev) {
3322 pr_debug("%s: add_dev failed\n", __func__);
3323 return;
3324 }
3325
3326 addrconf_addr_gen(idev, true);
3327 if (dev->flags & IFF_POINTOPOINT)
3328 addrconf_add_mroute(dev);
3329 }
3330 #endif
3331
3332 static int fixup_permanent_addr(struct inet6_dev *idev,
3333 struct inet6_ifaddr *ifp)
3334 {
3335 /* !rt6i_node means the host route was removed from the
3336 * FIB, for example, if 'lo' device is taken down. In that
3337 * case regenerate the host route.
3338 */
3339 if (!ifp->rt || !ifp->rt->rt6i_node) {
3340 struct rt6_info *rt, *prev;
3341
3342 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3343 if (IS_ERR(rt))
3344 return PTR_ERR(rt);
3345
3346 /* ifp->rt can be accessed outside of rtnl */
3347 spin_lock(&ifp->lock);
3348 prev = ifp->rt;
3349 ifp->rt = rt;
3350 spin_unlock(&ifp->lock);
3351
3352 ip6_rt_put(prev);
3353 }
3354
3355 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3356 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3357 idev->dev, 0, 0);
3358 }
3359
3360 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3361 addrconf_dad_start(ifp);
3362
3363 return 0;
3364 }
3365
3366 static void addrconf_permanent_addr(struct net_device *dev)
3367 {
3368 struct inet6_ifaddr *ifp, *tmp;
3369 struct inet6_dev *idev;
3370
3371 idev = __in6_dev_get(dev);
3372 if (!idev)
3373 return;
3374
3375 write_lock_bh(&idev->lock);
3376
3377 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3378 if ((ifp->flags & IFA_F_PERMANENT) &&
3379 fixup_permanent_addr(idev, ifp) < 0) {
3380 write_unlock_bh(&idev->lock);
3381 in6_ifa_hold(ifp);
3382 ipv6_del_addr(ifp);
3383 write_lock_bh(&idev->lock);
3384
3385 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3386 idev->dev->name, &ifp->addr);
3387 }
3388 }
3389
3390 write_unlock_bh(&idev->lock);
3391 }
3392
3393 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3394 void *ptr)
3395 {
3396 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3397 struct netdev_notifier_changeupper_info *info;
3398 struct inet6_dev *idev = __in6_dev_get(dev);
3399 struct net *net = dev_net(dev);
3400 int run_pending = 0;
3401 int err;
3402
3403 switch (event) {
3404 case NETDEV_REGISTER:
3405 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3406 idev = ipv6_add_dev(dev);
3407 if (IS_ERR(idev))
3408 return notifier_from_errno(PTR_ERR(idev));
3409 }
3410 break;
3411
3412 case NETDEV_CHANGEMTU:
3413 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3414 if (dev->mtu < IPV6_MIN_MTU) {
3415 addrconf_ifdown(dev, dev != net->loopback_dev);
3416 break;
3417 }
3418
3419 if (idev) {
3420 rt6_mtu_change(dev, dev->mtu);
3421 idev->cnf.mtu6 = dev->mtu;
3422 break;
3423 }
3424
3425 /* allocate new idev */
3426 idev = ipv6_add_dev(dev);
3427 if (IS_ERR(idev))
3428 break;
3429
3430 /* device is still not ready */
3431 if (!(idev->if_flags & IF_READY))
3432 break;
3433
3434 run_pending = 1;
3435
3436 /* fall through */
3437
3438 case NETDEV_UP:
3439 case NETDEV_CHANGE:
3440 if (dev->flags & IFF_SLAVE)
3441 break;
3442
3443 if (idev && idev->cnf.disable_ipv6)
3444 break;
3445
3446 if (event == NETDEV_UP) {
3447 /* restore routes for permanent addresses */
3448 addrconf_permanent_addr(dev);
3449
3450 if (!addrconf_link_ready(dev)) {
3451 /* device is not ready yet. */
3452 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3453 dev->name);
3454 break;
3455 }
3456
3457 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3458 idev = ipv6_add_dev(dev);
3459
3460 if (!IS_ERR_OR_NULL(idev)) {
3461 idev->if_flags |= IF_READY;
3462 run_pending = 1;
3463 }
3464 } else if (event == NETDEV_CHANGE) {
3465 if (!addrconf_link_ready(dev)) {
3466 /* device is still not ready. */
3467 rt6_sync_down_dev(dev, event);
3468 break;
3469 }
3470
3471 if (idev) {
3472 if (idev->if_flags & IF_READY) {
3473 /* device is already configured -
3474 * but resend MLD reports, we might
3475 * have roamed and need to update
3476 * multicast snooping switches
3477 */
3478 ipv6_mc_up(idev);
3479 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3480 break;
3481 }
3482 idev->if_flags |= IF_READY;
3483 }
3484
3485 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3486 dev->name);
3487
3488 run_pending = 1;
3489 }
3490
3491 switch (dev->type) {
3492 #if IS_ENABLED(CONFIG_IPV6_SIT)
3493 case ARPHRD_SIT:
3494 addrconf_sit_config(dev);
3495 break;
3496 #endif
3497 #if IS_ENABLED(CONFIG_NET_IPGRE)
3498 case ARPHRD_IPGRE:
3499 addrconf_gre_config(dev);
3500 break;
3501 #endif
3502 case ARPHRD_LOOPBACK:
3503 init_loopback(dev);
3504 break;
3505
3506 default:
3507 addrconf_dev_config(dev);
3508 break;
3509 }
3510
3511 if (!IS_ERR_OR_NULL(idev)) {
3512 if (run_pending)
3513 addrconf_dad_run(idev);
3514
3515 /* Device has an address by now */
3516 rt6_sync_up(dev, RTNH_F_DEAD);
3517
3518 /*
3519 * If the MTU changed during the interface down,
3520 * when the interface up, the changed MTU must be
3521 * reflected in the idev as well as routers.
3522 */
3523 if (idev->cnf.mtu6 != dev->mtu &&
3524 dev->mtu >= IPV6_MIN_MTU) {
3525 rt6_mtu_change(dev, dev->mtu);
3526 idev->cnf.mtu6 = dev->mtu;
3527 }
3528 idev->tstamp = jiffies;
3529 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3530
3531 /*
3532 * If the changed mtu during down is lower than
3533 * IPV6_MIN_MTU stop IPv6 on this interface.
3534 */
3535 if (dev->mtu < IPV6_MIN_MTU)
3536 addrconf_ifdown(dev, dev != net->loopback_dev);
3537 }
3538 break;
3539
3540 case NETDEV_DOWN:
3541 case NETDEV_UNREGISTER:
3542 /*
3543 * Remove all addresses from this interface.
3544 */
3545 addrconf_ifdown(dev, event != NETDEV_DOWN);
3546 break;
3547
3548 case NETDEV_CHANGENAME:
3549 if (idev) {
3550 snmp6_unregister_dev(idev);
3551 addrconf_sysctl_unregister(idev);
3552 err = addrconf_sysctl_register(idev);
3553 if (err)
3554 return notifier_from_errno(err);
3555 err = snmp6_register_dev(idev);
3556 if (err) {
3557 addrconf_sysctl_unregister(idev);
3558 return notifier_from_errno(err);
3559 }
3560 }
3561 break;
3562
3563 case NETDEV_PRE_TYPE_CHANGE:
3564 case NETDEV_POST_TYPE_CHANGE:
3565 if (idev)
3566 addrconf_type_change(dev, event);
3567 break;
3568
3569 case NETDEV_CHANGEUPPER:
3570 info = ptr;
3571
3572 /* flush all routes if dev is linked to or unlinked from
3573 * an L3 master device (e.g., VRF)
3574 */
3575 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3576 addrconf_ifdown(dev, 0);
3577 }
3578
3579 return NOTIFY_OK;
3580 }
3581
3582 /*
3583 * addrconf module should be notified of a device going up
3584 */
3585 static struct notifier_block ipv6_dev_notf = {
3586 .notifier_call = addrconf_notify,
3587 .priority = ADDRCONF_NOTIFY_PRIORITY,
3588 };
3589
3590 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3591 {
3592 struct inet6_dev *idev;
3593 ASSERT_RTNL();
3594
3595 idev = __in6_dev_get(dev);
3596
3597 if (event == NETDEV_POST_TYPE_CHANGE)
3598 ipv6_mc_remap(idev);
3599 else if (event == NETDEV_PRE_TYPE_CHANGE)
3600 ipv6_mc_unmap(idev);
3601 }
3602
3603 static bool addr_is_local(const struct in6_addr *addr)
3604 {
3605 return ipv6_addr_type(addr) &
3606 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3607 }
3608
3609 static int addrconf_ifdown(struct net_device *dev, int how)
3610 {
3611 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3612 struct net *net = dev_net(dev);
3613 struct inet6_dev *idev;
3614 struct inet6_ifaddr *ifa, *tmp;
3615 int _keep_addr;
3616 bool keep_addr;
3617 int state, i;
3618
3619 ASSERT_RTNL();
3620
3621 rt6_disable_ip(dev, event);
3622
3623 idev = __in6_dev_get(dev);
3624 if (!idev)
3625 return -ENODEV;
3626
3627 /*
3628 * Step 1: remove reference to ipv6 device from parent device.
3629 * Do not dev_put!
3630 */
3631 if (how) {
3632 idev->dead = 1;
3633
3634 /* protected by rtnl_lock */
3635 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3636
3637 /* Step 1.5: remove snmp6 entry */
3638 snmp6_unregister_dev(idev);
3639
3640 }
3641
3642 /* aggregate the system setting and interface setting */
3643 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3644 if (!_keep_addr)
3645 _keep_addr = idev->cnf.keep_addr_on_down;
3646
3647 /* combine the user config with event to determine if permanent
3648 * addresses are to be removed from address hash table
3649 */
3650 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3651
3652 /* Step 2: clear hash table */
3653 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3654 struct hlist_head *h = &inet6_addr_lst[i];
3655
3656 spin_lock_bh(&addrconf_hash_lock);
3657 restart:
3658 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3659 if (ifa->idev == idev) {
3660 addrconf_del_dad_work(ifa);
3661 /* combined flag + permanent flag decide if
3662 * address is retained on a down event
3663 */
3664 if (!keep_addr ||
3665 !(ifa->flags & IFA_F_PERMANENT) ||
3666 addr_is_local(&ifa->addr)) {
3667 hlist_del_init_rcu(&ifa->addr_lst);
3668 goto restart;
3669 }
3670 }
3671 }
3672 spin_unlock_bh(&addrconf_hash_lock);
3673 }
3674
3675 write_lock_bh(&idev->lock);
3676
3677 addrconf_del_rs_timer(idev);
3678
3679 /* Step 2: clear flags for stateless addrconf */
3680 if (!how)
3681 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3682
3683 /* Step 3: clear tempaddr list */
3684 while (!list_empty(&idev->tempaddr_list)) {
3685 ifa = list_first_entry(&idev->tempaddr_list,
3686 struct inet6_ifaddr, tmp_list);
3687 list_del(&ifa->tmp_list);
3688 write_unlock_bh(&idev->lock);
3689 spin_lock_bh(&ifa->lock);
3690
3691 if (ifa->ifpub) {
3692 in6_ifa_put(ifa->ifpub);
3693 ifa->ifpub = NULL;
3694 }
3695 spin_unlock_bh(&ifa->lock);
3696 in6_ifa_put(ifa);
3697 write_lock_bh(&idev->lock);
3698 }
3699
3700 /* re-combine the user config with event to determine if permanent
3701 * addresses are to be removed from the interface list
3702 */
3703 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3704
3705 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3706 struct rt6_info *rt = NULL;
3707 bool keep;
3708
3709 addrconf_del_dad_work(ifa);
3710
3711 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3712 !addr_is_local(&ifa->addr);
3713
3714 write_unlock_bh(&idev->lock);
3715 spin_lock_bh(&ifa->lock);
3716
3717 if (keep) {
3718 /* set state to skip the notifier below */
3719 state = INET6_IFADDR_STATE_DEAD;
3720 ifa->state = INET6_IFADDR_STATE_PREDAD;
3721 if (!(ifa->flags & IFA_F_NODAD))
3722 ifa->flags |= IFA_F_TENTATIVE;
3723
3724 rt = ifa->rt;
3725 ifa->rt = NULL;
3726 } else {
3727 state = ifa->state;
3728 ifa->state = INET6_IFADDR_STATE_DEAD;
3729 }
3730
3731 spin_unlock_bh(&ifa->lock);
3732
3733 if (rt)
3734 ip6_del_rt(rt);
3735
3736 if (state != INET6_IFADDR_STATE_DEAD) {
3737 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3738 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3739 } else {
3740 if (idev->cnf.forwarding)
3741 addrconf_leave_anycast(ifa);
3742 addrconf_leave_solict(ifa->idev, &ifa->addr);
3743 }
3744
3745 write_lock_bh(&idev->lock);
3746 if (!keep) {
3747 list_del_rcu(&ifa->if_list);
3748 in6_ifa_put(ifa);
3749 }
3750 }
3751
3752 write_unlock_bh(&idev->lock);
3753
3754 /* Step 5: Discard anycast and multicast list */
3755 if (how) {
3756 ipv6_ac_destroy_dev(idev);
3757 ipv6_mc_destroy_dev(idev);
3758 } else {
3759 ipv6_mc_down(idev);
3760 }
3761
3762 idev->tstamp = jiffies;
3763
3764 /* Last: Shot the device (if unregistered) */
3765 if (how) {
3766 addrconf_sysctl_unregister(idev);
3767 neigh_parms_release(&nd_tbl, idev->nd_parms);
3768 neigh_ifdown(&nd_tbl, dev);
3769 in6_dev_put(idev);
3770 }
3771 return 0;
3772 }
3773
3774 static void addrconf_rs_timer(struct timer_list *t)
3775 {
3776 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3777 struct net_device *dev = idev->dev;
3778 struct in6_addr lladdr;
3779
3780 write_lock(&idev->lock);
3781 if (idev->dead || !(idev->if_flags & IF_READY))
3782 goto out;
3783
3784 if (!ipv6_accept_ra(idev))
3785 goto out;
3786
3787 /* Announcement received after solicitation was sent */
3788 if (idev->if_flags & IF_RA_RCVD)
3789 goto out;
3790
3791 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3792 write_unlock(&idev->lock);
3793 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3794 ndisc_send_rs(dev, &lladdr,
3795 &in6addr_linklocal_allrouters);
3796 else
3797 goto put;
3798
3799 write_lock(&idev->lock);
3800 idev->rs_interval = rfc3315_s14_backoff_update(
3801 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3802 /* The wait after the last probe can be shorter */
3803 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3804 idev->cnf.rtr_solicits) ?
3805 idev->cnf.rtr_solicit_delay :
3806 idev->rs_interval);
3807 } else {
3808 /*
3809 * Note: we do not support deprecated "all on-link"
3810 * assumption any longer.
3811 */
3812 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3813 }
3814
3815 out:
3816 write_unlock(&idev->lock);
3817 put:
3818 in6_dev_put(idev);
3819 }
3820
3821 /*
3822 * Duplicate Address Detection
3823 */
3824 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3825 {
3826 unsigned long rand_num;
3827 struct inet6_dev *idev = ifp->idev;
3828 u64 nonce;
3829
3830 if (ifp->flags & IFA_F_OPTIMISTIC)
3831 rand_num = 0;
3832 else
3833 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3834
3835 nonce = 0;
3836 if (idev->cnf.enhanced_dad ||
3837 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3838 do
3839 get_random_bytes(&nonce, 6);
3840 while (nonce == 0);
3841 }
3842 ifp->dad_nonce = nonce;
3843 ifp->dad_probes = idev->cnf.dad_transmits;
3844 addrconf_mod_dad_work(ifp, rand_num);
3845 }
3846
3847 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3848 {
3849 struct inet6_dev *idev = ifp->idev;
3850 struct net_device *dev = idev->dev;
3851 bool bump_id, notify = false;
3852
3853 addrconf_join_solict(dev, &ifp->addr);
3854
3855 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3856
3857 read_lock_bh(&idev->lock);
3858 spin_lock(&ifp->lock);
3859 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3860 goto out;
3861
3862 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3863 (dev_net(dev)->ipv6.devconf_all->accept_dad < 1 &&
3864 idev->cnf.accept_dad < 1) ||
3865 !(ifp->flags&IFA_F_TENTATIVE) ||
3866 ifp->flags & IFA_F_NODAD) {
3867 bool send_na = false;
3868
3869 if (ifp->flags & IFA_F_TENTATIVE &&
3870 !(ifp->flags & IFA_F_OPTIMISTIC))
3871 send_na = true;
3872 bump_id = ifp->flags & IFA_F_TENTATIVE;
3873 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3874 spin_unlock(&ifp->lock);
3875 read_unlock_bh(&idev->lock);
3876
3877 addrconf_dad_completed(ifp, bump_id, send_na);
3878 return;
3879 }
3880
3881 if (!(idev->if_flags & IF_READY)) {
3882 spin_unlock(&ifp->lock);
3883 read_unlock_bh(&idev->lock);
3884 /*
3885 * If the device is not ready:
3886 * - keep it tentative if it is a permanent address.
3887 * - otherwise, kill it.
3888 */
3889 in6_ifa_hold(ifp);
3890 addrconf_dad_stop(ifp, 0);
3891 return;
3892 }
3893
3894 /*
3895 * Optimistic nodes can start receiving
3896 * Frames right away
3897 */
3898 if (ifp->flags & IFA_F_OPTIMISTIC) {
3899 ip6_ins_rt(ifp->rt);
3900 if (ipv6_use_optimistic_addr(dev_net(dev), idev)) {
3901 /* Because optimistic nodes can use this address,
3902 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3903 */
3904 notify = true;
3905 }
3906 }
3907
3908 addrconf_dad_kick(ifp);
3909 out:
3910 spin_unlock(&ifp->lock);
3911 read_unlock_bh(&idev->lock);
3912 if (notify)
3913 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3914 }
3915
3916 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3917 {
3918 bool begin_dad = false;
3919
3920 spin_lock_bh(&ifp->lock);
3921 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3922 ifp->state = INET6_IFADDR_STATE_PREDAD;
3923 begin_dad = true;
3924 }
3925 spin_unlock_bh(&ifp->lock);
3926
3927 if (begin_dad)
3928 addrconf_mod_dad_work(ifp, 0);
3929 }
3930
3931 static void addrconf_dad_work(struct work_struct *w)
3932 {
3933 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3934 struct inet6_ifaddr,
3935 dad_work);
3936 struct inet6_dev *idev = ifp->idev;
3937 bool bump_id, disable_ipv6 = false;
3938 struct in6_addr mcaddr;
3939
3940 enum {
3941 DAD_PROCESS,
3942 DAD_BEGIN,
3943 DAD_ABORT,
3944 } action = DAD_PROCESS;
3945
3946 rtnl_lock();
3947
3948 spin_lock_bh(&ifp->lock);
3949 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3950 action = DAD_BEGIN;
3951 ifp->state = INET6_IFADDR_STATE_DAD;
3952 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3953 action = DAD_ABORT;
3954 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3955
3956 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3957 idev->cnf.accept_dad > 1) &&
3958 !idev->cnf.disable_ipv6 &&
3959 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3960 struct in6_addr addr;
3961
3962 addr.s6_addr32[0] = htonl(0xfe800000);
3963 addr.s6_addr32[1] = 0;
3964
3965 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3966 ipv6_addr_equal(&ifp->addr, &addr)) {
3967 /* DAD failed for link-local based on MAC */
3968 idev->cnf.disable_ipv6 = 1;
3969
3970 pr_info("%s: IPv6 being disabled!\n",
3971 ifp->idev->dev->name);
3972 disable_ipv6 = true;
3973 }
3974 }
3975 }
3976 spin_unlock_bh(&ifp->lock);
3977
3978 if (action == DAD_BEGIN) {
3979 addrconf_dad_begin(ifp);
3980 goto out;
3981 } else if (action == DAD_ABORT) {
3982 in6_ifa_hold(ifp);
3983 addrconf_dad_stop(ifp, 1);
3984 if (disable_ipv6)
3985 addrconf_ifdown(idev->dev, 0);
3986 goto out;
3987 }
3988
3989 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3990 goto out;
3991
3992 write_lock_bh(&idev->lock);
3993 if (idev->dead || !(idev->if_flags & IF_READY)) {
3994 write_unlock_bh(&idev->lock);
3995 goto out;
3996 }
3997
3998 spin_lock(&ifp->lock);
3999 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4000 spin_unlock(&ifp->lock);
4001 write_unlock_bh(&idev->lock);
4002 goto out;
4003 }
4004
4005 if (ifp->dad_probes == 0) {
4006 bool send_na = false;
4007
4008 /*
4009 * DAD was successful
4010 */
4011
4012 if (ifp->flags & IFA_F_TENTATIVE &&
4013 !(ifp->flags & IFA_F_OPTIMISTIC))
4014 send_na = true;
4015 bump_id = ifp->flags & IFA_F_TENTATIVE;
4016 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4017 spin_unlock(&ifp->lock);
4018 write_unlock_bh(&idev->lock);
4019
4020 addrconf_dad_completed(ifp, bump_id, send_na);
4021
4022 goto out;
4023 }
4024
4025 ifp->dad_probes--;
4026 addrconf_mod_dad_work(ifp,
4027 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4028 spin_unlock(&ifp->lock);
4029 write_unlock_bh(&idev->lock);
4030
4031 /* send a neighbour solicitation for our addr */
4032 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4033 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4034 ifp->dad_nonce);
4035 out:
4036 in6_ifa_put(ifp);
4037 rtnl_unlock();
4038 }
4039
4040 /* ifp->idev must be at least read locked */
4041 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4042 {
4043 struct inet6_ifaddr *ifpiter;
4044 struct inet6_dev *idev = ifp->idev;
4045
4046 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4047 if (ifpiter->scope > IFA_LINK)
4048 break;
4049 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4050 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4051 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4052 IFA_F_PERMANENT)
4053 return false;
4054 }
4055 return true;
4056 }
4057
4058 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4059 bool send_na)
4060 {
4061 struct net_device *dev = ifp->idev->dev;
4062 struct in6_addr lladdr;
4063 bool send_rs, send_mld;
4064
4065 addrconf_del_dad_work(ifp);
4066
4067 /*
4068 * Configure the address for reception. Now it is valid.
4069 */
4070
4071 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4072
4073 /* If added prefix is link local and we are prepared to process
4074 router advertisements, start sending router solicitations.
4075 */
4076
4077 read_lock_bh(&ifp->idev->lock);
4078 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4079 send_rs = send_mld &&
4080 ipv6_accept_ra(ifp->idev) &&
4081 ifp->idev->cnf.rtr_solicits != 0 &&
4082 (dev->flags&IFF_LOOPBACK) == 0;
4083 read_unlock_bh(&ifp->idev->lock);
4084
4085 /* While dad is in progress mld report's source address is in6_addrany.
4086 * Resend with proper ll now.
4087 */
4088 if (send_mld)
4089 ipv6_mc_dad_complete(ifp->idev);
4090
4091 /* send unsolicited NA if enabled */
4092 if (send_na &&
4093 (ifp->idev->cnf.ndisc_notify ||
4094 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4095 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4096 /*router=*/ !!ifp->idev->cnf.forwarding,
4097 /*solicited=*/ false, /*override=*/ true,
4098 /*inc_opt=*/ true);
4099 }
4100
4101 if (send_rs) {
4102 /*
4103 * If a host as already performed a random delay
4104 * [...] as part of DAD [...] there is no need
4105 * to delay again before sending the first RS
4106 */
4107 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4108 return;
4109 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4110
4111 write_lock_bh(&ifp->idev->lock);
4112 spin_lock(&ifp->lock);
4113 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4114 ifp->idev->cnf.rtr_solicit_interval);
4115 ifp->idev->rs_probes = 1;
4116 ifp->idev->if_flags |= IF_RS_SENT;
4117 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4118 spin_unlock(&ifp->lock);
4119 write_unlock_bh(&ifp->idev->lock);
4120 }
4121
4122 if (bump_id)
4123 rt_genid_bump_ipv6(dev_net(dev));
4124
4125 /* Make sure that a new temporary address will be created
4126 * before this temporary address becomes deprecated.
4127 */
4128 if (ifp->flags & IFA_F_TEMPORARY)
4129 addrconf_verify_rtnl();
4130 }
4131
4132 static void addrconf_dad_run(struct inet6_dev *idev)
4133 {
4134 struct inet6_ifaddr *ifp;
4135
4136 read_lock_bh(&idev->lock);
4137 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4138 spin_lock(&ifp->lock);
4139 if (ifp->flags & IFA_F_TENTATIVE &&
4140 ifp->state == INET6_IFADDR_STATE_DAD)
4141 addrconf_dad_kick(ifp);
4142 spin_unlock(&ifp->lock);
4143 }
4144 read_unlock_bh(&idev->lock);
4145 }
4146
4147 #ifdef CONFIG_PROC_FS
4148 struct if6_iter_state {
4149 struct seq_net_private p;
4150 int bucket;
4151 int offset;
4152 };
4153
4154 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4155 {
4156 struct if6_iter_state *state = seq->private;
4157 struct net *net = seq_file_net(seq);
4158 struct inet6_ifaddr *ifa = NULL;
4159 int p = 0;
4160
4161 /* initial bucket if pos is 0 */
4162 if (pos == 0) {
4163 state->bucket = 0;
4164 state->offset = 0;
4165 }
4166
4167 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4168 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4169 addr_lst) {
4170 if (!net_eq(dev_net(ifa->idev->dev), net))
4171 continue;
4172 /* sync with offset */
4173 if (p < state->offset) {
4174 p++;
4175 continue;
4176 }
4177 state->offset++;
4178 return ifa;
4179 }
4180
4181 /* prepare for next bucket */
4182 state->offset = 0;
4183 p = 0;
4184 }
4185 return NULL;
4186 }
4187
4188 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4189 struct inet6_ifaddr *ifa)
4190 {
4191 struct if6_iter_state *state = seq->private;
4192 struct net *net = seq_file_net(seq);
4193
4194 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4195 if (!net_eq(dev_net(ifa->idev->dev), net))
4196 continue;
4197 state->offset++;
4198 return ifa;
4199 }
4200
4201 while (++state->bucket < IN6_ADDR_HSIZE) {
4202 state->offset = 0;
4203 hlist_for_each_entry_rcu(ifa,
4204 &inet6_addr_lst[state->bucket], addr_lst) {
4205 if (!net_eq(dev_net(ifa->idev->dev), net))
4206 continue;
4207 state->offset++;
4208 return ifa;
4209 }
4210 }
4211
4212 return NULL;
4213 }
4214
4215 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4216 __acquires(rcu)
4217 {
4218 rcu_read_lock();
4219 return if6_get_first(seq, *pos);
4220 }
4221
4222 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4223 {
4224 struct inet6_ifaddr *ifa;
4225
4226 ifa = if6_get_next(seq, v);
4227 ++*pos;
4228 return ifa;
4229 }
4230
4231 static void if6_seq_stop(struct seq_file *seq, void *v)
4232 __releases(rcu)
4233 {
4234 rcu_read_unlock();
4235 }
4236
4237 static int if6_seq_show(struct seq_file *seq, void *v)
4238 {
4239 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4240 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4241 &ifp->addr,
4242 ifp->idev->dev->ifindex,
4243 ifp->prefix_len,
4244 ifp->scope,
4245 (u8) ifp->flags,
4246 ifp->idev->dev->name);
4247 return 0;
4248 }
4249
4250 static const struct seq_operations if6_seq_ops = {
4251 .start = if6_seq_start,
4252 .next = if6_seq_next,
4253 .show = if6_seq_show,
4254 .stop = if6_seq_stop,
4255 };
4256
4257 static int if6_seq_open(struct inode *inode, struct file *file)
4258 {
4259 return seq_open_net(inode, file, &if6_seq_ops,
4260 sizeof(struct if6_iter_state));
4261 }
4262
4263 static const struct file_operations if6_fops = {
4264 .open = if6_seq_open,
4265 .read = seq_read,
4266 .llseek = seq_lseek,
4267 .release = seq_release_net,
4268 };
4269
4270 static int __net_init if6_proc_net_init(struct net *net)
4271 {
4272 if (!proc_create("if_inet6", 0444, net->proc_net, &if6_fops))
4273 return -ENOMEM;
4274 return 0;
4275 }
4276
4277 static void __net_exit if6_proc_net_exit(struct net *net)
4278 {
4279 remove_proc_entry("if_inet6", net->proc_net);
4280 }
4281
4282 static struct pernet_operations if6_proc_net_ops = {
4283 .init = if6_proc_net_init,
4284 .exit = if6_proc_net_exit,
4285 };
4286
4287 int __init if6_proc_init(void)
4288 {
4289 return register_pernet_subsys(&if6_proc_net_ops);
4290 }
4291
4292 void if6_proc_exit(void)
4293 {
4294 unregister_pernet_subsys(&if6_proc_net_ops);
4295 }
4296 #endif /* CONFIG_PROC_FS */
4297
4298 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4299 /* Check if address is a home address configured on any interface. */
4300 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4301 {
4302 unsigned int hash = inet6_addr_hash(net, addr);
4303 struct inet6_ifaddr *ifp = NULL;
4304 int ret = 0;
4305
4306 rcu_read_lock();
4307 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4308 if (!net_eq(dev_net(ifp->idev->dev), net))
4309 continue;
4310 if (ipv6_addr_equal(&ifp->addr, addr) &&
4311 (ifp->flags & IFA_F_HOMEADDRESS)) {
4312 ret = 1;
4313 break;
4314 }
4315 }
4316 rcu_read_unlock();
4317 return ret;
4318 }
4319 #endif
4320
4321 /*
4322 * Periodic address status verification
4323 */
4324
4325 static void addrconf_verify_rtnl(void)
4326 {
4327 unsigned long now, next, next_sec, next_sched;
4328 struct inet6_ifaddr *ifp;
4329 int i;
4330
4331 ASSERT_RTNL();
4332
4333 rcu_read_lock_bh();
4334 now = jiffies;
4335 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4336
4337 cancel_delayed_work(&addr_chk_work);
4338
4339 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4340 restart:
4341 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4342 unsigned long age;
4343
4344 /* When setting preferred_lft to a value not zero or
4345 * infinity, while valid_lft is infinity
4346 * IFA_F_PERMANENT has a non-infinity life time.
4347 */
4348 if ((ifp->flags & IFA_F_PERMANENT) &&
4349 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4350 continue;
4351
4352 spin_lock(&ifp->lock);
4353 /* We try to batch several events at once. */
4354 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4355
4356 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4357 age >= ifp->valid_lft) {
4358 spin_unlock(&ifp->lock);
4359 in6_ifa_hold(ifp);
4360 ipv6_del_addr(ifp);
4361 goto restart;
4362 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4363 spin_unlock(&ifp->lock);
4364 continue;
4365 } else if (age >= ifp->prefered_lft) {
4366 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4367 int deprecate = 0;
4368
4369 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4370 deprecate = 1;
4371 ifp->flags |= IFA_F_DEPRECATED;
4372 }
4373
4374 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4375 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4376 next = ifp->tstamp + ifp->valid_lft * HZ;
4377
4378 spin_unlock(&ifp->lock);
4379
4380 if (deprecate) {
4381 in6_ifa_hold(ifp);
4382
4383 ipv6_ifa_notify(0, ifp);
4384 in6_ifa_put(ifp);
4385 goto restart;
4386 }
4387 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4388 !(ifp->flags&IFA_F_TENTATIVE)) {
4389 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4390 ifp->idev->cnf.dad_transmits *
4391 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4392
4393 if (age >= ifp->prefered_lft - regen_advance) {
4394 struct inet6_ifaddr *ifpub = ifp->ifpub;
4395 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4396 next = ifp->tstamp + ifp->prefered_lft * HZ;
4397 if (!ifp->regen_count && ifpub) {
4398 ifp->regen_count++;
4399 in6_ifa_hold(ifp);
4400 in6_ifa_hold(ifpub);
4401 spin_unlock(&ifp->lock);
4402
4403 spin_lock(&ifpub->lock);
4404 ifpub->regen_count = 0;
4405 spin_unlock(&ifpub->lock);
4406 rcu_read_unlock_bh();
4407 ipv6_create_tempaddr(ifpub, ifp, true);
4408 in6_ifa_put(ifpub);
4409 in6_ifa_put(ifp);
4410 rcu_read_lock_bh();
4411 goto restart;
4412 }
4413 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4414 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4415 spin_unlock(&ifp->lock);
4416 } else {
4417 /* ifp->prefered_lft <= ifp->valid_lft */
4418 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4419 next = ifp->tstamp + ifp->prefered_lft * HZ;
4420 spin_unlock(&ifp->lock);
4421 }
4422 }
4423 }
4424
4425 next_sec = round_jiffies_up(next);
4426 next_sched = next;
4427
4428 /* If rounded timeout is accurate enough, accept it. */
4429 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4430 next_sched = next_sec;
4431
4432 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4433 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4434 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4435
4436 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4437 now, next, next_sec, next_sched);
4438 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4439 rcu_read_unlock_bh();
4440 }
4441
4442 static void addrconf_verify_work(struct work_struct *w)
4443 {
4444 rtnl_lock();
4445 addrconf_verify_rtnl();
4446 rtnl_unlock();
4447 }
4448
4449 static void addrconf_verify(void)
4450 {
4451 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4452 }
4453
4454 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4455 struct in6_addr **peer_pfx)
4456 {
4457 struct in6_addr *pfx = NULL;
4458
4459 *peer_pfx = NULL;
4460
4461 if (addr)
4462 pfx = nla_data(addr);
4463
4464 if (local) {
4465 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4466 *peer_pfx = pfx;
4467 pfx = nla_data(local);
4468 }
4469
4470 return pfx;
4471 }
4472
4473 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4474 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4475 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4476 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4477 [IFA_FLAGS] = { .len = sizeof(u32) },
4478 };
4479
4480 static int
4481 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4482 struct netlink_ext_ack *extack)
4483 {
4484 struct net *net = sock_net(skb->sk);
4485 struct ifaddrmsg *ifm;
4486 struct nlattr *tb[IFA_MAX+1];
4487 struct in6_addr *pfx, *peer_pfx;
4488 u32 ifa_flags;
4489 int err;
4490
4491 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4492 extack);
4493 if (err < 0)
4494 return err;
4495
4496 ifm = nlmsg_data(nlh);
4497 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4498 if (!pfx)
4499 return -EINVAL;
4500
4501 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4502
4503 /* We ignore other flags so far. */
4504 ifa_flags &= IFA_F_MANAGETEMPADDR;
4505
4506 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4507 ifm->ifa_prefixlen);
4508 }
4509
4510 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4511 u32 prefered_lft, u32 valid_lft)
4512 {
4513 u32 flags;
4514 clock_t expires;
4515 unsigned long timeout;
4516 bool was_managetempaddr;
4517 bool had_prefixroute;
4518
4519 ASSERT_RTNL();
4520
4521 if (!valid_lft || (prefered_lft > valid_lft))
4522 return -EINVAL;
4523
4524 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4525 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4526 return -EINVAL;
4527
4528 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4529 ifa_flags &= ~IFA_F_OPTIMISTIC;
4530
4531 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4532 if (addrconf_finite_timeout(timeout)) {
4533 expires = jiffies_to_clock_t(timeout * HZ);
4534 valid_lft = timeout;
4535 flags = RTF_EXPIRES;
4536 } else {
4537 expires = 0;
4538 flags = 0;
4539 ifa_flags |= IFA_F_PERMANENT;
4540 }
4541
4542 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4543 if (addrconf_finite_timeout(timeout)) {
4544 if (timeout == 0)
4545 ifa_flags |= IFA_F_DEPRECATED;
4546 prefered_lft = timeout;
4547 }
4548
4549 spin_lock_bh(&ifp->lock);
4550 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4551 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4552 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4553 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4554 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4555 IFA_F_NOPREFIXROUTE);
4556 ifp->flags |= ifa_flags;
4557 ifp->tstamp = jiffies;
4558 ifp->valid_lft = valid_lft;
4559 ifp->prefered_lft = prefered_lft;
4560
4561 spin_unlock_bh(&ifp->lock);
4562 if (!(ifp->flags&IFA_F_TENTATIVE))
4563 ipv6_ifa_notify(0, ifp);
4564
4565 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4566 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4567 expires, flags);
4568 } else if (had_prefixroute) {
4569 enum cleanup_prefix_rt_t action;
4570 unsigned long rt_expires;
4571
4572 write_lock_bh(&ifp->idev->lock);
4573 action = check_cleanup_prefix_route(ifp, &rt_expires);
4574 write_unlock_bh(&ifp->idev->lock);
4575
4576 if (action != CLEANUP_PREFIX_RT_NOP) {
4577 cleanup_prefix_route(ifp, rt_expires,
4578 action == CLEANUP_PREFIX_RT_DEL);
4579 }
4580 }
4581
4582 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4583 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4584 valid_lft = prefered_lft = 0;
4585 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4586 !was_managetempaddr, jiffies);
4587 }
4588
4589 addrconf_verify_rtnl();
4590
4591 return 0;
4592 }
4593
4594 static int
4595 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4596 struct netlink_ext_ack *extack)
4597 {
4598 struct net *net = sock_net(skb->sk);
4599 struct ifaddrmsg *ifm;
4600 struct nlattr *tb[IFA_MAX+1];
4601 struct in6_addr *pfx, *peer_pfx;
4602 struct inet6_ifaddr *ifa;
4603 struct net_device *dev;
4604 struct inet6_dev *idev;
4605 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4606 u32 ifa_flags;
4607 int err;
4608
4609 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4610 extack);
4611 if (err < 0)
4612 return err;
4613
4614 ifm = nlmsg_data(nlh);
4615 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4616 if (!pfx)
4617 return -EINVAL;
4618
4619 if (tb[IFA_CACHEINFO]) {
4620 struct ifa_cacheinfo *ci;
4621
4622 ci = nla_data(tb[IFA_CACHEINFO]);
4623 valid_lft = ci->ifa_valid;
4624 preferred_lft = ci->ifa_prefered;
4625 } else {
4626 preferred_lft = INFINITY_LIFE_TIME;
4627 valid_lft = INFINITY_LIFE_TIME;
4628 }
4629
4630 dev = __dev_get_by_index(net, ifm->ifa_index);
4631 if (!dev)
4632 return -ENODEV;
4633
4634 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4635
4636 /* We ignore other flags so far. */
4637 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4638 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4639
4640 idev = ipv6_find_idev(dev);
4641 if (IS_ERR(idev))
4642 return PTR_ERR(idev);
4643
4644 if (!ipv6_allow_optimistic_dad(net, idev))
4645 ifa_flags &= ~IFA_F_OPTIMISTIC;
4646
4647 if (ifa_flags & IFA_F_NODAD && ifa_flags & IFA_F_OPTIMISTIC) {
4648 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4649 return -EINVAL;
4650 }
4651
4652 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4653 if (!ifa) {
4654 /*
4655 * It would be best to check for !NLM_F_CREATE here but
4656 * userspace already relies on not having to provide this.
4657 */
4658 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4659 ifm->ifa_prefixlen, ifa_flags,
4660 preferred_lft, valid_lft, extack);
4661 }
4662
4663 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4664 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4665 err = -EEXIST;
4666 else
4667 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4668
4669 in6_ifa_put(ifa);
4670
4671 return err;
4672 }
4673
4674 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4675 u8 scope, int ifindex)
4676 {
4677 struct ifaddrmsg *ifm;
4678
4679 ifm = nlmsg_data(nlh);
4680 ifm->ifa_family = AF_INET6;
4681 ifm->ifa_prefixlen = prefixlen;
4682 ifm->ifa_flags = flags;
4683 ifm->ifa_scope = scope;
4684 ifm->ifa_index = ifindex;
4685 }
4686
4687 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4688 unsigned long tstamp, u32 preferred, u32 valid)
4689 {
4690 struct ifa_cacheinfo ci;
4691
4692 ci.cstamp = cstamp_delta(cstamp);
4693 ci.tstamp = cstamp_delta(tstamp);
4694 ci.ifa_prefered = preferred;
4695 ci.ifa_valid = valid;
4696
4697 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4698 }
4699
4700 static inline int rt_scope(int ifa_scope)
4701 {
4702 if (ifa_scope & IFA_HOST)
4703 return RT_SCOPE_HOST;
4704 else if (ifa_scope & IFA_LINK)
4705 return RT_SCOPE_LINK;
4706 else if (ifa_scope & IFA_SITE)
4707 return RT_SCOPE_SITE;
4708 else
4709 return RT_SCOPE_UNIVERSE;
4710 }
4711
4712 static inline int inet6_ifaddr_msgsize(void)
4713 {
4714 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4715 + nla_total_size(16) /* IFA_LOCAL */
4716 + nla_total_size(16) /* IFA_ADDRESS */
4717 + nla_total_size(sizeof(struct ifa_cacheinfo))
4718 + nla_total_size(4) /* IFA_FLAGS */;
4719 }
4720
4721 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4722 u32 portid, u32 seq, int event, unsigned int flags)
4723 {
4724 struct nlmsghdr *nlh;
4725 u32 preferred, valid;
4726
4727 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4728 if (!nlh)
4729 return -EMSGSIZE;
4730
4731 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4732 ifa->idev->dev->ifindex);
4733
4734 if (!((ifa->flags&IFA_F_PERMANENT) &&
4735 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4736 preferred = ifa->prefered_lft;
4737 valid = ifa->valid_lft;
4738 if (preferred != INFINITY_LIFE_TIME) {
4739 long tval = (jiffies - ifa->tstamp)/HZ;
4740 if (preferred > tval)
4741 preferred -= tval;
4742 else
4743 preferred = 0;
4744 if (valid != INFINITY_LIFE_TIME) {
4745 if (valid > tval)
4746 valid -= tval;
4747 else
4748 valid = 0;
4749 }
4750 }
4751 } else {
4752 preferred = INFINITY_LIFE_TIME;
4753 valid = INFINITY_LIFE_TIME;
4754 }
4755
4756 if (!ipv6_addr_any(&ifa->peer_addr)) {
4757 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4758 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4759 goto error;
4760 } else
4761 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4762 goto error;
4763
4764 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4765 goto error;
4766
4767 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4768 goto error;
4769
4770 nlmsg_end(skb, nlh);
4771 return 0;
4772
4773 error:
4774 nlmsg_cancel(skb, nlh);
4775 return -EMSGSIZE;
4776 }
4777
4778 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4779 u32 portid, u32 seq, int event, u16 flags)
4780 {
4781 struct nlmsghdr *nlh;
4782 u8 scope = RT_SCOPE_UNIVERSE;
4783 int ifindex = ifmca->idev->dev->ifindex;
4784
4785 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4786 scope = RT_SCOPE_SITE;
4787
4788 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4789 if (!nlh)
4790 return -EMSGSIZE;
4791
4792 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4793 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4794 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4795 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4796 nlmsg_cancel(skb, nlh);
4797 return -EMSGSIZE;
4798 }
4799
4800 nlmsg_end(skb, nlh);
4801 return 0;
4802 }
4803
4804 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4805 u32 portid, u32 seq, int event, unsigned int flags)
4806 {
4807 struct nlmsghdr *nlh;
4808 u8 scope = RT_SCOPE_UNIVERSE;
4809 int ifindex = ifaca->aca_idev->dev->ifindex;
4810
4811 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4812 scope = RT_SCOPE_SITE;
4813
4814 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4815 if (!nlh)
4816 return -EMSGSIZE;
4817
4818 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4819 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4820 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4821 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4822 nlmsg_cancel(skb, nlh);
4823 return -EMSGSIZE;
4824 }
4825
4826 nlmsg_end(skb, nlh);
4827 return 0;
4828 }
4829
4830 enum addr_type_t {
4831 UNICAST_ADDR,
4832 MULTICAST_ADDR,
4833 ANYCAST_ADDR,
4834 };
4835
4836 /* called with rcu_read_lock() */
4837 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4838 struct netlink_callback *cb, enum addr_type_t type,
4839 int s_ip_idx, int *p_ip_idx)
4840 {
4841 struct ifmcaddr6 *ifmca;
4842 struct ifacaddr6 *ifaca;
4843 int err = 1;
4844 int ip_idx = *p_ip_idx;
4845
4846 read_lock_bh(&idev->lock);
4847 switch (type) {
4848 case UNICAST_ADDR: {
4849 struct inet6_ifaddr *ifa;
4850
4851 /* unicast address incl. temp addr */
4852 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4853 if (++ip_idx < s_ip_idx)
4854 continue;
4855 err = inet6_fill_ifaddr(skb, ifa,
4856 NETLINK_CB(cb->skb).portid,
4857 cb->nlh->nlmsg_seq,
4858 RTM_NEWADDR,
4859 NLM_F_MULTI);
4860 if (err < 0)
4861 break;
4862 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4863 }
4864 break;
4865 }
4866 case MULTICAST_ADDR:
4867 /* multicast address */
4868 for (ifmca = idev->mc_list; ifmca;
4869 ifmca = ifmca->next, ip_idx++) {
4870 if (ip_idx < s_ip_idx)
4871 continue;
4872 err = inet6_fill_ifmcaddr(skb, ifmca,
4873 NETLINK_CB(cb->skb).portid,
4874 cb->nlh->nlmsg_seq,
4875 RTM_GETMULTICAST,
4876 NLM_F_MULTI);
4877 if (err < 0)
4878 break;
4879 }
4880 break;
4881 case ANYCAST_ADDR:
4882 /* anycast address */
4883 for (ifaca = idev->ac_list; ifaca;
4884 ifaca = ifaca->aca_next, ip_idx++) {
4885 if (ip_idx < s_ip_idx)
4886 continue;
4887 err = inet6_fill_ifacaddr(skb, ifaca,
4888 NETLINK_CB(cb->skb).portid,
4889 cb->nlh->nlmsg_seq,
4890 RTM_GETANYCAST,
4891 NLM_F_MULTI);
4892 if (err < 0)
4893 break;
4894 }
4895 break;
4896 default:
4897 break;
4898 }
4899 read_unlock_bh(&idev->lock);
4900 *p_ip_idx = ip_idx;
4901 return err;
4902 }
4903
4904 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4905 enum addr_type_t type)
4906 {
4907 struct net *net = sock_net(skb->sk);
4908 int h, s_h;
4909 int idx, ip_idx;
4910 int s_idx, s_ip_idx;
4911 struct net_device *dev;
4912 struct inet6_dev *idev;
4913 struct hlist_head *head;
4914
4915 s_h = cb->args[0];
4916 s_idx = idx = cb->args[1];
4917 s_ip_idx = ip_idx = cb->args[2];
4918
4919 rcu_read_lock();
4920 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4921 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4922 idx = 0;
4923 head = &net->dev_index_head[h];
4924 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4925 if (idx < s_idx)
4926 goto cont;
4927 if (h > s_h || idx > s_idx)
4928 s_ip_idx = 0;
4929 ip_idx = 0;
4930 idev = __in6_dev_get(dev);
4931 if (!idev)
4932 goto cont;
4933
4934 if (in6_dump_addrs(idev, skb, cb, type,
4935 s_ip_idx, &ip_idx) < 0)
4936 goto done;
4937 cont:
4938 idx++;
4939 }
4940 }
4941 done:
4942 rcu_read_unlock();
4943 cb->args[0] = h;
4944 cb->args[1] = idx;
4945 cb->args[2] = ip_idx;
4946
4947 return skb->len;
4948 }
4949
4950 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4951 {
4952 enum addr_type_t type = UNICAST_ADDR;
4953
4954 return inet6_dump_addr(skb, cb, type);
4955 }
4956
4957 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4958 {
4959 enum addr_type_t type = MULTICAST_ADDR;
4960
4961 return inet6_dump_addr(skb, cb, type);
4962 }
4963
4964
4965 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4966 {
4967 enum addr_type_t type = ANYCAST_ADDR;
4968
4969 return inet6_dump_addr(skb, cb, type);
4970 }
4971
4972 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4973 struct netlink_ext_ack *extack)
4974 {
4975 struct net *net = sock_net(in_skb->sk);
4976 struct ifaddrmsg *ifm;
4977 struct nlattr *tb[IFA_MAX+1];
4978 struct in6_addr *addr = NULL, *peer;
4979 struct net_device *dev = NULL;
4980 struct inet6_ifaddr *ifa;
4981 struct sk_buff *skb;
4982 int err;
4983
4984 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4985 extack);
4986 if (err < 0)
4987 return err;
4988
4989 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4990 if (!addr)
4991 return -EINVAL;
4992
4993 ifm = nlmsg_data(nlh);
4994 if (ifm->ifa_index)
4995 dev = dev_get_by_index(net, ifm->ifa_index);
4996
4997 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4998 if (!ifa) {
4999 err = -EADDRNOTAVAIL;
5000 goto errout;
5001 }
5002
5003 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5004 if (!skb) {
5005 err = -ENOBUFS;
5006 goto errout_ifa;
5007 }
5008
5009 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
5010 nlh->nlmsg_seq, RTM_NEWADDR, 0);
5011 if (err < 0) {
5012 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5013 WARN_ON(err == -EMSGSIZE);
5014 kfree_skb(skb);
5015 goto errout_ifa;
5016 }
5017 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
5018 errout_ifa:
5019 in6_ifa_put(ifa);
5020 errout:
5021 if (dev)
5022 dev_put(dev);
5023 return err;
5024 }
5025
5026 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5027 {
5028 struct sk_buff *skb;
5029 struct net *net = dev_net(ifa->idev->dev);
5030 int err = -ENOBUFS;
5031
5032 /* Don't send DELADDR notification for TENTATIVE address,
5033 * since NEWADDR notification is sent only after removing
5034 * TENTATIVE flag, if DAD has not failed.
5035 */
5036 if (ifa->flags & IFA_F_TENTATIVE && !(ifa->flags & IFA_F_DADFAILED) &&
5037 event == RTM_DELADDR)
5038 return;
5039
5040 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5041 if (!skb)
5042 goto errout;
5043
5044 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
5045 if (err < 0) {
5046 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5047 WARN_ON(err == -EMSGSIZE);
5048 kfree_skb(skb);
5049 goto errout;
5050 }
5051 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5052 return;
5053 errout:
5054 if (err < 0)
5055 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5056 }
5057
5058 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5059 __s32 *array, int bytes)
5060 {
5061 BUG_ON(bytes < (DEVCONF_MAX * 4));
5062
5063 memset(array, 0, bytes);
5064 array[DEVCONF_FORWARDING] = cnf->forwarding;
5065 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5066 array[DEVCONF_MTU6] = cnf->mtu6;
5067 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5068 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5069 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5070 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5071 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5072 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5073 jiffies_to_msecs(cnf->rtr_solicit_interval);
5074 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5075 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5076 array[DEVCONF_RTR_SOLICIT_DELAY] =
5077 jiffies_to_msecs(cnf->rtr_solicit_delay);
5078 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5079 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5080 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5081 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5082 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5083 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5084 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5085 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5086 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5087 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5088 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5089 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5090 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5091 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5092 #ifdef CONFIG_IPV6_ROUTER_PREF
5093 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5094 array[DEVCONF_RTR_PROBE_INTERVAL] =
5095 jiffies_to_msecs(cnf->rtr_probe_interval);
5096 #ifdef CONFIG_IPV6_ROUTE_INFO
5097 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5098 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5099 #endif
5100 #endif
5101 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5102 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5103 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5104 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5105 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5106 #endif
5107 #ifdef CONFIG_IPV6_MROUTE
5108 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5109 #endif
5110 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5111 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5112 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5113 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5114 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5115 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5116 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5117 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5118 /* we omit DEVCONF_STABLE_SECRET for now */
5119 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5120 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5121 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5122 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5123 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5124 #ifdef CONFIG_IPV6_SEG6_HMAC
5125 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5126 #endif
5127 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5128 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5129 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5130 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5131 }
5132
5133 static inline size_t inet6_ifla6_size(void)
5134 {
5135 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5136 + nla_total_size(sizeof(struct ifla_cacheinfo))
5137 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5138 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5139 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5140 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5141 }
5142
5143 static inline size_t inet6_if_nlmsg_size(void)
5144 {
5145 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5146 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5147 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5148 + nla_total_size(4) /* IFLA_MTU */
5149 + nla_total_size(4) /* IFLA_LINK */
5150 + nla_total_size(1) /* IFLA_OPERSTATE */
5151 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5152 }
5153
5154 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5155 int bytes)
5156 {
5157 int i;
5158 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5159 BUG_ON(pad < 0);
5160
5161 /* Use put_unaligned() because stats may not be aligned for u64. */
5162 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5163 for (i = 1; i < ICMP6_MIB_MAX; i++)
5164 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5165
5166 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5167 }
5168
5169 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5170 int bytes, size_t syncpoff)
5171 {
5172 int i, c;
5173 u64 buff[IPSTATS_MIB_MAX];
5174 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5175
5176 BUG_ON(pad < 0);
5177
5178 memset(buff, 0, sizeof(buff));
5179 buff[0] = IPSTATS_MIB_MAX;
5180
5181 for_each_possible_cpu(c) {
5182 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5183 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5184 }
5185
5186 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5187 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5188 }
5189
5190 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5191 int bytes)
5192 {
5193 switch (attrtype) {
5194 case IFLA_INET6_STATS:
5195 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5196 offsetof(struct ipstats_mib, syncp));
5197 break;
5198 case IFLA_INET6_ICMP6STATS:
5199 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5200 break;
5201 }
5202 }
5203
5204 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5205 u32 ext_filter_mask)
5206 {
5207 struct nlattr *nla;
5208 struct ifla_cacheinfo ci;
5209
5210 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5211 goto nla_put_failure;
5212 ci.max_reasm_len = IPV6_MAXPLEN;
5213 ci.tstamp = cstamp_delta(idev->tstamp);
5214 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5215 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5216 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5217 goto nla_put_failure;
5218 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5219 if (!nla)
5220 goto nla_put_failure;
5221 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5222
5223 /* XXX - MC not implemented */
5224
5225 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5226 return 0;
5227
5228 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5229 if (!nla)
5230 goto nla_put_failure;
5231 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5232
5233 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5234 if (!nla)
5235 goto nla_put_failure;
5236 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5237
5238 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5239 if (!nla)
5240 goto nla_put_failure;
5241
5242 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5243 goto nla_put_failure;
5244
5245 read_lock_bh(&idev->lock);
5246 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5247 read_unlock_bh(&idev->lock);
5248
5249 return 0;
5250
5251 nla_put_failure:
5252 return -EMSGSIZE;
5253 }
5254
5255 static size_t inet6_get_link_af_size(const struct net_device *dev,
5256 u32 ext_filter_mask)
5257 {
5258 if (!__in6_dev_get(dev))
5259 return 0;
5260
5261 return inet6_ifla6_size();
5262 }
5263
5264 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5265 u32 ext_filter_mask)
5266 {
5267 struct inet6_dev *idev = __in6_dev_get(dev);
5268
5269 if (!idev)
5270 return -ENODATA;
5271
5272 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5273 return -EMSGSIZE;
5274
5275 return 0;
5276 }
5277
5278 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5279 {
5280 struct inet6_ifaddr *ifp;
5281 struct net_device *dev = idev->dev;
5282 bool clear_token, update_rs = false;
5283 struct in6_addr ll_addr;
5284
5285 ASSERT_RTNL();
5286
5287 if (!token)
5288 return -EINVAL;
5289 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5290 return -EINVAL;
5291 if (!ipv6_accept_ra(idev))
5292 return -EINVAL;
5293 if (idev->cnf.rtr_solicits == 0)
5294 return -EINVAL;
5295
5296 write_lock_bh(&idev->lock);
5297
5298 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5299 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5300
5301 write_unlock_bh(&idev->lock);
5302
5303 clear_token = ipv6_addr_any(token);
5304 if (clear_token)
5305 goto update_lft;
5306
5307 if (!idev->dead && (idev->if_flags & IF_READY) &&
5308 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5309 IFA_F_OPTIMISTIC)) {
5310 /* If we're not ready, then normal ifup will take care
5311 * of this. Otherwise, we need to request our rs here.
5312 */
5313 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5314 update_rs = true;
5315 }
5316
5317 update_lft:
5318 write_lock_bh(&idev->lock);
5319
5320 if (update_rs) {
5321 idev->if_flags |= IF_RS_SENT;
5322 idev->rs_interval = rfc3315_s14_backoff_init(
5323 idev->cnf.rtr_solicit_interval);
5324 idev->rs_probes = 1;
5325 addrconf_mod_rs_timer(idev, idev->rs_interval);
5326 }
5327
5328 /* Well, that's kinda nasty ... */
5329 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5330 spin_lock(&ifp->lock);
5331 if (ifp->tokenized) {
5332 ifp->valid_lft = 0;
5333 ifp->prefered_lft = 0;
5334 }
5335 spin_unlock(&ifp->lock);
5336 }
5337
5338 write_unlock_bh(&idev->lock);
5339 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5340 addrconf_verify_rtnl();
5341 return 0;
5342 }
5343
5344 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5345 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5346 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5347 };
5348
5349 static int inet6_validate_link_af(const struct net_device *dev,
5350 const struct nlattr *nla)
5351 {
5352 struct nlattr *tb[IFLA_INET6_MAX + 1];
5353
5354 if (dev && !__in6_dev_get(dev))
5355 return -EAFNOSUPPORT;
5356
5357 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5358 NULL);
5359 }
5360
5361 static int check_addr_gen_mode(int mode)
5362 {
5363 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5364 mode != IN6_ADDR_GEN_MODE_NONE &&
5365 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5366 mode != IN6_ADDR_GEN_MODE_RANDOM)
5367 return -EINVAL;
5368 return 1;
5369 }
5370
5371 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5372 int mode)
5373 {
5374 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5375 !idev->cnf.stable_secret.initialized &&
5376 !net->ipv6.devconf_dflt->stable_secret.initialized)
5377 return -EINVAL;
5378 return 1;
5379 }
5380
5381 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5382 {
5383 int err = -EINVAL;
5384 struct inet6_dev *idev = __in6_dev_get(dev);
5385 struct nlattr *tb[IFLA_INET6_MAX + 1];
5386
5387 if (!idev)
5388 return -EAFNOSUPPORT;
5389
5390 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5391 BUG();
5392
5393 if (tb[IFLA_INET6_TOKEN]) {
5394 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5395 if (err)
5396 return err;
5397 }
5398
5399 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5400 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5401
5402 if (check_addr_gen_mode(mode) < 0 ||
5403 check_stable_privacy(idev, dev_net(dev), mode) < 0)
5404 return -EINVAL;
5405
5406 idev->cnf.addr_gen_mode = mode;
5407 err = 0;
5408 }
5409
5410 return err;
5411 }
5412
5413 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5414 u32 portid, u32 seq, int event, unsigned int flags)
5415 {
5416 struct net_device *dev = idev->dev;
5417 struct ifinfomsg *hdr;
5418 struct nlmsghdr *nlh;
5419 void *protoinfo;
5420
5421 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5422 if (!nlh)
5423 return -EMSGSIZE;
5424
5425 hdr = nlmsg_data(nlh);
5426 hdr->ifi_family = AF_INET6;
5427 hdr->__ifi_pad = 0;
5428 hdr->ifi_type = dev->type;
5429 hdr->ifi_index = dev->ifindex;
5430 hdr->ifi_flags = dev_get_flags(dev);
5431 hdr->ifi_change = 0;
5432
5433 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5434 (dev->addr_len &&
5435 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5436 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5437 (dev->ifindex != dev_get_iflink(dev) &&
5438 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5439 nla_put_u8(skb, IFLA_OPERSTATE,
5440 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5441 goto nla_put_failure;
5442 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5443 if (!protoinfo)
5444 goto nla_put_failure;
5445
5446 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5447 goto nla_put_failure;
5448
5449 nla_nest_end(skb, protoinfo);
5450 nlmsg_end(skb, nlh);
5451 return 0;
5452
5453 nla_put_failure:
5454 nlmsg_cancel(skb, nlh);
5455 return -EMSGSIZE;
5456 }
5457
5458 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5459 {
5460 struct net *net = sock_net(skb->sk);
5461 int h, s_h;
5462 int idx = 0, s_idx;
5463 struct net_device *dev;
5464 struct inet6_dev *idev;
5465 struct hlist_head *head;
5466
5467 s_h = cb->args[0];
5468 s_idx = cb->args[1];
5469
5470 rcu_read_lock();
5471 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5472 idx = 0;
5473 head = &net->dev_index_head[h];
5474 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5475 if (idx < s_idx)
5476 goto cont;
5477 idev = __in6_dev_get(dev);
5478 if (!idev)
5479 goto cont;
5480 if (inet6_fill_ifinfo(skb, idev,
5481 NETLINK_CB(cb->skb).portid,
5482 cb->nlh->nlmsg_seq,
5483 RTM_NEWLINK, NLM_F_MULTI) < 0)
5484 goto out;
5485 cont:
5486 idx++;
5487 }
5488 }
5489 out:
5490 rcu_read_unlock();
5491 cb->args[1] = idx;
5492 cb->args[0] = h;
5493
5494 return skb->len;
5495 }
5496
5497 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5498 {
5499 struct sk_buff *skb;
5500 struct net *net = dev_net(idev->dev);
5501 int err = -ENOBUFS;
5502
5503 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5504 if (!skb)
5505 goto errout;
5506
5507 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5508 if (err < 0) {
5509 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5510 WARN_ON(err == -EMSGSIZE);
5511 kfree_skb(skb);
5512 goto errout;
5513 }
5514 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5515 return;
5516 errout:
5517 if (err < 0)
5518 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5519 }
5520
5521 static inline size_t inet6_prefix_nlmsg_size(void)
5522 {
5523 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5524 + nla_total_size(sizeof(struct in6_addr))
5525 + nla_total_size(sizeof(struct prefix_cacheinfo));
5526 }
5527
5528 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5529 struct prefix_info *pinfo, u32 portid, u32 seq,
5530 int event, unsigned int flags)
5531 {
5532 struct prefixmsg *pmsg;
5533 struct nlmsghdr *nlh;
5534 struct prefix_cacheinfo ci;
5535
5536 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5537 if (!nlh)
5538 return -EMSGSIZE;
5539
5540 pmsg = nlmsg_data(nlh);
5541 pmsg->prefix_family = AF_INET6;
5542 pmsg->prefix_pad1 = 0;
5543 pmsg->prefix_pad2 = 0;
5544 pmsg->prefix_ifindex = idev->dev->ifindex;
5545 pmsg->prefix_len = pinfo->prefix_len;
5546 pmsg->prefix_type = pinfo->type;
5547 pmsg->prefix_pad3 = 0;
5548 pmsg->prefix_flags = 0;
5549 if (pinfo->onlink)
5550 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5551 if (pinfo->autoconf)
5552 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5553
5554 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5555 goto nla_put_failure;
5556 ci.preferred_time = ntohl(pinfo->prefered);
5557 ci.valid_time = ntohl(pinfo->valid);
5558 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5559 goto nla_put_failure;
5560 nlmsg_end(skb, nlh);
5561 return 0;
5562
5563 nla_put_failure:
5564 nlmsg_cancel(skb, nlh);
5565 return -EMSGSIZE;
5566 }
5567
5568 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5569 struct prefix_info *pinfo)
5570 {
5571 struct sk_buff *skb;
5572 struct net *net = dev_net(idev->dev);
5573 int err = -ENOBUFS;
5574
5575 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5576 if (!skb)
5577 goto errout;
5578
5579 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5580 if (err < 0) {
5581 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5582 WARN_ON(err == -EMSGSIZE);
5583 kfree_skb(skb);
5584 goto errout;
5585 }
5586 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5587 return;
5588 errout:
5589 if (err < 0)
5590 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5591 }
5592
5593 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5594 {
5595 struct net *net = dev_net(ifp->idev->dev);
5596
5597 if (event)
5598 ASSERT_RTNL();
5599
5600 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5601
5602 switch (event) {
5603 case RTM_NEWADDR:
5604 /*
5605 * If the address was optimistic
5606 * we inserted the route at the start of
5607 * our DAD process, so we don't need
5608 * to do it again
5609 */
5610 if (!rcu_access_pointer(ifp->rt->rt6i_node))
5611 ip6_ins_rt(ifp->rt);
5612 if (ifp->idev->cnf.forwarding)
5613 addrconf_join_anycast(ifp);
5614 if (!ipv6_addr_any(&ifp->peer_addr))
5615 addrconf_prefix_route(&ifp->peer_addr, 128,
5616 ifp->idev->dev, 0, 0);
5617 break;
5618 case RTM_DELADDR:
5619 if (ifp->idev->cnf.forwarding)
5620 addrconf_leave_anycast(ifp);
5621 addrconf_leave_solict(ifp->idev, &ifp->addr);
5622 if (!ipv6_addr_any(&ifp->peer_addr)) {
5623 struct rt6_info *rt;
5624
5625 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5626 ifp->idev->dev, 0, 0);
5627 if (rt)
5628 ip6_del_rt(rt);
5629 }
5630 if (ifp->rt) {
5631 if (dst_hold_safe(&ifp->rt->dst))
5632 ip6_del_rt(ifp->rt);
5633 }
5634 rt_genid_bump_ipv6(net);
5635 break;
5636 }
5637 atomic_inc(&net->ipv6.dev_addr_genid);
5638 }
5639
5640 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5641 {
5642 rcu_read_lock_bh();
5643 if (likely(ifp->idev->dead == 0))
5644 __ipv6_ifa_notify(event, ifp);
5645 rcu_read_unlock_bh();
5646 }
5647
5648 #ifdef CONFIG_SYSCTL
5649
5650 static
5651 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5652 void __user *buffer, size_t *lenp, loff_t *ppos)
5653 {
5654 int *valp = ctl->data;
5655 int val = *valp;
5656 loff_t pos = *ppos;
5657 struct ctl_table lctl;
5658 int ret;
5659
5660 /*
5661 * ctl->data points to idev->cnf.forwarding, we should
5662 * not modify it until we get the rtnl lock.
5663 */
5664 lctl = *ctl;
5665 lctl.data = &val;
5666
5667 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5668
5669 if (write)
5670 ret = addrconf_fixup_forwarding(ctl, valp, val);
5671 if (ret)
5672 *ppos = pos;
5673 return ret;
5674 }
5675
5676 static
5677 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5678 void __user *buffer, size_t *lenp, loff_t *ppos)
5679 {
5680 struct inet6_dev *idev = ctl->extra1;
5681 int min_mtu = IPV6_MIN_MTU;
5682 struct ctl_table lctl;
5683
5684 lctl = *ctl;
5685 lctl.extra1 = &min_mtu;
5686 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5687
5688 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5689 }
5690
5691 static void dev_disable_change(struct inet6_dev *idev)
5692 {
5693 struct netdev_notifier_info info;
5694
5695 if (!idev || !idev->dev)
5696 return;
5697
5698 netdev_notifier_info_init(&info, idev->dev);
5699 if (idev->cnf.disable_ipv6)
5700 addrconf_notify(NULL, NETDEV_DOWN, &info);
5701 else
5702 addrconf_notify(NULL, NETDEV_UP, &info);
5703 }
5704
5705 static void addrconf_disable_change(struct net *net, __s32 newf)
5706 {
5707 struct net_device *dev;
5708 struct inet6_dev *idev;
5709
5710 for_each_netdev(net, dev) {
5711 idev = __in6_dev_get(dev);
5712 if (idev) {
5713 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5714 idev->cnf.disable_ipv6 = newf;
5715 if (changed)
5716 dev_disable_change(idev);
5717 }
5718 }
5719 }
5720
5721 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5722 {
5723 struct net *net;
5724 int old;
5725
5726 if (!rtnl_trylock())
5727 return restart_syscall();
5728
5729 net = (struct net *)table->extra2;
5730 old = *p;
5731 *p = newf;
5732
5733 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5734 rtnl_unlock();
5735 return 0;
5736 }
5737
5738 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5739 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5740 addrconf_disable_change(net, newf);
5741 } else if ((!newf) ^ (!old))
5742 dev_disable_change((struct inet6_dev *)table->extra1);
5743
5744 rtnl_unlock();
5745 return 0;
5746 }
5747
5748 static
5749 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5750 void __user *buffer, size_t *lenp, loff_t *ppos)
5751 {
5752 int *valp = ctl->data;
5753 int val = *valp;
5754 loff_t pos = *ppos;
5755 struct ctl_table lctl;
5756 int ret;
5757
5758 /*
5759 * ctl->data points to idev->cnf.disable_ipv6, we should
5760 * not modify it until we get the rtnl lock.
5761 */
5762 lctl = *ctl;
5763 lctl.data = &val;
5764
5765 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5766
5767 if (write)
5768 ret = addrconf_disable_ipv6(ctl, valp, val);
5769 if (ret)
5770 *ppos = pos;
5771 return ret;
5772 }
5773
5774 static
5775 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5776 void __user *buffer, size_t *lenp, loff_t *ppos)
5777 {
5778 int *valp = ctl->data;
5779 int ret;
5780 int old, new;
5781
5782 old = *valp;
5783 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5784 new = *valp;
5785
5786 if (write && old != new) {
5787 struct net *net = ctl->extra2;
5788
5789 if (!rtnl_trylock())
5790 return restart_syscall();
5791
5792 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5793 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5794 NETCONFA_PROXY_NEIGH,
5795 NETCONFA_IFINDEX_DEFAULT,
5796 net->ipv6.devconf_dflt);
5797 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5798 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5799 NETCONFA_PROXY_NEIGH,
5800 NETCONFA_IFINDEX_ALL,
5801 net->ipv6.devconf_all);
5802 else {
5803 struct inet6_dev *idev = ctl->extra1;
5804
5805 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5806 NETCONFA_PROXY_NEIGH,
5807 idev->dev->ifindex,
5808 &idev->cnf);
5809 }
5810 rtnl_unlock();
5811 }
5812
5813 return ret;
5814 }
5815
5816 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5817 void __user *buffer, size_t *lenp,
5818 loff_t *ppos)
5819 {
5820 int ret = 0;
5821 int new_val;
5822 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5823 struct net *net = (struct net *)ctl->extra2;
5824
5825 if (!rtnl_trylock())
5826 return restart_syscall();
5827
5828 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5829
5830 if (write) {
5831 new_val = *((int *)ctl->data);
5832
5833 if (check_addr_gen_mode(new_val) < 0) {
5834 ret = -EINVAL;
5835 goto out;
5836 }
5837
5838 /* request for default */
5839 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5840 ipv6_devconf_dflt.addr_gen_mode = new_val;
5841
5842 /* request for individual net device */
5843 } else {
5844 if (!idev)
5845 goto out;
5846
5847 if (check_stable_privacy(idev, net, new_val) < 0) {
5848 ret = -EINVAL;
5849 goto out;
5850 }
5851
5852 if (idev->cnf.addr_gen_mode != new_val) {
5853 idev->cnf.addr_gen_mode = new_val;
5854 addrconf_dev_config(idev->dev);
5855 }
5856 }
5857 }
5858
5859 out:
5860 rtnl_unlock();
5861
5862 return ret;
5863 }
5864
5865 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5866 void __user *buffer, size_t *lenp,
5867 loff_t *ppos)
5868 {
5869 int err;
5870 struct in6_addr addr;
5871 char str[IPV6_MAX_STRLEN];
5872 struct ctl_table lctl = *ctl;
5873 struct net *net = ctl->extra2;
5874 struct ipv6_stable_secret *secret = ctl->data;
5875
5876 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5877 return -EIO;
5878
5879 lctl.maxlen = IPV6_MAX_STRLEN;
5880 lctl.data = str;
5881
5882 if (!rtnl_trylock())
5883 return restart_syscall();
5884
5885 if (!write && !secret->initialized) {
5886 err = -EIO;
5887 goto out;
5888 }
5889
5890 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5891 if (err >= sizeof(str)) {
5892 err = -EIO;
5893 goto out;
5894 }
5895
5896 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5897 if (err || !write)
5898 goto out;
5899
5900 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5901 err = -EIO;
5902 goto out;
5903 }
5904
5905 secret->initialized = true;
5906 secret->secret = addr;
5907
5908 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5909 struct net_device *dev;
5910
5911 for_each_netdev(net, dev) {
5912 struct inet6_dev *idev = __in6_dev_get(dev);
5913
5914 if (idev) {
5915 idev->cnf.addr_gen_mode =
5916 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5917 }
5918 }
5919 } else {
5920 struct inet6_dev *idev = ctl->extra1;
5921
5922 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5923 }
5924
5925 out:
5926 rtnl_unlock();
5927
5928 return err;
5929 }
5930
5931 static
5932 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5933 int write,
5934 void __user *buffer,
5935 size_t *lenp,
5936 loff_t *ppos)
5937 {
5938 int *valp = ctl->data;
5939 int val = *valp;
5940 loff_t pos = *ppos;
5941 struct ctl_table lctl;
5942 int ret;
5943
5944 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5945 * we should not modify it until we get the rtnl lock.
5946 */
5947 lctl = *ctl;
5948 lctl.data = &val;
5949
5950 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5951
5952 if (write)
5953 ret = addrconf_fixup_linkdown(ctl, valp, val);
5954 if (ret)
5955 *ppos = pos;
5956 return ret;
5957 }
5958
5959 static
5960 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5961 {
5962 if (rt) {
5963 if (action)
5964 rt->dst.flags |= DST_NOPOLICY;
5965 else
5966 rt->dst.flags &= ~DST_NOPOLICY;
5967 }
5968 }
5969
5970 static
5971 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5972 {
5973 struct inet6_ifaddr *ifa;
5974
5975 read_lock_bh(&idev->lock);
5976 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5977 spin_lock(&ifa->lock);
5978 if (ifa->rt) {
5979 struct rt6_info *rt = ifa->rt;
5980 int cpu;
5981
5982 rcu_read_lock();
5983 addrconf_set_nopolicy(ifa->rt, val);
5984 if (rt->rt6i_pcpu) {
5985 for_each_possible_cpu(cpu) {
5986 struct rt6_info **rtp;
5987
5988 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5989 addrconf_set_nopolicy(*rtp, val);
5990 }
5991 }
5992 rcu_read_unlock();
5993 }
5994 spin_unlock(&ifa->lock);
5995 }
5996 read_unlock_bh(&idev->lock);
5997 }
5998
5999 static
6000 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6001 {
6002 struct inet6_dev *idev;
6003 struct net *net;
6004
6005 if (!rtnl_trylock())
6006 return restart_syscall();
6007
6008 *valp = val;
6009
6010 net = (struct net *)ctl->extra2;
6011 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6012 rtnl_unlock();
6013 return 0;
6014 }
6015
6016 if (valp == &net->ipv6.devconf_all->disable_policy) {
6017 struct net_device *dev;
6018
6019 for_each_netdev(net, dev) {
6020 idev = __in6_dev_get(dev);
6021 if (idev)
6022 addrconf_disable_policy_idev(idev, val);
6023 }
6024 } else {
6025 idev = (struct inet6_dev *)ctl->extra1;
6026 addrconf_disable_policy_idev(idev, val);
6027 }
6028
6029 rtnl_unlock();
6030 return 0;
6031 }
6032
6033 static
6034 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6035 void __user *buffer, size_t *lenp,
6036 loff_t *ppos)
6037 {
6038 int *valp = ctl->data;
6039 int val = *valp;
6040 loff_t pos = *ppos;
6041 struct ctl_table lctl;
6042 int ret;
6043
6044 lctl = *ctl;
6045 lctl.data = &val;
6046 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6047
6048 if (write && (*valp != val))
6049 ret = addrconf_disable_policy(ctl, valp, val);
6050
6051 if (ret)
6052 *ppos = pos;
6053
6054 return ret;
6055 }
6056
6057 static int minus_one = -1;
6058 static const int zero = 0;
6059 static const int one = 1;
6060 static const int two_five_five = 255;
6061
6062 static const struct ctl_table addrconf_sysctl[] = {
6063 {
6064 .procname = "forwarding",
6065 .data = &ipv6_devconf.forwarding,
6066 .maxlen = sizeof(int),
6067 .mode = 0644,
6068 .proc_handler = addrconf_sysctl_forward,
6069 },
6070 {
6071 .procname = "hop_limit",
6072 .data = &ipv6_devconf.hop_limit,
6073 .maxlen = sizeof(int),
6074 .mode = 0644,
6075 .proc_handler = proc_dointvec_minmax,
6076 .extra1 = (void *)&one,
6077 .extra2 = (void *)&two_five_five,
6078 },
6079 {
6080 .procname = "mtu",
6081 .data = &ipv6_devconf.mtu6,
6082 .maxlen = sizeof(int),
6083 .mode = 0644,
6084 .proc_handler = addrconf_sysctl_mtu,
6085 },
6086 {
6087 .procname = "accept_ra",
6088 .data = &ipv6_devconf.accept_ra,
6089 .maxlen = sizeof(int),
6090 .mode = 0644,
6091 .proc_handler = proc_dointvec,
6092 },
6093 {
6094 .procname = "accept_redirects",
6095 .data = &ipv6_devconf.accept_redirects,
6096 .maxlen = sizeof(int),
6097 .mode = 0644,
6098 .proc_handler = proc_dointvec,
6099 },
6100 {
6101 .procname = "autoconf",
6102 .data = &ipv6_devconf.autoconf,
6103 .maxlen = sizeof(int),
6104 .mode = 0644,
6105 .proc_handler = proc_dointvec,
6106 },
6107 {
6108 .procname = "dad_transmits",
6109 .data = &ipv6_devconf.dad_transmits,
6110 .maxlen = sizeof(int),
6111 .mode = 0644,
6112 .proc_handler = proc_dointvec,
6113 },
6114 {
6115 .procname = "router_solicitations",
6116 .data = &ipv6_devconf.rtr_solicits,
6117 .maxlen = sizeof(int),
6118 .mode = 0644,
6119 .proc_handler = proc_dointvec_minmax,
6120 .extra1 = &minus_one,
6121 },
6122 {
6123 .procname = "router_solicitation_interval",
6124 .data = &ipv6_devconf.rtr_solicit_interval,
6125 .maxlen = sizeof(int),
6126 .mode = 0644,
6127 .proc_handler = proc_dointvec_jiffies,
6128 },
6129 {
6130 .procname = "router_solicitation_max_interval",
6131 .data = &ipv6_devconf.rtr_solicit_max_interval,
6132 .maxlen = sizeof(int),
6133 .mode = 0644,
6134 .proc_handler = proc_dointvec_jiffies,
6135 },
6136 {
6137 .procname = "router_solicitation_delay",
6138 .data = &ipv6_devconf.rtr_solicit_delay,
6139 .maxlen = sizeof(int),
6140 .mode = 0644,
6141 .proc_handler = proc_dointvec_jiffies,
6142 },
6143 {
6144 .procname = "force_mld_version",
6145 .data = &ipv6_devconf.force_mld_version,
6146 .maxlen = sizeof(int),
6147 .mode = 0644,
6148 .proc_handler = proc_dointvec,
6149 },
6150 {
6151 .procname = "mldv1_unsolicited_report_interval",
6152 .data =
6153 &ipv6_devconf.mldv1_unsolicited_report_interval,
6154 .maxlen = sizeof(int),
6155 .mode = 0644,
6156 .proc_handler = proc_dointvec_ms_jiffies,
6157 },
6158 {
6159 .procname = "mldv2_unsolicited_report_interval",
6160 .data =
6161 &ipv6_devconf.mldv2_unsolicited_report_interval,
6162 .maxlen = sizeof(int),
6163 .mode = 0644,
6164 .proc_handler = proc_dointvec_ms_jiffies,
6165 },
6166 {
6167 .procname = "use_tempaddr",
6168 .data = &ipv6_devconf.use_tempaddr,
6169 .maxlen = sizeof(int),
6170 .mode = 0644,
6171 .proc_handler = proc_dointvec,
6172 },
6173 {
6174 .procname = "temp_valid_lft",
6175 .data = &ipv6_devconf.temp_valid_lft,
6176 .maxlen = sizeof(int),
6177 .mode = 0644,
6178 .proc_handler = proc_dointvec,
6179 },
6180 {
6181 .procname = "temp_prefered_lft",
6182 .data = &ipv6_devconf.temp_prefered_lft,
6183 .maxlen = sizeof(int),
6184 .mode = 0644,
6185 .proc_handler = proc_dointvec,
6186 },
6187 {
6188 .procname = "regen_max_retry",
6189 .data = &ipv6_devconf.regen_max_retry,
6190 .maxlen = sizeof(int),
6191 .mode = 0644,
6192 .proc_handler = proc_dointvec,
6193 },
6194 {
6195 .procname = "max_desync_factor",
6196 .data = &ipv6_devconf.max_desync_factor,
6197 .maxlen = sizeof(int),
6198 .mode = 0644,
6199 .proc_handler = proc_dointvec,
6200 },
6201 {
6202 .procname = "max_addresses",
6203 .data = &ipv6_devconf.max_addresses,
6204 .maxlen = sizeof(int),
6205 .mode = 0644,
6206 .proc_handler = proc_dointvec,
6207 },
6208 {
6209 .procname = "accept_ra_defrtr",
6210 .data = &ipv6_devconf.accept_ra_defrtr,
6211 .maxlen = sizeof(int),
6212 .mode = 0644,
6213 .proc_handler = proc_dointvec,
6214 },
6215 {
6216 .procname = "accept_ra_min_hop_limit",
6217 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6218 .maxlen = sizeof(int),
6219 .mode = 0644,
6220 .proc_handler = proc_dointvec,
6221 },
6222 {
6223 .procname = "accept_ra_pinfo",
6224 .data = &ipv6_devconf.accept_ra_pinfo,
6225 .maxlen = sizeof(int),
6226 .mode = 0644,
6227 .proc_handler = proc_dointvec,
6228 },
6229 #ifdef CONFIG_IPV6_ROUTER_PREF
6230 {
6231 .procname = "accept_ra_rtr_pref",
6232 .data = &ipv6_devconf.accept_ra_rtr_pref,
6233 .maxlen = sizeof(int),
6234 .mode = 0644,
6235 .proc_handler = proc_dointvec,
6236 },
6237 {
6238 .procname = "router_probe_interval",
6239 .data = &ipv6_devconf.rtr_probe_interval,
6240 .maxlen = sizeof(int),
6241 .mode = 0644,
6242 .proc_handler = proc_dointvec_jiffies,
6243 },
6244 #ifdef CONFIG_IPV6_ROUTE_INFO
6245 {
6246 .procname = "accept_ra_rt_info_min_plen",
6247 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6248 .maxlen = sizeof(int),
6249 .mode = 0644,
6250 .proc_handler = proc_dointvec,
6251 },
6252 {
6253 .procname = "accept_ra_rt_info_max_plen",
6254 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6255 .maxlen = sizeof(int),
6256 .mode = 0644,
6257 .proc_handler = proc_dointvec,
6258 },
6259 #endif
6260 #endif
6261 {
6262 .procname = "proxy_ndp",
6263 .data = &ipv6_devconf.proxy_ndp,
6264 .maxlen = sizeof(int),
6265 .mode = 0644,
6266 .proc_handler = addrconf_sysctl_proxy_ndp,
6267 },
6268 {
6269 .procname = "accept_source_route",
6270 .data = &ipv6_devconf.accept_source_route,
6271 .maxlen = sizeof(int),
6272 .mode = 0644,
6273 .proc_handler = proc_dointvec,
6274 },
6275 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6276 {
6277 .procname = "optimistic_dad",
6278 .data = &ipv6_devconf.optimistic_dad,
6279 .maxlen = sizeof(int),
6280 .mode = 0644,
6281 .proc_handler = proc_dointvec,
6282 },
6283 {
6284 .procname = "use_optimistic",
6285 .data = &ipv6_devconf.use_optimistic,
6286 .maxlen = sizeof(int),
6287 .mode = 0644,
6288 .proc_handler = proc_dointvec,
6289 },
6290 #endif
6291 #ifdef CONFIG_IPV6_MROUTE
6292 {
6293 .procname = "mc_forwarding",
6294 .data = &ipv6_devconf.mc_forwarding,
6295 .maxlen = sizeof(int),
6296 .mode = 0444,
6297 .proc_handler = proc_dointvec,
6298 },
6299 #endif
6300 {
6301 .procname = "disable_ipv6",
6302 .data = &ipv6_devconf.disable_ipv6,
6303 .maxlen = sizeof(int),
6304 .mode = 0644,
6305 .proc_handler = addrconf_sysctl_disable,
6306 },
6307 {
6308 .procname = "accept_dad",
6309 .data = &ipv6_devconf.accept_dad,
6310 .maxlen = sizeof(int),
6311 .mode = 0644,
6312 .proc_handler = proc_dointvec,
6313 },
6314 {
6315 .procname = "force_tllao",
6316 .data = &ipv6_devconf.force_tllao,
6317 .maxlen = sizeof(int),
6318 .mode = 0644,
6319 .proc_handler = proc_dointvec
6320 },
6321 {
6322 .procname = "ndisc_notify",
6323 .data = &ipv6_devconf.ndisc_notify,
6324 .maxlen = sizeof(int),
6325 .mode = 0644,
6326 .proc_handler = proc_dointvec
6327 },
6328 {
6329 .procname = "suppress_frag_ndisc",
6330 .data = &ipv6_devconf.suppress_frag_ndisc,
6331 .maxlen = sizeof(int),
6332 .mode = 0644,
6333 .proc_handler = proc_dointvec
6334 },
6335 {
6336 .procname = "accept_ra_from_local",
6337 .data = &ipv6_devconf.accept_ra_from_local,
6338 .maxlen = sizeof(int),
6339 .mode = 0644,
6340 .proc_handler = proc_dointvec,
6341 },
6342 {
6343 .procname = "accept_ra_mtu",
6344 .data = &ipv6_devconf.accept_ra_mtu,
6345 .maxlen = sizeof(int),
6346 .mode = 0644,
6347 .proc_handler = proc_dointvec,
6348 },
6349 {
6350 .procname = "stable_secret",
6351 .data = &ipv6_devconf.stable_secret,
6352 .maxlen = IPV6_MAX_STRLEN,
6353 .mode = 0600,
6354 .proc_handler = addrconf_sysctl_stable_secret,
6355 },
6356 {
6357 .procname = "use_oif_addrs_only",
6358 .data = &ipv6_devconf.use_oif_addrs_only,
6359 .maxlen = sizeof(int),
6360 .mode = 0644,
6361 .proc_handler = proc_dointvec,
6362 },
6363 {
6364 .procname = "ignore_routes_with_linkdown",
6365 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6366 .maxlen = sizeof(int),
6367 .mode = 0644,
6368 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6369 },
6370 {
6371 .procname = "drop_unicast_in_l2_multicast",
6372 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6373 .maxlen = sizeof(int),
6374 .mode = 0644,
6375 .proc_handler = proc_dointvec,
6376 },
6377 {
6378 .procname = "drop_unsolicited_na",
6379 .data = &ipv6_devconf.drop_unsolicited_na,
6380 .maxlen = sizeof(int),
6381 .mode = 0644,
6382 .proc_handler = proc_dointvec,
6383 },
6384 {
6385 .procname = "keep_addr_on_down",
6386 .data = &ipv6_devconf.keep_addr_on_down,
6387 .maxlen = sizeof(int),
6388 .mode = 0644,
6389 .proc_handler = proc_dointvec,
6390
6391 },
6392 {
6393 .procname = "seg6_enabled",
6394 .data = &ipv6_devconf.seg6_enabled,
6395 .maxlen = sizeof(int),
6396 .mode = 0644,
6397 .proc_handler = proc_dointvec,
6398 },
6399 #ifdef CONFIG_IPV6_SEG6_HMAC
6400 {
6401 .procname = "seg6_require_hmac",
6402 .data = &ipv6_devconf.seg6_require_hmac,
6403 .maxlen = sizeof(int),
6404 .mode = 0644,
6405 .proc_handler = proc_dointvec,
6406 },
6407 #endif
6408 {
6409 .procname = "enhanced_dad",
6410 .data = &ipv6_devconf.enhanced_dad,
6411 .maxlen = sizeof(int),
6412 .mode = 0644,
6413 .proc_handler = proc_dointvec,
6414 },
6415 {
6416 .procname = "addr_gen_mode",
6417 .data = &ipv6_devconf.addr_gen_mode,
6418 .maxlen = sizeof(int),
6419 .mode = 0644,
6420 .proc_handler = addrconf_sysctl_addr_gen_mode,
6421 },
6422 {
6423 .procname = "disable_policy",
6424 .data = &ipv6_devconf.disable_policy,
6425 .maxlen = sizeof(int),
6426 .mode = 0644,
6427 .proc_handler = addrconf_sysctl_disable_policy,
6428 },
6429 {
6430 .procname = "ndisc_tclass",
6431 .data = &ipv6_devconf.ndisc_tclass,
6432 .maxlen = sizeof(int),
6433 .mode = 0644,
6434 .proc_handler = proc_dointvec_minmax,
6435 .extra1 = (void *)&zero,
6436 .extra2 = (void *)&two_five_five,
6437 },
6438 {
6439 /* sentinel */
6440 }
6441 };
6442
6443 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6444 struct inet6_dev *idev, struct ipv6_devconf *p)
6445 {
6446 int i, ifindex;
6447 struct ctl_table *table;
6448 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6449
6450 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6451 if (!table)
6452 goto out;
6453
6454 for (i = 0; table[i].data; i++) {
6455 table[i].data += (char *)p - (char *)&ipv6_devconf;
6456 /* If one of these is already set, then it is not safe to
6457 * overwrite either of them: this makes proc_dointvec_minmax
6458 * usable.
6459 */
6460 if (!table[i].extra1 && !table[i].extra2) {
6461 table[i].extra1 = idev; /* embedded; no ref */
6462 table[i].extra2 = net;
6463 }
6464 }
6465
6466 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6467
6468 p->sysctl_header = register_net_sysctl(net, path, table);
6469 if (!p->sysctl_header)
6470 goto free;
6471
6472 if (!strcmp(dev_name, "all"))
6473 ifindex = NETCONFA_IFINDEX_ALL;
6474 else if (!strcmp(dev_name, "default"))
6475 ifindex = NETCONFA_IFINDEX_DEFAULT;
6476 else
6477 ifindex = idev->dev->ifindex;
6478 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6479 ifindex, p);
6480 return 0;
6481
6482 free:
6483 kfree(table);
6484 out:
6485 return -ENOBUFS;
6486 }
6487
6488 static void __addrconf_sysctl_unregister(struct net *net,
6489 struct ipv6_devconf *p, int ifindex)
6490 {
6491 struct ctl_table *table;
6492
6493 if (!p->sysctl_header)
6494 return;
6495
6496 table = p->sysctl_header->ctl_table_arg;
6497 unregister_net_sysctl_table(p->sysctl_header);
6498 p->sysctl_header = NULL;
6499 kfree(table);
6500
6501 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6502 }
6503
6504 static int addrconf_sysctl_register(struct inet6_dev *idev)
6505 {
6506 int err;
6507
6508 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6509 return -EINVAL;
6510
6511 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6512 &ndisc_ifinfo_sysctl_change);
6513 if (err)
6514 return err;
6515 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6516 idev, &idev->cnf);
6517 if (err)
6518 neigh_sysctl_unregister(idev->nd_parms);
6519
6520 return err;
6521 }
6522
6523 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6524 {
6525 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6526 idev->dev->ifindex);
6527 neigh_sysctl_unregister(idev->nd_parms);
6528 }
6529
6530
6531 #endif
6532
6533 static int __net_init addrconf_init_net(struct net *net)
6534 {
6535 int err = -ENOMEM;
6536 struct ipv6_devconf *all, *dflt;
6537
6538 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6539 if (!all)
6540 goto err_alloc_all;
6541
6542 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6543 if (!dflt)
6544 goto err_alloc_dflt;
6545
6546 /* these will be inherited by all namespaces */
6547 dflt->autoconf = ipv6_defaults.autoconf;
6548 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6549
6550 dflt->stable_secret.initialized = false;
6551 all->stable_secret.initialized = false;
6552
6553 net->ipv6.devconf_all = all;
6554 net->ipv6.devconf_dflt = dflt;
6555
6556 #ifdef CONFIG_SYSCTL
6557 err = __addrconf_sysctl_register(net, "all", NULL, all);
6558 if (err < 0)
6559 goto err_reg_all;
6560
6561 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6562 if (err < 0)
6563 goto err_reg_dflt;
6564 #endif
6565 return 0;
6566
6567 #ifdef CONFIG_SYSCTL
6568 err_reg_dflt:
6569 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6570 err_reg_all:
6571 kfree(dflt);
6572 #endif
6573 err_alloc_dflt:
6574 kfree(all);
6575 err_alloc_all:
6576 return err;
6577 }
6578
6579 static void __net_exit addrconf_exit_net(struct net *net)
6580 {
6581 #ifdef CONFIG_SYSCTL
6582 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6583 NETCONFA_IFINDEX_DEFAULT);
6584 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6585 NETCONFA_IFINDEX_ALL);
6586 #endif
6587 kfree(net->ipv6.devconf_dflt);
6588 kfree(net->ipv6.devconf_all);
6589 }
6590
6591 static struct pernet_operations addrconf_ops = {
6592 .init = addrconf_init_net,
6593 .exit = addrconf_exit_net,
6594 };
6595
6596 static struct rtnl_af_ops inet6_ops __read_mostly = {
6597 .family = AF_INET6,
6598 .fill_link_af = inet6_fill_link_af,
6599 .get_link_af_size = inet6_get_link_af_size,
6600 .validate_link_af = inet6_validate_link_af,
6601 .set_link_af = inet6_set_link_af,
6602 };
6603
6604 /*
6605 * Init / cleanup code
6606 */
6607
6608 int __init addrconf_init(void)
6609 {
6610 struct inet6_dev *idev;
6611 int i, err;
6612
6613 err = ipv6_addr_label_init();
6614 if (err < 0) {
6615 pr_crit("%s: cannot initialize default policy table: %d\n",
6616 __func__, err);
6617 goto out;
6618 }
6619
6620 err = register_pernet_subsys(&addrconf_ops);
6621 if (err < 0)
6622 goto out_addrlabel;
6623
6624 addrconf_wq = create_workqueue("ipv6_addrconf");
6625 if (!addrconf_wq) {
6626 err = -ENOMEM;
6627 goto out_nowq;
6628 }
6629
6630 /* The addrconf netdev notifier requires that loopback_dev
6631 * has it's ipv6 private information allocated and setup
6632 * before it can bring up and give link-local addresses
6633 * to other devices which are up.
6634 *
6635 * Unfortunately, loopback_dev is not necessarily the first
6636 * entry in the global dev_base list of net devices. In fact,
6637 * it is likely to be the very last entry on that list.
6638 * So this causes the notifier registry below to try and
6639 * give link-local addresses to all devices besides loopback_dev
6640 * first, then loopback_dev, which cases all the non-loopback_dev
6641 * devices to fail to get a link-local address.
6642 *
6643 * So, as a temporary fix, allocate the ipv6 structure for
6644 * loopback_dev first by hand.
6645 * Longer term, all of the dependencies ipv6 has upon the loopback
6646 * device and it being up should be removed.
6647 */
6648 rtnl_lock();
6649 idev = ipv6_add_dev(init_net.loopback_dev);
6650 rtnl_unlock();
6651 if (IS_ERR(idev)) {
6652 err = PTR_ERR(idev);
6653 goto errlo;
6654 }
6655
6656 ip6_route_init_special_entries();
6657
6658 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6659 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6660
6661 register_netdevice_notifier(&ipv6_dev_notf);
6662
6663 addrconf_verify();
6664
6665 rtnl_af_register(&inet6_ops);
6666
6667 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
6668 NULL, inet6_dump_ifinfo, 0);
6669 if (err < 0)
6670 goto errout;
6671
6672 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
6673 inet6_rtm_newaddr, NULL, 0);
6674 if (err < 0)
6675 goto errout;
6676 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
6677 inet6_rtm_deladdr, NULL, 0);
6678 if (err < 0)
6679 goto errout;
6680 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
6681 inet6_rtm_getaddr, inet6_dump_ifaddr,
6682 RTNL_FLAG_DOIT_UNLOCKED);
6683 if (err < 0)
6684 goto errout;
6685 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
6686 NULL, inet6_dump_ifmcaddr, 0);
6687 if (err < 0)
6688 goto errout;
6689 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
6690 NULL, inet6_dump_ifacaddr, 0);
6691 if (err < 0)
6692 goto errout;
6693 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
6694 inet6_netconf_get_devconf,
6695 inet6_netconf_dump_devconf,
6696 RTNL_FLAG_DOIT_UNLOCKED);
6697 if (err < 0)
6698 goto errout;
6699 err = ipv6_addr_label_rtnl_register();
6700 if (err < 0)
6701 goto errout;
6702
6703 return 0;
6704 errout:
6705 rtnl_unregister_all(PF_INET6);
6706 rtnl_af_unregister(&inet6_ops);
6707 unregister_netdevice_notifier(&ipv6_dev_notf);
6708 errlo:
6709 destroy_workqueue(addrconf_wq);
6710 out_nowq:
6711 unregister_pernet_subsys(&addrconf_ops);
6712 out_addrlabel:
6713 ipv6_addr_label_cleanup();
6714 out:
6715 return err;
6716 }
6717
6718 void addrconf_cleanup(void)
6719 {
6720 struct net_device *dev;
6721 int i;
6722
6723 unregister_netdevice_notifier(&ipv6_dev_notf);
6724 unregister_pernet_subsys(&addrconf_ops);
6725 ipv6_addr_label_cleanup();
6726
6727 rtnl_af_unregister(&inet6_ops);
6728
6729 rtnl_lock();
6730
6731 /* clean dev list */
6732 for_each_netdev(&init_net, dev) {
6733 if (__in6_dev_get(dev) == NULL)
6734 continue;
6735 addrconf_ifdown(dev, 1);
6736 }
6737 addrconf_ifdown(init_net.loopback_dev, 2);
6738
6739 /*
6740 * Check hash table.
6741 */
6742 spin_lock_bh(&addrconf_hash_lock);
6743 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6744 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6745 spin_unlock_bh(&addrconf_hash_lock);
6746 cancel_delayed_work(&addr_chk_work);
6747 rtnl_unlock();
6748
6749 destroy_workqueue(addrconf_wq);
6750 }
Linux with added FPC-III support