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Merge tag 'iommu-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
[linux/fpc-iii.git] / net / ipv6 / addrconf.c
blobeff2cacd52093962d17bb9798b21ed20d7b1a995
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 */
10
11 /*
12 * Changes:
13 *
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
17 * unload.
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
20 * packets.
21 * yoshfuji@USAGI : Fixed interval between DAD
22 * packets.
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
26 * support.
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
31 * seq_file.
32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
34 * status etc.
35 */
36
37 #define pr_fmt(fmt) "IPv6: " fmt
38
39 #include <linux/errno.h>
40 #include <linux/types.h>
41 #include <linux/kernel.h>
42 #include <linux/sched/signal.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/inet.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64 #include <linux/hash.h>
65
66 #include <net/net_namespace.h>
67 #include <net/sock.h>
68 #include <net/snmp.h>
69
70 #include <net/6lowpan.h>
71 #include <net/firewire.h>
72 #include <net/ipv6.h>
73 #include <net/protocol.h>
74 #include <net/ndisc.h>
75 #include <net/ip6_route.h>
76 #include <net/addrconf.h>
77 #include <net/tcp.h>
78 #include <net/ip.h>
79 #include <net/netlink.h>
80 #include <net/pkt_sched.h>
81 #include <net/l3mdev.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
85 #include <linux/random.h>
86 #include <linux/uaccess.h>
87 #include <asm/unaligned.h>
88
89 #include <linux/proc_fs.h>
90 #include <linux/seq_file.h>
91 #include <linux/export.h>
92
93 #define INFINITY_LIFE_TIME 0xFFFFFFFF
94
95 #define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
98 static inline u32 cstamp_delta(unsigned long cstamp)
99 {
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101 }
102
103 static inline s32 rfc3315_s14_backoff_init(s32 irt)
104 {
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109 }
110
111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112 {
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122 }
123
124 #ifdef CONFIG_SYSCTL
125 static int addrconf_sysctl_register(struct inet6_dev *idev);
126 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127 #else
128 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
129 {
130 return 0;
131 }
132
133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134 {
135 }
136 #endif
137
138 static void ipv6_gen_rnd_iid(struct in6_addr *addr);
139
140 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
141 static int ipv6_count_addresses(const struct inet6_dev *idev);
142 static int ipv6_generate_stable_address(struct in6_addr *addr,
143 u8 dad_count,
144 const struct inet6_dev *idev);
145
146 #define IN6_ADDR_HSIZE_SHIFT 8
147 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
148 /*
149 * Configured unicast address hash table
150 */
151 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
152 static DEFINE_SPINLOCK(addrconf_hash_lock);
153
154 static void addrconf_verify(void);
155 static void addrconf_verify_rtnl(void);
156 static void addrconf_verify_work(struct work_struct *);
157
158 static struct workqueue_struct *addrconf_wq;
159 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
160
161 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
162 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
163
164 static void addrconf_type_change(struct net_device *dev,
165 unsigned long event);
166 static int addrconf_ifdown(struct net_device *dev, bool unregister);
167
168 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
169 int plen,
170 const struct net_device *dev,
171 u32 flags, u32 noflags,
172 bool no_gw);
173
174 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
175 static void addrconf_dad_work(struct work_struct *w);
176 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
177 bool send_na);
178 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
179 static void addrconf_rs_timer(struct timer_list *t);
180 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
181 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182
183 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
184 struct prefix_info *pinfo);
185
186 static struct ipv6_devconf ipv6_devconf __read_mostly = {
187 .forwarding = 0,
188 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
189 .mtu6 = IPV6_MIN_MTU,
190 .accept_ra = 1,
191 .accept_redirects = 1,
192 .autoconf = 1,
193 .force_mld_version = 0,
194 .mldv1_unsolicited_report_interval = 10 * HZ,
195 .mldv2_unsolicited_report_interval = HZ,
196 .dad_transmits = 1,
197 .rtr_solicits = MAX_RTR_SOLICITATIONS,
198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
199 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201 .use_tempaddr = 0,
202 .temp_valid_lft = TEMP_VALID_LIFETIME,
203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
204 .regen_max_retry = REGEN_MAX_RETRY,
205 .max_desync_factor = MAX_DESYNC_FACTOR,
206 .max_addresses = IPV6_MAX_ADDRESSES,
207 .accept_ra_defrtr = 1,
208 .accept_ra_from_local = 0,
209 .accept_ra_min_hop_limit= 1,
210 .accept_ra_pinfo = 1,
211 #ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
213 .rtr_probe_interval = 60 * HZ,
214 #ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_min_plen = 0,
216 .accept_ra_rt_info_max_plen = 0,
217 #endif
218 #endif
219 .proxy_ndp = 0,
220 .accept_source_route = 0, /* we do not accept RH0 by default. */
221 .disable_ipv6 = 0,
222 .accept_dad = 0,
223 .suppress_frag_ndisc = 1,
224 .accept_ra_mtu = 1,
225 .stable_secret = {
226 .initialized = false,
227 },
228 .use_oif_addrs_only = 0,
229 .ignore_routes_with_linkdown = 0,
230 .keep_addr_on_down = 0,
231 .seg6_enabled = 0,
232 #ifdef CONFIG_IPV6_SEG6_HMAC
233 .seg6_require_hmac = 0,
234 #endif
235 .enhanced_dad = 1,
236 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
237 .disable_policy = 0,
238 .rpl_seg_enabled = 0,
239 };
240
241 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
242 .forwarding = 0,
243 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
244 .mtu6 = IPV6_MIN_MTU,
245 .accept_ra = 1,
246 .accept_redirects = 1,
247 .autoconf = 1,
248 .force_mld_version = 0,
249 .mldv1_unsolicited_report_interval = 10 * HZ,
250 .mldv2_unsolicited_report_interval = HZ,
251 .dad_transmits = 1,
252 .rtr_solicits = MAX_RTR_SOLICITATIONS,
253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
256 .use_tempaddr = 0,
257 .temp_valid_lft = TEMP_VALID_LIFETIME,
258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
259 .regen_max_retry = REGEN_MAX_RETRY,
260 .max_desync_factor = MAX_DESYNC_FACTOR,
261 .max_addresses = IPV6_MAX_ADDRESSES,
262 .accept_ra_defrtr = 1,
263 .accept_ra_from_local = 0,
264 .accept_ra_min_hop_limit= 1,
265 .accept_ra_pinfo = 1,
266 #ifdef CONFIG_IPV6_ROUTER_PREF
267 .accept_ra_rtr_pref = 1,
268 .rtr_probe_interval = 60 * HZ,
269 #ifdef CONFIG_IPV6_ROUTE_INFO
270 .accept_ra_rt_info_min_plen = 0,
271 .accept_ra_rt_info_max_plen = 0,
272 #endif
273 #endif
274 .proxy_ndp = 0,
275 .accept_source_route = 0, /* we do not accept RH0 by default. */
276 .disable_ipv6 = 0,
277 .accept_dad = 1,
278 .suppress_frag_ndisc = 1,
279 .accept_ra_mtu = 1,
280 .stable_secret = {
281 .initialized = false,
282 },
283 .use_oif_addrs_only = 0,
284 .ignore_routes_with_linkdown = 0,
285 .keep_addr_on_down = 0,
286 .seg6_enabled = 0,
287 #ifdef CONFIG_IPV6_SEG6_HMAC
288 .seg6_require_hmac = 0,
289 #endif
290 .enhanced_dad = 1,
291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
292 .disable_policy = 0,
293 .rpl_seg_enabled = 0,
294 };
295
296 /* Check if link is ready: is it up and is a valid qdisc available */
297 static inline bool addrconf_link_ready(const struct net_device *dev)
298 {
299 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
300 }
301
302 static void addrconf_del_rs_timer(struct inet6_dev *idev)
303 {
304 if (del_timer(&idev->rs_timer))
305 __in6_dev_put(idev);
306 }
307
308 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
309 {
310 if (cancel_delayed_work(&ifp->dad_work))
311 __in6_ifa_put(ifp);
312 }
313
314 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
315 unsigned long when)
316 {
317 if (!timer_pending(&idev->rs_timer))
318 in6_dev_hold(idev);
319 mod_timer(&idev->rs_timer, jiffies + when);
320 }
321
322 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
323 unsigned long delay)
324 {
325 in6_ifa_hold(ifp);
326 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
327 in6_ifa_put(ifp);
328 }
329
330 static int snmp6_alloc_dev(struct inet6_dev *idev)
331 {
332 int i;
333
334 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
335 if (!idev->stats.ipv6)
336 goto err_ip;
337
338 for_each_possible_cpu(i) {
339 struct ipstats_mib *addrconf_stats;
340 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
341 u64_stats_init(&addrconf_stats->syncp);
342 }
343
344
345 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
346 GFP_KERNEL);
347 if (!idev->stats.icmpv6dev)
348 goto err_icmp;
349 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
350 GFP_KERNEL);
351 if (!idev->stats.icmpv6msgdev)
352 goto err_icmpmsg;
353
354 return 0;
355
356 err_icmpmsg:
357 kfree(idev->stats.icmpv6dev);
358 err_icmp:
359 free_percpu(idev->stats.ipv6);
360 err_ip:
361 return -ENOMEM;
362 }
363
364 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
365 {
366 struct inet6_dev *ndev;
367 int err = -ENOMEM;
368
369 ASSERT_RTNL();
370
371 if (dev->mtu < IPV6_MIN_MTU)
372 return ERR_PTR(-EINVAL);
373
374 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
375 if (!ndev)
376 return ERR_PTR(err);
377
378 rwlock_init(&ndev->lock);
379 ndev->dev = dev;
380 INIT_LIST_HEAD(&ndev->addr_list);
381 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
382 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
383
384 if (ndev->cnf.stable_secret.initialized)
385 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
386
387 ndev->cnf.mtu6 = dev->mtu;
388 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
389 if (!ndev->nd_parms) {
390 kfree(ndev);
391 return ERR_PTR(err);
392 }
393 if (ndev->cnf.forwarding)
394 dev_disable_lro(dev);
395 /* We refer to the device */
396 dev_hold(dev);
397
398 if (snmp6_alloc_dev(ndev) < 0) {
399 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
400 __func__);
401 neigh_parms_release(&nd_tbl, ndev->nd_parms);
402 dev_put(dev);
403 kfree(ndev);
404 return ERR_PTR(err);
405 }
406
407 if (snmp6_register_dev(ndev) < 0) {
408 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
409 __func__, dev->name);
410 goto err_release;
411 }
412
413 /* One reference from device. */
414 refcount_set(&ndev->refcnt, 1);
415
416 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
417 ndev->cnf.accept_dad = -1;
418
419 #if IS_ENABLED(CONFIG_IPV6_SIT)
420 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
421 pr_info("%s: Disabled Multicast RS\n", dev->name);
422 ndev->cnf.rtr_solicits = 0;
423 }
424 #endif
425
426 INIT_LIST_HEAD(&ndev->tempaddr_list);
427 ndev->desync_factor = U32_MAX;
428 if ((dev->flags&IFF_LOOPBACK) ||
429 dev->type == ARPHRD_TUNNEL ||
430 dev->type == ARPHRD_TUNNEL6 ||
431 dev->type == ARPHRD_SIT ||
432 dev->type == ARPHRD_NONE) {
433 ndev->cnf.use_tempaddr = -1;
434 }
435
436 ndev->token = in6addr_any;
437
438 if (netif_running(dev) && addrconf_link_ready(dev))
439 ndev->if_flags |= IF_READY;
440
441 ipv6_mc_init_dev(ndev);
442 ndev->tstamp = jiffies;
443 err = addrconf_sysctl_register(ndev);
444 if (err) {
445 ipv6_mc_destroy_dev(ndev);
446 snmp6_unregister_dev(ndev);
447 goto err_release;
448 }
449 /* protected by rtnl_lock */
450 rcu_assign_pointer(dev->ip6_ptr, ndev);
451
452 /* Join interface-local all-node multicast group */
453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
454
455 /* Join all-node multicast group */
456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
457
458 /* Join all-router multicast group if forwarding is set */
459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
461
462 return ndev;
463
464 err_release:
465 neigh_parms_release(&nd_tbl, ndev->nd_parms);
466 ndev->dead = 1;
467 in6_dev_finish_destroy(ndev);
468 return ERR_PTR(err);
469 }
470
471 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
472 {
473 struct inet6_dev *idev;
474
475 ASSERT_RTNL();
476
477 idev = __in6_dev_get(dev);
478 if (!idev) {
479 idev = ipv6_add_dev(dev);
480 if (IS_ERR(idev))
481 return idev;
482 }
483
484 if (dev->flags&IFF_UP)
485 ipv6_mc_up(idev);
486 return idev;
487 }
488
489 static int inet6_netconf_msgsize_devconf(int type)
490 {
491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
492 + nla_total_size(4); /* NETCONFA_IFINDEX */
493 bool all = false;
494
495 if (type == NETCONFA_ALL)
496 all = true;
497
498 if (all || type == NETCONFA_FORWARDING)
499 size += nla_total_size(4);
500 #ifdef CONFIG_IPV6_MROUTE
501 if (all || type == NETCONFA_MC_FORWARDING)
502 size += nla_total_size(4);
503 #endif
504 if (all || type == NETCONFA_PROXY_NEIGH)
505 size += nla_total_size(4);
506
507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
508 size += nla_total_size(4);
509
510 return size;
511 }
512
513 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
514 struct ipv6_devconf *devconf, u32 portid,
515 u32 seq, int event, unsigned int flags,
516 int type)
517 {
518 struct nlmsghdr *nlh;
519 struct netconfmsg *ncm;
520 bool all = false;
521
522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
523 flags);
524 if (!nlh)
525 return -EMSGSIZE;
526
527 if (type == NETCONFA_ALL)
528 all = true;
529
530 ncm = nlmsg_data(nlh);
531 ncm->ncm_family = AF_INET6;
532
533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
534 goto nla_put_failure;
535
536 if (!devconf)
537 goto out;
538
539 if ((all || type == NETCONFA_FORWARDING) &&
540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
541 goto nla_put_failure;
542 #ifdef CONFIG_IPV6_MROUTE
543 if ((all || type == NETCONFA_MC_FORWARDING) &&
544 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
545 devconf->mc_forwarding) < 0)
546 goto nla_put_failure;
547 #endif
548 if ((all || type == NETCONFA_PROXY_NEIGH) &&
549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
550 goto nla_put_failure;
551
552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
554 devconf->ignore_routes_with_linkdown) < 0)
555 goto nla_put_failure;
556
557 out:
558 nlmsg_end(skb, nlh);
559 return 0;
560
561 nla_put_failure:
562 nlmsg_cancel(skb, nlh);
563 return -EMSGSIZE;
564 }
565
566 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
567 int ifindex, struct ipv6_devconf *devconf)
568 {
569 struct sk_buff *skb;
570 int err = -ENOBUFS;
571
572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
573 if (!skb)
574 goto errout;
575
576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
577 event, 0, type);
578 if (err < 0) {
579 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
580 WARN_ON(err == -EMSGSIZE);
581 kfree_skb(skb);
582 goto errout;
583 }
584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
585 return;
586 errout:
587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
588 }
589
590 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
591 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
592 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
595 };
596
597 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
598 const struct nlmsghdr *nlh,
599 struct nlattr **tb,
600 struct netlink_ext_ack *extack)
601 {
602 int i, err;
603
604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
606 return -EINVAL;
607 }
608
609 if (!netlink_strict_get_check(skb))
610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
611 tb, NETCONFA_MAX,
612 devconf_ipv6_policy, extack);
613
614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
615 tb, NETCONFA_MAX,
616 devconf_ipv6_policy, extack);
617 if (err)
618 return err;
619
620 for (i = 0; i <= NETCONFA_MAX; i++) {
621 if (!tb[i])
622 continue;
623
624 switch (i) {
625 case NETCONFA_IFINDEX:
626 break;
627 default:
628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
629 return -EINVAL;
630 }
631 }
632
633 return 0;
634 }
635
636 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
637 struct nlmsghdr *nlh,
638 struct netlink_ext_ack *extack)
639 {
640 struct net *net = sock_net(in_skb->sk);
641 struct nlattr *tb[NETCONFA_MAX+1];
642 struct inet6_dev *in6_dev = NULL;
643 struct net_device *dev = NULL;
644 struct sk_buff *skb;
645 struct ipv6_devconf *devconf;
646 int ifindex;
647 int err;
648
649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
650 if (err < 0)
651 return err;
652
653 if (!tb[NETCONFA_IFINDEX])
654 return -EINVAL;
655
656 err = -EINVAL;
657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
658 switch (ifindex) {
659 case NETCONFA_IFINDEX_ALL:
660 devconf = net->ipv6.devconf_all;
661 break;
662 case NETCONFA_IFINDEX_DEFAULT:
663 devconf = net->ipv6.devconf_dflt;
664 break;
665 default:
666 dev = dev_get_by_index(net, ifindex);
667 if (!dev)
668 return -EINVAL;
669 in6_dev = in6_dev_get(dev);
670 if (!in6_dev)
671 goto errout;
672 devconf = &in6_dev->cnf;
673 break;
674 }
675
676 err = -ENOBUFS;
677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
678 if (!skb)
679 goto errout;
680
681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
682 NETLINK_CB(in_skb).portid,
683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
684 NETCONFA_ALL);
685 if (err < 0) {
686 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
687 WARN_ON(err == -EMSGSIZE);
688 kfree_skb(skb);
689 goto errout;
690 }
691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
692 errout:
693 if (in6_dev)
694 in6_dev_put(in6_dev);
695 if (dev)
696 dev_put(dev);
697 return err;
698 }
699
700 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
701 struct netlink_callback *cb)
702 {
703 const struct nlmsghdr *nlh = cb->nlh;
704 struct net *net = sock_net(skb->sk);
705 int h, s_h;
706 int idx, s_idx;
707 struct net_device *dev;
708 struct inet6_dev *idev;
709 struct hlist_head *head;
710
711 if (cb->strict_check) {
712 struct netlink_ext_ack *extack = cb->extack;
713 struct netconfmsg *ncm;
714
715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
717 return -EINVAL;
718 }
719
720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
722 return -EINVAL;
723 }
724 }
725
726 s_h = cb->args[0];
727 s_idx = idx = cb->args[1];
728
729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
730 idx = 0;
731 head = &net->dev_index_head[h];
732 rcu_read_lock();
733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
734 net->dev_base_seq;
735 hlist_for_each_entry_rcu(dev, head, index_hlist) {
736 if (idx < s_idx)
737 goto cont;
738 idev = __in6_dev_get(dev);
739 if (!idev)
740 goto cont;
741
742 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
743 &idev->cnf,
744 NETLINK_CB(cb->skb).portid,
745 nlh->nlmsg_seq,
746 RTM_NEWNETCONF,
747 NLM_F_MULTI,
748 NETCONFA_ALL) < 0) {
749 rcu_read_unlock();
750 goto done;
751 }
752 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
753 cont:
754 idx++;
755 }
756 rcu_read_unlock();
757 }
758 if (h == NETDEV_HASHENTRIES) {
759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
760 net->ipv6.devconf_all,
761 NETLINK_CB(cb->skb).portid,
762 nlh->nlmsg_seq,
763 RTM_NEWNETCONF, NLM_F_MULTI,
764 NETCONFA_ALL) < 0)
765 goto done;
766 else
767 h++;
768 }
769 if (h == NETDEV_HASHENTRIES + 1) {
770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
771 net->ipv6.devconf_dflt,
772 NETLINK_CB(cb->skb).portid,
773 nlh->nlmsg_seq,
774 RTM_NEWNETCONF, NLM_F_MULTI,
775 NETCONFA_ALL) < 0)
776 goto done;
777 else
778 h++;
779 }
780 done:
781 cb->args[0] = h;
782 cb->args[1] = idx;
783
784 return skb->len;
785 }
786
787 #ifdef CONFIG_SYSCTL
788 static void dev_forward_change(struct inet6_dev *idev)
789 {
790 struct net_device *dev;
791 struct inet6_ifaddr *ifa;
792
793 if (!idev)
794 return;
795 dev = idev->dev;
796 if (idev->cnf.forwarding)
797 dev_disable_lro(dev);
798 if (dev->flags & IFF_MULTICAST) {
799 if (idev->cnf.forwarding) {
800 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
801 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
802 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
803 } else {
804 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
805 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
806 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
807 }
808 }
809
810 list_for_each_entry(ifa, &idev->addr_list, if_list) {
811 if (ifa->flags&IFA_F_TENTATIVE)
812 continue;
813 if (idev->cnf.forwarding)
814 addrconf_join_anycast(ifa);
815 else
816 addrconf_leave_anycast(ifa);
817 }
818 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
819 NETCONFA_FORWARDING,
820 dev->ifindex, &idev->cnf);
821 }
822
823
824 static void addrconf_forward_change(struct net *net, __s32 newf)
825 {
826 struct net_device *dev;
827 struct inet6_dev *idev;
828
829 for_each_netdev(net, dev) {
830 idev = __in6_dev_get(dev);
831 if (idev) {
832 int changed = (!idev->cnf.forwarding) ^ (!newf);
833 idev->cnf.forwarding = newf;
834 if (changed)
835 dev_forward_change(idev);
836 }
837 }
838 }
839
840 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
841 {
842 struct net *net;
843 int old;
844
845 if (!rtnl_trylock())
846 return restart_syscall();
847
848 net = (struct net *)table->extra2;
849 old = *p;
850 *p = newf;
851
852 if (p == &net->ipv6.devconf_dflt->forwarding) {
853 if ((!newf) ^ (!old))
854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
855 NETCONFA_FORWARDING,
856 NETCONFA_IFINDEX_DEFAULT,
857 net->ipv6.devconf_dflt);
858 rtnl_unlock();
859 return 0;
860 }
861
862 if (p == &net->ipv6.devconf_all->forwarding) {
863 int old_dflt = net->ipv6.devconf_dflt->forwarding;
864
865 net->ipv6.devconf_dflt->forwarding = newf;
866 if ((!newf) ^ (!old_dflt))
867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
868 NETCONFA_FORWARDING,
869 NETCONFA_IFINDEX_DEFAULT,
870 net->ipv6.devconf_dflt);
871
872 addrconf_forward_change(net, newf);
873 if ((!newf) ^ (!old))
874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
875 NETCONFA_FORWARDING,
876 NETCONFA_IFINDEX_ALL,
877 net->ipv6.devconf_all);
878 } else if ((!newf) ^ (!old))
879 dev_forward_change((struct inet6_dev *)table->extra1);
880 rtnl_unlock();
881
882 if (newf)
883 rt6_purge_dflt_routers(net);
884 return 1;
885 }
886
887 static void addrconf_linkdown_change(struct net *net, __s32 newf)
888 {
889 struct net_device *dev;
890 struct inet6_dev *idev;
891
892 for_each_netdev(net, dev) {
893 idev = __in6_dev_get(dev);
894 if (idev) {
895 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
896
897 idev->cnf.ignore_routes_with_linkdown = newf;
898 if (changed)
899 inet6_netconf_notify_devconf(dev_net(dev),
900 RTM_NEWNETCONF,
901 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
902 dev->ifindex,
903 &idev->cnf);
904 }
905 }
906 }
907
908 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
909 {
910 struct net *net;
911 int old;
912
913 if (!rtnl_trylock())
914 return restart_syscall();
915
916 net = (struct net *)table->extra2;
917 old = *p;
918 *p = newf;
919
920 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
921 if ((!newf) ^ (!old))
922 inet6_netconf_notify_devconf(net,
923 RTM_NEWNETCONF,
924 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
925 NETCONFA_IFINDEX_DEFAULT,
926 net->ipv6.devconf_dflt);
927 rtnl_unlock();
928 return 0;
929 }
930
931 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
932 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
933 addrconf_linkdown_change(net, newf);
934 if ((!newf) ^ (!old))
935 inet6_netconf_notify_devconf(net,
936 RTM_NEWNETCONF,
937 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
938 NETCONFA_IFINDEX_ALL,
939 net->ipv6.devconf_all);
940 }
941 rtnl_unlock();
942
943 return 1;
944 }
945
946 #endif
947
948 /* Nobody refers to this ifaddr, destroy it */
949 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
950 {
951 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
952
953 #ifdef NET_REFCNT_DEBUG
954 pr_debug("%s\n", __func__);
955 #endif
956
957 in6_dev_put(ifp->idev);
958
959 if (cancel_delayed_work(&ifp->dad_work))
960 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
961 ifp);
962
963 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
964 pr_warn("Freeing alive inet6 address %p\n", ifp);
965 return;
966 }
967
968 kfree_rcu(ifp, rcu);
969 }
970
971 static void
972 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
973 {
974 struct list_head *p;
975 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
976
977 /*
978 * Each device address list is sorted in order of scope -
979 * global before linklocal.
980 */
981 list_for_each(p, &idev->addr_list) {
982 struct inet6_ifaddr *ifa
983 = list_entry(p, struct inet6_ifaddr, if_list);
984 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
985 break;
986 }
987
988 list_add_tail_rcu(&ifp->if_list, p);
989 }
990
991 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
992 {
993 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
994
995 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
996 }
997
998 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
999 struct net_device *dev, unsigned int hash)
1000 {
1001 struct inet6_ifaddr *ifp;
1002
1003 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1004 if (!net_eq(dev_net(ifp->idev->dev), net))
1005 continue;
1006 if (ipv6_addr_equal(&ifp->addr, addr)) {
1007 if (!dev || ifp->idev->dev == dev)
1008 return true;
1009 }
1010 }
1011 return false;
1012 }
1013
1014 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1015 {
1016 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1017 int err = 0;
1018
1019 spin_lock(&addrconf_hash_lock);
1020
1021 /* Ignore adding duplicate addresses on an interface */
1022 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1023 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1024 err = -EEXIST;
1025 } else {
1026 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1027 }
1028
1029 spin_unlock(&addrconf_hash_lock);
1030
1031 return err;
1032 }
1033
1034 /* On success it returns ifp with increased reference count */
1035
1036 static struct inet6_ifaddr *
1037 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1038 bool can_block, struct netlink_ext_ack *extack)
1039 {
1040 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1041 int addr_type = ipv6_addr_type(cfg->pfx);
1042 struct net *net = dev_net(idev->dev);
1043 struct inet6_ifaddr *ifa = NULL;
1044 struct fib6_info *f6i = NULL;
1045 int err = 0;
1046
1047 if (addr_type == IPV6_ADDR_ANY ||
1048 (addr_type & IPV6_ADDR_MULTICAST &&
1049 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1050 (!(idev->dev->flags & IFF_LOOPBACK) &&
1051 !netif_is_l3_master(idev->dev) &&
1052 addr_type & IPV6_ADDR_LOOPBACK))
1053 return ERR_PTR(-EADDRNOTAVAIL);
1054
1055 if (idev->dead) {
1056 err = -ENODEV; /*XXX*/
1057 goto out;
1058 }
1059
1060 if (idev->cnf.disable_ipv6) {
1061 err = -EACCES;
1062 goto out;
1063 }
1064
1065 /* validator notifier needs to be blocking;
1066 * do not call in atomic context
1067 */
1068 if (can_block) {
1069 struct in6_validator_info i6vi = {
1070 .i6vi_addr = *cfg->pfx,
1071 .i6vi_dev = idev,
1072 .extack = extack,
1073 };
1074
1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1076 err = notifier_to_errno(err);
1077 if (err < 0)
1078 goto out;
1079 }
1080
1081 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1082 if (!ifa) {
1083 err = -ENOBUFS;
1084 goto out;
1085 }
1086
1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1088 if (IS_ERR(f6i)) {
1089 err = PTR_ERR(f6i);
1090 f6i = NULL;
1091 goto out;
1092 }
1093
1094 if (net->ipv6.devconf_all->disable_policy ||
1095 idev->cnf.disable_policy)
1096 f6i->dst_nopolicy = true;
1097
1098 neigh_parms_data_state_setall(idev->nd_parms);
1099
1100 ifa->addr = *cfg->pfx;
1101 if (cfg->peer_pfx)
1102 ifa->peer_addr = *cfg->peer_pfx;
1103
1104 spin_lock_init(&ifa->lock);
1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1106 INIT_HLIST_NODE(&ifa->addr_lst);
1107 ifa->scope = cfg->scope;
1108 ifa->prefix_len = cfg->plen;
1109 ifa->rt_priority = cfg->rt_priority;
1110 ifa->flags = cfg->ifa_flags;
1111 /* No need to add the TENTATIVE flag for addresses with NODAD */
1112 if (!(cfg->ifa_flags & IFA_F_NODAD))
1113 ifa->flags |= IFA_F_TENTATIVE;
1114 ifa->valid_lft = cfg->valid_lft;
1115 ifa->prefered_lft = cfg->preferred_lft;
1116 ifa->cstamp = ifa->tstamp = jiffies;
1117 ifa->tokenized = false;
1118
1119 ifa->rt = f6i;
1120
1121 ifa->idev = idev;
1122 in6_dev_hold(idev);
1123
1124 /* For caller */
1125 refcount_set(&ifa->refcnt, 1);
1126
1127 rcu_read_lock_bh();
1128
1129 err = ipv6_add_addr_hash(idev->dev, ifa);
1130 if (err < 0) {
1131 rcu_read_unlock_bh();
1132 goto out;
1133 }
1134
1135 write_lock(&idev->lock);
1136
1137 /* Add to inet6_dev unicast addr list. */
1138 ipv6_link_dev_addr(idev, ifa);
1139
1140 if (ifa->flags&IFA_F_TEMPORARY) {
1141 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1142 in6_ifa_hold(ifa);
1143 }
1144
1145 in6_ifa_hold(ifa);
1146 write_unlock(&idev->lock);
1147
1148 rcu_read_unlock_bh();
1149
1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1151 out:
1152 if (unlikely(err < 0)) {
1153 fib6_info_release(f6i);
1154
1155 if (ifa) {
1156 if (ifa->idev)
1157 in6_dev_put(ifa->idev);
1158 kfree(ifa);
1159 }
1160 ifa = ERR_PTR(err);
1161 }
1162
1163 return ifa;
1164 }
1165
1166 enum cleanup_prefix_rt_t {
1167 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1168 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1169 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1170 };
1171
1172 /*
1173 * Check, whether the prefix for ifp would still need a prefix route
1174 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1175 * constants.
1176 *
1177 * 1) we don't purge prefix if address was not permanent.
1178 * prefix is managed by its own lifetime.
1179 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1180 * 3) if there are no addresses, delete prefix.
1181 * 4) if there are still other permanent address(es),
1182 * corresponding prefix is still permanent.
1183 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1184 * don't purge the prefix, assume user space is managing it.
1185 * 6) otherwise, update prefix lifetime to the
1186 * longest valid lifetime among the corresponding
1187 * addresses on the device.
1188 * Note: subsequent RA will update lifetime.
1189 **/
1190 static enum cleanup_prefix_rt_t
1191 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1192 {
1193 struct inet6_ifaddr *ifa;
1194 struct inet6_dev *idev = ifp->idev;
1195 unsigned long lifetime;
1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1197
1198 *expires = jiffies;
1199
1200 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1201 if (ifa == ifp)
1202 continue;
1203 if (ifa->prefix_len != ifp->prefix_len ||
1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1205 ifp->prefix_len))
1206 continue;
1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1208 return CLEANUP_PREFIX_RT_NOP;
1209
1210 action = CLEANUP_PREFIX_RT_EXPIRE;
1211
1212 spin_lock(&ifa->lock);
1213
1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1215 /*
1216 * Note: Because this address is
1217 * not permanent, lifetime <
1218 * LONG_MAX / HZ here.
1219 */
1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1221 *expires = ifa->tstamp + lifetime * HZ;
1222 spin_unlock(&ifa->lock);
1223 }
1224
1225 return action;
1226 }
1227
1228 static void
1229 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1230 bool del_rt, bool del_peer)
1231 {
1232 struct fib6_info *f6i;
1233
1234 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1235 ifp->prefix_len,
1236 ifp->idev->dev, 0, RTF_DEFAULT, true);
1237 if (f6i) {
1238 if (del_rt)
1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1240 else {
1241 if (!(f6i->fib6_flags & RTF_EXPIRES))
1242 fib6_set_expires(f6i, expires);
1243 fib6_info_release(f6i);
1244 }
1245 }
1246 }
1247
1248
1249 /* This function wants to get referenced ifp and releases it before return */
1250
1251 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1252 {
1253 int state;
1254 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1255 unsigned long expires;
1256
1257 ASSERT_RTNL();
1258
1259 spin_lock_bh(&ifp->lock);
1260 state = ifp->state;
1261 ifp->state = INET6_IFADDR_STATE_DEAD;
1262 spin_unlock_bh(&ifp->lock);
1263
1264 if (state == INET6_IFADDR_STATE_DEAD)
1265 goto out;
1266
1267 spin_lock_bh(&addrconf_hash_lock);
1268 hlist_del_init_rcu(&ifp->addr_lst);
1269 spin_unlock_bh(&addrconf_hash_lock);
1270
1271 write_lock_bh(&ifp->idev->lock);
1272
1273 if (ifp->flags&IFA_F_TEMPORARY) {
1274 list_del(&ifp->tmp_list);
1275 if (ifp->ifpub) {
1276 in6_ifa_put(ifp->ifpub);
1277 ifp->ifpub = NULL;
1278 }
1279 __in6_ifa_put(ifp);
1280 }
1281
1282 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1283 action = check_cleanup_prefix_route(ifp, &expires);
1284
1285 list_del_rcu(&ifp->if_list);
1286 __in6_ifa_put(ifp);
1287
1288 write_unlock_bh(&ifp->idev->lock);
1289
1290 addrconf_del_dad_work(ifp);
1291
1292 ipv6_ifa_notify(RTM_DELADDR, ifp);
1293
1294 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1295
1296 if (action != CLEANUP_PREFIX_RT_NOP) {
1297 cleanup_prefix_route(ifp, expires,
1298 action == CLEANUP_PREFIX_RT_DEL, false);
1299 }
1300
1301 /* clean up prefsrc entries */
1302 rt6_remove_prefsrc(ifp);
1303 out:
1304 in6_ifa_put(ifp);
1305 }
1306
1307 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1308 {
1309 struct inet6_dev *idev = ifp->idev;
1310 unsigned long tmp_tstamp, age;
1311 unsigned long regen_advance;
1312 unsigned long now = jiffies;
1313 s32 cnf_temp_preferred_lft;
1314 struct inet6_ifaddr *ift;
1315 struct ifa6_config cfg;
1316 long max_desync_factor;
1317 struct in6_addr addr;
1318 int ret = 0;
1319
1320 write_lock_bh(&idev->lock);
1321
1322 retry:
1323 in6_dev_hold(idev);
1324 if (idev->cnf.use_tempaddr <= 0) {
1325 write_unlock_bh(&idev->lock);
1326 pr_info("%s: use_tempaddr is disabled\n", __func__);
1327 in6_dev_put(idev);
1328 ret = -1;
1329 goto out;
1330 }
1331 spin_lock_bh(&ifp->lock);
1332 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1333 idev->cnf.use_tempaddr = -1; /*XXX*/
1334 spin_unlock_bh(&ifp->lock);
1335 write_unlock_bh(&idev->lock);
1336 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1337 __func__);
1338 in6_dev_put(idev);
1339 ret = -1;
1340 goto out;
1341 }
1342 in6_ifa_hold(ifp);
1343 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1344 ipv6_gen_rnd_iid(&addr);
1345
1346 age = (now - ifp->tstamp) / HZ;
1347
1348 regen_advance = idev->cnf.regen_max_retry *
1349 idev->cnf.dad_transmits *
1350 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1351
1352 /* recalculate max_desync_factor each time and update
1353 * idev->desync_factor if it's larger
1354 */
1355 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1356 max_desync_factor = min_t(__u32,
1357 idev->cnf.max_desync_factor,
1358 cnf_temp_preferred_lft - regen_advance);
1359
1360 if (unlikely(idev->desync_factor > max_desync_factor)) {
1361 if (max_desync_factor > 0) {
1362 get_random_bytes(&idev->desync_factor,
1363 sizeof(idev->desync_factor));
1364 idev->desync_factor %= max_desync_factor;
1365 } else {
1366 idev->desync_factor = 0;
1367 }
1368 }
1369
1370 memset(&cfg, 0, sizeof(cfg));
1371 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1372 idev->cnf.temp_valid_lft + age);
1373 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1374 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1375
1376 cfg.plen = ifp->prefix_len;
1377 tmp_tstamp = ifp->tstamp;
1378 spin_unlock_bh(&ifp->lock);
1379
1380 write_unlock_bh(&idev->lock);
1381
1382 /* A temporary address is created only if this calculated Preferred
1383 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1384 * an implementation must not create a temporary address with a zero
1385 * Preferred Lifetime.
1386 * Use age calculation as in addrconf_verify to avoid unnecessary
1387 * temporary addresses being generated.
1388 */
1389 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1390 if (cfg.preferred_lft <= regen_advance + age) {
1391 in6_ifa_put(ifp);
1392 in6_dev_put(idev);
1393 ret = -1;
1394 goto out;
1395 }
1396
1397 cfg.ifa_flags = IFA_F_TEMPORARY;
1398 /* set in addrconf_prefix_rcv() */
1399 if (ifp->flags & IFA_F_OPTIMISTIC)
1400 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1401
1402 cfg.pfx = &addr;
1403 cfg.scope = ipv6_addr_scope(cfg.pfx);
1404
1405 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1406 if (IS_ERR(ift)) {
1407 in6_ifa_put(ifp);
1408 in6_dev_put(idev);
1409 pr_info("%s: retry temporary address regeneration\n", __func__);
1410 write_lock_bh(&idev->lock);
1411 goto retry;
1412 }
1413
1414 spin_lock_bh(&ift->lock);
1415 ift->ifpub = ifp;
1416 ift->cstamp = now;
1417 ift->tstamp = tmp_tstamp;
1418 spin_unlock_bh(&ift->lock);
1419
1420 addrconf_dad_start(ift);
1421 in6_ifa_put(ift);
1422 in6_dev_put(idev);
1423 out:
1424 return ret;
1425 }
1426
1427 /*
1428 * Choose an appropriate source address (RFC3484)
1429 */
1430 enum {
1431 IPV6_SADDR_RULE_INIT = 0,
1432 IPV6_SADDR_RULE_LOCAL,
1433 IPV6_SADDR_RULE_SCOPE,
1434 IPV6_SADDR_RULE_PREFERRED,
1435 #ifdef CONFIG_IPV6_MIP6
1436 IPV6_SADDR_RULE_HOA,
1437 #endif
1438 IPV6_SADDR_RULE_OIF,
1439 IPV6_SADDR_RULE_LABEL,
1440 IPV6_SADDR_RULE_PRIVACY,
1441 IPV6_SADDR_RULE_ORCHID,
1442 IPV6_SADDR_RULE_PREFIX,
1443 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1444 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1445 #endif
1446 IPV6_SADDR_RULE_MAX
1447 };
1448
1449 struct ipv6_saddr_score {
1450 int rule;
1451 int addr_type;
1452 struct inet6_ifaddr *ifa;
1453 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1454 int scopedist;
1455 int matchlen;
1456 };
1457
1458 struct ipv6_saddr_dst {
1459 const struct in6_addr *addr;
1460 int ifindex;
1461 int scope;
1462 int label;
1463 unsigned int prefs;
1464 };
1465
1466 static inline int ipv6_saddr_preferred(int type)
1467 {
1468 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1469 return 1;
1470 return 0;
1471 }
1472
1473 static bool ipv6_use_optimistic_addr(struct net *net,
1474 struct inet6_dev *idev)
1475 {
1476 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1477 if (!idev)
1478 return false;
1479 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1480 return false;
1481 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1482 return false;
1483
1484 return true;
1485 #else
1486 return false;
1487 #endif
1488 }
1489
1490 static bool ipv6_allow_optimistic_dad(struct net *net,
1491 struct inet6_dev *idev)
1492 {
1493 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1494 if (!idev)
1495 return false;
1496 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1497 return false;
1498
1499 return true;
1500 #else
1501 return false;
1502 #endif
1503 }
1504
1505 static int ipv6_get_saddr_eval(struct net *net,
1506 struct ipv6_saddr_score *score,
1507 struct ipv6_saddr_dst *dst,
1508 int i)
1509 {
1510 int ret;
1511
1512 if (i <= score->rule) {
1513 switch (i) {
1514 case IPV6_SADDR_RULE_SCOPE:
1515 ret = score->scopedist;
1516 break;
1517 case IPV6_SADDR_RULE_PREFIX:
1518 ret = score->matchlen;
1519 break;
1520 default:
1521 ret = !!test_bit(i, score->scorebits);
1522 }
1523 goto out;
1524 }
1525
1526 switch (i) {
1527 case IPV6_SADDR_RULE_INIT:
1528 /* Rule 0: remember if hiscore is not ready yet */
1529 ret = !!score->ifa;
1530 break;
1531 case IPV6_SADDR_RULE_LOCAL:
1532 /* Rule 1: Prefer same address */
1533 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1534 break;
1535 case IPV6_SADDR_RULE_SCOPE:
1536 /* Rule 2: Prefer appropriate scope
1537 *
1538 * ret
1539 * ^
1540 * -1 | d 15
1541 * ---+--+-+---> scope
1542 * |
1543 * | d is scope of the destination.
1544 * B-d | \
1545 * | \ <- smaller scope is better if
1546 * B-15 | \ if scope is enough for destination.
1547 * | ret = B - scope (-1 <= scope >= d <= 15).
1548 * d-C-1 | /
1549 * |/ <- greater is better
1550 * -C / if scope is not enough for destination.
1551 * /| ret = scope - C (-1 <= d < scope <= 15).
1552 *
1553 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1554 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1555 * Assume B = 0 and we get C > 29.
1556 */
1557 ret = __ipv6_addr_src_scope(score->addr_type);
1558 if (ret >= dst->scope)
1559 ret = -ret;
1560 else
1561 ret -= 128; /* 30 is enough */
1562 score->scopedist = ret;
1563 break;
1564 case IPV6_SADDR_RULE_PREFERRED:
1565 {
1566 /* Rule 3: Avoid deprecated and optimistic addresses */
1567 u8 avoid = IFA_F_DEPRECATED;
1568
1569 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1570 avoid |= IFA_F_OPTIMISTIC;
1571 ret = ipv6_saddr_preferred(score->addr_type) ||
1572 !(score->ifa->flags & avoid);
1573 break;
1574 }
1575 #ifdef CONFIG_IPV6_MIP6
1576 case IPV6_SADDR_RULE_HOA:
1577 {
1578 /* Rule 4: Prefer home address */
1579 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1580 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1581 break;
1582 }
1583 #endif
1584 case IPV6_SADDR_RULE_OIF:
1585 /* Rule 5: Prefer outgoing interface */
1586 ret = (!dst->ifindex ||
1587 dst->ifindex == score->ifa->idev->dev->ifindex);
1588 break;
1589 case IPV6_SADDR_RULE_LABEL:
1590 /* Rule 6: Prefer matching label */
1591 ret = ipv6_addr_label(net,
1592 &score->ifa->addr, score->addr_type,
1593 score->ifa->idev->dev->ifindex) == dst->label;
1594 break;
1595 case IPV6_SADDR_RULE_PRIVACY:
1596 {
1597 /* Rule 7: Prefer public address
1598 * Note: prefer temporary address if use_tempaddr >= 2
1599 */
1600 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1601 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1602 score->ifa->idev->cnf.use_tempaddr >= 2;
1603 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1604 break;
1605 }
1606 case IPV6_SADDR_RULE_ORCHID:
1607 /* Rule 8-: Prefer ORCHID vs ORCHID or
1608 * non-ORCHID vs non-ORCHID
1609 */
1610 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1611 ipv6_addr_orchid(dst->addr));
1612 break;
1613 case IPV6_SADDR_RULE_PREFIX:
1614 /* Rule 8: Use longest matching prefix */
1615 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1616 if (ret > score->ifa->prefix_len)
1617 ret = score->ifa->prefix_len;
1618 score->matchlen = ret;
1619 break;
1620 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1621 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1622 /* Optimistic addresses still have lower precedence than other
1623 * preferred addresses.
1624 */
1625 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1626 break;
1627 #endif
1628 default:
1629 ret = 0;
1630 }
1631
1632 if (ret)
1633 __set_bit(i, score->scorebits);
1634 score->rule = i;
1635 out:
1636 return ret;
1637 }
1638
1639 static int __ipv6_dev_get_saddr(struct net *net,
1640 struct ipv6_saddr_dst *dst,
1641 struct inet6_dev *idev,
1642 struct ipv6_saddr_score *scores,
1643 int hiscore_idx)
1644 {
1645 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1646
1647 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1648 int i;
1649
1650 /*
1651 * - Tentative Address (RFC2462 section 5.4)
1652 * - A tentative address is not considered
1653 * "assigned to an interface" in the traditional
1654 * sense, unless it is also flagged as optimistic.
1655 * - Candidate Source Address (section 4)
1656 * - In any case, anycast addresses, multicast
1657 * addresses, and the unspecified address MUST
1658 * NOT be included in a candidate set.
1659 */
1660 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1661 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1662 continue;
1663
1664 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1665
1666 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1667 score->addr_type & IPV6_ADDR_MULTICAST)) {
1668 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1669 idev->dev->name);
1670 continue;
1671 }
1672
1673 score->rule = -1;
1674 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1675
1676 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1677 int minihiscore, miniscore;
1678
1679 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1680 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1681
1682 if (minihiscore > miniscore) {
1683 if (i == IPV6_SADDR_RULE_SCOPE &&
1684 score->scopedist > 0) {
1685 /*
1686 * special case:
1687 * each remaining entry
1688 * has too small (not enough)
1689 * scope, because ifa entries
1690 * are sorted by their scope
1691 * values.
1692 */
1693 goto out;
1694 }
1695 break;
1696 } else if (minihiscore < miniscore) {
1697 swap(hiscore, score);
1698 hiscore_idx = 1 - hiscore_idx;
1699
1700 /* restore our iterator */
1701 score->ifa = hiscore->ifa;
1702
1703 break;
1704 }
1705 }
1706 }
1707 out:
1708 return hiscore_idx;
1709 }
1710
1711 static int ipv6_get_saddr_master(struct net *net,
1712 const struct net_device *dst_dev,
1713 const struct net_device *master,
1714 struct ipv6_saddr_dst *dst,
1715 struct ipv6_saddr_score *scores,
1716 int hiscore_idx)
1717 {
1718 struct inet6_dev *idev;
1719
1720 idev = __in6_dev_get(dst_dev);
1721 if (idev)
1722 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1723 scores, hiscore_idx);
1724
1725 idev = __in6_dev_get(master);
1726 if (idev)
1727 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1728 scores, hiscore_idx);
1729
1730 return hiscore_idx;
1731 }
1732
1733 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1734 const struct in6_addr *daddr, unsigned int prefs,
1735 struct in6_addr *saddr)
1736 {
1737 struct ipv6_saddr_score scores[2], *hiscore;
1738 struct ipv6_saddr_dst dst;
1739 struct inet6_dev *idev;
1740 struct net_device *dev;
1741 int dst_type;
1742 bool use_oif_addr = false;
1743 int hiscore_idx = 0;
1744 int ret = 0;
1745
1746 dst_type = __ipv6_addr_type(daddr);
1747 dst.addr = daddr;
1748 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1749 dst.scope = __ipv6_addr_src_scope(dst_type);
1750 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1751 dst.prefs = prefs;
1752
1753 scores[hiscore_idx].rule = -1;
1754 scores[hiscore_idx].ifa = NULL;
1755
1756 rcu_read_lock();
1757
1758 /* Candidate Source Address (section 4)
1759 * - multicast and link-local destination address,
1760 * the set of candidate source address MUST only
1761 * include addresses assigned to interfaces
1762 * belonging to the same link as the outgoing
1763 * interface.
1764 * (- For site-local destination addresses, the
1765 * set of candidate source addresses MUST only
1766 * include addresses assigned to interfaces
1767 * belonging to the same site as the outgoing
1768 * interface.)
1769 * - "It is RECOMMENDED that the candidate source addresses
1770 * be the set of unicast addresses assigned to the
1771 * interface that will be used to send to the destination
1772 * (the 'outgoing' interface)." (RFC 6724)
1773 */
1774 if (dst_dev) {
1775 idev = __in6_dev_get(dst_dev);
1776 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1777 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1778 (idev && idev->cnf.use_oif_addrs_only)) {
1779 use_oif_addr = true;
1780 }
1781 }
1782
1783 if (use_oif_addr) {
1784 if (idev)
1785 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1786 } else {
1787 const struct net_device *master;
1788 int master_idx = 0;
1789
1790 /* if dst_dev exists and is enslaved to an L3 device, then
1791 * prefer addresses from dst_dev and then the master over
1792 * any other enslaved devices in the L3 domain.
1793 */
1794 master = l3mdev_master_dev_rcu(dst_dev);
1795 if (master) {
1796 master_idx = master->ifindex;
1797
1798 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1799 master, &dst,
1800 scores, hiscore_idx);
1801
1802 if (scores[hiscore_idx].ifa)
1803 goto out;
1804 }
1805
1806 for_each_netdev_rcu(net, dev) {
1807 /* only consider addresses on devices in the
1808 * same L3 domain
1809 */
1810 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1811 continue;
1812 idev = __in6_dev_get(dev);
1813 if (!idev)
1814 continue;
1815 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1816 }
1817 }
1818
1819 out:
1820 hiscore = &scores[hiscore_idx];
1821 if (!hiscore->ifa)
1822 ret = -EADDRNOTAVAIL;
1823 else
1824 *saddr = hiscore->ifa->addr;
1825
1826 rcu_read_unlock();
1827 return ret;
1828 }
1829 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1830
1831 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1832 u32 banned_flags)
1833 {
1834 struct inet6_ifaddr *ifp;
1835 int err = -EADDRNOTAVAIL;
1836
1837 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1838 if (ifp->scope > IFA_LINK)
1839 break;
1840 if (ifp->scope == IFA_LINK &&
1841 !(ifp->flags & banned_flags)) {
1842 *addr = ifp->addr;
1843 err = 0;
1844 break;
1845 }
1846 }
1847 return err;
1848 }
1849
1850 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1851 u32 banned_flags)
1852 {
1853 struct inet6_dev *idev;
1854 int err = -EADDRNOTAVAIL;
1855
1856 rcu_read_lock();
1857 idev = __in6_dev_get(dev);
1858 if (idev) {
1859 read_lock_bh(&idev->lock);
1860 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1861 read_unlock_bh(&idev->lock);
1862 }
1863 rcu_read_unlock();
1864 return err;
1865 }
1866
1867 static int ipv6_count_addresses(const struct inet6_dev *idev)
1868 {
1869 const struct inet6_ifaddr *ifp;
1870 int cnt = 0;
1871
1872 rcu_read_lock();
1873 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1874 cnt++;
1875 rcu_read_unlock();
1876 return cnt;
1877 }
1878
1879 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1880 const struct net_device *dev, int strict)
1881 {
1882 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1883 strict, IFA_F_TENTATIVE);
1884 }
1885 EXPORT_SYMBOL(ipv6_chk_addr);
1886
1887 /* device argument is used to find the L3 domain of interest. If
1888 * skip_dev_check is set, then the ifp device is not checked against
1889 * the passed in dev argument. So the 2 cases for addresses checks are:
1890 * 1. does the address exist in the L3 domain that dev is part of
1891 * (skip_dev_check = true), or
1892 *
1893 * 2. does the address exist on the specific device
1894 * (skip_dev_check = false)
1895 */
1896 static struct net_device *
1897 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1898 const struct net_device *dev, bool skip_dev_check,
1899 int strict, u32 banned_flags)
1900 {
1901 unsigned int hash = inet6_addr_hash(net, addr);
1902 struct net_device *l3mdev, *ndev;
1903 struct inet6_ifaddr *ifp;
1904 u32 ifp_flags;
1905
1906 rcu_read_lock();
1907
1908 l3mdev = l3mdev_master_dev_rcu(dev);
1909 if (skip_dev_check)
1910 dev = NULL;
1911
1912 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1913 ndev = ifp->idev->dev;
1914 if (!net_eq(dev_net(ndev), net))
1915 continue;
1916
1917 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1918 continue;
1919
1920 /* Decouple optimistic from tentative for evaluation here.
1921 * Ban optimistic addresses explicitly, when required.
1922 */
1923 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1924 ? (ifp->flags&~IFA_F_TENTATIVE)
1925 : ifp->flags;
1926 if (ipv6_addr_equal(&ifp->addr, addr) &&
1927 !(ifp_flags&banned_flags) &&
1928 (!dev || ndev == dev ||
1929 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1930 rcu_read_unlock();
1931 return ndev;
1932 }
1933 }
1934
1935 rcu_read_unlock();
1936 return NULL;
1937 }
1938
1939 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1940 const struct net_device *dev, bool skip_dev_check,
1941 int strict, u32 banned_flags)
1942 {
1943 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1944 strict, banned_flags) ? 1 : 0;
1945 }
1946 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1947
1948
1949 /* Compares an address/prefix_len with addresses on device @dev.
1950 * If one is found it returns true.
1951 */
1952 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1953 const unsigned int prefix_len, struct net_device *dev)
1954 {
1955 const struct inet6_ifaddr *ifa;
1956 const struct inet6_dev *idev;
1957 bool ret = false;
1958
1959 rcu_read_lock();
1960 idev = __in6_dev_get(dev);
1961 if (idev) {
1962 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1963 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1964 if (ret)
1965 break;
1966 }
1967 }
1968 rcu_read_unlock();
1969
1970 return ret;
1971 }
1972 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1973
1974 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1975 {
1976 const struct inet6_ifaddr *ifa;
1977 const struct inet6_dev *idev;
1978 int onlink;
1979
1980 onlink = 0;
1981 rcu_read_lock();
1982 idev = __in6_dev_get(dev);
1983 if (idev) {
1984 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1985 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1986 ifa->prefix_len);
1987 if (onlink)
1988 break;
1989 }
1990 }
1991 rcu_read_unlock();
1992 return onlink;
1993 }
1994 EXPORT_SYMBOL(ipv6_chk_prefix);
1995
1996 /**
1997 * ipv6_dev_find - find the first device with a given source address.
1998 * @net: the net namespace
1999 * @addr: the source address
2000 * @dev: used to find the L3 domain of interest
2001 *
2002 * The caller should be protected by RCU, or RTNL.
2003 */
2004 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2005 struct net_device *dev)
2006 {
2007 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2008 IFA_F_TENTATIVE);
2009 }
2010 EXPORT_SYMBOL(ipv6_dev_find);
2011
2012 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2013 struct net_device *dev, int strict)
2014 {
2015 unsigned int hash = inet6_addr_hash(net, addr);
2016 struct inet6_ifaddr *ifp, *result = NULL;
2017
2018 rcu_read_lock();
2019 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2020 if (!net_eq(dev_net(ifp->idev->dev), net))
2021 continue;
2022 if (ipv6_addr_equal(&ifp->addr, addr)) {
2023 if (!dev || ifp->idev->dev == dev ||
2024 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2025 result = ifp;
2026 in6_ifa_hold(ifp);
2027 break;
2028 }
2029 }
2030 }
2031 rcu_read_unlock();
2032
2033 return result;
2034 }
2035
2036 /* Gets referenced address, destroys ifaddr */
2037
2038 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2039 {
2040 if (dad_failed)
2041 ifp->flags |= IFA_F_DADFAILED;
2042
2043 if (ifp->flags&IFA_F_TEMPORARY) {
2044 struct inet6_ifaddr *ifpub;
2045 spin_lock_bh(&ifp->lock);
2046 ifpub = ifp->ifpub;
2047 if (ifpub) {
2048 in6_ifa_hold(ifpub);
2049 spin_unlock_bh(&ifp->lock);
2050 ipv6_create_tempaddr(ifpub, true);
2051 in6_ifa_put(ifpub);
2052 } else {
2053 spin_unlock_bh(&ifp->lock);
2054 }
2055 ipv6_del_addr(ifp);
2056 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2057 spin_lock_bh(&ifp->lock);
2058 addrconf_del_dad_work(ifp);
2059 ifp->flags |= IFA_F_TENTATIVE;
2060 if (dad_failed)
2061 ifp->flags &= ~IFA_F_OPTIMISTIC;
2062 spin_unlock_bh(&ifp->lock);
2063 if (dad_failed)
2064 ipv6_ifa_notify(0, ifp);
2065 in6_ifa_put(ifp);
2066 } else {
2067 ipv6_del_addr(ifp);
2068 }
2069 }
2070
2071 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2072 {
2073 int err = -ENOENT;
2074
2075 spin_lock_bh(&ifp->lock);
2076 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2077 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2078 err = 0;
2079 }
2080 spin_unlock_bh(&ifp->lock);
2081
2082 return err;
2083 }
2084
2085 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2086 {
2087 struct inet6_dev *idev = ifp->idev;
2088 struct net *net = dev_net(ifp->idev->dev);
2089
2090 if (addrconf_dad_end(ifp)) {
2091 in6_ifa_put(ifp);
2092 return;
2093 }
2094
2095 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2096 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2097
2098 spin_lock_bh(&ifp->lock);
2099
2100 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2101 struct in6_addr new_addr;
2102 struct inet6_ifaddr *ifp2;
2103 int retries = ifp->stable_privacy_retry + 1;
2104 struct ifa6_config cfg = {
2105 .pfx = &new_addr,
2106 .plen = ifp->prefix_len,
2107 .ifa_flags = ifp->flags,
2108 .valid_lft = ifp->valid_lft,
2109 .preferred_lft = ifp->prefered_lft,
2110 .scope = ifp->scope,
2111 };
2112
2113 if (retries > net->ipv6.sysctl.idgen_retries) {
2114 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2115 ifp->idev->dev->name);
2116 goto errdad;
2117 }
2118
2119 new_addr = ifp->addr;
2120 if (ipv6_generate_stable_address(&new_addr, retries,
2121 idev))
2122 goto errdad;
2123
2124 spin_unlock_bh(&ifp->lock);
2125
2126 if (idev->cnf.max_addresses &&
2127 ipv6_count_addresses(idev) >=
2128 idev->cnf.max_addresses)
2129 goto lock_errdad;
2130
2131 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2132 ifp->idev->dev->name);
2133
2134 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2135 if (IS_ERR(ifp2))
2136 goto lock_errdad;
2137
2138 spin_lock_bh(&ifp2->lock);
2139 ifp2->stable_privacy_retry = retries;
2140 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2141 spin_unlock_bh(&ifp2->lock);
2142
2143 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2144 in6_ifa_put(ifp2);
2145 lock_errdad:
2146 spin_lock_bh(&ifp->lock);
2147 }
2148
2149 errdad:
2150 /* transition from _POSTDAD to _ERRDAD */
2151 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2152 spin_unlock_bh(&ifp->lock);
2153
2154 addrconf_mod_dad_work(ifp, 0);
2155 in6_ifa_put(ifp);
2156 }
2157
2158 /* Join to solicited addr multicast group.
2159 * caller must hold RTNL */
2160 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2161 {
2162 struct in6_addr maddr;
2163
2164 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2165 return;
2166
2167 addrconf_addr_solict_mult(addr, &maddr);
2168 ipv6_dev_mc_inc(dev, &maddr);
2169 }
2170
2171 /* caller must hold RTNL */
2172 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2173 {
2174 struct in6_addr maddr;
2175
2176 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2177 return;
2178
2179 addrconf_addr_solict_mult(addr, &maddr);
2180 __ipv6_dev_mc_dec(idev, &maddr);
2181 }
2182
2183 /* caller must hold RTNL */
2184 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2185 {
2186 struct in6_addr addr;
2187
2188 if (ifp->prefix_len >= 127) /* RFC 6164 */
2189 return;
2190 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2191 if (ipv6_addr_any(&addr))
2192 return;
2193 __ipv6_dev_ac_inc(ifp->idev, &addr);
2194 }
2195
2196 /* caller must hold RTNL */
2197 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2198 {
2199 struct in6_addr addr;
2200
2201 if (ifp->prefix_len >= 127) /* RFC 6164 */
2202 return;
2203 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2204 if (ipv6_addr_any(&addr))
2205 return;
2206 __ipv6_dev_ac_dec(ifp->idev, &addr);
2207 }
2208
2209 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2210 {
2211 switch (dev->addr_len) {
2212 case ETH_ALEN:
2213 memcpy(eui, dev->dev_addr, 3);
2214 eui[3] = 0xFF;
2215 eui[4] = 0xFE;
2216 memcpy(eui + 5, dev->dev_addr + 3, 3);
2217 break;
2218 case EUI64_ADDR_LEN:
2219 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2220 eui[0] ^= 2;
2221 break;
2222 default:
2223 return -1;
2224 }
2225
2226 return 0;
2227 }
2228
2229 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2230 {
2231 union fwnet_hwaddr *ha;
2232
2233 if (dev->addr_len != FWNET_ALEN)
2234 return -1;
2235
2236 ha = (union fwnet_hwaddr *)dev->dev_addr;
2237
2238 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2239 eui[0] ^= 2;
2240 return 0;
2241 }
2242
2243 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2244 {
2245 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2246 if (dev->addr_len != ARCNET_ALEN)
2247 return -1;
2248 memset(eui, 0, 7);
2249 eui[7] = *(u8 *)dev->dev_addr;
2250 return 0;
2251 }
2252
2253 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2254 {
2255 if (dev->addr_len != INFINIBAND_ALEN)
2256 return -1;
2257 memcpy(eui, dev->dev_addr + 12, 8);
2258 eui[0] |= 2;
2259 return 0;
2260 }
2261
2262 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2263 {
2264 if (addr == 0)
2265 return -1;
2266 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2267 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2268 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2269 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2270 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2271 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2272 eui[1] = 0;
2273 eui[2] = 0x5E;
2274 eui[3] = 0xFE;
2275 memcpy(eui + 4, &addr, 4);
2276 return 0;
2277 }
2278
2279 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2280 {
2281 if (dev->priv_flags & IFF_ISATAP)
2282 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2283 return -1;
2284 }
2285
2286 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2287 {
2288 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2289 }
2290
2291 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2292 {
2293 memcpy(eui, dev->perm_addr, 3);
2294 memcpy(eui + 5, dev->perm_addr + 3, 3);
2295 eui[3] = 0xFF;
2296 eui[4] = 0xFE;
2297 eui[0] ^= 2;
2298 return 0;
2299 }
2300
2301 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2302 {
2303 switch (dev->type) {
2304 case ARPHRD_ETHER:
2305 case ARPHRD_FDDI:
2306 return addrconf_ifid_eui48(eui, dev);
2307 case ARPHRD_ARCNET:
2308 return addrconf_ifid_arcnet(eui, dev);
2309 case ARPHRD_INFINIBAND:
2310 return addrconf_ifid_infiniband(eui, dev);
2311 case ARPHRD_SIT:
2312 return addrconf_ifid_sit(eui, dev);
2313 case ARPHRD_IPGRE:
2314 case ARPHRD_TUNNEL:
2315 return addrconf_ifid_gre(eui, dev);
2316 case ARPHRD_6LOWPAN:
2317 return addrconf_ifid_6lowpan(eui, dev);
2318 case ARPHRD_IEEE1394:
2319 return addrconf_ifid_ieee1394(eui, dev);
2320 case ARPHRD_TUNNEL6:
2321 case ARPHRD_IP6GRE:
2322 case ARPHRD_RAWIP:
2323 return addrconf_ifid_ip6tnl(eui, dev);
2324 }
2325 return -1;
2326 }
2327
2328 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2329 {
2330 int err = -1;
2331 struct inet6_ifaddr *ifp;
2332
2333 read_lock_bh(&idev->lock);
2334 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2335 if (ifp->scope > IFA_LINK)
2336 break;
2337 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2338 memcpy(eui, ifp->addr.s6_addr+8, 8);
2339 err = 0;
2340 break;
2341 }
2342 }
2343 read_unlock_bh(&idev->lock);
2344 return err;
2345 }
2346
2347 /* Generation of a randomized Interface Identifier
2348 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2349 */
2350
2351 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2352 {
2353 regen:
2354 get_random_bytes(&addr->s6_addr[8], 8);
2355
2356 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2357 * check if generated address is not inappropriate:
2358 *
2359 * - Reserved IPv6 Interface Identifers
2360 * - XXX: already assigned to an address on the device
2361 */
2362
2363 /* Subnet-router anycast: 0000:0000:0000:0000 */
2364 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2365 goto regen;
2366
2367 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2368 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2369 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2370 */
2371 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2372 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2373 goto regen;
2374
2375 /* Reserved subnet anycast addresses */
2376 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2377 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2378 goto regen;
2379 }
2380
2381 /*
2382 * Add prefix route.
2383 */
2384
2385 static void
2386 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2387 struct net_device *dev, unsigned long expires,
2388 u32 flags, gfp_t gfp_flags)
2389 {
2390 struct fib6_config cfg = {
2391 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2392 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2393 .fc_ifindex = dev->ifindex,
2394 .fc_expires = expires,
2395 .fc_dst_len = plen,
2396 .fc_flags = RTF_UP | flags,
2397 .fc_nlinfo.nl_net = dev_net(dev),
2398 .fc_protocol = RTPROT_KERNEL,
2399 .fc_type = RTN_UNICAST,
2400 };
2401
2402 cfg.fc_dst = *pfx;
2403
2404 /* Prevent useless cloning on PtP SIT.
2405 This thing is done here expecting that the whole
2406 class of non-broadcast devices need not cloning.
2407 */
2408 #if IS_ENABLED(CONFIG_IPV6_SIT)
2409 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2410 cfg.fc_flags |= RTF_NONEXTHOP;
2411 #endif
2412
2413 ip6_route_add(&cfg, gfp_flags, NULL);
2414 }
2415
2416
2417 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2418 int plen,
2419 const struct net_device *dev,
2420 u32 flags, u32 noflags,
2421 bool no_gw)
2422 {
2423 struct fib6_node *fn;
2424 struct fib6_info *rt = NULL;
2425 struct fib6_table *table;
2426 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2427
2428 table = fib6_get_table(dev_net(dev), tb_id);
2429 if (!table)
2430 return NULL;
2431
2432 rcu_read_lock();
2433 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2434 if (!fn)
2435 goto out;
2436
2437 for_each_fib6_node_rt_rcu(fn) {
2438 /* prefix routes only use builtin fib6_nh */
2439 if (rt->nh)
2440 continue;
2441
2442 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2443 continue;
2444 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2445 continue;
2446 if ((rt->fib6_flags & flags) != flags)
2447 continue;
2448 if ((rt->fib6_flags & noflags) != 0)
2449 continue;
2450 if (!fib6_info_hold_safe(rt))
2451 continue;
2452 break;
2453 }
2454 out:
2455 rcu_read_unlock();
2456 return rt;
2457 }
2458
2459
2460 /* Create "default" multicast route to the interface */
2461
2462 static void addrconf_add_mroute(struct net_device *dev)
2463 {
2464 struct fib6_config cfg = {
2465 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2466 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2467 .fc_ifindex = dev->ifindex,
2468 .fc_dst_len = 8,
2469 .fc_flags = RTF_UP,
2470 .fc_type = RTN_UNICAST,
2471 .fc_nlinfo.nl_net = dev_net(dev),
2472 };
2473
2474 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2475
2476 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2477 }
2478
2479 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2480 {
2481 struct inet6_dev *idev;
2482
2483 ASSERT_RTNL();
2484
2485 idev = ipv6_find_idev(dev);
2486 if (IS_ERR(idev))
2487 return idev;
2488
2489 if (idev->cnf.disable_ipv6)
2490 return ERR_PTR(-EACCES);
2491
2492 /* Add default multicast route */
2493 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2494 addrconf_add_mroute(dev);
2495
2496 return idev;
2497 }
2498
2499 static void manage_tempaddrs(struct inet6_dev *idev,
2500 struct inet6_ifaddr *ifp,
2501 __u32 valid_lft, __u32 prefered_lft,
2502 bool create, unsigned long now)
2503 {
2504 u32 flags;
2505 struct inet6_ifaddr *ift;
2506
2507 read_lock_bh(&idev->lock);
2508 /* update all temporary addresses in the list */
2509 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2510 int age, max_valid, max_prefered;
2511
2512 if (ifp != ift->ifpub)
2513 continue;
2514
2515 /* RFC 4941 section 3.3:
2516 * If a received option will extend the lifetime of a public
2517 * address, the lifetimes of temporary addresses should
2518 * be extended, subject to the overall constraint that no
2519 * temporary addresses should ever remain "valid" or "preferred"
2520 * for a time longer than (TEMP_VALID_LIFETIME) or
2521 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2522 */
2523 age = (now - ift->cstamp) / HZ;
2524 max_valid = idev->cnf.temp_valid_lft - age;
2525 if (max_valid < 0)
2526 max_valid = 0;
2527
2528 max_prefered = idev->cnf.temp_prefered_lft -
2529 idev->desync_factor - age;
2530 if (max_prefered < 0)
2531 max_prefered = 0;
2532
2533 if (valid_lft > max_valid)
2534 valid_lft = max_valid;
2535
2536 if (prefered_lft > max_prefered)
2537 prefered_lft = max_prefered;
2538
2539 spin_lock(&ift->lock);
2540 flags = ift->flags;
2541 ift->valid_lft = valid_lft;
2542 ift->prefered_lft = prefered_lft;
2543 ift->tstamp = now;
2544 if (prefered_lft > 0)
2545 ift->flags &= ~IFA_F_DEPRECATED;
2546
2547 spin_unlock(&ift->lock);
2548 if (!(flags&IFA_F_TENTATIVE))
2549 ipv6_ifa_notify(0, ift);
2550 }
2551
2552 if ((create || list_empty(&idev->tempaddr_list)) &&
2553 idev->cnf.use_tempaddr > 0) {
2554 /* When a new public address is created as described
2555 * in [ADDRCONF], also create a new temporary address.
2556 * Also create a temporary address if it's enabled but
2557 * no temporary address currently exists.
2558 */
2559 read_unlock_bh(&idev->lock);
2560 ipv6_create_tempaddr(ifp, false);
2561 } else {
2562 read_unlock_bh(&idev->lock);
2563 }
2564 }
2565
2566 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2567 {
2568 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2569 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2570 }
2571
2572 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2573 const struct prefix_info *pinfo,
2574 struct inet6_dev *in6_dev,
2575 const struct in6_addr *addr, int addr_type,
2576 u32 addr_flags, bool sllao, bool tokenized,
2577 __u32 valid_lft, u32 prefered_lft)
2578 {
2579 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2580 int create = 0;
2581
2582 if (!ifp && valid_lft) {
2583 int max_addresses = in6_dev->cnf.max_addresses;
2584 struct ifa6_config cfg = {
2585 .pfx = addr,
2586 .plen = pinfo->prefix_len,
2587 .ifa_flags = addr_flags,
2588 .valid_lft = valid_lft,
2589 .preferred_lft = prefered_lft,
2590 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2591 };
2592
2593 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2594 if ((net->ipv6.devconf_all->optimistic_dad ||
2595 in6_dev->cnf.optimistic_dad) &&
2596 !net->ipv6.devconf_all->forwarding && sllao)
2597 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2598 #endif
2599
2600 /* Do not allow to create too much of autoconfigured
2601 * addresses; this would be too easy way to crash kernel.
2602 */
2603 if (!max_addresses ||
2604 ipv6_count_addresses(in6_dev) < max_addresses)
2605 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2606
2607 if (IS_ERR_OR_NULL(ifp))
2608 return -1;
2609
2610 create = 1;
2611 spin_lock_bh(&ifp->lock);
2612 ifp->flags |= IFA_F_MANAGETEMPADDR;
2613 ifp->cstamp = jiffies;
2614 ifp->tokenized = tokenized;
2615 spin_unlock_bh(&ifp->lock);
2616 addrconf_dad_start(ifp);
2617 }
2618
2619 if (ifp) {
2620 u32 flags;
2621 unsigned long now;
2622 u32 stored_lft;
2623
2624 /* Update lifetime (RFC4862 5.5.3 e)
2625 * We deviate from RFC4862 by honoring all Valid Lifetimes to
2626 * improve the reaction of SLAAC to renumbering events
2627 * (draft-gont-6man-slaac-renum-06, Section 4.2)
2628 */
2629 spin_lock_bh(&ifp->lock);
2630 now = jiffies;
2631 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2632 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2633 else
2634 stored_lft = 0;
2635
2636 if (!create && stored_lft) {
2637 ifp->valid_lft = valid_lft;
2638 ifp->prefered_lft = prefered_lft;
2639 ifp->tstamp = now;
2640 flags = ifp->flags;
2641 ifp->flags &= ~IFA_F_DEPRECATED;
2642 spin_unlock_bh(&ifp->lock);
2643
2644 if (!(flags&IFA_F_TENTATIVE))
2645 ipv6_ifa_notify(0, ifp);
2646 } else
2647 spin_unlock_bh(&ifp->lock);
2648
2649 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2650 create, now);
2651
2652 in6_ifa_put(ifp);
2653 addrconf_verify();
2654 }
2655
2656 return 0;
2657 }
2658 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2659
2660 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2661 {
2662 struct prefix_info *pinfo;
2663 __u32 valid_lft;
2664 __u32 prefered_lft;
2665 int addr_type, err;
2666 u32 addr_flags = 0;
2667 struct inet6_dev *in6_dev;
2668 struct net *net = dev_net(dev);
2669
2670 pinfo = (struct prefix_info *) opt;
2671
2672 if (len < sizeof(struct prefix_info)) {
2673 netdev_dbg(dev, "addrconf: prefix option too short\n");
2674 return;
2675 }
2676
2677 /*
2678 * Validation checks ([ADDRCONF], page 19)
2679 */
2680
2681 addr_type = ipv6_addr_type(&pinfo->prefix);
2682
2683 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2684 return;
2685
2686 valid_lft = ntohl(pinfo->valid);
2687 prefered_lft = ntohl(pinfo->prefered);
2688
2689 if (prefered_lft > valid_lft) {
2690 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2691 return;
2692 }
2693
2694 in6_dev = in6_dev_get(dev);
2695
2696 if (!in6_dev) {
2697 net_dbg_ratelimited("addrconf: device %s not configured\n",
2698 dev->name);
2699 return;
2700 }
2701
2702 /*
2703 * Two things going on here:
2704 * 1) Add routes for on-link prefixes
2705 * 2) Configure prefixes with the auto flag set
2706 */
2707
2708 if (pinfo->onlink) {
2709 struct fib6_info *rt;
2710 unsigned long rt_expires;
2711
2712 /* Avoid arithmetic overflow. Really, we could
2713 * save rt_expires in seconds, likely valid_lft,
2714 * but it would require division in fib gc, that it
2715 * not good.
2716 */
2717 if (HZ > USER_HZ)
2718 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2719 else
2720 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2721
2722 if (addrconf_finite_timeout(rt_expires))
2723 rt_expires *= HZ;
2724
2725 rt = addrconf_get_prefix_route(&pinfo->prefix,
2726 pinfo->prefix_len,
2727 dev,
2728 RTF_ADDRCONF | RTF_PREFIX_RT,
2729 RTF_DEFAULT, true);
2730
2731 if (rt) {
2732 /* Autoconf prefix route */
2733 if (valid_lft == 0) {
2734 ip6_del_rt(net, rt, false);
2735 rt = NULL;
2736 } else if (addrconf_finite_timeout(rt_expires)) {
2737 /* not infinity */
2738 fib6_set_expires(rt, jiffies + rt_expires);
2739 } else {
2740 fib6_clean_expires(rt);
2741 }
2742 } else if (valid_lft) {
2743 clock_t expires = 0;
2744 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2745 if (addrconf_finite_timeout(rt_expires)) {
2746 /* not infinity */
2747 flags |= RTF_EXPIRES;
2748 expires = jiffies_to_clock_t(rt_expires);
2749 }
2750 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2751 0, dev, expires, flags,
2752 GFP_ATOMIC);
2753 }
2754 fib6_info_release(rt);
2755 }
2756
2757 /* Try to figure out our local address for this prefix */
2758
2759 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2760 struct in6_addr addr;
2761 bool tokenized = false, dev_addr_generated = false;
2762
2763 if (pinfo->prefix_len == 64) {
2764 memcpy(&addr, &pinfo->prefix, 8);
2765
2766 if (!ipv6_addr_any(&in6_dev->token)) {
2767 read_lock_bh(&in6_dev->lock);
2768 memcpy(addr.s6_addr + 8,
2769 in6_dev->token.s6_addr + 8, 8);
2770 read_unlock_bh(&in6_dev->lock);
2771 tokenized = true;
2772 } else if (is_addr_mode_generate_stable(in6_dev) &&
2773 !ipv6_generate_stable_address(&addr, 0,
2774 in6_dev)) {
2775 addr_flags |= IFA_F_STABLE_PRIVACY;
2776 goto ok;
2777 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2778 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2779 goto put;
2780 } else {
2781 dev_addr_generated = true;
2782 }
2783 goto ok;
2784 }
2785 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2786 pinfo->prefix_len);
2787 goto put;
2788
2789 ok:
2790 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2791 &addr, addr_type,
2792 addr_flags, sllao,
2793 tokenized, valid_lft,
2794 prefered_lft);
2795 if (err)
2796 goto put;
2797
2798 /* Ignore error case here because previous prefix add addr was
2799 * successful which will be notified.
2800 */
2801 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2802 addr_type, addr_flags, sllao,
2803 tokenized, valid_lft,
2804 prefered_lft,
2805 dev_addr_generated);
2806 }
2807 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2808 put:
2809 in6_dev_put(in6_dev);
2810 }
2811
2812 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2813 struct in6_ifreq *ireq)
2814 {
2815 struct ip_tunnel_parm p = { };
2816 int err;
2817
2818 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2819 return -EADDRNOTAVAIL;
2820
2821 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2822 p.iph.version = 4;
2823 p.iph.ihl = 5;
2824 p.iph.protocol = IPPROTO_IPV6;
2825 p.iph.ttl = 64;
2826
2827 if (!dev->netdev_ops->ndo_tunnel_ctl)
2828 return -EOPNOTSUPP;
2829 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2830 if (err)
2831 return err;
2832
2833 dev = __dev_get_by_name(net, p.name);
2834 if (!dev)
2835 return -ENOBUFS;
2836 return dev_open(dev, NULL);
2837 }
2838
2839 /*
2840 * Set destination address.
2841 * Special case for SIT interfaces where we create a new "virtual"
2842 * device.
2843 */
2844 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2845 {
2846 struct net_device *dev;
2847 struct in6_ifreq ireq;
2848 int err = -ENODEV;
2849
2850 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2851 return -ENODEV;
2852 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2853 return -EFAULT;
2854
2855 rtnl_lock();
2856 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2857 if (dev && dev->type == ARPHRD_SIT)
2858 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2859 rtnl_unlock();
2860 return err;
2861 }
2862
2863 static int ipv6_mc_config(struct sock *sk, bool join,
2864 const struct in6_addr *addr, int ifindex)
2865 {
2866 int ret;
2867
2868 ASSERT_RTNL();
2869
2870 lock_sock(sk);
2871 if (join)
2872 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2873 else
2874 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2875 release_sock(sk);
2876
2877 return ret;
2878 }
2879
2880 /*
2881 * Manual configuration of address on an interface
2882 */
2883 static int inet6_addr_add(struct net *net, int ifindex,
2884 struct ifa6_config *cfg,
2885 struct netlink_ext_ack *extack)
2886 {
2887 struct inet6_ifaddr *ifp;
2888 struct inet6_dev *idev;
2889 struct net_device *dev;
2890 unsigned long timeout;
2891 clock_t expires;
2892 u32 flags;
2893
2894 ASSERT_RTNL();
2895
2896 if (cfg->plen > 128)
2897 return -EINVAL;
2898
2899 /* check the lifetime */
2900 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2901 return -EINVAL;
2902
2903 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2904 return -EINVAL;
2905
2906 dev = __dev_get_by_index(net, ifindex);
2907 if (!dev)
2908 return -ENODEV;
2909
2910 idev = addrconf_add_dev(dev);
2911 if (IS_ERR(idev))
2912 return PTR_ERR(idev);
2913
2914 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2915 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2916 true, cfg->pfx, ifindex);
2917
2918 if (ret < 0)
2919 return ret;
2920 }
2921
2922 cfg->scope = ipv6_addr_scope(cfg->pfx);
2923
2924 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2925 if (addrconf_finite_timeout(timeout)) {
2926 expires = jiffies_to_clock_t(timeout * HZ);
2927 cfg->valid_lft = timeout;
2928 flags = RTF_EXPIRES;
2929 } else {
2930 expires = 0;
2931 flags = 0;
2932 cfg->ifa_flags |= IFA_F_PERMANENT;
2933 }
2934
2935 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2936 if (addrconf_finite_timeout(timeout)) {
2937 if (timeout == 0)
2938 cfg->ifa_flags |= IFA_F_DEPRECATED;
2939 cfg->preferred_lft = timeout;
2940 }
2941
2942 ifp = ipv6_add_addr(idev, cfg, true, extack);
2943 if (!IS_ERR(ifp)) {
2944 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2945 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2946 ifp->rt_priority, dev, expires,
2947 flags, GFP_KERNEL);
2948 }
2949
2950 /* Send a netlink notification if DAD is enabled and
2951 * optimistic flag is not set
2952 */
2953 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2954 ipv6_ifa_notify(0, ifp);
2955 /*
2956 * Note that section 3.1 of RFC 4429 indicates
2957 * that the Optimistic flag should not be set for
2958 * manually configured addresses
2959 */
2960 addrconf_dad_start(ifp);
2961 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2962 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2963 cfg->preferred_lft, true, jiffies);
2964 in6_ifa_put(ifp);
2965 addrconf_verify_rtnl();
2966 return 0;
2967 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2968 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2969 cfg->pfx, ifindex);
2970 }
2971
2972 return PTR_ERR(ifp);
2973 }
2974
2975 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2976 const struct in6_addr *pfx, unsigned int plen)
2977 {
2978 struct inet6_ifaddr *ifp;
2979 struct inet6_dev *idev;
2980 struct net_device *dev;
2981
2982 if (plen > 128)
2983 return -EINVAL;
2984
2985 dev = __dev_get_by_index(net, ifindex);
2986 if (!dev)
2987 return -ENODEV;
2988
2989 idev = __in6_dev_get(dev);
2990 if (!idev)
2991 return -ENXIO;
2992
2993 read_lock_bh(&idev->lock);
2994 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2995 if (ifp->prefix_len == plen &&
2996 ipv6_addr_equal(pfx, &ifp->addr)) {
2997 in6_ifa_hold(ifp);
2998 read_unlock_bh(&idev->lock);
2999
3000 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3001 (ifa_flags & IFA_F_MANAGETEMPADDR))
3002 manage_tempaddrs(idev, ifp, 0, 0, false,
3003 jiffies);
3004 ipv6_del_addr(ifp);
3005 addrconf_verify_rtnl();
3006 if (ipv6_addr_is_multicast(pfx)) {
3007 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3008 false, pfx, dev->ifindex);
3009 }
3010 return 0;
3011 }
3012 }
3013 read_unlock_bh(&idev->lock);
3014 return -EADDRNOTAVAIL;
3015 }
3016
3017
3018 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3019 {
3020 struct ifa6_config cfg = {
3021 .ifa_flags = IFA_F_PERMANENT,
3022 .preferred_lft = INFINITY_LIFE_TIME,
3023 .valid_lft = INFINITY_LIFE_TIME,
3024 };
3025 struct in6_ifreq ireq;
3026 int err;
3027
3028 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3029 return -EPERM;
3030
3031 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3032 return -EFAULT;
3033
3034 cfg.pfx = &ireq.ifr6_addr;
3035 cfg.plen = ireq.ifr6_prefixlen;
3036
3037 rtnl_lock();
3038 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3039 rtnl_unlock();
3040 return err;
3041 }
3042
3043 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3044 {
3045 struct in6_ifreq ireq;
3046 int err;
3047
3048 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3049 return -EPERM;
3050
3051 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3052 return -EFAULT;
3053
3054 rtnl_lock();
3055 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3056 ireq.ifr6_prefixlen);
3057 rtnl_unlock();
3058 return err;
3059 }
3060
3061 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3062 int plen, int scope)
3063 {
3064 struct inet6_ifaddr *ifp;
3065 struct ifa6_config cfg = {
3066 .pfx = addr,
3067 .plen = plen,
3068 .ifa_flags = IFA_F_PERMANENT,
3069 .valid_lft = INFINITY_LIFE_TIME,
3070 .preferred_lft = INFINITY_LIFE_TIME,
3071 .scope = scope
3072 };
3073
3074 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3075 if (!IS_ERR(ifp)) {
3076 spin_lock_bh(&ifp->lock);
3077 ifp->flags &= ~IFA_F_TENTATIVE;
3078 spin_unlock_bh(&ifp->lock);
3079 rt_genid_bump_ipv6(dev_net(idev->dev));
3080 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3081 in6_ifa_put(ifp);
3082 }
3083 }
3084
3085 #if IS_ENABLED(CONFIG_IPV6_SIT)
3086 static void sit_add_v4_addrs(struct inet6_dev *idev)
3087 {
3088 struct in6_addr addr;
3089 struct net_device *dev;
3090 struct net *net = dev_net(idev->dev);
3091 int scope, plen;
3092 u32 pflags = 0;
3093
3094 ASSERT_RTNL();
3095
3096 memset(&addr, 0, sizeof(struct in6_addr));
3097 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3098
3099 if (idev->dev->flags&IFF_POINTOPOINT) {
3100 addr.s6_addr32[0] = htonl(0xfe800000);
3101 scope = IFA_LINK;
3102 plen = 64;
3103 } else {
3104 scope = IPV6_ADDR_COMPATv4;
3105 plen = 96;
3106 pflags |= RTF_NONEXTHOP;
3107 }
3108
3109 if (addr.s6_addr32[3]) {
3110 add_addr(idev, &addr, plen, scope);
3111 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3112 GFP_KERNEL);
3113 return;
3114 }
3115
3116 for_each_netdev(net, dev) {
3117 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3118 if (in_dev && (dev->flags & IFF_UP)) {
3119 struct in_ifaddr *ifa;
3120 int flag = scope;
3121
3122 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3123 addr.s6_addr32[3] = ifa->ifa_local;
3124
3125 if (ifa->ifa_scope == RT_SCOPE_LINK)
3126 continue;
3127 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3128 if (idev->dev->flags&IFF_POINTOPOINT)
3129 continue;
3130 flag |= IFA_HOST;
3131 }
3132
3133 add_addr(idev, &addr, plen, flag);
3134 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3135 0, pflags, GFP_KERNEL);
3136 }
3137 }
3138 }
3139 }
3140 #endif
3141
3142 static void init_loopback(struct net_device *dev)
3143 {
3144 struct inet6_dev *idev;
3145
3146 /* ::1 */
3147
3148 ASSERT_RTNL();
3149
3150 idev = ipv6_find_idev(dev);
3151 if (IS_ERR(idev)) {
3152 pr_debug("%s: add_dev failed\n", __func__);
3153 return;
3154 }
3155
3156 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3157 }
3158
3159 void addrconf_add_linklocal(struct inet6_dev *idev,
3160 const struct in6_addr *addr, u32 flags)
3161 {
3162 struct ifa6_config cfg = {
3163 .pfx = addr,
3164 .plen = 64,
3165 .ifa_flags = flags | IFA_F_PERMANENT,
3166 .valid_lft = INFINITY_LIFE_TIME,
3167 .preferred_lft = INFINITY_LIFE_TIME,
3168 .scope = IFA_LINK
3169 };
3170 struct inet6_ifaddr *ifp;
3171
3172 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3173 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3174 idev->cnf.optimistic_dad) &&
3175 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3176 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3177 #endif
3178
3179 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3180 if (!IS_ERR(ifp)) {
3181 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3182 0, 0, GFP_ATOMIC);
3183 addrconf_dad_start(ifp);
3184 in6_ifa_put(ifp);
3185 }
3186 }
3187 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3188
3189 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3190 {
3191 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3192 return true;
3193
3194 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3195 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3196 return true;
3197
3198 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3199 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3200 return true;
3201
3202 return false;
3203 }
3204
3205 static int ipv6_generate_stable_address(struct in6_addr *address,
3206 u8 dad_count,
3207 const struct inet6_dev *idev)
3208 {
3209 static DEFINE_SPINLOCK(lock);
3210 static __u32 digest[SHA1_DIGEST_WORDS];
3211 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3212
3213 static union {
3214 char __data[SHA1_BLOCK_SIZE];
3215 struct {
3216 struct in6_addr secret;
3217 __be32 prefix[2];
3218 unsigned char hwaddr[MAX_ADDR_LEN];
3219 u8 dad_count;
3220 } __packed;
3221 } data;
3222
3223 struct in6_addr secret;
3224 struct in6_addr temp;
3225 struct net *net = dev_net(idev->dev);
3226
3227 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3228
3229 if (idev->cnf.stable_secret.initialized)
3230 secret = idev->cnf.stable_secret.secret;
3231 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3232 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3233 else
3234 return -1;
3235
3236 retry:
3237 spin_lock_bh(&lock);
3238
3239 sha1_init(digest);
3240 memset(&data, 0, sizeof(data));
3241 memset(workspace, 0, sizeof(workspace));
3242 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3243 data.prefix[0] = address->s6_addr32[0];
3244 data.prefix[1] = address->s6_addr32[1];
3245 data.secret = secret;
3246 data.dad_count = dad_count;
3247
3248 sha1_transform(digest, data.__data, workspace);
3249
3250 temp = *address;
3251 temp.s6_addr32[2] = (__force __be32)digest[0];
3252 temp.s6_addr32[3] = (__force __be32)digest[1];
3253
3254 spin_unlock_bh(&lock);
3255
3256 if (ipv6_reserved_interfaceid(temp)) {
3257 dad_count++;
3258 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3259 return -1;
3260 goto retry;
3261 }
3262
3263 *address = temp;
3264 return 0;
3265 }
3266
3267 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3268 {
3269 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3270
3271 if (s->initialized)
3272 return;
3273 s = &idev->cnf.stable_secret;
3274 get_random_bytes(&s->secret, sizeof(s->secret));
3275 s->initialized = true;
3276 }
3277
3278 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3279 {
3280 struct in6_addr addr;
3281
3282 /* no link local addresses on L3 master devices */
3283 if (netif_is_l3_master(idev->dev))
3284 return;
3285
3286 /* no link local addresses on devices flagged as slaves */
3287 if (idev->dev->flags & IFF_SLAVE)
3288 return;
3289
3290 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3291
3292 switch (idev->cnf.addr_gen_mode) {
3293 case IN6_ADDR_GEN_MODE_RANDOM:
3294 ipv6_gen_mode_random_init(idev);
3295 fallthrough;
3296 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3297 if (!ipv6_generate_stable_address(&addr, 0, idev))
3298 addrconf_add_linklocal(idev, &addr,
3299 IFA_F_STABLE_PRIVACY);
3300 else if (prefix_route)
3301 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3302 0, 0, GFP_KERNEL);
3303 break;
3304 case IN6_ADDR_GEN_MODE_EUI64:
3305 /* addrconf_add_linklocal also adds a prefix_route and we
3306 * only need to care about prefix routes if ipv6_generate_eui64
3307 * couldn't generate one.
3308 */
3309 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3310 addrconf_add_linklocal(idev, &addr, 0);
3311 else if (prefix_route)
3312 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3313 0, 0, GFP_KERNEL);
3314 break;
3315 case IN6_ADDR_GEN_MODE_NONE:
3316 default:
3317 /* will not add any link local address */
3318 break;
3319 }
3320 }
3321
3322 static void addrconf_dev_config(struct net_device *dev)
3323 {
3324 struct inet6_dev *idev;
3325
3326 ASSERT_RTNL();
3327
3328 if ((dev->type != ARPHRD_ETHER) &&
3329 (dev->type != ARPHRD_FDDI) &&
3330 (dev->type != ARPHRD_ARCNET) &&
3331 (dev->type != ARPHRD_INFINIBAND) &&
3332 (dev->type != ARPHRD_IEEE1394) &&
3333 (dev->type != ARPHRD_TUNNEL6) &&
3334 (dev->type != ARPHRD_6LOWPAN) &&
3335 (dev->type != ARPHRD_IP6GRE) &&
3336 (dev->type != ARPHRD_IPGRE) &&
3337 (dev->type != ARPHRD_TUNNEL) &&
3338 (dev->type != ARPHRD_NONE) &&
3339 (dev->type != ARPHRD_RAWIP)) {
3340 /* Alas, we support only Ethernet autoconfiguration. */
3341 idev = __in6_dev_get(dev);
3342 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3343 dev->flags & IFF_MULTICAST)
3344 ipv6_mc_up(idev);
3345 return;
3346 }
3347
3348 idev = addrconf_add_dev(dev);
3349 if (IS_ERR(idev))
3350 return;
3351
3352 /* this device type has no EUI support */
3353 if (dev->type == ARPHRD_NONE &&
3354 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3355 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3356
3357 addrconf_addr_gen(idev, false);
3358 }
3359
3360 #if IS_ENABLED(CONFIG_IPV6_SIT)
3361 static void addrconf_sit_config(struct net_device *dev)
3362 {
3363 struct inet6_dev *idev;
3364
3365 ASSERT_RTNL();
3366
3367 /*
3368 * Configure the tunnel with one of our IPv4
3369 * addresses... we should configure all of
3370 * our v4 addrs in the tunnel
3371 */
3372
3373 idev = ipv6_find_idev(dev);
3374 if (IS_ERR(idev)) {
3375 pr_debug("%s: add_dev failed\n", __func__);
3376 return;
3377 }
3378
3379 if (dev->priv_flags & IFF_ISATAP) {
3380 addrconf_addr_gen(idev, false);
3381 return;
3382 }
3383
3384 sit_add_v4_addrs(idev);
3385
3386 if (dev->flags&IFF_POINTOPOINT)
3387 addrconf_add_mroute(dev);
3388 }
3389 #endif
3390
3391 #if IS_ENABLED(CONFIG_NET_IPGRE)
3392 static void addrconf_gre_config(struct net_device *dev)
3393 {
3394 struct inet6_dev *idev;
3395
3396 ASSERT_RTNL();
3397
3398 idev = ipv6_find_idev(dev);
3399 if (IS_ERR(idev)) {
3400 pr_debug("%s: add_dev failed\n", __func__);
3401 return;
3402 }
3403
3404 addrconf_addr_gen(idev, true);
3405 if (dev->flags & IFF_POINTOPOINT)
3406 addrconf_add_mroute(dev);
3407 }
3408 #endif
3409
3410 static int fixup_permanent_addr(struct net *net,
3411 struct inet6_dev *idev,
3412 struct inet6_ifaddr *ifp)
3413 {
3414 /* !fib6_node means the host route was removed from the
3415 * FIB, for example, if 'lo' device is taken down. In that
3416 * case regenerate the host route.
3417 */
3418 if (!ifp->rt || !ifp->rt->fib6_node) {
3419 struct fib6_info *f6i, *prev;
3420
3421 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3422 GFP_ATOMIC);
3423 if (IS_ERR(f6i))
3424 return PTR_ERR(f6i);
3425
3426 /* ifp->rt can be accessed outside of rtnl */
3427 spin_lock(&ifp->lock);
3428 prev = ifp->rt;
3429 ifp->rt = f6i;
3430 spin_unlock(&ifp->lock);
3431
3432 fib6_info_release(prev);
3433 }
3434
3435 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3436 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3437 ifp->rt_priority, idev->dev, 0, 0,
3438 GFP_ATOMIC);
3439 }
3440
3441 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3442 addrconf_dad_start(ifp);
3443
3444 return 0;
3445 }
3446
3447 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3448 {
3449 struct inet6_ifaddr *ifp, *tmp;
3450 struct inet6_dev *idev;
3451
3452 idev = __in6_dev_get(dev);
3453 if (!idev)
3454 return;
3455
3456 write_lock_bh(&idev->lock);
3457
3458 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3459 if ((ifp->flags & IFA_F_PERMANENT) &&
3460 fixup_permanent_addr(net, idev, ifp) < 0) {
3461 write_unlock_bh(&idev->lock);
3462 in6_ifa_hold(ifp);
3463 ipv6_del_addr(ifp);
3464 write_lock_bh(&idev->lock);
3465
3466 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3467 idev->dev->name, &ifp->addr);
3468 }
3469 }
3470
3471 write_unlock_bh(&idev->lock);
3472 }
3473
3474 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3475 void *ptr)
3476 {
3477 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3478 struct netdev_notifier_change_info *change_info;
3479 struct netdev_notifier_changeupper_info *info;
3480 struct inet6_dev *idev = __in6_dev_get(dev);
3481 struct net *net = dev_net(dev);
3482 int run_pending = 0;
3483 int err;
3484
3485 switch (event) {
3486 case NETDEV_REGISTER:
3487 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3488 idev = ipv6_add_dev(dev);
3489 if (IS_ERR(idev))
3490 return notifier_from_errno(PTR_ERR(idev));
3491 }
3492 break;
3493
3494 case NETDEV_CHANGEMTU:
3495 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3496 if (dev->mtu < IPV6_MIN_MTU) {
3497 addrconf_ifdown(dev, dev != net->loopback_dev);
3498 break;
3499 }
3500
3501 if (idev) {
3502 rt6_mtu_change(dev, dev->mtu);
3503 idev->cnf.mtu6 = dev->mtu;
3504 break;
3505 }
3506
3507 /* allocate new idev */
3508 idev = ipv6_add_dev(dev);
3509 if (IS_ERR(idev))
3510 break;
3511
3512 /* device is still not ready */
3513 if (!(idev->if_flags & IF_READY))
3514 break;
3515
3516 run_pending = 1;
3517 fallthrough;
3518 case NETDEV_UP:
3519 case NETDEV_CHANGE:
3520 if (dev->flags & IFF_SLAVE)
3521 break;
3522
3523 if (idev && idev->cnf.disable_ipv6)
3524 break;
3525
3526 if (event == NETDEV_UP) {
3527 /* restore routes for permanent addresses */
3528 addrconf_permanent_addr(net, dev);
3529
3530 if (!addrconf_link_ready(dev)) {
3531 /* device is not ready yet. */
3532 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3533 dev->name);
3534 break;
3535 }
3536
3537 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3538 idev = ipv6_add_dev(dev);
3539
3540 if (!IS_ERR_OR_NULL(idev)) {
3541 idev->if_flags |= IF_READY;
3542 run_pending = 1;
3543 }
3544 } else if (event == NETDEV_CHANGE) {
3545 if (!addrconf_link_ready(dev)) {
3546 /* device is still not ready. */
3547 rt6_sync_down_dev(dev, event);
3548 break;
3549 }
3550
3551 if (!IS_ERR_OR_NULL(idev)) {
3552 if (idev->if_flags & IF_READY) {
3553 /* device is already configured -
3554 * but resend MLD reports, we might
3555 * have roamed and need to update
3556 * multicast snooping switches
3557 */
3558 ipv6_mc_up(idev);
3559 change_info = ptr;
3560 if (change_info->flags_changed & IFF_NOARP)
3561 addrconf_dad_run(idev, true);
3562 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3563 break;
3564 }
3565 idev->if_flags |= IF_READY;
3566 }
3567
3568 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3569 dev->name);
3570
3571 run_pending = 1;
3572 }
3573
3574 switch (dev->type) {
3575 #if IS_ENABLED(CONFIG_IPV6_SIT)
3576 case ARPHRD_SIT:
3577 addrconf_sit_config(dev);
3578 break;
3579 #endif
3580 #if IS_ENABLED(CONFIG_NET_IPGRE)
3581 case ARPHRD_IPGRE:
3582 addrconf_gre_config(dev);
3583 break;
3584 #endif
3585 case ARPHRD_LOOPBACK:
3586 init_loopback(dev);
3587 break;
3588
3589 default:
3590 addrconf_dev_config(dev);
3591 break;
3592 }
3593
3594 if (!IS_ERR_OR_NULL(idev)) {
3595 if (run_pending)
3596 addrconf_dad_run(idev, false);
3597
3598 /* Device has an address by now */
3599 rt6_sync_up(dev, RTNH_F_DEAD);
3600
3601 /*
3602 * If the MTU changed during the interface down,
3603 * when the interface up, the changed MTU must be
3604 * reflected in the idev as well as routers.
3605 */
3606 if (idev->cnf.mtu6 != dev->mtu &&
3607 dev->mtu >= IPV6_MIN_MTU) {
3608 rt6_mtu_change(dev, dev->mtu);
3609 idev->cnf.mtu6 = dev->mtu;
3610 }
3611 idev->tstamp = jiffies;
3612 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3613
3614 /*
3615 * If the changed mtu during down is lower than
3616 * IPV6_MIN_MTU stop IPv6 on this interface.
3617 */
3618 if (dev->mtu < IPV6_MIN_MTU)
3619 addrconf_ifdown(dev, dev != net->loopback_dev);
3620 }
3621 break;
3622
3623 case NETDEV_DOWN:
3624 case NETDEV_UNREGISTER:
3625 /*
3626 * Remove all addresses from this interface.
3627 */
3628 addrconf_ifdown(dev, event != NETDEV_DOWN);
3629 break;
3630
3631 case NETDEV_CHANGENAME:
3632 if (idev) {
3633 snmp6_unregister_dev(idev);
3634 addrconf_sysctl_unregister(idev);
3635 err = addrconf_sysctl_register(idev);
3636 if (err)
3637 return notifier_from_errno(err);
3638 err = snmp6_register_dev(idev);
3639 if (err) {
3640 addrconf_sysctl_unregister(idev);
3641 return notifier_from_errno(err);
3642 }
3643 }
3644 break;
3645
3646 case NETDEV_PRE_TYPE_CHANGE:
3647 case NETDEV_POST_TYPE_CHANGE:
3648 if (idev)
3649 addrconf_type_change(dev, event);
3650 break;
3651
3652 case NETDEV_CHANGEUPPER:
3653 info = ptr;
3654
3655 /* flush all routes if dev is linked to or unlinked from
3656 * an L3 master device (e.g., VRF)
3657 */
3658 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3659 addrconf_ifdown(dev, false);
3660 }
3661
3662 return NOTIFY_OK;
3663 }
3664
3665 /*
3666 * addrconf module should be notified of a device going up
3667 */
3668 static struct notifier_block ipv6_dev_notf = {
3669 .notifier_call = addrconf_notify,
3670 .priority = ADDRCONF_NOTIFY_PRIORITY,
3671 };
3672
3673 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3674 {
3675 struct inet6_dev *idev;
3676 ASSERT_RTNL();
3677
3678 idev = __in6_dev_get(dev);
3679
3680 if (event == NETDEV_POST_TYPE_CHANGE)
3681 ipv6_mc_remap(idev);
3682 else if (event == NETDEV_PRE_TYPE_CHANGE)
3683 ipv6_mc_unmap(idev);
3684 }
3685
3686 static bool addr_is_local(const struct in6_addr *addr)
3687 {
3688 return ipv6_addr_type(addr) &
3689 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3690 }
3691
3692 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3693 {
3694 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3695 struct net *net = dev_net(dev);
3696 struct inet6_dev *idev;
3697 struct inet6_ifaddr *ifa, *tmp;
3698 bool keep_addr = false;
3699 int state, i;
3700
3701 ASSERT_RTNL();
3702
3703 rt6_disable_ip(dev, event);
3704
3705 idev = __in6_dev_get(dev);
3706 if (!idev)
3707 return -ENODEV;
3708
3709 /*
3710 * Step 1: remove reference to ipv6 device from parent device.
3711 * Do not dev_put!
3712 */
3713 if (unregister) {
3714 idev->dead = 1;
3715
3716 /* protected by rtnl_lock */
3717 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3718
3719 /* Step 1.5: remove snmp6 entry */
3720 snmp6_unregister_dev(idev);
3721
3722 }
3723
3724 /* combine the user config with event to determine if permanent
3725 * addresses are to be removed from address hash table
3726 */
3727 if (!unregister && !idev->cnf.disable_ipv6) {
3728 /* aggregate the system setting and interface setting */
3729 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3730
3731 if (!_keep_addr)
3732 _keep_addr = idev->cnf.keep_addr_on_down;
3733
3734 keep_addr = (_keep_addr > 0);
3735 }
3736
3737 /* Step 2: clear hash table */
3738 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3739 struct hlist_head *h = &inet6_addr_lst[i];
3740
3741 spin_lock_bh(&addrconf_hash_lock);
3742 restart:
3743 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3744 if (ifa->idev == idev) {
3745 addrconf_del_dad_work(ifa);
3746 /* combined flag + permanent flag decide if
3747 * address is retained on a down event
3748 */
3749 if (!keep_addr ||
3750 !(ifa->flags & IFA_F_PERMANENT) ||
3751 addr_is_local(&ifa->addr)) {
3752 hlist_del_init_rcu(&ifa->addr_lst);
3753 goto restart;
3754 }
3755 }
3756 }
3757 spin_unlock_bh(&addrconf_hash_lock);
3758 }
3759
3760 write_lock_bh(&idev->lock);
3761
3762 addrconf_del_rs_timer(idev);
3763
3764 /* Step 2: clear flags for stateless addrconf */
3765 if (!unregister)
3766 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3767
3768 /* Step 3: clear tempaddr list */
3769 while (!list_empty(&idev->tempaddr_list)) {
3770 ifa = list_first_entry(&idev->tempaddr_list,
3771 struct inet6_ifaddr, tmp_list);
3772 list_del(&ifa->tmp_list);
3773 write_unlock_bh(&idev->lock);
3774 spin_lock_bh(&ifa->lock);
3775
3776 if (ifa->ifpub) {
3777 in6_ifa_put(ifa->ifpub);
3778 ifa->ifpub = NULL;
3779 }
3780 spin_unlock_bh(&ifa->lock);
3781 in6_ifa_put(ifa);
3782 write_lock_bh(&idev->lock);
3783 }
3784
3785 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3786 struct fib6_info *rt = NULL;
3787 bool keep;
3788
3789 addrconf_del_dad_work(ifa);
3790
3791 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3792 !addr_is_local(&ifa->addr);
3793
3794 write_unlock_bh(&idev->lock);
3795 spin_lock_bh(&ifa->lock);
3796
3797 if (keep) {
3798 /* set state to skip the notifier below */
3799 state = INET6_IFADDR_STATE_DEAD;
3800 ifa->state = INET6_IFADDR_STATE_PREDAD;
3801 if (!(ifa->flags & IFA_F_NODAD))
3802 ifa->flags |= IFA_F_TENTATIVE;
3803
3804 rt = ifa->rt;
3805 ifa->rt = NULL;
3806 } else {
3807 state = ifa->state;
3808 ifa->state = INET6_IFADDR_STATE_DEAD;
3809 }
3810
3811 spin_unlock_bh(&ifa->lock);
3812
3813 if (rt)
3814 ip6_del_rt(net, rt, false);
3815
3816 if (state != INET6_IFADDR_STATE_DEAD) {
3817 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3818 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3819 } else {
3820 if (idev->cnf.forwarding)
3821 addrconf_leave_anycast(ifa);
3822 addrconf_leave_solict(ifa->idev, &ifa->addr);
3823 }
3824
3825 write_lock_bh(&idev->lock);
3826 if (!keep) {
3827 list_del_rcu(&ifa->if_list);
3828 in6_ifa_put(ifa);
3829 }
3830 }
3831
3832 write_unlock_bh(&idev->lock);
3833
3834 /* Step 5: Discard anycast and multicast list */
3835 if (unregister) {
3836 ipv6_ac_destroy_dev(idev);
3837 ipv6_mc_destroy_dev(idev);
3838 } else {
3839 ipv6_mc_down(idev);
3840 }
3841
3842 idev->tstamp = jiffies;
3843
3844 /* Last: Shot the device (if unregistered) */
3845 if (unregister) {
3846 addrconf_sysctl_unregister(idev);
3847 neigh_parms_release(&nd_tbl, idev->nd_parms);
3848 neigh_ifdown(&nd_tbl, dev);
3849 in6_dev_put(idev);
3850 }
3851 return 0;
3852 }
3853
3854 static void addrconf_rs_timer(struct timer_list *t)
3855 {
3856 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3857 struct net_device *dev = idev->dev;
3858 struct in6_addr lladdr;
3859
3860 write_lock(&idev->lock);
3861 if (idev->dead || !(idev->if_flags & IF_READY))
3862 goto out;
3863
3864 if (!ipv6_accept_ra(idev))
3865 goto out;
3866
3867 /* Announcement received after solicitation was sent */
3868 if (idev->if_flags & IF_RA_RCVD)
3869 goto out;
3870
3871 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3872 write_unlock(&idev->lock);
3873 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3874 ndisc_send_rs(dev, &lladdr,
3875 &in6addr_linklocal_allrouters);
3876 else
3877 goto put;
3878
3879 write_lock(&idev->lock);
3880 idev->rs_interval = rfc3315_s14_backoff_update(
3881 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3882 /* The wait after the last probe can be shorter */
3883 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3884 idev->cnf.rtr_solicits) ?
3885 idev->cnf.rtr_solicit_delay :
3886 idev->rs_interval);
3887 } else {
3888 /*
3889 * Note: we do not support deprecated "all on-link"
3890 * assumption any longer.
3891 */
3892 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3893 }
3894
3895 out:
3896 write_unlock(&idev->lock);
3897 put:
3898 in6_dev_put(idev);
3899 }
3900
3901 /*
3902 * Duplicate Address Detection
3903 */
3904 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3905 {
3906 unsigned long rand_num;
3907 struct inet6_dev *idev = ifp->idev;
3908 u64 nonce;
3909
3910 if (ifp->flags & IFA_F_OPTIMISTIC)
3911 rand_num = 0;
3912 else
3913 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3914
3915 nonce = 0;
3916 if (idev->cnf.enhanced_dad ||
3917 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3918 do
3919 get_random_bytes(&nonce, 6);
3920 while (nonce == 0);
3921 }
3922 ifp->dad_nonce = nonce;
3923 ifp->dad_probes = idev->cnf.dad_transmits;
3924 addrconf_mod_dad_work(ifp, rand_num);
3925 }
3926
3927 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3928 {
3929 struct inet6_dev *idev = ifp->idev;
3930 struct net_device *dev = idev->dev;
3931 bool bump_id, notify = false;
3932 struct net *net;
3933
3934 addrconf_join_solict(dev, &ifp->addr);
3935
3936 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3937
3938 read_lock_bh(&idev->lock);
3939 spin_lock(&ifp->lock);
3940 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3941 goto out;
3942
3943 net = dev_net(dev);
3944 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3945 (net->ipv6.devconf_all->accept_dad < 1 &&
3946 idev->cnf.accept_dad < 1) ||
3947 !(ifp->flags&IFA_F_TENTATIVE) ||
3948 ifp->flags & IFA_F_NODAD) {
3949 bool send_na = false;
3950
3951 if (ifp->flags & IFA_F_TENTATIVE &&
3952 !(ifp->flags & IFA_F_OPTIMISTIC))
3953 send_na = true;
3954 bump_id = ifp->flags & IFA_F_TENTATIVE;
3955 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3956 spin_unlock(&ifp->lock);
3957 read_unlock_bh(&idev->lock);
3958
3959 addrconf_dad_completed(ifp, bump_id, send_na);
3960 return;
3961 }
3962
3963 if (!(idev->if_flags & IF_READY)) {
3964 spin_unlock(&ifp->lock);
3965 read_unlock_bh(&idev->lock);
3966 /*
3967 * If the device is not ready:
3968 * - keep it tentative if it is a permanent address.
3969 * - otherwise, kill it.
3970 */
3971 in6_ifa_hold(ifp);
3972 addrconf_dad_stop(ifp, 0);
3973 return;
3974 }
3975
3976 /*
3977 * Optimistic nodes can start receiving
3978 * Frames right away
3979 */
3980 if (ifp->flags & IFA_F_OPTIMISTIC) {
3981 ip6_ins_rt(net, ifp->rt);
3982 if (ipv6_use_optimistic_addr(net, idev)) {
3983 /* Because optimistic nodes can use this address,
3984 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3985 */
3986 notify = true;
3987 }
3988 }
3989
3990 addrconf_dad_kick(ifp);
3991 out:
3992 spin_unlock(&ifp->lock);
3993 read_unlock_bh(&idev->lock);
3994 if (notify)
3995 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3996 }
3997
3998 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3999 {
4000 bool begin_dad = false;
4001
4002 spin_lock_bh(&ifp->lock);
4003 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4004 ifp->state = INET6_IFADDR_STATE_PREDAD;
4005 begin_dad = true;
4006 }
4007 spin_unlock_bh(&ifp->lock);
4008
4009 if (begin_dad)
4010 addrconf_mod_dad_work(ifp, 0);
4011 }
4012
4013 static void addrconf_dad_work(struct work_struct *w)
4014 {
4015 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4016 struct inet6_ifaddr,
4017 dad_work);
4018 struct inet6_dev *idev = ifp->idev;
4019 bool bump_id, disable_ipv6 = false;
4020 struct in6_addr mcaddr;
4021
4022 enum {
4023 DAD_PROCESS,
4024 DAD_BEGIN,
4025 DAD_ABORT,
4026 } action = DAD_PROCESS;
4027
4028 rtnl_lock();
4029
4030 spin_lock_bh(&ifp->lock);
4031 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4032 action = DAD_BEGIN;
4033 ifp->state = INET6_IFADDR_STATE_DAD;
4034 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4035 action = DAD_ABORT;
4036 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4037
4038 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4039 idev->cnf.accept_dad > 1) &&
4040 !idev->cnf.disable_ipv6 &&
4041 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4042 struct in6_addr addr;
4043
4044 addr.s6_addr32[0] = htonl(0xfe800000);
4045 addr.s6_addr32[1] = 0;
4046
4047 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4048 ipv6_addr_equal(&ifp->addr, &addr)) {
4049 /* DAD failed for link-local based on MAC */
4050 idev->cnf.disable_ipv6 = 1;
4051
4052 pr_info("%s: IPv6 being disabled!\n",
4053 ifp->idev->dev->name);
4054 disable_ipv6 = true;
4055 }
4056 }
4057 }
4058 spin_unlock_bh(&ifp->lock);
4059
4060 if (action == DAD_BEGIN) {
4061 addrconf_dad_begin(ifp);
4062 goto out;
4063 } else if (action == DAD_ABORT) {
4064 in6_ifa_hold(ifp);
4065 addrconf_dad_stop(ifp, 1);
4066 if (disable_ipv6)
4067 addrconf_ifdown(idev->dev, false);
4068 goto out;
4069 }
4070
4071 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4072 goto out;
4073
4074 write_lock_bh(&idev->lock);
4075 if (idev->dead || !(idev->if_flags & IF_READY)) {
4076 write_unlock_bh(&idev->lock);
4077 goto out;
4078 }
4079
4080 spin_lock(&ifp->lock);
4081 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4082 spin_unlock(&ifp->lock);
4083 write_unlock_bh(&idev->lock);
4084 goto out;
4085 }
4086
4087 if (ifp->dad_probes == 0) {
4088 bool send_na = false;
4089
4090 /*
4091 * DAD was successful
4092 */
4093
4094 if (ifp->flags & IFA_F_TENTATIVE &&
4095 !(ifp->flags & IFA_F_OPTIMISTIC))
4096 send_na = true;
4097 bump_id = ifp->flags & IFA_F_TENTATIVE;
4098 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4099 spin_unlock(&ifp->lock);
4100 write_unlock_bh(&idev->lock);
4101
4102 addrconf_dad_completed(ifp, bump_id, send_na);
4103
4104 goto out;
4105 }
4106
4107 ifp->dad_probes--;
4108 addrconf_mod_dad_work(ifp,
4109 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4110 HZ/100));
4111 spin_unlock(&ifp->lock);
4112 write_unlock_bh(&idev->lock);
4113
4114 /* send a neighbour solicitation for our addr */
4115 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4116 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4117 ifp->dad_nonce);
4118 out:
4119 in6_ifa_put(ifp);
4120 rtnl_unlock();
4121 }
4122
4123 /* ifp->idev must be at least read locked */
4124 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4125 {
4126 struct inet6_ifaddr *ifpiter;
4127 struct inet6_dev *idev = ifp->idev;
4128
4129 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4130 if (ifpiter->scope > IFA_LINK)
4131 break;
4132 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4133 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4134 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4135 IFA_F_PERMANENT)
4136 return false;
4137 }
4138 return true;
4139 }
4140
4141 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4142 bool send_na)
4143 {
4144 struct net_device *dev = ifp->idev->dev;
4145 struct in6_addr lladdr;
4146 bool send_rs, send_mld;
4147
4148 addrconf_del_dad_work(ifp);
4149
4150 /*
4151 * Configure the address for reception. Now it is valid.
4152 */
4153
4154 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4155
4156 /* If added prefix is link local and we are prepared to process
4157 router advertisements, start sending router solicitations.
4158 */
4159
4160 read_lock_bh(&ifp->idev->lock);
4161 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4162 send_rs = send_mld &&
4163 ipv6_accept_ra(ifp->idev) &&
4164 ifp->idev->cnf.rtr_solicits != 0 &&
4165 (dev->flags&IFF_LOOPBACK) == 0;
4166 read_unlock_bh(&ifp->idev->lock);
4167
4168 /* While dad is in progress mld report's source address is in6_addrany.
4169 * Resend with proper ll now.
4170 */
4171 if (send_mld)
4172 ipv6_mc_dad_complete(ifp->idev);
4173
4174 /* send unsolicited NA if enabled */
4175 if (send_na &&
4176 (ifp->idev->cnf.ndisc_notify ||
4177 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4178 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4179 /*router=*/ !!ifp->idev->cnf.forwarding,
4180 /*solicited=*/ false, /*override=*/ true,
4181 /*inc_opt=*/ true);
4182 }
4183
4184 if (send_rs) {
4185 /*
4186 * If a host as already performed a random delay
4187 * [...] as part of DAD [...] there is no need
4188 * to delay again before sending the first RS
4189 */
4190 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4191 return;
4192 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4193
4194 write_lock_bh(&ifp->idev->lock);
4195 spin_lock(&ifp->lock);
4196 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4197 ifp->idev->cnf.rtr_solicit_interval);
4198 ifp->idev->rs_probes = 1;
4199 ifp->idev->if_flags |= IF_RS_SENT;
4200 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4201 spin_unlock(&ifp->lock);
4202 write_unlock_bh(&ifp->idev->lock);
4203 }
4204
4205 if (bump_id)
4206 rt_genid_bump_ipv6(dev_net(dev));
4207
4208 /* Make sure that a new temporary address will be created
4209 * before this temporary address becomes deprecated.
4210 */
4211 if (ifp->flags & IFA_F_TEMPORARY)
4212 addrconf_verify_rtnl();
4213 }
4214
4215 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4216 {
4217 struct inet6_ifaddr *ifp;
4218
4219 read_lock_bh(&idev->lock);
4220 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4221 spin_lock(&ifp->lock);
4222 if ((ifp->flags & IFA_F_TENTATIVE &&
4223 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4224 if (restart)
4225 ifp->state = INET6_IFADDR_STATE_PREDAD;
4226 addrconf_dad_kick(ifp);
4227 }
4228 spin_unlock(&ifp->lock);
4229 }
4230 read_unlock_bh(&idev->lock);
4231 }
4232
4233 #ifdef CONFIG_PROC_FS
4234 struct if6_iter_state {
4235 struct seq_net_private p;
4236 int bucket;
4237 int offset;
4238 };
4239
4240 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4241 {
4242 struct if6_iter_state *state = seq->private;
4243 struct net *net = seq_file_net(seq);
4244 struct inet6_ifaddr *ifa = NULL;
4245 int p = 0;
4246
4247 /* initial bucket if pos is 0 */
4248 if (pos == 0) {
4249 state->bucket = 0;
4250 state->offset = 0;
4251 }
4252
4253 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4254 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4255 addr_lst) {
4256 if (!net_eq(dev_net(ifa->idev->dev), net))
4257 continue;
4258 /* sync with offset */
4259 if (p < state->offset) {
4260 p++;
4261 continue;
4262 }
4263 return ifa;
4264 }
4265
4266 /* prepare for next bucket */
4267 state->offset = 0;
4268 p = 0;
4269 }
4270 return NULL;
4271 }
4272
4273 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4274 struct inet6_ifaddr *ifa)
4275 {
4276 struct if6_iter_state *state = seq->private;
4277 struct net *net = seq_file_net(seq);
4278
4279 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4280 if (!net_eq(dev_net(ifa->idev->dev), net))
4281 continue;
4282 state->offset++;
4283 return ifa;
4284 }
4285
4286 state->offset = 0;
4287 while (++state->bucket < IN6_ADDR_HSIZE) {
4288 hlist_for_each_entry_rcu(ifa,
4289 &inet6_addr_lst[state->bucket], addr_lst) {
4290 if (!net_eq(dev_net(ifa->idev->dev), net))
4291 continue;
4292 return ifa;
4293 }
4294 }
4295
4296 return NULL;
4297 }
4298
4299 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4300 __acquires(rcu)
4301 {
4302 rcu_read_lock();
4303 return if6_get_first(seq, *pos);
4304 }
4305
4306 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4307 {
4308 struct inet6_ifaddr *ifa;
4309
4310 ifa = if6_get_next(seq, v);
4311 ++*pos;
4312 return ifa;
4313 }
4314
4315 static void if6_seq_stop(struct seq_file *seq, void *v)
4316 __releases(rcu)
4317 {
4318 rcu_read_unlock();
4319 }
4320
4321 static int if6_seq_show(struct seq_file *seq, void *v)
4322 {
4323 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4324 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4325 &ifp->addr,
4326 ifp->idev->dev->ifindex,
4327 ifp->prefix_len,
4328 ifp->scope,
4329 (u8) ifp->flags,
4330 ifp->idev->dev->name);
4331 return 0;
4332 }
4333
4334 static const struct seq_operations if6_seq_ops = {
4335 .start = if6_seq_start,
4336 .next = if6_seq_next,
4337 .show = if6_seq_show,
4338 .stop = if6_seq_stop,
4339 };
4340
4341 static int __net_init if6_proc_net_init(struct net *net)
4342 {
4343 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4344 sizeof(struct if6_iter_state)))
4345 return -ENOMEM;
4346 return 0;
4347 }
4348
4349 static void __net_exit if6_proc_net_exit(struct net *net)
4350 {
4351 remove_proc_entry("if_inet6", net->proc_net);
4352 }
4353
4354 static struct pernet_operations if6_proc_net_ops = {
4355 .init = if6_proc_net_init,
4356 .exit = if6_proc_net_exit,
4357 };
4358
4359 int __init if6_proc_init(void)
4360 {
4361 return register_pernet_subsys(&if6_proc_net_ops);
4362 }
4363
4364 void if6_proc_exit(void)
4365 {
4366 unregister_pernet_subsys(&if6_proc_net_ops);
4367 }
4368 #endif /* CONFIG_PROC_FS */
4369
4370 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4371 /* Check if address is a home address configured on any interface. */
4372 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4373 {
4374 unsigned int hash = inet6_addr_hash(net, addr);
4375 struct inet6_ifaddr *ifp = NULL;
4376 int ret = 0;
4377
4378 rcu_read_lock();
4379 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4380 if (!net_eq(dev_net(ifp->idev->dev), net))
4381 continue;
4382 if (ipv6_addr_equal(&ifp->addr, addr) &&
4383 (ifp->flags & IFA_F_HOMEADDRESS)) {
4384 ret = 1;
4385 break;
4386 }
4387 }
4388 rcu_read_unlock();
4389 return ret;
4390 }
4391 #endif
4392
4393 /* RFC6554 has some algorithm to avoid loops in segment routing by
4394 * checking if the segments contains any of a local interface address.
4395 *
4396 * Quote:
4397 *
4398 * To detect loops in the SRH, a router MUST determine if the SRH
4399 * includes multiple addresses assigned to any interface on that router.
4400 * If such addresses appear more than once and are separated by at least
4401 * one address not assigned to that router.
4402 */
4403 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4404 unsigned char nsegs)
4405 {
4406 const struct in6_addr *addr;
4407 int i, ret = 0, found = 0;
4408 struct inet6_ifaddr *ifp;
4409 bool separated = false;
4410 unsigned int hash;
4411 bool hash_found;
4412
4413 rcu_read_lock();
4414 for (i = 0; i < nsegs; i++) {
4415 addr = &segs[i];
4416 hash = inet6_addr_hash(net, addr);
4417
4418 hash_found = false;
4419 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4420 if (!net_eq(dev_net(ifp->idev->dev), net))
4421 continue;
4422
4423 if (ipv6_addr_equal(&ifp->addr, addr)) {
4424 hash_found = true;
4425 break;
4426 }
4427 }
4428
4429 if (hash_found) {
4430 if (found > 1 && separated) {
4431 ret = 1;
4432 break;
4433 }
4434
4435 separated = false;
4436 found++;
4437 } else {
4438 separated = true;
4439 }
4440 }
4441 rcu_read_unlock();
4442
4443 return ret;
4444 }
4445
4446 /*
4447 * Periodic address status verification
4448 */
4449
4450 static void addrconf_verify_rtnl(void)
4451 {
4452 unsigned long now, next, next_sec, next_sched;
4453 struct inet6_ifaddr *ifp;
4454 int i;
4455
4456 ASSERT_RTNL();
4457
4458 rcu_read_lock_bh();
4459 now = jiffies;
4460 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4461
4462 cancel_delayed_work(&addr_chk_work);
4463
4464 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4465 restart:
4466 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4467 unsigned long age;
4468
4469 /* When setting preferred_lft to a value not zero or
4470 * infinity, while valid_lft is infinity
4471 * IFA_F_PERMANENT has a non-infinity life time.
4472 */
4473 if ((ifp->flags & IFA_F_PERMANENT) &&
4474 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4475 continue;
4476
4477 spin_lock(&ifp->lock);
4478 /* We try to batch several events at once. */
4479 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4480
4481 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4482 age >= ifp->valid_lft) {
4483 spin_unlock(&ifp->lock);
4484 in6_ifa_hold(ifp);
4485 ipv6_del_addr(ifp);
4486 goto restart;
4487 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4488 spin_unlock(&ifp->lock);
4489 continue;
4490 } else if (age >= ifp->prefered_lft) {
4491 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4492 int deprecate = 0;
4493
4494 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4495 deprecate = 1;
4496 ifp->flags |= IFA_F_DEPRECATED;
4497 }
4498
4499 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4500 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4501 next = ifp->tstamp + ifp->valid_lft * HZ;
4502
4503 spin_unlock(&ifp->lock);
4504
4505 if (deprecate) {
4506 in6_ifa_hold(ifp);
4507
4508 ipv6_ifa_notify(0, ifp);
4509 in6_ifa_put(ifp);
4510 goto restart;
4511 }
4512 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4513 !(ifp->flags&IFA_F_TENTATIVE)) {
4514 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4515 ifp->idev->cnf.dad_transmits *
4516 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4517
4518 if (age >= ifp->prefered_lft - regen_advance) {
4519 struct inet6_ifaddr *ifpub = ifp->ifpub;
4520 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4521 next = ifp->tstamp + ifp->prefered_lft * HZ;
4522 if (!ifp->regen_count && ifpub) {
4523 ifp->regen_count++;
4524 in6_ifa_hold(ifp);
4525 in6_ifa_hold(ifpub);
4526 spin_unlock(&ifp->lock);
4527
4528 spin_lock(&ifpub->lock);
4529 ifpub->regen_count = 0;
4530 spin_unlock(&ifpub->lock);
4531 rcu_read_unlock_bh();
4532 ipv6_create_tempaddr(ifpub, true);
4533 in6_ifa_put(ifpub);
4534 in6_ifa_put(ifp);
4535 rcu_read_lock_bh();
4536 goto restart;
4537 }
4538 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4539 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4540 spin_unlock(&ifp->lock);
4541 } else {
4542 /* ifp->prefered_lft <= ifp->valid_lft */
4543 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4544 next = ifp->tstamp + ifp->prefered_lft * HZ;
4545 spin_unlock(&ifp->lock);
4546 }
4547 }
4548 }
4549
4550 next_sec = round_jiffies_up(next);
4551 next_sched = next;
4552
4553 /* If rounded timeout is accurate enough, accept it. */
4554 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4555 next_sched = next_sec;
4556
4557 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4558 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4559 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4560
4561 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4562 now, next, next_sec, next_sched);
4563 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4564 rcu_read_unlock_bh();
4565 }
4566
4567 static void addrconf_verify_work(struct work_struct *w)
4568 {
4569 rtnl_lock();
4570 addrconf_verify_rtnl();
4571 rtnl_unlock();
4572 }
4573
4574 static void addrconf_verify(void)
4575 {
4576 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4577 }
4578
4579 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4580 struct in6_addr **peer_pfx)
4581 {
4582 struct in6_addr *pfx = NULL;
4583
4584 *peer_pfx = NULL;
4585
4586 if (addr)
4587 pfx = nla_data(addr);
4588
4589 if (local) {
4590 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4591 *peer_pfx = pfx;
4592 pfx = nla_data(local);
4593 }
4594
4595 return pfx;
4596 }
4597
4598 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4599 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4600 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4601 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4602 [IFA_FLAGS] = { .len = sizeof(u32) },
4603 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4604 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4605 };
4606
4607 static int
4608 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4609 struct netlink_ext_ack *extack)
4610 {
4611 struct net *net = sock_net(skb->sk);
4612 struct ifaddrmsg *ifm;
4613 struct nlattr *tb[IFA_MAX+1];
4614 struct in6_addr *pfx, *peer_pfx;
4615 u32 ifa_flags;
4616 int err;
4617
4618 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4619 ifa_ipv6_policy, extack);
4620 if (err < 0)
4621 return err;
4622
4623 ifm = nlmsg_data(nlh);
4624 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4625 if (!pfx)
4626 return -EINVAL;
4627
4628 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4629
4630 /* We ignore other flags so far. */
4631 ifa_flags &= IFA_F_MANAGETEMPADDR;
4632
4633 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4634 ifm->ifa_prefixlen);
4635 }
4636
4637 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4638 unsigned long expires, u32 flags,
4639 bool modify_peer)
4640 {
4641 struct fib6_info *f6i;
4642 u32 prio;
4643
4644 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4645 ifp->prefix_len,
4646 ifp->idev->dev, 0, RTF_DEFAULT, true);
4647 if (!f6i)
4648 return -ENOENT;
4649
4650 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4651 if (f6i->fib6_metric != prio) {
4652 /* delete old one */
4653 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4654
4655 /* add new one */
4656 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4657 ifp->prefix_len,
4658 ifp->rt_priority, ifp->idev->dev,
4659 expires, flags, GFP_KERNEL);
4660 } else {
4661 if (!expires)
4662 fib6_clean_expires(f6i);
4663 else
4664 fib6_set_expires(f6i, expires);
4665
4666 fib6_info_release(f6i);
4667 }
4668
4669 return 0;
4670 }
4671
4672 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4673 {
4674 u32 flags;
4675 clock_t expires;
4676 unsigned long timeout;
4677 bool was_managetempaddr;
4678 bool had_prefixroute;
4679 bool new_peer = false;
4680
4681 ASSERT_RTNL();
4682
4683 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4684 return -EINVAL;
4685
4686 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4687 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4688 return -EINVAL;
4689
4690 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4691 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4692
4693 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4694 if (addrconf_finite_timeout(timeout)) {
4695 expires = jiffies_to_clock_t(timeout * HZ);
4696 cfg->valid_lft = timeout;
4697 flags = RTF_EXPIRES;
4698 } else {
4699 expires = 0;
4700 flags = 0;
4701 cfg->ifa_flags |= IFA_F_PERMANENT;
4702 }
4703
4704 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4705 if (addrconf_finite_timeout(timeout)) {
4706 if (timeout == 0)
4707 cfg->ifa_flags |= IFA_F_DEPRECATED;
4708 cfg->preferred_lft = timeout;
4709 }
4710
4711 if (cfg->peer_pfx &&
4712 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4713 if (!ipv6_addr_any(&ifp->peer_addr))
4714 cleanup_prefix_route(ifp, expires, true, true);
4715 new_peer = true;
4716 }
4717
4718 spin_lock_bh(&ifp->lock);
4719 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4720 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4721 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4722 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4723 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4724 IFA_F_NOPREFIXROUTE);
4725 ifp->flags |= cfg->ifa_flags;
4726 ifp->tstamp = jiffies;
4727 ifp->valid_lft = cfg->valid_lft;
4728 ifp->prefered_lft = cfg->preferred_lft;
4729
4730 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4731 ifp->rt_priority = cfg->rt_priority;
4732
4733 if (new_peer)
4734 ifp->peer_addr = *cfg->peer_pfx;
4735
4736 spin_unlock_bh(&ifp->lock);
4737 if (!(ifp->flags&IFA_F_TENTATIVE))
4738 ipv6_ifa_notify(0, ifp);
4739
4740 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4741 int rc = -ENOENT;
4742
4743 if (had_prefixroute)
4744 rc = modify_prefix_route(ifp, expires, flags, false);
4745
4746 /* prefix route could have been deleted; if so restore it */
4747 if (rc == -ENOENT) {
4748 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4749 ifp->rt_priority, ifp->idev->dev,
4750 expires, flags, GFP_KERNEL);
4751 }
4752
4753 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4754 rc = modify_prefix_route(ifp, expires, flags, true);
4755
4756 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4757 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4758 ifp->rt_priority, ifp->idev->dev,
4759 expires, flags, GFP_KERNEL);
4760 }
4761 } else if (had_prefixroute) {
4762 enum cleanup_prefix_rt_t action;
4763 unsigned long rt_expires;
4764
4765 write_lock_bh(&ifp->idev->lock);
4766 action = check_cleanup_prefix_route(ifp, &rt_expires);
4767 write_unlock_bh(&ifp->idev->lock);
4768
4769 if (action != CLEANUP_PREFIX_RT_NOP) {
4770 cleanup_prefix_route(ifp, rt_expires,
4771 action == CLEANUP_PREFIX_RT_DEL, false);
4772 }
4773 }
4774
4775 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4776 if (was_managetempaddr &&
4777 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4778 cfg->valid_lft = 0;
4779 cfg->preferred_lft = 0;
4780 }
4781 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4782 cfg->preferred_lft, !was_managetempaddr,
4783 jiffies);
4784 }
4785
4786 addrconf_verify_rtnl();
4787
4788 return 0;
4789 }
4790
4791 static int
4792 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4793 struct netlink_ext_ack *extack)
4794 {
4795 struct net *net = sock_net(skb->sk);
4796 struct ifaddrmsg *ifm;
4797 struct nlattr *tb[IFA_MAX+1];
4798 struct in6_addr *peer_pfx;
4799 struct inet6_ifaddr *ifa;
4800 struct net_device *dev;
4801 struct inet6_dev *idev;
4802 struct ifa6_config cfg;
4803 int err;
4804
4805 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4806 ifa_ipv6_policy, extack);
4807 if (err < 0)
4808 return err;
4809
4810 memset(&cfg, 0, sizeof(cfg));
4811
4812 ifm = nlmsg_data(nlh);
4813 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4814 if (!cfg.pfx)
4815 return -EINVAL;
4816
4817 cfg.peer_pfx = peer_pfx;
4818 cfg.plen = ifm->ifa_prefixlen;
4819 if (tb[IFA_RT_PRIORITY])
4820 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4821
4822 cfg.valid_lft = INFINITY_LIFE_TIME;
4823 cfg.preferred_lft = INFINITY_LIFE_TIME;
4824
4825 if (tb[IFA_CACHEINFO]) {
4826 struct ifa_cacheinfo *ci;
4827
4828 ci = nla_data(tb[IFA_CACHEINFO]);
4829 cfg.valid_lft = ci->ifa_valid;
4830 cfg.preferred_lft = ci->ifa_prefered;
4831 }
4832
4833 dev = __dev_get_by_index(net, ifm->ifa_index);
4834 if (!dev)
4835 return -ENODEV;
4836
4837 if (tb[IFA_FLAGS])
4838 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4839 else
4840 cfg.ifa_flags = ifm->ifa_flags;
4841
4842 /* We ignore other flags so far. */
4843 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4844 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4845 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4846
4847 idev = ipv6_find_idev(dev);
4848 if (IS_ERR(idev))
4849 return PTR_ERR(idev);
4850
4851 if (!ipv6_allow_optimistic_dad(net, idev))
4852 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4853
4854 if (cfg.ifa_flags & IFA_F_NODAD &&
4855 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4856 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4857 return -EINVAL;
4858 }
4859
4860 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4861 if (!ifa) {
4862 /*
4863 * It would be best to check for !NLM_F_CREATE here but
4864 * userspace already relies on not having to provide this.
4865 */
4866 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4867 }
4868
4869 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4870 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4871 err = -EEXIST;
4872 else
4873 err = inet6_addr_modify(ifa, &cfg);
4874
4875 in6_ifa_put(ifa);
4876
4877 return err;
4878 }
4879
4880 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4881 u8 scope, int ifindex)
4882 {
4883 struct ifaddrmsg *ifm;
4884
4885 ifm = nlmsg_data(nlh);
4886 ifm->ifa_family = AF_INET6;
4887 ifm->ifa_prefixlen = prefixlen;
4888 ifm->ifa_flags = flags;
4889 ifm->ifa_scope = scope;
4890 ifm->ifa_index = ifindex;
4891 }
4892
4893 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4894 unsigned long tstamp, u32 preferred, u32 valid)
4895 {
4896 struct ifa_cacheinfo ci;
4897
4898 ci.cstamp = cstamp_delta(cstamp);
4899 ci.tstamp = cstamp_delta(tstamp);
4900 ci.ifa_prefered = preferred;
4901 ci.ifa_valid = valid;
4902
4903 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4904 }
4905
4906 static inline int rt_scope(int ifa_scope)
4907 {
4908 if (ifa_scope & IFA_HOST)
4909 return RT_SCOPE_HOST;
4910 else if (ifa_scope & IFA_LINK)
4911 return RT_SCOPE_LINK;
4912 else if (ifa_scope & IFA_SITE)
4913 return RT_SCOPE_SITE;
4914 else
4915 return RT_SCOPE_UNIVERSE;
4916 }
4917
4918 static inline int inet6_ifaddr_msgsize(void)
4919 {
4920 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4921 + nla_total_size(16) /* IFA_LOCAL */
4922 + nla_total_size(16) /* IFA_ADDRESS */
4923 + nla_total_size(sizeof(struct ifa_cacheinfo))
4924 + nla_total_size(4) /* IFA_FLAGS */
4925 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4926 }
4927
4928 enum addr_type_t {
4929 UNICAST_ADDR,
4930 MULTICAST_ADDR,
4931 ANYCAST_ADDR,
4932 };
4933
4934 struct inet6_fill_args {
4935 u32 portid;
4936 u32 seq;
4937 int event;
4938 unsigned int flags;
4939 int netnsid;
4940 int ifindex;
4941 enum addr_type_t type;
4942 };
4943
4944 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4945 struct inet6_fill_args *args)
4946 {
4947 struct nlmsghdr *nlh;
4948 u32 preferred, valid;
4949
4950 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4951 sizeof(struct ifaddrmsg), args->flags);
4952 if (!nlh)
4953 return -EMSGSIZE;
4954
4955 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4956 ifa->idev->dev->ifindex);
4957
4958 if (args->netnsid >= 0 &&
4959 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4960 goto error;
4961
4962 if (!((ifa->flags&IFA_F_PERMANENT) &&
4963 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4964 preferred = ifa->prefered_lft;
4965 valid = ifa->valid_lft;
4966 if (preferred != INFINITY_LIFE_TIME) {
4967 long tval = (jiffies - ifa->tstamp)/HZ;
4968 if (preferred > tval)
4969 preferred -= tval;
4970 else
4971 preferred = 0;
4972 if (valid != INFINITY_LIFE_TIME) {
4973 if (valid > tval)
4974 valid -= tval;
4975 else
4976 valid = 0;
4977 }
4978 }
4979 } else {
4980 preferred = INFINITY_LIFE_TIME;
4981 valid = INFINITY_LIFE_TIME;
4982 }
4983
4984 if (!ipv6_addr_any(&ifa->peer_addr)) {
4985 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4986 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4987 goto error;
4988 } else
4989 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4990 goto error;
4991
4992 if (ifa->rt_priority &&
4993 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4994 goto error;
4995
4996 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4997 goto error;
4998
4999 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5000 goto error;
5001
5002 nlmsg_end(skb, nlh);
5003 return 0;
5004
5005 error:
5006 nlmsg_cancel(skb, nlh);
5007 return -EMSGSIZE;
5008 }
5009
5010 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5011 struct inet6_fill_args *args)
5012 {
5013 struct nlmsghdr *nlh;
5014 u8 scope = RT_SCOPE_UNIVERSE;
5015 int ifindex = ifmca->idev->dev->ifindex;
5016
5017 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5018 scope = RT_SCOPE_SITE;
5019
5020 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5021 sizeof(struct ifaddrmsg), args->flags);
5022 if (!nlh)
5023 return -EMSGSIZE;
5024
5025 if (args->netnsid >= 0 &&
5026 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5027 nlmsg_cancel(skb, nlh);
5028 return -EMSGSIZE;
5029 }
5030
5031 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5032 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5033 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5034 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5035 nlmsg_cancel(skb, nlh);
5036 return -EMSGSIZE;
5037 }
5038
5039 nlmsg_end(skb, nlh);
5040 return 0;
5041 }
5042
5043 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5044 struct inet6_fill_args *args)
5045 {
5046 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5047 int ifindex = dev ? dev->ifindex : 1;
5048 struct nlmsghdr *nlh;
5049 u8 scope = RT_SCOPE_UNIVERSE;
5050
5051 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5052 scope = RT_SCOPE_SITE;
5053
5054 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5055 sizeof(struct ifaddrmsg), args->flags);
5056 if (!nlh)
5057 return -EMSGSIZE;
5058
5059 if (args->netnsid >= 0 &&
5060 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5061 nlmsg_cancel(skb, nlh);
5062 return -EMSGSIZE;
5063 }
5064
5065 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5066 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5067 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5068 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5069 nlmsg_cancel(skb, nlh);
5070 return -EMSGSIZE;
5071 }
5072
5073 nlmsg_end(skb, nlh);
5074 return 0;
5075 }
5076
5077 /* called with rcu_read_lock() */
5078 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5079 struct netlink_callback *cb, int s_ip_idx,
5080 struct inet6_fill_args *fillargs)
5081 {
5082 struct ifmcaddr6 *ifmca;
5083 struct ifacaddr6 *ifaca;
5084 int ip_idx = 0;
5085 int err = 1;
5086
5087 read_lock_bh(&idev->lock);
5088 switch (fillargs->type) {
5089 case UNICAST_ADDR: {
5090 struct inet6_ifaddr *ifa;
5091 fillargs->event = RTM_NEWADDR;
5092
5093 /* unicast address incl. temp addr */
5094 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5095 if (ip_idx < s_ip_idx)
5096 goto next;
5097 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5098 if (err < 0)
5099 break;
5100 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5101 next:
5102 ip_idx++;
5103 }
5104 break;
5105 }
5106 case MULTICAST_ADDR:
5107 fillargs->event = RTM_GETMULTICAST;
5108
5109 /* multicast address */
5110 for (ifmca = idev->mc_list; ifmca;
5111 ifmca = ifmca->next, ip_idx++) {
5112 if (ip_idx < s_ip_idx)
5113 continue;
5114 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5115 if (err < 0)
5116 break;
5117 }
5118 break;
5119 case ANYCAST_ADDR:
5120 fillargs->event = RTM_GETANYCAST;
5121 /* anycast address */
5122 for (ifaca = idev->ac_list; ifaca;
5123 ifaca = ifaca->aca_next, ip_idx++) {
5124 if (ip_idx < s_ip_idx)
5125 continue;
5126 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5127 if (err < 0)
5128 break;
5129 }
5130 break;
5131 default:
5132 break;
5133 }
5134 read_unlock_bh(&idev->lock);
5135 cb->args[2] = ip_idx;
5136 return err;
5137 }
5138
5139 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5140 struct inet6_fill_args *fillargs,
5141 struct net **tgt_net, struct sock *sk,
5142 struct netlink_callback *cb)
5143 {
5144 struct netlink_ext_ack *extack = cb->extack;
5145 struct nlattr *tb[IFA_MAX+1];
5146 struct ifaddrmsg *ifm;
5147 int err, i;
5148
5149 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5150 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5151 return -EINVAL;
5152 }
5153
5154 ifm = nlmsg_data(nlh);
5155 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5156 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5157 return -EINVAL;
5158 }
5159
5160 fillargs->ifindex = ifm->ifa_index;
5161 if (fillargs->ifindex) {
5162 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5163 fillargs->flags |= NLM_F_DUMP_FILTERED;
5164 }
5165
5166 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5167 ifa_ipv6_policy, extack);
5168 if (err < 0)
5169 return err;
5170
5171 for (i = 0; i <= IFA_MAX; ++i) {
5172 if (!tb[i])
5173 continue;
5174
5175 if (i == IFA_TARGET_NETNSID) {
5176 struct net *net;
5177
5178 fillargs->netnsid = nla_get_s32(tb[i]);
5179 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5180 if (IS_ERR(net)) {
5181 fillargs->netnsid = -1;
5182 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5183 return PTR_ERR(net);
5184 }
5185 *tgt_net = net;
5186 } else {
5187 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5188 return -EINVAL;
5189 }
5190 }
5191
5192 return 0;
5193 }
5194
5195 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5196 enum addr_type_t type)
5197 {
5198 const struct nlmsghdr *nlh = cb->nlh;
5199 struct inet6_fill_args fillargs = {
5200 .portid = NETLINK_CB(cb->skb).portid,
5201 .seq = cb->nlh->nlmsg_seq,
5202 .flags = NLM_F_MULTI,
5203 .netnsid = -1,
5204 .type = type,
5205 };
5206 struct net *net = sock_net(skb->sk);
5207 struct net *tgt_net = net;
5208 int idx, s_idx, s_ip_idx;
5209 int h, s_h;
5210 struct net_device *dev;
5211 struct inet6_dev *idev;
5212 struct hlist_head *head;
5213 int err = 0;
5214
5215 s_h = cb->args[0];
5216 s_idx = idx = cb->args[1];
5217 s_ip_idx = cb->args[2];
5218
5219 if (cb->strict_check) {
5220 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5221 skb->sk, cb);
5222 if (err < 0)
5223 goto put_tgt_net;
5224
5225 err = 0;
5226 if (fillargs.ifindex) {
5227 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5228 if (!dev) {
5229 err = -ENODEV;
5230 goto put_tgt_net;
5231 }
5232 idev = __in6_dev_get(dev);
5233 if (idev) {
5234 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5235 &fillargs);
5236 if (err > 0)
5237 err = 0;
5238 }
5239 goto put_tgt_net;
5240 }
5241 }
5242
5243 rcu_read_lock();
5244 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5245 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5246 idx = 0;
5247 head = &tgt_net->dev_index_head[h];
5248 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5249 if (idx < s_idx)
5250 goto cont;
5251 if (h > s_h || idx > s_idx)
5252 s_ip_idx = 0;
5253 idev = __in6_dev_get(dev);
5254 if (!idev)
5255 goto cont;
5256
5257 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5258 &fillargs) < 0)
5259 goto done;
5260 cont:
5261 idx++;
5262 }
5263 }
5264 done:
5265 rcu_read_unlock();
5266 cb->args[0] = h;
5267 cb->args[1] = idx;
5268 put_tgt_net:
5269 if (fillargs.netnsid >= 0)
5270 put_net(tgt_net);
5271
5272 return skb->len ? : err;
5273 }
5274
5275 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5276 {
5277 enum addr_type_t type = UNICAST_ADDR;
5278
5279 return inet6_dump_addr(skb, cb, type);
5280 }
5281
5282 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5283 {
5284 enum addr_type_t type = MULTICAST_ADDR;
5285
5286 return inet6_dump_addr(skb, cb, type);
5287 }
5288
5289
5290 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5291 {
5292 enum addr_type_t type = ANYCAST_ADDR;
5293
5294 return inet6_dump_addr(skb, cb, type);
5295 }
5296
5297 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5298 const struct nlmsghdr *nlh,
5299 struct nlattr **tb,
5300 struct netlink_ext_ack *extack)
5301 {
5302 struct ifaddrmsg *ifm;
5303 int i, err;
5304
5305 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5306 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5307 return -EINVAL;
5308 }
5309
5310 if (!netlink_strict_get_check(skb))
5311 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5312 ifa_ipv6_policy, extack);
5313
5314 ifm = nlmsg_data(nlh);
5315 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5316 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5317 return -EINVAL;
5318 }
5319
5320 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5321 ifa_ipv6_policy, extack);
5322 if (err)
5323 return err;
5324
5325 for (i = 0; i <= IFA_MAX; i++) {
5326 if (!tb[i])
5327 continue;
5328
5329 switch (i) {
5330 case IFA_TARGET_NETNSID:
5331 case IFA_ADDRESS:
5332 case IFA_LOCAL:
5333 break;
5334 default:
5335 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5336 return -EINVAL;
5337 }
5338 }
5339
5340 return 0;
5341 }
5342
5343 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5344 struct netlink_ext_ack *extack)
5345 {
5346 struct net *net = sock_net(in_skb->sk);
5347 struct inet6_fill_args fillargs = {
5348 .portid = NETLINK_CB(in_skb).portid,
5349 .seq = nlh->nlmsg_seq,
5350 .event = RTM_NEWADDR,
5351 .flags = 0,
5352 .netnsid = -1,
5353 };
5354 struct net *tgt_net = net;
5355 struct ifaddrmsg *ifm;
5356 struct nlattr *tb[IFA_MAX+1];
5357 struct in6_addr *addr = NULL, *peer;
5358 struct net_device *dev = NULL;
5359 struct inet6_ifaddr *ifa;
5360 struct sk_buff *skb;
5361 int err;
5362
5363 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5364 if (err < 0)
5365 return err;
5366
5367 if (tb[IFA_TARGET_NETNSID]) {
5368 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5369
5370 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5371 fillargs.netnsid);
5372 if (IS_ERR(tgt_net))
5373 return PTR_ERR(tgt_net);
5374 }
5375
5376 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5377 if (!addr)
5378 return -EINVAL;
5379
5380 ifm = nlmsg_data(nlh);
5381 if (ifm->ifa_index)
5382 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5383
5384 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5385 if (!ifa) {
5386 err = -EADDRNOTAVAIL;
5387 goto errout;
5388 }
5389
5390 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5391 if (!skb) {
5392 err = -ENOBUFS;
5393 goto errout_ifa;
5394 }
5395
5396 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5397 if (err < 0) {
5398 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5399 WARN_ON(err == -EMSGSIZE);
5400 kfree_skb(skb);
5401 goto errout_ifa;
5402 }
5403 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5404 errout_ifa:
5405 in6_ifa_put(ifa);
5406 errout:
5407 if (dev)
5408 dev_put(dev);
5409 if (fillargs.netnsid >= 0)
5410 put_net(tgt_net);
5411
5412 return err;
5413 }
5414
5415 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5416 {
5417 struct sk_buff *skb;
5418 struct net *net = dev_net(ifa->idev->dev);
5419 struct inet6_fill_args fillargs = {
5420 .portid = 0,
5421 .seq = 0,
5422 .event = event,
5423 .flags = 0,
5424 .netnsid = -1,
5425 };
5426 int err = -ENOBUFS;
5427
5428 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5429 if (!skb)
5430 goto errout;
5431
5432 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5433 if (err < 0) {
5434 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5435 WARN_ON(err == -EMSGSIZE);
5436 kfree_skb(skb);
5437 goto errout;
5438 }
5439 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5440 return;
5441 errout:
5442 if (err < 0)
5443 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5444 }
5445
5446 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5447 __s32 *array, int bytes)
5448 {
5449 BUG_ON(bytes < (DEVCONF_MAX * 4));
5450
5451 memset(array, 0, bytes);
5452 array[DEVCONF_FORWARDING] = cnf->forwarding;
5453 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5454 array[DEVCONF_MTU6] = cnf->mtu6;
5455 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5456 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5457 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5458 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5459 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5460 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5461 jiffies_to_msecs(cnf->rtr_solicit_interval);
5462 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5463 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5464 array[DEVCONF_RTR_SOLICIT_DELAY] =
5465 jiffies_to_msecs(cnf->rtr_solicit_delay);
5466 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5467 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5468 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5469 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5470 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5471 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5472 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5473 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5474 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5475 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5476 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5477 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5478 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5479 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5480 #ifdef CONFIG_IPV6_ROUTER_PREF
5481 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5482 array[DEVCONF_RTR_PROBE_INTERVAL] =
5483 jiffies_to_msecs(cnf->rtr_probe_interval);
5484 #ifdef CONFIG_IPV6_ROUTE_INFO
5485 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5486 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5487 #endif
5488 #endif
5489 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5490 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5491 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5492 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5493 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5494 #endif
5495 #ifdef CONFIG_IPV6_MROUTE
5496 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5497 #endif
5498 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5499 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5500 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5501 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5502 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5503 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5504 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5505 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5506 /* we omit DEVCONF_STABLE_SECRET for now */
5507 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5508 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5509 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5510 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5511 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5512 #ifdef CONFIG_IPV6_SEG6_HMAC
5513 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5514 #endif
5515 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5516 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5517 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5518 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5519 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5520 }
5521
5522 static inline size_t inet6_ifla6_size(void)
5523 {
5524 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5525 + nla_total_size(sizeof(struct ifla_cacheinfo))
5526 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5527 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5528 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5529 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5530 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5531 + 0;
5532 }
5533
5534 static inline size_t inet6_if_nlmsg_size(void)
5535 {
5536 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5537 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5538 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5539 + nla_total_size(4) /* IFLA_MTU */
5540 + nla_total_size(4) /* IFLA_LINK */
5541 + nla_total_size(1) /* IFLA_OPERSTATE */
5542 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5543 }
5544
5545 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5546 int bytes)
5547 {
5548 int i;
5549 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5550 BUG_ON(pad < 0);
5551
5552 /* Use put_unaligned() because stats may not be aligned for u64. */
5553 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5554 for (i = 1; i < ICMP6_MIB_MAX; i++)
5555 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5556
5557 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5558 }
5559
5560 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5561 int bytes, size_t syncpoff)
5562 {
5563 int i, c;
5564 u64 buff[IPSTATS_MIB_MAX];
5565 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5566
5567 BUG_ON(pad < 0);
5568
5569 memset(buff, 0, sizeof(buff));
5570 buff[0] = IPSTATS_MIB_MAX;
5571
5572 for_each_possible_cpu(c) {
5573 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5574 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5575 }
5576
5577 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5578 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5579 }
5580
5581 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5582 int bytes)
5583 {
5584 switch (attrtype) {
5585 case IFLA_INET6_STATS:
5586 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5587 offsetof(struct ipstats_mib, syncp));
5588 break;
5589 case IFLA_INET6_ICMP6STATS:
5590 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5591 break;
5592 }
5593 }
5594
5595 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5596 u32 ext_filter_mask)
5597 {
5598 struct nlattr *nla;
5599 struct ifla_cacheinfo ci;
5600
5601 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5602 goto nla_put_failure;
5603 ci.max_reasm_len = IPV6_MAXPLEN;
5604 ci.tstamp = cstamp_delta(idev->tstamp);
5605 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5606 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5607 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5608 goto nla_put_failure;
5609 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5610 if (!nla)
5611 goto nla_put_failure;
5612 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5613
5614 /* XXX - MC not implemented */
5615
5616 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5617 return 0;
5618
5619 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5620 if (!nla)
5621 goto nla_put_failure;
5622 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5623
5624 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5625 if (!nla)
5626 goto nla_put_failure;
5627 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5628
5629 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5630 if (!nla)
5631 goto nla_put_failure;
5632 read_lock_bh(&idev->lock);
5633 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5634 read_unlock_bh(&idev->lock);
5635
5636 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5637 goto nla_put_failure;
5638
5639 return 0;
5640
5641 nla_put_failure:
5642 return -EMSGSIZE;
5643 }
5644
5645 static size_t inet6_get_link_af_size(const struct net_device *dev,
5646 u32 ext_filter_mask)
5647 {
5648 if (!__in6_dev_get(dev))
5649 return 0;
5650
5651 return inet6_ifla6_size();
5652 }
5653
5654 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5655 u32 ext_filter_mask)
5656 {
5657 struct inet6_dev *idev = __in6_dev_get(dev);
5658
5659 if (!idev)
5660 return -ENODATA;
5661
5662 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5663 return -EMSGSIZE;
5664
5665 return 0;
5666 }
5667
5668 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5669 {
5670 struct inet6_ifaddr *ifp;
5671 struct net_device *dev = idev->dev;
5672 bool clear_token, update_rs = false;
5673 struct in6_addr ll_addr;
5674
5675 ASSERT_RTNL();
5676
5677 if (!token)
5678 return -EINVAL;
5679 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5680 return -EINVAL;
5681 if (!ipv6_accept_ra(idev))
5682 return -EINVAL;
5683 if (idev->cnf.rtr_solicits == 0)
5684 return -EINVAL;
5685
5686 write_lock_bh(&idev->lock);
5687
5688 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5689 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5690
5691 write_unlock_bh(&idev->lock);
5692
5693 clear_token = ipv6_addr_any(token);
5694 if (clear_token)
5695 goto update_lft;
5696
5697 if (!idev->dead && (idev->if_flags & IF_READY) &&
5698 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5699 IFA_F_OPTIMISTIC)) {
5700 /* If we're not ready, then normal ifup will take care
5701 * of this. Otherwise, we need to request our rs here.
5702 */
5703 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5704 update_rs = true;
5705 }
5706
5707 update_lft:
5708 write_lock_bh(&idev->lock);
5709
5710 if (update_rs) {
5711 idev->if_flags |= IF_RS_SENT;
5712 idev->rs_interval = rfc3315_s14_backoff_init(
5713 idev->cnf.rtr_solicit_interval);
5714 idev->rs_probes = 1;
5715 addrconf_mod_rs_timer(idev, idev->rs_interval);
5716 }
5717
5718 /* Well, that's kinda nasty ... */
5719 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5720 spin_lock(&ifp->lock);
5721 if (ifp->tokenized) {
5722 ifp->valid_lft = 0;
5723 ifp->prefered_lft = 0;
5724 }
5725 spin_unlock(&ifp->lock);
5726 }
5727
5728 write_unlock_bh(&idev->lock);
5729 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5730 addrconf_verify_rtnl();
5731 return 0;
5732 }
5733
5734 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5735 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5736 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5737 };
5738
5739 static int check_addr_gen_mode(int mode)
5740 {
5741 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5742 mode != IN6_ADDR_GEN_MODE_NONE &&
5743 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5744 mode != IN6_ADDR_GEN_MODE_RANDOM)
5745 return -EINVAL;
5746 return 1;
5747 }
5748
5749 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5750 int mode)
5751 {
5752 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5753 !idev->cnf.stable_secret.initialized &&
5754 !net->ipv6.devconf_dflt->stable_secret.initialized)
5755 return -EINVAL;
5756 return 1;
5757 }
5758
5759 static int inet6_validate_link_af(const struct net_device *dev,
5760 const struct nlattr *nla)
5761 {
5762 struct nlattr *tb[IFLA_INET6_MAX + 1];
5763 struct inet6_dev *idev = NULL;
5764 int err;
5765
5766 if (dev) {
5767 idev = __in6_dev_get(dev);
5768 if (!idev)
5769 return -EAFNOSUPPORT;
5770 }
5771
5772 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5773 inet6_af_policy, NULL);
5774 if (err)
5775 return err;
5776
5777 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5778 return -EINVAL;
5779
5780 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5781 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5782
5783 if (check_addr_gen_mode(mode) < 0)
5784 return -EINVAL;
5785 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5786 return -EINVAL;
5787 }
5788
5789 return 0;
5790 }
5791
5792 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5793 {
5794 struct inet6_dev *idev = __in6_dev_get(dev);
5795 struct nlattr *tb[IFLA_INET6_MAX + 1];
5796 int err;
5797
5798 if (!idev)
5799 return -EAFNOSUPPORT;
5800
5801 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5802 BUG();
5803
5804 if (tb[IFLA_INET6_TOKEN]) {
5805 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5806 if (err)
5807 return err;
5808 }
5809
5810 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5811 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5812
5813 idev->cnf.addr_gen_mode = mode;
5814 }
5815
5816 return 0;
5817 }
5818
5819 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5820 u32 portid, u32 seq, int event, unsigned int flags)
5821 {
5822 struct net_device *dev = idev->dev;
5823 struct ifinfomsg *hdr;
5824 struct nlmsghdr *nlh;
5825 void *protoinfo;
5826
5827 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5828 if (!nlh)
5829 return -EMSGSIZE;
5830
5831 hdr = nlmsg_data(nlh);
5832 hdr->ifi_family = AF_INET6;
5833 hdr->__ifi_pad = 0;
5834 hdr->ifi_type = dev->type;
5835 hdr->ifi_index = dev->ifindex;
5836 hdr->ifi_flags = dev_get_flags(dev);
5837 hdr->ifi_change = 0;
5838
5839 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5840 (dev->addr_len &&
5841 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5842 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5843 (dev->ifindex != dev_get_iflink(dev) &&
5844 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5845 nla_put_u8(skb, IFLA_OPERSTATE,
5846 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5847 goto nla_put_failure;
5848 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5849 if (!protoinfo)
5850 goto nla_put_failure;
5851
5852 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5853 goto nla_put_failure;
5854
5855 nla_nest_end(skb, protoinfo);
5856 nlmsg_end(skb, nlh);
5857 return 0;
5858
5859 nla_put_failure:
5860 nlmsg_cancel(skb, nlh);
5861 return -EMSGSIZE;
5862 }
5863
5864 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5865 struct netlink_ext_ack *extack)
5866 {
5867 struct ifinfomsg *ifm;
5868
5869 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5870 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5871 return -EINVAL;
5872 }
5873
5874 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5875 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5876 return -EINVAL;
5877 }
5878
5879 ifm = nlmsg_data(nlh);
5880 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5881 ifm->ifi_change || ifm->ifi_index) {
5882 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5883 return -EINVAL;
5884 }
5885
5886 return 0;
5887 }
5888
5889 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5890 {
5891 struct net *net = sock_net(skb->sk);
5892 int h, s_h;
5893 int idx = 0, s_idx;
5894 struct net_device *dev;
5895 struct inet6_dev *idev;
5896 struct hlist_head *head;
5897
5898 /* only requests using strict checking can pass data to
5899 * influence the dump
5900 */
5901 if (cb->strict_check) {
5902 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5903
5904 if (err < 0)
5905 return err;
5906 }
5907
5908 s_h = cb->args[0];
5909 s_idx = cb->args[1];
5910
5911 rcu_read_lock();
5912 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5913 idx = 0;
5914 head = &net->dev_index_head[h];
5915 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5916 if (idx < s_idx)
5917 goto cont;
5918 idev = __in6_dev_get(dev);
5919 if (!idev)
5920 goto cont;
5921 if (inet6_fill_ifinfo(skb, idev,
5922 NETLINK_CB(cb->skb).portid,
5923 cb->nlh->nlmsg_seq,
5924 RTM_NEWLINK, NLM_F_MULTI) < 0)
5925 goto out;
5926 cont:
5927 idx++;
5928 }
5929 }
5930 out:
5931 rcu_read_unlock();
5932 cb->args[1] = idx;
5933 cb->args[0] = h;
5934
5935 return skb->len;
5936 }
5937
5938 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5939 {
5940 struct sk_buff *skb;
5941 struct net *net = dev_net(idev->dev);
5942 int err = -ENOBUFS;
5943
5944 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5945 if (!skb)
5946 goto errout;
5947
5948 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5949 if (err < 0) {
5950 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5951 WARN_ON(err == -EMSGSIZE);
5952 kfree_skb(skb);
5953 goto errout;
5954 }
5955 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5956 return;
5957 errout:
5958 if (err < 0)
5959 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5960 }
5961
5962 static inline size_t inet6_prefix_nlmsg_size(void)
5963 {
5964 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5965 + nla_total_size(sizeof(struct in6_addr))
5966 + nla_total_size(sizeof(struct prefix_cacheinfo));
5967 }
5968
5969 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5970 struct prefix_info *pinfo, u32 portid, u32 seq,
5971 int event, unsigned int flags)
5972 {
5973 struct prefixmsg *pmsg;
5974 struct nlmsghdr *nlh;
5975 struct prefix_cacheinfo ci;
5976
5977 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5978 if (!nlh)
5979 return -EMSGSIZE;
5980
5981 pmsg = nlmsg_data(nlh);
5982 pmsg->prefix_family = AF_INET6;
5983 pmsg->prefix_pad1 = 0;
5984 pmsg->prefix_pad2 = 0;
5985 pmsg->prefix_ifindex = idev->dev->ifindex;
5986 pmsg->prefix_len = pinfo->prefix_len;
5987 pmsg->prefix_type = pinfo->type;
5988 pmsg->prefix_pad3 = 0;
5989 pmsg->prefix_flags = 0;
5990 if (pinfo->onlink)
5991 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5992 if (pinfo->autoconf)
5993 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5994
5995 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5996 goto nla_put_failure;
5997 ci.preferred_time = ntohl(pinfo->prefered);
5998 ci.valid_time = ntohl(pinfo->valid);
5999 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6000 goto nla_put_failure;
6001 nlmsg_end(skb, nlh);
6002 return 0;
6003
6004 nla_put_failure:
6005 nlmsg_cancel(skb, nlh);
6006 return -EMSGSIZE;
6007 }
6008
6009 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6010 struct prefix_info *pinfo)
6011 {
6012 struct sk_buff *skb;
6013 struct net *net = dev_net(idev->dev);
6014 int err = -ENOBUFS;
6015
6016 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6017 if (!skb)
6018 goto errout;
6019
6020 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6021 if (err < 0) {
6022 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6023 WARN_ON(err == -EMSGSIZE);
6024 kfree_skb(skb);
6025 goto errout;
6026 }
6027 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6028 return;
6029 errout:
6030 if (err < 0)
6031 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6032 }
6033
6034 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6035 {
6036 struct net *net = dev_net(ifp->idev->dev);
6037
6038 if (event)
6039 ASSERT_RTNL();
6040
6041 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6042
6043 switch (event) {
6044 case RTM_NEWADDR:
6045 /*
6046 * If the address was optimistic we inserted the route at the
6047 * start of our DAD process, so we don't need to do it again.
6048 * If the device was taken down in the middle of the DAD
6049 * cycle there is a race where we could get here without a
6050 * host route, so nothing to insert. That will be fixed when
6051 * the device is brought up.
6052 */
6053 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6054 ip6_ins_rt(net, ifp->rt);
6055 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6056 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6057 &ifp->addr, ifp->idev->dev->name);
6058 }
6059
6060 if (ifp->idev->cnf.forwarding)
6061 addrconf_join_anycast(ifp);
6062 if (!ipv6_addr_any(&ifp->peer_addr))
6063 addrconf_prefix_route(&ifp->peer_addr, 128,
6064 ifp->rt_priority, ifp->idev->dev,
6065 0, 0, GFP_ATOMIC);
6066 break;
6067 case RTM_DELADDR:
6068 if (ifp->idev->cnf.forwarding)
6069 addrconf_leave_anycast(ifp);
6070 addrconf_leave_solict(ifp->idev, &ifp->addr);
6071 if (!ipv6_addr_any(&ifp->peer_addr)) {
6072 struct fib6_info *rt;
6073
6074 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6075 ifp->idev->dev, 0, 0,
6076 false);
6077 if (rt)
6078 ip6_del_rt(net, rt, false);
6079 }
6080 if (ifp->rt) {
6081 ip6_del_rt(net, ifp->rt, false);
6082 ifp->rt = NULL;
6083 }
6084 rt_genid_bump_ipv6(net);
6085 break;
6086 }
6087 atomic_inc(&net->ipv6.dev_addr_genid);
6088 }
6089
6090 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6091 {
6092 rcu_read_lock_bh();
6093 if (likely(ifp->idev->dead == 0))
6094 __ipv6_ifa_notify(event, ifp);
6095 rcu_read_unlock_bh();
6096 }
6097
6098 #ifdef CONFIG_SYSCTL
6099
6100 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6101 void *buffer, size_t *lenp, loff_t *ppos)
6102 {
6103 int *valp = ctl->data;
6104 int val = *valp;
6105 loff_t pos = *ppos;
6106 struct ctl_table lctl;
6107 int ret;
6108
6109 /*
6110 * ctl->data points to idev->cnf.forwarding, we should
6111 * not modify it until we get the rtnl lock.
6112 */
6113 lctl = *ctl;
6114 lctl.data = &val;
6115
6116 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6117
6118 if (write)
6119 ret = addrconf_fixup_forwarding(ctl, valp, val);
6120 if (ret)
6121 *ppos = pos;
6122 return ret;
6123 }
6124
6125 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6126 void *buffer, size_t *lenp, loff_t *ppos)
6127 {
6128 struct inet6_dev *idev = ctl->extra1;
6129 int min_mtu = IPV6_MIN_MTU;
6130 struct ctl_table lctl;
6131
6132 lctl = *ctl;
6133 lctl.extra1 = &min_mtu;
6134 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6135
6136 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6137 }
6138
6139 static void dev_disable_change(struct inet6_dev *idev)
6140 {
6141 struct netdev_notifier_info info;
6142
6143 if (!idev || !idev->dev)
6144 return;
6145
6146 netdev_notifier_info_init(&info, idev->dev);
6147 if (idev->cnf.disable_ipv6)
6148 addrconf_notify(NULL, NETDEV_DOWN, &info);
6149 else
6150 addrconf_notify(NULL, NETDEV_UP, &info);
6151 }
6152
6153 static void addrconf_disable_change(struct net *net, __s32 newf)
6154 {
6155 struct net_device *dev;
6156 struct inet6_dev *idev;
6157
6158 for_each_netdev(net, dev) {
6159 idev = __in6_dev_get(dev);
6160 if (idev) {
6161 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6162 idev->cnf.disable_ipv6 = newf;
6163 if (changed)
6164 dev_disable_change(idev);
6165 }
6166 }
6167 }
6168
6169 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6170 {
6171 struct net *net;
6172 int old;
6173
6174 if (!rtnl_trylock())
6175 return restart_syscall();
6176
6177 net = (struct net *)table->extra2;
6178 old = *p;
6179 *p = newf;
6180
6181 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6182 rtnl_unlock();
6183 return 0;
6184 }
6185
6186 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6187 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6188 addrconf_disable_change(net, newf);
6189 } else if ((!newf) ^ (!old))
6190 dev_disable_change((struct inet6_dev *)table->extra1);
6191
6192 rtnl_unlock();
6193 return 0;
6194 }
6195
6196 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6197 void *buffer, size_t *lenp, loff_t *ppos)
6198 {
6199 int *valp = ctl->data;
6200 int val = *valp;
6201 loff_t pos = *ppos;
6202 struct ctl_table lctl;
6203 int ret;
6204
6205 /*
6206 * ctl->data points to idev->cnf.disable_ipv6, we should
6207 * not modify it until we get the rtnl lock.
6208 */
6209 lctl = *ctl;
6210 lctl.data = &val;
6211
6212 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6213
6214 if (write)
6215 ret = addrconf_disable_ipv6(ctl, valp, val);
6216 if (ret)
6217 *ppos = pos;
6218 return ret;
6219 }
6220
6221 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6222 void *buffer, size_t *lenp, loff_t *ppos)
6223 {
6224 int *valp = ctl->data;
6225 int ret;
6226 int old, new;
6227
6228 old = *valp;
6229 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6230 new = *valp;
6231
6232 if (write && old != new) {
6233 struct net *net = ctl->extra2;
6234
6235 if (!rtnl_trylock())
6236 return restart_syscall();
6237
6238 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6239 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6240 NETCONFA_PROXY_NEIGH,
6241 NETCONFA_IFINDEX_DEFAULT,
6242 net->ipv6.devconf_dflt);
6243 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6244 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6245 NETCONFA_PROXY_NEIGH,
6246 NETCONFA_IFINDEX_ALL,
6247 net->ipv6.devconf_all);
6248 else {
6249 struct inet6_dev *idev = ctl->extra1;
6250
6251 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6252 NETCONFA_PROXY_NEIGH,
6253 idev->dev->ifindex,
6254 &idev->cnf);
6255 }
6256 rtnl_unlock();
6257 }
6258
6259 return ret;
6260 }
6261
6262 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6263 void *buffer, size_t *lenp,
6264 loff_t *ppos)
6265 {
6266 int ret = 0;
6267 u32 new_val;
6268 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6269 struct net *net = (struct net *)ctl->extra2;
6270 struct ctl_table tmp = {
6271 .data = &new_val,
6272 .maxlen = sizeof(new_val),
6273 .mode = ctl->mode,
6274 };
6275
6276 if (!rtnl_trylock())
6277 return restart_syscall();
6278
6279 new_val = *((u32 *)ctl->data);
6280
6281 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6282 if (ret != 0)
6283 goto out;
6284
6285 if (write) {
6286 if (check_addr_gen_mode(new_val) < 0) {
6287 ret = -EINVAL;
6288 goto out;
6289 }
6290
6291 if (idev) {
6292 if (check_stable_privacy(idev, net, new_val) < 0) {
6293 ret = -EINVAL;
6294 goto out;
6295 }
6296
6297 if (idev->cnf.addr_gen_mode != new_val) {
6298 idev->cnf.addr_gen_mode = new_val;
6299 addrconf_dev_config(idev->dev);
6300 }
6301 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6302 struct net_device *dev;
6303
6304 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6305 for_each_netdev(net, dev) {
6306 idev = __in6_dev_get(dev);
6307 if (idev &&
6308 idev->cnf.addr_gen_mode != new_val) {
6309 idev->cnf.addr_gen_mode = new_val;
6310 addrconf_dev_config(idev->dev);
6311 }
6312 }
6313 }
6314
6315 *((u32 *)ctl->data) = new_val;
6316 }
6317
6318 out:
6319 rtnl_unlock();
6320
6321 return ret;
6322 }
6323
6324 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6325 void *buffer, size_t *lenp,
6326 loff_t *ppos)
6327 {
6328 int err;
6329 struct in6_addr addr;
6330 char str[IPV6_MAX_STRLEN];
6331 struct ctl_table lctl = *ctl;
6332 struct net *net = ctl->extra2;
6333 struct ipv6_stable_secret *secret = ctl->data;
6334
6335 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6336 return -EIO;
6337
6338 lctl.maxlen = IPV6_MAX_STRLEN;
6339 lctl.data = str;
6340
6341 if (!rtnl_trylock())
6342 return restart_syscall();
6343
6344 if (!write && !secret->initialized) {
6345 err = -EIO;
6346 goto out;
6347 }
6348
6349 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6350 if (err >= sizeof(str)) {
6351 err = -EIO;
6352 goto out;
6353 }
6354
6355 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6356 if (err || !write)
6357 goto out;
6358
6359 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6360 err = -EIO;
6361 goto out;
6362 }
6363
6364 secret->initialized = true;
6365 secret->secret = addr;
6366
6367 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6368 struct net_device *dev;
6369
6370 for_each_netdev(net, dev) {
6371 struct inet6_dev *idev = __in6_dev_get(dev);
6372
6373 if (idev) {
6374 idev->cnf.addr_gen_mode =
6375 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6376 }
6377 }
6378 } else {
6379 struct inet6_dev *idev = ctl->extra1;
6380
6381 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6382 }
6383
6384 out:
6385 rtnl_unlock();
6386
6387 return err;
6388 }
6389
6390 static
6391 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6392 int write, void *buffer,
6393 size_t *lenp,
6394 loff_t *ppos)
6395 {
6396 int *valp = ctl->data;
6397 int val = *valp;
6398 loff_t pos = *ppos;
6399 struct ctl_table lctl;
6400 int ret;
6401
6402 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6403 * we should not modify it until we get the rtnl lock.
6404 */
6405 lctl = *ctl;
6406 lctl.data = &val;
6407
6408 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6409
6410 if (write)
6411 ret = addrconf_fixup_linkdown(ctl, valp, val);
6412 if (ret)
6413 *ppos = pos;
6414 return ret;
6415 }
6416
6417 static
6418 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6419 {
6420 if (rt) {
6421 if (action)
6422 rt->dst.flags |= DST_NOPOLICY;
6423 else
6424 rt->dst.flags &= ~DST_NOPOLICY;
6425 }
6426 }
6427
6428 static
6429 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6430 {
6431 struct inet6_ifaddr *ifa;
6432
6433 read_lock_bh(&idev->lock);
6434 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6435 spin_lock(&ifa->lock);
6436 if (ifa->rt) {
6437 /* host routes only use builtin fib6_nh */
6438 struct fib6_nh *nh = ifa->rt->fib6_nh;
6439 int cpu;
6440
6441 rcu_read_lock();
6442 ifa->rt->dst_nopolicy = val ? true : false;
6443 if (nh->rt6i_pcpu) {
6444 for_each_possible_cpu(cpu) {
6445 struct rt6_info **rtp;
6446
6447 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6448 addrconf_set_nopolicy(*rtp, val);
6449 }
6450 }
6451 rcu_read_unlock();
6452 }
6453 spin_unlock(&ifa->lock);
6454 }
6455 read_unlock_bh(&idev->lock);
6456 }
6457
6458 static
6459 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6460 {
6461 struct inet6_dev *idev;
6462 struct net *net;
6463
6464 if (!rtnl_trylock())
6465 return restart_syscall();
6466
6467 *valp = val;
6468
6469 net = (struct net *)ctl->extra2;
6470 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6471 rtnl_unlock();
6472 return 0;
6473 }
6474
6475 if (valp == &net->ipv6.devconf_all->disable_policy) {
6476 struct net_device *dev;
6477
6478 for_each_netdev(net, dev) {
6479 idev = __in6_dev_get(dev);
6480 if (idev)
6481 addrconf_disable_policy_idev(idev, val);
6482 }
6483 } else {
6484 idev = (struct inet6_dev *)ctl->extra1;
6485 addrconf_disable_policy_idev(idev, val);
6486 }
6487
6488 rtnl_unlock();
6489 return 0;
6490 }
6491
6492 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6493 void *buffer, size_t *lenp, loff_t *ppos)
6494 {
6495 int *valp = ctl->data;
6496 int val = *valp;
6497 loff_t pos = *ppos;
6498 struct ctl_table lctl;
6499 int ret;
6500
6501 lctl = *ctl;
6502 lctl.data = &val;
6503 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6504
6505 if (write && (*valp != val))
6506 ret = addrconf_disable_policy(ctl, valp, val);
6507
6508 if (ret)
6509 *ppos = pos;
6510
6511 return ret;
6512 }
6513
6514 static int minus_one = -1;
6515 static const int two_five_five = 255;
6516
6517 static const struct ctl_table addrconf_sysctl[] = {
6518 {
6519 .procname = "forwarding",
6520 .data = &ipv6_devconf.forwarding,
6521 .maxlen = sizeof(int),
6522 .mode = 0644,
6523 .proc_handler = addrconf_sysctl_forward,
6524 },
6525 {
6526 .procname = "hop_limit",
6527 .data = &ipv6_devconf.hop_limit,
6528 .maxlen = sizeof(int),
6529 .mode = 0644,
6530 .proc_handler = proc_dointvec_minmax,
6531 .extra1 = (void *)SYSCTL_ONE,
6532 .extra2 = (void *)&two_five_five,
6533 },
6534 {
6535 .procname = "mtu",
6536 .data = &ipv6_devconf.mtu6,
6537 .maxlen = sizeof(int),
6538 .mode = 0644,
6539 .proc_handler = addrconf_sysctl_mtu,
6540 },
6541 {
6542 .procname = "accept_ra",
6543 .data = &ipv6_devconf.accept_ra,
6544 .maxlen = sizeof(int),
6545 .mode = 0644,
6546 .proc_handler = proc_dointvec,
6547 },
6548 {
6549 .procname = "accept_redirects",
6550 .data = &ipv6_devconf.accept_redirects,
6551 .maxlen = sizeof(int),
6552 .mode = 0644,
6553 .proc_handler = proc_dointvec,
6554 },
6555 {
6556 .procname = "autoconf",
6557 .data = &ipv6_devconf.autoconf,
6558 .maxlen = sizeof(int),
6559 .mode = 0644,
6560 .proc_handler = proc_dointvec,
6561 },
6562 {
6563 .procname = "dad_transmits",
6564 .data = &ipv6_devconf.dad_transmits,
6565 .maxlen = sizeof(int),
6566 .mode = 0644,
6567 .proc_handler = proc_dointvec,
6568 },
6569 {
6570 .procname = "router_solicitations",
6571 .data = &ipv6_devconf.rtr_solicits,
6572 .maxlen = sizeof(int),
6573 .mode = 0644,
6574 .proc_handler = proc_dointvec_minmax,
6575 .extra1 = &minus_one,
6576 },
6577 {
6578 .procname = "router_solicitation_interval",
6579 .data = &ipv6_devconf.rtr_solicit_interval,
6580 .maxlen = sizeof(int),
6581 .mode = 0644,
6582 .proc_handler = proc_dointvec_jiffies,
6583 },
6584 {
6585 .procname = "router_solicitation_max_interval",
6586 .data = &ipv6_devconf.rtr_solicit_max_interval,
6587 .maxlen = sizeof(int),
6588 .mode = 0644,
6589 .proc_handler = proc_dointvec_jiffies,
6590 },
6591 {
6592 .procname = "router_solicitation_delay",
6593 .data = &ipv6_devconf.rtr_solicit_delay,
6594 .maxlen = sizeof(int),
6595 .mode = 0644,
6596 .proc_handler = proc_dointvec_jiffies,
6597 },
6598 {
6599 .procname = "force_mld_version",
6600 .data = &ipv6_devconf.force_mld_version,
6601 .maxlen = sizeof(int),
6602 .mode = 0644,
6603 .proc_handler = proc_dointvec,
6604 },
6605 {
6606 .procname = "mldv1_unsolicited_report_interval",
6607 .data =
6608 &ipv6_devconf.mldv1_unsolicited_report_interval,
6609 .maxlen = sizeof(int),
6610 .mode = 0644,
6611 .proc_handler = proc_dointvec_ms_jiffies,
6612 },
6613 {
6614 .procname = "mldv2_unsolicited_report_interval",
6615 .data =
6616 &ipv6_devconf.mldv2_unsolicited_report_interval,
6617 .maxlen = sizeof(int),
6618 .mode = 0644,
6619 .proc_handler = proc_dointvec_ms_jiffies,
6620 },
6621 {
6622 .procname = "use_tempaddr",
6623 .data = &ipv6_devconf.use_tempaddr,
6624 .maxlen = sizeof(int),
6625 .mode = 0644,
6626 .proc_handler = proc_dointvec,
6627 },
6628 {
6629 .procname = "temp_valid_lft",
6630 .data = &ipv6_devconf.temp_valid_lft,
6631 .maxlen = sizeof(int),
6632 .mode = 0644,
6633 .proc_handler = proc_dointvec,
6634 },
6635 {
6636 .procname = "temp_prefered_lft",
6637 .data = &ipv6_devconf.temp_prefered_lft,
6638 .maxlen = sizeof(int),
6639 .mode = 0644,
6640 .proc_handler = proc_dointvec,
6641 },
6642 {
6643 .procname = "regen_max_retry",
6644 .data = &ipv6_devconf.regen_max_retry,
6645 .maxlen = sizeof(int),
6646 .mode = 0644,
6647 .proc_handler = proc_dointvec,
6648 },
6649 {
6650 .procname = "max_desync_factor",
6651 .data = &ipv6_devconf.max_desync_factor,
6652 .maxlen = sizeof(int),
6653 .mode = 0644,
6654 .proc_handler = proc_dointvec,
6655 },
6656 {
6657 .procname = "max_addresses",
6658 .data = &ipv6_devconf.max_addresses,
6659 .maxlen = sizeof(int),
6660 .mode = 0644,
6661 .proc_handler = proc_dointvec,
6662 },
6663 {
6664 .procname = "accept_ra_defrtr",
6665 .data = &ipv6_devconf.accept_ra_defrtr,
6666 .maxlen = sizeof(int),
6667 .mode = 0644,
6668 .proc_handler = proc_dointvec,
6669 },
6670 {
6671 .procname = "accept_ra_min_hop_limit",
6672 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6673 .maxlen = sizeof(int),
6674 .mode = 0644,
6675 .proc_handler = proc_dointvec,
6676 },
6677 {
6678 .procname = "accept_ra_pinfo",
6679 .data = &ipv6_devconf.accept_ra_pinfo,
6680 .maxlen = sizeof(int),
6681 .mode = 0644,
6682 .proc_handler = proc_dointvec,
6683 },
6684 #ifdef CONFIG_IPV6_ROUTER_PREF
6685 {
6686 .procname = "accept_ra_rtr_pref",
6687 .data = &ipv6_devconf.accept_ra_rtr_pref,
6688 .maxlen = sizeof(int),
6689 .mode = 0644,
6690 .proc_handler = proc_dointvec,
6691 },
6692 {
6693 .procname = "router_probe_interval",
6694 .data = &ipv6_devconf.rtr_probe_interval,
6695 .maxlen = sizeof(int),
6696 .mode = 0644,
6697 .proc_handler = proc_dointvec_jiffies,
6698 },
6699 #ifdef CONFIG_IPV6_ROUTE_INFO
6700 {
6701 .procname = "accept_ra_rt_info_min_plen",
6702 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6703 .maxlen = sizeof(int),
6704 .mode = 0644,
6705 .proc_handler = proc_dointvec,
6706 },
6707 {
6708 .procname = "accept_ra_rt_info_max_plen",
6709 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6710 .maxlen = sizeof(int),
6711 .mode = 0644,
6712 .proc_handler = proc_dointvec,
6713 },
6714 #endif
6715 #endif
6716 {
6717 .procname = "proxy_ndp",
6718 .data = &ipv6_devconf.proxy_ndp,
6719 .maxlen = sizeof(int),
6720 .mode = 0644,
6721 .proc_handler = addrconf_sysctl_proxy_ndp,
6722 },
6723 {
6724 .procname = "accept_source_route",
6725 .data = &ipv6_devconf.accept_source_route,
6726 .maxlen = sizeof(int),
6727 .mode = 0644,
6728 .proc_handler = proc_dointvec,
6729 },
6730 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6731 {
6732 .procname = "optimistic_dad",
6733 .data = &ipv6_devconf.optimistic_dad,
6734 .maxlen = sizeof(int),
6735 .mode = 0644,
6736 .proc_handler = proc_dointvec,
6737 },
6738 {
6739 .procname = "use_optimistic",
6740 .data = &ipv6_devconf.use_optimistic,
6741 .maxlen = sizeof(int),
6742 .mode = 0644,
6743 .proc_handler = proc_dointvec,
6744 },
6745 #endif
6746 #ifdef CONFIG_IPV6_MROUTE
6747 {
6748 .procname = "mc_forwarding",
6749 .data = &ipv6_devconf.mc_forwarding,
6750 .maxlen = sizeof(int),
6751 .mode = 0444,
6752 .proc_handler = proc_dointvec,
6753 },
6754 #endif
6755 {
6756 .procname = "disable_ipv6",
6757 .data = &ipv6_devconf.disable_ipv6,
6758 .maxlen = sizeof(int),
6759 .mode = 0644,
6760 .proc_handler = addrconf_sysctl_disable,
6761 },
6762 {
6763 .procname = "accept_dad",
6764 .data = &ipv6_devconf.accept_dad,
6765 .maxlen = sizeof(int),
6766 .mode = 0644,
6767 .proc_handler = proc_dointvec,
6768 },
6769 {
6770 .procname = "force_tllao",
6771 .data = &ipv6_devconf.force_tllao,
6772 .maxlen = sizeof(int),
6773 .mode = 0644,
6774 .proc_handler = proc_dointvec
6775 },
6776 {
6777 .procname = "ndisc_notify",
6778 .data = &ipv6_devconf.ndisc_notify,
6779 .maxlen = sizeof(int),
6780 .mode = 0644,
6781 .proc_handler = proc_dointvec
6782 },
6783 {
6784 .procname = "suppress_frag_ndisc",
6785 .data = &ipv6_devconf.suppress_frag_ndisc,
6786 .maxlen = sizeof(int),
6787 .mode = 0644,
6788 .proc_handler = proc_dointvec
6789 },
6790 {
6791 .procname = "accept_ra_from_local",
6792 .data = &ipv6_devconf.accept_ra_from_local,
6793 .maxlen = sizeof(int),
6794 .mode = 0644,
6795 .proc_handler = proc_dointvec,
6796 },
6797 {
6798 .procname = "accept_ra_mtu",
6799 .data = &ipv6_devconf.accept_ra_mtu,
6800 .maxlen = sizeof(int),
6801 .mode = 0644,
6802 .proc_handler = proc_dointvec,
6803 },
6804 {
6805 .procname = "stable_secret",
6806 .data = &ipv6_devconf.stable_secret,
6807 .maxlen = IPV6_MAX_STRLEN,
6808 .mode = 0600,
6809 .proc_handler = addrconf_sysctl_stable_secret,
6810 },
6811 {
6812 .procname = "use_oif_addrs_only",
6813 .data = &ipv6_devconf.use_oif_addrs_only,
6814 .maxlen = sizeof(int),
6815 .mode = 0644,
6816 .proc_handler = proc_dointvec,
6817 },
6818 {
6819 .procname = "ignore_routes_with_linkdown",
6820 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6821 .maxlen = sizeof(int),
6822 .mode = 0644,
6823 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6824 },
6825 {
6826 .procname = "drop_unicast_in_l2_multicast",
6827 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6828 .maxlen = sizeof(int),
6829 .mode = 0644,
6830 .proc_handler = proc_dointvec,
6831 },
6832 {
6833 .procname = "drop_unsolicited_na",
6834 .data = &ipv6_devconf.drop_unsolicited_na,
6835 .maxlen = sizeof(int),
6836 .mode = 0644,
6837 .proc_handler = proc_dointvec,
6838 },
6839 {
6840 .procname = "keep_addr_on_down",
6841 .data = &ipv6_devconf.keep_addr_on_down,
6842 .maxlen = sizeof(int),
6843 .mode = 0644,
6844 .proc_handler = proc_dointvec,
6845
6846 },
6847 {
6848 .procname = "seg6_enabled",
6849 .data = &ipv6_devconf.seg6_enabled,
6850 .maxlen = sizeof(int),
6851 .mode = 0644,
6852 .proc_handler = proc_dointvec,
6853 },
6854 #ifdef CONFIG_IPV6_SEG6_HMAC
6855 {
6856 .procname = "seg6_require_hmac",
6857 .data = &ipv6_devconf.seg6_require_hmac,
6858 .maxlen = sizeof(int),
6859 .mode = 0644,
6860 .proc_handler = proc_dointvec,
6861 },
6862 #endif
6863 {
6864 .procname = "enhanced_dad",
6865 .data = &ipv6_devconf.enhanced_dad,
6866 .maxlen = sizeof(int),
6867 .mode = 0644,
6868 .proc_handler = proc_dointvec,
6869 },
6870 {
6871 .procname = "addr_gen_mode",
6872 .data = &ipv6_devconf.addr_gen_mode,
6873 .maxlen = sizeof(int),
6874 .mode = 0644,
6875 .proc_handler = addrconf_sysctl_addr_gen_mode,
6876 },
6877 {
6878 .procname = "disable_policy",
6879 .data = &ipv6_devconf.disable_policy,
6880 .maxlen = sizeof(int),
6881 .mode = 0644,
6882 .proc_handler = addrconf_sysctl_disable_policy,
6883 },
6884 {
6885 .procname = "ndisc_tclass",
6886 .data = &ipv6_devconf.ndisc_tclass,
6887 .maxlen = sizeof(int),
6888 .mode = 0644,
6889 .proc_handler = proc_dointvec_minmax,
6890 .extra1 = (void *)SYSCTL_ZERO,
6891 .extra2 = (void *)&two_five_five,
6892 },
6893 {
6894 .procname = "rpl_seg_enabled",
6895 .data = &ipv6_devconf.rpl_seg_enabled,
6896 .maxlen = sizeof(int),
6897 .mode = 0644,
6898 .proc_handler = proc_dointvec,
6899 },
6900 {
6901 /* sentinel */
6902 }
6903 };
6904
6905 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6906 struct inet6_dev *idev, struct ipv6_devconf *p)
6907 {
6908 int i, ifindex;
6909 struct ctl_table *table;
6910 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6911
6912 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6913 if (!table)
6914 goto out;
6915
6916 for (i = 0; table[i].data; i++) {
6917 table[i].data += (char *)p - (char *)&ipv6_devconf;
6918 /* If one of these is already set, then it is not safe to
6919 * overwrite either of them: this makes proc_dointvec_minmax
6920 * usable.
6921 */
6922 if (!table[i].extra1 && !table[i].extra2) {
6923 table[i].extra1 = idev; /* embedded; no ref */
6924 table[i].extra2 = net;
6925 }
6926 }
6927
6928 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6929
6930 p->sysctl_header = register_net_sysctl(net, path, table);
6931 if (!p->sysctl_header)
6932 goto free;
6933
6934 if (!strcmp(dev_name, "all"))
6935 ifindex = NETCONFA_IFINDEX_ALL;
6936 else if (!strcmp(dev_name, "default"))
6937 ifindex = NETCONFA_IFINDEX_DEFAULT;
6938 else
6939 ifindex = idev->dev->ifindex;
6940 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6941 ifindex, p);
6942 return 0;
6943
6944 free:
6945 kfree(table);
6946 out:
6947 return -ENOBUFS;
6948 }
6949
6950 static void __addrconf_sysctl_unregister(struct net *net,
6951 struct ipv6_devconf *p, int ifindex)
6952 {
6953 struct ctl_table *table;
6954
6955 if (!p->sysctl_header)
6956 return;
6957
6958 table = p->sysctl_header->ctl_table_arg;
6959 unregister_net_sysctl_table(p->sysctl_header);
6960 p->sysctl_header = NULL;
6961 kfree(table);
6962
6963 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6964 }
6965
6966 static int addrconf_sysctl_register(struct inet6_dev *idev)
6967 {
6968 int err;
6969
6970 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6971 return -EINVAL;
6972
6973 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6974 &ndisc_ifinfo_sysctl_change);
6975 if (err)
6976 return err;
6977 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6978 idev, &idev->cnf);
6979 if (err)
6980 neigh_sysctl_unregister(idev->nd_parms);
6981
6982 return err;
6983 }
6984
6985 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6986 {
6987 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6988 idev->dev->ifindex);
6989 neigh_sysctl_unregister(idev->nd_parms);
6990 }
6991
6992
6993 #endif
6994
6995 static int __net_init addrconf_init_net(struct net *net)
6996 {
6997 int err = -ENOMEM;
6998 struct ipv6_devconf *all, *dflt;
6999
7000 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7001 if (!all)
7002 goto err_alloc_all;
7003
7004 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7005 if (!dflt)
7006 goto err_alloc_dflt;
7007
7008 if (IS_ENABLED(CONFIG_SYSCTL) &&
7009 !net_eq(net, &init_net)) {
7010 switch (sysctl_devconf_inherit_init_net) {
7011 case 1: /* copy from init_net */
7012 memcpy(all, init_net.ipv6.devconf_all,
7013 sizeof(ipv6_devconf));
7014 memcpy(dflt, init_net.ipv6.devconf_dflt,
7015 sizeof(ipv6_devconf_dflt));
7016 break;
7017 case 3: /* copy from the current netns */
7018 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7019 sizeof(ipv6_devconf));
7020 memcpy(dflt,
7021 current->nsproxy->net_ns->ipv6.devconf_dflt,
7022 sizeof(ipv6_devconf_dflt));
7023 break;
7024 case 0:
7025 case 2:
7026 /* use compiled values */
7027 break;
7028 }
7029 }
7030
7031 /* these will be inherited by all namespaces */
7032 dflt->autoconf = ipv6_defaults.autoconf;
7033 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7034
7035 dflt->stable_secret.initialized = false;
7036 all->stable_secret.initialized = false;
7037
7038 net->ipv6.devconf_all = all;
7039 net->ipv6.devconf_dflt = dflt;
7040
7041 #ifdef CONFIG_SYSCTL
7042 err = __addrconf_sysctl_register(net, "all", NULL, all);
7043 if (err < 0)
7044 goto err_reg_all;
7045
7046 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7047 if (err < 0)
7048 goto err_reg_dflt;
7049 #endif
7050 return 0;
7051
7052 #ifdef CONFIG_SYSCTL
7053 err_reg_dflt:
7054 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7055 err_reg_all:
7056 kfree(dflt);
7057 #endif
7058 err_alloc_dflt:
7059 kfree(all);
7060 err_alloc_all:
7061 return err;
7062 }
7063
7064 static void __net_exit addrconf_exit_net(struct net *net)
7065 {
7066 #ifdef CONFIG_SYSCTL
7067 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7068 NETCONFA_IFINDEX_DEFAULT);
7069 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7070 NETCONFA_IFINDEX_ALL);
7071 #endif
7072 kfree(net->ipv6.devconf_dflt);
7073 kfree(net->ipv6.devconf_all);
7074 }
7075
7076 static struct pernet_operations addrconf_ops = {
7077 .init = addrconf_init_net,
7078 .exit = addrconf_exit_net,
7079 };
7080
7081 static struct rtnl_af_ops inet6_ops __read_mostly = {
7082 .family = AF_INET6,
7083 .fill_link_af = inet6_fill_link_af,
7084 .get_link_af_size = inet6_get_link_af_size,
7085 .validate_link_af = inet6_validate_link_af,
7086 .set_link_af = inet6_set_link_af,
7087 };
7088
7089 /*
7090 * Init / cleanup code
7091 */
7092
7093 int __init addrconf_init(void)
7094 {
7095 struct inet6_dev *idev;
7096 int i, err;
7097
7098 err = ipv6_addr_label_init();
7099 if (err < 0) {
7100 pr_crit("%s: cannot initialize default policy table: %d\n",
7101 __func__, err);
7102 goto out;
7103 }
7104
7105 err = register_pernet_subsys(&addrconf_ops);
7106 if (err < 0)
7107 goto out_addrlabel;
7108
7109 addrconf_wq = create_workqueue("ipv6_addrconf");
7110 if (!addrconf_wq) {
7111 err = -ENOMEM;
7112 goto out_nowq;
7113 }
7114
7115 /* The addrconf netdev notifier requires that loopback_dev
7116 * has it's ipv6 private information allocated and setup
7117 * before it can bring up and give link-local addresses
7118 * to other devices which are up.
7119 *
7120 * Unfortunately, loopback_dev is not necessarily the first
7121 * entry in the global dev_base list of net devices. In fact,
7122 * it is likely to be the very last entry on that list.
7123 * So this causes the notifier registry below to try and
7124 * give link-local addresses to all devices besides loopback_dev
7125 * first, then loopback_dev, which cases all the non-loopback_dev
7126 * devices to fail to get a link-local address.
7127 *
7128 * So, as a temporary fix, allocate the ipv6 structure for
7129 * loopback_dev first by hand.
7130 * Longer term, all of the dependencies ipv6 has upon the loopback
7131 * device and it being up should be removed.
7132 */
7133 rtnl_lock();
7134 idev = ipv6_add_dev(init_net.loopback_dev);
7135 rtnl_unlock();
7136 if (IS_ERR(idev)) {
7137 err = PTR_ERR(idev);
7138 goto errlo;
7139 }
7140
7141 ip6_route_init_special_entries();
7142
7143 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7144 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7145
7146 register_netdevice_notifier(&ipv6_dev_notf);
7147
7148 addrconf_verify();
7149
7150 rtnl_af_register(&inet6_ops);
7151
7152 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7153 NULL, inet6_dump_ifinfo, 0);
7154 if (err < 0)
7155 goto errout;
7156
7157 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7158 inet6_rtm_newaddr, NULL, 0);
7159 if (err < 0)
7160 goto errout;
7161 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7162 inet6_rtm_deladdr, NULL, 0);
7163 if (err < 0)
7164 goto errout;
7165 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7166 inet6_rtm_getaddr, inet6_dump_ifaddr,
7167 RTNL_FLAG_DOIT_UNLOCKED);
7168 if (err < 0)
7169 goto errout;
7170 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7171 NULL, inet6_dump_ifmcaddr, 0);
7172 if (err < 0)
7173 goto errout;
7174 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7175 NULL, inet6_dump_ifacaddr, 0);
7176 if (err < 0)
7177 goto errout;
7178 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7179 inet6_netconf_get_devconf,
7180 inet6_netconf_dump_devconf,
7181 RTNL_FLAG_DOIT_UNLOCKED);
7182 if (err < 0)
7183 goto errout;
7184 err = ipv6_addr_label_rtnl_register();
7185 if (err < 0)
7186 goto errout;
7187
7188 return 0;
7189 errout:
7190 rtnl_unregister_all(PF_INET6);
7191 rtnl_af_unregister(&inet6_ops);
7192 unregister_netdevice_notifier(&ipv6_dev_notf);
7193 errlo:
7194 destroy_workqueue(addrconf_wq);
7195 out_nowq:
7196 unregister_pernet_subsys(&addrconf_ops);
7197 out_addrlabel:
7198 ipv6_addr_label_cleanup();
7199 out:
7200 return err;
7201 }
7202
7203 void addrconf_cleanup(void)
7204 {
7205 struct net_device *dev;
7206 int i;
7207
7208 unregister_netdevice_notifier(&ipv6_dev_notf);
7209 unregister_pernet_subsys(&addrconf_ops);
7210 ipv6_addr_label_cleanup();
7211
7212 rtnl_af_unregister(&inet6_ops);
7213
7214 rtnl_lock();
7215
7216 /* clean dev list */
7217 for_each_netdev(&init_net, dev) {
7218 if (__in6_dev_get(dev) == NULL)
7219 continue;
7220 addrconf_ifdown(dev, true);
7221 }
7222 addrconf_ifdown(init_net.loopback_dev, true);
7223
7224 /*
7225 * Check hash table.
7226 */
7227 spin_lock_bh(&addrconf_hash_lock);
7228 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7229 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7230 spin_unlock_bh(&addrconf_hash_lock);
7231 cancel_delayed_work(&addr_chk_work);
7232 rtnl_unlock();
7233
7234 destroy_workqueue(addrconf_wq);
7235 }
Linux with added FPC-III support