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Merge tag 'asoc-v5.7' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie...
[mirror_ubuntu-hirsute-kernel.git] / net / ipv6 / addrconf.c
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_regen_rndid(struct inet6_dev *idev);
139 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
140
141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
142 static int ipv6_count_addresses(const struct inet6_dev *idev);
143 static int ipv6_generate_stable_address(struct in6_addr *addr,
144 u8 dad_count,
145 const struct inet6_dev *idev);
146
147 #define IN6_ADDR_HSIZE_SHIFT 8
148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
149 /*
150 * Configured unicast address hash table
151 */
152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
153 static DEFINE_SPINLOCK(addrconf_hash_lock);
154
155 static void addrconf_verify(void);
156 static void addrconf_verify_rtnl(void);
157 static void addrconf_verify_work(struct work_struct *);
158
159 static struct workqueue_struct *addrconf_wq;
160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
161
162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
164
165 static void addrconf_type_change(struct net_device *dev,
166 unsigned long event);
167 static int addrconf_ifdown(struct net_device *dev, int how);
168
169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
170 int plen,
171 const struct net_device *dev,
172 u32 flags, u32 noflags,
173 bool no_gw);
174
175 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
176 static void addrconf_dad_work(struct work_struct *w);
177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
178 bool send_na);
179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
180 static void addrconf_rs_timer(struct timer_list *t);
181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
183
184 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
185 struct prefix_info *pinfo);
186
187 static struct ipv6_devconf ipv6_devconf __read_mostly = {
188 .forwarding = 0,
189 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
190 .mtu6 = IPV6_MIN_MTU,
191 .accept_ra = 1,
192 .accept_redirects = 1,
193 .autoconf = 1,
194 .force_mld_version = 0,
195 .mldv1_unsolicited_report_interval = 10 * HZ,
196 .mldv2_unsolicited_report_interval = HZ,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207 .max_addresses = IPV6_MAX_ADDRESSES,
208 .accept_ra_defrtr = 1,
209 .accept_ra_from_local = 0,
210 .accept_ra_min_hop_limit= 1,
211 .accept_ra_pinfo = 1,
212 #ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
214 .rtr_probe_interval = 60 * HZ,
215 #ifdef CONFIG_IPV6_ROUTE_INFO
216 .accept_ra_rt_info_min_plen = 0,
217 .accept_ra_rt_info_max_plen = 0,
218 #endif
219 #endif
220 .proxy_ndp = 0,
221 .accept_source_route = 0, /* we do not accept RH0 by default. */
222 .disable_ipv6 = 0,
223 .accept_dad = 0,
224 .suppress_frag_ndisc = 1,
225 .accept_ra_mtu = 1,
226 .stable_secret = {
227 .initialized = false,
228 },
229 .use_oif_addrs_only = 0,
230 .ignore_routes_with_linkdown = 0,
231 .keep_addr_on_down = 0,
232 .seg6_enabled = 0,
233 #ifdef CONFIG_IPV6_SEG6_HMAC
234 .seg6_require_hmac = 0,
235 #endif
236 .enhanced_dad = 1,
237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
238 .disable_policy = 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 };
294
295 /* Check if link is ready: is it up and is a valid qdisc available */
296 static inline bool addrconf_link_ready(const struct net_device *dev)
297 {
298 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
299 }
300
301 static void addrconf_del_rs_timer(struct inet6_dev *idev)
302 {
303 if (del_timer(&idev->rs_timer))
304 __in6_dev_put(idev);
305 }
306
307 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
308 {
309 if (cancel_delayed_work(&ifp->dad_work))
310 __in6_ifa_put(ifp);
311 }
312
313 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
314 unsigned long when)
315 {
316 if (!timer_pending(&idev->rs_timer))
317 in6_dev_hold(idev);
318 mod_timer(&idev->rs_timer, jiffies + when);
319 }
320
321 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
322 unsigned long delay)
323 {
324 in6_ifa_hold(ifp);
325 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
326 in6_ifa_put(ifp);
327 }
328
329 static int snmp6_alloc_dev(struct inet6_dev *idev)
330 {
331 int i;
332
333 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
334 if (!idev->stats.ipv6)
335 goto err_ip;
336
337 for_each_possible_cpu(i) {
338 struct ipstats_mib *addrconf_stats;
339 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
340 u64_stats_init(&addrconf_stats->syncp);
341 }
342
343
344 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
345 GFP_KERNEL);
346 if (!idev->stats.icmpv6dev)
347 goto err_icmp;
348 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
349 GFP_KERNEL);
350 if (!idev->stats.icmpv6msgdev)
351 goto err_icmpmsg;
352
353 return 0;
354
355 err_icmpmsg:
356 kfree(idev->stats.icmpv6dev);
357 err_icmp:
358 free_percpu(idev->stats.ipv6);
359 err_ip:
360 return -ENOMEM;
361 }
362
363 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
364 {
365 struct inet6_dev *ndev;
366 int err = -ENOMEM;
367
368 ASSERT_RTNL();
369
370 if (dev->mtu < IPV6_MIN_MTU)
371 return ERR_PTR(-EINVAL);
372
373 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
374 if (!ndev)
375 return ERR_PTR(err);
376
377 rwlock_init(&ndev->lock);
378 ndev->dev = dev;
379 INIT_LIST_HEAD(&ndev->addr_list);
380 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
381 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
382
383 if (ndev->cnf.stable_secret.initialized)
384 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
385
386 ndev->cnf.mtu6 = dev->mtu;
387 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
388 if (!ndev->nd_parms) {
389 kfree(ndev);
390 return ERR_PTR(err);
391 }
392 if (ndev->cnf.forwarding)
393 dev_disable_lro(dev);
394 /* We refer to the device */
395 dev_hold(dev);
396
397 if (snmp6_alloc_dev(ndev) < 0) {
398 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
399 __func__);
400 neigh_parms_release(&nd_tbl, ndev->nd_parms);
401 dev_put(dev);
402 kfree(ndev);
403 return ERR_PTR(err);
404 }
405
406 if (snmp6_register_dev(ndev) < 0) {
407 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
408 __func__, dev->name);
409 goto err_release;
410 }
411
412 /* One reference from device. */
413 refcount_set(&ndev->refcnt, 1);
414
415 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
416 ndev->cnf.accept_dad = -1;
417
418 #if IS_ENABLED(CONFIG_IPV6_SIT)
419 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
420 pr_info("%s: Disabled Multicast RS\n", dev->name);
421 ndev->cnf.rtr_solicits = 0;
422 }
423 #endif
424
425 INIT_LIST_HEAD(&ndev->tempaddr_list);
426 ndev->desync_factor = U32_MAX;
427 if ((dev->flags&IFF_LOOPBACK) ||
428 dev->type == ARPHRD_TUNNEL ||
429 dev->type == ARPHRD_TUNNEL6 ||
430 dev->type == ARPHRD_SIT ||
431 dev->type == ARPHRD_NONE) {
432 ndev->cnf.use_tempaddr = -1;
433 } else
434 ipv6_regen_rndid(ndev);
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);
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,
1308 struct inet6_ifaddr *ift,
1309 bool block)
1310 {
1311 struct inet6_dev *idev = ifp->idev;
1312 struct in6_addr addr, *tmpaddr;
1313 unsigned long tmp_tstamp, age;
1314 unsigned long regen_advance;
1315 struct ifa6_config cfg;
1316 int ret = 0;
1317 unsigned long now = jiffies;
1318 long max_desync_factor;
1319 s32 cnf_temp_preferred_lft;
1320
1321 write_lock_bh(&idev->lock);
1322 if (ift) {
1323 spin_lock_bh(&ift->lock);
1324 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1325 spin_unlock_bh(&ift->lock);
1326 tmpaddr = &addr;
1327 } else {
1328 tmpaddr = NULL;
1329 }
1330 retry:
1331 in6_dev_hold(idev);
1332 if (idev->cnf.use_tempaddr <= 0) {
1333 write_unlock_bh(&idev->lock);
1334 pr_info("%s: use_tempaddr is disabled\n", __func__);
1335 in6_dev_put(idev);
1336 ret = -1;
1337 goto out;
1338 }
1339 spin_lock_bh(&ifp->lock);
1340 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1341 idev->cnf.use_tempaddr = -1; /*XXX*/
1342 spin_unlock_bh(&ifp->lock);
1343 write_unlock_bh(&idev->lock);
1344 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1345 __func__);
1346 in6_dev_put(idev);
1347 ret = -1;
1348 goto out;
1349 }
1350 in6_ifa_hold(ifp);
1351 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1352 ipv6_try_regen_rndid(idev, tmpaddr);
1353 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1354 age = (now - ifp->tstamp) / HZ;
1355
1356 regen_advance = idev->cnf.regen_max_retry *
1357 idev->cnf.dad_transmits *
1358 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1359
1360 /* recalculate max_desync_factor each time and update
1361 * idev->desync_factor if it's larger
1362 */
1363 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1364 max_desync_factor = min_t(__u32,
1365 idev->cnf.max_desync_factor,
1366 cnf_temp_preferred_lft - regen_advance);
1367
1368 if (unlikely(idev->desync_factor > max_desync_factor)) {
1369 if (max_desync_factor > 0) {
1370 get_random_bytes(&idev->desync_factor,
1371 sizeof(idev->desync_factor));
1372 idev->desync_factor %= max_desync_factor;
1373 } else {
1374 idev->desync_factor = 0;
1375 }
1376 }
1377
1378 memset(&cfg, 0, sizeof(cfg));
1379 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1380 idev->cnf.temp_valid_lft + age);
1381 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1382 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1383
1384 cfg.plen = ifp->prefix_len;
1385 tmp_tstamp = ifp->tstamp;
1386 spin_unlock_bh(&ifp->lock);
1387
1388 write_unlock_bh(&idev->lock);
1389
1390 /* A temporary address is created only if this calculated Preferred
1391 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1392 * an implementation must not create a temporary address with a zero
1393 * Preferred Lifetime.
1394 * Use age calculation as in addrconf_verify to avoid unnecessary
1395 * temporary addresses being generated.
1396 */
1397 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1398 if (cfg.preferred_lft <= regen_advance + age) {
1399 in6_ifa_put(ifp);
1400 in6_dev_put(idev);
1401 ret = -1;
1402 goto out;
1403 }
1404
1405 cfg.ifa_flags = IFA_F_TEMPORARY;
1406 /* set in addrconf_prefix_rcv() */
1407 if (ifp->flags & IFA_F_OPTIMISTIC)
1408 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1409
1410 cfg.pfx = &addr;
1411 cfg.scope = ipv6_addr_scope(cfg.pfx);
1412
1413 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1414 if (IS_ERR(ift)) {
1415 in6_ifa_put(ifp);
1416 in6_dev_put(idev);
1417 pr_info("%s: retry temporary address regeneration\n", __func__);
1418 tmpaddr = &addr;
1419 write_lock_bh(&idev->lock);
1420 goto retry;
1421 }
1422
1423 spin_lock_bh(&ift->lock);
1424 ift->ifpub = ifp;
1425 ift->cstamp = now;
1426 ift->tstamp = tmp_tstamp;
1427 spin_unlock_bh(&ift->lock);
1428
1429 addrconf_dad_start(ift);
1430 in6_ifa_put(ift);
1431 in6_dev_put(idev);
1432 out:
1433 return ret;
1434 }
1435
1436 /*
1437 * Choose an appropriate source address (RFC3484)
1438 */
1439 enum {
1440 IPV6_SADDR_RULE_INIT = 0,
1441 IPV6_SADDR_RULE_LOCAL,
1442 IPV6_SADDR_RULE_SCOPE,
1443 IPV6_SADDR_RULE_PREFERRED,
1444 #ifdef CONFIG_IPV6_MIP6
1445 IPV6_SADDR_RULE_HOA,
1446 #endif
1447 IPV6_SADDR_RULE_OIF,
1448 IPV6_SADDR_RULE_LABEL,
1449 IPV6_SADDR_RULE_PRIVACY,
1450 IPV6_SADDR_RULE_ORCHID,
1451 IPV6_SADDR_RULE_PREFIX,
1452 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1453 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1454 #endif
1455 IPV6_SADDR_RULE_MAX
1456 };
1457
1458 struct ipv6_saddr_score {
1459 int rule;
1460 int addr_type;
1461 struct inet6_ifaddr *ifa;
1462 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1463 int scopedist;
1464 int matchlen;
1465 };
1466
1467 struct ipv6_saddr_dst {
1468 const struct in6_addr *addr;
1469 int ifindex;
1470 int scope;
1471 int label;
1472 unsigned int prefs;
1473 };
1474
1475 static inline int ipv6_saddr_preferred(int type)
1476 {
1477 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1478 return 1;
1479 return 0;
1480 }
1481
1482 static bool ipv6_use_optimistic_addr(struct net *net,
1483 struct inet6_dev *idev)
1484 {
1485 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1486 if (!idev)
1487 return false;
1488 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1489 return false;
1490 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1491 return false;
1492
1493 return true;
1494 #else
1495 return false;
1496 #endif
1497 }
1498
1499 static bool ipv6_allow_optimistic_dad(struct net *net,
1500 struct inet6_dev *idev)
1501 {
1502 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1503 if (!idev)
1504 return false;
1505 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1506 return false;
1507
1508 return true;
1509 #else
1510 return false;
1511 #endif
1512 }
1513
1514 static int ipv6_get_saddr_eval(struct net *net,
1515 struct ipv6_saddr_score *score,
1516 struct ipv6_saddr_dst *dst,
1517 int i)
1518 {
1519 int ret;
1520
1521 if (i <= score->rule) {
1522 switch (i) {
1523 case IPV6_SADDR_RULE_SCOPE:
1524 ret = score->scopedist;
1525 break;
1526 case IPV6_SADDR_RULE_PREFIX:
1527 ret = score->matchlen;
1528 break;
1529 default:
1530 ret = !!test_bit(i, score->scorebits);
1531 }
1532 goto out;
1533 }
1534
1535 switch (i) {
1536 case IPV6_SADDR_RULE_INIT:
1537 /* Rule 0: remember if hiscore is not ready yet */
1538 ret = !!score->ifa;
1539 break;
1540 case IPV6_SADDR_RULE_LOCAL:
1541 /* Rule 1: Prefer same address */
1542 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1543 break;
1544 case IPV6_SADDR_RULE_SCOPE:
1545 /* Rule 2: Prefer appropriate scope
1546 *
1547 * ret
1548 * ^
1549 * -1 | d 15
1550 * ---+--+-+---> scope
1551 * |
1552 * | d is scope of the destination.
1553 * B-d | \
1554 * | \ <- smaller scope is better if
1555 * B-15 | \ if scope is enough for destination.
1556 * | ret = B - scope (-1 <= scope >= d <= 15).
1557 * d-C-1 | /
1558 * |/ <- greater is better
1559 * -C / if scope is not enough for destination.
1560 * /| ret = scope - C (-1 <= d < scope <= 15).
1561 *
1562 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1563 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1564 * Assume B = 0 and we get C > 29.
1565 */
1566 ret = __ipv6_addr_src_scope(score->addr_type);
1567 if (ret >= dst->scope)
1568 ret = -ret;
1569 else
1570 ret -= 128; /* 30 is enough */
1571 score->scopedist = ret;
1572 break;
1573 case IPV6_SADDR_RULE_PREFERRED:
1574 {
1575 /* Rule 3: Avoid deprecated and optimistic addresses */
1576 u8 avoid = IFA_F_DEPRECATED;
1577
1578 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1579 avoid |= IFA_F_OPTIMISTIC;
1580 ret = ipv6_saddr_preferred(score->addr_type) ||
1581 !(score->ifa->flags & avoid);
1582 break;
1583 }
1584 #ifdef CONFIG_IPV6_MIP6
1585 case IPV6_SADDR_RULE_HOA:
1586 {
1587 /* Rule 4: Prefer home address */
1588 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1589 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1590 break;
1591 }
1592 #endif
1593 case IPV6_SADDR_RULE_OIF:
1594 /* Rule 5: Prefer outgoing interface */
1595 ret = (!dst->ifindex ||
1596 dst->ifindex == score->ifa->idev->dev->ifindex);
1597 break;
1598 case IPV6_SADDR_RULE_LABEL:
1599 /* Rule 6: Prefer matching label */
1600 ret = ipv6_addr_label(net,
1601 &score->ifa->addr, score->addr_type,
1602 score->ifa->idev->dev->ifindex) == dst->label;
1603 break;
1604 case IPV6_SADDR_RULE_PRIVACY:
1605 {
1606 /* Rule 7: Prefer public address
1607 * Note: prefer temporary address if use_tempaddr >= 2
1608 */
1609 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1610 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1611 score->ifa->idev->cnf.use_tempaddr >= 2;
1612 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1613 break;
1614 }
1615 case IPV6_SADDR_RULE_ORCHID:
1616 /* Rule 8-: Prefer ORCHID vs ORCHID or
1617 * non-ORCHID vs non-ORCHID
1618 */
1619 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1620 ipv6_addr_orchid(dst->addr));
1621 break;
1622 case IPV6_SADDR_RULE_PREFIX:
1623 /* Rule 8: Use longest matching prefix */
1624 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1625 if (ret > score->ifa->prefix_len)
1626 ret = score->ifa->prefix_len;
1627 score->matchlen = ret;
1628 break;
1629 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1630 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1631 /* Optimistic addresses still have lower precedence than other
1632 * preferred addresses.
1633 */
1634 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1635 break;
1636 #endif
1637 default:
1638 ret = 0;
1639 }
1640
1641 if (ret)
1642 __set_bit(i, score->scorebits);
1643 score->rule = i;
1644 out:
1645 return ret;
1646 }
1647
1648 static int __ipv6_dev_get_saddr(struct net *net,
1649 struct ipv6_saddr_dst *dst,
1650 struct inet6_dev *idev,
1651 struct ipv6_saddr_score *scores,
1652 int hiscore_idx)
1653 {
1654 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1655
1656 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1657 int i;
1658
1659 /*
1660 * - Tentative Address (RFC2462 section 5.4)
1661 * - A tentative address is not considered
1662 * "assigned to an interface" in the traditional
1663 * sense, unless it is also flagged as optimistic.
1664 * - Candidate Source Address (section 4)
1665 * - In any case, anycast addresses, multicast
1666 * addresses, and the unspecified address MUST
1667 * NOT be included in a candidate set.
1668 */
1669 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1670 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1671 continue;
1672
1673 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1674
1675 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1676 score->addr_type & IPV6_ADDR_MULTICAST)) {
1677 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1678 idev->dev->name);
1679 continue;
1680 }
1681
1682 score->rule = -1;
1683 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1684
1685 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1686 int minihiscore, miniscore;
1687
1688 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1689 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1690
1691 if (minihiscore > miniscore) {
1692 if (i == IPV6_SADDR_RULE_SCOPE &&
1693 score->scopedist > 0) {
1694 /*
1695 * special case:
1696 * each remaining entry
1697 * has too small (not enough)
1698 * scope, because ifa entries
1699 * are sorted by their scope
1700 * values.
1701 */
1702 goto out;
1703 }
1704 break;
1705 } else if (minihiscore < miniscore) {
1706 swap(hiscore, score);
1707 hiscore_idx = 1 - hiscore_idx;
1708
1709 /* restore our iterator */
1710 score->ifa = hiscore->ifa;
1711
1712 break;
1713 }
1714 }
1715 }
1716 out:
1717 return hiscore_idx;
1718 }
1719
1720 static int ipv6_get_saddr_master(struct net *net,
1721 const struct net_device *dst_dev,
1722 const struct net_device *master,
1723 struct ipv6_saddr_dst *dst,
1724 struct ipv6_saddr_score *scores,
1725 int hiscore_idx)
1726 {
1727 struct inet6_dev *idev;
1728
1729 idev = __in6_dev_get(dst_dev);
1730 if (idev)
1731 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1732 scores, hiscore_idx);
1733
1734 idev = __in6_dev_get(master);
1735 if (idev)
1736 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1737 scores, hiscore_idx);
1738
1739 return hiscore_idx;
1740 }
1741
1742 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1743 const struct in6_addr *daddr, unsigned int prefs,
1744 struct in6_addr *saddr)
1745 {
1746 struct ipv6_saddr_score scores[2], *hiscore;
1747 struct ipv6_saddr_dst dst;
1748 struct inet6_dev *idev;
1749 struct net_device *dev;
1750 int dst_type;
1751 bool use_oif_addr = false;
1752 int hiscore_idx = 0;
1753 int ret = 0;
1754
1755 dst_type = __ipv6_addr_type(daddr);
1756 dst.addr = daddr;
1757 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1758 dst.scope = __ipv6_addr_src_scope(dst_type);
1759 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1760 dst.prefs = prefs;
1761
1762 scores[hiscore_idx].rule = -1;
1763 scores[hiscore_idx].ifa = NULL;
1764
1765 rcu_read_lock();
1766
1767 /* Candidate Source Address (section 4)
1768 * - multicast and link-local destination address,
1769 * the set of candidate source address MUST only
1770 * include addresses assigned to interfaces
1771 * belonging to the same link as the outgoing
1772 * interface.
1773 * (- For site-local destination addresses, the
1774 * set of candidate source addresses MUST only
1775 * include addresses assigned to interfaces
1776 * belonging to the same site as the outgoing
1777 * interface.)
1778 * - "It is RECOMMENDED that the candidate source addresses
1779 * be the set of unicast addresses assigned to the
1780 * interface that will be used to send to the destination
1781 * (the 'outgoing' interface)." (RFC 6724)
1782 */
1783 if (dst_dev) {
1784 idev = __in6_dev_get(dst_dev);
1785 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1786 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1787 (idev && idev->cnf.use_oif_addrs_only)) {
1788 use_oif_addr = true;
1789 }
1790 }
1791
1792 if (use_oif_addr) {
1793 if (idev)
1794 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1795 } else {
1796 const struct net_device *master;
1797 int master_idx = 0;
1798
1799 /* if dst_dev exists and is enslaved to an L3 device, then
1800 * prefer addresses from dst_dev and then the master over
1801 * any other enslaved devices in the L3 domain.
1802 */
1803 master = l3mdev_master_dev_rcu(dst_dev);
1804 if (master) {
1805 master_idx = master->ifindex;
1806
1807 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1808 master, &dst,
1809 scores, hiscore_idx);
1810
1811 if (scores[hiscore_idx].ifa)
1812 goto out;
1813 }
1814
1815 for_each_netdev_rcu(net, dev) {
1816 /* only consider addresses on devices in the
1817 * same L3 domain
1818 */
1819 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1820 continue;
1821 idev = __in6_dev_get(dev);
1822 if (!idev)
1823 continue;
1824 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1825 }
1826 }
1827
1828 out:
1829 hiscore = &scores[hiscore_idx];
1830 if (!hiscore->ifa)
1831 ret = -EADDRNOTAVAIL;
1832 else
1833 *saddr = hiscore->ifa->addr;
1834
1835 rcu_read_unlock();
1836 return ret;
1837 }
1838 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1839
1840 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1841 u32 banned_flags)
1842 {
1843 struct inet6_ifaddr *ifp;
1844 int err = -EADDRNOTAVAIL;
1845
1846 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1847 if (ifp->scope > IFA_LINK)
1848 break;
1849 if (ifp->scope == IFA_LINK &&
1850 !(ifp->flags & banned_flags)) {
1851 *addr = ifp->addr;
1852 err = 0;
1853 break;
1854 }
1855 }
1856 return err;
1857 }
1858
1859 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1860 u32 banned_flags)
1861 {
1862 struct inet6_dev *idev;
1863 int err = -EADDRNOTAVAIL;
1864
1865 rcu_read_lock();
1866 idev = __in6_dev_get(dev);
1867 if (idev) {
1868 read_lock_bh(&idev->lock);
1869 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1870 read_unlock_bh(&idev->lock);
1871 }
1872 rcu_read_unlock();
1873 return err;
1874 }
1875
1876 static int ipv6_count_addresses(const struct inet6_dev *idev)
1877 {
1878 const struct inet6_ifaddr *ifp;
1879 int cnt = 0;
1880
1881 rcu_read_lock();
1882 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1883 cnt++;
1884 rcu_read_unlock();
1885 return cnt;
1886 }
1887
1888 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1889 const struct net_device *dev, int strict)
1890 {
1891 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1892 strict, IFA_F_TENTATIVE);
1893 }
1894 EXPORT_SYMBOL(ipv6_chk_addr);
1895
1896 /* device argument is used to find the L3 domain of interest. If
1897 * skip_dev_check is set, then the ifp device is not checked against
1898 * the passed in dev argument. So the 2 cases for addresses checks are:
1899 * 1. does the address exist in the L3 domain that dev is part of
1900 * (skip_dev_check = true), or
1901 *
1902 * 2. does the address exist on the specific device
1903 * (skip_dev_check = false)
1904 */
1905 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1906 const struct net_device *dev, bool skip_dev_check,
1907 int strict, u32 banned_flags)
1908 {
1909 unsigned int hash = inet6_addr_hash(net, addr);
1910 const struct net_device *l3mdev;
1911 struct inet6_ifaddr *ifp;
1912 u32 ifp_flags;
1913
1914 rcu_read_lock();
1915
1916 l3mdev = l3mdev_master_dev_rcu(dev);
1917 if (skip_dev_check)
1918 dev = NULL;
1919
1920 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1921 if (!net_eq(dev_net(ifp->idev->dev), net))
1922 continue;
1923
1924 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1925 continue;
1926
1927 /* Decouple optimistic from tentative for evaluation here.
1928 * Ban optimistic addresses explicitly, when required.
1929 */
1930 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1931 ? (ifp->flags&~IFA_F_TENTATIVE)
1932 : ifp->flags;
1933 if (ipv6_addr_equal(&ifp->addr, addr) &&
1934 !(ifp_flags&banned_flags) &&
1935 (!dev || ifp->idev->dev == dev ||
1936 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1937 rcu_read_unlock();
1938 return 1;
1939 }
1940 }
1941
1942 rcu_read_unlock();
1943 return 0;
1944 }
1945 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1946
1947
1948 /* Compares an address/prefix_len with addresses on device @dev.
1949 * If one is found it returns true.
1950 */
1951 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1952 const unsigned int prefix_len, struct net_device *dev)
1953 {
1954 const struct inet6_ifaddr *ifa;
1955 const struct inet6_dev *idev;
1956 bool ret = false;
1957
1958 rcu_read_lock();
1959 idev = __in6_dev_get(dev);
1960 if (idev) {
1961 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1962 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1963 if (ret)
1964 break;
1965 }
1966 }
1967 rcu_read_unlock();
1968
1969 return ret;
1970 }
1971 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1972
1973 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1974 {
1975 const struct inet6_ifaddr *ifa;
1976 const struct inet6_dev *idev;
1977 int onlink;
1978
1979 onlink = 0;
1980 rcu_read_lock();
1981 idev = __in6_dev_get(dev);
1982 if (idev) {
1983 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1984 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1985 ifa->prefix_len);
1986 if (onlink)
1987 break;
1988 }
1989 }
1990 rcu_read_unlock();
1991 return onlink;
1992 }
1993 EXPORT_SYMBOL(ipv6_chk_prefix);
1994
1995 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1996 struct net_device *dev, int strict)
1997 {
1998 unsigned int hash = inet6_addr_hash(net, addr);
1999 struct inet6_ifaddr *ifp, *result = NULL;
2000
2001 rcu_read_lock();
2002 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2003 if (!net_eq(dev_net(ifp->idev->dev), net))
2004 continue;
2005 if (ipv6_addr_equal(&ifp->addr, addr)) {
2006 if (!dev || ifp->idev->dev == dev ||
2007 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2008 result = ifp;
2009 in6_ifa_hold(ifp);
2010 break;
2011 }
2012 }
2013 }
2014 rcu_read_unlock();
2015
2016 return result;
2017 }
2018
2019 /* Gets referenced address, destroys ifaddr */
2020
2021 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2022 {
2023 if (dad_failed)
2024 ifp->flags |= IFA_F_DADFAILED;
2025
2026 if (ifp->flags&IFA_F_TEMPORARY) {
2027 struct inet6_ifaddr *ifpub;
2028 spin_lock_bh(&ifp->lock);
2029 ifpub = ifp->ifpub;
2030 if (ifpub) {
2031 in6_ifa_hold(ifpub);
2032 spin_unlock_bh(&ifp->lock);
2033 ipv6_create_tempaddr(ifpub, ifp, true);
2034 in6_ifa_put(ifpub);
2035 } else {
2036 spin_unlock_bh(&ifp->lock);
2037 }
2038 ipv6_del_addr(ifp);
2039 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2040 spin_lock_bh(&ifp->lock);
2041 addrconf_del_dad_work(ifp);
2042 ifp->flags |= IFA_F_TENTATIVE;
2043 if (dad_failed)
2044 ifp->flags &= ~IFA_F_OPTIMISTIC;
2045 spin_unlock_bh(&ifp->lock);
2046 if (dad_failed)
2047 ipv6_ifa_notify(0, ifp);
2048 in6_ifa_put(ifp);
2049 } else {
2050 ipv6_del_addr(ifp);
2051 }
2052 }
2053
2054 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2055 {
2056 int err = -ENOENT;
2057
2058 spin_lock_bh(&ifp->lock);
2059 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2060 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2061 err = 0;
2062 }
2063 spin_unlock_bh(&ifp->lock);
2064
2065 return err;
2066 }
2067
2068 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2069 {
2070 struct inet6_dev *idev = ifp->idev;
2071 struct net *net = dev_net(ifp->idev->dev);
2072
2073 if (addrconf_dad_end(ifp)) {
2074 in6_ifa_put(ifp);
2075 return;
2076 }
2077
2078 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2079 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2080
2081 spin_lock_bh(&ifp->lock);
2082
2083 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2084 struct in6_addr new_addr;
2085 struct inet6_ifaddr *ifp2;
2086 int retries = ifp->stable_privacy_retry + 1;
2087 struct ifa6_config cfg = {
2088 .pfx = &new_addr,
2089 .plen = ifp->prefix_len,
2090 .ifa_flags = ifp->flags,
2091 .valid_lft = ifp->valid_lft,
2092 .preferred_lft = ifp->prefered_lft,
2093 .scope = ifp->scope,
2094 };
2095
2096 if (retries > net->ipv6.sysctl.idgen_retries) {
2097 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2098 ifp->idev->dev->name);
2099 goto errdad;
2100 }
2101
2102 new_addr = ifp->addr;
2103 if (ipv6_generate_stable_address(&new_addr, retries,
2104 idev))
2105 goto errdad;
2106
2107 spin_unlock_bh(&ifp->lock);
2108
2109 if (idev->cnf.max_addresses &&
2110 ipv6_count_addresses(idev) >=
2111 idev->cnf.max_addresses)
2112 goto lock_errdad;
2113
2114 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2115 ifp->idev->dev->name);
2116
2117 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2118 if (IS_ERR(ifp2))
2119 goto lock_errdad;
2120
2121 spin_lock_bh(&ifp2->lock);
2122 ifp2->stable_privacy_retry = retries;
2123 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2124 spin_unlock_bh(&ifp2->lock);
2125
2126 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2127 in6_ifa_put(ifp2);
2128 lock_errdad:
2129 spin_lock_bh(&ifp->lock);
2130 }
2131
2132 errdad:
2133 /* transition from _POSTDAD to _ERRDAD */
2134 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2135 spin_unlock_bh(&ifp->lock);
2136
2137 addrconf_mod_dad_work(ifp, 0);
2138 in6_ifa_put(ifp);
2139 }
2140
2141 /* Join to solicited addr multicast group.
2142 * caller must hold RTNL */
2143 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2144 {
2145 struct in6_addr maddr;
2146
2147 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2148 return;
2149
2150 addrconf_addr_solict_mult(addr, &maddr);
2151 ipv6_dev_mc_inc(dev, &maddr);
2152 }
2153
2154 /* caller must hold RTNL */
2155 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2156 {
2157 struct in6_addr maddr;
2158
2159 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2160 return;
2161
2162 addrconf_addr_solict_mult(addr, &maddr);
2163 __ipv6_dev_mc_dec(idev, &maddr);
2164 }
2165
2166 /* caller must hold RTNL */
2167 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2168 {
2169 struct in6_addr addr;
2170
2171 if (ifp->prefix_len >= 127) /* RFC 6164 */
2172 return;
2173 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2174 if (ipv6_addr_any(&addr))
2175 return;
2176 __ipv6_dev_ac_inc(ifp->idev, &addr);
2177 }
2178
2179 /* caller must hold RTNL */
2180 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2181 {
2182 struct in6_addr addr;
2183
2184 if (ifp->prefix_len >= 127) /* RFC 6164 */
2185 return;
2186 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2187 if (ipv6_addr_any(&addr))
2188 return;
2189 __ipv6_dev_ac_dec(ifp->idev, &addr);
2190 }
2191
2192 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2193 {
2194 switch (dev->addr_len) {
2195 case ETH_ALEN:
2196 memcpy(eui, dev->dev_addr, 3);
2197 eui[3] = 0xFF;
2198 eui[4] = 0xFE;
2199 memcpy(eui + 5, dev->dev_addr + 3, 3);
2200 break;
2201 case EUI64_ADDR_LEN:
2202 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2203 eui[0] ^= 2;
2204 break;
2205 default:
2206 return -1;
2207 }
2208
2209 return 0;
2210 }
2211
2212 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2213 {
2214 union fwnet_hwaddr *ha;
2215
2216 if (dev->addr_len != FWNET_ALEN)
2217 return -1;
2218
2219 ha = (union fwnet_hwaddr *)dev->dev_addr;
2220
2221 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2222 eui[0] ^= 2;
2223 return 0;
2224 }
2225
2226 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2227 {
2228 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2229 if (dev->addr_len != ARCNET_ALEN)
2230 return -1;
2231 memset(eui, 0, 7);
2232 eui[7] = *(u8 *)dev->dev_addr;
2233 return 0;
2234 }
2235
2236 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2237 {
2238 if (dev->addr_len != INFINIBAND_ALEN)
2239 return -1;
2240 memcpy(eui, dev->dev_addr + 12, 8);
2241 eui[0] |= 2;
2242 return 0;
2243 }
2244
2245 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2246 {
2247 if (addr == 0)
2248 return -1;
2249 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2250 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2251 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2252 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2253 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2254 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2255 eui[1] = 0;
2256 eui[2] = 0x5E;
2257 eui[3] = 0xFE;
2258 memcpy(eui + 4, &addr, 4);
2259 return 0;
2260 }
2261
2262 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2263 {
2264 if (dev->priv_flags & IFF_ISATAP)
2265 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2266 return -1;
2267 }
2268
2269 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2270 {
2271 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2272 }
2273
2274 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2275 {
2276 memcpy(eui, dev->perm_addr, 3);
2277 memcpy(eui + 5, dev->perm_addr + 3, 3);
2278 eui[3] = 0xFF;
2279 eui[4] = 0xFE;
2280 eui[0] ^= 2;
2281 return 0;
2282 }
2283
2284 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2285 {
2286 switch (dev->type) {
2287 case ARPHRD_ETHER:
2288 case ARPHRD_FDDI:
2289 return addrconf_ifid_eui48(eui, dev);
2290 case ARPHRD_ARCNET:
2291 return addrconf_ifid_arcnet(eui, dev);
2292 case ARPHRD_INFINIBAND:
2293 return addrconf_ifid_infiniband(eui, dev);
2294 case ARPHRD_SIT:
2295 return addrconf_ifid_sit(eui, dev);
2296 case ARPHRD_IPGRE:
2297 case ARPHRD_TUNNEL:
2298 return addrconf_ifid_gre(eui, dev);
2299 case ARPHRD_6LOWPAN:
2300 return addrconf_ifid_6lowpan(eui, dev);
2301 case ARPHRD_IEEE1394:
2302 return addrconf_ifid_ieee1394(eui, dev);
2303 case ARPHRD_TUNNEL6:
2304 case ARPHRD_IP6GRE:
2305 case ARPHRD_RAWIP:
2306 return addrconf_ifid_ip6tnl(eui, dev);
2307 }
2308 return -1;
2309 }
2310
2311 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2312 {
2313 int err = -1;
2314 struct inet6_ifaddr *ifp;
2315
2316 read_lock_bh(&idev->lock);
2317 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2318 if (ifp->scope > IFA_LINK)
2319 break;
2320 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2321 memcpy(eui, ifp->addr.s6_addr+8, 8);
2322 err = 0;
2323 break;
2324 }
2325 }
2326 read_unlock_bh(&idev->lock);
2327 return err;
2328 }
2329
2330 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2331 static void ipv6_regen_rndid(struct inet6_dev *idev)
2332 {
2333 regen:
2334 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2335 idev->rndid[0] &= ~0x02;
2336
2337 /*
2338 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2339 * check if generated address is not inappropriate
2340 *
2341 * - Reserved subnet anycast (RFC 2526)
2342 * 11111101 11....11 1xxxxxxx
2343 * - ISATAP (RFC4214) 6.1
2344 * 00-00-5E-FE-xx-xx-xx-xx
2345 * - value 0
2346 * - XXX: already assigned to an address on the device
2347 */
2348 if (idev->rndid[0] == 0xfd &&
2349 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2350 (idev->rndid[7]&0x80))
2351 goto regen;
2352 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2353 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2354 goto regen;
2355 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2356 goto regen;
2357 }
2358 }
2359
2360 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2361 {
2362 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2363 ipv6_regen_rndid(idev);
2364 }
2365
2366 /*
2367 * Add prefix route.
2368 */
2369
2370 static void
2371 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2372 struct net_device *dev, unsigned long expires,
2373 u32 flags, gfp_t gfp_flags)
2374 {
2375 struct fib6_config cfg = {
2376 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2377 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2378 .fc_ifindex = dev->ifindex,
2379 .fc_expires = expires,
2380 .fc_dst_len = plen,
2381 .fc_flags = RTF_UP | flags,
2382 .fc_nlinfo.nl_net = dev_net(dev),
2383 .fc_protocol = RTPROT_KERNEL,
2384 .fc_type = RTN_UNICAST,
2385 };
2386
2387 cfg.fc_dst = *pfx;
2388
2389 /* Prevent useless cloning on PtP SIT.
2390 This thing is done here expecting that the whole
2391 class of non-broadcast devices need not cloning.
2392 */
2393 #if IS_ENABLED(CONFIG_IPV6_SIT)
2394 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2395 cfg.fc_flags |= RTF_NONEXTHOP;
2396 #endif
2397
2398 ip6_route_add(&cfg, gfp_flags, NULL);
2399 }
2400
2401
2402 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2403 int plen,
2404 const struct net_device *dev,
2405 u32 flags, u32 noflags,
2406 bool no_gw)
2407 {
2408 struct fib6_node *fn;
2409 struct fib6_info *rt = NULL;
2410 struct fib6_table *table;
2411 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2412
2413 table = fib6_get_table(dev_net(dev), tb_id);
2414 if (!table)
2415 return NULL;
2416
2417 rcu_read_lock();
2418 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2419 if (!fn)
2420 goto out;
2421
2422 for_each_fib6_node_rt_rcu(fn) {
2423 /* prefix routes only use builtin fib6_nh */
2424 if (rt->nh)
2425 continue;
2426
2427 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2428 continue;
2429 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2430 continue;
2431 if ((rt->fib6_flags & flags) != flags)
2432 continue;
2433 if ((rt->fib6_flags & noflags) != 0)
2434 continue;
2435 if (!fib6_info_hold_safe(rt))
2436 continue;
2437 break;
2438 }
2439 out:
2440 rcu_read_unlock();
2441 return rt;
2442 }
2443
2444
2445 /* Create "default" multicast route to the interface */
2446
2447 static void addrconf_add_mroute(struct net_device *dev)
2448 {
2449 struct fib6_config cfg = {
2450 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2451 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2452 .fc_ifindex = dev->ifindex,
2453 .fc_dst_len = 8,
2454 .fc_flags = RTF_UP,
2455 .fc_type = RTN_UNICAST,
2456 .fc_nlinfo.nl_net = dev_net(dev),
2457 };
2458
2459 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2460
2461 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2462 }
2463
2464 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2465 {
2466 struct inet6_dev *idev;
2467
2468 ASSERT_RTNL();
2469
2470 idev = ipv6_find_idev(dev);
2471 if (IS_ERR(idev))
2472 return idev;
2473
2474 if (idev->cnf.disable_ipv6)
2475 return ERR_PTR(-EACCES);
2476
2477 /* Add default multicast route */
2478 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2479 addrconf_add_mroute(dev);
2480
2481 return idev;
2482 }
2483
2484 static void manage_tempaddrs(struct inet6_dev *idev,
2485 struct inet6_ifaddr *ifp,
2486 __u32 valid_lft, __u32 prefered_lft,
2487 bool create, unsigned long now)
2488 {
2489 u32 flags;
2490 struct inet6_ifaddr *ift;
2491
2492 read_lock_bh(&idev->lock);
2493 /* update all temporary addresses in the list */
2494 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2495 int age, max_valid, max_prefered;
2496
2497 if (ifp != ift->ifpub)
2498 continue;
2499
2500 /* RFC 4941 section 3.3:
2501 * If a received option will extend the lifetime of a public
2502 * address, the lifetimes of temporary addresses should
2503 * be extended, subject to the overall constraint that no
2504 * temporary addresses should ever remain "valid" or "preferred"
2505 * for a time longer than (TEMP_VALID_LIFETIME) or
2506 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2507 */
2508 age = (now - ift->cstamp) / HZ;
2509 max_valid = idev->cnf.temp_valid_lft - age;
2510 if (max_valid < 0)
2511 max_valid = 0;
2512
2513 max_prefered = idev->cnf.temp_prefered_lft -
2514 idev->desync_factor - age;
2515 if (max_prefered < 0)
2516 max_prefered = 0;
2517
2518 if (valid_lft > max_valid)
2519 valid_lft = max_valid;
2520
2521 if (prefered_lft > max_prefered)
2522 prefered_lft = max_prefered;
2523
2524 spin_lock(&ift->lock);
2525 flags = ift->flags;
2526 ift->valid_lft = valid_lft;
2527 ift->prefered_lft = prefered_lft;
2528 ift->tstamp = now;
2529 if (prefered_lft > 0)
2530 ift->flags &= ~IFA_F_DEPRECATED;
2531
2532 spin_unlock(&ift->lock);
2533 if (!(flags&IFA_F_TENTATIVE))
2534 ipv6_ifa_notify(0, ift);
2535 }
2536
2537 if ((create || list_empty(&idev->tempaddr_list)) &&
2538 idev->cnf.use_tempaddr > 0) {
2539 /* When a new public address is created as described
2540 * in [ADDRCONF], also create a new temporary address.
2541 * Also create a temporary address if it's enabled but
2542 * no temporary address currently exists.
2543 */
2544 read_unlock_bh(&idev->lock);
2545 ipv6_create_tempaddr(ifp, NULL, false);
2546 } else {
2547 read_unlock_bh(&idev->lock);
2548 }
2549 }
2550
2551 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2552 {
2553 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2554 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2555 }
2556
2557 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2558 const struct prefix_info *pinfo,
2559 struct inet6_dev *in6_dev,
2560 const struct in6_addr *addr, int addr_type,
2561 u32 addr_flags, bool sllao, bool tokenized,
2562 __u32 valid_lft, u32 prefered_lft)
2563 {
2564 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2565 int create = 0, update_lft = 0;
2566
2567 if (!ifp && valid_lft) {
2568 int max_addresses = in6_dev->cnf.max_addresses;
2569 struct ifa6_config cfg = {
2570 .pfx = addr,
2571 .plen = pinfo->prefix_len,
2572 .ifa_flags = addr_flags,
2573 .valid_lft = valid_lft,
2574 .preferred_lft = prefered_lft,
2575 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2576 };
2577
2578 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2579 if ((net->ipv6.devconf_all->optimistic_dad ||
2580 in6_dev->cnf.optimistic_dad) &&
2581 !net->ipv6.devconf_all->forwarding && sllao)
2582 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2583 #endif
2584
2585 /* Do not allow to create too much of autoconfigured
2586 * addresses; this would be too easy way to crash kernel.
2587 */
2588 if (!max_addresses ||
2589 ipv6_count_addresses(in6_dev) < max_addresses)
2590 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2591
2592 if (IS_ERR_OR_NULL(ifp))
2593 return -1;
2594
2595 create = 1;
2596 spin_lock_bh(&ifp->lock);
2597 ifp->flags |= IFA_F_MANAGETEMPADDR;
2598 ifp->cstamp = jiffies;
2599 ifp->tokenized = tokenized;
2600 spin_unlock_bh(&ifp->lock);
2601 addrconf_dad_start(ifp);
2602 }
2603
2604 if (ifp) {
2605 u32 flags;
2606 unsigned long now;
2607 u32 stored_lft;
2608
2609 /* update lifetime (RFC2462 5.5.3 e) */
2610 spin_lock_bh(&ifp->lock);
2611 now = jiffies;
2612 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2613 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2614 else
2615 stored_lft = 0;
2616 if (!create && stored_lft) {
2617 const u32 minimum_lft = min_t(u32,
2618 stored_lft, MIN_VALID_LIFETIME);
2619 valid_lft = max(valid_lft, minimum_lft);
2620
2621 /* RFC4862 Section 5.5.3e:
2622 * "Note that the preferred lifetime of the
2623 * corresponding address is always reset to
2624 * the Preferred Lifetime in the received
2625 * Prefix Information option, regardless of
2626 * whether the valid lifetime is also reset or
2627 * ignored."
2628 *
2629 * So we should always update prefered_lft here.
2630 */
2631 update_lft = 1;
2632 }
2633
2634 if (update_lft) {
2635 ifp->valid_lft = valid_lft;
2636 ifp->prefered_lft = prefered_lft;
2637 ifp->tstamp = now;
2638 flags = ifp->flags;
2639 ifp->flags &= ~IFA_F_DEPRECATED;
2640 spin_unlock_bh(&ifp->lock);
2641
2642 if (!(flags&IFA_F_TENTATIVE))
2643 ipv6_ifa_notify(0, ifp);
2644 } else
2645 spin_unlock_bh(&ifp->lock);
2646
2647 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2648 create, now);
2649
2650 in6_ifa_put(ifp);
2651 addrconf_verify();
2652 }
2653
2654 return 0;
2655 }
2656 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2657
2658 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2659 {
2660 struct prefix_info *pinfo;
2661 __u32 valid_lft;
2662 __u32 prefered_lft;
2663 int addr_type, err;
2664 u32 addr_flags = 0;
2665 struct inet6_dev *in6_dev;
2666 struct net *net = dev_net(dev);
2667
2668 pinfo = (struct prefix_info *) opt;
2669
2670 if (len < sizeof(struct prefix_info)) {
2671 netdev_dbg(dev, "addrconf: prefix option too short\n");
2672 return;
2673 }
2674
2675 /*
2676 * Validation checks ([ADDRCONF], page 19)
2677 */
2678
2679 addr_type = ipv6_addr_type(&pinfo->prefix);
2680
2681 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2682 return;
2683
2684 valid_lft = ntohl(pinfo->valid);
2685 prefered_lft = ntohl(pinfo->prefered);
2686
2687 if (prefered_lft > valid_lft) {
2688 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2689 return;
2690 }
2691
2692 in6_dev = in6_dev_get(dev);
2693
2694 if (!in6_dev) {
2695 net_dbg_ratelimited("addrconf: device %s not configured\n",
2696 dev->name);
2697 return;
2698 }
2699
2700 /*
2701 * Two things going on here:
2702 * 1) Add routes for on-link prefixes
2703 * 2) Configure prefixes with the auto flag set
2704 */
2705
2706 if (pinfo->onlink) {
2707 struct fib6_info *rt;
2708 unsigned long rt_expires;
2709
2710 /* Avoid arithmetic overflow. Really, we could
2711 * save rt_expires in seconds, likely valid_lft,
2712 * but it would require division in fib gc, that it
2713 * not good.
2714 */
2715 if (HZ > USER_HZ)
2716 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2717 else
2718 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2719
2720 if (addrconf_finite_timeout(rt_expires))
2721 rt_expires *= HZ;
2722
2723 rt = addrconf_get_prefix_route(&pinfo->prefix,
2724 pinfo->prefix_len,
2725 dev,
2726 RTF_ADDRCONF | RTF_PREFIX_RT,
2727 RTF_DEFAULT, true);
2728
2729 if (rt) {
2730 /* Autoconf prefix route */
2731 if (valid_lft == 0) {
2732 ip6_del_rt(net, rt);
2733 rt = NULL;
2734 } else if (addrconf_finite_timeout(rt_expires)) {
2735 /* not infinity */
2736 fib6_set_expires(rt, jiffies + rt_expires);
2737 } else {
2738 fib6_clean_expires(rt);
2739 }
2740 } else if (valid_lft) {
2741 clock_t expires = 0;
2742 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2743 if (addrconf_finite_timeout(rt_expires)) {
2744 /* not infinity */
2745 flags |= RTF_EXPIRES;
2746 expires = jiffies_to_clock_t(rt_expires);
2747 }
2748 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2749 0, dev, expires, flags,
2750 GFP_ATOMIC);
2751 }
2752 fib6_info_release(rt);
2753 }
2754
2755 /* Try to figure out our local address for this prefix */
2756
2757 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2758 struct in6_addr addr;
2759 bool tokenized = false, dev_addr_generated = false;
2760
2761 if (pinfo->prefix_len == 64) {
2762 memcpy(&addr, &pinfo->prefix, 8);
2763
2764 if (!ipv6_addr_any(&in6_dev->token)) {
2765 read_lock_bh(&in6_dev->lock);
2766 memcpy(addr.s6_addr + 8,
2767 in6_dev->token.s6_addr + 8, 8);
2768 read_unlock_bh(&in6_dev->lock);
2769 tokenized = true;
2770 } else if (is_addr_mode_generate_stable(in6_dev) &&
2771 !ipv6_generate_stable_address(&addr, 0,
2772 in6_dev)) {
2773 addr_flags |= IFA_F_STABLE_PRIVACY;
2774 goto ok;
2775 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2776 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2777 goto put;
2778 } else {
2779 dev_addr_generated = true;
2780 }
2781 goto ok;
2782 }
2783 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2784 pinfo->prefix_len);
2785 goto put;
2786
2787 ok:
2788 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2789 &addr, addr_type,
2790 addr_flags, sllao,
2791 tokenized, valid_lft,
2792 prefered_lft);
2793 if (err)
2794 goto put;
2795
2796 /* Ignore error case here because previous prefix add addr was
2797 * successful which will be notified.
2798 */
2799 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2800 addr_type, addr_flags, sllao,
2801 tokenized, valid_lft,
2802 prefered_lft,
2803 dev_addr_generated);
2804 }
2805 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2806 put:
2807 in6_dev_put(in6_dev);
2808 }
2809
2810 /*
2811 * Set destination address.
2812 * Special case for SIT interfaces where we create a new "virtual"
2813 * device.
2814 */
2815 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2816 {
2817 struct in6_ifreq ireq;
2818 struct net_device *dev;
2819 int err = -EINVAL;
2820
2821 rtnl_lock();
2822
2823 err = -EFAULT;
2824 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2825 goto err_exit;
2826
2827 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2828
2829 err = -ENODEV;
2830 if (!dev)
2831 goto err_exit;
2832
2833 #if IS_ENABLED(CONFIG_IPV6_SIT)
2834 if (dev->type == ARPHRD_SIT) {
2835 const struct net_device_ops *ops = dev->netdev_ops;
2836 struct ifreq ifr;
2837 struct ip_tunnel_parm p;
2838
2839 err = -EADDRNOTAVAIL;
2840 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2841 goto err_exit;
2842
2843 memset(&p, 0, sizeof(p));
2844 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2845 p.iph.saddr = 0;
2846 p.iph.version = 4;
2847 p.iph.ihl = 5;
2848 p.iph.protocol = IPPROTO_IPV6;
2849 p.iph.ttl = 64;
2850 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2851
2852 if (ops->ndo_do_ioctl) {
2853 mm_segment_t oldfs = get_fs();
2854
2855 set_fs(KERNEL_DS);
2856 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2857 set_fs(oldfs);
2858 } else
2859 err = -EOPNOTSUPP;
2860
2861 if (err == 0) {
2862 err = -ENOBUFS;
2863 dev = __dev_get_by_name(net, p.name);
2864 if (!dev)
2865 goto err_exit;
2866 err = dev_open(dev, NULL);
2867 }
2868 }
2869 #endif
2870
2871 err_exit:
2872 rtnl_unlock();
2873 return err;
2874 }
2875
2876 static int ipv6_mc_config(struct sock *sk, bool join,
2877 const struct in6_addr *addr, int ifindex)
2878 {
2879 int ret;
2880
2881 ASSERT_RTNL();
2882
2883 lock_sock(sk);
2884 if (join)
2885 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2886 else
2887 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2888 release_sock(sk);
2889
2890 return ret;
2891 }
2892
2893 /*
2894 * Manual configuration of address on an interface
2895 */
2896 static int inet6_addr_add(struct net *net, int ifindex,
2897 struct ifa6_config *cfg,
2898 struct netlink_ext_ack *extack)
2899 {
2900 struct inet6_ifaddr *ifp;
2901 struct inet6_dev *idev;
2902 struct net_device *dev;
2903 unsigned long timeout;
2904 clock_t expires;
2905 u32 flags;
2906
2907 ASSERT_RTNL();
2908
2909 if (cfg->plen > 128)
2910 return -EINVAL;
2911
2912 /* check the lifetime */
2913 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2914 return -EINVAL;
2915
2916 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2917 return -EINVAL;
2918
2919 dev = __dev_get_by_index(net, ifindex);
2920 if (!dev)
2921 return -ENODEV;
2922
2923 idev = addrconf_add_dev(dev);
2924 if (IS_ERR(idev))
2925 return PTR_ERR(idev);
2926
2927 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2928 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2929 true, cfg->pfx, ifindex);
2930
2931 if (ret < 0)
2932 return ret;
2933 }
2934
2935 cfg->scope = ipv6_addr_scope(cfg->pfx);
2936
2937 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2938 if (addrconf_finite_timeout(timeout)) {
2939 expires = jiffies_to_clock_t(timeout * HZ);
2940 cfg->valid_lft = timeout;
2941 flags = RTF_EXPIRES;
2942 } else {
2943 expires = 0;
2944 flags = 0;
2945 cfg->ifa_flags |= IFA_F_PERMANENT;
2946 }
2947
2948 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2949 if (addrconf_finite_timeout(timeout)) {
2950 if (timeout == 0)
2951 cfg->ifa_flags |= IFA_F_DEPRECATED;
2952 cfg->preferred_lft = timeout;
2953 }
2954
2955 ifp = ipv6_add_addr(idev, cfg, true, extack);
2956 if (!IS_ERR(ifp)) {
2957 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2958 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2959 ifp->rt_priority, dev, expires,
2960 flags, GFP_KERNEL);
2961 }
2962
2963 /* Send a netlink notification if DAD is enabled and
2964 * optimistic flag is not set
2965 */
2966 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2967 ipv6_ifa_notify(0, ifp);
2968 /*
2969 * Note that section 3.1 of RFC 4429 indicates
2970 * that the Optimistic flag should not be set for
2971 * manually configured addresses
2972 */
2973 addrconf_dad_start(ifp);
2974 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2975 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2976 cfg->preferred_lft, true, jiffies);
2977 in6_ifa_put(ifp);
2978 addrconf_verify_rtnl();
2979 return 0;
2980 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2981 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2982 cfg->pfx, ifindex);
2983 }
2984
2985 return PTR_ERR(ifp);
2986 }
2987
2988 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2989 const struct in6_addr *pfx, unsigned int plen)
2990 {
2991 struct inet6_ifaddr *ifp;
2992 struct inet6_dev *idev;
2993 struct net_device *dev;
2994
2995 if (plen > 128)
2996 return -EINVAL;
2997
2998 dev = __dev_get_by_index(net, ifindex);
2999 if (!dev)
3000 return -ENODEV;
3001
3002 idev = __in6_dev_get(dev);
3003 if (!idev)
3004 return -ENXIO;
3005
3006 read_lock_bh(&idev->lock);
3007 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3008 if (ifp->prefix_len == plen &&
3009 ipv6_addr_equal(pfx, &ifp->addr)) {
3010 in6_ifa_hold(ifp);
3011 read_unlock_bh(&idev->lock);
3012
3013 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3014 (ifa_flags & IFA_F_MANAGETEMPADDR))
3015 manage_tempaddrs(idev, ifp, 0, 0, false,
3016 jiffies);
3017 ipv6_del_addr(ifp);
3018 addrconf_verify_rtnl();
3019 if (ipv6_addr_is_multicast(pfx)) {
3020 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3021 false, pfx, dev->ifindex);
3022 }
3023 return 0;
3024 }
3025 }
3026 read_unlock_bh(&idev->lock);
3027 return -EADDRNOTAVAIL;
3028 }
3029
3030
3031 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3032 {
3033 struct ifa6_config cfg = {
3034 .ifa_flags = IFA_F_PERMANENT,
3035 .preferred_lft = INFINITY_LIFE_TIME,
3036 .valid_lft = INFINITY_LIFE_TIME,
3037 };
3038 struct in6_ifreq ireq;
3039 int err;
3040
3041 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3042 return -EPERM;
3043
3044 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3045 return -EFAULT;
3046
3047 cfg.pfx = &ireq.ifr6_addr;
3048 cfg.plen = ireq.ifr6_prefixlen;
3049
3050 rtnl_lock();
3051 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3052 rtnl_unlock();
3053 return err;
3054 }
3055
3056 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3057 {
3058 struct in6_ifreq ireq;
3059 int err;
3060
3061 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3062 return -EPERM;
3063
3064 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3065 return -EFAULT;
3066
3067 rtnl_lock();
3068 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3069 ireq.ifr6_prefixlen);
3070 rtnl_unlock();
3071 return err;
3072 }
3073
3074 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3075 int plen, int scope)
3076 {
3077 struct inet6_ifaddr *ifp;
3078 struct ifa6_config cfg = {
3079 .pfx = addr,
3080 .plen = plen,
3081 .ifa_flags = IFA_F_PERMANENT,
3082 .valid_lft = INFINITY_LIFE_TIME,
3083 .preferred_lft = INFINITY_LIFE_TIME,
3084 .scope = scope
3085 };
3086
3087 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3088 if (!IS_ERR(ifp)) {
3089 spin_lock_bh(&ifp->lock);
3090 ifp->flags &= ~IFA_F_TENTATIVE;
3091 spin_unlock_bh(&ifp->lock);
3092 rt_genid_bump_ipv6(dev_net(idev->dev));
3093 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3094 in6_ifa_put(ifp);
3095 }
3096 }
3097
3098 #if IS_ENABLED(CONFIG_IPV6_SIT)
3099 static void sit_add_v4_addrs(struct inet6_dev *idev)
3100 {
3101 struct in6_addr addr;
3102 struct net_device *dev;
3103 struct net *net = dev_net(idev->dev);
3104 int scope, plen;
3105 u32 pflags = 0;
3106
3107 ASSERT_RTNL();
3108
3109 memset(&addr, 0, sizeof(struct in6_addr));
3110 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3111
3112 if (idev->dev->flags&IFF_POINTOPOINT) {
3113 addr.s6_addr32[0] = htonl(0xfe800000);
3114 scope = IFA_LINK;
3115 plen = 64;
3116 } else {
3117 scope = IPV6_ADDR_COMPATv4;
3118 plen = 96;
3119 pflags |= RTF_NONEXTHOP;
3120 }
3121
3122 if (addr.s6_addr32[3]) {
3123 add_addr(idev, &addr, plen, scope);
3124 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3125 GFP_KERNEL);
3126 return;
3127 }
3128
3129 for_each_netdev(net, dev) {
3130 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3131 if (in_dev && (dev->flags & IFF_UP)) {
3132 struct in_ifaddr *ifa;
3133 int flag = scope;
3134
3135 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3136 addr.s6_addr32[3] = ifa->ifa_local;
3137
3138 if (ifa->ifa_scope == RT_SCOPE_LINK)
3139 continue;
3140 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3141 if (idev->dev->flags&IFF_POINTOPOINT)
3142 continue;
3143 flag |= IFA_HOST;
3144 }
3145
3146 add_addr(idev, &addr, plen, flag);
3147 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3148 0, pflags, GFP_KERNEL);
3149 }
3150 }
3151 }
3152 }
3153 #endif
3154
3155 static void init_loopback(struct net_device *dev)
3156 {
3157 struct inet6_dev *idev;
3158
3159 /* ::1 */
3160
3161 ASSERT_RTNL();
3162
3163 idev = ipv6_find_idev(dev);
3164 if (IS_ERR(idev)) {
3165 pr_debug("%s: add_dev failed\n", __func__);
3166 return;
3167 }
3168
3169 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3170 }
3171
3172 void addrconf_add_linklocal(struct inet6_dev *idev,
3173 const struct in6_addr *addr, u32 flags)
3174 {
3175 struct ifa6_config cfg = {
3176 .pfx = addr,
3177 .plen = 64,
3178 .ifa_flags = flags | IFA_F_PERMANENT,
3179 .valid_lft = INFINITY_LIFE_TIME,
3180 .preferred_lft = INFINITY_LIFE_TIME,
3181 .scope = IFA_LINK
3182 };
3183 struct inet6_ifaddr *ifp;
3184
3185 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3186 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3187 idev->cnf.optimistic_dad) &&
3188 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3189 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3190 #endif
3191
3192 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3193 if (!IS_ERR(ifp)) {
3194 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3195 0, 0, GFP_ATOMIC);
3196 addrconf_dad_start(ifp);
3197 in6_ifa_put(ifp);
3198 }
3199 }
3200 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3201
3202 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3203 {
3204 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3205 return true;
3206
3207 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3208 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3209 return true;
3210
3211 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3212 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3213 return true;
3214
3215 return false;
3216 }
3217
3218 static int ipv6_generate_stable_address(struct in6_addr *address,
3219 u8 dad_count,
3220 const struct inet6_dev *idev)
3221 {
3222 static DEFINE_SPINLOCK(lock);
3223 static __u32 digest[SHA_DIGEST_WORDS];
3224 static __u32 workspace[SHA_WORKSPACE_WORDS];
3225
3226 static union {
3227 char __data[SHA_MESSAGE_BYTES];
3228 struct {
3229 struct in6_addr secret;
3230 __be32 prefix[2];
3231 unsigned char hwaddr[MAX_ADDR_LEN];
3232 u8 dad_count;
3233 } __packed;
3234 } data;
3235
3236 struct in6_addr secret;
3237 struct in6_addr temp;
3238 struct net *net = dev_net(idev->dev);
3239
3240 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3241
3242 if (idev->cnf.stable_secret.initialized)
3243 secret = idev->cnf.stable_secret.secret;
3244 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3245 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3246 else
3247 return -1;
3248
3249 retry:
3250 spin_lock_bh(&lock);
3251
3252 sha_init(digest);
3253 memset(&data, 0, sizeof(data));
3254 memset(workspace, 0, sizeof(workspace));
3255 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3256 data.prefix[0] = address->s6_addr32[0];
3257 data.prefix[1] = address->s6_addr32[1];
3258 data.secret = secret;
3259 data.dad_count = dad_count;
3260
3261 sha_transform(digest, data.__data, workspace);
3262
3263 temp = *address;
3264 temp.s6_addr32[2] = (__force __be32)digest[0];
3265 temp.s6_addr32[3] = (__force __be32)digest[1];
3266
3267 spin_unlock_bh(&lock);
3268
3269 if (ipv6_reserved_interfaceid(temp)) {
3270 dad_count++;
3271 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3272 return -1;
3273 goto retry;
3274 }
3275
3276 *address = temp;
3277 return 0;
3278 }
3279
3280 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3281 {
3282 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3283
3284 if (s->initialized)
3285 return;
3286 s = &idev->cnf.stable_secret;
3287 get_random_bytes(&s->secret, sizeof(s->secret));
3288 s->initialized = true;
3289 }
3290
3291 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3292 {
3293 struct in6_addr addr;
3294
3295 /* no link local addresses on L3 master devices */
3296 if (netif_is_l3_master(idev->dev))
3297 return;
3298
3299 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3300
3301 switch (idev->cnf.addr_gen_mode) {
3302 case IN6_ADDR_GEN_MODE_RANDOM:
3303 ipv6_gen_mode_random_init(idev);
3304 /* fallthrough */
3305 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3306 if (!ipv6_generate_stable_address(&addr, 0, idev))
3307 addrconf_add_linklocal(idev, &addr,
3308 IFA_F_STABLE_PRIVACY);
3309 else if (prefix_route)
3310 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3311 0, 0, GFP_KERNEL);
3312 break;
3313 case IN6_ADDR_GEN_MODE_EUI64:
3314 /* addrconf_add_linklocal also adds a prefix_route and we
3315 * only need to care about prefix routes if ipv6_generate_eui64
3316 * couldn't generate one.
3317 */
3318 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3319 addrconf_add_linklocal(idev, &addr, 0);
3320 else if (prefix_route)
3321 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3322 0, 0, GFP_KERNEL);
3323 break;
3324 case IN6_ADDR_GEN_MODE_NONE:
3325 default:
3326 /* will not add any link local address */
3327 break;
3328 }
3329 }
3330
3331 static void addrconf_dev_config(struct net_device *dev)
3332 {
3333 struct inet6_dev *idev;
3334
3335 ASSERT_RTNL();
3336
3337 if ((dev->type != ARPHRD_ETHER) &&
3338 (dev->type != ARPHRD_FDDI) &&
3339 (dev->type != ARPHRD_ARCNET) &&
3340 (dev->type != ARPHRD_INFINIBAND) &&
3341 (dev->type != ARPHRD_IEEE1394) &&
3342 (dev->type != ARPHRD_TUNNEL6) &&
3343 (dev->type != ARPHRD_6LOWPAN) &&
3344 (dev->type != ARPHRD_IP6GRE) &&
3345 (dev->type != ARPHRD_IPGRE) &&
3346 (dev->type != ARPHRD_TUNNEL) &&
3347 (dev->type != ARPHRD_NONE) &&
3348 (dev->type != ARPHRD_RAWIP)) {
3349 /* Alas, we support only Ethernet autoconfiguration. */
3350 idev = __in6_dev_get(dev);
3351 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3352 dev->flags & IFF_MULTICAST)
3353 ipv6_mc_up(idev);
3354 return;
3355 }
3356
3357 idev = addrconf_add_dev(dev);
3358 if (IS_ERR(idev))
3359 return;
3360
3361 /* this device type has no EUI support */
3362 if (dev->type == ARPHRD_NONE &&
3363 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3364 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3365
3366 addrconf_addr_gen(idev, false);
3367 }
3368
3369 #if IS_ENABLED(CONFIG_IPV6_SIT)
3370 static void addrconf_sit_config(struct net_device *dev)
3371 {
3372 struct inet6_dev *idev;
3373
3374 ASSERT_RTNL();
3375
3376 /*
3377 * Configure the tunnel with one of our IPv4
3378 * addresses... we should configure all of
3379 * our v4 addrs in the tunnel
3380 */
3381
3382 idev = ipv6_find_idev(dev);
3383 if (IS_ERR(idev)) {
3384 pr_debug("%s: add_dev failed\n", __func__);
3385 return;
3386 }
3387
3388 if (dev->priv_flags & IFF_ISATAP) {
3389 addrconf_addr_gen(idev, false);
3390 return;
3391 }
3392
3393 sit_add_v4_addrs(idev);
3394
3395 if (dev->flags&IFF_POINTOPOINT)
3396 addrconf_add_mroute(dev);
3397 }
3398 #endif
3399
3400 #if IS_ENABLED(CONFIG_NET_IPGRE)
3401 static void addrconf_gre_config(struct net_device *dev)
3402 {
3403 struct inet6_dev *idev;
3404
3405 ASSERT_RTNL();
3406
3407 idev = ipv6_find_idev(dev);
3408 if (IS_ERR(idev)) {
3409 pr_debug("%s: add_dev failed\n", __func__);
3410 return;
3411 }
3412
3413 addrconf_addr_gen(idev, true);
3414 if (dev->flags & IFF_POINTOPOINT)
3415 addrconf_add_mroute(dev);
3416 }
3417 #endif
3418
3419 static int fixup_permanent_addr(struct net *net,
3420 struct inet6_dev *idev,
3421 struct inet6_ifaddr *ifp)
3422 {
3423 /* !fib6_node means the host route was removed from the
3424 * FIB, for example, if 'lo' device is taken down. In that
3425 * case regenerate the host route.
3426 */
3427 if (!ifp->rt || !ifp->rt->fib6_node) {
3428 struct fib6_info *f6i, *prev;
3429
3430 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3431 GFP_ATOMIC);
3432 if (IS_ERR(f6i))
3433 return PTR_ERR(f6i);
3434
3435 /* ifp->rt can be accessed outside of rtnl */
3436 spin_lock(&ifp->lock);
3437 prev = ifp->rt;
3438 ifp->rt = f6i;
3439 spin_unlock(&ifp->lock);
3440
3441 fib6_info_release(prev);
3442 }
3443
3444 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3445 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3446 ifp->rt_priority, idev->dev, 0, 0,
3447 GFP_ATOMIC);
3448 }
3449
3450 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3451 addrconf_dad_start(ifp);
3452
3453 return 0;
3454 }
3455
3456 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3457 {
3458 struct inet6_ifaddr *ifp, *tmp;
3459 struct inet6_dev *idev;
3460
3461 idev = __in6_dev_get(dev);
3462 if (!idev)
3463 return;
3464
3465 write_lock_bh(&idev->lock);
3466
3467 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3468 if ((ifp->flags & IFA_F_PERMANENT) &&
3469 fixup_permanent_addr(net, idev, ifp) < 0) {
3470 write_unlock_bh(&idev->lock);
3471 in6_ifa_hold(ifp);
3472 ipv6_del_addr(ifp);
3473 write_lock_bh(&idev->lock);
3474
3475 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3476 idev->dev->name, &ifp->addr);
3477 }
3478 }
3479
3480 write_unlock_bh(&idev->lock);
3481 }
3482
3483 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3484 void *ptr)
3485 {
3486 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3487 struct netdev_notifier_change_info *change_info;
3488 struct netdev_notifier_changeupper_info *info;
3489 struct inet6_dev *idev = __in6_dev_get(dev);
3490 struct net *net = dev_net(dev);
3491 int run_pending = 0;
3492 int err;
3493
3494 switch (event) {
3495 case NETDEV_REGISTER:
3496 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3497 idev = ipv6_add_dev(dev);
3498 if (IS_ERR(idev))
3499 return notifier_from_errno(PTR_ERR(idev));
3500 }
3501 break;
3502
3503 case NETDEV_CHANGEMTU:
3504 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3505 if (dev->mtu < IPV6_MIN_MTU) {
3506 addrconf_ifdown(dev, dev != net->loopback_dev);
3507 break;
3508 }
3509
3510 if (idev) {
3511 rt6_mtu_change(dev, dev->mtu);
3512 idev->cnf.mtu6 = dev->mtu;
3513 break;
3514 }
3515
3516 /* allocate new idev */
3517 idev = ipv6_add_dev(dev);
3518 if (IS_ERR(idev))
3519 break;
3520
3521 /* device is still not ready */
3522 if (!(idev->if_flags & IF_READY))
3523 break;
3524
3525 run_pending = 1;
3526
3527 /* fall through */
3528
3529 case NETDEV_UP:
3530 case NETDEV_CHANGE:
3531 if (dev->flags & IFF_SLAVE)
3532 break;
3533
3534 if (idev && idev->cnf.disable_ipv6)
3535 break;
3536
3537 if (event == NETDEV_UP) {
3538 /* restore routes for permanent addresses */
3539 addrconf_permanent_addr(net, dev);
3540
3541 if (!addrconf_link_ready(dev)) {
3542 /* device is not ready yet. */
3543 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3544 dev->name);
3545 break;
3546 }
3547
3548 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3549 idev = ipv6_add_dev(dev);
3550
3551 if (!IS_ERR_OR_NULL(idev)) {
3552 idev->if_flags |= IF_READY;
3553 run_pending = 1;
3554 }
3555 } else if (event == NETDEV_CHANGE) {
3556 if (!addrconf_link_ready(dev)) {
3557 /* device is still not ready. */
3558 rt6_sync_down_dev(dev, event);
3559 break;
3560 }
3561
3562 if (!IS_ERR_OR_NULL(idev)) {
3563 if (idev->if_flags & IF_READY) {
3564 /* device is already configured -
3565 * but resend MLD reports, we might
3566 * have roamed and need to update
3567 * multicast snooping switches
3568 */
3569 ipv6_mc_up(idev);
3570 change_info = ptr;
3571 if (change_info->flags_changed & IFF_NOARP)
3572 addrconf_dad_run(idev, true);
3573 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3574 break;
3575 }
3576 idev->if_flags |= IF_READY;
3577 }
3578
3579 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3580 dev->name);
3581
3582 run_pending = 1;
3583 }
3584
3585 switch (dev->type) {
3586 #if IS_ENABLED(CONFIG_IPV6_SIT)
3587 case ARPHRD_SIT:
3588 addrconf_sit_config(dev);
3589 break;
3590 #endif
3591 #if IS_ENABLED(CONFIG_NET_IPGRE)
3592 case ARPHRD_IPGRE:
3593 addrconf_gre_config(dev);
3594 break;
3595 #endif
3596 case ARPHRD_LOOPBACK:
3597 init_loopback(dev);
3598 break;
3599
3600 default:
3601 addrconf_dev_config(dev);
3602 break;
3603 }
3604
3605 if (!IS_ERR_OR_NULL(idev)) {
3606 if (run_pending)
3607 addrconf_dad_run(idev, false);
3608
3609 /* Device has an address by now */
3610 rt6_sync_up(dev, RTNH_F_DEAD);
3611
3612 /*
3613 * If the MTU changed during the interface down,
3614 * when the interface up, the changed MTU must be
3615 * reflected in the idev as well as routers.
3616 */
3617 if (idev->cnf.mtu6 != dev->mtu &&
3618 dev->mtu >= IPV6_MIN_MTU) {
3619 rt6_mtu_change(dev, dev->mtu);
3620 idev->cnf.mtu6 = dev->mtu;
3621 }
3622 idev->tstamp = jiffies;
3623 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3624
3625 /*
3626 * If the changed mtu during down is lower than
3627 * IPV6_MIN_MTU stop IPv6 on this interface.
3628 */
3629 if (dev->mtu < IPV6_MIN_MTU)
3630 addrconf_ifdown(dev, dev != net->loopback_dev);
3631 }
3632 break;
3633
3634 case NETDEV_DOWN:
3635 case NETDEV_UNREGISTER:
3636 /*
3637 * Remove all addresses from this interface.
3638 */
3639 addrconf_ifdown(dev, event != NETDEV_DOWN);
3640 break;
3641
3642 case NETDEV_CHANGENAME:
3643 if (idev) {
3644 snmp6_unregister_dev(idev);
3645 addrconf_sysctl_unregister(idev);
3646 err = addrconf_sysctl_register(idev);
3647 if (err)
3648 return notifier_from_errno(err);
3649 err = snmp6_register_dev(idev);
3650 if (err) {
3651 addrconf_sysctl_unregister(idev);
3652 return notifier_from_errno(err);
3653 }
3654 }
3655 break;
3656
3657 case NETDEV_PRE_TYPE_CHANGE:
3658 case NETDEV_POST_TYPE_CHANGE:
3659 if (idev)
3660 addrconf_type_change(dev, event);
3661 break;
3662
3663 case NETDEV_CHANGEUPPER:
3664 info = ptr;
3665
3666 /* flush all routes if dev is linked to or unlinked from
3667 * an L3 master device (e.g., VRF)
3668 */
3669 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3670 addrconf_ifdown(dev, 0);
3671 }
3672
3673 return NOTIFY_OK;
3674 }
3675
3676 /*
3677 * addrconf module should be notified of a device going up
3678 */
3679 static struct notifier_block ipv6_dev_notf = {
3680 .notifier_call = addrconf_notify,
3681 .priority = ADDRCONF_NOTIFY_PRIORITY,
3682 };
3683
3684 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3685 {
3686 struct inet6_dev *idev;
3687 ASSERT_RTNL();
3688
3689 idev = __in6_dev_get(dev);
3690
3691 if (event == NETDEV_POST_TYPE_CHANGE)
3692 ipv6_mc_remap(idev);
3693 else if (event == NETDEV_PRE_TYPE_CHANGE)
3694 ipv6_mc_unmap(idev);
3695 }
3696
3697 static bool addr_is_local(const struct in6_addr *addr)
3698 {
3699 return ipv6_addr_type(addr) &
3700 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3701 }
3702
3703 static int addrconf_ifdown(struct net_device *dev, int how)
3704 {
3705 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3706 struct net *net = dev_net(dev);
3707 struct inet6_dev *idev;
3708 struct inet6_ifaddr *ifa, *tmp;
3709 bool keep_addr = false;
3710 int state, i;
3711
3712 ASSERT_RTNL();
3713
3714 rt6_disable_ip(dev, event);
3715
3716 idev = __in6_dev_get(dev);
3717 if (!idev)
3718 return -ENODEV;
3719
3720 /*
3721 * Step 1: remove reference to ipv6 device from parent device.
3722 * Do not dev_put!
3723 */
3724 if (how) {
3725 idev->dead = 1;
3726
3727 /* protected by rtnl_lock */
3728 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3729
3730 /* Step 1.5: remove snmp6 entry */
3731 snmp6_unregister_dev(idev);
3732
3733 }
3734
3735 /* combine the user config with event to determine if permanent
3736 * addresses are to be removed from address hash table
3737 */
3738 if (!how && !idev->cnf.disable_ipv6) {
3739 /* aggregate the system setting and interface setting */
3740 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3741
3742 if (!_keep_addr)
3743 _keep_addr = idev->cnf.keep_addr_on_down;
3744
3745 keep_addr = (_keep_addr > 0);
3746 }
3747
3748 /* Step 2: clear hash table */
3749 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3750 struct hlist_head *h = &inet6_addr_lst[i];
3751
3752 spin_lock_bh(&addrconf_hash_lock);
3753 restart:
3754 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3755 if (ifa->idev == idev) {
3756 addrconf_del_dad_work(ifa);
3757 /* combined flag + permanent flag decide if
3758 * address is retained on a down event
3759 */
3760 if (!keep_addr ||
3761 !(ifa->flags & IFA_F_PERMANENT) ||
3762 addr_is_local(&ifa->addr)) {
3763 hlist_del_init_rcu(&ifa->addr_lst);
3764 goto restart;
3765 }
3766 }
3767 }
3768 spin_unlock_bh(&addrconf_hash_lock);
3769 }
3770
3771 write_lock_bh(&idev->lock);
3772
3773 addrconf_del_rs_timer(idev);
3774
3775 /* Step 2: clear flags for stateless addrconf */
3776 if (!how)
3777 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3778
3779 /* Step 3: clear tempaddr list */
3780 while (!list_empty(&idev->tempaddr_list)) {
3781 ifa = list_first_entry(&idev->tempaddr_list,
3782 struct inet6_ifaddr, tmp_list);
3783 list_del(&ifa->tmp_list);
3784 write_unlock_bh(&idev->lock);
3785 spin_lock_bh(&ifa->lock);
3786
3787 if (ifa->ifpub) {
3788 in6_ifa_put(ifa->ifpub);
3789 ifa->ifpub = NULL;
3790 }
3791 spin_unlock_bh(&ifa->lock);
3792 in6_ifa_put(ifa);
3793 write_lock_bh(&idev->lock);
3794 }
3795
3796 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3797 struct fib6_info *rt = NULL;
3798 bool keep;
3799
3800 addrconf_del_dad_work(ifa);
3801
3802 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3803 !addr_is_local(&ifa->addr);
3804
3805 write_unlock_bh(&idev->lock);
3806 spin_lock_bh(&ifa->lock);
3807
3808 if (keep) {
3809 /* set state to skip the notifier below */
3810 state = INET6_IFADDR_STATE_DEAD;
3811 ifa->state = INET6_IFADDR_STATE_PREDAD;
3812 if (!(ifa->flags & IFA_F_NODAD))
3813 ifa->flags |= IFA_F_TENTATIVE;
3814
3815 rt = ifa->rt;
3816 ifa->rt = NULL;
3817 } else {
3818 state = ifa->state;
3819 ifa->state = INET6_IFADDR_STATE_DEAD;
3820 }
3821
3822 spin_unlock_bh(&ifa->lock);
3823
3824 if (rt)
3825 ip6_del_rt(net, rt);
3826
3827 if (state != INET6_IFADDR_STATE_DEAD) {
3828 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3829 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3830 } else {
3831 if (idev->cnf.forwarding)
3832 addrconf_leave_anycast(ifa);
3833 addrconf_leave_solict(ifa->idev, &ifa->addr);
3834 }
3835
3836 write_lock_bh(&idev->lock);
3837 if (!keep) {
3838 list_del_rcu(&ifa->if_list);
3839 in6_ifa_put(ifa);
3840 }
3841 }
3842
3843 write_unlock_bh(&idev->lock);
3844
3845 /* Step 5: Discard anycast and multicast list */
3846 if (how) {
3847 ipv6_ac_destroy_dev(idev);
3848 ipv6_mc_destroy_dev(idev);
3849 } else {
3850 ipv6_mc_down(idev);
3851 }
3852
3853 idev->tstamp = jiffies;
3854
3855 /* Last: Shot the device (if unregistered) */
3856 if (how) {
3857 addrconf_sysctl_unregister(idev);
3858 neigh_parms_release(&nd_tbl, idev->nd_parms);
3859 neigh_ifdown(&nd_tbl, dev);
3860 in6_dev_put(idev);
3861 }
3862 return 0;
3863 }
3864
3865 static void addrconf_rs_timer(struct timer_list *t)
3866 {
3867 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3868 struct net_device *dev = idev->dev;
3869 struct in6_addr lladdr;
3870
3871 write_lock(&idev->lock);
3872 if (idev->dead || !(idev->if_flags & IF_READY))
3873 goto out;
3874
3875 if (!ipv6_accept_ra(idev))
3876 goto out;
3877
3878 /* Announcement received after solicitation was sent */
3879 if (idev->if_flags & IF_RA_RCVD)
3880 goto out;
3881
3882 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3883 write_unlock(&idev->lock);
3884 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3885 ndisc_send_rs(dev, &lladdr,
3886 &in6addr_linklocal_allrouters);
3887 else
3888 goto put;
3889
3890 write_lock(&idev->lock);
3891 idev->rs_interval = rfc3315_s14_backoff_update(
3892 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3893 /* The wait after the last probe can be shorter */
3894 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3895 idev->cnf.rtr_solicits) ?
3896 idev->cnf.rtr_solicit_delay :
3897 idev->rs_interval);
3898 } else {
3899 /*
3900 * Note: we do not support deprecated "all on-link"
3901 * assumption any longer.
3902 */
3903 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3904 }
3905
3906 out:
3907 write_unlock(&idev->lock);
3908 put:
3909 in6_dev_put(idev);
3910 }
3911
3912 /*
3913 * Duplicate Address Detection
3914 */
3915 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3916 {
3917 unsigned long rand_num;
3918 struct inet6_dev *idev = ifp->idev;
3919 u64 nonce;
3920
3921 if (ifp->flags & IFA_F_OPTIMISTIC)
3922 rand_num = 0;
3923 else
3924 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3925
3926 nonce = 0;
3927 if (idev->cnf.enhanced_dad ||
3928 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3929 do
3930 get_random_bytes(&nonce, 6);
3931 while (nonce == 0);
3932 }
3933 ifp->dad_nonce = nonce;
3934 ifp->dad_probes = idev->cnf.dad_transmits;
3935 addrconf_mod_dad_work(ifp, rand_num);
3936 }
3937
3938 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3939 {
3940 struct inet6_dev *idev = ifp->idev;
3941 struct net_device *dev = idev->dev;
3942 bool bump_id, notify = false;
3943 struct net *net;
3944
3945 addrconf_join_solict(dev, &ifp->addr);
3946
3947 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3948
3949 read_lock_bh(&idev->lock);
3950 spin_lock(&ifp->lock);
3951 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3952 goto out;
3953
3954 net = dev_net(dev);
3955 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3956 (net->ipv6.devconf_all->accept_dad < 1 &&
3957 idev->cnf.accept_dad < 1) ||
3958 !(ifp->flags&IFA_F_TENTATIVE) ||
3959 ifp->flags & IFA_F_NODAD) {
3960 bool send_na = false;
3961
3962 if (ifp->flags & IFA_F_TENTATIVE &&
3963 !(ifp->flags & IFA_F_OPTIMISTIC))
3964 send_na = true;
3965 bump_id = ifp->flags & IFA_F_TENTATIVE;
3966 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3967 spin_unlock(&ifp->lock);
3968 read_unlock_bh(&idev->lock);
3969
3970 addrconf_dad_completed(ifp, bump_id, send_na);
3971 return;
3972 }
3973
3974 if (!(idev->if_flags & IF_READY)) {
3975 spin_unlock(&ifp->lock);
3976 read_unlock_bh(&idev->lock);
3977 /*
3978 * If the device is not ready:
3979 * - keep it tentative if it is a permanent address.
3980 * - otherwise, kill it.
3981 */
3982 in6_ifa_hold(ifp);
3983 addrconf_dad_stop(ifp, 0);
3984 return;
3985 }
3986
3987 /*
3988 * Optimistic nodes can start receiving
3989 * Frames right away
3990 */
3991 if (ifp->flags & IFA_F_OPTIMISTIC) {
3992 ip6_ins_rt(net, ifp->rt);
3993 if (ipv6_use_optimistic_addr(net, idev)) {
3994 /* Because optimistic nodes can use this address,
3995 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3996 */
3997 notify = true;
3998 }
3999 }
4000
4001 addrconf_dad_kick(ifp);
4002 out:
4003 spin_unlock(&ifp->lock);
4004 read_unlock_bh(&idev->lock);
4005 if (notify)
4006 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4007 }
4008
4009 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4010 {
4011 bool begin_dad = false;
4012
4013 spin_lock_bh(&ifp->lock);
4014 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4015 ifp->state = INET6_IFADDR_STATE_PREDAD;
4016 begin_dad = true;
4017 }
4018 spin_unlock_bh(&ifp->lock);
4019
4020 if (begin_dad)
4021 addrconf_mod_dad_work(ifp, 0);
4022 }
4023
4024 static void addrconf_dad_work(struct work_struct *w)
4025 {
4026 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4027 struct inet6_ifaddr,
4028 dad_work);
4029 struct inet6_dev *idev = ifp->idev;
4030 bool bump_id, disable_ipv6 = false;
4031 struct in6_addr mcaddr;
4032
4033 enum {
4034 DAD_PROCESS,
4035 DAD_BEGIN,
4036 DAD_ABORT,
4037 } action = DAD_PROCESS;
4038
4039 rtnl_lock();
4040
4041 spin_lock_bh(&ifp->lock);
4042 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4043 action = DAD_BEGIN;
4044 ifp->state = INET6_IFADDR_STATE_DAD;
4045 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4046 action = DAD_ABORT;
4047 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4048
4049 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4050 idev->cnf.accept_dad > 1) &&
4051 !idev->cnf.disable_ipv6 &&
4052 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4053 struct in6_addr addr;
4054
4055 addr.s6_addr32[0] = htonl(0xfe800000);
4056 addr.s6_addr32[1] = 0;
4057
4058 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4059 ipv6_addr_equal(&ifp->addr, &addr)) {
4060 /* DAD failed for link-local based on MAC */
4061 idev->cnf.disable_ipv6 = 1;
4062
4063 pr_info("%s: IPv6 being disabled!\n",
4064 ifp->idev->dev->name);
4065 disable_ipv6 = true;
4066 }
4067 }
4068 }
4069 spin_unlock_bh(&ifp->lock);
4070
4071 if (action == DAD_BEGIN) {
4072 addrconf_dad_begin(ifp);
4073 goto out;
4074 } else if (action == DAD_ABORT) {
4075 in6_ifa_hold(ifp);
4076 addrconf_dad_stop(ifp, 1);
4077 if (disable_ipv6)
4078 addrconf_ifdown(idev->dev, 0);
4079 goto out;
4080 }
4081
4082 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4083 goto out;
4084
4085 write_lock_bh(&idev->lock);
4086 if (idev->dead || !(idev->if_flags & IF_READY)) {
4087 write_unlock_bh(&idev->lock);
4088 goto out;
4089 }
4090
4091 spin_lock(&ifp->lock);
4092 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4093 spin_unlock(&ifp->lock);
4094 write_unlock_bh(&idev->lock);
4095 goto out;
4096 }
4097
4098 if (ifp->dad_probes == 0) {
4099 bool send_na = false;
4100
4101 /*
4102 * DAD was successful
4103 */
4104
4105 if (ifp->flags & IFA_F_TENTATIVE &&
4106 !(ifp->flags & IFA_F_OPTIMISTIC))
4107 send_na = true;
4108 bump_id = ifp->flags & IFA_F_TENTATIVE;
4109 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4110 spin_unlock(&ifp->lock);
4111 write_unlock_bh(&idev->lock);
4112
4113 addrconf_dad_completed(ifp, bump_id, send_na);
4114
4115 goto out;
4116 }
4117
4118 ifp->dad_probes--;
4119 addrconf_mod_dad_work(ifp,
4120 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4121 spin_unlock(&ifp->lock);
4122 write_unlock_bh(&idev->lock);
4123
4124 /* send a neighbour solicitation for our addr */
4125 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4126 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4127 ifp->dad_nonce);
4128 out:
4129 in6_ifa_put(ifp);
4130 rtnl_unlock();
4131 }
4132
4133 /* ifp->idev must be at least read locked */
4134 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4135 {
4136 struct inet6_ifaddr *ifpiter;
4137 struct inet6_dev *idev = ifp->idev;
4138
4139 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4140 if (ifpiter->scope > IFA_LINK)
4141 break;
4142 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4143 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4144 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4145 IFA_F_PERMANENT)
4146 return false;
4147 }
4148 return true;
4149 }
4150
4151 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4152 bool send_na)
4153 {
4154 struct net_device *dev = ifp->idev->dev;
4155 struct in6_addr lladdr;
4156 bool send_rs, send_mld;
4157
4158 addrconf_del_dad_work(ifp);
4159
4160 /*
4161 * Configure the address for reception. Now it is valid.
4162 */
4163
4164 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4165
4166 /* If added prefix is link local and we are prepared to process
4167 router advertisements, start sending router solicitations.
4168 */
4169
4170 read_lock_bh(&ifp->idev->lock);
4171 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4172 send_rs = send_mld &&
4173 ipv6_accept_ra(ifp->idev) &&
4174 ifp->idev->cnf.rtr_solicits != 0 &&
4175 (dev->flags&IFF_LOOPBACK) == 0;
4176 read_unlock_bh(&ifp->idev->lock);
4177
4178 /* While dad is in progress mld report's source address is in6_addrany.
4179 * Resend with proper ll now.
4180 */
4181 if (send_mld)
4182 ipv6_mc_dad_complete(ifp->idev);
4183
4184 /* send unsolicited NA if enabled */
4185 if (send_na &&
4186 (ifp->idev->cnf.ndisc_notify ||
4187 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4188 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4189 /*router=*/ !!ifp->idev->cnf.forwarding,
4190 /*solicited=*/ false, /*override=*/ true,
4191 /*inc_opt=*/ true);
4192 }
4193
4194 if (send_rs) {
4195 /*
4196 * If a host as already performed a random delay
4197 * [...] as part of DAD [...] there is no need
4198 * to delay again before sending the first RS
4199 */
4200 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4201 return;
4202 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4203
4204 write_lock_bh(&ifp->idev->lock);
4205 spin_lock(&ifp->lock);
4206 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4207 ifp->idev->cnf.rtr_solicit_interval);
4208 ifp->idev->rs_probes = 1;
4209 ifp->idev->if_flags |= IF_RS_SENT;
4210 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4211 spin_unlock(&ifp->lock);
4212 write_unlock_bh(&ifp->idev->lock);
4213 }
4214
4215 if (bump_id)
4216 rt_genid_bump_ipv6(dev_net(dev));
4217
4218 /* Make sure that a new temporary address will be created
4219 * before this temporary address becomes deprecated.
4220 */
4221 if (ifp->flags & IFA_F_TEMPORARY)
4222 addrconf_verify_rtnl();
4223 }
4224
4225 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4226 {
4227 struct inet6_ifaddr *ifp;
4228
4229 read_lock_bh(&idev->lock);
4230 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4231 spin_lock(&ifp->lock);
4232 if ((ifp->flags & IFA_F_TENTATIVE &&
4233 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4234 if (restart)
4235 ifp->state = INET6_IFADDR_STATE_PREDAD;
4236 addrconf_dad_kick(ifp);
4237 }
4238 spin_unlock(&ifp->lock);
4239 }
4240 read_unlock_bh(&idev->lock);
4241 }
4242
4243 #ifdef CONFIG_PROC_FS
4244 struct if6_iter_state {
4245 struct seq_net_private p;
4246 int bucket;
4247 int offset;
4248 };
4249
4250 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4251 {
4252 struct if6_iter_state *state = seq->private;
4253 struct net *net = seq_file_net(seq);
4254 struct inet6_ifaddr *ifa = NULL;
4255 int p = 0;
4256
4257 /* initial bucket if pos is 0 */
4258 if (pos == 0) {
4259 state->bucket = 0;
4260 state->offset = 0;
4261 }
4262
4263 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4264 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4265 addr_lst) {
4266 if (!net_eq(dev_net(ifa->idev->dev), net))
4267 continue;
4268 /* sync with offset */
4269 if (p < state->offset) {
4270 p++;
4271 continue;
4272 }
4273 return ifa;
4274 }
4275
4276 /* prepare for next bucket */
4277 state->offset = 0;
4278 p = 0;
4279 }
4280 return NULL;
4281 }
4282
4283 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4284 struct inet6_ifaddr *ifa)
4285 {
4286 struct if6_iter_state *state = seq->private;
4287 struct net *net = seq_file_net(seq);
4288
4289 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4290 if (!net_eq(dev_net(ifa->idev->dev), net))
4291 continue;
4292 state->offset++;
4293 return ifa;
4294 }
4295
4296 state->offset = 0;
4297 while (++state->bucket < IN6_ADDR_HSIZE) {
4298 hlist_for_each_entry_rcu(ifa,
4299 &inet6_addr_lst[state->bucket], addr_lst) {
4300 if (!net_eq(dev_net(ifa->idev->dev), net))
4301 continue;
4302 return ifa;
4303 }
4304 }
4305
4306 return NULL;
4307 }
4308
4309 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4310 __acquires(rcu)
4311 {
4312 rcu_read_lock();
4313 return if6_get_first(seq, *pos);
4314 }
4315
4316 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4317 {
4318 struct inet6_ifaddr *ifa;
4319
4320 ifa = if6_get_next(seq, v);
4321 ++*pos;
4322 return ifa;
4323 }
4324
4325 static void if6_seq_stop(struct seq_file *seq, void *v)
4326 __releases(rcu)
4327 {
4328 rcu_read_unlock();
4329 }
4330
4331 static int if6_seq_show(struct seq_file *seq, void *v)
4332 {
4333 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4334 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4335 &ifp->addr,
4336 ifp->idev->dev->ifindex,
4337 ifp->prefix_len,
4338 ifp->scope,
4339 (u8) ifp->flags,
4340 ifp->idev->dev->name);
4341 return 0;
4342 }
4343
4344 static const struct seq_operations if6_seq_ops = {
4345 .start = if6_seq_start,
4346 .next = if6_seq_next,
4347 .show = if6_seq_show,
4348 .stop = if6_seq_stop,
4349 };
4350
4351 static int __net_init if6_proc_net_init(struct net *net)
4352 {
4353 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4354 sizeof(struct if6_iter_state)))
4355 return -ENOMEM;
4356 return 0;
4357 }
4358
4359 static void __net_exit if6_proc_net_exit(struct net *net)
4360 {
4361 remove_proc_entry("if_inet6", net->proc_net);
4362 }
4363
4364 static struct pernet_operations if6_proc_net_ops = {
4365 .init = if6_proc_net_init,
4366 .exit = if6_proc_net_exit,
4367 };
4368
4369 int __init if6_proc_init(void)
4370 {
4371 return register_pernet_subsys(&if6_proc_net_ops);
4372 }
4373
4374 void if6_proc_exit(void)
4375 {
4376 unregister_pernet_subsys(&if6_proc_net_ops);
4377 }
4378 #endif /* CONFIG_PROC_FS */
4379
4380 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4381 /* Check if address is a home address configured on any interface. */
4382 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4383 {
4384 unsigned int hash = inet6_addr_hash(net, addr);
4385 struct inet6_ifaddr *ifp = NULL;
4386 int ret = 0;
4387
4388 rcu_read_lock();
4389 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4390 if (!net_eq(dev_net(ifp->idev->dev), net))
4391 continue;
4392 if (ipv6_addr_equal(&ifp->addr, addr) &&
4393 (ifp->flags & IFA_F_HOMEADDRESS)) {
4394 ret = 1;
4395 break;
4396 }
4397 }
4398 rcu_read_unlock();
4399 return ret;
4400 }
4401 #endif
4402
4403 /*
4404 * Periodic address status verification
4405 */
4406
4407 static void addrconf_verify_rtnl(void)
4408 {
4409 unsigned long now, next, next_sec, next_sched;
4410 struct inet6_ifaddr *ifp;
4411 int i;
4412
4413 ASSERT_RTNL();
4414
4415 rcu_read_lock_bh();
4416 now = jiffies;
4417 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4418
4419 cancel_delayed_work(&addr_chk_work);
4420
4421 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4422 restart:
4423 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4424 unsigned long age;
4425
4426 /* When setting preferred_lft to a value not zero or
4427 * infinity, while valid_lft is infinity
4428 * IFA_F_PERMANENT has a non-infinity life time.
4429 */
4430 if ((ifp->flags & IFA_F_PERMANENT) &&
4431 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4432 continue;
4433
4434 spin_lock(&ifp->lock);
4435 /* We try to batch several events at once. */
4436 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4437
4438 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4439 age >= ifp->valid_lft) {
4440 spin_unlock(&ifp->lock);
4441 in6_ifa_hold(ifp);
4442 ipv6_del_addr(ifp);
4443 goto restart;
4444 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4445 spin_unlock(&ifp->lock);
4446 continue;
4447 } else if (age >= ifp->prefered_lft) {
4448 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4449 int deprecate = 0;
4450
4451 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4452 deprecate = 1;
4453 ifp->flags |= IFA_F_DEPRECATED;
4454 }
4455
4456 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4457 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4458 next = ifp->tstamp + ifp->valid_lft * HZ;
4459
4460 spin_unlock(&ifp->lock);
4461
4462 if (deprecate) {
4463 in6_ifa_hold(ifp);
4464
4465 ipv6_ifa_notify(0, ifp);
4466 in6_ifa_put(ifp);
4467 goto restart;
4468 }
4469 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4470 !(ifp->flags&IFA_F_TENTATIVE)) {
4471 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4472 ifp->idev->cnf.dad_transmits *
4473 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4474
4475 if (age >= ifp->prefered_lft - regen_advance) {
4476 struct inet6_ifaddr *ifpub = ifp->ifpub;
4477 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4478 next = ifp->tstamp + ifp->prefered_lft * HZ;
4479 if (!ifp->regen_count && ifpub) {
4480 ifp->regen_count++;
4481 in6_ifa_hold(ifp);
4482 in6_ifa_hold(ifpub);
4483 spin_unlock(&ifp->lock);
4484
4485 spin_lock(&ifpub->lock);
4486 ifpub->regen_count = 0;
4487 spin_unlock(&ifpub->lock);
4488 rcu_read_unlock_bh();
4489 ipv6_create_tempaddr(ifpub, ifp, true);
4490 in6_ifa_put(ifpub);
4491 in6_ifa_put(ifp);
4492 rcu_read_lock_bh();
4493 goto restart;
4494 }
4495 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4496 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4497 spin_unlock(&ifp->lock);
4498 } else {
4499 /* ifp->prefered_lft <= ifp->valid_lft */
4500 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4501 next = ifp->tstamp + ifp->prefered_lft * HZ;
4502 spin_unlock(&ifp->lock);
4503 }
4504 }
4505 }
4506
4507 next_sec = round_jiffies_up(next);
4508 next_sched = next;
4509
4510 /* If rounded timeout is accurate enough, accept it. */
4511 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4512 next_sched = next_sec;
4513
4514 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4515 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4516 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4517
4518 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4519 now, next, next_sec, next_sched);
4520 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4521 rcu_read_unlock_bh();
4522 }
4523
4524 static void addrconf_verify_work(struct work_struct *w)
4525 {
4526 rtnl_lock();
4527 addrconf_verify_rtnl();
4528 rtnl_unlock();
4529 }
4530
4531 static void addrconf_verify(void)
4532 {
4533 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4534 }
4535
4536 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4537 struct in6_addr **peer_pfx)
4538 {
4539 struct in6_addr *pfx = NULL;
4540
4541 *peer_pfx = NULL;
4542
4543 if (addr)
4544 pfx = nla_data(addr);
4545
4546 if (local) {
4547 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4548 *peer_pfx = pfx;
4549 pfx = nla_data(local);
4550 }
4551
4552 return pfx;
4553 }
4554
4555 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4556 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4557 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4558 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4559 [IFA_FLAGS] = { .len = sizeof(u32) },
4560 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4561 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4562 };
4563
4564 static int
4565 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4566 struct netlink_ext_ack *extack)
4567 {
4568 struct net *net = sock_net(skb->sk);
4569 struct ifaddrmsg *ifm;
4570 struct nlattr *tb[IFA_MAX+1];
4571 struct in6_addr *pfx, *peer_pfx;
4572 u32 ifa_flags;
4573 int err;
4574
4575 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4576 ifa_ipv6_policy, extack);
4577 if (err < 0)
4578 return err;
4579
4580 ifm = nlmsg_data(nlh);
4581 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4582 if (!pfx)
4583 return -EINVAL;
4584
4585 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4586
4587 /* We ignore other flags so far. */
4588 ifa_flags &= IFA_F_MANAGETEMPADDR;
4589
4590 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4591 ifm->ifa_prefixlen);
4592 }
4593
4594 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4595 unsigned long expires, u32 flags,
4596 bool modify_peer)
4597 {
4598 struct fib6_info *f6i;
4599 u32 prio;
4600
4601 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4602 ifp->prefix_len,
4603 ifp->idev->dev, 0, RTF_DEFAULT, true);
4604 if (!f6i)
4605 return -ENOENT;
4606
4607 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4608 if (f6i->fib6_metric != prio) {
4609 /* delete old one */
4610 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4611
4612 /* add new one */
4613 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4614 ifp->prefix_len,
4615 ifp->rt_priority, ifp->idev->dev,
4616 expires, flags, GFP_KERNEL);
4617 } else {
4618 if (!expires)
4619 fib6_clean_expires(f6i);
4620 else
4621 fib6_set_expires(f6i, expires);
4622
4623 fib6_info_release(f6i);
4624 }
4625
4626 return 0;
4627 }
4628
4629 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4630 {
4631 u32 flags;
4632 clock_t expires;
4633 unsigned long timeout;
4634 bool was_managetempaddr;
4635 bool had_prefixroute;
4636 bool new_peer = false;
4637
4638 ASSERT_RTNL();
4639
4640 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4641 return -EINVAL;
4642
4643 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4644 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4645 return -EINVAL;
4646
4647 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4648 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4649
4650 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4651 if (addrconf_finite_timeout(timeout)) {
4652 expires = jiffies_to_clock_t(timeout * HZ);
4653 cfg->valid_lft = timeout;
4654 flags = RTF_EXPIRES;
4655 } else {
4656 expires = 0;
4657 flags = 0;
4658 cfg->ifa_flags |= IFA_F_PERMANENT;
4659 }
4660
4661 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4662 if (addrconf_finite_timeout(timeout)) {
4663 if (timeout == 0)
4664 cfg->ifa_flags |= IFA_F_DEPRECATED;
4665 cfg->preferred_lft = timeout;
4666 }
4667
4668 if (cfg->peer_pfx &&
4669 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4670 if (!ipv6_addr_any(&ifp->peer_addr))
4671 cleanup_prefix_route(ifp, expires, true, true);
4672 new_peer = true;
4673 }
4674
4675 spin_lock_bh(&ifp->lock);
4676 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4677 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4678 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4679 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4680 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4681 IFA_F_NOPREFIXROUTE);
4682 ifp->flags |= cfg->ifa_flags;
4683 ifp->tstamp = jiffies;
4684 ifp->valid_lft = cfg->valid_lft;
4685 ifp->prefered_lft = cfg->preferred_lft;
4686
4687 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4688 ifp->rt_priority = cfg->rt_priority;
4689
4690 if (new_peer)
4691 ifp->peer_addr = *cfg->peer_pfx;
4692
4693 spin_unlock_bh(&ifp->lock);
4694 if (!(ifp->flags&IFA_F_TENTATIVE))
4695 ipv6_ifa_notify(0, ifp);
4696
4697 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4698 int rc = -ENOENT;
4699
4700 if (had_prefixroute)
4701 rc = modify_prefix_route(ifp, expires, flags, false);
4702
4703 /* prefix route could have been deleted; if so restore it */
4704 if (rc == -ENOENT) {
4705 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4706 ifp->rt_priority, ifp->idev->dev,
4707 expires, flags, GFP_KERNEL);
4708 }
4709
4710 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4711 rc = modify_prefix_route(ifp, expires, flags, true);
4712
4713 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4714 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4715 ifp->rt_priority, ifp->idev->dev,
4716 expires, flags, GFP_KERNEL);
4717 }
4718 } else if (had_prefixroute) {
4719 enum cleanup_prefix_rt_t action;
4720 unsigned long rt_expires;
4721
4722 write_lock_bh(&ifp->idev->lock);
4723 action = check_cleanup_prefix_route(ifp, &rt_expires);
4724 write_unlock_bh(&ifp->idev->lock);
4725
4726 if (action != CLEANUP_PREFIX_RT_NOP) {
4727 cleanup_prefix_route(ifp, rt_expires,
4728 action == CLEANUP_PREFIX_RT_DEL, false);
4729 }
4730 }
4731
4732 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4733 if (was_managetempaddr &&
4734 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4735 cfg->valid_lft = 0;
4736 cfg->preferred_lft = 0;
4737 }
4738 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4739 cfg->preferred_lft, !was_managetempaddr,
4740 jiffies);
4741 }
4742
4743 addrconf_verify_rtnl();
4744
4745 return 0;
4746 }
4747
4748 static int
4749 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4750 struct netlink_ext_ack *extack)
4751 {
4752 struct net *net = sock_net(skb->sk);
4753 struct ifaddrmsg *ifm;
4754 struct nlattr *tb[IFA_MAX+1];
4755 struct in6_addr *peer_pfx;
4756 struct inet6_ifaddr *ifa;
4757 struct net_device *dev;
4758 struct inet6_dev *idev;
4759 struct ifa6_config cfg;
4760 int err;
4761
4762 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4763 ifa_ipv6_policy, extack);
4764 if (err < 0)
4765 return err;
4766
4767 memset(&cfg, 0, sizeof(cfg));
4768
4769 ifm = nlmsg_data(nlh);
4770 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4771 if (!cfg.pfx)
4772 return -EINVAL;
4773
4774 cfg.peer_pfx = peer_pfx;
4775 cfg.plen = ifm->ifa_prefixlen;
4776 if (tb[IFA_RT_PRIORITY])
4777 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4778
4779 cfg.valid_lft = INFINITY_LIFE_TIME;
4780 cfg.preferred_lft = INFINITY_LIFE_TIME;
4781
4782 if (tb[IFA_CACHEINFO]) {
4783 struct ifa_cacheinfo *ci;
4784
4785 ci = nla_data(tb[IFA_CACHEINFO]);
4786 cfg.valid_lft = ci->ifa_valid;
4787 cfg.preferred_lft = ci->ifa_prefered;
4788 }
4789
4790 dev = __dev_get_by_index(net, ifm->ifa_index);
4791 if (!dev)
4792 return -ENODEV;
4793
4794 if (tb[IFA_FLAGS])
4795 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4796 else
4797 cfg.ifa_flags = ifm->ifa_flags;
4798
4799 /* We ignore other flags so far. */
4800 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4801 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4802 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4803
4804 idev = ipv6_find_idev(dev);
4805 if (IS_ERR(idev))
4806 return PTR_ERR(idev);
4807
4808 if (!ipv6_allow_optimistic_dad(net, idev))
4809 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4810
4811 if (cfg.ifa_flags & IFA_F_NODAD &&
4812 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4813 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4814 return -EINVAL;
4815 }
4816
4817 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4818 if (!ifa) {
4819 /*
4820 * It would be best to check for !NLM_F_CREATE here but
4821 * userspace already relies on not having to provide this.
4822 */
4823 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4824 }
4825
4826 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4827 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4828 err = -EEXIST;
4829 else
4830 err = inet6_addr_modify(ifa, &cfg);
4831
4832 in6_ifa_put(ifa);
4833
4834 return err;
4835 }
4836
4837 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4838 u8 scope, int ifindex)
4839 {
4840 struct ifaddrmsg *ifm;
4841
4842 ifm = nlmsg_data(nlh);
4843 ifm->ifa_family = AF_INET6;
4844 ifm->ifa_prefixlen = prefixlen;
4845 ifm->ifa_flags = flags;
4846 ifm->ifa_scope = scope;
4847 ifm->ifa_index = ifindex;
4848 }
4849
4850 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4851 unsigned long tstamp, u32 preferred, u32 valid)
4852 {
4853 struct ifa_cacheinfo ci;
4854
4855 ci.cstamp = cstamp_delta(cstamp);
4856 ci.tstamp = cstamp_delta(tstamp);
4857 ci.ifa_prefered = preferred;
4858 ci.ifa_valid = valid;
4859
4860 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4861 }
4862
4863 static inline int rt_scope(int ifa_scope)
4864 {
4865 if (ifa_scope & IFA_HOST)
4866 return RT_SCOPE_HOST;
4867 else if (ifa_scope & IFA_LINK)
4868 return RT_SCOPE_LINK;
4869 else if (ifa_scope & IFA_SITE)
4870 return RT_SCOPE_SITE;
4871 else
4872 return RT_SCOPE_UNIVERSE;
4873 }
4874
4875 static inline int inet6_ifaddr_msgsize(void)
4876 {
4877 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4878 + nla_total_size(16) /* IFA_LOCAL */
4879 + nla_total_size(16) /* IFA_ADDRESS */
4880 + nla_total_size(sizeof(struct ifa_cacheinfo))
4881 + nla_total_size(4) /* IFA_FLAGS */
4882 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4883 }
4884
4885 enum addr_type_t {
4886 UNICAST_ADDR,
4887 MULTICAST_ADDR,
4888 ANYCAST_ADDR,
4889 };
4890
4891 struct inet6_fill_args {
4892 u32 portid;
4893 u32 seq;
4894 int event;
4895 unsigned int flags;
4896 int netnsid;
4897 int ifindex;
4898 enum addr_type_t type;
4899 };
4900
4901 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4902 struct inet6_fill_args *args)
4903 {
4904 struct nlmsghdr *nlh;
4905 u32 preferred, valid;
4906
4907 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4908 sizeof(struct ifaddrmsg), args->flags);
4909 if (!nlh)
4910 return -EMSGSIZE;
4911
4912 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4913 ifa->idev->dev->ifindex);
4914
4915 if (args->netnsid >= 0 &&
4916 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4917 goto error;
4918
4919 if (!((ifa->flags&IFA_F_PERMANENT) &&
4920 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4921 preferred = ifa->prefered_lft;
4922 valid = ifa->valid_lft;
4923 if (preferred != INFINITY_LIFE_TIME) {
4924 long tval = (jiffies - ifa->tstamp)/HZ;
4925 if (preferred > tval)
4926 preferred -= tval;
4927 else
4928 preferred = 0;
4929 if (valid != INFINITY_LIFE_TIME) {
4930 if (valid > tval)
4931 valid -= tval;
4932 else
4933 valid = 0;
4934 }
4935 }
4936 } else {
4937 preferred = INFINITY_LIFE_TIME;
4938 valid = INFINITY_LIFE_TIME;
4939 }
4940
4941 if (!ipv6_addr_any(&ifa->peer_addr)) {
4942 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4943 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4944 goto error;
4945 } else
4946 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4947 goto error;
4948
4949 if (ifa->rt_priority &&
4950 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4951 goto error;
4952
4953 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4954 goto error;
4955
4956 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4957 goto error;
4958
4959 nlmsg_end(skb, nlh);
4960 return 0;
4961
4962 error:
4963 nlmsg_cancel(skb, nlh);
4964 return -EMSGSIZE;
4965 }
4966
4967 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4968 struct inet6_fill_args *args)
4969 {
4970 struct nlmsghdr *nlh;
4971 u8 scope = RT_SCOPE_UNIVERSE;
4972 int ifindex = ifmca->idev->dev->ifindex;
4973
4974 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4975 scope = RT_SCOPE_SITE;
4976
4977 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4978 sizeof(struct ifaddrmsg), args->flags);
4979 if (!nlh)
4980 return -EMSGSIZE;
4981
4982 if (args->netnsid >= 0 &&
4983 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4984 return -EMSGSIZE;
4985
4986 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4987 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4988 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4989 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4990 nlmsg_cancel(skb, nlh);
4991 return -EMSGSIZE;
4992 }
4993
4994 nlmsg_end(skb, nlh);
4995 return 0;
4996 }
4997
4998 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4999 struct inet6_fill_args *args)
5000 {
5001 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5002 int ifindex = dev ? dev->ifindex : 1;
5003 struct nlmsghdr *nlh;
5004 u8 scope = RT_SCOPE_UNIVERSE;
5005
5006 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5007 scope = RT_SCOPE_SITE;
5008
5009 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5010 sizeof(struct ifaddrmsg), args->flags);
5011 if (!nlh)
5012 return -EMSGSIZE;
5013
5014 if (args->netnsid >= 0 &&
5015 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5016 return -EMSGSIZE;
5017
5018 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5019 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5020 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5021 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5022 nlmsg_cancel(skb, nlh);
5023 return -EMSGSIZE;
5024 }
5025
5026 nlmsg_end(skb, nlh);
5027 return 0;
5028 }
5029
5030 /* called with rcu_read_lock() */
5031 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5032 struct netlink_callback *cb, int s_ip_idx,
5033 struct inet6_fill_args *fillargs)
5034 {
5035 struct ifmcaddr6 *ifmca;
5036 struct ifacaddr6 *ifaca;
5037 int ip_idx = 0;
5038 int err = 1;
5039
5040 read_lock_bh(&idev->lock);
5041 switch (fillargs->type) {
5042 case UNICAST_ADDR: {
5043 struct inet6_ifaddr *ifa;
5044 fillargs->event = RTM_NEWADDR;
5045
5046 /* unicast address incl. temp addr */
5047 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5048 if (ip_idx < s_ip_idx)
5049 goto next;
5050 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5051 if (err < 0)
5052 break;
5053 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5054 next:
5055 ip_idx++;
5056 }
5057 break;
5058 }
5059 case MULTICAST_ADDR:
5060 fillargs->event = RTM_GETMULTICAST;
5061
5062 /* multicast address */
5063 for (ifmca = idev->mc_list; ifmca;
5064 ifmca = ifmca->next, ip_idx++) {
5065 if (ip_idx < s_ip_idx)
5066 continue;
5067 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5068 if (err < 0)
5069 break;
5070 }
5071 break;
5072 case ANYCAST_ADDR:
5073 fillargs->event = RTM_GETANYCAST;
5074 /* anycast address */
5075 for (ifaca = idev->ac_list; ifaca;
5076 ifaca = ifaca->aca_next, ip_idx++) {
5077 if (ip_idx < s_ip_idx)
5078 continue;
5079 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5080 if (err < 0)
5081 break;
5082 }
5083 break;
5084 default:
5085 break;
5086 }
5087 read_unlock_bh(&idev->lock);
5088 cb->args[2] = ip_idx;
5089 return err;
5090 }
5091
5092 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5093 struct inet6_fill_args *fillargs,
5094 struct net **tgt_net, struct sock *sk,
5095 struct netlink_callback *cb)
5096 {
5097 struct netlink_ext_ack *extack = cb->extack;
5098 struct nlattr *tb[IFA_MAX+1];
5099 struct ifaddrmsg *ifm;
5100 int err, i;
5101
5102 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5103 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5104 return -EINVAL;
5105 }
5106
5107 ifm = nlmsg_data(nlh);
5108 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5109 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5110 return -EINVAL;
5111 }
5112
5113 fillargs->ifindex = ifm->ifa_index;
5114 if (fillargs->ifindex) {
5115 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5116 fillargs->flags |= NLM_F_DUMP_FILTERED;
5117 }
5118
5119 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5120 ifa_ipv6_policy, extack);
5121 if (err < 0)
5122 return err;
5123
5124 for (i = 0; i <= IFA_MAX; ++i) {
5125 if (!tb[i])
5126 continue;
5127
5128 if (i == IFA_TARGET_NETNSID) {
5129 struct net *net;
5130
5131 fillargs->netnsid = nla_get_s32(tb[i]);
5132 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5133 if (IS_ERR(net)) {
5134 fillargs->netnsid = -1;
5135 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5136 return PTR_ERR(net);
5137 }
5138 *tgt_net = net;
5139 } else {
5140 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5141 return -EINVAL;
5142 }
5143 }
5144
5145 return 0;
5146 }
5147
5148 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5149 enum addr_type_t type)
5150 {
5151 const struct nlmsghdr *nlh = cb->nlh;
5152 struct inet6_fill_args fillargs = {
5153 .portid = NETLINK_CB(cb->skb).portid,
5154 .seq = cb->nlh->nlmsg_seq,
5155 .flags = NLM_F_MULTI,
5156 .netnsid = -1,
5157 .type = type,
5158 };
5159 struct net *net = sock_net(skb->sk);
5160 struct net *tgt_net = net;
5161 int idx, s_idx, s_ip_idx;
5162 int h, s_h;
5163 struct net_device *dev;
5164 struct inet6_dev *idev;
5165 struct hlist_head *head;
5166 int err = 0;
5167
5168 s_h = cb->args[0];
5169 s_idx = idx = cb->args[1];
5170 s_ip_idx = cb->args[2];
5171
5172 if (cb->strict_check) {
5173 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5174 skb->sk, cb);
5175 if (err < 0)
5176 goto put_tgt_net;
5177
5178 err = 0;
5179 if (fillargs.ifindex) {
5180 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5181 if (!dev) {
5182 err = -ENODEV;
5183 goto put_tgt_net;
5184 }
5185 idev = __in6_dev_get(dev);
5186 if (idev) {
5187 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5188 &fillargs);
5189 if (err > 0)
5190 err = 0;
5191 }
5192 goto put_tgt_net;
5193 }
5194 }
5195
5196 rcu_read_lock();
5197 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5198 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5199 idx = 0;
5200 head = &tgt_net->dev_index_head[h];
5201 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5202 if (idx < s_idx)
5203 goto cont;
5204 if (h > s_h || idx > s_idx)
5205 s_ip_idx = 0;
5206 idev = __in6_dev_get(dev);
5207 if (!idev)
5208 goto cont;
5209
5210 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5211 &fillargs) < 0)
5212 goto done;
5213 cont:
5214 idx++;
5215 }
5216 }
5217 done:
5218 rcu_read_unlock();
5219 cb->args[0] = h;
5220 cb->args[1] = idx;
5221 put_tgt_net:
5222 if (fillargs.netnsid >= 0)
5223 put_net(tgt_net);
5224
5225 return skb->len ? : err;
5226 }
5227
5228 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5229 {
5230 enum addr_type_t type = UNICAST_ADDR;
5231
5232 return inet6_dump_addr(skb, cb, type);
5233 }
5234
5235 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5236 {
5237 enum addr_type_t type = MULTICAST_ADDR;
5238
5239 return inet6_dump_addr(skb, cb, type);
5240 }
5241
5242
5243 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5244 {
5245 enum addr_type_t type = ANYCAST_ADDR;
5246
5247 return inet6_dump_addr(skb, cb, type);
5248 }
5249
5250 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5251 const struct nlmsghdr *nlh,
5252 struct nlattr **tb,
5253 struct netlink_ext_ack *extack)
5254 {
5255 struct ifaddrmsg *ifm;
5256 int i, err;
5257
5258 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5259 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5260 return -EINVAL;
5261 }
5262
5263 if (!netlink_strict_get_check(skb))
5264 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5265 ifa_ipv6_policy, extack);
5266
5267 ifm = nlmsg_data(nlh);
5268 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5269 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5270 return -EINVAL;
5271 }
5272
5273 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5274 ifa_ipv6_policy, extack);
5275 if (err)
5276 return err;
5277
5278 for (i = 0; i <= IFA_MAX; i++) {
5279 if (!tb[i])
5280 continue;
5281
5282 switch (i) {
5283 case IFA_TARGET_NETNSID:
5284 case IFA_ADDRESS:
5285 case IFA_LOCAL:
5286 break;
5287 default:
5288 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5289 return -EINVAL;
5290 }
5291 }
5292
5293 return 0;
5294 }
5295
5296 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5297 struct netlink_ext_ack *extack)
5298 {
5299 struct net *net = sock_net(in_skb->sk);
5300 struct inet6_fill_args fillargs = {
5301 .portid = NETLINK_CB(in_skb).portid,
5302 .seq = nlh->nlmsg_seq,
5303 .event = RTM_NEWADDR,
5304 .flags = 0,
5305 .netnsid = -1,
5306 };
5307 struct net *tgt_net = net;
5308 struct ifaddrmsg *ifm;
5309 struct nlattr *tb[IFA_MAX+1];
5310 struct in6_addr *addr = NULL, *peer;
5311 struct net_device *dev = NULL;
5312 struct inet6_ifaddr *ifa;
5313 struct sk_buff *skb;
5314 int err;
5315
5316 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5317 if (err < 0)
5318 return err;
5319
5320 if (tb[IFA_TARGET_NETNSID]) {
5321 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5322
5323 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5324 fillargs.netnsid);
5325 if (IS_ERR(tgt_net))
5326 return PTR_ERR(tgt_net);
5327 }
5328
5329 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5330 if (!addr)
5331 return -EINVAL;
5332
5333 ifm = nlmsg_data(nlh);
5334 if (ifm->ifa_index)
5335 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5336
5337 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5338 if (!ifa) {
5339 err = -EADDRNOTAVAIL;
5340 goto errout;
5341 }
5342
5343 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5344 if (!skb) {
5345 err = -ENOBUFS;
5346 goto errout_ifa;
5347 }
5348
5349 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5350 if (err < 0) {
5351 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5352 WARN_ON(err == -EMSGSIZE);
5353 kfree_skb(skb);
5354 goto errout_ifa;
5355 }
5356 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5357 errout_ifa:
5358 in6_ifa_put(ifa);
5359 errout:
5360 if (dev)
5361 dev_put(dev);
5362 if (fillargs.netnsid >= 0)
5363 put_net(tgt_net);
5364
5365 return err;
5366 }
5367
5368 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5369 {
5370 struct sk_buff *skb;
5371 struct net *net = dev_net(ifa->idev->dev);
5372 struct inet6_fill_args fillargs = {
5373 .portid = 0,
5374 .seq = 0,
5375 .event = event,
5376 .flags = 0,
5377 .netnsid = -1,
5378 };
5379 int err = -ENOBUFS;
5380
5381 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5382 if (!skb)
5383 goto errout;
5384
5385 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5386 if (err < 0) {
5387 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5388 WARN_ON(err == -EMSGSIZE);
5389 kfree_skb(skb);
5390 goto errout;
5391 }
5392 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5393 return;
5394 errout:
5395 if (err < 0)
5396 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5397 }
5398
5399 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5400 __s32 *array, int bytes)
5401 {
5402 BUG_ON(bytes < (DEVCONF_MAX * 4));
5403
5404 memset(array, 0, bytes);
5405 array[DEVCONF_FORWARDING] = cnf->forwarding;
5406 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5407 array[DEVCONF_MTU6] = cnf->mtu6;
5408 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5409 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5410 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5411 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5412 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5413 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5414 jiffies_to_msecs(cnf->rtr_solicit_interval);
5415 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5416 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5417 array[DEVCONF_RTR_SOLICIT_DELAY] =
5418 jiffies_to_msecs(cnf->rtr_solicit_delay);
5419 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5420 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5421 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5422 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5423 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5424 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5425 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5426 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5427 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5428 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5429 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5430 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5431 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5432 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5433 #ifdef CONFIG_IPV6_ROUTER_PREF
5434 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5435 array[DEVCONF_RTR_PROBE_INTERVAL] =
5436 jiffies_to_msecs(cnf->rtr_probe_interval);
5437 #ifdef CONFIG_IPV6_ROUTE_INFO
5438 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5439 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5440 #endif
5441 #endif
5442 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5443 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5444 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5445 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5446 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5447 #endif
5448 #ifdef CONFIG_IPV6_MROUTE
5449 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5450 #endif
5451 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5452 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5453 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5454 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5455 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5456 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5457 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5458 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5459 /* we omit DEVCONF_STABLE_SECRET for now */
5460 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5461 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5462 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5463 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5464 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5465 #ifdef CONFIG_IPV6_SEG6_HMAC
5466 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5467 #endif
5468 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5469 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5470 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5471 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5472 }
5473
5474 static inline size_t inet6_ifla6_size(void)
5475 {
5476 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5477 + nla_total_size(sizeof(struct ifla_cacheinfo))
5478 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5479 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5480 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5481 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5482 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5483 + 0;
5484 }
5485
5486 static inline size_t inet6_if_nlmsg_size(void)
5487 {
5488 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5489 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5490 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5491 + nla_total_size(4) /* IFLA_MTU */
5492 + nla_total_size(4) /* IFLA_LINK */
5493 + nla_total_size(1) /* IFLA_OPERSTATE */
5494 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5495 }
5496
5497 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5498 int bytes)
5499 {
5500 int i;
5501 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5502 BUG_ON(pad < 0);
5503
5504 /* Use put_unaligned() because stats may not be aligned for u64. */
5505 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5506 for (i = 1; i < ICMP6_MIB_MAX; i++)
5507 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5508
5509 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5510 }
5511
5512 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5513 int bytes, size_t syncpoff)
5514 {
5515 int i, c;
5516 u64 buff[IPSTATS_MIB_MAX];
5517 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5518
5519 BUG_ON(pad < 0);
5520
5521 memset(buff, 0, sizeof(buff));
5522 buff[0] = IPSTATS_MIB_MAX;
5523
5524 for_each_possible_cpu(c) {
5525 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5526 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5527 }
5528
5529 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5530 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5531 }
5532
5533 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5534 int bytes)
5535 {
5536 switch (attrtype) {
5537 case IFLA_INET6_STATS:
5538 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5539 offsetof(struct ipstats_mib, syncp));
5540 break;
5541 case IFLA_INET6_ICMP6STATS:
5542 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5543 break;
5544 }
5545 }
5546
5547 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5548 u32 ext_filter_mask)
5549 {
5550 struct nlattr *nla;
5551 struct ifla_cacheinfo ci;
5552
5553 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5554 goto nla_put_failure;
5555 ci.max_reasm_len = IPV6_MAXPLEN;
5556 ci.tstamp = cstamp_delta(idev->tstamp);
5557 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5558 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5559 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5560 goto nla_put_failure;
5561 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5562 if (!nla)
5563 goto nla_put_failure;
5564 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5565
5566 /* XXX - MC not implemented */
5567
5568 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5569 return 0;
5570
5571 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5572 if (!nla)
5573 goto nla_put_failure;
5574 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5575
5576 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5577 if (!nla)
5578 goto nla_put_failure;
5579 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5580
5581 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5582 if (!nla)
5583 goto nla_put_failure;
5584 read_lock_bh(&idev->lock);
5585 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5586 read_unlock_bh(&idev->lock);
5587
5588 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5589 goto nla_put_failure;
5590
5591 return 0;
5592
5593 nla_put_failure:
5594 return -EMSGSIZE;
5595 }
5596
5597 static size_t inet6_get_link_af_size(const struct net_device *dev,
5598 u32 ext_filter_mask)
5599 {
5600 if (!__in6_dev_get(dev))
5601 return 0;
5602
5603 return inet6_ifla6_size();
5604 }
5605
5606 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5607 u32 ext_filter_mask)
5608 {
5609 struct inet6_dev *idev = __in6_dev_get(dev);
5610
5611 if (!idev)
5612 return -ENODATA;
5613
5614 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5615 return -EMSGSIZE;
5616
5617 return 0;
5618 }
5619
5620 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5621 {
5622 struct inet6_ifaddr *ifp;
5623 struct net_device *dev = idev->dev;
5624 bool clear_token, update_rs = false;
5625 struct in6_addr ll_addr;
5626
5627 ASSERT_RTNL();
5628
5629 if (!token)
5630 return -EINVAL;
5631 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5632 return -EINVAL;
5633 if (!ipv6_accept_ra(idev))
5634 return -EINVAL;
5635 if (idev->cnf.rtr_solicits == 0)
5636 return -EINVAL;
5637
5638 write_lock_bh(&idev->lock);
5639
5640 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5641 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5642
5643 write_unlock_bh(&idev->lock);
5644
5645 clear_token = ipv6_addr_any(token);
5646 if (clear_token)
5647 goto update_lft;
5648
5649 if (!idev->dead && (idev->if_flags & IF_READY) &&
5650 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5651 IFA_F_OPTIMISTIC)) {
5652 /* If we're not ready, then normal ifup will take care
5653 * of this. Otherwise, we need to request our rs here.
5654 */
5655 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5656 update_rs = true;
5657 }
5658
5659 update_lft:
5660 write_lock_bh(&idev->lock);
5661
5662 if (update_rs) {
5663 idev->if_flags |= IF_RS_SENT;
5664 idev->rs_interval = rfc3315_s14_backoff_init(
5665 idev->cnf.rtr_solicit_interval);
5666 idev->rs_probes = 1;
5667 addrconf_mod_rs_timer(idev, idev->rs_interval);
5668 }
5669
5670 /* Well, that's kinda nasty ... */
5671 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5672 spin_lock(&ifp->lock);
5673 if (ifp->tokenized) {
5674 ifp->valid_lft = 0;
5675 ifp->prefered_lft = 0;
5676 }
5677 spin_unlock(&ifp->lock);
5678 }
5679
5680 write_unlock_bh(&idev->lock);
5681 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5682 addrconf_verify_rtnl();
5683 return 0;
5684 }
5685
5686 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5687 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5688 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5689 };
5690
5691 static int check_addr_gen_mode(int mode)
5692 {
5693 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5694 mode != IN6_ADDR_GEN_MODE_NONE &&
5695 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5696 mode != IN6_ADDR_GEN_MODE_RANDOM)
5697 return -EINVAL;
5698 return 1;
5699 }
5700
5701 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5702 int mode)
5703 {
5704 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5705 !idev->cnf.stable_secret.initialized &&
5706 !net->ipv6.devconf_dflt->stable_secret.initialized)
5707 return -EINVAL;
5708 return 1;
5709 }
5710
5711 static int inet6_validate_link_af(const struct net_device *dev,
5712 const struct nlattr *nla)
5713 {
5714 struct nlattr *tb[IFLA_INET6_MAX + 1];
5715 struct inet6_dev *idev = NULL;
5716 int err;
5717
5718 if (dev) {
5719 idev = __in6_dev_get(dev);
5720 if (!idev)
5721 return -EAFNOSUPPORT;
5722 }
5723
5724 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5725 inet6_af_policy, NULL);
5726 if (err)
5727 return err;
5728
5729 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5730 return -EINVAL;
5731
5732 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5733 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5734
5735 if (check_addr_gen_mode(mode) < 0)
5736 return -EINVAL;
5737 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5738 return -EINVAL;
5739 }
5740
5741 return 0;
5742 }
5743
5744 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5745 {
5746 struct inet6_dev *idev = __in6_dev_get(dev);
5747 struct nlattr *tb[IFLA_INET6_MAX + 1];
5748 int err;
5749
5750 if (!idev)
5751 return -EAFNOSUPPORT;
5752
5753 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5754 BUG();
5755
5756 if (tb[IFLA_INET6_TOKEN]) {
5757 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5758 if (err)
5759 return err;
5760 }
5761
5762 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5763 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5764
5765 idev->cnf.addr_gen_mode = mode;
5766 }
5767
5768 return 0;
5769 }
5770
5771 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5772 u32 portid, u32 seq, int event, unsigned int flags)
5773 {
5774 struct net_device *dev = idev->dev;
5775 struct ifinfomsg *hdr;
5776 struct nlmsghdr *nlh;
5777 void *protoinfo;
5778
5779 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5780 if (!nlh)
5781 return -EMSGSIZE;
5782
5783 hdr = nlmsg_data(nlh);
5784 hdr->ifi_family = AF_INET6;
5785 hdr->__ifi_pad = 0;
5786 hdr->ifi_type = dev->type;
5787 hdr->ifi_index = dev->ifindex;
5788 hdr->ifi_flags = dev_get_flags(dev);
5789 hdr->ifi_change = 0;
5790
5791 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5792 (dev->addr_len &&
5793 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5794 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5795 (dev->ifindex != dev_get_iflink(dev) &&
5796 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5797 nla_put_u8(skb, IFLA_OPERSTATE,
5798 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5799 goto nla_put_failure;
5800 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5801 if (!protoinfo)
5802 goto nla_put_failure;
5803
5804 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5805 goto nla_put_failure;
5806
5807 nla_nest_end(skb, protoinfo);
5808 nlmsg_end(skb, nlh);
5809 return 0;
5810
5811 nla_put_failure:
5812 nlmsg_cancel(skb, nlh);
5813 return -EMSGSIZE;
5814 }
5815
5816 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5817 struct netlink_ext_ack *extack)
5818 {
5819 struct ifinfomsg *ifm;
5820
5821 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5822 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5823 return -EINVAL;
5824 }
5825
5826 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5827 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5828 return -EINVAL;
5829 }
5830
5831 ifm = nlmsg_data(nlh);
5832 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5833 ifm->ifi_change || ifm->ifi_index) {
5834 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5835 return -EINVAL;
5836 }
5837
5838 return 0;
5839 }
5840
5841 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5842 {
5843 struct net *net = sock_net(skb->sk);
5844 int h, s_h;
5845 int idx = 0, s_idx;
5846 struct net_device *dev;
5847 struct inet6_dev *idev;
5848 struct hlist_head *head;
5849
5850 /* only requests using strict checking can pass data to
5851 * influence the dump
5852 */
5853 if (cb->strict_check) {
5854 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5855
5856 if (err < 0)
5857 return err;
5858 }
5859
5860 s_h = cb->args[0];
5861 s_idx = cb->args[1];
5862
5863 rcu_read_lock();
5864 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5865 idx = 0;
5866 head = &net->dev_index_head[h];
5867 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5868 if (idx < s_idx)
5869 goto cont;
5870 idev = __in6_dev_get(dev);
5871 if (!idev)
5872 goto cont;
5873 if (inet6_fill_ifinfo(skb, idev,
5874 NETLINK_CB(cb->skb).portid,
5875 cb->nlh->nlmsg_seq,
5876 RTM_NEWLINK, NLM_F_MULTI) < 0)
5877 goto out;
5878 cont:
5879 idx++;
5880 }
5881 }
5882 out:
5883 rcu_read_unlock();
5884 cb->args[1] = idx;
5885 cb->args[0] = h;
5886
5887 return skb->len;
5888 }
5889
5890 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5891 {
5892 struct sk_buff *skb;
5893 struct net *net = dev_net(idev->dev);
5894 int err = -ENOBUFS;
5895
5896 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5897 if (!skb)
5898 goto errout;
5899
5900 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5901 if (err < 0) {
5902 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5903 WARN_ON(err == -EMSGSIZE);
5904 kfree_skb(skb);
5905 goto errout;
5906 }
5907 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5908 return;
5909 errout:
5910 if (err < 0)
5911 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5912 }
5913
5914 static inline size_t inet6_prefix_nlmsg_size(void)
5915 {
5916 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5917 + nla_total_size(sizeof(struct in6_addr))
5918 + nla_total_size(sizeof(struct prefix_cacheinfo));
5919 }
5920
5921 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5922 struct prefix_info *pinfo, u32 portid, u32 seq,
5923 int event, unsigned int flags)
5924 {
5925 struct prefixmsg *pmsg;
5926 struct nlmsghdr *nlh;
5927 struct prefix_cacheinfo ci;
5928
5929 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5930 if (!nlh)
5931 return -EMSGSIZE;
5932
5933 pmsg = nlmsg_data(nlh);
5934 pmsg->prefix_family = AF_INET6;
5935 pmsg->prefix_pad1 = 0;
5936 pmsg->prefix_pad2 = 0;
5937 pmsg->prefix_ifindex = idev->dev->ifindex;
5938 pmsg->prefix_len = pinfo->prefix_len;
5939 pmsg->prefix_type = pinfo->type;
5940 pmsg->prefix_pad3 = 0;
5941 pmsg->prefix_flags = 0;
5942 if (pinfo->onlink)
5943 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5944 if (pinfo->autoconf)
5945 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5946
5947 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5948 goto nla_put_failure;
5949 ci.preferred_time = ntohl(pinfo->prefered);
5950 ci.valid_time = ntohl(pinfo->valid);
5951 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5952 goto nla_put_failure;
5953 nlmsg_end(skb, nlh);
5954 return 0;
5955
5956 nla_put_failure:
5957 nlmsg_cancel(skb, nlh);
5958 return -EMSGSIZE;
5959 }
5960
5961 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5962 struct prefix_info *pinfo)
5963 {
5964 struct sk_buff *skb;
5965 struct net *net = dev_net(idev->dev);
5966 int err = -ENOBUFS;
5967
5968 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5969 if (!skb)
5970 goto errout;
5971
5972 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5973 if (err < 0) {
5974 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5975 WARN_ON(err == -EMSGSIZE);
5976 kfree_skb(skb);
5977 goto errout;
5978 }
5979 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5980 return;
5981 errout:
5982 if (err < 0)
5983 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5984 }
5985
5986 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5987 {
5988 struct net *net = dev_net(ifp->idev->dev);
5989
5990 if (event)
5991 ASSERT_RTNL();
5992
5993 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5994
5995 switch (event) {
5996 case RTM_NEWADDR:
5997 /*
5998 * If the address was optimistic we inserted the route at the
5999 * start of our DAD process, so we don't need to do it again.
6000 * If the device was taken down in the middle of the DAD
6001 * cycle there is a race where we could get here without a
6002 * host route, so nothing to insert. That will be fixed when
6003 * the device is brought up.
6004 */
6005 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6006 ip6_ins_rt(net, ifp->rt);
6007 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6008 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6009 &ifp->addr, ifp->idev->dev->name);
6010 }
6011
6012 if (ifp->idev->cnf.forwarding)
6013 addrconf_join_anycast(ifp);
6014 if (!ipv6_addr_any(&ifp->peer_addr))
6015 addrconf_prefix_route(&ifp->peer_addr, 128,
6016 ifp->rt_priority, ifp->idev->dev,
6017 0, 0, GFP_ATOMIC);
6018 break;
6019 case RTM_DELADDR:
6020 if (ifp->idev->cnf.forwarding)
6021 addrconf_leave_anycast(ifp);
6022 addrconf_leave_solict(ifp->idev, &ifp->addr);
6023 if (!ipv6_addr_any(&ifp->peer_addr)) {
6024 struct fib6_info *rt;
6025
6026 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6027 ifp->idev->dev, 0, 0,
6028 false);
6029 if (rt)
6030 ip6_del_rt(net, rt);
6031 }
6032 if (ifp->rt) {
6033 ip6_del_rt(net, ifp->rt);
6034 ifp->rt = NULL;
6035 }
6036 rt_genid_bump_ipv6(net);
6037 break;
6038 }
6039 atomic_inc(&net->ipv6.dev_addr_genid);
6040 }
6041
6042 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6043 {
6044 rcu_read_lock_bh();
6045 if (likely(ifp->idev->dead == 0))
6046 __ipv6_ifa_notify(event, ifp);
6047 rcu_read_unlock_bh();
6048 }
6049
6050 #ifdef CONFIG_SYSCTL
6051
6052 static
6053 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6054 void __user *buffer, size_t *lenp, loff_t *ppos)
6055 {
6056 int *valp = ctl->data;
6057 int val = *valp;
6058 loff_t pos = *ppos;
6059 struct ctl_table lctl;
6060 int ret;
6061
6062 /*
6063 * ctl->data points to idev->cnf.forwarding, we should
6064 * not modify it until we get the rtnl lock.
6065 */
6066 lctl = *ctl;
6067 lctl.data = &val;
6068
6069 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6070
6071 if (write)
6072 ret = addrconf_fixup_forwarding(ctl, valp, val);
6073 if (ret)
6074 *ppos = pos;
6075 return ret;
6076 }
6077
6078 static
6079 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6080 void __user *buffer, size_t *lenp, loff_t *ppos)
6081 {
6082 struct inet6_dev *idev = ctl->extra1;
6083 int min_mtu = IPV6_MIN_MTU;
6084 struct ctl_table lctl;
6085
6086 lctl = *ctl;
6087 lctl.extra1 = &min_mtu;
6088 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6089
6090 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6091 }
6092
6093 static void dev_disable_change(struct inet6_dev *idev)
6094 {
6095 struct netdev_notifier_info info;
6096
6097 if (!idev || !idev->dev)
6098 return;
6099
6100 netdev_notifier_info_init(&info, idev->dev);
6101 if (idev->cnf.disable_ipv6)
6102 addrconf_notify(NULL, NETDEV_DOWN, &info);
6103 else
6104 addrconf_notify(NULL, NETDEV_UP, &info);
6105 }
6106
6107 static void addrconf_disable_change(struct net *net, __s32 newf)
6108 {
6109 struct net_device *dev;
6110 struct inet6_dev *idev;
6111
6112 for_each_netdev(net, dev) {
6113 idev = __in6_dev_get(dev);
6114 if (idev) {
6115 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6116 idev->cnf.disable_ipv6 = newf;
6117 if (changed)
6118 dev_disable_change(idev);
6119 }
6120 }
6121 }
6122
6123 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6124 {
6125 struct net *net;
6126 int old;
6127
6128 if (!rtnl_trylock())
6129 return restart_syscall();
6130
6131 net = (struct net *)table->extra2;
6132 old = *p;
6133 *p = newf;
6134
6135 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6136 rtnl_unlock();
6137 return 0;
6138 }
6139
6140 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6141 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6142 addrconf_disable_change(net, newf);
6143 } else if ((!newf) ^ (!old))
6144 dev_disable_change((struct inet6_dev *)table->extra1);
6145
6146 rtnl_unlock();
6147 return 0;
6148 }
6149
6150 static
6151 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6152 void __user *buffer, size_t *lenp, loff_t *ppos)
6153 {
6154 int *valp = ctl->data;
6155 int val = *valp;
6156 loff_t pos = *ppos;
6157 struct ctl_table lctl;
6158 int ret;
6159
6160 /*
6161 * ctl->data points to idev->cnf.disable_ipv6, we should
6162 * not modify it until we get the rtnl lock.
6163 */
6164 lctl = *ctl;
6165 lctl.data = &val;
6166
6167 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6168
6169 if (write)
6170 ret = addrconf_disable_ipv6(ctl, valp, val);
6171 if (ret)
6172 *ppos = pos;
6173 return ret;
6174 }
6175
6176 static
6177 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6178 void __user *buffer, size_t *lenp, loff_t *ppos)
6179 {
6180 int *valp = ctl->data;
6181 int ret;
6182 int old, new;
6183
6184 old = *valp;
6185 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6186 new = *valp;
6187
6188 if (write && old != new) {
6189 struct net *net = ctl->extra2;
6190
6191 if (!rtnl_trylock())
6192 return restart_syscall();
6193
6194 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6195 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6196 NETCONFA_PROXY_NEIGH,
6197 NETCONFA_IFINDEX_DEFAULT,
6198 net->ipv6.devconf_dflt);
6199 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6200 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6201 NETCONFA_PROXY_NEIGH,
6202 NETCONFA_IFINDEX_ALL,
6203 net->ipv6.devconf_all);
6204 else {
6205 struct inet6_dev *idev = ctl->extra1;
6206
6207 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6208 NETCONFA_PROXY_NEIGH,
6209 idev->dev->ifindex,
6210 &idev->cnf);
6211 }
6212 rtnl_unlock();
6213 }
6214
6215 return ret;
6216 }
6217
6218 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6219 void __user *buffer, size_t *lenp,
6220 loff_t *ppos)
6221 {
6222 int ret = 0;
6223 u32 new_val;
6224 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6225 struct net *net = (struct net *)ctl->extra2;
6226 struct ctl_table tmp = {
6227 .data = &new_val,
6228 .maxlen = sizeof(new_val),
6229 .mode = ctl->mode,
6230 };
6231
6232 if (!rtnl_trylock())
6233 return restart_syscall();
6234
6235 new_val = *((u32 *)ctl->data);
6236
6237 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6238 if (ret != 0)
6239 goto out;
6240
6241 if (write) {
6242 if (check_addr_gen_mode(new_val) < 0) {
6243 ret = -EINVAL;
6244 goto out;
6245 }
6246
6247 if (idev) {
6248 if (check_stable_privacy(idev, net, new_val) < 0) {
6249 ret = -EINVAL;
6250 goto out;
6251 }
6252
6253 if (idev->cnf.addr_gen_mode != new_val) {
6254 idev->cnf.addr_gen_mode = new_val;
6255 addrconf_dev_config(idev->dev);
6256 }
6257 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6258 struct net_device *dev;
6259
6260 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6261 for_each_netdev(net, dev) {
6262 idev = __in6_dev_get(dev);
6263 if (idev &&
6264 idev->cnf.addr_gen_mode != new_val) {
6265 idev->cnf.addr_gen_mode = new_val;
6266 addrconf_dev_config(idev->dev);
6267 }
6268 }
6269 }
6270
6271 *((u32 *)ctl->data) = new_val;
6272 }
6273
6274 out:
6275 rtnl_unlock();
6276
6277 return ret;
6278 }
6279
6280 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6281 void __user *buffer, size_t *lenp,
6282 loff_t *ppos)
6283 {
6284 int err;
6285 struct in6_addr addr;
6286 char str[IPV6_MAX_STRLEN];
6287 struct ctl_table lctl = *ctl;
6288 struct net *net = ctl->extra2;
6289 struct ipv6_stable_secret *secret = ctl->data;
6290
6291 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6292 return -EIO;
6293
6294 lctl.maxlen = IPV6_MAX_STRLEN;
6295 lctl.data = str;
6296
6297 if (!rtnl_trylock())
6298 return restart_syscall();
6299
6300 if (!write && !secret->initialized) {
6301 err = -EIO;
6302 goto out;
6303 }
6304
6305 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6306 if (err >= sizeof(str)) {
6307 err = -EIO;
6308 goto out;
6309 }
6310
6311 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6312 if (err || !write)
6313 goto out;
6314
6315 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6316 err = -EIO;
6317 goto out;
6318 }
6319
6320 secret->initialized = true;
6321 secret->secret = addr;
6322
6323 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6324 struct net_device *dev;
6325
6326 for_each_netdev(net, dev) {
6327 struct inet6_dev *idev = __in6_dev_get(dev);
6328
6329 if (idev) {
6330 idev->cnf.addr_gen_mode =
6331 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6332 }
6333 }
6334 } else {
6335 struct inet6_dev *idev = ctl->extra1;
6336
6337 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6338 }
6339
6340 out:
6341 rtnl_unlock();
6342
6343 return err;
6344 }
6345
6346 static
6347 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6348 int write,
6349 void __user *buffer,
6350 size_t *lenp,
6351 loff_t *ppos)
6352 {
6353 int *valp = ctl->data;
6354 int val = *valp;
6355 loff_t pos = *ppos;
6356 struct ctl_table lctl;
6357 int ret;
6358
6359 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6360 * we should not modify it until we get the rtnl lock.
6361 */
6362 lctl = *ctl;
6363 lctl.data = &val;
6364
6365 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6366
6367 if (write)
6368 ret = addrconf_fixup_linkdown(ctl, valp, val);
6369 if (ret)
6370 *ppos = pos;
6371 return ret;
6372 }
6373
6374 static
6375 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6376 {
6377 if (rt) {
6378 if (action)
6379 rt->dst.flags |= DST_NOPOLICY;
6380 else
6381 rt->dst.flags &= ~DST_NOPOLICY;
6382 }
6383 }
6384
6385 static
6386 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6387 {
6388 struct inet6_ifaddr *ifa;
6389
6390 read_lock_bh(&idev->lock);
6391 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6392 spin_lock(&ifa->lock);
6393 if (ifa->rt) {
6394 /* host routes only use builtin fib6_nh */
6395 struct fib6_nh *nh = ifa->rt->fib6_nh;
6396 int cpu;
6397
6398 rcu_read_lock();
6399 ifa->rt->dst_nopolicy = val ? true : false;
6400 if (nh->rt6i_pcpu) {
6401 for_each_possible_cpu(cpu) {
6402 struct rt6_info **rtp;
6403
6404 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6405 addrconf_set_nopolicy(*rtp, val);
6406 }
6407 }
6408 rcu_read_unlock();
6409 }
6410 spin_unlock(&ifa->lock);
6411 }
6412 read_unlock_bh(&idev->lock);
6413 }
6414
6415 static
6416 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6417 {
6418 struct inet6_dev *idev;
6419 struct net *net;
6420
6421 if (!rtnl_trylock())
6422 return restart_syscall();
6423
6424 *valp = val;
6425
6426 net = (struct net *)ctl->extra2;
6427 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6428 rtnl_unlock();
6429 return 0;
6430 }
6431
6432 if (valp == &net->ipv6.devconf_all->disable_policy) {
6433 struct net_device *dev;
6434
6435 for_each_netdev(net, dev) {
6436 idev = __in6_dev_get(dev);
6437 if (idev)
6438 addrconf_disable_policy_idev(idev, val);
6439 }
6440 } else {
6441 idev = (struct inet6_dev *)ctl->extra1;
6442 addrconf_disable_policy_idev(idev, val);
6443 }
6444
6445 rtnl_unlock();
6446 return 0;
6447 }
6448
6449 static
6450 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6451 void __user *buffer, size_t *lenp,
6452 loff_t *ppos)
6453 {
6454 int *valp = ctl->data;
6455 int val = *valp;
6456 loff_t pos = *ppos;
6457 struct ctl_table lctl;
6458 int ret;
6459
6460 lctl = *ctl;
6461 lctl.data = &val;
6462 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6463
6464 if (write && (*valp != val))
6465 ret = addrconf_disable_policy(ctl, valp, val);
6466
6467 if (ret)
6468 *ppos = pos;
6469
6470 return ret;
6471 }
6472
6473 static int minus_one = -1;
6474 static const int two_five_five = 255;
6475
6476 static const struct ctl_table addrconf_sysctl[] = {
6477 {
6478 .procname = "forwarding",
6479 .data = &ipv6_devconf.forwarding,
6480 .maxlen = sizeof(int),
6481 .mode = 0644,
6482 .proc_handler = addrconf_sysctl_forward,
6483 },
6484 {
6485 .procname = "hop_limit",
6486 .data = &ipv6_devconf.hop_limit,
6487 .maxlen = sizeof(int),
6488 .mode = 0644,
6489 .proc_handler = proc_dointvec_minmax,
6490 .extra1 = (void *)SYSCTL_ONE,
6491 .extra2 = (void *)&two_five_five,
6492 },
6493 {
6494 .procname = "mtu",
6495 .data = &ipv6_devconf.mtu6,
6496 .maxlen = sizeof(int),
6497 .mode = 0644,
6498 .proc_handler = addrconf_sysctl_mtu,
6499 },
6500 {
6501 .procname = "accept_ra",
6502 .data = &ipv6_devconf.accept_ra,
6503 .maxlen = sizeof(int),
6504 .mode = 0644,
6505 .proc_handler = proc_dointvec,
6506 },
6507 {
6508 .procname = "accept_redirects",
6509 .data = &ipv6_devconf.accept_redirects,
6510 .maxlen = sizeof(int),
6511 .mode = 0644,
6512 .proc_handler = proc_dointvec,
6513 },
6514 {
6515 .procname = "autoconf",
6516 .data = &ipv6_devconf.autoconf,
6517 .maxlen = sizeof(int),
6518 .mode = 0644,
6519 .proc_handler = proc_dointvec,
6520 },
6521 {
6522 .procname = "dad_transmits",
6523 .data = &ipv6_devconf.dad_transmits,
6524 .maxlen = sizeof(int),
6525 .mode = 0644,
6526 .proc_handler = proc_dointvec,
6527 },
6528 {
6529 .procname = "router_solicitations",
6530 .data = &ipv6_devconf.rtr_solicits,
6531 .maxlen = sizeof(int),
6532 .mode = 0644,
6533 .proc_handler = proc_dointvec_minmax,
6534 .extra1 = &minus_one,
6535 },
6536 {
6537 .procname = "router_solicitation_interval",
6538 .data = &ipv6_devconf.rtr_solicit_interval,
6539 .maxlen = sizeof(int),
6540 .mode = 0644,
6541 .proc_handler = proc_dointvec_jiffies,
6542 },
6543 {
6544 .procname = "router_solicitation_max_interval",
6545 .data = &ipv6_devconf.rtr_solicit_max_interval,
6546 .maxlen = sizeof(int),
6547 .mode = 0644,
6548 .proc_handler = proc_dointvec_jiffies,
6549 },
6550 {
6551 .procname = "router_solicitation_delay",
6552 .data = &ipv6_devconf.rtr_solicit_delay,
6553 .maxlen = sizeof(int),
6554 .mode = 0644,
6555 .proc_handler = proc_dointvec_jiffies,
6556 },
6557 {
6558 .procname = "force_mld_version",
6559 .data = &ipv6_devconf.force_mld_version,
6560 .maxlen = sizeof(int),
6561 .mode = 0644,
6562 .proc_handler = proc_dointvec,
6563 },
6564 {
6565 .procname = "mldv1_unsolicited_report_interval",
6566 .data =
6567 &ipv6_devconf.mldv1_unsolicited_report_interval,
6568 .maxlen = sizeof(int),
6569 .mode = 0644,
6570 .proc_handler = proc_dointvec_ms_jiffies,
6571 },
6572 {
6573 .procname = "mldv2_unsolicited_report_interval",
6574 .data =
6575 &ipv6_devconf.mldv2_unsolicited_report_interval,
6576 .maxlen = sizeof(int),
6577 .mode = 0644,
6578 .proc_handler = proc_dointvec_ms_jiffies,
6579 },
6580 {
6581 .procname = "use_tempaddr",
6582 .data = &ipv6_devconf.use_tempaddr,
6583 .maxlen = sizeof(int),
6584 .mode = 0644,
6585 .proc_handler = proc_dointvec,
6586 },
6587 {
6588 .procname = "temp_valid_lft",
6589 .data = &ipv6_devconf.temp_valid_lft,
6590 .maxlen = sizeof(int),
6591 .mode = 0644,
6592 .proc_handler = proc_dointvec,
6593 },
6594 {
6595 .procname = "temp_prefered_lft",
6596 .data = &ipv6_devconf.temp_prefered_lft,
6597 .maxlen = sizeof(int),
6598 .mode = 0644,
6599 .proc_handler = proc_dointvec,
6600 },
6601 {
6602 .procname = "regen_max_retry",
6603 .data = &ipv6_devconf.regen_max_retry,
6604 .maxlen = sizeof(int),
6605 .mode = 0644,
6606 .proc_handler = proc_dointvec,
6607 },
6608 {
6609 .procname = "max_desync_factor",
6610 .data = &ipv6_devconf.max_desync_factor,
6611 .maxlen = sizeof(int),
6612 .mode = 0644,
6613 .proc_handler = proc_dointvec,
6614 },
6615 {
6616 .procname = "max_addresses",
6617 .data = &ipv6_devconf.max_addresses,
6618 .maxlen = sizeof(int),
6619 .mode = 0644,
6620 .proc_handler = proc_dointvec,
6621 },
6622 {
6623 .procname = "accept_ra_defrtr",
6624 .data = &ipv6_devconf.accept_ra_defrtr,
6625 .maxlen = sizeof(int),
6626 .mode = 0644,
6627 .proc_handler = proc_dointvec,
6628 },
6629 {
6630 .procname = "accept_ra_min_hop_limit",
6631 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6632 .maxlen = sizeof(int),
6633 .mode = 0644,
6634 .proc_handler = proc_dointvec,
6635 },
6636 {
6637 .procname = "accept_ra_pinfo",
6638 .data = &ipv6_devconf.accept_ra_pinfo,
6639 .maxlen = sizeof(int),
6640 .mode = 0644,
6641 .proc_handler = proc_dointvec,
6642 },
6643 #ifdef CONFIG_IPV6_ROUTER_PREF
6644 {
6645 .procname = "accept_ra_rtr_pref",
6646 .data = &ipv6_devconf.accept_ra_rtr_pref,
6647 .maxlen = sizeof(int),
6648 .mode = 0644,
6649 .proc_handler = proc_dointvec,
6650 },
6651 {
6652 .procname = "router_probe_interval",
6653 .data = &ipv6_devconf.rtr_probe_interval,
6654 .maxlen = sizeof(int),
6655 .mode = 0644,
6656 .proc_handler = proc_dointvec_jiffies,
6657 },
6658 #ifdef CONFIG_IPV6_ROUTE_INFO
6659 {
6660 .procname = "accept_ra_rt_info_min_plen",
6661 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6662 .maxlen = sizeof(int),
6663 .mode = 0644,
6664 .proc_handler = proc_dointvec,
6665 },
6666 {
6667 .procname = "accept_ra_rt_info_max_plen",
6668 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6669 .maxlen = sizeof(int),
6670 .mode = 0644,
6671 .proc_handler = proc_dointvec,
6672 },
6673 #endif
6674 #endif
6675 {
6676 .procname = "proxy_ndp",
6677 .data = &ipv6_devconf.proxy_ndp,
6678 .maxlen = sizeof(int),
6679 .mode = 0644,
6680 .proc_handler = addrconf_sysctl_proxy_ndp,
6681 },
6682 {
6683 .procname = "accept_source_route",
6684 .data = &ipv6_devconf.accept_source_route,
6685 .maxlen = sizeof(int),
6686 .mode = 0644,
6687 .proc_handler = proc_dointvec,
6688 },
6689 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6690 {
6691 .procname = "optimistic_dad",
6692 .data = &ipv6_devconf.optimistic_dad,
6693 .maxlen = sizeof(int),
6694 .mode = 0644,
6695 .proc_handler = proc_dointvec,
6696 },
6697 {
6698 .procname = "use_optimistic",
6699 .data = &ipv6_devconf.use_optimistic,
6700 .maxlen = sizeof(int),
6701 .mode = 0644,
6702 .proc_handler = proc_dointvec,
6703 },
6704 #endif
6705 #ifdef CONFIG_IPV6_MROUTE
6706 {
6707 .procname = "mc_forwarding",
6708 .data = &ipv6_devconf.mc_forwarding,
6709 .maxlen = sizeof(int),
6710 .mode = 0444,
6711 .proc_handler = proc_dointvec,
6712 },
6713 #endif
6714 {
6715 .procname = "disable_ipv6",
6716 .data = &ipv6_devconf.disable_ipv6,
6717 .maxlen = sizeof(int),
6718 .mode = 0644,
6719 .proc_handler = addrconf_sysctl_disable,
6720 },
6721 {
6722 .procname = "accept_dad",
6723 .data = &ipv6_devconf.accept_dad,
6724 .maxlen = sizeof(int),
6725 .mode = 0644,
6726 .proc_handler = proc_dointvec,
6727 },
6728 {
6729 .procname = "force_tllao",
6730 .data = &ipv6_devconf.force_tllao,
6731 .maxlen = sizeof(int),
6732 .mode = 0644,
6733 .proc_handler = proc_dointvec
6734 },
6735 {
6736 .procname = "ndisc_notify",
6737 .data = &ipv6_devconf.ndisc_notify,
6738 .maxlen = sizeof(int),
6739 .mode = 0644,
6740 .proc_handler = proc_dointvec
6741 },
6742 {
6743 .procname = "suppress_frag_ndisc",
6744 .data = &ipv6_devconf.suppress_frag_ndisc,
6745 .maxlen = sizeof(int),
6746 .mode = 0644,
6747 .proc_handler = proc_dointvec
6748 },
6749 {
6750 .procname = "accept_ra_from_local",
6751 .data = &ipv6_devconf.accept_ra_from_local,
6752 .maxlen = sizeof(int),
6753 .mode = 0644,
6754 .proc_handler = proc_dointvec,
6755 },
6756 {
6757 .procname = "accept_ra_mtu",
6758 .data = &ipv6_devconf.accept_ra_mtu,
6759 .maxlen = sizeof(int),
6760 .mode = 0644,
6761 .proc_handler = proc_dointvec,
6762 },
6763 {
6764 .procname = "stable_secret",
6765 .data = &ipv6_devconf.stable_secret,
6766 .maxlen = IPV6_MAX_STRLEN,
6767 .mode = 0600,
6768 .proc_handler = addrconf_sysctl_stable_secret,
6769 },
6770 {
6771 .procname = "use_oif_addrs_only",
6772 .data = &ipv6_devconf.use_oif_addrs_only,
6773 .maxlen = sizeof(int),
6774 .mode = 0644,
6775 .proc_handler = proc_dointvec,
6776 },
6777 {
6778 .procname = "ignore_routes_with_linkdown",
6779 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6780 .maxlen = sizeof(int),
6781 .mode = 0644,
6782 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6783 },
6784 {
6785 .procname = "drop_unicast_in_l2_multicast",
6786 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6787 .maxlen = sizeof(int),
6788 .mode = 0644,
6789 .proc_handler = proc_dointvec,
6790 },
6791 {
6792 .procname = "drop_unsolicited_na",
6793 .data = &ipv6_devconf.drop_unsolicited_na,
6794 .maxlen = sizeof(int),
6795 .mode = 0644,
6796 .proc_handler = proc_dointvec,
6797 },
6798 {
6799 .procname = "keep_addr_on_down",
6800 .data = &ipv6_devconf.keep_addr_on_down,
6801 .maxlen = sizeof(int),
6802 .mode = 0644,
6803 .proc_handler = proc_dointvec,
6804
6805 },
6806 {
6807 .procname = "seg6_enabled",
6808 .data = &ipv6_devconf.seg6_enabled,
6809 .maxlen = sizeof(int),
6810 .mode = 0644,
6811 .proc_handler = proc_dointvec,
6812 },
6813 #ifdef CONFIG_IPV6_SEG6_HMAC
6814 {
6815 .procname = "seg6_require_hmac",
6816 .data = &ipv6_devconf.seg6_require_hmac,
6817 .maxlen = sizeof(int),
6818 .mode = 0644,
6819 .proc_handler = proc_dointvec,
6820 },
6821 #endif
6822 {
6823 .procname = "enhanced_dad",
6824 .data = &ipv6_devconf.enhanced_dad,
6825 .maxlen = sizeof(int),
6826 .mode = 0644,
6827 .proc_handler = proc_dointvec,
6828 },
6829 {
6830 .procname = "addr_gen_mode",
6831 .data = &ipv6_devconf.addr_gen_mode,
6832 .maxlen = sizeof(int),
6833 .mode = 0644,
6834 .proc_handler = addrconf_sysctl_addr_gen_mode,
6835 },
6836 {
6837 .procname = "disable_policy",
6838 .data = &ipv6_devconf.disable_policy,
6839 .maxlen = sizeof(int),
6840 .mode = 0644,
6841 .proc_handler = addrconf_sysctl_disable_policy,
6842 },
6843 {
6844 .procname = "ndisc_tclass",
6845 .data = &ipv6_devconf.ndisc_tclass,
6846 .maxlen = sizeof(int),
6847 .mode = 0644,
6848 .proc_handler = proc_dointvec_minmax,
6849 .extra1 = (void *)SYSCTL_ZERO,
6850 .extra2 = (void *)&two_five_five,
6851 },
6852 {
6853 /* sentinel */
6854 }
6855 };
6856
6857 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6858 struct inet6_dev *idev, struct ipv6_devconf *p)
6859 {
6860 int i, ifindex;
6861 struct ctl_table *table;
6862 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6863
6864 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6865 if (!table)
6866 goto out;
6867
6868 for (i = 0; table[i].data; i++) {
6869 table[i].data += (char *)p - (char *)&ipv6_devconf;
6870 /* If one of these is already set, then it is not safe to
6871 * overwrite either of them: this makes proc_dointvec_minmax
6872 * usable.
6873 */
6874 if (!table[i].extra1 && !table[i].extra2) {
6875 table[i].extra1 = idev; /* embedded; no ref */
6876 table[i].extra2 = net;
6877 }
6878 }
6879
6880 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6881
6882 p->sysctl_header = register_net_sysctl(net, path, table);
6883 if (!p->sysctl_header)
6884 goto free;
6885
6886 if (!strcmp(dev_name, "all"))
6887 ifindex = NETCONFA_IFINDEX_ALL;
6888 else if (!strcmp(dev_name, "default"))
6889 ifindex = NETCONFA_IFINDEX_DEFAULT;
6890 else
6891 ifindex = idev->dev->ifindex;
6892 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6893 ifindex, p);
6894 return 0;
6895
6896 free:
6897 kfree(table);
6898 out:
6899 return -ENOBUFS;
6900 }
6901
6902 static void __addrconf_sysctl_unregister(struct net *net,
6903 struct ipv6_devconf *p, int ifindex)
6904 {
6905 struct ctl_table *table;
6906
6907 if (!p->sysctl_header)
6908 return;
6909
6910 table = p->sysctl_header->ctl_table_arg;
6911 unregister_net_sysctl_table(p->sysctl_header);
6912 p->sysctl_header = NULL;
6913 kfree(table);
6914
6915 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6916 }
6917
6918 static int addrconf_sysctl_register(struct inet6_dev *idev)
6919 {
6920 int err;
6921
6922 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6923 return -EINVAL;
6924
6925 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6926 &ndisc_ifinfo_sysctl_change);
6927 if (err)
6928 return err;
6929 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6930 idev, &idev->cnf);
6931 if (err)
6932 neigh_sysctl_unregister(idev->nd_parms);
6933
6934 return err;
6935 }
6936
6937 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6938 {
6939 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6940 idev->dev->ifindex);
6941 neigh_sysctl_unregister(idev->nd_parms);
6942 }
6943
6944
6945 #endif
6946
6947 static int __net_init addrconf_init_net(struct net *net)
6948 {
6949 int err = -ENOMEM;
6950 struct ipv6_devconf *all, *dflt;
6951
6952 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6953 if (!all)
6954 goto err_alloc_all;
6955
6956 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6957 if (!dflt)
6958 goto err_alloc_dflt;
6959
6960 if (IS_ENABLED(CONFIG_SYSCTL) &&
6961 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) {
6962 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf));
6963 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt));
6964 }
6965
6966 /* these will be inherited by all namespaces */
6967 dflt->autoconf = ipv6_defaults.autoconf;
6968 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6969
6970 dflt->stable_secret.initialized = false;
6971 all->stable_secret.initialized = false;
6972
6973 net->ipv6.devconf_all = all;
6974 net->ipv6.devconf_dflt = dflt;
6975
6976 #ifdef CONFIG_SYSCTL
6977 err = __addrconf_sysctl_register(net, "all", NULL, all);
6978 if (err < 0)
6979 goto err_reg_all;
6980
6981 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6982 if (err < 0)
6983 goto err_reg_dflt;
6984 #endif
6985 return 0;
6986
6987 #ifdef CONFIG_SYSCTL
6988 err_reg_dflt:
6989 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6990 err_reg_all:
6991 kfree(dflt);
6992 #endif
6993 err_alloc_dflt:
6994 kfree(all);
6995 err_alloc_all:
6996 return err;
6997 }
6998
6999 static void __net_exit addrconf_exit_net(struct net *net)
7000 {
7001 #ifdef CONFIG_SYSCTL
7002 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7003 NETCONFA_IFINDEX_DEFAULT);
7004 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7005 NETCONFA_IFINDEX_ALL);
7006 #endif
7007 kfree(net->ipv6.devconf_dflt);
7008 kfree(net->ipv6.devconf_all);
7009 }
7010
7011 static struct pernet_operations addrconf_ops = {
7012 .init = addrconf_init_net,
7013 .exit = addrconf_exit_net,
7014 };
7015
7016 static struct rtnl_af_ops inet6_ops __read_mostly = {
7017 .family = AF_INET6,
7018 .fill_link_af = inet6_fill_link_af,
7019 .get_link_af_size = inet6_get_link_af_size,
7020 .validate_link_af = inet6_validate_link_af,
7021 .set_link_af = inet6_set_link_af,
7022 };
7023
7024 /*
7025 * Init / cleanup code
7026 */
7027
7028 int __init addrconf_init(void)
7029 {
7030 struct inet6_dev *idev;
7031 int i, err;
7032
7033 err = ipv6_addr_label_init();
7034 if (err < 0) {
7035 pr_crit("%s: cannot initialize default policy table: %d\n",
7036 __func__, err);
7037 goto out;
7038 }
7039
7040 err = register_pernet_subsys(&addrconf_ops);
7041 if (err < 0)
7042 goto out_addrlabel;
7043
7044 addrconf_wq = create_workqueue("ipv6_addrconf");
7045 if (!addrconf_wq) {
7046 err = -ENOMEM;
7047 goto out_nowq;
7048 }
7049
7050 /* The addrconf netdev notifier requires that loopback_dev
7051 * has it's ipv6 private information allocated and setup
7052 * before it can bring up and give link-local addresses
7053 * to other devices which are up.
7054 *
7055 * Unfortunately, loopback_dev is not necessarily the first
7056 * entry in the global dev_base list of net devices. In fact,
7057 * it is likely to be the very last entry on that list.
7058 * So this causes the notifier registry below to try and
7059 * give link-local addresses to all devices besides loopback_dev
7060 * first, then loopback_dev, which cases all the non-loopback_dev
7061 * devices to fail to get a link-local address.
7062 *
7063 * So, as a temporary fix, allocate the ipv6 structure for
7064 * loopback_dev first by hand.
7065 * Longer term, all of the dependencies ipv6 has upon the loopback
7066 * device and it being up should be removed.
7067 */
7068 rtnl_lock();
7069 idev = ipv6_add_dev(init_net.loopback_dev);
7070 rtnl_unlock();
7071 if (IS_ERR(idev)) {
7072 err = PTR_ERR(idev);
7073 goto errlo;
7074 }
7075
7076 ip6_route_init_special_entries();
7077
7078 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7079 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7080
7081 register_netdevice_notifier(&ipv6_dev_notf);
7082
7083 addrconf_verify();
7084
7085 rtnl_af_register(&inet6_ops);
7086
7087 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7088 NULL, inet6_dump_ifinfo, 0);
7089 if (err < 0)
7090 goto errout;
7091
7092 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7093 inet6_rtm_newaddr, NULL, 0);
7094 if (err < 0)
7095 goto errout;
7096 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7097 inet6_rtm_deladdr, NULL, 0);
7098 if (err < 0)
7099 goto errout;
7100 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7101 inet6_rtm_getaddr, inet6_dump_ifaddr,
7102 RTNL_FLAG_DOIT_UNLOCKED);
7103 if (err < 0)
7104 goto errout;
7105 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7106 NULL, inet6_dump_ifmcaddr, 0);
7107 if (err < 0)
7108 goto errout;
7109 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7110 NULL, inet6_dump_ifacaddr, 0);
7111 if (err < 0)
7112 goto errout;
7113 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7114 inet6_netconf_get_devconf,
7115 inet6_netconf_dump_devconf,
7116 RTNL_FLAG_DOIT_UNLOCKED);
7117 if (err < 0)
7118 goto errout;
7119 err = ipv6_addr_label_rtnl_register();
7120 if (err < 0)
7121 goto errout;
7122
7123 return 0;
7124 errout:
7125 rtnl_unregister_all(PF_INET6);
7126 rtnl_af_unregister(&inet6_ops);
7127 unregister_netdevice_notifier(&ipv6_dev_notf);
7128 errlo:
7129 destroy_workqueue(addrconf_wq);
7130 out_nowq:
7131 unregister_pernet_subsys(&addrconf_ops);
7132 out_addrlabel:
7133 ipv6_addr_label_cleanup();
7134 out:
7135 return err;
7136 }
7137
7138 void addrconf_cleanup(void)
7139 {
7140 struct net_device *dev;
7141 int i;
7142
7143 unregister_netdevice_notifier(&ipv6_dev_notf);
7144 unregister_pernet_subsys(&addrconf_ops);
7145 ipv6_addr_label_cleanup();
7146
7147 rtnl_af_unregister(&inet6_ops);
7148
7149 rtnl_lock();
7150
7151 /* clean dev list */
7152 for_each_netdev(&init_net, dev) {
7153 if (__in6_dev_get(dev) == NULL)
7154 continue;
7155 addrconf_ifdown(dev, 1);
7156 }
7157 addrconf_ifdown(init_net.loopback_dev, 2);
7158
7159 /*
7160 * Check hash table.
7161 */
7162 spin_lock_bh(&addrconf_hash_lock);
7163 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7164 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7165 spin_unlock_bh(&addrconf_hash_lock);
7166 cancel_delayed_work(&addr_chk_work);
7167 rtnl_unlock();
7168
7169 destroy_workqueue(addrconf_wq);
7170 }
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