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usb: typec: mux: Take care of driver module reference counting
[linux-2.6/btrfs-unstable.git] / net / ipv6 / addrconf.c
blobd51a8c0b3372d09ad1c78b76f94b4ebaf7ca3f61
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/sched/signal.h>
47 #include <linux/socket.h>
48 #include <linux/sockios.h>
49 #include <linux/net.h>
50 #include <linux/inet.h>
51 #include <linux/in6.h>
52 #include <linux/netdevice.h>
53 #include <linux/if_addr.h>
54 #include <linux/if_arp.h>
55 #include <linux/if_arcnet.h>
56 #include <linux/if_infiniband.h>
57 #include <linux/route.h>
58 #include <linux/inetdevice.h>
59 #include <linux/init.h>
60 #include <linux/slab.h>
61 #ifdef CONFIG_SYSCTL
62 #include <linux/sysctl.h>
63 #endif
64 #include <linux/capability.h>
65 #include <linux/delay.h>
66 #include <linux/notifier.h>
67 #include <linux/string.h>
68 #include <linux/hash.h>
69
70 #include <net/net_namespace.h>
71 #include <net/sock.h>
72 #include <net/snmp.h>
73
74 #include <net/6lowpan.h>
75 #include <net/firewire.h>
76 #include <net/ipv6.h>
77 #include <net/protocol.h>
78 #include <net/ndisc.h>
79 #include <net/ip6_route.h>
80 #include <net/addrconf.h>
81 #include <net/tcp.h>
82 #include <net/ip.h>
83 #include <net/netlink.h>
84 #include <net/pkt_sched.h>
85 #include <net/l3mdev.h>
86 #include <linux/if_tunnel.h>
87 #include <linux/rtnetlink.h>
88 #include <linux/netconf.h>
89 #include <linux/random.h>
90 #include <linux/uaccess.h>
91 #include <asm/unaligned.h>
92
93 #include <linux/proc_fs.h>
94 #include <linux/seq_file.h>
95 #include <linux/export.h>
96
97 #define INFINITY_LIFE_TIME 0xFFFFFFFF
98
99 #define IPV6_MAX_STRLEN \
100 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
101
102 static inline u32 cstamp_delta(unsigned long cstamp)
103 {
104 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
105 }
106
107 static inline s32 rfc3315_s14_backoff_init(s32 irt)
108 {
109 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
110 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
111 do_div(tmp, 1000000);
112 return (s32)tmp;
113 }
114
115 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
116 {
117 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
118 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
119 do_div(tmp, 1000000);
120 if ((s32)tmp > mrt) {
121 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
122 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
123 do_div(tmp, 1000000);
124 }
125 return (s32)tmp;
126 }
127
128 #ifdef CONFIG_SYSCTL
129 static int addrconf_sysctl_register(struct inet6_dev *idev);
130 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
131 #else
132 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
133 {
134 return 0;
135 }
136
137 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
138 {
139 }
140 #endif
141
142 static void ipv6_regen_rndid(struct inet6_dev *idev);
143 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
144
145 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
146 static int ipv6_count_addresses(const struct inet6_dev *idev);
147 static int ipv6_generate_stable_address(struct in6_addr *addr,
148 u8 dad_count,
149 const struct inet6_dev *idev);
150
151 #define IN6_ADDR_HSIZE_SHIFT 8
152 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
153 /*
154 * Configured unicast address hash table
155 */
156 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
157 static DEFINE_SPINLOCK(addrconf_hash_lock);
158
159 static void addrconf_verify(void);
160 static void addrconf_verify_rtnl(void);
161 static void addrconf_verify_work(struct work_struct *);
162
163 static struct workqueue_struct *addrconf_wq;
164 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
165
166 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
167 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
168
169 static void addrconf_type_change(struct net_device *dev,
170 unsigned long event);
171 static int addrconf_ifdown(struct net_device *dev, int how);
172
173 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
174 int plen,
175 const struct net_device *dev,
176 u32 flags, u32 noflags);
177
178 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
179 static void addrconf_dad_work(struct work_struct *w);
180 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
181 bool send_na);
182 static void addrconf_dad_run(struct inet6_dev *idev);
183 static void addrconf_rs_timer(struct timer_list *t);
184 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
185 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
186
187 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
188 struct prefix_info *pinfo);
189
190 static struct ipv6_devconf ipv6_devconf __read_mostly = {
191 .forwarding = 0,
192 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
193 .mtu6 = IPV6_MIN_MTU,
194 .accept_ra = 1,
195 .accept_redirects = 1,
196 .autoconf = 1,
197 .force_mld_version = 0,
198 .mldv1_unsolicited_report_interval = 10 * HZ,
199 .mldv2_unsolicited_report_interval = HZ,
200 .dad_transmits = 1,
201 .rtr_solicits = MAX_RTR_SOLICITATIONS,
202 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
203 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
204 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
205 .use_tempaddr = 0,
206 .temp_valid_lft = TEMP_VALID_LIFETIME,
207 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
208 .regen_max_retry = REGEN_MAX_RETRY,
209 .max_desync_factor = MAX_DESYNC_FACTOR,
210 .max_addresses = IPV6_MAX_ADDRESSES,
211 .accept_ra_defrtr = 1,
212 .accept_ra_from_local = 0,
213 .accept_ra_min_hop_limit= 1,
214 .accept_ra_pinfo = 1,
215 #ifdef CONFIG_IPV6_ROUTER_PREF
216 .accept_ra_rtr_pref = 1,
217 .rtr_probe_interval = 60 * HZ,
218 #ifdef CONFIG_IPV6_ROUTE_INFO
219 .accept_ra_rt_info_min_plen = 0,
220 .accept_ra_rt_info_max_plen = 0,
221 #endif
222 #endif
223 .proxy_ndp = 0,
224 .accept_source_route = 0, /* we do not accept RH0 by default. */
225 .disable_ipv6 = 0,
226 .accept_dad = 0,
227 .suppress_frag_ndisc = 1,
228 .accept_ra_mtu = 1,
229 .stable_secret = {
230 .initialized = false,
231 },
232 .use_oif_addrs_only = 0,
233 .ignore_routes_with_linkdown = 0,
234 .keep_addr_on_down = 0,
235 .seg6_enabled = 0,
236 #ifdef CONFIG_IPV6_SEG6_HMAC
237 .seg6_require_hmac = 0,
238 #endif
239 .enhanced_dad = 1,
240 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
241 .disable_policy = 0,
242 };
243
244 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
245 .forwarding = 0,
246 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
247 .mtu6 = IPV6_MIN_MTU,
248 .accept_ra = 1,
249 .accept_redirects = 1,
250 .autoconf = 1,
251 .force_mld_version = 0,
252 .mldv1_unsolicited_report_interval = 10 * HZ,
253 .mldv2_unsolicited_report_interval = HZ,
254 .dad_transmits = 1,
255 .rtr_solicits = MAX_RTR_SOLICITATIONS,
256 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
257 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
258 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
259 .use_tempaddr = 0,
260 .temp_valid_lft = TEMP_VALID_LIFETIME,
261 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
262 .regen_max_retry = REGEN_MAX_RETRY,
263 .max_desync_factor = MAX_DESYNC_FACTOR,
264 .max_addresses = IPV6_MAX_ADDRESSES,
265 .accept_ra_defrtr = 1,
266 .accept_ra_from_local = 0,
267 .accept_ra_min_hop_limit= 1,
268 .accept_ra_pinfo = 1,
269 #ifdef CONFIG_IPV6_ROUTER_PREF
270 .accept_ra_rtr_pref = 1,
271 .rtr_probe_interval = 60 * HZ,
272 #ifdef CONFIG_IPV6_ROUTE_INFO
273 .accept_ra_rt_info_min_plen = 0,
274 .accept_ra_rt_info_max_plen = 0,
275 #endif
276 #endif
277 .proxy_ndp = 0,
278 .accept_source_route = 0, /* we do not accept RH0 by default. */
279 .disable_ipv6 = 0,
280 .accept_dad = 1,
281 .suppress_frag_ndisc = 1,
282 .accept_ra_mtu = 1,
283 .stable_secret = {
284 .initialized = false,
285 },
286 .use_oif_addrs_only = 0,
287 .ignore_routes_with_linkdown = 0,
288 .keep_addr_on_down = 0,
289 .seg6_enabled = 0,
290 #ifdef CONFIG_IPV6_SEG6_HMAC
291 .seg6_require_hmac = 0,
292 #endif
293 .enhanced_dad = 1,
294 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
295 .disable_policy = 0,
296 };
297
298 /* Check if link is ready: is it up and is a valid qdisc available */
299 static inline bool addrconf_link_ready(const struct net_device *dev)
300 {
301 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
302 }
303
304 static void addrconf_del_rs_timer(struct inet6_dev *idev)
305 {
306 if (del_timer(&idev->rs_timer))
307 __in6_dev_put(idev);
308 }
309
310 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
311 {
312 if (cancel_delayed_work(&ifp->dad_work))
313 __in6_ifa_put(ifp);
314 }
315
316 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
317 unsigned long when)
318 {
319 if (!timer_pending(&idev->rs_timer))
320 in6_dev_hold(idev);
321 mod_timer(&idev->rs_timer, jiffies + when);
322 }
323
324 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
325 unsigned long delay)
326 {
327 in6_ifa_hold(ifp);
328 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
329 in6_ifa_put(ifp);
330 }
331
332 static int snmp6_alloc_dev(struct inet6_dev *idev)
333 {
334 int i;
335
336 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
337 if (!idev->stats.ipv6)
338 goto err_ip;
339
340 for_each_possible_cpu(i) {
341 struct ipstats_mib *addrconf_stats;
342 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
343 u64_stats_init(&addrconf_stats->syncp);
344 }
345
346
347 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
348 GFP_KERNEL);
349 if (!idev->stats.icmpv6dev)
350 goto err_icmp;
351 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
352 GFP_KERNEL);
353 if (!idev->stats.icmpv6msgdev)
354 goto err_icmpmsg;
355
356 return 0;
357
358 err_icmpmsg:
359 kfree(idev->stats.icmpv6dev);
360 err_icmp:
361 free_percpu(idev->stats.ipv6);
362 err_ip:
363 return -ENOMEM;
364 }
365
366 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
367 {
368 struct inet6_dev *ndev;
369 int err = -ENOMEM;
370
371 ASSERT_RTNL();
372
373 if (dev->mtu < IPV6_MIN_MTU)
374 return ERR_PTR(-EINVAL);
375
376 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
377 if (!ndev)
378 return ERR_PTR(err);
379
380 rwlock_init(&ndev->lock);
381 ndev->dev = dev;
382 INIT_LIST_HEAD(&ndev->addr_list);
383 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
384 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
385
386 if (ndev->cnf.stable_secret.initialized)
387 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
388
389 ndev->cnf.mtu6 = dev->mtu;
390 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
391 if (!ndev->nd_parms) {
392 kfree(ndev);
393 return ERR_PTR(err);
394 }
395 if (ndev->cnf.forwarding)
396 dev_disable_lro(dev);
397 /* We refer to the device */
398 dev_hold(dev);
399
400 if (snmp6_alloc_dev(ndev) < 0) {
401 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
402 __func__);
403 neigh_parms_release(&nd_tbl, ndev->nd_parms);
404 dev_put(dev);
405 kfree(ndev);
406 return ERR_PTR(err);
407 }
408
409 if (snmp6_register_dev(ndev) < 0) {
410 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
411 __func__, dev->name);
412 goto err_release;
413 }
414
415 /* One reference from device. */
416 refcount_set(&ndev->refcnt, 1);
417
418 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
419 ndev->cnf.accept_dad = -1;
420
421 #if IS_ENABLED(CONFIG_IPV6_SIT)
422 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
423 pr_info("%s: Disabled Multicast RS\n", dev->name);
424 ndev->cnf.rtr_solicits = 0;
425 }
426 #endif
427
428 INIT_LIST_HEAD(&ndev->tempaddr_list);
429 ndev->desync_factor = U32_MAX;
430 if ((dev->flags&IFF_LOOPBACK) ||
431 dev->type == ARPHRD_TUNNEL ||
432 dev->type == ARPHRD_TUNNEL6 ||
433 dev->type == ARPHRD_SIT ||
434 dev->type == ARPHRD_NONE) {
435 ndev->cnf.use_tempaddr = -1;
436 } else
437 ipv6_regen_rndid(ndev);
438
439 ndev->token = in6addr_any;
440
441 if (netif_running(dev) && addrconf_link_ready(dev))
442 ndev->if_flags |= IF_READY;
443
444 ipv6_mc_init_dev(ndev);
445 ndev->tstamp = jiffies;
446 err = addrconf_sysctl_register(ndev);
447 if (err) {
448 ipv6_mc_destroy_dev(ndev);
449 snmp6_unregister_dev(ndev);
450 goto err_release;
451 }
452 /* protected by rtnl_lock */
453 rcu_assign_pointer(dev->ip6_ptr, ndev);
454
455 /* Join interface-local all-node multicast group */
456 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
457
458 /* Join all-node multicast group */
459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
460
461 /* Join all-router multicast group if forwarding is set */
462 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
463 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
464
465 return ndev;
466
467 err_release:
468 neigh_parms_release(&nd_tbl, ndev->nd_parms);
469 ndev->dead = 1;
470 in6_dev_finish_destroy(ndev);
471 return ERR_PTR(err);
472 }
473
474 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
475 {
476 struct inet6_dev *idev;
477
478 ASSERT_RTNL();
479
480 idev = __in6_dev_get(dev);
481 if (!idev) {
482 idev = ipv6_add_dev(dev);
483 if (IS_ERR(idev))
484 return NULL;
485 }
486
487 if (dev->flags&IFF_UP)
488 ipv6_mc_up(idev);
489 return idev;
490 }
491
492 static int inet6_netconf_msgsize_devconf(int type)
493 {
494 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
495 + nla_total_size(4); /* NETCONFA_IFINDEX */
496 bool all = false;
497
498 if (type == NETCONFA_ALL)
499 all = true;
500
501 if (all || type == NETCONFA_FORWARDING)
502 size += nla_total_size(4);
503 #ifdef CONFIG_IPV6_MROUTE
504 if (all || type == NETCONFA_MC_FORWARDING)
505 size += nla_total_size(4);
506 #endif
507 if (all || type == NETCONFA_PROXY_NEIGH)
508 size += nla_total_size(4);
509
510 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
511 size += nla_total_size(4);
512
513 return size;
514 }
515
516 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
517 struct ipv6_devconf *devconf, u32 portid,
518 u32 seq, int event, unsigned int flags,
519 int type)
520 {
521 struct nlmsghdr *nlh;
522 struct netconfmsg *ncm;
523 bool all = false;
524
525 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
526 flags);
527 if (!nlh)
528 return -EMSGSIZE;
529
530 if (type == NETCONFA_ALL)
531 all = true;
532
533 ncm = nlmsg_data(nlh);
534 ncm->ncm_family = AF_INET6;
535
536 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
537 goto nla_put_failure;
538
539 if (!devconf)
540 goto out;
541
542 if ((all || type == NETCONFA_FORWARDING) &&
543 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
544 goto nla_put_failure;
545 #ifdef CONFIG_IPV6_MROUTE
546 if ((all || type == NETCONFA_MC_FORWARDING) &&
547 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
548 devconf->mc_forwarding) < 0)
549 goto nla_put_failure;
550 #endif
551 if ((all || type == NETCONFA_PROXY_NEIGH) &&
552 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
553 goto nla_put_failure;
554
555 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
556 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
557 devconf->ignore_routes_with_linkdown) < 0)
558 goto nla_put_failure;
559
560 out:
561 nlmsg_end(skb, nlh);
562 return 0;
563
564 nla_put_failure:
565 nlmsg_cancel(skb, nlh);
566 return -EMSGSIZE;
567 }
568
569 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
570 int ifindex, struct ipv6_devconf *devconf)
571 {
572 struct sk_buff *skb;
573 int err = -ENOBUFS;
574
575 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
576 if (!skb)
577 goto errout;
578
579 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
580 event, 0, type);
581 if (err < 0) {
582 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
583 WARN_ON(err == -EMSGSIZE);
584 kfree_skb(skb);
585 goto errout;
586 }
587 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
588 return;
589 errout:
590 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
591 }
592
593 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
594 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
595 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
596 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
597 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
598 };
599
600 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
601 struct nlmsghdr *nlh,
602 struct netlink_ext_ack *extack)
603 {
604 struct net *net = sock_net(in_skb->sk);
605 struct nlattr *tb[NETCONFA_MAX+1];
606 struct inet6_dev *in6_dev = NULL;
607 struct net_device *dev = NULL;
608 struct netconfmsg *ncm;
609 struct sk_buff *skb;
610 struct ipv6_devconf *devconf;
611 int ifindex;
612 int err;
613
614 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
615 devconf_ipv6_policy, extack);
616 if (err < 0)
617 return err;
618
619 if (!tb[NETCONFA_IFINDEX])
620 return -EINVAL;
621
622 err = -EINVAL;
623 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
624 switch (ifindex) {
625 case NETCONFA_IFINDEX_ALL:
626 devconf = net->ipv6.devconf_all;
627 break;
628 case NETCONFA_IFINDEX_DEFAULT:
629 devconf = net->ipv6.devconf_dflt;
630 break;
631 default:
632 dev = dev_get_by_index(net, ifindex);
633 if (!dev)
634 return -EINVAL;
635 in6_dev = in6_dev_get(dev);
636 if (!in6_dev)
637 goto errout;
638 devconf = &in6_dev->cnf;
639 break;
640 }
641
642 err = -ENOBUFS;
643 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
644 if (!skb)
645 goto errout;
646
647 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
648 NETLINK_CB(in_skb).portid,
649 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
650 NETCONFA_ALL);
651 if (err < 0) {
652 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
653 WARN_ON(err == -EMSGSIZE);
654 kfree_skb(skb);
655 goto errout;
656 }
657 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
658 errout:
659 if (in6_dev)
660 in6_dev_put(in6_dev);
661 if (dev)
662 dev_put(dev);
663 return err;
664 }
665
666 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
667 struct netlink_callback *cb)
668 {
669 struct net *net = sock_net(skb->sk);
670 int h, s_h;
671 int idx, s_idx;
672 struct net_device *dev;
673 struct inet6_dev *idev;
674 struct hlist_head *head;
675
676 s_h = cb->args[0];
677 s_idx = idx = cb->args[1];
678
679 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
680 idx = 0;
681 head = &net->dev_index_head[h];
682 rcu_read_lock();
683 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
684 net->dev_base_seq;
685 hlist_for_each_entry_rcu(dev, head, index_hlist) {
686 if (idx < s_idx)
687 goto cont;
688 idev = __in6_dev_get(dev);
689 if (!idev)
690 goto cont;
691
692 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
693 &idev->cnf,
694 NETLINK_CB(cb->skb).portid,
695 cb->nlh->nlmsg_seq,
696 RTM_NEWNETCONF,
697 NLM_F_MULTI,
698 NETCONFA_ALL) < 0) {
699 rcu_read_unlock();
700 goto done;
701 }
702 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
703 cont:
704 idx++;
705 }
706 rcu_read_unlock();
707 }
708 if (h == NETDEV_HASHENTRIES) {
709 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
710 net->ipv6.devconf_all,
711 NETLINK_CB(cb->skb).portid,
712 cb->nlh->nlmsg_seq,
713 RTM_NEWNETCONF, NLM_F_MULTI,
714 NETCONFA_ALL) < 0)
715 goto done;
716 else
717 h++;
718 }
719 if (h == NETDEV_HASHENTRIES + 1) {
720 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
721 net->ipv6.devconf_dflt,
722 NETLINK_CB(cb->skb).portid,
723 cb->nlh->nlmsg_seq,
724 RTM_NEWNETCONF, NLM_F_MULTI,
725 NETCONFA_ALL) < 0)
726 goto done;
727 else
728 h++;
729 }
730 done:
731 cb->args[0] = h;
732 cb->args[1] = idx;
733
734 return skb->len;
735 }
736
737 #ifdef CONFIG_SYSCTL
738 static void dev_forward_change(struct inet6_dev *idev)
739 {
740 struct net_device *dev;
741 struct inet6_ifaddr *ifa;
742
743 if (!idev)
744 return;
745 dev = idev->dev;
746 if (idev->cnf.forwarding)
747 dev_disable_lro(dev);
748 if (dev->flags & IFF_MULTICAST) {
749 if (idev->cnf.forwarding) {
750 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
751 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
752 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
753 } else {
754 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
755 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
756 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
757 }
758 }
759
760 list_for_each_entry(ifa, &idev->addr_list, if_list) {
761 if (ifa->flags&IFA_F_TENTATIVE)
762 continue;
763 if (idev->cnf.forwarding)
764 addrconf_join_anycast(ifa);
765 else
766 addrconf_leave_anycast(ifa);
767 }
768 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
769 NETCONFA_FORWARDING,
770 dev->ifindex, &idev->cnf);
771 }
772
773
774 static void addrconf_forward_change(struct net *net, __s32 newf)
775 {
776 struct net_device *dev;
777 struct inet6_dev *idev;
778
779 for_each_netdev(net, dev) {
780 idev = __in6_dev_get(dev);
781 if (idev) {
782 int changed = (!idev->cnf.forwarding) ^ (!newf);
783 idev->cnf.forwarding = newf;
784 if (changed)
785 dev_forward_change(idev);
786 }
787 }
788 }
789
790 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
791 {
792 struct net *net;
793 int old;
794
795 if (!rtnl_trylock())
796 return restart_syscall();
797
798 net = (struct net *)table->extra2;
799 old = *p;
800 *p = newf;
801
802 if (p == &net->ipv6.devconf_dflt->forwarding) {
803 if ((!newf) ^ (!old))
804 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
805 NETCONFA_FORWARDING,
806 NETCONFA_IFINDEX_DEFAULT,
807 net->ipv6.devconf_dflt);
808 rtnl_unlock();
809 return 0;
810 }
811
812 if (p == &net->ipv6.devconf_all->forwarding) {
813 int old_dflt = net->ipv6.devconf_dflt->forwarding;
814
815 net->ipv6.devconf_dflt->forwarding = newf;
816 if ((!newf) ^ (!old_dflt))
817 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
818 NETCONFA_FORWARDING,
819 NETCONFA_IFINDEX_DEFAULT,
820 net->ipv6.devconf_dflt);
821
822 addrconf_forward_change(net, newf);
823 if ((!newf) ^ (!old))
824 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
825 NETCONFA_FORWARDING,
826 NETCONFA_IFINDEX_ALL,
827 net->ipv6.devconf_all);
828 } else if ((!newf) ^ (!old))
829 dev_forward_change((struct inet6_dev *)table->extra1);
830 rtnl_unlock();
831
832 if (newf)
833 rt6_purge_dflt_routers(net);
834 return 1;
835 }
836
837 static void addrconf_linkdown_change(struct net *net, __s32 newf)
838 {
839 struct net_device *dev;
840 struct inet6_dev *idev;
841
842 for_each_netdev(net, dev) {
843 idev = __in6_dev_get(dev);
844 if (idev) {
845 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
846
847 idev->cnf.ignore_routes_with_linkdown = newf;
848 if (changed)
849 inet6_netconf_notify_devconf(dev_net(dev),
850 RTM_NEWNETCONF,
851 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
852 dev->ifindex,
853 &idev->cnf);
854 }
855 }
856 }
857
858 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
859 {
860 struct net *net;
861 int old;
862
863 if (!rtnl_trylock())
864 return restart_syscall();
865
866 net = (struct net *)table->extra2;
867 old = *p;
868 *p = newf;
869
870 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
871 if ((!newf) ^ (!old))
872 inet6_netconf_notify_devconf(net,
873 RTM_NEWNETCONF,
874 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
875 NETCONFA_IFINDEX_DEFAULT,
876 net->ipv6.devconf_dflt);
877 rtnl_unlock();
878 return 0;
879 }
880
881 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
882 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
883 addrconf_linkdown_change(net, newf);
884 if ((!newf) ^ (!old))
885 inet6_netconf_notify_devconf(net,
886 RTM_NEWNETCONF,
887 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
888 NETCONFA_IFINDEX_ALL,
889 net->ipv6.devconf_all);
890 }
891 rtnl_unlock();
892
893 return 1;
894 }
895
896 #endif
897
898 /* Nobody refers to this ifaddr, destroy it */
899 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
900 {
901 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
902
903 #ifdef NET_REFCNT_DEBUG
904 pr_debug("%s\n", __func__);
905 #endif
906
907 in6_dev_put(ifp->idev);
908
909 if (cancel_delayed_work(&ifp->dad_work))
910 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
911 ifp);
912
913 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
914 pr_warn("Freeing alive inet6 address %p\n", ifp);
915 return;
916 }
917
918 kfree_rcu(ifp, rcu);
919 }
920
921 static void
922 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
923 {
924 struct list_head *p;
925 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
926
927 /*
928 * Each device address list is sorted in order of scope -
929 * global before linklocal.
930 */
931 list_for_each(p, &idev->addr_list) {
932 struct inet6_ifaddr *ifa
933 = list_entry(p, struct inet6_ifaddr, if_list);
934 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
935 break;
936 }
937
938 list_add_tail_rcu(&ifp->if_list, p);
939 }
940
941 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
942 {
943 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
944
945 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
946 }
947
948 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
949 struct net_device *dev, unsigned int hash)
950 {
951 struct inet6_ifaddr *ifp;
952
953 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
954 if (!net_eq(dev_net(ifp->idev->dev), net))
955 continue;
956 if (ipv6_addr_equal(&ifp->addr, addr)) {
957 if (!dev || ifp->idev->dev == dev)
958 return true;
959 }
960 }
961 return false;
962 }
963
964 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
965 {
966 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
967 int err = 0;
968
969 spin_lock(&addrconf_hash_lock);
970
971 /* Ignore adding duplicate addresses on an interface */
972 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
973 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
974 err = -EEXIST;
975 } else {
976 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
977 }
978
979 spin_unlock(&addrconf_hash_lock);
980
981 return err;
982 }
983
984 /* On success it returns ifp with increased reference count */
985
986 static struct inet6_ifaddr *
987 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
988 bool can_block, struct netlink_ext_ack *extack)
989 {
990 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
991 int addr_type = ipv6_addr_type(cfg->pfx);
992 struct net *net = dev_net(idev->dev);
993 struct inet6_ifaddr *ifa = NULL;
994 struct fib6_info *f6i = NULL;
995 int err = 0;
996
997 if (addr_type == IPV6_ADDR_ANY ||
998 addr_type & IPV6_ADDR_MULTICAST ||
999 (!(idev->dev->flags & IFF_LOOPBACK) &&
1000 addr_type & IPV6_ADDR_LOOPBACK))
1001 return ERR_PTR(-EADDRNOTAVAIL);
1002
1003 if (idev->dead) {
1004 err = -ENODEV; /*XXX*/
1005 goto out;
1006 }
1007
1008 if (idev->cnf.disable_ipv6) {
1009 err = -EACCES;
1010 goto out;
1011 }
1012
1013 /* validator notifier needs to be blocking;
1014 * do not call in atomic context
1015 */
1016 if (can_block) {
1017 struct in6_validator_info i6vi = {
1018 .i6vi_addr = *cfg->pfx,
1019 .i6vi_dev = idev,
1020 .extack = extack,
1021 };
1022
1023 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1024 err = notifier_to_errno(err);
1025 if (err < 0)
1026 goto out;
1027 }
1028
1029 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1030 if (!ifa) {
1031 err = -ENOBUFS;
1032 goto out;
1033 }
1034
1035 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1036 if (IS_ERR(f6i)) {
1037 err = PTR_ERR(f6i);
1038 f6i = NULL;
1039 goto out;
1040 }
1041
1042 if (net->ipv6.devconf_all->disable_policy ||
1043 idev->cnf.disable_policy)
1044 f6i->dst_nopolicy = true;
1045
1046 neigh_parms_data_state_setall(idev->nd_parms);
1047
1048 ifa->addr = *cfg->pfx;
1049 if (cfg->peer_pfx)
1050 ifa->peer_addr = *cfg->peer_pfx;
1051
1052 spin_lock_init(&ifa->lock);
1053 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1054 INIT_HLIST_NODE(&ifa->addr_lst);
1055 ifa->scope = cfg->scope;
1056 ifa->prefix_len = cfg->plen;
1057 ifa->rt_priority = cfg->rt_priority;
1058 ifa->flags = cfg->ifa_flags;
1059 /* No need to add the TENTATIVE flag for addresses with NODAD */
1060 if (!(cfg->ifa_flags & IFA_F_NODAD))
1061 ifa->flags |= IFA_F_TENTATIVE;
1062 ifa->valid_lft = cfg->valid_lft;
1063 ifa->prefered_lft = cfg->preferred_lft;
1064 ifa->cstamp = ifa->tstamp = jiffies;
1065 ifa->tokenized = false;
1066
1067 ifa->rt = f6i;
1068
1069 ifa->idev = idev;
1070 in6_dev_hold(idev);
1071
1072 /* For caller */
1073 refcount_set(&ifa->refcnt, 1);
1074
1075 rcu_read_lock_bh();
1076
1077 err = ipv6_add_addr_hash(idev->dev, ifa);
1078 if (err < 0) {
1079 rcu_read_unlock_bh();
1080 goto out;
1081 }
1082
1083 write_lock(&idev->lock);
1084
1085 /* Add to inet6_dev unicast addr list. */
1086 ipv6_link_dev_addr(idev, ifa);
1087
1088 if (ifa->flags&IFA_F_TEMPORARY) {
1089 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1090 in6_ifa_hold(ifa);
1091 }
1092
1093 in6_ifa_hold(ifa);
1094 write_unlock(&idev->lock);
1095
1096 rcu_read_unlock_bh();
1097
1098 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1099 out:
1100 if (unlikely(err < 0)) {
1101 fib6_info_release(f6i);
1102
1103 if (ifa) {
1104 if (ifa->idev)
1105 in6_dev_put(ifa->idev);
1106 kfree(ifa);
1107 }
1108 ifa = ERR_PTR(err);
1109 }
1110
1111 return ifa;
1112 }
1113
1114 enum cleanup_prefix_rt_t {
1115 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1116 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1117 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1118 };
1119
1120 /*
1121 * Check, whether the prefix for ifp would still need a prefix route
1122 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1123 * constants.
1124 *
1125 * 1) we don't purge prefix if address was not permanent.
1126 * prefix is managed by its own lifetime.
1127 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1128 * 3) if there are no addresses, delete prefix.
1129 * 4) if there are still other permanent address(es),
1130 * corresponding prefix is still permanent.
1131 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1132 * don't purge the prefix, assume user space is managing it.
1133 * 6) otherwise, update prefix lifetime to the
1134 * longest valid lifetime among the corresponding
1135 * addresses on the device.
1136 * Note: subsequent RA will update lifetime.
1137 **/
1138 static enum cleanup_prefix_rt_t
1139 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1140 {
1141 struct inet6_ifaddr *ifa;
1142 struct inet6_dev *idev = ifp->idev;
1143 unsigned long lifetime;
1144 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1145
1146 *expires = jiffies;
1147
1148 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1149 if (ifa == ifp)
1150 continue;
1151 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1152 ifp->prefix_len))
1153 continue;
1154 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1155 return CLEANUP_PREFIX_RT_NOP;
1156
1157 action = CLEANUP_PREFIX_RT_EXPIRE;
1158
1159 spin_lock(&ifa->lock);
1160
1161 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1162 /*
1163 * Note: Because this address is
1164 * not permanent, lifetime <
1165 * LONG_MAX / HZ here.
1166 */
1167 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1168 *expires = ifa->tstamp + lifetime * HZ;
1169 spin_unlock(&ifa->lock);
1170 }
1171
1172 return action;
1173 }
1174
1175 static void
1176 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1177 {
1178 struct fib6_info *f6i;
1179
1180 f6i = addrconf_get_prefix_route(&ifp->addr,
1181 ifp->prefix_len,
1182 ifp->idev->dev,
1183 0, RTF_GATEWAY | RTF_DEFAULT);
1184 if (f6i) {
1185 if (del_rt)
1186 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
1187 else {
1188 if (!(f6i->fib6_flags & RTF_EXPIRES))
1189 fib6_set_expires(f6i, expires);
1190 fib6_info_release(f6i);
1191 }
1192 }
1193 }
1194
1195
1196 /* This function wants to get referenced ifp and releases it before return */
1197
1198 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1199 {
1200 int state;
1201 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1202 unsigned long expires;
1203
1204 ASSERT_RTNL();
1205
1206 spin_lock_bh(&ifp->lock);
1207 state = ifp->state;
1208 ifp->state = INET6_IFADDR_STATE_DEAD;
1209 spin_unlock_bh(&ifp->lock);
1210
1211 if (state == INET6_IFADDR_STATE_DEAD)
1212 goto out;
1213
1214 spin_lock_bh(&addrconf_hash_lock);
1215 hlist_del_init_rcu(&ifp->addr_lst);
1216 spin_unlock_bh(&addrconf_hash_lock);
1217
1218 write_lock_bh(&ifp->idev->lock);
1219
1220 if (ifp->flags&IFA_F_TEMPORARY) {
1221 list_del(&ifp->tmp_list);
1222 if (ifp->ifpub) {
1223 in6_ifa_put(ifp->ifpub);
1224 ifp->ifpub = NULL;
1225 }
1226 __in6_ifa_put(ifp);
1227 }
1228
1229 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1230 action = check_cleanup_prefix_route(ifp, &expires);
1231
1232 list_del_rcu(&ifp->if_list);
1233 __in6_ifa_put(ifp);
1234
1235 write_unlock_bh(&ifp->idev->lock);
1236
1237 addrconf_del_dad_work(ifp);
1238
1239 ipv6_ifa_notify(RTM_DELADDR, ifp);
1240
1241 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1242
1243 if (action != CLEANUP_PREFIX_RT_NOP) {
1244 cleanup_prefix_route(ifp, expires,
1245 action == CLEANUP_PREFIX_RT_DEL);
1246 }
1247
1248 /* clean up prefsrc entries */
1249 rt6_remove_prefsrc(ifp);
1250 out:
1251 in6_ifa_put(ifp);
1252 }
1253
1254 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1255 struct inet6_ifaddr *ift,
1256 bool block)
1257 {
1258 struct inet6_dev *idev = ifp->idev;
1259 struct in6_addr addr, *tmpaddr;
1260 unsigned long tmp_tstamp, age;
1261 unsigned long regen_advance;
1262 struct ifa6_config cfg;
1263 int ret = 0;
1264 unsigned long now = jiffies;
1265 long max_desync_factor;
1266 s32 cnf_temp_preferred_lft;
1267
1268 write_lock_bh(&idev->lock);
1269 if (ift) {
1270 spin_lock_bh(&ift->lock);
1271 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1272 spin_unlock_bh(&ift->lock);
1273 tmpaddr = &addr;
1274 } else {
1275 tmpaddr = NULL;
1276 }
1277 retry:
1278 in6_dev_hold(idev);
1279 if (idev->cnf.use_tempaddr <= 0) {
1280 write_unlock_bh(&idev->lock);
1281 pr_info("%s: use_tempaddr is disabled\n", __func__);
1282 in6_dev_put(idev);
1283 ret = -1;
1284 goto out;
1285 }
1286 spin_lock_bh(&ifp->lock);
1287 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1288 idev->cnf.use_tempaddr = -1; /*XXX*/
1289 spin_unlock_bh(&ifp->lock);
1290 write_unlock_bh(&idev->lock);
1291 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1292 __func__);
1293 in6_dev_put(idev);
1294 ret = -1;
1295 goto out;
1296 }
1297 in6_ifa_hold(ifp);
1298 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1299 ipv6_try_regen_rndid(idev, tmpaddr);
1300 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1301 age = (now - ifp->tstamp) / HZ;
1302
1303 regen_advance = idev->cnf.regen_max_retry *
1304 idev->cnf.dad_transmits *
1305 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1306
1307 /* recalculate max_desync_factor each time and update
1308 * idev->desync_factor if it's larger
1309 */
1310 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1311 max_desync_factor = min_t(__u32,
1312 idev->cnf.max_desync_factor,
1313 cnf_temp_preferred_lft - regen_advance);
1314
1315 if (unlikely(idev->desync_factor > max_desync_factor)) {
1316 if (max_desync_factor > 0) {
1317 get_random_bytes(&idev->desync_factor,
1318 sizeof(idev->desync_factor));
1319 idev->desync_factor %= max_desync_factor;
1320 } else {
1321 idev->desync_factor = 0;
1322 }
1323 }
1324
1325 memset(&cfg, 0, sizeof(cfg));
1326 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1327 idev->cnf.temp_valid_lft + age);
1328 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1329 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1330
1331 cfg.plen = ifp->prefix_len;
1332 tmp_tstamp = ifp->tstamp;
1333 spin_unlock_bh(&ifp->lock);
1334
1335 write_unlock_bh(&idev->lock);
1336
1337 /* A temporary address is created only if this calculated Preferred
1338 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1339 * an implementation must not create a temporary address with a zero
1340 * Preferred Lifetime.
1341 * Use age calculation as in addrconf_verify to avoid unnecessary
1342 * temporary addresses being generated.
1343 */
1344 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1345 if (cfg.preferred_lft <= regen_advance + age) {
1346 in6_ifa_put(ifp);
1347 in6_dev_put(idev);
1348 ret = -1;
1349 goto out;
1350 }
1351
1352 cfg.ifa_flags = IFA_F_TEMPORARY;
1353 /* set in addrconf_prefix_rcv() */
1354 if (ifp->flags & IFA_F_OPTIMISTIC)
1355 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1356
1357 cfg.pfx = &addr;
1358 cfg.scope = ipv6_addr_scope(cfg.pfx);
1359
1360 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1361 if (IS_ERR(ift)) {
1362 in6_ifa_put(ifp);
1363 in6_dev_put(idev);
1364 pr_info("%s: retry temporary address regeneration\n", __func__);
1365 tmpaddr = &addr;
1366 write_lock_bh(&idev->lock);
1367 goto retry;
1368 }
1369
1370 spin_lock_bh(&ift->lock);
1371 ift->ifpub = ifp;
1372 ift->cstamp = now;
1373 ift->tstamp = tmp_tstamp;
1374 spin_unlock_bh(&ift->lock);
1375
1376 addrconf_dad_start(ift);
1377 in6_ifa_put(ift);
1378 in6_dev_put(idev);
1379 out:
1380 return ret;
1381 }
1382
1383 /*
1384 * Choose an appropriate source address (RFC3484)
1385 */
1386 enum {
1387 IPV6_SADDR_RULE_INIT = 0,
1388 IPV6_SADDR_RULE_LOCAL,
1389 IPV6_SADDR_RULE_SCOPE,
1390 IPV6_SADDR_RULE_PREFERRED,
1391 #ifdef CONFIG_IPV6_MIP6
1392 IPV6_SADDR_RULE_HOA,
1393 #endif
1394 IPV6_SADDR_RULE_OIF,
1395 IPV6_SADDR_RULE_LABEL,
1396 IPV6_SADDR_RULE_PRIVACY,
1397 IPV6_SADDR_RULE_ORCHID,
1398 IPV6_SADDR_RULE_PREFIX,
1399 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1400 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1401 #endif
1402 IPV6_SADDR_RULE_MAX
1403 };
1404
1405 struct ipv6_saddr_score {
1406 int rule;
1407 int addr_type;
1408 struct inet6_ifaddr *ifa;
1409 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1410 int scopedist;
1411 int matchlen;
1412 };
1413
1414 struct ipv6_saddr_dst {
1415 const struct in6_addr *addr;
1416 int ifindex;
1417 int scope;
1418 int label;
1419 unsigned int prefs;
1420 };
1421
1422 static inline int ipv6_saddr_preferred(int type)
1423 {
1424 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1425 return 1;
1426 return 0;
1427 }
1428
1429 static bool ipv6_use_optimistic_addr(struct net *net,
1430 struct inet6_dev *idev)
1431 {
1432 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1433 if (!idev)
1434 return false;
1435 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1436 return false;
1437 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1438 return false;
1439
1440 return true;
1441 #else
1442 return false;
1443 #endif
1444 }
1445
1446 static bool ipv6_allow_optimistic_dad(struct net *net,
1447 struct inet6_dev *idev)
1448 {
1449 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1450 if (!idev)
1451 return false;
1452 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1453 return false;
1454
1455 return true;
1456 #else
1457 return false;
1458 #endif
1459 }
1460
1461 static int ipv6_get_saddr_eval(struct net *net,
1462 struct ipv6_saddr_score *score,
1463 struct ipv6_saddr_dst *dst,
1464 int i)
1465 {
1466 int ret;
1467
1468 if (i <= score->rule) {
1469 switch (i) {
1470 case IPV6_SADDR_RULE_SCOPE:
1471 ret = score->scopedist;
1472 break;
1473 case IPV6_SADDR_RULE_PREFIX:
1474 ret = score->matchlen;
1475 break;
1476 default:
1477 ret = !!test_bit(i, score->scorebits);
1478 }
1479 goto out;
1480 }
1481
1482 switch (i) {
1483 case IPV6_SADDR_RULE_INIT:
1484 /* Rule 0: remember if hiscore is not ready yet */
1485 ret = !!score->ifa;
1486 break;
1487 case IPV6_SADDR_RULE_LOCAL:
1488 /* Rule 1: Prefer same address */
1489 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1490 break;
1491 case IPV6_SADDR_RULE_SCOPE:
1492 /* Rule 2: Prefer appropriate scope
1493 *
1494 * ret
1495 * ^
1496 * -1 | d 15
1497 * ---+--+-+---> scope
1498 * |
1499 * | d is scope of the destination.
1500 * B-d | \
1501 * | \ <- smaller scope is better if
1502 * B-15 | \ if scope is enough for destination.
1503 * | ret = B - scope (-1 <= scope >= d <= 15).
1504 * d-C-1 | /
1505 * |/ <- greater is better
1506 * -C / if scope is not enough for destination.
1507 * /| ret = scope - C (-1 <= d < scope <= 15).
1508 *
1509 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1510 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1511 * Assume B = 0 and we get C > 29.
1512 */
1513 ret = __ipv6_addr_src_scope(score->addr_type);
1514 if (ret >= dst->scope)
1515 ret = -ret;
1516 else
1517 ret -= 128; /* 30 is enough */
1518 score->scopedist = ret;
1519 break;
1520 case IPV6_SADDR_RULE_PREFERRED:
1521 {
1522 /* Rule 3: Avoid deprecated and optimistic addresses */
1523 u8 avoid = IFA_F_DEPRECATED;
1524
1525 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1526 avoid |= IFA_F_OPTIMISTIC;
1527 ret = ipv6_saddr_preferred(score->addr_type) ||
1528 !(score->ifa->flags & avoid);
1529 break;
1530 }
1531 #ifdef CONFIG_IPV6_MIP6
1532 case IPV6_SADDR_RULE_HOA:
1533 {
1534 /* Rule 4: Prefer home address */
1535 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1536 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1537 break;
1538 }
1539 #endif
1540 case IPV6_SADDR_RULE_OIF:
1541 /* Rule 5: Prefer outgoing interface */
1542 ret = (!dst->ifindex ||
1543 dst->ifindex == score->ifa->idev->dev->ifindex);
1544 break;
1545 case IPV6_SADDR_RULE_LABEL:
1546 /* Rule 6: Prefer matching label */
1547 ret = ipv6_addr_label(net,
1548 &score->ifa->addr, score->addr_type,
1549 score->ifa->idev->dev->ifindex) == dst->label;
1550 break;
1551 case IPV6_SADDR_RULE_PRIVACY:
1552 {
1553 /* Rule 7: Prefer public address
1554 * Note: prefer temporary address if use_tempaddr >= 2
1555 */
1556 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1557 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1558 score->ifa->idev->cnf.use_tempaddr >= 2;
1559 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1560 break;
1561 }
1562 case IPV6_SADDR_RULE_ORCHID:
1563 /* Rule 8-: Prefer ORCHID vs ORCHID or
1564 * non-ORCHID vs non-ORCHID
1565 */
1566 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1567 ipv6_addr_orchid(dst->addr));
1568 break;
1569 case IPV6_SADDR_RULE_PREFIX:
1570 /* Rule 8: Use longest matching prefix */
1571 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1572 if (ret > score->ifa->prefix_len)
1573 ret = score->ifa->prefix_len;
1574 score->matchlen = ret;
1575 break;
1576 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1577 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1578 /* Optimistic addresses still have lower precedence than other
1579 * preferred addresses.
1580 */
1581 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1582 break;
1583 #endif
1584 default:
1585 ret = 0;
1586 }
1587
1588 if (ret)
1589 __set_bit(i, score->scorebits);
1590 score->rule = i;
1591 out:
1592 return ret;
1593 }
1594
1595 static int __ipv6_dev_get_saddr(struct net *net,
1596 struct ipv6_saddr_dst *dst,
1597 struct inet6_dev *idev,
1598 struct ipv6_saddr_score *scores,
1599 int hiscore_idx)
1600 {
1601 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1602
1603 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1604 int i;
1605
1606 /*
1607 * - Tentative Address (RFC2462 section 5.4)
1608 * - A tentative address is not considered
1609 * "assigned to an interface" in the traditional
1610 * sense, unless it is also flagged as optimistic.
1611 * - Candidate Source Address (section 4)
1612 * - In any case, anycast addresses, multicast
1613 * addresses, and the unspecified address MUST
1614 * NOT be included in a candidate set.
1615 */
1616 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1617 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1618 continue;
1619
1620 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1621
1622 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1623 score->addr_type & IPV6_ADDR_MULTICAST)) {
1624 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1625 idev->dev->name);
1626 continue;
1627 }
1628
1629 score->rule = -1;
1630 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1631
1632 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1633 int minihiscore, miniscore;
1634
1635 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1636 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1637
1638 if (minihiscore > miniscore) {
1639 if (i == IPV6_SADDR_RULE_SCOPE &&
1640 score->scopedist > 0) {
1641 /*
1642 * special case:
1643 * each remaining entry
1644 * has too small (not enough)
1645 * scope, because ifa entries
1646 * are sorted by their scope
1647 * values.
1648 */
1649 goto out;
1650 }
1651 break;
1652 } else if (minihiscore < miniscore) {
1653 swap(hiscore, score);
1654 hiscore_idx = 1 - hiscore_idx;
1655
1656 /* restore our iterator */
1657 score->ifa = hiscore->ifa;
1658
1659 break;
1660 }
1661 }
1662 }
1663 out:
1664 return hiscore_idx;
1665 }
1666
1667 static int ipv6_get_saddr_master(struct net *net,
1668 const struct net_device *dst_dev,
1669 const struct net_device *master,
1670 struct ipv6_saddr_dst *dst,
1671 struct ipv6_saddr_score *scores,
1672 int hiscore_idx)
1673 {
1674 struct inet6_dev *idev;
1675
1676 idev = __in6_dev_get(dst_dev);
1677 if (idev)
1678 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1679 scores, hiscore_idx);
1680
1681 idev = __in6_dev_get(master);
1682 if (idev)
1683 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1684 scores, hiscore_idx);
1685
1686 return hiscore_idx;
1687 }
1688
1689 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1690 const struct in6_addr *daddr, unsigned int prefs,
1691 struct in6_addr *saddr)
1692 {
1693 struct ipv6_saddr_score scores[2], *hiscore;
1694 struct ipv6_saddr_dst dst;
1695 struct inet6_dev *idev;
1696 struct net_device *dev;
1697 int dst_type;
1698 bool use_oif_addr = false;
1699 int hiscore_idx = 0;
1700 int ret = 0;
1701
1702 dst_type = __ipv6_addr_type(daddr);
1703 dst.addr = daddr;
1704 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1705 dst.scope = __ipv6_addr_src_scope(dst_type);
1706 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1707 dst.prefs = prefs;
1708
1709 scores[hiscore_idx].rule = -1;
1710 scores[hiscore_idx].ifa = NULL;
1711
1712 rcu_read_lock();
1713
1714 /* Candidate Source Address (section 4)
1715 * - multicast and link-local destination address,
1716 * the set of candidate source address MUST only
1717 * include addresses assigned to interfaces
1718 * belonging to the same link as the outgoing
1719 * interface.
1720 * (- For site-local destination addresses, the
1721 * set of candidate source addresses MUST only
1722 * include addresses assigned to interfaces
1723 * belonging to the same site as the outgoing
1724 * interface.)
1725 * - "It is RECOMMENDED that the candidate source addresses
1726 * be the set of unicast addresses assigned to the
1727 * interface that will be used to send to the destination
1728 * (the 'outgoing' interface)." (RFC 6724)
1729 */
1730 if (dst_dev) {
1731 idev = __in6_dev_get(dst_dev);
1732 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1733 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1734 (idev && idev->cnf.use_oif_addrs_only)) {
1735 use_oif_addr = true;
1736 }
1737 }
1738
1739 if (use_oif_addr) {
1740 if (idev)
1741 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1742 } else {
1743 const struct net_device *master;
1744 int master_idx = 0;
1745
1746 /* if dst_dev exists and is enslaved to an L3 device, then
1747 * prefer addresses from dst_dev and then the master over
1748 * any other enslaved devices in the L3 domain.
1749 */
1750 master = l3mdev_master_dev_rcu(dst_dev);
1751 if (master) {
1752 master_idx = master->ifindex;
1753
1754 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1755 master, &dst,
1756 scores, hiscore_idx);
1757
1758 if (scores[hiscore_idx].ifa)
1759 goto out;
1760 }
1761
1762 for_each_netdev_rcu(net, dev) {
1763 /* only consider addresses on devices in the
1764 * same L3 domain
1765 */
1766 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1767 continue;
1768 idev = __in6_dev_get(dev);
1769 if (!idev)
1770 continue;
1771 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1772 }
1773 }
1774
1775 out:
1776 hiscore = &scores[hiscore_idx];
1777 if (!hiscore->ifa)
1778 ret = -EADDRNOTAVAIL;
1779 else
1780 *saddr = hiscore->ifa->addr;
1781
1782 rcu_read_unlock();
1783 return ret;
1784 }
1785 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1786
1787 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1788 u32 banned_flags)
1789 {
1790 struct inet6_ifaddr *ifp;
1791 int err = -EADDRNOTAVAIL;
1792
1793 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1794 if (ifp->scope > IFA_LINK)
1795 break;
1796 if (ifp->scope == IFA_LINK &&
1797 !(ifp->flags & banned_flags)) {
1798 *addr = ifp->addr;
1799 err = 0;
1800 break;
1801 }
1802 }
1803 return err;
1804 }
1805
1806 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1807 u32 banned_flags)
1808 {
1809 struct inet6_dev *idev;
1810 int err = -EADDRNOTAVAIL;
1811
1812 rcu_read_lock();
1813 idev = __in6_dev_get(dev);
1814 if (idev) {
1815 read_lock_bh(&idev->lock);
1816 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1817 read_unlock_bh(&idev->lock);
1818 }
1819 rcu_read_unlock();
1820 return err;
1821 }
1822
1823 static int ipv6_count_addresses(const struct inet6_dev *idev)
1824 {
1825 const struct inet6_ifaddr *ifp;
1826 int cnt = 0;
1827
1828 rcu_read_lock();
1829 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1830 cnt++;
1831 rcu_read_unlock();
1832 return cnt;
1833 }
1834
1835 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1836 const struct net_device *dev, int strict)
1837 {
1838 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1839 strict, IFA_F_TENTATIVE);
1840 }
1841 EXPORT_SYMBOL(ipv6_chk_addr);
1842
1843 /* device argument is used to find the L3 domain of interest. If
1844 * skip_dev_check is set, then the ifp device is not checked against
1845 * the passed in dev argument. So the 2 cases for addresses checks are:
1846 * 1. does the address exist in the L3 domain that dev is part of
1847 * (skip_dev_check = true), or
1848 *
1849 * 2. does the address exist on the specific device
1850 * (skip_dev_check = false)
1851 */
1852 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1853 const struct net_device *dev, bool skip_dev_check,
1854 int strict, u32 banned_flags)
1855 {
1856 unsigned int hash = inet6_addr_hash(net, addr);
1857 const struct net_device *l3mdev;
1858 struct inet6_ifaddr *ifp;
1859 u32 ifp_flags;
1860
1861 rcu_read_lock();
1862
1863 l3mdev = l3mdev_master_dev_rcu(dev);
1864 if (skip_dev_check)
1865 dev = NULL;
1866
1867 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1868 if (!net_eq(dev_net(ifp->idev->dev), net))
1869 continue;
1870
1871 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1872 continue;
1873
1874 /* Decouple optimistic from tentative for evaluation here.
1875 * Ban optimistic addresses explicitly, when required.
1876 */
1877 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1878 ? (ifp->flags&~IFA_F_TENTATIVE)
1879 : ifp->flags;
1880 if (ipv6_addr_equal(&ifp->addr, addr) &&
1881 !(ifp_flags&banned_flags) &&
1882 (!dev || ifp->idev->dev == dev ||
1883 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1884 rcu_read_unlock();
1885 return 1;
1886 }
1887 }
1888
1889 rcu_read_unlock();
1890 return 0;
1891 }
1892 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1893
1894
1895 /* Compares an address/prefix_len with addresses on device @dev.
1896 * If one is found it returns true.
1897 */
1898 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1899 const unsigned int prefix_len, struct net_device *dev)
1900 {
1901 const struct inet6_ifaddr *ifa;
1902 const struct inet6_dev *idev;
1903 bool ret = false;
1904
1905 rcu_read_lock();
1906 idev = __in6_dev_get(dev);
1907 if (idev) {
1908 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1909 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1910 if (ret)
1911 break;
1912 }
1913 }
1914 rcu_read_unlock();
1915
1916 return ret;
1917 }
1918 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1919
1920 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1921 {
1922 const struct inet6_ifaddr *ifa;
1923 const struct inet6_dev *idev;
1924 int onlink;
1925
1926 onlink = 0;
1927 rcu_read_lock();
1928 idev = __in6_dev_get(dev);
1929 if (idev) {
1930 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1931 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1932 ifa->prefix_len);
1933 if (onlink)
1934 break;
1935 }
1936 }
1937 rcu_read_unlock();
1938 return onlink;
1939 }
1940 EXPORT_SYMBOL(ipv6_chk_prefix);
1941
1942 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1943 struct net_device *dev, int strict)
1944 {
1945 unsigned int hash = inet6_addr_hash(net, addr);
1946 struct inet6_ifaddr *ifp, *result = NULL;
1947
1948 rcu_read_lock();
1949 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1950 if (!net_eq(dev_net(ifp->idev->dev), net))
1951 continue;
1952 if (ipv6_addr_equal(&ifp->addr, addr)) {
1953 if (!dev || ifp->idev->dev == dev ||
1954 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1955 result = ifp;
1956 in6_ifa_hold(ifp);
1957 break;
1958 }
1959 }
1960 }
1961 rcu_read_unlock();
1962
1963 return result;
1964 }
1965
1966 /* Gets referenced address, destroys ifaddr */
1967
1968 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1969 {
1970 if (dad_failed)
1971 ifp->flags |= IFA_F_DADFAILED;
1972
1973 if (ifp->flags&IFA_F_TEMPORARY) {
1974 struct inet6_ifaddr *ifpub;
1975 spin_lock_bh(&ifp->lock);
1976 ifpub = ifp->ifpub;
1977 if (ifpub) {
1978 in6_ifa_hold(ifpub);
1979 spin_unlock_bh(&ifp->lock);
1980 ipv6_create_tempaddr(ifpub, ifp, true);
1981 in6_ifa_put(ifpub);
1982 } else {
1983 spin_unlock_bh(&ifp->lock);
1984 }
1985 ipv6_del_addr(ifp);
1986 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1987 spin_lock_bh(&ifp->lock);
1988 addrconf_del_dad_work(ifp);
1989 ifp->flags |= IFA_F_TENTATIVE;
1990 if (dad_failed)
1991 ifp->flags &= ~IFA_F_OPTIMISTIC;
1992 spin_unlock_bh(&ifp->lock);
1993 if (dad_failed)
1994 ipv6_ifa_notify(0, ifp);
1995 in6_ifa_put(ifp);
1996 } else {
1997 ipv6_del_addr(ifp);
1998 }
1999 }
2000
2001 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2002 {
2003 int err = -ENOENT;
2004
2005 spin_lock_bh(&ifp->lock);
2006 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2007 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2008 err = 0;
2009 }
2010 spin_unlock_bh(&ifp->lock);
2011
2012 return err;
2013 }
2014
2015 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2016 {
2017 struct inet6_dev *idev = ifp->idev;
2018 struct net *net = dev_net(ifp->idev->dev);
2019
2020 if (addrconf_dad_end(ifp)) {
2021 in6_ifa_put(ifp);
2022 return;
2023 }
2024
2025 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2026 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2027
2028 spin_lock_bh(&ifp->lock);
2029
2030 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2031 struct in6_addr new_addr;
2032 struct inet6_ifaddr *ifp2;
2033 int retries = ifp->stable_privacy_retry + 1;
2034 struct ifa6_config cfg = {
2035 .pfx = &new_addr,
2036 .plen = ifp->prefix_len,
2037 .ifa_flags = ifp->flags,
2038 .valid_lft = ifp->valid_lft,
2039 .preferred_lft = ifp->prefered_lft,
2040 .scope = ifp->scope,
2041 };
2042
2043 if (retries > net->ipv6.sysctl.idgen_retries) {
2044 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2045 ifp->idev->dev->name);
2046 goto errdad;
2047 }
2048
2049 new_addr = ifp->addr;
2050 if (ipv6_generate_stable_address(&new_addr, retries,
2051 idev))
2052 goto errdad;
2053
2054 spin_unlock_bh(&ifp->lock);
2055
2056 if (idev->cnf.max_addresses &&
2057 ipv6_count_addresses(idev) >=
2058 idev->cnf.max_addresses)
2059 goto lock_errdad;
2060
2061 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2062 ifp->idev->dev->name);
2063
2064 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2065 if (IS_ERR(ifp2))
2066 goto lock_errdad;
2067
2068 spin_lock_bh(&ifp2->lock);
2069 ifp2->stable_privacy_retry = retries;
2070 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2071 spin_unlock_bh(&ifp2->lock);
2072
2073 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2074 in6_ifa_put(ifp2);
2075 lock_errdad:
2076 spin_lock_bh(&ifp->lock);
2077 }
2078
2079 errdad:
2080 /* transition from _POSTDAD to _ERRDAD */
2081 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2082 spin_unlock_bh(&ifp->lock);
2083
2084 addrconf_mod_dad_work(ifp, 0);
2085 in6_ifa_put(ifp);
2086 }
2087
2088 /* Join to solicited addr multicast group.
2089 * caller must hold RTNL */
2090 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2091 {
2092 struct in6_addr maddr;
2093
2094 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2095 return;
2096
2097 addrconf_addr_solict_mult(addr, &maddr);
2098 ipv6_dev_mc_inc(dev, &maddr);
2099 }
2100
2101 /* caller must hold RTNL */
2102 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2103 {
2104 struct in6_addr maddr;
2105
2106 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2107 return;
2108
2109 addrconf_addr_solict_mult(addr, &maddr);
2110 __ipv6_dev_mc_dec(idev, &maddr);
2111 }
2112
2113 /* caller must hold RTNL */
2114 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2115 {
2116 struct in6_addr addr;
2117
2118 if (ifp->prefix_len >= 127) /* RFC 6164 */
2119 return;
2120 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2121 if (ipv6_addr_any(&addr))
2122 return;
2123 __ipv6_dev_ac_inc(ifp->idev, &addr);
2124 }
2125
2126 /* caller must hold RTNL */
2127 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2128 {
2129 struct in6_addr addr;
2130
2131 if (ifp->prefix_len >= 127) /* RFC 6164 */
2132 return;
2133 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2134 if (ipv6_addr_any(&addr))
2135 return;
2136 __ipv6_dev_ac_dec(ifp->idev, &addr);
2137 }
2138
2139 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2140 {
2141 switch (dev->addr_len) {
2142 case ETH_ALEN:
2143 memcpy(eui, dev->dev_addr, 3);
2144 eui[3] = 0xFF;
2145 eui[4] = 0xFE;
2146 memcpy(eui + 5, dev->dev_addr + 3, 3);
2147 break;
2148 case EUI64_ADDR_LEN:
2149 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2150 eui[0] ^= 2;
2151 break;
2152 default:
2153 return -1;
2154 }
2155
2156 return 0;
2157 }
2158
2159 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2160 {
2161 union fwnet_hwaddr *ha;
2162
2163 if (dev->addr_len != FWNET_ALEN)
2164 return -1;
2165
2166 ha = (union fwnet_hwaddr *)dev->dev_addr;
2167
2168 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2169 eui[0] ^= 2;
2170 return 0;
2171 }
2172
2173 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2174 {
2175 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2176 if (dev->addr_len != ARCNET_ALEN)
2177 return -1;
2178 memset(eui, 0, 7);
2179 eui[7] = *(u8 *)dev->dev_addr;
2180 return 0;
2181 }
2182
2183 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2184 {
2185 if (dev->addr_len != INFINIBAND_ALEN)
2186 return -1;
2187 memcpy(eui, dev->dev_addr + 12, 8);
2188 eui[0] |= 2;
2189 return 0;
2190 }
2191
2192 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2193 {
2194 if (addr == 0)
2195 return -1;
2196 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2197 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2198 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2199 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2200 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2201 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2202 eui[1] = 0;
2203 eui[2] = 0x5E;
2204 eui[3] = 0xFE;
2205 memcpy(eui + 4, &addr, 4);
2206 return 0;
2207 }
2208
2209 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2210 {
2211 if (dev->priv_flags & IFF_ISATAP)
2212 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2213 return -1;
2214 }
2215
2216 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2217 {
2218 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2219 }
2220
2221 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2222 {
2223 memcpy(eui, dev->perm_addr, 3);
2224 memcpy(eui + 5, dev->perm_addr + 3, 3);
2225 eui[3] = 0xFF;
2226 eui[4] = 0xFE;
2227 eui[0] ^= 2;
2228 return 0;
2229 }
2230
2231 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2232 {
2233 switch (dev->type) {
2234 case ARPHRD_ETHER:
2235 case ARPHRD_FDDI:
2236 return addrconf_ifid_eui48(eui, dev);
2237 case ARPHRD_ARCNET:
2238 return addrconf_ifid_arcnet(eui, dev);
2239 case ARPHRD_INFINIBAND:
2240 return addrconf_ifid_infiniband(eui, dev);
2241 case ARPHRD_SIT:
2242 return addrconf_ifid_sit(eui, dev);
2243 case ARPHRD_IPGRE:
2244 case ARPHRD_TUNNEL:
2245 return addrconf_ifid_gre(eui, dev);
2246 case ARPHRD_6LOWPAN:
2247 return addrconf_ifid_6lowpan(eui, dev);
2248 case ARPHRD_IEEE1394:
2249 return addrconf_ifid_ieee1394(eui, dev);
2250 case ARPHRD_TUNNEL6:
2251 case ARPHRD_IP6GRE:
2252 case ARPHRD_RAWIP:
2253 return addrconf_ifid_ip6tnl(eui, dev);
2254 }
2255 return -1;
2256 }
2257
2258 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2259 {
2260 int err = -1;
2261 struct inet6_ifaddr *ifp;
2262
2263 read_lock_bh(&idev->lock);
2264 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2265 if (ifp->scope > IFA_LINK)
2266 break;
2267 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2268 memcpy(eui, ifp->addr.s6_addr+8, 8);
2269 err = 0;
2270 break;
2271 }
2272 }
2273 read_unlock_bh(&idev->lock);
2274 return err;
2275 }
2276
2277 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2278 static void ipv6_regen_rndid(struct inet6_dev *idev)
2279 {
2280 regen:
2281 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2282 idev->rndid[0] &= ~0x02;
2283
2284 /*
2285 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2286 * check if generated address is not inappropriate
2287 *
2288 * - Reserved subnet anycast (RFC 2526)
2289 * 11111101 11....11 1xxxxxxx
2290 * - ISATAP (RFC4214) 6.1
2291 * 00-00-5E-FE-xx-xx-xx-xx
2292 * - value 0
2293 * - XXX: already assigned to an address on the device
2294 */
2295 if (idev->rndid[0] == 0xfd &&
2296 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2297 (idev->rndid[7]&0x80))
2298 goto regen;
2299 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2300 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2301 goto regen;
2302 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2303 goto regen;
2304 }
2305 }
2306
2307 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2308 {
2309 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2310 ipv6_regen_rndid(idev);
2311 }
2312
2313 /*
2314 * Add prefix route.
2315 */
2316
2317 static void
2318 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2319 struct net_device *dev, unsigned long expires,
2320 u32 flags, gfp_t gfp_flags)
2321 {
2322 struct fib6_config cfg = {
2323 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2324 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2325 .fc_ifindex = dev->ifindex,
2326 .fc_expires = expires,
2327 .fc_dst_len = plen,
2328 .fc_flags = RTF_UP | flags,
2329 .fc_nlinfo.nl_net = dev_net(dev),
2330 .fc_protocol = RTPROT_KERNEL,
2331 .fc_type = RTN_UNICAST,
2332 };
2333
2334 cfg.fc_dst = *pfx;
2335
2336 /* Prevent useless cloning on PtP SIT.
2337 This thing is done here expecting that the whole
2338 class of non-broadcast devices need not cloning.
2339 */
2340 #if IS_ENABLED(CONFIG_IPV6_SIT)
2341 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2342 cfg.fc_flags |= RTF_NONEXTHOP;
2343 #endif
2344
2345 ip6_route_add(&cfg, gfp_flags, NULL);
2346 }
2347
2348
2349 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2350 int plen,
2351 const struct net_device *dev,
2352 u32 flags, u32 noflags)
2353 {
2354 struct fib6_node *fn;
2355 struct fib6_info *rt = NULL;
2356 struct fib6_table *table;
2357 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2358
2359 table = fib6_get_table(dev_net(dev), tb_id);
2360 if (!table)
2361 return NULL;
2362
2363 rcu_read_lock();
2364 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2365 if (!fn)
2366 goto out;
2367
2368 for_each_fib6_node_rt_rcu(fn) {
2369 if (rt->fib6_nh.nh_dev->ifindex != dev->ifindex)
2370 continue;
2371 if ((rt->fib6_flags & flags) != flags)
2372 continue;
2373 if ((rt->fib6_flags & noflags) != 0)
2374 continue;
2375 if (!fib6_info_hold_safe(rt))
2376 continue;
2377 break;
2378 }
2379 out:
2380 rcu_read_unlock();
2381 return rt;
2382 }
2383
2384
2385 /* Create "default" multicast route to the interface */
2386
2387 static void addrconf_add_mroute(struct net_device *dev)
2388 {
2389 struct fib6_config cfg = {
2390 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2391 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2392 .fc_ifindex = dev->ifindex,
2393 .fc_dst_len = 8,
2394 .fc_flags = RTF_UP,
2395 .fc_type = RTN_UNICAST,
2396 .fc_nlinfo.nl_net = dev_net(dev),
2397 };
2398
2399 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2400
2401 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2402 }
2403
2404 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2405 {
2406 struct inet6_dev *idev;
2407
2408 ASSERT_RTNL();
2409
2410 idev = ipv6_find_idev(dev);
2411 if (!idev)
2412 return ERR_PTR(-ENOBUFS);
2413
2414 if (idev->cnf.disable_ipv6)
2415 return ERR_PTR(-EACCES);
2416
2417 /* Add default multicast route */
2418 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2419 addrconf_add_mroute(dev);
2420
2421 return idev;
2422 }
2423
2424 static void manage_tempaddrs(struct inet6_dev *idev,
2425 struct inet6_ifaddr *ifp,
2426 __u32 valid_lft, __u32 prefered_lft,
2427 bool create, unsigned long now)
2428 {
2429 u32 flags;
2430 struct inet6_ifaddr *ift;
2431
2432 read_lock_bh(&idev->lock);
2433 /* update all temporary addresses in the list */
2434 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2435 int age, max_valid, max_prefered;
2436
2437 if (ifp != ift->ifpub)
2438 continue;
2439
2440 /* RFC 4941 section 3.3:
2441 * If a received option will extend the lifetime of a public
2442 * address, the lifetimes of temporary addresses should
2443 * be extended, subject to the overall constraint that no
2444 * temporary addresses should ever remain "valid" or "preferred"
2445 * for a time longer than (TEMP_VALID_LIFETIME) or
2446 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2447 */
2448 age = (now - ift->cstamp) / HZ;
2449 max_valid = idev->cnf.temp_valid_lft - age;
2450 if (max_valid < 0)
2451 max_valid = 0;
2452
2453 max_prefered = idev->cnf.temp_prefered_lft -
2454 idev->desync_factor - age;
2455 if (max_prefered < 0)
2456 max_prefered = 0;
2457
2458 if (valid_lft > max_valid)
2459 valid_lft = max_valid;
2460
2461 if (prefered_lft > max_prefered)
2462 prefered_lft = max_prefered;
2463
2464 spin_lock(&ift->lock);
2465 flags = ift->flags;
2466 ift->valid_lft = valid_lft;
2467 ift->prefered_lft = prefered_lft;
2468 ift->tstamp = now;
2469 if (prefered_lft > 0)
2470 ift->flags &= ~IFA_F_DEPRECATED;
2471
2472 spin_unlock(&ift->lock);
2473 if (!(flags&IFA_F_TENTATIVE))
2474 ipv6_ifa_notify(0, ift);
2475 }
2476
2477 if ((create || list_empty(&idev->tempaddr_list)) &&
2478 idev->cnf.use_tempaddr > 0) {
2479 /* When a new public address is created as described
2480 * in [ADDRCONF], also create a new temporary address.
2481 * Also create a temporary address if it's enabled but
2482 * no temporary address currently exists.
2483 */
2484 read_unlock_bh(&idev->lock);
2485 ipv6_create_tempaddr(ifp, NULL, false);
2486 } else {
2487 read_unlock_bh(&idev->lock);
2488 }
2489 }
2490
2491 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2492 {
2493 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2494 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2495 }
2496
2497 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2498 const struct prefix_info *pinfo,
2499 struct inet6_dev *in6_dev,
2500 const struct in6_addr *addr, int addr_type,
2501 u32 addr_flags, bool sllao, bool tokenized,
2502 __u32 valid_lft, u32 prefered_lft)
2503 {
2504 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2505 int create = 0, update_lft = 0;
2506
2507 if (!ifp && valid_lft) {
2508 int max_addresses = in6_dev->cnf.max_addresses;
2509 struct ifa6_config cfg = {
2510 .pfx = addr,
2511 .plen = pinfo->prefix_len,
2512 .ifa_flags = addr_flags,
2513 .valid_lft = valid_lft,
2514 .preferred_lft = prefered_lft,
2515 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2516 };
2517
2518 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2519 if ((net->ipv6.devconf_all->optimistic_dad ||
2520 in6_dev->cnf.optimistic_dad) &&
2521 !net->ipv6.devconf_all->forwarding && sllao)
2522 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2523 #endif
2524
2525 /* Do not allow to create too much of autoconfigured
2526 * addresses; this would be too easy way to crash kernel.
2527 */
2528 if (!max_addresses ||
2529 ipv6_count_addresses(in6_dev) < max_addresses)
2530 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2531
2532 if (IS_ERR_OR_NULL(ifp))
2533 return -1;
2534
2535 create = 1;
2536 spin_lock_bh(&ifp->lock);
2537 ifp->flags |= IFA_F_MANAGETEMPADDR;
2538 ifp->cstamp = jiffies;
2539 ifp->tokenized = tokenized;
2540 spin_unlock_bh(&ifp->lock);
2541 addrconf_dad_start(ifp);
2542 }
2543
2544 if (ifp) {
2545 u32 flags;
2546 unsigned long now;
2547 u32 stored_lft;
2548
2549 /* update lifetime (RFC2462 5.5.3 e) */
2550 spin_lock_bh(&ifp->lock);
2551 now = jiffies;
2552 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2553 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2554 else
2555 stored_lft = 0;
2556 if (!create && stored_lft) {
2557 const u32 minimum_lft = min_t(u32,
2558 stored_lft, MIN_VALID_LIFETIME);
2559 valid_lft = max(valid_lft, minimum_lft);
2560
2561 /* RFC4862 Section 5.5.3e:
2562 * "Note that the preferred lifetime of the
2563 * corresponding address is always reset to
2564 * the Preferred Lifetime in the received
2565 * Prefix Information option, regardless of
2566 * whether the valid lifetime is also reset or
2567 * ignored."
2568 *
2569 * So we should always update prefered_lft here.
2570 */
2571 update_lft = 1;
2572 }
2573
2574 if (update_lft) {
2575 ifp->valid_lft = valid_lft;
2576 ifp->prefered_lft = prefered_lft;
2577 ifp->tstamp = now;
2578 flags = ifp->flags;
2579 ifp->flags &= ~IFA_F_DEPRECATED;
2580 spin_unlock_bh(&ifp->lock);
2581
2582 if (!(flags&IFA_F_TENTATIVE))
2583 ipv6_ifa_notify(0, ifp);
2584 } else
2585 spin_unlock_bh(&ifp->lock);
2586
2587 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2588 create, now);
2589
2590 in6_ifa_put(ifp);
2591 addrconf_verify();
2592 }
2593
2594 return 0;
2595 }
2596 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2597
2598 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2599 {
2600 struct prefix_info *pinfo;
2601 __u32 valid_lft;
2602 __u32 prefered_lft;
2603 int addr_type, err;
2604 u32 addr_flags = 0;
2605 struct inet6_dev *in6_dev;
2606 struct net *net = dev_net(dev);
2607
2608 pinfo = (struct prefix_info *) opt;
2609
2610 if (len < sizeof(struct prefix_info)) {
2611 netdev_dbg(dev, "addrconf: prefix option too short\n");
2612 return;
2613 }
2614
2615 /*
2616 * Validation checks ([ADDRCONF], page 19)
2617 */
2618
2619 addr_type = ipv6_addr_type(&pinfo->prefix);
2620
2621 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2622 return;
2623
2624 valid_lft = ntohl(pinfo->valid);
2625 prefered_lft = ntohl(pinfo->prefered);
2626
2627 if (prefered_lft > valid_lft) {
2628 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2629 return;
2630 }
2631
2632 in6_dev = in6_dev_get(dev);
2633
2634 if (!in6_dev) {
2635 net_dbg_ratelimited("addrconf: device %s not configured\n",
2636 dev->name);
2637 return;
2638 }
2639
2640 /*
2641 * Two things going on here:
2642 * 1) Add routes for on-link prefixes
2643 * 2) Configure prefixes with the auto flag set
2644 */
2645
2646 if (pinfo->onlink) {
2647 struct fib6_info *rt;
2648 unsigned long rt_expires;
2649
2650 /* Avoid arithmetic overflow. Really, we could
2651 * save rt_expires in seconds, likely valid_lft,
2652 * but it would require division in fib gc, that it
2653 * not good.
2654 */
2655 if (HZ > USER_HZ)
2656 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2657 else
2658 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2659
2660 if (addrconf_finite_timeout(rt_expires))
2661 rt_expires *= HZ;
2662
2663 rt = addrconf_get_prefix_route(&pinfo->prefix,
2664 pinfo->prefix_len,
2665 dev,
2666 RTF_ADDRCONF | RTF_PREFIX_RT,
2667 RTF_GATEWAY | RTF_DEFAULT);
2668
2669 if (rt) {
2670 /* Autoconf prefix route */
2671 if (valid_lft == 0) {
2672 ip6_del_rt(net, rt);
2673 rt = NULL;
2674 } else if (addrconf_finite_timeout(rt_expires)) {
2675 /* not infinity */
2676 fib6_set_expires(rt, jiffies + rt_expires);
2677 } else {
2678 fib6_clean_expires(rt);
2679 }
2680 } else if (valid_lft) {
2681 clock_t expires = 0;
2682 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2683 if (addrconf_finite_timeout(rt_expires)) {
2684 /* not infinity */
2685 flags |= RTF_EXPIRES;
2686 expires = jiffies_to_clock_t(rt_expires);
2687 }
2688 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2689 0, dev, expires, flags,
2690 GFP_ATOMIC);
2691 }
2692 fib6_info_release(rt);
2693 }
2694
2695 /* Try to figure out our local address for this prefix */
2696
2697 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2698 struct in6_addr addr;
2699 bool tokenized = false, dev_addr_generated = false;
2700
2701 if (pinfo->prefix_len == 64) {
2702 memcpy(&addr, &pinfo->prefix, 8);
2703
2704 if (!ipv6_addr_any(&in6_dev->token)) {
2705 read_lock_bh(&in6_dev->lock);
2706 memcpy(addr.s6_addr + 8,
2707 in6_dev->token.s6_addr + 8, 8);
2708 read_unlock_bh(&in6_dev->lock);
2709 tokenized = true;
2710 } else if (is_addr_mode_generate_stable(in6_dev) &&
2711 !ipv6_generate_stable_address(&addr, 0,
2712 in6_dev)) {
2713 addr_flags |= IFA_F_STABLE_PRIVACY;
2714 goto ok;
2715 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2716 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2717 goto put;
2718 } else {
2719 dev_addr_generated = true;
2720 }
2721 goto ok;
2722 }
2723 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2724 pinfo->prefix_len);
2725 goto put;
2726
2727 ok:
2728 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2729 &addr, addr_type,
2730 addr_flags, sllao,
2731 tokenized, valid_lft,
2732 prefered_lft);
2733 if (err)
2734 goto put;
2735
2736 /* Ignore error case here because previous prefix add addr was
2737 * successful which will be notified.
2738 */
2739 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2740 addr_type, addr_flags, sllao,
2741 tokenized, valid_lft,
2742 prefered_lft,
2743 dev_addr_generated);
2744 }
2745 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2746 put:
2747 in6_dev_put(in6_dev);
2748 }
2749
2750 /*
2751 * Set destination address.
2752 * Special case for SIT interfaces where we create a new "virtual"
2753 * device.
2754 */
2755 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2756 {
2757 struct in6_ifreq ireq;
2758 struct net_device *dev;
2759 int err = -EINVAL;
2760
2761 rtnl_lock();
2762
2763 err = -EFAULT;
2764 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2765 goto err_exit;
2766
2767 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2768
2769 err = -ENODEV;
2770 if (!dev)
2771 goto err_exit;
2772
2773 #if IS_ENABLED(CONFIG_IPV6_SIT)
2774 if (dev->type == ARPHRD_SIT) {
2775 const struct net_device_ops *ops = dev->netdev_ops;
2776 struct ifreq ifr;
2777 struct ip_tunnel_parm p;
2778
2779 err = -EADDRNOTAVAIL;
2780 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2781 goto err_exit;
2782
2783 memset(&p, 0, sizeof(p));
2784 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2785 p.iph.saddr = 0;
2786 p.iph.version = 4;
2787 p.iph.ihl = 5;
2788 p.iph.protocol = IPPROTO_IPV6;
2789 p.iph.ttl = 64;
2790 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2791
2792 if (ops->ndo_do_ioctl) {
2793 mm_segment_t oldfs = get_fs();
2794
2795 set_fs(KERNEL_DS);
2796 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2797 set_fs(oldfs);
2798 } else
2799 err = -EOPNOTSUPP;
2800
2801 if (err == 0) {
2802 err = -ENOBUFS;
2803 dev = __dev_get_by_name(net, p.name);
2804 if (!dev)
2805 goto err_exit;
2806 err = dev_open(dev);
2807 }
2808 }
2809 #endif
2810
2811 err_exit:
2812 rtnl_unlock();
2813 return err;
2814 }
2815
2816 static int ipv6_mc_config(struct sock *sk, bool join,
2817 const struct in6_addr *addr, int ifindex)
2818 {
2819 int ret;
2820
2821 ASSERT_RTNL();
2822
2823 lock_sock(sk);
2824 if (join)
2825 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2826 else
2827 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2828 release_sock(sk);
2829
2830 return ret;
2831 }
2832
2833 /*
2834 * Manual configuration of address on an interface
2835 */
2836 static int inet6_addr_add(struct net *net, int ifindex,
2837 struct ifa6_config *cfg,
2838 struct netlink_ext_ack *extack)
2839 {
2840 struct inet6_ifaddr *ifp;
2841 struct inet6_dev *idev;
2842 struct net_device *dev;
2843 unsigned long timeout;
2844 clock_t expires;
2845 u32 flags;
2846
2847 ASSERT_RTNL();
2848
2849 if (cfg->plen > 128)
2850 return -EINVAL;
2851
2852 /* check the lifetime */
2853 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2854 return -EINVAL;
2855
2856 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2857 return -EINVAL;
2858
2859 dev = __dev_get_by_index(net, ifindex);
2860 if (!dev)
2861 return -ENODEV;
2862
2863 idev = addrconf_add_dev(dev);
2864 if (IS_ERR(idev))
2865 return PTR_ERR(idev);
2866
2867 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2868 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2869 true, cfg->pfx, ifindex);
2870
2871 if (ret < 0)
2872 return ret;
2873 }
2874
2875 cfg->scope = ipv6_addr_scope(cfg->pfx);
2876
2877 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2878 if (addrconf_finite_timeout(timeout)) {
2879 expires = jiffies_to_clock_t(timeout * HZ);
2880 cfg->valid_lft = timeout;
2881 flags = RTF_EXPIRES;
2882 } else {
2883 expires = 0;
2884 flags = 0;
2885 cfg->ifa_flags |= IFA_F_PERMANENT;
2886 }
2887
2888 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2889 if (addrconf_finite_timeout(timeout)) {
2890 if (timeout == 0)
2891 cfg->ifa_flags |= IFA_F_DEPRECATED;
2892 cfg->preferred_lft = timeout;
2893 }
2894
2895 ifp = ipv6_add_addr(idev, cfg, true, extack);
2896 if (!IS_ERR(ifp)) {
2897 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2898 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2899 ifp->rt_priority, dev, expires,
2900 flags, GFP_KERNEL);
2901 }
2902
2903 /* Send a netlink notification if DAD is enabled and
2904 * optimistic flag is not set
2905 */
2906 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2907 ipv6_ifa_notify(0, ifp);
2908 /*
2909 * Note that section 3.1 of RFC 4429 indicates
2910 * that the Optimistic flag should not be set for
2911 * manually configured addresses
2912 */
2913 addrconf_dad_start(ifp);
2914 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2915 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2916 cfg->preferred_lft, true, jiffies);
2917 in6_ifa_put(ifp);
2918 addrconf_verify_rtnl();
2919 return 0;
2920 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2921 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2922 cfg->pfx, ifindex);
2923 }
2924
2925 return PTR_ERR(ifp);
2926 }
2927
2928 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2929 const struct in6_addr *pfx, unsigned int plen)
2930 {
2931 struct inet6_ifaddr *ifp;
2932 struct inet6_dev *idev;
2933 struct net_device *dev;
2934
2935 if (plen > 128)
2936 return -EINVAL;
2937
2938 dev = __dev_get_by_index(net, ifindex);
2939 if (!dev)
2940 return -ENODEV;
2941
2942 idev = __in6_dev_get(dev);
2943 if (!idev)
2944 return -ENXIO;
2945
2946 read_lock_bh(&idev->lock);
2947 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2948 if (ifp->prefix_len == plen &&
2949 ipv6_addr_equal(pfx, &ifp->addr)) {
2950 in6_ifa_hold(ifp);
2951 read_unlock_bh(&idev->lock);
2952
2953 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2954 (ifa_flags & IFA_F_MANAGETEMPADDR))
2955 manage_tempaddrs(idev, ifp, 0, 0, false,
2956 jiffies);
2957 ipv6_del_addr(ifp);
2958 addrconf_verify_rtnl();
2959 if (ipv6_addr_is_multicast(pfx)) {
2960 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2961 false, pfx, dev->ifindex);
2962 }
2963 return 0;
2964 }
2965 }
2966 read_unlock_bh(&idev->lock);
2967 return -EADDRNOTAVAIL;
2968 }
2969
2970
2971 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2972 {
2973 struct ifa6_config cfg = {
2974 .ifa_flags = IFA_F_PERMANENT,
2975 .preferred_lft = INFINITY_LIFE_TIME,
2976 .valid_lft = INFINITY_LIFE_TIME,
2977 };
2978 struct in6_ifreq ireq;
2979 int err;
2980
2981 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2982 return -EPERM;
2983
2984 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2985 return -EFAULT;
2986
2987 cfg.pfx = &ireq.ifr6_addr;
2988 cfg.plen = ireq.ifr6_prefixlen;
2989
2990 rtnl_lock();
2991 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
2992 rtnl_unlock();
2993 return err;
2994 }
2995
2996 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2997 {
2998 struct in6_ifreq ireq;
2999 int err;
3000
3001 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3002 return -EPERM;
3003
3004 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3005 return -EFAULT;
3006
3007 rtnl_lock();
3008 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3009 ireq.ifr6_prefixlen);
3010 rtnl_unlock();
3011 return err;
3012 }
3013
3014 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3015 int plen, int scope)
3016 {
3017 struct inet6_ifaddr *ifp;
3018 struct ifa6_config cfg = {
3019 .pfx = addr,
3020 .plen = plen,
3021 .ifa_flags = IFA_F_PERMANENT,
3022 .valid_lft = INFINITY_LIFE_TIME,
3023 .preferred_lft = INFINITY_LIFE_TIME,
3024 .scope = scope
3025 };
3026
3027 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3028 if (!IS_ERR(ifp)) {
3029 spin_lock_bh(&ifp->lock);
3030 ifp->flags &= ~IFA_F_TENTATIVE;
3031 spin_unlock_bh(&ifp->lock);
3032 rt_genid_bump_ipv6(dev_net(idev->dev));
3033 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3034 in6_ifa_put(ifp);
3035 }
3036 }
3037
3038 #if IS_ENABLED(CONFIG_IPV6_SIT)
3039 static void sit_add_v4_addrs(struct inet6_dev *idev)
3040 {
3041 struct in6_addr addr;
3042 struct net_device *dev;
3043 struct net *net = dev_net(idev->dev);
3044 int scope, plen;
3045 u32 pflags = 0;
3046
3047 ASSERT_RTNL();
3048
3049 memset(&addr, 0, sizeof(struct in6_addr));
3050 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3051
3052 if (idev->dev->flags&IFF_POINTOPOINT) {
3053 addr.s6_addr32[0] = htonl(0xfe800000);
3054 scope = IFA_LINK;
3055 plen = 64;
3056 } else {
3057 scope = IPV6_ADDR_COMPATv4;
3058 plen = 96;
3059 pflags |= RTF_NONEXTHOP;
3060 }
3061
3062 if (addr.s6_addr32[3]) {
3063 add_addr(idev, &addr, plen, scope);
3064 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3065 GFP_KERNEL);
3066 return;
3067 }
3068
3069 for_each_netdev(net, dev) {
3070 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3071 if (in_dev && (dev->flags & IFF_UP)) {
3072 struct in_ifaddr *ifa;
3073
3074 int flag = scope;
3075
3076 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
3077
3078 addr.s6_addr32[3] = ifa->ifa_local;
3079
3080 if (ifa->ifa_scope == RT_SCOPE_LINK)
3081 continue;
3082 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3083 if (idev->dev->flags&IFF_POINTOPOINT)
3084 continue;
3085 flag |= IFA_HOST;
3086 }
3087
3088 add_addr(idev, &addr, plen, flag);
3089 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3090 0, pflags, GFP_KERNEL);
3091 }
3092 }
3093 }
3094 }
3095 #endif
3096
3097 static void init_loopback(struct net_device *dev)
3098 {
3099 struct inet6_dev *idev;
3100
3101 /* ::1 */
3102
3103 ASSERT_RTNL();
3104
3105 idev = ipv6_find_idev(dev);
3106 if (!idev) {
3107 pr_debug("%s: add_dev failed\n", __func__);
3108 return;
3109 }
3110
3111 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3112 }
3113
3114 void addrconf_add_linklocal(struct inet6_dev *idev,
3115 const struct in6_addr *addr, u32 flags)
3116 {
3117 struct ifa6_config cfg = {
3118 .pfx = addr,
3119 .plen = 64,
3120 .ifa_flags = flags | IFA_F_PERMANENT,
3121 .valid_lft = INFINITY_LIFE_TIME,
3122 .preferred_lft = INFINITY_LIFE_TIME,
3123 .scope = IFA_LINK
3124 };
3125 struct inet6_ifaddr *ifp;
3126
3127 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3128 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3129 idev->cnf.optimistic_dad) &&
3130 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3131 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3132 #endif
3133
3134 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3135 if (!IS_ERR(ifp)) {
3136 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3137 0, 0, GFP_ATOMIC);
3138 addrconf_dad_start(ifp);
3139 in6_ifa_put(ifp);
3140 }
3141 }
3142 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3143
3144 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3145 {
3146 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3147 return true;
3148
3149 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3150 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3151 return true;
3152
3153 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3154 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3155 return true;
3156
3157 return false;
3158 }
3159
3160 static int ipv6_generate_stable_address(struct in6_addr *address,
3161 u8 dad_count,
3162 const struct inet6_dev *idev)
3163 {
3164 static DEFINE_SPINLOCK(lock);
3165 static __u32 digest[SHA_DIGEST_WORDS];
3166 static __u32 workspace[SHA_WORKSPACE_WORDS];
3167
3168 static union {
3169 char __data[SHA_MESSAGE_BYTES];
3170 struct {
3171 struct in6_addr secret;
3172 __be32 prefix[2];
3173 unsigned char hwaddr[MAX_ADDR_LEN];
3174 u8 dad_count;
3175 } __packed;
3176 } data;
3177
3178 struct in6_addr secret;
3179 struct in6_addr temp;
3180 struct net *net = dev_net(idev->dev);
3181
3182 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3183
3184 if (idev->cnf.stable_secret.initialized)
3185 secret = idev->cnf.stable_secret.secret;
3186 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3187 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3188 else
3189 return -1;
3190
3191 retry:
3192 spin_lock_bh(&lock);
3193
3194 sha_init(digest);
3195 memset(&data, 0, sizeof(data));
3196 memset(workspace, 0, sizeof(workspace));
3197 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3198 data.prefix[0] = address->s6_addr32[0];
3199 data.prefix[1] = address->s6_addr32[1];
3200 data.secret = secret;
3201 data.dad_count = dad_count;
3202
3203 sha_transform(digest, data.__data, workspace);
3204
3205 temp = *address;
3206 temp.s6_addr32[2] = (__force __be32)digest[0];
3207 temp.s6_addr32[3] = (__force __be32)digest[1];
3208
3209 spin_unlock_bh(&lock);
3210
3211 if (ipv6_reserved_interfaceid(temp)) {
3212 dad_count++;
3213 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3214 return -1;
3215 goto retry;
3216 }
3217
3218 *address = temp;
3219 return 0;
3220 }
3221
3222 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3223 {
3224 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3225
3226 if (s->initialized)
3227 return;
3228 s = &idev->cnf.stable_secret;
3229 get_random_bytes(&s->secret, sizeof(s->secret));
3230 s->initialized = true;
3231 }
3232
3233 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3234 {
3235 struct in6_addr addr;
3236
3237 /* no link local addresses on L3 master devices */
3238 if (netif_is_l3_master(idev->dev))
3239 return;
3240
3241 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3242
3243 switch (idev->cnf.addr_gen_mode) {
3244 case IN6_ADDR_GEN_MODE_RANDOM:
3245 ipv6_gen_mode_random_init(idev);
3246 /* fallthrough */
3247 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3248 if (!ipv6_generate_stable_address(&addr, 0, idev))
3249 addrconf_add_linklocal(idev, &addr,
3250 IFA_F_STABLE_PRIVACY);
3251 else if (prefix_route)
3252 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3253 0, 0, GFP_KERNEL);
3254 break;
3255 case IN6_ADDR_GEN_MODE_EUI64:
3256 /* addrconf_add_linklocal also adds a prefix_route and we
3257 * only need to care about prefix routes if ipv6_generate_eui64
3258 * couldn't generate one.
3259 */
3260 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3261 addrconf_add_linklocal(idev, &addr, 0);
3262 else if (prefix_route)
3263 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3264 0, 0, GFP_KERNEL);
3265 break;
3266 case IN6_ADDR_GEN_MODE_NONE:
3267 default:
3268 /* will not add any link local address */
3269 break;
3270 }
3271 }
3272
3273 static void addrconf_dev_config(struct net_device *dev)
3274 {
3275 struct inet6_dev *idev;
3276
3277 ASSERT_RTNL();
3278
3279 if ((dev->type != ARPHRD_ETHER) &&
3280 (dev->type != ARPHRD_FDDI) &&
3281 (dev->type != ARPHRD_ARCNET) &&
3282 (dev->type != ARPHRD_INFINIBAND) &&
3283 (dev->type != ARPHRD_IEEE1394) &&
3284 (dev->type != ARPHRD_TUNNEL6) &&
3285 (dev->type != ARPHRD_6LOWPAN) &&
3286 (dev->type != ARPHRD_IP6GRE) &&
3287 (dev->type != ARPHRD_IPGRE) &&
3288 (dev->type != ARPHRD_TUNNEL) &&
3289 (dev->type != ARPHRD_NONE) &&
3290 (dev->type != ARPHRD_RAWIP)) {
3291 /* Alas, we support only Ethernet autoconfiguration. */
3292 return;
3293 }
3294
3295 idev = addrconf_add_dev(dev);
3296 if (IS_ERR(idev))
3297 return;
3298
3299 /* this device type has no EUI support */
3300 if (dev->type == ARPHRD_NONE &&
3301 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3302 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3303
3304 addrconf_addr_gen(idev, false);
3305 }
3306
3307 #if IS_ENABLED(CONFIG_IPV6_SIT)
3308 static void addrconf_sit_config(struct net_device *dev)
3309 {
3310 struct inet6_dev *idev;
3311
3312 ASSERT_RTNL();
3313
3314 /*
3315 * Configure the tunnel with one of our IPv4
3316 * addresses... we should configure all of
3317 * our v4 addrs in the tunnel
3318 */
3319
3320 idev = ipv6_find_idev(dev);
3321 if (!idev) {
3322 pr_debug("%s: add_dev failed\n", __func__);
3323 return;
3324 }
3325
3326 if (dev->priv_flags & IFF_ISATAP) {
3327 addrconf_addr_gen(idev, false);
3328 return;
3329 }
3330
3331 sit_add_v4_addrs(idev);
3332
3333 if (dev->flags&IFF_POINTOPOINT)
3334 addrconf_add_mroute(dev);
3335 }
3336 #endif
3337
3338 #if IS_ENABLED(CONFIG_NET_IPGRE)
3339 static void addrconf_gre_config(struct net_device *dev)
3340 {
3341 struct inet6_dev *idev;
3342
3343 ASSERT_RTNL();
3344
3345 idev = ipv6_find_idev(dev);
3346 if (!idev) {
3347 pr_debug("%s: add_dev failed\n", __func__);
3348 return;
3349 }
3350
3351 addrconf_addr_gen(idev, true);
3352 if (dev->flags & IFF_POINTOPOINT)
3353 addrconf_add_mroute(dev);
3354 }
3355 #endif
3356
3357 static int fixup_permanent_addr(struct net *net,
3358 struct inet6_dev *idev,
3359 struct inet6_ifaddr *ifp)
3360 {
3361 /* !fib6_node means the host route was removed from the
3362 * FIB, for example, if 'lo' device is taken down. In that
3363 * case regenerate the host route.
3364 */
3365 if (!ifp->rt || !ifp->rt->fib6_node) {
3366 struct fib6_info *f6i, *prev;
3367
3368 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3369 GFP_ATOMIC);
3370 if (IS_ERR(f6i))
3371 return PTR_ERR(f6i);
3372
3373 /* ifp->rt can be accessed outside of rtnl */
3374 spin_lock(&ifp->lock);
3375 prev = ifp->rt;
3376 ifp->rt = f6i;
3377 spin_unlock(&ifp->lock);
3378
3379 fib6_info_release(prev);
3380 }
3381
3382 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3383 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3384 ifp->rt_priority, idev->dev, 0, 0,
3385 GFP_ATOMIC);
3386 }
3387
3388 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3389 addrconf_dad_start(ifp);
3390
3391 return 0;
3392 }
3393
3394 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3395 {
3396 struct inet6_ifaddr *ifp, *tmp;
3397 struct inet6_dev *idev;
3398
3399 idev = __in6_dev_get(dev);
3400 if (!idev)
3401 return;
3402
3403 write_lock_bh(&idev->lock);
3404
3405 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3406 if ((ifp->flags & IFA_F_PERMANENT) &&
3407 fixup_permanent_addr(net, idev, ifp) < 0) {
3408 write_unlock_bh(&idev->lock);
3409 in6_ifa_hold(ifp);
3410 ipv6_del_addr(ifp);
3411 write_lock_bh(&idev->lock);
3412
3413 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3414 idev->dev->name, &ifp->addr);
3415 }
3416 }
3417
3418 write_unlock_bh(&idev->lock);
3419 }
3420
3421 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3422 void *ptr)
3423 {
3424 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3425 struct netdev_notifier_changeupper_info *info;
3426 struct inet6_dev *idev = __in6_dev_get(dev);
3427 struct net *net = dev_net(dev);
3428 int run_pending = 0;
3429 int err;
3430
3431 switch (event) {
3432 case NETDEV_REGISTER:
3433 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3434 idev = ipv6_add_dev(dev);
3435 if (IS_ERR(idev))
3436 return notifier_from_errno(PTR_ERR(idev));
3437 }
3438 break;
3439
3440 case NETDEV_CHANGEMTU:
3441 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3442 if (dev->mtu < IPV6_MIN_MTU) {
3443 addrconf_ifdown(dev, dev != net->loopback_dev);
3444 break;
3445 }
3446
3447 if (idev) {
3448 rt6_mtu_change(dev, dev->mtu);
3449 idev->cnf.mtu6 = dev->mtu;
3450 break;
3451 }
3452
3453 /* allocate new idev */
3454 idev = ipv6_add_dev(dev);
3455 if (IS_ERR(idev))
3456 break;
3457
3458 /* device is still not ready */
3459 if (!(idev->if_flags & IF_READY))
3460 break;
3461
3462 run_pending = 1;
3463
3464 /* fall through */
3465
3466 case NETDEV_UP:
3467 case NETDEV_CHANGE:
3468 if (dev->flags & IFF_SLAVE)
3469 break;
3470
3471 if (idev && idev->cnf.disable_ipv6)
3472 break;
3473
3474 if (event == NETDEV_UP) {
3475 /* restore routes for permanent addresses */
3476 addrconf_permanent_addr(net, dev);
3477
3478 if (!addrconf_link_ready(dev)) {
3479 /* device is not ready yet. */
3480 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3481 dev->name);
3482 break;
3483 }
3484
3485 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3486 idev = ipv6_add_dev(dev);
3487
3488 if (!IS_ERR_OR_NULL(idev)) {
3489 idev->if_flags |= IF_READY;
3490 run_pending = 1;
3491 }
3492 } else if (event == NETDEV_CHANGE) {
3493 if (!addrconf_link_ready(dev)) {
3494 /* device is still not ready. */
3495 rt6_sync_down_dev(dev, event);
3496 break;
3497 }
3498
3499 if (idev) {
3500 if (idev->if_flags & IF_READY) {
3501 /* device is already configured -
3502 * but resend MLD reports, we might
3503 * have roamed and need to update
3504 * multicast snooping switches
3505 */
3506 ipv6_mc_up(idev);
3507 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3508 break;
3509 }
3510 idev->if_flags |= IF_READY;
3511 }
3512
3513 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3514 dev->name);
3515
3516 run_pending = 1;
3517 }
3518
3519 switch (dev->type) {
3520 #if IS_ENABLED(CONFIG_IPV6_SIT)
3521 case ARPHRD_SIT:
3522 addrconf_sit_config(dev);
3523 break;
3524 #endif
3525 #if IS_ENABLED(CONFIG_NET_IPGRE)
3526 case ARPHRD_IPGRE:
3527 addrconf_gre_config(dev);
3528 break;
3529 #endif
3530 case ARPHRD_LOOPBACK:
3531 init_loopback(dev);
3532 break;
3533
3534 default:
3535 addrconf_dev_config(dev);
3536 break;
3537 }
3538
3539 if (!IS_ERR_OR_NULL(idev)) {
3540 if (run_pending)
3541 addrconf_dad_run(idev);
3542
3543 /* Device has an address by now */
3544 rt6_sync_up(dev, RTNH_F_DEAD);
3545
3546 /*
3547 * If the MTU changed during the interface down,
3548 * when the interface up, the changed MTU must be
3549 * reflected in the idev as well as routers.
3550 */
3551 if (idev->cnf.mtu6 != dev->mtu &&
3552 dev->mtu >= IPV6_MIN_MTU) {
3553 rt6_mtu_change(dev, dev->mtu);
3554 idev->cnf.mtu6 = dev->mtu;
3555 }
3556 idev->tstamp = jiffies;
3557 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3558
3559 /*
3560 * If the changed mtu during down is lower than
3561 * IPV6_MIN_MTU stop IPv6 on this interface.
3562 */
3563 if (dev->mtu < IPV6_MIN_MTU)
3564 addrconf_ifdown(dev, dev != net->loopback_dev);
3565 }
3566 break;
3567
3568 case NETDEV_DOWN:
3569 case NETDEV_UNREGISTER:
3570 /*
3571 * Remove all addresses from this interface.
3572 */
3573 addrconf_ifdown(dev, event != NETDEV_DOWN);
3574 break;
3575
3576 case NETDEV_CHANGENAME:
3577 if (idev) {
3578 snmp6_unregister_dev(idev);
3579 addrconf_sysctl_unregister(idev);
3580 err = addrconf_sysctl_register(idev);
3581 if (err)
3582 return notifier_from_errno(err);
3583 err = snmp6_register_dev(idev);
3584 if (err) {
3585 addrconf_sysctl_unregister(idev);
3586 return notifier_from_errno(err);
3587 }
3588 }
3589 break;
3590
3591 case NETDEV_PRE_TYPE_CHANGE:
3592 case NETDEV_POST_TYPE_CHANGE:
3593 if (idev)
3594 addrconf_type_change(dev, event);
3595 break;
3596
3597 case NETDEV_CHANGEUPPER:
3598 info = ptr;
3599
3600 /* flush all routes if dev is linked to or unlinked from
3601 * an L3 master device (e.g., VRF)
3602 */
3603 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3604 addrconf_ifdown(dev, 0);
3605 }
3606
3607 return NOTIFY_OK;
3608 }
3609
3610 /*
3611 * addrconf module should be notified of a device going up
3612 */
3613 static struct notifier_block ipv6_dev_notf = {
3614 .notifier_call = addrconf_notify,
3615 .priority = ADDRCONF_NOTIFY_PRIORITY,
3616 };
3617
3618 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3619 {
3620 struct inet6_dev *idev;
3621 ASSERT_RTNL();
3622
3623 idev = __in6_dev_get(dev);
3624
3625 if (event == NETDEV_POST_TYPE_CHANGE)
3626 ipv6_mc_remap(idev);
3627 else if (event == NETDEV_PRE_TYPE_CHANGE)
3628 ipv6_mc_unmap(idev);
3629 }
3630
3631 static bool addr_is_local(const struct in6_addr *addr)
3632 {
3633 return ipv6_addr_type(addr) &
3634 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3635 }
3636
3637 static int addrconf_ifdown(struct net_device *dev, int how)
3638 {
3639 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3640 struct net *net = dev_net(dev);
3641 struct inet6_dev *idev;
3642 struct inet6_ifaddr *ifa, *tmp;
3643 bool keep_addr = false;
3644 int state, i;
3645
3646 ASSERT_RTNL();
3647
3648 rt6_disable_ip(dev, event);
3649
3650 idev = __in6_dev_get(dev);
3651 if (!idev)
3652 return -ENODEV;
3653
3654 /*
3655 * Step 1: remove reference to ipv6 device from parent device.
3656 * Do not dev_put!
3657 */
3658 if (how) {
3659 idev->dead = 1;
3660
3661 /* protected by rtnl_lock */
3662 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3663
3664 /* Step 1.5: remove snmp6 entry */
3665 snmp6_unregister_dev(idev);
3666
3667 }
3668
3669 /* combine the user config with event to determine if permanent
3670 * addresses are to be removed from address hash table
3671 */
3672 if (!how && !idev->cnf.disable_ipv6) {
3673 /* aggregate the system setting and interface setting */
3674 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3675
3676 if (!_keep_addr)
3677 _keep_addr = idev->cnf.keep_addr_on_down;
3678
3679 keep_addr = (_keep_addr > 0);
3680 }
3681
3682 /* Step 2: clear hash table */
3683 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3684 struct hlist_head *h = &inet6_addr_lst[i];
3685
3686 spin_lock_bh(&addrconf_hash_lock);
3687 restart:
3688 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3689 if (ifa->idev == idev) {
3690 addrconf_del_dad_work(ifa);
3691 /* combined flag + permanent flag decide if
3692 * address is retained on a down event
3693 */
3694 if (!keep_addr ||
3695 !(ifa->flags & IFA_F_PERMANENT) ||
3696 addr_is_local(&ifa->addr)) {
3697 hlist_del_init_rcu(&ifa->addr_lst);
3698 goto restart;
3699 }
3700 }
3701 }
3702 spin_unlock_bh(&addrconf_hash_lock);
3703 }
3704
3705 write_lock_bh(&idev->lock);
3706
3707 addrconf_del_rs_timer(idev);
3708
3709 /* Step 2: clear flags for stateless addrconf */
3710 if (!how)
3711 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3712
3713 /* Step 3: clear tempaddr list */
3714 while (!list_empty(&idev->tempaddr_list)) {
3715 ifa = list_first_entry(&idev->tempaddr_list,
3716 struct inet6_ifaddr, tmp_list);
3717 list_del(&ifa->tmp_list);
3718 write_unlock_bh(&idev->lock);
3719 spin_lock_bh(&ifa->lock);
3720
3721 if (ifa->ifpub) {
3722 in6_ifa_put(ifa->ifpub);
3723 ifa->ifpub = NULL;
3724 }
3725 spin_unlock_bh(&ifa->lock);
3726 in6_ifa_put(ifa);
3727 write_lock_bh(&idev->lock);
3728 }
3729
3730 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3731 struct fib6_info *rt = NULL;
3732 bool keep;
3733
3734 addrconf_del_dad_work(ifa);
3735
3736 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3737 !addr_is_local(&ifa->addr);
3738
3739 write_unlock_bh(&idev->lock);
3740 spin_lock_bh(&ifa->lock);
3741
3742 if (keep) {
3743 /* set state to skip the notifier below */
3744 state = INET6_IFADDR_STATE_DEAD;
3745 ifa->state = INET6_IFADDR_STATE_PREDAD;
3746 if (!(ifa->flags & IFA_F_NODAD))
3747 ifa->flags |= IFA_F_TENTATIVE;
3748
3749 rt = ifa->rt;
3750 ifa->rt = NULL;
3751 } else {
3752 state = ifa->state;
3753 ifa->state = INET6_IFADDR_STATE_DEAD;
3754 }
3755
3756 spin_unlock_bh(&ifa->lock);
3757
3758 if (rt)
3759 ip6_del_rt(net, rt);
3760
3761 if (state != INET6_IFADDR_STATE_DEAD) {
3762 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3763 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3764 } else {
3765 if (idev->cnf.forwarding)
3766 addrconf_leave_anycast(ifa);
3767 addrconf_leave_solict(ifa->idev, &ifa->addr);
3768 }
3769
3770 write_lock_bh(&idev->lock);
3771 if (!keep) {
3772 list_del_rcu(&ifa->if_list);
3773 in6_ifa_put(ifa);
3774 }
3775 }
3776
3777 write_unlock_bh(&idev->lock);
3778
3779 /* Step 5: Discard anycast and multicast list */
3780 if (how) {
3781 ipv6_ac_destroy_dev(idev);
3782 ipv6_mc_destroy_dev(idev);
3783 } else {
3784 ipv6_mc_down(idev);
3785 }
3786
3787 idev->tstamp = jiffies;
3788
3789 /* Last: Shot the device (if unregistered) */
3790 if (how) {
3791 addrconf_sysctl_unregister(idev);
3792 neigh_parms_release(&nd_tbl, idev->nd_parms);
3793 neigh_ifdown(&nd_tbl, dev);
3794 in6_dev_put(idev);
3795 }
3796 return 0;
3797 }
3798
3799 static void addrconf_rs_timer(struct timer_list *t)
3800 {
3801 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3802 struct net_device *dev = idev->dev;
3803 struct in6_addr lladdr;
3804
3805 write_lock(&idev->lock);
3806 if (idev->dead || !(idev->if_flags & IF_READY))
3807 goto out;
3808
3809 if (!ipv6_accept_ra(idev))
3810 goto out;
3811
3812 /* Announcement received after solicitation was sent */
3813 if (idev->if_flags & IF_RA_RCVD)
3814 goto out;
3815
3816 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3817 write_unlock(&idev->lock);
3818 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3819 ndisc_send_rs(dev, &lladdr,
3820 &in6addr_linklocal_allrouters);
3821 else
3822 goto put;
3823
3824 write_lock(&idev->lock);
3825 idev->rs_interval = rfc3315_s14_backoff_update(
3826 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3827 /* The wait after the last probe can be shorter */
3828 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3829 idev->cnf.rtr_solicits) ?
3830 idev->cnf.rtr_solicit_delay :
3831 idev->rs_interval);
3832 } else {
3833 /*
3834 * Note: we do not support deprecated "all on-link"
3835 * assumption any longer.
3836 */
3837 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3838 }
3839
3840 out:
3841 write_unlock(&idev->lock);
3842 put:
3843 in6_dev_put(idev);
3844 }
3845
3846 /*
3847 * Duplicate Address Detection
3848 */
3849 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3850 {
3851 unsigned long rand_num;
3852 struct inet6_dev *idev = ifp->idev;
3853 u64 nonce;
3854
3855 if (ifp->flags & IFA_F_OPTIMISTIC)
3856 rand_num = 0;
3857 else
3858 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3859
3860 nonce = 0;
3861 if (idev->cnf.enhanced_dad ||
3862 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3863 do
3864 get_random_bytes(&nonce, 6);
3865 while (nonce == 0);
3866 }
3867 ifp->dad_nonce = nonce;
3868 ifp->dad_probes = idev->cnf.dad_transmits;
3869 addrconf_mod_dad_work(ifp, rand_num);
3870 }
3871
3872 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3873 {
3874 struct inet6_dev *idev = ifp->idev;
3875 struct net_device *dev = idev->dev;
3876 bool bump_id, notify = false;
3877 struct net *net;
3878
3879 addrconf_join_solict(dev, &ifp->addr);
3880
3881 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3882
3883 read_lock_bh(&idev->lock);
3884 spin_lock(&ifp->lock);
3885 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3886 goto out;
3887
3888 net = dev_net(dev);
3889 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3890 (net->ipv6.devconf_all->accept_dad < 1 &&
3891 idev->cnf.accept_dad < 1) ||
3892 !(ifp->flags&IFA_F_TENTATIVE) ||
3893 ifp->flags & IFA_F_NODAD) {
3894 bool send_na = false;
3895
3896 if (ifp->flags & IFA_F_TENTATIVE &&
3897 !(ifp->flags & IFA_F_OPTIMISTIC))
3898 send_na = true;
3899 bump_id = ifp->flags & IFA_F_TENTATIVE;
3900 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3901 spin_unlock(&ifp->lock);
3902 read_unlock_bh(&idev->lock);
3903
3904 addrconf_dad_completed(ifp, bump_id, send_na);
3905 return;
3906 }
3907
3908 if (!(idev->if_flags & IF_READY)) {
3909 spin_unlock(&ifp->lock);
3910 read_unlock_bh(&idev->lock);
3911 /*
3912 * If the device is not ready:
3913 * - keep it tentative if it is a permanent address.
3914 * - otherwise, kill it.
3915 */
3916 in6_ifa_hold(ifp);
3917 addrconf_dad_stop(ifp, 0);
3918 return;
3919 }
3920
3921 /*
3922 * Optimistic nodes can start receiving
3923 * Frames right away
3924 */
3925 if (ifp->flags & IFA_F_OPTIMISTIC) {
3926 ip6_ins_rt(net, ifp->rt);
3927 if (ipv6_use_optimistic_addr(net, idev)) {
3928 /* Because optimistic nodes can use this address,
3929 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3930 */
3931 notify = true;
3932 }
3933 }
3934
3935 addrconf_dad_kick(ifp);
3936 out:
3937 spin_unlock(&ifp->lock);
3938 read_unlock_bh(&idev->lock);
3939 if (notify)
3940 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3941 }
3942
3943 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3944 {
3945 bool begin_dad = false;
3946
3947 spin_lock_bh(&ifp->lock);
3948 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3949 ifp->state = INET6_IFADDR_STATE_PREDAD;
3950 begin_dad = true;
3951 }
3952 spin_unlock_bh(&ifp->lock);
3953
3954 if (begin_dad)
3955 addrconf_mod_dad_work(ifp, 0);
3956 }
3957
3958 static void addrconf_dad_work(struct work_struct *w)
3959 {
3960 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3961 struct inet6_ifaddr,
3962 dad_work);
3963 struct inet6_dev *idev = ifp->idev;
3964 bool bump_id, disable_ipv6 = false;
3965 struct in6_addr mcaddr;
3966
3967 enum {
3968 DAD_PROCESS,
3969 DAD_BEGIN,
3970 DAD_ABORT,
3971 } action = DAD_PROCESS;
3972
3973 rtnl_lock();
3974
3975 spin_lock_bh(&ifp->lock);
3976 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3977 action = DAD_BEGIN;
3978 ifp->state = INET6_IFADDR_STATE_DAD;
3979 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3980 action = DAD_ABORT;
3981 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3982
3983 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
3984 idev->cnf.accept_dad > 1) &&
3985 !idev->cnf.disable_ipv6 &&
3986 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3987 struct in6_addr addr;
3988
3989 addr.s6_addr32[0] = htonl(0xfe800000);
3990 addr.s6_addr32[1] = 0;
3991
3992 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3993 ipv6_addr_equal(&ifp->addr, &addr)) {
3994 /* DAD failed for link-local based on MAC */
3995 idev->cnf.disable_ipv6 = 1;
3996
3997 pr_info("%s: IPv6 being disabled!\n",
3998 ifp->idev->dev->name);
3999 disable_ipv6 = true;
4000 }
4001 }
4002 }
4003 spin_unlock_bh(&ifp->lock);
4004
4005 if (action == DAD_BEGIN) {
4006 addrconf_dad_begin(ifp);
4007 goto out;
4008 } else if (action == DAD_ABORT) {
4009 in6_ifa_hold(ifp);
4010 addrconf_dad_stop(ifp, 1);
4011 if (disable_ipv6)
4012 addrconf_ifdown(idev->dev, 0);
4013 goto out;
4014 }
4015
4016 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4017 goto out;
4018
4019 write_lock_bh(&idev->lock);
4020 if (idev->dead || !(idev->if_flags & IF_READY)) {
4021 write_unlock_bh(&idev->lock);
4022 goto out;
4023 }
4024
4025 spin_lock(&ifp->lock);
4026 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4027 spin_unlock(&ifp->lock);
4028 write_unlock_bh(&idev->lock);
4029 goto out;
4030 }
4031
4032 if (ifp->dad_probes == 0) {
4033 bool send_na = false;
4034
4035 /*
4036 * DAD was successful
4037 */
4038
4039 if (ifp->flags & IFA_F_TENTATIVE &&
4040 !(ifp->flags & IFA_F_OPTIMISTIC))
4041 send_na = true;
4042 bump_id = ifp->flags & IFA_F_TENTATIVE;
4043 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4044 spin_unlock(&ifp->lock);
4045 write_unlock_bh(&idev->lock);
4046
4047 addrconf_dad_completed(ifp, bump_id, send_na);
4048
4049 goto out;
4050 }
4051
4052 ifp->dad_probes--;
4053 addrconf_mod_dad_work(ifp,
4054 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4055 spin_unlock(&ifp->lock);
4056 write_unlock_bh(&idev->lock);
4057
4058 /* send a neighbour solicitation for our addr */
4059 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4060 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4061 ifp->dad_nonce);
4062 out:
4063 in6_ifa_put(ifp);
4064 rtnl_unlock();
4065 }
4066
4067 /* ifp->idev must be at least read locked */
4068 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4069 {
4070 struct inet6_ifaddr *ifpiter;
4071 struct inet6_dev *idev = ifp->idev;
4072
4073 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4074 if (ifpiter->scope > IFA_LINK)
4075 break;
4076 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4077 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4078 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4079 IFA_F_PERMANENT)
4080 return false;
4081 }
4082 return true;
4083 }
4084
4085 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4086 bool send_na)
4087 {
4088 struct net_device *dev = ifp->idev->dev;
4089 struct in6_addr lladdr;
4090 bool send_rs, send_mld;
4091
4092 addrconf_del_dad_work(ifp);
4093
4094 /*
4095 * Configure the address for reception. Now it is valid.
4096 */
4097
4098 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4099
4100 /* If added prefix is link local and we are prepared to process
4101 router advertisements, start sending router solicitations.
4102 */
4103
4104 read_lock_bh(&ifp->idev->lock);
4105 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4106 send_rs = send_mld &&
4107 ipv6_accept_ra(ifp->idev) &&
4108 ifp->idev->cnf.rtr_solicits != 0 &&
4109 (dev->flags&IFF_LOOPBACK) == 0;
4110 read_unlock_bh(&ifp->idev->lock);
4111
4112 /* While dad is in progress mld report's source address is in6_addrany.
4113 * Resend with proper ll now.
4114 */
4115 if (send_mld)
4116 ipv6_mc_dad_complete(ifp->idev);
4117
4118 /* send unsolicited NA if enabled */
4119 if (send_na &&
4120 (ifp->idev->cnf.ndisc_notify ||
4121 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4122 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4123 /*router=*/ !!ifp->idev->cnf.forwarding,
4124 /*solicited=*/ false, /*override=*/ true,
4125 /*inc_opt=*/ true);
4126 }
4127
4128 if (send_rs) {
4129 /*
4130 * If a host as already performed a random delay
4131 * [...] as part of DAD [...] there is no need
4132 * to delay again before sending the first RS
4133 */
4134 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4135 return;
4136 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4137
4138 write_lock_bh(&ifp->idev->lock);
4139 spin_lock(&ifp->lock);
4140 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4141 ifp->idev->cnf.rtr_solicit_interval);
4142 ifp->idev->rs_probes = 1;
4143 ifp->idev->if_flags |= IF_RS_SENT;
4144 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4145 spin_unlock(&ifp->lock);
4146 write_unlock_bh(&ifp->idev->lock);
4147 }
4148
4149 if (bump_id)
4150 rt_genid_bump_ipv6(dev_net(dev));
4151
4152 /* Make sure that a new temporary address will be created
4153 * before this temporary address becomes deprecated.
4154 */
4155 if (ifp->flags & IFA_F_TEMPORARY)
4156 addrconf_verify_rtnl();
4157 }
4158
4159 static void addrconf_dad_run(struct inet6_dev *idev)
4160 {
4161 struct inet6_ifaddr *ifp;
4162
4163 read_lock_bh(&idev->lock);
4164 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4165 spin_lock(&ifp->lock);
4166 if (ifp->flags & IFA_F_TENTATIVE &&
4167 ifp->state == INET6_IFADDR_STATE_DAD)
4168 addrconf_dad_kick(ifp);
4169 spin_unlock(&ifp->lock);
4170 }
4171 read_unlock_bh(&idev->lock);
4172 }
4173
4174 #ifdef CONFIG_PROC_FS
4175 struct if6_iter_state {
4176 struct seq_net_private p;
4177 int bucket;
4178 int offset;
4179 };
4180
4181 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4182 {
4183 struct if6_iter_state *state = seq->private;
4184 struct net *net = seq_file_net(seq);
4185 struct inet6_ifaddr *ifa = NULL;
4186 int p = 0;
4187
4188 /* initial bucket if pos is 0 */
4189 if (pos == 0) {
4190 state->bucket = 0;
4191 state->offset = 0;
4192 }
4193
4194 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4195 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4196 addr_lst) {
4197 if (!net_eq(dev_net(ifa->idev->dev), net))
4198 continue;
4199 /* sync with offset */
4200 if (p < state->offset) {
4201 p++;
4202 continue;
4203 }
4204 state->offset++;
4205 return ifa;
4206 }
4207
4208 /* prepare for next bucket */
4209 state->offset = 0;
4210 p = 0;
4211 }
4212 return NULL;
4213 }
4214
4215 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4216 struct inet6_ifaddr *ifa)
4217 {
4218 struct if6_iter_state *state = seq->private;
4219 struct net *net = seq_file_net(seq);
4220
4221 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4222 if (!net_eq(dev_net(ifa->idev->dev), net))
4223 continue;
4224 state->offset++;
4225 return ifa;
4226 }
4227
4228 while (++state->bucket < IN6_ADDR_HSIZE) {
4229 state->offset = 0;
4230 hlist_for_each_entry_rcu(ifa,
4231 &inet6_addr_lst[state->bucket], addr_lst) {
4232 if (!net_eq(dev_net(ifa->idev->dev), net))
4233 continue;
4234 state->offset++;
4235 return ifa;
4236 }
4237 }
4238
4239 return NULL;
4240 }
4241
4242 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4243 __acquires(rcu)
4244 {
4245 rcu_read_lock();
4246 return if6_get_first(seq, *pos);
4247 }
4248
4249 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4250 {
4251 struct inet6_ifaddr *ifa;
4252
4253 ifa = if6_get_next(seq, v);
4254 ++*pos;
4255 return ifa;
4256 }
4257
4258 static void if6_seq_stop(struct seq_file *seq, void *v)
4259 __releases(rcu)
4260 {
4261 rcu_read_unlock();
4262 }
4263
4264 static int if6_seq_show(struct seq_file *seq, void *v)
4265 {
4266 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4267 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4268 &ifp->addr,
4269 ifp->idev->dev->ifindex,
4270 ifp->prefix_len,
4271 ifp->scope,
4272 (u8) ifp->flags,
4273 ifp->idev->dev->name);
4274 return 0;
4275 }
4276
4277 static const struct seq_operations if6_seq_ops = {
4278 .start = if6_seq_start,
4279 .next = if6_seq_next,
4280 .show = if6_seq_show,
4281 .stop = if6_seq_stop,
4282 };
4283
4284 static int __net_init if6_proc_net_init(struct net *net)
4285 {
4286 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4287 sizeof(struct if6_iter_state)))
4288 return -ENOMEM;
4289 return 0;
4290 }
4291
4292 static void __net_exit if6_proc_net_exit(struct net *net)
4293 {
4294 remove_proc_entry("if_inet6", net->proc_net);
4295 }
4296
4297 static struct pernet_operations if6_proc_net_ops = {
4298 .init = if6_proc_net_init,
4299 .exit = if6_proc_net_exit,
4300 };
4301
4302 int __init if6_proc_init(void)
4303 {
4304 return register_pernet_subsys(&if6_proc_net_ops);
4305 }
4306
4307 void if6_proc_exit(void)
4308 {
4309 unregister_pernet_subsys(&if6_proc_net_ops);
4310 }
4311 #endif /* CONFIG_PROC_FS */
4312
4313 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4314 /* Check if address is a home address configured on any interface. */
4315 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4316 {
4317 unsigned int hash = inet6_addr_hash(net, addr);
4318 struct inet6_ifaddr *ifp = NULL;
4319 int ret = 0;
4320
4321 rcu_read_lock();
4322 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4323 if (!net_eq(dev_net(ifp->idev->dev), net))
4324 continue;
4325 if (ipv6_addr_equal(&ifp->addr, addr) &&
4326 (ifp->flags & IFA_F_HOMEADDRESS)) {
4327 ret = 1;
4328 break;
4329 }
4330 }
4331 rcu_read_unlock();
4332 return ret;
4333 }
4334 #endif
4335
4336 /*
4337 * Periodic address status verification
4338 */
4339
4340 static void addrconf_verify_rtnl(void)
4341 {
4342 unsigned long now, next, next_sec, next_sched;
4343 struct inet6_ifaddr *ifp;
4344 int i;
4345
4346 ASSERT_RTNL();
4347
4348 rcu_read_lock_bh();
4349 now = jiffies;
4350 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4351
4352 cancel_delayed_work(&addr_chk_work);
4353
4354 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4355 restart:
4356 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4357 unsigned long age;
4358
4359 /* When setting preferred_lft to a value not zero or
4360 * infinity, while valid_lft is infinity
4361 * IFA_F_PERMANENT has a non-infinity life time.
4362 */
4363 if ((ifp->flags & IFA_F_PERMANENT) &&
4364 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4365 continue;
4366
4367 spin_lock(&ifp->lock);
4368 /* We try to batch several events at once. */
4369 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4370
4371 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4372 age >= ifp->valid_lft) {
4373 spin_unlock(&ifp->lock);
4374 in6_ifa_hold(ifp);
4375 ipv6_del_addr(ifp);
4376 goto restart;
4377 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4378 spin_unlock(&ifp->lock);
4379 continue;
4380 } else if (age >= ifp->prefered_lft) {
4381 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4382 int deprecate = 0;
4383
4384 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4385 deprecate = 1;
4386 ifp->flags |= IFA_F_DEPRECATED;
4387 }
4388
4389 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4390 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4391 next = ifp->tstamp + ifp->valid_lft * HZ;
4392
4393 spin_unlock(&ifp->lock);
4394
4395 if (deprecate) {
4396 in6_ifa_hold(ifp);
4397
4398 ipv6_ifa_notify(0, ifp);
4399 in6_ifa_put(ifp);
4400 goto restart;
4401 }
4402 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4403 !(ifp->flags&IFA_F_TENTATIVE)) {
4404 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4405 ifp->idev->cnf.dad_transmits *
4406 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4407
4408 if (age >= ifp->prefered_lft - regen_advance) {
4409 struct inet6_ifaddr *ifpub = ifp->ifpub;
4410 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4411 next = ifp->tstamp + ifp->prefered_lft * HZ;
4412 if (!ifp->regen_count && ifpub) {
4413 ifp->regen_count++;
4414 in6_ifa_hold(ifp);
4415 in6_ifa_hold(ifpub);
4416 spin_unlock(&ifp->lock);
4417
4418 spin_lock(&ifpub->lock);
4419 ifpub->regen_count = 0;
4420 spin_unlock(&ifpub->lock);
4421 rcu_read_unlock_bh();
4422 ipv6_create_tempaddr(ifpub, ifp, true);
4423 in6_ifa_put(ifpub);
4424 in6_ifa_put(ifp);
4425 rcu_read_lock_bh();
4426 goto restart;
4427 }
4428 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4429 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4430 spin_unlock(&ifp->lock);
4431 } else {
4432 /* ifp->prefered_lft <= ifp->valid_lft */
4433 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4434 next = ifp->tstamp + ifp->prefered_lft * HZ;
4435 spin_unlock(&ifp->lock);
4436 }
4437 }
4438 }
4439
4440 next_sec = round_jiffies_up(next);
4441 next_sched = next;
4442
4443 /* If rounded timeout is accurate enough, accept it. */
4444 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4445 next_sched = next_sec;
4446
4447 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4448 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4449 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4450
4451 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4452 now, next, next_sec, next_sched);
4453 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4454 rcu_read_unlock_bh();
4455 }
4456
4457 static void addrconf_verify_work(struct work_struct *w)
4458 {
4459 rtnl_lock();
4460 addrconf_verify_rtnl();
4461 rtnl_unlock();
4462 }
4463
4464 static void addrconf_verify(void)
4465 {
4466 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4467 }
4468
4469 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4470 struct in6_addr **peer_pfx)
4471 {
4472 struct in6_addr *pfx = NULL;
4473
4474 *peer_pfx = NULL;
4475
4476 if (addr)
4477 pfx = nla_data(addr);
4478
4479 if (local) {
4480 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4481 *peer_pfx = pfx;
4482 pfx = nla_data(local);
4483 }
4484
4485 return pfx;
4486 }
4487
4488 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4489 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4490 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4491 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4492 [IFA_FLAGS] = { .len = sizeof(u32) },
4493 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4494 };
4495
4496 static int
4497 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4498 struct netlink_ext_ack *extack)
4499 {
4500 struct net *net = sock_net(skb->sk);
4501 struct ifaddrmsg *ifm;
4502 struct nlattr *tb[IFA_MAX+1];
4503 struct in6_addr *pfx, *peer_pfx;
4504 u32 ifa_flags;
4505 int err;
4506
4507 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4508 extack);
4509 if (err < 0)
4510 return err;
4511
4512 ifm = nlmsg_data(nlh);
4513 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4514 if (!pfx)
4515 return -EINVAL;
4516
4517 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4518
4519 /* We ignore other flags so far. */
4520 ifa_flags &= IFA_F_MANAGETEMPADDR;
4521
4522 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4523 ifm->ifa_prefixlen);
4524 }
4525
4526 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4527 unsigned long expires, u32 flags)
4528 {
4529 struct fib6_info *f6i;
4530 u32 prio;
4531
4532 f6i = addrconf_get_prefix_route(&ifp->addr,
4533 ifp->prefix_len,
4534 ifp->idev->dev,
4535 0, RTF_GATEWAY | RTF_DEFAULT);
4536 if (!f6i)
4537 return -ENOENT;
4538
4539 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4540 if (f6i->fib6_metric != prio) {
4541 /* delete old one */
4542 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4543
4544 /* add new one */
4545 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4546 ifp->rt_priority, ifp->idev->dev,
4547 expires, flags, GFP_KERNEL);
4548 } else {
4549 if (!expires)
4550 fib6_clean_expires(f6i);
4551 else
4552 fib6_set_expires(f6i, expires);
4553
4554 fib6_info_release(f6i);
4555 }
4556
4557 return 0;
4558 }
4559
4560 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4561 {
4562 u32 flags;
4563 clock_t expires;
4564 unsigned long timeout;
4565 bool was_managetempaddr;
4566 bool had_prefixroute;
4567
4568 ASSERT_RTNL();
4569
4570 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4571 return -EINVAL;
4572
4573 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4574 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4575 return -EINVAL;
4576
4577 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4578 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4579
4580 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4581 if (addrconf_finite_timeout(timeout)) {
4582 expires = jiffies_to_clock_t(timeout * HZ);
4583 cfg->valid_lft = timeout;
4584 flags = RTF_EXPIRES;
4585 } else {
4586 expires = 0;
4587 flags = 0;
4588 cfg->ifa_flags |= IFA_F_PERMANENT;
4589 }
4590
4591 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4592 if (addrconf_finite_timeout(timeout)) {
4593 if (timeout == 0)
4594 cfg->ifa_flags |= IFA_F_DEPRECATED;
4595 cfg->preferred_lft = timeout;
4596 }
4597
4598 spin_lock_bh(&ifp->lock);
4599 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4600 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4601 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4602 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4603 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4604 IFA_F_NOPREFIXROUTE);
4605 ifp->flags |= cfg->ifa_flags;
4606 ifp->tstamp = jiffies;
4607 ifp->valid_lft = cfg->valid_lft;
4608 ifp->prefered_lft = cfg->preferred_lft;
4609
4610 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4611 ifp->rt_priority = cfg->rt_priority;
4612
4613 spin_unlock_bh(&ifp->lock);
4614 if (!(ifp->flags&IFA_F_TENTATIVE))
4615 ipv6_ifa_notify(0, ifp);
4616
4617 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4618 int rc = -ENOENT;
4619
4620 if (had_prefixroute)
4621 rc = modify_prefix_route(ifp, expires, flags);
4622
4623 /* prefix route could have been deleted; if so restore it */
4624 if (rc == -ENOENT) {
4625 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4626 ifp->rt_priority, ifp->idev->dev,
4627 expires, flags, GFP_KERNEL);
4628 }
4629 } else if (had_prefixroute) {
4630 enum cleanup_prefix_rt_t action;
4631 unsigned long rt_expires;
4632
4633 write_lock_bh(&ifp->idev->lock);
4634 action = check_cleanup_prefix_route(ifp, &rt_expires);
4635 write_unlock_bh(&ifp->idev->lock);
4636
4637 if (action != CLEANUP_PREFIX_RT_NOP) {
4638 cleanup_prefix_route(ifp, rt_expires,
4639 action == CLEANUP_PREFIX_RT_DEL);
4640 }
4641 }
4642
4643 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4644 if (was_managetempaddr &&
4645 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4646 cfg->valid_lft = 0;
4647 cfg->preferred_lft = 0;
4648 }
4649 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4650 cfg->preferred_lft, !was_managetempaddr,
4651 jiffies);
4652 }
4653
4654 addrconf_verify_rtnl();
4655
4656 return 0;
4657 }
4658
4659 static int
4660 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4661 struct netlink_ext_ack *extack)
4662 {
4663 struct net *net = sock_net(skb->sk);
4664 struct ifaddrmsg *ifm;
4665 struct nlattr *tb[IFA_MAX+1];
4666 struct in6_addr *peer_pfx;
4667 struct inet6_ifaddr *ifa;
4668 struct net_device *dev;
4669 struct inet6_dev *idev;
4670 struct ifa6_config cfg;
4671 int err;
4672
4673 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4674 extack);
4675 if (err < 0)
4676 return err;
4677
4678 memset(&cfg, 0, sizeof(cfg));
4679
4680 ifm = nlmsg_data(nlh);
4681 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4682 if (!cfg.pfx)
4683 return -EINVAL;
4684
4685 cfg.peer_pfx = peer_pfx;
4686 cfg.plen = ifm->ifa_prefixlen;
4687 if (tb[IFA_RT_PRIORITY])
4688 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4689
4690 cfg.valid_lft = INFINITY_LIFE_TIME;
4691 cfg.preferred_lft = INFINITY_LIFE_TIME;
4692
4693 if (tb[IFA_CACHEINFO]) {
4694 struct ifa_cacheinfo *ci;
4695
4696 ci = nla_data(tb[IFA_CACHEINFO]);
4697 cfg.valid_lft = ci->ifa_valid;
4698 cfg.preferred_lft = ci->ifa_prefered;
4699 }
4700
4701 dev = __dev_get_by_index(net, ifm->ifa_index);
4702 if (!dev)
4703 return -ENODEV;
4704
4705 if (tb[IFA_FLAGS])
4706 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4707 else
4708 cfg.ifa_flags = ifm->ifa_flags;
4709
4710 /* We ignore other flags so far. */
4711 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4712 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4713 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4714
4715 idev = ipv6_find_idev(dev);
4716 if (IS_ERR(idev))
4717 return PTR_ERR(idev);
4718
4719 if (!ipv6_allow_optimistic_dad(net, idev))
4720 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4721
4722 if (cfg.ifa_flags & IFA_F_NODAD &&
4723 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4724 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4725 return -EINVAL;
4726 }
4727
4728 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4729 if (!ifa) {
4730 /*
4731 * It would be best to check for !NLM_F_CREATE here but
4732 * userspace already relies on not having to provide this.
4733 */
4734 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4735 }
4736
4737 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4738 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4739 err = -EEXIST;
4740 else
4741 err = inet6_addr_modify(ifa, &cfg);
4742
4743 in6_ifa_put(ifa);
4744
4745 return err;
4746 }
4747
4748 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4749 u8 scope, int ifindex)
4750 {
4751 struct ifaddrmsg *ifm;
4752
4753 ifm = nlmsg_data(nlh);
4754 ifm->ifa_family = AF_INET6;
4755 ifm->ifa_prefixlen = prefixlen;
4756 ifm->ifa_flags = flags;
4757 ifm->ifa_scope = scope;
4758 ifm->ifa_index = ifindex;
4759 }
4760
4761 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4762 unsigned long tstamp, u32 preferred, u32 valid)
4763 {
4764 struct ifa_cacheinfo ci;
4765
4766 ci.cstamp = cstamp_delta(cstamp);
4767 ci.tstamp = cstamp_delta(tstamp);
4768 ci.ifa_prefered = preferred;
4769 ci.ifa_valid = valid;
4770
4771 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4772 }
4773
4774 static inline int rt_scope(int ifa_scope)
4775 {
4776 if (ifa_scope & IFA_HOST)
4777 return RT_SCOPE_HOST;
4778 else if (ifa_scope & IFA_LINK)
4779 return RT_SCOPE_LINK;
4780 else if (ifa_scope & IFA_SITE)
4781 return RT_SCOPE_SITE;
4782 else
4783 return RT_SCOPE_UNIVERSE;
4784 }
4785
4786 static inline int inet6_ifaddr_msgsize(void)
4787 {
4788 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4789 + nla_total_size(16) /* IFA_LOCAL */
4790 + nla_total_size(16) /* IFA_ADDRESS */
4791 + nla_total_size(sizeof(struct ifa_cacheinfo))
4792 + nla_total_size(4) /* IFA_FLAGS */
4793 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4794 }
4795
4796 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4797 u32 portid, u32 seq, int event, unsigned int flags)
4798 {
4799 struct nlmsghdr *nlh;
4800 u32 preferred, valid;
4801
4802 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4803 if (!nlh)
4804 return -EMSGSIZE;
4805
4806 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4807 ifa->idev->dev->ifindex);
4808
4809 if (!((ifa->flags&IFA_F_PERMANENT) &&
4810 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4811 preferred = ifa->prefered_lft;
4812 valid = ifa->valid_lft;
4813 if (preferred != INFINITY_LIFE_TIME) {
4814 long tval = (jiffies - ifa->tstamp)/HZ;
4815 if (preferred > tval)
4816 preferred -= tval;
4817 else
4818 preferred = 0;
4819 if (valid != INFINITY_LIFE_TIME) {
4820 if (valid > tval)
4821 valid -= tval;
4822 else
4823 valid = 0;
4824 }
4825 }
4826 } else {
4827 preferred = INFINITY_LIFE_TIME;
4828 valid = INFINITY_LIFE_TIME;
4829 }
4830
4831 if (!ipv6_addr_any(&ifa->peer_addr)) {
4832 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4833 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4834 goto error;
4835 } else
4836 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4837 goto error;
4838
4839 if (ifa->rt_priority &&
4840 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4841 goto error;
4842
4843 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4844 goto error;
4845
4846 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4847 goto error;
4848
4849 nlmsg_end(skb, nlh);
4850 return 0;
4851
4852 error:
4853 nlmsg_cancel(skb, nlh);
4854 return -EMSGSIZE;
4855 }
4856
4857 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4858 u32 portid, u32 seq, int event, u16 flags)
4859 {
4860 struct nlmsghdr *nlh;
4861 u8 scope = RT_SCOPE_UNIVERSE;
4862 int ifindex = ifmca->idev->dev->ifindex;
4863
4864 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4865 scope = RT_SCOPE_SITE;
4866
4867 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4868 if (!nlh)
4869 return -EMSGSIZE;
4870
4871 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4872 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4873 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4874 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4875 nlmsg_cancel(skb, nlh);
4876 return -EMSGSIZE;
4877 }
4878
4879 nlmsg_end(skb, nlh);
4880 return 0;
4881 }
4882
4883 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4884 u32 portid, u32 seq, int event, unsigned int flags)
4885 {
4886 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
4887 int ifindex = dev ? dev->ifindex : 1;
4888 struct nlmsghdr *nlh;
4889 u8 scope = RT_SCOPE_UNIVERSE;
4890
4891 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4892 scope = RT_SCOPE_SITE;
4893
4894 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4895 if (!nlh)
4896 return -EMSGSIZE;
4897
4898 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4899 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4900 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4901 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4902 nlmsg_cancel(skb, nlh);
4903 return -EMSGSIZE;
4904 }
4905
4906 nlmsg_end(skb, nlh);
4907 return 0;
4908 }
4909
4910 enum addr_type_t {
4911 UNICAST_ADDR,
4912 MULTICAST_ADDR,
4913 ANYCAST_ADDR,
4914 };
4915
4916 /* called with rcu_read_lock() */
4917 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4918 struct netlink_callback *cb, enum addr_type_t type,
4919 int s_ip_idx, int *p_ip_idx)
4920 {
4921 struct ifmcaddr6 *ifmca;
4922 struct ifacaddr6 *ifaca;
4923 int err = 1;
4924 int ip_idx = *p_ip_idx;
4925
4926 read_lock_bh(&idev->lock);
4927 switch (type) {
4928 case UNICAST_ADDR: {
4929 struct inet6_ifaddr *ifa;
4930
4931 /* unicast address incl. temp addr */
4932 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4933 if (++ip_idx < s_ip_idx)
4934 continue;
4935 err = inet6_fill_ifaddr(skb, ifa,
4936 NETLINK_CB(cb->skb).portid,
4937 cb->nlh->nlmsg_seq,
4938 RTM_NEWADDR,
4939 NLM_F_MULTI);
4940 if (err < 0)
4941 break;
4942 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4943 }
4944 break;
4945 }
4946 case MULTICAST_ADDR:
4947 /* multicast address */
4948 for (ifmca = idev->mc_list; ifmca;
4949 ifmca = ifmca->next, ip_idx++) {
4950 if (ip_idx < s_ip_idx)
4951 continue;
4952 err = inet6_fill_ifmcaddr(skb, ifmca,
4953 NETLINK_CB(cb->skb).portid,
4954 cb->nlh->nlmsg_seq,
4955 RTM_GETMULTICAST,
4956 NLM_F_MULTI);
4957 if (err < 0)
4958 break;
4959 }
4960 break;
4961 case ANYCAST_ADDR:
4962 /* anycast address */
4963 for (ifaca = idev->ac_list; ifaca;
4964 ifaca = ifaca->aca_next, ip_idx++) {
4965 if (ip_idx < s_ip_idx)
4966 continue;
4967 err = inet6_fill_ifacaddr(skb, ifaca,
4968 NETLINK_CB(cb->skb).portid,
4969 cb->nlh->nlmsg_seq,
4970 RTM_GETANYCAST,
4971 NLM_F_MULTI);
4972 if (err < 0)
4973 break;
4974 }
4975 break;
4976 default:
4977 break;
4978 }
4979 read_unlock_bh(&idev->lock);
4980 *p_ip_idx = ip_idx;
4981 return err;
4982 }
4983
4984 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4985 enum addr_type_t type)
4986 {
4987 struct net *net = sock_net(skb->sk);
4988 int h, s_h;
4989 int idx, ip_idx;
4990 int s_idx, s_ip_idx;
4991 struct net_device *dev;
4992 struct inet6_dev *idev;
4993 struct hlist_head *head;
4994
4995 s_h = cb->args[0];
4996 s_idx = idx = cb->args[1];
4997 s_ip_idx = ip_idx = cb->args[2];
4998
4999 rcu_read_lock();
5000 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
5001 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5002 idx = 0;
5003 head = &net->dev_index_head[h];
5004 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5005 if (idx < s_idx)
5006 goto cont;
5007 if (h > s_h || idx > s_idx)
5008 s_ip_idx = 0;
5009 ip_idx = 0;
5010 idev = __in6_dev_get(dev);
5011 if (!idev)
5012 goto cont;
5013
5014 if (in6_dump_addrs(idev, skb, cb, type,
5015 s_ip_idx, &ip_idx) < 0)
5016 goto done;
5017 cont:
5018 idx++;
5019 }
5020 }
5021 done:
5022 rcu_read_unlock();
5023 cb->args[0] = h;
5024 cb->args[1] = idx;
5025 cb->args[2] = ip_idx;
5026
5027 return skb->len;
5028 }
5029
5030 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5031 {
5032 enum addr_type_t type = UNICAST_ADDR;
5033
5034 return inet6_dump_addr(skb, cb, type);
5035 }
5036
5037 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5038 {
5039 enum addr_type_t type = MULTICAST_ADDR;
5040
5041 return inet6_dump_addr(skb, cb, type);
5042 }
5043
5044
5045 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5046 {
5047 enum addr_type_t type = ANYCAST_ADDR;
5048
5049 return inet6_dump_addr(skb, cb, type);
5050 }
5051
5052 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5053 struct netlink_ext_ack *extack)
5054 {
5055 struct net *net = sock_net(in_skb->sk);
5056 struct ifaddrmsg *ifm;
5057 struct nlattr *tb[IFA_MAX+1];
5058 struct in6_addr *addr = NULL, *peer;
5059 struct net_device *dev = NULL;
5060 struct inet6_ifaddr *ifa;
5061 struct sk_buff *skb;
5062 int err;
5063
5064 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
5065 extack);
5066 if (err < 0)
5067 return err;
5068
5069 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5070 if (!addr)
5071 return -EINVAL;
5072
5073 ifm = nlmsg_data(nlh);
5074 if (ifm->ifa_index)
5075 dev = dev_get_by_index(net, ifm->ifa_index);
5076
5077 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
5078 if (!ifa) {
5079 err = -EADDRNOTAVAIL;
5080 goto errout;
5081 }
5082
5083 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5084 if (!skb) {
5085 err = -ENOBUFS;
5086 goto errout_ifa;
5087 }
5088
5089 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
5090 nlh->nlmsg_seq, RTM_NEWADDR, 0);
5091 if (err < 0) {
5092 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5093 WARN_ON(err == -EMSGSIZE);
5094 kfree_skb(skb);
5095 goto errout_ifa;
5096 }
5097 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
5098 errout_ifa:
5099 in6_ifa_put(ifa);
5100 errout:
5101 if (dev)
5102 dev_put(dev);
5103 return err;
5104 }
5105
5106 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5107 {
5108 struct sk_buff *skb;
5109 struct net *net = dev_net(ifa->idev->dev);
5110 int err = -ENOBUFS;
5111
5112 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5113 if (!skb)
5114 goto errout;
5115
5116 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
5117 if (err < 0) {
5118 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5119 WARN_ON(err == -EMSGSIZE);
5120 kfree_skb(skb);
5121 goto errout;
5122 }
5123 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5124 return;
5125 errout:
5126 if (err < 0)
5127 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5128 }
5129
5130 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5131 __s32 *array, int bytes)
5132 {
5133 BUG_ON(bytes < (DEVCONF_MAX * 4));
5134
5135 memset(array, 0, bytes);
5136 array[DEVCONF_FORWARDING] = cnf->forwarding;
5137 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5138 array[DEVCONF_MTU6] = cnf->mtu6;
5139 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5140 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5141 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5142 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5143 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5144 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5145 jiffies_to_msecs(cnf->rtr_solicit_interval);
5146 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5147 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5148 array[DEVCONF_RTR_SOLICIT_DELAY] =
5149 jiffies_to_msecs(cnf->rtr_solicit_delay);
5150 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5151 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5152 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5153 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5154 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5155 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5156 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5157 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5158 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5159 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5160 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5161 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5162 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5163 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5164 #ifdef CONFIG_IPV6_ROUTER_PREF
5165 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5166 array[DEVCONF_RTR_PROBE_INTERVAL] =
5167 jiffies_to_msecs(cnf->rtr_probe_interval);
5168 #ifdef CONFIG_IPV6_ROUTE_INFO
5169 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5170 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5171 #endif
5172 #endif
5173 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5174 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5175 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5176 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5177 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5178 #endif
5179 #ifdef CONFIG_IPV6_MROUTE
5180 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5181 #endif
5182 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5183 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5184 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5185 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5186 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5187 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5188 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5189 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5190 /* we omit DEVCONF_STABLE_SECRET for now */
5191 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5192 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5193 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5194 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5195 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5196 #ifdef CONFIG_IPV6_SEG6_HMAC
5197 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5198 #endif
5199 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5200 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5201 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5202 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5203 }
5204
5205 static inline size_t inet6_ifla6_size(void)
5206 {
5207 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5208 + nla_total_size(sizeof(struct ifla_cacheinfo))
5209 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5210 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5211 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5212 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5213 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5214 + 0;
5215 }
5216
5217 static inline size_t inet6_if_nlmsg_size(void)
5218 {
5219 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5220 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5221 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5222 + nla_total_size(4) /* IFLA_MTU */
5223 + nla_total_size(4) /* IFLA_LINK */
5224 + nla_total_size(1) /* IFLA_OPERSTATE */
5225 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5226 }
5227
5228 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5229 int bytes)
5230 {
5231 int i;
5232 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5233 BUG_ON(pad < 0);
5234
5235 /* Use put_unaligned() because stats may not be aligned for u64. */
5236 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5237 for (i = 1; i < ICMP6_MIB_MAX; i++)
5238 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5239
5240 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5241 }
5242
5243 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5244 int bytes, size_t syncpoff)
5245 {
5246 int i, c;
5247 u64 buff[IPSTATS_MIB_MAX];
5248 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5249
5250 BUG_ON(pad < 0);
5251
5252 memset(buff, 0, sizeof(buff));
5253 buff[0] = IPSTATS_MIB_MAX;
5254
5255 for_each_possible_cpu(c) {
5256 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5257 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5258 }
5259
5260 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5261 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5262 }
5263
5264 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5265 int bytes)
5266 {
5267 switch (attrtype) {
5268 case IFLA_INET6_STATS:
5269 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5270 offsetof(struct ipstats_mib, syncp));
5271 break;
5272 case IFLA_INET6_ICMP6STATS:
5273 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5274 break;
5275 }
5276 }
5277
5278 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5279 u32 ext_filter_mask)
5280 {
5281 struct nlattr *nla;
5282 struct ifla_cacheinfo ci;
5283
5284 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5285 goto nla_put_failure;
5286 ci.max_reasm_len = IPV6_MAXPLEN;
5287 ci.tstamp = cstamp_delta(idev->tstamp);
5288 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5289 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5290 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5291 goto nla_put_failure;
5292 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5293 if (!nla)
5294 goto nla_put_failure;
5295 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5296
5297 /* XXX - MC not implemented */
5298
5299 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5300 return 0;
5301
5302 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5303 if (!nla)
5304 goto nla_put_failure;
5305 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5306
5307 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5308 if (!nla)
5309 goto nla_put_failure;
5310 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5311
5312 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5313 if (!nla)
5314 goto nla_put_failure;
5315
5316 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5317 goto nla_put_failure;
5318
5319 read_lock_bh(&idev->lock);
5320 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5321 read_unlock_bh(&idev->lock);
5322
5323 return 0;
5324
5325 nla_put_failure:
5326 return -EMSGSIZE;
5327 }
5328
5329 static size_t inet6_get_link_af_size(const struct net_device *dev,
5330 u32 ext_filter_mask)
5331 {
5332 if (!__in6_dev_get(dev))
5333 return 0;
5334
5335 return inet6_ifla6_size();
5336 }
5337
5338 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5339 u32 ext_filter_mask)
5340 {
5341 struct inet6_dev *idev = __in6_dev_get(dev);
5342
5343 if (!idev)
5344 return -ENODATA;
5345
5346 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5347 return -EMSGSIZE;
5348
5349 return 0;
5350 }
5351
5352 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5353 {
5354 struct inet6_ifaddr *ifp;
5355 struct net_device *dev = idev->dev;
5356 bool clear_token, update_rs = false;
5357 struct in6_addr ll_addr;
5358
5359 ASSERT_RTNL();
5360
5361 if (!token)
5362 return -EINVAL;
5363 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5364 return -EINVAL;
5365 if (!ipv6_accept_ra(idev))
5366 return -EINVAL;
5367 if (idev->cnf.rtr_solicits == 0)
5368 return -EINVAL;
5369
5370 write_lock_bh(&idev->lock);
5371
5372 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5373 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5374
5375 write_unlock_bh(&idev->lock);
5376
5377 clear_token = ipv6_addr_any(token);
5378 if (clear_token)
5379 goto update_lft;
5380
5381 if (!idev->dead && (idev->if_flags & IF_READY) &&
5382 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5383 IFA_F_OPTIMISTIC)) {
5384 /* If we're not ready, then normal ifup will take care
5385 * of this. Otherwise, we need to request our rs here.
5386 */
5387 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5388 update_rs = true;
5389 }
5390
5391 update_lft:
5392 write_lock_bh(&idev->lock);
5393
5394 if (update_rs) {
5395 idev->if_flags |= IF_RS_SENT;
5396 idev->rs_interval = rfc3315_s14_backoff_init(
5397 idev->cnf.rtr_solicit_interval);
5398 idev->rs_probes = 1;
5399 addrconf_mod_rs_timer(idev, idev->rs_interval);
5400 }
5401
5402 /* Well, that's kinda nasty ... */
5403 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5404 spin_lock(&ifp->lock);
5405 if (ifp->tokenized) {
5406 ifp->valid_lft = 0;
5407 ifp->prefered_lft = 0;
5408 }
5409 spin_unlock(&ifp->lock);
5410 }
5411
5412 write_unlock_bh(&idev->lock);
5413 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5414 addrconf_verify_rtnl();
5415 return 0;
5416 }
5417
5418 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5419 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5420 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5421 };
5422
5423 static int inet6_validate_link_af(const struct net_device *dev,
5424 const struct nlattr *nla)
5425 {
5426 struct nlattr *tb[IFLA_INET6_MAX + 1];
5427
5428 if (dev && !__in6_dev_get(dev))
5429 return -EAFNOSUPPORT;
5430
5431 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5432 NULL);
5433 }
5434
5435 static int check_addr_gen_mode(int mode)
5436 {
5437 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5438 mode != IN6_ADDR_GEN_MODE_NONE &&
5439 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5440 mode != IN6_ADDR_GEN_MODE_RANDOM)
5441 return -EINVAL;
5442 return 1;
5443 }
5444
5445 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5446 int mode)
5447 {
5448 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5449 !idev->cnf.stable_secret.initialized &&
5450 !net->ipv6.devconf_dflt->stable_secret.initialized)
5451 return -EINVAL;
5452 return 1;
5453 }
5454
5455 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5456 {
5457 int err = -EINVAL;
5458 struct inet6_dev *idev = __in6_dev_get(dev);
5459 struct nlattr *tb[IFLA_INET6_MAX + 1];
5460
5461 if (!idev)
5462 return -EAFNOSUPPORT;
5463
5464 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5465 BUG();
5466
5467 if (tb[IFLA_INET6_TOKEN]) {
5468 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5469 if (err)
5470 return err;
5471 }
5472
5473 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5474 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5475
5476 if (check_addr_gen_mode(mode) < 0 ||
5477 check_stable_privacy(idev, dev_net(dev), mode) < 0)
5478 return -EINVAL;
5479
5480 idev->cnf.addr_gen_mode = mode;
5481 err = 0;
5482 }
5483
5484 return err;
5485 }
5486
5487 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5488 u32 portid, u32 seq, int event, unsigned int flags)
5489 {
5490 struct net_device *dev = idev->dev;
5491 struct ifinfomsg *hdr;
5492 struct nlmsghdr *nlh;
5493 void *protoinfo;
5494
5495 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5496 if (!nlh)
5497 return -EMSGSIZE;
5498
5499 hdr = nlmsg_data(nlh);
5500 hdr->ifi_family = AF_INET6;
5501 hdr->__ifi_pad = 0;
5502 hdr->ifi_type = dev->type;
5503 hdr->ifi_index = dev->ifindex;
5504 hdr->ifi_flags = dev_get_flags(dev);
5505 hdr->ifi_change = 0;
5506
5507 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5508 (dev->addr_len &&
5509 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5510 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5511 (dev->ifindex != dev_get_iflink(dev) &&
5512 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5513 nla_put_u8(skb, IFLA_OPERSTATE,
5514 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5515 goto nla_put_failure;
5516 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5517 if (!protoinfo)
5518 goto nla_put_failure;
5519
5520 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5521 goto nla_put_failure;
5522
5523 nla_nest_end(skb, protoinfo);
5524 nlmsg_end(skb, nlh);
5525 return 0;
5526
5527 nla_put_failure:
5528 nlmsg_cancel(skb, nlh);
5529 return -EMSGSIZE;
5530 }
5531
5532 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5533 {
5534 struct net *net = sock_net(skb->sk);
5535 int h, s_h;
5536 int idx = 0, s_idx;
5537 struct net_device *dev;
5538 struct inet6_dev *idev;
5539 struct hlist_head *head;
5540
5541 s_h = cb->args[0];
5542 s_idx = cb->args[1];
5543
5544 rcu_read_lock();
5545 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5546 idx = 0;
5547 head = &net->dev_index_head[h];
5548 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5549 if (idx < s_idx)
5550 goto cont;
5551 idev = __in6_dev_get(dev);
5552 if (!idev)
5553 goto cont;
5554 if (inet6_fill_ifinfo(skb, idev,
5555 NETLINK_CB(cb->skb).portid,
5556 cb->nlh->nlmsg_seq,
5557 RTM_NEWLINK, NLM_F_MULTI) < 0)
5558 goto out;
5559 cont:
5560 idx++;
5561 }
5562 }
5563 out:
5564 rcu_read_unlock();
5565 cb->args[1] = idx;
5566 cb->args[0] = h;
5567
5568 return skb->len;
5569 }
5570
5571 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5572 {
5573 struct sk_buff *skb;
5574 struct net *net = dev_net(idev->dev);
5575 int err = -ENOBUFS;
5576
5577 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5578 if (!skb)
5579 goto errout;
5580
5581 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5582 if (err < 0) {
5583 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5584 WARN_ON(err == -EMSGSIZE);
5585 kfree_skb(skb);
5586 goto errout;
5587 }
5588 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5589 return;
5590 errout:
5591 if (err < 0)
5592 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5593 }
5594
5595 static inline size_t inet6_prefix_nlmsg_size(void)
5596 {
5597 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5598 + nla_total_size(sizeof(struct in6_addr))
5599 + nla_total_size(sizeof(struct prefix_cacheinfo));
5600 }
5601
5602 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5603 struct prefix_info *pinfo, u32 portid, u32 seq,
5604 int event, unsigned int flags)
5605 {
5606 struct prefixmsg *pmsg;
5607 struct nlmsghdr *nlh;
5608 struct prefix_cacheinfo ci;
5609
5610 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5611 if (!nlh)
5612 return -EMSGSIZE;
5613
5614 pmsg = nlmsg_data(nlh);
5615 pmsg->prefix_family = AF_INET6;
5616 pmsg->prefix_pad1 = 0;
5617 pmsg->prefix_pad2 = 0;
5618 pmsg->prefix_ifindex = idev->dev->ifindex;
5619 pmsg->prefix_len = pinfo->prefix_len;
5620 pmsg->prefix_type = pinfo->type;
5621 pmsg->prefix_pad3 = 0;
5622 pmsg->prefix_flags = 0;
5623 if (pinfo->onlink)
5624 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5625 if (pinfo->autoconf)
5626 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5627
5628 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5629 goto nla_put_failure;
5630 ci.preferred_time = ntohl(pinfo->prefered);
5631 ci.valid_time = ntohl(pinfo->valid);
5632 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5633 goto nla_put_failure;
5634 nlmsg_end(skb, nlh);
5635 return 0;
5636
5637 nla_put_failure:
5638 nlmsg_cancel(skb, nlh);
5639 return -EMSGSIZE;
5640 }
5641
5642 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5643 struct prefix_info *pinfo)
5644 {
5645 struct sk_buff *skb;
5646 struct net *net = dev_net(idev->dev);
5647 int err = -ENOBUFS;
5648
5649 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5650 if (!skb)
5651 goto errout;
5652
5653 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5654 if (err < 0) {
5655 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5656 WARN_ON(err == -EMSGSIZE);
5657 kfree_skb(skb);
5658 goto errout;
5659 }
5660 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5661 return;
5662 errout:
5663 if (err < 0)
5664 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5665 }
5666
5667 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5668 {
5669 struct net *net = dev_net(ifp->idev->dev);
5670
5671 if (event)
5672 ASSERT_RTNL();
5673
5674 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5675
5676 switch (event) {
5677 case RTM_NEWADDR:
5678 /*
5679 * If the address was optimistic
5680 * we inserted the route at the start of
5681 * our DAD process, so we don't need
5682 * to do it again
5683 */
5684 if (!rcu_access_pointer(ifp->rt->fib6_node))
5685 ip6_ins_rt(net, ifp->rt);
5686 if (ifp->idev->cnf.forwarding)
5687 addrconf_join_anycast(ifp);
5688 if (!ipv6_addr_any(&ifp->peer_addr))
5689 addrconf_prefix_route(&ifp->peer_addr, 128, 0,
5690 ifp->idev->dev, 0, 0,
5691 GFP_ATOMIC);
5692 break;
5693 case RTM_DELADDR:
5694 if (ifp->idev->cnf.forwarding)
5695 addrconf_leave_anycast(ifp);
5696 addrconf_leave_solict(ifp->idev, &ifp->addr);
5697 if (!ipv6_addr_any(&ifp->peer_addr)) {
5698 struct fib6_info *rt;
5699
5700 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5701 ifp->idev->dev, 0, 0);
5702 if (rt)
5703 ip6_del_rt(net, rt);
5704 }
5705 if (ifp->rt) {
5706 ip6_del_rt(net, ifp->rt);
5707 ifp->rt = NULL;
5708 }
5709 rt_genid_bump_ipv6(net);
5710 break;
5711 }
5712 atomic_inc(&net->ipv6.dev_addr_genid);
5713 }
5714
5715 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5716 {
5717 rcu_read_lock_bh();
5718 if (likely(ifp->idev->dead == 0))
5719 __ipv6_ifa_notify(event, ifp);
5720 rcu_read_unlock_bh();
5721 }
5722
5723 #ifdef CONFIG_SYSCTL
5724
5725 static
5726 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5727 void __user *buffer, size_t *lenp, loff_t *ppos)
5728 {
5729 int *valp = ctl->data;
5730 int val = *valp;
5731 loff_t pos = *ppos;
5732 struct ctl_table lctl;
5733 int ret;
5734
5735 /*
5736 * ctl->data points to idev->cnf.forwarding, we should
5737 * not modify it until we get the rtnl lock.
5738 */
5739 lctl = *ctl;
5740 lctl.data = &val;
5741
5742 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5743
5744 if (write)
5745 ret = addrconf_fixup_forwarding(ctl, valp, val);
5746 if (ret)
5747 *ppos = pos;
5748 return ret;
5749 }
5750
5751 static
5752 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5753 void __user *buffer, size_t *lenp, loff_t *ppos)
5754 {
5755 struct inet6_dev *idev = ctl->extra1;
5756 int min_mtu = IPV6_MIN_MTU;
5757 struct ctl_table lctl;
5758
5759 lctl = *ctl;
5760 lctl.extra1 = &min_mtu;
5761 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5762
5763 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5764 }
5765
5766 static void dev_disable_change(struct inet6_dev *idev)
5767 {
5768 struct netdev_notifier_info info;
5769
5770 if (!idev || !idev->dev)
5771 return;
5772
5773 netdev_notifier_info_init(&info, idev->dev);
5774 if (idev->cnf.disable_ipv6)
5775 addrconf_notify(NULL, NETDEV_DOWN, &info);
5776 else
5777 addrconf_notify(NULL, NETDEV_UP, &info);
5778 }
5779
5780 static void addrconf_disable_change(struct net *net, __s32 newf)
5781 {
5782 struct net_device *dev;
5783 struct inet6_dev *idev;
5784
5785 for_each_netdev(net, dev) {
5786 idev = __in6_dev_get(dev);
5787 if (idev) {
5788 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5789 idev->cnf.disable_ipv6 = newf;
5790 if (changed)
5791 dev_disable_change(idev);
5792 }
5793 }
5794 }
5795
5796 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5797 {
5798 struct net *net;
5799 int old;
5800
5801 if (!rtnl_trylock())
5802 return restart_syscall();
5803
5804 net = (struct net *)table->extra2;
5805 old = *p;
5806 *p = newf;
5807
5808 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5809 rtnl_unlock();
5810 return 0;
5811 }
5812
5813 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5814 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5815 addrconf_disable_change(net, newf);
5816 } else if ((!newf) ^ (!old))
5817 dev_disable_change((struct inet6_dev *)table->extra1);
5818
5819 rtnl_unlock();
5820 return 0;
5821 }
5822
5823 static
5824 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5825 void __user *buffer, size_t *lenp, loff_t *ppos)
5826 {
5827 int *valp = ctl->data;
5828 int val = *valp;
5829 loff_t pos = *ppos;
5830 struct ctl_table lctl;
5831 int ret;
5832
5833 /*
5834 * ctl->data points to idev->cnf.disable_ipv6, we should
5835 * not modify it until we get the rtnl lock.
5836 */
5837 lctl = *ctl;
5838 lctl.data = &val;
5839
5840 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5841
5842 if (write)
5843 ret = addrconf_disable_ipv6(ctl, valp, val);
5844 if (ret)
5845 *ppos = pos;
5846 return ret;
5847 }
5848
5849 static
5850 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5851 void __user *buffer, size_t *lenp, loff_t *ppos)
5852 {
5853 int *valp = ctl->data;
5854 int ret;
5855 int old, new;
5856
5857 old = *valp;
5858 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5859 new = *valp;
5860
5861 if (write && old != new) {
5862 struct net *net = ctl->extra2;
5863
5864 if (!rtnl_trylock())
5865 return restart_syscall();
5866
5867 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5868 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5869 NETCONFA_PROXY_NEIGH,
5870 NETCONFA_IFINDEX_DEFAULT,
5871 net->ipv6.devconf_dflt);
5872 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5873 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5874 NETCONFA_PROXY_NEIGH,
5875 NETCONFA_IFINDEX_ALL,
5876 net->ipv6.devconf_all);
5877 else {
5878 struct inet6_dev *idev = ctl->extra1;
5879
5880 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5881 NETCONFA_PROXY_NEIGH,
5882 idev->dev->ifindex,
5883 &idev->cnf);
5884 }
5885 rtnl_unlock();
5886 }
5887
5888 return ret;
5889 }
5890
5891 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5892 void __user *buffer, size_t *lenp,
5893 loff_t *ppos)
5894 {
5895 int ret = 0;
5896 u32 new_val;
5897 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5898 struct net *net = (struct net *)ctl->extra2;
5899 struct ctl_table tmp = {
5900 .data = &new_val,
5901 .maxlen = sizeof(new_val),
5902 .mode = ctl->mode,
5903 };
5904
5905 if (!rtnl_trylock())
5906 return restart_syscall();
5907
5908 new_val = *((u32 *)ctl->data);
5909
5910 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
5911 if (ret != 0)
5912 goto out;
5913
5914 if (write) {
5915 if (check_addr_gen_mode(new_val) < 0) {
5916 ret = -EINVAL;
5917 goto out;
5918 }
5919
5920 if (idev) {
5921 if (check_stable_privacy(idev, net, new_val) < 0) {
5922 ret = -EINVAL;
5923 goto out;
5924 }
5925
5926 if (idev->cnf.addr_gen_mode != new_val) {
5927 idev->cnf.addr_gen_mode = new_val;
5928 addrconf_dev_config(idev->dev);
5929 }
5930 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
5931 struct net_device *dev;
5932
5933 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
5934 for_each_netdev(net, dev) {
5935 idev = __in6_dev_get(dev);
5936 if (idev &&
5937 idev->cnf.addr_gen_mode != new_val) {
5938 idev->cnf.addr_gen_mode = new_val;
5939 addrconf_dev_config(idev->dev);
5940 }
5941 }
5942 }
5943
5944 *((u32 *)ctl->data) = new_val;
5945 }
5946
5947 out:
5948 rtnl_unlock();
5949
5950 return ret;
5951 }
5952
5953 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5954 void __user *buffer, size_t *lenp,
5955 loff_t *ppos)
5956 {
5957 int err;
5958 struct in6_addr addr;
5959 char str[IPV6_MAX_STRLEN];
5960 struct ctl_table lctl = *ctl;
5961 struct net *net = ctl->extra2;
5962 struct ipv6_stable_secret *secret = ctl->data;
5963
5964 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5965 return -EIO;
5966
5967 lctl.maxlen = IPV6_MAX_STRLEN;
5968 lctl.data = str;
5969
5970 if (!rtnl_trylock())
5971 return restart_syscall();
5972
5973 if (!write && !secret->initialized) {
5974 err = -EIO;
5975 goto out;
5976 }
5977
5978 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5979 if (err >= sizeof(str)) {
5980 err = -EIO;
5981 goto out;
5982 }
5983
5984 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5985 if (err || !write)
5986 goto out;
5987
5988 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5989 err = -EIO;
5990 goto out;
5991 }
5992
5993 secret->initialized = true;
5994 secret->secret = addr;
5995
5996 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5997 struct net_device *dev;
5998
5999 for_each_netdev(net, dev) {
6000 struct inet6_dev *idev = __in6_dev_get(dev);
6001
6002 if (idev) {
6003 idev->cnf.addr_gen_mode =
6004 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6005 }
6006 }
6007 } else {
6008 struct inet6_dev *idev = ctl->extra1;
6009
6010 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6011 }
6012
6013 out:
6014 rtnl_unlock();
6015
6016 return err;
6017 }
6018
6019 static
6020 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6021 int write,
6022 void __user *buffer,
6023 size_t *lenp,
6024 loff_t *ppos)
6025 {
6026 int *valp = ctl->data;
6027 int val = *valp;
6028 loff_t pos = *ppos;
6029 struct ctl_table lctl;
6030 int ret;
6031
6032 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6033 * we should not modify it until we get the rtnl lock.
6034 */
6035 lctl = *ctl;
6036 lctl.data = &val;
6037
6038 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6039
6040 if (write)
6041 ret = addrconf_fixup_linkdown(ctl, valp, val);
6042 if (ret)
6043 *ppos = pos;
6044 return ret;
6045 }
6046
6047 static
6048 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6049 {
6050 if (rt) {
6051 if (action)
6052 rt->dst.flags |= DST_NOPOLICY;
6053 else
6054 rt->dst.flags &= ~DST_NOPOLICY;
6055 }
6056 }
6057
6058 static
6059 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6060 {
6061 struct inet6_ifaddr *ifa;
6062
6063 read_lock_bh(&idev->lock);
6064 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6065 spin_lock(&ifa->lock);
6066 if (ifa->rt) {
6067 struct fib6_info *rt = ifa->rt;
6068 int cpu;
6069
6070 rcu_read_lock();
6071 ifa->rt->dst_nopolicy = val ? true : false;
6072 if (rt->rt6i_pcpu) {
6073 for_each_possible_cpu(cpu) {
6074 struct rt6_info **rtp;
6075
6076 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
6077 addrconf_set_nopolicy(*rtp, val);
6078 }
6079 }
6080 rcu_read_unlock();
6081 }
6082 spin_unlock(&ifa->lock);
6083 }
6084 read_unlock_bh(&idev->lock);
6085 }
6086
6087 static
6088 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6089 {
6090 struct inet6_dev *idev;
6091 struct net *net;
6092
6093 if (!rtnl_trylock())
6094 return restart_syscall();
6095
6096 *valp = val;
6097
6098 net = (struct net *)ctl->extra2;
6099 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6100 rtnl_unlock();
6101 return 0;
6102 }
6103
6104 if (valp == &net->ipv6.devconf_all->disable_policy) {
6105 struct net_device *dev;
6106
6107 for_each_netdev(net, dev) {
6108 idev = __in6_dev_get(dev);
6109 if (idev)
6110 addrconf_disable_policy_idev(idev, val);
6111 }
6112 } else {
6113 idev = (struct inet6_dev *)ctl->extra1;
6114 addrconf_disable_policy_idev(idev, val);
6115 }
6116
6117 rtnl_unlock();
6118 return 0;
6119 }
6120
6121 static
6122 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6123 void __user *buffer, size_t *lenp,
6124 loff_t *ppos)
6125 {
6126 int *valp = ctl->data;
6127 int val = *valp;
6128 loff_t pos = *ppos;
6129 struct ctl_table lctl;
6130 int ret;
6131
6132 lctl = *ctl;
6133 lctl.data = &val;
6134 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6135
6136 if (write && (*valp != val))
6137 ret = addrconf_disable_policy(ctl, valp, val);
6138
6139 if (ret)
6140 *ppos = pos;
6141
6142 return ret;
6143 }
6144
6145 static int minus_one = -1;
6146 static const int zero = 0;
6147 static const int one = 1;
6148 static const int two_five_five = 255;
6149
6150 static const struct ctl_table addrconf_sysctl[] = {
6151 {
6152 .procname = "forwarding",
6153 .data = &ipv6_devconf.forwarding,
6154 .maxlen = sizeof(int),
6155 .mode = 0644,
6156 .proc_handler = addrconf_sysctl_forward,
6157 },
6158 {
6159 .procname = "hop_limit",
6160 .data = &ipv6_devconf.hop_limit,
6161 .maxlen = sizeof(int),
6162 .mode = 0644,
6163 .proc_handler = proc_dointvec_minmax,
6164 .extra1 = (void *)&one,
6165 .extra2 = (void *)&two_five_five,
6166 },
6167 {
6168 .procname = "mtu",
6169 .data = &ipv6_devconf.mtu6,
6170 .maxlen = sizeof(int),
6171 .mode = 0644,
6172 .proc_handler = addrconf_sysctl_mtu,
6173 },
6174 {
6175 .procname = "accept_ra",
6176 .data = &ipv6_devconf.accept_ra,
6177 .maxlen = sizeof(int),
6178 .mode = 0644,
6179 .proc_handler = proc_dointvec,
6180 },
6181 {
6182 .procname = "accept_redirects",
6183 .data = &ipv6_devconf.accept_redirects,
6184 .maxlen = sizeof(int),
6185 .mode = 0644,
6186 .proc_handler = proc_dointvec,
6187 },
6188 {
6189 .procname = "autoconf",
6190 .data = &ipv6_devconf.autoconf,
6191 .maxlen = sizeof(int),
6192 .mode = 0644,
6193 .proc_handler = proc_dointvec,
6194 },
6195 {
6196 .procname = "dad_transmits",
6197 .data = &ipv6_devconf.dad_transmits,
6198 .maxlen = sizeof(int),
6199 .mode = 0644,
6200 .proc_handler = proc_dointvec,
6201 },
6202 {
6203 .procname = "router_solicitations",
6204 .data = &ipv6_devconf.rtr_solicits,
6205 .maxlen = sizeof(int),
6206 .mode = 0644,
6207 .proc_handler = proc_dointvec_minmax,
6208 .extra1 = &minus_one,
6209 },
6210 {
6211 .procname = "router_solicitation_interval",
6212 .data = &ipv6_devconf.rtr_solicit_interval,
6213 .maxlen = sizeof(int),
6214 .mode = 0644,
6215 .proc_handler = proc_dointvec_jiffies,
6216 },
6217 {
6218 .procname = "router_solicitation_max_interval",
6219 .data = &ipv6_devconf.rtr_solicit_max_interval,
6220 .maxlen = sizeof(int),
6221 .mode = 0644,
6222 .proc_handler = proc_dointvec_jiffies,
6223 },
6224 {
6225 .procname = "router_solicitation_delay",
6226 .data = &ipv6_devconf.rtr_solicit_delay,
6227 .maxlen = sizeof(int),
6228 .mode = 0644,
6229 .proc_handler = proc_dointvec_jiffies,
6230 },
6231 {
6232 .procname = "force_mld_version",
6233 .data = &ipv6_devconf.force_mld_version,
6234 .maxlen = sizeof(int),
6235 .mode = 0644,
6236 .proc_handler = proc_dointvec,
6237 },
6238 {
6239 .procname = "mldv1_unsolicited_report_interval",
6240 .data =
6241 &ipv6_devconf.mldv1_unsolicited_report_interval,
6242 .maxlen = sizeof(int),
6243 .mode = 0644,
6244 .proc_handler = proc_dointvec_ms_jiffies,
6245 },
6246 {
6247 .procname = "mldv2_unsolicited_report_interval",
6248 .data =
6249 &ipv6_devconf.mldv2_unsolicited_report_interval,
6250 .maxlen = sizeof(int),
6251 .mode = 0644,
6252 .proc_handler = proc_dointvec_ms_jiffies,
6253 },
6254 {
6255 .procname = "use_tempaddr",
6256 .data = &ipv6_devconf.use_tempaddr,
6257 .maxlen = sizeof(int),
6258 .mode = 0644,
6259 .proc_handler = proc_dointvec,
6260 },
6261 {
6262 .procname = "temp_valid_lft",
6263 .data = &ipv6_devconf.temp_valid_lft,
6264 .maxlen = sizeof(int),
6265 .mode = 0644,
6266 .proc_handler = proc_dointvec,
6267 },
6268 {
6269 .procname = "temp_prefered_lft",
6270 .data = &ipv6_devconf.temp_prefered_lft,
6271 .maxlen = sizeof(int),
6272 .mode = 0644,
6273 .proc_handler = proc_dointvec,
6274 },
6275 {
6276 .procname = "regen_max_retry",
6277 .data = &ipv6_devconf.regen_max_retry,
6278 .maxlen = sizeof(int),
6279 .mode = 0644,
6280 .proc_handler = proc_dointvec,
6281 },
6282 {
6283 .procname = "max_desync_factor",
6284 .data = &ipv6_devconf.max_desync_factor,
6285 .maxlen = sizeof(int),
6286 .mode = 0644,
6287 .proc_handler = proc_dointvec,
6288 },
6289 {
6290 .procname = "max_addresses",
6291 .data = &ipv6_devconf.max_addresses,
6292 .maxlen = sizeof(int),
6293 .mode = 0644,
6294 .proc_handler = proc_dointvec,
6295 },
6296 {
6297 .procname = "accept_ra_defrtr",
6298 .data = &ipv6_devconf.accept_ra_defrtr,
6299 .maxlen = sizeof(int),
6300 .mode = 0644,
6301 .proc_handler = proc_dointvec,
6302 },
6303 {
6304 .procname = "accept_ra_min_hop_limit",
6305 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6306 .maxlen = sizeof(int),
6307 .mode = 0644,
6308 .proc_handler = proc_dointvec,
6309 },
6310 {
6311 .procname = "accept_ra_pinfo",
6312 .data = &ipv6_devconf.accept_ra_pinfo,
6313 .maxlen = sizeof(int),
6314 .mode = 0644,
6315 .proc_handler = proc_dointvec,
6316 },
6317 #ifdef CONFIG_IPV6_ROUTER_PREF
6318 {
6319 .procname = "accept_ra_rtr_pref",
6320 .data = &ipv6_devconf.accept_ra_rtr_pref,
6321 .maxlen = sizeof(int),
6322 .mode = 0644,
6323 .proc_handler = proc_dointvec,
6324 },
6325 {
6326 .procname = "router_probe_interval",
6327 .data = &ipv6_devconf.rtr_probe_interval,
6328 .maxlen = sizeof(int),
6329 .mode = 0644,
6330 .proc_handler = proc_dointvec_jiffies,
6331 },
6332 #ifdef CONFIG_IPV6_ROUTE_INFO
6333 {
6334 .procname = "accept_ra_rt_info_min_plen",
6335 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6336 .maxlen = sizeof(int),
6337 .mode = 0644,
6338 .proc_handler = proc_dointvec,
6339 },
6340 {
6341 .procname = "accept_ra_rt_info_max_plen",
6342 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6343 .maxlen = sizeof(int),
6344 .mode = 0644,
6345 .proc_handler = proc_dointvec,
6346 },
6347 #endif
6348 #endif
6349 {
6350 .procname = "proxy_ndp",
6351 .data = &ipv6_devconf.proxy_ndp,
6352 .maxlen = sizeof(int),
6353 .mode = 0644,
6354 .proc_handler = addrconf_sysctl_proxy_ndp,
6355 },
6356 {
6357 .procname = "accept_source_route",
6358 .data = &ipv6_devconf.accept_source_route,
6359 .maxlen = sizeof(int),
6360 .mode = 0644,
6361 .proc_handler = proc_dointvec,
6362 },
6363 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6364 {
6365 .procname = "optimistic_dad",
6366 .data = &ipv6_devconf.optimistic_dad,
6367 .maxlen = sizeof(int),
6368 .mode = 0644,
6369 .proc_handler = proc_dointvec,
6370 },
6371 {
6372 .procname = "use_optimistic",
6373 .data = &ipv6_devconf.use_optimistic,
6374 .maxlen = sizeof(int),
6375 .mode = 0644,
6376 .proc_handler = proc_dointvec,
6377 },
6378 #endif
6379 #ifdef CONFIG_IPV6_MROUTE
6380 {
6381 .procname = "mc_forwarding",
6382 .data = &ipv6_devconf.mc_forwarding,
6383 .maxlen = sizeof(int),
6384 .mode = 0444,
6385 .proc_handler = proc_dointvec,
6386 },
6387 #endif
6388 {
6389 .procname = "disable_ipv6",
6390 .data = &ipv6_devconf.disable_ipv6,
6391 .maxlen = sizeof(int),
6392 .mode = 0644,
6393 .proc_handler = addrconf_sysctl_disable,
6394 },
6395 {
6396 .procname = "accept_dad",
6397 .data = &ipv6_devconf.accept_dad,
6398 .maxlen = sizeof(int),
6399 .mode = 0644,
6400 .proc_handler = proc_dointvec,
6401 },
6402 {
6403 .procname = "force_tllao",
6404 .data = &ipv6_devconf.force_tllao,
6405 .maxlen = sizeof(int),
6406 .mode = 0644,
6407 .proc_handler = proc_dointvec
6408 },
6409 {
6410 .procname = "ndisc_notify",
6411 .data = &ipv6_devconf.ndisc_notify,
6412 .maxlen = sizeof(int),
6413 .mode = 0644,
6414 .proc_handler = proc_dointvec
6415 },
6416 {
6417 .procname = "suppress_frag_ndisc",
6418 .data = &ipv6_devconf.suppress_frag_ndisc,
6419 .maxlen = sizeof(int),
6420 .mode = 0644,
6421 .proc_handler = proc_dointvec
6422 },
6423 {
6424 .procname = "accept_ra_from_local",
6425 .data = &ipv6_devconf.accept_ra_from_local,
6426 .maxlen = sizeof(int),
6427 .mode = 0644,
6428 .proc_handler = proc_dointvec,
6429 },
6430 {
6431 .procname = "accept_ra_mtu",
6432 .data = &ipv6_devconf.accept_ra_mtu,
6433 .maxlen = sizeof(int),
6434 .mode = 0644,
6435 .proc_handler = proc_dointvec,
6436 },
6437 {
6438 .procname = "stable_secret",
6439 .data = &ipv6_devconf.stable_secret,
6440 .maxlen = IPV6_MAX_STRLEN,
6441 .mode = 0600,
6442 .proc_handler = addrconf_sysctl_stable_secret,
6443 },
6444 {
6445 .procname = "use_oif_addrs_only",
6446 .data = &ipv6_devconf.use_oif_addrs_only,
6447 .maxlen = sizeof(int),
6448 .mode = 0644,
6449 .proc_handler = proc_dointvec,
6450 },
6451 {
6452 .procname = "ignore_routes_with_linkdown",
6453 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6454 .maxlen = sizeof(int),
6455 .mode = 0644,
6456 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6457 },
6458 {
6459 .procname = "drop_unicast_in_l2_multicast",
6460 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6461 .maxlen = sizeof(int),
6462 .mode = 0644,
6463 .proc_handler = proc_dointvec,
6464 },
6465 {
6466 .procname = "drop_unsolicited_na",
6467 .data = &ipv6_devconf.drop_unsolicited_na,
6468 .maxlen = sizeof(int),
6469 .mode = 0644,
6470 .proc_handler = proc_dointvec,
6471 },
6472 {
6473 .procname = "keep_addr_on_down",
6474 .data = &ipv6_devconf.keep_addr_on_down,
6475 .maxlen = sizeof(int),
6476 .mode = 0644,
6477 .proc_handler = proc_dointvec,
6478
6479 },
6480 {
6481 .procname = "seg6_enabled",
6482 .data = &ipv6_devconf.seg6_enabled,
6483 .maxlen = sizeof(int),
6484 .mode = 0644,
6485 .proc_handler = proc_dointvec,
6486 },
6487 #ifdef CONFIG_IPV6_SEG6_HMAC
6488 {
6489 .procname = "seg6_require_hmac",
6490 .data = &ipv6_devconf.seg6_require_hmac,
6491 .maxlen = sizeof(int),
6492 .mode = 0644,
6493 .proc_handler = proc_dointvec,
6494 },
6495 #endif
6496 {
6497 .procname = "enhanced_dad",
6498 .data = &ipv6_devconf.enhanced_dad,
6499 .maxlen = sizeof(int),
6500 .mode = 0644,
6501 .proc_handler = proc_dointvec,
6502 },
6503 {
6504 .procname = "addr_gen_mode",
6505 .data = &ipv6_devconf.addr_gen_mode,
6506 .maxlen = sizeof(int),
6507 .mode = 0644,
6508 .proc_handler = addrconf_sysctl_addr_gen_mode,
6509 },
6510 {
6511 .procname = "disable_policy",
6512 .data = &ipv6_devconf.disable_policy,
6513 .maxlen = sizeof(int),
6514 .mode = 0644,
6515 .proc_handler = addrconf_sysctl_disable_policy,
6516 },
6517 {
6518 .procname = "ndisc_tclass",
6519 .data = &ipv6_devconf.ndisc_tclass,
6520 .maxlen = sizeof(int),
6521 .mode = 0644,
6522 .proc_handler = proc_dointvec_minmax,
6523 .extra1 = (void *)&zero,
6524 .extra2 = (void *)&two_five_five,
6525 },
6526 {
6527 /* sentinel */
6528 }
6529 };
6530
6531 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6532 struct inet6_dev *idev, struct ipv6_devconf *p)
6533 {
6534 int i, ifindex;
6535 struct ctl_table *table;
6536 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6537
6538 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6539 if (!table)
6540 goto out;
6541
6542 for (i = 0; table[i].data; i++) {
6543 table[i].data += (char *)p - (char *)&ipv6_devconf;
6544 /* If one of these is already set, then it is not safe to
6545 * overwrite either of them: this makes proc_dointvec_minmax
6546 * usable.
6547 */
6548 if (!table[i].extra1 && !table[i].extra2) {
6549 table[i].extra1 = idev; /* embedded; no ref */
6550 table[i].extra2 = net;
6551 }
6552 }
6553
6554 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6555
6556 p->sysctl_header = register_net_sysctl(net, path, table);
6557 if (!p->sysctl_header)
6558 goto free;
6559
6560 if (!strcmp(dev_name, "all"))
6561 ifindex = NETCONFA_IFINDEX_ALL;
6562 else if (!strcmp(dev_name, "default"))
6563 ifindex = NETCONFA_IFINDEX_DEFAULT;
6564 else
6565 ifindex = idev->dev->ifindex;
6566 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6567 ifindex, p);
6568 return 0;
6569
6570 free:
6571 kfree(table);
6572 out:
6573 return -ENOBUFS;
6574 }
6575
6576 static void __addrconf_sysctl_unregister(struct net *net,
6577 struct ipv6_devconf *p, int ifindex)
6578 {
6579 struct ctl_table *table;
6580
6581 if (!p->sysctl_header)
6582 return;
6583
6584 table = p->sysctl_header->ctl_table_arg;
6585 unregister_net_sysctl_table(p->sysctl_header);
6586 p->sysctl_header = NULL;
6587 kfree(table);
6588
6589 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6590 }
6591
6592 static int addrconf_sysctl_register(struct inet6_dev *idev)
6593 {
6594 int err;
6595
6596 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6597 return -EINVAL;
6598
6599 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6600 &ndisc_ifinfo_sysctl_change);
6601 if (err)
6602 return err;
6603 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6604 idev, &idev->cnf);
6605 if (err)
6606 neigh_sysctl_unregister(idev->nd_parms);
6607
6608 return err;
6609 }
6610
6611 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6612 {
6613 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6614 idev->dev->ifindex);
6615 neigh_sysctl_unregister(idev->nd_parms);
6616 }
6617
6618
6619 #endif
6620
6621 static int __net_init addrconf_init_net(struct net *net)
6622 {
6623 int err = -ENOMEM;
6624 struct ipv6_devconf *all, *dflt;
6625
6626 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6627 if (!all)
6628 goto err_alloc_all;
6629
6630 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6631 if (!dflt)
6632 goto err_alloc_dflt;
6633
6634 /* these will be inherited by all namespaces */
6635 dflt->autoconf = ipv6_defaults.autoconf;
6636 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6637
6638 dflt->stable_secret.initialized = false;
6639 all->stable_secret.initialized = false;
6640
6641 net->ipv6.devconf_all = all;
6642 net->ipv6.devconf_dflt = dflt;
6643
6644 #ifdef CONFIG_SYSCTL
6645 err = __addrconf_sysctl_register(net, "all", NULL, all);
6646 if (err < 0)
6647 goto err_reg_all;
6648
6649 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6650 if (err < 0)
6651 goto err_reg_dflt;
6652 #endif
6653 return 0;
6654
6655 #ifdef CONFIG_SYSCTL
6656 err_reg_dflt:
6657 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6658 err_reg_all:
6659 kfree(dflt);
6660 #endif
6661 err_alloc_dflt:
6662 kfree(all);
6663 err_alloc_all:
6664 return err;
6665 }
6666
6667 static void __net_exit addrconf_exit_net(struct net *net)
6668 {
6669 #ifdef CONFIG_SYSCTL
6670 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6671 NETCONFA_IFINDEX_DEFAULT);
6672 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6673 NETCONFA_IFINDEX_ALL);
6674 #endif
6675 kfree(net->ipv6.devconf_dflt);
6676 kfree(net->ipv6.devconf_all);
6677 }
6678
6679 static struct pernet_operations addrconf_ops = {
6680 .init = addrconf_init_net,
6681 .exit = addrconf_exit_net,
6682 };
6683
6684 static struct rtnl_af_ops inet6_ops __read_mostly = {
6685 .family = AF_INET6,
6686 .fill_link_af = inet6_fill_link_af,
6687 .get_link_af_size = inet6_get_link_af_size,
6688 .validate_link_af = inet6_validate_link_af,
6689 .set_link_af = inet6_set_link_af,
6690 };
6691
6692 /*
6693 * Init / cleanup code
6694 */
6695
6696 int __init addrconf_init(void)
6697 {
6698 struct inet6_dev *idev;
6699 int i, err;
6700
6701 err = ipv6_addr_label_init();
6702 if (err < 0) {
6703 pr_crit("%s: cannot initialize default policy table: %d\n",
6704 __func__, err);
6705 goto out;
6706 }
6707
6708 err = register_pernet_subsys(&addrconf_ops);
6709 if (err < 0)
6710 goto out_addrlabel;
6711
6712 addrconf_wq = create_workqueue("ipv6_addrconf");
6713 if (!addrconf_wq) {
6714 err = -ENOMEM;
6715 goto out_nowq;
6716 }
6717
6718 /* The addrconf netdev notifier requires that loopback_dev
6719 * has it's ipv6 private information allocated and setup
6720 * before it can bring up and give link-local addresses
6721 * to other devices which are up.
6722 *
6723 * Unfortunately, loopback_dev is not necessarily the first
6724 * entry in the global dev_base list of net devices. In fact,
6725 * it is likely to be the very last entry on that list.
6726 * So this causes the notifier registry below to try and
6727 * give link-local addresses to all devices besides loopback_dev
6728 * first, then loopback_dev, which cases all the non-loopback_dev
6729 * devices to fail to get a link-local address.
6730 *
6731 * So, as a temporary fix, allocate the ipv6 structure for
6732 * loopback_dev first by hand.
6733 * Longer term, all of the dependencies ipv6 has upon the loopback
6734 * device and it being up should be removed.
6735 */
6736 rtnl_lock();
6737 idev = ipv6_add_dev(init_net.loopback_dev);
6738 rtnl_unlock();
6739 if (IS_ERR(idev)) {
6740 err = PTR_ERR(idev);
6741 goto errlo;
6742 }
6743
6744 ip6_route_init_special_entries();
6745
6746 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6747 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6748
6749 register_netdevice_notifier(&ipv6_dev_notf);
6750
6751 addrconf_verify();
6752
6753 rtnl_af_register(&inet6_ops);
6754
6755 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
6756 NULL, inet6_dump_ifinfo, 0);
6757 if (err < 0)
6758 goto errout;
6759
6760 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
6761 inet6_rtm_newaddr, NULL, 0);
6762 if (err < 0)
6763 goto errout;
6764 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
6765 inet6_rtm_deladdr, NULL, 0);
6766 if (err < 0)
6767 goto errout;
6768 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
6769 inet6_rtm_getaddr, inet6_dump_ifaddr,
6770 RTNL_FLAG_DOIT_UNLOCKED);
6771 if (err < 0)
6772 goto errout;
6773 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
6774 NULL, inet6_dump_ifmcaddr, 0);
6775 if (err < 0)
6776 goto errout;
6777 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
6778 NULL, inet6_dump_ifacaddr, 0);
6779 if (err < 0)
6780 goto errout;
6781 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
6782 inet6_netconf_get_devconf,
6783 inet6_netconf_dump_devconf,
6784 RTNL_FLAG_DOIT_UNLOCKED);
6785 if (err < 0)
6786 goto errout;
6787 err = ipv6_addr_label_rtnl_register();
6788 if (err < 0)
6789 goto errout;
6790
6791 return 0;
6792 errout:
6793 rtnl_unregister_all(PF_INET6);
6794 rtnl_af_unregister(&inet6_ops);
6795 unregister_netdevice_notifier(&ipv6_dev_notf);
6796 errlo:
6797 destroy_workqueue(addrconf_wq);
6798 out_nowq:
6799 unregister_pernet_subsys(&addrconf_ops);
6800 out_addrlabel:
6801 ipv6_addr_label_cleanup();
6802 out:
6803 return err;
6804 }
6805
6806 void addrconf_cleanup(void)
6807 {
6808 struct net_device *dev;
6809 int i;
6810
6811 unregister_netdevice_notifier(&ipv6_dev_notf);
6812 unregister_pernet_subsys(&addrconf_ops);
6813 ipv6_addr_label_cleanup();
6814
6815 rtnl_af_unregister(&inet6_ops);
6816
6817 rtnl_lock();
6818
6819 /* clean dev list */
6820 for_each_netdev(&init_net, dev) {
6821 if (__in6_dev_get(dev) == NULL)
6822 continue;
6823 addrconf_ifdown(dev, 1);
6824 }
6825 addrconf_ifdown(init_net.loopback_dev, 2);
6826
6827 /*
6828 * Check hash table.
6829 */
6830 spin_lock_bh(&addrconf_hash_lock);
6831 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6832 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6833 spin_unlock_bh(&addrconf_hash_lock);
6834 cancel_delayed_work(&addr_chk_work);
6835 rtnl_unlock();
6836
6837 destroy_workqueue(addrconf_wq);
6838 }
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