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Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_addr.h>
53 #include <linux/if_arp.h>
54 #include <linux/if_arcnet.h>
55 #include <linux/if_infiniband.h>
56 #include <linux/route.h>
57 #include <linux/inetdevice.h>
58 #include <linux/init.h>
59 #include <linux/slab.h>
60 #ifdef CONFIG_SYSCTL
61 #include <linux/sysctl.h>
62 #endif
63 #include <linux/capability.h>
64 #include <linux/delay.h>
65 #include <linux/notifier.h>
66 #include <linux/string.h>
67 #include <linux/hash.h>
68
69 #include <net/net_namespace.h>
70 #include <net/sock.h>
71 #include <net/snmp.h>
72
73 #include <net/af_ieee802154.h>
74 #include <net/firewire.h>
75 #include <net/ipv6.h>
76 #include <net/protocol.h>
77 #include <net/ndisc.h>
78 #include <net/ip6_route.h>
79 #include <net/addrconf.h>
80 #include <net/tcp.h>
81 #include <net/ip.h>
82 #include <net/netlink.h>
83 #include <net/pkt_sched.h>
84 #include <net/l3mdev.h>
85 #include <linux/if_tunnel.h>
86 #include <linux/rtnetlink.h>
87 #include <linux/netconf.h>
88 #include <linux/random.h>
89 #include <linux/uaccess.h>
90 #include <asm/unaligned.h>
91
92 #include <linux/proc_fs.h>
93 #include <linux/seq_file.h>
94 #include <linux/export.h>
95
96 /* Set to 3 to get tracing... */
97 #define ACONF_DEBUG 2
98
99 #if ACONF_DEBUG >= 3
100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
101 #else
102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
103 #endif
104
105 #define INFINITY_LIFE_TIME 0xFFFFFFFF
106
107 #define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
110 static inline u32 cstamp_delta(unsigned long cstamp)
111 {
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113 }
114
115 #ifdef CONFIG_SYSCTL
116 static int addrconf_sysctl_register(struct inet6_dev *idev);
117 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118 #else
119 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
120 {
121 return 0;
122 }
123
124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125 {
126 }
127 #endif
128
129 static void __ipv6_regen_rndid(struct inet6_dev *idev);
130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
131 static void ipv6_regen_rndid(unsigned long data);
132
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
135 static int ipv6_generate_stable_address(struct in6_addr *addr,
136 u8 dad_count,
137 const struct inet6_dev *idev);
138
139 /*
140 * Configured unicast address hash table
141 */
142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
143 static DEFINE_SPINLOCK(addrconf_hash_lock);
144
145 static void addrconf_verify(void);
146 static void addrconf_verify_rtnl(void);
147 static void addrconf_verify_work(struct work_struct *);
148
149 static struct workqueue_struct *addrconf_wq;
150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
151
152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154
155 static void addrconf_type_change(struct net_device *dev,
156 unsigned long event);
157 static int addrconf_ifdown(struct net_device *dev, int how);
158
159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160 int plen,
161 const struct net_device *dev,
162 u32 flags, u32 noflags);
163
164 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
165 static void addrconf_dad_work(struct work_struct *w);
166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
167 static void addrconf_dad_run(struct inet6_dev *idev);
168 static void addrconf_rs_timer(unsigned long data);
169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171
172 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
173 struct prefix_info *pinfo);
174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175 struct net_device *dev);
176
177 static struct ipv6_devconf ipv6_devconf __read_mostly = {
178 .forwarding = 0,
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
181 .accept_ra = 1,
182 .accept_redirects = 1,
183 .autoconf = 1,
184 .force_mld_version = 0,
185 .mldv1_unsolicited_report_interval = 10 * HZ,
186 .mldv2_unsolicited_report_interval = HZ,
187 .dad_transmits = 1,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
191 .use_tempaddr = 0,
192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
196 .max_addresses = IPV6_MAX_ADDRESSES,
197 .accept_ra_defrtr = 1,
198 .accept_ra_from_local = 0,
199 .accept_ra_min_hop_limit= 1,
200 .accept_ra_pinfo = 1,
201 #ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
203 .rtr_probe_interval = 60 * HZ,
204 #ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
206 #endif
207 #endif
208 .proxy_ndp = 0,
209 .accept_source_route = 0, /* we do not accept RH0 by default. */
210 .disable_ipv6 = 0,
211 .accept_dad = 1,
212 .suppress_frag_ndisc = 1,
213 .accept_ra_mtu = 1,
214 .stable_secret = {
215 .initialized = false,
216 },
217 .use_oif_addrs_only = 0,
218 .ignore_routes_with_linkdown = 0,
219 };
220
221 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
222 .forwarding = 0,
223 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
224 .mtu6 = IPV6_MIN_MTU,
225 .accept_ra = 1,
226 .accept_redirects = 1,
227 .autoconf = 1,
228 .force_mld_version = 0,
229 .mldv1_unsolicited_report_interval = 10 * HZ,
230 .mldv2_unsolicited_report_interval = HZ,
231 .dad_transmits = 1,
232 .rtr_solicits = MAX_RTR_SOLICITATIONS,
233 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
234 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
235 .use_tempaddr = 0,
236 .temp_valid_lft = TEMP_VALID_LIFETIME,
237 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
238 .regen_max_retry = REGEN_MAX_RETRY,
239 .max_desync_factor = MAX_DESYNC_FACTOR,
240 .max_addresses = IPV6_MAX_ADDRESSES,
241 .accept_ra_defrtr = 1,
242 .accept_ra_from_local = 0,
243 .accept_ra_min_hop_limit= 1,
244 .accept_ra_pinfo = 1,
245 #ifdef CONFIG_IPV6_ROUTER_PREF
246 .accept_ra_rtr_pref = 1,
247 .rtr_probe_interval = 60 * HZ,
248 #ifdef CONFIG_IPV6_ROUTE_INFO
249 .accept_ra_rt_info_max_plen = 0,
250 #endif
251 #endif
252 .proxy_ndp = 0,
253 .accept_source_route = 0, /* we do not accept RH0 by default. */
254 .disable_ipv6 = 0,
255 .accept_dad = 1,
256 .suppress_frag_ndisc = 1,
257 .accept_ra_mtu = 1,
258 .stable_secret = {
259 .initialized = false,
260 },
261 .use_oif_addrs_only = 0,
262 .ignore_routes_with_linkdown = 0,
263 };
264
265 /* Check if a valid qdisc is available */
266 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
267 {
268 return !qdisc_tx_is_noop(dev);
269 }
270
271 static void addrconf_del_rs_timer(struct inet6_dev *idev)
272 {
273 if (del_timer(&idev->rs_timer))
274 __in6_dev_put(idev);
275 }
276
277 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
278 {
279 if (cancel_delayed_work(&ifp->dad_work))
280 __in6_ifa_put(ifp);
281 }
282
283 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
284 unsigned long when)
285 {
286 if (!timer_pending(&idev->rs_timer))
287 in6_dev_hold(idev);
288 mod_timer(&idev->rs_timer, jiffies + when);
289 }
290
291 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
292 unsigned long delay)
293 {
294 if (!delayed_work_pending(&ifp->dad_work))
295 in6_ifa_hold(ifp);
296 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
297 }
298
299 static int snmp6_alloc_dev(struct inet6_dev *idev)
300 {
301 int i;
302
303 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
304 if (!idev->stats.ipv6)
305 goto err_ip;
306
307 for_each_possible_cpu(i) {
308 struct ipstats_mib *addrconf_stats;
309 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
310 u64_stats_init(&addrconf_stats->syncp);
311 }
312
313
314 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
315 GFP_KERNEL);
316 if (!idev->stats.icmpv6dev)
317 goto err_icmp;
318 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
319 GFP_KERNEL);
320 if (!idev->stats.icmpv6msgdev)
321 goto err_icmpmsg;
322
323 return 0;
324
325 err_icmpmsg:
326 kfree(idev->stats.icmpv6dev);
327 err_icmp:
328 free_percpu(idev->stats.ipv6);
329 err_ip:
330 return -ENOMEM;
331 }
332
333 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
334 {
335 struct inet6_dev *ndev;
336 int err = -ENOMEM;
337
338 ASSERT_RTNL();
339
340 if (dev->mtu < IPV6_MIN_MTU)
341 return ERR_PTR(-EINVAL);
342
343 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
344 if (!ndev)
345 return ERR_PTR(err);
346
347 rwlock_init(&ndev->lock);
348 ndev->dev = dev;
349 INIT_LIST_HEAD(&ndev->addr_list);
350 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
351 (unsigned long)ndev);
352 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
353 ndev->cnf.mtu6 = dev->mtu;
354 ndev->cnf.sysctl = NULL;
355 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
356 if (!ndev->nd_parms) {
357 kfree(ndev);
358 return ERR_PTR(err);
359 }
360 if (ndev->cnf.forwarding)
361 dev_disable_lro(dev);
362 /* We refer to the device */
363 dev_hold(dev);
364
365 if (snmp6_alloc_dev(ndev) < 0) {
366 ADBG(KERN_WARNING
367 "%s: cannot allocate memory for statistics; dev=%s.\n",
368 __func__, dev->name);
369 neigh_parms_release(&nd_tbl, ndev->nd_parms);
370 dev_put(dev);
371 kfree(ndev);
372 return ERR_PTR(err);
373 }
374
375 if (snmp6_register_dev(ndev) < 0) {
376 ADBG(KERN_WARNING
377 "%s: cannot create /proc/net/dev_snmp6/%s\n",
378 __func__, dev->name);
379 goto err_release;
380 }
381
382 /* One reference from device. We must do this before
383 * we invoke __ipv6_regen_rndid().
384 */
385 in6_dev_hold(ndev);
386
387 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
388 ndev->cnf.accept_dad = -1;
389
390 #if IS_ENABLED(CONFIG_IPV6_SIT)
391 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
392 pr_info("%s: Disabled Multicast RS\n", dev->name);
393 ndev->cnf.rtr_solicits = 0;
394 }
395 #endif
396
397 INIT_LIST_HEAD(&ndev->tempaddr_list);
398 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
399 if ((dev->flags&IFF_LOOPBACK) ||
400 dev->type == ARPHRD_TUNNEL ||
401 dev->type == ARPHRD_TUNNEL6 ||
402 dev->type == ARPHRD_SIT ||
403 dev->type == ARPHRD_NONE) {
404 ndev->cnf.use_tempaddr = -1;
405 } else {
406 in6_dev_hold(ndev);
407 ipv6_regen_rndid((unsigned long) ndev);
408 }
409
410 ndev->token = in6addr_any;
411
412 if (netif_running(dev) && addrconf_qdisc_ok(dev))
413 ndev->if_flags |= IF_READY;
414
415 ipv6_mc_init_dev(ndev);
416 ndev->tstamp = jiffies;
417 err = addrconf_sysctl_register(ndev);
418 if (err) {
419 ipv6_mc_destroy_dev(ndev);
420 del_timer(&ndev->regen_timer);
421 snmp6_unregister_dev(ndev);
422 goto err_release;
423 }
424 /* protected by rtnl_lock */
425 rcu_assign_pointer(dev->ip6_ptr, ndev);
426
427 /* Join interface-local all-node multicast group */
428 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
429
430 /* Join all-node multicast group */
431 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
432
433 /* Join all-router multicast group if forwarding is set */
434 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
436
437 return ndev;
438
439 err_release:
440 neigh_parms_release(&nd_tbl, ndev->nd_parms);
441 ndev->dead = 1;
442 in6_dev_finish_destroy(ndev);
443 return ERR_PTR(err);
444 }
445
446 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
447 {
448 struct inet6_dev *idev;
449
450 ASSERT_RTNL();
451
452 idev = __in6_dev_get(dev);
453 if (!idev) {
454 idev = ipv6_add_dev(dev);
455 if (IS_ERR(idev))
456 return NULL;
457 }
458
459 if (dev->flags&IFF_UP)
460 ipv6_mc_up(idev);
461 return idev;
462 }
463
464 static int inet6_netconf_msgsize_devconf(int type)
465 {
466 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
467 + nla_total_size(4); /* NETCONFA_IFINDEX */
468
469 /* type -1 is used for ALL */
470 if (type == -1 || type == NETCONFA_FORWARDING)
471 size += nla_total_size(4);
472 #ifdef CONFIG_IPV6_MROUTE
473 if (type == -1 || type == NETCONFA_MC_FORWARDING)
474 size += nla_total_size(4);
475 #endif
476 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
477 size += nla_total_size(4);
478
479 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
480 size += nla_total_size(4);
481
482 return size;
483 }
484
485 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
486 struct ipv6_devconf *devconf, u32 portid,
487 u32 seq, int event, unsigned int flags,
488 int type)
489 {
490 struct nlmsghdr *nlh;
491 struct netconfmsg *ncm;
492
493 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
494 flags);
495 if (!nlh)
496 return -EMSGSIZE;
497
498 ncm = nlmsg_data(nlh);
499 ncm->ncm_family = AF_INET6;
500
501 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
502 goto nla_put_failure;
503
504 /* type -1 is used for ALL */
505 if ((type == -1 || type == NETCONFA_FORWARDING) &&
506 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
507 goto nla_put_failure;
508 #ifdef CONFIG_IPV6_MROUTE
509 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
510 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
511 devconf->mc_forwarding) < 0)
512 goto nla_put_failure;
513 #endif
514 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
515 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
516 goto nla_put_failure;
517
518 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
519 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
520 devconf->ignore_routes_with_linkdown) < 0)
521 goto nla_put_failure;
522
523 nlmsg_end(skb, nlh);
524 return 0;
525
526 nla_put_failure:
527 nlmsg_cancel(skb, nlh);
528 return -EMSGSIZE;
529 }
530
531 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
532 struct ipv6_devconf *devconf)
533 {
534 struct sk_buff *skb;
535 int err = -ENOBUFS;
536
537 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
538 if (!skb)
539 goto errout;
540
541 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
542 RTM_NEWNETCONF, 0, type);
543 if (err < 0) {
544 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
545 WARN_ON(err == -EMSGSIZE);
546 kfree_skb(skb);
547 goto errout;
548 }
549 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
550 return;
551 errout:
552 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
553 }
554
555 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
556 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
557 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
558 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
559 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
560 };
561
562 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
563 struct nlmsghdr *nlh)
564 {
565 struct net *net = sock_net(in_skb->sk);
566 struct nlattr *tb[NETCONFA_MAX+1];
567 struct netconfmsg *ncm;
568 struct sk_buff *skb;
569 struct ipv6_devconf *devconf;
570 struct inet6_dev *in6_dev;
571 struct net_device *dev;
572 int ifindex;
573 int err;
574
575 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
576 devconf_ipv6_policy);
577 if (err < 0)
578 goto errout;
579
580 err = EINVAL;
581 if (!tb[NETCONFA_IFINDEX])
582 goto errout;
583
584 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
585 switch (ifindex) {
586 case NETCONFA_IFINDEX_ALL:
587 devconf = net->ipv6.devconf_all;
588 break;
589 case NETCONFA_IFINDEX_DEFAULT:
590 devconf = net->ipv6.devconf_dflt;
591 break;
592 default:
593 dev = __dev_get_by_index(net, ifindex);
594 if (!dev)
595 goto errout;
596 in6_dev = __in6_dev_get(dev);
597 if (!in6_dev)
598 goto errout;
599 devconf = &in6_dev->cnf;
600 break;
601 }
602
603 err = -ENOBUFS;
604 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
605 if (!skb)
606 goto errout;
607
608 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
609 NETLINK_CB(in_skb).portid,
610 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
611 -1);
612 if (err < 0) {
613 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
614 WARN_ON(err == -EMSGSIZE);
615 kfree_skb(skb);
616 goto errout;
617 }
618 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
619 errout:
620 return err;
621 }
622
623 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
624 struct netlink_callback *cb)
625 {
626 struct net *net = sock_net(skb->sk);
627 int h, s_h;
628 int idx, s_idx;
629 struct net_device *dev;
630 struct inet6_dev *idev;
631 struct hlist_head *head;
632
633 s_h = cb->args[0];
634 s_idx = idx = cb->args[1];
635
636 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
637 idx = 0;
638 head = &net->dev_index_head[h];
639 rcu_read_lock();
640 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
641 net->dev_base_seq;
642 hlist_for_each_entry_rcu(dev, head, index_hlist) {
643 if (idx < s_idx)
644 goto cont;
645 idev = __in6_dev_get(dev);
646 if (!idev)
647 goto cont;
648
649 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
650 &idev->cnf,
651 NETLINK_CB(cb->skb).portid,
652 cb->nlh->nlmsg_seq,
653 RTM_NEWNETCONF,
654 NLM_F_MULTI,
655 -1) < 0) {
656 rcu_read_unlock();
657 goto done;
658 }
659 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
660 cont:
661 idx++;
662 }
663 rcu_read_unlock();
664 }
665 if (h == NETDEV_HASHENTRIES) {
666 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
667 net->ipv6.devconf_all,
668 NETLINK_CB(cb->skb).portid,
669 cb->nlh->nlmsg_seq,
670 RTM_NEWNETCONF, NLM_F_MULTI,
671 -1) < 0)
672 goto done;
673 else
674 h++;
675 }
676 if (h == NETDEV_HASHENTRIES + 1) {
677 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
678 net->ipv6.devconf_dflt,
679 NETLINK_CB(cb->skb).portid,
680 cb->nlh->nlmsg_seq,
681 RTM_NEWNETCONF, NLM_F_MULTI,
682 -1) < 0)
683 goto done;
684 else
685 h++;
686 }
687 done:
688 cb->args[0] = h;
689 cb->args[1] = idx;
690
691 return skb->len;
692 }
693
694 #ifdef CONFIG_SYSCTL
695 static void dev_forward_change(struct inet6_dev *idev)
696 {
697 struct net_device *dev;
698 struct inet6_ifaddr *ifa;
699
700 if (!idev)
701 return;
702 dev = idev->dev;
703 if (idev->cnf.forwarding)
704 dev_disable_lro(dev);
705 if (dev->flags & IFF_MULTICAST) {
706 if (idev->cnf.forwarding) {
707 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
708 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
709 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
710 } else {
711 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
712 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
713 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
714 }
715 }
716
717 list_for_each_entry(ifa, &idev->addr_list, if_list) {
718 if (ifa->flags&IFA_F_TENTATIVE)
719 continue;
720 if (idev->cnf.forwarding)
721 addrconf_join_anycast(ifa);
722 else
723 addrconf_leave_anycast(ifa);
724 }
725 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
726 dev->ifindex, &idev->cnf);
727 }
728
729
730 static void addrconf_forward_change(struct net *net, __s32 newf)
731 {
732 struct net_device *dev;
733 struct inet6_dev *idev;
734
735 for_each_netdev(net, dev) {
736 idev = __in6_dev_get(dev);
737 if (idev) {
738 int changed = (!idev->cnf.forwarding) ^ (!newf);
739 idev->cnf.forwarding = newf;
740 if (changed)
741 dev_forward_change(idev);
742 }
743 }
744 }
745
746 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
747 {
748 struct net *net;
749 int old;
750
751 if (!rtnl_trylock())
752 return restart_syscall();
753
754 net = (struct net *)table->extra2;
755 old = *p;
756 *p = newf;
757
758 if (p == &net->ipv6.devconf_dflt->forwarding) {
759 if ((!newf) ^ (!old))
760 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
761 NETCONFA_IFINDEX_DEFAULT,
762 net->ipv6.devconf_dflt);
763 rtnl_unlock();
764 return 0;
765 }
766
767 if (p == &net->ipv6.devconf_all->forwarding) {
768 net->ipv6.devconf_dflt->forwarding = newf;
769 addrconf_forward_change(net, newf);
770 if ((!newf) ^ (!old))
771 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
772 NETCONFA_IFINDEX_ALL,
773 net->ipv6.devconf_all);
774 } else if ((!newf) ^ (!old))
775 dev_forward_change((struct inet6_dev *)table->extra1);
776 rtnl_unlock();
777
778 if (newf)
779 rt6_purge_dflt_routers(net);
780 return 1;
781 }
782
783 static void addrconf_linkdown_change(struct net *net, __s32 newf)
784 {
785 struct net_device *dev;
786 struct inet6_dev *idev;
787
788 for_each_netdev(net, dev) {
789 idev = __in6_dev_get(dev);
790 if (idev) {
791 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
792
793 idev->cnf.ignore_routes_with_linkdown = newf;
794 if (changed)
795 inet6_netconf_notify_devconf(dev_net(dev),
796 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
797 dev->ifindex,
798 &idev->cnf);
799 }
800 }
801 }
802
803 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
804 {
805 struct net *net;
806 int old;
807
808 if (!rtnl_trylock())
809 return restart_syscall();
810
811 net = (struct net *)table->extra2;
812 old = *p;
813 *p = newf;
814
815 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
816 if ((!newf) ^ (!old))
817 inet6_netconf_notify_devconf(net,
818 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
819 NETCONFA_IFINDEX_DEFAULT,
820 net->ipv6.devconf_dflt);
821 rtnl_unlock();
822 return 0;
823 }
824
825 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
826 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
827 addrconf_linkdown_change(net, newf);
828 if ((!newf) ^ (!old))
829 inet6_netconf_notify_devconf(net,
830 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
831 NETCONFA_IFINDEX_ALL,
832 net->ipv6.devconf_all);
833 }
834 rtnl_unlock();
835
836 return 1;
837 }
838
839 #endif
840
841 /* Nobody refers to this ifaddr, destroy it */
842 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
843 {
844 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
845
846 #ifdef NET_REFCNT_DEBUG
847 pr_debug("%s\n", __func__);
848 #endif
849
850 in6_dev_put(ifp->idev);
851
852 if (cancel_delayed_work(&ifp->dad_work))
853 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
854 ifp);
855
856 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
857 pr_warn("Freeing alive inet6 address %p\n", ifp);
858 return;
859 }
860 ip6_rt_put(ifp->rt);
861
862 kfree_rcu(ifp, rcu);
863 }
864
865 static void
866 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
867 {
868 struct list_head *p;
869 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
870
871 /*
872 * Each device address list is sorted in order of scope -
873 * global before linklocal.
874 */
875 list_for_each(p, &idev->addr_list) {
876 struct inet6_ifaddr *ifa
877 = list_entry(p, struct inet6_ifaddr, if_list);
878 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
879 break;
880 }
881
882 list_add_tail(&ifp->if_list, p);
883 }
884
885 static u32 inet6_addr_hash(const struct in6_addr *addr)
886 {
887 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
888 }
889
890 /* On success it returns ifp with increased reference count */
891
892 static struct inet6_ifaddr *
893 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
894 const struct in6_addr *peer_addr, int pfxlen,
895 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
896 {
897 struct inet6_ifaddr *ifa = NULL;
898 struct rt6_info *rt;
899 unsigned int hash;
900 int err = 0;
901 int addr_type = ipv6_addr_type(addr);
902
903 if (addr_type == IPV6_ADDR_ANY ||
904 addr_type & IPV6_ADDR_MULTICAST ||
905 (!(idev->dev->flags & IFF_LOOPBACK) &&
906 addr_type & IPV6_ADDR_LOOPBACK))
907 return ERR_PTR(-EADDRNOTAVAIL);
908
909 rcu_read_lock_bh();
910 if (idev->dead) {
911 err = -ENODEV; /*XXX*/
912 goto out2;
913 }
914
915 if (idev->cnf.disable_ipv6) {
916 err = -EACCES;
917 goto out2;
918 }
919
920 spin_lock(&addrconf_hash_lock);
921
922 /* Ignore adding duplicate addresses on an interface */
923 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
924 ADBG("ipv6_add_addr: already assigned\n");
925 err = -EEXIST;
926 goto out;
927 }
928
929 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
930
931 if (!ifa) {
932 ADBG("ipv6_add_addr: malloc failed\n");
933 err = -ENOBUFS;
934 goto out;
935 }
936
937 rt = addrconf_dst_alloc(idev, addr, false);
938 if (IS_ERR(rt)) {
939 err = PTR_ERR(rt);
940 goto out;
941 }
942
943 neigh_parms_data_state_setall(idev->nd_parms);
944
945 ifa->addr = *addr;
946 if (peer_addr)
947 ifa->peer_addr = *peer_addr;
948
949 spin_lock_init(&ifa->lock);
950 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
951 INIT_HLIST_NODE(&ifa->addr_lst);
952 ifa->scope = scope;
953 ifa->prefix_len = pfxlen;
954 ifa->flags = flags | IFA_F_TENTATIVE;
955 ifa->valid_lft = valid_lft;
956 ifa->prefered_lft = prefered_lft;
957 ifa->cstamp = ifa->tstamp = jiffies;
958 ifa->tokenized = false;
959
960 ifa->rt = rt;
961
962 ifa->idev = idev;
963 in6_dev_hold(idev);
964 /* For caller */
965 in6_ifa_hold(ifa);
966
967 /* Add to big hash table */
968 hash = inet6_addr_hash(addr);
969
970 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
971 spin_unlock(&addrconf_hash_lock);
972
973 write_lock(&idev->lock);
974 /* Add to inet6_dev unicast addr list. */
975 ipv6_link_dev_addr(idev, ifa);
976
977 if (ifa->flags&IFA_F_TEMPORARY) {
978 list_add(&ifa->tmp_list, &idev->tempaddr_list);
979 in6_ifa_hold(ifa);
980 }
981
982 in6_ifa_hold(ifa);
983 write_unlock(&idev->lock);
984 out2:
985 rcu_read_unlock_bh();
986
987 if (likely(err == 0))
988 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
989 else {
990 kfree(ifa);
991 ifa = ERR_PTR(err);
992 }
993
994 return ifa;
995 out:
996 spin_unlock(&addrconf_hash_lock);
997 goto out2;
998 }
999
1000 enum cleanup_prefix_rt_t {
1001 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1002 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1003 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1004 };
1005
1006 /*
1007 * Check, whether the prefix for ifp would still need a prefix route
1008 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1009 * constants.
1010 *
1011 * 1) we don't purge prefix if address was not permanent.
1012 * prefix is managed by its own lifetime.
1013 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1014 * 3) if there are no addresses, delete prefix.
1015 * 4) if there are still other permanent address(es),
1016 * corresponding prefix is still permanent.
1017 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1018 * don't purge the prefix, assume user space is managing it.
1019 * 6) otherwise, update prefix lifetime to the
1020 * longest valid lifetime among the corresponding
1021 * addresses on the device.
1022 * Note: subsequent RA will update lifetime.
1023 **/
1024 static enum cleanup_prefix_rt_t
1025 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1026 {
1027 struct inet6_ifaddr *ifa;
1028 struct inet6_dev *idev = ifp->idev;
1029 unsigned long lifetime;
1030 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1031
1032 *expires = jiffies;
1033
1034 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1035 if (ifa == ifp)
1036 continue;
1037 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1038 ifp->prefix_len))
1039 continue;
1040 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1041 return CLEANUP_PREFIX_RT_NOP;
1042
1043 action = CLEANUP_PREFIX_RT_EXPIRE;
1044
1045 spin_lock(&ifa->lock);
1046
1047 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1048 /*
1049 * Note: Because this address is
1050 * not permanent, lifetime <
1051 * LONG_MAX / HZ here.
1052 */
1053 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1054 *expires = ifa->tstamp + lifetime * HZ;
1055 spin_unlock(&ifa->lock);
1056 }
1057
1058 return action;
1059 }
1060
1061 static void
1062 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1063 {
1064 struct rt6_info *rt;
1065
1066 rt = addrconf_get_prefix_route(&ifp->addr,
1067 ifp->prefix_len,
1068 ifp->idev->dev,
1069 0, RTF_GATEWAY | RTF_DEFAULT);
1070 if (rt) {
1071 if (del_rt)
1072 ip6_del_rt(rt);
1073 else {
1074 if (!(rt->rt6i_flags & RTF_EXPIRES))
1075 rt6_set_expires(rt, expires);
1076 ip6_rt_put(rt);
1077 }
1078 }
1079 }
1080
1081
1082 /* This function wants to get referenced ifp and releases it before return */
1083
1084 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1085 {
1086 int state;
1087 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1088 unsigned long expires;
1089
1090 ASSERT_RTNL();
1091
1092 spin_lock_bh(&ifp->lock);
1093 state = ifp->state;
1094 ifp->state = INET6_IFADDR_STATE_DEAD;
1095 spin_unlock_bh(&ifp->lock);
1096
1097 if (state == INET6_IFADDR_STATE_DEAD)
1098 goto out;
1099
1100 spin_lock_bh(&addrconf_hash_lock);
1101 hlist_del_init_rcu(&ifp->addr_lst);
1102 spin_unlock_bh(&addrconf_hash_lock);
1103
1104 write_lock_bh(&ifp->idev->lock);
1105
1106 if (ifp->flags&IFA_F_TEMPORARY) {
1107 list_del(&ifp->tmp_list);
1108 if (ifp->ifpub) {
1109 in6_ifa_put(ifp->ifpub);
1110 ifp->ifpub = NULL;
1111 }
1112 __in6_ifa_put(ifp);
1113 }
1114
1115 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1116 action = check_cleanup_prefix_route(ifp, &expires);
1117
1118 list_del_init(&ifp->if_list);
1119 __in6_ifa_put(ifp);
1120
1121 write_unlock_bh(&ifp->idev->lock);
1122
1123 addrconf_del_dad_work(ifp);
1124
1125 ipv6_ifa_notify(RTM_DELADDR, ifp);
1126
1127 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1128
1129 if (action != CLEANUP_PREFIX_RT_NOP) {
1130 cleanup_prefix_route(ifp, expires,
1131 action == CLEANUP_PREFIX_RT_DEL);
1132 }
1133
1134 /* clean up prefsrc entries */
1135 rt6_remove_prefsrc(ifp);
1136 out:
1137 in6_ifa_put(ifp);
1138 }
1139
1140 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1141 {
1142 struct inet6_dev *idev = ifp->idev;
1143 struct in6_addr addr, *tmpaddr;
1144 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1145 unsigned long regen_advance;
1146 int tmp_plen;
1147 int ret = 0;
1148 u32 addr_flags;
1149 unsigned long now = jiffies;
1150
1151 write_lock_bh(&idev->lock);
1152 if (ift) {
1153 spin_lock_bh(&ift->lock);
1154 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1155 spin_unlock_bh(&ift->lock);
1156 tmpaddr = &addr;
1157 } else {
1158 tmpaddr = NULL;
1159 }
1160 retry:
1161 in6_dev_hold(idev);
1162 if (idev->cnf.use_tempaddr <= 0) {
1163 write_unlock_bh(&idev->lock);
1164 pr_info("%s: use_tempaddr is disabled\n", __func__);
1165 in6_dev_put(idev);
1166 ret = -1;
1167 goto out;
1168 }
1169 spin_lock_bh(&ifp->lock);
1170 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1171 idev->cnf.use_tempaddr = -1; /*XXX*/
1172 spin_unlock_bh(&ifp->lock);
1173 write_unlock_bh(&idev->lock);
1174 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1175 __func__);
1176 in6_dev_put(idev);
1177 ret = -1;
1178 goto out;
1179 }
1180 in6_ifa_hold(ifp);
1181 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1182 __ipv6_try_regen_rndid(idev, tmpaddr);
1183 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1184 age = (now - ifp->tstamp) / HZ;
1185 tmp_valid_lft = min_t(__u32,
1186 ifp->valid_lft,
1187 idev->cnf.temp_valid_lft + age);
1188 tmp_prefered_lft = min_t(__u32,
1189 ifp->prefered_lft,
1190 idev->cnf.temp_prefered_lft + age -
1191 idev->cnf.max_desync_factor);
1192 tmp_plen = ifp->prefix_len;
1193 tmp_tstamp = ifp->tstamp;
1194 spin_unlock_bh(&ifp->lock);
1195
1196 regen_advance = idev->cnf.regen_max_retry *
1197 idev->cnf.dad_transmits *
1198 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1199 write_unlock_bh(&idev->lock);
1200
1201 /* A temporary address is created only if this calculated Preferred
1202 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1203 * an implementation must not create a temporary address with a zero
1204 * Preferred Lifetime.
1205 * Use age calculation as in addrconf_verify to avoid unnecessary
1206 * temporary addresses being generated.
1207 */
1208 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1209 if (tmp_prefered_lft <= regen_advance + age) {
1210 in6_ifa_put(ifp);
1211 in6_dev_put(idev);
1212 ret = -1;
1213 goto out;
1214 }
1215
1216 addr_flags = IFA_F_TEMPORARY;
1217 /* set in addrconf_prefix_rcv() */
1218 if (ifp->flags & IFA_F_OPTIMISTIC)
1219 addr_flags |= IFA_F_OPTIMISTIC;
1220
1221 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1222 ipv6_addr_scope(&addr), addr_flags,
1223 tmp_valid_lft, tmp_prefered_lft);
1224 if (IS_ERR(ift)) {
1225 in6_ifa_put(ifp);
1226 in6_dev_put(idev);
1227 pr_info("%s: retry temporary address regeneration\n", __func__);
1228 tmpaddr = &addr;
1229 write_lock_bh(&idev->lock);
1230 goto retry;
1231 }
1232
1233 spin_lock_bh(&ift->lock);
1234 ift->ifpub = ifp;
1235 ift->cstamp = now;
1236 ift->tstamp = tmp_tstamp;
1237 spin_unlock_bh(&ift->lock);
1238
1239 addrconf_dad_start(ift);
1240 in6_ifa_put(ift);
1241 in6_dev_put(idev);
1242 out:
1243 return ret;
1244 }
1245
1246 /*
1247 * Choose an appropriate source address (RFC3484)
1248 */
1249 enum {
1250 IPV6_SADDR_RULE_INIT = 0,
1251 IPV6_SADDR_RULE_LOCAL,
1252 IPV6_SADDR_RULE_SCOPE,
1253 IPV6_SADDR_RULE_PREFERRED,
1254 #ifdef CONFIG_IPV6_MIP6
1255 IPV6_SADDR_RULE_HOA,
1256 #endif
1257 IPV6_SADDR_RULE_OIF,
1258 IPV6_SADDR_RULE_LABEL,
1259 IPV6_SADDR_RULE_PRIVACY,
1260 IPV6_SADDR_RULE_ORCHID,
1261 IPV6_SADDR_RULE_PREFIX,
1262 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1263 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1264 #endif
1265 IPV6_SADDR_RULE_MAX
1266 };
1267
1268 struct ipv6_saddr_score {
1269 int rule;
1270 int addr_type;
1271 struct inet6_ifaddr *ifa;
1272 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1273 int scopedist;
1274 int matchlen;
1275 };
1276
1277 struct ipv6_saddr_dst {
1278 const struct in6_addr *addr;
1279 int ifindex;
1280 int scope;
1281 int label;
1282 unsigned int prefs;
1283 };
1284
1285 static inline int ipv6_saddr_preferred(int type)
1286 {
1287 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1288 return 1;
1289 return 0;
1290 }
1291
1292 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1293 {
1294 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1295 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1296 #else
1297 return false;
1298 #endif
1299 }
1300
1301 static int ipv6_get_saddr_eval(struct net *net,
1302 struct ipv6_saddr_score *score,
1303 struct ipv6_saddr_dst *dst,
1304 int i)
1305 {
1306 int ret;
1307
1308 if (i <= score->rule) {
1309 switch (i) {
1310 case IPV6_SADDR_RULE_SCOPE:
1311 ret = score->scopedist;
1312 break;
1313 case IPV6_SADDR_RULE_PREFIX:
1314 ret = score->matchlen;
1315 break;
1316 default:
1317 ret = !!test_bit(i, score->scorebits);
1318 }
1319 goto out;
1320 }
1321
1322 switch (i) {
1323 case IPV6_SADDR_RULE_INIT:
1324 /* Rule 0: remember if hiscore is not ready yet */
1325 ret = !!score->ifa;
1326 break;
1327 case IPV6_SADDR_RULE_LOCAL:
1328 /* Rule 1: Prefer same address */
1329 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1330 break;
1331 case IPV6_SADDR_RULE_SCOPE:
1332 /* Rule 2: Prefer appropriate scope
1333 *
1334 * ret
1335 * ^
1336 * -1 | d 15
1337 * ---+--+-+---> scope
1338 * |
1339 * | d is scope of the destination.
1340 * B-d | \
1341 * | \ <- smaller scope is better if
1342 * B-15 | \ if scope is enough for destination.
1343 * | ret = B - scope (-1 <= scope >= d <= 15).
1344 * d-C-1 | /
1345 * |/ <- greater is better
1346 * -C / if scope is not enough for destination.
1347 * /| ret = scope - C (-1 <= d < scope <= 15).
1348 *
1349 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1350 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1351 * Assume B = 0 and we get C > 29.
1352 */
1353 ret = __ipv6_addr_src_scope(score->addr_type);
1354 if (ret >= dst->scope)
1355 ret = -ret;
1356 else
1357 ret -= 128; /* 30 is enough */
1358 score->scopedist = ret;
1359 break;
1360 case IPV6_SADDR_RULE_PREFERRED:
1361 {
1362 /* Rule 3: Avoid deprecated and optimistic addresses */
1363 u8 avoid = IFA_F_DEPRECATED;
1364
1365 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1366 avoid |= IFA_F_OPTIMISTIC;
1367 ret = ipv6_saddr_preferred(score->addr_type) ||
1368 !(score->ifa->flags & avoid);
1369 break;
1370 }
1371 #ifdef CONFIG_IPV6_MIP6
1372 case IPV6_SADDR_RULE_HOA:
1373 {
1374 /* Rule 4: Prefer home address */
1375 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1376 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1377 break;
1378 }
1379 #endif
1380 case IPV6_SADDR_RULE_OIF:
1381 /* Rule 5: Prefer outgoing interface */
1382 ret = (!dst->ifindex ||
1383 dst->ifindex == score->ifa->idev->dev->ifindex);
1384 break;
1385 case IPV6_SADDR_RULE_LABEL:
1386 /* Rule 6: Prefer matching label */
1387 ret = ipv6_addr_label(net,
1388 &score->ifa->addr, score->addr_type,
1389 score->ifa->idev->dev->ifindex) == dst->label;
1390 break;
1391 case IPV6_SADDR_RULE_PRIVACY:
1392 {
1393 /* Rule 7: Prefer public address
1394 * Note: prefer temporary address if use_tempaddr >= 2
1395 */
1396 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1397 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1398 score->ifa->idev->cnf.use_tempaddr >= 2;
1399 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1400 break;
1401 }
1402 case IPV6_SADDR_RULE_ORCHID:
1403 /* Rule 8-: Prefer ORCHID vs ORCHID or
1404 * non-ORCHID vs non-ORCHID
1405 */
1406 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1407 ipv6_addr_orchid(dst->addr));
1408 break;
1409 case IPV6_SADDR_RULE_PREFIX:
1410 /* Rule 8: Use longest matching prefix */
1411 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1412 if (ret > score->ifa->prefix_len)
1413 ret = score->ifa->prefix_len;
1414 score->matchlen = ret;
1415 break;
1416 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1417 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1418 /* Optimistic addresses still have lower precedence than other
1419 * preferred addresses.
1420 */
1421 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1422 break;
1423 #endif
1424 default:
1425 ret = 0;
1426 }
1427
1428 if (ret)
1429 __set_bit(i, score->scorebits);
1430 score->rule = i;
1431 out:
1432 return ret;
1433 }
1434
1435 static int __ipv6_dev_get_saddr(struct net *net,
1436 struct ipv6_saddr_dst *dst,
1437 struct inet6_dev *idev,
1438 struct ipv6_saddr_score *scores,
1439 int hiscore_idx)
1440 {
1441 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1442
1443 read_lock_bh(&idev->lock);
1444 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1445 int i;
1446
1447 /*
1448 * - Tentative Address (RFC2462 section 5.4)
1449 * - A tentative address is not considered
1450 * "assigned to an interface" in the traditional
1451 * sense, unless it is also flagged as optimistic.
1452 * - Candidate Source Address (section 4)
1453 * - In any case, anycast addresses, multicast
1454 * addresses, and the unspecified address MUST
1455 * NOT be included in a candidate set.
1456 */
1457 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1458 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1459 continue;
1460
1461 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1462
1463 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1464 score->addr_type & IPV6_ADDR_MULTICAST)) {
1465 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1466 idev->dev->name);
1467 continue;
1468 }
1469
1470 score->rule = -1;
1471 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1472
1473 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1474 int minihiscore, miniscore;
1475
1476 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1477 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1478
1479 if (minihiscore > miniscore) {
1480 if (i == IPV6_SADDR_RULE_SCOPE &&
1481 score->scopedist > 0) {
1482 /*
1483 * special case:
1484 * each remaining entry
1485 * has too small (not enough)
1486 * scope, because ifa entries
1487 * are sorted by their scope
1488 * values.
1489 */
1490 goto out;
1491 }
1492 break;
1493 } else if (minihiscore < miniscore) {
1494 if (hiscore->ifa)
1495 in6_ifa_put(hiscore->ifa);
1496
1497 in6_ifa_hold(score->ifa);
1498
1499 swap(hiscore, score);
1500 hiscore_idx = 1 - hiscore_idx;
1501
1502 /* restore our iterator */
1503 score->ifa = hiscore->ifa;
1504
1505 break;
1506 }
1507 }
1508 }
1509 out:
1510 read_unlock_bh(&idev->lock);
1511 return hiscore_idx;
1512 }
1513
1514 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1515 const struct in6_addr *daddr, unsigned int prefs,
1516 struct in6_addr *saddr)
1517 {
1518 struct ipv6_saddr_score scores[2], *hiscore;
1519 struct ipv6_saddr_dst dst;
1520 struct inet6_dev *idev;
1521 struct net_device *dev;
1522 int dst_type;
1523 bool use_oif_addr = false;
1524 int hiscore_idx = 0;
1525
1526 dst_type = __ipv6_addr_type(daddr);
1527 dst.addr = daddr;
1528 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1529 dst.scope = __ipv6_addr_src_scope(dst_type);
1530 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1531 dst.prefs = prefs;
1532
1533 scores[hiscore_idx].rule = -1;
1534 scores[hiscore_idx].ifa = NULL;
1535
1536 rcu_read_lock();
1537
1538 /* Candidate Source Address (section 4)
1539 * - multicast and link-local destination address,
1540 * the set of candidate source address MUST only
1541 * include addresses assigned to interfaces
1542 * belonging to the same link as the outgoing
1543 * interface.
1544 * (- For site-local destination addresses, the
1545 * set of candidate source addresses MUST only
1546 * include addresses assigned to interfaces
1547 * belonging to the same site as the outgoing
1548 * interface.)
1549 * - "It is RECOMMENDED that the candidate source addresses
1550 * be the set of unicast addresses assigned to the
1551 * interface that will be used to send to the destination
1552 * (the 'outgoing' interface)." (RFC 6724)
1553 */
1554 if (dst_dev) {
1555 idev = __in6_dev_get(dst_dev);
1556 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1557 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1558 (idev && idev->cnf.use_oif_addrs_only)) {
1559 use_oif_addr = true;
1560 }
1561 }
1562
1563 if (use_oif_addr) {
1564 if (idev)
1565 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1566 } else {
1567 for_each_netdev_rcu(net, dev) {
1568 idev = __in6_dev_get(dev);
1569 if (!idev)
1570 continue;
1571 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1572 }
1573 }
1574 rcu_read_unlock();
1575
1576 hiscore = &scores[hiscore_idx];
1577 if (!hiscore->ifa)
1578 return -EADDRNOTAVAIL;
1579
1580 *saddr = hiscore->ifa->addr;
1581 in6_ifa_put(hiscore->ifa);
1582 return 0;
1583 }
1584 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1585
1586 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1587 u32 banned_flags)
1588 {
1589 struct inet6_ifaddr *ifp;
1590 int err = -EADDRNOTAVAIL;
1591
1592 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1593 if (ifp->scope > IFA_LINK)
1594 break;
1595 if (ifp->scope == IFA_LINK &&
1596 !(ifp->flags & banned_flags)) {
1597 *addr = ifp->addr;
1598 err = 0;
1599 break;
1600 }
1601 }
1602 return err;
1603 }
1604
1605 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1606 u32 banned_flags)
1607 {
1608 struct inet6_dev *idev;
1609 int err = -EADDRNOTAVAIL;
1610
1611 rcu_read_lock();
1612 idev = __in6_dev_get(dev);
1613 if (idev) {
1614 read_lock_bh(&idev->lock);
1615 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1616 read_unlock_bh(&idev->lock);
1617 }
1618 rcu_read_unlock();
1619 return err;
1620 }
1621
1622 static int ipv6_count_addresses(struct inet6_dev *idev)
1623 {
1624 int cnt = 0;
1625 struct inet6_ifaddr *ifp;
1626
1627 read_lock_bh(&idev->lock);
1628 list_for_each_entry(ifp, &idev->addr_list, if_list)
1629 cnt++;
1630 read_unlock_bh(&idev->lock);
1631 return cnt;
1632 }
1633
1634 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1635 const struct net_device *dev, int strict)
1636 {
1637 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1638 }
1639 EXPORT_SYMBOL(ipv6_chk_addr);
1640
1641 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1642 const struct net_device *dev, int strict,
1643 u32 banned_flags)
1644 {
1645 struct inet6_ifaddr *ifp;
1646 unsigned int hash = inet6_addr_hash(addr);
1647 u32 ifp_flags;
1648
1649 rcu_read_lock_bh();
1650 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1651 if (!net_eq(dev_net(ifp->idev->dev), net))
1652 continue;
1653 /* Decouple optimistic from tentative for evaluation here.
1654 * Ban optimistic addresses explicitly, when required.
1655 */
1656 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1657 ? (ifp->flags&~IFA_F_TENTATIVE)
1658 : ifp->flags;
1659 if (ipv6_addr_equal(&ifp->addr, addr) &&
1660 !(ifp_flags&banned_flags) &&
1661 (!dev || ifp->idev->dev == dev ||
1662 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1663 rcu_read_unlock_bh();
1664 return 1;
1665 }
1666 }
1667
1668 rcu_read_unlock_bh();
1669 return 0;
1670 }
1671 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1672
1673 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1674 struct net_device *dev)
1675 {
1676 unsigned int hash = inet6_addr_hash(addr);
1677 struct inet6_ifaddr *ifp;
1678
1679 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1680 if (!net_eq(dev_net(ifp->idev->dev), net))
1681 continue;
1682 if (ipv6_addr_equal(&ifp->addr, addr)) {
1683 if (!dev || ifp->idev->dev == dev)
1684 return true;
1685 }
1686 }
1687 return false;
1688 }
1689
1690 /* Compares an address/prefix_len with addresses on device @dev.
1691 * If one is found it returns true.
1692 */
1693 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1694 const unsigned int prefix_len, struct net_device *dev)
1695 {
1696 struct inet6_dev *idev;
1697 struct inet6_ifaddr *ifa;
1698 bool ret = false;
1699
1700 rcu_read_lock();
1701 idev = __in6_dev_get(dev);
1702 if (idev) {
1703 read_lock_bh(&idev->lock);
1704 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1705 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1706 if (ret)
1707 break;
1708 }
1709 read_unlock_bh(&idev->lock);
1710 }
1711 rcu_read_unlock();
1712
1713 return ret;
1714 }
1715 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1716
1717 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1718 {
1719 struct inet6_dev *idev;
1720 struct inet6_ifaddr *ifa;
1721 int onlink;
1722
1723 onlink = 0;
1724 rcu_read_lock();
1725 idev = __in6_dev_get(dev);
1726 if (idev) {
1727 read_lock_bh(&idev->lock);
1728 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1729 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1730 ifa->prefix_len);
1731 if (onlink)
1732 break;
1733 }
1734 read_unlock_bh(&idev->lock);
1735 }
1736 rcu_read_unlock();
1737 return onlink;
1738 }
1739 EXPORT_SYMBOL(ipv6_chk_prefix);
1740
1741 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1742 struct net_device *dev, int strict)
1743 {
1744 struct inet6_ifaddr *ifp, *result = NULL;
1745 unsigned int hash = inet6_addr_hash(addr);
1746
1747 rcu_read_lock_bh();
1748 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1749 if (!net_eq(dev_net(ifp->idev->dev), net))
1750 continue;
1751 if (ipv6_addr_equal(&ifp->addr, addr)) {
1752 if (!dev || ifp->idev->dev == dev ||
1753 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1754 result = ifp;
1755 in6_ifa_hold(ifp);
1756 break;
1757 }
1758 }
1759 }
1760 rcu_read_unlock_bh();
1761
1762 return result;
1763 }
1764
1765 /* Gets referenced address, destroys ifaddr */
1766
1767 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1768 {
1769 if (ifp->flags&IFA_F_PERMANENT) {
1770 spin_lock_bh(&ifp->lock);
1771 addrconf_del_dad_work(ifp);
1772 ifp->flags |= IFA_F_TENTATIVE;
1773 if (dad_failed)
1774 ifp->flags |= IFA_F_DADFAILED;
1775 spin_unlock_bh(&ifp->lock);
1776 if (dad_failed)
1777 ipv6_ifa_notify(0, ifp);
1778 in6_ifa_put(ifp);
1779 } else if (ifp->flags&IFA_F_TEMPORARY) {
1780 struct inet6_ifaddr *ifpub;
1781 spin_lock_bh(&ifp->lock);
1782 ifpub = ifp->ifpub;
1783 if (ifpub) {
1784 in6_ifa_hold(ifpub);
1785 spin_unlock_bh(&ifp->lock);
1786 ipv6_create_tempaddr(ifpub, ifp);
1787 in6_ifa_put(ifpub);
1788 } else {
1789 spin_unlock_bh(&ifp->lock);
1790 }
1791 ipv6_del_addr(ifp);
1792 } else {
1793 ipv6_del_addr(ifp);
1794 }
1795 }
1796
1797 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1798 {
1799 int err = -ENOENT;
1800
1801 spin_lock_bh(&ifp->lock);
1802 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1803 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1804 err = 0;
1805 }
1806 spin_unlock_bh(&ifp->lock);
1807
1808 return err;
1809 }
1810
1811 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1812 {
1813 struct in6_addr addr;
1814 struct inet6_dev *idev = ifp->idev;
1815 struct net *net = dev_net(ifp->idev->dev);
1816
1817 if (addrconf_dad_end(ifp)) {
1818 in6_ifa_put(ifp);
1819 return;
1820 }
1821
1822 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1823 ifp->idev->dev->name, &ifp->addr);
1824
1825 spin_lock_bh(&ifp->lock);
1826
1827 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1828 int scope = ifp->scope;
1829 u32 flags = ifp->flags;
1830 struct in6_addr new_addr;
1831 struct inet6_ifaddr *ifp2;
1832 u32 valid_lft, preferred_lft;
1833 int pfxlen = ifp->prefix_len;
1834 int retries = ifp->stable_privacy_retry + 1;
1835
1836 if (retries > net->ipv6.sysctl.idgen_retries) {
1837 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1838 ifp->idev->dev->name);
1839 goto errdad;
1840 }
1841
1842 new_addr = ifp->addr;
1843 if (ipv6_generate_stable_address(&new_addr, retries,
1844 idev))
1845 goto errdad;
1846
1847 valid_lft = ifp->valid_lft;
1848 preferred_lft = ifp->prefered_lft;
1849
1850 spin_unlock_bh(&ifp->lock);
1851
1852 if (idev->cnf.max_addresses &&
1853 ipv6_count_addresses(idev) >=
1854 idev->cnf.max_addresses)
1855 goto lock_errdad;
1856
1857 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1858 ifp->idev->dev->name);
1859
1860 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1861 scope, flags, valid_lft,
1862 preferred_lft);
1863 if (IS_ERR(ifp2))
1864 goto lock_errdad;
1865
1866 spin_lock_bh(&ifp2->lock);
1867 ifp2->stable_privacy_retry = retries;
1868 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1869 spin_unlock_bh(&ifp2->lock);
1870
1871 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1872 in6_ifa_put(ifp2);
1873 lock_errdad:
1874 spin_lock_bh(&ifp->lock);
1875 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1876 addr.s6_addr32[0] = htonl(0xfe800000);
1877 addr.s6_addr32[1] = 0;
1878
1879 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1880 ipv6_addr_equal(&ifp->addr, &addr)) {
1881 /* DAD failed for link-local based on MAC address */
1882 idev->cnf.disable_ipv6 = 1;
1883
1884 pr_info("%s: IPv6 being disabled!\n",
1885 ifp->idev->dev->name);
1886 }
1887 }
1888
1889 errdad:
1890 /* transition from _POSTDAD to _ERRDAD */
1891 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1892 spin_unlock_bh(&ifp->lock);
1893
1894 addrconf_mod_dad_work(ifp, 0);
1895 }
1896
1897 /* Join to solicited addr multicast group.
1898 * caller must hold RTNL */
1899 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1900 {
1901 struct in6_addr maddr;
1902
1903 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1904 return;
1905
1906 addrconf_addr_solict_mult(addr, &maddr);
1907 ipv6_dev_mc_inc(dev, &maddr);
1908 }
1909
1910 /* caller must hold RTNL */
1911 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1912 {
1913 struct in6_addr maddr;
1914
1915 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1916 return;
1917
1918 addrconf_addr_solict_mult(addr, &maddr);
1919 __ipv6_dev_mc_dec(idev, &maddr);
1920 }
1921
1922 /* caller must hold RTNL */
1923 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1924 {
1925 struct in6_addr addr;
1926
1927 if (ifp->prefix_len >= 127) /* RFC 6164 */
1928 return;
1929 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1930 if (ipv6_addr_any(&addr))
1931 return;
1932 __ipv6_dev_ac_inc(ifp->idev, &addr);
1933 }
1934
1935 /* caller must hold RTNL */
1936 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1937 {
1938 struct in6_addr addr;
1939
1940 if (ifp->prefix_len >= 127) /* RFC 6164 */
1941 return;
1942 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1943 if (ipv6_addr_any(&addr))
1944 return;
1945 __ipv6_dev_ac_dec(ifp->idev, &addr);
1946 }
1947
1948 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1949 {
1950 if (dev->addr_len != IEEE802154_ADDR_LEN)
1951 return -1;
1952 memcpy(eui, dev->dev_addr, 8);
1953 eui[0] ^= 2;
1954 return 0;
1955 }
1956
1957 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1958 {
1959 union fwnet_hwaddr *ha;
1960
1961 if (dev->addr_len != FWNET_ALEN)
1962 return -1;
1963
1964 ha = (union fwnet_hwaddr *)dev->dev_addr;
1965
1966 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1967 eui[0] ^= 2;
1968 return 0;
1969 }
1970
1971 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1972 {
1973 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1974 if (dev->addr_len != ARCNET_ALEN)
1975 return -1;
1976 memset(eui, 0, 7);
1977 eui[7] = *(u8 *)dev->dev_addr;
1978 return 0;
1979 }
1980
1981 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1982 {
1983 if (dev->addr_len != INFINIBAND_ALEN)
1984 return -1;
1985 memcpy(eui, dev->dev_addr + 12, 8);
1986 eui[0] |= 2;
1987 return 0;
1988 }
1989
1990 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1991 {
1992 if (addr == 0)
1993 return -1;
1994 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1995 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1996 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1997 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1998 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1999 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2000 eui[1] = 0;
2001 eui[2] = 0x5E;
2002 eui[3] = 0xFE;
2003 memcpy(eui + 4, &addr, 4);
2004 return 0;
2005 }
2006
2007 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2008 {
2009 if (dev->priv_flags & IFF_ISATAP)
2010 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2011 return -1;
2012 }
2013
2014 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2015 {
2016 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2017 }
2018
2019 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2020 {
2021 memcpy(eui, dev->perm_addr, 3);
2022 memcpy(eui + 5, dev->perm_addr + 3, 3);
2023 eui[3] = 0xFF;
2024 eui[4] = 0xFE;
2025 eui[0] ^= 2;
2026 return 0;
2027 }
2028
2029 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2030 {
2031 switch (dev->type) {
2032 case ARPHRD_ETHER:
2033 case ARPHRD_FDDI:
2034 return addrconf_ifid_eui48(eui, dev);
2035 case ARPHRD_ARCNET:
2036 return addrconf_ifid_arcnet(eui, dev);
2037 case ARPHRD_INFINIBAND:
2038 return addrconf_ifid_infiniband(eui, dev);
2039 case ARPHRD_SIT:
2040 return addrconf_ifid_sit(eui, dev);
2041 case ARPHRD_IPGRE:
2042 return addrconf_ifid_gre(eui, dev);
2043 case ARPHRD_6LOWPAN:
2044 case ARPHRD_IEEE802154:
2045 return addrconf_ifid_eui64(eui, dev);
2046 case ARPHRD_IEEE1394:
2047 return addrconf_ifid_ieee1394(eui, dev);
2048 case ARPHRD_TUNNEL6:
2049 return addrconf_ifid_ip6tnl(eui, dev);
2050 }
2051 return -1;
2052 }
2053
2054 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2055 {
2056 int err = -1;
2057 struct inet6_ifaddr *ifp;
2058
2059 read_lock_bh(&idev->lock);
2060 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2061 if (ifp->scope > IFA_LINK)
2062 break;
2063 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2064 memcpy(eui, ifp->addr.s6_addr+8, 8);
2065 err = 0;
2066 break;
2067 }
2068 }
2069 read_unlock_bh(&idev->lock);
2070 return err;
2071 }
2072
2073 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2074 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2075 {
2076 regen:
2077 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2078 idev->rndid[0] &= ~0x02;
2079
2080 /*
2081 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2082 * check if generated address is not inappropriate
2083 *
2084 * - Reserved subnet anycast (RFC 2526)
2085 * 11111101 11....11 1xxxxxxx
2086 * - ISATAP (RFC4214) 6.1
2087 * 00-00-5E-FE-xx-xx-xx-xx
2088 * - value 0
2089 * - XXX: already assigned to an address on the device
2090 */
2091 if (idev->rndid[0] == 0xfd &&
2092 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2093 (idev->rndid[7]&0x80))
2094 goto regen;
2095 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2096 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2097 goto regen;
2098 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2099 goto regen;
2100 }
2101 }
2102
2103 static void ipv6_regen_rndid(unsigned long data)
2104 {
2105 struct inet6_dev *idev = (struct inet6_dev *) data;
2106 unsigned long expires;
2107
2108 rcu_read_lock_bh();
2109 write_lock_bh(&idev->lock);
2110
2111 if (idev->dead)
2112 goto out;
2113
2114 __ipv6_regen_rndid(idev);
2115
2116 expires = jiffies +
2117 idev->cnf.temp_prefered_lft * HZ -
2118 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2119 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2120 idev->cnf.max_desync_factor * HZ;
2121 if (time_before(expires, jiffies)) {
2122 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2123 __func__, idev->dev->name);
2124 goto out;
2125 }
2126
2127 if (!mod_timer(&idev->regen_timer, expires))
2128 in6_dev_hold(idev);
2129
2130 out:
2131 write_unlock_bh(&idev->lock);
2132 rcu_read_unlock_bh();
2133 in6_dev_put(idev);
2134 }
2135
2136 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2137 {
2138 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2139 __ipv6_regen_rndid(idev);
2140 }
2141
2142 /*
2143 * Add prefix route.
2144 */
2145
2146 static void
2147 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2148 unsigned long expires, u32 flags)
2149 {
2150 struct fib6_config cfg = {
2151 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2152 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2153 .fc_ifindex = dev->ifindex,
2154 .fc_expires = expires,
2155 .fc_dst_len = plen,
2156 .fc_flags = RTF_UP | flags,
2157 .fc_nlinfo.nl_net = dev_net(dev),
2158 .fc_protocol = RTPROT_KERNEL,
2159 };
2160
2161 cfg.fc_dst = *pfx;
2162
2163 /* Prevent useless cloning on PtP SIT.
2164 This thing is done here expecting that the whole
2165 class of non-broadcast devices need not cloning.
2166 */
2167 #if IS_ENABLED(CONFIG_IPV6_SIT)
2168 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2169 cfg.fc_flags |= RTF_NONEXTHOP;
2170 #endif
2171
2172 ip6_route_add(&cfg);
2173 }
2174
2175
2176 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2177 int plen,
2178 const struct net_device *dev,
2179 u32 flags, u32 noflags)
2180 {
2181 struct fib6_node *fn;
2182 struct rt6_info *rt = NULL;
2183 struct fib6_table *table;
2184 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2185
2186 table = fib6_get_table(dev_net(dev), tb_id);
2187 if (!table)
2188 return NULL;
2189
2190 read_lock_bh(&table->tb6_lock);
2191 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2192 if (!fn)
2193 goto out;
2194
2195 noflags |= RTF_CACHE;
2196 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2197 if (rt->dst.dev->ifindex != dev->ifindex)
2198 continue;
2199 if ((rt->rt6i_flags & flags) != flags)
2200 continue;
2201 if ((rt->rt6i_flags & noflags) != 0)
2202 continue;
2203 dst_hold(&rt->dst);
2204 break;
2205 }
2206 out:
2207 read_unlock_bh(&table->tb6_lock);
2208 return rt;
2209 }
2210
2211
2212 /* Create "default" multicast route to the interface */
2213
2214 static void addrconf_add_mroute(struct net_device *dev)
2215 {
2216 struct fib6_config cfg = {
2217 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2218 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2219 .fc_ifindex = dev->ifindex,
2220 .fc_dst_len = 8,
2221 .fc_flags = RTF_UP,
2222 .fc_nlinfo.nl_net = dev_net(dev),
2223 };
2224
2225 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2226
2227 ip6_route_add(&cfg);
2228 }
2229
2230 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2231 {
2232 struct inet6_dev *idev;
2233
2234 ASSERT_RTNL();
2235
2236 idev = ipv6_find_idev(dev);
2237 if (!idev)
2238 return ERR_PTR(-ENOBUFS);
2239
2240 if (idev->cnf.disable_ipv6)
2241 return ERR_PTR(-EACCES);
2242
2243 /* Add default multicast route */
2244 if (!(dev->flags & IFF_LOOPBACK))
2245 addrconf_add_mroute(dev);
2246
2247 return idev;
2248 }
2249
2250 static void manage_tempaddrs(struct inet6_dev *idev,
2251 struct inet6_ifaddr *ifp,
2252 __u32 valid_lft, __u32 prefered_lft,
2253 bool create, unsigned long now)
2254 {
2255 u32 flags;
2256 struct inet6_ifaddr *ift;
2257
2258 read_lock_bh(&idev->lock);
2259 /* update all temporary addresses in the list */
2260 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2261 int age, max_valid, max_prefered;
2262
2263 if (ifp != ift->ifpub)
2264 continue;
2265
2266 /* RFC 4941 section 3.3:
2267 * If a received option will extend the lifetime of a public
2268 * address, the lifetimes of temporary addresses should
2269 * be extended, subject to the overall constraint that no
2270 * temporary addresses should ever remain "valid" or "preferred"
2271 * for a time longer than (TEMP_VALID_LIFETIME) or
2272 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2273 */
2274 age = (now - ift->cstamp) / HZ;
2275 max_valid = idev->cnf.temp_valid_lft - age;
2276 if (max_valid < 0)
2277 max_valid = 0;
2278
2279 max_prefered = idev->cnf.temp_prefered_lft -
2280 idev->cnf.max_desync_factor - age;
2281 if (max_prefered < 0)
2282 max_prefered = 0;
2283
2284 if (valid_lft > max_valid)
2285 valid_lft = max_valid;
2286
2287 if (prefered_lft > max_prefered)
2288 prefered_lft = max_prefered;
2289
2290 spin_lock(&ift->lock);
2291 flags = ift->flags;
2292 ift->valid_lft = valid_lft;
2293 ift->prefered_lft = prefered_lft;
2294 ift->tstamp = now;
2295 if (prefered_lft > 0)
2296 ift->flags &= ~IFA_F_DEPRECATED;
2297
2298 spin_unlock(&ift->lock);
2299 if (!(flags&IFA_F_TENTATIVE))
2300 ipv6_ifa_notify(0, ift);
2301 }
2302
2303 if ((create || list_empty(&idev->tempaddr_list)) &&
2304 idev->cnf.use_tempaddr > 0) {
2305 /* When a new public address is created as described
2306 * in [ADDRCONF], also create a new temporary address.
2307 * Also create a temporary address if it's enabled but
2308 * no temporary address currently exists.
2309 */
2310 read_unlock_bh(&idev->lock);
2311 ipv6_create_tempaddr(ifp, NULL);
2312 } else {
2313 read_unlock_bh(&idev->lock);
2314 }
2315 }
2316
2317 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2318 {
2319 struct prefix_info *pinfo;
2320 __u32 valid_lft;
2321 __u32 prefered_lft;
2322 int addr_type;
2323 u32 addr_flags = 0;
2324 struct inet6_dev *in6_dev;
2325 struct net *net = dev_net(dev);
2326
2327 pinfo = (struct prefix_info *) opt;
2328
2329 if (len < sizeof(struct prefix_info)) {
2330 ADBG("addrconf: prefix option too short\n");
2331 return;
2332 }
2333
2334 /*
2335 * Validation checks ([ADDRCONF], page 19)
2336 */
2337
2338 addr_type = ipv6_addr_type(&pinfo->prefix);
2339
2340 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2341 return;
2342
2343 valid_lft = ntohl(pinfo->valid);
2344 prefered_lft = ntohl(pinfo->prefered);
2345
2346 if (prefered_lft > valid_lft) {
2347 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2348 return;
2349 }
2350
2351 in6_dev = in6_dev_get(dev);
2352
2353 if (!in6_dev) {
2354 net_dbg_ratelimited("addrconf: device %s not configured\n",
2355 dev->name);
2356 return;
2357 }
2358
2359 /*
2360 * Two things going on here:
2361 * 1) Add routes for on-link prefixes
2362 * 2) Configure prefixes with the auto flag set
2363 */
2364
2365 if (pinfo->onlink) {
2366 struct rt6_info *rt;
2367 unsigned long rt_expires;
2368
2369 /* Avoid arithmetic overflow. Really, we could
2370 * save rt_expires in seconds, likely valid_lft,
2371 * but it would require division in fib gc, that it
2372 * not good.
2373 */
2374 if (HZ > USER_HZ)
2375 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2376 else
2377 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2378
2379 if (addrconf_finite_timeout(rt_expires))
2380 rt_expires *= HZ;
2381
2382 rt = addrconf_get_prefix_route(&pinfo->prefix,
2383 pinfo->prefix_len,
2384 dev,
2385 RTF_ADDRCONF | RTF_PREFIX_RT,
2386 RTF_GATEWAY | RTF_DEFAULT);
2387
2388 if (rt) {
2389 /* Autoconf prefix route */
2390 if (valid_lft == 0) {
2391 ip6_del_rt(rt);
2392 rt = NULL;
2393 } else if (addrconf_finite_timeout(rt_expires)) {
2394 /* not infinity */
2395 rt6_set_expires(rt, jiffies + rt_expires);
2396 } else {
2397 rt6_clean_expires(rt);
2398 }
2399 } else if (valid_lft) {
2400 clock_t expires = 0;
2401 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2402 if (addrconf_finite_timeout(rt_expires)) {
2403 /* not infinity */
2404 flags |= RTF_EXPIRES;
2405 expires = jiffies_to_clock_t(rt_expires);
2406 }
2407 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2408 dev, expires, flags);
2409 }
2410 ip6_rt_put(rt);
2411 }
2412
2413 /* Try to figure out our local address for this prefix */
2414
2415 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2416 struct inet6_ifaddr *ifp;
2417 struct in6_addr addr;
2418 int create = 0, update_lft = 0;
2419 bool tokenized = false;
2420
2421 if (pinfo->prefix_len == 64) {
2422 memcpy(&addr, &pinfo->prefix, 8);
2423
2424 if (!ipv6_addr_any(&in6_dev->token)) {
2425 read_lock_bh(&in6_dev->lock);
2426 memcpy(addr.s6_addr + 8,
2427 in6_dev->token.s6_addr + 8, 8);
2428 read_unlock_bh(&in6_dev->lock);
2429 tokenized = true;
2430 } else if (in6_dev->addr_gen_mode ==
2431 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2432 !ipv6_generate_stable_address(&addr, 0,
2433 in6_dev)) {
2434 addr_flags |= IFA_F_STABLE_PRIVACY;
2435 goto ok;
2436 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2437 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2438 in6_dev_put(in6_dev);
2439 return;
2440 }
2441 goto ok;
2442 }
2443 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2444 pinfo->prefix_len);
2445 in6_dev_put(in6_dev);
2446 return;
2447
2448 ok:
2449
2450 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2451
2452 if (!ifp && valid_lft) {
2453 int max_addresses = in6_dev->cnf.max_addresses;
2454
2455 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2456 if (in6_dev->cnf.optimistic_dad &&
2457 !net->ipv6.devconf_all->forwarding && sllao)
2458 addr_flags = IFA_F_OPTIMISTIC;
2459 #endif
2460
2461 /* Do not allow to create too much of autoconfigured
2462 * addresses; this would be too easy way to crash kernel.
2463 */
2464 if (!max_addresses ||
2465 ipv6_count_addresses(in6_dev) < max_addresses)
2466 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2467 pinfo->prefix_len,
2468 addr_type&IPV6_ADDR_SCOPE_MASK,
2469 addr_flags, valid_lft,
2470 prefered_lft);
2471
2472 if (IS_ERR_OR_NULL(ifp)) {
2473 in6_dev_put(in6_dev);
2474 return;
2475 }
2476
2477 update_lft = 0;
2478 create = 1;
2479 spin_lock_bh(&ifp->lock);
2480 ifp->flags |= IFA_F_MANAGETEMPADDR;
2481 ifp->cstamp = jiffies;
2482 ifp->tokenized = tokenized;
2483 spin_unlock_bh(&ifp->lock);
2484 addrconf_dad_start(ifp);
2485 }
2486
2487 if (ifp) {
2488 u32 flags;
2489 unsigned long now;
2490 u32 stored_lft;
2491
2492 /* update lifetime (RFC2462 5.5.3 e) */
2493 spin_lock_bh(&ifp->lock);
2494 now = jiffies;
2495 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2496 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2497 else
2498 stored_lft = 0;
2499 if (!update_lft && !create && stored_lft) {
2500 const u32 minimum_lft = min_t(u32,
2501 stored_lft, MIN_VALID_LIFETIME);
2502 valid_lft = max(valid_lft, minimum_lft);
2503
2504 /* RFC4862 Section 5.5.3e:
2505 * "Note that the preferred lifetime of the
2506 * corresponding address is always reset to
2507 * the Preferred Lifetime in the received
2508 * Prefix Information option, regardless of
2509 * whether the valid lifetime is also reset or
2510 * ignored."
2511 *
2512 * So we should always update prefered_lft here.
2513 */
2514 update_lft = 1;
2515 }
2516
2517 if (update_lft) {
2518 ifp->valid_lft = valid_lft;
2519 ifp->prefered_lft = prefered_lft;
2520 ifp->tstamp = now;
2521 flags = ifp->flags;
2522 ifp->flags &= ~IFA_F_DEPRECATED;
2523 spin_unlock_bh(&ifp->lock);
2524
2525 if (!(flags&IFA_F_TENTATIVE))
2526 ipv6_ifa_notify(0, ifp);
2527 } else
2528 spin_unlock_bh(&ifp->lock);
2529
2530 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2531 create, now);
2532
2533 in6_ifa_put(ifp);
2534 addrconf_verify();
2535 }
2536 }
2537 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2538 in6_dev_put(in6_dev);
2539 }
2540
2541 /*
2542 * Set destination address.
2543 * Special case for SIT interfaces where we create a new "virtual"
2544 * device.
2545 */
2546 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2547 {
2548 struct in6_ifreq ireq;
2549 struct net_device *dev;
2550 int err = -EINVAL;
2551
2552 rtnl_lock();
2553
2554 err = -EFAULT;
2555 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2556 goto err_exit;
2557
2558 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2559
2560 err = -ENODEV;
2561 if (!dev)
2562 goto err_exit;
2563
2564 #if IS_ENABLED(CONFIG_IPV6_SIT)
2565 if (dev->type == ARPHRD_SIT) {
2566 const struct net_device_ops *ops = dev->netdev_ops;
2567 struct ifreq ifr;
2568 struct ip_tunnel_parm p;
2569
2570 err = -EADDRNOTAVAIL;
2571 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2572 goto err_exit;
2573
2574 memset(&p, 0, sizeof(p));
2575 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2576 p.iph.saddr = 0;
2577 p.iph.version = 4;
2578 p.iph.ihl = 5;
2579 p.iph.protocol = IPPROTO_IPV6;
2580 p.iph.ttl = 64;
2581 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2582
2583 if (ops->ndo_do_ioctl) {
2584 mm_segment_t oldfs = get_fs();
2585
2586 set_fs(KERNEL_DS);
2587 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2588 set_fs(oldfs);
2589 } else
2590 err = -EOPNOTSUPP;
2591
2592 if (err == 0) {
2593 err = -ENOBUFS;
2594 dev = __dev_get_by_name(net, p.name);
2595 if (!dev)
2596 goto err_exit;
2597 err = dev_open(dev);
2598 }
2599 }
2600 #endif
2601
2602 err_exit:
2603 rtnl_unlock();
2604 return err;
2605 }
2606
2607 static int ipv6_mc_config(struct sock *sk, bool join,
2608 const struct in6_addr *addr, int ifindex)
2609 {
2610 int ret;
2611
2612 ASSERT_RTNL();
2613
2614 lock_sock(sk);
2615 if (join)
2616 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2617 else
2618 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2619 release_sock(sk);
2620
2621 return ret;
2622 }
2623
2624 /*
2625 * Manual configuration of address on an interface
2626 */
2627 static int inet6_addr_add(struct net *net, int ifindex,
2628 const struct in6_addr *pfx,
2629 const struct in6_addr *peer_pfx,
2630 unsigned int plen, __u32 ifa_flags,
2631 __u32 prefered_lft, __u32 valid_lft)
2632 {
2633 struct inet6_ifaddr *ifp;
2634 struct inet6_dev *idev;
2635 struct net_device *dev;
2636 unsigned long timeout;
2637 clock_t expires;
2638 int scope;
2639 u32 flags;
2640
2641 ASSERT_RTNL();
2642
2643 if (plen > 128)
2644 return -EINVAL;
2645
2646 /* check the lifetime */
2647 if (!valid_lft || prefered_lft > valid_lft)
2648 return -EINVAL;
2649
2650 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2651 return -EINVAL;
2652
2653 dev = __dev_get_by_index(net, ifindex);
2654 if (!dev)
2655 return -ENODEV;
2656
2657 idev = addrconf_add_dev(dev);
2658 if (IS_ERR(idev))
2659 return PTR_ERR(idev);
2660
2661 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2662 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2663 true, pfx, ifindex);
2664
2665 if (ret < 0)
2666 return ret;
2667 }
2668
2669 scope = ipv6_addr_scope(pfx);
2670
2671 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2672 if (addrconf_finite_timeout(timeout)) {
2673 expires = jiffies_to_clock_t(timeout * HZ);
2674 valid_lft = timeout;
2675 flags = RTF_EXPIRES;
2676 } else {
2677 expires = 0;
2678 flags = 0;
2679 ifa_flags |= IFA_F_PERMANENT;
2680 }
2681
2682 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2683 if (addrconf_finite_timeout(timeout)) {
2684 if (timeout == 0)
2685 ifa_flags |= IFA_F_DEPRECATED;
2686 prefered_lft = timeout;
2687 }
2688
2689 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2690 valid_lft, prefered_lft);
2691
2692 if (!IS_ERR(ifp)) {
2693 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2694 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2695 expires, flags);
2696 }
2697
2698 /*
2699 * Note that section 3.1 of RFC 4429 indicates
2700 * that the Optimistic flag should not be set for
2701 * manually configured addresses
2702 */
2703 addrconf_dad_start(ifp);
2704 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2705 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2706 true, jiffies);
2707 in6_ifa_put(ifp);
2708 addrconf_verify_rtnl();
2709 return 0;
2710 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2711 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2712 false, pfx, ifindex);
2713 }
2714
2715 return PTR_ERR(ifp);
2716 }
2717
2718 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2719 const struct in6_addr *pfx, unsigned int plen)
2720 {
2721 struct inet6_ifaddr *ifp;
2722 struct inet6_dev *idev;
2723 struct net_device *dev;
2724
2725 if (plen > 128)
2726 return -EINVAL;
2727
2728 dev = __dev_get_by_index(net, ifindex);
2729 if (!dev)
2730 return -ENODEV;
2731
2732 idev = __in6_dev_get(dev);
2733 if (!idev)
2734 return -ENXIO;
2735
2736 read_lock_bh(&idev->lock);
2737 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2738 if (ifp->prefix_len == plen &&
2739 ipv6_addr_equal(pfx, &ifp->addr)) {
2740 in6_ifa_hold(ifp);
2741 read_unlock_bh(&idev->lock);
2742
2743 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2744 (ifa_flags & IFA_F_MANAGETEMPADDR))
2745 manage_tempaddrs(idev, ifp, 0, 0, false,
2746 jiffies);
2747 ipv6_del_addr(ifp);
2748 addrconf_verify_rtnl();
2749 if (ipv6_addr_is_multicast(pfx)) {
2750 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2751 false, pfx, dev->ifindex);
2752 }
2753 return 0;
2754 }
2755 }
2756 read_unlock_bh(&idev->lock);
2757 return -EADDRNOTAVAIL;
2758 }
2759
2760
2761 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2762 {
2763 struct in6_ifreq ireq;
2764 int err;
2765
2766 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2767 return -EPERM;
2768
2769 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2770 return -EFAULT;
2771
2772 rtnl_lock();
2773 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2774 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2775 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2776 rtnl_unlock();
2777 return err;
2778 }
2779
2780 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2781 {
2782 struct in6_ifreq ireq;
2783 int err;
2784
2785 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2786 return -EPERM;
2787
2788 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2789 return -EFAULT;
2790
2791 rtnl_lock();
2792 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2793 ireq.ifr6_prefixlen);
2794 rtnl_unlock();
2795 return err;
2796 }
2797
2798 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2799 int plen, int scope)
2800 {
2801 struct inet6_ifaddr *ifp;
2802
2803 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2804 scope, IFA_F_PERMANENT,
2805 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2806 if (!IS_ERR(ifp)) {
2807 spin_lock_bh(&ifp->lock);
2808 ifp->flags &= ~IFA_F_TENTATIVE;
2809 spin_unlock_bh(&ifp->lock);
2810 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2811 in6_ifa_put(ifp);
2812 }
2813 }
2814
2815 #if IS_ENABLED(CONFIG_IPV6_SIT)
2816 static void sit_add_v4_addrs(struct inet6_dev *idev)
2817 {
2818 struct in6_addr addr;
2819 struct net_device *dev;
2820 struct net *net = dev_net(idev->dev);
2821 int scope, plen;
2822 u32 pflags = 0;
2823
2824 ASSERT_RTNL();
2825
2826 memset(&addr, 0, sizeof(struct in6_addr));
2827 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2828
2829 if (idev->dev->flags&IFF_POINTOPOINT) {
2830 addr.s6_addr32[0] = htonl(0xfe800000);
2831 scope = IFA_LINK;
2832 plen = 64;
2833 } else {
2834 scope = IPV6_ADDR_COMPATv4;
2835 plen = 96;
2836 pflags |= RTF_NONEXTHOP;
2837 }
2838
2839 if (addr.s6_addr32[3]) {
2840 add_addr(idev, &addr, plen, scope);
2841 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2842 return;
2843 }
2844
2845 for_each_netdev(net, dev) {
2846 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2847 if (in_dev && (dev->flags & IFF_UP)) {
2848 struct in_ifaddr *ifa;
2849
2850 int flag = scope;
2851
2852 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2853
2854 addr.s6_addr32[3] = ifa->ifa_local;
2855
2856 if (ifa->ifa_scope == RT_SCOPE_LINK)
2857 continue;
2858 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2859 if (idev->dev->flags&IFF_POINTOPOINT)
2860 continue;
2861 flag |= IFA_HOST;
2862 }
2863
2864 add_addr(idev, &addr, plen, flag);
2865 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2866 pflags);
2867 }
2868 }
2869 }
2870 }
2871 #endif
2872
2873 static void init_loopback(struct net_device *dev)
2874 {
2875 struct inet6_dev *idev;
2876 struct net_device *sp_dev;
2877 struct inet6_ifaddr *sp_ifa;
2878 struct rt6_info *sp_rt;
2879
2880 /* ::1 */
2881
2882 ASSERT_RTNL();
2883
2884 idev = ipv6_find_idev(dev);
2885 if (!idev) {
2886 pr_debug("%s: add_dev failed\n", __func__);
2887 return;
2888 }
2889
2890 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2891
2892 /* Add routes to other interface's IPv6 addresses */
2893 for_each_netdev(dev_net(dev), sp_dev) {
2894 if (!strcmp(sp_dev->name, dev->name))
2895 continue;
2896
2897 idev = __in6_dev_get(sp_dev);
2898 if (!idev)
2899 continue;
2900
2901 read_lock_bh(&idev->lock);
2902 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2903
2904 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2905 continue;
2906
2907 if (sp_ifa->rt) {
2908 /* This dst has been added to garbage list when
2909 * lo device down, release this obsolete dst and
2910 * reallocate a new router for ifa.
2911 */
2912 if (sp_ifa->rt->dst.obsolete > 0) {
2913 ip6_rt_put(sp_ifa->rt);
2914 sp_ifa->rt = NULL;
2915 } else {
2916 continue;
2917 }
2918 }
2919
2920 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2921
2922 /* Failure cases are ignored */
2923 if (!IS_ERR(sp_rt)) {
2924 sp_ifa->rt = sp_rt;
2925 ip6_ins_rt(sp_rt);
2926 }
2927 }
2928 read_unlock_bh(&idev->lock);
2929 }
2930 }
2931
2932 static void addrconf_add_linklocal(struct inet6_dev *idev,
2933 const struct in6_addr *addr, u32 flags)
2934 {
2935 struct inet6_ifaddr *ifp;
2936 u32 addr_flags = flags | IFA_F_PERMANENT;
2937
2938 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2939 if (idev->cnf.optimistic_dad &&
2940 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2941 addr_flags |= IFA_F_OPTIMISTIC;
2942 #endif
2943
2944 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2945 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2946 if (!IS_ERR(ifp)) {
2947 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2948 addrconf_dad_start(ifp);
2949 in6_ifa_put(ifp);
2950 }
2951 }
2952
2953 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2954 {
2955 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2956 return true;
2957
2958 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2959 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2960 return true;
2961
2962 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2963 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2964 return true;
2965
2966 return false;
2967 }
2968
2969 static int ipv6_generate_stable_address(struct in6_addr *address,
2970 u8 dad_count,
2971 const struct inet6_dev *idev)
2972 {
2973 static DEFINE_SPINLOCK(lock);
2974 static __u32 digest[SHA_DIGEST_WORDS];
2975 static __u32 workspace[SHA_WORKSPACE_WORDS];
2976
2977 static union {
2978 char __data[SHA_MESSAGE_BYTES];
2979 struct {
2980 struct in6_addr secret;
2981 __be32 prefix[2];
2982 unsigned char hwaddr[MAX_ADDR_LEN];
2983 u8 dad_count;
2984 } __packed;
2985 } data;
2986
2987 struct in6_addr secret;
2988 struct in6_addr temp;
2989 struct net *net = dev_net(idev->dev);
2990
2991 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2992
2993 if (idev->cnf.stable_secret.initialized)
2994 secret = idev->cnf.stable_secret.secret;
2995 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2996 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2997 else
2998 return -1;
2999
3000 retry:
3001 spin_lock_bh(&lock);
3002
3003 sha_init(digest);
3004 memset(&data, 0, sizeof(data));
3005 memset(workspace, 0, sizeof(workspace));
3006 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3007 data.prefix[0] = address->s6_addr32[0];
3008 data.prefix[1] = address->s6_addr32[1];
3009 data.secret = secret;
3010 data.dad_count = dad_count;
3011
3012 sha_transform(digest, data.__data, workspace);
3013
3014 temp = *address;
3015 temp.s6_addr32[2] = (__force __be32)digest[0];
3016 temp.s6_addr32[3] = (__force __be32)digest[1];
3017
3018 spin_unlock_bh(&lock);
3019
3020 if (ipv6_reserved_interfaceid(temp)) {
3021 dad_count++;
3022 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3023 return -1;
3024 goto retry;
3025 }
3026
3027 *address = temp;
3028 return 0;
3029 }
3030
3031 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3032 {
3033 struct in6_addr addr;
3034
3035 /* no link local addresses on L3 master devices */
3036 if (netif_is_l3_master(idev->dev))
3037 return;
3038
3039 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3040
3041 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3042 if (!ipv6_generate_stable_address(&addr, 0, idev))
3043 addrconf_add_linklocal(idev, &addr,
3044 IFA_F_STABLE_PRIVACY);
3045 else if (prefix_route)
3046 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3047 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3048 /* addrconf_add_linklocal also adds a prefix_route and we
3049 * only need to care about prefix routes if ipv6_generate_eui64
3050 * couldn't generate one.
3051 */
3052 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3053 addrconf_add_linklocal(idev, &addr, 0);
3054 else if (prefix_route)
3055 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3056 }
3057 }
3058
3059 static void addrconf_dev_config(struct net_device *dev)
3060 {
3061 struct inet6_dev *idev;
3062
3063 ASSERT_RTNL();
3064
3065 if ((dev->type != ARPHRD_ETHER) &&
3066 (dev->type != ARPHRD_FDDI) &&
3067 (dev->type != ARPHRD_ARCNET) &&
3068 (dev->type != ARPHRD_INFINIBAND) &&
3069 (dev->type != ARPHRD_IEEE802154) &&
3070 (dev->type != ARPHRD_IEEE1394) &&
3071 (dev->type != ARPHRD_TUNNEL6) &&
3072 (dev->type != ARPHRD_6LOWPAN)) {
3073 /* Alas, we support only Ethernet autoconfiguration. */
3074 return;
3075 }
3076
3077 idev = addrconf_add_dev(dev);
3078 if (IS_ERR(idev))
3079 return;
3080
3081 addrconf_addr_gen(idev, false);
3082 }
3083
3084 #if IS_ENABLED(CONFIG_IPV6_SIT)
3085 static void addrconf_sit_config(struct net_device *dev)
3086 {
3087 struct inet6_dev *idev;
3088
3089 ASSERT_RTNL();
3090
3091 /*
3092 * Configure the tunnel with one of our IPv4
3093 * addresses... we should configure all of
3094 * our v4 addrs in the tunnel
3095 */
3096
3097 idev = ipv6_find_idev(dev);
3098 if (!idev) {
3099 pr_debug("%s: add_dev failed\n", __func__);
3100 return;
3101 }
3102
3103 if (dev->priv_flags & IFF_ISATAP) {
3104 addrconf_addr_gen(idev, false);
3105 return;
3106 }
3107
3108 sit_add_v4_addrs(idev);
3109
3110 if (dev->flags&IFF_POINTOPOINT)
3111 addrconf_add_mroute(dev);
3112 }
3113 #endif
3114
3115 #if IS_ENABLED(CONFIG_NET_IPGRE)
3116 static void addrconf_gre_config(struct net_device *dev)
3117 {
3118 struct inet6_dev *idev;
3119
3120 ASSERT_RTNL();
3121
3122 idev = ipv6_find_idev(dev);
3123 if (!idev) {
3124 pr_debug("%s: add_dev failed\n", __func__);
3125 return;
3126 }
3127
3128 addrconf_addr_gen(idev, true);
3129 if (dev->flags & IFF_POINTOPOINT)
3130 addrconf_add_mroute(dev);
3131 }
3132 #endif
3133
3134 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3135 void *ptr)
3136 {
3137 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3138 struct inet6_dev *idev = __in6_dev_get(dev);
3139 int run_pending = 0;
3140 int err;
3141
3142 switch (event) {
3143 case NETDEV_REGISTER:
3144 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3145 idev = ipv6_add_dev(dev);
3146 if (IS_ERR(idev))
3147 return notifier_from_errno(PTR_ERR(idev));
3148 }
3149 break;
3150
3151 case NETDEV_CHANGEMTU:
3152 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3153 if (dev->mtu < IPV6_MIN_MTU) {
3154 addrconf_ifdown(dev, 1);
3155 break;
3156 }
3157
3158 if (idev) {
3159 rt6_mtu_change(dev, dev->mtu);
3160 idev->cnf.mtu6 = dev->mtu;
3161 break;
3162 }
3163
3164 /* allocate new idev */
3165 idev = ipv6_add_dev(dev);
3166 if (IS_ERR(idev))
3167 break;
3168
3169 /* device is still not ready */
3170 if (!(idev->if_flags & IF_READY))
3171 break;
3172
3173 run_pending = 1;
3174
3175 /* fall through */
3176
3177 case NETDEV_UP:
3178 case NETDEV_CHANGE:
3179 if (dev->flags & IFF_SLAVE)
3180 break;
3181
3182 if (idev && idev->cnf.disable_ipv6)
3183 break;
3184
3185 if (event == NETDEV_UP) {
3186 if (!addrconf_qdisc_ok(dev)) {
3187 /* device is not ready yet. */
3188 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3189 dev->name);
3190 break;
3191 }
3192
3193 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3194 idev = ipv6_add_dev(dev);
3195
3196 if (!IS_ERR_OR_NULL(idev)) {
3197 idev->if_flags |= IF_READY;
3198 run_pending = 1;
3199 }
3200 } else if (event == NETDEV_CHANGE) {
3201 if (!addrconf_qdisc_ok(dev)) {
3202 /* device is still not ready. */
3203 break;
3204 }
3205
3206 if (idev) {
3207 if (idev->if_flags & IF_READY)
3208 /* device is already configured. */
3209 break;
3210 idev->if_flags |= IF_READY;
3211 }
3212
3213 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3214 dev->name);
3215
3216 run_pending = 1;
3217 }
3218
3219 switch (dev->type) {
3220 #if IS_ENABLED(CONFIG_IPV6_SIT)
3221 case ARPHRD_SIT:
3222 addrconf_sit_config(dev);
3223 break;
3224 #endif
3225 #if IS_ENABLED(CONFIG_NET_IPGRE)
3226 case ARPHRD_IPGRE:
3227 addrconf_gre_config(dev);
3228 break;
3229 #endif
3230 case ARPHRD_LOOPBACK:
3231 init_loopback(dev);
3232 break;
3233
3234 default:
3235 addrconf_dev_config(dev);
3236 break;
3237 }
3238
3239 if (!IS_ERR_OR_NULL(idev)) {
3240 if (run_pending)
3241 addrconf_dad_run(idev);
3242
3243 /*
3244 * If the MTU changed during the interface down,
3245 * when the interface up, the changed MTU must be
3246 * reflected in the idev as well as routers.
3247 */
3248 if (idev->cnf.mtu6 != dev->mtu &&
3249 dev->mtu >= IPV6_MIN_MTU) {
3250 rt6_mtu_change(dev, dev->mtu);
3251 idev->cnf.mtu6 = dev->mtu;
3252 }
3253 idev->tstamp = jiffies;
3254 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3255
3256 /*
3257 * If the changed mtu during down is lower than
3258 * IPV6_MIN_MTU stop IPv6 on this interface.
3259 */
3260 if (dev->mtu < IPV6_MIN_MTU)
3261 addrconf_ifdown(dev, 1);
3262 }
3263 break;
3264
3265 case NETDEV_DOWN:
3266 case NETDEV_UNREGISTER:
3267 /*
3268 * Remove all addresses from this interface.
3269 */
3270 addrconf_ifdown(dev, event != NETDEV_DOWN);
3271 break;
3272
3273 case NETDEV_CHANGENAME:
3274 if (idev) {
3275 snmp6_unregister_dev(idev);
3276 addrconf_sysctl_unregister(idev);
3277 err = addrconf_sysctl_register(idev);
3278 if (err)
3279 return notifier_from_errno(err);
3280 err = snmp6_register_dev(idev);
3281 if (err) {
3282 addrconf_sysctl_unregister(idev);
3283 return notifier_from_errno(err);
3284 }
3285 }
3286 break;
3287
3288 case NETDEV_PRE_TYPE_CHANGE:
3289 case NETDEV_POST_TYPE_CHANGE:
3290 addrconf_type_change(dev, event);
3291 break;
3292 }
3293
3294 return NOTIFY_OK;
3295 }
3296
3297 /*
3298 * addrconf module should be notified of a device going up
3299 */
3300 static struct notifier_block ipv6_dev_notf = {
3301 .notifier_call = addrconf_notify,
3302 };
3303
3304 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3305 {
3306 struct inet6_dev *idev;
3307 ASSERT_RTNL();
3308
3309 idev = __in6_dev_get(dev);
3310
3311 if (event == NETDEV_POST_TYPE_CHANGE)
3312 ipv6_mc_remap(idev);
3313 else if (event == NETDEV_PRE_TYPE_CHANGE)
3314 ipv6_mc_unmap(idev);
3315 }
3316
3317 static int addrconf_ifdown(struct net_device *dev, int how)
3318 {
3319 struct net *net = dev_net(dev);
3320 struct inet6_dev *idev;
3321 struct inet6_ifaddr *ifa;
3322 int state, i;
3323
3324 ASSERT_RTNL();
3325
3326 rt6_ifdown(net, dev);
3327 neigh_ifdown(&nd_tbl, dev);
3328
3329 idev = __in6_dev_get(dev);
3330 if (!idev)
3331 return -ENODEV;
3332
3333 /*
3334 * Step 1: remove reference to ipv6 device from parent device.
3335 * Do not dev_put!
3336 */
3337 if (how) {
3338 idev->dead = 1;
3339
3340 /* protected by rtnl_lock */
3341 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3342
3343 /* Step 1.5: remove snmp6 entry */
3344 snmp6_unregister_dev(idev);
3345
3346 }
3347
3348 /* Step 2: clear hash table */
3349 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3350 struct hlist_head *h = &inet6_addr_lst[i];
3351
3352 spin_lock_bh(&addrconf_hash_lock);
3353 restart:
3354 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3355 if (ifa->idev == idev) {
3356 hlist_del_init_rcu(&ifa->addr_lst);
3357 addrconf_del_dad_work(ifa);
3358 goto restart;
3359 }
3360 }
3361 spin_unlock_bh(&addrconf_hash_lock);
3362 }
3363
3364 write_lock_bh(&idev->lock);
3365
3366 addrconf_del_rs_timer(idev);
3367
3368 /* Step 2: clear flags for stateless addrconf */
3369 if (!how)
3370 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3371
3372 if (how && del_timer(&idev->regen_timer))
3373 in6_dev_put(idev);
3374
3375 /* Step 3: clear tempaddr list */
3376 while (!list_empty(&idev->tempaddr_list)) {
3377 ifa = list_first_entry(&idev->tempaddr_list,
3378 struct inet6_ifaddr, tmp_list);
3379 list_del(&ifa->tmp_list);
3380 write_unlock_bh(&idev->lock);
3381 spin_lock_bh(&ifa->lock);
3382
3383 if (ifa->ifpub) {
3384 in6_ifa_put(ifa->ifpub);
3385 ifa->ifpub = NULL;
3386 }
3387 spin_unlock_bh(&ifa->lock);
3388 in6_ifa_put(ifa);
3389 write_lock_bh(&idev->lock);
3390 }
3391
3392 while (!list_empty(&idev->addr_list)) {
3393 ifa = list_first_entry(&idev->addr_list,
3394 struct inet6_ifaddr, if_list);
3395 addrconf_del_dad_work(ifa);
3396
3397 list_del(&ifa->if_list);
3398
3399 write_unlock_bh(&idev->lock);
3400
3401 spin_lock_bh(&ifa->lock);
3402 state = ifa->state;
3403 ifa->state = INET6_IFADDR_STATE_DEAD;
3404 spin_unlock_bh(&ifa->lock);
3405
3406 if (state != INET6_IFADDR_STATE_DEAD) {
3407 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3408 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3409 }
3410 in6_ifa_put(ifa);
3411
3412 write_lock_bh(&idev->lock);
3413 }
3414
3415 write_unlock_bh(&idev->lock);
3416
3417 /* Step 5: Discard anycast and multicast list */
3418 if (how) {
3419 ipv6_ac_destroy_dev(idev);
3420 ipv6_mc_destroy_dev(idev);
3421 } else {
3422 ipv6_mc_down(idev);
3423 }
3424
3425 idev->tstamp = jiffies;
3426
3427 /* Last: Shot the device (if unregistered) */
3428 if (how) {
3429 addrconf_sysctl_unregister(idev);
3430 neigh_parms_release(&nd_tbl, idev->nd_parms);
3431 neigh_ifdown(&nd_tbl, dev);
3432 in6_dev_put(idev);
3433 }
3434 return 0;
3435 }
3436
3437 static void addrconf_rs_timer(unsigned long data)
3438 {
3439 struct inet6_dev *idev = (struct inet6_dev *)data;
3440 struct net_device *dev = idev->dev;
3441 struct in6_addr lladdr;
3442
3443 write_lock(&idev->lock);
3444 if (idev->dead || !(idev->if_flags & IF_READY))
3445 goto out;
3446
3447 if (!ipv6_accept_ra(idev))
3448 goto out;
3449
3450 /* Announcement received after solicitation was sent */
3451 if (idev->if_flags & IF_RA_RCVD)
3452 goto out;
3453
3454 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3455 write_unlock(&idev->lock);
3456 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3457 ndisc_send_rs(dev, &lladdr,
3458 &in6addr_linklocal_allrouters);
3459 else
3460 goto put;
3461
3462 write_lock(&idev->lock);
3463 /* The wait after the last probe can be shorter */
3464 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3465 idev->cnf.rtr_solicits) ?
3466 idev->cnf.rtr_solicit_delay :
3467 idev->cnf.rtr_solicit_interval);
3468 } else {
3469 /*
3470 * Note: we do not support deprecated "all on-link"
3471 * assumption any longer.
3472 */
3473 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3474 }
3475
3476 out:
3477 write_unlock(&idev->lock);
3478 put:
3479 in6_dev_put(idev);
3480 }
3481
3482 /*
3483 * Duplicate Address Detection
3484 */
3485 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3486 {
3487 unsigned long rand_num;
3488 struct inet6_dev *idev = ifp->idev;
3489
3490 if (ifp->flags & IFA_F_OPTIMISTIC)
3491 rand_num = 0;
3492 else
3493 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3494
3495 ifp->dad_probes = idev->cnf.dad_transmits;
3496 addrconf_mod_dad_work(ifp, rand_num);
3497 }
3498
3499 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3500 {
3501 struct inet6_dev *idev = ifp->idev;
3502 struct net_device *dev = idev->dev;
3503
3504 addrconf_join_solict(dev, &ifp->addr);
3505
3506 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3507
3508 read_lock_bh(&idev->lock);
3509 spin_lock(&ifp->lock);
3510 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3511 goto out;
3512
3513 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3514 idev->cnf.accept_dad < 1 ||
3515 !(ifp->flags&IFA_F_TENTATIVE) ||
3516 ifp->flags & IFA_F_NODAD) {
3517 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3518 spin_unlock(&ifp->lock);
3519 read_unlock_bh(&idev->lock);
3520
3521 addrconf_dad_completed(ifp);
3522 return;
3523 }
3524
3525 if (!(idev->if_flags & IF_READY)) {
3526 spin_unlock(&ifp->lock);
3527 read_unlock_bh(&idev->lock);
3528 /*
3529 * If the device is not ready:
3530 * - keep it tentative if it is a permanent address.
3531 * - otherwise, kill it.
3532 */
3533 in6_ifa_hold(ifp);
3534 addrconf_dad_stop(ifp, 0);
3535 return;
3536 }
3537
3538 /*
3539 * Optimistic nodes can start receiving
3540 * Frames right away
3541 */
3542 if (ifp->flags & IFA_F_OPTIMISTIC) {
3543 ip6_ins_rt(ifp->rt);
3544 if (ipv6_use_optimistic_addr(idev)) {
3545 /* Because optimistic nodes can use this address,
3546 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3547 */
3548 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3549 }
3550 }
3551
3552 addrconf_dad_kick(ifp);
3553 out:
3554 spin_unlock(&ifp->lock);
3555 read_unlock_bh(&idev->lock);
3556 }
3557
3558 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3559 {
3560 bool begin_dad = false;
3561
3562 spin_lock_bh(&ifp->lock);
3563 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3564 ifp->state = INET6_IFADDR_STATE_PREDAD;
3565 begin_dad = true;
3566 }
3567 spin_unlock_bh(&ifp->lock);
3568
3569 if (begin_dad)
3570 addrconf_mod_dad_work(ifp, 0);
3571 }
3572
3573 static void addrconf_dad_work(struct work_struct *w)
3574 {
3575 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3576 struct inet6_ifaddr,
3577 dad_work);
3578 struct inet6_dev *idev = ifp->idev;
3579 struct in6_addr mcaddr;
3580
3581 enum {
3582 DAD_PROCESS,
3583 DAD_BEGIN,
3584 DAD_ABORT,
3585 } action = DAD_PROCESS;
3586
3587 rtnl_lock();
3588
3589 spin_lock_bh(&ifp->lock);
3590 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3591 action = DAD_BEGIN;
3592 ifp->state = INET6_IFADDR_STATE_DAD;
3593 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3594 action = DAD_ABORT;
3595 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3596 }
3597 spin_unlock_bh(&ifp->lock);
3598
3599 if (action == DAD_BEGIN) {
3600 addrconf_dad_begin(ifp);
3601 goto out;
3602 } else if (action == DAD_ABORT) {
3603 addrconf_dad_stop(ifp, 1);
3604 goto out;
3605 }
3606
3607 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3608 goto out;
3609
3610 write_lock_bh(&idev->lock);
3611 if (idev->dead || !(idev->if_flags & IF_READY)) {
3612 write_unlock_bh(&idev->lock);
3613 goto out;
3614 }
3615
3616 spin_lock(&ifp->lock);
3617 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3618 spin_unlock(&ifp->lock);
3619 write_unlock_bh(&idev->lock);
3620 goto out;
3621 }
3622
3623 if (ifp->dad_probes == 0) {
3624 /*
3625 * DAD was successful
3626 */
3627
3628 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3629 spin_unlock(&ifp->lock);
3630 write_unlock_bh(&idev->lock);
3631
3632 addrconf_dad_completed(ifp);
3633
3634 goto out;
3635 }
3636
3637 ifp->dad_probes--;
3638 addrconf_mod_dad_work(ifp,
3639 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3640 spin_unlock(&ifp->lock);
3641 write_unlock_bh(&idev->lock);
3642
3643 /* send a neighbour solicitation for our addr */
3644 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3645 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3646 out:
3647 in6_ifa_put(ifp);
3648 rtnl_unlock();
3649 }
3650
3651 /* ifp->idev must be at least read locked */
3652 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3653 {
3654 struct inet6_ifaddr *ifpiter;
3655 struct inet6_dev *idev = ifp->idev;
3656
3657 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3658 if (ifpiter->scope > IFA_LINK)
3659 break;
3660 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3661 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3662 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3663 IFA_F_PERMANENT)
3664 return false;
3665 }
3666 return true;
3667 }
3668
3669 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3670 {
3671 struct net_device *dev = ifp->idev->dev;
3672 struct in6_addr lladdr;
3673 bool send_rs, send_mld;
3674
3675 addrconf_del_dad_work(ifp);
3676
3677 /*
3678 * Configure the address for reception. Now it is valid.
3679 */
3680
3681 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3682
3683 /* If added prefix is link local and we are prepared to process
3684 router advertisements, start sending router solicitations.
3685 */
3686
3687 read_lock_bh(&ifp->idev->lock);
3688 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3689 send_rs = send_mld &&
3690 ipv6_accept_ra(ifp->idev) &&
3691 ifp->idev->cnf.rtr_solicits > 0 &&
3692 (dev->flags&IFF_LOOPBACK) == 0;
3693 read_unlock_bh(&ifp->idev->lock);
3694
3695 /* While dad is in progress mld report's source address is in6_addrany.
3696 * Resend with proper ll now.
3697 */
3698 if (send_mld)
3699 ipv6_mc_dad_complete(ifp->idev);
3700
3701 if (send_rs) {
3702 /*
3703 * If a host as already performed a random delay
3704 * [...] as part of DAD [...] there is no need
3705 * to delay again before sending the first RS
3706 */
3707 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3708 return;
3709 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3710
3711 write_lock_bh(&ifp->idev->lock);
3712 spin_lock(&ifp->lock);
3713 ifp->idev->rs_probes = 1;
3714 ifp->idev->if_flags |= IF_RS_SENT;
3715 addrconf_mod_rs_timer(ifp->idev,
3716 ifp->idev->cnf.rtr_solicit_interval);
3717 spin_unlock(&ifp->lock);
3718 write_unlock_bh(&ifp->idev->lock);
3719 }
3720 }
3721
3722 static void addrconf_dad_run(struct inet6_dev *idev)
3723 {
3724 struct inet6_ifaddr *ifp;
3725
3726 read_lock_bh(&idev->lock);
3727 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3728 spin_lock(&ifp->lock);
3729 if (ifp->flags & IFA_F_TENTATIVE &&
3730 ifp->state == INET6_IFADDR_STATE_DAD)
3731 addrconf_dad_kick(ifp);
3732 spin_unlock(&ifp->lock);
3733 }
3734 read_unlock_bh(&idev->lock);
3735 }
3736
3737 #ifdef CONFIG_PROC_FS
3738 struct if6_iter_state {
3739 struct seq_net_private p;
3740 int bucket;
3741 int offset;
3742 };
3743
3744 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3745 {
3746 struct inet6_ifaddr *ifa = NULL;
3747 struct if6_iter_state *state = seq->private;
3748 struct net *net = seq_file_net(seq);
3749 int p = 0;
3750
3751 /* initial bucket if pos is 0 */
3752 if (pos == 0) {
3753 state->bucket = 0;
3754 state->offset = 0;
3755 }
3756
3757 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3758 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3759 addr_lst) {
3760 if (!net_eq(dev_net(ifa->idev->dev), net))
3761 continue;
3762 /* sync with offset */
3763 if (p < state->offset) {
3764 p++;
3765 continue;
3766 }
3767 state->offset++;
3768 return ifa;
3769 }
3770
3771 /* prepare for next bucket */
3772 state->offset = 0;
3773 p = 0;
3774 }
3775 return NULL;
3776 }
3777
3778 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3779 struct inet6_ifaddr *ifa)
3780 {
3781 struct if6_iter_state *state = seq->private;
3782 struct net *net = seq_file_net(seq);
3783
3784 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3785 if (!net_eq(dev_net(ifa->idev->dev), net))
3786 continue;
3787 state->offset++;
3788 return ifa;
3789 }
3790
3791 while (++state->bucket < IN6_ADDR_HSIZE) {
3792 state->offset = 0;
3793 hlist_for_each_entry_rcu_bh(ifa,
3794 &inet6_addr_lst[state->bucket], addr_lst) {
3795 if (!net_eq(dev_net(ifa->idev->dev), net))
3796 continue;
3797 state->offset++;
3798 return ifa;
3799 }
3800 }
3801
3802 return NULL;
3803 }
3804
3805 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3806 __acquires(rcu_bh)
3807 {
3808 rcu_read_lock_bh();
3809 return if6_get_first(seq, *pos);
3810 }
3811
3812 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3813 {
3814 struct inet6_ifaddr *ifa;
3815
3816 ifa = if6_get_next(seq, v);
3817 ++*pos;
3818 return ifa;
3819 }
3820
3821 static void if6_seq_stop(struct seq_file *seq, void *v)
3822 __releases(rcu_bh)
3823 {
3824 rcu_read_unlock_bh();
3825 }
3826
3827 static int if6_seq_show(struct seq_file *seq, void *v)
3828 {
3829 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3830 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3831 &ifp->addr,
3832 ifp->idev->dev->ifindex,
3833 ifp->prefix_len,
3834 ifp->scope,
3835 (u8) ifp->flags,
3836 ifp->idev->dev->name);
3837 return 0;
3838 }
3839
3840 static const struct seq_operations if6_seq_ops = {
3841 .start = if6_seq_start,
3842 .next = if6_seq_next,
3843 .show = if6_seq_show,
3844 .stop = if6_seq_stop,
3845 };
3846
3847 static int if6_seq_open(struct inode *inode, struct file *file)
3848 {
3849 return seq_open_net(inode, file, &if6_seq_ops,
3850 sizeof(struct if6_iter_state));
3851 }
3852
3853 static const struct file_operations if6_fops = {
3854 .owner = THIS_MODULE,
3855 .open = if6_seq_open,
3856 .read = seq_read,
3857 .llseek = seq_lseek,
3858 .release = seq_release_net,
3859 };
3860
3861 static int __net_init if6_proc_net_init(struct net *net)
3862 {
3863 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3864 return -ENOMEM;
3865 return 0;
3866 }
3867
3868 static void __net_exit if6_proc_net_exit(struct net *net)
3869 {
3870 remove_proc_entry("if_inet6", net->proc_net);
3871 }
3872
3873 static struct pernet_operations if6_proc_net_ops = {
3874 .init = if6_proc_net_init,
3875 .exit = if6_proc_net_exit,
3876 };
3877
3878 int __init if6_proc_init(void)
3879 {
3880 return register_pernet_subsys(&if6_proc_net_ops);
3881 }
3882
3883 void if6_proc_exit(void)
3884 {
3885 unregister_pernet_subsys(&if6_proc_net_ops);
3886 }
3887 #endif /* CONFIG_PROC_FS */
3888
3889 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3890 /* Check if address is a home address configured on any interface. */
3891 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3892 {
3893 int ret = 0;
3894 struct inet6_ifaddr *ifp = NULL;
3895 unsigned int hash = inet6_addr_hash(addr);
3896
3897 rcu_read_lock_bh();
3898 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3899 if (!net_eq(dev_net(ifp->idev->dev), net))
3900 continue;
3901 if (ipv6_addr_equal(&ifp->addr, addr) &&
3902 (ifp->flags & IFA_F_HOMEADDRESS)) {
3903 ret = 1;
3904 break;
3905 }
3906 }
3907 rcu_read_unlock_bh();
3908 return ret;
3909 }
3910 #endif
3911
3912 /*
3913 * Periodic address status verification
3914 */
3915
3916 static void addrconf_verify_rtnl(void)
3917 {
3918 unsigned long now, next, next_sec, next_sched;
3919 struct inet6_ifaddr *ifp;
3920 int i;
3921
3922 ASSERT_RTNL();
3923
3924 rcu_read_lock_bh();
3925 now = jiffies;
3926 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3927
3928 cancel_delayed_work(&addr_chk_work);
3929
3930 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3931 restart:
3932 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3933 unsigned long age;
3934
3935 /* When setting preferred_lft to a value not zero or
3936 * infinity, while valid_lft is infinity
3937 * IFA_F_PERMANENT has a non-infinity life time.
3938 */
3939 if ((ifp->flags & IFA_F_PERMANENT) &&
3940 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3941 continue;
3942
3943 spin_lock(&ifp->lock);
3944 /* We try to batch several events at once. */
3945 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3946
3947 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3948 age >= ifp->valid_lft) {
3949 spin_unlock(&ifp->lock);
3950 in6_ifa_hold(ifp);
3951 ipv6_del_addr(ifp);
3952 goto restart;
3953 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3954 spin_unlock(&ifp->lock);
3955 continue;
3956 } else if (age >= ifp->prefered_lft) {
3957 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3958 int deprecate = 0;
3959
3960 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3961 deprecate = 1;
3962 ifp->flags |= IFA_F_DEPRECATED;
3963 }
3964
3965 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3966 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3967 next = ifp->tstamp + ifp->valid_lft * HZ;
3968
3969 spin_unlock(&ifp->lock);
3970
3971 if (deprecate) {
3972 in6_ifa_hold(ifp);
3973
3974 ipv6_ifa_notify(0, ifp);
3975 in6_ifa_put(ifp);
3976 goto restart;
3977 }
3978 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3979 !(ifp->flags&IFA_F_TENTATIVE)) {
3980 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3981 ifp->idev->cnf.dad_transmits *
3982 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3983
3984 if (age >= ifp->prefered_lft - regen_advance) {
3985 struct inet6_ifaddr *ifpub = ifp->ifpub;
3986 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3987 next = ifp->tstamp + ifp->prefered_lft * HZ;
3988 if (!ifp->regen_count && ifpub) {
3989 ifp->regen_count++;
3990 in6_ifa_hold(ifp);
3991 in6_ifa_hold(ifpub);
3992 spin_unlock(&ifp->lock);
3993
3994 spin_lock(&ifpub->lock);
3995 ifpub->regen_count = 0;
3996 spin_unlock(&ifpub->lock);
3997 ipv6_create_tempaddr(ifpub, ifp);
3998 in6_ifa_put(ifpub);
3999 in6_ifa_put(ifp);
4000 goto restart;
4001 }
4002 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4003 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4004 spin_unlock(&ifp->lock);
4005 } else {
4006 /* ifp->prefered_lft <= ifp->valid_lft */
4007 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4008 next = ifp->tstamp + ifp->prefered_lft * HZ;
4009 spin_unlock(&ifp->lock);
4010 }
4011 }
4012 }
4013
4014 next_sec = round_jiffies_up(next);
4015 next_sched = next;
4016
4017 /* If rounded timeout is accurate enough, accept it. */
4018 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4019 next_sched = next_sec;
4020
4021 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4022 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4023 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4024
4025 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4026 now, next, next_sec, next_sched);
4027 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4028 rcu_read_unlock_bh();
4029 }
4030
4031 static void addrconf_verify_work(struct work_struct *w)
4032 {
4033 rtnl_lock();
4034 addrconf_verify_rtnl();
4035 rtnl_unlock();
4036 }
4037
4038 static void addrconf_verify(void)
4039 {
4040 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4041 }
4042
4043 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4044 struct in6_addr **peer_pfx)
4045 {
4046 struct in6_addr *pfx = NULL;
4047
4048 *peer_pfx = NULL;
4049
4050 if (addr)
4051 pfx = nla_data(addr);
4052
4053 if (local) {
4054 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4055 *peer_pfx = pfx;
4056 pfx = nla_data(local);
4057 }
4058
4059 return pfx;
4060 }
4061
4062 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4063 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4064 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4065 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4066 [IFA_FLAGS] = { .len = sizeof(u32) },
4067 };
4068
4069 static int
4070 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4071 {
4072 struct net *net = sock_net(skb->sk);
4073 struct ifaddrmsg *ifm;
4074 struct nlattr *tb[IFA_MAX+1];
4075 struct in6_addr *pfx, *peer_pfx;
4076 u32 ifa_flags;
4077 int err;
4078
4079 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4080 if (err < 0)
4081 return err;
4082
4083 ifm = nlmsg_data(nlh);
4084 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4085 if (!pfx)
4086 return -EINVAL;
4087
4088 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4089
4090 /* We ignore other flags so far. */
4091 ifa_flags &= IFA_F_MANAGETEMPADDR;
4092
4093 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4094 ifm->ifa_prefixlen);
4095 }
4096
4097 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4098 u32 prefered_lft, u32 valid_lft)
4099 {
4100 u32 flags;
4101 clock_t expires;
4102 unsigned long timeout;
4103 bool was_managetempaddr;
4104 bool had_prefixroute;
4105
4106 ASSERT_RTNL();
4107
4108 if (!valid_lft || (prefered_lft > valid_lft))
4109 return -EINVAL;
4110
4111 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4112 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4113 return -EINVAL;
4114
4115 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4116 if (addrconf_finite_timeout(timeout)) {
4117 expires = jiffies_to_clock_t(timeout * HZ);
4118 valid_lft = timeout;
4119 flags = RTF_EXPIRES;
4120 } else {
4121 expires = 0;
4122 flags = 0;
4123 ifa_flags |= IFA_F_PERMANENT;
4124 }
4125
4126 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4127 if (addrconf_finite_timeout(timeout)) {
4128 if (timeout == 0)
4129 ifa_flags |= IFA_F_DEPRECATED;
4130 prefered_lft = timeout;
4131 }
4132
4133 spin_lock_bh(&ifp->lock);
4134 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4135 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4136 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4137 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4138 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4139 IFA_F_NOPREFIXROUTE);
4140 ifp->flags |= ifa_flags;
4141 ifp->tstamp = jiffies;
4142 ifp->valid_lft = valid_lft;
4143 ifp->prefered_lft = prefered_lft;
4144
4145 spin_unlock_bh(&ifp->lock);
4146 if (!(ifp->flags&IFA_F_TENTATIVE))
4147 ipv6_ifa_notify(0, ifp);
4148
4149 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4150 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4151 expires, flags);
4152 } else if (had_prefixroute) {
4153 enum cleanup_prefix_rt_t action;
4154 unsigned long rt_expires;
4155
4156 write_lock_bh(&ifp->idev->lock);
4157 action = check_cleanup_prefix_route(ifp, &rt_expires);
4158 write_unlock_bh(&ifp->idev->lock);
4159
4160 if (action != CLEANUP_PREFIX_RT_NOP) {
4161 cleanup_prefix_route(ifp, rt_expires,
4162 action == CLEANUP_PREFIX_RT_DEL);
4163 }
4164 }
4165
4166 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4167 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4168 valid_lft = prefered_lft = 0;
4169 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4170 !was_managetempaddr, jiffies);
4171 }
4172
4173 addrconf_verify_rtnl();
4174
4175 return 0;
4176 }
4177
4178 static int
4179 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4180 {
4181 struct net *net = sock_net(skb->sk);
4182 struct ifaddrmsg *ifm;
4183 struct nlattr *tb[IFA_MAX+1];
4184 struct in6_addr *pfx, *peer_pfx;
4185 struct inet6_ifaddr *ifa;
4186 struct net_device *dev;
4187 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4188 u32 ifa_flags;
4189 int err;
4190
4191 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4192 if (err < 0)
4193 return err;
4194
4195 ifm = nlmsg_data(nlh);
4196 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4197 if (!pfx)
4198 return -EINVAL;
4199
4200 if (tb[IFA_CACHEINFO]) {
4201 struct ifa_cacheinfo *ci;
4202
4203 ci = nla_data(tb[IFA_CACHEINFO]);
4204 valid_lft = ci->ifa_valid;
4205 preferred_lft = ci->ifa_prefered;
4206 } else {
4207 preferred_lft = INFINITY_LIFE_TIME;
4208 valid_lft = INFINITY_LIFE_TIME;
4209 }
4210
4211 dev = __dev_get_by_index(net, ifm->ifa_index);
4212 if (!dev)
4213 return -ENODEV;
4214
4215 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4216
4217 /* We ignore other flags so far. */
4218 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4219 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4220
4221 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4222 if (!ifa) {
4223 /*
4224 * It would be best to check for !NLM_F_CREATE here but
4225 * userspace already relies on not having to provide this.
4226 */
4227 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4228 ifm->ifa_prefixlen, ifa_flags,
4229 preferred_lft, valid_lft);
4230 }
4231
4232 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4233 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4234 err = -EEXIST;
4235 else
4236 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4237
4238 in6_ifa_put(ifa);
4239
4240 return err;
4241 }
4242
4243 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4244 u8 scope, int ifindex)
4245 {
4246 struct ifaddrmsg *ifm;
4247
4248 ifm = nlmsg_data(nlh);
4249 ifm->ifa_family = AF_INET6;
4250 ifm->ifa_prefixlen = prefixlen;
4251 ifm->ifa_flags = flags;
4252 ifm->ifa_scope = scope;
4253 ifm->ifa_index = ifindex;
4254 }
4255
4256 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4257 unsigned long tstamp, u32 preferred, u32 valid)
4258 {
4259 struct ifa_cacheinfo ci;
4260
4261 ci.cstamp = cstamp_delta(cstamp);
4262 ci.tstamp = cstamp_delta(tstamp);
4263 ci.ifa_prefered = preferred;
4264 ci.ifa_valid = valid;
4265
4266 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4267 }
4268
4269 static inline int rt_scope(int ifa_scope)
4270 {
4271 if (ifa_scope & IFA_HOST)
4272 return RT_SCOPE_HOST;
4273 else if (ifa_scope & IFA_LINK)
4274 return RT_SCOPE_LINK;
4275 else if (ifa_scope & IFA_SITE)
4276 return RT_SCOPE_SITE;
4277 else
4278 return RT_SCOPE_UNIVERSE;
4279 }
4280
4281 static inline int inet6_ifaddr_msgsize(void)
4282 {
4283 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4284 + nla_total_size(16) /* IFA_LOCAL */
4285 + nla_total_size(16) /* IFA_ADDRESS */
4286 + nla_total_size(sizeof(struct ifa_cacheinfo))
4287 + nla_total_size(4) /* IFA_FLAGS */;
4288 }
4289
4290 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4291 u32 portid, u32 seq, int event, unsigned int flags)
4292 {
4293 struct nlmsghdr *nlh;
4294 u32 preferred, valid;
4295
4296 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4297 if (!nlh)
4298 return -EMSGSIZE;
4299
4300 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4301 ifa->idev->dev->ifindex);
4302
4303 if (!((ifa->flags&IFA_F_PERMANENT) &&
4304 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4305 preferred = ifa->prefered_lft;
4306 valid = ifa->valid_lft;
4307 if (preferred != INFINITY_LIFE_TIME) {
4308 long tval = (jiffies - ifa->tstamp)/HZ;
4309 if (preferred > tval)
4310 preferred -= tval;
4311 else
4312 preferred = 0;
4313 if (valid != INFINITY_LIFE_TIME) {
4314 if (valid > tval)
4315 valid -= tval;
4316 else
4317 valid = 0;
4318 }
4319 }
4320 } else {
4321 preferred = INFINITY_LIFE_TIME;
4322 valid = INFINITY_LIFE_TIME;
4323 }
4324
4325 if (!ipv6_addr_any(&ifa->peer_addr)) {
4326 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4327 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4328 goto error;
4329 } else
4330 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4331 goto error;
4332
4333 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4334 goto error;
4335
4336 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4337 goto error;
4338
4339 nlmsg_end(skb, nlh);
4340 return 0;
4341
4342 error:
4343 nlmsg_cancel(skb, nlh);
4344 return -EMSGSIZE;
4345 }
4346
4347 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4348 u32 portid, u32 seq, int event, u16 flags)
4349 {
4350 struct nlmsghdr *nlh;
4351 u8 scope = RT_SCOPE_UNIVERSE;
4352 int ifindex = ifmca->idev->dev->ifindex;
4353
4354 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4355 scope = RT_SCOPE_SITE;
4356
4357 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4358 if (!nlh)
4359 return -EMSGSIZE;
4360
4361 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4362 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4363 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4364 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4365 nlmsg_cancel(skb, nlh);
4366 return -EMSGSIZE;
4367 }
4368
4369 nlmsg_end(skb, nlh);
4370 return 0;
4371 }
4372
4373 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4374 u32 portid, u32 seq, int event, unsigned int flags)
4375 {
4376 struct nlmsghdr *nlh;
4377 u8 scope = RT_SCOPE_UNIVERSE;
4378 int ifindex = ifaca->aca_idev->dev->ifindex;
4379
4380 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4381 scope = RT_SCOPE_SITE;
4382
4383 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4384 if (!nlh)
4385 return -EMSGSIZE;
4386
4387 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4388 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4389 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4390 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4391 nlmsg_cancel(skb, nlh);
4392 return -EMSGSIZE;
4393 }
4394
4395 nlmsg_end(skb, nlh);
4396 return 0;
4397 }
4398
4399 enum addr_type_t {
4400 UNICAST_ADDR,
4401 MULTICAST_ADDR,
4402 ANYCAST_ADDR,
4403 };
4404
4405 /* called with rcu_read_lock() */
4406 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4407 struct netlink_callback *cb, enum addr_type_t type,
4408 int s_ip_idx, int *p_ip_idx)
4409 {
4410 struct ifmcaddr6 *ifmca;
4411 struct ifacaddr6 *ifaca;
4412 int err = 1;
4413 int ip_idx = *p_ip_idx;
4414
4415 read_lock_bh(&idev->lock);
4416 switch (type) {
4417 case UNICAST_ADDR: {
4418 struct inet6_ifaddr *ifa;
4419
4420 /* unicast address incl. temp addr */
4421 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4422 if (++ip_idx < s_ip_idx)
4423 continue;
4424 err = inet6_fill_ifaddr(skb, ifa,
4425 NETLINK_CB(cb->skb).portid,
4426 cb->nlh->nlmsg_seq,
4427 RTM_NEWADDR,
4428 NLM_F_MULTI);
4429 if (err < 0)
4430 break;
4431 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4432 }
4433 break;
4434 }
4435 case MULTICAST_ADDR:
4436 /* multicast address */
4437 for (ifmca = idev->mc_list; ifmca;
4438 ifmca = ifmca->next, ip_idx++) {
4439 if (ip_idx < s_ip_idx)
4440 continue;
4441 err = inet6_fill_ifmcaddr(skb, ifmca,
4442 NETLINK_CB(cb->skb).portid,
4443 cb->nlh->nlmsg_seq,
4444 RTM_GETMULTICAST,
4445 NLM_F_MULTI);
4446 if (err < 0)
4447 break;
4448 }
4449 break;
4450 case ANYCAST_ADDR:
4451 /* anycast address */
4452 for (ifaca = idev->ac_list; ifaca;
4453 ifaca = ifaca->aca_next, ip_idx++) {
4454 if (ip_idx < s_ip_idx)
4455 continue;
4456 err = inet6_fill_ifacaddr(skb, ifaca,
4457 NETLINK_CB(cb->skb).portid,
4458 cb->nlh->nlmsg_seq,
4459 RTM_GETANYCAST,
4460 NLM_F_MULTI);
4461 if (err < 0)
4462 break;
4463 }
4464 break;
4465 default:
4466 break;
4467 }
4468 read_unlock_bh(&idev->lock);
4469 *p_ip_idx = ip_idx;
4470 return err;
4471 }
4472
4473 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4474 enum addr_type_t type)
4475 {
4476 struct net *net = sock_net(skb->sk);
4477 int h, s_h;
4478 int idx, ip_idx;
4479 int s_idx, s_ip_idx;
4480 struct net_device *dev;
4481 struct inet6_dev *idev;
4482 struct hlist_head *head;
4483
4484 s_h = cb->args[0];
4485 s_idx = idx = cb->args[1];
4486 s_ip_idx = ip_idx = cb->args[2];
4487
4488 rcu_read_lock();
4489 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4490 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4491 idx = 0;
4492 head = &net->dev_index_head[h];
4493 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4494 if (idx < s_idx)
4495 goto cont;
4496 if (h > s_h || idx > s_idx)
4497 s_ip_idx = 0;
4498 ip_idx = 0;
4499 idev = __in6_dev_get(dev);
4500 if (!idev)
4501 goto cont;
4502
4503 if (in6_dump_addrs(idev, skb, cb, type,
4504 s_ip_idx, &ip_idx) < 0)
4505 goto done;
4506 cont:
4507 idx++;
4508 }
4509 }
4510 done:
4511 rcu_read_unlock();
4512 cb->args[0] = h;
4513 cb->args[1] = idx;
4514 cb->args[2] = ip_idx;
4515
4516 return skb->len;
4517 }
4518
4519 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4520 {
4521 enum addr_type_t type = UNICAST_ADDR;
4522
4523 return inet6_dump_addr(skb, cb, type);
4524 }
4525
4526 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4527 {
4528 enum addr_type_t type = MULTICAST_ADDR;
4529
4530 return inet6_dump_addr(skb, cb, type);
4531 }
4532
4533
4534 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4535 {
4536 enum addr_type_t type = ANYCAST_ADDR;
4537
4538 return inet6_dump_addr(skb, cb, type);
4539 }
4540
4541 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4542 {
4543 struct net *net = sock_net(in_skb->sk);
4544 struct ifaddrmsg *ifm;
4545 struct nlattr *tb[IFA_MAX+1];
4546 struct in6_addr *addr = NULL, *peer;
4547 struct net_device *dev = NULL;
4548 struct inet6_ifaddr *ifa;
4549 struct sk_buff *skb;
4550 int err;
4551
4552 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4553 if (err < 0)
4554 goto errout;
4555
4556 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4557 if (!addr) {
4558 err = -EINVAL;
4559 goto errout;
4560 }
4561
4562 ifm = nlmsg_data(nlh);
4563 if (ifm->ifa_index)
4564 dev = __dev_get_by_index(net, ifm->ifa_index);
4565
4566 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4567 if (!ifa) {
4568 err = -EADDRNOTAVAIL;
4569 goto errout;
4570 }
4571
4572 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4573 if (!skb) {
4574 err = -ENOBUFS;
4575 goto errout_ifa;
4576 }
4577
4578 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4579 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4580 if (err < 0) {
4581 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4582 WARN_ON(err == -EMSGSIZE);
4583 kfree_skb(skb);
4584 goto errout_ifa;
4585 }
4586 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4587 errout_ifa:
4588 in6_ifa_put(ifa);
4589 errout:
4590 return err;
4591 }
4592
4593 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4594 {
4595 struct sk_buff *skb;
4596 struct net *net = dev_net(ifa->idev->dev);
4597 int err = -ENOBUFS;
4598
4599 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4600 if (!skb)
4601 goto errout;
4602
4603 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4604 if (err < 0) {
4605 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4606 WARN_ON(err == -EMSGSIZE);
4607 kfree_skb(skb);
4608 goto errout;
4609 }
4610 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4611 return;
4612 errout:
4613 if (err < 0)
4614 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4615 }
4616
4617 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4618 __s32 *array, int bytes)
4619 {
4620 BUG_ON(bytes < (DEVCONF_MAX * 4));
4621
4622 memset(array, 0, bytes);
4623 array[DEVCONF_FORWARDING] = cnf->forwarding;
4624 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4625 array[DEVCONF_MTU6] = cnf->mtu6;
4626 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4627 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4628 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4629 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4630 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4631 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4632 jiffies_to_msecs(cnf->rtr_solicit_interval);
4633 array[DEVCONF_RTR_SOLICIT_DELAY] =
4634 jiffies_to_msecs(cnf->rtr_solicit_delay);
4635 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4636 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4637 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4638 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4639 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4640 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4641 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4642 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4643 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4644 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4645 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4646 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4647 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4648 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4649 #ifdef CONFIG_IPV6_ROUTER_PREF
4650 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4651 array[DEVCONF_RTR_PROBE_INTERVAL] =
4652 jiffies_to_msecs(cnf->rtr_probe_interval);
4653 #ifdef CONFIG_IPV6_ROUTE_INFO
4654 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4655 #endif
4656 #endif
4657 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4658 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4659 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4660 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4661 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4662 #endif
4663 #ifdef CONFIG_IPV6_MROUTE
4664 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4665 #endif
4666 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4667 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4668 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4669 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4670 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4671 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4672 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4673 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4674 /* we omit DEVCONF_STABLE_SECRET for now */
4675 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4676 }
4677
4678 static inline size_t inet6_ifla6_size(void)
4679 {
4680 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4681 + nla_total_size(sizeof(struct ifla_cacheinfo))
4682 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4683 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4684 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4685 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4686 }
4687
4688 static inline size_t inet6_if_nlmsg_size(void)
4689 {
4690 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4691 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4692 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4693 + nla_total_size(4) /* IFLA_MTU */
4694 + nla_total_size(4) /* IFLA_LINK */
4695 + nla_total_size(1) /* IFLA_OPERSTATE */
4696 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4697 }
4698
4699 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4700 int items, int bytes)
4701 {
4702 int i;
4703 int pad = bytes - sizeof(u64) * items;
4704 BUG_ON(pad < 0);
4705
4706 /* Use put_unaligned() because stats may not be aligned for u64. */
4707 put_unaligned(items, &stats[0]);
4708 for (i = 1; i < items; i++)
4709 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4710
4711 memset(&stats[items], 0, pad);
4712 }
4713
4714 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4715 int bytes, size_t syncpoff)
4716 {
4717 int i, c;
4718 u64 buff[IPSTATS_MIB_MAX];
4719 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4720
4721 BUG_ON(pad < 0);
4722
4723 memset(buff, 0, sizeof(buff));
4724 buff[0] = IPSTATS_MIB_MAX;
4725
4726 for_each_possible_cpu(c) {
4727 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4728 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4729 }
4730
4731 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4732 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4733 }
4734
4735 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4736 int bytes)
4737 {
4738 switch (attrtype) {
4739 case IFLA_INET6_STATS:
4740 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4741 offsetof(struct ipstats_mib, syncp));
4742 break;
4743 case IFLA_INET6_ICMP6STATS:
4744 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4745 break;
4746 }
4747 }
4748
4749 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4750 u32 ext_filter_mask)
4751 {
4752 struct nlattr *nla;
4753 struct ifla_cacheinfo ci;
4754
4755 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4756 goto nla_put_failure;
4757 ci.max_reasm_len = IPV6_MAXPLEN;
4758 ci.tstamp = cstamp_delta(idev->tstamp);
4759 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4760 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4761 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4762 goto nla_put_failure;
4763 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4764 if (!nla)
4765 goto nla_put_failure;
4766 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4767
4768 /* XXX - MC not implemented */
4769
4770 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4771 return 0;
4772
4773 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4774 if (!nla)
4775 goto nla_put_failure;
4776 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4777
4778 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4779 if (!nla)
4780 goto nla_put_failure;
4781 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4782
4783 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4784 if (!nla)
4785 goto nla_put_failure;
4786
4787 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4788 goto nla_put_failure;
4789
4790 read_lock_bh(&idev->lock);
4791 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4792 read_unlock_bh(&idev->lock);
4793
4794 return 0;
4795
4796 nla_put_failure:
4797 return -EMSGSIZE;
4798 }
4799
4800 static size_t inet6_get_link_af_size(const struct net_device *dev,
4801 u32 ext_filter_mask)
4802 {
4803 if (!__in6_dev_get(dev))
4804 return 0;
4805
4806 return inet6_ifla6_size();
4807 }
4808
4809 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4810 u32 ext_filter_mask)
4811 {
4812 struct inet6_dev *idev = __in6_dev_get(dev);
4813
4814 if (!idev)
4815 return -ENODATA;
4816
4817 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4818 return -EMSGSIZE;
4819
4820 return 0;
4821 }
4822
4823 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4824 {
4825 struct inet6_ifaddr *ifp;
4826 struct net_device *dev = idev->dev;
4827 bool update_rs = false;
4828 struct in6_addr ll_addr;
4829
4830 ASSERT_RTNL();
4831
4832 if (!token)
4833 return -EINVAL;
4834 if (ipv6_addr_any(token))
4835 return -EINVAL;
4836 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4837 return -EINVAL;
4838 if (!ipv6_accept_ra(idev))
4839 return -EINVAL;
4840 if (idev->cnf.rtr_solicits <= 0)
4841 return -EINVAL;
4842
4843 write_lock_bh(&idev->lock);
4844
4845 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4846 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4847
4848 write_unlock_bh(&idev->lock);
4849
4850 if (!idev->dead && (idev->if_flags & IF_READY) &&
4851 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4852 IFA_F_OPTIMISTIC)) {
4853
4854 /* If we're not ready, then normal ifup will take care
4855 * of this. Otherwise, we need to request our rs here.
4856 */
4857 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4858 update_rs = true;
4859 }
4860
4861 write_lock_bh(&idev->lock);
4862
4863 if (update_rs) {
4864 idev->if_flags |= IF_RS_SENT;
4865 idev->rs_probes = 1;
4866 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4867 }
4868
4869 /* Well, that's kinda nasty ... */
4870 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4871 spin_lock(&ifp->lock);
4872 if (ifp->tokenized) {
4873 ifp->valid_lft = 0;
4874 ifp->prefered_lft = 0;
4875 }
4876 spin_unlock(&ifp->lock);
4877 }
4878
4879 write_unlock_bh(&idev->lock);
4880 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4881 addrconf_verify_rtnl();
4882 return 0;
4883 }
4884
4885 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4886 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4887 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4888 };
4889
4890 static int inet6_validate_link_af(const struct net_device *dev,
4891 const struct nlattr *nla)
4892 {
4893 struct nlattr *tb[IFLA_INET6_MAX + 1];
4894
4895 if (dev && !__in6_dev_get(dev))
4896 return -EAFNOSUPPORT;
4897
4898 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4899 }
4900
4901 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4902 {
4903 int err = -EINVAL;
4904 struct inet6_dev *idev = __in6_dev_get(dev);
4905 struct nlattr *tb[IFLA_INET6_MAX + 1];
4906
4907 if (!idev)
4908 return -EAFNOSUPPORT;
4909
4910 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4911 BUG();
4912
4913 if (tb[IFLA_INET6_TOKEN]) {
4914 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4915 if (err)
4916 return err;
4917 }
4918
4919 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4920 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4921
4922 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4923 mode != IN6_ADDR_GEN_MODE_NONE &&
4924 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4925 return -EINVAL;
4926
4927 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4928 !idev->cnf.stable_secret.initialized &&
4929 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4930 return -EINVAL;
4931
4932 idev->addr_gen_mode = mode;
4933 err = 0;
4934 }
4935
4936 return err;
4937 }
4938
4939 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4940 u32 portid, u32 seq, int event, unsigned int flags)
4941 {
4942 struct net_device *dev = idev->dev;
4943 struct ifinfomsg *hdr;
4944 struct nlmsghdr *nlh;
4945 void *protoinfo;
4946
4947 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4948 if (!nlh)
4949 return -EMSGSIZE;
4950
4951 hdr = nlmsg_data(nlh);
4952 hdr->ifi_family = AF_INET6;
4953 hdr->__ifi_pad = 0;
4954 hdr->ifi_type = dev->type;
4955 hdr->ifi_index = dev->ifindex;
4956 hdr->ifi_flags = dev_get_flags(dev);
4957 hdr->ifi_change = 0;
4958
4959 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4960 (dev->addr_len &&
4961 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4962 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4963 (dev->ifindex != dev_get_iflink(dev) &&
4964 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
4965 nla_put_u8(skb, IFLA_OPERSTATE,
4966 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
4967 goto nla_put_failure;
4968 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4969 if (!protoinfo)
4970 goto nla_put_failure;
4971
4972 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
4973 goto nla_put_failure;
4974
4975 nla_nest_end(skb, protoinfo);
4976 nlmsg_end(skb, nlh);
4977 return 0;
4978
4979 nla_put_failure:
4980 nlmsg_cancel(skb, nlh);
4981 return -EMSGSIZE;
4982 }
4983
4984 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4985 {
4986 struct net *net = sock_net(skb->sk);
4987 int h, s_h;
4988 int idx = 0, s_idx;
4989 struct net_device *dev;
4990 struct inet6_dev *idev;
4991 struct hlist_head *head;
4992
4993 s_h = cb->args[0];
4994 s_idx = cb->args[1];
4995
4996 rcu_read_lock();
4997 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4998 idx = 0;
4999 head = &net->dev_index_head[h];
5000 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5001 if (idx < s_idx)
5002 goto cont;
5003 idev = __in6_dev_get(dev);
5004 if (!idev)
5005 goto cont;
5006 if (inet6_fill_ifinfo(skb, idev,
5007 NETLINK_CB(cb->skb).portid,
5008 cb->nlh->nlmsg_seq,
5009 RTM_NEWLINK, NLM_F_MULTI) < 0)
5010 goto out;
5011 cont:
5012 idx++;
5013 }
5014 }
5015 out:
5016 rcu_read_unlock();
5017 cb->args[1] = idx;
5018 cb->args[0] = h;
5019
5020 return skb->len;
5021 }
5022
5023 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5024 {
5025 struct sk_buff *skb;
5026 struct net *net = dev_net(idev->dev);
5027 int err = -ENOBUFS;
5028
5029 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5030 if (!skb)
5031 goto errout;
5032
5033 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5034 if (err < 0) {
5035 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5036 WARN_ON(err == -EMSGSIZE);
5037 kfree_skb(skb);
5038 goto errout;
5039 }
5040 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5041 return;
5042 errout:
5043 if (err < 0)
5044 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5045 }
5046
5047 static inline size_t inet6_prefix_nlmsg_size(void)
5048 {
5049 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5050 + nla_total_size(sizeof(struct in6_addr))
5051 + nla_total_size(sizeof(struct prefix_cacheinfo));
5052 }
5053
5054 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5055 struct prefix_info *pinfo, u32 portid, u32 seq,
5056 int event, unsigned int flags)
5057 {
5058 struct prefixmsg *pmsg;
5059 struct nlmsghdr *nlh;
5060 struct prefix_cacheinfo ci;
5061
5062 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5063 if (!nlh)
5064 return -EMSGSIZE;
5065
5066 pmsg = nlmsg_data(nlh);
5067 pmsg->prefix_family = AF_INET6;
5068 pmsg->prefix_pad1 = 0;
5069 pmsg->prefix_pad2 = 0;
5070 pmsg->prefix_ifindex = idev->dev->ifindex;
5071 pmsg->prefix_len = pinfo->prefix_len;
5072 pmsg->prefix_type = pinfo->type;
5073 pmsg->prefix_pad3 = 0;
5074 pmsg->prefix_flags = 0;
5075 if (pinfo->onlink)
5076 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5077 if (pinfo->autoconf)
5078 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5079
5080 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5081 goto nla_put_failure;
5082 ci.preferred_time = ntohl(pinfo->prefered);
5083 ci.valid_time = ntohl(pinfo->valid);
5084 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5085 goto nla_put_failure;
5086 nlmsg_end(skb, nlh);
5087 return 0;
5088
5089 nla_put_failure:
5090 nlmsg_cancel(skb, nlh);
5091 return -EMSGSIZE;
5092 }
5093
5094 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5095 struct prefix_info *pinfo)
5096 {
5097 struct sk_buff *skb;
5098 struct net *net = dev_net(idev->dev);
5099 int err = -ENOBUFS;
5100
5101 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5102 if (!skb)
5103 goto errout;
5104
5105 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5106 if (err < 0) {
5107 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5108 WARN_ON(err == -EMSGSIZE);
5109 kfree_skb(skb);
5110 goto errout;
5111 }
5112 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5113 return;
5114 errout:
5115 if (err < 0)
5116 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5117 }
5118
5119 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5120 {
5121 struct net *net = dev_net(ifp->idev->dev);
5122
5123 if (event)
5124 ASSERT_RTNL();
5125
5126 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5127
5128 switch (event) {
5129 case RTM_NEWADDR:
5130 /*
5131 * If the address was optimistic
5132 * we inserted the route at the start of
5133 * our DAD process, so we don't need
5134 * to do it again
5135 */
5136 if (!(ifp->rt->rt6i_node))
5137 ip6_ins_rt(ifp->rt);
5138 if (ifp->idev->cnf.forwarding)
5139 addrconf_join_anycast(ifp);
5140 if (!ipv6_addr_any(&ifp->peer_addr))
5141 addrconf_prefix_route(&ifp->peer_addr, 128,
5142 ifp->idev->dev, 0, 0);
5143 break;
5144 case RTM_DELADDR:
5145 if (ifp->idev->cnf.forwarding)
5146 addrconf_leave_anycast(ifp);
5147 addrconf_leave_solict(ifp->idev, &ifp->addr);
5148 if (!ipv6_addr_any(&ifp->peer_addr)) {
5149 struct rt6_info *rt;
5150
5151 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5152 ifp->idev->dev, 0, 0);
5153 if (rt)
5154 ip6_del_rt(rt);
5155 }
5156 dst_hold(&ifp->rt->dst);
5157
5158 ip6_del_rt(ifp->rt);
5159
5160 rt_genid_bump_ipv6(net);
5161 break;
5162 }
5163 atomic_inc(&net->ipv6.dev_addr_genid);
5164 }
5165
5166 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5167 {
5168 rcu_read_lock_bh();
5169 if (likely(ifp->idev->dead == 0))
5170 __ipv6_ifa_notify(event, ifp);
5171 rcu_read_unlock_bh();
5172 }
5173
5174 #ifdef CONFIG_SYSCTL
5175
5176 static
5177 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5178 void __user *buffer, size_t *lenp, loff_t *ppos)
5179 {
5180 int *valp = ctl->data;
5181 int val = *valp;
5182 loff_t pos = *ppos;
5183 struct ctl_table lctl;
5184 int ret;
5185
5186 /*
5187 * ctl->data points to idev->cnf.forwarding, we should
5188 * not modify it until we get the rtnl lock.
5189 */
5190 lctl = *ctl;
5191 lctl.data = &val;
5192
5193 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5194
5195 if (write)
5196 ret = addrconf_fixup_forwarding(ctl, valp, val);
5197 if (ret)
5198 *ppos = pos;
5199 return ret;
5200 }
5201
5202 static
5203 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5204 void __user *buffer, size_t *lenp, loff_t *ppos)
5205 {
5206 struct inet6_dev *idev = ctl->extra1;
5207 int min_mtu = IPV6_MIN_MTU;
5208 struct ctl_table lctl;
5209
5210 lctl = *ctl;
5211 lctl.extra1 = &min_mtu;
5212 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5213
5214 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5215 }
5216
5217 static void dev_disable_change(struct inet6_dev *idev)
5218 {
5219 struct netdev_notifier_info info;
5220
5221 if (!idev || !idev->dev)
5222 return;
5223
5224 netdev_notifier_info_init(&info, idev->dev);
5225 if (idev->cnf.disable_ipv6)
5226 addrconf_notify(NULL, NETDEV_DOWN, &info);
5227 else
5228 addrconf_notify(NULL, NETDEV_UP, &info);
5229 }
5230
5231 static void addrconf_disable_change(struct net *net, __s32 newf)
5232 {
5233 struct net_device *dev;
5234 struct inet6_dev *idev;
5235
5236 rcu_read_lock();
5237 for_each_netdev_rcu(net, dev) {
5238 idev = __in6_dev_get(dev);
5239 if (idev) {
5240 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5241 idev->cnf.disable_ipv6 = newf;
5242 if (changed)
5243 dev_disable_change(idev);
5244 }
5245 }
5246 rcu_read_unlock();
5247 }
5248
5249 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5250 {
5251 struct net *net;
5252 int old;
5253
5254 if (!rtnl_trylock())
5255 return restart_syscall();
5256
5257 net = (struct net *)table->extra2;
5258 old = *p;
5259 *p = newf;
5260
5261 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5262 rtnl_unlock();
5263 return 0;
5264 }
5265
5266 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5267 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5268 addrconf_disable_change(net, newf);
5269 } else if ((!newf) ^ (!old))
5270 dev_disable_change((struct inet6_dev *)table->extra1);
5271
5272 rtnl_unlock();
5273 return 0;
5274 }
5275
5276 static
5277 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5278 void __user *buffer, size_t *lenp, loff_t *ppos)
5279 {
5280 int *valp = ctl->data;
5281 int val = *valp;
5282 loff_t pos = *ppos;
5283 struct ctl_table lctl;
5284 int ret;
5285
5286 /*
5287 * ctl->data points to idev->cnf.disable_ipv6, we should
5288 * not modify it until we get the rtnl lock.
5289 */
5290 lctl = *ctl;
5291 lctl.data = &val;
5292
5293 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5294
5295 if (write)
5296 ret = addrconf_disable_ipv6(ctl, valp, val);
5297 if (ret)
5298 *ppos = pos;
5299 return ret;
5300 }
5301
5302 static
5303 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5304 void __user *buffer, size_t *lenp, loff_t *ppos)
5305 {
5306 int *valp = ctl->data;
5307 int ret;
5308 int old, new;
5309
5310 old = *valp;
5311 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5312 new = *valp;
5313
5314 if (write && old != new) {
5315 struct net *net = ctl->extra2;
5316
5317 if (!rtnl_trylock())
5318 return restart_syscall();
5319
5320 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5321 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5322 NETCONFA_IFINDEX_DEFAULT,
5323 net->ipv6.devconf_dflt);
5324 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5325 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5326 NETCONFA_IFINDEX_ALL,
5327 net->ipv6.devconf_all);
5328 else {
5329 struct inet6_dev *idev = ctl->extra1;
5330
5331 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5332 idev->dev->ifindex,
5333 &idev->cnf);
5334 }
5335 rtnl_unlock();
5336 }
5337
5338 return ret;
5339 }
5340
5341 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5342 void __user *buffer, size_t *lenp,
5343 loff_t *ppos)
5344 {
5345 int err;
5346 struct in6_addr addr;
5347 char str[IPV6_MAX_STRLEN];
5348 struct ctl_table lctl = *ctl;
5349 struct net *net = ctl->extra2;
5350 struct ipv6_stable_secret *secret = ctl->data;
5351
5352 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5353 return -EIO;
5354
5355 lctl.maxlen = IPV6_MAX_STRLEN;
5356 lctl.data = str;
5357
5358 if (!rtnl_trylock())
5359 return restart_syscall();
5360
5361 if (!write && !secret->initialized) {
5362 err = -EIO;
5363 goto out;
5364 }
5365
5366 if (!write) {
5367 err = snprintf(str, sizeof(str), "%pI6",
5368 &secret->secret);
5369 if (err >= sizeof(str)) {
5370 err = -EIO;
5371 goto out;
5372 }
5373 }
5374
5375 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5376 if (err || !write)
5377 goto out;
5378
5379 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5380 err = -EIO;
5381 goto out;
5382 }
5383
5384 secret->initialized = true;
5385 secret->secret = addr;
5386
5387 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5388 struct net_device *dev;
5389
5390 for_each_netdev(net, dev) {
5391 struct inet6_dev *idev = __in6_dev_get(dev);
5392
5393 if (idev) {
5394 idev->addr_gen_mode =
5395 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5396 }
5397 }
5398 } else {
5399 struct inet6_dev *idev = ctl->extra1;
5400
5401 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5402 }
5403
5404 out:
5405 rtnl_unlock();
5406
5407 return err;
5408 }
5409
5410 static
5411 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5412 int write,
5413 void __user *buffer,
5414 size_t *lenp,
5415 loff_t *ppos)
5416 {
5417 int *valp = ctl->data;
5418 int val = *valp;
5419 loff_t pos = *ppos;
5420 struct ctl_table lctl;
5421 int ret;
5422
5423 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5424 * we should not modify it until we get the rtnl lock.
5425 */
5426 lctl = *ctl;
5427 lctl.data = &val;
5428
5429 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5430
5431 if (write)
5432 ret = addrconf_fixup_linkdown(ctl, valp, val);
5433 if (ret)
5434 *ppos = pos;
5435 return ret;
5436 }
5437
5438 static struct addrconf_sysctl_table
5439 {
5440 struct ctl_table_header *sysctl_header;
5441 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5442 } addrconf_sysctl __read_mostly = {
5443 .sysctl_header = NULL,
5444 .addrconf_vars = {
5445 {
5446 .procname = "forwarding",
5447 .data = &ipv6_devconf.forwarding,
5448 .maxlen = sizeof(int),
5449 .mode = 0644,
5450 .proc_handler = addrconf_sysctl_forward,
5451 },
5452 {
5453 .procname = "hop_limit",
5454 .data = &ipv6_devconf.hop_limit,
5455 .maxlen = sizeof(int),
5456 .mode = 0644,
5457 .proc_handler = proc_dointvec,
5458 },
5459 {
5460 .procname = "mtu",
5461 .data = &ipv6_devconf.mtu6,
5462 .maxlen = sizeof(int),
5463 .mode = 0644,
5464 .proc_handler = addrconf_sysctl_mtu,
5465 },
5466 {
5467 .procname = "accept_ra",
5468 .data = &ipv6_devconf.accept_ra,
5469 .maxlen = sizeof(int),
5470 .mode = 0644,
5471 .proc_handler = proc_dointvec,
5472 },
5473 {
5474 .procname = "accept_redirects",
5475 .data = &ipv6_devconf.accept_redirects,
5476 .maxlen = sizeof(int),
5477 .mode = 0644,
5478 .proc_handler = proc_dointvec,
5479 },
5480 {
5481 .procname = "autoconf",
5482 .data = &ipv6_devconf.autoconf,
5483 .maxlen = sizeof(int),
5484 .mode = 0644,
5485 .proc_handler = proc_dointvec,
5486 },
5487 {
5488 .procname = "dad_transmits",
5489 .data = &ipv6_devconf.dad_transmits,
5490 .maxlen = sizeof(int),
5491 .mode = 0644,
5492 .proc_handler = proc_dointvec,
5493 },
5494 {
5495 .procname = "router_solicitations",
5496 .data = &ipv6_devconf.rtr_solicits,
5497 .maxlen = sizeof(int),
5498 .mode = 0644,
5499 .proc_handler = proc_dointvec,
5500 },
5501 {
5502 .procname = "router_solicitation_interval",
5503 .data = &ipv6_devconf.rtr_solicit_interval,
5504 .maxlen = sizeof(int),
5505 .mode = 0644,
5506 .proc_handler = proc_dointvec_jiffies,
5507 },
5508 {
5509 .procname = "router_solicitation_delay",
5510 .data = &ipv6_devconf.rtr_solicit_delay,
5511 .maxlen = sizeof(int),
5512 .mode = 0644,
5513 .proc_handler = proc_dointvec_jiffies,
5514 },
5515 {
5516 .procname = "force_mld_version",
5517 .data = &ipv6_devconf.force_mld_version,
5518 .maxlen = sizeof(int),
5519 .mode = 0644,
5520 .proc_handler = proc_dointvec,
5521 },
5522 {
5523 .procname = "mldv1_unsolicited_report_interval",
5524 .data =
5525 &ipv6_devconf.mldv1_unsolicited_report_interval,
5526 .maxlen = sizeof(int),
5527 .mode = 0644,
5528 .proc_handler = proc_dointvec_ms_jiffies,
5529 },
5530 {
5531 .procname = "mldv2_unsolicited_report_interval",
5532 .data =
5533 &ipv6_devconf.mldv2_unsolicited_report_interval,
5534 .maxlen = sizeof(int),
5535 .mode = 0644,
5536 .proc_handler = proc_dointvec_ms_jiffies,
5537 },
5538 {
5539 .procname = "use_tempaddr",
5540 .data = &ipv6_devconf.use_tempaddr,
5541 .maxlen = sizeof(int),
5542 .mode = 0644,
5543 .proc_handler = proc_dointvec,
5544 },
5545 {
5546 .procname = "temp_valid_lft",
5547 .data = &ipv6_devconf.temp_valid_lft,
5548 .maxlen = sizeof(int),
5549 .mode = 0644,
5550 .proc_handler = proc_dointvec,
5551 },
5552 {
5553 .procname = "temp_prefered_lft",
5554 .data = &ipv6_devconf.temp_prefered_lft,
5555 .maxlen = sizeof(int),
5556 .mode = 0644,
5557 .proc_handler = proc_dointvec,
5558 },
5559 {
5560 .procname = "regen_max_retry",
5561 .data = &ipv6_devconf.regen_max_retry,
5562 .maxlen = sizeof(int),
5563 .mode = 0644,
5564 .proc_handler = proc_dointvec,
5565 },
5566 {
5567 .procname = "max_desync_factor",
5568 .data = &ipv6_devconf.max_desync_factor,
5569 .maxlen = sizeof(int),
5570 .mode = 0644,
5571 .proc_handler = proc_dointvec,
5572 },
5573 {
5574 .procname = "max_addresses",
5575 .data = &ipv6_devconf.max_addresses,
5576 .maxlen = sizeof(int),
5577 .mode = 0644,
5578 .proc_handler = proc_dointvec,
5579 },
5580 {
5581 .procname = "accept_ra_defrtr",
5582 .data = &ipv6_devconf.accept_ra_defrtr,
5583 .maxlen = sizeof(int),
5584 .mode = 0644,
5585 .proc_handler = proc_dointvec,
5586 },
5587 {
5588 .procname = "accept_ra_min_hop_limit",
5589 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5590 .maxlen = sizeof(int),
5591 .mode = 0644,
5592 .proc_handler = proc_dointvec,
5593 },
5594 {
5595 .procname = "accept_ra_pinfo",
5596 .data = &ipv6_devconf.accept_ra_pinfo,
5597 .maxlen = sizeof(int),
5598 .mode = 0644,
5599 .proc_handler = proc_dointvec,
5600 },
5601 #ifdef CONFIG_IPV6_ROUTER_PREF
5602 {
5603 .procname = "accept_ra_rtr_pref",
5604 .data = &ipv6_devconf.accept_ra_rtr_pref,
5605 .maxlen = sizeof(int),
5606 .mode = 0644,
5607 .proc_handler = proc_dointvec,
5608 },
5609 {
5610 .procname = "router_probe_interval",
5611 .data = &ipv6_devconf.rtr_probe_interval,
5612 .maxlen = sizeof(int),
5613 .mode = 0644,
5614 .proc_handler = proc_dointvec_jiffies,
5615 },
5616 #ifdef CONFIG_IPV6_ROUTE_INFO
5617 {
5618 .procname = "accept_ra_rt_info_max_plen",
5619 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5620 .maxlen = sizeof(int),
5621 .mode = 0644,
5622 .proc_handler = proc_dointvec,
5623 },
5624 #endif
5625 #endif
5626 {
5627 .procname = "proxy_ndp",
5628 .data = &ipv6_devconf.proxy_ndp,
5629 .maxlen = sizeof(int),
5630 .mode = 0644,
5631 .proc_handler = addrconf_sysctl_proxy_ndp,
5632 },
5633 {
5634 .procname = "accept_source_route",
5635 .data = &ipv6_devconf.accept_source_route,
5636 .maxlen = sizeof(int),
5637 .mode = 0644,
5638 .proc_handler = proc_dointvec,
5639 },
5640 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5641 {
5642 .procname = "optimistic_dad",
5643 .data = &ipv6_devconf.optimistic_dad,
5644 .maxlen = sizeof(int),
5645 .mode = 0644,
5646 .proc_handler = proc_dointvec,
5647
5648 },
5649 {
5650 .procname = "use_optimistic",
5651 .data = &ipv6_devconf.use_optimistic,
5652 .maxlen = sizeof(int),
5653 .mode = 0644,
5654 .proc_handler = proc_dointvec,
5655
5656 },
5657 #endif
5658 #ifdef CONFIG_IPV6_MROUTE
5659 {
5660 .procname = "mc_forwarding",
5661 .data = &ipv6_devconf.mc_forwarding,
5662 .maxlen = sizeof(int),
5663 .mode = 0444,
5664 .proc_handler = proc_dointvec,
5665 },
5666 #endif
5667 {
5668 .procname = "disable_ipv6",
5669 .data = &ipv6_devconf.disable_ipv6,
5670 .maxlen = sizeof(int),
5671 .mode = 0644,
5672 .proc_handler = addrconf_sysctl_disable,
5673 },
5674 {
5675 .procname = "accept_dad",
5676 .data = &ipv6_devconf.accept_dad,
5677 .maxlen = sizeof(int),
5678 .mode = 0644,
5679 .proc_handler = proc_dointvec,
5680 },
5681 {
5682 .procname = "force_tllao",
5683 .data = &ipv6_devconf.force_tllao,
5684 .maxlen = sizeof(int),
5685 .mode = 0644,
5686 .proc_handler = proc_dointvec
5687 },
5688 {
5689 .procname = "ndisc_notify",
5690 .data = &ipv6_devconf.ndisc_notify,
5691 .maxlen = sizeof(int),
5692 .mode = 0644,
5693 .proc_handler = proc_dointvec
5694 },
5695 {
5696 .procname = "suppress_frag_ndisc",
5697 .data = &ipv6_devconf.suppress_frag_ndisc,
5698 .maxlen = sizeof(int),
5699 .mode = 0644,
5700 .proc_handler = proc_dointvec
5701 },
5702 {
5703 .procname = "accept_ra_from_local",
5704 .data = &ipv6_devconf.accept_ra_from_local,
5705 .maxlen = sizeof(int),
5706 .mode = 0644,
5707 .proc_handler = proc_dointvec,
5708 },
5709 {
5710 .procname = "accept_ra_mtu",
5711 .data = &ipv6_devconf.accept_ra_mtu,
5712 .maxlen = sizeof(int),
5713 .mode = 0644,
5714 .proc_handler = proc_dointvec,
5715 },
5716 {
5717 .procname = "stable_secret",
5718 .data = &ipv6_devconf.stable_secret,
5719 .maxlen = IPV6_MAX_STRLEN,
5720 .mode = 0600,
5721 .proc_handler = addrconf_sysctl_stable_secret,
5722 },
5723 {
5724 .procname = "use_oif_addrs_only",
5725 .data = &ipv6_devconf.use_oif_addrs_only,
5726 .maxlen = sizeof(int),
5727 .mode = 0644,
5728 .proc_handler = proc_dointvec,
5729 },
5730 {
5731 .procname = "ignore_routes_with_linkdown",
5732 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5733 .maxlen = sizeof(int),
5734 .mode = 0644,
5735 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5736 },
5737 {
5738 /* sentinel */
5739 }
5740 },
5741 };
5742
5743 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5744 struct inet6_dev *idev, struct ipv6_devconf *p)
5745 {
5746 int i;
5747 struct addrconf_sysctl_table *t;
5748 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5749
5750 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5751 if (!t)
5752 goto out;
5753
5754 for (i = 0; t->addrconf_vars[i].data; i++) {
5755 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5756 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5757 t->addrconf_vars[i].extra2 = net;
5758 }
5759
5760 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5761
5762 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5763 if (!t->sysctl_header)
5764 goto free;
5765
5766 p->sysctl = t;
5767 return 0;
5768
5769 free:
5770 kfree(t);
5771 out:
5772 return -ENOBUFS;
5773 }
5774
5775 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5776 {
5777 struct addrconf_sysctl_table *t;
5778
5779 if (!p->sysctl)
5780 return;
5781
5782 t = p->sysctl;
5783 p->sysctl = NULL;
5784 unregister_net_sysctl_table(t->sysctl_header);
5785 kfree(t);
5786 }
5787
5788 static int addrconf_sysctl_register(struct inet6_dev *idev)
5789 {
5790 int err;
5791
5792 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5793 return -EINVAL;
5794
5795 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5796 &ndisc_ifinfo_sysctl_change);
5797 if (err)
5798 return err;
5799 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5800 idev, &idev->cnf);
5801 if (err)
5802 neigh_sysctl_unregister(idev->nd_parms);
5803
5804 return err;
5805 }
5806
5807 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5808 {
5809 __addrconf_sysctl_unregister(&idev->cnf);
5810 neigh_sysctl_unregister(idev->nd_parms);
5811 }
5812
5813
5814 #endif
5815
5816 static int __net_init addrconf_init_net(struct net *net)
5817 {
5818 int err = -ENOMEM;
5819 struct ipv6_devconf *all, *dflt;
5820
5821 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5822 if (!all)
5823 goto err_alloc_all;
5824
5825 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5826 if (!dflt)
5827 goto err_alloc_dflt;
5828
5829 /* these will be inherited by all namespaces */
5830 dflt->autoconf = ipv6_defaults.autoconf;
5831 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5832
5833 dflt->stable_secret.initialized = false;
5834 all->stable_secret.initialized = false;
5835
5836 net->ipv6.devconf_all = all;
5837 net->ipv6.devconf_dflt = dflt;
5838
5839 #ifdef CONFIG_SYSCTL
5840 err = __addrconf_sysctl_register(net, "all", NULL, all);
5841 if (err < 0)
5842 goto err_reg_all;
5843
5844 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5845 if (err < 0)
5846 goto err_reg_dflt;
5847 #endif
5848 return 0;
5849
5850 #ifdef CONFIG_SYSCTL
5851 err_reg_dflt:
5852 __addrconf_sysctl_unregister(all);
5853 err_reg_all:
5854 kfree(dflt);
5855 #endif
5856 err_alloc_dflt:
5857 kfree(all);
5858 err_alloc_all:
5859 return err;
5860 }
5861
5862 static void __net_exit addrconf_exit_net(struct net *net)
5863 {
5864 #ifdef CONFIG_SYSCTL
5865 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5866 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5867 #endif
5868 kfree(net->ipv6.devconf_dflt);
5869 kfree(net->ipv6.devconf_all);
5870 }
5871
5872 static struct pernet_operations addrconf_ops = {
5873 .init = addrconf_init_net,
5874 .exit = addrconf_exit_net,
5875 };
5876
5877 static struct rtnl_af_ops inet6_ops __read_mostly = {
5878 .family = AF_INET6,
5879 .fill_link_af = inet6_fill_link_af,
5880 .get_link_af_size = inet6_get_link_af_size,
5881 .validate_link_af = inet6_validate_link_af,
5882 .set_link_af = inet6_set_link_af,
5883 };
5884
5885 /*
5886 * Init / cleanup code
5887 */
5888
5889 int __init addrconf_init(void)
5890 {
5891 struct inet6_dev *idev;
5892 int i, err;
5893
5894 err = ipv6_addr_label_init();
5895 if (err < 0) {
5896 pr_crit("%s: cannot initialize default policy table: %d\n",
5897 __func__, err);
5898 goto out;
5899 }
5900
5901 err = register_pernet_subsys(&addrconf_ops);
5902 if (err < 0)
5903 goto out_addrlabel;
5904
5905 addrconf_wq = create_workqueue("ipv6_addrconf");
5906 if (!addrconf_wq) {
5907 err = -ENOMEM;
5908 goto out_nowq;
5909 }
5910
5911 /* The addrconf netdev notifier requires that loopback_dev
5912 * has it's ipv6 private information allocated and setup
5913 * before it can bring up and give link-local addresses
5914 * to other devices which are up.
5915 *
5916 * Unfortunately, loopback_dev is not necessarily the first
5917 * entry in the global dev_base list of net devices. In fact,
5918 * it is likely to be the very last entry on that list.
5919 * So this causes the notifier registry below to try and
5920 * give link-local addresses to all devices besides loopback_dev
5921 * first, then loopback_dev, which cases all the non-loopback_dev
5922 * devices to fail to get a link-local address.
5923 *
5924 * So, as a temporary fix, allocate the ipv6 structure for
5925 * loopback_dev first by hand.
5926 * Longer term, all of the dependencies ipv6 has upon the loopback
5927 * device and it being up should be removed.
5928 */
5929 rtnl_lock();
5930 idev = ipv6_add_dev(init_net.loopback_dev);
5931 rtnl_unlock();
5932 if (IS_ERR(idev)) {
5933 err = PTR_ERR(idev);
5934 goto errlo;
5935 }
5936
5937 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5938 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5939
5940 register_netdevice_notifier(&ipv6_dev_notf);
5941
5942 addrconf_verify();
5943
5944 rtnl_af_register(&inet6_ops);
5945
5946 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5947 NULL);
5948 if (err < 0)
5949 goto errout;
5950
5951 /* Only the first call to __rtnl_register can fail */
5952 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5953 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5954 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5955 inet6_dump_ifaddr, NULL);
5956 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5957 inet6_dump_ifmcaddr, NULL);
5958 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5959 inet6_dump_ifacaddr, NULL);
5960 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5961 inet6_netconf_dump_devconf, NULL);
5962
5963 ipv6_addr_label_rtnl_register();
5964
5965 return 0;
5966 errout:
5967 rtnl_af_unregister(&inet6_ops);
5968 unregister_netdevice_notifier(&ipv6_dev_notf);
5969 errlo:
5970 destroy_workqueue(addrconf_wq);
5971 out_nowq:
5972 unregister_pernet_subsys(&addrconf_ops);
5973 out_addrlabel:
5974 ipv6_addr_label_cleanup();
5975 out:
5976 return err;
5977 }
5978
5979 void addrconf_cleanup(void)
5980 {
5981 struct net_device *dev;
5982 int i;
5983
5984 unregister_netdevice_notifier(&ipv6_dev_notf);
5985 unregister_pernet_subsys(&addrconf_ops);
5986 ipv6_addr_label_cleanup();
5987
5988 rtnl_lock();
5989
5990 __rtnl_af_unregister(&inet6_ops);
5991
5992 /* clean dev list */
5993 for_each_netdev(&init_net, dev) {
5994 if (__in6_dev_get(dev) == NULL)
5995 continue;
5996 addrconf_ifdown(dev, 1);
5997 }
5998 addrconf_ifdown(init_net.loopback_dev, 2);
5999
6000 /*
6001 * Check hash table.
6002 */
6003 spin_lock_bh(&addrconf_hash_lock);
6004 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6005 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6006 spin_unlock_bh(&addrconf_hash_lock);
6007 cancel_delayed_work(&addr_chk_work);
6008 rtnl_unlock();
6009
6010 destroy_workqueue(addrconf_wq);
6011 }
Linux kernel - Deliverables
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