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ip6_tunnel: ensure to always have a link local address
[mirror_ubuntu-jammy-kernel.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/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #include <linux/slab.h>
59 #ifdef CONFIG_SYSCTL
60 #include <linux/sysctl.h>
61 #endif
62 #include <linux/capability.h>
63 #include <linux/delay.h>
64 #include <linux/notifier.h>
65 #include <linux/string.h>
66 #include <linux/hash.h>
67
68 #include <net/net_namespace.h>
69 #include <net/sock.h>
70 #include <net/snmp.h>
71
72 #include <net/af_ieee802154.h>
73 #include <net/firewire.h>
74 #include <net/ipv6.h>
75 #include <net/protocol.h>
76 #include <net/ndisc.h>
77 #include <net/ip6_route.h>
78 #include <net/addrconf.h>
79 #include <net/tcp.h>
80 #include <net/ip.h>
81 #include <net/netlink.h>
82 #include <net/pkt_sched.h>
83 #include <linux/if_tunnel.h>
84 #include <linux/rtnetlink.h>
85 #include <linux/netconf.h>
86
87 #ifdef CONFIG_IPV6_PRIVACY
88 #include <linux/random.h>
89 #endif
90
91 #include <linux/uaccess.h>
92 #include <asm/unaligned.h>
93
94 #include <linux/proc_fs.h>
95 #include <linux/seq_file.h>
96 #include <linux/export.h>
97
98 /* Set to 3 to get tracing... */
99 #define ACONF_DEBUG 2
100
101 #if ACONF_DEBUG >= 3
102 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
103 #else
104 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
105 #endif
106
107 #define INFINITY_LIFE_TIME 0xFFFFFFFF
108
109 static inline u32 cstamp_delta(unsigned long cstamp)
110 {
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112 }
113
114 #ifdef CONFIG_SYSCTL
115 static void addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117 #else
118 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
119 {
120 }
121
122 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
123 {
124 }
125 #endif
126
127 #ifdef CONFIG_IPV6_PRIVACY
128 static void __ipv6_regen_rndid(struct inet6_dev *idev);
129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
130 static void ipv6_regen_rndid(unsigned long data);
131 #endif
132
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
135
136 /*
137 * Configured unicast address hash table
138 */
139 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
140 static DEFINE_SPINLOCK(addrconf_hash_lock);
141
142 static void addrconf_verify(unsigned long);
143
144 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
145 static DEFINE_SPINLOCK(addrconf_verify_lock);
146
147 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
148 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
149
150 static void addrconf_type_change(struct net_device *dev,
151 unsigned long event);
152 static int addrconf_ifdown(struct net_device *dev, int how);
153
154 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
155 int plen,
156 const struct net_device *dev,
157 u32 flags, u32 noflags);
158
159 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
160 static void addrconf_dad_timer(unsigned long data);
161 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
162 static void addrconf_dad_run(struct inet6_dev *idev);
163 static void addrconf_rs_timer(unsigned long data);
164 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
166
167 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
168 struct prefix_info *pinfo);
169 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
170 struct net_device *dev);
171
172 static struct ipv6_devconf ipv6_devconf __read_mostly = {
173 .forwarding = 0,
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
176 .accept_ra = 1,
177 .accept_redirects = 1,
178 .autoconf = 1,
179 .force_mld_version = 0,
180 .mldv1_unsolicited_report_interval = 10 * HZ,
181 .mldv2_unsolicited_report_interval = HZ,
182 .dad_transmits = 1,
183 .rtr_solicits = MAX_RTR_SOLICITATIONS,
184 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
185 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
186 #ifdef CONFIG_IPV6_PRIVACY
187 .use_tempaddr = 0,
188 .temp_valid_lft = TEMP_VALID_LIFETIME,
189 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
190 .regen_max_retry = REGEN_MAX_RETRY,
191 .max_desync_factor = MAX_DESYNC_FACTOR,
192 #endif
193 .max_addresses = IPV6_MAX_ADDRESSES,
194 .accept_ra_defrtr = 1,
195 .accept_ra_pinfo = 1,
196 #ifdef CONFIG_IPV6_ROUTER_PREF
197 .accept_ra_rtr_pref = 1,
198 .rtr_probe_interval = 60 * HZ,
199 #ifdef CONFIG_IPV6_ROUTE_INFO
200 .accept_ra_rt_info_max_plen = 0,
201 #endif
202 #endif
203 .proxy_ndp = 0,
204 .accept_source_route = 0, /* we do not accept RH0 by default. */
205 .disable_ipv6 = 0,
206 .accept_dad = 1,
207 };
208
209 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
210 .forwarding = 0,
211 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
212 .mtu6 = IPV6_MIN_MTU,
213 .accept_ra = 1,
214 .accept_redirects = 1,
215 .autoconf = 1,
216 .force_mld_version = 0,
217 .mldv1_unsolicited_report_interval = 10 * HZ,
218 .mldv2_unsolicited_report_interval = HZ,
219 .dad_transmits = 1,
220 .rtr_solicits = MAX_RTR_SOLICITATIONS,
221 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
222 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
223 #ifdef CONFIG_IPV6_PRIVACY
224 .use_tempaddr = 0,
225 .temp_valid_lft = TEMP_VALID_LIFETIME,
226 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
227 .regen_max_retry = REGEN_MAX_RETRY,
228 .max_desync_factor = MAX_DESYNC_FACTOR,
229 #endif
230 .max_addresses = IPV6_MAX_ADDRESSES,
231 .accept_ra_defrtr = 1,
232 .accept_ra_pinfo = 1,
233 #ifdef CONFIG_IPV6_ROUTER_PREF
234 .accept_ra_rtr_pref = 1,
235 .rtr_probe_interval = 60 * HZ,
236 #ifdef CONFIG_IPV6_ROUTE_INFO
237 .accept_ra_rt_info_max_plen = 0,
238 #endif
239 #endif
240 .proxy_ndp = 0,
241 .accept_source_route = 0, /* we do not accept RH0 by default. */
242 .disable_ipv6 = 0,
243 .accept_dad = 1,
244 };
245
246 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
247 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
248 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
249 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
250 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
251 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
252 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
253 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
254
255 /* Check if a valid qdisc is available */
256 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
257 {
258 return !qdisc_tx_is_noop(dev);
259 }
260
261 static void addrconf_del_rs_timer(struct inet6_dev *idev)
262 {
263 if (del_timer(&idev->rs_timer))
264 __in6_dev_put(idev);
265 }
266
267 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
268 {
269 if (del_timer(&ifp->dad_timer))
270 __in6_ifa_put(ifp);
271 }
272
273 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
274 unsigned long when)
275 {
276 if (!timer_pending(&idev->rs_timer))
277 in6_dev_hold(idev);
278 mod_timer(&idev->rs_timer, jiffies + when);
279 }
280
281 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
282 unsigned long when)
283 {
284 if (!timer_pending(&ifp->dad_timer))
285 in6_ifa_hold(ifp);
286 mod_timer(&ifp->dad_timer, jiffies + when);
287 }
288
289 static int snmp6_alloc_dev(struct inet6_dev *idev)
290 {
291 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
292 sizeof(struct ipstats_mib),
293 __alignof__(struct ipstats_mib)) < 0)
294 goto err_ip;
295 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
296 GFP_KERNEL);
297 if (!idev->stats.icmpv6dev)
298 goto err_icmp;
299 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
300 GFP_KERNEL);
301 if (!idev->stats.icmpv6msgdev)
302 goto err_icmpmsg;
303
304 return 0;
305
306 err_icmpmsg:
307 kfree(idev->stats.icmpv6dev);
308 err_icmp:
309 snmp_mib_free((void __percpu **)idev->stats.ipv6);
310 err_ip:
311 return -ENOMEM;
312 }
313
314 static void snmp6_free_dev(struct inet6_dev *idev)
315 {
316 kfree(idev->stats.icmpv6msgdev);
317 kfree(idev->stats.icmpv6dev);
318 snmp_mib_free((void __percpu **)idev->stats.ipv6);
319 }
320
321 /* Nobody refers to this device, we may destroy it. */
322
323 void in6_dev_finish_destroy(struct inet6_dev *idev)
324 {
325 struct net_device *dev = idev->dev;
326
327 WARN_ON(!list_empty(&idev->addr_list));
328 WARN_ON(idev->mc_list != NULL);
329 WARN_ON(timer_pending(&idev->rs_timer));
330
331 #ifdef NET_REFCNT_DEBUG
332 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
333 #endif
334 dev_put(dev);
335 if (!idev->dead) {
336 pr_warn("Freeing alive inet6 device %p\n", idev);
337 return;
338 }
339 snmp6_free_dev(idev);
340 kfree_rcu(idev, rcu);
341 }
342 EXPORT_SYMBOL(in6_dev_finish_destroy);
343
344 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
345 {
346 struct inet6_dev *ndev;
347
348 ASSERT_RTNL();
349
350 if (dev->mtu < IPV6_MIN_MTU)
351 return NULL;
352
353 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
354
355 if (ndev == NULL)
356 return NULL;
357
358 rwlock_init(&ndev->lock);
359 ndev->dev = dev;
360 INIT_LIST_HEAD(&ndev->addr_list);
361 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
362 (unsigned long)ndev);
363 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
364 ndev->cnf.mtu6 = dev->mtu;
365 ndev->cnf.sysctl = NULL;
366 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
367 if (ndev->nd_parms == NULL) {
368 kfree(ndev);
369 return NULL;
370 }
371 if (ndev->cnf.forwarding)
372 dev_disable_lro(dev);
373 /* We refer to the device */
374 dev_hold(dev);
375
376 if (snmp6_alloc_dev(ndev) < 0) {
377 ADBG(KERN_WARNING
378 "%s: cannot allocate memory for statistics; dev=%s.\n",
379 __func__, dev->name);
380 neigh_parms_release(&nd_tbl, ndev->nd_parms);
381 dev_put(dev);
382 kfree(ndev);
383 return NULL;
384 }
385
386 if (snmp6_register_dev(ndev) < 0) {
387 ADBG(KERN_WARNING
388 "%s: cannot create /proc/net/dev_snmp6/%s\n",
389 __func__, dev->name);
390 neigh_parms_release(&nd_tbl, ndev->nd_parms);
391 ndev->dead = 1;
392 in6_dev_finish_destroy(ndev);
393 return NULL;
394 }
395
396 /* One reference from device. We must do this before
397 * we invoke __ipv6_regen_rndid().
398 */
399 in6_dev_hold(ndev);
400
401 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
402 ndev->cnf.accept_dad = -1;
403
404 #if IS_ENABLED(CONFIG_IPV6_SIT)
405 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
406 pr_info("%s: Disabled Multicast RS\n", dev->name);
407 ndev->cnf.rtr_solicits = 0;
408 }
409 #endif
410
411 #ifdef CONFIG_IPV6_PRIVACY
412 INIT_LIST_HEAD(&ndev->tempaddr_list);
413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
414 if ((dev->flags&IFF_LOOPBACK) ||
415 dev->type == ARPHRD_TUNNEL ||
416 dev->type == ARPHRD_TUNNEL6 ||
417 dev->type == ARPHRD_SIT ||
418 dev->type == ARPHRD_NONE) {
419 ndev->cnf.use_tempaddr = -1;
420 } else {
421 in6_dev_hold(ndev);
422 ipv6_regen_rndid((unsigned long) ndev);
423 }
424 #endif
425 ndev->token = in6addr_any;
426
427 if (netif_running(dev) && addrconf_qdisc_ok(dev))
428 ndev->if_flags |= IF_READY;
429
430 ipv6_mc_init_dev(ndev);
431 ndev->tstamp = jiffies;
432 addrconf_sysctl_register(ndev);
433 /* protected by rtnl_lock */
434 rcu_assign_pointer(dev->ip6_ptr, ndev);
435
436 /* Join interface-local all-node multicast group */
437 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
438
439 /* Join all-node multicast group */
440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
441
442 /* Join all-router multicast group if forwarding is set */
443 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
444 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
445
446 return ndev;
447 }
448
449 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
450 {
451 struct inet6_dev *idev;
452
453 ASSERT_RTNL();
454
455 idev = __in6_dev_get(dev);
456 if (!idev) {
457 idev = ipv6_add_dev(dev);
458 if (!idev)
459 return NULL;
460 }
461
462 if (dev->flags&IFF_UP)
463 ipv6_mc_up(idev);
464 return idev;
465 }
466
467 static int inet6_netconf_msgsize_devconf(int type)
468 {
469 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
470 + nla_total_size(4); /* NETCONFA_IFINDEX */
471
472 /* type -1 is used for ALL */
473 if (type == -1 || type == NETCONFA_FORWARDING)
474 size += nla_total_size(4);
475 #ifdef CONFIG_IPV6_MROUTE
476 if (type == -1 || type == NETCONFA_MC_FORWARDING)
477 size += nla_total_size(4);
478 #endif
479
480 return size;
481 }
482
483 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
484 struct ipv6_devconf *devconf, u32 portid,
485 u32 seq, int event, unsigned int flags,
486 int type)
487 {
488 struct nlmsghdr *nlh;
489 struct netconfmsg *ncm;
490
491 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
492 flags);
493 if (nlh == NULL)
494 return -EMSGSIZE;
495
496 ncm = nlmsg_data(nlh);
497 ncm->ncm_family = AF_INET6;
498
499 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
500 goto nla_put_failure;
501
502 /* type -1 is used for ALL */
503 if ((type == -1 || type == NETCONFA_FORWARDING) &&
504 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
505 goto nla_put_failure;
506 #ifdef CONFIG_IPV6_MROUTE
507 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
508 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
509 devconf->mc_forwarding) < 0)
510 goto nla_put_failure;
511 #endif
512 return nlmsg_end(skb, nlh);
513
514 nla_put_failure:
515 nlmsg_cancel(skb, nlh);
516 return -EMSGSIZE;
517 }
518
519 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
520 struct ipv6_devconf *devconf)
521 {
522 struct sk_buff *skb;
523 int err = -ENOBUFS;
524
525 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
526 if (skb == NULL)
527 goto errout;
528
529 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
530 RTM_NEWNETCONF, 0, type);
531 if (err < 0) {
532 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
533 WARN_ON(err == -EMSGSIZE);
534 kfree_skb(skb);
535 goto errout;
536 }
537 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
538 return;
539 errout:
540 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
541 }
542
543 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
544 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
545 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
546 };
547
548 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
549 struct nlmsghdr *nlh)
550 {
551 struct net *net = sock_net(in_skb->sk);
552 struct nlattr *tb[NETCONFA_MAX+1];
553 struct netconfmsg *ncm;
554 struct sk_buff *skb;
555 struct ipv6_devconf *devconf;
556 struct inet6_dev *in6_dev;
557 struct net_device *dev;
558 int ifindex;
559 int err;
560
561 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
562 devconf_ipv6_policy);
563 if (err < 0)
564 goto errout;
565
566 err = EINVAL;
567 if (!tb[NETCONFA_IFINDEX])
568 goto errout;
569
570 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
571 switch (ifindex) {
572 case NETCONFA_IFINDEX_ALL:
573 devconf = net->ipv6.devconf_all;
574 break;
575 case NETCONFA_IFINDEX_DEFAULT:
576 devconf = net->ipv6.devconf_dflt;
577 break;
578 default:
579 dev = __dev_get_by_index(net, ifindex);
580 if (dev == NULL)
581 goto errout;
582 in6_dev = __in6_dev_get(dev);
583 if (in6_dev == NULL)
584 goto errout;
585 devconf = &in6_dev->cnf;
586 break;
587 }
588
589 err = -ENOBUFS;
590 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
591 if (skb == NULL)
592 goto errout;
593
594 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
595 NETLINK_CB(in_skb).portid,
596 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
597 -1);
598 if (err < 0) {
599 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
600 WARN_ON(err == -EMSGSIZE);
601 kfree_skb(skb);
602 goto errout;
603 }
604 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
605 errout:
606 return err;
607 }
608
609 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
610 struct netlink_callback *cb)
611 {
612 struct net *net = sock_net(skb->sk);
613 int h, s_h;
614 int idx, s_idx;
615 struct net_device *dev;
616 struct inet6_dev *idev;
617 struct hlist_head *head;
618
619 s_h = cb->args[0];
620 s_idx = idx = cb->args[1];
621
622 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
623 idx = 0;
624 head = &net->dev_index_head[h];
625 rcu_read_lock();
626 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
627 net->dev_base_seq;
628 hlist_for_each_entry_rcu(dev, head, index_hlist) {
629 if (idx < s_idx)
630 goto cont;
631 idev = __in6_dev_get(dev);
632 if (!idev)
633 goto cont;
634
635 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
636 &idev->cnf,
637 NETLINK_CB(cb->skb).portid,
638 cb->nlh->nlmsg_seq,
639 RTM_NEWNETCONF,
640 NLM_F_MULTI,
641 -1) <= 0) {
642 rcu_read_unlock();
643 goto done;
644 }
645 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
646 cont:
647 idx++;
648 }
649 rcu_read_unlock();
650 }
651 if (h == NETDEV_HASHENTRIES) {
652 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
653 net->ipv6.devconf_all,
654 NETLINK_CB(cb->skb).portid,
655 cb->nlh->nlmsg_seq,
656 RTM_NEWNETCONF, NLM_F_MULTI,
657 -1) <= 0)
658 goto done;
659 else
660 h++;
661 }
662 if (h == NETDEV_HASHENTRIES + 1) {
663 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
664 net->ipv6.devconf_dflt,
665 NETLINK_CB(cb->skb).portid,
666 cb->nlh->nlmsg_seq,
667 RTM_NEWNETCONF, NLM_F_MULTI,
668 -1) <= 0)
669 goto done;
670 else
671 h++;
672 }
673 done:
674 cb->args[0] = h;
675 cb->args[1] = idx;
676
677 return skb->len;
678 }
679
680 #ifdef CONFIG_SYSCTL
681 static void dev_forward_change(struct inet6_dev *idev)
682 {
683 struct net_device *dev;
684 struct inet6_ifaddr *ifa;
685
686 if (!idev)
687 return;
688 dev = idev->dev;
689 if (idev->cnf.forwarding)
690 dev_disable_lro(dev);
691 if (dev->flags & IFF_MULTICAST) {
692 if (idev->cnf.forwarding) {
693 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
694 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
695 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
696 } else {
697 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
698 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
699 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
700 }
701 }
702
703 list_for_each_entry(ifa, &idev->addr_list, if_list) {
704 if (ifa->flags&IFA_F_TENTATIVE)
705 continue;
706 if (idev->cnf.forwarding)
707 addrconf_join_anycast(ifa);
708 else
709 addrconf_leave_anycast(ifa);
710 }
711 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
712 dev->ifindex, &idev->cnf);
713 }
714
715
716 static void addrconf_forward_change(struct net *net, __s32 newf)
717 {
718 struct net_device *dev;
719 struct inet6_dev *idev;
720
721 for_each_netdev(net, dev) {
722 idev = __in6_dev_get(dev);
723 if (idev) {
724 int changed = (!idev->cnf.forwarding) ^ (!newf);
725 idev->cnf.forwarding = newf;
726 if (changed)
727 dev_forward_change(idev);
728 }
729 }
730 }
731
732 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
733 {
734 struct net *net;
735 int old;
736
737 if (!rtnl_trylock())
738 return restart_syscall();
739
740 net = (struct net *)table->extra2;
741 old = *p;
742 *p = newf;
743
744 if (p == &net->ipv6.devconf_dflt->forwarding) {
745 if ((!newf) ^ (!old))
746 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
747 NETCONFA_IFINDEX_DEFAULT,
748 net->ipv6.devconf_dflt);
749 rtnl_unlock();
750 return 0;
751 }
752
753 if (p == &net->ipv6.devconf_all->forwarding) {
754 net->ipv6.devconf_dflt->forwarding = newf;
755 addrconf_forward_change(net, newf);
756 if ((!newf) ^ (!old))
757 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
758 NETCONFA_IFINDEX_ALL,
759 net->ipv6.devconf_all);
760 } else if ((!newf) ^ (!old))
761 dev_forward_change((struct inet6_dev *)table->extra1);
762 rtnl_unlock();
763
764 if (newf)
765 rt6_purge_dflt_routers(net);
766 return 1;
767 }
768 #endif
769
770 /* Nobody refers to this ifaddr, destroy it */
771 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
772 {
773 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
774
775 #ifdef NET_REFCNT_DEBUG
776 pr_debug("%s\n", __func__);
777 #endif
778
779 in6_dev_put(ifp->idev);
780
781 if (del_timer(&ifp->dad_timer))
782 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
783
784 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
785 pr_warn("Freeing alive inet6 address %p\n", ifp);
786 return;
787 }
788 ip6_rt_put(ifp->rt);
789
790 kfree_rcu(ifp, rcu);
791 }
792
793 static void
794 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
795 {
796 struct list_head *p;
797 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
798
799 /*
800 * Each device address list is sorted in order of scope -
801 * global before linklocal.
802 */
803 list_for_each(p, &idev->addr_list) {
804 struct inet6_ifaddr *ifa
805 = list_entry(p, struct inet6_ifaddr, if_list);
806 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
807 break;
808 }
809
810 list_add_tail(&ifp->if_list, p);
811 }
812
813 static u32 inet6_addr_hash(const struct in6_addr *addr)
814 {
815 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
816 }
817
818 /* On success it returns ifp with increased reference count */
819
820 static struct inet6_ifaddr *
821 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
822 const struct in6_addr *peer_addr, int pfxlen,
823 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
824 {
825 struct inet6_ifaddr *ifa = NULL;
826 struct rt6_info *rt;
827 unsigned int hash;
828 int err = 0;
829 int addr_type = ipv6_addr_type(addr);
830
831 if (addr_type == IPV6_ADDR_ANY ||
832 addr_type & IPV6_ADDR_MULTICAST ||
833 (!(idev->dev->flags & IFF_LOOPBACK) &&
834 addr_type & IPV6_ADDR_LOOPBACK))
835 return ERR_PTR(-EADDRNOTAVAIL);
836
837 rcu_read_lock_bh();
838 if (idev->dead) {
839 err = -ENODEV; /*XXX*/
840 goto out2;
841 }
842
843 if (idev->cnf.disable_ipv6) {
844 err = -EACCES;
845 goto out2;
846 }
847
848 spin_lock(&addrconf_hash_lock);
849
850 /* Ignore adding duplicate addresses on an interface */
851 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
852 ADBG("ipv6_add_addr: already assigned\n");
853 err = -EEXIST;
854 goto out;
855 }
856
857 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
858
859 if (ifa == NULL) {
860 ADBG("ipv6_add_addr: malloc failed\n");
861 err = -ENOBUFS;
862 goto out;
863 }
864
865 rt = addrconf_dst_alloc(idev, addr, false);
866 if (IS_ERR(rt)) {
867 err = PTR_ERR(rt);
868 goto out;
869 }
870
871 ifa->addr = *addr;
872 if (peer_addr)
873 ifa->peer_addr = *peer_addr;
874
875 spin_lock_init(&ifa->lock);
876 spin_lock_init(&ifa->state_lock);
877 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
878 (unsigned long)ifa);
879 INIT_HLIST_NODE(&ifa->addr_lst);
880 ifa->scope = scope;
881 ifa->prefix_len = pfxlen;
882 ifa->flags = flags | IFA_F_TENTATIVE;
883 ifa->valid_lft = valid_lft;
884 ifa->prefered_lft = prefered_lft;
885 ifa->cstamp = ifa->tstamp = jiffies;
886 ifa->tokenized = false;
887
888 ifa->rt = rt;
889
890 ifa->idev = idev;
891 in6_dev_hold(idev);
892 /* For caller */
893 in6_ifa_hold(ifa);
894
895 /* Add to big hash table */
896 hash = inet6_addr_hash(addr);
897
898 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
899 spin_unlock(&addrconf_hash_lock);
900
901 write_lock(&idev->lock);
902 /* Add to inet6_dev unicast addr list. */
903 ipv6_link_dev_addr(idev, ifa);
904
905 #ifdef CONFIG_IPV6_PRIVACY
906 if (ifa->flags&IFA_F_TEMPORARY) {
907 list_add(&ifa->tmp_list, &idev->tempaddr_list);
908 in6_ifa_hold(ifa);
909 }
910 #endif
911
912 in6_ifa_hold(ifa);
913 write_unlock(&idev->lock);
914 out2:
915 rcu_read_unlock_bh();
916
917 if (likely(err == 0))
918 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
919 else {
920 kfree(ifa);
921 ifa = ERR_PTR(err);
922 }
923
924 return ifa;
925 out:
926 spin_unlock(&addrconf_hash_lock);
927 goto out2;
928 }
929
930 /* This function wants to get referenced ifp and releases it before return */
931
932 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
933 {
934 struct inet6_ifaddr *ifa, *ifn;
935 struct inet6_dev *idev = ifp->idev;
936 int state;
937 int deleted = 0, onlink = 0;
938 unsigned long expires = jiffies;
939
940 spin_lock_bh(&ifp->state_lock);
941 state = ifp->state;
942 ifp->state = INET6_IFADDR_STATE_DEAD;
943 spin_unlock_bh(&ifp->state_lock);
944
945 if (state == INET6_IFADDR_STATE_DEAD)
946 goto out;
947
948 spin_lock_bh(&addrconf_hash_lock);
949 hlist_del_init_rcu(&ifp->addr_lst);
950 spin_unlock_bh(&addrconf_hash_lock);
951
952 write_lock_bh(&idev->lock);
953 #ifdef CONFIG_IPV6_PRIVACY
954 if (ifp->flags&IFA_F_TEMPORARY) {
955 list_del(&ifp->tmp_list);
956 if (ifp->ifpub) {
957 in6_ifa_put(ifp->ifpub);
958 ifp->ifpub = NULL;
959 }
960 __in6_ifa_put(ifp);
961 }
962 #endif
963
964 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
965 if (ifa == ifp) {
966 list_del_init(&ifp->if_list);
967 __in6_ifa_put(ifp);
968
969 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
970 break;
971 deleted = 1;
972 continue;
973 } else if (ifp->flags & IFA_F_PERMANENT) {
974 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
975 ifp->prefix_len)) {
976 if (ifa->flags & IFA_F_PERMANENT) {
977 onlink = 1;
978 if (deleted)
979 break;
980 } else {
981 unsigned long lifetime;
982
983 if (!onlink)
984 onlink = -1;
985
986 spin_lock(&ifa->lock);
987
988 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
989 /*
990 * Note: Because this address is
991 * not permanent, lifetime <
992 * LONG_MAX / HZ here.
993 */
994 if (time_before(expires,
995 ifa->tstamp + lifetime * HZ))
996 expires = ifa->tstamp + lifetime * HZ;
997 spin_unlock(&ifa->lock);
998 }
999 }
1000 }
1001 }
1002 write_unlock_bh(&idev->lock);
1003
1004 addrconf_del_dad_timer(ifp);
1005
1006 ipv6_ifa_notify(RTM_DELADDR, ifp);
1007
1008 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1009
1010 /*
1011 * Purge or update corresponding prefix
1012 *
1013 * 1) we don't purge prefix here if address was not permanent.
1014 * prefix is managed by its own lifetime.
1015 * 2) if there're no addresses, delete prefix.
1016 * 3) if there're still other permanent address(es),
1017 * corresponding prefix is still permanent.
1018 * 4) otherwise, update prefix lifetime to the
1019 * longest valid lifetime among the corresponding
1020 * addresses on the device.
1021 * Note: subsequent RA will update lifetime.
1022 *
1023 * --yoshfuji
1024 */
1025 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1026 struct in6_addr prefix;
1027 struct rt6_info *rt;
1028
1029 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1030
1031 rt = addrconf_get_prefix_route(&prefix,
1032 ifp->prefix_len,
1033 ifp->idev->dev,
1034 0, RTF_GATEWAY | RTF_DEFAULT);
1035
1036 if (rt) {
1037 if (onlink == 0) {
1038 ip6_del_rt(rt);
1039 rt = NULL;
1040 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1041 rt6_set_expires(rt, expires);
1042 }
1043 }
1044 ip6_rt_put(rt);
1045 }
1046
1047 /* clean up prefsrc entries */
1048 rt6_remove_prefsrc(ifp);
1049 out:
1050 in6_ifa_put(ifp);
1051 }
1052
1053 #ifdef CONFIG_IPV6_PRIVACY
1054 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1055 {
1056 struct inet6_dev *idev = ifp->idev;
1057 struct in6_addr addr, *tmpaddr;
1058 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1059 unsigned long regen_advance;
1060 int tmp_plen;
1061 int ret = 0;
1062 int max_addresses;
1063 u32 addr_flags;
1064 unsigned long now = jiffies;
1065
1066 write_lock(&idev->lock);
1067 if (ift) {
1068 spin_lock_bh(&ift->lock);
1069 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1070 spin_unlock_bh(&ift->lock);
1071 tmpaddr = &addr;
1072 } else {
1073 tmpaddr = NULL;
1074 }
1075 retry:
1076 in6_dev_hold(idev);
1077 if (idev->cnf.use_tempaddr <= 0) {
1078 write_unlock(&idev->lock);
1079 pr_info("%s: use_tempaddr is disabled\n", __func__);
1080 in6_dev_put(idev);
1081 ret = -1;
1082 goto out;
1083 }
1084 spin_lock_bh(&ifp->lock);
1085 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1086 idev->cnf.use_tempaddr = -1; /*XXX*/
1087 spin_unlock_bh(&ifp->lock);
1088 write_unlock(&idev->lock);
1089 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1090 __func__);
1091 in6_dev_put(idev);
1092 ret = -1;
1093 goto out;
1094 }
1095 in6_ifa_hold(ifp);
1096 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1097 __ipv6_try_regen_rndid(idev, tmpaddr);
1098 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1099 age = (now - ifp->tstamp) / HZ;
1100 tmp_valid_lft = min_t(__u32,
1101 ifp->valid_lft,
1102 idev->cnf.temp_valid_lft + age);
1103 tmp_prefered_lft = min_t(__u32,
1104 ifp->prefered_lft,
1105 idev->cnf.temp_prefered_lft + age -
1106 idev->cnf.max_desync_factor);
1107 tmp_plen = ifp->prefix_len;
1108 max_addresses = idev->cnf.max_addresses;
1109 tmp_tstamp = ifp->tstamp;
1110 spin_unlock_bh(&ifp->lock);
1111
1112 regen_advance = idev->cnf.regen_max_retry *
1113 idev->cnf.dad_transmits *
1114 idev->nd_parms->retrans_time / HZ;
1115 write_unlock(&idev->lock);
1116
1117 /* A temporary address is created only if this calculated Preferred
1118 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1119 * an implementation must not create a temporary address with a zero
1120 * Preferred Lifetime.
1121 */
1122 if (tmp_prefered_lft <= regen_advance) {
1123 in6_ifa_put(ifp);
1124 in6_dev_put(idev);
1125 ret = -1;
1126 goto out;
1127 }
1128
1129 addr_flags = IFA_F_TEMPORARY;
1130 /* set in addrconf_prefix_rcv() */
1131 if (ifp->flags & IFA_F_OPTIMISTIC)
1132 addr_flags |= IFA_F_OPTIMISTIC;
1133
1134 ift = !max_addresses ||
1135 ipv6_count_addresses(idev) < max_addresses ?
1136 ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1137 ipv6_addr_scope(&addr), addr_flags,
1138 tmp_valid_lft, tmp_prefered_lft) : NULL;
1139 if (IS_ERR_OR_NULL(ift)) {
1140 in6_ifa_put(ifp);
1141 in6_dev_put(idev);
1142 pr_info("%s: retry temporary address regeneration\n", __func__);
1143 tmpaddr = &addr;
1144 write_lock(&idev->lock);
1145 goto retry;
1146 }
1147
1148 spin_lock_bh(&ift->lock);
1149 ift->ifpub = ifp;
1150 ift->cstamp = now;
1151 ift->tstamp = tmp_tstamp;
1152 spin_unlock_bh(&ift->lock);
1153
1154 addrconf_dad_start(ift);
1155 in6_ifa_put(ift);
1156 in6_dev_put(idev);
1157 out:
1158 return ret;
1159 }
1160 #endif
1161
1162 /*
1163 * Choose an appropriate source address (RFC3484)
1164 */
1165 enum {
1166 IPV6_SADDR_RULE_INIT = 0,
1167 IPV6_SADDR_RULE_LOCAL,
1168 IPV6_SADDR_RULE_SCOPE,
1169 IPV6_SADDR_RULE_PREFERRED,
1170 #ifdef CONFIG_IPV6_MIP6
1171 IPV6_SADDR_RULE_HOA,
1172 #endif
1173 IPV6_SADDR_RULE_OIF,
1174 IPV6_SADDR_RULE_LABEL,
1175 #ifdef CONFIG_IPV6_PRIVACY
1176 IPV6_SADDR_RULE_PRIVACY,
1177 #endif
1178 IPV6_SADDR_RULE_ORCHID,
1179 IPV6_SADDR_RULE_PREFIX,
1180 IPV6_SADDR_RULE_MAX
1181 };
1182
1183 struct ipv6_saddr_score {
1184 int rule;
1185 int addr_type;
1186 struct inet6_ifaddr *ifa;
1187 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1188 int scopedist;
1189 int matchlen;
1190 };
1191
1192 struct ipv6_saddr_dst {
1193 const struct in6_addr *addr;
1194 int ifindex;
1195 int scope;
1196 int label;
1197 unsigned int prefs;
1198 };
1199
1200 static inline int ipv6_saddr_preferred(int type)
1201 {
1202 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1203 return 1;
1204 return 0;
1205 }
1206
1207 static int ipv6_get_saddr_eval(struct net *net,
1208 struct ipv6_saddr_score *score,
1209 struct ipv6_saddr_dst *dst,
1210 int i)
1211 {
1212 int ret;
1213
1214 if (i <= score->rule) {
1215 switch (i) {
1216 case IPV6_SADDR_RULE_SCOPE:
1217 ret = score->scopedist;
1218 break;
1219 case IPV6_SADDR_RULE_PREFIX:
1220 ret = score->matchlen;
1221 break;
1222 default:
1223 ret = !!test_bit(i, score->scorebits);
1224 }
1225 goto out;
1226 }
1227
1228 switch (i) {
1229 case IPV6_SADDR_RULE_INIT:
1230 /* Rule 0: remember if hiscore is not ready yet */
1231 ret = !!score->ifa;
1232 break;
1233 case IPV6_SADDR_RULE_LOCAL:
1234 /* Rule 1: Prefer same address */
1235 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1236 break;
1237 case IPV6_SADDR_RULE_SCOPE:
1238 /* Rule 2: Prefer appropriate scope
1239 *
1240 * ret
1241 * ^
1242 * -1 | d 15
1243 * ---+--+-+---> scope
1244 * |
1245 * | d is scope of the destination.
1246 * B-d | \
1247 * | \ <- smaller scope is better if
1248 * B-15 | \ if scope is enough for destinaion.
1249 * | ret = B - scope (-1 <= scope >= d <= 15).
1250 * d-C-1 | /
1251 * |/ <- greater is better
1252 * -C / if scope is not enough for destination.
1253 * /| ret = scope - C (-1 <= d < scope <= 15).
1254 *
1255 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1256 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1257 * Assume B = 0 and we get C > 29.
1258 */
1259 ret = __ipv6_addr_src_scope(score->addr_type);
1260 if (ret >= dst->scope)
1261 ret = -ret;
1262 else
1263 ret -= 128; /* 30 is enough */
1264 score->scopedist = ret;
1265 break;
1266 case IPV6_SADDR_RULE_PREFERRED:
1267 /* Rule 3: Avoid deprecated and optimistic addresses */
1268 ret = ipv6_saddr_preferred(score->addr_type) ||
1269 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1270 break;
1271 #ifdef CONFIG_IPV6_MIP6
1272 case IPV6_SADDR_RULE_HOA:
1273 {
1274 /* Rule 4: Prefer home address */
1275 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1276 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1277 break;
1278 }
1279 #endif
1280 case IPV6_SADDR_RULE_OIF:
1281 /* Rule 5: Prefer outgoing interface */
1282 ret = (!dst->ifindex ||
1283 dst->ifindex == score->ifa->idev->dev->ifindex);
1284 break;
1285 case IPV6_SADDR_RULE_LABEL:
1286 /* Rule 6: Prefer matching label */
1287 ret = ipv6_addr_label(net,
1288 &score->ifa->addr, score->addr_type,
1289 score->ifa->idev->dev->ifindex) == dst->label;
1290 break;
1291 #ifdef CONFIG_IPV6_PRIVACY
1292 case IPV6_SADDR_RULE_PRIVACY:
1293 {
1294 /* Rule 7: Prefer public address
1295 * Note: prefer temporary address if use_tempaddr >= 2
1296 */
1297 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1298 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1299 score->ifa->idev->cnf.use_tempaddr >= 2;
1300 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1301 break;
1302 }
1303 #endif
1304 case IPV6_SADDR_RULE_ORCHID:
1305 /* Rule 8-: Prefer ORCHID vs ORCHID or
1306 * non-ORCHID vs non-ORCHID
1307 */
1308 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1309 ipv6_addr_orchid(dst->addr));
1310 break;
1311 case IPV6_SADDR_RULE_PREFIX:
1312 /* Rule 8: Use longest matching prefix */
1313 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1314 if (ret > score->ifa->prefix_len)
1315 ret = score->ifa->prefix_len;
1316 score->matchlen = ret;
1317 break;
1318 default:
1319 ret = 0;
1320 }
1321
1322 if (ret)
1323 __set_bit(i, score->scorebits);
1324 score->rule = i;
1325 out:
1326 return ret;
1327 }
1328
1329 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1330 const struct in6_addr *daddr, unsigned int prefs,
1331 struct in6_addr *saddr)
1332 {
1333 struct ipv6_saddr_score scores[2],
1334 *score = &scores[0], *hiscore = &scores[1];
1335 struct ipv6_saddr_dst dst;
1336 struct net_device *dev;
1337 int dst_type;
1338
1339 dst_type = __ipv6_addr_type(daddr);
1340 dst.addr = daddr;
1341 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1342 dst.scope = __ipv6_addr_src_scope(dst_type);
1343 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1344 dst.prefs = prefs;
1345
1346 hiscore->rule = -1;
1347 hiscore->ifa = NULL;
1348
1349 rcu_read_lock();
1350
1351 for_each_netdev_rcu(net, dev) {
1352 struct inet6_dev *idev;
1353
1354 /* Candidate Source Address (section 4)
1355 * - multicast and link-local destination address,
1356 * the set of candidate source address MUST only
1357 * include addresses assigned to interfaces
1358 * belonging to the same link as the outgoing
1359 * interface.
1360 * (- For site-local destination addresses, the
1361 * set of candidate source addresses MUST only
1362 * include addresses assigned to interfaces
1363 * belonging to the same site as the outgoing
1364 * interface.)
1365 */
1366 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1367 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1368 dst.ifindex && dev->ifindex != dst.ifindex)
1369 continue;
1370
1371 idev = __in6_dev_get(dev);
1372 if (!idev)
1373 continue;
1374
1375 read_lock_bh(&idev->lock);
1376 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1377 int i;
1378
1379 /*
1380 * - Tentative Address (RFC2462 section 5.4)
1381 * - A tentative address is not considered
1382 * "assigned to an interface" in the traditional
1383 * sense, unless it is also flagged as optimistic.
1384 * - Candidate Source Address (section 4)
1385 * - In any case, anycast addresses, multicast
1386 * addresses, and the unspecified address MUST
1387 * NOT be included in a candidate set.
1388 */
1389 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1390 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1391 continue;
1392
1393 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1394
1395 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1396 score->addr_type & IPV6_ADDR_MULTICAST)) {
1397 LIMIT_NETDEBUG(KERN_DEBUG
1398 "ADDRCONF: unspecified / multicast address "
1399 "assigned as unicast address on %s",
1400 dev->name);
1401 continue;
1402 }
1403
1404 score->rule = -1;
1405 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1406
1407 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1408 int minihiscore, miniscore;
1409
1410 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1411 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1412
1413 if (minihiscore > miniscore) {
1414 if (i == IPV6_SADDR_RULE_SCOPE &&
1415 score->scopedist > 0) {
1416 /*
1417 * special case:
1418 * each remaining entry
1419 * has too small (not enough)
1420 * scope, because ifa entries
1421 * are sorted by their scope
1422 * values.
1423 */
1424 goto try_nextdev;
1425 }
1426 break;
1427 } else if (minihiscore < miniscore) {
1428 if (hiscore->ifa)
1429 in6_ifa_put(hiscore->ifa);
1430
1431 in6_ifa_hold(score->ifa);
1432
1433 swap(hiscore, score);
1434
1435 /* restore our iterator */
1436 score->ifa = hiscore->ifa;
1437
1438 break;
1439 }
1440 }
1441 }
1442 try_nextdev:
1443 read_unlock_bh(&idev->lock);
1444 }
1445 rcu_read_unlock();
1446
1447 if (!hiscore->ifa)
1448 return -EADDRNOTAVAIL;
1449
1450 *saddr = hiscore->ifa->addr;
1451 in6_ifa_put(hiscore->ifa);
1452 return 0;
1453 }
1454 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1455
1456 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1457 unsigned char banned_flags)
1458 {
1459 struct inet6_ifaddr *ifp;
1460 int err = -EADDRNOTAVAIL;
1461
1462 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1463 if (ifp->scope == IFA_LINK &&
1464 !(ifp->flags & banned_flags)) {
1465 *addr = ifp->addr;
1466 err = 0;
1467 break;
1468 }
1469 }
1470 return err;
1471 }
1472
1473 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1474 unsigned char banned_flags)
1475 {
1476 struct inet6_dev *idev;
1477 int err = -EADDRNOTAVAIL;
1478
1479 rcu_read_lock();
1480 idev = __in6_dev_get(dev);
1481 if (idev) {
1482 read_lock_bh(&idev->lock);
1483 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1484 read_unlock_bh(&idev->lock);
1485 }
1486 rcu_read_unlock();
1487 return err;
1488 }
1489
1490 static int ipv6_count_addresses(struct inet6_dev *idev)
1491 {
1492 int cnt = 0;
1493 struct inet6_ifaddr *ifp;
1494
1495 read_lock_bh(&idev->lock);
1496 list_for_each_entry(ifp, &idev->addr_list, if_list)
1497 cnt++;
1498 read_unlock_bh(&idev->lock);
1499 return cnt;
1500 }
1501
1502 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1503 const struct net_device *dev, int strict)
1504 {
1505 struct inet6_ifaddr *ifp;
1506 unsigned int hash = inet6_addr_hash(addr);
1507
1508 rcu_read_lock_bh();
1509 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1510 if (!net_eq(dev_net(ifp->idev->dev), net))
1511 continue;
1512 if (ipv6_addr_equal(&ifp->addr, addr) &&
1513 !(ifp->flags&IFA_F_TENTATIVE) &&
1514 (dev == NULL || ifp->idev->dev == dev ||
1515 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1516 rcu_read_unlock_bh();
1517 return 1;
1518 }
1519 }
1520
1521 rcu_read_unlock_bh();
1522 return 0;
1523 }
1524 EXPORT_SYMBOL(ipv6_chk_addr);
1525
1526 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1527 struct net_device *dev)
1528 {
1529 unsigned int hash = inet6_addr_hash(addr);
1530 struct inet6_ifaddr *ifp;
1531
1532 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1533 if (!net_eq(dev_net(ifp->idev->dev), net))
1534 continue;
1535 if (ipv6_addr_equal(&ifp->addr, addr)) {
1536 if (dev == NULL || ifp->idev->dev == dev)
1537 return true;
1538 }
1539 }
1540 return false;
1541 }
1542
1543 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1544 {
1545 struct inet6_dev *idev;
1546 struct inet6_ifaddr *ifa;
1547 int onlink;
1548
1549 onlink = 0;
1550 rcu_read_lock();
1551 idev = __in6_dev_get(dev);
1552 if (idev) {
1553 read_lock_bh(&idev->lock);
1554 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1555 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1556 ifa->prefix_len);
1557 if (onlink)
1558 break;
1559 }
1560 read_unlock_bh(&idev->lock);
1561 }
1562 rcu_read_unlock();
1563 return onlink;
1564 }
1565 EXPORT_SYMBOL(ipv6_chk_prefix);
1566
1567 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1568 struct net_device *dev, int strict)
1569 {
1570 struct inet6_ifaddr *ifp, *result = NULL;
1571 unsigned int hash = inet6_addr_hash(addr);
1572
1573 rcu_read_lock_bh();
1574 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1575 if (!net_eq(dev_net(ifp->idev->dev), net))
1576 continue;
1577 if (ipv6_addr_equal(&ifp->addr, addr)) {
1578 if (dev == NULL || ifp->idev->dev == dev ||
1579 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1580 result = ifp;
1581 in6_ifa_hold(ifp);
1582 break;
1583 }
1584 }
1585 }
1586 rcu_read_unlock_bh();
1587
1588 return result;
1589 }
1590
1591 /* Gets referenced address, destroys ifaddr */
1592
1593 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1594 {
1595 if (ifp->flags&IFA_F_PERMANENT) {
1596 spin_lock_bh(&ifp->lock);
1597 addrconf_del_dad_timer(ifp);
1598 ifp->flags |= IFA_F_TENTATIVE;
1599 if (dad_failed)
1600 ifp->flags |= IFA_F_DADFAILED;
1601 spin_unlock_bh(&ifp->lock);
1602 if (dad_failed)
1603 ipv6_ifa_notify(0, ifp);
1604 in6_ifa_put(ifp);
1605 #ifdef CONFIG_IPV6_PRIVACY
1606 } else if (ifp->flags&IFA_F_TEMPORARY) {
1607 struct inet6_ifaddr *ifpub;
1608 spin_lock_bh(&ifp->lock);
1609 ifpub = ifp->ifpub;
1610 if (ifpub) {
1611 in6_ifa_hold(ifpub);
1612 spin_unlock_bh(&ifp->lock);
1613 ipv6_create_tempaddr(ifpub, ifp);
1614 in6_ifa_put(ifpub);
1615 } else {
1616 spin_unlock_bh(&ifp->lock);
1617 }
1618 ipv6_del_addr(ifp);
1619 #endif
1620 } else
1621 ipv6_del_addr(ifp);
1622 }
1623
1624 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1625 {
1626 int err = -ENOENT;
1627
1628 spin_lock(&ifp->state_lock);
1629 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1630 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1631 err = 0;
1632 }
1633 spin_unlock(&ifp->state_lock);
1634
1635 return err;
1636 }
1637
1638 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1639 {
1640 struct inet6_dev *idev = ifp->idev;
1641
1642 if (addrconf_dad_end(ifp)) {
1643 in6_ifa_put(ifp);
1644 return;
1645 }
1646
1647 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1648 ifp->idev->dev->name, &ifp->addr);
1649
1650 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1651 struct in6_addr addr;
1652
1653 addr.s6_addr32[0] = htonl(0xfe800000);
1654 addr.s6_addr32[1] = 0;
1655
1656 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1657 ipv6_addr_equal(&ifp->addr, &addr)) {
1658 /* DAD failed for link-local based on MAC address */
1659 idev->cnf.disable_ipv6 = 1;
1660
1661 pr_info("%s: IPv6 being disabled!\n",
1662 ifp->idev->dev->name);
1663 }
1664 }
1665
1666 addrconf_dad_stop(ifp, 1);
1667 }
1668
1669 /* Join to solicited addr multicast group. */
1670
1671 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1672 {
1673 struct in6_addr maddr;
1674
1675 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1676 return;
1677
1678 addrconf_addr_solict_mult(addr, &maddr);
1679 ipv6_dev_mc_inc(dev, &maddr);
1680 }
1681
1682 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1683 {
1684 struct in6_addr maddr;
1685
1686 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1687 return;
1688
1689 addrconf_addr_solict_mult(addr, &maddr);
1690 __ipv6_dev_mc_dec(idev, &maddr);
1691 }
1692
1693 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1694 {
1695 struct in6_addr addr;
1696 if (ifp->prefix_len == 127) /* RFC 6164 */
1697 return;
1698 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1699 if (ipv6_addr_any(&addr))
1700 return;
1701 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1702 }
1703
1704 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1705 {
1706 struct in6_addr addr;
1707 if (ifp->prefix_len == 127) /* RFC 6164 */
1708 return;
1709 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1710 if (ipv6_addr_any(&addr))
1711 return;
1712 __ipv6_dev_ac_dec(ifp->idev, &addr);
1713 }
1714
1715 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1716 {
1717 if (dev->addr_len != ETH_ALEN)
1718 return -1;
1719 memcpy(eui, dev->dev_addr, 3);
1720 memcpy(eui + 5, dev->dev_addr + 3, 3);
1721
1722 /*
1723 * The zSeries OSA network cards can be shared among various
1724 * OS instances, but the OSA cards have only one MAC address.
1725 * This leads to duplicate address conflicts in conjunction
1726 * with IPv6 if more than one instance uses the same card.
1727 *
1728 * The driver for these cards can deliver a unique 16-bit
1729 * identifier for each instance sharing the same card. It is
1730 * placed instead of 0xFFFE in the interface identifier. The
1731 * "u" bit of the interface identifier is not inverted in this
1732 * case. Hence the resulting interface identifier has local
1733 * scope according to RFC2373.
1734 */
1735 if (dev->dev_id) {
1736 eui[3] = (dev->dev_id >> 8) & 0xFF;
1737 eui[4] = dev->dev_id & 0xFF;
1738 } else {
1739 eui[3] = 0xFF;
1740 eui[4] = 0xFE;
1741 eui[0] ^= 2;
1742 }
1743 return 0;
1744 }
1745
1746 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1747 {
1748 if (dev->addr_len != IEEE802154_ADDR_LEN)
1749 return -1;
1750 memcpy(eui, dev->dev_addr, 8);
1751 eui[0] ^= 2;
1752 return 0;
1753 }
1754
1755 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1756 {
1757 union fwnet_hwaddr *ha;
1758
1759 if (dev->addr_len != FWNET_ALEN)
1760 return -1;
1761
1762 ha = (union fwnet_hwaddr *)dev->dev_addr;
1763
1764 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1765 eui[0] ^= 2;
1766 return 0;
1767 }
1768
1769 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1770 {
1771 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1772 if (dev->addr_len != ARCNET_ALEN)
1773 return -1;
1774 memset(eui, 0, 7);
1775 eui[7] = *(u8 *)dev->dev_addr;
1776 return 0;
1777 }
1778
1779 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1780 {
1781 if (dev->addr_len != INFINIBAND_ALEN)
1782 return -1;
1783 memcpy(eui, dev->dev_addr + 12, 8);
1784 eui[0] |= 2;
1785 return 0;
1786 }
1787
1788 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1789 {
1790 if (addr == 0)
1791 return -1;
1792 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1793 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1794 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1795 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1796 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1797 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1798 eui[1] = 0;
1799 eui[2] = 0x5E;
1800 eui[3] = 0xFE;
1801 memcpy(eui + 4, &addr, 4);
1802 return 0;
1803 }
1804
1805 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1806 {
1807 if (dev->priv_flags & IFF_ISATAP)
1808 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1809 return -1;
1810 }
1811
1812 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1813 {
1814 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1815 }
1816
1817 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1818 {
1819 memcpy(eui, dev->perm_addr, 3);
1820 memcpy(eui + 5, dev->perm_addr + 3, 3);
1821 eui[3] = 0xFF;
1822 eui[4] = 0xFE;
1823 eui[0] ^= 2;
1824 return 0;
1825 }
1826
1827 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1828 {
1829 switch (dev->type) {
1830 case ARPHRD_ETHER:
1831 case ARPHRD_FDDI:
1832 return addrconf_ifid_eui48(eui, dev);
1833 case ARPHRD_ARCNET:
1834 return addrconf_ifid_arcnet(eui, dev);
1835 case ARPHRD_INFINIBAND:
1836 return addrconf_ifid_infiniband(eui, dev);
1837 case ARPHRD_SIT:
1838 return addrconf_ifid_sit(eui, dev);
1839 case ARPHRD_IPGRE:
1840 return addrconf_ifid_gre(eui, dev);
1841 case ARPHRD_IEEE802154:
1842 return addrconf_ifid_eui64(eui, dev);
1843 case ARPHRD_IEEE1394:
1844 return addrconf_ifid_ieee1394(eui, dev);
1845 case ARPHRD_TUNNEL6:
1846 return addrconf_ifid_ip6tnl(eui, dev);
1847 }
1848 return -1;
1849 }
1850
1851 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1852 {
1853 int err = -1;
1854 struct inet6_ifaddr *ifp;
1855
1856 read_lock_bh(&idev->lock);
1857 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1858 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1859 memcpy(eui, ifp->addr.s6_addr+8, 8);
1860 err = 0;
1861 break;
1862 }
1863 }
1864 read_unlock_bh(&idev->lock);
1865 return err;
1866 }
1867
1868 #ifdef CONFIG_IPV6_PRIVACY
1869 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1870 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1871 {
1872 regen:
1873 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1874 idev->rndid[0] &= ~0x02;
1875
1876 /*
1877 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1878 * check if generated address is not inappropriate
1879 *
1880 * - Reserved subnet anycast (RFC 2526)
1881 * 11111101 11....11 1xxxxxxx
1882 * - ISATAP (RFC4214) 6.1
1883 * 00-00-5E-FE-xx-xx-xx-xx
1884 * - value 0
1885 * - XXX: already assigned to an address on the device
1886 */
1887 if (idev->rndid[0] == 0xfd &&
1888 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1889 (idev->rndid[7]&0x80))
1890 goto regen;
1891 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1892 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1893 goto regen;
1894 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1895 goto regen;
1896 }
1897 }
1898
1899 static void ipv6_regen_rndid(unsigned long data)
1900 {
1901 struct inet6_dev *idev = (struct inet6_dev *) data;
1902 unsigned long expires;
1903
1904 rcu_read_lock_bh();
1905 write_lock_bh(&idev->lock);
1906
1907 if (idev->dead)
1908 goto out;
1909
1910 __ipv6_regen_rndid(idev);
1911
1912 expires = jiffies +
1913 idev->cnf.temp_prefered_lft * HZ -
1914 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1915 idev->cnf.max_desync_factor * HZ;
1916 if (time_before(expires, jiffies)) {
1917 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1918 __func__, idev->dev->name);
1919 goto out;
1920 }
1921
1922 if (!mod_timer(&idev->regen_timer, expires))
1923 in6_dev_hold(idev);
1924
1925 out:
1926 write_unlock_bh(&idev->lock);
1927 rcu_read_unlock_bh();
1928 in6_dev_put(idev);
1929 }
1930
1931 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1932 {
1933 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1934 __ipv6_regen_rndid(idev);
1935 }
1936 #endif
1937
1938 /*
1939 * Add prefix route.
1940 */
1941
1942 static void
1943 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1944 unsigned long expires, u32 flags)
1945 {
1946 struct fib6_config cfg = {
1947 .fc_table = RT6_TABLE_PREFIX,
1948 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1949 .fc_ifindex = dev->ifindex,
1950 .fc_expires = expires,
1951 .fc_dst_len = plen,
1952 .fc_flags = RTF_UP | flags,
1953 .fc_nlinfo.nl_net = dev_net(dev),
1954 .fc_protocol = RTPROT_KERNEL,
1955 };
1956
1957 cfg.fc_dst = *pfx;
1958
1959 /* Prevent useless cloning on PtP SIT.
1960 This thing is done here expecting that the whole
1961 class of non-broadcast devices need not cloning.
1962 */
1963 #if IS_ENABLED(CONFIG_IPV6_SIT)
1964 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1965 cfg.fc_flags |= RTF_NONEXTHOP;
1966 #endif
1967
1968 ip6_route_add(&cfg);
1969 }
1970
1971
1972 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1973 int plen,
1974 const struct net_device *dev,
1975 u32 flags, u32 noflags)
1976 {
1977 struct fib6_node *fn;
1978 struct rt6_info *rt = NULL;
1979 struct fib6_table *table;
1980
1981 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1982 if (table == NULL)
1983 return NULL;
1984
1985 read_lock_bh(&table->tb6_lock);
1986 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1987 if (!fn)
1988 goto out;
1989 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1990 if (rt->dst.dev->ifindex != dev->ifindex)
1991 continue;
1992 if ((rt->rt6i_flags & flags) != flags)
1993 continue;
1994 if ((rt->rt6i_flags & noflags) != 0)
1995 continue;
1996 dst_hold(&rt->dst);
1997 break;
1998 }
1999 out:
2000 read_unlock_bh(&table->tb6_lock);
2001 return rt;
2002 }
2003
2004
2005 /* Create "default" multicast route to the interface */
2006
2007 static void addrconf_add_mroute(struct net_device *dev)
2008 {
2009 struct fib6_config cfg = {
2010 .fc_table = RT6_TABLE_LOCAL,
2011 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2012 .fc_ifindex = dev->ifindex,
2013 .fc_dst_len = 8,
2014 .fc_flags = RTF_UP,
2015 .fc_nlinfo.nl_net = dev_net(dev),
2016 };
2017
2018 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2019
2020 ip6_route_add(&cfg);
2021 }
2022
2023 #if IS_ENABLED(CONFIG_IPV6_SIT)
2024 static void sit_route_add(struct net_device *dev)
2025 {
2026 struct fib6_config cfg = {
2027 .fc_table = RT6_TABLE_MAIN,
2028 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2029 .fc_ifindex = dev->ifindex,
2030 .fc_dst_len = 96,
2031 .fc_flags = RTF_UP | RTF_NONEXTHOP,
2032 .fc_nlinfo.nl_net = dev_net(dev),
2033 };
2034
2035 /* prefix length - 96 bits "::d.d.d.d" */
2036 ip6_route_add(&cfg);
2037 }
2038 #endif
2039
2040 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2041 {
2042 struct inet6_dev *idev;
2043
2044 ASSERT_RTNL();
2045
2046 idev = ipv6_find_idev(dev);
2047 if (!idev)
2048 return ERR_PTR(-ENOBUFS);
2049
2050 if (idev->cnf.disable_ipv6)
2051 return ERR_PTR(-EACCES);
2052
2053 /* Add default multicast route */
2054 if (!(dev->flags & IFF_LOOPBACK))
2055 addrconf_add_mroute(dev);
2056
2057 return idev;
2058 }
2059
2060 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2061 {
2062 struct prefix_info *pinfo;
2063 __u32 valid_lft;
2064 __u32 prefered_lft;
2065 int addr_type;
2066 struct inet6_dev *in6_dev;
2067 struct net *net = dev_net(dev);
2068
2069 pinfo = (struct prefix_info *) opt;
2070
2071 if (len < sizeof(struct prefix_info)) {
2072 ADBG("addrconf: prefix option too short\n");
2073 return;
2074 }
2075
2076 /*
2077 * Validation checks ([ADDRCONF], page 19)
2078 */
2079
2080 addr_type = ipv6_addr_type(&pinfo->prefix);
2081
2082 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2083 return;
2084
2085 valid_lft = ntohl(pinfo->valid);
2086 prefered_lft = ntohl(pinfo->prefered);
2087
2088 if (prefered_lft > valid_lft) {
2089 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2090 return;
2091 }
2092
2093 in6_dev = in6_dev_get(dev);
2094
2095 if (in6_dev == NULL) {
2096 net_dbg_ratelimited("addrconf: device %s not configured\n",
2097 dev->name);
2098 return;
2099 }
2100
2101 /*
2102 * Two things going on here:
2103 * 1) Add routes for on-link prefixes
2104 * 2) Configure prefixes with the auto flag set
2105 */
2106
2107 if (pinfo->onlink) {
2108 struct rt6_info *rt;
2109 unsigned long rt_expires;
2110
2111 /* Avoid arithmetic overflow. Really, we could
2112 * save rt_expires in seconds, likely valid_lft,
2113 * but it would require division in fib gc, that it
2114 * not good.
2115 */
2116 if (HZ > USER_HZ)
2117 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2118 else
2119 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2120
2121 if (addrconf_finite_timeout(rt_expires))
2122 rt_expires *= HZ;
2123
2124 rt = addrconf_get_prefix_route(&pinfo->prefix,
2125 pinfo->prefix_len,
2126 dev,
2127 RTF_ADDRCONF | RTF_PREFIX_RT,
2128 RTF_GATEWAY | RTF_DEFAULT);
2129
2130 if (rt) {
2131 /* Autoconf prefix route */
2132 if (valid_lft == 0) {
2133 ip6_del_rt(rt);
2134 rt = NULL;
2135 } else if (addrconf_finite_timeout(rt_expires)) {
2136 /* not infinity */
2137 rt6_set_expires(rt, jiffies + rt_expires);
2138 } else {
2139 rt6_clean_expires(rt);
2140 }
2141 } else if (valid_lft) {
2142 clock_t expires = 0;
2143 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2144 if (addrconf_finite_timeout(rt_expires)) {
2145 /* not infinity */
2146 flags |= RTF_EXPIRES;
2147 expires = jiffies_to_clock_t(rt_expires);
2148 }
2149 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2150 dev, expires, flags);
2151 }
2152 ip6_rt_put(rt);
2153 }
2154
2155 /* Try to figure out our local address for this prefix */
2156
2157 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2158 struct inet6_ifaddr *ifp;
2159 struct in6_addr addr;
2160 int create = 0, update_lft = 0;
2161 bool tokenized = false;
2162
2163 if (pinfo->prefix_len == 64) {
2164 memcpy(&addr, &pinfo->prefix, 8);
2165
2166 if (!ipv6_addr_any(&in6_dev->token)) {
2167 read_lock_bh(&in6_dev->lock);
2168 memcpy(addr.s6_addr + 8,
2169 in6_dev->token.s6_addr + 8, 8);
2170 read_unlock_bh(&in6_dev->lock);
2171 tokenized = true;
2172 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2173 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2174 in6_dev_put(in6_dev);
2175 return;
2176 }
2177 goto ok;
2178 }
2179 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2180 pinfo->prefix_len);
2181 in6_dev_put(in6_dev);
2182 return;
2183
2184 ok:
2185
2186 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2187
2188 if (ifp == NULL && valid_lft) {
2189 int max_addresses = in6_dev->cnf.max_addresses;
2190 u32 addr_flags = 0;
2191
2192 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2193 if (in6_dev->cnf.optimistic_dad &&
2194 !net->ipv6.devconf_all->forwarding && sllao)
2195 addr_flags = IFA_F_OPTIMISTIC;
2196 #endif
2197
2198 /* Do not allow to create too much of autoconfigured
2199 * addresses; this would be too easy way to crash kernel.
2200 */
2201 if (!max_addresses ||
2202 ipv6_count_addresses(in6_dev) < max_addresses)
2203 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2204 pinfo->prefix_len,
2205 addr_type&IPV6_ADDR_SCOPE_MASK,
2206 addr_flags, valid_lft,
2207 prefered_lft);
2208
2209 if (IS_ERR_OR_NULL(ifp)) {
2210 in6_dev_put(in6_dev);
2211 return;
2212 }
2213
2214 update_lft = 0;
2215 create = 1;
2216 ifp->cstamp = jiffies;
2217 ifp->tokenized = tokenized;
2218 addrconf_dad_start(ifp);
2219 }
2220
2221 if (ifp) {
2222 int flags;
2223 unsigned long now;
2224 #ifdef CONFIG_IPV6_PRIVACY
2225 struct inet6_ifaddr *ift;
2226 #endif
2227 u32 stored_lft;
2228
2229 /* update lifetime (RFC2462 5.5.3 e) */
2230 spin_lock(&ifp->lock);
2231 now = jiffies;
2232 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2233 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2234 else
2235 stored_lft = 0;
2236 if (!update_lft && !create && stored_lft) {
2237 if (valid_lft > MIN_VALID_LIFETIME ||
2238 valid_lft > stored_lft)
2239 update_lft = 1;
2240 else if (stored_lft <= MIN_VALID_LIFETIME) {
2241 /* valid_lft <= stored_lft is always true */
2242 /*
2243 * RFC 4862 Section 5.5.3e:
2244 * "Note that the preferred lifetime of
2245 * the corresponding address is always
2246 * reset to the Preferred Lifetime in
2247 * the received Prefix Information
2248 * option, regardless of whether the
2249 * valid lifetime is also reset or
2250 * ignored."
2251 *
2252 * So if the preferred lifetime in
2253 * this advertisement is different
2254 * than what we have stored, but the
2255 * valid lifetime is invalid, just
2256 * reset prefered_lft.
2257 *
2258 * We must set the valid lifetime
2259 * to the stored lifetime since we'll
2260 * be updating the timestamp below,
2261 * else we'll set it back to the
2262 * minimum.
2263 */
2264 if (prefered_lft != ifp->prefered_lft) {
2265 valid_lft = stored_lft;
2266 update_lft = 1;
2267 }
2268 } else {
2269 valid_lft = MIN_VALID_LIFETIME;
2270 if (valid_lft < prefered_lft)
2271 prefered_lft = valid_lft;
2272 update_lft = 1;
2273 }
2274 }
2275
2276 if (update_lft) {
2277 ifp->valid_lft = valid_lft;
2278 ifp->prefered_lft = prefered_lft;
2279 ifp->tstamp = now;
2280 flags = ifp->flags;
2281 ifp->flags &= ~IFA_F_DEPRECATED;
2282 spin_unlock(&ifp->lock);
2283
2284 if (!(flags&IFA_F_TENTATIVE))
2285 ipv6_ifa_notify(0, ifp);
2286 } else
2287 spin_unlock(&ifp->lock);
2288
2289 #ifdef CONFIG_IPV6_PRIVACY
2290 read_lock_bh(&in6_dev->lock);
2291 /* update all temporary addresses in the list */
2292 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2293 tmp_list) {
2294 int age, max_valid, max_prefered;
2295
2296 if (ifp != ift->ifpub)
2297 continue;
2298
2299 /*
2300 * RFC 4941 section 3.3:
2301 * If a received option will extend the lifetime
2302 * of a public address, the lifetimes of
2303 * temporary addresses should be extended,
2304 * subject to the overall constraint that no
2305 * temporary addresses should ever remain
2306 * "valid" or "preferred" for a time longer than
2307 * (TEMP_VALID_LIFETIME) or
2308 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2309 * respectively.
2310 */
2311 age = (now - ift->cstamp) / HZ;
2312 max_valid = in6_dev->cnf.temp_valid_lft - age;
2313 if (max_valid < 0)
2314 max_valid = 0;
2315
2316 max_prefered = in6_dev->cnf.temp_prefered_lft -
2317 in6_dev->cnf.max_desync_factor -
2318 age;
2319 if (max_prefered < 0)
2320 max_prefered = 0;
2321
2322 if (valid_lft > max_valid)
2323 valid_lft = max_valid;
2324
2325 if (prefered_lft > max_prefered)
2326 prefered_lft = max_prefered;
2327
2328 spin_lock(&ift->lock);
2329 flags = ift->flags;
2330 ift->valid_lft = valid_lft;
2331 ift->prefered_lft = prefered_lft;
2332 ift->tstamp = now;
2333 if (prefered_lft > 0)
2334 ift->flags &= ~IFA_F_DEPRECATED;
2335
2336 spin_unlock(&ift->lock);
2337 if (!(flags&IFA_F_TENTATIVE))
2338 ipv6_ifa_notify(0, ift);
2339 }
2340
2341 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2342 /*
2343 * When a new public address is created as
2344 * described in [ADDRCONF], also create a new
2345 * temporary address. Also create a temporary
2346 * address if it's enabled but no temporary
2347 * address currently exists.
2348 */
2349 read_unlock_bh(&in6_dev->lock);
2350 ipv6_create_tempaddr(ifp, NULL);
2351 } else {
2352 read_unlock_bh(&in6_dev->lock);
2353 }
2354 #endif
2355 in6_ifa_put(ifp);
2356 addrconf_verify(0);
2357 }
2358 }
2359 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2360 in6_dev_put(in6_dev);
2361 }
2362
2363 /*
2364 * Set destination address.
2365 * Special case for SIT interfaces where we create a new "virtual"
2366 * device.
2367 */
2368 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2369 {
2370 struct in6_ifreq ireq;
2371 struct net_device *dev;
2372 int err = -EINVAL;
2373
2374 rtnl_lock();
2375
2376 err = -EFAULT;
2377 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2378 goto err_exit;
2379
2380 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2381
2382 err = -ENODEV;
2383 if (dev == NULL)
2384 goto err_exit;
2385
2386 #if IS_ENABLED(CONFIG_IPV6_SIT)
2387 if (dev->type == ARPHRD_SIT) {
2388 const struct net_device_ops *ops = dev->netdev_ops;
2389 struct ifreq ifr;
2390 struct ip_tunnel_parm p;
2391
2392 err = -EADDRNOTAVAIL;
2393 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2394 goto err_exit;
2395
2396 memset(&p, 0, sizeof(p));
2397 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2398 p.iph.saddr = 0;
2399 p.iph.version = 4;
2400 p.iph.ihl = 5;
2401 p.iph.protocol = IPPROTO_IPV6;
2402 p.iph.ttl = 64;
2403 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2404
2405 if (ops->ndo_do_ioctl) {
2406 mm_segment_t oldfs = get_fs();
2407
2408 set_fs(KERNEL_DS);
2409 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2410 set_fs(oldfs);
2411 } else
2412 err = -EOPNOTSUPP;
2413
2414 if (err == 0) {
2415 err = -ENOBUFS;
2416 dev = __dev_get_by_name(net, p.name);
2417 if (!dev)
2418 goto err_exit;
2419 err = dev_open(dev);
2420 }
2421 }
2422 #endif
2423
2424 err_exit:
2425 rtnl_unlock();
2426 return err;
2427 }
2428
2429 /*
2430 * Manual configuration of address on an interface
2431 */
2432 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2433 const struct in6_addr *peer_pfx,
2434 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2435 __u32 valid_lft)
2436 {
2437 struct inet6_ifaddr *ifp;
2438 struct inet6_dev *idev;
2439 struct net_device *dev;
2440 int scope;
2441 u32 flags;
2442 clock_t expires;
2443 unsigned long timeout;
2444
2445 ASSERT_RTNL();
2446
2447 if (plen > 128)
2448 return -EINVAL;
2449
2450 /* check the lifetime */
2451 if (!valid_lft || prefered_lft > valid_lft)
2452 return -EINVAL;
2453
2454 dev = __dev_get_by_index(net, ifindex);
2455 if (!dev)
2456 return -ENODEV;
2457
2458 idev = addrconf_add_dev(dev);
2459 if (IS_ERR(idev))
2460 return PTR_ERR(idev);
2461
2462 scope = ipv6_addr_scope(pfx);
2463
2464 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2465 if (addrconf_finite_timeout(timeout)) {
2466 expires = jiffies_to_clock_t(timeout * HZ);
2467 valid_lft = timeout;
2468 flags = RTF_EXPIRES;
2469 } else {
2470 expires = 0;
2471 flags = 0;
2472 ifa_flags |= IFA_F_PERMANENT;
2473 }
2474
2475 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2476 if (addrconf_finite_timeout(timeout)) {
2477 if (timeout == 0)
2478 ifa_flags |= IFA_F_DEPRECATED;
2479 prefered_lft = timeout;
2480 }
2481
2482 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2483 valid_lft, prefered_lft);
2484
2485 if (!IS_ERR(ifp)) {
2486 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2487 expires, flags);
2488 /*
2489 * Note that section 3.1 of RFC 4429 indicates
2490 * that the Optimistic flag should not be set for
2491 * manually configured addresses
2492 */
2493 addrconf_dad_start(ifp);
2494 in6_ifa_put(ifp);
2495 addrconf_verify(0);
2496 return 0;
2497 }
2498
2499 return PTR_ERR(ifp);
2500 }
2501
2502 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2503 unsigned int plen)
2504 {
2505 struct inet6_ifaddr *ifp;
2506 struct inet6_dev *idev;
2507 struct net_device *dev;
2508
2509 if (plen > 128)
2510 return -EINVAL;
2511
2512 dev = __dev_get_by_index(net, ifindex);
2513 if (!dev)
2514 return -ENODEV;
2515
2516 if ((idev = __in6_dev_get(dev)) == NULL)
2517 return -ENXIO;
2518
2519 read_lock_bh(&idev->lock);
2520 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2521 if (ifp->prefix_len == plen &&
2522 ipv6_addr_equal(pfx, &ifp->addr)) {
2523 in6_ifa_hold(ifp);
2524 read_unlock_bh(&idev->lock);
2525
2526 ipv6_del_addr(ifp);
2527 return 0;
2528 }
2529 }
2530 read_unlock_bh(&idev->lock);
2531 return -EADDRNOTAVAIL;
2532 }
2533
2534
2535 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2536 {
2537 struct in6_ifreq ireq;
2538 int err;
2539
2540 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2541 return -EPERM;
2542
2543 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2544 return -EFAULT;
2545
2546 rtnl_lock();
2547 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2548 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2549 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2550 rtnl_unlock();
2551 return err;
2552 }
2553
2554 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2555 {
2556 struct in6_ifreq ireq;
2557 int err;
2558
2559 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2560 return -EPERM;
2561
2562 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2563 return -EFAULT;
2564
2565 rtnl_lock();
2566 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2567 ireq.ifr6_prefixlen);
2568 rtnl_unlock();
2569 return err;
2570 }
2571
2572 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2573 int plen, int scope)
2574 {
2575 struct inet6_ifaddr *ifp;
2576
2577 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2578 scope, IFA_F_PERMANENT, 0, 0);
2579 if (!IS_ERR(ifp)) {
2580 spin_lock_bh(&ifp->lock);
2581 ifp->flags &= ~IFA_F_TENTATIVE;
2582 spin_unlock_bh(&ifp->lock);
2583 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2584 in6_ifa_put(ifp);
2585 }
2586 }
2587
2588 #if IS_ENABLED(CONFIG_IPV6_SIT)
2589 static void sit_add_v4_addrs(struct inet6_dev *idev)
2590 {
2591 struct in6_addr addr;
2592 struct net_device *dev;
2593 struct net *net = dev_net(idev->dev);
2594 int scope;
2595
2596 ASSERT_RTNL();
2597
2598 memset(&addr, 0, sizeof(struct in6_addr));
2599 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2600
2601 if (idev->dev->flags&IFF_POINTOPOINT) {
2602 addr.s6_addr32[0] = htonl(0xfe800000);
2603 scope = IFA_LINK;
2604 } else {
2605 scope = IPV6_ADDR_COMPATv4;
2606 }
2607
2608 if (addr.s6_addr32[3]) {
2609 add_addr(idev, &addr, 128, scope);
2610 return;
2611 }
2612
2613 for_each_netdev(net, dev) {
2614 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2615 if (in_dev && (dev->flags & IFF_UP)) {
2616 struct in_ifaddr *ifa;
2617
2618 int flag = scope;
2619
2620 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2621 int plen;
2622
2623 addr.s6_addr32[3] = ifa->ifa_local;
2624
2625 if (ifa->ifa_scope == RT_SCOPE_LINK)
2626 continue;
2627 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2628 if (idev->dev->flags&IFF_POINTOPOINT)
2629 continue;
2630 flag |= IFA_HOST;
2631 }
2632 if (idev->dev->flags&IFF_POINTOPOINT)
2633 plen = 64;
2634 else
2635 plen = 96;
2636
2637 add_addr(idev, &addr, plen, flag);
2638 }
2639 }
2640 }
2641 }
2642 #endif
2643
2644 static void init_loopback(struct net_device *dev)
2645 {
2646 struct inet6_dev *idev;
2647 struct net_device *sp_dev;
2648 struct inet6_ifaddr *sp_ifa;
2649 struct rt6_info *sp_rt;
2650
2651 /* ::1 */
2652
2653 ASSERT_RTNL();
2654
2655 if ((idev = ipv6_find_idev(dev)) == NULL) {
2656 pr_debug("%s: add_dev failed\n", __func__);
2657 return;
2658 }
2659
2660 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2661
2662 /* Add routes to other interface's IPv6 addresses */
2663 for_each_netdev(dev_net(dev), sp_dev) {
2664 if (!strcmp(sp_dev->name, dev->name))
2665 continue;
2666
2667 idev = __in6_dev_get(sp_dev);
2668 if (!idev)
2669 continue;
2670
2671 read_lock_bh(&idev->lock);
2672 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2673
2674 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2675 continue;
2676
2677 if (sp_ifa->rt)
2678 continue;
2679
2680 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2681
2682 /* Failure cases are ignored */
2683 if (!IS_ERR(sp_rt)) {
2684 sp_ifa->rt = sp_rt;
2685 ip6_ins_rt(sp_rt);
2686 }
2687 }
2688 read_unlock_bh(&idev->lock);
2689 }
2690 }
2691
2692 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2693 {
2694 struct inet6_ifaddr *ifp;
2695 u32 addr_flags = IFA_F_PERMANENT;
2696
2697 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2698 if (idev->cnf.optimistic_dad &&
2699 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2700 addr_flags |= IFA_F_OPTIMISTIC;
2701 #endif
2702
2703
2704 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
2705 if (!IS_ERR(ifp)) {
2706 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2707 addrconf_dad_start(ifp);
2708 in6_ifa_put(ifp);
2709 }
2710 }
2711
2712 static void addrconf_dev_config(struct net_device *dev)
2713 {
2714 struct in6_addr addr;
2715 struct inet6_dev *idev;
2716
2717 ASSERT_RTNL();
2718
2719 if ((dev->type != ARPHRD_ETHER) &&
2720 (dev->type != ARPHRD_FDDI) &&
2721 (dev->type != ARPHRD_ARCNET) &&
2722 (dev->type != ARPHRD_INFINIBAND) &&
2723 (dev->type != ARPHRD_IEEE802154) &&
2724 (dev->type != ARPHRD_IEEE1394) &&
2725 (dev->type != ARPHRD_TUNNEL6)) {
2726 /* Alas, we support only Ethernet autoconfiguration. */
2727 return;
2728 }
2729
2730 idev = addrconf_add_dev(dev);
2731 if (IS_ERR(idev))
2732 return;
2733
2734 memset(&addr, 0, sizeof(struct in6_addr));
2735 addr.s6_addr32[0] = htonl(0xFE800000);
2736
2737 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2738 addrconf_add_linklocal(idev, &addr);
2739 }
2740
2741 #if IS_ENABLED(CONFIG_IPV6_SIT)
2742 static void addrconf_sit_config(struct net_device *dev)
2743 {
2744 struct inet6_dev *idev;
2745
2746 ASSERT_RTNL();
2747
2748 /*
2749 * Configure the tunnel with one of our IPv4
2750 * addresses... we should configure all of
2751 * our v4 addrs in the tunnel
2752 */
2753
2754 if ((idev = ipv6_find_idev(dev)) == NULL) {
2755 pr_debug("%s: add_dev failed\n", __func__);
2756 return;
2757 }
2758
2759 if (dev->priv_flags & IFF_ISATAP) {
2760 struct in6_addr addr;
2761
2762 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2763 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2764 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2765 addrconf_add_linklocal(idev, &addr);
2766 return;
2767 }
2768
2769 sit_add_v4_addrs(idev);
2770
2771 if (dev->flags&IFF_POINTOPOINT)
2772 addrconf_add_mroute(dev);
2773 else
2774 sit_route_add(dev);
2775 }
2776 #endif
2777
2778 #if IS_ENABLED(CONFIG_NET_IPGRE)
2779 static void addrconf_gre_config(struct net_device *dev)
2780 {
2781 struct inet6_dev *idev;
2782 struct in6_addr addr;
2783
2784 ASSERT_RTNL();
2785
2786 if ((idev = ipv6_find_idev(dev)) == NULL) {
2787 pr_debug("%s: add_dev failed\n", __func__);
2788 return;
2789 }
2790
2791 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2792 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2793
2794 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2795 addrconf_add_linklocal(idev, &addr);
2796 }
2797 #endif
2798
2799 static inline int
2800 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2801 {
2802 struct in6_addr lladdr;
2803
2804 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2805 addrconf_add_linklocal(idev, &lladdr);
2806 return 0;
2807 }
2808 return -1;
2809 }
2810
2811 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2812 void *ptr)
2813 {
2814 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2815 struct inet6_dev *idev = __in6_dev_get(dev);
2816 int run_pending = 0;
2817 int err;
2818
2819 switch (event) {
2820 case NETDEV_REGISTER:
2821 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2822 idev = ipv6_add_dev(dev);
2823 if (!idev)
2824 return notifier_from_errno(-ENOMEM);
2825 }
2826 break;
2827
2828 case NETDEV_UP:
2829 case NETDEV_CHANGE:
2830 if (dev->flags & IFF_SLAVE)
2831 break;
2832
2833 if (event == NETDEV_UP) {
2834 if (!addrconf_qdisc_ok(dev)) {
2835 /* device is not ready yet. */
2836 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2837 dev->name);
2838 break;
2839 }
2840
2841 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2842 idev = ipv6_add_dev(dev);
2843
2844 if (idev) {
2845 idev->if_flags |= IF_READY;
2846 run_pending = 1;
2847 }
2848 } else {
2849 if (!addrconf_qdisc_ok(dev)) {
2850 /* device is still not ready. */
2851 break;
2852 }
2853
2854 if (idev) {
2855 if (idev->if_flags & IF_READY)
2856 /* device is already configured. */
2857 break;
2858 idev->if_flags |= IF_READY;
2859 }
2860
2861 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2862 dev->name);
2863
2864 run_pending = 1;
2865 }
2866
2867 switch (dev->type) {
2868 #if IS_ENABLED(CONFIG_IPV6_SIT)
2869 case ARPHRD_SIT:
2870 addrconf_sit_config(dev);
2871 break;
2872 #endif
2873 #if IS_ENABLED(CONFIG_NET_IPGRE)
2874 case ARPHRD_IPGRE:
2875 addrconf_gre_config(dev);
2876 break;
2877 #endif
2878 case ARPHRD_LOOPBACK:
2879 init_loopback(dev);
2880 break;
2881
2882 default:
2883 addrconf_dev_config(dev);
2884 break;
2885 }
2886
2887 if (idev) {
2888 if (run_pending)
2889 addrconf_dad_run(idev);
2890
2891 /*
2892 * If the MTU changed during the interface down,
2893 * when the interface up, the changed MTU must be
2894 * reflected in the idev as well as routers.
2895 */
2896 if (idev->cnf.mtu6 != dev->mtu &&
2897 dev->mtu >= IPV6_MIN_MTU) {
2898 rt6_mtu_change(dev, dev->mtu);
2899 idev->cnf.mtu6 = dev->mtu;
2900 }
2901 idev->tstamp = jiffies;
2902 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2903
2904 /*
2905 * If the changed mtu during down is lower than
2906 * IPV6_MIN_MTU stop IPv6 on this interface.
2907 */
2908 if (dev->mtu < IPV6_MIN_MTU)
2909 addrconf_ifdown(dev, 1);
2910 }
2911 break;
2912
2913 case NETDEV_CHANGEMTU:
2914 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2915 rt6_mtu_change(dev, dev->mtu);
2916 idev->cnf.mtu6 = dev->mtu;
2917 break;
2918 }
2919
2920 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2921 idev = ipv6_add_dev(dev);
2922 if (idev)
2923 break;
2924 }
2925
2926 /*
2927 * MTU falled under IPV6_MIN_MTU.
2928 * Stop IPv6 on this interface.
2929 */
2930
2931 case NETDEV_DOWN:
2932 case NETDEV_UNREGISTER:
2933 /*
2934 * Remove all addresses from this interface.
2935 */
2936 addrconf_ifdown(dev, event != NETDEV_DOWN);
2937 break;
2938
2939 case NETDEV_CHANGENAME:
2940 if (idev) {
2941 snmp6_unregister_dev(idev);
2942 addrconf_sysctl_unregister(idev);
2943 addrconf_sysctl_register(idev);
2944 err = snmp6_register_dev(idev);
2945 if (err)
2946 return notifier_from_errno(err);
2947 }
2948 break;
2949
2950 case NETDEV_PRE_TYPE_CHANGE:
2951 case NETDEV_POST_TYPE_CHANGE:
2952 addrconf_type_change(dev, event);
2953 break;
2954 }
2955
2956 return NOTIFY_OK;
2957 }
2958
2959 /*
2960 * addrconf module should be notified of a device going up
2961 */
2962 static struct notifier_block ipv6_dev_notf = {
2963 .notifier_call = addrconf_notify,
2964 };
2965
2966 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2967 {
2968 struct inet6_dev *idev;
2969 ASSERT_RTNL();
2970
2971 idev = __in6_dev_get(dev);
2972
2973 if (event == NETDEV_POST_TYPE_CHANGE)
2974 ipv6_mc_remap(idev);
2975 else if (event == NETDEV_PRE_TYPE_CHANGE)
2976 ipv6_mc_unmap(idev);
2977 }
2978
2979 static int addrconf_ifdown(struct net_device *dev, int how)
2980 {
2981 struct net *net = dev_net(dev);
2982 struct inet6_dev *idev;
2983 struct inet6_ifaddr *ifa;
2984 int state, i;
2985
2986 ASSERT_RTNL();
2987
2988 rt6_ifdown(net, dev);
2989 neigh_ifdown(&nd_tbl, dev);
2990
2991 idev = __in6_dev_get(dev);
2992 if (idev == NULL)
2993 return -ENODEV;
2994
2995 /*
2996 * Step 1: remove reference to ipv6 device from parent device.
2997 * Do not dev_put!
2998 */
2999 if (how) {
3000 idev->dead = 1;
3001
3002 /* protected by rtnl_lock */
3003 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3004
3005 /* Step 1.5: remove snmp6 entry */
3006 snmp6_unregister_dev(idev);
3007
3008 }
3009
3010 /* Step 2: clear hash table */
3011 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3012 struct hlist_head *h = &inet6_addr_lst[i];
3013
3014 spin_lock_bh(&addrconf_hash_lock);
3015 restart:
3016 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3017 if (ifa->idev == idev) {
3018 hlist_del_init_rcu(&ifa->addr_lst);
3019 addrconf_del_dad_timer(ifa);
3020 goto restart;
3021 }
3022 }
3023 spin_unlock_bh(&addrconf_hash_lock);
3024 }
3025
3026 write_lock_bh(&idev->lock);
3027
3028 addrconf_del_rs_timer(idev);
3029
3030 /* Step 2: clear flags for stateless addrconf */
3031 if (!how)
3032 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3033
3034 #ifdef CONFIG_IPV6_PRIVACY
3035 if (how && del_timer(&idev->regen_timer))
3036 in6_dev_put(idev);
3037
3038 /* Step 3: clear tempaddr list */
3039 while (!list_empty(&idev->tempaddr_list)) {
3040 ifa = list_first_entry(&idev->tempaddr_list,
3041 struct inet6_ifaddr, tmp_list);
3042 list_del(&ifa->tmp_list);
3043 write_unlock_bh(&idev->lock);
3044 spin_lock_bh(&ifa->lock);
3045
3046 if (ifa->ifpub) {
3047 in6_ifa_put(ifa->ifpub);
3048 ifa->ifpub = NULL;
3049 }
3050 spin_unlock_bh(&ifa->lock);
3051 in6_ifa_put(ifa);
3052 write_lock_bh(&idev->lock);
3053 }
3054 #endif
3055
3056 while (!list_empty(&idev->addr_list)) {
3057 ifa = list_first_entry(&idev->addr_list,
3058 struct inet6_ifaddr, if_list);
3059 addrconf_del_dad_timer(ifa);
3060
3061 list_del(&ifa->if_list);
3062
3063 write_unlock_bh(&idev->lock);
3064
3065 spin_lock_bh(&ifa->state_lock);
3066 state = ifa->state;
3067 ifa->state = INET6_IFADDR_STATE_DEAD;
3068 spin_unlock_bh(&ifa->state_lock);
3069
3070 if (state != INET6_IFADDR_STATE_DEAD) {
3071 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3072 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3073 }
3074 in6_ifa_put(ifa);
3075
3076 write_lock_bh(&idev->lock);
3077 }
3078
3079 write_unlock_bh(&idev->lock);
3080
3081 /* Step 5: Discard multicast list */
3082 if (how)
3083 ipv6_mc_destroy_dev(idev);
3084 else
3085 ipv6_mc_down(idev);
3086
3087 idev->tstamp = jiffies;
3088
3089 /* Last: Shot the device (if unregistered) */
3090 if (how) {
3091 addrconf_sysctl_unregister(idev);
3092 neigh_parms_release(&nd_tbl, idev->nd_parms);
3093 neigh_ifdown(&nd_tbl, dev);
3094 in6_dev_put(idev);
3095 }
3096 return 0;
3097 }
3098
3099 static void addrconf_rs_timer(unsigned long data)
3100 {
3101 struct inet6_dev *idev = (struct inet6_dev *)data;
3102 struct in6_addr lladdr;
3103
3104 write_lock(&idev->lock);
3105 if (idev->dead || !(idev->if_flags & IF_READY))
3106 goto out;
3107
3108 if (!ipv6_accept_ra(idev))
3109 goto out;
3110
3111 /* Announcement received after solicitation was sent */
3112 if (idev->if_flags & IF_RA_RCVD)
3113 goto out;
3114
3115 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3116 if (!__ipv6_get_lladdr(idev, &lladdr, IFA_F_TENTATIVE))
3117 ndisc_send_rs(idev->dev, &lladdr,
3118 &in6addr_linklocal_allrouters);
3119 else
3120 goto out;
3121
3122 /* The wait after the last probe can be shorter */
3123 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3124 idev->cnf.rtr_solicits) ?
3125 idev->cnf.rtr_solicit_delay :
3126 idev->cnf.rtr_solicit_interval);
3127 } else {
3128 /*
3129 * Note: we do not support deprecated "all on-link"
3130 * assumption any longer.
3131 */
3132 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3133 }
3134
3135 out:
3136 write_unlock(&idev->lock);
3137 in6_dev_put(idev);
3138 }
3139
3140 /*
3141 * Duplicate Address Detection
3142 */
3143 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3144 {
3145 unsigned long rand_num;
3146 struct inet6_dev *idev = ifp->idev;
3147
3148 if (ifp->flags & IFA_F_OPTIMISTIC)
3149 rand_num = 0;
3150 else
3151 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3152
3153 ifp->dad_probes = idev->cnf.dad_transmits;
3154 addrconf_mod_dad_timer(ifp, rand_num);
3155 }
3156
3157 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3158 {
3159 struct inet6_dev *idev = ifp->idev;
3160 struct net_device *dev = idev->dev;
3161
3162 addrconf_join_solict(dev, &ifp->addr);
3163
3164 net_srandom(ifp->addr.s6_addr32[3]);
3165
3166 read_lock_bh(&idev->lock);
3167 spin_lock(&ifp->lock);
3168 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3169 goto out;
3170
3171 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3172 idev->cnf.accept_dad < 1 ||
3173 !(ifp->flags&IFA_F_TENTATIVE) ||
3174 ifp->flags & IFA_F_NODAD) {
3175 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3176 spin_unlock(&ifp->lock);
3177 read_unlock_bh(&idev->lock);
3178
3179 addrconf_dad_completed(ifp);
3180 return;
3181 }
3182
3183 if (!(idev->if_flags & IF_READY)) {
3184 spin_unlock(&ifp->lock);
3185 read_unlock_bh(&idev->lock);
3186 /*
3187 * If the device is not ready:
3188 * - keep it tentative if it is a permanent address.
3189 * - otherwise, kill it.
3190 */
3191 in6_ifa_hold(ifp);
3192 addrconf_dad_stop(ifp, 0);
3193 return;
3194 }
3195
3196 /*
3197 * Optimistic nodes can start receiving
3198 * Frames right away
3199 */
3200 if (ifp->flags & IFA_F_OPTIMISTIC)
3201 ip6_ins_rt(ifp->rt);
3202
3203 addrconf_dad_kick(ifp);
3204 out:
3205 spin_unlock(&ifp->lock);
3206 read_unlock_bh(&idev->lock);
3207 }
3208
3209 static void addrconf_dad_timer(unsigned long data)
3210 {
3211 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3212 struct inet6_dev *idev = ifp->idev;
3213 struct in6_addr mcaddr;
3214
3215 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3216 goto out;
3217
3218 write_lock(&idev->lock);
3219 if (idev->dead || !(idev->if_flags & IF_READY)) {
3220 write_unlock(&idev->lock);
3221 goto out;
3222 }
3223
3224 spin_lock(&ifp->lock);
3225 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3226 spin_unlock(&ifp->lock);
3227 write_unlock(&idev->lock);
3228 goto out;
3229 }
3230
3231 if (ifp->dad_probes == 0) {
3232 /*
3233 * DAD was successful
3234 */
3235
3236 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3237 spin_unlock(&ifp->lock);
3238 write_unlock(&idev->lock);
3239
3240 addrconf_dad_completed(ifp);
3241
3242 goto out;
3243 }
3244
3245 ifp->dad_probes--;
3246 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3247 spin_unlock(&ifp->lock);
3248 write_unlock(&idev->lock);
3249
3250 /* send a neighbour solicitation for our addr */
3251 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3252 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3253 out:
3254 in6_ifa_put(ifp);
3255 }
3256
3257 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3258 {
3259 struct net_device *dev = ifp->idev->dev;
3260 struct in6_addr lladdr;
3261 bool send_rs, send_mld;
3262
3263 addrconf_del_dad_timer(ifp);
3264
3265 /*
3266 * Configure the address for reception. Now it is valid.
3267 */
3268
3269 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3270
3271 /* If added prefix is link local and we are prepared to process
3272 router advertisements, start sending router solicitations.
3273 */
3274
3275 read_lock_bh(&ifp->idev->lock);
3276 spin_lock(&ifp->lock);
3277 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3278 ifp->idev->valid_ll_addr_cnt == 1;
3279 send_rs = send_mld &&
3280 ipv6_accept_ra(ifp->idev) &&
3281 ifp->idev->cnf.rtr_solicits > 0 &&
3282 (dev->flags&IFF_LOOPBACK) == 0;
3283 spin_unlock(&ifp->lock);
3284 read_unlock_bh(&ifp->idev->lock);
3285
3286 /* While dad is in progress mld report's source address is in6_addrany.
3287 * Resend with proper ll now.
3288 */
3289 if (send_mld)
3290 ipv6_mc_dad_complete(ifp->idev);
3291
3292 if (send_rs) {
3293 /*
3294 * If a host as already performed a random delay
3295 * [...] as part of DAD [...] there is no need
3296 * to delay again before sending the first RS
3297 */
3298 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3299 return;
3300 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3301
3302 write_lock_bh(&ifp->idev->lock);
3303 spin_lock(&ifp->lock);
3304 ifp->idev->rs_probes = 1;
3305 ifp->idev->if_flags |= IF_RS_SENT;
3306 addrconf_mod_rs_timer(ifp->idev,
3307 ifp->idev->cnf.rtr_solicit_interval);
3308 spin_unlock(&ifp->lock);
3309 write_unlock_bh(&ifp->idev->lock);
3310 }
3311 }
3312
3313 static void addrconf_dad_run(struct inet6_dev *idev)
3314 {
3315 struct inet6_ifaddr *ifp;
3316
3317 read_lock_bh(&idev->lock);
3318 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3319 spin_lock(&ifp->lock);
3320 if (ifp->flags & IFA_F_TENTATIVE &&
3321 ifp->state == INET6_IFADDR_STATE_DAD)
3322 addrconf_dad_kick(ifp);
3323 spin_unlock(&ifp->lock);
3324 }
3325 read_unlock_bh(&idev->lock);
3326 }
3327
3328 #ifdef CONFIG_PROC_FS
3329 struct if6_iter_state {
3330 struct seq_net_private p;
3331 int bucket;
3332 int offset;
3333 };
3334
3335 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3336 {
3337 struct inet6_ifaddr *ifa = NULL;
3338 struct if6_iter_state *state = seq->private;
3339 struct net *net = seq_file_net(seq);
3340 int p = 0;
3341
3342 /* initial bucket if pos is 0 */
3343 if (pos == 0) {
3344 state->bucket = 0;
3345 state->offset = 0;
3346 }
3347
3348 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3349 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3350 addr_lst) {
3351 if (!net_eq(dev_net(ifa->idev->dev), net))
3352 continue;
3353 /* sync with offset */
3354 if (p < state->offset) {
3355 p++;
3356 continue;
3357 }
3358 state->offset++;
3359 return ifa;
3360 }
3361
3362 /* prepare for next bucket */
3363 state->offset = 0;
3364 p = 0;
3365 }
3366 return NULL;
3367 }
3368
3369 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3370 struct inet6_ifaddr *ifa)
3371 {
3372 struct if6_iter_state *state = seq->private;
3373 struct net *net = seq_file_net(seq);
3374
3375 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3376 if (!net_eq(dev_net(ifa->idev->dev), net))
3377 continue;
3378 state->offset++;
3379 return ifa;
3380 }
3381
3382 while (++state->bucket < IN6_ADDR_HSIZE) {
3383 state->offset = 0;
3384 hlist_for_each_entry_rcu_bh(ifa,
3385 &inet6_addr_lst[state->bucket], addr_lst) {
3386 if (!net_eq(dev_net(ifa->idev->dev), net))
3387 continue;
3388 state->offset++;
3389 return ifa;
3390 }
3391 }
3392
3393 return NULL;
3394 }
3395
3396 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3397 __acquires(rcu_bh)
3398 {
3399 rcu_read_lock_bh();
3400 return if6_get_first(seq, *pos);
3401 }
3402
3403 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3404 {
3405 struct inet6_ifaddr *ifa;
3406
3407 ifa = if6_get_next(seq, v);
3408 ++*pos;
3409 return ifa;
3410 }
3411
3412 static void if6_seq_stop(struct seq_file *seq, void *v)
3413 __releases(rcu_bh)
3414 {
3415 rcu_read_unlock_bh();
3416 }
3417
3418 static int if6_seq_show(struct seq_file *seq, void *v)
3419 {
3420 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3421 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3422 &ifp->addr,
3423 ifp->idev->dev->ifindex,
3424 ifp->prefix_len,
3425 ifp->scope,
3426 ifp->flags,
3427 ifp->idev->dev->name);
3428 return 0;
3429 }
3430
3431 static const struct seq_operations if6_seq_ops = {
3432 .start = if6_seq_start,
3433 .next = if6_seq_next,
3434 .show = if6_seq_show,
3435 .stop = if6_seq_stop,
3436 };
3437
3438 static int if6_seq_open(struct inode *inode, struct file *file)
3439 {
3440 return seq_open_net(inode, file, &if6_seq_ops,
3441 sizeof(struct if6_iter_state));
3442 }
3443
3444 static const struct file_operations if6_fops = {
3445 .owner = THIS_MODULE,
3446 .open = if6_seq_open,
3447 .read = seq_read,
3448 .llseek = seq_lseek,
3449 .release = seq_release_net,
3450 };
3451
3452 static int __net_init if6_proc_net_init(struct net *net)
3453 {
3454 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3455 return -ENOMEM;
3456 return 0;
3457 }
3458
3459 static void __net_exit if6_proc_net_exit(struct net *net)
3460 {
3461 remove_proc_entry("if_inet6", net->proc_net);
3462 }
3463
3464 static struct pernet_operations if6_proc_net_ops = {
3465 .init = if6_proc_net_init,
3466 .exit = if6_proc_net_exit,
3467 };
3468
3469 int __init if6_proc_init(void)
3470 {
3471 return register_pernet_subsys(&if6_proc_net_ops);
3472 }
3473
3474 void if6_proc_exit(void)
3475 {
3476 unregister_pernet_subsys(&if6_proc_net_ops);
3477 }
3478 #endif /* CONFIG_PROC_FS */
3479
3480 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3481 /* Check if address is a home address configured on any interface. */
3482 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3483 {
3484 int ret = 0;
3485 struct inet6_ifaddr *ifp = NULL;
3486 unsigned int hash = inet6_addr_hash(addr);
3487
3488 rcu_read_lock_bh();
3489 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3490 if (!net_eq(dev_net(ifp->idev->dev), net))
3491 continue;
3492 if (ipv6_addr_equal(&ifp->addr, addr) &&
3493 (ifp->flags & IFA_F_HOMEADDRESS)) {
3494 ret = 1;
3495 break;
3496 }
3497 }
3498 rcu_read_unlock_bh();
3499 return ret;
3500 }
3501 #endif
3502
3503 /*
3504 * Periodic address status verification
3505 */
3506
3507 static void addrconf_verify(unsigned long foo)
3508 {
3509 unsigned long now, next, next_sec, next_sched;
3510 struct inet6_ifaddr *ifp;
3511 int i;
3512
3513 rcu_read_lock_bh();
3514 spin_lock(&addrconf_verify_lock);
3515 now = jiffies;
3516 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3517
3518 del_timer(&addr_chk_timer);
3519
3520 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3521 restart:
3522 hlist_for_each_entry_rcu_bh(ifp,
3523 &inet6_addr_lst[i], addr_lst) {
3524 unsigned long age;
3525
3526 if (ifp->flags & IFA_F_PERMANENT)
3527 continue;
3528
3529 spin_lock(&ifp->lock);
3530 /* We try to batch several events at once. */
3531 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3532
3533 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3534 age >= ifp->valid_lft) {
3535 spin_unlock(&ifp->lock);
3536 in6_ifa_hold(ifp);
3537 ipv6_del_addr(ifp);
3538 goto restart;
3539 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3540 spin_unlock(&ifp->lock);
3541 continue;
3542 } else if (age >= ifp->prefered_lft) {
3543 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3544 int deprecate = 0;
3545
3546 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3547 deprecate = 1;
3548 ifp->flags |= IFA_F_DEPRECATED;
3549 }
3550
3551 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3552 next = ifp->tstamp + ifp->valid_lft * HZ;
3553
3554 spin_unlock(&ifp->lock);
3555
3556 if (deprecate) {
3557 in6_ifa_hold(ifp);
3558
3559 ipv6_ifa_notify(0, ifp);
3560 in6_ifa_put(ifp);
3561 goto restart;
3562 }
3563 #ifdef CONFIG_IPV6_PRIVACY
3564 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3565 !(ifp->flags&IFA_F_TENTATIVE)) {
3566 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3567 ifp->idev->cnf.dad_transmits *
3568 ifp->idev->nd_parms->retrans_time / HZ;
3569
3570 if (age >= ifp->prefered_lft - regen_advance) {
3571 struct inet6_ifaddr *ifpub = ifp->ifpub;
3572 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3573 next = ifp->tstamp + ifp->prefered_lft * HZ;
3574 if (!ifp->regen_count && ifpub) {
3575 ifp->regen_count++;
3576 in6_ifa_hold(ifp);
3577 in6_ifa_hold(ifpub);
3578 spin_unlock(&ifp->lock);
3579
3580 spin_lock(&ifpub->lock);
3581 ifpub->regen_count = 0;
3582 spin_unlock(&ifpub->lock);
3583 ipv6_create_tempaddr(ifpub, ifp);
3584 in6_ifa_put(ifpub);
3585 in6_ifa_put(ifp);
3586 goto restart;
3587 }
3588 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3589 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3590 spin_unlock(&ifp->lock);
3591 #endif
3592 } else {
3593 /* ifp->prefered_lft <= ifp->valid_lft */
3594 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3595 next = ifp->tstamp + ifp->prefered_lft * HZ;
3596 spin_unlock(&ifp->lock);
3597 }
3598 }
3599 }
3600
3601 next_sec = round_jiffies_up(next);
3602 next_sched = next;
3603
3604 /* If rounded timeout is accurate enough, accept it. */
3605 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3606 next_sched = next_sec;
3607
3608 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3609 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3610 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3611
3612 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3613 now, next, next_sec, next_sched);
3614
3615 addr_chk_timer.expires = next_sched;
3616 add_timer(&addr_chk_timer);
3617 spin_unlock(&addrconf_verify_lock);
3618 rcu_read_unlock_bh();
3619 }
3620
3621 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3622 struct in6_addr **peer_pfx)
3623 {
3624 struct in6_addr *pfx = NULL;
3625
3626 *peer_pfx = NULL;
3627
3628 if (addr)
3629 pfx = nla_data(addr);
3630
3631 if (local) {
3632 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3633 *peer_pfx = pfx;
3634 pfx = nla_data(local);
3635 }
3636
3637 return pfx;
3638 }
3639
3640 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3641 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3642 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3643 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3644 };
3645
3646 static int
3647 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3648 {
3649 struct net *net = sock_net(skb->sk);
3650 struct ifaddrmsg *ifm;
3651 struct nlattr *tb[IFA_MAX+1];
3652 struct in6_addr *pfx, *peer_pfx;
3653 int err;
3654
3655 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3656 if (err < 0)
3657 return err;
3658
3659 ifm = nlmsg_data(nlh);
3660 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3661 if (pfx == NULL)
3662 return -EINVAL;
3663
3664 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3665 }
3666
3667 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3668 u32 prefered_lft, u32 valid_lft)
3669 {
3670 u32 flags;
3671 clock_t expires;
3672 unsigned long timeout;
3673
3674 if (!valid_lft || (prefered_lft > valid_lft))
3675 return -EINVAL;
3676
3677 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3678 if (addrconf_finite_timeout(timeout)) {
3679 expires = jiffies_to_clock_t(timeout * HZ);
3680 valid_lft = timeout;
3681 flags = RTF_EXPIRES;
3682 } else {
3683 expires = 0;
3684 flags = 0;
3685 ifa_flags |= IFA_F_PERMANENT;
3686 }
3687
3688 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3689 if (addrconf_finite_timeout(timeout)) {
3690 if (timeout == 0)
3691 ifa_flags |= IFA_F_DEPRECATED;
3692 prefered_lft = timeout;
3693 }
3694
3695 spin_lock_bh(&ifp->lock);
3696 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3697 ifp->tstamp = jiffies;
3698 ifp->valid_lft = valid_lft;
3699 ifp->prefered_lft = prefered_lft;
3700
3701 spin_unlock_bh(&ifp->lock);
3702 if (!(ifp->flags&IFA_F_TENTATIVE))
3703 ipv6_ifa_notify(0, ifp);
3704
3705 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3706 expires, flags);
3707 addrconf_verify(0);
3708
3709 return 0;
3710 }
3711
3712 static int
3713 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3714 {
3715 struct net *net = sock_net(skb->sk);
3716 struct ifaddrmsg *ifm;
3717 struct nlattr *tb[IFA_MAX+1];
3718 struct in6_addr *pfx, *peer_pfx;
3719 struct inet6_ifaddr *ifa;
3720 struct net_device *dev;
3721 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3722 u8 ifa_flags;
3723 int err;
3724
3725 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3726 if (err < 0)
3727 return err;
3728
3729 ifm = nlmsg_data(nlh);
3730 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3731 if (pfx == NULL)
3732 return -EINVAL;
3733
3734 if (tb[IFA_CACHEINFO]) {
3735 struct ifa_cacheinfo *ci;
3736
3737 ci = nla_data(tb[IFA_CACHEINFO]);
3738 valid_lft = ci->ifa_valid;
3739 preferred_lft = ci->ifa_prefered;
3740 } else {
3741 preferred_lft = INFINITY_LIFE_TIME;
3742 valid_lft = INFINITY_LIFE_TIME;
3743 }
3744
3745 dev = __dev_get_by_index(net, ifm->ifa_index);
3746 if (dev == NULL)
3747 return -ENODEV;
3748
3749 /* We ignore other flags so far. */
3750 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3751
3752 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3753 if (ifa == NULL) {
3754 /*
3755 * It would be best to check for !NLM_F_CREATE here but
3756 * userspace alreay relies on not having to provide this.
3757 */
3758 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3759 ifm->ifa_prefixlen, ifa_flags,
3760 preferred_lft, valid_lft);
3761 }
3762
3763 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3764 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3765 err = -EEXIST;
3766 else
3767 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3768
3769 in6_ifa_put(ifa);
3770
3771 return err;
3772 }
3773
3774 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3775 u8 scope, int ifindex)
3776 {
3777 struct ifaddrmsg *ifm;
3778
3779 ifm = nlmsg_data(nlh);
3780 ifm->ifa_family = AF_INET6;
3781 ifm->ifa_prefixlen = prefixlen;
3782 ifm->ifa_flags = flags;
3783 ifm->ifa_scope = scope;
3784 ifm->ifa_index = ifindex;
3785 }
3786
3787 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3788 unsigned long tstamp, u32 preferred, u32 valid)
3789 {
3790 struct ifa_cacheinfo ci;
3791
3792 ci.cstamp = cstamp_delta(cstamp);
3793 ci.tstamp = cstamp_delta(tstamp);
3794 ci.ifa_prefered = preferred;
3795 ci.ifa_valid = valid;
3796
3797 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3798 }
3799
3800 static inline int rt_scope(int ifa_scope)
3801 {
3802 if (ifa_scope & IFA_HOST)
3803 return RT_SCOPE_HOST;
3804 else if (ifa_scope & IFA_LINK)
3805 return RT_SCOPE_LINK;
3806 else if (ifa_scope & IFA_SITE)
3807 return RT_SCOPE_SITE;
3808 else
3809 return RT_SCOPE_UNIVERSE;
3810 }
3811
3812 static inline int inet6_ifaddr_msgsize(void)
3813 {
3814 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3815 + nla_total_size(16) /* IFA_LOCAL */
3816 + nla_total_size(16) /* IFA_ADDRESS */
3817 + nla_total_size(sizeof(struct ifa_cacheinfo));
3818 }
3819
3820 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3821 u32 portid, u32 seq, int event, unsigned int flags)
3822 {
3823 struct nlmsghdr *nlh;
3824 u32 preferred, valid;
3825
3826 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3827 if (nlh == NULL)
3828 return -EMSGSIZE;
3829
3830 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3831 ifa->idev->dev->ifindex);
3832
3833 if (!(ifa->flags&IFA_F_PERMANENT)) {
3834 preferred = ifa->prefered_lft;
3835 valid = ifa->valid_lft;
3836 if (preferred != INFINITY_LIFE_TIME) {
3837 long tval = (jiffies - ifa->tstamp)/HZ;
3838 if (preferred > tval)
3839 preferred -= tval;
3840 else
3841 preferred = 0;
3842 if (valid != INFINITY_LIFE_TIME) {
3843 if (valid > tval)
3844 valid -= tval;
3845 else
3846 valid = 0;
3847 }
3848 }
3849 } else {
3850 preferred = INFINITY_LIFE_TIME;
3851 valid = INFINITY_LIFE_TIME;
3852 }
3853
3854 if (!ipv6_addr_any(&ifa->peer_addr)) {
3855 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3856 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3857 goto error;
3858 } else
3859 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3860 goto error;
3861
3862 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3863 goto error;
3864
3865 return nlmsg_end(skb, nlh);
3866
3867 error:
3868 nlmsg_cancel(skb, nlh);
3869 return -EMSGSIZE;
3870 }
3871
3872 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3873 u32 portid, u32 seq, int event, u16 flags)
3874 {
3875 struct nlmsghdr *nlh;
3876 u8 scope = RT_SCOPE_UNIVERSE;
3877 int ifindex = ifmca->idev->dev->ifindex;
3878
3879 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3880 scope = RT_SCOPE_SITE;
3881
3882 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3883 if (nlh == NULL)
3884 return -EMSGSIZE;
3885
3886 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3887 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3888 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3889 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3890 nlmsg_cancel(skb, nlh);
3891 return -EMSGSIZE;
3892 }
3893
3894 return nlmsg_end(skb, nlh);
3895 }
3896
3897 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3898 u32 portid, u32 seq, int event, unsigned int flags)
3899 {
3900 struct nlmsghdr *nlh;
3901 u8 scope = RT_SCOPE_UNIVERSE;
3902 int ifindex = ifaca->aca_idev->dev->ifindex;
3903
3904 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3905 scope = RT_SCOPE_SITE;
3906
3907 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3908 if (nlh == NULL)
3909 return -EMSGSIZE;
3910
3911 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3912 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3913 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3914 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3915 nlmsg_cancel(skb, nlh);
3916 return -EMSGSIZE;
3917 }
3918
3919 return nlmsg_end(skb, nlh);
3920 }
3921
3922 enum addr_type_t {
3923 UNICAST_ADDR,
3924 MULTICAST_ADDR,
3925 ANYCAST_ADDR,
3926 };
3927
3928 /* called with rcu_read_lock() */
3929 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3930 struct netlink_callback *cb, enum addr_type_t type,
3931 int s_ip_idx, int *p_ip_idx)
3932 {
3933 struct ifmcaddr6 *ifmca;
3934 struct ifacaddr6 *ifaca;
3935 int err = 1;
3936 int ip_idx = *p_ip_idx;
3937
3938 read_lock_bh(&idev->lock);
3939 switch (type) {
3940 case UNICAST_ADDR: {
3941 struct inet6_ifaddr *ifa;
3942
3943 /* unicast address incl. temp addr */
3944 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3945 if (++ip_idx < s_ip_idx)
3946 continue;
3947 err = inet6_fill_ifaddr(skb, ifa,
3948 NETLINK_CB(cb->skb).portid,
3949 cb->nlh->nlmsg_seq,
3950 RTM_NEWADDR,
3951 NLM_F_MULTI);
3952 if (err <= 0)
3953 break;
3954 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3955 }
3956 break;
3957 }
3958 case MULTICAST_ADDR:
3959 /* multicast address */
3960 for (ifmca = idev->mc_list; ifmca;
3961 ifmca = ifmca->next, ip_idx++) {
3962 if (ip_idx < s_ip_idx)
3963 continue;
3964 err = inet6_fill_ifmcaddr(skb, ifmca,
3965 NETLINK_CB(cb->skb).portid,
3966 cb->nlh->nlmsg_seq,
3967 RTM_GETMULTICAST,
3968 NLM_F_MULTI);
3969 if (err <= 0)
3970 break;
3971 }
3972 break;
3973 case ANYCAST_ADDR:
3974 /* anycast address */
3975 for (ifaca = idev->ac_list; ifaca;
3976 ifaca = ifaca->aca_next, ip_idx++) {
3977 if (ip_idx < s_ip_idx)
3978 continue;
3979 err = inet6_fill_ifacaddr(skb, ifaca,
3980 NETLINK_CB(cb->skb).portid,
3981 cb->nlh->nlmsg_seq,
3982 RTM_GETANYCAST,
3983 NLM_F_MULTI);
3984 if (err <= 0)
3985 break;
3986 }
3987 break;
3988 default:
3989 break;
3990 }
3991 read_unlock_bh(&idev->lock);
3992 *p_ip_idx = ip_idx;
3993 return err;
3994 }
3995
3996 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3997 enum addr_type_t type)
3998 {
3999 struct net *net = sock_net(skb->sk);
4000 int h, s_h;
4001 int idx, ip_idx;
4002 int s_idx, s_ip_idx;
4003 struct net_device *dev;
4004 struct inet6_dev *idev;
4005 struct hlist_head *head;
4006
4007 s_h = cb->args[0];
4008 s_idx = idx = cb->args[1];
4009 s_ip_idx = ip_idx = cb->args[2];
4010
4011 rcu_read_lock();
4012 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4013 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4014 idx = 0;
4015 head = &net->dev_index_head[h];
4016 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4017 if (idx < s_idx)
4018 goto cont;
4019 if (h > s_h || idx > s_idx)
4020 s_ip_idx = 0;
4021 ip_idx = 0;
4022 idev = __in6_dev_get(dev);
4023 if (!idev)
4024 goto cont;
4025
4026 if (in6_dump_addrs(idev, skb, cb, type,
4027 s_ip_idx, &ip_idx) <= 0)
4028 goto done;
4029 cont:
4030 idx++;
4031 }
4032 }
4033 done:
4034 rcu_read_unlock();
4035 cb->args[0] = h;
4036 cb->args[1] = idx;
4037 cb->args[2] = ip_idx;
4038
4039 return skb->len;
4040 }
4041
4042 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4043 {
4044 enum addr_type_t type = UNICAST_ADDR;
4045
4046 return inet6_dump_addr(skb, cb, type);
4047 }
4048
4049 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4050 {
4051 enum addr_type_t type = MULTICAST_ADDR;
4052
4053 return inet6_dump_addr(skb, cb, type);
4054 }
4055
4056
4057 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4058 {
4059 enum addr_type_t type = ANYCAST_ADDR;
4060
4061 return inet6_dump_addr(skb, cb, type);
4062 }
4063
4064 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4065 {
4066 struct net *net = sock_net(in_skb->sk);
4067 struct ifaddrmsg *ifm;
4068 struct nlattr *tb[IFA_MAX+1];
4069 struct in6_addr *addr = NULL, *peer;
4070 struct net_device *dev = NULL;
4071 struct inet6_ifaddr *ifa;
4072 struct sk_buff *skb;
4073 int err;
4074
4075 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4076 if (err < 0)
4077 goto errout;
4078
4079 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4080 if (addr == NULL) {
4081 err = -EINVAL;
4082 goto errout;
4083 }
4084
4085 ifm = nlmsg_data(nlh);
4086 if (ifm->ifa_index)
4087 dev = __dev_get_by_index(net, ifm->ifa_index);
4088
4089 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4090 if (!ifa) {
4091 err = -EADDRNOTAVAIL;
4092 goto errout;
4093 }
4094
4095 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4096 if (!skb) {
4097 err = -ENOBUFS;
4098 goto errout_ifa;
4099 }
4100
4101 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4102 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4103 if (err < 0) {
4104 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4105 WARN_ON(err == -EMSGSIZE);
4106 kfree_skb(skb);
4107 goto errout_ifa;
4108 }
4109 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4110 errout_ifa:
4111 in6_ifa_put(ifa);
4112 errout:
4113 return err;
4114 }
4115
4116 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4117 {
4118 struct sk_buff *skb;
4119 struct net *net = dev_net(ifa->idev->dev);
4120 int err = -ENOBUFS;
4121
4122 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4123 if (skb == NULL)
4124 goto errout;
4125
4126 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4127 if (err < 0) {
4128 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4129 WARN_ON(err == -EMSGSIZE);
4130 kfree_skb(skb);
4131 goto errout;
4132 }
4133 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4134 return;
4135 errout:
4136 if (err < 0)
4137 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4138 }
4139
4140 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4141 __s32 *array, int bytes)
4142 {
4143 BUG_ON(bytes < (DEVCONF_MAX * 4));
4144
4145 memset(array, 0, bytes);
4146 array[DEVCONF_FORWARDING] = cnf->forwarding;
4147 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4148 array[DEVCONF_MTU6] = cnf->mtu6;
4149 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4150 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4151 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4152 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4153 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4154 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4155 jiffies_to_msecs(cnf->rtr_solicit_interval);
4156 array[DEVCONF_RTR_SOLICIT_DELAY] =
4157 jiffies_to_msecs(cnf->rtr_solicit_delay);
4158 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4159 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4160 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4161 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4162 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4163 #ifdef CONFIG_IPV6_PRIVACY
4164 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4165 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4166 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4167 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4168 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4169 #endif
4170 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4171 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4172 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4173 #ifdef CONFIG_IPV6_ROUTER_PREF
4174 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4175 array[DEVCONF_RTR_PROBE_INTERVAL] =
4176 jiffies_to_msecs(cnf->rtr_probe_interval);
4177 #ifdef CONFIG_IPV6_ROUTE_INFO
4178 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4179 #endif
4180 #endif
4181 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4182 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4183 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4184 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4185 #endif
4186 #ifdef CONFIG_IPV6_MROUTE
4187 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4188 #endif
4189 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4190 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4191 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4192 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4193 }
4194
4195 static inline size_t inet6_ifla6_size(void)
4196 {
4197 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4198 + nla_total_size(sizeof(struct ifla_cacheinfo))
4199 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4200 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4201 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4202 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4203 }
4204
4205 static inline size_t inet6_if_nlmsg_size(void)
4206 {
4207 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4208 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4209 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4210 + nla_total_size(4) /* IFLA_MTU */
4211 + nla_total_size(4) /* IFLA_LINK */
4212 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4213 }
4214
4215 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4216 int items, int bytes)
4217 {
4218 int i;
4219 int pad = bytes - sizeof(u64) * items;
4220 BUG_ON(pad < 0);
4221
4222 /* Use put_unaligned() because stats may not be aligned for u64. */
4223 put_unaligned(items, &stats[0]);
4224 for (i = 1; i < items; i++)
4225 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4226
4227 memset(&stats[items], 0, pad);
4228 }
4229
4230 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4231 int items, int bytes, size_t syncpoff)
4232 {
4233 int i;
4234 int pad = bytes - sizeof(u64) * items;
4235 BUG_ON(pad < 0);
4236
4237 /* Use put_unaligned() because stats may not be aligned for u64. */
4238 put_unaligned(items, &stats[0]);
4239 for (i = 1; i < items; i++)
4240 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4241
4242 memset(&stats[items], 0, pad);
4243 }
4244
4245 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4246 int bytes)
4247 {
4248 switch (attrtype) {
4249 case IFLA_INET6_STATS:
4250 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4251 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4252 break;
4253 case IFLA_INET6_ICMP6STATS:
4254 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4255 break;
4256 }
4257 }
4258
4259 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4260 {
4261 struct nlattr *nla;
4262 struct ifla_cacheinfo ci;
4263
4264 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4265 goto nla_put_failure;
4266 ci.max_reasm_len = IPV6_MAXPLEN;
4267 ci.tstamp = cstamp_delta(idev->tstamp);
4268 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4269 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4270 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4271 goto nla_put_failure;
4272 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4273 if (nla == NULL)
4274 goto nla_put_failure;
4275 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4276
4277 /* XXX - MC not implemented */
4278
4279 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4280 if (nla == NULL)
4281 goto nla_put_failure;
4282 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4283
4284 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4285 if (nla == NULL)
4286 goto nla_put_failure;
4287 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4288
4289 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4290 if (nla == NULL)
4291 goto nla_put_failure;
4292 read_lock_bh(&idev->lock);
4293 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4294 read_unlock_bh(&idev->lock);
4295
4296 return 0;
4297
4298 nla_put_failure:
4299 return -EMSGSIZE;
4300 }
4301
4302 static size_t inet6_get_link_af_size(const struct net_device *dev)
4303 {
4304 if (!__in6_dev_get(dev))
4305 return 0;
4306
4307 return inet6_ifla6_size();
4308 }
4309
4310 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4311 {
4312 struct inet6_dev *idev = __in6_dev_get(dev);
4313
4314 if (!idev)
4315 return -ENODATA;
4316
4317 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4318 return -EMSGSIZE;
4319
4320 return 0;
4321 }
4322
4323 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4324 {
4325 struct inet6_ifaddr *ifp;
4326 struct net_device *dev = idev->dev;
4327 bool update_rs = false;
4328 struct in6_addr ll_addr;
4329
4330 if (token == NULL)
4331 return -EINVAL;
4332 if (ipv6_addr_any(token))
4333 return -EINVAL;
4334 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4335 return -EINVAL;
4336 if (!ipv6_accept_ra(idev))
4337 return -EINVAL;
4338 if (idev->cnf.rtr_solicits <= 0)
4339 return -EINVAL;
4340
4341 write_lock_bh(&idev->lock);
4342
4343 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4344 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4345
4346 write_unlock_bh(&idev->lock);
4347
4348 if (!idev->dead && (idev->if_flags & IF_READY) &&
4349 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4350 IFA_F_OPTIMISTIC)) {
4351
4352 /* If we're not ready, then normal ifup will take care
4353 * of this. Otherwise, we need to request our rs here.
4354 */
4355 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4356 update_rs = true;
4357 }
4358
4359 write_lock_bh(&idev->lock);
4360
4361 if (update_rs) {
4362 idev->if_flags |= IF_RS_SENT;
4363 idev->rs_probes = 1;
4364 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4365 }
4366
4367 /* Well, that's kinda nasty ... */
4368 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4369 spin_lock(&ifp->lock);
4370 if (ifp->tokenized) {
4371 ifp->valid_lft = 0;
4372 ifp->prefered_lft = 0;
4373 }
4374 spin_unlock(&ifp->lock);
4375 }
4376
4377 write_unlock_bh(&idev->lock);
4378 addrconf_verify(0);
4379 return 0;
4380 }
4381
4382 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4383 {
4384 int err = -EINVAL;
4385 struct inet6_dev *idev = __in6_dev_get(dev);
4386 struct nlattr *tb[IFLA_INET6_MAX + 1];
4387
4388 if (!idev)
4389 return -EAFNOSUPPORT;
4390
4391 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4392 BUG();
4393
4394 if (tb[IFLA_INET6_TOKEN])
4395 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4396
4397 return err;
4398 }
4399
4400 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4401 u32 portid, u32 seq, int event, unsigned int flags)
4402 {
4403 struct net_device *dev = idev->dev;
4404 struct ifinfomsg *hdr;
4405 struct nlmsghdr *nlh;
4406 void *protoinfo;
4407
4408 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4409 if (nlh == NULL)
4410 return -EMSGSIZE;
4411
4412 hdr = nlmsg_data(nlh);
4413 hdr->ifi_family = AF_INET6;
4414 hdr->__ifi_pad = 0;
4415 hdr->ifi_type = dev->type;
4416 hdr->ifi_index = dev->ifindex;
4417 hdr->ifi_flags = dev_get_flags(dev);
4418 hdr->ifi_change = 0;
4419
4420 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4421 (dev->addr_len &&
4422 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4423 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4424 (dev->ifindex != dev->iflink &&
4425 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4426 goto nla_put_failure;
4427 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4428 if (protoinfo == NULL)
4429 goto nla_put_failure;
4430
4431 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4432 goto nla_put_failure;
4433
4434 nla_nest_end(skb, protoinfo);
4435 return nlmsg_end(skb, nlh);
4436
4437 nla_put_failure:
4438 nlmsg_cancel(skb, nlh);
4439 return -EMSGSIZE;
4440 }
4441
4442 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4443 {
4444 struct net *net = sock_net(skb->sk);
4445 int h, s_h;
4446 int idx = 0, s_idx;
4447 struct net_device *dev;
4448 struct inet6_dev *idev;
4449 struct hlist_head *head;
4450
4451 s_h = cb->args[0];
4452 s_idx = cb->args[1];
4453
4454 rcu_read_lock();
4455 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4456 idx = 0;
4457 head = &net->dev_index_head[h];
4458 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4459 if (idx < s_idx)
4460 goto cont;
4461 idev = __in6_dev_get(dev);
4462 if (!idev)
4463 goto cont;
4464 if (inet6_fill_ifinfo(skb, idev,
4465 NETLINK_CB(cb->skb).portid,
4466 cb->nlh->nlmsg_seq,
4467 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4468 goto out;
4469 cont:
4470 idx++;
4471 }
4472 }
4473 out:
4474 rcu_read_unlock();
4475 cb->args[1] = idx;
4476 cb->args[0] = h;
4477
4478 return skb->len;
4479 }
4480
4481 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4482 {
4483 struct sk_buff *skb;
4484 struct net *net = dev_net(idev->dev);
4485 int err = -ENOBUFS;
4486
4487 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4488 if (skb == NULL)
4489 goto errout;
4490
4491 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4492 if (err < 0) {
4493 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4494 WARN_ON(err == -EMSGSIZE);
4495 kfree_skb(skb);
4496 goto errout;
4497 }
4498 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4499 return;
4500 errout:
4501 if (err < 0)
4502 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4503 }
4504
4505 static inline size_t inet6_prefix_nlmsg_size(void)
4506 {
4507 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4508 + nla_total_size(sizeof(struct in6_addr))
4509 + nla_total_size(sizeof(struct prefix_cacheinfo));
4510 }
4511
4512 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4513 struct prefix_info *pinfo, u32 portid, u32 seq,
4514 int event, unsigned int flags)
4515 {
4516 struct prefixmsg *pmsg;
4517 struct nlmsghdr *nlh;
4518 struct prefix_cacheinfo ci;
4519
4520 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4521 if (nlh == NULL)
4522 return -EMSGSIZE;
4523
4524 pmsg = nlmsg_data(nlh);
4525 pmsg->prefix_family = AF_INET6;
4526 pmsg->prefix_pad1 = 0;
4527 pmsg->prefix_pad2 = 0;
4528 pmsg->prefix_ifindex = idev->dev->ifindex;
4529 pmsg->prefix_len = pinfo->prefix_len;
4530 pmsg->prefix_type = pinfo->type;
4531 pmsg->prefix_pad3 = 0;
4532 pmsg->prefix_flags = 0;
4533 if (pinfo->onlink)
4534 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4535 if (pinfo->autoconf)
4536 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4537
4538 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4539 goto nla_put_failure;
4540 ci.preferred_time = ntohl(pinfo->prefered);
4541 ci.valid_time = ntohl(pinfo->valid);
4542 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4543 goto nla_put_failure;
4544 return nlmsg_end(skb, nlh);
4545
4546 nla_put_failure:
4547 nlmsg_cancel(skb, nlh);
4548 return -EMSGSIZE;
4549 }
4550
4551 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4552 struct prefix_info *pinfo)
4553 {
4554 struct sk_buff *skb;
4555 struct net *net = dev_net(idev->dev);
4556 int err = -ENOBUFS;
4557
4558 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4559 if (skb == NULL)
4560 goto errout;
4561
4562 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4563 if (err < 0) {
4564 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4565 WARN_ON(err == -EMSGSIZE);
4566 kfree_skb(skb);
4567 goto errout;
4568 }
4569 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4570 return;
4571 errout:
4572 if (err < 0)
4573 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4574 }
4575
4576 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4577 {
4578 write_lock_bh(&ifp->idev->lock);
4579 spin_lock(&ifp->lock);
4580 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4581 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4582 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4583 ifp->idev->valid_ll_addr_cnt += count;
4584 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4585 spin_unlock(&ifp->lock);
4586 write_unlock_bh(&ifp->idev->lock);
4587 }
4588
4589 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4590 {
4591 struct net *net = dev_net(ifp->idev->dev);
4592
4593 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4594
4595 switch (event) {
4596 case RTM_NEWADDR:
4597 update_valid_ll_addr_cnt(ifp, 1);
4598
4599 /*
4600 * If the address was optimistic
4601 * we inserted the route at the start of
4602 * our DAD process, so we don't need
4603 * to do it again
4604 */
4605 if (!(ifp->rt->rt6i_node))
4606 ip6_ins_rt(ifp->rt);
4607 if (ifp->idev->cnf.forwarding)
4608 addrconf_join_anycast(ifp);
4609 if (!ipv6_addr_any(&ifp->peer_addr))
4610 addrconf_prefix_route(&ifp->peer_addr, 128,
4611 ifp->idev->dev, 0, 0);
4612 break;
4613 case RTM_DELADDR:
4614 update_valid_ll_addr_cnt(ifp, -1);
4615
4616 if (ifp->idev->cnf.forwarding)
4617 addrconf_leave_anycast(ifp);
4618 addrconf_leave_solict(ifp->idev, &ifp->addr);
4619 if (!ipv6_addr_any(&ifp->peer_addr)) {
4620 struct rt6_info *rt;
4621 struct net_device *dev = ifp->idev->dev;
4622
4623 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4624 dev->ifindex, 1);
4625 if (rt) {
4626 dst_hold(&rt->dst);
4627 if (ip6_del_rt(rt))
4628 dst_free(&rt->dst);
4629 }
4630 }
4631 dst_hold(&ifp->rt->dst);
4632
4633 if (ip6_del_rt(ifp->rt))
4634 dst_free(&ifp->rt->dst);
4635 break;
4636 }
4637 atomic_inc(&net->ipv6.dev_addr_genid);
4638 rt_genid_bump_ipv6(net);
4639 }
4640
4641 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4642 {
4643 rcu_read_lock_bh();
4644 if (likely(ifp->idev->dead == 0))
4645 __ipv6_ifa_notify(event, ifp);
4646 rcu_read_unlock_bh();
4647 }
4648
4649 #ifdef CONFIG_SYSCTL
4650
4651 static
4652 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4653 void __user *buffer, size_t *lenp, loff_t *ppos)
4654 {
4655 int *valp = ctl->data;
4656 int val = *valp;
4657 loff_t pos = *ppos;
4658 struct ctl_table lctl;
4659 int ret;
4660
4661 /*
4662 * ctl->data points to idev->cnf.forwarding, we should
4663 * not modify it until we get the rtnl lock.
4664 */
4665 lctl = *ctl;
4666 lctl.data = &val;
4667
4668 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4669
4670 if (write)
4671 ret = addrconf_fixup_forwarding(ctl, valp, val);
4672 if (ret)
4673 *ppos = pos;
4674 return ret;
4675 }
4676
4677 static void dev_disable_change(struct inet6_dev *idev)
4678 {
4679 struct netdev_notifier_info info;
4680
4681 if (!idev || !idev->dev)
4682 return;
4683
4684 netdev_notifier_info_init(&info, idev->dev);
4685 if (idev->cnf.disable_ipv6)
4686 addrconf_notify(NULL, NETDEV_DOWN, &info);
4687 else
4688 addrconf_notify(NULL, NETDEV_UP, &info);
4689 }
4690
4691 static void addrconf_disable_change(struct net *net, __s32 newf)
4692 {
4693 struct net_device *dev;
4694 struct inet6_dev *idev;
4695
4696 rcu_read_lock();
4697 for_each_netdev_rcu(net, dev) {
4698 idev = __in6_dev_get(dev);
4699 if (idev) {
4700 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4701 idev->cnf.disable_ipv6 = newf;
4702 if (changed)
4703 dev_disable_change(idev);
4704 }
4705 }
4706 rcu_read_unlock();
4707 }
4708
4709 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4710 {
4711 struct net *net;
4712 int old;
4713
4714 if (!rtnl_trylock())
4715 return restart_syscall();
4716
4717 net = (struct net *)table->extra2;
4718 old = *p;
4719 *p = newf;
4720
4721 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4722 rtnl_unlock();
4723 return 0;
4724 }
4725
4726 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4727 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4728 addrconf_disable_change(net, newf);
4729 } else if ((!newf) ^ (!old))
4730 dev_disable_change((struct inet6_dev *)table->extra1);
4731
4732 rtnl_unlock();
4733 return 0;
4734 }
4735
4736 static
4737 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4738 void __user *buffer, size_t *lenp, loff_t *ppos)
4739 {
4740 int *valp = ctl->data;
4741 int val = *valp;
4742 loff_t pos = *ppos;
4743 struct ctl_table lctl;
4744 int ret;
4745
4746 /*
4747 * ctl->data points to idev->cnf.disable_ipv6, we should
4748 * not modify it until we get the rtnl lock.
4749 */
4750 lctl = *ctl;
4751 lctl.data = &val;
4752
4753 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4754
4755 if (write)
4756 ret = addrconf_disable_ipv6(ctl, valp, val);
4757 if (ret)
4758 *ppos = pos;
4759 return ret;
4760 }
4761
4762 static struct addrconf_sysctl_table
4763 {
4764 struct ctl_table_header *sysctl_header;
4765 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4766 } addrconf_sysctl __read_mostly = {
4767 .sysctl_header = NULL,
4768 .addrconf_vars = {
4769 {
4770 .procname = "forwarding",
4771 .data = &ipv6_devconf.forwarding,
4772 .maxlen = sizeof(int),
4773 .mode = 0644,
4774 .proc_handler = addrconf_sysctl_forward,
4775 },
4776 {
4777 .procname = "hop_limit",
4778 .data = &ipv6_devconf.hop_limit,
4779 .maxlen = sizeof(int),
4780 .mode = 0644,
4781 .proc_handler = proc_dointvec,
4782 },
4783 {
4784 .procname = "mtu",
4785 .data = &ipv6_devconf.mtu6,
4786 .maxlen = sizeof(int),
4787 .mode = 0644,
4788 .proc_handler = proc_dointvec,
4789 },
4790 {
4791 .procname = "accept_ra",
4792 .data = &ipv6_devconf.accept_ra,
4793 .maxlen = sizeof(int),
4794 .mode = 0644,
4795 .proc_handler = proc_dointvec,
4796 },
4797 {
4798 .procname = "accept_redirects",
4799 .data = &ipv6_devconf.accept_redirects,
4800 .maxlen = sizeof(int),
4801 .mode = 0644,
4802 .proc_handler = proc_dointvec,
4803 },
4804 {
4805 .procname = "autoconf",
4806 .data = &ipv6_devconf.autoconf,
4807 .maxlen = sizeof(int),
4808 .mode = 0644,
4809 .proc_handler = proc_dointvec,
4810 },
4811 {
4812 .procname = "dad_transmits",
4813 .data = &ipv6_devconf.dad_transmits,
4814 .maxlen = sizeof(int),
4815 .mode = 0644,
4816 .proc_handler = proc_dointvec,
4817 },
4818 {
4819 .procname = "router_solicitations",
4820 .data = &ipv6_devconf.rtr_solicits,
4821 .maxlen = sizeof(int),
4822 .mode = 0644,
4823 .proc_handler = proc_dointvec,
4824 },
4825 {
4826 .procname = "router_solicitation_interval",
4827 .data = &ipv6_devconf.rtr_solicit_interval,
4828 .maxlen = sizeof(int),
4829 .mode = 0644,
4830 .proc_handler = proc_dointvec_jiffies,
4831 },
4832 {
4833 .procname = "router_solicitation_delay",
4834 .data = &ipv6_devconf.rtr_solicit_delay,
4835 .maxlen = sizeof(int),
4836 .mode = 0644,
4837 .proc_handler = proc_dointvec_jiffies,
4838 },
4839 {
4840 .procname = "force_mld_version",
4841 .data = &ipv6_devconf.force_mld_version,
4842 .maxlen = sizeof(int),
4843 .mode = 0644,
4844 .proc_handler = proc_dointvec,
4845 },
4846 {
4847 .procname = "mldv1_unsolicited_report_interval",
4848 .data =
4849 &ipv6_devconf.mldv1_unsolicited_report_interval,
4850 .maxlen = sizeof(int),
4851 .mode = 0644,
4852 .proc_handler = proc_dointvec_ms_jiffies,
4853 },
4854 {
4855 .procname = "mldv2_unsolicited_report_interval",
4856 .data =
4857 &ipv6_devconf.mldv2_unsolicited_report_interval,
4858 .maxlen = sizeof(int),
4859 .mode = 0644,
4860 .proc_handler = proc_dointvec_ms_jiffies,
4861 },
4862 #ifdef CONFIG_IPV6_PRIVACY
4863 {
4864 .procname = "use_tempaddr",
4865 .data = &ipv6_devconf.use_tempaddr,
4866 .maxlen = sizeof(int),
4867 .mode = 0644,
4868 .proc_handler = proc_dointvec,
4869 },
4870 {
4871 .procname = "temp_valid_lft",
4872 .data = &ipv6_devconf.temp_valid_lft,
4873 .maxlen = sizeof(int),
4874 .mode = 0644,
4875 .proc_handler = proc_dointvec,
4876 },
4877 {
4878 .procname = "temp_prefered_lft",
4879 .data = &ipv6_devconf.temp_prefered_lft,
4880 .maxlen = sizeof(int),
4881 .mode = 0644,
4882 .proc_handler = proc_dointvec,
4883 },
4884 {
4885 .procname = "regen_max_retry",
4886 .data = &ipv6_devconf.regen_max_retry,
4887 .maxlen = sizeof(int),
4888 .mode = 0644,
4889 .proc_handler = proc_dointvec,
4890 },
4891 {
4892 .procname = "max_desync_factor",
4893 .data = &ipv6_devconf.max_desync_factor,
4894 .maxlen = sizeof(int),
4895 .mode = 0644,
4896 .proc_handler = proc_dointvec,
4897 },
4898 #endif
4899 {
4900 .procname = "max_addresses",
4901 .data = &ipv6_devconf.max_addresses,
4902 .maxlen = sizeof(int),
4903 .mode = 0644,
4904 .proc_handler = proc_dointvec,
4905 },
4906 {
4907 .procname = "accept_ra_defrtr",
4908 .data = &ipv6_devconf.accept_ra_defrtr,
4909 .maxlen = sizeof(int),
4910 .mode = 0644,
4911 .proc_handler = proc_dointvec,
4912 },
4913 {
4914 .procname = "accept_ra_pinfo",
4915 .data = &ipv6_devconf.accept_ra_pinfo,
4916 .maxlen = sizeof(int),
4917 .mode = 0644,
4918 .proc_handler = proc_dointvec,
4919 },
4920 #ifdef CONFIG_IPV6_ROUTER_PREF
4921 {
4922 .procname = "accept_ra_rtr_pref",
4923 .data = &ipv6_devconf.accept_ra_rtr_pref,
4924 .maxlen = sizeof(int),
4925 .mode = 0644,
4926 .proc_handler = proc_dointvec,
4927 },
4928 {
4929 .procname = "router_probe_interval",
4930 .data = &ipv6_devconf.rtr_probe_interval,
4931 .maxlen = sizeof(int),
4932 .mode = 0644,
4933 .proc_handler = proc_dointvec_jiffies,
4934 },
4935 #ifdef CONFIG_IPV6_ROUTE_INFO
4936 {
4937 .procname = "accept_ra_rt_info_max_plen",
4938 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4939 .maxlen = sizeof(int),
4940 .mode = 0644,
4941 .proc_handler = proc_dointvec,
4942 },
4943 #endif
4944 #endif
4945 {
4946 .procname = "proxy_ndp",
4947 .data = &ipv6_devconf.proxy_ndp,
4948 .maxlen = sizeof(int),
4949 .mode = 0644,
4950 .proc_handler = proc_dointvec,
4951 },
4952 {
4953 .procname = "accept_source_route",
4954 .data = &ipv6_devconf.accept_source_route,
4955 .maxlen = sizeof(int),
4956 .mode = 0644,
4957 .proc_handler = proc_dointvec,
4958 },
4959 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4960 {
4961 .procname = "optimistic_dad",
4962 .data = &ipv6_devconf.optimistic_dad,
4963 .maxlen = sizeof(int),
4964 .mode = 0644,
4965 .proc_handler = proc_dointvec,
4966
4967 },
4968 #endif
4969 #ifdef CONFIG_IPV6_MROUTE
4970 {
4971 .procname = "mc_forwarding",
4972 .data = &ipv6_devconf.mc_forwarding,
4973 .maxlen = sizeof(int),
4974 .mode = 0444,
4975 .proc_handler = proc_dointvec,
4976 },
4977 #endif
4978 {
4979 .procname = "disable_ipv6",
4980 .data = &ipv6_devconf.disable_ipv6,
4981 .maxlen = sizeof(int),
4982 .mode = 0644,
4983 .proc_handler = addrconf_sysctl_disable,
4984 },
4985 {
4986 .procname = "accept_dad",
4987 .data = &ipv6_devconf.accept_dad,
4988 .maxlen = sizeof(int),
4989 .mode = 0644,
4990 .proc_handler = proc_dointvec,
4991 },
4992 {
4993 .procname = "force_tllao",
4994 .data = &ipv6_devconf.force_tllao,
4995 .maxlen = sizeof(int),
4996 .mode = 0644,
4997 .proc_handler = proc_dointvec
4998 },
4999 {
5000 .procname = "ndisc_notify",
5001 .data = &ipv6_devconf.ndisc_notify,
5002 .maxlen = sizeof(int),
5003 .mode = 0644,
5004 .proc_handler = proc_dointvec
5005 },
5006 {
5007 /* sentinel */
5008 }
5009 },
5010 };
5011
5012 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5013 struct inet6_dev *idev, struct ipv6_devconf *p)
5014 {
5015 int i;
5016 struct addrconf_sysctl_table *t;
5017 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5018
5019 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5020 if (t == NULL)
5021 goto out;
5022
5023 for (i = 0; t->addrconf_vars[i].data; i++) {
5024 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5025 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5026 t->addrconf_vars[i].extra2 = net;
5027 }
5028
5029 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5030
5031 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5032 if (t->sysctl_header == NULL)
5033 goto free;
5034
5035 p->sysctl = t;
5036 return 0;
5037
5038 free:
5039 kfree(t);
5040 out:
5041 return -ENOBUFS;
5042 }
5043
5044 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5045 {
5046 struct addrconf_sysctl_table *t;
5047
5048 if (p->sysctl == NULL)
5049 return;
5050
5051 t = p->sysctl;
5052 p->sysctl = NULL;
5053 unregister_net_sysctl_table(t->sysctl_header);
5054 kfree(t);
5055 }
5056
5057 static void addrconf_sysctl_register(struct inet6_dev *idev)
5058 {
5059 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
5060 &ndisc_ifinfo_sysctl_change);
5061 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5062 idev, &idev->cnf);
5063 }
5064
5065 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5066 {
5067 __addrconf_sysctl_unregister(&idev->cnf);
5068 neigh_sysctl_unregister(idev->nd_parms);
5069 }
5070
5071
5072 #endif
5073
5074 static int __net_init addrconf_init_net(struct net *net)
5075 {
5076 int err = -ENOMEM;
5077 struct ipv6_devconf *all, *dflt;
5078
5079 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5080 if (all == NULL)
5081 goto err_alloc_all;
5082
5083 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5084 if (dflt == NULL)
5085 goto err_alloc_dflt;
5086
5087 /* these will be inherited by all namespaces */
5088 dflt->autoconf = ipv6_defaults.autoconf;
5089 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5090
5091 net->ipv6.devconf_all = all;
5092 net->ipv6.devconf_dflt = dflt;
5093
5094 #ifdef CONFIG_SYSCTL
5095 err = __addrconf_sysctl_register(net, "all", NULL, all);
5096 if (err < 0)
5097 goto err_reg_all;
5098
5099 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5100 if (err < 0)
5101 goto err_reg_dflt;
5102 #endif
5103 return 0;
5104
5105 #ifdef CONFIG_SYSCTL
5106 err_reg_dflt:
5107 __addrconf_sysctl_unregister(all);
5108 err_reg_all:
5109 kfree(dflt);
5110 #endif
5111 err_alloc_dflt:
5112 kfree(all);
5113 err_alloc_all:
5114 return err;
5115 }
5116
5117 static void __net_exit addrconf_exit_net(struct net *net)
5118 {
5119 #ifdef CONFIG_SYSCTL
5120 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5121 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5122 #endif
5123 if (!net_eq(net, &init_net)) {
5124 kfree(net->ipv6.devconf_dflt);
5125 kfree(net->ipv6.devconf_all);
5126 }
5127 }
5128
5129 static struct pernet_operations addrconf_ops = {
5130 .init = addrconf_init_net,
5131 .exit = addrconf_exit_net,
5132 };
5133
5134 static struct rtnl_af_ops inet6_ops = {
5135 .family = AF_INET6,
5136 .fill_link_af = inet6_fill_link_af,
5137 .get_link_af_size = inet6_get_link_af_size,
5138 .set_link_af = inet6_set_link_af,
5139 };
5140
5141 /*
5142 * Init / cleanup code
5143 */
5144
5145 int __init addrconf_init(void)
5146 {
5147 int i, err;
5148
5149 err = ipv6_addr_label_init();
5150 if (err < 0) {
5151 pr_crit("%s: cannot initialize default policy table: %d\n",
5152 __func__, err);
5153 goto out;
5154 }
5155
5156 err = register_pernet_subsys(&addrconf_ops);
5157 if (err < 0)
5158 goto out_addrlabel;
5159
5160 /* The addrconf netdev notifier requires that loopback_dev
5161 * has it's ipv6 private information allocated and setup
5162 * before it can bring up and give link-local addresses
5163 * to other devices which are up.
5164 *
5165 * Unfortunately, loopback_dev is not necessarily the first
5166 * entry in the global dev_base list of net devices. In fact,
5167 * it is likely to be the very last entry on that list.
5168 * So this causes the notifier registry below to try and
5169 * give link-local addresses to all devices besides loopback_dev
5170 * first, then loopback_dev, which cases all the non-loopback_dev
5171 * devices to fail to get a link-local address.
5172 *
5173 * So, as a temporary fix, allocate the ipv6 structure for
5174 * loopback_dev first by hand.
5175 * Longer term, all of the dependencies ipv6 has upon the loopback
5176 * device and it being up should be removed.
5177 */
5178 rtnl_lock();
5179 if (!ipv6_add_dev(init_net.loopback_dev))
5180 err = -ENOMEM;
5181 rtnl_unlock();
5182 if (err)
5183 goto errlo;
5184
5185 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5186 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5187
5188 register_netdevice_notifier(&ipv6_dev_notf);
5189
5190 addrconf_verify(0);
5191
5192 err = rtnl_af_register(&inet6_ops);
5193 if (err < 0)
5194 goto errout_af;
5195
5196 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5197 NULL);
5198 if (err < 0)
5199 goto errout;
5200
5201 /* Only the first call to __rtnl_register can fail */
5202 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5203 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5204 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5205 inet6_dump_ifaddr, NULL);
5206 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5207 inet6_dump_ifmcaddr, NULL);
5208 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5209 inet6_dump_ifacaddr, NULL);
5210 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5211 inet6_netconf_dump_devconf, NULL);
5212
5213 ipv6_addr_label_rtnl_register();
5214
5215 return 0;
5216 errout:
5217 rtnl_af_unregister(&inet6_ops);
5218 errout_af:
5219 unregister_netdevice_notifier(&ipv6_dev_notf);
5220 errlo:
5221 unregister_pernet_subsys(&addrconf_ops);
5222 out_addrlabel:
5223 ipv6_addr_label_cleanup();
5224 out:
5225 return err;
5226 }
5227
5228 void addrconf_cleanup(void)
5229 {
5230 struct net_device *dev;
5231 int i;
5232
5233 unregister_netdevice_notifier(&ipv6_dev_notf);
5234 unregister_pernet_subsys(&addrconf_ops);
5235 ipv6_addr_label_cleanup();
5236
5237 rtnl_lock();
5238
5239 __rtnl_af_unregister(&inet6_ops);
5240
5241 /* clean dev list */
5242 for_each_netdev(&init_net, dev) {
5243 if (__in6_dev_get(dev) == NULL)
5244 continue;
5245 addrconf_ifdown(dev, 1);
5246 }
5247 addrconf_ifdown(init_net.loopback_dev, 2);
5248
5249 /*
5250 * Check hash table.
5251 */
5252 spin_lock_bh(&addrconf_hash_lock);
5253 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5254 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5255 spin_unlock_bh(&addrconf_hash_lock);
5256
5257 del_timer(&addr_chk_timer);
5258 rtnl_unlock();
5259 }
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