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[mirror_ubuntu-zesty-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(x) printk x
103 #else
104 #define ADBG(x)
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 .dad_transmits = 1,
181 .rtr_solicits = MAX_RTR_SOLICITATIONS,
182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
184 #ifdef CONFIG_IPV6_PRIVACY
185 .use_tempaddr = 0,
186 .temp_valid_lft = TEMP_VALID_LIFETIME,
187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
188 .regen_max_retry = REGEN_MAX_RETRY,
189 .max_desync_factor = MAX_DESYNC_FACTOR,
190 #endif
191 .max_addresses = IPV6_MAX_ADDRESSES,
192 .accept_ra_defrtr = 1,
193 .accept_ra_pinfo = 1,
194 #ifdef CONFIG_IPV6_ROUTER_PREF
195 .accept_ra_rtr_pref = 1,
196 .rtr_probe_interval = 60 * HZ,
197 #ifdef CONFIG_IPV6_ROUTE_INFO
198 .accept_ra_rt_info_max_plen = 0,
199 #endif
200 #endif
201 .proxy_ndp = 0,
202 .accept_source_route = 0, /* we do not accept RH0 by default. */
203 .disable_ipv6 = 0,
204 .accept_dad = 1,
205 };
206
207 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
208 .forwarding = 0,
209 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
210 .mtu6 = IPV6_MIN_MTU,
211 .accept_ra = 1,
212 .accept_redirects = 1,
213 .autoconf = 1,
214 .dad_transmits = 1,
215 .rtr_solicits = MAX_RTR_SOLICITATIONS,
216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
218 #ifdef CONFIG_IPV6_PRIVACY
219 .use_tempaddr = 0,
220 .temp_valid_lft = TEMP_VALID_LIFETIME,
221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
222 .regen_max_retry = REGEN_MAX_RETRY,
223 .max_desync_factor = MAX_DESYNC_FACTOR,
224 #endif
225 .max_addresses = IPV6_MAX_ADDRESSES,
226 .accept_ra_defrtr = 1,
227 .accept_ra_pinfo = 1,
228 #ifdef CONFIG_IPV6_ROUTER_PREF
229 .accept_ra_rtr_pref = 1,
230 .rtr_probe_interval = 60 * HZ,
231 #ifdef CONFIG_IPV6_ROUTE_INFO
232 .accept_ra_rt_info_max_plen = 0,
233 #endif
234 #endif
235 .proxy_ndp = 0,
236 .accept_source_route = 0, /* we do not accept RH0 by default. */
237 .disable_ipv6 = 0,
238 .accept_dad = 1,
239 };
240
241 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
242 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
243 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
244 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
245 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
246 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
247 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
248 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
249
250 /* Check if a valid qdisc is available */
251 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
252 {
253 return !qdisc_tx_is_noop(dev);
254 }
255
256 static void addrconf_del_rs_timer(struct inet6_dev *idev)
257 {
258 if (del_timer(&idev->rs_timer))
259 __in6_dev_put(idev);
260 }
261
262 static void addrconf_del_dad_timer(struct inet6_ifaddr *ifp)
263 {
264 if (del_timer(&ifp->dad_timer))
265 __in6_ifa_put(ifp);
266 }
267
268 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
269 unsigned long when)
270 {
271 if (!timer_pending(&idev->rs_timer))
272 in6_dev_hold(idev);
273 mod_timer(&idev->rs_timer, jiffies + when);
274 }
275
276 static void addrconf_mod_dad_timer(struct inet6_ifaddr *ifp,
277 unsigned long when)
278 {
279 if (!timer_pending(&ifp->dad_timer))
280 in6_ifa_hold(ifp);
281 mod_timer(&ifp->dad_timer, jiffies + when);
282 }
283
284 static int snmp6_alloc_dev(struct inet6_dev *idev)
285 {
286 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
287 sizeof(struct ipstats_mib),
288 __alignof__(struct ipstats_mib)) < 0)
289 goto err_ip;
290 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
291 GFP_KERNEL);
292 if (!idev->stats.icmpv6dev)
293 goto err_icmp;
294 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
295 GFP_KERNEL);
296 if (!idev->stats.icmpv6msgdev)
297 goto err_icmpmsg;
298
299 return 0;
300
301 err_icmpmsg:
302 kfree(idev->stats.icmpv6dev);
303 err_icmp:
304 snmp_mib_free((void __percpu **)idev->stats.ipv6);
305 err_ip:
306 return -ENOMEM;
307 }
308
309 static void snmp6_free_dev(struct inet6_dev *idev)
310 {
311 kfree(idev->stats.icmpv6msgdev);
312 kfree(idev->stats.icmpv6dev);
313 snmp_mib_free((void __percpu **)idev->stats.ipv6);
314 }
315
316 /* Nobody refers to this device, we may destroy it. */
317
318 void in6_dev_finish_destroy(struct inet6_dev *idev)
319 {
320 struct net_device *dev = idev->dev;
321
322 WARN_ON(!list_empty(&idev->addr_list));
323 WARN_ON(idev->mc_list != NULL);
324 WARN_ON(timer_pending(&idev->rs_timer));
325
326 #ifdef NET_REFCNT_DEBUG
327 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
328 #endif
329 dev_put(dev);
330 if (!idev->dead) {
331 pr_warn("Freeing alive inet6 device %p\n", idev);
332 return;
333 }
334 snmp6_free_dev(idev);
335 kfree_rcu(idev, rcu);
336 }
337 EXPORT_SYMBOL(in6_dev_finish_destroy);
338
339 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
340 {
341 struct inet6_dev *ndev;
342
343 ASSERT_RTNL();
344
345 if (dev->mtu < IPV6_MIN_MTU)
346 return NULL;
347
348 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
349
350 if (ndev == NULL)
351 return NULL;
352
353 rwlock_init(&ndev->lock);
354 ndev->dev = dev;
355 INIT_LIST_HEAD(&ndev->addr_list);
356 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
357 (unsigned long)ndev);
358 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
359 ndev->cnf.mtu6 = dev->mtu;
360 ndev->cnf.sysctl = NULL;
361 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
362 if (ndev->nd_parms == NULL) {
363 kfree(ndev);
364 return NULL;
365 }
366 if (ndev->cnf.forwarding)
367 dev_disable_lro(dev);
368 /* We refer to the device */
369 dev_hold(dev);
370
371 if (snmp6_alloc_dev(ndev) < 0) {
372 ADBG((KERN_WARNING
373 "%s: cannot allocate memory for statistics; dev=%s.\n",
374 __func__, dev->name));
375 neigh_parms_release(&nd_tbl, ndev->nd_parms);
376 dev_put(dev);
377 kfree(ndev);
378 return NULL;
379 }
380
381 if (snmp6_register_dev(ndev) < 0) {
382 ADBG((KERN_WARNING
383 "%s: cannot create /proc/net/dev_snmp6/%s\n",
384 __func__, dev->name));
385 neigh_parms_release(&nd_tbl, ndev->nd_parms);
386 ndev->dead = 1;
387 in6_dev_finish_destroy(ndev);
388 return NULL;
389 }
390
391 /* One reference from device. We must do this before
392 * we invoke __ipv6_regen_rndid().
393 */
394 in6_dev_hold(ndev);
395
396 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
397 ndev->cnf.accept_dad = -1;
398
399 #if IS_ENABLED(CONFIG_IPV6_SIT)
400 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
401 pr_info("%s: Disabled Multicast RS\n", dev->name);
402 ndev->cnf.rtr_solicits = 0;
403 }
404 #endif
405
406 #ifdef CONFIG_IPV6_PRIVACY
407 INIT_LIST_HEAD(&ndev->tempaddr_list);
408 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
409 if ((dev->flags&IFF_LOOPBACK) ||
410 dev->type == ARPHRD_TUNNEL ||
411 dev->type == ARPHRD_TUNNEL6 ||
412 dev->type == ARPHRD_SIT ||
413 dev->type == ARPHRD_NONE) {
414 ndev->cnf.use_tempaddr = -1;
415 } else {
416 in6_dev_hold(ndev);
417 ipv6_regen_rndid((unsigned long) ndev);
418 }
419 #endif
420 ndev->token = in6addr_any;
421
422 if (netif_running(dev) && addrconf_qdisc_ok(dev))
423 ndev->if_flags |= IF_READY;
424
425 ipv6_mc_init_dev(ndev);
426 ndev->tstamp = jiffies;
427 addrconf_sysctl_register(ndev);
428 /* protected by rtnl_lock */
429 rcu_assign_pointer(dev->ip6_ptr, ndev);
430
431 /* Join interface-local all-node multicast group */
432 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
433
434 /* Join all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
436
437 /* Join all-router multicast group if forwarding is set */
438 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
439 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
440
441 return ndev;
442 }
443
444 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
445 {
446 struct inet6_dev *idev;
447
448 ASSERT_RTNL();
449
450 idev = __in6_dev_get(dev);
451 if (!idev) {
452 idev = ipv6_add_dev(dev);
453 if (!idev)
454 return NULL;
455 }
456
457 if (dev->flags&IFF_UP)
458 ipv6_mc_up(idev);
459 return idev;
460 }
461
462 static int inet6_netconf_msgsize_devconf(int type)
463 {
464 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
465 + nla_total_size(4); /* NETCONFA_IFINDEX */
466
467 /* type -1 is used for ALL */
468 if (type == -1 || type == NETCONFA_FORWARDING)
469 size += nla_total_size(4);
470 #ifdef CONFIG_IPV6_MROUTE
471 if (type == -1 || type == NETCONFA_MC_FORWARDING)
472 size += nla_total_size(4);
473 #endif
474
475 return size;
476 }
477
478 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
479 struct ipv6_devconf *devconf, u32 portid,
480 u32 seq, int event, unsigned int flags,
481 int type)
482 {
483 struct nlmsghdr *nlh;
484 struct netconfmsg *ncm;
485
486 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
487 flags);
488 if (nlh == NULL)
489 return -EMSGSIZE;
490
491 ncm = nlmsg_data(nlh);
492 ncm->ncm_family = AF_INET6;
493
494 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
495 goto nla_put_failure;
496
497 /* type -1 is used for ALL */
498 if ((type == -1 || type == NETCONFA_FORWARDING) &&
499 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
500 goto nla_put_failure;
501 #ifdef CONFIG_IPV6_MROUTE
502 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
503 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
504 devconf->mc_forwarding) < 0)
505 goto nla_put_failure;
506 #endif
507 return nlmsg_end(skb, nlh);
508
509 nla_put_failure:
510 nlmsg_cancel(skb, nlh);
511 return -EMSGSIZE;
512 }
513
514 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
515 struct ipv6_devconf *devconf)
516 {
517 struct sk_buff *skb;
518 int err = -ENOBUFS;
519
520 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
521 if (skb == NULL)
522 goto errout;
523
524 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
525 RTM_NEWNETCONF, 0, type);
526 if (err < 0) {
527 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
528 WARN_ON(err == -EMSGSIZE);
529 kfree_skb(skb);
530 goto errout;
531 }
532 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
533 return;
534 errout:
535 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
536 }
537
538 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
539 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
540 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
541 };
542
543 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
544 struct nlmsghdr *nlh)
545 {
546 struct net *net = sock_net(in_skb->sk);
547 struct nlattr *tb[NETCONFA_MAX+1];
548 struct netconfmsg *ncm;
549 struct sk_buff *skb;
550 struct ipv6_devconf *devconf;
551 struct inet6_dev *in6_dev;
552 struct net_device *dev;
553 int ifindex;
554 int err;
555
556 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
557 devconf_ipv6_policy);
558 if (err < 0)
559 goto errout;
560
561 err = EINVAL;
562 if (!tb[NETCONFA_IFINDEX])
563 goto errout;
564
565 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
566 switch (ifindex) {
567 case NETCONFA_IFINDEX_ALL:
568 devconf = net->ipv6.devconf_all;
569 break;
570 case NETCONFA_IFINDEX_DEFAULT:
571 devconf = net->ipv6.devconf_dflt;
572 break;
573 default:
574 dev = __dev_get_by_index(net, ifindex);
575 if (dev == NULL)
576 goto errout;
577 in6_dev = __in6_dev_get(dev);
578 if (in6_dev == NULL)
579 goto errout;
580 devconf = &in6_dev->cnf;
581 break;
582 }
583
584 err = -ENOBUFS;
585 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
586 if (skb == NULL)
587 goto errout;
588
589 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
590 NETLINK_CB(in_skb).portid,
591 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
592 -1);
593 if (err < 0) {
594 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
595 WARN_ON(err == -EMSGSIZE);
596 kfree_skb(skb);
597 goto errout;
598 }
599 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
600 errout:
601 return err;
602 }
603
604 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
605 struct netlink_callback *cb)
606 {
607 struct net *net = sock_net(skb->sk);
608 int h, s_h;
609 int idx, s_idx;
610 struct net_device *dev;
611 struct inet6_dev *idev;
612 struct hlist_head *head;
613
614 s_h = cb->args[0];
615 s_idx = idx = cb->args[1];
616
617 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
618 idx = 0;
619 head = &net->dev_index_head[h];
620 rcu_read_lock();
621 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
622 net->dev_base_seq;
623 hlist_for_each_entry_rcu(dev, head, index_hlist) {
624 if (idx < s_idx)
625 goto cont;
626 idev = __in6_dev_get(dev);
627 if (!idev)
628 goto cont;
629
630 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
631 &idev->cnf,
632 NETLINK_CB(cb->skb).portid,
633 cb->nlh->nlmsg_seq,
634 RTM_NEWNETCONF,
635 NLM_F_MULTI,
636 -1) <= 0) {
637 rcu_read_unlock();
638 goto done;
639 }
640 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
641 cont:
642 idx++;
643 }
644 rcu_read_unlock();
645 }
646 if (h == NETDEV_HASHENTRIES) {
647 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
648 net->ipv6.devconf_all,
649 NETLINK_CB(cb->skb).portid,
650 cb->nlh->nlmsg_seq,
651 RTM_NEWNETCONF, NLM_F_MULTI,
652 -1) <= 0)
653 goto done;
654 else
655 h++;
656 }
657 if (h == NETDEV_HASHENTRIES + 1) {
658 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
659 net->ipv6.devconf_dflt,
660 NETLINK_CB(cb->skb).portid,
661 cb->nlh->nlmsg_seq,
662 RTM_NEWNETCONF, NLM_F_MULTI,
663 -1) <= 0)
664 goto done;
665 else
666 h++;
667 }
668 done:
669 cb->args[0] = h;
670 cb->args[1] = idx;
671
672 return skb->len;
673 }
674
675 #ifdef CONFIG_SYSCTL
676 static void dev_forward_change(struct inet6_dev *idev)
677 {
678 struct net_device *dev;
679 struct inet6_ifaddr *ifa;
680
681 if (!idev)
682 return;
683 dev = idev->dev;
684 if (idev->cnf.forwarding)
685 dev_disable_lro(dev);
686 if (dev->flags & IFF_MULTICAST) {
687 if (idev->cnf.forwarding) {
688 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
689 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
690 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
691 } else {
692 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
693 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
694 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
695 }
696 }
697
698 list_for_each_entry(ifa, &idev->addr_list, if_list) {
699 if (ifa->flags&IFA_F_TENTATIVE)
700 continue;
701 if (idev->cnf.forwarding)
702 addrconf_join_anycast(ifa);
703 else
704 addrconf_leave_anycast(ifa);
705 }
706 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
707 dev->ifindex, &idev->cnf);
708 }
709
710
711 static void addrconf_forward_change(struct net *net, __s32 newf)
712 {
713 struct net_device *dev;
714 struct inet6_dev *idev;
715
716 for_each_netdev(net, dev) {
717 idev = __in6_dev_get(dev);
718 if (idev) {
719 int changed = (!idev->cnf.forwarding) ^ (!newf);
720 idev->cnf.forwarding = newf;
721 if (changed)
722 dev_forward_change(idev);
723 }
724 }
725 }
726
727 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
728 {
729 struct net *net;
730 int old;
731
732 if (!rtnl_trylock())
733 return restart_syscall();
734
735 net = (struct net *)table->extra2;
736 old = *p;
737 *p = newf;
738
739 if (p == &net->ipv6.devconf_dflt->forwarding) {
740 if ((!newf) ^ (!old))
741 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
742 NETCONFA_IFINDEX_DEFAULT,
743 net->ipv6.devconf_dflt);
744 rtnl_unlock();
745 return 0;
746 }
747
748 if (p == &net->ipv6.devconf_all->forwarding) {
749 net->ipv6.devconf_dflt->forwarding = newf;
750 addrconf_forward_change(net, newf);
751 if ((!newf) ^ (!old))
752 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
753 NETCONFA_IFINDEX_ALL,
754 net->ipv6.devconf_all);
755 } else if ((!newf) ^ (!old))
756 dev_forward_change((struct inet6_dev *)table->extra1);
757 rtnl_unlock();
758
759 if (newf)
760 rt6_purge_dflt_routers(net);
761 return 1;
762 }
763 #endif
764
765 /* Nobody refers to this ifaddr, destroy it */
766 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
767 {
768 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
769
770 #ifdef NET_REFCNT_DEBUG
771 pr_debug("%s\n", __func__);
772 #endif
773
774 in6_dev_put(ifp->idev);
775
776 if (del_timer(&ifp->dad_timer))
777 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
778
779 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
780 pr_warn("Freeing alive inet6 address %p\n", ifp);
781 return;
782 }
783 ip6_rt_put(ifp->rt);
784
785 kfree_rcu(ifp, rcu);
786 }
787
788 static void
789 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
790 {
791 struct list_head *p;
792 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
793
794 /*
795 * Each device address list is sorted in order of scope -
796 * global before linklocal.
797 */
798 list_for_each(p, &idev->addr_list) {
799 struct inet6_ifaddr *ifa
800 = list_entry(p, struct inet6_ifaddr, if_list);
801 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
802 break;
803 }
804
805 list_add_tail(&ifp->if_list, p);
806 }
807
808 static u32 inet6_addr_hash(const struct in6_addr *addr)
809 {
810 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
811 }
812
813 /* On success it returns ifp with increased reference count */
814
815 static struct inet6_ifaddr *
816 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
817 const struct in6_addr *peer_addr, int pfxlen,
818 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
819 {
820 struct inet6_ifaddr *ifa = NULL;
821 struct rt6_info *rt;
822 unsigned int hash;
823 int err = 0;
824 int addr_type = ipv6_addr_type(addr);
825
826 if (addr_type == IPV6_ADDR_ANY ||
827 addr_type & IPV6_ADDR_MULTICAST ||
828 (!(idev->dev->flags & IFF_LOOPBACK) &&
829 addr_type & IPV6_ADDR_LOOPBACK))
830 return ERR_PTR(-EADDRNOTAVAIL);
831
832 rcu_read_lock_bh();
833 if (idev->dead) {
834 err = -ENODEV; /*XXX*/
835 goto out2;
836 }
837
838 if (idev->cnf.disable_ipv6) {
839 err = -EACCES;
840 goto out2;
841 }
842
843 spin_lock(&addrconf_hash_lock);
844
845 /* Ignore adding duplicate addresses on an interface */
846 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
847 ADBG(("ipv6_add_addr: already assigned\n"));
848 err = -EEXIST;
849 goto out;
850 }
851
852 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
853
854 if (ifa == NULL) {
855 ADBG(("ipv6_add_addr: malloc failed\n"));
856 err = -ENOBUFS;
857 goto out;
858 }
859
860 rt = addrconf_dst_alloc(idev, addr, false);
861 if (IS_ERR(rt)) {
862 err = PTR_ERR(rt);
863 goto out;
864 }
865
866 ifa->addr = *addr;
867 if (peer_addr)
868 ifa->peer_addr = *peer_addr;
869
870 spin_lock_init(&ifa->lock);
871 spin_lock_init(&ifa->state_lock);
872 setup_timer(&ifa->dad_timer, addrconf_dad_timer,
873 (unsigned long)ifa);
874 INIT_HLIST_NODE(&ifa->addr_lst);
875 ifa->scope = scope;
876 ifa->prefix_len = pfxlen;
877 ifa->flags = flags | IFA_F_TENTATIVE;
878 ifa->valid_lft = valid_lft;
879 ifa->prefered_lft = prefered_lft;
880 ifa->cstamp = ifa->tstamp = jiffies;
881 ifa->tokenized = false;
882
883 ifa->rt = rt;
884
885 ifa->idev = idev;
886 in6_dev_hold(idev);
887 /* For caller */
888 in6_ifa_hold(ifa);
889
890 /* Add to big hash table */
891 hash = inet6_addr_hash(addr);
892
893 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
894 spin_unlock(&addrconf_hash_lock);
895
896 write_lock(&idev->lock);
897 /* Add to inet6_dev unicast addr list. */
898 ipv6_link_dev_addr(idev, ifa);
899
900 #ifdef CONFIG_IPV6_PRIVACY
901 if (ifa->flags&IFA_F_TEMPORARY) {
902 list_add(&ifa->tmp_list, &idev->tempaddr_list);
903 in6_ifa_hold(ifa);
904 }
905 #endif
906
907 in6_ifa_hold(ifa);
908 write_unlock(&idev->lock);
909 out2:
910 rcu_read_unlock_bh();
911
912 if (likely(err == 0))
913 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
914 else {
915 kfree(ifa);
916 ifa = ERR_PTR(err);
917 }
918
919 return ifa;
920 out:
921 spin_unlock(&addrconf_hash_lock);
922 goto out2;
923 }
924
925 /* This function wants to get referenced ifp and releases it before return */
926
927 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
928 {
929 struct inet6_ifaddr *ifa, *ifn;
930 struct inet6_dev *idev = ifp->idev;
931 int state;
932 int deleted = 0, onlink = 0;
933 unsigned long expires = jiffies;
934
935 spin_lock_bh(&ifp->state_lock);
936 state = ifp->state;
937 ifp->state = INET6_IFADDR_STATE_DEAD;
938 spin_unlock_bh(&ifp->state_lock);
939
940 if (state == INET6_IFADDR_STATE_DEAD)
941 goto out;
942
943 spin_lock_bh(&addrconf_hash_lock);
944 hlist_del_init_rcu(&ifp->addr_lst);
945 spin_unlock_bh(&addrconf_hash_lock);
946
947 write_lock_bh(&idev->lock);
948 #ifdef CONFIG_IPV6_PRIVACY
949 if (ifp->flags&IFA_F_TEMPORARY) {
950 list_del(&ifp->tmp_list);
951 if (ifp->ifpub) {
952 in6_ifa_put(ifp->ifpub);
953 ifp->ifpub = NULL;
954 }
955 __in6_ifa_put(ifp);
956 }
957 #endif
958
959 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
960 if (ifa == ifp) {
961 list_del_init(&ifp->if_list);
962 __in6_ifa_put(ifp);
963
964 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
965 break;
966 deleted = 1;
967 continue;
968 } else if (ifp->flags & IFA_F_PERMANENT) {
969 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
970 ifp->prefix_len)) {
971 if (ifa->flags & IFA_F_PERMANENT) {
972 onlink = 1;
973 if (deleted)
974 break;
975 } else {
976 unsigned long lifetime;
977
978 if (!onlink)
979 onlink = -1;
980
981 spin_lock(&ifa->lock);
982
983 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
984 /*
985 * Note: Because this address is
986 * not permanent, lifetime <
987 * LONG_MAX / HZ here.
988 */
989 if (time_before(expires,
990 ifa->tstamp + lifetime * HZ))
991 expires = ifa->tstamp + lifetime * HZ;
992 spin_unlock(&ifa->lock);
993 }
994 }
995 }
996 }
997 write_unlock_bh(&idev->lock);
998
999 addrconf_del_dad_timer(ifp);
1000
1001 ipv6_ifa_notify(RTM_DELADDR, ifp);
1002
1003 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1004
1005 /*
1006 * Purge or update corresponding prefix
1007 *
1008 * 1) we don't purge prefix here if address was not permanent.
1009 * prefix is managed by its own lifetime.
1010 * 2) if there're no addresses, delete prefix.
1011 * 3) if there're still other permanent address(es),
1012 * corresponding prefix is still permanent.
1013 * 4) otherwise, update prefix lifetime to the
1014 * longest valid lifetime among the corresponding
1015 * addresses on the device.
1016 * Note: subsequent RA will update lifetime.
1017 *
1018 * --yoshfuji
1019 */
1020 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1021 struct in6_addr prefix;
1022 struct rt6_info *rt;
1023
1024 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1025
1026 rt = addrconf_get_prefix_route(&prefix,
1027 ifp->prefix_len,
1028 ifp->idev->dev,
1029 0, RTF_GATEWAY | RTF_DEFAULT);
1030
1031 if (rt) {
1032 if (onlink == 0) {
1033 ip6_del_rt(rt);
1034 rt = NULL;
1035 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1036 rt6_set_expires(rt, expires);
1037 }
1038 }
1039 ip6_rt_put(rt);
1040 }
1041
1042 /* clean up prefsrc entries */
1043 rt6_remove_prefsrc(ifp);
1044 out:
1045 in6_ifa_put(ifp);
1046 }
1047
1048 #ifdef CONFIG_IPV6_PRIVACY
1049 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1050 {
1051 struct inet6_dev *idev = ifp->idev;
1052 struct in6_addr addr, *tmpaddr;
1053 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1054 unsigned long regen_advance;
1055 int tmp_plen;
1056 int ret = 0;
1057 int max_addresses;
1058 u32 addr_flags;
1059 unsigned long now = jiffies;
1060
1061 write_lock(&idev->lock);
1062 if (ift) {
1063 spin_lock_bh(&ift->lock);
1064 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1065 spin_unlock_bh(&ift->lock);
1066 tmpaddr = &addr;
1067 } else {
1068 tmpaddr = NULL;
1069 }
1070 retry:
1071 in6_dev_hold(idev);
1072 if (idev->cnf.use_tempaddr <= 0) {
1073 write_unlock(&idev->lock);
1074 pr_info("%s: use_tempaddr is disabled\n", __func__);
1075 in6_dev_put(idev);
1076 ret = -1;
1077 goto out;
1078 }
1079 spin_lock_bh(&ifp->lock);
1080 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1081 idev->cnf.use_tempaddr = -1; /*XXX*/
1082 spin_unlock_bh(&ifp->lock);
1083 write_unlock(&idev->lock);
1084 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1085 __func__);
1086 in6_dev_put(idev);
1087 ret = -1;
1088 goto out;
1089 }
1090 in6_ifa_hold(ifp);
1091 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1092 __ipv6_try_regen_rndid(idev, tmpaddr);
1093 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1094 age = (now - ifp->tstamp) / HZ;
1095 tmp_valid_lft = min_t(__u32,
1096 ifp->valid_lft,
1097 idev->cnf.temp_valid_lft + age);
1098 tmp_prefered_lft = min_t(__u32,
1099 ifp->prefered_lft,
1100 idev->cnf.temp_prefered_lft + age -
1101 idev->cnf.max_desync_factor);
1102 tmp_plen = ifp->prefix_len;
1103 max_addresses = idev->cnf.max_addresses;
1104 tmp_tstamp = ifp->tstamp;
1105 spin_unlock_bh(&ifp->lock);
1106
1107 regen_advance = idev->cnf.regen_max_retry *
1108 idev->cnf.dad_transmits *
1109 idev->nd_parms->retrans_time / HZ;
1110 write_unlock(&idev->lock);
1111
1112 /* A temporary address is created only if this calculated Preferred
1113 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1114 * an implementation must not create a temporary address with a zero
1115 * Preferred Lifetime.
1116 */
1117 if (tmp_prefered_lft <= regen_advance) {
1118 in6_ifa_put(ifp);
1119 in6_dev_put(idev);
1120 ret = -1;
1121 goto out;
1122 }
1123
1124 addr_flags = IFA_F_TEMPORARY;
1125 /* set in addrconf_prefix_rcv() */
1126 if (ifp->flags & IFA_F_OPTIMISTIC)
1127 addr_flags |= IFA_F_OPTIMISTIC;
1128
1129 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1130 ipv6_addr_scope(&addr), addr_flags,
1131 tmp_valid_lft, tmp_prefered_lft);
1132 if (IS_ERR(ift)) {
1133 in6_ifa_put(ifp);
1134 in6_dev_put(idev);
1135 pr_info("%s: retry temporary address regeneration\n", __func__);
1136 tmpaddr = &addr;
1137 write_lock(&idev->lock);
1138 goto retry;
1139 }
1140
1141 spin_lock_bh(&ift->lock);
1142 ift->ifpub = ifp;
1143 ift->cstamp = now;
1144 ift->tstamp = tmp_tstamp;
1145 spin_unlock_bh(&ift->lock);
1146
1147 addrconf_dad_start(ift);
1148 in6_ifa_put(ift);
1149 in6_dev_put(idev);
1150 out:
1151 return ret;
1152 }
1153 #endif
1154
1155 /*
1156 * Choose an appropriate source address (RFC3484)
1157 */
1158 enum {
1159 IPV6_SADDR_RULE_INIT = 0,
1160 IPV6_SADDR_RULE_LOCAL,
1161 IPV6_SADDR_RULE_SCOPE,
1162 IPV6_SADDR_RULE_PREFERRED,
1163 #ifdef CONFIG_IPV6_MIP6
1164 IPV6_SADDR_RULE_HOA,
1165 #endif
1166 IPV6_SADDR_RULE_OIF,
1167 IPV6_SADDR_RULE_LABEL,
1168 #ifdef CONFIG_IPV6_PRIVACY
1169 IPV6_SADDR_RULE_PRIVACY,
1170 #endif
1171 IPV6_SADDR_RULE_ORCHID,
1172 IPV6_SADDR_RULE_PREFIX,
1173 IPV6_SADDR_RULE_MAX
1174 };
1175
1176 struct ipv6_saddr_score {
1177 int rule;
1178 int addr_type;
1179 struct inet6_ifaddr *ifa;
1180 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1181 int scopedist;
1182 int matchlen;
1183 };
1184
1185 struct ipv6_saddr_dst {
1186 const struct in6_addr *addr;
1187 int ifindex;
1188 int scope;
1189 int label;
1190 unsigned int prefs;
1191 };
1192
1193 static inline int ipv6_saddr_preferred(int type)
1194 {
1195 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1196 return 1;
1197 return 0;
1198 }
1199
1200 static int ipv6_get_saddr_eval(struct net *net,
1201 struct ipv6_saddr_score *score,
1202 struct ipv6_saddr_dst *dst,
1203 int i)
1204 {
1205 int ret;
1206
1207 if (i <= score->rule) {
1208 switch (i) {
1209 case IPV6_SADDR_RULE_SCOPE:
1210 ret = score->scopedist;
1211 break;
1212 case IPV6_SADDR_RULE_PREFIX:
1213 ret = score->matchlen;
1214 break;
1215 default:
1216 ret = !!test_bit(i, score->scorebits);
1217 }
1218 goto out;
1219 }
1220
1221 switch (i) {
1222 case IPV6_SADDR_RULE_INIT:
1223 /* Rule 0: remember if hiscore is not ready yet */
1224 ret = !!score->ifa;
1225 break;
1226 case IPV6_SADDR_RULE_LOCAL:
1227 /* Rule 1: Prefer same address */
1228 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1229 break;
1230 case IPV6_SADDR_RULE_SCOPE:
1231 /* Rule 2: Prefer appropriate scope
1232 *
1233 * ret
1234 * ^
1235 * -1 | d 15
1236 * ---+--+-+---> scope
1237 * |
1238 * | d is scope of the destination.
1239 * B-d | \
1240 * | \ <- smaller scope is better if
1241 * B-15 | \ if scope is enough for destinaion.
1242 * | ret = B - scope (-1 <= scope >= d <= 15).
1243 * d-C-1 | /
1244 * |/ <- greater is better
1245 * -C / if scope is not enough for destination.
1246 * /| ret = scope - C (-1 <= d < scope <= 15).
1247 *
1248 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1249 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1250 * Assume B = 0 and we get C > 29.
1251 */
1252 ret = __ipv6_addr_src_scope(score->addr_type);
1253 if (ret >= dst->scope)
1254 ret = -ret;
1255 else
1256 ret -= 128; /* 30 is enough */
1257 score->scopedist = ret;
1258 break;
1259 case IPV6_SADDR_RULE_PREFERRED:
1260 /* Rule 3: Avoid deprecated and optimistic addresses */
1261 ret = ipv6_saddr_preferred(score->addr_type) ||
1262 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1263 break;
1264 #ifdef CONFIG_IPV6_MIP6
1265 case IPV6_SADDR_RULE_HOA:
1266 {
1267 /* Rule 4: Prefer home address */
1268 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1269 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1270 break;
1271 }
1272 #endif
1273 case IPV6_SADDR_RULE_OIF:
1274 /* Rule 5: Prefer outgoing interface */
1275 ret = (!dst->ifindex ||
1276 dst->ifindex == score->ifa->idev->dev->ifindex);
1277 break;
1278 case IPV6_SADDR_RULE_LABEL:
1279 /* Rule 6: Prefer matching label */
1280 ret = ipv6_addr_label(net,
1281 &score->ifa->addr, score->addr_type,
1282 score->ifa->idev->dev->ifindex) == dst->label;
1283 break;
1284 #ifdef CONFIG_IPV6_PRIVACY
1285 case IPV6_SADDR_RULE_PRIVACY:
1286 {
1287 /* Rule 7: Prefer public address
1288 * Note: prefer temporary address if use_tempaddr >= 2
1289 */
1290 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1291 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1292 score->ifa->idev->cnf.use_tempaddr >= 2;
1293 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1294 break;
1295 }
1296 #endif
1297 case IPV6_SADDR_RULE_ORCHID:
1298 /* Rule 8-: Prefer ORCHID vs ORCHID or
1299 * non-ORCHID vs non-ORCHID
1300 */
1301 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1302 ipv6_addr_orchid(dst->addr));
1303 break;
1304 case IPV6_SADDR_RULE_PREFIX:
1305 /* Rule 8: Use longest matching prefix */
1306 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1307 if (ret > score->ifa->prefix_len)
1308 ret = score->ifa->prefix_len;
1309 score->matchlen = ret;
1310 break;
1311 default:
1312 ret = 0;
1313 }
1314
1315 if (ret)
1316 __set_bit(i, score->scorebits);
1317 score->rule = i;
1318 out:
1319 return ret;
1320 }
1321
1322 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1323 const struct in6_addr *daddr, unsigned int prefs,
1324 struct in6_addr *saddr)
1325 {
1326 struct ipv6_saddr_score scores[2],
1327 *score = &scores[0], *hiscore = &scores[1];
1328 struct ipv6_saddr_dst dst;
1329 struct net_device *dev;
1330 int dst_type;
1331
1332 dst_type = __ipv6_addr_type(daddr);
1333 dst.addr = daddr;
1334 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1335 dst.scope = __ipv6_addr_src_scope(dst_type);
1336 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1337 dst.prefs = prefs;
1338
1339 hiscore->rule = -1;
1340 hiscore->ifa = NULL;
1341
1342 rcu_read_lock();
1343
1344 for_each_netdev_rcu(net, dev) {
1345 struct inet6_dev *idev;
1346
1347 /* Candidate Source Address (section 4)
1348 * - multicast and link-local destination address,
1349 * the set of candidate source address MUST only
1350 * include addresses assigned to interfaces
1351 * belonging to the same link as the outgoing
1352 * interface.
1353 * (- For site-local destination addresses, the
1354 * set of candidate source addresses MUST only
1355 * include addresses assigned to interfaces
1356 * belonging to the same site as the outgoing
1357 * interface.)
1358 */
1359 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1360 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1361 dst.ifindex && dev->ifindex != dst.ifindex)
1362 continue;
1363
1364 idev = __in6_dev_get(dev);
1365 if (!idev)
1366 continue;
1367
1368 read_lock_bh(&idev->lock);
1369 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1370 int i;
1371
1372 /*
1373 * - Tentative Address (RFC2462 section 5.4)
1374 * - A tentative address is not considered
1375 * "assigned to an interface" in the traditional
1376 * sense, unless it is also flagged as optimistic.
1377 * - Candidate Source Address (section 4)
1378 * - In any case, anycast addresses, multicast
1379 * addresses, and the unspecified address MUST
1380 * NOT be included in a candidate set.
1381 */
1382 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1383 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1384 continue;
1385
1386 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1387
1388 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1389 score->addr_type & IPV6_ADDR_MULTICAST)) {
1390 LIMIT_NETDEBUG(KERN_DEBUG
1391 "ADDRCONF: unspecified / multicast address "
1392 "assigned as unicast address on %s",
1393 dev->name);
1394 continue;
1395 }
1396
1397 score->rule = -1;
1398 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1399
1400 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1401 int minihiscore, miniscore;
1402
1403 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1404 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1405
1406 if (minihiscore > miniscore) {
1407 if (i == IPV6_SADDR_RULE_SCOPE &&
1408 score->scopedist > 0) {
1409 /*
1410 * special case:
1411 * each remaining entry
1412 * has too small (not enough)
1413 * scope, because ifa entries
1414 * are sorted by their scope
1415 * values.
1416 */
1417 goto try_nextdev;
1418 }
1419 break;
1420 } else if (minihiscore < miniscore) {
1421 if (hiscore->ifa)
1422 in6_ifa_put(hiscore->ifa);
1423
1424 in6_ifa_hold(score->ifa);
1425
1426 swap(hiscore, score);
1427
1428 /* restore our iterator */
1429 score->ifa = hiscore->ifa;
1430
1431 break;
1432 }
1433 }
1434 }
1435 try_nextdev:
1436 read_unlock_bh(&idev->lock);
1437 }
1438 rcu_read_unlock();
1439
1440 if (!hiscore->ifa)
1441 return -EADDRNOTAVAIL;
1442
1443 *saddr = hiscore->ifa->addr;
1444 in6_ifa_put(hiscore->ifa);
1445 return 0;
1446 }
1447 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1448
1449 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1450 unsigned char banned_flags)
1451 {
1452 struct inet6_ifaddr *ifp;
1453 int err = -EADDRNOTAVAIL;
1454
1455 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1456 if (ifp->scope == IFA_LINK &&
1457 !(ifp->flags & banned_flags)) {
1458 *addr = ifp->addr;
1459 err = 0;
1460 break;
1461 }
1462 }
1463 return err;
1464 }
1465
1466 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1467 unsigned char banned_flags)
1468 {
1469 struct inet6_dev *idev;
1470 int err = -EADDRNOTAVAIL;
1471
1472 rcu_read_lock();
1473 idev = __in6_dev_get(dev);
1474 if (idev) {
1475 read_lock_bh(&idev->lock);
1476 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1477 read_unlock_bh(&idev->lock);
1478 }
1479 rcu_read_unlock();
1480 return err;
1481 }
1482
1483 static int ipv6_count_addresses(struct inet6_dev *idev)
1484 {
1485 int cnt = 0;
1486 struct inet6_ifaddr *ifp;
1487
1488 read_lock_bh(&idev->lock);
1489 list_for_each_entry(ifp, &idev->addr_list, if_list)
1490 cnt++;
1491 read_unlock_bh(&idev->lock);
1492 return cnt;
1493 }
1494
1495 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1496 const struct net_device *dev, int strict)
1497 {
1498 struct inet6_ifaddr *ifp;
1499 unsigned int hash = inet6_addr_hash(addr);
1500
1501 rcu_read_lock_bh();
1502 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1503 if (!net_eq(dev_net(ifp->idev->dev), net))
1504 continue;
1505 if (ipv6_addr_equal(&ifp->addr, addr) &&
1506 !(ifp->flags&IFA_F_TENTATIVE) &&
1507 (dev == NULL || ifp->idev->dev == dev ||
1508 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1509 rcu_read_unlock_bh();
1510 return 1;
1511 }
1512 }
1513
1514 rcu_read_unlock_bh();
1515 return 0;
1516 }
1517 EXPORT_SYMBOL(ipv6_chk_addr);
1518
1519 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1520 struct net_device *dev)
1521 {
1522 unsigned int hash = inet6_addr_hash(addr);
1523 struct inet6_ifaddr *ifp;
1524
1525 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1526 if (!net_eq(dev_net(ifp->idev->dev), net))
1527 continue;
1528 if (ipv6_addr_equal(&ifp->addr, addr)) {
1529 if (dev == NULL || ifp->idev->dev == dev)
1530 return true;
1531 }
1532 }
1533 return false;
1534 }
1535
1536 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1537 {
1538 struct inet6_dev *idev;
1539 struct inet6_ifaddr *ifa;
1540 int onlink;
1541
1542 onlink = 0;
1543 rcu_read_lock();
1544 idev = __in6_dev_get(dev);
1545 if (idev) {
1546 read_lock_bh(&idev->lock);
1547 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1548 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1549 ifa->prefix_len);
1550 if (onlink)
1551 break;
1552 }
1553 read_unlock_bh(&idev->lock);
1554 }
1555 rcu_read_unlock();
1556 return onlink;
1557 }
1558 EXPORT_SYMBOL(ipv6_chk_prefix);
1559
1560 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1561 struct net_device *dev, int strict)
1562 {
1563 struct inet6_ifaddr *ifp, *result = NULL;
1564 unsigned int hash = inet6_addr_hash(addr);
1565
1566 rcu_read_lock_bh();
1567 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1568 if (!net_eq(dev_net(ifp->idev->dev), net))
1569 continue;
1570 if (ipv6_addr_equal(&ifp->addr, addr)) {
1571 if (dev == NULL || ifp->idev->dev == dev ||
1572 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1573 result = ifp;
1574 in6_ifa_hold(ifp);
1575 break;
1576 }
1577 }
1578 }
1579 rcu_read_unlock_bh();
1580
1581 return result;
1582 }
1583
1584 /* Gets referenced address, destroys ifaddr */
1585
1586 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1587 {
1588 if (ifp->flags&IFA_F_PERMANENT) {
1589 spin_lock_bh(&ifp->lock);
1590 addrconf_del_dad_timer(ifp);
1591 ifp->flags |= IFA_F_TENTATIVE;
1592 if (dad_failed)
1593 ifp->flags |= IFA_F_DADFAILED;
1594 spin_unlock_bh(&ifp->lock);
1595 if (dad_failed)
1596 ipv6_ifa_notify(0, ifp);
1597 in6_ifa_put(ifp);
1598 #ifdef CONFIG_IPV6_PRIVACY
1599 } else if (ifp->flags&IFA_F_TEMPORARY) {
1600 struct inet6_ifaddr *ifpub;
1601 spin_lock_bh(&ifp->lock);
1602 ifpub = ifp->ifpub;
1603 if (ifpub) {
1604 in6_ifa_hold(ifpub);
1605 spin_unlock_bh(&ifp->lock);
1606 ipv6_create_tempaddr(ifpub, ifp);
1607 in6_ifa_put(ifpub);
1608 } else {
1609 spin_unlock_bh(&ifp->lock);
1610 }
1611 ipv6_del_addr(ifp);
1612 #endif
1613 } else
1614 ipv6_del_addr(ifp);
1615 }
1616
1617 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1618 {
1619 int err = -ENOENT;
1620
1621 spin_lock(&ifp->state_lock);
1622 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1623 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1624 err = 0;
1625 }
1626 spin_unlock(&ifp->state_lock);
1627
1628 return err;
1629 }
1630
1631 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1632 {
1633 struct inet6_dev *idev = ifp->idev;
1634
1635 if (addrconf_dad_end(ifp)) {
1636 in6_ifa_put(ifp);
1637 return;
1638 }
1639
1640 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1641 ifp->idev->dev->name, &ifp->addr);
1642
1643 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1644 struct in6_addr addr;
1645
1646 addr.s6_addr32[0] = htonl(0xfe800000);
1647 addr.s6_addr32[1] = 0;
1648
1649 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1650 ipv6_addr_equal(&ifp->addr, &addr)) {
1651 /* DAD failed for link-local based on MAC address */
1652 idev->cnf.disable_ipv6 = 1;
1653
1654 pr_info("%s: IPv6 being disabled!\n",
1655 ifp->idev->dev->name);
1656 }
1657 }
1658
1659 addrconf_dad_stop(ifp, 1);
1660 }
1661
1662 /* Join to solicited addr multicast group. */
1663
1664 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1665 {
1666 struct in6_addr maddr;
1667
1668 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1669 return;
1670
1671 addrconf_addr_solict_mult(addr, &maddr);
1672 ipv6_dev_mc_inc(dev, &maddr);
1673 }
1674
1675 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1676 {
1677 struct in6_addr maddr;
1678
1679 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1680 return;
1681
1682 addrconf_addr_solict_mult(addr, &maddr);
1683 __ipv6_dev_mc_dec(idev, &maddr);
1684 }
1685
1686 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1687 {
1688 struct in6_addr addr;
1689 if (ifp->prefix_len == 127) /* RFC 6164 */
1690 return;
1691 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1692 if (ipv6_addr_any(&addr))
1693 return;
1694 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1695 }
1696
1697 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1698 {
1699 struct in6_addr addr;
1700 if (ifp->prefix_len == 127) /* RFC 6164 */
1701 return;
1702 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1703 if (ipv6_addr_any(&addr))
1704 return;
1705 __ipv6_dev_ac_dec(ifp->idev, &addr);
1706 }
1707
1708 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1709 {
1710 if (dev->addr_len != ETH_ALEN)
1711 return -1;
1712 memcpy(eui, dev->dev_addr, 3);
1713 memcpy(eui + 5, dev->dev_addr + 3, 3);
1714
1715 /*
1716 * The zSeries OSA network cards can be shared among various
1717 * OS instances, but the OSA cards have only one MAC address.
1718 * This leads to duplicate address conflicts in conjunction
1719 * with IPv6 if more than one instance uses the same card.
1720 *
1721 * The driver for these cards can deliver a unique 16-bit
1722 * identifier for each instance sharing the same card. It is
1723 * placed instead of 0xFFFE in the interface identifier. The
1724 * "u" bit of the interface identifier is not inverted in this
1725 * case. Hence the resulting interface identifier has local
1726 * scope according to RFC2373.
1727 */
1728 if (dev->dev_id) {
1729 eui[3] = (dev->dev_id >> 8) & 0xFF;
1730 eui[4] = dev->dev_id & 0xFF;
1731 } else {
1732 eui[3] = 0xFF;
1733 eui[4] = 0xFE;
1734 eui[0] ^= 2;
1735 }
1736 return 0;
1737 }
1738
1739 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1740 {
1741 if (dev->addr_len != IEEE802154_ADDR_LEN)
1742 return -1;
1743 memcpy(eui, dev->dev_addr, 8);
1744 eui[0] ^= 2;
1745 return 0;
1746 }
1747
1748 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1749 {
1750 union fwnet_hwaddr *ha;
1751
1752 if (dev->addr_len != FWNET_ALEN)
1753 return -1;
1754
1755 ha = (union fwnet_hwaddr *)dev->dev_addr;
1756
1757 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1758 eui[0] ^= 2;
1759 return 0;
1760 }
1761
1762 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1763 {
1764 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1765 if (dev->addr_len != ARCNET_ALEN)
1766 return -1;
1767 memset(eui, 0, 7);
1768 eui[7] = *(u8 *)dev->dev_addr;
1769 return 0;
1770 }
1771
1772 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1773 {
1774 if (dev->addr_len != INFINIBAND_ALEN)
1775 return -1;
1776 memcpy(eui, dev->dev_addr + 12, 8);
1777 eui[0] |= 2;
1778 return 0;
1779 }
1780
1781 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1782 {
1783 if (addr == 0)
1784 return -1;
1785 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1786 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1787 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1788 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1789 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1790 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1791 eui[1] = 0;
1792 eui[2] = 0x5E;
1793 eui[3] = 0xFE;
1794 memcpy(eui + 4, &addr, 4);
1795 return 0;
1796 }
1797
1798 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1799 {
1800 if (dev->priv_flags & IFF_ISATAP)
1801 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1802 return -1;
1803 }
1804
1805 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1806 {
1807 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1808 }
1809
1810 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1811 {
1812 switch (dev->type) {
1813 case ARPHRD_ETHER:
1814 case ARPHRD_FDDI:
1815 return addrconf_ifid_eui48(eui, dev);
1816 case ARPHRD_ARCNET:
1817 return addrconf_ifid_arcnet(eui, dev);
1818 case ARPHRD_INFINIBAND:
1819 return addrconf_ifid_infiniband(eui, dev);
1820 case ARPHRD_SIT:
1821 return addrconf_ifid_sit(eui, dev);
1822 case ARPHRD_IPGRE:
1823 return addrconf_ifid_gre(eui, dev);
1824 case ARPHRD_IEEE802154:
1825 return addrconf_ifid_eui64(eui, dev);
1826 case ARPHRD_IEEE1394:
1827 return addrconf_ifid_ieee1394(eui, dev);
1828 }
1829 return -1;
1830 }
1831
1832 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1833 {
1834 int err = -1;
1835 struct inet6_ifaddr *ifp;
1836
1837 read_lock_bh(&idev->lock);
1838 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1839 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1840 memcpy(eui, ifp->addr.s6_addr+8, 8);
1841 err = 0;
1842 break;
1843 }
1844 }
1845 read_unlock_bh(&idev->lock);
1846 return err;
1847 }
1848
1849 #ifdef CONFIG_IPV6_PRIVACY
1850 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1851 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1852 {
1853 regen:
1854 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1855 idev->rndid[0] &= ~0x02;
1856
1857 /*
1858 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1859 * check if generated address is not inappropriate
1860 *
1861 * - Reserved subnet anycast (RFC 2526)
1862 * 11111101 11....11 1xxxxxxx
1863 * - ISATAP (RFC4214) 6.1
1864 * 00-00-5E-FE-xx-xx-xx-xx
1865 * - value 0
1866 * - XXX: already assigned to an address on the device
1867 */
1868 if (idev->rndid[0] == 0xfd &&
1869 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1870 (idev->rndid[7]&0x80))
1871 goto regen;
1872 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1873 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1874 goto regen;
1875 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1876 goto regen;
1877 }
1878 }
1879
1880 static void ipv6_regen_rndid(unsigned long data)
1881 {
1882 struct inet6_dev *idev = (struct inet6_dev *) data;
1883 unsigned long expires;
1884
1885 rcu_read_lock_bh();
1886 write_lock_bh(&idev->lock);
1887
1888 if (idev->dead)
1889 goto out;
1890
1891 __ipv6_regen_rndid(idev);
1892
1893 expires = jiffies +
1894 idev->cnf.temp_prefered_lft * HZ -
1895 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1896 idev->cnf.max_desync_factor * HZ;
1897 if (time_before(expires, jiffies)) {
1898 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1899 __func__, idev->dev->name);
1900 goto out;
1901 }
1902
1903 if (!mod_timer(&idev->regen_timer, expires))
1904 in6_dev_hold(idev);
1905
1906 out:
1907 write_unlock_bh(&idev->lock);
1908 rcu_read_unlock_bh();
1909 in6_dev_put(idev);
1910 }
1911
1912 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1913 {
1914 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1915 __ipv6_regen_rndid(idev);
1916 }
1917 #endif
1918
1919 /*
1920 * Add prefix route.
1921 */
1922
1923 static void
1924 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1925 unsigned long expires, u32 flags)
1926 {
1927 struct fib6_config cfg = {
1928 .fc_table = RT6_TABLE_PREFIX,
1929 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1930 .fc_ifindex = dev->ifindex,
1931 .fc_expires = expires,
1932 .fc_dst_len = plen,
1933 .fc_flags = RTF_UP | flags,
1934 .fc_nlinfo.nl_net = dev_net(dev),
1935 .fc_protocol = RTPROT_KERNEL,
1936 };
1937
1938 cfg.fc_dst = *pfx;
1939
1940 /* Prevent useless cloning on PtP SIT.
1941 This thing is done here expecting that the whole
1942 class of non-broadcast devices need not cloning.
1943 */
1944 #if IS_ENABLED(CONFIG_IPV6_SIT)
1945 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1946 cfg.fc_flags |= RTF_NONEXTHOP;
1947 #endif
1948
1949 ip6_route_add(&cfg);
1950 }
1951
1952
1953 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1954 int plen,
1955 const struct net_device *dev,
1956 u32 flags, u32 noflags)
1957 {
1958 struct fib6_node *fn;
1959 struct rt6_info *rt = NULL;
1960 struct fib6_table *table;
1961
1962 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1963 if (table == NULL)
1964 return NULL;
1965
1966 read_lock_bh(&table->tb6_lock);
1967 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1968 if (!fn)
1969 goto out;
1970 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1971 if (rt->dst.dev->ifindex != dev->ifindex)
1972 continue;
1973 if ((rt->rt6i_flags & flags) != flags)
1974 continue;
1975 if ((rt->rt6i_flags & noflags) != 0)
1976 continue;
1977 dst_hold(&rt->dst);
1978 break;
1979 }
1980 out:
1981 read_unlock_bh(&table->tb6_lock);
1982 return rt;
1983 }
1984
1985
1986 /* Create "default" multicast route to the interface */
1987
1988 static void addrconf_add_mroute(struct net_device *dev)
1989 {
1990 struct fib6_config cfg = {
1991 .fc_table = RT6_TABLE_LOCAL,
1992 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1993 .fc_ifindex = dev->ifindex,
1994 .fc_dst_len = 8,
1995 .fc_flags = RTF_UP,
1996 .fc_nlinfo.nl_net = dev_net(dev),
1997 };
1998
1999 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2000
2001 ip6_route_add(&cfg);
2002 }
2003
2004 #if IS_ENABLED(CONFIG_IPV6_SIT)
2005 static void sit_route_add(struct net_device *dev)
2006 {
2007 struct fib6_config cfg = {
2008 .fc_table = RT6_TABLE_MAIN,
2009 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2010 .fc_ifindex = dev->ifindex,
2011 .fc_dst_len = 96,
2012 .fc_flags = RTF_UP | RTF_NONEXTHOP,
2013 .fc_nlinfo.nl_net = dev_net(dev),
2014 };
2015
2016 /* prefix length - 96 bits "::d.d.d.d" */
2017 ip6_route_add(&cfg);
2018 }
2019 #endif
2020
2021 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2022 {
2023 struct inet6_dev *idev;
2024
2025 ASSERT_RTNL();
2026
2027 idev = ipv6_find_idev(dev);
2028 if (!idev)
2029 return ERR_PTR(-ENOBUFS);
2030
2031 if (idev->cnf.disable_ipv6)
2032 return ERR_PTR(-EACCES);
2033
2034 /* Add default multicast route */
2035 if (!(dev->flags & IFF_LOOPBACK))
2036 addrconf_add_mroute(dev);
2037
2038 return idev;
2039 }
2040
2041 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2042 {
2043 struct prefix_info *pinfo;
2044 __u32 valid_lft;
2045 __u32 prefered_lft;
2046 int addr_type;
2047 struct inet6_dev *in6_dev;
2048 struct net *net = dev_net(dev);
2049
2050 pinfo = (struct prefix_info *) opt;
2051
2052 if (len < sizeof(struct prefix_info)) {
2053 ADBG(("addrconf: prefix option too short\n"));
2054 return;
2055 }
2056
2057 /*
2058 * Validation checks ([ADDRCONF], page 19)
2059 */
2060
2061 addr_type = ipv6_addr_type(&pinfo->prefix);
2062
2063 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2064 return;
2065
2066 valid_lft = ntohl(pinfo->valid);
2067 prefered_lft = ntohl(pinfo->prefered);
2068
2069 if (prefered_lft > valid_lft) {
2070 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2071 return;
2072 }
2073
2074 in6_dev = in6_dev_get(dev);
2075
2076 if (in6_dev == NULL) {
2077 net_dbg_ratelimited("addrconf: device %s not configured\n",
2078 dev->name);
2079 return;
2080 }
2081
2082 /*
2083 * Two things going on here:
2084 * 1) Add routes for on-link prefixes
2085 * 2) Configure prefixes with the auto flag set
2086 */
2087
2088 if (pinfo->onlink) {
2089 struct rt6_info *rt;
2090 unsigned long rt_expires;
2091
2092 /* Avoid arithmetic overflow. Really, we could
2093 * save rt_expires in seconds, likely valid_lft,
2094 * but it would require division in fib gc, that it
2095 * not good.
2096 */
2097 if (HZ > USER_HZ)
2098 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2099 else
2100 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2101
2102 if (addrconf_finite_timeout(rt_expires))
2103 rt_expires *= HZ;
2104
2105 rt = addrconf_get_prefix_route(&pinfo->prefix,
2106 pinfo->prefix_len,
2107 dev,
2108 RTF_ADDRCONF | RTF_PREFIX_RT,
2109 RTF_GATEWAY | RTF_DEFAULT);
2110
2111 if (rt) {
2112 /* Autoconf prefix route */
2113 if (valid_lft == 0) {
2114 ip6_del_rt(rt);
2115 rt = NULL;
2116 } else if (addrconf_finite_timeout(rt_expires)) {
2117 /* not infinity */
2118 rt6_set_expires(rt, jiffies + rt_expires);
2119 } else {
2120 rt6_clean_expires(rt);
2121 }
2122 } else if (valid_lft) {
2123 clock_t expires = 0;
2124 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2125 if (addrconf_finite_timeout(rt_expires)) {
2126 /* not infinity */
2127 flags |= RTF_EXPIRES;
2128 expires = jiffies_to_clock_t(rt_expires);
2129 }
2130 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2131 dev, expires, flags);
2132 }
2133 ip6_rt_put(rt);
2134 }
2135
2136 /* Try to figure out our local address for this prefix */
2137
2138 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2139 struct inet6_ifaddr *ifp;
2140 struct in6_addr addr;
2141 int create = 0, update_lft = 0;
2142 bool tokenized = false;
2143
2144 if (pinfo->prefix_len == 64) {
2145 memcpy(&addr, &pinfo->prefix, 8);
2146
2147 if (!ipv6_addr_any(&in6_dev->token)) {
2148 read_lock_bh(&in6_dev->lock);
2149 memcpy(addr.s6_addr + 8,
2150 in6_dev->token.s6_addr + 8, 8);
2151 read_unlock_bh(&in6_dev->lock);
2152 tokenized = true;
2153 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2154 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2155 in6_dev_put(in6_dev);
2156 return;
2157 }
2158 goto ok;
2159 }
2160 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2161 pinfo->prefix_len);
2162 in6_dev_put(in6_dev);
2163 return;
2164
2165 ok:
2166
2167 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2168
2169 if (ifp == NULL && valid_lft) {
2170 int max_addresses = in6_dev->cnf.max_addresses;
2171 u32 addr_flags = 0;
2172
2173 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2174 if (in6_dev->cnf.optimistic_dad &&
2175 !net->ipv6.devconf_all->forwarding && sllao)
2176 addr_flags = IFA_F_OPTIMISTIC;
2177 #endif
2178
2179 /* Do not allow to create too much of autoconfigured
2180 * addresses; this would be too easy way to crash kernel.
2181 */
2182 if (!max_addresses ||
2183 ipv6_count_addresses(in6_dev) < max_addresses)
2184 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2185 pinfo->prefix_len,
2186 addr_type&IPV6_ADDR_SCOPE_MASK,
2187 addr_flags, valid_lft,
2188 prefered_lft);
2189
2190 if (IS_ERR_OR_NULL(ifp)) {
2191 in6_dev_put(in6_dev);
2192 return;
2193 }
2194
2195 update_lft = 0;
2196 create = 1;
2197 ifp->cstamp = jiffies;
2198 ifp->tokenized = tokenized;
2199 addrconf_dad_start(ifp);
2200 }
2201
2202 if (ifp) {
2203 int flags;
2204 unsigned long now;
2205 #ifdef CONFIG_IPV6_PRIVACY
2206 struct inet6_ifaddr *ift;
2207 #endif
2208 u32 stored_lft;
2209
2210 /* update lifetime (RFC2462 5.5.3 e) */
2211 spin_lock(&ifp->lock);
2212 now = jiffies;
2213 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2214 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2215 else
2216 stored_lft = 0;
2217 if (!update_lft && !create && stored_lft) {
2218 if (valid_lft > MIN_VALID_LIFETIME ||
2219 valid_lft > stored_lft)
2220 update_lft = 1;
2221 else if (stored_lft <= MIN_VALID_LIFETIME) {
2222 /* valid_lft <= stored_lft is always true */
2223 /*
2224 * RFC 4862 Section 5.5.3e:
2225 * "Note that the preferred lifetime of
2226 * the corresponding address is always
2227 * reset to the Preferred Lifetime in
2228 * the received Prefix Information
2229 * option, regardless of whether the
2230 * valid lifetime is also reset or
2231 * ignored."
2232 *
2233 * So if the preferred lifetime in
2234 * this advertisement is different
2235 * than what we have stored, but the
2236 * valid lifetime is invalid, just
2237 * reset prefered_lft.
2238 *
2239 * We must set the valid lifetime
2240 * to the stored lifetime since we'll
2241 * be updating the timestamp below,
2242 * else we'll set it back to the
2243 * minimum.
2244 */
2245 if (prefered_lft != ifp->prefered_lft) {
2246 valid_lft = stored_lft;
2247 update_lft = 1;
2248 }
2249 } else {
2250 valid_lft = MIN_VALID_LIFETIME;
2251 if (valid_lft < prefered_lft)
2252 prefered_lft = valid_lft;
2253 update_lft = 1;
2254 }
2255 }
2256
2257 if (update_lft) {
2258 ifp->valid_lft = valid_lft;
2259 ifp->prefered_lft = prefered_lft;
2260 ifp->tstamp = now;
2261 flags = ifp->flags;
2262 ifp->flags &= ~IFA_F_DEPRECATED;
2263 spin_unlock(&ifp->lock);
2264
2265 if (!(flags&IFA_F_TENTATIVE))
2266 ipv6_ifa_notify(0, ifp);
2267 } else
2268 spin_unlock(&ifp->lock);
2269
2270 #ifdef CONFIG_IPV6_PRIVACY
2271 read_lock_bh(&in6_dev->lock);
2272 /* update all temporary addresses in the list */
2273 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2274 tmp_list) {
2275 int age, max_valid, max_prefered;
2276
2277 if (ifp != ift->ifpub)
2278 continue;
2279
2280 /*
2281 * RFC 4941 section 3.3:
2282 * If a received option will extend the lifetime
2283 * of a public address, the lifetimes of
2284 * temporary addresses should be extended,
2285 * subject to the overall constraint that no
2286 * temporary addresses should ever remain
2287 * "valid" or "preferred" for a time longer than
2288 * (TEMP_VALID_LIFETIME) or
2289 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2290 * respectively.
2291 */
2292 age = (now - ift->cstamp) / HZ;
2293 max_valid = in6_dev->cnf.temp_valid_lft - age;
2294 if (max_valid < 0)
2295 max_valid = 0;
2296
2297 max_prefered = in6_dev->cnf.temp_prefered_lft -
2298 in6_dev->cnf.max_desync_factor -
2299 age;
2300 if (max_prefered < 0)
2301 max_prefered = 0;
2302
2303 if (valid_lft > max_valid)
2304 valid_lft = max_valid;
2305
2306 if (prefered_lft > max_prefered)
2307 prefered_lft = max_prefered;
2308
2309 spin_lock(&ift->lock);
2310 flags = ift->flags;
2311 ift->valid_lft = valid_lft;
2312 ift->prefered_lft = prefered_lft;
2313 ift->tstamp = now;
2314 if (prefered_lft > 0)
2315 ift->flags &= ~IFA_F_DEPRECATED;
2316
2317 spin_unlock(&ift->lock);
2318 if (!(flags&IFA_F_TENTATIVE))
2319 ipv6_ifa_notify(0, ift);
2320 }
2321
2322 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2323 /*
2324 * When a new public address is created as
2325 * described in [ADDRCONF], also create a new
2326 * temporary address. Also create a temporary
2327 * address if it's enabled but no temporary
2328 * address currently exists.
2329 */
2330 read_unlock_bh(&in6_dev->lock);
2331 ipv6_create_tempaddr(ifp, NULL);
2332 } else {
2333 read_unlock_bh(&in6_dev->lock);
2334 }
2335 #endif
2336 in6_ifa_put(ifp);
2337 addrconf_verify(0);
2338 }
2339 }
2340 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2341 in6_dev_put(in6_dev);
2342 }
2343
2344 /*
2345 * Set destination address.
2346 * Special case for SIT interfaces where we create a new "virtual"
2347 * device.
2348 */
2349 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2350 {
2351 struct in6_ifreq ireq;
2352 struct net_device *dev;
2353 int err = -EINVAL;
2354
2355 rtnl_lock();
2356
2357 err = -EFAULT;
2358 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2359 goto err_exit;
2360
2361 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2362
2363 err = -ENODEV;
2364 if (dev == NULL)
2365 goto err_exit;
2366
2367 #if IS_ENABLED(CONFIG_IPV6_SIT)
2368 if (dev->type == ARPHRD_SIT) {
2369 const struct net_device_ops *ops = dev->netdev_ops;
2370 struct ifreq ifr;
2371 struct ip_tunnel_parm p;
2372
2373 err = -EADDRNOTAVAIL;
2374 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2375 goto err_exit;
2376
2377 memset(&p, 0, sizeof(p));
2378 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2379 p.iph.saddr = 0;
2380 p.iph.version = 4;
2381 p.iph.ihl = 5;
2382 p.iph.protocol = IPPROTO_IPV6;
2383 p.iph.ttl = 64;
2384 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2385
2386 if (ops->ndo_do_ioctl) {
2387 mm_segment_t oldfs = get_fs();
2388
2389 set_fs(KERNEL_DS);
2390 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2391 set_fs(oldfs);
2392 } else
2393 err = -EOPNOTSUPP;
2394
2395 if (err == 0) {
2396 err = -ENOBUFS;
2397 dev = __dev_get_by_name(net, p.name);
2398 if (!dev)
2399 goto err_exit;
2400 err = dev_open(dev);
2401 }
2402 }
2403 #endif
2404
2405 err_exit:
2406 rtnl_unlock();
2407 return err;
2408 }
2409
2410 /*
2411 * Manual configuration of address on an interface
2412 */
2413 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2414 const struct in6_addr *peer_pfx,
2415 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2416 __u32 valid_lft)
2417 {
2418 struct inet6_ifaddr *ifp;
2419 struct inet6_dev *idev;
2420 struct net_device *dev;
2421 int scope;
2422 u32 flags;
2423 clock_t expires;
2424 unsigned long timeout;
2425
2426 ASSERT_RTNL();
2427
2428 if (plen > 128)
2429 return -EINVAL;
2430
2431 /* check the lifetime */
2432 if (!valid_lft || prefered_lft > valid_lft)
2433 return -EINVAL;
2434
2435 dev = __dev_get_by_index(net, ifindex);
2436 if (!dev)
2437 return -ENODEV;
2438
2439 idev = addrconf_add_dev(dev);
2440 if (IS_ERR(idev))
2441 return PTR_ERR(idev);
2442
2443 scope = ipv6_addr_scope(pfx);
2444
2445 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2446 if (addrconf_finite_timeout(timeout)) {
2447 expires = jiffies_to_clock_t(timeout * HZ);
2448 valid_lft = timeout;
2449 flags = RTF_EXPIRES;
2450 } else {
2451 expires = 0;
2452 flags = 0;
2453 ifa_flags |= IFA_F_PERMANENT;
2454 }
2455
2456 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2457 if (addrconf_finite_timeout(timeout)) {
2458 if (timeout == 0)
2459 ifa_flags |= IFA_F_DEPRECATED;
2460 prefered_lft = timeout;
2461 }
2462
2463 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2464 valid_lft, prefered_lft);
2465
2466 if (!IS_ERR(ifp)) {
2467 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2468 expires, flags);
2469 /*
2470 * Note that section 3.1 of RFC 4429 indicates
2471 * that the Optimistic flag should not be set for
2472 * manually configured addresses
2473 */
2474 addrconf_dad_start(ifp);
2475 in6_ifa_put(ifp);
2476 addrconf_verify(0);
2477 return 0;
2478 }
2479
2480 return PTR_ERR(ifp);
2481 }
2482
2483 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2484 unsigned int plen)
2485 {
2486 struct inet6_ifaddr *ifp;
2487 struct inet6_dev *idev;
2488 struct net_device *dev;
2489
2490 if (plen > 128)
2491 return -EINVAL;
2492
2493 dev = __dev_get_by_index(net, ifindex);
2494 if (!dev)
2495 return -ENODEV;
2496
2497 if ((idev = __in6_dev_get(dev)) == NULL)
2498 return -ENXIO;
2499
2500 read_lock_bh(&idev->lock);
2501 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2502 if (ifp->prefix_len == plen &&
2503 ipv6_addr_equal(pfx, &ifp->addr)) {
2504 in6_ifa_hold(ifp);
2505 read_unlock_bh(&idev->lock);
2506
2507 ipv6_del_addr(ifp);
2508 return 0;
2509 }
2510 }
2511 read_unlock_bh(&idev->lock);
2512 return -EADDRNOTAVAIL;
2513 }
2514
2515
2516 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2517 {
2518 struct in6_ifreq ireq;
2519 int err;
2520
2521 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2522 return -EPERM;
2523
2524 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2525 return -EFAULT;
2526
2527 rtnl_lock();
2528 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2529 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2530 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2531 rtnl_unlock();
2532 return err;
2533 }
2534
2535 int addrconf_del_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_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2548 ireq.ifr6_prefixlen);
2549 rtnl_unlock();
2550 return err;
2551 }
2552
2553 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2554 int plen, int scope)
2555 {
2556 struct inet6_ifaddr *ifp;
2557
2558 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2559 scope, IFA_F_PERMANENT, 0, 0);
2560 if (!IS_ERR(ifp)) {
2561 spin_lock_bh(&ifp->lock);
2562 ifp->flags &= ~IFA_F_TENTATIVE;
2563 spin_unlock_bh(&ifp->lock);
2564 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2565 in6_ifa_put(ifp);
2566 }
2567 }
2568
2569 #if IS_ENABLED(CONFIG_IPV6_SIT)
2570 static void sit_add_v4_addrs(struct inet6_dev *idev)
2571 {
2572 struct in6_addr addr;
2573 struct net_device *dev;
2574 struct net *net = dev_net(idev->dev);
2575 int scope;
2576
2577 ASSERT_RTNL();
2578
2579 memset(&addr, 0, sizeof(struct in6_addr));
2580 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2581
2582 if (idev->dev->flags&IFF_POINTOPOINT) {
2583 addr.s6_addr32[0] = htonl(0xfe800000);
2584 scope = IFA_LINK;
2585 } else {
2586 scope = IPV6_ADDR_COMPATv4;
2587 }
2588
2589 if (addr.s6_addr32[3]) {
2590 add_addr(idev, &addr, 128, scope);
2591 return;
2592 }
2593
2594 for_each_netdev(net, dev) {
2595 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2596 if (in_dev && (dev->flags & IFF_UP)) {
2597 struct in_ifaddr *ifa;
2598
2599 int flag = scope;
2600
2601 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2602 int plen;
2603
2604 addr.s6_addr32[3] = ifa->ifa_local;
2605
2606 if (ifa->ifa_scope == RT_SCOPE_LINK)
2607 continue;
2608 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2609 if (idev->dev->flags&IFF_POINTOPOINT)
2610 continue;
2611 flag |= IFA_HOST;
2612 }
2613 if (idev->dev->flags&IFF_POINTOPOINT)
2614 plen = 64;
2615 else
2616 plen = 96;
2617
2618 add_addr(idev, &addr, plen, flag);
2619 }
2620 }
2621 }
2622 }
2623 #endif
2624
2625 static void init_loopback(struct net_device *dev)
2626 {
2627 struct inet6_dev *idev;
2628 struct net_device *sp_dev;
2629 struct inet6_ifaddr *sp_ifa;
2630 struct rt6_info *sp_rt;
2631
2632 /* ::1 */
2633
2634 ASSERT_RTNL();
2635
2636 if ((idev = ipv6_find_idev(dev)) == NULL) {
2637 pr_debug("%s: add_dev failed\n", __func__);
2638 return;
2639 }
2640
2641 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2642
2643 /* Add routes to other interface's IPv6 addresses */
2644 for_each_netdev(dev_net(dev), sp_dev) {
2645 if (!strcmp(sp_dev->name, dev->name))
2646 continue;
2647
2648 idev = __in6_dev_get(sp_dev);
2649 if (!idev)
2650 continue;
2651
2652 read_lock_bh(&idev->lock);
2653 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2654
2655 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2656 continue;
2657
2658 if (sp_ifa->rt)
2659 continue;
2660
2661 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
2662
2663 /* Failure cases are ignored */
2664 if (!IS_ERR(sp_rt)) {
2665 sp_ifa->rt = sp_rt;
2666 ip6_ins_rt(sp_rt);
2667 }
2668 }
2669 read_unlock_bh(&idev->lock);
2670 }
2671 }
2672
2673 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2674 {
2675 struct inet6_ifaddr *ifp;
2676 u32 addr_flags = IFA_F_PERMANENT;
2677
2678 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2679 if (idev->cnf.optimistic_dad &&
2680 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2681 addr_flags |= IFA_F_OPTIMISTIC;
2682 #endif
2683
2684
2685 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
2686 if (!IS_ERR(ifp)) {
2687 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2688 addrconf_dad_start(ifp);
2689 in6_ifa_put(ifp);
2690 }
2691 }
2692
2693 static void addrconf_dev_config(struct net_device *dev)
2694 {
2695 struct in6_addr addr;
2696 struct inet6_dev *idev;
2697
2698 ASSERT_RTNL();
2699
2700 if ((dev->type != ARPHRD_ETHER) &&
2701 (dev->type != ARPHRD_FDDI) &&
2702 (dev->type != ARPHRD_ARCNET) &&
2703 (dev->type != ARPHRD_INFINIBAND) &&
2704 (dev->type != ARPHRD_IEEE802154) &&
2705 (dev->type != ARPHRD_IEEE1394)) {
2706 /* Alas, we support only Ethernet autoconfiguration. */
2707 return;
2708 }
2709
2710 idev = addrconf_add_dev(dev);
2711 if (IS_ERR(idev))
2712 return;
2713
2714 memset(&addr, 0, sizeof(struct in6_addr));
2715 addr.s6_addr32[0] = htonl(0xFE800000);
2716
2717 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2718 addrconf_add_linklocal(idev, &addr);
2719 }
2720
2721 #if IS_ENABLED(CONFIG_IPV6_SIT)
2722 static void addrconf_sit_config(struct net_device *dev)
2723 {
2724 struct inet6_dev *idev;
2725
2726 ASSERT_RTNL();
2727
2728 /*
2729 * Configure the tunnel with one of our IPv4
2730 * addresses... we should configure all of
2731 * our v4 addrs in the tunnel
2732 */
2733
2734 if ((idev = ipv6_find_idev(dev)) == NULL) {
2735 pr_debug("%s: add_dev failed\n", __func__);
2736 return;
2737 }
2738
2739 if (dev->priv_flags & IFF_ISATAP) {
2740 struct in6_addr addr;
2741
2742 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2743 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2744 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2745 addrconf_add_linklocal(idev, &addr);
2746 return;
2747 }
2748
2749 sit_add_v4_addrs(idev);
2750
2751 if (dev->flags&IFF_POINTOPOINT)
2752 addrconf_add_mroute(dev);
2753 else
2754 sit_route_add(dev);
2755 }
2756 #endif
2757
2758 #if IS_ENABLED(CONFIG_NET_IPGRE)
2759 static void addrconf_gre_config(struct net_device *dev)
2760 {
2761 struct inet6_dev *idev;
2762 struct in6_addr addr;
2763
2764 ASSERT_RTNL();
2765
2766 if ((idev = ipv6_find_idev(dev)) == NULL) {
2767 pr_debug("%s: add_dev failed\n", __func__);
2768 return;
2769 }
2770
2771 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2772 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2773
2774 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2775 addrconf_add_linklocal(idev, &addr);
2776 }
2777 #endif
2778
2779 static inline int
2780 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2781 {
2782 struct in6_addr lladdr;
2783
2784 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2785 addrconf_add_linklocal(idev, &lladdr);
2786 return 0;
2787 }
2788 return -1;
2789 }
2790
2791 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2792 {
2793 struct net_device *link_dev;
2794 struct net *net = dev_net(idev->dev);
2795
2796 /* first try to inherit the link-local address from the link device */
2797 if (idev->dev->iflink &&
2798 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2799 if (!ipv6_inherit_linklocal(idev, link_dev))
2800 return;
2801 }
2802 /* then try to inherit it from any device */
2803 for_each_netdev(net, link_dev) {
2804 if (!ipv6_inherit_linklocal(idev, link_dev))
2805 return;
2806 }
2807 pr_debug("init ip6-ip6: add_linklocal failed\n");
2808 }
2809
2810 /*
2811 * Autoconfigure tunnel with a link-local address so routing protocols,
2812 * DHCPv6, MLD etc. can be run over the virtual link
2813 */
2814
2815 static void addrconf_ip6_tnl_config(struct net_device *dev)
2816 {
2817 struct inet6_dev *idev;
2818
2819 ASSERT_RTNL();
2820
2821 idev = addrconf_add_dev(dev);
2822 if (IS_ERR(idev)) {
2823 pr_debug("init ip6-ip6: add_dev failed\n");
2824 return;
2825 }
2826 ip6_tnl_add_linklocal(idev);
2827 }
2828
2829 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2830 void *ptr)
2831 {
2832 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2833 struct inet6_dev *idev = __in6_dev_get(dev);
2834 int run_pending = 0;
2835 int err;
2836
2837 switch (event) {
2838 case NETDEV_REGISTER:
2839 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2840 idev = ipv6_add_dev(dev);
2841 if (!idev)
2842 return notifier_from_errno(-ENOMEM);
2843 }
2844 break;
2845
2846 case NETDEV_UP:
2847 case NETDEV_CHANGE:
2848 if (dev->flags & IFF_SLAVE)
2849 break;
2850
2851 if (event == NETDEV_UP) {
2852 if (!addrconf_qdisc_ok(dev)) {
2853 /* device is not ready yet. */
2854 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2855 dev->name);
2856 break;
2857 }
2858
2859 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2860 idev = ipv6_add_dev(dev);
2861
2862 if (idev) {
2863 idev->if_flags |= IF_READY;
2864 run_pending = 1;
2865 }
2866 } else {
2867 if (!addrconf_qdisc_ok(dev)) {
2868 /* device is still not ready. */
2869 break;
2870 }
2871
2872 if (idev) {
2873 if (idev->if_flags & IF_READY)
2874 /* device is already configured. */
2875 break;
2876 idev->if_flags |= IF_READY;
2877 }
2878
2879 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2880 dev->name);
2881
2882 run_pending = 1;
2883 }
2884
2885 switch (dev->type) {
2886 #if IS_ENABLED(CONFIG_IPV6_SIT)
2887 case ARPHRD_SIT:
2888 addrconf_sit_config(dev);
2889 break;
2890 #endif
2891 #if IS_ENABLED(CONFIG_NET_IPGRE)
2892 case ARPHRD_IPGRE:
2893 addrconf_gre_config(dev);
2894 break;
2895 #endif
2896 case ARPHRD_TUNNEL6:
2897 addrconf_ip6_tnl_config(dev);
2898 break;
2899 case ARPHRD_LOOPBACK:
2900 init_loopback(dev);
2901 break;
2902
2903 default:
2904 addrconf_dev_config(dev);
2905 break;
2906 }
2907
2908 if (idev) {
2909 if (run_pending)
2910 addrconf_dad_run(idev);
2911
2912 /*
2913 * If the MTU changed during the interface down,
2914 * when the interface up, the changed MTU must be
2915 * reflected in the idev as well as routers.
2916 */
2917 if (idev->cnf.mtu6 != dev->mtu &&
2918 dev->mtu >= IPV6_MIN_MTU) {
2919 rt6_mtu_change(dev, dev->mtu);
2920 idev->cnf.mtu6 = dev->mtu;
2921 }
2922 idev->tstamp = jiffies;
2923 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2924
2925 /*
2926 * If the changed mtu during down is lower than
2927 * IPV6_MIN_MTU stop IPv6 on this interface.
2928 */
2929 if (dev->mtu < IPV6_MIN_MTU)
2930 addrconf_ifdown(dev, 1);
2931 }
2932 break;
2933
2934 case NETDEV_CHANGEMTU:
2935 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2936 rt6_mtu_change(dev, dev->mtu);
2937 idev->cnf.mtu6 = dev->mtu;
2938 break;
2939 }
2940
2941 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2942 idev = ipv6_add_dev(dev);
2943 if (idev)
2944 break;
2945 }
2946
2947 /*
2948 * MTU falled under IPV6_MIN_MTU.
2949 * Stop IPv6 on this interface.
2950 */
2951
2952 case NETDEV_DOWN:
2953 case NETDEV_UNREGISTER:
2954 /*
2955 * Remove all addresses from this interface.
2956 */
2957 addrconf_ifdown(dev, event != NETDEV_DOWN);
2958 break;
2959
2960 case NETDEV_CHANGENAME:
2961 if (idev) {
2962 snmp6_unregister_dev(idev);
2963 addrconf_sysctl_unregister(idev);
2964 addrconf_sysctl_register(idev);
2965 err = snmp6_register_dev(idev);
2966 if (err)
2967 return notifier_from_errno(err);
2968 }
2969 break;
2970
2971 case NETDEV_PRE_TYPE_CHANGE:
2972 case NETDEV_POST_TYPE_CHANGE:
2973 addrconf_type_change(dev, event);
2974 break;
2975 }
2976
2977 return NOTIFY_OK;
2978 }
2979
2980 /*
2981 * addrconf module should be notified of a device going up
2982 */
2983 static struct notifier_block ipv6_dev_notf = {
2984 .notifier_call = addrconf_notify,
2985 };
2986
2987 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2988 {
2989 struct inet6_dev *idev;
2990 ASSERT_RTNL();
2991
2992 idev = __in6_dev_get(dev);
2993
2994 if (event == NETDEV_POST_TYPE_CHANGE)
2995 ipv6_mc_remap(idev);
2996 else if (event == NETDEV_PRE_TYPE_CHANGE)
2997 ipv6_mc_unmap(idev);
2998 }
2999
3000 static int addrconf_ifdown(struct net_device *dev, int how)
3001 {
3002 struct net *net = dev_net(dev);
3003 struct inet6_dev *idev;
3004 struct inet6_ifaddr *ifa;
3005 int state, i;
3006
3007 ASSERT_RTNL();
3008
3009 rt6_ifdown(net, dev);
3010 neigh_ifdown(&nd_tbl, dev);
3011
3012 idev = __in6_dev_get(dev);
3013 if (idev == NULL)
3014 return -ENODEV;
3015
3016 /*
3017 * Step 1: remove reference to ipv6 device from parent device.
3018 * Do not dev_put!
3019 */
3020 if (how) {
3021 idev->dead = 1;
3022
3023 /* protected by rtnl_lock */
3024 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3025
3026 /* Step 1.5: remove snmp6 entry */
3027 snmp6_unregister_dev(idev);
3028
3029 }
3030
3031 /* Step 2: clear hash table */
3032 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3033 struct hlist_head *h = &inet6_addr_lst[i];
3034
3035 spin_lock_bh(&addrconf_hash_lock);
3036 restart:
3037 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3038 if (ifa->idev == idev) {
3039 hlist_del_init_rcu(&ifa->addr_lst);
3040 addrconf_del_dad_timer(ifa);
3041 goto restart;
3042 }
3043 }
3044 spin_unlock_bh(&addrconf_hash_lock);
3045 }
3046
3047 write_lock_bh(&idev->lock);
3048
3049 addrconf_del_rs_timer(idev);
3050
3051 /* Step 2: clear flags for stateless addrconf */
3052 if (!how)
3053 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3054
3055 #ifdef CONFIG_IPV6_PRIVACY
3056 if (how && del_timer(&idev->regen_timer))
3057 in6_dev_put(idev);
3058
3059 /* Step 3: clear tempaddr list */
3060 while (!list_empty(&idev->tempaddr_list)) {
3061 ifa = list_first_entry(&idev->tempaddr_list,
3062 struct inet6_ifaddr, tmp_list);
3063 list_del(&ifa->tmp_list);
3064 write_unlock_bh(&idev->lock);
3065 spin_lock_bh(&ifa->lock);
3066
3067 if (ifa->ifpub) {
3068 in6_ifa_put(ifa->ifpub);
3069 ifa->ifpub = NULL;
3070 }
3071 spin_unlock_bh(&ifa->lock);
3072 in6_ifa_put(ifa);
3073 write_lock_bh(&idev->lock);
3074 }
3075 #endif
3076
3077 while (!list_empty(&idev->addr_list)) {
3078 ifa = list_first_entry(&idev->addr_list,
3079 struct inet6_ifaddr, if_list);
3080 addrconf_del_dad_timer(ifa);
3081
3082 list_del(&ifa->if_list);
3083
3084 write_unlock_bh(&idev->lock);
3085
3086 spin_lock_bh(&ifa->state_lock);
3087 state = ifa->state;
3088 ifa->state = INET6_IFADDR_STATE_DEAD;
3089 spin_unlock_bh(&ifa->state_lock);
3090
3091 if (state != INET6_IFADDR_STATE_DEAD) {
3092 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3093 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3094 }
3095 in6_ifa_put(ifa);
3096
3097 write_lock_bh(&idev->lock);
3098 }
3099
3100 write_unlock_bh(&idev->lock);
3101
3102 /* Step 5: Discard multicast list */
3103 if (how)
3104 ipv6_mc_destroy_dev(idev);
3105 else
3106 ipv6_mc_down(idev);
3107
3108 idev->tstamp = jiffies;
3109
3110 /* Last: Shot the device (if unregistered) */
3111 if (how) {
3112 addrconf_sysctl_unregister(idev);
3113 neigh_parms_release(&nd_tbl, idev->nd_parms);
3114 neigh_ifdown(&nd_tbl, dev);
3115 in6_dev_put(idev);
3116 }
3117 return 0;
3118 }
3119
3120 static void addrconf_rs_timer(unsigned long data)
3121 {
3122 struct inet6_dev *idev = (struct inet6_dev *)data;
3123 struct in6_addr lladdr;
3124
3125 write_lock(&idev->lock);
3126 if (idev->dead || !(idev->if_flags & IF_READY))
3127 goto out;
3128
3129 if (!ipv6_accept_ra(idev))
3130 goto out;
3131
3132 /* Announcement received after solicitation was sent */
3133 if (idev->if_flags & IF_RA_RCVD)
3134 goto out;
3135
3136 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3137 if (!__ipv6_get_lladdr(idev, &lladdr, IFA_F_TENTATIVE))
3138 ndisc_send_rs(idev->dev, &lladdr,
3139 &in6addr_linklocal_allrouters);
3140 else
3141 goto out;
3142
3143 /* The wait after the last probe can be shorter */
3144 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3145 idev->cnf.rtr_solicits) ?
3146 idev->cnf.rtr_solicit_delay :
3147 idev->cnf.rtr_solicit_interval);
3148 } else {
3149 /*
3150 * Note: we do not support deprecated "all on-link"
3151 * assumption any longer.
3152 */
3153 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3154 }
3155
3156 out:
3157 write_unlock(&idev->lock);
3158 in6_dev_put(idev);
3159 }
3160
3161 /*
3162 * Duplicate Address Detection
3163 */
3164 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3165 {
3166 unsigned long rand_num;
3167 struct inet6_dev *idev = ifp->idev;
3168
3169 if (ifp->flags & IFA_F_OPTIMISTIC)
3170 rand_num = 0;
3171 else
3172 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3173
3174 ifp->dad_probes = idev->cnf.dad_transmits;
3175 addrconf_mod_dad_timer(ifp, rand_num);
3176 }
3177
3178 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3179 {
3180 struct inet6_dev *idev = ifp->idev;
3181 struct net_device *dev = idev->dev;
3182
3183 addrconf_join_solict(dev, &ifp->addr);
3184
3185 net_srandom(ifp->addr.s6_addr32[3]);
3186
3187 read_lock_bh(&idev->lock);
3188 spin_lock(&ifp->lock);
3189 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3190 goto out;
3191
3192 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3193 idev->cnf.accept_dad < 1 ||
3194 !(ifp->flags&IFA_F_TENTATIVE) ||
3195 ifp->flags & IFA_F_NODAD) {
3196 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3197 spin_unlock(&ifp->lock);
3198 read_unlock_bh(&idev->lock);
3199
3200 addrconf_dad_completed(ifp);
3201 return;
3202 }
3203
3204 if (!(idev->if_flags & IF_READY)) {
3205 spin_unlock(&ifp->lock);
3206 read_unlock_bh(&idev->lock);
3207 /*
3208 * If the device is not ready:
3209 * - keep it tentative if it is a permanent address.
3210 * - otherwise, kill it.
3211 */
3212 in6_ifa_hold(ifp);
3213 addrconf_dad_stop(ifp, 0);
3214 return;
3215 }
3216
3217 /*
3218 * Optimistic nodes can start receiving
3219 * Frames right away
3220 */
3221 if (ifp->flags & IFA_F_OPTIMISTIC)
3222 ip6_ins_rt(ifp->rt);
3223
3224 addrconf_dad_kick(ifp);
3225 out:
3226 spin_unlock(&ifp->lock);
3227 read_unlock_bh(&idev->lock);
3228 }
3229
3230 static void addrconf_dad_timer(unsigned long data)
3231 {
3232 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3233 struct inet6_dev *idev = ifp->idev;
3234 struct in6_addr mcaddr;
3235
3236 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3237 goto out;
3238
3239 write_lock(&idev->lock);
3240 if (idev->dead || !(idev->if_flags & IF_READY)) {
3241 write_unlock(&idev->lock);
3242 goto out;
3243 }
3244
3245 spin_lock(&ifp->lock);
3246 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3247 spin_unlock(&ifp->lock);
3248 write_unlock(&idev->lock);
3249 goto out;
3250 }
3251
3252 if (ifp->dad_probes == 0) {
3253 /*
3254 * DAD was successful
3255 */
3256
3257 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3258 spin_unlock(&ifp->lock);
3259 write_unlock(&idev->lock);
3260
3261 addrconf_dad_completed(ifp);
3262
3263 goto out;
3264 }
3265
3266 ifp->dad_probes--;
3267 addrconf_mod_dad_timer(ifp, ifp->idev->nd_parms->retrans_time);
3268 spin_unlock(&ifp->lock);
3269 write_unlock(&idev->lock);
3270
3271 /* send a neighbour solicitation for our addr */
3272 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3273 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3274 out:
3275 in6_ifa_put(ifp);
3276 }
3277
3278 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3279 {
3280 struct net_device *dev = ifp->idev->dev;
3281 struct in6_addr lladdr;
3282 bool send_rs, send_mld;
3283
3284 addrconf_del_dad_timer(ifp);
3285
3286 /*
3287 * Configure the address for reception. Now it is valid.
3288 */
3289
3290 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3291
3292 /* If added prefix is link local and we are prepared to process
3293 router advertisements, start sending router solicitations.
3294 */
3295
3296 read_lock_bh(&ifp->idev->lock);
3297 spin_lock(&ifp->lock);
3298 send_mld = ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL &&
3299 ifp->idev->valid_ll_addr_cnt == 1;
3300 send_rs = send_mld &&
3301 ipv6_accept_ra(ifp->idev) &&
3302 ifp->idev->cnf.rtr_solicits > 0 &&
3303 (dev->flags&IFF_LOOPBACK) == 0;
3304 spin_unlock(&ifp->lock);
3305 read_unlock_bh(&ifp->idev->lock);
3306
3307 /* While dad is in progress mld report's source address is in6_addrany.
3308 * Resend with proper ll now.
3309 */
3310 if (send_mld)
3311 ipv6_mc_dad_complete(ifp->idev);
3312
3313 if (send_rs) {
3314 /*
3315 * If a host as already performed a random delay
3316 * [...] as part of DAD [...] there is no need
3317 * to delay again before sending the first RS
3318 */
3319 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3320 return;
3321 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3322
3323 write_lock_bh(&ifp->idev->lock);
3324 spin_lock(&ifp->lock);
3325 ifp->idev->rs_probes = 1;
3326 ifp->idev->if_flags |= IF_RS_SENT;
3327 addrconf_mod_rs_timer(ifp->idev,
3328 ifp->idev->cnf.rtr_solicit_interval);
3329 spin_unlock(&ifp->lock);
3330 write_unlock_bh(&ifp->idev->lock);
3331 }
3332 }
3333
3334 static void addrconf_dad_run(struct inet6_dev *idev)
3335 {
3336 struct inet6_ifaddr *ifp;
3337
3338 read_lock_bh(&idev->lock);
3339 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3340 spin_lock(&ifp->lock);
3341 if (ifp->flags & IFA_F_TENTATIVE &&
3342 ifp->state == INET6_IFADDR_STATE_DAD)
3343 addrconf_dad_kick(ifp);
3344 spin_unlock(&ifp->lock);
3345 }
3346 read_unlock_bh(&idev->lock);
3347 }
3348
3349 #ifdef CONFIG_PROC_FS
3350 struct if6_iter_state {
3351 struct seq_net_private p;
3352 int bucket;
3353 int offset;
3354 };
3355
3356 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3357 {
3358 struct inet6_ifaddr *ifa = NULL;
3359 struct if6_iter_state *state = seq->private;
3360 struct net *net = seq_file_net(seq);
3361 int p = 0;
3362
3363 /* initial bucket if pos is 0 */
3364 if (pos == 0) {
3365 state->bucket = 0;
3366 state->offset = 0;
3367 }
3368
3369 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3370 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3371 addr_lst) {
3372 if (!net_eq(dev_net(ifa->idev->dev), net))
3373 continue;
3374 /* sync with offset */
3375 if (p < state->offset) {
3376 p++;
3377 continue;
3378 }
3379 state->offset++;
3380 return ifa;
3381 }
3382
3383 /* prepare for next bucket */
3384 state->offset = 0;
3385 p = 0;
3386 }
3387 return NULL;
3388 }
3389
3390 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3391 struct inet6_ifaddr *ifa)
3392 {
3393 struct if6_iter_state *state = seq->private;
3394 struct net *net = seq_file_net(seq);
3395
3396 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3397 if (!net_eq(dev_net(ifa->idev->dev), net))
3398 continue;
3399 state->offset++;
3400 return ifa;
3401 }
3402
3403 while (++state->bucket < IN6_ADDR_HSIZE) {
3404 state->offset = 0;
3405 hlist_for_each_entry_rcu_bh(ifa,
3406 &inet6_addr_lst[state->bucket], addr_lst) {
3407 if (!net_eq(dev_net(ifa->idev->dev), net))
3408 continue;
3409 state->offset++;
3410 return ifa;
3411 }
3412 }
3413
3414 return NULL;
3415 }
3416
3417 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3418 __acquires(rcu_bh)
3419 {
3420 rcu_read_lock_bh();
3421 return if6_get_first(seq, *pos);
3422 }
3423
3424 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3425 {
3426 struct inet6_ifaddr *ifa;
3427
3428 ifa = if6_get_next(seq, v);
3429 ++*pos;
3430 return ifa;
3431 }
3432
3433 static void if6_seq_stop(struct seq_file *seq, void *v)
3434 __releases(rcu_bh)
3435 {
3436 rcu_read_unlock_bh();
3437 }
3438
3439 static int if6_seq_show(struct seq_file *seq, void *v)
3440 {
3441 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3442 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3443 &ifp->addr,
3444 ifp->idev->dev->ifindex,
3445 ifp->prefix_len,
3446 ifp->scope,
3447 ifp->flags,
3448 ifp->idev->dev->name);
3449 return 0;
3450 }
3451
3452 static const struct seq_operations if6_seq_ops = {
3453 .start = if6_seq_start,
3454 .next = if6_seq_next,
3455 .show = if6_seq_show,
3456 .stop = if6_seq_stop,
3457 };
3458
3459 static int if6_seq_open(struct inode *inode, struct file *file)
3460 {
3461 return seq_open_net(inode, file, &if6_seq_ops,
3462 sizeof(struct if6_iter_state));
3463 }
3464
3465 static const struct file_operations if6_fops = {
3466 .owner = THIS_MODULE,
3467 .open = if6_seq_open,
3468 .read = seq_read,
3469 .llseek = seq_lseek,
3470 .release = seq_release_net,
3471 };
3472
3473 static int __net_init if6_proc_net_init(struct net *net)
3474 {
3475 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3476 return -ENOMEM;
3477 return 0;
3478 }
3479
3480 static void __net_exit if6_proc_net_exit(struct net *net)
3481 {
3482 remove_proc_entry("if_inet6", net->proc_net);
3483 }
3484
3485 static struct pernet_operations if6_proc_net_ops = {
3486 .init = if6_proc_net_init,
3487 .exit = if6_proc_net_exit,
3488 };
3489
3490 int __init if6_proc_init(void)
3491 {
3492 return register_pernet_subsys(&if6_proc_net_ops);
3493 }
3494
3495 void if6_proc_exit(void)
3496 {
3497 unregister_pernet_subsys(&if6_proc_net_ops);
3498 }
3499 #endif /* CONFIG_PROC_FS */
3500
3501 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3502 /* Check if address is a home address configured on any interface. */
3503 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3504 {
3505 int ret = 0;
3506 struct inet6_ifaddr *ifp = NULL;
3507 unsigned int hash = inet6_addr_hash(addr);
3508
3509 rcu_read_lock_bh();
3510 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3511 if (!net_eq(dev_net(ifp->idev->dev), net))
3512 continue;
3513 if (ipv6_addr_equal(&ifp->addr, addr) &&
3514 (ifp->flags & IFA_F_HOMEADDRESS)) {
3515 ret = 1;
3516 break;
3517 }
3518 }
3519 rcu_read_unlock_bh();
3520 return ret;
3521 }
3522 #endif
3523
3524 /*
3525 * Periodic address status verification
3526 */
3527
3528 static void addrconf_verify(unsigned long foo)
3529 {
3530 unsigned long now, next, next_sec, next_sched;
3531 struct inet6_ifaddr *ifp;
3532 int i;
3533
3534 rcu_read_lock_bh();
3535 spin_lock(&addrconf_verify_lock);
3536 now = jiffies;
3537 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3538
3539 del_timer(&addr_chk_timer);
3540
3541 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3542 restart:
3543 hlist_for_each_entry_rcu_bh(ifp,
3544 &inet6_addr_lst[i], addr_lst) {
3545 unsigned long age;
3546
3547 if (ifp->flags & IFA_F_PERMANENT)
3548 continue;
3549
3550 spin_lock(&ifp->lock);
3551 /* We try to batch several events at once. */
3552 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3553
3554 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3555 age >= ifp->valid_lft) {
3556 spin_unlock(&ifp->lock);
3557 in6_ifa_hold(ifp);
3558 ipv6_del_addr(ifp);
3559 goto restart;
3560 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3561 spin_unlock(&ifp->lock);
3562 continue;
3563 } else if (age >= ifp->prefered_lft) {
3564 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3565 int deprecate = 0;
3566
3567 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3568 deprecate = 1;
3569 ifp->flags |= IFA_F_DEPRECATED;
3570 }
3571
3572 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3573 next = ifp->tstamp + ifp->valid_lft * HZ;
3574
3575 spin_unlock(&ifp->lock);
3576
3577 if (deprecate) {
3578 in6_ifa_hold(ifp);
3579
3580 ipv6_ifa_notify(0, ifp);
3581 in6_ifa_put(ifp);
3582 goto restart;
3583 }
3584 #ifdef CONFIG_IPV6_PRIVACY
3585 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3586 !(ifp->flags&IFA_F_TENTATIVE)) {
3587 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3588 ifp->idev->cnf.dad_transmits *
3589 ifp->idev->nd_parms->retrans_time / HZ;
3590
3591 if (age >= ifp->prefered_lft - regen_advance) {
3592 struct inet6_ifaddr *ifpub = ifp->ifpub;
3593 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3594 next = ifp->tstamp + ifp->prefered_lft * HZ;
3595 if (!ifp->regen_count && ifpub) {
3596 ifp->regen_count++;
3597 in6_ifa_hold(ifp);
3598 in6_ifa_hold(ifpub);
3599 spin_unlock(&ifp->lock);
3600
3601 spin_lock(&ifpub->lock);
3602 ifpub->regen_count = 0;
3603 spin_unlock(&ifpub->lock);
3604 ipv6_create_tempaddr(ifpub, ifp);
3605 in6_ifa_put(ifpub);
3606 in6_ifa_put(ifp);
3607 goto restart;
3608 }
3609 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3610 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3611 spin_unlock(&ifp->lock);
3612 #endif
3613 } else {
3614 /* ifp->prefered_lft <= ifp->valid_lft */
3615 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3616 next = ifp->tstamp + ifp->prefered_lft * HZ;
3617 spin_unlock(&ifp->lock);
3618 }
3619 }
3620 }
3621
3622 next_sec = round_jiffies_up(next);
3623 next_sched = next;
3624
3625 /* If rounded timeout is accurate enough, accept it. */
3626 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3627 next_sched = next_sec;
3628
3629 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3630 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3631 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3632
3633 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3634 now, next, next_sec, next_sched));
3635
3636 addr_chk_timer.expires = next_sched;
3637 add_timer(&addr_chk_timer);
3638 spin_unlock(&addrconf_verify_lock);
3639 rcu_read_unlock_bh();
3640 }
3641
3642 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3643 struct in6_addr **peer_pfx)
3644 {
3645 struct in6_addr *pfx = NULL;
3646
3647 *peer_pfx = NULL;
3648
3649 if (addr)
3650 pfx = nla_data(addr);
3651
3652 if (local) {
3653 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3654 *peer_pfx = pfx;
3655 pfx = nla_data(local);
3656 }
3657
3658 return pfx;
3659 }
3660
3661 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3662 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3663 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3664 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3665 };
3666
3667 static int
3668 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3669 {
3670 struct net *net = sock_net(skb->sk);
3671 struct ifaddrmsg *ifm;
3672 struct nlattr *tb[IFA_MAX+1];
3673 struct in6_addr *pfx, *peer_pfx;
3674 int err;
3675
3676 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3677 if (err < 0)
3678 return err;
3679
3680 ifm = nlmsg_data(nlh);
3681 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3682 if (pfx == NULL)
3683 return -EINVAL;
3684
3685 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3686 }
3687
3688 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3689 u32 prefered_lft, u32 valid_lft)
3690 {
3691 u32 flags;
3692 clock_t expires;
3693 unsigned long timeout;
3694
3695 if (!valid_lft || (prefered_lft > valid_lft))
3696 return -EINVAL;
3697
3698 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3699 if (addrconf_finite_timeout(timeout)) {
3700 expires = jiffies_to_clock_t(timeout * HZ);
3701 valid_lft = timeout;
3702 flags = RTF_EXPIRES;
3703 } else {
3704 expires = 0;
3705 flags = 0;
3706 ifa_flags |= IFA_F_PERMANENT;
3707 }
3708
3709 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3710 if (addrconf_finite_timeout(timeout)) {
3711 if (timeout == 0)
3712 ifa_flags |= IFA_F_DEPRECATED;
3713 prefered_lft = timeout;
3714 }
3715
3716 spin_lock_bh(&ifp->lock);
3717 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3718 ifp->tstamp = jiffies;
3719 ifp->valid_lft = valid_lft;
3720 ifp->prefered_lft = prefered_lft;
3721
3722 spin_unlock_bh(&ifp->lock);
3723 if (!(ifp->flags&IFA_F_TENTATIVE))
3724 ipv6_ifa_notify(0, ifp);
3725
3726 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3727 expires, flags);
3728 addrconf_verify(0);
3729
3730 return 0;
3731 }
3732
3733 static int
3734 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3735 {
3736 struct net *net = sock_net(skb->sk);
3737 struct ifaddrmsg *ifm;
3738 struct nlattr *tb[IFA_MAX+1];
3739 struct in6_addr *pfx, *peer_pfx;
3740 struct inet6_ifaddr *ifa;
3741 struct net_device *dev;
3742 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3743 u8 ifa_flags;
3744 int err;
3745
3746 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3747 if (err < 0)
3748 return err;
3749
3750 ifm = nlmsg_data(nlh);
3751 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
3752 if (pfx == NULL)
3753 return -EINVAL;
3754
3755 if (tb[IFA_CACHEINFO]) {
3756 struct ifa_cacheinfo *ci;
3757
3758 ci = nla_data(tb[IFA_CACHEINFO]);
3759 valid_lft = ci->ifa_valid;
3760 preferred_lft = ci->ifa_prefered;
3761 } else {
3762 preferred_lft = INFINITY_LIFE_TIME;
3763 valid_lft = INFINITY_LIFE_TIME;
3764 }
3765
3766 dev = __dev_get_by_index(net, ifm->ifa_index);
3767 if (dev == NULL)
3768 return -ENODEV;
3769
3770 /* We ignore other flags so far. */
3771 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3772
3773 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3774 if (ifa == NULL) {
3775 /*
3776 * It would be best to check for !NLM_F_CREATE here but
3777 * userspace alreay relies on not having to provide this.
3778 */
3779 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
3780 ifm->ifa_prefixlen, ifa_flags,
3781 preferred_lft, valid_lft);
3782 }
3783
3784 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3785 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3786 err = -EEXIST;
3787 else
3788 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3789
3790 in6_ifa_put(ifa);
3791
3792 return err;
3793 }
3794
3795 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3796 u8 scope, int ifindex)
3797 {
3798 struct ifaddrmsg *ifm;
3799
3800 ifm = nlmsg_data(nlh);
3801 ifm->ifa_family = AF_INET6;
3802 ifm->ifa_prefixlen = prefixlen;
3803 ifm->ifa_flags = flags;
3804 ifm->ifa_scope = scope;
3805 ifm->ifa_index = ifindex;
3806 }
3807
3808 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3809 unsigned long tstamp, u32 preferred, u32 valid)
3810 {
3811 struct ifa_cacheinfo ci;
3812
3813 ci.cstamp = cstamp_delta(cstamp);
3814 ci.tstamp = cstamp_delta(tstamp);
3815 ci.ifa_prefered = preferred;
3816 ci.ifa_valid = valid;
3817
3818 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3819 }
3820
3821 static inline int rt_scope(int ifa_scope)
3822 {
3823 if (ifa_scope & IFA_HOST)
3824 return RT_SCOPE_HOST;
3825 else if (ifa_scope & IFA_LINK)
3826 return RT_SCOPE_LINK;
3827 else if (ifa_scope & IFA_SITE)
3828 return RT_SCOPE_SITE;
3829 else
3830 return RT_SCOPE_UNIVERSE;
3831 }
3832
3833 static inline int inet6_ifaddr_msgsize(void)
3834 {
3835 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3836 + nla_total_size(16) /* IFA_LOCAL */
3837 + nla_total_size(16) /* IFA_ADDRESS */
3838 + nla_total_size(sizeof(struct ifa_cacheinfo));
3839 }
3840
3841 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3842 u32 portid, u32 seq, int event, unsigned int flags)
3843 {
3844 struct nlmsghdr *nlh;
3845 u32 preferred, valid;
3846
3847 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3848 if (nlh == NULL)
3849 return -EMSGSIZE;
3850
3851 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3852 ifa->idev->dev->ifindex);
3853
3854 if (!(ifa->flags&IFA_F_PERMANENT)) {
3855 preferred = ifa->prefered_lft;
3856 valid = ifa->valid_lft;
3857 if (preferred != INFINITY_LIFE_TIME) {
3858 long tval = (jiffies - ifa->tstamp)/HZ;
3859 if (preferred > tval)
3860 preferred -= tval;
3861 else
3862 preferred = 0;
3863 if (valid != INFINITY_LIFE_TIME) {
3864 if (valid > tval)
3865 valid -= tval;
3866 else
3867 valid = 0;
3868 }
3869 }
3870 } else {
3871 preferred = INFINITY_LIFE_TIME;
3872 valid = INFINITY_LIFE_TIME;
3873 }
3874
3875 if (!ipv6_addr_any(&ifa->peer_addr)) {
3876 if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
3877 nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
3878 goto error;
3879 } else
3880 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
3881 goto error;
3882
3883 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
3884 goto error;
3885
3886 return nlmsg_end(skb, nlh);
3887
3888 error:
3889 nlmsg_cancel(skb, nlh);
3890 return -EMSGSIZE;
3891 }
3892
3893 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3894 u32 portid, u32 seq, int event, u16 flags)
3895 {
3896 struct nlmsghdr *nlh;
3897 u8 scope = RT_SCOPE_UNIVERSE;
3898 int ifindex = ifmca->idev->dev->ifindex;
3899
3900 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3901 scope = RT_SCOPE_SITE;
3902
3903 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3904 if (nlh == NULL)
3905 return -EMSGSIZE;
3906
3907 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3908 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3909 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3910 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3911 nlmsg_cancel(skb, nlh);
3912 return -EMSGSIZE;
3913 }
3914
3915 return nlmsg_end(skb, nlh);
3916 }
3917
3918 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3919 u32 portid, u32 seq, int event, unsigned int flags)
3920 {
3921 struct nlmsghdr *nlh;
3922 u8 scope = RT_SCOPE_UNIVERSE;
3923 int ifindex = ifaca->aca_idev->dev->ifindex;
3924
3925 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3926 scope = RT_SCOPE_SITE;
3927
3928 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3929 if (nlh == NULL)
3930 return -EMSGSIZE;
3931
3932 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3933 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3934 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3935 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3936 nlmsg_cancel(skb, nlh);
3937 return -EMSGSIZE;
3938 }
3939
3940 return nlmsg_end(skb, nlh);
3941 }
3942
3943 enum addr_type_t {
3944 UNICAST_ADDR,
3945 MULTICAST_ADDR,
3946 ANYCAST_ADDR,
3947 };
3948
3949 /* called with rcu_read_lock() */
3950 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3951 struct netlink_callback *cb, enum addr_type_t type,
3952 int s_ip_idx, int *p_ip_idx)
3953 {
3954 struct ifmcaddr6 *ifmca;
3955 struct ifacaddr6 *ifaca;
3956 int err = 1;
3957 int ip_idx = *p_ip_idx;
3958
3959 read_lock_bh(&idev->lock);
3960 switch (type) {
3961 case UNICAST_ADDR: {
3962 struct inet6_ifaddr *ifa;
3963
3964 /* unicast address incl. temp addr */
3965 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3966 if (++ip_idx < s_ip_idx)
3967 continue;
3968 err = inet6_fill_ifaddr(skb, ifa,
3969 NETLINK_CB(cb->skb).portid,
3970 cb->nlh->nlmsg_seq,
3971 RTM_NEWADDR,
3972 NLM_F_MULTI);
3973 if (err <= 0)
3974 break;
3975 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
3976 }
3977 break;
3978 }
3979 case MULTICAST_ADDR:
3980 /* multicast address */
3981 for (ifmca = idev->mc_list; ifmca;
3982 ifmca = ifmca->next, ip_idx++) {
3983 if (ip_idx < s_ip_idx)
3984 continue;
3985 err = inet6_fill_ifmcaddr(skb, ifmca,
3986 NETLINK_CB(cb->skb).portid,
3987 cb->nlh->nlmsg_seq,
3988 RTM_GETMULTICAST,
3989 NLM_F_MULTI);
3990 if (err <= 0)
3991 break;
3992 }
3993 break;
3994 case ANYCAST_ADDR:
3995 /* anycast address */
3996 for (ifaca = idev->ac_list; ifaca;
3997 ifaca = ifaca->aca_next, ip_idx++) {
3998 if (ip_idx < s_ip_idx)
3999 continue;
4000 err = inet6_fill_ifacaddr(skb, ifaca,
4001 NETLINK_CB(cb->skb).portid,
4002 cb->nlh->nlmsg_seq,
4003 RTM_GETANYCAST,
4004 NLM_F_MULTI);
4005 if (err <= 0)
4006 break;
4007 }
4008 break;
4009 default:
4010 break;
4011 }
4012 read_unlock_bh(&idev->lock);
4013 *p_ip_idx = ip_idx;
4014 return err;
4015 }
4016
4017 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4018 enum addr_type_t type)
4019 {
4020 struct net *net = sock_net(skb->sk);
4021 int h, s_h;
4022 int idx, ip_idx;
4023 int s_idx, s_ip_idx;
4024 struct net_device *dev;
4025 struct inet6_dev *idev;
4026 struct hlist_head *head;
4027
4028 s_h = cb->args[0];
4029 s_idx = idx = cb->args[1];
4030 s_ip_idx = ip_idx = cb->args[2];
4031
4032 rcu_read_lock();
4033 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4034 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4035 idx = 0;
4036 head = &net->dev_index_head[h];
4037 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4038 if (idx < s_idx)
4039 goto cont;
4040 if (h > s_h || idx > s_idx)
4041 s_ip_idx = 0;
4042 ip_idx = 0;
4043 idev = __in6_dev_get(dev);
4044 if (!idev)
4045 goto cont;
4046
4047 if (in6_dump_addrs(idev, skb, cb, type,
4048 s_ip_idx, &ip_idx) <= 0)
4049 goto done;
4050 cont:
4051 idx++;
4052 }
4053 }
4054 done:
4055 rcu_read_unlock();
4056 cb->args[0] = h;
4057 cb->args[1] = idx;
4058 cb->args[2] = ip_idx;
4059
4060 return skb->len;
4061 }
4062
4063 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4064 {
4065 enum addr_type_t type = UNICAST_ADDR;
4066
4067 return inet6_dump_addr(skb, cb, type);
4068 }
4069
4070 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4071 {
4072 enum addr_type_t type = MULTICAST_ADDR;
4073
4074 return inet6_dump_addr(skb, cb, type);
4075 }
4076
4077
4078 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4079 {
4080 enum addr_type_t type = ANYCAST_ADDR;
4081
4082 return inet6_dump_addr(skb, cb, type);
4083 }
4084
4085 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4086 {
4087 struct net *net = sock_net(in_skb->sk);
4088 struct ifaddrmsg *ifm;
4089 struct nlattr *tb[IFA_MAX+1];
4090 struct in6_addr *addr = NULL, *peer;
4091 struct net_device *dev = NULL;
4092 struct inet6_ifaddr *ifa;
4093 struct sk_buff *skb;
4094 int err;
4095
4096 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4097 if (err < 0)
4098 goto errout;
4099
4100 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4101 if (addr == NULL) {
4102 err = -EINVAL;
4103 goto errout;
4104 }
4105
4106 ifm = nlmsg_data(nlh);
4107 if (ifm->ifa_index)
4108 dev = __dev_get_by_index(net, ifm->ifa_index);
4109
4110 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4111 if (!ifa) {
4112 err = -EADDRNOTAVAIL;
4113 goto errout;
4114 }
4115
4116 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4117 if (!skb) {
4118 err = -ENOBUFS;
4119 goto errout_ifa;
4120 }
4121
4122 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4123 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4124 if (err < 0) {
4125 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4126 WARN_ON(err == -EMSGSIZE);
4127 kfree_skb(skb);
4128 goto errout_ifa;
4129 }
4130 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4131 errout_ifa:
4132 in6_ifa_put(ifa);
4133 errout:
4134 return err;
4135 }
4136
4137 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4138 {
4139 struct sk_buff *skb;
4140 struct net *net = dev_net(ifa->idev->dev);
4141 int err = -ENOBUFS;
4142
4143 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4144 if (skb == NULL)
4145 goto errout;
4146
4147 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4148 if (err < 0) {
4149 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4150 WARN_ON(err == -EMSGSIZE);
4151 kfree_skb(skb);
4152 goto errout;
4153 }
4154 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4155 return;
4156 errout:
4157 if (err < 0)
4158 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4159 }
4160
4161 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4162 __s32 *array, int bytes)
4163 {
4164 BUG_ON(bytes < (DEVCONF_MAX * 4));
4165
4166 memset(array, 0, bytes);
4167 array[DEVCONF_FORWARDING] = cnf->forwarding;
4168 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4169 array[DEVCONF_MTU6] = cnf->mtu6;
4170 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4171 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4172 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4173 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4174 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4175 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4176 jiffies_to_msecs(cnf->rtr_solicit_interval);
4177 array[DEVCONF_RTR_SOLICIT_DELAY] =
4178 jiffies_to_msecs(cnf->rtr_solicit_delay);
4179 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4180 #ifdef CONFIG_IPV6_PRIVACY
4181 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4182 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4183 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4184 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4185 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4186 #endif
4187 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4188 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4189 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4190 #ifdef CONFIG_IPV6_ROUTER_PREF
4191 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4192 array[DEVCONF_RTR_PROBE_INTERVAL] =
4193 jiffies_to_msecs(cnf->rtr_probe_interval);
4194 #ifdef CONFIG_IPV6_ROUTE_INFO
4195 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4196 #endif
4197 #endif
4198 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4199 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4200 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4201 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4202 #endif
4203 #ifdef CONFIG_IPV6_MROUTE
4204 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4205 #endif
4206 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4207 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4208 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4209 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4210 }
4211
4212 static inline size_t inet6_ifla6_size(void)
4213 {
4214 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4215 + nla_total_size(sizeof(struct ifla_cacheinfo))
4216 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4217 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4218 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4219 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4220 }
4221
4222 static inline size_t inet6_if_nlmsg_size(void)
4223 {
4224 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4225 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4226 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4227 + nla_total_size(4) /* IFLA_MTU */
4228 + nla_total_size(4) /* IFLA_LINK */
4229 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4230 }
4231
4232 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4233 int items, int bytes)
4234 {
4235 int i;
4236 int pad = bytes - sizeof(u64) * items;
4237 BUG_ON(pad < 0);
4238
4239 /* Use put_unaligned() because stats may not be aligned for u64. */
4240 put_unaligned(items, &stats[0]);
4241 for (i = 1; i < items; i++)
4242 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4243
4244 memset(&stats[items], 0, pad);
4245 }
4246
4247 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4248 int items, int bytes, size_t syncpoff)
4249 {
4250 int i;
4251 int pad = bytes - sizeof(u64) * items;
4252 BUG_ON(pad < 0);
4253
4254 /* Use put_unaligned() because stats may not be aligned for u64. */
4255 put_unaligned(items, &stats[0]);
4256 for (i = 1; i < items; i++)
4257 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4258
4259 memset(&stats[items], 0, pad);
4260 }
4261
4262 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4263 int bytes)
4264 {
4265 switch (attrtype) {
4266 case IFLA_INET6_STATS:
4267 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4268 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4269 break;
4270 case IFLA_INET6_ICMP6STATS:
4271 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4272 break;
4273 }
4274 }
4275
4276 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4277 {
4278 struct nlattr *nla;
4279 struct ifla_cacheinfo ci;
4280
4281 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4282 goto nla_put_failure;
4283 ci.max_reasm_len = IPV6_MAXPLEN;
4284 ci.tstamp = cstamp_delta(idev->tstamp);
4285 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4286 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4287 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4288 goto nla_put_failure;
4289 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4290 if (nla == NULL)
4291 goto nla_put_failure;
4292 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4293
4294 /* XXX - MC not implemented */
4295
4296 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4297 if (nla == NULL)
4298 goto nla_put_failure;
4299 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4300
4301 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4302 if (nla == NULL)
4303 goto nla_put_failure;
4304 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4305
4306 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4307 if (nla == NULL)
4308 goto nla_put_failure;
4309 read_lock_bh(&idev->lock);
4310 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4311 read_unlock_bh(&idev->lock);
4312
4313 return 0;
4314
4315 nla_put_failure:
4316 return -EMSGSIZE;
4317 }
4318
4319 static size_t inet6_get_link_af_size(const struct net_device *dev)
4320 {
4321 if (!__in6_dev_get(dev))
4322 return 0;
4323
4324 return inet6_ifla6_size();
4325 }
4326
4327 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4328 {
4329 struct inet6_dev *idev = __in6_dev_get(dev);
4330
4331 if (!idev)
4332 return -ENODATA;
4333
4334 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4335 return -EMSGSIZE;
4336
4337 return 0;
4338 }
4339
4340 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4341 {
4342 struct inet6_ifaddr *ifp;
4343 struct net_device *dev = idev->dev;
4344 bool update_rs = false;
4345 struct in6_addr ll_addr;
4346
4347 if (token == NULL)
4348 return -EINVAL;
4349 if (ipv6_addr_any(token))
4350 return -EINVAL;
4351 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4352 return -EINVAL;
4353 if (!ipv6_accept_ra(idev))
4354 return -EINVAL;
4355 if (idev->cnf.rtr_solicits <= 0)
4356 return -EINVAL;
4357
4358 write_lock_bh(&idev->lock);
4359
4360 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4361 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4362
4363 write_unlock_bh(&idev->lock);
4364
4365 if (!idev->dead && (idev->if_flags & IF_READY) &&
4366 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4367 IFA_F_OPTIMISTIC)) {
4368
4369 /* If we're not ready, then normal ifup will take care
4370 * of this. Otherwise, we need to request our rs here.
4371 */
4372 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4373 update_rs = true;
4374 }
4375
4376 write_lock_bh(&idev->lock);
4377
4378 if (update_rs) {
4379 idev->if_flags |= IF_RS_SENT;
4380 idev->rs_probes = 1;
4381 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4382 }
4383
4384 /* Well, that's kinda nasty ... */
4385 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4386 spin_lock(&ifp->lock);
4387 if (ifp->tokenized) {
4388 ifp->valid_lft = 0;
4389 ifp->prefered_lft = 0;
4390 }
4391 spin_unlock(&ifp->lock);
4392 }
4393
4394 write_unlock_bh(&idev->lock);
4395 addrconf_verify(0);
4396 return 0;
4397 }
4398
4399 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4400 {
4401 int err = -EINVAL;
4402 struct inet6_dev *idev = __in6_dev_get(dev);
4403 struct nlattr *tb[IFLA_INET6_MAX + 1];
4404
4405 if (!idev)
4406 return -EAFNOSUPPORT;
4407
4408 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4409 BUG();
4410
4411 if (tb[IFLA_INET6_TOKEN])
4412 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4413
4414 return err;
4415 }
4416
4417 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4418 u32 portid, u32 seq, int event, unsigned int flags)
4419 {
4420 struct net_device *dev = idev->dev;
4421 struct ifinfomsg *hdr;
4422 struct nlmsghdr *nlh;
4423 void *protoinfo;
4424
4425 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4426 if (nlh == NULL)
4427 return -EMSGSIZE;
4428
4429 hdr = nlmsg_data(nlh);
4430 hdr->ifi_family = AF_INET6;
4431 hdr->__ifi_pad = 0;
4432 hdr->ifi_type = dev->type;
4433 hdr->ifi_index = dev->ifindex;
4434 hdr->ifi_flags = dev_get_flags(dev);
4435 hdr->ifi_change = 0;
4436
4437 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4438 (dev->addr_len &&
4439 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4440 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4441 (dev->ifindex != dev->iflink &&
4442 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4443 goto nla_put_failure;
4444 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4445 if (protoinfo == NULL)
4446 goto nla_put_failure;
4447
4448 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4449 goto nla_put_failure;
4450
4451 nla_nest_end(skb, protoinfo);
4452 return nlmsg_end(skb, nlh);
4453
4454 nla_put_failure:
4455 nlmsg_cancel(skb, nlh);
4456 return -EMSGSIZE;
4457 }
4458
4459 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4460 {
4461 struct net *net = sock_net(skb->sk);
4462 int h, s_h;
4463 int idx = 0, s_idx;
4464 struct net_device *dev;
4465 struct inet6_dev *idev;
4466 struct hlist_head *head;
4467
4468 s_h = cb->args[0];
4469 s_idx = cb->args[1];
4470
4471 rcu_read_lock();
4472 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4473 idx = 0;
4474 head = &net->dev_index_head[h];
4475 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4476 if (idx < s_idx)
4477 goto cont;
4478 idev = __in6_dev_get(dev);
4479 if (!idev)
4480 goto cont;
4481 if (inet6_fill_ifinfo(skb, idev,
4482 NETLINK_CB(cb->skb).portid,
4483 cb->nlh->nlmsg_seq,
4484 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4485 goto out;
4486 cont:
4487 idx++;
4488 }
4489 }
4490 out:
4491 rcu_read_unlock();
4492 cb->args[1] = idx;
4493 cb->args[0] = h;
4494
4495 return skb->len;
4496 }
4497
4498 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4499 {
4500 struct sk_buff *skb;
4501 struct net *net = dev_net(idev->dev);
4502 int err = -ENOBUFS;
4503
4504 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4505 if (skb == NULL)
4506 goto errout;
4507
4508 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4509 if (err < 0) {
4510 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4511 WARN_ON(err == -EMSGSIZE);
4512 kfree_skb(skb);
4513 goto errout;
4514 }
4515 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4516 return;
4517 errout:
4518 if (err < 0)
4519 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4520 }
4521
4522 static inline size_t inet6_prefix_nlmsg_size(void)
4523 {
4524 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4525 + nla_total_size(sizeof(struct in6_addr))
4526 + nla_total_size(sizeof(struct prefix_cacheinfo));
4527 }
4528
4529 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4530 struct prefix_info *pinfo, u32 portid, u32 seq,
4531 int event, unsigned int flags)
4532 {
4533 struct prefixmsg *pmsg;
4534 struct nlmsghdr *nlh;
4535 struct prefix_cacheinfo ci;
4536
4537 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4538 if (nlh == NULL)
4539 return -EMSGSIZE;
4540
4541 pmsg = nlmsg_data(nlh);
4542 pmsg->prefix_family = AF_INET6;
4543 pmsg->prefix_pad1 = 0;
4544 pmsg->prefix_pad2 = 0;
4545 pmsg->prefix_ifindex = idev->dev->ifindex;
4546 pmsg->prefix_len = pinfo->prefix_len;
4547 pmsg->prefix_type = pinfo->type;
4548 pmsg->prefix_pad3 = 0;
4549 pmsg->prefix_flags = 0;
4550 if (pinfo->onlink)
4551 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4552 if (pinfo->autoconf)
4553 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4554
4555 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4556 goto nla_put_failure;
4557 ci.preferred_time = ntohl(pinfo->prefered);
4558 ci.valid_time = ntohl(pinfo->valid);
4559 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4560 goto nla_put_failure;
4561 return nlmsg_end(skb, nlh);
4562
4563 nla_put_failure:
4564 nlmsg_cancel(skb, nlh);
4565 return -EMSGSIZE;
4566 }
4567
4568 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4569 struct prefix_info *pinfo)
4570 {
4571 struct sk_buff *skb;
4572 struct net *net = dev_net(idev->dev);
4573 int err = -ENOBUFS;
4574
4575 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4576 if (skb == NULL)
4577 goto errout;
4578
4579 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4580 if (err < 0) {
4581 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4582 WARN_ON(err == -EMSGSIZE);
4583 kfree_skb(skb);
4584 goto errout;
4585 }
4586 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4587 return;
4588 errout:
4589 if (err < 0)
4590 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4591 }
4592
4593 static void update_valid_ll_addr_cnt(struct inet6_ifaddr *ifp, int count)
4594 {
4595 write_lock_bh(&ifp->idev->lock);
4596 spin_lock(&ifp->lock);
4597 if (((ifp->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|
4598 IFA_F_DADFAILED)) == IFA_F_PERMANENT) &&
4599 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL))
4600 ifp->idev->valid_ll_addr_cnt += count;
4601 WARN_ON(ifp->idev->valid_ll_addr_cnt < 0);
4602 spin_unlock(&ifp->lock);
4603 write_unlock_bh(&ifp->idev->lock);
4604 }
4605
4606 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4607 {
4608 struct net *net = dev_net(ifp->idev->dev);
4609
4610 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4611
4612 switch (event) {
4613 case RTM_NEWADDR:
4614 update_valid_ll_addr_cnt(ifp, 1);
4615
4616 /*
4617 * If the address was optimistic
4618 * we inserted the route at the start of
4619 * our DAD process, so we don't need
4620 * to do it again
4621 */
4622 if (!(ifp->rt->rt6i_node))
4623 ip6_ins_rt(ifp->rt);
4624 if (ifp->idev->cnf.forwarding)
4625 addrconf_join_anycast(ifp);
4626 if (!ipv6_addr_any(&ifp->peer_addr))
4627 addrconf_prefix_route(&ifp->peer_addr, 128,
4628 ifp->idev->dev, 0, 0);
4629 break;
4630 case RTM_DELADDR:
4631 update_valid_ll_addr_cnt(ifp, -1);
4632
4633 if (ifp->idev->cnf.forwarding)
4634 addrconf_leave_anycast(ifp);
4635 addrconf_leave_solict(ifp->idev, &ifp->addr);
4636 if (!ipv6_addr_any(&ifp->peer_addr)) {
4637 struct rt6_info *rt;
4638 struct net_device *dev = ifp->idev->dev;
4639
4640 rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
4641 dev->ifindex, 1);
4642 if (rt) {
4643 dst_hold(&rt->dst);
4644 if (ip6_del_rt(rt))
4645 dst_free(&rt->dst);
4646 }
4647 }
4648 dst_hold(&ifp->rt->dst);
4649
4650 if (ip6_del_rt(ifp->rt))
4651 dst_free(&ifp->rt->dst);
4652 break;
4653 }
4654 atomic_inc(&net->ipv6.dev_addr_genid);
4655 }
4656
4657 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4658 {
4659 rcu_read_lock_bh();
4660 if (likely(ifp->idev->dead == 0))
4661 __ipv6_ifa_notify(event, ifp);
4662 rcu_read_unlock_bh();
4663 }
4664
4665 #ifdef CONFIG_SYSCTL
4666
4667 static
4668 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
4669 void __user *buffer, size_t *lenp, loff_t *ppos)
4670 {
4671 int *valp = ctl->data;
4672 int val = *valp;
4673 loff_t pos = *ppos;
4674 struct ctl_table lctl;
4675 int ret;
4676
4677 /*
4678 * ctl->data points to idev->cnf.forwarding, we should
4679 * not modify it until we get the rtnl lock.
4680 */
4681 lctl = *ctl;
4682 lctl.data = &val;
4683
4684 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4685
4686 if (write)
4687 ret = addrconf_fixup_forwarding(ctl, valp, val);
4688 if (ret)
4689 *ppos = pos;
4690 return ret;
4691 }
4692
4693 static void dev_disable_change(struct inet6_dev *idev)
4694 {
4695 struct netdev_notifier_info info;
4696
4697 if (!idev || !idev->dev)
4698 return;
4699
4700 netdev_notifier_info_init(&info, idev->dev);
4701 if (idev->cnf.disable_ipv6)
4702 addrconf_notify(NULL, NETDEV_DOWN, &info);
4703 else
4704 addrconf_notify(NULL, NETDEV_UP, &info);
4705 }
4706
4707 static void addrconf_disable_change(struct net *net, __s32 newf)
4708 {
4709 struct net_device *dev;
4710 struct inet6_dev *idev;
4711
4712 rcu_read_lock();
4713 for_each_netdev_rcu(net, dev) {
4714 idev = __in6_dev_get(dev);
4715 if (idev) {
4716 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4717 idev->cnf.disable_ipv6 = newf;
4718 if (changed)
4719 dev_disable_change(idev);
4720 }
4721 }
4722 rcu_read_unlock();
4723 }
4724
4725 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4726 {
4727 struct net *net;
4728 int old;
4729
4730 if (!rtnl_trylock())
4731 return restart_syscall();
4732
4733 net = (struct net *)table->extra2;
4734 old = *p;
4735 *p = newf;
4736
4737 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4738 rtnl_unlock();
4739 return 0;
4740 }
4741
4742 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4743 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4744 addrconf_disable_change(net, newf);
4745 } else if ((!newf) ^ (!old))
4746 dev_disable_change((struct inet6_dev *)table->extra1);
4747
4748 rtnl_unlock();
4749 return 0;
4750 }
4751
4752 static
4753 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
4754 void __user *buffer, size_t *lenp, loff_t *ppos)
4755 {
4756 int *valp = ctl->data;
4757 int val = *valp;
4758 loff_t pos = *ppos;
4759 struct ctl_table lctl;
4760 int ret;
4761
4762 /*
4763 * ctl->data points to idev->cnf.disable_ipv6, we should
4764 * not modify it until we get the rtnl lock.
4765 */
4766 lctl = *ctl;
4767 lctl.data = &val;
4768
4769 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4770
4771 if (write)
4772 ret = addrconf_disable_ipv6(ctl, valp, val);
4773 if (ret)
4774 *ppos = pos;
4775 return ret;
4776 }
4777
4778 static struct addrconf_sysctl_table
4779 {
4780 struct ctl_table_header *sysctl_header;
4781 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
4782 } addrconf_sysctl __read_mostly = {
4783 .sysctl_header = NULL,
4784 .addrconf_vars = {
4785 {
4786 .procname = "forwarding",
4787 .data = &ipv6_devconf.forwarding,
4788 .maxlen = sizeof(int),
4789 .mode = 0644,
4790 .proc_handler = addrconf_sysctl_forward,
4791 },
4792 {
4793 .procname = "hop_limit",
4794 .data = &ipv6_devconf.hop_limit,
4795 .maxlen = sizeof(int),
4796 .mode = 0644,
4797 .proc_handler = proc_dointvec,
4798 },
4799 {
4800 .procname = "mtu",
4801 .data = &ipv6_devconf.mtu6,
4802 .maxlen = sizeof(int),
4803 .mode = 0644,
4804 .proc_handler = proc_dointvec,
4805 },
4806 {
4807 .procname = "accept_ra",
4808 .data = &ipv6_devconf.accept_ra,
4809 .maxlen = sizeof(int),
4810 .mode = 0644,
4811 .proc_handler = proc_dointvec,
4812 },
4813 {
4814 .procname = "accept_redirects",
4815 .data = &ipv6_devconf.accept_redirects,
4816 .maxlen = sizeof(int),
4817 .mode = 0644,
4818 .proc_handler = proc_dointvec,
4819 },
4820 {
4821 .procname = "autoconf",
4822 .data = &ipv6_devconf.autoconf,
4823 .maxlen = sizeof(int),
4824 .mode = 0644,
4825 .proc_handler = proc_dointvec,
4826 },
4827 {
4828 .procname = "dad_transmits",
4829 .data = &ipv6_devconf.dad_transmits,
4830 .maxlen = sizeof(int),
4831 .mode = 0644,
4832 .proc_handler = proc_dointvec,
4833 },
4834 {
4835 .procname = "router_solicitations",
4836 .data = &ipv6_devconf.rtr_solicits,
4837 .maxlen = sizeof(int),
4838 .mode = 0644,
4839 .proc_handler = proc_dointvec,
4840 },
4841 {
4842 .procname = "router_solicitation_interval",
4843 .data = &ipv6_devconf.rtr_solicit_interval,
4844 .maxlen = sizeof(int),
4845 .mode = 0644,
4846 .proc_handler = proc_dointvec_jiffies,
4847 },
4848 {
4849 .procname = "router_solicitation_delay",
4850 .data = &ipv6_devconf.rtr_solicit_delay,
4851 .maxlen = sizeof(int),
4852 .mode = 0644,
4853 .proc_handler = proc_dointvec_jiffies,
4854 },
4855 {
4856 .procname = "force_mld_version",
4857 .data = &ipv6_devconf.force_mld_version,
4858 .maxlen = sizeof(int),
4859 .mode = 0644,
4860 .proc_handler = proc_dointvec,
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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