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Linux 3.9-rc4
[linux-2.6/cjktty.git] / net / ipv6 / addrconf.c
blobf2c7e615f902d861d99529536ecebff35fbd7fd5
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/ipv6.h>
74 #include <net/protocol.h>
75 #include <net/ndisc.h>
76 #include <net/ip6_route.h>
77 #include <net/addrconf.h>
78 #include <net/tcp.h>
79 #include <net/ip.h>
80 #include <net/netlink.h>
81 #include <net/pkt_sched.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
85
86 #ifdef CONFIG_IPV6_PRIVACY
87 #include <linux/random.h>
88 #endif
89
90 #include <linux/uaccess.h>
91 #include <asm/unaligned.h>
92
93 #include <linux/proc_fs.h>
94 #include <linux/seq_file.h>
95 #include <linux/export.h>
96
97 /* Set to 3 to get tracing... */
98 #define ACONF_DEBUG 2
99
100 #if ACONF_DEBUG >= 3
101 #define ADBG(x) printk x
102 #else
103 #define ADBG(x)
104 #endif
105
106 #define INFINITY_LIFE_TIME 0xFFFFFFFF
107
108 static inline u32 cstamp_delta(unsigned long cstamp)
109 {
110 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
111 }
112
113 #ifdef CONFIG_SYSCTL
114 static void addrconf_sysctl_register(struct inet6_dev *idev);
115 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
116 #else
117 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
118 {
119 }
120
121 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
122 {
123 }
124 #endif
125
126 #ifdef CONFIG_IPV6_PRIVACY
127 static void __ipv6_regen_rndid(struct inet6_dev *idev);
128 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
129 static void ipv6_regen_rndid(unsigned long data);
130 #endif
131
132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
133 static int ipv6_count_addresses(struct inet6_dev *idev);
134
135 /*
136 * Configured unicast address hash table
137 */
138 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
139 static DEFINE_SPINLOCK(addrconf_hash_lock);
140
141 static void addrconf_verify(unsigned long);
142
143 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
144 static DEFINE_SPINLOCK(addrconf_verify_lock);
145
146 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
147 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
148
149 static void addrconf_type_change(struct net_device *dev,
150 unsigned long event);
151 static int addrconf_ifdown(struct net_device *dev, int how);
152
153 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
154 int plen,
155 const struct net_device *dev,
156 u32 flags, u32 noflags);
157
158 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
159 static void addrconf_dad_timer(unsigned long data);
160 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
161 static void addrconf_dad_run(struct inet6_dev *idev);
162 static void addrconf_rs_timer(unsigned long data);
163 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
164 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165
166 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
167 struct prefix_info *pinfo);
168 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
169 struct net_device *dev);
170
171 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
172
173 static struct ipv6_devconf ipv6_devconf __read_mostly = {
174 .forwarding = 0,
175 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
176 .mtu6 = IPV6_MIN_MTU,
177 .accept_ra = 1,
178 .accept_redirects = 1,
179 .autoconf = 1,
180 .force_mld_version = 0,
181 .dad_transmits = 1,
182 .rtr_solicits = MAX_RTR_SOLICITATIONS,
183 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
184 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
185 #ifdef CONFIG_IPV6_PRIVACY
186 .use_tempaddr = 0,
187 .temp_valid_lft = TEMP_VALID_LIFETIME,
188 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
189 .regen_max_retry = REGEN_MAX_RETRY,
190 .max_desync_factor = MAX_DESYNC_FACTOR,
191 #endif
192 .max_addresses = IPV6_MAX_ADDRESSES,
193 .accept_ra_defrtr = 1,
194 .accept_ra_pinfo = 1,
195 #ifdef CONFIG_IPV6_ROUTER_PREF
196 .accept_ra_rtr_pref = 1,
197 .rtr_probe_interval = 60 * HZ,
198 #ifdef CONFIG_IPV6_ROUTE_INFO
199 .accept_ra_rt_info_max_plen = 0,
200 #endif
201 #endif
202 .proxy_ndp = 0,
203 .accept_source_route = 0, /* we do not accept RH0 by default. */
204 .disable_ipv6 = 0,
205 .accept_dad = 1,
206 };
207
208 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
209 .forwarding = 0,
210 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
211 .mtu6 = IPV6_MIN_MTU,
212 .accept_ra = 1,
213 .accept_redirects = 1,
214 .autoconf = 1,
215 .dad_transmits = 1,
216 .rtr_solicits = MAX_RTR_SOLICITATIONS,
217 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
218 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
219 #ifdef CONFIG_IPV6_PRIVACY
220 .use_tempaddr = 0,
221 .temp_valid_lft = TEMP_VALID_LIFETIME,
222 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
223 .regen_max_retry = REGEN_MAX_RETRY,
224 .max_desync_factor = MAX_DESYNC_FACTOR,
225 #endif
226 .max_addresses = IPV6_MAX_ADDRESSES,
227 .accept_ra_defrtr = 1,
228 .accept_ra_pinfo = 1,
229 #ifdef CONFIG_IPV6_ROUTER_PREF
230 .accept_ra_rtr_pref = 1,
231 .rtr_probe_interval = 60 * HZ,
232 #ifdef CONFIG_IPV6_ROUTE_INFO
233 .accept_ra_rt_info_max_plen = 0,
234 #endif
235 #endif
236 .proxy_ndp = 0,
237 .accept_source_route = 0, /* we do not accept RH0 by default. */
238 .disable_ipv6 = 0,
239 .accept_dad = 1,
240 };
241
242 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
243 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
244 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
245 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
246 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
247 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
248 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
249 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
250
251 /* Check if a valid qdisc is available */
252 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
253 {
254 return !qdisc_tx_is_noop(dev);
255 }
256
257 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
258 {
259 if (del_timer(&ifp->timer))
260 __in6_ifa_put(ifp);
261 }
262
263 enum addrconf_timer_t {
264 AC_NONE,
265 AC_DAD,
266 AC_RS,
267 };
268
269 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
270 enum addrconf_timer_t what,
271 unsigned long when)
272 {
273 if (!del_timer(&ifp->timer))
274 in6_ifa_hold(ifp);
275
276 switch (what) {
277 case AC_DAD:
278 ifp->timer.function = addrconf_dad_timer;
279 break;
280 case AC_RS:
281 ifp->timer.function = addrconf_rs_timer;
282 break;
283 default:
284 break;
285 }
286 ifp->timer.expires = jiffies + when;
287 add_timer(&ifp->timer);
288 }
289
290 static int snmp6_alloc_dev(struct inet6_dev *idev)
291 {
292 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
293 sizeof(struct ipstats_mib),
294 __alignof__(struct ipstats_mib)) < 0)
295 goto err_ip;
296 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6dev)
299 goto err_icmp;
300 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
301 GFP_KERNEL);
302 if (!idev->stats.icmpv6msgdev)
303 goto err_icmpmsg;
304
305 return 0;
306
307 err_icmpmsg:
308 kfree(idev->stats.icmpv6dev);
309 err_icmp:
310 snmp_mib_free((void __percpu **)idev->stats.ipv6);
311 err_ip:
312 return -ENOMEM;
313 }
314
315 static void snmp6_free_dev(struct inet6_dev *idev)
316 {
317 kfree(idev->stats.icmpv6msgdev);
318 kfree(idev->stats.icmpv6dev);
319 snmp_mib_free((void __percpu **)idev->stats.ipv6);
320 }
321
322 /* Nobody refers to this device, we may destroy it. */
323
324 void in6_dev_finish_destroy(struct inet6_dev *idev)
325 {
326 struct net_device *dev = idev->dev;
327
328 WARN_ON(!list_empty(&idev->addr_list));
329 WARN_ON(idev->mc_list != NULL);
330
331 #ifdef NET_REFCNT_DEBUG
332 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
333 #endif
334 dev_put(dev);
335 if (!idev->dead) {
336 pr_warn("Freeing alive inet6 device %p\n", idev);
337 return;
338 }
339 snmp6_free_dev(idev);
340 kfree_rcu(idev, rcu);
341 }
342 EXPORT_SYMBOL(in6_dev_finish_destroy);
343
344 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
345 {
346 struct inet6_dev *ndev;
347
348 ASSERT_RTNL();
349
350 if (dev->mtu < IPV6_MIN_MTU)
351 return NULL;
352
353 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
354
355 if (ndev == NULL)
356 return NULL;
357
358 rwlock_init(&ndev->lock);
359 ndev->dev = dev;
360 INIT_LIST_HEAD(&ndev->addr_list);
361
362 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
363 ndev->cnf.mtu6 = dev->mtu;
364 ndev->cnf.sysctl = NULL;
365 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
366 if (ndev->nd_parms == NULL) {
367 kfree(ndev);
368 return NULL;
369 }
370 if (ndev->cnf.forwarding)
371 dev_disable_lro(dev);
372 /* We refer to the device */
373 dev_hold(dev);
374
375 if (snmp6_alloc_dev(ndev) < 0) {
376 ADBG((KERN_WARNING
377 "%s: cannot allocate memory for statistics; dev=%s.\n",
378 __func__, dev->name));
379 neigh_parms_release(&nd_tbl, ndev->nd_parms);
380 dev_put(dev);
381 kfree(ndev);
382 return NULL;
383 }
384
385 if (snmp6_register_dev(ndev) < 0) {
386 ADBG((KERN_WARNING
387 "%s: cannot create /proc/net/dev_snmp6/%s\n",
388 __func__, dev->name));
389 neigh_parms_release(&nd_tbl, ndev->nd_parms);
390 ndev->dead = 1;
391 in6_dev_finish_destroy(ndev);
392 return NULL;
393 }
394
395 /* One reference from device. We must do this before
396 * we invoke __ipv6_regen_rndid().
397 */
398 in6_dev_hold(ndev);
399
400 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
401 ndev->cnf.accept_dad = -1;
402
403 #if IS_ENABLED(CONFIG_IPV6_SIT)
404 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
405 pr_info("%s: Disabled Multicast RS\n", dev->name);
406 ndev->cnf.rtr_solicits = 0;
407 }
408 #endif
409
410 #ifdef CONFIG_IPV6_PRIVACY
411 INIT_LIST_HEAD(&ndev->tempaddr_list);
412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
415 dev->type == ARPHRD_TUNNEL6 ||
416 dev->type == ARPHRD_SIT ||
417 dev->type == ARPHRD_NONE) {
418 ndev->cnf.use_tempaddr = -1;
419 } else {
420 in6_dev_hold(ndev);
421 ipv6_regen_rndid((unsigned long) ndev);
422 }
423 #endif
424
425 if (netif_running(dev) && addrconf_qdisc_ok(dev))
426 ndev->if_flags |= IF_READY;
427
428 ipv6_mc_init_dev(ndev);
429 ndev->tstamp = jiffies;
430 addrconf_sysctl_register(ndev);
431 /* protected by rtnl_lock */
432 rcu_assign_pointer(dev->ip6_ptr, ndev);
433
434 /* Join interface-local all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
436
437 /* Join all-node multicast group */
438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
439
440 /* Join all-router multicast group if forwarding is set */
441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
443
444 return ndev;
445 }
446
447 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
448 {
449 struct inet6_dev *idev;
450
451 ASSERT_RTNL();
452
453 idev = __in6_dev_get(dev);
454 if (!idev) {
455 idev = ipv6_add_dev(dev);
456 if (!idev)
457 return NULL;
458 }
459
460 if (dev->flags&IFF_UP)
461 ipv6_mc_up(idev);
462 return idev;
463 }
464
465 static int inet6_netconf_msgsize_devconf(int type)
466 {
467 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
468 + nla_total_size(4); /* NETCONFA_IFINDEX */
469
470 /* type -1 is used for ALL */
471 if (type == -1 || type == NETCONFA_FORWARDING)
472 size += nla_total_size(4);
473 #ifdef CONFIG_IPV6_MROUTE
474 if (type == -1 || type == NETCONFA_MC_FORWARDING)
475 size += nla_total_size(4);
476 #endif
477
478 return size;
479 }
480
481 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
482 struct ipv6_devconf *devconf, u32 portid,
483 u32 seq, int event, unsigned int flags,
484 int type)
485 {
486 struct nlmsghdr *nlh;
487 struct netconfmsg *ncm;
488
489 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
490 flags);
491 if (nlh == NULL)
492 return -EMSGSIZE;
493
494 ncm = nlmsg_data(nlh);
495 ncm->ncm_family = AF_INET6;
496
497 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
498 goto nla_put_failure;
499
500 /* type -1 is used for ALL */
501 if ((type == -1 || type == NETCONFA_FORWARDING) &&
502 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
503 goto nla_put_failure;
504 #ifdef CONFIG_IPV6_MROUTE
505 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
506 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
507 devconf->mc_forwarding) < 0)
508 goto nla_put_failure;
509 #endif
510 return nlmsg_end(skb, nlh);
511
512 nla_put_failure:
513 nlmsg_cancel(skb, nlh);
514 return -EMSGSIZE;
515 }
516
517 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
518 struct ipv6_devconf *devconf)
519 {
520 struct sk_buff *skb;
521 int err = -ENOBUFS;
522
523 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
524 if (skb == NULL)
525 goto errout;
526
527 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
528 RTM_NEWNETCONF, 0, type);
529 if (err < 0) {
530 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
531 WARN_ON(err == -EMSGSIZE);
532 kfree_skb(skb);
533 goto errout;
534 }
535 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
536 return;
537 errout:
538 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
539 }
540
541 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
542 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
543 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
544 };
545
546 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
547 struct nlmsghdr *nlh,
548 void *arg)
549 {
550 struct net *net = sock_net(in_skb->sk);
551 struct nlattr *tb[NETCONFA_MAX+1];
552 struct netconfmsg *ncm;
553 struct sk_buff *skb;
554 struct ipv6_devconf *devconf;
555 struct inet6_dev *in6_dev;
556 struct net_device *dev;
557 int ifindex;
558 int err;
559
560 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
561 devconf_ipv6_policy);
562 if (err < 0)
563 goto errout;
564
565 err = EINVAL;
566 if (!tb[NETCONFA_IFINDEX])
567 goto errout;
568
569 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
570 switch (ifindex) {
571 case NETCONFA_IFINDEX_ALL:
572 devconf = net->ipv6.devconf_all;
573 break;
574 case NETCONFA_IFINDEX_DEFAULT:
575 devconf = net->ipv6.devconf_dflt;
576 break;
577 default:
578 dev = __dev_get_by_index(net, ifindex);
579 if (dev == NULL)
580 goto errout;
581 in6_dev = __in6_dev_get(dev);
582 if (in6_dev == NULL)
583 goto errout;
584 devconf = &in6_dev->cnf;
585 break;
586 }
587
588 err = -ENOBUFS;
589 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
590 if (skb == NULL)
591 goto errout;
592
593 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
594 NETLINK_CB(in_skb).portid,
595 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
596 -1);
597 if (err < 0) {
598 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
599 WARN_ON(err == -EMSGSIZE);
600 kfree_skb(skb);
601 goto errout;
602 }
603 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
604 errout:
605 return err;
606 }
607
608 #ifdef CONFIG_SYSCTL
609 static void dev_forward_change(struct inet6_dev *idev)
610 {
611 struct net_device *dev;
612 struct inet6_ifaddr *ifa;
613
614 if (!idev)
615 return;
616 dev = idev->dev;
617 if (idev->cnf.forwarding)
618 dev_disable_lro(dev);
619 if (dev->flags & IFF_MULTICAST) {
620 if (idev->cnf.forwarding) {
621 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
622 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
623 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
624 } else {
625 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
626 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
627 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
628 }
629 }
630
631 list_for_each_entry(ifa, &idev->addr_list, if_list) {
632 if (ifa->flags&IFA_F_TENTATIVE)
633 continue;
634 if (idev->cnf.forwarding)
635 addrconf_join_anycast(ifa);
636 else
637 addrconf_leave_anycast(ifa);
638 }
639 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
640 dev->ifindex, &idev->cnf);
641 }
642
643
644 static void addrconf_forward_change(struct net *net, __s32 newf)
645 {
646 struct net_device *dev;
647 struct inet6_dev *idev;
648
649 for_each_netdev(net, dev) {
650 idev = __in6_dev_get(dev);
651 if (idev) {
652 int changed = (!idev->cnf.forwarding) ^ (!newf);
653 idev->cnf.forwarding = newf;
654 if (changed)
655 dev_forward_change(idev);
656 }
657 }
658 }
659
660 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
661 {
662 struct net *net;
663 int old;
664
665 if (!rtnl_trylock())
666 return restart_syscall();
667
668 net = (struct net *)table->extra2;
669 old = *p;
670 *p = newf;
671
672 if (p == &net->ipv6.devconf_dflt->forwarding) {
673 if ((!newf) ^ (!old))
674 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
675 NETCONFA_IFINDEX_DEFAULT,
676 net->ipv6.devconf_dflt);
677 rtnl_unlock();
678 return 0;
679 }
680
681 if (p == &net->ipv6.devconf_all->forwarding) {
682 net->ipv6.devconf_dflt->forwarding = newf;
683 addrconf_forward_change(net, newf);
684 if ((!newf) ^ (!old))
685 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
686 NETCONFA_IFINDEX_ALL,
687 net->ipv6.devconf_all);
688 } else if ((!newf) ^ (!old))
689 dev_forward_change((struct inet6_dev *)table->extra1);
690 rtnl_unlock();
691
692 if (newf)
693 rt6_purge_dflt_routers(net);
694 return 1;
695 }
696 #endif
697
698 /* Nobody refers to this ifaddr, destroy it */
699 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
700 {
701 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
702
703 #ifdef NET_REFCNT_DEBUG
704 pr_debug("%s\n", __func__);
705 #endif
706
707 in6_dev_put(ifp->idev);
708
709 if (del_timer(&ifp->timer))
710 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
711
712 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
713 pr_warn("Freeing alive inet6 address %p\n", ifp);
714 return;
715 }
716 ip6_rt_put(ifp->rt);
717
718 kfree_rcu(ifp, rcu);
719 }
720
721 static void
722 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
723 {
724 struct list_head *p;
725 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
726
727 /*
728 * Each device address list is sorted in order of scope -
729 * global before linklocal.
730 */
731 list_for_each(p, &idev->addr_list) {
732 struct inet6_ifaddr *ifa
733 = list_entry(p, struct inet6_ifaddr, if_list);
734 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
735 break;
736 }
737
738 list_add_tail(&ifp->if_list, p);
739 }
740
741 static u32 inet6_addr_hash(const struct in6_addr *addr)
742 {
743 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
744 }
745
746 /* On success it returns ifp with increased reference count */
747
748 static struct inet6_ifaddr *
749 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
750 int scope, u32 flags)
751 {
752 struct inet6_ifaddr *ifa = NULL;
753 struct rt6_info *rt;
754 unsigned int hash;
755 int err = 0;
756 int addr_type = ipv6_addr_type(addr);
757
758 if (addr_type == IPV6_ADDR_ANY ||
759 addr_type & IPV6_ADDR_MULTICAST ||
760 (!(idev->dev->flags & IFF_LOOPBACK) &&
761 addr_type & IPV6_ADDR_LOOPBACK))
762 return ERR_PTR(-EADDRNOTAVAIL);
763
764 rcu_read_lock_bh();
765 if (idev->dead) {
766 err = -ENODEV; /*XXX*/
767 goto out2;
768 }
769
770 if (idev->cnf.disable_ipv6) {
771 err = -EACCES;
772 goto out2;
773 }
774
775 spin_lock(&addrconf_hash_lock);
776
777 /* Ignore adding duplicate addresses on an interface */
778 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
779 ADBG(("ipv6_add_addr: already assigned\n"));
780 err = -EEXIST;
781 goto out;
782 }
783
784 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
785
786 if (ifa == NULL) {
787 ADBG(("ipv6_add_addr: malloc failed\n"));
788 err = -ENOBUFS;
789 goto out;
790 }
791
792 rt = addrconf_dst_alloc(idev, addr, false);
793 if (IS_ERR(rt)) {
794 err = PTR_ERR(rt);
795 goto out;
796 }
797
798 ifa->addr = *addr;
799
800 spin_lock_init(&ifa->lock);
801 spin_lock_init(&ifa->state_lock);
802 init_timer(&ifa->timer);
803 INIT_HLIST_NODE(&ifa->addr_lst);
804 ifa->timer.data = (unsigned long) ifa;
805 ifa->scope = scope;
806 ifa->prefix_len = pfxlen;
807 ifa->flags = flags | IFA_F_TENTATIVE;
808 ifa->cstamp = ifa->tstamp = jiffies;
809
810 ifa->rt = rt;
811
812 ifa->idev = idev;
813 in6_dev_hold(idev);
814 /* For caller */
815 in6_ifa_hold(ifa);
816
817 /* Add to big hash table */
818 hash = inet6_addr_hash(addr);
819
820 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
821 spin_unlock(&addrconf_hash_lock);
822
823 write_lock(&idev->lock);
824 /* Add to inet6_dev unicast addr list. */
825 ipv6_link_dev_addr(idev, ifa);
826
827 #ifdef CONFIG_IPV6_PRIVACY
828 if (ifa->flags&IFA_F_TEMPORARY) {
829 list_add(&ifa->tmp_list, &idev->tempaddr_list);
830 in6_ifa_hold(ifa);
831 }
832 #endif
833
834 in6_ifa_hold(ifa);
835 write_unlock(&idev->lock);
836 out2:
837 rcu_read_unlock_bh();
838
839 if (likely(err == 0))
840 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
841 else {
842 kfree(ifa);
843 ifa = ERR_PTR(err);
844 }
845
846 return ifa;
847 out:
848 spin_unlock(&addrconf_hash_lock);
849 goto out2;
850 }
851
852 /* This function wants to get referenced ifp and releases it before return */
853
854 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
855 {
856 struct inet6_ifaddr *ifa, *ifn;
857 struct inet6_dev *idev = ifp->idev;
858 int state;
859 int deleted = 0, onlink = 0;
860 unsigned long expires = jiffies;
861
862 spin_lock_bh(&ifp->state_lock);
863 state = ifp->state;
864 ifp->state = INET6_IFADDR_STATE_DEAD;
865 spin_unlock_bh(&ifp->state_lock);
866
867 if (state == INET6_IFADDR_STATE_DEAD)
868 goto out;
869
870 spin_lock_bh(&addrconf_hash_lock);
871 hlist_del_init_rcu(&ifp->addr_lst);
872 spin_unlock_bh(&addrconf_hash_lock);
873
874 write_lock_bh(&idev->lock);
875 #ifdef CONFIG_IPV6_PRIVACY
876 if (ifp->flags&IFA_F_TEMPORARY) {
877 list_del(&ifp->tmp_list);
878 if (ifp->ifpub) {
879 in6_ifa_put(ifp->ifpub);
880 ifp->ifpub = NULL;
881 }
882 __in6_ifa_put(ifp);
883 }
884 #endif
885
886 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
887 if (ifa == ifp) {
888 list_del_init(&ifp->if_list);
889 __in6_ifa_put(ifp);
890
891 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
892 break;
893 deleted = 1;
894 continue;
895 } else if (ifp->flags & IFA_F_PERMANENT) {
896 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
897 ifp->prefix_len)) {
898 if (ifa->flags & IFA_F_PERMANENT) {
899 onlink = 1;
900 if (deleted)
901 break;
902 } else {
903 unsigned long lifetime;
904
905 if (!onlink)
906 onlink = -1;
907
908 spin_lock(&ifa->lock);
909
910 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
911 /*
912 * Note: Because this address is
913 * not permanent, lifetime <
914 * LONG_MAX / HZ here.
915 */
916 if (time_before(expires,
917 ifa->tstamp + lifetime * HZ))
918 expires = ifa->tstamp + lifetime * HZ;
919 spin_unlock(&ifa->lock);
920 }
921 }
922 }
923 }
924 write_unlock_bh(&idev->lock);
925
926 addrconf_del_timer(ifp);
927
928 ipv6_ifa_notify(RTM_DELADDR, ifp);
929
930 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
931
932 /*
933 * Purge or update corresponding prefix
934 *
935 * 1) we don't purge prefix here if address was not permanent.
936 * prefix is managed by its own lifetime.
937 * 2) if there're no addresses, delete prefix.
938 * 3) if there're still other permanent address(es),
939 * corresponding prefix is still permanent.
940 * 4) otherwise, update prefix lifetime to the
941 * longest valid lifetime among the corresponding
942 * addresses on the device.
943 * Note: subsequent RA will update lifetime.
944 *
945 * --yoshfuji
946 */
947 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
948 struct in6_addr prefix;
949 struct rt6_info *rt;
950
951 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
952
953 rt = addrconf_get_prefix_route(&prefix,
954 ifp->prefix_len,
955 ifp->idev->dev,
956 0, RTF_GATEWAY | RTF_DEFAULT);
957
958 if (rt) {
959 if (onlink == 0) {
960 ip6_del_rt(rt);
961 rt = NULL;
962 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
963 rt6_set_expires(rt, expires);
964 }
965 }
966 ip6_rt_put(rt);
967 }
968
969 /* clean up prefsrc entries */
970 rt6_remove_prefsrc(ifp);
971 out:
972 in6_ifa_put(ifp);
973 }
974
975 #ifdef CONFIG_IPV6_PRIVACY
976 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
977 {
978 struct inet6_dev *idev = ifp->idev;
979 struct in6_addr addr, *tmpaddr;
980 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
981 unsigned long regen_advance;
982 int tmp_plen;
983 int ret = 0;
984 int max_addresses;
985 u32 addr_flags;
986 unsigned long now = jiffies;
987
988 write_lock(&idev->lock);
989 if (ift) {
990 spin_lock_bh(&ift->lock);
991 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
992 spin_unlock_bh(&ift->lock);
993 tmpaddr = &addr;
994 } else {
995 tmpaddr = NULL;
996 }
997 retry:
998 in6_dev_hold(idev);
999 if (idev->cnf.use_tempaddr <= 0) {
1000 write_unlock(&idev->lock);
1001 pr_info("%s: use_tempaddr is disabled\n", __func__);
1002 in6_dev_put(idev);
1003 ret = -1;
1004 goto out;
1005 }
1006 spin_lock_bh(&ifp->lock);
1007 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1008 idev->cnf.use_tempaddr = -1; /*XXX*/
1009 spin_unlock_bh(&ifp->lock);
1010 write_unlock(&idev->lock);
1011 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1012 __func__);
1013 in6_dev_put(idev);
1014 ret = -1;
1015 goto out;
1016 }
1017 in6_ifa_hold(ifp);
1018 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1019 __ipv6_try_regen_rndid(idev, tmpaddr);
1020 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1021 age = (now - ifp->tstamp) / HZ;
1022 tmp_valid_lft = min_t(__u32,
1023 ifp->valid_lft,
1024 idev->cnf.temp_valid_lft + age);
1025 tmp_prefered_lft = min_t(__u32,
1026 ifp->prefered_lft,
1027 idev->cnf.temp_prefered_lft + age -
1028 idev->cnf.max_desync_factor);
1029 tmp_plen = ifp->prefix_len;
1030 max_addresses = idev->cnf.max_addresses;
1031 tmp_tstamp = ifp->tstamp;
1032 spin_unlock_bh(&ifp->lock);
1033
1034 regen_advance = idev->cnf.regen_max_retry *
1035 idev->cnf.dad_transmits *
1036 idev->nd_parms->retrans_time / HZ;
1037 write_unlock(&idev->lock);
1038
1039 /* A temporary address is created only if this calculated Preferred
1040 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1041 * an implementation must not create a temporary address with a zero
1042 * Preferred Lifetime.
1043 */
1044 if (tmp_prefered_lft <= regen_advance) {
1045 in6_ifa_put(ifp);
1046 in6_dev_put(idev);
1047 ret = -1;
1048 goto out;
1049 }
1050
1051 addr_flags = IFA_F_TEMPORARY;
1052 /* set in addrconf_prefix_rcv() */
1053 if (ifp->flags & IFA_F_OPTIMISTIC)
1054 addr_flags |= IFA_F_OPTIMISTIC;
1055
1056 ift = !max_addresses ||
1057 ipv6_count_addresses(idev) < max_addresses ?
1058 ipv6_add_addr(idev, &addr, tmp_plen,
1059 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1060 addr_flags) : NULL;
1061 if (IS_ERR_OR_NULL(ift)) {
1062 in6_ifa_put(ifp);
1063 in6_dev_put(idev);
1064 pr_info("%s: retry temporary address regeneration\n", __func__);
1065 tmpaddr = &addr;
1066 write_lock(&idev->lock);
1067 goto retry;
1068 }
1069
1070 spin_lock_bh(&ift->lock);
1071 ift->ifpub = ifp;
1072 ift->valid_lft = tmp_valid_lft;
1073 ift->prefered_lft = tmp_prefered_lft;
1074 ift->cstamp = now;
1075 ift->tstamp = tmp_tstamp;
1076 spin_unlock_bh(&ift->lock);
1077
1078 addrconf_dad_start(ift);
1079 in6_ifa_put(ift);
1080 in6_dev_put(idev);
1081 out:
1082 return ret;
1083 }
1084 #endif
1085
1086 /*
1087 * Choose an appropriate source address (RFC3484)
1088 */
1089 enum {
1090 IPV6_SADDR_RULE_INIT = 0,
1091 IPV6_SADDR_RULE_LOCAL,
1092 IPV6_SADDR_RULE_SCOPE,
1093 IPV6_SADDR_RULE_PREFERRED,
1094 #ifdef CONFIG_IPV6_MIP6
1095 IPV6_SADDR_RULE_HOA,
1096 #endif
1097 IPV6_SADDR_RULE_OIF,
1098 IPV6_SADDR_RULE_LABEL,
1099 #ifdef CONFIG_IPV6_PRIVACY
1100 IPV6_SADDR_RULE_PRIVACY,
1101 #endif
1102 IPV6_SADDR_RULE_ORCHID,
1103 IPV6_SADDR_RULE_PREFIX,
1104 IPV6_SADDR_RULE_MAX
1105 };
1106
1107 struct ipv6_saddr_score {
1108 int rule;
1109 int addr_type;
1110 struct inet6_ifaddr *ifa;
1111 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1112 int scopedist;
1113 int matchlen;
1114 };
1115
1116 struct ipv6_saddr_dst {
1117 const struct in6_addr *addr;
1118 int ifindex;
1119 int scope;
1120 int label;
1121 unsigned int prefs;
1122 };
1123
1124 static inline int ipv6_saddr_preferred(int type)
1125 {
1126 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1127 return 1;
1128 return 0;
1129 }
1130
1131 static int ipv6_get_saddr_eval(struct net *net,
1132 struct ipv6_saddr_score *score,
1133 struct ipv6_saddr_dst *dst,
1134 int i)
1135 {
1136 int ret;
1137
1138 if (i <= score->rule) {
1139 switch (i) {
1140 case IPV6_SADDR_RULE_SCOPE:
1141 ret = score->scopedist;
1142 break;
1143 case IPV6_SADDR_RULE_PREFIX:
1144 ret = score->matchlen;
1145 break;
1146 default:
1147 ret = !!test_bit(i, score->scorebits);
1148 }
1149 goto out;
1150 }
1151
1152 switch (i) {
1153 case IPV6_SADDR_RULE_INIT:
1154 /* Rule 0: remember if hiscore is not ready yet */
1155 ret = !!score->ifa;
1156 break;
1157 case IPV6_SADDR_RULE_LOCAL:
1158 /* Rule 1: Prefer same address */
1159 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1160 break;
1161 case IPV6_SADDR_RULE_SCOPE:
1162 /* Rule 2: Prefer appropriate scope
1163 *
1164 * ret
1165 * ^
1166 * -1 | d 15
1167 * ---+--+-+---> scope
1168 * |
1169 * | d is scope of the destination.
1170 * B-d | \
1171 * | \ <- smaller scope is better if
1172 * B-15 | \ if scope is enough for destinaion.
1173 * | ret = B - scope (-1 <= scope >= d <= 15).
1174 * d-C-1 | /
1175 * |/ <- greater is better
1176 * -C / if scope is not enough for destination.
1177 * /| ret = scope - C (-1 <= d < scope <= 15).
1178 *
1179 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1180 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1181 * Assume B = 0 and we get C > 29.
1182 */
1183 ret = __ipv6_addr_src_scope(score->addr_type);
1184 if (ret >= dst->scope)
1185 ret = -ret;
1186 else
1187 ret -= 128; /* 30 is enough */
1188 score->scopedist = ret;
1189 break;
1190 case IPV6_SADDR_RULE_PREFERRED:
1191 /* Rule 3: Avoid deprecated and optimistic addresses */
1192 ret = ipv6_saddr_preferred(score->addr_type) ||
1193 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1194 break;
1195 #ifdef CONFIG_IPV6_MIP6
1196 case IPV6_SADDR_RULE_HOA:
1197 {
1198 /* Rule 4: Prefer home address */
1199 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1200 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1201 break;
1202 }
1203 #endif
1204 case IPV6_SADDR_RULE_OIF:
1205 /* Rule 5: Prefer outgoing interface */
1206 ret = (!dst->ifindex ||
1207 dst->ifindex == score->ifa->idev->dev->ifindex);
1208 break;
1209 case IPV6_SADDR_RULE_LABEL:
1210 /* Rule 6: Prefer matching label */
1211 ret = ipv6_addr_label(net,
1212 &score->ifa->addr, score->addr_type,
1213 score->ifa->idev->dev->ifindex) == dst->label;
1214 break;
1215 #ifdef CONFIG_IPV6_PRIVACY
1216 case IPV6_SADDR_RULE_PRIVACY:
1217 {
1218 /* Rule 7: Prefer public address
1219 * Note: prefer temporary address if use_tempaddr >= 2
1220 */
1221 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1222 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1223 score->ifa->idev->cnf.use_tempaddr >= 2;
1224 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1225 break;
1226 }
1227 #endif
1228 case IPV6_SADDR_RULE_ORCHID:
1229 /* Rule 8-: Prefer ORCHID vs ORCHID or
1230 * non-ORCHID vs non-ORCHID
1231 */
1232 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1233 ipv6_addr_orchid(dst->addr));
1234 break;
1235 case IPV6_SADDR_RULE_PREFIX:
1236 /* Rule 8: Use longest matching prefix */
1237 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1238 if (ret > score->ifa->prefix_len)
1239 ret = score->ifa->prefix_len;
1240 score->matchlen = ret;
1241 break;
1242 default:
1243 ret = 0;
1244 }
1245
1246 if (ret)
1247 __set_bit(i, score->scorebits);
1248 score->rule = i;
1249 out:
1250 return ret;
1251 }
1252
1253 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1254 const struct in6_addr *daddr, unsigned int prefs,
1255 struct in6_addr *saddr)
1256 {
1257 struct ipv6_saddr_score scores[2],
1258 *score = &scores[0], *hiscore = &scores[1];
1259 struct ipv6_saddr_dst dst;
1260 struct net_device *dev;
1261 int dst_type;
1262
1263 dst_type = __ipv6_addr_type(daddr);
1264 dst.addr = daddr;
1265 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1266 dst.scope = __ipv6_addr_src_scope(dst_type);
1267 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1268 dst.prefs = prefs;
1269
1270 hiscore->rule = -1;
1271 hiscore->ifa = NULL;
1272
1273 rcu_read_lock();
1274
1275 for_each_netdev_rcu(net, dev) {
1276 struct inet6_dev *idev;
1277
1278 /* Candidate Source Address (section 4)
1279 * - multicast and link-local destination address,
1280 * the set of candidate source address MUST only
1281 * include addresses assigned to interfaces
1282 * belonging to the same link as the outgoing
1283 * interface.
1284 * (- For site-local destination addresses, the
1285 * set of candidate source addresses MUST only
1286 * include addresses assigned to interfaces
1287 * belonging to the same site as the outgoing
1288 * interface.)
1289 */
1290 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1291 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1292 dst.ifindex && dev->ifindex != dst.ifindex)
1293 continue;
1294
1295 idev = __in6_dev_get(dev);
1296 if (!idev)
1297 continue;
1298
1299 read_lock_bh(&idev->lock);
1300 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1301 int i;
1302
1303 /*
1304 * - Tentative Address (RFC2462 section 5.4)
1305 * - A tentative address is not considered
1306 * "assigned to an interface" in the traditional
1307 * sense, unless it is also flagged as optimistic.
1308 * - Candidate Source Address (section 4)
1309 * - In any case, anycast addresses, multicast
1310 * addresses, and the unspecified address MUST
1311 * NOT be included in a candidate set.
1312 */
1313 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1314 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1315 continue;
1316
1317 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1318
1319 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1320 score->addr_type & IPV6_ADDR_MULTICAST)) {
1321 LIMIT_NETDEBUG(KERN_DEBUG
1322 "ADDRCONF: unspecified / multicast address "
1323 "assigned as unicast address on %s",
1324 dev->name);
1325 continue;
1326 }
1327
1328 score->rule = -1;
1329 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1330
1331 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1332 int minihiscore, miniscore;
1333
1334 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1335 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1336
1337 if (minihiscore > miniscore) {
1338 if (i == IPV6_SADDR_RULE_SCOPE &&
1339 score->scopedist > 0) {
1340 /*
1341 * special case:
1342 * each remaining entry
1343 * has too small (not enough)
1344 * scope, because ifa entries
1345 * are sorted by their scope
1346 * values.
1347 */
1348 goto try_nextdev;
1349 }
1350 break;
1351 } else if (minihiscore < miniscore) {
1352 if (hiscore->ifa)
1353 in6_ifa_put(hiscore->ifa);
1354
1355 in6_ifa_hold(score->ifa);
1356
1357 swap(hiscore, score);
1358
1359 /* restore our iterator */
1360 score->ifa = hiscore->ifa;
1361
1362 break;
1363 }
1364 }
1365 }
1366 try_nextdev:
1367 read_unlock_bh(&idev->lock);
1368 }
1369 rcu_read_unlock();
1370
1371 if (!hiscore->ifa)
1372 return -EADDRNOTAVAIL;
1373
1374 *saddr = hiscore->ifa->addr;
1375 in6_ifa_put(hiscore->ifa);
1376 return 0;
1377 }
1378 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1379
1380 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1381 unsigned char banned_flags)
1382 {
1383 struct inet6_dev *idev;
1384 int err = -EADDRNOTAVAIL;
1385
1386 rcu_read_lock();
1387 idev = __in6_dev_get(dev);
1388 if (idev) {
1389 struct inet6_ifaddr *ifp;
1390
1391 read_lock_bh(&idev->lock);
1392 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1393 if (ifp->scope == IFA_LINK &&
1394 !(ifp->flags & banned_flags)) {
1395 *addr = ifp->addr;
1396 err = 0;
1397 break;
1398 }
1399 }
1400 read_unlock_bh(&idev->lock);
1401 }
1402 rcu_read_unlock();
1403 return err;
1404 }
1405
1406 static int ipv6_count_addresses(struct inet6_dev *idev)
1407 {
1408 int cnt = 0;
1409 struct inet6_ifaddr *ifp;
1410
1411 read_lock_bh(&idev->lock);
1412 list_for_each_entry(ifp, &idev->addr_list, if_list)
1413 cnt++;
1414 read_unlock_bh(&idev->lock);
1415 return cnt;
1416 }
1417
1418 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1419 struct net_device *dev, int strict)
1420 {
1421 struct inet6_ifaddr *ifp;
1422 unsigned int hash = inet6_addr_hash(addr);
1423
1424 rcu_read_lock_bh();
1425 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1426 if (!net_eq(dev_net(ifp->idev->dev), net))
1427 continue;
1428 if (ipv6_addr_equal(&ifp->addr, addr) &&
1429 !(ifp->flags&IFA_F_TENTATIVE) &&
1430 (dev == NULL || ifp->idev->dev == dev ||
1431 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1432 rcu_read_unlock_bh();
1433 return 1;
1434 }
1435 }
1436
1437 rcu_read_unlock_bh();
1438 return 0;
1439 }
1440 EXPORT_SYMBOL(ipv6_chk_addr);
1441
1442 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1443 struct net_device *dev)
1444 {
1445 unsigned int hash = inet6_addr_hash(addr);
1446 struct inet6_ifaddr *ifp;
1447
1448 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1449 if (!net_eq(dev_net(ifp->idev->dev), net))
1450 continue;
1451 if (ipv6_addr_equal(&ifp->addr, addr)) {
1452 if (dev == NULL || ifp->idev->dev == dev)
1453 return true;
1454 }
1455 }
1456 return false;
1457 }
1458
1459 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1460 {
1461 struct inet6_dev *idev;
1462 struct inet6_ifaddr *ifa;
1463 int onlink;
1464
1465 onlink = 0;
1466 rcu_read_lock();
1467 idev = __in6_dev_get(dev);
1468 if (idev) {
1469 read_lock_bh(&idev->lock);
1470 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1471 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1472 ifa->prefix_len);
1473 if (onlink)
1474 break;
1475 }
1476 read_unlock_bh(&idev->lock);
1477 }
1478 rcu_read_unlock();
1479 return onlink;
1480 }
1481 EXPORT_SYMBOL(ipv6_chk_prefix);
1482
1483 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1484 struct net_device *dev, int strict)
1485 {
1486 struct inet6_ifaddr *ifp, *result = NULL;
1487 unsigned int hash = inet6_addr_hash(addr);
1488
1489 rcu_read_lock_bh();
1490 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1491 if (!net_eq(dev_net(ifp->idev->dev), net))
1492 continue;
1493 if (ipv6_addr_equal(&ifp->addr, addr)) {
1494 if (dev == NULL || ifp->idev->dev == dev ||
1495 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1496 result = ifp;
1497 in6_ifa_hold(ifp);
1498 break;
1499 }
1500 }
1501 }
1502 rcu_read_unlock_bh();
1503
1504 return result;
1505 }
1506
1507 /* Gets referenced address, destroys ifaddr */
1508
1509 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1510 {
1511 if (ifp->flags&IFA_F_PERMANENT) {
1512 spin_lock_bh(&ifp->lock);
1513 addrconf_del_timer(ifp);
1514 ifp->flags |= IFA_F_TENTATIVE;
1515 if (dad_failed)
1516 ifp->flags |= IFA_F_DADFAILED;
1517 spin_unlock_bh(&ifp->lock);
1518 if (dad_failed)
1519 ipv6_ifa_notify(0, ifp);
1520 in6_ifa_put(ifp);
1521 #ifdef CONFIG_IPV6_PRIVACY
1522 } else if (ifp->flags&IFA_F_TEMPORARY) {
1523 struct inet6_ifaddr *ifpub;
1524 spin_lock_bh(&ifp->lock);
1525 ifpub = ifp->ifpub;
1526 if (ifpub) {
1527 in6_ifa_hold(ifpub);
1528 spin_unlock_bh(&ifp->lock);
1529 ipv6_create_tempaddr(ifpub, ifp);
1530 in6_ifa_put(ifpub);
1531 } else {
1532 spin_unlock_bh(&ifp->lock);
1533 }
1534 ipv6_del_addr(ifp);
1535 #endif
1536 } else
1537 ipv6_del_addr(ifp);
1538 }
1539
1540 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1541 {
1542 int err = -ENOENT;
1543
1544 spin_lock(&ifp->state_lock);
1545 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1546 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1547 err = 0;
1548 }
1549 spin_unlock(&ifp->state_lock);
1550
1551 return err;
1552 }
1553
1554 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1555 {
1556 struct inet6_dev *idev = ifp->idev;
1557
1558 if (addrconf_dad_end(ifp)) {
1559 in6_ifa_put(ifp);
1560 return;
1561 }
1562
1563 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1564 ifp->idev->dev->name, &ifp->addr);
1565
1566 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1567 struct in6_addr addr;
1568
1569 addr.s6_addr32[0] = htonl(0xfe800000);
1570 addr.s6_addr32[1] = 0;
1571
1572 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1573 ipv6_addr_equal(&ifp->addr, &addr)) {
1574 /* DAD failed for link-local based on MAC address */
1575 idev->cnf.disable_ipv6 = 1;
1576
1577 pr_info("%s: IPv6 being disabled!\n",
1578 ifp->idev->dev->name);
1579 }
1580 }
1581
1582 addrconf_dad_stop(ifp, 1);
1583 }
1584
1585 /* Join to solicited addr multicast group. */
1586
1587 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1588 {
1589 struct in6_addr maddr;
1590
1591 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1592 return;
1593
1594 addrconf_addr_solict_mult(addr, &maddr);
1595 ipv6_dev_mc_inc(dev, &maddr);
1596 }
1597
1598 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1599 {
1600 struct in6_addr maddr;
1601
1602 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1603 return;
1604
1605 addrconf_addr_solict_mult(addr, &maddr);
1606 __ipv6_dev_mc_dec(idev, &maddr);
1607 }
1608
1609 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1610 {
1611 struct in6_addr addr;
1612 if (ifp->prefix_len == 127) /* RFC 6164 */
1613 return;
1614 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1615 if (ipv6_addr_any(&addr))
1616 return;
1617 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1618 }
1619
1620 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1621 {
1622 struct in6_addr addr;
1623 if (ifp->prefix_len == 127) /* RFC 6164 */
1624 return;
1625 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1626 if (ipv6_addr_any(&addr))
1627 return;
1628 __ipv6_dev_ac_dec(ifp->idev, &addr);
1629 }
1630
1631 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1632 {
1633 if (dev->addr_len != ETH_ALEN)
1634 return -1;
1635 memcpy(eui, dev->dev_addr, 3);
1636 memcpy(eui + 5, dev->dev_addr + 3, 3);
1637
1638 /*
1639 * The zSeries OSA network cards can be shared among various
1640 * OS instances, but the OSA cards have only one MAC address.
1641 * This leads to duplicate address conflicts in conjunction
1642 * with IPv6 if more than one instance uses the same card.
1643 *
1644 * The driver for these cards can deliver a unique 16-bit
1645 * identifier for each instance sharing the same card. It is
1646 * placed instead of 0xFFFE in the interface identifier. The
1647 * "u" bit of the interface identifier is not inverted in this
1648 * case. Hence the resulting interface identifier has local
1649 * scope according to RFC2373.
1650 */
1651 if (dev->dev_id) {
1652 eui[3] = (dev->dev_id >> 8) & 0xFF;
1653 eui[4] = dev->dev_id & 0xFF;
1654 } else {
1655 eui[3] = 0xFF;
1656 eui[4] = 0xFE;
1657 eui[0] ^= 2;
1658 }
1659 return 0;
1660 }
1661
1662 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1663 {
1664 if (dev->addr_len != IEEE802154_ADDR_LEN)
1665 return -1;
1666 memcpy(eui, dev->dev_addr, 8);
1667 eui[0] ^= 2;
1668 return 0;
1669 }
1670
1671 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1672 {
1673 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1674 if (dev->addr_len != ARCNET_ALEN)
1675 return -1;
1676 memset(eui, 0, 7);
1677 eui[7] = *(u8 *)dev->dev_addr;
1678 return 0;
1679 }
1680
1681 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1682 {
1683 if (dev->addr_len != INFINIBAND_ALEN)
1684 return -1;
1685 memcpy(eui, dev->dev_addr + 12, 8);
1686 eui[0] |= 2;
1687 return 0;
1688 }
1689
1690 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1691 {
1692 if (addr == 0)
1693 return -1;
1694 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1695 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1696 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1697 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1698 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1699 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1700 eui[1] = 0;
1701 eui[2] = 0x5E;
1702 eui[3] = 0xFE;
1703 memcpy(eui + 4, &addr, 4);
1704 return 0;
1705 }
1706
1707 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1708 {
1709 if (dev->priv_flags & IFF_ISATAP)
1710 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1711 return -1;
1712 }
1713
1714 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1715 {
1716 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1717 }
1718
1719 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1720 {
1721 switch (dev->type) {
1722 case ARPHRD_ETHER:
1723 case ARPHRD_FDDI:
1724 return addrconf_ifid_eui48(eui, dev);
1725 case ARPHRD_ARCNET:
1726 return addrconf_ifid_arcnet(eui, dev);
1727 case ARPHRD_INFINIBAND:
1728 return addrconf_ifid_infiniband(eui, dev);
1729 case ARPHRD_SIT:
1730 return addrconf_ifid_sit(eui, dev);
1731 case ARPHRD_IPGRE:
1732 return addrconf_ifid_gre(eui, dev);
1733 case ARPHRD_IEEE802154:
1734 return addrconf_ifid_eui64(eui, dev);
1735 }
1736 return -1;
1737 }
1738
1739 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1740 {
1741 int err = -1;
1742 struct inet6_ifaddr *ifp;
1743
1744 read_lock_bh(&idev->lock);
1745 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1746 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1747 memcpy(eui, ifp->addr.s6_addr+8, 8);
1748 err = 0;
1749 break;
1750 }
1751 }
1752 read_unlock_bh(&idev->lock);
1753 return err;
1754 }
1755
1756 #ifdef CONFIG_IPV6_PRIVACY
1757 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1758 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1759 {
1760 regen:
1761 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1762 idev->rndid[0] &= ~0x02;
1763
1764 /*
1765 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1766 * check if generated address is not inappropriate
1767 *
1768 * - Reserved subnet anycast (RFC 2526)
1769 * 11111101 11....11 1xxxxxxx
1770 * - ISATAP (RFC4214) 6.1
1771 * 00-00-5E-FE-xx-xx-xx-xx
1772 * - value 0
1773 * - XXX: already assigned to an address on the device
1774 */
1775 if (idev->rndid[0] == 0xfd &&
1776 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1777 (idev->rndid[7]&0x80))
1778 goto regen;
1779 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1780 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1781 goto regen;
1782 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1783 goto regen;
1784 }
1785 }
1786
1787 static void ipv6_regen_rndid(unsigned long data)
1788 {
1789 struct inet6_dev *idev = (struct inet6_dev *) data;
1790 unsigned long expires;
1791
1792 rcu_read_lock_bh();
1793 write_lock_bh(&idev->lock);
1794
1795 if (idev->dead)
1796 goto out;
1797
1798 __ipv6_regen_rndid(idev);
1799
1800 expires = jiffies +
1801 idev->cnf.temp_prefered_lft * HZ -
1802 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1803 idev->cnf.max_desync_factor * HZ;
1804 if (time_before(expires, jiffies)) {
1805 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1806 __func__, idev->dev->name);
1807 goto out;
1808 }
1809
1810 if (!mod_timer(&idev->regen_timer, expires))
1811 in6_dev_hold(idev);
1812
1813 out:
1814 write_unlock_bh(&idev->lock);
1815 rcu_read_unlock_bh();
1816 in6_dev_put(idev);
1817 }
1818
1819 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1820 {
1821 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1822 __ipv6_regen_rndid(idev);
1823 }
1824 #endif
1825
1826 /*
1827 * Add prefix route.
1828 */
1829
1830 static void
1831 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1832 unsigned long expires, u32 flags)
1833 {
1834 struct fib6_config cfg = {
1835 .fc_table = RT6_TABLE_PREFIX,
1836 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1837 .fc_ifindex = dev->ifindex,
1838 .fc_expires = expires,
1839 .fc_dst_len = plen,
1840 .fc_flags = RTF_UP | flags,
1841 .fc_nlinfo.nl_net = dev_net(dev),
1842 .fc_protocol = RTPROT_KERNEL,
1843 };
1844
1845 cfg.fc_dst = *pfx;
1846
1847 /* Prevent useless cloning on PtP SIT.
1848 This thing is done here expecting that the whole
1849 class of non-broadcast devices need not cloning.
1850 */
1851 #if IS_ENABLED(CONFIG_IPV6_SIT)
1852 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1853 cfg.fc_flags |= RTF_NONEXTHOP;
1854 #endif
1855
1856 ip6_route_add(&cfg);
1857 }
1858
1859
1860 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1861 int plen,
1862 const struct net_device *dev,
1863 u32 flags, u32 noflags)
1864 {
1865 struct fib6_node *fn;
1866 struct rt6_info *rt = NULL;
1867 struct fib6_table *table;
1868
1869 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1870 if (table == NULL)
1871 return NULL;
1872
1873 read_lock_bh(&table->tb6_lock);
1874 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1875 if (!fn)
1876 goto out;
1877 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1878 if (rt->dst.dev->ifindex != dev->ifindex)
1879 continue;
1880 if ((rt->rt6i_flags & flags) != flags)
1881 continue;
1882 if ((rt->rt6i_flags & noflags) != 0)
1883 continue;
1884 dst_hold(&rt->dst);
1885 break;
1886 }
1887 out:
1888 read_unlock_bh(&table->tb6_lock);
1889 return rt;
1890 }
1891
1892
1893 /* Create "default" multicast route to the interface */
1894
1895 static void addrconf_add_mroute(struct net_device *dev)
1896 {
1897 struct fib6_config cfg = {
1898 .fc_table = RT6_TABLE_LOCAL,
1899 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1900 .fc_ifindex = dev->ifindex,
1901 .fc_dst_len = 8,
1902 .fc_flags = RTF_UP,
1903 .fc_nlinfo.nl_net = dev_net(dev),
1904 };
1905
1906 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1907
1908 ip6_route_add(&cfg);
1909 }
1910
1911 #if IS_ENABLED(CONFIG_IPV6_SIT)
1912 static void sit_route_add(struct net_device *dev)
1913 {
1914 struct fib6_config cfg = {
1915 .fc_table = RT6_TABLE_MAIN,
1916 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1917 .fc_ifindex = dev->ifindex,
1918 .fc_dst_len = 96,
1919 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1920 .fc_nlinfo.nl_net = dev_net(dev),
1921 };
1922
1923 /* prefix length - 96 bits "::d.d.d.d" */
1924 ip6_route_add(&cfg);
1925 }
1926 #endif
1927
1928 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1929 {
1930 struct inet6_dev *idev;
1931
1932 ASSERT_RTNL();
1933
1934 idev = ipv6_find_idev(dev);
1935 if (!idev)
1936 return ERR_PTR(-ENOBUFS);
1937
1938 if (idev->cnf.disable_ipv6)
1939 return ERR_PTR(-EACCES);
1940
1941 /* Add default multicast route */
1942 if (!(dev->flags & IFF_LOOPBACK))
1943 addrconf_add_mroute(dev);
1944
1945 return idev;
1946 }
1947
1948 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1949 {
1950 struct prefix_info *pinfo;
1951 __u32 valid_lft;
1952 __u32 prefered_lft;
1953 int addr_type;
1954 struct inet6_dev *in6_dev;
1955 struct net *net = dev_net(dev);
1956
1957 pinfo = (struct prefix_info *) opt;
1958
1959 if (len < sizeof(struct prefix_info)) {
1960 ADBG(("addrconf: prefix option too short\n"));
1961 return;
1962 }
1963
1964 /*
1965 * Validation checks ([ADDRCONF], page 19)
1966 */
1967
1968 addr_type = ipv6_addr_type(&pinfo->prefix);
1969
1970 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1971 return;
1972
1973 valid_lft = ntohl(pinfo->valid);
1974 prefered_lft = ntohl(pinfo->prefered);
1975
1976 if (prefered_lft > valid_lft) {
1977 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1978 return;
1979 }
1980
1981 in6_dev = in6_dev_get(dev);
1982
1983 if (in6_dev == NULL) {
1984 net_dbg_ratelimited("addrconf: device %s not configured\n",
1985 dev->name);
1986 return;
1987 }
1988
1989 /*
1990 * Two things going on here:
1991 * 1) Add routes for on-link prefixes
1992 * 2) Configure prefixes with the auto flag set
1993 */
1994
1995 if (pinfo->onlink) {
1996 struct rt6_info *rt;
1997 unsigned long rt_expires;
1998
1999 /* Avoid arithmetic overflow. Really, we could
2000 * save rt_expires in seconds, likely valid_lft,
2001 * but it would require division in fib gc, that it
2002 * not good.
2003 */
2004 if (HZ > USER_HZ)
2005 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2006 else
2007 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2008
2009 if (addrconf_finite_timeout(rt_expires))
2010 rt_expires *= HZ;
2011
2012 rt = addrconf_get_prefix_route(&pinfo->prefix,
2013 pinfo->prefix_len,
2014 dev,
2015 RTF_ADDRCONF | RTF_PREFIX_RT,
2016 RTF_GATEWAY | RTF_DEFAULT);
2017
2018 if (rt) {
2019 /* Autoconf prefix route */
2020 if (valid_lft == 0) {
2021 ip6_del_rt(rt);
2022 rt = NULL;
2023 } else if (addrconf_finite_timeout(rt_expires)) {
2024 /* not infinity */
2025 rt6_set_expires(rt, jiffies + rt_expires);
2026 } else {
2027 rt6_clean_expires(rt);
2028 }
2029 } else if (valid_lft) {
2030 clock_t expires = 0;
2031 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2032 if (addrconf_finite_timeout(rt_expires)) {
2033 /* not infinity */
2034 flags |= RTF_EXPIRES;
2035 expires = jiffies_to_clock_t(rt_expires);
2036 }
2037 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2038 dev, expires, flags);
2039 }
2040 ip6_rt_put(rt);
2041 }
2042
2043 /* Try to figure out our local address for this prefix */
2044
2045 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2046 struct inet6_ifaddr *ifp;
2047 struct in6_addr addr;
2048 int create = 0, update_lft = 0;
2049
2050 if (pinfo->prefix_len == 64) {
2051 memcpy(&addr, &pinfo->prefix, 8);
2052 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2053 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2054 in6_dev_put(in6_dev);
2055 return;
2056 }
2057 goto ok;
2058 }
2059 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2060 pinfo->prefix_len);
2061 in6_dev_put(in6_dev);
2062 return;
2063
2064 ok:
2065
2066 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2067
2068 if (ifp == NULL && valid_lft) {
2069 int max_addresses = in6_dev->cnf.max_addresses;
2070 u32 addr_flags = 0;
2071
2072 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2073 if (in6_dev->cnf.optimistic_dad &&
2074 !net->ipv6.devconf_all->forwarding && sllao)
2075 addr_flags = IFA_F_OPTIMISTIC;
2076 #endif
2077
2078 /* Do not allow to create too much of autoconfigured
2079 * addresses; this would be too easy way to crash kernel.
2080 */
2081 if (!max_addresses ||
2082 ipv6_count_addresses(in6_dev) < max_addresses)
2083 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
2084 addr_type&IPV6_ADDR_SCOPE_MASK,
2085 addr_flags);
2086
2087 if (IS_ERR_OR_NULL(ifp)) {
2088 in6_dev_put(in6_dev);
2089 return;
2090 }
2091
2092 update_lft = create = 1;
2093 ifp->cstamp = jiffies;
2094 addrconf_dad_start(ifp);
2095 }
2096
2097 if (ifp) {
2098 int flags;
2099 unsigned long now;
2100 #ifdef CONFIG_IPV6_PRIVACY
2101 struct inet6_ifaddr *ift;
2102 #endif
2103 u32 stored_lft;
2104
2105 /* update lifetime (RFC2462 5.5.3 e) */
2106 spin_lock(&ifp->lock);
2107 now = jiffies;
2108 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2109 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2110 else
2111 stored_lft = 0;
2112 if (!update_lft && stored_lft) {
2113 if (valid_lft > MIN_VALID_LIFETIME ||
2114 valid_lft > stored_lft)
2115 update_lft = 1;
2116 else if (stored_lft <= MIN_VALID_LIFETIME) {
2117 /* valid_lft <= stored_lft is always true */
2118 /*
2119 * RFC 4862 Section 5.5.3e:
2120 * "Note that the preferred lifetime of
2121 * the corresponding address is always
2122 * reset to the Preferred Lifetime in
2123 * the received Prefix Information
2124 * option, regardless of whether the
2125 * valid lifetime is also reset or
2126 * ignored."
2127 *
2128 * So if the preferred lifetime in
2129 * this advertisement is different
2130 * than what we have stored, but the
2131 * valid lifetime is invalid, just
2132 * reset prefered_lft.
2133 *
2134 * We must set the valid lifetime
2135 * to the stored lifetime since we'll
2136 * be updating the timestamp below,
2137 * else we'll set it back to the
2138 * minimum.
2139 */
2140 if (prefered_lft != ifp->prefered_lft) {
2141 valid_lft = stored_lft;
2142 update_lft = 1;
2143 }
2144 } else {
2145 valid_lft = MIN_VALID_LIFETIME;
2146 if (valid_lft < prefered_lft)
2147 prefered_lft = valid_lft;
2148 update_lft = 1;
2149 }
2150 }
2151
2152 if (update_lft) {
2153 ifp->valid_lft = valid_lft;
2154 ifp->prefered_lft = prefered_lft;
2155 ifp->tstamp = now;
2156 flags = ifp->flags;
2157 ifp->flags &= ~IFA_F_DEPRECATED;
2158 spin_unlock(&ifp->lock);
2159
2160 if (!(flags&IFA_F_TENTATIVE))
2161 ipv6_ifa_notify(0, ifp);
2162 } else
2163 spin_unlock(&ifp->lock);
2164
2165 #ifdef CONFIG_IPV6_PRIVACY
2166 read_lock_bh(&in6_dev->lock);
2167 /* update all temporary addresses in the list */
2168 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2169 tmp_list) {
2170 int age, max_valid, max_prefered;
2171
2172 if (ifp != ift->ifpub)
2173 continue;
2174
2175 /*
2176 * RFC 4941 section 3.3:
2177 * If a received option will extend the lifetime
2178 * of a public address, the lifetimes of
2179 * temporary addresses should be extended,
2180 * subject to the overall constraint that no
2181 * temporary addresses should ever remain
2182 * "valid" or "preferred" for a time longer than
2183 * (TEMP_VALID_LIFETIME) or
2184 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2185 * respectively.
2186 */
2187 age = (now - ift->cstamp) / HZ;
2188 max_valid = in6_dev->cnf.temp_valid_lft - age;
2189 if (max_valid < 0)
2190 max_valid = 0;
2191
2192 max_prefered = in6_dev->cnf.temp_prefered_lft -
2193 in6_dev->cnf.max_desync_factor -
2194 age;
2195 if (max_prefered < 0)
2196 max_prefered = 0;
2197
2198 if (valid_lft > max_valid)
2199 valid_lft = max_valid;
2200
2201 if (prefered_lft > max_prefered)
2202 prefered_lft = max_prefered;
2203
2204 spin_lock(&ift->lock);
2205 flags = ift->flags;
2206 ift->valid_lft = valid_lft;
2207 ift->prefered_lft = prefered_lft;
2208 ift->tstamp = now;
2209 if (prefered_lft > 0)
2210 ift->flags &= ~IFA_F_DEPRECATED;
2211
2212 spin_unlock(&ift->lock);
2213 if (!(flags&IFA_F_TENTATIVE))
2214 ipv6_ifa_notify(0, ift);
2215 }
2216
2217 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2218 /*
2219 * When a new public address is created as
2220 * described in [ADDRCONF], also create a new
2221 * temporary address. Also create a temporary
2222 * address if it's enabled but no temporary
2223 * address currently exists.
2224 */
2225 read_unlock_bh(&in6_dev->lock);
2226 ipv6_create_tempaddr(ifp, NULL);
2227 } else {
2228 read_unlock_bh(&in6_dev->lock);
2229 }
2230 #endif
2231 in6_ifa_put(ifp);
2232 addrconf_verify(0);
2233 }
2234 }
2235 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2236 in6_dev_put(in6_dev);
2237 }
2238
2239 /*
2240 * Set destination address.
2241 * Special case for SIT interfaces where we create a new "virtual"
2242 * device.
2243 */
2244 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2245 {
2246 struct in6_ifreq ireq;
2247 struct net_device *dev;
2248 int err = -EINVAL;
2249
2250 rtnl_lock();
2251
2252 err = -EFAULT;
2253 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2254 goto err_exit;
2255
2256 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2257
2258 err = -ENODEV;
2259 if (dev == NULL)
2260 goto err_exit;
2261
2262 #if IS_ENABLED(CONFIG_IPV6_SIT)
2263 if (dev->type == ARPHRD_SIT) {
2264 const struct net_device_ops *ops = dev->netdev_ops;
2265 struct ifreq ifr;
2266 struct ip_tunnel_parm p;
2267
2268 err = -EADDRNOTAVAIL;
2269 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2270 goto err_exit;
2271
2272 memset(&p, 0, sizeof(p));
2273 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2274 p.iph.saddr = 0;
2275 p.iph.version = 4;
2276 p.iph.ihl = 5;
2277 p.iph.protocol = IPPROTO_IPV6;
2278 p.iph.ttl = 64;
2279 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2280
2281 if (ops->ndo_do_ioctl) {
2282 mm_segment_t oldfs = get_fs();
2283
2284 set_fs(KERNEL_DS);
2285 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2286 set_fs(oldfs);
2287 } else
2288 err = -EOPNOTSUPP;
2289
2290 if (err == 0) {
2291 err = -ENOBUFS;
2292 dev = __dev_get_by_name(net, p.name);
2293 if (!dev)
2294 goto err_exit;
2295 err = dev_open(dev);
2296 }
2297 }
2298 #endif
2299
2300 err_exit:
2301 rtnl_unlock();
2302 return err;
2303 }
2304
2305 /*
2306 * Manual configuration of address on an interface
2307 */
2308 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2309 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2310 __u32 valid_lft)
2311 {
2312 struct inet6_ifaddr *ifp;
2313 struct inet6_dev *idev;
2314 struct net_device *dev;
2315 int scope;
2316 u32 flags;
2317 clock_t expires;
2318 unsigned long timeout;
2319
2320 ASSERT_RTNL();
2321
2322 if (plen > 128)
2323 return -EINVAL;
2324
2325 /* check the lifetime */
2326 if (!valid_lft || prefered_lft > valid_lft)
2327 return -EINVAL;
2328
2329 dev = __dev_get_by_index(net, ifindex);
2330 if (!dev)
2331 return -ENODEV;
2332
2333 idev = addrconf_add_dev(dev);
2334 if (IS_ERR(idev))
2335 return PTR_ERR(idev);
2336
2337 scope = ipv6_addr_scope(pfx);
2338
2339 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2340 if (addrconf_finite_timeout(timeout)) {
2341 expires = jiffies_to_clock_t(timeout * HZ);
2342 valid_lft = timeout;
2343 flags = RTF_EXPIRES;
2344 } else {
2345 expires = 0;
2346 flags = 0;
2347 ifa_flags |= IFA_F_PERMANENT;
2348 }
2349
2350 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2351 if (addrconf_finite_timeout(timeout)) {
2352 if (timeout == 0)
2353 ifa_flags |= IFA_F_DEPRECATED;
2354 prefered_lft = timeout;
2355 }
2356
2357 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2358
2359 if (!IS_ERR(ifp)) {
2360 spin_lock_bh(&ifp->lock);
2361 ifp->valid_lft = valid_lft;
2362 ifp->prefered_lft = prefered_lft;
2363 ifp->tstamp = jiffies;
2364 spin_unlock_bh(&ifp->lock);
2365
2366 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2367 expires, flags);
2368 /*
2369 * Note that section 3.1 of RFC 4429 indicates
2370 * that the Optimistic flag should not be set for
2371 * manually configured addresses
2372 */
2373 addrconf_dad_start(ifp);
2374 in6_ifa_put(ifp);
2375 addrconf_verify(0);
2376 return 0;
2377 }
2378
2379 return PTR_ERR(ifp);
2380 }
2381
2382 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2383 unsigned int plen)
2384 {
2385 struct inet6_ifaddr *ifp;
2386 struct inet6_dev *idev;
2387 struct net_device *dev;
2388
2389 if (plen > 128)
2390 return -EINVAL;
2391
2392 dev = __dev_get_by_index(net, ifindex);
2393 if (!dev)
2394 return -ENODEV;
2395
2396 if ((idev = __in6_dev_get(dev)) == NULL)
2397 return -ENXIO;
2398
2399 read_lock_bh(&idev->lock);
2400 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2401 if (ifp->prefix_len == plen &&
2402 ipv6_addr_equal(pfx, &ifp->addr)) {
2403 in6_ifa_hold(ifp);
2404 read_unlock_bh(&idev->lock);
2405
2406 ipv6_del_addr(ifp);
2407
2408 /* If the last address is deleted administratively,
2409 disable IPv6 on this interface.
2410 */
2411 if (list_empty(&idev->addr_list))
2412 addrconf_ifdown(idev->dev, 1);
2413 return 0;
2414 }
2415 }
2416 read_unlock_bh(&idev->lock);
2417 return -EADDRNOTAVAIL;
2418 }
2419
2420
2421 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2422 {
2423 struct in6_ifreq ireq;
2424 int err;
2425
2426 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2427 return -EPERM;
2428
2429 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2430 return -EFAULT;
2431
2432 rtnl_lock();
2433 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2434 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2435 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2436 rtnl_unlock();
2437 return err;
2438 }
2439
2440 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2441 {
2442 struct in6_ifreq ireq;
2443 int err;
2444
2445 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2446 return -EPERM;
2447
2448 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2449 return -EFAULT;
2450
2451 rtnl_lock();
2452 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2453 ireq.ifr6_prefixlen);
2454 rtnl_unlock();
2455 return err;
2456 }
2457
2458 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2459 int plen, int scope)
2460 {
2461 struct inet6_ifaddr *ifp;
2462
2463 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2464 if (!IS_ERR(ifp)) {
2465 spin_lock_bh(&ifp->lock);
2466 ifp->flags &= ~IFA_F_TENTATIVE;
2467 spin_unlock_bh(&ifp->lock);
2468 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2469 in6_ifa_put(ifp);
2470 }
2471 }
2472
2473 #if IS_ENABLED(CONFIG_IPV6_SIT)
2474 static void sit_add_v4_addrs(struct inet6_dev *idev)
2475 {
2476 struct in6_addr addr;
2477 struct net_device *dev;
2478 struct net *net = dev_net(idev->dev);
2479 int scope;
2480
2481 ASSERT_RTNL();
2482
2483 memset(&addr, 0, sizeof(struct in6_addr));
2484 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2485
2486 if (idev->dev->flags&IFF_POINTOPOINT) {
2487 addr.s6_addr32[0] = htonl(0xfe800000);
2488 scope = IFA_LINK;
2489 } else {
2490 scope = IPV6_ADDR_COMPATv4;
2491 }
2492
2493 if (addr.s6_addr32[3]) {
2494 add_addr(idev, &addr, 128, scope);
2495 return;
2496 }
2497
2498 for_each_netdev(net, dev) {
2499 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2500 if (in_dev && (dev->flags & IFF_UP)) {
2501 struct in_ifaddr *ifa;
2502
2503 int flag = scope;
2504
2505 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2506 int plen;
2507
2508 addr.s6_addr32[3] = ifa->ifa_local;
2509
2510 if (ifa->ifa_scope == RT_SCOPE_LINK)
2511 continue;
2512 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2513 if (idev->dev->flags&IFF_POINTOPOINT)
2514 continue;
2515 flag |= IFA_HOST;
2516 }
2517 if (idev->dev->flags&IFF_POINTOPOINT)
2518 plen = 64;
2519 else
2520 plen = 96;
2521
2522 add_addr(idev, &addr, plen, flag);
2523 }
2524 }
2525 }
2526 }
2527 #endif
2528
2529 static void init_loopback(struct net_device *dev)
2530 {
2531 struct inet6_dev *idev;
2532
2533 /* ::1 */
2534
2535 ASSERT_RTNL();
2536
2537 if ((idev = ipv6_find_idev(dev)) == NULL) {
2538 pr_debug("%s: add_dev failed\n", __func__);
2539 return;
2540 }
2541
2542 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2543 }
2544
2545 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2546 {
2547 struct inet6_ifaddr *ifp;
2548 u32 addr_flags = IFA_F_PERMANENT;
2549
2550 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2551 if (idev->cnf.optimistic_dad &&
2552 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2553 addr_flags |= IFA_F_OPTIMISTIC;
2554 #endif
2555
2556
2557 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2558 if (!IS_ERR(ifp)) {
2559 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2560 addrconf_dad_start(ifp);
2561 in6_ifa_put(ifp);
2562 }
2563 }
2564
2565 static void addrconf_dev_config(struct net_device *dev)
2566 {
2567 struct in6_addr addr;
2568 struct inet6_dev *idev;
2569
2570 ASSERT_RTNL();
2571
2572 if ((dev->type != ARPHRD_ETHER) &&
2573 (dev->type != ARPHRD_FDDI) &&
2574 (dev->type != ARPHRD_ARCNET) &&
2575 (dev->type != ARPHRD_INFINIBAND) &&
2576 (dev->type != ARPHRD_IEEE802154)) {
2577 /* Alas, we support only Ethernet autoconfiguration. */
2578 return;
2579 }
2580
2581 idev = addrconf_add_dev(dev);
2582 if (IS_ERR(idev))
2583 return;
2584
2585 memset(&addr, 0, sizeof(struct in6_addr));
2586 addr.s6_addr32[0] = htonl(0xFE800000);
2587
2588 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2589 addrconf_add_linklocal(idev, &addr);
2590 }
2591
2592 #if IS_ENABLED(CONFIG_IPV6_SIT)
2593 static void addrconf_sit_config(struct net_device *dev)
2594 {
2595 struct inet6_dev *idev;
2596
2597 ASSERT_RTNL();
2598
2599 /*
2600 * Configure the tunnel with one of our IPv4
2601 * addresses... we should configure all of
2602 * our v4 addrs in the tunnel
2603 */
2604
2605 if ((idev = ipv6_find_idev(dev)) == NULL) {
2606 pr_debug("%s: add_dev failed\n", __func__);
2607 return;
2608 }
2609
2610 if (dev->priv_flags & IFF_ISATAP) {
2611 struct in6_addr addr;
2612
2613 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2614 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2615 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2616 addrconf_add_linklocal(idev, &addr);
2617 return;
2618 }
2619
2620 sit_add_v4_addrs(idev);
2621
2622 if (dev->flags&IFF_POINTOPOINT)
2623 addrconf_add_mroute(dev);
2624 else
2625 sit_route_add(dev);
2626 }
2627 #endif
2628
2629 #if IS_ENABLED(CONFIG_NET_IPGRE)
2630 static void addrconf_gre_config(struct net_device *dev)
2631 {
2632 struct inet6_dev *idev;
2633 struct in6_addr addr;
2634
2635 pr_info("%s(%s)\n", __func__, dev->name);
2636
2637 ASSERT_RTNL();
2638
2639 if ((idev = ipv6_find_idev(dev)) == NULL) {
2640 pr_debug("%s: add_dev failed\n", __func__);
2641 return;
2642 }
2643
2644 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2645 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2646
2647 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2648 addrconf_add_linklocal(idev, &addr);
2649 }
2650 #endif
2651
2652 static inline int
2653 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2654 {
2655 struct in6_addr lladdr;
2656
2657 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2658 addrconf_add_linklocal(idev, &lladdr);
2659 return 0;
2660 }
2661 return -1;
2662 }
2663
2664 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2665 {
2666 struct net_device *link_dev;
2667 struct net *net = dev_net(idev->dev);
2668
2669 /* first try to inherit the link-local address from the link device */
2670 if (idev->dev->iflink &&
2671 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2672 if (!ipv6_inherit_linklocal(idev, link_dev))
2673 return;
2674 }
2675 /* then try to inherit it from any device */
2676 for_each_netdev(net, link_dev) {
2677 if (!ipv6_inherit_linklocal(idev, link_dev))
2678 return;
2679 }
2680 pr_debug("init ip6-ip6: add_linklocal failed\n");
2681 }
2682
2683 /*
2684 * Autoconfigure tunnel with a link-local address so routing protocols,
2685 * DHCPv6, MLD etc. can be run over the virtual link
2686 */
2687
2688 static void addrconf_ip6_tnl_config(struct net_device *dev)
2689 {
2690 struct inet6_dev *idev;
2691
2692 ASSERT_RTNL();
2693
2694 idev = addrconf_add_dev(dev);
2695 if (IS_ERR(idev)) {
2696 pr_debug("init ip6-ip6: add_dev failed\n");
2697 return;
2698 }
2699 ip6_tnl_add_linklocal(idev);
2700 }
2701
2702 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2703 void *data)
2704 {
2705 struct net_device *dev = (struct net_device *) data;
2706 struct inet6_dev *idev = __in6_dev_get(dev);
2707 int run_pending = 0;
2708 int err;
2709
2710 switch (event) {
2711 case NETDEV_REGISTER:
2712 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2713 idev = ipv6_add_dev(dev);
2714 if (!idev)
2715 return notifier_from_errno(-ENOMEM);
2716 }
2717 break;
2718
2719 case NETDEV_UP:
2720 case NETDEV_CHANGE:
2721 if (dev->flags & IFF_SLAVE)
2722 break;
2723
2724 if (event == NETDEV_UP) {
2725 if (!addrconf_qdisc_ok(dev)) {
2726 /* device is not ready yet. */
2727 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2728 dev->name);
2729 break;
2730 }
2731
2732 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2733 idev = ipv6_add_dev(dev);
2734
2735 if (idev) {
2736 idev->if_flags |= IF_READY;
2737 run_pending = 1;
2738 }
2739 } else {
2740 if (!addrconf_qdisc_ok(dev)) {
2741 /* device is still not ready. */
2742 break;
2743 }
2744
2745 if (idev) {
2746 if (idev->if_flags & IF_READY)
2747 /* device is already configured. */
2748 break;
2749 idev->if_flags |= IF_READY;
2750 }
2751
2752 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2753 dev->name);
2754
2755 run_pending = 1;
2756 }
2757
2758 switch (dev->type) {
2759 #if IS_ENABLED(CONFIG_IPV6_SIT)
2760 case ARPHRD_SIT:
2761 addrconf_sit_config(dev);
2762 break;
2763 #endif
2764 #if IS_ENABLED(CONFIG_NET_IPGRE)
2765 case ARPHRD_IPGRE:
2766 addrconf_gre_config(dev);
2767 break;
2768 #endif
2769 case ARPHRD_TUNNEL6:
2770 addrconf_ip6_tnl_config(dev);
2771 break;
2772 case ARPHRD_LOOPBACK:
2773 init_loopback(dev);
2774 break;
2775
2776 default:
2777 addrconf_dev_config(dev);
2778 break;
2779 }
2780
2781 if (idev) {
2782 if (run_pending)
2783 addrconf_dad_run(idev);
2784
2785 /*
2786 * If the MTU changed during the interface down,
2787 * when the interface up, the changed MTU must be
2788 * reflected in the idev as well as routers.
2789 */
2790 if (idev->cnf.mtu6 != dev->mtu &&
2791 dev->mtu >= IPV6_MIN_MTU) {
2792 rt6_mtu_change(dev, dev->mtu);
2793 idev->cnf.mtu6 = dev->mtu;
2794 }
2795 idev->tstamp = jiffies;
2796 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2797
2798 /*
2799 * If the changed mtu during down is lower than
2800 * IPV6_MIN_MTU stop IPv6 on this interface.
2801 */
2802 if (dev->mtu < IPV6_MIN_MTU)
2803 addrconf_ifdown(dev, 1);
2804 }
2805 break;
2806
2807 case NETDEV_CHANGEMTU:
2808 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2809 rt6_mtu_change(dev, dev->mtu);
2810 idev->cnf.mtu6 = dev->mtu;
2811 break;
2812 }
2813
2814 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2815 idev = ipv6_add_dev(dev);
2816 if (idev)
2817 break;
2818 }
2819
2820 /*
2821 * MTU falled under IPV6_MIN_MTU.
2822 * Stop IPv6 on this interface.
2823 */
2824
2825 case NETDEV_DOWN:
2826 case NETDEV_UNREGISTER:
2827 /*
2828 * Remove all addresses from this interface.
2829 */
2830 addrconf_ifdown(dev, event != NETDEV_DOWN);
2831 break;
2832
2833 case NETDEV_CHANGENAME:
2834 if (idev) {
2835 snmp6_unregister_dev(idev);
2836 addrconf_sysctl_unregister(idev);
2837 addrconf_sysctl_register(idev);
2838 err = snmp6_register_dev(idev);
2839 if (err)
2840 return notifier_from_errno(err);
2841 }
2842 break;
2843
2844 case NETDEV_PRE_TYPE_CHANGE:
2845 case NETDEV_POST_TYPE_CHANGE:
2846 addrconf_type_change(dev, event);
2847 break;
2848 }
2849
2850 return NOTIFY_OK;
2851 }
2852
2853 /*
2854 * addrconf module should be notified of a device going up
2855 */
2856 static struct notifier_block ipv6_dev_notf = {
2857 .notifier_call = addrconf_notify,
2858 };
2859
2860 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2861 {
2862 struct inet6_dev *idev;
2863 ASSERT_RTNL();
2864
2865 idev = __in6_dev_get(dev);
2866
2867 if (event == NETDEV_POST_TYPE_CHANGE)
2868 ipv6_mc_remap(idev);
2869 else if (event == NETDEV_PRE_TYPE_CHANGE)
2870 ipv6_mc_unmap(idev);
2871 }
2872
2873 static int addrconf_ifdown(struct net_device *dev, int how)
2874 {
2875 struct net *net = dev_net(dev);
2876 struct inet6_dev *idev;
2877 struct inet6_ifaddr *ifa;
2878 int state, i;
2879
2880 ASSERT_RTNL();
2881
2882 rt6_ifdown(net, dev);
2883 neigh_ifdown(&nd_tbl, dev);
2884
2885 idev = __in6_dev_get(dev);
2886 if (idev == NULL)
2887 return -ENODEV;
2888
2889 /*
2890 * Step 1: remove reference to ipv6 device from parent device.
2891 * Do not dev_put!
2892 */
2893 if (how) {
2894 idev->dead = 1;
2895
2896 /* protected by rtnl_lock */
2897 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2898
2899 /* Step 1.5: remove snmp6 entry */
2900 snmp6_unregister_dev(idev);
2901
2902 }
2903
2904 /* Step 2: clear hash table */
2905 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2906 struct hlist_head *h = &inet6_addr_lst[i];
2907
2908 spin_lock_bh(&addrconf_hash_lock);
2909 restart:
2910 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2911 if (ifa->idev == idev) {
2912 hlist_del_init_rcu(&ifa->addr_lst);
2913 addrconf_del_timer(ifa);
2914 goto restart;
2915 }
2916 }
2917 spin_unlock_bh(&addrconf_hash_lock);
2918 }
2919
2920 write_lock_bh(&idev->lock);
2921
2922 /* Step 2: clear flags for stateless addrconf */
2923 if (!how)
2924 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2925
2926 #ifdef CONFIG_IPV6_PRIVACY
2927 if (how && del_timer(&idev->regen_timer))
2928 in6_dev_put(idev);
2929
2930 /* Step 3: clear tempaddr list */
2931 while (!list_empty(&idev->tempaddr_list)) {
2932 ifa = list_first_entry(&idev->tempaddr_list,
2933 struct inet6_ifaddr, tmp_list);
2934 list_del(&ifa->tmp_list);
2935 write_unlock_bh(&idev->lock);
2936 spin_lock_bh(&ifa->lock);
2937
2938 if (ifa->ifpub) {
2939 in6_ifa_put(ifa->ifpub);
2940 ifa->ifpub = NULL;
2941 }
2942 spin_unlock_bh(&ifa->lock);
2943 in6_ifa_put(ifa);
2944 write_lock_bh(&idev->lock);
2945 }
2946 #endif
2947
2948 while (!list_empty(&idev->addr_list)) {
2949 ifa = list_first_entry(&idev->addr_list,
2950 struct inet6_ifaddr, if_list);
2951 addrconf_del_timer(ifa);
2952
2953 list_del(&ifa->if_list);
2954
2955 write_unlock_bh(&idev->lock);
2956
2957 spin_lock_bh(&ifa->state_lock);
2958 state = ifa->state;
2959 ifa->state = INET6_IFADDR_STATE_DEAD;
2960 spin_unlock_bh(&ifa->state_lock);
2961
2962 if (state != INET6_IFADDR_STATE_DEAD) {
2963 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2964 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2965 }
2966 in6_ifa_put(ifa);
2967
2968 write_lock_bh(&idev->lock);
2969 }
2970
2971 write_unlock_bh(&idev->lock);
2972
2973 /* Step 5: Discard multicast list */
2974 if (how)
2975 ipv6_mc_destroy_dev(idev);
2976 else
2977 ipv6_mc_down(idev);
2978
2979 idev->tstamp = jiffies;
2980
2981 /* Last: Shot the device (if unregistered) */
2982 if (how) {
2983 addrconf_sysctl_unregister(idev);
2984 neigh_parms_release(&nd_tbl, idev->nd_parms);
2985 neigh_ifdown(&nd_tbl, dev);
2986 in6_dev_put(idev);
2987 }
2988 return 0;
2989 }
2990
2991 static void addrconf_rs_timer(unsigned long data)
2992 {
2993 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2994 struct inet6_dev *idev = ifp->idev;
2995
2996 read_lock(&idev->lock);
2997 if (idev->dead || !(idev->if_flags & IF_READY))
2998 goto out;
2999
3000 if (!ipv6_accept_ra(idev))
3001 goto out;
3002
3003 /* Announcement received after solicitation was sent */
3004 if (idev->if_flags & IF_RA_RCVD)
3005 goto out;
3006
3007 spin_lock(&ifp->lock);
3008 if (ifp->probes++ < idev->cnf.rtr_solicits) {
3009 /* The wait after the last probe can be shorter */
3010 addrconf_mod_timer(ifp, AC_RS,
3011 (ifp->probes == idev->cnf.rtr_solicits) ?
3012 idev->cnf.rtr_solicit_delay :
3013 idev->cnf.rtr_solicit_interval);
3014 spin_unlock(&ifp->lock);
3015
3016 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3017 } else {
3018 spin_unlock(&ifp->lock);
3019 /*
3020 * Note: we do not support deprecated "all on-link"
3021 * assumption any longer.
3022 */
3023 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3024 }
3025
3026 out:
3027 read_unlock(&idev->lock);
3028 in6_ifa_put(ifp);
3029 }
3030
3031 /*
3032 * Duplicate Address Detection
3033 */
3034 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3035 {
3036 unsigned long rand_num;
3037 struct inet6_dev *idev = ifp->idev;
3038
3039 if (ifp->flags & IFA_F_OPTIMISTIC)
3040 rand_num = 0;
3041 else
3042 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3043
3044 ifp->probes = idev->cnf.dad_transmits;
3045 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3046 }
3047
3048 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3049 {
3050 struct inet6_dev *idev = ifp->idev;
3051 struct net_device *dev = idev->dev;
3052
3053 addrconf_join_solict(dev, &ifp->addr);
3054
3055 net_srandom(ifp->addr.s6_addr32[3]);
3056
3057 read_lock_bh(&idev->lock);
3058 spin_lock(&ifp->lock);
3059 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3060 goto out;
3061
3062 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3063 idev->cnf.accept_dad < 1 ||
3064 !(ifp->flags&IFA_F_TENTATIVE) ||
3065 ifp->flags & IFA_F_NODAD) {
3066 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3067 spin_unlock(&ifp->lock);
3068 read_unlock_bh(&idev->lock);
3069
3070 addrconf_dad_completed(ifp);
3071 return;
3072 }
3073
3074 if (!(idev->if_flags & IF_READY)) {
3075 spin_unlock(&ifp->lock);
3076 read_unlock_bh(&idev->lock);
3077 /*
3078 * If the device is not ready:
3079 * - keep it tentative if it is a permanent address.
3080 * - otherwise, kill it.
3081 */
3082 in6_ifa_hold(ifp);
3083 addrconf_dad_stop(ifp, 0);
3084 return;
3085 }
3086
3087 /*
3088 * Optimistic nodes can start receiving
3089 * Frames right away
3090 */
3091 if (ifp->flags & IFA_F_OPTIMISTIC)
3092 ip6_ins_rt(ifp->rt);
3093
3094 addrconf_dad_kick(ifp);
3095 out:
3096 spin_unlock(&ifp->lock);
3097 read_unlock_bh(&idev->lock);
3098 }
3099
3100 static void addrconf_dad_timer(unsigned long data)
3101 {
3102 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3103 struct inet6_dev *idev = ifp->idev;
3104 struct in6_addr mcaddr;
3105
3106 if (!ifp->probes && addrconf_dad_end(ifp))
3107 goto out;
3108
3109 read_lock(&idev->lock);
3110 if (idev->dead || !(idev->if_flags & IF_READY)) {
3111 read_unlock(&idev->lock);
3112 goto out;
3113 }
3114
3115 spin_lock(&ifp->lock);
3116 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3117 spin_unlock(&ifp->lock);
3118 read_unlock(&idev->lock);
3119 goto out;
3120 }
3121
3122 if (ifp->probes == 0) {
3123 /*
3124 * DAD was successful
3125 */
3126
3127 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3128 spin_unlock(&ifp->lock);
3129 read_unlock(&idev->lock);
3130
3131 addrconf_dad_completed(ifp);
3132
3133 goto out;
3134 }
3135
3136 ifp->probes--;
3137 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3138 spin_unlock(&ifp->lock);
3139 read_unlock(&idev->lock);
3140
3141 /* send a neighbour solicitation for our addr */
3142 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3143 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3144 out:
3145 in6_ifa_put(ifp);
3146 }
3147
3148 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3149 {
3150 struct net_device *dev = ifp->idev->dev;
3151
3152 /*
3153 * Configure the address for reception. Now it is valid.
3154 */
3155
3156 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3157
3158 /* If added prefix is link local and we are prepared to process
3159 router advertisements, start sending router solicitations.
3160 */
3161
3162 if (ipv6_accept_ra(ifp->idev) &&
3163 ifp->idev->cnf.rtr_solicits > 0 &&
3164 (dev->flags&IFF_LOOPBACK) == 0 &&
3165 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3166 /*
3167 * If a host as already performed a random delay
3168 * [...] as part of DAD [...] there is no need
3169 * to delay again before sending the first RS
3170 */
3171 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3172
3173 spin_lock_bh(&ifp->lock);
3174 ifp->probes = 1;
3175 ifp->idev->if_flags |= IF_RS_SENT;
3176 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3177 spin_unlock_bh(&ifp->lock);
3178 }
3179 }
3180
3181 static void addrconf_dad_run(struct inet6_dev *idev)
3182 {
3183 struct inet6_ifaddr *ifp;
3184
3185 read_lock_bh(&idev->lock);
3186 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3187 spin_lock(&ifp->lock);
3188 if (ifp->flags & IFA_F_TENTATIVE &&
3189 ifp->state == INET6_IFADDR_STATE_DAD)
3190 addrconf_dad_kick(ifp);
3191 spin_unlock(&ifp->lock);
3192 }
3193 read_unlock_bh(&idev->lock);
3194 }
3195
3196 #ifdef CONFIG_PROC_FS
3197 struct if6_iter_state {
3198 struct seq_net_private p;
3199 int bucket;
3200 int offset;
3201 };
3202
3203 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3204 {
3205 struct inet6_ifaddr *ifa = NULL;
3206 struct if6_iter_state *state = seq->private;
3207 struct net *net = seq_file_net(seq);
3208 int p = 0;
3209
3210 /* initial bucket if pos is 0 */
3211 if (pos == 0) {
3212 state->bucket = 0;
3213 state->offset = 0;
3214 }
3215
3216 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3217 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3218 addr_lst) {
3219 if (!net_eq(dev_net(ifa->idev->dev), net))
3220 continue;
3221 /* sync with offset */
3222 if (p < state->offset) {
3223 p++;
3224 continue;
3225 }
3226 state->offset++;
3227 return ifa;
3228 }
3229
3230 /* prepare for next bucket */
3231 state->offset = 0;
3232 p = 0;
3233 }
3234 return NULL;
3235 }
3236
3237 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3238 struct inet6_ifaddr *ifa)
3239 {
3240 struct if6_iter_state *state = seq->private;
3241 struct net *net = seq_file_net(seq);
3242
3243 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3244 if (!net_eq(dev_net(ifa->idev->dev), net))
3245 continue;
3246 state->offset++;
3247 return ifa;
3248 }
3249
3250 while (++state->bucket < IN6_ADDR_HSIZE) {
3251 state->offset = 0;
3252 hlist_for_each_entry_rcu_bh(ifa,
3253 &inet6_addr_lst[state->bucket], addr_lst) {
3254 if (!net_eq(dev_net(ifa->idev->dev), net))
3255 continue;
3256 state->offset++;
3257 return ifa;
3258 }
3259 }
3260
3261 return NULL;
3262 }
3263
3264 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3265 __acquires(rcu_bh)
3266 {
3267 rcu_read_lock_bh();
3268 return if6_get_first(seq, *pos);
3269 }
3270
3271 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3272 {
3273 struct inet6_ifaddr *ifa;
3274
3275 ifa = if6_get_next(seq, v);
3276 ++*pos;
3277 return ifa;
3278 }
3279
3280 static void if6_seq_stop(struct seq_file *seq, void *v)
3281 __releases(rcu_bh)
3282 {
3283 rcu_read_unlock_bh();
3284 }
3285
3286 static int if6_seq_show(struct seq_file *seq, void *v)
3287 {
3288 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3289 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3290 &ifp->addr,
3291 ifp->idev->dev->ifindex,
3292 ifp->prefix_len,
3293 ifp->scope,
3294 ifp->flags,
3295 ifp->idev->dev->name);
3296 return 0;
3297 }
3298
3299 static const struct seq_operations if6_seq_ops = {
3300 .start = if6_seq_start,
3301 .next = if6_seq_next,
3302 .show = if6_seq_show,
3303 .stop = if6_seq_stop,
3304 };
3305
3306 static int if6_seq_open(struct inode *inode, struct file *file)
3307 {
3308 return seq_open_net(inode, file, &if6_seq_ops,
3309 sizeof(struct if6_iter_state));
3310 }
3311
3312 static const struct file_operations if6_fops = {
3313 .owner = THIS_MODULE,
3314 .open = if6_seq_open,
3315 .read = seq_read,
3316 .llseek = seq_lseek,
3317 .release = seq_release_net,
3318 };
3319
3320 static int __net_init if6_proc_net_init(struct net *net)
3321 {
3322 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3323 return -ENOMEM;
3324 return 0;
3325 }
3326
3327 static void __net_exit if6_proc_net_exit(struct net *net)
3328 {
3329 remove_proc_entry("if_inet6", net->proc_net);
3330 }
3331
3332 static struct pernet_operations if6_proc_net_ops = {
3333 .init = if6_proc_net_init,
3334 .exit = if6_proc_net_exit,
3335 };
3336
3337 int __init if6_proc_init(void)
3338 {
3339 return register_pernet_subsys(&if6_proc_net_ops);
3340 }
3341
3342 void if6_proc_exit(void)
3343 {
3344 unregister_pernet_subsys(&if6_proc_net_ops);
3345 }
3346 #endif /* CONFIG_PROC_FS */
3347
3348 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3349 /* Check if address is a home address configured on any interface. */
3350 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3351 {
3352 int ret = 0;
3353 struct inet6_ifaddr *ifp = NULL;
3354 unsigned int hash = inet6_addr_hash(addr);
3355
3356 rcu_read_lock_bh();
3357 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3358 if (!net_eq(dev_net(ifp->idev->dev), net))
3359 continue;
3360 if (ipv6_addr_equal(&ifp->addr, addr) &&
3361 (ifp->flags & IFA_F_HOMEADDRESS)) {
3362 ret = 1;
3363 break;
3364 }
3365 }
3366 rcu_read_unlock_bh();
3367 return ret;
3368 }
3369 #endif
3370
3371 /*
3372 * Periodic address status verification
3373 */
3374
3375 static void addrconf_verify(unsigned long foo)
3376 {
3377 unsigned long now, next, next_sec, next_sched;
3378 struct inet6_ifaddr *ifp;
3379 int i;
3380
3381 rcu_read_lock_bh();
3382 spin_lock(&addrconf_verify_lock);
3383 now = jiffies;
3384 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3385
3386 del_timer(&addr_chk_timer);
3387
3388 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3389 restart:
3390 hlist_for_each_entry_rcu_bh(ifp,
3391 &inet6_addr_lst[i], addr_lst) {
3392 unsigned long age;
3393
3394 if (ifp->flags & IFA_F_PERMANENT)
3395 continue;
3396
3397 spin_lock(&ifp->lock);
3398 /* We try to batch several events at once. */
3399 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3400
3401 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3402 age >= ifp->valid_lft) {
3403 spin_unlock(&ifp->lock);
3404 in6_ifa_hold(ifp);
3405 ipv6_del_addr(ifp);
3406 goto restart;
3407 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3408 spin_unlock(&ifp->lock);
3409 continue;
3410 } else if (age >= ifp->prefered_lft) {
3411 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3412 int deprecate = 0;
3413
3414 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3415 deprecate = 1;
3416 ifp->flags |= IFA_F_DEPRECATED;
3417 }
3418
3419 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3420 next = ifp->tstamp + ifp->valid_lft * HZ;
3421
3422 spin_unlock(&ifp->lock);
3423
3424 if (deprecate) {
3425 in6_ifa_hold(ifp);
3426
3427 ipv6_ifa_notify(0, ifp);
3428 in6_ifa_put(ifp);
3429 goto restart;
3430 }
3431 #ifdef CONFIG_IPV6_PRIVACY
3432 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3433 !(ifp->flags&IFA_F_TENTATIVE)) {
3434 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3435 ifp->idev->cnf.dad_transmits *
3436 ifp->idev->nd_parms->retrans_time / HZ;
3437
3438 if (age >= ifp->prefered_lft - regen_advance) {
3439 struct inet6_ifaddr *ifpub = ifp->ifpub;
3440 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3441 next = ifp->tstamp + ifp->prefered_lft * HZ;
3442 if (!ifp->regen_count && ifpub) {
3443 ifp->regen_count++;
3444 in6_ifa_hold(ifp);
3445 in6_ifa_hold(ifpub);
3446 spin_unlock(&ifp->lock);
3447
3448 spin_lock(&ifpub->lock);
3449 ifpub->regen_count = 0;
3450 spin_unlock(&ifpub->lock);
3451 ipv6_create_tempaddr(ifpub, ifp);
3452 in6_ifa_put(ifpub);
3453 in6_ifa_put(ifp);
3454 goto restart;
3455 }
3456 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3457 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3458 spin_unlock(&ifp->lock);
3459 #endif
3460 } else {
3461 /* ifp->prefered_lft <= ifp->valid_lft */
3462 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3463 next = ifp->tstamp + ifp->prefered_lft * HZ;
3464 spin_unlock(&ifp->lock);
3465 }
3466 }
3467 }
3468
3469 next_sec = round_jiffies_up(next);
3470 next_sched = next;
3471
3472 /* If rounded timeout is accurate enough, accept it. */
3473 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3474 next_sched = next_sec;
3475
3476 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3477 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3478 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3479
3480 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3481 now, next, next_sec, next_sched));
3482
3483 addr_chk_timer.expires = next_sched;
3484 add_timer(&addr_chk_timer);
3485 spin_unlock(&addrconf_verify_lock);
3486 rcu_read_unlock_bh();
3487 }
3488
3489 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3490 {
3491 struct in6_addr *pfx = NULL;
3492
3493 if (addr)
3494 pfx = nla_data(addr);
3495
3496 if (local) {
3497 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3498 pfx = NULL;
3499 else
3500 pfx = nla_data(local);
3501 }
3502
3503 return pfx;
3504 }
3505
3506 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3507 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3508 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3509 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3510 };
3511
3512 static int
3513 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3514 {
3515 struct net *net = sock_net(skb->sk);
3516 struct ifaddrmsg *ifm;
3517 struct nlattr *tb[IFA_MAX+1];
3518 struct in6_addr *pfx;
3519 int err;
3520
3521 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3522 if (err < 0)
3523 return err;
3524
3525 ifm = nlmsg_data(nlh);
3526 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3527 if (pfx == NULL)
3528 return -EINVAL;
3529
3530 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3531 }
3532
3533 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3534 u32 prefered_lft, u32 valid_lft)
3535 {
3536 u32 flags;
3537 clock_t expires;
3538 unsigned long timeout;
3539
3540 if (!valid_lft || (prefered_lft > valid_lft))
3541 return -EINVAL;
3542
3543 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3544 if (addrconf_finite_timeout(timeout)) {
3545 expires = jiffies_to_clock_t(timeout * HZ);
3546 valid_lft = timeout;
3547 flags = RTF_EXPIRES;
3548 } else {
3549 expires = 0;
3550 flags = 0;
3551 ifa_flags |= IFA_F_PERMANENT;
3552 }
3553
3554 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3555 if (addrconf_finite_timeout(timeout)) {
3556 if (timeout == 0)
3557 ifa_flags |= IFA_F_DEPRECATED;
3558 prefered_lft = timeout;
3559 }
3560
3561 spin_lock_bh(&ifp->lock);
3562 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3563 ifp->tstamp = jiffies;
3564 ifp->valid_lft = valid_lft;
3565 ifp->prefered_lft = prefered_lft;
3566
3567 spin_unlock_bh(&ifp->lock);
3568 if (!(ifp->flags&IFA_F_TENTATIVE))
3569 ipv6_ifa_notify(0, ifp);
3570
3571 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3572 expires, flags);
3573 addrconf_verify(0);
3574
3575 return 0;
3576 }
3577
3578 static int
3579 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3580 {
3581 struct net *net = sock_net(skb->sk);
3582 struct ifaddrmsg *ifm;
3583 struct nlattr *tb[IFA_MAX+1];
3584 struct in6_addr *pfx;
3585 struct inet6_ifaddr *ifa;
3586 struct net_device *dev;
3587 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3588 u8 ifa_flags;
3589 int err;
3590
3591 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3592 if (err < 0)
3593 return err;
3594
3595 ifm = nlmsg_data(nlh);
3596 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3597 if (pfx == NULL)
3598 return -EINVAL;
3599
3600 if (tb[IFA_CACHEINFO]) {
3601 struct ifa_cacheinfo *ci;
3602
3603 ci = nla_data(tb[IFA_CACHEINFO]);
3604 valid_lft = ci->ifa_valid;
3605 preferred_lft = ci->ifa_prefered;
3606 } else {
3607 preferred_lft = INFINITY_LIFE_TIME;
3608 valid_lft = INFINITY_LIFE_TIME;
3609 }
3610
3611 dev = __dev_get_by_index(net, ifm->ifa_index);
3612 if (dev == NULL)
3613 return -ENODEV;
3614
3615 /* We ignore other flags so far. */
3616 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3617
3618 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3619 if (ifa == NULL) {
3620 /*
3621 * It would be best to check for !NLM_F_CREATE here but
3622 * userspace alreay relies on not having to provide this.
3623 */
3624 return inet6_addr_add(net, ifm->ifa_index, pfx,
3625 ifm->ifa_prefixlen, ifa_flags,
3626 preferred_lft, valid_lft);
3627 }
3628
3629 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3630 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3631 err = -EEXIST;
3632 else
3633 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3634
3635 in6_ifa_put(ifa);
3636
3637 return err;
3638 }
3639
3640 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3641 u8 scope, int ifindex)
3642 {
3643 struct ifaddrmsg *ifm;
3644
3645 ifm = nlmsg_data(nlh);
3646 ifm->ifa_family = AF_INET6;
3647 ifm->ifa_prefixlen = prefixlen;
3648 ifm->ifa_flags = flags;
3649 ifm->ifa_scope = scope;
3650 ifm->ifa_index = ifindex;
3651 }
3652
3653 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3654 unsigned long tstamp, u32 preferred, u32 valid)
3655 {
3656 struct ifa_cacheinfo ci;
3657
3658 ci.cstamp = cstamp_delta(cstamp);
3659 ci.tstamp = cstamp_delta(tstamp);
3660 ci.ifa_prefered = preferred;
3661 ci.ifa_valid = valid;
3662
3663 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3664 }
3665
3666 static inline int rt_scope(int ifa_scope)
3667 {
3668 if (ifa_scope & IFA_HOST)
3669 return RT_SCOPE_HOST;
3670 else if (ifa_scope & IFA_LINK)
3671 return RT_SCOPE_LINK;
3672 else if (ifa_scope & IFA_SITE)
3673 return RT_SCOPE_SITE;
3674 else
3675 return RT_SCOPE_UNIVERSE;
3676 }
3677
3678 static inline int inet6_ifaddr_msgsize(void)
3679 {
3680 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3681 + nla_total_size(16) /* IFA_ADDRESS */
3682 + nla_total_size(sizeof(struct ifa_cacheinfo));
3683 }
3684
3685 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3686 u32 portid, u32 seq, int event, unsigned int flags)
3687 {
3688 struct nlmsghdr *nlh;
3689 u32 preferred, valid;
3690
3691 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3692 if (nlh == NULL)
3693 return -EMSGSIZE;
3694
3695 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3696 ifa->idev->dev->ifindex);
3697
3698 if (!(ifa->flags&IFA_F_PERMANENT)) {
3699 preferred = ifa->prefered_lft;
3700 valid = ifa->valid_lft;
3701 if (preferred != INFINITY_LIFE_TIME) {
3702 long tval = (jiffies - ifa->tstamp)/HZ;
3703 if (preferred > tval)
3704 preferred -= tval;
3705 else
3706 preferred = 0;
3707 if (valid != INFINITY_LIFE_TIME) {
3708 if (valid > tval)
3709 valid -= tval;
3710 else
3711 valid = 0;
3712 }
3713 }
3714 } else {
3715 preferred = INFINITY_LIFE_TIME;
3716 valid = INFINITY_LIFE_TIME;
3717 }
3718
3719 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3720 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3721 nlmsg_cancel(skb, nlh);
3722 return -EMSGSIZE;
3723 }
3724
3725 return nlmsg_end(skb, nlh);
3726 }
3727
3728 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3729 u32 portid, u32 seq, int event, u16 flags)
3730 {
3731 struct nlmsghdr *nlh;
3732 u8 scope = RT_SCOPE_UNIVERSE;
3733 int ifindex = ifmca->idev->dev->ifindex;
3734
3735 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3736 scope = RT_SCOPE_SITE;
3737
3738 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3739 if (nlh == NULL)
3740 return -EMSGSIZE;
3741
3742 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3743 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3744 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3745 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3746 nlmsg_cancel(skb, nlh);
3747 return -EMSGSIZE;
3748 }
3749
3750 return nlmsg_end(skb, nlh);
3751 }
3752
3753 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3754 u32 portid, u32 seq, int event, unsigned int flags)
3755 {
3756 struct nlmsghdr *nlh;
3757 u8 scope = RT_SCOPE_UNIVERSE;
3758 int ifindex = ifaca->aca_idev->dev->ifindex;
3759
3760 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3761 scope = RT_SCOPE_SITE;
3762
3763 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3764 if (nlh == NULL)
3765 return -EMSGSIZE;
3766
3767 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3768 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3769 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3770 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3771 nlmsg_cancel(skb, nlh);
3772 return -EMSGSIZE;
3773 }
3774
3775 return nlmsg_end(skb, nlh);
3776 }
3777
3778 enum addr_type_t {
3779 UNICAST_ADDR,
3780 MULTICAST_ADDR,
3781 ANYCAST_ADDR,
3782 };
3783
3784 /* called with rcu_read_lock() */
3785 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3786 struct netlink_callback *cb, enum addr_type_t type,
3787 int s_ip_idx, int *p_ip_idx)
3788 {
3789 struct ifmcaddr6 *ifmca;
3790 struct ifacaddr6 *ifaca;
3791 int err = 1;
3792 int ip_idx = *p_ip_idx;
3793
3794 read_lock_bh(&idev->lock);
3795 switch (type) {
3796 case UNICAST_ADDR: {
3797 struct inet6_ifaddr *ifa;
3798
3799 /* unicast address incl. temp addr */
3800 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3801 if (++ip_idx < s_ip_idx)
3802 continue;
3803 err = inet6_fill_ifaddr(skb, ifa,
3804 NETLINK_CB(cb->skb).portid,
3805 cb->nlh->nlmsg_seq,
3806 RTM_NEWADDR,
3807 NLM_F_MULTI);
3808 if (err <= 0)
3809 break;
3810 }
3811 break;
3812 }
3813 case MULTICAST_ADDR:
3814 /* multicast address */
3815 for (ifmca = idev->mc_list; ifmca;
3816 ifmca = ifmca->next, ip_idx++) {
3817 if (ip_idx < s_ip_idx)
3818 continue;
3819 err = inet6_fill_ifmcaddr(skb, ifmca,
3820 NETLINK_CB(cb->skb).portid,
3821 cb->nlh->nlmsg_seq,
3822 RTM_GETMULTICAST,
3823 NLM_F_MULTI);
3824 if (err <= 0)
3825 break;
3826 }
3827 break;
3828 case ANYCAST_ADDR:
3829 /* anycast address */
3830 for (ifaca = idev->ac_list; ifaca;
3831 ifaca = ifaca->aca_next, ip_idx++) {
3832 if (ip_idx < s_ip_idx)
3833 continue;
3834 err = inet6_fill_ifacaddr(skb, ifaca,
3835 NETLINK_CB(cb->skb).portid,
3836 cb->nlh->nlmsg_seq,
3837 RTM_GETANYCAST,
3838 NLM_F_MULTI);
3839 if (err <= 0)
3840 break;
3841 }
3842 break;
3843 default:
3844 break;
3845 }
3846 read_unlock_bh(&idev->lock);
3847 *p_ip_idx = ip_idx;
3848 return err;
3849 }
3850
3851 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3852 enum addr_type_t type)
3853 {
3854 struct net *net = sock_net(skb->sk);
3855 int h, s_h;
3856 int idx, ip_idx;
3857 int s_idx, s_ip_idx;
3858 struct net_device *dev;
3859 struct inet6_dev *idev;
3860 struct hlist_head *head;
3861
3862 s_h = cb->args[0];
3863 s_idx = idx = cb->args[1];
3864 s_ip_idx = ip_idx = cb->args[2];
3865
3866 rcu_read_lock();
3867 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3868 idx = 0;
3869 head = &net->dev_index_head[h];
3870 hlist_for_each_entry_rcu(dev, head, index_hlist) {
3871 if (idx < s_idx)
3872 goto cont;
3873 if (h > s_h || idx > s_idx)
3874 s_ip_idx = 0;
3875 ip_idx = 0;
3876 idev = __in6_dev_get(dev);
3877 if (!idev)
3878 goto cont;
3879
3880 if (in6_dump_addrs(idev, skb, cb, type,
3881 s_ip_idx, &ip_idx) <= 0)
3882 goto done;
3883 cont:
3884 idx++;
3885 }
3886 }
3887 done:
3888 rcu_read_unlock();
3889 cb->args[0] = h;
3890 cb->args[1] = idx;
3891 cb->args[2] = ip_idx;
3892
3893 return skb->len;
3894 }
3895
3896 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3897 {
3898 enum addr_type_t type = UNICAST_ADDR;
3899
3900 return inet6_dump_addr(skb, cb, type);
3901 }
3902
3903 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3904 {
3905 enum addr_type_t type = MULTICAST_ADDR;
3906
3907 return inet6_dump_addr(skb, cb, type);
3908 }
3909
3910
3911 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3912 {
3913 enum addr_type_t type = ANYCAST_ADDR;
3914
3915 return inet6_dump_addr(skb, cb, type);
3916 }
3917
3918 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3919 void *arg)
3920 {
3921 struct net *net = sock_net(in_skb->sk);
3922 struct ifaddrmsg *ifm;
3923 struct nlattr *tb[IFA_MAX+1];
3924 struct in6_addr *addr = NULL;
3925 struct net_device *dev = NULL;
3926 struct inet6_ifaddr *ifa;
3927 struct sk_buff *skb;
3928 int err;
3929
3930 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3931 if (err < 0)
3932 goto errout;
3933
3934 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3935 if (addr == NULL) {
3936 err = -EINVAL;
3937 goto errout;
3938 }
3939
3940 ifm = nlmsg_data(nlh);
3941 if (ifm->ifa_index)
3942 dev = __dev_get_by_index(net, ifm->ifa_index);
3943
3944 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3945 if (!ifa) {
3946 err = -EADDRNOTAVAIL;
3947 goto errout;
3948 }
3949
3950 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3951 if (!skb) {
3952 err = -ENOBUFS;
3953 goto errout_ifa;
3954 }
3955
3956 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
3957 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3958 if (err < 0) {
3959 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3960 WARN_ON(err == -EMSGSIZE);
3961 kfree_skb(skb);
3962 goto errout_ifa;
3963 }
3964 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3965 errout_ifa:
3966 in6_ifa_put(ifa);
3967 errout:
3968 return err;
3969 }
3970
3971 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3972 {
3973 struct sk_buff *skb;
3974 struct net *net = dev_net(ifa->idev->dev);
3975 int err = -ENOBUFS;
3976
3977 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3978 if (skb == NULL)
3979 goto errout;
3980
3981 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3982 if (err < 0) {
3983 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3984 WARN_ON(err == -EMSGSIZE);
3985 kfree_skb(skb);
3986 goto errout;
3987 }
3988 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3989 return;
3990 errout:
3991 if (err < 0)
3992 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3993 }
3994
3995 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3996 __s32 *array, int bytes)
3997 {
3998 BUG_ON(bytes < (DEVCONF_MAX * 4));
3999
4000 memset(array, 0, bytes);
4001 array[DEVCONF_FORWARDING] = cnf->forwarding;
4002 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4003 array[DEVCONF_MTU6] = cnf->mtu6;
4004 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4005 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4006 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4007 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4008 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4009 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4010 jiffies_to_msecs(cnf->rtr_solicit_interval);
4011 array[DEVCONF_RTR_SOLICIT_DELAY] =
4012 jiffies_to_msecs(cnf->rtr_solicit_delay);
4013 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4014 #ifdef CONFIG_IPV6_PRIVACY
4015 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4016 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4017 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4018 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4019 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4020 #endif
4021 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4022 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4023 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4024 #ifdef CONFIG_IPV6_ROUTER_PREF
4025 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4026 array[DEVCONF_RTR_PROBE_INTERVAL] =
4027 jiffies_to_msecs(cnf->rtr_probe_interval);
4028 #ifdef CONFIG_IPV6_ROUTE_INFO
4029 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4030 #endif
4031 #endif
4032 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4033 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4034 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4035 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4036 #endif
4037 #ifdef CONFIG_IPV6_MROUTE
4038 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4039 #endif
4040 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4041 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4042 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4043 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4044 }
4045
4046 static inline size_t inet6_ifla6_size(void)
4047 {
4048 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4049 + nla_total_size(sizeof(struct ifla_cacheinfo))
4050 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4051 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4052 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
4053 }
4054
4055 static inline size_t inet6_if_nlmsg_size(void)
4056 {
4057 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4058 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4059 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4060 + nla_total_size(4) /* IFLA_MTU */
4061 + nla_total_size(4) /* IFLA_LINK */
4062 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4063 }
4064
4065 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4066 int items, int bytes)
4067 {
4068 int i;
4069 int pad = bytes - sizeof(u64) * items;
4070 BUG_ON(pad < 0);
4071
4072 /* Use put_unaligned() because stats may not be aligned for u64. */
4073 put_unaligned(items, &stats[0]);
4074 for (i = 1; i < items; i++)
4075 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4076
4077 memset(&stats[items], 0, pad);
4078 }
4079
4080 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4081 int items, int bytes, size_t syncpoff)
4082 {
4083 int i;
4084 int pad = bytes - sizeof(u64) * items;
4085 BUG_ON(pad < 0);
4086
4087 /* Use put_unaligned() because stats may not be aligned for u64. */
4088 put_unaligned(items, &stats[0]);
4089 for (i = 1; i < items; i++)
4090 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4091
4092 memset(&stats[items], 0, pad);
4093 }
4094
4095 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4096 int bytes)
4097 {
4098 switch (attrtype) {
4099 case IFLA_INET6_STATS:
4100 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4101 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4102 break;
4103 case IFLA_INET6_ICMP6STATS:
4104 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4105 break;
4106 }
4107 }
4108
4109 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4110 {
4111 struct nlattr *nla;
4112 struct ifla_cacheinfo ci;
4113
4114 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4115 goto nla_put_failure;
4116 ci.max_reasm_len = IPV6_MAXPLEN;
4117 ci.tstamp = cstamp_delta(idev->tstamp);
4118 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4119 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4120 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4121 goto nla_put_failure;
4122 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4123 if (nla == NULL)
4124 goto nla_put_failure;
4125 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4126
4127 /* XXX - MC not implemented */
4128
4129 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4130 if (nla == NULL)
4131 goto nla_put_failure;
4132 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4133
4134 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4135 if (nla == NULL)
4136 goto nla_put_failure;
4137 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4138
4139 return 0;
4140
4141 nla_put_failure:
4142 return -EMSGSIZE;
4143 }
4144
4145 static size_t inet6_get_link_af_size(const struct net_device *dev)
4146 {
4147 if (!__in6_dev_get(dev))
4148 return 0;
4149
4150 return inet6_ifla6_size();
4151 }
4152
4153 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4154 {
4155 struct inet6_dev *idev = __in6_dev_get(dev);
4156
4157 if (!idev)
4158 return -ENODATA;
4159
4160 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4161 return -EMSGSIZE;
4162
4163 return 0;
4164 }
4165
4166 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4167 u32 portid, u32 seq, int event, unsigned int flags)
4168 {
4169 struct net_device *dev = idev->dev;
4170 struct ifinfomsg *hdr;
4171 struct nlmsghdr *nlh;
4172 void *protoinfo;
4173
4174 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4175 if (nlh == NULL)
4176 return -EMSGSIZE;
4177
4178 hdr = nlmsg_data(nlh);
4179 hdr->ifi_family = AF_INET6;
4180 hdr->__ifi_pad = 0;
4181 hdr->ifi_type = dev->type;
4182 hdr->ifi_index = dev->ifindex;
4183 hdr->ifi_flags = dev_get_flags(dev);
4184 hdr->ifi_change = 0;
4185
4186 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4187 (dev->addr_len &&
4188 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4189 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4190 (dev->ifindex != dev->iflink &&
4191 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4192 goto nla_put_failure;
4193 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4194 if (protoinfo == NULL)
4195 goto nla_put_failure;
4196
4197 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4198 goto nla_put_failure;
4199
4200 nla_nest_end(skb, protoinfo);
4201 return nlmsg_end(skb, nlh);
4202
4203 nla_put_failure:
4204 nlmsg_cancel(skb, nlh);
4205 return -EMSGSIZE;
4206 }
4207
4208 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4209 {
4210 struct net *net = sock_net(skb->sk);
4211 int h, s_h;
4212 int idx = 0, s_idx;
4213 struct net_device *dev;
4214 struct inet6_dev *idev;
4215 struct hlist_head *head;
4216
4217 s_h = cb->args[0];
4218 s_idx = cb->args[1];
4219
4220 rcu_read_lock();
4221 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4222 idx = 0;
4223 head = &net->dev_index_head[h];
4224 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4225 if (idx < s_idx)
4226 goto cont;
4227 idev = __in6_dev_get(dev);
4228 if (!idev)
4229 goto cont;
4230 if (inet6_fill_ifinfo(skb, idev,
4231 NETLINK_CB(cb->skb).portid,
4232 cb->nlh->nlmsg_seq,
4233 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4234 goto out;
4235 cont:
4236 idx++;
4237 }
4238 }
4239 out:
4240 rcu_read_unlock();
4241 cb->args[1] = idx;
4242 cb->args[0] = h;
4243
4244 return skb->len;
4245 }
4246
4247 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4248 {
4249 struct sk_buff *skb;
4250 struct net *net = dev_net(idev->dev);
4251 int err = -ENOBUFS;
4252
4253 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4254 if (skb == NULL)
4255 goto errout;
4256
4257 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4258 if (err < 0) {
4259 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4260 WARN_ON(err == -EMSGSIZE);
4261 kfree_skb(skb);
4262 goto errout;
4263 }
4264 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4265 return;
4266 errout:
4267 if (err < 0)
4268 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4269 }
4270
4271 static inline size_t inet6_prefix_nlmsg_size(void)
4272 {
4273 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4274 + nla_total_size(sizeof(struct in6_addr))
4275 + nla_total_size(sizeof(struct prefix_cacheinfo));
4276 }
4277
4278 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4279 struct prefix_info *pinfo, u32 portid, u32 seq,
4280 int event, unsigned int flags)
4281 {
4282 struct prefixmsg *pmsg;
4283 struct nlmsghdr *nlh;
4284 struct prefix_cacheinfo ci;
4285
4286 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4287 if (nlh == NULL)
4288 return -EMSGSIZE;
4289
4290 pmsg = nlmsg_data(nlh);
4291 pmsg->prefix_family = AF_INET6;
4292 pmsg->prefix_pad1 = 0;
4293 pmsg->prefix_pad2 = 0;
4294 pmsg->prefix_ifindex = idev->dev->ifindex;
4295 pmsg->prefix_len = pinfo->prefix_len;
4296 pmsg->prefix_type = pinfo->type;
4297 pmsg->prefix_pad3 = 0;
4298 pmsg->prefix_flags = 0;
4299 if (pinfo->onlink)
4300 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4301 if (pinfo->autoconf)
4302 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4303
4304 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4305 goto nla_put_failure;
4306 ci.preferred_time = ntohl(pinfo->prefered);
4307 ci.valid_time = ntohl(pinfo->valid);
4308 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4309 goto nla_put_failure;
4310 return nlmsg_end(skb, nlh);
4311
4312 nla_put_failure:
4313 nlmsg_cancel(skb, nlh);
4314 return -EMSGSIZE;
4315 }
4316
4317 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4318 struct prefix_info *pinfo)
4319 {
4320 struct sk_buff *skb;
4321 struct net *net = dev_net(idev->dev);
4322 int err = -ENOBUFS;
4323
4324 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4325 if (skb == NULL)
4326 goto errout;
4327
4328 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4329 if (err < 0) {
4330 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4331 WARN_ON(err == -EMSGSIZE);
4332 kfree_skb(skb);
4333 goto errout;
4334 }
4335 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4336 return;
4337 errout:
4338 if (err < 0)
4339 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4340 }
4341
4342 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4343 {
4344 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4345
4346 switch (event) {
4347 case RTM_NEWADDR:
4348 /*
4349 * If the address was optimistic
4350 * we inserted the route at the start of
4351 * our DAD process, so we don't need
4352 * to do it again
4353 */
4354 if (!(ifp->rt->rt6i_node))
4355 ip6_ins_rt(ifp->rt);
4356 if (ifp->idev->cnf.forwarding)
4357 addrconf_join_anycast(ifp);
4358 break;
4359 case RTM_DELADDR:
4360 if (ifp->idev->cnf.forwarding)
4361 addrconf_leave_anycast(ifp);
4362 addrconf_leave_solict(ifp->idev, &ifp->addr);
4363 dst_hold(&ifp->rt->dst);
4364
4365 if (ip6_del_rt(ifp->rt))
4366 dst_free(&ifp->rt->dst);
4367 break;
4368 }
4369 }
4370
4371 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4372 {
4373 rcu_read_lock_bh();
4374 if (likely(ifp->idev->dead == 0))
4375 __ipv6_ifa_notify(event, ifp);
4376 rcu_read_unlock_bh();
4377 }
4378
4379 #ifdef CONFIG_SYSCTL
4380
4381 static
4382 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4383 void __user *buffer, size_t *lenp, loff_t *ppos)
4384 {
4385 int *valp = ctl->data;
4386 int val = *valp;
4387 loff_t pos = *ppos;
4388 ctl_table lctl;
4389 int ret;
4390
4391 /*
4392 * ctl->data points to idev->cnf.forwarding, we should
4393 * not modify it until we get the rtnl lock.
4394 */
4395 lctl = *ctl;
4396 lctl.data = &val;
4397
4398 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4399
4400 if (write)
4401 ret = addrconf_fixup_forwarding(ctl, valp, val);
4402 if (ret)
4403 *ppos = pos;
4404 return ret;
4405 }
4406
4407 static void dev_disable_change(struct inet6_dev *idev)
4408 {
4409 if (!idev || !idev->dev)
4410 return;
4411
4412 if (idev->cnf.disable_ipv6)
4413 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4414 else
4415 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4416 }
4417
4418 static void addrconf_disable_change(struct net *net, __s32 newf)
4419 {
4420 struct net_device *dev;
4421 struct inet6_dev *idev;
4422
4423 rcu_read_lock();
4424 for_each_netdev_rcu(net, dev) {
4425 idev = __in6_dev_get(dev);
4426 if (idev) {
4427 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4428 idev->cnf.disable_ipv6 = newf;
4429 if (changed)
4430 dev_disable_change(idev);
4431 }
4432 }
4433 rcu_read_unlock();
4434 }
4435
4436 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4437 {
4438 struct net *net;
4439 int old;
4440
4441 if (!rtnl_trylock())
4442 return restart_syscall();
4443
4444 net = (struct net *)table->extra2;
4445 old = *p;
4446 *p = newf;
4447
4448 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4449 rtnl_unlock();
4450 return 0;
4451 }
4452
4453 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4454 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4455 addrconf_disable_change(net, newf);
4456 } else if ((!newf) ^ (!old))
4457 dev_disable_change((struct inet6_dev *)table->extra1);
4458
4459 rtnl_unlock();
4460 return 0;
4461 }
4462
4463 static
4464 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4465 void __user *buffer, size_t *lenp, loff_t *ppos)
4466 {
4467 int *valp = ctl->data;
4468 int val = *valp;
4469 loff_t pos = *ppos;
4470 ctl_table lctl;
4471 int ret;
4472
4473 /*
4474 * ctl->data points to idev->cnf.disable_ipv6, we should
4475 * not modify it until we get the rtnl lock.
4476 */
4477 lctl = *ctl;
4478 lctl.data = &val;
4479
4480 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4481
4482 if (write)
4483 ret = addrconf_disable_ipv6(ctl, valp, val);
4484 if (ret)
4485 *ppos = pos;
4486 return ret;
4487 }
4488
4489 static struct addrconf_sysctl_table
4490 {
4491 struct ctl_table_header *sysctl_header;
4492 ctl_table addrconf_vars[DEVCONF_MAX+1];
4493 } addrconf_sysctl __read_mostly = {
4494 .sysctl_header = NULL,
4495 .addrconf_vars = {
4496 {
4497 .procname = "forwarding",
4498 .data = &ipv6_devconf.forwarding,
4499 .maxlen = sizeof(int),
4500 .mode = 0644,
4501 .proc_handler = addrconf_sysctl_forward,
4502 },
4503 {
4504 .procname = "hop_limit",
4505 .data = &ipv6_devconf.hop_limit,
4506 .maxlen = sizeof(int),
4507 .mode = 0644,
4508 .proc_handler = proc_dointvec,
4509 },
4510 {
4511 .procname = "mtu",
4512 .data = &ipv6_devconf.mtu6,
4513 .maxlen = sizeof(int),
4514 .mode = 0644,
4515 .proc_handler = proc_dointvec,
4516 },
4517 {
4518 .procname = "accept_ra",
4519 .data = &ipv6_devconf.accept_ra,
4520 .maxlen = sizeof(int),
4521 .mode = 0644,
4522 .proc_handler = proc_dointvec,
4523 },
4524 {
4525 .procname = "accept_redirects",
4526 .data = &ipv6_devconf.accept_redirects,
4527 .maxlen = sizeof(int),
4528 .mode = 0644,
4529 .proc_handler = proc_dointvec,
4530 },
4531 {
4532 .procname = "autoconf",
4533 .data = &ipv6_devconf.autoconf,
4534 .maxlen = sizeof(int),
4535 .mode = 0644,
4536 .proc_handler = proc_dointvec,
4537 },
4538 {
4539 .procname = "dad_transmits",
4540 .data = &ipv6_devconf.dad_transmits,
4541 .maxlen = sizeof(int),
4542 .mode = 0644,
4543 .proc_handler = proc_dointvec,
4544 },
4545 {
4546 .procname = "router_solicitations",
4547 .data = &ipv6_devconf.rtr_solicits,
4548 .maxlen = sizeof(int),
4549 .mode = 0644,
4550 .proc_handler = proc_dointvec,
4551 },
4552 {
4553 .procname = "router_solicitation_interval",
4554 .data = &ipv6_devconf.rtr_solicit_interval,
4555 .maxlen = sizeof(int),
4556 .mode = 0644,
4557 .proc_handler = proc_dointvec_jiffies,
4558 },
4559 {
4560 .procname = "router_solicitation_delay",
4561 .data = &ipv6_devconf.rtr_solicit_delay,
4562 .maxlen = sizeof(int),
4563 .mode = 0644,
4564 .proc_handler = proc_dointvec_jiffies,
4565 },
4566 {
4567 .procname = "force_mld_version",
4568 .data = &ipv6_devconf.force_mld_version,
4569 .maxlen = sizeof(int),
4570 .mode = 0644,
4571 .proc_handler = proc_dointvec,
4572 },
4573 #ifdef CONFIG_IPV6_PRIVACY
4574 {
4575 .procname = "use_tempaddr",
4576 .data = &ipv6_devconf.use_tempaddr,
4577 .maxlen = sizeof(int),
4578 .mode = 0644,
4579 .proc_handler = proc_dointvec,
4580 },
4581 {
4582 .procname = "temp_valid_lft",
4583 .data = &ipv6_devconf.temp_valid_lft,
4584 .maxlen = sizeof(int),
4585 .mode = 0644,
4586 .proc_handler = proc_dointvec,
4587 },
4588 {
4589 .procname = "temp_prefered_lft",
4590 .data = &ipv6_devconf.temp_prefered_lft,
4591 .maxlen = sizeof(int),
4592 .mode = 0644,
4593 .proc_handler = proc_dointvec,
4594 },
4595 {
4596 .procname = "regen_max_retry",
4597 .data = &ipv6_devconf.regen_max_retry,
4598 .maxlen = sizeof(int),
4599 .mode = 0644,
4600 .proc_handler = proc_dointvec,
4601 },
4602 {
4603 .procname = "max_desync_factor",
4604 .data = &ipv6_devconf.max_desync_factor,
4605 .maxlen = sizeof(int),
4606 .mode = 0644,
4607 .proc_handler = proc_dointvec,
4608 },
4609 #endif
4610 {
4611 .procname = "max_addresses",
4612 .data = &ipv6_devconf.max_addresses,
4613 .maxlen = sizeof(int),
4614 .mode = 0644,
4615 .proc_handler = proc_dointvec,
4616 },
4617 {
4618 .procname = "accept_ra_defrtr",
4619 .data = &ipv6_devconf.accept_ra_defrtr,
4620 .maxlen = sizeof(int),
4621 .mode = 0644,
4622 .proc_handler = proc_dointvec,
4623 },
4624 {
4625 .procname = "accept_ra_pinfo",
4626 .data = &ipv6_devconf.accept_ra_pinfo,
4627 .maxlen = sizeof(int),
4628 .mode = 0644,
4629 .proc_handler = proc_dointvec,
4630 },
4631 #ifdef CONFIG_IPV6_ROUTER_PREF
4632 {
4633 .procname = "accept_ra_rtr_pref",
4634 .data = &ipv6_devconf.accept_ra_rtr_pref,
4635 .maxlen = sizeof(int),
4636 .mode = 0644,
4637 .proc_handler = proc_dointvec,
4638 },
4639 {
4640 .procname = "router_probe_interval",
4641 .data = &ipv6_devconf.rtr_probe_interval,
4642 .maxlen = sizeof(int),
4643 .mode = 0644,
4644 .proc_handler = proc_dointvec_jiffies,
4645 },
4646 #ifdef CONFIG_IPV6_ROUTE_INFO
4647 {
4648 .procname = "accept_ra_rt_info_max_plen",
4649 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4650 .maxlen = sizeof(int),
4651 .mode = 0644,
4652 .proc_handler = proc_dointvec,
4653 },
4654 #endif
4655 #endif
4656 {
4657 .procname = "proxy_ndp",
4658 .data = &ipv6_devconf.proxy_ndp,
4659 .maxlen = sizeof(int),
4660 .mode = 0644,
4661 .proc_handler = proc_dointvec,
4662 },
4663 {
4664 .procname = "accept_source_route",
4665 .data = &ipv6_devconf.accept_source_route,
4666 .maxlen = sizeof(int),
4667 .mode = 0644,
4668 .proc_handler = proc_dointvec,
4669 },
4670 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4671 {
4672 .procname = "optimistic_dad",
4673 .data = &ipv6_devconf.optimistic_dad,
4674 .maxlen = sizeof(int),
4675 .mode = 0644,
4676 .proc_handler = proc_dointvec,
4677
4678 },
4679 #endif
4680 #ifdef CONFIG_IPV6_MROUTE
4681 {
4682 .procname = "mc_forwarding",
4683 .data = &ipv6_devconf.mc_forwarding,
4684 .maxlen = sizeof(int),
4685 .mode = 0444,
4686 .proc_handler = proc_dointvec,
4687 },
4688 #endif
4689 {
4690 .procname = "disable_ipv6",
4691 .data = &ipv6_devconf.disable_ipv6,
4692 .maxlen = sizeof(int),
4693 .mode = 0644,
4694 .proc_handler = addrconf_sysctl_disable,
4695 },
4696 {
4697 .procname = "accept_dad",
4698 .data = &ipv6_devconf.accept_dad,
4699 .maxlen = sizeof(int),
4700 .mode = 0644,
4701 .proc_handler = proc_dointvec,
4702 },
4703 {
4704 .procname = "force_tllao",
4705 .data = &ipv6_devconf.force_tllao,
4706 .maxlen = sizeof(int),
4707 .mode = 0644,
4708 .proc_handler = proc_dointvec
4709 },
4710 {
4711 .procname = "ndisc_notify",
4712 .data = &ipv6_devconf.ndisc_notify,
4713 .maxlen = sizeof(int),
4714 .mode = 0644,
4715 .proc_handler = proc_dointvec
4716 },
4717 {
4718 /* sentinel */
4719 }
4720 },
4721 };
4722
4723 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4724 struct inet6_dev *idev, struct ipv6_devconf *p)
4725 {
4726 int i;
4727 struct addrconf_sysctl_table *t;
4728 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4729
4730 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4731 if (t == NULL)
4732 goto out;
4733
4734 for (i = 0; t->addrconf_vars[i].data; i++) {
4735 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4736 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4737 t->addrconf_vars[i].extra2 = net;
4738 }
4739
4740 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4741
4742 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4743 if (t->sysctl_header == NULL)
4744 goto free;
4745
4746 p->sysctl = t;
4747 return 0;
4748
4749 free:
4750 kfree(t);
4751 out:
4752 return -ENOBUFS;
4753 }
4754
4755 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4756 {
4757 struct addrconf_sysctl_table *t;
4758
4759 if (p->sysctl == NULL)
4760 return;
4761
4762 t = p->sysctl;
4763 p->sysctl = NULL;
4764 unregister_net_sysctl_table(t->sysctl_header);
4765 kfree(t);
4766 }
4767
4768 static void addrconf_sysctl_register(struct inet6_dev *idev)
4769 {
4770 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4771 &ndisc_ifinfo_sysctl_change);
4772 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4773 idev, &idev->cnf);
4774 }
4775
4776 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4777 {
4778 __addrconf_sysctl_unregister(&idev->cnf);
4779 neigh_sysctl_unregister(idev->nd_parms);
4780 }
4781
4782
4783 #endif
4784
4785 static int __net_init addrconf_init_net(struct net *net)
4786 {
4787 int err;
4788 struct ipv6_devconf *all, *dflt;
4789
4790 err = -ENOMEM;
4791 all = &ipv6_devconf;
4792 dflt = &ipv6_devconf_dflt;
4793
4794 if (!net_eq(net, &init_net)) {
4795 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4796 if (all == NULL)
4797 goto err_alloc_all;
4798
4799 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4800 if (dflt == NULL)
4801 goto err_alloc_dflt;
4802 } else {
4803 /* these will be inherited by all namespaces */
4804 dflt->autoconf = ipv6_defaults.autoconf;
4805 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4806 }
4807
4808 net->ipv6.devconf_all = all;
4809 net->ipv6.devconf_dflt = dflt;
4810
4811 #ifdef CONFIG_SYSCTL
4812 err = __addrconf_sysctl_register(net, "all", NULL, all);
4813 if (err < 0)
4814 goto err_reg_all;
4815
4816 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4817 if (err < 0)
4818 goto err_reg_dflt;
4819 #endif
4820 return 0;
4821
4822 #ifdef CONFIG_SYSCTL
4823 err_reg_dflt:
4824 __addrconf_sysctl_unregister(all);
4825 err_reg_all:
4826 kfree(dflt);
4827 #endif
4828 err_alloc_dflt:
4829 kfree(all);
4830 err_alloc_all:
4831 return err;
4832 }
4833
4834 static void __net_exit addrconf_exit_net(struct net *net)
4835 {
4836 #ifdef CONFIG_SYSCTL
4837 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4838 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4839 #endif
4840 if (!net_eq(net, &init_net)) {
4841 kfree(net->ipv6.devconf_dflt);
4842 kfree(net->ipv6.devconf_all);
4843 }
4844 }
4845
4846 static struct pernet_operations addrconf_ops = {
4847 .init = addrconf_init_net,
4848 .exit = addrconf_exit_net,
4849 };
4850
4851 /*
4852 * Device notifier
4853 */
4854
4855 int register_inet6addr_notifier(struct notifier_block *nb)
4856 {
4857 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4858 }
4859 EXPORT_SYMBOL(register_inet6addr_notifier);
4860
4861 int unregister_inet6addr_notifier(struct notifier_block *nb)
4862 {
4863 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4864 }
4865 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4866
4867 static struct rtnl_af_ops inet6_ops = {
4868 .family = AF_INET6,
4869 .fill_link_af = inet6_fill_link_af,
4870 .get_link_af_size = inet6_get_link_af_size,
4871 };
4872
4873 /*
4874 * Init / cleanup code
4875 */
4876
4877 int __init addrconf_init(void)
4878 {
4879 int i, err;
4880
4881 err = ipv6_addr_label_init();
4882 if (err < 0) {
4883 pr_crit("%s: cannot initialize default policy table: %d\n",
4884 __func__, err);
4885 goto out;
4886 }
4887
4888 err = register_pernet_subsys(&addrconf_ops);
4889 if (err < 0)
4890 goto out_addrlabel;
4891
4892 /* The addrconf netdev notifier requires that loopback_dev
4893 * has it's ipv6 private information allocated and setup
4894 * before it can bring up and give link-local addresses
4895 * to other devices which are up.
4896 *
4897 * Unfortunately, loopback_dev is not necessarily the first
4898 * entry in the global dev_base list of net devices. In fact,
4899 * it is likely to be the very last entry on that list.
4900 * So this causes the notifier registry below to try and
4901 * give link-local addresses to all devices besides loopback_dev
4902 * first, then loopback_dev, which cases all the non-loopback_dev
4903 * devices to fail to get a link-local address.
4904 *
4905 * So, as a temporary fix, allocate the ipv6 structure for
4906 * loopback_dev first by hand.
4907 * Longer term, all of the dependencies ipv6 has upon the loopback
4908 * device and it being up should be removed.
4909 */
4910 rtnl_lock();
4911 if (!ipv6_add_dev(init_net.loopback_dev))
4912 err = -ENOMEM;
4913 rtnl_unlock();
4914 if (err)
4915 goto errlo;
4916
4917 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4918 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4919
4920 register_netdevice_notifier(&ipv6_dev_notf);
4921
4922 addrconf_verify(0);
4923
4924 err = rtnl_af_register(&inet6_ops);
4925 if (err < 0)
4926 goto errout_af;
4927
4928 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4929 NULL);
4930 if (err < 0)
4931 goto errout;
4932
4933 /* Only the first call to __rtnl_register can fail */
4934 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4935 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4936 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4937 inet6_dump_ifaddr, NULL);
4938 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4939 inet6_dump_ifmcaddr, NULL);
4940 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4941 inet6_dump_ifacaddr, NULL);
4942 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
4943 NULL, NULL);
4944
4945 ipv6_addr_label_rtnl_register();
4946
4947 return 0;
4948 errout:
4949 rtnl_af_unregister(&inet6_ops);
4950 errout_af:
4951 unregister_netdevice_notifier(&ipv6_dev_notf);
4952 errlo:
4953 unregister_pernet_subsys(&addrconf_ops);
4954 out_addrlabel:
4955 ipv6_addr_label_cleanup();
4956 out:
4957 return err;
4958 }
4959
4960 void addrconf_cleanup(void)
4961 {
4962 struct net_device *dev;
4963 int i;
4964
4965 unregister_netdevice_notifier(&ipv6_dev_notf);
4966 unregister_pernet_subsys(&addrconf_ops);
4967 ipv6_addr_label_cleanup();
4968
4969 rtnl_lock();
4970
4971 __rtnl_af_unregister(&inet6_ops);
4972
4973 /* clean dev list */
4974 for_each_netdev(&init_net, dev) {
4975 if (__in6_dev_get(dev) == NULL)
4976 continue;
4977 addrconf_ifdown(dev, 1);
4978 }
4979 addrconf_ifdown(init_net.loopback_dev, 2);
4980
4981 /*
4982 * Check hash table.
4983 */
4984 spin_lock_bh(&addrconf_hash_lock);
4985 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4986 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4987 spin_unlock_bh(&addrconf_hash_lock);
4988
4989 del_timer(&addr_chk_timer);
4990 rtnl_unlock();
4991 }
CJK support for tty framebuffer vt