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rtnl/ipv4: use netconf msg to advertise rp_filter status
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #include <linux/slab.h>
59 #ifdef CONFIG_SYSCTL
60 #include <linux/sysctl.h>
61 #endif
62 #include <linux/capability.h>
63 #include <linux/delay.h>
64 #include <linux/notifier.h>
65 #include <linux/string.h>
66 #include <linux/hash.h>
67
68 #include <net/net_namespace.h>
69 #include <net/sock.h>
70 #include <net/snmp.h>
71
72 #include <net/af_ieee802154.h>
73 #include <net/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 #define ADDRCONF_TIMER_FUZZ_MINUS (HZ > 50 ? HZ/50 : 1)
114 #define ADDRCONF_TIMER_FUZZ (HZ / 4)
115 #define ADDRCONF_TIMER_FUZZ_MAX (HZ)
116
117 #ifdef CONFIG_SYSCTL
118 static void addrconf_sysctl_register(struct inet6_dev *idev);
119 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
120 #else
121 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
122 {
123 }
124
125 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
126 {
127 }
128 #endif
129
130 #ifdef CONFIG_IPV6_PRIVACY
131 static void __ipv6_regen_rndid(struct inet6_dev *idev);
132 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
133 static void ipv6_regen_rndid(unsigned long data);
134 #endif
135
136 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
137 static int ipv6_count_addresses(struct inet6_dev *idev);
138
139 /*
140 * Configured unicast address hash table
141 */
142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
143 static DEFINE_SPINLOCK(addrconf_hash_lock);
144
145 static void addrconf_verify(unsigned long);
146
147 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
148 static DEFINE_SPINLOCK(addrconf_verify_lock);
149
150 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
151 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
152
153 static void addrconf_type_change(struct net_device *dev,
154 unsigned long event);
155 static int addrconf_ifdown(struct net_device *dev, int how);
156
157 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
158 static void addrconf_dad_timer(unsigned long data);
159 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
160 static void addrconf_dad_run(struct inet6_dev *idev);
161 static void addrconf_rs_timer(unsigned long data);
162 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
163 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
164
165 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
166 struct prefix_info *pinfo);
167 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
168 struct net_device *dev);
169
170 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
171
172 static struct ipv6_devconf ipv6_devconf __read_mostly = {
173 .forwarding = 0,
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
176 .accept_ra = 1,
177 .accept_redirects = 1,
178 .autoconf = 1,
179 .force_mld_version = 0,
180 .dad_transmits = 1,
181 .rtr_solicits = MAX_RTR_SOLICITATIONS,
182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
184 #ifdef CONFIG_IPV6_PRIVACY
185 .use_tempaddr = 0,
186 .temp_valid_lft = TEMP_VALID_LIFETIME,
187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
188 .regen_max_retry = REGEN_MAX_RETRY,
189 .max_desync_factor = MAX_DESYNC_FACTOR,
190 #endif
191 .max_addresses = IPV6_MAX_ADDRESSES,
192 .accept_ra_defrtr = 1,
193 .accept_ra_pinfo = 1,
194 #ifdef CONFIG_IPV6_ROUTER_PREF
195 .accept_ra_rtr_pref = 1,
196 .rtr_probe_interval = 60 * HZ,
197 #ifdef CONFIG_IPV6_ROUTE_INFO
198 .accept_ra_rt_info_max_plen = 0,
199 #endif
200 #endif
201 .proxy_ndp = 0,
202 .accept_source_route = 0, /* we do not accept RH0 by default. */
203 .disable_ipv6 = 0,
204 .accept_dad = 1,
205 };
206
207 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
208 .forwarding = 0,
209 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
210 .mtu6 = IPV6_MIN_MTU,
211 .accept_ra = 1,
212 .accept_redirects = 1,
213 .autoconf = 1,
214 .dad_transmits = 1,
215 .rtr_solicits = MAX_RTR_SOLICITATIONS,
216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
218 #ifdef CONFIG_IPV6_PRIVACY
219 .use_tempaddr = 0,
220 .temp_valid_lft = TEMP_VALID_LIFETIME,
221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
222 .regen_max_retry = REGEN_MAX_RETRY,
223 .max_desync_factor = MAX_DESYNC_FACTOR,
224 #endif
225 .max_addresses = IPV6_MAX_ADDRESSES,
226 .accept_ra_defrtr = 1,
227 .accept_ra_pinfo = 1,
228 #ifdef CONFIG_IPV6_ROUTER_PREF
229 .accept_ra_rtr_pref = 1,
230 .rtr_probe_interval = 60 * HZ,
231 #ifdef CONFIG_IPV6_ROUTE_INFO
232 .accept_ra_rt_info_max_plen = 0,
233 #endif
234 #endif
235 .proxy_ndp = 0,
236 .accept_source_route = 0, /* we do not accept RH0 by default. */
237 .disable_ipv6 = 0,
238 .accept_dad = 1,
239 };
240
241 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
242 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
243 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
244 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
245 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
246
247 /* Check if a valid qdisc is available */
248 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
249 {
250 return !qdisc_tx_is_noop(dev);
251 }
252
253 /* Check if a route is valid prefix route */
254 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
255 {
256 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
257 }
258
259 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
260 {
261 if (del_timer(&ifp->timer))
262 __in6_ifa_put(ifp);
263 }
264
265 enum addrconf_timer_t {
266 AC_NONE,
267 AC_DAD,
268 AC_RS,
269 };
270
271 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
272 enum addrconf_timer_t what,
273 unsigned long when)
274 {
275 if (!del_timer(&ifp->timer))
276 in6_ifa_hold(ifp);
277
278 switch (what) {
279 case AC_DAD:
280 ifp->timer.function = addrconf_dad_timer;
281 break;
282 case AC_RS:
283 ifp->timer.function = addrconf_rs_timer;
284 break;
285 default:
286 break;
287 }
288 ifp->timer.expires = jiffies + when;
289 add_timer(&ifp->timer);
290 }
291
292 static int snmp6_alloc_dev(struct inet6_dev *idev)
293 {
294 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
295 sizeof(struct ipstats_mib),
296 __alignof__(struct ipstats_mib)) < 0)
297 goto err_ip;
298 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
299 GFP_KERNEL);
300 if (!idev->stats.icmpv6dev)
301 goto err_icmp;
302 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
303 GFP_KERNEL);
304 if (!idev->stats.icmpv6msgdev)
305 goto err_icmpmsg;
306
307 return 0;
308
309 err_icmpmsg:
310 kfree(idev->stats.icmpv6dev);
311 err_icmp:
312 snmp_mib_free((void __percpu **)idev->stats.ipv6);
313 err_ip:
314 return -ENOMEM;
315 }
316
317 static void snmp6_free_dev(struct inet6_dev *idev)
318 {
319 kfree(idev->stats.icmpv6msgdev);
320 kfree(idev->stats.icmpv6dev);
321 snmp_mib_free((void __percpu **)idev->stats.ipv6);
322 }
323
324 /* Nobody refers to this device, we may destroy it. */
325
326 void in6_dev_finish_destroy(struct inet6_dev *idev)
327 {
328 struct net_device *dev = idev->dev;
329
330 WARN_ON(!list_empty(&idev->addr_list));
331 WARN_ON(idev->mc_list != NULL);
332
333 #ifdef NET_REFCNT_DEBUG
334 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
335 #endif
336 dev_put(dev);
337 if (!idev->dead) {
338 pr_warn("Freeing alive inet6 device %p\n", idev);
339 return;
340 }
341 snmp6_free_dev(idev);
342 kfree_rcu(idev, rcu);
343 }
344 EXPORT_SYMBOL(in6_dev_finish_destroy);
345
346 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
347 {
348 struct inet6_dev *ndev;
349
350 ASSERT_RTNL();
351
352 if (dev->mtu < IPV6_MIN_MTU)
353 return NULL;
354
355 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
356
357 if (ndev == NULL)
358 return NULL;
359
360 rwlock_init(&ndev->lock);
361 ndev->dev = dev;
362 INIT_LIST_HEAD(&ndev->addr_list);
363
364 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
365 ndev->cnf.mtu6 = dev->mtu;
366 ndev->cnf.sysctl = NULL;
367 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
368 if (ndev->nd_parms == NULL) {
369 kfree(ndev);
370 return NULL;
371 }
372 if (ndev->cnf.forwarding)
373 dev_disable_lro(dev);
374 /* We refer to the device */
375 dev_hold(dev);
376
377 if (snmp6_alloc_dev(ndev) < 0) {
378 ADBG((KERN_WARNING
379 "%s: cannot allocate memory for statistics; dev=%s.\n",
380 __func__, dev->name));
381 neigh_parms_release(&nd_tbl, ndev->nd_parms);
382 dev_put(dev);
383 kfree(ndev);
384 return NULL;
385 }
386
387 if (snmp6_register_dev(ndev) < 0) {
388 ADBG((KERN_WARNING
389 "%s: cannot create /proc/net/dev_snmp6/%s\n",
390 __func__, dev->name));
391 neigh_parms_release(&nd_tbl, ndev->nd_parms);
392 ndev->dead = 1;
393 in6_dev_finish_destroy(ndev);
394 return NULL;
395 }
396
397 /* One reference from device. We must do this before
398 * we invoke __ipv6_regen_rndid().
399 */
400 in6_dev_hold(ndev);
401
402 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
403 ndev->cnf.accept_dad = -1;
404
405 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
406 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
407 pr_info("%s: Disabled Multicast RS\n", dev->name);
408 ndev->cnf.rtr_solicits = 0;
409 }
410 #endif
411
412 #ifdef CONFIG_IPV6_PRIVACY
413 INIT_LIST_HEAD(&ndev->tempaddr_list);
414 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
415 if ((dev->flags&IFF_LOOPBACK) ||
416 dev->type == ARPHRD_TUNNEL ||
417 dev->type == ARPHRD_TUNNEL6 ||
418 dev->type == ARPHRD_SIT ||
419 dev->type == ARPHRD_NONE) {
420 ndev->cnf.use_tempaddr = -1;
421 } else {
422 in6_dev_hold(ndev);
423 ipv6_regen_rndid((unsigned long) ndev);
424 }
425 #endif
426
427 if (netif_running(dev) && addrconf_qdisc_ok(dev))
428 ndev->if_flags |= IF_READY;
429
430 ipv6_mc_init_dev(ndev);
431 ndev->tstamp = jiffies;
432 addrconf_sysctl_register(ndev);
433 /* protected by rtnl_lock */
434 rcu_assign_pointer(dev->ip6_ptr, ndev);
435
436 /* Join all-node multicast group */
437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
438
439 /* Join all-router multicast group if forwarding is set */
440 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
442
443 return ndev;
444 }
445
446 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
447 {
448 struct inet6_dev *idev;
449
450 ASSERT_RTNL();
451
452 idev = __in6_dev_get(dev);
453 if (!idev) {
454 idev = ipv6_add_dev(dev);
455 if (!idev)
456 return NULL;
457 }
458
459 if (dev->flags&IFF_UP)
460 ipv6_mc_up(idev);
461 return idev;
462 }
463
464 static int inet6_netconf_msgsize_devconf(int type)
465 {
466 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
467 + nla_total_size(4); /* NETCONFA_IFINDEX */
468
469 /* type -1 is used for ALL */
470 if (type == -1 || type == NETCONFA_FORWARDING)
471 size += nla_total_size(4);
472
473 return size;
474 }
475
476 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
477 struct ipv6_devconf *devconf, u32 portid,
478 u32 seq, int event, unsigned int flags,
479 int type)
480 {
481 struct nlmsghdr *nlh;
482 struct netconfmsg *ncm;
483
484 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
485 flags);
486 if (nlh == NULL)
487 return -EMSGSIZE;
488
489 ncm = nlmsg_data(nlh);
490 ncm->ncm_family = AF_INET6;
491
492 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
493 goto nla_put_failure;
494
495 /* type -1 is used for ALL */
496 if ((type == -1 || type == NETCONFA_FORWARDING) &&
497 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
498 goto nla_put_failure;
499
500 return nlmsg_end(skb, nlh);
501
502 nla_put_failure:
503 nlmsg_cancel(skb, nlh);
504 return -EMSGSIZE;
505 }
506
507 static void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
508 struct ipv6_devconf *devconf)
509 {
510 struct sk_buff *skb;
511 int err = -ENOBUFS;
512
513 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
514 if (skb == NULL)
515 goto errout;
516
517 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
518 RTM_NEWNETCONF, 0, type);
519 if (err < 0) {
520 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
521 WARN_ON(err == -EMSGSIZE);
522 kfree_skb(skb);
523 goto errout;
524 }
525 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
526 return;
527 errout:
528 if (err < 0)
529 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
530 }
531
532 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
533 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
534 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
535 };
536
537 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
538 struct nlmsghdr *nlh,
539 void *arg)
540 {
541 struct net *net = sock_net(in_skb->sk);
542 struct nlattr *tb[NETCONFA_MAX+1];
543 struct netconfmsg *ncm;
544 struct sk_buff *skb;
545 struct ipv6_devconf *devconf;
546 struct inet6_dev *in6_dev;
547 struct net_device *dev;
548 int ifindex;
549 int err;
550
551 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
552 devconf_ipv6_policy);
553 if (err < 0)
554 goto errout;
555
556 err = EINVAL;
557 if (!tb[NETCONFA_IFINDEX])
558 goto errout;
559
560 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
561 switch (ifindex) {
562 case NETCONFA_IFINDEX_ALL:
563 devconf = net->ipv6.devconf_all;
564 break;
565 case NETCONFA_IFINDEX_DEFAULT:
566 devconf = net->ipv6.devconf_dflt;
567 break;
568 default:
569 dev = __dev_get_by_index(net, ifindex);
570 if (dev == NULL)
571 goto errout;
572 in6_dev = __in6_dev_get(dev);
573 if (in6_dev == NULL)
574 goto errout;
575 devconf = &in6_dev->cnf;
576 break;
577 }
578
579 err = -ENOBUFS;
580 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
581 if (skb == NULL)
582 goto errout;
583
584 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
585 NETLINK_CB(in_skb).portid,
586 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
587 -1);
588 if (err < 0) {
589 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
590 WARN_ON(err == -EMSGSIZE);
591 kfree_skb(skb);
592 goto errout;
593 }
594 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
595 errout:
596 return err;
597 }
598
599 #ifdef CONFIG_SYSCTL
600 static void dev_forward_change(struct inet6_dev *idev)
601 {
602 struct net_device *dev;
603 struct inet6_ifaddr *ifa;
604
605 if (!idev)
606 return;
607 dev = idev->dev;
608 if (idev->cnf.forwarding)
609 dev_disable_lro(dev);
610 if (dev && (dev->flags & IFF_MULTICAST)) {
611 if (idev->cnf.forwarding)
612 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
613 else
614 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
615 }
616
617 list_for_each_entry(ifa, &idev->addr_list, if_list) {
618 if (ifa->flags&IFA_F_TENTATIVE)
619 continue;
620 if (idev->cnf.forwarding)
621 addrconf_join_anycast(ifa);
622 else
623 addrconf_leave_anycast(ifa);
624 }
625 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
626 dev->ifindex, &idev->cnf);
627 }
628
629
630 static void addrconf_forward_change(struct net *net, __s32 newf)
631 {
632 struct net_device *dev;
633 struct inet6_dev *idev;
634
635 for_each_netdev(net, dev) {
636 idev = __in6_dev_get(dev);
637 if (idev) {
638 int changed = (!idev->cnf.forwarding) ^ (!newf);
639 idev->cnf.forwarding = newf;
640 if (changed)
641 dev_forward_change(idev);
642 }
643 }
644 }
645
646 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
647 {
648 struct net *net;
649 int old;
650
651 if (!rtnl_trylock())
652 return restart_syscall();
653
654 net = (struct net *)table->extra2;
655 old = *p;
656 *p = newf;
657
658 if (p == &net->ipv6.devconf_dflt->forwarding) {
659 if ((!newf) ^ (!old))
660 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
661 NETCONFA_IFINDEX_DEFAULT,
662 net->ipv6.devconf_dflt);
663 rtnl_unlock();
664 return 0;
665 }
666
667 if (p == &net->ipv6.devconf_all->forwarding) {
668 net->ipv6.devconf_dflt->forwarding = newf;
669 addrconf_forward_change(net, newf);
670 if ((!newf) ^ (!old))
671 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
672 NETCONFA_IFINDEX_ALL,
673 net->ipv6.devconf_all);
674 } else if ((!newf) ^ (!old))
675 dev_forward_change((struct inet6_dev *)table->extra1);
676 rtnl_unlock();
677
678 if (newf)
679 rt6_purge_dflt_routers(net);
680 return 1;
681 }
682 #endif
683
684 /* Nobody refers to this ifaddr, destroy it */
685 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
686 {
687 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
688
689 #ifdef NET_REFCNT_DEBUG
690 pr_debug("%s\n", __func__);
691 #endif
692
693 in6_dev_put(ifp->idev);
694
695 if (del_timer(&ifp->timer))
696 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
697
698 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
699 pr_warn("Freeing alive inet6 address %p\n", ifp);
700 return;
701 }
702 dst_release(&ifp->rt->dst);
703
704 kfree_rcu(ifp, rcu);
705 }
706
707 static void
708 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
709 {
710 struct list_head *p;
711 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
712
713 /*
714 * Each device address list is sorted in order of scope -
715 * global before linklocal.
716 */
717 list_for_each(p, &idev->addr_list) {
718 struct inet6_ifaddr *ifa
719 = list_entry(p, struct inet6_ifaddr, if_list);
720 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
721 break;
722 }
723
724 list_add_tail(&ifp->if_list, p);
725 }
726
727 static u32 inet6_addr_hash(const struct in6_addr *addr)
728 {
729 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
730 }
731
732 /* On success it returns ifp with increased reference count */
733
734 static struct inet6_ifaddr *
735 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
736 int scope, u32 flags)
737 {
738 struct inet6_ifaddr *ifa = NULL;
739 struct rt6_info *rt;
740 unsigned int hash;
741 int err = 0;
742 int addr_type = ipv6_addr_type(addr);
743
744 if (addr_type == IPV6_ADDR_ANY ||
745 addr_type & IPV6_ADDR_MULTICAST ||
746 (!(idev->dev->flags & IFF_LOOPBACK) &&
747 addr_type & IPV6_ADDR_LOOPBACK))
748 return ERR_PTR(-EADDRNOTAVAIL);
749
750 rcu_read_lock_bh();
751 if (idev->dead) {
752 err = -ENODEV; /*XXX*/
753 goto out2;
754 }
755
756 if (idev->cnf.disable_ipv6) {
757 err = -EACCES;
758 goto out2;
759 }
760
761 spin_lock(&addrconf_hash_lock);
762
763 /* Ignore adding duplicate addresses on an interface */
764 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
765 ADBG(("ipv6_add_addr: already assigned\n"));
766 err = -EEXIST;
767 goto out;
768 }
769
770 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
771
772 if (ifa == NULL) {
773 ADBG(("ipv6_add_addr: malloc failed\n"));
774 err = -ENOBUFS;
775 goto out;
776 }
777
778 rt = addrconf_dst_alloc(idev, addr, false);
779 if (IS_ERR(rt)) {
780 err = PTR_ERR(rt);
781 goto out;
782 }
783
784 ifa->addr = *addr;
785
786 spin_lock_init(&ifa->lock);
787 spin_lock_init(&ifa->state_lock);
788 init_timer(&ifa->timer);
789 INIT_HLIST_NODE(&ifa->addr_lst);
790 ifa->timer.data = (unsigned long) ifa;
791 ifa->scope = scope;
792 ifa->prefix_len = pfxlen;
793 ifa->flags = flags | IFA_F_TENTATIVE;
794 ifa->cstamp = ifa->tstamp = jiffies;
795
796 ifa->rt = rt;
797
798 ifa->idev = idev;
799 in6_dev_hold(idev);
800 /* For caller */
801 in6_ifa_hold(ifa);
802
803 /* Add to big hash table */
804 hash = inet6_addr_hash(addr);
805
806 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
807 spin_unlock(&addrconf_hash_lock);
808
809 write_lock(&idev->lock);
810 /* Add to inet6_dev unicast addr list. */
811 ipv6_link_dev_addr(idev, ifa);
812
813 #ifdef CONFIG_IPV6_PRIVACY
814 if (ifa->flags&IFA_F_TEMPORARY) {
815 list_add(&ifa->tmp_list, &idev->tempaddr_list);
816 in6_ifa_hold(ifa);
817 }
818 #endif
819
820 in6_ifa_hold(ifa);
821 write_unlock(&idev->lock);
822 out2:
823 rcu_read_unlock_bh();
824
825 if (likely(err == 0))
826 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
827 else {
828 kfree(ifa);
829 ifa = ERR_PTR(err);
830 }
831
832 return ifa;
833 out:
834 spin_unlock(&addrconf_hash_lock);
835 goto out2;
836 }
837
838 /* This function wants to get referenced ifp and releases it before return */
839
840 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
841 {
842 struct inet6_ifaddr *ifa, *ifn;
843 struct inet6_dev *idev = ifp->idev;
844 int state;
845 int deleted = 0, onlink = 0;
846 unsigned long expires = jiffies;
847
848 spin_lock_bh(&ifp->state_lock);
849 state = ifp->state;
850 ifp->state = INET6_IFADDR_STATE_DEAD;
851 spin_unlock_bh(&ifp->state_lock);
852
853 if (state == INET6_IFADDR_STATE_DEAD)
854 goto out;
855
856 spin_lock_bh(&addrconf_hash_lock);
857 hlist_del_init_rcu(&ifp->addr_lst);
858 spin_unlock_bh(&addrconf_hash_lock);
859
860 write_lock_bh(&idev->lock);
861 #ifdef CONFIG_IPV6_PRIVACY
862 if (ifp->flags&IFA_F_TEMPORARY) {
863 list_del(&ifp->tmp_list);
864 if (ifp->ifpub) {
865 in6_ifa_put(ifp->ifpub);
866 ifp->ifpub = NULL;
867 }
868 __in6_ifa_put(ifp);
869 }
870 #endif
871
872 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
873 if (ifa == ifp) {
874 list_del_init(&ifp->if_list);
875 __in6_ifa_put(ifp);
876
877 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
878 break;
879 deleted = 1;
880 continue;
881 } else if (ifp->flags & IFA_F_PERMANENT) {
882 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
883 ifp->prefix_len)) {
884 if (ifa->flags & IFA_F_PERMANENT) {
885 onlink = 1;
886 if (deleted)
887 break;
888 } else {
889 unsigned long lifetime;
890
891 if (!onlink)
892 onlink = -1;
893
894 spin_lock(&ifa->lock);
895
896 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
897 /*
898 * Note: Because this address is
899 * not permanent, lifetime <
900 * LONG_MAX / HZ here.
901 */
902 if (time_before(expires,
903 ifa->tstamp + lifetime * HZ))
904 expires = ifa->tstamp + lifetime * HZ;
905 spin_unlock(&ifa->lock);
906 }
907 }
908 }
909 }
910 write_unlock_bh(&idev->lock);
911
912 addrconf_del_timer(ifp);
913
914 ipv6_ifa_notify(RTM_DELADDR, ifp);
915
916 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
917
918 /*
919 * Purge or update corresponding prefix
920 *
921 * 1) we don't purge prefix here if address was not permanent.
922 * prefix is managed by its own lifetime.
923 * 2) if there're no addresses, delete prefix.
924 * 3) if there're still other permanent address(es),
925 * corresponding prefix is still permanent.
926 * 4) otherwise, update prefix lifetime to the
927 * longest valid lifetime among the corresponding
928 * addresses on the device.
929 * Note: subsequent RA will update lifetime.
930 *
931 * --yoshfuji
932 */
933 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
934 struct in6_addr prefix;
935 struct rt6_info *rt;
936 struct net *net = dev_net(ifp->idev->dev);
937 struct flowi6 fl6 = {};
938
939 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
940 fl6.flowi6_oif = ifp->idev->dev->ifindex;
941 fl6.daddr = prefix;
942 rt = (struct rt6_info *)ip6_route_lookup(net, &fl6,
943 RT6_LOOKUP_F_IFACE);
944
945 if (rt != net->ipv6.ip6_null_entry &&
946 addrconf_is_prefix_route(rt)) {
947 if (onlink == 0) {
948 ip6_del_rt(rt);
949 rt = NULL;
950 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
951 rt6_set_expires(rt, expires);
952 }
953 }
954 dst_release(&rt->dst);
955 }
956
957 /* clean up prefsrc entries */
958 rt6_remove_prefsrc(ifp);
959 out:
960 in6_ifa_put(ifp);
961 }
962
963 #ifdef CONFIG_IPV6_PRIVACY
964 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
965 {
966 struct inet6_dev *idev = ifp->idev;
967 struct in6_addr addr, *tmpaddr;
968 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
969 unsigned long regen_advance;
970 int tmp_plen;
971 int ret = 0;
972 int max_addresses;
973 u32 addr_flags;
974 unsigned long now = jiffies;
975
976 write_lock(&idev->lock);
977 if (ift) {
978 spin_lock_bh(&ift->lock);
979 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
980 spin_unlock_bh(&ift->lock);
981 tmpaddr = &addr;
982 } else {
983 tmpaddr = NULL;
984 }
985 retry:
986 in6_dev_hold(idev);
987 if (idev->cnf.use_tempaddr <= 0) {
988 write_unlock(&idev->lock);
989 pr_info("%s: use_tempaddr is disabled\n", __func__);
990 in6_dev_put(idev);
991 ret = -1;
992 goto out;
993 }
994 spin_lock_bh(&ifp->lock);
995 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
996 idev->cnf.use_tempaddr = -1; /*XXX*/
997 spin_unlock_bh(&ifp->lock);
998 write_unlock(&idev->lock);
999 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1000 __func__);
1001 in6_dev_put(idev);
1002 ret = -1;
1003 goto out;
1004 }
1005 in6_ifa_hold(ifp);
1006 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1007 __ipv6_try_regen_rndid(idev, tmpaddr);
1008 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1009 age = (now - ifp->tstamp) / HZ;
1010 tmp_valid_lft = min_t(__u32,
1011 ifp->valid_lft,
1012 idev->cnf.temp_valid_lft + age);
1013 tmp_prefered_lft = min_t(__u32,
1014 ifp->prefered_lft,
1015 idev->cnf.temp_prefered_lft + age -
1016 idev->cnf.max_desync_factor);
1017 tmp_plen = ifp->prefix_len;
1018 max_addresses = idev->cnf.max_addresses;
1019 tmp_tstamp = ifp->tstamp;
1020 spin_unlock_bh(&ifp->lock);
1021
1022 regen_advance = idev->cnf.regen_max_retry *
1023 idev->cnf.dad_transmits *
1024 idev->nd_parms->retrans_time / HZ;
1025 write_unlock(&idev->lock);
1026
1027 /* A temporary address is created only if this calculated Preferred
1028 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1029 * an implementation must not create a temporary address with a zero
1030 * Preferred Lifetime.
1031 */
1032 if (tmp_prefered_lft <= regen_advance) {
1033 in6_ifa_put(ifp);
1034 in6_dev_put(idev);
1035 ret = -1;
1036 goto out;
1037 }
1038
1039 addr_flags = IFA_F_TEMPORARY;
1040 /* set in addrconf_prefix_rcv() */
1041 if (ifp->flags & IFA_F_OPTIMISTIC)
1042 addr_flags |= IFA_F_OPTIMISTIC;
1043
1044 ift = !max_addresses ||
1045 ipv6_count_addresses(idev) < max_addresses ?
1046 ipv6_add_addr(idev, &addr, tmp_plen,
1047 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1048 addr_flags) : NULL;
1049 if (!ift || IS_ERR(ift)) {
1050 in6_ifa_put(ifp);
1051 in6_dev_put(idev);
1052 pr_info("%s: retry temporary address regeneration\n", __func__);
1053 tmpaddr = &addr;
1054 write_lock(&idev->lock);
1055 goto retry;
1056 }
1057
1058 spin_lock_bh(&ift->lock);
1059 ift->ifpub = ifp;
1060 ift->valid_lft = tmp_valid_lft;
1061 ift->prefered_lft = tmp_prefered_lft;
1062 ift->cstamp = now;
1063 ift->tstamp = tmp_tstamp;
1064 spin_unlock_bh(&ift->lock);
1065
1066 addrconf_dad_start(ift);
1067 in6_ifa_put(ift);
1068 in6_dev_put(idev);
1069 out:
1070 return ret;
1071 }
1072 #endif
1073
1074 /*
1075 * Choose an appropriate source address (RFC3484)
1076 */
1077 enum {
1078 IPV6_SADDR_RULE_INIT = 0,
1079 IPV6_SADDR_RULE_LOCAL,
1080 IPV6_SADDR_RULE_SCOPE,
1081 IPV6_SADDR_RULE_PREFERRED,
1082 #ifdef CONFIG_IPV6_MIP6
1083 IPV6_SADDR_RULE_HOA,
1084 #endif
1085 IPV6_SADDR_RULE_OIF,
1086 IPV6_SADDR_RULE_LABEL,
1087 #ifdef CONFIG_IPV6_PRIVACY
1088 IPV6_SADDR_RULE_PRIVACY,
1089 #endif
1090 IPV6_SADDR_RULE_ORCHID,
1091 IPV6_SADDR_RULE_PREFIX,
1092 IPV6_SADDR_RULE_MAX
1093 };
1094
1095 struct ipv6_saddr_score {
1096 int rule;
1097 int addr_type;
1098 struct inet6_ifaddr *ifa;
1099 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1100 int scopedist;
1101 int matchlen;
1102 };
1103
1104 struct ipv6_saddr_dst {
1105 const struct in6_addr *addr;
1106 int ifindex;
1107 int scope;
1108 int label;
1109 unsigned int prefs;
1110 };
1111
1112 static inline int ipv6_saddr_preferred(int type)
1113 {
1114 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1115 return 1;
1116 return 0;
1117 }
1118
1119 static int ipv6_get_saddr_eval(struct net *net,
1120 struct ipv6_saddr_score *score,
1121 struct ipv6_saddr_dst *dst,
1122 int i)
1123 {
1124 int ret;
1125
1126 if (i <= score->rule) {
1127 switch (i) {
1128 case IPV6_SADDR_RULE_SCOPE:
1129 ret = score->scopedist;
1130 break;
1131 case IPV6_SADDR_RULE_PREFIX:
1132 ret = score->matchlen;
1133 break;
1134 default:
1135 ret = !!test_bit(i, score->scorebits);
1136 }
1137 goto out;
1138 }
1139
1140 switch (i) {
1141 case IPV6_SADDR_RULE_INIT:
1142 /* Rule 0: remember if hiscore is not ready yet */
1143 ret = !!score->ifa;
1144 break;
1145 case IPV6_SADDR_RULE_LOCAL:
1146 /* Rule 1: Prefer same address */
1147 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1148 break;
1149 case IPV6_SADDR_RULE_SCOPE:
1150 /* Rule 2: Prefer appropriate scope
1151 *
1152 * ret
1153 * ^
1154 * -1 | d 15
1155 * ---+--+-+---> scope
1156 * |
1157 * | d is scope of the destination.
1158 * B-d | \
1159 * | \ <- smaller scope is better if
1160 * B-15 | \ if scope is enough for destinaion.
1161 * | ret = B - scope (-1 <= scope >= d <= 15).
1162 * d-C-1 | /
1163 * |/ <- greater is better
1164 * -C / if scope is not enough for destination.
1165 * /| ret = scope - C (-1 <= d < scope <= 15).
1166 *
1167 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1168 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1169 * Assume B = 0 and we get C > 29.
1170 */
1171 ret = __ipv6_addr_src_scope(score->addr_type);
1172 if (ret >= dst->scope)
1173 ret = -ret;
1174 else
1175 ret -= 128; /* 30 is enough */
1176 score->scopedist = ret;
1177 break;
1178 case IPV6_SADDR_RULE_PREFERRED:
1179 /* Rule 3: Avoid deprecated and optimistic addresses */
1180 ret = ipv6_saddr_preferred(score->addr_type) ||
1181 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1182 break;
1183 #ifdef CONFIG_IPV6_MIP6
1184 case IPV6_SADDR_RULE_HOA:
1185 {
1186 /* Rule 4: Prefer home address */
1187 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1188 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1189 break;
1190 }
1191 #endif
1192 case IPV6_SADDR_RULE_OIF:
1193 /* Rule 5: Prefer outgoing interface */
1194 ret = (!dst->ifindex ||
1195 dst->ifindex == score->ifa->idev->dev->ifindex);
1196 break;
1197 case IPV6_SADDR_RULE_LABEL:
1198 /* Rule 6: Prefer matching label */
1199 ret = ipv6_addr_label(net,
1200 &score->ifa->addr, score->addr_type,
1201 score->ifa->idev->dev->ifindex) == dst->label;
1202 break;
1203 #ifdef CONFIG_IPV6_PRIVACY
1204 case IPV6_SADDR_RULE_PRIVACY:
1205 {
1206 /* Rule 7: Prefer public address
1207 * Note: prefer temporary address if use_tempaddr >= 2
1208 */
1209 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1210 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1211 score->ifa->idev->cnf.use_tempaddr >= 2;
1212 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1213 break;
1214 }
1215 #endif
1216 case IPV6_SADDR_RULE_ORCHID:
1217 /* Rule 8-: Prefer ORCHID vs ORCHID or
1218 * non-ORCHID vs non-ORCHID
1219 */
1220 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1221 ipv6_addr_orchid(dst->addr));
1222 break;
1223 case IPV6_SADDR_RULE_PREFIX:
1224 /* Rule 8: Use longest matching prefix */
1225 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1226 if (ret > score->ifa->prefix_len)
1227 ret = score->ifa->prefix_len;
1228 score->matchlen = ret;
1229 break;
1230 default:
1231 ret = 0;
1232 }
1233
1234 if (ret)
1235 __set_bit(i, score->scorebits);
1236 score->rule = i;
1237 out:
1238 return ret;
1239 }
1240
1241 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1242 const struct in6_addr *daddr, unsigned int prefs,
1243 struct in6_addr *saddr)
1244 {
1245 struct ipv6_saddr_score scores[2],
1246 *score = &scores[0], *hiscore = &scores[1];
1247 struct ipv6_saddr_dst dst;
1248 struct net_device *dev;
1249 int dst_type;
1250
1251 dst_type = __ipv6_addr_type(daddr);
1252 dst.addr = daddr;
1253 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1254 dst.scope = __ipv6_addr_src_scope(dst_type);
1255 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1256 dst.prefs = prefs;
1257
1258 hiscore->rule = -1;
1259 hiscore->ifa = NULL;
1260
1261 rcu_read_lock();
1262
1263 for_each_netdev_rcu(net, dev) {
1264 struct inet6_dev *idev;
1265
1266 /* Candidate Source Address (section 4)
1267 * - multicast and link-local destination address,
1268 * the set of candidate source address MUST only
1269 * include addresses assigned to interfaces
1270 * belonging to the same link as the outgoing
1271 * interface.
1272 * (- For site-local destination addresses, the
1273 * set of candidate source addresses MUST only
1274 * include addresses assigned to interfaces
1275 * belonging to the same site as the outgoing
1276 * interface.)
1277 */
1278 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1279 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1280 dst.ifindex && dev->ifindex != dst.ifindex)
1281 continue;
1282
1283 idev = __in6_dev_get(dev);
1284 if (!idev)
1285 continue;
1286
1287 read_lock_bh(&idev->lock);
1288 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1289 int i;
1290
1291 /*
1292 * - Tentative Address (RFC2462 section 5.4)
1293 * - A tentative address is not considered
1294 * "assigned to an interface" in the traditional
1295 * sense, unless it is also flagged as optimistic.
1296 * - Candidate Source Address (section 4)
1297 * - In any case, anycast addresses, multicast
1298 * addresses, and the unspecified address MUST
1299 * NOT be included in a candidate set.
1300 */
1301 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1302 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1303 continue;
1304
1305 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1306
1307 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1308 score->addr_type & IPV6_ADDR_MULTICAST)) {
1309 LIMIT_NETDEBUG(KERN_DEBUG
1310 "ADDRCONF: unspecified / multicast address "
1311 "assigned as unicast address on %s",
1312 dev->name);
1313 continue;
1314 }
1315
1316 score->rule = -1;
1317 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1318
1319 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1320 int minihiscore, miniscore;
1321
1322 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1323 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1324
1325 if (minihiscore > miniscore) {
1326 if (i == IPV6_SADDR_RULE_SCOPE &&
1327 score->scopedist > 0) {
1328 /*
1329 * special case:
1330 * each remaining entry
1331 * has too small (not enough)
1332 * scope, because ifa entries
1333 * are sorted by their scope
1334 * values.
1335 */
1336 goto try_nextdev;
1337 }
1338 break;
1339 } else if (minihiscore < miniscore) {
1340 if (hiscore->ifa)
1341 in6_ifa_put(hiscore->ifa);
1342
1343 in6_ifa_hold(score->ifa);
1344
1345 swap(hiscore, score);
1346
1347 /* restore our iterator */
1348 score->ifa = hiscore->ifa;
1349
1350 break;
1351 }
1352 }
1353 }
1354 try_nextdev:
1355 read_unlock_bh(&idev->lock);
1356 }
1357 rcu_read_unlock();
1358
1359 if (!hiscore->ifa)
1360 return -EADDRNOTAVAIL;
1361
1362 *saddr = hiscore->ifa->addr;
1363 in6_ifa_put(hiscore->ifa);
1364 return 0;
1365 }
1366 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1367
1368 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1369 unsigned char banned_flags)
1370 {
1371 struct inet6_dev *idev;
1372 int err = -EADDRNOTAVAIL;
1373
1374 rcu_read_lock();
1375 idev = __in6_dev_get(dev);
1376 if (idev) {
1377 struct inet6_ifaddr *ifp;
1378
1379 read_lock_bh(&idev->lock);
1380 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1381 if (ifp->scope == IFA_LINK &&
1382 !(ifp->flags & banned_flags)) {
1383 *addr = ifp->addr;
1384 err = 0;
1385 break;
1386 }
1387 }
1388 read_unlock_bh(&idev->lock);
1389 }
1390 rcu_read_unlock();
1391 return err;
1392 }
1393
1394 static int ipv6_count_addresses(struct inet6_dev *idev)
1395 {
1396 int cnt = 0;
1397 struct inet6_ifaddr *ifp;
1398
1399 read_lock_bh(&idev->lock);
1400 list_for_each_entry(ifp, &idev->addr_list, if_list)
1401 cnt++;
1402 read_unlock_bh(&idev->lock);
1403 return cnt;
1404 }
1405
1406 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1407 struct net_device *dev, int strict)
1408 {
1409 struct inet6_ifaddr *ifp;
1410 struct hlist_node *node;
1411 unsigned int hash = inet6_addr_hash(addr);
1412
1413 rcu_read_lock_bh();
1414 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1415 if (!net_eq(dev_net(ifp->idev->dev), net))
1416 continue;
1417 if (ipv6_addr_equal(&ifp->addr, addr) &&
1418 !(ifp->flags&IFA_F_TENTATIVE) &&
1419 (dev == NULL || ifp->idev->dev == dev ||
1420 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1421 rcu_read_unlock_bh();
1422 return 1;
1423 }
1424 }
1425
1426 rcu_read_unlock_bh();
1427 return 0;
1428 }
1429 EXPORT_SYMBOL(ipv6_chk_addr);
1430
1431 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1432 struct net_device *dev)
1433 {
1434 unsigned int hash = inet6_addr_hash(addr);
1435 struct inet6_ifaddr *ifp;
1436 struct hlist_node *node;
1437
1438 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1439 if (!net_eq(dev_net(ifp->idev->dev), net))
1440 continue;
1441 if (ipv6_addr_equal(&ifp->addr, addr)) {
1442 if (dev == NULL || ifp->idev->dev == dev)
1443 return true;
1444 }
1445 }
1446 return false;
1447 }
1448
1449 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1450 {
1451 struct inet6_dev *idev;
1452 struct inet6_ifaddr *ifa;
1453 int onlink;
1454
1455 onlink = 0;
1456 rcu_read_lock();
1457 idev = __in6_dev_get(dev);
1458 if (idev) {
1459 read_lock_bh(&idev->lock);
1460 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1461 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1462 ifa->prefix_len);
1463 if (onlink)
1464 break;
1465 }
1466 read_unlock_bh(&idev->lock);
1467 }
1468 rcu_read_unlock();
1469 return onlink;
1470 }
1471 EXPORT_SYMBOL(ipv6_chk_prefix);
1472
1473 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1474 struct net_device *dev, int strict)
1475 {
1476 struct inet6_ifaddr *ifp, *result = NULL;
1477 unsigned int hash = inet6_addr_hash(addr);
1478 struct hlist_node *node;
1479
1480 rcu_read_lock_bh();
1481 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1482 if (!net_eq(dev_net(ifp->idev->dev), net))
1483 continue;
1484 if (ipv6_addr_equal(&ifp->addr, addr)) {
1485 if (dev == NULL || ifp->idev->dev == dev ||
1486 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1487 result = ifp;
1488 in6_ifa_hold(ifp);
1489 break;
1490 }
1491 }
1492 }
1493 rcu_read_unlock_bh();
1494
1495 return result;
1496 }
1497
1498 /* Gets referenced address, destroys ifaddr */
1499
1500 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1501 {
1502 if (ifp->flags&IFA_F_PERMANENT) {
1503 spin_lock_bh(&ifp->lock);
1504 addrconf_del_timer(ifp);
1505 ifp->flags |= IFA_F_TENTATIVE;
1506 if (dad_failed)
1507 ifp->flags |= IFA_F_DADFAILED;
1508 spin_unlock_bh(&ifp->lock);
1509 if (dad_failed)
1510 ipv6_ifa_notify(0, ifp);
1511 in6_ifa_put(ifp);
1512 #ifdef CONFIG_IPV6_PRIVACY
1513 } else if (ifp->flags&IFA_F_TEMPORARY) {
1514 struct inet6_ifaddr *ifpub;
1515 spin_lock_bh(&ifp->lock);
1516 ifpub = ifp->ifpub;
1517 if (ifpub) {
1518 in6_ifa_hold(ifpub);
1519 spin_unlock_bh(&ifp->lock);
1520 ipv6_create_tempaddr(ifpub, ifp);
1521 in6_ifa_put(ifpub);
1522 } else {
1523 spin_unlock_bh(&ifp->lock);
1524 }
1525 ipv6_del_addr(ifp);
1526 #endif
1527 } else
1528 ipv6_del_addr(ifp);
1529 }
1530
1531 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1532 {
1533 int err = -ENOENT;
1534
1535 spin_lock(&ifp->state_lock);
1536 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1537 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1538 err = 0;
1539 }
1540 spin_unlock(&ifp->state_lock);
1541
1542 return err;
1543 }
1544
1545 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1546 {
1547 struct inet6_dev *idev = ifp->idev;
1548
1549 if (addrconf_dad_end(ifp)) {
1550 in6_ifa_put(ifp);
1551 return;
1552 }
1553
1554 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1555 ifp->idev->dev->name, &ifp->addr);
1556
1557 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1558 struct in6_addr addr;
1559
1560 addr.s6_addr32[0] = htonl(0xfe800000);
1561 addr.s6_addr32[1] = 0;
1562
1563 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1564 ipv6_addr_equal(&ifp->addr, &addr)) {
1565 /* DAD failed for link-local based on MAC address */
1566 idev->cnf.disable_ipv6 = 1;
1567
1568 pr_info("%s: IPv6 being disabled!\n",
1569 ifp->idev->dev->name);
1570 }
1571 }
1572
1573 addrconf_dad_stop(ifp, 1);
1574 }
1575
1576 /* Join to solicited addr multicast group. */
1577
1578 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1579 {
1580 struct in6_addr maddr;
1581
1582 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1583 return;
1584
1585 addrconf_addr_solict_mult(addr, &maddr);
1586 ipv6_dev_mc_inc(dev, &maddr);
1587 }
1588
1589 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1590 {
1591 struct in6_addr maddr;
1592
1593 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1594 return;
1595
1596 addrconf_addr_solict_mult(addr, &maddr);
1597 __ipv6_dev_mc_dec(idev, &maddr);
1598 }
1599
1600 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1601 {
1602 struct in6_addr addr;
1603 if (ifp->prefix_len == 127) /* RFC 6164 */
1604 return;
1605 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1606 if (ipv6_addr_any(&addr))
1607 return;
1608 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1609 }
1610
1611 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1612 {
1613 struct in6_addr addr;
1614 if (ifp->prefix_len == 127) /* RFC 6164 */
1615 return;
1616 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1617 if (ipv6_addr_any(&addr))
1618 return;
1619 __ipv6_dev_ac_dec(ifp->idev, &addr);
1620 }
1621
1622 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1623 {
1624 if (dev->addr_len != ETH_ALEN)
1625 return -1;
1626 memcpy(eui, dev->dev_addr, 3);
1627 memcpy(eui + 5, dev->dev_addr + 3, 3);
1628
1629 /*
1630 * The zSeries OSA network cards can be shared among various
1631 * OS instances, but the OSA cards have only one MAC address.
1632 * This leads to duplicate address conflicts in conjunction
1633 * with IPv6 if more than one instance uses the same card.
1634 *
1635 * The driver for these cards can deliver a unique 16-bit
1636 * identifier for each instance sharing the same card. It is
1637 * placed instead of 0xFFFE in the interface identifier. The
1638 * "u" bit of the interface identifier is not inverted in this
1639 * case. Hence the resulting interface identifier has local
1640 * scope according to RFC2373.
1641 */
1642 if (dev->dev_id) {
1643 eui[3] = (dev->dev_id >> 8) & 0xFF;
1644 eui[4] = dev->dev_id & 0xFF;
1645 } else {
1646 eui[3] = 0xFF;
1647 eui[4] = 0xFE;
1648 eui[0] ^= 2;
1649 }
1650 return 0;
1651 }
1652
1653 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1654 {
1655 if (dev->addr_len != IEEE802154_ADDR_LEN)
1656 return -1;
1657 memcpy(eui, dev->dev_addr, 8);
1658 return 0;
1659 }
1660
1661 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1662 {
1663 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1664 if (dev->addr_len != ARCNET_ALEN)
1665 return -1;
1666 memset(eui, 0, 7);
1667 eui[7] = *(u8 *)dev->dev_addr;
1668 return 0;
1669 }
1670
1671 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1672 {
1673 if (dev->addr_len != INFINIBAND_ALEN)
1674 return -1;
1675 memcpy(eui, dev->dev_addr + 12, 8);
1676 eui[0] |= 2;
1677 return 0;
1678 }
1679
1680 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1681 {
1682 if (addr == 0)
1683 return -1;
1684 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1685 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1686 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1687 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1688 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1689 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1690 eui[1] = 0;
1691 eui[2] = 0x5E;
1692 eui[3] = 0xFE;
1693 memcpy(eui + 4, &addr, 4);
1694 return 0;
1695 }
1696
1697 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1698 {
1699 if (dev->priv_flags & IFF_ISATAP)
1700 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1701 return -1;
1702 }
1703
1704 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1705 {
1706 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1707 }
1708
1709 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1710 {
1711 switch (dev->type) {
1712 case ARPHRD_ETHER:
1713 case ARPHRD_FDDI:
1714 return addrconf_ifid_eui48(eui, dev);
1715 case ARPHRD_ARCNET:
1716 return addrconf_ifid_arcnet(eui, dev);
1717 case ARPHRD_INFINIBAND:
1718 return addrconf_ifid_infiniband(eui, dev);
1719 case ARPHRD_SIT:
1720 return addrconf_ifid_sit(eui, dev);
1721 case ARPHRD_IPGRE:
1722 return addrconf_ifid_gre(eui, dev);
1723 case ARPHRD_IEEE802154:
1724 return addrconf_ifid_eui64(eui, dev);
1725 }
1726 return -1;
1727 }
1728
1729 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1730 {
1731 int err = -1;
1732 struct inet6_ifaddr *ifp;
1733
1734 read_lock_bh(&idev->lock);
1735 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1736 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1737 memcpy(eui, ifp->addr.s6_addr+8, 8);
1738 err = 0;
1739 break;
1740 }
1741 }
1742 read_unlock_bh(&idev->lock);
1743 return err;
1744 }
1745
1746 #ifdef CONFIG_IPV6_PRIVACY
1747 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1748 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1749 {
1750 regen:
1751 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1752 idev->rndid[0] &= ~0x02;
1753
1754 /*
1755 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1756 * check if generated address is not inappropriate
1757 *
1758 * - Reserved subnet anycast (RFC 2526)
1759 * 11111101 11....11 1xxxxxxx
1760 * - ISATAP (RFC4214) 6.1
1761 * 00-00-5E-FE-xx-xx-xx-xx
1762 * - value 0
1763 * - XXX: already assigned to an address on the device
1764 */
1765 if (idev->rndid[0] == 0xfd &&
1766 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1767 (idev->rndid[7]&0x80))
1768 goto regen;
1769 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1770 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1771 goto regen;
1772 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1773 goto regen;
1774 }
1775 }
1776
1777 static void ipv6_regen_rndid(unsigned long data)
1778 {
1779 struct inet6_dev *idev = (struct inet6_dev *) data;
1780 unsigned long expires;
1781
1782 rcu_read_lock_bh();
1783 write_lock_bh(&idev->lock);
1784
1785 if (idev->dead)
1786 goto out;
1787
1788 __ipv6_regen_rndid(idev);
1789
1790 expires = jiffies +
1791 idev->cnf.temp_prefered_lft * HZ -
1792 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1793 idev->cnf.max_desync_factor * HZ;
1794 if (time_before(expires, jiffies)) {
1795 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1796 __func__, idev->dev->name);
1797 goto out;
1798 }
1799
1800 if (!mod_timer(&idev->regen_timer, expires))
1801 in6_dev_hold(idev);
1802
1803 out:
1804 write_unlock_bh(&idev->lock);
1805 rcu_read_unlock_bh();
1806 in6_dev_put(idev);
1807 }
1808
1809 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1810 {
1811 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1812 __ipv6_regen_rndid(idev);
1813 }
1814 #endif
1815
1816 /*
1817 * Add prefix route.
1818 */
1819
1820 static void
1821 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1822 unsigned long expires, u32 flags)
1823 {
1824 struct fib6_config cfg = {
1825 .fc_table = RT6_TABLE_PREFIX,
1826 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1827 .fc_ifindex = dev->ifindex,
1828 .fc_expires = expires,
1829 .fc_dst_len = plen,
1830 .fc_flags = RTF_UP | flags,
1831 .fc_nlinfo.nl_net = dev_net(dev),
1832 .fc_protocol = RTPROT_KERNEL,
1833 };
1834
1835 cfg.fc_dst = *pfx;
1836
1837 /* Prevent useless cloning on PtP SIT.
1838 This thing is done here expecting that the whole
1839 class of non-broadcast devices need not cloning.
1840 */
1841 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1842 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1843 cfg.fc_flags |= RTF_NONEXTHOP;
1844 #endif
1845
1846 ip6_route_add(&cfg);
1847 }
1848
1849
1850 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1851 int plen,
1852 const struct net_device *dev,
1853 u32 flags, u32 noflags)
1854 {
1855 struct fib6_node *fn;
1856 struct rt6_info *rt = NULL;
1857 struct fib6_table *table;
1858
1859 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1860 if (table == NULL)
1861 return NULL;
1862
1863 read_lock_bh(&table->tb6_lock);
1864 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1865 if (!fn)
1866 goto out;
1867 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1868 if (rt->dst.dev->ifindex != dev->ifindex)
1869 continue;
1870 if ((rt->rt6i_flags & flags) != flags)
1871 continue;
1872 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1873 continue;
1874 dst_hold(&rt->dst);
1875 break;
1876 }
1877 out:
1878 read_unlock_bh(&table->tb6_lock);
1879 return rt;
1880 }
1881
1882
1883 /* Create "default" multicast route to the interface */
1884
1885 static void addrconf_add_mroute(struct net_device *dev)
1886 {
1887 struct fib6_config cfg = {
1888 .fc_table = RT6_TABLE_LOCAL,
1889 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1890 .fc_ifindex = dev->ifindex,
1891 .fc_dst_len = 8,
1892 .fc_flags = RTF_UP,
1893 .fc_nlinfo.nl_net = dev_net(dev),
1894 };
1895
1896 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1897
1898 ip6_route_add(&cfg);
1899 }
1900
1901 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
1902 static void sit_route_add(struct net_device *dev)
1903 {
1904 struct fib6_config cfg = {
1905 .fc_table = RT6_TABLE_MAIN,
1906 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1907 .fc_ifindex = dev->ifindex,
1908 .fc_dst_len = 96,
1909 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1910 .fc_nlinfo.nl_net = dev_net(dev),
1911 };
1912
1913 /* prefix length - 96 bits "::d.d.d.d" */
1914 ip6_route_add(&cfg);
1915 }
1916 #endif
1917
1918 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1919 {
1920 struct inet6_dev *idev;
1921
1922 ASSERT_RTNL();
1923
1924 idev = ipv6_find_idev(dev);
1925 if (!idev)
1926 return ERR_PTR(-ENOBUFS);
1927
1928 if (idev->cnf.disable_ipv6)
1929 return ERR_PTR(-EACCES);
1930
1931 /* Add default multicast route */
1932 if (!(dev->flags & IFF_LOOPBACK))
1933 addrconf_add_mroute(dev);
1934
1935 return idev;
1936 }
1937
1938 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1939 {
1940 struct prefix_info *pinfo;
1941 __u32 valid_lft;
1942 __u32 prefered_lft;
1943 int addr_type;
1944 struct inet6_dev *in6_dev;
1945 struct net *net = dev_net(dev);
1946
1947 pinfo = (struct prefix_info *) opt;
1948
1949 if (len < sizeof(struct prefix_info)) {
1950 ADBG(("addrconf: prefix option too short\n"));
1951 return;
1952 }
1953
1954 /*
1955 * Validation checks ([ADDRCONF], page 19)
1956 */
1957
1958 addr_type = ipv6_addr_type(&pinfo->prefix);
1959
1960 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1961 return;
1962
1963 valid_lft = ntohl(pinfo->valid);
1964 prefered_lft = ntohl(pinfo->prefered);
1965
1966 if (prefered_lft > valid_lft) {
1967 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1968 return;
1969 }
1970
1971 in6_dev = in6_dev_get(dev);
1972
1973 if (in6_dev == NULL) {
1974 net_dbg_ratelimited("addrconf: device %s not configured\n",
1975 dev->name);
1976 return;
1977 }
1978
1979 /*
1980 * Two things going on here:
1981 * 1) Add routes for on-link prefixes
1982 * 2) Configure prefixes with the auto flag set
1983 */
1984
1985 if (pinfo->onlink) {
1986 struct rt6_info *rt;
1987 unsigned long rt_expires;
1988
1989 /* Avoid arithmetic overflow. Really, we could
1990 * save rt_expires in seconds, likely valid_lft,
1991 * but it would require division in fib gc, that it
1992 * not good.
1993 */
1994 if (HZ > USER_HZ)
1995 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
1996 else
1997 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
1998
1999 if (addrconf_finite_timeout(rt_expires))
2000 rt_expires *= HZ;
2001
2002 rt = addrconf_get_prefix_route(&pinfo->prefix,
2003 pinfo->prefix_len,
2004 dev,
2005 RTF_ADDRCONF | RTF_PREFIX_RT,
2006 RTF_GATEWAY | RTF_DEFAULT);
2007
2008 if (rt) {
2009 /* Autoconf prefix route */
2010 if (valid_lft == 0) {
2011 ip6_del_rt(rt);
2012 rt = NULL;
2013 } else if (addrconf_finite_timeout(rt_expires)) {
2014 /* not infinity */
2015 rt6_set_expires(rt, jiffies + rt_expires);
2016 } else {
2017 rt6_clean_expires(rt);
2018 }
2019 } else if (valid_lft) {
2020 clock_t expires = 0;
2021 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2022 if (addrconf_finite_timeout(rt_expires)) {
2023 /* not infinity */
2024 flags |= RTF_EXPIRES;
2025 expires = jiffies_to_clock_t(rt_expires);
2026 }
2027 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2028 dev, expires, flags);
2029 }
2030 if (rt)
2031 dst_release(&rt->dst);
2032 }
2033
2034 /* Try to figure out our local address for this prefix */
2035
2036 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2037 struct inet6_ifaddr *ifp;
2038 struct in6_addr addr;
2039 int create = 0, update_lft = 0;
2040
2041 if (pinfo->prefix_len == 64) {
2042 memcpy(&addr, &pinfo->prefix, 8);
2043 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2044 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2045 in6_dev_put(in6_dev);
2046 return;
2047 }
2048 goto ok;
2049 }
2050 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2051 pinfo->prefix_len);
2052 in6_dev_put(in6_dev);
2053 return;
2054
2055 ok:
2056
2057 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2058
2059 if (ifp == NULL && valid_lft) {
2060 int max_addresses = in6_dev->cnf.max_addresses;
2061 u32 addr_flags = 0;
2062
2063 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2064 if (in6_dev->cnf.optimistic_dad &&
2065 !net->ipv6.devconf_all->forwarding && sllao)
2066 addr_flags = IFA_F_OPTIMISTIC;
2067 #endif
2068
2069 /* Do not allow to create too much of autoconfigured
2070 * addresses; this would be too easy way to crash kernel.
2071 */
2072 if (!max_addresses ||
2073 ipv6_count_addresses(in6_dev) < max_addresses)
2074 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
2075 addr_type&IPV6_ADDR_SCOPE_MASK,
2076 addr_flags);
2077
2078 if (!ifp || IS_ERR(ifp)) {
2079 in6_dev_put(in6_dev);
2080 return;
2081 }
2082
2083 update_lft = create = 1;
2084 ifp->cstamp = jiffies;
2085 addrconf_dad_start(ifp);
2086 }
2087
2088 if (ifp) {
2089 int flags;
2090 unsigned long now;
2091 #ifdef CONFIG_IPV6_PRIVACY
2092 struct inet6_ifaddr *ift;
2093 #endif
2094 u32 stored_lft;
2095
2096 /* update lifetime (RFC2462 5.5.3 e) */
2097 spin_lock(&ifp->lock);
2098 now = jiffies;
2099 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2100 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2101 else
2102 stored_lft = 0;
2103 if (!update_lft && stored_lft) {
2104 if (valid_lft > MIN_VALID_LIFETIME ||
2105 valid_lft > stored_lft)
2106 update_lft = 1;
2107 else if (stored_lft <= MIN_VALID_LIFETIME) {
2108 /* valid_lft <= stored_lft is always true */
2109 /*
2110 * RFC 4862 Section 5.5.3e:
2111 * "Note that the preferred lifetime of
2112 * the corresponding address is always
2113 * reset to the Preferred Lifetime in
2114 * the received Prefix Information
2115 * option, regardless of whether the
2116 * valid lifetime is also reset or
2117 * ignored."
2118 *
2119 * So if the preferred lifetime in
2120 * this advertisement is different
2121 * than what we have stored, but the
2122 * valid lifetime is invalid, just
2123 * reset prefered_lft.
2124 *
2125 * We must set the valid lifetime
2126 * to the stored lifetime since we'll
2127 * be updating the timestamp below,
2128 * else we'll set it back to the
2129 * minimum.
2130 */
2131 if (prefered_lft != ifp->prefered_lft) {
2132 valid_lft = stored_lft;
2133 update_lft = 1;
2134 }
2135 } else {
2136 valid_lft = MIN_VALID_LIFETIME;
2137 if (valid_lft < prefered_lft)
2138 prefered_lft = valid_lft;
2139 update_lft = 1;
2140 }
2141 }
2142
2143 if (update_lft) {
2144 ifp->valid_lft = valid_lft;
2145 ifp->prefered_lft = prefered_lft;
2146 ifp->tstamp = now;
2147 flags = ifp->flags;
2148 ifp->flags &= ~IFA_F_DEPRECATED;
2149 spin_unlock(&ifp->lock);
2150
2151 if (!(flags&IFA_F_TENTATIVE))
2152 ipv6_ifa_notify(0, ifp);
2153 } else
2154 spin_unlock(&ifp->lock);
2155
2156 #ifdef CONFIG_IPV6_PRIVACY
2157 read_lock_bh(&in6_dev->lock);
2158 /* update all temporary addresses in the list */
2159 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2160 tmp_list) {
2161 int age, max_valid, max_prefered;
2162
2163 if (ifp != ift->ifpub)
2164 continue;
2165
2166 /*
2167 * RFC 4941 section 3.3:
2168 * If a received option will extend the lifetime
2169 * of a public address, the lifetimes of
2170 * temporary addresses should be extended,
2171 * subject to the overall constraint that no
2172 * temporary addresses should ever remain
2173 * "valid" or "preferred" for a time longer than
2174 * (TEMP_VALID_LIFETIME) or
2175 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2176 * respectively.
2177 */
2178 age = (now - ift->cstamp) / HZ;
2179 max_valid = in6_dev->cnf.temp_valid_lft - age;
2180 if (max_valid < 0)
2181 max_valid = 0;
2182
2183 max_prefered = in6_dev->cnf.temp_prefered_lft -
2184 in6_dev->cnf.max_desync_factor -
2185 age;
2186 if (max_prefered < 0)
2187 max_prefered = 0;
2188
2189 if (valid_lft > max_valid)
2190 valid_lft = max_valid;
2191
2192 if (prefered_lft > max_prefered)
2193 prefered_lft = max_prefered;
2194
2195 spin_lock(&ift->lock);
2196 flags = ift->flags;
2197 ift->valid_lft = valid_lft;
2198 ift->prefered_lft = prefered_lft;
2199 ift->tstamp = now;
2200 if (prefered_lft > 0)
2201 ift->flags &= ~IFA_F_DEPRECATED;
2202
2203 spin_unlock(&ift->lock);
2204 if (!(flags&IFA_F_TENTATIVE))
2205 ipv6_ifa_notify(0, ift);
2206 }
2207
2208 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2209 /*
2210 * When a new public address is created as
2211 * described in [ADDRCONF], also create a new
2212 * temporary address. Also create a temporary
2213 * address if it's enabled but no temporary
2214 * address currently exists.
2215 */
2216 read_unlock_bh(&in6_dev->lock);
2217 ipv6_create_tempaddr(ifp, NULL);
2218 } else {
2219 read_unlock_bh(&in6_dev->lock);
2220 }
2221 #endif
2222 in6_ifa_put(ifp);
2223 addrconf_verify(0);
2224 }
2225 }
2226 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2227 in6_dev_put(in6_dev);
2228 }
2229
2230 /*
2231 * Set destination address.
2232 * Special case for SIT interfaces where we create a new "virtual"
2233 * device.
2234 */
2235 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2236 {
2237 struct in6_ifreq ireq;
2238 struct net_device *dev;
2239 int err = -EINVAL;
2240
2241 rtnl_lock();
2242
2243 err = -EFAULT;
2244 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2245 goto err_exit;
2246
2247 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2248
2249 err = -ENODEV;
2250 if (dev == NULL)
2251 goto err_exit;
2252
2253 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2254 if (dev->type == ARPHRD_SIT) {
2255 const struct net_device_ops *ops = dev->netdev_ops;
2256 struct ifreq ifr;
2257 struct ip_tunnel_parm p;
2258
2259 err = -EADDRNOTAVAIL;
2260 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2261 goto err_exit;
2262
2263 memset(&p, 0, sizeof(p));
2264 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2265 p.iph.saddr = 0;
2266 p.iph.version = 4;
2267 p.iph.ihl = 5;
2268 p.iph.protocol = IPPROTO_IPV6;
2269 p.iph.ttl = 64;
2270 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2271
2272 if (ops->ndo_do_ioctl) {
2273 mm_segment_t oldfs = get_fs();
2274
2275 set_fs(KERNEL_DS);
2276 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2277 set_fs(oldfs);
2278 } else
2279 err = -EOPNOTSUPP;
2280
2281 if (err == 0) {
2282 err = -ENOBUFS;
2283 dev = __dev_get_by_name(net, p.name);
2284 if (!dev)
2285 goto err_exit;
2286 err = dev_open(dev);
2287 }
2288 }
2289 #endif
2290
2291 err_exit:
2292 rtnl_unlock();
2293 return err;
2294 }
2295
2296 /*
2297 * Manual configuration of address on an interface
2298 */
2299 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2300 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2301 __u32 valid_lft)
2302 {
2303 struct inet6_ifaddr *ifp;
2304 struct inet6_dev *idev;
2305 struct net_device *dev;
2306 int scope;
2307 u32 flags;
2308 clock_t expires;
2309 unsigned long timeout;
2310
2311 ASSERT_RTNL();
2312
2313 if (plen > 128)
2314 return -EINVAL;
2315
2316 /* check the lifetime */
2317 if (!valid_lft || prefered_lft > valid_lft)
2318 return -EINVAL;
2319
2320 dev = __dev_get_by_index(net, ifindex);
2321 if (!dev)
2322 return -ENODEV;
2323
2324 idev = addrconf_add_dev(dev);
2325 if (IS_ERR(idev))
2326 return PTR_ERR(idev);
2327
2328 scope = ipv6_addr_scope(pfx);
2329
2330 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2331 if (addrconf_finite_timeout(timeout)) {
2332 expires = jiffies_to_clock_t(timeout * HZ);
2333 valid_lft = timeout;
2334 flags = RTF_EXPIRES;
2335 } else {
2336 expires = 0;
2337 flags = 0;
2338 ifa_flags |= IFA_F_PERMANENT;
2339 }
2340
2341 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2342 if (addrconf_finite_timeout(timeout)) {
2343 if (timeout == 0)
2344 ifa_flags |= IFA_F_DEPRECATED;
2345 prefered_lft = timeout;
2346 }
2347
2348 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2349
2350 if (!IS_ERR(ifp)) {
2351 spin_lock_bh(&ifp->lock);
2352 ifp->valid_lft = valid_lft;
2353 ifp->prefered_lft = prefered_lft;
2354 ifp->tstamp = jiffies;
2355 spin_unlock_bh(&ifp->lock);
2356
2357 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2358 expires, flags);
2359 /*
2360 * Note that section 3.1 of RFC 4429 indicates
2361 * that the Optimistic flag should not be set for
2362 * manually configured addresses
2363 */
2364 addrconf_dad_start(ifp);
2365 in6_ifa_put(ifp);
2366 addrconf_verify(0);
2367 return 0;
2368 }
2369
2370 return PTR_ERR(ifp);
2371 }
2372
2373 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2374 unsigned int plen)
2375 {
2376 struct inet6_ifaddr *ifp;
2377 struct inet6_dev *idev;
2378 struct net_device *dev;
2379
2380 if (plen > 128)
2381 return -EINVAL;
2382
2383 dev = __dev_get_by_index(net, ifindex);
2384 if (!dev)
2385 return -ENODEV;
2386
2387 if ((idev = __in6_dev_get(dev)) == NULL)
2388 return -ENXIO;
2389
2390 read_lock_bh(&idev->lock);
2391 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2392 if (ifp->prefix_len == plen &&
2393 ipv6_addr_equal(pfx, &ifp->addr)) {
2394 in6_ifa_hold(ifp);
2395 read_unlock_bh(&idev->lock);
2396
2397 ipv6_del_addr(ifp);
2398
2399 /* If the last address is deleted administratively,
2400 disable IPv6 on this interface.
2401 */
2402 if (list_empty(&idev->addr_list))
2403 addrconf_ifdown(idev->dev, 1);
2404 return 0;
2405 }
2406 }
2407 read_unlock_bh(&idev->lock);
2408 return -EADDRNOTAVAIL;
2409 }
2410
2411
2412 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2413 {
2414 struct in6_ifreq ireq;
2415 int err;
2416
2417 if (!capable(CAP_NET_ADMIN))
2418 return -EPERM;
2419
2420 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2421 return -EFAULT;
2422
2423 rtnl_lock();
2424 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2425 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2426 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2427 rtnl_unlock();
2428 return err;
2429 }
2430
2431 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2432 {
2433 struct in6_ifreq ireq;
2434 int err;
2435
2436 if (!capable(CAP_NET_ADMIN))
2437 return -EPERM;
2438
2439 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2440 return -EFAULT;
2441
2442 rtnl_lock();
2443 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2444 ireq.ifr6_prefixlen);
2445 rtnl_unlock();
2446 return err;
2447 }
2448
2449 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2450 int plen, int scope)
2451 {
2452 struct inet6_ifaddr *ifp;
2453
2454 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2455 if (!IS_ERR(ifp)) {
2456 spin_lock_bh(&ifp->lock);
2457 ifp->flags &= ~IFA_F_TENTATIVE;
2458 spin_unlock_bh(&ifp->lock);
2459 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2460 in6_ifa_put(ifp);
2461 }
2462 }
2463
2464 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2465 static void sit_add_v4_addrs(struct inet6_dev *idev)
2466 {
2467 struct in6_addr addr;
2468 struct net_device *dev;
2469 struct net *net = dev_net(idev->dev);
2470 int scope;
2471
2472 ASSERT_RTNL();
2473
2474 memset(&addr, 0, sizeof(struct in6_addr));
2475 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2476
2477 if (idev->dev->flags&IFF_POINTOPOINT) {
2478 addr.s6_addr32[0] = htonl(0xfe800000);
2479 scope = IFA_LINK;
2480 } else {
2481 scope = IPV6_ADDR_COMPATv4;
2482 }
2483
2484 if (addr.s6_addr32[3]) {
2485 add_addr(idev, &addr, 128, scope);
2486 return;
2487 }
2488
2489 for_each_netdev(net, dev) {
2490 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2491 if (in_dev && (dev->flags & IFF_UP)) {
2492 struct in_ifaddr *ifa;
2493
2494 int flag = scope;
2495
2496 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2497 int plen;
2498
2499 addr.s6_addr32[3] = ifa->ifa_local;
2500
2501 if (ifa->ifa_scope == RT_SCOPE_LINK)
2502 continue;
2503 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2504 if (idev->dev->flags&IFF_POINTOPOINT)
2505 continue;
2506 flag |= IFA_HOST;
2507 }
2508 if (idev->dev->flags&IFF_POINTOPOINT)
2509 plen = 64;
2510 else
2511 plen = 96;
2512
2513 add_addr(idev, &addr, plen, flag);
2514 }
2515 }
2516 }
2517 }
2518 #endif
2519
2520 static void init_loopback(struct net_device *dev)
2521 {
2522 struct inet6_dev *idev;
2523
2524 /* ::1 */
2525
2526 ASSERT_RTNL();
2527
2528 if ((idev = ipv6_find_idev(dev)) == NULL) {
2529 pr_debug("%s: add_dev failed\n", __func__);
2530 return;
2531 }
2532
2533 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2534 }
2535
2536 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2537 {
2538 struct inet6_ifaddr *ifp;
2539 u32 addr_flags = IFA_F_PERMANENT;
2540
2541 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2542 if (idev->cnf.optimistic_dad &&
2543 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2544 addr_flags |= IFA_F_OPTIMISTIC;
2545 #endif
2546
2547
2548 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2549 if (!IS_ERR(ifp)) {
2550 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2551 addrconf_dad_start(ifp);
2552 in6_ifa_put(ifp);
2553 }
2554 }
2555
2556 static void addrconf_dev_config(struct net_device *dev)
2557 {
2558 struct in6_addr addr;
2559 struct inet6_dev *idev;
2560
2561 ASSERT_RTNL();
2562
2563 if ((dev->type != ARPHRD_ETHER) &&
2564 (dev->type != ARPHRD_FDDI) &&
2565 (dev->type != ARPHRD_ARCNET) &&
2566 (dev->type != ARPHRD_INFINIBAND) &&
2567 (dev->type != ARPHRD_IEEE802154)) {
2568 /* Alas, we support only Ethernet autoconfiguration. */
2569 return;
2570 }
2571
2572 idev = addrconf_add_dev(dev);
2573 if (IS_ERR(idev))
2574 return;
2575
2576 memset(&addr, 0, sizeof(struct in6_addr));
2577 addr.s6_addr32[0] = htonl(0xFE800000);
2578
2579 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2580 addrconf_add_linklocal(idev, &addr);
2581 }
2582
2583 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2584 static void addrconf_sit_config(struct net_device *dev)
2585 {
2586 struct inet6_dev *idev;
2587
2588 ASSERT_RTNL();
2589
2590 /*
2591 * Configure the tunnel with one of our IPv4
2592 * addresses... we should configure all of
2593 * our v4 addrs in the tunnel
2594 */
2595
2596 if ((idev = ipv6_find_idev(dev)) == NULL) {
2597 pr_debug("%s: add_dev failed\n", __func__);
2598 return;
2599 }
2600
2601 if (dev->priv_flags & IFF_ISATAP) {
2602 struct in6_addr addr;
2603
2604 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2605 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2606 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2607 addrconf_add_linklocal(idev, &addr);
2608 return;
2609 }
2610
2611 sit_add_v4_addrs(idev);
2612
2613 if (dev->flags&IFF_POINTOPOINT)
2614 addrconf_add_mroute(dev);
2615 else
2616 sit_route_add(dev);
2617 }
2618 #endif
2619
2620 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2621 static void addrconf_gre_config(struct net_device *dev)
2622 {
2623 struct inet6_dev *idev;
2624 struct in6_addr addr;
2625
2626 pr_info("%s(%s)\n", __func__, dev->name);
2627
2628 ASSERT_RTNL();
2629
2630 if ((idev = ipv6_find_idev(dev)) == NULL) {
2631 pr_debug("%s: add_dev failed\n", __func__);
2632 return;
2633 }
2634
2635 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2636 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2637
2638 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2639 addrconf_add_linklocal(idev, &addr);
2640 }
2641 #endif
2642
2643 static inline int
2644 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2645 {
2646 struct in6_addr lladdr;
2647
2648 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2649 addrconf_add_linklocal(idev, &lladdr);
2650 return 0;
2651 }
2652 return -1;
2653 }
2654
2655 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2656 {
2657 struct net_device *link_dev;
2658 struct net *net = dev_net(idev->dev);
2659
2660 /* first try to inherit the link-local address from the link device */
2661 if (idev->dev->iflink &&
2662 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2663 if (!ipv6_inherit_linklocal(idev, link_dev))
2664 return;
2665 }
2666 /* then try to inherit it from any device */
2667 for_each_netdev(net, link_dev) {
2668 if (!ipv6_inherit_linklocal(idev, link_dev))
2669 return;
2670 }
2671 pr_debug("init ip6-ip6: add_linklocal failed\n");
2672 }
2673
2674 /*
2675 * Autoconfigure tunnel with a link-local address so routing protocols,
2676 * DHCPv6, MLD etc. can be run over the virtual link
2677 */
2678
2679 static void addrconf_ip6_tnl_config(struct net_device *dev)
2680 {
2681 struct inet6_dev *idev;
2682
2683 ASSERT_RTNL();
2684
2685 idev = addrconf_add_dev(dev);
2686 if (IS_ERR(idev)) {
2687 pr_debug("init ip6-ip6: add_dev failed\n");
2688 return;
2689 }
2690 ip6_tnl_add_linklocal(idev);
2691 }
2692
2693 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2694 void *data)
2695 {
2696 struct net_device *dev = (struct net_device *) data;
2697 struct inet6_dev *idev = __in6_dev_get(dev);
2698 int run_pending = 0;
2699 int err;
2700
2701 switch (event) {
2702 case NETDEV_REGISTER:
2703 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2704 idev = ipv6_add_dev(dev);
2705 if (!idev)
2706 return notifier_from_errno(-ENOMEM);
2707 }
2708 break;
2709
2710 case NETDEV_UP:
2711 case NETDEV_CHANGE:
2712 if (dev->flags & IFF_SLAVE)
2713 break;
2714
2715 if (event == NETDEV_UP) {
2716 if (!addrconf_qdisc_ok(dev)) {
2717 /* device is not ready yet. */
2718 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2719 dev->name);
2720 break;
2721 }
2722
2723 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2724 idev = ipv6_add_dev(dev);
2725
2726 if (idev) {
2727 idev->if_flags |= IF_READY;
2728 run_pending = 1;
2729 }
2730 } else {
2731 if (!addrconf_qdisc_ok(dev)) {
2732 /* device is still not ready. */
2733 break;
2734 }
2735
2736 if (idev) {
2737 if (idev->if_flags & IF_READY)
2738 /* device is already configured. */
2739 break;
2740 idev->if_flags |= IF_READY;
2741 }
2742
2743 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2744 dev->name);
2745
2746 run_pending = 1;
2747 }
2748
2749 switch (dev->type) {
2750 #if defined(CONFIG_IPV6_SIT) || defined(CONFIG_IPV6_SIT_MODULE)
2751 case ARPHRD_SIT:
2752 addrconf_sit_config(dev);
2753 break;
2754 #endif
2755 #if defined(CONFIG_NET_IPGRE) || defined(CONFIG_NET_IPGRE_MODULE)
2756 case ARPHRD_IPGRE:
2757 addrconf_gre_config(dev);
2758 break;
2759 #endif
2760 case ARPHRD_TUNNEL6:
2761 addrconf_ip6_tnl_config(dev);
2762 break;
2763 case ARPHRD_LOOPBACK:
2764 init_loopback(dev);
2765 break;
2766
2767 default:
2768 addrconf_dev_config(dev);
2769 break;
2770 }
2771
2772 if (idev) {
2773 if (run_pending)
2774 addrconf_dad_run(idev);
2775
2776 /*
2777 * If the MTU changed during the interface down,
2778 * when the interface up, the changed MTU must be
2779 * reflected in the idev as well as routers.
2780 */
2781 if (idev->cnf.mtu6 != dev->mtu &&
2782 dev->mtu >= IPV6_MIN_MTU) {
2783 rt6_mtu_change(dev, dev->mtu);
2784 idev->cnf.mtu6 = dev->mtu;
2785 }
2786 idev->tstamp = jiffies;
2787 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2788
2789 /*
2790 * If the changed mtu during down is lower than
2791 * IPV6_MIN_MTU stop IPv6 on this interface.
2792 */
2793 if (dev->mtu < IPV6_MIN_MTU)
2794 addrconf_ifdown(dev, 1);
2795 }
2796 break;
2797
2798 case NETDEV_CHANGEMTU:
2799 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2800 rt6_mtu_change(dev, dev->mtu);
2801 idev->cnf.mtu6 = dev->mtu;
2802 break;
2803 }
2804
2805 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2806 idev = ipv6_add_dev(dev);
2807 if (idev)
2808 break;
2809 }
2810
2811 /*
2812 * MTU falled under IPV6_MIN_MTU.
2813 * Stop IPv6 on this interface.
2814 */
2815
2816 case NETDEV_DOWN:
2817 case NETDEV_UNREGISTER:
2818 /*
2819 * Remove all addresses from this interface.
2820 */
2821 addrconf_ifdown(dev, event != NETDEV_DOWN);
2822 break;
2823
2824 case NETDEV_CHANGENAME:
2825 if (idev) {
2826 snmp6_unregister_dev(idev);
2827 addrconf_sysctl_unregister(idev);
2828 addrconf_sysctl_register(idev);
2829 err = snmp6_register_dev(idev);
2830 if (err)
2831 return notifier_from_errno(err);
2832 }
2833 break;
2834
2835 case NETDEV_PRE_TYPE_CHANGE:
2836 case NETDEV_POST_TYPE_CHANGE:
2837 addrconf_type_change(dev, event);
2838 break;
2839 }
2840
2841 return NOTIFY_OK;
2842 }
2843
2844 /*
2845 * addrconf module should be notified of a device going up
2846 */
2847 static struct notifier_block ipv6_dev_notf = {
2848 .notifier_call = addrconf_notify,
2849 };
2850
2851 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2852 {
2853 struct inet6_dev *idev;
2854 ASSERT_RTNL();
2855
2856 idev = __in6_dev_get(dev);
2857
2858 if (event == NETDEV_POST_TYPE_CHANGE)
2859 ipv6_mc_remap(idev);
2860 else if (event == NETDEV_PRE_TYPE_CHANGE)
2861 ipv6_mc_unmap(idev);
2862 }
2863
2864 static int addrconf_ifdown(struct net_device *dev, int how)
2865 {
2866 struct net *net = dev_net(dev);
2867 struct inet6_dev *idev;
2868 struct inet6_ifaddr *ifa;
2869 int state, i;
2870
2871 ASSERT_RTNL();
2872
2873 rt6_ifdown(net, dev);
2874 neigh_ifdown(&nd_tbl, dev);
2875
2876 idev = __in6_dev_get(dev);
2877 if (idev == NULL)
2878 return -ENODEV;
2879
2880 /*
2881 * Step 1: remove reference to ipv6 device from parent device.
2882 * Do not dev_put!
2883 */
2884 if (how) {
2885 idev->dead = 1;
2886
2887 /* protected by rtnl_lock */
2888 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2889
2890 /* Step 1.5: remove snmp6 entry */
2891 snmp6_unregister_dev(idev);
2892
2893 }
2894
2895 /* Step 2: clear hash table */
2896 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2897 struct hlist_head *h = &inet6_addr_lst[i];
2898 struct hlist_node *n;
2899
2900 spin_lock_bh(&addrconf_hash_lock);
2901 restart:
2902 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2903 if (ifa->idev == idev) {
2904 hlist_del_init_rcu(&ifa->addr_lst);
2905 addrconf_del_timer(ifa);
2906 goto restart;
2907 }
2908 }
2909 spin_unlock_bh(&addrconf_hash_lock);
2910 }
2911
2912 write_lock_bh(&idev->lock);
2913
2914 /* Step 2: clear flags for stateless addrconf */
2915 if (!how)
2916 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2917
2918 #ifdef CONFIG_IPV6_PRIVACY
2919 if (how && del_timer(&idev->regen_timer))
2920 in6_dev_put(idev);
2921
2922 /* Step 3: clear tempaddr list */
2923 while (!list_empty(&idev->tempaddr_list)) {
2924 ifa = list_first_entry(&idev->tempaddr_list,
2925 struct inet6_ifaddr, tmp_list);
2926 list_del(&ifa->tmp_list);
2927 write_unlock_bh(&idev->lock);
2928 spin_lock_bh(&ifa->lock);
2929
2930 if (ifa->ifpub) {
2931 in6_ifa_put(ifa->ifpub);
2932 ifa->ifpub = NULL;
2933 }
2934 spin_unlock_bh(&ifa->lock);
2935 in6_ifa_put(ifa);
2936 write_lock_bh(&idev->lock);
2937 }
2938 #endif
2939
2940 while (!list_empty(&idev->addr_list)) {
2941 ifa = list_first_entry(&idev->addr_list,
2942 struct inet6_ifaddr, if_list);
2943 addrconf_del_timer(ifa);
2944
2945 list_del(&ifa->if_list);
2946
2947 write_unlock_bh(&idev->lock);
2948
2949 spin_lock_bh(&ifa->state_lock);
2950 state = ifa->state;
2951 ifa->state = INET6_IFADDR_STATE_DEAD;
2952 spin_unlock_bh(&ifa->state_lock);
2953
2954 if (state != INET6_IFADDR_STATE_DEAD) {
2955 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2956 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2957 }
2958 in6_ifa_put(ifa);
2959
2960 write_lock_bh(&idev->lock);
2961 }
2962
2963 write_unlock_bh(&idev->lock);
2964
2965 /* Step 5: Discard multicast list */
2966 if (how)
2967 ipv6_mc_destroy_dev(idev);
2968 else
2969 ipv6_mc_down(idev);
2970
2971 idev->tstamp = jiffies;
2972
2973 /* Last: Shot the device (if unregistered) */
2974 if (how) {
2975 addrconf_sysctl_unregister(idev);
2976 neigh_parms_release(&nd_tbl, idev->nd_parms);
2977 neigh_ifdown(&nd_tbl, dev);
2978 in6_dev_put(idev);
2979 }
2980 return 0;
2981 }
2982
2983 static void addrconf_rs_timer(unsigned long data)
2984 {
2985 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2986 struct inet6_dev *idev = ifp->idev;
2987
2988 read_lock(&idev->lock);
2989 if (idev->dead || !(idev->if_flags & IF_READY))
2990 goto out;
2991
2992 if (idev->cnf.forwarding)
2993 goto out;
2994
2995 /* Announcement received after solicitation was sent */
2996 if (idev->if_flags & IF_RA_RCVD)
2997 goto out;
2998
2999 spin_lock(&ifp->lock);
3000 if (ifp->probes++ < idev->cnf.rtr_solicits) {
3001 /* The wait after the last probe can be shorter */
3002 addrconf_mod_timer(ifp, AC_RS,
3003 (ifp->probes == idev->cnf.rtr_solicits) ?
3004 idev->cnf.rtr_solicit_delay :
3005 idev->cnf.rtr_solicit_interval);
3006 spin_unlock(&ifp->lock);
3007
3008 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3009 } else {
3010 spin_unlock(&ifp->lock);
3011 /*
3012 * Note: we do not support deprecated "all on-link"
3013 * assumption any longer.
3014 */
3015 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3016 }
3017
3018 out:
3019 read_unlock(&idev->lock);
3020 in6_ifa_put(ifp);
3021 }
3022
3023 /*
3024 * Duplicate Address Detection
3025 */
3026 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3027 {
3028 unsigned long rand_num;
3029 struct inet6_dev *idev = ifp->idev;
3030
3031 if (ifp->flags & IFA_F_OPTIMISTIC)
3032 rand_num = 0;
3033 else
3034 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3035
3036 ifp->probes = idev->cnf.dad_transmits;
3037 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3038 }
3039
3040 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3041 {
3042 struct inet6_dev *idev = ifp->idev;
3043 struct net_device *dev = idev->dev;
3044
3045 addrconf_join_solict(dev, &ifp->addr);
3046
3047 net_srandom(ifp->addr.s6_addr32[3]);
3048
3049 read_lock_bh(&idev->lock);
3050 spin_lock(&ifp->lock);
3051 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3052 goto out;
3053
3054 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3055 idev->cnf.accept_dad < 1 ||
3056 !(ifp->flags&IFA_F_TENTATIVE) ||
3057 ifp->flags & IFA_F_NODAD) {
3058 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3059 spin_unlock(&ifp->lock);
3060 read_unlock_bh(&idev->lock);
3061
3062 addrconf_dad_completed(ifp);
3063 return;
3064 }
3065
3066 if (!(idev->if_flags & IF_READY)) {
3067 spin_unlock(&ifp->lock);
3068 read_unlock_bh(&idev->lock);
3069 /*
3070 * If the device is not ready:
3071 * - keep it tentative if it is a permanent address.
3072 * - otherwise, kill it.
3073 */
3074 in6_ifa_hold(ifp);
3075 addrconf_dad_stop(ifp, 0);
3076 return;
3077 }
3078
3079 /*
3080 * Optimistic nodes can start receiving
3081 * Frames right away
3082 */
3083 if (ifp->flags & IFA_F_OPTIMISTIC)
3084 ip6_ins_rt(ifp->rt);
3085
3086 addrconf_dad_kick(ifp);
3087 out:
3088 spin_unlock(&ifp->lock);
3089 read_unlock_bh(&idev->lock);
3090 }
3091
3092 static void addrconf_dad_timer(unsigned long data)
3093 {
3094 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3095 struct inet6_dev *idev = ifp->idev;
3096 struct in6_addr mcaddr;
3097
3098 if (!ifp->probes && addrconf_dad_end(ifp))
3099 goto out;
3100
3101 read_lock(&idev->lock);
3102 if (idev->dead || !(idev->if_flags & IF_READY)) {
3103 read_unlock(&idev->lock);
3104 goto out;
3105 }
3106
3107 spin_lock(&ifp->lock);
3108 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3109 spin_unlock(&ifp->lock);
3110 read_unlock(&idev->lock);
3111 goto out;
3112 }
3113
3114 if (ifp->probes == 0) {
3115 /*
3116 * DAD was successful
3117 */
3118
3119 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3120 spin_unlock(&ifp->lock);
3121 read_unlock(&idev->lock);
3122
3123 addrconf_dad_completed(ifp);
3124
3125 goto out;
3126 }
3127
3128 ifp->probes--;
3129 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3130 spin_unlock(&ifp->lock);
3131 read_unlock(&idev->lock);
3132
3133 /* send a neighbour solicitation for our addr */
3134 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3135 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3136 out:
3137 in6_ifa_put(ifp);
3138 }
3139
3140 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3141 {
3142 struct net_device *dev = ifp->idev->dev;
3143
3144 /*
3145 * Configure the address for reception. Now it is valid.
3146 */
3147
3148 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3149
3150 /* If added prefix is link local and we are prepared to process
3151 router advertisements, start sending router solicitations.
3152 */
3153
3154 if (((ifp->idev->cnf.accept_ra == 1 && !ifp->idev->cnf.forwarding) ||
3155 ifp->idev->cnf.accept_ra == 2) &&
3156 ifp->idev->cnf.rtr_solicits > 0 &&
3157 (dev->flags&IFF_LOOPBACK) == 0 &&
3158 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3159 /*
3160 * If a host as already performed a random delay
3161 * [...] as part of DAD [...] there is no need
3162 * to delay again before sending the first RS
3163 */
3164 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3165
3166 spin_lock_bh(&ifp->lock);
3167 ifp->probes = 1;
3168 ifp->idev->if_flags |= IF_RS_SENT;
3169 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3170 spin_unlock_bh(&ifp->lock);
3171 }
3172 }
3173
3174 static void addrconf_dad_run(struct inet6_dev *idev)
3175 {
3176 struct inet6_ifaddr *ifp;
3177
3178 read_lock_bh(&idev->lock);
3179 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3180 spin_lock(&ifp->lock);
3181 if (ifp->flags & IFA_F_TENTATIVE &&
3182 ifp->state == INET6_IFADDR_STATE_DAD)
3183 addrconf_dad_kick(ifp);
3184 spin_unlock(&ifp->lock);
3185 }
3186 read_unlock_bh(&idev->lock);
3187 }
3188
3189 #ifdef CONFIG_PROC_FS
3190 struct if6_iter_state {
3191 struct seq_net_private p;
3192 int bucket;
3193 int offset;
3194 };
3195
3196 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3197 {
3198 struct inet6_ifaddr *ifa = NULL;
3199 struct if6_iter_state *state = seq->private;
3200 struct net *net = seq_file_net(seq);
3201 int p = 0;
3202
3203 /* initial bucket if pos is 0 */
3204 if (pos == 0) {
3205 state->bucket = 0;
3206 state->offset = 0;
3207 }
3208
3209 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3210 struct hlist_node *n;
3211 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3212 addr_lst) {
3213 if (!net_eq(dev_net(ifa->idev->dev), net))
3214 continue;
3215 /* sync with offset */
3216 if (p < state->offset) {
3217 p++;
3218 continue;
3219 }
3220 state->offset++;
3221 return ifa;
3222 }
3223
3224 /* prepare for next bucket */
3225 state->offset = 0;
3226 p = 0;
3227 }
3228 return NULL;
3229 }
3230
3231 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3232 struct inet6_ifaddr *ifa)
3233 {
3234 struct if6_iter_state *state = seq->private;
3235 struct net *net = seq_file_net(seq);
3236 struct hlist_node *n = &ifa->addr_lst;
3237
3238 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3239 if (!net_eq(dev_net(ifa->idev->dev), net))
3240 continue;
3241 state->offset++;
3242 return ifa;
3243 }
3244
3245 while (++state->bucket < IN6_ADDR_HSIZE) {
3246 state->offset = 0;
3247 hlist_for_each_entry_rcu_bh(ifa, n,
3248 &inet6_addr_lst[state->bucket], addr_lst) {
3249 if (!net_eq(dev_net(ifa->idev->dev), net))
3250 continue;
3251 state->offset++;
3252 return ifa;
3253 }
3254 }
3255
3256 return NULL;
3257 }
3258
3259 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3260 __acquires(rcu_bh)
3261 {
3262 rcu_read_lock_bh();
3263 return if6_get_first(seq, *pos);
3264 }
3265
3266 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3267 {
3268 struct inet6_ifaddr *ifa;
3269
3270 ifa = if6_get_next(seq, v);
3271 ++*pos;
3272 return ifa;
3273 }
3274
3275 static void if6_seq_stop(struct seq_file *seq, void *v)
3276 __releases(rcu_bh)
3277 {
3278 rcu_read_unlock_bh();
3279 }
3280
3281 static int if6_seq_show(struct seq_file *seq, void *v)
3282 {
3283 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3284 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3285 &ifp->addr,
3286 ifp->idev->dev->ifindex,
3287 ifp->prefix_len,
3288 ifp->scope,
3289 ifp->flags,
3290 ifp->idev->dev->name);
3291 return 0;
3292 }
3293
3294 static const struct seq_operations if6_seq_ops = {
3295 .start = if6_seq_start,
3296 .next = if6_seq_next,
3297 .show = if6_seq_show,
3298 .stop = if6_seq_stop,
3299 };
3300
3301 static int if6_seq_open(struct inode *inode, struct file *file)
3302 {
3303 return seq_open_net(inode, file, &if6_seq_ops,
3304 sizeof(struct if6_iter_state));
3305 }
3306
3307 static const struct file_operations if6_fops = {
3308 .owner = THIS_MODULE,
3309 .open = if6_seq_open,
3310 .read = seq_read,
3311 .llseek = seq_lseek,
3312 .release = seq_release_net,
3313 };
3314
3315 static int __net_init if6_proc_net_init(struct net *net)
3316 {
3317 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3318 return -ENOMEM;
3319 return 0;
3320 }
3321
3322 static void __net_exit if6_proc_net_exit(struct net *net)
3323 {
3324 proc_net_remove(net, "if_inet6");
3325 }
3326
3327 static struct pernet_operations if6_proc_net_ops = {
3328 .init = if6_proc_net_init,
3329 .exit = if6_proc_net_exit,
3330 };
3331
3332 int __init if6_proc_init(void)
3333 {
3334 return register_pernet_subsys(&if6_proc_net_ops);
3335 }
3336
3337 void if6_proc_exit(void)
3338 {
3339 unregister_pernet_subsys(&if6_proc_net_ops);
3340 }
3341 #endif /* CONFIG_PROC_FS */
3342
3343 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
3344 /* Check if address is a home address configured on any interface. */
3345 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3346 {
3347 int ret = 0;
3348 struct inet6_ifaddr *ifp = NULL;
3349 struct hlist_node *n;
3350 unsigned int hash = inet6_addr_hash(addr);
3351
3352 rcu_read_lock_bh();
3353 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3354 if (!net_eq(dev_net(ifp->idev->dev), net))
3355 continue;
3356 if (ipv6_addr_equal(&ifp->addr, addr) &&
3357 (ifp->flags & IFA_F_HOMEADDRESS)) {
3358 ret = 1;
3359 break;
3360 }
3361 }
3362 rcu_read_unlock_bh();
3363 return ret;
3364 }
3365 #endif
3366
3367 /*
3368 * Periodic address status verification
3369 */
3370
3371 static void addrconf_verify(unsigned long foo)
3372 {
3373 unsigned long now, next, next_sec, next_sched;
3374 struct inet6_ifaddr *ifp;
3375 struct hlist_node *node;
3376 int i;
3377
3378 rcu_read_lock_bh();
3379 spin_lock(&addrconf_verify_lock);
3380 now = jiffies;
3381 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3382
3383 del_timer(&addr_chk_timer);
3384
3385 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3386 restart:
3387 hlist_for_each_entry_rcu_bh(ifp, node,
3388 &inet6_addr_lst[i], addr_lst) {
3389 unsigned long age;
3390
3391 if (ifp->flags & IFA_F_PERMANENT)
3392 continue;
3393
3394 spin_lock(&ifp->lock);
3395 /* We try to batch several events at once. */
3396 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3397
3398 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3399 age >= ifp->valid_lft) {
3400 spin_unlock(&ifp->lock);
3401 in6_ifa_hold(ifp);
3402 ipv6_del_addr(ifp);
3403 goto restart;
3404 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3405 spin_unlock(&ifp->lock);
3406 continue;
3407 } else if (age >= ifp->prefered_lft) {
3408 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3409 int deprecate = 0;
3410
3411 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3412 deprecate = 1;
3413 ifp->flags |= IFA_F_DEPRECATED;
3414 }
3415
3416 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3417 next = ifp->tstamp + ifp->valid_lft * HZ;
3418
3419 spin_unlock(&ifp->lock);
3420
3421 if (deprecate) {
3422 in6_ifa_hold(ifp);
3423
3424 ipv6_ifa_notify(0, ifp);
3425 in6_ifa_put(ifp);
3426 goto restart;
3427 }
3428 #ifdef CONFIG_IPV6_PRIVACY
3429 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3430 !(ifp->flags&IFA_F_TENTATIVE)) {
3431 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3432 ifp->idev->cnf.dad_transmits *
3433 ifp->idev->nd_parms->retrans_time / HZ;
3434
3435 if (age >= ifp->prefered_lft - regen_advance) {
3436 struct inet6_ifaddr *ifpub = ifp->ifpub;
3437 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3438 next = ifp->tstamp + ifp->prefered_lft * HZ;
3439 if (!ifp->regen_count && ifpub) {
3440 ifp->regen_count++;
3441 in6_ifa_hold(ifp);
3442 in6_ifa_hold(ifpub);
3443 spin_unlock(&ifp->lock);
3444
3445 spin_lock(&ifpub->lock);
3446 ifpub->regen_count = 0;
3447 spin_unlock(&ifpub->lock);
3448 ipv6_create_tempaddr(ifpub, ifp);
3449 in6_ifa_put(ifpub);
3450 in6_ifa_put(ifp);
3451 goto restart;
3452 }
3453 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3454 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3455 spin_unlock(&ifp->lock);
3456 #endif
3457 } else {
3458 /* ifp->prefered_lft <= ifp->valid_lft */
3459 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3460 next = ifp->tstamp + ifp->prefered_lft * HZ;
3461 spin_unlock(&ifp->lock);
3462 }
3463 }
3464 }
3465
3466 next_sec = round_jiffies_up(next);
3467 next_sched = next;
3468
3469 /* If rounded timeout is accurate enough, accept it. */
3470 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3471 next_sched = next_sec;
3472
3473 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3474 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3475 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3476
3477 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3478 now, next, next_sec, next_sched));
3479
3480 addr_chk_timer.expires = next_sched;
3481 add_timer(&addr_chk_timer);
3482 spin_unlock(&addrconf_verify_lock);
3483 rcu_read_unlock_bh();
3484 }
3485
3486 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3487 {
3488 struct in6_addr *pfx = NULL;
3489
3490 if (addr)
3491 pfx = nla_data(addr);
3492
3493 if (local) {
3494 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3495 pfx = NULL;
3496 else
3497 pfx = nla_data(local);
3498 }
3499
3500 return pfx;
3501 }
3502
3503 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3504 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3505 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3506 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3507 };
3508
3509 static int
3510 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3511 {
3512 struct net *net = sock_net(skb->sk);
3513 struct ifaddrmsg *ifm;
3514 struct nlattr *tb[IFA_MAX+1];
3515 struct in6_addr *pfx;
3516 int err;
3517
3518 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3519 if (err < 0)
3520 return err;
3521
3522 ifm = nlmsg_data(nlh);
3523 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3524 if (pfx == NULL)
3525 return -EINVAL;
3526
3527 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3528 }
3529
3530 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3531 u32 prefered_lft, u32 valid_lft)
3532 {
3533 u32 flags;
3534 clock_t expires;
3535 unsigned long timeout;
3536
3537 if (!valid_lft || (prefered_lft > valid_lft))
3538 return -EINVAL;
3539
3540 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3541 if (addrconf_finite_timeout(timeout)) {
3542 expires = jiffies_to_clock_t(timeout * HZ);
3543 valid_lft = timeout;
3544 flags = RTF_EXPIRES;
3545 } else {
3546 expires = 0;
3547 flags = 0;
3548 ifa_flags |= IFA_F_PERMANENT;
3549 }
3550
3551 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3552 if (addrconf_finite_timeout(timeout)) {
3553 if (timeout == 0)
3554 ifa_flags |= IFA_F_DEPRECATED;
3555 prefered_lft = timeout;
3556 }
3557
3558 spin_lock_bh(&ifp->lock);
3559 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3560 ifp->tstamp = jiffies;
3561 ifp->valid_lft = valid_lft;
3562 ifp->prefered_lft = prefered_lft;
3563
3564 spin_unlock_bh(&ifp->lock);
3565 if (!(ifp->flags&IFA_F_TENTATIVE))
3566 ipv6_ifa_notify(0, ifp);
3567
3568 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3569 expires, flags);
3570 addrconf_verify(0);
3571
3572 return 0;
3573 }
3574
3575 static int
3576 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3577 {
3578 struct net *net = sock_net(skb->sk);
3579 struct ifaddrmsg *ifm;
3580 struct nlattr *tb[IFA_MAX+1];
3581 struct in6_addr *pfx;
3582 struct inet6_ifaddr *ifa;
3583 struct net_device *dev;
3584 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3585 u8 ifa_flags;
3586 int err;
3587
3588 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3589 if (err < 0)
3590 return err;
3591
3592 ifm = nlmsg_data(nlh);
3593 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3594 if (pfx == NULL)
3595 return -EINVAL;
3596
3597 if (tb[IFA_CACHEINFO]) {
3598 struct ifa_cacheinfo *ci;
3599
3600 ci = nla_data(tb[IFA_CACHEINFO]);
3601 valid_lft = ci->ifa_valid;
3602 preferred_lft = ci->ifa_prefered;
3603 } else {
3604 preferred_lft = INFINITY_LIFE_TIME;
3605 valid_lft = INFINITY_LIFE_TIME;
3606 }
3607
3608 dev = __dev_get_by_index(net, ifm->ifa_index);
3609 if (dev == NULL)
3610 return -ENODEV;
3611
3612 /* We ignore other flags so far. */
3613 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3614
3615 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3616 if (ifa == NULL) {
3617 /*
3618 * It would be best to check for !NLM_F_CREATE here but
3619 * userspace alreay relies on not having to provide this.
3620 */
3621 return inet6_addr_add(net, ifm->ifa_index, pfx,
3622 ifm->ifa_prefixlen, ifa_flags,
3623 preferred_lft, valid_lft);
3624 }
3625
3626 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3627 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3628 err = -EEXIST;
3629 else
3630 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3631
3632 in6_ifa_put(ifa);
3633
3634 return err;
3635 }
3636
3637 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3638 u8 scope, int ifindex)
3639 {
3640 struct ifaddrmsg *ifm;
3641
3642 ifm = nlmsg_data(nlh);
3643 ifm->ifa_family = AF_INET6;
3644 ifm->ifa_prefixlen = prefixlen;
3645 ifm->ifa_flags = flags;
3646 ifm->ifa_scope = scope;
3647 ifm->ifa_index = ifindex;
3648 }
3649
3650 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3651 unsigned long tstamp, u32 preferred, u32 valid)
3652 {
3653 struct ifa_cacheinfo ci;
3654
3655 ci.cstamp = cstamp_delta(cstamp);
3656 ci.tstamp = cstamp_delta(tstamp);
3657 ci.ifa_prefered = preferred;
3658 ci.ifa_valid = valid;
3659
3660 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3661 }
3662
3663 static inline int rt_scope(int ifa_scope)
3664 {
3665 if (ifa_scope & IFA_HOST)
3666 return RT_SCOPE_HOST;
3667 else if (ifa_scope & IFA_LINK)
3668 return RT_SCOPE_LINK;
3669 else if (ifa_scope & IFA_SITE)
3670 return RT_SCOPE_SITE;
3671 else
3672 return RT_SCOPE_UNIVERSE;
3673 }
3674
3675 static inline int inet6_ifaddr_msgsize(void)
3676 {
3677 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3678 + nla_total_size(16) /* IFA_ADDRESS */
3679 + nla_total_size(sizeof(struct ifa_cacheinfo));
3680 }
3681
3682 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3683 u32 portid, u32 seq, int event, unsigned int flags)
3684 {
3685 struct nlmsghdr *nlh;
3686 u32 preferred, valid;
3687
3688 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3689 if (nlh == NULL)
3690 return -EMSGSIZE;
3691
3692 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3693 ifa->idev->dev->ifindex);
3694
3695 if (!(ifa->flags&IFA_F_PERMANENT)) {
3696 preferred = ifa->prefered_lft;
3697 valid = ifa->valid_lft;
3698 if (preferred != INFINITY_LIFE_TIME) {
3699 long tval = (jiffies - ifa->tstamp)/HZ;
3700 if (preferred > tval)
3701 preferred -= tval;
3702 else
3703 preferred = 0;
3704 if (valid != INFINITY_LIFE_TIME) {
3705 if (valid > tval)
3706 valid -= tval;
3707 else
3708 valid = 0;
3709 }
3710 }
3711 } else {
3712 preferred = INFINITY_LIFE_TIME;
3713 valid = INFINITY_LIFE_TIME;
3714 }
3715
3716 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3717 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3718 nlmsg_cancel(skb, nlh);
3719 return -EMSGSIZE;
3720 }
3721
3722 return nlmsg_end(skb, nlh);
3723 }
3724
3725 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3726 u32 portid, u32 seq, int event, u16 flags)
3727 {
3728 struct nlmsghdr *nlh;
3729 u8 scope = RT_SCOPE_UNIVERSE;
3730 int ifindex = ifmca->idev->dev->ifindex;
3731
3732 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3733 scope = RT_SCOPE_SITE;
3734
3735 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3736 if (nlh == NULL)
3737 return -EMSGSIZE;
3738
3739 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3740 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3741 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3742 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3743 nlmsg_cancel(skb, nlh);
3744 return -EMSGSIZE;
3745 }
3746
3747 return nlmsg_end(skb, nlh);
3748 }
3749
3750 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3751 u32 portid, u32 seq, int event, unsigned int flags)
3752 {
3753 struct nlmsghdr *nlh;
3754 u8 scope = RT_SCOPE_UNIVERSE;
3755 int ifindex = ifaca->aca_idev->dev->ifindex;
3756
3757 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3758 scope = RT_SCOPE_SITE;
3759
3760 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3761 if (nlh == NULL)
3762 return -EMSGSIZE;
3763
3764 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3765 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3766 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3767 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3768 nlmsg_cancel(skb, nlh);
3769 return -EMSGSIZE;
3770 }
3771
3772 return nlmsg_end(skb, nlh);
3773 }
3774
3775 enum addr_type_t {
3776 UNICAST_ADDR,
3777 MULTICAST_ADDR,
3778 ANYCAST_ADDR,
3779 };
3780
3781 /* called with rcu_read_lock() */
3782 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3783 struct netlink_callback *cb, enum addr_type_t type,
3784 int s_ip_idx, int *p_ip_idx)
3785 {
3786 struct ifmcaddr6 *ifmca;
3787 struct ifacaddr6 *ifaca;
3788 int err = 1;
3789 int ip_idx = *p_ip_idx;
3790
3791 read_lock_bh(&idev->lock);
3792 switch (type) {
3793 case UNICAST_ADDR: {
3794 struct inet6_ifaddr *ifa;
3795
3796 /* unicast address incl. temp addr */
3797 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3798 if (++ip_idx < s_ip_idx)
3799 continue;
3800 err = inet6_fill_ifaddr(skb, ifa,
3801 NETLINK_CB(cb->skb).portid,
3802 cb->nlh->nlmsg_seq,
3803 RTM_NEWADDR,
3804 NLM_F_MULTI);
3805 if (err <= 0)
3806 break;
3807 }
3808 break;
3809 }
3810 case MULTICAST_ADDR:
3811 /* multicast address */
3812 for (ifmca = idev->mc_list; ifmca;
3813 ifmca = ifmca->next, ip_idx++) {
3814 if (ip_idx < s_ip_idx)
3815 continue;
3816 err = inet6_fill_ifmcaddr(skb, ifmca,
3817 NETLINK_CB(cb->skb).portid,
3818 cb->nlh->nlmsg_seq,
3819 RTM_GETMULTICAST,
3820 NLM_F_MULTI);
3821 if (err <= 0)
3822 break;
3823 }
3824 break;
3825 case ANYCAST_ADDR:
3826 /* anycast address */
3827 for (ifaca = idev->ac_list; ifaca;
3828 ifaca = ifaca->aca_next, ip_idx++) {
3829 if (ip_idx < s_ip_idx)
3830 continue;
3831 err = inet6_fill_ifacaddr(skb, ifaca,
3832 NETLINK_CB(cb->skb).portid,
3833 cb->nlh->nlmsg_seq,
3834 RTM_GETANYCAST,
3835 NLM_F_MULTI);
3836 if (err <= 0)
3837 break;
3838 }
3839 break;
3840 default:
3841 break;
3842 }
3843 read_unlock_bh(&idev->lock);
3844 *p_ip_idx = ip_idx;
3845 return err;
3846 }
3847
3848 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3849 enum addr_type_t type)
3850 {
3851 struct net *net = sock_net(skb->sk);
3852 int h, s_h;
3853 int idx, ip_idx;
3854 int s_idx, s_ip_idx;
3855 struct net_device *dev;
3856 struct inet6_dev *idev;
3857 struct hlist_head *head;
3858 struct hlist_node *node;
3859
3860 s_h = cb->args[0];
3861 s_idx = idx = cb->args[1];
3862 s_ip_idx = ip_idx = cb->args[2];
3863
3864 rcu_read_lock();
3865 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3866 idx = 0;
3867 head = &net->dev_index_head[h];
3868 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3869 if (idx < s_idx)
3870 goto cont;
3871 if (h > s_h || idx > s_idx)
3872 s_ip_idx = 0;
3873 ip_idx = 0;
3874 idev = __in6_dev_get(dev);
3875 if (!idev)
3876 goto cont;
3877
3878 if (in6_dump_addrs(idev, skb, cb, type,
3879 s_ip_idx, &ip_idx) <= 0)
3880 goto done;
3881 cont:
3882 idx++;
3883 }
3884 }
3885 done:
3886 rcu_read_unlock();
3887 cb->args[0] = h;
3888 cb->args[1] = idx;
3889 cb->args[2] = ip_idx;
3890
3891 return skb->len;
3892 }
3893
3894 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3895 {
3896 enum addr_type_t type = UNICAST_ADDR;
3897
3898 return inet6_dump_addr(skb, cb, type);
3899 }
3900
3901 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3902 {
3903 enum addr_type_t type = MULTICAST_ADDR;
3904
3905 return inet6_dump_addr(skb, cb, type);
3906 }
3907
3908
3909 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3910 {
3911 enum addr_type_t type = ANYCAST_ADDR;
3912
3913 return inet6_dump_addr(skb, cb, type);
3914 }
3915
3916 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3917 void *arg)
3918 {
3919 struct net *net = sock_net(in_skb->sk);
3920 struct ifaddrmsg *ifm;
3921 struct nlattr *tb[IFA_MAX+1];
3922 struct in6_addr *addr = NULL;
3923 struct net_device *dev = NULL;
3924 struct inet6_ifaddr *ifa;
3925 struct sk_buff *skb;
3926 int err;
3927
3928 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3929 if (err < 0)
3930 goto errout;
3931
3932 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3933 if (addr == NULL) {
3934 err = -EINVAL;
3935 goto errout;
3936 }
3937
3938 ifm = nlmsg_data(nlh);
3939 if (ifm->ifa_index)
3940 dev = __dev_get_by_index(net, ifm->ifa_index);
3941
3942 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3943 if (!ifa) {
3944 err = -EADDRNOTAVAIL;
3945 goto errout;
3946 }
3947
3948 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3949 if (!skb) {
3950 err = -ENOBUFS;
3951 goto errout_ifa;
3952 }
3953
3954 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
3955 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3956 if (err < 0) {
3957 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3958 WARN_ON(err == -EMSGSIZE);
3959 kfree_skb(skb);
3960 goto errout_ifa;
3961 }
3962 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3963 errout_ifa:
3964 in6_ifa_put(ifa);
3965 errout:
3966 return err;
3967 }
3968
3969 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3970 {
3971 struct sk_buff *skb;
3972 struct net *net = dev_net(ifa->idev->dev);
3973 int err = -ENOBUFS;
3974
3975 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3976 if (skb == NULL)
3977 goto errout;
3978
3979 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3980 if (err < 0) {
3981 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3982 WARN_ON(err == -EMSGSIZE);
3983 kfree_skb(skb);
3984 goto errout;
3985 }
3986 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3987 return;
3988 errout:
3989 if (err < 0)
3990 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3991 }
3992
3993 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3994 __s32 *array, int bytes)
3995 {
3996 BUG_ON(bytes < (DEVCONF_MAX * 4));
3997
3998 memset(array, 0, bytes);
3999 array[DEVCONF_FORWARDING] = cnf->forwarding;
4000 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4001 array[DEVCONF_MTU6] = cnf->mtu6;
4002 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4003 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4004 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4005 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4006 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4007 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4008 jiffies_to_msecs(cnf->rtr_solicit_interval);
4009 array[DEVCONF_RTR_SOLICIT_DELAY] =
4010 jiffies_to_msecs(cnf->rtr_solicit_delay);
4011 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4012 #ifdef CONFIG_IPV6_PRIVACY
4013 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4014 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4015 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4016 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4017 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4018 #endif
4019 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4020 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4021 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4022 #ifdef CONFIG_IPV6_ROUTER_PREF
4023 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4024 array[DEVCONF_RTR_PROBE_INTERVAL] =
4025 jiffies_to_msecs(cnf->rtr_probe_interval);
4026 #ifdef CONFIG_IPV6_ROUTE_INFO
4027 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4028 #endif
4029 #endif
4030 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4031 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4032 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4033 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4034 #endif
4035 #ifdef CONFIG_IPV6_MROUTE
4036 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4037 #endif
4038 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4039 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4040 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4041 }
4042
4043 static inline size_t inet6_ifla6_size(void)
4044 {
4045 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4046 + nla_total_size(sizeof(struct ifla_cacheinfo))
4047 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4048 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4049 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
4050 }
4051
4052 static inline size_t inet6_if_nlmsg_size(void)
4053 {
4054 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4055 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4056 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4057 + nla_total_size(4) /* IFLA_MTU */
4058 + nla_total_size(4) /* IFLA_LINK */
4059 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4060 }
4061
4062 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4063 int items, int bytes)
4064 {
4065 int i;
4066 int pad = bytes - sizeof(u64) * items;
4067 BUG_ON(pad < 0);
4068
4069 /* Use put_unaligned() because stats may not be aligned for u64. */
4070 put_unaligned(items, &stats[0]);
4071 for (i = 1; i < items; i++)
4072 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4073
4074 memset(&stats[items], 0, pad);
4075 }
4076
4077 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4078 int items, int bytes, size_t syncpoff)
4079 {
4080 int i;
4081 int pad = bytes - sizeof(u64) * items;
4082 BUG_ON(pad < 0);
4083
4084 /* Use put_unaligned() because stats may not be aligned for u64. */
4085 put_unaligned(items, &stats[0]);
4086 for (i = 1; i < items; i++)
4087 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4088
4089 memset(&stats[items], 0, pad);
4090 }
4091
4092 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4093 int bytes)
4094 {
4095 switch (attrtype) {
4096 case IFLA_INET6_STATS:
4097 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4098 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4099 break;
4100 case IFLA_INET6_ICMP6STATS:
4101 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4102 break;
4103 }
4104 }
4105
4106 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4107 {
4108 struct nlattr *nla;
4109 struct ifla_cacheinfo ci;
4110
4111 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4112 goto nla_put_failure;
4113 ci.max_reasm_len = IPV6_MAXPLEN;
4114 ci.tstamp = cstamp_delta(idev->tstamp);
4115 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4116 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4117 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4118 goto nla_put_failure;
4119 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4120 if (nla == NULL)
4121 goto nla_put_failure;
4122 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4123
4124 /* XXX - MC not implemented */
4125
4126 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4127 if (nla == NULL)
4128 goto nla_put_failure;
4129 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4130
4131 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4132 if (nla == NULL)
4133 goto nla_put_failure;
4134 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4135
4136 return 0;
4137
4138 nla_put_failure:
4139 return -EMSGSIZE;
4140 }
4141
4142 static size_t inet6_get_link_af_size(const struct net_device *dev)
4143 {
4144 if (!__in6_dev_get(dev))
4145 return 0;
4146
4147 return inet6_ifla6_size();
4148 }
4149
4150 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4151 {
4152 struct inet6_dev *idev = __in6_dev_get(dev);
4153
4154 if (!idev)
4155 return -ENODATA;
4156
4157 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4158 return -EMSGSIZE;
4159
4160 return 0;
4161 }
4162
4163 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4164 u32 portid, u32 seq, int event, unsigned int flags)
4165 {
4166 struct net_device *dev = idev->dev;
4167 struct ifinfomsg *hdr;
4168 struct nlmsghdr *nlh;
4169 void *protoinfo;
4170
4171 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4172 if (nlh == NULL)
4173 return -EMSGSIZE;
4174
4175 hdr = nlmsg_data(nlh);
4176 hdr->ifi_family = AF_INET6;
4177 hdr->__ifi_pad = 0;
4178 hdr->ifi_type = dev->type;
4179 hdr->ifi_index = dev->ifindex;
4180 hdr->ifi_flags = dev_get_flags(dev);
4181 hdr->ifi_change = 0;
4182
4183 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4184 (dev->addr_len &&
4185 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4186 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4187 (dev->ifindex != dev->iflink &&
4188 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4189 goto nla_put_failure;
4190 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4191 if (protoinfo == NULL)
4192 goto nla_put_failure;
4193
4194 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4195 goto nla_put_failure;
4196
4197 nla_nest_end(skb, protoinfo);
4198 return nlmsg_end(skb, nlh);
4199
4200 nla_put_failure:
4201 nlmsg_cancel(skb, nlh);
4202 return -EMSGSIZE;
4203 }
4204
4205 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4206 {
4207 struct net *net = sock_net(skb->sk);
4208 int h, s_h;
4209 int idx = 0, s_idx;
4210 struct net_device *dev;
4211 struct inet6_dev *idev;
4212 struct hlist_head *head;
4213 struct hlist_node *node;
4214
4215 s_h = cb->args[0];
4216 s_idx = cb->args[1];
4217
4218 rcu_read_lock();
4219 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4220 idx = 0;
4221 head = &net->dev_index_head[h];
4222 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4223 if (idx < s_idx)
4224 goto cont;
4225 idev = __in6_dev_get(dev);
4226 if (!idev)
4227 goto cont;
4228 if (inet6_fill_ifinfo(skb, idev,
4229 NETLINK_CB(cb->skb).portid,
4230 cb->nlh->nlmsg_seq,
4231 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4232 goto out;
4233 cont:
4234 idx++;
4235 }
4236 }
4237 out:
4238 rcu_read_unlock();
4239 cb->args[1] = idx;
4240 cb->args[0] = h;
4241
4242 return skb->len;
4243 }
4244
4245 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4246 {
4247 struct sk_buff *skb;
4248 struct net *net = dev_net(idev->dev);
4249 int err = -ENOBUFS;
4250
4251 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4252 if (skb == NULL)
4253 goto errout;
4254
4255 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4256 if (err < 0) {
4257 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4258 WARN_ON(err == -EMSGSIZE);
4259 kfree_skb(skb);
4260 goto errout;
4261 }
4262 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4263 return;
4264 errout:
4265 if (err < 0)
4266 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4267 }
4268
4269 static inline size_t inet6_prefix_nlmsg_size(void)
4270 {
4271 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4272 + nla_total_size(sizeof(struct in6_addr))
4273 + nla_total_size(sizeof(struct prefix_cacheinfo));
4274 }
4275
4276 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4277 struct prefix_info *pinfo, u32 portid, u32 seq,
4278 int event, unsigned int flags)
4279 {
4280 struct prefixmsg *pmsg;
4281 struct nlmsghdr *nlh;
4282 struct prefix_cacheinfo ci;
4283
4284 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4285 if (nlh == NULL)
4286 return -EMSGSIZE;
4287
4288 pmsg = nlmsg_data(nlh);
4289 pmsg->prefix_family = AF_INET6;
4290 pmsg->prefix_pad1 = 0;
4291 pmsg->prefix_pad2 = 0;
4292 pmsg->prefix_ifindex = idev->dev->ifindex;
4293 pmsg->prefix_len = pinfo->prefix_len;
4294 pmsg->prefix_type = pinfo->type;
4295 pmsg->prefix_pad3 = 0;
4296 pmsg->prefix_flags = 0;
4297 if (pinfo->onlink)
4298 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4299 if (pinfo->autoconf)
4300 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4301
4302 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4303 goto nla_put_failure;
4304 ci.preferred_time = ntohl(pinfo->prefered);
4305 ci.valid_time = ntohl(pinfo->valid);
4306 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4307 goto nla_put_failure;
4308 return nlmsg_end(skb, nlh);
4309
4310 nla_put_failure:
4311 nlmsg_cancel(skb, nlh);
4312 return -EMSGSIZE;
4313 }
4314
4315 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4316 struct prefix_info *pinfo)
4317 {
4318 struct sk_buff *skb;
4319 struct net *net = dev_net(idev->dev);
4320 int err = -ENOBUFS;
4321
4322 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4323 if (skb == NULL)
4324 goto errout;
4325
4326 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4327 if (err < 0) {
4328 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4329 WARN_ON(err == -EMSGSIZE);
4330 kfree_skb(skb);
4331 goto errout;
4332 }
4333 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4334 return;
4335 errout:
4336 if (err < 0)
4337 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4338 }
4339
4340 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4341 {
4342 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4343
4344 switch (event) {
4345 case RTM_NEWADDR:
4346 /*
4347 * If the address was optimistic
4348 * we inserted the route at the start of
4349 * our DAD process, so we don't need
4350 * to do it again
4351 */
4352 if (!(ifp->rt->rt6i_node))
4353 ip6_ins_rt(ifp->rt);
4354 if (ifp->idev->cnf.forwarding)
4355 addrconf_join_anycast(ifp);
4356 break;
4357 case RTM_DELADDR:
4358 if (ifp->idev->cnf.forwarding)
4359 addrconf_leave_anycast(ifp);
4360 addrconf_leave_solict(ifp->idev, &ifp->addr);
4361 dst_hold(&ifp->rt->dst);
4362
4363 if (ip6_del_rt(ifp->rt))
4364 dst_free(&ifp->rt->dst);
4365 break;
4366 }
4367 }
4368
4369 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4370 {
4371 rcu_read_lock_bh();
4372 if (likely(ifp->idev->dead == 0))
4373 __ipv6_ifa_notify(event, ifp);
4374 rcu_read_unlock_bh();
4375 }
4376
4377 #ifdef CONFIG_SYSCTL
4378
4379 static
4380 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4381 void __user *buffer, size_t *lenp, loff_t *ppos)
4382 {
4383 int *valp = ctl->data;
4384 int val = *valp;
4385 loff_t pos = *ppos;
4386 ctl_table lctl;
4387 int ret;
4388
4389 /*
4390 * ctl->data points to idev->cnf.forwarding, we should
4391 * not modify it until we get the rtnl lock.
4392 */
4393 lctl = *ctl;
4394 lctl.data = &val;
4395
4396 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4397
4398 if (write)
4399 ret = addrconf_fixup_forwarding(ctl, valp, val);
4400 if (ret)
4401 *ppos = pos;
4402 return ret;
4403 }
4404
4405 static void dev_disable_change(struct inet6_dev *idev)
4406 {
4407 if (!idev || !idev->dev)
4408 return;
4409
4410 if (idev->cnf.disable_ipv6)
4411 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4412 else
4413 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4414 }
4415
4416 static void addrconf_disable_change(struct net *net, __s32 newf)
4417 {
4418 struct net_device *dev;
4419 struct inet6_dev *idev;
4420
4421 rcu_read_lock();
4422 for_each_netdev_rcu(net, dev) {
4423 idev = __in6_dev_get(dev);
4424 if (idev) {
4425 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4426 idev->cnf.disable_ipv6 = newf;
4427 if (changed)
4428 dev_disable_change(idev);
4429 }
4430 }
4431 rcu_read_unlock();
4432 }
4433
4434 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4435 {
4436 struct net *net;
4437 int old;
4438
4439 if (!rtnl_trylock())
4440 return restart_syscall();
4441
4442 net = (struct net *)table->extra2;
4443 old = *p;
4444 *p = newf;
4445
4446 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4447 rtnl_unlock();
4448 return 0;
4449 }
4450
4451 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4452 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4453 addrconf_disable_change(net, newf);
4454 } else if ((!newf) ^ (!old))
4455 dev_disable_change((struct inet6_dev *)table->extra1);
4456
4457 rtnl_unlock();
4458 return 0;
4459 }
4460
4461 static
4462 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4463 void __user *buffer, size_t *lenp, loff_t *ppos)
4464 {
4465 int *valp = ctl->data;
4466 int val = *valp;
4467 loff_t pos = *ppos;
4468 ctl_table lctl;
4469 int ret;
4470
4471 /*
4472 * ctl->data points to idev->cnf.disable_ipv6, we should
4473 * not modify it until we get the rtnl lock.
4474 */
4475 lctl = *ctl;
4476 lctl.data = &val;
4477
4478 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4479
4480 if (write)
4481 ret = addrconf_disable_ipv6(ctl, valp, val);
4482 if (ret)
4483 *ppos = pos;
4484 return ret;
4485 }
4486
4487 static struct addrconf_sysctl_table
4488 {
4489 struct ctl_table_header *sysctl_header;
4490 ctl_table addrconf_vars[DEVCONF_MAX+1];
4491 } addrconf_sysctl __read_mostly = {
4492 .sysctl_header = NULL,
4493 .addrconf_vars = {
4494 {
4495 .procname = "forwarding",
4496 .data = &ipv6_devconf.forwarding,
4497 .maxlen = sizeof(int),
4498 .mode = 0644,
4499 .proc_handler = addrconf_sysctl_forward,
4500 },
4501 {
4502 .procname = "hop_limit",
4503 .data = &ipv6_devconf.hop_limit,
4504 .maxlen = sizeof(int),
4505 .mode = 0644,
4506 .proc_handler = proc_dointvec,
4507 },
4508 {
4509 .procname = "mtu",
4510 .data = &ipv6_devconf.mtu6,
4511 .maxlen = sizeof(int),
4512 .mode = 0644,
4513 .proc_handler = proc_dointvec,
4514 },
4515 {
4516 .procname = "accept_ra",
4517 .data = &ipv6_devconf.accept_ra,
4518 .maxlen = sizeof(int),
4519 .mode = 0644,
4520 .proc_handler = proc_dointvec,
4521 },
4522 {
4523 .procname = "accept_redirects",
4524 .data = &ipv6_devconf.accept_redirects,
4525 .maxlen = sizeof(int),
4526 .mode = 0644,
4527 .proc_handler = proc_dointvec,
4528 },
4529 {
4530 .procname = "autoconf",
4531 .data = &ipv6_devconf.autoconf,
4532 .maxlen = sizeof(int),
4533 .mode = 0644,
4534 .proc_handler = proc_dointvec,
4535 },
4536 {
4537 .procname = "dad_transmits",
4538 .data = &ipv6_devconf.dad_transmits,
4539 .maxlen = sizeof(int),
4540 .mode = 0644,
4541 .proc_handler = proc_dointvec,
4542 },
4543 {
4544 .procname = "router_solicitations",
4545 .data = &ipv6_devconf.rtr_solicits,
4546 .maxlen = sizeof(int),
4547 .mode = 0644,
4548 .proc_handler = proc_dointvec,
4549 },
4550 {
4551 .procname = "router_solicitation_interval",
4552 .data = &ipv6_devconf.rtr_solicit_interval,
4553 .maxlen = sizeof(int),
4554 .mode = 0644,
4555 .proc_handler = proc_dointvec_jiffies,
4556 },
4557 {
4558 .procname = "router_solicitation_delay",
4559 .data = &ipv6_devconf.rtr_solicit_delay,
4560 .maxlen = sizeof(int),
4561 .mode = 0644,
4562 .proc_handler = proc_dointvec_jiffies,
4563 },
4564 {
4565 .procname = "force_mld_version",
4566 .data = &ipv6_devconf.force_mld_version,
4567 .maxlen = sizeof(int),
4568 .mode = 0644,
4569 .proc_handler = proc_dointvec,
4570 },
4571 #ifdef CONFIG_IPV6_PRIVACY
4572 {
4573 .procname = "use_tempaddr",
4574 .data = &ipv6_devconf.use_tempaddr,
4575 .maxlen = sizeof(int),
4576 .mode = 0644,
4577 .proc_handler = proc_dointvec,
4578 },
4579 {
4580 .procname = "temp_valid_lft",
4581 .data = &ipv6_devconf.temp_valid_lft,
4582 .maxlen = sizeof(int),
4583 .mode = 0644,
4584 .proc_handler = proc_dointvec,
4585 },
4586 {
4587 .procname = "temp_prefered_lft",
4588 .data = &ipv6_devconf.temp_prefered_lft,
4589 .maxlen = sizeof(int),
4590 .mode = 0644,
4591 .proc_handler = proc_dointvec,
4592 },
4593 {
4594 .procname = "regen_max_retry",
4595 .data = &ipv6_devconf.regen_max_retry,
4596 .maxlen = sizeof(int),
4597 .mode = 0644,
4598 .proc_handler = proc_dointvec,
4599 },
4600 {
4601 .procname = "max_desync_factor",
4602 .data = &ipv6_devconf.max_desync_factor,
4603 .maxlen = sizeof(int),
4604 .mode = 0644,
4605 .proc_handler = proc_dointvec,
4606 },
4607 #endif
4608 {
4609 .procname = "max_addresses",
4610 .data = &ipv6_devconf.max_addresses,
4611 .maxlen = sizeof(int),
4612 .mode = 0644,
4613 .proc_handler = proc_dointvec,
4614 },
4615 {
4616 .procname = "accept_ra_defrtr",
4617 .data = &ipv6_devconf.accept_ra_defrtr,
4618 .maxlen = sizeof(int),
4619 .mode = 0644,
4620 .proc_handler = proc_dointvec,
4621 },
4622 {
4623 .procname = "accept_ra_pinfo",
4624 .data = &ipv6_devconf.accept_ra_pinfo,
4625 .maxlen = sizeof(int),
4626 .mode = 0644,
4627 .proc_handler = proc_dointvec,
4628 },
4629 #ifdef CONFIG_IPV6_ROUTER_PREF
4630 {
4631 .procname = "accept_ra_rtr_pref",
4632 .data = &ipv6_devconf.accept_ra_rtr_pref,
4633 .maxlen = sizeof(int),
4634 .mode = 0644,
4635 .proc_handler = proc_dointvec,
4636 },
4637 {
4638 .procname = "router_probe_interval",
4639 .data = &ipv6_devconf.rtr_probe_interval,
4640 .maxlen = sizeof(int),
4641 .mode = 0644,
4642 .proc_handler = proc_dointvec_jiffies,
4643 },
4644 #ifdef CONFIG_IPV6_ROUTE_INFO
4645 {
4646 .procname = "accept_ra_rt_info_max_plen",
4647 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4648 .maxlen = sizeof(int),
4649 .mode = 0644,
4650 .proc_handler = proc_dointvec,
4651 },
4652 #endif
4653 #endif
4654 {
4655 .procname = "proxy_ndp",
4656 .data = &ipv6_devconf.proxy_ndp,
4657 .maxlen = sizeof(int),
4658 .mode = 0644,
4659 .proc_handler = proc_dointvec,
4660 },
4661 {
4662 .procname = "accept_source_route",
4663 .data = &ipv6_devconf.accept_source_route,
4664 .maxlen = sizeof(int),
4665 .mode = 0644,
4666 .proc_handler = proc_dointvec,
4667 },
4668 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4669 {
4670 .procname = "optimistic_dad",
4671 .data = &ipv6_devconf.optimistic_dad,
4672 .maxlen = sizeof(int),
4673 .mode = 0644,
4674 .proc_handler = proc_dointvec,
4675
4676 },
4677 #endif
4678 #ifdef CONFIG_IPV6_MROUTE
4679 {
4680 .procname = "mc_forwarding",
4681 .data = &ipv6_devconf.mc_forwarding,
4682 .maxlen = sizeof(int),
4683 .mode = 0444,
4684 .proc_handler = proc_dointvec,
4685 },
4686 #endif
4687 {
4688 .procname = "disable_ipv6",
4689 .data = &ipv6_devconf.disable_ipv6,
4690 .maxlen = sizeof(int),
4691 .mode = 0644,
4692 .proc_handler = addrconf_sysctl_disable,
4693 },
4694 {
4695 .procname = "accept_dad",
4696 .data = &ipv6_devconf.accept_dad,
4697 .maxlen = sizeof(int),
4698 .mode = 0644,
4699 .proc_handler = proc_dointvec,
4700 },
4701 {
4702 .procname = "force_tllao",
4703 .data = &ipv6_devconf.force_tllao,
4704 .maxlen = sizeof(int),
4705 .mode = 0644,
4706 .proc_handler = proc_dointvec
4707 },
4708 {
4709 /* sentinel */
4710 }
4711 },
4712 };
4713
4714 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4715 struct inet6_dev *idev, struct ipv6_devconf *p)
4716 {
4717 int i;
4718 struct addrconf_sysctl_table *t;
4719 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4720
4721 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4722 if (t == NULL)
4723 goto out;
4724
4725 for (i = 0; t->addrconf_vars[i].data; i++) {
4726 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4727 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4728 t->addrconf_vars[i].extra2 = net;
4729 }
4730
4731 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4732
4733 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4734 if (t->sysctl_header == NULL)
4735 goto free;
4736
4737 p->sysctl = t;
4738 return 0;
4739
4740 free:
4741 kfree(t);
4742 out:
4743 return -ENOBUFS;
4744 }
4745
4746 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4747 {
4748 struct addrconf_sysctl_table *t;
4749
4750 if (p->sysctl == NULL)
4751 return;
4752
4753 t = p->sysctl;
4754 p->sysctl = NULL;
4755 unregister_net_sysctl_table(t->sysctl_header);
4756 kfree(t);
4757 }
4758
4759 static void addrconf_sysctl_register(struct inet6_dev *idev)
4760 {
4761 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4762 &ndisc_ifinfo_sysctl_change);
4763 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4764 idev, &idev->cnf);
4765 }
4766
4767 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4768 {
4769 __addrconf_sysctl_unregister(&idev->cnf);
4770 neigh_sysctl_unregister(idev->nd_parms);
4771 }
4772
4773
4774 #endif
4775
4776 static int __net_init addrconf_init_net(struct net *net)
4777 {
4778 int err;
4779 struct ipv6_devconf *all, *dflt;
4780
4781 err = -ENOMEM;
4782 all = &ipv6_devconf;
4783 dflt = &ipv6_devconf_dflt;
4784
4785 if (!net_eq(net, &init_net)) {
4786 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4787 if (all == NULL)
4788 goto err_alloc_all;
4789
4790 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4791 if (dflt == NULL)
4792 goto err_alloc_dflt;
4793 } else {
4794 /* these will be inherited by all namespaces */
4795 dflt->autoconf = ipv6_defaults.autoconf;
4796 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4797 }
4798
4799 net->ipv6.devconf_all = all;
4800 net->ipv6.devconf_dflt = dflt;
4801
4802 #ifdef CONFIG_SYSCTL
4803 err = __addrconf_sysctl_register(net, "all", NULL, all);
4804 if (err < 0)
4805 goto err_reg_all;
4806
4807 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4808 if (err < 0)
4809 goto err_reg_dflt;
4810 #endif
4811 return 0;
4812
4813 #ifdef CONFIG_SYSCTL
4814 err_reg_dflt:
4815 __addrconf_sysctl_unregister(all);
4816 err_reg_all:
4817 kfree(dflt);
4818 #endif
4819 err_alloc_dflt:
4820 kfree(all);
4821 err_alloc_all:
4822 return err;
4823 }
4824
4825 static void __net_exit addrconf_exit_net(struct net *net)
4826 {
4827 #ifdef CONFIG_SYSCTL
4828 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4829 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4830 #endif
4831 if (!net_eq(net, &init_net)) {
4832 kfree(net->ipv6.devconf_dflt);
4833 kfree(net->ipv6.devconf_all);
4834 }
4835 }
4836
4837 static struct pernet_operations addrconf_ops = {
4838 .init = addrconf_init_net,
4839 .exit = addrconf_exit_net,
4840 };
4841
4842 /*
4843 * Device notifier
4844 */
4845
4846 int register_inet6addr_notifier(struct notifier_block *nb)
4847 {
4848 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4849 }
4850 EXPORT_SYMBOL(register_inet6addr_notifier);
4851
4852 int unregister_inet6addr_notifier(struct notifier_block *nb)
4853 {
4854 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4855 }
4856 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4857
4858 static struct rtnl_af_ops inet6_ops = {
4859 .family = AF_INET6,
4860 .fill_link_af = inet6_fill_link_af,
4861 .get_link_af_size = inet6_get_link_af_size,
4862 };
4863
4864 /*
4865 * Init / cleanup code
4866 */
4867
4868 int __init addrconf_init(void)
4869 {
4870 int i, err;
4871
4872 err = ipv6_addr_label_init();
4873 if (err < 0) {
4874 pr_crit("%s: cannot initialize default policy table: %d\n",
4875 __func__, err);
4876 goto out;
4877 }
4878
4879 err = register_pernet_subsys(&addrconf_ops);
4880 if (err < 0)
4881 goto out_addrlabel;
4882
4883 /* The addrconf netdev notifier requires that loopback_dev
4884 * has it's ipv6 private information allocated and setup
4885 * before it can bring up and give link-local addresses
4886 * to other devices which are up.
4887 *
4888 * Unfortunately, loopback_dev is not necessarily the first
4889 * entry in the global dev_base list of net devices. In fact,
4890 * it is likely to be the very last entry on that list.
4891 * So this causes the notifier registry below to try and
4892 * give link-local addresses to all devices besides loopback_dev
4893 * first, then loopback_dev, which cases all the non-loopback_dev
4894 * devices to fail to get a link-local address.
4895 *
4896 * So, as a temporary fix, allocate the ipv6 structure for
4897 * loopback_dev first by hand.
4898 * Longer term, all of the dependencies ipv6 has upon the loopback
4899 * device and it being up should be removed.
4900 */
4901 rtnl_lock();
4902 if (!ipv6_add_dev(init_net.loopback_dev))
4903 err = -ENOMEM;
4904 rtnl_unlock();
4905 if (err)
4906 goto errlo;
4907
4908 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4909 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4910
4911 register_netdevice_notifier(&ipv6_dev_notf);
4912
4913 addrconf_verify(0);
4914
4915 err = rtnl_af_register(&inet6_ops);
4916 if (err < 0)
4917 goto errout_af;
4918
4919 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4920 NULL);
4921 if (err < 0)
4922 goto errout;
4923
4924 /* Only the first call to __rtnl_register can fail */
4925 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4926 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4927 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4928 inet6_dump_ifaddr, NULL);
4929 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4930 inet6_dump_ifmcaddr, NULL);
4931 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4932 inet6_dump_ifacaddr, NULL);
4933 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
4934 NULL, NULL);
4935
4936 ipv6_addr_label_rtnl_register();
4937
4938 return 0;
4939 errout:
4940 rtnl_af_unregister(&inet6_ops);
4941 errout_af:
4942 unregister_netdevice_notifier(&ipv6_dev_notf);
4943 errlo:
4944 unregister_pernet_subsys(&addrconf_ops);
4945 out_addrlabel:
4946 ipv6_addr_label_cleanup();
4947 out:
4948 return err;
4949 }
4950
4951 void addrconf_cleanup(void)
4952 {
4953 struct net_device *dev;
4954 int i;
4955
4956 unregister_netdevice_notifier(&ipv6_dev_notf);
4957 unregister_pernet_subsys(&addrconf_ops);
4958 ipv6_addr_label_cleanup();
4959
4960 rtnl_lock();
4961
4962 __rtnl_af_unregister(&inet6_ops);
4963
4964 /* clean dev list */
4965 for_each_netdev(&init_net, dev) {
4966 if (__in6_dev_get(dev) == NULL)
4967 continue;
4968 addrconf_ifdown(dev, 1);
4969 }
4970 addrconf_ifdown(init_net.loopback_dev, 2);
4971
4972 /*
4973 * Check hash table.
4974 */
4975 spin_lock_bh(&addrconf_hash_lock);
4976 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4977 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4978 spin_unlock_bh(&addrconf_hash_lock);
4979
4980 del_timer(&addr_chk_timer);
4981 rtnl_unlock();
4982 }
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