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Merge tag 'uapi-20121219' into for-linus
[deliverable/linux.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/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 struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
158 int plen,
159 const struct net_device *dev,
160 u32 flags, u32 noflags);
161
162 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
163 static void addrconf_dad_timer(unsigned long data);
164 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
165 static void addrconf_dad_run(struct inet6_dev *idev);
166 static void addrconf_rs_timer(unsigned long data);
167 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
168 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
169
170 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
171 struct prefix_info *pinfo);
172 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
173 struct net_device *dev);
174
175 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
176
177 static struct ipv6_devconf ipv6_devconf __read_mostly = {
178 .forwarding = 0,
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
181 .accept_ra = 1,
182 .accept_redirects = 1,
183 .autoconf = 1,
184 .force_mld_version = 0,
185 .dad_transmits = 1,
186 .rtr_solicits = MAX_RTR_SOLICITATIONS,
187 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
188 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
189 #ifdef CONFIG_IPV6_PRIVACY
190 .use_tempaddr = 0,
191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
195 #endif
196 .max_addresses = IPV6_MAX_ADDRESSES,
197 .accept_ra_defrtr = 1,
198 .accept_ra_pinfo = 1,
199 #ifdef CONFIG_IPV6_ROUTER_PREF
200 .accept_ra_rtr_pref = 1,
201 .rtr_probe_interval = 60 * HZ,
202 #ifdef CONFIG_IPV6_ROUTE_INFO
203 .accept_ra_rt_info_max_plen = 0,
204 #endif
205 #endif
206 .proxy_ndp = 0,
207 .accept_source_route = 0, /* we do not accept RH0 by default. */
208 .disable_ipv6 = 0,
209 .accept_dad = 1,
210 };
211
212 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
213 .forwarding = 0,
214 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
215 .mtu6 = IPV6_MIN_MTU,
216 .accept_ra = 1,
217 .accept_redirects = 1,
218 .autoconf = 1,
219 .dad_transmits = 1,
220 .rtr_solicits = MAX_RTR_SOLICITATIONS,
221 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
222 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
223 #ifdef CONFIG_IPV6_PRIVACY
224 .use_tempaddr = 0,
225 .temp_valid_lft = TEMP_VALID_LIFETIME,
226 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
227 .regen_max_retry = REGEN_MAX_RETRY,
228 .max_desync_factor = MAX_DESYNC_FACTOR,
229 #endif
230 .max_addresses = IPV6_MAX_ADDRESSES,
231 .accept_ra_defrtr = 1,
232 .accept_ra_pinfo = 1,
233 #ifdef CONFIG_IPV6_ROUTER_PREF
234 .accept_ra_rtr_pref = 1,
235 .rtr_probe_interval = 60 * HZ,
236 #ifdef CONFIG_IPV6_ROUTE_INFO
237 .accept_ra_rt_info_max_plen = 0,
238 #endif
239 #endif
240 .proxy_ndp = 0,
241 .accept_source_route = 0, /* we do not accept RH0 by default. */
242 .disable_ipv6 = 0,
243 .accept_dad = 1,
244 };
245
246 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
247 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
248 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
249 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
250 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
251
252 /* Check if a valid qdisc is available */
253 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
254 {
255 return !qdisc_tx_is_noop(dev);
256 }
257
258 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
259 {
260 if (del_timer(&ifp->timer))
261 __in6_ifa_put(ifp);
262 }
263
264 enum addrconf_timer_t {
265 AC_NONE,
266 AC_DAD,
267 AC_RS,
268 };
269
270 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
271 enum addrconf_timer_t what,
272 unsigned long when)
273 {
274 if (!del_timer(&ifp->timer))
275 in6_ifa_hold(ifp);
276
277 switch (what) {
278 case AC_DAD:
279 ifp->timer.function = addrconf_dad_timer;
280 break;
281 case AC_RS:
282 ifp->timer.function = addrconf_rs_timer;
283 break;
284 default:
285 break;
286 }
287 ifp->timer.expires = jiffies + when;
288 add_timer(&ifp->timer);
289 }
290
291 static int snmp6_alloc_dev(struct inet6_dev *idev)
292 {
293 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
294 sizeof(struct ipstats_mib),
295 __alignof__(struct ipstats_mib)) < 0)
296 goto err_ip;
297 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
298 GFP_KERNEL);
299 if (!idev->stats.icmpv6dev)
300 goto err_icmp;
301 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
302 GFP_KERNEL);
303 if (!idev->stats.icmpv6msgdev)
304 goto err_icmpmsg;
305
306 return 0;
307
308 err_icmpmsg:
309 kfree(idev->stats.icmpv6dev);
310 err_icmp:
311 snmp_mib_free((void __percpu **)idev->stats.ipv6);
312 err_ip:
313 return -ENOMEM;
314 }
315
316 static void snmp6_free_dev(struct inet6_dev *idev)
317 {
318 kfree(idev->stats.icmpv6msgdev);
319 kfree(idev->stats.icmpv6dev);
320 snmp_mib_free((void __percpu **)idev->stats.ipv6);
321 }
322
323 /* Nobody refers to this device, we may destroy it. */
324
325 void in6_dev_finish_destroy(struct inet6_dev *idev)
326 {
327 struct net_device *dev = idev->dev;
328
329 WARN_ON(!list_empty(&idev->addr_list));
330 WARN_ON(idev->mc_list != NULL);
331
332 #ifdef NET_REFCNT_DEBUG
333 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
334 #endif
335 dev_put(dev);
336 if (!idev->dead) {
337 pr_warn("Freeing alive inet6 device %p\n", idev);
338 return;
339 }
340 snmp6_free_dev(idev);
341 kfree_rcu(idev, rcu);
342 }
343 EXPORT_SYMBOL(in6_dev_finish_destroy);
344
345 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
346 {
347 struct inet6_dev *ndev;
348
349 ASSERT_RTNL();
350
351 if (dev->mtu < IPV6_MIN_MTU)
352 return NULL;
353
354 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
355
356 if (ndev == NULL)
357 return NULL;
358
359 rwlock_init(&ndev->lock);
360 ndev->dev = dev;
361 INIT_LIST_HEAD(&ndev->addr_list);
362
363 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
364 ndev->cnf.mtu6 = dev->mtu;
365 ndev->cnf.sysctl = NULL;
366 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
367 if (ndev->nd_parms == NULL) {
368 kfree(ndev);
369 return NULL;
370 }
371 if (ndev->cnf.forwarding)
372 dev_disable_lro(dev);
373 /* We refer to the device */
374 dev_hold(dev);
375
376 if (snmp6_alloc_dev(ndev) < 0) {
377 ADBG((KERN_WARNING
378 "%s: cannot allocate memory for statistics; dev=%s.\n",
379 __func__, dev->name));
380 neigh_parms_release(&nd_tbl, ndev->nd_parms);
381 dev_put(dev);
382 kfree(ndev);
383 return NULL;
384 }
385
386 if (snmp6_register_dev(ndev) < 0) {
387 ADBG((KERN_WARNING
388 "%s: cannot create /proc/net/dev_snmp6/%s\n",
389 __func__, dev->name));
390 neigh_parms_release(&nd_tbl, ndev->nd_parms);
391 ndev->dead = 1;
392 in6_dev_finish_destroy(ndev);
393 return NULL;
394 }
395
396 /* One reference from device. We must do this before
397 * we invoke __ipv6_regen_rndid().
398 */
399 in6_dev_hold(ndev);
400
401 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
402 ndev->cnf.accept_dad = -1;
403
404 #if IS_ENABLED(CONFIG_IPV6_SIT)
405 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
406 pr_info("%s: Disabled Multicast RS\n", dev->name);
407 ndev->cnf.rtr_solicits = 0;
408 }
409 #endif
410
411 #ifdef CONFIG_IPV6_PRIVACY
412 INIT_LIST_HEAD(&ndev->tempaddr_list);
413 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
414 if ((dev->flags&IFF_LOOPBACK) ||
415 dev->type == ARPHRD_TUNNEL ||
416 dev->type == ARPHRD_TUNNEL6 ||
417 dev->type == ARPHRD_SIT ||
418 dev->type == ARPHRD_NONE) {
419 ndev->cnf.use_tempaddr = -1;
420 } else {
421 in6_dev_hold(ndev);
422 ipv6_regen_rndid((unsigned long) ndev);
423 }
424 #endif
425
426 if (netif_running(dev) && addrconf_qdisc_ok(dev))
427 ndev->if_flags |= IF_READY;
428
429 ipv6_mc_init_dev(ndev);
430 ndev->tstamp = jiffies;
431 addrconf_sysctl_register(ndev);
432 /* protected by rtnl_lock */
433 rcu_assign_pointer(dev->ip6_ptr, ndev);
434
435 /* Join all-node multicast group */
436 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
437
438 /* Join all-router multicast group if forwarding is set */
439 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
440 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
441
442 return ndev;
443 }
444
445 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
446 {
447 struct inet6_dev *idev;
448
449 ASSERT_RTNL();
450
451 idev = __in6_dev_get(dev);
452 if (!idev) {
453 idev = ipv6_add_dev(dev);
454 if (!idev)
455 return NULL;
456 }
457
458 if (dev->flags&IFF_UP)
459 ipv6_mc_up(idev);
460 return idev;
461 }
462
463 static int inet6_netconf_msgsize_devconf(int type)
464 {
465 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
466 + nla_total_size(4); /* NETCONFA_IFINDEX */
467
468 /* type -1 is used for ALL */
469 if (type == -1 || type == NETCONFA_FORWARDING)
470 size += nla_total_size(4);
471 #ifdef CONFIG_IPV6_MROUTE
472 if (type == -1 || type == NETCONFA_MC_FORWARDING)
473 size += nla_total_size(4);
474 #endif
475
476 return size;
477 }
478
479 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
480 struct ipv6_devconf *devconf, u32 portid,
481 u32 seq, int event, unsigned int flags,
482 int type)
483 {
484 struct nlmsghdr *nlh;
485 struct netconfmsg *ncm;
486
487 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
488 flags);
489 if (nlh == NULL)
490 return -EMSGSIZE;
491
492 ncm = nlmsg_data(nlh);
493 ncm->ncm_family = AF_INET6;
494
495 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
496 goto nla_put_failure;
497
498 /* type -1 is used for ALL */
499 if ((type == -1 || type == NETCONFA_FORWARDING) &&
500 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
501 goto nla_put_failure;
502 #ifdef CONFIG_IPV6_MROUTE
503 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
504 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
505 devconf->mc_forwarding) < 0)
506 goto nla_put_failure;
507 #endif
508 return nlmsg_end(skb, nlh);
509
510 nla_put_failure:
511 nlmsg_cancel(skb, nlh);
512 return -EMSGSIZE;
513 }
514
515 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
516 struct ipv6_devconf *devconf)
517 {
518 struct sk_buff *skb;
519 int err = -ENOBUFS;
520
521 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
522 if (skb == NULL)
523 goto errout;
524
525 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
526 RTM_NEWNETCONF, 0, type);
527 if (err < 0) {
528 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
529 WARN_ON(err == -EMSGSIZE);
530 kfree_skb(skb);
531 goto errout;
532 }
533 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
534 return;
535 errout:
536 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
537 }
538
539 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
540 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
541 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
542 };
543
544 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
545 struct nlmsghdr *nlh,
546 void *arg)
547 {
548 struct net *net = sock_net(in_skb->sk);
549 struct nlattr *tb[NETCONFA_MAX+1];
550 struct netconfmsg *ncm;
551 struct sk_buff *skb;
552 struct ipv6_devconf *devconf;
553 struct inet6_dev *in6_dev;
554 struct net_device *dev;
555 int ifindex;
556 int err;
557
558 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
559 devconf_ipv6_policy);
560 if (err < 0)
561 goto errout;
562
563 err = EINVAL;
564 if (!tb[NETCONFA_IFINDEX])
565 goto errout;
566
567 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
568 switch (ifindex) {
569 case NETCONFA_IFINDEX_ALL:
570 devconf = net->ipv6.devconf_all;
571 break;
572 case NETCONFA_IFINDEX_DEFAULT:
573 devconf = net->ipv6.devconf_dflt;
574 break;
575 default:
576 dev = __dev_get_by_index(net, ifindex);
577 if (dev == NULL)
578 goto errout;
579 in6_dev = __in6_dev_get(dev);
580 if (in6_dev == NULL)
581 goto errout;
582 devconf = &in6_dev->cnf;
583 break;
584 }
585
586 err = -ENOBUFS;
587 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
588 if (skb == NULL)
589 goto errout;
590
591 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
592 NETLINK_CB(in_skb).portid,
593 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
594 -1);
595 if (err < 0) {
596 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
597 WARN_ON(err == -EMSGSIZE);
598 kfree_skb(skb);
599 goto errout;
600 }
601 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
602 errout:
603 return err;
604 }
605
606 #ifdef CONFIG_SYSCTL
607 static void dev_forward_change(struct inet6_dev *idev)
608 {
609 struct net_device *dev;
610 struct inet6_ifaddr *ifa;
611
612 if (!idev)
613 return;
614 dev = idev->dev;
615 if (idev->cnf.forwarding)
616 dev_disable_lro(dev);
617 if (dev->flags & IFF_MULTICAST) {
618 if (idev->cnf.forwarding)
619 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
620 else
621 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
622 }
623
624 list_for_each_entry(ifa, &idev->addr_list, if_list) {
625 if (ifa->flags&IFA_F_TENTATIVE)
626 continue;
627 if (idev->cnf.forwarding)
628 addrconf_join_anycast(ifa);
629 else
630 addrconf_leave_anycast(ifa);
631 }
632 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
633 dev->ifindex, &idev->cnf);
634 }
635
636
637 static void addrconf_forward_change(struct net *net, __s32 newf)
638 {
639 struct net_device *dev;
640 struct inet6_dev *idev;
641
642 for_each_netdev(net, dev) {
643 idev = __in6_dev_get(dev);
644 if (idev) {
645 int changed = (!idev->cnf.forwarding) ^ (!newf);
646 idev->cnf.forwarding = newf;
647 if (changed)
648 dev_forward_change(idev);
649 }
650 }
651 }
652
653 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
654 {
655 struct net *net;
656 int old;
657
658 if (!rtnl_trylock())
659 return restart_syscall();
660
661 net = (struct net *)table->extra2;
662 old = *p;
663 *p = newf;
664
665 if (p == &net->ipv6.devconf_dflt->forwarding) {
666 if ((!newf) ^ (!old))
667 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
668 NETCONFA_IFINDEX_DEFAULT,
669 net->ipv6.devconf_dflt);
670 rtnl_unlock();
671 return 0;
672 }
673
674 if (p == &net->ipv6.devconf_all->forwarding) {
675 net->ipv6.devconf_dflt->forwarding = newf;
676 addrconf_forward_change(net, newf);
677 if ((!newf) ^ (!old))
678 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
679 NETCONFA_IFINDEX_ALL,
680 net->ipv6.devconf_all);
681 } else if ((!newf) ^ (!old))
682 dev_forward_change((struct inet6_dev *)table->extra1);
683 rtnl_unlock();
684
685 if (newf)
686 rt6_purge_dflt_routers(net);
687 return 1;
688 }
689 #endif
690
691 /* Nobody refers to this ifaddr, destroy it */
692 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
693 {
694 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
695
696 #ifdef NET_REFCNT_DEBUG
697 pr_debug("%s\n", __func__);
698 #endif
699
700 in6_dev_put(ifp->idev);
701
702 if (del_timer(&ifp->timer))
703 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
704
705 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
706 pr_warn("Freeing alive inet6 address %p\n", ifp);
707 return;
708 }
709 ip6_rt_put(ifp->rt);
710
711 kfree_rcu(ifp, rcu);
712 }
713
714 static void
715 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
716 {
717 struct list_head *p;
718 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
719
720 /*
721 * Each device address list is sorted in order of scope -
722 * global before linklocal.
723 */
724 list_for_each(p, &idev->addr_list) {
725 struct inet6_ifaddr *ifa
726 = list_entry(p, struct inet6_ifaddr, if_list);
727 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
728 break;
729 }
730
731 list_add_tail(&ifp->if_list, p);
732 }
733
734 static u32 inet6_addr_hash(const struct in6_addr *addr)
735 {
736 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
737 }
738
739 /* On success it returns ifp with increased reference count */
740
741 static struct inet6_ifaddr *
742 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
743 int scope, u32 flags)
744 {
745 struct inet6_ifaddr *ifa = NULL;
746 struct rt6_info *rt;
747 unsigned int hash;
748 int err = 0;
749 int addr_type = ipv6_addr_type(addr);
750
751 if (addr_type == IPV6_ADDR_ANY ||
752 addr_type & IPV6_ADDR_MULTICAST ||
753 (!(idev->dev->flags & IFF_LOOPBACK) &&
754 addr_type & IPV6_ADDR_LOOPBACK))
755 return ERR_PTR(-EADDRNOTAVAIL);
756
757 rcu_read_lock_bh();
758 if (idev->dead) {
759 err = -ENODEV; /*XXX*/
760 goto out2;
761 }
762
763 if (idev->cnf.disable_ipv6) {
764 err = -EACCES;
765 goto out2;
766 }
767
768 spin_lock(&addrconf_hash_lock);
769
770 /* Ignore adding duplicate addresses on an interface */
771 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
772 ADBG(("ipv6_add_addr: already assigned\n"));
773 err = -EEXIST;
774 goto out;
775 }
776
777 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
778
779 if (ifa == NULL) {
780 ADBG(("ipv6_add_addr: malloc failed\n"));
781 err = -ENOBUFS;
782 goto out;
783 }
784
785 rt = addrconf_dst_alloc(idev, addr, false);
786 if (IS_ERR(rt)) {
787 err = PTR_ERR(rt);
788 goto out;
789 }
790
791 ifa->addr = *addr;
792
793 spin_lock_init(&ifa->lock);
794 spin_lock_init(&ifa->state_lock);
795 init_timer(&ifa->timer);
796 INIT_HLIST_NODE(&ifa->addr_lst);
797 ifa->timer.data = (unsigned long) ifa;
798 ifa->scope = scope;
799 ifa->prefix_len = pfxlen;
800 ifa->flags = flags | IFA_F_TENTATIVE;
801 ifa->cstamp = ifa->tstamp = jiffies;
802
803 ifa->rt = rt;
804
805 ifa->idev = idev;
806 in6_dev_hold(idev);
807 /* For caller */
808 in6_ifa_hold(ifa);
809
810 /* Add to big hash table */
811 hash = inet6_addr_hash(addr);
812
813 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
814 spin_unlock(&addrconf_hash_lock);
815
816 write_lock(&idev->lock);
817 /* Add to inet6_dev unicast addr list. */
818 ipv6_link_dev_addr(idev, ifa);
819
820 #ifdef CONFIG_IPV6_PRIVACY
821 if (ifa->flags&IFA_F_TEMPORARY) {
822 list_add(&ifa->tmp_list, &idev->tempaddr_list);
823 in6_ifa_hold(ifa);
824 }
825 #endif
826
827 in6_ifa_hold(ifa);
828 write_unlock(&idev->lock);
829 out2:
830 rcu_read_unlock_bh();
831
832 if (likely(err == 0))
833 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
834 else {
835 kfree(ifa);
836 ifa = ERR_PTR(err);
837 }
838
839 return ifa;
840 out:
841 spin_unlock(&addrconf_hash_lock);
842 goto out2;
843 }
844
845 /* This function wants to get referenced ifp and releases it before return */
846
847 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
848 {
849 struct inet6_ifaddr *ifa, *ifn;
850 struct inet6_dev *idev = ifp->idev;
851 int state;
852 int deleted = 0, onlink = 0;
853 unsigned long expires = jiffies;
854
855 spin_lock_bh(&ifp->state_lock);
856 state = ifp->state;
857 ifp->state = INET6_IFADDR_STATE_DEAD;
858 spin_unlock_bh(&ifp->state_lock);
859
860 if (state == INET6_IFADDR_STATE_DEAD)
861 goto out;
862
863 spin_lock_bh(&addrconf_hash_lock);
864 hlist_del_init_rcu(&ifp->addr_lst);
865 spin_unlock_bh(&addrconf_hash_lock);
866
867 write_lock_bh(&idev->lock);
868 #ifdef CONFIG_IPV6_PRIVACY
869 if (ifp->flags&IFA_F_TEMPORARY) {
870 list_del(&ifp->tmp_list);
871 if (ifp->ifpub) {
872 in6_ifa_put(ifp->ifpub);
873 ifp->ifpub = NULL;
874 }
875 __in6_ifa_put(ifp);
876 }
877 #endif
878
879 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
880 if (ifa == ifp) {
881 list_del_init(&ifp->if_list);
882 __in6_ifa_put(ifp);
883
884 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
885 break;
886 deleted = 1;
887 continue;
888 } else if (ifp->flags & IFA_F_PERMANENT) {
889 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
890 ifp->prefix_len)) {
891 if (ifa->flags & IFA_F_PERMANENT) {
892 onlink = 1;
893 if (deleted)
894 break;
895 } else {
896 unsigned long lifetime;
897
898 if (!onlink)
899 onlink = -1;
900
901 spin_lock(&ifa->lock);
902
903 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
904 /*
905 * Note: Because this address is
906 * not permanent, lifetime <
907 * LONG_MAX / HZ here.
908 */
909 if (time_before(expires,
910 ifa->tstamp + lifetime * HZ))
911 expires = ifa->tstamp + lifetime * HZ;
912 spin_unlock(&ifa->lock);
913 }
914 }
915 }
916 }
917 write_unlock_bh(&idev->lock);
918
919 addrconf_del_timer(ifp);
920
921 ipv6_ifa_notify(RTM_DELADDR, ifp);
922
923 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
924
925 /*
926 * Purge or update corresponding prefix
927 *
928 * 1) we don't purge prefix here if address was not permanent.
929 * prefix is managed by its own lifetime.
930 * 2) if there're no addresses, delete prefix.
931 * 3) if there're still other permanent address(es),
932 * corresponding prefix is still permanent.
933 * 4) otherwise, update prefix lifetime to the
934 * longest valid lifetime among the corresponding
935 * addresses on the device.
936 * Note: subsequent RA will update lifetime.
937 *
938 * --yoshfuji
939 */
940 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
941 struct in6_addr prefix;
942 struct rt6_info *rt;
943
944 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
945
946 rt = addrconf_get_prefix_route(&prefix,
947 ifp->prefix_len,
948 ifp->idev->dev,
949 0, RTF_GATEWAY | RTF_DEFAULT);
950
951 if (rt) {
952 if (onlink == 0) {
953 ip6_del_rt(rt);
954 rt = NULL;
955 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
956 rt6_set_expires(rt, expires);
957 }
958 }
959 ip6_rt_put(rt);
960 }
961
962 /* clean up prefsrc entries */
963 rt6_remove_prefsrc(ifp);
964 out:
965 in6_ifa_put(ifp);
966 }
967
968 #ifdef CONFIG_IPV6_PRIVACY
969 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
970 {
971 struct inet6_dev *idev = ifp->idev;
972 struct in6_addr addr, *tmpaddr;
973 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
974 unsigned long regen_advance;
975 int tmp_plen;
976 int ret = 0;
977 int max_addresses;
978 u32 addr_flags;
979 unsigned long now = jiffies;
980
981 write_lock(&idev->lock);
982 if (ift) {
983 spin_lock_bh(&ift->lock);
984 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
985 spin_unlock_bh(&ift->lock);
986 tmpaddr = &addr;
987 } else {
988 tmpaddr = NULL;
989 }
990 retry:
991 in6_dev_hold(idev);
992 if (idev->cnf.use_tempaddr <= 0) {
993 write_unlock(&idev->lock);
994 pr_info("%s: use_tempaddr is disabled\n", __func__);
995 in6_dev_put(idev);
996 ret = -1;
997 goto out;
998 }
999 spin_lock_bh(&ifp->lock);
1000 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1001 idev->cnf.use_tempaddr = -1; /*XXX*/
1002 spin_unlock_bh(&ifp->lock);
1003 write_unlock(&idev->lock);
1004 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1005 __func__);
1006 in6_dev_put(idev);
1007 ret = -1;
1008 goto out;
1009 }
1010 in6_ifa_hold(ifp);
1011 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1012 __ipv6_try_regen_rndid(idev, tmpaddr);
1013 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1014 age = (now - ifp->tstamp) / HZ;
1015 tmp_valid_lft = min_t(__u32,
1016 ifp->valid_lft,
1017 idev->cnf.temp_valid_lft + age);
1018 tmp_prefered_lft = min_t(__u32,
1019 ifp->prefered_lft,
1020 idev->cnf.temp_prefered_lft + age -
1021 idev->cnf.max_desync_factor);
1022 tmp_plen = ifp->prefix_len;
1023 max_addresses = idev->cnf.max_addresses;
1024 tmp_tstamp = ifp->tstamp;
1025 spin_unlock_bh(&ifp->lock);
1026
1027 regen_advance = idev->cnf.regen_max_retry *
1028 idev->cnf.dad_transmits *
1029 idev->nd_parms->retrans_time / HZ;
1030 write_unlock(&idev->lock);
1031
1032 /* A temporary address is created only if this calculated Preferred
1033 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1034 * an implementation must not create a temporary address with a zero
1035 * Preferred Lifetime.
1036 */
1037 if (tmp_prefered_lft <= regen_advance) {
1038 in6_ifa_put(ifp);
1039 in6_dev_put(idev);
1040 ret = -1;
1041 goto out;
1042 }
1043
1044 addr_flags = IFA_F_TEMPORARY;
1045 /* set in addrconf_prefix_rcv() */
1046 if (ifp->flags & IFA_F_OPTIMISTIC)
1047 addr_flags |= IFA_F_OPTIMISTIC;
1048
1049 ift = !max_addresses ||
1050 ipv6_count_addresses(idev) < max_addresses ?
1051 ipv6_add_addr(idev, &addr, tmp_plen,
1052 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1053 addr_flags) : NULL;
1054 if (!ift || IS_ERR(ift)) {
1055 in6_ifa_put(ifp);
1056 in6_dev_put(idev);
1057 pr_info("%s: retry temporary address regeneration\n", __func__);
1058 tmpaddr = &addr;
1059 write_lock(&idev->lock);
1060 goto retry;
1061 }
1062
1063 spin_lock_bh(&ift->lock);
1064 ift->ifpub = ifp;
1065 ift->valid_lft = tmp_valid_lft;
1066 ift->prefered_lft = tmp_prefered_lft;
1067 ift->cstamp = now;
1068 ift->tstamp = tmp_tstamp;
1069 spin_unlock_bh(&ift->lock);
1070
1071 addrconf_dad_start(ift);
1072 in6_ifa_put(ift);
1073 in6_dev_put(idev);
1074 out:
1075 return ret;
1076 }
1077 #endif
1078
1079 /*
1080 * Choose an appropriate source address (RFC3484)
1081 */
1082 enum {
1083 IPV6_SADDR_RULE_INIT = 0,
1084 IPV6_SADDR_RULE_LOCAL,
1085 IPV6_SADDR_RULE_SCOPE,
1086 IPV6_SADDR_RULE_PREFERRED,
1087 #ifdef CONFIG_IPV6_MIP6
1088 IPV6_SADDR_RULE_HOA,
1089 #endif
1090 IPV6_SADDR_RULE_OIF,
1091 IPV6_SADDR_RULE_LABEL,
1092 #ifdef CONFIG_IPV6_PRIVACY
1093 IPV6_SADDR_RULE_PRIVACY,
1094 #endif
1095 IPV6_SADDR_RULE_ORCHID,
1096 IPV6_SADDR_RULE_PREFIX,
1097 IPV6_SADDR_RULE_MAX
1098 };
1099
1100 struct ipv6_saddr_score {
1101 int rule;
1102 int addr_type;
1103 struct inet6_ifaddr *ifa;
1104 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1105 int scopedist;
1106 int matchlen;
1107 };
1108
1109 struct ipv6_saddr_dst {
1110 const struct in6_addr *addr;
1111 int ifindex;
1112 int scope;
1113 int label;
1114 unsigned int prefs;
1115 };
1116
1117 static inline int ipv6_saddr_preferred(int type)
1118 {
1119 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1120 return 1;
1121 return 0;
1122 }
1123
1124 static int ipv6_get_saddr_eval(struct net *net,
1125 struct ipv6_saddr_score *score,
1126 struct ipv6_saddr_dst *dst,
1127 int i)
1128 {
1129 int ret;
1130
1131 if (i <= score->rule) {
1132 switch (i) {
1133 case IPV6_SADDR_RULE_SCOPE:
1134 ret = score->scopedist;
1135 break;
1136 case IPV6_SADDR_RULE_PREFIX:
1137 ret = score->matchlen;
1138 break;
1139 default:
1140 ret = !!test_bit(i, score->scorebits);
1141 }
1142 goto out;
1143 }
1144
1145 switch (i) {
1146 case IPV6_SADDR_RULE_INIT:
1147 /* Rule 0: remember if hiscore is not ready yet */
1148 ret = !!score->ifa;
1149 break;
1150 case IPV6_SADDR_RULE_LOCAL:
1151 /* Rule 1: Prefer same address */
1152 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1153 break;
1154 case IPV6_SADDR_RULE_SCOPE:
1155 /* Rule 2: Prefer appropriate scope
1156 *
1157 * ret
1158 * ^
1159 * -1 | d 15
1160 * ---+--+-+---> scope
1161 * |
1162 * | d is scope of the destination.
1163 * B-d | \
1164 * | \ <- smaller scope is better if
1165 * B-15 | \ if scope is enough for destinaion.
1166 * | ret = B - scope (-1 <= scope >= d <= 15).
1167 * d-C-1 | /
1168 * |/ <- greater is better
1169 * -C / if scope is not enough for destination.
1170 * /| ret = scope - C (-1 <= d < scope <= 15).
1171 *
1172 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1173 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1174 * Assume B = 0 and we get C > 29.
1175 */
1176 ret = __ipv6_addr_src_scope(score->addr_type);
1177 if (ret >= dst->scope)
1178 ret = -ret;
1179 else
1180 ret -= 128; /* 30 is enough */
1181 score->scopedist = ret;
1182 break;
1183 case IPV6_SADDR_RULE_PREFERRED:
1184 /* Rule 3: Avoid deprecated and optimistic addresses */
1185 ret = ipv6_saddr_preferred(score->addr_type) ||
1186 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1187 break;
1188 #ifdef CONFIG_IPV6_MIP6
1189 case IPV6_SADDR_RULE_HOA:
1190 {
1191 /* Rule 4: Prefer home address */
1192 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1193 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1194 break;
1195 }
1196 #endif
1197 case IPV6_SADDR_RULE_OIF:
1198 /* Rule 5: Prefer outgoing interface */
1199 ret = (!dst->ifindex ||
1200 dst->ifindex == score->ifa->idev->dev->ifindex);
1201 break;
1202 case IPV6_SADDR_RULE_LABEL:
1203 /* Rule 6: Prefer matching label */
1204 ret = ipv6_addr_label(net,
1205 &score->ifa->addr, score->addr_type,
1206 score->ifa->idev->dev->ifindex) == dst->label;
1207 break;
1208 #ifdef CONFIG_IPV6_PRIVACY
1209 case IPV6_SADDR_RULE_PRIVACY:
1210 {
1211 /* Rule 7: Prefer public address
1212 * Note: prefer temporary address if use_tempaddr >= 2
1213 */
1214 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1215 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1216 score->ifa->idev->cnf.use_tempaddr >= 2;
1217 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1218 break;
1219 }
1220 #endif
1221 case IPV6_SADDR_RULE_ORCHID:
1222 /* Rule 8-: Prefer ORCHID vs ORCHID or
1223 * non-ORCHID vs non-ORCHID
1224 */
1225 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1226 ipv6_addr_orchid(dst->addr));
1227 break;
1228 case IPV6_SADDR_RULE_PREFIX:
1229 /* Rule 8: Use longest matching prefix */
1230 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1231 if (ret > score->ifa->prefix_len)
1232 ret = score->ifa->prefix_len;
1233 score->matchlen = ret;
1234 break;
1235 default:
1236 ret = 0;
1237 }
1238
1239 if (ret)
1240 __set_bit(i, score->scorebits);
1241 score->rule = i;
1242 out:
1243 return ret;
1244 }
1245
1246 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1247 const struct in6_addr *daddr, unsigned int prefs,
1248 struct in6_addr *saddr)
1249 {
1250 struct ipv6_saddr_score scores[2],
1251 *score = &scores[0], *hiscore = &scores[1];
1252 struct ipv6_saddr_dst dst;
1253 struct net_device *dev;
1254 int dst_type;
1255
1256 dst_type = __ipv6_addr_type(daddr);
1257 dst.addr = daddr;
1258 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1259 dst.scope = __ipv6_addr_src_scope(dst_type);
1260 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1261 dst.prefs = prefs;
1262
1263 hiscore->rule = -1;
1264 hiscore->ifa = NULL;
1265
1266 rcu_read_lock();
1267
1268 for_each_netdev_rcu(net, dev) {
1269 struct inet6_dev *idev;
1270
1271 /* Candidate Source Address (section 4)
1272 * - multicast and link-local destination address,
1273 * the set of candidate source address MUST only
1274 * include addresses assigned to interfaces
1275 * belonging to the same link as the outgoing
1276 * interface.
1277 * (- For site-local destination addresses, the
1278 * set of candidate source addresses MUST only
1279 * include addresses assigned to interfaces
1280 * belonging to the same site as the outgoing
1281 * interface.)
1282 */
1283 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1284 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1285 dst.ifindex && dev->ifindex != dst.ifindex)
1286 continue;
1287
1288 idev = __in6_dev_get(dev);
1289 if (!idev)
1290 continue;
1291
1292 read_lock_bh(&idev->lock);
1293 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1294 int i;
1295
1296 /*
1297 * - Tentative Address (RFC2462 section 5.4)
1298 * - A tentative address is not considered
1299 * "assigned to an interface" in the traditional
1300 * sense, unless it is also flagged as optimistic.
1301 * - Candidate Source Address (section 4)
1302 * - In any case, anycast addresses, multicast
1303 * addresses, and the unspecified address MUST
1304 * NOT be included in a candidate set.
1305 */
1306 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1307 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1308 continue;
1309
1310 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1311
1312 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1313 score->addr_type & IPV6_ADDR_MULTICAST)) {
1314 LIMIT_NETDEBUG(KERN_DEBUG
1315 "ADDRCONF: unspecified / multicast address "
1316 "assigned as unicast address on %s",
1317 dev->name);
1318 continue;
1319 }
1320
1321 score->rule = -1;
1322 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1323
1324 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1325 int minihiscore, miniscore;
1326
1327 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1328 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1329
1330 if (minihiscore > miniscore) {
1331 if (i == IPV6_SADDR_RULE_SCOPE &&
1332 score->scopedist > 0) {
1333 /*
1334 * special case:
1335 * each remaining entry
1336 * has too small (not enough)
1337 * scope, because ifa entries
1338 * are sorted by their scope
1339 * values.
1340 */
1341 goto try_nextdev;
1342 }
1343 break;
1344 } else if (minihiscore < miniscore) {
1345 if (hiscore->ifa)
1346 in6_ifa_put(hiscore->ifa);
1347
1348 in6_ifa_hold(score->ifa);
1349
1350 swap(hiscore, score);
1351
1352 /* restore our iterator */
1353 score->ifa = hiscore->ifa;
1354
1355 break;
1356 }
1357 }
1358 }
1359 try_nextdev:
1360 read_unlock_bh(&idev->lock);
1361 }
1362 rcu_read_unlock();
1363
1364 if (!hiscore->ifa)
1365 return -EADDRNOTAVAIL;
1366
1367 *saddr = hiscore->ifa->addr;
1368 in6_ifa_put(hiscore->ifa);
1369 return 0;
1370 }
1371 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1372
1373 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1374 unsigned char banned_flags)
1375 {
1376 struct inet6_dev *idev;
1377 int err = -EADDRNOTAVAIL;
1378
1379 rcu_read_lock();
1380 idev = __in6_dev_get(dev);
1381 if (idev) {
1382 struct inet6_ifaddr *ifp;
1383
1384 read_lock_bh(&idev->lock);
1385 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1386 if (ifp->scope == IFA_LINK &&
1387 !(ifp->flags & banned_flags)) {
1388 *addr = ifp->addr;
1389 err = 0;
1390 break;
1391 }
1392 }
1393 read_unlock_bh(&idev->lock);
1394 }
1395 rcu_read_unlock();
1396 return err;
1397 }
1398
1399 static int ipv6_count_addresses(struct inet6_dev *idev)
1400 {
1401 int cnt = 0;
1402 struct inet6_ifaddr *ifp;
1403
1404 read_lock_bh(&idev->lock);
1405 list_for_each_entry(ifp, &idev->addr_list, if_list)
1406 cnt++;
1407 read_unlock_bh(&idev->lock);
1408 return cnt;
1409 }
1410
1411 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1412 struct net_device *dev, int strict)
1413 {
1414 struct inet6_ifaddr *ifp;
1415 struct hlist_node *node;
1416 unsigned int hash = inet6_addr_hash(addr);
1417
1418 rcu_read_lock_bh();
1419 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1420 if (!net_eq(dev_net(ifp->idev->dev), net))
1421 continue;
1422 if (ipv6_addr_equal(&ifp->addr, addr) &&
1423 !(ifp->flags&IFA_F_TENTATIVE) &&
1424 (dev == NULL || ifp->idev->dev == dev ||
1425 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1426 rcu_read_unlock_bh();
1427 return 1;
1428 }
1429 }
1430
1431 rcu_read_unlock_bh();
1432 return 0;
1433 }
1434 EXPORT_SYMBOL(ipv6_chk_addr);
1435
1436 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1437 struct net_device *dev)
1438 {
1439 unsigned int hash = inet6_addr_hash(addr);
1440 struct inet6_ifaddr *ifp;
1441 struct hlist_node *node;
1442
1443 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1444 if (!net_eq(dev_net(ifp->idev->dev), net))
1445 continue;
1446 if (ipv6_addr_equal(&ifp->addr, addr)) {
1447 if (dev == NULL || ifp->idev->dev == dev)
1448 return true;
1449 }
1450 }
1451 return false;
1452 }
1453
1454 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1455 {
1456 struct inet6_dev *idev;
1457 struct inet6_ifaddr *ifa;
1458 int onlink;
1459
1460 onlink = 0;
1461 rcu_read_lock();
1462 idev = __in6_dev_get(dev);
1463 if (idev) {
1464 read_lock_bh(&idev->lock);
1465 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1466 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1467 ifa->prefix_len);
1468 if (onlink)
1469 break;
1470 }
1471 read_unlock_bh(&idev->lock);
1472 }
1473 rcu_read_unlock();
1474 return onlink;
1475 }
1476 EXPORT_SYMBOL(ipv6_chk_prefix);
1477
1478 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1479 struct net_device *dev, int strict)
1480 {
1481 struct inet6_ifaddr *ifp, *result = NULL;
1482 unsigned int hash = inet6_addr_hash(addr);
1483 struct hlist_node *node;
1484
1485 rcu_read_lock_bh();
1486 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1487 if (!net_eq(dev_net(ifp->idev->dev), net))
1488 continue;
1489 if (ipv6_addr_equal(&ifp->addr, addr)) {
1490 if (dev == NULL || ifp->idev->dev == dev ||
1491 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1492 result = ifp;
1493 in6_ifa_hold(ifp);
1494 break;
1495 }
1496 }
1497 }
1498 rcu_read_unlock_bh();
1499
1500 return result;
1501 }
1502
1503 /* Gets referenced address, destroys ifaddr */
1504
1505 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1506 {
1507 if (ifp->flags&IFA_F_PERMANENT) {
1508 spin_lock_bh(&ifp->lock);
1509 addrconf_del_timer(ifp);
1510 ifp->flags |= IFA_F_TENTATIVE;
1511 if (dad_failed)
1512 ifp->flags |= IFA_F_DADFAILED;
1513 spin_unlock_bh(&ifp->lock);
1514 if (dad_failed)
1515 ipv6_ifa_notify(0, ifp);
1516 in6_ifa_put(ifp);
1517 #ifdef CONFIG_IPV6_PRIVACY
1518 } else if (ifp->flags&IFA_F_TEMPORARY) {
1519 struct inet6_ifaddr *ifpub;
1520 spin_lock_bh(&ifp->lock);
1521 ifpub = ifp->ifpub;
1522 if (ifpub) {
1523 in6_ifa_hold(ifpub);
1524 spin_unlock_bh(&ifp->lock);
1525 ipv6_create_tempaddr(ifpub, ifp);
1526 in6_ifa_put(ifpub);
1527 } else {
1528 spin_unlock_bh(&ifp->lock);
1529 }
1530 ipv6_del_addr(ifp);
1531 #endif
1532 } else
1533 ipv6_del_addr(ifp);
1534 }
1535
1536 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1537 {
1538 int err = -ENOENT;
1539
1540 spin_lock(&ifp->state_lock);
1541 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1542 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1543 err = 0;
1544 }
1545 spin_unlock(&ifp->state_lock);
1546
1547 return err;
1548 }
1549
1550 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1551 {
1552 struct inet6_dev *idev = ifp->idev;
1553
1554 if (addrconf_dad_end(ifp)) {
1555 in6_ifa_put(ifp);
1556 return;
1557 }
1558
1559 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1560 ifp->idev->dev->name, &ifp->addr);
1561
1562 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1563 struct in6_addr addr;
1564
1565 addr.s6_addr32[0] = htonl(0xfe800000);
1566 addr.s6_addr32[1] = 0;
1567
1568 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1569 ipv6_addr_equal(&ifp->addr, &addr)) {
1570 /* DAD failed for link-local based on MAC address */
1571 idev->cnf.disable_ipv6 = 1;
1572
1573 pr_info("%s: IPv6 being disabled!\n",
1574 ifp->idev->dev->name);
1575 }
1576 }
1577
1578 addrconf_dad_stop(ifp, 1);
1579 }
1580
1581 /* Join to solicited addr multicast group. */
1582
1583 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1584 {
1585 struct in6_addr maddr;
1586
1587 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1588 return;
1589
1590 addrconf_addr_solict_mult(addr, &maddr);
1591 ipv6_dev_mc_inc(dev, &maddr);
1592 }
1593
1594 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1595 {
1596 struct in6_addr maddr;
1597
1598 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1599 return;
1600
1601 addrconf_addr_solict_mult(addr, &maddr);
1602 __ipv6_dev_mc_dec(idev, &maddr);
1603 }
1604
1605 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1606 {
1607 struct in6_addr addr;
1608 if (ifp->prefix_len == 127) /* RFC 6164 */
1609 return;
1610 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1611 if (ipv6_addr_any(&addr))
1612 return;
1613 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1614 }
1615
1616 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1617 {
1618 struct in6_addr addr;
1619 if (ifp->prefix_len == 127) /* RFC 6164 */
1620 return;
1621 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1622 if (ipv6_addr_any(&addr))
1623 return;
1624 __ipv6_dev_ac_dec(ifp->idev, &addr);
1625 }
1626
1627 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1628 {
1629 if (dev->addr_len != ETH_ALEN)
1630 return -1;
1631 memcpy(eui, dev->dev_addr, 3);
1632 memcpy(eui + 5, dev->dev_addr + 3, 3);
1633
1634 /*
1635 * The zSeries OSA network cards can be shared among various
1636 * OS instances, but the OSA cards have only one MAC address.
1637 * This leads to duplicate address conflicts in conjunction
1638 * with IPv6 if more than one instance uses the same card.
1639 *
1640 * The driver for these cards can deliver a unique 16-bit
1641 * identifier for each instance sharing the same card. It is
1642 * placed instead of 0xFFFE in the interface identifier. The
1643 * "u" bit of the interface identifier is not inverted in this
1644 * case. Hence the resulting interface identifier has local
1645 * scope according to RFC2373.
1646 */
1647 if (dev->dev_id) {
1648 eui[3] = (dev->dev_id >> 8) & 0xFF;
1649 eui[4] = dev->dev_id & 0xFF;
1650 } else {
1651 eui[3] = 0xFF;
1652 eui[4] = 0xFE;
1653 eui[0] ^= 2;
1654 }
1655 return 0;
1656 }
1657
1658 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1659 {
1660 if (dev->addr_len != IEEE802154_ADDR_LEN)
1661 return -1;
1662 memcpy(eui, dev->dev_addr, 8);
1663 return 0;
1664 }
1665
1666 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1667 {
1668 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1669 if (dev->addr_len != ARCNET_ALEN)
1670 return -1;
1671 memset(eui, 0, 7);
1672 eui[7] = *(u8 *)dev->dev_addr;
1673 return 0;
1674 }
1675
1676 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1677 {
1678 if (dev->addr_len != INFINIBAND_ALEN)
1679 return -1;
1680 memcpy(eui, dev->dev_addr + 12, 8);
1681 eui[0] |= 2;
1682 return 0;
1683 }
1684
1685 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1686 {
1687 if (addr == 0)
1688 return -1;
1689 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1690 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1691 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1692 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1693 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1694 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1695 eui[1] = 0;
1696 eui[2] = 0x5E;
1697 eui[3] = 0xFE;
1698 memcpy(eui + 4, &addr, 4);
1699 return 0;
1700 }
1701
1702 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1703 {
1704 if (dev->priv_flags & IFF_ISATAP)
1705 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1706 return -1;
1707 }
1708
1709 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1710 {
1711 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1712 }
1713
1714 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1715 {
1716 switch (dev->type) {
1717 case ARPHRD_ETHER:
1718 case ARPHRD_FDDI:
1719 return addrconf_ifid_eui48(eui, dev);
1720 case ARPHRD_ARCNET:
1721 return addrconf_ifid_arcnet(eui, dev);
1722 case ARPHRD_INFINIBAND:
1723 return addrconf_ifid_infiniband(eui, dev);
1724 case ARPHRD_SIT:
1725 return addrconf_ifid_sit(eui, dev);
1726 case ARPHRD_IPGRE:
1727 return addrconf_ifid_gre(eui, dev);
1728 case ARPHRD_IEEE802154:
1729 return addrconf_ifid_eui64(eui, dev);
1730 }
1731 return -1;
1732 }
1733
1734 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1735 {
1736 int err = -1;
1737 struct inet6_ifaddr *ifp;
1738
1739 read_lock_bh(&idev->lock);
1740 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1741 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1742 memcpy(eui, ifp->addr.s6_addr+8, 8);
1743 err = 0;
1744 break;
1745 }
1746 }
1747 read_unlock_bh(&idev->lock);
1748 return err;
1749 }
1750
1751 #ifdef CONFIG_IPV6_PRIVACY
1752 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1753 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1754 {
1755 regen:
1756 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1757 idev->rndid[0] &= ~0x02;
1758
1759 /*
1760 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1761 * check if generated address is not inappropriate
1762 *
1763 * - Reserved subnet anycast (RFC 2526)
1764 * 11111101 11....11 1xxxxxxx
1765 * - ISATAP (RFC4214) 6.1
1766 * 00-00-5E-FE-xx-xx-xx-xx
1767 * - value 0
1768 * - XXX: already assigned to an address on the device
1769 */
1770 if (idev->rndid[0] == 0xfd &&
1771 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1772 (idev->rndid[7]&0x80))
1773 goto regen;
1774 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1775 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1776 goto regen;
1777 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1778 goto regen;
1779 }
1780 }
1781
1782 static void ipv6_regen_rndid(unsigned long data)
1783 {
1784 struct inet6_dev *idev = (struct inet6_dev *) data;
1785 unsigned long expires;
1786
1787 rcu_read_lock_bh();
1788 write_lock_bh(&idev->lock);
1789
1790 if (idev->dead)
1791 goto out;
1792
1793 __ipv6_regen_rndid(idev);
1794
1795 expires = jiffies +
1796 idev->cnf.temp_prefered_lft * HZ -
1797 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1798 idev->cnf.max_desync_factor * HZ;
1799 if (time_before(expires, jiffies)) {
1800 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1801 __func__, idev->dev->name);
1802 goto out;
1803 }
1804
1805 if (!mod_timer(&idev->regen_timer, expires))
1806 in6_dev_hold(idev);
1807
1808 out:
1809 write_unlock_bh(&idev->lock);
1810 rcu_read_unlock_bh();
1811 in6_dev_put(idev);
1812 }
1813
1814 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1815 {
1816 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1817 __ipv6_regen_rndid(idev);
1818 }
1819 #endif
1820
1821 /*
1822 * Add prefix route.
1823 */
1824
1825 static void
1826 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1827 unsigned long expires, u32 flags)
1828 {
1829 struct fib6_config cfg = {
1830 .fc_table = RT6_TABLE_PREFIX,
1831 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1832 .fc_ifindex = dev->ifindex,
1833 .fc_expires = expires,
1834 .fc_dst_len = plen,
1835 .fc_flags = RTF_UP | flags,
1836 .fc_nlinfo.nl_net = dev_net(dev),
1837 .fc_protocol = RTPROT_KERNEL,
1838 };
1839
1840 cfg.fc_dst = *pfx;
1841
1842 /* Prevent useless cloning on PtP SIT.
1843 This thing is done here expecting that the whole
1844 class of non-broadcast devices need not cloning.
1845 */
1846 #if IS_ENABLED(CONFIG_IPV6_SIT)
1847 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1848 cfg.fc_flags |= RTF_NONEXTHOP;
1849 #endif
1850
1851 ip6_route_add(&cfg);
1852 }
1853
1854
1855 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1856 int plen,
1857 const struct net_device *dev,
1858 u32 flags, u32 noflags)
1859 {
1860 struct fib6_node *fn;
1861 struct rt6_info *rt = NULL;
1862 struct fib6_table *table;
1863
1864 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1865 if (table == NULL)
1866 return NULL;
1867
1868 read_lock_bh(&table->tb6_lock);
1869 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1870 if (!fn)
1871 goto out;
1872 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1873 if (rt->dst.dev->ifindex != dev->ifindex)
1874 continue;
1875 if ((rt->rt6i_flags & flags) != flags)
1876 continue;
1877 if ((rt->rt6i_flags & noflags) != 0)
1878 continue;
1879 dst_hold(&rt->dst);
1880 break;
1881 }
1882 out:
1883 read_unlock_bh(&table->tb6_lock);
1884 return rt;
1885 }
1886
1887
1888 /* Create "default" multicast route to the interface */
1889
1890 static void addrconf_add_mroute(struct net_device *dev)
1891 {
1892 struct fib6_config cfg = {
1893 .fc_table = RT6_TABLE_LOCAL,
1894 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1895 .fc_ifindex = dev->ifindex,
1896 .fc_dst_len = 8,
1897 .fc_flags = RTF_UP,
1898 .fc_nlinfo.nl_net = dev_net(dev),
1899 };
1900
1901 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1902
1903 ip6_route_add(&cfg);
1904 }
1905
1906 #if IS_ENABLED(CONFIG_IPV6_SIT)
1907 static void sit_route_add(struct net_device *dev)
1908 {
1909 struct fib6_config cfg = {
1910 .fc_table = RT6_TABLE_MAIN,
1911 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1912 .fc_ifindex = dev->ifindex,
1913 .fc_dst_len = 96,
1914 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1915 .fc_nlinfo.nl_net = dev_net(dev),
1916 };
1917
1918 /* prefix length - 96 bits "::d.d.d.d" */
1919 ip6_route_add(&cfg);
1920 }
1921 #endif
1922
1923 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1924 {
1925 struct inet6_dev *idev;
1926
1927 ASSERT_RTNL();
1928
1929 idev = ipv6_find_idev(dev);
1930 if (!idev)
1931 return ERR_PTR(-ENOBUFS);
1932
1933 if (idev->cnf.disable_ipv6)
1934 return ERR_PTR(-EACCES);
1935
1936 /* Add default multicast route */
1937 if (!(dev->flags & IFF_LOOPBACK))
1938 addrconf_add_mroute(dev);
1939
1940 return idev;
1941 }
1942
1943 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1944 {
1945 struct prefix_info *pinfo;
1946 __u32 valid_lft;
1947 __u32 prefered_lft;
1948 int addr_type;
1949 struct inet6_dev *in6_dev;
1950 struct net *net = dev_net(dev);
1951
1952 pinfo = (struct prefix_info *) opt;
1953
1954 if (len < sizeof(struct prefix_info)) {
1955 ADBG(("addrconf: prefix option too short\n"));
1956 return;
1957 }
1958
1959 /*
1960 * Validation checks ([ADDRCONF], page 19)
1961 */
1962
1963 addr_type = ipv6_addr_type(&pinfo->prefix);
1964
1965 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1966 return;
1967
1968 valid_lft = ntohl(pinfo->valid);
1969 prefered_lft = ntohl(pinfo->prefered);
1970
1971 if (prefered_lft > valid_lft) {
1972 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1973 return;
1974 }
1975
1976 in6_dev = in6_dev_get(dev);
1977
1978 if (in6_dev == NULL) {
1979 net_dbg_ratelimited("addrconf: device %s not configured\n",
1980 dev->name);
1981 return;
1982 }
1983
1984 /*
1985 * Two things going on here:
1986 * 1) Add routes for on-link prefixes
1987 * 2) Configure prefixes with the auto flag set
1988 */
1989
1990 if (pinfo->onlink) {
1991 struct rt6_info *rt;
1992 unsigned long rt_expires;
1993
1994 /* Avoid arithmetic overflow. Really, we could
1995 * save rt_expires in seconds, likely valid_lft,
1996 * but it would require division in fib gc, that it
1997 * not good.
1998 */
1999 if (HZ > USER_HZ)
2000 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2001 else
2002 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2003
2004 if (addrconf_finite_timeout(rt_expires))
2005 rt_expires *= HZ;
2006
2007 rt = addrconf_get_prefix_route(&pinfo->prefix,
2008 pinfo->prefix_len,
2009 dev,
2010 RTF_ADDRCONF | RTF_PREFIX_RT,
2011 RTF_GATEWAY | RTF_DEFAULT);
2012
2013 if (rt) {
2014 /* Autoconf prefix route */
2015 if (valid_lft == 0) {
2016 ip6_del_rt(rt);
2017 rt = NULL;
2018 } else if (addrconf_finite_timeout(rt_expires)) {
2019 /* not infinity */
2020 rt6_set_expires(rt, jiffies + rt_expires);
2021 } else {
2022 rt6_clean_expires(rt);
2023 }
2024 } else if (valid_lft) {
2025 clock_t expires = 0;
2026 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2027 if (addrconf_finite_timeout(rt_expires)) {
2028 /* not infinity */
2029 flags |= RTF_EXPIRES;
2030 expires = jiffies_to_clock_t(rt_expires);
2031 }
2032 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2033 dev, expires, flags);
2034 }
2035 ip6_rt_put(rt);
2036 }
2037
2038 /* Try to figure out our local address for this prefix */
2039
2040 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2041 struct inet6_ifaddr *ifp;
2042 struct in6_addr addr;
2043 int create = 0, update_lft = 0;
2044
2045 if (pinfo->prefix_len == 64) {
2046 memcpy(&addr, &pinfo->prefix, 8);
2047 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2048 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2049 in6_dev_put(in6_dev);
2050 return;
2051 }
2052 goto ok;
2053 }
2054 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2055 pinfo->prefix_len);
2056 in6_dev_put(in6_dev);
2057 return;
2058
2059 ok:
2060
2061 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2062
2063 if (ifp == NULL && valid_lft) {
2064 int max_addresses = in6_dev->cnf.max_addresses;
2065 u32 addr_flags = 0;
2066
2067 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2068 if (in6_dev->cnf.optimistic_dad &&
2069 !net->ipv6.devconf_all->forwarding && sllao)
2070 addr_flags = IFA_F_OPTIMISTIC;
2071 #endif
2072
2073 /* Do not allow to create too much of autoconfigured
2074 * addresses; this would be too easy way to crash kernel.
2075 */
2076 if (!max_addresses ||
2077 ipv6_count_addresses(in6_dev) < max_addresses)
2078 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
2079 addr_type&IPV6_ADDR_SCOPE_MASK,
2080 addr_flags);
2081
2082 if (!ifp || IS_ERR(ifp)) {
2083 in6_dev_put(in6_dev);
2084 return;
2085 }
2086
2087 update_lft = create = 1;
2088 ifp->cstamp = jiffies;
2089 addrconf_dad_start(ifp);
2090 }
2091
2092 if (ifp) {
2093 int flags;
2094 unsigned long now;
2095 #ifdef CONFIG_IPV6_PRIVACY
2096 struct inet6_ifaddr *ift;
2097 #endif
2098 u32 stored_lft;
2099
2100 /* update lifetime (RFC2462 5.5.3 e) */
2101 spin_lock(&ifp->lock);
2102 now = jiffies;
2103 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2104 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2105 else
2106 stored_lft = 0;
2107 if (!update_lft && stored_lft) {
2108 if (valid_lft > MIN_VALID_LIFETIME ||
2109 valid_lft > stored_lft)
2110 update_lft = 1;
2111 else if (stored_lft <= MIN_VALID_LIFETIME) {
2112 /* valid_lft <= stored_lft is always true */
2113 /*
2114 * RFC 4862 Section 5.5.3e:
2115 * "Note that the preferred lifetime of
2116 * the corresponding address is always
2117 * reset to the Preferred Lifetime in
2118 * the received Prefix Information
2119 * option, regardless of whether the
2120 * valid lifetime is also reset or
2121 * ignored."
2122 *
2123 * So if the preferred lifetime in
2124 * this advertisement is different
2125 * than what we have stored, but the
2126 * valid lifetime is invalid, just
2127 * reset prefered_lft.
2128 *
2129 * We must set the valid lifetime
2130 * to the stored lifetime since we'll
2131 * be updating the timestamp below,
2132 * else we'll set it back to the
2133 * minimum.
2134 */
2135 if (prefered_lft != ifp->prefered_lft) {
2136 valid_lft = stored_lft;
2137 update_lft = 1;
2138 }
2139 } else {
2140 valid_lft = MIN_VALID_LIFETIME;
2141 if (valid_lft < prefered_lft)
2142 prefered_lft = valid_lft;
2143 update_lft = 1;
2144 }
2145 }
2146
2147 if (update_lft) {
2148 ifp->valid_lft = valid_lft;
2149 ifp->prefered_lft = prefered_lft;
2150 ifp->tstamp = now;
2151 flags = ifp->flags;
2152 ifp->flags &= ~IFA_F_DEPRECATED;
2153 spin_unlock(&ifp->lock);
2154
2155 if (!(flags&IFA_F_TENTATIVE))
2156 ipv6_ifa_notify(0, ifp);
2157 } else
2158 spin_unlock(&ifp->lock);
2159
2160 #ifdef CONFIG_IPV6_PRIVACY
2161 read_lock_bh(&in6_dev->lock);
2162 /* update all temporary addresses in the list */
2163 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2164 tmp_list) {
2165 int age, max_valid, max_prefered;
2166
2167 if (ifp != ift->ifpub)
2168 continue;
2169
2170 /*
2171 * RFC 4941 section 3.3:
2172 * If a received option will extend the lifetime
2173 * of a public address, the lifetimes of
2174 * temporary addresses should be extended,
2175 * subject to the overall constraint that no
2176 * temporary addresses should ever remain
2177 * "valid" or "preferred" for a time longer than
2178 * (TEMP_VALID_LIFETIME) or
2179 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2180 * respectively.
2181 */
2182 age = (now - ift->cstamp) / HZ;
2183 max_valid = in6_dev->cnf.temp_valid_lft - age;
2184 if (max_valid < 0)
2185 max_valid = 0;
2186
2187 max_prefered = in6_dev->cnf.temp_prefered_lft -
2188 in6_dev->cnf.max_desync_factor -
2189 age;
2190 if (max_prefered < 0)
2191 max_prefered = 0;
2192
2193 if (valid_lft > max_valid)
2194 valid_lft = max_valid;
2195
2196 if (prefered_lft > max_prefered)
2197 prefered_lft = max_prefered;
2198
2199 spin_lock(&ift->lock);
2200 flags = ift->flags;
2201 ift->valid_lft = valid_lft;
2202 ift->prefered_lft = prefered_lft;
2203 ift->tstamp = now;
2204 if (prefered_lft > 0)
2205 ift->flags &= ~IFA_F_DEPRECATED;
2206
2207 spin_unlock(&ift->lock);
2208 if (!(flags&IFA_F_TENTATIVE))
2209 ipv6_ifa_notify(0, ift);
2210 }
2211
2212 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2213 /*
2214 * When a new public address is created as
2215 * described in [ADDRCONF], also create a new
2216 * temporary address. Also create a temporary
2217 * address if it's enabled but no temporary
2218 * address currently exists.
2219 */
2220 read_unlock_bh(&in6_dev->lock);
2221 ipv6_create_tempaddr(ifp, NULL);
2222 } else {
2223 read_unlock_bh(&in6_dev->lock);
2224 }
2225 #endif
2226 in6_ifa_put(ifp);
2227 addrconf_verify(0);
2228 }
2229 }
2230 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2231 in6_dev_put(in6_dev);
2232 }
2233
2234 /*
2235 * Set destination address.
2236 * Special case for SIT interfaces where we create a new "virtual"
2237 * device.
2238 */
2239 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2240 {
2241 struct in6_ifreq ireq;
2242 struct net_device *dev;
2243 int err = -EINVAL;
2244
2245 rtnl_lock();
2246
2247 err = -EFAULT;
2248 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2249 goto err_exit;
2250
2251 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2252
2253 err = -ENODEV;
2254 if (dev == NULL)
2255 goto err_exit;
2256
2257 #if IS_ENABLED(CONFIG_IPV6_SIT)
2258 if (dev->type == ARPHRD_SIT) {
2259 const struct net_device_ops *ops = dev->netdev_ops;
2260 struct ifreq ifr;
2261 struct ip_tunnel_parm p;
2262
2263 err = -EADDRNOTAVAIL;
2264 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2265 goto err_exit;
2266
2267 memset(&p, 0, sizeof(p));
2268 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2269 p.iph.saddr = 0;
2270 p.iph.version = 4;
2271 p.iph.ihl = 5;
2272 p.iph.protocol = IPPROTO_IPV6;
2273 p.iph.ttl = 64;
2274 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2275
2276 if (ops->ndo_do_ioctl) {
2277 mm_segment_t oldfs = get_fs();
2278
2279 set_fs(KERNEL_DS);
2280 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2281 set_fs(oldfs);
2282 } else
2283 err = -EOPNOTSUPP;
2284
2285 if (err == 0) {
2286 err = -ENOBUFS;
2287 dev = __dev_get_by_name(net, p.name);
2288 if (!dev)
2289 goto err_exit;
2290 err = dev_open(dev);
2291 }
2292 }
2293 #endif
2294
2295 err_exit:
2296 rtnl_unlock();
2297 return err;
2298 }
2299
2300 /*
2301 * Manual configuration of address on an interface
2302 */
2303 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2304 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2305 __u32 valid_lft)
2306 {
2307 struct inet6_ifaddr *ifp;
2308 struct inet6_dev *idev;
2309 struct net_device *dev;
2310 int scope;
2311 u32 flags;
2312 clock_t expires;
2313 unsigned long timeout;
2314
2315 ASSERT_RTNL();
2316
2317 if (plen > 128)
2318 return -EINVAL;
2319
2320 /* check the lifetime */
2321 if (!valid_lft || prefered_lft > valid_lft)
2322 return -EINVAL;
2323
2324 dev = __dev_get_by_index(net, ifindex);
2325 if (!dev)
2326 return -ENODEV;
2327
2328 idev = addrconf_add_dev(dev);
2329 if (IS_ERR(idev))
2330 return PTR_ERR(idev);
2331
2332 scope = ipv6_addr_scope(pfx);
2333
2334 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2335 if (addrconf_finite_timeout(timeout)) {
2336 expires = jiffies_to_clock_t(timeout * HZ);
2337 valid_lft = timeout;
2338 flags = RTF_EXPIRES;
2339 } else {
2340 expires = 0;
2341 flags = 0;
2342 ifa_flags |= IFA_F_PERMANENT;
2343 }
2344
2345 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2346 if (addrconf_finite_timeout(timeout)) {
2347 if (timeout == 0)
2348 ifa_flags |= IFA_F_DEPRECATED;
2349 prefered_lft = timeout;
2350 }
2351
2352 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2353
2354 if (!IS_ERR(ifp)) {
2355 spin_lock_bh(&ifp->lock);
2356 ifp->valid_lft = valid_lft;
2357 ifp->prefered_lft = prefered_lft;
2358 ifp->tstamp = jiffies;
2359 spin_unlock_bh(&ifp->lock);
2360
2361 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2362 expires, flags);
2363 /*
2364 * Note that section 3.1 of RFC 4429 indicates
2365 * that the Optimistic flag should not be set for
2366 * manually configured addresses
2367 */
2368 addrconf_dad_start(ifp);
2369 in6_ifa_put(ifp);
2370 addrconf_verify(0);
2371 return 0;
2372 }
2373
2374 return PTR_ERR(ifp);
2375 }
2376
2377 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2378 unsigned int plen)
2379 {
2380 struct inet6_ifaddr *ifp;
2381 struct inet6_dev *idev;
2382 struct net_device *dev;
2383
2384 if (plen > 128)
2385 return -EINVAL;
2386
2387 dev = __dev_get_by_index(net, ifindex);
2388 if (!dev)
2389 return -ENODEV;
2390
2391 if ((idev = __in6_dev_get(dev)) == NULL)
2392 return -ENXIO;
2393
2394 read_lock_bh(&idev->lock);
2395 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2396 if (ifp->prefix_len == plen &&
2397 ipv6_addr_equal(pfx, &ifp->addr)) {
2398 in6_ifa_hold(ifp);
2399 read_unlock_bh(&idev->lock);
2400
2401 ipv6_del_addr(ifp);
2402
2403 /* If the last address is deleted administratively,
2404 disable IPv6 on this interface.
2405 */
2406 if (list_empty(&idev->addr_list))
2407 addrconf_ifdown(idev->dev, 1);
2408 return 0;
2409 }
2410 }
2411 read_unlock_bh(&idev->lock);
2412 return -EADDRNOTAVAIL;
2413 }
2414
2415
2416 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2417 {
2418 struct in6_ifreq ireq;
2419 int err;
2420
2421 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2422 return -EPERM;
2423
2424 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2425 return -EFAULT;
2426
2427 rtnl_lock();
2428 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2429 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2430 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2431 rtnl_unlock();
2432 return err;
2433 }
2434
2435 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2436 {
2437 struct in6_ifreq ireq;
2438 int err;
2439
2440 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2441 return -EPERM;
2442
2443 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2444 return -EFAULT;
2445
2446 rtnl_lock();
2447 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2448 ireq.ifr6_prefixlen);
2449 rtnl_unlock();
2450 return err;
2451 }
2452
2453 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2454 int plen, int scope)
2455 {
2456 struct inet6_ifaddr *ifp;
2457
2458 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2459 if (!IS_ERR(ifp)) {
2460 spin_lock_bh(&ifp->lock);
2461 ifp->flags &= ~IFA_F_TENTATIVE;
2462 spin_unlock_bh(&ifp->lock);
2463 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2464 in6_ifa_put(ifp);
2465 }
2466 }
2467
2468 #if IS_ENABLED(CONFIG_IPV6_SIT)
2469 static void sit_add_v4_addrs(struct inet6_dev *idev)
2470 {
2471 struct in6_addr addr;
2472 struct net_device *dev;
2473 struct net *net = dev_net(idev->dev);
2474 int scope;
2475
2476 ASSERT_RTNL();
2477
2478 memset(&addr, 0, sizeof(struct in6_addr));
2479 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2480
2481 if (idev->dev->flags&IFF_POINTOPOINT) {
2482 addr.s6_addr32[0] = htonl(0xfe800000);
2483 scope = IFA_LINK;
2484 } else {
2485 scope = IPV6_ADDR_COMPATv4;
2486 }
2487
2488 if (addr.s6_addr32[3]) {
2489 add_addr(idev, &addr, 128, scope);
2490 return;
2491 }
2492
2493 for_each_netdev(net, dev) {
2494 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2495 if (in_dev && (dev->flags & IFF_UP)) {
2496 struct in_ifaddr *ifa;
2497
2498 int flag = scope;
2499
2500 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2501 int plen;
2502
2503 addr.s6_addr32[3] = ifa->ifa_local;
2504
2505 if (ifa->ifa_scope == RT_SCOPE_LINK)
2506 continue;
2507 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2508 if (idev->dev->flags&IFF_POINTOPOINT)
2509 continue;
2510 flag |= IFA_HOST;
2511 }
2512 if (idev->dev->flags&IFF_POINTOPOINT)
2513 plen = 64;
2514 else
2515 plen = 96;
2516
2517 add_addr(idev, &addr, plen, flag);
2518 }
2519 }
2520 }
2521 }
2522 #endif
2523
2524 static void init_loopback(struct net_device *dev)
2525 {
2526 struct inet6_dev *idev;
2527
2528 /* ::1 */
2529
2530 ASSERT_RTNL();
2531
2532 if ((idev = ipv6_find_idev(dev)) == NULL) {
2533 pr_debug("%s: add_dev failed\n", __func__);
2534 return;
2535 }
2536
2537 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2538 }
2539
2540 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2541 {
2542 struct inet6_ifaddr *ifp;
2543 u32 addr_flags = IFA_F_PERMANENT;
2544
2545 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2546 if (idev->cnf.optimistic_dad &&
2547 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2548 addr_flags |= IFA_F_OPTIMISTIC;
2549 #endif
2550
2551
2552 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2553 if (!IS_ERR(ifp)) {
2554 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2555 addrconf_dad_start(ifp);
2556 in6_ifa_put(ifp);
2557 }
2558 }
2559
2560 static void addrconf_dev_config(struct net_device *dev)
2561 {
2562 struct in6_addr addr;
2563 struct inet6_dev *idev;
2564
2565 ASSERT_RTNL();
2566
2567 if ((dev->type != ARPHRD_ETHER) &&
2568 (dev->type != ARPHRD_FDDI) &&
2569 (dev->type != ARPHRD_ARCNET) &&
2570 (dev->type != ARPHRD_INFINIBAND) &&
2571 (dev->type != ARPHRD_IEEE802154)) {
2572 /* Alas, we support only Ethernet autoconfiguration. */
2573 return;
2574 }
2575
2576 idev = addrconf_add_dev(dev);
2577 if (IS_ERR(idev))
2578 return;
2579
2580 memset(&addr, 0, sizeof(struct in6_addr));
2581 addr.s6_addr32[0] = htonl(0xFE800000);
2582
2583 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2584 addrconf_add_linklocal(idev, &addr);
2585 }
2586
2587 #if IS_ENABLED(CONFIG_IPV6_SIT)
2588 static void addrconf_sit_config(struct net_device *dev)
2589 {
2590 struct inet6_dev *idev;
2591
2592 ASSERT_RTNL();
2593
2594 /*
2595 * Configure the tunnel with one of our IPv4
2596 * addresses... we should configure all of
2597 * our v4 addrs in the tunnel
2598 */
2599
2600 if ((idev = ipv6_find_idev(dev)) == NULL) {
2601 pr_debug("%s: add_dev failed\n", __func__);
2602 return;
2603 }
2604
2605 if (dev->priv_flags & IFF_ISATAP) {
2606 struct in6_addr addr;
2607
2608 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2609 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2610 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2611 addrconf_add_linklocal(idev, &addr);
2612 return;
2613 }
2614
2615 sit_add_v4_addrs(idev);
2616
2617 if (dev->flags&IFF_POINTOPOINT)
2618 addrconf_add_mroute(dev);
2619 else
2620 sit_route_add(dev);
2621 }
2622 #endif
2623
2624 #if IS_ENABLED(CONFIG_NET_IPGRE)
2625 static void addrconf_gre_config(struct net_device *dev)
2626 {
2627 struct inet6_dev *idev;
2628 struct in6_addr addr;
2629
2630 pr_info("%s(%s)\n", __func__, dev->name);
2631
2632 ASSERT_RTNL();
2633
2634 if ((idev = ipv6_find_idev(dev)) == NULL) {
2635 pr_debug("%s: add_dev failed\n", __func__);
2636 return;
2637 }
2638
2639 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2640 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2641
2642 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2643 addrconf_add_linklocal(idev, &addr);
2644 }
2645 #endif
2646
2647 static inline int
2648 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2649 {
2650 struct in6_addr lladdr;
2651
2652 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2653 addrconf_add_linklocal(idev, &lladdr);
2654 return 0;
2655 }
2656 return -1;
2657 }
2658
2659 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2660 {
2661 struct net_device *link_dev;
2662 struct net *net = dev_net(idev->dev);
2663
2664 /* first try to inherit the link-local address from the link device */
2665 if (idev->dev->iflink &&
2666 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2667 if (!ipv6_inherit_linklocal(idev, link_dev))
2668 return;
2669 }
2670 /* then try to inherit it from any device */
2671 for_each_netdev(net, link_dev) {
2672 if (!ipv6_inherit_linklocal(idev, link_dev))
2673 return;
2674 }
2675 pr_debug("init ip6-ip6: add_linklocal failed\n");
2676 }
2677
2678 /*
2679 * Autoconfigure tunnel with a link-local address so routing protocols,
2680 * DHCPv6, MLD etc. can be run over the virtual link
2681 */
2682
2683 static void addrconf_ip6_tnl_config(struct net_device *dev)
2684 {
2685 struct inet6_dev *idev;
2686
2687 ASSERT_RTNL();
2688
2689 idev = addrconf_add_dev(dev);
2690 if (IS_ERR(idev)) {
2691 pr_debug("init ip6-ip6: add_dev failed\n");
2692 return;
2693 }
2694 ip6_tnl_add_linklocal(idev);
2695 }
2696
2697 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2698 void *data)
2699 {
2700 struct net_device *dev = (struct net_device *) data;
2701 struct inet6_dev *idev = __in6_dev_get(dev);
2702 int run_pending = 0;
2703 int err;
2704
2705 switch (event) {
2706 case NETDEV_REGISTER:
2707 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2708 idev = ipv6_add_dev(dev);
2709 if (!idev)
2710 return notifier_from_errno(-ENOMEM);
2711 }
2712 break;
2713
2714 case NETDEV_UP:
2715 case NETDEV_CHANGE:
2716 if (dev->flags & IFF_SLAVE)
2717 break;
2718
2719 if (event == NETDEV_UP) {
2720 if (!addrconf_qdisc_ok(dev)) {
2721 /* device is not ready yet. */
2722 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2723 dev->name);
2724 break;
2725 }
2726
2727 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2728 idev = ipv6_add_dev(dev);
2729
2730 if (idev) {
2731 idev->if_flags |= IF_READY;
2732 run_pending = 1;
2733 }
2734 } else {
2735 if (!addrconf_qdisc_ok(dev)) {
2736 /* device is still not ready. */
2737 break;
2738 }
2739
2740 if (idev) {
2741 if (idev->if_flags & IF_READY)
2742 /* device is already configured. */
2743 break;
2744 idev->if_flags |= IF_READY;
2745 }
2746
2747 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2748 dev->name);
2749
2750 run_pending = 1;
2751 }
2752
2753 switch (dev->type) {
2754 #if IS_ENABLED(CONFIG_IPV6_SIT)
2755 case ARPHRD_SIT:
2756 addrconf_sit_config(dev);
2757 break;
2758 #endif
2759 #if IS_ENABLED(CONFIG_NET_IPGRE)
2760 case ARPHRD_IPGRE:
2761 addrconf_gre_config(dev);
2762 break;
2763 #endif
2764 case ARPHRD_TUNNEL6:
2765 addrconf_ip6_tnl_config(dev);
2766 break;
2767 case ARPHRD_LOOPBACK:
2768 init_loopback(dev);
2769 break;
2770
2771 default:
2772 addrconf_dev_config(dev);
2773 break;
2774 }
2775
2776 if (idev) {
2777 if (run_pending)
2778 addrconf_dad_run(idev);
2779
2780 /*
2781 * If the MTU changed during the interface down,
2782 * when the interface up, the changed MTU must be
2783 * reflected in the idev as well as routers.
2784 */
2785 if (idev->cnf.mtu6 != dev->mtu &&
2786 dev->mtu >= IPV6_MIN_MTU) {
2787 rt6_mtu_change(dev, dev->mtu);
2788 idev->cnf.mtu6 = dev->mtu;
2789 }
2790 idev->tstamp = jiffies;
2791 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2792
2793 /*
2794 * If the changed mtu during down is lower than
2795 * IPV6_MIN_MTU stop IPv6 on this interface.
2796 */
2797 if (dev->mtu < IPV6_MIN_MTU)
2798 addrconf_ifdown(dev, 1);
2799 }
2800 break;
2801
2802 case NETDEV_CHANGEMTU:
2803 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2804 rt6_mtu_change(dev, dev->mtu);
2805 idev->cnf.mtu6 = dev->mtu;
2806 break;
2807 }
2808
2809 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2810 idev = ipv6_add_dev(dev);
2811 if (idev)
2812 break;
2813 }
2814
2815 /*
2816 * MTU falled under IPV6_MIN_MTU.
2817 * Stop IPv6 on this interface.
2818 */
2819
2820 case NETDEV_DOWN:
2821 case NETDEV_UNREGISTER:
2822 /*
2823 * Remove all addresses from this interface.
2824 */
2825 addrconf_ifdown(dev, event != NETDEV_DOWN);
2826 break;
2827
2828 case NETDEV_CHANGENAME:
2829 if (idev) {
2830 snmp6_unregister_dev(idev);
2831 addrconf_sysctl_unregister(idev);
2832 addrconf_sysctl_register(idev);
2833 err = snmp6_register_dev(idev);
2834 if (err)
2835 return notifier_from_errno(err);
2836 }
2837 break;
2838
2839 case NETDEV_PRE_TYPE_CHANGE:
2840 case NETDEV_POST_TYPE_CHANGE:
2841 addrconf_type_change(dev, event);
2842 break;
2843 }
2844
2845 return NOTIFY_OK;
2846 }
2847
2848 /*
2849 * addrconf module should be notified of a device going up
2850 */
2851 static struct notifier_block ipv6_dev_notf = {
2852 .notifier_call = addrconf_notify,
2853 };
2854
2855 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2856 {
2857 struct inet6_dev *idev;
2858 ASSERT_RTNL();
2859
2860 idev = __in6_dev_get(dev);
2861
2862 if (event == NETDEV_POST_TYPE_CHANGE)
2863 ipv6_mc_remap(idev);
2864 else if (event == NETDEV_PRE_TYPE_CHANGE)
2865 ipv6_mc_unmap(idev);
2866 }
2867
2868 static int addrconf_ifdown(struct net_device *dev, int how)
2869 {
2870 struct net *net = dev_net(dev);
2871 struct inet6_dev *idev;
2872 struct inet6_ifaddr *ifa;
2873 int state, i;
2874
2875 ASSERT_RTNL();
2876
2877 rt6_ifdown(net, dev);
2878 neigh_ifdown(&nd_tbl, dev);
2879
2880 idev = __in6_dev_get(dev);
2881 if (idev == NULL)
2882 return -ENODEV;
2883
2884 /*
2885 * Step 1: remove reference to ipv6 device from parent device.
2886 * Do not dev_put!
2887 */
2888 if (how) {
2889 idev->dead = 1;
2890
2891 /* protected by rtnl_lock */
2892 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2893
2894 /* Step 1.5: remove snmp6 entry */
2895 snmp6_unregister_dev(idev);
2896
2897 }
2898
2899 /* Step 2: clear hash table */
2900 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2901 struct hlist_head *h = &inet6_addr_lst[i];
2902 struct hlist_node *n;
2903
2904 spin_lock_bh(&addrconf_hash_lock);
2905 restart:
2906 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2907 if (ifa->idev == idev) {
2908 hlist_del_init_rcu(&ifa->addr_lst);
2909 addrconf_del_timer(ifa);
2910 goto restart;
2911 }
2912 }
2913 spin_unlock_bh(&addrconf_hash_lock);
2914 }
2915
2916 write_lock_bh(&idev->lock);
2917
2918 /* Step 2: clear flags for stateless addrconf */
2919 if (!how)
2920 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2921
2922 #ifdef CONFIG_IPV6_PRIVACY
2923 if (how && del_timer(&idev->regen_timer))
2924 in6_dev_put(idev);
2925
2926 /* Step 3: clear tempaddr list */
2927 while (!list_empty(&idev->tempaddr_list)) {
2928 ifa = list_first_entry(&idev->tempaddr_list,
2929 struct inet6_ifaddr, tmp_list);
2930 list_del(&ifa->tmp_list);
2931 write_unlock_bh(&idev->lock);
2932 spin_lock_bh(&ifa->lock);
2933
2934 if (ifa->ifpub) {
2935 in6_ifa_put(ifa->ifpub);
2936 ifa->ifpub = NULL;
2937 }
2938 spin_unlock_bh(&ifa->lock);
2939 in6_ifa_put(ifa);
2940 write_lock_bh(&idev->lock);
2941 }
2942 #endif
2943
2944 while (!list_empty(&idev->addr_list)) {
2945 ifa = list_first_entry(&idev->addr_list,
2946 struct inet6_ifaddr, if_list);
2947 addrconf_del_timer(ifa);
2948
2949 list_del(&ifa->if_list);
2950
2951 write_unlock_bh(&idev->lock);
2952
2953 spin_lock_bh(&ifa->state_lock);
2954 state = ifa->state;
2955 ifa->state = INET6_IFADDR_STATE_DEAD;
2956 spin_unlock_bh(&ifa->state_lock);
2957
2958 if (state != INET6_IFADDR_STATE_DEAD) {
2959 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2960 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2961 }
2962 in6_ifa_put(ifa);
2963
2964 write_lock_bh(&idev->lock);
2965 }
2966
2967 write_unlock_bh(&idev->lock);
2968
2969 /* Step 5: Discard multicast list */
2970 if (how)
2971 ipv6_mc_destroy_dev(idev);
2972 else
2973 ipv6_mc_down(idev);
2974
2975 idev->tstamp = jiffies;
2976
2977 /* Last: Shot the device (if unregistered) */
2978 if (how) {
2979 addrconf_sysctl_unregister(idev);
2980 neigh_parms_release(&nd_tbl, idev->nd_parms);
2981 neigh_ifdown(&nd_tbl, dev);
2982 in6_dev_put(idev);
2983 }
2984 return 0;
2985 }
2986
2987 static void addrconf_rs_timer(unsigned long data)
2988 {
2989 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2990 struct inet6_dev *idev = ifp->idev;
2991
2992 read_lock(&idev->lock);
2993 if (idev->dead || !(idev->if_flags & IF_READY))
2994 goto out;
2995
2996 if (!ipv6_accept_ra(idev))
2997 goto out;
2998
2999 /* Announcement received after solicitation was sent */
3000 if (idev->if_flags & IF_RA_RCVD)
3001 goto out;
3002
3003 spin_lock(&ifp->lock);
3004 if (ifp->probes++ < idev->cnf.rtr_solicits) {
3005 /* The wait after the last probe can be shorter */
3006 addrconf_mod_timer(ifp, AC_RS,
3007 (ifp->probes == idev->cnf.rtr_solicits) ?
3008 idev->cnf.rtr_solicit_delay :
3009 idev->cnf.rtr_solicit_interval);
3010 spin_unlock(&ifp->lock);
3011
3012 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3013 } else {
3014 spin_unlock(&ifp->lock);
3015 /*
3016 * Note: we do not support deprecated "all on-link"
3017 * assumption any longer.
3018 */
3019 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3020 }
3021
3022 out:
3023 read_unlock(&idev->lock);
3024 in6_ifa_put(ifp);
3025 }
3026
3027 /*
3028 * Duplicate Address Detection
3029 */
3030 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3031 {
3032 unsigned long rand_num;
3033 struct inet6_dev *idev = ifp->idev;
3034
3035 if (ifp->flags & IFA_F_OPTIMISTIC)
3036 rand_num = 0;
3037 else
3038 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3039
3040 ifp->probes = idev->cnf.dad_transmits;
3041 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3042 }
3043
3044 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3045 {
3046 struct inet6_dev *idev = ifp->idev;
3047 struct net_device *dev = idev->dev;
3048
3049 addrconf_join_solict(dev, &ifp->addr);
3050
3051 net_srandom(ifp->addr.s6_addr32[3]);
3052
3053 read_lock_bh(&idev->lock);
3054 spin_lock(&ifp->lock);
3055 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3056 goto out;
3057
3058 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3059 idev->cnf.accept_dad < 1 ||
3060 !(ifp->flags&IFA_F_TENTATIVE) ||
3061 ifp->flags & IFA_F_NODAD) {
3062 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3063 spin_unlock(&ifp->lock);
3064 read_unlock_bh(&idev->lock);
3065
3066 addrconf_dad_completed(ifp);
3067 return;
3068 }
3069
3070 if (!(idev->if_flags & IF_READY)) {
3071 spin_unlock(&ifp->lock);
3072 read_unlock_bh(&idev->lock);
3073 /*
3074 * If the device is not ready:
3075 * - keep it tentative if it is a permanent address.
3076 * - otherwise, kill it.
3077 */
3078 in6_ifa_hold(ifp);
3079 addrconf_dad_stop(ifp, 0);
3080 return;
3081 }
3082
3083 /*
3084 * Optimistic nodes can start receiving
3085 * Frames right away
3086 */
3087 if (ifp->flags & IFA_F_OPTIMISTIC)
3088 ip6_ins_rt(ifp->rt);
3089
3090 addrconf_dad_kick(ifp);
3091 out:
3092 spin_unlock(&ifp->lock);
3093 read_unlock_bh(&idev->lock);
3094 }
3095
3096 static void addrconf_dad_timer(unsigned long data)
3097 {
3098 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3099 struct inet6_dev *idev = ifp->idev;
3100 struct in6_addr mcaddr;
3101
3102 if (!ifp->probes && addrconf_dad_end(ifp))
3103 goto out;
3104
3105 read_lock(&idev->lock);
3106 if (idev->dead || !(idev->if_flags & IF_READY)) {
3107 read_unlock(&idev->lock);
3108 goto out;
3109 }
3110
3111 spin_lock(&ifp->lock);
3112 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3113 spin_unlock(&ifp->lock);
3114 read_unlock(&idev->lock);
3115 goto out;
3116 }
3117
3118 if (ifp->probes == 0) {
3119 /*
3120 * DAD was successful
3121 */
3122
3123 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3124 spin_unlock(&ifp->lock);
3125 read_unlock(&idev->lock);
3126
3127 addrconf_dad_completed(ifp);
3128
3129 goto out;
3130 }
3131
3132 ifp->probes--;
3133 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3134 spin_unlock(&ifp->lock);
3135 read_unlock(&idev->lock);
3136
3137 /* send a neighbour solicitation for our addr */
3138 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3139 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3140 out:
3141 in6_ifa_put(ifp);
3142 }
3143
3144 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3145 {
3146 struct net_device *dev = ifp->idev->dev;
3147
3148 /*
3149 * Configure the address for reception. Now it is valid.
3150 */
3151
3152 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3153
3154 /* If added prefix is link local and we are prepared to process
3155 router advertisements, start sending router solicitations.
3156 */
3157
3158 if (ipv6_accept_ra(ifp->idev) &&
3159 ifp->idev->cnf.rtr_solicits > 0 &&
3160 (dev->flags&IFF_LOOPBACK) == 0 &&
3161 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3162 /*
3163 * If a host as already performed a random delay
3164 * [...] as part of DAD [...] there is no need
3165 * to delay again before sending the first RS
3166 */
3167 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3168
3169 spin_lock_bh(&ifp->lock);
3170 ifp->probes = 1;
3171 ifp->idev->if_flags |= IF_RS_SENT;
3172 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3173 spin_unlock_bh(&ifp->lock);
3174 }
3175 }
3176
3177 static void addrconf_dad_run(struct inet6_dev *idev)
3178 {
3179 struct inet6_ifaddr *ifp;
3180
3181 read_lock_bh(&idev->lock);
3182 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3183 spin_lock(&ifp->lock);
3184 if (ifp->flags & IFA_F_TENTATIVE &&
3185 ifp->state == INET6_IFADDR_STATE_DAD)
3186 addrconf_dad_kick(ifp);
3187 spin_unlock(&ifp->lock);
3188 }
3189 read_unlock_bh(&idev->lock);
3190 }
3191
3192 #ifdef CONFIG_PROC_FS
3193 struct if6_iter_state {
3194 struct seq_net_private p;
3195 int bucket;
3196 int offset;
3197 };
3198
3199 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3200 {
3201 struct inet6_ifaddr *ifa = NULL;
3202 struct if6_iter_state *state = seq->private;
3203 struct net *net = seq_file_net(seq);
3204 int p = 0;
3205
3206 /* initial bucket if pos is 0 */
3207 if (pos == 0) {
3208 state->bucket = 0;
3209 state->offset = 0;
3210 }
3211
3212 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3213 struct hlist_node *n;
3214 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3215 addr_lst) {
3216 if (!net_eq(dev_net(ifa->idev->dev), net))
3217 continue;
3218 /* sync with offset */
3219 if (p < state->offset) {
3220 p++;
3221 continue;
3222 }
3223 state->offset++;
3224 return ifa;
3225 }
3226
3227 /* prepare for next bucket */
3228 state->offset = 0;
3229 p = 0;
3230 }
3231 return NULL;
3232 }
3233
3234 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3235 struct inet6_ifaddr *ifa)
3236 {
3237 struct if6_iter_state *state = seq->private;
3238 struct net *net = seq_file_net(seq);
3239 struct hlist_node *n = &ifa->addr_lst;
3240
3241 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3242 if (!net_eq(dev_net(ifa->idev->dev), net))
3243 continue;
3244 state->offset++;
3245 return ifa;
3246 }
3247
3248 while (++state->bucket < IN6_ADDR_HSIZE) {
3249 state->offset = 0;
3250 hlist_for_each_entry_rcu_bh(ifa, n,
3251 &inet6_addr_lst[state->bucket], addr_lst) {
3252 if (!net_eq(dev_net(ifa->idev->dev), net))
3253 continue;
3254 state->offset++;
3255 return ifa;
3256 }
3257 }
3258
3259 return NULL;
3260 }
3261
3262 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3263 __acquires(rcu_bh)
3264 {
3265 rcu_read_lock_bh();
3266 return if6_get_first(seq, *pos);
3267 }
3268
3269 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3270 {
3271 struct inet6_ifaddr *ifa;
3272
3273 ifa = if6_get_next(seq, v);
3274 ++*pos;
3275 return ifa;
3276 }
3277
3278 static void if6_seq_stop(struct seq_file *seq, void *v)
3279 __releases(rcu_bh)
3280 {
3281 rcu_read_unlock_bh();
3282 }
3283
3284 static int if6_seq_show(struct seq_file *seq, void *v)
3285 {
3286 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3287 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3288 &ifp->addr,
3289 ifp->idev->dev->ifindex,
3290 ifp->prefix_len,
3291 ifp->scope,
3292 ifp->flags,
3293 ifp->idev->dev->name);
3294 return 0;
3295 }
3296
3297 static const struct seq_operations if6_seq_ops = {
3298 .start = if6_seq_start,
3299 .next = if6_seq_next,
3300 .show = if6_seq_show,
3301 .stop = if6_seq_stop,
3302 };
3303
3304 static int if6_seq_open(struct inode *inode, struct file *file)
3305 {
3306 return seq_open_net(inode, file, &if6_seq_ops,
3307 sizeof(struct if6_iter_state));
3308 }
3309
3310 static const struct file_operations if6_fops = {
3311 .owner = THIS_MODULE,
3312 .open = if6_seq_open,
3313 .read = seq_read,
3314 .llseek = seq_lseek,
3315 .release = seq_release_net,
3316 };
3317
3318 static int __net_init if6_proc_net_init(struct net *net)
3319 {
3320 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3321 return -ENOMEM;
3322 return 0;
3323 }
3324
3325 static void __net_exit if6_proc_net_exit(struct net *net)
3326 {
3327 proc_net_remove(net, "if_inet6");
3328 }
3329
3330 static struct pernet_operations if6_proc_net_ops = {
3331 .init = if6_proc_net_init,
3332 .exit = if6_proc_net_exit,
3333 };
3334
3335 int __init if6_proc_init(void)
3336 {
3337 return register_pernet_subsys(&if6_proc_net_ops);
3338 }
3339
3340 void if6_proc_exit(void)
3341 {
3342 unregister_pernet_subsys(&if6_proc_net_ops);
3343 }
3344 #endif /* CONFIG_PROC_FS */
3345
3346 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3347 /* Check if address is a home address configured on any interface. */
3348 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3349 {
3350 int ret = 0;
3351 struct inet6_ifaddr *ifp = NULL;
3352 struct hlist_node *n;
3353 unsigned int hash = inet6_addr_hash(addr);
3354
3355 rcu_read_lock_bh();
3356 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3357 if (!net_eq(dev_net(ifp->idev->dev), net))
3358 continue;
3359 if (ipv6_addr_equal(&ifp->addr, addr) &&
3360 (ifp->flags & IFA_F_HOMEADDRESS)) {
3361 ret = 1;
3362 break;
3363 }
3364 }
3365 rcu_read_unlock_bh();
3366 return ret;
3367 }
3368 #endif
3369
3370 /*
3371 * Periodic address status verification
3372 */
3373
3374 static void addrconf_verify(unsigned long foo)
3375 {
3376 unsigned long now, next, next_sec, next_sched;
3377 struct inet6_ifaddr *ifp;
3378 struct hlist_node *node;
3379 int i;
3380
3381 rcu_read_lock_bh();
3382 spin_lock(&addrconf_verify_lock);
3383 now = jiffies;
3384 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3385
3386 del_timer(&addr_chk_timer);
3387
3388 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3389 restart:
3390 hlist_for_each_entry_rcu_bh(ifp, node,
3391 &inet6_addr_lst[i], addr_lst) {
3392 unsigned long age;
3393
3394 if (ifp->flags & IFA_F_PERMANENT)
3395 continue;
3396
3397 spin_lock(&ifp->lock);
3398 /* We try to batch several events at once. */
3399 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3400
3401 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3402 age >= ifp->valid_lft) {
3403 spin_unlock(&ifp->lock);
3404 in6_ifa_hold(ifp);
3405 ipv6_del_addr(ifp);
3406 goto restart;
3407 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3408 spin_unlock(&ifp->lock);
3409 continue;
3410 } else if (age >= ifp->prefered_lft) {
3411 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3412 int deprecate = 0;
3413
3414 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3415 deprecate = 1;
3416 ifp->flags |= IFA_F_DEPRECATED;
3417 }
3418
3419 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3420 next = ifp->tstamp + ifp->valid_lft * HZ;
3421
3422 spin_unlock(&ifp->lock);
3423
3424 if (deprecate) {
3425 in6_ifa_hold(ifp);
3426
3427 ipv6_ifa_notify(0, ifp);
3428 in6_ifa_put(ifp);
3429 goto restart;
3430 }
3431 #ifdef CONFIG_IPV6_PRIVACY
3432 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3433 !(ifp->flags&IFA_F_TENTATIVE)) {
3434 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3435 ifp->idev->cnf.dad_transmits *
3436 ifp->idev->nd_parms->retrans_time / HZ;
3437
3438 if (age >= ifp->prefered_lft - regen_advance) {
3439 struct inet6_ifaddr *ifpub = ifp->ifpub;
3440 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3441 next = ifp->tstamp + ifp->prefered_lft * HZ;
3442 if (!ifp->regen_count && ifpub) {
3443 ifp->regen_count++;
3444 in6_ifa_hold(ifp);
3445 in6_ifa_hold(ifpub);
3446 spin_unlock(&ifp->lock);
3447
3448 spin_lock(&ifpub->lock);
3449 ifpub->regen_count = 0;
3450 spin_unlock(&ifpub->lock);
3451 ipv6_create_tempaddr(ifpub, ifp);
3452 in6_ifa_put(ifpub);
3453 in6_ifa_put(ifp);
3454 goto restart;
3455 }
3456 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3457 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3458 spin_unlock(&ifp->lock);
3459 #endif
3460 } else {
3461 /* ifp->prefered_lft <= ifp->valid_lft */
3462 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3463 next = ifp->tstamp + ifp->prefered_lft * HZ;
3464 spin_unlock(&ifp->lock);
3465 }
3466 }
3467 }
3468
3469 next_sec = round_jiffies_up(next);
3470 next_sched = next;
3471
3472 /* If rounded timeout is accurate enough, accept it. */
3473 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3474 next_sched = next_sec;
3475
3476 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3477 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3478 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3479
3480 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3481 now, next, next_sec, next_sched));
3482
3483 addr_chk_timer.expires = next_sched;
3484 add_timer(&addr_chk_timer);
3485 spin_unlock(&addrconf_verify_lock);
3486 rcu_read_unlock_bh();
3487 }
3488
3489 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3490 {
3491 struct in6_addr *pfx = NULL;
3492
3493 if (addr)
3494 pfx = nla_data(addr);
3495
3496 if (local) {
3497 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3498 pfx = NULL;
3499 else
3500 pfx = nla_data(local);
3501 }
3502
3503 return pfx;
3504 }
3505
3506 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3507 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3508 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3509 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3510 };
3511
3512 static int
3513 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3514 {
3515 struct net *net = sock_net(skb->sk);
3516 struct ifaddrmsg *ifm;
3517 struct nlattr *tb[IFA_MAX+1];
3518 struct in6_addr *pfx;
3519 int err;
3520
3521 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3522 if (err < 0)
3523 return err;
3524
3525 ifm = nlmsg_data(nlh);
3526 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3527 if (pfx == NULL)
3528 return -EINVAL;
3529
3530 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3531 }
3532
3533 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3534 u32 prefered_lft, u32 valid_lft)
3535 {
3536 u32 flags;
3537 clock_t expires;
3538 unsigned long timeout;
3539
3540 if (!valid_lft || (prefered_lft > valid_lft))
3541 return -EINVAL;
3542
3543 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3544 if (addrconf_finite_timeout(timeout)) {
3545 expires = jiffies_to_clock_t(timeout * HZ);
3546 valid_lft = timeout;
3547 flags = RTF_EXPIRES;
3548 } else {
3549 expires = 0;
3550 flags = 0;
3551 ifa_flags |= IFA_F_PERMANENT;
3552 }
3553
3554 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3555 if (addrconf_finite_timeout(timeout)) {
3556 if (timeout == 0)
3557 ifa_flags |= IFA_F_DEPRECATED;
3558 prefered_lft = timeout;
3559 }
3560
3561 spin_lock_bh(&ifp->lock);
3562 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3563 ifp->tstamp = jiffies;
3564 ifp->valid_lft = valid_lft;
3565 ifp->prefered_lft = prefered_lft;
3566
3567 spin_unlock_bh(&ifp->lock);
3568 if (!(ifp->flags&IFA_F_TENTATIVE))
3569 ipv6_ifa_notify(0, ifp);
3570
3571 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3572 expires, flags);
3573 addrconf_verify(0);
3574
3575 return 0;
3576 }
3577
3578 static int
3579 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3580 {
3581 struct net *net = sock_net(skb->sk);
3582 struct ifaddrmsg *ifm;
3583 struct nlattr *tb[IFA_MAX+1];
3584 struct in6_addr *pfx;
3585 struct inet6_ifaddr *ifa;
3586 struct net_device *dev;
3587 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3588 u8 ifa_flags;
3589 int err;
3590
3591 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3592 if (err < 0)
3593 return err;
3594
3595 ifm = nlmsg_data(nlh);
3596 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3597 if (pfx == NULL)
3598 return -EINVAL;
3599
3600 if (tb[IFA_CACHEINFO]) {
3601 struct ifa_cacheinfo *ci;
3602
3603 ci = nla_data(tb[IFA_CACHEINFO]);
3604 valid_lft = ci->ifa_valid;
3605 preferred_lft = ci->ifa_prefered;
3606 } else {
3607 preferred_lft = INFINITY_LIFE_TIME;
3608 valid_lft = INFINITY_LIFE_TIME;
3609 }
3610
3611 dev = __dev_get_by_index(net, ifm->ifa_index);
3612 if (dev == NULL)
3613 return -ENODEV;
3614
3615 /* We ignore other flags so far. */
3616 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3617
3618 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3619 if (ifa == NULL) {
3620 /*
3621 * It would be best to check for !NLM_F_CREATE here but
3622 * userspace alreay relies on not having to provide this.
3623 */
3624 return inet6_addr_add(net, ifm->ifa_index, pfx,
3625 ifm->ifa_prefixlen, ifa_flags,
3626 preferred_lft, valid_lft);
3627 }
3628
3629 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3630 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3631 err = -EEXIST;
3632 else
3633 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3634
3635 in6_ifa_put(ifa);
3636
3637 return err;
3638 }
3639
3640 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3641 u8 scope, int ifindex)
3642 {
3643 struct ifaddrmsg *ifm;
3644
3645 ifm = nlmsg_data(nlh);
3646 ifm->ifa_family = AF_INET6;
3647 ifm->ifa_prefixlen = prefixlen;
3648 ifm->ifa_flags = flags;
3649 ifm->ifa_scope = scope;
3650 ifm->ifa_index = ifindex;
3651 }
3652
3653 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3654 unsigned long tstamp, u32 preferred, u32 valid)
3655 {
3656 struct ifa_cacheinfo ci;
3657
3658 ci.cstamp = cstamp_delta(cstamp);
3659 ci.tstamp = cstamp_delta(tstamp);
3660 ci.ifa_prefered = preferred;
3661 ci.ifa_valid = valid;
3662
3663 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3664 }
3665
3666 static inline int rt_scope(int ifa_scope)
3667 {
3668 if (ifa_scope & IFA_HOST)
3669 return RT_SCOPE_HOST;
3670 else if (ifa_scope & IFA_LINK)
3671 return RT_SCOPE_LINK;
3672 else if (ifa_scope & IFA_SITE)
3673 return RT_SCOPE_SITE;
3674 else
3675 return RT_SCOPE_UNIVERSE;
3676 }
3677
3678 static inline int inet6_ifaddr_msgsize(void)
3679 {
3680 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3681 + nla_total_size(16) /* IFA_ADDRESS */
3682 + nla_total_size(sizeof(struct ifa_cacheinfo));
3683 }
3684
3685 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3686 u32 portid, u32 seq, int event, unsigned int flags)
3687 {
3688 struct nlmsghdr *nlh;
3689 u32 preferred, valid;
3690
3691 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3692 if (nlh == NULL)
3693 return -EMSGSIZE;
3694
3695 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3696 ifa->idev->dev->ifindex);
3697
3698 if (!(ifa->flags&IFA_F_PERMANENT)) {
3699 preferred = ifa->prefered_lft;
3700 valid = ifa->valid_lft;
3701 if (preferred != INFINITY_LIFE_TIME) {
3702 long tval = (jiffies - ifa->tstamp)/HZ;
3703 if (preferred > tval)
3704 preferred -= tval;
3705 else
3706 preferred = 0;
3707 if (valid != INFINITY_LIFE_TIME) {
3708 if (valid > tval)
3709 valid -= tval;
3710 else
3711 valid = 0;
3712 }
3713 }
3714 } else {
3715 preferred = INFINITY_LIFE_TIME;
3716 valid = INFINITY_LIFE_TIME;
3717 }
3718
3719 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3720 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3721 nlmsg_cancel(skb, nlh);
3722 return -EMSGSIZE;
3723 }
3724
3725 return nlmsg_end(skb, nlh);
3726 }
3727
3728 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3729 u32 portid, u32 seq, int event, u16 flags)
3730 {
3731 struct nlmsghdr *nlh;
3732 u8 scope = RT_SCOPE_UNIVERSE;
3733 int ifindex = ifmca->idev->dev->ifindex;
3734
3735 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3736 scope = RT_SCOPE_SITE;
3737
3738 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3739 if (nlh == NULL)
3740 return -EMSGSIZE;
3741
3742 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3743 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3744 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3745 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3746 nlmsg_cancel(skb, nlh);
3747 return -EMSGSIZE;
3748 }
3749
3750 return nlmsg_end(skb, nlh);
3751 }
3752
3753 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3754 u32 portid, u32 seq, int event, unsigned int flags)
3755 {
3756 struct nlmsghdr *nlh;
3757 u8 scope = RT_SCOPE_UNIVERSE;
3758 int ifindex = ifaca->aca_idev->dev->ifindex;
3759
3760 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3761 scope = RT_SCOPE_SITE;
3762
3763 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3764 if (nlh == NULL)
3765 return -EMSGSIZE;
3766
3767 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3768 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3769 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3770 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3771 nlmsg_cancel(skb, nlh);
3772 return -EMSGSIZE;
3773 }
3774
3775 return nlmsg_end(skb, nlh);
3776 }
3777
3778 enum addr_type_t {
3779 UNICAST_ADDR,
3780 MULTICAST_ADDR,
3781 ANYCAST_ADDR,
3782 };
3783
3784 /* called with rcu_read_lock() */
3785 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3786 struct netlink_callback *cb, enum addr_type_t type,
3787 int s_ip_idx, int *p_ip_idx)
3788 {
3789 struct ifmcaddr6 *ifmca;
3790 struct ifacaddr6 *ifaca;
3791 int err = 1;
3792 int ip_idx = *p_ip_idx;
3793
3794 read_lock_bh(&idev->lock);
3795 switch (type) {
3796 case UNICAST_ADDR: {
3797 struct inet6_ifaddr *ifa;
3798
3799 /* unicast address incl. temp addr */
3800 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3801 if (++ip_idx < s_ip_idx)
3802 continue;
3803 err = inet6_fill_ifaddr(skb, ifa,
3804 NETLINK_CB(cb->skb).portid,
3805 cb->nlh->nlmsg_seq,
3806 RTM_NEWADDR,
3807 NLM_F_MULTI);
3808 if (err <= 0)
3809 break;
3810 }
3811 break;
3812 }
3813 case MULTICAST_ADDR:
3814 /* multicast address */
3815 for (ifmca = idev->mc_list; ifmca;
3816 ifmca = ifmca->next, ip_idx++) {
3817 if (ip_idx < s_ip_idx)
3818 continue;
3819 err = inet6_fill_ifmcaddr(skb, ifmca,
3820 NETLINK_CB(cb->skb).portid,
3821 cb->nlh->nlmsg_seq,
3822 RTM_GETMULTICAST,
3823 NLM_F_MULTI);
3824 if (err <= 0)
3825 break;
3826 }
3827 break;
3828 case ANYCAST_ADDR:
3829 /* anycast address */
3830 for (ifaca = idev->ac_list; ifaca;
3831 ifaca = ifaca->aca_next, ip_idx++) {
3832 if (ip_idx < s_ip_idx)
3833 continue;
3834 err = inet6_fill_ifacaddr(skb, ifaca,
3835 NETLINK_CB(cb->skb).portid,
3836 cb->nlh->nlmsg_seq,
3837 RTM_GETANYCAST,
3838 NLM_F_MULTI);
3839 if (err <= 0)
3840 break;
3841 }
3842 break;
3843 default:
3844 break;
3845 }
3846 read_unlock_bh(&idev->lock);
3847 *p_ip_idx = ip_idx;
3848 return err;
3849 }
3850
3851 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3852 enum addr_type_t type)
3853 {
3854 struct net *net = sock_net(skb->sk);
3855 int h, s_h;
3856 int idx, ip_idx;
3857 int s_idx, s_ip_idx;
3858 struct net_device *dev;
3859 struct inet6_dev *idev;
3860 struct hlist_head *head;
3861 struct hlist_node *node;
3862
3863 s_h = cb->args[0];
3864 s_idx = idx = cb->args[1];
3865 s_ip_idx = ip_idx = cb->args[2];
3866
3867 rcu_read_lock();
3868 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3869 idx = 0;
3870 head = &net->dev_index_head[h];
3871 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3872 if (idx < s_idx)
3873 goto cont;
3874 if (h > s_h || idx > s_idx)
3875 s_ip_idx = 0;
3876 ip_idx = 0;
3877 idev = __in6_dev_get(dev);
3878 if (!idev)
3879 goto cont;
3880
3881 if (in6_dump_addrs(idev, skb, cb, type,
3882 s_ip_idx, &ip_idx) <= 0)
3883 goto done;
3884 cont:
3885 idx++;
3886 }
3887 }
3888 done:
3889 rcu_read_unlock();
3890 cb->args[0] = h;
3891 cb->args[1] = idx;
3892 cb->args[2] = ip_idx;
3893
3894 return skb->len;
3895 }
3896
3897 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3898 {
3899 enum addr_type_t type = UNICAST_ADDR;
3900
3901 return inet6_dump_addr(skb, cb, type);
3902 }
3903
3904 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3905 {
3906 enum addr_type_t type = MULTICAST_ADDR;
3907
3908 return inet6_dump_addr(skb, cb, type);
3909 }
3910
3911
3912 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3913 {
3914 enum addr_type_t type = ANYCAST_ADDR;
3915
3916 return inet6_dump_addr(skb, cb, type);
3917 }
3918
3919 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3920 void *arg)
3921 {
3922 struct net *net = sock_net(in_skb->sk);
3923 struct ifaddrmsg *ifm;
3924 struct nlattr *tb[IFA_MAX+1];
3925 struct in6_addr *addr = NULL;
3926 struct net_device *dev = NULL;
3927 struct inet6_ifaddr *ifa;
3928 struct sk_buff *skb;
3929 int err;
3930
3931 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3932 if (err < 0)
3933 goto errout;
3934
3935 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3936 if (addr == NULL) {
3937 err = -EINVAL;
3938 goto errout;
3939 }
3940
3941 ifm = nlmsg_data(nlh);
3942 if (ifm->ifa_index)
3943 dev = __dev_get_by_index(net, ifm->ifa_index);
3944
3945 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3946 if (!ifa) {
3947 err = -EADDRNOTAVAIL;
3948 goto errout;
3949 }
3950
3951 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3952 if (!skb) {
3953 err = -ENOBUFS;
3954 goto errout_ifa;
3955 }
3956
3957 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
3958 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3959 if (err < 0) {
3960 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3961 WARN_ON(err == -EMSGSIZE);
3962 kfree_skb(skb);
3963 goto errout_ifa;
3964 }
3965 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3966 errout_ifa:
3967 in6_ifa_put(ifa);
3968 errout:
3969 return err;
3970 }
3971
3972 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3973 {
3974 struct sk_buff *skb;
3975 struct net *net = dev_net(ifa->idev->dev);
3976 int err = -ENOBUFS;
3977
3978 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3979 if (skb == NULL)
3980 goto errout;
3981
3982 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3983 if (err < 0) {
3984 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3985 WARN_ON(err == -EMSGSIZE);
3986 kfree_skb(skb);
3987 goto errout;
3988 }
3989 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3990 return;
3991 errout:
3992 if (err < 0)
3993 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3994 }
3995
3996 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3997 __s32 *array, int bytes)
3998 {
3999 BUG_ON(bytes < (DEVCONF_MAX * 4));
4000
4001 memset(array, 0, bytes);
4002 array[DEVCONF_FORWARDING] = cnf->forwarding;
4003 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4004 array[DEVCONF_MTU6] = cnf->mtu6;
4005 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4006 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4007 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4008 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4009 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4010 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4011 jiffies_to_msecs(cnf->rtr_solicit_interval);
4012 array[DEVCONF_RTR_SOLICIT_DELAY] =
4013 jiffies_to_msecs(cnf->rtr_solicit_delay);
4014 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4015 #ifdef CONFIG_IPV6_PRIVACY
4016 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4017 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4018 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4019 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4020 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4021 #endif
4022 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4023 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4024 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4025 #ifdef CONFIG_IPV6_ROUTER_PREF
4026 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4027 array[DEVCONF_RTR_PROBE_INTERVAL] =
4028 jiffies_to_msecs(cnf->rtr_probe_interval);
4029 #ifdef CONFIG_IPV6_ROUTE_INFO
4030 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4031 #endif
4032 #endif
4033 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4034 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4035 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4036 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4037 #endif
4038 #ifdef CONFIG_IPV6_MROUTE
4039 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4040 #endif
4041 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4042 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4043 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4044 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4045 }
4046
4047 static inline size_t inet6_ifla6_size(void)
4048 {
4049 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4050 + nla_total_size(sizeof(struct ifla_cacheinfo))
4051 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4052 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4053 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
4054 }
4055
4056 static inline size_t inet6_if_nlmsg_size(void)
4057 {
4058 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4059 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4060 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4061 + nla_total_size(4) /* IFLA_MTU */
4062 + nla_total_size(4) /* IFLA_LINK */
4063 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4064 }
4065
4066 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4067 int items, int bytes)
4068 {
4069 int i;
4070 int pad = bytes - sizeof(u64) * items;
4071 BUG_ON(pad < 0);
4072
4073 /* Use put_unaligned() because stats may not be aligned for u64. */
4074 put_unaligned(items, &stats[0]);
4075 for (i = 1; i < items; i++)
4076 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4077
4078 memset(&stats[items], 0, pad);
4079 }
4080
4081 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4082 int items, int bytes, size_t syncpoff)
4083 {
4084 int i;
4085 int pad = bytes - sizeof(u64) * items;
4086 BUG_ON(pad < 0);
4087
4088 /* Use put_unaligned() because stats may not be aligned for u64. */
4089 put_unaligned(items, &stats[0]);
4090 for (i = 1; i < items; i++)
4091 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4092
4093 memset(&stats[items], 0, pad);
4094 }
4095
4096 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4097 int bytes)
4098 {
4099 switch (attrtype) {
4100 case IFLA_INET6_STATS:
4101 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4102 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4103 break;
4104 case IFLA_INET6_ICMP6STATS:
4105 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4106 break;
4107 }
4108 }
4109
4110 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4111 {
4112 struct nlattr *nla;
4113 struct ifla_cacheinfo ci;
4114
4115 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4116 goto nla_put_failure;
4117 ci.max_reasm_len = IPV6_MAXPLEN;
4118 ci.tstamp = cstamp_delta(idev->tstamp);
4119 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4120 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4121 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4122 goto nla_put_failure;
4123 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4124 if (nla == NULL)
4125 goto nla_put_failure;
4126 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4127
4128 /* XXX - MC not implemented */
4129
4130 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4131 if (nla == NULL)
4132 goto nla_put_failure;
4133 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4134
4135 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4136 if (nla == NULL)
4137 goto nla_put_failure;
4138 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4139
4140 return 0;
4141
4142 nla_put_failure:
4143 return -EMSGSIZE;
4144 }
4145
4146 static size_t inet6_get_link_af_size(const struct net_device *dev)
4147 {
4148 if (!__in6_dev_get(dev))
4149 return 0;
4150
4151 return inet6_ifla6_size();
4152 }
4153
4154 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4155 {
4156 struct inet6_dev *idev = __in6_dev_get(dev);
4157
4158 if (!idev)
4159 return -ENODATA;
4160
4161 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4162 return -EMSGSIZE;
4163
4164 return 0;
4165 }
4166
4167 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4168 u32 portid, u32 seq, int event, unsigned int flags)
4169 {
4170 struct net_device *dev = idev->dev;
4171 struct ifinfomsg *hdr;
4172 struct nlmsghdr *nlh;
4173 void *protoinfo;
4174
4175 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4176 if (nlh == NULL)
4177 return -EMSGSIZE;
4178
4179 hdr = nlmsg_data(nlh);
4180 hdr->ifi_family = AF_INET6;
4181 hdr->__ifi_pad = 0;
4182 hdr->ifi_type = dev->type;
4183 hdr->ifi_index = dev->ifindex;
4184 hdr->ifi_flags = dev_get_flags(dev);
4185 hdr->ifi_change = 0;
4186
4187 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4188 (dev->addr_len &&
4189 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4190 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4191 (dev->ifindex != dev->iflink &&
4192 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4193 goto nla_put_failure;
4194 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4195 if (protoinfo == NULL)
4196 goto nla_put_failure;
4197
4198 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4199 goto nla_put_failure;
4200
4201 nla_nest_end(skb, protoinfo);
4202 return nlmsg_end(skb, nlh);
4203
4204 nla_put_failure:
4205 nlmsg_cancel(skb, nlh);
4206 return -EMSGSIZE;
4207 }
4208
4209 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4210 {
4211 struct net *net = sock_net(skb->sk);
4212 int h, s_h;
4213 int idx = 0, s_idx;
4214 struct net_device *dev;
4215 struct inet6_dev *idev;
4216 struct hlist_head *head;
4217 struct hlist_node *node;
4218
4219 s_h = cb->args[0];
4220 s_idx = cb->args[1];
4221
4222 rcu_read_lock();
4223 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4224 idx = 0;
4225 head = &net->dev_index_head[h];
4226 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4227 if (idx < s_idx)
4228 goto cont;
4229 idev = __in6_dev_get(dev);
4230 if (!idev)
4231 goto cont;
4232 if (inet6_fill_ifinfo(skb, idev,
4233 NETLINK_CB(cb->skb).portid,
4234 cb->nlh->nlmsg_seq,
4235 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4236 goto out;
4237 cont:
4238 idx++;
4239 }
4240 }
4241 out:
4242 rcu_read_unlock();
4243 cb->args[1] = idx;
4244 cb->args[0] = h;
4245
4246 return skb->len;
4247 }
4248
4249 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4250 {
4251 struct sk_buff *skb;
4252 struct net *net = dev_net(idev->dev);
4253 int err = -ENOBUFS;
4254
4255 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4256 if (skb == NULL)
4257 goto errout;
4258
4259 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4260 if (err < 0) {
4261 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4262 WARN_ON(err == -EMSGSIZE);
4263 kfree_skb(skb);
4264 goto errout;
4265 }
4266 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4267 return;
4268 errout:
4269 if (err < 0)
4270 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4271 }
4272
4273 static inline size_t inet6_prefix_nlmsg_size(void)
4274 {
4275 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4276 + nla_total_size(sizeof(struct in6_addr))
4277 + nla_total_size(sizeof(struct prefix_cacheinfo));
4278 }
4279
4280 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4281 struct prefix_info *pinfo, u32 portid, u32 seq,
4282 int event, unsigned int flags)
4283 {
4284 struct prefixmsg *pmsg;
4285 struct nlmsghdr *nlh;
4286 struct prefix_cacheinfo ci;
4287
4288 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4289 if (nlh == NULL)
4290 return -EMSGSIZE;
4291
4292 pmsg = nlmsg_data(nlh);
4293 pmsg->prefix_family = AF_INET6;
4294 pmsg->prefix_pad1 = 0;
4295 pmsg->prefix_pad2 = 0;
4296 pmsg->prefix_ifindex = idev->dev->ifindex;
4297 pmsg->prefix_len = pinfo->prefix_len;
4298 pmsg->prefix_type = pinfo->type;
4299 pmsg->prefix_pad3 = 0;
4300 pmsg->prefix_flags = 0;
4301 if (pinfo->onlink)
4302 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4303 if (pinfo->autoconf)
4304 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4305
4306 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4307 goto nla_put_failure;
4308 ci.preferred_time = ntohl(pinfo->prefered);
4309 ci.valid_time = ntohl(pinfo->valid);
4310 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4311 goto nla_put_failure;
4312 return nlmsg_end(skb, nlh);
4313
4314 nla_put_failure:
4315 nlmsg_cancel(skb, nlh);
4316 return -EMSGSIZE;
4317 }
4318
4319 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4320 struct prefix_info *pinfo)
4321 {
4322 struct sk_buff *skb;
4323 struct net *net = dev_net(idev->dev);
4324 int err = -ENOBUFS;
4325
4326 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4327 if (skb == NULL)
4328 goto errout;
4329
4330 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4331 if (err < 0) {
4332 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4333 WARN_ON(err == -EMSGSIZE);
4334 kfree_skb(skb);
4335 goto errout;
4336 }
4337 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4338 return;
4339 errout:
4340 if (err < 0)
4341 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4342 }
4343
4344 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4345 {
4346 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4347
4348 switch (event) {
4349 case RTM_NEWADDR:
4350 /*
4351 * If the address was optimistic
4352 * we inserted the route at the start of
4353 * our DAD process, so we don't need
4354 * to do it again
4355 */
4356 if (!(ifp->rt->rt6i_node))
4357 ip6_ins_rt(ifp->rt);
4358 if (ifp->idev->cnf.forwarding)
4359 addrconf_join_anycast(ifp);
4360 break;
4361 case RTM_DELADDR:
4362 if (ifp->idev->cnf.forwarding)
4363 addrconf_leave_anycast(ifp);
4364 addrconf_leave_solict(ifp->idev, &ifp->addr);
4365 dst_hold(&ifp->rt->dst);
4366
4367 if (ip6_del_rt(ifp->rt))
4368 dst_free(&ifp->rt->dst);
4369 break;
4370 }
4371 }
4372
4373 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4374 {
4375 rcu_read_lock_bh();
4376 if (likely(ifp->idev->dead == 0))
4377 __ipv6_ifa_notify(event, ifp);
4378 rcu_read_unlock_bh();
4379 }
4380
4381 #ifdef CONFIG_SYSCTL
4382
4383 static
4384 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4385 void __user *buffer, size_t *lenp, loff_t *ppos)
4386 {
4387 int *valp = ctl->data;
4388 int val = *valp;
4389 loff_t pos = *ppos;
4390 ctl_table lctl;
4391 int ret;
4392
4393 /*
4394 * ctl->data points to idev->cnf.forwarding, we should
4395 * not modify it until we get the rtnl lock.
4396 */
4397 lctl = *ctl;
4398 lctl.data = &val;
4399
4400 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4401
4402 if (write)
4403 ret = addrconf_fixup_forwarding(ctl, valp, val);
4404 if (ret)
4405 *ppos = pos;
4406 return ret;
4407 }
4408
4409 static void dev_disable_change(struct inet6_dev *idev)
4410 {
4411 if (!idev || !idev->dev)
4412 return;
4413
4414 if (idev->cnf.disable_ipv6)
4415 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4416 else
4417 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4418 }
4419
4420 static void addrconf_disable_change(struct net *net, __s32 newf)
4421 {
4422 struct net_device *dev;
4423 struct inet6_dev *idev;
4424
4425 rcu_read_lock();
4426 for_each_netdev_rcu(net, dev) {
4427 idev = __in6_dev_get(dev);
4428 if (idev) {
4429 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4430 idev->cnf.disable_ipv6 = newf;
4431 if (changed)
4432 dev_disable_change(idev);
4433 }
4434 }
4435 rcu_read_unlock();
4436 }
4437
4438 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4439 {
4440 struct net *net;
4441 int old;
4442
4443 if (!rtnl_trylock())
4444 return restart_syscall();
4445
4446 net = (struct net *)table->extra2;
4447 old = *p;
4448 *p = newf;
4449
4450 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4451 rtnl_unlock();
4452 return 0;
4453 }
4454
4455 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4456 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4457 addrconf_disable_change(net, newf);
4458 } else if ((!newf) ^ (!old))
4459 dev_disable_change((struct inet6_dev *)table->extra1);
4460
4461 rtnl_unlock();
4462 return 0;
4463 }
4464
4465 static
4466 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4467 void __user *buffer, size_t *lenp, loff_t *ppos)
4468 {
4469 int *valp = ctl->data;
4470 int val = *valp;
4471 loff_t pos = *ppos;
4472 ctl_table lctl;
4473 int ret;
4474
4475 /*
4476 * ctl->data points to idev->cnf.disable_ipv6, we should
4477 * not modify it until we get the rtnl lock.
4478 */
4479 lctl = *ctl;
4480 lctl.data = &val;
4481
4482 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4483
4484 if (write)
4485 ret = addrconf_disable_ipv6(ctl, valp, val);
4486 if (ret)
4487 *ppos = pos;
4488 return ret;
4489 }
4490
4491 static struct addrconf_sysctl_table
4492 {
4493 struct ctl_table_header *sysctl_header;
4494 ctl_table addrconf_vars[DEVCONF_MAX+1];
4495 } addrconf_sysctl __read_mostly = {
4496 .sysctl_header = NULL,
4497 .addrconf_vars = {
4498 {
4499 .procname = "forwarding",
4500 .data = &ipv6_devconf.forwarding,
4501 .maxlen = sizeof(int),
4502 .mode = 0644,
4503 .proc_handler = addrconf_sysctl_forward,
4504 },
4505 {
4506 .procname = "hop_limit",
4507 .data = &ipv6_devconf.hop_limit,
4508 .maxlen = sizeof(int),
4509 .mode = 0644,
4510 .proc_handler = proc_dointvec,
4511 },
4512 {
4513 .procname = "mtu",
4514 .data = &ipv6_devconf.mtu6,
4515 .maxlen = sizeof(int),
4516 .mode = 0644,
4517 .proc_handler = proc_dointvec,
4518 },
4519 {
4520 .procname = "accept_ra",
4521 .data = &ipv6_devconf.accept_ra,
4522 .maxlen = sizeof(int),
4523 .mode = 0644,
4524 .proc_handler = proc_dointvec,
4525 },
4526 {
4527 .procname = "accept_redirects",
4528 .data = &ipv6_devconf.accept_redirects,
4529 .maxlen = sizeof(int),
4530 .mode = 0644,
4531 .proc_handler = proc_dointvec,
4532 },
4533 {
4534 .procname = "autoconf",
4535 .data = &ipv6_devconf.autoconf,
4536 .maxlen = sizeof(int),
4537 .mode = 0644,
4538 .proc_handler = proc_dointvec,
4539 },
4540 {
4541 .procname = "dad_transmits",
4542 .data = &ipv6_devconf.dad_transmits,
4543 .maxlen = sizeof(int),
4544 .mode = 0644,
4545 .proc_handler = proc_dointvec,
4546 },
4547 {
4548 .procname = "router_solicitations",
4549 .data = &ipv6_devconf.rtr_solicits,
4550 .maxlen = sizeof(int),
4551 .mode = 0644,
4552 .proc_handler = proc_dointvec,
4553 },
4554 {
4555 .procname = "router_solicitation_interval",
4556 .data = &ipv6_devconf.rtr_solicit_interval,
4557 .maxlen = sizeof(int),
4558 .mode = 0644,
4559 .proc_handler = proc_dointvec_jiffies,
4560 },
4561 {
4562 .procname = "router_solicitation_delay",
4563 .data = &ipv6_devconf.rtr_solicit_delay,
4564 .maxlen = sizeof(int),
4565 .mode = 0644,
4566 .proc_handler = proc_dointvec_jiffies,
4567 },
4568 {
4569 .procname = "force_mld_version",
4570 .data = &ipv6_devconf.force_mld_version,
4571 .maxlen = sizeof(int),
4572 .mode = 0644,
4573 .proc_handler = proc_dointvec,
4574 },
4575 #ifdef CONFIG_IPV6_PRIVACY
4576 {
4577 .procname = "use_tempaddr",
4578 .data = &ipv6_devconf.use_tempaddr,
4579 .maxlen = sizeof(int),
4580 .mode = 0644,
4581 .proc_handler = proc_dointvec,
4582 },
4583 {
4584 .procname = "temp_valid_lft",
4585 .data = &ipv6_devconf.temp_valid_lft,
4586 .maxlen = sizeof(int),
4587 .mode = 0644,
4588 .proc_handler = proc_dointvec,
4589 },
4590 {
4591 .procname = "temp_prefered_lft",
4592 .data = &ipv6_devconf.temp_prefered_lft,
4593 .maxlen = sizeof(int),
4594 .mode = 0644,
4595 .proc_handler = proc_dointvec,
4596 },
4597 {
4598 .procname = "regen_max_retry",
4599 .data = &ipv6_devconf.regen_max_retry,
4600 .maxlen = sizeof(int),
4601 .mode = 0644,
4602 .proc_handler = proc_dointvec,
4603 },
4604 {
4605 .procname = "max_desync_factor",
4606 .data = &ipv6_devconf.max_desync_factor,
4607 .maxlen = sizeof(int),
4608 .mode = 0644,
4609 .proc_handler = proc_dointvec,
4610 },
4611 #endif
4612 {
4613 .procname = "max_addresses",
4614 .data = &ipv6_devconf.max_addresses,
4615 .maxlen = sizeof(int),
4616 .mode = 0644,
4617 .proc_handler = proc_dointvec,
4618 },
4619 {
4620 .procname = "accept_ra_defrtr",
4621 .data = &ipv6_devconf.accept_ra_defrtr,
4622 .maxlen = sizeof(int),
4623 .mode = 0644,
4624 .proc_handler = proc_dointvec,
4625 },
4626 {
4627 .procname = "accept_ra_pinfo",
4628 .data = &ipv6_devconf.accept_ra_pinfo,
4629 .maxlen = sizeof(int),
4630 .mode = 0644,
4631 .proc_handler = proc_dointvec,
4632 },
4633 #ifdef CONFIG_IPV6_ROUTER_PREF
4634 {
4635 .procname = "accept_ra_rtr_pref",
4636 .data = &ipv6_devconf.accept_ra_rtr_pref,
4637 .maxlen = sizeof(int),
4638 .mode = 0644,
4639 .proc_handler = proc_dointvec,
4640 },
4641 {
4642 .procname = "router_probe_interval",
4643 .data = &ipv6_devconf.rtr_probe_interval,
4644 .maxlen = sizeof(int),
4645 .mode = 0644,
4646 .proc_handler = proc_dointvec_jiffies,
4647 },
4648 #ifdef CONFIG_IPV6_ROUTE_INFO
4649 {
4650 .procname = "accept_ra_rt_info_max_plen",
4651 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4652 .maxlen = sizeof(int),
4653 .mode = 0644,
4654 .proc_handler = proc_dointvec,
4655 },
4656 #endif
4657 #endif
4658 {
4659 .procname = "proxy_ndp",
4660 .data = &ipv6_devconf.proxy_ndp,
4661 .maxlen = sizeof(int),
4662 .mode = 0644,
4663 .proc_handler = proc_dointvec,
4664 },
4665 {
4666 .procname = "accept_source_route",
4667 .data = &ipv6_devconf.accept_source_route,
4668 .maxlen = sizeof(int),
4669 .mode = 0644,
4670 .proc_handler = proc_dointvec,
4671 },
4672 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4673 {
4674 .procname = "optimistic_dad",
4675 .data = &ipv6_devconf.optimistic_dad,
4676 .maxlen = sizeof(int),
4677 .mode = 0644,
4678 .proc_handler = proc_dointvec,
4679
4680 },
4681 #endif
4682 #ifdef CONFIG_IPV6_MROUTE
4683 {
4684 .procname = "mc_forwarding",
4685 .data = &ipv6_devconf.mc_forwarding,
4686 .maxlen = sizeof(int),
4687 .mode = 0444,
4688 .proc_handler = proc_dointvec,
4689 },
4690 #endif
4691 {
4692 .procname = "disable_ipv6",
4693 .data = &ipv6_devconf.disable_ipv6,
4694 .maxlen = sizeof(int),
4695 .mode = 0644,
4696 .proc_handler = addrconf_sysctl_disable,
4697 },
4698 {
4699 .procname = "accept_dad",
4700 .data = &ipv6_devconf.accept_dad,
4701 .maxlen = sizeof(int),
4702 .mode = 0644,
4703 .proc_handler = proc_dointvec,
4704 },
4705 {
4706 .procname = "force_tllao",
4707 .data = &ipv6_devconf.force_tllao,
4708 .maxlen = sizeof(int),
4709 .mode = 0644,
4710 .proc_handler = proc_dointvec
4711 },
4712 {
4713 .procname = "ndisc_notify",
4714 .data = &ipv6_devconf.ndisc_notify,
4715 .maxlen = sizeof(int),
4716 .mode = 0644,
4717 .proc_handler = proc_dointvec
4718 },
4719 {
4720 /* sentinel */
4721 }
4722 },
4723 };
4724
4725 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4726 struct inet6_dev *idev, struct ipv6_devconf *p)
4727 {
4728 int i;
4729 struct addrconf_sysctl_table *t;
4730 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4731
4732 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4733 if (t == NULL)
4734 goto out;
4735
4736 for (i = 0; t->addrconf_vars[i].data; i++) {
4737 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4738 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4739 t->addrconf_vars[i].extra2 = net;
4740 }
4741
4742 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4743
4744 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4745 if (t->sysctl_header == NULL)
4746 goto free;
4747
4748 p->sysctl = t;
4749 return 0;
4750
4751 free:
4752 kfree(t);
4753 out:
4754 return -ENOBUFS;
4755 }
4756
4757 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4758 {
4759 struct addrconf_sysctl_table *t;
4760
4761 if (p->sysctl == NULL)
4762 return;
4763
4764 t = p->sysctl;
4765 p->sysctl = NULL;
4766 unregister_net_sysctl_table(t->sysctl_header);
4767 kfree(t);
4768 }
4769
4770 static void addrconf_sysctl_register(struct inet6_dev *idev)
4771 {
4772 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4773 &ndisc_ifinfo_sysctl_change);
4774 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4775 idev, &idev->cnf);
4776 }
4777
4778 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4779 {
4780 __addrconf_sysctl_unregister(&idev->cnf);
4781 neigh_sysctl_unregister(idev->nd_parms);
4782 }
4783
4784
4785 #endif
4786
4787 static int __net_init addrconf_init_net(struct net *net)
4788 {
4789 int err;
4790 struct ipv6_devconf *all, *dflt;
4791
4792 err = -ENOMEM;
4793 all = &ipv6_devconf;
4794 dflt = &ipv6_devconf_dflt;
4795
4796 if (!net_eq(net, &init_net)) {
4797 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4798 if (all == NULL)
4799 goto err_alloc_all;
4800
4801 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4802 if (dflt == NULL)
4803 goto err_alloc_dflt;
4804 } else {
4805 /* these will be inherited by all namespaces */
4806 dflt->autoconf = ipv6_defaults.autoconf;
4807 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4808 }
4809
4810 net->ipv6.devconf_all = all;
4811 net->ipv6.devconf_dflt = dflt;
4812
4813 #ifdef CONFIG_SYSCTL
4814 err = __addrconf_sysctl_register(net, "all", NULL, all);
4815 if (err < 0)
4816 goto err_reg_all;
4817
4818 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4819 if (err < 0)
4820 goto err_reg_dflt;
4821 #endif
4822 return 0;
4823
4824 #ifdef CONFIG_SYSCTL
4825 err_reg_dflt:
4826 __addrconf_sysctl_unregister(all);
4827 err_reg_all:
4828 kfree(dflt);
4829 #endif
4830 err_alloc_dflt:
4831 kfree(all);
4832 err_alloc_all:
4833 return err;
4834 }
4835
4836 static void __net_exit addrconf_exit_net(struct net *net)
4837 {
4838 #ifdef CONFIG_SYSCTL
4839 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4840 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4841 #endif
4842 if (!net_eq(net, &init_net)) {
4843 kfree(net->ipv6.devconf_dflt);
4844 kfree(net->ipv6.devconf_all);
4845 }
4846 }
4847
4848 static struct pernet_operations addrconf_ops = {
4849 .init = addrconf_init_net,
4850 .exit = addrconf_exit_net,
4851 };
4852
4853 /*
4854 * Device notifier
4855 */
4856
4857 int register_inet6addr_notifier(struct notifier_block *nb)
4858 {
4859 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4860 }
4861 EXPORT_SYMBOL(register_inet6addr_notifier);
4862
4863 int unregister_inet6addr_notifier(struct notifier_block *nb)
4864 {
4865 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4866 }
4867 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4868
4869 static struct rtnl_af_ops inet6_ops = {
4870 .family = AF_INET6,
4871 .fill_link_af = inet6_fill_link_af,
4872 .get_link_af_size = inet6_get_link_af_size,
4873 };
4874
4875 /*
4876 * Init / cleanup code
4877 */
4878
4879 int __init addrconf_init(void)
4880 {
4881 int i, err;
4882
4883 err = ipv6_addr_label_init();
4884 if (err < 0) {
4885 pr_crit("%s: cannot initialize default policy table: %d\n",
4886 __func__, err);
4887 goto out;
4888 }
4889
4890 err = register_pernet_subsys(&addrconf_ops);
4891 if (err < 0)
4892 goto out_addrlabel;
4893
4894 /* The addrconf netdev notifier requires that loopback_dev
4895 * has it's ipv6 private information allocated and setup
4896 * before it can bring up and give link-local addresses
4897 * to other devices which are up.
4898 *
4899 * Unfortunately, loopback_dev is not necessarily the first
4900 * entry in the global dev_base list of net devices. In fact,
4901 * it is likely to be the very last entry on that list.
4902 * So this causes the notifier registry below to try and
4903 * give link-local addresses to all devices besides loopback_dev
4904 * first, then loopback_dev, which cases all the non-loopback_dev
4905 * devices to fail to get a link-local address.
4906 *
4907 * So, as a temporary fix, allocate the ipv6 structure for
4908 * loopback_dev first by hand.
4909 * Longer term, all of the dependencies ipv6 has upon the loopback
4910 * device and it being up should be removed.
4911 */
4912 rtnl_lock();
4913 if (!ipv6_add_dev(init_net.loopback_dev))
4914 err = -ENOMEM;
4915 rtnl_unlock();
4916 if (err)
4917 goto errlo;
4918
4919 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4920 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4921
4922 register_netdevice_notifier(&ipv6_dev_notf);
4923
4924 addrconf_verify(0);
4925
4926 err = rtnl_af_register(&inet6_ops);
4927 if (err < 0)
4928 goto errout_af;
4929
4930 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4931 NULL);
4932 if (err < 0)
4933 goto errout;
4934
4935 /* Only the first call to __rtnl_register can fail */
4936 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4937 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4938 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4939 inet6_dump_ifaddr, NULL);
4940 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4941 inet6_dump_ifmcaddr, NULL);
4942 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4943 inet6_dump_ifacaddr, NULL);
4944 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
4945 NULL, NULL);
4946
4947 ipv6_addr_label_rtnl_register();
4948
4949 return 0;
4950 errout:
4951 rtnl_af_unregister(&inet6_ops);
4952 errout_af:
4953 unregister_netdevice_notifier(&ipv6_dev_notf);
4954 errlo:
4955 unregister_pernet_subsys(&addrconf_ops);
4956 out_addrlabel:
4957 ipv6_addr_label_cleanup();
4958 out:
4959 return err;
4960 }
4961
4962 void addrconf_cleanup(void)
4963 {
4964 struct net_device *dev;
4965 int i;
4966
4967 unregister_netdevice_notifier(&ipv6_dev_notf);
4968 unregister_pernet_subsys(&addrconf_ops);
4969 ipv6_addr_label_cleanup();
4970
4971 rtnl_lock();
4972
4973 __rtnl_af_unregister(&inet6_ops);
4974
4975 /* clean dev list */
4976 for_each_netdev(&init_net, dev) {
4977 if (__in6_dev_get(dev) == NULL)
4978 continue;
4979 addrconf_ifdown(dev, 1);
4980 }
4981 addrconf_ifdown(init_net.loopback_dev, 2);
4982
4983 /*
4984 * Check hash table.
4985 */
4986 spin_lock_bh(&addrconf_hash_lock);
4987 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4988 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4989 spin_unlock_bh(&addrconf_hash_lock);
4990
4991 del_timer(&addr_chk_timer);
4992 rtnl_unlock();
4993 }
Linux kernel - Deliverables
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