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netconf: advertise mc_forwarding status
[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 void addrconf_dad_start(struct inet6_ifaddr *ifp);
158 static void addrconf_dad_timer(unsigned long data);
159 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
160 static void addrconf_dad_run(struct inet6_dev *idev);
161 static void addrconf_rs_timer(unsigned long data);
162 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
163 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
164
165 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
166 struct prefix_info *pinfo);
167 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
168 struct net_device *dev);
169
170 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
171
172 static struct ipv6_devconf ipv6_devconf __read_mostly = {
173 .forwarding = 0,
174 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
175 .mtu6 = IPV6_MIN_MTU,
176 .accept_ra = 1,
177 .accept_redirects = 1,
178 .autoconf = 1,
179 .force_mld_version = 0,
180 .dad_transmits = 1,
181 .rtr_solicits = MAX_RTR_SOLICITATIONS,
182 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
183 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
184 #ifdef CONFIG_IPV6_PRIVACY
185 .use_tempaddr = 0,
186 .temp_valid_lft = TEMP_VALID_LIFETIME,
187 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
188 .regen_max_retry = REGEN_MAX_RETRY,
189 .max_desync_factor = MAX_DESYNC_FACTOR,
190 #endif
191 .max_addresses = IPV6_MAX_ADDRESSES,
192 .accept_ra_defrtr = 1,
193 .accept_ra_pinfo = 1,
194 #ifdef CONFIG_IPV6_ROUTER_PREF
195 .accept_ra_rtr_pref = 1,
196 .rtr_probe_interval = 60 * HZ,
197 #ifdef CONFIG_IPV6_ROUTE_INFO
198 .accept_ra_rt_info_max_plen = 0,
199 #endif
200 #endif
201 .proxy_ndp = 0,
202 .accept_source_route = 0, /* we do not accept RH0 by default. */
203 .disable_ipv6 = 0,
204 .accept_dad = 1,
205 };
206
207 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
208 .forwarding = 0,
209 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
210 .mtu6 = IPV6_MIN_MTU,
211 .accept_ra = 1,
212 .accept_redirects = 1,
213 .autoconf = 1,
214 .dad_transmits = 1,
215 .rtr_solicits = MAX_RTR_SOLICITATIONS,
216 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
217 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
218 #ifdef CONFIG_IPV6_PRIVACY
219 .use_tempaddr = 0,
220 .temp_valid_lft = TEMP_VALID_LIFETIME,
221 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
222 .regen_max_retry = REGEN_MAX_RETRY,
223 .max_desync_factor = MAX_DESYNC_FACTOR,
224 #endif
225 .max_addresses = IPV6_MAX_ADDRESSES,
226 .accept_ra_defrtr = 1,
227 .accept_ra_pinfo = 1,
228 #ifdef CONFIG_IPV6_ROUTER_PREF
229 .accept_ra_rtr_pref = 1,
230 .rtr_probe_interval = 60 * HZ,
231 #ifdef CONFIG_IPV6_ROUTE_INFO
232 .accept_ra_rt_info_max_plen = 0,
233 #endif
234 #endif
235 .proxy_ndp = 0,
236 .accept_source_route = 0, /* we do not accept RH0 by default. */
237 .disable_ipv6 = 0,
238 .accept_dad = 1,
239 };
240
241 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
242 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
243 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
244 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
245 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
246
247 /* Check if a valid qdisc is available */
248 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
249 {
250 return !qdisc_tx_is_noop(dev);
251 }
252
253 /* Check if a route is valid prefix route */
254 static inline int addrconf_is_prefix_route(const struct rt6_info *rt)
255 {
256 return (rt->rt6i_flags & (RTF_GATEWAY | RTF_DEFAULT)) == 0;
257 }
258
259 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
260 {
261 if (del_timer(&ifp->timer))
262 __in6_ifa_put(ifp);
263 }
264
265 enum addrconf_timer_t {
266 AC_NONE,
267 AC_DAD,
268 AC_RS,
269 };
270
271 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
272 enum addrconf_timer_t what,
273 unsigned long when)
274 {
275 if (!del_timer(&ifp->timer))
276 in6_ifa_hold(ifp);
277
278 switch (what) {
279 case AC_DAD:
280 ifp->timer.function = addrconf_dad_timer;
281 break;
282 case AC_RS:
283 ifp->timer.function = addrconf_rs_timer;
284 break;
285 default:
286 break;
287 }
288 ifp->timer.expires = jiffies + when;
289 add_timer(&ifp->timer);
290 }
291
292 static int snmp6_alloc_dev(struct inet6_dev *idev)
293 {
294 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
295 sizeof(struct ipstats_mib),
296 __alignof__(struct ipstats_mib)) < 0)
297 goto err_ip;
298 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
299 GFP_KERNEL);
300 if (!idev->stats.icmpv6dev)
301 goto err_icmp;
302 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
303 GFP_KERNEL);
304 if (!idev->stats.icmpv6msgdev)
305 goto err_icmpmsg;
306
307 return 0;
308
309 err_icmpmsg:
310 kfree(idev->stats.icmpv6dev);
311 err_icmp:
312 snmp_mib_free((void __percpu **)idev->stats.ipv6);
313 err_ip:
314 return -ENOMEM;
315 }
316
317 static void snmp6_free_dev(struct inet6_dev *idev)
318 {
319 kfree(idev->stats.icmpv6msgdev);
320 kfree(idev->stats.icmpv6dev);
321 snmp_mib_free((void __percpu **)idev->stats.ipv6);
322 }
323
324 /* Nobody refers to this device, we may destroy it. */
325
326 void in6_dev_finish_destroy(struct inet6_dev *idev)
327 {
328 struct net_device *dev = idev->dev;
329
330 WARN_ON(!list_empty(&idev->addr_list));
331 WARN_ON(idev->mc_list != NULL);
332
333 #ifdef NET_REFCNT_DEBUG
334 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
335 #endif
336 dev_put(dev);
337 if (!idev->dead) {
338 pr_warn("Freeing alive inet6 device %p\n", idev);
339 return;
340 }
341 snmp6_free_dev(idev);
342 kfree_rcu(idev, rcu);
343 }
344 EXPORT_SYMBOL(in6_dev_finish_destroy);
345
346 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
347 {
348 struct inet6_dev *ndev;
349
350 ASSERT_RTNL();
351
352 if (dev->mtu < IPV6_MIN_MTU)
353 return NULL;
354
355 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
356
357 if (ndev == NULL)
358 return NULL;
359
360 rwlock_init(&ndev->lock);
361 ndev->dev = dev;
362 INIT_LIST_HEAD(&ndev->addr_list);
363
364 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
365 ndev->cnf.mtu6 = dev->mtu;
366 ndev->cnf.sysctl = NULL;
367 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
368 if (ndev->nd_parms == NULL) {
369 kfree(ndev);
370 return NULL;
371 }
372 if (ndev->cnf.forwarding)
373 dev_disable_lro(dev);
374 /* We refer to the device */
375 dev_hold(dev);
376
377 if (snmp6_alloc_dev(ndev) < 0) {
378 ADBG((KERN_WARNING
379 "%s: cannot allocate memory for statistics; dev=%s.\n",
380 __func__, dev->name));
381 neigh_parms_release(&nd_tbl, ndev->nd_parms);
382 dev_put(dev);
383 kfree(ndev);
384 return NULL;
385 }
386
387 if (snmp6_register_dev(ndev) < 0) {
388 ADBG((KERN_WARNING
389 "%s: cannot create /proc/net/dev_snmp6/%s\n",
390 __func__, dev->name));
391 neigh_parms_release(&nd_tbl, ndev->nd_parms);
392 ndev->dead = 1;
393 in6_dev_finish_destroy(ndev);
394 return NULL;
395 }
396
397 /* One reference from device. We must do this before
398 * we invoke __ipv6_regen_rndid().
399 */
400 in6_dev_hold(ndev);
401
402 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
403 ndev->cnf.accept_dad = -1;
404
405 #if IS_ENABLED(CONFIG_IPV6_SIT)
406 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
407 pr_info("%s: Disabled Multicast RS\n", dev->name);
408 ndev->cnf.rtr_solicits = 0;
409 }
410 #endif
411
412 #ifdef CONFIG_IPV6_PRIVACY
413 INIT_LIST_HEAD(&ndev->tempaddr_list);
414 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
415 if ((dev->flags&IFF_LOOPBACK) ||
416 dev->type == ARPHRD_TUNNEL ||
417 dev->type == ARPHRD_TUNNEL6 ||
418 dev->type == ARPHRD_SIT ||
419 dev->type == ARPHRD_NONE) {
420 ndev->cnf.use_tempaddr = -1;
421 } else {
422 in6_dev_hold(ndev);
423 ipv6_regen_rndid((unsigned long) ndev);
424 }
425 #endif
426
427 if (netif_running(dev) && addrconf_qdisc_ok(dev))
428 ndev->if_flags |= IF_READY;
429
430 ipv6_mc_init_dev(ndev);
431 ndev->tstamp = jiffies;
432 addrconf_sysctl_register(ndev);
433 /* protected by rtnl_lock */
434 rcu_assign_pointer(dev->ip6_ptr, ndev);
435
436 /* Join all-node multicast group */
437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
438
439 /* Join all-router multicast group if forwarding is set */
440 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
442
443 return ndev;
444 }
445
446 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
447 {
448 struct inet6_dev *idev;
449
450 ASSERT_RTNL();
451
452 idev = __in6_dev_get(dev);
453 if (!idev) {
454 idev = ipv6_add_dev(dev);
455 if (!idev)
456 return NULL;
457 }
458
459 if (dev->flags&IFF_UP)
460 ipv6_mc_up(idev);
461 return idev;
462 }
463
464 static int inet6_netconf_msgsize_devconf(int type)
465 {
466 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
467 + nla_total_size(4); /* NETCONFA_IFINDEX */
468
469 /* type -1 is used for ALL */
470 if (type == -1 || type == NETCONFA_FORWARDING)
471 size += nla_total_size(4);
472 if (type == -1 || type == NETCONFA_MC_FORWARDING)
473 size += nla_total_size(4);
474
475 return size;
476 }
477
478 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
479 struct ipv6_devconf *devconf, u32 portid,
480 u32 seq, int event, unsigned int flags,
481 int type)
482 {
483 struct nlmsghdr *nlh;
484 struct netconfmsg *ncm;
485
486 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
487 flags);
488 if (nlh == NULL)
489 return -EMSGSIZE;
490
491 ncm = nlmsg_data(nlh);
492 ncm->ncm_family = AF_INET6;
493
494 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
495 goto nla_put_failure;
496
497 /* type -1 is used for ALL */
498 if ((type == -1 || type == NETCONFA_FORWARDING) &&
499 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
500 goto nla_put_failure;
501 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
502 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
503 devconf->mc_forwarding) < 0)
504 goto nla_put_failure;
505
506 return nlmsg_end(skb, nlh);
507
508 nla_put_failure:
509 nlmsg_cancel(skb, nlh);
510 return -EMSGSIZE;
511 }
512
513 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
514 struct ipv6_devconf *devconf)
515 {
516 struct sk_buff *skb;
517 int err = -ENOBUFS;
518
519 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
520 if (skb == NULL)
521 goto errout;
522
523 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
524 RTM_NEWNETCONF, 0, type);
525 if (err < 0) {
526 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
527 WARN_ON(err == -EMSGSIZE);
528 kfree_skb(skb);
529 goto errout;
530 }
531 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
532 return;
533 errout:
534 if (err < 0)
535 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
536 }
537
538 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
539 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
540 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
541 };
542
543 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
544 struct nlmsghdr *nlh,
545 void *arg)
546 {
547 struct net *net = sock_net(in_skb->sk);
548 struct nlattr *tb[NETCONFA_MAX+1];
549 struct netconfmsg *ncm;
550 struct sk_buff *skb;
551 struct ipv6_devconf *devconf;
552 struct inet6_dev *in6_dev;
553 struct net_device *dev;
554 int ifindex;
555 int err;
556
557 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
558 devconf_ipv6_policy);
559 if (err < 0)
560 goto errout;
561
562 err = EINVAL;
563 if (!tb[NETCONFA_IFINDEX])
564 goto errout;
565
566 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
567 switch (ifindex) {
568 case NETCONFA_IFINDEX_ALL:
569 devconf = net->ipv6.devconf_all;
570 break;
571 case NETCONFA_IFINDEX_DEFAULT:
572 devconf = net->ipv6.devconf_dflt;
573 break;
574 default:
575 dev = __dev_get_by_index(net, ifindex);
576 if (dev == NULL)
577 goto errout;
578 in6_dev = __in6_dev_get(dev);
579 if (in6_dev == NULL)
580 goto errout;
581 devconf = &in6_dev->cnf;
582 break;
583 }
584
585 err = -ENOBUFS;
586 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
587 if (skb == NULL)
588 goto errout;
589
590 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
591 NETLINK_CB(in_skb).portid,
592 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
593 -1);
594 if (err < 0) {
595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
596 WARN_ON(err == -EMSGSIZE);
597 kfree_skb(skb);
598 goto errout;
599 }
600 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
601 errout:
602 return err;
603 }
604
605 #ifdef CONFIG_SYSCTL
606 static void dev_forward_change(struct inet6_dev *idev)
607 {
608 struct net_device *dev;
609 struct inet6_ifaddr *ifa;
610
611 if (!idev)
612 return;
613 dev = idev->dev;
614 if (idev->cnf.forwarding)
615 dev_disable_lro(dev);
616 if (dev->flags & IFF_MULTICAST) {
617 if (idev->cnf.forwarding)
618 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
619 else
620 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
621 }
622
623 list_for_each_entry(ifa, &idev->addr_list, if_list) {
624 if (ifa->flags&IFA_F_TENTATIVE)
625 continue;
626 if (idev->cnf.forwarding)
627 addrconf_join_anycast(ifa);
628 else
629 addrconf_leave_anycast(ifa);
630 }
631 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
632 dev->ifindex, &idev->cnf);
633 }
634
635
636 static void addrconf_forward_change(struct net *net, __s32 newf)
637 {
638 struct net_device *dev;
639 struct inet6_dev *idev;
640
641 for_each_netdev(net, dev) {
642 idev = __in6_dev_get(dev);
643 if (idev) {
644 int changed = (!idev->cnf.forwarding) ^ (!newf);
645 idev->cnf.forwarding = newf;
646 if (changed)
647 dev_forward_change(idev);
648 }
649 }
650 }
651
652 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
653 {
654 struct net *net;
655 int old;
656
657 if (!rtnl_trylock())
658 return restart_syscall();
659
660 net = (struct net *)table->extra2;
661 old = *p;
662 *p = newf;
663
664 if (p == &net->ipv6.devconf_dflt->forwarding) {
665 if ((!newf) ^ (!old))
666 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
667 NETCONFA_IFINDEX_DEFAULT,
668 net->ipv6.devconf_dflt);
669 rtnl_unlock();
670 return 0;
671 }
672
673 if (p == &net->ipv6.devconf_all->forwarding) {
674 net->ipv6.devconf_dflt->forwarding = newf;
675 addrconf_forward_change(net, newf);
676 if ((!newf) ^ (!old))
677 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
678 NETCONFA_IFINDEX_ALL,
679 net->ipv6.devconf_all);
680 } else if ((!newf) ^ (!old))
681 dev_forward_change((struct inet6_dev *)table->extra1);
682 rtnl_unlock();
683
684 if (newf)
685 rt6_purge_dflt_routers(net);
686 return 1;
687 }
688 #endif
689
690 /* Nobody refers to this ifaddr, destroy it */
691 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
692 {
693 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
694
695 #ifdef NET_REFCNT_DEBUG
696 pr_debug("%s\n", __func__);
697 #endif
698
699 in6_dev_put(ifp->idev);
700
701 if (del_timer(&ifp->timer))
702 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
703
704 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
705 pr_warn("Freeing alive inet6 address %p\n", ifp);
706 return;
707 }
708 ip6_rt_put(ifp->rt);
709
710 kfree_rcu(ifp, rcu);
711 }
712
713 static void
714 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
715 {
716 struct list_head *p;
717 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
718
719 /*
720 * Each device address list is sorted in order of scope -
721 * global before linklocal.
722 */
723 list_for_each(p, &idev->addr_list) {
724 struct inet6_ifaddr *ifa
725 = list_entry(p, struct inet6_ifaddr, if_list);
726 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
727 break;
728 }
729
730 list_add_tail(&ifp->if_list, p);
731 }
732
733 static u32 inet6_addr_hash(const struct in6_addr *addr)
734 {
735 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
736 }
737
738 /* On success it returns ifp with increased reference count */
739
740 static struct inet6_ifaddr *
741 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
742 int scope, u32 flags)
743 {
744 struct inet6_ifaddr *ifa = NULL;
745 struct rt6_info *rt;
746 unsigned int hash;
747 int err = 0;
748 int addr_type = ipv6_addr_type(addr);
749
750 if (addr_type == IPV6_ADDR_ANY ||
751 addr_type & IPV6_ADDR_MULTICAST ||
752 (!(idev->dev->flags & IFF_LOOPBACK) &&
753 addr_type & IPV6_ADDR_LOOPBACK))
754 return ERR_PTR(-EADDRNOTAVAIL);
755
756 rcu_read_lock_bh();
757 if (idev->dead) {
758 err = -ENODEV; /*XXX*/
759 goto out2;
760 }
761
762 if (idev->cnf.disable_ipv6) {
763 err = -EACCES;
764 goto out2;
765 }
766
767 spin_lock(&addrconf_hash_lock);
768
769 /* Ignore adding duplicate addresses on an interface */
770 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
771 ADBG(("ipv6_add_addr: already assigned\n"));
772 err = -EEXIST;
773 goto out;
774 }
775
776 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
777
778 if (ifa == NULL) {
779 ADBG(("ipv6_add_addr: malloc failed\n"));
780 err = -ENOBUFS;
781 goto out;
782 }
783
784 rt = addrconf_dst_alloc(idev, addr, false);
785 if (IS_ERR(rt)) {
786 err = PTR_ERR(rt);
787 goto out;
788 }
789
790 ifa->addr = *addr;
791
792 spin_lock_init(&ifa->lock);
793 spin_lock_init(&ifa->state_lock);
794 init_timer(&ifa->timer);
795 INIT_HLIST_NODE(&ifa->addr_lst);
796 ifa->timer.data = (unsigned long) ifa;
797 ifa->scope = scope;
798 ifa->prefix_len = pfxlen;
799 ifa->flags = flags | IFA_F_TENTATIVE;
800 ifa->cstamp = ifa->tstamp = jiffies;
801
802 ifa->rt = rt;
803
804 ifa->idev = idev;
805 in6_dev_hold(idev);
806 /* For caller */
807 in6_ifa_hold(ifa);
808
809 /* Add to big hash table */
810 hash = inet6_addr_hash(addr);
811
812 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
813 spin_unlock(&addrconf_hash_lock);
814
815 write_lock(&idev->lock);
816 /* Add to inet6_dev unicast addr list. */
817 ipv6_link_dev_addr(idev, ifa);
818
819 #ifdef CONFIG_IPV6_PRIVACY
820 if (ifa->flags&IFA_F_TEMPORARY) {
821 list_add(&ifa->tmp_list, &idev->tempaddr_list);
822 in6_ifa_hold(ifa);
823 }
824 #endif
825
826 in6_ifa_hold(ifa);
827 write_unlock(&idev->lock);
828 out2:
829 rcu_read_unlock_bh();
830
831 if (likely(err == 0))
832 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
833 else {
834 kfree(ifa);
835 ifa = ERR_PTR(err);
836 }
837
838 return ifa;
839 out:
840 spin_unlock(&addrconf_hash_lock);
841 goto out2;
842 }
843
844 /* This function wants to get referenced ifp and releases it before return */
845
846 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
847 {
848 struct inet6_ifaddr *ifa, *ifn;
849 struct inet6_dev *idev = ifp->idev;
850 int state;
851 int deleted = 0, onlink = 0;
852 unsigned long expires = jiffies;
853
854 spin_lock_bh(&ifp->state_lock);
855 state = ifp->state;
856 ifp->state = INET6_IFADDR_STATE_DEAD;
857 spin_unlock_bh(&ifp->state_lock);
858
859 if (state == INET6_IFADDR_STATE_DEAD)
860 goto out;
861
862 spin_lock_bh(&addrconf_hash_lock);
863 hlist_del_init_rcu(&ifp->addr_lst);
864 spin_unlock_bh(&addrconf_hash_lock);
865
866 write_lock_bh(&idev->lock);
867 #ifdef CONFIG_IPV6_PRIVACY
868 if (ifp->flags&IFA_F_TEMPORARY) {
869 list_del(&ifp->tmp_list);
870 if (ifp->ifpub) {
871 in6_ifa_put(ifp->ifpub);
872 ifp->ifpub = NULL;
873 }
874 __in6_ifa_put(ifp);
875 }
876 #endif
877
878 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
879 if (ifa == ifp) {
880 list_del_init(&ifp->if_list);
881 __in6_ifa_put(ifp);
882
883 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
884 break;
885 deleted = 1;
886 continue;
887 } else if (ifp->flags & IFA_F_PERMANENT) {
888 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
889 ifp->prefix_len)) {
890 if (ifa->flags & IFA_F_PERMANENT) {
891 onlink = 1;
892 if (deleted)
893 break;
894 } else {
895 unsigned long lifetime;
896
897 if (!onlink)
898 onlink = -1;
899
900 spin_lock(&ifa->lock);
901
902 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
903 /*
904 * Note: Because this address is
905 * not permanent, lifetime <
906 * LONG_MAX / HZ here.
907 */
908 if (time_before(expires,
909 ifa->tstamp + lifetime * HZ))
910 expires = ifa->tstamp + lifetime * HZ;
911 spin_unlock(&ifa->lock);
912 }
913 }
914 }
915 }
916 write_unlock_bh(&idev->lock);
917
918 addrconf_del_timer(ifp);
919
920 ipv6_ifa_notify(RTM_DELADDR, ifp);
921
922 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
923
924 /*
925 * Purge or update corresponding prefix
926 *
927 * 1) we don't purge prefix here if address was not permanent.
928 * prefix is managed by its own lifetime.
929 * 2) if there're no addresses, delete prefix.
930 * 3) if there're still other permanent address(es),
931 * corresponding prefix is still permanent.
932 * 4) otherwise, update prefix lifetime to the
933 * longest valid lifetime among the corresponding
934 * addresses on the device.
935 * Note: subsequent RA will update lifetime.
936 *
937 * --yoshfuji
938 */
939 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
940 struct in6_addr prefix;
941 struct rt6_info *rt;
942 struct net *net = dev_net(ifp->idev->dev);
943 struct flowi6 fl6 = {};
944
945 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
946 fl6.flowi6_oif = ifp->idev->dev->ifindex;
947 fl6.daddr = prefix;
948 rt = (struct rt6_info *)ip6_route_lookup(net, &fl6,
949 RT6_LOOKUP_F_IFACE);
950
951 if (rt != net->ipv6.ip6_null_entry &&
952 addrconf_is_prefix_route(rt)) {
953 if (onlink == 0) {
954 ip6_del_rt(rt);
955 rt = NULL;
956 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
957 rt6_set_expires(rt, expires);
958 }
959 }
960 ip6_rt_put(rt);
961 }
962
963 /* clean up prefsrc entries */
964 rt6_remove_prefsrc(ifp);
965 out:
966 in6_ifa_put(ifp);
967 }
968
969 #ifdef CONFIG_IPV6_PRIVACY
970 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
971 {
972 struct inet6_dev *idev = ifp->idev;
973 struct in6_addr addr, *tmpaddr;
974 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
975 unsigned long regen_advance;
976 int tmp_plen;
977 int ret = 0;
978 int max_addresses;
979 u32 addr_flags;
980 unsigned long now = jiffies;
981
982 write_lock(&idev->lock);
983 if (ift) {
984 spin_lock_bh(&ift->lock);
985 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
986 spin_unlock_bh(&ift->lock);
987 tmpaddr = &addr;
988 } else {
989 tmpaddr = NULL;
990 }
991 retry:
992 in6_dev_hold(idev);
993 if (idev->cnf.use_tempaddr <= 0) {
994 write_unlock(&idev->lock);
995 pr_info("%s: use_tempaddr is disabled\n", __func__);
996 in6_dev_put(idev);
997 ret = -1;
998 goto out;
999 }
1000 spin_lock_bh(&ifp->lock);
1001 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1002 idev->cnf.use_tempaddr = -1; /*XXX*/
1003 spin_unlock_bh(&ifp->lock);
1004 write_unlock(&idev->lock);
1005 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1006 __func__);
1007 in6_dev_put(idev);
1008 ret = -1;
1009 goto out;
1010 }
1011 in6_ifa_hold(ifp);
1012 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1013 __ipv6_try_regen_rndid(idev, tmpaddr);
1014 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1015 age = (now - ifp->tstamp) / HZ;
1016 tmp_valid_lft = min_t(__u32,
1017 ifp->valid_lft,
1018 idev->cnf.temp_valid_lft + age);
1019 tmp_prefered_lft = min_t(__u32,
1020 ifp->prefered_lft,
1021 idev->cnf.temp_prefered_lft + age -
1022 idev->cnf.max_desync_factor);
1023 tmp_plen = ifp->prefix_len;
1024 max_addresses = idev->cnf.max_addresses;
1025 tmp_tstamp = ifp->tstamp;
1026 spin_unlock_bh(&ifp->lock);
1027
1028 regen_advance = idev->cnf.regen_max_retry *
1029 idev->cnf.dad_transmits *
1030 idev->nd_parms->retrans_time / HZ;
1031 write_unlock(&idev->lock);
1032
1033 /* A temporary address is created only if this calculated Preferred
1034 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1035 * an implementation must not create a temporary address with a zero
1036 * Preferred Lifetime.
1037 */
1038 if (tmp_prefered_lft <= regen_advance) {
1039 in6_ifa_put(ifp);
1040 in6_dev_put(idev);
1041 ret = -1;
1042 goto out;
1043 }
1044
1045 addr_flags = IFA_F_TEMPORARY;
1046 /* set in addrconf_prefix_rcv() */
1047 if (ifp->flags & IFA_F_OPTIMISTIC)
1048 addr_flags |= IFA_F_OPTIMISTIC;
1049
1050 ift = !max_addresses ||
1051 ipv6_count_addresses(idev) < max_addresses ?
1052 ipv6_add_addr(idev, &addr, tmp_plen,
1053 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1054 addr_flags) : NULL;
1055 if (!ift || IS_ERR(ift)) {
1056 in6_ifa_put(ifp);
1057 in6_dev_put(idev);
1058 pr_info("%s: retry temporary address regeneration\n", __func__);
1059 tmpaddr = &addr;
1060 write_lock(&idev->lock);
1061 goto retry;
1062 }
1063
1064 spin_lock_bh(&ift->lock);
1065 ift->ifpub = ifp;
1066 ift->valid_lft = tmp_valid_lft;
1067 ift->prefered_lft = tmp_prefered_lft;
1068 ift->cstamp = now;
1069 ift->tstamp = tmp_tstamp;
1070 spin_unlock_bh(&ift->lock);
1071
1072 addrconf_dad_start(ift);
1073 in6_ifa_put(ift);
1074 in6_dev_put(idev);
1075 out:
1076 return ret;
1077 }
1078 #endif
1079
1080 /*
1081 * Choose an appropriate source address (RFC3484)
1082 */
1083 enum {
1084 IPV6_SADDR_RULE_INIT = 0,
1085 IPV6_SADDR_RULE_LOCAL,
1086 IPV6_SADDR_RULE_SCOPE,
1087 IPV6_SADDR_RULE_PREFERRED,
1088 #ifdef CONFIG_IPV6_MIP6
1089 IPV6_SADDR_RULE_HOA,
1090 #endif
1091 IPV6_SADDR_RULE_OIF,
1092 IPV6_SADDR_RULE_LABEL,
1093 #ifdef CONFIG_IPV6_PRIVACY
1094 IPV6_SADDR_RULE_PRIVACY,
1095 #endif
1096 IPV6_SADDR_RULE_ORCHID,
1097 IPV6_SADDR_RULE_PREFIX,
1098 IPV6_SADDR_RULE_MAX
1099 };
1100
1101 struct ipv6_saddr_score {
1102 int rule;
1103 int addr_type;
1104 struct inet6_ifaddr *ifa;
1105 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1106 int scopedist;
1107 int matchlen;
1108 };
1109
1110 struct ipv6_saddr_dst {
1111 const struct in6_addr *addr;
1112 int ifindex;
1113 int scope;
1114 int label;
1115 unsigned int prefs;
1116 };
1117
1118 static inline int ipv6_saddr_preferred(int type)
1119 {
1120 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1121 return 1;
1122 return 0;
1123 }
1124
1125 static int ipv6_get_saddr_eval(struct net *net,
1126 struct ipv6_saddr_score *score,
1127 struct ipv6_saddr_dst *dst,
1128 int i)
1129 {
1130 int ret;
1131
1132 if (i <= score->rule) {
1133 switch (i) {
1134 case IPV6_SADDR_RULE_SCOPE:
1135 ret = score->scopedist;
1136 break;
1137 case IPV6_SADDR_RULE_PREFIX:
1138 ret = score->matchlen;
1139 break;
1140 default:
1141 ret = !!test_bit(i, score->scorebits);
1142 }
1143 goto out;
1144 }
1145
1146 switch (i) {
1147 case IPV6_SADDR_RULE_INIT:
1148 /* Rule 0: remember if hiscore is not ready yet */
1149 ret = !!score->ifa;
1150 break;
1151 case IPV6_SADDR_RULE_LOCAL:
1152 /* Rule 1: Prefer same address */
1153 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1154 break;
1155 case IPV6_SADDR_RULE_SCOPE:
1156 /* Rule 2: Prefer appropriate scope
1157 *
1158 * ret
1159 * ^
1160 * -1 | d 15
1161 * ---+--+-+---> scope
1162 * |
1163 * | d is scope of the destination.
1164 * B-d | \
1165 * | \ <- smaller scope is better if
1166 * B-15 | \ if scope is enough for destinaion.
1167 * | ret = B - scope (-1 <= scope >= d <= 15).
1168 * d-C-1 | /
1169 * |/ <- greater is better
1170 * -C / if scope is not enough for destination.
1171 * /| ret = scope - C (-1 <= d < scope <= 15).
1172 *
1173 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1174 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1175 * Assume B = 0 and we get C > 29.
1176 */
1177 ret = __ipv6_addr_src_scope(score->addr_type);
1178 if (ret >= dst->scope)
1179 ret = -ret;
1180 else
1181 ret -= 128; /* 30 is enough */
1182 score->scopedist = ret;
1183 break;
1184 case IPV6_SADDR_RULE_PREFERRED:
1185 /* Rule 3: Avoid deprecated and optimistic addresses */
1186 ret = ipv6_saddr_preferred(score->addr_type) ||
1187 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1188 break;
1189 #ifdef CONFIG_IPV6_MIP6
1190 case IPV6_SADDR_RULE_HOA:
1191 {
1192 /* Rule 4: Prefer home address */
1193 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1194 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1195 break;
1196 }
1197 #endif
1198 case IPV6_SADDR_RULE_OIF:
1199 /* Rule 5: Prefer outgoing interface */
1200 ret = (!dst->ifindex ||
1201 dst->ifindex == score->ifa->idev->dev->ifindex);
1202 break;
1203 case IPV6_SADDR_RULE_LABEL:
1204 /* Rule 6: Prefer matching label */
1205 ret = ipv6_addr_label(net,
1206 &score->ifa->addr, score->addr_type,
1207 score->ifa->idev->dev->ifindex) == dst->label;
1208 break;
1209 #ifdef CONFIG_IPV6_PRIVACY
1210 case IPV6_SADDR_RULE_PRIVACY:
1211 {
1212 /* Rule 7: Prefer public address
1213 * Note: prefer temporary address if use_tempaddr >= 2
1214 */
1215 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1216 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1217 score->ifa->idev->cnf.use_tempaddr >= 2;
1218 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1219 break;
1220 }
1221 #endif
1222 case IPV6_SADDR_RULE_ORCHID:
1223 /* Rule 8-: Prefer ORCHID vs ORCHID or
1224 * non-ORCHID vs non-ORCHID
1225 */
1226 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1227 ipv6_addr_orchid(dst->addr));
1228 break;
1229 case IPV6_SADDR_RULE_PREFIX:
1230 /* Rule 8: Use longest matching prefix */
1231 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1232 if (ret > score->ifa->prefix_len)
1233 ret = score->ifa->prefix_len;
1234 score->matchlen = ret;
1235 break;
1236 default:
1237 ret = 0;
1238 }
1239
1240 if (ret)
1241 __set_bit(i, score->scorebits);
1242 score->rule = i;
1243 out:
1244 return ret;
1245 }
1246
1247 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1248 const struct in6_addr *daddr, unsigned int prefs,
1249 struct in6_addr *saddr)
1250 {
1251 struct ipv6_saddr_score scores[2],
1252 *score = &scores[0], *hiscore = &scores[1];
1253 struct ipv6_saddr_dst dst;
1254 struct net_device *dev;
1255 int dst_type;
1256
1257 dst_type = __ipv6_addr_type(daddr);
1258 dst.addr = daddr;
1259 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1260 dst.scope = __ipv6_addr_src_scope(dst_type);
1261 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1262 dst.prefs = prefs;
1263
1264 hiscore->rule = -1;
1265 hiscore->ifa = NULL;
1266
1267 rcu_read_lock();
1268
1269 for_each_netdev_rcu(net, dev) {
1270 struct inet6_dev *idev;
1271
1272 /* Candidate Source Address (section 4)
1273 * - multicast and link-local destination address,
1274 * the set of candidate source address MUST only
1275 * include addresses assigned to interfaces
1276 * belonging to the same link as the outgoing
1277 * interface.
1278 * (- For site-local destination addresses, the
1279 * set of candidate source addresses MUST only
1280 * include addresses assigned to interfaces
1281 * belonging to the same site as the outgoing
1282 * interface.)
1283 */
1284 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1285 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1286 dst.ifindex && dev->ifindex != dst.ifindex)
1287 continue;
1288
1289 idev = __in6_dev_get(dev);
1290 if (!idev)
1291 continue;
1292
1293 read_lock_bh(&idev->lock);
1294 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1295 int i;
1296
1297 /*
1298 * - Tentative Address (RFC2462 section 5.4)
1299 * - A tentative address is not considered
1300 * "assigned to an interface" in the traditional
1301 * sense, unless it is also flagged as optimistic.
1302 * - Candidate Source Address (section 4)
1303 * - In any case, anycast addresses, multicast
1304 * addresses, and the unspecified address MUST
1305 * NOT be included in a candidate set.
1306 */
1307 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1308 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1309 continue;
1310
1311 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1312
1313 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1314 score->addr_type & IPV6_ADDR_MULTICAST)) {
1315 LIMIT_NETDEBUG(KERN_DEBUG
1316 "ADDRCONF: unspecified / multicast address "
1317 "assigned as unicast address on %s",
1318 dev->name);
1319 continue;
1320 }
1321
1322 score->rule = -1;
1323 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1324
1325 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1326 int minihiscore, miniscore;
1327
1328 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1329 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1330
1331 if (minihiscore > miniscore) {
1332 if (i == IPV6_SADDR_RULE_SCOPE &&
1333 score->scopedist > 0) {
1334 /*
1335 * special case:
1336 * each remaining entry
1337 * has too small (not enough)
1338 * scope, because ifa entries
1339 * are sorted by their scope
1340 * values.
1341 */
1342 goto try_nextdev;
1343 }
1344 break;
1345 } else if (minihiscore < miniscore) {
1346 if (hiscore->ifa)
1347 in6_ifa_put(hiscore->ifa);
1348
1349 in6_ifa_hold(score->ifa);
1350
1351 swap(hiscore, score);
1352
1353 /* restore our iterator */
1354 score->ifa = hiscore->ifa;
1355
1356 break;
1357 }
1358 }
1359 }
1360 try_nextdev:
1361 read_unlock_bh(&idev->lock);
1362 }
1363 rcu_read_unlock();
1364
1365 if (!hiscore->ifa)
1366 return -EADDRNOTAVAIL;
1367
1368 *saddr = hiscore->ifa->addr;
1369 in6_ifa_put(hiscore->ifa);
1370 return 0;
1371 }
1372 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1373
1374 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1375 unsigned char banned_flags)
1376 {
1377 struct inet6_dev *idev;
1378 int err = -EADDRNOTAVAIL;
1379
1380 rcu_read_lock();
1381 idev = __in6_dev_get(dev);
1382 if (idev) {
1383 struct inet6_ifaddr *ifp;
1384
1385 read_lock_bh(&idev->lock);
1386 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1387 if (ifp->scope == IFA_LINK &&
1388 !(ifp->flags & banned_flags)) {
1389 *addr = ifp->addr;
1390 err = 0;
1391 break;
1392 }
1393 }
1394 read_unlock_bh(&idev->lock);
1395 }
1396 rcu_read_unlock();
1397 return err;
1398 }
1399
1400 static int ipv6_count_addresses(struct inet6_dev *idev)
1401 {
1402 int cnt = 0;
1403 struct inet6_ifaddr *ifp;
1404
1405 read_lock_bh(&idev->lock);
1406 list_for_each_entry(ifp, &idev->addr_list, if_list)
1407 cnt++;
1408 read_unlock_bh(&idev->lock);
1409 return cnt;
1410 }
1411
1412 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1413 struct net_device *dev, int strict)
1414 {
1415 struct inet6_ifaddr *ifp;
1416 struct hlist_node *node;
1417 unsigned int hash = inet6_addr_hash(addr);
1418
1419 rcu_read_lock_bh();
1420 hlist_for_each_entry_rcu(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1421 if (!net_eq(dev_net(ifp->idev->dev), net))
1422 continue;
1423 if (ipv6_addr_equal(&ifp->addr, addr) &&
1424 !(ifp->flags&IFA_F_TENTATIVE) &&
1425 (dev == NULL || ifp->idev->dev == dev ||
1426 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1427 rcu_read_unlock_bh();
1428 return 1;
1429 }
1430 }
1431
1432 rcu_read_unlock_bh();
1433 return 0;
1434 }
1435 EXPORT_SYMBOL(ipv6_chk_addr);
1436
1437 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1438 struct net_device *dev)
1439 {
1440 unsigned int hash = inet6_addr_hash(addr);
1441 struct inet6_ifaddr *ifp;
1442 struct hlist_node *node;
1443
1444 hlist_for_each_entry(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1445 if (!net_eq(dev_net(ifp->idev->dev), net))
1446 continue;
1447 if (ipv6_addr_equal(&ifp->addr, addr)) {
1448 if (dev == NULL || ifp->idev->dev == dev)
1449 return true;
1450 }
1451 }
1452 return false;
1453 }
1454
1455 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1456 {
1457 struct inet6_dev *idev;
1458 struct inet6_ifaddr *ifa;
1459 int onlink;
1460
1461 onlink = 0;
1462 rcu_read_lock();
1463 idev = __in6_dev_get(dev);
1464 if (idev) {
1465 read_lock_bh(&idev->lock);
1466 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1467 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1468 ifa->prefix_len);
1469 if (onlink)
1470 break;
1471 }
1472 read_unlock_bh(&idev->lock);
1473 }
1474 rcu_read_unlock();
1475 return onlink;
1476 }
1477 EXPORT_SYMBOL(ipv6_chk_prefix);
1478
1479 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1480 struct net_device *dev, int strict)
1481 {
1482 struct inet6_ifaddr *ifp, *result = NULL;
1483 unsigned int hash = inet6_addr_hash(addr);
1484 struct hlist_node *node;
1485
1486 rcu_read_lock_bh();
1487 hlist_for_each_entry_rcu_bh(ifp, node, &inet6_addr_lst[hash], addr_lst) {
1488 if (!net_eq(dev_net(ifp->idev->dev), net))
1489 continue;
1490 if (ipv6_addr_equal(&ifp->addr, addr)) {
1491 if (dev == NULL || ifp->idev->dev == dev ||
1492 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1493 result = ifp;
1494 in6_ifa_hold(ifp);
1495 break;
1496 }
1497 }
1498 }
1499 rcu_read_unlock_bh();
1500
1501 return result;
1502 }
1503
1504 /* Gets referenced address, destroys ifaddr */
1505
1506 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1507 {
1508 if (ifp->flags&IFA_F_PERMANENT) {
1509 spin_lock_bh(&ifp->lock);
1510 addrconf_del_timer(ifp);
1511 ifp->flags |= IFA_F_TENTATIVE;
1512 if (dad_failed)
1513 ifp->flags |= IFA_F_DADFAILED;
1514 spin_unlock_bh(&ifp->lock);
1515 if (dad_failed)
1516 ipv6_ifa_notify(0, ifp);
1517 in6_ifa_put(ifp);
1518 #ifdef CONFIG_IPV6_PRIVACY
1519 } else if (ifp->flags&IFA_F_TEMPORARY) {
1520 struct inet6_ifaddr *ifpub;
1521 spin_lock_bh(&ifp->lock);
1522 ifpub = ifp->ifpub;
1523 if (ifpub) {
1524 in6_ifa_hold(ifpub);
1525 spin_unlock_bh(&ifp->lock);
1526 ipv6_create_tempaddr(ifpub, ifp);
1527 in6_ifa_put(ifpub);
1528 } else {
1529 spin_unlock_bh(&ifp->lock);
1530 }
1531 ipv6_del_addr(ifp);
1532 #endif
1533 } else
1534 ipv6_del_addr(ifp);
1535 }
1536
1537 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1538 {
1539 int err = -ENOENT;
1540
1541 spin_lock(&ifp->state_lock);
1542 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1543 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1544 err = 0;
1545 }
1546 spin_unlock(&ifp->state_lock);
1547
1548 return err;
1549 }
1550
1551 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1552 {
1553 struct inet6_dev *idev = ifp->idev;
1554
1555 if (addrconf_dad_end(ifp)) {
1556 in6_ifa_put(ifp);
1557 return;
1558 }
1559
1560 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1561 ifp->idev->dev->name, &ifp->addr);
1562
1563 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1564 struct in6_addr addr;
1565
1566 addr.s6_addr32[0] = htonl(0xfe800000);
1567 addr.s6_addr32[1] = 0;
1568
1569 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1570 ipv6_addr_equal(&ifp->addr, &addr)) {
1571 /* DAD failed for link-local based on MAC address */
1572 idev->cnf.disable_ipv6 = 1;
1573
1574 pr_info("%s: IPv6 being disabled!\n",
1575 ifp->idev->dev->name);
1576 }
1577 }
1578
1579 addrconf_dad_stop(ifp, 1);
1580 }
1581
1582 /* Join to solicited addr multicast group. */
1583
1584 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1585 {
1586 struct in6_addr maddr;
1587
1588 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1589 return;
1590
1591 addrconf_addr_solict_mult(addr, &maddr);
1592 ipv6_dev_mc_inc(dev, &maddr);
1593 }
1594
1595 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1596 {
1597 struct in6_addr maddr;
1598
1599 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1600 return;
1601
1602 addrconf_addr_solict_mult(addr, &maddr);
1603 __ipv6_dev_mc_dec(idev, &maddr);
1604 }
1605
1606 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1607 {
1608 struct in6_addr addr;
1609 if (ifp->prefix_len == 127) /* RFC 6164 */
1610 return;
1611 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1612 if (ipv6_addr_any(&addr))
1613 return;
1614 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1615 }
1616
1617 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1618 {
1619 struct in6_addr addr;
1620 if (ifp->prefix_len == 127) /* RFC 6164 */
1621 return;
1622 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1623 if (ipv6_addr_any(&addr))
1624 return;
1625 __ipv6_dev_ac_dec(ifp->idev, &addr);
1626 }
1627
1628 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1629 {
1630 if (dev->addr_len != ETH_ALEN)
1631 return -1;
1632 memcpy(eui, dev->dev_addr, 3);
1633 memcpy(eui + 5, dev->dev_addr + 3, 3);
1634
1635 /*
1636 * The zSeries OSA network cards can be shared among various
1637 * OS instances, but the OSA cards have only one MAC address.
1638 * This leads to duplicate address conflicts in conjunction
1639 * with IPv6 if more than one instance uses the same card.
1640 *
1641 * The driver for these cards can deliver a unique 16-bit
1642 * identifier for each instance sharing the same card. It is
1643 * placed instead of 0xFFFE in the interface identifier. The
1644 * "u" bit of the interface identifier is not inverted in this
1645 * case. Hence the resulting interface identifier has local
1646 * scope according to RFC2373.
1647 */
1648 if (dev->dev_id) {
1649 eui[3] = (dev->dev_id >> 8) & 0xFF;
1650 eui[4] = dev->dev_id & 0xFF;
1651 } else {
1652 eui[3] = 0xFF;
1653 eui[4] = 0xFE;
1654 eui[0] ^= 2;
1655 }
1656 return 0;
1657 }
1658
1659 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1660 {
1661 if (dev->addr_len != IEEE802154_ADDR_LEN)
1662 return -1;
1663 memcpy(eui, dev->dev_addr, 8);
1664 return 0;
1665 }
1666
1667 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1668 {
1669 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1670 if (dev->addr_len != ARCNET_ALEN)
1671 return -1;
1672 memset(eui, 0, 7);
1673 eui[7] = *(u8 *)dev->dev_addr;
1674 return 0;
1675 }
1676
1677 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1678 {
1679 if (dev->addr_len != INFINIBAND_ALEN)
1680 return -1;
1681 memcpy(eui, dev->dev_addr + 12, 8);
1682 eui[0] |= 2;
1683 return 0;
1684 }
1685
1686 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1687 {
1688 if (addr == 0)
1689 return -1;
1690 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1691 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1692 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1693 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1694 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1695 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1696 eui[1] = 0;
1697 eui[2] = 0x5E;
1698 eui[3] = 0xFE;
1699 memcpy(eui + 4, &addr, 4);
1700 return 0;
1701 }
1702
1703 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1704 {
1705 if (dev->priv_flags & IFF_ISATAP)
1706 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1707 return -1;
1708 }
1709
1710 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1711 {
1712 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1713 }
1714
1715 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1716 {
1717 switch (dev->type) {
1718 case ARPHRD_ETHER:
1719 case ARPHRD_FDDI:
1720 return addrconf_ifid_eui48(eui, dev);
1721 case ARPHRD_ARCNET:
1722 return addrconf_ifid_arcnet(eui, dev);
1723 case ARPHRD_INFINIBAND:
1724 return addrconf_ifid_infiniband(eui, dev);
1725 case ARPHRD_SIT:
1726 return addrconf_ifid_sit(eui, dev);
1727 case ARPHRD_IPGRE:
1728 return addrconf_ifid_gre(eui, dev);
1729 case ARPHRD_IEEE802154:
1730 return addrconf_ifid_eui64(eui, dev);
1731 }
1732 return -1;
1733 }
1734
1735 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1736 {
1737 int err = -1;
1738 struct inet6_ifaddr *ifp;
1739
1740 read_lock_bh(&idev->lock);
1741 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1742 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1743 memcpy(eui, ifp->addr.s6_addr+8, 8);
1744 err = 0;
1745 break;
1746 }
1747 }
1748 read_unlock_bh(&idev->lock);
1749 return err;
1750 }
1751
1752 #ifdef CONFIG_IPV6_PRIVACY
1753 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1754 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1755 {
1756 regen:
1757 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1758 idev->rndid[0] &= ~0x02;
1759
1760 /*
1761 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1762 * check if generated address is not inappropriate
1763 *
1764 * - Reserved subnet anycast (RFC 2526)
1765 * 11111101 11....11 1xxxxxxx
1766 * - ISATAP (RFC4214) 6.1
1767 * 00-00-5E-FE-xx-xx-xx-xx
1768 * - value 0
1769 * - XXX: already assigned to an address on the device
1770 */
1771 if (idev->rndid[0] == 0xfd &&
1772 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1773 (idev->rndid[7]&0x80))
1774 goto regen;
1775 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1776 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1777 goto regen;
1778 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1779 goto regen;
1780 }
1781 }
1782
1783 static void ipv6_regen_rndid(unsigned long data)
1784 {
1785 struct inet6_dev *idev = (struct inet6_dev *) data;
1786 unsigned long expires;
1787
1788 rcu_read_lock_bh();
1789 write_lock_bh(&idev->lock);
1790
1791 if (idev->dead)
1792 goto out;
1793
1794 __ipv6_regen_rndid(idev);
1795
1796 expires = jiffies +
1797 idev->cnf.temp_prefered_lft * HZ -
1798 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1799 idev->cnf.max_desync_factor * HZ;
1800 if (time_before(expires, jiffies)) {
1801 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1802 __func__, idev->dev->name);
1803 goto out;
1804 }
1805
1806 if (!mod_timer(&idev->regen_timer, expires))
1807 in6_dev_hold(idev);
1808
1809 out:
1810 write_unlock_bh(&idev->lock);
1811 rcu_read_unlock_bh();
1812 in6_dev_put(idev);
1813 }
1814
1815 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1816 {
1817 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1818 __ipv6_regen_rndid(idev);
1819 }
1820 #endif
1821
1822 /*
1823 * Add prefix route.
1824 */
1825
1826 static void
1827 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1828 unsigned long expires, u32 flags)
1829 {
1830 struct fib6_config cfg = {
1831 .fc_table = RT6_TABLE_PREFIX,
1832 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1833 .fc_ifindex = dev->ifindex,
1834 .fc_expires = expires,
1835 .fc_dst_len = plen,
1836 .fc_flags = RTF_UP | flags,
1837 .fc_nlinfo.nl_net = dev_net(dev),
1838 .fc_protocol = RTPROT_KERNEL,
1839 };
1840
1841 cfg.fc_dst = *pfx;
1842
1843 /* Prevent useless cloning on PtP SIT.
1844 This thing is done here expecting that the whole
1845 class of non-broadcast devices need not cloning.
1846 */
1847 #if IS_ENABLED(CONFIG_IPV6_SIT)
1848 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1849 cfg.fc_flags |= RTF_NONEXTHOP;
1850 #endif
1851
1852 ip6_route_add(&cfg);
1853 }
1854
1855
1856 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1857 int plen,
1858 const struct net_device *dev,
1859 u32 flags, u32 noflags)
1860 {
1861 struct fib6_node *fn;
1862 struct rt6_info *rt = NULL;
1863 struct fib6_table *table;
1864
1865 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1866 if (table == NULL)
1867 return NULL;
1868
1869 read_lock_bh(&table->tb6_lock);
1870 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1871 if (!fn)
1872 goto out;
1873 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1874 if (rt->dst.dev->ifindex != dev->ifindex)
1875 continue;
1876 if ((rt->rt6i_flags & flags) != flags)
1877 continue;
1878 if ((noflags != 0) && ((rt->rt6i_flags & flags) != 0))
1879 continue;
1880 dst_hold(&rt->dst);
1881 break;
1882 }
1883 out:
1884 read_unlock_bh(&table->tb6_lock);
1885 return rt;
1886 }
1887
1888
1889 /* Create "default" multicast route to the interface */
1890
1891 static void addrconf_add_mroute(struct net_device *dev)
1892 {
1893 struct fib6_config cfg = {
1894 .fc_table = RT6_TABLE_LOCAL,
1895 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1896 .fc_ifindex = dev->ifindex,
1897 .fc_dst_len = 8,
1898 .fc_flags = RTF_UP,
1899 .fc_nlinfo.nl_net = dev_net(dev),
1900 };
1901
1902 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1903
1904 ip6_route_add(&cfg);
1905 }
1906
1907 #if IS_ENABLED(CONFIG_IPV6_SIT)
1908 static void sit_route_add(struct net_device *dev)
1909 {
1910 struct fib6_config cfg = {
1911 .fc_table = RT6_TABLE_MAIN,
1912 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1913 .fc_ifindex = dev->ifindex,
1914 .fc_dst_len = 96,
1915 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1916 .fc_nlinfo.nl_net = dev_net(dev),
1917 };
1918
1919 /* prefix length - 96 bits "::d.d.d.d" */
1920 ip6_route_add(&cfg);
1921 }
1922 #endif
1923
1924 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1925 {
1926 struct inet6_dev *idev;
1927
1928 ASSERT_RTNL();
1929
1930 idev = ipv6_find_idev(dev);
1931 if (!idev)
1932 return ERR_PTR(-ENOBUFS);
1933
1934 if (idev->cnf.disable_ipv6)
1935 return ERR_PTR(-EACCES);
1936
1937 /* Add default multicast route */
1938 if (!(dev->flags & IFF_LOOPBACK))
1939 addrconf_add_mroute(dev);
1940
1941 return idev;
1942 }
1943
1944 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
1945 {
1946 struct prefix_info *pinfo;
1947 __u32 valid_lft;
1948 __u32 prefered_lft;
1949 int addr_type;
1950 struct inet6_dev *in6_dev;
1951 struct net *net = dev_net(dev);
1952
1953 pinfo = (struct prefix_info *) opt;
1954
1955 if (len < sizeof(struct prefix_info)) {
1956 ADBG(("addrconf: prefix option too short\n"));
1957 return;
1958 }
1959
1960 /*
1961 * Validation checks ([ADDRCONF], page 19)
1962 */
1963
1964 addr_type = ipv6_addr_type(&pinfo->prefix);
1965
1966 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
1967 return;
1968
1969 valid_lft = ntohl(pinfo->valid);
1970 prefered_lft = ntohl(pinfo->prefered);
1971
1972 if (prefered_lft > valid_lft) {
1973 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
1974 return;
1975 }
1976
1977 in6_dev = in6_dev_get(dev);
1978
1979 if (in6_dev == NULL) {
1980 net_dbg_ratelimited("addrconf: device %s not configured\n",
1981 dev->name);
1982 return;
1983 }
1984
1985 /*
1986 * Two things going on here:
1987 * 1) Add routes for on-link prefixes
1988 * 2) Configure prefixes with the auto flag set
1989 */
1990
1991 if (pinfo->onlink) {
1992 struct rt6_info *rt;
1993 unsigned long rt_expires;
1994
1995 /* Avoid arithmetic overflow. Really, we could
1996 * save rt_expires in seconds, likely valid_lft,
1997 * but it would require division in fib gc, that it
1998 * not good.
1999 */
2000 if (HZ > USER_HZ)
2001 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2002 else
2003 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2004
2005 if (addrconf_finite_timeout(rt_expires))
2006 rt_expires *= HZ;
2007
2008 rt = addrconf_get_prefix_route(&pinfo->prefix,
2009 pinfo->prefix_len,
2010 dev,
2011 RTF_ADDRCONF | RTF_PREFIX_RT,
2012 RTF_GATEWAY | RTF_DEFAULT);
2013
2014 if (rt) {
2015 /* Autoconf prefix route */
2016 if (valid_lft == 0) {
2017 ip6_del_rt(rt);
2018 rt = NULL;
2019 } else if (addrconf_finite_timeout(rt_expires)) {
2020 /* not infinity */
2021 rt6_set_expires(rt, jiffies + rt_expires);
2022 } else {
2023 rt6_clean_expires(rt);
2024 }
2025 } else if (valid_lft) {
2026 clock_t expires = 0;
2027 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2028 if (addrconf_finite_timeout(rt_expires)) {
2029 /* not infinity */
2030 flags |= RTF_EXPIRES;
2031 expires = jiffies_to_clock_t(rt_expires);
2032 }
2033 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2034 dev, expires, flags);
2035 }
2036 ip6_rt_put(rt);
2037 }
2038
2039 /* Try to figure out our local address for this prefix */
2040
2041 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2042 struct inet6_ifaddr *ifp;
2043 struct in6_addr addr;
2044 int create = 0, update_lft = 0;
2045
2046 if (pinfo->prefix_len == 64) {
2047 memcpy(&addr, &pinfo->prefix, 8);
2048 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2049 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2050 in6_dev_put(in6_dev);
2051 return;
2052 }
2053 goto ok;
2054 }
2055 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2056 pinfo->prefix_len);
2057 in6_dev_put(in6_dev);
2058 return;
2059
2060 ok:
2061
2062 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2063
2064 if (ifp == NULL && valid_lft) {
2065 int max_addresses = in6_dev->cnf.max_addresses;
2066 u32 addr_flags = 0;
2067
2068 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2069 if (in6_dev->cnf.optimistic_dad &&
2070 !net->ipv6.devconf_all->forwarding && sllao)
2071 addr_flags = IFA_F_OPTIMISTIC;
2072 #endif
2073
2074 /* Do not allow to create too much of autoconfigured
2075 * addresses; this would be too easy way to crash kernel.
2076 */
2077 if (!max_addresses ||
2078 ipv6_count_addresses(in6_dev) < max_addresses)
2079 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
2080 addr_type&IPV6_ADDR_SCOPE_MASK,
2081 addr_flags);
2082
2083 if (!ifp || IS_ERR(ifp)) {
2084 in6_dev_put(in6_dev);
2085 return;
2086 }
2087
2088 update_lft = create = 1;
2089 ifp->cstamp = jiffies;
2090 addrconf_dad_start(ifp);
2091 }
2092
2093 if (ifp) {
2094 int flags;
2095 unsigned long now;
2096 #ifdef CONFIG_IPV6_PRIVACY
2097 struct inet6_ifaddr *ift;
2098 #endif
2099 u32 stored_lft;
2100
2101 /* update lifetime (RFC2462 5.5.3 e) */
2102 spin_lock(&ifp->lock);
2103 now = jiffies;
2104 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2105 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2106 else
2107 stored_lft = 0;
2108 if (!update_lft && stored_lft) {
2109 if (valid_lft > MIN_VALID_LIFETIME ||
2110 valid_lft > stored_lft)
2111 update_lft = 1;
2112 else if (stored_lft <= MIN_VALID_LIFETIME) {
2113 /* valid_lft <= stored_lft is always true */
2114 /*
2115 * RFC 4862 Section 5.5.3e:
2116 * "Note that the preferred lifetime of
2117 * the corresponding address is always
2118 * reset to the Preferred Lifetime in
2119 * the received Prefix Information
2120 * option, regardless of whether the
2121 * valid lifetime is also reset or
2122 * ignored."
2123 *
2124 * So if the preferred lifetime in
2125 * this advertisement is different
2126 * than what we have stored, but the
2127 * valid lifetime is invalid, just
2128 * reset prefered_lft.
2129 *
2130 * We must set the valid lifetime
2131 * to the stored lifetime since we'll
2132 * be updating the timestamp below,
2133 * else we'll set it back to the
2134 * minimum.
2135 */
2136 if (prefered_lft != ifp->prefered_lft) {
2137 valid_lft = stored_lft;
2138 update_lft = 1;
2139 }
2140 } else {
2141 valid_lft = MIN_VALID_LIFETIME;
2142 if (valid_lft < prefered_lft)
2143 prefered_lft = valid_lft;
2144 update_lft = 1;
2145 }
2146 }
2147
2148 if (update_lft) {
2149 ifp->valid_lft = valid_lft;
2150 ifp->prefered_lft = prefered_lft;
2151 ifp->tstamp = now;
2152 flags = ifp->flags;
2153 ifp->flags &= ~IFA_F_DEPRECATED;
2154 spin_unlock(&ifp->lock);
2155
2156 if (!(flags&IFA_F_TENTATIVE))
2157 ipv6_ifa_notify(0, ifp);
2158 } else
2159 spin_unlock(&ifp->lock);
2160
2161 #ifdef CONFIG_IPV6_PRIVACY
2162 read_lock_bh(&in6_dev->lock);
2163 /* update all temporary addresses in the list */
2164 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2165 tmp_list) {
2166 int age, max_valid, max_prefered;
2167
2168 if (ifp != ift->ifpub)
2169 continue;
2170
2171 /*
2172 * RFC 4941 section 3.3:
2173 * If a received option will extend the lifetime
2174 * of a public address, the lifetimes of
2175 * temporary addresses should be extended,
2176 * subject to the overall constraint that no
2177 * temporary addresses should ever remain
2178 * "valid" or "preferred" for a time longer than
2179 * (TEMP_VALID_LIFETIME) or
2180 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2181 * respectively.
2182 */
2183 age = (now - ift->cstamp) / HZ;
2184 max_valid = in6_dev->cnf.temp_valid_lft - age;
2185 if (max_valid < 0)
2186 max_valid = 0;
2187
2188 max_prefered = in6_dev->cnf.temp_prefered_lft -
2189 in6_dev->cnf.max_desync_factor -
2190 age;
2191 if (max_prefered < 0)
2192 max_prefered = 0;
2193
2194 if (valid_lft > max_valid)
2195 valid_lft = max_valid;
2196
2197 if (prefered_lft > max_prefered)
2198 prefered_lft = max_prefered;
2199
2200 spin_lock(&ift->lock);
2201 flags = ift->flags;
2202 ift->valid_lft = valid_lft;
2203 ift->prefered_lft = prefered_lft;
2204 ift->tstamp = now;
2205 if (prefered_lft > 0)
2206 ift->flags &= ~IFA_F_DEPRECATED;
2207
2208 spin_unlock(&ift->lock);
2209 if (!(flags&IFA_F_TENTATIVE))
2210 ipv6_ifa_notify(0, ift);
2211 }
2212
2213 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2214 /*
2215 * When a new public address is created as
2216 * described in [ADDRCONF], also create a new
2217 * temporary address. Also create a temporary
2218 * address if it's enabled but no temporary
2219 * address currently exists.
2220 */
2221 read_unlock_bh(&in6_dev->lock);
2222 ipv6_create_tempaddr(ifp, NULL);
2223 } else {
2224 read_unlock_bh(&in6_dev->lock);
2225 }
2226 #endif
2227 in6_ifa_put(ifp);
2228 addrconf_verify(0);
2229 }
2230 }
2231 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2232 in6_dev_put(in6_dev);
2233 }
2234
2235 /*
2236 * Set destination address.
2237 * Special case for SIT interfaces where we create a new "virtual"
2238 * device.
2239 */
2240 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2241 {
2242 struct in6_ifreq ireq;
2243 struct net_device *dev;
2244 int err = -EINVAL;
2245
2246 rtnl_lock();
2247
2248 err = -EFAULT;
2249 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2250 goto err_exit;
2251
2252 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2253
2254 err = -ENODEV;
2255 if (dev == NULL)
2256 goto err_exit;
2257
2258 #if IS_ENABLED(CONFIG_IPV6_SIT)
2259 if (dev->type == ARPHRD_SIT) {
2260 const struct net_device_ops *ops = dev->netdev_ops;
2261 struct ifreq ifr;
2262 struct ip_tunnel_parm p;
2263
2264 err = -EADDRNOTAVAIL;
2265 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2266 goto err_exit;
2267
2268 memset(&p, 0, sizeof(p));
2269 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2270 p.iph.saddr = 0;
2271 p.iph.version = 4;
2272 p.iph.ihl = 5;
2273 p.iph.protocol = IPPROTO_IPV6;
2274 p.iph.ttl = 64;
2275 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2276
2277 if (ops->ndo_do_ioctl) {
2278 mm_segment_t oldfs = get_fs();
2279
2280 set_fs(KERNEL_DS);
2281 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2282 set_fs(oldfs);
2283 } else
2284 err = -EOPNOTSUPP;
2285
2286 if (err == 0) {
2287 err = -ENOBUFS;
2288 dev = __dev_get_by_name(net, p.name);
2289 if (!dev)
2290 goto err_exit;
2291 err = dev_open(dev);
2292 }
2293 }
2294 #endif
2295
2296 err_exit:
2297 rtnl_unlock();
2298 return err;
2299 }
2300
2301 /*
2302 * Manual configuration of address on an interface
2303 */
2304 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2305 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2306 __u32 valid_lft)
2307 {
2308 struct inet6_ifaddr *ifp;
2309 struct inet6_dev *idev;
2310 struct net_device *dev;
2311 int scope;
2312 u32 flags;
2313 clock_t expires;
2314 unsigned long timeout;
2315
2316 ASSERT_RTNL();
2317
2318 if (plen > 128)
2319 return -EINVAL;
2320
2321 /* check the lifetime */
2322 if (!valid_lft || prefered_lft > valid_lft)
2323 return -EINVAL;
2324
2325 dev = __dev_get_by_index(net, ifindex);
2326 if (!dev)
2327 return -ENODEV;
2328
2329 idev = addrconf_add_dev(dev);
2330 if (IS_ERR(idev))
2331 return PTR_ERR(idev);
2332
2333 scope = ipv6_addr_scope(pfx);
2334
2335 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2336 if (addrconf_finite_timeout(timeout)) {
2337 expires = jiffies_to_clock_t(timeout * HZ);
2338 valid_lft = timeout;
2339 flags = RTF_EXPIRES;
2340 } else {
2341 expires = 0;
2342 flags = 0;
2343 ifa_flags |= IFA_F_PERMANENT;
2344 }
2345
2346 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2347 if (addrconf_finite_timeout(timeout)) {
2348 if (timeout == 0)
2349 ifa_flags |= IFA_F_DEPRECATED;
2350 prefered_lft = timeout;
2351 }
2352
2353 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2354
2355 if (!IS_ERR(ifp)) {
2356 spin_lock_bh(&ifp->lock);
2357 ifp->valid_lft = valid_lft;
2358 ifp->prefered_lft = prefered_lft;
2359 ifp->tstamp = jiffies;
2360 spin_unlock_bh(&ifp->lock);
2361
2362 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2363 expires, flags);
2364 /*
2365 * Note that section 3.1 of RFC 4429 indicates
2366 * that the Optimistic flag should not be set for
2367 * manually configured addresses
2368 */
2369 addrconf_dad_start(ifp);
2370 in6_ifa_put(ifp);
2371 addrconf_verify(0);
2372 return 0;
2373 }
2374
2375 return PTR_ERR(ifp);
2376 }
2377
2378 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2379 unsigned int plen)
2380 {
2381 struct inet6_ifaddr *ifp;
2382 struct inet6_dev *idev;
2383 struct net_device *dev;
2384
2385 if (plen > 128)
2386 return -EINVAL;
2387
2388 dev = __dev_get_by_index(net, ifindex);
2389 if (!dev)
2390 return -ENODEV;
2391
2392 if ((idev = __in6_dev_get(dev)) == NULL)
2393 return -ENXIO;
2394
2395 read_lock_bh(&idev->lock);
2396 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2397 if (ifp->prefix_len == plen &&
2398 ipv6_addr_equal(pfx, &ifp->addr)) {
2399 in6_ifa_hold(ifp);
2400 read_unlock_bh(&idev->lock);
2401
2402 ipv6_del_addr(ifp);
2403
2404 /* If the last address is deleted administratively,
2405 disable IPv6 on this interface.
2406 */
2407 if (list_empty(&idev->addr_list))
2408 addrconf_ifdown(idev->dev, 1);
2409 return 0;
2410 }
2411 }
2412 read_unlock_bh(&idev->lock);
2413 return -EADDRNOTAVAIL;
2414 }
2415
2416
2417 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2418 {
2419 struct in6_ifreq ireq;
2420 int err;
2421
2422 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2423 return -EPERM;
2424
2425 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2426 return -EFAULT;
2427
2428 rtnl_lock();
2429 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2430 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2431 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2432 rtnl_unlock();
2433 return err;
2434 }
2435
2436 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2437 {
2438 struct in6_ifreq ireq;
2439 int err;
2440
2441 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2442 return -EPERM;
2443
2444 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2445 return -EFAULT;
2446
2447 rtnl_lock();
2448 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2449 ireq.ifr6_prefixlen);
2450 rtnl_unlock();
2451 return err;
2452 }
2453
2454 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2455 int plen, int scope)
2456 {
2457 struct inet6_ifaddr *ifp;
2458
2459 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2460 if (!IS_ERR(ifp)) {
2461 spin_lock_bh(&ifp->lock);
2462 ifp->flags &= ~IFA_F_TENTATIVE;
2463 spin_unlock_bh(&ifp->lock);
2464 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2465 in6_ifa_put(ifp);
2466 }
2467 }
2468
2469 #if IS_ENABLED(CONFIG_IPV6_SIT)
2470 static void sit_add_v4_addrs(struct inet6_dev *idev)
2471 {
2472 struct in6_addr addr;
2473 struct net_device *dev;
2474 struct net *net = dev_net(idev->dev);
2475 int scope;
2476
2477 ASSERT_RTNL();
2478
2479 memset(&addr, 0, sizeof(struct in6_addr));
2480 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2481
2482 if (idev->dev->flags&IFF_POINTOPOINT) {
2483 addr.s6_addr32[0] = htonl(0xfe800000);
2484 scope = IFA_LINK;
2485 } else {
2486 scope = IPV6_ADDR_COMPATv4;
2487 }
2488
2489 if (addr.s6_addr32[3]) {
2490 add_addr(idev, &addr, 128, scope);
2491 return;
2492 }
2493
2494 for_each_netdev(net, dev) {
2495 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2496 if (in_dev && (dev->flags & IFF_UP)) {
2497 struct in_ifaddr *ifa;
2498
2499 int flag = scope;
2500
2501 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2502 int plen;
2503
2504 addr.s6_addr32[3] = ifa->ifa_local;
2505
2506 if (ifa->ifa_scope == RT_SCOPE_LINK)
2507 continue;
2508 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2509 if (idev->dev->flags&IFF_POINTOPOINT)
2510 continue;
2511 flag |= IFA_HOST;
2512 }
2513 if (idev->dev->flags&IFF_POINTOPOINT)
2514 plen = 64;
2515 else
2516 plen = 96;
2517
2518 add_addr(idev, &addr, plen, flag);
2519 }
2520 }
2521 }
2522 }
2523 #endif
2524
2525 static void init_loopback(struct net_device *dev)
2526 {
2527 struct inet6_dev *idev;
2528
2529 /* ::1 */
2530
2531 ASSERT_RTNL();
2532
2533 if ((idev = ipv6_find_idev(dev)) == NULL) {
2534 pr_debug("%s: add_dev failed\n", __func__);
2535 return;
2536 }
2537
2538 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2539 }
2540
2541 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2542 {
2543 struct inet6_ifaddr *ifp;
2544 u32 addr_flags = IFA_F_PERMANENT;
2545
2546 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2547 if (idev->cnf.optimistic_dad &&
2548 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2549 addr_flags |= IFA_F_OPTIMISTIC;
2550 #endif
2551
2552
2553 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2554 if (!IS_ERR(ifp)) {
2555 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2556 addrconf_dad_start(ifp);
2557 in6_ifa_put(ifp);
2558 }
2559 }
2560
2561 static void addrconf_dev_config(struct net_device *dev)
2562 {
2563 struct in6_addr addr;
2564 struct inet6_dev *idev;
2565
2566 ASSERT_RTNL();
2567
2568 if ((dev->type != ARPHRD_ETHER) &&
2569 (dev->type != ARPHRD_FDDI) &&
2570 (dev->type != ARPHRD_ARCNET) &&
2571 (dev->type != ARPHRD_INFINIBAND) &&
2572 (dev->type != ARPHRD_IEEE802154)) {
2573 /* Alas, we support only Ethernet autoconfiguration. */
2574 return;
2575 }
2576
2577 idev = addrconf_add_dev(dev);
2578 if (IS_ERR(idev))
2579 return;
2580
2581 memset(&addr, 0, sizeof(struct in6_addr));
2582 addr.s6_addr32[0] = htonl(0xFE800000);
2583
2584 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2585 addrconf_add_linklocal(idev, &addr);
2586 }
2587
2588 #if IS_ENABLED(CONFIG_IPV6_SIT)
2589 static void addrconf_sit_config(struct net_device *dev)
2590 {
2591 struct inet6_dev *idev;
2592
2593 ASSERT_RTNL();
2594
2595 /*
2596 * Configure the tunnel with one of our IPv4
2597 * addresses... we should configure all of
2598 * our v4 addrs in the tunnel
2599 */
2600
2601 if ((idev = ipv6_find_idev(dev)) == NULL) {
2602 pr_debug("%s: add_dev failed\n", __func__);
2603 return;
2604 }
2605
2606 if (dev->priv_flags & IFF_ISATAP) {
2607 struct in6_addr addr;
2608
2609 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2610 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2611 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2612 addrconf_add_linklocal(idev, &addr);
2613 return;
2614 }
2615
2616 sit_add_v4_addrs(idev);
2617
2618 if (dev->flags&IFF_POINTOPOINT)
2619 addrconf_add_mroute(dev);
2620 else
2621 sit_route_add(dev);
2622 }
2623 #endif
2624
2625 #if IS_ENABLED(CONFIG_NET_IPGRE)
2626 static void addrconf_gre_config(struct net_device *dev)
2627 {
2628 struct inet6_dev *idev;
2629 struct in6_addr addr;
2630
2631 pr_info("%s(%s)\n", __func__, dev->name);
2632
2633 ASSERT_RTNL();
2634
2635 if ((idev = ipv6_find_idev(dev)) == NULL) {
2636 pr_debug("%s: add_dev failed\n", __func__);
2637 return;
2638 }
2639
2640 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2641 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2642
2643 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2644 addrconf_add_linklocal(idev, &addr);
2645 }
2646 #endif
2647
2648 static inline int
2649 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2650 {
2651 struct in6_addr lladdr;
2652
2653 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2654 addrconf_add_linklocal(idev, &lladdr);
2655 return 0;
2656 }
2657 return -1;
2658 }
2659
2660 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2661 {
2662 struct net_device *link_dev;
2663 struct net *net = dev_net(idev->dev);
2664
2665 /* first try to inherit the link-local address from the link device */
2666 if (idev->dev->iflink &&
2667 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2668 if (!ipv6_inherit_linklocal(idev, link_dev))
2669 return;
2670 }
2671 /* then try to inherit it from any device */
2672 for_each_netdev(net, link_dev) {
2673 if (!ipv6_inherit_linklocal(idev, link_dev))
2674 return;
2675 }
2676 pr_debug("init ip6-ip6: add_linklocal failed\n");
2677 }
2678
2679 /*
2680 * Autoconfigure tunnel with a link-local address so routing protocols,
2681 * DHCPv6, MLD etc. can be run over the virtual link
2682 */
2683
2684 static void addrconf_ip6_tnl_config(struct net_device *dev)
2685 {
2686 struct inet6_dev *idev;
2687
2688 ASSERT_RTNL();
2689
2690 idev = addrconf_add_dev(dev);
2691 if (IS_ERR(idev)) {
2692 pr_debug("init ip6-ip6: add_dev failed\n");
2693 return;
2694 }
2695 ip6_tnl_add_linklocal(idev);
2696 }
2697
2698 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2699 void *data)
2700 {
2701 struct net_device *dev = (struct net_device *) data;
2702 struct inet6_dev *idev = __in6_dev_get(dev);
2703 int run_pending = 0;
2704 int err;
2705
2706 switch (event) {
2707 case NETDEV_REGISTER:
2708 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2709 idev = ipv6_add_dev(dev);
2710 if (!idev)
2711 return notifier_from_errno(-ENOMEM);
2712 }
2713 break;
2714
2715 case NETDEV_UP:
2716 case NETDEV_CHANGE:
2717 if (dev->flags & IFF_SLAVE)
2718 break;
2719
2720 if (event == NETDEV_UP) {
2721 if (!addrconf_qdisc_ok(dev)) {
2722 /* device is not ready yet. */
2723 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2724 dev->name);
2725 break;
2726 }
2727
2728 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2729 idev = ipv6_add_dev(dev);
2730
2731 if (idev) {
2732 idev->if_flags |= IF_READY;
2733 run_pending = 1;
2734 }
2735 } else {
2736 if (!addrconf_qdisc_ok(dev)) {
2737 /* device is still not ready. */
2738 break;
2739 }
2740
2741 if (idev) {
2742 if (idev->if_flags & IF_READY)
2743 /* device is already configured. */
2744 break;
2745 idev->if_flags |= IF_READY;
2746 }
2747
2748 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2749 dev->name);
2750
2751 run_pending = 1;
2752 }
2753
2754 switch (dev->type) {
2755 #if IS_ENABLED(CONFIG_IPV6_SIT)
2756 case ARPHRD_SIT:
2757 addrconf_sit_config(dev);
2758 break;
2759 #endif
2760 #if IS_ENABLED(CONFIG_NET_IPGRE)
2761 case ARPHRD_IPGRE:
2762 addrconf_gre_config(dev);
2763 break;
2764 #endif
2765 case ARPHRD_TUNNEL6:
2766 addrconf_ip6_tnl_config(dev);
2767 break;
2768 case ARPHRD_LOOPBACK:
2769 init_loopback(dev);
2770 break;
2771
2772 default:
2773 addrconf_dev_config(dev);
2774 break;
2775 }
2776
2777 if (idev) {
2778 if (run_pending)
2779 addrconf_dad_run(idev);
2780
2781 /*
2782 * If the MTU changed during the interface down,
2783 * when the interface up, the changed MTU must be
2784 * reflected in the idev as well as routers.
2785 */
2786 if (idev->cnf.mtu6 != dev->mtu &&
2787 dev->mtu >= IPV6_MIN_MTU) {
2788 rt6_mtu_change(dev, dev->mtu);
2789 idev->cnf.mtu6 = dev->mtu;
2790 }
2791 idev->tstamp = jiffies;
2792 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2793
2794 /*
2795 * If the changed mtu during down is lower than
2796 * IPV6_MIN_MTU stop IPv6 on this interface.
2797 */
2798 if (dev->mtu < IPV6_MIN_MTU)
2799 addrconf_ifdown(dev, 1);
2800 }
2801 break;
2802
2803 case NETDEV_CHANGEMTU:
2804 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2805 rt6_mtu_change(dev, dev->mtu);
2806 idev->cnf.mtu6 = dev->mtu;
2807 break;
2808 }
2809
2810 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2811 idev = ipv6_add_dev(dev);
2812 if (idev)
2813 break;
2814 }
2815
2816 /*
2817 * MTU falled under IPV6_MIN_MTU.
2818 * Stop IPv6 on this interface.
2819 */
2820
2821 case NETDEV_DOWN:
2822 case NETDEV_UNREGISTER:
2823 /*
2824 * Remove all addresses from this interface.
2825 */
2826 addrconf_ifdown(dev, event != NETDEV_DOWN);
2827 break;
2828
2829 case NETDEV_CHANGENAME:
2830 if (idev) {
2831 snmp6_unregister_dev(idev);
2832 addrconf_sysctl_unregister(idev);
2833 addrconf_sysctl_register(idev);
2834 err = snmp6_register_dev(idev);
2835 if (err)
2836 return notifier_from_errno(err);
2837 }
2838 break;
2839
2840 case NETDEV_PRE_TYPE_CHANGE:
2841 case NETDEV_POST_TYPE_CHANGE:
2842 addrconf_type_change(dev, event);
2843 break;
2844 }
2845
2846 return NOTIFY_OK;
2847 }
2848
2849 /*
2850 * addrconf module should be notified of a device going up
2851 */
2852 static struct notifier_block ipv6_dev_notf = {
2853 .notifier_call = addrconf_notify,
2854 };
2855
2856 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2857 {
2858 struct inet6_dev *idev;
2859 ASSERT_RTNL();
2860
2861 idev = __in6_dev_get(dev);
2862
2863 if (event == NETDEV_POST_TYPE_CHANGE)
2864 ipv6_mc_remap(idev);
2865 else if (event == NETDEV_PRE_TYPE_CHANGE)
2866 ipv6_mc_unmap(idev);
2867 }
2868
2869 static int addrconf_ifdown(struct net_device *dev, int how)
2870 {
2871 struct net *net = dev_net(dev);
2872 struct inet6_dev *idev;
2873 struct inet6_ifaddr *ifa;
2874 int state, i;
2875
2876 ASSERT_RTNL();
2877
2878 rt6_ifdown(net, dev);
2879 neigh_ifdown(&nd_tbl, dev);
2880
2881 idev = __in6_dev_get(dev);
2882 if (idev == NULL)
2883 return -ENODEV;
2884
2885 /*
2886 * Step 1: remove reference to ipv6 device from parent device.
2887 * Do not dev_put!
2888 */
2889 if (how) {
2890 idev->dead = 1;
2891
2892 /* protected by rtnl_lock */
2893 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2894
2895 /* Step 1.5: remove snmp6 entry */
2896 snmp6_unregister_dev(idev);
2897
2898 }
2899
2900 /* Step 2: clear hash table */
2901 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2902 struct hlist_head *h = &inet6_addr_lst[i];
2903 struct hlist_node *n;
2904
2905 spin_lock_bh(&addrconf_hash_lock);
2906 restart:
2907 hlist_for_each_entry_rcu(ifa, n, h, addr_lst) {
2908 if (ifa->idev == idev) {
2909 hlist_del_init_rcu(&ifa->addr_lst);
2910 addrconf_del_timer(ifa);
2911 goto restart;
2912 }
2913 }
2914 spin_unlock_bh(&addrconf_hash_lock);
2915 }
2916
2917 write_lock_bh(&idev->lock);
2918
2919 /* Step 2: clear flags for stateless addrconf */
2920 if (!how)
2921 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2922
2923 #ifdef CONFIG_IPV6_PRIVACY
2924 if (how && del_timer(&idev->regen_timer))
2925 in6_dev_put(idev);
2926
2927 /* Step 3: clear tempaddr list */
2928 while (!list_empty(&idev->tempaddr_list)) {
2929 ifa = list_first_entry(&idev->tempaddr_list,
2930 struct inet6_ifaddr, tmp_list);
2931 list_del(&ifa->tmp_list);
2932 write_unlock_bh(&idev->lock);
2933 spin_lock_bh(&ifa->lock);
2934
2935 if (ifa->ifpub) {
2936 in6_ifa_put(ifa->ifpub);
2937 ifa->ifpub = NULL;
2938 }
2939 spin_unlock_bh(&ifa->lock);
2940 in6_ifa_put(ifa);
2941 write_lock_bh(&idev->lock);
2942 }
2943 #endif
2944
2945 while (!list_empty(&idev->addr_list)) {
2946 ifa = list_first_entry(&idev->addr_list,
2947 struct inet6_ifaddr, if_list);
2948 addrconf_del_timer(ifa);
2949
2950 list_del(&ifa->if_list);
2951
2952 write_unlock_bh(&idev->lock);
2953
2954 spin_lock_bh(&ifa->state_lock);
2955 state = ifa->state;
2956 ifa->state = INET6_IFADDR_STATE_DEAD;
2957 spin_unlock_bh(&ifa->state_lock);
2958
2959 if (state != INET6_IFADDR_STATE_DEAD) {
2960 __ipv6_ifa_notify(RTM_DELADDR, ifa);
2961 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
2962 }
2963 in6_ifa_put(ifa);
2964
2965 write_lock_bh(&idev->lock);
2966 }
2967
2968 write_unlock_bh(&idev->lock);
2969
2970 /* Step 5: Discard multicast list */
2971 if (how)
2972 ipv6_mc_destroy_dev(idev);
2973 else
2974 ipv6_mc_down(idev);
2975
2976 idev->tstamp = jiffies;
2977
2978 /* Last: Shot the device (if unregistered) */
2979 if (how) {
2980 addrconf_sysctl_unregister(idev);
2981 neigh_parms_release(&nd_tbl, idev->nd_parms);
2982 neigh_ifdown(&nd_tbl, dev);
2983 in6_dev_put(idev);
2984 }
2985 return 0;
2986 }
2987
2988 static void addrconf_rs_timer(unsigned long data)
2989 {
2990 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
2991 struct inet6_dev *idev = ifp->idev;
2992
2993 read_lock(&idev->lock);
2994 if (idev->dead || !(idev->if_flags & IF_READY))
2995 goto out;
2996
2997 if (!ipv6_accept_ra(idev))
2998 goto out;
2999
3000 /* Announcement received after solicitation was sent */
3001 if (idev->if_flags & IF_RA_RCVD)
3002 goto out;
3003
3004 spin_lock(&ifp->lock);
3005 if (ifp->probes++ < idev->cnf.rtr_solicits) {
3006 /* The wait after the last probe can be shorter */
3007 addrconf_mod_timer(ifp, AC_RS,
3008 (ifp->probes == idev->cnf.rtr_solicits) ?
3009 idev->cnf.rtr_solicit_delay :
3010 idev->cnf.rtr_solicit_interval);
3011 spin_unlock(&ifp->lock);
3012
3013 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3014 } else {
3015 spin_unlock(&ifp->lock);
3016 /*
3017 * Note: we do not support deprecated "all on-link"
3018 * assumption any longer.
3019 */
3020 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3021 }
3022
3023 out:
3024 read_unlock(&idev->lock);
3025 in6_ifa_put(ifp);
3026 }
3027
3028 /*
3029 * Duplicate Address Detection
3030 */
3031 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3032 {
3033 unsigned long rand_num;
3034 struct inet6_dev *idev = ifp->idev;
3035
3036 if (ifp->flags & IFA_F_OPTIMISTIC)
3037 rand_num = 0;
3038 else
3039 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3040
3041 ifp->probes = idev->cnf.dad_transmits;
3042 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3043 }
3044
3045 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3046 {
3047 struct inet6_dev *idev = ifp->idev;
3048 struct net_device *dev = idev->dev;
3049
3050 addrconf_join_solict(dev, &ifp->addr);
3051
3052 net_srandom(ifp->addr.s6_addr32[3]);
3053
3054 read_lock_bh(&idev->lock);
3055 spin_lock(&ifp->lock);
3056 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3057 goto out;
3058
3059 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3060 idev->cnf.accept_dad < 1 ||
3061 !(ifp->flags&IFA_F_TENTATIVE) ||
3062 ifp->flags & IFA_F_NODAD) {
3063 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3064 spin_unlock(&ifp->lock);
3065 read_unlock_bh(&idev->lock);
3066
3067 addrconf_dad_completed(ifp);
3068 return;
3069 }
3070
3071 if (!(idev->if_flags & IF_READY)) {
3072 spin_unlock(&ifp->lock);
3073 read_unlock_bh(&idev->lock);
3074 /*
3075 * If the device is not ready:
3076 * - keep it tentative if it is a permanent address.
3077 * - otherwise, kill it.
3078 */
3079 in6_ifa_hold(ifp);
3080 addrconf_dad_stop(ifp, 0);
3081 return;
3082 }
3083
3084 /*
3085 * Optimistic nodes can start receiving
3086 * Frames right away
3087 */
3088 if (ifp->flags & IFA_F_OPTIMISTIC)
3089 ip6_ins_rt(ifp->rt);
3090
3091 addrconf_dad_kick(ifp);
3092 out:
3093 spin_unlock(&ifp->lock);
3094 read_unlock_bh(&idev->lock);
3095 }
3096
3097 static void addrconf_dad_timer(unsigned long data)
3098 {
3099 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3100 struct inet6_dev *idev = ifp->idev;
3101 struct in6_addr mcaddr;
3102
3103 if (!ifp->probes && addrconf_dad_end(ifp))
3104 goto out;
3105
3106 read_lock(&idev->lock);
3107 if (idev->dead || !(idev->if_flags & IF_READY)) {
3108 read_unlock(&idev->lock);
3109 goto out;
3110 }
3111
3112 spin_lock(&ifp->lock);
3113 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3114 spin_unlock(&ifp->lock);
3115 read_unlock(&idev->lock);
3116 goto out;
3117 }
3118
3119 if (ifp->probes == 0) {
3120 /*
3121 * DAD was successful
3122 */
3123
3124 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3125 spin_unlock(&ifp->lock);
3126 read_unlock(&idev->lock);
3127
3128 addrconf_dad_completed(ifp);
3129
3130 goto out;
3131 }
3132
3133 ifp->probes--;
3134 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3135 spin_unlock(&ifp->lock);
3136 read_unlock(&idev->lock);
3137
3138 /* send a neighbour solicitation for our addr */
3139 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3140 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3141 out:
3142 in6_ifa_put(ifp);
3143 }
3144
3145 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3146 {
3147 struct net_device *dev = ifp->idev->dev;
3148
3149 /*
3150 * Configure the address for reception. Now it is valid.
3151 */
3152
3153 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3154
3155 /* If added prefix is link local and we are prepared to process
3156 router advertisements, start sending router solicitations.
3157 */
3158
3159 if (ipv6_accept_ra(ifp->idev) &&
3160 ifp->idev->cnf.rtr_solicits > 0 &&
3161 (dev->flags&IFF_LOOPBACK) == 0 &&
3162 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3163 /*
3164 * If a host as already performed a random delay
3165 * [...] as part of DAD [...] there is no need
3166 * to delay again before sending the first RS
3167 */
3168 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3169
3170 spin_lock_bh(&ifp->lock);
3171 ifp->probes = 1;
3172 ifp->idev->if_flags |= IF_RS_SENT;
3173 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3174 spin_unlock_bh(&ifp->lock);
3175 }
3176 }
3177
3178 static void addrconf_dad_run(struct inet6_dev *idev)
3179 {
3180 struct inet6_ifaddr *ifp;
3181
3182 read_lock_bh(&idev->lock);
3183 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3184 spin_lock(&ifp->lock);
3185 if (ifp->flags & IFA_F_TENTATIVE &&
3186 ifp->state == INET6_IFADDR_STATE_DAD)
3187 addrconf_dad_kick(ifp);
3188 spin_unlock(&ifp->lock);
3189 }
3190 read_unlock_bh(&idev->lock);
3191 }
3192
3193 #ifdef CONFIG_PROC_FS
3194 struct if6_iter_state {
3195 struct seq_net_private p;
3196 int bucket;
3197 int offset;
3198 };
3199
3200 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3201 {
3202 struct inet6_ifaddr *ifa = NULL;
3203 struct if6_iter_state *state = seq->private;
3204 struct net *net = seq_file_net(seq);
3205 int p = 0;
3206
3207 /* initial bucket if pos is 0 */
3208 if (pos == 0) {
3209 state->bucket = 0;
3210 state->offset = 0;
3211 }
3212
3213 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3214 struct hlist_node *n;
3215 hlist_for_each_entry_rcu_bh(ifa, n, &inet6_addr_lst[state->bucket],
3216 addr_lst) {
3217 if (!net_eq(dev_net(ifa->idev->dev), net))
3218 continue;
3219 /* sync with offset */
3220 if (p < state->offset) {
3221 p++;
3222 continue;
3223 }
3224 state->offset++;
3225 return ifa;
3226 }
3227
3228 /* prepare for next bucket */
3229 state->offset = 0;
3230 p = 0;
3231 }
3232 return NULL;
3233 }
3234
3235 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3236 struct inet6_ifaddr *ifa)
3237 {
3238 struct if6_iter_state *state = seq->private;
3239 struct net *net = seq_file_net(seq);
3240 struct hlist_node *n = &ifa->addr_lst;
3241
3242 hlist_for_each_entry_continue_rcu_bh(ifa, n, addr_lst) {
3243 if (!net_eq(dev_net(ifa->idev->dev), net))
3244 continue;
3245 state->offset++;
3246 return ifa;
3247 }
3248
3249 while (++state->bucket < IN6_ADDR_HSIZE) {
3250 state->offset = 0;
3251 hlist_for_each_entry_rcu_bh(ifa, n,
3252 &inet6_addr_lst[state->bucket], addr_lst) {
3253 if (!net_eq(dev_net(ifa->idev->dev), net))
3254 continue;
3255 state->offset++;
3256 return ifa;
3257 }
3258 }
3259
3260 return NULL;
3261 }
3262
3263 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3264 __acquires(rcu_bh)
3265 {
3266 rcu_read_lock_bh();
3267 return if6_get_first(seq, *pos);
3268 }
3269
3270 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3271 {
3272 struct inet6_ifaddr *ifa;
3273
3274 ifa = if6_get_next(seq, v);
3275 ++*pos;
3276 return ifa;
3277 }
3278
3279 static void if6_seq_stop(struct seq_file *seq, void *v)
3280 __releases(rcu_bh)
3281 {
3282 rcu_read_unlock_bh();
3283 }
3284
3285 static int if6_seq_show(struct seq_file *seq, void *v)
3286 {
3287 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3288 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3289 &ifp->addr,
3290 ifp->idev->dev->ifindex,
3291 ifp->prefix_len,
3292 ifp->scope,
3293 ifp->flags,
3294 ifp->idev->dev->name);
3295 return 0;
3296 }
3297
3298 static const struct seq_operations if6_seq_ops = {
3299 .start = if6_seq_start,
3300 .next = if6_seq_next,
3301 .show = if6_seq_show,
3302 .stop = if6_seq_stop,
3303 };
3304
3305 static int if6_seq_open(struct inode *inode, struct file *file)
3306 {
3307 return seq_open_net(inode, file, &if6_seq_ops,
3308 sizeof(struct if6_iter_state));
3309 }
3310
3311 static const struct file_operations if6_fops = {
3312 .owner = THIS_MODULE,
3313 .open = if6_seq_open,
3314 .read = seq_read,
3315 .llseek = seq_lseek,
3316 .release = seq_release_net,
3317 };
3318
3319 static int __net_init if6_proc_net_init(struct net *net)
3320 {
3321 if (!proc_net_fops_create(net, "if_inet6", S_IRUGO, &if6_fops))
3322 return -ENOMEM;
3323 return 0;
3324 }
3325
3326 static void __net_exit if6_proc_net_exit(struct net *net)
3327 {
3328 proc_net_remove(net, "if_inet6");
3329 }
3330
3331 static struct pernet_operations if6_proc_net_ops = {
3332 .init = if6_proc_net_init,
3333 .exit = if6_proc_net_exit,
3334 };
3335
3336 int __init if6_proc_init(void)
3337 {
3338 return register_pernet_subsys(&if6_proc_net_ops);
3339 }
3340
3341 void if6_proc_exit(void)
3342 {
3343 unregister_pernet_subsys(&if6_proc_net_ops);
3344 }
3345 #endif /* CONFIG_PROC_FS */
3346
3347 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3348 /* Check if address is a home address configured on any interface. */
3349 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3350 {
3351 int ret = 0;
3352 struct inet6_ifaddr *ifp = NULL;
3353 struct hlist_node *n;
3354 unsigned int hash = inet6_addr_hash(addr);
3355
3356 rcu_read_lock_bh();
3357 hlist_for_each_entry_rcu_bh(ifp, n, &inet6_addr_lst[hash], addr_lst) {
3358 if (!net_eq(dev_net(ifp->idev->dev), net))
3359 continue;
3360 if (ipv6_addr_equal(&ifp->addr, addr) &&
3361 (ifp->flags & IFA_F_HOMEADDRESS)) {
3362 ret = 1;
3363 break;
3364 }
3365 }
3366 rcu_read_unlock_bh();
3367 return ret;
3368 }
3369 #endif
3370
3371 /*
3372 * Periodic address status verification
3373 */
3374
3375 static void addrconf_verify(unsigned long foo)
3376 {
3377 unsigned long now, next, next_sec, next_sched;
3378 struct inet6_ifaddr *ifp;
3379 struct hlist_node *node;
3380 int i;
3381
3382 rcu_read_lock_bh();
3383 spin_lock(&addrconf_verify_lock);
3384 now = jiffies;
3385 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3386
3387 del_timer(&addr_chk_timer);
3388
3389 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3390 restart:
3391 hlist_for_each_entry_rcu_bh(ifp, node,
3392 &inet6_addr_lst[i], addr_lst) {
3393 unsigned long age;
3394
3395 if (ifp->flags & IFA_F_PERMANENT)
3396 continue;
3397
3398 spin_lock(&ifp->lock);
3399 /* We try to batch several events at once. */
3400 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3401
3402 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3403 age >= ifp->valid_lft) {
3404 spin_unlock(&ifp->lock);
3405 in6_ifa_hold(ifp);
3406 ipv6_del_addr(ifp);
3407 goto restart;
3408 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3409 spin_unlock(&ifp->lock);
3410 continue;
3411 } else if (age >= ifp->prefered_lft) {
3412 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3413 int deprecate = 0;
3414
3415 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3416 deprecate = 1;
3417 ifp->flags |= IFA_F_DEPRECATED;
3418 }
3419
3420 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3421 next = ifp->tstamp + ifp->valid_lft * HZ;
3422
3423 spin_unlock(&ifp->lock);
3424
3425 if (deprecate) {
3426 in6_ifa_hold(ifp);
3427
3428 ipv6_ifa_notify(0, ifp);
3429 in6_ifa_put(ifp);
3430 goto restart;
3431 }
3432 #ifdef CONFIG_IPV6_PRIVACY
3433 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3434 !(ifp->flags&IFA_F_TENTATIVE)) {
3435 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3436 ifp->idev->cnf.dad_transmits *
3437 ifp->idev->nd_parms->retrans_time / HZ;
3438
3439 if (age >= ifp->prefered_lft - regen_advance) {
3440 struct inet6_ifaddr *ifpub = ifp->ifpub;
3441 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3442 next = ifp->tstamp + ifp->prefered_lft * HZ;
3443 if (!ifp->regen_count && ifpub) {
3444 ifp->regen_count++;
3445 in6_ifa_hold(ifp);
3446 in6_ifa_hold(ifpub);
3447 spin_unlock(&ifp->lock);
3448
3449 spin_lock(&ifpub->lock);
3450 ifpub->regen_count = 0;
3451 spin_unlock(&ifpub->lock);
3452 ipv6_create_tempaddr(ifpub, ifp);
3453 in6_ifa_put(ifpub);
3454 in6_ifa_put(ifp);
3455 goto restart;
3456 }
3457 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3458 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3459 spin_unlock(&ifp->lock);
3460 #endif
3461 } else {
3462 /* ifp->prefered_lft <= ifp->valid_lft */
3463 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3464 next = ifp->tstamp + ifp->prefered_lft * HZ;
3465 spin_unlock(&ifp->lock);
3466 }
3467 }
3468 }
3469
3470 next_sec = round_jiffies_up(next);
3471 next_sched = next;
3472
3473 /* If rounded timeout is accurate enough, accept it. */
3474 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3475 next_sched = next_sec;
3476
3477 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3478 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3479 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3480
3481 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3482 now, next, next_sec, next_sched));
3483
3484 addr_chk_timer.expires = next_sched;
3485 add_timer(&addr_chk_timer);
3486 spin_unlock(&addrconf_verify_lock);
3487 rcu_read_unlock_bh();
3488 }
3489
3490 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3491 {
3492 struct in6_addr *pfx = NULL;
3493
3494 if (addr)
3495 pfx = nla_data(addr);
3496
3497 if (local) {
3498 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3499 pfx = NULL;
3500 else
3501 pfx = nla_data(local);
3502 }
3503
3504 return pfx;
3505 }
3506
3507 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3508 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3509 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3510 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3511 };
3512
3513 static int
3514 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3515 {
3516 struct net *net = sock_net(skb->sk);
3517 struct ifaddrmsg *ifm;
3518 struct nlattr *tb[IFA_MAX+1];
3519 struct in6_addr *pfx;
3520 int err;
3521
3522 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3523 if (err < 0)
3524 return err;
3525
3526 ifm = nlmsg_data(nlh);
3527 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3528 if (pfx == NULL)
3529 return -EINVAL;
3530
3531 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3532 }
3533
3534 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3535 u32 prefered_lft, u32 valid_lft)
3536 {
3537 u32 flags;
3538 clock_t expires;
3539 unsigned long timeout;
3540
3541 if (!valid_lft || (prefered_lft > valid_lft))
3542 return -EINVAL;
3543
3544 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3545 if (addrconf_finite_timeout(timeout)) {
3546 expires = jiffies_to_clock_t(timeout * HZ);
3547 valid_lft = timeout;
3548 flags = RTF_EXPIRES;
3549 } else {
3550 expires = 0;
3551 flags = 0;
3552 ifa_flags |= IFA_F_PERMANENT;
3553 }
3554
3555 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3556 if (addrconf_finite_timeout(timeout)) {
3557 if (timeout == 0)
3558 ifa_flags |= IFA_F_DEPRECATED;
3559 prefered_lft = timeout;
3560 }
3561
3562 spin_lock_bh(&ifp->lock);
3563 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3564 ifp->tstamp = jiffies;
3565 ifp->valid_lft = valid_lft;
3566 ifp->prefered_lft = prefered_lft;
3567
3568 spin_unlock_bh(&ifp->lock);
3569 if (!(ifp->flags&IFA_F_TENTATIVE))
3570 ipv6_ifa_notify(0, ifp);
3571
3572 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3573 expires, flags);
3574 addrconf_verify(0);
3575
3576 return 0;
3577 }
3578
3579 static int
3580 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
3581 {
3582 struct net *net = sock_net(skb->sk);
3583 struct ifaddrmsg *ifm;
3584 struct nlattr *tb[IFA_MAX+1];
3585 struct in6_addr *pfx;
3586 struct inet6_ifaddr *ifa;
3587 struct net_device *dev;
3588 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3589 u8 ifa_flags;
3590 int err;
3591
3592 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3593 if (err < 0)
3594 return err;
3595
3596 ifm = nlmsg_data(nlh);
3597 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3598 if (pfx == NULL)
3599 return -EINVAL;
3600
3601 if (tb[IFA_CACHEINFO]) {
3602 struct ifa_cacheinfo *ci;
3603
3604 ci = nla_data(tb[IFA_CACHEINFO]);
3605 valid_lft = ci->ifa_valid;
3606 preferred_lft = ci->ifa_prefered;
3607 } else {
3608 preferred_lft = INFINITY_LIFE_TIME;
3609 valid_lft = INFINITY_LIFE_TIME;
3610 }
3611
3612 dev = __dev_get_by_index(net, ifm->ifa_index);
3613 if (dev == NULL)
3614 return -ENODEV;
3615
3616 /* We ignore other flags so far. */
3617 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3618
3619 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3620 if (ifa == NULL) {
3621 /*
3622 * It would be best to check for !NLM_F_CREATE here but
3623 * userspace alreay relies on not having to provide this.
3624 */
3625 return inet6_addr_add(net, ifm->ifa_index, pfx,
3626 ifm->ifa_prefixlen, ifa_flags,
3627 preferred_lft, valid_lft);
3628 }
3629
3630 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3631 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3632 err = -EEXIST;
3633 else
3634 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3635
3636 in6_ifa_put(ifa);
3637
3638 return err;
3639 }
3640
3641 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3642 u8 scope, int ifindex)
3643 {
3644 struct ifaddrmsg *ifm;
3645
3646 ifm = nlmsg_data(nlh);
3647 ifm->ifa_family = AF_INET6;
3648 ifm->ifa_prefixlen = prefixlen;
3649 ifm->ifa_flags = flags;
3650 ifm->ifa_scope = scope;
3651 ifm->ifa_index = ifindex;
3652 }
3653
3654 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3655 unsigned long tstamp, u32 preferred, u32 valid)
3656 {
3657 struct ifa_cacheinfo ci;
3658
3659 ci.cstamp = cstamp_delta(cstamp);
3660 ci.tstamp = cstamp_delta(tstamp);
3661 ci.ifa_prefered = preferred;
3662 ci.ifa_valid = valid;
3663
3664 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3665 }
3666
3667 static inline int rt_scope(int ifa_scope)
3668 {
3669 if (ifa_scope & IFA_HOST)
3670 return RT_SCOPE_HOST;
3671 else if (ifa_scope & IFA_LINK)
3672 return RT_SCOPE_LINK;
3673 else if (ifa_scope & IFA_SITE)
3674 return RT_SCOPE_SITE;
3675 else
3676 return RT_SCOPE_UNIVERSE;
3677 }
3678
3679 static inline int inet6_ifaddr_msgsize(void)
3680 {
3681 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3682 + nla_total_size(16) /* IFA_ADDRESS */
3683 + nla_total_size(sizeof(struct ifa_cacheinfo));
3684 }
3685
3686 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3687 u32 portid, u32 seq, int event, unsigned int flags)
3688 {
3689 struct nlmsghdr *nlh;
3690 u32 preferred, valid;
3691
3692 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3693 if (nlh == NULL)
3694 return -EMSGSIZE;
3695
3696 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3697 ifa->idev->dev->ifindex);
3698
3699 if (!(ifa->flags&IFA_F_PERMANENT)) {
3700 preferred = ifa->prefered_lft;
3701 valid = ifa->valid_lft;
3702 if (preferred != INFINITY_LIFE_TIME) {
3703 long tval = (jiffies - ifa->tstamp)/HZ;
3704 if (preferred > tval)
3705 preferred -= tval;
3706 else
3707 preferred = 0;
3708 if (valid != INFINITY_LIFE_TIME) {
3709 if (valid > tval)
3710 valid -= tval;
3711 else
3712 valid = 0;
3713 }
3714 }
3715 } else {
3716 preferred = INFINITY_LIFE_TIME;
3717 valid = INFINITY_LIFE_TIME;
3718 }
3719
3720 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3721 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3722 nlmsg_cancel(skb, nlh);
3723 return -EMSGSIZE;
3724 }
3725
3726 return nlmsg_end(skb, nlh);
3727 }
3728
3729 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3730 u32 portid, u32 seq, int event, u16 flags)
3731 {
3732 struct nlmsghdr *nlh;
3733 u8 scope = RT_SCOPE_UNIVERSE;
3734 int ifindex = ifmca->idev->dev->ifindex;
3735
3736 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3737 scope = RT_SCOPE_SITE;
3738
3739 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3740 if (nlh == NULL)
3741 return -EMSGSIZE;
3742
3743 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3744 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3745 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3746 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3747 nlmsg_cancel(skb, nlh);
3748 return -EMSGSIZE;
3749 }
3750
3751 return nlmsg_end(skb, nlh);
3752 }
3753
3754 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3755 u32 portid, u32 seq, int event, unsigned int flags)
3756 {
3757 struct nlmsghdr *nlh;
3758 u8 scope = RT_SCOPE_UNIVERSE;
3759 int ifindex = ifaca->aca_idev->dev->ifindex;
3760
3761 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3762 scope = RT_SCOPE_SITE;
3763
3764 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3765 if (nlh == NULL)
3766 return -EMSGSIZE;
3767
3768 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3769 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3770 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3771 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3772 nlmsg_cancel(skb, nlh);
3773 return -EMSGSIZE;
3774 }
3775
3776 return nlmsg_end(skb, nlh);
3777 }
3778
3779 enum addr_type_t {
3780 UNICAST_ADDR,
3781 MULTICAST_ADDR,
3782 ANYCAST_ADDR,
3783 };
3784
3785 /* called with rcu_read_lock() */
3786 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3787 struct netlink_callback *cb, enum addr_type_t type,
3788 int s_ip_idx, int *p_ip_idx)
3789 {
3790 struct ifmcaddr6 *ifmca;
3791 struct ifacaddr6 *ifaca;
3792 int err = 1;
3793 int ip_idx = *p_ip_idx;
3794
3795 read_lock_bh(&idev->lock);
3796 switch (type) {
3797 case UNICAST_ADDR: {
3798 struct inet6_ifaddr *ifa;
3799
3800 /* unicast address incl. temp addr */
3801 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3802 if (++ip_idx < s_ip_idx)
3803 continue;
3804 err = inet6_fill_ifaddr(skb, ifa,
3805 NETLINK_CB(cb->skb).portid,
3806 cb->nlh->nlmsg_seq,
3807 RTM_NEWADDR,
3808 NLM_F_MULTI);
3809 if (err <= 0)
3810 break;
3811 }
3812 break;
3813 }
3814 case MULTICAST_ADDR:
3815 /* multicast address */
3816 for (ifmca = idev->mc_list; ifmca;
3817 ifmca = ifmca->next, ip_idx++) {
3818 if (ip_idx < s_ip_idx)
3819 continue;
3820 err = inet6_fill_ifmcaddr(skb, ifmca,
3821 NETLINK_CB(cb->skb).portid,
3822 cb->nlh->nlmsg_seq,
3823 RTM_GETMULTICAST,
3824 NLM_F_MULTI);
3825 if (err <= 0)
3826 break;
3827 }
3828 break;
3829 case ANYCAST_ADDR:
3830 /* anycast address */
3831 for (ifaca = idev->ac_list; ifaca;
3832 ifaca = ifaca->aca_next, ip_idx++) {
3833 if (ip_idx < s_ip_idx)
3834 continue;
3835 err = inet6_fill_ifacaddr(skb, ifaca,
3836 NETLINK_CB(cb->skb).portid,
3837 cb->nlh->nlmsg_seq,
3838 RTM_GETANYCAST,
3839 NLM_F_MULTI);
3840 if (err <= 0)
3841 break;
3842 }
3843 break;
3844 default:
3845 break;
3846 }
3847 read_unlock_bh(&idev->lock);
3848 *p_ip_idx = ip_idx;
3849 return err;
3850 }
3851
3852 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3853 enum addr_type_t type)
3854 {
3855 struct net *net = sock_net(skb->sk);
3856 int h, s_h;
3857 int idx, ip_idx;
3858 int s_idx, s_ip_idx;
3859 struct net_device *dev;
3860 struct inet6_dev *idev;
3861 struct hlist_head *head;
3862 struct hlist_node *node;
3863
3864 s_h = cb->args[0];
3865 s_idx = idx = cb->args[1];
3866 s_ip_idx = ip_idx = cb->args[2];
3867
3868 rcu_read_lock();
3869 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3870 idx = 0;
3871 head = &net->dev_index_head[h];
3872 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
3873 if (idx < s_idx)
3874 goto cont;
3875 if (h > s_h || idx > s_idx)
3876 s_ip_idx = 0;
3877 ip_idx = 0;
3878 idev = __in6_dev_get(dev);
3879 if (!idev)
3880 goto cont;
3881
3882 if (in6_dump_addrs(idev, skb, cb, type,
3883 s_ip_idx, &ip_idx) <= 0)
3884 goto done;
3885 cont:
3886 idx++;
3887 }
3888 }
3889 done:
3890 rcu_read_unlock();
3891 cb->args[0] = h;
3892 cb->args[1] = idx;
3893 cb->args[2] = ip_idx;
3894
3895 return skb->len;
3896 }
3897
3898 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3899 {
3900 enum addr_type_t type = UNICAST_ADDR;
3901
3902 return inet6_dump_addr(skb, cb, type);
3903 }
3904
3905 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3906 {
3907 enum addr_type_t type = MULTICAST_ADDR;
3908
3909 return inet6_dump_addr(skb, cb, type);
3910 }
3911
3912
3913 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3914 {
3915 enum addr_type_t type = ANYCAST_ADDR;
3916
3917 return inet6_dump_addr(skb, cb, type);
3918 }
3919
3920 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
3921 void *arg)
3922 {
3923 struct net *net = sock_net(in_skb->sk);
3924 struct ifaddrmsg *ifm;
3925 struct nlattr *tb[IFA_MAX+1];
3926 struct in6_addr *addr = NULL;
3927 struct net_device *dev = NULL;
3928 struct inet6_ifaddr *ifa;
3929 struct sk_buff *skb;
3930 int err;
3931
3932 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3933 if (err < 0)
3934 goto errout;
3935
3936 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3937 if (addr == NULL) {
3938 err = -EINVAL;
3939 goto errout;
3940 }
3941
3942 ifm = nlmsg_data(nlh);
3943 if (ifm->ifa_index)
3944 dev = __dev_get_by_index(net, ifm->ifa_index);
3945
3946 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
3947 if (!ifa) {
3948 err = -EADDRNOTAVAIL;
3949 goto errout;
3950 }
3951
3952 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
3953 if (!skb) {
3954 err = -ENOBUFS;
3955 goto errout_ifa;
3956 }
3957
3958 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
3959 nlh->nlmsg_seq, RTM_NEWADDR, 0);
3960 if (err < 0) {
3961 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3962 WARN_ON(err == -EMSGSIZE);
3963 kfree_skb(skb);
3964 goto errout_ifa;
3965 }
3966 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
3967 errout_ifa:
3968 in6_ifa_put(ifa);
3969 errout:
3970 return err;
3971 }
3972
3973 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
3974 {
3975 struct sk_buff *skb;
3976 struct net *net = dev_net(ifa->idev->dev);
3977 int err = -ENOBUFS;
3978
3979 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
3980 if (skb == NULL)
3981 goto errout;
3982
3983 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
3984 if (err < 0) {
3985 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
3986 WARN_ON(err == -EMSGSIZE);
3987 kfree_skb(skb);
3988 goto errout;
3989 }
3990 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
3991 return;
3992 errout:
3993 if (err < 0)
3994 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
3995 }
3996
3997 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
3998 __s32 *array, int bytes)
3999 {
4000 BUG_ON(bytes < (DEVCONF_MAX * 4));
4001
4002 memset(array, 0, bytes);
4003 array[DEVCONF_FORWARDING] = cnf->forwarding;
4004 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4005 array[DEVCONF_MTU6] = cnf->mtu6;
4006 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4007 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4008 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4009 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4010 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4011 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4012 jiffies_to_msecs(cnf->rtr_solicit_interval);
4013 array[DEVCONF_RTR_SOLICIT_DELAY] =
4014 jiffies_to_msecs(cnf->rtr_solicit_delay);
4015 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4016 #ifdef CONFIG_IPV6_PRIVACY
4017 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4018 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4019 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4020 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4021 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4022 #endif
4023 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4024 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4025 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4026 #ifdef CONFIG_IPV6_ROUTER_PREF
4027 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4028 array[DEVCONF_RTR_PROBE_INTERVAL] =
4029 jiffies_to_msecs(cnf->rtr_probe_interval);
4030 #ifdef CONFIG_IPV6_ROUTE_INFO
4031 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4032 #endif
4033 #endif
4034 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4035 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4036 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4037 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4038 #endif
4039 #ifdef CONFIG_IPV6_MROUTE
4040 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4041 #endif
4042 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4043 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4044 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4045 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4046 }
4047
4048 static inline size_t inet6_ifla6_size(void)
4049 {
4050 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4051 + nla_total_size(sizeof(struct ifla_cacheinfo))
4052 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4053 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4054 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
4055 }
4056
4057 static inline size_t inet6_if_nlmsg_size(void)
4058 {
4059 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4060 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4061 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4062 + nla_total_size(4) /* IFLA_MTU */
4063 + nla_total_size(4) /* IFLA_LINK */
4064 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4065 }
4066
4067 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4068 int items, int bytes)
4069 {
4070 int i;
4071 int pad = bytes - sizeof(u64) * items;
4072 BUG_ON(pad < 0);
4073
4074 /* Use put_unaligned() because stats may not be aligned for u64. */
4075 put_unaligned(items, &stats[0]);
4076 for (i = 1; i < items; i++)
4077 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4078
4079 memset(&stats[items], 0, pad);
4080 }
4081
4082 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4083 int items, int bytes, size_t syncpoff)
4084 {
4085 int i;
4086 int pad = bytes - sizeof(u64) * items;
4087 BUG_ON(pad < 0);
4088
4089 /* Use put_unaligned() because stats may not be aligned for u64. */
4090 put_unaligned(items, &stats[0]);
4091 for (i = 1; i < items; i++)
4092 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4093
4094 memset(&stats[items], 0, pad);
4095 }
4096
4097 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4098 int bytes)
4099 {
4100 switch (attrtype) {
4101 case IFLA_INET6_STATS:
4102 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4103 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4104 break;
4105 case IFLA_INET6_ICMP6STATS:
4106 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4107 break;
4108 }
4109 }
4110
4111 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4112 {
4113 struct nlattr *nla;
4114 struct ifla_cacheinfo ci;
4115
4116 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4117 goto nla_put_failure;
4118 ci.max_reasm_len = IPV6_MAXPLEN;
4119 ci.tstamp = cstamp_delta(idev->tstamp);
4120 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4121 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4122 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4123 goto nla_put_failure;
4124 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4125 if (nla == NULL)
4126 goto nla_put_failure;
4127 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4128
4129 /* XXX - MC not implemented */
4130
4131 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4132 if (nla == NULL)
4133 goto nla_put_failure;
4134 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4135
4136 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4137 if (nla == NULL)
4138 goto nla_put_failure;
4139 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4140
4141 return 0;
4142
4143 nla_put_failure:
4144 return -EMSGSIZE;
4145 }
4146
4147 static size_t inet6_get_link_af_size(const struct net_device *dev)
4148 {
4149 if (!__in6_dev_get(dev))
4150 return 0;
4151
4152 return inet6_ifla6_size();
4153 }
4154
4155 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4156 {
4157 struct inet6_dev *idev = __in6_dev_get(dev);
4158
4159 if (!idev)
4160 return -ENODATA;
4161
4162 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4163 return -EMSGSIZE;
4164
4165 return 0;
4166 }
4167
4168 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4169 u32 portid, u32 seq, int event, unsigned int flags)
4170 {
4171 struct net_device *dev = idev->dev;
4172 struct ifinfomsg *hdr;
4173 struct nlmsghdr *nlh;
4174 void *protoinfo;
4175
4176 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4177 if (nlh == NULL)
4178 return -EMSGSIZE;
4179
4180 hdr = nlmsg_data(nlh);
4181 hdr->ifi_family = AF_INET6;
4182 hdr->__ifi_pad = 0;
4183 hdr->ifi_type = dev->type;
4184 hdr->ifi_index = dev->ifindex;
4185 hdr->ifi_flags = dev_get_flags(dev);
4186 hdr->ifi_change = 0;
4187
4188 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4189 (dev->addr_len &&
4190 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4191 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4192 (dev->ifindex != dev->iflink &&
4193 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4194 goto nla_put_failure;
4195 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4196 if (protoinfo == NULL)
4197 goto nla_put_failure;
4198
4199 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4200 goto nla_put_failure;
4201
4202 nla_nest_end(skb, protoinfo);
4203 return nlmsg_end(skb, nlh);
4204
4205 nla_put_failure:
4206 nlmsg_cancel(skb, nlh);
4207 return -EMSGSIZE;
4208 }
4209
4210 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4211 {
4212 struct net *net = sock_net(skb->sk);
4213 int h, s_h;
4214 int idx = 0, s_idx;
4215 struct net_device *dev;
4216 struct inet6_dev *idev;
4217 struct hlist_head *head;
4218 struct hlist_node *node;
4219
4220 s_h = cb->args[0];
4221 s_idx = cb->args[1];
4222
4223 rcu_read_lock();
4224 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4225 idx = 0;
4226 head = &net->dev_index_head[h];
4227 hlist_for_each_entry_rcu(dev, node, head, index_hlist) {
4228 if (idx < s_idx)
4229 goto cont;
4230 idev = __in6_dev_get(dev);
4231 if (!idev)
4232 goto cont;
4233 if (inet6_fill_ifinfo(skb, idev,
4234 NETLINK_CB(cb->skb).portid,
4235 cb->nlh->nlmsg_seq,
4236 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4237 goto out;
4238 cont:
4239 idx++;
4240 }
4241 }
4242 out:
4243 rcu_read_unlock();
4244 cb->args[1] = idx;
4245 cb->args[0] = h;
4246
4247 return skb->len;
4248 }
4249
4250 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4251 {
4252 struct sk_buff *skb;
4253 struct net *net = dev_net(idev->dev);
4254 int err = -ENOBUFS;
4255
4256 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4257 if (skb == NULL)
4258 goto errout;
4259
4260 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4261 if (err < 0) {
4262 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4263 WARN_ON(err == -EMSGSIZE);
4264 kfree_skb(skb);
4265 goto errout;
4266 }
4267 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4268 return;
4269 errout:
4270 if (err < 0)
4271 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4272 }
4273
4274 static inline size_t inet6_prefix_nlmsg_size(void)
4275 {
4276 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4277 + nla_total_size(sizeof(struct in6_addr))
4278 + nla_total_size(sizeof(struct prefix_cacheinfo));
4279 }
4280
4281 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4282 struct prefix_info *pinfo, u32 portid, u32 seq,
4283 int event, unsigned int flags)
4284 {
4285 struct prefixmsg *pmsg;
4286 struct nlmsghdr *nlh;
4287 struct prefix_cacheinfo ci;
4288
4289 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4290 if (nlh == NULL)
4291 return -EMSGSIZE;
4292
4293 pmsg = nlmsg_data(nlh);
4294 pmsg->prefix_family = AF_INET6;
4295 pmsg->prefix_pad1 = 0;
4296 pmsg->prefix_pad2 = 0;
4297 pmsg->prefix_ifindex = idev->dev->ifindex;
4298 pmsg->prefix_len = pinfo->prefix_len;
4299 pmsg->prefix_type = pinfo->type;
4300 pmsg->prefix_pad3 = 0;
4301 pmsg->prefix_flags = 0;
4302 if (pinfo->onlink)
4303 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4304 if (pinfo->autoconf)
4305 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4306
4307 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4308 goto nla_put_failure;
4309 ci.preferred_time = ntohl(pinfo->prefered);
4310 ci.valid_time = ntohl(pinfo->valid);
4311 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4312 goto nla_put_failure;
4313 return nlmsg_end(skb, nlh);
4314
4315 nla_put_failure:
4316 nlmsg_cancel(skb, nlh);
4317 return -EMSGSIZE;
4318 }
4319
4320 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4321 struct prefix_info *pinfo)
4322 {
4323 struct sk_buff *skb;
4324 struct net *net = dev_net(idev->dev);
4325 int err = -ENOBUFS;
4326
4327 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4328 if (skb == NULL)
4329 goto errout;
4330
4331 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4332 if (err < 0) {
4333 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4334 WARN_ON(err == -EMSGSIZE);
4335 kfree_skb(skb);
4336 goto errout;
4337 }
4338 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4339 return;
4340 errout:
4341 if (err < 0)
4342 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4343 }
4344
4345 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4346 {
4347 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4348
4349 switch (event) {
4350 case RTM_NEWADDR:
4351 /*
4352 * If the address was optimistic
4353 * we inserted the route at the start of
4354 * our DAD process, so we don't need
4355 * to do it again
4356 */
4357 if (!(ifp->rt->rt6i_node))
4358 ip6_ins_rt(ifp->rt);
4359 if (ifp->idev->cnf.forwarding)
4360 addrconf_join_anycast(ifp);
4361 break;
4362 case RTM_DELADDR:
4363 if (ifp->idev->cnf.forwarding)
4364 addrconf_leave_anycast(ifp);
4365 addrconf_leave_solict(ifp->idev, &ifp->addr);
4366 dst_hold(&ifp->rt->dst);
4367
4368 if (ip6_del_rt(ifp->rt))
4369 dst_free(&ifp->rt->dst);
4370 break;
4371 }
4372 }
4373
4374 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4375 {
4376 rcu_read_lock_bh();
4377 if (likely(ifp->idev->dead == 0))
4378 __ipv6_ifa_notify(event, ifp);
4379 rcu_read_unlock_bh();
4380 }
4381
4382 #ifdef CONFIG_SYSCTL
4383
4384 static
4385 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4386 void __user *buffer, size_t *lenp, loff_t *ppos)
4387 {
4388 int *valp = ctl->data;
4389 int val = *valp;
4390 loff_t pos = *ppos;
4391 ctl_table lctl;
4392 int ret;
4393
4394 /*
4395 * ctl->data points to idev->cnf.forwarding, we should
4396 * not modify it until we get the rtnl lock.
4397 */
4398 lctl = *ctl;
4399 lctl.data = &val;
4400
4401 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4402
4403 if (write)
4404 ret = addrconf_fixup_forwarding(ctl, valp, val);
4405 if (ret)
4406 *ppos = pos;
4407 return ret;
4408 }
4409
4410 static void dev_disable_change(struct inet6_dev *idev)
4411 {
4412 if (!idev || !idev->dev)
4413 return;
4414
4415 if (idev->cnf.disable_ipv6)
4416 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4417 else
4418 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4419 }
4420
4421 static void addrconf_disable_change(struct net *net, __s32 newf)
4422 {
4423 struct net_device *dev;
4424 struct inet6_dev *idev;
4425
4426 rcu_read_lock();
4427 for_each_netdev_rcu(net, dev) {
4428 idev = __in6_dev_get(dev);
4429 if (idev) {
4430 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4431 idev->cnf.disable_ipv6 = newf;
4432 if (changed)
4433 dev_disable_change(idev);
4434 }
4435 }
4436 rcu_read_unlock();
4437 }
4438
4439 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4440 {
4441 struct net *net;
4442 int old;
4443
4444 if (!rtnl_trylock())
4445 return restart_syscall();
4446
4447 net = (struct net *)table->extra2;
4448 old = *p;
4449 *p = newf;
4450
4451 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4452 rtnl_unlock();
4453 return 0;
4454 }
4455
4456 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4457 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4458 addrconf_disable_change(net, newf);
4459 } else if ((!newf) ^ (!old))
4460 dev_disable_change((struct inet6_dev *)table->extra1);
4461
4462 rtnl_unlock();
4463 return 0;
4464 }
4465
4466 static
4467 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4468 void __user *buffer, size_t *lenp, loff_t *ppos)
4469 {
4470 int *valp = ctl->data;
4471 int val = *valp;
4472 loff_t pos = *ppos;
4473 ctl_table lctl;
4474 int ret;
4475
4476 /*
4477 * ctl->data points to idev->cnf.disable_ipv6, we should
4478 * not modify it until we get the rtnl lock.
4479 */
4480 lctl = *ctl;
4481 lctl.data = &val;
4482
4483 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4484
4485 if (write)
4486 ret = addrconf_disable_ipv6(ctl, valp, val);
4487 if (ret)
4488 *ppos = pos;
4489 return ret;
4490 }
4491
4492 static struct addrconf_sysctl_table
4493 {
4494 struct ctl_table_header *sysctl_header;
4495 ctl_table addrconf_vars[DEVCONF_MAX+1];
4496 } addrconf_sysctl __read_mostly = {
4497 .sysctl_header = NULL,
4498 .addrconf_vars = {
4499 {
4500 .procname = "forwarding",
4501 .data = &ipv6_devconf.forwarding,
4502 .maxlen = sizeof(int),
4503 .mode = 0644,
4504 .proc_handler = addrconf_sysctl_forward,
4505 },
4506 {
4507 .procname = "hop_limit",
4508 .data = &ipv6_devconf.hop_limit,
4509 .maxlen = sizeof(int),
4510 .mode = 0644,
4511 .proc_handler = proc_dointvec,
4512 },
4513 {
4514 .procname = "mtu",
4515 .data = &ipv6_devconf.mtu6,
4516 .maxlen = sizeof(int),
4517 .mode = 0644,
4518 .proc_handler = proc_dointvec,
4519 },
4520 {
4521 .procname = "accept_ra",
4522 .data = &ipv6_devconf.accept_ra,
4523 .maxlen = sizeof(int),
4524 .mode = 0644,
4525 .proc_handler = proc_dointvec,
4526 },
4527 {
4528 .procname = "accept_redirects",
4529 .data = &ipv6_devconf.accept_redirects,
4530 .maxlen = sizeof(int),
4531 .mode = 0644,
4532 .proc_handler = proc_dointvec,
4533 },
4534 {
4535 .procname = "autoconf",
4536 .data = &ipv6_devconf.autoconf,
4537 .maxlen = sizeof(int),
4538 .mode = 0644,
4539 .proc_handler = proc_dointvec,
4540 },
4541 {
4542 .procname = "dad_transmits",
4543 .data = &ipv6_devconf.dad_transmits,
4544 .maxlen = sizeof(int),
4545 .mode = 0644,
4546 .proc_handler = proc_dointvec,
4547 },
4548 {
4549 .procname = "router_solicitations",
4550 .data = &ipv6_devconf.rtr_solicits,
4551 .maxlen = sizeof(int),
4552 .mode = 0644,
4553 .proc_handler = proc_dointvec,
4554 },
4555 {
4556 .procname = "router_solicitation_interval",
4557 .data = &ipv6_devconf.rtr_solicit_interval,
4558 .maxlen = sizeof(int),
4559 .mode = 0644,
4560 .proc_handler = proc_dointvec_jiffies,
4561 },
4562 {
4563 .procname = "router_solicitation_delay",
4564 .data = &ipv6_devconf.rtr_solicit_delay,
4565 .maxlen = sizeof(int),
4566 .mode = 0644,
4567 .proc_handler = proc_dointvec_jiffies,
4568 },
4569 {
4570 .procname = "force_mld_version",
4571 .data = &ipv6_devconf.force_mld_version,
4572 .maxlen = sizeof(int),
4573 .mode = 0644,
4574 .proc_handler = proc_dointvec,
4575 },
4576 #ifdef CONFIG_IPV6_PRIVACY
4577 {
4578 .procname = "use_tempaddr",
4579 .data = &ipv6_devconf.use_tempaddr,
4580 .maxlen = sizeof(int),
4581 .mode = 0644,
4582 .proc_handler = proc_dointvec,
4583 },
4584 {
4585 .procname = "temp_valid_lft",
4586 .data = &ipv6_devconf.temp_valid_lft,
4587 .maxlen = sizeof(int),
4588 .mode = 0644,
4589 .proc_handler = proc_dointvec,
4590 },
4591 {
4592 .procname = "temp_prefered_lft",
4593 .data = &ipv6_devconf.temp_prefered_lft,
4594 .maxlen = sizeof(int),
4595 .mode = 0644,
4596 .proc_handler = proc_dointvec,
4597 },
4598 {
4599 .procname = "regen_max_retry",
4600 .data = &ipv6_devconf.regen_max_retry,
4601 .maxlen = sizeof(int),
4602 .mode = 0644,
4603 .proc_handler = proc_dointvec,
4604 },
4605 {
4606 .procname = "max_desync_factor",
4607 .data = &ipv6_devconf.max_desync_factor,
4608 .maxlen = sizeof(int),
4609 .mode = 0644,
4610 .proc_handler = proc_dointvec,
4611 },
4612 #endif
4613 {
4614 .procname = "max_addresses",
4615 .data = &ipv6_devconf.max_addresses,
4616 .maxlen = sizeof(int),
4617 .mode = 0644,
4618 .proc_handler = proc_dointvec,
4619 },
4620 {
4621 .procname = "accept_ra_defrtr",
4622 .data = &ipv6_devconf.accept_ra_defrtr,
4623 .maxlen = sizeof(int),
4624 .mode = 0644,
4625 .proc_handler = proc_dointvec,
4626 },
4627 {
4628 .procname = "accept_ra_pinfo",
4629 .data = &ipv6_devconf.accept_ra_pinfo,
4630 .maxlen = sizeof(int),
4631 .mode = 0644,
4632 .proc_handler = proc_dointvec,
4633 },
4634 #ifdef CONFIG_IPV6_ROUTER_PREF
4635 {
4636 .procname = "accept_ra_rtr_pref",
4637 .data = &ipv6_devconf.accept_ra_rtr_pref,
4638 .maxlen = sizeof(int),
4639 .mode = 0644,
4640 .proc_handler = proc_dointvec,
4641 },
4642 {
4643 .procname = "router_probe_interval",
4644 .data = &ipv6_devconf.rtr_probe_interval,
4645 .maxlen = sizeof(int),
4646 .mode = 0644,
4647 .proc_handler = proc_dointvec_jiffies,
4648 },
4649 #ifdef CONFIG_IPV6_ROUTE_INFO
4650 {
4651 .procname = "accept_ra_rt_info_max_plen",
4652 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4653 .maxlen = sizeof(int),
4654 .mode = 0644,
4655 .proc_handler = proc_dointvec,
4656 },
4657 #endif
4658 #endif
4659 {
4660 .procname = "proxy_ndp",
4661 .data = &ipv6_devconf.proxy_ndp,
4662 .maxlen = sizeof(int),
4663 .mode = 0644,
4664 .proc_handler = proc_dointvec,
4665 },
4666 {
4667 .procname = "accept_source_route",
4668 .data = &ipv6_devconf.accept_source_route,
4669 .maxlen = sizeof(int),
4670 .mode = 0644,
4671 .proc_handler = proc_dointvec,
4672 },
4673 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4674 {
4675 .procname = "optimistic_dad",
4676 .data = &ipv6_devconf.optimistic_dad,
4677 .maxlen = sizeof(int),
4678 .mode = 0644,
4679 .proc_handler = proc_dointvec,
4680
4681 },
4682 #endif
4683 #ifdef CONFIG_IPV6_MROUTE
4684 {
4685 .procname = "mc_forwarding",
4686 .data = &ipv6_devconf.mc_forwarding,
4687 .maxlen = sizeof(int),
4688 .mode = 0444,
4689 .proc_handler = proc_dointvec,
4690 },
4691 #endif
4692 {
4693 .procname = "disable_ipv6",
4694 .data = &ipv6_devconf.disable_ipv6,
4695 .maxlen = sizeof(int),
4696 .mode = 0644,
4697 .proc_handler = addrconf_sysctl_disable,
4698 },
4699 {
4700 .procname = "accept_dad",
4701 .data = &ipv6_devconf.accept_dad,
4702 .maxlen = sizeof(int),
4703 .mode = 0644,
4704 .proc_handler = proc_dointvec,
4705 },
4706 {
4707 .procname = "force_tllao",
4708 .data = &ipv6_devconf.force_tllao,
4709 .maxlen = sizeof(int),
4710 .mode = 0644,
4711 .proc_handler = proc_dointvec
4712 },
4713 {
4714 .procname = "ndisc_notify",
4715 .data = &ipv6_devconf.ndisc_notify,
4716 .maxlen = sizeof(int),
4717 .mode = 0644,
4718 .proc_handler = proc_dointvec
4719 },
4720 {
4721 /* sentinel */
4722 }
4723 },
4724 };
4725
4726 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4727 struct inet6_dev *idev, struct ipv6_devconf *p)
4728 {
4729 int i;
4730 struct addrconf_sysctl_table *t;
4731 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4732
4733 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4734 if (t == NULL)
4735 goto out;
4736
4737 for (i = 0; t->addrconf_vars[i].data; i++) {
4738 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4739 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4740 t->addrconf_vars[i].extra2 = net;
4741 }
4742
4743 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4744
4745 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4746 if (t->sysctl_header == NULL)
4747 goto free;
4748
4749 p->sysctl = t;
4750 return 0;
4751
4752 free:
4753 kfree(t);
4754 out:
4755 return -ENOBUFS;
4756 }
4757
4758 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4759 {
4760 struct addrconf_sysctl_table *t;
4761
4762 if (p->sysctl == NULL)
4763 return;
4764
4765 t = p->sysctl;
4766 p->sysctl = NULL;
4767 unregister_net_sysctl_table(t->sysctl_header);
4768 kfree(t);
4769 }
4770
4771 static void addrconf_sysctl_register(struct inet6_dev *idev)
4772 {
4773 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4774 &ndisc_ifinfo_sysctl_change);
4775 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4776 idev, &idev->cnf);
4777 }
4778
4779 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4780 {
4781 __addrconf_sysctl_unregister(&idev->cnf);
4782 neigh_sysctl_unregister(idev->nd_parms);
4783 }
4784
4785
4786 #endif
4787
4788 static int __net_init addrconf_init_net(struct net *net)
4789 {
4790 int err;
4791 struct ipv6_devconf *all, *dflt;
4792
4793 err = -ENOMEM;
4794 all = &ipv6_devconf;
4795 dflt = &ipv6_devconf_dflt;
4796
4797 if (!net_eq(net, &init_net)) {
4798 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4799 if (all == NULL)
4800 goto err_alloc_all;
4801
4802 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4803 if (dflt == NULL)
4804 goto err_alloc_dflt;
4805 } else {
4806 /* these will be inherited by all namespaces */
4807 dflt->autoconf = ipv6_defaults.autoconf;
4808 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4809 }
4810
4811 net->ipv6.devconf_all = all;
4812 net->ipv6.devconf_dflt = dflt;
4813
4814 #ifdef CONFIG_SYSCTL
4815 err = __addrconf_sysctl_register(net, "all", NULL, all);
4816 if (err < 0)
4817 goto err_reg_all;
4818
4819 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4820 if (err < 0)
4821 goto err_reg_dflt;
4822 #endif
4823 return 0;
4824
4825 #ifdef CONFIG_SYSCTL
4826 err_reg_dflt:
4827 __addrconf_sysctl_unregister(all);
4828 err_reg_all:
4829 kfree(dflt);
4830 #endif
4831 err_alloc_dflt:
4832 kfree(all);
4833 err_alloc_all:
4834 return err;
4835 }
4836
4837 static void __net_exit addrconf_exit_net(struct net *net)
4838 {
4839 #ifdef CONFIG_SYSCTL
4840 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4841 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4842 #endif
4843 if (!net_eq(net, &init_net)) {
4844 kfree(net->ipv6.devconf_dflt);
4845 kfree(net->ipv6.devconf_all);
4846 }
4847 }
4848
4849 static struct pernet_operations addrconf_ops = {
4850 .init = addrconf_init_net,
4851 .exit = addrconf_exit_net,
4852 };
4853
4854 /*
4855 * Device notifier
4856 */
4857
4858 int register_inet6addr_notifier(struct notifier_block *nb)
4859 {
4860 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4861 }
4862 EXPORT_SYMBOL(register_inet6addr_notifier);
4863
4864 int unregister_inet6addr_notifier(struct notifier_block *nb)
4865 {
4866 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4867 }
4868 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4869
4870 static struct rtnl_af_ops inet6_ops = {
4871 .family = AF_INET6,
4872 .fill_link_af = inet6_fill_link_af,
4873 .get_link_af_size = inet6_get_link_af_size,
4874 };
4875
4876 /*
4877 * Init / cleanup code
4878 */
4879
4880 int __init addrconf_init(void)
4881 {
4882 int i, err;
4883
4884 err = ipv6_addr_label_init();
4885 if (err < 0) {
4886 pr_crit("%s: cannot initialize default policy table: %d\n",
4887 __func__, err);
4888 goto out;
4889 }
4890
4891 err = register_pernet_subsys(&addrconf_ops);
4892 if (err < 0)
4893 goto out_addrlabel;
4894
4895 /* The addrconf netdev notifier requires that loopback_dev
4896 * has it's ipv6 private information allocated and setup
4897 * before it can bring up and give link-local addresses
4898 * to other devices which are up.
4899 *
4900 * Unfortunately, loopback_dev is not necessarily the first
4901 * entry in the global dev_base list of net devices. In fact,
4902 * it is likely to be the very last entry on that list.
4903 * So this causes the notifier registry below to try and
4904 * give link-local addresses to all devices besides loopback_dev
4905 * first, then loopback_dev, which cases all the non-loopback_dev
4906 * devices to fail to get a link-local address.
4907 *
4908 * So, as a temporary fix, allocate the ipv6 structure for
4909 * loopback_dev first by hand.
4910 * Longer term, all of the dependencies ipv6 has upon the loopback
4911 * device and it being up should be removed.
4912 */
4913 rtnl_lock();
4914 if (!ipv6_add_dev(init_net.loopback_dev))
4915 err = -ENOMEM;
4916 rtnl_unlock();
4917 if (err)
4918 goto errlo;
4919
4920 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4921 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4922
4923 register_netdevice_notifier(&ipv6_dev_notf);
4924
4925 addrconf_verify(0);
4926
4927 err = rtnl_af_register(&inet6_ops);
4928 if (err < 0)
4929 goto errout_af;
4930
4931 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4932 NULL);
4933 if (err < 0)
4934 goto errout;
4935
4936 /* Only the first call to __rtnl_register can fail */
4937 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
4938 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
4939 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
4940 inet6_dump_ifaddr, NULL);
4941 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
4942 inet6_dump_ifmcaddr, NULL);
4943 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
4944 inet6_dump_ifacaddr, NULL);
4945 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
4946 NULL, NULL);
4947
4948 ipv6_addr_label_rtnl_register();
4949
4950 return 0;
4951 errout:
4952 rtnl_af_unregister(&inet6_ops);
4953 errout_af:
4954 unregister_netdevice_notifier(&ipv6_dev_notf);
4955 errlo:
4956 unregister_pernet_subsys(&addrconf_ops);
4957 out_addrlabel:
4958 ipv6_addr_label_cleanup();
4959 out:
4960 return err;
4961 }
4962
4963 void addrconf_cleanup(void)
4964 {
4965 struct net_device *dev;
4966 int i;
4967
4968 unregister_netdevice_notifier(&ipv6_dev_notf);
4969 unregister_pernet_subsys(&addrconf_ops);
4970 ipv6_addr_label_cleanup();
4971
4972 rtnl_lock();
4973
4974 __rtnl_af_unregister(&inet6_ops);
4975
4976 /* clean dev list */
4977 for_each_netdev(&init_net, dev) {
4978 if (__in6_dev_get(dev) == NULL)
4979 continue;
4980 addrconf_ifdown(dev, 1);
4981 }
4982 addrconf_ifdown(init_net.loopback_dev, 2);
4983
4984 /*
4985 * Check hash table.
4986 */
4987 spin_lock_bh(&addrconf_hash_lock);
4988 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4989 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
4990 spin_unlock_bh(&addrconf_hash_lock);
4991
4992 del_timer(&addr_chk_timer);
4993 rtnl_unlock();
4994 }
Linux kernel - Deliverables
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