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Merge remote-tracking branches 'asoc/topic/atmel', 'asoc/topic/bcm2835' and 'asoc...
[mirror_ubuntu-zesty-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_addr.h>
53 #include <linux/if_arp.h>
54 #include <linux/if_arcnet.h>
55 #include <linux/if_infiniband.h>
56 #include <linux/route.h>
57 #include <linux/inetdevice.h>
58 #include <linux/init.h>
59 #include <linux/slab.h>
60 #ifdef CONFIG_SYSCTL
61 #include <linux/sysctl.h>
62 #endif
63 #include <linux/capability.h>
64 #include <linux/delay.h>
65 #include <linux/notifier.h>
66 #include <linux/string.h>
67 #include <linux/hash.h>
68
69 #include <net/net_namespace.h>
70 #include <net/sock.h>
71 #include <net/snmp.h>
72
73 #include <net/6lowpan.h>
74 #include <net/firewire.h>
75 #include <net/ipv6.h>
76 #include <net/protocol.h>
77 #include <net/ndisc.h>
78 #include <net/ip6_route.h>
79 #include <net/addrconf.h>
80 #include <net/tcp.h>
81 #include <net/ip.h>
82 #include <net/netlink.h>
83 #include <net/pkt_sched.h>
84 #include <net/l3mdev.h>
85 #include <linux/if_tunnel.h>
86 #include <linux/rtnetlink.h>
87 #include <linux/netconf.h>
88 #include <linux/random.h>
89 #include <linux/uaccess.h>
90 #include <asm/unaligned.h>
91
92 #include <linux/proc_fs.h>
93 #include <linux/seq_file.h>
94 #include <linux/export.h>
95
96 /* Set to 3 to get tracing... */
97 #define ACONF_DEBUG 2
98
99 #if ACONF_DEBUG >= 3
100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
101 #else
102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
103 #endif
104
105 #define INFINITY_LIFE_TIME 0xFFFFFFFF
106
107 #define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
110 static inline u32 cstamp_delta(unsigned long cstamp)
111 {
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113 }
114
115 #ifdef CONFIG_SYSCTL
116 static int addrconf_sysctl_register(struct inet6_dev *idev);
117 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118 #else
119 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
120 {
121 return 0;
122 }
123
124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125 {
126 }
127 #endif
128
129 static void __ipv6_regen_rndid(struct inet6_dev *idev);
130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
131 static void ipv6_regen_rndid(unsigned long data);
132
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
135 static int ipv6_generate_stable_address(struct in6_addr *addr,
136 u8 dad_count,
137 const 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(void);
146 static void addrconf_verify_rtnl(void);
147 static void addrconf_verify_work(struct work_struct *);
148
149 static struct workqueue_struct *addrconf_wq;
150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
151
152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154
155 static void addrconf_type_change(struct net_device *dev,
156 unsigned long event);
157 static int addrconf_ifdown(struct net_device *dev, int how);
158
159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160 int plen,
161 const struct net_device *dev,
162 u32 flags, u32 noflags);
163
164 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
165 static void addrconf_dad_work(struct work_struct *w);
166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
167 static void addrconf_dad_run(struct inet6_dev *idev);
168 static void addrconf_rs_timer(unsigned long data);
169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171
172 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
173 struct prefix_info *pinfo);
174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175 struct net_device *dev);
176
177 static struct ipv6_devconf ipv6_devconf __read_mostly = {
178 .forwarding = 0,
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
181 .accept_ra = 1,
182 .accept_redirects = 1,
183 .autoconf = 1,
184 .force_mld_version = 0,
185 .mldv1_unsolicited_report_interval = 10 * HZ,
186 .mldv2_unsolicited_report_interval = HZ,
187 .dad_transmits = 1,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
191 .use_tempaddr = 0,
192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
196 .max_addresses = IPV6_MAX_ADDRESSES,
197 .accept_ra_defrtr = 1,
198 .accept_ra_from_local = 0,
199 .accept_ra_min_hop_limit= 1,
200 .accept_ra_pinfo = 1,
201 #ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
203 .rtr_probe_interval = 60 * HZ,
204 #ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
206 #endif
207 #endif
208 .proxy_ndp = 0,
209 .accept_source_route = 0, /* we do not accept RH0 by default. */
210 .disable_ipv6 = 0,
211 .accept_dad = 1,
212 .suppress_frag_ndisc = 1,
213 .accept_ra_mtu = 1,
214 .stable_secret = {
215 .initialized = false,
216 },
217 .use_oif_addrs_only = 0,
218 .ignore_routes_with_linkdown = 0,
219 };
220
221 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
222 .forwarding = 0,
223 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
224 .mtu6 = IPV6_MIN_MTU,
225 .accept_ra = 1,
226 .accept_redirects = 1,
227 .autoconf = 1,
228 .force_mld_version = 0,
229 .mldv1_unsolicited_report_interval = 10 * HZ,
230 .mldv2_unsolicited_report_interval = HZ,
231 .dad_transmits = 1,
232 .rtr_solicits = MAX_RTR_SOLICITATIONS,
233 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
234 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
235 .use_tempaddr = 0,
236 .temp_valid_lft = TEMP_VALID_LIFETIME,
237 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
238 .regen_max_retry = REGEN_MAX_RETRY,
239 .max_desync_factor = MAX_DESYNC_FACTOR,
240 .max_addresses = IPV6_MAX_ADDRESSES,
241 .accept_ra_defrtr = 1,
242 .accept_ra_from_local = 0,
243 .accept_ra_min_hop_limit= 1,
244 .accept_ra_pinfo = 1,
245 #ifdef CONFIG_IPV6_ROUTER_PREF
246 .accept_ra_rtr_pref = 1,
247 .rtr_probe_interval = 60 * HZ,
248 #ifdef CONFIG_IPV6_ROUTE_INFO
249 .accept_ra_rt_info_max_plen = 0,
250 #endif
251 #endif
252 .proxy_ndp = 0,
253 .accept_source_route = 0, /* we do not accept RH0 by default. */
254 .disable_ipv6 = 0,
255 .accept_dad = 1,
256 .suppress_frag_ndisc = 1,
257 .accept_ra_mtu = 1,
258 .stable_secret = {
259 .initialized = false,
260 },
261 .use_oif_addrs_only = 0,
262 .ignore_routes_with_linkdown = 0,
263 };
264
265 /* Check if a valid qdisc is available */
266 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
267 {
268 return !qdisc_tx_is_noop(dev);
269 }
270
271 static void addrconf_del_rs_timer(struct inet6_dev *idev)
272 {
273 if (del_timer(&idev->rs_timer))
274 __in6_dev_put(idev);
275 }
276
277 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
278 {
279 if (cancel_delayed_work(&ifp->dad_work))
280 __in6_ifa_put(ifp);
281 }
282
283 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
284 unsigned long when)
285 {
286 if (!timer_pending(&idev->rs_timer))
287 in6_dev_hold(idev);
288 mod_timer(&idev->rs_timer, jiffies + when);
289 }
290
291 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
292 unsigned long delay)
293 {
294 if (!delayed_work_pending(&ifp->dad_work))
295 in6_ifa_hold(ifp);
296 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
297 }
298
299 static int snmp6_alloc_dev(struct inet6_dev *idev)
300 {
301 int i;
302
303 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
304 if (!idev->stats.ipv6)
305 goto err_ip;
306
307 for_each_possible_cpu(i) {
308 struct ipstats_mib *addrconf_stats;
309 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
310 u64_stats_init(&addrconf_stats->syncp);
311 }
312
313
314 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
315 GFP_KERNEL);
316 if (!idev->stats.icmpv6dev)
317 goto err_icmp;
318 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
319 GFP_KERNEL);
320 if (!idev->stats.icmpv6msgdev)
321 goto err_icmpmsg;
322
323 return 0;
324
325 err_icmpmsg:
326 kfree(idev->stats.icmpv6dev);
327 err_icmp:
328 free_percpu(idev->stats.ipv6);
329 err_ip:
330 return -ENOMEM;
331 }
332
333 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
334 {
335 struct inet6_dev *ndev;
336 int err = -ENOMEM;
337
338 ASSERT_RTNL();
339
340 if (dev->mtu < IPV6_MIN_MTU)
341 return ERR_PTR(-EINVAL);
342
343 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
344 if (!ndev)
345 return ERR_PTR(err);
346
347 rwlock_init(&ndev->lock);
348 ndev->dev = dev;
349 INIT_LIST_HEAD(&ndev->addr_list);
350 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
351 (unsigned long)ndev);
352 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
353
354 if (ndev->cnf.stable_secret.initialized)
355 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
356 else
357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
358
359 ndev->cnf.mtu6 = dev->mtu;
360 ndev->cnf.sysctl = NULL;
361 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
362 if (!ndev->nd_parms) {
363 kfree(ndev);
364 return ERR_PTR(err);
365 }
366 if (ndev->cnf.forwarding)
367 dev_disable_lro(dev);
368 /* We refer to the device */
369 dev_hold(dev);
370
371 if (snmp6_alloc_dev(ndev) < 0) {
372 ADBG(KERN_WARNING
373 "%s: cannot allocate memory for statistics; dev=%s.\n",
374 __func__, dev->name);
375 neigh_parms_release(&nd_tbl, ndev->nd_parms);
376 dev_put(dev);
377 kfree(ndev);
378 return ERR_PTR(err);
379 }
380
381 if (snmp6_register_dev(ndev) < 0) {
382 ADBG(KERN_WARNING
383 "%s: cannot create /proc/net/dev_snmp6/%s\n",
384 __func__, dev->name);
385 goto err_release;
386 }
387
388 /* One reference from device. We must do this before
389 * we invoke __ipv6_regen_rndid().
390 */
391 in6_dev_hold(ndev);
392
393 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
394 ndev->cnf.accept_dad = -1;
395
396 #if IS_ENABLED(CONFIG_IPV6_SIT)
397 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
398 pr_info("%s: Disabled Multicast RS\n", dev->name);
399 ndev->cnf.rtr_solicits = 0;
400 }
401 #endif
402
403 INIT_LIST_HEAD(&ndev->tempaddr_list);
404 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
405 if ((dev->flags&IFF_LOOPBACK) ||
406 dev->type == ARPHRD_TUNNEL ||
407 dev->type == ARPHRD_TUNNEL6 ||
408 dev->type == ARPHRD_SIT ||
409 dev->type == ARPHRD_NONE) {
410 ndev->cnf.use_tempaddr = -1;
411 } else {
412 in6_dev_hold(ndev);
413 ipv6_regen_rndid((unsigned long) ndev);
414 }
415
416 ndev->token = in6addr_any;
417
418 if (netif_running(dev) && addrconf_qdisc_ok(dev))
419 ndev->if_flags |= IF_READY;
420
421 ipv6_mc_init_dev(ndev);
422 ndev->tstamp = jiffies;
423 err = addrconf_sysctl_register(ndev);
424 if (err) {
425 ipv6_mc_destroy_dev(ndev);
426 del_timer(&ndev->regen_timer);
427 snmp6_unregister_dev(ndev);
428 goto err_release;
429 }
430 /* protected by rtnl_lock */
431 rcu_assign_pointer(dev->ip6_ptr, ndev);
432
433 /* Join interface-local all-node multicast group */
434 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
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 err_release:
446 neigh_parms_release(&nd_tbl, ndev->nd_parms);
447 ndev->dead = 1;
448 in6_dev_finish_destroy(ndev);
449 return ERR_PTR(err);
450 }
451
452 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
453 {
454 struct inet6_dev *idev;
455
456 ASSERT_RTNL();
457
458 idev = __in6_dev_get(dev);
459 if (!idev) {
460 idev = ipv6_add_dev(dev);
461 if (IS_ERR(idev))
462 return NULL;
463 }
464
465 if (dev->flags&IFF_UP)
466 ipv6_mc_up(idev);
467 return idev;
468 }
469
470 static int inet6_netconf_msgsize_devconf(int type)
471 {
472 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
473 + nla_total_size(4); /* NETCONFA_IFINDEX */
474
475 /* type -1 is used for ALL */
476 if (type == -1 || type == NETCONFA_FORWARDING)
477 size += nla_total_size(4);
478 #ifdef CONFIG_IPV6_MROUTE
479 if (type == -1 || type == NETCONFA_MC_FORWARDING)
480 size += nla_total_size(4);
481 #endif
482 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
483 size += nla_total_size(4);
484
485 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
486 size += nla_total_size(4);
487
488 return size;
489 }
490
491 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
492 struct ipv6_devconf *devconf, u32 portid,
493 u32 seq, int event, unsigned int flags,
494 int type)
495 {
496 struct nlmsghdr *nlh;
497 struct netconfmsg *ncm;
498
499 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
500 flags);
501 if (!nlh)
502 return -EMSGSIZE;
503
504 ncm = nlmsg_data(nlh);
505 ncm->ncm_family = AF_INET6;
506
507 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
508 goto nla_put_failure;
509
510 /* type -1 is used for ALL */
511 if ((type == -1 || type == NETCONFA_FORWARDING) &&
512 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
513 goto nla_put_failure;
514 #ifdef CONFIG_IPV6_MROUTE
515 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
516 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
517 devconf->mc_forwarding) < 0)
518 goto nla_put_failure;
519 #endif
520 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
521 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
522 goto nla_put_failure;
523
524 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
525 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
526 devconf->ignore_routes_with_linkdown) < 0)
527 goto nla_put_failure;
528
529 nlmsg_end(skb, nlh);
530 return 0;
531
532 nla_put_failure:
533 nlmsg_cancel(skb, nlh);
534 return -EMSGSIZE;
535 }
536
537 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
538 struct ipv6_devconf *devconf)
539 {
540 struct sk_buff *skb;
541 int err = -ENOBUFS;
542
543 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
544 if (!skb)
545 goto errout;
546
547 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
548 RTM_NEWNETCONF, 0, type);
549 if (err < 0) {
550 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
551 WARN_ON(err == -EMSGSIZE);
552 kfree_skb(skb);
553 goto errout;
554 }
555 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
556 return;
557 errout:
558 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
559 }
560
561 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
562 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
563 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
564 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
565 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
566 };
567
568 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
569 struct nlmsghdr *nlh)
570 {
571 struct net *net = sock_net(in_skb->sk);
572 struct nlattr *tb[NETCONFA_MAX+1];
573 struct netconfmsg *ncm;
574 struct sk_buff *skb;
575 struct ipv6_devconf *devconf;
576 struct inet6_dev *in6_dev;
577 struct net_device *dev;
578 int ifindex;
579 int err;
580
581 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
582 devconf_ipv6_policy);
583 if (err < 0)
584 goto errout;
585
586 err = -EINVAL;
587 if (!tb[NETCONFA_IFINDEX])
588 goto errout;
589
590 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
591 switch (ifindex) {
592 case NETCONFA_IFINDEX_ALL:
593 devconf = net->ipv6.devconf_all;
594 break;
595 case NETCONFA_IFINDEX_DEFAULT:
596 devconf = net->ipv6.devconf_dflt;
597 break;
598 default:
599 dev = __dev_get_by_index(net, ifindex);
600 if (!dev)
601 goto errout;
602 in6_dev = __in6_dev_get(dev);
603 if (!in6_dev)
604 goto errout;
605 devconf = &in6_dev->cnf;
606 break;
607 }
608
609 err = -ENOBUFS;
610 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
611 if (!skb)
612 goto errout;
613
614 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
615 NETLINK_CB(in_skb).portid,
616 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
617 -1);
618 if (err < 0) {
619 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
620 WARN_ON(err == -EMSGSIZE);
621 kfree_skb(skb);
622 goto errout;
623 }
624 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
625 errout:
626 return err;
627 }
628
629 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
630 struct netlink_callback *cb)
631 {
632 struct net *net = sock_net(skb->sk);
633 int h, s_h;
634 int idx, s_idx;
635 struct net_device *dev;
636 struct inet6_dev *idev;
637 struct hlist_head *head;
638
639 s_h = cb->args[0];
640 s_idx = idx = cb->args[1];
641
642 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
643 idx = 0;
644 head = &net->dev_index_head[h];
645 rcu_read_lock();
646 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
647 net->dev_base_seq;
648 hlist_for_each_entry_rcu(dev, head, index_hlist) {
649 if (idx < s_idx)
650 goto cont;
651 idev = __in6_dev_get(dev);
652 if (!idev)
653 goto cont;
654
655 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
656 &idev->cnf,
657 NETLINK_CB(cb->skb).portid,
658 cb->nlh->nlmsg_seq,
659 RTM_NEWNETCONF,
660 NLM_F_MULTI,
661 -1) < 0) {
662 rcu_read_unlock();
663 goto done;
664 }
665 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
666 cont:
667 idx++;
668 }
669 rcu_read_unlock();
670 }
671 if (h == NETDEV_HASHENTRIES) {
672 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
673 net->ipv6.devconf_all,
674 NETLINK_CB(cb->skb).portid,
675 cb->nlh->nlmsg_seq,
676 RTM_NEWNETCONF, NLM_F_MULTI,
677 -1) < 0)
678 goto done;
679 else
680 h++;
681 }
682 if (h == NETDEV_HASHENTRIES + 1) {
683 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
684 net->ipv6.devconf_dflt,
685 NETLINK_CB(cb->skb).portid,
686 cb->nlh->nlmsg_seq,
687 RTM_NEWNETCONF, NLM_F_MULTI,
688 -1) < 0)
689 goto done;
690 else
691 h++;
692 }
693 done:
694 cb->args[0] = h;
695 cb->args[1] = idx;
696
697 return skb->len;
698 }
699
700 #ifdef CONFIG_SYSCTL
701 static void dev_forward_change(struct inet6_dev *idev)
702 {
703 struct net_device *dev;
704 struct inet6_ifaddr *ifa;
705
706 if (!idev)
707 return;
708 dev = idev->dev;
709 if (idev->cnf.forwarding)
710 dev_disable_lro(dev);
711 if (dev->flags & IFF_MULTICAST) {
712 if (idev->cnf.forwarding) {
713 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
714 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
715 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
716 } else {
717 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
718 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
719 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
720 }
721 }
722
723 list_for_each_entry(ifa, &idev->addr_list, if_list) {
724 if (ifa->flags&IFA_F_TENTATIVE)
725 continue;
726 if (idev->cnf.forwarding)
727 addrconf_join_anycast(ifa);
728 else
729 addrconf_leave_anycast(ifa);
730 }
731 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
732 dev->ifindex, &idev->cnf);
733 }
734
735
736 static void addrconf_forward_change(struct net *net, __s32 newf)
737 {
738 struct net_device *dev;
739 struct inet6_dev *idev;
740
741 for_each_netdev(net, dev) {
742 idev = __in6_dev_get(dev);
743 if (idev) {
744 int changed = (!idev->cnf.forwarding) ^ (!newf);
745 idev->cnf.forwarding = newf;
746 if (changed)
747 dev_forward_change(idev);
748 }
749 }
750 }
751
752 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
753 {
754 struct net *net;
755 int old;
756
757 if (!rtnl_trylock())
758 return restart_syscall();
759
760 net = (struct net *)table->extra2;
761 old = *p;
762 *p = newf;
763
764 if (p == &net->ipv6.devconf_dflt->forwarding) {
765 if ((!newf) ^ (!old))
766 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
767 NETCONFA_IFINDEX_DEFAULT,
768 net->ipv6.devconf_dflt);
769 rtnl_unlock();
770 return 0;
771 }
772
773 if (p == &net->ipv6.devconf_all->forwarding) {
774 net->ipv6.devconf_dflt->forwarding = newf;
775 addrconf_forward_change(net, newf);
776 if ((!newf) ^ (!old))
777 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
778 NETCONFA_IFINDEX_ALL,
779 net->ipv6.devconf_all);
780 } else if ((!newf) ^ (!old))
781 dev_forward_change((struct inet6_dev *)table->extra1);
782 rtnl_unlock();
783
784 if (newf)
785 rt6_purge_dflt_routers(net);
786 return 1;
787 }
788
789 static void addrconf_linkdown_change(struct net *net, __s32 newf)
790 {
791 struct net_device *dev;
792 struct inet6_dev *idev;
793
794 for_each_netdev(net, dev) {
795 idev = __in6_dev_get(dev);
796 if (idev) {
797 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
798
799 idev->cnf.ignore_routes_with_linkdown = newf;
800 if (changed)
801 inet6_netconf_notify_devconf(dev_net(dev),
802 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
803 dev->ifindex,
804 &idev->cnf);
805 }
806 }
807 }
808
809 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
810 {
811 struct net *net;
812 int old;
813
814 if (!rtnl_trylock())
815 return restart_syscall();
816
817 net = (struct net *)table->extra2;
818 old = *p;
819 *p = newf;
820
821 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
822 if ((!newf) ^ (!old))
823 inet6_netconf_notify_devconf(net,
824 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
825 NETCONFA_IFINDEX_DEFAULT,
826 net->ipv6.devconf_dflt);
827 rtnl_unlock();
828 return 0;
829 }
830
831 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
832 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
833 addrconf_linkdown_change(net, newf);
834 if ((!newf) ^ (!old))
835 inet6_netconf_notify_devconf(net,
836 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
837 NETCONFA_IFINDEX_ALL,
838 net->ipv6.devconf_all);
839 }
840 rtnl_unlock();
841
842 return 1;
843 }
844
845 #endif
846
847 /* Nobody refers to this ifaddr, destroy it */
848 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
849 {
850 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
851
852 #ifdef NET_REFCNT_DEBUG
853 pr_debug("%s\n", __func__);
854 #endif
855
856 in6_dev_put(ifp->idev);
857
858 if (cancel_delayed_work(&ifp->dad_work))
859 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
860 ifp);
861
862 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
863 pr_warn("Freeing alive inet6 address %p\n", ifp);
864 return;
865 }
866 ip6_rt_put(ifp->rt);
867
868 kfree_rcu(ifp, rcu);
869 }
870
871 static void
872 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
873 {
874 struct list_head *p;
875 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
876
877 /*
878 * Each device address list is sorted in order of scope -
879 * global before linklocal.
880 */
881 list_for_each(p, &idev->addr_list) {
882 struct inet6_ifaddr *ifa
883 = list_entry(p, struct inet6_ifaddr, if_list);
884 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
885 break;
886 }
887
888 list_add_tail(&ifp->if_list, p);
889 }
890
891 static u32 inet6_addr_hash(const struct in6_addr *addr)
892 {
893 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
894 }
895
896 /* On success it returns ifp with increased reference count */
897
898 static struct inet6_ifaddr *
899 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
900 const struct in6_addr *peer_addr, int pfxlen,
901 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
902 {
903 struct inet6_ifaddr *ifa = NULL;
904 struct rt6_info *rt;
905 unsigned int hash;
906 int err = 0;
907 int addr_type = ipv6_addr_type(addr);
908
909 if (addr_type == IPV6_ADDR_ANY ||
910 addr_type & IPV6_ADDR_MULTICAST ||
911 (!(idev->dev->flags & IFF_LOOPBACK) &&
912 addr_type & IPV6_ADDR_LOOPBACK))
913 return ERR_PTR(-EADDRNOTAVAIL);
914
915 rcu_read_lock_bh();
916 if (idev->dead) {
917 err = -ENODEV; /*XXX*/
918 goto out2;
919 }
920
921 if (idev->cnf.disable_ipv6) {
922 err = -EACCES;
923 goto out2;
924 }
925
926 spin_lock(&addrconf_hash_lock);
927
928 /* Ignore adding duplicate addresses on an interface */
929 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
930 ADBG("ipv6_add_addr: already assigned\n");
931 err = -EEXIST;
932 goto out;
933 }
934
935 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
936
937 if (!ifa) {
938 ADBG("ipv6_add_addr: malloc failed\n");
939 err = -ENOBUFS;
940 goto out;
941 }
942
943 rt = addrconf_dst_alloc(idev, addr, false);
944 if (IS_ERR(rt)) {
945 err = PTR_ERR(rt);
946 goto out;
947 }
948
949 neigh_parms_data_state_setall(idev->nd_parms);
950
951 ifa->addr = *addr;
952 if (peer_addr)
953 ifa->peer_addr = *peer_addr;
954
955 spin_lock_init(&ifa->lock);
956 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
957 INIT_HLIST_NODE(&ifa->addr_lst);
958 ifa->scope = scope;
959 ifa->prefix_len = pfxlen;
960 ifa->flags = flags | IFA_F_TENTATIVE;
961 ifa->valid_lft = valid_lft;
962 ifa->prefered_lft = prefered_lft;
963 ifa->cstamp = ifa->tstamp = jiffies;
964 ifa->tokenized = false;
965
966 ifa->rt = rt;
967
968 ifa->idev = idev;
969 in6_dev_hold(idev);
970 /* For caller */
971 in6_ifa_hold(ifa);
972
973 /* Add to big hash table */
974 hash = inet6_addr_hash(addr);
975
976 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
977 spin_unlock(&addrconf_hash_lock);
978
979 write_lock(&idev->lock);
980 /* Add to inet6_dev unicast addr list. */
981 ipv6_link_dev_addr(idev, ifa);
982
983 if (ifa->flags&IFA_F_TEMPORARY) {
984 list_add(&ifa->tmp_list, &idev->tempaddr_list);
985 in6_ifa_hold(ifa);
986 }
987
988 in6_ifa_hold(ifa);
989 write_unlock(&idev->lock);
990 out2:
991 rcu_read_unlock_bh();
992
993 if (likely(err == 0))
994 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
995 else {
996 kfree(ifa);
997 ifa = ERR_PTR(err);
998 }
999
1000 return ifa;
1001 out:
1002 spin_unlock(&addrconf_hash_lock);
1003 goto out2;
1004 }
1005
1006 enum cleanup_prefix_rt_t {
1007 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1008 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1009 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1010 };
1011
1012 /*
1013 * Check, whether the prefix for ifp would still need a prefix route
1014 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1015 * constants.
1016 *
1017 * 1) we don't purge prefix if address was not permanent.
1018 * prefix is managed by its own lifetime.
1019 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1020 * 3) if there are no addresses, delete prefix.
1021 * 4) if there are still other permanent address(es),
1022 * corresponding prefix is still permanent.
1023 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1024 * don't purge the prefix, assume user space is managing it.
1025 * 6) otherwise, update prefix lifetime to the
1026 * longest valid lifetime among the corresponding
1027 * addresses on the device.
1028 * Note: subsequent RA will update lifetime.
1029 **/
1030 static enum cleanup_prefix_rt_t
1031 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1032 {
1033 struct inet6_ifaddr *ifa;
1034 struct inet6_dev *idev = ifp->idev;
1035 unsigned long lifetime;
1036 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1037
1038 *expires = jiffies;
1039
1040 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1041 if (ifa == ifp)
1042 continue;
1043 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1044 ifp->prefix_len))
1045 continue;
1046 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1047 return CLEANUP_PREFIX_RT_NOP;
1048
1049 action = CLEANUP_PREFIX_RT_EXPIRE;
1050
1051 spin_lock(&ifa->lock);
1052
1053 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1054 /*
1055 * Note: Because this address is
1056 * not permanent, lifetime <
1057 * LONG_MAX / HZ here.
1058 */
1059 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1060 *expires = ifa->tstamp + lifetime * HZ;
1061 spin_unlock(&ifa->lock);
1062 }
1063
1064 return action;
1065 }
1066
1067 static void
1068 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1069 {
1070 struct rt6_info *rt;
1071
1072 rt = addrconf_get_prefix_route(&ifp->addr,
1073 ifp->prefix_len,
1074 ifp->idev->dev,
1075 0, RTF_GATEWAY | RTF_DEFAULT);
1076 if (rt) {
1077 if (del_rt)
1078 ip6_del_rt(rt);
1079 else {
1080 if (!(rt->rt6i_flags & RTF_EXPIRES))
1081 rt6_set_expires(rt, expires);
1082 ip6_rt_put(rt);
1083 }
1084 }
1085 }
1086
1087
1088 /* This function wants to get referenced ifp and releases it before return */
1089
1090 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1091 {
1092 int state;
1093 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1094 unsigned long expires;
1095
1096 ASSERT_RTNL();
1097
1098 spin_lock_bh(&ifp->lock);
1099 state = ifp->state;
1100 ifp->state = INET6_IFADDR_STATE_DEAD;
1101 spin_unlock_bh(&ifp->lock);
1102
1103 if (state == INET6_IFADDR_STATE_DEAD)
1104 goto out;
1105
1106 spin_lock_bh(&addrconf_hash_lock);
1107 hlist_del_init_rcu(&ifp->addr_lst);
1108 spin_unlock_bh(&addrconf_hash_lock);
1109
1110 write_lock_bh(&ifp->idev->lock);
1111
1112 if (ifp->flags&IFA_F_TEMPORARY) {
1113 list_del(&ifp->tmp_list);
1114 if (ifp->ifpub) {
1115 in6_ifa_put(ifp->ifpub);
1116 ifp->ifpub = NULL;
1117 }
1118 __in6_ifa_put(ifp);
1119 }
1120
1121 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1122 action = check_cleanup_prefix_route(ifp, &expires);
1123
1124 list_del_init(&ifp->if_list);
1125 __in6_ifa_put(ifp);
1126
1127 write_unlock_bh(&ifp->idev->lock);
1128
1129 addrconf_del_dad_work(ifp);
1130
1131 ipv6_ifa_notify(RTM_DELADDR, ifp);
1132
1133 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1134
1135 if (action != CLEANUP_PREFIX_RT_NOP) {
1136 cleanup_prefix_route(ifp, expires,
1137 action == CLEANUP_PREFIX_RT_DEL);
1138 }
1139
1140 /* clean up prefsrc entries */
1141 rt6_remove_prefsrc(ifp);
1142 out:
1143 in6_ifa_put(ifp);
1144 }
1145
1146 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1147 {
1148 struct inet6_dev *idev = ifp->idev;
1149 struct in6_addr addr, *tmpaddr;
1150 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1151 unsigned long regen_advance;
1152 int tmp_plen;
1153 int ret = 0;
1154 u32 addr_flags;
1155 unsigned long now = jiffies;
1156
1157 write_lock_bh(&idev->lock);
1158 if (ift) {
1159 spin_lock_bh(&ift->lock);
1160 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1161 spin_unlock_bh(&ift->lock);
1162 tmpaddr = &addr;
1163 } else {
1164 tmpaddr = NULL;
1165 }
1166 retry:
1167 in6_dev_hold(idev);
1168 if (idev->cnf.use_tempaddr <= 0) {
1169 write_unlock_bh(&idev->lock);
1170 pr_info("%s: use_tempaddr is disabled\n", __func__);
1171 in6_dev_put(idev);
1172 ret = -1;
1173 goto out;
1174 }
1175 spin_lock_bh(&ifp->lock);
1176 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1177 idev->cnf.use_tempaddr = -1; /*XXX*/
1178 spin_unlock_bh(&ifp->lock);
1179 write_unlock_bh(&idev->lock);
1180 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1181 __func__);
1182 in6_dev_put(idev);
1183 ret = -1;
1184 goto out;
1185 }
1186 in6_ifa_hold(ifp);
1187 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1188 __ipv6_try_regen_rndid(idev, tmpaddr);
1189 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1190 age = (now - ifp->tstamp) / HZ;
1191 tmp_valid_lft = min_t(__u32,
1192 ifp->valid_lft,
1193 idev->cnf.temp_valid_lft + age);
1194 tmp_prefered_lft = min_t(__u32,
1195 ifp->prefered_lft,
1196 idev->cnf.temp_prefered_lft + age -
1197 idev->cnf.max_desync_factor);
1198 tmp_plen = ifp->prefix_len;
1199 tmp_tstamp = ifp->tstamp;
1200 spin_unlock_bh(&ifp->lock);
1201
1202 regen_advance = idev->cnf.regen_max_retry *
1203 idev->cnf.dad_transmits *
1204 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1205 write_unlock_bh(&idev->lock);
1206
1207 /* A temporary address is created only if this calculated Preferred
1208 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1209 * an implementation must not create a temporary address with a zero
1210 * Preferred Lifetime.
1211 * Use age calculation as in addrconf_verify to avoid unnecessary
1212 * temporary addresses being generated.
1213 */
1214 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1215 if (tmp_prefered_lft <= regen_advance + age) {
1216 in6_ifa_put(ifp);
1217 in6_dev_put(idev);
1218 ret = -1;
1219 goto out;
1220 }
1221
1222 addr_flags = IFA_F_TEMPORARY;
1223 /* set in addrconf_prefix_rcv() */
1224 if (ifp->flags & IFA_F_OPTIMISTIC)
1225 addr_flags |= IFA_F_OPTIMISTIC;
1226
1227 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1228 ipv6_addr_scope(&addr), addr_flags,
1229 tmp_valid_lft, tmp_prefered_lft);
1230 if (IS_ERR(ift)) {
1231 in6_ifa_put(ifp);
1232 in6_dev_put(idev);
1233 pr_info("%s: retry temporary address regeneration\n", __func__);
1234 tmpaddr = &addr;
1235 write_lock_bh(&idev->lock);
1236 goto retry;
1237 }
1238
1239 spin_lock_bh(&ift->lock);
1240 ift->ifpub = ifp;
1241 ift->cstamp = now;
1242 ift->tstamp = tmp_tstamp;
1243 spin_unlock_bh(&ift->lock);
1244
1245 addrconf_dad_start(ift);
1246 in6_ifa_put(ift);
1247 in6_dev_put(idev);
1248 out:
1249 return ret;
1250 }
1251
1252 /*
1253 * Choose an appropriate source address (RFC3484)
1254 */
1255 enum {
1256 IPV6_SADDR_RULE_INIT = 0,
1257 IPV6_SADDR_RULE_LOCAL,
1258 IPV6_SADDR_RULE_SCOPE,
1259 IPV6_SADDR_RULE_PREFERRED,
1260 #ifdef CONFIG_IPV6_MIP6
1261 IPV6_SADDR_RULE_HOA,
1262 #endif
1263 IPV6_SADDR_RULE_OIF,
1264 IPV6_SADDR_RULE_LABEL,
1265 IPV6_SADDR_RULE_PRIVACY,
1266 IPV6_SADDR_RULE_ORCHID,
1267 IPV6_SADDR_RULE_PREFIX,
1268 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1269 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1270 #endif
1271 IPV6_SADDR_RULE_MAX
1272 };
1273
1274 struct ipv6_saddr_score {
1275 int rule;
1276 int addr_type;
1277 struct inet6_ifaddr *ifa;
1278 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1279 int scopedist;
1280 int matchlen;
1281 };
1282
1283 struct ipv6_saddr_dst {
1284 const struct in6_addr *addr;
1285 int ifindex;
1286 int scope;
1287 int label;
1288 unsigned int prefs;
1289 };
1290
1291 static inline int ipv6_saddr_preferred(int type)
1292 {
1293 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1294 return 1;
1295 return 0;
1296 }
1297
1298 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1299 {
1300 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1301 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1302 #else
1303 return false;
1304 #endif
1305 }
1306
1307 static int ipv6_get_saddr_eval(struct net *net,
1308 struct ipv6_saddr_score *score,
1309 struct ipv6_saddr_dst *dst,
1310 int i)
1311 {
1312 int ret;
1313
1314 if (i <= score->rule) {
1315 switch (i) {
1316 case IPV6_SADDR_RULE_SCOPE:
1317 ret = score->scopedist;
1318 break;
1319 case IPV6_SADDR_RULE_PREFIX:
1320 ret = score->matchlen;
1321 break;
1322 default:
1323 ret = !!test_bit(i, score->scorebits);
1324 }
1325 goto out;
1326 }
1327
1328 switch (i) {
1329 case IPV6_SADDR_RULE_INIT:
1330 /* Rule 0: remember if hiscore is not ready yet */
1331 ret = !!score->ifa;
1332 break;
1333 case IPV6_SADDR_RULE_LOCAL:
1334 /* Rule 1: Prefer same address */
1335 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1336 break;
1337 case IPV6_SADDR_RULE_SCOPE:
1338 /* Rule 2: Prefer appropriate scope
1339 *
1340 * ret
1341 * ^
1342 * -1 | d 15
1343 * ---+--+-+---> scope
1344 * |
1345 * | d is scope of the destination.
1346 * B-d | \
1347 * | \ <- smaller scope is better if
1348 * B-15 | \ if scope is enough for destination.
1349 * | ret = B - scope (-1 <= scope >= d <= 15).
1350 * d-C-1 | /
1351 * |/ <- greater is better
1352 * -C / if scope is not enough for destination.
1353 * /| ret = scope - C (-1 <= d < scope <= 15).
1354 *
1355 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1356 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1357 * Assume B = 0 and we get C > 29.
1358 */
1359 ret = __ipv6_addr_src_scope(score->addr_type);
1360 if (ret >= dst->scope)
1361 ret = -ret;
1362 else
1363 ret -= 128; /* 30 is enough */
1364 score->scopedist = ret;
1365 break;
1366 case IPV6_SADDR_RULE_PREFERRED:
1367 {
1368 /* Rule 3: Avoid deprecated and optimistic addresses */
1369 u8 avoid = IFA_F_DEPRECATED;
1370
1371 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1372 avoid |= IFA_F_OPTIMISTIC;
1373 ret = ipv6_saddr_preferred(score->addr_type) ||
1374 !(score->ifa->flags & avoid);
1375 break;
1376 }
1377 #ifdef CONFIG_IPV6_MIP6
1378 case IPV6_SADDR_RULE_HOA:
1379 {
1380 /* Rule 4: Prefer home address */
1381 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1382 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1383 break;
1384 }
1385 #endif
1386 case IPV6_SADDR_RULE_OIF:
1387 /* Rule 5: Prefer outgoing interface */
1388 ret = (!dst->ifindex ||
1389 dst->ifindex == score->ifa->idev->dev->ifindex);
1390 break;
1391 case IPV6_SADDR_RULE_LABEL:
1392 /* Rule 6: Prefer matching label */
1393 ret = ipv6_addr_label(net,
1394 &score->ifa->addr, score->addr_type,
1395 score->ifa->idev->dev->ifindex) == dst->label;
1396 break;
1397 case IPV6_SADDR_RULE_PRIVACY:
1398 {
1399 /* Rule 7: Prefer public address
1400 * Note: prefer temporary address if use_tempaddr >= 2
1401 */
1402 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1403 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1404 score->ifa->idev->cnf.use_tempaddr >= 2;
1405 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1406 break;
1407 }
1408 case IPV6_SADDR_RULE_ORCHID:
1409 /* Rule 8-: Prefer ORCHID vs ORCHID or
1410 * non-ORCHID vs non-ORCHID
1411 */
1412 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1413 ipv6_addr_orchid(dst->addr));
1414 break;
1415 case IPV6_SADDR_RULE_PREFIX:
1416 /* Rule 8: Use longest matching prefix */
1417 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1418 if (ret > score->ifa->prefix_len)
1419 ret = score->ifa->prefix_len;
1420 score->matchlen = ret;
1421 break;
1422 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1423 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1424 /* Optimistic addresses still have lower precedence than other
1425 * preferred addresses.
1426 */
1427 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1428 break;
1429 #endif
1430 default:
1431 ret = 0;
1432 }
1433
1434 if (ret)
1435 __set_bit(i, score->scorebits);
1436 score->rule = i;
1437 out:
1438 return ret;
1439 }
1440
1441 static int __ipv6_dev_get_saddr(struct net *net,
1442 struct ipv6_saddr_dst *dst,
1443 struct inet6_dev *idev,
1444 struct ipv6_saddr_score *scores,
1445 int hiscore_idx)
1446 {
1447 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1448
1449 read_lock_bh(&idev->lock);
1450 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1451 int i;
1452
1453 /*
1454 * - Tentative Address (RFC2462 section 5.4)
1455 * - A tentative address is not considered
1456 * "assigned to an interface" in the traditional
1457 * sense, unless it is also flagged as optimistic.
1458 * - Candidate Source Address (section 4)
1459 * - In any case, anycast addresses, multicast
1460 * addresses, and the unspecified address MUST
1461 * NOT be included in a candidate set.
1462 */
1463 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1464 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1465 continue;
1466
1467 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1468
1469 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1470 score->addr_type & IPV6_ADDR_MULTICAST)) {
1471 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1472 idev->dev->name);
1473 continue;
1474 }
1475
1476 score->rule = -1;
1477 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1478
1479 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1480 int minihiscore, miniscore;
1481
1482 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1483 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1484
1485 if (minihiscore > miniscore) {
1486 if (i == IPV6_SADDR_RULE_SCOPE &&
1487 score->scopedist > 0) {
1488 /*
1489 * special case:
1490 * each remaining entry
1491 * has too small (not enough)
1492 * scope, because ifa entries
1493 * are sorted by their scope
1494 * values.
1495 */
1496 goto out;
1497 }
1498 break;
1499 } else if (minihiscore < miniscore) {
1500 if (hiscore->ifa)
1501 in6_ifa_put(hiscore->ifa);
1502
1503 in6_ifa_hold(score->ifa);
1504
1505 swap(hiscore, score);
1506 hiscore_idx = 1 - hiscore_idx;
1507
1508 /* restore our iterator */
1509 score->ifa = hiscore->ifa;
1510
1511 break;
1512 }
1513 }
1514 }
1515 out:
1516 read_unlock_bh(&idev->lock);
1517 return hiscore_idx;
1518 }
1519
1520 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1521 const struct in6_addr *daddr, unsigned int prefs,
1522 struct in6_addr *saddr)
1523 {
1524 struct ipv6_saddr_score scores[2], *hiscore;
1525 struct ipv6_saddr_dst dst;
1526 struct inet6_dev *idev;
1527 struct net_device *dev;
1528 int dst_type;
1529 bool use_oif_addr = false;
1530 int hiscore_idx = 0;
1531
1532 dst_type = __ipv6_addr_type(daddr);
1533 dst.addr = daddr;
1534 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1535 dst.scope = __ipv6_addr_src_scope(dst_type);
1536 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1537 dst.prefs = prefs;
1538
1539 scores[hiscore_idx].rule = -1;
1540 scores[hiscore_idx].ifa = NULL;
1541
1542 rcu_read_lock();
1543
1544 /* Candidate Source Address (section 4)
1545 * - multicast and link-local destination address,
1546 * the set of candidate source address MUST only
1547 * include addresses assigned to interfaces
1548 * belonging to the same link as the outgoing
1549 * interface.
1550 * (- For site-local destination addresses, the
1551 * set of candidate source addresses MUST only
1552 * include addresses assigned to interfaces
1553 * belonging to the same site as the outgoing
1554 * interface.)
1555 * - "It is RECOMMENDED that the candidate source addresses
1556 * be the set of unicast addresses assigned to the
1557 * interface that will be used to send to the destination
1558 * (the 'outgoing' interface)." (RFC 6724)
1559 */
1560 if (dst_dev) {
1561 idev = __in6_dev_get(dst_dev);
1562 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1563 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1564 (idev && idev->cnf.use_oif_addrs_only)) {
1565 use_oif_addr = true;
1566 }
1567 }
1568
1569 if (use_oif_addr) {
1570 if (idev)
1571 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1572 } else {
1573 for_each_netdev_rcu(net, dev) {
1574 idev = __in6_dev_get(dev);
1575 if (!idev)
1576 continue;
1577 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1578 }
1579 }
1580 rcu_read_unlock();
1581
1582 hiscore = &scores[hiscore_idx];
1583 if (!hiscore->ifa)
1584 return -EADDRNOTAVAIL;
1585
1586 *saddr = hiscore->ifa->addr;
1587 in6_ifa_put(hiscore->ifa);
1588 return 0;
1589 }
1590 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1591
1592 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1593 u32 banned_flags)
1594 {
1595 struct inet6_ifaddr *ifp;
1596 int err = -EADDRNOTAVAIL;
1597
1598 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1599 if (ifp->scope > IFA_LINK)
1600 break;
1601 if (ifp->scope == IFA_LINK &&
1602 !(ifp->flags & banned_flags)) {
1603 *addr = ifp->addr;
1604 err = 0;
1605 break;
1606 }
1607 }
1608 return err;
1609 }
1610
1611 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1612 u32 banned_flags)
1613 {
1614 struct inet6_dev *idev;
1615 int err = -EADDRNOTAVAIL;
1616
1617 rcu_read_lock();
1618 idev = __in6_dev_get(dev);
1619 if (idev) {
1620 read_lock_bh(&idev->lock);
1621 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1622 read_unlock_bh(&idev->lock);
1623 }
1624 rcu_read_unlock();
1625 return err;
1626 }
1627
1628 static int ipv6_count_addresses(struct inet6_dev *idev)
1629 {
1630 int cnt = 0;
1631 struct inet6_ifaddr *ifp;
1632
1633 read_lock_bh(&idev->lock);
1634 list_for_each_entry(ifp, &idev->addr_list, if_list)
1635 cnt++;
1636 read_unlock_bh(&idev->lock);
1637 return cnt;
1638 }
1639
1640 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1641 const struct net_device *dev, int strict)
1642 {
1643 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1644 }
1645 EXPORT_SYMBOL(ipv6_chk_addr);
1646
1647 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1648 const struct net_device *dev, int strict,
1649 u32 banned_flags)
1650 {
1651 struct inet6_ifaddr *ifp;
1652 unsigned int hash = inet6_addr_hash(addr);
1653 u32 ifp_flags;
1654
1655 rcu_read_lock_bh();
1656 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1657 if (!net_eq(dev_net(ifp->idev->dev), net))
1658 continue;
1659 /* Decouple optimistic from tentative for evaluation here.
1660 * Ban optimistic addresses explicitly, when required.
1661 */
1662 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1663 ? (ifp->flags&~IFA_F_TENTATIVE)
1664 : ifp->flags;
1665 if (ipv6_addr_equal(&ifp->addr, addr) &&
1666 !(ifp_flags&banned_flags) &&
1667 (!dev || ifp->idev->dev == dev ||
1668 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1669 rcu_read_unlock_bh();
1670 return 1;
1671 }
1672 }
1673
1674 rcu_read_unlock_bh();
1675 return 0;
1676 }
1677 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1678
1679 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1680 struct net_device *dev)
1681 {
1682 unsigned int hash = inet6_addr_hash(addr);
1683 struct inet6_ifaddr *ifp;
1684
1685 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1686 if (!net_eq(dev_net(ifp->idev->dev), net))
1687 continue;
1688 if (ipv6_addr_equal(&ifp->addr, addr)) {
1689 if (!dev || ifp->idev->dev == dev)
1690 return true;
1691 }
1692 }
1693 return false;
1694 }
1695
1696 /* Compares an address/prefix_len with addresses on device @dev.
1697 * If one is found it returns true.
1698 */
1699 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1700 const unsigned int prefix_len, struct net_device *dev)
1701 {
1702 struct inet6_dev *idev;
1703 struct inet6_ifaddr *ifa;
1704 bool ret = false;
1705
1706 rcu_read_lock();
1707 idev = __in6_dev_get(dev);
1708 if (idev) {
1709 read_lock_bh(&idev->lock);
1710 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1711 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1712 if (ret)
1713 break;
1714 }
1715 read_unlock_bh(&idev->lock);
1716 }
1717 rcu_read_unlock();
1718
1719 return ret;
1720 }
1721 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1722
1723 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1724 {
1725 struct inet6_dev *idev;
1726 struct inet6_ifaddr *ifa;
1727 int onlink;
1728
1729 onlink = 0;
1730 rcu_read_lock();
1731 idev = __in6_dev_get(dev);
1732 if (idev) {
1733 read_lock_bh(&idev->lock);
1734 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1735 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1736 ifa->prefix_len);
1737 if (onlink)
1738 break;
1739 }
1740 read_unlock_bh(&idev->lock);
1741 }
1742 rcu_read_unlock();
1743 return onlink;
1744 }
1745 EXPORT_SYMBOL(ipv6_chk_prefix);
1746
1747 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1748 struct net_device *dev, int strict)
1749 {
1750 struct inet6_ifaddr *ifp, *result = NULL;
1751 unsigned int hash = inet6_addr_hash(addr);
1752
1753 rcu_read_lock_bh();
1754 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1755 if (!net_eq(dev_net(ifp->idev->dev), net))
1756 continue;
1757 if (ipv6_addr_equal(&ifp->addr, addr)) {
1758 if (!dev || ifp->idev->dev == dev ||
1759 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1760 result = ifp;
1761 in6_ifa_hold(ifp);
1762 break;
1763 }
1764 }
1765 }
1766 rcu_read_unlock_bh();
1767
1768 return result;
1769 }
1770
1771 /* Gets referenced address, destroys ifaddr */
1772
1773 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1774 {
1775 if (dad_failed)
1776 ifp->flags |= IFA_F_DADFAILED;
1777
1778 if (ifp->flags&IFA_F_PERMANENT) {
1779 spin_lock_bh(&ifp->lock);
1780 addrconf_del_dad_work(ifp);
1781 ifp->flags |= IFA_F_TENTATIVE;
1782 spin_unlock_bh(&ifp->lock);
1783 if (dad_failed)
1784 ipv6_ifa_notify(0, ifp);
1785 in6_ifa_put(ifp);
1786 } else if (ifp->flags&IFA_F_TEMPORARY) {
1787 struct inet6_ifaddr *ifpub;
1788 spin_lock_bh(&ifp->lock);
1789 ifpub = ifp->ifpub;
1790 if (ifpub) {
1791 in6_ifa_hold(ifpub);
1792 spin_unlock_bh(&ifp->lock);
1793 ipv6_create_tempaddr(ifpub, ifp);
1794 in6_ifa_put(ifpub);
1795 } else {
1796 spin_unlock_bh(&ifp->lock);
1797 }
1798 ipv6_del_addr(ifp);
1799 } else {
1800 ipv6_del_addr(ifp);
1801 }
1802 }
1803
1804 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1805 {
1806 int err = -ENOENT;
1807
1808 spin_lock_bh(&ifp->lock);
1809 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1810 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1811 err = 0;
1812 }
1813 spin_unlock_bh(&ifp->lock);
1814
1815 return err;
1816 }
1817
1818 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1819 {
1820 struct in6_addr addr;
1821 struct inet6_dev *idev = ifp->idev;
1822 struct net *net = dev_net(ifp->idev->dev);
1823
1824 if (addrconf_dad_end(ifp)) {
1825 in6_ifa_put(ifp);
1826 return;
1827 }
1828
1829 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1830 ifp->idev->dev->name, &ifp->addr);
1831
1832 spin_lock_bh(&ifp->lock);
1833
1834 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1835 int scope = ifp->scope;
1836 u32 flags = ifp->flags;
1837 struct in6_addr new_addr;
1838 struct inet6_ifaddr *ifp2;
1839 u32 valid_lft, preferred_lft;
1840 int pfxlen = ifp->prefix_len;
1841 int retries = ifp->stable_privacy_retry + 1;
1842
1843 if (retries > net->ipv6.sysctl.idgen_retries) {
1844 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1845 ifp->idev->dev->name);
1846 goto errdad;
1847 }
1848
1849 new_addr = ifp->addr;
1850 if (ipv6_generate_stable_address(&new_addr, retries,
1851 idev))
1852 goto errdad;
1853
1854 valid_lft = ifp->valid_lft;
1855 preferred_lft = ifp->prefered_lft;
1856
1857 spin_unlock_bh(&ifp->lock);
1858
1859 if (idev->cnf.max_addresses &&
1860 ipv6_count_addresses(idev) >=
1861 idev->cnf.max_addresses)
1862 goto lock_errdad;
1863
1864 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1865 ifp->idev->dev->name);
1866
1867 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1868 scope, flags, valid_lft,
1869 preferred_lft);
1870 if (IS_ERR(ifp2))
1871 goto lock_errdad;
1872
1873 spin_lock_bh(&ifp2->lock);
1874 ifp2->stable_privacy_retry = retries;
1875 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1876 spin_unlock_bh(&ifp2->lock);
1877
1878 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1879 in6_ifa_put(ifp2);
1880 lock_errdad:
1881 spin_lock_bh(&ifp->lock);
1882 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1883 addr.s6_addr32[0] = htonl(0xfe800000);
1884 addr.s6_addr32[1] = 0;
1885
1886 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1887 ipv6_addr_equal(&ifp->addr, &addr)) {
1888 /* DAD failed for link-local based on MAC address */
1889 idev->cnf.disable_ipv6 = 1;
1890
1891 pr_info("%s: IPv6 being disabled!\n",
1892 ifp->idev->dev->name);
1893 }
1894 }
1895
1896 errdad:
1897 /* transition from _POSTDAD to _ERRDAD */
1898 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1899 spin_unlock_bh(&ifp->lock);
1900
1901 addrconf_mod_dad_work(ifp, 0);
1902 }
1903
1904 /* Join to solicited addr multicast group.
1905 * caller must hold RTNL */
1906 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1907 {
1908 struct in6_addr maddr;
1909
1910 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1911 return;
1912
1913 addrconf_addr_solict_mult(addr, &maddr);
1914 ipv6_dev_mc_inc(dev, &maddr);
1915 }
1916
1917 /* caller must hold RTNL */
1918 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1919 {
1920 struct in6_addr maddr;
1921
1922 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1923 return;
1924
1925 addrconf_addr_solict_mult(addr, &maddr);
1926 __ipv6_dev_mc_dec(idev, &maddr);
1927 }
1928
1929 /* caller must hold RTNL */
1930 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1931 {
1932 struct in6_addr addr;
1933
1934 if (ifp->prefix_len >= 127) /* RFC 6164 */
1935 return;
1936 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1937 if (ipv6_addr_any(&addr))
1938 return;
1939 __ipv6_dev_ac_inc(ifp->idev, &addr);
1940 }
1941
1942 /* caller must hold RTNL */
1943 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1944 {
1945 struct in6_addr addr;
1946
1947 if (ifp->prefix_len >= 127) /* RFC 6164 */
1948 return;
1949 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1950 if (ipv6_addr_any(&addr))
1951 return;
1952 __ipv6_dev_ac_dec(ifp->idev, &addr);
1953 }
1954
1955 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1956 {
1957 if (dev->addr_len != EUI64_ADDR_LEN)
1958 return -1;
1959 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
1960 eui[0] ^= 2;
1961 return 0;
1962 }
1963
1964 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1965 {
1966 union fwnet_hwaddr *ha;
1967
1968 if (dev->addr_len != FWNET_ALEN)
1969 return -1;
1970
1971 ha = (union fwnet_hwaddr *)dev->dev_addr;
1972
1973 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1974 eui[0] ^= 2;
1975 return 0;
1976 }
1977
1978 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1979 {
1980 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1981 if (dev->addr_len != ARCNET_ALEN)
1982 return -1;
1983 memset(eui, 0, 7);
1984 eui[7] = *(u8 *)dev->dev_addr;
1985 return 0;
1986 }
1987
1988 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1989 {
1990 if (dev->addr_len != INFINIBAND_ALEN)
1991 return -1;
1992 memcpy(eui, dev->dev_addr + 12, 8);
1993 eui[0] |= 2;
1994 return 0;
1995 }
1996
1997 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1998 {
1999 if (addr == 0)
2000 return -1;
2001 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2002 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2003 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2004 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2005 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2006 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2007 eui[1] = 0;
2008 eui[2] = 0x5E;
2009 eui[3] = 0xFE;
2010 memcpy(eui + 4, &addr, 4);
2011 return 0;
2012 }
2013
2014 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2015 {
2016 if (dev->priv_flags & IFF_ISATAP)
2017 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2018 return -1;
2019 }
2020
2021 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2022 {
2023 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2024 }
2025
2026 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2027 {
2028 memcpy(eui, dev->perm_addr, 3);
2029 memcpy(eui + 5, dev->perm_addr + 3, 3);
2030 eui[3] = 0xFF;
2031 eui[4] = 0xFE;
2032 eui[0] ^= 2;
2033 return 0;
2034 }
2035
2036 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2037 {
2038 switch (dev->type) {
2039 case ARPHRD_ETHER:
2040 case ARPHRD_FDDI:
2041 return addrconf_ifid_eui48(eui, dev);
2042 case ARPHRD_ARCNET:
2043 return addrconf_ifid_arcnet(eui, dev);
2044 case ARPHRD_INFINIBAND:
2045 return addrconf_ifid_infiniband(eui, dev);
2046 case ARPHRD_SIT:
2047 return addrconf_ifid_sit(eui, dev);
2048 case ARPHRD_IPGRE:
2049 return addrconf_ifid_gre(eui, dev);
2050 case ARPHRD_6LOWPAN:
2051 return addrconf_ifid_eui64(eui, dev);
2052 case ARPHRD_IEEE1394:
2053 return addrconf_ifid_ieee1394(eui, dev);
2054 case ARPHRD_TUNNEL6:
2055 return addrconf_ifid_ip6tnl(eui, dev);
2056 }
2057 return -1;
2058 }
2059
2060 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2061 {
2062 int err = -1;
2063 struct inet6_ifaddr *ifp;
2064
2065 read_lock_bh(&idev->lock);
2066 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2067 if (ifp->scope > IFA_LINK)
2068 break;
2069 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2070 memcpy(eui, ifp->addr.s6_addr+8, 8);
2071 err = 0;
2072 break;
2073 }
2074 }
2075 read_unlock_bh(&idev->lock);
2076 return err;
2077 }
2078
2079 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2080 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2081 {
2082 regen:
2083 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2084 idev->rndid[0] &= ~0x02;
2085
2086 /*
2087 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2088 * check if generated address is not inappropriate
2089 *
2090 * - Reserved subnet anycast (RFC 2526)
2091 * 11111101 11....11 1xxxxxxx
2092 * - ISATAP (RFC4214) 6.1
2093 * 00-00-5E-FE-xx-xx-xx-xx
2094 * - value 0
2095 * - XXX: already assigned to an address on the device
2096 */
2097 if (idev->rndid[0] == 0xfd &&
2098 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2099 (idev->rndid[7]&0x80))
2100 goto regen;
2101 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2102 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2103 goto regen;
2104 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2105 goto regen;
2106 }
2107 }
2108
2109 static void ipv6_regen_rndid(unsigned long data)
2110 {
2111 struct inet6_dev *idev = (struct inet6_dev *) data;
2112 unsigned long expires;
2113
2114 rcu_read_lock_bh();
2115 write_lock_bh(&idev->lock);
2116
2117 if (idev->dead)
2118 goto out;
2119
2120 __ipv6_regen_rndid(idev);
2121
2122 expires = jiffies +
2123 idev->cnf.temp_prefered_lft * HZ -
2124 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2125 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2126 idev->cnf.max_desync_factor * HZ;
2127 if (time_before(expires, jiffies)) {
2128 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2129 __func__, idev->dev->name);
2130 goto out;
2131 }
2132
2133 if (!mod_timer(&idev->regen_timer, expires))
2134 in6_dev_hold(idev);
2135
2136 out:
2137 write_unlock_bh(&idev->lock);
2138 rcu_read_unlock_bh();
2139 in6_dev_put(idev);
2140 }
2141
2142 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2143 {
2144 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2145 __ipv6_regen_rndid(idev);
2146 }
2147
2148 /*
2149 * Add prefix route.
2150 */
2151
2152 static void
2153 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2154 unsigned long expires, u32 flags)
2155 {
2156 struct fib6_config cfg = {
2157 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2158 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2159 .fc_ifindex = dev->ifindex,
2160 .fc_expires = expires,
2161 .fc_dst_len = plen,
2162 .fc_flags = RTF_UP | flags,
2163 .fc_nlinfo.nl_net = dev_net(dev),
2164 .fc_protocol = RTPROT_KERNEL,
2165 };
2166
2167 cfg.fc_dst = *pfx;
2168
2169 /* Prevent useless cloning on PtP SIT.
2170 This thing is done here expecting that the whole
2171 class of non-broadcast devices need not cloning.
2172 */
2173 #if IS_ENABLED(CONFIG_IPV6_SIT)
2174 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2175 cfg.fc_flags |= RTF_NONEXTHOP;
2176 #endif
2177
2178 ip6_route_add(&cfg);
2179 }
2180
2181
2182 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2183 int plen,
2184 const struct net_device *dev,
2185 u32 flags, u32 noflags)
2186 {
2187 struct fib6_node *fn;
2188 struct rt6_info *rt = NULL;
2189 struct fib6_table *table;
2190 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2191
2192 table = fib6_get_table(dev_net(dev), tb_id);
2193 if (!table)
2194 return NULL;
2195
2196 read_lock_bh(&table->tb6_lock);
2197 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2198 if (!fn)
2199 goto out;
2200
2201 noflags |= RTF_CACHE;
2202 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2203 if (rt->dst.dev->ifindex != dev->ifindex)
2204 continue;
2205 if ((rt->rt6i_flags & flags) != flags)
2206 continue;
2207 if ((rt->rt6i_flags & noflags) != 0)
2208 continue;
2209 dst_hold(&rt->dst);
2210 break;
2211 }
2212 out:
2213 read_unlock_bh(&table->tb6_lock);
2214 return rt;
2215 }
2216
2217
2218 /* Create "default" multicast route to the interface */
2219
2220 static void addrconf_add_mroute(struct net_device *dev)
2221 {
2222 struct fib6_config cfg = {
2223 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2224 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2225 .fc_ifindex = dev->ifindex,
2226 .fc_dst_len = 8,
2227 .fc_flags = RTF_UP,
2228 .fc_nlinfo.nl_net = dev_net(dev),
2229 };
2230
2231 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2232
2233 ip6_route_add(&cfg);
2234 }
2235
2236 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2237 {
2238 struct inet6_dev *idev;
2239
2240 ASSERT_RTNL();
2241
2242 idev = ipv6_find_idev(dev);
2243 if (!idev)
2244 return ERR_PTR(-ENOBUFS);
2245
2246 if (idev->cnf.disable_ipv6)
2247 return ERR_PTR(-EACCES);
2248
2249 /* Add default multicast route */
2250 if (!(dev->flags & IFF_LOOPBACK))
2251 addrconf_add_mroute(dev);
2252
2253 return idev;
2254 }
2255
2256 static void manage_tempaddrs(struct inet6_dev *idev,
2257 struct inet6_ifaddr *ifp,
2258 __u32 valid_lft, __u32 prefered_lft,
2259 bool create, unsigned long now)
2260 {
2261 u32 flags;
2262 struct inet6_ifaddr *ift;
2263
2264 read_lock_bh(&idev->lock);
2265 /* update all temporary addresses in the list */
2266 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2267 int age, max_valid, max_prefered;
2268
2269 if (ifp != ift->ifpub)
2270 continue;
2271
2272 /* RFC 4941 section 3.3:
2273 * If a received option will extend the lifetime of a public
2274 * address, the lifetimes of temporary addresses should
2275 * be extended, subject to the overall constraint that no
2276 * temporary addresses should ever remain "valid" or "preferred"
2277 * for a time longer than (TEMP_VALID_LIFETIME) or
2278 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2279 */
2280 age = (now - ift->cstamp) / HZ;
2281 max_valid = idev->cnf.temp_valid_lft - age;
2282 if (max_valid < 0)
2283 max_valid = 0;
2284
2285 max_prefered = idev->cnf.temp_prefered_lft -
2286 idev->cnf.max_desync_factor - age;
2287 if (max_prefered < 0)
2288 max_prefered = 0;
2289
2290 if (valid_lft > max_valid)
2291 valid_lft = max_valid;
2292
2293 if (prefered_lft > max_prefered)
2294 prefered_lft = max_prefered;
2295
2296 spin_lock(&ift->lock);
2297 flags = ift->flags;
2298 ift->valid_lft = valid_lft;
2299 ift->prefered_lft = prefered_lft;
2300 ift->tstamp = now;
2301 if (prefered_lft > 0)
2302 ift->flags &= ~IFA_F_DEPRECATED;
2303
2304 spin_unlock(&ift->lock);
2305 if (!(flags&IFA_F_TENTATIVE))
2306 ipv6_ifa_notify(0, ift);
2307 }
2308
2309 if ((create || list_empty(&idev->tempaddr_list)) &&
2310 idev->cnf.use_tempaddr > 0) {
2311 /* When a new public address is created as described
2312 * in [ADDRCONF], also create a new temporary address.
2313 * Also create a temporary address if it's enabled but
2314 * no temporary address currently exists.
2315 */
2316 read_unlock_bh(&idev->lock);
2317 ipv6_create_tempaddr(ifp, NULL);
2318 } else {
2319 read_unlock_bh(&idev->lock);
2320 }
2321 }
2322
2323 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2324 {
2325 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2326 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2327 }
2328
2329 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2330 {
2331 struct prefix_info *pinfo;
2332 __u32 valid_lft;
2333 __u32 prefered_lft;
2334 int addr_type;
2335 u32 addr_flags = 0;
2336 struct inet6_dev *in6_dev;
2337 struct net *net = dev_net(dev);
2338
2339 pinfo = (struct prefix_info *) opt;
2340
2341 if (len < sizeof(struct prefix_info)) {
2342 ADBG("addrconf: prefix option too short\n");
2343 return;
2344 }
2345
2346 /*
2347 * Validation checks ([ADDRCONF], page 19)
2348 */
2349
2350 addr_type = ipv6_addr_type(&pinfo->prefix);
2351
2352 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2353 return;
2354
2355 valid_lft = ntohl(pinfo->valid);
2356 prefered_lft = ntohl(pinfo->prefered);
2357
2358 if (prefered_lft > valid_lft) {
2359 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2360 return;
2361 }
2362
2363 in6_dev = in6_dev_get(dev);
2364
2365 if (!in6_dev) {
2366 net_dbg_ratelimited("addrconf: device %s not configured\n",
2367 dev->name);
2368 return;
2369 }
2370
2371 /*
2372 * Two things going on here:
2373 * 1) Add routes for on-link prefixes
2374 * 2) Configure prefixes with the auto flag set
2375 */
2376
2377 if (pinfo->onlink) {
2378 struct rt6_info *rt;
2379 unsigned long rt_expires;
2380
2381 /* Avoid arithmetic overflow. Really, we could
2382 * save rt_expires in seconds, likely valid_lft,
2383 * but it would require division in fib gc, that it
2384 * not good.
2385 */
2386 if (HZ > USER_HZ)
2387 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2388 else
2389 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2390
2391 if (addrconf_finite_timeout(rt_expires))
2392 rt_expires *= HZ;
2393
2394 rt = addrconf_get_prefix_route(&pinfo->prefix,
2395 pinfo->prefix_len,
2396 dev,
2397 RTF_ADDRCONF | RTF_PREFIX_RT,
2398 RTF_GATEWAY | RTF_DEFAULT);
2399
2400 if (rt) {
2401 /* Autoconf prefix route */
2402 if (valid_lft == 0) {
2403 ip6_del_rt(rt);
2404 rt = NULL;
2405 } else if (addrconf_finite_timeout(rt_expires)) {
2406 /* not infinity */
2407 rt6_set_expires(rt, jiffies + rt_expires);
2408 } else {
2409 rt6_clean_expires(rt);
2410 }
2411 } else if (valid_lft) {
2412 clock_t expires = 0;
2413 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2414 if (addrconf_finite_timeout(rt_expires)) {
2415 /* not infinity */
2416 flags |= RTF_EXPIRES;
2417 expires = jiffies_to_clock_t(rt_expires);
2418 }
2419 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2420 dev, expires, flags);
2421 }
2422 ip6_rt_put(rt);
2423 }
2424
2425 /* Try to figure out our local address for this prefix */
2426
2427 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2428 struct inet6_ifaddr *ifp;
2429 struct in6_addr addr;
2430 int create = 0, update_lft = 0;
2431 bool tokenized = false;
2432
2433 if (pinfo->prefix_len == 64) {
2434 memcpy(&addr, &pinfo->prefix, 8);
2435
2436 if (!ipv6_addr_any(&in6_dev->token)) {
2437 read_lock_bh(&in6_dev->lock);
2438 memcpy(addr.s6_addr + 8,
2439 in6_dev->token.s6_addr + 8, 8);
2440 read_unlock_bh(&in6_dev->lock);
2441 tokenized = true;
2442 } else if (is_addr_mode_generate_stable(in6_dev) &&
2443 !ipv6_generate_stable_address(&addr, 0,
2444 in6_dev)) {
2445 addr_flags |= IFA_F_STABLE_PRIVACY;
2446 goto ok;
2447 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2448 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2449 in6_dev_put(in6_dev);
2450 return;
2451 }
2452 goto ok;
2453 }
2454 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2455 pinfo->prefix_len);
2456 in6_dev_put(in6_dev);
2457 return;
2458
2459 ok:
2460
2461 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2462
2463 if (!ifp && valid_lft) {
2464 int max_addresses = in6_dev->cnf.max_addresses;
2465
2466 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2467 if (in6_dev->cnf.optimistic_dad &&
2468 !net->ipv6.devconf_all->forwarding && sllao)
2469 addr_flags |= IFA_F_OPTIMISTIC;
2470 #endif
2471
2472 /* Do not allow to create too much of autoconfigured
2473 * addresses; this would be too easy way to crash kernel.
2474 */
2475 if (!max_addresses ||
2476 ipv6_count_addresses(in6_dev) < max_addresses)
2477 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2478 pinfo->prefix_len,
2479 addr_type&IPV6_ADDR_SCOPE_MASK,
2480 addr_flags, valid_lft,
2481 prefered_lft);
2482
2483 if (IS_ERR_OR_NULL(ifp)) {
2484 in6_dev_put(in6_dev);
2485 return;
2486 }
2487
2488 update_lft = 0;
2489 create = 1;
2490 spin_lock_bh(&ifp->lock);
2491 ifp->flags |= IFA_F_MANAGETEMPADDR;
2492 ifp->cstamp = jiffies;
2493 ifp->tokenized = tokenized;
2494 spin_unlock_bh(&ifp->lock);
2495 addrconf_dad_start(ifp);
2496 }
2497
2498 if (ifp) {
2499 u32 flags;
2500 unsigned long now;
2501 u32 stored_lft;
2502
2503 /* update lifetime (RFC2462 5.5.3 e) */
2504 spin_lock_bh(&ifp->lock);
2505 now = jiffies;
2506 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2507 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2508 else
2509 stored_lft = 0;
2510 if (!update_lft && !create && stored_lft) {
2511 const u32 minimum_lft = min_t(u32,
2512 stored_lft, MIN_VALID_LIFETIME);
2513 valid_lft = max(valid_lft, minimum_lft);
2514
2515 /* RFC4862 Section 5.5.3e:
2516 * "Note that the preferred lifetime of the
2517 * corresponding address is always reset to
2518 * the Preferred Lifetime in the received
2519 * Prefix Information option, regardless of
2520 * whether the valid lifetime is also reset or
2521 * ignored."
2522 *
2523 * So we should always update prefered_lft here.
2524 */
2525 update_lft = 1;
2526 }
2527
2528 if (update_lft) {
2529 ifp->valid_lft = valid_lft;
2530 ifp->prefered_lft = prefered_lft;
2531 ifp->tstamp = now;
2532 flags = ifp->flags;
2533 ifp->flags &= ~IFA_F_DEPRECATED;
2534 spin_unlock_bh(&ifp->lock);
2535
2536 if (!(flags&IFA_F_TENTATIVE))
2537 ipv6_ifa_notify(0, ifp);
2538 } else
2539 spin_unlock_bh(&ifp->lock);
2540
2541 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2542 create, now);
2543
2544 in6_ifa_put(ifp);
2545 addrconf_verify();
2546 }
2547 }
2548 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2549 in6_dev_put(in6_dev);
2550 }
2551
2552 /*
2553 * Set destination address.
2554 * Special case for SIT interfaces where we create a new "virtual"
2555 * device.
2556 */
2557 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2558 {
2559 struct in6_ifreq ireq;
2560 struct net_device *dev;
2561 int err = -EINVAL;
2562
2563 rtnl_lock();
2564
2565 err = -EFAULT;
2566 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2567 goto err_exit;
2568
2569 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2570
2571 err = -ENODEV;
2572 if (!dev)
2573 goto err_exit;
2574
2575 #if IS_ENABLED(CONFIG_IPV6_SIT)
2576 if (dev->type == ARPHRD_SIT) {
2577 const struct net_device_ops *ops = dev->netdev_ops;
2578 struct ifreq ifr;
2579 struct ip_tunnel_parm p;
2580
2581 err = -EADDRNOTAVAIL;
2582 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2583 goto err_exit;
2584
2585 memset(&p, 0, sizeof(p));
2586 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2587 p.iph.saddr = 0;
2588 p.iph.version = 4;
2589 p.iph.ihl = 5;
2590 p.iph.protocol = IPPROTO_IPV6;
2591 p.iph.ttl = 64;
2592 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2593
2594 if (ops->ndo_do_ioctl) {
2595 mm_segment_t oldfs = get_fs();
2596
2597 set_fs(KERNEL_DS);
2598 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2599 set_fs(oldfs);
2600 } else
2601 err = -EOPNOTSUPP;
2602
2603 if (err == 0) {
2604 err = -ENOBUFS;
2605 dev = __dev_get_by_name(net, p.name);
2606 if (!dev)
2607 goto err_exit;
2608 err = dev_open(dev);
2609 }
2610 }
2611 #endif
2612
2613 err_exit:
2614 rtnl_unlock();
2615 return err;
2616 }
2617
2618 static int ipv6_mc_config(struct sock *sk, bool join,
2619 const struct in6_addr *addr, int ifindex)
2620 {
2621 int ret;
2622
2623 ASSERT_RTNL();
2624
2625 lock_sock(sk);
2626 if (join)
2627 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2628 else
2629 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2630 release_sock(sk);
2631
2632 return ret;
2633 }
2634
2635 /*
2636 * Manual configuration of address on an interface
2637 */
2638 static int inet6_addr_add(struct net *net, int ifindex,
2639 const struct in6_addr *pfx,
2640 const struct in6_addr *peer_pfx,
2641 unsigned int plen, __u32 ifa_flags,
2642 __u32 prefered_lft, __u32 valid_lft)
2643 {
2644 struct inet6_ifaddr *ifp;
2645 struct inet6_dev *idev;
2646 struct net_device *dev;
2647 unsigned long timeout;
2648 clock_t expires;
2649 int scope;
2650 u32 flags;
2651
2652 ASSERT_RTNL();
2653
2654 if (plen > 128)
2655 return -EINVAL;
2656
2657 /* check the lifetime */
2658 if (!valid_lft || prefered_lft > valid_lft)
2659 return -EINVAL;
2660
2661 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2662 return -EINVAL;
2663
2664 dev = __dev_get_by_index(net, ifindex);
2665 if (!dev)
2666 return -ENODEV;
2667
2668 idev = addrconf_add_dev(dev);
2669 if (IS_ERR(idev))
2670 return PTR_ERR(idev);
2671
2672 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2673 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2674 true, pfx, ifindex);
2675
2676 if (ret < 0)
2677 return ret;
2678 }
2679
2680 scope = ipv6_addr_scope(pfx);
2681
2682 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2683 if (addrconf_finite_timeout(timeout)) {
2684 expires = jiffies_to_clock_t(timeout * HZ);
2685 valid_lft = timeout;
2686 flags = RTF_EXPIRES;
2687 } else {
2688 expires = 0;
2689 flags = 0;
2690 ifa_flags |= IFA_F_PERMANENT;
2691 }
2692
2693 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2694 if (addrconf_finite_timeout(timeout)) {
2695 if (timeout == 0)
2696 ifa_flags |= IFA_F_DEPRECATED;
2697 prefered_lft = timeout;
2698 }
2699
2700 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2701 valid_lft, prefered_lft);
2702
2703 if (!IS_ERR(ifp)) {
2704 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2705 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2706 expires, flags);
2707 }
2708
2709 /*
2710 * Note that section 3.1 of RFC 4429 indicates
2711 * that the Optimistic flag should not be set for
2712 * manually configured addresses
2713 */
2714 addrconf_dad_start(ifp);
2715 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2716 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2717 true, jiffies);
2718 in6_ifa_put(ifp);
2719 addrconf_verify_rtnl();
2720 return 0;
2721 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2722 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2723 false, pfx, ifindex);
2724 }
2725
2726 return PTR_ERR(ifp);
2727 }
2728
2729 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2730 const struct in6_addr *pfx, unsigned int plen)
2731 {
2732 struct inet6_ifaddr *ifp;
2733 struct inet6_dev *idev;
2734 struct net_device *dev;
2735
2736 if (plen > 128)
2737 return -EINVAL;
2738
2739 dev = __dev_get_by_index(net, ifindex);
2740 if (!dev)
2741 return -ENODEV;
2742
2743 idev = __in6_dev_get(dev);
2744 if (!idev)
2745 return -ENXIO;
2746
2747 read_lock_bh(&idev->lock);
2748 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2749 if (ifp->prefix_len == plen &&
2750 ipv6_addr_equal(pfx, &ifp->addr)) {
2751 in6_ifa_hold(ifp);
2752 read_unlock_bh(&idev->lock);
2753
2754 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2755 (ifa_flags & IFA_F_MANAGETEMPADDR))
2756 manage_tempaddrs(idev, ifp, 0, 0, false,
2757 jiffies);
2758 ipv6_del_addr(ifp);
2759 addrconf_verify_rtnl();
2760 if (ipv6_addr_is_multicast(pfx)) {
2761 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2762 false, pfx, dev->ifindex);
2763 }
2764 return 0;
2765 }
2766 }
2767 read_unlock_bh(&idev->lock);
2768 return -EADDRNOTAVAIL;
2769 }
2770
2771
2772 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2773 {
2774 struct in6_ifreq ireq;
2775 int err;
2776
2777 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2778 return -EPERM;
2779
2780 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2781 return -EFAULT;
2782
2783 rtnl_lock();
2784 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2785 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2786 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2787 rtnl_unlock();
2788 return err;
2789 }
2790
2791 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2792 {
2793 struct in6_ifreq ireq;
2794 int err;
2795
2796 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2797 return -EPERM;
2798
2799 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2800 return -EFAULT;
2801
2802 rtnl_lock();
2803 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2804 ireq.ifr6_prefixlen);
2805 rtnl_unlock();
2806 return err;
2807 }
2808
2809 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2810 int plen, int scope)
2811 {
2812 struct inet6_ifaddr *ifp;
2813
2814 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2815 scope, IFA_F_PERMANENT,
2816 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2817 if (!IS_ERR(ifp)) {
2818 spin_lock_bh(&ifp->lock);
2819 ifp->flags &= ~IFA_F_TENTATIVE;
2820 spin_unlock_bh(&ifp->lock);
2821 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2822 in6_ifa_put(ifp);
2823 }
2824 }
2825
2826 #if IS_ENABLED(CONFIG_IPV6_SIT)
2827 static void sit_add_v4_addrs(struct inet6_dev *idev)
2828 {
2829 struct in6_addr addr;
2830 struct net_device *dev;
2831 struct net *net = dev_net(idev->dev);
2832 int scope, plen;
2833 u32 pflags = 0;
2834
2835 ASSERT_RTNL();
2836
2837 memset(&addr, 0, sizeof(struct in6_addr));
2838 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2839
2840 if (idev->dev->flags&IFF_POINTOPOINT) {
2841 addr.s6_addr32[0] = htonl(0xfe800000);
2842 scope = IFA_LINK;
2843 plen = 64;
2844 } else {
2845 scope = IPV6_ADDR_COMPATv4;
2846 plen = 96;
2847 pflags |= RTF_NONEXTHOP;
2848 }
2849
2850 if (addr.s6_addr32[3]) {
2851 add_addr(idev, &addr, plen, scope);
2852 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2853 return;
2854 }
2855
2856 for_each_netdev(net, dev) {
2857 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2858 if (in_dev && (dev->flags & IFF_UP)) {
2859 struct in_ifaddr *ifa;
2860
2861 int flag = scope;
2862
2863 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2864
2865 addr.s6_addr32[3] = ifa->ifa_local;
2866
2867 if (ifa->ifa_scope == RT_SCOPE_LINK)
2868 continue;
2869 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2870 if (idev->dev->flags&IFF_POINTOPOINT)
2871 continue;
2872 flag |= IFA_HOST;
2873 }
2874
2875 add_addr(idev, &addr, plen, flag);
2876 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2877 pflags);
2878 }
2879 }
2880 }
2881 }
2882 #endif
2883
2884 static void init_loopback(struct net_device *dev)
2885 {
2886 struct inet6_dev *idev;
2887 struct net_device *sp_dev;
2888 struct inet6_ifaddr *sp_ifa;
2889 struct rt6_info *sp_rt;
2890
2891 /* ::1 */
2892
2893 ASSERT_RTNL();
2894
2895 idev = ipv6_find_idev(dev);
2896 if (!idev) {
2897 pr_debug("%s: add_dev failed\n", __func__);
2898 return;
2899 }
2900
2901 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2902
2903 /* Add routes to other interface's IPv6 addresses */
2904 for_each_netdev(dev_net(dev), sp_dev) {
2905 if (!strcmp(sp_dev->name, dev->name))
2906 continue;
2907
2908 idev = __in6_dev_get(sp_dev);
2909 if (!idev)
2910 continue;
2911
2912 read_lock_bh(&idev->lock);
2913 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2914
2915 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2916 continue;
2917
2918 if (sp_ifa->rt) {
2919 /* This dst has been added to garbage list when
2920 * lo device down, release this obsolete dst and
2921 * reallocate a new router for ifa.
2922 */
2923 if (sp_ifa->rt->dst.obsolete > 0) {
2924 ip6_rt_put(sp_ifa->rt);
2925 sp_ifa->rt = NULL;
2926 } else {
2927 continue;
2928 }
2929 }
2930
2931 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2932
2933 /* Failure cases are ignored */
2934 if (!IS_ERR(sp_rt)) {
2935 sp_ifa->rt = sp_rt;
2936 ip6_ins_rt(sp_rt);
2937 }
2938 }
2939 read_unlock_bh(&idev->lock);
2940 }
2941 }
2942
2943 static void addrconf_add_linklocal(struct inet6_dev *idev,
2944 const struct in6_addr *addr, u32 flags)
2945 {
2946 struct inet6_ifaddr *ifp;
2947 u32 addr_flags = flags | IFA_F_PERMANENT;
2948
2949 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2950 if (idev->cnf.optimistic_dad &&
2951 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2952 addr_flags |= IFA_F_OPTIMISTIC;
2953 #endif
2954
2955 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2956 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2957 if (!IS_ERR(ifp)) {
2958 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2959 addrconf_dad_start(ifp);
2960 in6_ifa_put(ifp);
2961 }
2962 }
2963
2964 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2965 {
2966 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2967 return true;
2968
2969 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2970 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2971 return true;
2972
2973 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2974 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2975 return true;
2976
2977 return false;
2978 }
2979
2980 static int ipv6_generate_stable_address(struct in6_addr *address,
2981 u8 dad_count,
2982 const struct inet6_dev *idev)
2983 {
2984 static DEFINE_SPINLOCK(lock);
2985 static __u32 digest[SHA_DIGEST_WORDS];
2986 static __u32 workspace[SHA_WORKSPACE_WORDS];
2987
2988 static union {
2989 char __data[SHA_MESSAGE_BYTES];
2990 struct {
2991 struct in6_addr secret;
2992 __be32 prefix[2];
2993 unsigned char hwaddr[MAX_ADDR_LEN];
2994 u8 dad_count;
2995 } __packed;
2996 } data;
2997
2998 struct in6_addr secret;
2999 struct in6_addr temp;
3000 struct net *net = dev_net(idev->dev);
3001
3002 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3003
3004 if (idev->cnf.stable_secret.initialized)
3005 secret = idev->cnf.stable_secret.secret;
3006 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3007 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3008 else
3009 return -1;
3010
3011 retry:
3012 spin_lock_bh(&lock);
3013
3014 sha_init(digest);
3015 memset(&data, 0, sizeof(data));
3016 memset(workspace, 0, sizeof(workspace));
3017 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3018 data.prefix[0] = address->s6_addr32[0];
3019 data.prefix[1] = address->s6_addr32[1];
3020 data.secret = secret;
3021 data.dad_count = dad_count;
3022
3023 sha_transform(digest, data.__data, workspace);
3024
3025 temp = *address;
3026 temp.s6_addr32[2] = (__force __be32)digest[0];
3027 temp.s6_addr32[3] = (__force __be32)digest[1];
3028
3029 spin_unlock_bh(&lock);
3030
3031 if (ipv6_reserved_interfaceid(temp)) {
3032 dad_count++;
3033 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3034 return -1;
3035 goto retry;
3036 }
3037
3038 *address = temp;
3039 return 0;
3040 }
3041
3042 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3043 {
3044 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3045
3046 if (s->initialized)
3047 return;
3048 s = &idev->cnf.stable_secret;
3049 get_random_bytes(&s->secret, sizeof(s->secret));
3050 s->initialized = true;
3051 }
3052
3053 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3054 {
3055 struct in6_addr addr;
3056
3057 /* no link local addresses on L3 master devices */
3058 if (netif_is_l3_master(idev->dev))
3059 return;
3060
3061 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3062
3063 switch (idev->addr_gen_mode) {
3064 case IN6_ADDR_GEN_MODE_RANDOM:
3065 ipv6_gen_mode_random_init(idev);
3066 /* fallthrough */
3067 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3068 if (!ipv6_generate_stable_address(&addr, 0, idev))
3069 addrconf_add_linklocal(idev, &addr,
3070 IFA_F_STABLE_PRIVACY);
3071 else if (prefix_route)
3072 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3073 break;
3074 case IN6_ADDR_GEN_MODE_EUI64:
3075 /* addrconf_add_linklocal also adds a prefix_route and we
3076 * only need to care about prefix routes if ipv6_generate_eui64
3077 * couldn't generate one.
3078 */
3079 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3080 addrconf_add_linklocal(idev, &addr, 0);
3081 else if (prefix_route)
3082 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3083 break;
3084 case IN6_ADDR_GEN_MODE_NONE:
3085 default:
3086 /* will not add any link local address */
3087 break;
3088 }
3089 }
3090
3091 static void addrconf_dev_config(struct net_device *dev)
3092 {
3093 struct inet6_dev *idev;
3094
3095 ASSERT_RTNL();
3096
3097 if ((dev->type != ARPHRD_ETHER) &&
3098 (dev->type != ARPHRD_FDDI) &&
3099 (dev->type != ARPHRD_ARCNET) &&
3100 (dev->type != ARPHRD_INFINIBAND) &&
3101 (dev->type != ARPHRD_IEEE1394) &&
3102 (dev->type != ARPHRD_TUNNEL6) &&
3103 (dev->type != ARPHRD_6LOWPAN) &&
3104 (dev->type != ARPHRD_NONE)) {
3105 /* Alas, we support only Ethernet autoconfiguration. */
3106 return;
3107 }
3108
3109 idev = addrconf_add_dev(dev);
3110 if (IS_ERR(idev))
3111 return;
3112
3113 /* this device type has no EUI support */
3114 if (dev->type == ARPHRD_NONE &&
3115 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3116 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3117
3118 addrconf_addr_gen(idev, false);
3119 }
3120
3121 #if IS_ENABLED(CONFIG_IPV6_SIT)
3122 static void addrconf_sit_config(struct net_device *dev)
3123 {
3124 struct inet6_dev *idev;
3125
3126 ASSERT_RTNL();
3127
3128 /*
3129 * Configure the tunnel with one of our IPv4
3130 * addresses... we should configure all of
3131 * our v4 addrs in the tunnel
3132 */
3133
3134 idev = ipv6_find_idev(dev);
3135 if (!idev) {
3136 pr_debug("%s: add_dev failed\n", __func__);
3137 return;
3138 }
3139
3140 if (dev->priv_flags & IFF_ISATAP) {
3141 addrconf_addr_gen(idev, false);
3142 return;
3143 }
3144
3145 sit_add_v4_addrs(idev);
3146
3147 if (dev->flags&IFF_POINTOPOINT)
3148 addrconf_add_mroute(dev);
3149 }
3150 #endif
3151
3152 #if IS_ENABLED(CONFIG_NET_IPGRE)
3153 static void addrconf_gre_config(struct net_device *dev)
3154 {
3155 struct inet6_dev *idev;
3156
3157 ASSERT_RTNL();
3158
3159 idev = ipv6_find_idev(dev);
3160 if (!idev) {
3161 pr_debug("%s: add_dev failed\n", __func__);
3162 return;
3163 }
3164
3165 addrconf_addr_gen(idev, true);
3166 if (dev->flags & IFF_POINTOPOINT)
3167 addrconf_add_mroute(dev);
3168 }
3169 #endif
3170
3171 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3172 void *ptr)
3173 {
3174 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3175 struct inet6_dev *idev = __in6_dev_get(dev);
3176 int run_pending = 0;
3177 int err;
3178
3179 switch (event) {
3180 case NETDEV_REGISTER:
3181 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3182 idev = ipv6_add_dev(dev);
3183 if (IS_ERR(idev))
3184 return notifier_from_errno(PTR_ERR(idev));
3185 }
3186 break;
3187
3188 case NETDEV_CHANGEMTU:
3189 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3190 if (dev->mtu < IPV6_MIN_MTU) {
3191 addrconf_ifdown(dev, 1);
3192 break;
3193 }
3194
3195 if (idev) {
3196 rt6_mtu_change(dev, dev->mtu);
3197 idev->cnf.mtu6 = dev->mtu;
3198 break;
3199 }
3200
3201 /* allocate new idev */
3202 idev = ipv6_add_dev(dev);
3203 if (IS_ERR(idev))
3204 break;
3205
3206 /* device is still not ready */
3207 if (!(idev->if_flags & IF_READY))
3208 break;
3209
3210 run_pending = 1;
3211
3212 /* fall through */
3213
3214 case NETDEV_UP:
3215 case NETDEV_CHANGE:
3216 if (dev->flags & IFF_SLAVE)
3217 break;
3218
3219 if (idev && idev->cnf.disable_ipv6)
3220 break;
3221
3222 if (event == NETDEV_UP) {
3223 if (!addrconf_qdisc_ok(dev)) {
3224 /* device is not ready yet. */
3225 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3226 dev->name);
3227 break;
3228 }
3229
3230 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3231 idev = ipv6_add_dev(dev);
3232
3233 if (!IS_ERR_OR_NULL(idev)) {
3234 idev->if_flags |= IF_READY;
3235 run_pending = 1;
3236 }
3237 } else if (event == NETDEV_CHANGE) {
3238 if (!addrconf_qdisc_ok(dev)) {
3239 /* device is still not ready. */
3240 break;
3241 }
3242
3243 if (idev) {
3244 if (idev->if_flags & IF_READY)
3245 /* device is already configured. */
3246 break;
3247 idev->if_flags |= IF_READY;
3248 }
3249
3250 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3251 dev->name);
3252
3253 run_pending = 1;
3254 }
3255
3256 switch (dev->type) {
3257 #if IS_ENABLED(CONFIG_IPV6_SIT)
3258 case ARPHRD_SIT:
3259 addrconf_sit_config(dev);
3260 break;
3261 #endif
3262 #if IS_ENABLED(CONFIG_NET_IPGRE)
3263 case ARPHRD_IPGRE:
3264 addrconf_gre_config(dev);
3265 break;
3266 #endif
3267 case ARPHRD_LOOPBACK:
3268 init_loopback(dev);
3269 break;
3270
3271 default:
3272 addrconf_dev_config(dev);
3273 break;
3274 }
3275
3276 if (!IS_ERR_OR_NULL(idev)) {
3277 if (run_pending)
3278 addrconf_dad_run(idev);
3279
3280 /*
3281 * If the MTU changed during the interface down,
3282 * when the interface up, the changed MTU must be
3283 * reflected in the idev as well as routers.
3284 */
3285 if (idev->cnf.mtu6 != dev->mtu &&
3286 dev->mtu >= IPV6_MIN_MTU) {
3287 rt6_mtu_change(dev, dev->mtu);
3288 idev->cnf.mtu6 = dev->mtu;
3289 }
3290 idev->tstamp = jiffies;
3291 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3292
3293 /*
3294 * If the changed mtu during down is lower than
3295 * IPV6_MIN_MTU stop IPv6 on this interface.
3296 */
3297 if (dev->mtu < IPV6_MIN_MTU)
3298 addrconf_ifdown(dev, 1);
3299 }
3300 break;
3301
3302 case NETDEV_DOWN:
3303 case NETDEV_UNREGISTER:
3304 /*
3305 * Remove all addresses from this interface.
3306 */
3307 addrconf_ifdown(dev, event != NETDEV_DOWN);
3308 break;
3309
3310 case NETDEV_CHANGENAME:
3311 if (idev) {
3312 snmp6_unregister_dev(idev);
3313 addrconf_sysctl_unregister(idev);
3314 err = addrconf_sysctl_register(idev);
3315 if (err)
3316 return notifier_from_errno(err);
3317 err = snmp6_register_dev(idev);
3318 if (err) {
3319 addrconf_sysctl_unregister(idev);
3320 return notifier_from_errno(err);
3321 }
3322 }
3323 break;
3324
3325 case NETDEV_PRE_TYPE_CHANGE:
3326 case NETDEV_POST_TYPE_CHANGE:
3327 if (idev)
3328 addrconf_type_change(dev, event);
3329 break;
3330 }
3331
3332 return NOTIFY_OK;
3333 }
3334
3335 /*
3336 * addrconf module should be notified of a device going up
3337 */
3338 static struct notifier_block ipv6_dev_notf = {
3339 .notifier_call = addrconf_notify,
3340 };
3341
3342 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3343 {
3344 struct inet6_dev *idev;
3345 ASSERT_RTNL();
3346
3347 idev = __in6_dev_get(dev);
3348
3349 if (event == NETDEV_POST_TYPE_CHANGE)
3350 ipv6_mc_remap(idev);
3351 else if (event == NETDEV_PRE_TYPE_CHANGE)
3352 ipv6_mc_unmap(idev);
3353 }
3354
3355 static int addrconf_ifdown(struct net_device *dev, int how)
3356 {
3357 struct net *net = dev_net(dev);
3358 struct inet6_dev *idev;
3359 struct inet6_ifaddr *ifa;
3360 int state, i;
3361
3362 ASSERT_RTNL();
3363
3364 rt6_ifdown(net, dev);
3365 neigh_ifdown(&nd_tbl, dev);
3366
3367 idev = __in6_dev_get(dev);
3368 if (!idev)
3369 return -ENODEV;
3370
3371 /*
3372 * Step 1: remove reference to ipv6 device from parent device.
3373 * Do not dev_put!
3374 */
3375 if (how) {
3376 idev->dead = 1;
3377
3378 /* protected by rtnl_lock */
3379 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3380
3381 /* Step 1.5: remove snmp6 entry */
3382 snmp6_unregister_dev(idev);
3383
3384 }
3385
3386 /* Step 2: clear hash table */
3387 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3388 struct hlist_head *h = &inet6_addr_lst[i];
3389
3390 spin_lock_bh(&addrconf_hash_lock);
3391 restart:
3392 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3393 if (ifa->idev == idev) {
3394 hlist_del_init_rcu(&ifa->addr_lst);
3395 addrconf_del_dad_work(ifa);
3396 goto restart;
3397 }
3398 }
3399 spin_unlock_bh(&addrconf_hash_lock);
3400 }
3401
3402 write_lock_bh(&idev->lock);
3403
3404 addrconf_del_rs_timer(idev);
3405
3406 /* Step 2: clear flags for stateless addrconf */
3407 if (!how)
3408 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3409
3410 if (how && del_timer(&idev->regen_timer))
3411 in6_dev_put(idev);
3412
3413 /* Step 3: clear tempaddr list */
3414 while (!list_empty(&idev->tempaddr_list)) {
3415 ifa = list_first_entry(&idev->tempaddr_list,
3416 struct inet6_ifaddr, tmp_list);
3417 list_del(&ifa->tmp_list);
3418 write_unlock_bh(&idev->lock);
3419 spin_lock_bh(&ifa->lock);
3420
3421 if (ifa->ifpub) {
3422 in6_ifa_put(ifa->ifpub);
3423 ifa->ifpub = NULL;
3424 }
3425 spin_unlock_bh(&ifa->lock);
3426 in6_ifa_put(ifa);
3427 write_lock_bh(&idev->lock);
3428 }
3429
3430 while (!list_empty(&idev->addr_list)) {
3431 ifa = list_first_entry(&idev->addr_list,
3432 struct inet6_ifaddr, if_list);
3433 addrconf_del_dad_work(ifa);
3434
3435 list_del(&ifa->if_list);
3436
3437 write_unlock_bh(&idev->lock);
3438
3439 spin_lock_bh(&ifa->lock);
3440 state = ifa->state;
3441 ifa->state = INET6_IFADDR_STATE_DEAD;
3442 spin_unlock_bh(&ifa->lock);
3443
3444 if (state != INET6_IFADDR_STATE_DEAD) {
3445 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3446 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3447 }
3448 in6_ifa_put(ifa);
3449
3450 write_lock_bh(&idev->lock);
3451 }
3452
3453 write_unlock_bh(&idev->lock);
3454
3455 /* Step 5: Discard anycast and multicast list */
3456 if (how) {
3457 ipv6_ac_destroy_dev(idev);
3458 ipv6_mc_destroy_dev(idev);
3459 } else {
3460 ipv6_mc_down(idev);
3461 }
3462
3463 idev->tstamp = jiffies;
3464
3465 /* Last: Shot the device (if unregistered) */
3466 if (how) {
3467 addrconf_sysctl_unregister(idev);
3468 neigh_parms_release(&nd_tbl, idev->nd_parms);
3469 neigh_ifdown(&nd_tbl, dev);
3470 in6_dev_put(idev);
3471 }
3472 return 0;
3473 }
3474
3475 static void addrconf_rs_timer(unsigned long data)
3476 {
3477 struct inet6_dev *idev = (struct inet6_dev *)data;
3478 struct net_device *dev = idev->dev;
3479 struct in6_addr lladdr;
3480
3481 write_lock(&idev->lock);
3482 if (idev->dead || !(idev->if_flags & IF_READY))
3483 goto out;
3484
3485 if (!ipv6_accept_ra(idev))
3486 goto out;
3487
3488 /* Announcement received after solicitation was sent */
3489 if (idev->if_flags & IF_RA_RCVD)
3490 goto out;
3491
3492 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3493 write_unlock(&idev->lock);
3494 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3495 ndisc_send_rs(dev, &lladdr,
3496 &in6addr_linklocal_allrouters);
3497 else
3498 goto put;
3499
3500 write_lock(&idev->lock);
3501 /* The wait after the last probe can be shorter */
3502 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3503 idev->cnf.rtr_solicits) ?
3504 idev->cnf.rtr_solicit_delay :
3505 idev->cnf.rtr_solicit_interval);
3506 } else {
3507 /*
3508 * Note: we do not support deprecated "all on-link"
3509 * assumption any longer.
3510 */
3511 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3512 }
3513
3514 out:
3515 write_unlock(&idev->lock);
3516 put:
3517 in6_dev_put(idev);
3518 }
3519
3520 /*
3521 * Duplicate Address Detection
3522 */
3523 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3524 {
3525 unsigned long rand_num;
3526 struct inet6_dev *idev = ifp->idev;
3527
3528 if (ifp->flags & IFA_F_OPTIMISTIC)
3529 rand_num = 0;
3530 else
3531 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3532
3533 ifp->dad_probes = idev->cnf.dad_transmits;
3534 addrconf_mod_dad_work(ifp, rand_num);
3535 }
3536
3537 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3538 {
3539 struct inet6_dev *idev = ifp->idev;
3540 struct net_device *dev = idev->dev;
3541 bool notify = false;
3542
3543 addrconf_join_solict(dev, &ifp->addr);
3544
3545 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3546
3547 read_lock_bh(&idev->lock);
3548 spin_lock(&ifp->lock);
3549 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3550 goto out;
3551
3552 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3553 idev->cnf.accept_dad < 1 ||
3554 !(ifp->flags&IFA_F_TENTATIVE) ||
3555 ifp->flags & IFA_F_NODAD) {
3556 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3557 spin_unlock(&ifp->lock);
3558 read_unlock_bh(&idev->lock);
3559
3560 addrconf_dad_completed(ifp);
3561 return;
3562 }
3563
3564 if (!(idev->if_flags & IF_READY)) {
3565 spin_unlock(&ifp->lock);
3566 read_unlock_bh(&idev->lock);
3567 /*
3568 * If the device is not ready:
3569 * - keep it tentative if it is a permanent address.
3570 * - otherwise, kill it.
3571 */
3572 in6_ifa_hold(ifp);
3573 addrconf_dad_stop(ifp, 0);
3574 return;
3575 }
3576
3577 /*
3578 * Optimistic nodes can start receiving
3579 * Frames right away
3580 */
3581 if (ifp->flags & IFA_F_OPTIMISTIC) {
3582 ip6_ins_rt(ifp->rt);
3583 if (ipv6_use_optimistic_addr(idev)) {
3584 /* Because optimistic nodes can use this address,
3585 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3586 */
3587 notify = true;
3588 }
3589 }
3590
3591 addrconf_dad_kick(ifp);
3592 out:
3593 spin_unlock(&ifp->lock);
3594 read_unlock_bh(&idev->lock);
3595 if (notify)
3596 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3597 }
3598
3599 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3600 {
3601 bool begin_dad = false;
3602
3603 spin_lock_bh(&ifp->lock);
3604 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3605 ifp->state = INET6_IFADDR_STATE_PREDAD;
3606 begin_dad = true;
3607 }
3608 spin_unlock_bh(&ifp->lock);
3609
3610 if (begin_dad)
3611 addrconf_mod_dad_work(ifp, 0);
3612 }
3613
3614 static void addrconf_dad_work(struct work_struct *w)
3615 {
3616 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3617 struct inet6_ifaddr,
3618 dad_work);
3619 struct inet6_dev *idev = ifp->idev;
3620 struct in6_addr mcaddr;
3621
3622 enum {
3623 DAD_PROCESS,
3624 DAD_BEGIN,
3625 DAD_ABORT,
3626 } action = DAD_PROCESS;
3627
3628 rtnl_lock();
3629
3630 spin_lock_bh(&ifp->lock);
3631 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3632 action = DAD_BEGIN;
3633 ifp->state = INET6_IFADDR_STATE_DAD;
3634 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3635 action = DAD_ABORT;
3636 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3637 }
3638 spin_unlock_bh(&ifp->lock);
3639
3640 if (action == DAD_BEGIN) {
3641 addrconf_dad_begin(ifp);
3642 goto out;
3643 } else if (action == DAD_ABORT) {
3644 addrconf_dad_stop(ifp, 1);
3645 goto out;
3646 }
3647
3648 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3649 goto out;
3650
3651 write_lock_bh(&idev->lock);
3652 if (idev->dead || !(idev->if_flags & IF_READY)) {
3653 write_unlock_bh(&idev->lock);
3654 goto out;
3655 }
3656
3657 spin_lock(&ifp->lock);
3658 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3659 spin_unlock(&ifp->lock);
3660 write_unlock_bh(&idev->lock);
3661 goto out;
3662 }
3663
3664 if (ifp->dad_probes == 0) {
3665 /*
3666 * DAD was successful
3667 */
3668
3669 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3670 spin_unlock(&ifp->lock);
3671 write_unlock_bh(&idev->lock);
3672
3673 addrconf_dad_completed(ifp);
3674
3675 goto out;
3676 }
3677
3678 ifp->dad_probes--;
3679 addrconf_mod_dad_work(ifp,
3680 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3681 spin_unlock(&ifp->lock);
3682 write_unlock_bh(&idev->lock);
3683
3684 /* send a neighbour solicitation for our addr */
3685 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3686 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3687 out:
3688 in6_ifa_put(ifp);
3689 rtnl_unlock();
3690 }
3691
3692 /* ifp->idev must be at least read locked */
3693 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3694 {
3695 struct inet6_ifaddr *ifpiter;
3696 struct inet6_dev *idev = ifp->idev;
3697
3698 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3699 if (ifpiter->scope > IFA_LINK)
3700 break;
3701 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3702 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3703 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3704 IFA_F_PERMANENT)
3705 return false;
3706 }
3707 return true;
3708 }
3709
3710 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3711 {
3712 struct net_device *dev = ifp->idev->dev;
3713 struct in6_addr lladdr;
3714 bool send_rs, send_mld;
3715
3716 addrconf_del_dad_work(ifp);
3717
3718 /*
3719 * Configure the address for reception. Now it is valid.
3720 */
3721
3722 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3723
3724 /* If added prefix is link local and we are prepared to process
3725 router advertisements, start sending router solicitations.
3726 */
3727
3728 read_lock_bh(&ifp->idev->lock);
3729 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3730 send_rs = send_mld &&
3731 ipv6_accept_ra(ifp->idev) &&
3732 ifp->idev->cnf.rtr_solicits > 0 &&
3733 (dev->flags&IFF_LOOPBACK) == 0;
3734 read_unlock_bh(&ifp->idev->lock);
3735
3736 /* While dad is in progress mld report's source address is in6_addrany.
3737 * Resend with proper ll now.
3738 */
3739 if (send_mld)
3740 ipv6_mc_dad_complete(ifp->idev);
3741
3742 if (send_rs) {
3743 /*
3744 * If a host as already performed a random delay
3745 * [...] as part of DAD [...] there is no need
3746 * to delay again before sending the first RS
3747 */
3748 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3749 return;
3750 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3751
3752 write_lock_bh(&ifp->idev->lock);
3753 spin_lock(&ifp->lock);
3754 ifp->idev->rs_probes = 1;
3755 ifp->idev->if_flags |= IF_RS_SENT;
3756 addrconf_mod_rs_timer(ifp->idev,
3757 ifp->idev->cnf.rtr_solicit_interval);
3758 spin_unlock(&ifp->lock);
3759 write_unlock_bh(&ifp->idev->lock);
3760 }
3761 }
3762
3763 static void addrconf_dad_run(struct inet6_dev *idev)
3764 {
3765 struct inet6_ifaddr *ifp;
3766
3767 read_lock_bh(&idev->lock);
3768 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3769 spin_lock(&ifp->lock);
3770 if (ifp->flags & IFA_F_TENTATIVE &&
3771 ifp->state == INET6_IFADDR_STATE_DAD)
3772 addrconf_dad_kick(ifp);
3773 spin_unlock(&ifp->lock);
3774 }
3775 read_unlock_bh(&idev->lock);
3776 }
3777
3778 #ifdef CONFIG_PROC_FS
3779 struct if6_iter_state {
3780 struct seq_net_private p;
3781 int bucket;
3782 int offset;
3783 };
3784
3785 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3786 {
3787 struct inet6_ifaddr *ifa = NULL;
3788 struct if6_iter_state *state = seq->private;
3789 struct net *net = seq_file_net(seq);
3790 int p = 0;
3791
3792 /* initial bucket if pos is 0 */
3793 if (pos == 0) {
3794 state->bucket = 0;
3795 state->offset = 0;
3796 }
3797
3798 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3799 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3800 addr_lst) {
3801 if (!net_eq(dev_net(ifa->idev->dev), net))
3802 continue;
3803 /* sync with offset */
3804 if (p < state->offset) {
3805 p++;
3806 continue;
3807 }
3808 state->offset++;
3809 return ifa;
3810 }
3811
3812 /* prepare for next bucket */
3813 state->offset = 0;
3814 p = 0;
3815 }
3816 return NULL;
3817 }
3818
3819 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3820 struct inet6_ifaddr *ifa)
3821 {
3822 struct if6_iter_state *state = seq->private;
3823 struct net *net = seq_file_net(seq);
3824
3825 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3826 if (!net_eq(dev_net(ifa->idev->dev), net))
3827 continue;
3828 state->offset++;
3829 return ifa;
3830 }
3831
3832 while (++state->bucket < IN6_ADDR_HSIZE) {
3833 state->offset = 0;
3834 hlist_for_each_entry_rcu_bh(ifa,
3835 &inet6_addr_lst[state->bucket], addr_lst) {
3836 if (!net_eq(dev_net(ifa->idev->dev), net))
3837 continue;
3838 state->offset++;
3839 return ifa;
3840 }
3841 }
3842
3843 return NULL;
3844 }
3845
3846 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3847 __acquires(rcu_bh)
3848 {
3849 rcu_read_lock_bh();
3850 return if6_get_first(seq, *pos);
3851 }
3852
3853 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3854 {
3855 struct inet6_ifaddr *ifa;
3856
3857 ifa = if6_get_next(seq, v);
3858 ++*pos;
3859 return ifa;
3860 }
3861
3862 static void if6_seq_stop(struct seq_file *seq, void *v)
3863 __releases(rcu_bh)
3864 {
3865 rcu_read_unlock_bh();
3866 }
3867
3868 static int if6_seq_show(struct seq_file *seq, void *v)
3869 {
3870 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3871 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3872 &ifp->addr,
3873 ifp->idev->dev->ifindex,
3874 ifp->prefix_len,
3875 ifp->scope,
3876 (u8) ifp->flags,
3877 ifp->idev->dev->name);
3878 return 0;
3879 }
3880
3881 static const struct seq_operations if6_seq_ops = {
3882 .start = if6_seq_start,
3883 .next = if6_seq_next,
3884 .show = if6_seq_show,
3885 .stop = if6_seq_stop,
3886 };
3887
3888 static int if6_seq_open(struct inode *inode, struct file *file)
3889 {
3890 return seq_open_net(inode, file, &if6_seq_ops,
3891 sizeof(struct if6_iter_state));
3892 }
3893
3894 static const struct file_operations if6_fops = {
3895 .owner = THIS_MODULE,
3896 .open = if6_seq_open,
3897 .read = seq_read,
3898 .llseek = seq_lseek,
3899 .release = seq_release_net,
3900 };
3901
3902 static int __net_init if6_proc_net_init(struct net *net)
3903 {
3904 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3905 return -ENOMEM;
3906 return 0;
3907 }
3908
3909 static void __net_exit if6_proc_net_exit(struct net *net)
3910 {
3911 remove_proc_entry("if_inet6", net->proc_net);
3912 }
3913
3914 static struct pernet_operations if6_proc_net_ops = {
3915 .init = if6_proc_net_init,
3916 .exit = if6_proc_net_exit,
3917 };
3918
3919 int __init if6_proc_init(void)
3920 {
3921 return register_pernet_subsys(&if6_proc_net_ops);
3922 }
3923
3924 void if6_proc_exit(void)
3925 {
3926 unregister_pernet_subsys(&if6_proc_net_ops);
3927 }
3928 #endif /* CONFIG_PROC_FS */
3929
3930 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3931 /* Check if address is a home address configured on any interface. */
3932 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3933 {
3934 int ret = 0;
3935 struct inet6_ifaddr *ifp = NULL;
3936 unsigned int hash = inet6_addr_hash(addr);
3937
3938 rcu_read_lock_bh();
3939 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3940 if (!net_eq(dev_net(ifp->idev->dev), net))
3941 continue;
3942 if (ipv6_addr_equal(&ifp->addr, addr) &&
3943 (ifp->flags & IFA_F_HOMEADDRESS)) {
3944 ret = 1;
3945 break;
3946 }
3947 }
3948 rcu_read_unlock_bh();
3949 return ret;
3950 }
3951 #endif
3952
3953 /*
3954 * Periodic address status verification
3955 */
3956
3957 static void addrconf_verify_rtnl(void)
3958 {
3959 unsigned long now, next, next_sec, next_sched;
3960 struct inet6_ifaddr *ifp;
3961 int i;
3962
3963 ASSERT_RTNL();
3964
3965 rcu_read_lock_bh();
3966 now = jiffies;
3967 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3968
3969 cancel_delayed_work(&addr_chk_work);
3970
3971 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3972 restart:
3973 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3974 unsigned long age;
3975
3976 /* When setting preferred_lft to a value not zero or
3977 * infinity, while valid_lft is infinity
3978 * IFA_F_PERMANENT has a non-infinity life time.
3979 */
3980 if ((ifp->flags & IFA_F_PERMANENT) &&
3981 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3982 continue;
3983
3984 spin_lock(&ifp->lock);
3985 /* We try to batch several events at once. */
3986 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3987
3988 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3989 age >= ifp->valid_lft) {
3990 spin_unlock(&ifp->lock);
3991 in6_ifa_hold(ifp);
3992 ipv6_del_addr(ifp);
3993 goto restart;
3994 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3995 spin_unlock(&ifp->lock);
3996 continue;
3997 } else if (age >= ifp->prefered_lft) {
3998 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3999 int deprecate = 0;
4000
4001 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4002 deprecate = 1;
4003 ifp->flags |= IFA_F_DEPRECATED;
4004 }
4005
4006 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4007 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4008 next = ifp->tstamp + ifp->valid_lft * HZ;
4009
4010 spin_unlock(&ifp->lock);
4011
4012 if (deprecate) {
4013 in6_ifa_hold(ifp);
4014
4015 ipv6_ifa_notify(0, ifp);
4016 in6_ifa_put(ifp);
4017 goto restart;
4018 }
4019 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4020 !(ifp->flags&IFA_F_TENTATIVE)) {
4021 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4022 ifp->idev->cnf.dad_transmits *
4023 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4024
4025 if (age >= ifp->prefered_lft - regen_advance) {
4026 struct inet6_ifaddr *ifpub = ifp->ifpub;
4027 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4028 next = ifp->tstamp + ifp->prefered_lft * HZ;
4029 if (!ifp->regen_count && ifpub) {
4030 ifp->regen_count++;
4031 in6_ifa_hold(ifp);
4032 in6_ifa_hold(ifpub);
4033 spin_unlock(&ifp->lock);
4034
4035 spin_lock(&ifpub->lock);
4036 ifpub->regen_count = 0;
4037 spin_unlock(&ifpub->lock);
4038 ipv6_create_tempaddr(ifpub, ifp);
4039 in6_ifa_put(ifpub);
4040 in6_ifa_put(ifp);
4041 goto restart;
4042 }
4043 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4044 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4045 spin_unlock(&ifp->lock);
4046 } else {
4047 /* ifp->prefered_lft <= ifp->valid_lft */
4048 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4049 next = ifp->tstamp + ifp->prefered_lft * HZ;
4050 spin_unlock(&ifp->lock);
4051 }
4052 }
4053 }
4054
4055 next_sec = round_jiffies_up(next);
4056 next_sched = next;
4057
4058 /* If rounded timeout is accurate enough, accept it. */
4059 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4060 next_sched = next_sec;
4061
4062 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4063 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4064 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4065
4066 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4067 now, next, next_sec, next_sched);
4068 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4069 rcu_read_unlock_bh();
4070 }
4071
4072 static void addrconf_verify_work(struct work_struct *w)
4073 {
4074 rtnl_lock();
4075 addrconf_verify_rtnl();
4076 rtnl_unlock();
4077 }
4078
4079 static void addrconf_verify(void)
4080 {
4081 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4082 }
4083
4084 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4085 struct in6_addr **peer_pfx)
4086 {
4087 struct in6_addr *pfx = NULL;
4088
4089 *peer_pfx = NULL;
4090
4091 if (addr)
4092 pfx = nla_data(addr);
4093
4094 if (local) {
4095 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4096 *peer_pfx = pfx;
4097 pfx = nla_data(local);
4098 }
4099
4100 return pfx;
4101 }
4102
4103 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4104 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4105 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4106 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4107 [IFA_FLAGS] = { .len = sizeof(u32) },
4108 };
4109
4110 static int
4111 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4112 {
4113 struct net *net = sock_net(skb->sk);
4114 struct ifaddrmsg *ifm;
4115 struct nlattr *tb[IFA_MAX+1];
4116 struct in6_addr *pfx, *peer_pfx;
4117 u32 ifa_flags;
4118 int err;
4119
4120 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4121 if (err < 0)
4122 return err;
4123
4124 ifm = nlmsg_data(nlh);
4125 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4126 if (!pfx)
4127 return -EINVAL;
4128
4129 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4130
4131 /* We ignore other flags so far. */
4132 ifa_flags &= IFA_F_MANAGETEMPADDR;
4133
4134 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4135 ifm->ifa_prefixlen);
4136 }
4137
4138 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4139 u32 prefered_lft, u32 valid_lft)
4140 {
4141 u32 flags;
4142 clock_t expires;
4143 unsigned long timeout;
4144 bool was_managetempaddr;
4145 bool had_prefixroute;
4146
4147 ASSERT_RTNL();
4148
4149 if (!valid_lft || (prefered_lft > valid_lft))
4150 return -EINVAL;
4151
4152 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4153 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4154 return -EINVAL;
4155
4156 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4157 if (addrconf_finite_timeout(timeout)) {
4158 expires = jiffies_to_clock_t(timeout * HZ);
4159 valid_lft = timeout;
4160 flags = RTF_EXPIRES;
4161 } else {
4162 expires = 0;
4163 flags = 0;
4164 ifa_flags |= IFA_F_PERMANENT;
4165 }
4166
4167 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4168 if (addrconf_finite_timeout(timeout)) {
4169 if (timeout == 0)
4170 ifa_flags |= IFA_F_DEPRECATED;
4171 prefered_lft = timeout;
4172 }
4173
4174 spin_lock_bh(&ifp->lock);
4175 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4176 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4177 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4178 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4179 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4180 IFA_F_NOPREFIXROUTE);
4181 ifp->flags |= ifa_flags;
4182 ifp->tstamp = jiffies;
4183 ifp->valid_lft = valid_lft;
4184 ifp->prefered_lft = prefered_lft;
4185
4186 spin_unlock_bh(&ifp->lock);
4187 if (!(ifp->flags&IFA_F_TENTATIVE))
4188 ipv6_ifa_notify(0, ifp);
4189
4190 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4191 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4192 expires, flags);
4193 } else if (had_prefixroute) {
4194 enum cleanup_prefix_rt_t action;
4195 unsigned long rt_expires;
4196
4197 write_lock_bh(&ifp->idev->lock);
4198 action = check_cleanup_prefix_route(ifp, &rt_expires);
4199 write_unlock_bh(&ifp->idev->lock);
4200
4201 if (action != CLEANUP_PREFIX_RT_NOP) {
4202 cleanup_prefix_route(ifp, rt_expires,
4203 action == CLEANUP_PREFIX_RT_DEL);
4204 }
4205 }
4206
4207 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4208 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4209 valid_lft = prefered_lft = 0;
4210 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4211 !was_managetempaddr, jiffies);
4212 }
4213
4214 addrconf_verify_rtnl();
4215
4216 return 0;
4217 }
4218
4219 static int
4220 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4221 {
4222 struct net *net = sock_net(skb->sk);
4223 struct ifaddrmsg *ifm;
4224 struct nlattr *tb[IFA_MAX+1];
4225 struct in6_addr *pfx, *peer_pfx;
4226 struct inet6_ifaddr *ifa;
4227 struct net_device *dev;
4228 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4229 u32 ifa_flags;
4230 int err;
4231
4232 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4233 if (err < 0)
4234 return err;
4235
4236 ifm = nlmsg_data(nlh);
4237 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4238 if (!pfx)
4239 return -EINVAL;
4240
4241 if (tb[IFA_CACHEINFO]) {
4242 struct ifa_cacheinfo *ci;
4243
4244 ci = nla_data(tb[IFA_CACHEINFO]);
4245 valid_lft = ci->ifa_valid;
4246 preferred_lft = ci->ifa_prefered;
4247 } else {
4248 preferred_lft = INFINITY_LIFE_TIME;
4249 valid_lft = INFINITY_LIFE_TIME;
4250 }
4251
4252 dev = __dev_get_by_index(net, ifm->ifa_index);
4253 if (!dev)
4254 return -ENODEV;
4255
4256 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4257
4258 /* We ignore other flags so far. */
4259 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4260 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4261
4262 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4263 if (!ifa) {
4264 /*
4265 * It would be best to check for !NLM_F_CREATE here but
4266 * userspace already relies on not having to provide this.
4267 */
4268 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4269 ifm->ifa_prefixlen, ifa_flags,
4270 preferred_lft, valid_lft);
4271 }
4272
4273 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4274 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4275 err = -EEXIST;
4276 else
4277 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4278
4279 in6_ifa_put(ifa);
4280
4281 return err;
4282 }
4283
4284 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4285 u8 scope, int ifindex)
4286 {
4287 struct ifaddrmsg *ifm;
4288
4289 ifm = nlmsg_data(nlh);
4290 ifm->ifa_family = AF_INET6;
4291 ifm->ifa_prefixlen = prefixlen;
4292 ifm->ifa_flags = flags;
4293 ifm->ifa_scope = scope;
4294 ifm->ifa_index = ifindex;
4295 }
4296
4297 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4298 unsigned long tstamp, u32 preferred, u32 valid)
4299 {
4300 struct ifa_cacheinfo ci;
4301
4302 ci.cstamp = cstamp_delta(cstamp);
4303 ci.tstamp = cstamp_delta(tstamp);
4304 ci.ifa_prefered = preferred;
4305 ci.ifa_valid = valid;
4306
4307 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4308 }
4309
4310 static inline int rt_scope(int ifa_scope)
4311 {
4312 if (ifa_scope & IFA_HOST)
4313 return RT_SCOPE_HOST;
4314 else if (ifa_scope & IFA_LINK)
4315 return RT_SCOPE_LINK;
4316 else if (ifa_scope & IFA_SITE)
4317 return RT_SCOPE_SITE;
4318 else
4319 return RT_SCOPE_UNIVERSE;
4320 }
4321
4322 static inline int inet6_ifaddr_msgsize(void)
4323 {
4324 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4325 + nla_total_size(16) /* IFA_LOCAL */
4326 + nla_total_size(16) /* IFA_ADDRESS */
4327 + nla_total_size(sizeof(struct ifa_cacheinfo))
4328 + nla_total_size(4) /* IFA_FLAGS */;
4329 }
4330
4331 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4332 u32 portid, u32 seq, int event, unsigned int flags)
4333 {
4334 struct nlmsghdr *nlh;
4335 u32 preferred, valid;
4336
4337 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4338 if (!nlh)
4339 return -EMSGSIZE;
4340
4341 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4342 ifa->idev->dev->ifindex);
4343
4344 if (!((ifa->flags&IFA_F_PERMANENT) &&
4345 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4346 preferred = ifa->prefered_lft;
4347 valid = ifa->valid_lft;
4348 if (preferred != INFINITY_LIFE_TIME) {
4349 long tval = (jiffies - ifa->tstamp)/HZ;
4350 if (preferred > tval)
4351 preferred -= tval;
4352 else
4353 preferred = 0;
4354 if (valid != INFINITY_LIFE_TIME) {
4355 if (valid > tval)
4356 valid -= tval;
4357 else
4358 valid = 0;
4359 }
4360 }
4361 } else {
4362 preferred = INFINITY_LIFE_TIME;
4363 valid = INFINITY_LIFE_TIME;
4364 }
4365
4366 if (!ipv6_addr_any(&ifa->peer_addr)) {
4367 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4368 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4369 goto error;
4370 } else
4371 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4372 goto error;
4373
4374 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4375 goto error;
4376
4377 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4378 goto error;
4379
4380 nlmsg_end(skb, nlh);
4381 return 0;
4382
4383 error:
4384 nlmsg_cancel(skb, nlh);
4385 return -EMSGSIZE;
4386 }
4387
4388 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4389 u32 portid, u32 seq, int event, u16 flags)
4390 {
4391 struct nlmsghdr *nlh;
4392 u8 scope = RT_SCOPE_UNIVERSE;
4393 int ifindex = ifmca->idev->dev->ifindex;
4394
4395 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4396 scope = RT_SCOPE_SITE;
4397
4398 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4399 if (!nlh)
4400 return -EMSGSIZE;
4401
4402 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4403 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4404 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4405 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4406 nlmsg_cancel(skb, nlh);
4407 return -EMSGSIZE;
4408 }
4409
4410 nlmsg_end(skb, nlh);
4411 return 0;
4412 }
4413
4414 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4415 u32 portid, u32 seq, int event, unsigned int flags)
4416 {
4417 struct nlmsghdr *nlh;
4418 u8 scope = RT_SCOPE_UNIVERSE;
4419 int ifindex = ifaca->aca_idev->dev->ifindex;
4420
4421 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4422 scope = RT_SCOPE_SITE;
4423
4424 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4425 if (!nlh)
4426 return -EMSGSIZE;
4427
4428 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4429 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4430 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4431 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4432 nlmsg_cancel(skb, nlh);
4433 return -EMSGSIZE;
4434 }
4435
4436 nlmsg_end(skb, nlh);
4437 return 0;
4438 }
4439
4440 enum addr_type_t {
4441 UNICAST_ADDR,
4442 MULTICAST_ADDR,
4443 ANYCAST_ADDR,
4444 };
4445
4446 /* called with rcu_read_lock() */
4447 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4448 struct netlink_callback *cb, enum addr_type_t type,
4449 int s_ip_idx, int *p_ip_idx)
4450 {
4451 struct ifmcaddr6 *ifmca;
4452 struct ifacaddr6 *ifaca;
4453 int err = 1;
4454 int ip_idx = *p_ip_idx;
4455
4456 read_lock_bh(&idev->lock);
4457 switch (type) {
4458 case UNICAST_ADDR: {
4459 struct inet6_ifaddr *ifa;
4460
4461 /* unicast address incl. temp addr */
4462 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4463 if (++ip_idx < s_ip_idx)
4464 continue;
4465 err = inet6_fill_ifaddr(skb, ifa,
4466 NETLINK_CB(cb->skb).portid,
4467 cb->nlh->nlmsg_seq,
4468 RTM_NEWADDR,
4469 NLM_F_MULTI);
4470 if (err < 0)
4471 break;
4472 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4473 }
4474 break;
4475 }
4476 case MULTICAST_ADDR:
4477 /* multicast address */
4478 for (ifmca = idev->mc_list; ifmca;
4479 ifmca = ifmca->next, ip_idx++) {
4480 if (ip_idx < s_ip_idx)
4481 continue;
4482 err = inet6_fill_ifmcaddr(skb, ifmca,
4483 NETLINK_CB(cb->skb).portid,
4484 cb->nlh->nlmsg_seq,
4485 RTM_GETMULTICAST,
4486 NLM_F_MULTI);
4487 if (err < 0)
4488 break;
4489 }
4490 break;
4491 case ANYCAST_ADDR:
4492 /* anycast address */
4493 for (ifaca = idev->ac_list; ifaca;
4494 ifaca = ifaca->aca_next, ip_idx++) {
4495 if (ip_idx < s_ip_idx)
4496 continue;
4497 err = inet6_fill_ifacaddr(skb, ifaca,
4498 NETLINK_CB(cb->skb).portid,
4499 cb->nlh->nlmsg_seq,
4500 RTM_GETANYCAST,
4501 NLM_F_MULTI);
4502 if (err < 0)
4503 break;
4504 }
4505 break;
4506 default:
4507 break;
4508 }
4509 read_unlock_bh(&idev->lock);
4510 *p_ip_idx = ip_idx;
4511 return err;
4512 }
4513
4514 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4515 enum addr_type_t type)
4516 {
4517 struct net *net = sock_net(skb->sk);
4518 int h, s_h;
4519 int idx, ip_idx;
4520 int s_idx, s_ip_idx;
4521 struct net_device *dev;
4522 struct inet6_dev *idev;
4523 struct hlist_head *head;
4524
4525 s_h = cb->args[0];
4526 s_idx = idx = cb->args[1];
4527 s_ip_idx = ip_idx = cb->args[2];
4528
4529 rcu_read_lock();
4530 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4531 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4532 idx = 0;
4533 head = &net->dev_index_head[h];
4534 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4535 if (idx < s_idx)
4536 goto cont;
4537 if (h > s_h || idx > s_idx)
4538 s_ip_idx = 0;
4539 ip_idx = 0;
4540 idev = __in6_dev_get(dev);
4541 if (!idev)
4542 goto cont;
4543
4544 if (in6_dump_addrs(idev, skb, cb, type,
4545 s_ip_idx, &ip_idx) < 0)
4546 goto done;
4547 cont:
4548 idx++;
4549 }
4550 }
4551 done:
4552 rcu_read_unlock();
4553 cb->args[0] = h;
4554 cb->args[1] = idx;
4555 cb->args[2] = ip_idx;
4556
4557 return skb->len;
4558 }
4559
4560 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4561 {
4562 enum addr_type_t type = UNICAST_ADDR;
4563
4564 return inet6_dump_addr(skb, cb, type);
4565 }
4566
4567 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4568 {
4569 enum addr_type_t type = MULTICAST_ADDR;
4570
4571 return inet6_dump_addr(skb, cb, type);
4572 }
4573
4574
4575 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4576 {
4577 enum addr_type_t type = ANYCAST_ADDR;
4578
4579 return inet6_dump_addr(skb, cb, type);
4580 }
4581
4582 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4583 {
4584 struct net *net = sock_net(in_skb->sk);
4585 struct ifaddrmsg *ifm;
4586 struct nlattr *tb[IFA_MAX+1];
4587 struct in6_addr *addr = NULL, *peer;
4588 struct net_device *dev = NULL;
4589 struct inet6_ifaddr *ifa;
4590 struct sk_buff *skb;
4591 int err;
4592
4593 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4594 if (err < 0)
4595 goto errout;
4596
4597 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4598 if (!addr) {
4599 err = -EINVAL;
4600 goto errout;
4601 }
4602
4603 ifm = nlmsg_data(nlh);
4604 if (ifm->ifa_index)
4605 dev = __dev_get_by_index(net, ifm->ifa_index);
4606
4607 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4608 if (!ifa) {
4609 err = -EADDRNOTAVAIL;
4610 goto errout;
4611 }
4612
4613 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4614 if (!skb) {
4615 err = -ENOBUFS;
4616 goto errout_ifa;
4617 }
4618
4619 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4620 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4621 if (err < 0) {
4622 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4623 WARN_ON(err == -EMSGSIZE);
4624 kfree_skb(skb);
4625 goto errout_ifa;
4626 }
4627 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4628 errout_ifa:
4629 in6_ifa_put(ifa);
4630 errout:
4631 return err;
4632 }
4633
4634 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4635 {
4636 struct sk_buff *skb;
4637 struct net *net = dev_net(ifa->idev->dev);
4638 int err = -ENOBUFS;
4639
4640 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4641 if (!skb)
4642 goto errout;
4643
4644 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4645 if (err < 0) {
4646 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4647 WARN_ON(err == -EMSGSIZE);
4648 kfree_skb(skb);
4649 goto errout;
4650 }
4651 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4652 return;
4653 errout:
4654 if (err < 0)
4655 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4656 }
4657
4658 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4659 __s32 *array, int bytes)
4660 {
4661 BUG_ON(bytes < (DEVCONF_MAX * 4));
4662
4663 memset(array, 0, bytes);
4664 array[DEVCONF_FORWARDING] = cnf->forwarding;
4665 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4666 array[DEVCONF_MTU6] = cnf->mtu6;
4667 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4668 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4669 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4670 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4671 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4672 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4673 jiffies_to_msecs(cnf->rtr_solicit_interval);
4674 array[DEVCONF_RTR_SOLICIT_DELAY] =
4675 jiffies_to_msecs(cnf->rtr_solicit_delay);
4676 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4677 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4678 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4679 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4680 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4681 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4682 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4683 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4684 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4685 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4686 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4687 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4688 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4689 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4690 #ifdef CONFIG_IPV6_ROUTER_PREF
4691 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4692 array[DEVCONF_RTR_PROBE_INTERVAL] =
4693 jiffies_to_msecs(cnf->rtr_probe_interval);
4694 #ifdef CONFIG_IPV6_ROUTE_INFO
4695 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4696 #endif
4697 #endif
4698 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4699 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4700 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4701 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4702 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4703 #endif
4704 #ifdef CONFIG_IPV6_MROUTE
4705 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4706 #endif
4707 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4708 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4709 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4710 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4711 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4712 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4713 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4714 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4715 /* we omit DEVCONF_STABLE_SECRET for now */
4716 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4717 }
4718
4719 static inline size_t inet6_ifla6_size(void)
4720 {
4721 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4722 + nla_total_size(sizeof(struct ifla_cacheinfo))
4723 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4724 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4725 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4726 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4727 }
4728
4729 static inline size_t inet6_if_nlmsg_size(void)
4730 {
4731 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4732 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4733 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4734 + nla_total_size(4) /* IFLA_MTU */
4735 + nla_total_size(4) /* IFLA_LINK */
4736 + nla_total_size(1) /* IFLA_OPERSTATE */
4737 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4738 }
4739
4740 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4741 int items, int bytes)
4742 {
4743 int i;
4744 int pad = bytes - sizeof(u64) * items;
4745 BUG_ON(pad < 0);
4746
4747 /* Use put_unaligned() because stats may not be aligned for u64. */
4748 put_unaligned(items, &stats[0]);
4749 for (i = 1; i < items; i++)
4750 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4751
4752 memset(&stats[items], 0, pad);
4753 }
4754
4755 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4756 int bytes, size_t syncpoff)
4757 {
4758 int i, c;
4759 u64 buff[IPSTATS_MIB_MAX];
4760 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4761
4762 BUG_ON(pad < 0);
4763
4764 memset(buff, 0, sizeof(buff));
4765 buff[0] = IPSTATS_MIB_MAX;
4766
4767 for_each_possible_cpu(c) {
4768 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4769 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4770 }
4771
4772 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4773 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4774 }
4775
4776 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4777 int bytes)
4778 {
4779 switch (attrtype) {
4780 case IFLA_INET6_STATS:
4781 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4782 offsetof(struct ipstats_mib, syncp));
4783 break;
4784 case IFLA_INET6_ICMP6STATS:
4785 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4786 break;
4787 }
4788 }
4789
4790 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4791 u32 ext_filter_mask)
4792 {
4793 struct nlattr *nla;
4794 struct ifla_cacheinfo ci;
4795
4796 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4797 goto nla_put_failure;
4798 ci.max_reasm_len = IPV6_MAXPLEN;
4799 ci.tstamp = cstamp_delta(idev->tstamp);
4800 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4801 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4802 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4803 goto nla_put_failure;
4804 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4805 if (!nla)
4806 goto nla_put_failure;
4807 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4808
4809 /* XXX - MC not implemented */
4810
4811 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4812 return 0;
4813
4814 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4815 if (!nla)
4816 goto nla_put_failure;
4817 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4818
4819 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4820 if (!nla)
4821 goto nla_put_failure;
4822 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4823
4824 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4825 if (!nla)
4826 goto nla_put_failure;
4827
4828 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4829 goto nla_put_failure;
4830
4831 read_lock_bh(&idev->lock);
4832 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4833 read_unlock_bh(&idev->lock);
4834
4835 return 0;
4836
4837 nla_put_failure:
4838 return -EMSGSIZE;
4839 }
4840
4841 static size_t inet6_get_link_af_size(const struct net_device *dev,
4842 u32 ext_filter_mask)
4843 {
4844 if (!__in6_dev_get(dev))
4845 return 0;
4846
4847 return inet6_ifla6_size();
4848 }
4849
4850 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4851 u32 ext_filter_mask)
4852 {
4853 struct inet6_dev *idev = __in6_dev_get(dev);
4854
4855 if (!idev)
4856 return -ENODATA;
4857
4858 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4859 return -EMSGSIZE;
4860
4861 return 0;
4862 }
4863
4864 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4865 {
4866 struct inet6_ifaddr *ifp;
4867 struct net_device *dev = idev->dev;
4868 bool update_rs = false;
4869 struct in6_addr ll_addr;
4870
4871 ASSERT_RTNL();
4872
4873 if (!token)
4874 return -EINVAL;
4875 if (ipv6_addr_any(token))
4876 return -EINVAL;
4877 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4878 return -EINVAL;
4879 if (!ipv6_accept_ra(idev))
4880 return -EINVAL;
4881 if (idev->cnf.rtr_solicits <= 0)
4882 return -EINVAL;
4883
4884 write_lock_bh(&idev->lock);
4885
4886 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4887 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4888
4889 write_unlock_bh(&idev->lock);
4890
4891 if (!idev->dead && (idev->if_flags & IF_READY) &&
4892 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4893 IFA_F_OPTIMISTIC)) {
4894
4895 /* If we're not ready, then normal ifup will take care
4896 * of this. Otherwise, we need to request our rs here.
4897 */
4898 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4899 update_rs = true;
4900 }
4901
4902 write_lock_bh(&idev->lock);
4903
4904 if (update_rs) {
4905 idev->if_flags |= IF_RS_SENT;
4906 idev->rs_probes = 1;
4907 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4908 }
4909
4910 /* Well, that's kinda nasty ... */
4911 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4912 spin_lock(&ifp->lock);
4913 if (ifp->tokenized) {
4914 ifp->valid_lft = 0;
4915 ifp->prefered_lft = 0;
4916 }
4917 spin_unlock(&ifp->lock);
4918 }
4919
4920 write_unlock_bh(&idev->lock);
4921 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4922 addrconf_verify_rtnl();
4923 return 0;
4924 }
4925
4926 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4927 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4928 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4929 };
4930
4931 static int inet6_validate_link_af(const struct net_device *dev,
4932 const struct nlattr *nla)
4933 {
4934 struct nlattr *tb[IFLA_INET6_MAX + 1];
4935
4936 if (dev && !__in6_dev_get(dev))
4937 return -EAFNOSUPPORT;
4938
4939 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4940 }
4941
4942 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4943 {
4944 int err = -EINVAL;
4945 struct inet6_dev *idev = __in6_dev_get(dev);
4946 struct nlattr *tb[IFLA_INET6_MAX + 1];
4947
4948 if (!idev)
4949 return -EAFNOSUPPORT;
4950
4951 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4952 BUG();
4953
4954 if (tb[IFLA_INET6_TOKEN]) {
4955 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4956 if (err)
4957 return err;
4958 }
4959
4960 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4961 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4962
4963 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4964 mode != IN6_ADDR_GEN_MODE_NONE &&
4965 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4966 mode != IN6_ADDR_GEN_MODE_RANDOM)
4967 return -EINVAL;
4968
4969 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4970 !idev->cnf.stable_secret.initialized &&
4971 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4972 return -EINVAL;
4973
4974 idev->addr_gen_mode = mode;
4975 err = 0;
4976 }
4977
4978 return err;
4979 }
4980
4981 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4982 u32 portid, u32 seq, int event, unsigned int flags)
4983 {
4984 struct net_device *dev = idev->dev;
4985 struct ifinfomsg *hdr;
4986 struct nlmsghdr *nlh;
4987 void *protoinfo;
4988
4989 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4990 if (!nlh)
4991 return -EMSGSIZE;
4992
4993 hdr = nlmsg_data(nlh);
4994 hdr->ifi_family = AF_INET6;
4995 hdr->__ifi_pad = 0;
4996 hdr->ifi_type = dev->type;
4997 hdr->ifi_index = dev->ifindex;
4998 hdr->ifi_flags = dev_get_flags(dev);
4999 hdr->ifi_change = 0;
5000
5001 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5002 (dev->addr_len &&
5003 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5004 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5005 (dev->ifindex != dev_get_iflink(dev) &&
5006 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5007 nla_put_u8(skb, IFLA_OPERSTATE,
5008 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5009 goto nla_put_failure;
5010 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5011 if (!protoinfo)
5012 goto nla_put_failure;
5013
5014 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5015 goto nla_put_failure;
5016
5017 nla_nest_end(skb, protoinfo);
5018 nlmsg_end(skb, nlh);
5019 return 0;
5020
5021 nla_put_failure:
5022 nlmsg_cancel(skb, nlh);
5023 return -EMSGSIZE;
5024 }
5025
5026 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5027 {
5028 struct net *net = sock_net(skb->sk);
5029 int h, s_h;
5030 int idx = 0, s_idx;
5031 struct net_device *dev;
5032 struct inet6_dev *idev;
5033 struct hlist_head *head;
5034
5035 s_h = cb->args[0];
5036 s_idx = cb->args[1];
5037
5038 rcu_read_lock();
5039 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5040 idx = 0;
5041 head = &net->dev_index_head[h];
5042 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5043 if (idx < s_idx)
5044 goto cont;
5045 idev = __in6_dev_get(dev);
5046 if (!idev)
5047 goto cont;
5048 if (inet6_fill_ifinfo(skb, idev,
5049 NETLINK_CB(cb->skb).portid,
5050 cb->nlh->nlmsg_seq,
5051 RTM_NEWLINK, NLM_F_MULTI) < 0)
5052 goto out;
5053 cont:
5054 idx++;
5055 }
5056 }
5057 out:
5058 rcu_read_unlock();
5059 cb->args[1] = idx;
5060 cb->args[0] = h;
5061
5062 return skb->len;
5063 }
5064
5065 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5066 {
5067 struct sk_buff *skb;
5068 struct net *net = dev_net(idev->dev);
5069 int err = -ENOBUFS;
5070
5071 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5072 if (!skb)
5073 goto errout;
5074
5075 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5076 if (err < 0) {
5077 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5078 WARN_ON(err == -EMSGSIZE);
5079 kfree_skb(skb);
5080 goto errout;
5081 }
5082 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5083 return;
5084 errout:
5085 if (err < 0)
5086 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5087 }
5088
5089 static inline size_t inet6_prefix_nlmsg_size(void)
5090 {
5091 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5092 + nla_total_size(sizeof(struct in6_addr))
5093 + nla_total_size(sizeof(struct prefix_cacheinfo));
5094 }
5095
5096 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5097 struct prefix_info *pinfo, u32 portid, u32 seq,
5098 int event, unsigned int flags)
5099 {
5100 struct prefixmsg *pmsg;
5101 struct nlmsghdr *nlh;
5102 struct prefix_cacheinfo ci;
5103
5104 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5105 if (!nlh)
5106 return -EMSGSIZE;
5107
5108 pmsg = nlmsg_data(nlh);
5109 pmsg->prefix_family = AF_INET6;
5110 pmsg->prefix_pad1 = 0;
5111 pmsg->prefix_pad2 = 0;
5112 pmsg->prefix_ifindex = idev->dev->ifindex;
5113 pmsg->prefix_len = pinfo->prefix_len;
5114 pmsg->prefix_type = pinfo->type;
5115 pmsg->prefix_pad3 = 0;
5116 pmsg->prefix_flags = 0;
5117 if (pinfo->onlink)
5118 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5119 if (pinfo->autoconf)
5120 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5121
5122 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5123 goto nla_put_failure;
5124 ci.preferred_time = ntohl(pinfo->prefered);
5125 ci.valid_time = ntohl(pinfo->valid);
5126 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5127 goto nla_put_failure;
5128 nlmsg_end(skb, nlh);
5129 return 0;
5130
5131 nla_put_failure:
5132 nlmsg_cancel(skb, nlh);
5133 return -EMSGSIZE;
5134 }
5135
5136 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5137 struct prefix_info *pinfo)
5138 {
5139 struct sk_buff *skb;
5140 struct net *net = dev_net(idev->dev);
5141 int err = -ENOBUFS;
5142
5143 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5144 if (!skb)
5145 goto errout;
5146
5147 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5148 if (err < 0) {
5149 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5150 WARN_ON(err == -EMSGSIZE);
5151 kfree_skb(skb);
5152 goto errout;
5153 }
5154 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5155 return;
5156 errout:
5157 if (err < 0)
5158 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5159 }
5160
5161 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5162 {
5163 struct net *net = dev_net(ifp->idev->dev);
5164
5165 if (event)
5166 ASSERT_RTNL();
5167
5168 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5169
5170 switch (event) {
5171 case RTM_NEWADDR:
5172 /*
5173 * If the address was optimistic
5174 * we inserted the route at the start of
5175 * our DAD process, so we don't need
5176 * to do it again
5177 */
5178 if (!(ifp->rt->rt6i_node))
5179 ip6_ins_rt(ifp->rt);
5180 if (ifp->idev->cnf.forwarding)
5181 addrconf_join_anycast(ifp);
5182 if (!ipv6_addr_any(&ifp->peer_addr))
5183 addrconf_prefix_route(&ifp->peer_addr, 128,
5184 ifp->idev->dev, 0, 0);
5185 break;
5186 case RTM_DELADDR:
5187 if (ifp->idev->cnf.forwarding)
5188 addrconf_leave_anycast(ifp);
5189 addrconf_leave_solict(ifp->idev, &ifp->addr);
5190 if (!ipv6_addr_any(&ifp->peer_addr)) {
5191 struct rt6_info *rt;
5192
5193 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5194 ifp->idev->dev, 0, 0);
5195 if (rt)
5196 ip6_del_rt(rt);
5197 }
5198 dst_hold(&ifp->rt->dst);
5199
5200 ip6_del_rt(ifp->rt);
5201
5202 rt_genid_bump_ipv6(net);
5203 break;
5204 }
5205 atomic_inc(&net->ipv6.dev_addr_genid);
5206 }
5207
5208 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5209 {
5210 rcu_read_lock_bh();
5211 if (likely(ifp->idev->dead == 0))
5212 __ipv6_ifa_notify(event, ifp);
5213 rcu_read_unlock_bh();
5214 }
5215
5216 #ifdef CONFIG_SYSCTL
5217
5218 static
5219 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5220 void __user *buffer, size_t *lenp, loff_t *ppos)
5221 {
5222 int *valp = ctl->data;
5223 int val = *valp;
5224 loff_t pos = *ppos;
5225 struct ctl_table lctl;
5226 int ret;
5227
5228 /*
5229 * ctl->data points to idev->cnf.forwarding, we should
5230 * not modify it until we get the rtnl lock.
5231 */
5232 lctl = *ctl;
5233 lctl.data = &val;
5234
5235 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5236
5237 if (write)
5238 ret = addrconf_fixup_forwarding(ctl, valp, val);
5239 if (ret)
5240 *ppos = pos;
5241 return ret;
5242 }
5243
5244 static
5245 int addrconf_sysctl_hop_limit(struct ctl_table *ctl, int write,
5246 void __user *buffer, size_t *lenp, loff_t *ppos)
5247 {
5248 struct ctl_table lctl;
5249 int min_hl = 1, max_hl = 255;
5250
5251 lctl = *ctl;
5252 lctl.extra1 = &min_hl;
5253 lctl.extra2 = &max_hl;
5254
5255 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5256 }
5257
5258 static
5259 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5260 void __user *buffer, size_t *lenp, loff_t *ppos)
5261 {
5262 struct inet6_dev *idev = ctl->extra1;
5263 int min_mtu = IPV6_MIN_MTU;
5264 struct ctl_table lctl;
5265
5266 lctl = *ctl;
5267 lctl.extra1 = &min_mtu;
5268 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5269
5270 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5271 }
5272
5273 static void dev_disable_change(struct inet6_dev *idev)
5274 {
5275 struct netdev_notifier_info info;
5276
5277 if (!idev || !idev->dev)
5278 return;
5279
5280 netdev_notifier_info_init(&info, idev->dev);
5281 if (idev->cnf.disable_ipv6)
5282 addrconf_notify(NULL, NETDEV_DOWN, &info);
5283 else
5284 addrconf_notify(NULL, NETDEV_UP, &info);
5285 }
5286
5287 static void addrconf_disable_change(struct net *net, __s32 newf)
5288 {
5289 struct net_device *dev;
5290 struct inet6_dev *idev;
5291
5292 rcu_read_lock();
5293 for_each_netdev_rcu(net, dev) {
5294 idev = __in6_dev_get(dev);
5295 if (idev) {
5296 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5297 idev->cnf.disable_ipv6 = newf;
5298 if (changed)
5299 dev_disable_change(idev);
5300 }
5301 }
5302 rcu_read_unlock();
5303 }
5304
5305 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5306 {
5307 struct net *net;
5308 int old;
5309
5310 if (!rtnl_trylock())
5311 return restart_syscall();
5312
5313 net = (struct net *)table->extra2;
5314 old = *p;
5315 *p = newf;
5316
5317 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5318 rtnl_unlock();
5319 return 0;
5320 }
5321
5322 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5323 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5324 addrconf_disable_change(net, newf);
5325 } else if ((!newf) ^ (!old))
5326 dev_disable_change((struct inet6_dev *)table->extra1);
5327
5328 rtnl_unlock();
5329 return 0;
5330 }
5331
5332 static
5333 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5334 void __user *buffer, size_t *lenp, loff_t *ppos)
5335 {
5336 int *valp = ctl->data;
5337 int val = *valp;
5338 loff_t pos = *ppos;
5339 struct ctl_table lctl;
5340 int ret;
5341
5342 /*
5343 * ctl->data points to idev->cnf.disable_ipv6, we should
5344 * not modify it until we get the rtnl lock.
5345 */
5346 lctl = *ctl;
5347 lctl.data = &val;
5348
5349 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5350
5351 if (write)
5352 ret = addrconf_disable_ipv6(ctl, valp, val);
5353 if (ret)
5354 *ppos = pos;
5355 return ret;
5356 }
5357
5358 static
5359 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5360 void __user *buffer, size_t *lenp, loff_t *ppos)
5361 {
5362 int *valp = ctl->data;
5363 int ret;
5364 int old, new;
5365
5366 old = *valp;
5367 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5368 new = *valp;
5369
5370 if (write && old != new) {
5371 struct net *net = ctl->extra2;
5372
5373 if (!rtnl_trylock())
5374 return restart_syscall();
5375
5376 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5377 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5378 NETCONFA_IFINDEX_DEFAULT,
5379 net->ipv6.devconf_dflt);
5380 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5381 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5382 NETCONFA_IFINDEX_ALL,
5383 net->ipv6.devconf_all);
5384 else {
5385 struct inet6_dev *idev = ctl->extra1;
5386
5387 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5388 idev->dev->ifindex,
5389 &idev->cnf);
5390 }
5391 rtnl_unlock();
5392 }
5393
5394 return ret;
5395 }
5396
5397 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5398 void __user *buffer, size_t *lenp,
5399 loff_t *ppos)
5400 {
5401 int err;
5402 struct in6_addr addr;
5403 char str[IPV6_MAX_STRLEN];
5404 struct ctl_table lctl = *ctl;
5405 struct net *net = ctl->extra2;
5406 struct ipv6_stable_secret *secret = ctl->data;
5407
5408 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5409 return -EIO;
5410
5411 lctl.maxlen = IPV6_MAX_STRLEN;
5412 lctl.data = str;
5413
5414 if (!rtnl_trylock())
5415 return restart_syscall();
5416
5417 if (!write && !secret->initialized) {
5418 err = -EIO;
5419 goto out;
5420 }
5421
5422 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5423 if (err >= sizeof(str)) {
5424 err = -EIO;
5425 goto out;
5426 }
5427
5428 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5429 if (err || !write)
5430 goto out;
5431
5432 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5433 err = -EIO;
5434 goto out;
5435 }
5436
5437 secret->initialized = true;
5438 secret->secret = addr;
5439
5440 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5441 struct net_device *dev;
5442
5443 for_each_netdev(net, dev) {
5444 struct inet6_dev *idev = __in6_dev_get(dev);
5445
5446 if (idev) {
5447 idev->addr_gen_mode =
5448 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5449 }
5450 }
5451 } else {
5452 struct inet6_dev *idev = ctl->extra1;
5453
5454 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5455 }
5456
5457 out:
5458 rtnl_unlock();
5459
5460 return err;
5461 }
5462
5463 static
5464 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5465 int write,
5466 void __user *buffer,
5467 size_t *lenp,
5468 loff_t *ppos)
5469 {
5470 int *valp = ctl->data;
5471 int val = *valp;
5472 loff_t pos = *ppos;
5473 struct ctl_table lctl;
5474 int ret;
5475
5476 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5477 * we should not modify it until we get the rtnl lock.
5478 */
5479 lctl = *ctl;
5480 lctl.data = &val;
5481
5482 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5483
5484 if (write)
5485 ret = addrconf_fixup_linkdown(ctl, valp, val);
5486 if (ret)
5487 *ppos = pos;
5488 return ret;
5489 }
5490
5491 static struct addrconf_sysctl_table
5492 {
5493 struct ctl_table_header *sysctl_header;
5494 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5495 } addrconf_sysctl __read_mostly = {
5496 .sysctl_header = NULL,
5497 .addrconf_vars = {
5498 {
5499 .procname = "forwarding",
5500 .data = &ipv6_devconf.forwarding,
5501 .maxlen = sizeof(int),
5502 .mode = 0644,
5503 .proc_handler = addrconf_sysctl_forward,
5504 },
5505 {
5506 .procname = "hop_limit",
5507 .data = &ipv6_devconf.hop_limit,
5508 .maxlen = sizeof(int),
5509 .mode = 0644,
5510 .proc_handler = addrconf_sysctl_hop_limit,
5511 },
5512 {
5513 .procname = "mtu",
5514 .data = &ipv6_devconf.mtu6,
5515 .maxlen = sizeof(int),
5516 .mode = 0644,
5517 .proc_handler = addrconf_sysctl_mtu,
5518 },
5519 {
5520 .procname = "accept_ra",
5521 .data = &ipv6_devconf.accept_ra,
5522 .maxlen = sizeof(int),
5523 .mode = 0644,
5524 .proc_handler = proc_dointvec,
5525 },
5526 {
5527 .procname = "accept_redirects",
5528 .data = &ipv6_devconf.accept_redirects,
5529 .maxlen = sizeof(int),
5530 .mode = 0644,
5531 .proc_handler = proc_dointvec,
5532 },
5533 {
5534 .procname = "autoconf",
5535 .data = &ipv6_devconf.autoconf,
5536 .maxlen = sizeof(int),
5537 .mode = 0644,
5538 .proc_handler = proc_dointvec,
5539 },
5540 {
5541 .procname = "dad_transmits",
5542 .data = &ipv6_devconf.dad_transmits,
5543 .maxlen = sizeof(int),
5544 .mode = 0644,
5545 .proc_handler = proc_dointvec,
5546 },
5547 {
5548 .procname = "router_solicitations",
5549 .data = &ipv6_devconf.rtr_solicits,
5550 .maxlen = sizeof(int),
5551 .mode = 0644,
5552 .proc_handler = proc_dointvec,
5553 },
5554 {
5555 .procname = "router_solicitation_interval",
5556 .data = &ipv6_devconf.rtr_solicit_interval,
5557 .maxlen = sizeof(int),
5558 .mode = 0644,
5559 .proc_handler = proc_dointvec_jiffies,
5560 },
5561 {
5562 .procname = "router_solicitation_delay",
5563 .data = &ipv6_devconf.rtr_solicit_delay,
5564 .maxlen = sizeof(int),
5565 .mode = 0644,
5566 .proc_handler = proc_dointvec_jiffies,
5567 },
5568 {
5569 .procname = "force_mld_version",
5570 .data = &ipv6_devconf.force_mld_version,
5571 .maxlen = sizeof(int),
5572 .mode = 0644,
5573 .proc_handler = proc_dointvec,
5574 },
5575 {
5576 .procname = "mldv1_unsolicited_report_interval",
5577 .data =
5578 &ipv6_devconf.mldv1_unsolicited_report_interval,
5579 .maxlen = sizeof(int),
5580 .mode = 0644,
5581 .proc_handler = proc_dointvec_ms_jiffies,
5582 },
5583 {
5584 .procname = "mldv2_unsolicited_report_interval",
5585 .data =
5586 &ipv6_devconf.mldv2_unsolicited_report_interval,
5587 .maxlen = sizeof(int),
5588 .mode = 0644,
5589 .proc_handler = proc_dointvec_ms_jiffies,
5590 },
5591 {
5592 .procname = "use_tempaddr",
5593 .data = &ipv6_devconf.use_tempaddr,
5594 .maxlen = sizeof(int),
5595 .mode = 0644,
5596 .proc_handler = proc_dointvec,
5597 },
5598 {
5599 .procname = "temp_valid_lft",
5600 .data = &ipv6_devconf.temp_valid_lft,
5601 .maxlen = sizeof(int),
5602 .mode = 0644,
5603 .proc_handler = proc_dointvec,
5604 },
5605 {
5606 .procname = "temp_prefered_lft",
5607 .data = &ipv6_devconf.temp_prefered_lft,
5608 .maxlen = sizeof(int),
5609 .mode = 0644,
5610 .proc_handler = proc_dointvec,
5611 },
5612 {
5613 .procname = "regen_max_retry",
5614 .data = &ipv6_devconf.regen_max_retry,
5615 .maxlen = sizeof(int),
5616 .mode = 0644,
5617 .proc_handler = proc_dointvec,
5618 },
5619 {
5620 .procname = "max_desync_factor",
5621 .data = &ipv6_devconf.max_desync_factor,
5622 .maxlen = sizeof(int),
5623 .mode = 0644,
5624 .proc_handler = proc_dointvec,
5625 },
5626 {
5627 .procname = "max_addresses",
5628 .data = &ipv6_devconf.max_addresses,
5629 .maxlen = sizeof(int),
5630 .mode = 0644,
5631 .proc_handler = proc_dointvec,
5632 },
5633 {
5634 .procname = "accept_ra_defrtr",
5635 .data = &ipv6_devconf.accept_ra_defrtr,
5636 .maxlen = sizeof(int),
5637 .mode = 0644,
5638 .proc_handler = proc_dointvec,
5639 },
5640 {
5641 .procname = "accept_ra_min_hop_limit",
5642 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5643 .maxlen = sizeof(int),
5644 .mode = 0644,
5645 .proc_handler = proc_dointvec,
5646 },
5647 {
5648 .procname = "accept_ra_pinfo",
5649 .data = &ipv6_devconf.accept_ra_pinfo,
5650 .maxlen = sizeof(int),
5651 .mode = 0644,
5652 .proc_handler = proc_dointvec,
5653 },
5654 #ifdef CONFIG_IPV6_ROUTER_PREF
5655 {
5656 .procname = "accept_ra_rtr_pref",
5657 .data = &ipv6_devconf.accept_ra_rtr_pref,
5658 .maxlen = sizeof(int),
5659 .mode = 0644,
5660 .proc_handler = proc_dointvec,
5661 },
5662 {
5663 .procname = "router_probe_interval",
5664 .data = &ipv6_devconf.rtr_probe_interval,
5665 .maxlen = sizeof(int),
5666 .mode = 0644,
5667 .proc_handler = proc_dointvec_jiffies,
5668 },
5669 #ifdef CONFIG_IPV6_ROUTE_INFO
5670 {
5671 .procname = "accept_ra_rt_info_max_plen",
5672 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5673 .maxlen = sizeof(int),
5674 .mode = 0644,
5675 .proc_handler = proc_dointvec,
5676 },
5677 #endif
5678 #endif
5679 {
5680 .procname = "proxy_ndp",
5681 .data = &ipv6_devconf.proxy_ndp,
5682 .maxlen = sizeof(int),
5683 .mode = 0644,
5684 .proc_handler = addrconf_sysctl_proxy_ndp,
5685 },
5686 {
5687 .procname = "accept_source_route",
5688 .data = &ipv6_devconf.accept_source_route,
5689 .maxlen = sizeof(int),
5690 .mode = 0644,
5691 .proc_handler = proc_dointvec,
5692 },
5693 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5694 {
5695 .procname = "optimistic_dad",
5696 .data = &ipv6_devconf.optimistic_dad,
5697 .maxlen = sizeof(int),
5698 .mode = 0644,
5699 .proc_handler = proc_dointvec,
5700
5701 },
5702 {
5703 .procname = "use_optimistic",
5704 .data = &ipv6_devconf.use_optimistic,
5705 .maxlen = sizeof(int),
5706 .mode = 0644,
5707 .proc_handler = proc_dointvec,
5708
5709 },
5710 #endif
5711 #ifdef CONFIG_IPV6_MROUTE
5712 {
5713 .procname = "mc_forwarding",
5714 .data = &ipv6_devconf.mc_forwarding,
5715 .maxlen = sizeof(int),
5716 .mode = 0444,
5717 .proc_handler = proc_dointvec,
5718 },
5719 #endif
5720 {
5721 .procname = "disable_ipv6",
5722 .data = &ipv6_devconf.disable_ipv6,
5723 .maxlen = sizeof(int),
5724 .mode = 0644,
5725 .proc_handler = addrconf_sysctl_disable,
5726 },
5727 {
5728 .procname = "accept_dad",
5729 .data = &ipv6_devconf.accept_dad,
5730 .maxlen = sizeof(int),
5731 .mode = 0644,
5732 .proc_handler = proc_dointvec,
5733 },
5734 {
5735 .procname = "force_tllao",
5736 .data = &ipv6_devconf.force_tllao,
5737 .maxlen = sizeof(int),
5738 .mode = 0644,
5739 .proc_handler = proc_dointvec
5740 },
5741 {
5742 .procname = "ndisc_notify",
5743 .data = &ipv6_devconf.ndisc_notify,
5744 .maxlen = sizeof(int),
5745 .mode = 0644,
5746 .proc_handler = proc_dointvec
5747 },
5748 {
5749 .procname = "suppress_frag_ndisc",
5750 .data = &ipv6_devconf.suppress_frag_ndisc,
5751 .maxlen = sizeof(int),
5752 .mode = 0644,
5753 .proc_handler = proc_dointvec
5754 },
5755 {
5756 .procname = "accept_ra_from_local",
5757 .data = &ipv6_devconf.accept_ra_from_local,
5758 .maxlen = sizeof(int),
5759 .mode = 0644,
5760 .proc_handler = proc_dointvec,
5761 },
5762 {
5763 .procname = "accept_ra_mtu",
5764 .data = &ipv6_devconf.accept_ra_mtu,
5765 .maxlen = sizeof(int),
5766 .mode = 0644,
5767 .proc_handler = proc_dointvec,
5768 },
5769 {
5770 .procname = "stable_secret",
5771 .data = &ipv6_devconf.stable_secret,
5772 .maxlen = IPV6_MAX_STRLEN,
5773 .mode = 0600,
5774 .proc_handler = addrconf_sysctl_stable_secret,
5775 },
5776 {
5777 .procname = "use_oif_addrs_only",
5778 .data = &ipv6_devconf.use_oif_addrs_only,
5779 .maxlen = sizeof(int),
5780 .mode = 0644,
5781 .proc_handler = proc_dointvec,
5782 },
5783 {
5784 .procname = "ignore_routes_with_linkdown",
5785 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5786 .maxlen = sizeof(int),
5787 .mode = 0644,
5788 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5789 },
5790 {
5791 /* sentinel */
5792 }
5793 },
5794 };
5795
5796 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5797 struct inet6_dev *idev, struct ipv6_devconf *p)
5798 {
5799 int i;
5800 struct addrconf_sysctl_table *t;
5801 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5802
5803 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5804 if (!t)
5805 goto out;
5806
5807 for (i = 0; t->addrconf_vars[i].data; i++) {
5808 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5809 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5810 t->addrconf_vars[i].extra2 = net;
5811 }
5812
5813 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5814
5815 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5816 if (!t->sysctl_header)
5817 goto free;
5818
5819 p->sysctl = t;
5820 return 0;
5821
5822 free:
5823 kfree(t);
5824 out:
5825 return -ENOBUFS;
5826 }
5827
5828 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5829 {
5830 struct addrconf_sysctl_table *t;
5831
5832 if (!p->sysctl)
5833 return;
5834
5835 t = p->sysctl;
5836 p->sysctl = NULL;
5837 unregister_net_sysctl_table(t->sysctl_header);
5838 kfree(t);
5839 }
5840
5841 static int addrconf_sysctl_register(struct inet6_dev *idev)
5842 {
5843 int err;
5844
5845 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5846 return -EINVAL;
5847
5848 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5849 &ndisc_ifinfo_sysctl_change);
5850 if (err)
5851 return err;
5852 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5853 idev, &idev->cnf);
5854 if (err)
5855 neigh_sysctl_unregister(idev->nd_parms);
5856
5857 return err;
5858 }
5859
5860 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5861 {
5862 __addrconf_sysctl_unregister(&idev->cnf);
5863 neigh_sysctl_unregister(idev->nd_parms);
5864 }
5865
5866
5867 #endif
5868
5869 static int __net_init addrconf_init_net(struct net *net)
5870 {
5871 int err = -ENOMEM;
5872 struct ipv6_devconf *all, *dflt;
5873
5874 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5875 if (!all)
5876 goto err_alloc_all;
5877
5878 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5879 if (!dflt)
5880 goto err_alloc_dflt;
5881
5882 /* these will be inherited by all namespaces */
5883 dflt->autoconf = ipv6_defaults.autoconf;
5884 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5885
5886 dflt->stable_secret.initialized = false;
5887 all->stable_secret.initialized = false;
5888
5889 net->ipv6.devconf_all = all;
5890 net->ipv6.devconf_dflt = dflt;
5891
5892 #ifdef CONFIG_SYSCTL
5893 err = __addrconf_sysctl_register(net, "all", NULL, all);
5894 if (err < 0)
5895 goto err_reg_all;
5896
5897 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5898 if (err < 0)
5899 goto err_reg_dflt;
5900 #endif
5901 return 0;
5902
5903 #ifdef CONFIG_SYSCTL
5904 err_reg_dflt:
5905 __addrconf_sysctl_unregister(all);
5906 err_reg_all:
5907 kfree(dflt);
5908 #endif
5909 err_alloc_dflt:
5910 kfree(all);
5911 err_alloc_all:
5912 return err;
5913 }
5914
5915 static void __net_exit addrconf_exit_net(struct net *net)
5916 {
5917 #ifdef CONFIG_SYSCTL
5918 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5919 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5920 #endif
5921 kfree(net->ipv6.devconf_dflt);
5922 kfree(net->ipv6.devconf_all);
5923 }
5924
5925 static struct pernet_operations addrconf_ops = {
5926 .init = addrconf_init_net,
5927 .exit = addrconf_exit_net,
5928 };
5929
5930 static struct rtnl_af_ops inet6_ops __read_mostly = {
5931 .family = AF_INET6,
5932 .fill_link_af = inet6_fill_link_af,
5933 .get_link_af_size = inet6_get_link_af_size,
5934 .validate_link_af = inet6_validate_link_af,
5935 .set_link_af = inet6_set_link_af,
5936 };
5937
5938 /*
5939 * Init / cleanup code
5940 */
5941
5942 int __init addrconf_init(void)
5943 {
5944 struct inet6_dev *idev;
5945 int i, err;
5946
5947 err = ipv6_addr_label_init();
5948 if (err < 0) {
5949 pr_crit("%s: cannot initialize default policy table: %d\n",
5950 __func__, err);
5951 goto out;
5952 }
5953
5954 err = register_pernet_subsys(&addrconf_ops);
5955 if (err < 0)
5956 goto out_addrlabel;
5957
5958 addrconf_wq = create_workqueue("ipv6_addrconf");
5959 if (!addrconf_wq) {
5960 err = -ENOMEM;
5961 goto out_nowq;
5962 }
5963
5964 /* The addrconf netdev notifier requires that loopback_dev
5965 * has it's ipv6 private information allocated and setup
5966 * before it can bring up and give link-local addresses
5967 * to other devices which are up.
5968 *
5969 * Unfortunately, loopback_dev is not necessarily the first
5970 * entry in the global dev_base list of net devices. In fact,
5971 * it is likely to be the very last entry on that list.
5972 * So this causes the notifier registry below to try and
5973 * give link-local addresses to all devices besides loopback_dev
5974 * first, then loopback_dev, which cases all the non-loopback_dev
5975 * devices to fail to get a link-local address.
5976 *
5977 * So, as a temporary fix, allocate the ipv6 structure for
5978 * loopback_dev first by hand.
5979 * Longer term, all of the dependencies ipv6 has upon the loopback
5980 * device and it being up should be removed.
5981 */
5982 rtnl_lock();
5983 idev = ipv6_add_dev(init_net.loopback_dev);
5984 rtnl_unlock();
5985 if (IS_ERR(idev)) {
5986 err = PTR_ERR(idev);
5987 goto errlo;
5988 }
5989
5990 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5991 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5992
5993 register_netdevice_notifier(&ipv6_dev_notf);
5994
5995 addrconf_verify();
5996
5997 rtnl_af_register(&inet6_ops);
5998
5999 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6000 NULL);
6001 if (err < 0)
6002 goto errout;
6003
6004 /* Only the first call to __rtnl_register can fail */
6005 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6006 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6007 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6008 inet6_dump_ifaddr, NULL);
6009 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6010 inet6_dump_ifmcaddr, NULL);
6011 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6012 inet6_dump_ifacaddr, NULL);
6013 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6014 inet6_netconf_dump_devconf, NULL);
6015
6016 ipv6_addr_label_rtnl_register();
6017
6018 return 0;
6019 errout:
6020 rtnl_af_unregister(&inet6_ops);
6021 unregister_netdevice_notifier(&ipv6_dev_notf);
6022 errlo:
6023 destroy_workqueue(addrconf_wq);
6024 out_nowq:
6025 unregister_pernet_subsys(&addrconf_ops);
6026 out_addrlabel:
6027 ipv6_addr_label_cleanup();
6028 out:
6029 return err;
6030 }
6031
6032 void addrconf_cleanup(void)
6033 {
6034 struct net_device *dev;
6035 int i;
6036
6037 unregister_netdevice_notifier(&ipv6_dev_notf);
6038 unregister_pernet_subsys(&addrconf_ops);
6039 ipv6_addr_label_cleanup();
6040
6041 rtnl_lock();
6042
6043 __rtnl_af_unregister(&inet6_ops);
6044
6045 /* clean dev list */
6046 for_each_netdev(&init_net, dev) {
6047 if (__in6_dev_get(dev) == NULL)
6048 continue;
6049 addrconf_ifdown(dev, 1);
6050 }
6051 addrconf_ifdown(init_net.loopback_dev, 2);
6052
6053 /*
6054 * Check hash table.
6055 */
6056 spin_lock_bh(&addrconf_hash_lock);
6057 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6058 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6059 spin_unlock_bh(&addrconf_hash_lock);
6060 cancel_delayed_work(&addr_chk_work);
6061 rtnl_unlock();
6062
6063 destroy_workqueue(addrconf_wq);
6064 }
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