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ipv6: reorder ip6_route_dev_notifier after ipv6_dev_notf
[mirror_ubuntu-artful-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/af_ieee802154.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 (ifp->flags&IFA_F_PERMANENT) {
1776 spin_lock_bh(&ifp->lock);
1777 addrconf_del_dad_work(ifp);
1778 ifp->flags |= IFA_F_TENTATIVE;
1779 if (dad_failed)
1780 ifp->flags |= IFA_F_DADFAILED;
1781 spin_unlock_bh(&ifp->lock);
1782 if (dad_failed)
1783 ipv6_ifa_notify(0, ifp);
1784 in6_ifa_put(ifp);
1785 } else if (ifp->flags&IFA_F_TEMPORARY) {
1786 struct inet6_ifaddr *ifpub;
1787 spin_lock_bh(&ifp->lock);
1788 ifpub = ifp->ifpub;
1789 if (ifpub) {
1790 in6_ifa_hold(ifpub);
1791 spin_unlock_bh(&ifp->lock);
1792 ipv6_create_tempaddr(ifpub, ifp);
1793 in6_ifa_put(ifpub);
1794 } else {
1795 spin_unlock_bh(&ifp->lock);
1796 }
1797 ipv6_del_addr(ifp);
1798 } else {
1799 ipv6_del_addr(ifp);
1800 }
1801 }
1802
1803 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1804 {
1805 int err = -ENOENT;
1806
1807 spin_lock_bh(&ifp->lock);
1808 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1809 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1810 err = 0;
1811 }
1812 spin_unlock_bh(&ifp->lock);
1813
1814 return err;
1815 }
1816
1817 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1818 {
1819 struct in6_addr addr;
1820 struct inet6_dev *idev = ifp->idev;
1821 struct net *net = dev_net(ifp->idev->dev);
1822
1823 if (addrconf_dad_end(ifp)) {
1824 in6_ifa_put(ifp);
1825 return;
1826 }
1827
1828 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1829 ifp->idev->dev->name, &ifp->addr);
1830
1831 spin_lock_bh(&ifp->lock);
1832
1833 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1834 int scope = ifp->scope;
1835 u32 flags = ifp->flags;
1836 struct in6_addr new_addr;
1837 struct inet6_ifaddr *ifp2;
1838 u32 valid_lft, preferred_lft;
1839 int pfxlen = ifp->prefix_len;
1840 int retries = ifp->stable_privacy_retry + 1;
1841
1842 if (retries > net->ipv6.sysctl.idgen_retries) {
1843 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1844 ifp->idev->dev->name);
1845 goto errdad;
1846 }
1847
1848 new_addr = ifp->addr;
1849 if (ipv6_generate_stable_address(&new_addr, retries,
1850 idev))
1851 goto errdad;
1852
1853 valid_lft = ifp->valid_lft;
1854 preferred_lft = ifp->prefered_lft;
1855
1856 spin_unlock_bh(&ifp->lock);
1857
1858 if (idev->cnf.max_addresses &&
1859 ipv6_count_addresses(idev) >=
1860 idev->cnf.max_addresses)
1861 goto lock_errdad;
1862
1863 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1864 ifp->idev->dev->name);
1865
1866 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1867 scope, flags, valid_lft,
1868 preferred_lft);
1869 if (IS_ERR(ifp2))
1870 goto lock_errdad;
1871
1872 spin_lock_bh(&ifp2->lock);
1873 ifp2->stable_privacy_retry = retries;
1874 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1875 spin_unlock_bh(&ifp2->lock);
1876
1877 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1878 in6_ifa_put(ifp2);
1879 lock_errdad:
1880 spin_lock_bh(&ifp->lock);
1881 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1882 addr.s6_addr32[0] = htonl(0xfe800000);
1883 addr.s6_addr32[1] = 0;
1884
1885 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1886 ipv6_addr_equal(&ifp->addr, &addr)) {
1887 /* DAD failed for link-local based on MAC address */
1888 idev->cnf.disable_ipv6 = 1;
1889
1890 pr_info("%s: IPv6 being disabled!\n",
1891 ifp->idev->dev->name);
1892 }
1893 }
1894
1895 errdad:
1896 /* transition from _POSTDAD to _ERRDAD */
1897 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1898 spin_unlock_bh(&ifp->lock);
1899
1900 addrconf_mod_dad_work(ifp, 0);
1901 in6_ifa_put(ifp);
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 != IEEE802154_ADDR_LEN)
1958 return -1;
1959 memcpy(eui, dev->dev_addr, 8);
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 case ARPHRD_IEEE802154:
2052 return addrconf_ifid_eui64(eui, dev);
2053 case ARPHRD_IEEE1394:
2054 return addrconf_ifid_ieee1394(eui, dev);
2055 case ARPHRD_TUNNEL6:
2056 return addrconf_ifid_ip6tnl(eui, dev);
2057 }
2058 return -1;
2059 }
2060
2061 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2062 {
2063 int err = -1;
2064 struct inet6_ifaddr *ifp;
2065
2066 read_lock_bh(&idev->lock);
2067 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2068 if (ifp->scope > IFA_LINK)
2069 break;
2070 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2071 memcpy(eui, ifp->addr.s6_addr+8, 8);
2072 err = 0;
2073 break;
2074 }
2075 }
2076 read_unlock_bh(&idev->lock);
2077 return err;
2078 }
2079
2080 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2081 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2082 {
2083 regen:
2084 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2085 idev->rndid[0] &= ~0x02;
2086
2087 /*
2088 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2089 * check if generated address is not inappropriate
2090 *
2091 * - Reserved subnet anycast (RFC 2526)
2092 * 11111101 11....11 1xxxxxxx
2093 * - ISATAP (RFC4214) 6.1
2094 * 00-00-5E-FE-xx-xx-xx-xx
2095 * - value 0
2096 * - XXX: already assigned to an address on the device
2097 */
2098 if (idev->rndid[0] == 0xfd &&
2099 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2100 (idev->rndid[7]&0x80))
2101 goto regen;
2102 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2103 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2104 goto regen;
2105 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2106 goto regen;
2107 }
2108 }
2109
2110 static void ipv6_regen_rndid(unsigned long data)
2111 {
2112 struct inet6_dev *idev = (struct inet6_dev *) data;
2113 unsigned long expires;
2114
2115 rcu_read_lock_bh();
2116 write_lock_bh(&idev->lock);
2117
2118 if (idev->dead)
2119 goto out;
2120
2121 __ipv6_regen_rndid(idev);
2122
2123 expires = jiffies +
2124 idev->cnf.temp_prefered_lft * HZ -
2125 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2126 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2127 idev->cnf.max_desync_factor * HZ;
2128 if (time_before(expires, jiffies)) {
2129 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2130 __func__, idev->dev->name);
2131 goto out;
2132 }
2133
2134 if (!mod_timer(&idev->regen_timer, expires))
2135 in6_dev_hold(idev);
2136
2137 out:
2138 write_unlock_bh(&idev->lock);
2139 rcu_read_unlock_bh();
2140 in6_dev_put(idev);
2141 }
2142
2143 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2144 {
2145 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2146 __ipv6_regen_rndid(idev);
2147 }
2148
2149 /*
2150 * Add prefix route.
2151 */
2152
2153 static void
2154 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2155 unsigned long expires, u32 flags)
2156 {
2157 struct fib6_config cfg = {
2158 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2159 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2160 .fc_ifindex = dev->ifindex,
2161 .fc_expires = expires,
2162 .fc_dst_len = plen,
2163 .fc_flags = RTF_UP | flags,
2164 .fc_nlinfo.nl_net = dev_net(dev),
2165 .fc_protocol = RTPROT_KERNEL,
2166 };
2167
2168 cfg.fc_dst = *pfx;
2169
2170 /* Prevent useless cloning on PtP SIT.
2171 This thing is done here expecting that the whole
2172 class of non-broadcast devices need not cloning.
2173 */
2174 #if IS_ENABLED(CONFIG_IPV6_SIT)
2175 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2176 cfg.fc_flags |= RTF_NONEXTHOP;
2177 #endif
2178
2179 ip6_route_add(&cfg);
2180 }
2181
2182
2183 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2184 int plen,
2185 const struct net_device *dev,
2186 u32 flags, u32 noflags)
2187 {
2188 struct fib6_node *fn;
2189 struct rt6_info *rt = NULL;
2190 struct fib6_table *table;
2191 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2192
2193 table = fib6_get_table(dev_net(dev), tb_id);
2194 if (!table)
2195 return NULL;
2196
2197 read_lock_bh(&table->tb6_lock);
2198 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2199 if (!fn)
2200 goto out;
2201
2202 noflags |= RTF_CACHE;
2203 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2204 if (rt->dst.dev->ifindex != dev->ifindex)
2205 continue;
2206 if ((rt->rt6i_flags & flags) != flags)
2207 continue;
2208 if ((rt->rt6i_flags & noflags) != 0)
2209 continue;
2210 dst_hold(&rt->dst);
2211 break;
2212 }
2213 out:
2214 read_unlock_bh(&table->tb6_lock);
2215 return rt;
2216 }
2217
2218
2219 /* Create "default" multicast route to the interface */
2220
2221 static void addrconf_add_mroute(struct net_device *dev)
2222 {
2223 struct fib6_config cfg = {
2224 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2225 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2226 .fc_ifindex = dev->ifindex,
2227 .fc_dst_len = 8,
2228 .fc_flags = RTF_UP,
2229 .fc_nlinfo.nl_net = dev_net(dev),
2230 };
2231
2232 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2233
2234 ip6_route_add(&cfg);
2235 }
2236
2237 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2238 {
2239 struct inet6_dev *idev;
2240
2241 ASSERT_RTNL();
2242
2243 idev = ipv6_find_idev(dev);
2244 if (!idev)
2245 return ERR_PTR(-ENOBUFS);
2246
2247 if (idev->cnf.disable_ipv6)
2248 return ERR_PTR(-EACCES);
2249
2250 /* Add default multicast route */
2251 if (!(dev->flags & IFF_LOOPBACK))
2252 addrconf_add_mroute(dev);
2253
2254 return idev;
2255 }
2256
2257 static void manage_tempaddrs(struct inet6_dev *idev,
2258 struct inet6_ifaddr *ifp,
2259 __u32 valid_lft, __u32 prefered_lft,
2260 bool create, unsigned long now)
2261 {
2262 u32 flags;
2263 struct inet6_ifaddr *ift;
2264
2265 read_lock_bh(&idev->lock);
2266 /* update all temporary addresses in the list */
2267 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2268 int age, max_valid, max_prefered;
2269
2270 if (ifp != ift->ifpub)
2271 continue;
2272
2273 /* RFC 4941 section 3.3:
2274 * If a received option will extend the lifetime of a public
2275 * address, the lifetimes of temporary addresses should
2276 * be extended, subject to the overall constraint that no
2277 * temporary addresses should ever remain "valid" or "preferred"
2278 * for a time longer than (TEMP_VALID_LIFETIME) or
2279 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2280 */
2281 age = (now - ift->cstamp) / HZ;
2282 max_valid = idev->cnf.temp_valid_lft - age;
2283 if (max_valid < 0)
2284 max_valid = 0;
2285
2286 max_prefered = idev->cnf.temp_prefered_lft -
2287 idev->cnf.max_desync_factor - age;
2288 if (max_prefered < 0)
2289 max_prefered = 0;
2290
2291 if (valid_lft > max_valid)
2292 valid_lft = max_valid;
2293
2294 if (prefered_lft > max_prefered)
2295 prefered_lft = max_prefered;
2296
2297 spin_lock(&ift->lock);
2298 flags = ift->flags;
2299 ift->valid_lft = valid_lft;
2300 ift->prefered_lft = prefered_lft;
2301 ift->tstamp = now;
2302 if (prefered_lft > 0)
2303 ift->flags &= ~IFA_F_DEPRECATED;
2304
2305 spin_unlock(&ift->lock);
2306 if (!(flags&IFA_F_TENTATIVE))
2307 ipv6_ifa_notify(0, ift);
2308 }
2309
2310 if ((create || list_empty(&idev->tempaddr_list)) &&
2311 idev->cnf.use_tempaddr > 0) {
2312 /* When a new public address is created as described
2313 * in [ADDRCONF], also create a new temporary address.
2314 * Also create a temporary address if it's enabled but
2315 * no temporary address currently exists.
2316 */
2317 read_unlock_bh(&idev->lock);
2318 ipv6_create_tempaddr(ifp, NULL);
2319 } else {
2320 read_unlock_bh(&idev->lock);
2321 }
2322 }
2323
2324 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2325 {
2326 struct prefix_info *pinfo;
2327 __u32 valid_lft;
2328 __u32 prefered_lft;
2329 int addr_type;
2330 u32 addr_flags = 0;
2331 struct inet6_dev *in6_dev;
2332 struct net *net = dev_net(dev);
2333
2334 pinfo = (struct prefix_info *) opt;
2335
2336 if (len < sizeof(struct prefix_info)) {
2337 ADBG("addrconf: prefix option too short\n");
2338 return;
2339 }
2340
2341 /*
2342 * Validation checks ([ADDRCONF], page 19)
2343 */
2344
2345 addr_type = ipv6_addr_type(&pinfo->prefix);
2346
2347 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2348 return;
2349
2350 valid_lft = ntohl(pinfo->valid);
2351 prefered_lft = ntohl(pinfo->prefered);
2352
2353 if (prefered_lft > valid_lft) {
2354 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2355 return;
2356 }
2357
2358 in6_dev = in6_dev_get(dev);
2359
2360 if (!in6_dev) {
2361 net_dbg_ratelimited("addrconf: device %s not configured\n",
2362 dev->name);
2363 return;
2364 }
2365
2366 /*
2367 * Two things going on here:
2368 * 1) Add routes for on-link prefixes
2369 * 2) Configure prefixes with the auto flag set
2370 */
2371
2372 if (pinfo->onlink) {
2373 struct rt6_info *rt;
2374 unsigned long rt_expires;
2375
2376 /* Avoid arithmetic overflow. Really, we could
2377 * save rt_expires in seconds, likely valid_lft,
2378 * but it would require division in fib gc, that it
2379 * not good.
2380 */
2381 if (HZ > USER_HZ)
2382 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2383 else
2384 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2385
2386 if (addrconf_finite_timeout(rt_expires))
2387 rt_expires *= HZ;
2388
2389 rt = addrconf_get_prefix_route(&pinfo->prefix,
2390 pinfo->prefix_len,
2391 dev,
2392 RTF_ADDRCONF | RTF_PREFIX_RT,
2393 RTF_GATEWAY | RTF_DEFAULT);
2394
2395 if (rt) {
2396 /* Autoconf prefix route */
2397 if (valid_lft == 0) {
2398 ip6_del_rt(rt);
2399 rt = NULL;
2400 } else if (addrconf_finite_timeout(rt_expires)) {
2401 /* not infinity */
2402 rt6_set_expires(rt, jiffies + rt_expires);
2403 } else {
2404 rt6_clean_expires(rt);
2405 }
2406 } else if (valid_lft) {
2407 clock_t expires = 0;
2408 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2409 if (addrconf_finite_timeout(rt_expires)) {
2410 /* not infinity */
2411 flags |= RTF_EXPIRES;
2412 expires = jiffies_to_clock_t(rt_expires);
2413 }
2414 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2415 dev, expires, flags);
2416 }
2417 ip6_rt_put(rt);
2418 }
2419
2420 /* Try to figure out our local address for this prefix */
2421
2422 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2423 struct inet6_ifaddr *ifp;
2424 struct in6_addr addr;
2425 int create = 0, update_lft = 0;
2426 bool tokenized = false;
2427
2428 if (pinfo->prefix_len == 64) {
2429 memcpy(&addr, &pinfo->prefix, 8);
2430
2431 if (!ipv6_addr_any(&in6_dev->token)) {
2432 read_lock_bh(&in6_dev->lock);
2433 memcpy(addr.s6_addr + 8,
2434 in6_dev->token.s6_addr + 8, 8);
2435 read_unlock_bh(&in6_dev->lock);
2436 tokenized = true;
2437 } else if (in6_dev->addr_gen_mode ==
2438 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2439 !ipv6_generate_stable_address(&addr, 0,
2440 in6_dev)) {
2441 addr_flags |= IFA_F_STABLE_PRIVACY;
2442 goto ok;
2443 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2444 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2445 in6_dev_put(in6_dev);
2446 return;
2447 }
2448 goto ok;
2449 }
2450 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2451 pinfo->prefix_len);
2452 in6_dev_put(in6_dev);
2453 return;
2454
2455 ok:
2456
2457 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2458
2459 if (!ifp && valid_lft) {
2460 int max_addresses = in6_dev->cnf.max_addresses;
2461
2462 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2463 if (in6_dev->cnf.optimistic_dad &&
2464 !net->ipv6.devconf_all->forwarding && sllao)
2465 addr_flags |= IFA_F_OPTIMISTIC;
2466 #endif
2467
2468 /* Do not allow to create too much of autoconfigured
2469 * addresses; this would be too easy way to crash kernel.
2470 */
2471 if (!max_addresses ||
2472 ipv6_count_addresses(in6_dev) < max_addresses)
2473 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2474 pinfo->prefix_len,
2475 addr_type&IPV6_ADDR_SCOPE_MASK,
2476 addr_flags, valid_lft,
2477 prefered_lft);
2478
2479 if (IS_ERR_OR_NULL(ifp)) {
2480 in6_dev_put(in6_dev);
2481 return;
2482 }
2483
2484 update_lft = 0;
2485 create = 1;
2486 spin_lock_bh(&ifp->lock);
2487 ifp->flags |= IFA_F_MANAGETEMPADDR;
2488 ifp->cstamp = jiffies;
2489 ifp->tokenized = tokenized;
2490 spin_unlock_bh(&ifp->lock);
2491 addrconf_dad_start(ifp);
2492 }
2493
2494 if (ifp) {
2495 u32 flags;
2496 unsigned long now;
2497 u32 stored_lft;
2498
2499 /* update lifetime (RFC2462 5.5.3 e) */
2500 spin_lock_bh(&ifp->lock);
2501 now = jiffies;
2502 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2503 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2504 else
2505 stored_lft = 0;
2506 if (!update_lft && !create && stored_lft) {
2507 const u32 minimum_lft = min_t(u32,
2508 stored_lft, MIN_VALID_LIFETIME);
2509 valid_lft = max(valid_lft, minimum_lft);
2510
2511 /* RFC4862 Section 5.5.3e:
2512 * "Note that the preferred lifetime of the
2513 * corresponding address is always reset to
2514 * the Preferred Lifetime in the received
2515 * Prefix Information option, regardless of
2516 * whether the valid lifetime is also reset or
2517 * ignored."
2518 *
2519 * So we should always update prefered_lft here.
2520 */
2521 update_lft = 1;
2522 }
2523
2524 if (update_lft) {
2525 ifp->valid_lft = valid_lft;
2526 ifp->prefered_lft = prefered_lft;
2527 ifp->tstamp = now;
2528 flags = ifp->flags;
2529 ifp->flags &= ~IFA_F_DEPRECATED;
2530 spin_unlock_bh(&ifp->lock);
2531
2532 if (!(flags&IFA_F_TENTATIVE))
2533 ipv6_ifa_notify(0, ifp);
2534 } else
2535 spin_unlock_bh(&ifp->lock);
2536
2537 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2538 create, now);
2539
2540 in6_ifa_put(ifp);
2541 addrconf_verify();
2542 }
2543 }
2544 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2545 in6_dev_put(in6_dev);
2546 }
2547
2548 /*
2549 * Set destination address.
2550 * Special case for SIT interfaces where we create a new "virtual"
2551 * device.
2552 */
2553 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2554 {
2555 struct in6_ifreq ireq;
2556 struct net_device *dev;
2557 int err = -EINVAL;
2558
2559 rtnl_lock();
2560
2561 err = -EFAULT;
2562 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2563 goto err_exit;
2564
2565 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2566
2567 err = -ENODEV;
2568 if (!dev)
2569 goto err_exit;
2570
2571 #if IS_ENABLED(CONFIG_IPV6_SIT)
2572 if (dev->type == ARPHRD_SIT) {
2573 const struct net_device_ops *ops = dev->netdev_ops;
2574 struct ifreq ifr;
2575 struct ip_tunnel_parm p;
2576
2577 err = -EADDRNOTAVAIL;
2578 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2579 goto err_exit;
2580
2581 memset(&p, 0, sizeof(p));
2582 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2583 p.iph.saddr = 0;
2584 p.iph.version = 4;
2585 p.iph.ihl = 5;
2586 p.iph.protocol = IPPROTO_IPV6;
2587 p.iph.ttl = 64;
2588 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2589
2590 if (ops->ndo_do_ioctl) {
2591 mm_segment_t oldfs = get_fs();
2592
2593 set_fs(KERNEL_DS);
2594 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2595 set_fs(oldfs);
2596 } else
2597 err = -EOPNOTSUPP;
2598
2599 if (err == 0) {
2600 err = -ENOBUFS;
2601 dev = __dev_get_by_name(net, p.name);
2602 if (!dev)
2603 goto err_exit;
2604 err = dev_open(dev);
2605 }
2606 }
2607 #endif
2608
2609 err_exit:
2610 rtnl_unlock();
2611 return err;
2612 }
2613
2614 static int ipv6_mc_config(struct sock *sk, bool join,
2615 const struct in6_addr *addr, int ifindex)
2616 {
2617 int ret;
2618
2619 ASSERT_RTNL();
2620
2621 lock_sock(sk);
2622 if (join)
2623 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2624 else
2625 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2626 release_sock(sk);
2627
2628 return ret;
2629 }
2630
2631 /*
2632 * Manual configuration of address on an interface
2633 */
2634 static int inet6_addr_add(struct net *net, int ifindex,
2635 const struct in6_addr *pfx,
2636 const struct in6_addr *peer_pfx,
2637 unsigned int plen, __u32 ifa_flags,
2638 __u32 prefered_lft, __u32 valid_lft)
2639 {
2640 struct inet6_ifaddr *ifp;
2641 struct inet6_dev *idev;
2642 struct net_device *dev;
2643 unsigned long timeout;
2644 clock_t expires;
2645 int scope;
2646 u32 flags;
2647
2648 ASSERT_RTNL();
2649
2650 if (plen > 128)
2651 return -EINVAL;
2652
2653 /* check the lifetime */
2654 if (!valid_lft || prefered_lft > valid_lft)
2655 return -EINVAL;
2656
2657 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2658 return -EINVAL;
2659
2660 dev = __dev_get_by_index(net, ifindex);
2661 if (!dev)
2662 return -ENODEV;
2663
2664 idev = addrconf_add_dev(dev);
2665 if (IS_ERR(idev))
2666 return PTR_ERR(idev);
2667
2668 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2669 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2670 true, pfx, ifindex);
2671
2672 if (ret < 0)
2673 return ret;
2674 }
2675
2676 scope = ipv6_addr_scope(pfx);
2677
2678 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2679 if (addrconf_finite_timeout(timeout)) {
2680 expires = jiffies_to_clock_t(timeout * HZ);
2681 valid_lft = timeout;
2682 flags = RTF_EXPIRES;
2683 } else {
2684 expires = 0;
2685 flags = 0;
2686 ifa_flags |= IFA_F_PERMANENT;
2687 }
2688
2689 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2690 if (addrconf_finite_timeout(timeout)) {
2691 if (timeout == 0)
2692 ifa_flags |= IFA_F_DEPRECATED;
2693 prefered_lft = timeout;
2694 }
2695
2696 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2697 valid_lft, prefered_lft);
2698
2699 if (!IS_ERR(ifp)) {
2700 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2701 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2702 expires, flags);
2703 }
2704
2705 /*
2706 * Note that section 3.1 of RFC 4429 indicates
2707 * that the Optimistic flag should not be set for
2708 * manually configured addresses
2709 */
2710 addrconf_dad_start(ifp);
2711 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2712 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2713 true, jiffies);
2714 in6_ifa_put(ifp);
2715 addrconf_verify_rtnl();
2716 return 0;
2717 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2718 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2719 false, pfx, ifindex);
2720 }
2721
2722 return PTR_ERR(ifp);
2723 }
2724
2725 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2726 const struct in6_addr *pfx, unsigned int plen)
2727 {
2728 struct inet6_ifaddr *ifp;
2729 struct inet6_dev *idev;
2730 struct net_device *dev;
2731
2732 if (plen > 128)
2733 return -EINVAL;
2734
2735 dev = __dev_get_by_index(net, ifindex);
2736 if (!dev)
2737 return -ENODEV;
2738
2739 idev = __in6_dev_get(dev);
2740 if (!idev)
2741 return -ENXIO;
2742
2743 read_lock_bh(&idev->lock);
2744 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2745 if (ifp->prefix_len == plen &&
2746 ipv6_addr_equal(pfx, &ifp->addr)) {
2747 in6_ifa_hold(ifp);
2748 read_unlock_bh(&idev->lock);
2749
2750 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2751 (ifa_flags & IFA_F_MANAGETEMPADDR))
2752 manage_tempaddrs(idev, ifp, 0, 0, false,
2753 jiffies);
2754 ipv6_del_addr(ifp);
2755 addrconf_verify_rtnl();
2756 if (ipv6_addr_is_multicast(pfx)) {
2757 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2758 false, pfx, dev->ifindex);
2759 }
2760 return 0;
2761 }
2762 }
2763 read_unlock_bh(&idev->lock);
2764 return -EADDRNOTAVAIL;
2765 }
2766
2767
2768 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2769 {
2770 struct in6_ifreq ireq;
2771 int err;
2772
2773 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2774 return -EPERM;
2775
2776 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2777 return -EFAULT;
2778
2779 rtnl_lock();
2780 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2781 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2782 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2783 rtnl_unlock();
2784 return err;
2785 }
2786
2787 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2788 {
2789 struct in6_ifreq ireq;
2790 int err;
2791
2792 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2793 return -EPERM;
2794
2795 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2796 return -EFAULT;
2797
2798 rtnl_lock();
2799 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2800 ireq.ifr6_prefixlen);
2801 rtnl_unlock();
2802 return err;
2803 }
2804
2805 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2806 int plen, int scope)
2807 {
2808 struct inet6_ifaddr *ifp;
2809
2810 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2811 scope, IFA_F_PERMANENT,
2812 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2813 if (!IS_ERR(ifp)) {
2814 spin_lock_bh(&ifp->lock);
2815 ifp->flags &= ~IFA_F_TENTATIVE;
2816 spin_unlock_bh(&ifp->lock);
2817 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2818 in6_ifa_put(ifp);
2819 }
2820 }
2821
2822 #if IS_ENABLED(CONFIG_IPV6_SIT)
2823 static void sit_add_v4_addrs(struct inet6_dev *idev)
2824 {
2825 struct in6_addr addr;
2826 struct net_device *dev;
2827 struct net *net = dev_net(idev->dev);
2828 int scope, plen;
2829 u32 pflags = 0;
2830
2831 ASSERT_RTNL();
2832
2833 memset(&addr, 0, sizeof(struct in6_addr));
2834 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2835
2836 if (idev->dev->flags&IFF_POINTOPOINT) {
2837 addr.s6_addr32[0] = htonl(0xfe800000);
2838 scope = IFA_LINK;
2839 plen = 64;
2840 } else {
2841 scope = IPV6_ADDR_COMPATv4;
2842 plen = 96;
2843 pflags |= RTF_NONEXTHOP;
2844 }
2845
2846 if (addr.s6_addr32[3]) {
2847 add_addr(idev, &addr, plen, scope);
2848 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2849 return;
2850 }
2851
2852 for_each_netdev(net, dev) {
2853 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2854 if (in_dev && (dev->flags & IFF_UP)) {
2855 struct in_ifaddr *ifa;
2856
2857 int flag = scope;
2858
2859 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2860
2861 addr.s6_addr32[3] = ifa->ifa_local;
2862
2863 if (ifa->ifa_scope == RT_SCOPE_LINK)
2864 continue;
2865 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2866 if (idev->dev->flags&IFF_POINTOPOINT)
2867 continue;
2868 flag |= IFA_HOST;
2869 }
2870
2871 add_addr(idev, &addr, plen, flag);
2872 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2873 pflags);
2874 }
2875 }
2876 }
2877 }
2878 #endif
2879
2880 static void init_loopback(struct net_device *dev)
2881 {
2882 struct inet6_dev *idev;
2883 struct net_device *sp_dev;
2884 struct inet6_ifaddr *sp_ifa;
2885 struct rt6_info *sp_rt;
2886
2887 /* ::1 */
2888
2889 ASSERT_RTNL();
2890
2891 idev = ipv6_find_idev(dev);
2892 if (!idev) {
2893 pr_debug("%s: add_dev failed\n", __func__);
2894 return;
2895 }
2896
2897 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2898
2899 /* Add routes to other interface's IPv6 addresses */
2900 for_each_netdev(dev_net(dev), sp_dev) {
2901 if (!strcmp(sp_dev->name, dev->name))
2902 continue;
2903
2904 idev = __in6_dev_get(sp_dev);
2905 if (!idev)
2906 continue;
2907
2908 read_lock_bh(&idev->lock);
2909 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2910
2911 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2912 continue;
2913
2914 if (sp_ifa->rt) {
2915 /* This dst has been added to garbage list when
2916 * lo device down, release this obsolete dst and
2917 * reallocate a new router for ifa.
2918 */
2919 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
2920 ip6_rt_put(sp_ifa->rt);
2921 sp_ifa->rt = NULL;
2922 } else {
2923 continue;
2924 }
2925 }
2926
2927 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2928
2929 /* Failure cases are ignored */
2930 if (!IS_ERR(sp_rt)) {
2931 sp_ifa->rt = sp_rt;
2932 ip6_ins_rt(sp_rt);
2933 }
2934 }
2935 read_unlock_bh(&idev->lock);
2936 }
2937 }
2938
2939 static void addrconf_add_linklocal(struct inet6_dev *idev,
2940 const struct in6_addr *addr, u32 flags)
2941 {
2942 struct inet6_ifaddr *ifp;
2943 u32 addr_flags = flags | IFA_F_PERMANENT;
2944
2945 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2946 if (idev->cnf.optimistic_dad &&
2947 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2948 addr_flags |= IFA_F_OPTIMISTIC;
2949 #endif
2950
2951 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2952 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2953 if (!IS_ERR(ifp)) {
2954 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2955 addrconf_dad_start(ifp);
2956 in6_ifa_put(ifp);
2957 }
2958 }
2959
2960 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2961 {
2962 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2963 return true;
2964
2965 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2966 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2967 return true;
2968
2969 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2970 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2971 return true;
2972
2973 return false;
2974 }
2975
2976 static int ipv6_generate_stable_address(struct in6_addr *address,
2977 u8 dad_count,
2978 const struct inet6_dev *idev)
2979 {
2980 static DEFINE_SPINLOCK(lock);
2981 static __u32 digest[SHA_DIGEST_WORDS];
2982 static __u32 workspace[SHA_WORKSPACE_WORDS];
2983
2984 static union {
2985 char __data[SHA_MESSAGE_BYTES];
2986 struct {
2987 struct in6_addr secret;
2988 __be32 prefix[2];
2989 unsigned char hwaddr[MAX_ADDR_LEN];
2990 u8 dad_count;
2991 } __packed;
2992 } data;
2993
2994 struct in6_addr secret;
2995 struct in6_addr temp;
2996 struct net *net = dev_net(idev->dev);
2997
2998 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2999
3000 if (idev->cnf.stable_secret.initialized)
3001 secret = idev->cnf.stable_secret.secret;
3002 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3003 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3004 else
3005 return -1;
3006
3007 retry:
3008 spin_lock_bh(&lock);
3009
3010 sha_init(digest);
3011 memset(&data, 0, sizeof(data));
3012 memset(workspace, 0, sizeof(workspace));
3013 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3014 data.prefix[0] = address->s6_addr32[0];
3015 data.prefix[1] = address->s6_addr32[1];
3016 data.secret = secret;
3017 data.dad_count = dad_count;
3018
3019 sha_transform(digest, data.__data, workspace);
3020
3021 temp = *address;
3022 temp.s6_addr32[2] = (__force __be32)digest[0];
3023 temp.s6_addr32[3] = (__force __be32)digest[1];
3024
3025 spin_unlock_bh(&lock);
3026
3027 if (ipv6_reserved_interfaceid(temp)) {
3028 dad_count++;
3029 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3030 return -1;
3031 goto retry;
3032 }
3033
3034 *address = temp;
3035 return 0;
3036 }
3037
3038 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3039 {
3040 struct in6_addr addr;
3041
3042 /* no link local addresses on L3 master devices */
3043 if (netif_is_l3_master(idev->dev))
3044 return;
3045
3046 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3047
3048 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3049 if (!ipv6_generate_stable_address(&addr, 0, idev))
3050 addrconf_add_linklocal(idev, &addr,
3051 IFA_F_STABLE_PRIVACY);
3052 else if (prefix_route)
3053 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3054 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3055 /* addrconf_add_linklocal also adds a prefix_route and we
3056 * only need to care about prefix routes if ipv6_generate_eui64
3057 * couldn't generate one.
3058 */
3059 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3060 addrconf_add_linklocal(idev, &addr, 0);
3061 else if (prefix_route)
3062 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3063 }
3064 }
3065
3066 static void addrconf_dev_config(struct net_device *dev)
3067 {
3068 struct inet6_dev *idev;
3069
3070 ASSERT_RTNL();
3071
3072 if ((dev->type != ARPHRD_ETHER) &&
3073 (dev->type != ARPHRD_FDDI) &&
3074 (dev->type != ARPHRD_ARCNET) &&
3075 (dev->type != ARPHRD_INFINIBAND) &&
3076 (dev->type != ARPHRD_IEEE802154) &&
3077 (dev->type != ARPHRD_IEEE1394) &&
3078 (dev->type != ARPHRD_TUNNEL6) &&
3079 (dev->type != ARPHRD_6LOWPAN)) {
3080 /* Alas, we support only Ethernet autoconfiguration. */
3081 return;
3082 }
3083
3084 idev = addrconf_add_dev(dev);
3085 if (IS_ERR(idev))
3086 return;
3087
3088 addrconf_addr_gen(idev, false);
3089 }
3090
3091 #if IS_ENABLED(CONFIG_IPV6_SIT)
3092 static void addrconf_sit_config(struct net_device *dev)
3093 {
3094 struct inet6_dev *idev;
3095
3096 ASSERT_RTNL();
3097
3098 /*
3099 * Configure the tunnel with one of our IPv4
3100 * addresses... we should configure all of
3101 * our v4 addrs in the tunnel
3102 */
3103
3104 idev = ipv6_find_idev(dev);
3105 if (!idev) {
3106 pr_debug("%s: add_dev failed\n", __func__);
3107 return;
3108 }
3109
3110 if (dev->priv_flags & IFF_ISATAP) {
3111 addrconf_addr_gen(idev, false);
3112 return;
3113 }
3114
3115 sit_add_v4_addrs(idev);
3116
3117 if (dev->flags&IFF_POINTOPOINT)
3118 addrconf_add_mroute(dev);
3119 }
3120 #endif
3121
3122 #if IS_ENABLED(CONFIG_NET_IPGRE)
3123 static void addrconf_gre_config(struct net_device *dev)
3124 {
3125 struct inet6_dev *idev;
3126
3127 ASSERT_RTNL();
3128
3129 idev = ipv6_find_idev(dev);
3130 if (!idev) {
3131 pr_debug("%s: add_dev failed\n", __func__);
3132 return;
3133 }
3134
3135 addrconf_addr_gen(idev, true);
3136 if (dev->flags & IFF_POINTOPOINT)
3137 addrconf_add_mroute(dev);
3138 }
3139 #endif
3140
3141 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3142 void *ptr)
3143 {
3144 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3145 struct inet6_dev *idev = __in6_dev_get(dev);
3146 int run_pending = 0;
3147 int err;
3148
3149 switch (event) {
3150 case NETDEV_REGISTER:
3151 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3152 idev = ipv6_add_dev(dev);
3153 if (IS_ERR(idev))
3154 return notifier_from_errno(PTR_ERR(idev));
3155 }
3156 break;
3157
3158 case NETDEV_CHANGEMTU:
3159 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3160 if (dev->mtu < IPV6_MIN_MTU) {
3161 addrconf_ifdown(dev, 1);
3162 break;
3163 }
3164
3165 if (idev) {
3166 rt6_mtu_change(dev, dev->mtu);
3167 idev->cnf.mtu6 = dev->mtu;
3168 break;
3169 }
3170
3171 /* allocate new idev */
3172 idev = ipv6_add_dev(dev);
3173 if (IS_ERR(idev))
3174 break;
3175
3176 /* device is still not ready */
3177 if (!(idev->if_flags & IF_READY))
3178 break;
3179
3180 run_pending = 1;
3181
3182 /* fall through */
3183
3184 case NETDEV_UP:
3185 case NETDEV_CHANGE:
3186 if (dev->flags & IFF_SLAVE)
3187 break;
3188
3189 if (idev && idev->cnf.disable_ipv6)
3190 break;
3191
3192 if (event == NETDEV_UP) {
3193 if (!addrconf_qdisc_ok(dev)) {
3194 /* device is not ready yet. */
3195 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3196 dev->name);
3197 break;
3198 }
3199
3200 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3201 idev = ipv6_add_dev(dev);
3202
3203 if (!IS_ERR_OR_NULL(idev)) {
3204 idev->if_flags |= IF_READY;
3205 run_pending = 1;
3206 }
3207 } else if (event == NETDEV_CHANGE) {
3208 if (!addrconf_qdisc_ok(dev)) {
3209 /* device is still not ready. */
3210 break;
3211 }
3212
3213 if (idev) {
3214 if (idev->if_flags & IF_READY)
3215 /* device is already configured. */
3216 break;
3217 idev->if_flags |= IF_READY;
3218 }
3219
3220 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3221 dev->name);
3222
3223 run_pending = 1;
3224 }
3225
3226 switch (dev->type) {
3227 #if IS_ENABLED(CONFIG_IPV6_SIT)
3228 case ARPHRD_SIT:
3229 addrconf_sit_config(dev);
3230 break;
3231 #endif
3232 #if IS_ENABLED(CONFIG_NET_IPGRE)
3233 case ARPHRD_IPGRE:
3234 addrconf_gre_config(dev);
3235 break;
3236 #endif
3237 case ARPHRD_LOOPBACK:
3238 init_loopback(dev);
3239 break;
3240
3241 default:
3242 addrconf_dev_config(dev);
3243 break;
3244 }
3245
3246 if (!IS_ERR_OR_NULL(idev)) {
3247 if (run_pending)
3248 addrconf_dad_run(idev);
3249
3250 /*
3251 * If the MTU changed during the interface down,
3252 * when the interface up, the changed MTU must be
3253 * reflected in the idev as well as routers.
3254 */
3255 if (idev->cnf.mtu6 != dev->mtu &&
3256 dev->mtu >= IPV6_MIN_MTU) {
3257 rt6_mtu_change(dev, dev->mtu);
3258 idev->cnf.mtu6 = dev->mtu;
3259 }
3260 idev->tstamp = jiffies;
3261 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3262
3263 /*
3264 * If the changed mtu during down is lower than
3265 * IPV6_MIN_MTU stop IPv6 on this interface.
3266 */
3267 if (dev->mtu < IPV6_MIN_MTU)
3268 addrconf_ifdown(dev, 1);
3269 }
3270 break;
3271
3272 case NETDEV_DOWN:
3273 case NETDEV_UNREGISTER:
3274 /*
3275 * Remove all addresses from this interface.
3276 */
3277 addrconf_ifdown(dev, event != NETDEV_DOWN);
3278 break;
3279
3280 case NETDEV_CHANGENAME:
3281 if (idev) {
3282 snmp6_unregister_dev(idev);
3283 addrconf_sysctl_unregister(idev);
3284 err = addrconf_sysctl_register(idev);
3285 if (err)
3286 return notifier_from_errno(err);
3287 err = snmp6_register_dev(idev);
3288 if (err) {
3289 addrconf_sysctl_unregister(idev);
3290 return notifier_from_errno(err);
3291 }
3292 }
3293 break;
3294
3295 case NETDEV_PRE_TYPE_CHANGE:
3296 case NETDEV_POST_TYPE_CHANGE:
3297 addrconf_type_change(dev, event);
3298 break;
3299 }
3300
3301 return NOTIFY_OK;
3302 }
3303
3304 /*
3305 * addrconf module should be notified of a device going up
3306 */
3307 static struct notifier_block ipv6_dev_notf = {
3308 .notifier_call = addrconf_notify,
3309 .priority = ADDRCONF_NOTIFY_PRIORITY,
3310 };
3311
3312 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3313 {
3314 struct inet6_dev *idev;
3315 ASSERT_RTNL();
3316
3317 idev = __in6_dev_get(dev);
3318
3319 if (event == NETDEV_POST_TYPE_CHANGE)
3320 ipv6_mc_remap(idev);
3321 else if (event == NETDEV_PRE_TYPE_CHANGE)
3322 ipv6_mc_unmap(idev);
3323 }
3324
3325 static int addrconf_ifdown(struct net_device *dev, int how)
3326 {
3327 struct net *net = dev_net(dev);
3328 struct inet6_dev *idev;
3329 struct inet6_ifaddr *ifa;
3330 int state, i;
3331
3332 ASSERT_RTNL();
3333
3334 rt6_ifdown(net, dev);
3335 neigh_ifdown(&nd_tbl, dev);
3336
3337 idev = __in6_dev_get(dev);
3338 if (!idev)
3339 return -ENODEV;
3340
3341 /*
3342 * Step 1: remove reference to ipv6 device from parent device.
3343 * Do not dev_put!
3344 */
3345 if (how) {
3346 idev->dead = 1;
3347
3348 /* protected by rtnl_lock */
3349 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3350
3351 /* Step 1.5: remove snmp6 entry */
3352 snmp6_unregister_dev(idev);
3353
3354 }
3355
3356 /* Step 2: clear hash table */
3357 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3358 struct hlist_head *h = &inet6_addr_lst[i];
3359
3360 spin_lock_bh(&addrconf_hash_lock);
3361 restart:
3362 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3363 if (ifa->idev == idev) {
3364 hlist_del_init_rcu(&ifa->addr_lst);
3365 addrconf_del_dad_work(ifa);
3366 goto restart;
3367 }
3368 }
3369 spin_unlock_bh(&addrconf_hash_lock);
3370 }
3371
3372 write_lock_bh(&idev->lock);
3373
3374 addrconf_del_rs_timer(idev);
3375
3376 /* Step 2: clear flags for stateless addrconf */
3377 if (!how)
3378 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3379
3380 if (how && del_timer(&idev->regen_timer))
3381 in6_dev_put(idev);
3382
3383 /* Step 3: clear tempaddr list */
3384 while (!list_empty(&idev->tempaddr_list)) {
3385 ifa = list_first_entry(&idev->tempaddr_list,
3386 struct inet6_ifaddr, tmp_list);
3387 list_del(&ifa->tmp_list);
3388 write_unlock_bh(&idev->lock);
3389 spin_lock_bh(&ifa->lock);
3390
3391 if (ifa->ifpub) {
3392 in6_ifa_put(ifa->ifpub);
3393 ifa->ifpub = NULL;
3394 }
3395 spin_unlock_bh(&ifa->lock);
3396 in6_ifa_put(ifa);
3397 write_lock_bh(&idev->lock);
3398 }
3399
3400 while (!list_empty(&idev->addr_list)) {
3401 ifa = list_first_entry(&idev->addr_list,
3402 struct inet6_ifaddr, if_list);
3403 addrconf_del_dad_work(ifa);
3404
3405 list_del(&ifa->if_list);
3406
3407 write_unlock_bh(&idev->lock);
3408
3409 spin_lock_bh(&ifa->lock);
3410 state = ifa->state;
3411 ifa->state = INET6_IFADDR_STATE_DEAD;
3412 spin_unlock_bh(&ifa->lock);
3413
3414 if (state != INET6_IFADDR_STATE_DEAD) {
3415 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3416 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3417 }
3418 in6_ifa_put(ifa);
3419
3420 write_lock_bh(&idev->lock);
3421 }
3422
3423 write_unlock_bh(&idev->lock);
3424
3425 /* Step 5: Discard anycast and multicast list */
3426 if (how) {
3427 ipv6_ac_destroy_dev(idev);
3428 ipv6_mc_destroy_dev(idev);
3429 } else {
3430 ipv6_mc_down(idev);
3431 }
3432
3433 idev->tstamp = jiffies;
3434
3435 /* Last: Shot the device (if unregistered) */
3436 if (how) {
3437 addrconf_sysctl_unregister(idev);
3438 neigh_parms_release(&nd_tbl, idev->nd_parms);
3439 neigh_ifdown(&nd_tbl, dev);
3440 in6_dev_put(idev);
3441 }
3442 return 0;
3443 }
3444
3445 static void addrconf_rs_timer(unsigned long data)
3446 {
3447 struct inet6_dev *idev = (struct inet6_dev *)data;
3448 struct net_device *dev = idev->dev;
3449 struct in6_addr lladdr;
3450
3451 write_lock(&idev->lock);
3452 if (idev->dead || !(idev->if_flags & IF_READY))
3453 goto out;
3454
3455 if (!ipv6_accept_ra(idev))
3456 goto out;
3457
3458 /* Announcement received after solicitation was sent */
3459 if (idev->if_flags & IF_RA_RCVD)
3460 goto out;
3461
3462 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3463 write_unlock(&idev->lock);
3464 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3465 ndisc_send_rs(dev, &lladdr,
3466 &in6addr_linklocal_allrouters);
3467 else
3468 goto put;
3469
3470 write_lock(&idev->lock);
3471 /* The wait after the last probe can be shorter */
3472 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3473 idev->cnf.rtr_solicits) ?
3474 idev->cnf.rtr_solicit_delay :
3475 idev->cnf.rtr_solicit_interval);
3476 } else {
3477 /*
3478 * Note: we do not support deprecated "all on-link"
3479 * assumption any longer.
3480 */
3481 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3482 }
3483
3484 out:
3485 write_unlock(&idev->lock);
3486 put:
3487 in6_dev_put(idev);
3488 }
3489
3490 /*
3491 * Duplicate Address Detection
3492 */
3493 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3494 {
3495 unsigned long rand_num;
3496 struct inet6_dev *idev = ifp->idev;
3497
3498 if (ifp->flags & IFA_F_OPTIMISTIC)
3499 rand_num = 0;
3500 else
3501 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3502
3503 ifp->dad_probes = idev->cnf.dad_transmits;
3504 addrconf_mod_dad_work(ifp, rand_num);
3505 }
3506
3507 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3508 {
3509 struct inet6_dev *idev = ifp->idev;
3510 struct net_device *dev = idev->dev;
3511 bool notify = false;
3512
3513 addrconf_join_solict(dev, &ifp->addr);
3514
3515 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3516
3517 read_lock_bh(&idev->lock);
3518 spin_lock(&ifp->lock);
3519 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3520 goto out;
3521
3522 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3523 idev->cnf.accept_dad < 1 ||
3524 !(ifp->flags&IFA_F_TENTATIVE) ||
3525 ifp->flags & IFA_F_NODAD) {
3526 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3527 spin_unlock(&ifp->lock);
3528 read_unlock_bh(&idev->lock);
3529
3530 addrconf_dad_completed(ifp);
3531 return;
3532 }
3533
3534 if (!(idev->if_flags & IF_READY)) {
3535 spin_unlock(&ifp->lock);
3536 read_unlock_bh(&idev->lock);
3537 /*
3538 * If the device is not ready:
3539 * - keep it tentative if it is a permanent address.
3540 * - otherwise, kill it.
3541 */
3542 in6_ifa_hold(ifp);
3543 addrconf_dad_stop(ifp, 0);
3544 return;
3545 }
3546
3547 /*
3548 * Optimistic nodes can start receiving
3549 * Frames right away
3550 */
3551 if (ifp->flags & IFA_F_OPTIMISTIC) {
3552 ip6_ins_rt(ifp->rt);
3553 if (ipv6_use_optimistic_addr(idev)) {
3554 /* Because optimistic nodes can use this address,
3555 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3556 */
3557 notify = true;
3558 }
3559 }
3560
3561 addrconf_dad_kick(ifp);
3562 out:
3563 spin_unlock(&ifp->lock);
3564 read_unlock_bh(&idev->lock);
3565 if (notify)
3566 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3567 }
3568
3569 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3570 {
3571 bool begin_dad = false;
3572
3573 spin_lock_bh(&ifp->lock);
3574 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3575 ifp->state = INET6_IFADDR_STATE_PREDAD;
3576 begin_dad = true;
3577 }
3578 spin_unlock_bh(&ifp->lock);
3579
3580 if (begin_dad)
3581 addrconf_mod_dad_work(ifp, 0);
3582 }
3583
3584 static void addrconf_dad_work(struct work_struct *w)
3585 {
3586 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3587 struct inet6_ifaddr,
3588 dad_work);
3589 struct inet6_dev *idev = ifp->idev;
3590 struct in6_addr mcaddr;
3591
3592 enum {
3593 DAD_PROCESS,
3594 DAD_BEGIN,
3595 DAD_ABORT,
3596 } action = DAD_PROCESS;
3597
3598 rtnl_lock();
3599
3600 spin_lock_bh(&ifp->lock);
3601 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3602 action = DAD_BEGIN;
3603 ifp->state = INET6_IFADDR_STATE_DAD;
3604 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3605 action = DAD_ABORT;
3606 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3607 }
3608 spin_unlock_bh(&ifp->lock);
3609
3610 if (action == DAD_BEGIN) {
3611 addrconf_dad_begin(ifp);
3612 goto out;
3613 } else if (action == DAD_ABORT) {
3614 in6_ifa_hold(ifp);
3615 addrconf_dad_stop(ifp, 1);
3616 goto out;
3617 }
3618
3619 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3620 goto out;
3621
3622 write_lock_bh(&idev->lock);
3623 if (idev->dead || !(idev->if_flags & IF_READY)) {
3624 write_unlock_bh(&idev->lock);
3625 goto out;
3626 }
3627
3628 spin_lock(&ifp->lock);
3629 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3630 spin_unlock(&ifp->lock);
3631 write_unlock_bh(&idev->lock);
3632 goto out;
3633 }
3634
3635 if (ifp->dad_probes == 0) {
3636 /*
3637 * DAD was successful
3638 */
3639
3640 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3641 spin_unlock(&ifp->lock);
3642 write_unlock_bh(&idev->lock);
3643
3644 addrconf_dad_completed(ifp);
3645
3646 goto out;
3647 }
3648
3649 ifp->dad_probes--;
3650 addrconf_mod_dad_work(ifp,
3651 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3652 spin_unlock(&ifp->lock);
3653 write_unlock_bh(&idev->lock);
3654
3655 /* send a neighbour solicitation for our addr */
3656 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3657 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3658 out:
3659 in6_ifa_put(ifp);
3660 rtnl_unlock();
3661 }
3662
3663 /* ifp->idev must be at least read locked */
3664 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3665 {
3666 struct inet6_ifaddr *ifpiter;
3667 struct inet6_dev *idev = ifp->idev;
3668
3669 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3670 if (ifpiter->scope > IFA_LINK)
3671 break;
3672 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3673 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3674 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3675 IFA_F_PERMANENT)
3676 return false;
3677 }
3678 return true;
3679 }
3680
3681 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3682 {
3683 struct net_device *dev = ifp->idev->dev;
3684 struct in6_addr lladdr;
3685 bool send_rs, send_mld;
3686
3687 addrconf_del_dad_work(ifp);
3688
3689 /*
3690 * Configure the address for reception. Now it is valid.
3691 */
3692
3693 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3694
3695 /* If added prefix is link local and we are prepared to process
3696 router advertisements, start sending router solicitations.
3697 */
3698
3699 read_lock_bh(&ifp->idev->lock);
3700 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3701 send_rs = send_mld &&
3702 ipv6_accept_ra(ifp->idev) &&
3703 ifp->idev->cnf.rtr_solicits > 0 &&
3704 (dev->flags&IFF_LOOPBACK) == 0;
3705 read_unlock_bh(&ifp->idev->lock);
3706
3707 /* While dad is in progress mld report's source address is in6_addrany.
3708 * Resend with proper ll now.
3709 */
3710 if (send_mld)
3711 ipv6_mc_dad_complete(ifp->idev);
3712
3713 if (send_rs) {
3714 /*
3715 * If a host as already performed a random delay
3716 * [...] as part of DAD [...] there is no need
3717 * to delay again before sending the first RS
3718 */
3719 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3720 return;
3721 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3722
3723 write_lock_bh(&ifp->idev->lock);
3724 spin_lock(&ifp->lock);
3725 ifp->idev->rs_probes = 1;
3726 ifp->idev->if_flags |= IF_RS_SENT;
3727 addrconf_mod_rs_timer(ifp->idev,
3728 ifp->idev->cnf.rtr_solicit_interval);
3729 spin_unlock(&ifp->lock);
3730 write_unlock_bh(&ifp->idev->lock);
3731 }
3732 }
3733
3734 static void addrconf_dad_run(struct inet6_dev *idev)
3735 {
3736 struct inet6_ifaddr *ifp;
3737
3738 read_lock_bh(&idev->lock);
3739 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3740 spin_lock(&ifp->lock);
3741 if (ifp->flags & IFA_F_TENTATIVE &&
3742 ifp->state == INET6_IFADDR_STATE_DAD)
3743 addrconf_dad_kick(ifp);
3744 spin_unlock(&ifp->lock);
3745 }
3746 read_unlock_bh(&idev->lock);
3747 }
3748
3749 #ifdef CONFIG_PROC_FS
3750 struct if6_iter_state {
3751 struct seq_net_private p;
3752 int bucket;
3753 int offset;
3754 };
3755
3756 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3757 {
3758 struct inet6_ifaddr *ifa = NULL;
3759 struct if6_iter_state *state = seq->private;
3760 struct net *net = seq_file_net(seq);
3761 int p = 0;
3762
3763 /* initial bucket if pos is 0 */
3764 if (pos == 0) {
3765 state->bucket = 0;
3766 state->offset = 0;
3767 }
3768
3769 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3770 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3771 addr_lst) {
3772 if (!net_eq(dev_net(ifa->idev->dev), net))
3773 continue;
3774 /* sync with offset */
3775 if (p < state->offset) {
3776 p++;
3777 continue;
3778 }
3779 state->offset++;
3780 return ifa;
3781 }
3782
3783 /* prepare for next bucket */
3784 state->offset = 0;
3785 p = 0;
3786 }
3787 return NULL;
3788 }
3789
3790 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3791 struct inet6_ifaddr *ifa)
3792 {
3793 struct if6_iter_state *state = seq->private;
3794 struct net *net = seq_file_net(seq);
3795
3796 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3797 if (!net_eq(dev_net(ifa->idev->dev), net))
3798 continue;
3799 state->offset++;
3800 return ifa;
3801 }
3802
3803 while (++state->bucket < IN6_ADDR_HSIZE) {
3804 state->offset = 0;
3805 hlist_for_each_entry_rcu_bh(ifa,
3806 &inet6_addr_lst[state->bucket], addr_lst) {
3807 if (!net_eq(dev_net(ifa->idev->dev), net))
3808 continue;
3809 state->offset++;
3810 return ifa;
3811 }
3812 }
3813
3814 return NULL;
3815 }
3816
3817 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3818 __acquires(rcu_bh)
3819 {
3820 rcu_read_lock_bh();
3821 return if6_get_first(seq, *pos);
3822 }
3823
3824 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3825 {
3826 struct inet6_ifaddr *ifa;
3827
3828 ifa = if6_get_next(seq, v);
3829 ++*pos;
3830 return ifa;
3831 }
3832
3833 static void if6_seq_stop(struct seq_file *seq, void *v)
3834 __releases(rcu_bh)
3835 {
3836 rcu_read_unlock_bh();
3837 }
3838
3839 static int if6_seq_show(struct seq_file *seq, void *v)
3840 {
3841 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3842 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3843 &ifp->addr,
3844 ifp->idev->dev->ifindex,
3845 ifp->prefix_len,
3846 ifp->scope,
3847 (u8) ifp->flags,
3848 ifp->idev->dev->name);
3849 return 0;
3850 }
3851
3852 static const struct seq_operations if6_seq_ops = {
3853 .start = if6_seq_start,
3854 .next = if6_seq_next,
3855 .show = if6_seq_show,
3856 .stop = if6_seq_stop,
3857 };
3858
3859 static int if6_seq_open(struct inode *inode, struct file *file)
3860 {
3861 return seq_open_net(inode, file, &if6_seq_ops,
3862 sizeof(struct if6_iter_state));
3863 }
3864
3865 static const struct file_operations if6_fops = {
3866 .owner = THIS_MODULE,
3867 .open = if6_seq_open,
3868 .read = seq_read,
3869 .llseek = seq_lseek,
3870 .release = seq_release_net,
3871 };
3872
3873 static int __net_init if6_proc_net_init(struct net *net)
3874 {
3875 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3876 return -ENOMEM;
3877 return 0;
3878 }
3879
3880 static void __net_exit if6_proc_net_exit(struct net *net)
3881 {
3882 remove_proc_entry("if_inet6", net->proc_net);
3883 }
3884
3885 static struct pernet_operations if6_proc_net_ops = {
3886 .init = if6_proc_net_init,
3887 .exit = if6_proc_net_exit,
3888 };
3889
3890 int __init if6_proc_init(void)
3891 {
3892 return register_pernet_subsys(&if6_proc_net_ops);
3893 }
3894
3895 void if6_proc_exit(void)
3896 {
3897 unregister_pernet_subsys(&if6_proc_net_ops);
3898 }
3899 #endif /* CONFIG_PROC_FS */
3900
3901 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3902 /* Check if address is a home address configured on any interface. */
3903 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3904 {
3905 int ret = 0;
3906 struct inet6_ifaddr *ifp = NULL;
3907 unsigned int hash = inet6_addr_hash(addr);
3908
3909 rcu_read_lock_bh();
3910 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3911 if (!net_eq(dev_net(ifp->idev->dev), net))
3912 continue;
3913 if (ipv6_addr_equal(&ifp->addr, addr) &&
3914 (ifp->flags & IFA_F_HOMEADDRESS)) {
3915 ret = 1;
3916 break;
3917 }
3918 }
3919 rcu_read_unlock_bh();
3920 return ret;
3921 }
3922 #endif
3923
3924 /*
3925 * Periodic address status verification
3926 */
3927
3928 static void addrconf_verify_rtnl(void)
3929 {
3930 unsigned long now, next, next_sec, next_sched;
3931 struct inet6_ifaddr *ifp;
3932 int i;
3933
3934 ASSERT_RTNL();
3935
3936 rcu_read_lock_bh();
3937 now = jiffies;
3938 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3939
3940 cancel_delayed_work(&addr_chk_work);
3941
3942 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3943 restart:
3944 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3945 unsigned long age;
3946
3947 /* When setting preferred_lft to a value not zero or
3948 * infinity, while valid_lft is infinity
3949 * IFA_F_PERMANENT has a non-infinity life time.
3950 */
3951 if ((ifp->flags & IFA_F_PERMANENT) &&
3952 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3953 continue;
3954
3955 spin_lock(&ifp->lock);
3956 /* We try to batch several events at once. */
3957 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3958
3959 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3960 age >= ifp->valid_lft) {
3961 spin_unlock(&ifp->lock);
3962 in6_ifa_hold(ifp);
3963 ipv6_del_addr(ifp);
3964 goto restart;
3965 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3966 spin_unlock(&ifp->lock);
3967 continue;
3968 } else if (age >= ifp->prefered_lft) {
3969 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3970 int deprecate = 0;
3971
3972 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3973 deprecate = 1;
3974 ifp->flags |= IFA_F_DEPRECATED;
3975 }
3976
3977 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3978 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3979 next = ifp->tstamp + ifp->valid_lft * HZ;
3980
3981 spin_unlock(&ifp->lock);
3982
3983 if (deprecate) {
3984 in6_ifa_hold(ifp);
3985
3986 ipv6_ifa_notify(0, ifp);
3987 in6_ifa_put(ifp);
3988 goto restart;
3989 }
3990 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3991 !(ifp->flags&IFA_F_TENTATIVE)) {
3992 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3993 ifp->idev->cnf.dad_transmits *
3994 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3995
3996 if (age >= ifp->prefered_lft - regen_advance) {
3997 struct inet6_ifaddr *ifpub = ifp->ifpub;
3998 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3999 next = ifp->tstamp + ifp->prefered_lft * HZ;
4000 if (!ifp->regen_count && ifpub) {
4001 ifp->regen_count++;
4002 in6_ifa_hold(ifp);
4003 in6_ifa_hold(ifpub);
4004 spin_unlock(&ifp->lock);
4005
4006 spin_lock(&ifpub->lock);
4007 ifpub->regen_count = 0;
4008 spin_unlock(&ifpub->lock);
4009 ipv6_create_tempaddr(ifpub, ifp);
4010 in6_ifa_put(ifpub);
4011 in6_ifa_put(ifp);
4012 goto restart;
4013 }
4014 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4015 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4016 spin_unlock(&ifp->lock);
4017 } else {
4018 /* ifp->prefered_lft <= ifp->valid_lft */
4019 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4020 next = ifp->tstamp + ifp->prefered_lft * HZ;
4021 spin_unlock(&ifp->lock);
4022 }
4023 }
4024 }
4025
4026 next_sec = round_jiffies_up(next);
4027 next_sched = next;
4028
4029 /* If rounded timeout is accurate enough, accept it. */
4030 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4031 next_sched = next_sec;
4032
4033 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4034 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4035 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4036
4037 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4038 now, next, next_sec, next_sched);
4039 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4040 rcu_read_unlock_bh();
4041 }
4042
4043 static void addrconf_verify_work(struct work_struct *w)
4044 {
4045 rtnl_lock();
4046 addrconf_verify_rtnl();
4047 rtnl_unlock();
4048 }
4049
4050 static void addrconf_verify(void)
4051 {
4052 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4053 }
4054
4055 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4056 struct in6_addr **peer_pfx)
4057 {
4058 struct in6_addr *pfx = NULL;
4059
4060 *peer_pfx = NULL;
4061
4062 if (addr)
4063 pfx = nla_data(addr);
4064
4065 if (local) {
4066 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4067 *peer_pfx = pfx;
4068 pfx = nla_data(local);
4069 }
4070
4071 return pfx;
4072 }
4073
4074 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4075 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4076 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4077 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4078 [IFA_FLAGS] = { .len = sizeof(u32) },
4079 };
4080
4081 static int
4082 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4083 {
4084 struct net *net = sock_net(skb->sk);
4085 struct ifaddrmsg *ifm;
4086 struct nlattr *tb[IFA_MAX+1];
4087 struct in6_addr *pfx, *peer_pfx;
4088 u32 ifa_flags;
4089 int err;
4090
4091 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4092 if (err < 0)
4093 return err;
4094
4095 ifm = nlmsg_data(nlh);
4096 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4097 if (!pfx)
4098 return -EINVAL;
4099
4100 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4101
4102 /* We ignore other flags so far. */
4103 ifa_flags &= IFA_F_MANAGETEMPADDR;
4104
4105 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4106 ifm->ifa_prefixlen);
4107 }
4108
4109 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4110 u32 prefered_lft, u32 valid_lft)
4111 {
4112 u32 flags;
4113 clock_t expires;
4114 unsigned long timeout;
4115 bool was_managetempaddr;
4116 bool had_prefixroute;
4117
4118 ASSERT_RTNL();
4119
4120 if (!valid_lft || (prefered_lft > valid_lft))
4121 return -EINVAL;
4122
4123 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4124 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4125 return -EINVAL;
4126
4127 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4128 if (addrconf_finite_timeout(timeout)) {
4129 expires = jiffies_to_clock_t(timeout * HZ);
4130 valid_lft = timeout;
4131 flags = RTF_EXPIRES;
4132 } else {
4133 expires = 0;
4134 flags = 0;
4135 ifa_flags |= IFA_F_PERMANENT;
4136 }
4137
4138 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4139 if (addrconf_finite_timeout(timeout)) {
4140 if (timeout == 0)
4141 ifa_flags |= IFA_F_DEPRECATED;
4142 prefered_lft = timeout;
4143 }
4144
4145 spin_lock_bh(&ifp->lock);
4146 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4147 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4148 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4149 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4150 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4151 IFA_F_NOPREFIXROUTE);
4152 ifp->flags |= ifa_flags;
4153 ifp->tstamp = jiffies;
4154 ifp->valid_lft = valid_lft;
4155 ifp->prefered_lft = prefered_lft;
4156
4157 spin_unlock_bh(&ifp->lock);
4158 if (!(ifp->flags&IFA_F_TENTATIVE))
4159 ipv6_ifa_notify(0, ifp);
4160
4161 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4162 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4163 expires, flags);
4164 } else if (had_prefixroute) {
4165 enum cleanup_prefix_rt_t action;
4166 unsigned long rt_expires;
4167
4168 write_lock_bh(&ifp->idev->lock);
4169 action = check_cleanup_prefix_route(ifp, &rt_expires);
4170 write_unlock_bh(&ifp->idev->lock);
4171
4172 if (action != CLEANUP_PREFIX_RT_NOP) {
4173 cleanup_prefix_route(ifp, rt_expires,
4174 action == CLEANUP_PREFIX_RT_DEL);
4175 }
4176 }
4177
4178 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4179 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4180 valid_lft = prefered_lft = 0;
4181 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4182 !was_managetempaddr, jiffies);
4183 }
4184
4185 addrconf_verify_rtnl();
4186
4187 return 0;
4188 }
4189
4190 static int
4191 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4192 {
4193 struct net *net = sock_net(skb->sk);
4194 struct ifaddrmsg *ifm;
4195 struct nlattr *tb[IFA_MAX+1];
4196 struct in6_addr *pfx, *peer_pfx;
4197 struct inet6_ifaddr *ifa;
4198 struct net_device *dev;
4199 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4200 u32 ifa_flags;
4201 int err;
4202
4203 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4204 if (err < 0)
4205 return err;
4206
4207 ifm = nlmsg_data(nlh);
4208 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4209 if (!pfx)
4210 return -EINVAL;
4211
4212 if (tb[IFA_CACHEINFO]) {
4213 struct ifa_cacheinfo *ci;
4214
4215 ci = nla_data(tb[IFA_CACHEINFO]);
4216 valid_lft = ci->ifa_valid;
4217 preferred_lft = ci->ifa_prefered;
4218 } else {
4219 preferred_lft = INFINITY_LIFE_TIME;
4220 valid_lft = INFINITY_LIFE_TIME;
4221 }
4222
4223 dev = __dev_get_by_index(net, ifm->ifa_index);
4224 if (!dev)
4225 return -ENODEV;
4226
4227 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4228
4229 /* We ignore other flags so far. */
4230 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4231 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4232
4233 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4234 if (!ifa) {
4235 /*
4236 * It would be best to check for !NLM_F_CREATE here but
4237 * userspace already relies on not having to provide this.
4238 */
4239 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4240 ifm->ifa_prefixlen, ifa_flags,
4241 preferred_lft, valid_lft);
4242 }
4243
4244 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4245 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4246 err = -EEXIST;
4247 else
4248 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4249
4250 in6_ifa_put(ifa);
4251
4252 return err;
4253 }
4254
4255 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4256 u8 scope, int ifindex)
4257 {
4258 struct ifaddrmsg *ifm;
4259
4260 ifm = nlmsg_data(nlh);
4261 ifm->ifa_family = AF_INET6;
4262 ifm->ifa_prefixlen = prefixlen;
4263 ifm->ifa_flags = flags;
4264 ifm->ifa_scope = scope;
4265 ifm->ifa_index = ifindex;
4266 }
4267
4268 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4269 unsigned long tstamp, u32 preferred, u32 valid)
4270 {
4271 struct ifa_cacheinfo ci;
4272
4273 ci.cstamp = cstamp_delta(cstamp);
4274 ci.tstamp = cstamp_delta(tstamp);
4275 ci.ifa_prefered = preferred;
4276 ci.ifa_valid = valid;
4277
4278 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4279 }
4280
4281 static inline int rt_scope(int ifa_scope)
4282 {
4283 if (ifa_scope & IFA_HOST)
4284 return RT_SCOPE_HOST;
4285 else if (ifa_scope & IFA_LINK)
4286 return RT_SCOPE_LINK;
4287 else if (ifa_scope & IFA_SITE)
4288 return RT_SCOPE_SITE;
4289 else
4290 return RT_SCOPE_UNIVERSE;
4291 }
4292
4293 static inline int inet6_ifaddr_msgsize(void)
4294 {
4295 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4296 + nla_total_size(16) /* IFA_LOCAL */
4297 + nla_total_size(16) /* IFA_ADDRESS */
4298 + nla_total_size(sizeof(struct ifa_cacheinfo))
4299 + nla_total_size(4) /* IFA_FLAGS */;
4300 }
4301
4302 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4303 u32 portid, u32 seq, int event, unsigned int flags)
4304 {
4305 struct nlmsghdr *nlh;
4306 u32 preferred, valid;
4307
4308 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4309 if (!nlh)
4310 return -EMSGSIZE;
4311
4312 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4313 ifa->idev->dev->ifindex);
4314
4315 if (!((ifa->flags&IFA_F_PERMANENT) &&
4316 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4317 preferred = ifa->prefered_lft;
4318 valid = ifa->valid_lft;
4319 if (preferred != INFINITY_LIFE_TIME) {
4320 long tval = (jiffies - ifa->tstamp)/HZ;
4321 if (preferred > tval)
4322 preferred -= tval;
4323 else
4324 preferred = 0;
4325 if (valid != INFINITY_LIFE_TIME) {
4326 if (valid > tval)
4327 valid -= tval;
4328 else
4329 valid = 0;
4330 }
4331 }
4332 } else {
4333 preferred = INFINITY_LIFE_TIME;
4334 valid = INFINITY_LIFE_TIME;
4335 }
4336
4337 if (!ipv6_addr_any(&ifa->peer_addr)) {
4338 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4339 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4340 goto error;
4341 } else
4342 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4343 goto error;
4344
4345 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4346 goto error;
4347
4348 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4349 goto error;
4350
4351 nlmsg_end(skb, nlh);
4352 return 0;
4353
4354 error:
4355 nlmsg_cancel(skb, nlh);
4356 return -EMSGSIZE;
4357 }
4358
4359 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4360 u32 portid, u32 seq, int event, u16 flags)
4361 {
4362 struct nlmsghdr *nlh;
4363 u8 scope = RT_SCOPE_UNIVERSE;
4364 int ifindex = ifmca->idev->dev->ifindex;
4365
4366 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4367 scope = RT_SCOPE_SITE;
4368
4369 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4370 if (!nlh)
4371 return -EMSGSIZE;
4372
4373 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4374 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4375 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4376 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4377 nlmsg_cancel(skb, nlh);
4378 return -EMSGSIZE;
4379 }
4380
4381 nlmsg_end(skb, nlh);
4382 return 0;
4383 }
4384
4385 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4386 u32 portid, u32 seq, int event, unsigned int flags)
4387 {
4388 struct nlmsghdr *nlh;
4389 u8 scope = RT_SCOPE_UNIVERSE;
4390 int ifindex = ifaca->aca_idev->dev->ifindex;
4391
4392 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4393 scope = RT_SCOPE_SITE;
4394
4395 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4396 if (!nlh)
4397 return -EMSGSIZE;
4398
4399 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4400 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4401 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4402 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4403 nlmsg_cancel(skb, nlh);
4404 return -EMSGSIZE;
4405 }
4406
4407 nlmsg_end(skb, nlh);
4408 return 0;
4409 }
4410
4411 enum addr_type_t {
4412 UNICAST_ADDR,
4413 MULTICAST_ADDR,
4414 ANYCAST_ADDR,
4415 };
4416
4417 /* called with rcu_read_lock() */
4418 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4419 struct netlink_callback *cb, enum addr_type_t type,
4420 int s_ip_idx, int *p_ip_idx)
4421 {
4422 struct ifmcaddr6 *ifmca;
4423 struct ifacaddr6 *ifaca;
4424 int err = 1;
4425 int ip_idx = *p_ip_idx;
4426
4427 read_lock_bh(&idev->lock);
4428 switch (type) {
4429 case UNICAST_ADDR: {
4430 struct inet6_ifaddr *ifa;
4431
4432 /* unicast address incl. temp addr */
4433 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4434 if (++ip_idx < s_ip_idx)
4435 continue;
4436 err = inet6_fill_ifaddr(skb, ifa,
4437 NETLINK_CB(cb->skb).portid,
4438 cb->nlh->nlmsg_seq,
4439 RTM_NEWADDR,
4440 NLM_F_MULTI);
4441 if (err < 0)
4442 break;
4443 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4444 }
4445 break;
4446 }
4447 case MULTICAST_ADDR:
4448 /* multicast address */
4449 for (ifmca = idev->mc_list; ifmca;
4450 ifmca = ifmca->next, ip_idx++) {
4451 if (ip_idx < s_ip_idx)
4452 continue;
4453 err = inet6_fill_ifmcaddr(skb, ifmca,
4454 NETLINK_CB(cb->skb).portid,
4455 cb->nlh->nlmsg_seq,
4456 RTM_GETMULTICAST,
4457 NLM_F_MULTI);
4458 if (err < 0)
4459 break;
4460 }
4461 break;
4462 case ANYCAST_ADDR:
4463 /* anycast address */
4464 for (ifaca = idev->ac_list; ifaca;
4465 ifaca = ifaca->aca_next, ip_idx++) {
4466 if (ip_idx < s_ip_idx)
4467 continue;
4468 err = inet6_fill_ifacaddr(skb, ifaca,
4469 NETLINK_CB(cb->skb).portid,
4470 cb->nlh->nlmsg_seq,
4471 RTM_GETANYCAST,
4472 NLM_F_MULTI);
4473 if (err < 0)
4474 break;
4475 }
4476 break;
4477 default:
4478 break;
4479 }
4480 read_unlock_bh(&idev->lock);
4481 *p_ip_idx = ip_idx;
4482 return err;
4483 }
4484
4485 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4486 enum addr_type_t type)
4487 {
4488 struct net *net = sock_net(skb->sk);
4489 int h, s_h;
4490 int idx, ip_idx;
4491 int s_idx, s_ip_idx;
4492 struct net_device *dev;
4493 struct inet6_dev *idev;
4494 struct hlist_head *head;
4495
4496 s_h = cb->args[0];
4497 s_idx = idx = cb->args[1];
4498 s_ip_idx = ip_idx = cb->args[2];
4499
4500 rcu_read_lock();
4501 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4502 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4503 idx = 0;
4504 head = &net->dev_index_head[h];
4505 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4506 if (idx < s_idx)
4507 goto cont;
4508 if (h > s_h || idx > s_idx)
4509 s_ip_idx = 0;
4510 ip_idx = 0;
4511 idev = __in6_dev_get(dev);
4512 if (!idev)
4513 goto cont;
4514
4515 if (in6_dump_addrs(idev, skb, cb, type,
4516 s_ip_idx, &ip_idx) < 0)
4517 goto done;
4518 cont:
4519 idx++;
4520 }
4521 }
4522 done:
4523 rcu_read_unlock();
4524 cb->args[0] = h;
4525 cb->args[1] = idx;
4526 cb->args[2] = ip_idx;
4527
4528 return skb->len;
4529 }
4530
4531 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4532 {
4533 enum addr_type_t type = UNICAST_ADDR;
4534
4535 return inet6_dump_addr(skb, cb, type);
4536 }
4537
4538 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4539 {
4540 enum addr_type_t type = MULTICAST_ADDR;
4541
4542 return inet6_dump_addr(skb, cb, type);
4543 }
4544
4545
4546 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4547 {
4548 enum addr_type_t type = ANYCAST_ADDR;
4549
4550 return inet6_dump_addr(skb, cb, type);
4551 }
4552
4553 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4554 {
4555 struct net *net = sock_net(in_skb->sk);
4556 struct ifaddrmsg *ifm;
4557 struct nlattr *tb[IFA_MAX+1];
4558 struct in6_addr *addr = NULL, *peer;
4559 struct net_device *dev = NULL;
4560 struct inet6_ifaddr *ifa;
4561 struct sk_buff *skb;
4562 int err;
4563
4564 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4565 if (err < 0)
4566 goto errout;
4567
4568 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4569 if (!addr) {
4570 err = -EINVAL;
4571 goto errout;
4572 }
4573
4574 ifm = nlmsg_data(nlh);
4575 if (ifm->ifa_index)
4576 dev = __dev_get_by_index(net, ifm->ifa_index);
4577
4578 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4579 if (!ifa) {
4580 err = -EADDRNOTAVAIL;
4581 goto errout;
4582 }
4583
4584 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4585 if (!skb) {
4586 err = -ENOBUFS;
4587 goto errout_ifa;
4588 }
4589
4590 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4591 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4592 if (err < 0) {
4593 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4594 WARN_ON(err == -EMSGSIZE);
4595 kfree_skb(skb);
4596 goto errout_ifa;
4597 }
4598 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4599 errout_ifa:
4600 in6_ifa_put(ifa);
4601 errout:
4602 return err;
4603 }
4604
4605 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4606 {
4607 struct sk_buff *skb;
4608 struct net *net = dev_net(ifa->idev->dev);
4609 int err = -ENOBUFS;
4610
4611 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4612 if (!skb)
4613 goto errout;
4614
4615 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4616 if (err < 0) {
4617 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4618 WARN_ON(err == -EMSGSIZE);
4619 kfree_skb(skb);
4620 goto errout;
4621 }
4622 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4623 return;
4624 errout:
4625 if (err < 0)
4626 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4627 }
4628
4629 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4630 __s32 *array, int bytes)
4631 {
4632 BUG_ON(bytes < (DEVCONF_MAX * 4));
4633
4634 memset(array, 0, bytes);
4635 array[DEVCONF_FORWARDING] = cnf->forwarding;
4636 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4637 array[DEVCONF_MTU6] = cnf->mtu6;
4638 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4639 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4640 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4641 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4642 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4643 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4644 jiffies_to_msecs(cnf->rtr_solicit_interval);
4645 array[DEVCONF_RTR_SOLICIT_DELAY] =
4646 jiffies_to_msecs(cnf->rtr_solicit_delay);
4647 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4648 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4649 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4650 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4651 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4652 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4653 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4654 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4655 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4656 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4657 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4658 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4659 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4660 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4661 #ifdef CONFIG_IPV6_ROUTER_PREF
4662 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4663 array[DEVCONF_RTR_PROBE_INTERVAL] =
4664 jiffies_to_msecs(cnf->rtr_probe_interval);
4665 #ifdef CONFIG_IPV6_ROUTE_INFO
4666 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4667 #endif
4668 #endif
4669 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4670 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4671 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4672 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4673 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4674 #endif
4675 #ifdef CONFIG_IPV6_MROUTE
4676 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4677 #endif
4678 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4679 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4680 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4681 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4682 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4683 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4684 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4685 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4686 /* we omit DEVCONF_STABLE_SECRET for now */
4687 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4688 }
4689
4690 static inline size_t inet6_ifla6_size(void)
4691 {
4692 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4693 + nla_total_size(sizeof(struct ifla_cacheinfo))
4694 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4695 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4696 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4697 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4698 }
4699
4700 static inline size_t inet6_if_nlmsg_size(void)
4701 {
4702 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4703 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4704 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4705 + nla_total_size(4) /* IFLA_MTU */
4706 + nla_total_size(4) /* IFLA_LINK */
4707 + nla_total_size(1) /* IFLA_OPERSTATE */
4708 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4709 }
4710
4711 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4712 int items, int bytes)
4713 {
4714 int i;
4715 int pad = bytes - sizeof(u64) * items;
4716 BUG_ON(pad < 0);
4717
4718 /* Use put_unaligned() because stats may not be aligned for u64. */
4719 put_unaligned(items, &stats[0]);
4720 for (i = 1; i < items; i++)
4721 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4722
4723 memset(&stats[items], 0, pad);
4724 }
4725
4726 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4727 int bytes, size_t syncpoff)
4728 {
4729 int i, c;
4730 u64 buff[IPSTATS_MIB_MAX];
4731 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4732
4733 BUG_ON(pad < 0);
4734
4735 memset(buff, 0, sizeof(buff));
4736 buff[0] = IPSTATS_MIB_MAX;
4737
4738 for_each_possible_cpu(c) {
4739 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4740 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4741 }
4742
4743 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4744 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4745 }
4746
4747 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4748 int bytes)
4749 {
4750 switch (attrtype) {
4751 case IFLA_INET6_STATS:
4752 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4753 offsetof(struct ipstats_mib, syncp));
4754 break;
4755 case IFLA_INET6_ICMP6STATS:
4756 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4757 break;
4758 }
4759 }
4760
4761 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4762 u32 ext_filter_mask)
4763 {
4764 struct nlattr *nla;
4765 struct ifla_cacheinfo ci;
4766
4767 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4768 goto nla_put_failure;
4769 ci.max_reasm_len = IPV6_MAXPLEN;
4770 ci.tstamp = cstamp_delta(idev->tstamp);
4771 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4772 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4773 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4774 goto nla_put_failure;
4775 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4776 if (!nla)
4777 goto nla_put_failure;
4778 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4779
4780 /* XXX - MC not implemented */
4781
4782 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4783 return 0;
4784
4785 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4786 if (!nla)
4787 goto nla_put_failure;
4788 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4789
4790 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4791 if (!nla)
4792 goto nla_put_failure;
4793 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4794
4795 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4796 if (!nla)
4797 goto nla_put_failure;
4798
4799 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4800 goto nla_put_failure;
4801
4802 read_lock_bh(&idev->lock);
4803 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4804 read_unlock_bh(&idev->lock);
4805
4806 return 0;
4807
4808 nla_put_failure:
4809 return -EMSGSIZE;
4810 }
4811
4812 static size_t inet6_get_link_af_size(const struct net_device *dev,
4813 u32 ext_filter_mask)
4814 {
4815 if (!__in6_dev_get(dev))
4816 return 0;
4817
4818 return inet6_ifla6_size();
4819 }
4820
4821 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4822 u32 ext_filter_mask)
4823 {
4824 struct inet6_dev *idev = __in6_dev_get(dev);
4825
4826 if (!idev)
4827 return -ENODATA;
4828
4829 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4830 return -EMSGSIZE;
4831
4832 return 0;
4833 }
4834
4835 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4836 {
4837 struct inet6_ifaddr *ifp;
4838 struct net_device *dev = idev->dev;
4839 bool update_rs = false;
4840 struct in6_addr ll_addr;
4841
4842 ASSERT_RTNL();
4843
4844 if (!token)
4845 return -EINVAL;
4846 if (ipv6_addr_any(token))
4847 return -EINVAL;
4848 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4849 return -EINVAL;
4850 if (!ipv6_accept_ra(idev))
4851 return -EINVAL;
4852 if (idev->cnf.rtr_solicits <= 0)
4853 return -EINVAL;
4854
4855 write_lock_bh(&idev->lock);
4856
4857 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4858 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4859
4860 write_unlock_bh(&idev->lock);
4861
4862 if (!idev->dead && (idev->if_flags & IF_READY) &&
4863 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4864 IFA_F_OPTIMISTIC)) {
4865
4866 /* If we're not ready, then normal ifup will take care
4867 * of this. Otherwise, we need to request our rs here.
4868 */
4869 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4870 update_rs = true;
4871 }
4872
4873 write_lock_bh(&idev->lock);
4874
4875 if (update_rs) {
4876 idev->if_flags |= IF_RS_SENT;
4877 idev->rs_probes = 1;
4878 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4879 }
4880
4881 /* Well, that's kinda nasty ... */
4882 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4883 spin_lock(&ifp->lock);
4884 if (ifp->tokenized) {
4885 ifp->valid_lft = 0;
4886 ifp->prefered_lft = 0;
4887 }
4888 spin_unlock(&ifp->lock);
4889 }
4890
4891 write_unlock_bh(&idev->lock);
4892 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4893 addrconf_verify_rtnl();
4894 return 0;
4895 }
4896
4897 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4898 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4899 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4900 };
4901
4902 static int inet6_validate_link_af(const struct net_device *dev,
4903 const struct nlattr *nla)
4904 {
4905 struct nlattr *tb[IFLA_INET6_MAX + 1];
4906
4907 if (dev && !__in6_dev_get(dev))
4908 return -EAFNOSUPPORT;
4909
4910 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4911 }
4912
4913 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4914 {
4915 int err = -EINVAL;
4916 struct inet6_dev *idev = __in6_dev_get(dev);
4917 struct nlattr *tb[IFLA_INET6_MAX + 1];
4918
4919 if (!idev)
4920 return -EAFNOSUPPORT;
4921
4922 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4923 BUG();
4924
4925 if (tb[IFLA_INET6_TOKEN]) {
4926 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4927 if (err)
4928 return err;
4929 }
4930
4931 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4932 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4933
4934 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4935 mode != IN6_ADDR_GEN_MODE_NONE &&
4936 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4937 return -EINVAL;
4938
4939 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4940 !idev->cnf.stable_secret.initialized &&
4941 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4942 return -EINVAL;
4943
4944 idev->addr_gen_mode = mode;
4945 err = 0;
4946 }
4947
4948 return err;
4949 }
4950
4951 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4952 u32 portid, u32 seq, int event, unsigned int flags)
4953 {
4954 struct net_device *dev = idev->dev;
4955 struct ifinfomsg *hdr;
4956 struct nlmsghdr *nlh;
4957 void *protoinfo;
4958
4959 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4960 if (!nlh)
4961 return -EMSGSIZE;
4962
4963 hdr = nlmsg_data(nlh);
4964 hdr->ifi_family = AF_INET6;
4965 hdr->__ifi_pad = 0;
4966 hdr->ifi_type = dev->type;
4967 hdr->ifi_index = dev->ifindex;
4968 hdr->ifi_flags = dev_get_flags(dev);
4969 hdr->ifi_change = 0;
4970
4971 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4972 (dev->addr_len &&
4973 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4974 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4975 (dev->ifindex != dev_get_iflink(dev) &&
4976 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
4977 nla_put_u8(skb, IFLA_OPERSTATE,
4978 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
4979 goto nla_put_failure;
4980 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4981 if (!protoinfo)
4982 goto nla_put_failure;
4983
4984 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
4985 goto nla_put_failure;
4986
4987 nla_nest_end(skb, protoinfo);
4988 nlmsg_end(skb, nlh);
4989 return 0;
4990
4991 nla_put_failure:
4992 nlmsg_cancel(skb, nlh);
4993 return -EMSGSIZE;
4994 }
4995
4996 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4997 {
4998 struct net *net = sock_net(skb->sk);
4999 int h, s_h;
5000 int idx = 0, s_idx;
5001 struct net_device *dev;
5002 struct inet6_dev *idev;
5003 struct hlist_head *head;
5004
5005 s_h = cb->args[0];
5006 s_idx = cb->args[1];
5007
5008 rcu_read_lock();
5009 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5010 idx = 0;
5011 head = &net->dev_index_head[h];
5012 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5013 if (idx < s_idx)
5014 goto cont;
5015 idev = __in6_dev_get(dev);
5016 if (!idev)
5017 goto cont;
5018 if (inet6_fill_ifinfo(skb, idev,
5019 NETLINK_CB(cb->skb).portid,
5020 cb->nlh->nlmsg_seq,
5021 RTM_NEWLINK, NLM_F_MULTI) < 0)
5022 goto out;
5023 cont:
5024 idx++;
5025 }
5026 }
5027 out:
5028 rcu_read_unlock();
5029 cb->args[1] = idx;
5030 cb->args[0] = h;
5031
5032 return skb->len;
5033 }
5034
5035 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5036 {
5037 struct sk_buff *skb;
5038 struct net *net = dev_net(idev->dev);
5039 int err = -ENOBUFS;
5040
5041 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5042 if (!skb)
5043 goto errout;
5044
5045 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5046 if (err < 0) {
5047 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5048 WARN_ON(err == -EMSGSIZE);
5049 kfree_skb(skb);
5050 goto errout;
5051 }
5052 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5053 return;
5054 errout:
5055 if (err < 0)
5056 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5057 }
5058
5059 static inline size_t inet6_prefix_nlmsg_size(void)
5060 {
5061 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5062 + nla_total_size(sizeof(struct in6_addr))
5063 + nla_total_size(sizeof(struct prefix_cacheinfo));
5064 }
5065
5066 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5067 struct prefix_info *pinfo, u32 portid, u32 seq,
5068 int event, unsigned int flags)
5069 {
5070 struct prefixmsg *pmsg;
5071 struct nlmsghdr *nlh;
5072 struct prefix_cacheinfo ci;
5073
5074 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5075 if (!nlh)
5076 return -EMSGSIZE;
5077
5078 pmsg = nlmsg_data(nlh);
5079 pmsg->prefix_family = AF_INET6;
5080 pmsg->prefix_pad1 = 0;
5081 pmsg->prefix_pad2 = 0;
5082 pmsg->prefix_ifindex = idev->dev->ifindex;
5083 pmsg->prefix_len = pinfo->prefix_len;
5084 pmsg->prefix_type = pinfo->type;
5085 pmsg->prefix_pad3 = 0;
5086 pmsg->prefix_flags = 0;
5087 if (pinfo->onlink)
5088 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5089 if (pinfo->autoconf)
5090 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5091
5092 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5093 goto nla_put_failure;
5094 ci.preferred_time = ntohl(pinfo->prefered);
5095 ci.valid_time = ntohl(pinfo->valid);
5096 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5097 goto nla_put_failure;
5098 nlmsg_end(skb, nlh);
5099 return 0;
5100
5101 nla_put_failure:
5102 nlmsg_cancel(skb, nlh);
5103 return -EMSGSIZE;
5104 }
5105
5106 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5107 struct prefix_info *pinfo)
5108 {
5109 struct sk_buff *skb;
5110 struct net *net = dev_net(idev->dev);
5111 int err = -ENOBUFS;
5112
5113 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5114 if (!skb)
5115 goto errout;
5116
5117 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5118 if (err < 0) {
5119 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5120 WARN_ON(err == -EMSGSIZE);
5121 kfree_skb(skb);
5122 goto errout;
5123 }
5124 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5125 return;
5126 errout:
5127 if (err < 0)
5128 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5129 }
5130
5131 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5132 {
5133 struct net *net = dev_net(ifp->idev->dev);
5134
5135 if (event)
5136 ASSERT_RTNL();
5137
5138 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5139
5140 switch (event) {
5141 case RTM_NEWADDR:
5142 /*
5143 * If the address was optimistic
5144 * we inserted the route at the start of
5145 * our DAD process, so we don't need
5146 * to do it again
5147 */
5148 if (!(ifp->rt->rt6i_node))
5149 ip6_ins_rt(ifp->rt);
5150 if (ifp->idev->cnf.forwarding)
5151 addrconf_join_anycast(ifp);
5152 if (!ipv6_addr_any(&ifp->peer_addr))
5153 addrconf_prefix_route(&ifp->peer_addr, 128,
5154 ifp->idev->dev, 0, 0);
5155 break;
5156 case RTM_DELADDR:
5157 if (ifp->idev->cnf.forwarding)
5158 addrconf_leave_anycast(ifp);
5159 addrconf_leave_solict(ifp->idev, &ifp->addr);
5160 if (!ipv6_addr_any(&ifp->peer_addr)) {
5161 struct rt6_info *rt;
5162
5163 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5164 ifp->idev->dev, 0, 0);
5165 if (rt)
5166 ip6_del_rt(rt);
5167 }
5168 dst_hold(&ifp->rt->dst);
5169
5170 ip6_del_rt(ifp->rt);
5171
5172 rt_genid_bump_ipv6(net);
5173 break;
5174 }
5175 atomic_inc(&net->ipv6.dev_addr_genid);
5176 }
5177
5178 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5179 {
5180 rcu_read_lock_bh();
5181 if (likely(ifp->idev->dead == 0))
5182 __ipv6_ifa_notify(event, ifp);
5183 rcu_read_unlock_bh();
5184 }
5185
5186 #ifdef CONFIG_SYSCTL
5187
5188 static
5189 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5190 void __user *buffer, size_t *lenp, loff_t *ppos)
5191 {
5192 int *valp = ctl->data;
5193 int val = *valp;
5194 loff_t pos = *ppos;
5195 struct ctl_table lctl;
5196 int ret;
5197
5198 /*
5199 * ctl->data points to idev->cnf.forwarding, we should
5200 * not modify it until we get the rtnl lock.
5201 */
5202 lctl = *ctl;
5203 lctl.data = &val;
5204
5205 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5206
5207 if (write)
5208 ret = addrconf_fixup_forwarding(ctl, valp, val);
5209 if (ret)
5210 *ppos = pos;
5211 return ret;
5212 }
5213
5214 static
5215 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5216 void __user *buffer, size_t *lenp, loff_t *ppos)
5217 {
5218 struct inet6_dev *idev = ctl->extra1;
5219 int min_mtu = IPV6_MIN_MTU;
5220 struct ctl_table lctl;
5221
5222 lctl = *ctl;
5223 lctl.extra1 = &min_mtu;
5224 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5225
5226 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5227 }
5228
5229 static void dev_disable_change(struct inet6_dev *idev)
5230 {
5231 struct netdev_notifier_info info;
5232
5233 if (!idev || !idev->dev)
5234 return;
5235
5236 netdev_notifier_info_init(&info, idev->dev);
5237 if (idev->cnf.disable_ipv6)
5238 addrconf_notify(NULL, NETDEV_DOWN, &info);
5239 else
5240 addrconf_notify(NULL, NETDEV_UP, &info);
5241 }
5242
5243 static void addrconf_disable_change(struct net *net, __s32 newf)
5244 {
5245 struct net_device *dev;
5246 struct inet6_dev *idev;
5247
5248 for_each_netdev(net, dev) {
5249 idev = __in6_dev_get(dev);
5250 if (idev) {
5251 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5252 idev->cnf.disable_ipv6 = newf;
5253 if (changed)
5254 dev_disable_change(idev);
5255 }
5256 }
5257 }
5258
5259 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5260 {
5261 struct net *net;
5262 int old;
5263
5264 if (!rtnl_trylock())
5265 return restart_syscall();
5266
5267 net = (struct net *)table->extra2;
5268 old = *p;
5269 *p = newf;
5270
5271 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5272 rtnl_unlock();
5273 return 0;
5274 }
5275
5276 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5277 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5278 addrconf_disable_change(net, newf);
5279 } else if ((!newf) ^ (!old))
5280 dev_disable_change((struct inet6_dev *)table->extra1);
5281
5282 rtnl_unlock();
5283 return 0;
5284 }
5285
5286 static
5287 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5288 void __user *buffer, size_t *lenp, loff_t *ppos)
5289 {
5290 int *valp = ctl->data;
5291 int val = *valp;
5292 loff_t pos = *ppos;
5293 struct ctl_table lctl;
5294 int ret;
5295
5296 /*
5297 * ctl->data points to idev->cnf.disable_ipv6, we should
5298 * not modify it until we get the rtnl lock.
5299 */
5300 lctl = *ctl;
5301 lctl.data = &val;
5302
5303 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5304
5305 if (write)
5306 ret = addrconf_disable_ipv6(ctl, valp, val);
5307 if (ret)
5308 *ppos = pos;
5309 return ret;
5310 }
5311
5312 static
5313 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5314 void __user *buffer, size_t *lenp, loff_t *ppos)
5315 {
5316 int *valp = ctl->data;
5317 int ret;
5318 int old, new;
5319
5320 old = *valp;
5321 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5322 new = *valp;
5323
5324 if (write && old != new) {
5325 struct net *net = ctl->extra2;
5326
5327 if (!rtnl_trylock())
5328 return restart_syscall();
5329
5330 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5331 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5332 NETCONFA_IFINDEX_DEFAULT,
5333 net->ipv6.devconf_dflt);
5334 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5335 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5336 NETCONFA_IFINDEX_ALL,
5337 net->ipv6.devconf_all);
5338 else {
5339 struct inet6_dev *idev = ctl->extra1;
5340
5341 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5342 idev->dev->ifindex,
5343 &idev->cnf);
5344 }
5345 rtnl_unlock();
5346 }
5347
5348 return ret;
5349 }
5350
5351 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5352 void __user *buffer, size_t *lenp,
5353 loff_t *ppos)
5354 {
5355 int err;
5356 struct in6_addr addr;
5357 char str[IPV6_MAX_STRLEN];
5358 struct ctl_table lctl = *ctl;
5359 struct net *net = ctl->extra2;
5360 struct ipv6_stable_secret *secret = ctl->data;
5361
5362 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5363 return -EIO;
5364
5365 lctl.maxlen = IPV6_MAX_STRLEN;
5366 lctl.data = str;
5367
5368 if (!rtnl_trylock())
5369 return restart_syscall();
5370
5371 if (!write && !secret->initialized) {
5372 err = -EIO;
5373 goto out;
5374 }
5375
5376 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5377 if (err >= sizeof(str)) {
5378 err = -EIO;
5379 goto out;
5380 }
5381
5382 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5383 if (err || !write)
5384 goto out;
5385
5386 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5387 err = -EIO;
5388 goto out;
5389 }
5390
5391 secret->initialized = true;
5392 secret->secret = addr;
5393
5394 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5395 struct net_device *dev;
5396
5397 for_each_netdev(net, dev) {
5398 struct inet6_dev *idev = __in6_dev_get(dev);
5399
5400 if (idev) {
5401 idev->addr_gen_mode =
5402 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5403 }
5404 }
5405 } else {
5406 struct inet6_dev *idev = ctl->extra1;
5407
5408 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5409 }
5410
5411 out:
5412 rtnl_unlock();
5413
5414 return err;
5415 }
5416
5417 static
5418 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5419 int write,
5420 void __user *buffer,
5421 size_t *lenp,
5422 loff_t *ppos)
5423 {
5424 int *valp = ctl->data;
5425 int val = *valp;
5426 loff_t pos = *ppos;
5427 struct ctl_table lctl;
5428 int ret;
5429
5430 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5431 * we should not modify it until we get the rtnl lock.
5432 */
5433 lctl = *ctl;
5434 lctl.data = &val;
5435
5436 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5437
5438 if (write)
5439 ret = addrconf_fixup_linkdown(ctl, valp, val);
5440 if (ret)
5441 *ppos = pos;
5442 return ret;
5443 }
5444
5445 static struct addrconf_sysctl_table
5446 {
5447 struct ctl_table_header *sysctl_header;
5448 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5449 } addrconf_sysctl __read_mostly = {
5450 .sysctl_header = NULL,
5451 .addrconf_vars = {
5452 {
5453 .procname = "forwarding",
5454 .data = &ipv6_devconf.forwarding,
5455 .maxlen = sizeof(int),
5456 .mode = 0644,
5457 .proc_handler = addrconf_sysctl_forward,
5458 },
5459 {
5460 .procname = "hop_limit",
5461 .data = &ipv6_devconf.hop_limit,
5462 .maxlen = sizeof(int),
5463 .mode = 0644,
5464 .proc_handler = proc_dointvec,
5465 },
5466 {
5467 .procname = "mtu",
5468 .data = &ipv6_devconf.mtu6,
5469 .maxlen = sizeof(int),
5470 .mode = 0644,
5471 .proc_handler = addrconf_sysctl_mtu,
5472 },
5473 {
5474 .procname = "accept_ra",
5475 .data = &ipv6_devconf.accept_ra,
5476 .maxlen = sizeof(int),
5477 .mode = 0644,
5478 .proc_handler = proc_dointvec,
5479 },
5480 {
5481 .procname = "accept_redirects",
5482 .data = &ipv6_devconf.accept_redirects,
5483 .maxlen = sizeof(int),
5484 .mode = 0644,
5485 .proc_handler = proc_dointvec,
5486 },
5487 {
5488 .procname = "autoconf",
5489 .data = &ipv6_devconf.autoconf,
5490 .maxlen = sizeof(int),
5491 .mode = 0644,
5492 .proc_handler = proc_dointvec,
5493 },
5494 {
5495 .procname = "dad_transmits",
5496 .data = &ipv6_devconf.dad_transmits,
5497 .maxlen = sizeof(int),
5498 .mode = 0644,
5499 .proc_handler = proc_dointvec,
5500 },
5501 {
5502 .procname = "router_solicitations",
5503 .data = &ipv6_devconf.rtr_solicits,
5504 .maxlen = sizeof(int),
5505 .mode = 0644,
5506 .proc_handler = proc_dointvec,
5507 },
5508 {
5509 .procname = "router_solicitation_interval",
5510 .data = &ipv6_devconf.rtr_solicit_interval,
5511 .maxlen = sizeof(int),
5512 .mode = 0644,
5513 .proc_handler = proc_dointvec_jiffies,
5514 },
5515 {
5516 .procname = "router_solicitation_delay",
5517 .data = &ipv6_devconf.rtr_solicit_delay,
5518 .maxlen = sizeof(int),
5519 .mode = 0644,
5520 .proc_handler = proc_dointvec_jiffies,
5521 },
5522 {
5523 .procname = "force_mld_version",
5524 .data = &ipv6_devconf.force_mld_version,
5525 .maxlen = sizeof(int),
5526 .mode = 0644,
5527 .proc_handler = proc_dointvec,
5528 },
5529 {
5530 .procname = "mldv1_unsolicited_report_interval",
5531 .data =
5532 &ipv6_devconf.mldv1_unsolicited_report_interval,
5533 .maxlen = sizeof(int),
5534 .mode = 0644,
5535 .proc_handler = proc_dointvec_ms_jiffies,
5536 },
5537 {
5538 .procname = "mldv2_unsolicited_report_interval",
5539 .data =
5540 &ipv6_devconf.mldv2_unsolicited_report_interval,
5541 .maxlen = sizeof(int),
5542 .mode = 0644,
5543 .proc_handler = proc_dointvec_ms_jiffies,
5544 },
5545 {
5546 .procname = "use_tempaddr",
5547 .data = &ipv6_devconf.use_tempaddr,
5548 .maxlen = sizeof(int),
5549 .mode = 0644,
5550 .proc_handler = proc_dointvec,
5551 },
5552 {
5553 .procname = "temp_valid_lft",
5554 .data = &ipv6_devconf.temp_valid_lft,
5555 .maxlen = sizeof(int),
5556 .mode = 0644,
5557 .proc_handler = proc_dointvec,
5558 },
5559 {
5560 .procname = "temp_prefered_lft",
5561 .data = &ipv6_devconf.temp_prefered_lft,
5562 .maxlen = sizeof(int),
5563 .mode = 0644,
5564 .proc_handler = proc_dointvec,
5565 },
5566 {
5567 .procname = "regen_max_retry",
5568 .data = &ipv6_devconf.regen_max_retry,
5569 .maxlen = sizeof(int),
5570 .mode = 0644,
5571 .proc_handler = proc_dointvec,
5572 },
5573 {
5574 .procname = "max_desync_factor",
5575 .data = &ipv6_devconf.max_desync_factor,
5576 .maxlen = sizeof(int),
5577 .mode = 0644,
5578 .proc_handler = proc_dointvec,
5579 },
5580 {
5581 .procname = "max_addresses",
5582 .data = &ipv6_devconf.max_addresses,
5583 .maxlen = sizeof(int),
5584 .mode = 0644,
5585 .proc_handler = proc_dointvec,
5586 },
5587 {
5588 .procname = "accept_ra_defrtr",
5589 .data = &ipv6_devconf.accept_ra_defrtr,
5590 .maxlen = sizeof(int),
5591 .mode = 0644,
5592 .proc_handler = proc_dointvec,
5593 },
5594 {
5595 .procname = "accept_ra_min_hop_limit",
5596 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5597 .maxlen = sizeof(int),
5598 .mode = 0644,
5599 .proc_handler = proc_dointvec,
5600 },
5601 {
5602 .procname = "accept_ra_pinfo",
5603 .data = &ipv6_devconf.accept_ra_pinfo,
5604 .maxlen = sizeof(int),
5605 .mode = 0644,
5606 .proc_handler = proc_dointvec,
5607 },
5608 #ifdef CONFIG_IPV6_ROUTER_PREF
5609 {
5610 .procname = "accept_ra_rtr_pref",
5611 .data = &ipv6_devconf.accept_ra_rtr_pref,
5612 .maxlen = sizeof(int),
5613 .mode = 0644,
5614 .proc_handler = proc_dointvec,
5615 },
5616 {
5617 .procname = "router_probe_interval",
5618 .data = &ipv6_devconf.rtr_probe_interval,
5619 .maxlen = sizeof(int),
5620 .mode = 0644,
5621 .proc_handler = proc_dointvec_jiffies,
5622 },
5623 #ifdef CONFIG_IPV6_ROUTE_INFO
5624 {
5625 .procname = "accept_ra_rt_info_max_plen",
5626 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5627 .maxlen = sizeof(int),
5628 .mode = 0644,
5629 .proc_handler = proc_dointvec,
5630 },
5631 #endif
5632 #endif
5633 {
5634 .procname = "proxy_ndp",
5635 .data = &ipv6_devconf.proxy_ndp,
5636 .maxlen = sizeof(int),
5637 .mode = 0644,
5638 .proc_handler = addrconf_sysctl_proxy_ndp,
5639 },
5640 {
5641 .procname = "accept_source_route",
5642 .data = &ipv6_devconf.accept_source_route,
5643 .maxlen = sizeof(int),
5644 .mode = 0644,
5645 .proc_handler = proc_dointvec,
5646 },
5647 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5648 {
5649 .procname = "optimistic_dad",
5650 .data = &ipv6_devconf.optimistic_dad,
5651 .maxlen = sizeof(int),
5652 .mode = 0644,
5653 .proc_handler = proc_dointvec,
5654
5655 },
5656 {
5657 .procname = "use_optimistic",
5658 .data = &ipv6_devconf.use_optimistic,
5659 .maxlen = sizeof(int),
5660 .mode = 0644,
5661 .proc_handler = proc_dointvec,
5662
5663 },
5664 #endif
5665 #ifdef CONFIG_IPV6_MROUTE
5666 {
5667 .procname = "mc_forwarding",
5668 .data = &ipv6_devconf.mc_forwarding,
5669 .maxlen = sizeof(int),
5670 .mode = 0444,
5671 .proc_handler = proc_dointvec,
5672 },
5673 #endif
5674 {
5675 .procname = "disable_ipv6",
5676 .data = &ipv6_devconf.disable_ipv6,
5677 .maxlen = sizeof(int),
5678 .mode = 0644,
5679 .proc_handler = addrconf_sysctl_disable,
5680 },
5681 {
5682 .procname = "accept_dad",
5683 .data = &ipv6_devconf.accept_dad,
5684 .maxlen = sizeof(int),
5685 .mode = 0644,
5686 .proc_handler = proc_dointvec,
5687 },
5688 {
5689 .procname = "force_tllao",
5690 .data = &ipv6_devconf.force_tllao,
5691 .maxlen = sizeof(int),
5692 .mode = 0644,
5693 .proc_handler = proc_dointvec
5694 },
5695 {
5696 .procname = "ndisc_notify",
5697 .data = &ipv6_devconf.ndisc_notify,
5698 .maxlen = sizeof(int),
5699 .mode = 0644,
5700 .proc_handler = proc_dointvec
5701 },
5702 {
5703 .procname = "suppress_frag_ndisc",
5704 .data = &ipv6_devconf.suppress_frag_ndisc,
5705 .maxlen = sizeof(int),
5706 .mode = 0644,
5707 .proc_handler = proc_dointvec
5708 },
5709 {
5710 .procname = "accept_ra_from_local",
5711 .data = &ipv6_devconf.accept_ra_from_local,
5712 .maxlen = sizeof(int),
5713 .mode = 0644,
5714 .proc_handler = proc_dointvec,
5715 },
5716 {
5717 .procname = "accept_ra_mtu",
5718 .data = &ipv6_devconf.accept_ra_mtu,
5719 .maxlen = sizeof(int),
5720 .mode = 0644,
5721 .proc_handler = proc_dointvec,
5722 },
5723 {
5724 .procname = "stable_secret",
5725 .data = &ipv6_devconf.stable_secret,
5726 .maxlen = IPV6_MAX_STRLEN,
5727 .mode = 0600,
5728 .proc_handler = addrconf_sysctl_stable_secret,
5729 },
5730 {
5731 .procname = "use_oif_addrs_only",
5732 .data = &ipv6_devconf.use_oif_addrs_only,
5733 .maxlen = sizeof(int),
5734 .mode = 0644,
5735 .proc_handler = proc_dointvec,
5736 },
5737 {
5738 .procname = "ignore_routes_with_linkdown",
5739 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5740 .maxlen = sizeof(int),
5741 .mode = 0644,
5742 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5743 },
5744 {
5745 /* sentinel */
5746 }
5747 },
5748 };
5749
5750 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5751 struct inet6_dev *idev, struct ipv6_devconf *p)
5752 {
5753 int i;
5754 struct addrconf_sysctl_table *t;
5755 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5756
5757 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5758 if (!t)
5759 goto out;
5760
5761 for (i = 0; t->addrconf_vars[i].data; i++) {
5762 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5763 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5764 t->addrconf_vars[i].extra2 = net;
5765 }
5766
5767 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5768
5769 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5770 if (!t->sysctl_header)
5771 goto free;
5772
5773 p->sysctl = t;
5774 return 0;
5775
5776 free:
5777 kfree(t);
5778 out:
5779 return -ENOBUFS;
5780 }
5781
5782 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5783 {
5784 struct addrconf_sysctl_table *t;
5785
5786 if (!p->sysctl)
5787 return;
5788
5789 t = p->sysctl;
5790 p->sysctl = NULL;
5791 unregister_net_sysctl_table(t->sysctl_header);
5792 kfree(t);
5793 }
5794
5795 static int addrconf_sysctl_register(struct inet6_dev *idev)
5796 {
5797 int err;
5798
5799 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5800 return -EINVAL;
5801
5802 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5803 &ndisc_ifinfo_sysctl_change);
5804 if (err)
5805 return err;
5806 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5807 idev, &idev->cnf);
5808 if (err)
5809 neigh_sysctl_unregister(idev->nd_parms);
5810
5811 return err;
5812 }
5813
5814 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5815 {
5816 __addrconf_sysctl_unregister(&idev->cnf);
5817 neigh_sysctl_unregister(idev->nd_parms);
5818 }
5819
5820
5821 #endif
5822
5823 static int __net_init addrconf_init_net(struct net *net)
5824 {
5825 int err = -ENOMEM;
5826 struct ipv6_devconf *all, *dflt;
5827
5828 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5829 if (!all)
5830 goto err_alloc_all;
5831
5832 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5833 if (!dflt)
5834 goto err_alloc_dflt;
5835
5836 /* these will be inherited by all namespaces */
5837 dflt->autoconf = ipv6_defaults.autoconf;
5838 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5839
5840 dflt->stable_secret.initialized = false;
5841 all->stable_secret.initialized = false;
5842
5843 net->ipv6.devconf_all = all;
5844 net->ipv6.devconf_dflt = dflt;
5845
5846 #ifdef CONFIG_SYSCTL
5847 err = __addrconf_sysctl_register(net, "all", NULL, all);
5848 if (err < 0)
5849 goto err_reg_all;
5850
5851 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5852 if (err < 0)
5853 goto err_reg_dflt;
5854 #endif
5855 return 0;
5856
5857 #ifdef CONFIG_SYSCTL
5858 err_reg_dflt:
5859 __addrconf_sysctl_unregister(all);
5860 err_reg_all:
5861 kfree(dflt);
5862 #endif
5863 err_alloc_dflt:
5864 kfree(all);
5865 err_alloc_all:
5866 return err;
5867 }
5868
5869 static void __net_exit addrconf_exit_net(struct net *net)
5870 {
5871 #ifdef CONFIG_SYSCTL
5872 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5873 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5874 #endif
5875 kfree(net->ipv6.devconf_dflt);
5876 kfree(net->ipv6.devconf_all);
5877 }
5878
5879 static struct pernet_operations addrconf_ops = {
5880 .init = addrconf_init_net,
5881 .exit = addrconf_exit_net,
5882 };
5883
5884 static struct rtnl_af_ops inet6_ops __read_mostly = {
5885 .family = AF_INET6,
5886 .fill_link_af = inet6_fill_link_af,
5887 .get_link_af_size = inet6_get_link_af_size,
5888 .validate_link_af = inet6_validate_link_af,
5889 .set_link_af = inet6_set_link_af,
5890 };
5891
5892 /*
5893 * Init / cleanup code
5894 */
5895
5896 int __init addrconf_init(void)
5897 {
5898 struct inet6_dev *idev;
5899 int i, err;
5900
5901 err = ipv6_addr_label_init();
5902 if (err < 0) {
5903 pr_crit("%s: cannot initialize default policy table: %d\n",
5904 __func__, err);
5905 goto out;
5906 }
5907
5908 err = register_pernet_subsys(&addrconf_ops);
5909 if (err < 0)
5910 goto out_addrlabel;
5911
5912 addrconf_wq = create_workqueue("ipv6_addrconf");
5913 if (!addrconf_wq) {
5914 err = -ENOMEM;
5915 goto out_nowq;
5916 }
5917
5918 /* The addrconf netdev notifier requires that loopback_dev
5919 * has it's ipv6 private information allocated and setup
5920 * before it can bring up and give link-local addresses
5921 * to other devices which are up.
5922 *
5923 * Unfortunately, loopback_dev is not necessarily the first
5924 * entry in the global dev_base list of net devices. In fact,
5925 * it is likely to be the very last entry on that list.
5926 * So this causes the notifier registry below to try and
5927 * give link-local addresses to all devices besides loopback_dev
5928 * first, then loopback_dev, which cases all the non-loopback_dev
5929 * devices to fail to get a link-local address.
5930 *
5931 * So, as a temporary fix, allocate the ipv6 structure for
5932 * loopback_dev first by hand.
5933 * Longer term, all of the dependencies ipv6 has upon the loopback
5934 * device and it being up should be removed.
5935 */
5936 rtnl_lock();
5937 idev = ipv6_add_dev(init_net.loopback_dev);
5938 rtnl_unlock();
5939 if (IS_ERR(idev)) {
5940 err = PTR_ERR(idev);
5941 goto errlo;
5942 }
5943
5944 ip6_route_init_special_entries();
5945
5946 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5947 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5948
5949 register_netdevice_notifier(&ipv6_dev_notf);
5950
5951 addrconf_verify();
5952
5953 rtnl_af_register(&inet6_ops);
5954
5955 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5956 NULL);
5957 if (err < 0)
5958 goto errout;
5959
5960 /* Only the first call to __rtnl_register can fail */
5961 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5962 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5963 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5964 inet6_dump_ifaddr, NULL);
5965 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5966 inet6_dump_ifmcaddr, NULL);
5967 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5968 inet6_dump_ifacaddr, NULL);
5969 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5970 inet6_netconf_dump_devconf, NULL);
5971
5972 ipv6_addr_label_rtnl_register();
5973
5974 return 0;
5975 errout:
5976 rtnl_af_unregister(&inet6_ops);
5977 unregister_netdevice_notifier(&ipv6_dev_notf);
5978 errlo:
5979 destroy_workqueue(addrconf_wq);
5980 out_nowq:
5981 unregister_pernet_subsys(&addrconf_ops);
5982 out_addrlabel:
5983 ipv6_addr_label_cleanup();
5984 out:
5985 return err;
5986 }
5987
5988 void addrconf_cleanup(void)
5989 {
5990 struct net_device *dev;
5991 int i;
5992
5993 unregister_netdevice_notifier(&ipv6_dev_notf);
5994 unregister_pernet_subsys(&addrconf_ops);
5995 ipv6_addr_label_cleanup();
5996
5997 rtnl_lock();
5998
5999 __rtnl_af_unregister(&inet6_ops);
6000
6001 /* clean dev list */
6002 for_each_netdev(&init_net, dev) {
6003 if (__in6_dev_get(dev) == NULL)
6004 continue;
6005 addrconf_ifdown(dev, 1);
6006 }
6007 addrconf_ifdown(init_net.loopback_dev, 2);
6008
6009 /*
6010 * Check hash table.
6011 */
6012 spin_lock_bh(&addrconf_hash_lock);
6013 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6014 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6015 spin_unlock_bh(&addrconf_hash_lock);
6016 cancel_delayed_work(&addr_chk_work);
6017 rtnl_unlock();
6018
6019 destroy_workqueue(addrconf_wq);
6020 }
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