]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - net/ipv6/addrconf.c
projects / mirror_ubuntu-bionic-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
IPv6: fix DESYNC_FACTOR
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_addr.h>
53 #include <linux/if_arp.h>
54 #include <linux/if_arcnet.h>
55 #include <linux/if_infiniband.h>
56 #include <linux/route.h>
57 #include <linux/inetdevice.h>
58 #include <linux/init.h>
59 #include <linux/slab.h>
60 #ifdef CONFIG_SYSCTL
61 #include <linux/sysctl.h>
62 #endif
63 #include <linux/capability.h>
64 #include <linux/delay.h>
65 #include <linux/notifier.h>
66 #include <linux/string.h>
67 #include <linux/hash.h>
68
69 #include <net/net_namespace.h>
70 #include <net/sock.h>
71 #include <net/snmp.h>
72
73 #include <net/6lowpan.h>
74 #include <net/firewire.h>
75 #include <net/ipv6.h>
76 #include <net/protocol.h>
77 #include <net/ndisc.h>
78 #include <net/ip6_route.h>
79 #include <net/addrconf.h>
80 #include <net/tcp.h>
81 #include <net/ip.h>
82 #include <net/netlink.h>
83 #include <net/pkt_sched.h>
84 #include <net/l3mdev.h>
85 #include <linux/if_tunnel.h>
86 #include <linux/rtnetlink.h>
87 #include <linux/netconf.h>
88 #include <linux/random.h>
89 #include <linux/uaccess.h>
90 #include <asm/unaligned.h>
91
92 #include <linux/proc_fs.h>
93 #include <linux/seq_file.h>
94 #include <linux/export.h>
95
96 /* Set to 3 to get tracing... */
97 #define ACONF_DEBUG 2
98
99 #if ACONF_DEBUG >= 3
100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
101 #else
102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
103 #endif
104
105 #define INFINITY_LIFE_TIME 0xFFFFFFFF
106
107 #define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
110 static inline u32 cstamp_delta(unsigned long cstamp)
111 {
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113 }
114
115 static inline s32 rfc3315_s14_backoff_init(s32 irt)
116 {
117 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
118 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
119 do_div(tmp, 1000000);
120 return (s32)tmp;
121 }
122
123 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
124 {
125 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
126 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
127 do_div(tmp, 1000000);
128 if ((s32)tmp > mrt) {
129 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
130 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
131 do_div(tmp, 1000000);
132 }
133 return (s32)tmp;
134 }
135
136 #ifdef CONFIG_SYSCTL
137 static int addrconf_sysctl_register(struct inet6_dev *idev);
138 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
139 #else
140 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
141 {
142 return 0;
143 }
144
145 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
146 {
147 }
148 #endif
149
150 static void ipv6_regen_rndid(struct inet6_dev *idev);
151 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
152
153 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
154 static int ipv6_count_addresses(struct inet6_dev *idev);
155 static int ipv6_generate_stable_address(struct in6_addr *addr,
156 u8 dad_count,
157 const struct inet6_dev *idev);
158
159 /*
160 * Configured unicast address hash table
161 */
162 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
163 static DEFINE_SPINLOCK(addrconf_hash_lock);
164
165 static void addrconf_verify(void);
166 static void addrconf_verify_rtnl(void);
167 static void addrconf_verify_work(struct work_struct *);
168
169 static struct workqueue_struct *addrconf_wq;
170 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
171
172 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
173 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
174
175 static void addrconf_type_change(struct net_device *dev,
176 unsigned long event);
177 static int addrconf_ifdown(struct net_device *dev, int how);
178
179 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
180 int plen,
181 const struct net_device *dev,
182 u32 flags, u32 noflags);
183
184 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
185 static void addrconf_dad_work(struct work_struct *w);
186 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
187 static void addrconf_dad_run(struct inet6_dev *idev);
188 static void addrconf_rs_timer(unsigned long data);
189 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
190 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191
192 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
193 struct prefix_info *pinfo);
194 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
195 struct net_device *dev);
196
197 static struct ipv6_devconf ipv6_devconf __read_mostly = {
198 .forwarding = 0,
199 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
200 .mtu6 = IPV6_MIN_MTU,
201 .accept_ra = 1,
202 .accept_redirects = 1,
203 .autoconf = 1,
204 .force_mld_version = 0,
205 .mldv1_unsolicited_report_interval = 10 * HZ,
206 .mldv2_unsolicited_report_interval = HZ,
207 .dad_transmits = 1,
208 .rtr_solicits = MAX_RTR_SOLICITATIONS,
209 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
210 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
212 .use_tempaddr = 0,
213 .temp_valid_lft = TEMP_VALID_LIFETIME,
214 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
215 .regen_max_retry = REGEN_MAX_RETRY,
216 .max_desync_factor = MAX_DESYNC_FACTOR,
217 .max_addresses = IPV6_MAX_ADDRESSES,
218 .accept_ra_defrtr = 1,
219 .accept_ra_from_local = 0,
220 .accept_ra_min_hop_limit= 1,
221 .accept_ra_pinfo = 1,
222 #ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
224 .rtr_probe_interval = 60 * HZ,
225 #ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227 #endif
228 #endif
229 .proxy_ndp = 0,
230 .accept_source_route = 0, /* we do not accept RH0 by default. */
231 .disable_ipv6 = 0,
232 .accept_dad = 1,
233 .suppress_frag_ndisc = 1,
234 .accept_ra_mtu = 1,
235 .stable_secret = {
236 .initialized = false,
237 },
238 .use_oif_addrs_only = 0,
239 .ignore_routes_with_linkdown = 0,
240 .keep_addr_on_down = 0,
241 };
242
243 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
244 .forwarding = 0,
245 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
246 .mtu6 = IPV6_MIN_MTU,
247 .accept_ra = 1,
248 .accept_redirects = 1,
249 .autoconf = 1,
250 .force_mld_version = 0,
251 .mldv1_unsolicited_report_interval = 10 * HZ,
252 .mldv2_unsolicited_report_interval = HZ,
253 .dad_transmits = 1,
254 .rtr_solicits = MAX_RTR_SOLICITATIONS,
255 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
256 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
257 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
258 .use_tempaddr = 0,
259 .temp_valid_lft = TEMP_VALID_LIFETIME,
260 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
261 .regen_max_retry = REGEN_MAX_RETRY,
262 .max_desync_factor = MAX_DESYNC_FACTOR,
263 .max_addresses = IPV6_MAX_ADDRESSES,
264 .accept_ra_defrtr = 1,
265 .accept_ra_from_local = 0,
266 .accept_ra_min_hop_limit= 1,
267 .accept_ra_pinfo = 1,
268 #ifdef CONFIG_IPV6_ROUTER_PREF
269 .accept_ra_rtr_pref = 1,
270 .rtr_probe_interval = 60 * HZ,
271 #ifdef CONFIG_IPV6_ROUTE_INFO
272 .accept_ra_rt_info_max_plen = 0,
273 #endif
274 #endif
275 .proxy_ndp = 0,
276 .accept_source_route = 0, /* we do not accept RH0 by default. */
277 .disable_ipv6 = 0,
278 .accept_dad = 1,
279 .suppress_frag_ndisc = 1,
280 .accept_ra_mtu = 1,
281 .stable_secret = {
282 .initialized = false,
283 },
284 .use_oif_addrs_only = 0,
285 .ignore_routes_with_linkdown = 0,
286 .keep_addr_on_down = 0,
287 };
288
289 /* Check if a valid qdisc is available */
290 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
291 {
292 return !qdisc_tx_is_noop(dev);
293 }
294
295 static void addrconf_del_rs_timer(struct inet6_dev *idev)
296 {
297 if (del_timer(&idev->rs_timer))
298 __in6_dev_put(idev);
299 }
300
301 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
302 {
303 if (cancel_delayed_work(&ifp->dad_work))
304 __in6_ifa_put(ifp);
305 }
306
307 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
308 unsigned long when)
309 {
310 if (!timer_pending(&idev->rs_timer))
311 in6_dev_hold(idev);
312 mod_timer(&idev->rs_timer, jiffies + when);
313 }
314
315 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
316 unsigned long delay)
317 {
318 if (!delayed_work_pending(&ifp->dad_work))
319 in6_ifa_hold(ifp);
320 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
321 }
322
323 static int snmp6_alloc_dev(struct inet6_dev *idev)
324 {
325 int i;
326
327 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
328 if (!idev->stats.ipv6)
329 goto err_ip;
330
331 for_each_possible_cpu(i) {
332 struct ipstats_mib *addrconf_stats;
333 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
334 u64_stats_init(&addrconf_stats->syncp);
335 }
336
337
338 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
339 GFP_KERNEL);
340 if (!idev->stats.icmpv6dev)
341 goto err_icmp;
342 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
343 GFP_KERNEL);
344 if (!idev->stats.icmpv6msgdev)
345 goto err_icmpmsg;
346
347 return 0;
348
349 err_icmpmsg:
350 kfree(idev->stats.icmpv6dev);
351 err_icmp:
352 free_percpu(idev->stats.ipv6);
353 err_ip:
354 return -ENOMEM;
355 }
356
357 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
358 {
359 struct inet6_dev *ndev;
360 int err = -ENOMEM;
361
362 ASSERT_RTNL();
363
364 if (dev->mtu < IPV6_MIN_MTU)
365 return ERR_PTR(-EINVAL);
366
367 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
368 if (!ndev)
369 return ERR_PTR(err);
370
371 rwlock_init(&ndev->lock);
372 ndev->dev = dev;
373 INIT_LIST_HEAD(&ndev->addr_list);
374 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
375 (unsigned long)ndev);
376 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
377
378 if (ndev->cnf.stable_secret.initialized)
379 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
380 else
381 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
382
383 ndev->cnf.mtu6 = dev->mtu;
384 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
385 if (!ndev->nd_parms) {
386 kfree(ndev);
387 return ERR_PTR(err);
388 }
389 if (ndev->cnf.forwarding)
390 dev_disable_lro(dev);
391 /* We refer to the device */
392 dev_hold(dev);
393
394 if (snmp6_alloc_dev(ndev) < 0) {
395 ADBG(KERN_WARNING
396 "%s: cannot allocate memory for statistics; dev=%s.\n",
397 __func__, dev->name);
398 neigh_parms_release(&nd_tbl, ndev->nd_parms);
399 dev_put(dev);
400 kfree(ndev);
401 return ERR_PTR(err);
402 }
403
404 if (snmp6_register_dev(ndev) < 0) {
405 ADBG(KERN_WARNING
406 "%s: cannot create /proc/net/dev_snmp6/%s\n",
407 __func__, dev->name);
408 goto err_release;
409 }
410
411 /* One reference from device. */
412 in6_dev_hold(ndev);
413
414 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
415 ndev->cnf.accept_dad = -1;
416
417 #if IS_ENABLED(CONFIG_IPV6_SIT)
418 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
419 pr_info("%s: Disabled Multicast RS\n", dev->name);
420 ndev->cnf.rtr_solicits = 0;
421 }
422 #endif
423
424 INIT_LIST_HEAD(&ndev->tempaddr_list);
425 ndev->desync_factor = U32_MAX;
426 if ((dev->flags&IFF_LOOPBACK) ||
427 dev->type == ARPHRD_TUNNEL ||
428 dev->type == ARPHRD_TUNNEL6 ||
429 dev->type == ARPHRD_SIT ||
430 dev->type == ARPHRD_NONE) {
431 ndev->cnf.use_tempaddr = -1;
432 } else
433 ipv6_regen_rndid(ndev);
434
435 ndev->token = in6addr_any;
436
437 if (netif_running(dev) && addrconf_qdisc_ok(dev))
438 ndev->if_flags |= IF_READY;
439
440 ipv6_mc_init_dev(ndev);
441 ndev->tstamp = jiffies;
442 err = addrconf_sysctl_register(ndev);
443 if (err) {
444 ipv6_mc_destroy_dev(ndev);
445 snmp6_unregister_dev(ndev);
446 goto err_release;
447 }
448 /* protected by rtnl_lock */
449 rcu_assign_pointer(dev->ip6_ptr, ndev);
450
451 /* Join interface-local all-node multicast group */
452 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
453
454 /* Join all-node multicast group */
455 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
456
457 /* Join all-router multicast group if forwarding is set */
458 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
460
461 return ndev;
462
463 err_release:
464 neigh_parms_release(&nd_tbl, ndev->nd_parms);
465 ndev->dead = 1;
466 in6_dev_finish_destroy(ndev);
467 return ERR_PTR(err);
468 }
469
470 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
471 {
472 struct inet6_dev *idev;
473
474 ASSERT_RTNL();
475
476 idev = __in6_dev_get(dev);
477 if (!idev) {
478 idev = ipv6_add_dev(dev);
479 if (IS_ERR(idev))
480 return NULL;
481 }
482
483 if (dev->flags&IFF_UP)
484 ipv6_mc_up(idev);
485 return idev;
486 }
487
488 static int inet6_netconf_msgsize_devconf(int type)
489 {
490 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
491 + nla_total_size(4); /* NETCONFA_IFINDEX */
492 bool all = false;
493
494 if (type == NETCONFA_ALL)
495 all = true;
496
497 if (all || type == NETCONFA_FORWARDING)
498 size += nla_total_size(4);
499 #ifdef CONFIG_IPV6_MROUTE
500 if (all || type == NETCONFA_MC_FORWARDING)
501 size += nla_total_size(4);
502 #endif
503 if (all || type == NETCONFA_PROXY_NEIGH)
504 size += nla_total_size(4);
505
506 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
507 size += nla_total_size(4);
508
509 return size;
510 }
511
512 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
513 struct ipv6_devconf *devconf, u32 portid,
514 u32 seq, int event, unsigned int flags,
515 int type)
516 {
517 struct nlmsghdr *nlh;
518 struct netconfmsg *ncm;
519 bool all = false;
520
521 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
522 flags);
523 if (!nlh)
524 return -EMSGSIZE;
525
526 if (type == NETCONFA_ALL)
527 all = true;
528
529 ncm = nlmsg_data(nlh);
530 ncm->ncm_family = AF_INET6;
531
532 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
533 goto nla_put_failure;
534
535 if ((all || type == NETCONFA_FORWARDING) &&
536 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
537 goto nla_put_failure;
538 #ifdef CONFIG_IPV6_MROUTE
539 if ((all || type == NETCONFA_MC_FORWARDING) &&
540 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
541 devconf->mc_forwarding) < 0)
542 goto nla_put_failure;
543 #endif
544 if ((all || type == NETCONFA_PROXY_NEIGH) &&
545 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
546 goto nla_put_failure;
547
548 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
549 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
550 devconf->ignore_routes_with_linkdown) < 0)
551 goto nla_put_failure;
552
553 nlmsg_end(skb, nlh);
554 return 0;
555
556 nla_put_failure:
557 nlmsg_cancel(skb, nlh);
558 return -EMSGSIZE;
559 }
560
561 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
562 struct ipv6_devconf *devconf)
563 {
564 struct sk_buff *skb;
565 int err = -ENOBUFS;
566
567 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
568 if (!skb)
569 goto errout;
570
571 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
572 RTM_NEWNETCONF, 0, type);
573 if (err < 0) {
574 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
575 WARN_ON(err == -EMSGSIZE);
576 kfree_skb(skb);
577 goto errout;
578 }
579 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
580 return;
581 errout:
582 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
583 }
584
585 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
586 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
587 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
588 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
589 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
590 };
591
592 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
593 struct nlmsghdr *nlh)
594 {
595 struct net *net = sock_net(in_skb->sk);
596 struct nlattr *tb[NETCONFA_MAX+1];
597 struct netconfmsg *ncm;
598 struct sk_buff *skb;
599 struct ipv6_devconf *devconf;
600 struct inet6_dev *in6_dev;
601 struct net_device *dev;
602 int ifindex;
603 int err;
604
605 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
606 devconf_ipv6_policy);
607 if (err < 0)
608 goto errout;
609
610 err = -EINVAL;
611 if (!tb[NETCONFA_IFINDEX])
612 goto errout;
613
614 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
615 switch (ifindex) {
616 case NETCONFA_IFINDEX_ALL:
617 devconf = net->ipv6.devconf_all;
618 break;
619 case NETCONFA_IFINDEX_DEFAULT:
620 devconf = net->ipv6.devconf_dflt;
621 break;
622 default:
623 dev = __dev_get_by_index(net, ifindex);
624 if (!dev)
625 goto errout;
626 in6_dev = __in6_dev_get(dev);
627 if (!in6_dev)
628 goto errout;
629 devconf = &in6_dev->cnf;
630 break;
631 }
632
633 err = -ENOBUFS;
634 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
635 if (!skb)
636 goto errout;
637
638 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
639 NETLINK_CB(in_skb).portid,
640 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
641 NETCONFA_ALL);
642 if (err < 0) {
643 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
644 WARN_ON(err == -EMSGSIZE);
645 kfree_skb(skb);
646 goto errout;
647 }
648 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
649 errout:
650 return err;
651 }
652
653 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
654 struct netlink_callback *cb)
655 {
656 struct net *net = sock_net(skb->sk);
657 int h, s_h;
658 int idx, s_idx;
659 struct net_device *dev;
660 struct inet6_dev *idev;
661 struct hlist_head *head;
662
663 s_h = cb->args[0];
664 s_idx = idx = cb->args[1];
665
666 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
667 idx = 0;
668 head = &net->dev_index_head[h];
669 rcu_read_lock();
670 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
671 net->dev_base_seq;
672 hlist_for_each_entry_rcu(dev, head, index_hlist) {
673 if (idx < s_idx)
674 goto cont;
675 idev = __in6_dev_get(dev);
676 if (!idev)
677 goto cont;
678
679 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
680 &idev->cnf,
681 NETLINK_CB(cb->skb).portid,
682 cb->nlh->nlmsg_seq,
683 RTM_NEWNETCONF,
684 NLM_F_MULTI,
685 NETCONFA_ALL) < 0) {
686 rcu_read_unlock();
687 goto done;
688 }
689 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
690 cont:
691 idx++;
692 }
693 rcu_read_unlock();
694 }
695 if (h == NETDEV_HASHENTRIES) {
696 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
697 net->ipv6.devconf_all,
698 NETLINK_CB(cb->skb).portid,
699 cb->nlh->nlmsg_seq,
700 RTM_NEWNETCONF, NLM_F_MULTI,
701 NETCONFA_ALL) < 0)
702 goto done;
703 else
704 h++;
705 }
706 if (h == NETDEV_HASHENTRIES + 1) {
707 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
708 net->ipv6.devconf_dflt,
709 NETLINK_CB(cb->skb).portid,
710 cb->nlh->nlmsg_seq,
711 RTM_NEWNETCONF, NLM_F_MULTI,
712 NETCONFA_ALL) < 0)
713 goto done;
714 else
715 h++;
716 }
717 done:
718 cb->args[0] = h;
719 cb->args[1] = idx;
720
721 return skb->len;
722 }
723
724 #ifdef CONFIG_SYSCTL
725 static void dev_forward_change(struct inet6_dev *idev)
726 {
727 struct net_device *dev;
728 struct inet6_ifaddr *ifa;
729
730 if (!idev)
731 return;
732 dev = idev->dev;
733 if (idev->cnf.forwarding)
734 dev_disable_lro(dev);
735 if (dev->flags & IFF_MULTICAST) {
736 if (idev->cnf.forwarding) {
737 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
738 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
739 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
740 } else {
741 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
742 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
743 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
744 }
745 }
746
747 list_for_each_entry(ifa, &idev->addr_list, if_list) {
748 if (ifa->flags&IFA_F_TENTATIVE)
749 continue;
750 if (idev->cnf.forwarding)
751 addrconf_join_anycast(ifa);
752 else
753 addrconf_leave_anycast(ifa);
754 }
755 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
756 dev->ifindex, &idev->cnf);
757 }
758
759
760 static void addrconf_forward_change(struct net *net, __s32 newf)
761 {
762 struct net_device *dev;
763 struct inet6_dev *idev;
764
765 for_each_netdev(net, dev) {
766 idev = __in6_dev_get(dev);
767 if (idev) {
768 int changed = (!idev->cnf.forwarding) ^ (!newf);
769 idev->cnf.forwarding = newf;
770 if (changed)
771 dev_forward_change(idev);
772 }
773 }
774 }
775
776 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
777 {
778 struct net *net;
779 int old;
780
781 if (!rtnl_trylock())
782 return restart_syscall();
783
784 net = (struct net *)table->extra2;
785 old = *p;
786 *p = newf;
787
788 if (p == &net->ipv6.devconf_dflt->forwarding) {
789 if ((!newf) ^ (!old))
790 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
791 NETCONFA_IFINDEX_DEFAULT,
792 net->ipv6.devconf_dflt);
793 rtnl_unlock();
794 return 0;
795 }
796
797 if (p == &net->ipv6.devconf_all->forwarding) {
798 int old_dflt = net->ipv6.devconf_dflt->forwarding;
799
800 net->ipv6.devconf_dflt->forwarding = newf;
801 if ((!newf) ^ (!old_dflt))
802 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
803 NETCONFA_IFINDEX_DEFAULT,
804 net->ipv6.devconf_dflt);
805
806 addrconf_forward_change(net, newf);
807 if ((!newf) ^ (!old))
808 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
809 NETCONFA_IFINDEX_ALL,
810 net->ipv6.devconf_all);
811 } else if ((!newf) ^ (!old))
812 dev_forward_change((struct inet6_dev *)table->extra1);
813 rtnl_unlock();
814
815 if (newf)
816 rt6_purge_dflt_routers(net);
817 return 1;
818 }
819
820 static void addrconf_linkdown_change(struct net *net, __s32 newf)
821 {
822 struct net_device *dev;
823 struct inet6_dev *idev;
824
825 for_each_netdev(net, dev) {
826 idev = __in6_dev_get(dev);
827 if (idev) {
828 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
829
830 idev->cnf.ignore_routes_with_linkdown = newf;
831 if (changed)
832 inet6_netconf_notify_devconf(dev_net(dev),
833 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
834 dev->ifindex,
835 &idev->cnf);
836 }
837 }
838 }
839
840 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
841 {
842 struct net *net;
843 int old;
844
845 if (!rtnl_trylock())
846 return restart_syscall();
847
848 net = (struct net *)table->extra2;
849 old = *p;
850 *p = newf;
851
852 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
853 if ((!newf) ^ (!old))
854 inet6_netconf_notify_devconf(net,
855 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
856 NETCONFA_IFINDEX_DEFAULT,
857 net->ipv6.devconf_dflt);
858 rtnl_unlock();
859 return 0;
860 }
861
862 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
863 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
864 addrconf_linkdown_change(net, newf);
865 if ((!newf) ^ (!old))
866 inet6_netconf_notify_devconf(net,
867 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
868 NETCONFA_IFINDEX_ALL,
869 net->ipv6.devconf_all);
870 }
871 rtnl_unlock();
872
873 return 1;
874 }
875
876 #endif
877
878 /* Nobody refers to this ifaddr, destroy it */
879 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
880 {
881 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
882
883 #ifdef NET_REFCNT_DEBUG
884 pr_debug("%s\n", __func__);
885 #endif
886
887 in6_dev_put(ifp->idev);
888
889 if (cancel_delayed_work(&ifp->dad_work))
890 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
891 ifp);
892
893 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
894 pr_warn("Freeing alive inet6 address %p\n", ifp);
895 return;
896 }
897 ip6_rt_put(ifp->rt);
898
899 kfree_rcu(ifp, rcu);
900 }
901
902 static void
903 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
904 {
905 struct list_head *p;
906 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
907
908 /*
909 * Each device address list is sorted in order of scope -
910 * global before linklocal.
911 */
912 list_for_each(p, &idev->addr_list) {
913 struct inet6_ifaddr *ifa
914 = list_entry(p, struct inet6_ifaddr, if_list);
915 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
916 break;
917 }
918
919 list_add_tail(&ifp->if_list, p);
920 }
921
922 static u32 inet6_addr_hash(const struct in6_addr *addr)
923 {
924 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
925 }
926
927 /* On success it returns ifp with increased reference count */
928
929 static struct inet6_ifaddr *
930 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
931 const struct in6_addr *peer_addr, int pfxlen,
932 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
933 {
934 struct inet6_ifaddr *ifa = NULL;
935 struct rt6_info *rt;
936 unsigned int hash;
937 int err = 0;
938 int addr_type = ipv6_addr_type(addr);
939
940 if (addr_type == IPV6_ADDR_ANY ||
941 addr_type & IPV6_ADDR_MULTICAST ||
942 (!(idev->dev->flags & IFF_LOOPBACK) &&
943 addr_type & IPV6_ADDR_LOOPBACK))
944 return ERR_PTR(-EADDRNOTAVAIL);
945
946 rcu_read_lock_bh();
947 if (idev->dead) {
948 err = -ENODEV; /*XXX*/
949 goto out2;
950 }
951
952 if (idev->cnf.disable_ipv6) {
953 err = -EACCES;
954 goto out2;
955 }
956
957 spin_lock(&addrconf_hash_lock);
958
959 /* Ignore adding duplicate addresses on an interface */
960 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
961 ADBG("ipv6_add_addr: already assigned\n");
962 err = -EEXIST;
963 goto out;
964 }
965
966 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
967
968 if (!ifa) {
969 ADBG("ipv6_add_addr: malloc failed\n");
970 err = -ENOBUFS;
971 goto out;
972 }
973
974 rt = addrconf_dst_alloc(idev, addr, false);
975 if (IS_ERR(rt)) {
976 err = PTR_ERR(rt);
977 goto out;
978 }
979
980 neigh_parms_data_state_setall(idev->nd_parms);
981
982 ifa->addr = *addr;
983 if (peer_addr)
984 ifa->peer_addr = *peer_addr;
985
986 spin_lock_init(&ifa->lock);
987 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
988 INIT_HLIST_NODE(&ifa->addr_lst);
989 ifa->scope = scope;
990 ifa->prefix_len = pfxlen;
991 ifa->flags = flags | IFA_F_TENTATIVE;
992 ifa->valid_lft = valid_lft;
993 ifa->prefered_lft = prefered_lft;
994 ifa->cstamp = ifa->tstamp = jiffies;
995 ifa->tokenized = false;
996
997 ifa->rt = rt;
998
999 ifa->idev = idev;
1000 in6_dev_hold(idev);
1001 /* For caller */
1002 in6_ifa_hold(ifa);
1003
1004 /* Add to big hash table */
1005 hash = inet6_addr_hash(addr);
1006
1007 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1008 spin_unlock(&addrconf_hash_lock);
1009
1010 write_lock(&idev->lock);
1011 /* Add to inet6_dev unicast addr list. */
1012 ipv6_link_dev_addr(idev, ifa);
1013
1014 if (ifa->flags&IFA_F_TEMPORARY) {
1015 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1016 in6_ifa_hold(ifa);
1017 }
1018
1019 in6_ifa_hold(ifa);
1020 write_unlock(&idev->lock);
1021 out2:
1022 rcu_read_unlock_bh();
1023
1024 if (likely(err == 0))
1025 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1026 else {
1027 kfree(ifa);
1028 ifa = ERR_PTR(err);
1029 }
1030
1031 return ifa;
1032 out:
1033 spin_unlock(&addrconf_hash_lock);
1034 goto out2;
1035 }
1036
1037 enum cleanup_prefix_rt_t {
1038 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1039 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1040 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1041 };
1042
1043 /*
1044 * Check, whether the prefix for ifp would still need a prefix route
1045 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1046 * constants.
1047 *
1048 * 1) we don't purge prefix if address was not permanent.
1049 * prefix is managed by its own lifetime.
1050 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1051 * 3) if there are no addresses, delete prefix.
1052 * 4) if there are still other permanent address(es),
1053 * corresponding prefix is still permanent.
1054 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1055 * don't purge the prefix, assume user space is managing it.
1056 * 6) otherwise, update prefix lifetime to the
1057 * longest valid lifetime among the corresponding
1058 * addresses on the device.
1059 * Note: subsequent RA will update lifetime.
1060 **/
1061 static enum cleanup_prefix_rt_t
1062 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1063 {
1064 struct inet6_ifaddr *ifa;
1065 struct inet6_dev *idev = ifp->idev;
1066 unsigned long lifetime;
1067 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1068
1069 *expires = jiffies;
1070
1071 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1072 if (ifa == ifp)
1073 continue;
1074 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1075 ifp->prefix_len))
1076 continue;
1077 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1078 return CLEANUP_PREFIX_RT_NOP;
1079
1080 action = CLEANUP_PREFIX_RT_EXPIRE;
1081
1082 spin_lock(&ifa->lock);
1083
1084 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1085 /*
1086 * Note: Because this address is
1087 * not permanent, lifetime <
1088 * LONG_MAX / HZ here.
1089 */
1090 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1091 *expires = ifa->tstamp + lifetime * HZ;
1092 spin_unlock(&ifa->lock);
1093 }
1094
1095 return action;
1096 }
1097
1098 static void
1099 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1100 {
1101 struct rt6_info *rt;
1102
1103 rt = addrconf_get_prefix_route(&ifp->addr,
1104 ifp->prefix_len,
1105 ifp->idev->dev,
1106 0, RTF_GATEWAY | RTF_DEFAULT);
1107 if (rt) {
1108 if (del_rt)
1109 ip6_del_rt(rt);
1110 else {
1111 if (!(rt->rt6i_flags & RTF_EXPIRES))
1112 rt6_set_expires(rt, expires);
1113 ip6_rt_put(rt);
1114 }
1115 }
1116 }
1117
1118
1119 /* This function wants to get referenced ifp and releases it before return */
1120
1121 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1122 {
1123 int state;
1124 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1125 unsigned long expires;
1126
1127 ASSERT_RTNL();
1128
1129 spin_lock_bh(&ifp->lock);
1130 state = ifp->state;
1131 ifp->state = INET6_IFADDR_STATE_DEAD;
1132 spin_unlock_bh(&ifp->lock);
1133
1134 if (state == INET6_IFADDR_STATE_DEAD)
1135 goto out;
1136
1137 spin_lock_bh(&addrconf_hash_lock);
1138 hlist_del_init_rcu(&ifp->addr_lst);
1139 spin_unlock_bh(&addrconf_hash_lock);
1140
1141 write_lock_bh(&ifp->idev->lock);
1142
1143 if (ifp->flags&IFA_F_TEMPORARY) {
1144 list_del(&ifp->tmp_list);
1145 if (ifp->ifpub) {
1146 in6_ifa_put(ifp->ifpub);
1147 ifp->ifpub = NULL;
1148 }
1149 __in6_ifa_put(ifp);
1150 }
1151
1152 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1153 action = check_cleanup_prefix_route(ifp, &expires);
1154
1155 list_del_init(&ifp->if_list);
1156 __in6_ifa_put(ifp);
1157
1158 write_unlock_bh(&ifp->idev->lock);
1159
1160 addrconf_del_dad_work(ifp);
1161
1162 ipv6_ifa_notify(RTM_DELADDR, ifp);
1163
1164 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1165
1166 if (action != CLEANUP_PREFIX_RT_NOP) {
1167 cleanup_prefix_route(ifp, expires,
1168 action == CLEANUP_PREFIX_RT_DEL);
1169 }
1170
1171 /* clean up prefsrc entries */
1172 rt6_remove_prefsrc(ifp);
1173 out:
1174 in6_ifa_put(ifp);
1175 }
1176
1177 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1178 {
1179 struct inet6_dev *idev = ifp->idev;
1180 struct in6_addr addr, *tmpaddr;
1181 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1182 unsigned long regen_advance;
1183 int tmp_plen;
1184 int ret = 0;
1185 u32 addr_flags;
1186 unsigned long now = jiffies;
1187 long max_desync_factor;
1188
1189 write_lock_bh(&idev->lock);
1190 if (ift) {
1191 spin_lock_bh(&ift->lock);
1192 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1193 spin_unlock_bh(&ift->lock);
1194 tmpaddr = &addr;
1195 } else {
1196 tmpaddr = NULL;
1197 }
1198 retry:
1199 in6_dev_hold(idev);
1200 if (idev->cnf.use_tempaddr <= 0) {
1201 write_unlock_bh(&idev->lock);
1202 pr_info("%s: use_tempaddr is disabled\n", __func__);
1203 in6_dev_put(idev);
1204 ret = -1;
1205 goto out;
1206 }
1207 spin_lock_bh(&ifp->lock);
1208 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1209 idev->cnf.use_tempaddr = -1; /*XXX*/
1210 spin_unlock_bh(&ifp->lock);
1211 write_unlock_bh(&idev->lock);
1212 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1213 __func__);
1214 in6_dev_put(idev);
1215 ret = -1;
1216 goto out;
1217 }
1218 in6_ifa_hold(ifp);
1219 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1220 ipv6_try_regen_rndid(idev, tmpaddr);
1221 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1222 age = (now - ifp->tstamp) / HZ;
1223
1224 regen_advance = idev->cnf.regen_max_retry *
1225 idev->cnf.dad_transmits *
1226 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1227
1228 /* recalculate max_desync_factor each time and update
1229 * idev->desync_factor if it's larger
1230 */
1231 max_desync_factor = min_t(__u32,
1232 idev->cnf.max_desync_factor,
1233 idev->cnf.temp_prefered_lft - regen_advance);
1234
1235 if (unlikely(idev->desync_factor > max_desync_factor)) {
1236 if (max_desync_factor > 0) {
1237 get_random_bytes(&idev->desync_factor,
1238 sizeof(idev->desync_factor));
1239 idev->desync_factor %= max_desync_factor;
1240 } else {
1241 idev->desync_factor = 0;
1242 }
1243 }
1244
1245 tmp_valid_lft = min_t(__u32,
1246 ifp->valid_lft,
1247 idev->cnf.temp_valid_lft + age);
1248 tmp_prefered_lft = idev->cnf.temp_prefered_lft + age -
1249 idev->desync_factor;
1250 /* guard against underflow in case of concurrent updates to cnf */
1251 if (unlikely(tmp_prefered_lft < 0))
1252 tmp_prefered_lft = 0;
1253 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1254 tmp_plen = ifp->prefix_len;
1255 tmp_tstamp = ifp->tstamp;
1256 spin_unlock_bh(&ifp->lock);
1257
1258 write_unlock_bh(&idev->lock);
1259
1260 /* A temporary address is created only if this calculated Preferred
1261 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1262 * an implementation must not create a temporary address with a zero
1263 * Preferred Lifetime.
1264 * Use age calculation as in addrconf_verify to avoid unnecessary
1265 * temporary addresses being generated.
1266 */
1267 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1268 if (tmp_prefered_lft <= regen_advance + age) {
1269 in6_ifa_put(ifp);
1270 in6_dev_put(idev);
1271 ret = -1;
1272 goto out;
1273 }
1274
1275 addr_flags = IFA_F_TEMPORARY;
1276 /* set in addrconf_prefix_rcv() */
1277 if (ifp->flags & IFA_F_OPTIMISTIC)
1278 addr_flags |= IFA_F_OPTIMISTIC;
1279
1280 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1281 ipv6_addr_scope(&addr), addr_flags,
1282 tmp_valid_lft, tmp_prefered_lft);
1283 if (IS_ERR(ift)) {
1284 in6_ifa_put(ifp);
1285 in6_dev_put(idev);
1286 pr_info("%s: retry temporary address regeneration\n", __func__);
1287 tmpaddr = &addr;
1288 write_lock_bh(&idev->lock);
1289 goto retry;
1290 }
1291
1292 spin_lock_bh(&ift->lock);
1293 ift->ifpub = ifp;
1294 ift->cstamp = now;
1295 ift->tstamp = tmp_tstamp;
1296 spin_unlock_bh(&ift->lock);
1297
1298 addrconf_dad_start(ift);
1299 in6_ifa_put(ift);
1300 in6_dev_put(idev);
1301 out:
1302 return ret;
1303 }
1304
1305 /*
1306 * Choose an appropriate source address (RFC3484)
1307 */
1308 enum {
1309 IPV6_SADDR_RULE_INIT = 0,
1310 IPV6_SADDR_RULE_LOCAL,
1311 IPV6_SADDR_RULE_SCOPE,
1312 IPV6_SADDR_RULE_PREFERRED,
1313 #ifdef CONFIG_IPV6_MIP6
1314 IPV6_SADDR_RULE_HOA,
1315 #endif
1316 IPV6_SADDR_RULE_OIF,
1317 IPV6_SADDR_RULE_LABEL,
1318 IPV6_SADDR_RULE_PRIVACY,
1319 IPV6_SADDR_RULE_ORCHID,
1320 IPV6_SADDR_RULE_PREFIX,
1321 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1322 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1323 #endif
1324 IPV6_SADDR_RULE_MAX
1325 };
1326
1327 struct ipv6_saddr_score {
1328 int rule;
1329 int addr_type;
1330 struct inet6_ifaddr *ifa;
1331 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1332 int scopedist;
1333 int matchlen;
1334 };
1335
1336 struct ipv6_saddr_dst {
1337 const struct in6_addr *addr;
1338 int ifindex;
1339 int scope;
1340 int label;
1341 unsigned int prefs;
1342 };
1343
1344 static inline int ipv6_saddr_preferred(int type)
1345 {
1346 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1347 return 1;
1348 return 0;
1349 }
1350
1351 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1352 {
1353 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1354 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1355 #else
1356 return false;
1357 #endif
1358 }
1359
1360 static int ipv6_get_saddr_eval(struct net *net,
1361 struct ipv6_saddr_score *score,
1362 struct ipv6_saddr_dst *dst,
1363 int i)
1364 {
1365 int ret;
1366
1367 if (i <= score->rule) {
1368 switch (i) {
1369 case IPV6_SADDR_RULE_SCOPE:
1370 ret = score->scopedist;
1371 break;
1372 case IPV6_SADDR_RULE_PREFIX:
1373 ret = score->matchlen;
1374 break;
1375 default:
1376 ret = !!test_bit(i, score->scorebits);
1377 }
1378 goto out;
1379 }
1380
1381 switch (i) {
1382 case IPV6_SADDR_RULE_INIT:
1383 /* Rule 0: remember if hiscore is not ready yet */
1384 ret = !!score->ifa;
1385 break;
1386 case IPV6_SADDR_RULE_LOCAL:
1387 /* Rule 1: Prefer same address */
1388 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1389 break;
1390 case IPV6_SADDR_RULE_SCOPE:
1391 /* Rule 2: Prefer appropriate scope
1392 *
1393 * ret
1394 * ^
1395 * -1 | d 15
1396 * ---+--+-+---> scope
1397 * |
1398 * | d is scope of the destination.
1399 * B-d | \
1400 * | \ <- smaller scope is better if
1401 * B-15 | \ if scope is enough for destination.
1402 * | ret = B - scope (-1 <= scope >= d <= 15).
1403 * d-C-1 | /
1404 * |/ <- greater is better
1405 * -C / if scope is not enough for destination.
1406 * /| ret = scope - C (-1 <= d < scope <= 15).
1407 *
1408 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1409 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1410 * Assume B = 0 and we get C > 29.
1411 */
1412 ret = __ipv6_addr_src_scope(score->addr_type);
1413 if (ret >= dst->scope)
1414 ret = -ret;
1415 else
1416 ret -= 128; /* 30 is enough */
1417 score->scopedist = ret;
1418 break;
1419 case IPV6_SADDR_RULE_PREFERRED:
1420 {
1421 /* Rule 3: Avoid deprecated and optimistic addresses */
1422 u8 avoid = IFA_F_DEPRECATED;
1423
1424 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1425 avoid |= IFA_F_OPTIMISTIC;
1426 ret = ipv6_saddr_preferred(score->addr_type) ||
1427 !(score->ifa->flags & avoid);
1428 break;
1429 }
1430 #ifdef CONFIG_IPV6_MIP6
1431 case IPV6_SADDR_RULE_HOA:
1432 {
1433 /* Rule 4: Prefer home address */
1434 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1435 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1436 break;
1437 }
1438 #endif
1439 case IPV6_SADDR_RULE_OIF:
1440 /* Rule 5: Prefer outgoing interface */
1441 ret = (!dst->ifindex ||
1442 dst->ifindex == score->ifa->idev->dev->ifindex);
1443 break;
1444 case IPV6_SADDR_RULE_LABEL:
1445 /* Rule 6: Prefer matching label */
1446 ret = ipv6_addr_label(net,
1447 &score->ifa->addr, score->addr_type,
1448 score->ifa->idev->dev->ifindex) == dst->label;
1449 break;
1450 case IPV6_SADDR_RULE_PRIVACY:
1451 {
1452 /* Rule 7: Prefer public address
1453 * Note: prefer temporary address if use_tempaddr >= 2
1454 */
1455 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1456 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1457 score->ifa->idev->cnf.use_tempaddr >= 2;
1458 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1459 break;
1460 }
1461 case IPV6_SADDR_RULE_ORCHID:
1462 /* Rule 8-: Prefer ORCHID vs ORCHID or
1463 * non-ORCHID vs non-ORCHID
1464 */
1465 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1466 ipv6_addr_orchid(dst->addr));
1467 break;
1468 case IPV6_SADDR_RULE_PREFIX:
1469 /* Rule 8: Use longest matching prefix */
1470 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1471 if (ret > score->ifa->prefix_len)
1472 ret = score->ifa->prefix_len;
1473 score->matchlen = ret;
1474 break;
1475 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1476 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1477 /* Optimistic addresses still have lower precedence than other
1478 * preferred addresses.
1479 */
1480 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1481 break;
1482 #endif
1483 default:
1484 ret = 0;
1485 }
1486
1487 if (ret)
1488 __set_bit(i, score->scorebits);
1489 score->rule = i;
1490 out:
1491 return ret;
1492 }
1493
1494 static int __ipv6_dev_get_saddr(struct net *net,
1495 struct ipv6_saddr_dst *dst,
1496 struct inet6_dev *idev,
1497 struct ipv6_saddr_score *scores,
1498 int hiscore_idx)
1499 {
1500 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1501
1502 read_lock_bh(&idev->lock);
1503 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1504 int i;
1505
1506 /*
1507 * - Tentative Address (RFC2462 section 5.4)
1508 * - A tentative address is not considered
1509 * "assigned to an interface" in the traditional
1510 * sense, unless it is also flagged as optimistic.
1511 * - Candidate Source Address (section 4)
1512 * - In any case, anycast addresses, multicast
1513 * addresses, and the unspecified address MUST
1514 * NOT be included in a candidate set.
1515 */
1516 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1517 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1518 continue;
1519
1520 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1521
1522 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1523 score->addr_type & IPV6_ADDR_MULTICAST)) {
1524 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1525 idev->dev->name);
1526 continue;
1527 }
1528
1529 score->rule = -1;
1530 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1531
1532 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1533 int minihiscore, miniscore;
1534
1535 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1536 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1537
1538 if (minihiscore > miniscore) {
1539 if (i == IPV6_SADDR_RULE_SCOPE &&
1540 score->scopedist > 0) {
1541 /*
1542 * special case:
1543 * each remaining entry
1544 * has too small (not enough)
1545 * scope, because ifa entries
1546 * are sorted by their scope
1547 * values.
1548 */
1549 goto out;
1550 }
1551 break;
1552 } else if (minihiscore < miniscore) {
1553 if (hiscore->ifa)
1554 in6_ifa_put(hiscore->ifa);
1555
1556 in6_ifa_hold(score->ifa);
1557
1558 swap(hiscore, score);
1559 hiscore_idx = 1 - hiscore_idx;
1560
1561 /* restore our iterator */
1562 score->ifa = hiscore->ifa;
1563
1564 break;
1565 }
1566 }
1567 }
1568 out:
1569 read_unlock_bh(&idev->lock);
1570 return hiscore_idx;
1571 }
1572
1573 static int ipv6_get_saddr_master(struct net *net,
1574 const struct net_device *dst_dev,
1575 const struct net_device *master,
1576 struct ipv6_saddr_dst *dst,
1577 struct ipv6_saddr_score *scores,
1578 int hiscore_idx)
1579 {
1580 struct inet6_dev *idev;
1581
1582 idev = __in6_dev_get(dst_dev);
1583 if (idev)
1584 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1585 scores, hiscore_idx);
1586
1587 idev = __in6_dev_get(master);
1588 if (idev)
1589 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1590 scores, hiscore_idx);
1591
1592 return hiscore_idx;
1593 }
1594
1595 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1596 const struct in6_addr *daddr, unsigned int prefs,
1597 struct in6_addr *saddr)
1598 {
1599 struct ipv6_saddr_score scores[2], *hiscore;
1600 struct ipv6_saddr_dst dst;
1601 struct inet6_dev *idev;
1602 struct net_device *dev;
1603 int dst_type;
1604 bool use_oif_addr = false;
1605 int hiscore_idx = 0;
1606
1607 dst_type = __ipv6_addr_type(daddr);
1608 dst.addr = daddr;
1609 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1610 dst.scope = __ipv6_addr_src_scope(dst_type);
1611 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1612 dst.prefs = prefs;
1613
1614 scores[hiscore_idx].rule = -1;
1615 scores[hiscore_idx].ifa = NULL;
1616
1617 rcu_read_lock();
1618
1619 /* Candidate Source Address (section 4)
1620 * - multicast and link-local destination address,
1621 * the set of candidate source address MUST only
1622 * include addresses assigned to interfaces
1623 * belonging to the same link as the outgoing
1624 * interface.
1625 * (- For site-local destination addresses, the
1626 * set of candidate source addresses MUST only
1627 * include addresses assigned to interfaces
1628 * belonging to the same site as the outgoing
1629 * interface.)
1630 * - "It is RECOMMENDED that the candidate source addresses
1631 * be the set of unicast addresses assigned to the
1632 * interface that will be used to send to the destination
1633 * (the 'outgoing' interface)." (RFC 6724)
1634 */
1635 if (dst_dev) {
1636 idev = __in6_dev_get(dst_dev);
1637 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1638 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1639 (idev && idev->cnf.use_oif_addrs_only)) {
1640 use_oif_addr = true;
1641 }
1642 }
1643
1644 if (use_oif_addr) {
1645 if (idev)
1646 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1647 } else {
1648 const struct net_device *master;
1649 int master_idx = 0;
1650
1651 /* if dst_dev exists and is enslaved to an L3 device, then
1652 * prefer addresses from dst_dev and then the master over
1653 * any other enslaved devices in the L3 domain.
1654 */
1655 master = l3mdev_master_dev_rcu(dst_dev);
1656 if (master) {
1657 master_idx = master->ifindex;
1658
1659 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1660 master, &dst,
1661 scores, hiscore_idx);
1662
1663 if (scores[hiscore_idx].ifa)
1664 goto out;
1665 }
1666
1667 for_each_netdev_rcu(net, dev) {
1668 /* only consider addresses on devices in the
1669 * same L3 domain
1670 */
1671 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1672 continue;
1673 idev = __in6_dev_get(dev);
1674 if (!idev)
1675 continue;
1676 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1677 }
1678 }
1679
1680 out:
1681 rcu_read_unlock();
1682
1683 hiscore = &scores[hiscore_idx];
1684 if (!hiscore->ifa)
1685 return -EADDRNOTAVAIL;
1686
1687 *saddr = hiscore->ifa->addr;
1688 in6_ifa_put(hiscore->ifa);
1689 return 0;
1690 }
1691 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1692
1693 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1694 u32 banned_flags)
1695 {
1696 struct inet6_ifaddr *ifp;
1697 int err = -EADDRNOTAVAIL;
1698
1699 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1700 if (ifp->scope > IFA_LINK)
1701 break;
1702 if (ifp->scope == IFA_LINK &&
1703 !(ifp->flags & banned_flags)) {
1704 *addr = ifp->addr;
1705 err = 0;
1706 break;
1707 }
1708 }
1709 return err;
1710 }
1711
1712 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1713 u32 banned_flags)
1714 {
1715 struct inet6_dev *idev;
1716 int err = -EADDRNOTAVAIL;
1717
1718 rcu_read_lock();
1719 idev = __in6_dev_get(dev);
1720 if (idev) {
1721 read_lock_bh(&idev->lock);
1722 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1723 read_unlock_bh(&idev->lock);
1724 }
1725 rcu_read_unlock();
1726 return err;
1727 }
1728
1729 static int ipv6_count_addresses(struct inet6_dev *idev)
1730 {
1731 int cnt = 0;
1732 struct inet6_ifaddr *ifp;
1733
1734 read_lock_bh(&idev->lock);
1735 list_for_each_entry(ifp, &idev->addr_list, if_list)
1736 cnt++;
1737 read_unlock_bh(&idev->lock);
1738 return cnt;
1739 }
1740
1741 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1742 const struct net_device *dev, int strict)
1743 {
1744 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1745 }
1746 EXPORT_SYMBOL(ipv6_chk_addr);
1747
1748 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1749 const struct net_device *dev, int strict,
1750 u32 banned_flags)
1751 {
1752 struct inet6_ifaddr *ifp;
1753 unsigned int hash = inet6_addr_hash(addr);
1754 u32 ifp_flags;
1755
1756 rcu_read_lock_bh();
1757 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1758 if (!net_eq(dev_net(ifp->idev->dev), net))
1759 continue;
1760 /* Decouple optimistic from tentative for evaluation here.
1761 * Ban optimistic addresses explicitly, when required.
1762 */
1763 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1764 ? (ifp->flags&~IFA_F_TENTATIVE)
1765 : ifp->flags;
1766 if (ipv6_addr_equal(&ifp->addr, addr) &&
1767 !(ifp_flags&banned_flags) &&
1768 (!dev || ifp->idev->dev == dev ||
1769 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1770 rcu_read_unlock_bh();
1771 return 1;
1772 }
1773 }
1774
1775 rcu_read_unlock_bh();
1776 return 0;
1777 }
1778 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1779
1780 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1781 struct net_device *dev)
1782 {
1783 unsigned int hash = inet6_addr_hash(addr);
1784 struct inet6_ifaddr *ifp;
1785
1786 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1787 if (!net_eq(dev_net(ifp->idev->dev), net))
1788 continue;
1789 if (ipv6_addr_equal(&ifp->addr, addr)) {
1790 if (!dev || ifp->idev->dev == dev)
1791 return true;
1792 }
1793 }
1794 return false;
1795 }
1796
1797 /* Compares an address/prefix_len with addresses on device @dev.
1798 * If one is found it returns true.
1799 */
1800 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1801 const unsigned int prefix_len, struct net_device *dev)
1802 {
1803 struct inet6_dev *idev;
1804 struct inet6_ifaddr *ifa;
1805 bool ret = false;
1806
1807 rcu_read_lock();
1808 idev = __in6_dev_get(dev);
1809 if (idev) {
1810 read_lock_bh(&idev->lock);
1811 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1812 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1813 if (ret)
1814 break;
1815 }
1816 read_unlock_bh(&idev->lock);
1817 }
1818 rcu_read_unlock();
1819
1820 return ret;
1821 }
1822 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1823
1824 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1825 {
1826 struct inet6_dev *idev;
1827 struct inet6_ifaddr *ifa;
1828 int onlink;
1829
1830 onlink = 0;
1831 rcu_read_lock();
1832 idev = __in6_dev_get(dev);
1833 if (idev) {
1834 read_lock_bh(&idev->lock);
1835 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1836 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1837 ifa->prefix_len);
1838 if (onlink)
1839 break;
1840 }
1841 read_unlock_bh(&idev->lock);
1842 }
1843 rcu_read_unlock();
1844 return onlink;
1845 }
1846 EXPORT_SYMBOL(ipv6_chk_prefix);
1847
1848 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1849 struct net_device *dev, int strict)
1850 {
1851 struct inet6_ifaddr *ifp, *result = NULL;
1852 unsigned int hash = inet6_addr_hash(addr);
1853
1854 rcu_read_lock_bh();
1855 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1856 if (!net_eq(dev_net(ifp->idev->dev), net))
1857 continue;
1858 if (ipv6_addr_equal(&ifp->addr, addr)) {
1859 if (!dev || ifp->idev->dev == dev ||
1860 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1861 result = ifp;
1862 in6_ifa_hold(ifp);
1863 break;
1864 }
1865 }
1866 }
1867 rcu_read_unlock_bh();
1868
1869 return result;
1870 }
1871
1872 /* Gets referenced address, destroys ifaddr */
1873
1874 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1875 {
1876 if (dad_failed)
1877 ifp->flags |= IFA_F_DADFAILED;
1878
1879 if (ifp->flags&IFA_F_PERMANENT) {
1880 spin_lock_bh(&ifp->lock);
1881 addrconf_del_dad_work(ifp);
1882 ifp->flags |= IFA_F_TENTATIVE;
1883 spin_unlock_bh(&ifp->lock);
1884 if (dad_failed)
1885 ipv6_ifa_notify(0, ifp);
1886 in6_ifa_put(ifp);
1887 } else if (ifp->flags&IFA_F_TEMPORARY) {
1888 struct inet6_ifaddr *ifpub;
1889 spin_lock_bh(&ifp->lock);
1890 ifpub = ifp->ifpub;
1891 if (ifpub) {
1892 in6_ifa_hold(ifpub);
1893 spin_unlock_bh(&ifp->lock);
1894 ipv6_create_tempaddr(ifpub, ifp);
1895 in6_ifa_put(ifpub);
1896 } else {
1897 spin_unlock_bh(&ifp->lock);
1898 }
1899 ipv6_del_addr(ifp);
1900 } else {
1901 ipv6_del_addr(ifp);
1902 }
1903 }
1904
1905 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1906 {
1907 int err = -ENOENT;
1908
1909 spin_lock_bh(&ifp->lock);
1910 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1911 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1912 err = 0;
1913 }
1914 spin_unlock_bh(&ifp->lock);
1915
1916 return err;
1917 }
1918
1919 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1920 {
1921 struct inet6_dev *idev = ifp->idev;
1922 struct net *net = dev_net(ifp->idev->dev);
1923
1924 if (addrconf_dad_end(ifp)) {
1925 in6_ifa_put(ifp);
1926 return;
1927 }
1928
1929 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1930 ifp->idev->dev->name, &ifp->addr);
1931
1932 spin_lock_bh(&ifp->lock);
1933
1934 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1935 int scope = ifp->scope;
1936 u32 flags = ifp->flags;
1937 struct in6_addr new_addr;
1938 struct inet6_ifaddr *ifp2;
1939 u32 valid_lft, preferred_lft;
1940 int pfxlen = ifp->prefix_len;
1941 int retries = ifp->stable_privacy_retry + 1;
1942
1943 if (retries > net->ipv6.sysctl.idgen_retries) {
1944 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1945 ifp->idev->dev->name);
1946 goto errdad;
1947 }
1948
1949 new_addr = ifp->addr;
1950 if (ipv6_generate_stable_address(&new_addr, retries,
1951 idev))
1952 goto errdad;
1953
1954 valid_lft = ifp->valid_lft;
1955 preferred_lft = ifp->prefered_lft;
1956
1957 spin_unlock_bh(&ifp->lock);
1958
1959 if (idev->cnf.max_addresses &&
1960 ipv6_count_addresses(idev) >=
1961 idev->cnf.max_addresses)
1962 goto lock_errdad;
1963
1964 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1965 ifp->idev->dev->name);
1966
1967 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1968 scope, flags, valid_lft,
1969 preferred_lft);
1970 if (IS_ERR(ifp2))
1971 goto lock_errdad;
1972
1973 spin_lock_bh(&ifp2->lock);
1974 ifp2->stable_privacy_retry = retries;
1975 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1976 spin_unlock_bh(&ifp2->lock);
1977
1978 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1979 in6_ifa_put(ifp2);
1980 lock_errdad:
1981 spin_lock_bh(&ifp->lock);
1982 }
1983
1984 errdad:
1985 /* transition from _POSTDAD to _ERRDAD */
1986 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1987 spin_unlock_bh(&ifp->lock);
1988
1989 addrconf_mod_dad_work(ifp, 0);
1990 in6_ifa_put(ifp);
1991 }
1992
1993 /* Join to solicited addr multicast group.
1994 * caller must hold RTNL */
1995 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1996 {
1997 struct in6_addr maddr;
1998
1999 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2000 return;
2001
2002 addrconf_addr_solict_mult(addr, &maddr);
2003 ipv6_dev_mc_inc(dev, &maddr);
2004 }
2005
2006 /* caller must hold RTNL */
2007 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2008 {
2009 struct in6_addr maddr;
2010
2011 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2012 return;
2013
2014 addrconf_addr_solict_mult(addr, &maddr);
2015 __ipv6_dev_mc_dec(idev, &maddr);
2016 }
2017
2018 /* caller must hold RTNL */
2019 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2020 {
2021 struct in6_addr addr;
2022
2023 if (ifp->prefix_len >= 127) /* RFC 6164 */
2024 return;
2025 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2026 if (ipv6_addr_any(&addr))
2027 return;
2028 __ipv6_dev_ac_inc(ifp->idev, &addr);
2029 }
2030
2031 /* caller must hold RTNL */
2032 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2033 {
2034 struct in6_addr addr;
2035
2036 if (ifp->prefix_len >= 127) /* RFC 6164 */
2037 return;
2038 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2039 if (ipv6_addr_any(&addr))
2040 return;
2041 __ipv6_dev_ac_dec(ifp->idev, &addr);
2042 }
2043
2044 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2045 {
2046 if (dev->addr_len != EUI64_ADDR_LEN)
2047 return -1;
2048 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2049 eui[0] ^= 2;
2050 return 0;
2051 }
2052
2053 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2054 {
2055 union fwnet_hwaddr *ha;
2056
2057 if (dev->addr_len != FWNET_ALEN)
2058 return -1;
2059
2060 ha = (union fwnet_hwaddr *)dev->dev_addr;
2061
2062 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2063 eui[0] ^= 2;
2064 return 0;
2065 }
2066
2067 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2068 {
2069 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2070 if (dev->addr_len != ARCNET_ALEN)
2071 return -1;
2072 memset(eui, 0, 7);
2073 eui[7] = *(u8 *)dev->dev_addr;
2074 return 0;
2075 }
2076
2077 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2078 {
2079 if (dev->addr_len != INFINIBAND_ALEN)
2080 return -1;
2081 memcpy(eui, dev->dev_addr + 12, 8);
2082 eui[0] |= 2;
2083 return 0;
2084 }
2085
2086 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2087 {
2088 if (addr == 0)
2089 return -1;
2090 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2091 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2092 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2093 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2094 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2095 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2096 eui[1] = 0;
2097 eui[2] = 0x5E;
2098 eui[3] = 0xFE;
2099 memcpy(eui + 4, &addr, 4);
2100 return 0;
2101 }
2102
2103 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2104 {
2105 if (dev->priv_flags & IFF_ISATAP)
2106 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2107 return -1;
2108 }
2109
2110 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2111 {
2112 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2113 }
2114
2115 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2116 {
2117 memcpy(eui, dev->perm_addr, 3);
2118 memcpy(eui + 5, dev->perm_addr + 3, 3);
2119 eui[3] = 0xFF;
2120 eui[4] = 0xFE;
2121 eui[0] ^= 2;
2122 return 0;
2123 }
2124
2125 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2126 {
2127 switch (dev->type) {
2128 case ARPHRD_ETHER:
2129 case ARPHRD_FDDI:
2130 return addrconf_ifid_eui48(eui, dev);
2131 case ARPHRD_ARCNET:
2132 return addrconf_ifid_arcnet(eui, dev);
2133 case ARPHRD_INFINIBAND:
2134 return addrconf_ifid_infiniband(eui, dev);
2135 case ARPHRD_SIT:
2136 return addrconf_ifid_sit(eui, dev);
2137 case ARPHRD_IPGRE:
2138 return addrconf_ifid_gre(eui, dev);
2139 case ARPHRD_6LOWPAN:
2140 return addrconf_ifid_eui64(eui, dev);
2141 case ARPHRD_IEEE1394:
2142 return addrconf_ifid_ieee1394(eui, dev);
2143 case ARPHRD_TUNNEL6:
2144 return addrconf_ifid_ip6tnl(eui, dev);
2145 }
2146 return -1;
2147 }
2148
2149 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2150 {
2151 int err = -1;
2152 struct inet6_ifaddr *ifp;
2153
2154 read_lock_bh(&idev->lock);
2155 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2156 if (ifp->scope > IFA_LINK)
2157 break;
2158 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2159 memcpy(eui, ifp->addr.s6_addr+8, 8);
2160 err = 0;
2161 break;
2162 }
2163 }
2164 read_unlock_bh(&idev->lock);
2165 return err;
2166 }
2167
2168 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2169 static void ipv6_regen_rndid(struct inet6_dev *idev)
2170 {
2171 regen:
2172 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2173 idev->rndid[0] &= ~0x02;
2174
2175 /*
2176 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2177 * check if generated address is not inappropriate
2178 *
2179 * - Reserved subnet anycast (RFC 2526)
2180 * 11111101 11....11 1xxxxxxx
2181 * - ISATAP (RFC4214) 6.1
2182 * 00-00-5E-FE-xx-xx-xx-xx
2183 * - value 0
2184 * - XXX: already assigned to an address on the device
2185 */
2186 if (idev->rndid[0] == 0xfd &&
2187 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2188 (idev->rndid[7]&0x80))
2189 goto regen;
2190 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2191 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2192 goto regen;
2193 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2194 goto regen;
2195 }
2196 }
2197
2198 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2199 {
2200 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2201 ipv6_regen_rndid(idev);
2202 }
2203
2204 /*
2205 * Add prefix route.
2206 */
2207
2208 static void
2209 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2210 unsigned long expires, u32 flags)
2211 {
2212 struct fib6_config cfg = {
2213 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2214 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2215 .fc_ifindex = dev->ifindex,
2216 .fc_expires = expires,
2217 .fc_dst_len = plen,
2218 .fc_flags = RTF_UP | flags,
2219 .fc_nlinfo.nl_net = dev_net(dev),
2220 .fc_protocol = RTPROT_KERNEL,
2221 };
2222
2223 cfg.fc_dst = *pfx;
2224
2225 /* Prevent useless cloning on PtP SIT.
2226 This thing is done here expecting that the whole
2227 class of non-broadcast devices need not cloning.
2228 */
2229 #if IS_ENABLED(CONFIG_IPV6_SIT)
2230 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2231 cfg.fc_flags |= RTF_NONEXTHOP;
2232 #endif
2233
2234 ip6_route_add(&cfg);
2235 }
2236
2237
2238 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2239 int plen,
2240 const struct net_device *dev,
2241 u32 flags, u32 noflags)
2242 {
2243 struct fib6_node *fn;
2244 struct rt6_info *rt = NULL;
2245 struct fib6_table *table;
2246 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2247
2248 table = fib6_get_table(dev_net(dev), tb_id);
2249 if (!table)
2250 return NULL;
2251
2252 read_lock_bh(&table->tb6_lock);
2253 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2254 if (!fn)
2255 goto out;
2256
2257 noflags |= RTF_CACHE;
2258 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2259 if (rt->dst.dev->ifindex != dev->ifindex)
2260 continue;
2261 if ((rt->rt6i_flags & flags) != flags)
2262 continue;
2263 if ((rt->rt6i_flags & noflags) != 0)
2264 continue;
2265 dst_hold(&rt->dst);
2266 break;
2267 }
2268 out:
2269 read_unlock_bh(&table->tb6_lock);
2270 return rt;
2271 }
2272
2273
2274 /* Create "default" multicast route to the interface */
2275
2276 static void addrconf_add_mroute(struct net_device *dev)
2277 {
2278 struct fib6_config cfg = {
2279 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2280 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2281 .fc_ifindex = dev->ifindex,
2282 .fc_dst_len = 8,
2283 .fc_flags = RTF_UP,
2284 .fc_nlinfo.nl_net = dev_net(dev),
2285 };
2286
2287 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2288
2289 ip6_route_add(&cfg);
2290 }
2291
2292 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2293 {
2294 struct inet6_dev *idev;
2295
2296 ASSERT_RTNL();
2297
2298 idev = ipv6_find_idev(dev);
2299 if (!idev)
2300 return ERR_PTR(-ENOBUFS);
2301
2302 if (idev->cnf.disable_ipv6)
2303 return ERR_PTR(-EACCES);
2304
2305 /* Add default multicast route */
2306 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2307 addrconf_add_mroute(dev);
2308
2309 return idev;
2310 }
2311
2312 static void manage_tempaddrs(struct inet6_dev *idev,
2313 struct inet6_ifaddr *ifp,
2314 __u32 valid_lft, __u32 prefered_lft,
2315 bool create, unsigned long now)
2316 {
2317 u32 flags;
2318 struct inet6_ifaddr *ift;
2319
2320 read_lock_bh(&idev->lock);
2321 /* update all temporary addresses in the list */
2322 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2323 int age, max_valid, max_prefered;
2324
2325 if (ifp != ift->ifpub)
2326 continue;
2327
2328 /* RFC 4941 section 3.3:
2329 * If a received option will extend the lifetime of a public
2330 * address, the lifetimes of temporary addresses should
2331 * be extended, subject to the overall constraint that no
2332 * temporary addresses should ever remain "valid" or "preferred"
2333 * for a time longer than (TEMP_VALID_LIFETIME) or
2334 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2335 */
2336 age = (now - ift->cstamp) / HZ;
2337 max_valid = idev->cnf.temp_valid_lft - age;
2338 if (max_valid < 0)
2339 max_valid = 0;
2340
2341 max_prefered = idev->cnf.temp_prefered_lft -
2342 idev->desync_factor - age;
2343 if (max_prefered < 0)
2344 max_prefered = 0;
2345
2346 if (valid_lft > max_valid)
2347 valid_lft = max_valid;
2348
2349 if (prefered_lft > max_prefered)
2350 prefered_lft = max_prefered;
2351
2352 spin_lock(&ift->lock);
2353 flags = ift->flags;
2354 ift->valid_lft = valid_lft;
2355 ift->prefered_lft = prefered_lft;
2356 ift->tstamp = now;
2357 if (prefered_lft > 0)
2358 ift->flags &= ~IFA_F_DEPRECATED;
2359
2360 spin_unlock(&ift->lock);
2361 if (!(flags&IFA_F_TENTATIVE))
2362 ipv6_ifa_notify(0, ift);
2363 }
2364
2365 if ((create || list_empty(&idev->tempaddr_list)) &&
2366 idev->cnf.use_tempaddr > 0) {
2367 /* When a new public address is created as described
2368 * in [ADDRCONF], also create a new temporary address.
2369 * Also create a temporary address if it's enabled but
2370 * no temporary address currently exists.
2371 */
2372 read_unlock_bh(&idev->lock);
2373 ipv6_create_tempaddr(ifp, NULL);
2374 } else {
2375 read_unlock_bh(&idev->lock);
2376 }
2377 }
2378
2379 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2380 {
2381 return idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2382 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2383 }
2384
2385 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2386 const struct prefix_info *pinfo,
2387 struct inet6_dev *in6_dev,
2388 const struct in6_addr *addr, int addr_type,
2389 u32 addr_flags, bool sllao, bool tokenized,
2390 __u32 valid_lft, u32 prefered_lft)
2391 {
2392 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2393 int create = 0, update_lft = 0;
2394
2395 if (!ifp && valid_lft) {
2396 int max_addresses = in6_dev->cnf.max_addresses;
2397
2398 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2399 if (in6_dev->cnf.optimistic_dad &&
2400 !net->ipv6.devconf_all->forwarding && sllao)
2401 addr_flags |= IFA_F_OPTIMISTIC;
2402 #endif
2403
2404 /* Do not allow to create too much of autoconfigured
2405 * addresses; this would be too easy way to crash kernel.
2406 */
2407 if (!max_addresses ||
2408 ipv6_count_addresses(in6_dev) < max_addresses)
2409 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2410 pinfo->prefix_len,
2411 addr_type&IPV6_ADDR_SCOPE_MASK,
2412 addr_flags, valid_lft,
2413 prefered_lft);
2414
2415 if (IS_ERR_OR_NULL(ifp))
2416 return -1;
2417
2418 update_lft = 0;
2419 create = 1;
2420 spin_lock_bh(&ifp->lock);
2421 ifp->flags |= IFA_F_MANAGETEMPADDR;
2422 ifp->cstamp = jiffies;
2423 ifp->tokenized = tokenized;
2424 spin_unlock_bh(&ifp->lock);
2425 addrconf_dad_start(ifp);
2426 }
2427
2428 if (ifp) {
2429 u32 flags;
2430 unsigned long now;
2431 u32 stored_lft;
2432
2433 /* update lifetime (RFC2462 5.5.3 e) */
2434 spin_lock_bh(&ifp->lock);
2435 now = jiffies;
2436 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2437 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2438 else
2439 stored_lft = 0;
2440 if (!update_lft && !create && stored_lft) {
2441 const u32 minimum_lft = min_t(u32,
2442 stored_lft, MIN_VALID_LIFETIME);
2443 valid_lft = max(valid_lft, minimum_lft);
2444
2445 /* RFC4862 Section 5.5.3e:
2446 * "Note that the preferred lifetime of the
2447 * corresponding address is always reset to
2448 * the Preferred Lifetime in the received
2449 * Prefix Information option, regardless of
2450 * whether the valid lifetime is also reset or
2451 * ignored."
2452 *
2453 * So we should always update prefered_lft here.
2454 */
2455 update_lft = 1;
2456 }
2457
2458 if (update_lft) {
2459 ifp->valid_lft = valid_lft;
2460 ifp->prefered_lft = prefered_lft;
2461 ifp->tstamp = now;
2462 flags = ifp->flags;
2463 ifp->flags &= ~IFA_F_DEPRECATED;
2464 spin_unlock_bh(&ifp->lock);
2465
2466 if (!(flags&IFA_F_TENTATIVE))
2467 ipv6_ifa_notify(0, ifp);
2468 } else
2469 spin_unlock_bh(&ifp->lock);
2470
2471 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2472 create, now);
2473
2474 in6_ifa_put(ifp);
2475 addrconf_verify();
2476 }
2477
2478 return 0;
2479 }
2480 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2481
2482 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2483 {
2484 struct prefix_info *pinfo;
2485 __u32 valid_lft;
2486 __u32 prefered_lft;
2487 int addr_type, err;
2488 u32 addr_flags = 0;
2489 struct inet6_dev *in6_dev;
2490 struct net *net = dev_net(dev);
2491
2492 pinfo = (struct prefix_info *) opt;
2493
2494 if (len < sizeof(struct prefix_info)) {
2495 ADBG("addrconf: prefix option too short\n");
2496 return;
2497 }
2498
2499 /*
2500 * Validation checks ([ADDRCONF], page 19)
2501 */
2502
2503 addr_type = ipv6_addr_type(&pinfo->prefix);
2504
2505 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2506 return;
2507
2508 valid_lft = ntohl(pinfo->valid);
2509 prefered_lft = ntohl(pinfo->prefered);
2510
2511 if (prefered_lft > valid_lft) {
2512 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2513 return;
2514 }
2515
2516 in6_dev = in6_dev_get(dev);
2517
2518 if (!in6_dev) {
2519 net_dbg_ratelimited("addrconf: device %s not configured\n",
2520 dev->name);
2521 return;
2522 }
2523
2524 /*
2525 * Two things going on here:
2526 * 1) Add routes for on-link prefixes
2527 * 2) Configure prefixes with the auto flag set
2528 */
2529
2530 if (pinfo->onlink) {
2531 struct rt6_info *rt;
2532 unsigned long rt_expires;
2533
2534 /* Avoid arithmetic overflow. Really, we could
2535 * save rt_expires in seconds, likely valid_lft,
2536 * but it would require division in fib gc, that it
2537 * not good.
2538 */
2539 if (HZ > USER_HZ)
2540 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2541 else
2542 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2543
2544 if (addrconf_finite_timeout(rt_expires))
2545 rt_expires *= HZ;
2546
2547 rt = addrconf_get_prefix_route(&pinfo->prefix,
2548 pinfo->prefix_len,
2549 dev,
2550 RTF_ADDRCONF | RTF_PREFIX_RT,
2551 RTF_GATEWAY | RTF_DEFAULT);
2552
2553 if (rt) {
2554 /* Autoconf prefix route */
2555 if (valid_lft == 0) {
2556 ip6_del_rt(rt);
2557 rt = NULL;
2558 } else if (addrconf_finite_timeout(rt_expires)) {
2559 /* not infinity */
2560 rt6_set_expires(rt, jiffies + rt_expires);
2561 } else {
2562 rt6_clean_expires(rt);
2563 }
2564 } else if (valid_lft) {
2565 clock_t expires = 0;
2566 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2567 if (addrconf_finite_timeout(rt_expires)) {
2568 /* not infinity */
2569 flags |= RTF_EXPIRES;
2570 expires = jiffies_to_clock_t(rt_expires);
2571 }
2572 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2573 dev, expires, flags);
2574 }
2575 ip6_rt_put(rt);
2576 }
2577
2578 /* Try to figure out our local address for this prefix */
2579
2580 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2581 struct in6_addr addr;
2582 bool tokenized = false, dev_addr_generated = false;
2583
2584 if (pinfo->prefix_len == 64) {
2585 memcpy(&addr, &pinfo->prefix, 8);
2586
2587 if (!ipv6_addr_any(&in6_dev->token)) {
2588 read_lock_bh(&in6_dev->lock);
2589 memcpy(addr.s6_addr + 8,
2590 in6_dev->token.s6_addr + 8, 8);
2591 read_unlock_bh(&in6_dev->lock);
2592 tokenized = true;
2593 } else if (is_addr_mode_generate_stable(in6_dev) &&
2594 !ipv6_generate_stable_address(&addr, 0,
2595 in6_dev)) {
2596 addr_flags |= IFA_F_STABLE_PRIVACY;
2597 goto ok;
2598 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2599 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2600 goto put;
2601 } else {
2602 dev_addr_generated = true;
2603 }
2604 goto ok;
2605 }
2606 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2607 pinfo->prefix_len);
2608 goto put;
2609
2610 ok:
2611 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2612 &addr, addr_type,
2613 addr_flags, sllao,
2614 tokenized, valid_lft,
2615 prefered_lft);
2616 if (err)
2617 goto put;
2618
2619 /* Ignore error case here because previous prefix add addr was
2620 * successful which will be notified.
2621 */
2622 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2623 addr_type, addr_flags, sllao,
2624 tokenized, valid_lft,
2625 prefered_lft,
2626 dev_addr_generated);
2627 }
2628 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2629 put:
2630 in6_dev_put(in6_dev);
2631 }
2632
2633 /*
2634 * Set destination address.
2635 * Special case for SIT interfaces where we create a new "virtual"
2636 * device.
2637 */
2638 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2639 {
2640 struct in6_ifreq ireq;
2641 struct net_device *dev;
2642 int err = -EINVAL;
2643
2644 rtnl_lock();
2645
2646 err = -EFAULT;
2647 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2648 goto err_exit;
2649
2650 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2651
2652 err = -ENODEV;
2653 if (!dev)
2654 goto err_exit;
2655
2656 #if IS_ENABLED(CONFIG_IPV6_SIT)
2657 if (dev->type == ARPHRD_SIT) {
2658 const struct net_device_ops *ops = dev->netdev_ops;
2659 struct ifreq ifr;
2660 struct ip_tunnel_parm p;
2661
2662 err = -EADDRNOTAVAIL;
2663 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2664 goto err_exit;
2665
2666 memset(&p, 0, sizeof(p));
2667 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2668 p.iph.saddr = 0;
2669 p.iph.version = 4;
2670 p.iph.ihl = 5;
2671 p.iph.protocol = IPPROTO_IPV6;
2672 p.iph.ttl = 64;
2673 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2674
2675 if (ops->ndo_do_ioctl) {
2676 mm_segment_t oldfs = get_fs();
2677
2678 set_fs(KERNEL_DS);
2679 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2680 set_fs(oldfs);
2681 } else
2682 err = -EOPNOTSUPP;
2683
2684 if (err == 0) {
2685 err = -ENOBUFS;
2686 dev = __dev_get_by_name(net, p.name);
2687 if (!dev)
2688 goto err_exit;
2689 err = dev_open(dev);
2690 }
2691 }
2692 #endif
2693
2694 err_exit:
2695 rtnl_unlock();
2696 return err;
2697 }
2698
2699 static int ipv6_mc_config(struct sock *sk, bool join,
2700 const struct in6_addr *addr, int ifindex)
2701 {
2702 int ret;
2703
2704 ASSERT_RTNL();
2705
2706 lock_sock(sk);
2707 if (join)
2708 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2709 else
2710 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2711 release_sock(sk);
2712
2713 return ret;
2714 }
2715
2716 /*
2717 * Manual configuration of address on an interface
2718 */
2719 static int inet6_addr_add(struct net *net, int ifindex,
2720 const struct in6_addr *pfx,
2721 const struct in6_addr *peer_pfx,
2722 unsigned int plen, __u32 ifa_flags,
2723 __u32 prefered_lft, __u32 valid_lft)
2724 {
2725 struct inet6_ifaddr *ifp;
2726 struct inet6_dev *idev;
2727 struct net_device *dev;
2728 unsigned long timeout;
2729 clock_t expires;
2730 int scope;
2731 u32 flags;
2732
2733 ASSERT_RTNL();
2734
2735 if (plen > 128)
2736 return -EINVAL;
2737
2738 /* check the lifetime */
2739 if (!valid_lft || prefered_lft > valid_lft)
2740 return -EINVAL;
2741
2742 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2743 return -EINVAL;
2744
2745 dev = __dev_get_by_index(net, ifindex);
2746 if (!dev)
2747 return -ENODEV;
2748
2749 idev = addrconf_add_dev(dev);
2750 if (IS_ERR(idev))
2751 return PTR_ERR(idev);
2752
2753 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2754 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2755 true, pfx, ifindex);
2756
2757 if (ret < 0)
2758 return ret;
2759 }
2760
2761 scope = ipv6_addr_scope(pfx);
2762
2763 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2764 if (addrconf_finite_timeout(timeout)) {
2765 expires = jiffies_to_clock_t(timeout * HZ);
2766 valid_lft = timeout;
2767 flags = RTF_EXPIRES;
2768 } else {
2769 expires = 0;
2770 flags = 0;
2771 ifa_flags |= IFA_F_PERMANENT;
2772 }
2773
2774 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2775 if (addrconf_finite_timeout(timeout)) {
2776 if (timeout == 0)
2777 ifa_flags |= IFA_F_DEPRECATED;
2778 prefered_lft = timeout;
2779 }
2780
2781 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2782 valid_lft, prefered_lft);
2783
2784 if (!IS_ERR(ifp)) {
2785 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2786 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2787 expires, flags);
2788 }
2789
2790 /*
2791 * Note that section 3.1 of RFC 4429 indicates
2792 * that the Optimistic flag should not be set for
2793 * manually configured addresses
2794 */
2795 addrconf_dad_start(ifp);
2796 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2797 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2798 true, jiffies);
2799 in6_ifa_put(ifp);
2800 addrconf_verify_rtnl();
2801 return 0;
2802 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2803 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2804 false, pfx, ifindex);
2805 }
2806
2807 return PTR_ERR(ifp);
2808 }
2809
2810 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2811 const struct in6_addr *pfx, unsigned int plen)
2812 {
2813 struct inet6_ifaddr *ifp;
2814 struct inet6_dev *idev;
2815 struct net_device *dev;
2816
2817 if (plen > 128)
2818 return -EINVAL;
2819
2820 dev = __dev_get_by_index(net, ifindex);
2821 if (!dev)
2822 return -ENODEV;
2823
2824 idev = __in6_dev_get(dev);
2825 if (!idev)
2826 return -ENXIO;
2827
2828 read_lock_bh(&idev->lock);
2829 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2830 if (ifp->prefix_len == plen &&
2831 ipv6_addr_equal(pfx, &ifp->addr)) {
2832 in6_ifa_hold(ifp);
2833 read_unlock_bh(&idev->lock);
2834
2835 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2836 (ifa_flags & IFA_F_MANAGETEMPADDR))
2837 manage_tempaddrs(idev, ifp, 0, 0, false,
2838 jiffies);
2839 ipv6_del_addr(ifp);
2840 addrconf_verify_rtnl();
2841 if (ipv6_addr_is_multicast(pfx)) {
2842 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2843 false, pfx, dev->ifindex);
2844 }
2845 return 0;
2846 }
2847 }
2848 read_unlock_bh(&idev->lock);
2849 return -EADDRNOTAVAIL;
2850 }
2851
2852
2853 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2854 {
2855 struct in6_ifreq ireq;
2856 int err;
2857
2858 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2859 return -EPERM;
2860
2861 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2862 return -EFAULT;
2863
2864 rtnl_lock();
2865 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2866 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2867 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2868 rtnl_unlock();
2869 return err;
2870 }
2871
2872 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2873 {
2874 struct in6_ifreq ireq;
2875 int err;
2876
2877 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2878 return -EPERM;
2879
2880 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2881 return -EFAULT;
2882
2883 rtnl_lock();
2884 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2885 ireq.ifr6_prefixlen);
2886 rtnl_unlock();
2887 return err;
2888 }
2889
2890 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2891 int plen, int scope)
2892 {
2893 struct inet6_ifaddr *ifp;
2894
2895 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2896 scope, IFA_F_PERMANENT,
2897 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2898 if (!IS_ERR(ifp)) {
2899 spin_lock_bh(&ifp->lock);
2900 ifp->flags &= ~IFA_F_TENTATIVE;
2901 spin_unlock_bh(&ifp->lock);
2902 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2903 in6_ifa_put(ifp);
2904 }
2905 }
2906
2907 #if IS_ENABLED(CONFIG_IPV6_SIT)
2908 static void sit_add_v4_addrs(struct inet6_dev *idev)
2909 {
2910 struct in6_addr addr;
2911 struct net_device *dev;
2912 struct net *net = dev_net(idev->dev);
2913 int scope, plen;
2914 u32 pflags = 0;
2915
2916 ASSERT_RTNL();
2917
2918 memset(&addr, 0, sizeof(struct in6_addr));
2919 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2920
2921 if (idev->dev->flags&IFF_POINTOPOINT) {
2922 addr.s6_addr32[0] = htonl(0xfe800000);
2923 scope = IFA_LINK;
2924 plen = 64;
2925 } else {
2926 scope = IPV6_ADDR_COMPATv4;
2927 plen = 96;
2928 pflags |= RTF_NONEXTHOP;
2929 }
2930
2931 if (addr.s6_addr32[3]) {
2932 add_addr(idev, &addr, plen, scope);
2933 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2934 return;
2935 }
2936
2937 for_each_netdev(net, dev) {
2938 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2939 if (in_dev && (dev->flags & IFF_UP)) {
2940 struct in_ifaddr *ifa;
2941
2942 int flag = scope;
2943
2944 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2945
2946 addr.s6_addr32[3] = ifa->ifa_local;
2947
2948 if (ifa->ifa_scope == RT_SCOPE_LINK)
2949 continue;
2950 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2951 if (idev->dev->flags&IFF_POINTOPOINT)
2952 continue;
2953 flag |= IFA_HOST;
2954 }
2955
2956 add_addr(idev, &addr, plen, flag);
2957 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2958 pflags);
2959 }
2960 }
2961 }
2962 }
2963 #endif
2964
2965 static void init_loopback(struct net_device *dev)
2966 {
2967 struct inet6_dev *idev;
2968 struct net_device *sp_dev;
2969 struct inet6_ifaddr *sp_ifa;
2970 struct rt6_info *sp_rt;
2971
2972 /* ::1 */
2973
2974 ASSERT_RTNL();
2975
2976 idev = ipv6_find_idev(dev);
2977 if (!idev) {
2978 pr_debug("%s: add_dev failed\n", __func__);
2979 return;
2980 }
2981
2982 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2983
2984 /* Add routes to other interface's IPv6 addresses */
2985 for_each_netdev(dev_net(dev), sp_dev) {
2986 if (!strcmp(sp_dev->name, dev->name))
2987 continue;
2988
2989 idev = __in6_dev_get(sp_dev);
2990 if (!idev)
2991 continue;
2992
2993 read_lock_bh(&idev->lock);
2994 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2995
2996 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2997 continue;
2998
2999 if (sp_ifa->rt) {
3000 /* This dst has been added to garbage list when
3001 * lo device down, release this obsolete dst and
3002 * reallocate a new router for ifa.
3003 */
3004 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
3005 ip6_rt_put(sp_ifa->rt);
3006 sp_ifa->rt = NULL;
3007 } else {
3008 continue;
3009 }
3010 }
3011
3012 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3013
3014 /* Failure cases are ignored */
3015 if (!IS_ERR(sp_rt)) {
3016 sp_ifa->rt = sp_rt;
3017 ip6_ins_rt(sp_rt);
3018 }
3019 }
3020 read_unlock_bh(&idev->lock);
3021 }
3022 }
3023
3024 void addrconf_add_linklocal(struct inet6_dev *idev,
3025 const struct in6_addr *addr, u32 flags)
3026 {
3027 struct inet6_ifaddr *ifp;
3028 u32 addr_flags = flags | IFA_F_PERMANENT;
3029
3030 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3031 if (idev->cnf.optimistic_dad &&
3032 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3033 addr_flags |= IFA_F_OPTIMISTIC;
3034 #endif
3035
3036 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3037 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3038 if (!IS_ERR(ifp)) {
3039 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3040 addrconf_dad_start(ifp);
3041 in6_ifa_put(ifp);
3042 }
3043 }
3044 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3045
3046 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3047 {
3048 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3049 return true;
3050
3051 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3052 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3053 return true;
3054
3055 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3056 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3057 return true;
3058
3059 return false;
3060 }
3061
3062 static int ipv6_generate_stable_address(struct in6_addr *address,
3063 u8 dad_count,
3064 const struct inet6_dev *idev)
3065 {
3066 static DEFINE_SPINLOCK(lock);
3067 static __u32 digest[SHA_DIGEST_WORDS];
3068 static __u32 workspace[SHA_WORKSPACE_WORDS];
3069
3070 static union {
3071 char __data[SHA_MESSAGE_BYTES];
3072 struct {
3073 struct in6_addr secret;
3074 __be32 prefix[2];
3075 unsigned char hwaddr[MAX_ADDR_LEN];
3076 u8 dad_count;
3077 } __packed;
3078 } data;
3079
3080 struct in6_addr secret;
3081 struct in6_addr temp;
3082 struct net *net = dev_net(idev->dev);
3083
3084 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3085
3086 if (idev->cnf.stable_secret.initialized)
3087 secret = idev->cnf.stable_secret.secret;
3088 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3089 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3090 else
3091 return -1;
3092
3093 retry:
3094 spin_lock_bh(&lock);
3095
3096 sha_init(digest);
3097 memset(&data, 0, sizeof(data));
3098 memset(workspace, 0, sizeof(workspace));
3099 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3100 data.prefix[0] = address->s6_addr32[0];
3101 data.prefix[1] = address->s6_addr32[1];
3102 data.secret = secret;
3103 data.dad_count = dad_count;
3104
3105 sha_transform(digest, data.__data, workspace);
3106
3107 temp = *address;
3108 temp.s6_addr32[2] = (__force __be32)digest[0];
3109 temp.s6_addr32[3] = (__force __be32)digest[1];
3110
3111 spin_unlock_bh(&lock);
3112
3113 if (ipv6_reserved_interfaceid(temp)) {
3114 dad_count++;
3115 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3116 return -1;
3117 goto retry;
3118 }
3119
3120 *address = temp;
3121 return 0;
3122 }
3123
3124 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3125 {
3126 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3127
3128 if (s->initialized)
3129 return;
3130 s = &idev->cnf.stable_secret;
3131 get_random_bytes(&s->secret, sizeof(s->secret));
3132 s->initialized = true;
3133 }
3134
3135 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3136 {
3137 struct in6_addr addr;
3138
3139 /* no link local addresses on L3 master devices */
3140 if (netif_is_l3_master(idev->dev))
3141 return;
3142
3143 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3144
3145 switch (idev->addr_gen_mode) {
3146 case IN6_ADDR_GEN_MODE_RANDOM:
3147 ipv6_gen_mode_random_init(idev);
3148 /* fallthrough */
3149 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3150 if (!ipv6_generate_stable_address(&addr, 0, idev))
3151 addrconf_add_linklocal(idev, &addr,
3152 IFA_F_STABLE_PRIVACY);
3153 else if (prefix_route)
3154 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3155 break;
3156 case IN6_ADDR_GEN_MODE_EUI64:
3157 /* addrconf_add_linklocal also adds a prefix_route and we
3158 * only need to care about prefix routes if ipv6_generate_eui64
3159 * couldn't generate one.
3160 */
3161 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3162 addrconf_add_linklocal(idev, &addr, 0);
3163 else if (prefix_route)
3164 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3165 break;
3166 case IN6_ADDR_GEN_MODE_NONE:
3167 default:
3168 /* will not add any link local address */
3169 break;
3170 }
3171 }
3172
3173 static void addrconf_dev_config(struct net_device *dev)
3174 {
3175 struct inet6_dev *idev;
3176
3177 ASSERT_RTNL();
3178
3179 if ((dev->type != ARPHRD_ETHER) &&
3180 (dev->type != ARPHRD_FDDI) &&
3181 (dev->type != ARPHRD_ARCNET) &&
3182 (dev->type != ARPHRD_INFINIBAND) &&
3183 (dev->type != ARPHRD_IEEE1394) &&
3184 (dev->type != ARPHRD_TUNNEL6) &&
3185 (dev->type != ARPHRD_6LOWPAN) &&
3186 (dev->type != ARPHRD_NONE)) {
3187 /* Alas, we support only Ethernet autoconfiguration. */
3188 return;
3189 }
3190
3191 idev = addrconf_add_dev(dev);
3192 if (IS_ERR(idev))
3193 return;
3194
3195 /* this device type has no EUI support */
3196 if (dev->type == ARPHRD_NONE &&
3197 idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3198 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3199
3200 addrconf_addr_gen(idev, false);
3201 }
3202
3203 #if IS_ENABLED(CONFIG_IPV6_SIT)
3204 static void addrconf_sit_config(struct net_device *dev)
3205 {
3206 struct inet6_dev *idev;
3207
3208 ASSERT_RTNL();
3209
3210 /*
3211 * Configure the tunnel with one of our IPv4
3212 * addresses... we should configure all of
3213 * our v4 addrs in the tunnel
3214 */
3215
3216 idev = ipv6_find_idev(dev);
3217 if (!idev) {
3218 pr_debug("%s: add_dev failed\n", __func__);
3219 return;
3220 }
3221
3222 if (dev->priv_flags & IFF_ISATAP) {
3223 addrconf_addr_gen(idev, false);
3224 return;
3225 }
3226
3227 sit_add_v4_addrs(idev);
3228
3229 if (dev->flags&IFF_POINTOPOINT)
3230 addrconf_add_mroute(dev);
3231 }
3232 #endif
3233
3234 #if IS_ENABLED(CONFIG_NET_IPGRE)
3235 static void addrconf_gre_config(struct net_device *dev)
3236 {
3237 struct inet6_dev *idev;
3238
3239 ASSERT_RTNL();
3240
3241 idev = ipv6_find_idev(dev);
3242 if (!idev) {
3243 pr_debug("%s: add_dev failed\n", __func__);
3244 return;
3245 }
3246
3247 addrconf_addr_gen(idev, true);
3248 if (dev->flags & IFF_POINTOPOINT)
3249 addrconf_add_mroute(dev);
3250 }
3251 #endif
3252
3253 static int fixup_permanent_addr(struct inet6_dev *idev,
3254 struct inet6_ifaddr *ifp)
3255 {
3256 if (!ifp->rt) {
3257 struct rt6_info *rt;
3258
3259 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3260 if (unlikely(IS_ERR(rt)))
3261 return PTR_ERR(rt);
3262
3263 ifp->rt = rt;
3264 }
3265
3266 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3267 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3268 idev->dev, 0, 0);
3269 }
3270
3271 addrconf_dad_start(ifp);
3272
3273 return 0;
3274 }
3275
3276 static void addrconf_permanent_addr(struct net_device *dev)
3277 {
3278 struct inet6_ifaddr *ifp, *tmp;
3279 struct inet6_dev *idev;
3280
3281 idev = __in6_dev_get(dev);
3282 if (!idev)
3283 return;
3284
3285 write_lock_bh(&idev->lock);
3286
3287 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3288 if ((ifp->flags & IFA_F_PERMANENT) &&
3289 fixup_permanent_addr(idev, ifp) < 0) {
3290 write_unlock_bh(&idev->lock);
3291 ipv6_del_addr(ifp);
3292 write_lock_bh(&idev->lock);
3293
3294 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3295 idev->dev->name, &ifp->addr);
3296 }
3297 }
3298
3299 write_unlock_bh(&idev->lock);
3300 }
3301
3302 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3303 void *ptr)
3304 {
3305 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3306 struct netdev_notifier_changeupper_info *info;
3307 struct inet6_dev *idev = __in6_dev_get(dev);
3308 int run_pending = 0;
3309 int err;
3310
3311 switch (event) {
3312 case NETDEV_REGISTER:
3313 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3314 idev = ipv6_add_dev(dev);
3315 if (IS_ERR(idev))
3316 return notifier_from_errno(PTR_ERR(idev));
3317 }
3318 break;
3319
3320 case NETDEV_CHANGEMTU:
3321 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3322 if (dev->mtu < IPV6_MIN_MTU) {
3323 addrconf_ifdown(dev, 1);
3324 break;
3325 }
3326
3327 if (idev) {
3328 rt6_mtu_change(dev, dev->mtu);
3329 idev->cnf.mtu6 = dev->mtu;
3330 break;
3331 }
3332
3333 /* allocate new idev */
3334 idev = ipv6_add_dev(dev);
3335 if (IS_ERR(idev))
3336 break;
3337
3338 /* device is still not ready */
3339 if (!(idev->if_flags & IF_READY))
3340 break;
3341
3342 run_pending = 1;
3343
3344 /* fall through */
3345
3346 case NETDEV_UP:
3347 case NETDEV_CHANGE:
3348 if (dev->flags & IFF_SLAVE)
3349 break;
3350
3351 if (idev && idev->cnf.disable_ipv6)
3352 break;
3353
3354 if (event == NETDEV_UP) {
3355 /* restore routes for permanent addresses */
3356 addrconf_permanent_addr(dev);
3357
3358 if (!addrconf_qdisc_ok(dev)) {
3359 /* device is not ready yet. */
3360 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3361 dev->name);
3362 break;
3363 }
3364
3365 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3366 idev = ipv6_add_dev(dev);
3367
3368 if (!IS_ERR_OR_NULL(idev)) {
3369 idev->if_flags |= IF_READY;
3370 run_pending = 1;
3371 }
3372 } else if (event == NETDEV_CHANGE) {
3373 if (!addrconf_qdisc_ok(dev)) {
3374 /* device is still not ready. */
3375 break;
3376 }
3377
3378 if (idev) {
3379 if (idev->if_flags & IF_READY)
3380 /* device is already configured. */
3381 break;
3382 idev->if_flags |= IF_READY;
3383 }
3384
3385 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3386 dev->name);
3387
3388 run_pending = 1;
3389 }
3390
3391 switch (dev->type) {
3392 #if IS_ENABLED(CONFIG_IPV6_SIT)
3393 case ARPHRD_SIT:
3394 addrconf_sit_config(dev);
3395 break;
3396 #endif
3397 #if IS_ENABLED(CONFIG_NET_IPGRE)
3398 case ARPHRD_IPGRE:
3399 addrconf_gre_config(dev);
3400 break;
3401 #endif
3402 case ARPHRD_LOOPBACK:
3403 init_loopback(dev);
3404 break;
3405
3406 default:
3407 addrconf_dev_config(dev);
3408 break;
3409 }
3410
3411 if (!IS_ERR_OR_NULL(idev)) {
3412 if (run_pending)
3413 addrconf_dad_run(idev);
3414
3415 /*
3416 * If the MTU changed during the interface down,
3417 * when the interface up, the changed MTU must be
3418 * reflected in the idev as well as routers.
3419 */
3420 if (idev->cnf.mtu6 != dev->mtu &&
3421 dev->mtu >= IPV6_MIN_MTU) {
3422 rt6_mtu_change(dev, dev->mtu);
3423 idev->cnf.mtu6 = dev->mtu;
3424 }
3425 idev->tstamp = jiffies;
3426 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3427
3428 /*
3429 * If the changed mtu during down is lower than
3430 * IPV6_MIN_MTU stop IPv6 on this interface.
3431 */
3432 if (dev->mtu < IPV6_MIN_MTU)
3433 addrconf_ifdown(dev, 1);
3434 }
3435 break;
3436
3437 case NETDEV_DOWN:
3438 case NETDEV_UNREGISTER:
3439 /*
3440 * Remove all addresses from this interface.
3441 */
3442 addrconf_ifdown(dev, event != NETDEV_DOWN);
3443 break;
3444
3445 case NETDEV_CHANGENAME:
3446 if (idev) {
3447 snmp6_unregister_dev(idev);
3448 addrconf_sysctl_unregister(idev);
3449 err = addrconf_sysctl_register(idev);
3450 if (err)
3451 return notifier_from_errno(err);
3452 err = snmp6_register_dev(idev);
3453 if (err) {
3454 addrconf_sysctl_unregister(idev);
3455 return notifier_from_errno(err);
3456 }
3457 }
3458 break;
3459
3460 case NETDEV_PRE_TYPE_CHANGE:
3461 case NETDEV_POST_TYPE_CHANGE:
3462 if (idev)
3463 addrconf_type_change(dev, event);
3464 break;
3465
3466 case NETDEV_CHANGEUPPER:
3467 info = ptr;
3468
3469 /* flush all routes if dev is linked to or unlinked from
3470 * an L3 master device (e.g., VRF)
3471 */
3472 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3473 addrconf_ifdown(dev, 0);
3474 }
3475
3476 return NOTIFY_OK;
3477 }
3478
3479 /*
3480 * addrconf module should be notified of a device going up
3481 */
3482 static struct notifier_block ipv6_dev_notf = {
3483 .notifier_call = addrconf_notify,
3484 };
3485
3486 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3487 {
3488 struct inet6_dev *idev;
3489 ASSERT_RTNL();
3490
3491 idev = __in6_dev_get(dev);
3492
3493 if (event == NETDEV_POST_TYPE_CHANGE)
3494 ipv6_mc_remap(idev);
3495 else if (event == NETDEV_PRE_TYPE_CHANGE)
3496 ipv6_mc_unmap(idev);
3497 }
3498
3499 static bool addr_is_local(const struct in6_addr *addr)
3500 {
3501 return ipv6_addr_type(addr) &
3502 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3503 }
3504
3505 static int addrconf_ifdown(struct net_device *dev, int how)
3506 {
3507 struct net *net = dev_net(dev);
3508 struct inet6_dev *idev;
3509 struct inet6_ifaddr *ifa, *tmp;
3510 struct list_head del_list;
3511 int _keep_addr;
3512 bool keep_addr;
3513 int state, i;
3514
3515 ASSERT_RTNL();
3516
3517 rt6_ifdown(net, dev);
3518 neigh_ifdown(&nd_tbl, dev);
3519
3520 idev = __in6_dev_get(dev);
3521 if (!idev)
3522 return -ENODEV;
3523
3524 /*
3525 * Step 1: remove reference to ipv6 device from parent device.
3526 * Do not dev_put!
3527 */
3528 if (how) {
3529 idev->dead = 1;
3530
3531 /* protected by rtnl_lock */
3532 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3533
3534 /* Step 1.5: remove snmp6 entry */
3535 snmp6_unregister_dev(idev);
3536
3537 }
3538
3539 /* aggregate the system setting and interface setting */
3540 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3541 if (!_keep_addr)
3542 _keep_addr = idev->cnf.keep_addr_on_down;
3543
3544 /* combine the user config with event to determine if permanent
3545 * addresses are to be removed from address hash table
3546 */
3547 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3548
3549 /* Step 2: clear hash table */
3550 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3551 struct hlist_head *h = &inet6_addr_lst[i];
3552
3553 spin_lock_bh(&addrconf_hash_lock);
3554 restart:
3555 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3556 if (ifa->idev == idev) {
3557 addrconf_del_dad_work(ifa);
3558 /* combined flag + permanent flag decide if
3559 * address is retained on a down event
3560 */
3561 if (!keep_addr ||
3562 !(ifa->flags & IFA_F_PERMANENT) ||
3563 addr_is_local(&ifa->addr)) {
3564 hlist_del_init_rcu(&ifa->addr_lst);
3565 goto restart;
3566 }
3567 }
3568 }
3569 spin_unlock_bh(&addrconf_hash_lock);
3570 }
3571
3572 write_lock_bh(&idev->lock);
3573
3574 addrconf_del_rs_timer(idev);
3575
3576 /* Step 2: clear flags for stateless addrconf */
3577 if (!how)
3578 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3579
3580 /* Step 3: clear tempaddr list */
3581 while (!list_empty(&idev->tempaddr_list)) {
3582 ifa = list_first_entry(&idev->tempaddr_list,
3583 struct inet6_ifaddr, tmp_list);
3584 list_del(&ifa->tmp_list);
3585 write_unlock_bh(&idev->lock);
3586 spin_lock_bh(&ifa->lock);
3587
3588 if (ifa->ifpub) {
3589 in6_ifa_put(ifa->ifpub);
3590 ifa->ifpub = NULL;
3591 }
3592 spin_unlock_bh(&ifa->lock);
3593 in6_ifa_put(ifa);
3594 write_lock_bh(&idev->lock);
3595 }
3596
3597 /* re-combine the user config with event to determine if permanent
3598 * addresses are to be removed from the interface list
3599 */
3600 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3601
3602 INIT_LIST_HEAD(&del_list);
3603 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3604 struct rt6_info *rt = NULL;
3605
3606 addrconf_del_dad_work(ifa);
3607
3608 write_unlock_bh(&idev->lock);
3609 spin_lock_bh(&ifa->lock);
3610
3611 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3612 !addr_is_local(&ifa->addr)) {
3613 /* set state to skip the notifier below */
3614 state = INET6_IFADDR_STATE_DEAD;
3615 ifa->state = 0;
3616 if (!(ifa->flags & IFA_F_NODAD))
3617 ifa->flags |= IFA_F_TENTATIVE;
3618
3619 rt = ifa->rt;
3620 ifa->rt = NULL;
3621 } else {
3622 state = ifa->state;
3623 ifa->state = INET6_IFADDR_STATE_DEAD;
3624
3625 list_move(&ifa->if_list, &del_list);
3626 }
3627
3628 spin_unlock_bh(&ifa->lock);
3629
3630 if (rt)
3631 ip6_del_rt(rt);
3632
3633 if (state != INET6_IFADDR_STATE_DEAD) {
3634 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3635 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3636 } else {
3637 if (idev->cnf.forwarding)
3638 addrconf_leave_anycast(ifa);
3639 addrconf_leave_solict(ifa->idev, &ifa->addr);
3640 }
3641
3642 write_lock_bh(&idev->lock);
3643 }
3644
3645 write_unlock_bh(&idev->lock);
3646
3647 /* now clean up addresses to be removed */
3648 while (!list_empty(&del_list)) {
3649 ifa = list_first_entry(&del_list,
3650 struct inet6_ifaddr, if_list);
3651 list_del(&ifa->if_list);
3652
3653 in6_ifa_put(ifa);
3654 }
3655
3656 /* Step 5: Discard anycast and multicast list */
3657 if (how) {
3658 ipv6_ac_destroy_dev(idev);
3659 ipv6_mc_destroy_dev(idev);
3660 } else {
3661 ipv6_mc_down(idev);
3662 }
3663
3664 idev->tstamp = jiffies;
3665
3666 /* Last: Shot the device (if unregistered) */
3667 if (how) {
3668 addrconf_sysctl_unregister(idev);
3669 neigh_parms_release(&nd_tbl, idev->nd_parms);
3670 neigh_ifdown(&nd_tbl, dev);
3671 in6_dev_put(idev);
3672 }
3673 return 0;
3674 }
3675
3676 static void addrconf_rs_timer(unsigned long data)
3677 {
3678 struct inet6_dev *idev = (struct inet6_dev *)data;
3679 struct net_device *dev = idev->dev;
3680 struct in6_addr lladdr;
3681
3682 write_lock(&idev->lock);
3683 if (idev->dead || !(idev->if_flags & IF_READY))
3684 goto out;
3685
3686 if (!ipv6_accept_ra(idev))
3687 goto out;
3688
3689 /* Announcement received after solicitation was sent */
3690 if (idev->if_flags & IF_RA_RCVD)
3691 goto out;
3692
3693 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3694 write_unlock(&idev->lock);
3695 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3696 ndisc_send_rs(dev, &lladdr,
3697 &in6addr_linklocal_allrouters);
3698 else
3699 goto put;
3700
3701 write_lock(&idev->lock);
3702 idev->rs_interval = rfc3315_s14_backoff_update(
3703 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3704 /* The wait after the last probe can be shorter */
3705 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3706 idev->cnf.rtr_solicits) ?
3707 idev->cnf.rtr_solicit_delay :
3708 idev->rs_interval);
3709 } else {
3710 /*
3711 * Note: we do not support deprecated "all on-link"
3712 * assumption any longer.
3713 */
3714 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3715 }
3716
3717 out:
3718 write_unlock(&idev->lock);
3719 put:
3720 in6_dev_put(idev);
3721 }
3722
3723 /*
3724 * Duplicate Address Detection
3725 */
3726 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3727 {
3728 unsigned long rand_num;
3729 struct inet6_dev *idev = ifp->idev;
3730
3731 if (ifp->flags & IFA_F_OPTIMISTIC)
3732 rand_num = 0;
3733 else
3734 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3735
3736 ifp->dad_probes = idev->cnf.dad_transmits;
3737 addrconf_mod_dad_work(ifp, rand_num);
3738 }
3739
3740 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3741 {
3742 struct inet6_dev *idev = ifp->idev;
3743 struct net_device *dev = idev->dev;
3744 bool notify = false;
3745
3746 addrconf_join_solict(dev, &ifp->addr);
3747
3748 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3749
3750 read_lock_bh(&idev->lock);
3751 spin_lock(&ifp->lock);
3752 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3753 goto out;
3754
3755 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3756 idev->cnf.accept_dad < 1 ||
3757 !(ifp->flags&IFA_F_TENTATIVE) ||
3758 ifp->flags & IFA_F_NODAD) {
3759 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3760 spin_unlock(&ifp->lock);
3761 read_unlock_bh(&idev->lock);
3762
3763 addrconf_dad_completed(ifp);
3764 return;
3765 }
3766
3767 if (!(idev->if_flags & IF_READY)) {
3768 spin_unlock(&ifp->lock);
3769 read_unlock_bh(&idev->lock);
3770 /*
3771 * If the device is not ready:
3772 * - keep it tentative if it is a permanent address.
3773 * - otherwise, kill it.
3774 */
3775 in6_ifa_hold(ifp);
3776 addrconf_dad_stop(ifp, 0);
3777 return;
3778 }
3779
3780 /*
3781 * Optimistic nodes can start receiving
3782 * Frames right away
3783 */
3784 if (ifp->flags & IFA_F_OPTIMISTIC) {
3785 ip6_ins_rt(ifp->rt);
3786 if (ipv6_use_optimistic_addr(idev)) {
3787 /* Because optimistic nodes can use this address,
3788 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3789 */
3790 notify = true;
3791 }
3792 }
3793
3794 addrconf_dad_kick(ifp);
3795 out:
3796 spin_unlock(&ifp->lock);
3797 read_unlock_bh(&idev->lock);
3798 if (notify)
3799 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3800 }
3801
3802 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3803 {
3804 bool begin_dad = false;
3805
3806 spin_lock_bh(&ifp->lock);
3807 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3808 ifp->state = INET6_IFADDR_STATE_PREDAD;
3809 begin_dad = true;
3810 }
3811 spin_unlock_bh(&ifp->lock);
3812
3813 if (begin_dad)
3814 addrconf_mod_dad_work(ifp, 0);
3815 }
3816
3817 static void addrconf_dad_work(struct work_struct *w)
3818 {
3819 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3820 struct inet6_ifaddr,
3821 dad_work);
3822 struct inet6_dev *idev = ifp->idev;
3823 struct in6_addr mcaddr;
3824 bool disable_ipv6 = false;
3825
3826 enum {
3827 DAD_PROCESS,
3828 DAD_BEGIN,
3829 DAD_ABORT,
3830 } action = DAD_PROCESS;
3831
3832 rtnl_lock();
3833
3834 spin_lock_bh(&ifp->lock);
3835 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3836 action = DAD_BEGIN;
3837 ifp->state = INET6_IFADDR_STATE_DAD;
3838 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3839 action = DAD_ABORT;
3840 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3841
3842 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3843 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3844 struct in6_addr addr;
3845
3846 addr.s6_addr32[0] = htonl(0xfe800000);
3847 addr.s6_addr32[1] = 0;
3848
3849 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3850 ipv6_addr_equal(&ifp->addr, &addr)) {
3851 /* DAD failed for link-local based on MAC */
3852 idev->cnf.disable_ipv6 = 1;
3853
3854 pr_info("%s: IPv6 being disabled!\n",
3855 ifp->idev->dev->name);
3856 disable_ipv6 = true;
3857 }
3858 }
3859 }
3860 spin_unlock_bh(&ifp->lock);
3861
3862 if (action == DAD_BEGIN) {
3863 addrconf_dad_begin(ifp);
3864 goto out;
3865 } else if (action == DAD_ABORT) {
3866 in6_ifa_hold(ifp);
3867 addrconf_dad_stop(ifp, 1);
3868 if (disable_ipv6)
3869 addrconf_ifdown(idev->dev, 0);
3870 goto out;
3871 }
3872
3873 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3874 goto out;
3875
3876 write_lock_bh(&idev->lock);
3877 if (idev->dead || !(idev->if_flags & IF_READY)) {
3878 write_unlock_bh(&idev->lock);
3879 goto out;
3880 }
3881
3882 spin_lock(&ifp->lock);
3883 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3884 spin_unlock(&ifp->lock);
3885 write_unlock_bh(&idev->lock);
3886 goto out;
3887 }
3888
3889 if (ifp->dad_probes == 0) {
3890 /*
3891 * DAD was successful
3892 */
3893
3894 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3895 spin_unlock(&ifp->lock);
3896 write_unlock_bh(&idev->lock);
3897
3898 addrconf_dad_completed(ifp);
3899
3900 goto out;
3901 }
3902
3903 ifp->dad_probes--;
3904 addrconf_mod_dad_work(ifp,
3905 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3906 spin_unlock(&ifp->lock);
3907 write_unlock_bh(&idev->lock);
3908
3909 /* send a neighbour solicitation for our addr */
3910 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3911 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3912 out:
3913 in6_ifa_put(ifp);
3914 rtnl_unlock();
3915 }
3916
3917 /* ifp->idev must be at least read locked */
3918 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3919 {
3920 struct inet6_ifaddr *ifpiter;
3921 struct inet6_dev *idev = ifp->idev;
3922
3923 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3924 if (ifpiter->scope > IFA_LINK)
3925 break;
3926 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3927 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3928 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3929 IFA_F_PERMANENT)
3930 return false;
3931 }
3932 return true;
3933 }
3934
3935 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3936 {
3937 struct net_device *dev = ifp->idev->dev;
3938 struct in6_addr lladdr;
3939 bool send_rs, send_mld;
3940
3941 addrconf_del_dad_work(ifp);
3942
3943 /*
3944 * Configure the address for reception. Now it is valid.
3945 */
3946
3947 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3948
3949 /* If added prefix is link local and we are prepared to process
3950 router advertisements, start sending router solicitations.
3951 */
3952
3953 read_lock_bh(&ifp->idev->lock);
3954 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3955 send_rs = send_mld &&
3956 ipv6_accept_ra(ifp->idev) &&
3957 ifp->idev->cnf.rtr_solicits != 0 &&
3958 (dev->flags&IFF_LOOPBACK) == 0;
3959 read_unlock_bh(&ifp->idev->lock);
3960
3961 /* While dad is in progress mld report's source address is in6_addrany.
3962 * Resend with proper ll now.
3963 */
3964 if (send_mld)
3965 ipv6_mc_dad_complete(ifp->idev);
3966
3967 if (send_rs) {
3968 /*
3969 * If a host as already performed a random delay
3970 * [...] as part of DAD [...] there is no need
3971 * to delay again before sending the first RS
3972 */
3973 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3974 return;
3975 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3976
3977 write_lock_bh(&ifp->idev->lock);
3978 spin_lock(&ifp->lock);
3979 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
3980 ifp->idev->cnf.rtr_solicit_interval);
3981 ifp->idev->rs_probes = 1;
3982 ifp->idev->if_flags |= IF_RS_SENT;
3983 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
3984 spin_unlock(&ifp->lock);
3985 write_unlock_bh(&ifp->idev->lock);
3986 }
3987 }
3988
3989 static void addrconf_dad_run(struct inet6_dev *idev)
3990 {
3991 struct inet6_ifaddr *ifp;
3992
3993 read_lock_bh(&idev->lock);
3994 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3995 spin_lock(&ifp->lock);
3996 if (ifp->flags & IFA_F_TENTATIVE &&
3997 ifp->state == INET6_IFADDR_STATE_DAD)
3998 addrconf_dad_kick(ifp);
3999 spin_unlock(&ifp->lock);
4000 }
4001 read_unlock_bh(&idev->lock);
4002 }
4003
4004 #ifdef CONFIG_PROC_FS
4005 struct if6_iter_state {
4006 struct seq_net_private p;
4007 int bucket;
4008 int offset;
4009 };
4010
4011 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4012 {
4013 struct inet6_ifaddr *ifa = NULL;
4014 struct if6_iter_state *state = seq->private;
4015 struct net *net = seq_file_net(seq);
4016 int p = 0;
4017
4018 /* initial bucket if pos is 0 */
4019 if (pos == 0) {
4020 state->bucket = 0;
4021 state->offset = 0;
4022 }
4023
4024 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4025 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4026 addr_lst) {
4027 if (!net_eq(dev_net(ifa->idev->dev), net))
4028 continue;
4029 /* sync with offset */
4030 if (p < state->offset) {
4031 p++;
4032 continue;
4033 }
4034 state->offset++;
4035 return ifa;
4036 }
4037
4038 /* prepare for next bucket */
4039 state->offset = 0;
4040 p = 0;
4041 }
4042 return NULL;
4043 }
4044
4045 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4046 struct inet6_ifaddr *ifa)
4047 {
4048 struct if6_iter_state *state = seq->private;
4049 struct net *net = seq_file_net(seq);
4050
4051 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4052 if (!net_eq(dev_net(ifa->idev->dev), net))
4053 continue;
4054 state->offset++;
4055 return ifa;
4056 }
4057
4058 while (++state->bucket < IN6_ADDR_HSIZE) {
4059 state->offset = 0;
4060 hlist_for_each_entry_rcu_bh(ifa,
4061 &inet6_addr_lst[state->bucket], addr_lst) {
4062 if (!net_eq(dev_net(ifa->idev->dev), net))
4063 continue;
4064 state->offset++;
4065 return ifa;
4066 }
4067 }
4068
4069 return NULL;
4070 }
4071
4072 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4073 __acquires(rcu_bh)
4074 {
4075 rcu_read_lock_bh();
4076 return if6_get_first(seq, *pos);
4077 }
4078
4079 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4080 {
4081 struct inet6_ifaddr *ifa;
4082
4083 ifa = if6_get_next(seq, v);
4084 ++*pos;
4085 return ifa;
4086 }
4087
4088 static void if6_seq_stop(struct seq_file *seq, void *v)
4089 __releases(rcu_bh)
4090 {
4091 rcu_read_unlock_bh();
4092 }
4093
4094 static int if6_seq_show(struct seq_file *seq, void *v)
4095 {
4096 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4097 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4098 &ifp->addr,
4099 ifp->idev->dev->ifindex,
4100 ifp->prefix_len,
4101 ifp->scope,
4102 (u8) ifp->flags,
4103 ifp->idev->dev->name);
4104 return 0;
4105 }
4106
4107 static const struct seq_operations if6_seq_ops = {
4108 .start = if6_seq_start,
4109 .next = if6_seq_next,
4110 .show = if6_seq_show,
4111 .stop = if6_seq_stop,
4112 };
4113
4114 static int if6_seq_open(struct inode *inode, struct file *file)
4115 {
4116 return seq_open_net(inode, file, &if6_seq_ops,
4117 sizeof(struct if6_iter_state));
4118 }
4119
4120 static const struct file_operations if6_fops = {
4121 .owner = THIS_MODULE,
4122 .open = if6_seq_open,
4123 .read = seq_read,
4124 .llseek = seq_lseek,
4125 .release = seq_release_net,
4126 };
4127
4128 static int __net_init if6_proc_net_init(struct net *net)
4129 {
4130 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4131 return -ENOMEM;
4132 return 0;
4133 }
4134
4135 static void __net_exit if6_proc_net_exit(struct net *net)
4136 {
4137 remove_proc_entry("if_inet6", net->proc_net);
4138 }
4139
4140 static struct pernet_operations if6_proc_net_ops = {
4141 .init = if6_proc_net_init,
4142 .exit = if6_proc_net_exit,
4143 };
4144
4145 int __init if6_proc_init(void)
4146 {
4147 return register_pernet_subsys(&if6_proc_net_ops);
4148 }
4149
4150 void if6_proc_exit(void)
4151 {
4152 unregister_pernet_subsys(&if6_proc_net_ops);
4153 }
4154 #endif /* CONFIG_PROC_FS */
4155
4156 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4157 /* Check if address is a home address configured on any interface. */
4158 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4159 {
4160 int ret = 0;
4161 struct inet6_ifaddr *ifp = NULL;
4162 unsigned int hash = inet6_addr_hash(addr);
4163
4164 rcu_read_lock_bh();
4165 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4166 if (!net_eq(dev_net(ifp->idev->dev), net))
4167 continue;
4168 if (ipv6_addr_equal(&ifp->addr, addr) &&
4169 (ifp->flags & IFA_F_HOMEADDRESS)) {
4170 ret = 1;
4171 break;
4172 }
4173 }
4174 rcu_read_unlock_bh();
4175 return ret;
4176 }
4177 #endif
4178
4179 /*
4180 * Periodic address status verification
4181 */
4182
4183 static void addrconf_verify_rtnl(void)
4184 {
4185 unsigned long now, next, next_sec, next_sched;
4186 struct inet6_ifaddr *ifp;
4187 int i;
4188
4189 ASSERT_RTNL();
4190
4191 rcu_read_lock_bh();
4192 now = jiffies;
4193 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4194
4195 cancel_delayed_work(&addr_chk_work);
4196
4197 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4198 restart:
4199 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4200 unsigned long age;
4201
4202 /* When setting preferred_lft to a value not zero or
4203 * infinity, while valid_lft is infinity
4204 * IFA_F_PERMANENT has a non-infinity life time.
4205 */
4206 if ((ifp->flags & IFA_F_PERMANENT) &&
4207 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4208 continue;
4209
4210 spin_lock(&ifp->lock);
4211 /* We try to batch several events at once. */
4212 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4213
4214 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4215 age >= ifp->valid_lft) {
4216 spin_unlock(&ifp->lock);
4217 in6_ifa_hold(ifp);
4218 ipv6_del_addr(ifp);
4219 goto restart;
4220 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4221 spin_unlock(&ifp->lock);
4222 continue;
4223 } else if (age >= ifp->prefered_lft) {
4224 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4225 int deprecate = 0;
4226
4227 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4228 deprecate = 1;
4229 ifp->flags |= IFA_F_DEPRECATED;
4230 }
4231
4232 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4233 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4234 next = ifp->tstamp + ifp->valid_lft * HZ;
4235
4236 spin_unlock(&ifp->lock);
4237
4238 if (deprecate) {
4239 in6_ifa_hold(ifp);
4240
4241 ipv6_ifa_notify(0, ifp);
4242 in6_ifa_put(ifp);
4243 goto restart;
4244 }
4245 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4246 !(ifp->flags&IFA_F_TENTATIVE)) {
4247 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4248 ifp->idev->cnf.dad_transmits *
4249 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4250
4251 if (age >= ifp->prefered_lft - regen_advance) {
4252 struct inet6_ifaddr *ifpub = ifp->ifpub;
4253 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4254 next = ifp->tstamp + ifp->prefered_lft * HZ;
4255 if (!ifp->regen_count && ifpub) {
4256 ifp->regen_count++;
4257 in6_ifa_hold(ifp);
4258 in6_ifa_hold(ifpub);
4259 spin_unlock(&ifp->lock);
4260
4261 spin_lock(&ifpub->lock);
4262 ifpub->regen_count = 0;
4263 spin_unlock(&ifpub->lock);
4264 ipv6_create_tempaddr(ifpub, ifp);
4265 in6_ifa_put(ifpub);
4266 in6_ifa_put(ifp);
4267 goto restart;
4268 }
4269 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4270 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4271 spin_unlock(&ifp->lock);
4272 } else {
4273 /* ifp->prefered_lft <= ifp->valid_lft */
4274 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4275 next = ifp->tstamp + ifp->prefered_lft * HZ;
4276 spin_unlock(&ifp->lock);
4277 }
4278 }
4279 }
4280
4281 next_sec = round_jiffies_up(next);
4282 next_sched = next;
4283
4284 /* If rounded timeout is accurate enough, accept it. */
4285 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4286 next_sched = next_sec;
4287
4288 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4289 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4290 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4291
4292 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4293 now, next, next_sec, next_sched);
4294 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4295 rcu_read_unlock_bh();
4296 }
4297
4298 static void addrconf_verify_work(struct work_struct *w)
4299 {
4300 rtnl_lock();
4301 addrconf_verify_rtnl();
4302 rtnl_unlock();
4303 }
4304
4305 static void addrconf_verify(void)
4306 {
4307 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4308 }
4309
4310 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4311 struct in6_addr **peer_pfx)
4312 {
4313 struct in6_addr *pfx = NULL;
4314
4315 *peer_pfx = NULL;
4316
4317 if (addr)
4318 pfx = nla_data(addr);
4319
4320 if (local) {
4321 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4322 *peer_pfx = pfx;
4323 pfx = nla_data(local);
4324 }
4325
4326 return pfx;
4327 }
4328
4329 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4330 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4331 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4332 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4333 [IFA_FLAGS] = { .len = sizeof(u32) },
4334 };
4335
4336 static int
4337 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4338 {
4339 struct net *net = sock_net(skb->sk);
4340 struct ifaddrmsg *ifm;
4341 struct nlattr *tb[IFA_MAX+1];
4342 struct in6_addr *pfx, *peer_pfx;
4343 u32 ifa_flags;
4344 int err;
4345
4346 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4347 if (err < 0)
4348 return err;
4349
4350 ifm = nlmsg_data(nlh);
4351 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4352 if (!pfx)
4353 return -EINVAL;
4354
4355 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4356
4357 /* We ignore other flags so far. */
4358 ifa_flags &= IFA_F_MANAGETEMPADDR;
4359
4360 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4361 ifm->ifa_prefixlen);
4362 }
4363
4364 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4365 u32 prefered_lft, u32 valid_lft)
4366 {
4367 u32 flags;
4368 clock_t expires;
4369 unsigned long timeout;
4370 bool was_managetempaddr;
4371 bool had_prefixroute;
4372
4373 ASSERT_RTNL();
4374
4375 if (!valid_lft || (prefered_lft > valid_lft))
4376 return -EINVAL;
4377
4378 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4379 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4380 return -EINVAL;
4381
4382 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4383 if (addrconf_finite_timeout(timeout)) {
4384 expires = jiffies_to_clock_t(timeout * HZ);
4385 valid_lft = timeout;
4386 flags = RTF_EXPIRES;
4387 } else {
4388 expires = 0;
4389 flags = 0;
4390 ifa_flags |= IFA_F_PERMANENT;
4391 }
4392
4393 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4394 if (addrconf_finite_timeout(timeout)) {
4395 if (timeout == 0)
4396 ifa_flags |= IFA_F_DEPRECATED;
4397 prefered_lft = timeout;
4398 }
4399
4400 spin_lock_bh(&ifp->lock);
4401 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4402 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4403 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4404 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4405 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4406 IFA_F_NOPREFIXROUTE);
4407 ifp->flags |= ifa_flags;
4408 ifp->tstamp = jiffies;
4409 ifp->valid_lft = valid_lft;
4410 ifp->prefered_lft = prefered_lft;
4411
4412 spin_unlock_bh(&ifp->lock);
4413 if (!(ifp->flags&IFA_F_TENTATIVE))
4414 ipv6_ifa_notify(0, ifp);
4415
4416 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4417 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4418 expires, flags);
4419 } else if (had_prefixroute) {
4420 enum cleanup_prefix_rt_t action;
4421 unsigned long rt_expires;
4422
4423 write_lock_bh(&ifp->idev->lock);
4424 action = check_cleanup_prefix_route(ifp, &rt_expires);
4425 write_unlock_bh(&ifp->idev->lock);
4426
4427 if (action != CLEANUP_PREFIX_RT_NOP) {
4428 cleanup_prefix_route(ifp, rt_expires,
4429 action == CLEANUP_PREFIX_RT_DEL);
4430 }
4431 }
4432
4433 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4434 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4435 valid_lft = prefered_lft = 0;
4436 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4437 !was_managetempaddr, jiffies);
4438 }
4439
4440 addrconf_verify_rtnl();
4441
4442 return 0;
4443 }
4444
4445 static int
4446 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4447 {
4448 struct net *net = sock_net(skb->sk);
4449 struct ifaddrmsg *ifm;
4450 struct nlattr *tb[IFA_MAX+1];
4451 struct in6_addr *pfx, *peer_pfx;
4452 struct inet6_ifaddr *ifa;
4453 struct net_device *dev;
4454 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4455 u32 ifa_flags;
4456 int err;
4457
4458 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4459 if (err < 0)
4460 return err;
4461
4462 ifm = nlmsg_data(nlh);
4463 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4464 if (!pfx)
4465 return -EINVAL;
4466
4467 if (tb[IFA_CACHEINFO]) {
4468 struct ifa_cacheinfo *ci;
4469
4470 ci = nla_data(tb[IFA_CACHEINFO]);
4471 valid_lft = ci->ifa_valid;
4472 preferred_lft = ci->ifa_prefered;
4473 } else {
4474 preferred_lft = INFINITY_LIFE_TIME;
4475 valid_lft = INFINITY_LIFE_TIME;
4476 }
4477
4478 dev = __dev_get_by_index(net, ifm->ifa_index);
4479 if (!dev)
4480 return -ENODEV;
4481
4482 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4483
4484 /* We ignore other flags so far. */
4485 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4486 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4487
4488 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4489 if (!ifa) {
4490 /*
4491 * It would be best to check for !NLM_F_CREATE here but
4492 * userspace already relies on not having to provide this.
4493 */
4494 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4495 ifm->ifa_prefixlen, ifa_flags,
4496 preferred_lft, valid_lft);
4497 }
4498
4499 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4500 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4501 err = -EEXIST;
4502 else
4503 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4504
4505 in6_ifa_put(ifa);
4506
4507 return err;
4508 }
4509
4510 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4511 u8 scope, int ifindex)
4512 {
4513 struct ifaddrmsg *ifm;
4514
4515 ifm = nlmsg_data(nlh);
4516 ifm->ifa_family = AF_INET6;
4517 ifm->ifa_prefixlen = prefixlen;
4518 ifm->ifa_flags = flags;
4519 ifm->ifa_scope = scope;
4520 ifm->ifa_index = ifindex;
4521 }
4522
4523 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4524 unsigned long tstamp, u32 preferred, u32 valid)
4525 {
4526 struct ifa_cacheinfo ci;
4527
4528 ci.cstamp = cstamp_delta(cstamp);
4529 ci.tstamp = cstamp_delta(tstamp);
4530 ci.ifa_prefered = preferred;
4531 ci.ifa_valid = valid;
4532
4533 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4534 }
4535
4536 static inline int rt_scope(int ifa_scope)
4537 {
4538 if (ifa_scope & IFA_HOST)
4539 return RT_SCOPE_HOST;
4540 else if (ifa_scope & IFA_LINK)
4541 return RT_SCOPE_LINK;
4542 else if (ifa_scope & IFA_SITE)
4543 return RT_SCOPE_SITE;
4544 else
4545 return RT_SCOPE_UNIVERSE;
4546 }
4547
4548 static inline int inet6_ifaddr_msgsize(void)
4549 {
4550 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4551 + nla_total_size(16) /* IFA_LOCAL */
4552 + nla_total_size(16) /* IFA_ADDRESS */
4553 + nla_total_size(sizeof(struct ifa_cacheinfo))
4554 + nla_total_size(4) /* IFA_FLAGS */;
4555 }
4556
4557 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4558 u32 portid, u32 seq, int event, unsigned int flags)
4559 {
4560 struct nlmsghdr *nlh;
4561 u32 preferred, valid;
4562
4563 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4564 if (!nlh)
4565 return -EMSGSIZE;
4566
4567 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4568 ifa->idev->dev->ifindex);
4569
4570 if (!((ifa->flags&IFA_F_PERMANENT) &&
4571 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4572 preferred = ifa->prefered_lft;
4573 valid = ifa->valid_lft;
4574 if (preferred != INFINITY_LIFE_TIME) {
4575 long tval = (jiffies - ifa->tstamp)/HZ;
4576 if (preferred > tval)
4577 preferred -= tval;
4578 else
4579 preferred = 0;
4580 if (valid != INFINITY_LIFE_TIME) {
4581 if (valid > tval)
4582 valid -= tval;
4583 else
4584 valid = 0;
4585 }
4586 }
4587 } else {
4588 preferred = INFINITY_LIFE_TIME;
4589 valid = INFINITY_LIFE_TIME;
4590 }
4591
4592 if (!ipv6_addr_any(&ifa->peer_addr)) {
4593 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4594 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4595 goto error;
4596 } else
4597 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4598 goto error;
4599
4600 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4601 goto error;
4602
4603 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4604 goto error;
4605
4606 nlmsg_end(skb, nlh);
4607 return 0;
4608
4609 error:
4610 nlmsg_cancel(skb, nlh);
4611 return -EMSGSIZE;
4612 }
4613
4614 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4615 u32 portid, u32 seq, int event, u16 flags)
4616 {
4617 struct nlmsghdr *nlh;
4618 u8 scope = RT_SCOPE_UNIVERSE;
4619 int ifindex = ifmca->idev->dev->ifindex;
4620
4621 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4622 scope = RT_SCOPE_SITE;
4623
4624 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4625 if (!nlh)
4626 return -EMSGSIZE;
4627
4628 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4629 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4630 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4631 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4632 nlmsg_cancel(skb, nlh);
4633 return -EMSGSIZE;
4634 }
4635
4636 nlmsg_end(skb, nlh);
4637 return 0;
4638 }
4639
4640 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4641 u32 portid, u32 seq, int event, unsigned int flags)
4642 {
4643 struct nlmsghdr *nlh;
4644 u8 scope = RT_SCOPE_UNIVERSE;
4645 int ifindex = ifaca->aca_idev->dev->ifindex;
4646
4647 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4648 scope = RT_SCOPE_SITE;
4649
4650 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4651 if (!nlh)
4652 return -EMSGSIZE;
4653
4654 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4655 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4656 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4657 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4658 nlmsg_cancel(skb, nlh);
4659 return -EMSGSIZE;
4660 }
4661
4662 nlmsg_end(skb, nlh);
4663 return 0;
4664 }
4665
4666 enum addr_type_t {
4667 UNICAST_ADDR,
4668 MULTICAST_ADDR,
4669 ANYCAST_ADDR,
4670 };
4671
4672 /* called with rcu_read_lock() */
4673 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4674 struct netlink_callback *cb, enum addr_type_t type,
4675 int s_ip_idx, int *p_ip_idx)
4676 {
4677 struct ifmcaddr6 *ifmca;
4678 struct ifacaddr6 *ifaca;
4679 int err = 1;
4680 int ip_idx = *p_ip_idx;
4681
4682 read_lock_bh(&idev->lock);
4683 switch (type) {
4684 case UNICAST_ADDR: {
4685 struct inet6_ifaddr *ifa;
4686
4687 /* unicast address incl. temp addr */
4688 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4689 if (++ip_idx < s_ip_idx)
4690 continue;
4691 err = inet6_fill_ifaddr(skb, ifa,
4692 NETLINK_CB(cb->skb).portid,
4693 cb->nlh->nlmsg_seq,
4694 RTM_NEWADDR,
4695 NLM_F_MULTI);
4696 if (err < 0)
4697 break;
4698 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4699 }
4700 break;
4701 }
4702 case MULTICAST_ADDR:
4703 /* multicast address */
4704 for (ifmca = idev->mc_list; ifmca;
4705 ifmca = ifmca->next, ip_idx++) {
4706 if (ip_idx < s_ip_idx)
4707 continue;
4708 err = inet6_fill_ifmcaddr(skb, ifmca,
4709 NETLINK_CB(cb->skb).portid,
4710 cb->nlh->nlmsg_seq,
4711 RTM_GETMULTICAST,
4712 NLM_F_MULTI);
4713 if (err < 0)
4714 break;
4715 }
4716 break;
4717 case ANYCAST_ADDR:
4718 /* anycast address */
4719 for (ifaca = idev->ac_list; ifaca;
4720 ifaca = ifaca->aca_next, ip_idx++) {
4721 if (ip_idx < s_ip_idx)
4722 continue;
4723 err = inet6_fill_ifacaddr(skb, ifaca,
4724 NETLINK_CB(cb->skb).portid,
4725 cb->nlh->nlmsg_seq,
4726 RTM_GETANYCAST,
4727 NLM_F_MULTI);
4728 if (err < 0)
4729 break;
4730 }
4731 break;
4732 default:
4733 break;
4734 }
4735 read_unlock_bh(&idev->lock);
4736 *p_ip_idx = ip_idx;
4737 return err;
4738 }
4739
4740 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4741 enum addr_type_t type)
4742 {
4743 struct net *net = sock_net(skb->sk);
4744 int h, s_h;
4745 int idx, ip_idx;
4746 int s_idx, s_ip_idx;
4747 struct net_device *dev;
4748 struct inet6_dev *idev;
4749 struct hlist_head *head;
4750
4751 s_h = cb->args[0];
4752 s_idx = idx = cb->args[1];
4753 s_ip_idx = ip_idx = cb->args[2];
4754
4755 rcu_read_lock();
4756 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4757 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4758 idx = 0;
4759 head = &net->dev_index_head[h];
4760 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4761 if (idx < s_idx)
4762 goto cont;
4763 if (h > s_h || idx > s_idx)
4764 s_ip_idx = 0;
4765 ip_idx = 0;
4766 idev = __in6_dev_get(dev);
4767 if (!idev)
4768 goto cont;
4769
4770 if (in6_dump_addrs(idev, skb, cb, type,
4771 s_ip_idx, &ip_idx) < 0)
4772 goto done;
4773 cont:
4774 idx++;
4775 }
4776 }
4777 done:
4778 rcu_read_unlock();
4779 cb->args[0] = h;
4780 cb->args[1] = idx;
4781 cb->args[2] = ip_idx;
4782
4783 return skb->len;
4784 }
4785
4786 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4787 {
4788 enum addr_type_t type = UNICAST_ADDR;
4789
4790 return inet6_dump_addr(skb, cb, type);
4791 }
4792
4793 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4794 {
4795 enum addr_type_t type = MULTICAST_ADDR;
4796
4797 return inet6_dump_addr(skb, cb, type);
4798 }
4799
4800
4801 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4802 {
4803 enum addr_type_t type = ANYCAST_ADDR;
4804
4805 return inet6_dump_addr(skb, cb, type);
4806 }
4807
4808 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4809 {
4810 struct net *net = sock_net(in_skb->sk);
4811 struct ifaddrmsg *ifm;
4812 struct nlattr *tb[IFA_MAX+1];
4813 struct in6_addr *addr = NULL, *peer;
4814 struct net_device *dev = NULL;
4815 struct inet6_ifaddr *ifa;
4816 struct sk_buff *skb;
4817 int err;
4818
4819 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4820 if (err < 0)
4821 goto errout;
4822
4823 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4824 if (!addr) {
4825 err = -EINVAL;
4826 goto errout;
4827 }
4828
4829 ifm = nlmsg_data(nlh);
4830 if (ifm->ifa_index)
4831 dev = __dev_get_by_index(net, ifm->ifa_index);
4832
4833 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4834 if (!ifa) {
4835 err = -EADDRNOTAVAIL;
4836 goto errout;
4837 }
4838
4839 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4840 if (!skb) {
4841 err = -ENOBUFS;
4842 goto errout_ifa;
4843 }
4844
4845 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4846 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4847 if (err < 0) {
4848 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4849 WARN_ON(err == -EMSGSIZE);
4850 kfree_skb(skb);
4851 goto errout_ifa;
4852 }
4853 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4854 errout_ifa:
4855 in6_ifa_put(ifa);
4856 errout:
4857 return err;
4858 }
4859
4860 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4861 {
4862 struct sk_buff *skb;
4863 struct net *net = dev_net(ifa->idev->dev);
4864 int err = -ENOBUFS;
4865
4866 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4867 if (!skb)
4868 goto errout;
4869
4870 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4871 if (err < 0) {
4872 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4873 WARN_ON(err == -EMSGSIZE);
4874 kfree_skb(skb);
4875 goto errout;
4876 }
4877 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4878 return;
4879 errout:
4880 if (err < 0)
4881 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4882 }
4883
4884 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4885 __s32 *array, int bytes)
4886 {
4887 BUG_ON(bytes < (DEVCONF_MAX * 4));
4888
4889 memset(array, 0, bytes);
4890 array[DEVCONF_FORWARDING] = cnf->forwarding;
4891 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4892 array[DEVCONF_MTU6] = cnf->mtu6;
4893 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4894 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4895 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4896 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4897 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4898 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4899 jiffies_to_msecs(cnf->rtr_solicit_interval);
4900 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4901 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
4902 array[DEVCONF_RTR_SOLICIT_DELAY] =
4903 jiffies_to_msecs(cnf->rtr_solicit_delay);
4904 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4905 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4906 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4907 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4908 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4909 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4910 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4911 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4912 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4913 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4914 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4915 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4916 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4917 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4918 #ifdef CONFIG_IPV6_ROUTER_PREF
4919 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4920 array[DEVCONF_RTR_PROBE_INTERVAL] =
4921 jiffies_to_msecs(cnf->rtr_probe_interval);
4922 #ifdef CONFIG_IPV6_ROUTE_INFO
4923 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4924 #endif
4925 #endif
4926 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4927 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4928 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4929 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4930 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4931 #endif
4932 #ifdef CONFIG_IPV6_MROUTE
4933 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4934 #endif
4935 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4936 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4937 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4938 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4939 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4940 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4941 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4942 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4943 /* we omit DEVCONF_STABLE_SECRET for now */
4944 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4945 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4946 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4947 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4948 }
4949
4950 static inline size_t inet6_ifla6_size(void)
4951 {
4952 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4953 + nla_total_size(sizeof(struct ifla_cacheinfo))
4954 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4955 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4956 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4957 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4958 }
4959
4960 static inline size_t inet6_if_nlmsg_size(void)
4961 {
4962 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4963 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4964 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4965 + nla_total_size(4) /* IFLA_MTU */
4966 + nla_total_size(4) /* IFLA_LINK */
4967 + nla_total_size(1) /* IFLA_OPERSTATE */
4968 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4969 }
4970
4971 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4972 int bytes)
4973 {
4974 int i;
4975 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
4976 BUG_ON(pad < 0);
4977
4978 /* Use put_unaligned() because stats may not be aligned for u64. */
4979 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
4980 for (i = 1; i < ICMP6_MIB_MAX; i++)
4981 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4982
4983 memset(&stats[ICMP6_MIB_MAX], 0, pad);
4984 }
4985
4986 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4987 int bytes, size_t syncpoff)
4988 {
4989 int i, c;
4990 u64 buff[IPSTATS_MIB_MAX];
4991 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4992
4993 BUG_ON(pad < 0);
4994
4995 memset(buff, 0, sizeof(buff));
4996 buff[0] = IPSTATS_MIB_MAX;
4997
4998 for_each_possible_cpu(c) {
4999 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5000 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5001 }
5002
5003 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5004 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5005 }
5006
5007 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5008 int bytes)
5009 {
5010 switch (attrtype) {
5011 case IFLA_INET6_STATS:
5012 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5013 offsetof(struct ipstats_mib, syncp));
5014 break;
5015 case IFLA_INET6_ICMP6STATS:
5016 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5017 break;
5018 }
5019 }
5020
5021 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5022 u32 ext_filter_mask)
5023 {
5024 struct nlattr *nla;
5025 struct ifla_cacheinfo ci;
5026
5027 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5028 goto nla_put_failure;
5029 ci.max_reasm_len = IPV6_MAXPLEN;
5030 ci.tstamp = cstamp_delta(idev->tstamp);
5031 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5032 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5033 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5034 goto nla_put_failure;
5035 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5036 if (!nla)
5037 goto nla_put_failure;
5038 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5039
5040 /* XXX - MC not implemented */
5041
5042 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5043 return 0;
5044
5045 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5046 if (!nla)
5047 goto nla_put_failure;
5048 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5049
5050 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5051 if (!nla)
5052 goto nla_put_failure;
5053 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5054
5055 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5056 if (!nla)
5057 goto nla_put_failure;
5058
5059 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
5060 goto nla_put_failure;
5061
5062 read_lock_bh(&idev->lock);
5063 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5064 read_unlock_bh(&idev->lock);
5065
5066 return 0;
5067
5068 nla_put_failure:
5069 return -EMSGSIZE;
5070 }
5071
5072 static size_t inet6_get_link_af_size(const struct net_device *dev,
5073 u32 ext_filter_mask)
5074 {
5075 if (!__in6_dev_get(dev))
5076 return 0;
5077
5078 return inet6_ifla6_size();
5079 }
5080
5081 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5082 u32 ext_filter_mask)
5083 {
5084 struct inet6_dev *idev = __in6_dev_get(dev);
5085
5086 if (!idev)
5087 return -ENODATA;
5088
5089 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5090 return -EMSGSIZE;
5091
5092 return 0;
5093 }
5094
5095 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5096 {
5097 struct inet6_ifaddr *ifp;
5098 struct net_device *dev = idev->dev;
5099 bool clear_token, update_rs = false;
5100 struct in6_addr ll_addr;
5101
5102 ASSERT_RTNL();
5103
5104 if (!token)
5105 return -EINVAL;
5106 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5107 return -EINVAL;
5108 if (!ipv6_accept_ra(idev))
5109 return -EINVAL;
5110 if (idev->cnf.rtr_solicits == 0)
5111 return -EINVAL;
5112
5113 write_lock_bh(&idev->lock);
5114
5115 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5116 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5117
5118 write_unlock_bh(&idev->lock);
5119
5120 clear_token = ipv6_addr_any(token);
5121 if (clear_token)
5122 goto update_lft;
5123
5124 if (!idev->dead && (idev->if_flags & IF_READY) &&
5125 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5126 IFA_F_OPTIMISTIC)) {
5127 /* If we're not ready, then normal ifup will take care
5128 * of this. Otherwise, we need to request our rs here.
5129 */
5130 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5131 update_rs = true;
5132 }
5133
5134 update_lft:
5135 write_lock_bh(&idev->lock);
5136
5137 if (update_rs) {
5138 idev->if_flags |= IF_RS_SENT;
5139 idev->rs_interval = rfc3315_s14_backoff_init(
5140 idev->cnf.rtr_solicit_interval);
5141 idev->rs_probes = 1;
5142 addrconf_mod_rs_timer(idev, idev->rs_interval);
5143 }
5144
5145 /* Well, that's kinda nasty ... */
5146 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5147 spin_lock(&ifp->lock);
5148 if (ifp->tokenized) {
5149 ifp->valid_lft = 0;
5150 ifp->prefered_lft = 0;
5151 }
5152 spin_unlock(&ifp->lock);
5153 }
5154
5155 write_unlock_bh(&idev->lock);
5156 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5157 addrconf_verify_rtnl();
5158 return 0;
5159 }
5160
5161 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5162 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5163 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5164 };
5165
5166 static int inet6_validate_link_af(const struct net_device *dev,
5167 const struct nlattr *nla)
5168 {
5169 struct nlattr *tb[IFLA_INET6_MAX + 1];
5170
5171 if (dev && !__in6_dev_get(dev))
5172 return -EAFNOSUPPORT;
5173
5174 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5175 }
5176
5177 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5178 {
5179 int err = -EINVAL;
5180 struct inet6_dev *idev = __in6_dev_get(dev);
5181 struct nlattr *tb[IFLA_INET6_MAX + 1];
5182
5183 if (!idev)
5184 return -EAFNOSUPPORT;
5185
5186 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5187 BUG();
5188
5189 if (tb[IFLA_INET6_TOKEN]) {
5190 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5191 if (err)
5192 return err;
5193 }
5194
5195 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5196 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5197
5198 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5199 mode != IN6_ADDR_GEN_MODE_NONE &&
5200 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5201 mode != IN6_ADDR_GEN_MODE_RANDOM)
5202 return -EINVAL;
5203
5204 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5205 !idev->cnf.stable_secret.initialized &&
5206 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
5207 return -EINVAL;
5208
5209 idev->addr_gen_mode = mode;
5210 err = 0;
5211 }
5212
5213 return err;
5214 }
5215
5216 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5217 u32 portid, u32 seq, int event, unsigned int flags)
5218 {
5219 struct net_device *dev = idev->dev;
5220 struct ifinfomsg *hdr;
5221 struct nlmsghdr *nlh;
5222 void *protoinfo;
5223
5224 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5225 if (!nlh)
5226 return -EMSGSIZE;
5227
5228 hdr = nlmsg_data(nlh);
5229 hdr->ifi_family = AF_INET6;
5230 hdr->__ifi_pad = 0;
5231 hdr->ifi_type = dev->type;
5232 hdr->ifi_index = dev->ifindex;
5233 hdr->ifi_flags = dev_get_flags(dev);
5234 hdr->ifi_change = 0;
5235
5236 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5237 (dev->addr_len &&
5238 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5239 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5240 (dev->ifindex != dev_get_iflink(dev) &&
5241 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5242 nla_put_u8(skb, IFLA_OPERSTATE,
5243 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5244 goto nla_put_failure;
5245 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5246 if (!protoinfo)
5247 goto nla_put_failure;
5248
5249 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5250 goto nla_put_failure;
5251
5252 nla_nest_end(skb, protoinfo);
5253 nlmsg_end(skb, nlh);
5254 return 0;
5255
5256 nla_put_failure:
5257 nlmsg_cancel(skb, nlh);
5258 return -EMSGSIZE;
5259 }
5260
5261 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5262 {
5263 struct net *net = sock_net(skb->sk);
5264 int h, s_h;
5265 int idx = 0, s_idx;
5266 struct net_device *dev;
5267 struct inet6_dev *idev;
5268 struct hlist_head *head;
5269
5270 s_h = cb->args[0];
5271 s_idx = cb->args[1];
5272
5273 rcu_read_lock();
5274 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5275 idx = 0;
5276 head = &net->dev_index_head[h];
5277 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5278 if (idx < s_idx)
5279 goto cont;
5280 idev = __in6_dev_get(dev);
5281 if (!idev)
5282 goto cont;
5283 if (inet6_fill_ifinfo(skb, idev,
5284 NETLINK_CB(cb->skb).portid,
5285 cb->nlh->nlmsg_seq,
5286 RTM_NEWLINK, NLM_F_MULTI) < 0)
5287 goto out;
5288 cont:
5289 idx++;
5290 }
5291 }
5292 out:
5293 rcu_read_unlock();
5294 cb->args[1] = idx;
5295 cb->args[0] = h;
5296
5297 return skb->len;
5298 }
5299
5300 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5301 {
5302 struct sk_buff *skb;
5303 struct net *net = dev_net(idev->dev);
5304 int err = -ENOBUFS;
5305
5306 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5307 if (!skb)
5308 goto errout;
5309
5310 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5311 if (err < 0) {
5312 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5313 WARN_ON(err == -EMSGSIZE);
5314 kfree_skb(skb);
5315 goto errout;
5316 }
5317 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5318 return;
5319 errout:
5320 if (err < 0)
5321 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5322 }
5323
5324 static inline size_t inet6_prefix_nlmsg_size(void)
5325 {
5326 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5327 + nla_total_size(sizeof(struct in6_addr))
5328 + nla_total_size(sizeof(struct prefix_cacheinfo));
5329 }
5330
5331 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5332 struct prefix_info *pinfo, u32 portid, u32 seq,
5333 int event, unsigned int flags)
5334 {
5335 struct prefixmsg *pmsg;
5336 struct nlmsghdr *nlh;
5337 struct prefix_cacheinfo ci;
5338
5339 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5340 if (!nlh)
5341 return -EMSGSIZE;
5342
5343 pmsg = nlmsg_data(nlh);
5344 pmsg->prefix_family = AF_INET6;
5345 pmsg->prefix_pad1 = 0;
5346 pmsg->prefix_pad2 = 0;
5347 pmsg->prefix_ifindex = idev->dev->ifindex;
5348 pmsg->prefix_len = pinfo->prefix_len;
5349 pmsg->prefix_type = pinfo->type;
5350 pmsg->prefix_pad3 = 0;
5351 pmsg->prefix_flags = 0;
5352 if (pinfo->onlink)
5353 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5354 if (pinfo->autoconf)
5355 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5356
5357 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5358 goto nla_put_failure;
5359 ci.preferred_time = ntohl(pinfo->prefered);
5360 ci.valid_time = ntohl(pinfo->valid);
5361 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5362 goto nla_put_failure;
5363 nlmsg_end(skb, nlh);
5364 return 0;
5365
5366 nla_put_failure:
5367 nlmsg_cancel(skb, nlh);
5368 return -EMSGSIZE;
5369 }
5370
5371 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5372 struct prefix_info *pinfo)
5373 {
5374 struct sk_buff *skb;
5375 struct net *net = dev_net(idev->dev);
5376 int err = -ENOBUFS;
5377
5378 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5379 if (!skb)
5380 goto errout;
5381
5382 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5383 if (err < 0) {
5384 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5385 WARN_ON(err == -EMSGSIZE);
5386 kfree_skb(skb);
5387 goto errout;
5388 }
5389 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5390 return;
5391 errout:
5392 if (err < 0)
5393 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5394 }
5395
5396 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5397 {
5398 struct net *net = dev_net(ifp->idev->dev);
5399
5400 if (event)
5401 ASSERT_RTNL();
5402
5403 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5404
5405 switch (event) {
5406 case RTM_NEWADDR:
5407 /*
5408 * If the address was optimistic
5409 * we inserted the route at the start of
5410 * our DAD process, so we don't need
5411 * to do it again
5412 */
5413 if (!(ifp->rt->rt6i_node))
5414 ip6_ins_rt(ifp->rt);
5415 if (ifp->idev->cnf.forwarding)
5416 addrconf_join_anycast(ifp);
5417 if (!ipv6_addr_any(&ifp->peer_addr))
5418 addrconf_prefix_route(&ifp->peer_addr, 128,
5419 ifp->idev->dev, 0, 0);
5420 break;
5421 case RTM_DELADDR:
5422 if (ifp->idev->cnf.forwarding)
5423 addrconf_leave_anycast(ifp);
5424 addrconf_leave_solict(ifp->idev, &ifp->addr);
5425 if (!ipv6_addr_any(&ifp->peer_addr)) {
5426 struct rt6_info *rt;
5427
5428 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5429 ifp->idev->dev, 0, 0);
5430 if (rt)
5431 ip6_del_rt(rt);
5432 }
5433 if (ifp->rt) {
5434 dst_hold(&ifp->rt->dst);
5435 ip6_del_rt(ifp->rt);
5436 }
5437 rt_genid_bump_ipv6(net);
5438 break;
5439 }
5440 atomic_inc(&net->ipv6.dev_addr_genid);
5441 }
5442
5443 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5444 {
5445 rcu_read_lock_bh();
5446 if (likely(ifp->idev->dead == 0))
5447 __ipv6_ifa_notify(event, ifp);
5448 rcu_read_unlock_bh();
5449 }
5450
5451 #ifdef CONFIG_SYSCTL
5452
5453 static
5454 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5455 void __user *buffer, size_t *lenp, loff_t *ppos)
5456 {
5457 int *valp = ctl->data;
5458 int val = *valp;
5459 loff_t pos = *ppos;
5460 struct ctl_table lctl;
5461 int ret;
5462
5463 /*
5464 * ctl->data points to idev->cnf.forwarding, we should
5465 * not modify it until we get the rtnl lock.
5466 */
5467 lctl = *ctl;
5468 lctl.data = &val;
5469
5470 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5471
5472 if (write)
5473 ret = addrconf_fixup_forwarding(ctl, valp, val);
5474 if (ret)
5475 *ppos = pos;
5476 return ret;
5477 }
5478
5479 static
5480 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5481 void __user *buffer, size_t *lenp, loff_t *ppos)
5482 {
5483 struct inet6_dev *idev = ctl->extra1;
5484 int min_mtu = IPV6_MIN_MTU;
5485 struct ctl_table lctl;
5486
5487 lctl = *ctl;
5488 lctl.extra1 = &min_mtu;
5489 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5490
5491 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5492 }
5493
5494 static void dev_disable_change(struct inet6_dev *idev)
5495 {
5496 struct netdev_notifier_info info;
5497
5498 if (!idev || !idev->dev)
5499 return;
5500
5501 netdev_notifier_info_init(&info, idev->dev);
5502 if (idev->cnf.disable_ipv6)
5503 addrconf_notify(NULL, NETDEV_DOWN, &info);
5504 else
5505 addrconf_notify(NULL, NETDEV_UP, &info);
5506 }
5507
5508 static void addrconf_disable_change(struct net *net, __s32 newf)
5509 {
5510 struct net_device *dev;
5511 struct inet6_dev *idev;
5512
5513 rcu_read_lock();
5514 for_each_netdev_rcu(net, dev) {
5515 idev = __in6_dev_get(dev);
5516 if (idev) {
5517 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5518 idev->cnf.disable_ipv6 = newf;
5519 if (changed)
5520 dev_disable_change(idev);
5521 }
5522 }
5523 rcu_read_unlock();
5524 }
5525
5526 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5527 {
5528 struct net *net;
5529 int old;
5530
5531 if (!rtnl_trylock())
5532 return restart_syscall();
5533
5534 net = (struct net *)table->extra2;
5535 old = *p;
5536 *p = newf;
5537
5538 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5539 rtnl_unlock();
5540 return 0;
5541 }
5542
5543 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5544 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5545 addrconf_disable_change(net, newf);
5546 } else if ((!newf) ^ (!old))
5547 dev_disable_change((struct inet6_dev *)table->extra1);
5548
5549 rtnl_unlock();
5550 return 0;
5551 }
5552
5553 static
5554 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5555 void __user *buffer, size_t *lenp, loff_t *ppos)
5556 {
5557 int *valp = ctl->data;
5558 int val = *valp;
5559 loff_t pos = *ppos;
5560 struct ctl_table lctl;
5561 int ret;
5562
5563 /*
5564 * ctl->data points to idev->cnf.disable_ipv6, we should
5565 * not modify it until we get the rtnl lock.
5566 */
5567 lctl = *ctl;
5568 lctl.data = &val;
5569
5570 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5571
5572 if (write)
5573 ret = addrconf_disable_ipv6(ctl, valp, val);
5574 if (ret)
5575 *ppos = pos;
5576 return ret;
5577 }
5578
5579 static
5580 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5581 void __user *buffer, size_t *lenp, loff_t *ppos)
5582 {
5583 int *valp = ctl->data;
5584 int ret;
5585 int old, new;
5586
5587 old = *valp;
5588 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5589 new = *valp;
5590
5591 if (write && old != new) {
5592 struct net *net = ctl->extra2;
5593
5594 if (!rtnl_trylock())
5595 return restart_syscall();
5596
5597 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5598 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5599 NETCONFA_IFINDEX_DEFAULT,
5600 net->ipv6.devconf_dflt);
5601 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5602 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5603 NETCONFA_IFINDEX_ALL,
5604 net->ipv6.devconf_all);
5605 else {
5606 struct inet6_dev *idev = ctl->extra1;
5607
5608 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5609 idev->dev->ifindex,
5610 &idev->cnf);
5611 }
5612 rtnl_unlock();
5613 }
5614
5615 return ret;
5616 }
5617
5618 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5619 void __user *buffer, size_t *lenp,
5620 loff_t *ppos)
5621 {
5622 int err;
5623 struct in6_addr addr;
5624 char str[IPV6_MAX_STRLEN];
5625 struct ctl_table lctl = *ctl;
5626 struct net *net = ctl->extra2;
5627 struct ipv6_stable_secret *secret = ctl->data;
5628
5629 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5630 return -EIO;
5631
5632 lctl.maxlen = IPV6_MAX_STRLEN;
5633 lctl.data = str;
5634
5635 if (!rtnl_trylock())
5636 return restart_syscall();
5637
5638 if (!write && !secret->initialized) {
5639 err = -EIO;
5640 goto out;
5641 }
5642
5643 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5644 if (err >= sizeof(str)) {
5645 err = -EIO;
5646 goto out;
5647 }
5648
5649 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5650 if (err || !write)
5651 goto out;
5652
5653 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5654 err = -EIO;
5655 goto out;
5656 }
5657
5658 secret->initialized = true;
5659 secret->secret = addr;
5660
5661 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5662 struct net_device *dev;
5663
5664 for_each_netdev(net, dev) {
5665 struct inet6_dev *idev = __in6_dev_get(dev);
5666
5667 if (idev) {
5668 idev->addr_gen_mode =
5669 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5670 }
5671 }
5672 } else {
5673 struct inet6_dev *idev = ctl->extra1;
5674
5675 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5676 }
5677
5678 out:
5679 rtnl_unlock();
5680
5681 return err;
5682 }
5683
5684 static
5685 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5686 int write,
5687 void __user *buffer,
5688 size_t *lenp,
5689 loff_t *ppos)
5690 {
5691 int *valp = ctl->data;
5692 int val = *valp;
5693 loff_t pos = *ppos;
5694 struct ctl_table lctl;
5695 int ret;
5696
5697 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5698 * we should not modify it until we get the rtnl lock.
5699 */
5700 lctl = *ctl;
5701 lctl.data = &val;
5702
5703 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5704
5705 if (write)
5706 ret = addrconf_fixup_linkdown(ctl, valp, val);
5707 if (ret)
5708 *ppos = pos;
5709 return ret;
5710 }
5711
5712 static int minus_one = -1;
5713 static const int one = 1;
5714 static const int two_five_five = 255;
5715
5716 static const struct ctl_table addrconf_sysctl[] = {
5717 {
5718 .procname = "forwarding",
5719 .data = &ipv6_devconf.forwarding,
5720 .maxlen = sizeof(int),
5721 .mode = 0644,
5722 .proc_handler = addrconf_sysctl_forward,
5723 },
5724 {
5725 .procname = "hop_limit",
5726 .data = &ipv6_devconf.hop_limit,
5727 .maxlen = sizeof(int),
5728 .mode = 0644,
5729 .proc_handler = proc_dointvec_minmax,
5730 .extra1 = (void *)&one,
5731 .extra2 = (void *)&two_five_five,
5732 },
5733 {
5734 .procname = "mtu",
5735 .data = &ipv6_devconf.mtu6,
5736 .maxlen = sizeof(int),
5737 .mode = 0644,
5738 .proc_handler = addrconf_sysctl_mtu,
5739 },
5740 {
5741 .procname = "accept_ra",
5742 .data = &ipv6_devconf.accept_ra,
5743 .maxlen = sizeof(int),
5744 .mode = 0644,
5745 .proc_handler = proc_dointvec,
5746 },
5747 {
5748 .procname = "accept_redirects",
5749 .data = &ipv6_devconf.accept_redirects,
5750 .maxlen = sizeof(int),
5751 .mode = 0644,
5752 .proc_handler = proc_dointvec,
5753 },
5754 {
5755 .procname = "autoconf",
5756 .data = &ipv6_devconf.autoconf,
5757 .maxlen = sizeof(int),
5758 .mode = 0644,
5759 .proc_handler = proc_dointvec,
5760 },
5761 {
5762 .procname = "dad_transmits",
5763 .data = &ipv6_devconf.dad_transmits,
5764 .maxlen = sizeof(int),
5765 .mode = 0644,
5766 .proc_handler = proc_dointvec,
5767 },
5768 {
5769 .procname = "router_solicitations",
5770 .data = &ipv6_devconf.rtr_solicits,
5771 .maxlen = sizeof(int),
5772 .mode = 0644,
5773 .proc_handler = proc_dointvec_minmax,
5774 .extra1 = &minus_one,
5775 },
5776 {
5777 .procname = "router_solicitation_interval",
5778 .data = &ipv6_devconf.rtr_solicit_interval,
5779 .maxlen = sizeof(int),
5780 .mode = 0644,
5781 .proc_handler = proc_dointvec_jiffies,
5782 },
5783 {
5784 .procname = "router_solicitation_max_interval",
5785 .data = &ipv6_devconf.rtr_solicit_max_interval,
5786 .maxlen = sizeof(int),
5787 .mode = 0644,
5788 .proc_handler = proc_dointvec_jiffies,
5789 },
5790 {
5791 .procname = "router_solicitation_delay",
5792 .data = &ipv6_devconf.rtr_solicit_delay,
5793 .maxlen = sizeof(int),
5794 .mode = 0644,
5795 .proc_handler = proc_dointvec_jiffies,
5796 },
5797 {
5798 .procname = "force_mld_version",
5799 .data = &ipv6_devconf.force_mld_version,
5800 .maxlen = sizeof(int),
5801 .mode = 0644,
5802 .proc_handler = proc_dointvec,
5803 },
5804 {
5805 .procname = "mldv1_unsolicited_report_interval",
5806 .data =
5807 &ipv6_devconf.mldv1_unsolicited_report_interval,
5808 .maxlen = sizeof(int),
5809 .mode = 0644,
5810 .proc_handler = proc_dointvec_ms_jiffies,
5811 },
5812 {
5813 .procname = "mldv2_unsolicited_report_interval",
5814 .data =
5815 &ipv6_devconf.mldv2_unsolicited_report_interval,
5816 .maxlen = sizeof(int),
5817 .mode = 0644,
5818 .proc_handler = proc_dointvec_ms_jiffies,
5819 },
5820 {
5821 .procname = "use_tempaddr",
5822 .data = &ipv6_devconf.use_tempaddr,
5823 .maxlen = sizeof(int),
5824 .mode = 0644,
5825 .proc_handler = proc_dointvec,
5826 },
5827 {
5828 .procname = "temp_valid_lft",
5829 .data = &ipv6_devconf.temp_valid_lft,
5830 .maxlen = sizeof(int),
5831 .mode = 0644,
5832 .proc_handler = proc_dointvec,
5833 },
5834 {
5835 .procname = "temp_prefered_lft",
5836 .data = &ipv6_devconf.temp_prefered_lft,
5837 .maxlen = sizeof(int),
5838 .mode = 0644,
5839 .proc_handler = proc_dointvec,
5840 },
5841 {
5842 .procname = "regen_max_retry",
5843 .data = &ipv6_devconf.regen_max_retry,
5844 .maxlen = sizeof(int),
5845 .mode = 0644,
5846 .proc_handler = proc_dointvec,
5847 },
5848 {
5849 .procname = "max_desync_factor",
5850 .data = &ipv6_devconf.max_desync_factor,
5851 .maxlen = sizeof(int),
5852 .mode = 0644,
5853 .proc_handler = proc_dointvec,
5854 },
5855 {
5856 .procname = "max_addresses",
5857 .data = &ipv6_devconf.max_addresses,
5858 .maxlen = sizeof(int),
5859 .mode = 0644,
5860 .proc_handler = proc_dointvec,
5861 },
5862 {
5863 .procname = "accept_ra_defrtr",
5864 .data = &ipv6_devconf.accept_ra_defrtr,
5865 .maxlen = sizeof(int),
5866 .mode = 0644,
5867 .proc_handler = proc_dointvec,
5868 },
5869 {
5870 .procname = "accept_ra_min_hop_limit",
5871 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5872 .maxlen = sizeof(int),
5873 .mode = 0644,
5874 .proc_handler = proc_dointvec,
5875 },
5876 {
5877 .procname = "accept_ra_pinfo",
5878 .data = &ipv6_devconf.accept_ra_pinfo,
5879 .maxlen = sizeof(int),
5880 .mode = 0644,
5881 .proc_handler = proc_dointvec,
5882 },
5883 #ifdef CONFIG_IPV6_ROUTER_PREF
5884 {
5885 .procname = "accept_ra_rtr_pref",
5886 .data = &ipv6_devconf.accept_ra_rtr_pref,
5887 .maxlen = sizeof(int),
5888 .mode = 0644,
5889 .proc_handler = proc_dointvec,
5890 },
5891 {
5892 .procname = "router_probe_interval",
5893 .data = &ipv6_devconf.rtr_probe_interval,
5894 .maxlen = sizeof(int),
5895 .mode = 0644,
5896 .proc_handler = proc_dointvec_jiffies,
5897 },
5898 #ifdef CONFIG_IPV6_ROUTE_INFO
5899 {
5900 .procname = "accept_ra_rt_info_max_plen",
5901 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5902 .maxlen = sizeof(int),
5903 .mode = 0644,
5904 .proc_handler = proc_dointvec,
5905 },
5906 #endif
5907 #endif
5908 {
5909 .procname = "proxy_ndp",
5910 .data = &ipv6_devconf.proxy_ndp,
5911 .maxlen = sizeof(int),
5912 .mode = 0644,
5913 .proc_handler = addrconf_sysctl_proxy_ndp,
5914 },
5915 {
5916 .procname = "accept_source_route",
5917 .data = &ipv6_devconf.accept_source_route,
5918 .maxlen = sizeof(int),
5919 .mode = 0644,
5920 .proc_handler = proc_dointvec,
5921 },
5922 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5923 {
5924 .procname = "optimistic_dad",
5925 .data = &ipv6_devconf.optimistic_dad,
5926 .maxlen = sizeof(int),
5927 .mode = 0644,
5928 .proc_handler = proc_dointvec,
5929 },
5930 {
5931 .procname = "use_optimistic",
5932 .data = &ipv6_devconf.use_optimistic,
5933 .maxlen = sizeof(int),
5934 .mode = 0644,
5935 .proc_handler = proc_dointvec,
5936 },
5937 #endif
5938 #ifdef CONFIG_IPV6_MROUTE
5939 {
5940 .procname = "mc_forwarding",
5941 .data = &ipv6_devconf.mc_forwarding,
5942 .maxlen = sizeof(int),
5943 .mode = 0444,
5944 .proc_handler = proc_dointvec,
5945 },
5946 #endif
5947 {
5948 .procname = "disable_ipv6",
5949 .data = &ipv6_devconf.disable_ipv6,
5950 .maxlen = sizeof(int),
5951 .mode = 0644,
5952 .proc_handler = addrconf_sysctl_disable,
5953 },
5954 {
5955 .procname = "accept_dad",
5956 .data = &ipv6_devconf.accept_dad,
5957 .maxlen = sizeof(int),
5958 .mode = 0644,
5959 .proc_handler = proc_dointvec,
5960 },
5961 {
5962 .procname = "force_tllao",
5963 .data = &ipv6_devconf.force_tllao,
5964 .maxlen = sizeof(int),
5965 .mode = 0644,
5966 .proc_handler = proc_dointvec
5967 },
5968 {
5969 .procname = "ndisc_notify",
5970 .data = &ipv6_devconf.ndisc_notify,
5971 .maxlen = sizeof(int),
5972 .mode = 0644,
5973 .proc_handler = proc_dointvec
5974 },
5975 {
5976 .procname = "suppress_frag_ndisc",
5977 .data = &ipv6_devconf.suppress_frag_ndisc,
5978 .maxlen = sizeof(int),
5979 .mode = 0644,
5980 .proc_handler = proc_dointvec
5981 },
5982 {
5983 .procname = "accept_ra_from_local",
5984 .data = &ipv6_devconf.accept_ra_from_local,
5985 .maxlen = sizeof(int),
5986 .mode = 0644,
5987 .proc_handler = proc_dointvec,
5988 },
5989 {
5990 .procname = "accept_ra_mtu",
5991 .data = &ipv6_devconf.accept_ra_mtu,
5992 .maxlen = sizeof(int),
5993 .mode = 0644,
5994 .proc_handler = proc_dointvec,
5995 },
5996 {
5997 .procname = "stable_secret",
5998 .data = &ipv6_devconf.stable_secret,
5999 .maxlen = IPV6_MAX_STRLEN,
6000 .mode = 0600,
6001 .proc_handler = addrconf_sysctl_stable_secret,
6002 },
6003 {
6004 .procname = "use_oif_addrs_only",
6005 .data = &ipv6_devconf.use_oif_addrs_only,
6006 .maxlen = sizeof(int),
6007 .mode = 0644,
6008 .proc_handler = proc_dointvec,
6009 },
6010 {
6011 .procname = "ignore_routes_with_linkdown",
6012 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6013 .maxlen = sizeof(int),
6014 .mode = 0644,
6015 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6016 },
6017 {
6018 .procname = "drop_unicast_in_l2_multicast",
6019 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6020 .maxlen = sizeof(int),
6021 .mode = 0644,
6022 .proc_handler = proc_dointvec,
6023 },
6024 {
6025 .procname = "drop_unsolicited_na",
6026 .data = &ipv6_devconf.drop_unsolicited_na,
6027 .maxlen = sizeof(int),
6028 .mode = 0644,
6029 .proc_handler = proc_dointvec,
6030 },
6031 {
6032 .procname = "keep_addr_on_down",
6033 .data = &ipv6_devconf.keep_addr_on_down,
6034 .maxlen = sizeof(int),
6035 .mode = 0644,
6036 .proc_handler = proc_dointvec,
6037
6038 },
6039 {
6040 /* sentinel */
6041 }
6042 };
6043
6044 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6045 struct inet6_dev *idev, struct ipv6_devconf *p)
6046 {
6047 int i, ifindex;
6048 struct ctl_table *table;
6049 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6050
6051 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6052 if (!table)
6053 goto out;
6054
6055 for (i = 0; table[i].data; i++) {
6056 table[i].data += (char *)p - (char *)&ipv6_devconf;
6057 /* If one of these is already set, then it is not safe to
6058 * overwrite either of them: this makes proc_dointvec_minmax
6059 * usable.
6060 */
6061 if (!table[i].extra1 && !table[i].extra2) {
6062 table[i].extra1 = idev; /* embedded; no ref */
6063 table[i].extra2 = net;
6064 }
6065 }
6066
6067 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6068
6069 p->sysctl_header = register_net_sysctl(net, path, table);
6070 if (!p->sysctl_header)
6071 goto free;
6072
6073 if (!strcmp(dev_name, "all"))
6074 ifindex = NETCONFA_IFINDEX_ALL;
6075 else if (!strcmp(dev_name, "default"))
6076 ifindex = NETCONFA_IFINDEX_DEFAULT;
6077 else
6078 ifindex = idev->dev->ifindex;
6079 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
6080 return 0;
6081
6082 free:
6083 kfree(table);
6084 out:
6085 return -ENOBUFS;
6086 }
6087
6088 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6089 {
6090 struct ctl_table *table;
6091
6092 if (!p->sysctl_header)
6093 return;
6094
6095 table = p->sysctl_header->ctl_table_arg;
6096 unregister_net_sysctl_table(p->sysctl_header);
6097 p->sysctl_header = NULL;
6098 kfree(table);
6099 }
6100
6101 static int addrconf_sysctl_register(struct inet6_dev *idev)
6102 {
6103 int err;
6104
6105 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6106 return -EINVAL;
6107
6108 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6109 &ndisc_ifinfo_sysctl_change);
6110 if (err)
6111 return err;
6112 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6113 idev, &idev->cnf);
6114 if (err)
6115 neigh_sysctl_unregister(idev->nd_parms);
6116
6117 return err;
6118 }
6119
6120 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6121 {
6122 __addrconf_sysctl_unregister(&idev->cnf);
6123 neigh_sysctl_unregister(idev->nd_parms);
6124 }
6125
6126
6127 #endif
6128
6129 static int __net_init addrconf_init_net(struct net *net)
6130 {
6131 int err = -ENOMEM;
6132 struct ipv6_devconf *all, *dflt;
6133
6134 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6135 if (!all)
6136 goto err_alloc_all;
6137
6138 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6139 if (!dflt)
6140 goto err_alloc_dflt;
6141
6142 /* these will be inherited by all namespaces */
6143 dflt->autoconf = ipv6_defaults.autoconf;
6144 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6145
6146 dflt->stable_secret.initialized = false;
6147 all->stable_secret.initialized = false;
6148
6149 net->ipv6.devconf_all = all;
6150 net->ipv6.devconf_dflt = dflt;
6151
6152 #ifdef CONFIG_SYSCTL
6153 err = __addrconf_sysctl_register(net, "all", NULL, all);
6154 if (err < 0)
6155 goto err_reg_all;
6156
6157 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6158 if (err < 0)
6159 goto err_reg_dflt;
6160 #endif
6161 return 0;
6162
6163 #ifdef CONFIG_SYSCTL
6164 err_reg_dflt:
6165 __addrconf_sysctl_unregister(all);
6166 err_reg_all:
6167 kfree(dflt);
6168 #endif
6169 err_alloc_dflt:
6170 kfree(all);
6171 err_alloc_all:
6172 return err;
6173 }
6174
6175 static void __net_exit addrconf_exit_net(struct net *net)
6176 {
6177 #ifdef CONFIG_SYSCTL
6178 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6179 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6180 #endif
6181 kfree(net->ipv6.devconf_dflt);
6182 kfree(net->ipv6.devconf_all);
6183 }
6184
6185 static struct pernet_operations addrconf_ops = {
6186 .init = addrconf_init_net,
6187 .exit = addrconf_exit_net,
6188 };
6189
6190 static struct rtnl_af_ops inet6_ops __read_mostly = {
6191 .family = AF_INET6,
6192 .fill_link_af = inet6_fill_link_af,
6193 .get_link_af_size = inet6_get_link_af_size,
6194 .validate_link_af = inet6_validate_link_af,
6195 .set_link_af = inet6_set_link_af,
6196 };
6197
6198 /*
6199 * Init / cleanup code
6200 */
6201
6202 int __init addrconf_init(void)
6203 {
6204 struct inet6_dev *idev;
6205 int i, err;
6206
6207 err = ipv6_addr_label_init();
6208 if (err < 0) {
6209 pr_crit("%s: cannot initialize default policy table: %d\n",
6210 __func__, err);
6211 goto out;
6212 }
6213
6214 err = register_pernet_subsys(&addrconf_ops);
6215 if (err < 0)
6216 goto out_addrlabel;
6217
6218 addrconf_wq = create_workqueue("ipv6_addrconf");
6219 if (!addrconf_wq) {
6220 err = -ENOMEM;
6221 goto out_nowq;
6222 }
6223
6224 /* The addrconf netdev notifier requires that loopback_dev
6225 * has it's ipv6 private information allocated and setup
6226 * before it can bring up and give link-local addresses
6227 * to other devices which are up.
6228 *
6229 * Unfortunately, loopback_dev is not necessarily the first
6230 * entry in the global dev_base list of net devices. In fact,
6231 * it is likely to be the very last entry on that list.
6232 * So this causes the notifier registry below to try and
6233 * give link-local addresses to all devices besides loopback_dev
6234 * first, then loopback_dev, which cases all the non-loopback_dev
6235 * devices to fail to get a link-local address.
6236 *
6237 * So, as a temporary fix, allocate the ipv6 structure for
6238 * loopback_dev first by hand.
6239 * Longer term, all of the dependencies ipv6 has upon the loopback
6240 * device and it being up should be removed.
6241 */
6242 rtnl_lock();
6243 idev = ipv6_add_dev(init_net.loopback_dev);
6244 rtnl_unlock();
6245 if (IS_ERR(idev)) {
6246 err = PTR_ERR(idev);
6247 goto errlo;
6248 }
6249
6250 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6251 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6252
6253 register_netdevice_notifier(&ipv6_dev_notf);
6254
6255 addrconf_verify();
6256
6257 rtnl_af_register(&inet6_ops);
6258
6259 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6260 NULL);
6261 if (err < 0)
6262 goto errout;
6263
6264 /* Only the first call to __rtnl_register can fail */
6265 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6266 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6267 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6268 inet6_dump_ifaddr, NULL);
6269 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6270 inet6_dump_ifmcaddr, NULL);
6271 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6272 inet6_dump_ifacaddr, NULL);
6273 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6274 inet6_netconf_dump_devconf, NULL);
6275
6276 ipv6_addr_label_rtnl_register();
6277
6278 return 0;
6279 errout:
6280 rtnl_af_unregister(&inet6_ops);
6281 unregister_netdevice_notifier(&ipv6_dev_notf);
6282 errlo:
6283 destroy_workqueue(addrconf_wq);
6284 out_nowq:
6285 unregister_pernet_subsys(&addrconf_ops);
6286 out_addrlabel:
6287 ipv6_addr_label_cleanup();
6288 out:
6289 return err;
6290 }
6291
6292 void addrconf_cleanup(void)
6293 {
6294 struct net_device *dev;
6295 int i;
6296
6297 unregister_netdevice_notifier(&ipv6_dev_notf);
6298 unregister_pernet_subsys(&addrconf_ops);
6299 ipv6_addr_label_cleanup();
6300
6301 rtnl_lock();
6302
6303 __rtnl_af_unregister(&inet6_ops);
6304
6305 /* clean dev list */
6306 for_each_netdev(&init_net, dev) {
6307 if (__in6_dev_get(dev) == NULL)
6308 continue;
6309 addrconf_ifdown(dev, 1);
6310 }
6311 addrconf_ifdown(init_net.loopback_dev, 2);
6312
6313 /*
6314 * Check hash table.
6315 */
6316 spin_lock_bh(&addrconf_hash_lock);
6317 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6318 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6319 spin_unlock_bh(&addrconf_hash_lock);
6320 cancel_delayed_work(&addr_chk_work);
6321 rtnl_unlock();
6322
6323 destroy_workqueue(addrconf_wq);
6324 }
ubuntu-bionic-kernel mirror