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[mirror_ubuntu-artful-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/sched/signal.h>
47 #include <linux/socket.h>
48 #include <linux/sockios.h>
49 #include <linux/net.h>
50 #include <linux/inet.h>
51 #include <linux/in6.h>
52 #include <linux/netdevice.h>
53 #include <linux/if_addr.h>
54 #include <linux/if_arp.h>
55 #include <linux/if_arcnet.h>
56 #include <linux/if_infiniband.h>
57 #include <linux/route.h>
58 #include <linux/inetdevice.h>
59 #include <linux/init.h>
60 #include <linux/slab.h>
61 #ifdef CONFIG_SYSCTL
62 #include <linux/sysctl.h>
63 #endif
64 #include <linux/capability.h>
65 #include <linux/delay.h>
66 #include <linux/notifier.h>
67 #include <linux/string.h>
68 #include <linux/hash.h>
69
70 #include <net/net_namespace.h>
71 #include <net/sock.h>
72 #include <net/snmp.h>
73
74 #include <net/6lowpan.h>
75 #include <net/firewire.h>
76 #include <net/ipv6.h>
77 #include <net/protocol.h>
78 #include <net/ndisc.h>
79 #include <net/ip6_route.h>
80 #include <net/addrconf.h>
81 #include <net/tcp.h>
82 #include <net/ip.h>
83 #include <net/netlink.h>
84 #include <net/pkt_sched.h>
85 #include <net/l3mdev.h>
86 #include <linux/if_tunnel.h>
87 #include <linux/rtnetlink.h>
88 #include <linux/netconf.h>
89 #include <linux/random.h>
90 #include <linux/uaccess.h>
91 #include <asm/unaligned.h>
92
93 #include <linux/proc_fs.h>
94 #include <linux/seq_file.h>
95 #include <linux/export.h>
96
97 /* Set to 3 to get tracing... */
98 #define ACONF_DEBUG 2
99
100 #if ACONF_DEBUG >= 3
101 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
102 #else
103 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
104 #endif
105
106 #define INFINITY_LIFE_TIME 0xFFFFFFFF
107
108 #define IPV6_MAX_STRLEN \
109 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
110
111 static inline u32 cstamp_delta(unsigned long cstamp)
112 {
113 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
114 }
115
116 static inline s32 rfc3315_s14_backoff_init(s32 irt)
117 {
118 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
119 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
120 do_div(tmp, 1000000);
121 return (s32)tmp;
122 }
123
124 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
125 {
126 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
127 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
128 do_div(tmp, 1000000);
129 if ((s32)tmp > mrt) {
130 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
131 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
132 do_div(tmp, 1000000);
133 }
134 return (s32)tmp;
135 }
136
137 #ifdef CONFIG_SYSCTL
138 static int addrconf_sysctl_register(struct inet6_dev *idev);
139 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
140 #else
141 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
142 {
143 return 0;
144 }
145
146 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
147 {
148 }
149 #endif
150
151 static void ipv6_regen_rndid(struct inet6_dev *idev);
152 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
153
154 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
155 static int ipv6_count_addresses(struct inet6_dev *idev);
156 static int ipv6_generate_stable_address(struct in6_addr *addr,
157 u8 dad_count,
158 const struct inet6_dev *idev);
159
160 /*
161 * Configured unicast address hash table
162 */
163 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
164 static DEFINE_SPINLOCK(addrconf_hash_lock);
165
166 static void addrconf_verify(void);
167 static void addrconf_verify_rtnl(void);
168 static void addrconf_verify_work(struct work_struct *);
169
170 static struct workqueue_struct *addrconf_wq;
171 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
172
173 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
174 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
175
176 static void addrconf_type_change(struct net_device *dev,
177 unsigned long event);
178 static int addrconf_ifdown(struct net_device *dev, int how);
179
180 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
181 int plen,
182 const struct net_device *dev,
183 u32 flags, u32 noflags);
184
185 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
186 static void addrconf_dad_work(struct work_struct *w);
187 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
188 static void addrconf_dad_run(struct inet6_dev *idev);
189 static void addrconf_rs_timer(unsigned long data);
190 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
192
193 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
194 struct prefix_info *pinfo);
195 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
196 struct net_device *dev);
197
198 static struct ipv6_devconf ipv6_devconf __read_mostly = {
199 .forwarding = 0,
200 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
201 .mtu6 = IPV6_MIN_MTU,
202 .accept_ra = 1,
203 .accept_redirects = 1,
204 .autoconf = 1,
205 .force_mld_version = 0,
206 .mldv1_unsolicited_report_interval = 10 * HZ,
207 .mldv2_unsolicited_report_interval = HZ,
208 .dad_transmits = 1,
209 .rtr_solicits = MAX_RTR_SOLICITATIONS,
210 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
211 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
212 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
213 .use_tempaddr = 0,
214 .temp_valid_lft = TEMP_VALID_LIFETIME,
215 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
216 .regen_max_retry = REGEN_MAX_RETRY,
217 .max_desync_factor = MAX_DESYNC_FACTOR,
218 .max_addresses = IPV6_MAX_ADDRESSES,
219 .accept_ra_defrtr = 1,
220 .accept_ra_from_local = 0,
221 .accept_ra_min_hop_limit= 1,
222 .accept_ra_pinfo = 1,
223 #ifdef CONFIG_IPV6_ROUTER_PREF
224 .accept_ra_rtr_pref = 1,
225 .rtr_probe_interval = 60 * HZ,
226 #ifdef CONFIG_IPV6_ROUTE_INFO
227 .accept_ra_rt_info_min_plen = 0,
228 .accept_ra_rt_info_max_plen = 0,
229 #endif
230 #endif
231 .proxy_ndp = 0,
232 .accept_source_route = 0, /* we do not accept RH0 by default. */
233 .disable_ipv6 = 0,
234 .accept_dad = 1,
235 .suppress_frag_ndisc = 1,
236 .accept_ra_mtu = 1,
237 .stable_secret = {
238 .initialized = false,
239 },
240 .use_oif_addrs_only = 0,
241 .ignore_routes_with_linkdown = 0,
242 .keep_addr_on_down = 0,
243 .seg6_enabled = 0,
244 #ifdef CONFIG_IPV6_SEG6_HMAC
245 .seg6_require_hmac = 0,
246 #endif
247 .enhanced_dad = 1,
248 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
249 .disable_policy = 0,
250 };
251
252 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
253 .forwarding = 0,
254 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
255 .mtu6 = IPV6_MIN_MTU,
256 .accept_ra = 1,
257 .accept_redirects = 1,
258 .autoconf = 1,
259 .force_mld_version = 0,
260 .mldv1_unsolicited_report_interval = 10 * HZ,
261 .mldv2_unsolicited_report_interval = HZ,
262 .dad_transmits = 1,
263 .rtr_solicits = MAX_RTR_SOLICITATIONS,
264 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
265 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
266 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
267 .use_tempaddr = 0,
268 .temp_valid_lft = TEMP_VALID_LIFETIME,
269 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
270 .regen_max_retry = REGEN_MAX_RETRY,
271 .max_desync_factor = MAX_DESYNC_FACTOR,
272 .max_addresses = IPV6_MAX_ADDRESSES,
273 .accept_ra_defrtr = 1,
274 .accept_ra_from_local = 0,
275 .accept_ra_min_hop_limit= 1,
276 .accept_ra_pinfo = 1,
277 #ifdef CONFIG_IPV6_ROUTER_PREF
278 .accept_ra_rtr_pref = 1,
279 .rtr_probe_interval = 60 * HZ,
280 #ifdef CONFIG_IPV6_ROUTE_INFO
281 .accept_ra_rt_info_min_plen = 0,
282 .accept_ra_rt_info_max_plen = 0,
283 #endif
284 #endif
285 .proxy_ndp = 0,
286 .accept_source_route = 0, /* we do not accept RH0 by default. */
287 .disable_ipv6 = 0,
288 .accept_dad = 1,
289 .suppress_frag_ndisc = 1,
290 .accept_ra_mtu = 1,
291 .stable_secret = {
292 .initialized = false,
293 },
294 .use_oif_addrs_only = 0,
295 .ignore_routes_with_linkdown = 0,
296 .keep_addr_on_down = 0,
297 .seg6_enabled = 0,
298 #ifdef CONFIG_IPV6_SEG6_HMAC
299 .seg6_require_hmac = 0,
300 #endif
301 .enhanced_dad = 1,
302 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
303 .disable_policy = 0,
304 };
305
306 /* Check if a valid qdisc is available */
307 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
308 {
309 return !qdisc_tx_is_noop(dev);
310 }
311
312 static void addrconf_del_rs_timer(struct inet6_dev *idev)
313 {
314 if (del_timer(&idev->rs_timer))
315 __in6_dev_put(idev);
316 }
317
318 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
319 {
320 if (cancel_delayed_work(&ifp->dad_work))
321 __in6_ifa_put(ifp);
322 }
323
324 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
325 unsigned long when)
326 {
327 if (!timer_pending(&idev->rs_timer))
328 in6_dev_hold(idev);
329 mod_timer(&idev->rs_timer, jiffies + when);
330 }
331
332 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
333 unsigned long delay)
334 {
335 if (!delayed_work_pending(&ifp->dad_work))
336 in6_ifa_hold(ifp);
337 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
338 }
339
340 static int snmp6_alloc_dev(struct inet6_dev *idev)
341 {
342 int i;
343
344 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
345 if (!idev->stats.ipv6)
346 goto err_ip;
347
348 for_each_possible_cpu(i) {
349 struct ipstats_mib *addrconf_stats;
350 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
351 u64_stats_init(&addrconf_stats->syncp);
352 }
353
354
355 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
356 GFP_KERNEL);
357 if (!idev->stats.icmpv6dev)
358 goto err_icmp;
359 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
360 GFP_KERNEL);
361 if (!idev->stats.icmpv6msgdev)
362 goto err_icmpmsg;
363
364 return 0;
365
366 err_icmpmsg:
367 kfree(idev->stats.icmpv6dev);
368 err_icmp:
369 free_percpu(idev->stats.ipv6);
370 err_ip:
371 return -ENOMEM;
372 }
373
374 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
375 {
376 struct inet6_dev *ndev;
377 int err = -ENOMEM;
378
379 ASSERT_RTNL();
380
381 if (dev->mtu < IPV6_MIN_MTU)
382 return ERR_PTR(-EINVAL);
383
384 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
385 if (!ndev)
386 return ERR_PTR(err);
387
388 rwlock_init(&ndev->lock);
389 ndev->dev = dev;
390 INIT_LIST_HEAD(&ndev->addr_list);
391 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
392 (unsigned long)ndev);
393 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
394
395 if (ndev->cnf.stable_secret.initialized)
396 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
397 else
398 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
399
400 ndev->cnf.mtu6 = dev->mtu;
401 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
402 if (!ndev->nd_parms) {
403 kfree(ndev);
404 return ERR_PTR(err);
405 }
406 if (ndev->cnf.forwarding)
407 dev_disable_lro(dev);
408 /* We refer to the device */
409 dev_hold(dev);
410
411 if (snmp6_alloc_dev(ndev) < 0) {
412 ADBG(KERN_WARNING
413 "%s: cannot allocate memory for statistics; dev=%s.\n",
414 __func__, dev->name);
415 neigh_parms_release(&nd_tbl, ndev->nd_parms);
416 dev_put(dev);
417 kfree(ndev);
418 return ERR_PTR(err);
419 }
420
421 if (snmp6_register_dev(ndev) < 0) {
422 ADBG(KERN_WARNING
423 "%s: cannot create /proc/net/dev_snmp6/%s\n",
424 __func__, dev->name);
425 goto err_release;
426 }
427
428 /* One reference from device. */
429 in6_dev_hold(ndev);
430
431 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
432 ndev->cnf.accept_dad = -1;
433
434 #if IS_ENABLED(CONFIG_IPV6_SIT)
435 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
436 pr_info("%s: Disabled Multicast RS\n", dev->name);
437 ndev->cnf.rtr_solicits = 0;
438 }
439 #endif
440
441 INIT_LIST_HEAD(&ndev->tempaddr_list);
442 ndev->desync_factor = U32_MAX;
443 if ((dev->flags&IFF_LOOPBACK) ||
444 dev->type == ARPHRD_TUNNEL ||
445 dev->type == ARPHRD_TUNNEL6 ||
446 dev->type == ARPHRD_SIT ||
447 dev->type == ARPHRD_NONE) {
448 ndev->cnf.use_tempaddr = -1;
449 } else
450 ipv6_regen_rndid(ndev);
451
452 ndev->token = in6addr_any;
453
454 if (netif_running(dev) && addrconf_qdisc_ok(dev))
455 ndev->if_flags |= IF_READY;
456
457 ipv6_mc_init_dev(ndev);
458 ndev->tstamp = jiffies;
459 err = addrconf_sysctl_register(ndev);
460 if (err) {
461 ipv6_mc_destroy_dev(ndev);
462 snmp6_unregister_dev(ndev);
463 goto err_release;
464 }
465 /* protected by rtnl_lock */
466 rcu_assign_pointer(dev->ip6_ptr, ndev);
467
468 /* Join interface-local all-node multicast group */
469 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
470
471 /* Join all-node multicast group */
472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
473
474 /* Join all-router multicast group if forwarding is set */
475 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
476 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
477
478 return ndev;
479
480 err_release:
481 neigh_parms_release(&nd_tbl, ndev->nd_parms);
482 ndev->dead = 1;
483 in6_dev_finish_destroy(ndev);
484 return ERR_PTR(err);
485 }
486
487 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
488 {
489 struct inet6_dev *idev;
490
491 ASSERT_RTNL();
492
493 idev = __in6_dev_get(dev);
494 if (!idev) {
495 idev = ipv6_add_dev(dev);
496 if (IS_ERR(idev))
497 return NULL;
498 }
499
500 if (dev->flags&IFF_UP)
501 ipv6_mc_up(idev);
502 return idev;
503 }
504
505 static int inet6_netconf_msgsize_devconf(int type)
506 {
507 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
508 + nla_total_size(4); /* NETCONFA_IFINDEX */
509 bool all = false;
510
511 if (type == NETCONFA_ALL)
512 all = true;
513
514 if (all || type == NETCONFA_FORWARDING)
515 size += nla_total_size(4);
516 #ifdef CONFIG_IPV6_MROUTE
517 if (all || type == NETCONFA_MC_FORWARDING)
518 size += nla_total_size(4);
519 #endif
520 if (all || type == NETCONFA_PROXY_NEIGH)
521 size += nla_total_size(4);
522
523 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
524 size += nla_total_size(4);
525
526 return size;
527 }
528
529 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
530 struct ipv6_devconf *devconf, u32 portid,
531 u32 seq, int event, unsigned int flags,
532 int type)
533 {
534 struct nlmsghdr *nlh;
535 struct netconfmsg *ncm;
536 bool all = false;
537
538 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
539 flags);
540 if (!nlh)
541 return -EMSGSIZE;
542
543 if (type == NETCONFA_ALL)
544 all = true;
545
546 ncm = nlmsg_data(nlh);
547 ncm->ncm_family = AF_INET6;
548
549 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
550 goto nla_put_failure;
551
552 if (!devconf)
553 goto out;
554
555 if ((all || type == NETCONFA_FORWARDING) &&
556 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
557 goto nla_put_failure;
558 #ifdef CONFIG_IPV6_MROUTE
559 if ((all || type == NETCONFA_MC_FORWARDING) &&
560 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
561 devconf->mc_forwarding) < 0)
562 goto nla_put_failure;
563 #endif
564 if ((all || type == NETCONFA_PROXY_NEIGH) &&
565 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
566 goto nla_put_failure;
567
568 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
569 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
570 devconf->ignore_routes_with_linkdown) < 0)
571 goto nla_put_failure;
572
573 out:
574 nlmsg_end(skb, nlh);
575 return 0;
576
577 nla_put_failure:
578 nlmsg_cancel(skb, nlh);
579 return -EMSGSIZE;
580 }
581
582 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
583 int ifindex, struct ipv6_devconf *devconf)
584 {
585 struct sk_buff *skb;
586 int err = -ENOBUFS;
587
588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
589 if (!skb)
590 goto errout;
591
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
593 event, 0, type);
594 if (err < 0) {
595 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
596 WARN_ON(err == -EMSGSIZE);
597 kfree_skb(skb);
598 goto errout;
599 }
600 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
601 return;
602 errout:
603 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
604 }
605
606 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
607 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
608 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
609 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
610 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
611 };
612
613 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
614 struct nlmsghdr *nlh,
615 struct netlink_ext_ack *extack)
616 {
617 struct net *net = sock_net(in_skb->sk);
618 struct nlattr *tb[NETCONFA_MAX+1];
619 struct netconfmsg *ncm;
620 struct sk_buff *skb;
621 struct ipv6_devconf *devconf;
622 struct inet6_dev *in6_dev;
623 struct net_device *dev;
624 int ifindex;
625 int err;
626
627 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
628 devconf_ipv6_policy, extack);
629 if (err < 0)
630 goto errout;
631
632 err = -EINVAL;
633 if (!tb[NETCONFA_IFINDEX])
634 goto errout;
635
636 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
637 switch (ifindex) {
638 case NETCONFA_IFINDEX_ALL:
639 devconf = net->ipv6.devconf_all;
640 break;
641 case NETCONFA_IFINDEX_DEFAULT:
642 devconf = net->ipv6.devconf_dflt;
643 break;
644 default:
645 dev = __dev_get_by_index(net, ifindex);
646 if (!dev)
647 goto errout;
648 in6_dev = __in6_dev_get(dev);
649 if (!in6_dev)
650 goto errout;
651 devconf = &in6_dev->cnf;
652 break;
653 }
654
655 err = -ENOBUFS;
656 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
657 if (!skb)
658 goto errout;
659
660 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
661 NETLINK_CB(in_skb).portid,
662 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
663 NETCONFA_ALL);
664 if (err < 0) {
665 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
666 WARN_ON(err == -EMSGSIZE);
667 kfree_skb(skb);
668 goto errout;
669 }
670 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
671 errout:
672 return err;
673 }
674
675 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
676 struct netlink_callback *cb)
677 {
678 struct net *net = sock_net(skb->sk);
679 int h, s_h;
680 int idx, s_idx;
681 struct net_device *dev;
682 struct inet6_dev *idev;
683 struct hlist_head *head;
684
685 s_h = cb->args[0];
686 s_idx = idx = cb->args[1];
687
688 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
689 idx = 0;
690 head = &net->dev_index_head[h];
691 rcu_read_lock();
692 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
693 net->dev_base_seq;
694 hlist_for_each_entry_rcu(dev, head, index_hlist) {
695 if (idx < s_idx)
696 goto cont;
697 idev = __in6_dev_get(dev);
698 if (!idev)
699 goto cont;
700
701 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
702 &idev->cnf,
703 NETLINK_CB(cb->skb).portid,
704 cb->nlh->nlmsg_seq,
705 RTM_NEWNETCONF,
706 NLM_F_MULTI,
707 NETCONFA_ALL) < 0) {
708 rcu_read_unlock();
709 goto done;
710 }
711 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
712 cont:
713 idx++;
714 }
715 rcu_read_unlock();
716 }
717 if (h == NETDEV_HASHENTRIES) {
718 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
719 net->ipv6.devconf_all,
720 NETLINK_CB(cb->skb).portid,
721 cb->nlh->nlmsg_seq,
722 RTM_NEWNETCONF, NLM_F_MULTI,
723 NETCONFA_ALL) < 0)
724 goto done;
725 else
726 h++;
727 }
728 if (h == NETDEV_HASHENTRIES + 1) {
729 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
730 net->ipv6.devconf_dflt,
731 NETLINK_CB(cb->skb).portid,
732 cb->nlh->nlmsg_seq,
733 RTM_NEWNETCONF, NLM_F_MULTI,
734 NETCONFA_ALL) < 0)
735 goto done;
736 else
737 h++;
738 }
739 done:
740 cb->args[0] = h;
741 cb->args[1] = idx;
742
743 return skb->len;
744 }
745
746 #ifdef CONFIG_SYSCTL
747 static void dev_forward_change(struct inet6_dev *idev)
748 {
749 struct net_device *dev;
750 struct inet6_ifaddr *ifa;
751
752 if (!idev)
753 return;
754 dev = idev->dev;
755 if (idev->cnf.forwarding)
756 dev_disable_lro(dev);
757 if (dev->flags & IFF_MULTICAST) {
758 if (idev->cnf.forwarding) {
759 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
760 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
761 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
762 } else {
763 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
764 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
765 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
766 }
767 }
768
769 list_for_each_entry(ifa, &idev->addr_list, if_list) {
770 if (ifa->flags&IFA_F_TENTATIVE)
771 continue;
772 if (idev->cnf.forwarding)
773 addrconf_join_anycast(ifa);
774 else
775 addrconf_leave_anycast(ifa);
776 }
777 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
778 NETCONFA_FORWARDING,
779 dev->ifindex, &idev->cnf);
780 }
781
782
783 static void addrconf_forward_change(struct net *net, __s32 newf)
784 {
785 struct net_device *dev;
786 struct inet6_dev *idev;
787
788 for_each_netdev(net, dev) {
789 idev = __in6_dev_get(dev);
790 if (idev) {
791 int changed = (!idev->cnf.forwarding) ^ (!newf);
792 idev->cnf.forwarding = newf;
793 if (changed)
794 dev_forward_change(idev);
795 }
796 }
797 }
798
799 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
800 {
801 struct net *net;
802 int old;
803
804 if (!rtnl_trylock())
805 return restart_syscall();
806
807 net = (struct net *)table->extra2;
808 old = *p;
809 *p = newf;
810
811 if (p == &net->ipv6.devconf_dflt->forwarding) {
812 if ((!newf) ^ (!old))
813 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
814 NETCONFA_FORWARDING,
815 NETCONFA_IFINDEX_DEFAULT,
816 net->ipv6.devconf_dflt);
817 rtnl_unlock();
818 return 0;
819 }
820
821 if (p == &net->ipv6.devconf_all->forwarding) {
822 int old_dflt = net->ipv6.devconf_dflt->forwarding;
823
824 net->ipv6.devconf_dflt->forwarding = newf;
825 if ((!newf) ^ (!old_dflt))
826 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
827 NETCONFA_FORWARDING,
828 NETCONFA_IFINDEX_DEFAULT,
829 net->ipv6.devconf_dflt);
830
831 addrconf_forward_change(net, newf);
832 if ((!newf) ^ (!old))
833 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
834 NETCONFA_FORWARDING,
835 NETCONFA_IFINDEX_ALL,
836 net->ipv6.devconf_all);
837 } else if ((!newf) ^ (!old))
838 dev_forward_change((struct inet6_dev *)table->extra1);
839 rtnl_unlock();
840
841 if (newf)
842 rt6_purge_dflt_routers(net);
843 return 1;
844 }
845
846 static void addrconf_linkdown_change(struct net *net, __s32 newf)
847 {
848 struct net_device *dev;
849 struct inet6_dev *idev;
850
851 for_each_netdev(net, dev) {
852 idev = __in6_dev_get(dev);
853 if (idev) {
854 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
855
856 idev->cnf.ignore_routes_with_linkdown = newf;
857 if (changed)
858 inet6_netconf_notify_devconf(dev_net(dev),
859 RTM_NEWNETCONF,
860 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
861 dev->ifindex,
862 &idev->cnf);
863 }
864 }
865 }
866
867 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
868 {
869 struct net *net;
870 int old;
871
872 if (!rtnl_trylock())
873 return restart_syscall();
874
875 net = (struct net *)table->extra2;
876 old = *p;
877 *p = newf;
878
879 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
880 if ((!newf) ^ (!old))
881 inet6_netconf_notify_devconf(net,
882 RTM_NEWNETCONF,
883 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
884 NETCONFA_IFINDEX_DEFAULT,
885 net->ipv6.devconf_dflt);
886 rtnl_unlock();
887 return 0;
888 }
889
890 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
891 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
892 addrconf_linkdown_change(net, newf);
893 if ((!newf) ^ (!old))
894 inet6_netconf_notify_devconf(net,
895 RTM_NEWNETCONF,
896 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
897 NETCONFA_IFINDEX_ALL,
898 net->ipv6.devconf_all);
899 }
900 rtnl_unlock();
901
902 return 1;
903 }
904
905 #endif
906
907 /* Nobody refers to this ifaddr, destroy it */
908 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
909 {
910 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
911
912 #ifdef NET_REFCNT_DEBUG
913 pr_debug("%s\n", __func__);
914 #endif
915
916 in6_dev_put(ifp->idev);
917
918 if (cancel_delayed_work(&ifp->dad_work))
919 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
920 ifp);
921
922 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
923 pr_warn("Freeing alive inet6 address %p\n", ifp);
924 return;
925 }
926 ip6_rt_put(ifp->rt);
927
928 kfree_rcu(ifp, rcu);
929 }
930
931 static void
932 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
933 {
934 struct list_head *p;
935 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
936
937 /*
938 * Each device address list is sorted in order of scope -
939 * global before linklocal.
940 */
941 list_for_each(p, &idev->addr_list) {
942 struct inet6_ifaddr *ifa
943 = list_entry(p, struct inet6_ifaddr, if_list);
944 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
945 break;
946 }
947
948 list_add_tail(&ifp->if_list, p);
949 }
950
951 static u32 inet6_addr_hash(const struct in6_addr *addr)
952 {
953 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
954 }
955
956 /* On success it returns ifp with increased reference count */
957
958 static struct inet6_ifaddr *
959 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
960 const struct in6_addr *peer_addr, int pfxlen,
961 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
962 {
963 struct net *net = dev_net(idev->dev);
964 struct inet6_ifaddr *ifa = NULL;
965 struct rt6_info *rt;
966 unsigned int hash;
967 int err = 0;
968 int addr_type = ipv6_addr_type(addr);
969
970 if (addr_type == IPV6_ADDR_ANY ||
971 addr_type & IPV6_ADDR_MULTICAST ||
972 (!(idev->dev->flags & IFF_LOOPBACK) &&
973 addr_type & IPV6_ADDR_LOOPBACK))
974 return ERR_PTR(-EADDRNOTAVAIL);
975
976 rcu_read_lock_bh();
977 if (idev->dead) {
978 err = -ENODEV; /*XXX*/
979 goto out2;
980 }
981
982 if (idev->cnf.disable_ipv6) {
983 err = -EACCES;
984 goto out2;
985 }
986
987 spin_lock(&addrconf_hash_lock);
988
989 /* Ignore adding duplicate addresses on an interface */
990 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
991 ADBG("ipv6_add_addr: already assigned\n");
992 err = -EEXIST;
993 goto out;
994 }
995
996 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
997
998 if (!ifa) {
999 ADBG("ipv6_add_addr: malloc failed\n");
1000 err = -ENOBUFS;
1001 goto out;
1002 }
1003
1004 rt = addrconf_dst_alloc(idev, addr, false);
1005 if (IS_ERR(rt)) {
1006 err = PTR_ERR(rt);
1007 goto out;
1008 }
1009
1010 if (net->ipv6.devconf_all->disable_policy ||
1011 idev->cnf.disable_policy)
1012 rt->dst.flags |= DST_NOPOLICY;
1013
1014 neigh_parms_data_state_setall(idev->nd_parms);
1015
1016 ifa->addr = *addr;
1017 if (peer_addr)
1018 ifa->peer_addr = *peer_addr;
1019
1020 spin_lock_init(&ifa->lock);
1021 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1022 INIT_HLIST_NODE(&ifa->addr_lst);
1023 ifa->scope = scope;
1024 ifa->prefix_len = pfxlen;
1025 ifa->flags = flags | IFA_F_TENTATIVE;
1026 ifa->valid_lft = valid_lft;
1027 ifa->prefered_lft = prefered_lft;
1028 ifa->cstamp = ifa->tstamp = jiffies;
1029 ifa->tokenized = false;
1030
1031 ifa->rt = rt;
1032
1033 ifa->idev = idev;
1034 in6_dev_hold(idev);
1035 /* For caller */
1036 in6_ifa_hold(ifa);
1037
1038 /* Add to big hash table */
1039 hash = inet6_addr_hash(addr);
1040
1041 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1042 spin_unlock(&addrconf_hash_lock);
1043
1044 write_lock(&idev->lock);
1045 /* Add to inet6_dev unicast addr list. */
1046 ipv6_link_dev_addr(idev, ifa);
1047
1048 if (ifa->flags&IFA_F_TEMPORARY) {
1049 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1050 in6_ifa_hold(ifa);
1051 }
1052
1053 in6_ifa_hold(ifa);
1054 write_unlock(&idev->lock);
1055 out2:
1056 rcu_read_unlock_bh();
1057
1058 if (likely(err == 0))
1059 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1060 else {
1061 kfree(ifa);
1062 ifa = ERR_PTR(err);
1063 }
1064
1065 return ifa;
1066 out:
1067 spin_unlock(&addrconf_hash_lock);
1068 goto out2;
1069 }
1070
1071 enum cleanup_prefix_rt_t {
1072 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1073 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1074 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1075 };
1076
1077 /*
1078 * Check, whether the prefix for ifp would still need a prefix route
1079 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1080 * constants.
1081 *
1082 * 1) we don't purge prefix if address was not permanent.
1083 * prefix is managed by its own lifetime.
1084 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1085 * 3) if there are no addresses, delete prefix.
1086 * 4) if there are still other permanent address(es),
1087 * corresponding prefix is still permanent.
1088 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1089 * don't purge the prefix, assume user space is managing it.
1090 * 6) otherwise, update prefix lifetime to the
1091 * longest valid lifetime among the corresponding
1092 * addresses on the device.
1093 * Note: subsequent RA will update lifetime.
1094 **/
1095 static enum cleanup_prefix_rt_t
1096 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1097 {
1098 struct inet6_ifaddr *ifa;
1099 struct inet6_dev *idev = ifp->idev;
1100 unsigned long lifetime;
1101 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1102
1103 *expires = jiffies;
1104
1105 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1106 if (ifa == ifp)
1107 continue;
1108 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1109 ifp->prefix_len))
1110 continue;
1111 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1112 return CLEANUP_PREFIX_RT_NOP;
1113
1114 action = CLEANUP_PREFIX_RT_EXPIRE;
1115
1116 spin_lock(&ifa->lock);
1117
1118 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1119 /*
1120 * Note: Because this address is
1121 * not permanent, lifetime <
1122 * LONG_MAX / HZ here.
1123 */
1124 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1125 *expires = ifa->tstamp + lifetime * HZ;
1126 spin_unlock(&ifa->lock);
1127 }
1128
1129 return action;
1130 }
1131
1132 static void
1133 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1134 {
1135 struct rt6_info *rt;
1136
1137 rt = addrconf_get_prefix_route(&ifp->addr,
1138 ifp->prefix_len,
1139 ifp->idev->dev,
1140 0, RTF_GATEWAY | RTF_DEFAULT);
1141 if (rt) {
1142 if (del_rt)
1143 ip6_del_rt(rt);
1144 else {
1145 if (!(rt->rt6i_flags & RTF_EXPIRES))
1146 rt6_set_expires(rt, expires);
1147 ip6_rt_put(rt);
1148 }
1149 }
1150 }
1151
1152
1153 /* This function wants to get referenced ifp and releases it before return */
1154
1155 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1156 {
1157 int state;
1158 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1159 unsigned long expires;
1160
1161 ASSERT_RTNL();
1162
1163 spin_lock_bh(&ifp->lock);
1164 state = ifp->state;
1165 ifp->state = INET6_IFADDR_STATE_DEAD;
1166 spin_unlock_bh(&ifp->lock);
1167
1168 if (state == INET6_IFADDR_STATE_DEAD)
1169 goto out;
1170
1171 spin_lock_bh(&addrconf_hash_lock);
1172 hlist_del_init_rcu(&ifp->addr_lst);
1173 spin_unlock_bh(&addrconf_hash_lock);
1174
1175 write_lock_bh(&ifp->idev->lock);
1176
1177 if (ifp->flags&IFA_F_TEMPORARY) {
1178 list_del(&ifp->tmp_list);
1179 if (ifp->ifpub) {
1180 in6_ifa_put(ifp->ifpub);
1181 ifp->ifpub = NULL;
1182 }
1183 __in6_ifa_put(ifp);
1184 }
1185
1186 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1187 action = check_cleanup_prefix_route(ifp, &expires);
1188
1189 list_del_init(&ifp->if_list);
1190 __in6_ifa_put(ifp);
1191
1192 write_unlock_bh(&ifp->idev->lock);
1193
1194 addrconf_del_dad_work(ifp);
1195
1196 ipv6_ifa_notify(RTM_DELADDR, ifp);
1197
1198 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1199
1200 if (action != CLEANUP_PREFIX_RT_NOP) {
1201 cleanup_prefix_route(ifp, expires,
1202 action == CLEANUP_PREFIX_RT_DEL);
1203 }
1204
1205 /* clean up prefsrc entries */
1206 rt6_remove_prefsrc(ifp);
1207 out:
1208 in6_ifa_put(ifp);
1209 }
1210
1211 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1212 {
1213 struct inet6_dev *idev = ifp->idev;
1214 struct in6_addr addr, *tmpaddr;
1215 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1216 unsigned long regen_advance;
1217 int tmp_plen;
1218 int ret = 0;
1219 u32 addr_flags;
1220 unsigned long now = jiffies;
1221 long max_desync_factor;
1222 s32 cnf_temp_preferred_lft;
1223
1224 write_lock_bh(&idev->lock);
1225 if (ift) {
1226 spin_lock_bh(&ift->lock);
1227 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1228 spin_unlock_bh(&ift->lock);
1229 tmpaddr = &addr;
1230 } else {
1231 tmpaddr = NULL;
1232 }
1233 retry:
1234 in6_dev_hold(idev);
1235 if (idev->cnf.use_tempaddr <= 0) {
1236 write_unlock_bh(&idev->lock);
1237 pr_info("%s: use_tempaddr is disabled\n", __func__);
1238 in6_dev_put(idev);
1239 ret = -1;
1240 goto out;
1241 }
1242 spin_lock_bh(&ifp->lock);
1243 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1244 idev->cnf.use_tempaddr = -1; /*XXX*/
1245 spin_unlock_bh(&ifp->lock);
1246 write_unlock_bh(&idev->lock);
1247 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1248 __func__);
1249 in6_dev_put(idev);
1250 ret = -1;
1251 goto out;
1252 }
1253 in6_ifa_hold(ifp);
1254 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1255 ipv6_try_regen_rndid(idev, tmpaddr);
1256 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1257 age = (now - ifp->tstamp) / HZ;
1258
1259 regen_advance = idev->cnf.regen_max_retry *
1260 idev->cnf.dad_transmits *
1261 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1262
1263 /* recalculate max_desync_factor each time and update
1264 * idev->desync_factor if it's larger
1265 */
1266 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1267 max_desync_factor = min_t(__u32,
1268 idev->cnf.max_desync_factor,
1269 cnf_temp_preferred_lft - regen_advance);
1270
1271 if (unlikely(idev->desync_factor > max_desync_factor)) {
1272 if (max_desync_factor > 0) {
1273 get_random_bytes(&idev->desync_factor,
1274 sizeof(idev->desync_factor));
1275 idev->desync_factor %= max_desync_factor;
1276 } else {
1277 idev->desync_factor = 0;
1278 }
1279 }
1280
1281 tmp_valid_lft = min_t(__u32,
1282 ifp->valid_lft,
1283 idev->cnf.temp_valid_lft + age);
1284 tmp_prefered_lft = cnf_temp_preferred_lft + age -
1285 idev->desync_factor;
1286 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1287 tmp_plen = ifp->prefix_len;
1288 tmp_tstamp = ifp->tstamp;
1289 spin_unlock_bh(&ifp->lock);
1290
1291 write_unlock_bh(&idev->lock);
1292
1293 /* A temporary address is created only if this calculated Preferred
1294 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1295 * an implementation must not create a temporary address with a zero
1296 * Preferred Lifetime.
1297 * Use age calculation as in addrconf_verify to avoid unnecessary
1298 * temporary addresses being generated.
1299 */
1300 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1301 if (tmp_prefered_lft <= regen_advance + age) {
1302 in6_ifa_put(ifp);
1303 in6_dev_put(idev);
1304 ret = -1;
1305 goto out;
1306 }
1307
1308 addr_flags = IFA_F_TEMPORARY;
1309 /* set in addrconf_prefix_rcv() */
1310 if (ifp->flags & IFA_F_OPTIMISTIC)
1311 addr_flags |= IFA_F_OPTIMISTIC;
1312
1313 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1314 ipv6_addr_scope(&addr), addr_flags,
1315 tmp_valid_lft, tmp_prefered_lft);
1316 if (IS_ERR(ift)) {
1317 in6_ifa_put(ifp);
1318 in6_dev_put(idev);
1319 pr_info("%s: retry temporary address regeneration\n", __func__);
1320 tmpaddr = &addr;
1321 write_lock_bh(&idev->lock);
1322 goto retry;
1323 }
1324
1325 spin_lock_bh(&ift->lock);
1326 ift->ifpub = ifp;
1327 ift->cstamp = now;
1328 ift->tstamp = tmp_tstamp;
1329 spin_unlock_bh(&ift->lock);
1330
1331 addrconf_dad_start(ift);
1332 in6_ifa_put(ift);
1333 in6_dev_put(idev);
1334 out:
1335 return ret;
1336 }
1337
1338 /*
1339 * Choose an appropriate source address (RFC3484)
1340 */
1341 enum {
1342 IPV6_SADDR_RULE_INIT = 0,
1343 IPV6_SADDR_RULE_LOCAL,
1344 IPV6_SADDR_RULE_SCOPE,
1345 IPV6_SADDR_RULE_PREFERRED,
1346 #ifdef CONFIG_IPV6_MIP6
1347 IPV6_SADDR_RULE_HOA,
1348 #endif
1349 IPV6_SADDR_RULE_OIF,
1350 IPV6_SADDR_RULE_LABEL,
1351 IPV6_SADDR_RULE_PRIVACY,
1352 IPV6_SADDR_RULE_ORCHID,
1353 IPV6_SADDR_RULE_PREFIX,
1354 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1355 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1356 #endif
1357 IPV6_SADDR_RULE_MAX
1358 };
1359
1360 struct ipv6_saddr_score {
1361 int rule;
1362 int addr_type;
1363 struct inet6_ifaddr *ifa;
1364 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1365 int scopedist;
1366 int matchlen;
1367 };
1368
1369 struct ipv6_saddr_dst {
1370 const struct in6_addr *addr;
1371 int ifindex;
1372 int scope;
1373 int label;
1374 unsigned int prefs;
1375 };
1376
1377 static inline int ipv6_saddr_preferred(int type)
1378 {
1379 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1380 return 1;
1381 return 0;
1382 }
1383
1384 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1385 {
1386 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1387 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1388 #else
1389 return false;
1390 #endif
1391 }
1392
1393 static int ipv6_get_saddr_eval(struct net *net,
1394 struct ipv6_saddr_score *score,
1395 struct ipv6_saddr_dst *dst,
1396 int i)
1397 {
1398 int ret;
1399
1400 if (i <= score->rule) {
1401 switch (i) {
1402 case IPV6_SADDR_RULE_SCOPE:
1403 ret = score->scopedist;
1404 break;
1405 case IPV6_SADDR_RULE_PREFIX:
1406 ret = score->matchlen;
1407 break;
1408 default:
1409 ret = !!test_bit(i, score->scorebits);
1410 }
1411 goto out;
1412 }
1413
1414 switch (i) {
1415 case IPV6_SADDR_RULE_INIT:
1416 /* Rule 0: remember if hiscore is not ready yet */
1417 ret = !!score->ifa;
1418 break;
1419 case IPV6_SADDR_RULE_LOCAL:
1420 /* Rule 1: Prefer same address */
1421 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1422 break;
1423 case IPV6_SADDR_RULE_SCOPE:
1424 /* Rule 2: Prefer appropriate scope
1425 *
1426 * ret
1427 * ^
1428 * -1 | d 15
1429 * ---+--+-+---> scope
1430 * |
1431 * | d is scope of the destination.
1432 * B-d | \
1433 * | \ <- smaller scope is better if
1434 * B-15 | \ if scope is enough for destination.
1435 * | ret = B - scope (-1 <= scope >= d <= 15).
1436 * d-C-1 | /
1437 * |/ <- greater is better
1438 * -C / if scope is not enough for destination.
1439 * /| ret = scope - C (-1 <= d < scope <= 15).
1440 *
1441 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1442 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1443 * Assume B = 0 and we get C > 29.
1444 */
1445 ret = __ipv6_addr_src_scope(score->addr_type);
1446 if (ret >= dst->scope)
1447 ret = -ret;
1448 else
1449 ret -= 128; /* 30 is enough */
1450 score->scopedist = ret;
1451 break;
1452 case IPV6_SADDR_RULE_PREFERRED:
1453 {
1454 /* Rule 3: Avoid deprecated and optimistic addresses */
1455 u8 avoid = IFA_F_DEPRECATED;
1456
1457 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1458 avoid |= IFA_F_OPTIMISTIC;
1459 ret = ipv6_saddr_preferred(score->addr_type) ||
1460 !(score->ifa->flags & avoid);
1461 break;
1462 }
1463 #ifdef CONFIG_IPV6_MIP6
1464 case IPV6_SADDR_RULE_HOA:
1465 {
1466 /* Rule 4: Prefer home address */
1467 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1468 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1469 break;
1470 }
1471 #endif
1472 case IPV6_SADDR_RULE_OIF:
1473 /* Rule 5: Prefer outgoing interface */
1474 ret = (!dst->ifindex ||
1475 dst->ifindex == score->ifa->idev->dev->ifindex);
1476 break;
1477 case IPV6_SADDR_RULE_LABEL:
1478 /* Rule 6: Prefer matching label */
1479 ret = ipv6_addr_label(net,
1480 &score->ifa->addr, score->addr_type,
1481 score->ifa->idev->dev->ifindex) == dst->label;
1482 break;
1483 case IPV6_SADDR_RULE_PRIVACY:
1484 {
1485 /* Rule 7: Prefer public address
1486 * Note: prefer temporary address if use_tempaddr >= 2
1487 */
1488 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1489 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1490 score->ifa->idev->cnf.use_tempaddr >= 2;
1491 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1492 break;
1493 }
1494 case IPV6_SADDR_RULE_ORCHID:
1495 /* Rule 8-: Prefer ORCHID vs ORCHID or
1496 * non-ORCHID vs non-ORCHID
1497 */
1498 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1499 ipv6_addr_orchid(dst->addr));
1500 break;
1501 case IPV6_SADDR_RULE_PREFIX:
1502 /* Rule 8: Use longest matching prefix */
1503 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1504 if (ret > score->ifa->prefix_len)
1505 ret = score->ifa->prefix_len;
1506 score->matchlen = ret;
1507 break;
1508 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1509 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1510 /* Optimistic addresses still have lower precedence than other
1511 * preferred addresses.
1512 */
1513 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1514 break;
1515 #endif
1516 default:
1517 ret = 0;
1518 }
1519
1520 if (ret)
1521 __set_bit(i, score->scorebits);
1522 score->rule = i;
1523 out:
1524 return ret;
1525 }
1526
1527 static int __ipv6_dev_get_saddr(struct net *net,
1528 struct ipv6_saddr_dst *dst,
1529 struct inet6_dev *idev,
1530 struct ipv6_saddr_score *scores,
1531 int hiscore_idx)
1532 {
1533 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1534
1535 read_lock_bh(&idev->lock);
1536 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1537 int i;
1538
1539 /*
1540 * - Tentative Address (RFC2462 section 5.4)
1541 * - A tentative address is not considered
1542 * "assigned to an interface" in the traditional
1543 * sense, unless it is also flagged as optimistic.
1544 * - Candidate Source Address (section 4)
1545 * - In any case, anycast addresses, multicast
1546 * addresses, and the unspecified address MUST
1547 * NOT be included in a candidate set.
1548 */
1549 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1550 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1551 continue;
1552
1553 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1554
1555 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1556 score->addr_type & IPV6_ADDR_MULTICAST)) {
1557 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1558 idev->dev->name);
1559 continue;
1560 }
1561
1562 score->rule = -1;
1563 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1564
1565 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1566 int minihiscore, miniscore;
1567
1568 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1569 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1570
1571 if (minihiscore > miniscore) {
1572 if (i == IPV6_SADDR_RULE_SCOPE &&
1573 score->scopedist > 0) {
1574 /*
1575 * special case:
1576 * each remaining entry
1577 * has too small (not enough)
1578 * scope, because ifa entries
1579 * are sorted by their scope
1580 * values.
1581 */
1582 goto out;
1583 }
1584 break;
1585 } else if (minihiscore < miniscore) {
1586 if (hiscore->ifa)
1587 in6_ifa_put(hiscore->ifa);
1588
1589 in6_ifa_hold(score->ifa);
1590
1591 swap(hiscore, score);
1592 hiscore_idx = 1 - hiscore_idx;
1593
1594 /* restore our iterator */
1595 score->ifa = hiscore->ifa;
1596
1597 break;
1598 }
1599 }
1600 }
1601 out:
1602 read_unlock_bh(&idev->lock);
1603 return hiscore_idx;
1604 }
1605
1606 static int ipv6_get_saddr_master(struct net *net,
1607 const struct net_device *dst_dev,
1608 const struct net_device *master,
1609 struct ipv6_saddr_dst *dst,
1610 struct ipv6_saddr_score *scores,
1611 int hiscore_idx)
1612 {
1613 struct inet6_dev *idev;
1614
1615 idev = __in6_dev_get(dst_dev);
1616 if (idev)
1617 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1618 scores, hiscore_idx);
1619
1620 idev = __in6_dev_get(master);
1621 if (idev)
1622 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1623 scores, hiscore_idx);
1624
1625 return hiscore_idx;
1626 }
1627
1628 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1629 const struct in6_addr *daddr, unsigned int prefs,
1630 struct in6_addr *saddr)
1631 {
1632 struct ipv6_saddr_score scores[2], *hiscore;
1633 struct ipv6_saddr_dst dst;
1634 struct inet6_dev *idev;
1635 struct net_device *dev;
1636 int dst_type;
1637 bool use_oif_addr = false;
1638 int hiscore_idx = 0;
1639
1640 dst_type = __ipv6_addr_type(daddr);
1641 dst.addr = daddr;
1642 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1643 dst.scope = __ipv6_addr_src_scope(dst_type);
1644 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1645 dst.prefs = prefs;
1646
1647 scores[hiscore_idx].rule = -1;
1648 scores[hiscore_idx].ifa = NULL;
1649
1650 rcu_read_lock();
1651
1652 /* Candidate Source Address (section 4)
1653 * - multicast and link-local destination address,
1654 * the set of candidate source address MUST only
1655 * include addresses assigned to interfaces
1656 * belonging to the same link as the outgoing
1657 * interface.
1658 * (- For site-local destination addresses, the
1659 * set of candidate source addresses MUST only
1660 * include addresses assigned to interfaces
1661 * belonging to the same site as the outgoing
1662 * interface.)
1663 * - "It is RECOMMENDED that the candidate source addresses
1664 * be the set of unicast addresses assigned to the
1665 * interface that will be used to send to the destination
1666 * (the 'outgoing' interface)." (RFC 6724)
1667 */
1668 if (dst_dev) {
1669 idev = __in6_dev_get(dst_dev);
1670 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1671 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1672 (idev && idev->cnf.use_oif_addrs_only)) {
1673 use_oif_addr = true;
1674 }
1675 }
1676
1677 if (use_oif_addr) {
1678 if (idev)
1679 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1680 } else {
1681 const struct net_device *master;
1682 int master_idx = 0;
1683
1684 /* if dst_dev exists and is enslaved to an L3 device, then
1685 * prefer addresses from dst_dev and then the master over
1686 * any other enslaved devices in the L3 domain.
1687 */
1688 master = l3mdev_master_dev_rcu(dst_dev);
1689 if (master) {
1690 master_idx = master->ifindex;
1691
1692 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1693 master, &dst,
1694 scores, hiscore_idx);
1695
1696 if (scores[hiscore_idx].ifa)
1697 goto out;
1698 }
1699
1700 for_each_netdev_rcu(net, dev) {
1701 /* only consider addresses on devices in the
1702 * same L3 domain
1703 */
1704 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1705 continue;
1706 idev = __in6_dev_get(dev);
1707 if (!idev)
1708 continue;
1709 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1710 }
1711 }
1712
1713 out:
1714 rcu_read_unlock();
1715
1716 hiscore = &scores[hiscore_idx];
1717 if (!hiscore->ifa)
1718 return -EADDRNOTAVAIL;
1719
1720 *saddr = hiscore->ifa->addr;
1721 in6_ifa_put(hiscore->ifa);
1722 return 0;
1723 }
1724 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1725
1726 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1727 u32 banned_flags)
1728 {
1729 struct inet6_ifaddr *ifp;
1730 int err = -EADDRNOTAVAIL;
1731
1732 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1733 if (ifp->scope > IFA_LINK)
1734 break;
1735 if (ifp->scope == IFA_LINK &&
1736 !(ifp->flags & banned_flags)) {
1737 *addr = ifp->addr;
1738 err = 0;
1739 break;
1740 }
1741 }
1742 return err;
1743 }
1744
1745 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1746 u32 banned_flags)
1747 {
1748 struct inet6_dev *idev;
1749 int err = -EADDRNOTAVAIL;
1750
1751 rcu_read_lock();
1752 idev = __in6_dev_get(dev);
1753 if (idev) {
1754 read_lock_bh(&idev->lock);
1755 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1756 read_unlock_bh(&idev->lock);
1757 }
1758 rcu_read_unlock();
1759 return err;
1760 }
1761
1762 static int ipv6_count_addresses(struct inet6_dev *idev)
1763 {
1764 int cnt = 0;
1765 struct inet6_ifaddr *ifp;
1766
1767 read_lock_bh(&idev->lock);
1768 list_for_each_entry(ifp, &idev->addr_list, if_list)
1769 cnt++;
1770 read_unlock_bh(&idev->lock);
1771 return cnt;
1772 }
1773
1774 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1775 const struct net_device *dev, int strict)
1776 {
1777 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1778 }
1779 EXPORT_SYMBOL(ipv6_chk_addr);
1780
1781 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1782 const struct net_device *dev, int strict,
1783 u32 banned_flags)
1784 {
1785 struct inet6_ifaddr *ifp;
1786 unsigned int hash = inet6_addr_hash(addr);
1787 u32 ifp_flags;
1788
1789 rcu_read_lock_bh();
1790 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1791 if (!net_eq(dev_net(ifp->idev->dev), net))
1792 continue;
1793 /* Decouple optimistic from tentative for evaluation here.
1794 * Ban optimistic addresses explicitly, when required.
1795 */
1796 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1797 ? (ifp->flags&~IFA_F_TENTATIVE)
1798 : ifp->flags;
1799 if (ipv6_addr_equal(&ifp->addr, addr) &&
1800 !(ifp_flags&banned_flags) &&
1801 (!dev || ifp->idev->dev == dev ||
1802 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1803 rcu_read_unlock_bh();
1804 return 1;
1805 }
1806 }
1807
1808 rcu_read_unlock_bh();
1809 return 0;
1810 }
1811 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1812
1813 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1814 struct net_device *dev)
1815 {
1816 unsigned int hash = inet6_addr_hash(addr);
1817 struct inet6_ifaddr *ifp;
1818
1819 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1820 if (!net_eq(dev_net(ifp->idev->dev), net))
1821 continue;
1822 if (ipv6_addr_equal(&ifp->addr, addr)) {
1823 if (!dev || ifp->idev->dev == dev)
1824 return true;
1825 }
1826 }
1827 return false;
1828 }
1829
1830 /* Compares an address/prefix_len with addresses on device @dev.
1831 * If one is found it returns true.
1832 */
1833 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1834 const unsigned int prefix_len, struct net_device *dev)
1835 {
1836 struct inet6_dev *idev;
1837 struct inet6_ifaddr *ifa;
1838 bool ret = false;
1839
1840 rcu_read_lock();
1841 idev = __in6_dev_get(dev);
1842 if (idev) {
1843 read_lock_bh(&idev->lock);
1844 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1845 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1846 if (ret)
1847 break;
1848 }
1849 read_unlock_bh(&idev->lock);
1850 }
1851 rcu_read_unlock();
1852
1853 return ret;
1854 }
1855 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1856
1857 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1858 {
1859 struct inet6_dev *idev;
1860 struct inet6_ifaddr *ifa;
1861 int onlink;
1862
1863 onlink = 0;
1864 rcu_read_lock();
1865 idev = __in6_dev_get(dev);
1866 if (idev) {
1867 read_lock_bh(&idev->lock);
1868 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1869 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1870 ifa->prefix_len);
1871 if (onlink)
1872 break;
1873 }
1874 read_unlock_bh(&idev->lock);
1875 }
1876 rcu_read_unlock();
1877 return onlink;
1878 }
1879 EXPORT_SYMBOL(ipv6_chk_prefix);
1880
1881 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1882 struct net_device *dev, int strict)
1883 {
1884 struct inet6_ifaddr *ifp, *result = NULL;
1885 unsigned int hash = inet6_addr_hash(addr);
1886
1887 rcu_read_lock_bh();
1888 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1889 if (!net_eq(dev_net(ifp->idev->dev), net))
1890 continue;
1891 if (ipv6_addr_equal(&ifp->addr, addr)) {
1892 if (!dev || ifp->idev->dev == dev ||
1893 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1894 result = ifp;
1895 in6_ifa_hold(ifp);
1896 break;
1897 }
1898 }
1899 }
1900 rcu_read_unlock_bh();
1901
1902 return result;
1903 }
1904
1905 /* Gets referenced address, destroys ifaddr */
1906
1907 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1908 {
1909 if (dad_failed)
1910 ifp->flags |= IFA_F_DADFAILED;
1911
1912 if (ifp->flags&IFA_F_PERMANENT) {
1913 spin_lock_bh(&ifp->lock);
1914 addrconf_del_dad_work(ifp);
1915 ifp->flags |= IFA_F_TENTATIVE;
1916 spin_unlock_bh(&ifp->lock);
1917 if (dad_failed)
1918 ipv6_ifa_notify(0, ifp);
1919 in6_ifa_put(ifp);
1920 } else if (ifp->flags&IFA_F_TEMPORARY) {
1921 struct inet6_ifaddr *ifpub;
1922 spin_lock_bh(&ifp->lock);
1923 ifpub = ifp->ifpub;
1924 if (ifpub) {
1925 in6_ifa_hold(ifpub);
1926 spin_unlock_bh(&ifp->lock);
1927 ipv6_create_tempaddr(ifpub, ifp);
1928 in6_ifa_put(ifpub);
1929 } else {
1930 spin_unlock_bh(&ifp->lock);
1931 }
1932 ipv6_del_addr(ifp);
1933 } else {
1934 ipv6_del_addr(ifp);
1935 }
1936 }
1937
1938 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1939 {
1940 int err = -ENOENT;
1941
1942 spin_lock_bh(&ifp->lock);
1943 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1944 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1945 err = 0;
1946 }
1947 spin_unlock_bh(&ifp->lock);
1948
1949 return err;
1950 }
1951
1952 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1953 {
1954 struct inet6_dev *idev = ifp->idev;
1955 struct net *net = dev_net(ifp->idev->dev);
1956
1957 if (addrconf_dad_end(ifp)) {
1958 in6_ifa_put(ifp);
1959 return;
1960 }
1961
1962 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1963 ifp->idev->dev->name, &ifp->addr);
1964
1965 spin_lock_bh(&ifp->lock);
1966
1967 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1968 int scope = ifp->scope;
1969 u32 flags = ifp->flags;
1970 struct in6_addr new_addr;
1971 struct inet6_ifaddr *ifp2;
1972 u32 valid_lft, preferred_lft;
1973 int pfxlen = ifp->prefix_len;
1974 int retries = ifp->stable_privacy_retry + 1;
1975
1976 if (retries > net->ipv6.sysctl.idgen_retries) {
1977 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1978 ifp->idev->dev->name);
1979 goto errdad;
1980 }
1981
1982 new_addr = ifp->addr;
1983 if (ipv6_generate_stable_address(&new_addr, retries,
1984 idev))
1985 goto errdad;
1986
1987 valid_lft = ifp->valid_lft;
1988 preferred_lft = ifp->prefered_lft;
1989
1990 spin_unlock_bh(&ifp->lock);
1991
1992 if (idev->cnf.max_addresses &&
1993 ipv6_count_addresses(idev) >=
1994 idev->cnf.max_addresses)
1995 goto lock_errdad;
1996
1997 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1998 ifp->idev->dev->name);
1999
2000 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
2001 scope, flags, valid_lft,
2002 preferred_lft);
2003 if (IS_ERR(ifp2))
2004 goto lock_errdad;
2005
2006 spin_lock_bh(&ifp2->lock);
2007 ifp2->stable_privacy_retry = retries;
2008 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2009 spin_unlock_bh(&ifp2->lock);
2010
2011 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2012 in6_ifa_put(ifp2);
2013 lock_errdad:
2014 spin_lock_bh(&ifp->lock);
2015 }
2016
2017 errdad:
2018 /* transition from _POSTDAD to _ERRDAD */
2019 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2020 spin_unlock_bh(&ifp->lock);
2021
2022 addrconf_mod_dad_work(ifp, 0);
2023 in6_ifa_put(ifp);
2024 }
2025
2026 /* Join to solicited addr multicast group.
2027 * caller must hold RTNL */
2028 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2029 {
2030 struct in6_addr maddr;
2031
2032 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2033 return;
2034
2035 addrconf_addr_solict_mult(addr, &maddr);
2036 ipv6_dev_mc_inc(dev, &maddr);
2037 }
2038
2039 /* caller must hold RTNL */
2040 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2041 {
2042 struct in6_addr maddr;
2043
2044 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2045 return;
2046
2047 addrconf_addr_solict_mult(addr, &maddr);
2048 __ipv6_dev_mc_dec(idev, &maddr);
2049 }
2050
2051 /* caller must hold RTNL */
2052 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2053 {
2054 struct in6_addr addr;
2055
2056 if (ifp->prefix_len >= 127) /* RFC 6164 */
2057 return;
2058 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2059 if (ipv6_addr_any(&addr))
2060 return;
2061 __ipv6_dev_ac_inc(ifp->idev, &addr);
2062 }
2063
2064 /* caller must hold RTNL */
2065 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2066 {
2067 struct in6_addr addr;
2068
2069 if (ifp->prefix_len >= 127) /* RFC 6164 */
2070 return;
2071 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2072 if (ipv6_addr_any(&addr))
2073 return;
2074 __ipv6_dev_ac_dec(ifp->idev, &addr);
2075 }
2076
2077 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2078 {
2079 switch (dev->addr_len) {
2080 case ETH_ALEN:
2081 memcpy(eui, dev->dev_addr, 3);
2082 eui[3] = 0xFF;
2083 eui[4] = 0xFE;
2084 memcpy(eui + 5, dev->dev_addr + 3, 3);
2085 break;
2086 case EUI64_ADDR_LEN:
2087 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2088 eui[0] ^= 2;
2089 break;
2090 default:
2091 return -1;
2092 }
2093
2094 return 0;
2095 }
2096
2097 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2098 {
2099 union fwnet_hwaddr *ha;
2100
2101 if (dev->addr_len != FWNET_ALEN)
2102 return -1;
2103
2104 ha = (union fwnet_hwaddr *)dev->dev_addr;
2105
2106 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2107 eui[0] ^= 2;
2108 return 0;
2109 }
2110
2111 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2112 {
2113 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2114 if (dev->addr_len != ARCNET_ALEN)
2115 return -1;
2116 memset(eui, 0, 7);
2117 eui[7] = *(u8 *)dev->dev_addr;
2118 return 0;
2119 }
2120
2121 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2122 {
2123 if (dev->addr_len != INFINIBAND_ALEN)
2124 return -1;
2125 memcpy(eui, dev->dev_addr + 12, 8);
2126 eui[0] |= 2;
2127 return 0;
2128 }
2129
2130 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2131 {
2132 if (addr == 0)
2133 return -1;
2134 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2135 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2136 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2137 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2138 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2139 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2140 eui[1] = 0;
2141 eui[2] = 0x5E;
2142 eui[3] = 0xFE;
2143 memcpy(eui + 4, &addr, 4);
2144 return 0;
2145 }
2146
2147 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2148 {
2149 if (dev->priv_flags & IFF_ISATAP)
2150 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2151 return -1;
2152 }
2153
2154 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2155 {
2156 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2157 }
2158
2159 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2160 {
2161 memcpy(eui, dev->perm_addr, 3);
2162 memcpy(eui + 5, dev->perm_addr + 3, 3);
2163 eui[3] = 0xFF;
2164 eui[4] = 0xFE;
2165 eui[0] ^= 2;
2166 return 0;
2167 }
2168
2169 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2170 {
2171 switch (dev->type) {
2172 case ARPHRD_ETHER:
2173 case ARPHRD_FDDI:
2174 return addrconf_ifid_eui48(eui, dev);
2175 case ARPHRD_ARCNET:
2176 return addrconf_ifid_arcnet(eui, dev);
2177 case ARPHRD_INFINIBAND:
2178 return addrconf_ifid_infiniband(eui, dev);
2179 case ARPHRD_SIT:
2180 return addrconf_ifid_sit(eui, dev);
2181 case ARPHRD_IPGRE:
2182 case ARPHRD_TUNNEL:
2183 return addrconf_ifid_gre(eui, dev);
2184 case ARPHRD_6LOWPAN:
2185 return addrconf_ifid_6lowpan(eui, dev);
2186 case ARPHRD_IEEE1394:
2187 return addrconf_ifid_ieee1394(eui, dev);
2188 case ARPHRD_TUNNEL6:
2189 case ARPHRD_IP6GRE:
2190 return addrconf_ifid_ip6tnl(eui, dev);
2191 }
2192 return -1;
2193 }
2194
2195 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2196 {
2197 int err = -1;
2198 struct inet6_ifaddr *ifp;
2199
2200 read_lock_bh(&idev->lock);
2201 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2202 if (ifp->scope > IFA_LINK)
2203 break;
2204 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2205 memcpy(eui, ifp->addr.s6_addr+8, 8);
2206 err = 0;
2207 break;
2208 }
2209 }
2210 read_unlock_bh(&idev->lock);
2211 return err;
2212 }
2213
2214 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2215 static void ipv6_regen_rndid(struct inet6_dev *idev)
2216 {
2217 regen:
2218 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2219 idev->rndid[0] &= ~0x02;
2220
2221 /*
2222 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2223 * check if generated address is not inappropriate
2224 *
2225 * - Reserved subnet anycast (RFC 2526)
2226 * 11111101 11....11 1xxxxxxx
2227 * - ISATAP (RFC4214) 6.1
2228 * 00-00-5E-FE-xx-xx-xx-xx
2229 * - value 0
2230 * - XXX: already assigned to an address on the device
2231 */
2232 if (idev->rndid[0] == 0xfd &&
2233 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2234 (idev->rndid[7]&0x80))
2235 goto regen;
2236 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2237 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2238 goto regen;
2239 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2240 goto regen;
2241 }
2242 }
2243
2244 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2245 {
2246 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2247 ipv6_regen_rndid(idev);
2248 }
2249
2250 /*
2251 * Add prefix route.
2252 */
2253
2254 static void
2255 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2256 unsigned long expires, u32 flags)
2257 {
2258 struct fib6_config cfg = {
2259 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2260 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2261 .fc_ifindex = dev->ifindex,
2262 .fc_expires = expires,
2263 .fc_dst_len = plen,
2264 .fc_flags = RTF_UP | flags,
2265 .fc_nlinfo.nl_net = dev_net(dev),
2266 .fc_protocol = RTPROT_KERNEL,
2267 };
2268
2269 cfg.fc_dst = *pfx;
2270
2271 /* Prevent useless cloning on PtP SIT.
2272 This thing is done here expecting that the whole
2273 class of non-broadcast devices need not cloning.
2274 */
2275 #if IS_ENABLED(CONFIG_IPV6_SIT)
2276 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2277 cfg.fc_flags |= RTF_NONEXTHOP;
2278 #endif
2279
2280 ip6_route_add(&cfg);
2281 }
2282
2283
2284 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2285 int plen,
2286 const struct net_device *dev,
2287 u32 flags, u32 noflags)
2288 {
2289 struct fib6_node *fn;
2290 struct rt6_info *rt = NULL;
2291 struct fib6_table *table;
2292 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2293
2294 table = fib6_get_table(dev_net(dev), tb_id);
2295 if (!table)
2296 return NULL;
2297
2298 read_lock_bh(&table->tb6_lock);
2299 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2300 if (!fn)
2301 goto out;
2302
2303 noflags |= RTF_CACHE;
2304 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2305 if (rt->dst.dev->ifindex != dev->ifindex)
2306 continue;
2307 if ((rt->rt6i_flags & flags) != flags)
2308 continue;
2309 if ((rt->rt6i_flags & noflags) != 0)
2310 continue;
2311 dst_hold(&rt->dst);
2312 break;
2313 }
2314 out:
2315 read_unlock_bh(&table->tb6_lock);
2316 return rt;
2317 }
2318
2319
2320 /* Create "default" multicast route to the interface */
2321
2322 static void addrconf_add_mroute(struct net_device *dev)
2323 {
2324 struct fib6_config cfg = {
2325 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2326 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2327 .fc_ifindex = dev->ifindex,
2328 .fc_dst_len = 8,
2329 .fc_flags = RTF_UP,
2330 .fc_nlinfo.nl_net = dev_net(dev),
2331 };
2332
2333 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2334
2335 ip6_route_add(&cfg);
2336 }
2337
2338 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2339 {
2340 struct inet6_dev *idev;
2341
2342 ASSERT_RTNL();
2343
2344 idev = ipv6_find_idev(dev);
2345 if (!idev)
2346 return ERR_PTR(-ENOBUFS);
2347
2348 if (idev->cnf.disable_ipv6)
2349 return ERR_PTR(-EACCES);
2350
2351 /* Add default multicast route */
2352 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2353 addrconf_add_mroute(dev);
2354
2355 return idev;
2356 }
2357
2358 static void manage_tempaddrs(struct inet6_dev *idev,
2359 struct inet6_ifaddr *ifp,
2360 __u32 valid_lft, __u32 prefered_lft,
2361 bool create, unsigned long now)
2362 {
2363 u32 flags;
2364 struct inet6_ifaddr *ift;
2365
2366 read_lock_bh(&idev->lock);
2367 /* update all temporary addresses in the list */
2368 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2369 int age, max_valid, max_prefered;
2370
2371 if (ifp != ift->ifpub)
2372 continue;
2373
2374 /* RFC 4941 section 3.3:
2375 * If a received option will extend the lifetime of a public
2376 * address, the lifetimes of temporary addresses should
2377 * be extended, subject to the overall constraint that no
2378 * temporary addresses should ever remain "valid" or "preferred"
2379 * for a time longer than (TEMP_VALID_LIFETIME) or
2380 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2381 */
2382 age = (now - ift->cstamp) / HZ;
2383 max_valid = idev->cnf.temp_valid_lft - age;
2384 if (max_valid < 0)
2385 max_valid = 0;
2386
2387 max_prefered = idev->cnf.temp_prefered_lft -
2388 idev->desync_factor - age;
2389 if (max_prefered < 0)
2390 max_prefered = 0;
2391
2392 if (valid_lft > max_valid)
2393 valid_lft = max_valid;
2394
2395 if (prefered_lft > max_prefered)
2396 prefered_lft = max_prefered;
2397
2398 spin_lock(&ift->lock);
2399 flags = ift->flags;
2400 ift->valid_lft = valid_lft;
2401 ift->prefered_lft = prefered_lft;
2402 ift->tstamp = now;
2403 if (prefered_lft > 0)
2404 ift->flags &= ~IFA_F_DEPRECATED;
2405
2406 spin_unlock(&ift->lock);
2407 if (!(flags&IFA_F_TENTATIVE))
2408 ipv6_ifa_notify(0, ift);
2409 }
2410
2411 if ((create || list_empty(&idev->tempaddr_list)) &&
2412 idev->cnf.use_tempaddr > 0) {
2413 /* When a new public address is created as described
2414 * in [ADDRCONF], also create a new temporary address.
2415 * Also create a temporary address if it's enabled but
2416 * no temporary address currently exists.
2417 */
2418 read_unlock_bh(&idev->lock);
2419 ipv6_create_tempaddr(ifp, NULL);
2420 } else {
2421 read_unlock_bh(&idev->lock);
2422 }
2423 }
2424
2425 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2426 {
2427 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2428 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2429 }
2430
2431 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2432 const struct prefix_info *pinfo,
2433 struct inet6_dev *in6_dev,
2434 const struct in6_addr *addr, int addr_type,
2435 u32 addr_flags, bool sllao, bool tokenized,
2436 __u32 valid_lft, u32 prefered_lft)
2437 {
2438 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2439 int create = 0, update_lft = 0;
2440
2441 if (!ifp && valid_lft) {
2442 int max_addresses = in6_dev->cnf.max_addresses;
2443
2444 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2445 if (in6_dev->cnf.optimistic_dad &&
2446 !net->ipv6.devconf_all->forwarding && sllao)
2447 addr_flags |= IFA_F_OPTIMISTIC;
2448 #endif
2449
2450 /* Do not allow to create too much of autoconfigured
2451 * addresses; this would be too easy way to crash kernel.
2452 */
2453 if (!max_addresses ||
2454 ipv6_count_addresses(in6_dev) < max_addresses)
2455 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2456 pinfo->prefix_len,
2457 addr_type&IPV6_ADDR_SCOPE_MASK,
2458 addr_flags, valid_lft,
2459 prefered_lft);
2460
2461 if (IS_ERR_OR_NULL(ifp))
2462 return -1;
2463
2464 update_lft = 0;
2465 create = 1;
2466 spin_lock_bh(&ifp->lock);
2467 ifp->flags |= IFA_F_MANAGETEMPADDR;
2468 ifp->cstamp = jiffies;
2469 ifp->tokenized = tokenized;
2470 spin_unlock_bh(&ifp->lock);
2471 addrconf_dad_start(ifp);
2472 }
2473
2474 if (ifp) {
2475 u32 flags;
2476 unsigned long now;
2477 u32 stored_lft;
2478
2479 /* update lifetime (RFC2462 5.5.3 e) */
2480 spin_lock_bh(&ifp->lock);
2481 now = jiffies;
2482 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2483 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2484 else
2485 stored_lft = 0;
2486 if (!update_lft && !create && stored_lft) {
2487 const u32 minimum_lft = min_t(u32,
2488 stored_lft, MIN_VALID_LIFETIME);
2489 valid_lft = max(valid_lft, minimum_lft);
2490
2491 /* RFC4862 Section 5.5.3e:
2492 * "Note that the preferred lifetime of the
2493 * corresponding address is always reset to
2494 * the Preferred Lifetime in the received
2495 * Prefix Information option, regardless of
2496 * whether the valid lifetime is also reset or
2497 * ignored."
2498 *
2499 * So we should always update prefered_lft here.
2500 */
2501 update_lft = 1;
2502 }
2503
2504 if (update_lft) {
2505 ifp->valid_lft = valid_lft;
2506 ifp->prefered_lft = prefered_lft;
2507 ifp->tstamp = now;
2508 flags = ifp->flags;
2509 ifp->flags &= ~IFA_F_DEPRECATED;
2510 spin_unlock_bh(&ifp->lock);
2511
2512 if (!(flags&IFA_F_TENTATIVE))
2513 ipv6_ifa_notify(0, ifp);
2514 } else
2515 spin_unlock_bh(&ifp->lock);
2516
2517 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2518 create, now);
2519
2520 in6_ifa_put(ifp);
2521 addrconf_verify();
2522 }
2523
2524 return 0;
2525 }
2526 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2527
2528 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2529 {
2530 struct prefix_info *pinfo;
2531 __u32 valid_lft;
2532 __u32 prefered_lft;
2533 int addr_type, err;
2534 u32 addr_flags = 0;
2535 struct inet6_dev *in6_dev;
2536 struct net *net = dev_net(dev);
2537
2538 pinfo = (struct prefix_info *) opt;
2539
2540 if (len < sizeof(struct prefix_info)) {
2541 ADBG("addrconf: prefix option too short\n");
2542 return;
2543 }
2544
2545 /*
2546 * Validation checks ([ADDRCONF], page 19)
2547 */
2548
2549 addr_type = ipv6_addr_type(&pinfo->prefix);
2550
2551 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2552 return;
2553
2554 valid_lft = ntohl(pinfo->valid);
2555 prefered_lft = ntohl(pinfo->prefered);
2556
2557 if (prefered_lft > valid_lft) {
2558 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2559 return;
2560 }
2561
2562 in6_dev = in6_dev_get(dev);
2563
2564 if (!in6_dev) {
2565 net_dbg_ratelimited("addrconf: device %s not configured\n",
2566 dev->name);
2567 return;
2568 }
2569
2570 /*
2571 * Two things going on here:
2572 * 1) Add routes for on-link prefixes
2573 * 2) Configure prefixes with the auto flag set
2574 */
2575
2576 if (pinfo->onlink) {
2577 struct rt6_info *rt;
2578 unsigned long rt_expires;
2579
2580 /* Avoid arithmetic overflow. Really, we could
2581 * save rt_expires in seconds, likely valid_lft,
2582 * but it would require division in fib gc, that it
2583 * not good.
2584 */
2585 if (HZ > USER_HZ)
2586 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2587 else
2588 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2589
2590 if (addrconf_finite_timeout(rt_expires))
2591 rt_expires *= HZ;
2592
2593 rt = addrconf_get_prefix_route(&pinfo->prefix,
2594 pinfo->prefix_len,
2595 dev,
2596 RTF_ADDRCONF | RTF_PREFIX_RT,
2597 RTF_GATEWAY | RTF_DEFAULT);
2598
2599 if (rt) {
2600 /* Autoconf prefix route */
2601 if (valid_lft == 0) {
2602 ip6_del_rt(rt);
2603 rt = NULL;
2604 } else if (addrconf_finite_timeout(rt_expires)) {
2605 /* not infinity */
2606 rt6_set_expires(rt, jiffies + rt_expires);
2607 } else {
2608 rt6_clean_expires(rt);
2609 }
2610 } else if (valid_lft) {
2611 clock_t expires = 0;
2612 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2613 if (addrconf_finite_timeout(rt_expires)) {
2614 /* not infinity */
2615 flags |= RTF_EXPIRES;
2616 expires = jiffies_to_clock_t(rt_expires);
2617 }
2618 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2619 dev, expires, flags);
2620 }
2621 ip6_rt_put(rt);
2622 }
2623
2624 /* Try to figure out our local address for this prefix */
2625
2626 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2627 struct in6_addr addr;
2628 bool tokenized = false, dev_addr_generated = false;
2629
2630 if (pinfo->prefix_len == 64) {
2631 memcpy(&addr, &pinfo->prefix, 8);
2632
2633 if (!ipv6_addr_any(&in6_dev->token)) {
2634 read_lock_bh(&in6_dev->lock);
2635 memcpy(addr.s6_addr + 8,
2636 in6_dev->token.s6_addr + 8, 8);
2637 read_unlock_bh(&in6_dev->lock);
2638 tokenized = true;
2639 } else if (is_addr_mode_generate_stable(in6_dev) &&
2640 !ipv6_generate_stable_address(&addr, 0,
2641 in6_dev)) {
2642 addr_flags |= IFA_F_STABLE_PRIVACY;
2643 goto ok;
2644 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2645 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2646 goto put;
2647 } else {
2648 dev_addr_generated = true;
2649 }
2650 goto ok;
2651 }
2652 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2653 pinfo->prefix_len);
2654 goto put;
2655
2656 ok:
2657 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2658 &addr, addr_type,
2659 addr_flags, sllao,
2660 tokenized, valid_lft,
2661 prefered_lft);
2662 if (err)
2663 goto put;
2664
2665 /* Ignore error case here because previous prefix add addr was
2666 * successful which will be notified.
2667 */
2668 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2669 addr_type, addr_flags, sllao,
2670 tokenized, valid_lft,
2671 prefered_lft,
2672 dev_addr_generated);
2673 }
2674 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2675 put:
2676 in6_dev_put(in6_dev);
2677 }
2678
2679 /*
2680 * Set destination address.
2681 * Special case for SIT interfaces where we create a new "virtual"
2682 * device.
2683 */
2684 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2685 {
2686 struct in6_ifreq ireq;
2687 struct net_device *dev;
2688 int err = -EINVAL;
2689
2690 rtnl_lock();
2691
2692 err = -EFAULT;
2693 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2694 goto err_exit;
2695
2696 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2697
2698 err = -ENODEV;
2699 if (!dev)
2700 goto err_exit;
2701
2702 #if IS_ENABLED(CONFIG_IPV6_SIT)
2703 if (dev->type == ARPHRD_SIT) {
2704 const struct net_device_ops *ops = dev->netdev_ops;
2705 struct ifreq ifr;
2706 struct ip_tunnel_parm p;
2707
2708 err = -EADDRNOTAVAIL;
2709 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2710 goto err_exit;
2711
2712 memset(&p, 0, sizeof(p));
2713 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2714 p.iph.saddr = 0;
2715 p.iph.version = 4;
2716 p.iph.ihl = 5;
2717 p.iph.protocol = IPPROTO_IPV6;
2718 p.iph.ttl = 64;
2719 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2720
2721 if (ops->ndo_do_ioctl) {
2722 mm_segment_t oldfs = get_fs();
2723
2724 set_fs(KERNEL_DS);
2725 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2726 set_fs(oldfs);
2727 } else
2728 err = -EOPNOTSUPP;
2729
2730 if (err == 0) {
2731 err = -ENOBUFS;
2732 dev = __dev_get_by_name(net, p.name);
2733 if (!dev)
2734 goto err_exit;
2735 err = dev_open(dev);
2736 }
2737 }
2738 #endif
2739
2740 err_exit:
2741 rtnl_unlock();
2742 return err;
2743 }
2744
2745 static int ipv6_mc_config(struct sock *sk, bool join,
2746 const struct in6_addr *addr, int ifindex)
2747 {
2748 int ret;
2749
2750 ASSERT_RTNL();
2751
2752 lock_sock(sk);
2753 if (join)
2754 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2755 else
2756 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2757 release_sock(sk);
2758
2759 return ret;
2760 }
2761
2762 /*
2763 * Manual configuration of address on an interface
2764 */
2765 static int inet6_addr_add(struct net *net, int ifindex,
2766 const struct in6_addr *pfx,
2767 const struct in6_addr *peer_pfx,
2768 unsigned int plen, __u32 ifa_flags,
2769 __u32 prefered_lft, __u32 valid_lft)
2770 {
2771 struct inet6_ifaddr *ifp;
2772 struct inet6_dev *idev;
2773 struct net_device *dev;
2774 unsigned long timeout;
2775 clock_t expires;
2776 int scope;
2777 u32 flags;
2778
2779 ASSERT_RTNL();
2780
2781 if (plen > 128)
2782 return -EINVAL;
2783
2784 /* check the lifetime */
2785 if (!valid_lft || prefered_lft > valid_lft)
2786 return -EINVAL;
2787
2788 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2789 return -EINVAL;
2790
2791 dev = __dev_get_by_index(net, ifindex);
2792 if (!dev)
2793 return -ENODEV;
2794
2795 idev = addrconf_add_dev(dev);
2796 if (IS_ERR(idev))
2797 return PTR_ERR(idev);
2798
2799 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2800 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2801 true, pfx, ifindex);
2802
2803 if (ret < 0)
2804 return ret;
2805 }
2806
2807 scope = ipv6_addr_scope(pfx);
2808
2809 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2810 if (addrconf_finite_timeout(timeout)) {
2811 expires = jiffies_to_clock_t(timeout * HZ);
2812 valid_lft = timeout;
2813 flags = RTF_EXPIRES;
2814 } else {
2815 expires = 0;
2816 flags = 0;
2817 ifa_flags |= IFA_F_PERMANENT;
2818 }
2819
2820 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2821 if (addrconf_finite_timeout(timeout)) {
2822 if (timeout == 0)
2823 ifa_flags |= IFA_F_DEPRECATED;
2824 prefered_lft = timeout;
2825 }
2826
2827 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2828 valid_lft, prefered_lft);
2829
2830 if (!IS_ERR(ifp)) {
2831 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2832 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2833 expires, flags);
2834 }
2835
2836 /*
2837 * Note that section 3.1 of RFC 4429 indicates
2838 * that the Optimistic flag should not be set for
2839 * manually configured addresses
2840 */
2841 addrconf_dad_start(ifp);
2842 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2843 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2844 true, jiffies);
2845 in6_ifa_put(ifp);
2846 addrconf_verify_rtnl();
2847 return 0;
2848 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2849 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2850 false, pfx, ifindex);
2851 }
2852
2853 return PTR_ERR(ifp);
2854 }
2855
2856 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2857 const struct in6_addr *pfx, unsigned int plen)
2858 {
2859 struct inet6_ifaddr *ifp;
2860 struct inet6_dev *idev;
2861 struct net_device *dev;
2862
2863 if (plen > 128)
2864 return -EINVAL;
2865
2866 dev = __dev_get_by_index(net, ifindex);
2867 if (!dev)
2868 return -ENODEV;
2869
2870 idev = __in6_dev_get(dev);
2871 if (!idev)
2872 return -ENXIO;
2873
2874 read_lock_bh(&idev->lock);
2875 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2876 if (ifp->prefix_len == plen &&
2877 ipv6_addr_equal(pfx, &ifp->addr)) {
2878 in6_ifa_hold(ifp);
2879 read_unlock_bh(&idev->lock);
2880
2881 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2882 (ifa_flags & IFA_F_MANAGETEMPADDR))
2883 manage_tempaddrs(idev, ifp, 0, 0, false,
2884 jiffies);
2885 ipv6_del_addr(ifp);
2886 addrconf_verify_rtnl();
2887 if (ipv6_addr_is_multicast(pfx)) {
2888 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2889 false, pfx, dev->ifindex);
2890 }
2891 return 0;
2892 }
2893 }
2894 read_unlock_bh(&idev->lock);
2895 return -EADDRNOTAVAIL;
2896 }
2897
2898
2899 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2900 {
2901 struct in6_ifreq ireq;
2902 int err;
2903
2904 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2905 return -EPERM;
2906
2907 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2908 return -EFAULT;
2909
2910 rtnl_lock();
2911 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2912 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2913 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2914 rtnl_unlock();
2915 return err;
2916 }
2917
2918 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2919 {
2920 struct in6_ifreq ireq;
2921 int err;
2922
2923 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2924 return -EPERM;
2925
2926 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2927 return -EFAULT;
2928
2929 rtnl_lock();
2930 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2931 ireq.ifr6_prefixlen);
2932 rtnl_unlock();
2933 return err;
2934 }
2935
2936 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2937 int plen, int scope)
2938 {
2939 struct inet6_ifaddr *ifp;
2940
2941 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2942 scope, IFA_F_PERMANENT,
2943 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2944 if (!IS_ERR(ifp)) {
2945 spin_lock_bh(&ifp->lock);
2946 ifp->flags &= ~IFA_F_TENTATIVE;
2947 spin_unlock_bh(&ifp->lock);
2948 rt_genid_bump_ipv6(dev_net(idev->dev));
2949 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2950 in6_ifa_put(ifp);
2951 }
2952 }
2953
2954 #if IS_ENABLED(CONFIG_IPV6_SIT)
2955 static void sit_add_v4_addrs(struct inet6_dev *idev)
2956 {
2957 struct in6_addr addr;
2958 struct net_device *dev;
2959 struct net *net = dev_net(idev->dev);
2960 int scope, plen;
2961 u32 pflags = 0;
2962
2963 ASSERT_RTNL();
2964
2965 memset(&addr, 0, sizeof(struct in6_addr));
2966 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2967
2968 if (idev->dev->flags&IFF_POINTOPOINT) {
2969 addr.s6_addr32[0] = htonl(0xfe800000);
2970 scope = IFA_LINK;
2971 plen = 64;
2972 } else {
2973 scope = IPV6_ADDR_COMPATv4;
2974 plen = 96;
2975 pflags |= RTF_NONEXTHOP;
2976 }
2977
2978 if (addr.s6_addr32[3]) {
2979 add_addr(idev, &addr, plen, scope);
2980 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2981 return;
2982 }
2983
2984 for_each_netdev(net, dev) {
2985 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2986 if (in_dev && (dev->flags & IFF_UP)) {
2987 struct in_ifaddr *ifa;
2988
2989 int flag = scope;
2990
2991 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2992
2993 addr.s6_addr32[3] = ifa->ifa_local;
2994
2995 if (ifa->ifa_scope == RT_SCOPE_LINK)
2996 continue;
2997 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2998 if (idev->dev->flags&IFF_POINTOPOINT)
2999 continue;
3000 flag |= IFA_HOST;
3001 }
3002
3003 add_addr(idev, &addr, plen, flag);
3004 addrconf_prefix_route(&addr, plen, idev->dev, 0,
3005 pflags);
3006 }
3007 }
3008 }
3009 }
3010 #endif
3011
3012 static void init_loopback(struct net_device *dev)
3013 {
3014 struct inet6_dev *idev;
3015 struct net_device *sp_dev;
3016 struct inet6_ifaddr *sp_ifa;
3017 struct rt6_info *sp_rt;
3018
3019 /* ::1 */
3020
3021 ASSERT_RTNL();
3022
3023 idev = ipv6_find_idev(dev);
3024 if (!idev) {
3025 pr_debug("%s: add_dev failed\n", __func__);
3026 return;
3027 }
3028
3029 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3030
3031 /* Add routes to other interface's IPv6 addresses */
3032 for_each_netdev(dev_net(dev), sp_dev) {
3033 if (!strcmp(sp_dev->name, dev->name))
3034 continue;
3035
3036 idev = __in6_dev_get(sp_dev);
3037 if (!idev)
3038 continue;
3039
3040 read_lock_bh(&idev->lock);
3041 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3042
3043 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3044 continue;
3045
3046 if (sp_ifa->rt) {
3047 /* This dst has been added to garbage list when
3048 * lo device down, release this obsolete dst and
3049 * reallocate a new router for ifa.
3050 */
3051 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
3052 ip6_rt_put(sp_ifa->rt);
3053 sp_ifa->rt = NULL;
3054 } else {
3055 continue;
3056 }
3057 }
3058
3059 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3060
3061 /* Failure cases are ignored */
3062 if (!IS_ERR(sp_rt)) {
3063 sp_ifa->rt = sp_rt;
3064 ip6_ins_rt(sp_rt);
3065 }
3066 }
3067 read_unlock_bh(&idev->lock);
3068 }
3069 }
3070
3071 void addrconf_add_linklocal(struct inet6_dev *idev,
3072 const struct in6_addr *addr, u32 flags)
3073 {
3074 struct inet6_ifaddr *ifp;
3075 u32 addr_flags = flags | IFA_F_PERMANENT;
3076
3077 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3078 if (idev->cnf.optimistic_dad &&
3079 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3080 addr_flags |= IFA_F_OPTIMISTIC;
3081 #endif
3082
3083 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3084 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3085 if (!IS_ERR(ifp)) {
3086 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3087 addrconf_dad_start(ifp);
3088 in6_ifa_put(ifp);
3089 }
3090 }
3091 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3092
3093 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3094 {
3095 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3096 return true;
3097
3098 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3099 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3100 return true;
3101
3102 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3103 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3104 return true;
3105
3106 return false;
3107 }
3108
3109 static int ipv6_generate_stable_address(struct in6_addr *address,
3110 u8 dad_count,
3111 const struct inet6_dev *idev)
3112 {
3113 static DEFINE_SPINLOCK(lock);
3114 static __u32 digest[SHA_DIGEST_WORDS];
3115 static __u32 workspace[SHA_WORKSPACE_WORDS];
3116
3117 static union {
3118 char __data[SHA_MESSAGE_BYTES];
3119 struct {
3120 struct in6_addr secret;
3121 __be32 prefix[2];
3122 unsigned char hwaddr[MAX_ADDR_LEN];
3123 u8 dad_count;
3124 } __packed;
3125 } data;
3126
3127 struct in6_addr secret;
3128 struct in6_addr temp;
3129 struct net *net = dev_net(idev->dev);
3130
3131 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3132
3133 if (idev->cnf.stable_secret.initialized)
3134 secret = idev->cnf.stable_secret.secret;
3135 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3136 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3137 else
3138 return -1;
3139
3140 retry:
3141 spin_lock_bh(&lock);
3142
3143 sha_init(digest);
3144 memset(&data, 0, sizeof(data));
3145 memset(workspace, 0, sizeof(workspace));
3146 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3147 data.prefix[0] = address->s6_addr32[0];
3148 data.prefix[1] = address->s6_addr32[1];
3149 data.secret = secret;
3150 data.dad_count = dad_count;
3151
3152 sha_transform(digest, data.__data, workspace);
3153
3154 temp = *address;
3155 temp.s6_addr32[2] = (__force __be32)digest[0];
3156 temp.s6_addr32[3] = (__force __be32)digest[1];
3157
3158 spin_unlock_bh(&lock);
3159
3160 if (ipv6_reserved_interfaceid(temp)) {
3161 dad_count++;
3162 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3163 return -1;
3164 goto retry;
3165 }
3166
3167 *address = temp;
3168 return 0;
3169 }
3170
3171 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3172 {
3173 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3174
3175 if (s->initialized)
3176 return;
3177 s = &idev->cnf.stable_secret;
3178 get_random_bytes(&s->secret, sizeof(s->secret));
3179 s->initialized = true;
3180 }
3181
3182 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3183 {
3184 struct in6_addr addr;
3185
3186 /* no link local addresses on L3 master devices */
3187 if (netif_is_l3_master(idev->dev))
3188 return;
3189
3190 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3191
3192 switch (idev->cnf.addr_gen_mode) {
3193 case IN6_ADDR_GEN_MODE_RANDOM:
3194 ipv6_gen_mode_random_init(idev);
3195 /* fallthrough */
3196 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3197 if (!ipv6_generate_stable_address(&addr, 0, idev))
3198 addrconf_add_linklocal(idev, &addr,
3199 IFA_F_STABLE_PRIVACY);
3200 else if (prefix_route)
3201 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3202 break;
3203 case IN6_ADDR_GEN_MODE_EUI64:
3204 /* addrconf_add_linklocal also adds a prefix_route and we
3205 * only need to care about prefix routes if ipv6_generate_eui64
3206 * couldn't generate one.
3207 */
3208 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3209 addrconf_add_linklocal(idev, &addr, 0);
3210 else if (prefix_route)
3211 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3212 break;
3213 case IN6_ADDR_GEN_MODE_NONE:
3214 default:
3215 /* will not add any link local address */
3216 break;
3217 }
3218 }
3219
3220 static void addrconf_dev_config(struct net_device *dev)
3221 {
3222 struct inet6_dev *idev;
3223
3224 ASSERT_RTNL();
3225
3226 if ((dev->type != ARPHRD_ETHER) &&
3227 (dev->type != ARPHRD_FDDI) &&
3228 (dev->type != ARPHRD_ARCNET) &&
3229 (dev->type != ARPHRD_INFINIBAND) &&
3230 (dev->type != ARPHRD_IEEE1394) &&
3231 (dev->type != ARPHRD_TUNNEL6) &&
3232 (dev->type != ARPHRD_6LOWPAN) &&
3233 (dev->type != ARPHRD_IP6GRE) &&
3234 (dev->type != ARPHRD_IPGRE) &&
3235 (dev->type != ARPHRD_TUNNEL) &&
3236 (dev->type != ARPHRD_NONE)) {
3237 /* Alas, we support only Ethernet autoconfiguration. */
3238 return;
3239 }
3240
3241 idev = addrconf_add_dev(dev);
3242 if (IS_ERR(idev))
3243 return;
3244
3245 /* this device type has no EUI support */
3246 if (dev->type == ARPHRD_NONE &&
3247 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3248 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3249
3250 addrconf_addr_gen(idev, false);
3251 }
3252
3253 #if IS_ENABLED(CONFIG_IPV6_SIT)
3254 static void addrconf_sit_config(struct net_device *dev)
3255 {
3256 struct inet6_dev *idev;
3257
3258 ASSERT_RTNL();
3259
3260 /*
3261 * Configure the tunnel with one of our IPv4
3262 * addresses... we should configure all of
3263 * our v4 addrs in the tunnel
3264 */
3265
3266 idev = ipv6_find_idev(dev);
3267 if (!idev) {
3268 pr_debug("%s: add_dev failed\n", __func__);
3269 return;
3270 }
3271
3272 if (dev->priv_flags & IFF_ISATAP) {
3273 addrconf_addr_gen(idev, false);
3274 return;
3275 }
3276
3277 sit_add_v4_addrs(idev);
3278
3279 if (dev->flags&IFF_POINTOPOINT)
3280 addrconf_add_mroute(dev);
3281 }
3282 #endif
3283
3284 #if IS_ENABLED(CONFIG_NET_IPGRE)
3285 static void addrconf_gre_config(struct net_device *dev)
3286 {
3287 struct inet6_dev *idev;
3288
3289 ASSERT_RTNL();
3290
3291 idev = ipv6_find_idev(dev);
3292 if (!idev) {
3293 pr_debug("%s: add_dev failed\n", __func__);
3294 return;
3295 }
3296
3297 addrconf_addr_gen(idev, true);
3298 if (dev->flags & IFF_POINTOPOINT)
3299 addrconf_add_mroute(dev);
3300 }
3301 #endif
3302
3303 static int fixup_permanent_addr(struct inet6_dev *idev,
3304 struct inet6_ifaddr *ifp)
3305 {
3306 /* rt6i_ref == 0 means the host route was removed from the
3307 * FIB, for example, if 'lo' device is taken down. In that
3308 * case regenerate the host route.
3309 */
3310 if (!ifp->rt || !atomic_read(&ifp->rt->rt6i_ref)) {
3311 struct rt6_info *rt, *prev;
3312
3313 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3314 if (unlikely(IS_ERR(rt)))
3315 return PTR_ERR(rt);
3316
3317 /* ifp->rt can be accessed outside of rtnl */
3318 spin_lock(&ifp->lock);
3319 prev = ifp->rt;
3320 ifp->rt = rt;
3321 spin_unlock(&ifp->lock);
3322
3323 ip6_rt_put(prev);
3324 }
3325
3326 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3327 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3328 idev->dev, 0, 0);
3329 }
3330
3331 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3332 addrconf_dad_start(ifp);
3333
3334 return 0;
3335 }
3336
3337 static void addrconf_permanent_addr(struct net_device *dev)
3338 {
3339 struct inet6_ifaddr *ifp, *tmp;
3340 struct inet6_dev *idev;
3341
3342 idev = __in6_dev_get(dev);
3343 if (!idev)
3344 return;
3345
3346 write_lock_bh(&idev->lock);
3347
3348 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3349 if ((ifp->flags & IFA_F_PERMANENT) &&
3350 fixup_permanent_addr(idev, ifp) < 0) {
3351 write_unlock_bh(&idev->lock);
3352 ipv6_del_addr(ifp);
3353 write_lock_bh(&idev->lock);
3354
3355 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3356 idev->dev->name, &ifp->addr);
3357 }
3358 }
3359
3360 write_unlock_bh(&idev->lock);
3361 }
3362
3363 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3364 void *ptr)
3365 {
3366 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3367 struct netdev_notifier_changeupper_info *info;
3368 struct inet6_dev *idev = __in6_dev_get(dev);
3369 int run_pending = 0;
3370 int err;
3371
3372 switch (event) {
3373 case NETDEV_REGISTER:
3374 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3375 idev = ipv6_add_dev(dev);
3376 if (IS_ERR(idev))
3377 return notifier_from_errno(PTR_ERR(idev));
3378 }
3379 break;
3380
3381 case NETDEV_CHANGEMTU:
3382 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3383 if (dev->mtu < IPV6_MIN_MTU) {
3384 addrconf_ifdown(dev, 1);
3385 break;
3386 }
3387
3388 if (idev) {
3389 rt6_mtu_change(dev, dev->mtu);
3390 idev->cnf.mtu6 = dev->mtu;
3391 break;
3392 }
3393
3394 /* allocate new idev */
3395 idev = ipv6_add_dev(dev);
3396 if (IS_ERR(idev))
3397 break;
3398
3399 /* device is still not ready */
3400 if (!(idev->if_flags & IF_READY))
3401 break;
3402
3403 run_pending = 1;
3404
3405 /* fall through */
3406
3407 case NETDEV_UP:
3408 case NETDEV_CHANGE:
3409 if (dev->flags & IFF_SLAVE)
3410 break;
3411
3412 if (idev && idev->cnf.disable_ipv6)
3413 break;
3414
3415 if (event == NETDEV_UP) {
3416 /* restore routes for permanent addresses */
3417 addrconf_permanent_addr(dev);
3418
3419 if (!addrconf_qdisc_ok(dev)) {
3420 /* device is not ready yet. */
3421 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3422 dev->name);
3423 break;
3424 }
3425
3426 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3427 idev = ipv6_add_dev(dev);
3428
3429 if (!IS_ERR_OR_NULL(idev)) {
3430 idev->if_flags |= IF_READY;
3431 run_pending = 1;
3432 }
3433 } else if (event == NETDEV_CHANGE) {
3434 if (!addrconf_qdisc_ok(dev)) {
3435 /* device is still not ready. */
3436 break;
3437 }
3438
3439 if (idev) {
3440 if (idev->if_flags & IF_READY) {
3441 /* device is already configured -
3442 * but resend MLD reports, we might
3443 * have roamed and need to update
3444 * multicast snooping switches
3445 */
3446 ipv6_mc_up(idev);
3447 break;
3448 }
3449 idev->if_flags |= IF_READY;
3450 }
3451
3452 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3453 dev->name);
3454
3455 run_pending = 1;
3456 }
3457
3458 switch (dev->type) {
3459 #if IS_ENABLED(CONFIG_IPV6_SIT)
3460 case ARPHRD_SIT:
3461 addrconf_sit_config(dev);
3462 break;
3463 #endif
3464 #if IS_ENABLED(CONFIG_NET_IPGRE)
3465 case ARPHRD_IPGRE:
3466 addrconf_gre_config(dev);
3467 break;
3468 #endif
3469 case ARPHRD_LOOPBACK:
3470 init_loopback(dev);
3471 break;
3472
3473 default:
3474 addrconf_dev_config(dev);
3475 break;
3476 }
3477
3478 if (!IS_ERR_OR_NULL(idev)) {
3479 if (run_pending)
3480 addrconf_dad_run(idev);
3481
3482 /*
3483 * If the MTU changed during the interface down,
3484 * when the interface up, the changed MTU must be
3485 * reflected in the idev as well as routers.
3486 */
3487 if (idev->cnf.mtu6 != dev->mtu &&
3488 dev->mtu >= IPV6_MIN_MTU) {
3489 rt6_mtu_change(dev, dev->mtu);
3490 idev->cnf.mtu6 = dev->mtu;
3491 }
3492 idev->tstamp = jiffies;
3493 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3494
3495 /*
3496 * If the changed mtu during down is lower than
3497 * IPV6_MIN_MTU stop IPv6 on this interface.
3498 */
3499 if (dev->mtu < IPV6_MIN_MTU)
3500 addrconf_ifdown(dev, 1);
3501 }
3502 break;
3503
3504 case NETDEV_DOWN:
3505 case NETDEV_UNREGISTER:
3506 /*
3507 * Remove all addresses from this interface.
3508 */
3509 addrconf_ifdown(dev, event != NETDEV_DOWN);
3510 break;
3511
3512 case NETDEV_CHANGENAME:
3513 if (idev) {
3514 snmp6_unregister_dev(idev);
3515 addrconf_sysctl_unregister(idev);
3516 err = addrconf_sysctl_register(idev);
3517 if (err)
3518 return notifier_from_errno(err);
3519 err = snmp6_register_dev(idev);
3520 if (err) {
3521 addrconf_sysctl_unregister(idev);
3522 return notifier_from_errno(err);
3523 }
3524 }
3525 break;
3526
3527 case NETDEV_PRE_TYPE_CHANGE:
3528 case NETDEV_POST_TYPE_CHANGE:
3529 if (idev)
3530 addrconf_type_change(dev, event);
3531 break;
3532
3533 case NETDEV_CHANGEUPPER:
3534 info = ptr;
3535
3536 /* flush all routes if dev is linked to or unlinked from
3537 * an L3 master device (e.g., VRF)
3538 */
3539 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3540 addrconf_ifdown(dev, 0);
3541 }
3542
3543 return NOTIFY_OK;
3544 }
3545
3546 /*
3547 * addrconf module should be notified of a device going up
3548 */
3549 static struct notifier_block ipv6_dev_notf = {
3550 .notifier_call = addrconf_notify,
3551 .priority = ADDRCONF_NOTIFY_PRIORITY,
3552 };
3553
3554 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3555 {
3556 struct inet6_dev *idev;
3557 ASSERT_RTNL();
3558
3559 idev = __in6_dev_get(dev);
3560
3561 if (event == NETDEV_POST_TYPE_CHANGE)
3562 ipv6_mc_remap(idev);
3563 else if (event == NETDEV_PRE_TYPE_CHANGE)
3564 ipv6_mc_unmap(idev);
3565 }
3566
3567 static bool addr_is_local(const struct in6_addr *addr)
3568 {
3569 return ipv6_addr_type(addr) &
3570 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3571 }
3572
3573 static int addrconf_ifdown(struct net_device *dev, int how)
3574 {
3575 struct net *net = dev_net(dev);
3576 struct inet6_dev *idev;
3577 struct inet6_ifaddr *ifa, *tmp;
3578 struct list_head del_list;
3579 int _keep_addr;
3580 bool keep_addr;
3581 int state, i;
3582
3583 ASSERT_RTNL();
3584
3585 rt6_ifdown(net, dev);
3586 neigh_ifdown(&nd_tbl, dev);
3587
3588 idev = __in6_dev_get(dev);
3589 if (!idev)
3590 return -ENODEV;
3591
3592 /*
3593 * Step 1: remove reference to ipv6 device from parent device.
3594 * Do not dev_put!
3595 */
3596 if (how) {
3597 idev->dead = 1;
3598
3599 /* protected by rtnl_lock */
3600 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3601
3602 /* Step 1.5: remove snmp6 entry */
3603 snmp6_unregister_dev(idev);
3604
3605 }
3606
3607 /* aggregate the system setting and interface setting */
3608 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3609 if (!_keep_addr)
3610 _keep_addr = idev->cnf.keep_addr_on_down;
3611
3612 /* combine the user config with event to determine if permanent
3613 * addresses are to be removed from address hash table
3614 */
3615 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3616
3617 /* Step 2: clear hash table */
3618 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3619 struct hlist_head *h = &inet6_addr_lst[i];
3620
3621 spin_lock_bh(&addrconf_hash_lock);
3622 restart:
3623 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3624 if (ifa->idev == idev) {
3625 addrconf_del_dad_work(ifa);
3626 /* combined flag + permanent flag decide if
3627 * address is retained on a down event
3628 */
3629 if (!keep_addr ||
3630 !(ifa->flags & IFA_F_PERMANENT) ||
3631 addr_is_local(&ifa->addr)) {
3632 hlist_del_init_rcu(&ifa->addr_lst);
3633 goto restart;
3634 }
3635 }
3636 }
3637 spin_unlock_bh(&addrconf_hash_lock);
3638 }
3639
3640 write_lock_bh(&idev->lock);
3641
3642 addrconf_del_rs_timer(idev);
3643
3644 /* Step 2: clear flags for stateless addrconf */
3645 if (!how)
3646 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3647
3648 /* Step 3: clear tempaddr list */
3649 while (!list_empty(&idev->tempaddr_list)) {
3650 ifa = list_first_entry(&idev->tempaddr_list,
3651 struct inet6_ifaddr, tmp_list);
3652 list_del(&ifa->tmp_list);
3653 write_unlock_bh(&idev->lock);
3654 spin_lock_bh(&ifa->lock);
3655
3656 if (ifa->ifpub) {
3657 in6_ifa_put(ifa->ifpub);
3658 ifa->ifpub = NULL;
3659 }
3660 spin_unlock_bh(&ifa->lock);
3661 in6_ifa_put(ifa);
3662 write_lock_bh(&idev->lock);
3663 }
3664
3665 /* re-combine the user config with event to determine if permanent
3666 * addresses are to be removed from the interface list
3667 */
3668 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3669
3670 INIT_LIST_HEAD(&del_list);
3671 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3672 struct rt6_info *rt = NULL;
3673 bool keep;
3674
3675 addrconf_del_dad_work(ifa);
3676
3677 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3678 !addr_is_local(&ifa->addr);
3679 if (!keep)
3680 list_move(&ifa->if_list, &del_list);
3681
3682 write_unlock_bh(&idev->lock);
3683 spin_lock_bh(&ifa->lock);
3684
3685 if (keep) {
3686 /* set state to skip the notifier below */
3687 state = INET6_IFADDR_STATE_DEAD;
3688 ifa->state = INET6_IFADDR_STATE_PREDAD;
3689 if (!(ifa->flags & IFA_F_NODAD))
3690 ifa->flags |= IFA_F_TENTATIVE;
3691
3692 rt = ifa->rt;
3693 ifa->rt = NULL;
3694 } else {
3695 state = ifa->state;
3696 ifa->state = INET6_IFADDR_STATE_DEAD;
3697 }
3698
3699 spin_unlock_bh(&ifa->lock);
3700
3701 if (rt)
3702 ip6_del_rt(rt);
3703
3704 if (state != INET6_IFADDR_STATE_DEAD) {
3705 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3706 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3707 } else {
3708 if (idev->cnf.forwarding)
3709 addrconf_leave_anycast(ifa);
3710 addrconf_leave_solict(ifa->idev, &ifa->addr);
3711 }
3712
3713 write_lock_bh(&idev->lock);
3714 }
3715
3716 write_unlock_bh(&idev->lock);
3717
3718 /* now clean up addresses to be removed */
3719 while (!list_empty(&del_list)) {
3720 ifa = list_first_entry(&del_list,
3721 struct inet6_ifaddr, if_list);
3722 list_del(&ifa->if_list);
3723
3724 in6_ifa_put(ifa);
3725 }
3726
3727 /* Step 5: Discard anycast and multicast list */
3728 if (how) {
3729 ipv6_ac_destroy_dev(idev);
3730 ipv6_mc_destroy_dev(idev);
3731 } else {
3732 ipv6_mc_down(idev);
3733 }
3734
3735 idev->tstamp = jiffies;
3736
3737 /* Last: Shot the device (if unregistered) */
3738 if (how) {
3739 addrconf_sysctl_unregister(idev);
3740 neigh_parms_release(&nd_tbl, idev->nd_parms);
3741 neigh_ifdown(&nd_tbl, dev);
3742 in6_dev_put(idev);
3743 }
3744 return 0;
3745 }
3746
3747 static void addrconf_rs_timer(unsigned long data)
3748 {
3749 struct inet6_dev *idev = (struct inet6_dev *)data;
3750 struct net_device *dev = idev->dev;
3751 struct in6_addr lladdr;
3752
3753 write_lock(&idev->lock);
3754 if (idev->dead || !(idev->if_flags & IF_READY))
3755 goto out;
3756
3757 if (!ipv6_accept_ra(idev))
3758 goto out;
3759
3760 /* Announcement received after solicitation was sent */
3761 if (idev->if_flags & IF_RA_RCVD)
3762 goto out;
3763
3764 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3765 write_unlock(&idev->lock);
3766 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3767 ndisc_send_rs(dev, &lladdr,
3768 &in6addr_linklocal_allrouters);
3769 else
3770 goto put;
3771
3772 write_lock(&idev->lock);
3773 idev->rs_interval = rfc3315_s14_backoff_update(
3774 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3775 /* The wait after the last probe can be shorter */
3776 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3777 idev->cnf.rtr_solicits) ?
3778 idev->cnf.rtr_solicit_delay :
3779 idev->rs_interval);
3780 } else {
3781 /*
3782 * Note: we do not support deprecated "all on-link"
3783 * assumption any longer.
3784 */
3785 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3786 }
3787
3788 out:
3789 write_unlock(&idev->lock);
3790 put:
3791 in6_dev_put(idev);
3792 }
3793
3794 /*
3795 * Duplicate Address Detection
3796 */
3797 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3798 {
3799 unsigned long rand_num;
3800 struct inet6_dev *idev = ifp->idev;
3801 u64 nonce;
3802
3803 if (ifp->flags & IFA_F_OPTIMISTIC)
3804 rand_num = 0;
3805 else
3806 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3807
3808 nonce = 0;
3809 if (idev->cnf.enhanced_dad ||
3810 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3811 do
3812 get_random_bytes(&nonce, 6);
3813 while (nonce == 0);
3814 }
3815 ifp->dad_nonce = nonce;
3816 ifp->dad_probes = idev->cnf.dad_transmits;
3817 addrconf_mod_dad_work(ifp, rand_num);
3818 }
3819
3820 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3821 {
3822 struct inet6_dev *idev = ifp->idev;
3823 struct net_device *dev = idev->dev;
3824 bool bump_id, notify = false;
3825
3826 addrconf_join_solict(dev, &ifp->addr);
3827
3828 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3829
3830 read_lock_bh(&idev->lock);
3831 spin_lock(&ifp->lock);
3832 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3833 goto out;
3834
3835 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3836 idev->cnf.accept_dad < 1 ||
3837 !(ifp->flags&IFA_F_TENTATIVE) ||
3838 ifp->flags & IFA_F_NODAD) {
3839 bump_id = ifp->flags & IFA_F_TENTATIVE;
3840 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3841 spin_unlock(&ifp->lock);
3842 read_unlock_bh(&idev->lock);
3843
3844 addrconf_dad_completed(ifp, bump_id);
3845 return;
3846 }
3847
3848 if (!(idev->if_flags & IF_READY)) {
3849 spin_unlock(&ifp->lock);
3850 read_unlock_bh(&idev->lock);
3851 /*
3852 * If the device is not ready:
3853 * - keep it tentative if it is a permanent address.
3854 * - otherwise, kill it.
3855 */
3856 in6_ifa_hold(ifp);
3857 addrconf_dad_stop(ifp, 0);
3858 return;
3859 }
3860
3861 /*
3862 * Optimistic nodes can start receiving
3863 * Frames right away
3864 */
3865 if (ifp->flags & IFA_F_OPTIMISTIC) {
3866 ip6_ins_rt(ifp->rt);
3867 if (ipv6_use_optimistic_addr(idev)) {
3868 /* Because optimistic nodes can use this address,
3869 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3870 */
3871 notify = true;
3872 }
3873 }
3874
3875 addrconf_dad_kick(ifp);
3876 out:
3877 spin_unlock(&ifp->lock);
3878 read_unlock_bh(&idev->lock);
3879 if (notify)
3880 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3881 }
3882
3883 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3884 {
3885 bool begin_dad = false;
3886
3887 spin_lock_bh(&ifp->lock);
3888 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3889 ifp->state = INET6_IFADDR_STATE_PREDAD;
3890 begin_dad = true;
3891 }
3892 spin_unlock_bh(&ifp->lock);
3893
3894 if (begin_dad)
3895 addrconf_mod_dad_work(ifp, 0);
3896 }
3897
3898 static void addrconf_dad_work(struct work_struct *w)
3899 {
3900 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3901 struct inet6_ifaddr,
3902 dad_work);
3903 struct inet6_dev *idev = ifp->idev;
3904 bool bump_id, disable_ipv6 = false;
3905 struct in6_addr mcaddr;
3906
3907 enum {
3908 DAD_PROCESS,
3909 DAD_BEGIN,
3910 DAD_ABORT,
3911 } action = DAD_PROCESS;
3912
3913 rtnl_lock();
3914
3915 spin_lock_bh(&ifp->lock);
3916 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3917 action = DAD_BEGIN;
3918 ifp->state = INET6_IFADDR_STATE_DAD;
3919 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3920 action = DAD_ABORT;
3921 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3922
3923 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3924 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3925 struct in6_addr addr;
3926
3927 addr.s6_addr32[0] = htonl(0xfe800000);
3928 addr.s6_addr32[1] = 0;
3929
3930 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3931 ipv6_addr_equal(&ifp->addr, &addr)) {
3932 /* DAD failed for link-local based on MAC */
3933 idev->cnf.disable_ipv6 = 1;
3934
3935 pr_info("%s: IPv6 being disabled!\n",
3936 ifp->idev->dev->name);
3937 disable_ipv6 = true;
3938 }
3939 }
3940 }
3941 spin_unlock_bh(&ifp->lock);
3942
3943 if (action == DAD_BEGIN) {
3944 addrconf_dad_begin(ifp);
3945 goto out;
3946 } else if (action == DAD_ABORT) {
3947 in6_ifa_hold(ifp);
3948 addrconf_dad_stop(ifp, 1);
3949 if (disable_ipv6)
3950 addrconf_ifdown(idev->dev, 0);
3951 goto out;
3952 }
3953
3954 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3955 goto out;
3956
3957 write_lock_bh(&idev->lock);
3958 if (idev->dead || !(idev->if_flags & IF_READY)) {
3959 write_unlock_bh(&idev->lock);
3960 goto out;
3961 }
3962
3963 spin_lock(&ifp->lock);
3964 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3965 spin_unlock(&ifp->lock);
3966 write_unlock_bh(&idev->lock);
3967 goto out;
3968 }
3969
3970 if (ifp->dad_probes == 0) {
3971 /*
3972 * DAD was successful
3973 */
3974
3975 bump_id = ifp->flags & IFA_F_TENTATIVE;
3976 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3977 spin_unlock(&ifp->lock);
3978 write_unlock_bh(&idev->lock);
3979
3980 addrconf_dad_completed(ifp, bump_id);
3981
3982 goto out;
3983 }
3984
3985 ifp->dad_probes--;
3986 addrconf_mod_dad_work(ifp,
3987 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3988 spin_unlock(&ifp->lock);
3989 write_unlock_bh(&idev->lock);
3990
3991 /* send a neighbour solicitation for our addr */
3992 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3993 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3994 ifp->dad_nonce);
3995 out:
3996 in6_ifa_put(ifp);
3997 rtnl_unlock();
3998 }
3999
4000 /* ifp->idev must be at least read locked */
4001 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4002 {
4003 struct inet6_ifaddr *ifpiter;
4004 struct inet6_dev *idev = ifp->idev;
4005
4006 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4007 if (ifpiter->scope > IFA_LINK)
4008 break;
4009 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4010 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4011 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4012 IFA_F_PERMANENT)
4013 return false;
4014 }
4015 return true;
4016 }
4017
4018 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
4019 {
4020 struct net_device *dev = ifp->idev->dev;
4021 struct in6_addr lladdr;
4022 bool send_rs, send_mld;
4023
4024 addrconf_del_dad_work(ifp);
4025
4026 /*
4027 * Configure the address for reception. Now it is valid.
4028 */
4029
4030 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4031
4032 /* If added prefix is link local and we are prepared to process
4033 router advertisements, start sending router solicitations.
4034 */
4035
4036 read_lock_bh(&ifp->idev->lock);
4037 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4038 send_rs = send_mld &&
4039 ipv6_accept_ra(ifp->idev) &&
4040 ifp->idev->cnf.rtr_solicits != 0 &&
4041 (dev->flags&IFF_LOOPBACK) == 0;
4042 read_unlock_bh(&ifp->idev->lock);
4043
4044 /* While dad is in progress mld report's source address is in6_addrany.
4045 * Resend with proper ll now.
4046 */
4047 if (send_mld)
4048 ipv6_mc_dad_complete(ifp->idev);
4049
4050 if (send_rs) {
4051 /*
4052 * If a host as already performed a random delay
4053 * [...] as part of DAD [...] there is no need
4054 * to delay again before sending the first RS
4055 */
4056 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4057 return;
4058 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4059
4060 write_lock_bh(&ifp->idev->lock);
4061 spin_lock(&ifp->lock);
4062 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4063 ifp->idev->cnf.rtr_solicit_interval);
4064 ifp->idev->rs_probes = 1;
4065 ifp->idev->if_flags |= IF_RS_SENT;
4066 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4067 spin_unlock(&ifp->lock);
4068 write_unlock_bh(&ifp->idev->lock);
4069 }
4070
4071 if (bump_id)
4072 rt_genid_bump_ipv6(dev_net(dev));
4073
4074 /* Make sure that a new temporary address will be created
4075 * before this temporary address becomes deprecated.
4076 */
4077 if (ifp->flags & IFA_F_TEMPORARY)
4078 addrconf_verify_rtnl();
4079 }
4080
4081 static void addrconf_dad_run(struct inet6_dev *idev)
4082 {
4083 struct inet6_ifaddr *ifp;
4084
4085 read_lock_bh(&idev->lock);
4086 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4087 spin_lock(&ifp->lock);
4088 if (ifp->flags & IFA_F_TENTATIVE &&
4089 ifp->state == INET6_IFADDR_STATE_DAD)
4090 addrconf_dad_kick(ifp);
4091 spin_unlock(&ifp->lock);
4092 }
4093 read_unlock_bh(&idev->lock);
4094 }
4095
4096 #ifdef CONFIG_PROC_FS
4097 struct if6_iter_state {
4098 struct seq_net_private p;
4099 int bucket;
4100 int offset;
4101 };
4102
4103 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4104 {
4105 struct inet6_ifaddr *ifa = NULL;
4106 struct if6_iter_state *state = seq->private;
4107 struct net *net = seq_file_net(seq);
4108 int p = 0;
4109
4110 /* initial bucket if pos is 0 */
4111 if (pos == 0) {
4112 state->bucket = 0;
4113 state->offset = 0;
4114 }
4115
4116 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4117 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4118 addr_lst) {
4119 if (!net_eq(dev_net(ifa->idev->dev), net))
4120 continue;
4121 /* sync with offset */
4122 if (p < state->offset) {
4123 p++;
4124 continue;
4125 }
4126 state->offset++;
4127 return ifa;
4128 }
4129
4130 /* prepare for next bucket */
4131 state->offset = 0;
4132 p = 0;
4133 }
4134 return NULL;
4135 }
4136
4137 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4138 struct inet6_ifaddr *ifa)
4139 {
4140 struct if6_iter_state *state = seq->private;
4141 struct net *net = seq_file_net(seq);
4142
4143 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4144 if (!net_eq(dev_net(ifa->idev->dev), net))
4145 continue;
4146 state->offset++;
4147 return ifa;
4148 }
4149
4150 while (++state->bucket < IN6_ADDR_HSIZE) {
4151 state->offset = 0;
4152 hlist_for_each_entry_rcu_bh(ifa,
4153 &inet6_addr_lst[state->bucket], addr_lst) {
4154 if (!net_eq(dev_net(ifa->idev->dev), net))
4155 continue;
4156 state->offset++;
4157 return ifa;
4158 }
4159 }
4160
4161 return NULL;
4162 }
4163
4164 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4165 __acquires(rcu_bh)
4166 {
4167 rcu_read_lock_bh();
4168 return if6_get_first(seq, *pos);
4169 }
4170
4171 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4172 {
4173 struct inet6_ifaddr *ifa;
4174
4175 ifa = if6_get_next(seq, v);
4176 ++*pos;
4177 return ifa;
4178 }
4179
4180 static void if6_seq_stop(struct seq_file *seq, void *v)
4181 __releases(rcu_bh)
4182 {
4183 rcu_read_unlock_bh();
4184 }
4185
4186 static int if6_seq_show(struct seq_file *seq, void *v)
4187 {
4188 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4189 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4190 &ifp->addr,
4191 ifp->idev->dev->ifindex,
4192 ifp->prefix_len,
4193 ifp->scope,
4194 (u8) ifp->flags,
4195 ifp->idev->dev->name);
4196 return 0;
4197 }
4198
4199 static const struct seq_operations if6_seq_ops = {
4200 .start = if6_seq_start,
4201 .next = if6_seq_next,
4202 .show = if6_seq_show,
4203 .stop = if6_seq_stop,
4204 };
4205
4206 static int if6_seq_open(struct inode *inode, struct file *file)
4207 {
4208 return seq_open_net(inode, file, &if6_seq_ops,
4209 sizeof(struct if6_iter_state));
4210 }
4211
4212 static const struct file_operations if6_fops = {
4213 .owner = THIS_MODULE,
4214 .open = if6_seq_open,
4215 .read = seq_read,
4216 .llseek = seq_lseek,
4217 .release = seq_release_net,
4218 };
4219
4220 static int __net_init if6_proc_net_init(struct net *net)
4221 {
4222 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4223 return -ENOMEM;
4224 return 0;
4225 }
4226
4227 static void __net_exit if6_proc_net_exit(struct net *net)
4228 {
4229 remove_proc_entry("if_inet6", net->proc_net);
4230 }
4231
4232 static struct pernet_operations if6_proc_net_ops = {
4233 .init = if6_proc_net_init,
4234 .exit = if6_proc_net_exit,
4235 };
4236
4237 int __init if6_proc_init(void)
4238 {
4239 return register_pernet_subsys(&if6_proc_net_ops);
4240 }
4241
4242 void if6_proc_exit(void)
4243 {
4244 unregister_pernet_subsys(&if6_proc_net_ops);
4245 }
4246 #endif /* CONFIG_PROC_FS */
4247
4248 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4249 /* Check if address is a home address configured on any interface. */
4250 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4251 {
4252 int ret = 0;
4253 struct inet6_ifaddr *ifp = NULL;
4254 unsigned int hash = inet6_addr_hash(addr);
4255
4256 rcu_read_lock_bh();
4257 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4258 if (!net_eq(dev_net(ifp->idev->dev), net))
4259 continue;
4260 if (ipv6_addr_equal(&ifp->addr, addr) &&
4261 (ifp->flags & IFA_F_HOMEADDRESS)) {
4262 ret = 1;
4263 break;
4264 }
4265 }
4266 rcu_read_unlock_bh();
4267 return ret;
4268 }
4269 #endif
4270
4271 /*
4272 * Periodic address status verification
4273 */
4274
4275 static void addrconf_verify_rtnl(void)
4276 {
4277 unsigned long now, next, next_sec, next_sched;
4278 struct inet6_ifaddr *ifp;
4279 int i;
4280
4281 ASSERT_RTNL();
4282
4283 rcu_read_lock_bh();
4284 now = jiffies;
4285 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4286
4287 cancel_delayed_work(&addr_chk_work);
4288
4289 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4290 restart:
4291 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4292 unsigned long age;
4293
4294 /* When setting preferred_lft to a value not zero or
4295 * infinity, while valid_lft is infinity
4296 * IFA_F_PERMANENT has a non-infinity life time.
4297 */
4298 if ((ifp->flags & IFA_F_PERMANENT) &&
4299 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4300 continue;
4301
4302 spin_lock(&ifp->lock);
4303 /* We try to batch several events at once. */
4304 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4305
4306 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4307 age >= ifp->valid_lft) {
4308 spin_unlock(&ifp->lock);
4309 in6_ifa_hold(ifp);
4310 ipv6_del_addr(ifp);
4311 goto restart;
4312 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4313 spin_unlock(&ifp->lock);
4314 continue;
4315 } else if (age >= ifp->prefered_lft) {
4316 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4317 int deprecate = 0;
4318
4319 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4320 deprecate = 1;
4321 ifp->flags |= IFA_F_DEPRECATED;
4322 }
4323
4324 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4325 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4326 next = ifp->tstamp + ifp->valid_lft * HZ;
4327
4328 spin_unlock(&ifp->lock);
4329
4330 if (deprecate) {
4331 in6_ifa_hold(ifp);
4332
4333 ipv6_ifa_notify(0, ifp);
4334 in6_ifa_put(ifp);
4335 goto restart;
4336 }
4337 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4338 !(ifp->flags&IFA_F_TENTATIVE)) {
4339 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4340 ifp->idev->cnf.dad_transmits *
4341 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4342
4343 if (age >= ifp->prefered_lft - regen_advance) {
4344 struct inet6_ifaddr *ifpub = ifp->ifpub;
4345 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4346 next = ifp->tstamp + ifp->prefered_lft * HZ;
4347 if (!ifp->regen_count && ifpub) {
4348 ifp->regen_count++;
4349 in6_ifa_hold(ifp);
4350 in6_ifa_hold(ifpub);
4351 spin_unlock(&ifp->lock);
4352
4353 spin_lock(&ifpub->lock);
4354 ifpub->regen_count = 0;
4355 spin_unlock(&ifpub->lock);
4356 ipv6_create_tempaddr(ifpub, ifp);
4357 in6_ifa_put(ifpub);
4358 in6_ifa_put(ifp);
4359 goto restart;
4360 }
4361 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4362 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4363 spin_unlock(&ifp->lock);
4364 } else {
4365 /* ifp->prefered_lft <= ifp->valid_lft */
4366 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4367 next = ifp->tstamp + ifp->prefered_lft * HZ;
4368 spin_unlock(&ifp->lock);
4369 }
4370 }
4371 }
4372
4373 next_sec = round_jiffies_up(next);
4374 next_sched = next;
4375
4376 /* If rounded timeout is accurate enough, accept it. */
4377 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4378 next_sched = next_sec;
4379
4380 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4381 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4382 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4383
4384 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4385 now, next, next_sec, next_sched);
4386 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4387 rcu_read_unlock_bh();
4388 }
4389
4390 static void addrconf_verify_work(struct work_struct *w)
4391 {
4392 rtnl_lock();
4393 addrconf_verify_rtnl();
4394 rtnl_unlock();
4395 }
4396
4397 static void addrconf_verify(void)
4398 {
4399 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4400 }
4401
4402 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4403 struct in6_addr **peer_pfx)
4404 {
4405 struct in6_addr *pfx = NULL;
4406
4407 *peer_pfx = NULL;
4408
4409 if (addr)
4410 pfx = nla_data(addr);
4411
4412 if (local) {
4413 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4414 *peer_pfx = pfx;
4415 pfx = nla_data(local);
4416 }
4417
4418 return pfx;
4419 }
4420
4421 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4422 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4423 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4424 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4425 [IFA_FLAGS] = { .len = sizeof(u32) },
4426 };
4427
4428 static int
4429 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4430 struct netlink_ext_ack *extack)
4431 {
4432 struct net *net = sock_net(skb->sk);
4433 struct ifaddrmsg *ifm;
4434 struct nlattr *tb[IFA_MAX+1];
4435 struct in6_addr *pfx, *peer_pfx;
4436 u32 ifa_flags;
4437 int err;
4438
4439 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4440 extack);
4441 if (err < 0)
4442 return err;
4443
4444 ifm = nlmsg_data(nlh);
4445 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4446 if (!pfx)
4447 return -EINVAL;
4448
4449 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4450
4451 /* We ignore other flags so far. */
4452 ifa_flags &= IFA_F_MANAGETEMPADDR;
4453
4454 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4455 ifm->ifa_prefixlen);
4456 }
4457
4458 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4459 u32 prefered_lft, u32 valid_lft)
4460 {
4461 u32 flags;
4462 clock_t expires;
4463 unsigned long timeout;
4464 bool was_managetempaddr;
4465 bool had_prefixroute;
4466
4467 ASSERT_RTNL();
4468
4469 if (!valid_lft || (prefered_lft > valid_lft))
4470 return -EINVAL;
4471
4472 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4473 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4474 return -EINVAL;
4475
4476 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4477 if (addrconf_finite_timeout(timeout)) {
4478 expires = jiffies_to_clock_t(timeout * HZ);
4479 valid_lft = timeout;
4480 flags = RTF_EXPIRES;
4481 } else {
4482 expires = 0;
4483 flags = 0;
4484 ifa_flags |= IFA_F_PERMANENT;
4485 }
4486
4487 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4488 if (addrconf_finite_timeout(timeout)) {
4489 if (timeout == 0)
4490 ifa_flags |= IFA_F_DEPRECATED;
4491 prefered_lft = timeout;
4492 }
4493
4494 spin_lock_bh(&ifp->lock);
4495 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4496 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4497 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4498 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4499 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4500 IFA_F_NOPREFIXROUTE);
4501 ifp->flags |= ifa_flags;
4502 ifp->tstamp = jiffies;
4503 ifp->valid_lft = valid_lft;
4504 ifp->prefered_lft = prefered_lft;
4505
4506 spin_unlock_bh(&ifp->lock);
4507 if (!(ifp->flags&IFA_F_TENTATIVE))
4508 ipv6_ifa_notify(0, ifp);
4509
4510 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4511 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4512 expires, flags);
4513 } else if (had_prefixroute) {
4514 enum cleanup_prefix_rt_t action;
4515 unsigned long rt_expires;
4516
4517 write_lock_bh(&ifp->idev->lock);
4518 action = check_cleanup_prefix_route(ifp, &rt_expires);
4519 write_unlock_bh(&ifp->idev->lock);
4520
4521 if (action != CLEANUP_PREFIX_RT_NOP) {
4522 cleanup_prefix_route(ifp, rt_expires,
4523 action == CLEANUP_PREFIX_RT_DEL);
4524 }
4525 }
4526
4527 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4528 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4529 valid_lft = prefered_lft = 0;
4530 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4531 !was_managetempaddr, jiffies);
4532 }
4533
4534 addrconf_verify_rtnl();
4535
4536 return 0;
4537 }
4538
4539 static int
4540 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4541 struct netlink_ext_ack *extack)
4542 {
4543 struct net *net = sock_net(skb->sk);
4544 struct ifaddrmsg *ifm;
4545 struct nlattr *tb[IFA_MAX+1];
4546 struct in6_addr *pfx, *peer_pfx;
4547 struct inet6_ifaddr *ifa;
4548 struct net_device *dev;
4549 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4550 u32 ifa_flags;
4551 int err;
4552
4553 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4554 extack);
4555 if (err < 0)
4556 return err;
4557
4558 ifm = nlmsg_data(nlh);
4559 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4560 if (!pfx)
4561 return -EINVAL;
4562
4563 if (tb[IFA_CACHEINFO]) {
4564 struct ifa_cacheinfo *ci;
4565
4566 ci = nla_data(tb[IFA_CACHEINFO]);
4567 valid_lft = ci->ifa_valid;
4568 preferred_lft = ci->ifa_prefered;
4569 } else {
4570 preferred_lft = INFINITY_LIFE_TIME;
4571 valid_lft = INFINITY_LIFE_TIME;
4572 }
4573
4574 dev = __dev_get_by_index(net, ifm->ifa_index);
4575 if (!dev)
4576 return -ENODEV;
4577
4578 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4579
4580 /* We ignore other flags so far. */
4581 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4582 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4583
4584 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4585 if (!ifa) {
4586 /*
4587 * It would be best to check for !NLM_F_CREATE here but
4588 * userspace already relies on not having to provide this.
4589 */
4590 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4591 ifm->ifa_prefixlen, ifa_flags,
4592 preferred_lft, valid_lft);
4593 }
4594
4595 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4596 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4597 err = -EEXIST;
4598 else
4599 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4600
4601 in6_ifa_put(ifa);
4602
4603 return err;
4604 }
4605
4606 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4607 u8 scope, int ifindex)
4608 {
4609 struct ifaddrmsg *ifm;
4610
4611 ifm = nlmsg_data(nlh);
4612 ifm->ifa_family = AF_INET6;
4613 ifm->ifa_prefixlen = prefixlen;
4614 ifm->ifa_flags = flags;
4615 ifm->ifa_scope = scope;
4616 ifm->ifa_index = ifindex;
4617 }
4618
4619 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4620 unsigned long tstamp, u32 preferred, u32 valid)
4621 {
4622 struct ifa_cacheinfo ci;
4623
4624 ci.cstamp = cstamp_delta(cstamp);
4625 ci.tstamp = cstamp_delta(tstamp);
4626 ci.ifa_prefered = preferred;
4627 ci.ifa_valid = valid;
4628
4629 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4630 }
4631
4632 static inline int rt_scope(int ifa_scope)
4633 {
4634 if (ifa_scope & IFA_HOST)
4635 return RT_SCOPE_HOST;
4636 else if (ifa_scope & IFA_LINK)
4637 return RT_SCOPE_LINK;
4638 else if (ifa_scope & IFA_SITE)
4639 return RT_SCOPE_SITE;
4640 else
4641 return RT_SCOPE_UNIVERSE;
4642 }
4643
4644 static inline int inet6_ifaddr_msgsize(void)
4645 {
4646 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4647 + nla_total_size(16) /* IFA_LOCAL */
4648 + nla_total_size(16) /* IFA_ADDRESS */
4649 + nla_total_size(sizeof(struct ifa_cacheinfo))
4650 + nla_total_size(4) /* IFA_FLAGS */;
4651 }
4652
4653 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4654 u32 portid, u32 seq, int event, unsigned int flags)
4655 {
4656 struct nlmsghdr *nlh;
4657 u32 preferred, valid;
4658
4659 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4660 if (!nlh)
4661 return -EMSGSIZE;
4662
4663 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4664 ifa->idev->dev->ifindex);
4665
4666 if (!((ifa->flags&IFA_F_PERMANENT) &&
4667 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4668 preferred = ifa->prefered_lft;
4669 valid = ifa->valid_lft;
4670 if (preferred != INFINITY_LIFE_TIME) {
4671 long tval = (jiffies - ifa->tstamp)/HZ;
4672 if (preferred > tval)
4673 preferred -= tval;
4674 else
4675 preferred = 0;
4676 if (valid != INFINITY_LIFE_TIME) {
4677 if (valid > tval)
4678 valid -= tval;
4679 else
4680 valid = 0;
4681 }
4682 }
4683 } else {
4684 preferred = INFINITY_LIFE_TIME;
4685 valid = INFINITY_LIFE_TIME;
4686 }
4687
4688 if (!ipv6_addr_any(&ifa->peer_addr)) {
4689 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4690 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4691 goto error;
4692 } else
4693 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4694 goto error;
4695
4696 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4697 goto error;
4698
4699 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4700 goto error;
4701
4702 nlmsg_end(skb, nlh);
4703 return 0;
4704
4705 error:
4706 nlmsg_cancel(skb, nlh);
4707 return -EMSGSIZE;
4708 }
4709
4710 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4711 u32 portid, u32 seq, int event, u16 flags)
4712 {
4713 struct nlmsghdr *nlh;
4714 u8 scope = RT_SCOPE_UNIVERSE;
4715 int ifindex = ifmca->idev->dev->ifindex;
4716
4717 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4718 scope = RT_SCOPE_SITE;
4719
4720 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4721 if (!nlh)
4722 return -EMSGSIZE;
4723
4724 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4725 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4726 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4727 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4728 nlmsg_cancel(skb, nlh);
4729 return -EMSGSIZE;
4730 }
4731
4732 nlmsg_end(skb, nlh);
4733 return 0;
4734 }
4735
4736 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4737 u32 portid, u32 seq, int event, unsigned int flags)
4738 {
4739 struct nlmsghdr *nlh;
4740 u8 scope = RT_SCOPE_UNIVERSE;
4741 int ifindex = ifaca->aca_idev->dev->ifindex;
4742
4743 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4744 scope = RT_SCOPE_SITE;
4745
4746 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4747 if (!nlh)
4748 return -EMSGSIZE;
4749
4750 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4751 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4752 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4753 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4754 nlmsg_cancel(skb, nlh);
4755 return -EMSGSIZE;
4756 }
4757
4758 nlmsg_end(skb, nlh);
4759 return 0;
4760 }
4761
4762 enum addr_type_t {
4763 UNICAST_ADDR,
4764 MULTICAST_ADDR,
4765 ANYCAST_ADDR,
4766 };
4767
4768 /* called with rcu_read_lock() */
4769 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4770 struct netlink_callback *cb, enum addr_type_t type,
4771 int s_ip_idx, int *p_ip_idx)
4772 {
4773 struct ifmcaddr6 *ifmca;
4774 struct ifacaddr6 *ifaca;
4775 int err = 1;
4776 int ip_idx = *p_ip_idx;
4777
4778 read_lock_bh(&idev->lock);
4779 switch (type) {
4780 case UNICAST_ADDR: {
4781 struct inet6_ifaddr *ifa;
4782
4783 /* unicast address incl. temp addr */
4784 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4785 if (++ip_idx < s_ip_idx)
4786 continue;
4787 err = inet6_fill_ifaddr(skb, ifa,
4788 NETLINK_CB(cb->skb).portid,
4789 cb->nlh->nlmsg_seq,
4790 RTM_NEWADDR,
4791 NLM_F_MULTI);
4792 if (err < 0)
4793 break;
4794 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4795 }
4796 break;
4797 }
4798 case MULTICAST_ADDR:
4799 /* multicast address */
4800 for (ifmca = idev->mc_list; ifmca;
4801 ifmca = ifmca->next, ip_idx++) {
4802 if (ip_idx < s_ip_idx)
4803 continue;
4804 err = inet6_fill_ifmcaddr(skb, ifmca,
4805 NETLINK_CB(cb->skb).portid,
4806 cb->nlh->nlmsg_seq,
4807 RTM_GETMULTICAST,
4808 NLM_F_MULTI);
4809 if (err < 0)
4810 break;
4811 }
4812 break;
4813 case ANYCAST_ADDR:
4814 /* anycast address */
4815 for (ifaca = idev->ac_list; ifaca;
4816 ifaca = ifaca->aca_next, ip_idx++) {
4817 if (ip_idx < s_ip_idx)
4818 continue;
4819 err = inet6_fill_ifacaddr(skb, ifaca,
4820 NETLINK_CB(cb->skb).portid,
4821 cb->nlh->nlmsg_seq,
4822 RTM_GETANYCAST,
4823 NLM_F_MULTI);
4824 if (err < 0)
4825 break;
4826 }
4827 break;
4828 default:
4829 break;
4830 }
4831 read_unlock_bh(&idev->lock);
4832 *p_ip_idx = ip_idx;
4833 return err;
4834 }
4835
4836 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4837 enum addr_type_t type)
4838 {
4839 struct net *net = sock_net(skb->sk);
4840 int h, s_h;
4841 int idx, ip_idx;
4842 int s_idx, s_ip_idx;
4843 struct net_device *dev;
4844 struct inet6_dev *idev;
4845 struct hlist_head *head;
4846
4847 s_h = cb->args[0];
4848 s_idx = idx = cb->args[1];
4849 s_ip_idx = ip_idx = cb->args[2];
4850
4851 rcu_read_lock();
4852 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4853 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4854 idx = 0;
4855 head = &net->dev_index_head[h];
4856 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4857 if (idx < s_idx)
4858 goto cont;
4859 if (h > s_h || idx > s_idx)
4860 s_ip_idx = 0;
4861 ip_idx = 0;
4862 idev = __in6_dev_get(dev);
4863 if (!idev)
4864 goto cont;
4865
4866 if (in6_dump_addrs(idev, skb, cb, type,
4867 s_ip_idx, &ip_idx) < 0)
4868 goto done;
4869 cont:
4870 idx++;
4871 }
4872 }
4873 done:
4874 rcu_read_unlock();
4875 cb->args[0] = h;
4876 cb->args[1] = idx;
4877 cb->args[2] = ip_idx;
4878
4879 return skb->len;
4880 }
4881
4882 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4883 {
4884 enum addr_type_t type = UNICAST_ADDR;
4885
4886 return inet6_dump_addr(skb, cb, type);
4887 }
4888
4889 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4890 {
4891 enum addr_type_t type = MULTICAST_ADDR;
4892
4893 return inet6_dump_addr(skb, cb, type);
4894 }
4895
4896
4897 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4898 {
4899 enum addr_type_t type = ANYCAST_ADDR;
4900
4901 return inet6_dump_addr(skb, cb, type);
4902 }
4903
4904 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4905 struct netlink_ext_ack *extack)
4906 {
4907 struct net *net = sock_net(in_skb->sk);
4908 struct ifaddrmsg *ifm;
4909 struct nlattr *tb[IFA_MAX+1];
4910 struct in6_addr *addr = NULL, *peer;
4911 struct net_device *dev = NULL;
4912 struct inet6_ifaddr *ifa;
4913 struct sk_buff *skb;
4914 int err;
4915
4916 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4917 extack);
4918 if (err < 0)
4919 goto errout;
4920
4921 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4922 if (!addr) {
4923 err = -EINVAL;
4924 goto errout;
4925 }
4926
4927 ifm = nlmsg_data(nlh);
4928 if (ifm->ifa_index)
4929 dev = __dev_get_by_index(net, ifm->ifa_index);
4930
4931 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4932 if (!ifa) {
4933 err = -EADDRNOTAVAIL;
4934 goto errout;
4935 }
4936
4937 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4938 if (!skb) {
4939 err = -ENOBUFS;
4940 goto errout_ifa;
4941 }
4942
4943 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4944 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4945 if (err < 0) {
4946 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4947 WARN_ON(err == -EMSGSIZE);
4948 kfree_skb(skb);
4949 goto errout_ifa;
4950 }
4951 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4952 errout_ifa:
4953 in6_ifa_put(ifa);
4954 errout:
4955 return err;
4956 }
4957
4958 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4959 {
4960 struct sk_buff *skb;
4961 struct net *net = dev_net(ifa->idev->dev);
4962 int err = -ENOBUFS;
4963
4964 /* Don't send DELADDR notification for TENTATIVE address,
4965 * since NEWADDR notification is sent only after removing
4966 * TENTATIVE flag.
4967 */
4968 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4969 return;
4970
4971 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4972 if (!skb)
4973 goto errout;
4974
4975 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4976 if (err < 0) {
4977 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4978 WARN_ON(err == -EMSGSIZE);
4979 kfree_skb(skb);
4980 goto errout;
4981 }
4982 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4983 return;
4984 errout:
4985 if (err < 0)
4986 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4987 }
4988
4989 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4990 __s32 *array, int bytes)
4991 {
4992 BUG_ON(bytes < (DEVCONF_MAX * 4));
4993
4994 memset(array, 0, bytes);
4995 array[DEVCONF_FORWARDING] = cnf->forwarding;
4996 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4997 array[DEVCONF_MTU6] = cnf->mtu6;
4998 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4999 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5000 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5001 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5002 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5003 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5004 jiffies_to_msecs(cnf->rtr_solicit_interval);
5005 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5006 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5007 array[DEVCONF_RTR_SOLICIT_DELAY] =
5008 jiffies_to_msecs(cnf->rtr_solicit_delay);
5009 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5010 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5011 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5012 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5013 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5014 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5015 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5016 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5017 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5018 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5019 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5020 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5021 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5022 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5023 #ifdef CONFIG_IPV6_ROUTER_PREF
5024 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5025 array[DEVCONF_RTR_PROBE_INTERVAL] =
5026 jiffies_to_msecs(cnf->rtr_probe_interval);
5027 #ifdef CONFIG_IPV6_ROUTE_INFO
5028 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5029 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5030 #endif
5031 #endif
5032 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5033 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5034 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5035 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5036 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5037 #endif
5038 #ifdef CONFIG_IPV6_MROUTE
5039 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5040 #endif
5041 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5042 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5043 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5044 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5045 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5046 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5047 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5048 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5049 /* we omit DEVCONF_STABLE_SECRET for now */
5050 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5051 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5052 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5053 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5054 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5055 #ifdef CONFIG_IPV6_SEG6_HMAC
5056 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5057 #endif
5058 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5059 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5060 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5061 }
5062
5063 static inline size_t inet6_ifla6_size(void)
5064 {
5065 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5066 + nla_total_size(sizeof(struct ifla_cacheinfo))
5067 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5068 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5069 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5070 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5071 }
5072
5073 static inline size_t inet6_if_nlmsg_size(void)
5074 {
5075 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5076 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5077 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5078 + nla_total_size(4) /* IFLA_MTU */
5079 + nla_total_size(4) /* IFLA_LINK */
5080 + nla_total_size(1) /* IFLA_OPERSTATE */
5081 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5082 }
5083
5084 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5085 int bytes)
5086 {
5087 int i;
5088 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5089 BUG_ON(pad < 0);
5090
5091 /* Use put_unaligned() because stats may not be aligned for u64. */
5092 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5093 for (i = 1; i < ICMP6_MIB_MAX; i++)
5094 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5095
5096 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5097 }
5098
5099 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5100 int bytes, size_t syncpoff)
5101 {
5102 int i, c;
5103 u64 buff[IPSTATS_MIB_MAX];
5104 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5105
5106 BUG_ON(pad < 0);
5107
5108 memset(buff, 0, sizeof(buff));
5109 buff[0] = IPSTATS_MIB_MAX;
5110
5111 for_each_possible_cpu(c) {
5112 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5113 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5114 }
5115
5116 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5117 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5118 }
5119
5120 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5121 int bytes)
5122 {
5123 switch (attrtype) {
5124 case IFLA_INET6_STATS:
5125 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5126 offsetof(struct ipstats_mib, syncp));
5127 break;
5128 case IFLA_INET6_ICMP6STATS:
5129 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5130 break;
5131 }
5132 }
5133
5134 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5135 u32 ext_filter_mask)
5136 {
5137 struct nlattr *nla;
5138 struct ifla_cacheinfo ci;
5139
5140 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5141 goto nla_put_failure;
5142 ci.max_reasm_len = IPV6_MAXPLEN;
5143 ci.tstamp = cstamp_delta(idev->tstamp);
5144 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5145 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5146 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5147 goto nla_put_failure;
5148 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5149 if (!nla)
5150 goto nla_put_failure;
5151 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5152
5153 /* XXX - MC not implemented */
5154
5155 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5156 return 0;
5157
5158 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5159 if (!nla)
5160 goto nla_put_failure;
5161 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5162
5163 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5164 if (!nla)
5165 goto nla_put_failure;
5166 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5167
5168 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5169 if (!nla)
5170 goto nla_put_failure;
5171
5172 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5173 goto nla_put_failure;
5174
5175 read_lock_bh(&idev->lock);
5176 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5177 read_unlock_bh(&idev->lock);
5178
5179 return 0;
5180
5181 nla_put_failure:
5182 return -EMSGSIZE;
5183 }
5184
5185 static size_t inet6_get_link_af_size(const struct net_device *dev,
5186 u32 ext_filter_mask)
5187 {
5188 if (!__in6_dev_get(dev))
5189 return 0;
5190
5191 return inet6_ifla6_size();
5192 }
5193
5194 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5195 u32 ext_filter_mask)
5196 {
5197 struct inet6_dev *idev = __in6_dev_get(dev);
5198
5199 if (!idev)
5200 return -ENODATA;
5201
5202 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5203 return -EMSGSIZE;
5204
5205 return 0;
5206 }
5207
5208 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5209 {
5210 struct inet6_ifaddr *ifp;
5211 struct net_device *dev = idev->dev;
5212 bool clear_token, update_rs = false;
5213 struct in6_addr ll_addr;
5214
5215 ASSERT_RTNL();
5216
5217 if (!token)
5218 return -EINVAL;
5219 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5220 return -EINVAL;
5221 if (!ipv6_accept_ra(idev))
5222 return -EINVAL;
5223 if (idev->cnf.rtr_solicits == 0)
5224 return -EINVAL;
5225
5226 write_lock_bh(&idev->lock);
5227
5228 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5229 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5230
5231 write_unlock_bh(&idev->lock);
5232
5233 clear_token = ipv6_addr_any(token);
5234 if (clear_token)
5235 goto update_lft;
5236
5237 if (!idev->dead && (idev->if_flags & IF_READY) &&
5238 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5239 IFA_F_OPTIMISTIC)) {
5240 /* If we're not ready, then normal ifup will take care
5241 * of this. Otherwise, we need to request our rs here.
5242 */
5243 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5244 update_rs = true;
5245 }
5246
5247 update_lft:
5248 write_lock_bh(&idev->lock);
5249
5250 if (update_rs) {
5251 idev->if_flags |= IF_RS_SENT;
5252 idev->rs_interval = rfc3315_s14_backoff_init(
5253 idev->cnf.rtr_solicit_interval);
5254 idev->rs_probes = 1;
5255 addrconf_mod_rs_timer(idev, idev->rs_interval);
5256 }
5257
5258 /* Well, that's kinda nasty ... */
5259 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5260 spin_lock(&ifp->lock);
5261 if (ifp->tokenized) {
5262 ifp->valid_lft = 0;
5263 ifp->prefered_lft = 0;
5264 }
5265 spin_unlock(&ifp->lock);
5266 }
5267
5268 write_unlock_bh(&idev->lock);
5269 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5270 addrconf_verify_rtnl();
5271 return 0;
5272 }
5273
5274 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5275 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5276 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5277 };
5278
5279 static int inet6_validate_link_af(const struct net_device *dev,
5280 const struct nlattr *nla)
5281 {
5282 struct nlattr *tb[IFLA_INET6_MAX + 1];
5283
5284 if (dev && !__in6_dev_get(dev))
5285 return -EAFNOSUPPORT;
5286
5287 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5288 NULL);
5289 }
5290
5291 static int check_addr_gen_mode(int mode)
5292 {
5293 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5294 mode != IN6_ADDR_GEN_MODE_NONE &&
5295 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5296 mode != IN6_ADDR_GEN_MODE_RANDOM)
5297 return -EINVAL;
5298 return 1;
5299 }
5300
5301 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5302 int mode)
5303 {
5304 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5305 !idev->cnf.stable_secret.initialized &&
5306 !net->ipv6.devconf_dflt->stable_secret.initialized)
5307 return -EINVAL;
5308 return 1;
5309 }
5310
5311 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5312 {
5313 int err = -EINVAL;
5314 struct inet6_dev *idev = __in6_dev_get(dev);
5315 struct nlattr *tb[IFLA_INET6_MAX + 1];
5316
5317 if (!idev)
5318 return -EAFNOSUPPORT;
5319
5320 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5321 BUG();
5322
5323 if (tb[IFLA_INET6_TOKEN]) {
5324 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5325 if (err)
5326 return err;
5327 }
5328
5329 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5330 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5331
5332 if (check_addr_gen_mode(mode) < 0 ||
5333 check_stable_privacy(idev, dev_net(dev), mode) < 0)
5334 return -EINVAL;
5335
5336 idev->cnf.addr_gen_mode = mode;
5337 err = 0;
5338 }
5339
5340 return err;
5341 }
5342
5343 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5344 u32 portid, u32 seq, int event, unsigned int flags)
5345 {
5346 struct net_device *dev = idev->dev;
5347 struct ifinfomsg *hdr;
5348 struct nlmsghdr *nlh;
5349 void *protoinfo;
5350
5351 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5352 if (!nlh)
5353 return -EMSGSIZE;
5354
5355 hdr = nlmsg_data(nlh);
5356 hdr->ifi_family = AF_INET6;
5357 hdr->__ifi_pad = 0;
5358 hdr->ifi_type = dev->type;
5359 hdr->ifi_index = dev->ifindex;
5360 hdr->ifi_flags = dev_get_flags(dev);
5361 hdr->ifi_change = 0;
5362
5363 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5364 (dev->addr_len &&
5365 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5366 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5367 (dev->ifindex != dev_get_iflink(dev) &&
5368 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5369 nla_put_u8(skb, IFLA_OPERSTATE,
5370 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5371 goto nla_put_failure;
5372 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5373 if (!protoinfo)
5374 goto nla_put_failure;
5375
5376 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5377 goto nla_put_failure;
5378
5379 nla_nest_end(skb, protoinfo);
5380 nlmsg_end(skb, nlh);
5381 return 0;
5382
5383 nla_put_failure:
5384 nlmsg_cancel(skb, nlh);
5385 return -EMSGSIZE;
5386 }
5387
5388 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5389 {
5390 struct net *net = sock_net(skb->sk);
5391 int h, s_h;
5392 int idx = 0, s_idx;
5393 struct net_device *dev;
5394 struct inet6_dev *idev;
5395 struct hlist_head *head;
5396
5397 s_h = cb->args[0];
5398 s_idx = cb->args[1];
5399
5400 rcu_read_lock();
5401 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5402 idx = 0;
5403 head = &net->dev_index_head[h];
5404 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5405 if (idx < s_idx)
5406 goto cont;
5407 idev = __in6_dev_get(dev);
5408 if (!idev)
5409 goto cont;
5410 if (inet6_fill_ifinfo(skb, idev,
5411 NETLINK_CB(cb->skb).portid,
5412 cb->nlh->nlmsg_seq,
5413 RTM_NEWLINK, NLM_F_MULTI) < 0)
5414 goto out;
5415 cont:
5416 idx++;
5417 }
5418 }
5419 out:
5420 rcu_read_unlock();
5421 cb->args[1] = idx;
5422 cb->args[0] = h;
5423
5424 return skb->len;
5425 }
5426
5427 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5428 {
5429 struct sk_buff *skb;
5430 struct net *net = dev_net(idev->dev);
5431 int err = -ENOBUFS;
5432
5433 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5434 if (!skb)
5435 goto errout;
5436
5437 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5438 if (err < 0) {
5439 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5440 WARN_ON(err == -EMSGSIZE);
5441 kfree_skb(skb);
5442 goto errout;
5443 }
5444 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5445 return;
5446 errout:
5447 if (err < 0)
5448 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5449 }
5450
5451 static inline size_t inet6_prefix_nlmsg_size(void)
5452 {
5453 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5454 + nla_total_size(sizeof(struct in6_addr))
5455 + nla_total_size(sizeof(struct prefix_cacheinfo));
5456 }
5457
5458 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5459 struct prefix_info *pinfo, u32 portid, u32 seq,
5460 int event, unsigned int flags)
5461 {
5462 struct prefixmsg *pmsg;
5463 struct nlmsghdr *nlh;
5464 struct prefix_cacheinfo ci;
5465
5466 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5467 if (!nlh)
5468 return -EMSGSIZE;
5469
5470 pmsg = nlmsg_data(nlh);
5471 pmsg->prefix_family = AF_INET6;
5472 pmsg->prefix_pad1 = 0;
5473 pmsg->prefix_pad2 = 0;
5474 pmsg->prefix_ifindex = idev->dev->ifindex;
5475 pmsg->prefix_len = pinfo->prefix_len;
5476 pmsg->prefix_type = pinfo->type;
5477 pmsg->prefix_pad3 = 0;
5478 pmsg->prefix_flags = 0;
5479 if (pinfo->onlink)
5480 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5481 if (pinfo->autoconf)
5482 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5483
5484 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5485 goto nla_put_failure;
5486 ci.preferred_time = ntohl(pinfo->prefered);
5487 ci.valid_time = ntohl(pinfo->valid);
5488 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5489 goto nla_put_failure;
5490 nlmsg_end(skb, nlh);
5491 return 0;
5492
5493 nla_put_failure:
5494 nlmsg_cancel(skb, nlh);
5495 return -EMSGSIZE;
5496 }
5497
5498 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5499 struct prefix_info *pinfo)
5500 {
5501 struct sk_buff *skb;
5502 struct net *net = dev_net(idev->dev);
5503 int err = -ENOBUFS;
5504
5505 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5506 if (!skb)
5507 goto errout;
5508
5509 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5510 if (err < 0) {
5511 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5512 WARN_ON(err == -EMSGSIZE);
5513 kfree_skb(skb);
5514 goto errout;
5515 }
5516 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5517 return;
5518 errout:
5519 if (err < 0)
5520 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5521 }
5522
5523 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5524 {
5525 struct net *net = dev_net(ifp->idev->dev);
5526
5527 if (event)
5528 ASSERT_RTNL();
5529
5530 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5531
5532 switch (event) {
5533 case RTM_NEWADDR:
5534 /*
5535 * If the address was optimistic
5536 * we inserted the route at the start of
5537 * our DAD process, so we don't need
5538 * to do it again
5539 */
5540 if (!(ifp->rt->rt6i_node))
5541 ip6_ins_rt(ifp->rt);
5542 if (ifp->idev->cnf.forwarding)
5543 addrconf_join_anycast(ifp);
5544 if (!ipv6_addr_any(&ifp->peer_addr))
5545 addrconf_prefix_route(&ifp->peer_addr, 128,
5546 ifp->idev->dev, 0, 0);
5547 break;
5548 case RTM_DELADDR:
5549 if (ifp->idev->cnf.forwarding)
5550 addrconf_leave_anycast(ifp);
5551 addrconf_leave_solict(ifp->idev, &ifp->addr);
5552 if (!ipv6_addr_any(&ifp->peer_addr)) {
5553 struct rt6_info *rt;
5554
5555 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5556 ifp->idev->dev, 0, 0);
5557 if (rt)
5558 ip6_del_rt(rt);
5559 }
5560 if (ifp->rt) {
5561 dst_hold(&ifp->rt->dst);
5562 ip6_del_rt(ifp->rt);
5563 }
5564 rt_genid_bump_ipv6(net);
5565 break;
5566 }
5567 atomic_inc(&net->ipv6.dev_addr_genid);
5568 }
5569
5570 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5571 {
5572 rcu_read_lock_bh();
5573 if (likely(ifp->idev->dead == 0))
5574 __ipv6_ifa_notify(event, ifp);
5575 rcu_read_unlock_bh();
5576 }
5577
5578 #ifdef CONFIG_SYSCTL
5579
5580 static
5581 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5582 void __user *buffer, size_t *lenp, loff_t *ppos)
5583 {
5584 int *valp = ctl->data;
5585 int val = *valp;
5586 loff_t pos = *ppos;
5587 struct ctl_table lctl;
5588 int ret;
5589
5590 /*
5591 * ctl->data points to idev->cnf.forwarding, we should
5592 * not modify it until we get the rtnl lock.
5593 */
5594 lctl = *ctl;
5595 lctl.data = &val;
5596
5597 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5598
5599 if (write)
5600 ret = addrconf_fixup_forwarding(ctl, valp, val);
5601 if (ret)
5602 *ppos = pos;
5603 return ret;
5604 }
5605
5606 static
5607 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5608 void __user *buffer, size_t *lenp, loff_t *ppos)
5609 {
5610 struct inet6_dev *idev = ctl->extra1;
5611 int min_mtu = IPV6_MIN_MTU;
5612 struct ctl_table lctl;
5613
5614 lctl = *ctl;
5615 lctl.extra1 = &min_mtu;
5616 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5617
5618 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5619 }
5620
5621 static void dev_disable_change(struct inet6_dev *idev)
5622 {
5623 struct netdev_notifier_info info;
5624
5625 if (!idev || !idev->dev)
5626 return;
5627
5628 netdev_notifier_info_init(&info, idev->dev);
5629 if (idev->cnf.disable_ipv6)
5630 addrconf_notify(NULL, NETDEV_DOWN, &info);
5631 else
5632 addrconf_notify(NULL, NETDEV_UP, &info);
5633 }
5634
5635 static void addrconf_disable_change(struct net *net, __s32 newf)
5636 {
5637 struct net_device *dev;
5638 struct inet6_dev *idev;
5639
5640 for_each_netdev(net, dev) {
5641 idev = __in6_dev_get(dev);
5642 if (idev) {
5643 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5644 idev->cnf.disable_ipv6 = newf;
5645 if (changed)
5646 dev_disable_change(idev);
5647 }
5648 }
5649 }
5650
5651 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5652 {
5653 struct net *net;
5654 int old;
5655
5656 if (!rtnl_trylock())
5657 return restart_syscall();
5658
5659 net = (struct net *)table->extra2;
5660 old = *p;
5661 *p = newf;
5662
5663 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5664 rtnl_unlock();
5665 return 0;
5666 }
5667
5668 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5669 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5670 addrconf_disable_change(net, newf);
5671 } else if ((!newf) ^ (!old))
5672 dev_disable_change((struct inet6_dev *)table->extra1);
5673
5674 rtnl_unlock();
5675 return 0;
5676 }
5677
5678 static
5679 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5680 void __user *buffer, size_t *lenp, loff_t *ppos)
5681 {
5682 int *valp = ctl->data;
5683 int val = *valp;
5684 loff_t pos = *ppos;
5685 struct ctl_table lctl;
5686 int ret;
5687
5688 /*
5689 * ctl->data points to idev->cnf.disable_ipv6, we should
5690 * not modify it until we get the rtnl lock.
5691 */
5692 lctl = *ctl;
5693 lctl.data = &val;
5694
5695 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5696
5697 if (write)
5698 ret = addrconf_disable_ipv6(ctl, valp, val);
5699 if (ret)
5700 *ppos = pos;
5701 return ret;
5702 }
5703
5704 static
5705 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5706 void __user *buffer, size_t *lenp, loff_t *ppos)
5707 {
5708 int *valp = ctl->data;
5709 int ret;
5710 int old, new;
5711
5712 old = *valp;
5713 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5714 new = *valp;
5715
5716 if (write && old != new) {
5717 struct net *net = ctl->extra2;
5718
5719 if (!rtnl_trylock())
5720 return restart_syscall();
5721
5722 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5723 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5724 NETCONFA_PROXY_NEIGH,
5725 NETCONFA_IFINDEX_DEFAULT,
5726 net->ipv6.devconf_dflt);
5727 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5728 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5729 NETCONFA_PROXY_NEIGH,
5730 NETCONFA_IFINDEX_ALL,
5731 net->ipv6.devconf_all);
5732 else {
5733 struct inet6_dev *idev = ctl->extra1;
5734
5735 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5736 NETCONFA_PROXY_NEIGH,
5737 idev->dev->ifindex,
5738 &idev->cnf);
5739 }
5740 rtnl_unlock();
5741 }
5742
5743 return ret;
5744 }
5745
5746 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5747 void __user *buffer, size_t *lenp,
5748 loff_t *ppos)
5749 {
5750 int ret = 0;
5751 int new_val;
5752 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5753 struct net *net = (struct net *)ctl->extra2;
5754
5755 if (!rtnl_trylock())
5756 return restart_syscall();
5757
5758 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5759
5760 if (write) {
5761 new_val = *((int *)ctl->data);
5762
5763 if (check_addr_gen_mode(new_val) < 0) {
5764 ret = -EINVAL;
5765 goto out;
5766 }
5767
5768 /* request for default */
5769 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5770 ipv6_devconf_dflt.addr_gen_mode = new_val;
5771
5772 /* request for individual net device */
5773 } else {
5774 if (!idev)
5775 goto out;
5776
5777 if (check_stable_privacy(idev, net, new_val) < 0) {
5778 ret = -EINVAL;
5779 goto out;
5780 }
5781
5782 if (idev->cnf.addr_gen_mode != new_val) {
5783 idev->cnf.addr_gen_mode = new_val;
5784 addrconf_dev_config(idev->dev);
5785 }
5786 }
5787 }
5788
5789 out:
5790 rtnl_unlock();
5791
5792 return ret;
5793 }
5794
5795 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5796 void __user *buffer, size_t *lenp,
5797 loff_t *ppos)
5798 {
5799 int err;
5800 struct in6_addr addr;
5801 char str[IPV6_MAX_STRLEN];
5802 struct ctl_table lctl = *ctl;
5803 struct net *net = ctl->extra2;
5804 struct ipv6_stable_secret *secret = ctl->data;
5805
5806 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5807 return -EIO;
5808
5809 lctl.maxlen = IPV6_MAX_STRLEN;
5810 lctl.data = str;
5811
5812 if (!rtnl_trylock())
5813 return restart_syscall();
5814
5815 if (!write && !secret->initialized) {
5816 err = -EIO;
5817 goto out;
5818 }
5819
5820 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5821 if (err >= sizeof(str)) {
5822 err = -EIO;
5823 goto out;
5824 }
5825
5826 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5827 if (err || !write)
5828 goto out;
5829
5830 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5831 err = -EIO;
5832 goto out;
5833 }
5834
5835 secret->initialized = true;
5836 secret->secret = addr;
5837
5838 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5839 struct net_device *dev;
5840
5841 for_each_netdev(net, dev) {
5842 struct inet6_dev *idev = __in6_dev_get(dev);
5843
5844 if (idev) {
5845 idev->cnf.addr_gen_mode =
5846 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5847 }
5848 }
5849 } else {
5850 struct inet6_dev *idev = ctl->extra1;
5851
5852 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5853 }
5854
5855 out:
5856 rtnl_unlock();
5857
5858 return err;
5859 }
5860
5861 static
5862 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5863 int write,
5864 void __user *buffer,
5865 size_t *lenp,
5866 loff_t *ppos)
5867 {
5868 int *valp = ctl->data;
5869 int val = *valp;
5870 loff_t pos = *ppos;
5871 struct ctl_table lctl;
5872 int ret;
5873
5874 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5875 * we should not modify it until we get the rtnl lock.
5876 */
5877 lctl = *ctl;
5878 lctl.data = &val;
5879
5880 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5881
5882 if (write)
5883 ret = addrconf_fixup_linkdown(ctl, valp, val);
5884 if (ret)
5885 *ppos = pos;
5886 return ret;
5887 }
5888
5889 static
5890 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5891 {
5892 if (rt) {
5893 if (action)
5894 rt->dst.flags |= DST_NOPOLICY;
5895 else
5896 rt->dst.flags &= ~DST_NOPOLICY;
5897 }
5898 }
5899
5900 static
5901 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5902 {
5903 struct inet6_ifaddr *ifa;
5904
5905 read_lock_bh(&idev->lock);
5906 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5907 spin_lock(&ifa->lock);
5908 if (ifa->rt) {
5909 struct rt6_info *rt = ifa->rt;
5910 struct fib6_table *table = rt->rt6i_table;
5911 int cpu;
5912
5913 read_lock(&table->tb6_lock);
5914 addrconf_set_nopolicy(ifa->rt, val);
5915 if (rt->rt6i_pcpu) {
5916 for_each_possible_cpu(cpu) {
5917 struct rt6_info **rtp;
5918
5919 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5920 addrconf_set_nopolicy(*rtp, val);
5921 }
5922 }
5923 read_unlock(&table->tb6_lock);
5924 }
5925 spin_unlock(&ifa->lock);
5926 }
5927 read_unlock_bh(&idev->lock);
5928 }
5929
5930 static
5931 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5932 {
5933 struct inet6_dev *idev;
5934 struct net *net;
5935
5936 if (!rtnl_trylock())
5937 return restart_syscall();
5938
5939 *valp = val;
5940
5941 net = (struct net *)ctl->extra2;
5942 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5943 rtnl_unlock();
5944 return 0;
5945 }
5946
5947 if (valp == &net->ipv6.devconf_all->disable_policy) {
5948 struct net_device *dev;
5949
5950 for_each_netdev(net, dev) {
5951 idev = __in6_dev_get(dev);
5952 if (idev)
5953 addrconf_disable_policy_idev(idev, val);
5954 }
5955 } else {
5956 idev = (struct inet6_dev *)ctl->extra1;
5957 addrconf_disable_policy_idev(idev, val);
5958 }
5959
5960 rtnl_unlock();
5961 return 0;
5962 }
5963
5964 static
5965 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5966 void __user *buffer, size_t *lenp,
5967 loff_t *ppos)
5968 {
5969 int *valp = ctl->data;
5970 int val = *valp;
5971 loff_t pos = *ppos;
5972 struct ctl_table lctl;
5973 int ret;
5974
5975 lctl = *ctl;
5976 lctl.data = &val;
5977 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5978
5979 if (write && (*valp != val))
5980 ret = addrconf_disable_policy(ctl, valp, val);
5981
5982 if (ret)
5983 *ppos = pos;
5984
5985 return ret;
5986 }
5987
5988 static int minus_one = -1;
5989 static const int one = 1;
5990 static const int two_five_five = 255;
5991
5992 static const struct ctl_table addrconf_sysctl[] = {
5993 {
5994 .procname = "forwarding",
5995 .data = &ipv6_devconf.forwarding,
5996 .maxlen = sizeof(int),
5997 .mode = 0644,
5998 .proc_handler = addrconf_sysctl_forward,
5999 },
6000 {
6001 .procname = "hop_limit",
6002 .data = &ipv6_devconf.hop_limit,
6003 .maxlen = sizeof(int),
6004 .mode = 0644,
6005 .proc_handler = proc_dointvec_minmax,
6006 .extra1 = (void *)&one,
6007 .extra2 = (void *)&two_five_five,
6008 },
6009 {
6010 .procname = "mtu",
6011 .data = &ipv6_devconf.mtu6,
6012 .maxlen = sizeof(int),
6013 .mode = 0644,
6014 .proc_handler = addrconf_sysctl_mtu,
6015 },
6016 {
6017 .procname = "accept_ra",
6018 .data = &ipv6_devconf.accept_ra,
6019 .maxlen = sizeof(int),
6020 .mode = 0644,
6021 .proc_handler = proc_dointvec,
6022 },
6023 {
6024 .procname = "accept_redirects",
6025 .data = &ipv6_devconf.accept_redirects,
6026 .maxlen = sizeof(int),
6027 .mode = 0644,
6028 .proc_handler = proc_dointvec,
6029 },
6030 {
6031 .procname = "autoconf",
6032 .data = &ipv6_devconf.autoconf,
6033 .maxlen = sizeof(int),
6034 .mode = 0644,
6035 .proc_handler = proc_dointvec,
6036 },
6037 {
6038 .procname = "dad_transmits",
6039 .data = &ipv6_devconf.dad_transmits,
6040 .maxlen = sizeof(int),
6041 .mode = 0644,
6042 .proc_handler = proc_dointvec,
6043 },
6044 {
6045 .procname = "router_solicitations",
6046 .data = &ipv6_devconf.rtr_solicits,
6047 .maxlen = sizeof(int),
6048 .mode = 0644,
6049 .proc_handler = proc_dointvec_minmax,
6050 .extra1 = &minus_one,
6051 },
6052 {
6053 .procname = "router_solicitation_interval",
6054 .data = &ipv6_devconf.rtr_solicit_interval,
6055 .maxlen = sizeof(int),
6056 .mode = 0644,
6057 .proc_handler = proc_dointvec_jiffies,
6058 },
6059 {
6060 .procname = "router_solicitation_max_interval",
6061 .data = &ipv6_devconf.rtr_solicit_max_interval,
6062 .maxlen = sizeof(int),
6063 .mode = 0644,
6064 .proc_handler = proc_dointvec_jiffies,
6065 },
6066 {
6067 .procname = "router_solicitation_delay",
6068 .data = &ipv6_devconf.rtr_solicit_delay,
6069 .maxlen = sizeof(int),
6070 .mode = 0644,
6071 .proc_handler = proc_dointvec_jiffies,
6072 },
6073 {
6074 .procname = "force_mld_version",
6075 .data = &ipv6_devconf.force_mld_version,
6076 .maxlen = sizeof(int),
6077 .mode = 0644,
6078 .proc_handler = proc_dointvec,
6079 },
6080 {
6081 .procname = "mldv1_unsolicited_report_interval",
6082 .data =
6083 &ipv6_devconf.mldv1_unsolicited_report_interval,
6084 .maxlen = sizeof(int),
6085 .mode = 0644,
6086 .proc_handler = proc_dointvec_ms_jiffies,
6087 },
6088 {
6089 .procname = "mldv2_unsolicited_report_interval",
6090 .data =
6091 &ipv6_devconf.mldv2_unsolicited_report_interval,
6092 .maxlen = sizeof(int),
6093 .mode = 0644,
6094 .proc_handler = proc_dointvec_ms_jiffies,
6095 },
6096 {
6097 .procname = "use_tempaddr",
6098 .data = &ipv6_devconf.use_tempaddr,
6099 .maxlen = sizeof(int),
6100 .mode = 0644,
6101 .proc_handler = proc_dointvec,
6102 },
6103 {
6104 .procname = "temp_valid_lft",
6105 .data = &ipv6_devconf.temp_valid_lft,
6106 .maxlen = sizeof(int),
6107 .mode = 0644,
6108 .proc_handler = proc_dointvec,
6109 },
6110 {
6111 .procname = "temp_prefered_lft",
6112 .data = &ipv6_devconf.temp_prefered_lft,
6113 .maxlen = sizeof(int),
6114 .mode = 0644,
6115 .proc_handler = proc_dointvec,
6116 },
6117 {
6118 .procname = "regen_max_retry",
6119 .data = &ipv6_devconf.regen_max_retry,
6120 .maxlen = sizeof(int),
6121 .mode = 0644,
6122 .proc_handler = proc_dointvec,
6123 },
6124 {
6125 .procname = "max_desync_factor",
6126 .data = &ipv6_devconf.max_desync_factor,
6127 .maxlen = sizeof(int),
6128 .mode = 0644,
6129 .proc_handler = proc_dointvec,
6130 },
6131 {
6132 .procname = "max_addresses",
6133 .data = &ipv6_devconf.max_addresses,
6134 .maxlen = sizeof(int),
6135 .mode = 0644,
6136 .proc_handler = proc_dointvec,
6137 },
6138 {
6139 .procname = "accept_ra_defrtr",
6140 .data = &ipv6_devconf.accept_ra_defrtr,
6141 .maxlen = sizeof(int),
6142 .mode = 0644,
6143 .proc_handler = proc_dointvec,
6144 },
6145 {
6146 .procname = "accept_ra_min_hop_limit",
6147 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6148 .maxlen = sizeof(int),
6149 .mode = 0644,
6150 .proc_handler = proc_dointvec,
6151 },
6152 {
6153 .procname = "accept_ra_pinfo",
6154 .data = &ipv6_devconf.accept_ra_pinfo,
6155 .maxlen = sizeof(int),
6156 .mode = 0644,
6157 .proc_handler = proc_dointvec,
6158 },
6159 #ifdef CONFIG_IPV6_ROUTER_PREF
6160 {
6161 .procname = "accept_ra_rtr_pref",
6162 .data = &ipv6_devconf.accept_ra_rtr_pref,
6163 .maxlen = sizeof(int),
6164 .mode = 0644,
6165 .proc_handler = proc_dointvec,
6166 },
6167 {
6168 .procname = "router_probe_interval",
6169 .data = &ipv6_devconf.rtr_probe_interval,
6170 .maxlen = sizeof(int),
6171 .mode = 0644,
6172 .proc_handler = proc_dointvec_jiffies,
6173 },
6174 #ifdef CONFIG_IPV6_ROUTE_INFO
6175 {
6176 .procname = "accept_ra_rt_info_min_plen",
6177 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6178 .maxlen = sizeof(int),
6179 .mode = 0644,
6180 .proc_handler = proc_dointvec,
6181 },
6182 {
6183 .procname = "accept_ra_rt_info_max_plen",
6184 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6185 .maxlen = sizeof(int),
6186 .mode = 0644,
6187 .proc_handler = proc_dointvec,
6188 },
6189 #endif
6190 #endif
6191 {
6192 .procname = "proxy_ndp",
6193 .data = &ipv6_devconf.proxy_ndp,
6194 .maxlen = sizeof(int),
6195 .mode = 0644,
6196 .proc_handler = addrconf_sysctl_proxy_ndp,
6197 },
6198 {
6199 .procname = "accept_source_route",
6200 .data = &ipv6_devconf.accept_source_route,
6201 .maxlen = sizeof(int),
6202 .mode = 0644,
6203 .proc_handler = proc_dointvec,
6204 },
6205 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6206 {
6207 .procname = "optimistic_dad",
6208 .data = &ipv6_devconf.optimistic_dad,
6209 .maxlen = sizeof(int),
6210 .mode = 0644,
6211 .proc_handler = proc_dointvec,
6212 },
6213 {
6214 .procname = "use_optimistic",
6215 .data = &ipv6_devconf.use_optimistic,
6216 .maxlen = sizeof(int),
6217 .mode = 0644,
6218 .proc_handler = proc_dointvec,
6219 },
6220 #endif
6221 #ifdef CONFIG_IPV6_MROUTE
6222 {
6223 .procname = "mc_forwarding",
6224 .data = &ipv6_devconf.mc_forwarding,
6225 .maxlen = sizeof(int),
6226 .mode = 0444,
6227 .proc_handler = proc_dointvec,
6228 },
6229 #endif
6230 {
6231 .procname = "disable_ipv6",
6232 .data = &ipv6_devconf.disable_ipv6,
6233 .maxlen = sizeof(int),
6234 .mode = 0644,
6235 .proc_handler = addrconf_sysctl_disable,
6236 },
6237 {
6238 .procname = "accept_dad",
6239 .data = &ipv6_devconf.accept_dad,
6240 .maxlen = sizeof(int),
6241 .mode = 0644,
6242 .proc_handler = proc_dointvec,
6243 },
6244 {
6245 .procname = "force_tllao",
6246 .data = &ipv6_devconf.force_tllao,
6247 .maxlen = sizeof(int),
6248 .mode = 0644,
6249 .proc_handler = proc_dointvec
6250 },
6251 {
6252 .procname = "ndisc_notify",
6253 .data = &ipv6_devconf.ndisc_notify,
6254 .maxlen = sizeof(int),
6255 .mode = 0644,
6256 .proc_handler = proc_dointvec
6257 },
6258 {
6259 .procname = "suppress_frag_ndisc",
6260 .data = &ipv6_devconf.suppress_frag_ndisc,
6261 .maxlen = sizeof(int),
6262 .mode = 0644,
6263 .proc_handler = proc_dointvec
6264 },
6265 {
6266 .procname = "accept_ra_from_local",
6267 .data = &ipv6_devconf.accept_ra_from_local,
6268 .maxlen = sizeof(int),
6269 .mode = 0644,
6270 .proc_handler = proc_dointvec,
6271 },
6272 {
6273 .procname = "accept_ra_mtu",
6274 .data = &ipv6_devconf.accept_ra_mtu,
6275 .maxlen = sizeof(int),
6276 .mode = 0644,
6277 .proc_handler = proc_dointvec,
6278 },
6279 {
6280 .procname = "stable_secret",
6281 .data = &ipv6_devconf.stable_secret,
6282 .maxlen = IPV6_MAX_STRLEN,
6283 .mode = 0600,
6284 .proc_handler = addrconf_sysctl_stable_secret,
6285 },
6286 {
6287 .procname = "use_oif_addrs_only",
6288 .data = &ipv6_devconf.use_oif_addrs_only,
6289 .maxlen = sizeof(int),
6290 .mode = 0644,
6291 .proc_handler = proc_dointvec,
6292 },
6293 {
6294 .procname = "ignore_routes_with_linkdown",
6295 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6296 .maxlen = sizeof(int),
6297 .mode = 0644,
6298 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6299 },
6300 {
6301 .procname = "drop_unicast_in_l2_multicast",
6302 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6303 .maxlen = sizeof(int),
6304 .mode = 0644,
6305 .proc_handler = proc_dointvec,
6306 },
6307 {
6308 .procname = "drop_unsolicited_na",
6309 .data = &ipv6_devconf.drop_unsolicited_na,
6310 .maxlen = sizeof(int),
6311 .mode = 0644,
6312 .proc_handler = proc_dointvec,
6313 },
6314 {
6315 .procname = "keep_addr_on_down",
6316 .data = &ipv6_devconf.keep_addr_on_down,
6317 .maxlen = sizeof(int),
6318 .mode = 0644,
6319 .proc_handler = proc_dointvec,
6320
6321 },
6322 {
6323 .procname = "seg6_enabled",
6324 .data = &ipv6_devconf.seg6_enabled,
6325 .maxlen = sizeof(int),
6326 .mode = 0644,
6327 .proc_handler = proc_dointvec,
6328 },
6329 #ifdef CONFIG_IPV6_SEG6_HMAC
6330 {
6331 .procname = "seg6_require_hmac",
6332 .data = &ipv6_devconf.seg6_require_hmac,
6333 .maxlen = sizeof(int),
6334 .mode = 0644,
6335 .proc_handler = proc_dointvec,
6336 },
6337 #endif
6338 {
6339 .procname = "enhanced_dad",
6340 .data = &ipv6_devconf.enhanced_dad,
6341 .maxlen = sizeof(int),
6342 .mode = 0644,
6343 .proc_handler = proc_dointvec,
6344 },
6345 {
6346 .procname = "addr_gen_mode",
6347 .data = &ipv6_devconf.addr_gen_mode,
6348 .maxlen = sizeof(int),
6349 .mode = 0644,
6350 .proc_handler = addrconf_sysctl_addr_gen_mode,
6351 },
6352 {
6353 .procname = "disable_policy",
6354 .data = &ipv6_devconf.disable_policy,
6355 .maxlen = sizeof(int),
6356 .mode = 0644,
6357 .proc_handler = addrconf_sysctl_disable_policy,
6358 },
6359 {
6360 /* sentinel */
6361 }
6362 };
6363
6364 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6365 struct inet6_dev *idev, struct ipv6_devconf *p)
6366 {
6367 int i, ifindex;
6368 struct ctl_table *table;
6369 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6370
6371 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6372 if (!table)
6373 goto out;
6374
6375 for (i = 0; table[i].data; i++) {
6376 table[i].data += (char *)p - (char *)&ipv6_devconf;
6377 /* If one of these is already set, then it is not safe to
6378 * overwrite either of them: this makes proc_dointvec_minmax
6379 * usable.
6380 */
6381 if (!table[i].extra1 && !table[i].extra2) {
6382 table[i].extra1 = idev; /* embedded; no ref */
6383 table[i].extra2 = net;
6384 }
6385 }
6386
6387 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6388
6389 p->sysctl_header = register_net_sysctl(net, path, table);
6390 if (!p->sysctl_header)
6391 goto free;
6392
6393 if (!strcmp(dev_name, "all"))
6394 ifindex = NETCONFA_IFINDEX_ALL;
6395 else if (!strcmp(dev_name, "default"))
6396 ifindex = NETCONFA_IFINDEX_DEFAULT;
6397 else
6398 ifindex = idev->dev->ifindex;
6399 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6400 ifindex, p);
6401 return 0;
6402
6403 free:
6404 kfree(table);
6405 out:
6406 return -ENOBUFS;
6407 }
6408
6409 static void __addrconf_sysctl_unregister(struct net *net,
6410 struct ipv6_devconf *p, int ifindex)
6411 {
6412 struct ctl_table *table;
6413
6414 if (!p->sysctl_header)
6415 return;
6416
6417 table = p->sysctl_header->ctl_table_arg;
6418 unregister_net_sysctl_table(p->sysctl_header);
6419 p->sysctl_header = NULL;
6420 kfree(table);
6421
6422 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6423 }
6424
6425 static int addrconf_sysctl_register(struct inet6_dev *idev)
6426 {
6427 int err;
6428
6429 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6430 return -EINVAL;
6431
6432 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6433 &ndisc_ifinfo_sysctl_change);
6434 if (err)
6435 return err;
6436 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6437 idev, &idev->cnf);
6438 if (err)
6439 neigh_sysctl_unregister(idev->nd_parms);
6440
6441 return err;
6442 }
6443
6444 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6445 {
6446 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6447 idev->dev->ifindex);
6448 neigh_sysctl_unregister(idev->nd_parms);
6449 }
6450
6451
6452 #endif
6453
6454 static int __net_init addrconf_init_net(struct net *net)
6455 {
6456 int err = -ENOMEM;
6457 struct ipv6_devconf *all, *dflt;
6458
6459 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6460 if (!all)
6461 goto err_alloc_all;
6462
6463 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6464 if (!dflt)
6465 goto err_alloc_dflt;
6466
6467 /* these will be inherited by all namespaces */
6468 dflt->autoconf = ipv6_defaults.autoconf;
6469 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6470
6471 dflt->stable_secret.initialized = false;
6472 all->stable_secret.initialized = false;
6473
6474 net->ipv6.devconf_all = all;
6475 net->ipv6.devconf_dflt = dflt;
6476
6477 #ifdef CONFIG_SYSCTL
6478 err = __addrconf_sysctl_register(net, "all", NULL, all);
6479 if (err < 0)
6480 goto err_reg_all;
6481
6482 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6483 if (err < 0)
6484 goto err_reg_dflt;
6485 #endif
6486 return 0;
6487
6488 #ifdef CONFIG_SYSCTL
6489 err_reg_dflt:
6490 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6491 err_reg_all:
6492 kfree(dflt);
6493 #endif
6494 err_alloc_dflt:
6495 kfree(all);
6496 err_alloc_all:
6497 return err;
6498 }
6499
6500 static void __net_exit addrconf_exit_net(struct net *net)
6501 {
6502 #ifdef CONFIG_SYSCTL
6503 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6504 NETCONFA_IFINDEX_DEFAULT);
6505 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6506 NETCONFA_IFINDEX_ALL);
6507 #endif
6508 kfree(net->ipv6.devconf_dflt);
6509 kfree(net->ipv6.devconf_all);
6510 }
6511
6512 static struct pernet_operations addrconf_ops = {
6513 .init = addrconf_init_net,
6514 .exit = addrconf_exit_net,
6515 };
6516
6517 static struct rtnl_af_ops inet6_ops __read_mostly = {
6518 .family = AF_INET6,
6519 .fill_link_af = inet6_fill_link_af,
6520 .get_link_af_size = inet6_get_link_af_size,
6521 .validate_link_af = inet6_validate_link_af,
6522 .set_link_af = inet6_set_link_af,
6523 };
6524
6525 /*
6526 * Init / cleanup code
6527 */
6528
6529 int __init addrconf_init(void)
6530 {
6531 struct inet6_dev *idev;
6532 int i, err;
6533
6534 err = ipv6_addr_label_init();
6535 if (err < 0) {
6536 pr_crit("%s: cannot initialize default policy table: %d\n",
6537 __func__, err);
6538 goto out;
6539 }
6540
6541 err = register_pernet_subsys(&addrconf_ops);
6542 if (err < 0)
6543 goto out_addrlabel;
6544
6545 addrconf_wq = create_workqueue("ipv6_addrconf");
6546 if (!addrconf_wq) {
6547 err = -ENOMEM;
6548 goto out_nowq;
6549 }
6550
6551 /* The addrconf netdev notifier requires that loopback_dev
6552 * has it's ipv6 private information allocated and setup
6553 * before it can bring up and give link-local addresses
6554 * to other devices which are up.
6555 *
6556 * Unfortunately, loopback_dev is not necessarily the first
6557 * entry in the global dev_base list of net devices. In fact,
6558 * it is likely to be the very last entry on that list.
6559 * So this causes the notifier registry below to try and
6560 * give link-local addresses to all devices besides loopback_dev
6561 * first, then loopback_dev, which cases all the non-loopback_dev
6562 * devices to fail to get a link-local address.
6563 *
6564 * So, as a temporary fix, allocate the ipv6 structure for
6565 * loopback_dev first by hand.
6566 * Longer term, all of the dependencies ipv6 has upon the loopback
6567 * device and it being up should be removed.
6568 */
6569 rtnl_lock();
6570 idev = ipv6_add_dev(init_net.loopback_dev);
6571 rtnl_unlock();
6572 if (IS_ERR(idev)) {
6573 err = PTR_ERR(idev);
6574 goto errlo;
6575 }
6576
6577 ip6_route_init_special_entries();
6578
6579 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6580 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6581
6582 register_netdevice_notifier(&ipv6_dev_notf);
6583
6584 addrconf_verify();
6585
6586 rtnl_af_register(&inet6_ops);
6587
6588 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6589 NULL);
6590 if (err < 0)
6591 goto errout;
6592
6593 /* Only the first call to __rtnl_register can fail */
6594 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6595 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6596 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6597 inet6_dump_ifaddr, NULL);
6598 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6599 inet6_dump_ifmcaddr, NULL);
6600 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6601 inet6_dump_ifacaddr, NULL);
6602 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6603 inet6_netconf_dump_devconf, NULL);
6604
6605 ipv6_addr_label_rtnl_register();
6606
6607 return 0;
6608 errout:
6609 rtnl_af_unregister(&inet6_ops);
6610 unregister_netdevice_notifier(&ipv6_dev_notf);
6611 errlo:
6612 destroy_workqueue(addrconf_wq);
6613 out_nowq:
6614 unregister_pernet_subsys(&addrconf_ops);
6615 out_addrlabel:
6616 ipv6_addr_label_cleanup();
6617 out:
6618 return err;
6619 }
6620
6621 void addrconf_cleanup(void)
6622 {
6623 struct net_device *dev;
6624 int i;
6625
6626 unregister_netdevice_notifier(&ipv6_dev_notf);
6627 unregister_pernet_subsys(&addrconf_ops);
6628 ipv6_addr_label_cleanup();
6629
6630 rtnl_lock();
6631
6632 __rtnl_af_unregister(&inet6_ops);
6633
6634 /* clean dev list */
6635 for_each_netdev(&init_net, dev) {
6636 if (__in6_dev_get(dev) == NULL)
6637 continue;
6638 addrconf_ifdown(dev, 1);
6639 }
6640 addrconf_ifdown(init_net.loopback_dev, 2);
6641
6642 /*
6643 * Check hash table.
6644 */
6645 spin_lock_bh(&addrconf_hash_lock);
6646 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6647 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6648 spin_unlock_bh(&addrconf_hash_lock);
6649 cancel_delayed_work(&addr_chk_work);
6650 rtnl_unlock();
6651
6652 destroy_workqueue(addrconf_wq);
6653 }
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