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net: rtnetlink: plumb extended ack to doit function
[mirror_ubuntu-hirsute-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 if (!ifp->rt) {
3307 struct rt6_info *rt;
3308
3309 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3310 if (unlikely(IS_ERR(rt)))
3311 return PTR_ERR(rt);
3312
3313 ifp->rt = rt;
3314 }
3315
3316 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3317 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3318 idev->dev, 0, 0);
3319 }
3320
3321 addrconf_dad_start(ifp);
3322
3323 return 0;
3324 }
3325
3326 static void addrconf_permanent_addr(struct net_device *dev)
3327 {
3328 struct inet6_ifaddr *ifp, *tmp;
3329 struct inet6_dev *idev;
3330
3331 idev = __in6_dev_get(dev);
3332 if (!idev)
3333 return;
3334
3335 write_lock_bh(&idev->lock);
3336
3337 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3338 if ((ifp->flags & IFA_F_PERMANENT) &&
3339 fixup_permanent_addr(idev, ifp) < 0) {
3340 write_unlock_bh(&idev->lock);
3341 ipv6_del_addr(ifp);
3342 write_lock_bh(&idev->lock);
3343
3344 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3345 idev->dev->name, &ifp->addr);
3346 }
3347 }
3348
3349 write_unlock_bh(&idev->lock);
3350 }
3351
3352 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3353 void *ptr)
3354 {
3355 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3356 struct netdev_notifier_changeupper_info *info;
3357 struct inet6_dev *idev = __in6_dev_get(dev);
3358 int run_pending = 0;
3359 int err;
3360
3361 switch (event) {
3362 case NETDEV_REGISTER:
3363 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3364 idev = ipv6_add_dev(dev);
3365 if (IS_ERR(idev))
3366 return notifier_from_errno(PTR_ERR(idev));
3367 }
3368 break;
3369
3370 case NETDEV_CHANGEMTU:
3371 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3372 if (dev->mtu < IPV6_MIN_MTU) {
3373 addrconf_ifdown(dev, 1);
3374 break;
3375 }
3376
3377 if (idev) {
3378 rt6_mtu_change(dev, dev->mtu);
3379 idev->cnf.mtu6 = dev->mtu;
3380 break;
3381 }
3382
3383 /* allocate new idev */
3384 idev = ipv6_add_dev(dev);
3385 if (IS_ERR(idev))
3386 break;
3387
3388 /* device is still not ready */
3389 if (!(idev->if_flags & IF_READY))
3390 break;
3391
3392 run_pending = 1;
3393
3394 /* fall through */
3395
3396 case NETDEV_UP:
3397 case NETDEV_CHANGE:
3398 if (dev->flags & IFF_SLAVE)
3399 break;
3400
3401 if (idev && idev->cnf.disable_ipv6)
3402 break;
3403
3404 if (event == NETDEV_UP) {
3405 /* restore routes for permanent addresses */
3406 addrconf_permanent_addr(dev);
3407
3408 if (!addrconf_qdisc_ok(dev)) {
3409 /* device is not ready yet. */
3410 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3411 dev->name);
3412 break;
3413 }
3414
3415 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3416 idev = ipv6_add_dev(dev);
3417
3418 if (!IS_ERR_OR_NULL(idev)) {
3419 idev->if_flags |= IF_READY;
3420 run_pending = 1;
3421 }
3422 } else if (event == NETDEV_CHANGE) {
3423 if (!addrconf_qdisc_ok(dev)) {
3424 /* device is still not ready. */
3425 break;
3426 }
3427
3428 if (idev) {
3429 if (idev->if_flags & IF_READY) {
3430 /* device is already configured -
3431 * but resend MLD reports, we might
3432 * have roamed and need to update
3433 * multicast snooping switches
3434 */
3435 ipv6_mc_up(idev);
3436 break;
3437 }
3438 idev->if_flags |= IF_READY;
3439 }
3440
3441 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3442 dev->name);
3443
3444 run_pending = 1;
3445 }
3446
3447 switch (dev->type) {
3448 #if IS_ENABLED(CONFIG_IPV6_SIT)
3449 case ARPHRD_SIT:
3450 addrconf_sit_config(dev);
3451 break;
3452 #endif
3453 #if IS_ENABLED(CONFIG_NET_IPGRE)
3454 case ARPHRD_IPGRE:
3455 addrconf_gre_config(dev);
3456 break;
3457 #endif
3458 case ARPHRD_LOOPBACK:
3459 init_loopback(dev);
3460 break;
3461
3462 default:
3463 addrconf_dev_config(dev);
3464 break;
3465 }
3466
3467 if (!IS_ERR_OR_NULL(idev)) {
3468 if (run_pending)
3469 addrconf_dad_run(idev);
3470
3471 /*
3472 * If the MTU changed during the interface down,
3473 * when the interface up, the changed MTU must be
3474 * reflected in the idev as well as routers.
3475 */
3476 if (idev->cnf.mtu6 != dev->mtu &&
3477 dev->mtu >= IPV6_MIN_MTU) {
3478 rt6_mtu_change(dev, dev->mtu);
3479 idev->cnf.mtu6 = dev->mtu;
3480 }
3481 idev->tstamp = jiffies;
3482 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3483
3484 /*
3485 * If the changed mtu during down is lower than
3486 * IPV6_MIN_MTU stop IPv6 on this interface.
3487 */
3488 if (dev->mtu < IPV6_MIN_MTU)
3489 addrconf_ifdown(dev, 1);
3490 }
3491 break;
3492
3493 case NETDEV_DOWN:
3494 case NETDEV_UNREGISTER:
3495 /*
3496 * Remove all addresses from this interface.
3497 */
3498 addrconf_ifdown(dev, event != NETDEV_DOWN);
3499 break;
3500
3501 case NETDEV_CHANGENAME:
3502 if (idev) {
3503 snmp6_unregister_dev(idev);
3504 addrconf_sysctl_unregister(idev);
3505 err = addrconf_sysctl_register(idev);
3506 if (err)
3507 return notifier_from_errno(err);
3508 err = snmp6_register_dev(idev);
3509 if (err) {
3510 addrconf_sysctl_unregister(idev);
3511 return notifier_from_errno(err);
3512 }
3513 }
3514 break;
3515
3516 case NETDEV_PRE_TYPE_CHANGE:
3517 case NETDEV_POST_TYPE_CHANGE:
3518 if (idev)
3519 addrconf_type_change(dev, event);
3520 break;
3521
3522 case NETDEV_CHANGEUPPER:
3523 info = ptr;
3524
3525 /* flush all routes if dev is linked to or unlinked from
3526 * an L3 master device (e.g., VRF)
3527 */
3528 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3529 addrconf_ifdown(dev, 0);
3530 }
3531
3532 return NOTIFY_OK;
3533 }
3534
3535 /*
3536 * addrconf module should be notified of a device going up
3537 */
3538 static struct notifier_block ipv6_dev_notf = {
3539 .notifier_call = addrconf_notify,
3540 };
3541
3542 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3543 {
3544 struct inet6_dev *idev;
3545 ASSERT_RTNL();
3546
3547 idev = __in6_dev_get(dev);
3548
3549 if (event == NETDEV_POST_TYPE_CHANGE)
3550 ipv6_mc_remap(idev);
3551 else if (event == NETDEV_PRE_TYPE_CHANGE)
3552 ipv6_mc_unmap(idev);
3553 }
3554
3555 static bool addr_is_local(const struct in6_addr *addr)
3556 {
3557 return ipv6_addr_type(addr) &
3558 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3559 }
3560
3561 static int addrconf_ifdown(struct net_device *dev, int how)
3562 {
3563 struct net *net = dev_net(dev);
3564 struct inet6_dev *idev;
3565 struct inet6_ifaddr *ifa, *tmp;
3566 struct list_head del_list;
3567 int _keep_addr;
3568 bool keep_addr;
3569 int state, i;
3570
3571 ASSERT_RTNL();
3572
3573 rt6_ifdown(net, dev);
3574 neigh_ifdown(&nd_tbl, dev);
3575
3576 idev = __in6_dev_get(dev);
3577 if (!idev)
3578 return -ENODEV;
3579
3580 /*
3581 * Step 1: remove reference to ipv6 device from parent device.
3582 * Do not dev_put!
3583 */
3584 if (how) {
3585 idev->dead = 1;
3586
3587 /* protected by rtnl_lock */
3588 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3589
3590 /* Step 1.5: remove snmp6 entry */
3591 snmp6_unregister_dev(idev);
3592
3593 }
3594
3595 /* aggregate the system setting and interface setting */
3596 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3597 if (!_keep_addr)
3598 _keep_addr = idev->cnf.keep_addr_on_down;
3599
3600 /* combine the user config with event to determine if permanent
3601 * addresses are to be removed from address hash table
3602 */
3603 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3604
3605 /* Step 2: clear hash table */
3606 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3607 struct hlist_head *h = &inet6_addr_lst[i];
3608
3609 spin_lock_bh(&addrconf_hash_lock);
3610 restart:
3611 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3612 if (ifa->idev == idev) {
3613 addrconf_del_dad_work(ifa);
3614 /* combined flag + permanent flag decide if
3615 * address is retained on a down event
3616 */
3617 if (!keep_addr ||
3618 !(ifa->flags & IFA_F_PERMANENT) ||
3619 addr_is_local(&ifa->addr)) {
3620 hlist_del_init_rcu(&ifa->addr_lst);
3621 goto restart;
3622 }
3623 }
3624 }
3625 spin_unlock_bh(&addrconf_hash_lock);
3626 }
3627
3628 write_lock_bh(&idev->lock);
3629
3630 addrconf_del_rs_timer(idev);
3631
3632 /* Step 2: clear flags for stateless addrconf */
3633 if (!how)
3634 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3635
3636 /* Step 3: clear tempaddr list */
3637 while (!list_empty(&idev->tempaddr_list)) {
3638 ifa = list_first_entry(&idev->tempaddr_list,
3639 struct inet6_ifaddr, tmp_list);
3640 list_del(&ifa->tmp_list);
3641 write_unlock_bh(&idev->lock);
3642 spin_lock_bh(&ifa->lock);
3643
3644 if (ifa->ifpub) {
3645 in6_ifa_put(ifa->ifpub);
3646 ifa->ifpub = NULL;
3647 }
3648 spin_unlock_bh(&ifa->lock);
3649 in6_ifa_put(ifa);
3650 write_lock_bh(&idev->lock);
3651 }
3652
3653 /* re-combine the user config with event to determine if permanent
3654 * addresses are to be removed from the interface list
3655 */
3656 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3657
3658 INIT_LIST_HEAD(&del_list);
3659 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3660 struct rt6_info *rt = NULL;
3661 bool keep;
3662
3663 addrconf_del_dad_work(ifa);
3664
3665 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3666 !addr_is_local(&ifa->addr);
3667 if (!keep)
3668 list_move(&ifa->if_list, &del_list);
3669
3670 write_unlock_bh(&idev->lock);
3671 spin_lock_bh(&ifa->lock);
3672
3673 if (keep) {
3674 /* set state to skip the notifier below */
3675 state = INET6_IFADDR_STATE_DEAD;
3676 ifa->state = 0;
3677 if (!(ifa->flags & IFA_F_NODAD))
3678 ifa->flags |= IFA_F_TENTATIVE;
3679
3680 rt = ifa->rt;
3681 ifa->rt = NULL;
3682 } else {
3683 state = ifa->state;
3684 ifa->state = INET6_IFADDR_STATE_DEAD;
3685 }
3686
3687 spin_unlock_bh(&ifa->lock);
3688
3689 if (rt)
3690 ip6_del_rt(rt);
3691
3692 if (state != INET6_IFADDR_STATE_DEAD) {
3693 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3694 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3695 } else {
3696 if (idev->cnf.forwarding)
3697 addrconf_leave_anycast(ifa);
3698 addrconf_leave_solict(ifa->idev, &ifa->addr);
3699 }
3700
3701 write_lock_bh(&idev->lock);
3702 }
3703
3704 write_unlock_bh(&idev->lock);
3705
3706 /* now clean up addresses to be removed */
3707 while (!list_empty(&del_list)) {
3708 ifa = list_first_entry(&del_list,
3709 struct inet6_ifaddr, if_list);
3710 list_del(&ifa->if_list);
3711
3712 in6_ifa_put(ifa);
3713 }
3714
3715 /* Step 5: Discard anycast and multicast list */
3716 if (how) {
3717 ipv6_ac_destroy_dev(idev);
3718 ipv6_mc_destroy_dev(idev);
3719 } else {
3720 ipv6_mc_down(idev);
3721 }
3722
3723 idev->tstamp = jiffies;
3724
3725 /* Last: Shot the device (if unregistered) */
3726 if (how) {
3727 addrconf_sysctl_unregister(idev);
3728 neigh_parms_release(&nd_tbl, idev->nd_parms);
3729 neigh_ifdown(&nd_tbl, dev);
3730 in6_dev_put(idev);
3731 }
3732 return 0;
3733 }
3734
3735 static void addrconf_rs_timer(unsigned long data)
3736 {
3737 struct inet6_dev *idev = (struct inet6_dev *)data;
3738 struct net_device *dev = idev->dev;
3739 struct in6_addr lladdr;
3740
3741 write_lock(&idev->lock);
3742 if (idev->dead || !(idev->if_flags & IF_READY))
3743 goto out;
3744
3745 if (!ipv6_accept_ra(idev))
3746 goto out;
3747
3748 /* Announcement received after solicitation was sent */
3749 if (idev->if_flags & IF_RA_RCVD)
3750 goto out;
3751
3752 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3753 write_unlock(&idev->lock);
3754 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3755 ndisc_send_rs(dev, &lladdr,
3756 &in6addr_linklocal_allrouters);
3757 else
3758 goto put;
3759
3760 write_lock(&idev->lock);
3761 idev->rs_interval = rfc3315_s14_backoff_update(
3762 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3763 /* The wait after the last probe can be shorter */
3764 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3765 idev->cnf.rtr_solicits) ?
3766 idev->cnf.rtr_solicit_delay :
3767 idev->rs_interval);
3768 } else {
3769 /*
3770 * Note: we do not support deprecated "all on-link"
3771 * assumption any longer.
3772 */
3773 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3774 }
3775
3776 out:
3777 write_unlock(&idev->lock);
3778 put:
3779 in6_dev_put(idev);
3780 }
3781
3782 /*
3783 * Duplicate Address Detection
3784 */
3785 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3786 {
3787 unsigned long rand_num;
3788 struct inet6_dev *idev = ifp->idev;
3789 u64 nonce;
3790
3791 if (ifp->flags & IFA_F_OPTIMISTIC)
3792 rand_num = 0;
3793 else
3794 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3795
3796 nonce = 0;
3797 if (idev->cnf.enhanced_dad ||
3798 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3799 do
3800 get_random_bytes(&nonce, 6);
3801 while (nonce == 0);
3802 }
3803 ifp->dad_nonce = nonce;
3804 ifp->dad_probes = idev->cnf.dad_transmits;
3805 addrconf_mod_dad_work(ifp, rand_num);
3806 }
3807
3808 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3809 {
3810 struct inet6_dev *idev = ifp->idev;
3811 struct net_device *dev = idev->dev;
3812 bool bump_id, notify = false;
3813
3814 addrconf_join_solict(dev, &ifp->addr);
3815
3816 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3817
3818 read_lock_bh(&idev->lock);
3819 spin_lock(&ifp->lock);
3820 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3821 goto out;
3822
3823 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3824 idev->cnf.accept_dad < 1 ||
3825 !(ifp->flags&IFA_F_TENTATIVE) ||
3826 ifp->flags & IFA_F_NODAD) {
3827 bump_id = ifp->flags & IFA_F_TENTATIVE;
3828 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3829 spin_unlock(&ifp->lock);
3830 read_unlock_bh(&idev->lock);
3831
3832 addrconf_dad_completed(ifp, bump_id);
3833 return;
3834 }
3835
3836 if (!(idev->if_flags & IF_READY)) {
3837 spin_unlock(&ifp->lock);
3838 read_unlock_bh(&idev->lock);
3839 /*
3840 * If the device is not ready:
3841 * - keep it tentative if it is a permanent address.
3842 * - otherwise, kill it.
3843 */
3844 in6_ifa_hold(ifp);
3845 addrconf_dad_stop(ifp, 0);
3846 return;
3847 }
3848
3849 /*
3850 * Optimistic nodes can start receiving
3851 * Frames right away
3852 */
3853 if (ifp->flags & IFA_F_OPTIMISTIC) {
3854 ip6_ins_rt(ifp->rt);
3855 if (ipv6_use_optimistic_addr(idev)) {
3856 /* Because optimistic nodes can use this address,
3857 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3858 */
3859 notify = true;
3860 }
3861 }
3862
3863 addrconf_dad_kick(ifp);
3864 out:
3865 spin_unlock(&ifp->lock);
3866 read_unlock_bh(&idev->lock);
3867 if (notify)
3868 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3869 }
3870
3871 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3872 {
3873 bool begin_dad = false;
3874
3875 spin_lock_bh(&ifp->lock);
3876 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3877 ifp->state = INET6_IFADDR_STATE_PREDAD;
3878 begin_dad = true;
3879 }
3880 spin_unlock_bh(&ifp->lock);
3881
3882 if (begin_dad)
3883 addrconf_mod_dad_work(ifp, 0);
3884 }
3885
3886 static void addrconf_dad_work(struct work_struct *w)
3887 {
3888 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3889 struct inet6_ifaddr,
3890 dad_work);
3891 struct inet6_dev *idev = ifp->idev;
3892 bool bump_id, disable_ipv6 = false;
3893 struct in6_addr mcaddr;
3894
3895 enum {
3896 DAD_PROCESS,
3897 DAD_BEGIN,
3898 DAD_ABORT,
3899 } action = DAD_PROCESS;
3900
3901 rtnl_lock();
3902
3903 spin_lock_bh(&ifp->lock);
3904 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3905 action = DAD_BEGIN;
3906 ifp->state = INET6_IFADDR_STATE_DAD;
3907 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3908 action = DAD_ABORT;
3909 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3910
3911 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3912 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3913 struct in6_addr addr;
3914
3915 addr.s6_addr32[0] = htonl(0xfe800000);
3916 addr.s6_addr32[1] = 0;
3917
3918 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3919 ipv6_addr_equal(&ifp->addr, &addr)) {
3920 /* DAD failed for link-local based on MAC */
3921 idev->cnf.disable_ipv6 = 1;
3922
3923 pr_info("%s: IPv6 being disabled!\n",
3924 ifp->idev->dev->name);
3925 disable_ipv6 = true;
3926 }
3927 }
3928 }
3929 spin_unlock_bh(&ifp->lock);
3930
3931 if (action == DAD_BEGIN) {
3932 addrconf_dad_begin(ifp);
3933 goto out;
3934 } else if (action == DAD_ABORT) {
3935 in6_ifa_hold(ifp);
3936 addrconf_dad_stop(ifp, 1);
3937 if (disable_ipv6)
3938 addrconf_ifdown(idev->dev, 0);
3939 goto out;
3940 }
3941
3942 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3943 goto out;
3944
3945 write_lock_bh(&idev->lock);
3946 if (idev->dead || !(idev->if_flags & IF_READY)) {
3947 write_unlock_bh(&idev->lock);
3948 goto out;
3949 }
3950
3951 spin_lock(&ifp->lock);
3952 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3953 spin_unlock(&ifp->lock);
3954 write_unlock_bh(&idev->lock);
3955 goto out;
3956 }
3957
3958 if (ifp->dad_probes == 0) {
3959 /*
3960 * DAD was successful
3961 */
3962
3963 bump_id = ifp->flags & IFA_F_TENTATIVE;
3964 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3965 spin_unlock(&ifp->lock);
3966 write_unlock_bh(&idev->lock);
3967
3968 addrconf_dad_completed(ifp, bump_id);
3969
3970 goto out;
3971 }
3972
3973 ifp->dad_probes--;
3974 addrconf_mod_dad_work(ifp,
3975 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3976 spin_unlock(&ifp->lock);
3977 write_unlock_bh(&idev->lock);
3978
3979 /* send a neighbour solicitation for our addr */
3980 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3981 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3982 ifp->dad_nonce);
3983 out:
3984 in6_ifa_put(ifp);
3985 rtnl_unlock();
3986 }
3987
3988 /* ifp->idev must be at least read locked */
3989 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3990 {
3991 struct inet6_ifaddr *ifpiter;
3992 struct inet6_dev *idev = ifp->idev;
3993
3994 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3995 if (ifpiter->scope > IFA_LINK)
3996 break;
3997 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3998 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3999 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4000 IFA_F_PERMANENT)
4001 return false;
4002 }
4003 return true;
4004 }
4005
4006 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
4007 {
4008 struct net_device *dev = ifp->idev->dev;
4009 struct in6_addr lladdr;
4010 bool send_rs, send_mld;
4011
4012 addrconf_del_dad_work(ifp);
4013
4014 /*
4015 * Configure the address for reception. Now it is valid.
4016 */
4017
4018 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4019
4020 /* If added prefix is link local and we are prepared to process
4021 router advertisements, start sending router solicitations.
4022 */
4023
4024 read_lock_bh(&ifp->idev->lock);
4025 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4026 send_rs = send_mld &&
4027 ipv6_accept_ra(ifp->idev) &&
4028 ifp->idev->cnf.rtr_solicits != 0 &&
4029 (dev->flags&IFF_LOOPBACK) == 0;
4030 read_unlock_bh(&ifp->idev->lock);
4031
4032 /* While dad is in progress mld report's source address is in6_addrany.
4033 * Resend with proper ll now.
4034 */
4035 if (send_mld)
4036 ipv6_mc_dad_complete(ifp->idev);
4037
4038 if (send_rs) {
4039 /*
4040 * If a host as already performed a random delay
4041 * [...] as part of DAD [...] there is no need
4042 * to delay again before sending the first RS
4043 */
4044 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4045 return;
4046 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4047
4048 write_lock_bh(&ifp->idev->lock);
4049 spin_lock(&ifp->lock);
4050 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4051 ifp->idev->cnf.rtr_solicit_interval);
4052 ifp->idev->rs_probes = 1;
4053 ifp->idev->if_flags |= IF_RS_SENT;
4054 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4055 spin_unlock(&ifp->lock);
4056 write_unlock_bh(&ifp->idev->lock);
4057 }
4058
4059 if (bump_id)
4060 rt_genid_bump_ipv6(dev_net(dev));
4061
4062 /* Make sure that a new temporary address will be created
4063 * before this temporary address becomes deprecated.
4064 */
4065 if (ifp->flags & IFA_F_TEMPORARY)
4066 addrconf_verify_rtnl();
4067 }
4068
4069 static void addrconf_dad_run(struct inet6_dev *idev)
4070 {
4071 struct inet6_ifaddr *ifp;
4072
4073 read_lock_bh(&idev->lock);
4074 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4075 spin_lock(&ifp->lock);
4076 if (ifp->flags & IFA_F_TENTATIVE &&
4077 ifp->state == INET6_IFADDR_STATE_DAD)
4078 addrconf_dad_kick(ifp);
4079 spin_unlock(&ifp->lock);
4080 }
4081 read_unlock_bh(&idev->lock);
4082 }
4083
4084 #ifdef CONFIG_PROC_FS
4085 struct if6_iter_state {
4086 struct seq_net_private p;
4087 int bucket;
4088 int offset;
4089 };
4090
4091 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4092 {
4093 struct inet6_ifaddr *ifa = NULL;
4094 struct if6_iter_state *state = seq->private;
4095 struct net *net = seq_file_net(seq);
4096 int p = 0;
4097
4098 /* initial bucket if pos is 0 */
4099 if (pos == 0) {
4100 state->bucket = 0;
4101 state->offset = 0;
4102 }
4103
4104 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4105 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4106 addr_lst) {
4107 if (!net_eq(dev_net(ifa->idev->dev), net))
4108 continue;
4109 /* sync with offset */
4110 if (p < state->offset) {
4111 p++;
4112 continue;
4113 }
4114 state->offset++;
4115 return ifa;
4116 }
4117
4118 /* prepare for next bucket */
4119 state->offset = 0;
4120 p = 0;
4121 }
4122 return NULL;
4123 }
4124
4125 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4126 struct inet6_ifaddr *ifa)
4127 {
4128 struct if6_iter_state *state = seq->private;
4129 struct net *net = seq_file_net(seq);
4130
4131 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4132 if (!net_eq(dev_net(ifa->idev->dev), net))
4133 continue;
4134 state->offset++;
4135 return ifa;
4136 }
4137
4138 while (++state->bucket < IN6_ADDR_HSIZE) {
4139 state->offset = 0;
4140 hlist_for_each_entry_rcu_bh(ifa,
4141 &inet6_addr_lst[state->bucket], addr_lst) {
4142 if (!net_eq(dev_net(ifa->idev->dev), net))
4143 continue;
4144 state->offset++;
4145 return ifa;
4146 }
4147 }
4148
4149 return NULL;
4150 }
4151
4152 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4153 __acquires(rcu_bh)
4154 {
4155 rcu_read_lock_bh();
4156 return if6_get_first(seq, *pos);
4157 }
4158
4159 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4160 {
4161 struct inet6_ifaddr *ifa;
4162
4163 ifa = if6_get_next(seq, v);
4164 ++*pos;
4165 return ifa;
4166 }
4167
4168 static void if6_seq_stop(struct seq_file *seq, void *v)
4169 __releases(rcu_bh)
4170 {
4171 rcu_read_unlock_bh();
4172 }
4173
4174 static int if6_seq_show(struct seq_file *seq, void *v)
4175 {
4176 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4177 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4178 &ifp->addr,
4179 ifp->idev->dev->ifindex,
4180 ifp->prefix_len,
4181 ifp->scope,
4182 (u8) ifp->flags,
4183 ifp->idev->dev->name);
4184 return 0;
4185 }
4186
4187 static const struct seq_operations if6_seq_ops = {
4188 .start = if6_seq_start,
4189 .next = if6_seq_next,
4190 .show = if6_seq_show,
4191 .stop = if6_seq_stop,
4192 };
4193
4194 static int if6_seq_open(struct inode *inode, struct file *file)
4195 {
4196 return seq_open_net(inode, file, &if6_seq_ops,
4197 sizeof(struct if6_iter_state));
4198 }
4199
4200 static const struct file_operations if6_fops = {
4201 .owner = THIS_MODULE,
4202 .open = if6_seq_open,
4203 .read = seq_read,
4204 .llseek = seq_lseek,
4205 .release = seq_release_net,
4206 };
4207
4208 static int __net_init if6_proc_net_init(struct net *net)
4209 {
4210 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4211 return -ENOMEM;
4212 return 0;
4213 }
4214
4215 static void __net_exit if6_proc_net_exit(struct net *net)
4216 {
4217 remove_proc_entry("if_inet6", net->proc_net);
4218 }
4219
4220 static struct pernet_operations if6_proc_net_ops = {
4221 .init = if6_proc_net_init,
4222 .exit = if6_proc_net_exit,
4223 };
4224
4225 int __init if6_proc_init(void)
4226 {
4227 return register_pernet_subsys(&if6_proc_net_ops);
4228 }
4229
4230 void if6_proc_exit(void)
4231 {
4232 unregister_pernet_subsys(&if6_proc_net_ops);
4233 }
4234 #endif /* CONFIG_PROC_FS */
4235
4236 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4237 /* Check if address is a home address configured on any interface. */
4238 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4239 {
4240 int ret = 0;
4241 struct inet6_ifaddr *ifp = NULL;
4242 unsigned int hash = inet6_addr_hash(addr);
4243
4244 rcu_read_lock_bh();
4245 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4246 if (!net_eq(dev_net(ifp->idev->dev), net))
4247 continue;
4248 if (ipv6_addr_equal(&ifp->addr, addr) &&
4249 (ifp->flags & IFA_F_HOMEADDRESS)) {
4250 ret = 1;
4251 break;
4252 }
4253 }
4254 rcu_read_unlock_bh();
4255 return ret;
4256 }
4257 #endif
4258
4259 /*
4260 * Periodic address status verification
4261 */
4262
4263 static void addrconf_verify_rtnl(void)
4264 {
4265 unsigned long now, next, next_sec, next_sched;
4266 struct inet6_ifaddr *ifp;
4267 int i;
4268
4269 ASSERT_RTNL();
4270
4271 rcu_read_lock_bh();
4272 now = jiffies;
4273 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4274
4275 cancel_delayed_work(&addr_chk_work);
4276
4277 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4278 restart:
4279 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4280 unsigned long age;
4281
4282 /* When setting preferred_lft to a value not zero or
4283 * infinity, while valid_lft is infinity
4284 * IFA_F_PERMANENT has a non-infinity life time.
4285 */
4286 if ((ifp->flags & IFA_F_PERMANENT) &&
4287 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4288 continue;
4289
4290 spin_lock(&ifp->lock);
4291 /* We try to batch several events at once. */
4292 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4293
4294 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4295 age >= ifp->valid_lft) {
4296 spin_unlock(&ifp->lock);
4297 in6_ifa_hold(ifp);
4298 ipv6_del_addr(ifp);
4299 goto restart;
4300 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4301 spin_unlock(&ifp->lock);
4302 continue;
4303 } else if (age >= ifp->prefered_lft) {
4304 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4305 int deprecate = 0;
4306
4307 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4308 deprecate = 1;
4309 ifp->flags |= IFA_F_DEPRECATED;
4310 }
4311
4312 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4313 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4314 next = ifp->tstamp + ifp->valid_lft * HZ;
4315
4316 spin_unlock(&ifp->lock);
4317
4318 if (deprecate) {
4319 in6_ifa_hold(ifp);
4320
4321 ipv6_ifa_notify(0, ifp);
4322 in6_ifa_put(ifp);
4323 goto restart;
4324 }
4325 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4326 !(ifp->flags&IFA_F_TENTATIVE)) {
4327 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4328 ifp->idev->cnf.dad_transmits *
4329 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4330
4331 if (age >= ifp->prefered_lft - regen_advance) {
4332 struct inet6_ifaddr *ifpub = ifp->ifpub;
4333 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4334 next = ifp->tstamp + ifp->prefered_lft * HZ;
4335 if (!ifp->regen_count && ifpub) {
4336 ifp->regen_count++;
4337 in6_ifa_hold(ifp);
4338 in6_ifa_hold(ifpub);
4339 spin_unlock(&ifp->lock);
4340
4341 spin_lock(&ifpub->lock);
4342 ifpub->regen_count = 0;
4343 spin_unlock(&ifpub->lock);
4344 ipv6_create_tempaddr(ifpub, ifp);
4345 in6_ifa_put(ifpub);
4346 in6_ifa_put(ifp);
4347 goto restart;
4348 }
4349 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4350 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4351 spin_unlock(&ifp->lock);
4352 } else {
4353 /* ifp->prefered_lft <= ifp->valid_lft */
4354 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4355 next = ifp->tstamp + ifp->prefered_lft * HZ;
4356 spin_unlock(&ifp->lock);
4357 }
4358 }
4359 }
4360
4361 next_sec = round_jiffies_up(next);
4362 next_sched = next;
4363
4364 /* If rounded timeout is accurate enough, accept it. */
4365 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4366 next_sched = next_sec;
4367
4368 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4369 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4370 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4371
4372 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4373 now, next, next_sec, next_sched);
4374 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4375 rcu_read_unlock_bh();
4376 }
4377
4378 static void addrconf_verify_work(struct work_struct *w)
4379 {
4380 rtnl_lock();
4381 addrconf_verify_rtnl();
4382 rtnl_unlock();
4383 }
4384
4385 static void addrconf_verify(void)
4386 {
4387 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4388 }
4389
4390 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4391 struct in6_addr **peer_pfx)
4392 {
4393 struct in6_addr *pfx = NULL;
4394
4395 *peer_pfx = NULL;
4396
4397 if (addr)
4398 pfx = nla_data(addr);
4399
4400 if (local) {
4401 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4402 *peer_pfx = pfx;
4403 pfx = nla_data(local);
4404 }
4405
4406 return pfx;
4407 }
4408
4409 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4410 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4411 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4412 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4413 [IFA_FLAGS] = { .len = sizeof(u32) },
4414 };
4415
4416 static int
4417 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4418 struct netlink_ext_ack *extack)
4419 {
4420 struct net *net = sock_net(skb->sk);
4421 struct ifaddrmsg *ifm;
4422 struct nlattr *tb[IFA_MAX+1];
4423 struct in6_addr *pfx, *peer_pfx;
4424 u32 ifa_flags;
4425 int err;
4426
4427 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4428 extack);
4429 if (err < 0)
4430 return err;
4431
4432 ifm = nlmsg_data(nlh);
4433 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4434 if (!pfx)
4435 return -EINVAL;
4436
4437 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4438
4439 /* We ignore other flags so far. */
4440 ifa_flags &= IFA_F_MANAGETEMPADDR;
4441
4442 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4443 ifm->ifa_prefixlen);
4444 }
4445
4446 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4447 u32 prefered_lft, u32 valid_lft)
4448 {
4449 u32 flags;
4450 clock_t expires;
4451 unsigned long timeout;
4452 bool was_managetempaddr;
4453 bool had_prefixroute;
4454
4455 ASSERT_RTNL();
4456
4457 if (!valid_lft || (prefered_lft > valid_lft))
4458 return -EINVAL;
4459
4460 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4461 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4462 return -EINVAL;
4463
4464 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4465 if (addrconf_finite_timeout(timeout)) {
4466 expires = jiffies_to_clock_t(timeout * HZ);
4467 valid_lft = timeout;
4468 flags = RTF_EXPIRES;
4469 } else {
4470 expires = 0;
4471 flags = 0;
4472 ifa_flags |= IFA_F_PERMANENT;
4473 }
4474
4475 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4476 if (addrconf_finite_timeout(timeout)) {
4477 if (timeout == 0)
4478 ifa_flags |= IFA_F_DEPRECATED;
4479 prefered_lft = timeout;
4480 }
4481
4482 spin_lock_bh(&ifp->lock);
4483 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4484 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4485 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4486 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4487 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4488 IFA_F_NOPREFIXROUTE);
4489 ifp->flags |= ifa_flags;
4490 ifp->tstamp = jiffies;
4491 ifp->valid_lft = valid_lft;
4492 ifp->prefered_lft = prefered_lft;
4493
4494 spin_unlock_bh(&ifp->lock);
4495 if (!(ifp->flags&IFA_F_TENTATIVE))
4496 ipv6_ifa_notify(0, ifp);
4497
4498 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4499 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4500 expires, flags);
4501 } else if (had_prefixroute) {
4502 enum cleanup_prefix_rt_t action;
4503 unsigned long rt_expires;
4504
4505 write_lock_bh(&ifp->idev->lock);
4506 action = check_cleanup_prefix_route(ifp, &rt_expires);
4507 write_unlock_bh(&ifp->idev->lock);
4508
4509 if (action != CLEANUP_PREFIX_RT_NOP) {
4510 cleanup_prefix_route(ifp, rt_expires,
4511 action == CLEANUP_PREFIX_RT_DEL);
4512 }
4513 }
4514
4515 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4516 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4517 valid_lft = prefered_lft = 0;
4518 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4519 !was_managetempaddr, jiffies);
4520 }
4521
4522 addrconf_verify_rtnl();
4523
4524 return 0;
4525 }
4526
4527 static int
4528 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4529 struct netlink_ext_ack *extack)
4530 {
4531 struct net *net = sock_net(skb->sk);
4532 struct ifaddrmsg *ifm;
4533 struct nlattr *tb[IFA_MAX+1];
4534 struct in6_addr *pfx, *peer_pfx;
4535 struct inet6_ifaddr *ifa;
4536 struct net_device *dev;
4537 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4538 u32 ifa_flags;
4539 int err;
4540
4541 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4542 extack);
4543 if (err < 0)
4544 return err;
4545
4546 ifm = nlmsg_data(nlh);
4547 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4548 if (!pfx)
4549 return -EINVAL;
4550
4551 if (tb[IFA_CACHEINFO]) {
4552 struct ifa_cacheinfo *ci;
4553
4554 ci = nla_data(tb[IFA_CACHEINFO]);
4555 valid_lft = ci->ifa_valid;
4556 preferred_lft = ci->ifa_prefered;
4557 } else {
4558 preferred_lft = INFINITY_LIFE_TIME;
4559 valid_lft = INFINITY_LIFE_TIME;
4560 }
4561
4562 dev = __dev_get_by_index(net, ifm->ifa_index);
4563 if (!dev)
4564 return -ENODEV;
4565
4566 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4567
4568 /* We ignore other flags so far. */
4569 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4570 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4571
4572 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4573 if (!ifa) {
4574 /*
4575 * It would be best to check for !NLM_F_CREATE here but
4576 * userspace already relies on not having to provide this.
4577 */
4578 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4579 ifm->ifa_prefixlen, ifa_flags,
4580 preferred_lft, valid_lft);
4581 }
4582
4583 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4584 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4585 err = -EEXIST;
4586 else
4587 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4588
4589 in6_ifa_put(ifa);
4590
4591 return err;
4592 }
4593
4594 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4595 u8 scope, int ifindex)
4596 {
4597 struct ifaddrmsg *ifm;
4598
4599 ifm = nlmsg_data(nlh);
4600 ifm->ifa_family = AF_INET6;
4601 ifm->ifa_prefixlen = prefixlen;
4602 ifm->ifa_flags = flags;
4603 ifm->ifa_scope = scope;
4604 ifm->ifa_index = ifindex;
4605 }
4606
4607 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4608 unsigned long tstamp, u32 preferred, u32 valid)
4609 {
4610 struct ifa_cacheinfo ci;
4611
4612 ci.cstamp = cstamp_delta(cstamp);
4613 ci.tstamp = cstamp_delta(tstamp);
4614 ci.ifa_prefered = preferred;
4615 ci.ifa_valid = valid;
4616
4617 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4618 }
4619
4620 static inline int rt_scope(int ifa_scope)
4621 {
4622 if (ifa_scope & IFA_HOST)
4623 return RT_SCOPE_HOST;
4624 else if (ifa_scope & IFA_LINK)
4625 return RT_SCOPE_LINK;
4626 else if (ifa_scope & IFA_SITE)
4627 return RT_SCOPE_SITE;
4628 else
4629 return RT_SCOPE_UNIVERSE;
4630 }
4631
4632 static inline int inet6_ifaddr_msgsize(void)
4633 {
4634 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4635 + nla_total_size(16) /* IFA_LOCAL */
4636 + nla_total_size(16) /* IFA_ADDRESS */
4637 + nla_total_size(sizeof(struct ifa_cacheinfo))
4638 + nla_total_size(4) /* IFA_FLAGS */;
4639 }
4640
4641 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4642 u32 portid, u32 seq, int event, unsigned int flags)
4643 {
4644 struct nlmsghdr *nlh;
4645 u32 preferred, valid;
4646
4647 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4648 if (!nlh)
4649 return -EMSGSIZE;
4650
4651 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4652 ifa->idev->dev->ifindex);
4653
4654 if (!((ifa->flags&IFA_F_PERMANENT) &&
4655 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4656 preferred = ifa->prefered_lft;
4657 valid = ifa->valid_lft;
4658 if (preferred != INFINITY_LIFE_TIME) {
4659 long tval = (jiffies - ifa->tstamp)/HZ;
4660 if (preferred > tval)
4661 preferred -= tval;
4662 else
4663 preferred = 0;
4664 if (valid != INFINITY_LIFE_TIME) {
4665 if (valid > tval)
4666 valid -= tval;
4667 else
4668 valid = 0;
4669 }
4670 }
4671 } else {
4672 preferred = INFINITY_LIFE_TIME;
4673 valid = INFINITY_LIFE_TIME;
4674 }
4675
4676 if (!ipv6_addr_any(&ifa->peer_addr)) {
4677 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4678 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4679 goto error;
4680 } else
4681 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4682 goto error;
4683
4684 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4685 goto error;
4686
4687 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4688 goto error;
4689
4690 nlmsg_end(skb, nlh);
4691 return 0;
4692
4693 error:
4694 nlmsg_cancel(skb, nlh);
4695 return -EMSGSIZE;
4696 }
4697
4698 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4699 u32 portid, u32 seq, int event, u16 flags)
4700 {
4701 struct nlmsghdr *nlh;
4702 u8 scope = RT_SCOPE_UNIVERSE;
4703 int ifindex = ifmca->idev->dev->ifindex;
4704
4705 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4706 scope = RT_SCOPE_SITE;
4707
4708 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4709 if (!nlh)
4710 return -EMSGSIZE;
4711
4712 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4713 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4714 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4715 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4716 nlmsg_cancel(skb, nlh);
4717 return -EMSGSIZE;
4718 }
4719
4720 nlmsg_end(skb, nlh);
4721 return 0;
4722 }
4723
4724 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4725 u32 portid, u32 seq, int event, unsigned int flags)
4726 {
4727 struct nlmsghdr *nlh;
4728 u8 scope = RT_SCOPE_UNIVERSE;
4729 int ifindex = ifaca->aca_idev->dev->ifindex;
4730
4731 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4732 scope = RT_SCOPE_SITE;
4733
4734 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4735 if (!nlh)
4736 return -EMSGSIZE;
4737
4738 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4739 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4740 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4741 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4742 nlmsg_cancel(skb, nlh);
4743 return -EMSGSIZE;
4744 }
4745
4746 nlmsg_end(skb, nlh);
4747 return 0;
4748 }
4749
4750 enum addr_type_t {
4751 UNICAST_ADDR,
4752 MULTICAST_ADDR,
4753 ANYCAST_ADDR,
4754 };
4755
4756 /* called with rcu_read_lock() */
4757 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4758 struct netlink_callback *cb, enum addr_type_t type,
4759 int s_ip_idx, int *p_ip_idx)
4760 {
4761 struct ifmcaddr6 *ifmca;
4762 struct ifacaddr6 *ifaca;
4763 int err = 1;
4764 int ip_idx = *p_ip_idx;
4765
4766 read_lock_bh(&idev->lock);
4767 switch (type) {
4768 case UNICAST_ADDR: {
4769 struct inet6_ifaddr *ifa;
4770
4771 /* unicast address incl. temp addr */
4772 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4773 if (++ip_idx < s_ip_idx)
4774 continue;
4775 err = inet6_fill_ifaddr(skb, ifa,
4776 NETLINK_CB(cb->skb).portid,
4777 cb->nlh->nlmsg_seq,
4778 RTM_NEWADDR,
4779 NLM_F_MULTI);
4780 if (err < 0)
4781 break;
4782 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4783 }
4784 break;
4785 }
4786 case MULTICAST_ADDR:
4787 /* multicast address */
4788 for (ifmca = idev->mc_list; ifmca;
4789 ifmca = ifmca->next, ip_idx++) {
4790 if (ip_idx < s_ip_idx)
4791 continue;
4792 err = inet6_fill_ifmcaddr(skb, ifmca,
4793 NETLINK_CB(cb->skb).portid,
4794 cb->nlh->nlmsg_seq,
4795 RTM_GETMULTICAST,
4796 NLM_F_MULTI);
4797 if (err < 0)
4798 break;
4799 }
4800 break;
4801 case ANYCAST_ADDR:
4802 /* anycast address */
4803 for (ifaca = idev->ac_list; ifaca;
4804 ifaca = ifaca->aca_next, ip_idx++) {
4805 if (ip_idx < s_ip_idx)
4806 continue;
4807 err = inet6_fill_ifacaddr(skb, ifaca,
4808 NETLINK_CB(cb->skb).portid,
4809 cb->nlh->nlmsg_seq,
4810 RTM_GETANYCAST,
4811 NLM_F_MULTI);
4812 if (err < 0)
4813 break;
4814 }
4815 break;
4816 default:
4817 break;
4818 }
4819 read_unlock_bh(&idev->lock);
4820 *p_ip_idx = ip_idx;
4821 return err;
4822 }
4823
4824 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4825 enum addr_type_t type)
4826 {
4827 struct net *net = sock_net(skb->sk);
4828 int h, s_h;
4829 int idx, ip_idx;
4830 int s_idx, s_ip_idx;
4831 struct net_device *dev;
4832 struct inet6_dev *idev;
4833 struct hlist_head *head;
4834
4835 s_h = cb->args[0];
4836 s_idx = idx = cb->args[1];
4837 s_ip_idx = ip_idx = cb->args[2];
4838
4839 rcu_read_lock();
4840 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4841 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4842 idx = 0;
4843 head = &net->dev_index_head[h];
4844 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4845 if (idx < s_idx)
4846 goto cont;
4847 if (h > s_h || idx > s_idx)
4848 s_ip_idx = 0;
4849 ip_idx = 0;
4850 idev = __in6_dev_get(dev);
4851 if (!idev)
4852 goto cont;
4853
4854 if (in6_dump_addrs(idev, skb, cb, type,
4855 s_ip_idx, &ip_idx) < 0)
4856 goto done;
4857 cont:
4858 idx++;
4859 }
4860 }
4861 done:
4862 rcu_read_unlock();
4863 cb->args[0] = h;
4864 cb->args[1] = idx;
4865 cb->args[2] = ip_idx;
4866
4867 return skb->len;
4868 }
4869
4870 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4871 {
4872 enum addr_type_t type = UNICAST_ADDR;
4873
4874 return inet6_dump_addr(skb, cb, type);
4875 }
4876
4877 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4878 {
4879 enum addr_type_t type = MULTICAST_ADDR;
4880
4881 return inet6_dump_addr(skb, cb, type);
4882 }
4883
4884
4885 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4886 {
4887 enum addr_type_t type = ANYCAST_ADDR;
4888
4889 return inet6_dump_addr(skb, cb, type);
4890 }
4891
4892 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
4893 struct netlink_ext_ack *extack)
4894 {
4895 struct net *net = sock_net(in_skb->sk);
4896 struct ifaddrmsg *ifm;
4897 struct nlattr *tb[IFA_MAX+1];
4898 struct in6_addr *addr = NULL, *peer;
4899 struct net_device *dev = NULL;
4900 struct inet6_ifaddr *ifa;
4901 struct sk_buff *skb;
4902 int err;
4903
4904 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy,
4905 extack);
4906 if (err < 0)
4907 goto errout;
4908
4909 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4910 if (!addr) {
4911 err = -EINVAL;
4912 goto errout;
4913 }
4914
4915 ifm = nlmsg_data(nlh);
4916 if (ifm->ifa_index)
4917 dev = __dev_get_by_index(net, ifm->ifa_index);
4918
4919 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4920 if (!ifa) {
4921 err = -EADDRNOTAVAIL;
4922 goto errout;
4923 }
4924
4925 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4926 if (!skb) {
4927 err = -ENOBUFS;
4928 goto errout_ifa;
4929 }
4930
4931 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4932 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4933 if (err < 0) {
4934 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4935 WARN_ON(err == -EMSGSIZE);
4936 kfree_skb(skb);
4937 goto errout_ifa;
4938 }
4939 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4940 errout_ifa:
4941 in6_ifa_put(ifa);
4942 errout:
4943 return err;
4944 }
4945
4946 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4947 {
4948 struct sk_buff *skb;
4949 struct net *net = dev_net(ifa->idev->dev);
4950 int err = -ENOBUFS;
4951
4952 /* Don't send DELADDR notification for TENTATIVE address,
4953 * since NEWADDR notification is sent only after removing
4954 * TENTATIVE flag.
4955 */
4956 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4957 return;
4958
4959 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4960 if (!skb)
4961 goto errout;
4962
4963 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4964 if (err < 0) {
4965 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4966 WARN_ON(err == -EMSGSIZE);
4967 kfree_skb(skb);
4968 goto errout;
4969 }
4970 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4971 return;
4972 errout:
4973 if (err < 0)
4974 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4975 }
4976
4977 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4978 __s32 *array, int bytes)
4979 {
4980 BUG_ON(bytes < (DEVCONF_MAX * 4));
4981
4982 memset(array, 0, bytes);
4983 array[DEVCONF_FORWARDING] = cnf->forwarding;
4984 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4985 array[DEVCONF_MTU6] = cnf->mtu6;
4986 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4987 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4988 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4989 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4990 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4991 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4992 jiffies_to_msecs(cnf->rtr_solicit_interval);
4993 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4994 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
4995 array[DEVCONF_RTR_SOLICIT_DELAY] =
4996 jiffies_to_msecs(cnf->rtr_solicit_delay);
4997 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4998 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4999 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5000 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5001 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5002 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5003 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5004 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5005 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5006 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5007 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5008 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5009 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5010 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5011 #ifdef CONFIG_IPV6_ROUTER_PREF
5012 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5013 array[DEVCONF_RTR_PROBE_INTERVAL] =
5014 jiffies_to_msecs(cnf->rtr_probe_interval);
5015 #ifdef CONFIG_IPV6_ROUTE_INFO
5016 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5017 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5018 #endif
5019 #endif
5020 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5021 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5022 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5023 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5024 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5025 #endif
5026 #ifdef CONFIG_IPV6_MROUTE
5027 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5028 #endif
5029 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5030 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5031 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5032 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5033 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5034 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5035 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5036 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5037 /* we omit DEVCONF_STABLE_SECRET for now */
5038 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5039 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5040 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5041 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5042 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5043 #ifdef CONFIG_IPV6_SEG6_HMAC
5044 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5045 #endif
5046 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5047 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5048 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5049 }
5050
5051 static inline size_t inet6_ifla6_size(void)
5052 {
5053 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5054 + nla_total_size(sizeof(struct ifla_cacheinfo))
5055 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5056 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5057 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5058 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5059 }
5060
5061 static inline size_t inet6_if_nlmsg_size(void)
5062 {
5063 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5064 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5065 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5066 + nla_total_size(4) /* IFLA_MTU */
5067 + nla_total_size(4) /* IFLA_LINK */
5068 + nla_total_size(1) /* IFLA_OPERSTATE */
5069 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5070 }
5071
5072 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5073 int bytes)
5074 {
5075 int i;
5076 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5077 BUG_ON(pad < 0);
5078
5079 /* Use put_unaligned() because stats may not be aligned for u64. */
5080 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5081 for (i = 1; i < ICMP6_MIB_MAX; i++)
5082 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5083
5084 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5085 }
5086
5087 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5088 int bytes, size_t syncpoff)
5089 {
5090 int i, c;
5091 u64 buff[IPSTATS_MIB_MAX];
5092 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5093
5094 BUG_ON(pad < 0);
5095
5096 memset(buff, 0, sizeof(buff));
5097 buff[0] = IPSTATS_MIB_MAX;
5098
5099 for_each_possible_cpu(c) {
5100 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5101 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5102 }
5103
5104 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5105 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5106 }
5107
5108 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5109 int bytes)
5110 {
5111 switch (attrtype) {
5112 case IFLA_INET6_STATS:
5113 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5114 offsetof(struct ipstats_mib, syncp));
5115 break;
5116 case IFLA_INET6_ICMP6STATS:
5117 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5118 break;
5119 }
5120 }
5121
5122 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5123 u32 ext_filter_mask)
5124 {
5125 struct nlattr *nla;
5126 struct ifla_cacheinfo ci;
5127
5128 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5129 goto nla_put_failure;
5130 ci.max_reasm_len = IPV6_MAXPLEN;
5131 ci.tstamp = cstamp_delta(idev->tstamp);
5132 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5133 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5134 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5135 goto nla_put_failure;
5136 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5137 if (!nla)
5138 goto nla_put_failure;
5139 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5140
5141 /* XXX - MC not implemented */
5142
5143 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5144 return 0;
5145
5146 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5147 if (!nla)
5148 goto nla_put_failure;
5149 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5150
5151 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5152 if (!nla)
5153 goto nla_put_failure;
5154 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5155
5156 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5157 if (!nla)
5158 goto nla_put_failure;
5159
5160 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5161 goto nla_put_failure;
5162
5163 read_lock_bh(&idev->lock);
5164 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5165 read_unlock_bh(&idev->lock);
5166
5167 return 0;
5168
5169 nla_put_failure:
5170 return -EMSGSIZE;
5171 }
5172
5173 static size_t inet6_get_link_af_size(const struct net_device *dev,
5174 u32 ext_filter_mask)
5175 {
5176 if (!__in6_dev_get(dev))
5177 return 0;
5178
5179 return inet6_ifla6_size();
5180 }
5181
5182 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5183 u32 ext_filter_mask)
5184 {
5185 struct inet6_dev *idev = __in6_dev_get(dev);
5186
5187 if (!idev)
5188 return -ENODATA;
5189
5190 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5191 return -EMSGSIZE;
5192
5193 return 0;
5194 }
5195
5196 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5197 {
5198 struct inet6_ifaddr *ifp;
5199 struct net_device *dev = idev->dev;
5200 bool clear_token, update_rs = false;
5201 struct in6_addr ll_addr;
5202
5203 ASSERT_RTNL();
5204
5205 if (!token)
5206 return -EINVAL;
5207 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5208 return -EINVAL;
5209 if (!ipv6_accept_ra(idev))
5210 return -EINVAL;
5211 if (idev->cnf.rtr_solicits == 0)
5212 return -EINVAL;
5213
5214 write_lock_bh(&idev->lock);
5215
5216 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5217 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5218
5219 write_unlock_bh(&idev->lock);
5220
5221 clear_token = ipv6_addr_any(token);
5222 if (clear_token)
5223 goto update_lft;
5224
5225 if (!idev->dead && (idev->if_flags & IF_READY) &&
5226 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5227 IFA_F_OPTIMISTIC)) {
5228 /* If we're not ready, then normal ifup will take care
5229 * of this. Otherwise, we need to request our rs here.
5230 */
5231 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5232 update_rs = true;
5233 }
5234
5235 update_lft:
5236 write_lock_bh(&idev->lock);
5237
5238 if (update_rs) {
5239 idev->if_flags |= IF_RS_SENT;
5240 idev->rs_interval = rfc3315_s14_backoff_init(
5241 idev->cnf.rtr_solicit_interval);
5242 idev->rs_probes = 1;
5243 addrconf_mod_rs_timer(idev, idev->rs_interval);
5244 }
5245
5246 /* Well, that's kinda nasty ... */
5247 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5248 spin_lock(&ifp->lock);
5249 if (ifp->tokenized) {
5250 ifp->valid_lft = 0;
5251 ifp->prefered_lft = 0;
5252 }
5253 spin_unlock(&ifp->lock);
5254 }
5255
5256 write_unlock_bh(&idev->lock);
5257 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5258 addrconf_verify_rtnl();
5259 return 0;
5260 }
5261
5262 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5263 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5264 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5265 };
5266
5267 static int inet6_validate_link_af(const struct net_device *dev,
5268 const struct nlattr *nla)
5269 {
5270 struct nlattr *tb[IFLA_INET6_MAX + 1];
5271
5272 if (dev && !__in6_dev_get(dev))
5273 return -EAFNOSUPPORT;
5274
5275 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy,
5276 NULL);
5277 }
5278
5279 static int check_addr_gen_mode(int mode)
5280 {
5281 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5282 mode != IN6_ADDR_GEN_MODE_NONE &&
5283 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5284 mode != IN6_ADDR_GEN_MODE_RANDOM)
5285 return -EINVAL;
5286 return 1;
5287 }
5288
5289 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5290 int mode)
5291 {
5292 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5293 !idev->cnf.stable_secret.initialized &&
5294 !net->ipv6.devconf_dflt->stable_secret.initialized)
5295 return -EINVAL;
5296 return 1;
5297 }
5298
5299 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5300 {
5301 int err = -EINVAL;
5302 struct inet6_dev *idev = __in6_dev_get(dev);
5303 struct nlattr *tb[IFLA_INET6_MAX + 1];
5304
5305 if (!idev)
5306 return -EAFNOSUPPORT;
5307
5308 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5309 BUG();
5310
5311 if (tb[IFLA_INET6_TOKEN]) {
5312 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5313 if (err)
5314 return err;
5315 }
5316
5317 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5318 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5319
5320 if (check_addr_gen_mode(mode) < 0 ||
5321 check_stable_privacy(idev, dev_net(dev), mode) < 0)
5322 return -EINVAL;
5323
5324 idev->cnf.addr_gen_mode = mode;
5325 err = 0;
5326 }
5327
5328 return err;
5329 }
5330
5331 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5332 u32 portid, u32 seq, int event, unsigned int flags)
5333 {
5334 struct net_device *dev = idev->dev;
5335 struct ifinfomsg *hdr;
5336 struct nlmsghdr *nlh;
5337 void *protoinfo;
5338
5339 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5340 if (!nlh)
5341 return -EMSGSIZE;
5342
5343 hdr = nlmsg_data(nlh);
5344 hdr->ifi_family = AF_INET6;
5345 hdr->__ifi_pad = 0;
5346 hdr->ifi_type = dev->type;
5347 hdr->ifi_index = dev->ifindex;
5348 hdr->ifi_flags = dev_get_flags(dev);
5349 hdr->ifi_change = 0;
5350
5351 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5352 (dev->addr_len &&
5353 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5354 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5355 (dev->ifindex != dev_get_iflink(dev) &&
5356 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5357 nla_put_u8(skb, IFLA_OPERSTATE,
5358 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5359 goto nla_put_failure;
5360 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5361 if (!protoinfo)
5362 goto nla_put_failure;
5363
5364 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5365 goto nla_put_failure;
5366
5367 nla_nest_end(skb, protoinfo);
5368 nlmsg_end(skb, nlh);
5369 return 0;
5370
5371 nla_put_failure:
5372 nlmsg_cancel(skb, nlh);
5373 return -EMSGSIZE;
5374 }
5375
5376 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5377 {
5378 struct net *net = sock_net(skb->sk);
5379 int h, s_h;
5380 int idx = 0, s_idx;
5381 struct net_device *dev;
5382 struct inet6_dev *idev;
5383 struct hlist_head *head;
5384
5385 s_h = cb->args[0];
5386 s_idx = cb->args[1];
5387
5388 rcu_read_lock();
5389 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5390 idx = 0;
5391 head = &net->dev_index_head[h];
5392 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5393 if (idx < s_idx)
5394 goto cont;
5395 idev = __in6_dev_get(dev);
5396 if (!idev)
5397 goto cont;
5398 if (inet6_fill_ifinfo(skb, idev,
5399 NETLINK_CB(cb->skb).portid,
5400 cb->nlh->nlmsg_seq,
5401 RTM_NEWLINK, NLM_F_MULTI) < 0)
5402 goto out;
5403 cont:
5404 idx++;
5405 }
5406 }
5407 out:
5408 rcu_read_unlock();
5409 cb->args[1] = idx;
5410 cb->args[0] = h;
5411
5412 return skb->len;
5413 }
5414
5415 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5416 {
5417 struct sk_buff *skb;
5418 struct net *net = dev_net(idev->dev);
5419 int err = -ENOBUFS;
5420
5421 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5422 if (!skb)
5423 goto errout;
5424
5425 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5426 if (err < 0) {
5427 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5428 WARN_ON(err == -EMSGSIZE);
5429 kfree_skb(skb);
5430 goto errout;
5431 }
5432 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5433 return;
5434 errout:
5435 if (err < 0)
5436 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5437 }
5438
5439 static inline size_t inet6_prefix_nlmsg_size(void)
5440 {
5441 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5442 + nla_total_size(sizeof(struct in6_addr))
5443 + nla_total_size(sizeof(struct prefix_cacheinfo));
5444 }
5445
5446 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5447 struct prefix_info *pinfo, u32 portid, u32 seq,
5448 int event, unsigned int flags)
5449 {
5450 struct prefixmsg *pmsg;
5451 struct nlmsghdr *nlh;
5452 struct prefix_cacheinfo ci;
5453
5454 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5455 if (!nlh)
5456 return -EMSGSIZE;
5457
5458 pmsg = nlmsg_data(nlh);
5459 pmsg->prefix_family = AF_INET6;
5460 pmsg->prefix_pad1 = 0;
5461 pmsg->prefix_pad2 = 0;
5462 pmsg->prefix_ifindex = idev->dev->ifindex;
5463 pmsg->prefix_len = pinfo->prefix_len;
5464 pmsg->prefix_type = pinfo->type;
5465 pmsg->prefix_pad3 = 0;
5466 pmsg->prefix_flags = 0;
5467 if (pinfo->onlink)
5468 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5469 if (pinfo->autoconf)
5470 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5471
5472 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5473 goto nla_put_failure;
5474 ci.preferred_time = ntohl(pinfo->prefered);
5475 ci.valid_time = ntohl(pinfo->valid);
5476 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5477 goto nla_put_failure;
5478 nlmsg_end(skb, nlh);
5479 return 0;
5480
5481 nla_put_failure:
5482 nlmsg_cancel(skb, nlh);
5483 return -EMSGSIZE;
5484 }
5485
5486 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5487 struct prefix_info *pinfo)
5488 {
5489 struct sk_buff *skb;
5490 struct net *net = dev_net(idev->dev);
5491 int err = -ENOBUFS;
5492
5493 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5494 if (!skb)
5495 goto errout;
5496
5497 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5498 if (err < 0) {
5499 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5500 WARN_ON(err == -EMSGSIZE);
5501 kfree_skb(skb);
5502 goto errout;
5503 }
5504 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5505 return;
5506 errout:
5507 if (err < 0)
5508 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5509 }
5510
5511 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5512 {
5513 struct net *net = dev_net(ifp->idev->dev);
5514
5515 if (event)
5516 ASSERT_RTNL();
5517
5518 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5519
5520 switch (event) {
5521 case RTM_NEWADDR:
5522 /*
5523 * If the address was optimistic
5524 * we inserted the route at the start of
5525 * our DAD process, so we don't need
5526 * to do it again
5527 */
5528 if (!(ifp->rt->rt6i_node))
5529 ip6_ins_rt(ifp->rt);
5530 if (ifp->idev->cnf.forwarding)
5531 addrconf_join_anycast(ifp);
5532 if (!ipv6_addr_any(&ifp->peer_addr))
5533 addrconf_prefix_route(&ifp->peer_addr, 128,
5534 ifp->idev->dev, 0, 0);
5535 break;
5536 case RTM_DELADDR:
5537 if (ifp->idev->cnf.forwarding)
5538 addrconf_leave_anycast(ifp);
5539 addrconf_leave_solict(ifp->idev, &ifp->addr);
5540 if (!ipv6_addr_any(&ifp->peer_addr)) {
5541 struct rt6_info *rt;
5542
5543 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5544 ifp->idev->dev, 0, 0);
5545 if (rt)
5546 ip6_del_rt(rt);
5547 }
5548 if (ifp->rt) {
5549 dst_hold(&ifp->rt->dst);
5550 ip6_del_rt(ifp->rt);
5551 }
5552 rt_genid_bump_ipv6(net);
5553 break;
5554 }
5555 atomic_inc(&net->ipv6.dev_addr_genid);
5556 }
5557
5558 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5559 {
5560 rcu_read_lock_bh();
5561 if (likely(ifp->idev->dead == 0))
5562 __ipv6_ifa_notify(event, ifp);
5563 rcu_read_unlock_bh();
5564 }
5565
5566 #ifdef CONFIG_SYSCTL
5567
5568 static
5569 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5570 void __user *buffer, size_t *lenp, loff_t *ppos)
5571 {
5572 int *valp = ctl->data;
5573 int val = *valp;
5574 loff_t pos = *ppos;
5575 struct ctl_table lctl;
5576 int ret;
5577
5578 /*
5579 * ctl->data points to idev->cnf.forwarding, we should
5580 * not modify it until we get the rtnl lock.
5581 */
5582 lctl = *ctl;
5583 lctl.data = &val;
5584
5585 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5586
5587 if (write)
5588 ret = addrconf_fixup_forwarding(ctl, valp, val);
5589 if (ret)
5590 *ppos = pos;
5591 return ret;
5592 }
5593
5594 static
5595 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5596 void __user *buffer, size_t *lenp, loff_t *ppos)
5597 {
5598 struct inet6_dev *idev = ctl->extra1;
5599 int min_mtu = IPV6_MIN_MTU;
5600 struct ctl_table lctl;
5601
5602 lctl = *ctl;
5603 lctl.extra1 = &min_mtu;
5604 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5605
5606 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5607 }
5608
5609 static void dev_disable_change(struct inet6_dev *idev)
5610 {
5611 struct netdev_notifier_info info;
5612
5613 if (!idev || !idev->dev)
5614 return;
5615
5616 netdev_notifier_info_init(&info, idev->dev);
5617 if (idev->cnf.disable_ipv6)
5618 addrconf_notify(NULL, NETDEV_DOWN, &info);
5619 else
5620 addrconf_notify(NULL, NETDEV_UP, &info);
5621 }
5622
5623 static void addrconf_disable_change(struct net *net, __s32 newf)
5624 {
5625 struct net_device *dev;
5626 struct inet6_dev *idev;
5627
5628 for_each_netdev(net, dev) {
5629 idev = __in6_dev_get(dev);
5630 if (idev) {
5631 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5632 idev->cnf.disable_ipv6 = newf;
5633 if (changed)
5634 dev_disable_change(idev);
5635 }
5636 }
5637 }
5638
5639 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5640 {
5641 struct net *net;
5642 int old;
5643
5644 if (!rtnl_trylock())
5645 return restart_syscall();
5646
5647 net = (struct net *)table->extra2;
5648 old = *p;
5649 *p = newf;
5650
5651 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5652 rtnl_unlock();
5653 return 0;
5654 }
5655
5656 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5657 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5658 addrconf_disable_change(net, newf);
5659 } else if ((!newf) ^ (!old))
5660 dev_disable_change((struct inet6_dev *)table->extra1);
5661
5662 rtnl_unlock();
5663 return 0;
5664 }
5665
5666 static
5667 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5668 void __user *buffer, size_t *lenp, loff_t *ppos)
5669 {
5670 int *valp = ctl->data;
5671 int val = *valp;
5672 loff_t pos = *ppos;
5673 struct ctl_table lctl;
5674 int ret;
5675
5676 /*
5677 * ctl->data points to idev->cnf.disable_ipv6, we should
5678 * not modify it until we get the rtnl lock.
5679 */
5680 lctl = *ctl;
5681 lctl.data = &val;
5682
5683 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5684
5685 if (write)
5686 ret = addrconf_disable_ipv6(ctl, valp, val);
5687 if (ret)
5688 *ppos = pos;
5689 return ret;
5690 }
5691
5692 static
5693 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5694 void __user *buffer, size_t *lenp, loff_t *ppos)
5695 {
5696 int *valp = ctl->data;
5697 int ret;
5698 int old, new;
5699
5700 old = *valp;
5701 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5702 new = *valp;
5703
5704 if (write && old != new) {
5705 struct net *net = ctl->extra2;
5706
5707 if (!rtnl_trylock())
5708 return restart_syscall();
5709
5710 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5711 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5712 NETCONFA_PROXY_NEIGH,
5713 NETCONFA_IFINDEX_DEFAULT,
5714 net->ipv6.devconf_dflt);
5715 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5716 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5717 NETCONFA_PROXY_NEIGH,
5718 NETCONFA_IFINDEX_ALL,
5719 net->ipv6.devconf_all);
5720 else {
5721 struct inet6_dev *idev = ctl->extra1;
5722
5723 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
5724 NETCONFA_PROXY_NEIGH,
5725 idev->dev->ifindex,
5726 &idev->cnf);
5727 }
5728 rtnl_unlock();
5729 }
5730
5731 return ret;
5732 }
5733
5734 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5735 void __user *buffer, size_t *lenp,
5736 loff_t *ppos)
5737 {
5738 int ret = 0;
5739 int new_val;
5740 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5741 struct net *net = (struct net *)ctl->extra2;
5742
5743 if (!rtnl_trylock())
5744 return restart_syscall();
5745
5746 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5747
5748 if (write) {
5749 new_val = *((int *)ctl->data);
5750
5751 if (check_addr_gen_mode(new_val) < 0) {
5752 ret = -EINVAL;
5753 goto out;
5754 }
5755
5756 /* request for default */
5757 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5758 ipv6_devconf_dflt.addr_gen_mode = new_val;
5759
5760 /* request for individual net device */
5761 } else {
5762 if (!idev)
5763 goto out;
5764
5765 if (check_stable_privacy(idev, net, new_val) < 0) {
5766 ret = -EINVAL;
5767 goto out;
5768 }
5769
5770 if (idev->cnf.addr_gen_mode != new_val) {
5771 idev->cnf.addr_gen_mode = new_val;
5772 addrconf_dev_config(idev->dev);
5773 }
5774 }
5775 }
5776
5777 out:
5778 rtnl_unlock();
5779
5780 return ret;
5781 }
5782
5783 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5784 void __user *buffer, size_t *lenp,
5785 loff_t *ppos)
5786 {
5787 int err;
5788 struct in6_addr addr;
5789 char str[IPV6_MAX_STRLEN];
5790 struct ctl_table lctl = *ctl;
5791 struct net *net = ctl->extra2;
5792 struct ipv6_stable_secret *secret = ctl->data;
5793
5794 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5795 return -EIO;
5796
5797 lctl.maxlen = IPV6_MAX_STRLEN;
5798 lctl.data = str;
5799
5800 if (!rtnl_trylock())
5801 return restart_syscall();
5802
5803 if (!write && !secret->initialized) {
5804 err = -EIO;
5805 goto out;
5806 }
5807
5808 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5809 if (err >= sizeof(str)) {
5810 err = -EIO;
5811 goto out;
5812 }
5813
5814 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5815 if (err || !write)
5816 goto out;
5817
5818 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5819 err = -EIO;
5820 goto out;
5821 }
5822
5823 secret->initialized = true;
5824 secret->secret = addr;
5825
5826 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5827 struct net_device *dev;
5828
5829 for_each_netdev(net, dev) {
5830 struct inet6_dev *idev = __in6_dev_get(dev);
5831
5832 if (idev) {
5833 idev->cnf.addr_gen_mode =
5834 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5835 }
5836 }
5837 } else {
5838 struct inet6_dev *idev = ctl->extra1;
5839
5840 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5841 }
5842
5843 out:
5844 rtnl_unlock();
5845
5846 return err;
5847 }
5848
5849 static
5850 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5851 int write,
5852 void __user *buffer,
5853 size_t *lenp,
5854 loff_t *ppos)
5855 {
5856 int *valp = ctl->data;
5857 int val = *valp;
5858 loff_t pos = *ppos;
5859 struct ctl_table lctl;
5860 int ret;
5861
5862 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5863 * we should not modify it until we get the rtnl lock.
5864 */
5865 lctl = *ctl;
5866 lctl.data = &val;
5867
5868 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5869
5870 if (write)
5871 ret = addrconf_fixup_linkdown(ctl, valp, val);
5872 if (ret)
5873 *ppos = pos;
5874 return ret;
5875 }
5876
5877 static
5878 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
5879 {
5880 if (rt) {
5881 if (action)
5882 rt->dst.flags |= DST_NOPOLICY;
5883 else
5884 rt->dst.flags &= ~DST_NOPOLICY;
5885 }
5886 }
5887
5888 static
5889 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
5890 {
5891 struct inet6_ifaddr *ifa;
5892
5893 read_lock_bh(&idev->lock);
5894 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5895 spin_lock(&ifa->lock);
5896 if (ifa->rt) {
5897 struct rt6_info *rt = ifa->rt;
5898 struct fib6_table *table = rt->rt6i_table;
5899 int cpu;
5900
5901 read_lock(&table->tb6_lock);
5902 addrconf_set_nopolicy(ifa->rt, val);
5903 if (rt->rt6i_pcpu) {
5904 for_each_possible_cpu(cpu) {
5905 struct rt6_info **rtp;
5906
5907 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
5908 addrconf_set_nopolicy(*rtp, val);
5909 }
5910 }
5911 read_unlock(&table->tb6_lock);
5912 }
5913 spin_unlock(&ifa->lock);
5914 }
5915 read_unlock_bh(&idev->lock);
5916 }
5917
5918 static
5919 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
5920 {
5921 struct inet6_dev *idev;
5922 struct net *net;
5923
5924 if (!rtnl_trylock())
5925 return restart_syscall();
5926
5927 *valp = val;
5928
5929 net = (struct net *)ctl->extra2;
5930 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
5931 rtnl_unlock();
5932 return 0;
5933 }
5934
5935 if (valp == &net->ipv6.devconf_all->disable_policy) {
5936 struct net_device *dev;
5937
5938 for_each_netdev(net, dev) {
5939 idev = __in6_dev_get(dev);
5940 if (idev)
5941 addrconf_disable_policy_idev(idev, val);
5942 }
5943 } else {
5944 idev = (struct inet6_dev *)ctl->extra1;
5945 addrconf_disable_policy_idev(idev, val);
5946 }
5947
5948 rtnl_unlock();
5949 return 0;
5950 }
5951
5952 static
5953 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
5954 void __user *buffer, size_t *lenp,
5955 loff_t *ppos)
5956 {
5957 int *valp = ctl->data;
5958 int val = *valp;
5959 loff_t pos = *ppos;
5960 struct ctl_table lctl;
5961 int ret;
5962
5963 lctl = *ctl;
5964 lctl.data = &val;
5965 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5966
5967 if (write && (*valp != val))
5968 ret = addrconf_disable_policy(ctl, valp, val);
5969
5970 if (ret)
5971 *ppos = pos;
5972
5973 return ret;
5974 }
5975
5976 static int minus_one = -1;
5977 static const int one = 1;
5978 static const int two_five_five = 255;
5979
5980 static const struct ctl_table addrconf_sysctl[] = {
5981 {
5982 .procname = "forwarding",
5983 .data = &ipv6_devconf.forwarding,
5984 .maxlen = sizeof(int),
5985 .mode = 0644,
5986 .proc_handler = addrconf_sysctl_forward,
5987 },
5988 {
5989 .procname = "hop_limit",
5990 .data = &ipv6_devconf.hop_limit,
5991 .maxlen = sizeof(int),
5992 .mode = 0644,
5993 .proc_handler = proc_dointvec_minmax,
5994 .extra1 = (void *)&one,
5995 .extra2 = (void *)&two_five_five,
5996 },
5997 {
5998 .procname = "mtu",
5999 .data = &ipv6_devconf.mtu6,
6000 .maxlen = sizeof(int),
6001 .mode = 0644,
6002 .proc_handler = addrconf_sysctl_mtu,
6003 },
6004 {
6005 .procname = "accept_ra",
6006 .data = &ipv6_devconf.accept_ra,
6007 .maxlen = sizeof(int),
6008 .mode = 0644,
6009 .proc_handler = proc_dointvec,
6010 },
6011 {
6012 .procname = "accept_redirects",
6013 .data = &ipv6_devconf.accept_redirects,
6014 .maxlen = sizeof(int),
6015 .mode = 0644,
6016 .proc_handler = proc_dointvec,
6017 },
6018 {
6019 .procname = "autoconf",
6020 .data = &ipv6_devconf.autoconf,
6021 .maxlen = sizeof(int),
6022 .mode = 0644,
6023 .proc_handler = proc_dointvec,
6024 },
6025 {
6026 .procname = "dad_transmits",
6027 .data = &ipv6_devconf.dad_transmits,
6028 .maxlen = sizeof(int),
6029 .mode = 0644,
6030 .proc_handler = proc_dointvec,
6031 },
6032 {
6033 .procname = "router_solicitations",
6034 .data = &ipv6_devconf.rtr_solicits,
6035 .maxlen = sizeof(int),
6036 .mode = 0644,
6037 .proc_handler = proc_dointvec_minmax,
6038 .extra1 = &minus_one,
6039 },
6040 {
6041 .procname = "router_solicitation_interval",
6042 .data = &ipv6_devconf.rtr_solicit_interval,
6043 .maxlen = sizeof(int),
6044 .mode = 0644,
6045 .proc_handler = proc_dointvec_jiffies,
6046 },
6047 {
6048 .procname = "router_solicitation_max_interval",
6049 .data = &ipv6_devconf.rtr_solicit_max_interval,
6050 .maxlen = sizeof(int),
6051 .mode = 0644,
6052 .proc_handler = proc_dointvec_jiffies,
6053 },
6054 {
6055 .procname = "router_solicitation_delay",
6056 .data = &ipv6_devconf.rtr_solicit_delay,
6057 .maxlen = sizeof(int),
6058 .mode = 0644,
6059 .proc_handler = proc_dointvec_jiffies,
6060 },
6061 {
6062 .procname = "force_mld_version",
6063 .data = &ipv6_devconf.force_mld_version,
6064 .maxlen = sizeof(int),
6065 .mode = 0644,
6066 .proc_handler = proc_dointvec,
6067 },
6068 {
6069 .procname = "mldv1_unsolicited_report_interval",
6070 .data =
6071 &ipv6_devconf.mldv1_unsolicited_report_interval,
6072 .maxlen = sizeof(int),
6073 .mode = 0644,
6074 .proc_handler = proc_dointvec_ms_jiffies,
6075 },
6076 {
6077 .procname = "mldv2_unsolicited_report_interval",
6078 .data =
6079 &ipv6_devconf.mldv2_unsolicited_report_interval,
6080 .maxlen = sizeof(int),
6081 .mode = 0644,
6082 .proc_handler = proc_dointvec_ms_jiffies,
6083 },
6084 {
6085 .procname = "use_tempaddr",
6086 .data = &ipv6_devconf.use_tempaddr,
6087 .maxlen = sizeof(int),
6088 .mode = 0644,
6089 .proc_handler = proc_dointvec,
6090 },
6091 {
6092 .procname = "temp_valid_lft",
6093 .data = &ipv6_devconf.temp_valid_lft,
6094 .maxlen = sizeof(int),
6095 .mode = 0644,
6096 .proc_handler = proc_dointvec,
6097 },
6098 {
6099 .procname = "temp_prefered_lft",
6100 .data = &ipv6_devconf.temp_prefered_lft,
6101 .maxlen = sizeof(int),
6102 .mode = 0644,
6103 .proc_handler = proc_dointvec,
6104 },
6105 {
6106 .procname = "regen_max_retry",
6107 .data = &ipv6_devconf.regen_max_retry,
6108 .maxlen = sizeof(int),
6109 .mode = 0644,
6110 .proc_handler = proc_dointvec,
6111 },
6112 {
6113 .procname = "max_desync_factor",
6114 .data = &ipv6_devconf.max_desync_factor,
6115 .maxlen = sizeof(int),
6116 .mode = 0644,
6117 .proc_handler = proc_dointvec,
6118 },
6119 {
6120 .procname = "max_addresses",
6121 .data = &ipv6_devconf.max_addresses,
6122 .maxlen = sizeof(int),
6123 .mode = 0644,
6124 .proc_handler = proc_dointvec,
6125 },
6126 {
6127 .procname = "accept_ra_defrtr",
6128 .data = &ipv6_devconf.accept_ra_defrtr,
6129 .maxlen = sizeof(int),
6130 .mode = 0644,
6131 .proc_handler = proc_dointvec,
6132 },
6133 {
6134 .procname = "accept_ra_min_hop_limit",
6135 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6136 .maxlen = sizeof(int),
6137 .mode = 0644,
6138 .proc_handler = proc_dointvec,
6139 },
6140 {
6141 .procname = "accept_ra_pinfo",
6142 .data = &ipv6_devconf.accept_ra_pinfo,
6143 .maxlen = sizeof(int),
6144 .mode = 0644,
6145 .proc_handler = proc_dointvec,
6146 },
6147 #ifdef CONFIG_IPV6_ROUTER_PREF
6148 {
6149 .procname = "accept_ra_rtr_pref",
6150 .data = &ipv6_devconf.accept_ra_rtr_pref,
6151 .maxlen = sizeof(int),
6152 .mode = 0644,
6153 .proc_handler = proc_dointvec,
6154 },
6155 {
6156 .procname = "router_probe_interval",
6157 .data = &ipv6_devconf.rtr_probe_interval,
6158 .maxlen = sizeof(int),
6159 .mode = 0644,
6160 .proc_handler = proc_dointvec_jiffies,
6161 },
6162 #ifdef CONFIG_IPV6_ROUTE_INFO
6163 {
6164 .procname = "accept_ra_rt_info_min_plen",
6165 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6166 .maxlen = sizeof(int),
6167 .mode = 0644,
6168 .proc_handler = proc_dointvec,
6169 },
6170 {
6171 .procname = "accept_ra_rt_info_max_plen",
6172 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6173 .maxlen = sizeof(int),
6174 .mode = 0644,
6175 .proc_handler = proc_dointvec,
6176 },
6177 #endif
6178 #endif
6179 {
6180 .procname = "proxy_ndp",
6181 .data = &ipv6_devconf.proxy_ndp,
6182 .maxlen = sizeof(int),
6183 .mode = 0644,
6184 .proc_handler = addrconf_sysctl_proxy_ndp,
6185 },
6186 {
6187 .procname = "accept_source_route",
6188 .data = &ipv6_devconf.accept_source_route,
6189 .maxlen = sizeof(int),
6190 .mode = 0644,
6191 .proc_handler = proc_dointvec,
6192 },
6193 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6194 {
6195 .procname = "optimistic_dad",
6196 .data = &ipv6_devconf.optimistic_dad,
6197 .maxlen = sizeof(int),
6198 .mode = 0644,
6199 .proc_handler = proc_dointvec,
6200 },
6201 {
6202 .procname = "use_optimistic",
6203 .data = &ipv6_devconf.use_optimistic,
6204 .maxlen = sizeof(int),
6205 .mode = 0644,
6206 .proc_handler = proc_dointvec,
6207 },
6208 #endif
6209 #ifdef CONFIG_IPV6_MROUTE
6210 {
6211 .procname = "mc_forwarding",
6212 .data = &ipv6_devconf.mc_forwarding,
6213 .maxlen = sizeof(int),
6214 .mode = 0444,
6215 .proc_handler = proc_dointvec,
6216 },
6217 #endif
6218 {
6219 .procname = "disable_ipv6",
6220 .data = &ipv6_devconf.disable_ipv6,
6221 .maxlen = sizeof(int),
6222 .mode = 0644,
6223 .proc_handler = addrconf_sysctl_disable,
6224 },
6225 {
6226 .procname = "accept_dad",
6227 .data = &ipv6_devconf.accept_dad,
6228 .maxlen = sizeof(int),
6229 .mode = 0644,
6230 .proc_handler = proc_dointvec,
6231 },
6232 {
6233 .procname = "force_tllao",
6234 .data = &ipv6_devconf.force_tllao,
6235 .maxlen = sizeof(int),
6236 .mode = 0644,
6237 .proc_handler = proc_dointvec
6238 },
6239 {
6240 .procname = "ndisc_notify",
6241 .data = &ipv6_devconf.ndisc_notify,
6242 .maxlen = sizeof(int),
6243 .mode = 0644,
6244 .proc_handler = proc_dointvec
6245 },
6246 {
6247 .procname = "suppress_frag_ndisc",
6248 .data = &ipv6_devconf.suppress_frag_ndisc,
6249 .maxlen = sizeof(int),
6250 .mode = 0644,
6251 .proc_handler = proc_dointvec
6252 },
6253 {
6254 .procname = "accept_ra_from_local",
6255 .data = &ipv6_devconf.accept_ra_from_local,
6256 .maxlen = sizeof(int),
6257 .mode = 0644,
6258 .proc_handler = proc_dointvec,
6259 },
6260 {
6261 .procname = "accept_ra_mtu",
6262 .data = &ipv6_devconf.accept_ra_mtu,
6263 .maxlen = sizeof(int),
6264 .mode = 0644,
6265 .proc_handler = proc_dointvec,
6266 },
6267 {
6268 .procname = "stable_secret",
6269 .data = &ipv6_devconf.stable_secret,
6270 .maxlen = IPV6_MAX_STRLEN,
6271 .mode = 0600,
6272 .proc_handler = addrconf_sysctl_stable_secret,
6273 },
6274 {
6275 .procname = "use_oif_addrs_only",
6276 .data = &ipv6_devconf.use_oif_addrs_only,
6277 .maxlen = sizeof(int),
6278 .mode = 0644,
6279 .proc_handler = proc_dointvec,
6280 },
6281 {
6282 .procname = "ignore_routes_with_linkdown",
6283 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6284 .maxlen = sizeof(int),
6285 .mode = 0644,
6286 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6287 },
6288 {
6289 .procname = "drop_unicast_in_l2_multicast",
6290 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6291 .maxlen = sizeof(int),
6292 .mode = 0644,
6293 .proc_handler = proc_dointvec,
6294 },
6295 {
6296 .procname = "drop_unsolicited_na",
6297 .data = &ipv6_devconf.drop_unsolicited_na,
6298 .maxlen = sizeof(int),
6299 .mode = 0644,
6300 .proc_handler = proc_dointvec,
6301 },
6302 {
6303 .procname = "keep_addr_on_down",
6304 .data = &ipv6_devconf.keep_addr_on_down,
6305 .maxlen = sizeof(int),
6306 .mode = 0644,
6307 .proc_handler = proc_dointvec,
6308
6309 },
6310 {
6311 .procname = "seg6_enabled",
6312 .data = &ipv6_devconf.seg6_enabled,
6313 .maxlen = sizeof(int),
6314 .mode = 0644,
6315 .proc_handler = proc_dointvec,
6316 },
6317 #ifdef CONFIG_IPV6_SEG6_HMAC
6318 {
6319 .procname = "seg6_require_hmac",
6320 .data = &ipv6_devconf.seg6_require_hmac,
6321 .maxlen = sizeof(int),
6322 .mode = 0644,
6323 .proc_handler = proc_dointvec,
6324 },
6325 #endif
6326 {
6327 .procname = "enhanced_dad",
6328 .data = &ipv6_devconf.enhanced_dad,
6329 .maxlen = sizeof(int),
6330 .mode = 0644,
6331 .proc_handler = proc_dointvec,
6332 },
6333 {
6334 .procname = "addr_gen_mode",
6335 .data = &ipv6_devconf.addr_gen_mode,
6336 .maxlen = sizeof(int),
6337 .mode = 0644,
6338 .proc_handler = addrconf_sysctl_addr_gen_mode,
6339 },
6340 {
6341 .procname = "disable_policy",
6342 .data = &ipv6_devconf.disable_policy,
6343 .maxlen = sizeof(int),
6344 .mode = 0644,
6345 .proc_handler = addrconf_sysctl_disable_policy,
6346 },
6347 {
6348 /* sentinel */
6349 }
6350 };
6351
6352 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6353 struct inet6_dev *idev, struct ipv6_devconf *p)
6354 {
6355 int i, ifindex;
6356 struct ctl_table *table;
6357 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6358
6359 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6360 if (!table)
6361 goto out;
6362
6363 for (i = 0; table[i].data; i++) {
6364 table[i].data += (char *)p - (char *)&ipv6_devconf;
6365 /* If one of these is already set, then it is not safe to
6366 * overwrite either of them: this makes proc_dointvec_minmax
6367 * usable.
6368 */
6369 if (!table[i].extra1 && !table[i].extra2) {
6370 table[i].extra1 = idev; /* embedded; no ref */
6371 table[i].extra2 = net;
6372 }
6373 }
6374
6375 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6376
6377 p->sysctl_header = register_net_sysctl(net, path, table);
6378 if (!p->sysctl_header)
6379 goto free;
6380
6381 if (!strcmp(dev_name, "all"))
6382 ifindex = NETCONFA_IFINDEX_ALL;
6383 else if (!strcmp(dev_name, "default"))
6384 ifindex = NETCONFA_IFINDEX_DEFAULT;
6385 else
6386 ifindex = idev->dev->ifindex;
6387 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6388 ifindex, p);
6389 return 0;
6390
6391 free:
6392 kfree(table);
6393 out:
6394 return -ENOBUFS;
6395 }
6396
6397 static void __addrconf_sysctl_unregister(struct net *net,
6398 struct ipv6_devconf *p, int ifindex)
6399 {
6400 struct ctl_table *table;
6401
6402 if (!p->sysctl_header)
6403 return;
6404
6405 table = p->sysctl_header->ctl_table_arg;
6406 unregister_net_sysctl_table(p->sysctl_header);
6407 p->sysctl_header = NULL;
6408 kfree(table);
6409
6410 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6411 }
6412
6413 static int addrconf_sysctl_register(struct inet6_dev *idev)
6414 {
6415 int err;
6416
6417 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6418 return -EINVAL;
6419
6420 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6421 &ndisc_ifinfo_sysctl_change);
6422 if (err)
6423 return err;
6424 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6425 idev, &idev->cnf);
6426 if (err)
6427 neigh_sysctl_unregister(idev->nd_parms);
6428
6429 return err;
6430 }
6431
6432 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6433 {
6434 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6435 idev->dev->ifindex);
6436 neigh_sysctl_unregister(idev->nd_parms);
6437 }
6438
6439
6440 #endif
6441
6442 static int __net_init addrconf_init_net(struct net *net)
6443 {
6444 int err = -ENOMEM;
6445 struct ipv6_devconf *all, *dflt;
6446
6447 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6448 if (!all)
6449 goto err_alloc_all;
6450
6451 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6452 if (!dflt)
6453 goto err_alloc_dflt;
6454
6455 /* these will be inherited by all namespaces */
6456 dflt->autoconf = ipv6_defaults.autoconf;
6457 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6458
6459 dflt->stable_secret.initialized = false;
6460 all->stable_secret.initialized = false;
6461
6462 net->ipv6.devconf_all = all;
6463 net->ipv6.devconf_dflt = dflt;
6464
6465 #ifdef CONFIG_SYSCTL
6466 err = __addrconf_sysctl_register(net, "all", NULL, all);
6467 if (err < 0)
6468 goto err_reg_all;
6469
6470 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6471 if (err < 0)
6472 goto err_reg_dflt;
6473 #endif
6474 return 0;
6475
6476 #ifdef CONFIG_SYSCTL
6477 err_reg_dflt:
6478 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6479 err_reg_all:
6480 kfree(dflt);
6481 #endif
6482 err_alloc_dflt:
6483 kfree(all);
6484 err_alloc_all:
6485 return err;
6486 }
6487
6488 static void __net_exit addrconf_exit_net(struct net *net)
6489 {
6490 #ifdef CONFIG_SYSCTL
6491 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6492 NETCONFA_IFINDEX_DEFAULT);
6493 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6494 NETCONFA_IFINDEX_ALL);
6495 #endif
6496 kfree(net->ipv6.devconf_dflt);
6497 kfree(net->ipv6.devconf_all);
6498 }
6499
6500 static struct pernet_operations addrconf_ops = {
6501 .init = addrconf_init_net,
6502 .exit = addrconf_exit_net,
6503 };
6504
6505 static struct rtnl_af_ops inet6_ops __read_mostly = {
6506 .family = AF_INET6,
6507 .fill_link_af = inet6_fill_link_af,
6508 .get_link_af_size = inet6_get_link_af_size,
6509 .validate_link_af = inet6_validate_link_af,
6510 .set_link_af = inet6_set_link_af,
6511 };
6512
6513 /*
6514 * Init / cleanup code
6515 */
6516
6517 int __init addrconf_init(void)
6518 {
6519 struct inet6_dev *idev;
6520 int i, err;
6521
6522 err = ipv6_addr_label_init();
6523 if (err < 0) {
6524 pr_crit("%s: cannot initialize default policy table: %d\n",
6525 __func__, err);
6526 goto out;
6527 }
6528
6529 err = register_pernet_subsys(&addrconf_ops);
6530 if (err < 0)
6531 goto out_addrlabel;
6532
6533 addrconf_wq = create_workqueue("ipv6_addrconf");
6534 if (!addrconf_wq) {
6535 err = -ENOMEM;
6536 goto out_nowq;
6537 }
6538
6539 /* The addrconf netdev notifier requires that loopback_dev
6540 * has it's ipv6 private information allocated and setup
6541 * before it can bring up and give link-local addresses
6542 * to other devices which are up.
6543 *
6544 * Unfortunately, loopback_dev is not necessarily the first
6545 * entry in the global dev_base list of net devices. In fact,
6546 * it is likely to be the very last entry on that list.
6547 * So this causes the notifier registry below to try and
6548 * give link-local addresses to all devices besides loopback_dev
6549 * first, then loopback_dev, which cases all the non-loopback_dev
6550 * devices to fail to get a link-local address.
6551 *
6552 * So, as a temporary fix, allocate the ipv6 structure for
6553 * loopback_dev first by hand.
6554 * Longer term, all of the dependencies ipv6 has upon the loopback
6555 * device and it being up should be removed.
6556 */
6557 rtnl_lock();
6558 idev = ipv6_add_dev(init_net.loopback_dev);
6559 rtnl_unlock();
6560 if (IS_ERR(idev)) {
6561 err = PTR_ERR(idev);
6562 goto errlo;
6563 }
6564
6565 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6566 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6567
6568 register_netdevice_notifier(&ipv6_dev_notf);
6569
6570 addrconf_verify();
6571
6572 rtnl_af_register(&inet6_ops);
6573
6574 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6575 NULL);
6576 if (err < 0)
6577 goto errout;
6578
6579 /* Only the first call to __rtnl_register can fail */
6580 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6581 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6582 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6583 inet6_dump_ifaddr, NULL);
6584 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6585 inet6_dump_ifmcaddr, NULL);
6586 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6587 inet6_dump_ifacaddr, NULL);
6588 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6589 inet6_netconf_dump_devconf, NULL);
6590
6591 ipv6_addr_label_rtnl_register();
6592
6593 return 0;
6594 errout:
6595 rtnl_af_unregister(&inet6_ops);
6596 unregister_netdevice_notifier(&ipv6_dev_notf);
6597 errlo:
6598 destroy_workqueue(addrconf_wq);
6599 out_nowq:
6600 unregister_pernet_subsys(&addrconf_ops);
6601 out_addrlabel:
6602 ipv6_addr_label_cleanup();
6603 out:
6604 return err;
6605 }
6606
6607 void addrconf_cleanup(void)
6608 {
6609 struct net_device *dev;
6610 int i;
6611
6612 unregister_netdevice_notifier(&ipv6_dev_notf);
6613 unregister_pernet_subsys(&addrconf_ops);
6614 ipv6_addr_label_cleanup();
6615
6616 rtnl_lock();
6617
6618 __rtnl_af_unregister(&inet6_ops);
6619
6620 /* clean dev list */
6621 for_each_netdev(&init_net, dev) {
6622 if (__in6_dev_get(dev) == NULL)
6623 continue;
6624 addrconf_ifdown(dev, 1);
6625 }
6626 addrconf_ifdown(init_net.loopback_dev, 2);
6627
6628 /*
6629 * Check hash table.
6630 */
6631 spin_lock_bh(&addrconf_hash_lock);
6632 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6633 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6634 spin_unlock_bh(&addrconf_hash_lock);
6635 cancel_delayed_work(&addr_chk_work);
6636 rtnl_unlock();
6637
6638 destroy_workqueue(addrconf_wq);
6639 }
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