]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/ipv6/addrconf.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[mirror_ubuntu-artful-kernel.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_addr.h>
53 #include <linux/if_arp.h>
54 #include <linux/if_arcnet.h>
55 #include <linux/if_infiniband.h>
56 #include <linux/route.h>
57 #include <linux/inetdevice.h>
58 #include <linux/init.h>
59 #include <linux/slab.h>
60 #ifdef CONFIG_SYSCTL
61 #include <linux/sysctl.h>
62 #endif
63 #include <linux/capability.h>
64 #include <linux/delay.h>
65 #include <linux/notifier.h>
66 #include <linux/string.h>
67 #include <linux/hash.h>
68
69 #include <net/net_namespace.h>
70 #include <net/sock.h>
71 #include <net/snmp.h>
72
73 #include <net/6lowpan.h>
74 #include <net/firewire.h>
75 #include <net/ipv6.h>
76 #include <net/protocol.h>
77 #include <net/ndisc.h>
78 #include <net/ip6_route.h>
79 #include <net/addrconf.h>
80 #include <net/tcp.h>
81 #include <net/ip.h>
82 #include <net/netlink.h>
83 #include <net/pkt_sched.h>
84 #include <net/l3mdev.h>
85 #include <linux/if_tunnel.h>
86 #include <linux/rtnetlink.h>
87 #include <linux/netconf.h>
88 #include <linux/random.h>
89 #include <linux/uaccess.h>
90 #include <asm/unaligned.h>
91
92 #include <linux/proc_fs.h>
93 #include <linux/seq_file.h>
94 #include <linux/export.h>
95
96 /* Set to 3 to get tracing... */
97 #define ACONF_DEBUG 2
98
99 #if ACONF_DEBUG >= 3
100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
101 #else
102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
103 #endif
104
105 #define INFINITY_LIFE_TIME 0xFFFFFFFF
106
107 #define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
110 static inline u32 cstamp_delta(unsigned long cstamp)
111 {
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113 }
114
115 static inline s32 rfc3315_s14_backoff_init(s32 irt)
116 {
117 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
118 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
119 do_div(tmp, 1000000);
120 return (s32)tmp;
121 }
122
123 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
124 {
125 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
126 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
127 do_div(tmp, 1000000);
128 if ((s32)tmp > mrt) {
129 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
130 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
131 do_div(tmp, 1000000);
132 }
133 return (s32)tmp;
134 }
135
136 #ifdef CONFIG_SYSCTL
137 static int addrconf_sysctl_register(struct inet6_dev *idev);
138 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
139 #else
140 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
141 {
142 return 0;
143 }
144
145 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
146 {
147 }
148 #endif
149
150 static void ipv6_regen_rndid(struct inet6_dev *idev);
151 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
152
153 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
154 static int ipv6_count_addresses(struct inet6_dev *idev);
155 static int ipv6_generate_stable_address(struct in6_addr *addr,
156 u8 dad_count,
157 const struct inet6_dev *idev);
158
159 /*
160 * Configured unicast address hash table
161 */
162 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
163 static DEFINE_SPINLOCK(addrconf_hash_lock);
164
165 static void addrconf_verify(void);
166 static void addrconf_verify_rtnl(void);
167 static void addrconf_verify_work(struct work_struct *);
168
169 static struct workqueue_struct *addrconf_wq;
170 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
171
172 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
173 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
174
175 static void addrconf_type_change(struct net_device *dev,
176 unsigned long event);
177 static int addrconf_ifdown(struct net_device *dev, int how);
178
179 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
180 int plen,
181 const struct net_device *dev,
182 u32 flags, u32 noflags);
183
184 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
185 static void addrconf_dad_work(struct work_struct *w);
186 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id);
187 static void addrconf_dad_run(struct inet6_dev *idev);
188 static void addrconf_rs_timer(unsigned long data);
189 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
190 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
191
192 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
193 struct prefix_info *pinfo);
194 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
195 struct net_device *dev);
196
197 static struct ipv6_devconf ipv6_devconf __read_mostly = {
198 .forwarding = 0,
199 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
200 .mtu6 = IPV6_MIN_MTU,
201 .accept_ra = 1,
202 .accept_redirects = 1,
203 .autoconf = 1,
204 .force_mld_version = 0,
205 .mldv1_unsolicited_report_interval = 10 * HZ,
206 .mldv2_unsolicited_report_interval = HZ,
207 .dad_transmits = 1,
208 .rtr_solicits = MAX_RTR_SOLICITATIONS,
209 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
210 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
211 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
212 .use_tempaddr = 0,
213 .temp_valid_lft = TEMP_VALID_LIFETIME,
214 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
215 .regen_max_retry = REGEN_MAX_RETRY,
216 .max_desync_factor = MAX_DESYNC_FACTOR,
217 .max_addresses = IPV6_MAX_ADDRESSES,
218 .accept_ra_defrtr = 1,
219 .accept_ra_from_local = 0,
220 .accept_ra_min_hop_limit= 1,
221 .accept_ra_pinfo = 1,
222 #ifdef CONFIG_IPV6_ROUTER_PREF
223 .accept_ra_rtr_pref = 1,
224 .rtr_probe_interval = 60 * HZ,
225 #ifdef CONFIG_IPV6_ROUTE_INFO
226 .accept_ra_rt_info_max_plen = 0,
227 #endif
228 #endif
229 .proxy_ndp = 0,
230 .accept_source_route = 0, /* we do not accept RH0 by default. */
231 .disable_ipv6 = 0,
232 .accept_dad = 1,
233 .suppress_frag_ndisc = 1,
234 .accept_ra_mtu = 1,
235 .stable_secret = {
236 .initialized = false,
237 },
238 .use_oif_addrs_only = 0,
239 .ignore_routes_with_linkdown = 0,
240 .keep_addr_on_down = 0,
241 .seg6_enabled = 0,
242 #ifdef CONFIG_IPV6_SEG6_HMAC
243 .seg6_require_hmac = 0,
244 #endif
245 .enhanced_dad = 1,
246 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
247 };
248
249 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
250 .forwarding = 0,
251 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
252 .mtu6 = IPV6_MIN_MTU,
253 .accept_ra = 1,
254 .accept_redirects = 1,
255 .autoconf = 1,
256 .force_mld_version = 0,
257 .mldv1_unsolicited_report_interval = 10 * HZ,
258 .mldv2_unsolicited_report_interval = HZ,
259 .dad_transmits = 1,
260 .rtr_solicits = MAX_RTR_SOLICITATIONS,
261 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
262 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
263 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
264 .use_tempaddr = 0,
265 .temp_valid_lft = TEMP_VALID_LIFETIME,
266 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
267 .regen_max_retry = REGEN_MAX_RETRY,
268 .max_desync_factor = MAX_DESYNC_FACTOR,
269 .max_addresses = IPV6_MAX_ADDRESSES,
270 .accept_ra_defrtr = 1,
271 .accept_ra_from_local = 0,
272 .accept_ra_min_hop_limit= 1,
273 .accept_ra_pinfo = 1,
274 #ifdef CONFIG_IPV6_ROUTER_PREF
275 .accept_ra_rtr_pref = 1,
276 .rtr_probe_interval = 60 * HZ,
277 #ifdef CONFIG_IPV6_ROUTE_INFO
278 .accept_ra_rt_info_max_plen = 0,
279 #endif
280 #endif
281 .proxy_ndp = 0,
282 .accept_source_route = 0, /* we do not accept RH0 by default. */
283 .disable_ipv6 = 0,
284 .accept_dad = 1,
285 .suppress_frag_ndisc = 1,
286 .accept_ra_mtu = 1,
287 .stable_secret = {
288 .initialized = false,
289 },
290 .use_oif_addrs_only = 0,
291 .ignore_routes_with_linkdown = 0,
292 .keep_addr_on_down = 0,
293 .seg6_enabled = 0,
294 #ifdef CONFIG_IPV6_SEG6_HMAC
295 .seg6_require_hmac = 0,
296 #endif
297 .enhanced_dad = 1,
298 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
299 };
300
301 /* Check if a valid qdisc is available */
302 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
303 {
304 return !qdisc_tx_is_noop(dev);
305 }
306
307 static void addrconf_del_rs_timer(struct inet6_dev *idev)
308 {
309 if (del_timer(&idev->rs_timer))
310 __in6_dev_put(idev);
311 }
312
313 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
314 {
315 if (cancel_delayed_work(&ifp->dad_work))
316 __in6_ifa_put(ifp);
317 }
318
319 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
320 unsigned long when)
321 {
322 if (!timer_pending(&idev->rs_timer))
323 in6_dev_hold(idev);
324 mod_timer(&idev->rs_timer, jiffies + when);
325 }
326
327 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
328 unsigned long delay)
329 {
330 if (!delayed_work_pending(&ifp->dad_work))
331 in6_ifa_hold(ifp);
332 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
333 }
334
335 static int snmp6_alloc_dev(struct inet6_dev *idev)
336 {
337 int i;
338
339 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
340 if (!idev->stats.ipv6)
341 goto err_ip;
342
343 for_each_possible_cpu(i) {
344 struct ipstats_mib *addrconf_stats;
345 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
346 u64_stats_init(&addrconf_stats->syncp);
347 }
348
349
350 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
351 GFP_KERNEL);
352 if (!idev->stats.icmpv6dev)
353 goto err_icmp;
354 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
355 GFP_KERNEL);
356 if (!idev->stats.icmpv6msgdev)
357 goto err_icmpmsg;
358
359 return 0;
360
361 err_icmpmsg:
362 kfree(idev->stats.icmpv6dev);
363 err_icmp:
364 free_percpu(idev->stats.ipv6);
365 err_ip:
366 return -ENOMEM;
367 }
368
369 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
370 {
371 struct inet6_dev *ndev;
372 int err = -ENOMEM;
373
374 ASSERT_RTNL();
375
376 if (dev->mtu < IPV6_MIN_MTU)
377 return ERR_PTR(-EINVAL);
378
379 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
380 if (!ndev)
381 return ERR_PTR(err);
382
383 rwlock_init(&ndev->lock);
384 ndev->dev = dev;
385 INIT_LIST_HEAD(&ndev->addr_list);
386 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
387 (unsigned long)ndev);
388 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
389
390 if (ndev->cnf.stable_secret.initialized)
391 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
392 else
393 ndev->cnf.addr_gen_mode = ipv6_devconf_dflt.addr_gen_mode;
394
395 ndev->cnf.mtu6 = dev->mtu;
396 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
397 if (!ndev->nd_parms) {
398 kfree(ndev);
399 return ERR_PTR(err);
400 }
401 if (ndev->cnf.forwarding)
402 dev_disable_lro(dev);
403 /* We refer to the device */
404 dev_hold(dev);
405
406 if (snmp6_alloc_dev(ndev) < 0) {
407 ADBG(KERN_WARNING
408 "%s: cannot allocate memory for statistics; dev=%s.\n",
409 __func__, dev->name);
410 neigh_parms_release(&nd_tbl, ndev->nd_parms);
411 dev_put(dev);
412 kfree(ndev);
413 return ERR_PTR(err);
414 }
415
416 if (snmp6_register_dev(ndev) < 0) {
417 ADBG(KERN_WARNING
418 "%s: cannot create /proc/net/dev_snmp6/%s\n",
419 __func__, dev->name);
420 goto err_release;
421 }
422
423 /* One reference from device. */
424 in6_dev_hold(ndev);
425
426 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
427 ndev->cnf.accept_dad = -1;
428
429 #if IS_ENABLED(CONFIG_IPV6_SIT)
430 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
431 pr_info("%s: Disabled Multicast RS\n", dev->name);
432 ndev->cnf.rtr_solicits = 0;
433 }
434 #endif
435
436 INIT_LIST_HEAD(&ndev->tempaddr_list);
437 ndev->desync_factor = U32_MAX;
438 if ((dev->flags&IFF_LOOPBACK) ||
439 dev->type == ARPHRD_TUNNEL ||
440 dev->type == ARPHRD_TUNNEL6 ||
441 dev->type == ARPHRD_SIT ||
442 dev->type == ARPHRD_NONE) {
443 ndev->cnf.use_tempaddr = -1;
444 } else
445 ipv6_regen_rndid(ndev);
446
447 ndev->token = in6addr_any;
448
449 if (netif_running(dev) && addrconf_qdisc_ok(dev))
450 ndev->if_flags |= IF_READY;
451
452 ipv6_mc_init_dev(ndev);
453 ndev->tstamp = jiffies;
454 err = addrconf_sysctl_register(ndev);
455 if (err) {
456 ipv6_mc_destroy_dev(ndev);
457 snmp6_unregister_dev(ndev);
458 goto err_release;
459 }
460 /* protected by rtnl_lock */
461 rcu_assign_pointer(dev->ip6_ptr, ndev);
462
463 /* Join interface-local all-node multicast group */
464 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
465
466 /* Join all-node multicast group */
467 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
468
469 /* Join all-router multicast group if forwarding is set */
470 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
471 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
472
473 return ndev;
474
475 err_release:
476 neigh_parms_release(&nd_tbl, ndev->nd_parms);
477 ndev->dead = 1;
478 in6_dev_finish_destroy(ndev);
479 return ERR_PTR(err);
480 }
481
482 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
483 {
484 struct inet6_dev *idev;
485
486 ASSERT_RTNL();
487
488 idev = __in6_dev_get(dev);
489 if (!idev) {
490 idev = ipv6_add_dev(dev);
491 if (IS_ERR(idev))
492 return NULL;
493 }
494
495 if (dev->flags&IFF_UP)
496 ipv6_mc_up(idev);
497 return idev;
498 }
499
500 static int inet6_netconf_msgsize_devconf(int type)
501 {
502 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
503 + nla_total_size(4); /* NETCONFA_IFINDEX */
504 bool all = false;
505
506 if (type == NETCONFA_ALL)
507 all = true;
508
509 if (all || type == NETCONFA_FORWARDING)
510 size += nla_total_size(4);
511 #ifdef CONFIG_IPV6_MROUTE
512 if (all || type == NETCONFA_MC_FORWARDING)
513 size += nla_total_size(4);
514 #endif
515 if (all || type == NETCONFA_PROXY_NEIGH)
516 size += nla_total_size(4);
517
518 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
519 size += nla_total_size(4);
520
521 return size;
522 }
523
524 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
525 struct ipv6_devconf *devconf, u32 portid,
526 u32 seq, int event, unsigned int flags,
527 int type)
528 {
529 struct nlmsghdr *nlh;
530 struct netconfmsg *ncm;
531 bool all = false;
532
533 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
534 flags);
535 if (!nlh)
536 return -EMSGSIZE;
537
538 if (type == NETCONFA_ALL)
539 all = true;
540
541 ncm = nlmsg_data(nlh);
542 ncm->ncm_family = AF_INET6;
543
544 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
545 goto nla_put_failure;
546
547 if ((all || type == NETCONFA_FORWARDING) &&
548 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
549 goto nla_put_failure;
550 #ifdef CONFIG_IPV6_MROUTE
551 if ((all || type == NETCONFA_MC_FORWARDING) &&
552 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
553 devconf->mc_forwarding) < 0)
554 goto nla_put_failure;
555 #endif
556 if ((all || type == NETCONFA_PROXY_NEIGH) &&
557 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
558 goto nla_put_failure;
559
560 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
561 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
562 devconf->ignore_routes_with_linkdown) < 0)
563 goto nla_put_failure;
564
565 nlmsg_end(skb, nlh);
566 return 0;
567
568 nla_put_failure:
569 nlmsg_cancel(skb, nlh);
570 return -EMSGSIZE;
571 }
572
573 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
574 struct ipv6_devconf *devconf)
575 {
576 struct sk_buff *skb;
577 int err = -ENOBUFS;
578
579 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
580 if (!skb)
581 goto errout;
582
583 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
584 RTM_NEWNETCONF, 0, type);
585 if (err < 0) {
586 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
587 WARN_ON(err == -EMSGSIZE);
588 kfree_skb(skb);
589 goto errout;
590 }
591 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
592 return;
593 errout:
594 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
595 }
596
597 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
598 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
599 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
600 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
601 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
602 };
603
604 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
605 struct nlmsghdr *nlh)
606 {
607 struct net *net = sock_net(in_skb->sk);
608 struct nlattr *tb[NETCONFA_MAX+1];
609 struct netconfmsg *ncm;
610 struct sk_buff *skb;
611 struct ipv6_devconf *devconf;
612 struct inet6_dev *in6_dev;
613 struct net_device *dev;
614 int ifindex;
615 int err;
616
617 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
618 devconf_ipv6_policy);
619 if (err < 0)
620 goto errout;
621
622 err = -EINVAL;
623 if (!tb[NETCONFA_IFINDEX])
624 goto errout;
625
626 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
627 switch (ifindex) {
628 case NETCONFA_IFINDEX_ALL:
629 devconf = net->ipv6.devconf_all;
630 break;
631 case NETCONFA_IFINDEX_DEFAULT:
632 devconf = net->ipv6.devconf_dflt;
633 break;
634 default:
635 dev = __dev_get_by_index(net, ifindex);
636 if (!dev)
637 goto errout;
638 in6_dev = __in6_dev_get(dev);
639 if (!in6_dev)
640 goto errout;
641 devconf = &in6_dev->cnf;
642 break;
643 }
644
645 err = -ENOBUFS;
646 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_ATOMIC);
647 if (!skb)
648 goto errout;
649
650 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
651 NETLINK_CB(in_skb).portid,
652 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
653 NETCONFA_ALL);
654 if (err < 0) {
655 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
656 WARN_ON(err == -EMSGSIZE);
657 kfree_skb(skb);
658 goto errout;
659 }
660 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
661 errout:
662 return err;
663 }
664
665 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
666 struct netlink_callback *cb)
667 {
668 struct net *net = sock_net(skb->sk);
669 int h, s_h;
670 int idx, s_idx;
671 struct net_device *dev;
672 struct inet6_dev *idev;
673 struct hlist_head *head;
674
675 s_h = cb->args[0];
676 s_idx = idx = cb->args[1];
677
678 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
679 idx = 0;
680 head = &net->dev_index_head[h];
681 rcu_read_lock();
682 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
683 net->dev_base_seq;
684 hlist_for_each_entry_rcu(dev, head, index_hlist) {
685 if (idx < s_idx)
686 goto cont;
687 idev = __in6_dev_get(dev);
688 if (!idev)
689 goto cont;
690
691 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
692 &idev->cnf,
693 NETLINK_CB(cb->skb).portid,
694 cb->nlh->nlmsg_seq,
695 RTM_NEWNETCONF,
696 NLM_F_MULTI,
697 NETCONFA_ALL) < 0) {
698 rcu_read_unlock();
699 goto done;
700 }
701 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
702 cont:
703 idx++;
704 }
705 rcu_read_unlock();
706 }
707 if (h == NETDEV_HASHENTRIES) {
708 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
709 net->ipv6.devconf_all,
710 NETLINK_CB(cb->skb).portid,
711 cb->nlh->nlmsg_seq,
712 RTM_NEWNETCONF, NLM_F_MULTI,
713 NETCONFA_ALL) < 0)
714 goto done;
715 else
716 h++;
717 }
718 if (h == NETDEV_HASHENTRIES + 1) {
719 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
720 net->ipv6.devconf_dflt,
721 NETLINK_CB(cb->skb).portid,
722 cb->nlh->nlmsg_seq,
723 RTM_NEWNETCONF, NLM_F_MULTI,
724 NETCONFA_ALL) < 0)
725 goto done;
726 else
727 h++;
728 }
729 done:
730 cb->args[0] = h;
731 cb->args[1] = idx;
732
733 return skb->len;
734 }
735
736 #ifdef CONFIG_SYSCTL
737 static void dev_forward_change(struct inet6_dev *idev)
738 {
739 struct net_device *dev;
740 struct inet6_ifaddr *ifa;
741
742 if (!idev)
743 return;
744 dev = idev->dev;
745 if (idev->cnf.forwarding)
746 dev_disable_lro(dev);
747 if (dev->flags & IFF_MULTICAST) {
748 if (idev->cnf.forwarding) {
749 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
750 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
751 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
752 } else {
753 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
754 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
755 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
756 }
757 }
758
759 list_for_each_entry(ifa, &idev->addr_list, if_list) {
760 if (ifa->flags&IFA_F_TENTATIVE)
761 continue;
762 if (idev->cnf.forwarding)
763 addrconf_join_anycast(ifa);
764 else
765 addrconf_leave_anycast(ifa);
766 }
767 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
768 dev->ifindex, &idev->cnf);
769 }
770
771
772 static void addrconf_forward_change(struct net *net, __s32 newf)
773 {
774 struct net_device *dev;
775 struct inet6_dev *idev;
776
777 for_each_netdev(net, dev) {
778 idev = __in6_dev_get(dev);
779 if (idev) {
780 int changed = (!idev->cnf.forwarding) ^ (!newf);
781 idev->cnf.forwarding = newf;
782 if (changed)
783 dev_forward_change(idev);
784 }
785 }
786 }
787
788 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
789 {
790 struct net *net;
791 int old;
792
793 if (!rtnl_trylock())
794 return restart_syscall();
795
796 net = (struct net *)table->extra2;
797 old = *p;
798 *p = newf;
799
800 if (p == &net->ipv6.devconf_dflt->forwarding) {
801 if ((!newf) ^ (!old))
802 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
803 NETCONFA_IFINDEX_DEFAULT,
804 net->ipv6.devconf_dflt);
805 rtnl_unlock();
806 return 0;
807 }
808
809 if (p == &net->ipv6.devconf_all->forwarding) {
810 int old_dflt = net->ipv6.devconf_dflt->forwarding;
811
812 net->ipv6.devconf_dflt->forwarding = newf;
813 if ((!newf) ^ (!old_dflt))
814 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
815 NETCONFA_IFINDEX_DEFAULT,
816 net->ipv6.devconf_dflt);
817
818 addrconf_forward_change(net, newf);
819 if ((!newf) ^ (!old))
820 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
821 NETCONFA_IFINDEX_ALL,
822 net->ipv6.devconf_all);
823 } else if ((!newf) ^ (!old))
824 dev_forward_change((struct inet6_dev *)table->extra1);
825 rtnl_unlock();
826
827 if (newf)
828 rt6_purge_dflt_routers(net);
829 return 1;
830 }
831
832 static void addrconf_linkdown_change(struct net *net, __s32 newf)
833 {
834 struct net_device *dev;
835 struct inet6_dev *idev;
836
837 for_each_netdev(net, dev) {
838 idev = __in6_dev_get(dev);
839 if (idev) {
840 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
841
842 idev->cnf.ignore_routes_with_linkdown = newf;
843 if (changed)
844 inet6_netconf_notify_devconf(dev_net(dev),
845 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
846 dev->ifindex,
847 &idev->cnf);
848 }
849 }
850 }
851
852 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
853 {
854 struct net *net;
855 int old;
856
857 if (!rtnl_trylock())
858 return restart_syscall();
859
860 net = (struct net *)table->extra2;
861 old = *p;
862 *p = newf;
863
864 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
865 if ((!newf) ^ (!old))
866 inet6_netconf_notify_devconf(net,
867 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
868 NETCONFA_IFINDEX_DEFAULT,
869 net->ipv6.devconf_dflt);
870 rtnl_unlock();
871 return 0;
872 }
873
874 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
875 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
876 addrconf_linkdown_change(net, newf);
877 if ((!newf) ^ (!old))
878 inet6_netconf_notify_devconf(net,
879 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
880 NETCONFA_IFINDEX_ALL,
881 net->ipv6.devconf_all);
882 }
883 rtnl_unlock();
884
885 return 1;
886 }
887
888 #endif
889
890 /* Nobody refers to this ifaddr, destroy it */
891 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
892 {
893 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
894
895 #ifdef NET_REFCNT_DEBUG
896 pr_debug("%s\n", __func__);
897 #endif
898
899 in6_dev_put(ifp->idev);
900
901 if (cancel_delayed_work(&ifp->dad_work))
902 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
903 ifp);
904
905 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
906 pr_warn("Freeing alive inet6 address %p\n", ifp);
907 return;
908 }
909 ip6_rt_put(ifp->rt);
910
911 kfree_rcu(ifp, rcu);
912 }
913
914 static void
915 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
916 {
917 struct list_head *p;
918 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
919
920 /*
921 * Each device address list is sorted in order of scope -
922 * global before linklocal.
923 */
924 list_for_each(p, &idev->addr_list) {
925 struct inet6_ifaddr *ifa
926 = list_entry(p, struct inet6_ifaddr, if_list);
927 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
928 break;
929 }
930
931 list_add_tail(&ifp->if_list, p);
932 }
933
934 static u32 inet6_addr_hash(const struct in6_addr *addr)
935 {
936 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
937 }
938
939 /* On success it returns ifp with increased reference count */
940
941 static struct inet6_ifaddr *
942 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
943 const struct in6_addr *peer_addr, int pfxlen,
944 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
945 {
946 struct inet6_ifaddr *ifa = NULL;
947 struct rt6_info *rt;
948 unsigned int hash;
949 int err = 0;
950 int addr_type = ipv6_addr_type(addr);
951
952 if (addr_type == IPV6_ADDR_ANY ||
953 addr_type & IPV6_ADDR_MULTICAST ||
954 (!(idev->dev->flags & IFF_LOOPBACK) &&
955 addr_type & IPV6_ADDR_LOOPBACK))
956 return ERR_PTR(-EADDRNOTAVAIL);
957
958 rcu_read_lock_bh();
959 if (idev->dead) {
960 err = -ENODEV; /*XXX*/
961 goto out2;
962 }
963
964 if (idev->cnf.disable_ipv6) {
965 err = -EACCES;
966 goto out2;
967 }
968
969 spin_lock(&addrconf_hash_lock);
970
971 /* Ignore adding duplicate addresses on an interface */
972 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
973 ADBG("ipv6_add_addr: already assigned\n");
974 err = -EEXIST;
975 goto out;
976 }
977
978 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
979
980 if (!ifa) {
981 ADBG("ipv6_add_addr: malloc failed\n");
982 err = -ENOBUFS;
983 goto out;
984 }
985
986 rt = addrconf_dst_alloc(idev, addr, false);
987 if (IS_ERR(rt)) {
988 err = PTR_ERR(rt);
989 goto out;
990 }
991
992 neigh_parms_data_state_setall(idev->nd_parms);
993
994 ifa->addr = *addr;
995 if (peer_addr)
996 ifa->peer_addr = *peer_addr;
997
998 spin_lock_init(&ifa->lock);
999 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1000 INIT_HLIST_NODE(&ifa->addr_lst);
1001 ifa->scope = scope;
1002 ifa->prefix_len = pfxlen;
1003 ifa->flags = flags | IFA_F_TENTATIVE;
1004 ifa->valid_lft = valid_lft;
1005 ifa->prefered_lft = prefered_lft;
1006 ifa->cstamp = ifa->tstamp = jiffies;
1007 ifa->tokenized = false;
1008
1009 ifa->rt = rt;
1010
1011 ifa->idev = idev;
1012 in6_dev_hold(idev);
1013 /* For caller */
1014 in6_ifa_hold(ifa);
1015
1016 /* Add to big hash table */
1017 hash = inet6_addr_hash(addr);
1018
1019 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1020 spin_unlock(&addrconf_hash_lock);
1021
1022 write_lock(&idev->lock);
1023 /* Add to inet6_dev unicast addr list. */
1024 ipv6_link_dev_addr(idev, ifa);
1025
1026 if (ifa->flags&IFA_F_TEMPORARY) {
1027 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1028 in6_ifa_hold(ifa);
1029 }
1030
1031 in6_ifa_hold(ifa);
1032 write_unlock(&idev->lock);
1033 out2:
1034 rcu_read_unlock_bh();
1035
1036 if (likely(err == 0))
1037 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1038 else {
1039 kfree(ifa);
1040 ifa = ERR_PTR(err);
1041 }
1042
1043 return ifa;
1044 out:
1045 spin_unlock(&addrconf_hash_lock);
1046 goto out2;
1047 }
1048
1049 enum cleanup_prefix_rt_t {
1050 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1051 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1052 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1053 };
1054
1055 /*
1056 * Check, whether the prefix for ifp would still need a prefix route
1057 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1058 * constants.
1059 *
1060 * 1) we don't purge prefix if address was not permanent.
1061 * prefix is managed by its own lifetime.
1062 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1063 * 3) if there are no addresses, delete prefix.
1064 * 4) if there are still other permanent address(es),
1065 * corresponding prefix is still permanent.
1066 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1067 * don't purge the prefix, assume user space is managing it.
1068 * 6) otherwise, update prefix lifetime to the
1069 * longest valid lifetime among the corresponding
1070 * addresses on the device.
1071 * Note: subsequent RA will update lifetime.
1072 **/
1073 static enum cleanup_prefix_rt_t
1074 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1075 {
1076 struct inet6_ifaddr *ifa;
1077 struct inet6_dev *idev = ifp->idev;
1078 unsigned long lifetime;
1079 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1080
1081 *expires = jiffies;
1082
1083 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1084 if (ifa == ifp)
1085 continue;
1086 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1087 ifp->prefix_len))
1088 continue;
1089 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1090 return CLEANUP_PREFIX_RT_NOP;
1091
1092 action = CLEANUP_PREFIX_RT_EXPIRE;
1093
1094 spin_lock(&ifa->lock);
1095
1096 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1097 /*
1098 * Note: Because this address is
1099 * not permanent, lifetime <
1100 * LONG_MAX / HZ here.
1101 */
1102 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1103 *expires = ifa->tstamp + lifetime * HZ;
1104 spin_unlock(&ifa->lock);
1105 }
1106
1107 return action;
1108 }
1109
1110 static void
1111 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1112 {
1113 struct rt6_info *rt;
1114
1115 rt = addrconf_get_prefix_route(&ifp->addr,
1116 ifp->prefix_len,
1117 ifp->idev->dev,
1118 0, RTF_GATEWAY | RTF_DEFAULT);
1119 if (rt) {
1120 if (del_rt)
1121 ip6_del_rt(rt);
1122 else {
1123 if (!(rt->rt6i_flags & RTF_EXPIRES))
1124 rt6_set_expires(rt, expires);
1125 ip6_rt_put(rt);
1126 }
1127 }
1128 }
1129
1130
1131 /* This function wants to get referenced ifp and releases it before return */
1132
1133 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1134 {
1135 int state;
1136 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1137 unsigned long expires;
1138
1139 ASSERT_RTNL();
1140
1141 spin_lock_bh(&ifp->lock);
1142 state = ifp->state;
1143 ifp->state = INET6_IFADDR_STATE_DEAD;
1144 spin_unlock_bh(&ifp->lock);
1145
1146 if (state == INET6_IFADDR_STATE_DEAD)
1147 goto out;
1148
1149 spin_lock_bh(&addrconf_hash_lock);
1150 hlist_del_init_rcu(&ifp->addr_lst);
1151 spin_unlock_bh(&addrconf_hash_lock);
1152
1153 write_lock_bh(&ifp->idev->lock);
1154
1155 if (ifp->flags&IFA_F_TEMPORARY) {
1156 list_del(&ifp->tmp_list);
1157 if (ifp->ifpub) {
1158 in6_ifa_put(ifp->ifpub);
1159 ifp->ifpub = NULL;
1160 }
1161 __in6_ifa_put(ifp);
1162 }
1163
1164 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1165 action = check_cleanup_prefix_route(ifp, &expires);
1166
1167 list_del_init(&ifp->if_list);
1168 __in6_ifa_put(ifp);
1169
1170 write_unlock_bh(&ifp->idev->lock);
1171
1172 addrconf_del_dad_work(ifp);
1173
1174 ipv6_ifa_notify(RTM_DELADDR, ifp);
1175
1176 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1177
1178 if (action != CLEANUP_PREFIX_RT_NOP) {
1179 cleanup_prefix_route(ifp, expires,
1180 action == CLEANUP_PREFIX_RT_DEL);
1181 }
1182
1183 /* clean up prefsrc entries */
1184 rt6_remove_prefsrc(ifp);
1185 out:
1186 in6_ifa_put(ifp);
1187 }
1188
1189 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1190 {
1191 struct inet6_dev *idev = ifp->idev;
1192 struct in6_addr addr, *tmpaddr;
1193 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1194 unsigned long regen_advance;
1195 int tmp_plen;
1196 int ret = 0;
1197 u32 addr_flags;
1198 unsigned long now = jiffies;
1199 long max_desync_factor;
1200 s32 cnf_temp_preferred_lft;
1201
1202 write_lock_bh(&idev->lock);
1203 if (ift) {
1204 spin_lock_bh(&ift->lock);
1205 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1206 spin_unlock_bh(&ift->lock);
1207 tmpaddr = &addr;
1208 } else {
1209 tmpaddr = NULL;
1210 }
1211 retry:
1212 in6_dev_hold(idev);
1213 if (idev->cnf.use_tempaddr <= 0) {
1214 write_unlock_bh(&idev->lock);
1215 pr_info("%s: use_tempaddr is disabled\n", __func__);
1216 in6_dev_put(idev);
1217 ret = -1;
1218 goto out;
1219 }
1220 spin_lock_bh(&ifp->lock);
1221 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1222 idev->cnf.use_tempaddr = -1; /*XXX*/
1223 spin_unlock_bh(&ifp->lock);
1224 write_unlock_bh(&idev->lock);
1225 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1226 __func__);
1227 in6_dev_put(idev);
1228 ret = -1;
1229 goto out;
1230 }
1231 in6_ifa_hold(ifp);
1232 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1233 ipv6_try_regen_rndid(idev, tmpaddr);
1234 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1235 age = (now - ifp->tstamp) / HZ;
1236
1237 regen_advance = idev->cnf.regen_max_retry *
1238 idev->cnf.dad_transmits *
1239 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1240
1241 /* recalculate max_desync_factor each time and update
1242 * idev->desync_factor if it's larger
1243 */
1244 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1245 max_desync_factor = min_t(__u32,
1246 idev->cnf.max_desync_factor,
1247 cnf_temp_preferred_lft - regen_advance);
1248
1249 if (unlikely(idev->desync_factor > max_desync_factor)) {
1250 if (max_desync_factor > 0) {
1251 get_random_bytes(&idev->desync_factor,
1252 sizeof(idev->desync_factor));
1253 idev->desync_factor %= max_desync_factor;
1254 } else {
1255 idev->desync_factor = 0;
1256 }
1257 }
1258
1259 tmp_valid_lft = min_t(__u32,
1260 ifp->valid_lft,
1261 idev->cnf.temp_valid_lft + age);
1262 tmp_prefered_lft = cnf_temp_preferred_lft + age -
1263 idev->desync_factor;
1264 tmp_prefered_lft = min_t(__u32, ifp->prefered_lft, tmp_prefered_lft);
1265 tmp_plen = ifp->prefix_len;
1266 tmp_tstamp = ifp->tstamp;
1267 spin_unlock_bh(&ifp->lock);
1268
1269 write_unlock_bh(&idev->lock);
1270
1271 /* A temporary address is created only if this calculated Preferred
1272 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1273 * an implementation must not create a temporary address with a zero
1274 * Preferred Lifetime.
1275 * Use age calculation as in addrconf_verify to avoid unnecessary
1276 * temporary addresses being generated.
1277 */
1278 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1279 if (tmp_prefered_lft <= regen_advance + age) {
1280 in6_ifa_put(ifp);
1281 in6_dev_put(idev);
1282 ret = -1;
1283 goto out;
1284 }
1285
1286 addr_flags = IFA_F_TEMPORARY;
1287 /* set in addrconf_prefix_rcv() */
1288 if (ifp->flags & IFA_F_OPTIMISTIC)
1289 addr_flags |= IFA_F_OPTIMISTIC;
1290
1291 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1292 ipv6_addr_scope(&addr), addr_flags,
1293 tmp_valid_lft, tmp_prefered_lft);
1294 if (IS_ERR(ift)) {
1295 in6_ifa_put(ifp);
1296 in6_dev_put(idev);
1297 pr_info("%s: retry temporary address regeneration\n", __func__);
1298 tmpaddr = &addr;
1299 write_lock_bh(&idev->lock);
1300 goto retry;
1301 }
1302
1303 spin_lock_bh(&ift->lock);
1304 ift->ifpub = ifp;
1305 ift->cstamp = now;
1306 ift->tstamp = tmp_tstamp;
1307 spin_unlock_bh(&ift->lock);
1308
1309 addrconf_dad_start(ift);
1310 in6_ifa_put(ift);
1311 in6_dev_put(idev);
1312 out:
1313 return ret;
1314 }
1315
1316 /*
1317 * Choose an appropriate source address (RFC3484)
1318 */
1319 enum {
1320 IPV6_SADDR_RULE_INIT = 0,
1321 IPV6_SADDR_RULE_LOCAL,
1322 IPV6_SADDR_RULE_SCOPE,
1323 IPV6_SADDR_RULE_PREFERRED,
1324 #ifdef CONFIG_IPV6_MIP6
1325 IPV6_SADDR_RULE_HOA,
1326 #endif
1327 IPV6_SADDR_RULE_OIF,
1328 IPV6_SADDR_RULE_LABEL,
1329 IPV6_SADDR_RULE_PRIVACY,
1330 IPV6_SADDR_RULE_ORCHID,
1331 IPV6_SADDR_RULE_PREFIX,
1332 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1333 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1334 #endif
1335 IPV6_SADDR_RULE_MAX
1336 };
1337
1338 struct ipv6_saddr_score {
1339 int rule;
1340 int addr_type;
1341 struct inet6_ifaddr *ifa;
1342 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1343 int scopedist;
1344 int matchlen;
1345 };
1346
1347 struct ipv6_saddr_dst {
1348 const struct in6_addr *addr;
1349 int ifindex;
1350 int scope;
1351 int label;
1352 unsigned int prefs;
1353 };
1354
1355 static inline int ipv6_saddr_preferred(int type)
1356 {
1357 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1358 return 1;
1359 return 0;
1360 }
1361
1362 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1363 {
1364 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1365 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1366 #else
1367 return false;
1368 #endif
1369 }
1370
1371 static int ipv6_get_saddr_eval(struct net *net,
1372 struct ipv6_saddr_score *score,
1373 struct ipv6_saddr_dst *dst,
1374 int i)
1375 {
1376 int ret;
1377
1378 if (i <= score->rule) {
1379 switch (i) {
1380 case IPV6_SADDR_RULE_SCOPE:
1381 ret = score->scopedist;
1382 break;
1383 case IPV6_SADDR_RULE_PREFIX:
1384 ret = score->matchlen;
1385 break;
1386 default:
1387 ret = !!test_bit(i, score->scorebits);
1388 }
1389 goto out;
1390 }
1391
1392 switch (i) {
1393 case IPV6_SADDR_RULE_INIT:
1394 /* Rule 0: remember if hiscore is not ready yet */
1395 ret = !!score->ifa;
1396 break;
1397 case IPV6_SADDR_RULE_LOCAL:
1398 /* Rule 1: Prefer same address */
1399 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1400 break;
1401 case IPV6_SADDR_RULE_SCOPE:
1402 /* Rule 2: Prefer appropriate scope
1403 *
1404 * ret
1405 * ^
1406 * -1 | d 15
1407 * ---+--+-+---> scope
1408 * |
1409 * | d is scope of the destination.
1410 * B-d | \
1411 * | \ <- smaller scope is better if
1412 * B-15 | \ if scope is enough for destination.
1413 * | ret = B - scope (-1 <= scope >= d <= 15).
1414 * d-C-1 | /
1415 * |/ <- greater is better
1416 * -C / if scope is not enough for destination.
1417 * /| ret = scope - C (-1 <= d < scope <= 15).
1418 *
1419 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1420 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1421 * Assume B = 0 and we get C > 29.
1422 */
1423 ret = __ipv6_addr_src_scope(score->addr_type);
1424 if (ret >= dst->scope)
1425 ret = -ret;
1426 else
1427 ret -= 128; /* 30 is enough */
1428 score->scopedist = ret;
1429 break;
1430 case IPV6_SADDR_RULE_PREFERRED:
1431 {
1432 /* Rule 3: Avoid deprecated and optimistic addresses */
1433 u8 avoid = IFA_F_DEPRECATED;
1434
1435 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1436 avoid |= IFA_F_OPTIMISTIC;
1437 ret = ipv6_saddr_preferred(score->addr_type) ||
1438 !(score->ifa->flags & avoid);
1439 break;
1440 }
1441 #ifdef CONFIG_IPV6_MIP6
1442 case IPV6_SADDR_RULE_HOA:
1443 {
1444 /* Rule 4: Prefer home address */
1445 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1446 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1447 break;
1448 }
1449 #endif
1450 case IPV6_SADDR_RULE_OIF:
1451 /* Rule 5: Prefer outgoing interface */
1452 ret = (!dst->ifindex ||
1453 dst->ifindex == score->ifa->idev->dev->ifindex);
1454 break;
1455 case IPV6_SADDR_RULE_LABEL:
1456 /* Rule 6: Prefer matching label */
1457 ret = ipv6_addr_label(net,
1458 &score->ifa->addr, score->addr_type,
1459 score->ifa->idev->dev->ifindex) == dst->label;
1460 break;
1461 case IPV6_SADDR_RULE_PRIVACY:
1462 {
1463 /* Rule 7: Prefer public address
1464 * Note: prefer temporary address if use_tempaddr >= 2
1465 */
1466 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1467 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1468 score->ifa->idev->cnf.use_tempaddr >= 2;
1469 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1470 break;
1471 }
1472 case IPV6_SADDR_RULE_ORCHID:
1473 /* Rule 8-: Prefer ORCHID vs ORCHID or
1474 * non-ORCHID vs non-ORCHID
1475 */
1476 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1477 ipv6_addr_orchid(dst->addr));
1478 break;
1479 case IPV6_SADDR_RULE_PREFIX:
1480 /* Rule 8: Use longest matching prefix */
1481 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1482 if (ret > score->ifa->prefix_len)
1483 ret = score->ifa->prefix_len;
1484 score->matchlen = ret;
1485 break;
1486 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1487 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1488 /* Optimistic addresses still have lower precedence than other
1489 * preferred addresses.
1490 */
1491 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1492 break;
1493 #endif
1494 default:
1495 ret = 0;
1496 }
1497
1498 if (ret)
1499 __set_bit(i, score->scorebits);
1500 score->rule = i;
1501 out:
1502 return ret;
1503 }
1504
1505 static int __ipv6_dev_get_saddr(struct net *net,
1506 struct ipv6_saddr_dst *dst,
1507 struct inet6_dev *idev,
1508 struct ipv6_saddr_score *scores,
1509 int hiscore_idx)
1510 {
1511 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1512
1513 read_lock_bh(&idev->lock);
1514 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1515 int i;
1516
1517 /*
1518 * - Tentative Address (RFC2462 section 5.4)
1519 * - A tentative address is not considered
1520 * "assigned to an interface" in the traditional
1521 * sense, unless it is also flagged as optimistic.
1522 * - Candidate Source Address (section 4)
1523 * - In any case, anycast addresses, multicast
1524 * addresses, and the unspecified address MUST
1525 * NOT be included in a candidate set.
1526 */
1527 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1528 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1529 continue;
1530
1531 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1532
1533 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1534 score->addr_type & IPV6_ADDR_MULTICAST)) {
1535 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1536 idev->dev->name);
1537 continue;
1538 }
1539
1540 score->rule = -1;
1541 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1542
1543 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1544 int minihiscore, miniscore;
1545
1546 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1547 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1548
1549 if (minihiscore > miniscore) {
1550 if (i == IPV6_SADDR_RULE_SCOPE &&
1551 score->scopedist > 0) {
1552 /*
1553 * special case:
1554 * each remaining entry
1555 * has too small (not enough)
1556 * scope, because ifa entries
1557 * are sorted by their scope
1558 * values.
1559 */
1560 goto out;
1561 }
1562 break;
1563 } else if (minihiscore < miniscore) {
1564 if (hiscore->ifa)
1565 in6_ifa_put(hiscore->ifa);
1566
1567 in6_ifa_hold(score->ifa);
1568
1569 swap(hiscore, score);
1570 hiscore_idx = 1 - hiscore_idx;
1571
1572 /* restore our iterator */
1573 score->ifa = hiscore->ifa;
1574
1575 break;
1576 }
1577 }
1578 }
1579 out:
1580 read_unlock_bh(&idev->lock);
1581 return hiscore_idx;
1582 }
1583
1584 static int ipv6_get_saddr_master(struct net *net,
1585 const struct net_device *dst_dev,
1586 const struct net_device *master,
1587 struct ipv6_saddr_dst *dst,
1588 struct ipv6_saddr_score *scores,
1589 int hiscore_idx)
1590 {
1591 struct inet6_dev *idev;
1592
1593 idev = __in6_dev_get(dst_dev);
1594 if (idev)
1595 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1596 scores, hiscore_idx);
1597
1598 idev = __in6_dev_get(master);
1599 if (idev)
1600 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1601 scores, hiscore_idx);
1602
1603 return hiscore_idx;
1604 }
1605
1606 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1607 const struct in6_addr *daddr, unsigned int prefs,
1608 struct in6_addr *saddr)
1609 {
1610 struct ipv6_saddr_score scores[2], *hiscore;
1611 struct ipv6_saddr_dst dst;
1612 struct inet6_dev *idev;
1613 struct net_device *dev;
1614 int dst_type;
1615 bool use_oif_addr = false;
1616 int hiscore_idx = 0;
1617
1618 dst_type = __ipv6_addr_type(daddr);
1619 dst.addr = daddr;
1620 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1621 dst.scope = __ipv6_addr_src_scope(dst_type);
1622 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1623 dst.prefs = prefs;
1624
1625 scores[hiscore_idx].rule = -1;
1626 scores[hiscore_idx].ifa = NULL;
1627
1628 rcu_read_lock();
1629
1630 /* Candidate Source Address (section 4)
1631 * - multicast and link-local destination address,
1632 * the set of candidate source address MUST only
1633 * include addresses assigned to interfaces
1634 * belonging to the same link as the outgoing
1635 * interface.
1636 * (- For site-local destination addresses, the
1637 * set of candidate source addresses MUST only
1638 * include addresses assigned to interfaces
1639 * belonging to the same site as the outgoing
1640 * interface.)
1641 * - "It is RECOMMENDED that the candidate source addresses
1642 * be the set of unicast addresses assigned to the
1643 * interface that will be used to send to the destination
1644 * (the 'outgoing' interface)." (RFC 6724)
1645 */
1646 if (dst_dev) {
1647 idev = __in6_dev_get(dst_dev);
1648 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1649 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1650 (idev && idev->cnf.use_oif_addrs_only)) {
1651 use_oif_addr = true;
1652 }
1653 }
1654
1655 if (use_oif_addr) {
1656 if (idev)
1657 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1658 } else {
1659 const struct net_device *master;
1660 int master_idx = 0;
1661
1662 /* if dst_dev exists and is enslaved to an L3 device, then
1663 * prefer addresses from dst_dev and then the master over
1664 * any other enslaved devices in the L3 domain.
1665 */
1666 master = l3mdev_master_dev_rcu(dst_dev);
1667 if (master) {
1668 master_idx = master->ifindex;
1669
1670 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1671 master, &dst,
1672 scores, hiscore_idx);
1673
1674 if (scores[hiscore_idx].ifa)
1675 goto out;
1676 }
1677
1678 for_each_netdev_rcu(net, dev) {
1679 /* only consider addresses on devices in the
1680 * same L3 domain
1681 */
1682 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1683 continue;
1684 idev = __in6_dev_get(dev);
1685 if (!idev)
1686 continue;
1687 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1688 }
1689 }
1690
1691 out:
1692 rcu_read_unlock();
1693
1694 hiscore = &scores[hiscore_idx];
1695 if (!hiscore->ifa)
1696 return -EADDRNOTAVAIL;
1697
1698 *saddr = hiscore->ifa->addr;
1699 in6_ifa_put(hiscore->ifa);
1700 return 0;
1701 }
1702 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1703
1704 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1705 u32 banned_flags)
1706 {
1707 struct inet6_ifaddr *ifp;
1708 int err = -EADDRNOTAVAIL;
1709
1710 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1711 if (ifp->scope > IFA_LINK)
1712 break;
1713 if (ifp->scope == IFA_LINK &&
1714 !(ifp->flags & banned_flags)) {
1715 *addr = ifp->addr;
1716 err = 0;
1717 break;
1718 }
1719 }
1720 return err;
1721 }
1722
1723 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1724 u32 banned_flags)
1725 {
1726 struct inet6_dev *idev;
1727 int err = -EADDRNOTAVAIL;
1728
1729 rcu_read_lock();
1730 idev = __in6_dev_get(dev);
1731 if (idev) {
1732 read_lock_bh(&idev->lock);
1733 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1734 read_unlock_bh(&idev->lock);
1735 }
1736 rcu_read_unlock();
1737 return err;
1738 }
1739
1740 static int ipv6_count_addresses(struct inet6_dev *idev)
1741 {
1742 int cnt = 0;
1743 struct inet6_ifaddr *ifp;
1744
1745 read_lock_bh(&idev->lock);
1746 list_for_each_entry(ifp, &idev->addr_list, if_list)
1747 cnt++;
1748 read_unlock_bh(&idev->lock);
1749 return cnt;
1750 }
1751
1752 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1753 const struct net_device *dev, int strict)
1754 {
1755 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1756 }
1757 EXPORT_SYMBOL(ipv6_chk_addr);
1758
1759 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1760 const struct net_device *dev, int strict,
1761 u32 banned_flags)
1762 {
1763 struct inet6_ifaddr *ifp;
1764 unsigned int hash = inet6_addr_hash(addr);
1765 u32 ifp_flags;
1766
1767 rcu_read_lock_bh();
1768 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1769 if (!net_eq(dev_net(ifp->idev->dev), net))
1770 continue;
1771 /* Decouple optimistic from tentative for evaluation here.
1772 * Ban optimistic addresses explicitly, when required.
1773 */
1774 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1775 ? (ifp->flags&~IFA_F_TENTATIVE)
1776 : ifp->flags;
1777 if (ipv6_addr_equal(&ifp->addr, addr) &&
1778 !(ifp_flags&banned_flags) &&
1779 (!dev || ifp->idev->dev == dev ||
1780 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1781 rcu_read_unlock_bh();
1782 return 1;
1783 }
1784 }
1785
1786 rcu_read_unlock_bh();
1787 return 0;
1788 }
1789 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1790
1791 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1792 struct net_device *dev)
1793 {
1794 unsigned int hash = inet6_addr_hash(addr);
1795 struct inet6_ifaddr *ifp;
1796
1797 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1798 if (!net_eq(dev_net(ifp->idev->dev), net))
1799 continue;
1800 if (ipv6_addr_equal(&ifp->addr, addr)) {
1801 if (!dev || ifp->idev->dev == dev)
1802 return true;
1803 }
1804 }
1805 return false;
1806 }
1807
1808 /* Compares an address/prefix_len with addresses on device @dev.
1809 * If one is found it returns true.
1810 */
1811 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1812 const unsigned int prefix_len, struct net_device *dev)
1813 {
1814 struct inet6_dev *idev;
1815 struct inet6_ifaddr *ifa;
1816 bool ret = false;
1817
1818 rcu_read_lock();
1819 idev = __in6_dev_get(dev);
1820 if (idev) {
1821 read_lock_bh(&idev->lock);
1822 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1823 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1824 if (ret)
1825 break;
1826 }
1827 read_unlock_bh(&idev->lock);
1828 }
1829 rcu_read_unlock();
1830
1831 return ret;
1832 }
1833 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1834
1835 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1836 {
1837 struct inet6_dev *idev;
1838 struct inet6_ifaddr *ifa;
1839 int onlink;
1840
1841 onlink = 0;
1842 rcu_read_lock();
1843 idev = __in6_dev_get(dev);
1844 if (idev) {
1845 read_lock_bh(&idev->lock);
1846 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1847 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1848 ifa->prefix_len);
1849 if (onlink)
1850 break;
1851 }
1852 read_unlock_bh(&idev->lock);
1853 }
1854 rcu_read_unlock();
1855 return onlink;
1856 }
1857 EXPORT_SYMBOL(ipv6_chk_prefix);
1858
1859 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1860 struct net_device *dev, int strict)
1861 {
1862 struct inet6_ifaddr *ifp, *result = NULL;
1863 unsigned int hash = inet6_addr_hash(addr);
1864
1865 rcu_read_lock_bh();
1866 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1867 if (!net_eq(dev_net(ifp->idev->dev), net))
1868 continue;
1869 if (ipv6_addr_equal(&ifp->addr, addr)) {
1870 if (!dev || ifp->idev->dev == dev ||
1871 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1872 result = ifp;
1873 in6_ifa_hold(ifp);
1874 break;
1875 }
1876 }
1877 }
1878 rcu_read_unlock_bh();
1879
1880 return result;
1881 }
1882
1883 /* Gets referenced address, destroys ifaddr */
1884
1885 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1886 {
1887 if (dad_failed)
1888 ifp->flags |= IFA_F_DADFAILED;
1889
1890 if (ifp->flags&IFA_F_PERMANENT) {
1891 spin_lock_bh(&ifp->lock);
1892 addrconf_del_dad_work(ifp);
1893 ifp->flags |= IFA_F_TENTATIVE;
1894 spin_unlock_bh(&ifp->lock);
1895 if (dad_failed)
1896 ipv6_ifa_notify(0, ifp);
1897 in6_ifa_put(ifp);
1898 } else if (ifp->flags&IFA_F_TEMPORARY) {
1899 struct inet6_ifaddr *ifpub;
1900 spin_lock_bh(&ifp->lock);
1901 ifpub = ifp->ifpub;
1902 if (ifpub) {
1903 in6_ifa_hold(ifpub);
1904 spin_unlock_bh(&ifp->lock);
1905 ipv6_create_tempaddr(ifpub, ifp);
1906 in6_ifa_put(ifpub);
1907 } else {
1908 spin_unlock_bh(&ifp->lock);
1909 }
1910 ipv6_del_addr(ifp);
1911 } else {
1912 ipv6_del_addr(ifp);
1913 }
1914 }
1915
1916 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1917 {
1918 int err = -ENOENT;
1919
1920 spin_lock_bh(&ifp->lock);
1921 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1922 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1923 err = 0;
1924 }
1925 spin_unlock_bh(&ifp->lock);
1926
1927 return err;
1928 }
1929
1930 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1931 {
1932 struct inet6_dev *idev = ifp->idev;
1933 struct net *net = dev_net(ifp->idev->dev);
1934
1935 if (addrconf_dad_end(ifp)) {
1936 in6_ifa_put(ifp);
1937 return;
1938 }
1939
1940 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1941 ifp->idev->dev->name, &ifp->addr);
1942
1943 spin_lock_bh(&ifp->lock);
1944
1945 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1946 int scope = ifp->scope;
1947 u32 flags = ifp->flags;
1948 struct in6_addr new_addr;
1949 struct inet6_ifaddr *ifp2;
1950 u32 valid_lft, preferred_lft;
1951 int pfxlen = ifp->prefix_len;
1952 int retries = ifp->stable_privacy_retry + 1;
1953
1954 if (retries > net->ipv6.sysctl.idgen_retries) {
1955 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1956 ifp->idev->dev->name);
1957 goto errdad;
1958 }
1959
1960 new_addr = ifp->addr;
1961 if (ipv6_generate_stable_address(&new_addr, retries,
1962 idev))
1963 goto errdad;
1964
1965 valid_lft = ifp->valid_lft;
1966 preferred_lft = ifp->prefered_lft;
1967
1968 spin_unlock_bh(&ifp->lock);
1969
1970 if (idev->cnf.max_addresses &&
1971 ipv6_count_addresses(idev) >=
1972 idev->cnf.max_addresses)
1973 goto lock_errdad;
1974
1975 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1976 ifp->idev->dev->name);
1977
1978 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1979 scope, flags, valid_lft,
1980 preferred_lft);
1981 if (IS_ERR(ifp2))
1982 goto lock_errdad;
1983
1984 spin_lock_bh(&ifp2->lock);
1985 ifp2->stable_privacy_retry = retries;
1986 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1987 spin_unlock_bh(&ifp2->lock);
1988
1989 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1990 in6_ifa_put(ifp2);
1991 lock_errdad:
1992 spin_lock_bh(&ifp->lock);
1993 }
1994
1995 errdad:
1996 /* transition from _POSTDAD to _ERRDAD */
1997 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1998 spin_unlock_bh(&ifp->lock);
1999
2000 addrconf_mod_dad_work(ifp, 0);
2001 in6_ifa_put(ifp);
2002 }
2003
2004 /* Join to solicited addr multicast group.
2005 * caller must hold RTNL */
2006 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2007 {
2008 struct in6_addr maddr;
2009
2010 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2011 return;
2012
2013 addrconf_addr_solict_mult(addr, &maddr);
2014 ipv6_dev_mc_inc(dev, &maddr);
2015 }
2016
2017 /* caller must hold RTNL */
2018 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2019 {
2020 struct in6_addr maddr;
2021
2022 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2023 return;
2024
2025 addrconf_addr_solict_mult(addr, &maddr);
2026 __ipv6_dev_mc_dec(idev, &maddr);
2027 }
2028
2029 /* caller must hold RTNL */
2030 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2031 {
2032 struct in6_addr addr;
2033
2034 if (ifp->prefix_len >= 127) /* RFC 6164 */
2035 return;
2036 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2037 if (ipv6_addr_any(&addr))
2038 return;
2039 __ipv6_dev_ac_inc(ifp->idev, &addr);
2040 }
2041
2042 /* caller must hold RTNL */
2043 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2044 {
2045 struct in6_addr addr;
2046
2047 if (ifp->prefix_len >= 127) /* RFC 6164 */
2048 return;
2049 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2050 if (ipv6_addr_any(&addr))
2051 return;
2052 __ipv6_dev_ac_dec(ifp->idev, &addr);
2053 }
2054
2055 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
2056 {
2057 if (dev->addr_len != EUI64_ADDR_LEN)
2058 return -1;
2059 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2060 eui[0] ^= 2;
2061 return 0;
2062 }
2063
2064 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2065 {
2066 union fwnet_hwaddr *ha;
2067
2068 if (dev->addr_len != FWNET_ALEN)
2069 return -1;
2070
2071 ha = (union fwnet_hwaddr *)dev->dev_addr;
2072
2073 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2074 eui[0] ^= 2;
2075 return 0;
2076 }
2077
2078 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2079 {
2080 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2081 if (dev->addr_len != ARCNET_ALEN)
2082 return -1;
2083 memset(eui, 0, 7);
2084 eui[7] = *(u8 *)dev->dev_addr;
2085 return 0;
2086 }
2087
2088 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2089 {
2090 if (dev->addr_len != INFINIBAND_ALEN)
2091 return -1;
2092 memcpy(eui, dev->dev_addr + 12, 8);
2093 eui[0] |= 2;
2094 return 0;
2095 }
2096
2097 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2098 {
2099 if (addr == 0)
2100 return -1;
2101 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2102 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2103 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2104 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2105 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2106 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2107 eui[1] = 0;
2108 eui[2] = 0x5E;
2109 eui[3] = 0xFE;
2110 memcpy(eui + 4, &addr, 4);
2111 return 0;
2112 }
2113
2114 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2115 {
2116 if (dev->priv_flags & IFF_ISATAP)
2117 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2118 return -1;
2119 }
2120
2121 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2122 {
2123 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2124 }
2125
2126 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2127 {
2128 memcpy(eui, dev->perm_addr, 3);
2129 memcpy(eui + 5, dev->perm_addr + 3, 3);
2130 eui[3] = 0xFF;
2131 eui[4] = 0xFE;
2132 eui[0] ^= 2;
2133 return 0;
2134 }
2135
2136 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2137 {
2138 switch (dev->type) {
2139 case ARPHRD_ETHER:
2140 case ARPHRD_FDDI:
2141 return addrconf_ifid_eui48(eui, dev);
2142 case ARPHRD_ARCNET:
2143 return addrconf_ifid_arcnet(eui, dev);
2144 case ARPHRD_INFINIBAND:
2145 return addrconf_ifid_infiniband(eui, dev);
2146 case ARPHRD_SIT:
2147 return addrconf_ifid_sit(eui, dev);
2148 case ARPHRD_IPGRE:
2149 case ARPHRD_TUNNEL:
2150 return addrconf_ifid_gre(eui, dev);
2151 case ARPHRD_6LOWPAN:
2152 return addrconf_ifid_eui64(eui, dev);
2153 case ARPHRD_IEEE1394:
2154 return addrconf_ifid_ieee1394(eui, dev);
2155 case ARPHRD_TUNNEL6:
2156 case ARPHRD_IP6GRE:
2157 return addrconf_ifid_ip6tnl(eui, dev);
2158 }
2159 return -1;
2160 }
2161
2162 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2163 {
2164 int err = -1;
2165 struct inet6_ifaddr *ifp;
2166
2167 read_lock_bh(&idev->lock);
2168 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2169 if (ifp->scope > IFA_LINK)
2170 break;
2171 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2172 memcpy(eui, ifp->addr.s6_addr+8, 8);
2173 err = 0;
2174 break;
2175 }
2176 }
2177 read_unlock_bh(&idev->lock);
2178 return err;
2179 }
2180
2181 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2182 static void ipv6_regen_rndid(struct inet6_dev *idev)
2183 {
2184 regen:
2185 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2186 idev->rndid[0] &= ~0x02;
2187
2188 /*
2189 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2190 * check if generated address is not inappropriate
2191 *
2192 * - Reserved subnet anycast (RFC 2526)
2193 * 11111101 11....11 1xxxxxxx
2194 * - ISATAP (RFC4214) 6.1
2195 * 00-00-5E-FE-xx-xx-xx-xx
2196 * - value 0
2197 * - XXX: already assigned to an address on the device
2198 */
2199 if (idev->rndid[0] == 0xfd &&
2200 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2201 (idev->rndid[7]&0x80))
2202 goto regen;
2203 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2204 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2205 goto regen;
2206 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2207 goto regen;
2208 }
2209 }
2210
2211 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2212 {
2213 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2214 ipv6_regen_rndid(idev);
2215 }
2216
2217 /*
2218 * Add prefix route.
2219 */
2220
2221 static void
2222 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2223 unsigned long expires, u32 flags)
2224 {
2225 struct fib6_config cfg = {
2226 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2227 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2228 .fc_ifindex = dev->ifindex,
2229 .fc_expires = expires,
2230 .fc_dst_len = plen,
2231 .fc_flags = RTF_UP | flags,
2232 .fc_nlinfo.nl_net = dev_net(dev),
2233 .fc_protocol = RTPROT_KERNEL,
2234 };
2235
2236 cfg.fc_dst = *pfx;
2237
2238 /* Prevent useless cloning on PtP SIT.
2239 This thing is done here expecting that the whole
2240 class of non-broadcast devices need not cloning.
2241 */
2242 #if IS_ENABLED(CONFIG_IPV6_SIT)
2243 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2244 cfg.fc_flags |= RTF_NONEXTHOP;
2245 #endif
2246
2247 ip6_route_add(&cfg);
2248 }
2249
2250
2251 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2252 int plen,
2253 const struct net_device *dev,
2254 u32 flags, u32 noflags)
2255 {
2256 struct fib6_node *fn;
2257 struct rt6_info *rt = NULL;
2258 struct fib6_table *table;
2259 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2260
2261 table = fib6_get_table(dev_net(dev), tb_id);
2262 if (!table)
2263 return NULL;
2264
2265 read_lock_bh(&table->tb6_lock);
2266 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2267 if (!fn)
2268 goto out;
2269
2270 noflags |= RTF_CACHE;
2271 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2272 if (rt->dst.dev->ifindex != dev->ifindex)
2273 continue;
2274 if ((rt->rt6i_flags & flags) != flags)
2275 continue;
2276 if ((rt->rt6i_flags & noflags) != 0)
2277 continue;
2278 dst_hold(&rt->dst);
2279 break;
2280 }
2281 out:
2282 read_unlock_bh(&table->tb6_lock);
2283 return rt;
2284 }
2285
2286
2287 /* Create "default" multicast route to the interface */
2288
2289 static void addrconf_add_mroute(struct net_device *dev)
2290 {
2291 struct fib6_config cfg = {
2292 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2293 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2294 .fc_ifindex = dev->ifindex,
2295 .fc_dst_len = 8,
2296 .fc_flags = RTF_UP,
2297 .fc_nlinfo.nl_net = dev_net(dev),
2298 };
2299
2300 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2301
2302 ip6_route_add(&cfg);
2303 }
2304
2305 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2306 {
2307 struct inet6_dev *idev;
2308
2309 ASSERT_RTNL();
2310
2311 idev = ipv6_find_idev(dev);
2312 if (!idev)
2313 return ERR_PTR(-ENOBUFS);
2314
2315 if (idev->cnf.disable_ipv6)
2316 return ERR_PTR(-EACCES);
2317
2318 /* Add default multicast route */
2319 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2320 addrconf_add_mroute(dev);
2321
2322 return idev;
2323 }
2324
2325 static void manage_tempaddrs(struct inet6_dev *idev,
2326 struct inet6_ifaddr *ifp,
2327 __u32 valid_lft, __u32 prefered_lft,
2328 bool create, unsigned long now)
2329 {
2330 u32 flags;
2331 struct inet6_ifaddr *ift;
2332
2333 read_lock_bh(&idev->lock);
2334 /* update all temporary addresses in the list */
2335 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2336 int age, max_valid, max_prefered;
2337
2338 if (ifp != ift->ifpub)
2339 continue;
2340
2341 /* RFC 4941 section 3.3:
2342 * If a received option will extend the lifetime of a public
2343 * address, the lifetimes of temporary addresses should
2344 * be extended, subject to the overall constraint that no
2345 * temporary addresses should ever remain "valid" or "preferred"
2346 * for a time longer than (TEMP_VALID_LIFETIME) or
2347 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2348 */
2349 age = (now - ift->cstamp) / HZ;
2350 max_valid = idev->cnf.temp_valid_lft - age;
2351 if (max_valid < 0)
2352 max_valid = 0;
2353
2354 max_prefered = idev->cnf.temp_prefered_lft -
2355 idev->desync_factor - age;
2356 if (max_prefered < 0)
2357 max_prefered = 0;
2358
2359 if (valid_lft > max_valid)
2360 valid_lft = max_valid;
2361
2362 if (prefered_lft > max_prefered)
2363 prefered_lft = max_prefered;
2364
2365 spin_lock(&ift->lock);
2366 flags = ift->flags;
2367 ift->valid_lft = valid_lft;
2368 ift->prefered_lft = prefered_lft;
2369 ift->tstamp = now;
2370 if (prefered_lft > 0)
2371 ift->flags &= ~IFA_F_DEPRECATED;
2372
2373 spin_unlock(&ift->lock);
2374 if (!(flags&IFA_F_TENTATIVE))
2375 ipv6_ifa_notify(0, ift);
2376 }
2377
2378 if ((create || list_empty(&idev->tempaddr_list)) &&
2379 idev->cnf.use_tempaddr > 0) {
2380 /* When a new public address is created as described
2381 * in [ADDRCONF], also create a new temporary address.
2382 * Also create a temporary address if it's enabled but
2383 * no temporary address currently exists.
2384 */
2385 read_unlock_bh(&idev->lock);
2386 ipv6_create_tempaddr(ifp, NULL);
2387 } else {
2388 read_unlock_bh(&idev->lock);
2389 }
2390 }
2391
2392 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2393 {
2394 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2395 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2396 }
2397
2398 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2399 const struct prefix_info *pinfo,
2400 struct inet6_dev *in6_dev,
2401 const struct in6_addr *addr, int addr_type,
2402 u32 addr_flags, bool sllao, bool tokenized,
2403 __u32 valid_lft, u32 prefered_lft)
2404 {
2405 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2406 int create = 0, update_lft = 0;
2407
2408 if (!ifp && valid_lft) {
2409 int max_addresses = in6_dev->cnf.max_addresses;
2410
2411 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2412 if (in6_dev->cnf.optimistic_dad &&
2413 !net->ipv6.devconf_all->forwarding && sllao)
2414 addr_flags |= IFA_F_OPTIMISTIC;
2415 #endif
2416
2417 /* Do not allow to create too much of autoconfigured
2418 * addresses; this would be too easy way to crash kernel.
2419 */
2420 if (!max_addresses ||
2421 ipv6_count_addresses(in6_dev) < max_addresses)
2422 ifp = ipv6_add_addr(in6_dev, addr, NULL,
2423 pinfo->prefix_len,
2424 addr_type&IPV6_ADDR_SCOPE_MASK,
2425 addr_flags, valid_lft,
2426 prefered_lft);
2427
2428 if (IS_ERR_OR_NULL(ifp))
2429 return -1;
2430
2431 update_lft = 0;
2432 create = 1;
2433 spin_lock_bh(&ifp->lock);
2434 ifp->flags |= IFA_F_MANAGETEMPADDR;
2435 ifp->cstamp = jiffies;
2436 ifp->tokenized = tokenized;
2437 spin_unlock_bh(&ifp->lock);
2438 addrconf_dad_start(ifp);
2439 }
2440
2441 if (ifp) {
2442 u32 flags;
2443 unsigned long now;
2444 u32 stored_lft;
2445
2446 /* update lifetime (RFC2462 5.5.3 e) */
2447 spin_lock_bh(&ifp->lock);
2448 now = jiffies;
2449 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2450 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2451 else
2452 stored_lft = 0;
2453 if (!update_lft && !create && stored_lft) {
2454 const u32 minimum_lft = min_t(u32,
2455 stored_lft, MIN_VALID_LIFETIME);
2456 valid_lft = max(valid_lft, minimum_lft);
2457
2458 /* RFC4862 Section 5.5.3e:
2459 * "Note that the preferred lifetime of the
2460 * corresponding address is always reset to
2461 * the Preferred Lifetime in the received
2462 * Prefix Information option, regardless of
2463 * whether the valid lifetime is also reset or
2464 * ignored."
2465 *
2466 * So we should always update prefered_lft here.
2467 */
2468 update_lft = 1;
2469 }
2470
2471 if (update_lft) {
2472 ifp->valid_lft = valid_lft;
2473 ifp->prefered_lft = prefered_lft;
2474 ifp->tstamp = now;
2475 flags = ifp->flags;
2476 ifp->flags &= ~IFA_F_DEPRECATED;
2477 spin_unlock_bh(&ifp->lock);
2478
2479 if (!(flags&IFA_F_TENTATIVE))
2480 ipv6_ifa_notify(0, ifp);
2481 } else
2482 spin_unlock_bh(&ifp->lock);
2483
2484 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2485 create, now);
2486
2487 in6_ifa_put(ifp);
2488 addrconf_verify();
2489 }
2490
2491 return 0;
2492 }
2493 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2494
2495 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2496 {
2497 struct prefix_info *pinfo;
2498 __u32 valid_lft;
2499 __u32 prefered_lft;
2500 int addr_type, err;
2501 u32 addr_flags = 0;
2502 struct inet6_dev *in6_dev;
2503 struct net *net = dev_net(dev);
2504
2505 pinfo = (struct prefix_info *) opt;
2506
2507 if (len < sizeof(struct prefix_info)) {
2508 ADBG("addrconf: prefix option too short\n");
2509 return;
2510 }
2511
2512 /*
2513 * Validation checks ([ADDRCONF], page 19)
2514 */
2515
2516 addr_type = ipv6_addr_type(&pinfo->prefix);
2517
2518 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2519 return;
2520
2521 valid_lft = ntohl(pinfo->valid);
2522 prefered_lft = ntohl(pinfo->prefered);
2523
2524 if (prefered_lft > valid_lft) {
2525 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2526 return;
2527 }
2528
2529 in6_dev = in6_dev_get(dev);
2530
2531 if (!in6_dev) {
2532 net_dbg_ratelimited("addrconf: device %s not configured\n",
2533 dev->name);
2534 return;
2535 }
2536
2537 /*
2538 * Two things going on here:
2539 * 1) Add routes for on-link prefixes
2540 * 2) Configure prefixes with the auto flag set
2541 */
2542
2543 if (pinfo->onlink) {
2544 struct rt6_info *rt;
2545 unsigned long rt_expires;
2546
2547 /* Avoid arithmetic overflow. Really, we could
2548 * save rt_expires in seconds, likely valid_lft,
2549 * but it would require division in fib gc, that it
2550 * not good.
2551 */
2552 if (HZ > USER_HZ)
2553 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2554 else
2555 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2556
2557 if (addrconf_finite_timeout(rt_expires))
2558 rt_expires *= HZ;
2559
2560 rt = addrconf_get_prefix_route(&pinfo->prefix,
2561 pinfo->prefix_len,
2562 dev,
2563 RTF_ADDRCONF | RTF_PREFIX_RT,
2564 RTF_GATEWAY | RTF_DEFAULT);
2565
2566 if (rt) {
2567 /* Autoconf prefix route */
2568 if (valid_lft == 0) {
2569 ip6_del_rt(rt);
2570 rt = NULL;
2571 } else if (addrconf_finite_timeout(rt_expires)) {
2572 /* not infinity */
2573 rt6_set_expires(rt, jiffies + rt_expires);
2574 } else {
2575 rt6_clean_expires(rt);
2576 }
2577 } else if (valid_lft) {
2578 clock_t expires = 0;
2579 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2580 if (addrconf_finite_timeout(rt_expires)) {
2581 /* not infinity */
2582 flags |= RTF_EXPIRES;
2583 expires = jiffies_to_clock_t(rt_expires);
2584 }
2585 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2586 dev, expires, flags);
2587 }
2588 ip6_rt_put(rt);
2589 }
2590
2591 /* Try to figure out our local address for this prefix */
2592
2593 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2594 struct in6_addr addr;
2595 bool tokenized = false, dev_addr_generated = false;
2596
2597 if (pinfo->prefix_len == 64) {
2598 memcpy(&addr, &pinfo->prefix, 8);
2599
2600 if (!ipv6_addr_any(&in6_dev->token)) {
2601 read_lock_bh(&in6_dev->lock);
2602 memcpy(addr.s6_addr + 8,
2603 in6_dev->token.s6_addr + 8, 8);
2604 read_unlock_bh(&in6_dev->lock);
2605 tokenized = true;
2606 } else if (is_addr_mode_generate_stable(in6_dev) &&
2607 !ipv6_generate_stable_address(&addr, 0,
2608 in6_dev)) {
2609 addr_flags |= IFA_F_STABLE_PRIVACY;
2610 goto ok;
2611 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2612 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2613 goto put;
2614 } else {
2615 dev_addr_generated = true;
2616 }
2617 goto ok;
2618 }
2619 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2620 pinfo->prefix_len);
2621 goto put;
2622
2623 ok:
2624 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2625 &addr, addr_type,
2626 addr_flags, sllao,
2627 tokenized, valid_lft,
2628 prefered_lft);
2629 if (err)
2630 goto put;
2631
2632 /* Ignore error case here because previous prefix add addr was
2633 * successful which will be notified.
2634 */
2635 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2636 addr_type, addr_flags, sllao,
2637 tokenized, valid_lft,
2638 prefered_lft,
2639 dev_addr_generated);
2640 }
2641 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2642 put:
2643 in6_dev_put(in6_dev);
2644 }
2645
2646 /*
2647 * Set destination address.
2648 * Special case for SIT interfaces where we create a new "virtual"
2649 * device.
2650 */
2651 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2652 {
2653 struct in6_ifreq ireq;
2654 struct net_device *dev;
2655 int err = -EINVAL;
2656
2657 rtnl_lock();
2658
2659 err = -EFAULT;
2660 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2661 goto err_exit;
2662
2663 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2664
2665 err = -ENODEV;
2666 if (!dev)
2667 goto err_exit;
2668
2669 #if IS_ENABLED(CONFIG_IPV6_SIT)
2670 if (dev->type == ARPHRD_SIT) {
2671 const struct net_device_ops *ops = dev->netdev_ops;
2672 struct ifreq ifr;
2673 struct ip_tunnel_parm p;
2674
2675 err = -EADDRNOTAVAIL;
2676 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2677 goto err_exit;
2678
2679 memset(&p, 0, sizeof(p));
2680 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2681 p.iph.saddr = 0;
2682 p.iph.version = 4;
2683 p.iph.ihl = 5;
2684 p.iph.protocol = IPPROTO_IPV6;
2685 p.iph.ttl = 64;
2686 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2687
2688 if (ops->ndo_do_ioctl) {
2689 mm_segment_t oldfs = get_fs();
2690
2691 set_fs(KERNEL_DS);
2692 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2693 set_fs(oldfs);
2694 } else
2695 err = -EOPNOTSUPP;
2696
2697 if (err == 0) {
2698 err = -ENOBUFS;
2699 dev = __dev_get_by_name(net, p.name);
2700 if (!dev)
2701 goto err_exit;
2702 err = dev_open(dev);
2703 }
2704 }
2705 #endif
2706
2707 err_exit:
2708 rtnl_unlock();
2709 return err;
2710 }
2711
2712 static int ipv6_mc_config(struct sock *sk, bool join,
2713 const struct in6_addr *addr, int ifindex)
2714 {
2715 int ret;
2716
2717 ASSERT_RTNL();
2718
2719 lock_sock(sk);
2720 if (join)
2721 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2722 else
2723 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2724 release_sock(sk);
2725
2726 return ret;
2727 }
2728
2729 /*
2730 * Manual configuration of address on an interface
2731 */
2732 static int inet6_addr_add(struct net *net, int ifindex,
2733 const struct in6_addr *pfx,
2734 const struct in6_addr *peer_pfx,
2735 unsigned int plen, __u32 ifa_flags,
2736 __u32 prefered_lft, __u32 valid_lft)
2737 {
2738 struct inet6_ifaddr *ifp;
2739 struct inet6_dev *idev;
2740 struct net_device *dev;
2741 unsigned long timeout;
2742 clock_t expires;
2743 int scope;
2744 u32 flags;
2745
2746 ASSERT_RTNL();
2747
2748 if (plen > 128)
2749 return -EINVAL;
2750
2751 /* check the lifetime */
2752 if (!valid_lft || prefered_lft > valid_lft)
2753 return -EINVAL;
2754
2755 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2756 return -EINVAL;
2757
2758 dev = __dev_get_by_index(net, ifindex);
2759 if (!dev)
2760 return -ENODEV;
2761
2762 idev = addrconf_add_dev(dev);
2763 if (IS_ERR(idev))
2764 return PTR_ERR(idev);
2765
2766 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2767 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2768 true, pfx, ifindex);
2769
2770 if (ret < 0)
2771 return ret;
2772 }
2773
2774 scope = ipv6_addr_scope(pfx);
2775
2776 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2777 if (addrconf_finite_timeout(timeout)) {
2778 expires = jiffies_to_clock_t(timeout * HZ);
2779 valid_lft = timeout;
2780 flags = RTF_EXPIRES;
2781 } else {
2782 expires = 0;
2783 flags = 0;
2784 ifa_flags |= IFA_F_PERMANENT;
2785 }
2786
2787 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2788 if (addrconf_finite_timeout(timeout)) {
2789 if (timeout == 0)
2790 ifa_flags |= IFA_F_DEPRECATED;
2791 prefered_lft = timeout;
2792 }
2793
2794 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2795 valid_lft, prefered_lft);
2796
2797 if (!IS_ERR(ifp)) {
2798 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2799 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2800 expires, flags);
2801 }
2802
2803 /*
2804 * Note that section 3.1 of RFC 4429 indicates
2805 * that the Optimistic flag should not be set for
2806 * manually configured addresses
2807 */
2808 addrconf_dad_start(ifp);
2809 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2810 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2811 true, jiffies);
2812 in6_ifa_put(ifp);
2813 addrconf_verify_rtnl();
2814 return 0;
2815 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2816 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2817 false, pfx, ifindex);
2818 }
2819
2820 return PTR_ERR(ifp);
2821 }
2822
2823 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2824 const struct in6_addr *pfx, unsigned int plen)
2825 {
2826 struct inet6_ifaddr *ifp;
2827 struct inet6_dev *idev;
2828 struct net_device *dev;
2829
2830 if (plen > 128)
2831 return -EINVAL;
2832
2833 dev = __dev_get_by_index(net, ifindex);
2834 if (!dev)
2835 return -ENODEV;
2836
2837 idev = __in6_dev_get(dev);
2838 if (!idev)
2839 return -ENXIO;
2840
2841 read_lock_bh(&idev->lock);
2842 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2843 if (ifp->prefix_len == plen &&
2844 ipv6_addr_equal(pfx, &ifp->addr)) {
2845 in6_ifa_hold(ifp);
2846 read_unlock_bh(&idev->lock);
2847
2848 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2849 (ifa_flags & IFA_F_MANAGETEMPADDR))
2850 manage_tempaddrs(idev, ifp, 0, 0, false,
2851 jiffies);
2852 ipv6_del_addr(ifp);
2853 addrconf_verify_rtnl();
2854 if (ipv6_addr_is_multicast(pfx)) {
2855 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2856 false, pfx, dev->ifindex);
2857 }
2858 return 0;
2859 }
2860 }
2861 read_unlock_bh(&idev->lock);
2862 return -EADDRNOTAVAIL;
2863 }
2864
2865
2866 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2867 {
2868 struct in6_ifreq ireq;
2869 int err;
2870
2871 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2872 return -EPERM;
2873
2874 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2875 return -EFAULT;
2876
2877 rtnl_lock();
2878 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2879 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2880 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2881 rtnl_unlock();
2882 return err;
2883 }
2884
2885 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2886 {
2887 struct in6_ifreq ireq;
2888 int err;
2889
2890 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2891 return -EPERM;
2892
2893 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2894 return -EFAULT;
2895
2896 rtnl_lock();
2897 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2898 ireq.ifr6_prefixlen);
2899 rtnl_unlock();
2900 return err;
2901 }
2902
2903 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2904 int plen, int scope)
2905 {
2906 struct inet6_ifaddr *ifp;
2907
2908 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2909 scope, IFA_F_PERMANENT,
2910 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2911 if (!IS_ERR(ifp)) {
2912 spin_lock_bh(&ifp->lock);
2913 ifp->flags &= ~IFA_F_TENTATIVE;
2914 spin_unlock_bh(&ifp->lock);
2915 rt_genid_bump_ipv6(dev_net(idev->dev));
2916 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2917 in6_ifa_put(ifp);
2918 }
2919 }
2920
2921 #if IS_ENABLED(CONFIG_IPV6_SIT)
2922 static void sit_add_v4_addrs(struct inet6_dev *idev)
2923 {
2924 struct in6_addr addr;
2925 struct net_device *dev;
2926 struct net *net = dev_net(idev->dev);
2927 int scope, plen;
2928 u32 pflags = 0;
2929
2930 ASSERT_RTNL();
2931
2932 memset(&addr, 0, sizeof(struct in6_addr));
2933 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2934
2935 if (idev->dev->flags&IFF_POINTOPOINT) {
2936 addr.s6_addr32[0] = htonl(0xfe800000);
2937 scope = IFA_LINK;
2938 plen = 64;
2939 } else {
2940 scope = IPV6_ADDR_COMPATv4;
2941 plen = 96;
2942 pflags |= RTF_NONEXTHOP;
2943 }
2944
2945 if (addr.s6_addr32[3]) {
2946 add_addr(idev, &addr, plen, scope);
2947 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2948 return;
2949 }
2950
2951 for_each_netdev(net, dev) {
2952 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2953 if (in_dev && (dev->flags & IFF_UP)) {
2954 struct in_ifaddr *ifa;
2955
2956 int flag = scope;
2957
2958 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2959
2960 addr.s6_addr32[3] = ifa->ifa_local;
2961
2962 if (ifa->ifa_scope == RT_SCOPE_LINK)
2963 continue;
2964 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2965 if (idev->dev->flags&IFF_POINTOPOINT)
2966 continue;
2967 flag |= IFA_HOST;
2968 }
2969
2970 add_addr(idev, &addr, plen, flag);
2971 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2972 pflags);
2973 }
2974 }
2975 }
2976 }
2977 #endif
2978
2979 static void init_loopback(struct net_device *dev)
2980 {
2981 struct inet6_dev *idev;
2982 struct net_device *sp_dev;
2983 struct inet6_ifaddr *sp_ifa;
2984 struct rt6_info *sp_rt;
2985
2986 /* ::1 */
2987
2988 ASSERT_RTNL();
2989
2990 idev = ipv6_find_idev(dev);
2991 if (!idev) {
2992 pr_debug("%s: add_dev failed\n", __func__);
2993 return;
2994 }
2995
2996 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2997
2998 /* Add routes to other interface's IPv6 addresses */
2999 for_each_netdev(dev_net(dev), sp_dev) {
3000 if (!strcmp(sp_dev->name, dev->name))
3001 continue;
3002
3003 idev = __in6_dev_get(sp_dev);
3004 if (!idev)
3005 continue;
3006
3007 read_lock_bh(&idev->lock);
3008 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
3009
3010 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
3011 continue;
3012
3013 if (sp_ifa->rt) {
3014 /* This dst has been added to garbage list when
3015 * lo device down, release this obsolete dst and
3016 * reallocate a new router for ifa.
3017 */
3018 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
3019 ip6_rt_put(sp_ifa->rt);
3020 sp_ifa->rt = NULL;
3021 } else {
3022 continue;
3023 }
3024 }
3025
3026 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
3027
3028 /* Failure cases are ignored */
3029 if (!IS_ERR(sp_rt)) {
3030 sp_ifa->rt = sp_rt;
3031 ip6_ins_rt(sp_rt);
3032 }
3033 }
3034 read_unlock_bh(&idev->lock);
3035 }
3036 }
3037
3038 void addrconf_add_linklocal(struct inet6_dev *idev,
3039 const struct in6_addr *addr, u32 flags)
3040 {
3041 struct inet6_ifaddr *ifp;
3042 u32 addr_flags = flags | IFA_F_PERMANENT;
3043
3044 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3045 if (idev->cnf.optimistic_dad &&
3046 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3047 addr_flags |= IFA_F_OPTIMISTIC;
3048 #endif
3049
3050 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
3051 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
3052 if (!IS_ERR(ifp)) {
3053 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
3054 addrconf_dad_start(ifp);
3055 in6_ifa_put(ifp);
3056 }
3057 }
3058 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3059
3060 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3061 {
3062 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3063 return true;
3064
3065 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3066 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3067 return true;
3068
3069 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3070 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3071 return true;
3072
3073 return false;
3074 }
3075
3076 static int ipv6_generate_stable_address(struct in6_addr *address,
3077 u8 dad_count,
3078 const struct inet6_dev *idev)
3079 {
3080 static DEFINE_SPINLOCK(lock);
3081 static __u32 digest[SHA_DIGEST_WORDS];
3082 static __u32 workspace[SHA_WORKSPACE_WORDS];
3083
3084 static union {
3085 char __data[SHA_MESSAGE_BYTES];
3086 struct {
3087 struct in6_addr secret;
3088 __be32 prefix[2];
3089 unsigned char hwaddr[MAX_ADDR_LEN];
3090 u8 dad_count;
3091 } __packed;
3092 } data;
3093
3094 struct in6_addr secret;
3095 struct in6_addr temp;
3096 struct net *net = dev_net(idev->dev);
3097
3098 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3099
3100 if (idev->cnf.stable_secret.initialized)
3101 secret = idev->cnf.stable_secret.secret;
3102 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3103 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3104 else
3105 return -1;
3106
3107 retry:
3108 spin_lock_bh(&lock);
3109
3110 sha_init(digest);
3111 memset(&data, 0, sizeof(data));
3112 memset(workspace, 0, sizeof(workspace));
3113 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3114 data.prefix[0] = address->s6_addr32[0];
3115 data.prefix[1] = address->s6_addr32[1];
3116 data.secret = secret;
3117 data.dad_count = dad_count;
3118
3119 sha_transform(digest, data.__data, workspace);
3120
3121 temp = *address;
3122 temp.s6_addr32[2] = (__force __be32)digest[0];
3123 temp.s6_addr32[3] = (__force __be32)digest[1];
3124
3125 spin_unlock_bh(&lock);
3126
3127 if (ipv6_reserved_interfaceid(temp)) {
3128 dad_count++;
3129 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3130 return -1;
3131 goto retry;
3132 }
3133
3134 *address = temp;
3135 return 0;
3136 }
3137
3138 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3139 {
3140 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3141
3142 if (s->initialized)
3143 return;
3144 s = &idev->cnf.stable_secret;
3145 get_random_bytes(&s->secret, sizeof(s->secret));
3146 s->initialized = true;
3147 }
3148
3149 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3150 {
3151 struct in6_addr addr;
3152
3153 /* no link local addresses on L3 master devices */
3154 if (netif_is_l3_master(idev->dev))
3155 return;
3156
3157 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3158
3159 switch (idev->cnf.addr_gen_mode) {
3160 case IN6_ADDR_GEN_MODE_RANDOM:
3161 ipv6_gen_mode_random_init(idev);
3162 /* fallthrough */
3163 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3164 if (!ipv6_generate_stable_address(&addr, 0, idev))
3165 addrconf_add_linklocal(idev, &addr,
3166 IFA_F_STABLE_PRIVACY);
3167 else if (prefix_route)
3168 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3169 break;
3170 case IN6_ADDR_GEN_MODE_EUI64:
3171 /* addrconf_add_linklocal also adds a prefix_route and we
3172 * only need to care about prefix routes if ipv6_generate_eui64
3173 * couldn't generate one.
3174 */
3175 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3176 addrconf_add_linklocal(idev, &addr, 0);
3177 else if (prefix_route)
3178 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3179 break;
3180 case IN6_ADDR_GEN_MODE_NONE:
3181 default:
3182 /* will not add any link local address */
3183 break;
3184 }
3185 }
3186
3187 static void addrconf_dev_config(struct net_device *dev)
3188 {
3189 struct inet6_dev *idev;
3190
3191 ASSERT_RTNL();
3192
3193 if ((dev->type != ARPHRD_ETHER) &&
3194 (dev->type != ARPHRD_FDDI) &&
3195 (dev->type != ARPHRD_ARCNET) &&
3196 (dev->type != ARPHRD_INFINIBAND) &&
3197 (dev->type != ARPHRD_IEEE1394) &&
3198 (dev->type != ARPHRD_TUNNEL6) &&
3199 (dev->type != ARPHRD_6LOWPAN) &&
3200 (dev->type != ARPHRD_IP6GRE) &&
3201 (dev->type != ARPHRD_IPGRE) &&
3202 (dev->type != ARPHRD_TUNNEL) &&
3203 (dev->type != ARPHRD_NONE)) {
3204 /* Alas, we support only Ethernet autoconfiguration. */
3205 return;
3206 }
3207
3208 idev = addrconf_add_dev(dev);
3209 if (IS_ERR(idev))
3210 return;
3211
3212 /* this device type has no EUI support */
3213 if (dev->type == ARPHRD_NONE &&
3214 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3215 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3216
3217 addrconf_addr_gen(idev, false);
3218 }
3219
3220 #if IS_ENABLED(CONFIG_IPV6_SIT)
3221 static void addrconf_sit_config(struct net_device *dev)
3222 {
3223 struct inet6_dev *idev;
3224
3225 ASSERT_RTNL();
3226
3227 /*
3228 * Configure the tunnel with one of our IPv4
3229 * addresses... we should configure all of
3230 * our v4 addrs in the tunnel
3231 */
3232
3233 idev = ipv6_find_idev(dev);
3234 if (!idev) {
3235 pr_debug("%s: add_dev failed\n", __func__);
3236 return;
3237 }
3238
3239 if (dev->priv_flags & IFF_ISATAP) {
3240 addrconf_addr_gen(idev, false);
3241 return;
3242 }
3243
3244 sit_add_v4_addrs(idev);
3245
3246 if (dev->flags&IFF_POINTOPOINT)
3247 addrconf_add_mroute(dev);
3248 }
3249 #endif
3250
3251 #if IS_ENABLED(CONFIG_NET_IPGRE)
3252 static void addrconf_gre_config(struct net_device *dev)
3253 {
3254 struct inet6_dev *idev;
3255
3256 ASSERT_RTNL();
3257
3258 idev = ipv6_find_idev(dev);
3259 if (!idev) {
3260 pr_debug("%s: add_dev failed\n", __func__);
3261 return;
3262 }
3263
3264 addrconf_addr_gen(idev, true);
3265 if (dev->flags & IFF_POINTOPOINT)
3266 addrconf_add_mroute(dev);
3267 }
3268 #endif
3269
3270 static int fixup_permanent_addr(struct inet6_dev *idev,
3271 struct inet6_ifaddr *ifp)
3272 {
3273 if (!ifp->rt) {
3274 struct rt6_info *rt;
3275
3276 rt = addrconf_dst_alloc(idev, &ifp->addr, false);
3277 if (unlikely(IS_ERR(rt)))
3278 return PTR_ERR(rt);
3279
3280 ifp->rt = rt;
3281 }
3282
3283 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3284 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3285 idev->dev, 0, 0);
3286 }
3287
3288 addrconf_dad_start(ifp);
3289
3290 return 0;
3291 }
3292
3293 static void addrconf_permanent_addr(struct net_device *dev)
3294 {
3295 struct inet6_ifaddr *ifp, *tmp;
3296 struct inet6_dev *idev;
3297
3298 idev = __in6_dev_get(dev);
3299 if (!idev)
3300 return;
3301
3302 write_lock_bh(&idev->lock);
3303
3304 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3305 if ((ifp->flags & IFA_F_PERMANENT) &&
3306 fixup_permanent_addr(idev, ifp) < 0) {
3307 write_unlock_bh(&idev->lock);
3308 ipv6_del_addr(ifp);
3309 write_lock_bh(&idev->lock);
3310
3311 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3312 idev->dev->name, &ifp->addr);
3313 }
3314 }
3315
3316 write_unlock_bh(&idev->lock);
3317 }
3318
3319 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3320 void *ptr)
3321 {
3322 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3323 struct netdev_notifier_changeupper_info *info;
3324 struct inet6_dev *idev = __in6_dev_get(dev);
3325 int run_pending = 0;
3326 int err;
3327
3328 switch (event) {
3329 case NETDEV_REGISTER:
3330 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3331 idev = ipv6_add_dev(dev);
3332 if (IS_ERR(idev))
3333 return notifier_from_errno(PTR_ERR(idev));
3334 }
3335 break;
3336
3337 case NETDEV_CHANGEMTU:
3338 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3339 if (dev->mtu < IPV6_MIN_MTU) {
3340 addrconf_ifdown(dev, 1);
3341 break;
3342 }
3343
3344 if (idev) {
3345 rt6_mtu_change(dev, dev->mtu);
3346 idev->cnf.mtu6 = dev->mtu;
3347 break;
3348 }
3349
3350 /* allocate new idev */
3351 idev = ipv6_add_dev(dev);
3352 if (IS_ERR(idev))
3353 break;
3354
3355 /* device is still not ready */
3356 if (!(idev->if_flags & IF_READY))
3357 break;
3358
3359 run_pending = 1;
3360
3361 /* fall through */
3362
3363 case NETDEV_UP:
3364 case NETDEV_CHANGE:
3365 if (dev->flags & IFF_SLAVE)
3366 break;
3367
3368 if (idev && idev->cnf.disable_ipv6)
3369 break;
3370
3371 if (event == NETDEV_UP) {
3372 /* restore routes for permanent addresses */
3373 addrconf_permanent_addr(dev);
3374
3375 if (!addrconf_qdisc_ok(dev)) {
3376 /* device is not ready yet. */
3377 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3378 dev->name);
3379 break;
3380 }
3381
3382 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3383 idev = ipv6_add_dev(dev);
3384
3385 if (!IS_ERR_OR_NULL(idev)) {
3386 idev->if_flags |= IF_READY;
3387 run_pending = 1;
3388 }
3389 } else if (event == NETDEV_CHANGE) {
3390 if (!addrconf_qdisc_ok(dev)) {
3391 /* device is still not ready. */
3392 break;
3393 }
3394
3395 if (idev) {
3396 if (idev->if_flags & IF_READY)
3397 /* device is already configured. */
3398 break;
3399 idev->if_flags |= IF_READY;
3400 }
3401
3402 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3403 dev->name);
3404
3405 run_pending = 1;
3406 }
3407
3408 switch (dev->type) {
3409 #if IS_ENABLED(CONFIG_IPV6_SIT)
3410 case ARPHRD_SIT:
3411 addrconf_sit_config(dev);
3412 break;
3413 #endif
3414 #if IS_ENABLED(CONFIG_NET_IPGRE)
3415 case ARPHRD_IPGRE:
3416 addrconf_gre_config(dev);
3417 break;
3418 #endif
3419 case ARPHRD_LOOPBACK:
3420 init_loopback(dev);
3421 break;
3422
3423 default:
3424 addrconf_dev_config(dev);
3425 break;
3426 }
3427
3428 if (!IS_ERR_OR_NULL(idev)) {
3429 if (run_pending)
3430 addrconf_dad_run(idev);
3431
3432 /*
3433 * If the MTU changed during the interface down,
3434 * when the interface up, the changed MTU must be
3435 * reflected in the idev as well as routers.
3436 */
3437 if (idev->cnf.mtu6 != dev->mtu &&
3438 dev->mtu >= IPV6_MIN_MTU) {
3439 rt6_mtu_change(dev, dev->mtu);
3440 idev->cnf.mtu6 = dev->mtu;
3441 }
3442 idev->tstamp = jiffies;
3443 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3444
3445 /*
3446 * If the changed mtu during down is lower than
3447 * IPV6_MIN_MTU stop IPv6 on this interface.
3448 */
3449 if (dev->mtu < IPV6_MIN_MTU)
3450 addrconf_ifdown(dev, 1);
3451 }
3452 break;
3453
3454 case NETDEV_DOWN:
3455 case NETDEV_UNREGISTER:
3456 /*
3457 * Remove all addresses from this interface.
3458 */
3459 addrconf_ifdown(dev, event != NETDEV_DOWN);
3460 break;
3461
3462 case NETDEV_CHANGENAME:
3463 if (idev) {
3464 snmp6_unregister_dev(idev);
3465 addrconf_sysctl_unregister(idev);
3466 err = addrconf_sysctl_register(idev);
3467 if (err)
3468 return notifier_from_errno(err);
3469 err = snmp6_register_dev(idev);
3470 if (err) {
3471 addrconf_sysctl_unregister(idev);
3472 return notifier_from_errno(err);
3473 }
3474 }
3475 break;
3476
3477 case NETDEV_PRE_TYPE_CHANGE:
3478 case NETDEV_POST_TYPE_CHANGE:
3479 if (idev)
3480 addrconf_type_change(dev, event);
3481 break;
3482
3483 case NETDEV_CHANGEUPPER:
3484 info = ptr;
3485
3486 /* flush all routes if dev is linked to or unlinked from
3487 * an L3 master device (e.g., VRF)
3488 */
3489 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3490 addrconf_ifdown(dev, 0);
3491 }
3492
3493 return NOTIFY_OK;
3494 }
3495
3496 /*
3497 * addrconf module should be notified of a device going up
3498 */
3499 static struct notifier_block ipv6_dev_notf = {
3500 .notifier_call = addrconf_notify,
3501 };
3502
3503 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3504 {
3505 struct inet6_dev *idev;
3506 ASSERT_RTNL();
3507
3508 idev = __in6_dev_get(dev);
3509
3510 if (event == NETDEV_POST_TYPE_CHANGE)
3511 ipv6_mc_remap(idev);
3512 else if (event == NETDEV_PRE_TYPE_CHANGE)
3513 ipv6_mc_unmap(idev);
3514 }
3515
3516 static bool addr_is_local(const struct in6_addr *addr)
3517 {
3518 return ipv6_addr_type(addr) &
3519 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3520 }
3521
3522 static int addrconf_ifdown(struct net_device *dev, int how)
3523 {
3524 struct net *net = dev_net(dev);
3525 struct inet6_dev *idev;
3526 struct inet6_ifaddr *ifa, *tmp;
3527 struct list_head del_list;
3528 int _keep_addr;
3529 bool keep_addr;
3530 int state, i;
3531
3532 ASSERT_RTNL();
3533
3534 rt6_ifdown(net, dev);
3535 neigh_ifdown(&nd_tbl, dev);
3536
3537 idev = __in6_dev_get(dev);
3538 if (!idev)
3539 return -ENODEV;
3540
3541 /*
3542 * Step 1: remove reference to ipv6 device from parent device.
3543 * Do not dev_put!
3544 */
3545 if (how) {
3546 idev->dead = 1;
3547
3548 /* protected by rtnl_lock */
3549 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3550
3551 /* Step 1.5: remove snmp6 entry */
3552 snmp6_unregister_dev(idev);
3553
3554 }
3555
3556 /* aggregate the system setting and interface setting */
3557 _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3558 if (!_keep_addr)
3559 _keep_addr = idev->cnf.keep_addr_on_down;
3560
3561 /* combine the user config with event to determine if permanent
3562 * addresses are to be removed from address hash table
3563 */
3564 keep_addr = !(how || _keep_addr <= 0 || idev->cnf.disable_ipv6);
3565
3566 /* Step 2: clear hash table */
3567 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3568 struct hlist_head *h = &inet6_addr_lst[i];
3569
3570 spin_lock_bh(&addrconf_hash_lock);
3571 restart:
3572 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3573 if (ifa->idev == idev) {
3574 addrconf_del_dad_work(ifa);
3575 /* combined flag + permanent flag decide if
3576 * address is retained on a down event
3577 */
3578 if (!keep_addr ||
3579 !(ifa->flags & IFA_F_PERMANENT) ||
3580 addr_is_local(&ifa->addr)) {
3581 hlist_del_init_rcu(&ifa->addr_lst);
3582 goto restart;
3583 }
3584 }
3585 }
3586 spin_unlock_bh(&addrconf_hash_lock);
3587 }
3588
3589 write_lock_bh(&idev->lock);
3590
3591 addrconf_del_rs_timer(idev);
3592
3593 /* Step 2: clear flags for stateless addrconf */
3594 if (!how)
3595 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3596
3597 /* Step 3: clear tempaddr list */
3598 while (!list_empty(&idev->tempaddr_list)) {
3599 ifa = list_first_entry(&idev->tempaddr_list,
3600 struct inet6_ifaddr, tmp_list);
3601 list_del(&ifa->tmp_list);
3602 write_unlock_bh(&idev->lock);
3603 spin_lock_bh(&ifa->lock);
3604
3605 if (ifa->ifpub) {
3606 in6_ifa_put(ifa->ifpub);
3607 ifa->ifpub = NULL;
3608 }
3609 spin_unlock_bh(&ifa->lock);
3610 in6_ifa_put(ifa);
3611 write_lock_bh(&idev->lock);
3612 }
3613
3614 /* re-combine the user config with event to determine if permanent
3615 * addresses are to be removed from the interface list
3616 */
3617 keep_addr = (!how && _keep_addr > 0 && !idev->cnf.disable_ipv6);
3618
3619 INIT_LIST_HEAD(&del_list);
3620 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3621 struct rt6_info *rt = NULL;
3622
3623 addrconf_del_dad_work(ifa);
3624
3625 write_unlock_bh(&idev->lock);
3626 spin_lock_bh(&ifa->lock);
3627
3628 if (keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3629 !addr_is_local(&ifa->addr)) {
3630 /* set state to skip the notifier below */
3631 state = INET6_IFADDR_STATE_DEAD;
3632 ifa->state = 0;
3633 if (!(ifa->flags & IFA_F_NODAD))
3634 ifa->flags |= IFA_F_TENTATIVE;
3635
3636 rt = ifa->rt;
3637 ifa->rt = NULL;
3638 } else {
3639 state = ifa->state;
3640 ifa->state = INET6_IFADDR_STATE_DEAD;
3641
3642 list_move(&ifa->if_list, &del_list);
3643 }
3644
3645 spin_unlock_bh(&ifa->lock);
3646
3647 if (rt)
3648 ip6_del_rt(rt);
3649
3650 if (state != INET6_IFADDR_STATE_DEAD) {
3651 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3652 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3653 } else {
3654 if (idev->cnf.forwarding)
3655 addrconf_leave_anycast(ifa);
3656 addrconf_leave_solict(ifa->idev, &ifa->addr);
3657 }
3658
3659 write_lock_bh(&idev->lock);
3660 }
3661
3662 write_unlock_bh(&idev->lock);
3663
3664 /* now clean up addresses to be removed */
3665 while (!list_empty(&del_list)) {
3666 ifa = list_first_entry(&del_list,
3667 struct inet6_ifaddr, if_list);
3668 list_del(&ifa->if_list);
3669
3670 in6_ifa_put(ifa);
3671 }
3672
3673 /* Step 5: Discard anycast and multicast list */
3674 if (how) {
3675 ipv6_ac_destroy_dev(idev);
3676 ipv6_mc_destroy_dev(idev);
3677 } else {
3678 ipv6_mc_down(idev);
3679 }
3680
3681 idev->tstamp = jiffies;
3682
3683 /* Last: Shot the device (if unregistered) */
3684 if (how) {
3685 addrconf_sysctl_unregister(idev);
3686 neigh_parms_release(&nd_tbl, idev->nd_parms);
3687 neigh_ifdown(&nd_tbl, dev);
3688 in6_dev_put(idev);
3689 }
3690 return 0;
3691 }
3692
3693 static void addrconf_rs_timer(unsigned long data)
3694 {
3695 struct inet6_dev *idev = (struct inet6_dev *)data;
3696 struct net_device *dev = idev->dev;
3697 struct in6_addr lladdr;
3698
3699 write_lock(&idev->lock);
3700 if (idev->dead || !(idev->if_flags & IF_READY))
3701 goto out;
3702
3703 if (!ipv6_accept_ra(idev))
3704 goto out;
3705
3706 /* Announcement received after solicitation was sent */
3707 if (idev->if_flags & IF_RA_RCVD)
3708 goto out;
3709
3710 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3711 write_unlock(&idev->lock);
3712 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3713 ndisc_send_rs(dev, &lladdr,
3714 &in6addr_linklocal_allrouters);
3715 else
3716 goto put;
3717
3718 write_lock(&idev->lock);
3719 idev->rs_interval = rfc3315_s14_backoff_update(
3720 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3721 /* The wait after the last probe can be shorter */
3722 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3723 idev->cnf.rtr_solicits) ?
3724 idev->cnf.rtr_solicit_delay :
3725 idev->rs_interval);
3726 } else {
3727 /*
3728 * Note: we do not support deprecated "all on-link"
3729 * assumption any longer.
3730 */
3731 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3732 }
3733
3734 out:
3735 write_unlock(&idev->lock);
3736 put:
3737 in6_dev_put(idev);
3738 }
3739
3740 /*
3741 * Duplicate Address Detection
3742 */
3743 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3744 {
3745 unsigned long rand_num;
3746 struct inet6_dev *idev = ifp->idev;
3747 u64 nonce;
3748
3749 if (ifp->flags & IFA_F_OPTIMISTIC)
3750 rand_num = 0;
3751 else
3752 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3753
3754 nonce = 0;
3755 if (idev->cnf.enhanced_dad ||
3756 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3757 do
3758 get_random_bytes(&nonce, 6);
3759 while (nonce == 0);
3760 }
3761 ifp->dad_nonce = nonce;
3762 ifp->dad_probes = idev->cnf.dad_transmits;
3763 addrconf_mod_dad_work(ifp, rand_num);
3764 }
3765
3766 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3767 {
3768 struct inet6_dev *idev = ifp->idev;
3769 struct net_device *dev = idev->dev;
3770 bool bump_id, notify = false;
3771
3772 addrconf_join_solict(dev, &ifp->addr);
3773
3774 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3775
3776 read_lock_bh(&idev->lock);
3777 spin_lock(&ifp->lock);
3778 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3779 goto out;
3780
3781 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3782 idev->cnf.accept_dad < 1 ||
3783 !(ifp->flags&IFA_F_TENTATIVE) ||
3784 ifp->flags & IFA_F_NODAD) {
3785 bump_id = ifp->flags & IFA_F_TENTATIVE;
3786 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3787 spin_unlock(&ifp->lock);
3788 read_unlock_bh(&idev->lock);
3789
3790 addrconf_dad_completed(ifp, bump_id);
3791 return;
3792 }
3793
3794 if (!(idev->if_flags & IF_READY)) {
3795 spin_unlock(&ifp->lock);
3796 read_unlock_bh(&idev->lock);
3797 /*
3798 * If the device is not ready:
3799 * - keep it tentative if it is a permanent address.
3800 * - otherwise, kill it.
3801 */
3802 in6_ifa_hold(ifp);
3803 addrconf_dad_stop(ifp, 0);
3804 return;
3805 }
3806
3807 /*
3808 * Optimistic nodes can start receiving
3809 * Frames right away
3810 */
3811 if (ifp->flags & IFA_F_OPTIMISTIC) {
3812 ip6_ins_rt(ifp->rt);
3813 if (ipv6_use_optimistic_addr(idev)) {
3814 /* Because optimistic nodes can use this address,
3815 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3816 */
3817 notify = true;
3818 }
3819 }
3820
3821 addrconf_dad_kick(ifp);
3822 out:
3823 spin_unlock(&ifp->lock);
3824 read_unlock_bh(&idev->lock);
3825 if (notify)
3826 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3827 }
3828
3829 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3830 {
3831 bool begin_dad = false;
3832
3833 spin_lock_bh(&ifp->lock);
3834 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3835 ifp->state = INET6_IFADDR_STATE_PREDAD;
3836 begin_dad = true;
3837 }
3838 spin_unlock_bh(&ifp->lock);
3839
3840 if (begin_dad)
3841 addrconf_mod_dad_work(ifp, 0);
3842 }
3843
3844 static void addrconf_dad_work(struct work_struct *w)
3845 {
3846 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3847 struct inet6_ifaddr,
3848 dad_work);
3849 struct inet6_dev *idev = ifp->idev;
3850 bool bump_id, disable_ipv6 = false;
3851 struct in6_addr mcaddr;
3852
3853 enum {
3854 DAD_PROCESS,
3855 DAD_BEGIN,
3856 DAD_ABORT,
3857 } action = DAD_PROCESS;
3858
3859 rtnl_lock();
3860
3861 spin_lock_bh(&ifp->lock);
3862 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3863 action = DAD_BEGIN;
3864 ifp->state = INET6_IFADDR_STATE_DAD;
3865 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3866 action = DAD_ABORT;
3867 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3868
3869 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6 &&
3870 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
3871 struct in6_addr addr;
3872
3873 addr.s6_addr32[0] = htonl(0xfe800000);
3874 addr.s6_addr32[1] = 0;
3875
3876 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
3877 ipv6_addr_equal(&ifp->addr, &addr)) {
3878 /* DAD failed for link-local based on MAC */
3879 idev->cnf.disable_ipv6 = 1;
3880
3881 pr_info("%s: IPv6 being disabled!\n",
3882 ifp->idev->dev->name);
3883 disable_ipv6 = true;
3884 }
3885 }
3886 }
3887 spin_unlock_bh(&ifp->lock);
3888
3889 if (action == DAD_BEGIN) {
3890 addrconf_dad_begin(ifp);
3891 goto out;
3892 } else if (action == DAD_ABORT) {
3893 in6_ifa_hold(ifp);
3894 addrconf_dad_stop(ifp, 1);
3895 if (disable_ipv6)
3896 addrconf_ifdown(idev->dev, 0);
3897 goto out;
3898 }
3899
3900 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3901 goto out;
3902
3903 write_lock_bh(&idev->lock);
3904 if (idev->dead || !(idev->if_flags & IF_READY)) {
3905 write_unlock_bh(&idev->lock);
3906 goto out;
3907 }
3908
3909 spin_lock(&ifp->lock);
3910 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3911 spin_unlock(&ifp->lock);
3912 write_unlock_bh(&idev->lock);
3913 goto out;
3914 }
3915
3916 if (ifp->dad_probes == 0) {
3917 /*
3918 * DAD was successful
3919 */
3920
3921 bump_id = ifp->flags & IFA_F_TENTATIVE;
3922 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3923 spin_unlock(&ifp->lock);
3924 write_unlock_bh(&idev->lock);
3925
3926 addrconf_dad_completed(ifp, bump_id);
3927
3928 goto out;
3929 }
3930
3931 ifp->dad_probes--;
3932 addrconf_mod_dad_work(ifp,
3933 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3934 spin_unlock(&ifp->lock);
3935 write_unlock_bh(&idev->lock);
3936
3937 /* send a neighbour solicitation for our addr */
3938 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3939 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
3940 ifp->dad_nonce);
3941 out:
3942 in6_ifa_put(ifp);
3943 rtnl_unlock();
3944 }
3945
3946 /* ifp->idev must be at least read locked */
3947 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3948 {
3949 struct inet6_ifaddr *ifpiter;
3950 struct inet6_dev *idev = ifp->idev;
3951
3952 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3953 if (ifpiter->scope > IFA_LINK)
3954 break;
3955 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3956 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3957 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3958 IFA_F_PERMANENT)
3959 return false;
3960 }
3961 return true;
3962 }
3963
3964 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id)
3965 {
3966 struct net_device *dev = ifp->idev->dev;
3967 struct in6_addr lladdr;
3968 bool send_rs, send_mld;
3969
3970 addrconf_del_dad_work(ifp);
3971
3972 /*
3973 * Configure the address for reception. Now it is valid.
3974 */
3975
3976 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3977
3978 /* If added prefix is link local and we are prepared to process
3979 router advertisements, start sending router solicitations.
3980 */
3981
3982 read_lock_bh(&ifp->idev->lock);
3983 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3984 send_rs = send_mld &&
3985 ipv6_accept_ra(ifp->idev) &&
3986 ifp->idev->cnf.rtr_solicits != 0 &&
3987 (dev->flags&IFF_LOOPBACK) == 0;
3988 read_unlock_bh(&ifp->idev->lock);
3989
3990 /* While dad is in progress mld report's source address is in6_addrany.
3991 * Resend with proper ll now.
3992 */
3993 if (send_mld)
3994 ipv6_mc_dad_complete(ifp->idev);
3995
3996 if (send_rs) {
3997 /*
3998 * If a host as already performed a random delay
3999 * [...] as part of DAD [...] there is no need
4000 * to delay again before sending the first RS
4001 */
4002 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4003 return;
4004 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4005
4006 write_lock_bh(&ifp->idev->lock);
4007 spin_lock(&ifp->lock);
4008 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4009 ifp->idev->cnf.rtr_solicit_interval);
4010 ifp->idev->rs_probes = 1;
4011 ifp->idev->if_flags |= IF_RS_SENT;
4012 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4013 spin_unlock(&ifp->lock);
4014 write_unlock_bh(&ifp->idev->lock);
4015 }
4016
4017 if (bump_id)
4018 rt_genid_bump_ipv6(dev_net(dev));
4019 }
4020
4021 static void addrconf_dad_run(struct inet6_dev *idev)
4022 {
4023 struct inet6_ifaddr *ifp;
4024
4025 read_lock_bh(&idev->lock);
4026 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4027 spin_lock(&ifp->lock);
4028 if (ifp->flags & IFA_F_TENTATIVE &&
4029 ifp->state == INET6_IFADDR_STATE_DAD)
4030 addrconf_dad_kick(ifp);
4031 spin_unlock(&ifp->lock);
4032 }
4033 read_unlock_bh(&idev->lock);
4034 }
4035
4036 #ifdef CONFIG_PROC_FS
4037 struct if6_iter_state {
4038 struct seq_net_private p;
4039 int bucket;
4040 int offset;
4041 };
4042
4043 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4044 {
4045 struct inet6_ifaddr *ifa = NULL;
4046 struct if6_iter_state *state = seq->private;
4047 struct net *net = seq_file_net(seq);
4048 int p = 0;
4049
4050 /* initial bucket if pos is 0 */
4051 if (pos == 0) {
4052 state->bucket = 0;
4053 state->offset = 0;
4054 }
4055
4056 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4057 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
4058 addr_lst) {
4059 if (!net_eq(dev_net(ifa->idev->dev), net))
4060 continue;
4061 /* sync with offset */
4062 if (p < state->offset) {
4063 p++;
4064 continue;
4065 }
4066 state->offset++;
4067 return ifa;
4068 }
4069
4070 /* prepare for next bucket */
4071 state->offset = 0;
4072 p = 0;
4073 }
4074 return NULL;
4075 }
4076
4077 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4078 struct inet6_ifaddr *ifa)
4079 {
4080 struct if6_iter_state *state = seq->private;
4081 struct net *net = seq_file_net(seq);
4082
4083 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
4084 if (!net_eq(dev_net(ifa->idev->dev), net))
4085 continue;
4086 state->offset++;
4087 return ifa;
4088 }
4089
4090 while (++state->bucket < IN6_ADDR_HSIZE) {
4091 state->offset = 0;
4092 hlist_for_each_entry_rcu_bh(ifa,
4093 &inet6_addr_lst[state->bucket], addr_lst) {
4094 if (!net_eq(dev_net(ifa->idev->dev), net))
4095 continue;
4096 state->offset++;
4097 return ifa;
4098 }
4099 }
4100
4101 return NULL;
4102 }
4103
4104 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4105 __acquires(rcu_bh)
4106 {
4107 rcu_read_lock_bh();
4108 return if6_get_first(seq, *pos);
4109 }
4110
4111 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4112 {
4113 struct inet6_ifaddr *ifa;
4114
4115 ifa = if6_get_next(seq, v);
4116 ++*pos;
4117 return ifa;
4118 }
4119
4120 static void if6_seq_stop(struct seq_file *seq, void *v)
4121 __releases(rcu_bh)
4122 {
4123 rcu_read_unlock_bh();
4124 }
4125
4126 static int if6_seq_show(struct seq_file *seq, void *v)
4127 {
4128 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4129 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4130 &ifp->addr,
4131 ifp->idev->dev->ifindex,
4132 ifp->prefix_len,
4133 ifp->scope,
4134 (u8) ifp->flags,
4135 ifp->idev->dev->name);
4136 return 0;
4137 }
4138
4139 static const struct seq_operations if6_seq_ops = {
4140 .start = if6_seq_start,
4141 .next = if6_seq_next,
4142 .show = if6_seq_show,
4143 .stop = if6_seq_stop,
4144 };
4145
4146 static int if6_seq_open(struct inode *inode, struct file *file)
4147 {
4148 return seq_open_net(inode, file, &if6_seq_ops,
4149 sizeof(struct if6_iter_state));
4150 }
4151
4152 static const struct file_operations if6_fops = {
4153 .owner = THIS_MODULE,
4154 .open = if6_seq_open,
4155 .read = seq_read,
4156 .llseek = seq_lseek,
4157 .release = seq_release_net,
4158 };
4159
4160 static int __net_init if6_proc_net_init(struct net *net)
4161 {
4162 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
4163 return -ENOMEM;
4164 return 0;
4165 }
4166
4167 static void __net_exit if6_proc_net_exit(struct net *net)
4168 {
4169 remove_proc_entry("if_inet6", net->proc_net);
4170 }
4171
4172 static struct pernet_operations if6_proc_net_ops = {
4173 .init = if6_proc_net_init,
4174 .exit = if6_proc_net_exit,
4175 };
4176
4177 int __init if6_proc_init(void)
4178 {
4179 return register_pernet_subsys(&if6_proc_net_ops);
4180 }
4181
4182 void if6_proc_exit(void)
4183 {
4184 unregister_pernet_subsys(&if6_proc_net_ops);
4185 }
4186 #endif /* CONFIG_PROC_FS */
4187
4188 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4189 /* Check if address is a home address configured on any interface. */
4190 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4191 {
4192 int ret = 0;
4193 struct inet6_ifaddr *ifp = NULL;
4194 unsigned int hash = inet6_addr_hash(addr);
4195
4196 rcu_read_lock_bh();
4197 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
4198 if (!net_eq(dev_net(ifp->idev->dev), net))
4199 continue;
4200 if (ipv6_addr_equal(&ifp->addr, addr) &&
4201 (ifp->flags & IFA_F_HOMEADDRESS)) {
4202 ret = 1;
4203 break;
4204 }
4205 }
4206 rcu_read_unlock_bh();
4207 return ret;
4208 }
4209 #endif
4210
4211 /*
4212 * Periodic address status verification
4213 */
4214
4215 static void addrconf_verify_rtnl(void)
4216 {
4217 unsigned long now, next, next_sec, next_sched;
4218 struct inet6_ifaddr *ifp;
4219 int i;
4220
4221 ASSERT_RTNL();
4222
4223 rcu_read_lock_bh();
4224 now = jiffies;
4225 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4226
4227 cancel_delayed_work(&addr_chk_work);
4228
4229 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4230 restart:
4231 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4232 unsigned long age;
4233
4234 /* When setting preferred_lft to a value not zero or
4235 * infinity, while valid_lft is infinity
4236 * IFA_F_PERMANENT has a non-infinity life time.
4237 */
4238 if ((ifp->flags & IFA_F_PERMANENT) &&
4239 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4240 continue;
4241
4242 spin_lock(&ifp->lock);
4243 /* We try to batch several events at once. */
4244 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4245
4246 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4247 age >= ifp->valid_lft) {
4248 spin_unlock(&ifp->lock);
4249 in6_ifa_hold(ifp);
4250 ipv6_del_addr(ifp);
4251 goto restart;
4252 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4253 spin_unlock(&ifp->lock);
4254 continue;
4255 } else if (age >= ifp->prefered_lft) {
4256 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4257 int deprecate = 0;
4258
4259 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4260 deprecate = 1;
4261 ifp->flags |= IFA_F_DEPRECATED;
4262 }
4263
4264 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4265 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4266 next = ifp->tstamp + ifp->valid_lft * HZ;
4267
4268 spin_unlock(&ifp->lock);
4269
4270 if (deprecate) {
4271 in6_ifa_hold(ifp);
4272
4273 ipv6_ifa_notify(0, ifp);
4274 in6_ifa_put(ifp);
4275 goto restart;
4276 }
4277 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4278 !(ifp->flags&IFA_F_TENTATIVE)) {
4279 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4280 ifp->idev->cnf.dad_transmits *
4281 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4282
4283 if (age >= ifp->prefered_lft - regen_advance) {
4284 struct inet6_ifaddr *ifpub = ifp->ifpub;
4285 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4286 next = ifp->tstamp + ifp->prefered_lft * HZ;
4287 if (!ifp->regen_count && ifpub) {
4288 ifp->regen_count++;
4289 in6_ifa_hold(ifp);
4290 in6_ifa_hold(ifpub);
4291 spin_unlock(&ifp->lock);
4292
4293 spin_lock(&ifpub->lock);
4294 ifpub->regen_count = 0;
4295 spin_unlock(&ifpub->lock);
4296 ipv6_create_tempaddr(ifpub, ifp);
4297 in6_ifa_put(ifpub);
4298 in6_ifa_put(ifp);
4299 goto restart;
4300 }
4301 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4302 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4303 spin_unlock(&ifp->lock);
4304 } else {
4305 /* ifp->prefered_lft <= ifp->valid_lft */
4306 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4307 next = ifp->tstamp + ifp->prefered_lft * HZ;
4308 spin_unlock(&ifp->lock);
4309 }
4310 }
4311 }
4312
4313 next_sec = round_jiffies_up(next);
4314 next_sched = next;
4315
4316 /* If rounded timeout is accurate enough, accept it. */
4317 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4318 next_sched = next_sec;
4319
4320 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4321 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4322 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4323
4324 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4325 now, next, next_sec, next_sched);
4326 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4327 rcu_read_unlock_bh();
4328 }
4329
4330 static void addrconf_verify_work(struct work_struct *w)
4331 {
4332 rtnl_lock();
4333 addrconf_verify_rtnl();
4334 rtnl_unlock();
4335 }
4336
4337 static void addrconf_verify(void)
4338 {
4339 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4340 }
4341
4342 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4343 struct in6_addr **peer_pfx)
4344 {
4345 struct in6_addr *pfx = NULL;
4346
4347 *peer_pfx = NULL;
4348
4349 if (addr)
4350 pfx = nla_data(addr);
4351
4352 if (local) {
4353 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4354 *peer_pfx = pfx;
4355 pfx = nla_data(local);
4356 }
4357
4358 return pfx;
4359 }
4360
4361 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4362 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4363 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4364 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4365 [IFA_FLAGS] = { .len = sizeof(u32) },
4366 };
4367
4368 static int
4369 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4370 {
4371 struct net *net = sock_net(skb->sk);
4372 struct ifaddrmsg *ifm;
4373 struct nlattr *tb[IFA_MAX+1];
4374 struct in6_addr *pfx, *peer_pfx;
4375 u32 ifa_flags;
4376 int err;
4377
4378 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4379 if (err < 0)
4380 return err;
4381
4382 ifm = nlmsg_data(nlh);
4383 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4384 if (!pfx)
4385 return -EINVAL;
4386
4387 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4388
4389 /* We ignore other flags so far. */
4390 ifa_flags &= IFA_F_MANAGETEMPADDR;
4391
4392 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4393 ifm->ifa_prefixlen);
4394 }
4395
4396 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4397 u32 prefered_lft, u32 valid_lft)
4398 {
4399 u32 flags;
4400 clock_t expires;
4401 unsigned long timeout;
4402 bool was_managetempaddr;
4403 bool had_prefixroute;
4404
4405 ASSERT_RTNL();
4406
4407 if (!valid_lft || (prefered_lft > valid_lft))
4408 return -EINVAL;
4409
4410 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4411 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4412 return -EINVAL;
4413
4414 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4415 if (addrconf_finite_timeout(timeout)) {
4416 expires = jiffies_to_clock_t(timeout * HZ);
4417 valid_lft = timeout;
4418 flags = RTF_EXPIRES;
4419 } else {
4420 expires = 0;
4421 flags = 0;
4422 ifa_flags |= IFA_F_PERMANENT;
4423 }
4424
4425 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4426 if (addrconf_finite_timeout(timeout)) {
4427 if (timeout == 0)
4428 ifa_flags |= IFA_F_DEPRECATED;
4429 prefered_lft = timeout;
4430 }
4431
4432 spin_lock_bh(&ifp->lock);
4433 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4434 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4435 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4436 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4437 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4438 IFA_F_NOPREFIXROUTE);
4439 ifp->flags |= ifa_flags;
4440 ifp->tstamp = jiffies;
4441 ifp->valid_lft = valid_lft;
4442 ifp->prefered_lft = prefered_lft;
4443
4444 spin_unlock_bh(&ifp->lock);
4445 if (!(ifp->flags&IFA_F_TENTATIVE))
4446 ipv6_ifa_notify(0, ifp);
4447
4448 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4449 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4450 expires, flags);
4451 } else if (had_prefixroute) {
4452 enum cleanup_prefix_rt_t action;
4453 unsigned long rt_expires;
4454
4455 write_lock_bh(&ifp->idev->lock);
4456 action = check_cleanup_prefix_route(ifp, &rt_expires);
4457 write_unlock_bh(&ifp->idev->lock);
4458
4459 if (action != CLEANUP_PREFIX_RT_NOP) {
4460 cleanup_prefix_route(ifp, rt_expires,
4461 action == CLEANUP_PREFIX_RT_DEL);
4462 }
4463 }
4464
4465 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4466 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4467 valid_lft = prefered_lft = 0;
4468 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4469 !was_managetempaddr, jiffies);
4470 }
4471
4472 addrconf_verify_rtnl();
4473
4474 return 0;
4475 }
4476
4477 static int
4478 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4479 {
4480 struct net *net = sock_net(skb->sk);
4481 struct ifaddrmsg *ifm;
4482 struct nlattr *tb[IFA_MAX+1];
4483 struct in6_addr *pfx, *peer_pfx;
4484 struct inet6_ifaddr *ifa;
4485 struct net_device *dev;
4486 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4487 u32 ifa_flags;
4488 int err;
4489
4490 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4491 if (err < 0)
4492 return err;
4493
4494 ifm = nlmsg_data(nlh);
4495 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4496 if (!pfx)
4497 return -EINVAL;
4498
4499 if (tb[IFA_CACHEINFO]) {
4500 struct ifa_cacheinfo *ci;
4501
4502 ci = nla_data(tb[IFA_CACHEINFO]);
4503 valid_lft = ci->ifa_valid;
4504 preferred_lft = ci->ifa_prefered;
4505 } else {
4506 preferred_lft = INFINITY_LIFE_TIME;
4507 valid_lft = INFINITY_LIFE_TIME;
4508 }
4509
4510 dev = __dev_get_by_index(net, ifm->ifa_index);
4511 if (!dev)
4512 return -ENODEV;
4513
4514 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4515
4516 /* We ignore other flags so far. */
4517 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4518 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4519
4520 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4521 if (!ifa) {
4522 /*
4523 * It would be best to check for !NLM_F_CREATE here but
4524 * userspace already relies on not having to provide this.
4525 */
4526 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4527 ifm->ifa_prefixlen, ifa_flags,
4528 preferred_lft, valid_lft);
4529 }
4530
4531 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4532 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4533 err = -EEXIST;
4534 else
4535 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4536
4537 in6_ifa_put(ifa);
4538
4539 return err;
4540 }
4541
4542 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4543 u8 scope, int ifindex)
4544 {
4545 struct ifaddrmsg *ifm;
4546
4547 ifm = nlmsg_data(nlh);
4548 ifm->ifa_family = AF_INET6;
4549 ifm->ifa_prefixlen = prefixlen;
4550 ifm->ifa_flags = flags;
4551 ifm->ifa_scope = scope;
4552 ifm->ifa_index = ifindex;
4553 }
4554
4555 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4556 unsigned long tstamp, u32 preferred, u32 valid)
4557 {
4558 struct ifa_cacheinfo ci;
4559
4560 ci.cstamp = cstamp_delta(cstamp);
4561 ci.tstamp = cstamp_delta(tstamp);
4562 ci.ifa_prefered = preferred;
4563 ci.ifa_valid = valid;
4564
4565 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4566 }
4567
4568 static inline int rt_scope(int ifa_scope)
4569 {
4570 if (ifa_scope & IFA_HOST)
4571 return RT_SCOPE_HOST;
4572 else if (ifa_scope & IFA_LINK)
4573 return RT_SCOPE_LINK;
4574 else if (ifa_scope & IFA_SITE)
4575 return RT_SCOPE_SITE;
4576 else
4577 return RT_SCOPE_UNIVERSE;
4578 }
4579
4580 static inline int inet6_ifaddr_msgsize(void)
4581 {
4582 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4583 + nla_total_size(16) /* IFA_LOCAL */
4584 + nla_total_size(16) /* IFA_ADDRESS */
4585 + nla_total_size(sizeof(struct ifa_cacheinfo))
4586 + nla_total_size(4) /* IFA_FLAGS */;
4587 }
4588
4589 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4590 u32 portid, u32 seq, int event, unsigned int flags)
4591 {
4592 struct nlmsghdr *nlh;
4593 u32 preferred, valid;
4594
4595 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4596 if (!nlh)
4597 return -EMSGSIZE;
4598
4599 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4600 ifa->idev->dev->ifindex);
4601
4602 if (!((ifa->flags&IFA_F_PERMANENT) &&
4603 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4604 preferred = ifa->prefered_lft;
4605 valid = ifa->valid_lft;
4606 if (preferred != INFINITY_LIFE_TIME) {
4607 long tval = (jiffies - ifa->tstamp)/HZ;
4608 if (preferred > tval)
4609 preferred -= tval;
4610 else
4611 preferred = 0;
4612 if (valid != INFINITY_LIFE_TIME) {
4613 if (valid > tval)
4614 valid -= tval;
4615 else
4616 valid = 0;
4617 }
4618 }
4619 } else {
4620 preferred = INFINITY_LIFE_TIME;
4621 valid = INFINITY_LIFE_TIME;
4622 }
4623
4624 if (!ipv6_addr_any(&ifa->peer_addr)) {
4625 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4626 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4627 goto error;
4628 } else
4629 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4630 goto error;
4631
4632 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4633 goto error;
4634
4635 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4636 goto error;
4637
4638 nlmsg_end(skb, nlh);
4639 return 0;
4640
4641 error:
4642 nlmsg_cancel(skb, nlh);
4643 return -EMSGSIZE;
4644 }
4645
4646 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4647 u32 portid, u32 seq, int event, u16 flags)
4648 {
4649 struct nlmsghdr *nlh;
4650 u8 scope = RT_SCOPE_UNIVERSE;
4651 int ifindex = ifmca->idev->dev->ifindex;
4652
4653 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4654 scope = RT_SCOPE_SITE;
4655
4656 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4657 if (!nlh)
4658 return -EMSGSIZE;
4659
4660 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4661 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4662 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4663 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4664 nlmsg_cancel(skb, nlh);
4665 return -EMSGSIZE;
4666 }
4667
4668 nlmsg_end(skb, nlh);
4669 return 0;
4670 }
4671
4672 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4673 u32 portid, u32 seq, int event, unsigned int flags)
4674 {
4675 struct nlmsghdr *nlh;
4676 u8 scope = RT_SCOPE_UNIVERSE;
4677 int ifindex = ifaca->aca_idev->dev->ifindex;
4678
4679 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4680 scope = RT_SCOPE_SITE;
4681
4682 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4683 if (!nlh)
4684 return -EMSGSIZE;
4685
4686 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4687 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4688 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4689 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4690 nlmsg_cancel(skb, nlh);
4691 return -EMSGSIZE;
4692 }
4693
4694 nlmsg_end(skb, nlh);
4695 return 0;
4696 }
4697
4698 enum addr_type_t {
4699 UNICAST_ADDR,
4700 MULTICAST_ADDR,
4701 ANYCAST_ADDR,
4702 };
4703
4704 /* called with rcu_read_lock() */
4705 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4706 struct netlink_callback *cb, enum addr_type_t type,
4707 int s_ip_idx, int *p_ip_idx)
4708 {
4709 struct ifmcaddr6 *ifmca;
4710 struct ifacaddr6 *ifaca;
4711 int err = 1;
4712 int ip_idx = *p_ip_idx;
4713
4714 read_lock_bh(&idev->lock);
4715 switch (type) {
4716 case UNICAST_ADDR: {
4717 struct inet6_ifaddr *ifa;
4718
4719 /* unicast address incl. temp addr */
4720 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4721 if (++ip_idx < s_ip_idx)
4722 continue;
4723 err = inet6_fill_ifaddr(skb, ifa,
4724 NETLINK_CB(cb->skb).portid,
4725 cb->nlh->nlmsg_seq,
4726 RTM_NEWADDR,
4727 NLM_F_MULTI);
4728 if (err < 0)
4729 break;
4730 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4731 }
4732 break;
4733 }
4734 case MULTICAST_ADDR:
4735 /* multicast address */
4736 for (ifmca = idev->mc_list; ifmca;
4737 ifmca = ifmca->next, ip_idx++) {
4738 if (ip_idx < s_ip_idx)
4739 continue;
4740 err = inet6_fill_ifmcaddr(skb, ifmca,
4741 NETLINK_CB(cb->skb).portid,
4742 cb->nlh->nlmsg_seq,
4743 RTM_GETMULTICAST,
4744 NLM_F_MULTI);
4745 if (err < 0)
4746 break;
4747 }
4748 break;
4749 case ANYCAST_ADDR:
4750 /* anycast address */
4751 for (ifaca = idev->ac_list; ifaca;
4752 ifaca = ifaca->aca_next, ip_idx++) {
4753 if (ip_idx < s_ip_idx)
4754 continue;
4755 err = inet6_fill_ifacaddr(skb, ifaca,
4756 NETLINK_CB(cb->skb).portid,
4757 cb->nlh->nlmsg_seq,
4758 RTM_GETANYCAST,
4759 NLM_F_MULTI);
4760 if (err < 0)
4761 break;
4762 }
4763 break;
4764 default:
4765 break;
4766 }
4767 read_unlock_bh(&idev->lock);
4768 *p_ip_idx = ip_idx;
4769 return err;
4770 }
4771
4772 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4773 enum addr_type_t type)
4774 {
4775 struct net *net = sock_net(skb->sk);
4776 int h, s_h;
4777 int idx, ip_idx;
4778 int s_idx, s_ip_idx;
4779 struct net_device *dev;
4780 struct inet6_dev *idev;
4781 struct hlist_head *head;
4782
4783 s_h = cb->args[0];
4784 s_idx = idx = cb->args[1];
4785 s_ip_idx = ip_idx = cb->args[2];
4786
4787 rcu_read_lock();
4788 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4789 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4790 idx = 0;
4791 head = &net->dev_index_head[h];
4792 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4793 if (idx < s_idx)
4794 goto cont;
4795 if (h > s_h || idx > s_idx)
4796 s_ip_idx = 0;
4797 ip_idx = 0;
4798 idev = __in6_dev_get(dev);
4799 if (!idev)
4800 goto cont;
4801
4802 if (in6_dump_addrs(idev, skb, cb, type,
4803 s_ip_idx, &ip_idx) < 0)
4804 goto done;
4805 cont:
4806 idx++;
4807 }
4808 }
4809 done:
4810 rcu_read_unlock();
4811 cb->args[0] = h;
4812 cb->args[1] = idx;
4813 cb->args[2] = ip_idx;
4814
4815 return skb->len;
4816 }
4817
4818 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4819 {
4820 enum addr_type_t type = UNICAST_ADDR;
4821
4822 return inet6_dump_addr(skb, cb, type);
4823 }
4824
4825 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4826 {
4827 enum addr_type_t type = MULTICAST_ADDR;
4828
4829 return inet6_dump_addr(skb, cb, type);
4830 }
4831
4832
4833 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4834 {
4835 enum addr_type_t type = ANYCAST_ADDR;
4836
4837 return inet6_dump_addr(skb, cb, type);
4838 }
4839
4840 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4841 {
4842 struct net *net = sock_net(in_skb->sk);
4843 struct ifaddrmsg *ifm;
4844 struct nlattr *tb[IFA_MAX+1];
4845 struct in6_addr *addr = NULL, *peer;
4846 struct net_device *dev = NULL;
4847 struct inet6_ifaddr *ifa;
4848 struct sk_buff *skb;
4849 int err;
4850
4851 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4852 if (err < 0)
4853 goto errout;
4854
4855 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4856 if (!addr) {
4857 err = -EINVAL;
4858 goto errout;
4859 }
4860
4861 ifm = nlmsg_data(nlh);
4862 if (ifm->ifa_index)
4863 dev = __dev_get_by_index(net, ifm->ifa_index);
4864
4865 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4866 if (!ifa) {
4867 err = -EADDRNOTAVAIL;
4868 goto errout;
4869 }
4870
4871 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4872 if (!skb) {
4873 err = -ENOBUFS;
4874 goto errout_ifa;
4875 }
4876
4877 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4878 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4879 if (err < 0) {
4880 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4881 WARN_ON(err == -EMSGSIZE);
4882 kfree_skb(skb);
4883 goto errout_ifa;
4884 }
4885 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4886 errout_ifa:
4887 in6_ifa_put(ifa);
4888 errout:
4889 return err;
4890 }
4891
4892 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4893 {
4894 struct sk_buff *skb;
4895 struct net *net = dev_net(ifa->idev->dev);
4896 int err = -ENOBUFS;
4897
4898 /* Don't send DELADDR notification for TENTATIVE address,
4899 * since NEWADDR notification is sent only after removing
4900 * TENTATIVE flag.
4901 */
4902 if (ifa->flags & IFA_F_TENTATIVE && event == RTM_DELADDR)
4903 return;
4904
4905 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4906 if (!skb)
4907 goto errout;
4908
4909 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4910 if (err < 0) {
4911 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4912 WARN_ON(err == -EMSGSIZE);
4913 kfree_skb(skb);
4914 goto errout;
4915 }
4916 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4917 return;
4918 errout:
4919 if (err < 0)
4920 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4921 }
4922
4923 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4924 __s32 *array, int bytes)
4925 {
4926 BUG_ON(bytes < (DEVCONF_MAX * 4));
4927
4928 memset(array, 0, bytes);
4929 array[DEVCONF_FORWARDING] = cnf->forwarding;
4930 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4931 array[DEVCONF_MTU6] = cnf->mtu6;
4932 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4933 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4934 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4935 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4936 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4937 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4938 jiffies_to_msecs(cnf->rtr_solicit_interval);
4939 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
4940 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
4941 array[DEVCONF_RTR_SOLICIT_DELAY] =
4942 jiffies_to_msecs(cnf->rtr_solicit_delay);
4943 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4944 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4945 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4946 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4947 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4948 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4949 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4950 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4951 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4952 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4953 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4954 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4955 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4956 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4957 #ifdef CONFIG_IPV6_ROUTER_PREF
4958 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4959 array[DEVCONF_RTR_PROBE_INTERVAL] =
4960 jiffies_to_msecs(cnf->rtr_probe_interval);
4961 #ifdef CONFIG_IPV6_ROUTE_INFO
4962 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4963 #endif
4964 #endif
4965 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4966 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4967 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4968 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4969 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4970 #endif
4971 #ifdef CONFIG_IPV6_MROUTE
4972 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4973 #endif
4974 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4975 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4976 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4977 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4978 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4979 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4980 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4981 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4982 /* we omit DEVCONF_STABLE_SECRET for now */
4983 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4984 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
4985 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
4986 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
4987 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
4988 #ifdef CONFIG_IPV6_SEG6_HMAC
4989 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
4990 #endif
4991 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
4992 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
4993 }
4994
4995 static inline size_t inet6_ifla6_size(void)
4996 {
4997 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4998 + nla_total_size(sizeof(struct ifla_cacheinfo))
4999 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5000 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5001 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5002 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
5003 }
5004
5005 static inline size_t inet6_if_nlmsg_size(void)
5006 {
5007 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5008 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5009 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5010 + nla_total_size(4) /* IFLA_MTU */
5011 + nla_total_size(4) /* IFLA_LINK */
5012 + nla_total_size(1) /* IFLA_OPERSTATE */
5013 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5014 }
5015
5016 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5017 int bytes)
5018 {
5019 int i;
5020 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5021 BUG_ON(pad < 0);
5022
5023 /* Use put_unaligned() because stats may not be aligned for u64. */
5024 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5025 for (i = 1; i < ICMP6_MIB_MAX; i++)
5026 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5027
5028 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5029 }
5030
5031 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5032 int bytes, size_t syncpoff)
5033 {
5034 int i, c;
5035 u64 buff[IPSTATS_MIB_MAX];
5036 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5037
5038 BUG_ON(pad < 0);
5039
5040 memset(buff, 0, sizeof(buff));
5041 buff[0] = IPSTATS_MIB_MAX;
5042
5043 for_each_possible_cpu(c) {
5044 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5045 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5046 }
5047
5048 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5049 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5050 }
5051
5052 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5053 int bytes)
5054 {
5055 switch (attrtype) {
5056 case IFLA_INET6_STATS:
5057 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5058 offsetof(struct ipstats_mib, syncp));
5059 break;
5060 case IFLA_INET6_ICMP6STATS:
5061 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5062 break;
5063 }
5064 }
5065
5066 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5067 u32 ext_filter_mask)
5068 {
5069 struct nlattr *nla;
5070 struct ifla_cacheinfo ci;
5071
5072 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5073 goto nla_put_failure;
5074 ci.max_reasm_len = IPV6_MAXPLEN;
5075 ci.tstamp = cstamp_delta(idev->tstamp);
5076 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5077 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5078 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5079 goto nla_put_failure;
5080 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5081 if (!nla)
5082 goto nla_put_failure;
5083 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5084
5085 /* XXX - MC not implemented */
5086
5087 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5088 return 0;
5089
5090 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5091 if (!nla)
5092 goto nla_put_failure;
5093 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5094
5095 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5096 if (!nla)
5097 goto nla_put_failure;
5098 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5099
5100 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5101 if (!nla)
5102 goto nla_put_failure;
5103
5104 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5105 goto nla_put_failure;
5106
5107 read_lock_bh(&idev->lock);
5108 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5109 read_unlock_bh(&idev->lock);
5110
5111 return 0;
5112
5113 nla_put_failure:
5114 return -EMSGSIZE;
5115 }
5116
5117 static size_t inet6_get_link_af_size(const struct net_device *dev,
5118 u32 ext_filter_mask)
5119 {
5120 if (!__in6_dev_get(dev))
5121 return 0;
5122
5123 return inet6_ifla6_size();
5124 }
5125
5126 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5127 u32 ext_filter_mask)
5128 {
5129 struct inet6_dev *idev = __in6_dev_get(dev);
5130
5131 if (!idev)
5132 return -ENODATA;
5133
5134 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5135 return -EMSGSIZE;
5136
5137 return 0;
5138 }
5139
5140 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5141 {
5142 struct inet6_ifaddr *ifp;
5143 struct net_device *dev = idev->dev;
5144 bool clear_token, update_rs = false;
5145 struct in6_addr ll_addr;
5146
5147 ASSERT_RTNL();
5148
5149 if (!token)
5150 return -EINVAL;
5151 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5152 return -EINVAL;
5153 if (!ipv6_accept_ra(idev))
5154 return -EINVAL;
5155 if (idev->cnf.rtr_solicits == 0)
5156 return -EINVAL;
5157
5158 write_lock_bh(&idev->lock);
5159
5160 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5161 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5162
5163 write_unlock_bh(&idev->lock);
5164
5165 clear_token = ipv6_addr_any(token);
5166 if (clear_token)
5167 goto update_lft;
5168
5169 if (!idev->dead && (idev->if_flags & IF_READY) &&
5170 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5171 IFA_F_OPTIMISTIC)) {
5172 /* If we're not ready, then normal ifup will take care
5173 * of this. Otherwise, we need to request our rs here.
5174 */
5175 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5176 update_rs = true;
5177 }
5178
5179 update_lft:
5180 write_lock_bh(&idev->lock);
5181
5182 if (update_rs) {
5183 idev->if_flags |= IF_RS_SENT;
5184 idev->rs_interval = rfc3315_s14_backoff_init(
5185 idev->cnf.rtr_solicit_interval);
5186 idev->rs_probes = 1;
5187 addrconf_mod_rs_timer(idev, idev->rs_interval);
5188 }
5189
5190 /* Well, that's kinda nasty ... */
5191 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5192 spin_lock(&ifp->lock);
5193 if (ifp->tokenized) {
5194 ifp->valid_lft = 0;
5195 ifp->prefered_lft = 0;
5196 }
5197 spin_unlock(&ifp->lock);
5198 }
5199
5200 write_unlock_bh(&idev->lock);
5201 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5202 addrconf_verify_rtnl();
5203 return 0;
5204 }
5205
5206 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5207 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5208 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5209 };
5210
5211 static int inet6_validate_link_af(const struct net_device *dev,
5212 const struct nlattr *nla)
5213 {
5214 struct nlattr *tb[IFLA_INET6_MAX + 1];
5215
5216 if (dev && !__in6_dev_get(dev))
5217 return -EAFNOSUPPORT;
5218
5219 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
5220 }
5221
5222 static int check_addr_gen_mode(int mode)
5223 {
5224 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5225 mode != IN6_ADDR_GEN_MODE_NONE &&
5226 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5227 mode != IN6_ADDR_GEN_MODE_RANDOM)
5228 return -EINVAL;
5229 return 1;
5230 }
5231
5232 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5233 int mode)
5234 {
5235 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5236 !idev->cnf.stable_secret.initialized &&
5237 !net->ipv6.devconf_dflt->stable_secret.initialized)
5238 return -EINVAL;
5239 return 1;
5240 }
5241
5242 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5243 {
5244 int err = -EINVAL;
5245 struct inet6_dev *idev = __in6_dev_get(dev);
5246 struct nlattr *tb[IFLA_INET6_MAX + 1];
5247
5248 if (!idev)
5249 return -EAFNOSUPPORT;
5250
5251 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
5252 BUG();
5253
5254 if (tb[IFLA_INET6_TOKEN]) {
5255 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5256 if (err)
5257 return err;
5258 }
5259
5260 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5261 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5262
5263 if (check_addr_gen_mode(mode) < 0 ||
5264 check_stable_privacy(idev, dev_net(dev), mode) < 0)
5265 return -EINVAL;
5266
5267 idev->cnf.addr_gen_mode = mode;
5268 err = 0;
5269 }
5270
5271 return err;
5272 }
5273
5274 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5275 u32 portid, u32 seq, int event, unsigned int flags)
5276 {
5277 struct net_device *dev = idev->dev;
5278 struct ifinfomsg *hdr;
5279 struct nlmsghdr *nlh;
5280 void *protoinfo;
5281
5282 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5283 if (!nlh)
5284 return -EMSGSIZE;
5285
5286 hdr = nlmsg_data(nlh);
5287 hdr->ifi_family = AF_INET6;
5288 hdr->__ifi_pad = 0;
5289 hdr->ifi_type = dev->type;
5290 hdr->ifi_index = dev->ifindex;
5291 hdr->ifi_flags = dev_get_flags(dev);
5292 hdr->ifi_change = 0;
5293
5294 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5295 (dev->addr_len &&
5296 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5297 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5298 (dev->ifindex != dev_get_iflink(dev) &&
5299 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5300 nla_put_u8(skb, IFLA_OPERSTATE,
5301 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5302 goto nla_put_failure;
5303 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
5304 if (!protoinfo)
5305 goto nla_put_failure;
5306
5307 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5308 goto nla_put_failure;
5309
5310 nla_nest_end(skb, protoinfo);
5311 nlmsg_end(skb, nlh);
5312 return 0;
5313
5314 nla_put_failure:
5315 nlmsg_cancel(skb, nlh);
5316 return -EMSGSIZE;
5317 }
5318
5319 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5320 {
5321 struct net *net = sock_net(skb->sk);
5322 int h, s_h;
5323 int idx = 0, s_idx;
5324 struct net_device *dev;
5325 struct inet6_dev *idev;
5326 struct hlist_head *head;
5327
5328 s_h = cb->args[0];
5329 s_idx = cb->args[1];
5330
5331 rcu_read_lock();
5332 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5333 idx = 0;
5334 head = &net->dev_index_head[h];
5335 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5336 if (idx < s_idx)
5337 goto cont;
5338 idev = __in6_dev_get(dev);
5339 if (!idev)
5340 goto cont;
5341 if (inet6_fill_ifinfo(skb, idev,
5342 NETLINK_CB(cb->skb).portid,
5343 cb->nlh->nlmsg_seq,
5344 RTM_NEWLINK, NLM_F_MULTI) < 0)
5345 goto out;
5346 cont:
5347 idx++;
5348 }
5349 }
5350 out:
5351 rcu_read_unlock();
5352 cb->args[1] = idx;
5353 cb->args[0] = h;
5354
5355 return skb->len;
5356 }
5357
5358 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5359 {
5360 struct sk_buff *skb;
5361 struct net *net = dev_net(idev->dev);
5362 int err = -ENOBUFS;
5363
5364 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5365 if (!skb)
5366 goto errout;
5367
5368 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5369 if (err < 0) {
5370 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5371 WARN_ON(err == -EMSGSIZE);
5372 kfree_skb(skb);
5373 goto errout;
5374 }
5375 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5376 return;
5377 errout:
5378 if (err < 0)
5379 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5380 }
5381
5382 static inline size_t inet6_prefix_nlmsg_size(void)
5383 {
5384 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5385 + nla_total_size(sizeof(struct in6_addr))
5386 + nla_total_size(sizeof(struct prefix_cacheinfo));
5387 }
5388
5389 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5390 struct prefix_info *pinfo, u32 portid, u32 seq,
5391 int event, unsigned int flags)
5392 {
5393 struct prefixmsg *pmsg;
5394 struct nlmsghdr *nlh;
5395 struct prefix_cacheinfo ci;
5396
5397 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5398 if (!nlh)
5399 return -EMSGSIZE;
5400
5401 pmsg = nlmsg_data(nlh);
5402 pmsg->prefix_family = AF_INET6;
5403 pmsg->prefix_pad1 = 0;
5404 pmsg->prefix_pad2 = 0;
5405 pmsg->prefix_ifindex = idev->dev->ifindex;
5406 pmsg->prefix_len = pinfo->prefix_len;
5407 pmsg->prefix_type = pinfo->type;
5408 pmsg->prefix_pad3 = 0;
5409 pmsg->prefix_flags = 0;
5410 if (pinfo->onlink)
5411 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5412 if (pinfo->autoconf)
5413 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5414
5415 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5416 goto nla_put_failure;
5417 ci.preferred_time = ntohl(pinfo->prefered);
5418 ci.valid_time = ntohl(pinfo->valid);
5419 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5420 goto nla_put_failure;
5421 nlmsg_end(skb, nlh);
5422 return 0;
5423
5424 nla_put_failure:
5425 nlmsg_cancel(skb, nlh);
5426 return -EMSGSIZE;
5427 }
5428
5429 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5430 struct prefix_info *pinfo)
5431 {
5432 struct sk_buff *skb;
5433 struct net *net = dev_net(idev->dev);
5434 int err = -ENOBUFS;
5435
5436 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5437 if (!skb)
5438 goto errout;
5439
5440 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5441 if (err < 0) {
5442 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5443 WARN_ON(err == -EMSGSIZE);
5444 kfree_skb(skb);
5445 goto errout;
5446 }
5447 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5448 return;
5449 errout:
5450 if (err < 0)
5451 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5452 }
5453
5454 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5455 {
5456 struct net *net = dev_net(ifp->idev->dev);
5457
5458 if (event)
5459 ASSERT_RTNL();
5460
5461 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5462
5463 switch (event) {
5464 case RTM_NEWADDR:
5465 /*
5466 * If the address was optimistic
5467 * we inserted the route at the start of
5468 * our DAD process, so we don't need
5469 * to do it again
5470 */
5471 if (!(ifp->rt->rt6i_node))
5472 ip6_ins_rt(ifp->rt);
5473 if (ifp->idev->cnf.forwarding)
5474 addrconf_join_anycast(ifp);
5475 if (!ipv6_addr_any(&ifp->peer_addr))
5476 addrconf_prefix_route(&ifp->peer_addr, 128,
5477 ifp->idev->dev, 0, 0);
5478 break;
5479 case RTM_DELADDR:
5480 if (ifp->idev->cnf.forwarding)
5481 addrconf_leave_anycast(ifp);
5482 addrconf_leave_solict(ifp->idev, &ifp->addr);
5483 if (!ipv6_addr_any(&ifp->peer_addr)) {
5484 struct rt6_info *rt;
5485
5486 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5487 ifp->idev->dev, 0, 0);
5488 if (rt)
5489 ip6_del_rt(rt);
5490 }
5491 if (ifp->rt) {
5492 dst_hold(&ifp->rt->dst);
5493 ip6_del_rt(ifp->rt);
5494 }
5495 rt_genid_bump_ipv6(net);
5496 break;
5497 }
5498 atomic_inc(&net->ipv6.dev_addr_genid);
5499 }
5500
5501 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5502 {
5503 rcu_read_lock_bh();
5504 if (likely(ifp->idev->dead == 0))
5505 __ipv6_ifa_notify(event, ifp);
5506 rcu_read_unlock_bh();
5507 }
5508
5509 #ifdef CONFIG_SYSCTL
5510
5511 static
5512 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5513 void __user *buffer, size_t *lenp, loff_t *ppos)
5514 {
5515 int *valp = ctl->data;
5516 int val = *valp;
5517 loff_t pos = *ppos;
5518 struct ctl_table lctl;
5519 int ret;
5520
5521 /*
5522 * ctl->data points to idev->cnf.forwarding, we should
5523 * not modify it until we get the rtnl lock.
5524 */
5525 lctl = *ctl;
5526 lctl.data = &val;
5527
5528 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5529
5530 if (write)
5531 ret = addrconf_fixup_forwarding(ctl, valp, val);
5532 if (ret)
5533 *ppos = pos;
5534 return ret;
5535 }
5536
5537 static
5538 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5539 void __user *buffer, size_t *lenp, loff_t *ppos)
5540 {
5541 struct inet6_dev *idev = ctl->extra1;
5542 int min_mtu = IPV6_MIN_MTU;
5543 struct ctl_table lctl;
5544
5545 lctl = *ctl;
5546 lctl.extra1 = &min_mtu;
5547 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5548
5549 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5550 }
5551
5552 static void dev_disable_change(struct inet6_dev *idev)
5553 {
5554 struct netdev_notifier_info info;
5555
5556 if (!idev || !idev->dev)
5557 return;
5558
5559 netdev_notifier_info_init(&info, idev->dev);
5560 if (idev->cnf.disable_ipv6)
5561 addrconf_notify(NULL, NETDEV_DOWN, &info);
5562 else
5563 addrconf_notify(NULL, NETDEV_UP, &info);
5564 }
5565
5566 static void addrconf_disable_change(struct net *net, __s32 newf)
5567 {
5568 struct net_device *dev;
5569 struct inet6_dev *idev;
5570
5571 for_each_netdev(net, dev) {
5572 idev = __in6_dev_get(dev);
5573 if (idev) {
5574 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5575 idev->cnf.disable_ipv6 = newf;
5576 if (changed)
5577 dev_disable_change(idev);
5578 }
5579 }
5580 }
5581
5582 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5583 {
5584 struct net *net;
5585 int old;
5586
5587 if (!rtnl_trylock())
5588 return restart_syscall();
5589
5590 net = (struct net *)table->extra2;
5591 old = *p;
5592 *p = newf;
5593
5594 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5595 rtnl_unlock();
5596 return 0;
5597 }
5598
5599 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5600 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5601 addrconf_disable_change(net, newf);
5602 } else if ((!newf) ^ (!old))
5603 dev_disable_change((struct inet6_dev *)table->extra1);
5604
5605 rtnl_unlock();
5606 return 0;
5607 }
5608
5609 static
5610 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5611 void __user *buffer, size_t *lenp, loff_t *ppos)
5612 {
5613 int *valp = ctl->data;
5614 int val = *valp;
5615 loff_t pos = *ppos;
5616 struct ctl_table lctl;
5617 int ret;
5618
5619 /*
5620 * ctl->data points to idev->cnf.disable_ipv6, we should
5621 * not modify it until we get the rtnl lock.
5622 */
5623 lctl = *ctl;
5624 lctl.data = &val;
5625
5626 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5627
5628 if (write)
5629 ret = addrconf_disable_ipv6(ctl, valp, val);
5630 if (ret)
5631 *ppos = pos;
5632 return ret;
5633 }
5634
5635 static
5636 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5637 void __user *buffer, size_t *lenp, loff_t *ppos)
5638 {
5639 int *valp = ctl->data;
5640 int ret;
5641 int old, new;
5642
5643 old = *valp;
5644 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5645 new = *valp;
5646
5647 if (write && old != new) {
5648 struct net *net = ctl->extra2;
5649
5650 if (!rtnl_trylock())
5651 return restart_syscall();
5652
5653 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5654 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5655 NETCONFA_IFINDEX_DEFAULT,
5656 net->ipv6.devconf_dflt);
5657 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5658 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5659 NETCONFA_IFINDEX_ALL,
5660 net->ipv6.devconf_all);
5661 else {
5662 struct inet6_dev *idev = ctl->extra1;
5663
5664 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5665 idev->dev->ifindex,
5666 &idev->cnf);
5667 }
5668 rtnl_unlock();
5669 }
5670
5671 return ret;
5672 }
5673
5674 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
5675 void __user *buffer, size_t *lenp,
5676 loff_t *ppos)
5677 {
5678 int ret = 0;
5679 int new_val;
5680 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
5681 struct net *net = (struct net *)ctl->extra2;
5682
5683 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5684
5685 if (write) {
5686 new_val = *((int *)ctl->data);
5687
5688 if (check_addr_gen_mode(new_val) < 0)
5689 return -EINVAL;
5690
5691 /* request for default */
5692 if (&net->ipv6.devconf_dflt->addr_gen_mode == ctl->data) {
5693 ipv6_devconf_dflt.addr_gen_mode = new_val;
5694
5695 /* request for individual net device */
5696 } else {
5697 if (!idev)
5698 return ret;
5699
5700 if (check_stable_privacy(idev, net, new_val) < 0)
5701 return -EINVAL;
5702
5703 if (idev->cnf.addr_gen_mode != new_val) {
5704 idev->cnf.addr_gen_mode = new_val;
5705 rtnl_lock();
5706 addrconf_dev_config(idev->dev);
5707 rtnl_unlock();
5708 }
5709 }
5710 }
5711
5712 return ret;
5713 }
5714
5715 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5716 void __user *buffer, size_t *lenp,
5717 loff_t *ppos)
5718 {
5719 int err;
5720 struct in6_addr addr;
5721 char str[IPV6_MAX_STRLEN];
5722 struct ctl_table lctl = *ctl;
5723 struct net *net = ctl->extra2;
5724 struct ipv6_stable_secret *secret = ctl->data;
5725
5726 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5727 return -EIO;
5728
5729 lctl.maxlen = IPV6_MAX_STRLEN;
5730 lctl.data = str;
5731
5732 if (!rtnl_trylock())
5733 return restart_syscall();
5734
5735 if (!write && !secret->initialized) {
5736 err = -EIO;
5737 goto out;
5738 }
5739
5740 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5741 if (err >= sizeof(str)) {
5742 err = -EIO;
5743 goto out;
5744 }
5745
5746 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5747 if (err || !write)
5748 goto out;
5749
5750 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5751 err = -EIO;
5752 goto out;
5753 }
5754
5755 secret->initialized = true;
5756 secret->secret = addr;
5757
5758 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5759 struct net_device *dev;
5760
5761 for_each_netdev(net, dev) {
5762 struct inet6_dev *idev = __in6_dev_get(dev);
5763
5764 if (idev) {
5765 idev->cnf.addr_gen_mode =
5766 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5767 }
5768 }
5769 } else {
5770 struct inet6_dev *idev = ctl->extra1;
5771
5772 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5773 }
5774
5775 out:
5776 rtnl_unlock();
5777
5778 return err;
5779 }
5780
5781 static
5782 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5783 int write,
5784 void __user *buffer,
5785 size_t *lenp,
5786 loff_t *ppos)
5787 {
5788 int *valp = ctl->data;
5789 int val = *valp;
5790 loff_t pos = *ppos;
5791 struct ctl_table lctl;
5792 int ret;
5793
5794 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5795 * we should not modify it until we get the rtnl lock.
5796 */
5797 lctl = *ctl;
5798 lctl.data = &val;
5799
5800 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5801
5802 if (write)
5803 ret = addrconf_fixup_linkdown(ctl, valp, val);
5804 if (ret)
5805 *ppos = pos;
5806 return ret;
5807 }
5808
5809 static int minus_one = -1;
5810 static const int one = 1;
5811 static const int two_five_five = 255;
5812
5813 static const struct ctl_table addrconf_sysctl[] = {
5814 {
5815 .procname = "forwarding",
5816 .data = &ipv6_devconf.forwarding,
5817 .maxlen = sizeof(int),
5818 .mode = 0644,
5819 .proc_handler = addrconf_sysctl_forward,
5820 },
5821 {
5822 .procname = "hop_limit",
5823 .data = &ipv6_devconf.hop_limit,
5824 .maxlen = sizeof(int),
5825 .mode = 0644,
5826 .proc_handler = proc_dointvec_minmax,
5827 .extra1 = (void *)&one,
5828 .extra2 = (void *)&two_five_five,
5829 },
5830 {
5831 .procname = "mtu",
5832 .data = &ipv6_devconf.mtu6,
5833 .maxlen = sizeof(int),
5834 .mode = 0644,
5835 .proc_handler = addrconf_sysctl_mtu,
5836 },
5837 {
5838 .procname = "accept_ra",
5839 .data = &ipv6_devconf.accept_ra,
5840 .maxlen = sizeof(int),
5841 .mode = 0644,
5842 .proc_handler = proc_dointvec,
5843 },
5844 {
5845 .procname = "accept_redirects",
5846 .data = &ipv6_devconf.accept_redirects,
5847 .maxlen = sizeof(int),
5848 .mode = 0644,
5849 .proc_handler = proc_dointvec,
5850 },
5851 {
5852 .procname = "autoconf",
5853 .data = &ipv6_devconf.autoconf,
5854 .maxlen = sizeof(int),
5855 .mode = 0644,
5856 .proc_handler = proc_dointvec,
5857 },
5858 {
5859 .procname = "dad_transmits",
5860 .data = &ipv6_devconf.dad_transmits,
5861 .maxlen = sizeof(int),
5862 .mode = 0644,
5863 .proc_handler = proc_dointvec,
5864 },
5865 {
5866 .procname = "router_solicitations",
5867 .data = &ipv6_devconf.rtr_solicits,
5868 .maxlen = sizeof(int),
5869 .mode = 0644,
5870 .proc_handler = proc_dointvec_minmax,
5871 .extra1 = &minus_one,
5872 },
5873 {
5874 .procname = "router_solicitation_interval",
5875 .data = &ipv6_devconf.rtr_solicit_interval,
5876 .maxlen = sizeof(int),
5877 .mode = 0644,
5878 .proc_handler = proc_dointvec_jiffies,
5879 },
5880 {
5881 .procname = "router_solicitation_max_interval",
5882 .data = &ipv6_devconf.rtr_solicit_max_interval,
5883 .maxlen = sizeof(int),
5884 .mode = 0644,
5885 .proc_handler = proc_dointvec_jiffies,
5886 },
5887 {
5888 .procname = "router_solicitation_delay",
5889 .data = &ipv6_devconf.rtr_solicit_delay,
5890 .maxlen = sizeof(int),
5891 .mode = 0644,
5892 .proc_handler = proc_dointvec_jiffies,
5893 },
5894 {
5895 .procname = "force_mld_version",
5896 .data = &ipv6_devconf.force_mld_version,
5897 .maxlen = sizeof(int),
5898 .mode = 0644,
5899 .proc_handler = proc_dointvec,
5900 },
5901 {
5902 .procname = "mldv1_unsolicited_report_interval",
5903 .data =
5904 &ipv6_devconf.mldv1_unsolicited_report_interval,
5905 .maxlen = sizeof(int),
5906 .mode = 0644,
5907 .proc_handler = proc_dointvec_ms_jiffies,
5908 },
5909 {
5910 .procname = "mldv2_unsolicited_report_interval",
5911 .data =
5912 &ipv6_devconf.mldv2_unsolicited_report_interval,
5913 .maxlen = sizeof(int),
5914 .mode = 0644,
5915 .proc_handler = proc_dointvec_ms_jiffies,
5916 },
5917 {
5918 .procname = "use_tempaddr",
5919 .data = &ipv6_devconf.use_tempaddr,
5920 .maxlen = sizeof(int),
5921 .mode = 0644,
5922 .proc_handler = proc_dointvec,
5923 },
5924 {
5925 .procname = "temp_valid_lft",
5926 .data = &ipv6_devconf.temp_valid_lft,
5927 .maxlen = sizeof(int),
5928 .mode = 0644,
5929 .proc_handler = proc_dointvec,
5930 },
5931 {
5932 .procname = "temp_prefered_lft",
5933 .data = &ipv6_devconf.temp_prefered_lft,
5934 .maxlen = sizeof(int),
5935 .mode = 0644,
5936 .proc_handler = proc_dointvec,
5937 },
5938 {
5939 .procname = "regen_max_retry",
5940 .data = &ipv6_devconf.regen_max_retry,
5941 .maxlen = sizeof(int),
5942 .mode = 0644,
5943 .proc_handler = proc_dointvec,
5944 },
5945 {
5946 .procname = "max_desync_factor",
5947 .data = &ipv6_devconf.max_desync_factor,
5948 .maxlen = sizeof(int),
5949 .mode = 0644,
5950 .proc_handler = proc_dointvec,
5951 },
5952 {
5953 .procname = "max_addresses",
5954 .data = &ipv6_devconf.max_addresses,
5955 .maxlen = sizeof(int),
5956 .mode = 0644,
5957 .proc_handler = proc_dointvec,
5958 },
5959 {
5960 .procname = "accept_ra_defrtr",
5961 .data = &ipv6_devconf.accept_ra_defrtr,
5962 .maxlen = sizeof(int),
5963 .mode = 0644,
5964 .proc_handler = proc_dointvec,
5965 },
5966 {
5967 .procname = "accept_ra_min_hop_limit",
5968 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5969 .maxlen = sizeof(int),
5970 .mode = 0644,
5971 .proc_handler = proc_dointvec,
5972 },
5973 {
5974 .procname = "accept_ra_pinfo",
5975 .data = &ipv6_devconf.accept_ra_pinfo,
5976 .maxlen = sizeof(int),
5977 .mode = 0644,
5978 .proc_handler = proc_dointvec,
5979 },
5980 #ifdef CONFIG_IPV6_ROUTER_PREF
5981 {
5982 .procname = "accept_ra_rtr_pref",
5983 .data = &ipv6_devconf.accept_ra_rtr_pref,
5984 .maxlen = sizeof(int),
5985 .mode = 0644,
5986 .proc_handler = proc_dointvec,
5987 },
5988 {
5989 .procname = "router_probe_interval",
5990 .data = &ipv6_devconf.rtr_probe_interval,
5991 .maxlen = sizeof(int),
5992 .mode = 0644,
5993 .proc_handler = proc_dointvec_jiffies,
5994 },
5995 #ifdef CONFIG_IPV6_ROUTE_INFO
5996 {
5997 .procname = "accept_ra_rt_info_max_plen",
5998 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5999 .maxlen = sizeof(int),
6000 .mode = 0644,
6001 .proc_handler = proc_dointvec,
6002 },
6003 #endif
6004 #endif
6005 {
6006 .procname = "proxy_ndp",
6007 .data = &ipv6_devconf.proxy_ndp,
6008 .maxlen = sizeof(int),
6009 .mode = 0644,
6010 .proc_handler = addrconf_sysctl_proxy_ndp,
6011 },
6012 {
6013 .procname = "accept_source_route",
6014 .data = &ipv6_devconf.accept_source_route,
6015 .maxlen = sizeof(int),
6016 .mode = 0644,
6017 .proc_handler = proc_dointvec,
6018 },
6019 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6020 {
6021 .procname = "optimistic_dad",
6022 .data = &ipv6_devconf.optimistic_dad,
6023 .maxlen = sizeof(int),
6024 .mode = 0644,
6025 .proc_handler = proc_dointvec,
6026 },
6027 {
6028 .procname = "use_optimistic",
6029 .data = &ipv6_devconf.use_optimistic,
6030 .maxlen = sizeof(int),
6031 .mode = 0644,
6032 .proc_handler = proc_dointvec,
6033 },
6034 #endif
6035 #ifdef CONFIG_IPV6_MROUTE
6036 {
6037 .procname = "mc_forwarding",
6038 .data = &ipv6_devconf.mc_forwarding,
6039 .maxlen = sizeof(int),
6040 .mode = 0444,
6041 .proc_handler = proc_dointvec,
6042 },
6043 #endif
6044 {
6045 .procname = "disable_ipv6",
6046 .data = &ipv6_devconf.disable_ipv6,
6047 .maxlen = sizeof(int),
6048 .mode = 0644,
6049 .proc_handler = addrconf_sysctl_disable,
6050 },
6051 {
6052 .procname = "accept_dad",
6053 .data = &ipv6_devconf.accept_dad,
6054 .maxlen = sizeof(int),
6055 .mode = 0644,
6056 .proc_handler = proc_dointvec,
6057 },
6058 {
6059 .procname = "force_tllao",
6060 .data = &ipv6_devconf.force_tllao,
6061 .maxlen = sizeof(int),
6062 .mode = 0644,
6063 .proc_handler = proc_dointvec
6064 },
6065 {
6066 .procname = "ndisc_notify",
6067 .data = &ipv6_devconf.ndisc_notify,
6068 .maxlen = sizeof(int),
6069 .mode = 0644,
6070 .proc_handler = proc_dointvec
6071 },
6072 {
6073 .procname = "suppress_frag_ndisc",
6074 .data = &ipv6_devconf.suppress_frag_ndisc,
6075 .maxlen = sizeof(int),
6076 .mode = 0644,
6077 .proc_handler = proc_dointvec
6078 },
6079 {
6080 .procname = "accept_ra_from_local",
6081 .data = &ipv6_devconf.accept_ra_from_local,
6082 .maxlen = sizeof(int),
6083 .mode = 0644,
6084 .proc_handler = proc_dointvec,
6085 },
6086 {
6087 .procname = "accept_ra_mtu",
6088 .data = &ipv6_devconf.accept_ra_mtu,
6089 .maxlen = sizeof(int),
6090 .mode = 0644,
6091 .proc_handler = proc_dointvec,
6092 },
6093 {
6094 .procname = "stable_secret",
6095 .data = &ipv6_devconf.stable_secret,
6096 .maxlen = IPV6_MAX_STRLEN,
6097 .mode = 0600,
6098 .proc_handler = addrconf_sysctl_stable_secret,
6099 },
6100 {
6101 .procname = "use_oif_addrs_only",
6102 .data = &ipv6_devconf.use_oif_addrs_only,
6103 .maxlen = sizeof(int),
6104 .mode = 0644,
6105 .proc_handler = proc_dointvec,
6106 },
6107 {
6108 .procname = "ignore_routes_with_linkdown",
6109 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6110 .maxlen = sizeof(int),
6111 .mode = 0644,
6112 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6113 },
6114 {
6115 .procname = "drop_unicast_in_l2_multicast",
6116 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6117 .maxlen = sizeof(int),
6118 .mode = 0644,
6119 .proc_handler = proc_dointvec,
6120 },
6121 {
6122 .procname = "drop_unsolicited_na",
6123 .data = &ipv6_devconf.drop_unsolicited_na,
6124 .maxlen = sizeof(int),
6125 .mode = 0644,
6126 .proc_handler = proc_dointvec,
6127 },
6128 {
6129 .procname = "keep_addr_on_down",
6130 .data = &ipv6_devconf.keep_addr_on_down,
6131 .maxlen = sizeof(int),
6132 .mode = 0644,
6133 .proc_handler = proc_dointvec,
6134
6135 },
6136 {
6137 .procname = "seg6_enabled",
6138 .data = &ipv6_devconf.seg6_enabled,
6139 .maxlen = sizeof(int),
6140 .mode = 0644,
6141 .proc_handler = proc_dointvec,
6142 },
6143 #ifdef CONFIG_IPV6_SEG6_HMAC
6144 {
6145 .procname = "seg6_require_hmac",
6146 .data = &ipv6_devconf.seg6_require_hmac,
6147 .maxlen = sizeof(int),
6148 .mode = 0644,
6149 .proc_handler = proc_dointvec,
6150 },
6151 #endif
6152 {
6153 .procname = "enhanced_dad",
6154 .data = &ipv6_devconf.enhanced_dad,
6155 .maxlen = sizeof(int),
6156 .mode = 0644,
6157 .proc_handler = proc_dointvec,
6158 },
6159 {
6160 .procname = "addr_gen_mode",
6161 .data = &ipv6_devconf.addr_gen_mode,
6162 .maxlen = sizeof(int),
6163 .mode = 0644,
6164 .proc_handler = addrconf_sysctl_addr_gen_mode,
6165 },
6166 {
6167 /* sentinel */
6168 }
6169 };
6170
6171 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6172 struct inet6_dev *idev, struct ipv6_devconf *p)
6173 {
6174 int i, ifindex;
6175 struct ctl_table *table;
6176 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6177
6178 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6179 if (!table)
6180 goto out;
6181
6182 for (i = 0; table[i].data; i++) {
6183 table[i].data += (char *)p - (char *)&ipv6_devconf;
6184 /* If one of these is already set, then it is not safe to
6185 * overwrite either of them: this makes proc_dointvec_minmax
6186 * usable.
6187 */
6188 if (!table[i].extra1 && !table[i].extra2) {
6189 table[i].extra1 = idev; /* embedded; no ref */
6190 table[i].extra2 = net;
6191 }
6192 }
6193
6194 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6195
6196 p->sysctl_header = register_net_sysctl(net, path, table);
6197 if (!p->sysctl_header)
6198 goto free;
6199
6200 if (!strcmp(dev_name, "all"))
6201 ifindex = NETCONFA_IFINDEX_ALL;
6202 else if (!strcmp(dev_name, "default"))
6203 ifindex = NETCONFA_IFINDEX_DEFAULT;
6204 else
6205 ifindex = idev->dev->ifindex;
6206 inet6_netconf_notify_devconf(net, NETCONFA_ALL, ifindex, p);
6207 return 0;
6208
6209 free:
6210 kfree(table);
6211 out:
6212 return -ENOBUFS;
6213 }
6214
6215 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
6216 {
6217 struct ctl_table *table;
6218
6219 if (!p->sysctl_header)
6220 return;
6221
6222 table = p->sysctl_header->ctl_table_arg;
6223 unregister_net_sysctl_table(p->sysctl_header);
6224 p->sysctl_header = NULL;
6225 kfree(table);
6226 }
6227
6228 static int addrconf_sysctl_register(struct inet6_dev *idev)
6229 {
6230 int err;
6231
6232 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6233 return -EINVAL;
6234
6235 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6236 &ndisc_ifinfo_sysctl_change);
6237 if (err)
6238 return err;
6239 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6240 idev, &idev->cnf);
6241 if (err)
6242 neigh_sysctl_unregister(idev->nd_parms);
6243
6244 return err;
6245 }
6246
6247 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6248 {
6249 __addrconf_sysctl_unregister(&idev->cnf);
6250 neigh_sysctl_unregister(idev->nd_parms);
6251 }
6252
6253
6254 #endif
6255
6256 static int __net_init addrconf_init_net(struct net *net)
6257 {
6258 int err = -ENOMEM;
6259 struct ipv6_devconf *all, *dflt;
6260
6261 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6262 if (!all)
6263 goto err_alloc_all;
6264
6265 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6266 if (!dflt)
6267 goto err_alloc_dflt;
6268
6269 /* these will be inherited by all namespaces */
6270 dflt->autoconf = ipv6_defaults.autoconf;
6271 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6272
6273 dflt->stable_secret.initialized = false;
6274 all->stable_secret.initialized = false;
6275
6276 net->ipv6.devconf_all = all;
6277 net->ipv6.devconf_dflt = dflt;
6278
6279 #ifdef CONFIG_SYSCTL
6280 err = __addrconf_sysctl_register(net, "all", NULL, all);
6281 if (err < 0)
6282 goto err_reg_all;
6283
6284 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6285 if (err < 0)
6286 goto err_reg_dflt;
6287 #endif
6288 return 0;
6289
6290 #ifdef CONFIG_SYSCTL
6291 err_reg_dflt:
6292 __addrconf_sysctl_unregister(all);
6293 err_reg_all:
6294 kfree(dflt);
6295 #endif
6296 err_alloc_dflt:
6297 kfree(all);
6298 err_alloc_all:
6299 return err;
6300 }
6301
6302 static void __net_exit addrconf_exit_net(struct net *net)
6303 {
6304 #ifdef CONFIG_SYSCTL
6305 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
6306 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
6307 #endif
6308 kfree(net->ipv6.devconf_dflt);
6309 kfree(net->ipv6.devconf_all);
6310 }
6311
6312 static struct pernet_operations addrconf_ops = {
6313 .init = addrconf_init_net,
6314 .exit = addrconf_exit_net,
6315 };
6316
6317 static struct rtnl_af_ops inet6_ops __read_mostly = {
6318 .family = AF_INET6,
6319 .fill_link_af = inet6_fill_link_af,
6320 .get_link_af_size = inet6_get_link_af_size,
6321 .validate_link_af = inet6_validate_link_af,
6322 .set_link_af = inet6_set_link_af,
6323 };
6324
6325 /*
6326 * Init / cleanup code
6327 */
6328
6329 int __init addrconf_init(void)
6330 {
6331 struct inet6_dev *idev;
6332 int i, err;
6333
6334 err = ipv6_addr_label_init();
6335 if (err < 0) {
6336 pr_crit("%s: cannot initialize default policy table: %d\n",
6337 __func__, err);
6338 goto out;
6339 }
6340
6341 err = register_pernet_subsys(&addrconf_ops);
6342 if (err < 0)
6343 goto out_addrlabel;
6344
6345 addrconf_wq = create_workqueue("ipv6_addrconf");
6346 if (!addrconf_wq) {
6347 err = -ENOMEM;
6348 goto out_nowq;
6349 }
6350
6351 /* The addrconf netdev notifier requires that loopback_dev
6352 * has it's ipv6 private information allocated and setup
6353 * before it can bring up and give link-local addresses
6354 * to other devices which are up.
6355 *
6356 * Unfortunately, loopback_dev is not necessarily the first
6357 * entry in the global dev_base list of net devices. In fact,
6358 * it is likely to be the very last entry on that list.
6359 * So this causes the notifier registry below to try and
6360 * give link-local addresses to all devices besides loopback_dev
6361 * first, then loopback_dev, which cases all the non-loopback_dev
6362 * devices to fail to get a link-local address.
6363 *
6364 * So, as a temporary fix, allocate the ipv6 structure for
6365 * loopback_dev first by hand.
6366 * Longer term, all of the dependencies ipv6 has upon the loopback
6367 * device and it being up should be removed.
6368 */
6369 rtnl_lock();
6370 idev = ipv6_add_dev(init_net.loopback_dev);
6371 rtnl_unlock();
6372 if (IS_ERR(idev)) {
6373 err = PTR_ERR(idev);
6374 goto errlo;
6375 }
6376
6377 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6378 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
6379
6380 register_netdevice_notifier(&ipv6_dev_notf);
6381
6382 addrconf_verify();
6383
6384 rtnl_af_register(&inet6_ops);
6385
6386 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
6387 NULL);
6388 if (err < 0)
6389 goto errout;
6390
6391 /* Only the first call to __rtnl_register can fail */
6392 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
6393 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
6394 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
6395 inet6_dump_ifaddr, NULL);
6396 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
6397 inet6_dump_ifmcaddr, NULL);
6398 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
6399 inet6_dump_ifacaddr, NULL);
6400 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
6401 inet6_netconf_dump_devconf, NULL);
6402
6403 ipv6_addr_label_rtnl_register();
6404
6405 return 0;
6406 errout:
6407 rtnl_af_unregister(&inet6_ops);
6408 unregister_netdevice_notifier(&ipv6_dev_notf);
6409 errlo:
6410 destroy_workqueue(addrconf_wq);
6411 out_nowq:
6412 unregister_pernet_subsys(&addrconf_ops);
6413 out_addrlabel:
6414 ipv6_addr_label_cleanup();
6415 out:
6416 return err;
6417 }
6418
6419 void addrconf_cleanup(void)
6420 {
6421 struct net_device *dev;
6422 int i;
6423
6424 unregister_netdevice_notifier(&ipv6_dev_notf);
6425 unregister_pernet_subsys(&addrconf_ops);
6426 ipv6_addr_label_cleanup();
6427
6428 rtnl_lock();
6429
6430 __rtnl_af_unregister(&inet6_ops);
6431
6432 /* clean dev list */
6433 for_each_netdev(&init_net, dev) {
6434 if (__in6_dev_get(dev) == NULL)
6435 continue;
6436 addrconf_ifdown(dev, 1);
6437 }
6438 addrconf_ifdown(init_net.loopback_dev, 2);
6439
6440 /*
6441 * Check hash table.
6442 */
6443 spin_lock_bh(&addrconf_hash_lock);
6444 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6445 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6446 spin_unlock_bh(&addrconf_hash_lock);
6447 cancel_delayed_work(&addr_chk_work);
6448 rtnl_unlock();
6449
6450 destroy_workqueue(addrconf_wq);
6451 }
Ubuntu Artful kernel mirror