1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * IPv6 Address [auto]configuration
4 * Linux INET6 implementation
5 *
6 * Authors:
7 * Pedro Roque <roque@di.fc.ul.pt>
8 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 */
10
11 /*
12 * Changes:
13 *
14 * Janos Farkas : delete timer on ifdown
15 * <chexum@bankinf.banki.hu>
16 * Andi Kleen : kill double kfree on module
17 * unload.
18 * Maciej W. Rozycki : FDDI support
19 * sekiya@USAGI : Don't send too many RS
20 * packets.
21 * yoshfuji@USAGI : Fixed interval between DAD
22 * packets.
23 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
24 * address validation timer.
25 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
26 * support.
27 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
28 * address on a same interface.
29 * YOSHIFUJI Hideaki @USAGI : ARCnet support
30 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
31 * seq_file.
32 * YOSHIFUJI Hideaki @USAGI : improved source address
33 * selection; consider scope,
34 * status etc.
35 */
36
37 #define pr_fmt(fmt) "IPv6: " fmt
38
39 #include <linux/errno.h>
40 #include <linux/types.h>
41 #include <linux/kernel.h>
42 #include <linux/sched/signal.h>
43 #include <linux/socket.h>
44 #include <linux/sockios.h>
45 #include <linux/net.h>
46 #include <linux/inet.h>
47 #include <linux/in6.h>
48 #include <linux/netdevice.h>
49 #include <linux/if_addr.h>
50 #include <linux/if_arp.h>
51 #include <linux/if_arcnet.h>
52 #include <linux/if_infiniband.h>
53 #include <linux/route.h>
54 #include <linux/inetdevice.h>
55 #include <linux/init.h>
56 #include <linux/slab.h>
57 #ifdef CONFIG_SYSCTL
58 #include <linux/sysctl.h>
59 #endif
60 #include <linux/capability.h>
61 #include <linux/delay.h>
62 #include <linux/notifier.h>
63 #include <linux/string.h>
64 #include <linux/hash.h>
65
66 #include <net/net_namespace.h>
67 #include <net/sock.h>
68 #include <net/snmp.h>
69
70 #include <net/6lowpan.h>
71 #include <net/firewire.h>
72 #include <net/ipv6.h>
73 #include <net/protocol.h>
74 #include <net/ndisc.h>
75 #include <net/ip6_route.h>
76 #include <net/addrconf.h>
77 #include <net/tcp.h>
78 #include <net/ip.h>
79 #include <net/netlink.h>
80 #include <net/pkt_sched.h>
81 #include <net/l3mdev.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
85 #include <linux/random.h>
86 #include <linux/uaccess.h>
87 #include <asm/unaligned.h>
88
89 #include <linux/proc_fs.h>
90 #include <linux/seq_file.h>
91 #include <linux/export.h>
92
93 #define INFINITY_LIFE_TIME 0xFFFFFFFF
94
95 #define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
cstamp_delta(unsigned long cstamp)98 static inline u32 cstamp_delta(unsigned long cstamp)
99 {
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101 }
102
rfc3315_s14_backoff_init(s32 irt)103 static inline s32 rfc3315_s14_backoff_init(s32 irt)
104 {
105 /* multiply 'initial retransmission time' by 0.9 .. 1.1 */
106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109 }
110
rfc3315_s14_backoff_update(s32 rt,s32 mrt)111 static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112 {
113 /* multiply 'retransmission timeout' by 1.9 .. 2.1 */
114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117 /* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122 }
123
124 #ifdef CONFIG_SYSCTL
125 static int addrconf_sysctl_register(struct inet6_dev *idev);
126 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127 #else
addrconf_sysctl_register(struct inet6_dev * idev)128 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
129 {
130 return 0;
131 }
132
addrconf_sysctl_unregister(struct inet6_dev * idev)133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134 {
135 }
136 #endif
137
138 static void ipv6_regen_rndid(struct inet6_dev *idev);
139 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
140
141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
142 static int ipv6_count_addresses(const struct inet6_dev *idev);
143 static int ipv6_generate_stable_address(struct in6_addr *addr,
144 u8 dad_count,
145 const struct inet6_dev *idev);
146
147 #define IN6_ADDR_HSIZE_SHIFT 8
148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
149 /*
150 * Configured unicast address hash table
151 */
152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
153 static DEFINE_SPINLOCK(addrconf_hash_lock);
154
155 static void addrconf_verify(void);
156 static void addrconf_verify_rtnl(void);
157 static void addrconf_verify_work(struct work_struct *);
158
159 static struct workqueue_struct *addrconf_wq;
160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
161
162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
164
165 static void addrconf_type_change(struct net_device *dev,
166 unsigned long event);
167 static int addrconf_ifdown(struct net_device *dev, int how);
168
169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
170 int plen,
171 const struct net_device *dev,
172 u32 flags, u32 noflags,
173 bool no_gw);
174
175 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
176 static void addrconf_dad_work(struct work_struct *w);
177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
178 bool send_na);
179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
180 static void addrconf_rs_timer(struct timer_list *t);
181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
183
184 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
185 struct prefix_info *pinfo);
186
187 static struct ipv6_devconf ipv6_devconf __read_mostly = {
188 .forwarding = 0,
189 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
190 .mtu6 = IPV6_MIN_MTU,
191 .accept_ra = 1,
192 .accept_redirects = 1,
193 .autoconf = 1,
194 .force_mld_version = 0,
195 .mldv1_unsolicited_report_interval = 10 * HZ,
196 .mldv2_unsolicited_report_interval = HZ,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207 .max_addresses = IPV6_MAX_ADDRESSES,
208 .accept_ra_defrtr = 1,
209 .accept_ra_from_local = 0,
210 .accept_ra_min_hop_limit= 1,
211 .accept_ra_pinfo = 1,
212 #ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
214 .rtr_probe_interval = 60 * HZ,
215 #ifdef CONFIG_IPV6_ROUTE_INFO
216 .accept_ra_rt_info_min_plen = 0,
217 .accept_ra_rt_info_max_plen = 0,
218 #endif
219 #endif
220 .accept_ra_rt_table = 0,
221 .proxy_ndp = 0,
222 .accept_source_route = 0, /* we do not accept RH0 by default. */
223 .disable_ipv6 = 0,
224 .accept_dad = 0,
225 .suppress_frag_ndisc = 1,
226 .accept_ra_mtu = 1,
227 .stable_secret = {
228 .initialized = false,
229 },
230 .use_oif_addrs_only = 0,
231 .ignore_routes_with_linkdown = 0,
232 .keep_addr_on_down = 0,
233 .seg6_enabled = 0,
234 #ifdef CONFIG_IPV6_SEG6_HMAC
235 .seg6_require_hmac = 0,
236 #endif
237 .enhanced_dad = 1,
238 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
239 .disable_policy = 0,
240 };
241
242 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
243 .forwarding = 0,
244 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
245 .mtu6 = IPV6_MIN_MTU,
246 .accept_ra = 1,
247 .accept_redirects = 1,
248 .autoconf = 1,
249 .force_mld_version = 0,
250 .mldv1_unsolicited_report_interval = 10 * HZ,
251 .mldv2_unsolicited_report_interval = HZ,
252 .dad_transmits = 1,
253 .rtr_solicits = MAX_RTR_SOLICITATIONS,
254 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
255 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
256 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
257 .use_tempaddr = 0,
258 .temp_valid_lft = TEMP_VALID_LIFETIME,
259 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
260 .regen_max_retry = REGEN_MAX_RETRY,
261 .max_desync_factor = MAX_DESYNC_FACTOR,
262 .max_addresses = IPV6_MAX_ADDRESSES,
263 .accept_ra_defrtr = 1,
264 .accept_ra_from_local = 0,
265 .accept_ra_min_hop_limit= 1,
266 .accept_ra_pinfo = 1,
267 #ifdef CONFIG_IPV6_ROUTER_PREF
268 .accept_ra_rtr_pref = 1,
269 .rtr_probe_interval = 60 * HZ,
270 #ifdef CONFIG_IPV6_ROUTE_INFO
271 .accept_ra_rt_info_min_plen = 0,
272 .accept_ra_rt_info_max_plen = 0,
273 #endif
274 #endif
275 .accept_ra_rt_table = 0,
276 .proxy_ndp = 0,
277 .accept_source_route = 0, /* we do not accept RH0 by default. */
278 .disable_ipv6 = 0,
279 .accept_dad = 1,
280 .suppress_frag_ndisc = 1,
281 .accept_ra_mtu = 1,
282 .stable_secret = {
283 .initialized = false,
284 },
285 .use_oif_addrs_only = 0,
286 .ignore_routes_with_linkdown = 0,
287 .keep_addr_on_down = 0,
288 .seg6_enabled = 0,
289 #ifdef CONFIG_IPV6_SEG6_HMAC
290 .seg6_require_hmac = 0,
291 #endif
292 .enhanced_dad = 1,
293 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
294 .disable_policy = 0,
295 };
296
297 /* Check if link is ready: is it up and is a valid qdisc available */
addrconf_link_ready(const struct net_device * dev)298 static inline bool addrconf_link_ready(const struct net_device *dev)
299 {
300 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
301 }
302
addrconf_del_rs_timer(struct inet6_dev * idev)303 static void addrconf_del_rs_timer(struct inet6_dev *idev)
304 {
305 if (del_timer(&idev->rs_timer))
306 __in6_dev_put(idev);
307 }
308
addrconf_del_dad_work(struct inet6_ifaddr * ifp)309 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
310 {
311 if (cancel_delayed_work(&ifp->dad_work))
312 __in6_ifa_put(ifp);
313 }
314
addrconf_mod_rs_timer(struct inet6_dev * idev,unsigned long when)315 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
316 unsigned long when)
317 {
318 if (!mod_timer(&idev->rs_timer, jiffies + when))
319 in6_dev_hold(idev);
320 }
321
addrconf_mod_dad_work(struct inet6_ifaddr * ifp,unsigned long delay)322 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
323 unsigned long delay)
324 {
325 in6_ifa_hold(ifp);
326 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
327 in6_ifa_put(ifp);
328 }
329
snmp6_alloc_dev(struct inet6_dev * idev)330 static int snmp6_alloc_dev(struct inet6_dev *idev)
331 {
332 int i;
333
334 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
335 if (!idev->stats.ipv6)
336 goto err_ip;
337
338 for_each_possible_cpu(i) {
339 struct ipstats_mib *addrconf_stats;
340 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
341 u64_stats_init(&addrconf_stats->syncp);
342 }
343
344
345 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
346 GFP_KERNEL);
347 if (!idev->stats.icmpv6dev)
348 goto err_icmp;
349 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
350 GFP_KERNEL);
351 if (!idev->stats.icmpv6msgdev)
352 goto err_icmpmsg;
353
354 return 0;
355
356 err_icmpmsg:
357 kfree(idev->stats.icmpv6dev);
358 err_icmp:
359 free_percpu(idev->stats.ipv6);
360 err_ip:
361 return -ENOMEM;
362 }
363
ipv6_add_dev(struct net_device * dev)364 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
365 {
366 struct inet6_dev *ndev;
367 int err = -ENOMEM;
368
369 ASSERT_RTNL();
370
371 if (dev->mtu < IPV6_MIN_MTU)
372 return ERR_PTR(-EINVAL);
373
374 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
375 if (!ndev)
376 return ERR_PTR(err);
377
378 rwlock_init(&ndev->lock);
379 ndev->dev = dev;
380 INIT_LIST_HEAD(&ndev->addr_list);
381 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
382 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
383
384 if (ndev->cnf.stable_secret.initialized)
385 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
386
387 ndev->cnf.mtu6 = dev->mtu;
388 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
389 if (!ndev->nd_parms) {
390 kfree(ndev);
391 return ERR_PTR(err);
392 }
393 if (ndev->cnf.forwarding)
394 dev_disable_lro(dev);
395 /* We refer to the device */
396 dev_hold(dev);
397
398 if (snmp6_alloc_dev(ndev) < 0) {
399 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
400 __func__);
401 neigh_parms_release(&nd_tbl, ndev->nd_parms);
402 dev_put(dev);
403 kfree(ndev);
404 return ERR_PTR(err);
405 }
406
407 if (snmp6_register_dev(ndev) < 0) {
408 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
409 __func__, dev->name);
410 goto err_release;
411 }
412
413 /* One reference from device. */
414 refcount_set(&ndev->refcnt, 1);
415
416 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
417 ndev->cnf.accept_dad = -1;
418
419 #if IS_ENABLED(CONFIG_IPV6_SIT)
420 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
421 pr_info("%s: Disabled Multicast RS\n", dev->name);
422 ndev->cnf.rtr_solicits = 0;
423 }
424 #endif
425
426 INIT_LIST_HEAD(&ndev->tempaddr_list);
427 ndev->desync_factor = U32_MAX;
428 if ((dev->flags&IFF_LOOPBACK) ||
429 dev->type == ARPHRD_TUNNEL ||
430 dev->type == ARPHRD_TUNNEL6 ||
431 dev->type == ARPHRD_SIT ||
432 dev->type == ARPHRD_NONE) {
433 ndev->cnf.use_tempaddr = -1;
434 } else
435 ipv6_regen_rndid(ndev);
436
437 ndev->token = in6addr_any;
438
439 if (netif_running(dev) && addrconf_link_ready(dev))
440 ndev->if_flags |= IF_READY;
441
442 ipv6_mc_init_dev(ndev);
443 ndev->tstamp = jiffies;
444 err = addrconf_sysctl_register(ndev);
445 if (err) {
446 ipv6_mc_destroy_dev(ndev);
447 snmp6_unregister_dev(ndev);
448 goto err_release;
449 }
450 /* protected by rtnl_lock */
451 rcu_assign_pointer(dev->ip6_ptr, ndev);
452
453 /* Join interface-local all-node multicast group */
454 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
455
456 /* Join all-node multicast group */
457 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
458
459 /* Join all-router multicast group if forwarding is set */
460 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
461 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
462
463 return ndev;
464
465 err_release:
466 neigh_parms_release(&nd_tbl, ndev->nd_parms);
467 ndev->dead = 1;
468 in6_dev_finish_destroy(ndev);
469 return ERR_PTR(err);
470 }
471
ipv6_find_idev(struct net_device * dev)472 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
473 {
474 struct inet6_dev *idev;
475
476 ASSERT_RTNL();
477
478 idev = __in6_dev_get(dev);
479 if (!idev) {
480 idev = ipv6_add_dev(dev);
481 if (IS_ERR(idev))
482 return idev;
483 }
484
485 if (dev->flags&IFF_UP)
486 ipv6_mc_up(idev);
487 return idev;
488 }
489
inet6_netconf_msgsize_devconf(int type)490 static int inet6_netconf_msgsize_devconf(int type)
491 {
492 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
493 + nla_total_size(4); /* NETCONFA_IFINDEX */
494 bool all = false;
495
496 if (type == NETCONFA_ALL)
497 all = true;
498
499 if (all || type == NETCONFA_FORWARDING)
500 size += nla_total_size(4);
501 #ifdef CONFIG_IPV6_MROUTE
502 if (all || type == NETCONFA_MC_FORWARDING)
503 size += nla_total_size(4);
504 #endif
505 if (all || type == NETCONFA_PROXY_NEIGH)
506 size += nla_total_size(4);
507
508 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
509 size += nla_total_size(4);
510
511 return size;
512 }
513
inet6_netconf_fill_devconf(struct sk_buff * skb,int ifindex,struct ipv6_devconf * devconf,u32 portid,u32 seq,int event,unsigned int flags,int type)514 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
515 struct ipv6_devconf *devconf, u32 portid,
516 u32 seq, int event, unsigned int flags,
517 int type)
518 {
519 struct nlmsghdr *nlh;
520 struct netconfmsg *ncm;
521 bool all = false;
522
523 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
524 flags);
525 if (!nlh)
526 return -EMSGSIZE;
527
528 if (type == NETCONFA_ALL)
529 all = true;
530
531 ncm = nlmsg_data(nlh);
532 ncm->ncm_family = AF_INET6;
533
534 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
535 goto nla_put_failure;
536
537 if (!devconf)
538 goto out;
539
540 if ((all || type == NETCONFA_FORWARDING) &&
541 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
542 goto nla_put_failure;
543 #ifdef CONFIG_IPV6_MROUTE
544 if ((all || type == NETCONFA_MC_FORWARDING) &&
545 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
546 atomic_read(&devconf->mc_forwarding)) < 0)
547 goto nla_put_failure;
548 #endif
549 if ((all || type == NETCONFA_PROXY_NEIGH) &&
550 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
551 goto nla_put_failure;
552
553 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
554 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
555 devconf->ignore_routes_with_linkdown) < 0)
556 goto nla_put_failure;
557
558 out:
559 nlmsg_end(skb, nlh);
560 return 0;
561
562 nla_put_failure:
563 nlmsg_cancel(skb, nlh);
564 return -EMSGSIZE;
565 }
566
inet6_netconf_notify_devconf(struct net * net,int event,int type,int ifindex,struct ipv6_devconf * devconf)567 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
568 int ifindex, struct ipv6_devconf *devconf)
569 {
570 struct sk_buff *skb;
571 int err = -ENOBUFS;
572
573 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
574 if (!skb)
575 goto errout;
576
577 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
578 event, 0, type);
579 if (err < 0) {
580 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
581 WARN_ON(err == -EMSGSIZE);
582 kfree_skb(skb);
583 goto errout;
584 }
585 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
586 return;
587 errout:
588 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
589 }
590
591 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
592 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
593 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
594 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
595 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
596 };
597
inet6_netconf_valid_get_req(struct sk_buff * skb,const struct nlmsghdr * nlh,struct nlattr ** tb,struct netlink_ext_ack * extack)598 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
599 const struct nlmsghdr *nlh,
600 struct nlattr **tb,
601 struct netlink_ext_ack *extack)
602 {
603 int i, err;
604
605 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
606 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
607 return -EINVAL;
608 }
609
610 if (!netlink_strict_get_check(skb))
611 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
612 tb, NETCONFA_MAX,
613 devconf_ipv6_policy, extack);
614
615 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
616 tb, NETCONFA_MAX,
617 devconf_ipv6_policy, extack);
618 if (err)
619 return err;
620
621 for (i = 0; i <= NETCONFA_MAX; i++) {
622 if (!tb[i])
623 continue;
624
625 switch (i) {
626 case NETCONFA_IFINDEX:
627 break;
628 default:
629 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
630 return -EINVAL;
631 }
632 }
633
634 return 0;
635 }
636
inet6_netconf_get_devconf(struct sk_buff * in_skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)637 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
638 struct nlmsghdr *nlh,
639 struct netlink_ext_ack *extack)
640 {
641 struct net *net = sock_net(in_skb->sk);
642 struct nlattr *tb[NETCONFA_MAX+1];
643 struct inet6_dev *in6_dev = NULL;
644 struct net_device *dev = NULL;
645 struct sk_buff *skb;
646 struct ipv6_devconf *devconf;
647 int ifindex;
648 int err;
649
650 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
651 if (err < 0)
652 return err;
653
654 if (!tb[NETCONFA_IFINDEX])
655 return -EINVAL;
656
657 err = -EINVAL;
658 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
659 switch (ifindex) {
660 case NETCONFA_IFINDEX_ALL:
661 devconf = net->ipv6.devconf_all;
662 break;
663 case NETCONFA_IFINDEX_DEFAULT:
664 devconf = net->ipv6.devconf_dflt;
665 break;
666 default:
667 dev = dev_get_by_index(net, ifindex);
668 if (!dev)
669 return -EINVAL;
670 in6_dev = in6_dev_get(dev);
671 if (!in6_dev)
672 goto errout;
673 devconf = &in6_dev->cnf;
674 break;
675 }
676
677 err = -ENOBUFS;
678 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
679 if (!skb)
680 goto errout;
681
682 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
683 NETLINK_CB(in_skb).portid,
684 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
685 NETCONFA_ALL);
686 if (err < 0) {
687 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
688 WARN_ON(err == -EMSGSIZE);
689 kfree_skb(skb);
690 goto errout;
691 }
692 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
693 errout:
694 if (in6_dev)
695 in6_dev_put(in6_dev);
696 if (dev)
697 dev_put(dev);
698 return err;
699 }
700
701 /* Combine dev_addr_genid and dev_base_seq to detect changes.
702 */
inet6_base_seq(const struct net * net)703 static u32 inet6_base_seq(const struct net *net)
704 {
705 u32 res = atomic_read(&net->ipv6.dev_addr_genid) +
706 net->dev_base_seq;
707
708 /* Must not return 0 (see nl_dump_check_consistent()).
709 * Chose a value far away from 0.
710 */
711 if (!res)
712 res = 0x80000000;
713 return res;
714 }
715
716
inet6_netconf_dump_devconf(struct sk_buff * skb,struct netlink_callback * cb)717 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
718 struct netlink_callback *cb)
719 {
720 const struct nlmsghdr *nlh = cb->nlh;
721 struct net *net = sock_net(skb->sk);
722 int h, s_h;
723 int idx, s_idx;
724 struct net_device *dev;
725 struct inet6_dev *idev;
726 struct hlist_head *head;
727
728 if (cb->strict_check) {
729 struct netlink_ext_ack *extack = cb->extack;
730 struct netconfmsg *ncm;
731
732 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
733 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
734 return -EINVAL;
735 }
736
737 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
738 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
739 return -EINVAL;
740 }
741 }
742
743 s_h = cb->args[0];
744 s_idx = idx = cb->args[1];
745
746 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
747 idx = 0;
748 head = &net->dev_index_head[h];
749 rcu_read_lock();
750 cb->seq = inet6_base_seq(net);
751 hlist_for_each_entry_rcu(dev, head, index_hlist) {
752 if (idx < s_idx)
753 goto cont;
754 idev = __in6_dev_get(dev);
755 if (!idev)
756 goto cont;
757
758 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
759 &idev->cnf,
760 NETLINK_CB(cb->skb).portid,
761 nlh->nlmsg_seq,
762 RTM_NEWNETCONF,
763 NLM_F_MULTI,
764 NETCONFA_ALL) < 0) {
765 rcu_read_unlock();
766 goto done;
767 }
768 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
769 cont:
770 idx++;
771 }
772 rcu_read_unlock();
773 }
774 if (h == NETDEV_HASHENTRIES) {
775 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
776 net->ipv6.devconf_all,
777 NETLINK_CB(cb->skb).portid,
778 nlh->nlmsg_seq,
779 RTM_NEWNETCONF, NLM_F_MULTI,
780 NETCONFA_ALL) < 0)
781 goto done;
782 else
783 h++;
784 }
785 if (h == NETDEV_HASHENTRIES + 1) {
786 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
787 net->ipv6.devconf_dflt,
788 NETLINK_CB(cb->skb).portid,
789 nlh->nlmsg_seq,
790 RTM_NEWNETCONF, NLM_F_MULTI,
791 NETCONFA_ALL) < 0)
792 goto done;
793 else
794 h++;
795 }
796 done:
797 cb->args[0] = h;
798 cb->args[1] = idx;
799
800 return skb->len;
801 }
802
803 #ifdef CONFIG_SYSCTL
dev_forward_change(struct inet6_dev * idev)804 static void dev_forward_change(struct inet6_dev *idev)
805 {
806 struct net_device *dev;
807 struct inet6_ifaddr *ifa;
808 LIST_HEAD(tmp_addr_list);
809
810 if (!idev)
811 return;
812 dev = idev->dev;
813 if (idev->cnf.forwarding)
814 dev_disable_lro(dev);
815 if (dev->flags & IFF_MULTICAST) {
816 if (idev->cnf.forwarding) {
817 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
818 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
819 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
820 } else {
821 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
822 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
823 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
824 }
825 }
826
827 read_lock_bh(&idev->lock);
828 list_for_each_entry(ifa, &idev->addr_list, if_list) {
829 if (ifa->flags&IFA_F_TENTATIVE)
830 continue;
831 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
832 }
833 read_unlock_bh(&idev->lock);
834
835 while (!list_empty(&tmp_addr_list)) {
836 ifa = list_first_entry(&tmp_addr_list,
837 struct inet6_ifaddr, if_list_aux);
838 list_del(&ifa->if_list_aux);
839 if (idev->cnf.forwarding)
840 addrconf_join_anycast(ifa);
841 else
842 addrconf_leave_anycast(ifa);
843 }
844
845 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
846 NETCONFA_FORWARDING,
847 dev->ifindex, &idev->cnf);
848 }
849
850
addrconf_forward_change(struct net * net,__s32 newf)851 static void addrconf_forward_change(struct net *net, __s32 newf)
852 {
853 struct net_device *dev;
854 struct inet6_dev *idev;
855
856 for_each_netdev(net, dev) {
857 idev = __in6_dev_get(dev);
858 if (idev) {
859 int changed = (!idev->cnf.forwarding) ^ (!newf);
860 idev->cnf.forwarding = newf;
861 if (changed)
862 dev_forward_change(idev);
863 }
864 }
865 }
866
addrconf_fixup_forwarding(struct ctl_table * table,int * p,int newf)867 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
868 {
869 struct net *net;
870 int old;
871
872 if (!rtnl_trylock())
873 return restart_syscall();
874
875 net = (struct net *)table->extra2;
876 old = *p;
877 *p = newf;
878
879 if (p == &net->ipv6.devconf_dflt->forwarding) {
880 if ((!newf) ^ (!old))
881 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
882 NETCONFA_FORWARDING,
883 NETCONFA_IFINDEX_DEFAULT,
884 net->ipv6.devconf_dflt);
885 rtnl_unlock();
886 return 0;
887 }
888
889 if (p == &net->ipv6.devconf_all->forwarding) {
890 int old_dflt = net->ipv6.devconf_dflt->forwarding;
891
892 net->ipv6.devconf_dflt->forwarding = newf;
893 if ((!newf) ^ (!old_dflt))
894 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
895 NETCONFA_FORWARDING,
896 NETCONFA_IFINDEX_DEFAULT,
897 net->ipv6.devconf_dflt);
898
899 addrconf_forward_change(net, newf);
900 if ((!newf) ^ (!old))
901 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
902 NETCONFA_FORWARDING,
903 NETCONFA_IFINDEX_ALL,
904 net->ipv6.devconf_all);
905 } else if ((!newf) ^ (!old))
906 dev_forward_change((struct inet6_dev *)table->extra1);
907 rtnl_unlock();
908
909 if (newf)
910 rt6_purge_dflt_routers(net);
911 return 1;
912 }
913
addrconf_linkdown_change(struct net * net,__s32 newf)914 static void addrconf_linkdown_change(struct net *net, __s32 newf)
915 {
916 struct net_device *dev;
917 struct inet6_dev *idev;
918
919 for_each_netdev(net, dev) {
920 idev = __in6_dev_get(dev);
921 if (idev) {
922 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
923
924 idev->cnf.ignore_routes_with_linkdown = newf;
925 if (changed)
926 inet6_netconf_notify_devconf(dev_net(dev),
927 RTM_NEWNETCONF,
928 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
929 dev->ifindex,
930 &idev->cnf);
931 }
932 }
933 }
934
addrconf_fixup_linkdown(struct ctl_table * table,int * p,int newf)935 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
936 {
937 struct net *net;
938 int old;
939
940 if (!rtnl_trylock())
941 return restart_syscall();
942
943 net = (struct net *)table->extra2;
944 old = *p;
945 *p = newf;
946
947 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
948 if ((!newf) ^ (!old))
949 inet6_netconf_notify_devconf(net,
950 RTM_NEWNETCONF,
951 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
952 NETCONFA_IFINDEX_DEFAULT,
953 net->ipv6.devconf_dflt);
954 rtnl_unlock();
955 return 0;
956 }
957
958 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
959 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
960 addrconf_linkdown_change(net, newf);
961 if ((!newf) ^ (!old))
962 inet6_netconf_notify_devconf(net,
963 RTM_NEWNETCONF,
964 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
965 NETCONFA_IFINDEX_ALL,
966 net->ipv6.devconf_all);
967 }
968 rtnl_unlock();
969
970 return 1;
971 }
972
973 #endif
974
975 /* Nobody refers to this ifaddr, destroy it */
inet6_ifa_finish_destroy(struct inet6_ifaddr * ifp)976 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
977 {
978 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
979
980 #ifdef NET_REFCNT_DEBUG
981 pr_debug("%s\n", __func__);
982 #endif
983
984 in6_dev_put(ifp->idev);
985
986 if (cancel_delayed_work(&ifp->dad_work))
987 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
988 ifp);
989
990 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
991 pr_warn("Freeing alive inet6 address %p\n", ifp);
992 return;
993 }
994
995 kfree_rcu(ifp, rcu);
996 }
997
998 static void
ipv6_link_dev_addr(struct inet6_dev * idev,struct inet6_ifaddr * ifp)999 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
1000 {
1001 struct list_head *p;
1002 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
1003
1004 /*
1005 * Each device address list is sorted in order of scope -
1006 * global before linklocal.
1007 */
1008 list_for_each(p, &idev->addr_list) {
1009 struct inet6_ifaddr *ifa
1010 = list_entry(p, struct inet6_ifaddr, if_list);
1011 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
1012 break;
1013 }
1014
1015 list_add_tail_rcu(&ifp->if_list, p);
1016 }
1017
inet6_addr_hash(const struct net * net,const struct in6_addr * addr)1018 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1019 {
1020 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1021
1022 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1023 }
1024
ipv6_chk_same_addr(struct net * net,const struct in6_addr * addr,struct net_device * dev,unsigned int hash)1025 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1026 struct net_device *dev, unsigned int hash)
1027 {
1028 struct inet6_ifaddr *ifp;
1029
1030 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1031 if (!net_eq(dev_net(ifp->idev->dev), net))
1032 continue;
1033 if (ipv6_addr_equal(&ifp->addr, addr)) {
1034 if (!dev || ifp->idev->dev == dev)
1035 return true;
1036 }
1037 }
1038 return false;
1039 }
1040
ipv6_add_addr_hash(struct net_device * dev,struct inet6_ifaddr * ifa)1041 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1042 {
1043 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1044 int err = 0;
1045
1046 spin_lock(&addrconf_hash_lock);
1047
1048 /* Ignore adding duplicate addresses on an interface */
1049 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1050 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1051 err = -EEXIST;
1052 } else {
1053 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1054 }
1055
1056 spin_unlock(&addrconf_hash_lock);
1057
1058 return err;
1059 }
1060
1061 /* On success it returns ifp with increased reference count */
1062
1063 static struct inet6_ifaddr *
ipv6_add_addr(struct inet6_dev * idev,struct ifa6_config * cfg,bool can_block,struct netlink_ext_ack * extack)1064 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1065 bool can_block, struct netlink_ext_ack *extack)
1066 {
1067 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1068 int addr_type = ipv6_addr_type(cfg->pfx);
1069 struct net *net = dev_net(idev->dev);
1070 struct inet6_ifaddr *ifa = NULL;
1071 struct fib6_info *f6i = NULL;
1072 int err = 0;
1073
1074 if (addr_type == IPV6_ADDR_ANY ||
1075 (addr_type & IPV6_ADDR_MULTICAST &&
1076 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1077 (!(idev->dev->flags & IFF_LOOPBACK) &&
1078 !netif_is_l3_master(idev->dev) &&
1079 addr_type & IPV6_ADDR_LOOPBACK))
1080 return ERR_PTR(-EADDRNOTAVAIL);
1081
1082 if (idev->dead) {
1083 err = -ENODEV; /*XXX*/
1084 goto out;
1085 }
1086
1087 if (idev->cnf.disable_ipv6) {
1088 err = -EACCES;
1089 goto out;
1090 }
1091
1092 /* validator notifier needs to be blocking;
1093 * do not call in atomic context
1094 */
1095 if (can_block) {
1096 struct in6_validator_info i6vi = {
1097 .i6vi_addr = *cfg->pfx,
1098 .i6vi_dev = idev,
1099 .extack = extack,
1100 };
1101
1102 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1103 err = notifier_to_errno(err);
1104 if (err < 0)
1105 goto out;
1106 }
1107
1108 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1109 if (!ifa) {
1110 err = -ENOBUFS;
1111 goto out;
1112 }
1113
1114 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1115 if (IS_ERR(f6i)) {
1116 err = PTR_ERR(f6i);
1117 f6i = NULL;
1118 goto out;
1119 }
1120
1121 neigh_parms_data_state_setall(idev->nd_parms);
1122
1123 ifa->addr = *cfg->pfx;
1124 if (cfg->peer_pfx)
1125 ifa->peer_addr = *cfg->peer_pfx;
1126
1127 spin_lock_init(&ifa->lock);
1128 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1129 INIT_HLIST_NODE(&ifa->addr_lst);
1130 ifa->scope = cfg->scope;
1131 ifa->prefix_len = cfg->plen;
1132 ifa->rt_priority = cfg->rt_priority;
1133 ifa->flags = cfg->ifa_flags;
1134 /* No need to add the TENTATIVE flag for addresses with NODAD */
1135 if (!(cfg->ifa_flags & IFA_F_NODAD))
1136 ifa->flags |= IFA_F_TENTATIVE;
1137 ifa->valid_lft = cfg->valid_lft;
1138 ifa->prefered_lft = cfg->preferred_lft;
1139 ifa->cstamp = ifa->tstamp = jiffies;
1140 ifa->tokenized = false;
1141
1142 ifa->rt = f6i;
1143
1144 ifa->idev = idev;
1145 in6_dev_hold(idev);
1146
1147 /* For caller */
1148 refcount_set(&ifa->refcnt, 1);
1149
1150 rcu_read_lock_bh();
1151
1152 err = ipv6_add_addr_hash(idev->dev, ifa);
1153 if (err < 0) {
1154 rcu_read_unlock_bh();
1155 goto out;
1156 }
1157
1158 write_lock(&idev->lock);
1159
1160 /* Add to inet6_dev unicast addr list. */
1161 ipv6_link_dev_addr(idev, ifa);
1162
1163 if (ifa->flags&IFA_F_TEMPORARY) {
1164 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1165 in6_ifa_hold(ifa);
1166 }
1167
1168 in6_ifa_hold(ifa);
1169 write_unlock(&idev->lock);
1170
1171 rcu_read_unlock_bh();
1172
1173 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1174 out:
1175 if (unlikely(err < 0)) {
1176 fib6_info_release(f6i);
1177
1178 if (ifa) {
1179 if (ifa->idev)
1180 in6_dev_put(ifa->idev);
1181 kfree(ifa);
1182 }
1183 ifa = ERR_PTR(err);
1184 }
1185
1186 return ifa;
1187 }
1188
1189 enum cleanup_prefix_rt_t {
1190 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1191 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1192 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1193 };
1194
1195 /*
1196 * Check, whether the prefix for ifp would still need a prefix route
1197 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1198 * constants.
1199 *
1200 * 1) we don't purge prefix if address was not permanent.
1201 * prefix is managed by its own lifetime.
1202 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1203 * 3) if there are no addresses, delete prefix.
1204 * 4) if there are still other permanent address(es),
1205 * corresponding prefix is still permanent.
1206 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1207 * don't purge the prefix, assume user space is managing it.
1208 * 6) otherwise, update prefix lifetime to the
1209 * longest valid lifetime among the corresponding
1210 * addresses on the device.
1211 * Note: subsequent RA will update lifetime.
1212 **/
1213 static enum cleanup_prefix_rt_t
check_cleanup_prefix_route(struct inet6_ifaddr * ifp,unsigned long * expires)1214 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1215 {
1216 struct inet6_ifaddr *ifa;
1217 struct inet6_dev *idev = ifp->idev;
1218 unsigned long lifetime;
1219 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1220
1221 *expires = jiffies;
1222
1223 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1224 if (ifa == ifp)
1225 continue;
1226 if (ifa->prefix_len != ifp->prefix_len ||
1227 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1228 ifp->prefix_len))
1229 continue;
1230 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1231 return CLEANUP_PREFIX_RT_NOP;
1232
1233 action = CLEANUP_PREFIX_RT_EXPIRE;
1234
1235 spin_lock(&ifa->lock);
1236
1237 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1238 /*
1239 * Note: Because this address is
1240 * not permanent, lifetime <
1241 * LONG_MAX / HZ here.
1242 */
1243 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1244 *expires = ifa->tstamp + lifetime * HZ;
1245 spin_unlock(&ifa->lock);
1246 }
1247
1248 return action;
1249 }
1250
1251 static void
cleanup_prefix_route(struct inet6_ifaddr * ifp,unsigned long expires,bool del_rt,bool del_peer)1252 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1253 bool del_rt, bool del_peer)
1254 {
1255 struct fib6_info *f6i;
1256
1257 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1258 ifp->prefix_len,
1259 ifp->idev->dev, 0, RTF_DEFAULT, true);
1260 if (f6i) {
1261 if (del_rt)
1262 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
1263 else {
1264 if (!(f6i->fib6_flags & RTF_EXPIRES))
1265 fib6_set_expires(f6i, expires);
1266 fib6_info_release(f6i);
1267 }
1268 }
1269 }
1270
1271
1272 /* This function wants to get referenced ifp and releases it before return */
1273
ipv6_del_addr(struct inet6_ifaddr * ifp)1274 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1275 {
1276 int state;
1277 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1278 unsigned long expires;
1279
1280 ASSERT_RTNL();
1281
1282 spin_lock_bh(&ifp->lock);
1283 state = ifp->state;
1284 ifp->state = INET6_IFADDR_STATE_DEAD;
1285 spin_unlock_bh(&ifp->lock);
1286
1287 if (state == INET6_IFADDR_STATE_DEAD)
1288 goto out;
1289
1290 spin_lock_bh(&addrconf_hash_lock);
1291 hlist_del_init_rcu(&ifp->addr_lst);
1292 spin_unlock_bh(&addrconf_hash_lock);
1293
1294 write_lock_bh(&ifp->idev->lock);
1295
1296 if (ifp->flags&IFA_F_TEMPORARY) {
1297 list_del(&ifp->tmp_list);
1298 if (ifp->ifpub) {
1299 in6_ifa_put(ifp->ifpub);
1300 ifp->ifpub = NULL;
1301 }
1302 __in6_ifa_put(ifp);
1303 }
1304
1305 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1306 action = check_cleanup_prefix_route(ifp, &expires);
1307
1308 list_del_rcu(&ifp->if_list);
1309 __in6_ifa_put(ifp);
1310
1311 write_unlock_bh(&ifp->idev->lock);
1312
1313 addrconf_del_dad_work(ifp);
1314
1315 ipv6_ifa_notify(RTM_DELADDR, ifp);
1316
1317 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1318
1319 if (action != CLEANUP_PREFIX_RT_NOP) {
1320 cleanup_prefix_route(ifp, expires,
1321 action == CLEANUP_PREFIX_RT_DEL, false);
1322 }
1323
1324 /* clean up prefsrc entries */
1325 rt6_remove_prefsrc(ifp);
1326 out:
1327 in6_ifa_put(ifp);
1328 }
1329
ipv6_create_tempaddr(struct inet6_ifaddr * ifp,struct inet6_ifaddr * ift,bool block)1330 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1331 struct inet6_ifaddr *ift,
1332 bool block)
1333 {
1334 struct inet6_dev *idev = ifp->idev;
1335 struct in6_addr addr, *tmpaddr;
1336 unsigned long tmp_tstamp, age;
1337 unsigned long regen_advance;
1338 struct ifa6_config cfg;
1339 int ret = 0;
1340 unsigned long now = jiffies;
1341 long max_desync_factor;
1342 s32 cnf_temp_preferred_lft;
1343
1344 write_lock_bh(&idev->lock);
1345 if (ift) {
1346 spin_lock_bh(&ift->lock);
1347 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1348 spin_unlock_bh(&ift->lock);
1349 tmpaddr = &addr;
1350 } else {
1351 tmpaddr = NULL;
1352 }
1353 retry:
1354 in6_dev_hold(idev);
1355 if (idev->cnf.use_tempaddr <= 0) {
1356 write_unlock_bh(&idev->lock);
1357 pr_info("%s: use_tempaddr is disabled\n", __func__);
1358 in6_dev_put(idev);
1359 ret = -1;
1360 goto out;
1361 }
1362 spin_lock_bh(&ifp->lock);
1363 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1364 idev->cnf.use_tempaddr = -1; /*XXX*/
1365 spin_unlock_bh(&ifp->lock);
1366 write_unlock_bh(&idev->lock);
1367 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1368 __func__);
1369 in6_dev_put(idev);
1370 ret = -1;
1371 goto out;
1372 }
1373 in6_ifa_hold(ifp);
1374 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1375 ipv6_try_regen_rndid(idev, tmpaddr);
1376 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1377 age = (now - ifp->tstamp) / HZ;
1378
1379 regen_advance = idev->cnf.regen_max_retry *
1380 idev->cnf.dad_transmits *
1381 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1382
1383 /* recalculate max_desync_factor each time and update
1384 * idev->desync_factor if it's larger
1385 */
1386 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1387 max_desync_factor = min_t(long,
1388 idev->cnf.max_desync_factor,
1389 cnf_temp_preferred_lft - regen_advance);
1390
1391 if (unlikely(idev->desync_factor > max_desync_factor)) {
1392 if (max_desync_factor > 0) {
1393 get_random_bytes(&idev->desync_factor,
1394 sizeof(idev->desync_factor));
1395 idev->desync_factor %= max_desync_factor;
1396 } else {
1397 idev->desync_factor = 0;
1398 }
1399 }
1400
1401 memset(&cfg, 0, sizeof(cfg));
1402 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1403 idev->cnf.temp_valid_lft + age);
1404 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1405 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1406
1407 cfg.plen = ifp->prefix_len;
1408 tmp_tstamp = ifp->tstamp;
1409 spin_unlock_bh(&ifp->lock);
1410
1411 write_unlock_bh(&idev->lock);
1412
1413 /* A temporary address is created only if this calculated Preferred
1414 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1415 * an implementation must not create a temporary address with a zero
1416 * Preferred Lifetime.
1417 * Use age calculation as in addrconf_verify to avoid unnecessary
1418 * temporary addresses being generated.
1419 */
1420 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1421 if (cfg.preferred_lft <= regen_advance + age) {
1422 in6_ifa_put(ifp);
1423 in6_dev_put(idev);
1424 ret = -1;
1425 goto out;
1426 }
1427
1428 cfg.ifa_flags = IFA_F_TEMPORARY;
1429 /* set in addrconf_prefix_rcv() */
1430 if (ifp->flags & IFA_F_OPTIMISTIC)
1431 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1432
1433 cfg.pfx = &addr;
1434 cfg.scope = ipv6_addr_scope(cfg.pfx);
1435
1436 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1437 if (IS_ERR(ift)) {
1438 in6_ifa_put(ifp);
1439 in6_dev_put(idev);
1440 pr_info("%s: retry temporary address regeneration\n", __func__);
1441 tmpaddr = &addr;
1442 write_lock_bh(&idev->lock);
1443 goto retry;
1444 }
1445
1446 spin_lock_bh(&ift->lock);
1447 ift->ifpub = ifp;
1448 ift->cstamp = now;
1449 ift->tstamp = tmp_tstamp;
1450 spin_unlock_bh(&ift->lock);
1451
1452 addrconf_dad_start(ift);
1453 in6_ifa_put(ift);
1454 in6_dev_put(idev);
1455 out:
1456 return ret;
1457 }
1458
1459 /*
1460 * Choose an appropriate source address (RFC3484)
1461 */
1462 enum {
1463 IPV6_SADDR_RULE_INIT = 0,
1464 IPV6_SADDR_RULE_LOCAL,
1465 IPV6_SADDR_RULE_SCOPE,
1466 IPV6_SADDR_RULE_PREFERRED,
1467 #ifdef CONFIG_IPV6_MIP6
1468 IPV6_SADDR_RULE_HOA,
1469 #endif
1470 IPV6_SADDR_RULE_OIF,
1471 IPV6_SADDR_RULE_LABEL,
1472 IPV6_SADDR_RULE_PRIVACY,
1473 IPV6_SADDR_RULE_ORCHID,
1474 IPV6_SADDR_RULE_PREFIX,
1475 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1476 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1477 #endif
1478 IPV6_SADDR_RULE_MAX
1479 };
1480
1481 struct ipv6_saddr_score {
1482 int rule;
1483 int addr_type;
1484 struct inet6_ifaddr *ifa;
1485 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1486 int scopedist;
1487 int matchlen;
1488 };
1489
1490 struct ipv6_saddr_dst {
1491 const struct in6_addr *addr;
1492 int ifindex;
1493 int scope;
1494 int label;
1495 unsigned int prefs;
1496 };
1497
ipv6_saddr_preferred(int type)1498 static inline int ipv6_saddr_preferred(int type)
1499 {
1500 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1501 return 1;
1502 return 0;
1503 }
1504
ipv6_use_optimistic_addr(struct net * net,struct inet6_dev * idev)1505 static bool ipv6_use_optimistic_addr(struct net *net,
1506 struct inet6_dev *idev)
1507 {
1508 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1509 if (!idev)
1510 return false;
1511 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1512 return false;
1513 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1514 return false;
1515
1516 return true;
1517 #else
1518 return false;
1519 #endif
1520 }
1521
ipv6_allow_optimistic_dad(struct net * net,struct inet6_dev * idev)1522 static bool ipv6_allow_optimistic_dad(struct net *net,
1523 struct inet6_dev *idev)
1524 {
1525 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1526 if (!idev)
1527 return false;
1528 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1529 return false;
1530
1531 return true;
1532 #else
1533 return false;
1534 #endif
1535 }
1536
ipv6_get_saddr_eval(struct net * net,struct ipv6_saddr_score * score,struct ipv6_saddr_dst * dst,int i)1537 static int ipv6_get_saddr_eval(struct net *net,
1538 struct ipv6_saddr_score *score,
1539 struct ipv6_saddr_dst *dst,
1540 int i)
1541 {
1542 int ret;
1543
1544 if (i <= score->rule) {
1545 switch (i) {
1546 case IPV6_SADDR_RULE_SCOPE:
1547 ret = score->scopedist;
1548 break;
1549 case IPV6_SADDR_RULE_PREFIX:
1550 ret = score->matchlen;
1551 break;
1552 default:
1553 ret = !!test_bit(i, score->scorebits);
1554 }
1555 goto out;
1556 }
1557
1558 switch (i) {
1559 case IPV6_SADDR_RULE_INIT:
1560 /* Rule 0: remember if hiscore is not ready yet */
1561 ret = !!score->ifa;
1562 break;
1563 case IPV6_SADDR_RULE_LOCAL:
1564 /* Rule 1: Prefer same address */
1565 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1566 break;
1567 case IPV6_SADDR_RULE_SCOPE:
1568 /* Rule 2: Prefer appropriate scope
1569 *
1570 * ret
1571 * ^
1572 * -1 | d 15
1573 * ---+--+-+---> scope
1574 * |
1575 * | d is scope of the destination.
1576 * B-d | \
1577 * | \ <- smaller scope is better if
1578 * B-15 | \ if scope is enough for destination.
1579 * | ret = B - scope (-1 <= scope >= d <= 15).
1580 * d-C-1 | /
1581 * |/ <- greater is better
1582 * -C / if scope is not enough for destination.
1583 * /| ret = scope - C (-1 <= d < scope <= 15).
1584 *
1585 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1586 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1587 * Assume B = 0 and we get C > 29.
1588 */
1589 ret = __ipv6_addr_src_scope(score->addr_type);
1590 if (ret >= dst->scope)
1591 ret = -ret;
1592 else
1593 ret -= 128; /* 30 is enough */
1594 score->scopedist = ret;
1595 break;
1596 case IPV6_SADDR_RULE_PREFERRED:
1597 {
1598 /* Rule 3: Avoid deprecated and optimistic addresses */
1599 u8 avoid = IFA_F_DEPRECATED;
1600
1601 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1602 avoid |= IFA_F_OPTIMISTIC;
1603 ret = ipv6_saddr_preferred(score->addr_type) ||
1604 !(score->ifa->flags & avoid);
1605 break;
1606 }
1607 #ifdef CONFIG_IPV6_MIP6
1608 case IPV6_SADDR_RULE_HOA:
1609 {
1610 /* Rule 4: Prefer home address */
1611 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1612 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1613 break;
1614 }
1615 #endif
1616 case IPV6_SADDR_RULE_OIF:
1617 /* Rule 5: Prefer outgoing interface */
1618 ret = (!dst->ifindex ||
1619 dst->ifindex == score->ifa->idev->dev->ifindex);
1620 break;
1621 case IPV6_SADDR_RULE_LABEL:
1622 /* Rule 6: Prefer matching label */
1623 ret = ipv6_addr_label(net,
1624 &score->ifa->addr, score->addr_type,
1625 score->ifa->idev->dev->ifindex) == dst->label;
1626 break;
1627 case IPV6_SADDR_RULE_PRIVACY:
1628 {
1629 /* Rule 7: Prefer public address
1630 * Note: prefer temporary address if use_tempaddr >= 2
1631 */
1632 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1633 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1634 score->ifa->idev->cnf.use_tempaddr >= 2;
1635 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1636 break;
1637 }
1638 case IPV6_SADDR_RULE_ORCHID:
1639 /* Rule 8-: Prefer ORCHID vs ORCHID or
1640 * non-ORCHID vs non-ORCHID
1641 */
1642 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1643 ipv6_addr_orchid(dst->addr));
1644 break;
1645 case IPV6_SADDR_RULE_PREFIX:
1646 /* Rule 8: Use longest matching prefix */
1647 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1648 if (ret > score->ifa->prefix_len)
1649 ret = score->ifa->prefix_len;
1650 score->matchlen = ret;
1651 break;
1652 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1653 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1654 /* Optimistic addresses still have lower precedence than other
1655 * preferred addresses.
1656 */
1657 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1658 break;
1659 #endif
1660 default:
1661 ret = 0;
1662 }
1663
1664 if (ret)
1665 __set_bit(i, score->scorebits);
1666 score->rule = i;
1667 out:
1668 return ret;
1669 }
1670
__ipv6_dev_get_saddr(struct net * net,struct ipv6_saddr_dst * dst,struct inet6_dev * idev,struct ipv6_saddr_score * scores,int hiscore_idx)1671 static int __ipv6_dev_get_saddr(struct net *net,
1672 struct ipv6_saddr_dst *dst,
1673 struct inet6_dev *idev,
1674 struct ipv6_saddr_score *scores,
1675 int hiscore_idx)
1676 {
1677 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1678
1679 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1680 int i;
1681
1682 /*
1683 * - Tentative Address (RFC2462 section 5.4)
1684 * - A tentative address is not considered
1685 * "assigned to an interface" in the traditional
1686 * sense, unless it is also flagged as optimistic.
1687 * - Candidate Source Address (section 4)
1688 * - In any case, anycast addresses, multicast
1689 * addresses, and the unspecified address MUST
1690 * NOT be included in a candidate set.
1691 */
1692 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1693 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1694 continue;
1695
1696 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1697
1698 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1699 score->addr_type & IPV6_ADDR_MULTICAST)) {
1700 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1701 idev->dev->name);
1702 continue;
1703 }
1704
1705 score->rule = -1;
1706 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1707
1708 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1709 int minihiscore, miniscore;
1710
1711 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1712 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1713
1714 if (minihiscore > miniscore) {
1715 if (i == IPV6_SADDR_RULE_SCOPE &&
1716 score->scopedist > 0) {
1717 /*
1718 * special case:
1719 * each remaining entry
1720 * has too small (not enough)
1721 * scope, because ifa entries
1722 * are sorted by their scope
1723 * values.
1724 */
1725 goto out;
1726 }
1727 break;
1728 } else if (minihiscore < miniscore) {
1729 swap(hiscore, score);
1730 hiscore_idx = 1 - hiscore_idx;
1731
1732 /* restore our iterator */
1733 score->ifa = hiscore->ifa;
1734
1735 break;
1736 }
1737 }
1738 }
1739 out:
1740 return hiscore_idx;
1741 }
1742
ipv6_get_saddr_master(struct net * net,const struct net_device * dst_dev,const struct net_device * master,struct ipv6_saddr_dst * dst,struct ipv6_saddr_score * scores,int hiscore_idx)1743 static int ipv6_get_saddr_master(struct net *net,
1744 const struct net_device *dst_dev,
1745 const struct net_device *master,
1746 struct ipv6_saddr_dst *dst,
1747 struct ipv6_saddr_score *scores,
1748 int hiscore_idx)
1749 {
1750 struct inet6_dev *idev;
1751
1752 idev = __in6_dev_get(dst_dev);
1753 if (idev)
1754 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1755 scores, hiscore_idx);
1756
1757 idev = __in6_dev_get(master);
1758 if (idev)
1759 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1760 scores, hiscore_idx);
1761
1762 return hiscore_idx;
1763 }
1764
ipv6_dev_get_saddr(struct net * net,const struct net_device * dst_dev,const struct in6_addr * daddr,unsigned int prefs,struct in6_addr * saddr)1765 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1766 const struct in6_addr *daddr, unsigned int prefs,
1767 struct in6_addr *saddr)
1768 {
1769 struct ipv6_saddr_score scores[2], *hiscore;
1770 struct ipv6_saddr_dst dst;
1771 struct inet6_dev *idev;
1772 struct net_device *dev;
1773 int dst_type;
1774 bool use_oif_addr = false;
1775 int hiscore_idx = 0;
1776 int ret = 0;
1777
1778 dst_type = __ipv6_addr_type(daddr);
1779 dst.addr = daddr;
1780 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1781 dst.scope = __ipv6_addr_src_scope(dst_type);
1782 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1783 dst.prefs = prefs;
1784
1785 scores[hiscore_idx].rule = -1;
1786 scores[hiscore_idx].ifa = NULL;
1787
1788 rcu_read_lock();
1789
1790 /* Candidate Source Address (section 4)
1791 * - multicast and link-local destination address,
1792 * the set of candidate source address MUST only
1793 * include addresses assigned to interfaces
1794 * belonging to the same link as the outgoing
1795 * interface.
1796 * (- For site-local destination addresses, the
1797 * set of candidate source addresses MUST only
1798 * include addresses assigned to interfaces
1799 * belonging to the same site as the outgoing
1800 * interface.)
1801 * - "It is RECOMMENDED that the candidate source addresses
1802 * be the set of unicast addresses assigned to the
1803 * interface that will be used to send to the destination
1804 * (the 'outgoing' interface)." (RFC 6724)
1805 */
1806 if (dst_dev) {
1807 idev = __in6_dev_get(dst_dev);
1808 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1809 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1810 (idev && idev->cnf.use_oif_addrs_only)) {
1811 use_oif_addr = true;
1812 }
1813 }
1814
1815 if (use_oif_addr) {
1816 if (idev)
1817 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1818 } else {
1819 const struct net_device *master;
1820 int master_idx = 0;
1821
1822 /* if dst_dev exists and is enslaved to an L3 device, then
1823 * prefer addresses from dst_dev and then the master over
1824 * any other enslaved devices in the L3 domain.
1825 */
1826 master = l3mdev_master_dev_rcu(dst_dev);
1827 if (master) {
1828 master_idx = master->ifindex;
1829
1830 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1831 master, &dst,
1832 scores, hiscore_idx);
1833
1834 if (scores[hiscore_idx].ifa)
1835 goto out;
1836 }
1837
1838 for_each_netdev_rcu(net, dev) {
1839 /* only consider addresses on devices in the
1840 * same L3 domain
1841 */
1842 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1843 continue;
1844 idev = __in6_dev_get(dev);
1845 if (!idev)
1846 continue;
1847 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1848 }
1849 }
1850
1851 out:
1852 hiscore = &scores[hiscore_idx];
1853 if (!hiscore->ifa)
1854 ret = -EADDRNOTAVAIL;
1855 else
1856 *saddr = hiscore->ifa->addr;
1857
1858 rcu_read_unlock();
1859 return ret;
1860 }
1861 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1862
__ipv6_get_lladdr(struct inet6_dev * idev,struct in6_addr * addr,u32 banned_flags)1863 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1864 u32 banned_flags)
1865 {
1866 struct inet6_ifaddr *ifp;
1867 int err = -EADDRNOTAVAIL;
1868
1869 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1870 if (ifp->scope > IFA_LINK)
1871 break;
1872 if (ifp->scope == IFA_LINK &&
1873 !(ifp->flags & banned_flags)) {
1874 *addr = ifp->addr;
1875 err = 0;
1876 break;
1877 }
1878 }
1879 return err;
1880 }
1881
ipv6_get_lladdr(struct net_device * dev,struct in6_addr * addr,u32 banned_flags)1882 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1883 u32 banned_flags)
1884 {
1885 struct inet6_dev *idev;
1886 int err = -EADDRNOTAVAIL;
1887
1888 rcu_read_lock();
1889 idev = __in6_dev_get(dev);
1890 if (idev) {
1891 read_lock_bh(&idev->lock);
1892 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1893 read_unlock_bh(&idev->lock);
1894 }
1895 rcu_read_unlock();
1896 return err;
1897 }
1898
ipv6_count_addresses(const struct inet6_dev * idev)1899 static int ipv6_count_addresses(const struct inet6_dev *idev)
1900 {
1901 const struct inet6_ifaddr *ifp;
1902 int cnt = 0;
1903
1904 rcu_read_lock();
1905 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1906 cnt++;
1907 rcu_read_unlock();
1908 return cnt;
1909 }
1910
ipv6_chk_addr(struct net * net,const struct in6_addr * addr,const struct net_device * dev,int strict)1911 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1912 const struct net_device *dev, int strict)
1913 {
1914 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1915 strict, IFA_F_TENTATIVE);
1916 }
1917 EXPORT_SYMBOL(ipv6_chk_addr);
1918
1919 /* device argument is used to find the L3 domain of interest. If
1920 * skip_dev_check is set, then the ifp device is not checked against
1921 * the passed in dev argument. So the 2 cases for addresses checks are:
1922 * 1. does the address exist in the L3 domain that dev is part of
1923 * (skip_dev_check = true), or
1924 *
1925 * 2. does the address exist on the specific device
1926 * (skip_dev_check = false)
1927 */
ipv6_chk_addr_and_flags(struct net * net,const struct in6_addr * addr,const struct net_device * dev,bool skip_dev_check,int strict,u32 banned_flags)1928 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1929 const struct net_device *dev, bool skip_dev_check,
1930 int strict, u32 banned_flags)
1931 {
1932 unsigned int hash = inet6_addr_hash(net, addr);
1933 const struct net_device *l3mdev;
1934 struct inet6_ifaddr *ifp;
1935 u32 ifp_flags;
1936
1937 rcu_read_lock();
1938
1939 l3mdev = l3mdev_master_dev_rcu(dev);
1940 if (skip_dev_check)
1941 dev = NULL;
1942
1943 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1944 if (!net_eq(dev_net(ifp->idev->dev), net))
1945 continue;
1946
1947 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1948 continue;
1949
1950 /* Decouple optimistic from tentative for evaluation here.
1951 * Ban optimistic addresses explicitly, when required.
1952 */
1953 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1954 ? (ifp->flags&~IFA_F_TENTATIVE)
1955 : ifp->flags;
1956 if (ipv6_addr_equal(&ifp->addr, addr) &&
1957 !(ifp_flags&banned_flags) &&
1958 (!dev || ifp->idev->dev == dev ||
1959 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1960 rcu_read_unlock();
1961 return 1;
1962 }
1963 }
1964
1965 rcu_read_unlock();
1966 return 0;
1967 }
1968 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1969
1970
1971 /* Compares an address/prefix_len with addresses on device @dev.
1972 * If one is found it returns true.
1973 */
ipv6_chk_custom_prefix(const struct in6_addr * addr,const unsigned int prefix_len,struct net_device * dev)1974 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1975 const unsigned int prefix_len, struct net_device *dev)
1976 {
1977 const struct inet6_ifaddr *ifa;
1978 const struct inet6_dev *idev;
1979 bool ret = false;
1980
1981 rcu_read_lock();
1982 idev = __in6_dev_get(dev);
1983 if (idev) {
1984 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1985 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1986 if (ret)
1987 break;
1988 }
1989 }
1990 rcu_read_unlock();
1991
1992 return ret;
1993 }
1994 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1995
ipv6_chk_prefix(const struct in6_addr * addr,struct net_device * dev)1996 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1997 {
1998 const struct inet6_ifaddr *ifa;
1999 const struct inet6_dev *idev;
2000 int onlink;
2001
2002 onlink = 0;
2003 rcu_read_lock();
2004 idev = __in6_dev_get(dev);
2005 if (idev) {
2006 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
2007 onlink = ipv6_prefix_equal(addr, &ifa->addr,
2008 ifa->prefix_len);
2009 if (onlink)
2010 break;
2011 }
2012 }
2013 rcu_read_unlock();
2014 return onlink;
2015 }
2016 EXPORT_SYMBOL(ipv6_chk_prefix);
2017
ipv6_get_ifaddr(struct net * net,const struct in6_addr * addr,struct net_device * dev,int strict)2018 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2019 struct net_device *dev, int strict)
2020 {
2021 unsigned int hash = inet6_addr_hash(net, addr);
2022 struct inet6_ifaddr *ifp, *result = NULL;
2023
2024 rcu_read_lock();
2025 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2026 if (!net_eq(dev_net(ifp->idev->dev), net))
2027 continue;
2028 if (ipv6_addr_equal(&ifp->addr, addr)) {
2029 if (!dev || ifp->idev->dev == dev ||
2030 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2031 result = ifp;
2032 in6_ifa_hold(ifp);
2033 break;
2034 }
2035 }
2036 }
2037 rcu_read_unlock();
2038
2039 return result;
2040 }
2041
2042 /* Gets referenced address, destroys ifaddr */
2043
addrconf_dad_stop(struct inet6_ifaddr * ifp,int dad_failed)2044 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2045 {
2046 if (dad_failed)
2047 ifp->flags |= IFA_F_DADFAILED;
2048
2049 if (ifp->flags&IFA_F_TEMPORARY) {
2050 struct inet6_ifaddr *ifpub;
2051 spin_lock_bh(&ifp->lock);
2052 ifpub = ifp->ifpub;
2053 if (ifpub) {
2054 in6_ifa_hold(ifpub);
2055 spin_unlock_bh(&ifp->lock);
2056 ipv6_create_tempaddr(ifpub, ifp, true);
2057 in6_ifa_put(ifpub);
2058 } else {
2059 spin_unlock_bh(&ifp->lock);
2060 }
2061 ipv6_del_addr(ifp);
2062 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2063 spin_lock_bh(&ifp->lock);
2064 addrconf_del_dad_work(ifp);
2065 ifp->flags |= IFA_F_TENTATIVE;
2066 if (dad_failed)
2067 ifp->flags &= ~IFA_F_OPTIMISTIC;
2068 spin_unlock_bh(&ifp->lock);
2069 if (dad_failed)
2070 ipv6_ifa_notify(0, ifp);
2071 in6_ifa_put(ifp);
2072 } else {
2073 ipv6_del_addr(ifp);
2074 }
2075 }
2076
addrconf_dad_end(struct inet6_ifaddr * ifp)2077 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2078 {
2079 int err = -ENOENT;
2080
2081 spin_lock_bh(&ifp->lock);
2082 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2083 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2084 err = 0;
2085 }
2086 spin_unlock_bh(&ifp->lock);
2087
2088 return err;
2089 }
2090
addrconf_dad_failure(struct sk_buff * skb,struct inet6_ifaddr * ifp)2091 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2092 {
2093 struct inet6_dev *idev = ifp->idev;
2094 struct net *net = dev_net(ifp->idev->dev);
2095
2096 if (addrconf_dad_end(ifp)) {
2097 in6_ifa_put(ifp);
2098 return;
2099 }
2100
2101 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2102 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2103
2104 spin_lock_bh(&ifp->lock);
2105
2106 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2107 struct in6_addr new_addr;
2108 struct inet6_ifaddr *ifp2;
2109 int retries = ifp->stable_privacy_retry + 1;
2110 struct ifa6_config cfg = {
2111 .pfx = &new_addr,
2112 .plen = ifp->prefix_len,
2113 .ifa_flags = ifp->flags,
2114 .valid_lft = ifp->valid_lft,
2115 .preferred_lft = ifp->prefered_lft,
2116 .scope = ifp->scope,
2117 };
2118
2119 if (retries > net->ipv6.sysctl.idgen_retries) {
2120 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2121 ifp->idev->dev->name);
2122 goto errdad;
2123 }
2124
2125 new_addr = ifp->addr;
2126 if (ipv6_generate_stable_address(&new_addr, retries,
2127 idev))
2128 goto errdad;
2129
2130 spin_unlock_bh(&ifp->lock);
2131
2132 if (idev->cnf.max_addresses &&
2133 ipv6_count_addresses(idev) >=
2134 idev->cnf.max_addresses)
2135 goto lock_errdad;
2136
2137 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2138 ifp->idev->dev->name);
2139
2140 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2141 if (IS_ERR(ifp2))
2142 goto lock_errdad;
2143
2144 spin_lock_bh(&ifp2->lock);
2145 ifp2->stable_privacy_retry = retries;
2146 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2147 spin_unlock_bh(&ifp2->lock);
2148
2149 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2150 in6_ifa_put(ifp2);
2151 lock_errdad:
2152 spin_lock_bh(&ifp->lock);
2153 }
2154
2155 errdad:
2156 /* transition from _POSTDAD to _ERRDAD */
2157 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2158 spin_unlock_bh(&ifp->lock);
2159
2160 addrconf_mod_dad_work(ifp, 0);
2161 in6_ifa_put(ifp);
2162 }
2163
2164 /* Join to solicited addr multicast group.
2165 * caller must hold RTNL */
addrconf_join_solict(struct net_device * dev,const struct in6_addr * addr)2166 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2167 {
2168 struct in6_addr maddr;
2169
2170 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2171 return;
2172
2173 addrconf_addr_solict_mult(addr, &maddr);
2174 ipv6_dev_mc_inc(dev, &maddr);
2175 }
2176
2177 /* caller must hold RTNL */
addrconf_leave_solict(struct inet6_dev * idev,const struct in6_addr * addr)2178 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2179 {
2180 struct in6_addr maddr;
2181
2182 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2183 return;
2184
2185 addrconf_addr_solict_mult(addr, &maddr);
2186 __ipv6_dev_mc_dec(idev, &maddr);
2187 }
2188
2189 /* caller must hold RTNL */
addrconf_join_anycast(struct inet6_ifaddr * ifp)2190 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2191 {
2192 struct in6_addr addr;
2193
2194 if (ifp->prefix_len >= 127) /* RFC 6164 */
2195 return;
2196 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2197 if (ipv6_addr_any(&addr))
2198 return;
2199 __ipv6_dev_ac_inc(ifp->idev, &addr);
2200 }
2201
2202 /* caller must hold RTNL */
addrconf_leave_anycast(struct inet6_ifaddr * ifp)2203 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2204 {
2205 struct in6_addr addr;
2206
2207 if (ifp->prefix_len >= 127) /* RFC 6164 */
2208 return;
2209 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2210 if (ipv6_addr_any(&addr))
2211 return;
2212 __ipv6_dev_ac_dec(ifp->idev, &addr);
2213 }
2214
addrconf_ifid_6lowpan(u8 * eui,struct net_device * dev)2215 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2216 {
2217 switch (dev->addr_len) {
2218 case ETH_ALEN:
2219 memcpy(eui, dev->dev_addr, 3);
2220 eui[3] = 0xFF;
2221 eui[4] = 0xFE;
2222 memcpy(eui + 5, dev->dev_addr + 3, 3);
2223 break;
2224 case EUI64_ADDR_LEN:
2225 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2226 eui[0] ^= 2;
2227 break;
2228 default:
2229 return -1;
2230 }
2231
2232 return 0;
2233 }
2234
addrconf_ifid_ieee1394(u8 * eui,struct net_device * dev)2235 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2236 {
2237 union fwnet_hwaddr *ha;
2238
2239 if (dev->addr_len != FWNET_ALEN)
2240 return -1;
2241
2242 ha = (union fwnet_hwaddr *)dev->dev_addr;
2243
2244 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2245 eui[0] ^= 2;
2246 return 0;
2247 }
2248
addrconf_ifid_arcnet(u8 * eui,struct net_device * dev)2249 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2250 {
2251 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2252 if (dev->addr_len != ARCNET_ALEN)
2253 return -1;
2254 memset(eui, 0, 7);
2255 eui[7] = *(u8 *)dev->dev_addr;
2256 return 0;
2257 }
2258
addrconf_ifid_infiniband(u8 * eui,struct net_device * dev)2259 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2260 {
2261 if (dev->addr_len != INFINIBAND_ALEN)
2262 return -1;
2263 memcpy(eui, dev->dev_addr + 12, 8);
2264 eui[0] |= 2;
2265 return 0;
2266 }
2267
__ipv6_isatap_ifid(u8 * eui,__be32 addr)2268 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2269 {
2270 if (addr == 0)
2271 return -1;
2272 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2273 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2274 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2275 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2276 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2277 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2278 eui[1] = 0;
2279 eui[2] = 0x5E;
2280 eui[3] = 0xFE;
2281 memcpy(eui + 4, &addr, 4);
2282 return 0;
2283 }
2284
addrconf_ifid_sit(u8 * eui,struct net_device * dev)2285 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2286 {
2287 if (dev->priv_flags & IFF_ISATAP)
2288 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2289 return -1;
2290 }
2291
addrconf_ifid_gre(u8 * eui,struct net_device * dev)2292 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2293 {
2294 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2295 }
2296
addrconf_ifid_ip6tnl(u8 * eui,struct net_device * dev)2297 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2298 {
2299 memcpy(eui, dev->perm_addr, 3);
2300 memcpy(eui + 5, dev->perm_addr + 3, 3);
2301 eui[3] = 0xFF;
2302 eui[4] = 0xFE;
2303 eui[0] ^= 2;
2304 return 0;
2305 }
2306
ipv6_generate_eui64(u8 * eui,struct net_device * dev)2307 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2308 {
2309 switch (dev->type) {
2310 case ARPHRD_ETHER:
2311 case ARPHRD_FDDI:
2312 return addrconf_ifid_eui48(eui, dev);
2313 case ARPHRD_ARCNET:
2314 return addrconf_ifid_arcnet(eui, dev);
2315 case ARPHRD_INFINIBAND:
2316 return addrconf_ifid_infiniband(eui, dev);
2317 case ARPHRD_SIT:
2318 return addrconf_ifid_sit(eui, dev);
2319 case ARPHRD_IPGRE:
2320 case ARPHRD_TUNNEL:
2321 return addrconf_ifid_gre(eui, dev);
2322 case ARPHRD_6LOWPAN:
2323 return addrconf_ifid_6lowpan(eui, dev);
2324 case ARPHRD_IEEE1394:
2325 return addrconf_ifid_ieee1394(eui, dev);
2326 case ARPHRD_TUNNEL6:
2327 case ARPHRD_IP6GRE:
2328 case ARPHRD_RAWIP:
2329 return addrconf_ifid_ip6tnl(eui, dev);
2330 }
2331 return -1;
2332 }
2333
ipv6_inherit_eui64(u8 * eui,struct inet6_dev * idev)2334 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2335 {
2336 int err = -1;
2337 struct inet6_ifaddr *ifp;
2338
2339 read_lock_bh(&idev->lock);
2340 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2341 if (ifp->scope > IFA_LINK)
2342 break;
2343 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2344 memcpy(eui, ifp->addr.s6_addr+8, 8);
2345 err = 0;
2346 break;
2347 }
2348 }
2349 read_unlock_bh(&idev->lock);
2350 return err;
2351 }
2352
2353 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
ipv6_regen_rndid(struct inet6_dev * idev)2354 static void ipv6_regen_rndid(struct inet6_dev *idev)
2355 {
2356 regen:
2357 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2358 idev->rndid[0] &= ~0x02;
2359
2360 /*
2361 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2362 * check if generated address is not inappropriate
2363 *
2364 * - Reserved subnet anycast (RFC 2526)
2365 * 11111101 11....11 1xxxxxxx
2366 * - ISATAP (RFC4214) 6.1
2367 * 00-00-5E-FE-xx-xx-xx-xx
2368 * - value 0
2369 * - XXX: already assigned to an address on the device
2370 */
2371 if (idev->rndid[0] == 0xfd &&
2372 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2373 (idev->rndid[7]&0x80))
2374 goto regen;
2375 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2376 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2377 goto regen;
2378 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2379 goto regen;
2380 }
2381 }
2382
ipv6_try_regen_rndid(struct inet6_dev * idev,struct in6_addr * tmpaddr)2383 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2384 {
2385 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2386 ipv6_regen_rndid(idev);
2387 }
2388
addrconf_rt_table(const struct net_device * dev,u32 default_table)2389 u32 addrconf_rt_table(const struct net_device *dev, u32 default_table)
2390 {
2391 struct inet6_dev *idev = in6_dev_get(dev);
2392 int sysctl;
2393 u32 table;
2394
2395 if (!idev)
2396 return default_table;
2397 sysctl = idev->cnf.accept_ra_rt_table;
2398 if (sysctl == 0) {
2399 table = default_table;
2400 } else if (sysctl > 0) {
2401 table = (u32) sysctl;
2402 } else {
2403 table = (unsigned) dev->ifindex + (-sysctl);
2404 }
2405 in6_dev_put(idev);
2406 return table;
2407 }
2408
2409 /*
2410 * Add prefix route.
2411 */
2412
2413 static void
addrconf_prefix_route(struct in6_addr * pfx,int plen,u32 metric,struct net_device * dev,unsigned long expires,u32 flags,gfp_t gfp_flags)2414 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2415 struct net_device *dev, unsigned long expires,
2416 u32 flags, gfp_t gfp_flags)
2417 {
2418 struct fib6_config cfg = {
2419 .fc_table = l3mdev_fib_table(dev) ? : addrconf_rt_table(dev, RT6_TABLE_PREFIX),
2420 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2421 .fc_ifindex = dev->ifindex,
2422 .fc_expires = expires,
2423 .fc_dst_len = plen,
2424 .fc_flags = RTF_UP | flags,
2425 .fc_nlinfo.nl_net = dev_net(dev),
2426 .fc_protocol = RTPROT_KERNEL,
2427 .fc_type = RTN_UNICAST,
2428 };
2429
2430 cfg.fc_dst = *pfx;
2431
2432 /* Prevent useless cloning on PtP SIT.
2433 This thing is done here expecting that the whole
2434 class of non-broadcast devices need not cloning.
2435 */
2436 #if IS_ENABLED(CONFIG_IPV6_SIT)
2437 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2438 cfg.fc_flags |= RTF_NONEXTHOP;
2439 #endif
2440
2441 ip6_route_add(&cfg, gfp_flags, NULL);
2442 }
2443
2444
addrconf_get_prefix_route(const struct in6_addr * pfx,int plen,const struct net_device * dev,u32 flags,u32 noflags,bool no_gw)2445 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2446 int plen,
2447 const struct net_device *dev,
2448 u32 flags, u32 noflags,
2449 bool no_gw)
2450 {
2451 struct fib6_node *fn;
2452 struct fib6_info *rt = NULL;
2453 struct fib6_table *table;
2454 u32 tb_id = l3mdev_fib_table(dev) ? : addrconf_rt_table(dev, RT6_TABLE_PREFIX);
2455
2456 table = fib6_get_table(dev_net(dev), tb_id);
2457 if (!table)
2458 return NULL;
2459
2460 rcu_read_lock();
2461 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2462 if (!fn)
2463 goto out;
2464
2465 for_each_fib6_node_rt_rcu(fn) {
2466 /* prefix routes only use builtin fib6_nh */
2467 if (rt->nh)
2468 continue;
2469
2470 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2471 continue;
2472 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2473 continue;
2474 if ((rt->fib6_flags & flags) != flags)
2475 continue;
2476 if ((rt->fib6_flags & noflags) != 0)
2477 continue;
2478 if (!fib6_info_hold_safe(rt))
2479 continue;
2480 break;
2481 }
2482 out:
2483 rcu_read_unlock();
2484 return rt;
2485 }
2486
2487
2488 /* Create "default" multicast route to the interface */
2489
addrconf_add_mroute(struct net_device * dev)2490 static void addrconf_add_mroute(struct net_device *dev)
2491 {
2492 struct fib6_config cfg = {
2493 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2494 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2495 .fc_ifindex = dev->ifindex,
2496 .fc_dst_len = 8,
2497 .fc_flags = RTF_UP,
2498 .fc_type = RTN_MULTICAST,
2499 .fc_nlinfo.nl_net = dev_net(dev),
2500 .fc_protocol = RTPROT_KERNEL,
2501 };
2502
2503 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2504
2505 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2506 }
2507
addrconf_add_dev(struct net_device * dev)2508 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2509 {
2510 struct inet6_dev *idev;
2511
2512 ASSERT_RTNL();
2513
2514 idev = ipv6_find_idev(dev);
2515 if (IS_ERR(idev))
2516 return idev;
2517
2518 if (idev->cnf.disable_ipv6)
2519 return ERR_PTR(-EACCES);
2520
2521 /* Add default multicast route */
2522 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2523 addrconf_add_mroute(dev);
2524
2525 return idev;
2526 }
2527
manage_tempaddrs(struct inet6_dev * idev,struct inet6_ifaddr * ifp,__u32 valid_lft,__u32 prefered_lft,bool create,unsigned long now)2528 static void manage_tempaddrs(struct inet6_dev *idev,
2529 struct inet6_ifaddr *ifp,
2530 __u32 valid_lft, __u32 prefered_lft,
2531 bool create, unsigned long now)
2532 {
2533 u32 flags;
2534 struct inet6_ifaddr *ift;
2535
2536 read_lock_bh(&idev->lock);
2537 /* update all temporary addresses in the list */
2538 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2539 int age, max_valid, max_prefered;
2540
2541 if (ifp != ift->ifpub)
2542 continue;
2543
2544 /* RFC 4941 section 3.3:
2545 * If a received option will extend the lifetime of a public
2546 * address, the lifetimes of temporary addresses should
2547 * be extended, subject to the overall constraint that no
2548 * temporary addresses should ever remain "valid" or "preferred"
2549 * for a time longer than (TEMP_VALID_LIFETIME) or
2550 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2551 */
2552 age = (now - ift->cstamp) / HZ;
2553 max_valid = idev->cnf.temp_valid_lft - age;
2554 if (max_valid < 0)
2555 max_valid = 0;
2556
2557 max_prefered = idev->cnf.temp_prefered_lft -
2558 idev->desync_factor - age;
2559 if (max_prefered < 0)
2560 max_prefered = 0;
2561
2562 if (valid_lft > max_valid)
2563 valid_lft = max_valid;
2564
2565 if (prefered_lft > max_prefered)
2566 prefered_lft = max_prefered;
2567
2568 spin_lock(&ift->lock);
2569 flags = ift->flags;
2570 ift->valid_lft = valid_lft;
2571 ift->prefered_lft = prefered_lft;
2572 ift->tstamp = now;
2573 if (prefered_lft > 0)
2574 ift->flags &= ~IFA_F_DEPRECATED;
2575
2576 spin_unlock(&ift->lock);
2577 if (!(flags&IFA_F_TENTATIVE))
2578 ipv6_ifa_notify(0, ift);
2579 }
2580
2581 /* Also create a temporary address if it's enabled but no temporary
2582 * address currently exists.
2583 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2584 * as part of cleanup (ie. deleting the mngtmpaddr).
2585 * We don't want that to result in creating a new temporary ip address.
2586 */
2587 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2588 create = true;
2589
2590 if (create && idev->cnf.use_tempaddr > 0) {
2591 /* When a new public address is created as described
2592 * in [ADDRCONF], also create a new temporary address.
2593 */
2594 read_unlock_bh(&idev->lock);
2595 ipv6_create_tempaddr(ifp, NULL, false);
2596 } else {
2597 read_unlock_bh(&idev->lock);
2598 }
2599 }
2600
is_addr_mode_generate_stable(struct inet6_dev * idev)2601 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2602 {
2603 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2604 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2605 }
2606
addrconf_prefix_rcv_add_addr(struct net * net,struct net_device * dev,const struct prefix_info * pinfo,struct inet6_dev * in6_dev,const struct in6_addr * addr,int addr_type,u32 addr_flags,bool sllao,bool tokenized,__u32 valid_lft,u32 prefered_lft)2607 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2608 const struct prefix_info *pinfo,
2609 struct inet6_dev *in6_dev,
2610 const struct in6_addr *addr, int addr_type,
2611 u32 addr_flags, bool sllao, bool tokenized,
2612 __u32 valid_lft, u32 prefered_lft)
2613 {
2614 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2615 int create = 0, update_lft = 0;
2616
2617 if (!ifp && valid_lft) {
2618 int max_addresses = in6_dev->cnf.max_addresses;
2619 struct ifa6_config cfg = {
2620 .pfx = addr,
2621 .plen = pinfo->prefix_len,
2622 .ifa_flags = addr_flags,
2623 .valid_lft = valid_lft,
2624 .preferred_lft = prefered_lft,
2625 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2626 };
2627
2628 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2629 if ((net->ipv6.devconf_all->optimistic_dad ||
2630 in6_dev->cnf.optimistic_dad) &&
2631 !net->ipv6.devconf_all->forwarding && sllao)
2632 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2633 #endif
2634
2635 /* Do not allow to create too much of autoconfigured
2636 * addresses; this would be too easy way to crash kernel.
2637 */
2638 if (!max_addresses ||
2639 ipv6_count_addresses(in6_dev) < max_addresses)
2640 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2641
2642 if (IS_ERR_OR_NULL(ifp))
2643 return -1;
2644
2645 create = 1;
2646 spin_lock_bh(&ifp->lock);
2647 ifp->flags |= IFA_F_MANAGETEMPADDR;
2648 ifp->cstamp = jiffies;
2649 ifp->tokenized = tokenized;
2650 spin_unlock_bh(&ifp->lock);
2651 addrconf_dad_start(ifp);
2652 }
2653
2654 if (ifp) {
2655 u32 flags;
2656 unsigned long now;
2657 u32 stored_lft;
2658
2659 /* update lifetime (RFC2462 5.5.3 e) */
2660 spin_lock_bh(&ifp->lock);
2661 now = jiffies;
2662 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2663 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2664 else
2665 stored_lft = 0;
2666 if (!create && stored_lft) {
2667 const u32 minimum_lft = min_t(u32,
2668 stored_lft, MIN_VALID_LIFETIME);
2669 valid_lft = max(valid_lft, minimum_lft);
2670
2671 /* RFC4862 Section 5.5.3e:
2672 * "Note that the preferred lifetime of the
2673 * corresponding address is always reset to
2674 * the Preferred Lifetime in the received
2675 * Prefix Information option, regardless of
2676 * whether the valid lifetime is also reset or
2677 * ignored."
2678 *
2679 * So we should always update prefered_lft here.
2680 */
2681 update_lft = 1;
2682 }
2683
2684 if (update_lft) {
2685 ifp->valid_lft = valid_lft;
2686 ifp->prefered_lft = prefered_lft;
2687 ifp->tstamp = now;
2688 flags = ifp->flags;
2689 ifp->flags &= ~IFA_F_DEPRECATED;
2690 spin_unlock_bh(&ifp->lock);
2691
2692 if (!(flags&IFA_F_TENTATIVE))
2693 ipv6_ifa_notify(0, ifp);
2694 } else
2695 spin_unlock_bh(&ifp->lock);
2696
2697 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2698 create, now);
2699
2700 in6_ifa_put(ifp);
2701 addrconf_verify();
2702 }
2703
2704 return 0;
2705 }
2706 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2707
addrconf_prefix_rcv(struct net_device * dev,u8 * opt,int len,bool sllao)2708 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2709 {
2710 struct prefix_info *pinfo;
2711 __u32 valid_lft;
2712 __u32 prefered_lft;
2713 int addr_type, err;
2714 u32 addr_flags = 0;
2715 struct inet6_dev *in6_dev;
2716 struct net *net = dev_net(dev);
2717
2718 pinfo = (struct prefix_info *) opt;
2719
2720 if (len < sizeof(struct prefix_info)) {
2721 netdev_dbg(dev, "addrconf: prefix option too short\n");
2722 return;
2723 }
2724
2725 /*
2726 * Validation checks ([ADDRCONF], page 19)
2727 */
2728
2729 addr_type = ipv6_addr_type(&pinfo->prefix);
2730
2731 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2732 return;
2733
2734 valid_lft = ntohl(pinfo->valid);
2735 prefered_lft = ntohl(pinfo->prefered);
2736
2737 if (prefered_lft > valid_lft) {
2738 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2739 return;
2740 }
2741
2742 in6_dev = in6_dev_get(dev);
2743
2744 if (!in6_dev) {
2745 net_dbg_ratelimited("addrconf: device %s not configured\n",
2746 dev->name);
2747 return;
2748 }
2749
2750 /*
2751 * Two things going on here:
2752 * 1) Add routes for on-link prefixes
2753 * 2) Configure prefixes with the auto flag set
2754 */
2755
2756 if (pinfo->onlink) {
2757 struct fib6_info *rt;
2758 unsigned long rt_expires;
2759
2760 /* Avoid arithmetic overflow. Really, we could
2761 * save rt_expires in seconds, likely valid_lft,
2762 * but it would require division in fib gc, that it
2763 * not good.
2764 */
2765 if (HZ > USER_HZ)
2766 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2767 else
2768 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2769
2770 if (addrconf_finite_timeout(rt_expires))
2771 rt_expires *= HZ;
2772
2773 rt = addrconf_get_prefix_route(&pinfo->prefix,
2774 pinfo->prefix_len,
2775 dev,
2776 RTF_ADDRCONF | RTF_PREFIX_RT,
2777 RTF_DEFAULT, true);
2778
2779 if (rt) {
2780 /* Autoconf prefix route */
2781 if (valid_lft == 0) {
2782 ip6_del_rt(net, rt);
2783 rt = NULL;
2784 } else if (addrconf_finite_timeout(rt_expires)) {
2785 /* not infinity */
2786 fib6_set_expires(rt, jiffies + rt_expires);
2787 } else {
2788 fib6_clean_expires(rt);
2789 }
2790 } else if (valid_lft) {
2791 clock_t expires = 0;
2792 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2793 if (addrconf_finite_timeout(rt_expires)) {
2794 /* not infinity */
2795 flags |= RTF_EXPIRES;
2796 expires = jiffies_to_clock_t(rt_expires);
2797 }
2798 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2799 0, dev, expires, flags,
2800 GFP_ATOMIC);
2801 }
2802 fib6_info_release(rt);
2803 }
2804
2805 /* Try to figure out our local address for this prefix */
2806
2807 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2808 struct in6_addr addr;
2809 bool tokenized = false, dev_addr_generated = false;
2810
2811 if (pinfo->prefix_len == 64) {
2812 memcpy(&addr, &pinfo->prefix, 8);
2813
2814 if (!ipv6_addr_any(&in6_dev->token)) {
2815 read_lock_bh(&in6_dev->lock);
2816 memcpy(addr.s6_addr + 8,
2817 in6_dev->token.s6_addr + 8, 8);
2818 read_unlock_bh(&in6_dev->lock);
2819 tokenized = true;
2820 } else if (is_addr_mode_generate_stable(in6_dev) &&
2821 !ipv6_generate_stable_address(&addr, 0,
2822 in6_dev)) {
2823 addr_flags |= IFA_F_STABLE_PRIVACY;
2824 goto ok;
2825 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2826 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2827 goto put;
2828 } else {
2829 dev_addr_generated = true;
2830 }
2831 goto ok;
2832 }
2833 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2834 pinfo->prefix_len);
2835 goto put;
2836
2837 ok:
2838 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2839 &addr, addr_type,
2840 addr_flags, sllao,
2841 tokenized, valid_lft,
2842 prefered_lft);
2843 if (err)
2844 goto put;
2845
2846 /* Ignore error case here because previous prefix add addr was
2847 * successful which will be notified.
2848 */
2849 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2850 addr_type, addr_flags, sllao,
2851 tokenized, valid_lft,
2852 prefered_lft,
2853 dev_addr_generated);
2854 }
2855 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2856 put:
2857 in6_dev_put(in6_dev);
2858 }
2859
2860 /*
2861 * Set destination address.
2862 * Special case for SIT interfaces where we create a new "virtual"
2863 * device.
2864 */
addrconf_set_dstaddr(struct net * net,void __user * arg)2865 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2866 {
2867 struct in6_ifreq ireq;
2868 struct net_device *dev;
2869 int err = -EINVAL;
2870
2871 rtnl_lock();
2872
2873 err = -EFAULT;
2874 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2875 goto err_exit;
2876
2877 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2878
2879 err = -ENODEV;
2880 if (!dev)
2881 goto err_exit;
2882
2883 #if IS_ENABLED(CONFIG_IPV6_SIT)
2884 if (dev->type == ARPHRD_SIT) {
2885 const struct net_device_ops *ops = dev->netdev_ops;
2886 struct ifreq ifr;
2887 struct ip_tunnel_parm p;
2888
2889 err = -EADDRNOTAVAIL;
2890 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2891 goto err_exit;
2892
2893 memset(&p, 0, sizeof(p));
2894 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2895 p.iph.saddr = 0;
2896 p.iph.version = 4;
2897 p.iph.ihl = 5;
2898 p.iph.protocol = IPPROTO_IPV6;
2899 p.iph.ttl = 64;
2900 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2901
2902 if (ops->ndo_do_ioctl) {
2903 mm_segment_t oldfs = get_fs();
2904
2905 set_fs(KERNEL_DS);
2906 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2907 set_fs(oldfs);
2908 } else
2909 err = -EOPNOTSUPP;
2910
2911 if (err == 0) {
2912 err = -ENOBUFS;
2913 dev = __dev_get_by_name(net, p.name);
2914 if (!dev)
2915 goto err_exit;
2916 err = dev_open(dev, NULL);
2917 }
2918 }
2919 #endif
2920
2921 err_exit:
2922 rtnl_unlock();
2923 return err;
2924 }
2925
ipv6_mc_config(struct sock * sk,bool join,const struct in6_addr * addr,int ifindex)2926 static int ipv6_mc_config(struct sock *sk, bool join,
2927 const struct in6_addr *addr, int ifindex)
2928 {
2929 int ret;
2930
2931 ASSERT_RTNL();
2932
2933 lock_sock(sk);
2934 if (join)
2935 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2936 else
2937 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2938 release_sock(sk);
2939
2940 return ret;
2941 }
2942
2943 /*
2944 * Manual configuration of address on an interface
2945 */
inet6_addr_add(struct net * net,int ifindex,struct ifa6_config * cfg,struct netlink_ext_ack * extack)2946 static int inet6_addr_add(struct net *net, int ifindex,
2947 struct ifa6_config *cfg,
2948 struct netlink_ext_ack *extack)
2949 {
2950 struct inet6_ifaddr *ifp;
2951 struct inet6_dev *idev;
2952 struct net_device *dev;
2953 unsigned long timeout;
2954 clock_t expires;
2955 u32 flags;
2956
2957 ASSERT_RTNL();
2958
2959 if (cfg->plen > 128)
2960 return -EINVAL;
2961
2962 /* check the lifetime */
2963 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2964 return -EINVAL;
2965
2966 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2967 return -EINVAL;
2968
2969 dev = __dev_get_by_index(net, ifindex);
2970 if (!dev)
2971 return -ENODEV;
2972
2973 idev = addrconf_add_dev(dev);
2974 if (IS_ERR(idev))
2975 return PTR_ERR(idev);
2976
2977 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2978 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2979 true, cfg->pfx, ifindex);
2980
2981 if (ret < 0)
2982 return ret;
2983 }
2984
2985 cfg->scope = ipv6_addr_scope(cfg->pfx);
2986
2987 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2988 if (addrconf_finite_timeout(timeout)) {
2989 expires = jiffies_to_clock_t(timeout * HZ);
2990 cfg->valid_lft = timeout;
2991 flags = RTF_EXPIRES;
2992 } else {
2993 expires = 0;
2994 flags = 0;
2995 cfg->ifa_flags |= IFA_F_PERMANENT;
2996 }
2997
2998 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2999 if (addrconf_finite_timeout(timeout)) {
3000 if (timeout == 0)
3001 cfg->ifa_flags |= IFA_F_DEPRECATED;
3002 cfg->preferred_lft = timeout;
3003 }
3004
3005 ifp = ipv6_add_addr(idev, cfg, true, extack);
3006 if (!IS_ERR(ifp)) {
3007 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
3008 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3009 ifp->rt_priority, dev, expires,
3010 flags, GFP_KERNEL);
3011 }
3012
3013 /* Send a netlink notification if DAD is enabled and
3014 * optimistic flag is not set
3015 */
3016 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
3017 ipv6_ifa_notify(0, ifp);
3018 /*
3019 * Note that section 3.1 of RFC 4429 indicates
3020 * that the Optimistic flag should not be set for
3021 * manually configured addresses
3022 */
3023 addrconf_dad_start(ifp);
3024 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
3025 manage_tempaddrs(idev, ifp, cfg->valid_lft,
3026 cfg->preferred_lft, true, jiffies);
3027 in6_ifa_put(ifp);
3028 addrconf_verify_rtnl();
3029 return 0;
3030 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
3031 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
3032 cfg->pfx, ifindex);
3033 }
3034
3035 return PTR_ERR(ifp);
3036 }
3037
inet6_addr_del(struct net * net,int ifindex,u32 ifa_flags,const struct in6_addr * pfx,unsigned int plen)3038 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3039 const struct in6_addr *pfx, unsigned int plen)
3040 {
3041 struct inet6_ifaddr *ifp;
3042 struct inet6_dev *idev;
3043 struct net_device *dev;
3044
3045 if (plen > 128)
3046 return -EINVAL;
3047
3048 dev = __dev_get_by_index(net, ifindex);
3049 if (!dev)
3050 return -ENODEV;
3051
3052 idev = __in6_dev_get(dev);
3053 if (!idev)
3054 return -ENXIO;
3055
3056 read_lock_bh(&idev->lock);
3057 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3058 if (ifp->prefix_len == plen &&
3059 ipv6_addr_equal(pfx, &ifp->addr)) {
3060 in6_ifa_hold(ifp);
3061 read_unlock_bh(&idev->lock);
3062
3063 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3064 (ifa_flags & IFA_F_MANAGETEMPADDR))
3065 manage_tempaddrs(idev, ifp, 0, 0, false,
3066 jiffies);
3067 ipv6_del_addr(ifp);
3068 addrconf_verify_rtnl();
3069 if (ipv6_addr_is_multicast(pfx)) {
3070 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3071 false, pfx, dev->ifindex);
3072 }
3073 return 0;
3074 }
3075 }
3076 read_unlock_bh(&idev->lock);
3077 return -EADDRNOTAVAIL;
3078 }
3079
3080
addrconf_add_ifaddr(struct net * net,void __user * arg)3081 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3082 {
3083 struct ifa6_config cfg = {
3084 .ifa_flags = IFA_F_PERMANENT,
3085 .preferred_lft = INFINITY_LIFE_TIME,
3086 .valid_lft = INFINITY_LIFE_TIME,
3087 };
3088 struct in6_ifreq ireq;
3089 int err;
3090
3091 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3092 return -EPERM;
3093
3094 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3095 return -EFAULT;
3096
3097 cfg.pfx = &ireq.ifr6_addr;
3098 cfg.plen = ireq.ifr6_prefixlen;
3099
3100 rtnl_lock();
3101 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3102 rtnl_unlock();
3103 return err;
3104 }
3105
addrconf_del_ifaddr(struct net * net,void __user * arg)3106 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3107 {
3108 struct in6_ifreq ireq;
3109 int err;
3110
3111 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3112 return -EPERM;
3113
3114 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3115 return -EFAULT;
3116
3117 rtnl_lock();
3118 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3119 ireq.ifr6_prefixlen);
3120 rtnl_unlock();
3121 return err;
3122 }
3123
add_addr(struct inet6_dev * idev,const struct in6_addr * addr,int plen,int scope)3124 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3125 int plen, int scope)
3126 {
3127 struct inet6_ifaddr *ifp;
3128 struct ifa6_config cfg = {
3129 .pfx = addr,
3130 .plen = plen,
3131 .ifa_flags = IFA_F_PERMANENT,
3132 .valid_lft = INFINITY_LIFE_TIME,
3133 .preferred_lft = INFINITY_LIFE_TIME,
3134 .scope = scope
3135 };
3136
3137 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3138 if (!IS_ERR(ifp)) {
3139 spin_lock_bh(&ifp->lock);
3140 ifp->flags &= ~IFA_F_TENTATIVE;
3141 spin_unlock_bh(&ifp->lock);
3142 rt_genid_bump_ipv6(dev_net(idev->dev));
3143 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3144 in6_ifa_put(ifp);
3145 }
3146 }
3147
3148 #if IS_ENABLED(CONFIG_IPV6_SIT)
sit_add_v4_addrs(struct inet6_dev * idev)3149 static void sit_add_v4_addrs(struct inet6_dev *idev)
3150 {
3151 struct in6_addr addr;
3152 struct net_device *dev;
3153 struct net *net = dev_net(idev->dev);
3154 int scope, plen;
3155 u32 pflags = 0;
3156
3157 ASSERT_RTNL();
3158
3159 memset(&addr, 0, sizeof(struct in6_addr));
3160 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3161
3162 if (idev->dev->flags&IFF_POINTOPOINT) {
3163 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3164 return;
3165
3166 addr.s6_addr32[0] = htonl(0xfe800000);
3167 scope = IFA_LINK;
3168 plen = 64;
3169 } else {
3170 scope = IPV6_ADDR_COMPATv4;
3171 plen = 96;
3172 pflags |= RTF_NONEXTHOP;
3173 }
3174
3175 if (addr.s6_addr32[3]) {
3176 add_addr(idev, &addr, plen, scope);
3177 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3178 GFP_KERNEL);
3179 return;
3180 }
3181
3182 for_each_netdev(net, dev) {
3183 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3184 if (in_dev && (dev->flags & IFF_UP)) {
3185 struct in_ifaddr *ifa;
3186 int flag = scope;
3187
3188 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3189 addr.s6_addr32[3] = ifa->ifa_local;
3190
3191 if (ifa->ifa_scope == RT_SCOPE_LINK)
3192 continue;
3193 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3194 if (idev->dev->flags&IFF_POINTOPOINT)
3195 continue;
3196 flag |= IFA_HOST;
3197 }
3198
3199 add_addr(idev, &addr, plen, flag);
3200 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3201 0, pflags, GFP_KERNEL);
3202 }
3203 }
3204 }
3205 }
3206 #endif
3207
init_loopback(struct net_device * dev)3208 static void init_loopback(struct net_device *dev)
3209 {
3210 struct inet6_dev *idev;
3211
3212 /* ::1 */
3213
3214 ASSERT_RTNL();
3215
3216 idev = ipv6_find_idev(dev);
3217 if (IS_ERR(idev)) {
3218 pr_debug("%s: add_dev failed\n", __func__);
3219 return;
3220 }
3221
3222 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3223 }
3224
addrconf_add_linklocal(struct inet6_dev * idev,const struct in6_addr * addr,u32 flags)3225 void addrconf_add_linklocal(struct inet6_dev *idev,
3226 const struct in6_addr *addr, u32 flags)
3227 {
3228 struct ifa6_config cfg = {
3229 .pfx = addr,
3230 .plen = 64,
3231 .ifa_flags = flags | IFA_F_PERMANENT,
3232 .valid_lft = INFINITY_LIFE_TIME,
3233 .preferred_lft = INFINITY_LIFE_TIME,
3234 .scope = IFA_LINK
3235 };
3236 struct inet6_ifaddr *ifp;
3237
3238 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3239 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3240 idev->cnf.optimistic_dad) &&
3241 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3242 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3243 #endif
3244
3245 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3246 if (!IS_ERR(ifp)) {
3247 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3248 0, 0, GFP_ATOMIC);
3249 addrconf_dad_start(ifp);
3250 in6_ifa_put(ifp);
3251 }
3252 }
3253 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3254
ipv6_reserved_interfaceid(struct in6_addr address)3255 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3256 {
3257 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3258 return true;
3259
3260 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3261 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3262 return true;
3263
3264 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3265 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3266 return true;
3267
3268 return false;
3269 }
3270
ipv6_generate_stable_address(struct in6_addr * address,u8 dad_count,const struct inet6_dev * idev)3271 static int ipv6_generate_stable_address(struct in6_addr *address,
3272 u8 dad_count,
3273 const struct inet6_dev *idev)
3274 {
3275 static DEFINE_SPINLOCK(lock);
3276 static __u32 digest[SHA_DIGEST_WORDS];
3277 static __u32 workspace[SHA_WORKSPACE_WORDS];
3278
3279 static union {
3280 char __data[SHA_MESSAGE_BYTES];
3281 struct {
3282 struct in6_addr secret;
3283 __be32 prefix[2];
3284 unsigned char hwaddr[MAX_ADDR_LEN];
3285 u8 dad_count;
3286 } __packed;
3287 } data;
3288
3289 struct in6_addr secret;
3290 struct in6_addr temp;
3291 struct net *net = dev_net(idev->dev);
3292
3293 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3294
3295 if (idev->cnf.stable_secret.initialized)
3296 secret = idev->cnf.stable_secret.secret;
3297 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3298 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3299 else
3300 return -1;
3301
3302 retry:
3303 spin_lock_bh(&lock);
3304
3305 sha_init(digest);
3306 memset(&data, 0, sizeof(data));
3307 memset(workspace, 0, sizeof(workspace));
3308 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3309 data.prefix[0] = address->s6_addr32[0];
3310 data.prefix[1] = address->s6_addr32[1];
3311 data.secret = secret;
3312 data.dad_count = dad_count;
3313
3314 sha_transform(digest, data.__data, workspace);
3315
3316 temp = *address;
3317 temp.s6_addr32[2] = (__force __be32)digest[0];
3318 temp.s6_addr32[3] = (__force __be32)digest[1];
3319
3320 spin_unlock_bh(&lock);
3321
3322 if (ipv6_reserved_interfaceid(temp)) {
3323 dad_count++;
3324 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3325 return -1;
3326 goto retry;
3327 }
3328
3329 *address = temp;
3330 return 0;
3331 }
3332
ipv6_gen_mode_random_init(struct inet6_dev * idev)3333 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3334 {
3335 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3336
3337 if (s->initialized)
3338 return;
3339 s = &idev->cnf.stable_secret;
3340 get_random_bytes(&s->secret, sizeof(s->secret));
3341 s->initialized = true;
3342 }
3343
addrconf_addr_gen(struct inet6_dev * idev,bool prefix_route)3344 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3345 {
3346 struct in6_addr addr;
3347
3348 /* no link local addresses on L3 master devices */
3349 if (netif_is_l3_master(idev->dev))
3350 return;
3351
3352 /* no link local addresses on devices flagged as slaves */
3353 if (idev->dev->flags & IFF_SLAVE)
3354 return;
3355
3356 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3357
3358 switch (idev->cnf.addr_gen_mode) {
3359 case IN6_ADDR_GEN_MODE_RANDOM:
3360 ipv6_gen_mode_random_init(idev);
3361 /* fallthrough */
3362 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3363 if (!ipv6_generate_stable_address(&addr, 0, idev))
3364 addrconf_add_linklocal(idev, &addr,
3365 IFA_F_STABLE_PRIVACY);
3366 else if (prefix_route)
3367 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3368 0, 0, GFP_KERNEL);
3369 break;
3370 case IN6_ADDR_GEN_MODE_EUI64:
3371 /* addrconf_add_linklocal also adds a prefix_route and we
3372 * only need to care about prefix routes if ipv6_generate_eui64
3373 * couldn't generate one.
3374 */
3375 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3376 addrconf_add_linklocal(idev, &addr, 0);
3377 else if (prefix_route)
3378 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3379 0, 0, GFP_KERNEL);
3380 break;
3381 case IN6_ADDR_GEN_MODE_NONE:
3382 default:
3383 /* will not add any link local address */
3384 break;
3385 }
3386 }
3387
addrconf_dev_config(struct net_device * dev)3388 static void addrconf_dev_config(struct net_device *dev)
3389 {
3390 struct inet6_dev *idev;
3391
3392 ASSERT_RTNL();
3393
3394 if ((dev->type != ARPHRD_ETHER) &&
3395 (dev->type != ARPHRD_FDDI) &&
3396 (dev->type != ARPHRD_ARCNET) &&
3397 (dev->type != ARPHRD_INFINIBAND) &&
3398 (dev->type != ARPHRD_IEEE1394) &&
3399 (dev->type != ARPHRD_TUNNEL6) &&
3400 (dev->type != ARPHRD_6LOWPAN) &&
3401 (dev->type != ARPHRD_IP6GRE) &&
3402 (dev->type != ARPHRD_IPGRE) &&
3403 (dev->type != ARPHRD_TUNNEL) &&
3404 (dev->type != ARPHRD_NONE) &&
3405 (dev->type != ARPHRD_RAWIP)) {
3406 /* Alas, we support only Ethernet autoconfiguration. */
3407 idev = __in6_dev_get(dev);
3408 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3409 dev->flags & IFF_MULTICAST)
3410 ipv6_mc_up(idev);
3411 return;
3412 }
3413
3414 idev = addrconf_add_dev(dev);
3415 if (IS_ERR(idev))
3416 return;
3417
3418 /* this device type has no EUI support */
3419 if (dev->type == ARPHRD_NONE &&
3420 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3421 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3422
3423 addrconf_addr_gen(idev, false);
3424 }
3425
3426 #if IS_ENABLED(CONFIG_IPV6_SIT)
addrconf_sit_config(struct net_device * dev)3427 static void addrconf_sit_config(struct net_device *dev)
3428 {
3429 struct inet6_dev *idev;
3430
3431 ASSERT_RTNL();
3432
3433 /*
3434 * Configure the tunnel with one of our IPv4
3435 * addresses... we should configure all of
3436 * our v4 addrs in the tunnel
3437 */
3438
3439 idev = ipv6_find_idev(dev);
3440 if (IS_ERR(idev)) {
3441 pr_debug("%s: add_dev failed\n", __func__);
3442 return;
3443 }
3444
3445 if (dev->priv_flags & IFF_ISATAP) {
3446 addrconf_addr_gen(idev, false);
3447 return;
3448 }
3449
3450 sit_add_v4_addrs(idev);
3451
3452 if (dev->flags&IFF_POINTOPOINT)
3453 addrconf_add_mroute(dev);
3454 }
3455 #endif
3456
3457 #if IS_ENABLED(CONFIG_NET_IPGRE)
addrconf_gre_config(struct net_device * dev)3458 static void addrconf_gre_config(struct net_device *dev)
3459 {
3460 struct inet6_dev *idev;
3461
3462 ASSERT_RTNL();
3463
3464 idev = ipv6_find_idev(dev);
3465 if (IS_ERR(idev)) {
3466 pr_debug("%s: add_dev failed\n", __func__);
3467 return;
3468 }
3469
3470 addrconf_addr_gen(idev, true);
3471 if (dev->flags & IFF_POINTOPOINT)
3472 addrconf_add_mroute(dev);
3473 }
3474 #endif
3475
fixup_permanent_addr(struct net * net,struct inet6_dev * idev,struct inet6_ifaddr * ifp)3476 static int fixup_permanent_addr(struct net *net,
3477 struct inet6_dev *idev,
3478 struct inet6_ifaddr *ifp)
3479 {
3480 /* !fib6_node means the host route was removed from the
3481 * FIB, for example, if 'lo' device is taken down. In that
3482 * case regenerate the host route.
3483 */
3484 if (!ifp->rt || !ifp->rt->fib6_node) {
3485 struct fib6_info *f6i, *prev;
3486
3487 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3488 GFP_ATOMIC);
3489 if (IS_ERR(f6i))
3490 return PTR_ERR(f6i);
3491
3492 /* ifp->rt can be accessed outside of rtnl */
3493 spin_lock(&ifp->lock);
3494 prev = ifp->rt;
3495 ifp->rt = f6i;
3496 spin_unlock(&ifp->lock);
3497
3498 fib6_info_release(prev);
3499 }
3500
3501 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3502 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3503 ifp->rt_priority, idev->dev, 0, 0,
3504 GFP_ATOMIC);
3505 }
3506
3507 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3508 addrconf_dad_start(ifp);
3509
3510 return 0;
3511 }
3512
addrconf_permanent_addr(struct net * net,struct net_device * dev)3513 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3514 {
3515 struct inet6_ifaddr *ifp, *tmp;
3516 struct inet6_dev *idev;
3517
3518 idev = __in6_dev_get(dev);
3519 if (!idev)
3520 return;
3521
3522 write_lock_bh(&idev->lock);
3523
3524 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3525 if ((ifp->flags & IFA_F_PERMANENT) &&
3526 fixup_permanent_addr(net, idev, ifp) < 0) {
3527 write_unlock_bh(&idev->lock);
3528 in6_ifa_hold(ifp);
3529 ipv6_del_addr(ifp);
3530 write_lock_bh(&idev->lock);
3531
3532 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3533 idev->dev->name, &ifp->addr);
3534 }
3535 }
3536
3537 write_unlock_bh(&idev->lock);
3538 }
3539
addrconf_notify(struct notifier_block * this,unsigned long event,void * ptr)3540 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3541 void *ptr)
3542 {
3543 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3544 struct netdev_notifier_change_info *change_info;
3545 struct netdev_notifier_changeupper_info *info;
3546 struct inet6_dev *idev = __in6_dev_get(dev);
3547 struct net *net = dev_net(dev);
3548 int run_pending = 0;
3549 int err;
3550
3551 switch (event) {
3552 case NETDEV_REGISTER:
3553 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3554 idev = ipv6_add_dev(dev);
3555 if (IS_ERR(idev))
3556 return notifier_from_errno(PTR_ERR(idev));
3557 }
3558 break;
3559
3560 case NETDEV_CHANGEMTU:
3561 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3562 if (dev->mtu < IPV6_MIN_MTU) {
3563 addrconf_ifdown(dev, dev != net->loopback_dev);
3564 break;
3565 }
3566
3567 if (idev) {
3568 rt6_mtu_change(dev, dev->mtu);
3569 idev->cnf.mtu6 = dev->mtu;
3570 break;
3571 }
3572
3573 /* allocate new idev */
3574 idev = ipv6_add_dev(dev);
3575 if (IS_ERR(idev))
3576 break;
3577
3578 /* device is still not ready */
3579 if (!(idev->if_flags & IF_READY))
3580 break;
3581
3582 run_pending = 1;
3583
3584 /* fall through */
3585
3586 case NETDEV_UP:
3587 case NETDEV_CHANGE:
3588 if (dev->flags & IFF_SLAVE)
3589 break;
3590
3591 if (idev && idev->cnf.disable_ipv6)
3592 break;
3593
3594 if (event == NETDEV_UP) {
3595 /* restore routes for permanent addresses */
3596 addrconf_permanent_addr(net, dev);
3597
3598 if (!addrconf_link_ready(dev)) {
3599 /* device is not ready yet. */
3600 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3601 dev->name);
3602 break;
3603 }
3604
3605 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3606 idev = ipv6_add_dev(dev);
3607
3608 if (!IS_ERR_OR_NULL(idev)) {
3609 idev->if_flags |= IF_READY;
3610 run_pending = 1;
3611 }
3612 } else if (event == NETDEV_CHANGE) {
3613 if (!addrconf_link_ready(dev)) {
3614 /* device is still not ready. */
3615 rt6_sync_down_dev(dev, event);
3616 break;
3617 }
3618
3619 if (!IS_ERR_OR_NULL(idev)) {
3620 if (idev->if_flags & IF_READY) {
3621 /* device is already configured -
3622 * but resend MLD reports, we might
3623 * have roamed and need to update
3624 * multicast snooping switches
3625 */
3626 ipv6_mc_up(idev);
3627 change_info = ptr;
3628 if (change_info->flags_changed & IFF_NOARP)
3629 addrconf_dad_run(idev, true);
3630 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3631 break;
3632 }
3633 idev->if_flags |= IF_READY;
3634 }
3635
3636 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3637 dev->name);
3638
3639 run_pending = 1;
3640 }
3641
3642 switch (dev->type) {
3643 #if IS_ENABLED(CONFIG_IPV6_SIT)
3644 case ARPHRD_SIT:
3645 addrconf_sit_config(dev);
3646 break;
3647 #endif
3648 #if IS_ENABLED(CONFIG_NET_IPGRE)
3649 case ARPHRD_IPGRE:
3650 addrconf_gre_config(dev);
3651 break;
3652 #endif
3653 case ARPHRD_LOOPBACK:
3654 init_loopback(dev);
3655 break;
3656
3657 default:
3658 addrconf_dev_config(dev);
3659 break;
3660 }
3661
3662 if (!IS_ERR_OR_NULL(idev)) {
3663 if (run_pending)
3664 addrconf_dad_run(idev, false);
3665
3666 /* Device has an address by now */
3667 rt6_sync_up(dev, RTNH_F_DEAD);
3668
3669 /*
3670 * If the MTU changed during the interface down,
3671 * when the interface up, the changed MTU must be
3672 * reflected in the idev as well as routers.
3673 */
3674 if (idev->cnf.mtu6 != dev->mtu &&
3675 dev->mtu >= IPV6_MIN_MTU) {
3676 rt6_mtu_change(dev, dev->mtu);
3677 idev->cnf.mtu6 = dev->mtu;
3678 }
3679 idev->tstamp = jiffies;
3680 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3681
3682 /*
3683 * If the changed mtu during down is lower than
3684 * IPV6_MIN_MTU stop IPv6 on this interface.
3685 */
3686 if (dev->mtu < IPV6_MIN_MTU)
3687 addrconf_ifdown(dev, dev != net->loopback_dev);
3688 }
3689 break;
3690
3691 case NETDEV_DOWN:
3692 case NETDEV_UNREGISTER:
3693 /*
3694 * Remove all addresses from this interface.
3695 */
3696 addrconf_ifdown(dev, event != NETDEV_DOWN);
3697 break;
3698
3699 case NETDEV_CHANGENAME:
3700 if (idev) {
3701 snmp6_unregister_dev(idev);
3702 addrconf_sysctl_unregister(idev);
3703 err = addrconf_sysctl_register(idev);
3704 if (err)
3705 return notifier_from_errno(err);
3706 err = snmp6_register_dev(idev);
3707 if (err) {
3708 addrconf_sysctl_unregister(idev);
3709 return notifier_from_errno(err);
3710 }
3711 }
3712 break;
3713
3714 case NETDEV_PRE_TYPE_CHANGE:
3715 case NETDEV_POST_TYPE_CHANGE:
3716 if (idev)
3717 addrconf_type_change(dev, event);
3718 break;
3719
3720 case NETDEV_CHANGEUPPER:
3721 info = ptr;
3722
3723 /* flush all routes if dev is linked to or unlinked from
3724 * an L3 master device (e.g., VRF)
3725 */
3726 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3727 addrconf_ifdown(dev, 0);
3728 }
3729
3730 return NOTIFY_OK;
3731 }
3732
3733 /*
3734 * addrconf module should be notified of a device going up
3735 */
3736 static struct notifier_block ipv6_dev_notf = {
3737 .notifier_call = addrconf_notify,
3738 .priority = ADDRCONF_NOTIFY_PRIORITY,
3739 };
3740
addrconf_type_change(struct net_device * dev,unsigned long event)3741 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3742 {
3743 struct inet6_dev *idev;
3744 ASSERT_RTNL();
3745
3746 idev = __in6_dev_get(dev);
3747
3748 if (event == NETDEV_POST_TYPE_CHANGE)
3749 ipv6_mc_remap(idev);
3750 else if (event == NETDEV_PRE_TYPE_CHANGE)
3751 ipv6_mc_unmap(idev);
3752 }
3753
addr_is_local(const struct in6_addr * addr)3754 static bool addr_is_local(const struct in6_addr *addr)
3755 {
3756 return ipv6_addr_type(addr) &
3757 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3758 }
3759
addrconf_ifdown(struct net_device * dev,int how)3760 static int addrconf_ifdown(struct net_device *dev, int how)
3761 {
3762 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3763 struct net *net = dev_net(dev);
3764 struct inet6_dev *idev;
3765 struct inet6_ifaddr *ifa;
3766 LIST_HEAD(tmp_addr_list);
3767 bool keep_addr = false;
3768 bool was_ready;
3769 int state, i;
3770
3771 ASSERT_RTNL();
3772
3773 rt6_disable_ip(dev, event);
3774
3775 idev = __in6_dev_get(dev);
3776 if (!idev)
3777 return -ENODEV;
3778
3779 /*
3780 * Step 1: remove reference to ipv6 device from parent device.
3781 * Do not dev_put!
3782 */
3783 if (how) {
3784 idev->dead = 1;
3785
3786 /* protected by rtnl_lock */
3787 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3788
3789 /* Step 1.5: remove snmp6 entry */
3790 snmp6_unregister_dev(idev);
3791
3792 }
3793
3794 /* combine the user config with event to determine if permanent
3795 * addresses are to be removed from address hash table
3796 */
3797 if (!how && !idev->cnf.disable_ipv6) {
3798 /* aggregate the system setting and interface setting */
3799 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3800
3801 if (!_keep_addr)
3802 _keep_addr = idev->cnf.keep_addr_on_down;
3803
3804 keep_addr = (_keep_addr > 0);
3805 }
3806
3807 /* Step 2: clear hash table */
3808 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3809 struct hlist_head *h = &inet6_addr_lst[i];
3810
3811 spin_lock_bh(&addrconf_hash_lock);
3812 restart:
3813 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3814 if (ifa->idev == idev) {
3815 addrconf_del_dad_work(ifa);
3816 /* combined flag + permanent flag decide if
3817 * address is retained on a down event
3818 */
3819 if (!keep_addr ||
3820 !(ifa->flags & IFA_F_PERMANENT) ||
3821 addr_is_local(&ifa->addr)) {
3822 hlist_del_init_rcu(&ifa->addr_lst);
3823 goto restart;
3824 }
3825 }
3826 }
3827 spin_unlock_bh(&addrconf_hash_lock);
3828 }
3829
3830 write_lock_bh(&idev->lock);
3831
3832 addrconf_del_rs_timer(idev);
3833
3834 /* Step 2: clear flags for stateless addrconf, repeated down
3835 * detection
3836 */
3837 was_ready = idev->if_flags & IF_READY;
3838 if (!how)
3839 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3840
3841 /* Step 3: clear tempaddr list */
3842 while (!list_empty(&idev->tempaddr_list)) {
3843 ifa = list_first_entry(&idev->tempaddr_list,
3844 struct inet6_ifaddr, tmp_list);
3845 list_del(&ifa->tmp_list);
3846 write_unlock_bh(&idev->lock);
3847 spin_lock_bh(&ifa->lock);
3848
3849 if (ifa->ifpub) {
3850 in6_ifa_put(ifa->ifpub);
3851 ifa->ifpub = NULL;
3852 }
3853 spin_unlock_bh(&ifa->lock);
3854 in6_ifa_put(ifa);
3855 write_lock_bh(&idev->lock);
3856 }
3857
3858 list_for_each_entry(ifa, &idev->addr_list, if_list)
3859 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3860 write_unlock_bh(&idev->lock);
3861
3862 while (!list_empty(&tmp_addr_list)) {
3863 struct fib6_info *rt = NULL;
3864 bool keep;
3865
3866 ifa = list_first_entry(&tmp_addr_list,
3867 struct inet6_ifaddr, if_list_aux);
3868 list_del(&ifa->if_list_aux);
3869
3870 addrconf_del_dad_work(ifa);
3871
3872 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3873 !addr_is_local(&ifa->addr);
3874
3875 spin_lock_bh(&ifa->lock);
3876
3877 if (keep) {
3878 /* set state to skip the notifier below */
3879 state = INET6_IFADDR_STATE_DEAD;
3880 ifa->state = INET6_IFADDR_STATE_PREDAD;
3881 if (!(ifa->flags & IFA_F_NODAD))
3882 ifa->flags |= IFA_F_TENTATIVE;
3883
3884 rt = ifa->rt;
3885 ifa->rt = NULL;
3886 } else {
3887 state = ifa->state;
3888 ifa->state = INET6_IFADDR_STATE_DEAD;
3889 }
3890
3891 spin_unlock_bh(&ifa->lock);
3892
3893 if (rt)
3894 ip6_del_rt(net, rt);
3895
3896 if (state != INET6_IFADDR_STATE_DEAD) {
3897 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3898 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3899 } else {
3900 if (idev->cnf.forwarding)
3901 addrconf_leave_anycast(ifa);
3902 addrconf_leave_solict(ifa->idev, &ifa->addr);
3903 }
3904
3905 if (!keep) {
3906 write_lock_bh(&idev->lock);
3907 list_del_rcu(&ifa->if_list);
3908 write_unlock_bh(&idev->lock);
3909 in6_ifa_put(ifa);
3910 }
3911 }
3912
3913 /* Step 5: Discard anycast and multicast list */
3914 if (how) {
3915 ipv6_ac_destroy_dev(idev);
3916 ipv6_mc_destroy_dev(idev);
3917 } else if (was_ready) {
3918 ipv6_mc_down(idev);
3919 }
3920
3921 idev->tstamp = jiffies;
3922
3923 /* Last: Shot the device (if unregistered) */
3924 if (how) {
3925 addrconf_sysctl_unregister(idev);
3926 neigh_parms_release(&nd_tbl, idev->nd_parms);
3927 neigh_ifdown(&nd_tbl, dev);
3928 in6_dev_put(idev);
3929 }
3930 return 0;
3931 }
3932
addrconf_rs_timer(struct timer_list * t)3933 static void addrconf_rs_timer(struct timer_list *t)
3934 {
3935 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3936 struct net_device *dev = idev->dev;
3937 struct in6_addr lladdr;
3938
3939 write_lock(&idev->lock);
3940 if (idev->dead || !(idev->if_flags & IF_READY))
3941 goto out;
3942
3943 if (!ipv6_accept_ra(idev))
3944 goto out;
3945
3946 /* Announcement received after solicitation was sent */
3947 if (idev->if_flags & IF_RA_RCVD)
3948 goto out;
3949
3950 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3951 write_unlock(&idev->lock);
3952 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3953 ndisc_send_rs(dev, &lladdr,
3954 &in6addr_linklocal_allrouters);
3955 else
3956 goto put;
3957
3958 write_lock(&idev->lock);
3959 idev->rs_interval = rfc3315_s14_backoff_update(
3960 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3961 /* The wait after the last probe can be shorter */
3962 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3963 idev->cnf.rtr_solicits) ?
3964 idev->cnf.rtr_solicit_delay :
3965 idev->rs_interval);
3966 } else {
3967 /*
3968 * Note: we do not support deprecated "all on-link"
3969 * assumption any longer.
3970 */
3971 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3972 }
3973
3974 out:
3975 write_unlock(&idev->lock);
3976 put:
3977 in6_dev_put(idev);
3978 }
3979
3980 /*
3981 * Duplicate Address Detection
3982 */
addrconf_dad_kick(struct inet6_ifaddr * ifp)3983 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3984 {
3985 unsigned long rand_num;
3986 struct inet6_dev *idev = ifp->idev;
3987 u64 nonce;
3988
3989 if (ifp->flags & IFA_F_OPTIMISTIC)
3990 rand_num = 0;
3991 else
3992 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3993
3994 nonce = 0;
3995 if (idev->cnf.enhanced_dad ||
3996 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3997 do
3998 get_random_bytes(&nonce, 6);
3999 while (nonce == 0);
4000 }
4001 ifp->dad_nonce = nonce;
4002 ifp->dad_probes = idev->cnf.dad_transmits;
4003 addrconf_mod_dad_work(ifp, rand_num);
4004 }
4005
addrconf_dad_begin(struct inet6_ifaddr * ifp)4006 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
4007 {
4008 struct inet6_dev *idev = ifp->idev;
4009 struct net_device *dev = idev->dev;
4010 bool bump_id, notify = false;
4011 struct net *net;
4012
4013 addrconf_join_solict(dev, &ifp->addr);
4014
4015 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
4016
4017 read_lock_bh(&idev->lock);
4018 spin_lock(&ifp->lock);
4019 if (ifp->state == INET6_IFADDR_STATE_DEAD)
4020 goto out;
4021
4022 net = dev_net(dev);
4023 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
4024 (net->ipv6.devconf_all->accept_dad < 1 &&
4025 idev->cnf.accept_dad < 1) ||
4026 !(ifp->flags&IFA_F_TENTATIVE) ||
4027 ifp->flags & IFA_F_NODAD) {
4028 bool send_na = false;
4029
4030 if (ifp->flags & IFA_F_TENTATIVE &&
4031 !(ifp->flags & IFA_F_OPTIMISTIC))
4032 send_na = true;
4033 bump_id = ifp->flags & IFA_F_TENTATIVE;
4034 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4035 spin_unlock(&ifp->lock);
4036 read_unlock_bh(&idev->lock);
4037
4038 addrconf_dad_completed(ifp, bump_id, send_na);
4039 return;
4040 }
4041
4042 if (!(idev->if_flags & IF_READY)) {
4043 spin_unlock(&ifp->lock);
4044 read_unlock_bh(&idev->lock);
4045 /*
4046 * If the device is not ready:
4047 * - keep it tentative if it is a permanent address.
4048 * - otherwise, kill it.
4049 */
4050 in6_ifa_hold(ifp);
4051 addrconf_dad_stop(ifp, 0);
4052 return;
4053 }
4054
4055 /*
4056 * Optimistic nodes can start receiving
4057 * Frames right away
4058 */
4059 if (ifp->flags & IFA_F_OPTIMISTIC) {
4060 ip6_ins_rt(net, ifp->rt);
4061 if (ipv6_use_optimistic_addr(net, idev)) {
4062 /* Because optimistic nodes can use this address,
4063 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4064 */
4065 notify = true;
4066 }
4067 }
4068
4069 addrconf_dad_kick(ifp);
4070 out:
4071 spin_unlock(&ifp->lock);
4072 read_unlock_bh(&idev->lock);
4073 if (notify)
4074 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4075 }
4076
addrconf_dad_start(struct inet6_ifaddr * ifp)4077 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4078 {
4079 bool begin_dad = false;
4080
4081 spin_lock_bh(&ifp->lock);
4082 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4083 ifp->state = INET6_IFADDR_STATE_PREDAD;
4084 begin_dad = true;
4085 }
4086 spin_unlock_bh(&ifp->lock);
4087
4088 if (begin_dad)
4089 addrconf_mod_dad_work(ifp, 0);
4090 }
4091
addrconf_dad_work(struct work_struct * w)4092 static void addrconf_dad_work(struct work_struct *w)
4093 {
4094 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4095 struct inet6_ifaddr,
4096 dad_work);
4097 struct inet6_dev *idev = ifp->idev;
4098 bool bump_id, disable_ipv6 = false;
4099 struct in6_addr mcaddr;
4100
4101 enum {
4102 DAD_PROCESS,
4103 DAD_BEGIN,
4104 DAD_ABORT,
4105 } action = DAD_PROCESS;
4106
4107 rtnl_lock();
4108
4109 spin_lock_bh(&ifp->lock);
4110 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4111 action = DAD_BEGIN;
4112 ifp->state = INET6_IFADDR_STATE_DAD;
4113 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4114 action = DAD_ABORT;
4115 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4116
4117 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4118 idev->cnf.accept_dad > 1) &&
4119 !idev->cnf.disable_ipv6 &&
4120 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4121 struct in6_addr addr;
4122
4123 addr.s6_addr32[0] = htonl(0xfe800000);
4124 addr.s6_addr32[1] = 0;
4125
4126 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4127 ipv6_addr_equal(&ifp->addr, &addr)) {
4128 /* DAD failed for link-local based on MAC */
4129 idev->cnf.disable_ipv6 = 1;
4130
4131 pr_info("%s: IPv6 being disabled!\n",
4132 ifp->idev->dev->name);
4133 disable_ipv6 = true;
4134 }
4135 }
4136 }
4137 spin_unlock_bh(&ifp->lock);
4138
4139 if (action == DAD_BEGIN) {
4140 addrconf_dad_begin(ifp);
4141 goto out;
4142 } else if (action == DAD_ABORT) {
4143 in6_ifa_hold(ifp);
4144 addrconf_dad_stop(ifp, 1);
4145 if (disable_ipv6)
4146 addrconf_ifdown(idev->dev, 0);
4147 goto out;
4148 }
4149
4150 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4151 goto out;
4152
4153 write_lock_bh(&idev->lock);
4154 if (idev->dead || !(idev->if_flags & IF_READY)) {
4155 write_unlock_bh(&idev->lock);
4156 goto out;
4157 }
4158
4159 spin_lock(&ifp->lock);
4160 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4161 spin_unlock(&ifp->lock);
4162 write_unlock_bh(&idev->lock);
4163 goto out;
4164 }
4165
4166 if (ifp->dad_probes == 0) {
4167 bool send_na = false;
4168
4169 /*
4170 * DAD was successful
4171 */
4172
4173 if (ifp->flags & IFA_F_TENTATIVE &&
4174 !(ifp->flags & IFA_F_OPTIMISTIC))
4175 send_na = true;
4176 bump_id = ifp->flags & IFA_F_TENTATIVE;
4177 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4178 spin_unlock(&ifp->lock);
4179 write_unlock_bh(&idev->lock);
4180
4181 addrconf_dad_completed(ifp, bump_id, send_na);
4182
4183 goto out;
4184 }
4185
4186 ifp->dad_probes--;
4187 addrconf_mod_dad_work(ifp,
4188 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4189 spin_unlock(&ifp->lock);
4190 write_unlock_bh(&idev->lock);
4191
4192 /* send a neighbour solicitation for our addr */
4193 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4194 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4195 ifp->dad_nonce);
4196 out:
4197 in6_ifa_put(ifp);
4198 rtnl_unlock();
4199 }
4200
4201 /* ifp->idev must be at least read locked */
ipv6_lonely_lladdr(struct inet6_ifaddr * ifp)4202 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4203 {
4204 struct inet6_ifaddr *ifpiter;
4205 struct inet6_dev *idev = ifp->idev;
4206
4207 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4208 if (ifpiter->scope > IFA_LINK)
4209 break;
4210 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4211 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4212 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4213 IFA_F_PERMANENT)
4214 return false;
4215 }
4216 return true;
4217 }
4218
addrconf_dad_completed(struct inet6_ifaddr * ifp,bool bump_id,bool send_na)4219 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4220 bool send_na)
4221 {
4222 struct net_device *dev = ifp->idev->dev;
4223 struct in6_addr lladdr;
4224 bool send_rs, send_mld;
4225
4226 addrconf_del_dad_work(ifp);
4227
4228 /*
4229 * Configure the address for reception. Now it is valid.
4230 */
4231
4232 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4233
4234 /* If added prefix is link local and we are prepared to process
4235 router advertisements, start sending router solicitations.
4236 */
4237
4238 read_lock_bh(&ifp->idev->lock);
4239 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4240 send_rs = send_mld &&
4241 ipv6_accept_ra(ifp->idev) &&
4242 ifp->idev->cnf.rtr_solicits != 0 &&
4243 (dev->flags & IFF_LOOPBACK) == 0 &&
4244 (dev->type != ARPHRD_TUNNEL);
4245 read_unlock_bh(&ifp->idev->lock);
4246
4247 /* While dad is in progress mld report's source address is in6_addrany.
4248 * Resend with proper ll now.
4249 */
4250 if (send_mld)
4251 ipv6_mc_dad_complete(ifp->idev);
4252
4253 /* send unsolicited NA if enabled */
4254 if (send_na &&
4255 (ifp->idev->cnf.ndisc_notify ||
4256 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4257 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4258 /*router=*/ !!ifp->idev->cnf.forwarding,
4259 /*solicited=*/ false, /*override=*/ true,
4260 /*inc_opt=*/ true);
4261 }
4262
4263 if (send_rs) {
4264 /*
4265 * If a host as already performed a random delay
4266 * [...] as part of DAD [...] there is no need
4267 * to delay again before sending the first RS
4268 */
4269 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4270 return;
4271 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4272
4273 write_lock_bh(&ifp->idev->lock);
4274 spin_lock(&ifp->lock);
4275 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4276 ifp->idev->cnf.rtr_solicit_interval);
4277 ifp->idev->rs_probes = 1;
4278 ifp->idev->if_flags |= IF_RS_SENT;
4279 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4280 spin_unlock(&ifp->lock);
4281 write_unlock_bh(&ifp->idev->lock);
4282 }
4283
4284 if (bump_id)
4285 rt_genid_bump_ipv6(dev_net(dev));
4286
4287 /* Make sure that a new temporary address will be created
4288 * before this temporary address becomes deprecated.
4289 */
4290 if (ifp->flags & IFA_F_TEMPORARY)
4291 addrconf_verify_rtnl();
4292 }
4293
addrconf_dad_run(struct inet6_dev * idev,bool restart)4294 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4295 {
4296 struct inet6_ifaddr *ifp;
4297
4298 read_lock_bh(&idev->lock);
4299 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4300 spin_lock(&ifp->lock);
4301 if ((ifp->flags & IFA_F_TENTATIVE &&
4302 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4303 if (restart)
4304 ifp->state = INET6_IFADDR_STATE_PREDAD;
4305 addrconf_dad_kick(ifp);
4306 }
4307 spin_unlock(&ifp->lock);
4308 }
4309 read_unlock_bh(&idev->lock);
4310 }
4311
4312 #ifdef CONFIG_PROC_FS
4313 struct if6_iter_state {
4314 struct seq_net_private p;
4315 int bucket;
4316 int offset;
4317 };
4318
if6_get_first(struct seq_file * seq,loff_t pos)4319 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4320 {
4321 struct if6_iter_state *state = seq->private;
4322 struct net *net = seq_file_net(seq);
4323 struct inet6_ifaddr *ifa = NULL;
4324 int p = 0;
4325
4326 /* initial bucket if pos is 0 */
4327 if (pos == 0) {
4328 state->bucket = 0;
4329 state->offset = 0;
4330 }
4331
4332 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4333 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4334 addr_lst) {
4335 if (!net_eq(dev_net(ifa->idev->dev), net))
4336 continue;
4337 /* sync with offset */
4338 if (p < state->offset) {
4339 p++;
4340 continue;
4341 }
4342 return ifa;
4343 }
4344
4345 /* prepare for next bucket */
4346 state->offset = 0;
4347 p = 0;
4348 }
4349 return NULL;
4350 }
4351
if6_get_next(struct seq_file * seq,struct inet6_ifaddr * ifa)4352 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4353 struct inet6_ifaddr *ifa)
4354 {
4355 struct if6_iter_state *state = seq->private;
4356 struct net *net = seq_file_net(seq);
4357
4358 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4359 if (!net_eq(dev_net(ifa->idev->dev), net))
4360 continue;
4361 state->offset++;
4362 return ifa;
4363 }
4364
4365 state->offset = 0;
4366 while (++state->bucket < IN6_ADDR_HSIZE) {
4367 hlist_for_each_entry_rcu(ifa,
4368 &inet6_addr_lst[state->bucket], addr_lst) {
4369 if (!net_eq(dev_net(ifa->idev->dev), net))
4370 continue;
4371 return ifa;
4372 }
4373 }
4374
4375 return NULL;
4376 }
4377
if6_seq_start(struct seq_file * seq,loff_t * pos)4378 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4379 __acquires(rcu)
4380 {
4381 rcu_read_lock();
4382 return if6_get_first(seq, *pos);
4383 }
4384
if6_seq_next(struct seq_file * seq,void * v,loff_t * pos)4385 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4386 {
4387 struct inet6_ifaddr *ifa;
4388
4389 ifa = if6_get_next(seq, v);
4390 ++*pos;
4391 return ifa;
4392 }
4393
if6_seq_stop(struct seq_file * seq,void * v)4394 static void if6_seq_stop(struct seq_file *seq, void *v)
4395 __releases(rcu)
4396 {
4397 rcu_read_unlock();
4398 }
4399
if6_seq_show(struct seq_file * seq,void * v)4400 static int if6_seq_show(struct seq_file *seq, void *v)
4401 {
4402 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4403 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4404 &ifp->addr,
4405 ifp->idev->dev->ifindex,
4406 ifp->prefix_len,
4407 ifp->scope,
4408 (u8) ifp->flags,
4409 ifp->idev->dev->name);
4410 return 0;
4411 }
4412
4413 static const struct seq_operations if6_seq_ops = {
4414 .start = if6_seq_start,
4415 .next = if6_seq_next,
4416 .show = if6_seq_show,
4417 .stop = if6_seq_stop,
4418 };
4419
if6_proc_net_init(struct net * net)4420 static int __net_init if6_proc_net_init(struct net *net)
4421 {
4422 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4423 sizeof(struct if6_iter_state)))
4424 return -ENOMEM;
4425 return 0;
4426 }
4427
if6_proc_net_exit(struct net * net)4428 static void __net_exit if6_proc_net_exit(struct net *net)
4429 {
4430 remove_proc_entry("if_inet6", net->proc_net);
4431 }
4432
4433 static struct pernet_operations if6_proc_net_ops = {
4434 .init = if6_proc_net_init,
4435 .exit = if6_proc_net_exit,
4436 };
4437
if6_proc_init(void)4438 int __init if6_proc_init(void)
4439 {
4440 return register_pernet_subsys(&if6_proc_net_ops);
4441 }
4442
if6_proc_exit(void)4443 void if6_proc_exit(void)
4444 {
4445 unregister_pernet_subsys(&if6_proc_net_ops);
4446 }
4447 #endif /* CONFIG_PROC_FS */
4448
4449 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4450 /* Check if address is a home address configured on any interface. */
ipv6_chk_home_addr(struct net * net,const struct in6_addr * addr)4451 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4452 {
4453 unsigned int hash = inet6_addr_hash(net, addr);
4454 struct inet6_ifaddr *ifp = NULL;
4455 int ret = 0;
4456
4457 rcu_read_lock();
4458 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4459 if (!net_eq(dev_net(ifp->idev->dev), net))
4460 continue;
4461 if (ipv6_addr_equal(&ifp->addr, addr) &&
4462 (ifp->flags & IFA_F_HOMEADDRESS)) {
4463 ret = 1;
4464 break;
4465 }
4466 }
4467 rcu_read_unlock();
4468 return ret;
4469 }
4470 #endif
4471
4472 /*
4473 * Periodic address status verification
4474 */
4475
addrconf_verify_rtnl(void)4476 static void addrconf_verify_rtnl(void)
4477 {
4478 unsigned long now, next, next_sec, next_sched;
4479 struct inet6_ifaddr *ifp;
4480 int i;
4481
4482 ASSERT_RTNL();
4483
4484 rcu_read_lock_bh();
4485 now = jiffies;
4486 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4487
4488 cancel_delayed_work(&addr_chk_work);
4489
4490 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4491 restart:
4492 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4493 unsigned long age;
4494
4495 /* When setting preferred_lft to a value not zero or
4496 * infinity, while valid_lft is infinity
4497 * IFA_F_PERMANENT has a non-infinity life time.
4498 */
4499 if ((ifp->flags & IFA_F_PERMANENT) &&
4500 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4501 continue;
4502
4503 spin_lock(&ifp->lock);
4504 /* We try to batch several events at once. */
4505 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4506
4507 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4508 age >= ifp->valid_lft) {
4509 spin_unlock(&ifp->lock);
4510 in6_ifa_hold(ifp);
4511 ipv6_del_addr(ifp);
4512 goto restart;
4513 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4514 spin_unlock(&ifp->lock);
4515 continue;
4516 } else if (age >= ifp->prefered_lft) {
4517 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4518 int deprecate = 0;
4519
4520 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4521 deprecate = 1;
4522 ifp->flags |= IFA_F_DEPRECATED;
4523 }
4524
4525 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4526 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4527 next = ifp->tstamp + ifp->valid_lft * HZ;
4528
4529 spin_unlock(&ifp->lock);
4530
4531 if (deprecate) {
4532 in6_ifa_hold(ifp);
4533
4534 ipv6_ifa_notify(0, ifp);
4535 in6_ifa_put(ifp);
4536 goto restart;
4537 }
4538 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4539 !(ifp->flags&IFA_F_TENTATIVE)) {
4540 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4541 ifp->idev->cnf.dad_transmits *
4542 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4543
4544 if (age >= ifp->prefered_lft - regen_advance) {
4545 struct inet6_ifaddr *ifpub = ifp->ifpub;
4546 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4547 next = ifp->tstamp + ifp->prefered_lft * HZ;
4548 if (!ifp->regen_count && ifpub) {
4549 ifp->regen_count++;
4550 in6_ifa_hold(ifp);
4551 in6_ifa_hold(ifpub);
4552 spin_unlock(&ifp->lock);
4553
4554 spin_lock(&ifpub->lock);
4555 ifpub->regen_count = 0;
4556 spin_unlock(&ifpub->lock);
4557 rcu_read_unlock_bh();
4558 ipv6_create_tempaddr(ifpub, ifp, true);
4559 in6_ifa_put(ifpub);
4560 in6_ifa_put(ifp);
4561 rcu_read_lock_bh();
4562 goto restart;
4563 }
4564 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4565 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4566 spin_unlock(&ifp->lock);
4567 } else {
4568 /* ifp->prefered_lft <= ifp->valid_lft */
4569 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4570 next = ifp->tstamp + ifp->prefered_lft * HZ;
4571 spin_unlock(&ifp->lock);
4572 }
4573 }
4574 }
4575
4576 next_sec = round_jiffies_up(next);
4577 next_sched = next;
4578
4579 /* If rounded timeout is accurate enough, accept it. */
4580 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4581 next_sched = next_sec;
4582
4583 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4584 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4585 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4586
4587 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4588 now, next, next_sec, next_sched);
4589 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4590 rcu_read_unlock_bh();
4591 }
4592
addrconf_verify_work(struct work_struct * w)4593 static void addrconf_verify_work(struct work_struct *w)
4594 {
4595 rtnl_lock();
4596 addrconf_verify_rtnl();
4597 rtnl_unlock();
4598 }
4599
addrconf_verify(void)4600 static void addrconf_verify(void)
4601 {
4602 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4603 }
4604
extract_addr(struct nlattr * addr,struct nlattr * local,struct in6_addr ** peer_pfx)4605 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4606 struct in6_addr **peer_pfx)
4607 {
4608 struct in6_addr *pfx = NULL;
4609
4610 *peer_pfx = NULL;
4611
4612 if (addr)
4613 pfx = nla_data(addr);
4614
4615 if (local) {
4616 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4617 *peer_pfx = pfx;
4618 pfx = nla_data(local);
4619 }
4620
4621 return pfx;
4622 }
4623
4624 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4625 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4626 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4627 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4628 [IFA_FLAGS] = { .len = sizeof(u32) },
4629 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4630 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4631 };
4632
4633 static int
inet6_rtm_deladdr(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4634 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4635 struct netlink_ext_ack *extack)
4636 {
4637 struct net *net = sock_net(skb->sk);
4638 struct ifaddrmsg *ifm;
4639 struct nlattr *tb[IFA_MAX+1];
4640 struct in6_addr *pfx, *peer_pfx;
4641 u32 ifa_flags;
4642 int err;
4643
4644 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4645 ifa_ipv6_policy, extack);
4646 if (err < 0)
4647 return err;
4648
4649 ifm = nlmsg_data(nlh);
4650 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4651 if (!pfx)
4652 return -EINVAL;
4653
4654 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4655
4656 /* We ignore other flags so far. */
4657 ifa_flags &= IFA_F_MANAGETEMPADDR;
4658
4659 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4660 ifm->ifa_prefixlen);
4661 }
4662
modify_prefix_route(struct inet6_ifaddr * ifp,unsigned long expires,u32 flags,bool modify_peer)4663 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4664 unsigned long expires, u32 flags,
4665 bool modify_peer)
4666 {
4667 struct fib6_info *f6i;
4668 u32 prio;
4669
4670 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4671 ifp->prefix_len,
4672 ifp->idev->dev, 0, RTF_DEFAULT, true);
4673 if (!f6i)
4674 return -ENOENT;
4675
4676 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4677 if (f6i->fib6_metric != prio) {
4678 /* delete old one */
4679 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4680
4681 /* add new one */
4682 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4683 ifp->prefix_len,
4684 ifp->rt_priority, ifp->idev->dev,
4685 expires, flags, GFP_KERNEL);
4686 } else {
4687 if (!expires)
4688 fib6_clean_expires(f6i);
4689 else
4690 fib6_set_expires(f6i, expires);
4691
4692 fib6_info_release(f6i);
4693 }
4694
4695 return 0;
4696 }
4697
inet6_addr_modify(struct inet6_ifaddr * ifp,struct ifa6_config * cfg)4698 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4699 {
4700 u32 flags;
4701 clock_t expires;
4702 unsigned long timeout;
4703 bool was_managetempaddr;
4704 bool had_prefixroute;
4705 bool new_peer = false;
4706
4707 ASSERT_RTNL();
4708
4709 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4710 return -EINVAL;
4711
4712 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4713 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4714 return -EINVAL;
4715
4716 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4717 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4718
4719 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4720 if (addrconf_finite_timeout(timeout)) {
4721 expires = jiffies_to_clock_t(timeout * HZ);
4722 cfg->valid_lft = timeout;
4723 flags = RTF_EXPIRES;
4724 } else {
4725 expires = 0;
4726 flags = 0;
4727 cfg->ifa_flags |= IFA_F_PERMANENT;
4728 }
4729
4730 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4731 if (addrconf_finite_timeout(timeout)) {
4732 if (timeout == 0)
4733 cfg->ifa_flags |= IFA_F_DEPRECATED;
4734 cfg->preferred_lft = timeout;
4735 }
4736
4737 if (cfg->peer_pfx &&
4738 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4739 if (!ipv6_addr_any(&ifp->peer_addr))
4740 cleanup_prefix_route(ifp, expires, true, true);
4741 new_peer = true;
4742 }
4743
4744 spin_lock_bh(&ifp->lock);
4745 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4746 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4747 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4748 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4749 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4750 IFA_F_NOPREFIXROUTE);
4751 ifp->flags |= cfg->ifa_flags;
4752 ifp->tstamp = jiffies;
4753 ifp->valid_lft = cfg->valid_lft;
4754 ifp->prefered_lft = cfg->preferred_lft;
4755
4756 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4757 ifp->rt_priority = cfg->rt_priority;
4758
4759 if (new_peer)
4760 ifp->peer_addr = *cfg->peer_pfx;
4761
4762 spin_unlock_bh(&ifp->lock);
4763 if (!(ifp->flags&IFA_F_TENTATIVE))
4764 ipv6_ifa_notify(0, ifp);
4765
4766 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4767 int rc = -ENOENT;
4768
4769 if (had_prefixroute)
4770 rc = modify_prefix_route(ifp, expires, flags, false);
4771
4772 /* prefix route could have been deleted; if so restore it */
4773 if (rc == -ENOENT) {
4774 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4775 ifp->rt_priority, ifp->idev->dev,
4776 expires, flags, GFP_KERNEL);
4777 }
4778
4779 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4780 rc = modify_prefix_route(ifp, expires, flags, true);
4781
4782 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4783 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4784 ifp->rt_priority, ifp->idev->dev,
4785 expires, flags, GFP_KERNEL);
4786 }
4787 } else if (had_prefixroute) {
4788 enum cleanup_prefix_rt_t action;
4789 unsigned long rt_expires;
4790
4791 write_lock_bh(&ifp->idev->lock);
4792 action = check_cleanup_prefix_route(ifp, &rt_expires);
4793 write_unlock_bh(&ifp->idev->lock);
4794
4795 if (action != CLEANUP_PREFIX_RT_NOP) {
4796 cleanup_prefix_route(ifp, rt_expires,
4797 action == CLEANUP_PREFIX_RT_DEL, false);
4798 }
4799 }
4800
4801 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4802 if (was_managetempaddr &&
4803 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4804 cfg->valid_lft = 0;
4805 cfg->preferred_lft = 0;
4806 }
4807 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4808 cfg->preferred_lft, !was_managetempaddr,
4809 jiffies);
4810 }
4811
4812 addrconf_verify_rtnl();
4813
4814 return 0;
4815 }
4816
4817 static int
inet6_rtm_newaddr(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4818 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4819 struct netlink_ext_ack *extack)
4820 {
4821 struct net *net = sock_net(skb->sk);
4822 struct ifaddrmsg *ifm;
4823 struct nlattr *tb[IFA_MAX+1];
4824 struct in6_addr *peer_pfx;
4825 struct inet6_ifaddr *ifa;
4826 struct net_device *dev;
4827 struct inet6_dev *idev;
4828 struct ifa6_config cfg;
4829 int err;
4830
4831 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4832 ifa_ipv6_policy, extack);
4833 if (err < 0)
4834 return err;
4835
4836 memset(&cfg, 0, sizeof(cfg));
4837
4838 ifm = nlmsg_data(nlh);
4839 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4840 if (!cfg.pfx)
4841 return -EINVAL;
4842
4843 cfg.peer_pfx = peer_pfx;
4844 cfg.plen = ifm->ifa_prefixlen;
4845 if (tb[IFA_RT_PRIORITY])
4846 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4847
4848 cfg.valid_lft = INFINITY_LIFE_TIME;
4849 cfg.preferred_lft = INFINITY_LIFE_TIME;
4850
4851 if (tb[IFA_CACHEINFO]) {
4852 struct ifa_cacheinfo *ci;
4853
4854 ci = nla_data(tb[IFA_CACHEINFO]);
4855 cfg.valid_lft = ci->ifa_valid;
4856 cfg.preferred_lft = ci->ifa_prefered;
4857 }
4858
4859 dev = __dev_get_by_index(net, ifm->ifa_index);
4860 if (!dev)
4861 return -ENODEV;
4862
4863 if (tb[IFA_FLAGS])
4864 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4865 else
4866 cfg.ifa_flags = ifm->ifa_flags;
4867
4868 /* We ignore other flags so far. */
4869 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4870 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4871 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4872
4873 idev = ipv6_find_idev(dev);
4874 if (IS_ERR(idev))
4875 return PTR_ERR(idev);
4876
4877 if (!ipv6_allow_optimistic_dad(net, idev))
4878 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4879
4880 if (cfg.ifa_flags & IFA_F_NODAD &&
4881 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4882 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4883 return -EINVAL;
4884 }
4885
4886 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4887 if (!ifa) {
4888 /*
4889 * It would be best to check for !NLM_F_CREATE here but
4890 * userspace already relies on not having to provide this.
4891 */
4892 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4893 }
4894
4895 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4896 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4897 err = -EEXIST;
4898 else
4899 err = inet6_addr_modify(ifa, &cfg);
4900
4901 in6_ifa_put(ifa);
4902
4903 return err;
4904 }
4905
put_ifaddrmsg(struct nlmsghdr * nlh,u8 prefixlen,u32 flags,u8 scope,int ifindex)4906 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4907 u8 scope, int ifindex)
4908 {
4909 struct ifaddrmsg *ifm;
4910
4911 ifm = nlmsg_data(nlh);
4912 ifm->ifa_family = AF_INET6;
4913 ifm->ifa_prefixlen = prefixlen;
4914 ifm->ifa_flags = flags;
4915 ifm->ifa_scope = scope;
4916 ifm->ifa_index = ifindex;
4917 }
4918
put_cacheinfo(struct sk_buff * skb,unsigned long cstamp,unsigned long tstamp,u32 preferred,u32 valid)4919 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4920 unsigned long tstamp, u32 preferred, u32 valid)
4921 {
4922 struct ifa_cacheinfo ci;
4923
4924 ci.cstamp = cstamp_delta(cstamp);
4925 ci.tstamp = cstamp_delta(tstamp);
4926 ci.ifa_prefered = preferred;
4927 ci.ifa_valid = valid;
4928
4929 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4930 }
4931
rt_scope(int ifa_scope)4932 static inline int rt_scope(int ifa_scope)
4933 {
4934 if (ifa_scope & IFA_HOST)
4935 return RT_SCOPE_HOST;
4936 else if (ifa_scope & IFA_LINK)
4937 return RT_SCOPE_LINK;
4938 else if (ifa_scope & IFA_SITE)
4939 return RT_SCOPE_SITE;
4940 else
4941 return RT_SCOPE_UNIVERSE;
4942 }
4943
inet6_ifaddr_msgsize(void)4944 static inline int inet6_ifaddr_msgsize(void)
4945 {
4946 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4947 + nla_total_size(16) /* IFA_LOCAL */
4948 + nla_total_size(16) /* IFA_ADDRESS */
4949 + nla_total_size(sizeof(struct ifa_cacheinfo))
4950 + nla_total_size(4) /* IFA_FLAGS */
4951 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4952 }
4953
4954 enum addr_type_t {
4955 UNICAST_ADDR,
4956 MULTICAST_ADDR,
4957 ANYCAST_ADDR,
4958 };
4959
4960 struct inet6_fill_args {
4961 u32 portid;
4962 u32 seq;
4963 int event;
4964 unsigned int flags;
4965 int netnsid;
4966 int ifindex;
4967 enum addr_type_t type;
4968 };
4969
inet6_fill_ifaddr(struct sk_buff * skb,struct inet6_ifaddr * ifa,struct inet6_fill_args * args)4970 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4971 struct inet6_fill_args *args)
4972 {
4973 struct nlmsghdr *nlh;
4974 u32 preferred, valid;
4975
4976 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4977 sizeof(struct ifaddrmsg), args->flags);
4978 if (!nlh)
4979 return -EMSGSIZE;
4980
4981 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4982 ifa->idev->dev->ifindex);
4983
4984 if (args->netnsid >= 0 &&
4985 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4986 goto error;
4987
4988 spin_lock_bh(&ifa->lock);
4989 if (!((ifa->flags&IFA_F_PERMANENT) &&
4990 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4991 preferred = ifa->prefered_lft;
4992 valid = ifa->valid_lft;
4993 if (preferred != INFINITY_LIFE_TIME) {
4994 long tval = (jiffies - ifa->tstamp)/HZ;
4995 if (preferred > tval)
4996 preferred -= tval;
4997 else
4998 preferred = 0;
4999 if (valid != INFINITY_LIFE_TIME) {
5000 if (valid > tval)
5001 valid -= tval;
5002 else
5003 valid = 0;
5004 }
5005 }
5006 } else {
5007 preferred = INFINITY_LIFE_TIME;
5008 valid = INFINITY_LIFE_TIME;
5009 }
5010 spin_unlock_bh(&ifa->lock);
5011
5012 if (!ipv6_addr_any(&ifa->peer_addr)) {
5013 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5014 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5015 goto error;
5016 } else
5017 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5018 goto error;
5019
5020 if (ifa->rt_priority &&
5021 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5022 goto error;
5023
5024 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5025 goto error;
5026
5027 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5028 goto error;
5029
5030 nlmsg_end(skb, nlh);
5031 return 0;
5032
5033 error:
5034 nlmsg_cancel(skb, nlh);
5035 return -EMSGSIZE;
5036 }
5037
inet6_fill_ifmcaddr(struct sk_buff * skb,struct ifmcaddr6 * ifmca,struct inet6_fill_args * args)5038 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5039 struct inet6_fill_args *args)
5040 {
5041 struct nlmsghdr *nlh;
5042 u8 scope = RT_SCOPE_UNIVERSE;
5043 int ifindex = ifmca->idev->dev->ifindex;
5044
5045 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5046 scope = RT_SCOPE_SITE;
5047
5048 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5049 sizeof(struct ifaddrmsg), args->flags);
5050 if (!nlh)
5051 return -EMSGSIZE;
5052
5053 if (args->netnsid >= 0 &&
5054 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5055 nlmsg_cancel(skb, nlh);
5056 return -EMSGSIZE;
5057 }
5058
5059 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5060 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5061 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5062 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5063 nlmsg_cancel(skb, nlh);
5064 return -EMSGSIZE;
5065 }
5066
5067 nlmsg_end(skb, nlh);
5068 return 0;
5069 }
5070
inet6_fill_ifacaddr(struct sk_buff * skb,struct ifacaddr6 * ifaca,struct inet6_fill_args * args)5071 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5072 struct inet6_fill_args *args)
5073 {
5074 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5075 int ifindex = dev ? dev->ifindex : 1;
5076 struct nlmsghdr *nlh;
5077 u8 scope = RT_SCOPE_UNIVERSE;
5078
5079 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5080 scope = RT_SCOPE_SITE;
5081
5082 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5083 sizeof(struct ifaddrmsg), args->flags);
5084 if (!nlh)
5085 return -EMSGSIZE;
5086
5087 if (args->netnsid >= 0 &&
5088 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5089 nlmsg_cancel(skb, nlh);
5090 return -EMSGSIZE;
5091 }
5092
5093 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5094 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5095 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5096 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5097 nlmsg_cancel(skb, nlh);
5098 return -EMSGSIZE;
5099 }
5100
5101 nlmsg_end(skb, nlh);
5102 return 0;
5103 }
5104
5105 /* called with rcu_read_lock() */
in6_dump_addrs(struct inet6_dev * idev,struct sk_buff * skb,struct netlink_callback * cb,int s_ip_idx,struct inet6_fill_args * fillargs)5106 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5107 struct netlink_callback *cb, int s_ip_idx,
5108 struct inet6_fill_args *fillargs)
5109 {
5110 struct ifmcaddr6 *ifmca;
5111 struct ifacaddr6 *ifaca;
5112 int ip_idx = 0;
5113 int err = 1;
5114
5115 read_lock_bh(&idev->lock);
5116 switch (fillargs->type) {
5117 case UNICAST_ADDR: {
5118 struct inet6_ifaddr *ifa;
5119 fillargs->event = RTM_NEWADDR;
5120
5121 /* unicast address incl. temp addr */
5122 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5123 if (ip_idx < s_ip_idx)
5124 goto next;
5125 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5126 if (err < 0)
5127 break;
5128 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5129 next:
5130 ip_idx++;
5131 }
5132 break;
5133 }
5134 case MULTICAST_ADDR:
5135 fillargs->event = RTM_GETMULTICAST;
5136
5137 /* multicast address */
5138 for (ifmca = idev->mc_list; ifmca;
5139 ifmca = ifmca->next, ip_idx++) {
5140 if (ip_idx < s_ip_idx)
5141 continue;
5142 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5143 if (err < 0)
5144 break;
5145 }
5146 break;
5147 case ANYCAST_ADDR:
5148 fillargs->event = RTM_GETANYCAST;
5149 /* anycast address */
5150 for (ifaca = idev->ac_list; ifaca;
5151 ifaca = ifaca->aca_next, ip_idx++) {
5152 if (ip_idx < s_ip_idx)
5153 continue;
5154 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5155 if (err < 0)
5156 break;
5157 }
5158 break;
5159 default:
5160 break;
5161 }
5162 read_unlock_bh(&idev->lock);
5163 cb->args[2] = ip_idx;
5164 return err;
5165 }
5166
inet6_valid_dump_ifaddr_req(const struct nlmsghdr * nlh,struct inet6_fill_args * fillargs,struct net ** tgt_net,struct sock * sk,struct netlink_callback * cb)5167 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5168 struct inet6_fill_args *fillargs,
5169 struct net **tgt_net, struct sock *sk,
5170 struct netlink_callback *cb)
5171 {
5172 struct netlink_ext_ack *extack = cb->extack;
5173 struct nlattr *tb[IFA_MAX+1];
5174 struct ifaddrmsg *ifm;
5175 int err, i;
5176
5177 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5178 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5179 return -EINVAL;
5180 }
5181
5182 ifm = nlmsg_data(nlh);
5183 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5184 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5185 return -EINVAL;
5186 }
5187
5188 fillargs->ifindex = ifm->ifa_index;
5189 if (fillargs->ifindex) {
5190 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5191 fillargs->flags |= NLM_F_DUMP_FILTERED;
5192 }
5193
5194 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5195 ifa_ipv6_policy, extack);
5196 if (err < 0)
5197 return err;
5198
5199 for (i = 0; i <= IFA_MAX; ++i) {
5200 if (!tb[i])
5201 continue;
5202
5203 if (i == IFA_TARGET_NETNSID) {
5204 struct net *net;
5205
5206 fillargs->netnsid = nla_get_s32(tb[i]);
5207 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5208 if (IS_ERR(net)) {
5209 fillargs->netnsid = -1;
5210 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5211 return PTR_ERR(net);
5212 }
5213 *tgt_net = net;
5214 } else {
5215 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5216 return -EINVAL;
5217 }
5218 }
5219
5220 return 0;
5221 }
5222
inet6_dump_addr(struct sk_buff * skb,struct netlink_callback * cb,enum addr_type_t type)5223 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5224 enum addr_type_t type)
5225 {
5226 const struct nlmsghdr *nlh = cb->nlh;
5227 struct inet6_fill_args fillargs = {
5228 .portid = NETLINK_CB(cb->skb).portid,
5229 .seq = cb->nlh->nlmsg_seq,
5230 .flags = NLM_F_MULTI,
5231 .netnsid = -1,
5232 .type = type,
5233 };
5234 struct net *net = sock_net(skb->sk);
5235 struct net *tgt_net = net;
5236 int idx, s_idx, s_ip_idx;
5237 int h, s_h;
5238 struct net_device *dev;
5239 struct inet6_dev *idev;
5240 struct hlist_head *head;
5241 int err = 0;
5242
5243 s_h = cb->args[0];
5244 s_idx = idx = cb->args[1];
5245 s_ip_idx = cb->args[2];
5246
5247 if (cb->strict_check) {
5248 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5249 skb->sk, cb);
5250 if (err < 0)
5251 goto put_tgt_net;
5252
5253 err = 0;
5254 if (fillargs.ifindex) {
5255 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5256 if (!dev) {
5257 err = -ENODEV;
5258 goto put_tgt_net;
5259 }
5260 idev = __in6_dev_get(dev);
5261 if (idev) {
5262 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5263 &fillargs);
5264 if (err > 0)
5265 err = 0;
5266 }
5267 goto put_tgt_net;
5268 }
5269 }
5270
5271 rcu_read_lock();
5272 cb->seq = inet6_base_seq(tgt_net);
5273 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5274 idx = 0;
5275 head = &tgt_net->dev_index_head[h];
5276 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5277 if (idx < s_idx)
5278 goto cont;
5279 if (h > s_h || idx > s_idx)
5280 s_ip_idx = 0;
5281 idev = __in6_dev_get(dev);
5282 if (!idev)
5283 goto cont;
5284
5285 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5286 &fillargs) < 0)
5287 goto done;
5288 cont:
5289 idx++;
5290 }
5291 }
5292 done:
5293 rcu_read_unlock();
5294 cb->args[0] = h;
5295 cb->args[1] = idx;
5296 put_tgt_net:
5297 if (fillargs.netnsid >= 0)
5298 put_net(tgt_net);
5299
5300 return skb->len ? : err;
5301 }
5302
inet6_dump_ifaddr(struct sk_buff * skb,struct netlink_callback * cb)5303 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5304 {
5305 enum addr_type_t type = UNICAST_ADDR;
5306
5307 return inet6_dump_addr(skb, cb, type);
5308 }
5309
inet6_dump_ifmcaddr(struct sk_buff * skb,struct netlink_callback * cb)5310 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5311 {
5312 enum addr_type_t type = MULTICAST_ADDR;
5313
5314 return inet6_dump_addr(skb, cb, type);
5315 }
5316
5317
inet6_dump_ifacaddr(struct sk_buff * skb,struct netlink_callback * cb)5318 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5319 {
5320 enum addr_type_t type = ANYCAST_ADDR;
5321
5322 return inet6_dump_addr(skb, cb, type);
5323 }
5324
inet6_rtm_valid_getaddr_req(struct sk_buff * skb,const struct nlmsghdr * nlh,struct nlattr ** tb,struct netlink_ext_ack * extack)5325 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5326 const struct nlmsghdr *nlh,
5327 struct nlattr **tb,
5328 struct netlink_ext_ack *extack)
5329 {
5330 struct ifaddrmsg *ifm;
5331 int i, err;
5332
5333 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5334 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5335 return -EINVAL;
5336 }
5337
5338 if (!netlink_strict_get_check(skb))
5339 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5340 ifa_ipv6_policy, extack);
5341
5342 ifm = nlmsg_data(nlh);
5343 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5344 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5345 return -EINVAL;
5346 }
5347
5348 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5349 ifa_ipv6_policy, extack);
5350 if (err)
5351 return err;
5352
5353 for (i = 0; i <= IFA_MAX; i++) {
5354 if (!tb[i])
5355 continue;
5356
5357 switch (i) {
5358 case IFA_TARGET_NETNSID:
5359 case IFA_ADDRESS:
5360 case IFA_LOCAL:
5361 break;
5362 default:
5363 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5364 return -EINVAL;
5365 }
5366 }
5367
5368 return 0;
5369 }
5370
inet6_rtm_getaddr(struct sk_buff * in_skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5371 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5372 struct netlink_ext_ack *extack)
5373 {
5374 struct net *net = sock_net(in_skb->sk);
5375 struct inet6_fill_args fillargs = {
5376 .portid = NETLINK_CB(in_skb).portid,
5377 .seq = nlh->nlmsg_seq,
5378 .event = RTM_NEWADDR,
5379 .flags = 0,
5380 .netnsid = -1,
5381 };
5382 struct net *tgt_net = net;
5383 struct ifaddrmsg *ifm;
5384 struct nlattr *tb[IFA_MAX+1];
5385 struct in6_addr *addr = NULL, *peer;
5386 struct net_device *dev = NULL;
5387 struct inet6_ifaddr *ifa;
5388 struct sk_buff *skb;
5389 int err;
5390
5391 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5392 if (err < 0)
5393 return err;
5394
5395 if (tb[IFA_TARGET_NETNSID]) {
5396 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5397
5398 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5399 fillargs.netnsid);
5400 if (IS_ERR(tgt_net))
5401 return PTR_ERR(tgt_net);
5402 }
5403
5404 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5405 if (!addr) {
5406 err = -EINVAL;
5407 goto errout;
5408 }
5409 ifm = nlmsg_data(nlh);
5410 if (ifm->ifa_index)
5411 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5412
5413 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5414 if (!ifa) {
5415 err = -EADDRNOTAVAIL;
5416 goto errout;
5417 }
5418
5419 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5420 if (!skb) {
5421 err = -ENOBUFS;
5422 goto errout_ifa;
5423 }
5424
5425 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5426 if (err < 0) {
5427 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5428 WARN_ON(err == -EMSGSIZE);
5429 kfree_skb(skb);
5430 goto errout_ifa;
5431 }
5432 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5433 errout_ifa:
5434 in6_ifa_put(ifa);
5435 errout:
5436 if (dev)
5437 dev_put(dev);
5438 if (fillargs.netnsid >= 0)
5439 put_net(tgt_net);
5440
5441 return err;
5442 }
5443
inet6_ifa_notify(int event,struct inet6_ifaddr * ifa)5444 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5445 {
5446 struct sk_buff *skb;
5447 struct net *net = dev_net(ifa->idev->dev);
5448 struct inet6_fill_args fillargs = {
5449 .portid = 0,
5450 .seq = 0,
5451 .event = event,
5452 .flags = 0,
5453 .netnsid = -1,
5454 };
5455 int err = -ENOBUFS;
5456
5457 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5458 if (!skb)
5459 goto errout;
5460
5461 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5462 if (err < 0) {
5463 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5464 WARN_ON(err == -EMSGSIZE);
5465 kfree_skb(skb);
5466 goto errout;
5467 }
5468 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5469 return;
5470 errout:
5471 if (err < 0)
5472 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5473 }
5474
ipv6_store_devconf(struct ipv6_devconf * cnf,__s32 * array,int bytes)5475 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5476 __s32 *array, int bytes)
5477 {
5478 BUG_ON(bytes < (DEVCONF_MAX * 4));
5479
5480 memset(array, 0, bytes);
5481 array[DEVCONF_FORWARDING] = cnf->forwarding;
5482 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5483 array[DEVCONF_MTU6] = cnf->mtu6;
5484 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5485 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5486 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5487 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5488 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5489 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5490 jiffies_to_msecs(cnf->rtr_solicit_interval);
5491 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5492 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5493 array[DEVCONF_RTR_SOLICIT_DELAY] =
5494 jiffies_to_msecs(cnf->rtr_solicit_delay);
5495 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5496 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5497 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5498 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5499 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5500 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5501 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5502 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5503 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5504 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5505 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5506 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5507 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5508 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5509 #ifdef CONFIG_IPV6_ROUTER_PREF
5510 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5511 array[DEVCONF_RTR_PROBE_INTERVAL] =
5512 jiffies_to_msecs(cnf->rtr_probe_interval);
5513 #ifdef CONFIG_IPV6_ROUTE_INFO
5514 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5515 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5516 #endif
5517 #endif
5518 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5519 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5520 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5521 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5522 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5523 #endif
5524 #ifdef CONFIG_IPV6_MROUTE
5525 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5526 #endif
5527 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5528 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5529 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5530 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5531 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5532 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5533 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5534 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5535 /* we omit DEVCONF_STABLE_SECRET for now */
5536 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5537 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5538 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5539 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5540 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5541 #ifdef CONFIG_IPV6_SEG6_HMAC
5542 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5543 #endif
5544 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5545 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5546 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5547 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5548 }
5549
inet6_ifla6_size(void)5550 static inline size_t inet6_ifla6_size(void)
5551 {
5552 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5553 + nla_total_size(sizeof(struct ifla_cacheinfo))
5554 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5555 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5556 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5557 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5558 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5559 + 0;
5560 }
5561
inet6_if_nlmsg_size(void)5562 static inline size_t inet6_if_nlmsg_size(void)
5563 {
5564 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5565 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5566 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5567 + nla_total_size(4) /* IFLA_MTU */
5568 + nla_total_size(4) /* IFLA_LINK */
5569 + nla_total_size(1) /* IFLA_OPERSTATE */
5570 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5571 }
5572
__snmp6_fill_statsdev(u64 * stats,atomic_long_t * mib,int bytes)5573 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5574 int bytes)
5575 {
5576 int i;
5577 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5578 BUG_ON(pad < 0);
5579
5580 /* Use put_unaligned() because stats may not be aligned for u64. */
5581 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5582 for (i = 1; i < ICMP6_MIB_MAX; i++)
5583 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5584
5585 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5586 }
5587
__snmp6_fill_stats64(u64 * stats,void __percpu * mib,int bytes,size_t syncpoff)5588 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5589 int bytes, size_t syncpoff)
5590 {
5591 int i, c;
5592 u64 buff[IPSTATS_MIB_MAX];
5593 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5594
5595 BUG_ON(pad < 0);
5596
5597 memset(buff, 0, sizeof(buff));
5598 buff[0] = IPSTATS_MIB_MAX;
5599
5600 for_each_possible_cpu(c) {
5601 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5602 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5603 }
5604
5605 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5606 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5607 }
5608
snmp6_fill_stats(u64 * stats,struct inet6_dev * idev,int attrtype,int bytes)5609 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5610 int bytes)
5611 {
5612 switch (attrtype) {
5613 case IFLA_INET6_STATS:
5614 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5615 offsetof(struct ipstats_mib, syncp));
5616 break;
5617 case IFLA_INET6_ICMP6STATS:
5618 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5619 break;
5620 }
5621 }
5622
inet6_fill_ifla6_attrs(struct sk_buff * skb,struct inet6_dev * idev,u32 ext_filter_mask)5623 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5624 u32 ext_filter_mask)
5625 {
5626 struct nlattr *nla;
5627 struct ifla_cacheinfo ci;
5628
5629 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5630 goto nla_put_failure;
5631 ci.max_reasm_len = IPV6_MAXPLEN;
5632 ci.tstamp = cstamp_delta(idev->tstamp);
5633 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5634 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5635 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5636 goto nla_put_failure;
5637 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5638 if (!nla)
5639 goto nla_put_failure;
5640 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5641
5642 /* XXX - MC not implemented */
5643
5644 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5645 return 0;
5646
5647 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5648 if (!nla)
5649 goto nla_put_failure;
5650 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5651
5652 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5653 if (!nla)
5654 goto nla_put_failure;
5655 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5656
5657 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5658 if (!nla)
5659 goto nla_put_failure;
5660
5661 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5662 goto nla_put_failure;
5663
5664 read_lock_bh(&idev->lock);
5665 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5666 read_unlock_bh(&idev->lock);
5667
5668 return 0;
5669
5670 nla_put_failure:
5671 return -EMSGSIZE;
5672 }
5673
inet6_get_link_af_size(const struct net_device * dev,u32 ext_filter_mask)5674 static size_t inet6_get_link_af_size(const struct net_device *dev,
5675 u32 ext_filter_mask)
5676 {
5677 if (!__in6_dev_get(dev))
5678 return 0;
5679
5680 return inet6_ifla6_size();
5681 }
5682
inet6_fill_link_af(struct sk_buff * skb,const struct net_device * dev,u32 ext_filter_mask)5683 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5684 u32 ext_filter_mask)
5685 {
5686 struct inet6_dev *idev = __in6_dev_get(dev);
5687
5688 if (!idev)
5689 return -ENODATA;
5690
5691 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5692 return -EMSGSIZE;
5693
5694 return 0;
5695 }
5696
inet6_set_iftoken(struct inet6_dev * idev,struct in6_addr * token)5697 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5698 {
5699 struct inet6_ifaddr *ifp;
5700 struct net_device *dev = idev->dev;
5701 bool clear_token, update_rs = false;
5702 struct in6_addr ll_addr;
5703
5704 ASSERT_RTNL();
5705
5706 if (!token)
5707 return -EINVAL;
5708 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5709 return -EINVAL;
5710 if (!ipv6_accept_ra(idev))
5711 return -EINVAL;
5712 if (idev->cnf.rtr_solicits == 0)
5713 return -EINVAL;
5714
5715 write_lock_bh(&idev->lock);
5716
5717 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5718 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5719
5720 write_unlock_bh(&idev->lock);
5721
5722 clear_token = ipv6_addr_any(token);
5723 if (clear_token)
5724 goto update_lft;
5725
5726 if (!idev->dead && (idev->if_flags & IF_READY) &&
5727 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5728 IFA_F_OPTIMISTIC)) {
5729 /* If we're not ready, then normal ifup will take care
5730 * of this. Otherwise, we need to request our rs here.
5731 */
5732 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5733 update_rs = true;
5734 }
5735
5736 update_lft:
5737 write_lock_bh(&idev->lock);
5738
5739 if (update_rs) {
5740 idev->if_flags |= IF_RS_SENT;
5741 idev->rs_interval = rfc3315_s14_backoff_init(
5742 idev->cnf.rtr_solicit_interval);
5743 idev->rs_probes = 1;
5744 addrconf_mod_rs_timer(idev, idev->rs_interval);
5745 }
5746
5747 /* Well, that's kinda nasty ... */
5748 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5749 spin_lock(&ifp->lock);
5750 if (ifp->tokenized) {
5751 ifp->valid_lft = 0;
5752 ifp->prefered_lft = 0;
5753 }
5754 spin_unlock(&ifp->lock);
5755 }
5756
5757 write_unlock_bh(&idev->lock);
5758 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5759 addrconf_verify_rtnl();
5760 return 0;
5761 }
5762
5763 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5764 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5765 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5766 };
5767
check_addr_gen_mode(int mode)5768 static int check_addr_gen_mode(int mode)
5769 {
5770 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5771 mode != IN6_ADDR_GEN_MODE_NONE &&
5772 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5773 mode != IN6_ADDR_GEN_MODE_RANDOM)
5774 return -EINVAL;
5775 return 1;
5776 }
5777
check_stable_privacy(struct inet6_dev * idev,struct net * net,int mode)5778 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5779 int mode)
5780 {
5781 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5782 !idev->cnf.stable_secret.initialized &&
5783 !net->ipv6.devconf_dflt->stable_secret.initialized)
5784 return -EINVAL;
5785 return 1;
5786 }
5787
inet6_validate_link_af(const struct net_device * dev,const struct nlattr * nla)5788 static int inet6_validate_link_af(const struct net_device *dev,
5789 const struct nlattr *nla)
5790 {
5791 struct nlattr *tb[IFLA_INET6_MAX + 1];
5792 struct inet6_dev *idev = NULL;
5793 int err;
5794
5795 if (dev) {
5796 idev = __in6_dev_get(dev);
5797 if (!idev)
5798 return -EAFNOSUPPORT;
5799 }
5800
5801 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5802 inet6_af_policy, NULL);
5803 if (err)
5804 return err;
5805
5806 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5807 return -EINVAL;
5808
5809 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5810 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5811
5812 if (check_addr_gen_mode(mode) < 0)
5813 return -EINVAL;
5814 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5815 return -EINVAL;
5816 }
5817
5818 return 0;
5819 }
5820
inet6_set_link_af(struct net_device * dev,const struct nlattr * nla)5821 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5822 {
5823 struct inet6_dev *idev = __in6_dev_get(dev);
5824 struct nlattr *tb[IFLA_INET6_MAX + 1];
5825 int err;
5826
5827 if (!idev)
5828 return -EAFNOSUPPORT;
5829
5830 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5831 return -EINVAL;
5832
5833 if (tb[IFLA_INET6_TOKEN]) {
5834 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5835 if (err)
5836 return err;
5837 }
5838
5839 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5840 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5841
5842 idev->cnf.addr_gen_mode = mode;
5843 }
5844
5845 return 0;
5846 }
5847
inet6_fill_ifinfo(struct sk_buff * skb,struct inet6_dev * idev,u32 portid,u32 seq,int event,unsigned int flags)5848 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5849 u32 portid, u32 seq, int event, unsigned int flags)
5850 {
5851 struct net_device *dev = idev->dev;
5852 struct ifinfomsg *hdr;
5853 struct nlmsghdr *nlh;
5854 void *protoinfo;
5855
5856 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5857 if (!nlh)
5858 return -EMSGSIZE;
5859
5860 hdr = nlmsg_data(nlh);
5861 hdr->ifi_family = AF_INET6;
5862 hdr->__ifi_pad = 0;
5863 hdr->ifi_type = dev->type;
5864 hdr->ifi_index = dev->ifindex;
5865 hdr->ifi_flags = dev_get_flags(dev);
5866 hdr->ifi_change = 0;
5867
5868 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5869 (dev->addr_len &&
5870 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5871 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5872 (dev->ifindex != dev_get_iflink(dev) &&
5873 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5874 nla_put_u8(skb, IFLA_OPERSTATE,
5875 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5876 goto nla_put_failure;
5877 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5878 if (!protoinfo)
5879 goto nla_put_failure;
5880
5881 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5882 goto nla_put_failure;
5883
5884 nla_nest_end(skb, protoinfo);
5885 nlmsg_end(skb, nlh);
5886 return 0;
5887
5888 nla_put_failure:
5889 nlmsg_cancel(skb, nlh);
5890 return -EMSGSIZE;
5891 }
5892
inet6_valid_dump_ifinfo(const struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5893 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5894 struct netlink_ext_ack *extack)
5895 {
5896 struct ifinfomsg *ifm;
5897
5898 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5899 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5900 return -EINVAL;
5901 }
5902
5903 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5904 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5905 return -EINVAL;
5906 }
5907
5908 ifm = nlmsg_data(nlh);
5909 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5910 ifm->ifi_change || ifm->ifi_index) {
5911 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5912 return -EINVAL;
5913 }
5914
5915 return 0;
5916 }
5917
inet6_dump_ifinfo(struct sk_buff * skb,struct netlink_callback * cb)5918 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5919 {
5920 struct net *net = sock_net(skb->sk);
5921 int h, s_h;
5922 int idx = 0, s_idx;
5923 struct net_device *dev;
5924 struct inet6_dev *idev;
5925 struct hlist_head *head;
5926
5927 /* only requests using strict checking can pass data to
5928 * influence the dump
5929 */
5930 if (cb->strict_check) {
5931 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5932
5933 if (err < 0)
5934 return err;
5935 }
5936
5937 s_h = cb->args[0];
5938 s_idx = cb->args[1];
5939
5940 rcu_read_lock();
5941 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5942 idx = 0;
5943 head = &net->dev_index_head[h];
5944 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5945 if (idx < s_idx)
5946 goto cont;
5947 idev = __in6_dev_get(dev);
5948 if (!idev)
5949 goto cont;
5950 if (inet6_fill_ifinfo(skb, idev,
5951 NETLINK_CB(cb->skb).portid,
5952 cb->nlh->nlmsg_seq,
5953 RTM_NEWLINK, NLM_F_MULTI) < 0)
5954 goto out;
5955 cont:
5956 idx++;
5957 }
5958 }
5959 out:
5960 rcu_read_unlock();
5961 cb->args[1] = idx;
5962 cb->args[0] = h;
5963
5964 return skb->len;
5965 }
5966
inet6_ifinfo_notify(int event,struct inet6_dev * idev)5967 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5968 {
5969 struct sk_buff *skb;
5970 struct net *net = dev_net(idev->dev);
5971 int err = -ENOBUFS;
5972
5973 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5974 if (!skb)
5975 goto errout;
5976
5977 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5978 if (err < 0) {
5979 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5980 WARN_ON(err == -EMSGSIZE);
5981 kfree_skb(skb);
5982 goto errout;
5983 }
5984 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5985 return;
5986 errout:
5987 if (err < 0)
5988 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5989 }
5990
inet6_prefix_nlmsg_size(void)5991 static inline size_t inet6_prefix_nlmsg_size(void)
5992 {
5993 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5994 + nla_total_size(sizeof(struct in6_addr))
5995 + nla_total_size(sizeof(struct prefix_cacheinfo));
5996 }
5997
inet6_fill_prefix(struct sk_buff * skb,struct inet6_dev * idev,struct prefix_info * pinfo,u32 portid,u32 seq,int event,unsigned int flags)5998 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5999 struct prefix_info *pinfo, u32 portid, u32 seq,
6000 int event, unsigned int flags)
6001 {
6002 struct prefixmsg *pmsg;
6003 struct nlmsghdr *nlh;
6004 struct prefix_cacheinfo ci;
6005
6006 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6007 if (!nlh)
6008 return -EMSGSIZE;
6009
6010 pmsg = nlmsg_data(nlh);
6011 pmsg->prefix_family = AF_INET6;
6012 pmsg->prefix_pad1 = 0;
6013 pmsg->prefix_pad2 = 0;
6014 pmsg->prefix_ifindex = idev->dev->ifindex;
6015 pmsg->prefix_len = pinfo->prefix_len;
6016 pmsg->prefix_type = pinfo->type;
6017 pmsg->prefix_pad3 = 0;
6018 pmsg->prefix_flags = pinfo->flags;
6019
6020 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6021 goto nla_put_failure;
6022 ci.preferred_time = ntohl(pinfo->prefered);
6023 ci.valid_time = ntohl(pinfo->valid);
6024 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6025 goto nla_put_failure;
6026 nlmsg_end(skb, nlh);
6027 return 0;
6028
6029 nla_put_failure:
6030 nlmsg_cancel(skb, nlh);
6031 return -EMSGSIZE;
6032 }
6033
inet6_prefix_notify(int event,struct inet6_dev * idev,struct prefix_info * pinfo)6034 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6035 struct prefix_info *pinfo)
6036 {
6037 struct sk_buff *skb;
6038 struct net *net = dev_net(idev->dev);
6039 int err = -ENOBUFS;
6040
6041 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6042 if (!skb)
6043 goto errout;
6044
6045 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6046 if (err < 0) {
6047 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6048 WARN_ON(err == -EMSGSIZE);
6049 kfree_skb(skb);
6050 goto errout;
6051 }
6052 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6053 return;
6054 errout:
6055 if (err < 0)
6056 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6057 }
6058
__ipv6_ifa_notify(int event,struct inet6_ifaddr * ifp)6059 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6060 {
6061 struct net *net = dev_net(ifp->idev->dev);
6062
6063 if (event)
6064 ASSERT_RTNL();
6065
6066 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6067
6068 switch (event) {
6069 case RTM_NEWADDR:
6070 /*
6071 * If the address was optimistic we inserted the route at the
6072 * start of our DAD process, so we don't need to do it again.
6073 * If the device was taken down in the middle of the DAD
6074 * cycle there is a race where we could get here without a
6075 * host route, so nothing to insert. That will be fixed when
6076 * the device is brought up.
6077 */
6078 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6079 ip6_ins_rt(net, ifp->rt);
6080 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6081 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6082 &ifp->addr, ifp->idev->dev->name);
6083 }
6084
6085 if (ifp->idev->cnf.forwarding)
6086 addrconf_join_anycast(ifp);
6087 if (!ipv6_addr_any(&ifp->peer_addr))
6088 addrconf_prefix_route(&ifp->peer_addr, 128,
6089 ifp->rt_priority, ifp->idev->dev,
6090 0, 0, GFP_ATOMIC);
6091 break;
6092 case RTM_DELADDR:
6093 if (ifp->idev->cnf.forwarding)
6094 addrconf_leave_anycast(ifp);
6095 addrconf_leave_solict(ifp->idev, &ifp->addr);
6096 if (!ipv6_addr_any(&ifp->peer_addr)) {
6097 struct fib6_info *rt;
6098
6099 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6100 ifp->idev->dev, 0, 0,
6101 false);
6102 if (rt)
6103 ip6_del_rt(net, rt);
6104 }
6105 if (ifp->rt) {
6106 ip6_del_rt(net, ifp->rt);
6107 ifp->rt = NULL;
6108 }
6109 rt_genid_bump_ipv6(net);
6110 break;
6111 }
6112 atomic_inc(&net->ipv6.dev_addr_genid);
6113 }
6114
ipv6_ifa_notify(int event,struct inet6_ifaddr * ifp)6115 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6116 {
6117 rcu_read_lock_bh();
6118 if (likely(ifp->idev->dead == 0))
6119 __ipv6_ifa_notify(event, ifp);
6120 rcu_read_unlock_bh();
6121 }
6122
6123 #ifdef CONFIG_SYSCTL
6124
6125 static
addrconf_sysctl_forward(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6126 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6127 void __user *buffer, size_t *lenp, loff_t *ppos)
6128 {
6129 int *valp = ctl->data;
6130 int val = *valp;
6131 loff_t pos = *ppos;
6132 struct ctl_table lctl;
6133 int ret;
6134
6135 /*
6136 * ctl->data points to idev->cnf.forwarding, we should
6137 * not modify it until we get the rtnl lock.
6138 */
6139 lctl = *ctl;
6140 lctl.data = &val;
6141
6142 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6143
6144 if (write)
6145 ret = addrconf_fixup_forwarding(ctl, valp, val);
6146 if (ret)
6147 *ppos = pos;
6148 return ret;
6149 }
6150
6151 static
addrconf_sysctl_mtu(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6152 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6153 void __user *buffer, size_t *lenp, loff_t *ppos)
6154 {
6155 struct inet6_dev *idev = ctl->extra1;
6156 int min_mtu = IPV6_MIN_MTU;
6157 struct ctl_table lctl;
6158
6159 lctl = *ctl;
6160 lctl.extra1 = &min_mtu;
6161 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6162
6163 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6164 }
6165
dev_disable_change(struct inet6_dev * idev)6166 static void dev_disable_change(struct inet6_dev *idev)
6167 {
6168 struct netdev_notifier_info info;
6169
6170 if (!idev || !idev->dev)
6171 return;
6172
6173 netdev_notifier_info_init(&info, idev->dev);
6174 if (idev->cnf.disable_ipv6)
6175 addrconf_notify(NULL, NETDEV_DOWN, &info);
6176 else
6177 addrconf_notify(NULL, NETDEV_UP, &info);
6178 }
6179
addrconf_disable_change(struct net * net,__s32 newf)6180 static void addrconf_disable_change(struct net *net, __s32 newf)
6181 {
6182 struct net_device *dev;
6183 struct inet6_dev *idev;
6184
6185 for_each_netdev(net, dev) {
6186 idev = __in6_dev_get(dev);
6187 if (idev) {
6188 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6189 idev->cnf.disable_ipv6 = newf;
6190 if (changed)
6191 dev_disable_change(idev);
6192 }
6193 }
6194 }
6195
addrconf_disable_ipv6(struct ctl_table * table,int * p,int newf)6196 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6197 {
6198 struct net *net;
6199 int old;
6200
6201 if (!rtnl_trylock())
6202 return restart_syscall();
6203
6204 net = (struct net *)table->extra2;
6205 old = *p;
6206 *p = newf;
6207
6208 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6209 rtnl_unlock();
6210 return 0;
6211 }
6212
6213 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6214 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6215 addrconf_disable_change(net, newf);
6216 } else if ((!newf) ^ (!old))
6217 dev_disable_change((struct inet6_dev *)table->extra1);
6218
6219 rtnl_unlock();
6220 return 0;
6221 }
6222
6223 static
addrconf_sysctl_disable(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6224 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6225 void __user *buffer, size_t *lenp, loff_t *ppos)
6226 {
6227 int *valp = ctl->data;
6228 int val = *valp;
6229 loff_t pos = *ppos;
6230 struct ctl_table lctl;
6231 int ret;
6232
6233 /*
6234 * ctl->data points to idev->cnf.disable_ipv6, we should
6235 * not modify it until we get the rtnl lock.
6236 */
6237 lctl = *ctl;
6238 lctl.data = &val;
6239
6240 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6241
6242 if (write)
6243 ret = addrconf_disable_ipv6(ctl, valp, val);
6244 if (ret)
6245 *ppos = pos;
6246 return ret;
6247 }
6248
6249 static
addrconf_sysctl_proxy_ndp(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6250 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6251 void __user *buffer, size_t *lenp, loff_t *ppos)
6252 {
6253 int *valp = ctl->data;
6254 int ret;
6255 int old, new;
6256
6257 old = *valp;
6258 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6259 new = *valp;
6260
6261 if (write && old != new) {
6262 struct net *net = ctl->extra2;
6263
6264 if (!rtnl_trylock())
6265 return restart_syscall();
6266
6267 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6268 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6269 NETCONFA_PROXY_NEIGH,
6270 NETCONFA_IFINDEX_DEFAULT,
6271 net->ipv6.devconf_dflt);
6272 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6273 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6274 NETCONFA_PROXY_NEIGH,
6275 NETCONFA_IFINDEX_ALL,
6276 net->ipv6.devconf_all);
6277 else {
6278 struct inet6_dev *idev = ctl->extra1;
6279
6280 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6281 NETCONFA_PROXY_NEIGH,
6282 idev->dev->ifindex,
6283 &idev->cnf);
6284 }
6285 rtnl_unlock();
6286 }
6287
6288 return ret;
6289 }
6290
addrconf_sysctl_addr_gen_mode(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6291 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6292 void __user *buffer, size_t *lenp,
6293 loff_t *ppos)
6294 {
6295 int ret = 0;
6296 u32 new_val;
6297 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6298 struct net *net = (struct net *)ctl->extra2;
6299 struct ctl_table tmp = {
6300 .data = &new_val,
6301 .maxlen = sizeof(new_val),
6302 .mode = ctl->mode,
6303 };
6304
6305 if (!rtnl_trylock())
6306 return restart_syscall();
6307
6308 new_val = *((u32 *)ctl->data);
6309
6310 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6311 if (ret != 0)
6312 goto out;
6313
6314 if (write) {
6315 if (check_addr_gen_mode(new_val) < 0) {
6316 ret = -EINVAL;
6317 goto out;
6318 }
6319
6320 if (idev) {
6321 if (check_stable_privacy(idev, net, new_val) < 0) {
6322 ret = -EINVAL;
6323 goto out;
6324 }
6325
6326 if (idev->cnf.addr_gen_mode != new_val) {
6327 idev->cnf.addr_gen_mode = new_val;
6328 addrconf_dev_config(idev->dev);
6329 }
6330 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6331 struct net_device *dev;
6332
6333 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6334 for_each_netdev(net, dev) {
6335 idev = __in6_dev_get(dev);
6336 if (idev &&
6337 idev->cnf.addr_gen_mode != new_val) {
6338 idev->cnf.addr_gen_mode = new_val;
6339 addrconf_dev_config(idev->dev);
6340 }
6341 }
6342 }
6343
6344 *((u32 *)ctl->data) = new_val;
6345 }
6346
6347 out:
6348 rtnl_unlock();
6349
6350 return ret;
6351 }
6352
addrconf_sysctl_stable_secret(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6353 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6354 void __user *buffer, size_t *lenp,
6355 loff_t *ppos)
6356 {
6357 int err;
6358 struct in6_addr addr;
6359 char str[IPV6_MAX_STRLEN];
6360 struct ctl_table lctl = *ctl;
6361 struct net *net = ctl->extra2;
6362 struct ipv6_stable_secret *secret = ctl->data;
6363
6364 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6365 return -EIO;
6366
6367 lctl.maxlen = IPV6_MAX_STRLEN;
6368 lctl.data = str;
6369
6370 if (!rtnl_trylock())
6371 return restart_syscall();
6372
6373 if (!write && !secret->initialized) {
6374 err = -EIO;
6375 goto out;
6376 }
6377
6378 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6379 if (err >= sizeof(str)) {
6380 err = -EIO;
6381 goto out;
6382 }
6383
6384 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6385 if (err || !write)
6386 goto out;
6387
6388 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6389 err = -EIO;
6390 goto out;
6391 }
6392
6393 secret->initialized = true;
6394 secret->secret = addr;
6395
6396 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6397 struct net_device *dev;
6398
6399 for_each_netdev(net, dev) {
6400 struct inet6_dev *idev = __in6_dev_get(dev);
6401
6402 if (idev) {
6403 idev->cnf.addr_gen_mode =
6404 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6405 }
6406 }
6407 } else {
6408 struct inet6_dev *idev = ctl->extra1;
6409
6410 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6411 }
6412
6413 out:
6414 rtnl_unlock();
6415
6416 return err;
6417 }
6418
6419 static
addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6420 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6421 int write,
6422 void __user *buffer,
6423 size_t *lenp,
6424 loff_t *ppos)
6425 {
6426 int *valp = ctl->data;
6427 int val = *valp;
6428 loff_t pos = *ppos;
6429 struct ctl_table lctl;
6430 int ret;
6431
6432 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6433 * we should not modify it until we get the rtnl lock.
6434 */
6435 lctl = *ctl;
6436 lctl.data = &val;
6437
6438 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6439
6440 if (write)
6441 ret = addrconf_fixup_linkdown(ctl, valp, val);
6442 if (ret)
6443 *ppos = pos;
6444 return ret;
6445 }
6446
6447 static
addrconf_set_nopolicy(struct rt6_info * rt,int action)6448 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6449 {
6450 if (rt) {
6451 if (action)
6452 rt->dst.flags |= DST_NOPOLICY;
6453 else
6454 rt->dst.flags &= ~DST_NOPOLICY;
6455 }
6456 }
6457
6458 static
addrconf_disable_policy_idev(struct inet6_dev * idev,int val)6459 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6460 {
6461 struct inet6_ifaddr *ifa;
6462
6463 read_lock_bh(&idev->lock);
6464 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6465 spin_lock(&ifa->lock);
6466 if (ifa->rt) {
6467 /* host routes only use builtin fib6_nh */
6468 struct fib6_nh *nh = ifa->rt->fib6_nh;
6469 int cpu;
6470
6471 rcu_read_lock();
6472 ifa->rt->dst_nopolicy = val ? true : false;
6473 if (nh->rt6i_pcpu) {
6474 for_each_possible_cpu(cpu) {
6475 struct rt6_info **rtp;
6476
6477 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6478 addrconf_set_nopolicy(*rtp, val);
6479 }
6480 }
6481 rcu_read_unlock();
6482 }
6483 spin_unlock(&ifa->lock);
6484 }
6485 read_unlock_bh(&idev->lock);
6486 }
6487
6488 static
addrconf_disable_policy(struct ctl_table * ctl,int * valp,int val)6489 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6490 {
6491 struct inet6_dev *idev;
6492 struct net *net;
6493
6494 if (!rtnl_trylock())
6495 return restart_syscall();
6496
6497 *valp = val;
6498
6499 net = (struct net *)ctl->extra2;
6500 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6501 rtnl_unlock();
6502 return 0;
6503 }
6504
6505 if (valp == &net->ipv6.devconf_all->disable_policy) {
6506 struct net_device *dev;
6507
6508 for_each_netdev(net, dev) {
6509 idev = __in6_dev_get(dev);
6510 if (idev)
6511 addrconf_disable_policy_idev(idev, val);
6512 }
6513 } else {
6514 idev = (struct inet6_dev *)ctl->extra1;
6515 addrconf_disable_policy_idev(idev, val);
6516 }
6517
6518 rtnl_unlock();
6519 return 0;
6520 }
6521
6522 static
addrconf_sysctl_disable_policy(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)6523 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6524 void __user *buffer, size_t *lenp,
6525 loff_t *ppos)
6526 {
6527 int *valp = ctl->data;
6528 int val = *valp;
6529 loff_t pos = *ppos;
6530 struct ctl_table lctl;
6531 int ret;
6532
6533 lctl = *ctl;
6534 lctl.data = &val;
6535 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6536
6537 if (write && (*valp != val))
6538 ret = addrconf_disable_policy(ctl, valp, val);
6539
6540 if (ret)
6541 *ppos = pos;
6542
6543 return ret;
6544 }
6545
6546 static int minus_one = -1;
6547 static const int two_five_five = 255;
6548
6549 static const struct ctl_table addrconf_sysctl[] = {
6550 {
6551 .procname = "forwarding",
6552 .data = &ipv6_devconf.forwarding,
6553 .maxlen = sizeof(int),
6554 .mode = 0644,
6555 .proc_handler = addrconf_sysctl_forward,
6556 },
6557 {
6558 .procname = "hop_limit",
6559 .data = &ipv6_devconf.hop_limit,
6560 .maxlen = sizeof(int),
6561 .mode = 0644,
6562 .proc_handler = proc_dointvec_minmax,
6563 .extra1 = (void *)SYSCTL_ONE,
6564 .extra2 = (void *)&two_five_five,
6565 },
6566 {
6567 .procname = "mtu",
6568 .data = &ipv6_devconf.mtu6,
6569 .maxlen = sizeof(int),
6570 .mode = 0644,
6571 .proc_handler = addrconf_sysctl_mtu,
6572 },
6573 {
6574 .procname = "accept_ra",
6575 .data = &ipv6_devconf.accept_ra,
6576 .maxlen = sizeof(int),
6577 .mode = 0644,
6578 .proc_handler = proc_dointvec,
6579 },
6580 {
6581 .procname = "accept_redirects",
6582 .data = &ipv6_devconf.accept_redirects,
6583 .maxlen = sizeof(int),
6584 .mode = 0644,
6585 .proc_handler = proc_dointvec,
6586 },
6587 {
6588 .procname = "autoconf",
6589 .data = &ipv6_devconf.autoconf,
6590 .maxlen = sizeof(int),
6591 .mode = 0644,
6592 .proc_handler = proc_dointvec,
6593 },
6594 {
6595 .procname = "dad_transmits",
6596 .data = &ipv6_devconf.dad_transmits,
6597 .maxlen = sizeof(int),
6598 .mode = 0644,
6599 .proc_handler = proc_dointvec,
6600 },
6601 {
6602 .procname = "router_solicitations",
6603 .data = &ipv6_devconf.rtr_solicits,
6604 .maxlen = sizeof(int),
6605 .mode = 0644,
6606 .proc_handler = proc_dointvec_minmax,
6607 .extra1 = &minus_one,
6608 },
6609 {
6610 .procname = "router_solicitation_interval",
6611 .data = &ipv6_devconf.rtr_solicit_interval,
6612 .maxlen = sizeof(int),
6613 .mode = 0644,
6614 .proc_handler = proc_dointvec_jiffies,
6615 },
6616 {
6617 .procname = "router_solicitation_max_interval",
6618 .data = &ipv6_devconf.rtr_solicit_max_interval,
6619 .maxlen = sizeof(int),
6620 .mode = 0644,
6621 .proc_handler = proc_dointvec_jiffies,
6622 },
6623 {
6624 .procname = "router_solicitation_delay",
6625 .data = &ipv6_devconf.rtr_solicit_delay,
6626 .maxlen = sizeof(int),
6627 .mode = 0644,
6628 .proc_handler = proc_dointvec_jiffies,
6629 },
6630 {
6631 .procname = "force_mld_version",
6632 .data = &ipv6_devconf.force_mld_version,
6633 .maxlen = sizeof(int),
6634 .mode = 0644,
6635 .proc_handler = proc_dointvec,
6636 },
6637 {
6638 .procname = "mldv1_unsolicited_report_interval",
6639 .data =
6640 &ipv6_devconf.mldv1_unsolicited_report_interval,
6641 .maxlen = sizeof(int),
6642 .mode = 0644,
6643 .proc_handler = proc_dointvec_ms_jiffies,
6644 },
6645 {
6646 .procname = "mldv2_unsolicited_report_interval",
6647 .data =
6648 &ipv6_devconf.mldv2_unsolicited_report_interval,
6649 .maxlen = sizeof(int),
6650 .mode = 0644,
6651 .proc_handler = proc_dointvec_ms_jiffies,
6652 },
6653 {
6654 .procname = "use_tempaddr",
6655 .data = &ipv6_devconf.use_tempaddr,
6656 .maxlen = sizeof(int),
6657 .mode = 0644,
6658 .proc_handler = proc_dointvec,
6659 },
6660 {
6661 .procname = "temp_valid_lft",
6662 .data = &ipv6_devconf.temp_valid_lft,
6663 .maxlen = sizeof(int),
6664 .mode = 0644,
6665 .proc_handler = proc_dointvec,
6666 },
6667 {
6668 .procname = "temp_prefered_lft",
6669 .data = &ipv6_devconf.temp_prefered_lft,
6670 .maxlen = sizeof(int),
6671 .mode = 0644,
6672 .proc_handler = proc_dointvec,
6673 },
6674 {
6675 .procname = "regen_max_retry",
6676 .data = &ipv6_devconf.regen_max_retry,
6677 .maxlen = sizeof(int),
6678 .mode = 0644,
6679 .proc_handler = proc_dointvec,
6680 },
6681 {
6682 .procname = "max_desync_factor",
6683 .data = &ipv6_devconf.max_desync_factor,
6684 .maxlen = sizeof(int),
6685 .mode = 0644,
6686 .proc_handler = proc_dointvec,
6687 },
6688 {
6689 .procname = "max_addresses",
6690 .data = &ipv6_devconf.max_addresses,
6691 .maxlen = sizeof(int),
6692 .mode = 0644,
6693 .proc_handler = proc_dointvec,
6694 },
6695 {
6696 .procname = "accept_ra_defrtr",
6697 .data = &ipv6_devconf.accept_ra_defrtr,
6698 .maxlen = sizeof(int),
6699 .mode = 0644,
6700 .proc_handler = proc_dointvec,
6701 },
6702 {
6703 .procname = "accept_ra_min_hop_limit",
6704 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6705 .maxlen = sizeof(int),
6706 .mode = 0644,
6707 .proc_handler = proc_dointvec,
6708 },
6709 {
6710 .procname = "accept_ra_pinfo",
6711 .data = &ipv6_devconf.accept_ra_pinfo,
6712 .maxlen = sizeof(int),
6713 .mode = 0644,
6714 .proc_handler = proc_dointvec,
6715 },
6716 #ifdef CONFIG_IPV6_ROUTER_PREF
6717 {
6718 .procname = "accept_ra_rtr_pref",
6719 .data = &ipv6_devconf.accept_ra_rtr_pref,
6720 .maxlen = sizeof(int),
6721 .mode = 0644,
6722 .proc_handler = proc_dointvec,
6723 },
6724 {
6725 .procname = "router_probe_interval",
6726 .data = &ipv6_devconf.rtr_probe_interval,
6727 .maxlen = sizeof(int),
6728 .mode = 0644,
6729 .proc_handler = proc_dointvec_jiffies,
6730 },
6731 #ifdef CONFIG_IPV6_ROUTE_INFO
6732 {
6733 .procname = "accept_ra_rt_info_min_plen",
6734 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6735 .maxlen = sizeof(int),
6736 .mode = 0644,
6737 .proc_handler = proc_dointvec,
6738 },
6739 {
6740 .procname = "accept_ra_rt_info_max_plen",
6741 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6742 .maxlen = sizeof(int),
6743 .mode = 0644,
6744 .proc_handler = proc_dointvec,
6745 },
6746 #endif
6747 #endif
6748 {
6749 .procname = "accept_ra_rt_table",
6750 .data = &ipv6_devconf.accept_ra_rt_table,
6751 .maxlen = sizeof(int),
6752 .mode = 0644,
6753 .proc_handler = proc_dointvec,
6754 },
6755 {
6756 .procname = "proxy_ndp",
6757 .data = &ipv6_devconf.proxy_ndp,
6758 .maxlen = sizeof(int),
6759 .mode = 0644,
6760 .proc_handler = addrconf_sysctl_proxy_ndp,
6761 },
6762 {
6763 .procname = "accept_source_route",
6764 .data = &ipv6_devconf.accept_source_route,
6765 .maxlen = sizeof(int),
6766 .mode = 0644,
6767 .proc_handler = proc_dointvec,
6768 },
6769 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6770 {
6771 .procname = "optimistic_dad",
6772 .data = &ipv6_devconf.optimistic_dad,
6773 .maxlen = sizeof(int),
6774 .mode = 0644,
6775 .proc_handler = proc_dointvec,
6776 },
6777 {
6778 .procname = "use_optimistic",
6779 .data = &ipv6_devconf.use_optimistic,
6780 .maxlen = sizeof(int),
6781 .mode = 0644,
6782 .proc_handler = proc_dointvec,
6783 },
6784 #endif
6785 #ifdef CONFIG_IPV6_MROUTE
6786 {
6787 .procname = "mc_forwarding",
6788 .data = &ipv6_devconf.mc_forwarding,
6789 .maxlen = sizeof(int),
6790 .mode = 0444,
6791 .proc_handler = proc_dointvec,
6792 },
6793 #endif
6794 {
6795 .procname = "disable_ipv6",
6796 .data = &ipv6_devconf.disable_ipv6,
6797 .maxlen = sizeof(int),
6798 .mode = 0644,
6799 .proc_handler = addrconf_sysctl_disable,
6800 },
6801 {
6802 .procname = "accept_dad",
6803 .data = &ipv6_devconf.accept_dad,
6804 .maxlen = sizeof(int),
6805 .mode = 0644,
6806 .proc_handler = proc_dointvec,
6807 },
6808 {
6809 .procname = "force_tllao",
6810 .data = &ipv6_devconf.force_tllao,
6811 .maxlen = sizeof(int),
6812 .mode = 0644,
6813 .proc_handler = proc_dointvec
6814 },
6815 {
6816 .procname = "ndisc_notify",
6817 .data = &ipv6_devconf.ndisc_notify,
6818 .maxlen = sizeof(int),
6819 .mode = 0644,
6820 .proc_handler = proc_dointvec
6821 },
6822 {
6823 .procname = "suppress_frag_ndisc",
6824 .data = &ipv6_devconf.suppress_frag_ndisc,
6825 .maxlen = sizeof(int),
6826 .mode = 0644,
6827 .proc_handler = proc_dointvec
6828 },
6829 {
6830 .procname = "accept_ra_from_local",
6831 .data = &ipv6_devconf.accept_ra_from_local,
6832 .maxlen = sizeof(int),
6833 .mode = 0644,
6834 .proc_handler = proc_dointvec,
6835 },
6836 {
6837 .procname = "accept_ra_mtu",
6838 .data = &ipv6_devconf.accept_ra_mtu,
6839 .maxlen = sizeof(int),
6840 .mode = 0644,
6841 .proc_handler = proc_dointvec,
6842 },
6843 {
6844 .procname = "stable_secret",
6845 .data = &ipv6_devconf.stable_secret,
6846 .maxlen = IPV6_MAX_STRLEN,
6847 .mode = 0600,
6848 .proc_handler = addrconf_sysctl_stable_secret,
6849 },
6850 {
6851 .procname = "use_oif_addrs_only",
6852 .data = &ipv6_devconf.use_oif_addrs_only,
6853 .maxlen = sizeof(int),
6854 .mode = 0644,
6855 .proc_handler = proc_dointvec,
6856 },
6857 {
6858 .procname = "ignore_routes_with_linkdown",
6859 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6860 .maxlen = sizeof(int),
6861 .mode = 0644,
6862 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6863 },
6864 {
6865 .procname = "drop_unicast_in_l2_multicast",
6866 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6867 .maxlen = sizeof(int),
6868 .mode = 0644,
6869 .proc_handler = proc_dointvec,
6870 },
6871 {
6872 .procname = "drop_unsolicited_na",
6873 .data = &ipv6_devconf.drop_unsolicited_na,
6874 .maxlen = sizeof(int),
6875 .mode = 0644,
6876 .proc_handler = proc_dointvec,
6877 },
6878 {
6879 .procname = "keep_addr_on_down",
6880 .data = &ipv6_devconf.keep_addr_on_down,
6881 .maxlen = sizeof(int),
6882 .mode = 0644,
6883 .proc_handler = proc_dointvec,
6884
6885 },
6886 {
6887 .procname = "seg6_enabled",
6888 .data = &ipv6_devconf.seg6_enabled,
6889 .maxlen = sizeof(int),
6890 .mode = 0644,
6891 .proc_handler = proc_dointvec,
6892 },
6893 #ifdef CONFIG_IPV6_SEG6_HMAC
6894 {
6895 .procname = "seg6_require_hmac",
6896 .data = &ipv6_devconf.seg6_require_hmac,
6897 .maxlen = sizeof(int),
6898 .mode = 0644,
6899 .proc_handler = proc_dointvec,
6900 },
6901 #endif
6902 {
6903 .procname = "enhanced_dad",
6904 .data = &ipv6_devconf.enhanced_dad,
6905 .maxlen = sizeof(int),
6906 .mode = 0644,
6907 .proc_handler = proc_dointvec,
6908 },
6909 {
6910 .procname = "addr_gen_mode",
6911 .data = &ipv6_devconf.addr_gen_mode,
6912 .maxlen = sizeof(int),
6913 .mode = 0644,
6914 .proc_handler = addrconf_sysctl_addr_gen_mode,
6915 },
6916 {
6917 .procname = "disable_policy",
6918 .data = &ipv6_devconf.disable_policy,
6919 .maxlen = sizeof(int),
6920 .mode = 0644,
6921 .proc_handler = addrconf_sysctl_disable_policy,
6922 },
6923 {
6924 .procname = "ndisc_tclass",
6925 .data = &ipv6_devconf.ndisc_tclass,
6926 .maxlen = sizeof(int),
6927 .mode = 0644,
6928 .proc_handler = proc_dointvec_minmax,
6929 .extra1 = (void *)SYSCTL_ZERO,
6930 .extra2 = (void *)&two_five_five,
6931 },
6932 {
6933 /* sentinel */
6934 }
6935 };
6936
__addrconf_sysctl_register(struct net * net,char * dev_name,struct inet6_dev * idev,struct ipv6_devconf * p)6937 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6938 struct inet6_dev *idev, struct ipv6_devconf *p)
6939 {
6940 int i, ifindex;
6941 struct ctl_table *table;
6942 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6943
6944 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6945 if (!table)
6946 goto out;
6947
6948 for (i = 0; table[i].data; i++) {
6949 table[i].data += (char *)p - (char *)&ipv6_devconf;
6950 /* If one of these is already set, then it is not safe to
6951 * overwrite either of them: this makes proc_dointvec_minmax
6952 * usable.
6953 */
6954 if (!table[i].extra1 && !table[i].extra2) {
6955 table[i].extra1 = idev; /* embedded; no ref */
6956 table[i].extra2 = net;
6957 }
6958 }
6959
6960 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6961
6962 p->sysctl_header = register_net_sysctl(net, path, table);
6963 if (!p->sysctl_header)
6964 goto free;
6965
6966 if (!strcmp(dev_name, "all"))
6967 ifindex = NETCONFA_IFINDEX_ALL;
6968 else if (!strcmp(dev_name, "default"))
6969 ifindex = NETCONFA_IFINDEX_DEFAULT;
6970 else
6971 ifindex = idev->dev->ifindex;
6972 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6973 ifindex, p);
6974 return 0;
6975
6976 free:
6977 kfree(table);
6978 out:
6979 return -ENOBUFS;
6980 }
6981
__addrconf_sysctl_unregister(struct net * net,struct ipv6_devconf * p,int ifindex)6982 static void __addrconf_sysctl_unregister(struct net *net,
6983 struct ipv6_devconf *p, int ifindex)
6984 {
6985 struct ctl_table *table;
6986
6987 if (!p->sysctl_header)
6988 return;
6989
6990 table = p->sysctl_header->ctl_table_arg;
6991 unregister_net_sysctl_table(p->sysctl_header);
6992 p->sysctl_header = NULL;
6993 kfree(table);
6994
6995 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6996 }
6997
addrconf_sysctl_register(struct inet6_dev * idev)6998 static int addrconf_sysctl_register(struct inet6_dev *idev)
6999 {
7000 int err;
7001
7002 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7003 return -EINVAL;
7004
7005 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7006 &ndisc_ifinfo_sysctl_change);
7007 if (err)
7008 return err;
7009 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7010 idev, &idev->cnf);
7011 if (err)
7012 neigh_sysctl_unregister(idev->nd_parms);
7013
7014 return err;
7015 }
7016
addrconf_sysctl_unregister(struct inet6_dev * idev)7017 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7018 {
7019 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7020 idev->dev->ifindex);
7021 neigh_sysctl_unregister(idev->nd_parms);
7022 }
7023
7024
7025 #endif
7026
addrconf_init_net(struct net * net)7027 static int __net_init addrconf_init_net(struct net *net)
7028 {
7029 int err = -ENOMEM;
7030 struct ipv6_devconf *all, *dflt;
7031
7032 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7033 if (!all)
7034 goto err_alloc_all;
7035
7036 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7037 if (!dflt)
7038 goto err_alloc_dflt;
7039
7040 if (IS_ENABLED(CONFIG_SYSCTL) &&
7041 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) {
7042 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf));
7043 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt));
7044 }
7045
7046 /* these will be inherited by all namespaces */
7047 dflt->autoconf = ipv6_defaults.autoconf;
7048 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7049
7050 dflt->stable_secret.initialized = false;
7051 all->stable_secret.initialized = false;
7052
7053 net->ipv6.devconf_all = all;
7054 net->ipv6.devconf_dflt = dflt;
7055
7056 #ifdef CONFIG_SYSCTL
7057 err = __addrconf_sysctl_register(net, "all", NULL, all);
7058 if (err < 0)
7059 goto err_reg_all;
7060
7061 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7062 if (err < 0)
7063 goto err_reg_dflt;
7064 #endif
7065 return 0;
7066
7067 #ifdef CONFIG_SYSCTL
7068 err_reg_dflt:
7069 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7070 err_reg_all:
7071 kfree(dflt);
7072 #endif
7073 err_alloc_dflt:
7074 kfree(all);
7075 err_alloc_all:
7076 return err;
7077 }
7078
addrconf_exit_net(struct net * net)7079 static void __net_exit addrconf_exit_net(struct net *net)
7080 {
7081 #ifdef CONFIG_SYSCTL
7082 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7083 NETCONFA_IFINDEX_DEFAULT);
7084 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7085 NETCONFA_IFINDEX_ALL);
7086 #endif
7087 kfree(net->ipv6.devconf_dflt);
7088 kfree(net->ipv6.devconf_all);
7089 }
7090
7091 static struct pernet_operations addrconf_ops = {
7092 .init = addrconf_init_net,
7093 .exit = addrconf_exit_net,
7094 };
7095
7096 static struct rtnl_af_ops inet6_ops __read_mostly = {
7097 .family = AF_INET6,
7098 .fill_link_af = inet6_fill_link_af,
7099 .get_link_af_size = inet6_get_link_af_size,
7100 .validate_link_af = inet6_validate_link_af,
7101 .set_link_af = inet6_set_link_af,
7102 };
7103
7104 /*
7105 * Init / cleanup code
7106 */
7107
addrconf_init(void)7108 int __init addrconf_init(void)
7109 {
7110 struct inet6_dev *idev;
7111 int i, err;
7112
7113 err = ipv6_addr_label_init();
7114 if (err < 0) {
7115 pr_crit("%s: cannot initialize default policy table: %d\n",
7116 __func__, err);
7117 goto out;
7118 }
7119
7120 err = register_pernet_subsys(&addrconf_ops);
7121 if (err < 0)
7122 goto out_addrlabel;
7123
7124 addrconf_wq = create_workqueue("ipv6_addrconf");
7125 if (!addrconf_wq) {
7126 err = -ENOMEM;
7127 goto out_nowq;
7128 }
7129
7130 /* The addrconf netdev notifier requires that loopback_dev
7131 * has it's ipv6 private information allocated and setup
7132 * before it can bring up and give link-local addresses
7133 * to other devices which are up.
7134 *
7135 * Unfortunately, loopback_dev is not necessarily the first
7136 * entry in the global dev_base list of net devices. In fact,
7137 * it is likely to be the very last entry on that list.
7138 * So this causes the notifier registry below to try and
7139 * give link-local addresses to all devices besides loopback_dev
7140 * first, then loopback_dev, which cases all the non-loopback_dev
7141 * devices to fail to get a link-local address.
7142 *
7143 * So, as a temporary fix, allocate the ipv6 structure for
7144 * loopback_dev first by hand.
7145 * Longer term, all of the dependencies ipv6 has upon the loopback
7146 * device and it being up should be removed.
7147 */
7148 rtnl_lock();
7149 idev = ipv6_add_dev(init_net.loopback_dev);
7150 rtnl_unlock();
7151 if (IS_ERR(idev)) {
7152 err = PTR_ERR(idev);
7153 goto errlo;
7154 }
7155
7156 ip6_route_init_special_entries();
7157
7158 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7159 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7160
7161 register_netdevice_notifier(&ipv6_dev_notf);
7162
7163 addrconf_verify();
7164
7165 rtnl_af_register(&inet6_ops);
7166
7167 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7168 NULL, inet6_dump_ifinfo, 0);
7169 if (err < 0)
7170 goto errout;
7171
7172 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7173 inet6_rtm_newaddr, NULL, 0);
7174 if (err < 0)
7175 goto errout;
7176 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7177 inet6_rtm_deladdr, NULL, 0);
7178 if (err < 0)
7179 goto errout;
7180 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7181 inet6_rtm_getaddr, inet6_dump_ifaddr,
7182 RTNL_FLAG_DOIT_UNLOCKED);
7183 if (err < 0)
7184 goto errout;
7185 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7186 NULL, inet6_dump_ifmcaddr, 0);
7187 if (err < 0)
7188 goto errout;
7189 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7190 NULL, inet6_dump_ifacaddr, 0);
7191 if (err < 0)
7192 goto errout;
7193 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7194 inet6_netconf_get_devconf,
7195 inet6_netconf_dump_devconf,
7196 RTNL_FLAG_DOIT_UNLOCKED);
7197 if (err < 0)
7198 goto errout;
7199 err = ipv6_addr_label_rtnl_register();
7200 if (err < 0)
7201 goto errout;
7202
7203 return 0;
7204 errout:
7205 rtnl_unregister_all(PF_INET6);
7206 rtnl_af_unregister(&inet6_ops);
7207 unregister_netdevice_notifier(&ipv6_dev_notf);
7208 errlo:
7209 destroy_workqueue(addrconf_wq);
7210 out_nowq:
7211 unregister_pernet_subsys(&addrconf_ops);
7212 out_addrlabel:
7213 ipv6_addr_label_cleanup();
7214 out:
7215 return err;
7216 }
7217
addrconf_cleanup(void)7218 void addrconf_cleanup(void)
7219 {
7220 struct net_device *dev;
7221 int i;
7222
7223 unregister_netdevice_notifier(&ipv6_dev_notf);
7224 unregister_pernet_subsys(&addrconf_ops);
7225 ipv6_addr_label_cleanup();
7226
7227 rtnl_af_unregister(&inet6_ops);
7228
7229 rtnl_lock();
7230
7231 /* clean dev list */
7232 for_each_netdev(&init_net, dev) {
7233 if (__in6_dev_get(dev) == NULL)
7234 continue;
7235 addrconf_ifdown(dev, 1);
7236 }
7237 addrconf_ifdown(init_net.loopback_dev, 2);
7238
7239 /*
7240 * Check hash table.
7241 */
7242 spin_lock_bh(&addrconf_hash_lock);
7243 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7244 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7245 spin_unlock_bh(&addrconf_hash_lock);
7246 cancel_delayed_work(&addr_chk_work);
7247 rtnl_unlock();
7248
7249 destroy_workqueue(addrconf_wq);
7250 }
7251