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_gen_rnd_iid(struct in6_addr *addr);
139
140 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
141 static int ipv6_count_addresses(const struct inet6_dev *idev);
142 static int ipv6_generate_stable_address(struct in6_addr *addr,
143 u8 dad_count,
144 const struct inet6_dev *idev);
145
146 #define IN6_ADDR_HSIZE_SHIFT 8
147 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
148 /*
149 * Configured unicast address hash table
150 */
151 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
152 static DEFINE_SPINLOCK(addrconf_hash_lock);
153
154 static void addrconf_verify(void);
155 static void addrconf_verify_rtnl(void);
156 static void addrconf_verify_work(struct work_struct *);
157
158 static struct workqueue_struct *addrconf_wq;
159 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
160
161 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
162 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
163
164 static void addrconf_type_change(struct net_device *dev,
165 unsigned long event);
166 static int addrconf_ifdown(struct net_device *dev, bool unregister);
167
168 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
169 int plen,
170 const struct net_device *dev,
171 u32 flags, u32 noflags,
172 bool no_gw);
173
174 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
175 static void addrconf_dad_work(struct work_struct *w);
176 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
177 bool send_na);
178 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
179 static void addrconf_rs_timer(struct timer_list *t);
180 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
181 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182
183 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
184 struct prefix_info *pinfo);
185
186 static struct ipv6_devconf ipv6_devconf __read_mostly = {
187 .forwarding = 0,
188 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
189 .mtu6 = IPV6_MIN_MTU,
190 .accept_ra = 1,
191 .accept_redirects = 1,
192 .autoconf = 1,
193 .force_mld_version = 0,
194 .mldv1_unsolicited_report_interval = 10 * HZ,
195 .mldv2_unsolicited_report_interval = HZ,
196 .dad_transmits = 1,
197 .rtr_solicits = MAX_RTR_SOLICITATIONS,
198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
199 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201 .use_tempaddr = 0,
202 .temp_valid_lft = TEMP_VALID_LIFETIME,
203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
204 .regen_max_retry = REGEN_MAX_RETRY,
205 .max_desync_factor = MAX_DESYNC_FACTOR,
206 .max_addresses = IPV6_MAX_ADDRESSES,
207 .accept_ra_defrtr = 1,
208 .accept_ra_from_local = 0,
209 .accept_ra_min_hop_limit= 1,
210 .accept_ra_pinfo = 1,
211 #ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
213 .rtr_probe_interval = 60 * HZ,
214 #ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_min_plen = 0,
216 .accept_ra_rt_info_max_plen = 0,
217 #endif
218 #endif
219 .proxy_ndp = 0,
220 .accept_source_route = 0, /* we do not accept RH0 by default. */
221 .disable_ipv6 = 0,
222 .accept_dad = 0,
223 .suppress_frag_ndisc = 1,
224 .accept_ra_mtu = 1,
225 .stable_secret = {
226 .initialized = false,
227 },
228 .use_oif_addrs_only = 0,
229 .ignore_routes_with_linkdown = 0,
230 .keep_addr_on_down = 0,
231 .seg6_enabled = 0,
232 #ifdef CONFIG_IPV6_SEG6_HMAC
233 .seg6_require_hmac = 0,
234 #endif
235 .enhanced_dad = 1,
236 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
237 .disable_policy = 0,
238 .rpl_seg_enabled = 0,
239 };
240
241 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
242 .forwarding = 0,
243 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
244 .mtu6 = IPV6_MIN_MTU,
245 .accept_ra = 1,
246 .accept_redirects = 1,
247 .autoconf = 1,
248 .force_mld_version = 0,
249 .mldv1_unsolicited_report_interval = 10 * HZ,
250 .mldv2_unsolicited_report_interval = HZ,
251 .dad_transmits = 1,
252 .rtr_solicits = MAX_RTR_SOLICITATIONS,
253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
256 .use_tempaddr = 0,
257 .temp_valid_lft = TEMP_VALID_LIFETIME,
258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
259 .regen_max_retry = REGEN_MAX_RETRY,
260 .max_desync_factor = MAX_DESYNC_FACTOR,
261 .max_addresses = IPV6_MAX_ADDRESSES,
262 .accept_ra_defrtr = 1,
263 .accept_ra_from_local = 0,
264 .accept_ra_min_hop_limit= 1,
265 .accept_ra_pinfo = 1,
266 #ifdef CONFIG_IPV6_ROUTER_PREF
267 .accept_ra_rtr_pref = 1,
268 .rtr_probe_interval = 60 * HZ,
269 #ifdef CONFIG_IPV6_ROUTE_INFO
270 .accept_ra_rt_info_min_plen = 0,
271 .accept_ra_rt_info_max_plen = 0,
272 #endif
273 #endif
274 .proxy_ndp = 0,
275 .accept_source_route = 0, /* we do not accept RH0 by default. */
276 .disable_ipv6 = 0,
277 .accept_dad = 1,
278 .suppress_frag_ndisc = 1,
279 .accept_ra_mtu = 1,
280 .stable_secret = {
281 .initialized = false,
282 },
283 .use_oif_addrs_only = 0,
284 .ignore_routes_with_linkdown = 0,
285 .keep_addr_on_down = 0,
286 .seg6_enabled = 0,
287 #ifdef CONFIG_IPV6_SEG6_HMAC
288 .seg6_require_hmac = 0,
289 #endif
290 .enhanced_dad = 1,
291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
292 .disable_policy = 0,
293 .rpl_seg_enabled = 0,
294 };
295
296 /* Check if link is ready: is it up and is a valid qdisc available */
addrconf_link_ready(const struct net_device * dev)297 static inline bool addrconf_link_ready(const struct net_device *dev)
298 {
299 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
300 }
301
addrconf_del_rs_timer(struct inet6_dev * idev)302 static void addrconf_del_rs_timer(struct inet6_dev *idev)
303 {
304 if (del_timer(&idev->rs_timer))
305 __in6_dev_put(idev);
306 }
307
addrconf_del_dad_work(struct inet6_ifaddr * ifp)308 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
309 {
310 if (cancel_delayed_work(&ifp->dad_work))
311 __in6_ifa_put(ifp);
312 }
313
addrconf_mod_rs_timer(struct inet6_dev * idev,unsigned long when)314 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
315 unsigned long when)
316 {
317 if (!mod_timer(&idev->rs_timer, jiffies + when))
318 in6_dev_hold(idev);
319 }
320
addrconf_mod_dad_work(struct inet6_ifaddr * ifp,unsigned long delay)321 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
322 unsigned long delay)
323 {
324 in6_ifa_hold(ifp);
325 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
326 in6_ifa_put(ifp);
327 }
328
snmp6_alloc_dev(struct inet6_dev * idev)329 static int snmp6_alloc_dev(struct inet6_dev *idev)
330 {
331 int i;
332
333 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
334 if (!idev->stats.ipv6)
335 goto err_ip;
336
337 for_each_possible_cpu(i) {
338 struct ipstats_mib *addrconf_stats;
339 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
340 u64_stats_init(&addrconf_stats->syncp);
341 }
342
343
344 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
345 GFP_KERNEL);
346 if (!idev->stats.icmpv6dev)
347 goto err_icmp;
348 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
349 GFP_KERNEL);
350 if (!idev->stats.icmpv6msgdev)
351 goto err_icmpmsg;
352
353 return 0;
354
355 err_icmpmsg:
356 kfree(idev->stats.icmpv6dev);
357 err_icmp:
358 free_percpu(idev->stats.ipv6);
359 err_ip:
360 return -ENOMEM;
361 }
362
ipv6_add_dev(struct net_device * dev)363 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
364 {
365 struct inet6_dev *ndev;
366 int err = -ENOMEM;
367
368 ASSERT_RTNL();
369
370 if (dev->mtu < IPV6_MIN_MTU)
371 return ERR_PTR(-EINVAL);
372
373 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
374 if (!ndev)
375 return ERR_PTR(err);
376
377 rwlock_init(&ndev->lock);
378 ndev->dev = dev;
379 INIT_LIST_HEAD(&ndev->addr_list);
380 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
381 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
382
383 if (ndev->cnf.stable_secret.initialized)
384 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
385
386 ndev->cnf.mtu6 = dev->mtu;
387 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
388 if (!ndev->nd_parms) {
389 kfree(ndev);
390 return ERR_PTR(err);
391 }
392 if (ndev->cnf.forwarding)
393 dev_disable_lro(dev);
394 /* We refer to the device */
395 dev_hold(dev);
396
397 if (snmp6_alloc_dev(ndev) < 0) {
398 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
399 __func__);
400 neigh_parms_release(&nd_tbl, ndev->nd_parms);
401 dev_put(dev);
402 kfree(ndev);
403 return ERR_PTR(err);
404 }
405
406 if (snmp6_register_dev(ndev) < 0) {
407 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
408 __func__, dev->name);
409 goto err_release;
410 }
411
412 /* One reference from device. */
413 refcount_set(&ndev->refcnt, 1);
414
415 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
416 ndev->cnf.accept_dad = -1;
417
418 #if IS_ENABLED(CONFIG_IPV6_SIT)
419 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
420 pr_info("%s: Disabled Multicast RS\n", dev->name);
421 ndev->cnf.rtr_solicits = 0;
422 }
423 #endif
424
425 INIT_LIST_HEAD(&ndev->tempaddr_list);
426 ndev->desync_factor = U32_MAX;
427 if ((dev->flags&IFF_LOOPBACK) ||
428 dev->type == ARPHRD_TUNNEL ||
429 dev->type == ARPHRD_TUNNEL6 ||
430 dev->type == ARPHRD_SIT ||
431 dev->type == ARPHRD_NONE) {
432 ndev->cnf.use_tempaddr = -1;
433 }
434
435 ndev->token = in6addr_any;
436
437 if (netif_running(dev) && addrconf_link_ready(dev))
438 ndev->if_flags |= IF_READY;
439
440 ipv6_mc_init_dev(ndev);
441 ndev->tstamp = jiffies;
442 err = addrconf_sysctl_register(ndev);
443 if (err) {
444 ipv6_mc_destroy_dev(ndev);
445 snmp6_unregister_dev(ndev);
446 goto err_release;
447 }
448 /* protected by rtnl_lock */
449 rcu_assign_pointer(dev->ip6_ptr, ndev);
450
451 /* Join interface-local all-node multicast group */
452 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
453
454 /* Join all-node multicast group */
455 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
456
457 /* Join all-router multicast group if forwarding is set */
458 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
459 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
460
461 return ndev;
462
463 err_release:
464 neigh_parms_release(&nd_tbl, ndev->nd_parms);
465 ndev->dead = 1;
466 in6_dev_finish_destroy(ndev);
467 return ERR_PTR(err);
468 }
469
ipv6_find_idev(struct net_device * dev)470 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
471 {
472 struct inet6_dev *idev;
473
474 ASSERT_RTNL();
475
476 idev = __in6_dev_get(dev);
477 if (!idev) {
478 idev = ipv6_add_dev(dev);
479 if (IS_ERR(idev))
480 return idev;
481 }
482
483 if (dev->flags&IFF_UP)
484 ipv6_mc_up(idev);
485 return idev;
486 }
487
inet6_netconf_msgsize_devconf(int type)488 static int inet6_netconf_msgsize_devconf(int type)
489 {
490 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
491 + nla_total_size(4); /* NETCONFA_IFINDEX */
492 bool all = false;
493
494 if (type == NETCONFA_ALL)
495 all = true;
496
497 if (all || type == NETCONFA_FORWARDING)
498 size += nla_total_size(4);
499 #ifdef CONFIG_IPV6_MROUTE
500 if (all || type == NETCONFA_MC_FORWARDING)
501 size += nla_total_size(4);
502 #endif
503 if (all || type == NETCONFA_PROXY_NEIGH)
504 size += nla_total_size(4);
505
506 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
507 size += nla_total_size(4);
508
509 return size;
510 }
511
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)512 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
513 struct ipv6_devconf *devconf, u32 portid,
514 u32 seq, int event, unsigned int flags,
515 int type)
516 {
517 struct nlmsghdr *nlh;
518 struct netconfmsg *ncm;
519 bool all = false;
520
521 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
522 flags);
523 if (!nlh)
524 return -EMSGSIZE;
525
526 if (type == NETCONFA_ALL)
527 all = true;
528
529 ncm = nlmsg_data(nlh);
530 ncm->ncm_family = AF_INET6;
531
532 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
533 goto nla_put_failure;
534
535 if (!devconf)
536 goto out;
537
538 if ((all || type == NETCONFA_FORWARDING) &&
539 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
540 goto nla_put_failure;
541 #ifdef CONFIG_IPV6_MROUTE
542 if ((all || type == NETCONFA_MC_FORWARDING) &&
543 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
544 atomic_read(&devconf->mc_forwarding)) < 0)
545 goto nla_put_failure;
546 #endif
547 if ((all || type == NETCONFA_PROXY_NEIGH) &&
548 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
549 goto nla_put_failure;
550
551 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
552 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
553 devconf->ignore_routes_with_linkdown) < 0)
554 goto nla_put_failure;
555
556 out:
557 nlmsg_end(skb, nlh);
558 return 0;
559
560 nla_put_failure:
561 nlmsg_cancel(skb, nlh);
562 return -EMSGSIZE;
563 }
564
inet6_netconf_notify_devconf(struct net * net,int event,int type,int ifindex,struct ipv6_devconf * devconf)565 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
566 int ifindex, struct ipv6_devconf *devconf)
567 {
568 struct sk_buff *skb;
569 int err = -ENOBUFS;
570
571 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
572 if (!skb)
573 goto errout;
574
575 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
576 event, 0, type);
577 if (err < 0) {
578 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
579 WARN_ON(err == -EMSGSIZE);
580 kfree_skb(skb);
581 goto errout;
582 }
583 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
584 return;
585 errout:
586 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
587 }
588
589 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
590 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
591 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
592 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
593 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
594 };
595
inet6_netconf_valid_get_req(struct sk_buff * skb,const struct nlmsghdr * nlh,struct nlattr ** tb,struct netlink_ext_ack * extack)596 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
597 const struct nlmsghdr *nlh,
598 struct nlattr **tb,
599 struct netlink_ext_ack *extack)
600 {
601 int i, err;
602
603 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
604 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
605 return -EINVAL;
606 }
607
608 if (!netlink_strict_get_check(skb))
609 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
610 tb, NETCONFA_MAX,
611 devconf_ipv6_policy, extack);
612
613 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
614 tb, NETCONFA_MAX,
615 devconf_ipv6_policy, extack);
616 if (err)
617 return err;
618
619 for (i = 0; i <= NETCONFA_MAX; i++) {
620 if (!tb[i])
621 continue;
622
623 switch (i) {
624 case NETCONFA_IFINDEX:
625 break;
626 default:
627 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
628 return -EINVAL;
629 }
630 }
631
632 return 0;
633 }
634
inet6_netconf_get_devconf(struct sk_buff * in_skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)635 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
636 struct nlmsghdr *nlh,
637 struct netlink_ext_ack *extack)
638 {
639 struct net *net = sock_net(in_skb->sk);
640 struct nlattr *tb[NETCONFA_MAX+1];
641 struct inet6_dev *in6_dev = NULL;
642 struct net_device *dev = NULL;
643 struct sk_buff *skb;
644 struct ipv6_devconf *devconf;
645 int ifindex;
646 int err;
647
648 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
649 if (err < 0)
650 return err;
651
652 if (!tb[NETCONFA_IFINDEX])
653 return -EINVAL;
654
655 err = -EINVAL;
656 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
657 switch (ifindex) {
658 case NETCONFA_IFINDEX_ALL:
659 devconf = net->ipv6.devconf_all;
660 break;
661 case NETCONFA_IFINDEX_DEFAULT:
662 devconf = net->ipv6.devconf_dflt;
663 break;
664 default:
665 dev = dev_get_by_index(net, ifindex);
666 if (!dev)
667 return -EINVAL;
668 in6_dev = in6_dev_get(dev);
669 if (!in6_dev)
670 goto errout;
671 devconf = &in6_dev->cnf;
672 break;
673 }
674
675 err = -ENOBUFS;
676 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
677 if (!skb)
678 goto errout;
679
680 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
681 NETLINK_CB(in_skb).portid,
682 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
683 NETCONFA_ALL);
684 if (err < 0) {
685 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
686 WARN_ON(err == -EMSGSIZE);
687 kfree_skb(skb);
688 goto errout;
689 }
690 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
691 errout:
692 if (in6_dev)
693 in6_dev_put(in6_dev);
694 if (dev)
695 dev_put(dev);
696 return err;
697 }
698
inet6_netconf_dump_devconf(struct sk_buff * skb,struct netlink_callback * cb)699 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
700 struct netlink_callback *cb)
701 {
702 const struct nlmsghdr *nlh = cb->nlh;
703 struct net *net = sock_net(skb->sk);
704 int h, s_h;
705 int idx, s_idx;
706 struct net_device *dev;
707 struct inet6_dev *idev;
708 struct hlist_head *head;
709
710 if (cb->strict_check) {
711 struct netlink_ext_ack *extack = cb->extack;
712 struct netconfmsg *ncm;
713
714 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
715 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
716 return -EINVAL;
717 }
718
719 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
720 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
721 return -EINVAL;
722 }
723 }
724
725 s_h = cb->args[0];
726 s_idx = idx = cb->args[1];
727
728 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
729 idx = 0;
730 head = &net->dev_index_head[h];
731 rcu_read_lock();
732 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
733 net->dev_base_seq;
734 hlist_for_each_entry_rcu(dev, head, index_hlist) {
735 if (idx < s_idx)
736 goto cont;
737 idev = __in6_dev_get(dev);
738 if (!idev)
739 goto cont;
740
741 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
742 &idev->cnf,
743 NETLINK_CB(cb->skb).portid,
744 nlh->nlmsg_seq,
745 RTM_NEWNETCONF,
746 NLM_F_MULTI,
747 NETCONFA_ALL) < 0) {
748 rcu_read_unlock();
749 goto done;
750 }
751 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
752 cont:
753 idx++;
754 }
755 rcu_read_unlock();
756 }
757 if (h == NETDEV_HASHENTRIES) {
758 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
759 net->ipv6.devconf_all,
760 NETLINK_CB(cb->skb).portid,
761 nlh->nlmsg_seq,
762 RTM_NEWNETCONF, NLM_F_MULTI,
763 NETCONFA_ALL) < 0)
764 goto done;
765 else
766 h++;
767 }
768 if (h == NETDEV_HASHENTRIES + 1) {
769 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
770 net->ipv6.devconf_dflt,
771 NETLINK_CB(cb->skb).portid,
772 nlh->nlmsg_seq,
773 RTM_NEWNETCONF, NLM_F_MULTI,
774 NETCONFA_ALL) < 0)
775 goto done;
776 else
777 h++;
778 }
779 done:
780 cb->args[0] = h;
781 cb->args[1] = idx;
782
783 return skb->len;
784 }
785
786 #ifdef CONFIG_SYSCTL
dev_forward_change(struct inet6_dev * idev)787 static void dev_forward_change(struct inet6_dev *idev)
788 {
789 struct net_device *dev;
790 struct inet6_ifaddr *ifa;
791 LIST_HEAD(tmp_addr_list);
792
793 if (!idev)
794 return;
795 dev = idev->dev;
796 if (idev->cnf.forwarding)
797 dev_disable_lro(dev);
798 if (dev->flags & IFF_MULTICAST) {
799 if (idev->cnf.forwarding) {
800 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
801 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
802 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
803 } else {
804 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
805 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
806 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
807 }
808 }
809
810 read_lock_bh(&idev->lock);
811 list_for_each_entry(ifa, &idev->addr_list, if_list) {
812 if (ifa->flags&IFA_F_TENTATIVE)
813 continue;
814 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
815 }
816 read_unlock_bh(&idev->lock);
817
818 while (!list_empty(&tmp_addr_list)) {
819 ifa = list_first_entry(&tmp_addr_list,
820 struct inet6_ifaddr, if_list_aux);
821 list_del(&ifa->if_list_aux);
822 if (idev->cnf.forwarding)
823 addrconf_join_anycast(ifa);
824 else
825 addrconf_leave_anycast(ifa);
826 }
827
828 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
829 NETCONFA_FORWARDING,
830 dev->ifindex, &idev->cnf);
831 }
832
833
addrconf_forward_change(struct net * net,__s32 newf)834 static void addrconf_forward_change(struct net *net, __s32 newf)
835 {
836 struct net_device *dev;
837 struct inet6_dev *idev;
838
839 for_each_netdev(net, dev) {
840 idev = __in6_dev_get(dev);
841 if (idev) {
842 int changed = (!idev->cnf.forwarding) ^ (!newf);
843 idev->cnf.forwarding = newf;
844 if (changed)
845 dev_forward_change(idev);
846 }
847 }
848 }
849
addrconf_fixup_forwarding(struct ctl_table * table,int * p,int newf)850 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
851 {
852 struct net *net;
853 int old;
854
855 if (!rtnl_trylock())
856 return restart_syscall();
857
858 net = (struct net *)table->extra2;
859 old = *p;
860 *p = newf;
861
862 if (p == &net->ipv6.devconf_dflt->forwarding) {
863 if ((!newf) ^ (!old))
864 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
865 NETCONFA_FORWARDING,
866 NETCONFA_IFINDEX_DEFAULT,
867 net->ipv6.devconf_dflt);
868 rtnl_unlock();
869 return 0;
870 }
871
872 if (p == &net->ipv6.devconf_all->forwarding) {
873 int old_dflt = net->ipv6.devconf_dflt->forwarding;
874
875 net->ipv6.devconf_dflt->forwarding = newf;
876 if ((!newf) ^ (!old_dflt))
877 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
878 NETCONFA_FORWARDING,
879 NETCONFA_IFINDEX_DEFAULT,
880 net->ipv6.devconf_dflt);
881
882 addrconf_forward_change(net, newf);
883 if ((!newf) ^ (!old))
884 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
885 NETCONFA_FORWARDING,
886 NETCONFA_IFINDEX_ALL,
887 net->ipv6.devconf_all);
888 } else if ((!newf) ^ (!old))
889 dev_forward_change((struct inet6_dev *)table->extra1);
890 rtnl_unlock();
891
892 if (newf)
893 rt6_purge_dflt_routers(net);
894 return 1;
895 }
896
addrconf_linkdown_change(struct net * net,__s32 newf)897 static void addrconf_linkdown_change(struct net *net, __s32 newf)
898 {
899 struct net_device *dev;
900 struct inet6_dev *idev;
901
902 for_each_netdev(net, dev) {
903 idev = __in6_dev_get(dev);
904 if (idev) {
905 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
906
907 idev->cnf.ignore_routes_with_linkdown = newf;
908 if (changed)
909 inet6_netconf_notify_devconf(dev_net(dev),
910 RTM_NEWNETCONF,
911 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
912 dev->ifindex,
913 &idev->cnf);
914 }
915 }
916 }
917
addrconf_fixup_linkdown(struct ctl_table * table,int * p,int newf)918 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
919 {
920 struct net *net;
921 int old;
922
923 if (!rtnl_trylock())
924 return restart_syscall();
925
926 net = (struct net *)table->extra2;
927 old = *p;
928 *p = newf;
929
930 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
931 if ((!newf) ^ (!old))
932 inet6_netconf_notify_devconf(net,
933 RTM_NEWNETCONF,
934 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
935 NETCONFA_IFINDEX_DEFAULT,
936 net->ipv6.devconf_dflt);
937 rtnl_unlock();
938 return 0;
939 }
940
941 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
942 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
943 addrconf_linkdown_change(net, newf);
944 if ((!newf) ^ (!old))
945 inet6_netconf_notify_devconf(net,
946 RTM_NEWNETCONF,
947 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
948 NETCONFA_IFINDEX_ALL,
949 net->ipv6.devconf_all);
950 }
951 rtnl_unlock();
952
953 return 1;
954 }
955
956 #endif
957
958 /* Nobody refers to this ifaddr, destroy it */
inet6_ifa_finish_destroy(struct inet6_ifaddr * ifp)959 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
960 {
961 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
962
963 #ifdef NET_REFCNT_DEBUG
964 pr_debug("%s\n", __func__);
965 #endif
966
967 in6_dev_put(ifp->idev);
968
969 if (cancel_delayed_work(&ifp->dad_work))
970 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
971 ifp);
972
973 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
974 pr_warn("Freeing alive inet6 address %p\n", ifp);
975 return;
976 }
977
978 kfree_rcu(ifp, rcu);
979 }
980
981 static void
ipv6_link_dev_addr(struct inet6_dev * idev,struct inet6_ifaddr * ifp)982 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
983 {
984 struct list_head *p;
985 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
986
987 /*
988 * Each device address list is sorted in order of scope -
989 * global before linklocal.
990 */
991 list_for_each(p, &idev->addr_list) {
992 struct inet6_ifaddr *ifa
993 = list_entry(p, struct inet6_ifaddr, if_list);
994 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
995 break;
996 }
997
998 list_add_tail_rcu(&ifp->if_list, p);
999 }
1000
inet6_addr_hash(const struct net * net,const struct in6_addr * addr)1001 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
1002 {
1003 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
1004
1005 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
1006 }
1007
ipv6_chk_same_addr(struct net * net,const struct in6_addr * addr,struct net_device * dev,unsigned int hash)1008 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1009 struct net_device *dev, unsigned int hash)
1010 {
1011 struct inet6_ifaddr *ifp;
1012
1013 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1014 if (!net_eq(dev_net(ifp->idev->dev), net))
1015 continue;
1016 if (ipv6_addr_equal(&ifp->addr, addr)) {
1017 if (!dev || ifp->idev->dev == dev)
1018 return true;
1019 }
1020 }
1021 return false;
1022 }
1023
ipv6_add_addr_hash(struct net_device * dev,struct inet6_ifaddr * ifa)1024 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1025 {
1026 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1027 int err = 0;
1028
1029 spin_lock(&addrconf_hash_lock);
1030
1031 /* Ignore adding duplicate addresses on an interface */
1032 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1033 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1034 err = -EEXIST;
1035 } else {
1036 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1037 }
1038
1039 spin_unlock(&addrconf_hash_lock);
1040
1041 return err;
1042 }
1043
1044 /* On success it returns ifp with increased reference count */
1045
1046 static struct inet6_ifaddr *
ipv6_add_addr(struct inet6_dev * idev,struct ifa6_config * cfg,bool can_block,struct netlink_ext_ack * extack)1047 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1048 bool can_block, struct netlink_ext_ack *extack)
1049 {
1050 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1051 int addr_type = ipv6_addr_type(cfg->pfx);
1052 struct net *net = dev_net(idev->dev);
1053 struct inet6_ifaddr *ifa = NULL;
1054 struct fib6_info *f6i = NULL;
1055 int err = 0;
1056
1057 if (addr_type == IPV6_ADDR_ANY ||
1058 (addr_type & IPV6_ADDR_MULTICAST &&
1059 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1060 (!(idev->dev->flags & IFF_LOOPBACK) &&
1061 !netif_is_l3_master(idev->dev) &&
1062 addr_type & IPV6_ADDR_LOOPBACK))
1063 return ERR_PTR(-EADDRNOTAVAIL);
1064
1065 if (idev->dead) {
1066 err = -ENODEV; /*XXX*/
1067 goto out;
1068 }
1069
1070 if (idev->cnf.disable_ipv6) {
1071 err = -EACCES;
1072 goto out;
1073 }
1074
1075 /* validator notifier needs to be blocking;
1076 * do not call in atomic context
1077 */
1078 if (can_block) {
1079 struct in6_validator_info i6vi = {
1080 .i6vi_addr = *cfg->pfx,
1081 .i6vi_dev = idev,
1082 .extack = extack,
1083 };
1084
1085 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1086 err = notifier_to_errno(err);
1087 if (err < 0)
1088 goto out;
1089 }
1090
1091 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1092 if (!ifa) {
1093 err = -ENOBUFS;
1094 goto out;
1095 }
1096
1097 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1098 if (IS_ERR(f6i)) {
1099 err = PTR_ERR(f6i);
1100 f6i = NULL;
1101 goto out;
1102 }
1103
1104 neigh_parms_data_state_setall(idev->nd_parms);
1105
1106 ifa->addr = *cfg->pfx;
1107 if (cfg->peer_pfx)
1108 ifa->peer_addr = *cfg->peer_pfx;
1109
1110 spin_lock_init(&ifa->lock);
1111 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1112 INIT_HLIST_NODE(&ifa->addr_lst);
1113 ifa->scope = cfg->scope;
1114 ifa->prefix_len = cfg->plen;
1115 ifa->rt_priority = cfg->rt_priority;
1116 ifa->flags = cfg->ifa_flags;
1117 /* No need to add the TENTATIVE flag for addresses with NODAD */
1118 if (!(cfg->ifa_flags & IFA_F_NODAD))
1119 ifa->flags |= IFA_F_TENTATIVE;
1120 ifa->valid_lft = cfg->valid_lft;
1121 ifa->prefered_lft = cfg->preferred_lft;
1122 ifa->cstamp = ifa->tstamp = jiffies;
1123 ifa->tokenized = false;
1124
1125 ifa->rt = f6i;
1126
1127 ifa->idev = idev;
1128 in6_dev_hold(idev);
1129
1130 /* For caller */
1131 refcount_set(&ifa->refcnt, 1);
1132
1133 rcu_read_lock_bh();
1134
1135 err = ipv6_add_addr_hash(idev->dev, ifa);
1136 if (err < 0) {
1137 rcu_read_unlock_bh();
1138 goto out;
1139 }
1140
1141 write_lock(&idev->lock);
1142
1143 /* Add to inet6_dev unicast addr list. */
1144 ipv6_link_dev_addr(idev, ifa);
1145
1146 if (ifa->flags&IFA_F_TEMPORARY) {
1147 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1148 in6_ifa_hold(ifa);
1149 }
1150
1151 in6_ifa_hold(ifa);
1152 write_unlock(&idev->lock);
1153
1154 rcu_read_unlock_bh();
1155
1156 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1157 out:
1158 if (unlikely(err < 0)) {
1159 fib6_info_release(f6i);
1160
1161 if (ifa) {
1162 if (ifa->idev)
1163 in6_dev_put(ifa->idev);
1164 kfree(ifa);
1165 }
1166 ifa = ERR_PTR(err);
1167 }
1168
1169 return ifa;
1170 }
1171
1172 enum cleanup_prefix_rt_t {
1173 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1174 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1175 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1176 };
1177
1178 /*
1179 * Check, whether the prefix for ifp would still need a prefix route
1180 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1181 * constants.
1182 *
1183 * 1) we don't purge prefix if address was not permanent.
1184 * prefix is managed by its own lifetime.
1185 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1186 * 3) if there are no addresses, delete prefix.
1187 * 4) if there are still other permanent address(es),
1188 * corresponding prefix is still permanent.
1189 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1190 * don't purge the prefix, assume user space is managing it.
1191 * 6) otherwise, update prefix lifetime to the
1192 * longest valid lifetime among the corresponding
1193 * addresses on the device.
1194 * Note: subsequent RA will update lifetime.
1195 **/
1196 static enum cleanup_prefix_rt_t
check_cleanup_prefix_route(struct inet6_ifaddr * ifp,unsigned long * expires)1197 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1198 {
1199 struct inet6_ifaddr *ifa;
1200 struct inet6_dev *idev = ifp->idev;
1201 unsigned long lifetime;
1202 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1203
1204 *expires = jiffies;
1205
1206 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1207 if (ifa == ifp)
1208 continue;
1209 if (ifa->prefix_len != ifp->prefix_len ||
1210 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1211 ifp->prefix_len))
1212 continue;
1213 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1214 return CLEANUP_PREFIX_RT_NOP;
1215
1216 action = CLEANUP_PREFIX_RT_EXPIRE;
1217
1218 spin_lock(&ifa->lock);
1219
1220 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1221 /*
1222 * Note: Because this address is
1223 * not permanent, lifetime <
1224 * LONG_MAX / HZ here.
1225 */
1226 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1227 *expires = ifa->tstamp + lifetime * HZ;
1228 spin_unlock(&ifa->lock);
1229 }
1230
1231 return action;
1232 }
1233
1234 static void
cleanup_prefix_route(struct inet6_ifaddr * ifp,unsigned long expires,bool del_rt,bool del_peer)1235 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1236 bool del_rt, bool del_peer)
1237 {
1238 struct fib6_info *f6i;
1239
1240 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1241 ifp->prefix_len,
1242 ifp->idev->dev, 0, RTF_DEFAULT, true);
1243 if (f6i) {
1244 if (del_rt)
1245 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1246 else {
1247 if (!(f6i->fib6_flags & RTF_EXPIRES))
1248 fib6_set_expires(f6i, expires);
1249 fib6_info_release(f6i);
1250 }
1251 }
1252 }
1253
1254
1255 /* This function wants to get referenced ifp and releases it before return */
1256
ipv6_del_addr(struct inet6_ifaddr * ifp)1257 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1258 {
1259 int state;
1260 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1261 unsigned long expires;
1262
1263 ASSERT_RTNL();
1264
1265 spin_lock_bh(&ifp->lock);
1266 state = ifp->state;
1267 ifp->state = INET6_IFADDR_STATE_DEAD;
1268 spin_unlock_bh(&ifp->lock);
1269
1270 if (state == INET6_IFADDR_STATE_DEAD)
1271 goto out;
1272
1273 spin_lock_bh(&addrconf_hash_lock);
1274 hlist_del_init_rcu(&ifp->addr_lst);
1275 spin_unlock_bh(&addrconf_hash_lock);
1276
1277 write_lock_bh(&ifp->idev->lock);
1278
1279 if (ifp->flags&IFA_F_TEMPORARY) {
1280 list_del(&ifp->tmp_list);
1281 if (ifp->ifpub) {
1282 in6_ifa_put(ifp->ifpub);
1283 ifp->ifpub = NULL;
1284 }
1285 __in6_ifa_put(ifp);
1286 }
1287
1288 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1289 action = check_cleanup_prefix_route(ifp, &expires);
1290
1291 list_del_rcu(&ifp->if_list);
1292 __in6_ifa_put(ifp);
1293
1294 write_unlock_bh(&ifp->idev->lock);
1295
1296 addrconf_del_dad_work(ifp);
1297
1298 ipv6_ifa_notify(RTM_DELADDR, ifp);
1299
1300 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1301
1302 if (action != CLEANUP_PREFIX_RT_NOP) {
1303 cleanup_prefix_route(ifp, expires,
1304 action == CLEANUP_PREFIX_RT_DEL, false);
1305 }
1306
1307 /* clean up prefsrc entries */
1308 rt6_remove_prefsrc(ifp);
1309 out:
1310 in6_ifa_put(ifp);
1311 }
1312
ipv6_create_tempaddr(struct inet6_ifaddr * ifp,bool block)1313 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1314 {
1315 struct inet6_dev *idev = ifp->idev;
1316 unsigned long tmp_tstamp, age;
1317 unsigned long regen_advance;
1318 unsigned long now = jiffies;
1319 s32 cnf_temp_preferred_lft;
1320 struct inet6_ifaddr *ift;
1321 struct ifa6_config cfg;
1322 long max_desync_factor;
1323 struct in6_addr addr;
1324 int ret = 0;
1325
1326 write_lock_bh(&idev->lock);
1327
1328 retry:
1329 in6_dev_hold(idev);
1330 if (idev->cnf.use_tempaddr <= 0) {
1331 write_unlock_bh(&idev->lock);
1332 pr_info("%s: use_tempaddr is disabled\n", __func__);
1333 in6_dev_put(idev);
1334 ret = -1;
1335 goto out;
1336 }
1337 spin_lock_bh(&ifp->lock);
1338 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1339 idev->cnf.use_tempaddr = -1; /*XXX*/
1340 spin_unlock_bh(&ifp->lock);
1341 write_unlock_bh(&idev->lock);
1342 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1343 __func__);
1344 in6_dev_put(idev);
1345 ret = -1;
1346 goto out;
1347 }
1348 in6_ifa_hold(ifp);
1349 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1350 ipv6_gen_rnd_iid(&addr);
1351
1352 age = (now - ifp->tstamp) / HZ;
1353
1354 regen_advance = idev->cnf.regen_max_retry *
1355 idev->cnf.dad_transmits *
1356 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1357
1358 /* recalculate max_desync_factor each time and update
1359 * idev->desync_factor if it's larger
1360 */
1361 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1362 max_desync_factor = min_t(__u32,
1363 idev->cnf.max_desync_factor,
1364 cnf_temp_preferred_lft - regen_advance);
1365
1366 if (unlikely(idev->desync_factor > max_desync_factor)) {
1367 if (max_desync_factor > 0) {
1368 get_random_bytes(&idev->desync_factor,
1369 sizeof(idev->desync_factor));
1370 idev->desync_factor %= max_desync_factor;
1371 } else {
1372 idev->desync_factor = 0;
1373 }
1374 }
1375
1376 memset(&cfg, 0, sizeof(cfg));
1377 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1378 idev->cnf.temp_valid_lft + age);
1379 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1380 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1381
1382 cfg.plen = ifp->prefix_len;
1383 tmp_tstamp = ifp->tstamp;
1384 spin_unlock_bh(&ifp->lock);
1385
1386 write_unlock_bh(&idev->lock);
1387
1388 /* A temporary address is created only if this calculated Preferred
1389 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1390 * an implementation must not create a temporary address with a zero
1391 * Preferred Lifetime.
1392 * Use age calculation as in addrconf_verify to avoid unnecessary
1393 * temporary addresses being generated.
1394 */
1395 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1396 if (cfg.preferred_lft <= regen_advance + age) {
1397 in6_ifa_put(ifp);
1398 in6_dev_put(idev);
1399 ret = -1;
1400 goto out;
1401 }
1402
1403 cfg.ifa_flags = IFA_F_TEMPORARY;
1404 /* set in addrconf_prefix_rcv() */
1405 if (ifp->flags & IFA_F_OPTIMISTIC)
1406 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1407
1408 cfg.pfx = &addr;
1409 cfg.scope = ipv6_addr_scope(cfg.pfx);
1410
1411 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1412 if (IS_ERR(ift)) {
1413 in6_ifa_put(ifp);
1414 in6_dev_put(idev);
1415 pr_info("%s: retry temporary address regeneration\n", __func__);
1416 write_lock_bh(&idev->lock);
1417 goto retry;
1418 }
1419
1420 spin_lock_bh(&ift->lock);
1421 ift->ifpub = ifp;
1422 ift->cstamp = now;
1423 ift->tstamp = tmp_tstamp;
1424 spin_unlock_bh(&ift->lock);
1425
1426 addrconf_dad_start(ift);
1427 in6_ifa_put(ift);
1428 in6_dev_put(idev);
1429 out:
1430 return ret;
1431 }
1432
1433 /*
1434 * Choose an appropriate source address (RFC3484)
1435 */
1436 enum {
1437 IPV6_SADDR_RULE_INIT = 0,
1438 IPV6_SADDR_RULE_LOCAL,
1439 IPV6_SADDR_RULE_SCOPE,
1440 IPV6_SADDR_RULE_PREFERRED,
1441 #ifdef CONFIG_IPV6_MIP6
1442 IPV6_SADDR_RULE_HOA,
1443 #endif
1444 IPV6_SADDR_RULE_OIF,
1445 IPV6_SADDR_RULE_LABEL,
1446 IPV6_SADDR_RULE_PRIVACY,
1447 IPV6_SADDR_RULE_ORCHID,
1448 IPV6_SADDR_RULE_PREFIX,
1449 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1450 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1451 #endif
1452 IPV6_SADDR_RULE_MAX
1453 };
1454
1455 struct ipv6_saddr_score {
1456 int rule;
1457 int addr_type;
1458 struct inet6_ifaddr *ifa;
1459 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1460 int scopedist;
1461 int matchlen;
1462 };
1463
1464 struct ipv6_saddr_dst {
1465 const struct in6_addr *addr;
1466 int ifindex;
1467 int scope;
1468 int label;
1469 unsigned int prefs;
1470 };
1471
ipv6_saddr_preferred(int type)1472 static inline int ipv6_saddr_preferred(int type)
1473 {
1474 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1475 return 1;
1476 return 0;
1477 }
1478
ipv6_use_optimistic_addr(struct net * net,struct inet6_dev * idev)1479 static bool ipv6_use_optimistic_addr(struct net *net,
1480 struct inet6_dev *idev)
1481 {
1482 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1483 if (!idev)
1484 return false;
1485 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1486 return false;
1487 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1488 return false;
1489
1490 return true;
1491 #else
1492 return false;
1493 #endif
1494 }
1495
ipv6_allow_optimistic_dad(struct net * net,struct inet6_dev * idev)1496 static bool ipv6_allow_optimistic_dad(struct net *net,
1497 struct inet6_dev *idev)
1498 {
1499 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1500 if (!idev)
1501 return false;
1502 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1503 return false;
1504
1505 return true;
1506 #else
1507 return false;
1508 #endif
1509 }
1510
ipv6_get_saddr_eval(struct net * net,struct ipv6_saddr_score * score,struct ipv6_saddr_dst * dst,int i)1511 static int ipv6_get_saddr_eval(struct net *net,
1512 struct ipv6_saddr_score *score,
1513 struct ipv6_saddr_dst *dst,
1514 int i)
1515 {
1516 int ret;
1517
1518 if (i <= score->rule) {
1519 switch (i) {
1520 case IPV6_SADDR_RULE_SCOPE:
1521 ret = score->scopedist;
1522 break;
1523 case IPV6_SADDR_RULE_PREFIX:
1524 ret = score->matchlen;
1525 break;
1526 default:
1527 ret = !!test_bit(i, score->scorebits);
1528 }
1529 goto out;
1530 }
1531
1532 switch (i) {
1533 case IPV6_SADDR_RULE_INIT:
1534 /* Rule 0: remember if hiscore is not ready yet */
1535 ret = !!score->ifa;
1536 break;
1537 case IPV6_SADDR_RULE_LOCAL:
1538 /* Rule 1: Prefer same address */
1539 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1540 break;
1541 case IPV6_SADDR_RULE_SCOPE:
1542 /* Rule 2: Prefer appropriate scope
1543 *
1544 * ret
1545 * ^
1546 * -1 | d 15
1547 * ---+--+-+---> scope
1548 * |
1549 * | d is scope of the destination.
1550 * B-d | \
1551 * | \ <- smaller scope is better if
1552 * B-15 | \ if scope is enough for destination.
1553 * | ret = B - scope (-1 <= scope >= d <= 15).
1554 * d-C-1 | /
1555 * |/ <- greater is better
1556 * -C / if scope is not enough for destination.
1557 * /| ret = scope - C (-1 <= d < scope <= 15).
1558 *
1559 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1560 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1561 * Assume B = 0 and we get C > 29.
1562 */
1563 ret = __ipv6_addr_src_scope(score->addr_type);
1564 if (ret >= dst->scope)
1565 ret = -ret;
1566 else
1567 ret -= 128; /* 30 is enough */
1568 score->scopedist = ret;
1569 break;
1570 case IPV6_SADDR_RULE_PREFERRED:
1571 {
1572 /* Rule 3: Avoid deprecated and optimistic addresses */
1573 u8 avoid = IFA_F_DEPRECATED;
1574
1575 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1576 avoid |= IFA_F_OPTIMISTIC;
1577 ret = ipv6_saddr_preferred(score->addr_type) ||
1578 !(score->ifa->flags & avoid);
1579 break;
1580 }
1581 #ifdef CONFIG_IPV6_MIP6
1582 case IPV6_SADDR_RULE_HOA:
1583 {
1584 /* Rule 4: Prefer home address */
1585 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1586 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1587 break;
1588 }
1589 #endif
1590 case IPV6_SADDR_RULE_OIF:
1591 /* Rule 5: Prefer outgoing interface */
1592 ret = (!dst->ifindex ||
1593 dst->ifindex == score->ifa->idev->dev->ifindex);
1594 break;
1595 case IPV6_SADDR_RULE_LABEL:
1596 /* Rule 6: Prefer matching label */
1597 ret = ipv6_addr_label(net,
1598 &score->ifa->addr, score->addr_type,
1599 score->ifa->idev->dev->ifindex) == dst->label;
1600 break;
1601 case IPV6_SADDR_RULE_PRIVACY:
1602 {
1603 /* Rule 7: Prefer public address
1604 * Note: prefer temporary address if use_tempaddr >= 2
1605 */
1606 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1607 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1608 score->ifa->idev->cnf.use_tempaddr >= 2;
1609 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1610 break;
1611 }
1612 case IPV6_SADDR_RULE_ORCHID:
1613 /* Rule 8-: Prefer ORCHID vs ORCHID or
1614 * non-ORCHID vs non-ORCHID
1615 */
1616 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1617 ipv6_addr_orchid(dst->addr));
1618 break;
1619 case IPV6_SADDR_RULE_PREFIX:
1620 /* Rule 8: Use longest matching prefix */
1621 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1622 if (ret > score->ifa->prefix_len)
1623 ret = score->ifa->prefix_len;
1624 score->matchlen = ret;
1625 break;
1626 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1627 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1628 /* Optimistic addresses still have lower precedence than other
1629 * preferred addresses.
1630 */
1631 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1632 break;
1633 #endif
1634 default:
1635 ret = 0;
1636 }
1637
1638 if (ret)
1639 __set_bit(i, score->scorebits);
1640 score->rule = i;
1641 out:
1642 return ret;
1643 }
1644
__ipv6_dev_get_saddr(struct net * net,struct ipv6_saddr_dst * dst,struct inet6_dev * idev,struct ipv6_saddr_score * scores,int hiscore_idx)1645 static int __ipv6_dev_get_saddr(struct net *net,
1646 struct ipv6_saddr_dst *dst,
1647 struct inet6_dev *idev,
1648 struct ipv6_saddr_score *scores,
1649 int hiscore_idx)
1650 {
1651 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1652
1653 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1654 int i;
1655
1656 /*
1657 * - Tentative Address (RFC2462 section 5.4)
1658 * - A tentative address is not considered
1659 * "assigned to an interface" in the traditional
1660 * sense, unless it is also flagged as optimistic.
1661 * - Candidate Source Address (section 4)
1662 * - In any case, anycast addresses, multicast
1663 * addresses, and the unspecified address MUST
1664 * NOT be included in a candidate set.
1665 */
1666 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1667 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1668 continue;
1669
1670 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1671
1672 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1673 score->addr_type & IPV6_ADDR_MULTICAST)) {
1674 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1675 idev->dev->name);
1676 continue;
1677 }
1678
1679 score->rule = -1;
1680 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1681
1682 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1683 int minihiscore, miniscore;
1684
1685 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1686 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1687
1688 if (minihiscore > miniscore) {
1689 if (i == IPV6_SADDR_RULE_SCOPE &&
1690 score->scopedist > 0) {
1691 /*
1692 * special case:
1693 * each remaining entry
1694 * has too small (not enough)
1695 * scope, because ifa entries
1696 * are sorted by their scope
1697 * values.
1698 */
1699 goto out;
1700 }
1701 break;
1702 } else if (minihiscore < miniscore) {
1703 swap(hiscore, score);
1704 hiscore_idx = 1 - hiscore_idx;
1705
1706 /* restore our iterator */
1707 score->ifa = hiscore->ifa;
1708
1709 break;
1710 }
1711 }
1712 }
1713 out:
1714 return hiscore_idx;
1715 }
1716
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)1717 static int ipv6_get_saddr_master(struct net *net,
1718 const struct net_device *dst_dev,
1719 const struct net_device *master,
1720 struct ipv6_saddr_dst *dst,
1721 struct ipv6_saddr_score *scores,
1722 int hiscore_idx)
1723 {
1724 struct inet6_dev *idev;
1725
1726 idev = __in6_dev_get(dst_dev);
1727 if (idev)
1728 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1729 scores, hiscore_idx);
1730
1731 idev = __in6_dev_get(master);
1732 if (idev)
1733 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1734 scores, hiscore_idx);
1735
1736 return hiscore_idx;
1737 }
1738
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)1739 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1740 const struct in6_addr *daddr, unsigned int prefs,
1741 struct in6_addr *saddr)
1742 {
1743 struct ipv6_saddr_score scores[2], *hiscore;
1744 struct ipv6_saddr_dst dst;
1745 struct inet6_dev *idev;
1746 struct net_device *dev;
1747 int dst_type;
1748 bool use_oif_addr = false;
1749 int hiscore_idx = 0;
1750 int ret = 0;
1751
1752 dst_type = __ipv6_addr_type(daddr);
1753 dst.addr = daddr;
1754 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1755 dst.scope = __ipv6_addr_src_scope(dst_type);
1756 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1757 dst.prefs = prefs;
1758
1759 scores[hiscore_idx].rule = -1;
1760 scores[hiscore_idx].ifa = NULL;
1761
1762 rcu_read_lock();
1763
1764 /* Candidate Source Address (section 4)
1765 * - multicast and link-local destination address,
1766 * the set of candidate source address MUST only
1767 * include addresses assigned to interfaces
1768 * belonging to the same link as the outgoing
1769 * interface.
1770 * (- For site-local destination addresses, the
1771 * set of candidate source addresses MUST only
1772 * include addresses assigned to interfaces
1773 * belonging to the same site as the outgoing
1774 * interface.)
1775 * - "It is RECOMMENDED that the candidate source addresses
1776 * be the set of unicast addresses assigned to the
1777 * interface that will be used to send to the destination
1778 * (the 'outgoing' interface)." (RFC 6724)
1779 */
1780 if (dst_dev) {
1781 idev = __in6_dev_get(dst_dev);
1782 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1783 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1784 (idev && idev->cnf.use_oif_addrs_only)) {
1785 use_oif_addr = true;
1786 }
1787 }
1788
1789 if (use_oif_addr) {
1790 if (idev)
1791 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1792 } else {
1793 const struct net_device *master;
1794 int master_idx = 0;
1795
1796 /* if dst_dev exists and is enslaved to an L3 device, then
1797 * prefer addresses from dst_dev and then the master over
1798 * any other enslaved devices in the L3 domain.
1799 */
1800 master = l3mdev_master_dev_rcu(dst_dev);
1801 if (master) {
1802 master_idx = master->ifindex;
1803
1804 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1805 master, &dst,
1806 scores, hiscore_idx);
1807
1808 if (scores[hiscore_idx].ifa)
1809 goto out;
1810 }
1811
1812 for_each_netdev_rcu(net, dev) {
1813 /* only consider addresses on devices in the
1814 * same L3 domain
1815 */
1816 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1817 continue;
1818 idev = __in6_dev_get(dev);
1819 if (!idev)
1820 continue;
1821 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1822 }
1823 }
1824
1825 out:
1826 hiscore = &scores[hiscore_idx];
1827 if (!hiscore->ifa)
1828 ret = -EADDRNOTAVAIL;
1829 else
1830 *saddr = hiscore->ifa->addr;
1831
1832 rcu_read_unlock();
1833 return ret;
1834 }
1835 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1836
__ipv6_get_lladdr(struct inet6_dev * idev,struct in6_addr * addr,u32 banned_flags)1837 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1838 u32 banned_flags)
1839 {
1840 struct inet6_ifaddr *ifp;
1841 int err = -EADDRNOTAVAIL;
1842
1843 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1844 if (ifp->scope > IFA_LINK)
1845 break;
1846 if (ifp->scope == IFA_LINK &&
1847 !(ifp->flags & banned_flags)) {
1848 *addr = ifp->addr;
1849 err = 0;
1850 break;
1851 }
1852 }
1853 return err;
1854 }
1855
ipv6_get_lladdr(struct net_device * dev,struct in6_addr * addr,u32 banned_flags)1856 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1857 u32 banned_flags)
1858 {
1859 struct inet6_dev *idev;
1860 int err = -EADDRNOTAVAIL;
1861
1862 rcu_read_lock();
1863 idev = __in6_dev_get(dev);
1864 if (idev) {
1865 read_lock_bh(&idev->lock);
1866 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1867 read_unlock_bh(&idev->lock);
1868 }
1869 rcu_read_unlock();
1870 return err;
1871 }
1872
ipv6_count_addresses(const struct inet6_dev * idev)1873 static int ipv6_count_addresses(const struct inet6_dev *idev)
1874 {
1875 const struct inet6_ifaddr *ifp;
1876 int cnt = 0;
1877
1878 rcu_read_lock();
1879 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1880 cnt++;
1881 rcu_read_unlock();
1882 return cnt;
1883 }
1884
ipv6_chk_addr(struct net * net,const struct in6_addr * addr,const struct net_device * dev,int strict)1885 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1886 const struct net_device *dev, int strict)
1887 {
1888 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1889 strict, IFA_F_TENTATIVE);
1890 }
1891 EXPORT_SYMBOL(ipv6_chk_addr);
1892
1893 /* device argument is used to find the L3 domain of interest. If
1894 * skip_dev_check is set, then the ifp device is not checked against
1895 * the passed in dev argument. So the 2 cases for addresses checks are:
1896 * 1. does the address exist in the L3 domain that dev is part of
1897 * (skip_dev_check = true), or
1898 *
1899 * 2. does the address exist on the specific device
1900 * (skip_dev_check = false)
1901 */
1902 static struct net_device *
__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)1903 __ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1904 const struct net_device *dev, bool skip_dev_check,
1905 int strict, u32 banned_flags)
1906 {
1907 unsigned int hash = inet6_addr_hash(net, addr);
1908 struct net_device *l3mdev, *ndev;
1909 struct inet6_ifaddr *ifp;
1910 u32 ifp_flags;
1911
1912 rcu_read_lock();
1913
1914 l3mdev = l3mdev_master_dev_rcu(dev);
1915 if (skip_dev_check)
1916 dev = NULL;
1917
1918 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1919 ndev = ifp->idev->dev;
1920 if (!net_eq(dev_net(ndev), net))
1921 continue;
1922
1923 if (l3mdev_master_dev_rcu(ndev) != l3mdev)
1924 continue;
1925
1926 /* Decouple optimistic from tentative for evaluation here.
1927 * Ban optimistic addresses explicitly, when required.
1928 */
1929 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1930 ? (ifp->flags&~IFA_F_TENTATIVE)
1931 : ifp->flags;
1932 if (ipv6_addr_equal(&ifp->addr, addr) &&
1933 !(ifp_flags&banned_flags) &&
1934 (!dev || ndev == dev ||
1935 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1936 rcu_read_unlock();
1937 return ndev;
1938 }
1939 }
1940
1941 rcu_read_unlock();
1942 return NULL;
1943 }
1944
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)1945 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1946 const struct net_device *dev, bool skip_dev_check,
1947 int strict, u32 banned_flags)
1948 {
1949 return __ipv6_chk_addr_and_flags(net, addr, dev, skip_dev_check,
1950 strict, banned_flags) ? 1 : 0;
1951 }
1952 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1953
1954
1955 /* Compares an address/prefix_len with addresses on device @dev.
1956 * If one is found it returns true.
1957 */
ipv6_chk_custom_prefix(const struct in6_addr * addr,const unsigned int prefix_len,struct net_device * dev)1958 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1959 const unsigned int prefix_len, struct net_device *dev)
1960 {
1961 const struct inet6_ifaddr *ifa;
1962 const struct inet6_dev *idev;
1963 bool ret = false;
1964
1965 rcu_read_lock();
1966 idev = __in6_dev_get(dev);
1967 if (idev) {
1968 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1969 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1970 if (ret)
1971 break;
1972 }
1973 }
1974 rcu_read_unlock();
1975
1976 return ret;
1977 }
1978 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1979
ipv6_chk_prefix(const struct in6_addr * addr,struct net_device * dev)1980 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1981 {
1982 const struct inet6_ifaddr *ifa;
1983 const struct inet6_dev *idev;
1984 int onlink;
1985
1986 onlink = 0;
1987 rcu_read_lock();
1988 idev = __in6_dev_get(dev);
1989 if (idev) {
1990 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1991 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1992 ifa->prefix_len);
1993 if (onlink)
1994 break;
1995 }
1996 }
1997 rcu_read_unlock();
1998 return onlink;
1999 }
2000 EXPORT_SYMBOL(ipv6_chk_prefix);
2001
2002 /**
2003 * ipv6_dev_find - find the first device with a given source address.
2004 * @net: the net namespace
2005 * @addr: the source address
2006 *
2007 * The caller should be protected by RCU, or RTNL.
2008 */
ipv6_dev_find(struct net * net,const struct in6_addr * addr,struct net_device * dev)2009 struct net_device *ipv6_dev_find(struct net *net, const struct in6_addr *addr,
2010 struct net_device *dev)
2011 {
2012 return __ipv6_chk_addr_and_flags(net, addr, dev, !dev, 1,
2013 IFA_F_TENTATIVE);
2014 }
2015 EXPORT_SYMBOL(ipv6_dev_find);
2016
ipv6_get_ifaddr(struct net * net,const struct in6_addr * addr,struct net_device * dev,int strict)2017 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
2018 struct net_device *dev, int strict)
2019 {
2020 unsigned int hash = inet6_addr_hash(net, addr);
2021 struct inet6_ifaddr *ifp, *result = NULL;
2022
2023 rcu_read_lock();
2024 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2025 if (!net_eq(dev_net(ifp->idev->dev), net))
2026 continue;
2027 if (ipv6_addr_equal(&ifp->addr, addr)) {
2028 if (!dev || ifp->idev->dev == dev ||
2029 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2030 result = ifp;
2031 in6_ifa_hold(ifp);
2032 break;
2033 }
2034 }
2035 }
2036 rcu_read_unlock();
2037
2038 return result;
2039 }
2040
2041 /* Gets referenced address, destroys ifaddr */
2042
addrconf_dad_stop(struct inet6_ifaddr * ifp,int dad_failed)2043 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2044 {
2045 if (dad_failed)
2046 ifp->flags |= IFA_F_DADFAILED;
2047
2048 if (ifp->flags&IFA_F_TEMPORARY) {
2049 struct inet6_ifaddr *ifpub;
2050 spin_lock_bh(&ifp->lock);
2051 ifpub = ifp->ifpub;
2052 if (ifpub) {
2053 in6_ifa_hold(ifpub);
2054 spin_unlock_bh(&ifp->lock);
2055 ipv6_create_tempaddr(ifpub, true);
2056 in6_ifa_put(ifpub);
2057 } else {
2058 spin_unlock_bh(&ifp->lock);
2059 }
2060 ipv6_del_addr(ifp);
2061 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2062 spin_lock_bh(&ifp->lock);
2063 addrconf_del_dad_work(ifp);
2064 ifp->flags |= IFA_F_TENTATIVE;
2065 if (dad_failed)
2066 ifp->flags &= ~IFA_F_OPTIMISTIC;
2067 spin_unlock_bh(&ifp->lock);
2068 if (dad_failed)
2069 ipv6_ifa_notify(0, ifp);
2070 in6_ifa_put(ifp);
2071 } else {
2072 ipv6_del_addr(ifp);
2073 }
2074 }
2075
addrconf_dad_end(struct inet6_ifaddr * ifp)2076 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2077 {
2078 int err = -ENOENT;
2079
2080 spin_lock_bh(&ifp->lock);
2081 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2082 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2083 err = 0;
2084 }
2085 spin_unlock_bh(&ifp->lock);
2086
2087 return err;
2088 }
2089
addrconf_dad_failure(struct sk_buff * skb,struct inet6_ifaddr * ifp)2090 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2091 {
2092 struct inet6_dev *idev = ifp->idev;
2093 struct net *net = dev_net(ifp->idev->dev);
2094
2095 if (addrconf_dad_end(ifp)) {
2096 in6_ifa_put(ifp);
2097 return;
2098 }
2099
2100 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2101 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2102
2103 spin_lock_bh(&ifp->lock);
2104
2105 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2106 struct in6_addr new_addr;
2107 struct inet6_ifaddr *ifp2;
2108 int retries = ifp->stable_privacy_retry + 1;
2109 struct ifa6_config cfg = {
2110 .pfx = &new_addr,
2111 .plen = ifp->prefix_len,
2112 .ifa_flags = ifp->flags,
2113 .valid_lft = ifp->valid_lft,
2114 .preferred_lft = ifp->prefered_lft,
2115 .scope = ifp->scope,
2116 };
2117
2118 if (retries > net->ipv6.sysctl.idgen_retries) {
2119 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2120 ifp->idev->dev->name);
2121 goto errdad;
2122 }
2123
2124 new_addr = ifp->addr;
2125 if (ipv6_generate_stable_address(&new_addr, retries,
2126 idev))
2127 goto errdad;
2128
2129 spin_unlock_bh(&ifp->lock);
2130
2131 if (idev->cnf.max_addresses &&
2132 ipv6_count_addresses(idev) >=
2133 idev->cnf.max_addresses)
2134 goto lock_errdad;
2135
2136 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2137 ifp->idev->dev->name);
2138
2139 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2140 if (IS_ERR(ifp2))
2141 goto lock_errdad;
2142
2143 spin_lock_bh(&ifp2->lock);
2144 ifp2->stable_privacy_retry = retries;
2145 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2146 spin_unlock_bh(&ifp2->lock);
2147
2148 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2149 in6_ifa_put(ifp2);
2150 lock_errdad:
2151 spin_lock_bh(&ifp->lock);
2152 }
2153
2154 errdad:
2155 /* transition from _POSTDAD to _ERRDAD */
2156 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2157 spin_unlock_bh(&ifp->lock);
2158
2159 addrconf_mod_dad_work(ifp, 0);
2160 in6_ifa_put(ifp);
2161 }
2162
2163 /* Join to solicited addr multicast group.
2164 * caller must hold RTNL */
addrconf_join_solict(struct net_device * dev,const struct in6_addr * addr)2165 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2166 {
2167 struct in6_addr maddr;
2168
2169 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2170 return;
2171
2172 addrconf_addr_solict_mult(addr, &maddr);
2173 ipv6_dev_mc_inc(dev, &maddr);
2174 }
2175
2176 /* caller must hold RTNL */
addrconf_leave_solict(struct inet6_dev * idev,const struct in6_addr * addr)2177 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2178 {
2179 struct in6_addr maddr;
2180
2181 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2182 return;
2183
2184 addrconf_addr_solict_mult(addr, &maddr);
2185 __ipv6_dev_mc_dec(idev, &maddr);
2186 }
2187
2188 /* caller must hold RTNL */
addrconf_join_anycast(struct inet6_ifaddr * ifp)2189 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2190 {
2191 struct in6_addr addr;
2192
2193 if (ifp->prefix_len >= 127) /* RFC 6164 */
2194 return;
2195 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2196 if (ipv6_addr_any(&addr))
2197 return;
2198 __ipv6_dev_ac_inc(ifp->idev, &addr);
2199 }
2200
2201 /* caller must hold RTNL */
addrconf_leave_anycast(struct inet6_ifaddr * ifp)2202 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2203 {
2204 struct in6_addr addr;
2205
2206 if (ifp->prefix_len >= 127) /* RFC 6164 */
2207 return;
2208 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2209 if (ipv6_addr_any(&addr))
2210 return;
2211 __ipv6_dev_ac_dec(ifp->idev, &addr);
2212 }
2213
addrconf_ifid_6lowpan(u8 * eui,struct net_device * dev)2214 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2215 {
2216 switch (dev->addr_len) {
2217 case ETH_ALEN:
2218 memcpy(eui, dev->dev_addr, 3);
2219 eui[3] = 0xFF;
2220 eui[4] = 0xFE;
2221 memcpy(eui + 5, dev->dev_addr + 3, 3);
2222 break;
2223 case EUI64_ADDR_LEN:
2224 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2225 eui[0] ^= 2;
2226 break;
2227 default:
2228 return -1;
2229 }
2230
2231 return 0;
2232 }
2233
addrconf_ifid_ieee1394(u8 * eui,struct net_device * dev)2234 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2235 {
2236 union fwnet_hwaddr *ha;
2237
2238 if (dev->addr_len != FWNET_ALEN)
2239 return -1;
2240
2241 ha = (union fwnet_hwaddr *)dev->dev_addr;
2242
2243 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2244 eui[0] ^= 2;
2245 return 0;
2246 }
2247
addrconf_ifid_arcnet(u8 * eui,struct net_device * dev)2248 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2249 {
2250 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2251 if (dev->addr_len != ARCNET_ALEN)
2252 return -1;
2253 memset(eui, 0, 7);
2254 eui[7] = *(u8 *)dev->dev_addr;
2255 return 0;
2256 }
2257
addrconf_ifid_infiniband(u8 * eui,struct net_device * dev)2258 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2259 {
2260 if (dev->addr_len != INFINIBAND_ALEN)
2261 return -1;
2262 memcpy(eui, dev->dev_addr + 12, 8);
2263 eui[0] |= 2;
2264 return 0;
2265 }
2266
__ipv6_isatap_ifid(u8 * eui,__be32 addr)2267 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2268 {
2269 if (addr == 0)
2270 return -1;
2271 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2272 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2273 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2274 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2275 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2276 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2277 eui[1] = 0;
2278 eui[2] = 0x5E;
2279 eui[3] = 0xFE;
2280 memcpy(eui + 4, &addr, 4);
2281 return 0;
2282 }
2283
addrconf_ifid_sit(u8 * eui,struct net_device * dev)2284 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2285 {
2286 if (dev->priv_flags & IFF_ISATAP)
2287 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2288 return -1;
2289 }
2290
addrconf_ifid_gre(u8 * eui,struct net_device * dev)2291 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2292 {
2293 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2294 }
2295
addrconf_ifid_ip6tnl(u8 * eui,struct net_device * dev)2296 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2297 {
2298 memcpy(eui, dev->perm_addr, 3);
2299 memcpy(eui + 5, dev->perm_addr + 3, 3);
2300 eui[3] = 0xFF;
2301 eui[4] = 0xFE;
2302 eui[0] ^= 2;
2303 return 0;
2304 }
2305
ipv6_generate_eui64(u8 * eui,struct net_device * dev)2306 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2307 {
2308 switch (dev->type) {
2309 case ARPHRD_ETHER:
2310 case ARPHRD_FDDI:
2311 return addrconf_ifid_eui48(eui, dev);
2312 case ARPHRD_ARCNET:
2313 return addrconf_ifid_arcnet(eui, dev);
2314 case ARPHRD_INFINIBAND:
2315 return addrconf_ifid_infiniband(eui, dev);
2316 case ARPHRD_SIT:
2317 return addrconf_ifid_sit(eui, dev);
2318 case ARPHRD_IPGRE:
2319 case ARPHRD_TUNNEL:
2320 return addrconf_ifid_gre(eui, dev);
2321 case ARPHRD_6LOWPAN:
2322 return addrconf_ifid_6lowpan(eui, dev);
2323 case ARPHRD_IEEE1394:
2324 return addrconf_ifid_ieee1394(eui, dev);
2325 case ARPHRD_TUNNEL6:
2326 case ARPHRD_IP6GRE:
2327 case ARPHRD_RAWIP:
2328 return addrconf_ifid_ip6tnl(eui, dev);
2329 }
2330 return -1;
2331 }
2332
ipv6_inherit_eui64(u8 * eui,struct inet6_dev * idev)2333 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2334 {
2335 int err = -1;
2336 struct inet6_ifaddr *ifp;
2337
2338 read_lock_bh(&idev->lock);
2339 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2340 if (ifp->scope > IFA_LINK)
2341 break;
2342 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2343 memcpy(eui, ifp->addr.s6_addr+8, 8);
2344 err = 0;
2345 break;
2346 }
2347 }
2348 read_unlock_bh(&idev->lock);
2349 return err;
2350 }
2351
2352 /* Generation of a randomized Interface Identifier
2353 * draft-ietf-6man-rfc4941bis, Section 3.3.1
2354 */
2355
ipv6_gen_rnd_iid(struct in6_addr * addr)2356 static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2357 {
2358 regen:
2359 get_random_bytes(&addr->s6_addr[8], 8);
2360
2361 /* <draft-ietf-6man-rfc4941bis-08.txt>, Section 3.3.1:
2362 * check if generated address is not inappropriate:
2363 *
2364 * - Reserved IPv6 Interface Identifers
2365 * - XXX: already assigned to an address on the device
2366 */
2367
2368 /* Subnet-router anycast: 0000:0000:0000:0000 */
2369 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2370 goto regen;
2371
2372 /* IANA Ethernet block: 0200:5EFF:FE00:0000-0200:5EFF:FE00:5212
2373 * Proxy Mobile IPv6: 0200:5EFF:FE00:5213
2374 * IANA Ethernet block: 0200:5EFF:FE00:5214-0200:5EFF:FEFF:FFFF
2375 */
2376 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2377 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2378 goto regen;
2379
2380 /* Reserved subnet anycast addresses */
2381 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2382 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2383 goto regen;
2384 }
2385
2386 /*
2387 * Add prefix route.
2388 */
2389
2390 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)2391 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2392 struct net_device *dev, unsigned long expires,
2393 u32 flags, gfp_t gfp_flags)
2394 {
2395 struct fib6_config cfg = {
2396 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2397 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2398 .fc_ifindex = dev->ifindex,
2399 .fc_expires = expires,
2400 .fc_dst_len = plen,
2401 .fc_flags = RTF_UP | flags,
2402 .fc_nlinfo.nl_net = dev_net(dev),
2403 .fc_protocol = RTPROT_KERNEL,
2404 .fc_type = RTN_UNICAST,
2405 };
2406
2407 cfg.fc_dst = *pfx;
2408
2409 /* Prevent useless cloning on PtP SIT.
2410 This thing is done here expecting that the whole
2411 class of non-broadcast devices need not cloning.
2412 */
2413 #if IS_ENABLED(CONFIG_IPV6_SIT)
2414 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2415 cfg.fc_flags |= RTF_NONEXTHOP;
2416 #endif
2417
2418 ip6_route_add(&cfg, gfp_flags, NULL);
2419 }
2420
2421
addrconf_get_prefix_route(const struct in6_addr * pfx,int plen,const struct net_device * dev,u32 flags,u32 noflags,bool no_gw)2422 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2423 int plen,
2424 const struct net_device *dev,
2425 u32 flags, u32 noflags,
2426 bool no_gw)
2427 {
2428 struct fib6_node *fn;
2429 struct fib6_info *rt = NULL;
2430 struct fib6_table *table;
2431 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2432
2433 table = fib6_get_table(dev_net(dev), tb_id);
2434 if (!table)
2435 return NULL;
2436
2437 rcu_read_lock();
2438 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2439 if (!fn)
2440 goto out;
2441
2442 for_each_fib6_node_rt_rcu(fn) {
2443 /* prefix routes only use builtin fib6_nh */
2444 if (rt->nh)
2445 continue;
2446
2447 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2448 continue;
2449 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2450 continue;
2451 if ((rt->fib6_flags & flags) != flags)
2452 continue;
2453 if ((rt->fib6_flags & noflags) != 0)
2454 continue;
2455 if (!fib6_info_hold_safe(rt))
2456 continue;
2457 break;
2458 }
2459 out:
2460 rcu_read_unlock();
2461 return rt;
2462 }
2463
2464
2465 /* Create "default" multicast route to the interface */
2466
addrconf_add_mroute(struct net_device * dev)2467 static void addrconf_add_mroute(struct net_device *dev)
2468 {
2469 struct fib6_config cfg = {
2470 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2471 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2472 .fc_ifindex = dev->ifindex,
2473 .fc_dst_len = 8,
2474 .fc_flags = RTF_UP,
2475 .fc_type = RTN_MULTICAST,
2476 .fc_nlinfo.nl_net = dev_net(dev),
2477 .fc_protocol = RTPROT_KERNEL,
2478 };
2479
2480 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2481
2482 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2483 }
2484
addrconf_add_dev(struct net_device * dev)2485 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2486 {
2487 struct inet6_dev *idev;
2488
2489 ASSERT_RTNL();
2490
2491 idev = ipv6_find_idev(dev);
2492 if (IS_ERR(idev))
2493 return idev;
2494
2495 if (idev->cnf.disable_ipv6)
2496 return ERR_PTR(-EACCES);
2497
2498 /* Add default multicast route */
2499 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2500 addrconf_add_mroute(dev);
2501
2502 return idev;
2503 }
2504
manage_tempaddrs(struct inet6_dev * idev,struct inet6_ifaddr * ifp,__u32 valid_lft,__u32 prefered_lft,bool create,unsigned long now)2505 static void manage_tempaddrs(struct inet6_dev *idev,
2506 struct inet6_ifaddr *ifp,
2507 __u32 valid_lft, __u32 prefered_lft,
2508 bool create, unsigned long now)
2509 {
2510 u32 flags;
2511 struct inet6_ifaddr *ift;
2512
2513 read_lock_bh(&idev->lock);
2514 /* update all temporary addresses in the list */
2515 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2516 int age, max_valid, max_prefered;
2517
2518 if (ifp != ift->ifpub)
2519 continue;
2520
2521 /* RFC 4941 section 3.3:
2522 * If a received option will extend the lifetime of a public
2523 * address, the lifetimes of temporary addresses should
2524 * be extended, subject to the overall constraint that no
2525 * temporary addresses should ever remain "valid" or "preferred"
2526 * for a time longer than (TEMP_VALID_LIFETIME) or
2527 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2528 */
2529 age = (now - ift->cstamp) / HZ;
2530 max_valid = idev->cnf.temp_valid_lft - age;
2531 if (max_valid < 0)
2532 max_valid = 0;
2533
2534 max_prefered = idev->cnf.temp_prefered_lft -
2535 idev->desync_factor - age;
2536 if (max_prefered < 0)
2537 max_prefered = 0;
2538
2539 if (valid_lft > max_valid)
2540 valid_lft = max_valid;
2541
2542 if (prefered_lft > max_prefered)
2543 prefered_lft = max_prefered;
2544
2545 spin_lock(&ift->lock);
2546 flags = ift->flags;
2547 ift->valid_lft = valid_lft;
2548 ift->prefered_lft = prefered_lft;
2549 ift->tstamp = now;
2550 if (prefered_lft > 0)
2551 ift->flags &= ~IFA_F_DEPRECATED;
2552
2553 spin_unlock(&ift->lock);
2554 if (!(flags&IFA_F_TENTATIVE))
2555 ipv6_ifa_notify(0, ift);
2556 }
2557
2558 /* Also create a temporary address if it's enabled but no temporary
2559 * address currently exists.
2560 * However, we get called with valid_lft == 0, prefered_lft == 0, create == false
2561 * as part of cleanup (ie. deleting the mngtmpaddr).
2562 * We don't want that to result in creating a new temporary ip address.
2563 */
2564 if (list_empty(&idev->tempaddr_list) && (valid_lft || prefered_lft))
2565 create = true;
2566
2567 if (create && idev->cnf.use_tempaddr > 0) {
2568 /* When a new public address is created as described
2569 * in [ADDRCONF], also create a new temporary address.
2570 */
2571 read_unlock_bh(&idev->lock);
2572 ipv6_create_tempaddr(ifp, false);
2573 } else {
2574 read_unlock_bh(&idev->lock);
2575 }
2576 }
2577
is_addr_mode_generate_stable(struct inet6_dev * idev)2578 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2579 {
2580 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2581 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2582 }
2583
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)2584 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2585 const struct prefix_info *pinfo,
2586 struct inet6_dev *in6_dev,
2587 const struct in6_addr *addr, int addr_type,
2588 u32 addr_flags, bool sllao, bool tokenized,
2589 __u32 valid_lft, u32 prefered_lft)
2590 {
2591 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2592 int create = 0, update_lft = 0;
2593
2594 if (!ifp && valid_lft) {
2595 int max_addresses = in6_dev->cnf.max_addresses;
2596 struct ifa6_config cfg = {
2597 .pfx = addr,
2598 .plen = pinfo->prefix_len,
2599 .ifa_flags = addr_flags,
2600 .valid_lft = valid_lft,
2601 .preferred_lft = prefered_lft,
2602 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2603 };
2604
2605 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2606 if ((net->ipv6.devconf_all->optimistic_dad ||
2607 in6_dev->cnf.optimistic_dad) &&
2608 !net->ipv6.devconf_all->forwarding && sllao)
2609 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2610 #endif
2611
2612 /* Do not allow to create too much of autoconfigured
2613 * addresses; this would be too easy way to crash kernel.
2614 */
2615 if (!max_addresses ||
2616 ipv6_count_addresses(in6_dev) < max_addresses)
2617 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2618
2619 if (IS_ERR_OR_NULL(ifp))
2620 return -1;
2621
2622 create = 1;
2623 spin_lock_bh(&ifp->lock);
2624 ifp->flags |= IFA_F_MANAGETEMPADDR;
2625 ifp->cstamp = jiffies;
2626 ifp->tokenized = tokenized;
2627 spin_unlock_bh(&ifp->lock);
2628 addrconf_dad_start(ifp);
2629 }
2630
2631 if (ifp) {
2632 u32 flags;
2633 unsigned long now;
2634 u32 stored_lft;
2635
2636 /* update lifetime (RFC2462 5.5.3 e) */
2637 spin_lock_bh(&ifp->lock);
2638 now = jiffies;
2639 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2640 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2641 else
2642 stored_lft = 0;
2643 if (!create && stored_lft) {
2644 const u32 minimum_lft = min_t(u32,
2645 stored_lft, MIN_VALID_LIFETIME);
2646 valid_lft = max(valid_lft, minimum_lft);
2647
2648 /* RFC4862 Section 5.5.3e:
2649 * "Note that the preferred lifetime of the
2650 * corresponding address is always reset to
2651 * the Preferred Lifetime in the received
2652 * Prefix Information option, regardless of
2653 * whether the valid lifetime is also reset or
2654 * ignored."
2655 *
2656 * So we should always update prefered_lft here.
2657 */
2658 update_lft = 1;
2659 }
2660
2661 if (update_lft) {
2662 ifp->valid_lft = valid_lft;
2663 ifp->prefered_lft = prefered_lft;
2664 ifp->tstamp = now;
2665 flags = ifp->flags;
2666 ifp->flags &= ~IFA_F_DEPRECATED;
2667 spin_unlock_bh(&ifp->lock);
2668
2669 if (!(flags&IFA_F_TENTATIVE))
2670 ipv6_ifa_notify(0, ifp);
2671 } else
2672 spin_unlock_bh(&ifp->lock);
2673
2674 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2675 create, now);
2676
2677 in6_ifa_put(ifp);
2678 addrconf_verify();
2679 }
2680
2681 return 0;
2682 }
2683 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2684
addrconf_prefix_rcv(struct net_device * dev,u8 * opt,int len,bool sllao)2685 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2686 {
2687 struct prefix_info *pinfo;
2688 __u32 valid_lft;
2689 __u32 prefered_lft;
2690 int addr_type, err;
2691 u32 addr_flags = 0;
2692 struct inet6_dev *in6_dev;
2693 struct net *net = dev_net(dev);
2694
2695 pinfo = (struct prefix_info *) opt;
2696
2697 if (len < sizeof(struct prefix_info)) {
2698 netdev_dbg(dev, "addrconf: prefix option too short\n");
2699 return;
2700 }
2701
2702 /*
2703 * Validation checks ([ADDRCONF], page 19)
2704 */
2705
2706 addr_type = ipv6_addr_type(&pinfo->prefix);
2707
2708 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2709 return;
2710
2711 valid_lft = ntohl(pinfo->valid);
2712 prefered_lft = ntohl(pinfo->prefered);
2713
2714 if (prefered_lft > valid_lft) {
2715 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2716 return;
2717 }
2718
2719 in6_dev = in6_dev_get(dev);
2720
2721 if (!in6_dev) {
2722 net_dbg_ratelimited("addrconf: device %s not configured\n",
2723 dev->name);
2724 return;
2725 }
2726
2727 /*
2728 * Two things going on here:
2729 * 1) Add routes for on-link prefixes
2730 * 2) Configure prefixes with the auto flag set
2731 */
2732
2733 if (pinfo->onlink) {
2734 struct fib6_info *rt;
2735 unsigned long rt_expires;
2736
2737 /* Avoid arithmetic overflow. Really, we could
2738 * save rt_expires in seconds, likely valid_lft,
2739 * but it would require division in fib gc, that it
2740 * not good.
2741 */
2742 if (HZ > USER_HZ)
2743 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2744 else
2745 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2746
2747 if (addrconf_finite_timeout(rt_expires))
2748 rt_expires *= HZ;
2749
2750 rt = addrconf_get_prefix_route(&pinfo->prefix,
2751 pinfo->prefix_len,
2752 dev,
2753 RTF_ADDRCONF | RTF_PREFIX_RT,
2754 RTF_DEFAULT, true);
2755
2756 if (rt) {
2757 /* Autoconf prefix route */
2758 if (valid_lft == 0) {
2759 ip6_del_rt(net, rt, false);
2760 rt = NULL;
2761 } else if (addrconf_finite_timeout(rt_expires)) {
2762 /* not infinity */
2763 fib6_set_expires(rt, jiffies + rt_expires);
2764 } else {
2765 fib6_clean_expires(rt);
2766 }
2767 } else if (valid_lft) {
2768 clock_t expires = 0;
2769 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2770 if (addrconf_finite_timeout(rt_expires)) {
2771 /* not infinity */
2772 flags |= RTF_EXPIRES;
2773 expires = jiffies_to_clock_t(rt_expires);
2774 }
2775 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2776 0, dev, expires, flags,
2777 GFP_ATOMIC);
2778 }
2779 fib6_info_release(rt);
2780 }
2781
2782 /* Try to figure out our local address for this prefix */
2783
2784 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2785 struct in6_addr addr;
2786 bool tokenized = false, dev_addr_generated = false;
2787
2788 if (pinfo->prefix_len == 64) {
2789 memcpy(&addr, &pinfo->prefix, 8);
2790
2791 if (!ipv6_addr_any(&in6_dev->token)) {
2792 read_lock_bh(&in6_dev->lock);
2793 memcpy(addr.s6_addr + 8,
2794 in6_dev->token.s6_addr + 8, 8);
2795 read_unlock_bh(&in6_dev->lock);
2796 tokenized = true;
2797 } else if (is_addr_mode_generate_stable(in6_dev) &&
2798 !ipv6_generate_stable_address(&addr, 0,
2799 in6_dev)) {
2800 addr_flags |= IFA_F_STABLE_PRIVACY;
2801 goto ok;
2802 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2803 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2804 goto put;
2805 } else {
2806 dev_addr_generated = true;
2807 }
2808 goto ok;
2809 }
2810 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2811 pinfo->prefix_len);
2812 goto put;
2813
2814 ok:
2815 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2816 &addr, addr_type,
2817 addr_flags, sllao,
2818 tokenized, valid_lft,
2819 prefered_lft);
2820 if (err)
2821 goto put;
2822
2823 /* Ignore error case here because previous prefix add addr was
2824 * successful which will be notified.
2825 */
2826 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2827 addr_type, addr_flags, sllao,
2828 tokenized, valid_lft,
2829 prefered_lft,
2830 dev_addr_generated);
2831 }
2832 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2833 put:
2834 in6_dev_put(in6_dev);
2835 }
2836
addrconf_set_sit_dstaddr(struct net * net,struct net_device * dev,struct in6_ifreq * ireq)2837 static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2838 struct in6_ifreq *ireq)
2839 {
2840 struct ip_tunnel_parm p = { };
2841 int err;
2842
2843 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2844 return -EADDRNOTAVAIL;
2845
2846 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2847 p.iph.version = 4;
2848 p.iph.ihl = 5;
2849 p.iph.protocol = IPPROTO_IPV6;
2850 p.iph.ttl = 64;
2851
2852 if (!dev->netdev_ops->ndo_tunnel_ctl)
2853 return -EOPNOTSUPP;
2854 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2855 if (err)
2856 return err;
2857
2858 dev = __dev_get_by_name(net, p.name);
2859 if (!dev)
2860 return -ENOBUFS;
2861 return dev_open(dev, NULL);
2862 }
2863
2864 /*
2865 * Set destination address.
2866 * Special case for SIT interfaces where we create a new "virtual"
2867 * device.
2868 */
addrconf_set_dstaddr(struct net * net,void __user * arg)2869 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2870 {
2871 struct net_device *dev;
2872 struct in6_ifreq ireq;
2873 int err = -ENODEV;
2874
2875 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2876 return -ENODEV;
2877 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2878 return -EFAULT;
2879
2880 rtnl_lock();
2881 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2882 if (dev && dev->type == ARPHRD_SIT)
2883 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2884 rtnl_unlock();
2885 return err;
2886 }
2887
ipv6_mc_config(struct sock * sk,bool join,const struct in6_addr * addr,int ifindex)2888 static int ipv6_mc_config(struct sock *sk, bool join,
2889 const struct in6_addr *addr, int ifindex)
2890 {
2891 int ret;
2892
2893 ASSERT_RTNL();
2894
2895 lock_sock(sk);
2896 if (join)
2897 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2898 else
2899 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2900 release_sock(sk);
2901
2902 return ret;
2903 }
2904
2905 /*
2906 * Manual configuration of address on an interface
2907 */
inet6_addr_add(struct net * net,int ifindex,struct ifa6_config * cfg,struct netlink_ext_ack * extack)2908 static int inet6_addr_add(struct net *net, int ifindex,
2909 struct ifa6_config *cfg,
2910 struct netlink_ext_ack *extack)
2911 {
2912 struct inet6_ifaddr *ifp;
2913 struct inet6_dev *idev;
2914 struct net_device *dev;
2915 unsigned long timeout;
2916 clock_t expires;
2917 u32 flags;
2918
2919 ASSERT_RTNL();
2920
2921 if (cfg->plen > 128)
2922 return -EINVAL;
2923
2924 /* check the lifetime */
2925 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2926 return -EINVAL;
2927
2928 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2929 return -EINVAL;
2930
2931 dev = __dev_get_by_index(net, ifindex);
2932 if (!dev)
2933 return -ENODEV;
2934
2935 idev = addrconf_add_dev(dev);
2936 if (IS_ERR(idev))
2937 return PTR_ERR(idev);
2938
2939 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2940 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2941 true, cfg->pfx, ifindex);
2942
2943 if (ret < 0)
2944 return ret;
2945 }
2946
2947 cfg->scope = ipv6_addr_scope(cfg->pfx);
2948
2949 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2950 if (addrconf_finite_timeout(timeout)) {
2951 expires = jiffies_to_clock_t(timeout * HZ);
2952 cfg->valid_lft = timeout;
2953 flags = RTF_EXPIRES;
2954 } else {
2955 expires = 0;
2956 flags = 0;
2957 cfg->ifa_flags |= IFA_F_PERMANENT;
2958 }
2959
2960 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2961 if (addrconf_finite_timeout(timeout)) {
2962 if (timeout == 0)
2963 cfg->ifa_flags |= IFA_F_DEPRECATED;
2964 cfg->preferred_lft = timeout;
2965 }
2966
2967 ifp = ipv6_add_addr(idev, cfg, true, extack);
2968 if (!IS_ERR(ifp)) {
2969 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2970 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2971 ifp->rt_priority, dev, expires,
2972 flags, GFP_KERNEL);
2973 }
2974
2975 /* Send a netlink notification if DAD is enabled and
2976 * optimistic flag is not set
2977 */
2978 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2979 ipv6_ifa_notify(0, ifp);
2980 /*
2981 * Note that section 3.1 of RFC 4429 indicates
2982 * that the Optimistic flag should not be set for
2983 * manually configured addresses
2984 */
2985 addrconf_dad_start(ifp);
2986 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2987 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2988 cfg->preferred_lft, true, jiffies);
2989 in6_ifa_put(ifp);
2990 addrconf_verify_rtnl();
2991 return 0;
2992 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2993 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2994 cfg->pfx, ifindex);
2995 }
2996
2997 return PTR_ERR(ifp);
2998 }
2999
inet6_addr_del(struct net * net,int ifindex,u32 ifa_flags,const struct in6_addr * pfx,unsigned int plen)3000 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
3001 const struct in6_addr *pfx, unsigned int plen)
3002 {
3003 struct inet6_ifaddr *ifp;
3004 struct inet6_dev *idev;
3005 struct net_device *dev;
3006
3007 if (plen > 128)
3008 return -EINVAL;
3009
3010 dev = __dev_get_by_index(net, ifindex);
3011 if (!dev)
3012 return -ENODEV;
3013
3014 idev = __in6_dev_get(dev);
3015 if (!idev)
3016 return -ENXIO;
3017
3018 read_lock_bh(&idev->lock);
3019 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3020 if (ifp->prefix_len == plen &&
3021 ipv6_addr_equal(pfx, &ifp->addr)) {
3022 in6_ifa_hold(ifp);
3023 read_unlock_bh(&idev->lock);
3024
3025 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3026 (ifa_flags & IFA_F_MANAGETEMPADDR))
3027 manage_tempaddrs(idev, ifp, 0, 0, false,
3028 jiffies);
3029 ipv6_del_addr(ifp);
3030 addrconf_verify_rtnl();
3031 if (ipv6_addr_is_multicast(pfx)) {
3032 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3033 false, pfx, dev->ifindex);
3034 }
3035 return 0;
3036 }
3037 }
3038 read_unlock_bh(&idev->lock);
3039 return -EADDRNOTAVAIL;
3040 }
3041
3042
addrconf_add_ifaddr(struct net * net,void __user * arg)3043 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3044 {
3045 struct ifa6_config cfg = {
3046 .ifa_flags = IFA_F_PERMANENT,
3047 .preferred_lft = INFINITY_LIFE_TIME,
3048 .valid_lft = INFINITY_LIFE_TIME,
3049 };
3050 struct in6_ifreq ireq;
3051 int err;
3052
3053 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3054 return -EPERM;
3055
3056 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3057 return -EFAULT;
3058
3059 cfg.pfx = &ireq.ifr6_addr;
3060 cfg.plen = ireq.ifr6_prefixlen;
3061
3062 rtnl_lock();
3063 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3064 rtnl_unlock();
3065 return err;
3066 }
3067
addrconf_del_ifaddr(struct net * net,void __user * arg)3068 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3069 {
3070 struct in6_ifreq ireq;
3071 int err;
3072
3073 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3074 return -EPERM;
3075
3076 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3077 return -EFAULT;
3078
3079 rtnl_lock();
3080 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3081 ireq.ifr6_prefixlen);
3082 rtnl_unlock();
3083 return err;
3084 }
3085
add_addr(struct inet6_dev * idev,const struct in6_addr * addr,int plen,int scope)3086 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3087 int plen, int scope)
3088 {
3089 struct inet6_ifaddr *ifp;
3090 struct ifa6_config cfg = {
3091 .pfx = addr,
3092 .plen = plen,
3093 .ifa_flags = IFA_F_PERMANENT,
3094 .valid_lft = INFINITY_LIFE_TIME,
3095 .preferred_lft = INFINITY_LIFE_TIME,
3096 .scope = scope
3097 };
3098
3099 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3100 if (!IS_ERR(ifp)) {
3101 spin_lock_bh(&ifp->lock);
3102 ifp->flags &= ~IFA_F_TENTATIVE;
3103 spin_unlock_bh(&ifp->lock);
3104 rt_genid_bump_ipv6(dev_net(idev->dev));
3105 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3106 in6_ifa_put(ifp);
3107 }
3108 }
3109
3110 #if IS_ENABLED(CONFIG_IPV6_SIT)
sit_add_v4_addrs(struct inet6_dev * idev)3111 static void sit_add_v4_addrs(struct inet6_dev *idev)
3112 {
3113 struct in6_addr addr;
3114 struct net_device *dev;
3115 struct net *net = dev_net(idev->dev);
3116 int scope, plen;
3117 u32 pflags = 0;
3118
3119 ASSERT_RTNL();
3120
3121 memset(&addr, 0, sizeof(struct in6_addr));
3122 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3123
3124 if (idev->dev->flags&IFF_POINTOPOINT) {
3125 if (idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_NONE)
3126 return;
3127
3128 addr.s6_addr32[0] = htonl(0xfe800000);
3129 scope = IFA_LINK;
3130 plen = 64;
3131 } else {
3132 scope = IPV6_ADDR_COMPATv4;
3133 plen = 96;
3134 pflags |= RTF_NONEXTHOP;
3135 }
3136
3137 if (addr.s6_addr32[3]) {
3138 add_addr(idev, &addr, plen, scope);
3139 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3140 GFP_KERNEL);
3141 return;
3142 }
3143
3144 for_each_netdev(net, dev) {
3145 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3146 if (in_dev && (dev->flags & IFF_UP)) {
3147 struct in_ifaddr *ifa;
3148 int flag = scope;
3149
3150 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3151 addr.s6_addr32[3] = ifa->ifa_local;
3152
3153 if (ifa->ifa_scope == RT_SCOPE_LINK)
3154 continue;
3155 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3156 if (idev->dev->flags&IFF_POINTOPOINT)
3157 continue;
3158 flag |= IFA_HOST;
3159 }
3160
3161 add_addr(idev, &addr, plen, flag);
3162 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3163 0, pflags, GFP_KERNEL);
3164 }
3165 }
3166 }
3167 }
3168 #endif
3169
init_loopback(struct net_device * dev)3170 static void init_loopback(struct net_device *dev)
3171 {
3172 struct inet6_dev *idev;
3173
3174 /* ::1 */
3175
3176 ASSERT_RTNL();
3177
3178 idev = ipv6_find_idev(dev);
3179 if (IS_ERR(idev)) {
3180 pr_debug("%s: add_dev failed\n", __func__);
3181 return;
3182 }
3183
3184 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3185 }
3186
addrconf_add_linklocal(struct inet6_dev * idev,const struct in6_addr * addr,u32 flags)3187 void addrconf_add_linklocal(struct inet6_dev *idev,
3188 const struct in6_addr *addr, u32 flags)
3189 {
3190 struct ifa6_config cfg = {
3191 .pfx = addr,
3192 .plen = 64,
3193 .ifa_flags = flags | IFA_F_PERMANENT,
3194 .valid_lft = INFINITY_LIFE_TIME,
3195 .preferred_lft = INFINITY_LIFE_TIME,
3196 .scope = IFA_LINK
3197 };
3198 struct inet6_ifaddr *ifp;
3199
3200 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3201 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3202 idev->cnf.optimistic_dad) &&
3203 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3204 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3205 #endif
3206
3207 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3208 if (!IS_ERR(ifp)) {
3209 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3210 0, 0, GFP_ATOMIC);
3211 addrconf_dad_start(ifp);
3212 in6_ifa_put(ifp);
3213 }
3214 }
3215 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3216
ipv6_reserved_interfaceid(struct in6_addr address)3217 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3218 {
3219 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3220 return true;
3221
3222 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3223 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3224 return true;
3225
3226 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3227 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3228 return true;
3229
3230 return false;
3231 }
3232
ipv6_generate_stable_address(struct in6_addr * address,u8 dad_count,const struct inet6_dev * idev)3233 static int ipv6_generate_stable_address(struct in6_addr *address,
3234 u8 dad_count,
3235 const struct inet6_dev *idev)
3236 {
3237 static DEFINE_SPINLOCK(lock);
3238 static __u32 digest[SHA1_DIGEST_WORDS];
3239 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3240
3241 static union {
3242 char __data[SHA1_BLOCK_SIZE];
3243 struct {
3244 struct in6_addr secret;
3245 __be32 prefix[2];
3246 unsigned char hwaddr[MAX_ADDR_LEN];
3247 u8 dad_count;
3248 } __packed;
3249 } data;
3250
3251 struct in6_addr secret;
3252 struct in6_addr temp;
3253 struct net *net = dev_net(idev->dev);
3254
3255 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3256
3257 if (idev->cnf.stable_secret.initialized)
3258 secret = idev->cnf.stable_secret.secret;
3259 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3260 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3261 else
3262 return -1;
3263
3264 retry:
3265 spin_lock_bh(&lock);
3266
3267 sha1_init(digest);
3268 memset(&data, 0, sizeof(data));
3269 memset(workspace, 0, sizeof(workspace));
3270 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3271 data.prefix[0] = address->s6_addr32[0];
3272 data.prefix[1] = address->s6_addr32[1];
3273 data.secret = secret;
3274 data.dad_count = dad_count;
3275
3276 sha1_transform(digest, data.__data, workspace);
3277
3278 temp = *address;
3279 temp.s6_addr32[2] = (__force __be32)digest[0];
3280 temp.s6_addr32[3] = (__force __be32)digest[1];
3281
3282 spin_unlock_bh(&lock);
3283
3284 if (ipv6_reserved_interfaceid(temp)) {
3285 dad_count++;
3286 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3287 return -1;
3288 goto retry;
3289 }
3290
3291 *address = temp;
3292 return 0;
3293 }
3294
ipv6_gen_mode_random_init(struct inet6_dev * idev)3295 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3296 {
3297 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3298
3299 if (s->initialized)
3300 return;
3301 s = &idev->cnf.stable_secret;
3302 get_random_bytes(&s->secret, sizeof(s->secret));
3303 s->initialized = true;
3304 }
3305
addrconf_addr_gen(struct inet6_dev * idev,bool prefix_route)3306 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3307 {
3308 struct in6_addr addr;
3309
3310 /* no link local addresses on L3 master devices */
3311 if (netif_is_l3_master(idev->dev))
3312 return;
3313
3314 /* no link local addresses on devices flagged as slaves */
3315 if (idev->dev->flags & IFF_SLAVE)
3316 return;
3317
3318 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3319
3320 switch (idev->cnf.addr_gen_mode) {
3321 case IN6_ADDR_GEN_MODE_RANDOM:
3322 ipv6_gen_mode_random_init(idev);
3323 fallthrough;
3324 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3325 if (!ipv6_generate_stable_address(&addr, 0, idev))
3326 addrconf_add_linklocal(idev, &addr,
3327 IFA_F_STABLE_PRIVACY);
3328 else if (prefix_route)
3329 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3330 0, 0, GFP_KERNEL);
3331 break;
3332 case IN6_ADDR_GEN_MODE_EUI64:
3333 /* addrconf_add_linklocal also adds a prefix_route and we
3334 * only need to care about prefix routes if ipv6_generate_eui64
3335 * couldn't generate one.
3336 */
3337 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3338 addrconf_add_linklocal(idev, &addr, 0);
3339 else if (prefix_route)
3340 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3341 0, 0, GFP_KERNEL);
3342 break;
3343 case IN6_ADDR_GEN_MODE_NONE:
3344 default:
3345 /* will not add any link local address */
3346 break;
3347 }
3348 }
3349
addrconf_dev_config(struct net_device * dev)3350 static void addrconf_dev_config(struct net_device *dev)
3351 {
3352 struct inet6_dev *idev;
3353
3354 ASSERT_RTNL();
3355
3356 if ((dev->type != ARPHRD_ETHER) &&
3357 (dev->type != ARPHRD_FDDI) &&
3358 (dev->type != ARPHRD_ARCNET) &&
3359 (dev->type != ARPHRD_INFINIBAND) &&
3360 (dev->type != ARPHRD_IEEE1394) &&
3361 (dev->type != ARPHRD_TUNNEL6) &&
3362 (dev->type != ARPHRD_6LOWPAN) &&
3363 (dev->type != ARPHRD_IP6GRE) &&
3364 (dev->type != ARPHRD_IPGRE) &&
3365 (dev->type != ARPHRD_TUNNEL) &&
3366 (dev->type != ARPHRD_NONE) &&
3367 (dev->type != ARPHRD_RAWIP)) {
3368 /* Alas, we support only Ethernet autoconfiguration. */
3369 idev = __in6_dev_get(dev);
3370 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3371 dev->flags & IFF_MULTICAST)
3372 ipv6_mc_up(idev);
3373 return;
3374 }
3375
3376 idev = addrconf_add_dev(dev);
3377 if (IS_ERR(idev))
3378 return;
3379
3380 /* this device type has no EUI support */
3381 if (dev->type == ARPHRD_NONE &&
3382 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3383 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3384
3385 addrconf_addr_gen(idev, false);
3386 }
3387
3388 #if IS_ENABLED(CONFIG_IPV6_SIT)
addrconf_sit_config(struct net_device * dev)3389 static void addrconf_sit_config(struct net_device *dev)
3390 {
3391 struct inet6_dev *idev;
3392
3393 ASSERT_RTNL();
3394
3395 /*
3396 * Configure the tunnel with one of our IPv4
3397 * addresses... we should configure all of
3398 * our v4 addrs in the tunnel
3399 */
3400
3401 idev = ipv6_find_idev(dev);
3402 if (IS_ERR(idev)) {
3403 pr_debug("%s: add_dev failed\n", __func__);
3404 return;
3405 }
3406
3407 if (dev->priv_flags & IFF_ISATAP) {
3408 addrconf_addr_gen(idev, false);
3409 return;
3410 }
3411
3412 sit_add_v4_addrs(idev);
3413
3414 if (dev->flags&IFF_POINTOPOINT)
3415 addrconf_add_mroute(dev);
3416 }
3417 #endif
3418
3419 #if IS_ENABLED(CONFIG_NET_IPGRE)
addrconf_gre_config(struct net_device * dev)3420 static void addrconf_gre_config(struct net_device *dev)
3421 {
3422 struct inet6_dev *idev;
3423
3424 ASSERT_RTNL();
3425
3426 idev = ipv6_find_idev(dev);
3427 if (IS_ERR(idev)) {
3428 pr_debug("%s: add_dev failed\n", __func__);
3429 return;
3430 }
3431
3432 addrconf_addr_gen(idev, true);
3433 if (dev->flags & IFF_POINTOPOINT)
3434 addrconf_add_mroute(dev);
3435 }
3436 #endif
3437
fixup_permanent_addr(struct net * net,struct inet6_dev * idev,struct inet6_ifaddr * ifp)3438 static int fixup_permanent_addr(struct net *net,
3439 struct inet6_dev *idev,
3440 struct inet6_ifaddr *ifp)
3441 {
3442 /* !fib6_node means the host route was removed from the
3443 * FIB, for example, if 'lo' device is taken down. In that
3444 * case regenerate the host route.
3445 */
3446 if (!ifp->rt || !ifp->rt->fib6_node) {
3447 struct fib6_info *f6i, *prev;
3448
3449 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3450 GFP_ATOMIC);
3451 if (IS_ERR(f6i))
3452 return PTR_ERR(f6i);
3453
3454 /* ifp->rt can be accessed outside of rtnl */
3455 spin_lock(&ifp->lock);
3456 prev = ifp->rt;
3457 ifp->rt = f6i;
3458 spin_unlock(&ifp->lock);
3459
3460 fib6_info_release(prev);
3461 }
3462
3463 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3464 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3465 ifp->rt_priority, idev->dev, 0, 0,
3466 GFP_ATOMIC);
3467 }
3468
3469 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3470 addrconf_dad_start(ifp);
3471
3472 return 0;
3473 }
3474
addrconf_permanent_addr(struct net * net,struct net_device * dev)3475 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3476 {
3477 struct inet6_ifaddr *ifp, *tmp;
3478 struct inet6_dev *idev;
3479
3480 idev = __in6_dev_get(dev);
3481 if (!idev)
3482 return;
3483
3484 write_lock_bh(&idev->lock);
3485
3486 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3487 if ((ifp->flags & IFA_F_PERMANENT) &&
3488 fixup_permanent_addr(net, idev, ifp) < 0) {
3489 write_unlock_bh(&idev->lock);
3490 in6_ifa_hold(ifp);
3491 ipv6_del_addr(ifp);
3492 write_lock_bh(&idev->lock);
3493
3494 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3495 idev->dev->name, &ifp->addr);
3496 }
3497 }
3498
3499 write_unlock_bh(&idev->lock);
3500 }
3501
addrconf_notify(struct notifier_block * this,unsigned long event,void * ptr)3502 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3503 void *ptr)
3504 {
3505 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3506 struct netdev_notifier_change_info *change_info;
3507 struct netdev_notifier_changeupper_info *info;
3508 struct inet6_dev *idev = __in6_dev_get(dev);
3509 struct net *net = dev_net(dev);
3510 int run_pending = 0;
3511 int err;
3512
3513 switch (event) {
3514 case NETDEV_REGISTER:
3515 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3516 idev = ipv6_add_dev(dev);
3517 if (IS_ERR(idev))
3518 return notifier_from_errno(PTR_ERR(idev));
3519 }
3520 break;
3521
3522 case NETDEV_CHANGEMTU:
3523 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3524 if (dev->mtu < IPV6_MIN_MTU) {
3525 addrconf_ifdown(dev, dev != net->loopback_dev);
3526 break;
3527 }
3528
3529 if (idev) {
3530 rt6_mtu_change(dev, dev->mtu);
3531 idev->cnf.mtu6 = dev->mtu;
3532 break;
3533 }
3534
3535 /* allocate new idev */
3536 idev = ipv6_add_dev(dev);
3537 if (IS_ERR(idev))
3538 break;
3539
3540 /* device is still not ready */
3541 if (!(idev->if_flags & IF_READY))
3542 break;
3543
3544 run_pending = 1;
3545 fallthrough;
3546 case NETDEV_UP:
3547 case NETDEV_CHANGE:
3548 if (dev->flags & IFF_SLAVE)
3549 break;
3550
3551 if (idev && idev->cnf.disable_ipv6)
3552 break;
3553
3554 if (event == NETDEV_UP) {
3555 /* restore routes for permanent addresses */
3556 addrconf_permanent_addr(net, dev);
3557
3558 if (!addrconf_link_ready(dev)) {
3559 /* device is not ready yet. */
3560 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3561 dev->name);
3562 break;
3563 }
3564
3565 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3566 idev = ipv6_add_dev(dev);
3567
3568 if (!IS_ERR_OR_NULL(idev)) {
3569 idev->if_flags |= IF_READY;
3570 run_pending = 1;
3571 }
3572 } else if (event == NETDEV_CHANGE) {
3573 if (!addrconf_link_ready(dev)) {
3574 /* device is still not ready. */
3575 rt6_sync_down_dev(dev, event);
3576 break;
3577 }
3578
3579 if (!IS_ERR_OR_NULL(idev)) {
3580 if (idev->if_flags & IF_READY) {
3581 /* device is already configured -
3582 * but resend MLD reports, we might
3583 * have roamed and need to update
3584 * multicast snooping switches
3585 */
3586 ipv6_mc_up(idev);
3587 change_info = ptr;
3588 if (change_info->flags_changed & IFF_NOARP)
3589 addrconf_dad_run(idev, true);
3590 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3591 break;
3592 }
3593 idev->if_flags |= IF_READY;
3594 }
3595
3596 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3597 dev->name);
3598
3599 run_pending = 1;
3600 }
3601
3602 switch (dev->type) {
3603 #if IS_ENABLED(CONFIG_IPV6_SIT)
3604 case ARPHRD_SIT:
3605 addrconf_sit_config(dev);
3606 break;
3607 #endif
3608 #if IS_ENABLED(CONFIG_NET_IPGRE)
3609 case ARPHRD_IPGRE:
3610 addrconf_gre_config(dev);
3611 break;
3612 #endif
3613 case ARPHRD_LOOPBACK:
3614 init_loopback(dev);
3615 break;
3616
3617 default:
3618 addrconf_dev_config(dev);
3619 break;
3620 }
3621
3622 if (!IS_ERR_OR_NULL(idev)) {
3623 if (run_pending)
3624 addrconf_dad_run(idev, false);
3625
3626 /* Device has an address by now */
3627 rt6_sync_up(dev, RTNH_F_DEAD);
3628
3629 /*
3630 * If the MTU changed during the interface down,
3631 * when the interface up, the changed MTU must be
3632 * reflected in the idev as well as routers.
3633 */
3634 if (idev->cnf.mtu6 != dev->mtu &&
3635 dev->mtu >= IPV6_MIN_MTU) {
3636 rt6_mtu_change(dev, dev->mtu);
3637 idev->cnf.mtu6 = dev->mtu;
3638 }
3639 idev->tstamp = jiffies;
3640 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3641
3642 /*
3643 * If the changed mtu during down is lower than
3644 * IPV6_MIN_MTU stop IPv6 on this interface.
3645 */
3646 if (dev->mtu < IPV6_MIN_MTU)
3647 addrconf_ifdown(dev, dev != net->loopback_dev);
3648 }
3649 break;
3650
3651 case NETDEV_DOWN:
3652 case NETDEV_UNREGISTER:
3653 /*
3654 * Remove all addresses from this interface.
3655 */
3656 addrconf_ifdown(dev, event != NETDEV_DOWN);
3657 break;
3658
3659 case NETDEV_CHANGENAME:
3660 if (idev) {
3661 snmp6_unregister_dev(idev);
3662 addrconf_sysctl_unregister(idev);
3663 err = addrconf_sysctl_register(idev);
3664 if (err)
3665 return notifier_from_errno(err);
3666 err = snmp6_register_dev(idev);
3667 if (err) {
3668 addrconf_sysctl_unregister(idev);
3669 return notifier_from_errno(err);
3670 }
3671 }
3672 break;
3673
3674 case NETDEV_PRE_TYPE_CHANGE:
3675 case NETDEV_POST_TYPE_CHANGE:
3676 if (idev)
3677 addrconf_type_change(dev, event);
3678 break;
3679
3680 case NETDEV_CHANGEUPPER:
3681 info = ptr;
3682
3683 /* flush all routes if dev is linked to or unlinked from
3684 * an L3 master device (e.g., VRF)
3685 */
3686 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3687 addrconf_ifdown(dev, false);
3688 }
3689
3690 return NOTIFY_OK;
3691 }
3692
3693 /*
3694 * addrconf module should be notified of a device going up
3695 */
3696 static struct notifier_block ipv6_dev_notf = {
3697 .notifier_call = addrconf_notify,
3698 .priority = ADDRCONF_NOTIFY_PRIORITY,
3699 };
3700
addrconf_type_change(struct net_device * dev,unsigned long event)3701 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3702 {
3703 struct inet6_dev *idev;
3704 ASSERT_RTNL();
3705
3706 idev = __in6_dev_get(dev);
3707
3708 if (event == NETDEV_POST_TYPE_CHANGE)
3709 ipv6_mc_remap(idev);
3710 else if (event == NETDEV_PRE_TYPE_CHANGE)
3711 ipv6_mc_unmap(idev);
3712 }
3713
addr_is_local(const struct in6_addr * addr)3714 static bool addr_is_local(const struct in6_addr *addr)
3715 {
3716 return ipv6_addr_type(addr) &
3717 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3718 }
3719
addrconf_ifdown(struct net_device * dev,bool unregister)3720 static int addrconf_ifdown(struct net_device *dev, bool unregister)
3721 {
3722 unsigned long event = unregister ? NETDEV_UNREGISTER : NETDEV_DOWN;
3723 struct net *net = dev_net(dev);
3724 struct inet6_dev *idev;
3725 struct inet6_ifaddr *ifa;
3726 LIST_HEAD(tmp_addr_list);
3727 bool keep_addr = false;
3728 bool was_ready;
3729 int state, i;
3730
3731 ASSERT_RTNL();
3732
3733 rt6_disable_ip(dev, event);
3734
3735 idev = __in6_dev_get(dev);
3736 if (!idev)
3737 return -ENODEV;
3738
3739 /*
3740 * Step 1: remove reference to ipv6 device from parent device.
3741 * Do not dev_put!
3742 */
3743 if (unregister) {
3744 idev->dead = 1;
3745
3746 /* protected by rtnl_lock */
3747 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3748
3749 /* Step 1.5: remove snmp6 entry */
3750 snmp6_unregister_dev(idev);
3751
3752 }
3753
3754 /* combine the user config with event to determine if permanent
3755 * addresses are to be removed from address hash table
3756 */
3757 if (!unregister && !idev->cnf.disable_ipv6) {
3758 /* aggregate the system setting and interface setting */
3759 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3760
3761 if (!_keep_addr)
3762 _keep_addr = idev->cnf.keep_addr_on_down;
3763
3764 keep_addr = (_keep_addr > 0);
3765 }
3766
3767 /* Step 2: clear hash table */
3768 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3769 struct hlist_head *h = &inet6_addr_lst[i];
3770
3771 spin_lock_bh(&addrconf_hash_lock);
3772 restart:
3773 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3774 if (ifa->idev == idev) {
3775 addrconf_del_dad_work(ifa);
3776 /* combined flag + permanent flag decide if
3777 * address is retained on a down event
3778 */
3779 if (!keep_addr ||
3780 !(ifa->flags & IFA_F_PERMANENT) ||
3781 addr_is_local(&ifa->addr)) {
3782 hlist_del_init_rcu(&ifa->addr_lst);
3783 goto restart;
3784 }
3785 }
3786 }
3787 spin_unlock_bh(&addrconf_hash_lock);
3788 }
3789
3790 write_lock_bh(&idev->lock);
3791
3792 addrconf_del_rs_timer(idev);
3793
3794 /* Step 2: clear flags for stateless addrconf, repeated down
3795 * detection
3796 */
3797 was_ready = idev->if_flags & IF_READY;
3798 if (!unregister)
3799 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3800
3801 /* Step 3: clear tempaddr list */
3802 while (!list_empty(&idev->tempaddr_list)) {
3803 ifa = list_first_entry(&idev->tempaddr_list,
3804 struct inet6_ifaddr, tmp_list);
3805 list_del(&ifa->tmp_list);
3806 write_unlock_bh(&idev->lock);
3807 spin_lock_bh(&ifa->lock);
3808
3809 if (ifa->ifpub) {
3810 in6_ifa_put(ifa->ifpub);
3811 ifa->ifpub = NULL;
3812 }
3813 spin_unlock_bh(&ifa->lock);
3814 in6_ifa_put(ifa);
3815 write_lock_bh(&idev->lock);
3816 }
3817
3818 list_for_each_entry(ifa, &idev->addr_list, if_list)
3819 list_add_tail(&ifa->if_list_aux, &tmp_addr_list);
3820 write_unlock_bh(&idev->lock);
3821
3822 while (!list_empty(&tmp_addr_list)) {
3823 struct fib6_info *rt = NULL;
3824 bool keep;
3825
3826 ifa = list_first_entry(&tmp_addr_list,
3827 struct inet6_ifaddr, if_list_aux);
3828 list_del(&ifa->if_list_aux);
3829
3830 addrconf_del_dad_work(ifa);
3831
3832 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3833 !addr_is_local(&ifa->addr);
3834
3835 spin_lock_bh(&ifa->lock);
3836
3837 if (keep) {
3838 /* set state to skip the notifier below */
3839 state = INET6_IFADDR_STATE_DEAD;
3840 ifa->state = INET6_IFADDR_STATE_PREDAD;
3841 if (!(ifa->flags & IFA_F_NODAD))
3842 ifa->flags |= IFA_F_TENTATIVE;
3843
3844 rt = ifa->rt;
3845 ifa->rt = NULL;
3846 } else {
3847 state = ifa->state;
3848 ifa->state = INET6_IFADDR_STATE_DEAD;
3849 }
3850
3851 spin_unlock_bh(&ifa->lock);
3852
3853 if (rt)
3854 ip6_del_rt(net, rt, false);
3855
3856 if (state != INET6_IFADDR_STATE_DEAD) {
3857 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3858 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3859 } else {
3860 if (idev->cnf.forwarding)
3861 addrconf_leave_anycast(ifa);
3862 addrconf_leave_solict(ifa->idev, &ifa->addr);
3863 }
3864
3865 if (!keep) {
3866 write_lock_bh(&idev->lock);
3867 list_del_rcu(&ifa->if_list);
3868 write_unlock_bh(&idev->lock);
3869 in6_ifa_put(ifa);
3870 }
3871 }
3872
3873 /* Step 5: Discard anycast and multicast list */
3874 if (unregister) {
3875 ipv6_ac_destroy_dev(idev);
3876 ipv6_mc_destroy_dev(idev);
3877 } else if (was_ready) {
3878 ipv6_mc_down(idev);
3879 }
3880
3881 idev->tstamp = jiffies;
3882
3883 /* Last: Shot the device (if unregistered) */
3884 if (unregister) {
3885 addrconf_sysctl_unregister(idev);
3886 neigh_parms_release(&nd_tbl, idev->nd_parms);
3887 neigh_ifdown(&nd_tbl, dev);
3888 in6_dev_put(idev);
3889 }
3890 return 0;
3891 }
3892
addrconf_rs_timer(struct timer_list * t)3893 static void addrconf_rs_timer(struct timer_list *t)
3894 {
3895 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3896 struct net_device *dev = idev->dev;
3897 struct in6_addr lladdr;
3898
3899 write_lock(&idev->lock);
3900 if (idev->dead || !(idev->if_flags & IF_READY))
3901 goto out;
3902
3903 if (!ipv6_accept_ra(idev))
3904 goto out;
3905
3906 /* Announcement received after solicitation was sent */
3907 if (idev->if_flags & IF_RA_RCVD)
3908 goto out;
3909
3910 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3911 write_unlock(&idev->lock);
3912 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3913 ndisc_send_rs(dev, &lladdr,
3914 &in6addr_linklocal_allrouters);
3915 else
3916 goto put;
3917
3918 write_lock(&idev->lock);
3919 idev->rs_interval = rfc3315_s14_backoff_update(
3920 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3921 /* The wait after the last probe can be shorter */
3922 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3923 idev->cnf.rtr_solicits) ?
3924 idev->cnf.rtr_solicit_delay :
3925 idev->rs_interval);
3926 } else {
3927 /*
3928 * Note: we do not support deprecated "all on-link"
3929 * assumption any longer.
3930 */
3931 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3932 }
3933
3934 out:
3935 write_unlock(&idev->lock);
3936 put:
3937 in6_dev_put(idev);
3938 }
3939
3940 /*
3941 * Duplicate Address Detection
3942 */
addrconf_dad_kick(struct inet6_ifaddr * ifp)3943 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3944 {
3945 unsigned long rand_num;
3946 struct inet6_dev *idev = ifp->idev;
3947 u64 nonce;
3948
3949 if (ifp->flags & IFA_F_OPTIMISTIC)
3950 rand_num = 0;
3951 else
3952 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3953
3954 nonce = 0;
3955 if (idev->cnf.enhanced_dad ||
3956 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3957 do
3958 get_random_bytes(&nonce, 6);
3959 while (nonce == 0);
3960 }
3961 ifp->dad_nonce = nonce;
3962 ifp->dad_probes = idev->cnf.dad_transmits;
3963 addrconf_mod_dad_work(ifp, rand_num);
3964 }
3965
addrconf_dad_begin(struct inet6_ifaddr * ifp)3966 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3967 {
3968 struct inet6_dev *idev = ifp->idev;
3969 struct net_device *dev = idev->dev;
3970 bool bump_id, notify = false;
3971 struct net *net;
3972
3973 addrconf_join_solict(dev, &ifp->addr);
3974
3975 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3976
3977 read_lock_bh(&idev->lock);
3978 spin_lock(&ifp->lock);
3979 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3980 goto out;
3981
3982 net = dev_net(dev);
3983 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3984 (net->ipv6.devconf_all->accept_dad < 1 &&
3985 idev->cnf.accept_dad < 1) ||
3986 !(ifp->flags&IFA_F_TENTATIVE) ||
3987 ifp->flags & IFA_F_NODAD) {
3988 bool send_na = false;
3989
3990 if (ifp->flags & IFA_F_TENTATIVE &&
3991 !(ifp->flags & IFA_F_OPTIMISTIC))
3992 send_na = true;
3993 bump_id = ifp->flags & IFA_F_TENTATIVE;
3994 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3995 spin_unlock(&ifp->lock);
3996 read_unlock_bh(&idev->lock);
3997
3998 addrconf_dad_completed(ifp, bump_id, send_na);
3999 return;
4000 }
4001
4002 if (!(idev->if_flags & IF_READY)) {
4003 spin_unlock(&ifp->lock);
4004 read_unlock_bh(&idev->lock);
4005 /*
4006 * If the device is not ready:
4007 * - keep it tentative if it is a permanent address.
4008 * - otherwise, kill it.
4009 */
4010 in6_ifa_hold(ifp);
4011 addrconf_dad_stop(ifp, 0);
4012 return;
4013 }
4014
4015 /*
4016 * Optimistic nodes can start receiving
4017 * Frames right away
4018 */
4019 if (ifp->flags & IFA_F_OPTIMISTIC) {
4020 ip6_ins_rt(net, ifp->rt);
4021 if (ipv6_use_optimistic_addr(net, idev)) {
4022 /* Because optimistic nodes can use this address,
4023 * notify listeners. If DAD fails, RTM_DELADDR is sent.
4024 */
4025 notify = true;
4026 }
4027 }
4028
4029 addrconf_dad_kick(ifp);
4030 out:
4031 spin_unlock(&ifp->lock);
4032 read_unlock_bh(&idev->lock);
4033 if (notify)
4034 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4035 }
4036
addrconf_dad_start(struct inet6_ifaddr * ifp)4037 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4038 {
4039 bool begin_dad = false;
4040
4041 spin_lock_bh(&ifp->lock);
4042 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4043 ifp->state = INET6_IFADDR_STATE_PREDAD;
4044 begin_dad = true;
4045 }
4046 spin_unlock_bh(&ifp->lock);
4047
4048 if (begin_dad)
4049 addrconf_mod_dad_work(ifp, 0);
4050 }
4051
addrconf_dad_work(struct work_struct * w)4052 static void addrconf_dad_work(struct work_struct *w)
4053 {
4054 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4055 struct inet6_ifaddr,
4056 dad_work);
4057 struct inet6_dev *idev = ifp->idev;
4058 bool bump_id, disable_ipv6 = false;
4059 struct in6_addr mcaddr;
4060
4061 enum {
4062 DAD_PROCESS,
4063 DAD_BEGIN,
4064 DAD_ABORT,
4065 } action = DAD_PROCESS;
4066
4067 rtnl_lock();
4068
4069 spin_lock_bh(&ifp->lock);
4070 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4071 action = DAD_BEGIN;
4072 ifp->state = INET6_IFADDR_STATE_DAD;
4073 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4074 action = DAD_ABORT;
4075 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4076
4077 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4078 idev->cnf.accept_dad > 1) &&
4079 !idev->cnf.disable_ipv6 &&
4080 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4081 struct in6_addr addr;
4082
4083 addr.s6_addr32[0] = htonl(0xfe800000);
4084 addr.s6_addr32[1] = 0;
4085
4086 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4087 ipv6_addr_equal(&ifp->addr, &addr)) {
4088 /* DAD failed for link-local based on MAC */
4089 idev->cnf.disable_ipv6 = 1;
4090
4091 pr_info("%s: IPv6 being disabled!\n",
4092 ifp->idev->dev->name);
4093 disable_ipv6 = true;
4094 }
4095 }
4096 }
4097 spin_unlock_bh(&ifp->lock);
4098
4099 if (action == DAD_BEGIN) {
4100 addrconf_dad_begin(ifp);
4101 goto out;
4102 } else if (action == DAD_ABORT) {
4103 in6_ifa_hold(ifp);
4104 addrconf_dad_stop(ifp, 1);
4105 if (disable_ipv6)
4106 addrconf_ifdown(idev->dev, false);
4107 goto out;
4108 }
4109
4110 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4111 goto out;
4112
4113 write_lock_bh(&idev->lock);
4114 if (idev->dead || !(idev->if_flags & IF_READY)) {
4115 write_unlock_bh(&idev->lock);
4116 goto out;
4117 }
4118
4119 spin_lock(&ifp->lock);
4120 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4121 spin_unlock(&ifp->lock);
4122 write_unlock_bh(&idev->lock);
4123 goto out;
4124 }
4125
4126 if (ifp->dad_probes == 0) {
4127 bool send_na = false;
4128
4129 /*
4130 * DAD was successful
4131 */
4132
4133 if (ifp->flags & IFA_F_TENTATIVE &&
4134 !(ifp->flags & IFA_F_OPTIMISTIC))
4135 send_na = true;
4136 bump_id = ifp->flags & IFA_F_TENTATIVE;
4137 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4138 spin_unlock(&ifp->lock);
4139 write_unlock_bh(&idev->lock);
4140
4141 addrconf_dad_completed(ifp, bump_id, send_na);
4142
4143 goto out;
4144 }
4145
4146 ifp->dad_probes--;
4147 addrconf_mod_dad_work(ifp,
4148 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4149 HZ/100));
4150 spin_unlock(&ifp->lock);
4151 write_unlock_bh(&idev->lock);
4152
4153 /* send a neighbour solicitation for our addr */
4154 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4155 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4156 ifp->dad_nonce);
4157 out:
4158 in6_ifa_put(ifp);
4159 rtnl_unlock();
4160 }
4161
4162 /* ifp->idev must be at least read locked */
ipv6_lonely_lladdr(struct inet6_ifaddr * ifp)4163 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4164 {
4165 struct inet6_ifaddr *ifpiter;
4166 struct inet6_dev *idev = ifp->idev;
4167
4168 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4169 if (ifpiter->scope > IFA_LINK)
4170 break;
4171 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4172 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4173 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4174 IFA_F_PERMANENT)
4175 return false;
4176 }
4177 return true;
4178 }
4179
addrconf_dad_completed(struct inet6_ifaddr * ifp,bool bump_id,bool send_na)4180 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4181 bool send_na)
4182 {
4183 struct net_device *dev = ifp->idev->dev;
4184 struct in6_addr lladdr;
4185 bool send_rs, send_mld;
4186
4187 addrconf_del_dad_work(ifp);
4188
4189 /*
4190 * Configure the address for reception. Now it is valid.
4191 */
4192
4193 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4194
4195 /* If added prefix is link local and we are prepared to process
4196 router advertisements, start sending router solicitations.
4197 */
4198
4199 read_lock_bh(&ifp->idev->lock);
4200 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4201 send_rs = send_mld &&
4202 ipv6_accept_ra(ifp->idev) &&
4203 ifp->idev->cnf.rtr_solicits != 0 &&
4204 (dev->flags & IFF_LOOPBACK) == 0 &&
4205 (dev->type != ARPHRD_TUNNEL);
4206 read_unlock_bh(&ifp->idev->lock);
4207
4208 /* While dad is in progress mld report's source address is in6_addrany.
4209 * Resend with proper ll now.
4210 */
4211 if (send_mld)
4212 ipv6_mc_dad_complete(ifp->idev);
4213
4214 /* send unsolicited NA if enabled */
4215 if (send_na &&
4216 (ifp->idev->cnf.ndisc_notify ||
4217 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4218 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4219 /*router=*/ !!ifp->idev->cnf.forwarding,
4220 /*solicited=*/ false, /*override=*/ true,
4221 /*inc_opt=*/ true);
4222 }
4223
4224 if (send_rs) {
4225 /*
4226 * If a host as already performed a random delay
4227 * [...] as part of DAD [...] there is no need
4228 * to delay again before sending the first RS
4229 */
4230 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4231 return;
4232 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4233
4234 write_lock_bh(&ifp->idev->lock);
4235 spin_lock(&ifp->lock);
4236 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4237 ifp->idev->cnf.rtr_solicit_interval);
4238 ifp->idev->rs_probes = 1;
4239 ifp->idev->if_flags |= IF_RS_SENT;
4240 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4241 spin_unlock(&ifp->lock);
4242 write_unlock_bh(&ifp->idev->lock);
4243 }
4244
4245 if (bump_id)
4246 rt_genid_bump_ipv6(dev_net(dev));
4247
4248 /* Make sure that a new temporary address will be created
4249 * before this temporary address becomes deprecated.
4250 */
4251 if (ifp->flags & IFA_F_TEMPORARY)
4252 addrconf_verify_rtnl();
4253 }
4254
addrconf_dad_run(struct inet6_dev * idev,bool restart)4255 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4256 {
4257 struct inet6_ifaddr *ifp;
4258
4259 read_lock_bh(&idev->lock);
4260 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4261 spin_lock(&ifp->lock);
4262 if ((ifp->flags & IFA_F_TENTATIVE &&
4263 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4264 if (restart)
4265 ifp->state = INET6_IFADDR_STATE_PREDAD;
4266 addrconf_dad_kick(ifp);
4267 }
4268 spin_unlock(&ifp->lock);
4269 }
4270 read_unlock_bh(&idev->lock);
4271 }
4272
4273 #ifdef CONFIG_PROC_FS
4274 struct if6_iter_state {
4275 struct seq_net_private p;
4276 int bucket;
4277 int offset;
4278 };
4279
if6_get_first(struct seq_file * seq,loff_t pos)4280 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4281 {
4282 struct if6_iter_state *state = seq->private;
4283 struct net *net = seq_file_net(seq);
4284 struct inet6_ifaddr *ifa = NULL;
4285 int p = 0;
4286
4287 /* initial bucket if pos is 0 */
4288 if (pos == 0) {
4289 state->bucket = 0;
4290 state->offset = 0;
4291 }
4292
4293 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4294 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4295 addr_lst) {
4296 if (!net_eq(dev_net(ifa->idev->dev), net))
4297 continue;
4298 /* sync with offset */
4299 if (p < state->offset) {
4300 p++;
4301 continue;
4302 }
4303 return ifa;
4304 }
4305
4306 /* prepare for next bucket */
4307 state->offset = 0;
4308 p = 0;
4309 }
4310 return NULL;
4311 }
4312
if6_get_next(struct seq_file * seq,struct inet6_ifaddr * ifa)4313 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4314 struct inet6_ifaddr *ifa)
4315 {
4316 struct if6_iter_state *state = seq->private;
4317 struct net *net = seq_file_net(seq);
4318
4319 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4320 if (!net_eq(dev_net(ifa->idev->dev), net))
4321 continue;
4322 state->offset++;
4323 return ifa;
4324 }
4325
4326 state->offset = 0;
4327 while (++state->bucket < IN6_ADDR_HSIZE) {
4328 hlist_for_each_entry_rcu(ifa,
4329 &inet6_addr_lst[state->bucket], addr_lst) {
4330 if (!net_eq(dev_net(ifa->idev->dev), net))
4331 continue;
4332 return ifa;
4333 }
4334 }
4335
4336 return NULL;
4337 }
4338
if6_seq_start(struct seq_file * seq,loff_t * pos)4339 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4340 __acquires(rcu)
4341 {
4342 rcu_read_lock();
4343 return if6_get_first(seq, *pos);
4344 }
4345
if6_seq_next(struct seq_file * seq,void * v,loff_t * pos)4346 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4347 {
4348 struct inet6_ifaddr *ifa;
4349
4350 ifa = if6_get_next(seq, v);
4351 ++*pos;
4352 return ifa;
4353 }
4354
if6_seq_stop(struct seq_file * seq,void * v)4355 static void if6_seq_stop(struct seq_file *seq, void *v)
4356 __releases(rcu)
4357 {
4358 rcu_read_unlock();
4359 }
4360
if6_seq_show(struct seq_file * seq,void * v)4361 static int if6_seq_show(struct seq_file *seq, void *v)
4362 {
4363 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4364 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4365 &ifp->addr,
4366 ifp->idev->dev->ifindex,
4367 ifp->prefix_len,
4368 ifp->scope,
4369 (u8) ifp->flags,
4370 ifp->idev->dev->name);
4371 return 0;
4372 }
4373
4374 static const struct seq_operations if6_seq_ops = {
4375 .start = if6_seq_start,
4376 .next = if6_seq_next,
4377 .show = if6_seq_show,
4378 .stop = if6_seq_stop,
4379 };
4380
if6_proc_net_init(struct net * net)4381 static int __net_init if6_proc_net_init(struct net *net)
4382 {
4383 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4384 sizeof(struct if6_iter_state)))
4385 return -ENOMEM;
4386 return 0;
4387 }
4388
if6_proc_net_exit(struct net * net)4389 static void __net_exit if6_proc_net_exit(struct net *net)
4390 {
4391 remove_proc_entry("if_inet6", net->proc_net);
4392 }
4393
4394 static struct pernet_operations if6_proc_net_ops = {
4395 .init = if6_proc_net_init,
4396 .exit = if6_proc_net_exit,
4397 };
4398
if6_proc_init(void)4399 int __init if6_proc_init(void)
4400 {
4401 return register_pernet_subsys(&if6_proc_net_ops);
4402 }
4403
if6_proc_exit(void)4404 void if6_proc_exit(void)
4405 {
4406 unregister_pernet_subsys(&if6_proc_net_ops);
4407 }
4408 #endif /* CONFIG_PROC_FS */
4409
4410 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4411 /* Check if address is a home address configured on any interface. */
ipv6_chk_home_addr(struct net * net,const struct in6_addr * addr)4412 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4413 {
4414 unsigned int hash = inet6_addr_hash(net, addr);
4415 struct inet6_ifaddr *ifp = NULL;
4416 int ret = 0;
4417
4418 rcu_read_lock();
4419 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4420 if (!net_eq(dev_net(ifp->idev->dev), net))
4421 continue;
4422 if (ipv6_addr_equal(&ifp->addr, addr) &&
4423 (ifp->flags & IFA_F_HOMEADDRESS)) {
4424 ret = 1;
4425 break;
4426 }
4427 }
4428 rcu_read_unlock();
4429 return ret;
4430 }
4431 #endif
4432
4433 /* RFC6554 has some algorithm to avoid loops in segment routing by
4434 * checking if the segments contains any of a local interface address.
4435 *
4436 * Quote:
4437 *
4438 * To detect loops in the SRH, a router MUST determine if the SRH
4439 * includes multiple addresses assigned to any interface on that router.
4440 * If such addresses appear more than once and are separated by at least
4441 * one address not assigned to that router.
4442 */
ipv6_chk_rpl_srh_loop(struct net * net,const struct in6_addr * segs,unsigned char nsegs)4443 int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4444 unsigned char nsegs)
4445 {
4446 const struct in6_addr *addr;
4447 int i, ret = 0, found = 0;
4448 struct inet6_ifaddr *ifp;
4449 bool separated = false;
4450 unsigned int hash;
4451 bool hash_found;
4452
4453 rcu_read_lock();
4454 for (i = 0; i < nsegs; i++) {
4455 addr = &segs[i];
4456 hash = inet6_addr_hash(net, addr);
4457
4458 hash_found = false;
4459 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4460 if (!net_eq(dev_net(ifp->idev->dev), net))
4461 continue;
4462
4463 if (ipv6_addr_equal(&ifp->addr, addr)) {
4464 hash_found = true;
4465 break;
4466 }
4467 }
4468
4469 if (hash_found) {
4470 if (found > 1 && separated) {
4471 ret = 1;
4472 break;
4473 }
4474
4475 separated = false;
4476 found++;
4477 } else {
4478 separated = true;
4479 }
4480 }
4481 rcu_read_unlock();
4482
4483 return ret;
4484 }
4485
4486 /*
4487 * Periodic address status verification
4488 */
4489
addrconf_verify_rtnl(void)4490 static void addrconf_verify_rtnl(void)
4491 {
4492 unsigned long now, next, next_sec, next_sched;
4493 struct inet6_ifaddr *ifp;
4494 int i;
4495
4496 ASSERT_RTNL();
4497
4498 rcu_read_lock_bh();
4499 now = jiffies;
4500 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4501
4502 cancel_delayed_work(&addr_chk_work);
4503
4504 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4505 restart:
4506 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4507 unsigned long age;
4508
4509 /* When setting preferred_lft to a value not zero or
4510 * infinity, while valid_lft is infinity
4511 * IFA_F_PERMANENT has a non-infinity life time.
4512 */
4513 if ((ifp->flags & IFA_F_PERMANENT) &&
4514 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4515 continue;
4516
4517 spin_lock(&ifp->lock);
4518 /* We try to batch several events at once. */
4519 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4520
4521 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4522 age >= ifp->valid_lft) {
4523 spin_unlock(&ifp->lock);
4524 in6_ifa_hold(ifp);
4525 ipv6_del_addr(ifp);
4526 goto restart;
4527 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4528 spin_unlock(&ifp->lock);
4529 continue;
4530 } else if (age >= ifp->prefered_lft) {
4531 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4532 int deprecate = 0;
4533
4534 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4535 deprecate = 1;
4536 ifp->flags |= IFA_F_DEPRECATED;
4537 }
4538
4539 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4540 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4541 next = ifp->tstamp + ifp->valid_lft * HZ;
4542
4543 spin_unlock(&ifp->lock);
4544
4545 if (deprecate) {
4546 in6_ifa_hold(ifp);
4547
4548 ipv6_ifa_notify(0, ifp);
4549 in6_ifa_put(ifp);
4550 goto restart;
4551 }
4552 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4553 !(ifp->flags&IFA_F_TENTATIVE)) {
4554 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4555 ifp->idev->cnf.dad_transmits *
4556 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4557
4558 if (age >= ifp->prefered_lft - regen_advance) {
4559 struct inet6_ifaddr *ifpub = ifp->ifpub;
4560 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4561 next = ifp->tstamp + ifp->prefered_lft * HZ;
4562 if (!ifp->regen_count && ifpub) {
4563 ifp->regen_count++;
4564 in6_ifa_hold(ifp);
4565 in6_ifa_hold(ifpub);
4566 spin_unlock(&ifp->lock);
4567
4568 spin_lock(&ifpub->lock);
4569 ifpub->regen_count = 0;
4570 spin_unlock(&ifpub->lock);
4571 rcu_read_unlock_bh();
4572 ipv6_create_tempaddr(ifpub, true);
4573 in6_ifa_put(ifpub);
4574 in6_ifa_put(ifp);
4575 rcu_read_lock_bh();
4576 goto restart;
4577 }
4578 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4579 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4580 spin_unlock(&ifp->lock);
4581 } else {
4582 /* ifp->prefered_lft <= ifp->valid_lft */
4583 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4584 next = ifp->tstamp + ifp->prefered_lft * HZ;
4585 spin_unlock(&ifp->lock);
4586 }
4587 }
4588 }
4589
4590 next_sec = round_jiffies_up(next);
4591 next_sched = next;
4592
4593 /* If rounded timeout is accurate enough, accept it. */
4594 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4595 next_sched = next_sec;
4596
4597 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4598 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4599 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4600
4601 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4602 now, next, next_sec, next_sched);
4603 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4604 rcu_read_unlock_bh();
4605 }
4606
addrconf_verify_work(struct work_struct * w)4607 static void addrconf_verify_work(struct work_struct *w)
4608 {
4609 rtnl_lock();
4610 addrconf_verify_rtnl();
4611 rtnl_unlock();
4612 }
4613
addrconf_verify(void)4614 static void addrconf_verify(void)
4615 {
4616 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4617 }
4618
extract_addr(struct nlattr * addr,struct nlattr * local,struct in6_addr ** peer_pfx)4619 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4620 struct in6_addr **peer_pfx)
4621 {
4622 struct in6_addr *pfx = NULL;
4623
4624 *peer_pfx = NULL;
4625
4626 if (addr)
4627 pfx = nla_data(addr);
4628
4629 if (local) {
4630 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4631 *peer_pfx = pfx;
4632 pfx = nla_data(local);
4633 }
4634
4635 return pfx;
4636 }
4637
4638 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4639 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4640 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4641 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4642 [IFA_FLAGS] = { .len = sizeof(u32) },
4643 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4644 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4645 };
4646
4647 static int
inet6_rtm_deladdr(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4648 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4649 struct netlink_ext_ack *extack)
4650 {
4651 struct net *net = sock_net(skb->sk);
4652 struct ifaddrmsg *ifm;
4653 struct nlattr *tb[IFA_MAX+1];
4654 struct in6_addr *pfx, *peer_pfx;
4655 u32 ifa_flags;
4656 int err;
4657
4658 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4659 ifa_ipv6_policy, extack);
4660 if (err < 0)
4661 return err;
4662
4663 ifm = nlmsg_data(nlh);
4664 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4665 if (!pfx)
4666 return -EINVAL;
4667
4668 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4669
4670 /* We ignore other flags so far. */
4671 ifa_flags &= IFA_F_MANAGETEMPADDR;
4672
4673 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4674 ifm->ifa_prefixlen);
4675 }
4676
modify_prefix_route(struct inet6_ifaddr * ifp,unsigned long expires,u32 flags,bool modify_peer)4677 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4678 unsigned long expires, u32 flags,
4679 bool modify_peer)
4680 {
4681 struct fib6_info *f6i;
4682 u32 prio;
4683
4684 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4685 ifp->prefix_len,
4686 ifp->idev->dev, 0, RTF_DEFAULT, true);
4687 if (!f6i)
4688 return -ENOENT;
4689
4690 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4691 if (f6i->fib6_metric != prio) {
4692 /* delete old one */
4693 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4694
4695 /* add new one */
4696 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4697 ifp->prefix_len,
4698 ifp->rt_priority, ifp->idev->dev,
4699 expires, flags, GFP_KERNEL);
4700 } else {
4701 if (!expires)
4702 fib6_clean_expires(f6i);
4703 else
4704 fib6_set_expires(f6i, expires);
4705
4706 fib6_info_release(f6i);
4707 }
4708
4709 return 0;
4710 }
4711
inet6_addr_modify(struct inet6_ifaddr * ifp,struct ifa6_config * cfg)4712 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4713 {
4714 u32 flags;
4715 clock_t expires;
4716 unsigned long timeout;
4717 bool was_managetempaddr;
4718 bool had_prefixroute;
4719 bool new_peer = false;
4720
4721 ASSERT_RTNL();
4722
4723 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4724 return -EINVAL;
4725
4726 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4727 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4728 return -EINVAL;
4729
4730 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4731 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4732
4733 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4734 if (addrconf_finite_timeout(timeout)) {
4735 expires = jiffies_to_clock_t(timeout * HZ);
4736 cfg->valid_lft = timeout;
4737 flags = RTF_EXPIRES;
4738 } else {
4739 expires = 0;
4740 flags = 0;
4741 cfg->ifa_flags |= IFA_F_PERMANENT;
4742 }
4743
4744 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4745 if (addrconf_finite_timeout(timeout)) {
4746 if (timeout == 0)
4747 cfg->ifa_flags |= IFA_F_DEPRECATED;
4748 cfg->preferred_lft = timeout;
4749 }
4750
4751 if (cfg->peer_pfx &&
4752 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4753 if (!ipv6_addr_any(&ifp->peer_addr))
4754 cleanup_prefix_route(ifp, expires, true, true);
4755 new_peer = true;
4756 }
4757
4758 spin_lock_bh(&ifp->lock);
4759 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4760 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4761 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4762 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4763 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4764 IFA_F_NOPREFIXROUTE);
4765 ifp->flags |= cfg->ifa_flags;
4766 ifp->tstamp = jiffies;
4767 ifp->valid_lft = cfg->valid_lft;
4768 ifp->prefered_lft = cfg->preferred_lft;
4769
4770 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4771 ifp->rt_priority = cfg->rt_priority;
4772
4773 if (new_peer)
4774 ifp->peer_addr = *cfg->peer_pfx;
4775
4776 spin_unlock_bh(&ifp->lock);
4777 if (!(ifp->flags&IFA_F_TENTATIVE))
4778 ipv6_ifa_notify(0, ifp);
4779
4780 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4781 int rc = -ENOENT;
4782
4783 if (had_prefixroute)
4784 rc = modify_prefix_route(ifp, expires, flags, false);
4785
4786 /* prefix route could have been deleted; if so restore it */
4787 if (rc == -ENOENT) {
4788 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4789 ifp->rt_priority, ifp->idev->dev,
4790 expires, flags, GFP_KERNEL);
4791 }
4792
4793 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4794 rc = modify_prefix_route(ifp, expires, flags, true);
4795
4796 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4797 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4798 ifp->rt_priority, ifp->idev->dev,
4799 expires, flags, GFP_KERNEL);
4800 }
4801 } else if (had_prefixroute) {
4802 enum cleanup_prefix_rt_t action;
4803 unsigned long rt_expires;
4804
4805 write_lock_bh(&ifp->idev->lock);
4806 action = check_cleanup_prefix_route(ifp, &rt_expires);
4807 write_unlock_bh(&ifp->idev->lock);
4808
4809 if (action != CLEANUP_PREFIX_RT_NOP) {
4810 cleanup_prefix_route(ifp, rt_expires,
4811 action == CLEANUP_PREFIX_RT_DEL, false);
4812 }
4813 }
4814
4815 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4816 if (was_managetempaddr &&
4817 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4818 cfg->valid_lft = 0;
4819 cfg->preferred_lft = 0;
4820 }
4821 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4822 cfg->preferred_lft, !was_managetempaddr,
4823 jiffies);
4824 }
4825
4826 addrconf_verify_rtnl();
4827
4828 return 0;
4829 }
4830
4831 static int
inet6_rtm_newaddr(struct sk_buff * skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)4832 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4833 struct netlink_ext_ack *extack)
4834 {
4835 struct net *net = sock_net(skb->sk);
4836 struct ifaddrmsg *ifm;
4837 struct nlattr *tb[IFA_MAX+1];
4838 struct in6_addr *peer_pfx;
4839 struct inet6_ifaddr *ifa;
4840 struct net_device *dev;
4841 struct inet6_dev *idev;
4842 struct ifa6_config cfg;
4843 int err;
4844
4845 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4846 ifa_ipv6_policy, extack);
4847 if (err < 0)
4848 return err;
4849
4850 memset(&cfg, 0, sizeof(cfg));
4851
4852 ifm = nlmsg_data(nlh);
4853 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4854 if (!cfg.pfx)
4855 return -EINVAL;
4856
4857 cfg.peer_pfx = peer_pfx;
4858 cfg.plen = ifm->ifa_prefixlen;
4859 if (tb[IFA_RT_PRIORITY])
4860 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4861
4862 cfg.valid_lft = INFINITY_LIFE_TIME;
4863 cfg.preferred_lft = INFINITY_LIFE_TIME;
4864
4865 if (tb[IFA_CACHEINFO]) {
4866 struct ifa_cacheinfo *ci;
4867
4868 ci = nla_data(tb[IFA_CACHEINFO]);
4869 cfg.valid_lft = ci->ifa_valid;
4870 cfg.preferred_lft = ci->ifa_prefered;
4871 }
4872
4873 dev = __dev_get_by_index(net, ifm->ifa_index);
4874 if (!dev)
4875 return -ENODEV;
4876
4877 if (tb[IFA_FLAGS])
4878 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4879 else
4880 cfg.ifa_flags = ifm->ifa_flags;
4881
4882 /* We ignore other flags so far. */
4883 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4884 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4885 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4886
4887 idev = ipv6_find_idev(dev);
4888 if (IS_ERR(idev))
4889 return PTR_ERR(idev);
4890
4891 if (!ipv6_allow_optimistic_dad(net, idev))
4892 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4893
4894 if (cfg.ifa_flags & IFA_F_NODAD &&
4895 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4896 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4897 return -EINVAL;
4898 }
4899
4900 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4901 if (!ifa) {
4902 /*
4903 * It would be best to check for !NLM_F_CREATE here but
4904 * userspace already relies on not having to provide this.
4905 */
4906 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4907 }
4908
4909 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4910 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4911 err = -EEXIST;
4912 else
4913 err = inet6_addr_modify(ifa, &cfg);
4914
4915 in6_ifa_put(ifa);
4916
4917 return err;
4918 }
4919
put_ifaddrmsg(struct nlmsghdr * nlh,u8 prefixlen,u32 flags,u8 scope,int ifindex)4920 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4921 u8 scope, int ifindex)
4922 {
4923 struct ifaddrmsg *ifm;
4924
4925 ifm = nlmsg_data(nlh);
4926 ifm->ifa_family = AF_INET6;
4927 ifm->ifa_prefixlen = prefixlen;
4928 ifm->ifa_flags = flags;
4929 ifm->ifa_scope = scope;
4930 ifm->ifa_index = ifindex;
4931 }
4932
put_cacheinfo(struct sk_buff * skb,unsigned long cstamp,unsigned long tstamp,u32 preferred,u32 valid)4933 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4934 unsigned long tstamp, u32 preferred, u32 valid)
4935 {
4936 struct ifa_cacheinfo ci;
4937
4938 ci.cstamp = cstamp_delta(cstamp);
4939 ci.tstamp = cstamp_delta(tstamp);
4940 ci.ifa_prefered = preferred;
4941 ci.ifa_valid = valid;
4942
4943 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4944 }
4945
rt_scope(int ifa_scope)4946 static inline int rt_scope(int ifa_scope)
4947 {
4948 if (ifa_scope & IFA_HOST)
4949 return RT_SCOPE_HOST;
4950 else if (ifa_scope & IFA_LINK)
4951 return RT_SCOPE_LINK;
4952 else if (ifa_scope & IFA_SITE)
4953 return RT_SCOPE_SITE;
4954 else
4955 return RT_SCOPE_UNIVERSE;
4956 }
4957
inet6_ifaddr_msgsize(void)4958 static inline int inet6_ifaddr_msgsize(void)
4959 {
4960 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4961 + nla_total_size(16) /* IFA_LOCAL */
4962 + nla_total_size(16) /* IFA_ADDRESS */
4963 + nla_total_size(sizeof(struct ifa_cacheinfo))
4964 + nla_total_size(4) /* IFA_FLAGS */
4965 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4966 }
4967
4968 enum addr_type_t {
4969 UNICAST_ADDR,
4970 MULTICAST_ADDR,
4971 ANYCAST_ADDR,
4972 };
4973
4974 struct inet6_fill_args {
4975 u32 portid;
4976 u32 seq;
4977 int event;
4978 unsigned int flags;
4979 int netnsid;
4980 int ifindex;
4981 enum addr_type_t type;
4982 };
4983
inet6_fill_ifaddr(struct sk_buff * skb,struct inet6_ifaddr * ifa,struct inet6_fill_args * args)4984 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4985 struct inet6_fill_args *args)
4986 {
4987 struct nlmsghdr *nlh;
4988 u32 preferred, valid;
4989
4990 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4991 sizeof(struct ifaddrmsg), args->flags);
4992 if (!nlh)
4993 return -EMSGSIZE;
4994
4995 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4996 ifa->idev->dev->ifindex);
4997
4998 if (args->netnsid >= 0 &&
4999 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5000 goto error;
5001
5002 spin_lock_bh(&ifa->lock);
5003 if (!((ifa->flags&IFA_F_PERMANENT) &&
5004 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
5005 preferred = ifa->prefered_lft;
5006 valid = ifa->valid_lft;
5007 if (preferred != INFINITY_LIFE_TIME) {
5008 long tval = (jiffies - ifa->tstamp)/HZ;
5009 if (preferred > tval)
5010 preferred -= tval;
5011 else
5012 preferred = 0;
5013 if (valid != INFINITY_LIFE_TIME) {
5014 if (valid > tval)
5015 valid -= tval;
5016 else
5017 valid = 0;
5018 }
5019 }
5020 } else {
5021 preferred = INFINITY_LIFE_TIME;
5022 valid = INFINITY_LIFE_TIME;
5023 }
5024 spin_unlock_bh(&ifa->lock);
5025
5026 if (!ipv6_addr_any(&ifa->peer_addr)) {
5027 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
5028 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
5029 goto error;
5030 } else
5031 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
5032 goto error;
5033
5034 if (ifa->rt_priority &&
5035 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
5036 goto error;
5037
5038 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
5039 goto error;
5040
5041 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
5042 goto error;
5043
5044 nlmsg_end(skb, nlh);
5045 return 0;
5046
5047 error:
5048 nlmsg_cancel(skb, nlh);
5049 return -EMSGSIZE;
5050 }
5051
inet6_fill_ifmcaddr(struct sk_buff * skb,struct ifmcaddr6 * ifmca,struct inet6_fill_args * args)5052 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
5053 struct inet6_fill_args *args)
5054 {
5055 struct nlmsghdr *nlh;
5056 u8 scope = RT_SCOPE_UNIVERSE;
5057 int ifindex = ifmca->idev->dev->ifindex;
5058
5059 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
5060 scope = RT_SCOPE_SITE;
5061
5062 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5063 sizeof(struct ifaddrmsg), args->flags);
5064 if (!nlh)
5065 return -EMSGSIZE;
5066
5067 if (args->netnsid >= 0 &&
5068 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5069 nlmsg_cancel(skb, nlh);
5070 return -EMSGSIZE;
5071 }
5072
5073 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5074 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5075 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5076 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5077 nlmsg_cancel(skb, nlh);
5078 return -EMSGSIZE;
5079 }
5080
5081 nlmsg_end(skb, nlh);
5082 return 0;
5083 }
5084
inet6_fill_ifacaddr(struct sk_buff * skb,struct ifacaddr6 * ifaca,struct inet6_fill_args * args)5085 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5086 struct inet6_fill_args *args)
5087 {
5088 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5089 int ifindex = dev ? dev->ifindex : 1;
5090 struct nlmsghdr *nlh;
5091 u8 scope = RT_SCOPE_UNIVERSE;
5092
5093 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5094 scope = RT_SCOPE_SITE;
5095
5096 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5097 sizeof(struct ifaddrmsg), args->flags);
5098 if (!nlh)
5099 return -EMSGSIZE;
5100
5101 if (args->netnsid >= 0 &&
5102 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid)) {
5103 nlmsg_cancel(skb, nlh);
5104 return -EMSGSIZE;
5105 }
5106
5107 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5108 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5109 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5110 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5111 nlmsg_cancel(skb, nlh);
5112 return -EMSGSIZE;
5113 }
5114
5115 nlmsg_end(skb, nlh);
5116 return 0;
5117 }
5118
5119 /* 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)5120 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5121 struct netlink_callback *cb, int s_ip_idx,
5122 struct inet6_fill_args *fillargs)
5123 {
5124 struct ifmcaddr6 *ifmca;
5125 struct ifacaddr6 *ifaca;
5126 int ip_idx = 0;
5127 int err = 1;
5128
5129 read_lock_bh(&idev->lock);
5130 switch (fillargs->type) {
5131 case UNICAST_ADDR: {
5132 struct inet6_ifaddr *ifa;
5133 fillargs->event = RTM_NEWADDR;
5134
5135 /* unicast address incl. temp addr */
5136 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5137 if (ip_idx < s_ip_idx)
5138 goto next;
5139 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5140 if (err < 0)
5141 break;
5142 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5143 next:
5144 ip_idx++;
5145 }
5146 break;
5147 }
5148 case MULTICAST_ADDR:
5149 fillargs->event = RTM_GETMULTICAST;
5150
5151 /* multicast address */
5152 for (ifmca = idev->mc_list; ifmca;
5153 ifmca = ifmca->next, ip_idx++) {
5154 if (ip_idx < s_ip_idx)
5155 continue;
5156 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5157 if (err < 0)
5158 break;
5159 }
5160 break;
5161 case ANYCAST_ADDR:
5162 fillargs->event = RTM_GETANYCAST;
5163 /* anycast address */
5164 for (ifaca = idev->ac_list; ifaca;
5165 ifaca = ifaca->aca_next, ip_idx++) {
5166 if (ip_idx < s_ip_idx)
5167 continue;
5168 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5169 if (err < 0)
5170 break;
5171 }
5172 break;
5173 default:
5174 break;
5175 }
5176 read_unlock_bh(&idev->lock);
5177 cb->args[2] = ip_idx;
5178 return err;
5179 }
5180
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)5181 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5182 struct inet6_fill_args *fillargs,
5183 struct net **tgt_net, struct sock *sk,
5184 struct netlink_callback *cb)
5185 {
5186 struct netlink_ext_ack *extack = cb->extack;
5187 struct nlattr *tb[IFA_MAX+1];
5188 struct ifaddrmsg *ifm;
5189 int err, i;
5190
5191 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5192 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5193 return -EINVAL;
5194 }
5195
5196 ifm = nlmsg_data(nlh);
5197 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5198 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5199 return -EINVAL;
5200 }
5201
5202 fillargs->ifindex = ifm->ifa_index;
5203 if (fillargs->ifindex) {
5204 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5205 fillargs->flags |= NLM_F_DUMP_FILTERED;
5206 }
5207
5208 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5209 ifa_ipv6_policy, extack);
5210 if (err < 0)
5211 return err;
5212
5213 for (i = 0; i <= IFA_MAX; ++i) {
5214 if (!tb[i])
5215 continue;
5216
5217 if (i == IFA_TARGET_NETNSID) {
5218 struct net *net;
5219
5220 fillargs->netnsid = nla_get_s32(tb[i]);
5221 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5222 if (IS_ERR(net)) {
5223 fillargs->netnsid = -1;
5224 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5225 return PTR_ERR(net);
5226 }
5227 *tgt_net = net;
5228 } else {
5229 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5230 return -EINVAL;
5231 }
5232 }
5233
5234 return 0;
5235 }
5236
inet6_dump_addr(struct sk_buff * skb,struct netlink_callback * cb,enum addr_type_t type)5237 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5238 enum addr_type_t type)
5239 {
5240 const struct nlmsghdr *nlh = cb->nlh;
5241 struct inet6_fill_args fillargs = {
5242 .portid = NETLINK_CB(cb->skb).portid,
5243 .seq = cb->nlh->nlmsg_seq,
5244 .flags = NLM_F_MULTI,
5245 .netnsid = -1,
5246 .type = type,
5247 };
5248 struct net *net = sock_net(skb->sk);
5249 struct net *tgt_net = net;
5250 int idx, s_idx, s_ip_idx;
5251 int h, s_h;
5252 struct net_device *dev;
5253 struct inet6_dev *idev;
5254 struct hlist_head *head;
5255 int err = 0;
5256
5257 s_h = cb->args[0];
5258 s_idx = idx = cb->args[1];
5259 s_ip_idx = cb->args[2];
5260
5261 if (cb->strict_check) {
5262 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5263 skb->sk, cb);
5264 if (err < 0)
5265 goto put_tgt_net;
5266
5267 err = 0;
5268 if (fillargs.ifindex) {
5269 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5270 if (!dev) {
5271 err = -ENODEV;
5272 goto put_tgt_net;
5273 }
5274 idev = __in6_dev_get(dev);
5275 if (idev) {
5276 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5277 &fillargs);
5278 if (err > 0)
5279 err = 0;
5280 }
5281 goto put_tgt_net;
5282 }
5283 }
5284
5285 rcu_read_lock();
5286 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5287 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5288 idx = 0;
5289 head = &tgt_net->dev_index_head[h];
5290 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5291 if (idx < s_idx)
5292 goto cont;
5293 if (h > s_h || idx > s_idx)
5294 s_ip_idx = 0;
5295 idev = __in6_dev_get(dev);
5296 if (!idev)
5297 goto cont;
5298
5299 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5300 &fillargs) < 0)
5301 goto done;
5302 cont:
5303 idx++;
5304 }
5305 }
5306 done:
5307 rcu_read_unlock();
5308 cb->args[0] = h;
5309 cb->args[1] = idx;
5310 put_tgt_net:
5311 if (fillargs.netnsid >= 0)
5312 put_net(tgt_net);
5313
5314 return skb->len ? : err;
5315 }
5316
inet6_dump_ifaddr(struct sk_buff * skb,struct netlink_callback * cb)5317 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5318 {
5319 enum addr_type_t type = UNICAST_ADDR;
5320
5321 return inet6_dump_addr(skb, cb, type);
5322 }
5323
inet6_dump_ifmcaddr(struct sk_buff * skb,struct netlink_callback * cb)5324 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5325 {
5326 enum addr_type_t type = MULTICAST_ADDR;
5327
5328 return inet6_dump_addr(skb, cb, type);
5329 }
5330
5331
inet6_dump_ifacaddr(struct sk_buff * skb,struct netlink_callback * cb)5332 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5333 {
5334 enum addr_type_t type = ANYCAST_ADDR;
5335
5336 return inet6_dump_addr(skb, cb, type);
5337 }
5338
inet6_rtm_valid_getaddr_req(struct sk_buff * skb,const struct nlmsghdr * nlh,struct nlattr ** tb,struct netlink_ext_ack * extack)5339 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5340 const struct nlmsghdr *nlh,
5341 struct nlattr **tb,
5342 struct netlink_ext_ack *extack)
5343 {
5344 struct ifaddrmsg *ifm;
5345 int i, err;
5346
5347 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5348 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5349 return -EINVAL;
5350 }
5351
5352 if (!netlink_strict_get_check(skb))
5353 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5354 ifa_ipv6_policy, extack);
5355
5356 ifm = nlmsg_data(nlh);
5357 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5358 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5359 return -EINVAL;
5360 }
5361
5362 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5363 ifa_ipv6_policy, extack);
5364 if (err)
5365 return err;
5366
5367 for (i = 0; i <= IFA_MAX; i++) {
5368 if (!tb[i])
5369 continue;
5370
5371 switch (i) {
5372 case IFA_TARGET_NETNSID:
5373 case IFA_ADDRESS:
5374 case IFA_LOCAL:
5375 break;
5376 default:
5377 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5378 return -EINVAL;
5379 }
5380 }
5381
5382 return 0;
5383 }
5384
inet6_rtm_getaddr(struct sk_buff * in_skb,struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5385 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5386 struct netlink_ext_ack *extack)
5387 {
5388 struct net *net = sock_net(in_skb->sk);
5389 struct inet6_fill_args fillargs = {
5390 .portid = NETLINK_CB(in_skb).portid,
5391 .seq = nlh->nlmsg_seq,
5392 .event = RTM_NEWADDR,
5393 .flags = 0,
5394 .netnsid = -1,
5395 };
5396 struct net *tgt_net = net;
5397 struct ifaddrmsg *ifm;
5398 struct nlattr *tb[IFA_MAX+1];
5399 struct in6_addr *addr = NULL, *peer;
5400 struct net_device *dev = NULL;
5401 struct inet6_ifaddr *ifa;
5402 struct sk_buff *skb;
5403 int err;
5404
5405 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5406 if (err < 0)
5407 return err;
5408
5409 if (tb[IFA_TARGET_NETNSID]) {
5410 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5411
5412 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5413 fillargs.netnsid);
5414 if (IS_ERR(tgt_net))
5415 return PTR_ERR(tgt_net);
5416 }
5417
5418 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5419 if (!addr)
5420 return -EINVAL;
5421
5422 ifm = nlmsg_data(nlh);
5423 if (ifm->ifa_index)
5424 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5425
5426 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5427 if (!ifa) {
5428 err = -EADDRNOTAVAIL;
5429 goto errout;
5430 }
5431
5432 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5433 if (!skb) {
5434 err = -ENOBUFS;
5435 goto errout_ifa;
5436 }
5437
5438 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5439 if (err < 0) {
5440 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5441 WARN_ON(err == -EMSGSIZE);
5442 kfree_skb(skb);
5443 goto errout_ifa;
5444 }
5445 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5446 errout_ifa:
5447 in6_ifa_put(ifa);
5448 errout:
5449 if (dev)
5450 dev_put(dev);
5451 if (fillargs.netnsid >= 0)
5452 put_net(tgt_net);
5453
5454 return err;
5455 }
5456
inet6_ifa_notify(int event,struct inet6_ifaddr * ifa)5457 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5458 {
5459 struct sk_buff *skb;
5460 struct net *net = dev_net(ifa->idev->dev);
5461 struct inet6_fill_args fillargs = {
5462 .portid = 0,
5463 .seq = 0,
5464 .event = event,
5465 .flags = 0,
5466 .netnsid = -1,
5467 };
5468 int err = -ENOBUFS;
5469
5470 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5471 if (!skb)
5472 goto errout;
5473
5474 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5475 if (err < 0) {
5476 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5477 WARN_ON(err == -EMSGSIZE);
5478 kfree_skb(skb);
5479 goto errout;
5480 }
5481 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5482 return;
5483 errout:
5484 if (err < 0)
5485 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5486 }
5487
ipv6_store_devconf(struct ipv6_devconf * cnf,__s32 * array,int bytes)5488 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5489 __s32 *array, int bytes)
5490 {
5491 BUG_ON(bytes < (DEVCONF_MAX * 4));
5492
5493 memset(array, 0, bytes);
5494 array[DEVCONF_FORWARDING] = cnf->forwarding;
5495 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5496 array[DEVCONF_MTU6] = cnf->mtu6;
5497 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5498 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5499 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5500 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5501 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5502 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5503 jiffies_to_msecs(cnf->rtr_solicit_interval);
5504 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5505 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5506 array[DEVCONF_RTR_SOLICIT_DELAY] =
5507 jiffies_to_msecs(cnf->rtr_solicit_delay);
5508 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5509 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5510 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5511 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5512 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5513 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5514 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5515 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5516 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5517 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5518 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5519 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5520 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5521 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5522 #ifdef CONFIG_IPV6_ROUTER_PREF
5523 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5524 array[DEVCONF_RTR_PROBE_INTERVAL] =
5525 jiffies_to_msecs(cnf->rtr_probe_interval);
5526 #ifdef CONFIG_IPV6_ROUTE_INFO
5527 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5528 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5529 #endif
5530 #endif
5531 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5532 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5533 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5534 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5535 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5536 #endif
5537 #ifdef CONFIG_IPV6_MROUTE
5538 array[DEVCONF_MC_FORWARDING] = atomic_read(&cnf->mc_forwarding);
5539 #endif
5540 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5541 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5542 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5543 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5544 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5545 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5546 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5547 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5548 /* we omit DEVCONF_STABLE_SECRET for now */
5549 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5550 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5551 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5552 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5553 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5554 #ifdef CONFIG_IPV6_SEG6_HMAC
5555 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5556 #endif
5557 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5558 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5559 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5560 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5561 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5562 }
5563
inet6_ifla6_size(void)5564 static inline size_t inet6_ifla6_size(void)
5565 {
5566 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5567 + nla_total_size(sizeof(struct ifla_cacheinfo))
5568 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5569 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5570 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5571 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5572 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5573 + 0;
5574 }
5575
inet6_if_nlmsg_size(void)5576 static inline size_t inet6_if_nlmsg_size(void)
5577 {
5578 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5579 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5580 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5581 + nla_total_size(4) /* IFLA_MTU */
5582 + nla_total_size(4) /* IFLA_LINK */
5583 + nla_total_size(1) /* IFLA_OPERSTATE */
5584 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5585 }
5586
__snmp6_fill_statsdev(u64 * stats,atomic_long_t * mib,int bytes)5587 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5588 int bytes)
5589 {
5590 int i;
5591 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5592 BUG_ON(pad < 0);
5593
5594 /* Use put_unaligned() because stats may not be aligned for u64. */
5595 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5596 for (i = 1; i < ICMP6_MIB_MAX; i++)
5597 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5598
5599 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5600 }
5601
__snmp6_fill_stats64(u64 * stats,void __percpu * mib,int bytes,size_t syncpoff)5602 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5603 int bytes, size_t syncpoff)
5604 {
5605 int i, c;
5606 u64 buff[IPSTATS_MIB_MAX];
5607 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5608
5609 BUG_ON(pad < 0);
5610
5611 memset(buff, 0, sizeof(buff));
5612 buff[0] = IPSTATS_MIB_MAX;
5613
5614 for_each_possible_cpu(c) {
5615 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5616 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5617 }
5618
5619 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5620 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5621 }
5622
snmp6_fill_stats(u64 * stats,struct inet6_dev * idev,int attrtype,int bytes)5623 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5624 int bytes)
5625 {
5626 switch (attrtype) {
5627 case IFLA_INET6_STATS:
5628 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5629 offsetof(struct ipstats_mib, syncp));
5630 break;
5631 case IFLA_INET6_ICMP6STATS:
5632 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5633 break;
5634 }
5635 }
5636
inet6_fill_ifla6_attrs(struct sk_buff * skb,struct inet6_dev * idev,u32 ext_filter_mask)5637 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5638 u32 ext_filter_mask)
5639 {
5640 struct nlattr *nla;
5641 struct ifla_cacheinfo ci;
5642
5643 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5644 goto nla_put_failure;
5645 ci.max_reasm_len = IPV6_MAXPLEN;
5646 ci.tstamp = cstamp_delta(idev->tstamp);
5647 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5648 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5649 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5650 goto nla_put_failure;
5651 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5652 if (!nla)
5653 goto nla_put_failure;
5654 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5655
5656 /* XXX - MC not implemented */
5657
5658 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5659 return 0;
5660
5661 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5662 if (!nla)
5663 goto nla_put_failure;
5664 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5665
5666 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5667 if (!nla)
5668 goto nla_put_failure;
5669 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5670
5671 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5672 if (!nla)
5673 goto nla_put_failure;
5674 read_lock_bh(&idev->lock);
5675 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5676 read_unlock_bh(&idev->lock);
5677
5678 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5679 goto nla_put_failure;
5680
5681 return 0;
5682
5683 nla_put_failure:
5684 return -EMSGSIZE;
5685 }
5686
inet6_get_link_af_size(const struct net_device * dev,u32 ext_filter_mask)5687 static size_t inet6_get_link_af_size(const struct net_device *dev,
5688 u32 ext_filter_mask)
5689 {
5690 if (!__in6_dev_get(dev))
5691 return 0;
5692
5693 return inet6_ifla6_size();
5694 }
5695
inet6_fill_link_af(struct sk_buff * skb,const struct net_device * dev,u32 ext_filter_mask)5696 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5697 u32 ext_filter_mask)
5698 {
5699 struct inet6_dev *idev = __in6_dev_get(dev);
5700
5701 if (!idev)
5702 return -ENODATA;
5703
5704 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5705 return -EMSGSIZE;
5706
5707 return 0;
5708 }
5709
inet6_set_iftoken(struct inet6_dev * idev,struct in6_addr * token)5710 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5711 {
5712 struct inet6_ifaddr *ifp;
5713 struct net_device *dev = idev->dev;
5714 bool clear_token, update_rs = false;
5715 struct in6_addr ll_addr;
5716
5717 ASSERT_RTNL();
5718
5719 if (!token)
5720 return -EINVAL;
5721 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5722 return -EINVAL;
5723 if (!ipv6_accept_ra(idev))
5724 return -EINVAL;
5725 if (idev->cnf.rtr_solicits == 0)
5726 return -EINVAL;
5727
5728 write_lock_bh(&idev->lock);
5729
5730 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5731 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5732
5733 write_unlock_bh(&idev->lock);
5734
5735 clear_token = ipv6_addr_any(token);
5736 if (clear_token)
5737 goto update_lft;
5738
5739 if (!idev->dead && (idev->if_flags & IF_READY) &&
5740 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5741 IFA_F_OPTIMISTIC)) {
5742 /* If we're not ready, then normal ifup will take care
5743 * of this. Otherwise, we need to request our rs here.
5744 */
5745 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5746 update_rs = true;
5747 }
5748
5749 update_lft:
5750 write_lock_bh(&idev->lock);
5751
5752 if (update_rs) {
5753 idev->if_flags |= IF_RS_SENT;
5754 idev->rs_interval = rfc3315_s14_backoff_init(
5755 idev->cnf.rtr_solicit_interval);
5756 idev->rs_probes = 1;
5757 addrconf_mod_rs_timer(idev, idev->rs_interval);
5758 }
5759
5760 /* Well, that's kinda nasty ... */
5761 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5762 spin_lock(&ifp->lock);
5763 if (ifp->tokenized) {
5764 ifp->valid_lft = 0;
5765 ifp->prefered_lft = 0;
5766 }
5767 spin_unlock(&ifp->lock);
5768 }
5769
5770 write_unlock_bh(&idev->lock);
5771 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5772 addrconf_verify_rtnl();
5773 return 0;
5774 }
5775
5776 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5777 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5778 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5779 };
5780
check_addr_gen_mode(int mode)5781 static int check_addr_gen_mode(int mode)
5782 {
5783 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5784 mode != IN6_ADDR_GEN_MODE_NONE &&
5785 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5786 mode != IN6_ADDR_GEN_MODE_RANDOM)
5787 return -EINVAL;
5788 return 1;
5789 }
5790
check_stable_privacy(struct inet6_dev * idev,struct net * net,int mode)5791 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5792 int mode)
5793 {
5794 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5795 !idev->cnf.stable_secret.initialized &&
5796 !net->ipv6.devconf_dflt->stable_secret.initialized)
5797 return -EINVAL;
5798 return 1;
5799 }
5800
inet6_validate_link_af(const struct net_device * dev,const struct nlattr * nla)5801 static int inet6_validate_link_af(const struct net_device *dev,
5802 const struct nlattr *nla)
5803 {
5804 struct nlattr *tb[IFLA_INET6_MAX + 1];
5805 struct inet6_dev *idev = NULL;
5806 int err;
5807
5808 if (dev) {
5809 idev = __in6_dev_get(dev);
5810 if (!idev)
5811 return -EAFNOSUPPORT;
5812 }
5813
5814 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5815 inet6_af_policy, NULL);
5816 if (err)
5817 return err;
5818
5819 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5820 return -EINVAL;
5821
5822 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5823 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5824
5825 if (check_addr_gen_mode(mode) < 0)
5826 return -EINVAL;
5827 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5828 return -EINVAL;
5829 }
5830
5831 return 0;
5832 }
5833
inet6_set_link_af(struct net_device * dev,const struct nlattr * nla)5834 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5835 {
5836 struct inet6_dev *idev = __in6_dev_get(dev);
5837 struct nlattr *tb[IFLA_INET6_MAX + 1];
5838 int err;
5839
5840 if (!idev)
5841 return -EAFNOSUPPORT;
5842
5843 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5844 return -EINVAL;
5845
5846 if (tb[IFLA_INET6_TOKEN]) {
5847 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5848 if (err)
5849 return err;
5850 }
5851
5852 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5853 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5854
5855 idev->cnf.addr_gen_mode = mode;
5856 }
5857
5858 return 0;
5859 }
5860
inet6_fill_ifinfo(struct sk_buff * skb,struct inet6_dev * idev,u32 portid,u32 seq,int event,unsigned int flags)5861 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5862 u32 portid, u32 seq, int event, unsigned int flags)
5863 {
5864 struct net_device *dev = idev->dev;
5865 struct ifinfomsg *hdr;
5866 struct nlmsghdr *nlh;
5867 void *protoinfo;
5868
5869 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5870 if (!nlh)
5871 return -EMSGSIZE;
5872
5873 hdr = nlmsg_data(nlh);
5874 hdr->ifi_family = AF_INET6;
5875 hdr->__ifi_pad = 0;
5876 hdr->ifi_type = dev->type;
5877 hdr->ifi_index = dev->ifindex;
5878 hdr->ifi_flags = dev_get_flags(dev);
5879 hdr->ifi_change = 0;
5880
5881 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5882 (dev->addr_len &&
5883 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5884 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5885 (dev->ifindex != dev_get_iflink(dev) &&
5886 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5887 nla_put_u8(skb, IFLA_OPERSTATE,
5888 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5889 goto nla_put_failure;
5890 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5891 if (!protoinfo)
5892 goto nla_put_failure;
5893
5894 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5895 goto nla_put_failure;
5896
5897 nla_nest_end(skb, protoinfo);
5898 nlmsg_end(skb, nlh);
5899 return 0;
5900
5901 nla_put_failure:
5902 nlmsg_cancel(skb, nlh);
5903 return -EMSGSIZE;
5904 }
5905
inet6_valid_dump_ifinfo(const struct nlmsghdr * nlh,struct netlink_ext_ack * extack)5906 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5907 struct netlink_ext_ack *extack)
5908 {
5909 struct ifinfomsg *ifm;
5910
5911 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5912 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5913 return -EINVAL;
5914 }
5915
5916 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5917 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5918 return -EINVAL;
5919 }
5920
5921 ifm = nlmsg_data(nlh);
5922 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5923 ifm->ifi_change || ifm->ifi_index) {
5924 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5925 return -EINVAL;
5926 }
5927
5928 return 0;
5929 }
5930
inet6_dump_ifinfo(struct sk_buff * skb,struct netlink_callback * cb)5931 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5932 {
5933 struct net *net = sock_net(skb->sk);
5934 int h, s_h;
5935 int idx = 0, s_idx;
5936 struct net_device *dev;
5937 struct inet6_dev *idev;
5938 struct hlist_head *head;
5939
5940 /* only requests using strict checking can pass data to
5941 * influence the dump
5942 */
5943 if (cb->strict_check) {
5944 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5945
5946 if (err < 0)
5947 return err;
5948 }
5949
5950 s_h = cb->args[0];
5951 s_idx = cb->args[1];
5952
5953 rcu_read_lock();
5954 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5955 idx = 0;
5956 head = &net->dev_index_head[h];
5957 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5958 if (idx < s_idx)
5959 goto cont;
5960 idev = __in6_dev_get(dev);
5961 if (!idev)
5962 goto cont;
5963 if (inet6_fill_ifinfo(skb, idev,
5964 NETLINK_CB(cb->skb).portid,
5965 cb->nlh->nlmsg_seq,
5966 RTM_NEWLINK, NLM_F_MULTI) < 0)
5967 goto out;
5968 cont:
5969 idx++;
5970 }
5971 }
5972 out:
5973 rcu_read_unlock();
5974 cb->args[1] = idx;
5975 cb->args[0] = h;
5976
5977 return skb->len;
5978 }
5979
inet6_ifinfo_notify(int event,struct inet6_dev * idev)5980 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5981 {
5982 struct sk_buff *skb;
5983 struct net *net = dev_net(idev->dev);
5984 int err = -ENOBUFS;
5985
5986 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5987 if (!skb)
5988 goto errout;
5989
5990 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5991 if (err < 0) {
5992 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5993 WARN_ON(err == -EMSGSIZE);
5994 kfree_skb(skb);
5995 goto errout;
5996 }
5997 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5998 return;
5999 errout:
6000 if (err < 0)
6001 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
6002 }
6003
inet6_prefix_nlmsg_size(void)6004 static inline size_t inet6_prefix_nlmsg_size(void)
6005 {
6006 return NLMSG_ALIGN(sizeof(struct prefixmsg))
6007 + nla_total_size(sizeof(struct in6_addr))
6008 + nla_total_size(sizeof(struct prefix_cacheinfo));
6009 }
6010
inet6_fill_prefix(struct sk_buff * skb,struct inet6_dev * idev,struct prefix_info * pinfo,u32 portid,u32 seq,int event,unsigned int flags)6011 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
6012 struct prefix_info *pinfo, u32 portid, u32 seq,
6013 int event, unsigned int flags)
6014 {
6015 struct prefixmsg *pmsg;
6016 struct nlmsghdr *nlh;
6017 struct prefix_cacheinfo ci;
6018
6019 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
6020 if (!nlh)
6021 return -EMSGSIZE;
6022
6023 pmsg = nlmsg_data(nlh);
6024 pmsg->prefix_family = AF_INET6;
6025 pmsg->prefix_pad1 = 0;
6026 pmsg->prefix_pad2 = 0;
6027 pmsg->prefix_ifindex = idev->dev->ifindex;
6028 pmsg->prefix_len = pinfo->prefix_len;
6029 pmsg->prefix_type = pinfo->type;
6030 pmsg->prefix_pad3 = 0;
6031 pmsg->prefix_flags = 0;
6032 if (pinfo->onlink)
6033 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
6034 if (pinfo->autoconf)
6035 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
6036
6037 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
6038 goto nla_put_failure;
6039 ci.preferred_time = ntohl(pinfo->prefered);
6040 ci.valid_time = ntohl(pinfo->valid);
6041 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
6042 goto nla_put_failure;
6043 nlmsg_end(skb, nlh);
6044 return 0;
6045
6046 nla_put_failure:
6047 nlmsg_cancel(skb, nlh);
6048 return -EMSGSIZE;
6049 }
6050
inet6_prefix_notify(int event,struct inet6_dev * idev,struct prefix_info * pinfo)6051 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
6052 struct prefix_info *pinfo)
6053 {
6054 struct sk_buff *skb;
6055 struct net *net = dev_net(idev->dev);
6056 int err = -ENOBUFS;
6057
6058 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
6059 if (!skb)
6060 goto errout;
6061
6062 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
6063 if (err < 0) {
6064 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
6065 WARN_ON(err == -EMSGSIZE);
6066 kfree_skb(skb);
6067 goto errout;
6068 }
6069 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
6070 return;
6071 errout:
6072 if (err < 0)
6073 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6074 }
6075
__ipv6_ifa_notify(int event,struct inet6_ifaddr * ifp)6076 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6077 {
6078 struct net *net = dev_net(ifp->idev->dev);
6079
6080 if (event)
6081 ASSERT_RTNL();
6082
6083 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6084
6085 switch (event) {
6086 case RTM_NEWADDR:
6087 /*
6088 * If the address was optimistic we inserted the route at the
6089 * start of our DAD process, so we don't need to do it again.
6090 * If the device was taken down in the middle of the DAD
6091 * cycle there is a race where we could get here without a
6092 * host route, so nothing to insert. That will be fixed when
6093 * the device is brought up.
6094 */
6095 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6096 ip6_ins_rt(net, ifp->rt);
6097 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6098 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6099 &ifp->addr, ifp->idev->dev->name);
6100 }
6101
6102 if (ifp->idev->cnf.forwarding)
6103 addrconf_join_anycast(ifp);
6104 if (!ipv6_addr_any(&ifp->peer_addr))
6105 addrconf_prefix_route(&ifp->peer_addr, 128,
6106 ifp->rt_priority, ifp->idev->dev,
6107 0, 0, GFP_ATOMIC);
6108 break;
6109 case RTM_DELADDR:
6110 if (ifp->idev->cnf.forwarding)
6111 addrconf_leave_anycast(ifp);
6112 addrconf_leave_solict(ifp->idev, &ifp->addr);
6113 if (!ipv6_addr_any(&ifp->peer_addr)) {
6114 struct fib6_info *rt;
6115
6116 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6117 ifp->idev->dev, 0, 0,
6118 false);
6119 if (rt)
6120 ip6_del_rt(net, rt, false);
6121 }
6122 if (ifp->rt) {
6123 ip6_del_rt(net, ifp->rt, false);
6124 ifp->rt = NULL;
6125 }
6126 rt_genid_bump_ipv6(net);
6127 break;
6128 }
6129 atomic_inc(&net->ipv6.dev_addr_genid);
6130 }
6131
ipv6_ifa_notify(int event,struct inet6_ifaddr * ifp)6132 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6133 {
6134 rcu_read_lock_bh();
6135 if (likely(ifp->idev->dead == 0))
6136 __ipv6_ifa_notify(event, ifp);
6137 rcu_read_unlock_bh();
6138 }
6139
6140 #ifdef CONFIG_SYSCTL
6141
addrconf_sysctl_forward(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6142 static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6143 void *buffer, size_t *lenp, loff_t *ppos)
6144 {
6145 int *valp = ctl->data;
6146 int val = *valp;
6147 loff_t pos = *ppos;
6148 struct ctl_table lctl;
6149 int ret;
6150
6151 /*
6152 * ctl->data points to idev->cnf.forwarding, we should
6153 * not modify it until we get the rtnl lock.
6154 */
6155 lctl = *ctl;
6156 lctl.data = &val;
6157
6158 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6159
6160 if (write)
6161 ret = addrconf_fixup_forwarding(ctl, valp, val);
6162 if (ret)
6163 *ppos = pos;
6164 return ret;
6165 }
6166
addrconf_sysctl_mtu(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6167 static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6168 void *buffer, size_t *lenp, loff_t *ppos)
6169 {
6170 struct inet6_dev *idev = ctl->extra1;
6171 int min_mtu = IPV6_MIN_MTU;
6172 struct ctl_table lctl;
6173
6174 lctl = *ctl;
6175 lctl.extra1 = &min_mtu;
6176 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6177
6178 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6179 }
6180
dev_disable_change(struct inet6_dev * idev)6181 static void dev_disable_change(struct inet6_dev *idev)
6182 {
6183 struct netdev_notifier_info info;
6184
6185 if (!idev || !idev->dev)
6186 return;
6187
6188 netdev_notifier_info_init(&info, idev->dev);
6189 if (idev->cnf.disable_ipv6)
6190 addrconf_notify(NULL, NETDEV_DOWN, &info);
6191 else
6192 addrconf_notify(NULL, NETDEV_UP, &info);
6193 }
6194
addrconf_disable_change(struct net * net,__s32 newf)6195 static void addrconf_disable_change(struct net *net, __s32 newf)
6196 {
6197 struct net_device *dev;
6198 struct inet6_dev *idev;
6199
6200 for_each_netdev(net, dev) {
6201 idev = __in6_dev_get(dev);
6202 if (idev) {
6203 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6204 idev->cnf.disable_ipv6 = newf;
6205 if (changed)
6206 dev_disable_change(idev);
6207 }
6208 }
6209 }
6210
addrconf_disable_ipv6(struct ctl_table * table,int * p,int newf)6211 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6212 {
6213 struct net *net;
6214 int old;
6215
6216 if (!rtnl_trylock())
6217 return restart_syscall();
6218
6219 net = (struct net *)table->extra2;
6220 old = *p;
6221 *p = newf;
6222
6223 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6224 rtnl_unlock();
6225 return 0;
6226 }
6227
6228 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6229 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6230 addrconf_disable_change(net, newf);
6231 } else if ((!newf) ^ (!old))
6232 dev_disable_change((struct inet6_dev *)table->extra1);
6233
6234 rtnl_unlock();
6235 return 0;
6236 }
6237
addrconf_sysctl_disable(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6238 static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6239 void *buffer, size_t *lenp, loff_t *ppos)
6240 {
6241 int *valp = ctl->data;
6242 int val = *valp;
6243 loff_t pos = *ppos;
6244 struct ctl_table lctl;
6245 int ret;
6246
6247 /*
6248 * ctl->data points to idev->cnf.disable_ipv6, we should
6249 * not modify it until we get the rtnl lock.
6250 */
6251 lctl = *ctl;
6252 lctl.data = &val;
6253
6254 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6255
6256 if (write)
6257 ret = addrconf_disable_ipv6(ctl, valp, val);
6258 if (ret)
6259 *ppos = pos;
6260 return ret;
6261 }
6262
addrconf_sysctl_proxy_ndp(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6263 static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6264 void *buffer, size_t *lenp, loff_t *ppos)
6265 {
6266 int *valp = ctl->data;
6267 int ret;
6268 int old, new;
6269
6270 old = *valp;
6271 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6272 new = *valp;
6273
6274 if (write && old != new) {
6275 struct net *net = ctl->extra2;
6276
6277 if (!rtnl_trylock())
6278 return restart_syscall();
6279
6280 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6281 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6282 NETCONFA_PROXY_NEIGH,
6283 NETCONFA_IFINDEX_DEFAULT,
6284 net->ipv6.devconf_dflt);
6285 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6286 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6287 NETCONFA_PROXY_NEIGH,
6288 NETCONFA_IFINDEX_ALL,
6289 net->ipv6.devconf_all);
6290 else {
6291 struct inet6_dev *idev = ctl->extra1;
6292
6293 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6294 NETCONFA_PROXY_NEIGH,
6295 idev->dev->ifindex,
6296 &idev->cnf);
6297 }
6298 rtnl_unlock();
6299 }
6300
6301 return ret;
6302 }
6303
addrconf_sysctl_addr_gen_mode(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6304 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6305 void *buffer, size_t *lenp,
6306 loff_t *ppos)
6307 {
6308 int ret = 0;
6309 u32 new_val;
6310 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6311 struct net *net = (struct net *)ctl->extra2;
6312 struct ctl_table tmp = {
6313 .data = &new_val,
6314 .maxlen = sizeof(new_val),
6315 .mode = ctl->mode,
6316 };
6317
6318 if (!rtnl_trylock())
6319 return restart_syscall();
6320
6321 new_val = *((u32 *)ctl->data);
6322
6323 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6324 if (ret != 0)
6325 goto out;
6326
6327 if (write) {
6328 if (check_addr_gen_mode(new_val) < 0) {
6329 ret = -EINVAL;
6330 goto out;
6331 }
6332
6333 if (idev) {
6334 if (check_stable_privacy(idev, net, new_val) < 0) {
6335 ret = -EINVAL;
6336 goto out;
6337 }
6338
6339 if (idev->cnf.addr_gen_mode != new_val) {
6340 idev->cnf.addr_gen_mode = new_val;
6341 addrconf_dev_config(idev->dev);
6342 }
6343 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6344 struct net_device *dev;
6345
6346 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6347 for_each_netdev(net, dev) {
6348 idev = __in6_dev_get(dev);
6349 if (idev &&
6350 idev->cnf.addr_gen_mode != new_val) {
6351 idev->cnf.addr_gen_mode = new_val;
6352 addrconf_dev_config(idev->dev);
6353 }
6354 }
6355 }
6356
6357 *((u32 *)ctl->data) = new_val;
6358 }
6359
6360 out:
6361 rtnl_unlock();
6362
6363 return ret;
6364 }
6365
addrconf_sysctl_stable_secret(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6366 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6367 void *buffer, size_t *lenp,
6368 loff_t *ppos)
6369 {
6370 int err;
6371 struct in6_addr addr;
6372 char str[IPV6_MAX_STRLEN];
6373 struct ctl_table lctl = *ctl;
6374 struct net *net = ctl->extra2;
6375 struct ipv6_stable_secret *secret = ctl->data;
6376
6377 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6378 return -EIO;
6379
6380 lctl.maxlen = IPV6_MAX_STRLEN;
6381 lctl.data = str;
6382
6383 if (!rtnl_trylock())
6384 return restart_syscall();
6385
6386 if (!write && !secret->initialized) {
6387 err = -EIO;
6388 goto out;
6389 }
6390
6391 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6392 if (err >= sizeof(str)) {
6393 err = -EIO;
6394 goto out;
6395 }
6396
6397 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6398 if (err || !write)
6399 goto out;
6400
6401 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6402 err = -EIO;
6403 goto out;
6404 }
6405
6406 secret->initialized = true;
6407 secret->secret = addr;
6408
6409 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6410 struct net_device *dev;
6411
6412 for_each_netdev(net, dev) {
6413 struct inet6_dev *idev = __in6_dev_get(dev);
6414
6415 if (idev) {
6416 idev->cnf.addr_gen_mode =
6417 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6418 }
6419 }
6420 } else {
6421 struct inet6_dev *idev = ctl->extra1;
6422
6423 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6424 }
6425
6426 out:
6427 rtnl_unlock();
6428
6429 return err;
6430 }
6431
6432 static
addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6433 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6434 int write, void *buffer,
6435 size_t *lenp,
6436 loff_t *ppos)
6437 {
6438 int *valp = ctl->data;
6439 int val = *valp;
6440 loff_t pos = *ppos;
6441 struct ctl_table lctl;
6442 int ret;
6443
6444 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6445 * we should not modify it until we get the rtnl lock.
6446 */
6447 lctl = *ctl;
6448 lctl.data = &val;
6449
6450 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6451
6452 if (write)
6453 ret = addrconf_fixup_linkdown(ctl, valp, val);
6454 if (ret)
6455 *ppos = pos;
6456 return ret;
6457 }
6458
6459 static
addrconf_set_nopolicy(struct rt6_info * rt,int action)6460 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6461 {
6462 if (rt) {
6463 if (action)
6464 rt->dst.flags |= DST_NOPOLICY;
6465 else
6466 rt->dst.flags &= ~DST_NOPOLICY;
6467 }
6468 }
6469
6470 static
addrconf_disable_policy_idev(struct inet6_dev * idev,int val)6471 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6472 {
6473 struct inet6_ifaddr *ifa;
6474
6475 read_lock_bh(&idev->lock);
6476 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6477 spin_lock(&ifa->lock);
6478 if (ifa->rt) {
6479 /* host routes only use builtin fib6_nh */
6480 struct fib6_nh *nh = ifa->rt->fib6_nh;
6481 int cpu;
6482
6483 rcu_read_lock();
6484 ifa->rt->dst_nopolicy = val ? true : false;
6485 if (nh->rt6i_pcpu) {
6486 for_each_possible_cpu(cpu) {
6487 struct rt6_info **rtp;
6488
6489 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6490 addrconf_set_nopolicy(*rtp, val);
6491 }
6492 }
6493 rcu_read_unlock();
6494 }
6495 spin_unlock(&ifa->lock);
6496 }
6497 read_unlock_bh(&idev->lock);
6498 }
6499
6500 static
addrconf_disable_policy(struct ctl_table * ctl,int * valp,int val)6501 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6502 {
6503 struct inet6_dev *idev;
6504 struct net *net;
6505
6506 if (!rtnl_trylock())
6507 return restart_syscall();
6508
6509 *valp = val;
6510
6511 net = (struct net *)ctl->extra2;
6512 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6513 rtnl_unlock();
6514 return 0;
6515 }
6516
6517 if (valp == &net->ipv6.devconf_all->disable_policy) {
6518 struct net_device *dev;
6519
6520 for_each_netdev(net, dev) {
6521 idev = __in6_dev_get(dev);
6522 if (idev)
6523 addrconf_disable_policy_idev(idev, val);
6524 }
6525 } else {
6526 idev = (struct inet6_dev *)ctl->extra1;
6527 addrconf_disable_policy_idev(idev, val);
6528 }
6529
6530 rtnl_unlock();
6531 return 0;
6532 }
6533
addrconf_sysctl_disable_policy(struct ctl_table * ctl,int write,void * buffer,size_t * lenp,loff_t * ppos)6534 static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6535 void *buffer, size_t *lenp, loff_t *ppos)
6536 {
6537 int *valp = ctl->data;
6538 int val = *valp;
6539 loff_t pos = *ppos;
6540 struct ctl_table lctl;
6541 int ret;
6542
6543 lctl = *ctl;
6544 lctl.data = &val;
6545 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6546
6547 if (write && (*valp != val))
6548 ret = addrconf_disable_policy(ctl, valp, val);
6549
6550 if (ret)
6551 *ppos = pos;
6552
6553 return ret;
6554 }
6555
6556 static int minus_one = -1;
6557 static const int two_five_five = 255;
6558
6559 static const struct ctl_table addrconf_sysctl[] = {
6560 {
6561 .procname = "forwarding",
6562 .data = &ipv6_devconf.forwarding,
6563 .maxlen = sizeof(int),
6564 .mode = 0644,
6565 .proc_handler = addrconf_sysctl_forward,
6566 },
6567 {
6568 .procname = "hop_limit",
6569 .data = &ipv6_devconf.hop_limit,
6570 .maxlen = sizeof(int),
6571 .mode = 0644,
6572 .proc_handler = proc_dointvec_minmax,
6573 .extra1 = (void *)SYSCTL_ONE,
6574 .extra2 = (void *)&two_five_five,
6575 },
6576 {
6577 .procname = "mtu",
6578 .data = &ipv6_devconf.mtu6,
6579 .maxlen = sizeof(int),
6580 .mode = 0644,
6581 .proc_handler = addrconf_sysctl_mtu,
6582 },
6583 {
6584 .procname = "accept_ra",
6585 .data = &ipv6_devconf.accept_ra,
6586 .maxlen = sizeof(int),
6587 .mode = 0644,
6588 .proc_handler = proc_dointvec,
6589 },
6590 {
6591 .procname = "accept_redirects",
6592 .data = &ipv6_devconf.accept_redirects,
6593 .maxlen = sizeof(int),
6594 .mode = 0644,
6595 .proc_handler = proc_dointvec,
6596 },
6597 {
6598 .procname = "autoconf",
6599 .data = &ipv6_devconf.autoconf,
6600 .maxlen = sizeof(int),
6601 .mode = 0644,
6602 .proc_handler = proc_dointvec,
6603 },
6604 {
6605 .procname = "dad_transmits",
6606 .data = &ipv6_devconf.dad_transmits,
6607 .maxlen = sizeof(int),
6608 .mode = 0644,
6609 .proc_handler = proc_dointvec,
6610 },
6611 {
6612 .procname = "router_solicitations",
6613 .data = &ipv6_devconf.rtr_solicits,
6614 .maxlen = sizeof(int),
6615 .mode = 0644,
6616 .proc_handler = proc_dointvec_minmax,
6617 .extra1 = &minus_one,
6618 },
6619 {
6620 .procname = "router_solicitation_interval",
6621 .data = &ipv6_devconf.rtr_solicit_interval,
6622 .maxlen = sizeof(int),
6623 .mode = 0644,
6624 .proc_handler = proc_dointvec_jiffies,
6625 },
6626 {
6627 .procname = "router_solicitation_max_interval",
6628 .data = &ipv6_devconf.rtr_solicit_max_interval,
6629 .maxlen = sizeof(int),
6630 .mode = 0644,
6631 .proc_handler = proc_dointvec_jiffies,
6632 },
6633 {
6634 .procname = "router_solicitation_delay",
6635 .data = &ipv6_devconf.rtr_solicit_delay,
6636 .maxlen = sizeof(int),
6637 .mode = 0644,
6638 .proc_handler = proc_dointvec_jiffies,
6639 },
6640 {
6641 .procname = "force_mld_version",
6642 .data = &ipv6_devconf.force_mld_version,
6643 .maxlen = sizeof(int),
6644 .mode = 0644,
6645 .proc_handler = proc_dointvec,
6646 },
6647 {
6648 .procname = "mldv1_unsolicited_report_interval",
6649 .data =
6650 &ipv6_devconf.mldv1_unsolicited_report_interval,
6651 .maxlen = sizeof(int),
6652 .mode = 0644,
6653 .proc_handler = proc_dointvec_ms_jiffies,
6654 },
6655 {
6656 .procname = "mldv2_unsolicited_report_interval",
6657 .data =
6658 &ipv6_devconf.mldv2_unsolicited_report_interval,
6659 .maxlen = sizeof(int),
6660 .mode = 0644,
6661 .proc_handler = proc_dointvec_ms_jiffies,
6662 },
6663 {
6664 .procname = "use_tempaddr",
6665 .data = &ipv6_devconf.use_tempaddr,
6666 .maxlen = sizeof(int),
6667 .mode = 0644,
6668 .proc_handler = proc_dointvec,
6669 },
6670 {
6671 .procname = "temp_valid_lft",
6672 .data = &ipv6_devconf.temp_valid_lft,
6673 .maxlen = sizeof(int),
6674 .mode = 0644,
6675 .proc_handler = proc_dointvec,
6676 },
6677 {
6678 .procname = "temp_prefered_lft",
6679 .data = &ipv6_devconf.temp_prefered_lft,
6680 .maxlen = sizeof(int),
6681 .mode = 0644,
6682 .proc_handler = proc_dointvec,
6683 },
6684 {
6685 .procname = "regen_max_retry",
6686 .data = &ipv6_devconf.regen_max_retry,
6687 .maxlen = sizeof(int),
6688 .mode = 0644,
6689 .proc_handler = proc_dointvec,
6690 },
6691 {
6692 .procname = "max_desync_factor",
6693 .data = &ipv6_devconf.max_desync_factor,
6694 .maxlen = sizeof(int),
6695 .mode = 0644,
6696 .proc_handler = proc_dointvec,
6697 },
6698 {
6699 .procname = "max_addresses",
6700 .data = &ipv6_devconf.max_addresses,
6701 .maxlen = sizeof(int),
6702 .mode = 0644,
6703 .proc_handler = proc_dointvec,
6704 },
6705 {
6706 .procname = "accept_ra_defrtr",
6707 .data = &ipv6_devconf.accept_ra_defrtr,
6708 .maxlen = sizeof(int),
6709 .mode = 0644,
6710 .proc_handler = proc_dointvec,
6711 },
6712 {
6713 .procname = "accept_ra_min_hop_limit",
6714 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6715 .maxlen = sizeof(int),
6716 .mode = 0644,
6717 .proc_handler = proc_dointvec,
6718 },
6719 {
6720 .procname = "accept_ra_pinfo",
6721 .data = &ipv6_devconf.accept_ra_pinfo,
6722 .maxlen = sizeof(int),
6723 .mode = 0644,
6724 .proc_handler = proc_dointvec,
6725 },
6726 #ifdef CONFIG_IPV6_ROUTER_PREF
6727 {
6728 .procname = "accept_ra_rtr_pref",
6729 .data = &ipv6_devconf.accept_ra_rtr_pref,
6730 .maxlen = sizeof(int),
6731 .mode = 0644,
6732 .proc_handler = proc_dointvec,
6733 },
6734 {
6735 .procname = "router_probe_interval",
6736 .data = &ipv6_devconf.rtr_probe_interval,
6737 .maxlen = sizeof(int),
6738 .mode = 0644,
6739 .proc_handler = proc_dointvec_jiffies,
6740 },
6741 #ifdef CONFIG_IPV6_ROUTE_INFO
6742 {
6743 .procname = "accept_ra_rt_info_min_plen",
6744 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6745 .maxlen = sizeof(int),
6746 .mode = 0644,
6747 .proc_handler = proc_dointvec,
6748 },
6749 {
6750 .procname = "accept_ra_rt_info_max_plen",
6751 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6752 .maxlen = sizeof(int),
6753 .mode = 0644,
6754 .proc_handler = proc_dointvec,
6755 },
6756 #endif
6757 #endif
6758 {
6759 .procname = "proxy_ndp",
6760 .data = &ipv6_devconf.proxy_ndp,
6761 .maxlen = sizeof(int),
6762 .mode = 0644,
6763 .proc_handler = addrconf_sysctl_proxy_ndp,
6764 },
6765 {
6766 .procname = "accept_source_route",
6767 .data = &ipv6_devconf.accept_source_route,
6768 .maxlen = sizeof(int),
6769 .mode = 0644,
6770 .proc_handler = proc_dointvec,
6771 },
6772 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6773 {
6774 .procname = "optimistic_dad",
6775 .data = &ipv6_devconf.optimistic_dad,
6776 .maxlen = sizeof(int),
6777 .mode = 0644,
6778 .proc_handler = proc_dointvec,
6779 },
6780 {
6781 .procname = "use_optimistic",
6782 .data = &ipv6_devconf.use_optimistic,
6783 .maxlen = sizeof(int),
6784 .mode = 0644,
6785 .proc_handler = proc_dointvec,
6786 },
6787 #endif
6788 #ifdef CONFIG_IPV6_MROUTE
6789 {
6790 .procname = "mc_forwarding",
6791 .data = &ipv6_devconf.mc_forwarding,
6792 .maxlen = sizeof(int),
6793 .mode = 0444,
6794 .proc_handler = proc_dointvec,
6795 },
6796 #endif
6797 {
6798 .procname = "disable_ipv6",
6799 .data = &ipv6_devconf.disable_ipv6,
6800 .maxlen = sizeof(int),
6801 .mode = 0644,
6802 .proc_handler = addrconf_sysctl_disable,
6803 },
6804 {
6805 .procname = "accept_dad",
6806 .data = &ipv6_devconf.accept_dad,
6807 .maxlen = sizeof(int),
6808 .mode = 0644,
6809 .proc_handler = proc_dointvec,
6810 },
6811 {
6812 .procname = "force_tllao",
6813 .data = &ipv6_devconf.force_tllao,
6814 .maxlen = sizeof(int),
6815 .mode = 0644,
6816 .proc_handler = proc_dointvec
6817 },
6818 {
6819 .procname = "ndisc_notify",
6820 .data = &ipv6_devconf.ndisc_notify,
6821 .maxlen = sizeof(int),
6822 .mode = 0644,
6823 .proc_handler = proc_dointvec
6824 },
6825 {
6826 .procname = "suppress_frag_ndisc",
6827 .data = &ipv6_devconf.suppress_frag_ndisc,
6828 .maxlen = sizeof(int),
6829 .mode = 0644,
6830 .proc_handler = proc_dointvec
6831 },
6832 {
6833 .procname = "accept_ra_from_local",
6834 .data = &ipv6_devconf.accept_ra_from_local,
6835 .maxlen = sizeof(int),
6836 .mode = 0644,
6837 .proc_handler = proc_dointvec,
6838 },
6839 {
6840 .procname = "accept_ra_mtu",
6841 .data = &ipv6_devconf.accept_ra_mtu,
6842 .maxlen = sizeof(int),
6843 .mode = 0644,
6844 .proc_handler = proc_dointvec,
6845 },
6846 {
6847 .procname = "stable_secret",
6848 .data = &ipv6_devconf.stable_secret,
6849 .maxlen = IPV6_MAX_STRLEN,
6850 .mode = 0600,
6851 .proc_handler = addrconf_sysctl_stable_secret,
6852 },
6853 {
6854 .procname = "use_oif_addrs_only",
6855 .data = &ipv6_devconf.use_oif_addrs_only,
6856 .maxlen = sizeof(int),
6857 .mode = 0644,
6858 .proc_handler = proc_dointvec,
6859 },
6860 {
6861 .procname = "ignore_routes_with_linkdown",
6862 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6863 .maxlen = sizeof(int),
6864 .mode = 0644,
6865 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6866 },
6867 {
6868 .procname = "drop_unicast_in_l2_multicast",
6869 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6870 .maxlen = sizeof(int),
6871 .mode = 0644,
6872 .proc_handler = proc_dointvec,
6873 },
6874 {
6875 .procname = "drop_unsolicited_na",
6876 .data = &ipv6_devconf.drop_unsolicited_na,
6877 .maxlen = sizeof(int),
6878 .mode = 0644,
6879 .proc_handler = proc_dointvec,
6880 },
6881 {
6882 .procname = "keep_addr_on_down",
6883 .data = &ipv6_devconf.keep_addr_on_down,
6884 .maxlen = sizeof(int),
6885 .mode = 0644,
6886 .proc_handler = proc_dointvec,
6887
6888 },
6889 {
6890 .procname = "seg6_enabled",
6891 .data = &ipv6_devconf.seg6_enabled,
6892 .maxlen = sizeof(int),
6893 .mode = 0644,
6894 .proc_handler = proc_dointvec,
6895 },
6896 #ifdef CONFIG_IPV6_SEG6_HMAC
6897 {
6898 .procname = "seg6_require_hmac",
6899 .data = &ipv6_devconf.seg6_require_hmac,
6900 .maxlen = sizeof(int),
6901 .mode = 0644,
6902 .proc_handler = proc_dointvec,
6903 },
6904 #endif
6905 {
6906 .procname = "enhanced_dad",
6907 .data = &ipv6_devconf.enhanced_dad,
6908 .maxlen = sizeof(int),
6909 .mode = 0644,
6910 .proc_handler = proc_dointvec,
6911 },
6912 {
6913 .procname = "addr_gen_mode",
6914 .data = &ipv6_devconf.addr_gen_mode,
6915 .maxlen = sizeof(int),
6916 .mode = 0644,
6917 .proc_handler = addrconf_sysctl_addr_gen_mode,
6918 },
6919 {
6920 .procname = "disable_policy",
6921 .data = &ipv6_devconf.disable_policy,
6922 .maxlen = sizeof(int),
6923 .mode = 0644,
6924 .proc_handler = addrconf_sysctl_disable_policy,
6925 },
6926 {
6927 .procname = "ndisc_tclass",
6928 .data = &ipv6_devconf.ndisc_tclass,
6929 .maxlen = sizeof(int),
6930 .mode = 0644,
6931 .proc_handler = proc_dointvec_minmax,
6932 .extra1 = (void *)SYSCTL_ZERO,
6933 .extra2 = (void *)&two_five_five,
6934 },
6935 {
6936 .procname = "rpl_seg_enabled",
6937 .data = &ipv6_devconf.rpl_seg_enabled,
6938 .maxlen = sizeof(int),
6939 .mode = 0644,
6940 .proc_handler = proc_dointvec,
6941 },
6942 {
6943 /* sentinel */
6944 }
6945 };
6946
__addrconf_sysctl_register(struct net * net,char * dev_name,struct inet6_dev * idev,struct ipv6_devconf * p)6947 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6948 struct inet6_dev *idev, struct ipv6_devconf *p)
6949 {
6950 int i, ifindex;
6951 struct ctl_table *table;
6952 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6953
6954 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6955 if (!table)
6956 goto out;
6957
6958 for (i = 0; table[i].data; i++) {
6959 table[i].data += (char *)p - (char *)&ipv6_devconf;
6960 /* If one of these is already set, then it is not safe to
6961 * overwrite either of them: this makes proc_dointvec_minmax
6962 * usable.
6963 */
6964 if (!table[i].extra1 && !table[i].extra2) {
6965 table[i].extra1 = idev; /* embedded; no ref */
6966 table[i].extra2 = net;
6967 }
6968 }
6969
6970 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6971
6972 p->sysctl_header = register_net_sysctl(net, path, table);
6973 if (!p->sysctl_header)
6974 goto free;
6975
6976 if (!strcmp(dev_name, "all"))
6977 ifindex = NETCONFA_IFINDEX_ALL;
6978 else if (!strcmp(dev_name, "default"))
6979 ifindex = NETCONFA_IFINDEX_DEFAULT;
6980 else
6981 ifindex = idev->dev->ifindex;
6982 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6983 ifindex, p);
6984 return 0;
6985
6986 free:
6987 kfree(table);
6988 out:
6989 return -ENOBUFS;
6990 }
6991
__addrconf_sysctl_unregister(struct net * net,struct ipv6_devconf * p,int ifindex)6992 static void __addrconf_sysctl_unregister(struct net *net,
6993 struct ipv6_devconf *p, int ifindex)
6994 {
6995 struct ctl_table *table;
6996
6997 if (!p->sysctl_header)
6998 return;
6999
7000 table = p->sysctl_header->ctl_table_arg;
7001 unregister_net_sysctl_table(p->sysctl_header);
7002 p->sysctl_header = NULL;
7003 kfree(table);
7004
7005 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
7006 }
7007
addrconf_sysctl_register(struct inet6_dev * idev)7008 static int addrconf_sysctl_register(struct inet6_dev *idev)
7009 {
7010 int err;
7011
7012 if (!sysctl_dev_name_is_allowed(idev->dev->name))
7013 return -EINVAL;
7014
7015 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
7016 &ndisc_ifinfo_sysctl_change);
7017 if (err)
7018 return err;
7019 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
7020 idev, &idev->cnf);
7021 if (err)
7022 neigh_sysctl_unregister(idev->nd_parms);
7023
7024 return err;
7025 }
7026
addrconf_sysctl_unregister(struct inet6_dev * idev)7027 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
7028 {
7029 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
7030 idev->dev->ifindex);
7031 neigh_sysctl_unregister(idev->nd_parms);
7032 }
7033
7034
7035 #endif
7036
addrconf_init_net(struct net * net)7037 static int __net_init addrconf_init_net(struct net *net)
7038 {
7039 int err = -ENOMEM;
7040 struct ipv6_devconf *all, *dflt;
7041
7042 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
7043 if (!all)
7044 goto err_alloc_all;
7045
7046 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
7047 if (!dflt)
7048 goto err_alloc_dflt;
7049
7050 if (!net_eq(net, &init_net)) {
7051 switch (net_inherit_devconf()) {
7052 case 1: /* copy from init_net */
7053 memcpy(all, init_net.ipv6.devconf_all,
7054 sizeof(ipv6_devconf));
7055 memcpy(dflt, init_net.ipv6.devconf_dflt,
7056 sizeof(ipv6_devconf_dflt));
7057 break;
7058 case 3: /* copy from the current netns */
7059 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
7060 sizeof(ipv6_devconf));
7061 memcpy(dflt,
7062 current->nsproxy->net_ns->ipv6.devconf_dflt,
7063 sizeof(ipv6_devconf_dflt));
7064 break;
7065 case 0:
7066 case 2:
7067 /* use compiled values */
7068 break;
7069 }
7070 }
7071
7072 /* these will be inherited by all namespaces */
7073 dflt->autoconf = ipv6_defaults.autoconf;
7074 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7075
7076 dflt->stable_secret.initialized = false;
7077 all->stable_secret.initialized = false;
7078
7079 net->ipv6.devconf_all = all;
7080 net->ipv6.devconf_dflt = dflt;
7081
7082 #ifdef CONFIG_SYSCTL
7083 err = __addrconf_sysctl_register(net, "all", NULL, all);
7084 if (err < 0)
7085 goto err_reg_all;
7086
7087 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7088 if (err < 0)
7089 goto err_reg_dflt;
7090 #endif
7091 return 0;
7092
7093 #ifdef CONFIG_SYSCTL
7094 err_reg_dflt:
7095 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7096 err_reg_all:
7097 kfree(dflt);
7098 #endif
7099 err_alloc_dflt:
7100 kfree(all);
7101 err_alloc_all:
7102 return err;
7103 }
7104
addrconf_exit_net(struct net * net)7105 static void __net_exit addrconf_exit_net(struct net *net)
7106 {
7107 #ifdef CONFIG_SYSCTL
7108 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7109 NETCONFA_IFINDEX_DEFAULT);
7110 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7111 NETCONFA_IFINDEX_ALL);
7112 #endif
7113 kfree(net->ipv6.devconf_dflt);
7114 kfree(net->ipv6.devconf_all);
7115 }
7116
7117 static struct pernet_operations addrconf_ops = {
7118 .init = addrconf_init_net,
7119 .exit = addrconf_exit_net,
7120 };
7121
7122 static struct rtnl_af_ops inet6_ops __read_mostly = {
7123 .family = AF_INET6,
7124 .fill_link_af = inet6_fill_link_af,
7125 .get_link_af_size = inet6_get_link_af_size,
7126 .validate_link_af = inet6_validate_link_af,
7127 .set_link_af = inet6_set_link_af,
7128 };
7129
7130 /*
7131 * Init / cleanup code
7132 */
7133
addrconf_init(void)7134 int __init addrconf_init(void)
7135 {
7136 struct inet6_dev *idev;
7137 int i, err;
7138
7139 err = ipv6_addr_label_init();
7140 if (err < 0) {
7141 pr_crit("%s: cannot initialize default policy table: %d\n",
7142 __func__, err);
7143 goto out;
7144 }
7145
7146 err = register_pernet_subsys(&addrconf_ops);
7147 if (err < 0)
7148 goto out_addrlabel;
7149
7150 addrconf_wq = create_workqueue("ipv6_addrconf");
7151 if (!addrconf_wq) {
7152 err = -ENOMEM;
7153 goto out_nowq;
7154 }
7155
7156 /* The addrconf netdev notifier requires that loopback_dev
7157 * has it's ipv6 private information allocated and setup
7158 * before it can bring up and give link-local addresses
7159 * to other devices which are up.
7160 *
7161 * Unfortunately, loopback_dev is not necessarily the first
7162 * entry in the global dev_base list of net devices. In fact,
7163 * it is likely to be the very last entry on that list.
7164 * So this causes the notifier registry below to try and
7165 * give link-local addresses to all devices besides loopback_dev
7166 * first, then loopback_dev, which cases all the non-loopback_dev
7167 * devices to fail to get a link-local address.
7168 *
7169 * So, as a temporary fix, allocate the ipv6 structure for
7170 * loopback_dev first by hand.
7171 * Longer term, all of the dependencies ipv6 has upon the loopback
7172 * device and it being up should be removed.
7173 */
7174 rtnl_lock();
7175 idev = ipv6_add_dev(init_net.loopback_dev);
7176 rtnl_unlock();
7177 if (IS_ERR(idev)) {
7178 err = PTR_ERR(idev);
7179 goto errlo;
7180 }
7181
7182 ip6_route_init_special_entries();
7183
7184 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7185 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7186
7187 register_netdevice_notifier(&ipv6_dev_notf);
7188
7189 addrconf_verify();
7190
7191 rtnl_af_register(&inet6_ops);
7192
7193 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7194 NULL, inet6_dump_ifinfo, 0);
7195 if (err < 0)
7196 goto errout;
7197
7198 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7199 inet6_rtm_newaddr, NULL, 0);
7200 if (err < 0)
7201 goto errout;
7202 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7203 inet6_rtm_deladdr, NULL, 0);
7204 if (err < 0)
7205 goto errout;
7206 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7207 inet6_rtm_getaddr, inet6_dump_ifaddr,
7208 RTNL_FLAG_DOIT_UNLOCKED);
7209 if (err < 0)
7210 goto errout;
7211 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7212 NULL, inet6_dump_ifmcaddr, 0);
7213 if (err < 0)
7214 goto errout;
7215 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7216 NULL, inet6_dump_ifacaddr, 0);
7217 if (err < 0)
7218 goto errout;
7219 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7220 inet6_netconf_get_devconf,
7221 inet6_netconf_dump_devconf,
7222 RTNL_FLAG_DOIT_UNLOCKED);
7223 if (err < 0)
7224 goto errout;
7225 err = ipv6_addr_label_rtnl_register();
7226 if (err < 0)
7227 goto errout;
7228
7229 return 0;
7230 errout:
7231 rtnl_unregister_all(PF_INET6);
7232 rtnl_af_unregister(&inet6_ops);
7233 unregister_netdevice_notifier(&ipv6_dev_notf);
7234 errlo:
7235 destroy_workqueue(addrconf_wq);
7236 out_nowq:
7237 unregister_pernet_subsys(&addrconf_ops);
7238 out_addrlabel:
7239 ipv6_addr_label_cleanup();
7240 out:
7241 return err;
7242 }
7243
addrconf_cleanup(void)7244 void addrconf_cleanup(void)
7245 {
7246 struct net_device *dev;
7247 int i;
7248
7249 unregister_netdevice_notifier(&ipv6_dev_notf);
7250 unregister_pernet_subsys(&addrconf_ops);
7251 ipv6_addr_label_cleanup();
7252
7253 rtnl_af_unregister(&inet6_ops);
7254
7255 rtnl_lock();
7256
7257 /* clean dev list */
7258 for_each_netdev(&init_net, dev) {
7259 if (__in6_dev_get(dev) == NULL)
7260 continue;
7261 addrconf_ifdown(dev, true);
7262 }
7263 addrconf_ifdown(init_net.loopback_dev, true);
7264
7265 /*
7266 * Check hash table.
7267 */
7268 spin_lock_bh(&addrconf_hash_lock);
7269 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7270 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7271 spin_unlock_bh(&addrconf_hash_lock);
7272 cancel_delayed_work(&addr_chk_work);
7273 rtnl_unlock();
7274
7275 destroy_workqueue(addrconf_wq);
7276 }
7277