?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'mips_fixes_5.2_2' of git://git.kernel.org/pub/scm/linux/kernel/git/mips...
[linux-2.6/linux-2.6-arm.git] / net / ipv6 / addrconf.c
blob081bb517e40d6677389cfca11fc567c5f6043eb7
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
98 static inline u32 cstamp_delta(unsigned long cstamp)
99 {
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101 }
102
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
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
128 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
129 {
130 return 0;
131 }
132
133 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134 {
135 }
136 #endif
137
138 static void ipv6_regen_rndid(struct inet6_dev *idev);
139 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
140
141 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
142 static int ipv6_count_addresses(const struct inet6_dev *idev);
143 static int ipv6_generate_stable_address(struct in6_addr *addr,
144 u8 dad_count,
145 const struct inet6_dev *idev);
146
147 #define IN6_ADDR_HSIZE_SHIFT 8
148 #define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
149 /*
150 * Configured unicast address hash table
151 */
152 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
153 static DEFINE_SPINLOCK(addrconf_hash_lock);
154
155 static void addrconf_verify(void);
156 static void addrconf_verify_rtnl(void);
157 static void addrconf_verify_work(struct work_struct *);
158
159 static struct workqueue_struct *addrconf_wq;
160 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
161
162 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
163 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
164
165 static void addrconf_type_change(struct net_device *dev,
166 unsigned long event);
167 static int addrconf_ifdown(struct net_device *dev, int how);
168
169 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
170 int plen,
171 const struct net_device *dev,
172 u32 flags, u32 noflags,
173 bool no_gw);
174
175 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
176 static void addrconf_dad_work(struct work_struct *w);
177 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
178 bool send_na);
179 static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
180 static void addrconf_rs_timer(struct timer_list *t);
181 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
183
184 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
185 struct prefix_info *pinfo);
186
187 static struct ipv6_devconf ipv6_devconf __read_mostly = {
188 .forwarding = 0,
189 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
190 .mtu6 = IPV6_MIN_MTU,
191 .accept_ra = 1,
192 .accept_redirects = 1,
193 .autoconf = 1,
194 .force_mld_version = 0,
195 .mldv1_unsolicited_report_interval = 10 * HZ,
196 .mldv2_unsolicited_report_interval = HZ,
197 .dad_transmits = 1,
198 .rtr_solicits = MAX_RTR_SOLICITATIONS,
199 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
200 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
201 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
202 .use_tempaddr = 0,
203 .temp_valid_lft = TEMP_VALID_LIFETIME,
204 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
205 .regen_max_retry = REGEN_MAX_RETRY,
206 .max_desync_factor = MAX_DESYNC_FACTOR,
207 .max_addresses = IPV6_MAX_ADDRESSES,
208 .accept_ra_defrtr = 1,
209 .accept_ra_from_local = 0,
210 .accept_ra_min_hop_limit= 1,
211 .accept_ra_pinfo = 1,
212 #ifdef CONFIG_IPV6_ROUTER_PREF
213 .accept_ra_rtr_pref = 1,
214 .rtr_probe_interval = 60 * HZ,
215 #ifdef CONFIG_IPV6_ROUTE_INFO
216 .accept_ra_rt_info_min_plen = 0,
217 .accept_ra_rt_info_max_plen = 0,
218 #endif
219 #endif
220 .proxy_ndp = 0,
221 .accept_source_route = 0, /* we do not accept RH0 by default. */
222 .disable_ipv6 = 0,
223 .accept_dad = 0,
224 .suppress_frag_ndisc = 1,
225 .accept_ra_mtu = 1,
226 .stable_secret = {
227 .initialized = false,
228 },
229 .use_oif_addrs_only = 0,
230 .ignore_routes_with_linkdown = 0,
231 .keep_addr_on_down = 0,
232 .seg6_enabled = 0,
233 #ifdef CONFIG_IPV6_SEG6_HMAC
234 .seg6_require_hmac = 0,
235 #endif
236 .enhanced_dad = 1,
237 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
238 .disable_policy = 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 };
294
295 /* Check if link is ready: is it up and is a valid qdisc available */
296 static inline bool addrconf_link_ready(const struct net_device *dev)
297 {
298 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
299 }
300
301 static void addrconf_del_rs_timer(struct inet6_dev *idev)
302 {
303 if (del_timer(&idev->rs_timer))
304 __in6_dev_put(idev);
305 }
306
307 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
308 {
309 if (cancel_delayed_work(&ifp->dad_work))
310 __in6_ifa_put(ifp);
311 }
312
313 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
314 unsigned long when)
315 {
316 if (!timer_pending(&idev->rs_timer))
317 in6_dev_hold(idev);
318 mod_timer(&idev->rs_timer, jiffies + when);
319 }
320
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
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
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 } else
434 ipv6_regen_rndid(ndev);
435
436 ndev->token = in6addr_any;
437
438 if (netif_running(dev) && addrconf_link_ready(dev))
439 ndev->if_flags |= IF_READY;
440
441 ipv6_mc_init_dev(ndev);
442 ndev->tstamp = jiffies;
443 err = addrconf_sysctl_register(ndev);
444 if (err) {
445 ipv6_mc_destroy_dev(ndev);
446 snmp6_unregister_dev(ndev);
447 goto err_release;
448 }
449 /* protected by rtnl_lock */
450 rcu_assign_pointer(dev->ip6_ptr, ndev);
451
452 /* Join interface-local all-node multicast group */
453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
454
455 /* Join all-node multicast group */
456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
457
458 /* Join all-router multicast group if forwarding is set */
459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
461
462 return ndev;
463
464 err_release:
465 neigh_parms_release(&nd_tbl, ndev->nd_parms);
466 ndev->dead = 1;
467 in6_dev_finish_destroy(ndev);
468 return ERR_PTR(err);
469 }
470
471 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
472 {
473 struct inet6_dev *idev;
474
475 ASSERT_RTNL();
476
477 idev = __in6_dev_get(dev);
478 if (!idev) {
479 idev = ipv6_add_dev(dev);
480 if (IS_ERR(idev))
481 return NULL;
482 }
483
484 if (dev->flags&IFF_UP)
485 ipv6_mc_up(idev);
486 return idev;
487 }
488
489 static int inet6_netconf_msgsize_devconf(int type)
490 {
491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
492 + nla_total_size(4); /* NETCONFA_IFINDEX */
493 bool all = false;
494
495 if (type == NETCONFA_ALL)
496 all = true;
497
498 if (all || type == NETCONFA_FORWARDING)
499 size += nla_total_size(4);
500 #ifdef CONFIG_IPV6_MROUTE
501 if (all || type == NETCONFA_MC_FORWARDING)
502 size += nla_total_size(4);
503 #endif
504 if (all || type == NETCONFA_PROXY_NEIGH)
505 size += nla_total_size(4);
506
507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
508 size += nla_total_size(4);
509
510 return size;
511 }
512
513 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
514 struct ipv6_devconf *devconf, u32 portid,
515 u32 seq, int event, unsigned int flags,
516 int type)
517 {
518 struct nlmsghdr *nlh;
519 struct netconfmsg *ncm;
520 bool all = false;
521
522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
523 flags);
524 if (!nlh)
525 return -EMSGSIZE;
526
527 if (type == NETCONFA_ALL)
528 all = true;
529
530 ncm = nlmsg_data(nlh);
531 ncm->ncm_family = AF_INET6;
532
533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
534 goto nla_put_failure;
535
536 if (!devconf)
537 goto out;
538
539 if ((all || type == NETCONFA_FORWARDING) &&
540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
541 goto nla_put_failure;
542 #ifdef CONFIG_IPV6_MROUTE
543 if ((all || type == NETCONFA_MC_FORWARDING) &&
544 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
545 devconf->mc_forwarding) < 0)
546 goto nla_put_failure;
547 #endif
548 if ((all || type == NETCONFA_PROXY_NEIGH) &&
549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
550 goto nla_put_failure;
551
552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
554 devconf->ignore_routes_with_linkdown) < 0)
555 goto nla_put_failure;
556
557 out:
558 nlmsg_end(skb, nlh);
559 return 0;
560
561 nla_put_failure:
562 nlmsg_cancel(skb, nlh);
563 return -EMSGSIZE;
564 }
565
566 void inet6_netconf_notify_devconf(struct net *net, int event, int type,
567 int ifindex, struct ipv6_devconf *devconf)
568 {
569 struct sk_buff *skb;
570 int err = -ENOBUFS;
571
572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
573 if (!skb)
574 goto errout;
575
576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
577 event, 0, type);
578 if (err < 0) {
579 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
580 WARN_ON(err == -EMSGSIZE);
581 kfree_skb(skb);
582 goto errout;
583 }
584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
585 return;
586 errout:
587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
588 }
589
590 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
591 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
592 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
595 };
596
597 static int inet6_netconf_valid_get_req(struct sk_buff *skb,
598 const struct nlmsghdr *nlh,
599 struct nlattr **tb,
600 struct netlink_ext_ack *extack)
601 {
602 int i, err;
603
604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
606 return -EINVAL;
607 }
608
609 if (!netlink_strict_get_check(skb))
610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
611 tb, NETCONFA_MAX,
612 devconf_ipv6_policy, extack);
613
614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
615 tb, NETCONFA_MAX,
616 devconf_ipv6_policy, extack);
617 if (err)
618 return err;
619
620 for (i = 0; i <= NETCONFA_MAX; i++) {
621 if (!tb[i])
622 continue;
623
624 switch (i) {
625 case NETCONFA_IFINDEX:
626 break;
627 default:
628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
629 return -EINVAL;
630 }
631 }
632
633 return 0;
634 }
635
636 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
637 struct nlmsghdr *nlh,
638 struct netlink_ext_ack *extack)
639 {
640 struct net *net = sock_net(in_skb->sk);
641 struct nlattr *tb[NETCONFA_MAX+1];
642 struct inet6_dev *in6_dev = NULL;
643 struct net_device *dev = NULL;
644 struct sk_buff *skb;
645 struct ipv6_devconf *devconf;
646 int ifindex;
647 int err;
648
649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
650 if (err < 0)
651 return err;
652
653 if (!tb[NETCONFA_IFINDEX])
654 return -EINVAL;
655
656 err = -EINVAL;
657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
658 switch (ifindex) {
659 case NETCONFA_IFINDEX_ALL:
660 devconf = net->ipv6.devconf_all;
661 break;
662 case NETCONFA_IFINDEX_DEFAULT:
663 devconf = net->ipv6.devconf_dflt;
664 break;
665 default:
666 dev = dev_get_by_index(net, ifindex);
667 if (!dev)
668 return -EINVAL;
669 in6_dev = in6_dev_get(dev);
670 if (!in6_dev)
671 goto errout;
672 devconf = &in6_dev->cnf;
673 break;
674 }
675
676 err = -ENOBUFS;
677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
678 if (!skb)
679 goto errout;
680
681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
682 NETLINK_CB(in_skb).portid,
683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
684 NETCONFA_ALL);
685 if (err < 0) {
686 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
687 WARN_ON(err == -EMSGSIZE);
688 kfree_skb(skb);
689 goto errout;
690 }
691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
692 errout:
693 if (in6_dev)
694 in6_dev_put(in6_dev);
695 if (dev)
696 dev_put(dev);
697 return err;
698 }
699
700 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
701 struct netlink_callback *cb)
702 {
703 const struct nlmsghdr *nlh = cb->nlh;
704 struct net *net = sock_net(skb->sk);
705 int h, s_h;
706 int idx, s_idx;
707 struct net_device *dev;
708 struct inet6_dev *idev;
709 struct hlist_head *head;
710
711 if (cb->strict_check) {
712 struct netlink_ext_ack *extack = cb->extack;
713 struct netconfmsg *ncm;
714
715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
717 return -EINVAL;
718 }
719
720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
722 return -EINVAL;
723 }
724 }
725
726 s_h = cb->args[0];
727 s_idx = idx = cb->args[1];
728
729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
730 idx = 0;
731 head = &net->dev_index_head[h];
732 rcu_read_lock();
733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
734 net->dev_base_seq;
735 hlist_for_each_entry_rcu(dev, head, index_hlist) {
736 if (idx < s_idx)
737 goto cont;
738 idev = __in6_dev_get(dev);
739 if (!idev)
740 goto cont;
741
742 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
743 &idev->cnf,
744 NETLINK_CB(cb->skb).portid,
745 nlh->nlmsg_seq,
746 RTM_NEWNETCONF,
747 NLM_F_MULTI,
748 NETCONFA_ALL) < 0) {
749 rcu_read_unlock();
750 goto done;
751 }
752 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
753 cont:
754 idx++;
755 }
756 rcu_read_unlock();
757 }
758 if (h == NETDEV_HASHENTRIES) {
759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
760 net->ipv6.devconf_all,
761 NETLINK_CB(cb->skb).portid,
762 nlh->nlmsg_seq,
763 RTM_NEWNETCONF, NLM_F_MULTI,
764 NETCONFA_ALL) < 0)
765 goto done;
766 else
767 h++;
768 }
769 if (h == NETDEV_HASHENTRIES + 1) {
770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
771 net->ipv6.devconf_dflt,
772 NETLINK_CB(cb->skb).portid,
773 nlh->nlmsg_seq,
774 RTM_NEWNETCONF, NLM_F_MULTI,
775 NETCONFA_ALL) < 0)
776 goto done;
777 else
778 h++;
779 }
780 done:
781 cb->args[0] = h;
782 cb->args[1] = idx;
783
784 return skb->len;
785 }
786
787 #ifdef CONFIG_SYSCTL
788 static void dev_forward_change(struct inet6_dev *idev)
789 {
790 struct net_device *dev;
791 struct inet6_ifaddr *ifa;
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 list_for_each_entry(ifa, &idev->addr_list, if_list) {
811 if (ifa->flags&IFA_F_TENTATIVE)
812 continue;
813 if (idev->cnf.forwarding)
814 addrconf_join_anycast(ifa);
815 else
816 addrconf_leave_anycast(ifa);
817 }
818 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
819 NETCONFA_FORWARDING,
820 dev->ifindex, &idev->cnf);
821 }
822
823
824 static void addrconf_forward_change(struct net *net, __s32 newf)
825 {
826 struct net_device *dev;
827 struct inet6_dev *idev;
828
829 for_each_netdev(net, dev) {
830 idev = __in6_dev_get(dev);
831 if (idev) {
832 int changed = (!idev->cnf.forwarding) ^ (!newf);
833 idev->cnf.forwarding = newf;
834 if (changed)
835 dev_forward_change(idev);
836 }
837 }
838 }
839
840 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
841 {
842 struct net *net;
843 int old;
844
845 if (!rtnl_trylock())
846 return restart_syscall();
847
848 net = (struct net *)table->extra2;
849 old = *p;
850 *p = newf;
851
852 if (p == &net->ipv6.devconf_dflt->forwarding) {
853 if ((!newf) ^ (!old))
854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
855 NETCONFA_FORWARDING,
856 NETCONFA_IFINDEX_DEFAULT,
857 net->ipv6.devconf_dflt);
858 rtnl_unlock();
859 return 0;
860 }
861
862 if (p == &net->ipv6.devconf_all->forwarding) {
863 int old_dflt = net->ipv6.devconf_dflt->forwarding;
864
865 net->ipv6.devconf_dflt->forwarding = newf;
866 if ((!newf) ^ (!old_dflt))
867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
868 NETCONFA_FORWARDING,
869 NETCONFA_IFINDEX_DEFAULT,
870 net->ipv6.devconf_dflt);
871
872 addrconf_forward_change(net, newf);
873 if ((!newf) ^ (!old))
874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
875 NETCONFA_FORWARDING,
876 NETCONFA_IFINDEX_ALL,
877 net->ipv6.devconf_all);
878 } else if ((!newf) ^ (!old))
879 dev_forward_change((struct inet6_dev *)table->extra1);
880 rtnl_unlock();
881
882 if (newf)
883 rt6_purge_dflt_routers(net);
884 return 1;
885 }
886
887 static void addrconf_linkdown_change(struct net *net, __s32 newf)
888 {
889 struct net_device *dev;
890 struct inet6_dev *idev;
891
892 for_each_netdev(net, dev) {
893 idev = __in6_dev_get(dev);
894 if (idev) {
895 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
896
897 idev->cnf.ignore_routes_with_linkdown = newf;
898 if (changed)
899 inet6_netconf_notify_devconf(dev_net(dev),
900 RTM_NEWNETCONF,
901 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
902 dev->ifindex,
903 &idev->cnf);
904 }
905 }
906 }
907
908 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
909 {
910 struct net *net;
911 int old;
912
913 if (!rtnl_trylock())
914 return restart_syscall();
915
916 net = (struct net *)table->extra2;
917 old = *p;
918 *p = newf;
919
920 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
921 if ((!newf) ^ (!old))
922 inet6_netconf_notify_devconf(net,
923 RTM_NEWNETCONF,
924 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
925 NETCONFA_IFINDEX_DEFAULT,
926 net->ipv6.devconf_dflt);
927 rtnl_unlock();
928 return 0;
929 }
930
931 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
932 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
933 addrconf_linkdown_change(net, newf);
934 if ((!newf) ^ (!old))
935 inet6_netconf_notify_devconf(net,
936 RTM_NEWNETCONF,
937 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
938 NETCONFA_IFINDEX_ALL,
939 net->ipv6.devconf_all);
940 }
941 rtnl_unlock();
942
943 return 1;
944 }
945
946 #endif
947
948 /* Nobody refers to this ifaddr, destroy it */
949 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
950 {
951 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
952
953 #ifdef NET_REFCNT_DEBUG
954 pr_debug("%s\n", __func__);
955 #endif
956
957 in6_dev_put(ifp->idev);
958
959 if (cancel_delayed_work(&ifp->dad_work))
960 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
961 ifp);
962
963 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
964 pr_warn("Freeing alive inet6 address %p\n", ifp);
965 return;
966 }
967
968 kfree_rcu(ifp, rcu);
969 }
970
971 static void
972 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
973 {
974 struct list_head *p;
975 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
976
977 /*
978 * Each device address list is sorted in order of scope -
979 * global before linklocal.
980 */
981 list_for_each(p, &idev->addr_list) {
982 struct inet6_ifaddr *ifa
983 = list_entry(p, struct inet6_ifaddr, if_list);
984 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
985 break;
986 }
987
988 list_add_tail_rcu(&ifp->if_list, p);
989 }
990
991 static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
992 {
993 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
994
995 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
996 }
997
998 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
999 struct net_device *dev, unsigned int hash)
1000 {
1001 struct inet6_ifaddr *ifp;
1002
1003 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1004 if (!net_eq(dev_net(ifp->idev->dev), net))
1005 continue;
1006 if (ipv6_addr_equal(&ifp->addr, addr)) {
1007 if (!dev || ifp->idev->dev == dev)
1008 return true;
1009 }
1010 }
1011 return false;
1012 }
1013
1014 static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1015 {
1016 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1017 int err = 0;
1018
1019 spin_lock(&addrconf_hash_lock);
1020
1021 /* Ignore adding duplicate addresses on an interface */
1022 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1023 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1024 err = -EEXIST;
1025 } else {
1026 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1027 }
1028
1029 spin_unlock(&addrconf_hash_lock);
1030
1031 return err;
1032 }
1033
1034 /* On success it returns ifp with increased reference count */
1035
1036 static struct inet6_ifaddr *
1037 ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1038 bool can_block, struct netlink_ext_ack *extack)
1039 {
1040 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1041 int addr_type = ipv6_addr_type(cfg->pfx);
1042 struct net *net = dev_net(idev->dev);
1043 struct inet6_ifaddr *ifa = NULL;
1044 struct fib6_info *f6i = NULL;
1045 int err = 0;
1046
1047 if (addr_type == IPV6_ADDR_ANY ||
1048 addr_type & IPV6_ADDR_MULTICAST ||
1049 (!(idev->dev->flags & IFF_LOOPBACK) &&
1050 !netif_is_l3_master(idev->dev) &&
1051 addr_type & IPV6_ADDR_LOOPBACK))
1052 return ERR_PTR(-EADDRNOTAVAIL);
1053
1054 if (idev->dead) {
1055 err = -ENODEV; /*XXX*/
1056 goto out;
1057 }
1058
1059 if (idev->cnf.disable_ipv6) {
1060 err = -EACCES;
1061 goto out;
1062 }
1063
1064 /* validator notifier needs to be blocking;
1065 * do not call in atomic context
1066 */
1067 if (can_block) {
1068 struct in6_validator_info i6vi = {
1069 .i6vi_addr = *cfg->pfx,
1070 .i6vi_dev = idev,
1071 .extack = extack,
1072 };
1073
1074 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1075 err = notifier_to_errno(err);
1076 if (err < 0)
1077 goto out;
1078 }
1079
1080 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1081 if (!ifa) {
1082 err = -ENOBUFS;
1083 goto out;
1084 }
1085
1086 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1087 if (IS_ERR(f6i)) {
1088 err = PTR_ERR(f6i);
1089 f6i = NULL;
1090 goto out;
1091 }
1092
1093 if (net->ipv6.devconf_all->disable_policy ||
1094 idev->cnf.disable_policy)
1095 f6i->dst_nopolicy = true;
1096
1097 neigh_parms_data_state_setall(idev->nd_parms);
1098
1099 ifa->addr = *cfg->pfx;
1100 if (cfg->peer_pfx)
1101 ifa->peer_addr = *cfg->peer_pfx;
1102
1103 spin_lock_init(&ifa->lock);
1104 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1105 INIT_HLIST_NODE(&ifa->addr_lst);
1106 ifa->scope = cfg->scope;
1107 ifa->prefix_len = cfg->plen;
1108 ifa->rt_priority = cfg->rt_priority;
1109 ifa->flags = cfg->ifa_flags;
1110 /* No need to add the TENTATIVE flag for addresses with NODAD */
1111 if (!(cfg->ifa_flags & IFA_F_NODAD))
1112 ifa->flags |= IFA_F_TENTATIVE;
1113 ifa->valid_lft = cfg->valid_lft;
1114 ifa->prefered_lft = cfg->preferred_lft;
1115 ifa->cstamp = ifa->tstamp = jiffies;
1116 ifa->tokenized = false;
1117
1118 ifa->rt = f6i;
1119
1120 ifa->idev = idev;
1121 in6_dev_hold(idev);
1122
1123 /* For caller */
1124 refcount_set(&ifa->refcnt, 1);
1125
1126 rcu_read_lock_bh();
1127
1128 err = ipv6_add_addr_hash(idev->dev, ifa);
1129 if (err < 0) {
1130 rcu_read_unlock_bh();
1131 goto out;
1132 }
1133
1134 write_lock(&idev->lock);
1135
1136 /* Add to inet6_dev unicast addr list. */
1137 ipv6_link_dev_addr(idev, ifa);
1138
1139 if (ifa->flags&IFA_F_TEMPORARY) {
1140 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1141 in6_ifa_hold(ifa);
1142 }
1143
1144 in6_ifa_hold(ifa);
1145 write_unlock(&idev->lock);
1146
1147 rcu_read_unlock_bh();
1148
1149 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1150 out:
1151 if (unlikely(err < 0)) {
1152 fib6_info_release(f6i);
1153
1154 if (ifa) {
1155 if (ifa->idev)
1156 in6_dev_put(ifa->idev);
1157 kfree(ifa);
1158 }
1159 ifa = ERR_PTR(err);
1160 }
1161
1162 return ifa;
1163 }
1164
1165 enum cleanup_prefix_rt_t {
1166 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1167 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1168 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1169 };
1170
1171 /*
1172 * Check, whether the prefix for ifp would still need a prefix route
1173 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1174 * constants.
1175 *
1176 * 1) we don't purge prefix if address was not permanent.
1177 * prefix is managed by its own lifetime.
1178 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1179 * 3) if there are no addresses, delete prefix.
1180 * 4) if there are still other permanent address(es),
1181 * corresponding prefix is still permanent.
1182 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1183 * don't purge the prefix, assume user space is managing it.
1184 * 6) otherwise, update prefix lifetime to the
1185 * longest valid lifetime among the corresponding
1186 * addresses on the device.
1187 * Note: subsequent RA will update lifetime.
1188 **/
1189 static enum cleanup_prefix_rt_t
1190 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1191 {
1192 struct inet6_ifaddr *ifa;
1193 struct inet6_dev *idev = ifp->idev;
1194 unsigned long lifetime;
1195 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1196
1197 *expires = jiffies;
1198
1199 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1200 if (ifa == ifp)
1201 continue;
1202 if (ifa->prefix_len != ifp->prefix_len ||
1203 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1204 ifp->prefix_len))
1205 continue;
1206 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1207 return CLEANUP_PREFIX_RT_NOP;
1208
1209 action = CLEANUP_PREFIX_RT_EXPIRE;
1210
1211 spin_lock(&ifa->lock);
1212
1213 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1214 /*
1215 * Note: Because this address is
1216 * not permanent, lifetime <
1217 * LONG_MAX / HZ here.
1218 */
1219 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1220 *expires = ifa->tstamp + lifetime * HZ;
1221 spin_unlock(&ifa->lock);
1222 }
1223
1224 return action;
1225 }
1226
1227 static void
1228 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1229 {
1230 struct fib6_info *f6i;
1231
1232 f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len,
1233 ifp->idev->dev, 0, RTF_DEFAULT, true);
1234 if (f6i) {
1235 if (del_rt)
1236 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
1237 else {
1238 if (!(f6i->fib6_flags & RTF_EXPIRES))
1239 fib6_set_expires(f6i, expires);
1240 fib6_info_release(f6i);
1241 }
1242 }
1243 }
1244
1245
1246 /* This function wants to get referenced ifp and releases it before return */
1247
1248 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1249 {
1250 int state;
1251 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1252 unsigned long expires;
1253
1254 ASSERT_RTNL();
1255
1256 spin_lock_bh(&ifp->lock);
1257 state = ifp->state;
1258 ifp->state = INET6_IFADDR_STATE_DEAD;
1259 spin_unlock_bh(&ifp->lock);
1260
1261 if (state == INET6_IFADDR_STATE_DEAD)
1262 goto out;
1263
1264 spin_lock_bh(&addrconf_hash_lock);
1265 hlist_del_init_rcu(&ifp->addr_lst);
1266 spin_unlock_bh(&addrconf_hash_lock);
1267
1268 write_lock_bh(&ifp->idev->lock);
1269
1270 if (ifp->flags&IFA_F_TEMPORARY) {
1271 list_del(&ifp->tmp_list);
1272 if (ifp->ifpub) {
1273 in6_ifa_put(ifp->ifpub);
1274 ifp->ifpub = NULL;
1275 }
1276 __in6_ifa_put(ifp);
1277 }
1278
1279 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1280 action = check_cleanup_prefix_route(ifp, &expires);
1281
1282 list_del_rcu(&ifp->if_list);
1283 __in6_ifa_put(ifp);
1284
1285 write_unlock_bh(&ifp->idev->lock);
1286
1287 addrconf_del_dad_work(ifp);
1288
1289 ipv6_ifa_notify(RTM_DELADDR, ifp);
1290
1291 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1292
1293 if (action != CLEANUP_PREFIX_RT_NOP) {
1294 cleanup_prefix_route(ifp, expires,
1295 action == CLEANUP_PREFIX_RT_DEL);
1296 }
1297
1298 /* clean up prefsrc entries */
1299 rt6_remove_prefsrc(ifp);
1300 out:
1301 in6_ifa_put(ifp);
1302 }
1303
1304 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp,
1305 struct inet6_ifaddr *ift,
1306 bool block)
1307 {
1308 struct inet6_dev *idev = ifp->idev;
1309 struct in6_addr addr, *tmpaddr;
1310 unsigned long tmp_tstamp, age;
1311 unsigned long regen_advance;
1312 struct ifa6_config cfg;
1313 int ret = 0;
1314 unsigned long now = jiffies;
1315 long max_desync_factor;
1316 s32 cnf_temp_preferred_lft;
1317
1318 write_lock_bh(&idev->lock);
1319 if (ift) {
1320 spin_lock_bh(&ift->lock);
1321 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1322 spin_unlock_bh(&ift->lock);
1323 tmpaddr = &addr;
1324 } else {
1325 tmpaddr = NULL;
1326 }
1327 retry:
1328 in6_dev_hold(idev);
1329 if (idev->cnf.use_tempaddr <= 0) {
1330 write_unlock_bh(&idev->lock);
1331 pr_info("%s: use_tempaddr is disabled\n", __func__);
1332 in6_dev_put(idev);
1333 ret = -1;
1334 goto out;
1335 }
1336 spin_lock_bh(&ifp->lock);
1337 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1338 idev->cnf.use_tempaddr = -1; /*XXX*/
1339 spin_unlock_bh(&ifp->lock);
1340 write_unlock_bh(&idev->lock);
1341 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1342 __func__);
1343 in6_dev_put(idev);
1344 ret = -1;
1345 goto out;
1346 }
1347 in6_ifa_hold(ifp);
1348 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1349 ipv6_try_regen_rndid(idev, tmpaddr);
1350 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1351 age = (now - ifp->tstamp) / HZ;
1352
1353 regen_advance = idev->cnf.regen_max_retry *
1354 idev->cnf.dad_transmits *
1355 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1356
1357 /* recalculate max_desync_factor each time and update
1358 * idev->desync_factor if it's larger
1359 */
1360 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1361 max_desync_factor = min_t(__u32,
1362 idev->cnf.max_desync_factor,
1363 cnf_temp_preferred_lft - regen_advance);
1364
1365 if (unlikely(idev->desync_factor > max_desync_factor)) {
1366 if (max_desync_factor > 0) {
1367 get_random_bytes(&idev->desync_factor,
1368 sizeof(idev->desync_factor));
1369 idev->desync_factor %= max_desync_factor;
1370 } else {
1371 idev->desync_factor = 0;
1372 }
1373 }
1374
1375 memset(&cfg, 0, sizeof(cfg));
1376 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1377 idev->cnf.temp_valid_lft + age);
1378 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1379 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1380
1381 cfg.plen = ifp->prefix_len;
1382 tmp_tstamp = ifp->tstamp;
1383 spin_unlock_bh(&ifp->lock);
1384
1385 write_unlock_bh(&idev->lock);
1386
1387 /* A temporary address is created only if this calculated Preferred
1388 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1389 * an implementation must not create a temporary address with a zero
1390 * Preferred Lifetime.
1391 * Use age calculation as in addrconf_verify to avoid unnecessary
1392 * temporary addresses being generated.
1393 */
1394 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1395 if (cfg.preferred_lft <= regen_advance + age) {
1396 in6_ifa_put(ifp);
1397 in6_dev_put(idev);
1398 ret = -1;
1399 goto out;
1400 }
1401
1402 cfg.ifa_flags = IFA_F_TEMPORARY;
1403 /* set in addrconf_prefix_rcv() */
1404 if (ifp->flags & IFA_F_OPTIMISTIC)
1405 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1406
1407 cfg.pfx = &addr;
1408 cfg.scope = ipv6_addr_scope(cfg.pfx);
1409
1410 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1411 if (IS_ERR(ift)) {
1412 in6_ifa_put(ifp);
1413 in6_dev_put(idev);
1414 pr_info("%s: retry temporary address regeneration\n", __func__);
1415 tmpaddr = &addr;
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
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
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
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
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
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
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
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
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
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
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
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 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1903 const struct net_device *dev, bool skip_dev_check,
1904 int strict, u32 banned_flags)
1905 {
1906 unsigned int hash = inet6_addr_hash(net, addr);
1907 const struct net_device *l3mdev;
1908 struct inet6_ifaddr *ifp;
1909 u32 ifp_flags;
1910
1911 rcu_read_lock();
1912
1913 l3mdev = l3mdev_master_dev_rcu(dev);
1914 if (skip_dev_check)
1915 dev = NULL;
1916
1917 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1918 if (!net_eq(dev_net(ifp->idev->dev), net))
1919 continue;
1920
1921 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1922 continue;
1923
1924 /* Decouple optimistic from tentative for evaluation here.
1925 * Ban optimistic addresses explicitly, when required.
1926 */
1927 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1928 ? (ifp->flags&~IFA_F_TENTATIVE)
1929 : ifp->flags;
1930 if (ipv6_addr_equal(&ifp->addr, addr) &&
1931 !(ifp_flags&banned_flags) &&
1932 (!dev || ifp->idev->dev == dev ||
1933 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1934 rcu_read_unlock();
1935 return 1;
1936 }
1937 }
1938
1939 rcu_read_unlock();
1940 return 0;
1941 }
1942 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1943
1944
1945 /* Compares an address/prefix_len with addresses on device @dev.
1946 * If one is found it returns true.
1947 */
1948 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1949 const unsigned int prefix_len, struct net_device *dev)
1950 {
1951 const struct inet6_ifaddr *ifa;
1952 const struct inet6_dev *idev;
1953 bool ret = false;
1954
1955 rcu_read_lock();
1956 idev = __in6_dev_get(dev);
1957 if (idev) {
1958 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1959 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1960 if (ret)
1961 break;
1962 }
1963 }
1964 rcu_read_unlock();
1965
1966 return ret;
1967 }
1968 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1969
1970 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1971 {
1972 const struct inet6_ifaddr *ifa;
1973 const struct inet6_dev *idev;
1974 int onlink;
1975
1976 onlink = 0;
1977 rcu_read_lock();
1978 idev = __in6_dev_get(dev);
1979 if (idev) {
1980 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1981 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1982 ifa->prefix_len);
1983 if (onlink)
1984 break;
1985 }
1986 }
1987 rcu_read_unlock();
1988 return onlink;
1989 }
1990 EXPORT_SYMBOL(ipv6_chk_prefix);
1991
1992 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1993 struct net_device *dev, int strict)
1994 {
1995 unsigned int hash = inet6_addr_hash(net, addr);
1996 struct inet6_ifaddr *ifp, *result = NULL;
1997
1998 rcu_read_lock();
1999 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
2000 if (!net_eq(dev_net(ifp->idev->dev), net))
2001 continue;
2002 if (ipv6_addr_equal(&ifp->addr, addr)) {
2003 if (!dev || ifp->idev->dev == dev ||
2004 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
2005 result = ifp;
2006 in6_ifa_hold(ifp);
2007 break;
2008 }
2009 }
2010 }
2011 rcu_read_unlock();
2012
2013 return result;
2014 }
2015
2016 /* Gets referenced address, destroys ifaddr */
2017
2018 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2019 {
2020 if (dad_failed)
2021 ifp->flags |= IFA_F_DADFAILED;
2022
2023 if (ifp->flags&IFA_F_TEMPORARY) {
2024 struct inet6_ifaddr *ifpub;
2025 spin_lock_bh(&ifp->lock);
2026 ifpub = ifp->ifpub;
2027 if (ifpub) {
2028 in6_ifa_hold(ifpub);
2029 spin_unlock_bh(&ifp->lock);
2030 ipv6_create_tempaddr(ifpub, ifp, true);
2031 in6_ifa_put(ifpub);
2032 } else {
2033 spin_unlock_bh(&ifp->lock);
2034 }
2035 ipv6_del_addr(ifp);
2036 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2037 spin_lock_bh(&ifp->lock);
2038 addrconf_del_dad_work(ifp);
2039 ifp->flags |= IFA_F_TENTATIVE;
2040 if (dad_failed)
2041 ifp->flags &= ~IFA_F_OPTIMISTIC;
2042 spin_unlock_bh(&ifp->lock);
2043 if (dad_failed)
2044 ipv6_ifa_notify(0, ifp);
2045 in6_ifa_put(ifp);
2046 } else {
2047 ipv6_del_addr(ifp);
2048 }
2049 }
2050
2051 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2052 {
2053 int err = -ENOENT;
2054
2055 spin_lock_bh(&ifp->lock);
2056 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2057 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2058 err = 0;
2059 }
2060 spin_unlock_bh(&ifp->lock);
2061
2062 return err;
2063 }
2064
2065 void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2066 {
2067 struct inet6_dev *idev = ifp->idev;
2068 struct net *net = dev_net(ifp->idev->dev);
2069
2070 if (addrconf_dad_end(ifp)) {
2071 in6_ifa_put(ifp);
2072 return;
2073 }
2074
2075 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2076 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2077
2078 spin_lock_bh(&ifp->lock);
2079
2080 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2081 struct in6_addr new_addr;
2082 struct inet6_ifaddr *ifp2;
2083 int retries = ifp->stable_privacy_retry + 1;
2084 struct ifa6_config cfg = {
2085 .pfx = &new_addr,
2086 .plen = ifp->prefix_len,
2087 .ifa_flags = ifp->flags,
2088 .valid_lft = ifp->valid_lft,
2089 .preferred_lft = ifp->prefered_lft,
2090 .scope = ifp->scope,
2091 };
2092
2093 if (retries > net->ipv6.sysctl.idgen_retries) {
2094 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2095 ifp->idev->dev->name);
2096 goto errdad;
2097 }
2098
2099 new_addr = ifp->addr;
2100 if (ipv6_generate_stable_address(&new_addr, retries,
2101 idev))
2102 goto errdad;
2103
2104 spin_unlock_bh(&ifp->lock);
2105
2106 if (idev->cnf.max_addresses &&
2107 ipv6_count_addresses(idev) >=
2108 idev->cnf.max_addresses)
2109 goto lock_errdad;
2110
2111 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2112 ifp->idev->dev->name);
2113
2114 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2115 if (IS_ERR(ifp2))
2116 goto lock_errdad;
2117
2118 spin_lock_bh(&ifp2->lock);
2119 ifp2->stable_privacy_retry = retries;
2120 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2121 spin_unlock_bh(&ifp2->lock);
2122
2123 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2124 in6_ifa_put(ifp2);
2125 lock_errdad:
2126 spin_lock_bh(&ifp->lock);
2127 }
2128
2129 errdad:
2130 /* transition from _POSTDAD to _ERRDAD */
2131 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2132 spin_unlock_bh(&ifp->lock);
2133
2134 addrconf_mod_dad_work(ifp, 0);
2135 in6_ifa_put(ifp);
2136 }
2137
2138 /* Join to solicited addr multicast group.
2139 * caller must hold RTNL */
2140 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2141 {
2142 struct in6_addr maddr;
2143
2144 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2145 return;
2146
2147 addrconf_addr_solict_mult(addr, &maddr);
2148 ipv6_dev_mc_inc(dev, &maddr);
2149 }
2150
2151 /* caller must hold RTNL */
2152 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2153 {
2154 struct in6_addr maddr;
2155
2156 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2157 return;
2158
2159 addrconf_addr_solict_mult(addr, &maddr);
2160 __ipv6_dev_mc_dec(idev, &maddr);
2161 }
2162
2163 /* caller must hold RTNL */
2164 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2165 {
2166 struct in6_addr addr;
2167
2168 if (ifp->prefix_len >= 127) /* RFC 6164 */
2169 return;
2170 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2171 if (ipv6_addr_any(&addr))
2172 return;
2173 __ipv6_dev_ac_inc(ifp->idev, &addr);
2174 }
2175
2176 /* caller must hold RTNL */
2177 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2178 {
2179 struct in6_addr addr;
2180
2181 if (ifp->prefix_len >= 127) /* RFC 6164 */
2182 return;
2183 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2184 if (ipv6_addr_any(&addr))
2185 return;
2186 __ipv6_dev_ac_dec(ifp->idev, &addr);
2187 }
2188
2189 static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2190 {
2191 switch (dev->addr_len) {
2192 case ETH_ALEN:
2193 memcpy(eui, dev->dev_addr, 3);
2194 eui[3] = 0xFF;
2195 eui[4] = 0xFE;
2196 memcpy(eui + 5, dev->dev_addr + 3, 3);
2197 break;
2198 case EUI64_ADDR_LEN:
2199 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2200 eui[0] ^= 2;
2201 break;
2202 default:
2203 return -1;
2204 }
2205
2206 return 0;
2207 }
2208
2209 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2210 {
2211 union fwnet_hwaddr *ha;
2212
2213 if (dev->addr_len != FWNET_ALEN)
2214 return -1;
2215
2216 ha = (union fwnet_hwaddr *)dev->dev_addr;
2217
2218 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2219 eui[0] ^= 2;
2220 return 0;
2221 }
2222
2223 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2224 {
2225 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
2226 if (dev->addr_len != ARCNET_ALEN)
2227 return -1;
2228 memset(eui, 0, 7);
2229 eui[7] = *(u8 *)dev->dev_addr;
2230 return 0;
2231 }
2232
2233 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2234 {
2235 if (dev->addr_len != INFINIBAND_ALEN)
2236 return -1;
2237 memcpy(eui, dev->dev_addr + 12, 8);
2238 eui[0] |= 2;
2239 return 0;
2240 }
2241
2242 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2243 {
2244 if (addr == 0)
2245 return -1;
2246 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2247 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2248 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2249 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2250 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2251 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2252 eui[1] = 0;
2253 eui[2] = 0x5E;
2254 eui[3] = 0xFE;
2255 memcpy(eui + 4, &addr, 4);
2256 return 0;
2257 }
2258
2259 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2260 {
2261 if (dev->priv_flags & IFF_ISATAP)
2262 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2263 return -1;
2264 }
2265
2266 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2267 {
2268 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2269 }
2270
2271 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2272 {
2273 memcpy(eui, dev->perm_addr, 3);
2274 memcpy(eui + 5, dev->perm_addr + 3, 3);
2275 eui[3] = 0xFF;
2276 eui[4] = 0xFE;
2277 eui[0] ^= 2;
2278 return 0;
2279 }
2280
2281 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2282 {
2283 switch (dev->type) {
2284 case ARPHRD_ETHER:
2285 case ARPHRD_FDDI:
2286 return addrconf_ifid_eui48(eui, dev);
2287 case ARPHRD_ARCNET:
2288 return addrconf_ifid_arcnet(eui, dev);
2289 case ARPHRD_INFINIBAND:
2290 return addrconf_ifid_infiniband(eui, dev);
2291 case ARPHRD_SIT:
2292 return addrconf_ifid_sit(eui, dev);
2293 case ARPHRD_IPGRE:
2294 case ARPHRD_TUNNEL:
2295 return addrconf_ifid_gre(eui, dev);
2296 case ARPHRD_6LOWPAN:
2297 return addrconf_ifid_6lowpan(eui, dev);
2298 case ARPHRD_IEEE1394:
2299 return addrconf_ifid_ieee1394(eui, dev);
2300 case ARPHRD_TUNNEL6:
2301 case ARPHRD_IP6GRE:
2302 case ARPHRD_RAWIP:
2303 return addrconf_ifid_ip6tnl(eui, dev);
2304 }
2305 return -1;
2306 }
2307
2308 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2309 {
2310 int err = -1;
2311 struct inet6_ifaddr *ifp;
2312
2313 read_lock_bh(&idev->lock);
2314 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2315 if (ifp->scope > IFA_LINK)
2316 break;
2317 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2318 memcpy(eui, ifp->addr.s6_addr+8, 8);
2319 err = 0;
2320 break;
2321 }
2322 }
2323 read_unlock_bh(&idev->lock);
2324 return err;
2325 }
2326
2327 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2328 static void ipv6_regen_rndid(struct inet6_dev *idev)
2329 {
2330 regen:
2331 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2332 idev->rndid[0] &= ~0x02;
2333
2334 /*
2335 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2336 * check if generated address is not inappropriate
2337 *
2338 * - Reserved subnet anycast (RFC 2526)
2339 * 11111101 11....11 1xxxxxxx
2340 * - ISATAP (RFC4214) 6.1
2341 * 00-00-5E-FE-xx-xx-xx-xx
2342 * - value 0
2343 * - XXX: already assigned to an address on the device
2344 */
2345 if (idev->rndid[0] == 0xfd &&
2346 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2347 (idev->rndid[7]&0x80))
2348 goto regen;
2349 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2350 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2351 goto regen;
2352 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2353 goto regen;
2354 }
2355 }
2356
2357 static void ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2358 {
2359 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2360 ipv6_regen_rndid(idev);
2361 }
2362
2363 /*
2364 * Add prefix route.
2365 */
2366
2367 static void
2368 addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2369 struct net_device *dev, unsigned long expires,
2370 u32 flags, gfp_t gfp_flags)
2371 {
2372 struct fib6_config cfg = {
2373 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2374 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2375 .fc_ifindex = dev->ifindex,
2376 .fc_expires = expires,
2377 .fc_dst_len = plen,
2378 .fc_flags = RTF_UP | flags,
2379 .fc_nlinfo.nl_net = dev_net(dev),
2380 .fc_protocol = RTPROT_KERNEL,
2381 .fc_type = RTN_UNICAST,
2382 };
2383
2384 cfg.fc_dst = *pfx;
2385
2386 /* Prevent useless cloning on PtP SIT.
2387 This thing is done here expecting that the whole
2388 class of non-broadcast devices need not cloning.
2389 */
2390 #if IS_ENABLED(CONFIG_IPV6_SIT)
2391 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2392 cfg.fc_flags |= RTF_NONEXTHOP;
2393 #endif
2394
2395 ip6_route_add(&cfg, gfp_flags, NULL);
2396 }
2397
2398
2399 static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2400 int plen,
2401 const struct net_device *dev,
2402 u32 flags, u32 noflags,
2403 bool no_gw)
2404 {
2405 struct fib6_node *fn;
2406 struct fib6_info *rt = NULL;
2407 struct fib6_table *table;
2408 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2409
2410 table = fib6_get_table(dev_net(dev), tb_id);
2411 if (!table)
2412 return NULL;
2413
2414 rcu_read_lock();
2415 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2416 if (!fn)
2417 goto out;
2418
2419 for_each_fib6_node_rt_rcu(fn) {
2420 if (rt->fib6_nh.fib_nh_dev->ifindex != dev->ifindex)
2421 continue;
2422 if (no_gw && rt->fib6_nh.fib_nh_gw_family)
2423 continue;
2424 if ((rt->fib6_flags & flags) != flags)
2425 continue;
2426 if ((rt->fib6_flags & noflags) != 0)
2427 continue;
2428 if (!fib6_info_hold_safe(rt))
2429 continue;
2430 break;
2431 }
2432 out:
2433 rcu_read_unlock();
2434 return rt;
2435 }
2436
2437
2438 /* Create "default" multicast route to the interface */
2439
2440 static void addrconf_add_mroute(struct net_device *dev)
2441 {
2442 struct fib6_config cfg = {
2443 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2444 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2445 .fc_ifindex = dev->ifindex,
2446 .fc_dst_len = 8,
2447 .fc_flags = RTF_UP,
2448 .fc_type = RTN_UNICAST,
2449 .fc_nlinfo.nl_net = dev_net(dev),
2450 };
2451
2452 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2453
2454 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2455 }
2456
2457 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2458 {
2459 struct inet6_dev *idev;
2460
2461 ASSERT_RTNL();
2462
2463 idev = ipv6_find_idev(dev);
2464 if (!idev)
2465 return ERR_PTR(-ENOBUFS);
2466
2467 if (idev->cnf.disable_ipv6)
2468 return ERR_PTR(-EACCES);
2469
2470 /* Add default multicast route */
2471 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2472 addrconf_add_mroute(dev);
2473
2474 return idev;
2475 }
2476
2477 static void manage_tempaddrs(struct inet6_dev *idev,
2478 struct inet6_ifaddr *ifp,
2479 __u32 valid_lft, __u32 prefered_lft,
2480 bool create, unsigned long now)
2481 {
2482 u32 flags;
2483 struct inet6_ifaddr *ift;
2484
2485 read_lock_bh(&idev->lock);
2486 /* update all temporary addresses in the list */
2487 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2488 int age, max_valid, max_prefered;
2489
2490 if (ifp != ift->ifpub)
2491 continue;
2492
2493 /* RFC 4941 section 3.3:
2494 * If a received option will extend the lifetime of a public
2495 * address, the lifetimes of temporary addresses should
2496 * be extended, subject to the overall constraint that no
2497 * temporary addresses should ever remain "valid" or "preferred"
2498 * for a time longer than (TEMP_VALID_LIFETIME) or
2499 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2500 */
2501 age = (now - ift->cstamp) / HZ;
2502 max_valid = idev->cnf.temp_valid_lft - age;
2503 if (max_valid < 0)
2504 max_valid = 0;
2505
2506 max_prefered = idev->cnf.temp_prefered_lft -
2507 idev->desync_factor - age;
2508 if (max_prefered < 0)
2509 max_prefered = 0;
2510
2511 if (valid_lft > max_valid)
2512 valid_lft = max_valid;
2513
2514 if (prefered_lft > max_prefered)
2515 prefered_lft = max_prefered;
2516
2517 spin_lock(&ift->lock);
2518 flags = ift->flags;
2519 ift->valid_lft = valid_lft;
2520 ift->prefered_lft = prefered_lft;
2521 ift->tstamp = now;
2522 if (prefered_lft > 0)
2523 ift->flags &= ~IFA_F_DEPRECATED;
2524
2525 spin_unlock(&ift->lock);
2526 if (!(flags&IFA_F_TENTATIVE))
2527 ipv6_ifa_notify(0, ift);
2528 }
2529
2530 if ((create || list_empty(&idev->tempaddr_list)) &&
2531 idev->cnf.use_tempaddr > 0) {
2532 /* When a new public address is created as described
2533 * in [ADDRCONF], also create a new temporary address.
2534 * Also create a temporary address if it's enabled but
2535 * no temporary address currently exists.
2536 */
2537 read_unlock_bh(&idev->lock);
2538 ipv6_create_tempaddr(ifp, NULL, false);
2539 } else {
2540 read_unlock_bh(&idev->lock);
2541 }
2542 }
2543
2544 static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2545 {
2546 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2547 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2548 }
2549
2550 int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2551 const struct prefix_info *pinfo,
2552 struct inet6_dev *in6_dev,
2553 const struct in6_addr *addr, int addr_type,
2554 u32 addr_flags, bool sllao, bool tokenized,
2555 __u32 valid_lft, u32 prefered_lft)
2556 {
2557 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2558 int create = 0, update_lft = 0;
2559
2560 if (!ifp && valid_lft) {
2561 int max_addresses = in6_dev->cnf.max_addresses;
2562 struct ifa6_config cfg = {
2563 .pfx = addr,
2564 .plen = pinfo->prefix_len,
2565 .ifa_flags = addr_flags,
2566 .valid_lft = valid_lft,
2567 .preferred_lft = prefered_lft,
2568 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2569 };
2570
2571 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2572 if ((net->ipv6.devconf_all->optimistic_dad ||
2573 in6_dev->cnf.optimistic_dad) &&
2574 !net->ipv6.devconf_all->forwarding && sllao)
2575 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2576 #endif
2577
2578 /* Do not allow to create too much of autoconfigured
2579 * addresses; this would be too easy way to crash kernel.
2580 */
2581 if (!max_addresses ||
2582 ipv6_count_addresses(in6_dev) < max_addresses)
2583 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2584
2585 if (IS_ERR_OR_NULL(ifp))
2586 return -1;
2587
2588 create = 1;
2589 spin_lock_bh(&ifp->lock);
2590 ifp->flags |= IFA_F_MANAGETEMPADDR;
2591 ifp->cstamp = jiffies;
2592 ifp->tokenized = tokenized;
2593 spin_unlock_bh(&ifp->lock);
2594 addrconf_dad_start(ifp);
2595 }
2596
2597 if (ifp) {
2598 u32 flags;
2599 unsigned long now;
2600 u32 stored_lft;
2601
2602 /* update lifetime (RFC2462 5.5.3 e) */
2603 spin_lock_bh(&ifp->lock);
2604 now = jiffies;
2605 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2606 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2607 else
2608 stored_lft = 0;
2609 if (!create && stored_lft) {
2610 const u32 minimum_lft = min_t(u32,
2611 stored_lft, MIN_VALID_LIFETIME);
2612 valid_lft = max(valid_lft, minimum_lft);
2613
2614 /* RFC4862 Section 5.5.3e:
2615 * "Note that the preferred lifetime of the
2616 * corresponding address is always reset to
2617 * the Preferred Lifetime in the received
2618 * Prefix Information option, regardless of
2619 * whether the valid lifetime is also reset or
2620 * ignored."
2621 *
2622 * So we should always update prefered_lft here.
2623 */
2624 update_lft = 1;
2625 }
2626
2627 if (update_lft) {
2628 ifp->valid_lft = valid_lft;
2629 ifp->prefered_lft = prefered_lft;
2630 ifp->tstamp = now;
2631 flags = ifp->flags;
2632 ifp->flags &= ~IFA_F_DEPRECATED;
2633 spin_unlock_bh(&ifp->lock);
2634
2635 if (!(flags&IFA_F_TENTATIVE))
2636 ipv6_ifa_notify(0, ifp);
2637 } else
2638 spin_unlock_bh(&ifp->lock);
2639
2640 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2641 create, now);
2642
2643 in6_ifa_put(ifp);
2644 addrconf_verify();
2645 }
2646
2647 return 0;
2648 }
2649 EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2650
2651 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2652 {
2653 struct prefix_info *pinfo;
2654 __u32 valid_lft;
2655 __u32 prefered_lft;
2656 int addr_type, err;
2657 u32 addr_flags = 0;
2658 struct inet6_dev *in6_dev;
2659 struct net *net = dev_net(dev);
2660
2661 pinfo = (struct prefix_info *) opt;
2662
2663 if (len < sizeof(struct prefix_info)) {
2664 netdev_dbg(dev, "addrconf: prefix option too short\n");
2665 return;
2666 }
2667
2668 /*
2669 * Validation checks ([ADDRCONF], page 19)
2670 */
2671
2672 addr_type = ipv6_addr_type(&pinfo->prefix);
2673
2674 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2675 return;
2676
2677 valid_lft = ntohl(pinfo->valid);
2678 prefered_lft = ntohl(pinfo->prefered);
2679
2680 if (prefered_lft > valid_lft) {
2681 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2682 return;
2683 }
2684
2685 in6_dev = in6_dev_get(dev);
2686
2687 if (!in6_dev) {
2688 net_dbg_ratelimited("addrconf: device %s not configured\n",
2689 dev->name);
2690 return;
2691 }
2692
2693 /*
2694 * Two things going on here:
2695 * 1) Add routes for on-link prefixes
2696 * 2) Configure prefixes with the auto flag set
2697 */
2698
2699 if (pinfo->onlink) {
2700 struct fib6_info *rt;
2701 unsigned long rt_expires;
2702
2703 /* Avoid arithmetic overflow. Really, we could
2704 * save rt_expires in seconds, likely valid_lft,
2705 * but it would require division in fib gc, that it
2706 * not good.
2707 */
2708 if (HZ > USER_HZ)
2709 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2710 else
2711 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2712
2713 if (addrconf_finite_timeout(rt_expires))
2714 rt_expires *= HZ;
2715
2716 rt = addrconf_get_prefix_route(&pinfo->prefix,
2717 pinfo->prefix_len,
2718 dev,
2719 RTF_ADDRCONF | RTF_PREFIX_RT,
2720 RTF_DEFAULT, true);
2721
2722 if (rt) {
2723 /* Autoconf prefix route */
2724 if (valid_lft == 0) {
2725 ip6_del_rt(net, rt);
2726 rt = NULL;
2727 } else if (addrconf_finite_timeout(rt_expires)) {
2728 /* not infinity */
2729 fib6_set_expires(rt, jiffies + rt_expires);
2730 } else {
2731 fib6_clean_expires(rt);
2732 }
2733 } else if (valid_lft) {
2734 clock_t expires = 0;
2735 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2736 if (addrconf_finite_timeout(rt_expires)) {
2737 /* not infinity */
2738 flags |= RTF_EXPIRES;
2739 expires = jiffies_to_clock_t(rt_expires);
2740 }
2741 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2742 0, dev, expires, flags,
2743 GFP_ATOMIC);
2744 }
2745 fib6_info_release(rt);
2746 }
2747
2748 /* Try to figure out our local address for this prefix */
2749
2750 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2751 struct in6_addr addr;
2752 bool tokenized = false, dev_addr_generated = false;
2753
2754 if (pinfo->prefix_len == 64) {
2755 memcpy(&addr, &pinfo->prefix, 8);
2756
2757 if (!ipv6_addr_any(&in6_dev->token)) {
2758 read_lock_bh(&in6_dev->lock);
2759 memcpy(addr.s6_addr + 8,
2760 in6_dev->token.s6_addr + 8, 8);
2761 read_unlock_bh(&in6_dev->lock);
2762 tokenized = true;
2763 } else if (is_addr_mode_generate_stable(in6_dev) &&
2764 !ipv6_generate_stable_address(&addr, 0,
2765 in6_dev)) {
2766 addr_flags |= IFA_F_STABLE_PRIVACY;
2767 goto ok;
2768 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2769 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2770 goto put;
2771 } else {
2772 dev_addr_generated = true;
2773 }
2774 goto ok;
2775 }
2776 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2777 pinfo->prefix_len);
2778 goto put;
2779
2780 ok:
2781 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2782 &addr, addr_type,
2783 addr_flags, sllao,
2784 tokenized, valid_lft,
2785 prefered_lft);
2786 if (err)
2787 goto put;
2788
2789 /* Ignore error case here because previous prefix add addr was
2790 * successful which will be notified.
2791 */
2792 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2793 addr_type, addr_flags, sllao,
2794 tokenized, valid_lft,
2795 prefered_lft,
2796 dev_addr_generated);
2797 }
2798 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2799 put:
2800 in6_dev_put(in6_dev);
2801 }
2802
2803 /*
2804 * Set destination address.
2805 * Special case for SIT interfaces where we create a new "virtual"
2806 * device.
2807 */
2808 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2809 {
2810 struct in6_ifreq ireq;
2811 struct net_device *dev;
2812 int err = -EINVAL;
2813
2814 rtnl_lock();
2815
2816 err = -EFAULT;
2817 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2818 goto err_exit;
2819
2820 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2821
2822 err = -ENODEV;
2823 if (!dev)
2824 goto err_exit;
2825
2826 #if IS_ENABLED(CONFIG_IPV6_SIT)
2827 if (dev->type == ARPHRD_SIT) {
2828 const struct net_device_ops *ops = dev->netdev_ops;
2829 struct ifreq ifr;
2830 struct ip_tunnel_parm p;
2831
2832 err = -EADDRNOTAVAIL;
2833 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2834 goto err_exit;
2835
2836 memset(&p, 0, sizeof(p));
2837 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2838 p.iph.saddr = 0;
2839 p.iph.version = 4;
2840 p.iph.ihl = 5;
2841 p.iph.protocol = IPPROTO_IPV6;
2842 p.iph.ttl = 64;
2843 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2844
2845 if (ops->ndo_do_ioctl) {
2846 mm_segment_t oldfs = get_fs();
2847
2848 set_fs(KERNEL_DS);
2849 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2850 set_fs(oldfs);
2851 } else
2852 err = -EOPNOTSUPP;
2853
2854 if (err == 0) {
2855 err = -ENOBUFS;
2856 dev = __dev_get_by_name(net, p.name);
2857 if (!dev)
2858 goto err_exit;
2859 err = dev_open(dev, NULL);
2860 }
2861 }
2862 #endif
2863
2864 err_exit:
2865 rtnl_unlock();
2866 return err;
2867 }
2868
2869 static int ipv6_mc_config(struct sock *sk, bool join,
2870 const struct in6_addr *addr, int ifindex)
2871 {
2872 int ret;
2873
2874 ASSERT_RTNL();
2875
2876 lock_sock(sk);
2877 if (join)
2878 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2879 else
2880 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2881 release_sock(sk);
2882
2883 return ret;
2884 }
2885
2886 /*
2887 * Manual configuration of address on an interface
2888 */
2889 static int inet6_addr_add(struct net *net, int ifindex,
2890 struct ifa6_config *cfg,
2891 struct netlink_ext_ack *extack)
2892 {
2893 struct inet6_ifaddr *ifp;
2894 struct inet6_dev *idev;
2895 struct net_device *dev;
2896 unsigned long timeout;
2897 clock_t expires;
2898 u32 flags;
2899
2900 ASSERT_RTNL();
2901
2902 if (cfg->plen > 128)
2903 return -EINVAL;
2904
2905 /* check the lifetime */
2906 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2907 return -EINVAL;
2908
2909 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2910 return -EINVAL;
2911
2912 dev = __dev_get_by_index(net, ifindex);
2913 if (!dev)
2914 return -ENODEV;
2915
2916 idev = addrconf_add_dev(dev);
2917 if (IS_ERR(idev))
2918 return PTR_ERR(idev);
2919
2920 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2921 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2922 true, cfg->pfx, ifindex);
2923
2924 if (ret < 0)
2925 return ret;
2926 }
2927
2928 cfg->scope = ipv6_addr_scope(cfg->pfx);
2929
2930 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2931 if (addrconf_finite_timeout(timeout)) {
2932 expires = jiffies_to_clock_t(timeout * HZ);
2933 cfg->valid_lft = timeout;
2934 flags = RTF_EXPIRES;
2935 } else {
2936 expires = 0;
2937 flags = 0;
2938 cfg->ifa_flags |= IFA_F_PERMANENT;
2939 }
2940
2941 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2942 if (addrconf_finite_timeout(timeout)) {
2943 if (timeout == 0)
2944 cfg->ifa_flags |= IFA_F_DEPRECATED;
2945 cfg->preferred_lft = timeout;
2946 }
2947
2948 ifp = ipv6_add_addr(idev, cfg, true, extack);
2949 if (!IS_ERR(ifp)) {
2950 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2951 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2952 ifp->rt_priority, dev, expires,
2953 flags, GFP_KERNEL);
2954 }
2955
2956 /* Send a netlink notification if DAD is enabled and
2957 * optimistic flag is not set
2958 */
2959 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2960 ipv6_ifa_notify(0, ifp);
2961 /*
2962 * Note that section 3.1 of RFC 4429 indicates
2963 * that the Optimistic flag should not be set for
2964 * manually configured addresses
2965 */
2966 addrconf_dad_start(ifp);
2967 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2968 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2969 cfg->preferred_lft, true, jiffies);
2970 in6_ifa_put(ifp);
2971 addrconf_verify_rtnl();
2972 return 0;
2973 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2974 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2975 cfg->pfx, ifindex);
2976 }
2977
2978 return PTR_ERR(ifp);
2979 }
2980
2981 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2982 const struct in6_addr *pfx, unsigned int plen)
2983 {
2984 struct inet6_ifaddr *ifp;
2985 struct inet6_dev *idev;
2986 struct net_device *dev;
2987
2988 if (plen > 128)
2989 return -EINVAL;
2990
2991 dev = __dev_get_by_index(net, ifindex);
2992 if (!dev)
2993 return -ENODEV;
2994
2995 idev = __in6_dev_get(dev);
2996 if (!idev)
2997 return -ENXIO;
2998
2999 read_lock_bh(&idev->lock);
3000 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3001 if (ifp->prefix_len == plen &&
3002 ipv6_addr_equal(pfx, &ifp->addr)) {
3003 in6_ifa_hold(ifp);
3004 read_unlock_bh(&idev->lock);
3005
3006 if (!(ifp->flags & IFA_F_TEMPORARY) &&
3007 (ifa_flags & IFA_F_MANAGETEMPADDR))
3008 manage_tempaddrs(idev, ifp, 0, 0, false,
3009 jiffies);
3010 ipv6_del_addr(ifp);
3011 addrconf_verify_rtnl();
3012 if (ipv6_addr_is_multicast(pfx)) {
3013 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
3014 false, pfx, dev->ifindex);
3015 }
3016 return 0;
3017 }
3018 }
3019 read_unlock_bh(&idev->lock);
3020 return -EADDRNOTAVAIL;
3021 }
3022
3023
3024 int addrconf_add_ifaddr(struct net *net, void __user *arg)
3025 {
3026 struct ifa6_config cfg = {
3027 .ifa_flags = IFA_F_PERMANENT,
3028 .preferred_lft = INFINITY_LIFE_TIME,
3029 .valid_lft = INFINITY_LIFE_TIME,
3030 };
3031 struct in6_ifreq ireq;
3032 int err;
3033
3034 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3035 return -EPERM;
3036
3037 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3038 return -EFAULT;
3039
3040 cfg.pfx = &ireq.ifr6_addr;
3041 cfg.plen = ireq.ifr6_prefixlen;
3042
3043 rtnl_lock();
3044 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3045 rtnl_unlock();
3046 return err;
3047 }
3048
3049 int addrconf_del_ifaddr(struct net *net, void __user *arg)
3050 {
3051 struct in6_ifreq ireq;
3052 int err;
3053
3054 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3055 return -EPERM;
3056
3057 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3058 return -EFAULT;
3059
3060 rtnl_lock();
3061 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3062 ireq.ifr6_prefixlen);
3063 rtnl_unlock();
3064 return err;
3065 }
3066
3067 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3068 int plen, int scope)
3069 {
3070 struct inet6_ifaddr *ifp;
3071 struct ifa6_config cfg = {
3072 .pfx = addr,
3073 .plen = plen,
3074 .ifa_flags = IFA_F_PERMANENT,
3075 .valid_lft = INFINITY_LIFE_TIME,
3076 .preferred_lft = INFINITY_LIFE_TIME,
3077 .scope = scope
3078 };
3079
3080 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3081 if (!IS_ERR(ifp)) {
3082 spin_lock_bh(&ifp->lock);
3083 ifp->flags &= ~IFA_F_TENTATIVE;
3084 spin_unlock_bh(&ifp->lock);
3085 rt_genid_bump_ipv6(dev_net(idev->dev));
3086 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3087 in6_ifa_put(ifp);
3088 }
3089 }
3090
3091 #if IS_ENABLED(CONFIG_IPV6_SIT)
3092 static void sit_add_v4_addrs(struct inet6_dev *idev)
3093 {
3094 struct in6_addr addr;
3095 struct net_device *dev;
3096 struct net *net = dev_net(idev->dev);
3097 int scope, plen;
3098 u32 pflags = 0;
3099
3100 ASSERT_RTNL();
3101
3102 memset(&addr, 0, sizeof(struct in6_addr));
3103 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3104
3105 if (idev->dev->flags&IFF_POINTOPOINT) {
3106 addr.s6_addr32[0] = htonl(0xfe800000);
3107 scope = IFA_LINK;
3108 plen = 64;
3109 } else {
3110 scope = IPV6_ADDR_COMPATv4;
3111 plen = 96;
3112 pflags |= RTF_NONEXTHOP;
3113 }
3114
3115 if (addr.s6_addr32[3]) {
3116 add_addr(idev, &addr, plen, scope);
3117 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3118 GFP_KERNEL);
3119 return;
3120 }
3121
3122 for_each_netdev(net, dev) {
3123 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3124 if (in_dev && (dev->flags & IFF_UP)) {
3125 struct in_ifaddr *ifa;
3126
3127 int flag = scope;
3128
3129 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
3130
3131 addr.s6_addr32[3] = ifa->ifa_local;
3132
3133 if (ifa->ifa_scope == RT_SCOPE_LINK)
3134 continue;
3135 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3136 if (idev->dev->flags&IFF_POINTOPOINT)
3137 continue;
3138 flag |= IFA_HOST;
3139 }
3140
3141 add_addr(idev, &addr, plen, flag);
3142 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3143 0, pflags, GFP_KERNEL);
3144 }
3145 }
3146 }
3147 }
3148 #endif
3149
3150 static void init_loopback(struct net_device *dev)
3151 {
3152 struct inet6_dev *idev;
3153
3154 /* ::1 */
3155
3156 ASSERT_RTNL();
3157
3158 idev = ipv6_find_idev(dev);
3159 if (!idev) {
3160 pr_debug("%s: add_dev failed\n", __func__);
3161 return;
3162 }
3163
3164 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3165 }
3166
3167 void addrconf_add_linklocal(struct inet6_dev *idev,
3168 const struct in6_addr *addr, u32 flags)
3169 {
3170 struct ifa6_config cfg = {
3171 .pfx = addr,
3172 .plen = 64,
3173 .ifa_flags = flags | IFA_F_PERMANENT,
3174 .valid_lft = INFINITY_LIFE_TIME,
3175 .preferred_lft = INFINITY_LIFE_TIME,
3176 .scope = IFA_LINK
3177 };
3178 struct inet6_ifaddr *ifp;
3179
3180 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3181 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3182 idev->cnf.optimistic_dad) &&
3183 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3184 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3185 #endif
3186
3187 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3188 if (!IS_ERR(ifp)) {
3189 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3190 0, 0, GFP_ATOMIC);
3191 addrconf_dad_start(ifp);
3192 in6_ifa_put(ifp);
3193 }
3194 }
3195 EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3196
3197 static bool ipv6_reserved_interfaceid(struct in6_addr address)
3198 {
3199 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3200 return true;
3201
3202 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3203 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3204 return true;
3205
3206 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3207 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3208 return true;
3209
3210 return false;
3211 }
3212
3213 static int ipv6_generate_stable_address(struct in6_addr *address,
3214 u8 dad_count,
3215 const struct inet6_dev *idev)
3216 {
3217 static DEFINE_SPINLOCK(lock);
3218 static __u32 digest[SHA_DIGEST_WORDS];
3219 static __u32 workspace[SHA_WORKSPACE_WORDS];
3220
3221 static union {
3222 char __data[SHA_MESSAGE_BYTES];
3223 struct {
3224 struct in6_addr secret;
3225 __be32 prefix[2];
3226 unsigned char hwaddr[MAX_ADDR_LEN];
3227 u8 dad_count;
3228 } __packed;
3229 } data;
3230
3231 struct in6_addr secret;
3232 struct in6_addr temp;
3233 struct net *net = dev_net(idev->dev);
3234
3235 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3236
3237 if (idev->cnf.stable_secret.initialized)
3238 secret = idev->cnf.stable_secret.secret;
3239 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3240 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3241 else
3242 return -1;
3243
3244 retry:
3245 spin_lock_bh(&lock);
3246
3247 sha_init(digest);
3248 memset(&data, 0, sizeof(data));
3249 memset(workspace, 0, sizeof(workspace));
3250 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3251 data.prefix[0] = address->s6_addr32[0];
3252 data.prefix[1] = address->s6_addr32[1];
3253 data.secret = secret;
3254 data.dad_count = dad_count;
3255
3256 sha_transform(digest, data.__data, workspace);
3257
3258 temp = *address;
3259 temp.s6_addr32[2] = (__force __be32)digest[0];
3260 temp.s6_addr32[3] = (__force __be32)digest[1];
3261
3262 spin_unlock_bh(&lock);
3263
3264 if (ipv6_reserved_interfaceid(temp)) {
3265 dad_count++;
3266 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3267 return -1;
3268 goto retry;
3269 }
3270
3271 *address = temp;
3272 return 0;
3273 }
3274
3275 static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3276 {
3277 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3278
3279 if (s->initialized)
3280 return;
3281 s = &idev->cnf.stable_secret;
3282 get_random_bytes(&s->secret, sizeof(s->secret));
3283 s->initialized = true;
3284 }
3285
3286 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3287 {
3288 struct in6_addr addr;
3289
3290 /* no link local addresses on L3 master devices */
3291 if (netif_is_l3_master(idev->dev))
3292 return;
3293
3294 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3295
3296 switch (idev->cnf.addr_gen_mode) {
3297 case IN6_ADDR_GEN_MODE_RANDOM:
3298 ipv6_gen_mode_random_init(idev);
3299 /* fallthrough */
3300 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3301 if (!ipv6_generate_stable_address(&addr, 0, idev))
3302 addrconf_add_linklocal(idev, &addr,
3303 IFA_F_STABLE_PRIVACY);
3304 else if (prefix_route)
3305 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3306 0, 0, GFP_KERNEL);
3307 break;
3308 case IN6_ADDR_GEN_MODE_EUI64:
3309 /* addrconf_add_linklocal also adds a prefix_route and we
3310 * only need to care about prefix routes if ipv6_generate_eui64
3311 * couldn't generate one.
3312 */
3313 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3314 addrconf_add_linklocal(idev, &addr, 0);
3315 else if (prefix_route)
3316 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3317 0, 0, GFP_KERNEL);
3318 break;
3319 case IN6_ADDR_GEN_MODE_NONE:
3320 default:
3321 /* will not add any link local address */
3322 break;
3323 }
3324 }
3325
3326 static void addrconf_dev_config(struct net_device *dev)
3327 {
3328 struct inet6_dev *idev;
3329
3330 ASSERT_RTNL();
3331
3332 if ((dev->type != ARPHRD_ETHER) &&
3333 (dev->type != ARPHRD_FDDI) &&
3334 (dev->type != ARPHRD_ARCNET) &&
3335 (dev->type != ARPHRD_INFINIBAND) &&
3336 (dev->type != ARPHRD_IEEE1394) &&
3337 (dev->type != ARPHRD_TUNNEL6) &&
3338 (dev->type != ARPHRD_6LOWPAN) &&
3339 (dev->type != ARPHRD_IP6GRE) &&
3340 (dev->type != ARPHRD_IPGRE) &&
3341 (dev->type != ARPHRD_TUNNEL) &&
3342 (dev->type != ARPHRD_NONE) &&
3343 (dev->type != ARPHRD_RAWIP)) {
3344 /* Alas, we support only Ethernet autoconfiguration. */
3345 return;
3346 }
3347
3348 idev = addrconf_add_dev(dev);
3349 if (IS_ERR(idev))
3350 return;
3351
3352 /* this device type has no EUI support */
3353 if (dev->type == ARPHRD_NONE &&
3354 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3355 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3356
3357 addrconf_addr_gen(idev, false);
3358 }
3359
3360 #if IS_ENABLED(CONFIG_IPV6_SIT)
3361 static void addrconf_sit_config(struct net_device *dev)
3362 {
3363 struct inet6_dev *idev;
3364
3365 ASSERT_RTNL();
3366
3367 /*
3368 * Configure the tunnel with one of our IPv4
3369 * addresses... we should configure all of
3370 * our v4 addrs in the tunnel
3371 */
3372
3373 idev = ipv6_find_idev(dev);
3374 if (!idev) {
3375 pr_debug("%s: add_dev failed\n", __func__);
3376 return;
3377 }
3378
3379 if (dev->priv_flags & IFF_ISATAP) {
3380 addrconf_addr_gen(idev, false);
3381 return;
3382 }
3383
3384 sit_add_v4_addrs(idev);
3385
3386 if (dev->flags&IFF_POINTOPOINT)
3387 addrconf_add_mroute(dev);
3388 }
3389 #endif
3390
3391 #if IS_ENABLED(CONFIG_NET_IPGRE)
3392 static void addrconf_gre_config(struct net_device *dev)
3393 {
3394 struct inet6_dev *idev;
3395
3396 ASSERT_RTNL();
3397
3398 idev = ipv6_find_idev(dev);
3399 if (!idev) {
3400 pr_debug("%s: add_dev failed\n", __func__);
3401 return;
3402 }
3403
3404 addrconf_addr_gen(idev, true);
3405 if (dev->flags & IFF_POINTOPOINT)
3406 addrconf_add_mroute(dev);
3407 }
3408 #endif
3409
3410 static int fixup_permanent_addr(struct net *net,
3411 struct inet6_dev *idev,
3412 struct inet6_ifaddr *ifp)
3413 {
3414 /* !fib6_node means the host route was removed from the
3415 * FIB, for example, if 'lo' device is taken down. In that
3416 * case regenerate the host route.
3417 */
3418 if (!ifp->rt || !ifp->rt->fib6_node) {
3419 struct fib6_info *f6i, *prev;
3420
3421 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3422 GFP_ATOMIC);
3423 if (IS_ERR(f6i))
3424 return PTR_ERR(f6i);
3425
3426 /* ifp->rt can be accessed outside of rtnl */
3427 spin_lock(&ifp->lock);
3428 prev = ifp->rt;
3429 ifp->rt = f6i;
3430 spin_unlock(&ifp->lock);
3431
3432 fib6_info_release(prev);
3433 }
3434
3435 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3436 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3437 ifp->rt_priority, idev->dev, 0, 0,
3438 GFP_ATOMIC);
3439 }
3440
3441 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3442 addrconf_dad_start(ifp);
3443
3444 return 0;
3445 }
3446
3447 static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3448 {
3449 struct inet6_ifaddr *ifp, *tmp;
3450 struct inet6_dev *idev;
3451
3452 idev = __in6_dev_get(dev);
3453 if (!idev)
3454 return;
3455
3456 write_lock_bh(&idev->lock);
3457
3458 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3459 if ((ifp->flags & IFA_F_PERMANENT) &&
3460 fixup_permanent_addr(net, idev, ifp) < 0) {
3461 write_unlock_bh(&idev->lock);
3462 in6_ifa_hold(ifp);
3463 ipv6_del_addr(ifp);
3464 write_lock_bh(&idev->lock);
3465
3466 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3467 idev->dev->name, &ifp->addr);
3468 }
3469 }
3470
3471 write_unlock_bh(&idev->lock);
3472 }
3473
3474 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3475 void *ptr)
3476 {
3477 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3478 struct netdev_notifier_change_info *change_info;
3479 struct netdev_notifier_changeupper_info *info;
3480 struct inet6_dev *idev = __in6_dev_get(dev);
3481 struct net *net = dev_net(dev);
3482 int run_pending = 0;
3483 int err;
3484
3485 switch (event) {
3486 case NETDEV_REGISTER:
3487 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3488 idev = ipv6_add_dev(dev);
3489 if (IS_ERR(idev))
3490 return notifier_from_errno(PTR_ERR(idev));
3491 }
3492 break;
3493
3494 case NETDEV_CHANGEMTU:
3495 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3496 if (dev->mtu < IPV6_MIN_MTU) {
3497 addrconf_ifdown(dev, dev != net->loopback_dev);
3498 break;
3499 }
3500
3501 if (idev) {
3502 rt6_mtu_change(dev, dev->mtu);
3503 idev->cnf.mtu6 = dev->mtu;
3504 break;
3505 }
3506
3507 /* allocate new idev */
3508 idev = ipv6_add_dev(dev);
3509 if (IS_ERR(idev))
3510 break;
3511
3512 /* device is still not ready */
3513 if (!(idev->if_flags & IF_READY))
3514 break;
3515
3516 run_pending = 1;
3517
3518 /* fall through */
3519
3520 case NETDEV_UP:
3521 case NETDEV_CHANGE:
3522 if (dev->flags & IFF_SLAVE)
3523 break;
3524
3525 if (idev && idev->cnf.disable_ipv6)
3526 break;
3527
3528 if (event == NETDEV_UP) {
3529 /* restore routes for permanent addresses */
3530 addrconf_permanent_addr(net, dev);
3531
3532 if (!addrconf_link_ready(dev)) {
3533 /* device is not ready yet. */
3534 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3535 dev->name);
3536 break;
3537 }
3538
3539 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3540 idev = ipv6_add_dev(dev);
3541
3542 if (!IS_ERR_OR_NULL(idev)) {
3543 idev->if_flags |= IF_READY;
3544 run_pending = 1;
3545 }
3546 } else if (event == NETDEV_CHANGE) {
3547 if (!addrconf_link_ready(dev)) {
3548 /* device is still not ready. */
3549 rt6_sync_down_dev(dev, event);
3550 break;
3551 }
3552
3553 if (!IS_ERR_OR_NULL(idev)) {
3554 if (idev->if_flags & IF_READY) {
3555 /* device is already configured -
3556 * but resend MLD reports, we might
3557 * have roamed and need to update
3558 * multicast snooping switches
3559 */
3560 ipv6_mc_up(idev);
3561 change_info = ptr;
3562 if (change_info->flags_changed & IFF_NOARP)
3563 addrconf_dad_run(idev, true);
3564 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3565 break;
3566 }
3567 idev->if_flags |= IF_READY;
3568 }
3569
3570 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3571 dev->name);
3572
3573 run_pending = 1;
3574 }
3575
3576 switch (dev->type) {
3577 #if IS_ENABLED(CONFIG_IPV6_SIT)
3578 case ARPHRD_SIT:
3579 addrconf_sit_config(dev);
3580 break;
3581 #endif
3582 #if IS_ENABLED(CONFIG_NET_IPGRE)
3583 case ARPHRD_IPGRE:
3584 addrconf_gre_config(dev);
3585 break;
3586 #endif
3587 case ARPHRD_LOOPBACK:
3588 init_loopback(dev);
3589 break;
3590
3591 default:
3592 addrconf_dev_config(dev);
3593 break;
3594 }
3595
3596 if (!IS_ERR_OR_NULL(idev)) {
3597 if (run_pending)
3598 addrconf_dad_run(idev, false);
3599
3600 /* Device has an address by now */
3601 rt6_sync_up(dev, RTNH_F_DEAD);
3602
3603 /*
3604 * If the MTU changed during the interface down,
3605 * when the interface up, the changed MTU must be
3606 * reflected in the idev as well as routers.
3607 */
3608 if (idev->cnf.mtu6 != dev->mtu &&
3609 dev->mtu >= IPV6_MIN_MTU) {
3610 rt6_mtu_change(dev, dev->mtu);
3611 idev->cnf.mtu6 = dev->mtu;
3612 }
3613 idev->tstamp = jiffies;
3614 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3615
3616 /*
3617 * If the changed mtu during down is lower than
3618 * IPV6_MIN_MTU stop IPv6 on this interface.
3619 */
3620 if (dev->mtu < IPV6_MIN_MTU)
3621 addrconf_ifdown(dev, dev != net->loopback_dev);
3622 }
3623 break;
3624
3625 case NETDEV_DOWN:
3626 case NETDEV_UNREGISTER:
3627 /*
3628 * Remove all addresses from this interface.
3629 */
3630 addrconf_ifdown(dev, event != NETDEV_DOWN);
3631 break;
3632
3633 case NETDEV_CHANGENAME:
3634 if (idev) {
3635 snmp6_unregister_dev(idev);
3636 addrconf_sysctl_unregister(idev);
3637 err = addrconf_sysctl_register(idev);
3638 if (err)
3639 return notifier_from_errno(err);
3640 err = snmp6_register_dev(idev);
3641 if (err) {
3642 addrconf_sysctl_unregister(idev);
3643 return notifier_from_errno(err);
3644 }
3645 }
3646 break;
3647
3648 case NETDEV_PRE_TYPE_CHANGE:
3649 case NETDEV_POST_TYPE_CHANGE:
3650 if (idev)
3651 addrconf_type_change(dev, event);
3652 break;
3653
3654 case NETDEV_CHANGEUPPER:
3655 info = ptr;
3656
3657 /* flush all routes if dev is linked to or unlinked from
3658 * an L3 master device (e.g., VRF)
3659 */
3660 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3661 addrconf_ifdown(dev, 0);
3662 }
3663
3664 return NOTIFY_OK;
3665 }
3666
3667 /*
3668 * addrconf module should be notified of a device going up
3669 */
3670 static struct notifier_block ipv6_dev_notf = {
3671 .notifier_call = addrconf_notify,
3672 .priority = ADDRCONF_NOTIFY_PRIORITY,
3673 };
3674
3675 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3676 {
3677 struct inet6_dev *idev;
3678 ASSERT_RTNL();
3679
3680 idev = __in6_dev_get(dev);
3681
3682 if (event == NETDEV_POST_TYPE_CHANGE)
3683 ipv6_mc_remap(idev);
3684 else if (event == NETDEV_PRE_TYPE_CHANGE)
3685 ipv6_mc_unmap(idev);
3686 }
3687
3688 static bool addr_is_local(const struct in6_addr *addr)
3689 {
3690 return ipv6_addr_type(addr) &
3691 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3692 }
3693
3694 static int addrconf_ifdown(struct net_device *dev, int how)
3695 {
3696 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3697 struct net *net = dev_net(dev);
3698 struct inet6_dev *idev;
3699 struct inet6_ifaddr *ifa, *tmp;
3700 bool keep_addr = false;
3701 int state, i;
3702
3703 ASSERT_RTNL();
3704
3705 rt6_disable_ip(dev, event);
3706
3707 idev = __in6_dev_get(dev);
3708 if (!idev)
3709 return -ENODEV;
3710
3711 /*
3712 * Step 1: remove reference to ipv6 device from parent device.
3713 * Do not dev_put!
3714 */
3715 if (how) {
3716 idev->dead = 1;
3717
3718 /* protected by rtnl_lock */
3719 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3720
3721 /* Step 1.5: remove snmp6 entry */
3722 snmp6_unregister_dev(idev);
3723
3724 }
3725
3726 /* combine the user config with event to determine if permanent
3727 * addresses are to be removed from address hash table
3728 */
3729 if (!how && !idev->cnf.disable_ipv6) {
3730 /* aggregate the system setting and interface setting */
3731 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3732
3733 if (!_keep_addr)
3734 _keep_addr = idev->cnf.keep_addr_on_down;
3735
3736 keep_addr = (_keep_addr > 0);
3737 }
3738
3739 /* Step 2: clear hash table */
3740 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3741 struct hlist_head *h = &inet6_addr_lst[i];
3742
3743 spin_lock_bh(&addrconf_hash_lock);
3744 restart:
3745 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3746 if (ifa->idev == idev) {
3747 addrconf_del_dad_work(ifa);
3748 /* combined flag + permanent flag decide if
3749 * address is retained on a down event
3750 */
3751 if (!keep_addr ||
3752 !(ifa->flags & IFA_F_PERMANENT) ||
3753 addr_is_local(&ifa->addr)) {
3754 hlist_del_init_rcu(&ifa->addr_lst);
3755 goto restart;
3756 }
3757 }
3758 }
3759 spin_unlock_bh(&addrconf_hash_lock);
3760 }
3761
3762 write_lock_bh(&idev->lock);
3763
3764 addrconf_del_rs_timer(idev);
3765
3766 /* Step 2: clear flags for stateless addrconf */
3767 if (!how)
3768 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3769
3770 /* Step 3: clear tempaddr list */
3771 while (!list_empty(&idev->tempaddr_list)) {
3772 ifa = list_first_entry(&idev->tempaddr_list,
3773 struct inet6_ifaddr, tmp_list);
3774 list_del(&ifa->tmp_list);
3775 write_unlock_bh(&idev->lock);
3776 spin_lock_bh(&ifa->lock);
3777
3778 if (ifa->ifpub) {
3779 in6_ifa_put(ifa->ifpub);
3780 ifa->ifpub = NULL;
3781 }
3782 spin_unlock_bh(&ifa->lock);
3783 in6_ifa_put(ifa);
3784 write_lock_bh(&idev->lock);
3785 }
3786
3787 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3788 struct fib6_info *rt = NULL;
3789 bool keep;
3790
3791 addrconf_del_dad_work(ifa);
3792
3793 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3794 !addr_is_local(&ifa->addr);
3795
3796 write_unlock_bh(&idev->lock);
3797 spin_lock_bh(&ifa->lock);
3798
3799 if (keep) {
3800 /* set state to skip the notifier below */
3801 state = INET6_IFADDR_STATE_DEAD;
3802 ifa->state = INET6_IFADDR_STATE_PREDAD;
3803 if (!(ifa->flags & IFA_F_NODAD))
3804 ifa->flags |= IFA_F_TENTATIVE;
3805
3806 rt = ifa->rt;
3807 ifa->rt = NULL;
3808 } else {
3809 state = ifa->state;
3810 ifa->state = INET6_IFADDR_STATE_DEAD;
3811 }
3812
3813 spin_unlock_bh(&ifa->lock);
3814
3815 if (rt)
3816 ip6_del_rt(net, rt);
3817
3818 if (state != INET6_IFADDR_STATE_DEAD) {
3819 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3820 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3821 } else {
3822 if (idev->cnf.forwarding)
3823 addrconf_leave_anycast(ifa);
3824 addrconf_leave_solict(ifa->idev, &ifa->addr);
3825 }
3826
3827 write_lock_bh(&idev->lock);
3828 if (!keep) {
3829 list_del_rcu(&ifa->if_list);
3830 in6_ifa_put(ifa);
3831 }
3832 }
3833
3834 write_unlock_bh(&idev->lock);
3835
3836 /* Step 5: Discard anycast and multicast list */
3837 if (how) {
3838 ipv6_ac_destroy_dev(idev);
3839 ipv6_mc_destroy_dev(idev);
3840 } else {
3841 ipv6_mc_down(idev);
3842 }
3843
3844 idev->tstamp = jiffies;
3845
3846 /* Last: Shot the device (if unregistered) */
3847 if (how) {
3848 addrconf_sysctl_unregister(idev);
3849 neigh_parms_release(&nd_tbl, idev->nd_parms);
3850 neigh_ifdown(&nd_tbl, dev);
3851 in6_dev_put(idev);
3852 }
3853 return 0;
3854 }
3855
3856 static void addrconf_rs_timer(struct timer_list *t)
3857 {
3858 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3859 struct net_device *dev = idev->dev;
3860 struct in6_addr lladdr;
3861
3862 write_lock(&idev->lock);
3863 if (idev->dead || !(idev->if_flags & IF_READY))
3864 goto out;
3865
3866 if (!ipv6_accept_ra(idev))
3867 goto out;
3868
3869 /* Announcement received after solicitation was sent */
3870 if (idev->if_flags & IF_RA_RCVD)
3871 goto out;
3872
3873 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3874 write_unlock(&idev->lock);
3875 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3876 ndisc_send_rs(dev, &lladdr,
3877 &in6addr_linklocal_allrouters);
3878 else
3879 goto put;
3880
3881 write_lock(&idev->lock);
3882 idev->rs_interval = rfc3315_s14_backoff_update(
3883 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3884 /* The wait after the last probe can be shorter */
3885 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3886 idev->cnf.rtr_solicits) ?
3887 idev->cnf.rtr_solicit_delay :
3888 idev->rs_interval);
3889 } else {
3890 /*
3891 * Note: we do not support deprecated "all on-link"
3892 * assumption any longer.
3893 */
3894 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3895 }
3896
3897 out:
3898 write_unlock(&idev->lock);
3899 put:
3900 in6_dev_put(idev);
3901 }
3902
3903 /*
3904 * Duplicate Address Detection
3905 */
3906 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3907 {
3908 unsigned long rand_num;
3909 struct inet6_dev *idev = ifp->idev;
3910 u64 nonce;
3911
3912 if (ifp->flags & IFA_F_OPTIMISTIC)
3913 rand_num = 0;
3914 else
3915 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3916
3917 nonce = 0;
3918 if (idev->cnf.enhanced_dad ||
3919 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3920 do
3921 get_random_bytes(&nonce, 6);
3922 while (nonce == 0);
3923 }
3924 ifp->dad_nonce = nonce;
3925 ifp->dad_probes = idev->cnf.dad_transmits;
3926 addrconf_mod_dad_work(ifp, rand_num);
3927 }
3928
3929 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3930 {
3931 struct inet6_dev *idev = ifp->idev;
3932 struct net_device *dev = idev->dev;
3933 bool bump_id, notify = false;
3934 struct net *net;
3935
3936 addrconf_join_solict(dev, &ifp->addr);
3937
3938 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3939
3940 read_lock_bh(&idev->lock);
3941 spin_lock(&ifp->lock);
3942 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3943 goto out;
3944
3945 net = dev_net(dev);
3946 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3947 (net->ipv6.devconf_all->accept_dad < 1 &&
3948 idev->cnf.accept_dad < 1) ||
3949 !(ifp->flags&IFA_F_TENTATIVE) ||
3950 ifp->flags & IFA_F_NODAD) {
3951 bool send_na = false;
3952
3953 if (ifp->flags & IFA_F_TENTATIVE &&
3954 !(ifp->flags & IFA_F_OPTIMISTIC))
3955 send_na = true;
3956 bump_id = ifp->flags & IFA_F_TENTATIVE;
3957 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3958 spin_unlock(&ifp->lock);
3959 read_unlock_bh(&idev->lock);
3960
3961 addrconf_dad_completed(ifp, bump_id, send_na);
3962 return;
3963 }
3964
3965 if (!(idev->if_flags & IF_READY)) {
3966 spin_unlock(&ifp->lock);
3967 read_unlock_bh(&idev->lock);
3968 /*
3969 * If the device is not ready:
3970 * - keep it tentative if it is a permanent address.
3971 * - otherwise, kill it.
3972 */
3973 in6_ifa_hold(ifp);
3974 addrconf_dad_stop(ifp, 0);
3975 return;
3976 }
3977
3978 /*
3979 * Optimistic nodes can start receiving
3980 * Frames right away
3981 */
3982 if (ifp->flags & IFA_F_OPTIMISTIC) {
3983 ip6_ins_rt(net, ifp->rt);
3984 if (ipv6_use_optimistic_addr(net, idev)) {
3985 /* Because optimistic nodes can use this address,
3986 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3987 */
3988 notify = true;
3989 }
3990 }
3991
3992 addrconf_dad_kick(ifp);
3993 out:
3994 spin_unlock(&ifp->lock);
3995 read_unlock_bh(&idev->lock);
3996 if (notify)
3997 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3998 }
3999
4000 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
4001 {
4002 bool begin_dad = false;
4003
4004 spin_lock_bh(&ifp->lock);
4005 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
4006 ifp->state = INET6_IFADDR_STATE_PREDAD;
4007 begin_dad = true;
4008 }
4009 spin_unlock_bh(&ifp->lock);
4010
4011 if (begin_dad)
4012 addrconf_mod_dad_work(ifp, 0);
4013 }
4014
4015 static void addrconf_dad_work(struct work_struct *w)
4016 {
4017 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
4018 struct inet6_ifaddr,
4019 dad_work);
4020 struct inet6_dev *idev = ifp->idev;
4021 bool bump_id, disable_ipv6 = false;
4022 struct in6_addr mcaddr;
4023
4024 enum {
4025 DAD_PROCESS,
4026 DAD_BEGIN,
4027 DAD_ABORT,
4028 } action = DAD_PROCESS;
4029
4030 rtnl_lock();
4031
4032 spin_lock_bh(&ifp->lock);
4033 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4034 action = DAD_BEGIN;
4035 ifp->state = INET6_IFADDR_STATE_DAD;
4036 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4037 action = DAD_ABORT;
4038 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4039
4040 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4041 idev->cnf.accept_dad > 1) &&
4042 !idev->cnf.disable_ipv6 &&
4043 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4044 struct in6_addr addr;
4045
4046 addr.s6_addr32[0] = htonl(0xfe800000);
4047 addr.s6_addr32[1] = 0;
4048
4049 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4050 ipv6_addr_equal(&ifp->addr, &addr)) {
4051 /* DAD failed for link-local based on MAC */
4052 idev->cnf.disable_ipv6 = 1;
4053
4054 pr_info("%s: IPv6 being disabled!\n",
4055 ifp->idev->dev->name);
4056 disable_ipv6 = true;
4057 }
4058 }
4059 }
4060 spin_unlock_bh(&ifp->lock);
4061
4062 if (action == DAD_BEGIN) {
4063 addrconf_dad_begin(ifp);
4064 goto out;
4065 } else if (action == DAD_ABORT) {
4066 in6_ifa_hold(ifp);
4067 addrconf_dad_stop(ifp, 1);
4068 if (disable_ipv6)
4069 addrconf_ifdown(idev->dev, 0);
4070 goto out;
4071 }
4072
4073 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4074 goto out;
4075
4076 write_lock_bh(&idev->lock);
4077 if (idev->dead || !(idev->if_flags & IF_READY)) {
4078 write_unlock_bh(&idev->lock);
4079 goto out;
4080 }
4081
4082 spin_lock(&ifp->lock);
4083 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4084 spin_unlock(&ifp->lock);
4085 write_unlock_bh(&idev->lock);
4086 goto out;
4087 }
4088
4089 if (ifp->dad_probes == 0) {
4090 bool send_na = false;
4091
4092 /*
4093 * DAD was successful
4094 */
4095
4096 if (ifp->flags & IFA_F_TENTATIVE &&
4097 !(ifp->flags & IFA_F_OPTIMISTIC))
4098 send_na = true;
4099 bump_id = ifp->flags & IFA_F_TENTATIVE;
4100 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4101 spin_unlock(&ifp->lock);
4102 write_unlock_bh(&idev->lock);
4103
4104 addrconf_dad_completed(ifp, bump_id, send_na);
4105
4106 goto out;
4107 }
4108
4109 ifp->dad_probes--;
4110 addrconf_mod_dad_work(ifp,
4111 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
4112 spin_unlock(&ifp->lock);
4113 write_unlock_bh(&idev->lock);
4114
4115 /* send a neighbour solicitation for our addr */
4116 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4117 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4118 ifp->dad_nonce);
4119 out:
4120 in6_ifa_put(ifp);
4121 rtnl_unlock();
4122 }
4123
4124 /* ifp->idev must be at least read locked */
4125 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4126 {
4127 struct inet6_ifaddr *ifpiter;
4128 struct inet6_dev *idev = ifp->idev;
4129
4130 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4131 if (ifpiter->scope > IFA_LINK)
4132 break;
4133 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4134 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4135 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4136 IFA_F_PERMANENT)
4137 return false;
4138 }
4139 return true;
4140 }
4141
4142 static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4143 bool send_na)
4144 {
4145 struct net_device *dev = ifp->idev->dev;
4146 struct in6_addr lladdr;
4147 bool send_rs, send_mld;
4148
4149 addrconf_del_dad_work(ifp);
4150
4151 /*
4152 * Configure the address for reception. Now it is valid.
4153 */
4154
4155 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4156
4157 /* If added prefix is link local and we are prepared to process
4158 router advertisements, start sending router solicitations.
4159 */
4160
4161 read_lock_bh(&ifp->idev->lock);
4162 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4163 send_rs = send_mld &&
4164 ipv6_accept_ra(ifp->idev) &&
4165 ifp->idev->cnf.rtr_solicits != 0 &&
4166 (dev->flags&IFF_LOOPBACK) == 0;
4167 read_unlock_bh(&ifp->idev->lock);
4168
4169 /* While dad is in progress mld report's source address is in6_addrany.
4170 * Resend with proper ll now.
4171 */
4172 if (send_mld)
4173 ipv6_mc_dad_complete(ifp->idev);
4174
4175 /* send unsolicited NA if enabled */
4176 if (send_na &&
4177 (ifp->idev->cnf.ndisc_notify ||
4178 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4179 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4180 /*router=*/ !!ifp->idev->cnf.forwarding,
4181 /*solicited=*/ false, /*override=*/ true,
4182 /*inc_opt=*/ true);
4183 }
4184
4185 if (send_rs) {
4186 /*
4187 * If a host as already performed a random delay
4188 * [...] as part of DAD [...] there is no need
4189 * to delay again before sending the first RS
4190 */
4191 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4192 return;
4193 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4194
4195 write_lock_bh(&ifp->idev->lock);
4196 spin_lock(&ifp->lock);
4197 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4198 ifp->idev->cnf.rtr_solicit_interval);
4199 ifp->idev->rs_probes = 1;
4200 ifp->idev->if_flags |= IF_RS_SENT;
4201 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4202 spin_unlock(&ifp->lock);
4203 write_unlock_bh(&ifp->idev->lock);
4204 }
4205
4206 if (bump_id)
4207 rt_genid_bump_ipv6(dev_net(dev));
4208
4209 /* Make sure that a new temporary address will be created
4210 * before this temporary address becomes deprecated.
4211 */
4212 if (ifp->flags & IFA_F_TEMPORARY)
4213 addrconf_verify_rtnl();
4214 }
4215
4216 static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4217 {
4218 struct inet6_ifaddr *ifp;
4219
4220 read_lock_bh(&idev->lock);
4221 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4222 spin_lock(&ifp->lock);
4223 if ((ifp->flags & IFA_F_TENTATIVE &&
4224 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4225 if (restart)
4226 ifp->state = INET6_IFADDR_STATE_PREDAD;
4227 addrconf_dad_kick(ifp);
4228 }
4229 spin_unlock(&ifp->lock);
4230 }
4231 read_unlock_bh(&idev->lock);
4232 }
4233
4234 #ifdef CONFIG_PROC_FS
4235 struct if6_iter_state {
4236 struct seq_net_private p;
4237 int bucket;
4238 int offset;
4239 };
4240
4241 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4242 {
4243 struct if6_iter_state *state = seq->private;
4244 struct net *net = seq_file_net(seq);
4245 struct inet6_ifaddr *ifa = NULL;
4246 int p = 0;
4247
4248 /* initial bucket if pos is 0 */
4249 if (pos == 0) {
4250 state->bucket = 0;
4251 state->offset = 0;
4252 }
4253
4254 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4255 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4256 addr_lst) {
4257 if (!net_eq(dev_net(ifa->idev->dev), net))
4258 continue;
4259 /* sync with offset */
4260 if (p < state->offset) {
4261 p++;
4262 continue;
4263 }
4264 return ifa;
4265 }
4266
4267 /* prepare for next bucket */
4268 state->offset = 0;
4269 p = 0;
4270 }
4271 return NULL;
4272 }
4273
4274 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4275 struct inet6_ifaddr *ifa)
4276 {
4277 struct if6_iter_state *state = seq->private;
4278 struct net *net = seq_file_net(seq);
4279
4280 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4281 if (!net_eq(dev_net(ifa->idev->dev), net))
4282 continue;
4283 state->offset++;
4284 return ifa;
4285 }
4286
4287 state->offset = 0;
4288 while (++state->bucket < IN6_ADDR_HSIZE) {
4289 hlist_for_each_entry_rcu(ifa,
4290 &inet6_addr_lst[state->bucket], addr_lst) {
4291 if (!net_eq(dev_net(ifa->idev->dev), net))
4292 continue;
4293 return ifa;
4294 }
4295 }
4296
4297 return NULL;
4298 }
4299
4300 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4301 __acquires(rcu)
4302 {
4303 rcu_read_lock();
4304 return if6_get_first(seq, *pos);
4305 }
4306
4307 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4308 {
4309 struct inet6_ifaddr *ifa;
4310
4311 ifa = if6_get_next(seq, v);
4312 ++*pos;
4313 return ifa;
4314 }
4315
4316 static void if6_seq_stop(struct seq_file *seq, void *v)
4317 __releases(rcu)
4318 {
4319 rcu_read_unlock();
4320 }
4321
4322 static int if6_seq_show(struct seq_file *seq, void *v)
4323 {
4324 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4325 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4326 &ifp->addr,
4327 ifp->idev->dev->ifindex,
4328 ifp->prefix_len,
4329 ifp->scope,
4330 (u8) ifp->flags,
4331 ifp->idev->dev->name);
4332 return 0;
4333 }
4334
4335 static const struct seq_operations if6_seq_ops = {
4336 .start = if6_seq_start,
4337 .next = if6_seq_next,
4338 .show = if6_seq_show,
4339 .stop = if6_seq_stop,
4340 };
4341
4342 static int __net_init if6_proc_net_init(struct net *net)
4343 {
4344 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4345 sizeof(struct if6_iter_state)))
4346 return -ENOMEM;
4347 return 0;
4348 }
4349
4350 static void __net_exit if6_proc_net_exit(struct net *net)
4351 {
4352 remove_proc_entry("if_inet6", net->proc_net);
4353 }
4354
4355 static struct pernet_operations if6_proc_net_ops = {
4356 .init = if6_proc_net_init,
4357 .exit = if6_proc_net_exit,
4358 };
4359
4360 int __init if6_proc_init(void)
4361 {
4362 return register_pernet_subsys(&if6_proc_net_ops);
4363 }
4364
4365 void if6_proc_exit(void)
4366 {
4367 unregister_pernet_subsys(&if6_proc_net_ops);
4368 }
4369 #endif /* CONFIG_PROC_FS */
4370
4371 #if IS_ENABLED(CONFIG_IPV6_MIP6)
4372 /* Check if address is a home address configured on any interface. */
4373 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4374 {
4375 unsigned int hash = inet6_addr_hash(net, addr);
4376 struct inet6_ifaddr *ifp = NULL;
4377 int ret = 0;
4378
4379 rcu_read_lock();
4380 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4381 if (!net_eq(dev_net(ifp->idev->dev), net))
4382 continue;
4383 if (ipv6_addr_equal(&ifp->addr, addr) &&
4384 (ifp->flags & IFA_F_HOMEADDRESS)) {
4385 ret = 1;
4386 break;
4387 }
4388 }
4389 rcu_read_unlock();
4390 return ret;
4391 }
4392 #endif
4393
4394 /*
4395 * Periodic address status verification
4396 */
4397
4398 static void addrconf_verify_rtnl(void)
4399 {
4400 unsigned long now, next, next_sec, next_sched;
4401 struct inet6_ifaddr *ifp;
4402 int i;
4403
4404 ASSERT_RTNL();
4405
4406 rcu_read_lock_bh();
4407 now = jiffies;
4408 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4409
4410 cancel_delayed_work(&addr_chk_work);
4411
4412 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4413 restart:
4414 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4415 unsigned long age;
4416
4417 /* When setting preferred_lft to a value not zero or
4418 * infinity, while valid_lft is infinity
4419 * IFA_F_PERMANENT has a non-infinity life time.
4420 */
4421 if ((ifp->flags & IFA_F_PERMANENT) &&
4422 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4423 continue;
4424
4425 spin_lock(&ifp->lock);
4426 /* We try to batch several events at once. */
4427 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4428
4429 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4430 age >= ifp->valid_lft) {
4431 spin_unlock(&ifp->lock);
4432 in6_ifa_hold(ifp);
4433 ipv6_del_addr(ifp);
4434 goto restart;
4435 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4436 spin_unlock(&ifp->lock);
4437 continue;
4438 } else if (age >= ifp->prefered_lft) {
4439 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
4440 int deprecate = 0;
4441
4442 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4443 deprecate = 1;
4444 ifp->flags |= IFA_F_DEPRECATED;
4445 }
4446
4447 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4448 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4449 next = ifp->tstamp + ifp->valid_lft * HZ;
4450
4451 spin_unlock(&ifp->lock);
4452
4453 if (deprecate) {
4454 in6_ifa_hold(ifp);
4455
4456 ipv6_ifa_notify(0, ifp);
4457 in6_ifa_put(ifp);
4458 goto restart;
4459 }
4460 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4461 !(ifp->flags&IFA_F_TENTATIVE)) {
4462 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4463 ifp->idev->cnf.dad_transmits *
4464 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4465
4466 if (age >= ifp->prefered_lft - regen_advance) {
4467 struct inet6_ifaddr *ifpub = ifp->ifpub;
4468 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4469 next = ifp->tstamp + ifp->prefered_lft * HZ;
4470 if (!ifp->regen_count && ifpub) {
4471 ifp->regen_count++;
4472 in6_ifa_hold(ifp);
4473 in6_ifa_hold(ifpub);
4474 spin_unlock(&ifp->lock);
4475
4476 spin_lock(&ifpub->lock);
4477 ifpub->regen_count = 0;
4478 spin_unlock(&ifpub->lock);
4479 rcu_read_unlock_bh();
4480 ipv6_create_tempaddr(ifpub, ifp, true);
4481 in6_ifa_put(ifpub);
4482 in6_ifa_put(ifp);
4483 rcu_read_lock_bh();
4484 goto restart;
4485 }
4486 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4487 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4488 spin_unlock(&ifp->lock);
4489 } else {
4490 /* ifp->prefered_lft <= ifp->valid_lft */
4491 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4492 next = ifp->tstamp + ifp->prefered_lft * HZ;
4493 spin_unlock(&ifp->lock);
4494 }
4495 }
4496 }
4497
4498 next_sec = round_jiffies_up(next);
4499 next_sched = next;
4500
4501 /* If rounded timeout is accurate enough, accept it. */
4502 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4503 next_sched = next_sec;
4504
4505 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4506 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4507 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4508
4509 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4510 now, next, next_sec, next_sched);
4511 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4512 rcu_read_unlock_bh();
4513 }
4514
4515 static void addrconf_verify_work(struct work_struct *w)
4516 {
4517 rtnl_lock();
4518 addrconf_verify_rtnl();
4519 rtnl_unlock();
4520 }
4521
4522 static void addrconf_verify(void)
4523 {
4524 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4525 }
4526
4527 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4528 struct in6_addr **peer_pfx)
4529 {
4530 struct in6_addr *pfx = NULL;
4531
4532 *peer_pfx = NULL;
4533
4534 if (addr)
4535 pfx = nla_data(addr);
4536
4537 if (local) {
4538 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4539 *peer_pfx = pfx;
4540 pfx = nla_data(local);
4541 }
4542
4543 return pfx;
4544 }
4545
4546 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4547 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4548 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4549 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4550 [IFA_FLAGS] = { .len = sizeof(u32) },
4551 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4552 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4553 };
4554
4555 static int
4556 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4557 struct netlink_ext_ack *extack)
4558 {
4559 struct net *net = sock_net(skb->sk);
4560 struct ifaddrmsg *ifm;
4561 struct nlattr *tb[IFA_MAX+1];
4562 struct in6_addr *pfx, *peer_pfx;
4563 u32 ifa_flags;
4564 int err;
4565
4566 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4567 ifa_ipv6_policy, extack);
4568 if (err < 0)
4569 return err;
4570
4571 ifm = nlmsg_data(nlh);
4572 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4573 if (!pfx)
4574 return -EINVAL;
4575
4576 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4577
4578 /* We ignore other flags so far. */
4579 ifa_flags &= IFA_F_MANAGETEMPADDR;
4580
4581 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4582 ifm->ifa_prefixlen);
4583 }
4584
4585 static int modify_prefix_route(struct inet6_ifaddr *ifp,
4586 unsigned long expires, u32 flags)
4587 {
4588 struct fib6_info *f6i;
4589 u32 prio;
4590
4591 f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len,
4592 ifp->idev->dev, 0, RTF_DEFAULT, true);
4593 if (!f6i)
4594 return -ENOENT;
4595
4596 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4597 if (f6i->fib6_metric != prio) {
4598 /* delete old one */
4599 ip6_del_rt(dev_net(ifp->idev->dev), f6i);
4600
4601 /* add new one */
4602 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4603 ifp->rt_priority, ifp->idev->dev,
4604 expires, flags, GFP_KERNEL);
4605 } else {
4606 if (!expires)
4607 fib6_clean_expires(f6i);
4608 else
4609 fib6_set_expires(f6i, expires);
4610
4611 fib6_info_release(f6i);
4612 }
4613
4614 return 0;
4615 }
4616
4617 static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4618 {
4619 u32 flags;
4620 clock_t expires;
4621 unsigned long timeout;
4622 bool was_managetempaddr;
4623 bool had_prefixroute;
4624
4625 ASSERT_RTNL();
4626
4627 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4628 return -EINVAL;
4629
4630 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4631 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4632 return -EINVAL;
4633
4634 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4635 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4636
4637 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4638 if (addrconf_finite_timeout(timeout)) {
4639 expires = jiffies_to_clock_t(timeout * HZ);
4640 cfg->valid_lft = timeout;
4641 flags = RTF_EXPIRES;
4642 } else {
4643 expires = 0;
4644 flags = 0;
4645 cfg->ifa_flags |= IFA_F_PERMANENT;
4646 }
4647
4648 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4649 if (addrconf_finite_timeout(timeout)) {
4650 if (timeout == 0)
4651 cfg->ifa_flags |= IFA_F_DEPRECATED;
4652 cfg->preferred_lft = timeout;
4653 }
4654
4655 spin_lock_bh(&ifp->lock);
4656 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4657 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4658 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4659 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4660 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4661 IFA_F_NOPREFIXROUTE);
4662 ifp->flags |= cfg->ifa_flags;
4663 ifp->tstamp = jiffies;
4664 ifp->valid_lft = cfg->valid_lft;
4665 ifp->prefered_lft = cfg->preferred_lft;
4666
4667 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4668 ifp->rt_priority = cfg->rt_priority;
4669
4670 spin_unlock_bh(&ifp->lock);
4671 if (!(ifp->flags&IFA_F_TENTATIVE))
4672 ipv6_ifa_notify(0, ifp);
4673
4674 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4675 int rc = -ENOENT;
4676
4677 if (had_prefixroute)
4678 rc = modify_prefix_route(ifp, expires, flags);
4679
4680 /* prefix route could have been deleted; if so restore it */
4681 if (rc == -ENOENT) {
4682 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4683 ifp->rt_priority, ifp->idev->dev,
4684 expires, flags, GFP_KERNEL);
4685 }
4686 } else if (had_prefixroute) {
4687 enum cleanup_prefix_rt_t action;
4688 unsigned long rt_expires;
4689
4690 write_lock_bh(&ifp->idev->lock);
4691 action = check_cleanup_prefix_route(ifp, &rt_expires);
4692 write_unlock_bh(&ifp->idev->lock);
4693
4694 if (action != CLEANUP_PREFIX_RT_NOP) {
4695 cleanup_prefix_route(ifp, rt_expires,
4696 action == CLEANUP_PREFIX_RT_DEL);
4697 }
4698 }
4699
4700 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4701 if (was_managetempaddr &&
4702 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4703 cfg->valid_lft = 0;
4704 cfg->preferred_lft = 0;
4705 }
4706 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4707 cfg->preferred_lft, !was_managetempaddr,
4708 jiffies);
4709 }
4710
4711 addrconf_verify_rtnl();
4712
4713 return 0;
4714 }
4715
4716 static int
4717 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4718 struct netlink_ext_ack *extack)
4719 {
4720 struct net *net = sock_net(skb->sk);
4721 struct ifaddrmsg *ifm;
4722 struct nlattr *tb[IFA_MAX+1];
4723 struct in6_addr *peer_pfx;
4724 struct inet6_ifaddr *ifa;
4725 struct net_device *dev;
4726 struct inet6_dev *idev;
4727 struct ifa6_config cfg;
4728 int err;
4729
4730 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4731 ifa_ipv6_policy, extack);
4732 if (err < 0)
4733 return err;
4734
4735 memset(&cfg, 0, sizeof(cfg));
4736
4737 ifm = nlmsg_data(nlh);
4738 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4739 if (!cfg.pfx)
4740 return -EINVAL;
4741
4742 cfg.peer_pfx = peer_pfx;
4743 cfg.plen = ifm->ifa_prefixlen;
4744 if (tb[IFA_RT_PRIORITY])
4745 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4746
4747 cfg.valid_lft = INFINITY_LIFE_TIME;
4748 cfg.preferred_lft = INFINITY_LIFE_TIME;
4749
4750 if (tb[IFA_CACHEINFO]) {
4751 struct ifa_cacheinfo *ci;
4752
4753 ci = nla_data(tb[IFA_CACHEINFO]);
4754 cfg.valid_lft = ci->ifa_valid;
4755 cfg.preferred_lft = ci->ifa_prefered;
4756 }
4757
4758 dev = __dev_get_by_index(net, ifm->ifa_index);
4759 if (!dev)
4760 return -ENODEV;
4761
4762 if (tb[IFA_FLAGS])
4763 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4764 else
4765 cfg.ifa_flags = ifm->ifa_flags;
4766
4767 /* We ignore other flags so far. */
4768 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4769 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4770 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4771
4772 idev = ipv6_find_idev(dev);
4773 if (!idev)
4774 return -ENOBUFS;
4775
4776 if (!ipv6_allow_optimistic_dad(net, idev))
4777 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4778
4779 if (cfg.ifa_flags & IFA_F_NODAD &&
4780 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4781 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4782 return -EINVAL;
4783 }
4784
4785 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4786 if (!ifa) {
4787 /*
4788 * It would be best to check for !NLM_F_CREATE here but
4789 * userspace already relies on not having to provide this.
4790 */
4791 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4792 }
4793
4794 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4795 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4796 err = -EEXIST;
4797 else
4798 err = inet6_addr_modify(ifa, &cfg);
4799
4800 in6_ifa_put(ifa);
4801
4802 return err;
4803 }
4804
4805 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4806 u8 scope, int ifindex)
4807 {
4808 struct ifaddrmsg *ifm;
4809
4810 ifm = nlmsg_data(nlh);
4811 ifm->ifa_family = AF_INET6;
4812 ifm->ifa_prefixlen = prefixlen;
4813 ifm->ifa_flags = flags;
4814 ifm->ifa_scope = scope;
4815 ifm->ifa_index = ifindex;
4816 }
4817
4818 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4819 unsigned long tstamp, u32 preferred, u32 valid)
4820 {
4821 struct ifa_cacheinfo ci;
4822
4823 ci.cstamp = cstamp_delta(cstamp);
4824 ci.tstamp = cstamp_delta(tstamp);
4825 ci.ifa_prefered = preferred;
4826 ci.ifa_valid = valid;
4827
4828 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4829 }
4830
4831 static inline int rt_scope(int ifa_scope)
4832 {
4833 if (ifa_scope & IFA_HOST)
4834 return RT_SCOPE_HOST;
4835 else if (ifa_scope & IFA_LINK)
4836 return RT_SCOPE_LINK;
4837 else if (ifa_scope & IFA_SITE)
4838 return RT_SCOPE_SITE;
4839 else
4840 return RT_SCOPE_UNIVERSE;
4841 }
4842
4843 static inline int inet6_ifaddr_msgsize(void)
4844 {
4845 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4846 + nla_total_size(16) /* IFA_LOCAL */
4847 + nla_total_size(16) /* IFA_ADDRESS */
4848 + nla_total_size(sizeof(struct ifa_cacheinfo))
4849 + nla_total_size(4) /* IFA_FLAGS */
4850 + nla_total_size(4) /* IFA_RT_PRIORITY */;
4851 }
4852
4853 enum addr_type_t {
4854 UNICAST_ADDR,
4855 MULTICAST_ADDR,
4856 ANYCAST_ADDR,
4857 };
4858
4859 struct inet6_fill_args {
4860 u32 portid;
4861 u32 seq;
4862 int event;
4863 unsigned int flags;
4864 int netnsid;
4865 int ifindex;
4866 enum addr_type_t type;
4867 };
4868
4869 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4870 struct inet6_fill_args *args)
4871 {
4872 struct nlmsghdr *nlh;
4873 u32 preferred, valid;
4874
4875 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4876 sizeof(struct ifaddrmsg), args->flags);
4877 if (!nlh)
4878 return -EMSGSIZE;
4879
4880 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4881 ifa->idev->dev->ifindex);
4882
4883 if (args->netnsid >= 0 &&
4884 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4885 goto error;
4886
4887 if (!((ifa->flags&IFA_F_PERMANENT) &&
4888 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4889 preferred = ifa->prefered_lft;
4890 valid = ifa->valid_lft;
4891 if (preferred != INFINITY_LIFE_TIME) {
4892 long tval = (jiffies - ifa->tstamp)/HZ;
4893 if (preferred > tval)
4894 preferred -= tval;
4895 else
4896 preferred = 0;
4897 if (valid != INFINITY_LIFE_TIME) {
4898 if (valid > tval)
4899 valid -= tval;
4900 else
4901 valid = 0;
4902 }
4903 }
4904 } else {
4905 preferred = INFINITY_LIFE_TIME;
4906 valid = INFINITY_LIFE_TIME;
4907 }
4908
4909 if (!ipv6_addr_any(&ifa->peer_addr)) {
4910 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4911 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4912 goto error;
4913 } else
4914 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4915 goto error;
4916
4917 if (ifa->rt_priority &&
4918 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4919 goto error;
4920
4921 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4922 goto error;
4923
4924 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4925 goto error;
4926
4927 nlmsg_end(skb, nlh);
4928 return 0;
4929
4930 error:
4931 nlmsg_cancel(skb, nlh);
4932 return -EMSGSIZE;
4933 }
4934
4935 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4936 struct inet6_fill_args *args)
4937 {
4938 struct nlmsghdr *nlh;
4939 u8 scope = RT_SCOPE_UNIVERSE;
4940 int ifindex = ifmca->idev->dev->ifindex;
4941
4942 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4943 scope = RT_SCOPE_SITE;
4944
4945 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4946 sizeof(struct ifaddrmsg), args->flags);
4947 if (!nlh)
4948 return -EMSGSIZE;
4949
4950 if (args->netnsid >= 0 &&
4951 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4952 return -EMSGSIZE;
4953
4954 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4955 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4956 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4957 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4958 nlmsg_cancel(skb, nlh);
4959 return -EMSGSIZE;
4960 }
4961
4962 nlmsg_end(skb, nlh);
4963 return 0;
4964 }
4965
4966 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4967 struct inet6_fill_args *args)
4968 {
4969 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
4970 int ifindex = dev ? dev->ifindex : 1;
4971 struct nlmsghdr *nlh;
4972 u8 scope = RT_SCOPE_UNIVERSE;
4973
4974 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4975 scope = RT_SCOPE_SITE;
4976
4977 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4978 sizeof(struct ifaddrmsg), args->flags);
4979 if (!nlh)
4980 return -EMSGSIZE;
4981
4982 if (args->netnsid >= 0 &&
4983 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4984 return -EMSGSIZE;
4985
4986 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4987 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4988 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4989 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4990 nlmsg_cancel(skb, nlh);
4991 return -EMSGSIZE;
4992 }
4993
4994 nlmsg_end(skb, nlh);
4995 return 0;
4996 }
4997
4998 /* called with rcu_read_lock() */
4999 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5000 struct netlink_callback *cb, int s_ip_idx,
5001 struct inet6_fill_args *fillargs)
5002 {
5003 struct ifmcaddr6 *ifmca;
5004 struct ifacaddr6 *ifaca;
5005 int ip_idx = 0;
5006 int err = 1;
5007
5008 read_lock_bh(&idev->lock);
5009 switch (fillargs->type) {
5010 case UNICAST_ADDR: {
5011 struct inet6_ifaddr *ifa;
5012 fillargs->event = RTM_NEWADDR;
5013
5014 /* unicast address incl. temp addr */
5015 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5016 if (ip_idx < s_ip_idx)
5017 goto next;
5018 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5019 if (err < 0)
5020 break;
5021 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5022 next:
5023 ip_idx++;
5024 }
5025 break;
5026 }
5027 case MULTICAST_ADDR:
5028 fillargs->event = RTM_GETMULTICAST;
5029
5030 /* multicast address */
5031 for (ifmca = idev->mc_list; ifmca;
5032 ifmca = ifmca->next, ip_idx++) {
5033 if (ip_idx < s_ip_idx)
5034 continue;
5035 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5036 if (err < 0)
5037 break;
5038 }
5039 break;
5040 case ANYCAST_ADDR:
5041 fillargs->event = RTM_GETANYCAST;
5042 /* anycast address */
5043 for (ifaca = idev->ac_list; ifaca;
5044 ifaca = ifaca->aca_next, ip_idx++) {
5045 if (ip_idx < s_ip_idx)
5046 continue;
5047 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5048 if (err < 0)
5049 break;
5050 }
5051 break;
5052 default:
5053 break;
5054 }
5055 read_unlock_bh(&idev->lock);
5056 cb->args[2] = ip_idx;
5057 return err;
5058 }
5059
5060 static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5061 struct inet6_fill_args *fillargs,
5062 struct net **tgt_net, struct sock *sk,
5063 struct netlink_callback *cb)
5064 {
5065 struct netlink_ext_ack *extack = cb->extack;
5066 struct nlattr *tb[IFA_MAX+1];
5067 struct ifaddrmsg *ifm;
5068 int err, i;
5069
5070 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5071 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5072 return -EINVAL;
5073 }
5074
5075 ifm = nlmsg_data(nlh);
5076 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5077 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5078 return -EINVAL;
5079 }
5080
5081 fillargs->ifindex = ifm->ifa_index;
5082 if (fillargs->ifindex) {
5083 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5084 fillargs->flags |= NLM_F_DUMP_FILTERED;
5085 }
5086
5087 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5088 ifa_ipv6_policy, extack);
5089 if (err < 0)
5090 return err;
5091
5092 for (i = 0; i <= IFA_MAX; ++i) {
5093 if (!tb[i])
5094 continue;
5095
5096 if (i == IFA_TARGET_NETNSID) {
5097 struct net *net;
5098
5099 fillargs->netnsid = nla_get_s32(tb[i]);
5100 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5101 if (IS_ERR(net)) {
5102 fillargs->netnsid = -1;
5103 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5104 return PTR_ERR(net);
5105 }
5106 *tgt_net = net;
5107 } else {
5108 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5109 return -EINVAL;
5110 }
5111 }
5112
5113 return 0;
5114 }
5115
5116 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5117 enum addr_type_t type)
5118 {
5119 const struct nlmsghdr *nlh = cb->nlh;
5120 struct inet6_fill_args fillargs = {
5121 .portid = NETLINK_CB(cb->skb).portid,
5122 .seq = cb->nlh->nlmsg_seq,
5123 .flags = NLM_F_MULTI,
5124 .netnsid = -1,
5125 .type = type,
5126 };
5127 struct net *net = sock_net(skb->sk);
5128 struct net *tgt_net = net;
5129 int idx, s_idx, s_ip_idx;
5130 int h, s_h;
5131 struct net_device *dev;
5132 struct inet6_dev *idev;
5133 struct hlist_head *head;
5134 int err = 0;
5135
5136 s_h = cb->args[0];
5137 s_idx = idx = cb->args[1];
5138 s_ip_idx = cb->args[2];
5139
5140 if (cb->strict_check) {
5141 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5142 skb->sk, cb);
5143 if (err < 0)
5144 goto put_tgt_net;
5145
5146 err = 0;
5147 if (fillargs.ifindex) {
5148 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5149 if (!dev) {
5150 err = -ENODEV;
5151 goto put_tgt_net;
5152 }
5153 idev = __in6_dev_get(dev);
5154 if (idev) {
5155 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5156 &fillargs);
5157 if (err > 0)
5158 err = 0;
5159 }
5160 goto put_tgt_net;
5161 }
5162 }
5163
5164 rcu_read_lock();
5165 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5166 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5167 idx = 0;
5168 head = &tgt_net->dev_index_head[h];
5169 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5170 if (idx < s_idx)
5171 goto cont;
5172 if (h > s_h || idx > s_idx)
5173 s_ip_idx = 0;
5174 idev = __in6_dev_get(dev);
5175 if (!idev)
5176 goto cont;
5177
5178 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5179 &fillargs) < 0)
5180 goto done;
5181 cont:
5182 idx++;
5183 }
5184 }
5185 done:
5186 rcu_read_unlock();
5187 cb->args[0] = h;
5188 cb->args[1] = idx;
5189 put_tgt_net:
5190 if (fillargs.netnsid >= 0)
5191 put_net(tgt_net);
5192
5193 return skb->len ? : err;
5194 }
5195
5196 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5197 {
5198 enum addr_type_t type = UNICAST_ADDR;
5199
5200 return inet6_dump_addr(skb, cb, type);
5201 }
5202
5203 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5204 {
5205 enum addr_type_t type = MULTICAST_ADDR;
5206
5207 return inet6_dump_addr(skb, cb, type);
5208 }
5209
5210
5211 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5212 {
5213 enum addr_type_t type = ANYCAST_ADDR;
5214
5215 return inet6_dump_addr(skb, cb, type);
5216 }
5217
5218 static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5219 const struct nlmsghdr *nlh,
5220 struct nlattr **tb,
5221 struct netlink_ext_ack *extack)
5222 {
5223 struct ifaddrmsg *ifm;
5224 int i, err;
5225
5226 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5227 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5228 return -EINVAL;
5229 }
5230
5231 ifm = nlmsg_data(nlh);
5232 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5233 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5234 return -EINVAL;
5235 }
5236
5237 if (!netlink_strict_get_check(skb))
5238 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5239 ifa_ipv6_policy, extack);
5240
5241 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5242 ifa_ipv6_policy, extack);
5243 if (err)
5244 return err;
5245
5246 for (i = 0; i <= IFA_MAX; i++) {
5247 if (!tb[i])
5248 continue;
5249
5250 switch (i) {
5251 case IFA_TARGET_NETNSID:
5252 case IFA_ADDRESS:
5253 case IFA_LOCAL:
5254 break;
5255 default:
5256 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5257 return -EINVAL;
5258 }
5259 }
5260
5261 return 0;
5262 }
5263
5264 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5265 struct netlink_ext_ack *extack)
5266 {
5267 struct net *net = sock_net(in_skb->sk);
5268 struct inet6_fill_args fillargs = {
5269 .portid = NETLINK_CB(in_skb).portid,
5270 .seq = nlh->nlmsg_seq,
5271 .event = RTM_NEWADDR,
5272 .flags = 0,
5273 .netnsid = -1,
5274 };
5275 struct net *tgt_net = net;
5276 struct ifaddrmsg *ifm;
5277 struct nlattr *tb[IFA_MAX+1];
5278 struct in6_addr *addr = NULL, *peer;
5279 struct net_device *dev = NULL;
5280 struct inet6_ifaddr *ifa;
5281 struct sk_buff *skb;
5282 int err;
5283
5284 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5285 if (err < 0)
5286 return err;
5287
5288 if (tb[IFA_TARGET_NETNSID]) {
5289 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5290
5291 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5292 fillargs.netnsid);
5293 if (IS_ERR(tgt_net))
5294 return PTR_ERR(tgt_net);
5295 }
5296
5297 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5298 if (!addr)
5299 return -EINVAL;
5300
5301 ifm = nlmsg_data(nlh);
5302 if (ifm->ifa_index)
5303 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5304
5305 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5306 if (!ifa) {
5307 err = -EADDRNOTAVAIL;
5308 goto errout;
5309 }
5310
5311 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5312 if (!skb) {
5313 err = -ENOBUFS;
5314 goto errout_ifa;
5315 }
5316
5317 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5318 if (err < 0) {
5319 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5320 WARN_ON(err == -EMSGSIZE);
5321 kfree_skb(skb);
5322 goto errout_ifa;
5323 }
5324 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5325 errout_ifa:
5326 in6_ifa_put(ifa);
5327 errout:
5328 if (dev)
5329 dev_put(dev);
5330 if (fillargs.netnsid >= 0)
5331 put_net(tgt_net);
5332
5333 return err;
5334 }
5335
5336 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5337 {
5338 struct sk_buff *skb;
5339 struct net *net = dev_net(ifa->idev->dev);
5340 struct inet6_fill_args fillargs = {
5341 .portid = 0,
5342 .seq = 0,
5343 .event = event,
5344 .flags = 0,
5345 .netnsid = -1,
5346 };
5347 int err = -ENOBUFS;
5348
5349 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5350 if (!skb)
5351 goto errout;
5352
5353 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5354 if (err < 0) {
5355 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
5356 WARN_ON(err == -EMSGSIZE);
5357 kfree_skb(skb);
5358 goto errout;
5359 }
5360 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5361 return;
5362 errout:
5363 if (err < 0)
5364 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5365 }
5366
5367 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5368 __s32 *array, int bytes)
5369 {
5370 BUG_ON(bytes < (DEVCONF_MAX * 4));
5371
5372 memset(array, 0, bytes);
5373 array[DEVCONF_FORWARDING] = cnf->forwarding;
5374 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5375 array[DEVCONF_MTU6] = cnf->mtu6;
5376 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5377 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5378 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5379 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5380 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5381 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5382 jiffies_to_msecs(cnf->rtr_solicit_interval);
5383 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5384 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5385 array[DEVCONF_RTR_SOLICIT_DELAY] =
5386 jiffies_to_msecs(cnf->rtr_solicit_delay);
5387 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5388 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5389 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5390 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5391 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5392 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5393 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5394 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5395 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5396 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5397 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5398 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5399 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5400 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5401 #ifdef CONFIG_IPV6_ROUTER_PREF
5402 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5403 array[DEVCONF_RTR_PROBE_INTERVAL] =
5404 jiffies_to_msecs(cnf->rtr_probe_interval);
5405 #ifdef CONFIG_IPV6_ROUTE_INFO
5406 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5407 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5408 #endif
5409 #endif
5410 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5411 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5412 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5413 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5414 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5415 #endif
5416 #ifdef CONFIG_IPV6_MROUTE
5417 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5418 #endif
5419 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5420 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5421 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5422 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5423 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5424 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5425 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5426 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5427 /* we omit DEVCONF_STABLE_SECRET for now */
5428 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5429 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5430 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5431 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5432 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5433 #ifdef CONFIG_IPV6_SEG6_HMAC
5434 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5435 #endif
5436 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5437 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5438 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5439 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5440 }
5441
5442 static inline size_t inet6_ifla6_size(void)
5443 {
5444 return nla_total_size(4) /* IFLA_INET6_FLAGS */
5445 + nla_total_size(sizeof(struct ifla_cacheinfo))
5446 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
5447 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
5448 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
5449 + nla_total_size(sizeof(struct in6_addr)) /* IFLA_INET6_TOKEN */
5450 + nla_total_size(1) /* IFLA_INET6_ADDR_GEN_MODE */
5451 + 0;
5452 }
5453
5454 static inline size_t inet6_if_nlmsg_size(void)
5455 {
5456 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5457 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
5458 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
5459 + nla_total_size(4) /* IFLA_MTU */
5460 + nla_total_size(4) /* IFLA_LINK */
5461 + nla_total_size(1) /* IFLA_OPERSTATE */
5462 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
5463 }
5464
5465 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5466 int bytes)
5467 {
5468 int i;
5469 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5470 BUG_ON(pad < 0);
5471
5472 /* Use put_unaligned() because stats may not be aligned for u64. */
5473 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5474 for (i = 1; i < ICMP6_MIB_MAX; i++)
5475 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5476
5477 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5478 }
5479
5480 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5481 int bytes, size_t syncpoff)
5482 {
5483 int i, c;
5484 u64 buff[IPSTATS_MIB_MAX];
5485 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5486
5487 BUG_ON(pad < 0);
5488
5489 memset(buff, 0, sizeof(buff));
5490 buff[0] = IPSTATS_MIB_MAX;
5491
5492 for_each_possible_cpu(c) {
5493 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5494 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5495 }
5496
5497 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5498 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5499 }
5500
5501 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5502 int bytes)
5503 {
5504 switch (attrtype) {
5505 case IFLA_INET6_STATS:
5506 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5507 offsetof(struct ipstats_mib, syncp));
5508 break;
5509 case IFLA_INET6_ICMP6STATS:
5510 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5511 break;
5512 }
5513 }
5514
5515 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5516 u32 ext_filter_mask)
5517 {
5518 struct nlattr *nla;
5519 struct ifla_cacheinfo ci;
5520
5521 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5522 goto nla_put_failure;
5523 ci.max_reasm_len = IPV6_MAXPLEN;
5524 ci.tstamp = cstamp_delta(idev->tstamp);
5525 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5526 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5527 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5528 goto nla_put_failure;
5529 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5530 if (!nla)
5531 goto nla_put_failure;
5532 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5533
5534 /* XXX - MC not implemented */
5535
5536 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5537 return 0;
5538
5539 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5540 if (!nla)
5541 goto nla_put_failure;
5542 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5543
5544 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5545 if (!nla)
5546 goto nla_put_failure;
5547 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5548
5549 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5550 if (!nla)
5551 goto nla_put_failure;
5552
5553 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5554 goto nla_put_failure;
5555
5556 read_lock_bh(&idev->lock);
5557 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5558 read_unlock_bh(&idev->lock);
5559
5560 return 0;
5561
5562 nla_put_failure:
5563 return -EMSGSIZE;
5564 }
5565
5566 static size_t inet6_get_link_af_size(const struct net_device *dev,
5567 u32 ext_filter_mask)
5568 {
5569 if (!__in6_dev_get(dev))
5570 return 0;
5571
5572 return inet6_ifla6_size();
5573 }
5574
5575 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5576 u32 ext_filter_mask)
5577 {
5578 struct inet6_dev *idev = __in6_dev_get(dev);
5579
5580 if (!idev)
5581 return -ENODATA;
5582
5583 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5584 return -EMSGSIZE;
5585
5586 return 0;
5587 }
5588
5589 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5590 {
5591 struct inet6_ifaddr *ifp;
5592 struct net_device *dev = idev->dev;
5593 bool clear_token, update_rs = false;
5594 struct in6_addr ll_addr;
5595
5596 ASSERT_RTNL();
5597
5598 if (!token)
5599 return -EINVAL;
5600 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5601 return -EINVAL;
5602 if (!ipv6_accept_ra(idev))
5603 return -EINVAL;
5604 if (idev->cnf.rtr_solicits == 0)
5605 return -EINVAL;
5606
5607 write_lock_bh(&idev->lock);
5608
5609 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5610 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5611
5612 write_unlock_bh(&idev->lock);
5613
5614 clear_token = ipv6_addr_any(token);
5615 if (clear_token)
5616 goto update_lft;
5617
5618 if (!idev->dead && (idev->if_flags & IF_READY) &&
5619 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5620 IFA_F_OPTIMISTIC)) {
5621 /* If we're not ready, then normal ifup will take care
5622 * of this. Otherwise, we need to request our rs here.
5623 */
5624 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5625 update_rs = true;
5626 }
5627
5628 update_lft:
5629 write_lock_bh(&idev->lock);
5630
5631 if (update_rs) {
5632 idev->if_flags |= IF_RS_SENT;
5633 idev->rs_interval = rfc3315_s14_backoff_init(
5634 idev->cnf.rtr_solicit_interval);
5635 idev->rs_probes = 1;
5636 addrconf_mod_rs_timer(idev, idev->rs_interval);
5637 }
5638
5639 /* Well, that's kinda nasty ... */
5640 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5641 spin_lock(&ifp->lock);
5642 if (ifp->tokenized) {
5643 ifp->valid_lft = 0;
5644 ifp->prefered_lft = 0;
5645 }
5646 spin_unlock(&ifp->lock);
5647 }
5648
5649 write_unlock_bh(&idev->lock);
5650 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5651 addrconf_verify_rtnl();
5652 return 0;
5653 }
5654
5655 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5656 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5657 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5658 };
5659
5660 static int check_addr_gen_mode(int mode)
5661 {
5662 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5663 mode != IN6_ADDR_GEN_MODE_NONE &&
5664 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5665 mode != IN6_ADDR_GEN_MODE_RANDOM)
5666 return -EINVAL;
5667 return 1;
5668 }
5669
5670 static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5671 int mode)
5672 {
5673 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5674 !idev->cnf.stable_secret.initialized &&
5675 !net->ipv6.devconf_dflt->stable_secret.initialized)
5676 return -EINVAL;
5677 return 1;
5678 }
5679
5680 static int inet6_validate_link_af(const struct net_device *dev,
5681 const struct nlattr *nla)
5682 {
5683 struct nlattr *tb[IFLA_INET6_MAX + 1];
5684 struct inet6_dev *idev = NULL;
5685 int err;
5686
5687 if (dev) {
5688 idev = __in6_dev_get(dev);
5689 if (!idev)
5690 return -EAFNOSUPPORT;
5691 }
5692
5693 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5694 inet6_af_policy, NULL);
5695 if (err)
5696 return err;
5697
5698 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5699 return -EINVAL;
5700
5701 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5702 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5703
5704 if (check_addr_gen_mode(mode) < 0)
5705 return -EINVAL;
5706 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5707 return -EINVAL;
5708 }
5709
5710 return 0;
5711 }
5712
5713 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5714 {
5715 struct inet6_dev *idev = __in6_dev_get(dev);
5716 struct nlattr *tb[IFLA_INET6_MAX + 1];
5717 int err;
5718
5719 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5720 BUG();
5721
5722 if (tb[IFLA_INET6_TOKEN]) {
5723 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5724 if (err)
5725 return err;
5726 }
5727
5728 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5729 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5730
5731 idev->cnf.addr_gen_mode = mode;
5732 }
5733
5734 return 0;
5735 }
5736
5737 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5738 u32 portid, u32 seq, int event, unsigned int flags)
5739 {
5740 struct net_device *dev = idev->dev;
5741 struct ifinfomsg *hdr;
5742 struct nlmsghdr *nlh;
5743 void *protoinfo;
5744
5745 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5746 if (!nlh)
5747 return -EMSGSIZE;
5748
5749 hdr = nlmsg_data(nlh);
5750 hdr->ifi_family = AF_INET6;
5751 hdr->__ifi_pad = 0;
5752 hdr->ifi_type = dev->type;
5753 hdr->ifi_index = dev->ifindex;
5754 hdr->ifi_flags = dev_get_flags(dev);
5755 hdr->ifi_change = 0;
5756
5757 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5758 (dev->addr_len &&
5759 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5760 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5761 (dev->ifindex != dev_get_iflink(dev) &&
5762 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5763 nla_put_u8(skb, IFLA_OPERSTATE,
5764 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5765 goto nla_put_failure;
5766 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5767 if (!protoinfo)
5768 goto nla_put_failure;
5769
5770 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5771 goto nla_put_failure;
5772
5773 nla_nest_end(skb, protoinfo);
5774 nlmsg_end(skb, nlh);
5775 return 0;
5776
5777 nla_put_failure:
5778 nlmsg_cancel(skb, nlh);
5779 return -EMSGSIZE;
5780 }
5781
5782 static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5783 struct netlink_ext_ack *extack)
5784 {
5785 struct ifinfomsg *ifm;
5786
5787 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5788 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5789 return -EINVAL;
5790 }
5791
5792 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5793 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5794 return -EINVAL;
5795 }
5796
5797 ifm = nlmsg_data(nlh);
5798 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5799 ifm->ifi_change || ifm->ifi_index) {
5800 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5801 return -EINVAL;
5802 }
5803
5804 return 0;
5805 }
5806
5807 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5808 {
5809 struct net *net = sock_net(skb->sk);
5810 int h, s_h;
5811 int idx = 0, s_idx;
5812 struct net_device *dev;
5813 struct inet6_dev *idev;
5814 struct hlist_head *head;
5815
5816 /* only requests using strict checking can pass data to
5817 * influence the dump
5818 */
5819 if (cb->strict_check) {
5820 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5821
5822 if (err < 0)
5823 return err;
5824 }
5825
5826 s_h = cb->args[0];
5827 s_idx = cb->args[1];
5828
5829 rcu_read_lock();
5830 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5831 idx = 0;
5832 head = &net->dev_index_head[h];
5833 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5834 if (idx < s_idx)
5835 goto cont;
5836 idev = __in6_dev_get(dev);
5837 if (!idev)
5838 goto cont;
5839 if (inet6_fill_ifinfo(skb, idev,
5840 NETLINK_CB(cb->skb).portid,
5841 cb->nlh->nlmsg_seq,
5842 RTM_NEWLINK, NLM_F_MULTI) < 0)
5843 goto out;
5844 cont:
5845 idx++;
5846 }
5847 }
5848 out:
5849 rcu_read_unlock();
5850 cb->args[1] = idx;
5851 cb->args[0] = h;
5852
5853 return skb->len;
5854 }
5855
5856 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5857 {
5858 struct sk_buff *skb;
5859 struct net *net = dev_net(idev->dev);
5860 int err = -ENOBUFS;
5861
5862 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5863 if (!skb)
5864 goto errout;
5865
5866 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5867 if (err < 0) {
5868 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5869 WARN_ON(err == -EMSGSIZE);
5870 kfree_skb(skb);
5871 goto errout;
5872 }
5873 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5874 return;
5875 errout:
5876 if (err < 0)
5877 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5878 }
5879
5880 static inline size_t inet6_prefix_nlmsg_size(void)
5881 {
5882 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5883 + nla_total_size(sizeof(struct in6_addr))
5884 + nla_total_size(sizeof(struct prefix_cacheinfo));
5885 }
5886
5887 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5888 struct prefix_info *pinfo, u32 portid, u32 seq,
5889 int event, unsigned int flags)
5890 {
5891 struct prefixmsg *pmsg;
5892 struct nlmsghdr *nlh;
5893 struct prefix_cacheinfo ci;
5894
5895 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5896 if (!nlh)
5897 return -EMSGSIZE;
5898
5899 pmsg = nlmsg_data(nlh);
5900 pmsg->prefix_family = AF_INET6;
5901 pmsg->prefix_pad1 = 0;
5902 pmsg->prefix_pad2 = 0;
5903 pmsg->prefix_ifindex = idev->dev->ifindex;
5904 pmsg->prefix_len = pinfo->prefix_len;
5905 pmsg->prefix_type = pinfo->type;
5906 pmsg->prefix_pad3 = 0;
5907 pmsg->prefix_flags = 0;
5908 if (pinfo->onlink)
5909 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5910 if (pinfo->autoconf)
5911 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5912
5913 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5914 goto nla_put_failure;
5915 ci.preferred_time = ntohl(pinfo->prefered);
5916 ci.valid_time = ntohl(pinfo->valid);
5917 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5918 goto nla_put_failure;
5919 nlmsg_end(skb, nlh);
5920 return 0;
5921
5922 nla_put_failure:
5923 nlmsg_cancel(skb, nlh);
5924 return -EMSGSIZE;
5925 }
5926
5927 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5928 struct prefix_info *pinfo)
5929 {
5930 struct sk_buff *skb;
5931 struct net *net = dev_net(idev->dev);
5932 int err = -ENOBUFS;
5933
5934 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5935 if (!skb)
5936 goto errout;
5937
5938 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5939 if (err < 0) {
5940 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5941 WARN_ON(err == -EMSGSIZE);
5942 kfree_skb(skb);
5943 goto errout;
5944 }
5945 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5946 return;
5947 errout:
5948 if (err < 0)
5949 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5950 }
5951
5952 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5953 {
5954 struct net *net = dev_net(ifp->idev->dev);
5955
5956 if (event)
5957 ASSERT_RTNL();
5958
5959 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5960
5961 switch (event) {
5962 case RTM_NEWADDR:
5963 /*
5964 * If the address was optimistic
5965 * we inserted the route at the start of
5966 * our DAD process, so we don't need
5967 * to do it again
5968 */
5969 if (!rcu_access_pointer(ifp->rt->fib6_node))
5970 ip6_ins_rt(net, ifp->rt);
5971 if (ifp->idev->cnf.forwarding)
5972 addrconf_join_anycast(ifp);
5973 if (!ipv6_addr_any(&ifp->peer_addr))
5974 addrconf_prefix_route(&ifp->peer_addr, 128, 0,
5975 ifp->idev->dev, 0, 0,
5976 GFP_ATOMIC);
5977 break;
5978 case RTM_DELADDR:
5979 if (ifp->idev->cnf.forwarding)
5980 addrconf_leave_anycast(ifp);
5981 addrconf_leave_solict(ifp->idev, &ifp->addr);
5982 if (!ipv6_addr_any(&ifp->peer_addr)) {
5983 struct fib6_info *rt;
5984
5985 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5986 ifp->idev->dev, 0, 0,
5987 false);
5988 if (rt)
5989 ip6_del_rt(net, rt);
5990 }
5991 if (ifp->rt) {
5992 ip6_del_rt(net, ifp->rt);
5993 ifp->rt = NULL;
5994 }
5995 rt_genid_bump_ipv6(net);
5996 break;
5997 }
5998 atomic_inc(&net->ipv6.dev_addr_genid);
5999 }
6000
6001 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6002 {
6003 rcu_read_lock_bh();
6004 if (likely(ifp->idev->dead == 0))
6005 __ipv6_ifa_notify(event, ifp);
6006 rcu_read_unlock_bh();
6007 }
6008
6009 #ifdef CONFIG_SYSCTL
6010
6011 static
6012 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6013 void __user *buffer, size_t *lenp, loff_t *ppos)
6014 {
6015 int *valp = ctl->data;
6016 int val = *valp;
6017 loff_t pos = *ppos;
6018 struct ctl_table lctl;
6019 int ret;
6020
6021 /*
6022 * ctl->data points to idev->cnf.forwarding, we should
6023 * not modify it until we get the rtnl lock.
6024 */
6025 lctl = *ctl;
6026 lctl.data = &val;
6027
6028 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6029
6030 if (write)
6031 ret = addrconf_fixup_forwarding(ctl, valp, val);
6032 if (ret)
6033 *ppos = pos;
6034 return ret;
6035 }
6036
6037 static
6038 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6039 void __user *buffer, size_t *lenp, loff_t *ppos)
6040 {
6041 struct inet6_dev *idev = ctl->extra1;
6042 int min_mtu = IPV6_MIN_MTU;
6043 struct ctl_table lctl;
6044
6045 lctl = *ctl;
6046 lctl.extra1 = &min_mtu;
6047 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6048
6049 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6050 }
6051
6052 static void dev_disable_change(struct inet6_dev *idev)
6053 {
6054 struct netdev_notifier_info info;
6055
6056 if (!idev || !idev->dev)
6057 return;
6058
6059 netdev_notifier_info_init(&info, idev->dev);
6060 if (idev->cnf.disable_ipv6)
6061 addrconf_notify(NULL, NETDEV_DOWN, &info);
6062 else
6063 addrconf_notify(NULL, NETDEV_UP, &info);
6064 }
6065
6066 static void addrconf_disable_change(struct net *net, __s32 newf)
6067 {
6068 struct net_device *dev;
6069 struct inet6_dev *idev;
6070
6071 for_each_netdev(net, dev) {
6072 idev = __in6_dev_get(dev);
6073 if (idev) {
6074 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6075 idev->cnf.disable_ipv6 = newf;
6076 if (changed)
6077 dev_disable_change(idev);
6078 }
6079 }
6080 }
6081
6082 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6083 {
6084 struct net *net;
6085 int old;
6086
6087 if (!rtnl_trylock())
6088 return restart_syscall();
6089
6090 net = (struct net *)table->extra2;
6091 old = *p;
6092 *p = newf;
6093
6094 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6095 rtnl_unlock();
6096 return 0;
6097 }
6098
6099 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6100 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6101 addrconf_disable_change(net, newf);
6102 } else if ((!newf) ^ (!old))
6103 dev_disable_change((struct inet6_dev *)table->extra1);
6104
6105 rtnl_unlock();
6106 return 0;
6107 }
6108
6109 static
6110 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6111 void __user *buffer, size_t *lenp, loff_t *ppos)
6112 {
6113 int *valp = ctl->data;
6114 int val = *valp;
6115 loff_t pos = *ppos;
6116 struct ctl_table lctl;
6117 int ret;
6118
6119 /*
6120 * ctl->data points to idev->cnf.disable_ipv6, we should
6121 * not modify it until we get the rtnl lock.
6122 */
6123 lctl = *ctl;
6124 lctl.data = &val;
6125
6126 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6127
6128 if (write)
6129 ret = addrconf_disable_ipv6(ctl, valp, val);
6130 if (ret)
6131 *ppos = pos;
6132 return ret;
6133 }
6134
6135 static
6136 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6137 void __user *buffer, size_t *lenp, loff_t *ppos)
6138 {
6139 int *valp = ctl->data;
6140 int ret;
6141 int old, new;
6142
6143 old = *valp;
6144 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6145 new = *valp;
6146
6147 if (write && old != new) {
6148 struct net *net = ctl->extra2;
6149
6150 if (!rtnl_trylock())
6151 return restart_syscall();
6152
6153 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6154 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6155 NETCONFA_PROXY_NEIGH,
6156 NETCONFA_IFINDEX_DEFAULT,
6157 net->ipv6.devconf_dflt);
6158 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6159 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6160 NETCONFA_PROXY_NEIGH,
6161 NETCONFA_IFINDEX_ALL,
6162 net->ipv6.devconf_all);
6163 else {
6164 struct inet6_dev *idev = ctl->extra1;
6165
6166 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6167 NETCONFA_PROXY_NEIGH,
6168 idev->dev->ifindex,
6169 &idev->cnf);
6170 }
6171 rtnl_unlock();
6172 }
6173
6174 return ret;
6175 }
6176
6177 static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6178 void __user *buffer, size_t *lenp,
6179 loff_t *ppos)
6180 {
6181 int ret = 0;
6182 u32 new_val;
6183 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6184 struct net *net = (struct net *)ctl->extra2;
6185 struct ctl_table tmp = {
6186 .data = &new_val,
6187 .maxlen = sizeof(new_val),
6188 .mode = ctl->mode,
6189 };
6190
6191 if (!rtnl_trylock())
6192 return restart_syscall();
6193
6194 new_val = *((u32 *)ctl->data);
6195
6196 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6197 if (ret != 0)
6198 goto out;
6199
6200 if (write) {
6201 if (check_addr_gen_mode(new_val) < 0) {
6202 ret = -EINVAL;
6203 goto out;
6204 }
6205
6206 if (idev) {
6207 if (check_stable_privacy(idev, net, new_val) < 0) {
6208 ret = -EINVAL;
6209 goto out;
6210 }
6211
6212 if (idev->cnf.addr_gen_mode != new_val) {
6213 idev->cnf.addr_gen_mode = new_val;
6214 addrconf_dev_config(idev->dev);
6215 }
6216 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6217 struct net_device *dev;
6218
6219 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6220 for_each_netdev(net, dev) {
6221 idev = __in6_dev_get(dev);
6222 if (idev &&
6223 idev->cnf.addr_gen_mode != new_val) {
6224 idev->cnf.addr_gen_mode = new_val;
6225 addrconf_dev_config(idev->dev);
6226 }
6227 }
6228 }
6229
6230 *((u32 *)ctl->data) = new_val;
6231 }
6232
6233 out:
6234 rtnl_unlock();
6235
6236 return ret;
6237 }
6238
6239 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6240 void __user *buffer, size_t *lenp,
6241 loff_t *ppos)
6242 {
6243 int err;
6244 struct in6_addr addr;
6245 char str[IPV6_MAX_STRLEN];
6246 struct ctl_table lctl = *ctl;
6247 struct net *net = ctl->extra2;
6248 struct ipv6_stable_secret *secret = ctl->data;
6249
6250 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6251 return -EIO;
6252
6253 lctl.maxlen = IPV6_MAX_STRLEN;
6254 lctl.data = str;
6255
6256 if (!rtnl_trylock())
6257 return restart_syscall();
6258
6259 if (!write && !secret->initialized) {
6260 err = -EIO;
6261 goto out;
6262 }
6263
6264 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6265 if (err >= sizeof(str)) {
6266 err = -EIO;
6267 goto out;
6268 }
6269
6270 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6271 if (err || !write)
6272 goto out;
6273
6274 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6275 err = -EIO;
6276 goto out;
6277 }
6278
6279 secret->initialized = true;
6280 secret->secret = addr;
6281
6282 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6283 struct net_device *dev;
6284
6285 for_each_netdev(net, dev) {
6286 struct inet6_dev *idev = __in6_dev_get(dev);
6287
6288 if (idev) {
6289 idev->cnf.addr_gen_mode =
6290 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6291 }
6292 }
6293 } else {
6294 struct inet6_dev *idev = ctl->extra1;
6295
6296 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6297 }
6298
6299 out:
6300 rtnl_unlock();
6301
6302 return err;
6303 }
6304
6305 static
6306 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6307 int write,
6308 void __user *buffer,
6309 size_t *lenp,
6310 loff_t *ppos)
6311 {
6312 int *valp = ctl->data;
6313 int val = *valp;
6314 loff_t pos = *ppos;
6315 struct ctl_table lctl;
6316 int ret;
6317
6318 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
6319 * we should not modify it until we get the rtnl lock.
6320 */
6321 lctl = *ctl;
6322 lctl.data = &val;
6323
6324 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6325
6326 if (write)
6327 ret = addrconf_fixup_linkdown(ctl, valp, val);
6328 if (ret)
6329 *ppos = pos;
6330 return ret;
6331 }
6332
6333 static
6334 void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6335 {
6336 if (rt) {
6337 if (action)
6338 rt->dst.flags |= DST_NOPOLICY;
6339 else
6340 rt->dst.flags &= ~DST_NOPOLICY;
6341 }
6342 }
6343
6344 static
6345 void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6346 {
6347 struct inet6_ifaddr *ifa;
6348
6349 read_lock_bh(&idev->lock);
6350 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6351 spin_lock(&ifa->lock);
6352 if (ifa->rt) {
6353 struct fib6_info *rt = ifa->rt;
6354 int cpu;
6355
6356 rcu_read_lock();
6357 ifa->rt->dst_nopolicy = val ? true : false;
6358 if (rt->rt6i_pcpu) {
6359 for_each_possible_cpu(cpu) {
6360 struct rt6_info **rtp;
6361
6362 rtp = per_cpu_ptr(rt->rt6i_pcpu, cpu);
6363 addrconf_set_nopolicy(*rtp, val);
6364 }
6365 }
6366 rcu_read_unlock();
6367 }
6368 spin_unlock(&ifa->lock);
6369 }
6370 read_unlock_bh(&idev->lock);
6371 }
6372
6373 static
6374 int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6375 {
6376 struct inet6_dev *idev;
6377 struct net *net;
6378
6379 if (!rtnl_trylock())
6380 return restart_syscall();
6381
6382 *valp = val;
6383
6384 net = (struct net *)ctl->extra2;
6385 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6386 rtnl_unlock();
6387 return 0;
6388 }
6389
6390 if (valp == &net->ipv6.devconf_all->disable_policy) {
6391 struct net_device *dev;
6392
6393 for_each_netdev(net, dev) {
6394 idev = __in6_dev_get(dev);
6395 if (idev)
6396 addrconf_disable_policy_idev(idev, val);
6397 }
6398 } else {
6399 idev = (struct inet6_dev *)ctl->extra1;
6400 addrconf_disable_policy_idev(idev, val);
6401 }
6402
6403 rtnl_unlock();
6404 return 0;
6405 }
6406
6407 static
6408 int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6409 void __user *buffer, size_t *lenp,
6410 loff_t *ppos)
6411 {
6412 int *valp = ctl->data;
6413 int val = *valp;
6414 loff_t pos = *ppos;
6415 struct ctl_table lctl;
6416 int ret;
6417
6418 lctl = *ctl;
6419 lctl.data = &val;
6420 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6421
6422 if (write && (*valp != val))
6423 ret = addrconf_disable_policy(ctl, valp, val);
6424
6425 if (ret)
6426 *ppos = pos;
6427
6428 return ret;
6429 }
6430
6431 static int minus_one = -1;
6432 static const int zero = 0;
6433 static const int one = 1;
6434 static const int two_five_five = 255;
6435
6436 static const struct ctl_table addrconf_sysctl[] = {
6437 {
6438 .procname = "forwarding",
6439 .data = &ipv6_devconf.forwarding,
6440 .maxlen = sizeof(int),
6441 .mode = 0644,
6442 .proc_handler = addrconf_sysctl_forward,
6443 },
6444 {
6445 .procname = "hop_limit",
6446 .data = &ipv6_devconf.hop_limit,
6447 .maxlen = sizeof(int),
6448 .mode = 0644,
6449 .proc_handler = proc_dointvec_minmax,
6450 .extra1 = (void *)&one,
6451 .extra2 = (void *)&two_five_five,
6452 },
6453 {
6454 .procname = "mtu",
6455 .data = &ipv6_devconf.mtu6,
6456 .maxlen = sizeof(int),
6457 .mode = 0644,
6458 .proc_handler = addrconf_sysctl_mtu,
6459 },
6460 {
6461 .procname = "accept_ra",
6462 .data = &ipv6_devconf.accept_ra,
6463 .maxlen = sizeof(int),
6464 .mode = 0644,
6465 .proc_handler = proc_dointvec,
6466 },
6467 {
6468 .procname = "accept_redirects",
6469 .data = &ipv6_devconf.accept_redirects,
6470 .maxlen = sizeof(int),
6471 .mode = 0644,
6472 .proc_handler = proc_dointvec,
6473 },
6474 {
6475 .procname = "autoconf",
6476 .data = &ipv6_devconf.autoconf,
6477 .maxlen = sizeof(int),
6478 .mode = 0644,
6479 .proc_handler = proc_dointvec,
6480 },
6481 {
6482 .procname = "dad_transmits",
6483 .data = &ipv6_devconf.dad_transmits,
6484 .maxlen = sizeof(int),
6485 .mode = 0644,
6486 .proc_handler = proc_dointvec,
6487 },
6488 {
6489 .procname = "router_solicitations",
6490 .data = &ipv6_devconf.rtr_solicits,
6491 .maxlen = sizeof(int),
6492 .mode = 0644,
6493 .proc_handler = proc_dointvec_minmax,
6494 .extra1 = &minus_one,
6495 },
6496 {
6497 .procname = "router_solicitation_interval",
6498 .data = &ipv6_devconf.rtr_solicit_interval,
6499 .maxlen = sizeof(int),
6500 .mode = 0644,
6501 .proc_handler = proc_dointvec_jiffies,
6502 },
6503 {
6504 .procname = "router_solicitation_max_interval",
6505 .data = &ipv6_devconf.rtr_solicit_max_interval,
6506 .maxlen = sizeof(int),
6507 .mode = 0644,
6508 .proc_handler = proc_dointvec_jiffies,
6509 },
6510 {
6511 .procname = "router_solicitation_delay",
6512 .data = &ipv6_devconf.rtr_solicit_delay,
6513 .maxlen = sizeof(int),
6514 .mode = 0644,
6515 .proc_handler = proc_dointvec_jiffies,
6516 },
6517 {
6518 .procname = "force_mld_version",
6519 .data = &ipv6_devconf.force_mld_version,
6520 .maxlen = sizeof(int),
6521 .mode = 0644,
6522 .proc_handler = proc_dointvec,
6523 },
6524 {
6525 .procname = "mldv1_unsolicited_report_interval",
6526 .data =
6527 &ipv6_devconf.mldv1_unsolicited_report_interval,
6528 .maxlen = sizeof(int),
6529 .mode = 0644,
6530 .proc_handler = proc_dointvec_ms_jiffies,
6531 },
6532 {
6533 .procname = "mldv2_unsolicited_report_interval",
6534 .data =
6535 &ipv6_devconf.mldv2_unsolicited_report_interval,
6536 .maxlen = sizeof(int),
6537 .mode = 0644,
6538 .proc_handler = proc_dointvec_ms_jiffies,
6539 },
6540 {
6541 .procname = "use_tempaddr",
6542 .data = &ipv6_devconf.use_tempaddr,
6543 .maxlen = sizeof(int),
6544 .mode = 0644,
6545 .proc_handler = proc_dointvec,
6546 },
6547 {
6548 .procname = "temp_valid_lft",
6549 .data = &ipv6_devconf.temp_valid_lft,
6550 .maxlen = sizeof(int),
6551 .mode = 0644,
6552 .proc_handler = proc_dointvec,
6553 },
6554 {
6555 .procname = "temp_prefered_lft",
6556 .data = &ipv6_devconf.temp_prefered_lft,
6557 .maxlen = sizeof(int),
6558 .mode = 0644,
6559 .proc_handler = proc_dointvec,
6560 },
6561 {
6562 .procname = "regen_max_retry",
6563 .data = &ipv6_devconf.regen_max_retry,
6564 .maxlen = sizeof(int),
6565 .mode = 0644,
6566 .proc_handler = proc_dointvec,
6567 },
6568 {
6569 .procname = "max_desync_factor",
6570 .data = &ipv6_devconf.max_desync_factor,
6571 .maxlen = sizeof(int),
6572 .mode = 0644,
6573 .proc_handler = proc_dointvec,
6574 },
6575 {
6576 .procname = "max_addresses",
6577 .data = &ipv6_devconf.max_addresses,
6578 .maxlen = sizeof(int),
6579 .mode = 0644,
6580 .proc_handler = proc_dointvec,
6581 },
6582 {
6583 .procname = "accept_ra_defrtr",
6584 .data = &ipv6_devconf.accept_ra_defrtr,
6585 .maxlen = sizeof(int),
6586 .mode = 0644,
6587 .proc_handler = proc_dointvec,
6588 },
6589 {
6590 .procname = "accept_ra_min_hop_limit",
6591 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6592 .maxlen = sizeof(int),
6593 .mode = 0644,
6594 .proc_handler = proc_dointvec,
6595 },
6596 {
6597 .procname = "accept_ra_pinfo",
6598 .data = &ipv6_devconf.accept_ra_pinfo,
6599 .maxlen = sizeof(int),
6600 .mode = 0644,
6601 .proc_handler = proc_dointvec,
6602 },
6603 #ifdef CONFIG_IPV6_ROUTER_PREF
6604 {
6605 .procname = "accept_ra_rtr_pref",
6606 .data = &ipv6_devconf.accept_ra_rtr_pref,
6607 .maxlen = sizeof(int),
6608 .mode = 0644,
6609 .proc_handler = proc_dointvec,
6610 },
6611 {
6612 .procname = "router_probe_interval",
6613 .data = &ipv6_devconf.rtr_probe_interval,
6614 .maxlen = sizeof(int),
6615 .mode = 0644,
6616 .proc_handler = proc_dointvec_jiffies,
6617 },
6618 #ifdef CONFIG_IPV6_ROUTE_INFO
6619 {
6620 .procname = "accept_ra_rt_info_min_plen",
6621 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6622 .maxlen = sizeof(int),
6623 .mode = 0644,
6624 .proc_handler = proc_dointvec,
6625 },
6626 {
6627 .procname = "accept_ra_rt_info_max_plen",
6628 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6629 .maxlen = sizeof(int),
6630 .mode = 0644,
6631 .proc_handler = proc_dointvec,
6632 },
6633 #endif
6634 #endif
6635 {
6636 .procname = "proxy_ndp",
6637 .data = &ipv6_devconf.proxy_ndp,
6638 .maxlen = sizeof(int),
6639 .mode = 0644,
6640 .proc_handler = addrconf_sysctl_proxy_ndp,
6641 },
6642 {
6643 .procname = "accept_source_route",
6644 .data = &ipv6_devconf.accept_source_route,
6645 .maxlen = sizeof(int),
6646 .mode = 0644,
6647 .proc_handler = proc_dointvec,
6648 },
6649 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6650 {
6651 .procname = "optimistic_dad",
6652 .data = &ipv6_devconf.optimistic_dad,
6653 .maxlen = sizeof(int),
6654 .mode = 0644,
6655 .proc_handler = proc_dointvec,
6656 },
6657 {
6658 .procname = "use_optimistic",
6659 .data = &ipv6_devconf.use_optimistic,
6660 .maxlen = sizeof(int),
6661 .mode = 0644,
6662 .proc_handler = proc_dointvec,
6663 },
6664 #endif
6665 #ifdef CONFIG_IPV6_MROUTE
6666 {
6667 .procname = "mc_forwarding",
6668 .data = &ipv6_devconf.mc_forwarding,
6669 .maxlen = sizeof(int),
6670 .mode = 0444,
6671 .proc_handler = proc_dointvec,
6672 },
6673 #endif
6674 {
6675 .procname = "disable_ipv6",
6676 .data = &ipv6_devconf.disable_ipv6,
6677 .maxlen = sizeof(int),
6678 .mode = 0644,
6679 .proc_handler = addrconf_sysctl_disable,
6680 },
6681 {
6682 .procname = "accept_dad",
6683 .data = &ipv6_devconf.accept_dad,
6684 .maxlen = sizeof(int),
6685 .mode = 0644,
6686 .proc_handler = proc_dointvec,
6687 },
6688 {
6689 .procname = "force_tllao",
6690 .data = &ipv6_devconf.force_tllao,
6691 .maxlen = sizeof(int),
6692 .mode = 0644,
6693 .proc_handler = proc_dointvec
6694 },
6695 {
6696 .procname = "ndisc_notify",
6697 .data = &ipv6_devconf.ndisc_notify,
6698 .maxlen = sizeof(int),
6699 .mode = 0644,
6700 .proc_handler = proc_dointvec
6701 },
6702 {
6703 .procname = "suppress_frag_ndisc",
6704 .data = &ipv6_devconf.suppress_frag_ndisc,
6705 .maxlen = sizeof(int),
6706 .mode = 0644,
6707 .proc_handler = proc_dointvec
6708 },
6709 {
6710 .procname = "accept_ra_from_local",
6711 .data = &ipv6_devconf.accept_ra_from_local,
6712 .maxlen = sizeof(int),
6713 .mode = 0644,
6714 .proc_handler = proc_dointvec,
6715 },
6716 {
6717 .procname = "accept_ra_mtu",
6718 .data = &ipv6_devconf.accept_ra_mtu,
6719 .maxlen = sizeof(int),
6720 .mode = 0644,
6721 .proc_handler = proc_dointvec,
6722 },
6723 {
6724 .procname = "stable_secret",
6725 .data = &ipv6_devconf.stable_secret,
6726 .maxlen = IPV6_MAX_STRLEN,
6727 .mode = 0600,
6728 .proc_handler = addrconf_sysctl_stable_secret,
6729 },
6730 {
6731 .procname = "use_oif_addrs_only",
6732 .data = &ipv6_devconf.use_oif_addrs_only,
6733 .maxlen = sizeof(int),
6734 .mode = 0644,
6735 .proc_handler = proc_dointvec,
6736 },
6737 {
6738 .procname = "ignore_routes_with_linkdown",
6739 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6740 .maxlen = sizeof(int),
6741 .mode = 0644,
6742 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6743 },
6744 {
6745 .procname = "drop_unicast_in_l2_multicast",
6746 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6747 .maxlen = sizeof(int),
6748 .mode = 0644,
6749 .proc_handler = proc_dointvec,
6750 },
6751 {
6752 .procname = "drop_unsolicited_na",
6753 .data = &ipv6_devconf.drop_unsolicited_na,
6754 .maxlen = sizeof(int),
6755 .mode = 0644,
6756 .proc_handler = proc_dointvec,
6757 },
6758 {
6759 .procname = "keep_addr_on_down",
6760 .data = &ipv6_devconf.keep_addr_on_down,
6761 .maxlen = sizeof(int),
6762 .mode = 0644,
6763 .proc_handler = proc_dointvec,
6764
6765 },
6766 {
6767 .procname = "seg6_enabled",
6768 .data = &ipv6_devconf.seg6_enabled,
6769 .maxlen = sizeof(int),
6770 .mode = 0644,
6771 .proc_handler = proc_dointvec,
6772 },
6773 #ifdef CONFIG_IPV6_SEG6_HMAC
6774 {
6775 .procname = "seg6_require_hmac",
6776 .data = &ipv6_devconf.seg6_require_hmac,
6777 .maxlen = sizeof(int),
6778 .mode = 0644,
6779 .proc_handler = proc_dointvec,
6780 },
6781 #endif
6782 {
6783 .procname = "enhanced_dad",
6784 .data = &ipv6_devconf.enhanced_dad,
6785 .maxlen = sizeof(int),
6786 .mode = 0644,
6787 .proc_handler = proc_dointvec,
6788 },
6789 {
6790 .procname = "addr_gen_mode",
6791 .data = &ipv6_devconf.addr_gen_mode,
6792 .maxlen = sizeof(int),
6793 .mode = 0644,
6794 .proc_handler = addrconf_sysctl_addr_gen_mode,
6795 },
6796 {
6797 .procname = "disable_policy",
6798 .data = &ipv6_devconf.disable_policy,
6799 .maxlen = sizeof(int),
6800 .mode = 0644,
6801 .proc_handler = addrconf_sysctl_disable_policy,
6802 },
6803 {
6804 .procname = "ndisc_tclass",
6805 .data = &ipv6_devconf.ndisc_tclass,
6806 .maxlen = sizeof(int),
6807 .mode = 0644,
6808 .proc_handler = proc_dointvec_minmax,
6809 .extra1 = (void *)&zero,
6810 .extra2 = (void *)&two_five_five,
6811 },
6812 {
6813 /* sentinel */
6814 }
6815 };
6816
6817 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6818 struct inet6_dev *idev, struct ipv6_devconf *p)
6819 {
6820 int i, ifindex;
6821 struct ctl_table *table;
6822 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6823
6824 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6825 if (!table)
6826 goto out;
6827
6828 for (i = 0; table[i].data; i++) {
6829 table[i].data += (char *)p - (char *)&ipv6_devconf;
6830 /* If one of these is already set, then it is not safe to
6831 * overwrite either of them: this makes proc_dointvec_minmax
6832 * usable.
6833 */
6834 if (!table[i].extra1 && !table[i].extra2) {
6835 table[i].extra1 = idev; /* embedded; no ref */
6836 table[i].extra2 = net;
6837 }
6838 }
6839
6840 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6841
6842 p->sysctl_header = register_net_sysctl(net, path, table);
6843 if (!p->sysctl_header)
6844 goto free;
6845
6846 if (!strcmp(dev_name, "all"))
6847 ifindex = NETCONFA_IFINDEX_ALL;
6848 else if (!strcmp(dev_name, "default"))
6849 ifindex = NETCONFA_IFINDEX_DEFAULT;
6850 else
6851 ifindex = idev->dev->ifindex;
6852 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6853 ifindex, p);
6854 return 0;
6855
6856 free:
6857 kfree(table);
6858 out:
6859 return -ENOBUFS;
6860 }
6861
6862 static void __addrconf_sysctl_unregister(struct net *net,
6863 struct ipv6_devconf *p, int ifindex)
6864 {
6865 struct ctl_table *table;
6866
6867 if (!p->sysctl_header)
6868 return;
6869
6870 table = p->sysctl_header->ctl_table_arg;
6871 unregister_net_sysctl_table(p->sysctl_header);
6872 p->sysctl_header = NULL;
6873 kfree(table);
6874
6875 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6876 }
6877
6878 static int addrconf_sysctl_register(struct inet6_dev *idev)
6879 {
6880 int err;
6881
6882 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6883 return -EINVAL;
6884
6885 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6886 &ndisc_ifinfo_sysctl_change);
6887 if (err)
6888 return err;
6889 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6890 idev, &idev->cnf);
6891 if (err)
6892 neigh_sysctl_unregister(idev->nd_parms);
6893
6894 return err;
6895 }
6896
6897 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6898 {
6899 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6900 idev->dev->ifindex);
6901 neigh_sysctl_unregister(idev->nd_parms);
6902 }
6903
6904
6905 #endif
6906
6907 static int __net_init addrconf_init_net(struct net *net)
6908 {
6909 int err = -ENOMEM;
6910 struct ipv6_devconf *all, *dflt;
6911
6912 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6913 if (!all)
6914 goto err_alloc_all;
6915
6916 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6917 if (!dflt)
6918 goto err_alloc_dflt;
6919
6920 if (IS_ENABLED(CONFIG_SYSCTL) &&
6921 sysctl_devconf_inherit_init_net == 1 && !net_eq(net, &init_net)) {
6922 memcpy(all, init_net.ipv6.devconf_all, sizeof(ipv6_devconf));
6923 memcpy(dflt, init_net.ipv6.devconf_dflt, sizeof(ipv6_devconf_dflt));
6924 }
6925
6926 /* these will be inherited by all namespaces */
6927 dflt->autoconf = ipv6_defaults.autoconf;
6928 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
6929
6930 dflt->stable_secret.initialized = false;
6931 all->stable_secret.initialized = false;
6932
6933 net->ipv6.devconf_all = all;
6934 net->ipv6.devconf_dflt = dflt;
6935
6936 #ifdef CONFIG_SYSCTL
6937 err = __addrconf_sysctl_register(net, "all", NULL, all);
6938 if (err < 0)
6939 goto err_reg_all;
6940
6941 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
6942 if (err < 0)
6943 goto err_reg_dflt;
6944 #endif
6945 return 0;
6946
6947 #ifdef CONFIG_SYSCTL
6948 err_reg_dflt:
6949 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
6950 err_reg_all:
6951 kfree(dflt);
6952 #endif
6953 err_alloc_dflt:
6954 kfree(all);
6955 err_alloc_all:
6956 return err;
6957 }
6958
6959 static void __net_exit addrconf_exit_net(struct net *net)
6960 {
6961 #ifdef CONFIG_SYSCTL
6962 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
6963 NETCONFA_IFINDEX_DEFAULT);
6964 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
6965 NETCONFA_IFINDEX_ALL);
6966 #endif
6967 kfree(net->ipv6.devconf_dflt);
6968 kfree(net->ipv6.devconf_all);
6969 }
6970
6971 static struct pernet_operations addrconf_ops = {
6972 .init = addrconf_init_net,
6973 .exit = addrconf_exit_net,
6974 };
6975
6976 static struct rtnl_af_ops inet6_ops __read_mostly = {
6977 .family = AF_INET6,
6978 .fill_link_af = inet6_fill_link_af,
6979 .get_link_af_size = inet6_get_link_af_size,
6980 .validate_link_af = inet6_validate_link_af,
6981 .set_link_af = inet6_set_link_af,
6982 };
6983
6984 /*
6985 * Init / cleanup code
6986 */
6987
6988 int __init addrconf_init(void)
6989 {
6990 struct inet6_dev *idev;
6991 int i, err;
6992
6993 err = ipv6_addr_label_init();
6994 if (err < 0) {
6995 pr_crit("%s: cannot initialize default policy table: %d\n",
6996 __func__, err);
6997 goto out;
6998 }
6999
7000 err = register_pernet_subsys(&addrconf_ops);
7001 if (err < 0)
7002 goto out_addrlabel;
7003
7004 addrconf_wq = create_workqueue("ipv6_addrconf");
7005 if (!addrconf_wq) {
7006 err = -ENOMEM;
7007 goto out_nowq;
7008 }
7009
7010 /* The addrconf netdev notifier requires that loopback_dev
7011 * has it's ipv6 private information allocated and setup
7012 * before it can bring up and give link-local addresses
7013 * to other devices which are up.
7014 *
7015 * Unfortunately, loopback_dev is not necessarily the first
7016 * entry in the global dev_base list of net devices. In fact,
7017 * it is likely to be the very last entry on that list.
7018 * So this causes the notifier registry below to try and
7019 * give link-local addresses to all devices besides loopback_dev
7020 * first, then loopback_dev, which cases all the non-loopback_dev
7021 * devices to fail to get a link-local address.
7022 *
7023 * So, as a temporary fix, allocate the ipv6 structure for
7024 * loopback_dev first by hand.
7025 * Longer term, all of the dependencies ipv6 has upon the loopback
7026 * device and it being up should be removed.
7027 */
7028 rtnl_lock();
7029 idev = ipv6_add_dev(init_net.loopback_dev);
7030 rtnl_unlock();
7031 if (IS_ERR(idev)) {
7032 err = PTR_ERR(idev);
7033 goto errlo;
7034 }
7035
7036 ip6_route_init_special_entries();
7037
7038 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7039 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7040
7041 register_netdevice_notifier(&ipv6_dev_notf);
7042
7043 addrconf_verify();
7044
7045 rtnl_af_register(&inet6_ops);
7046
7047 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7048 NULL, inet6_dump_ifinfo, 0);
7049 if (err < 0)
7050 goto errout;
7051
7052 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7053 inet6_rtm_newaddr, NULL, 0);
7054 if (err < 0)
7055 goto errout;
7056 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7057 inet6_rtm_deladdr, NULL, 0);
7058 if (err < 0)
7059 goto errout;
7060 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7061 inet6_rtm_getaddr, inet6_dump_ifaddr,
7062 RTNL_FLAG_DOIT_UNLOCKED);
7063 if (err < 0)
7064 goto errout;
7065 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7066 NULL, inet6_dump_ifmcaddr, 0);
7067 if (err < 0)
7068 goto errout;
7069 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7070 NULL, inet6_dump_ifacaddr, 0);
7071 if (err < 0)
7072 goto errout;
7073 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7074 inet6_netconf_get_devconf,
7075 inet6_netconf_dump_devconf,
7076 RTNL_FLAG_DOIT_UNLOCKED);
7077 if (err < 0)
7078 goto errout;
7079 err = ipv6_addr_label_rtnl_register();
7080 if (err < 0)
7081 goto errout;
7082
7083 return 0;
7084 errout:
7085 rtnl_unregister_all(PF_INET6);
7086 rtnl_af_unregister(&inet6_ops);
7087 unregister_netdevice_notifier(&ipv6_dev_notf);
7088 errlo:
7089 destroy_workqueue(addrconf_wq);
7090 out_nowq:
7091 unregister_pernet_subsys(&addrconf_ops);
7092 out_addrlabel:
7093 ipv6_addr_label_cleanup();
7094 out:
7095 return err;
7096 }
7097
7098 void addrconf_cleanup(void)
7099 {
7100 struct net_device *dev;
7101 int i;
7102
7103 unregister_netdevice_notifier(&ipv6_dev_notf);
7104 unregister_pernet_subsys(&addrconf_ops);
7105 ipv6_addr_label_cleanup();
7106
7107 rtnl_af_unregister(&inet6_ops);
7108
7109 rtnl_lock();
7110
7111 /* clean dev list */
7112 for_each_netdev(&init_net, dev) {
7113 if (__in6_dev_get(dev) == NULL)
7114 continue;
7115 addrconf_ifdown(dev, 1);
7116 }
7117 addrconf_ifdown(init_net.loopback_dev, 2);
7118
7119 /*
7120 * Check hash table.
7121 */
7122 spin_lock_bh(&addrconf_hash_lock);
7123 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7124 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7125 spin_unlock_bh(&addrconf_hash_lock);
7126 cancel_delayed_work(&addr_chk_work);
7127 rtnl_unlock();
7128
7129 destroy_workqueue(addrconf_wq);
7130 }
Mirror of linux-2.6-arm at arm.linux.org.uk