1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_addr.h>
53 #include <linux/if_arp.h>
54 #include <linux/if_arcnet.h>
55 #include <linux/if_infiniband.h>
56 #include <linux/route.h>
57 #include <linux/inetdevice.h>
58 #include <linux/init.h>
59 #include <linux/slab.h>
60 #ifdef CONFIG_SYSCTL
61 #include <linux/sysctl.h>
62 #endif
63 #include <linux/capability.h>
64 #include <linux/delay.h>
65 #include <linux/notifier.h>
66 #include <linux/string.h>
67 #include <linux/hash.h>
68
69 #include <net/net_namespace.h>
70 #include <net/sock.h>
71 #include <net/snmp.h>
72
73 #include <net/af_ieee802154.h>
74 #include <net/firewire.h>
75 #include <net/ipv6.h>
76 #include <net/protocol.h>
77 #include <net/ndisc.h>
78 #include <net/ip6_route.h>
79 #include <net/addrconf.h>
80 #include <net/tcp.h>
81 #include <net/ip.h>
82 #include <net/netlink.h>
83 #include <net/pkt_sched.h>
84 #include <linux/if_tunnel.h>
85 #include <linux/rtnetlink.h>
86 #include <linux/netconf.h>
87 #include <linux/random.h>
88 #include <linux/uaccess.h>
89 #include <asm/unaligned.h>
90
91 #include <linux/proc_fs.h>
92 #include <linux/seq_file.h>
93 #include <linux/export.h>
94
95 /* Set to 3 to get tracing... */
96 #define ACONF_DEBUG 2
97
98 #if ACONF_DEBUG >= 3
99 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
100 #else
101 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
102 #endif
103
104 #define INFINITY_LIFE_TIME 0xFFFFFFFF
105
106 #define IPV6_MAX_STRLEN \
107 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
108
cstamp_delta(unsigned long cstamp)109 static inline u32 cstamp_delta(unsigned long cstamp)
110 {
111 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
112 }
113
114 #ifdef CONFIG_SYSCTL
115 static int addrconf_sysctl_register(struct inet6_dev *idev);
116 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
117 #else
addrconf_sysctl_register(struct inet6_dev * idev)118 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
119 {
120 return 0;
121 }
122
addrconf_sysctl_unregister(struct inet6_dev * idev)123 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
124 {
125 }
126 #endif
127
128 static void __ipv6_regen_rndid(struct inet6_dev *idev);
129 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
130 static void ipv6_regen_rndid(unsigned long data);
131
132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
133 static int ipv6_count_addresses(struct inet6_dev *idev);
134 static int ipv6_generate_stable_address(struct in6_addr *addr,
135 u8 dad_count,
136 const struct inet6_dev *idev);
137
138 /*
139 * Configured unicast address hash table
140 */
141 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
142 static DEFINE_SPINLOCK(addrconf_hash_lock);
143
144 static void addrconf_verify(void);
145 static void addrconf_verify_rtnl(void);
146 static void addrconf_verify_work(struct work_struct *);
147
148 static struct workqueue_struct *addrconf_wq;
149 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
150
151 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
152 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
153
154 static void addrconf_type_change(struct net_device *dev,
155 unsigned long event);
156 static int addrconf_ifdown(struct net_device *dev, int how);
157
158 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
159 int plen,
160 const struct net_device *dev,
161 u32 flags, u32 noflags);
162
163 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
164 static void addrconf_dad_work(struct work_struct *w);
165 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
166 static void addrconf_dad_run(struct inet6_dev *idev);
167 static void addrconf_rs_timer(unsigned long data);
168 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
169 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170
171 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
172 struct prefix_info *pinfo);
173 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
174 struct net_device *dev);
175
176 static struct ipv6_devconf ipv6_devconf __read_mostly = {
177 .forwarding = 0,
178 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
179 .mtu6 = IPV6_MIN_MTU,
180 .accept_ra = 1,
181 .accept_redirects = 1,
182 .autoconf = 1,
183 .force_mld_version = 0,
184 .mldv1_unsolicited_report_interval = 10 * HZ,
185 .mldv2_unsolicited_report_interval = HZ,
186 .dad_transmits = 1,
187 .rtr_solicits = MAX_RTR_SOLICITATIONS,
188 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
189 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
190 .use_tempaddr = 0,
191 .temp_valid_lft = TEMP_VALID_LIFETIME,
192 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
193 .regen_max_retry = REGEN_MAX_RETRY,
194 .max_desync_factor = MAX_DESYNC_FACTOR,
195 .max_addresses = IPV6_MAX_ADDRESSES,
196 .accept_ra_defrtr = 1,
197 .accept_ra_from_local = 0,
198 .accept_ra_min_hop_limit= 1,
199 .accept_ra_pinfo = 1,
200 #ifdef CONFIG_IPV6_ROUTER_PREF
201 .accept_ra_rtr_pref = 1,
202 .rtr_probe_interval = 60 * HZ,
203 #ifdef CONFIG_IPV6_ROUTE_INFO
204 .accept_ra_rt_info_max_plen = 0,
205 #endif
206 #endif
207 .proxy_ndp = 0,
208 .accept_source_route = 0, /* we do not accept RH0 by default. */
209 .disable_ipv6 = 0,
210 .accept_dad = 1,
211 .suppress_frag_ndisc = 1,
212 .accept_ra_mtu = 1,
213 .stable_secret = {
214 .initialized = false,
215 }
216 };
217
218 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
219 .forwarding = 0,
220 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
221 .mtu6 = IPV6_MIN_MTU,
222 .accept_ra = 1,
223 .accept_redirects = 1,
224 .autoconf = 1,
225 .force_mld_version = 0,
226 .mldv1_unsolicited_report_interval = 10 * HZ,
227 .mldv2_unsolicited_report_interval = HZ,
228 .dad_transmits = 1,
229 .rtr_solicits = MAX_RTR_SOLICITATIONS,
230 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
231 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
232 .use_tempaddr = 0,
233 .temp_valid_lft = TEMP_VALID_LIFETIME,
234 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
235 .regen_max_retry = REGEN_MAX_RETRY,
236 .max_desync_factor = MAX_DESYNC_FACTOR,
237 .max_addresses = IPV6_MAX_ADDRESSES,
238 .accept_ra_defrtr = 1,
239 .accept_ra_from_local = 0,
240 .accept_ra_min_hop_limit= 1,
241 .accept_ra_pinfo = 1,
242 #ifdef CONFIG_IPV6_ROUTER_PREF
243 .accept_ra_rtr_pref = 1,
244 .rtr_probe_interval = 60 * HZ,
245 #ifdef CONFIG_IPV6_ROUTE_INFO
246 .accept_ra_rt_info_max_plen = 0,
247 #endif
248 #endif
249 .proxy_ndp = 0,
250 .accept_source_route = 0, /* we do not accept RH0 by default. */
251 .disable_ipv6 = 0,
252 .accept_dad = 1,
253 .suppress_frag_ndisc = 1,
254 .accept_ra_mtu = 1,
255 .stable_secret = {
256 .initialized = false,
257 },
258 };
259
260 /* Check if a valid qdisc is available */
addrconf_qdisc_ok(const struct net_device * dev)261 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
262 {
263 return !qdisc_tx_is_noop(dev);
264 }
265
addrconf_del_rs_timer(struct inet6_dev * idev)266 static void addrconf_del_rs_timer(struct inet6_dev *idev)
267 {
268 if (del_timer(&idev->rs_timer))
269 __in6_dev_put(idev);
270 }
271
addrconf_del_dad_work(struct inet6_ifaddr * ifp)272 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
273 {
274 if (cancel_delayed_work(&ifp->dad_work))
275 __in6_ifa_put(ifp);
276 }
277
addrconf_mod_rs_timer(struct inet6_dev * idev,unsigned long when)278 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
279 unsigned long when)
280 {
281 if (!timer_pending(&idev->rs_timer))
282 in6_dev_hold(idev);
283 mod_timer(&idev->rs_timer, jiffies + when);
284 }
285
addrconf_mod_dad_work(struct inet6_ifaddr * ifp,unsigned long delay)286 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
287 unsigned long delay)
288 {
289 if (!delayed_work_pending(&ifp->dad_work))
290 in6_ifa_hold(ifp);
291 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
292 }
293
snmp6_alloc_dev(struct inet6_dev * idev)294 static int snmp6_alloc_dev(struct inet6_dev *idev)
295 {
296 int i;
297
298 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
299 if (!idev->stats.ipv6)
300 goto err_ip;
301
302 for_each_possible_cpu(i) {
303 struct ipstats_mib *addrconf_stats;
304 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
305 u64_stats_init(&addrconf_stats->syncp);
306 }
307
308
309 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
310 GFP_KERNEL);
311 if (!idev->stats.icmpv6dev)
312 goto err_icmp;
313 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
314 GFP_KERNEL);
315 if (!idev->stats.icmpv6msgdev)
316 goto err_icmpmsg;
317
318 return 0;
319
320 err_icmpmsg:
321 kfree(idev->stats.icmpv6dev);
322 err_icmp:
323 free_percpu(idev->stats.ipv6);
324 err_ip:
325 return -ENOMEM;
326 }
327
ipv6_add_dev(struct net_device * dev)328 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
329 {
330 struct inet6_dev *ndev;
331 int err = -ENOMEM;
332
333 ASSERT_RTNL();
334
335 if (dev->mtu < IPV6_MIN_MTU)
336 return ERR_PTR(-EINVAL);
337
338 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
339 if (!ndev)
340 return ERR_PTR(err);
341
342 rwlock_init(&ndev->lock);
343 ndev->dev = dev;
344 INIT_LIST_HEAD(&ndev->addr_list);
345 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
346 (unsigned long)ndev);
347 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
348
349 if (ndev->cnf.stable_secret.initialized)
350 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
351 else
352 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
353
354 ndev->cnf.mtu6 = dev->mtu;
355 ndev->cnf.sysctl = NULL;
356 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
357 if (!ndev->nd_parms) {
358 kfree(ndev);
359 return ERR_PTR(err);
360 }
361 if (ndev->cnf.forwarding)
362 dev_disable_lro(dev);
363 /* We refer to the device */
364 dev_hold(dev);
365
366 if (snmp6_alloc_dev(ndev) < 0) {
367 ADBG(KERN_WARNING
368 "%s: cannot allocate memory for statistics; dev=%s.\n",
369 __func__, dev->name);
370 neigh_parms_release(&nd_tbl, ndev->nd_parms);
371 dev_put(dev);
372 kfree(ndev);
373 return ERR_PTR(err);
374 }
375
376 if (snmp6_register_dev(ndev) < 0) {
377 ADBG(KERN_WARNING
378 "%s: cannot create /proc/net/dev_snmp6/%s\n",
379 __func__, dev->name);
380 goto err_release;
381 }
382
383 /* One reference from device. We must do this before
384 * we invoke __ipv6_regen_rndid().
385 */
386 in6_dev_hold(ndev);
387
388 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
389 ndev->cnf.accept_dad = -1;
390
391 #if IS_ENABLED(CONFIG_IPV6_SIT)
392 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
393 pr_info("%s: Disabled Multicast RS\n", dev->name);
394 ndev->cnf.rtr_solicits = 0;
395 }
396 #endif
397
398 INIT_LIST_HEAD(&ndev->tempaddr_list);
399 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
400 if ((dev->flags&IFF_LOOPBACK) ||
401 dev->type == ARPHRD_TUNNEL ||
402 dev->type == ARPHRD_TUNNEL6 ||
403 dev->type == ARPHRD_SIT ||
404 dev->type == ARPHRD_NONE) {
405 ndev->cnf.use_tempaddr = -1;
406 } else {
407 in6_dev_hold(ndev);
408 ipv6_regen_rndid((unsigned long) ndev);
409 }
410
411 ndev->token = in6addr_any;
412
413 if (netif_running(dev) && addrconf_qdisc_ok(dev))
414 ndev->if_flags |= IF_READY;
415
416 ipv6_mc_init_dev(ndev);
417 ndev->tstamp = jiffies;
418 err = addrconf_sysctl_register(ndev);
419 if (err) {
420 ipv6_mc_destroy_dev(ndev);
421 del_timer(&ndev->regen_timer);
422 snmp6_unregister_dev(ndev);
423 goto err_release;
424 }
425 /* protected by rtnl_lock */
426 rcu_assign_pointer(dev->ip6_ptr, ndev);
427
428 /* Join interface-local all-node multicast group */
429 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
430
431 /* Join all-node multicast group */
432 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
433
434 /* Join all-router multicast group if forwarding is set */
435 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
436 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
437
438 return ndev;
439
440 err_release:
441 neigh_parms_release(&nd_tbl, ndev->nd_parms);
442 ndev->dead = 1;
443 in6_dev_finish_destroy(ndev);
444 return ERR_PTR(err);
445 }
446
ipv6_find_idev(struct net_device * dev)447 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
448 {
449 struct inet6_dev *idev;
450
451 ASSERT_RTNL();
452
453 idev = __in6_dev_get(dev);
454 if (!idev) {
455 idev = ipv6_add_dev(dev);
456 if (IS_ERR(idev))
457 return NULL;
458 }
459
460 if (dev->flags&IFF_UP)
461 ipv6_mc_up(idev);
462 return idev;
463 }
464
inet6_netconf_msgsize_devconf(int type)465 static int inet6_netconf_msgsize_devconf(int type)
466 {
467 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
468 + nla_total_size(4); /* NETCONFA_IFINDEX */
469
470 /* type -1 is used for ALL */
471 if (type == -1 || type == NETCONFA_FORWARDING)
472 size += nla_total_size(4);
473 #ifdef CONFIG_IPV6_MROUTE
474 if (type == -1 || type == NETCONFA_MC_FORWARDING)
475 size += nla_total_size(4);
476 #endif
477 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
478 size += nla_total_size(4);
479
480 return size;
481 }
482
inet6_netconf_fill_devconf(struct sk_buff * skb,int ifindex,struct ipv6_devconf * devconf,u32 portid,u32 seq,int event,unsigned int flags,int type)483 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
484 struct ipv6_devconf *devconf, u32 portid,
485 u32 seq, int event, unsigned int flags,
486 int type)
487 {
488 struct nlmsghdr *nlh;
489 struct netconfmsg *ncm;
490
491 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
492 flags);
493 if (!nlh)
494 return -EMSGSIZE;
495
496 ncm = nlmsg_data(nlh);
497 ncm->ncm_family = AF_INET6;
498
499 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
500 goto nla_put_failure;
501
502 /* type -1 is used for ALL */
503 if ((type == -1 || type == NETCONFA_FORWARDING) &&
504 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
505 goto nla_put_failure;
506 #ifdef CONFIG_IPV6_MROUTE
507 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
508 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
509 devconf->mc_forwarding) < 0)
510 goto nla_put_failure;
511 #endif
512 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
513 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
514 goto nla_put_failure;
515
516 nlmsg_end(skb, nlh);
517 return 0;
518
519 nla_put_failure:
520 nlmsg_cancel(skb, nlh);
521 return -EMSGSIZE;
522 }
523
inet6_netconf_notify_devconf(struct net * net,int type,int ifindex,struct ipv6_devconf * devconf)524 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
525 struct ipv6_devconf *devconf)
526 {
527 struct sk_buff *skb;
528 int err = -ENOBUFS;
529
530 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
531 if (!skb)
532 goto errout;
533
534 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
535 RTM_NEWNETCONF, 0, type);
536 if (err < 0) {
537 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
538 WARN_ON(err == -EMSGSIZE);
539 kfree_skb(skb);
540 goto errout;
541 }
542 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
543 return;
544 errout:
545 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
546 }
547
548 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
549 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
550 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
551 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
552 };
553
inet6_netconf_get_devconf(struct sk_buff * in_skb,struct nlmsghdr * nlh)554 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
555 struct nlmsghdr *nlh)
556 {
557 struct net *net = sock_net(in_skb->sk);
558 struct nlattr *tb[NETCONFA_MAX+1];
559 struct netconfmsg *ncm;
560 struct sk_buff *skb;
561 struct ipv6_devconf *devconf;
562 struct inet6_dev *in6_dev;
563 struct net_device *dev;
564 int ifindex;
565 int err;
566
567 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
568 devconf_ipv6_policy);
569 if (err < 0)
570 goto errout;
571
572 err = -EINVAL;
573 if (!tb[NETCONFA_IFINDEX])
574 goto errout;
575
576 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
577 switch (ifindex) {
578 case NETCONFA_IFINDEX_ALL:
579 devconf = net->ipv6.devconf_all;
580 break;
581 case NETCONFA_IFINDEX_DEFAULT:
582 devconf = net->ipv6.devconf_dflt;
583 break;
584 default:
585 dev = __dev_get_by_index(net, ifindex);
586 if (!dev)
587 goto errout;
588 in6_dev = __in6_dev_get(dev);
589 if (!in6_dev)
590 goto errout;
591 devconf = &in6_dev->cnf;
592 break;
593 }
594
595 err = -ENOBUFS;
596 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
597 if (!skb)
598 goto errout;
599
600 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
601 NETLINK_CB(in_skb).portid,
602 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
603 -1);
604 if (err < 0) {
605 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
606 WARN_ON(err == -EMSGSIZE);
607 kfree_skb(skb);
608 goto errout;
609 }
610 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
611 errout:
612 return err;
613 }
614
inet6_netconf_dump_devconf(struct sk_buff * skb,struct netlink_callback * cb)615 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
616 struct netlink_callback *cb)
617 {
618 struct net *net = sock_net(skb->sk);
619 int h, s_h;
620 int idx, s_idx;
621 struct net_device *dev;
622 struct inet6_dev *idev;
623 struct hlist_head *head;
624
625 s_h = cb->args[0];
626 s_idx = idx = cb->args[1];
627
628 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
629 idx = 0;
630 head = &net->dev_index_head[h];
631 rcu_read_lock();
632 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
633 net->dev_base_seq;
634 hlist_for_each_entry_rcu(dev, head, index_hlist) {
635 if (idx < s_idx)
636 goto cont;
637 idev = __in6_dev_get(dev);
638 if (!idev)
639 goto cont;
640
641 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
642 &idev->cnf,
643 NETLINK_CB(cb->skb).portid,
644 cb->nlh->nlmsg_seq,
645 RTM_NEWNETCONF,
646 NLM_F_MULTI,
647 -1) < 0) {
648 rcu_read_unlock();
649 goto done;
650 }
651 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
652 cont:
653 idx++;
654 }
655 rcu_read_unlock();
656 }
657 if (h == NETDEV_HASHENTRIES) {
658 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
659 net->ipv6.devconf_all,
660 NETLINK_CB(cb->skb).portid,
661 cb->nlh->nlmsg_seq,
662 RTM_NEWNETCONF, NLM_F_MULTI,
663 -1) < 0)
664 goto done;
665 else
666 h++;
667 }
668 if (h == NETDEV_HASHENTRIES + 1) {
669 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
670 net->ipv6.devconf_dflt,
671 NETLINK_CB(cb->skb).portid,
672 cb->nlh->nlmsg_seq,
673 RTM_NEWNETCONF, NLM_F_MULTI,
674 -1) < 0)
675 goto done;
676 else
677 h++;
678 }
679 done:
680 cb->args[0] = h;
681 cb->args[1] = idx;
682
683 return skb->len;
684 }
685
686 #ifdef CONFIG_SYSCTL
dev_forward_change(struct inet6_dev * idev)687 static void dev_forward_change(struct inet6_dev *idev)
688 {
689 struct net_device *dev;
690 struct inet6_ifaddr *ifa;
691
692 if (!idev)
693 return;
694 dev = idev->dev;
695 if (idev->cnf.forwarding)
696 dev_disable_lro(dev);
697 if (dev->flags & IFF_MULTICAST) {
698 if (idev->cnf.forwarding) {
699 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
700 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
701 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
702 } else {
703 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
704 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
705 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
706 }
707 }
708
709 list_for_each_entry(ifa, &idev->addr_list, if_list) {
710 if (ifa->flags&IFA_F_TENTATIVE)
711 continue;
712 if (idev->cnf.forwarding)
713 addrconf_join_anycast(ifa);
714 else
715 addrconf_leave_anycast(ifa);
716 }
717 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
718 dev->ifindex, &idev->cnf);
719 }
720
721
addrconf_forward_change(struct net * net,__s32 newf)722 static void addrconf_forward_change(struct net *net, __s32 newf)
723 {
724 struct net_device *dev;
725 struct inet6_dev *idev;
726
727 for_each_netdev(net, dev) {
728 idev = __in6_dev_get(dev);
729 if (idev) {
730 int changed = (!idev->cnf.forwarding) ^ (!newf);
731 idev->cnf.forwarding = newf;
732 if (changed)
733 dev_forward_change(idev);
734 }
735 }
736 }
737
addrconf_fixup_forwarding(struct ctl_table * table,int * p,int newf)738 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
739 {
740 struct net *net;
741 int old;
742
743 if (!rtnl_trylock())
744 return restart_syscall();
745
746 net = (struct net *)table->extra2;
747 old = *p;
748 *p = newf;
749
750 if (p == &net->ipv6.devconf_dflt->forwarding) {
751 if ((!newf) ^ (!old))
752 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
753 NETCONFA_IFINDEX_DEFAULT,
754 net->ipv6.devconf_dflt);
755 rtnl_unlock();
756 return 0;
757 }
758
759 if (p == &net->ipv6.devconf_all->forwarding) {
760 net->ipv6.devconf_dflt->forwarding = newf;
761 addrconf_forward_change(net, newf);
762 if ((!newf) ^ (!old))
763 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
764 NETCONFA_IFINDEX_ALL,
765 net->ipv6.devconf_all);
766 } else if ((!newf) ^ (!old))
767 dev_forward_change((struct inet6_dev *)table->extra1);
768 rtnl_unlock();
769
770 if (newf)
771 rt6_purge_dflt_routers(net);
772 return 1;
773 }
774 #endif
775
776 /* Nobody refers to this ifaddr, destroy it */
inet6_ifa_finish_destroy(struct inet6_ifaddr * ifp)777 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
778 {
779 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
780
781 #ifdef NET_REFCNT_DEBUG
782 pr_debug("%s\n", __func__);
783 #endif
784
785 in6_dev_put(ifp->idev);
786
787 if (cancel_delayed_work(&ifp->dad_work))
788 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
789 ifp);
790
791 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
792 pr_warn("Freeing alive inet6 address %p\n", ifp);
793 return;
794 }
795 ip6_rt_put(ifp->rt);
796
797 kfree_rcu(ifp, rcu);
798 }
799
800 static void
ipv6_link_dev_addr(struct inet6_dev * idev,struct inet6_ifaddr * ifp)801 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
802 {
803 struct list_head *p;
804 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
805
806 /*
807 * Each device address list is sorted in order of scope -
808 * global before linklocal.
809 */
810 list_for_each(p, &idev->addr_list) {
811 struct inet6_ifaddr *ifa
812 = list_entry(p, struct inet6_ifaddr, if_list);
813 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
814 break;
815 }
816
817 list_add_tail(&ifp->if_list, p);
818 }
819
inet6_addr_hash(const struct in6_addr * addr)820 static u32 inet6_addr_hash(const struct in6_addr *addr)
821 {
822 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
823 }
824
825 /* On success it returns ifp with increased reference count */
826
827 static struct inet6_ifaddr *
ipv6_add_addr(struct inet6_dev * idev,const struct in6_addr * addr,const struct in6_addr * peer_addr,int pfxlen,int scope,u32 flags,u32 valid_lft,u32 prefered_lft)828 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
829 const struct in6_addr *peer_addr, int pfxlen,
830 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
831 {
832 struct inet6_ifaddr *ifa = NULL;
833 struct rt6_info *rt;
834 unsigned int hash;
835 int err = 0;
836 int addr_type = ipv6_addr_type(addr);
837
838 if (addr_type == IPV6_ADDR_ANY ||
839 addr_type & IPV6_ADDR_MULTICAST ||
840 (!(idev->dev->flags & IFF_LOOPBACK) &&
841 addr_type & IPV6_ADDR_LOOPBACK))
842 return ERR_PTR(-EADDRNOTAVAIL);
843
844 rcu_read_lock_bh();
845 if (idev->dead) {
846 err = -ENODEV; /*XXX*/
847 goto out2;
848 }
849
850 if (idev->cnf.disable_ipv6) {
851 err = -EACCES;
852 goto out2;
853 }
854
855 spin_lock(&addrconf_hash_lock);
856
857 /* Ignore adding duplicate addresses on an interface */
858 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
859 ADBG("ipv6_add_addr: already assigned\n");
860 err = -EEXIST;
861 goto out;
862 }
863
864 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
865
866 if (!ifa) {
867 ADBG("ipv6_add_addr: malloc failed\n");
868 err = -ENOBUFS;
869 goto out;
870 }
871
872 rt = addrconf_dst_alloc(idev, addr, false);
873 if (IS_ERR(rt)) {
874 err = PTR_ERR(rt);
875 goto out;
876 }
877
878 neigh_parms_data_state_setall(idev->nd_parms);
879
880 ifa->addr = *addr;
881 if (peer_addr)
882 ifa->peer_addr = *peer_addr;
883
884 spin_lock_init(&ifa->lock);
885 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
886 INIT_HLIST_NODE(&ifa->addr_lst);
887 ifa->scope = scope;
888 ifa->prefix_len = pfxlen;
889 ifa->flags = flags | IFA_F_TENTATIVE;
890 ifa->valid_lft = valid_lft;
891 ifa->prefered_lft = prefered_lft;
892 ifa->cstamp = ifa->tstamp = jiffies;
893 ifa->tokenized = false;
894
895 ifa->rt = rt;
896
897 ifa->idev = idev;
898 in6_dev_hold(idev);
899 /* For caller */
900 in6_ifa_hold(ifa);
901
902 /* Add to big hash table */
903 hash = inet6_addr_hash(addr);
904
905 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
906 spin_unlock(&addrconf_hash_lock);
907
908 write_lock(&idev->lock);
909 /* Add to inet6_dev unicast addr list. */
910 ipv6_link_dev_addr(idev, ifa);
911
912 if (ifa->flags&IFA_F_TEMPORARY) {
913 list_add(&ifa->tmp_list, &idev->tempaddr_list);
914 in6_ifa_hold(ifa);
915 }
916
917 in6_ifa_hold(ifa);
918 write_unlock(&idev->lock);
919 out2:
920 rcu_read_unlock_bh();
921
922 if (likely(err == 0))
923 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
924 else {
925 kfree(ifa);
926 ifa = ERR_PTR(err);
927 }
928
929 return ifa;
930 out:
931 spin_unlock(&addrconf_hash_lock);
932 goto out2;
933 }
934
935 enum cleanup_prefix_rt_t {
936 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
937 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
938 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
939 };
940
941 /*
942 * Check, whether the prefix for ifp would still need a prefix route
943 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
944 * constants.
945 *
946 * 1) we don't purge prefix if address was not permanent.
947 * prefix is managed by its own lifetime.
948 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
949 * 3) if there are no addresses, delete prefix.
950 * 4) if there are still other permanent address(es),
951 * corresponding prefix is still permanent.
952 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
953 * don't purge the prefix, assume user space is managing it.
954 * 6) otherwise, update prefix lifetime to the
955 * longest valid lifetime among the corresponding
956 * addresses on the device.
957 * Note: subsequent RA will update lifetime.
958 **/
959 static enum cleanup_prefix_rt_t
check_cleanup_prefix_route(struct inet6_ifaddr * ifp,unsigned long * expires)960 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
961 {
962 struct inet6_ifaddr *ifa;
963 struct inet6_dev *idev = ifp->idev;
964 unsigned long lifetime;
965 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
966
967 *expires = jiffies;
968
969 list_for_each_entry(ifa, &idev->addr_list, if_list) {
970 if (ifa == ifp)
971 continue;
972 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
973 ifp->prefix_len))
974 continue;
975 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
976 return CLEANUP_PREFIX_RT_NOP;
977
978 action = CLEANUP_PREFIX_RT_EXPIRE;
979
980 spin_lock(&ifa->lock);
981
982 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
983 /*
984 * Note: Because this address is
985 * not permanent, lifetime <
986 * LONG_MAX / HZ here.
987 */
988 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
989 *expires = ifa->tstamp + lifetime * HZ;
990 spin_unlock(&ifa->lock);
991 }
992
993 return action;
994 }
995
996 static void
cleanup_prefix_route(struct inet6_ifaddr * ifp,unsigned long expires,bool del_rt)997 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
998 {
999 struct rt6_info *rt;
1000
1001 rt = addrconf_get_prefix_route(&ifp->addr,
1002 ifp->prefix_len,
1003 ifp->idev->dev,
1004 0, RTF_GATEWAY | RTF_DEFAULT);
1005 if (rt) {
1006 if (del_rt)
1007 ip6_del_rt(rt);
1008 else {
1009 if (!(rt->rt6i_flags & RTF_EXPIRES))
1010 rt6_set_expires(rt, expires);
1011 ip6_rt_put(rt);
1012 }
1013 }
1014 }
1015
1016
1017 /* This function wants to get referenced ifp and releases it before return */
1018
ipv6_del_addr(struct inet6_ifaddr * ifp)1019 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1020 {
1021 int state;
1022 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1023 unsigned long expires;
1024
1025 ASSERT_RTNL();
1026
1027 spin_lock_bh(&ifp->lock);
1028 state = ifp->state;
1029 ifp->state = INET6_IFADDR_STATE_DEAD;
1030 spin_unlock_bh(&ifp->lock);
1031
1032 if (state == INET6_IFADDR_STATE_DEAD)
1033 goto out;
1034
1035 spin_lock_bh(&addrconf_hash_lock);
1036 hlist_del_init_rcu(&ifp->addr_lst);
1037 spin_unlock_bh(&addrconf_hash_lock);
1038
1039 write_lock_bh(&ifp->idev->lock);
1040
1041 if (ifp->flags&IFA_F_TEMPORARY) {
1042 list_del(&ifp->tmp_list);
1043 if (ifp->ifpub) {
1044 in6_ifa_put(ifp->ifpub);
1045 ifp->ifpub = NULL;
1046 }
1047 __in6_ifa_put(ifp);
1048 }
1049
1050 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1051 action = check_cleanup_prefix_route(ifp, &expires);
1052
1053 list_del_init(&ifp->if_list);
1054 __in6_ifa_put(ifp);
1055
1056 write_unlock_bh(&ifp->idev->lock);
1057
1058 addrconf_del_dad_work(ifp);
1059
1060 ipv6_ifa_notify(RTM_DELADDR, ifp);
1061
1062 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1063
1064 if (action != CLEANUP_PREFIX_RT_NOP) {
1065 cleanup_prefix_route(ifp, expires,
1066 action == CLEANUP_PREFIX_RT_DEL);
1067 }
1068
1069 /* clean up prefsrc entries */
1070 rt6_remove_prefsrc(ifp);
1071 out:
1072 in6_ifa_put(ifp);
1073 }
1074
ipv6_create_tempaddr(struct inet6_ifaddr * ifp,struct inet6_ifaddr * ift)1075 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1076 {
1077 struct inet6_dev *idev = ifp->idev;
1078 struct in6_addr addr, *tmpaddr;
1079 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1080 unsigned long regen_advance;
1081 int tmp_plen;
1082 int ret = 0;
1083 u32 addr_flags;
1084 unsigned long now = jiffies;
1085
1086 write_lock_bh(&idev->lock);
1087 if (ift) {
1088 spin_lock_bh(&ift->lock);
1089 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1090 spin_unlock_bh(&ift->lock);
1091 tmpaddr = &addr;
1092 } else {
1093 tmpaddr = NULL;
1094 }
1095 retry:
1096 in6_dev_hold(idev);
1097 if (idev->cnf.use_tempaddr <= 0) {
1098 write_unlock_bh(&idev->lock);
1099 pr_info("%s: use_tempaddr is disabled\n", __func__);
1100 in6_dev_put(idev);
1101 ret = -1;
1102 goto out;
1103 }
1104 spin_lock_bh(&ifp->lock);
1105 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1106 idev->cnf.use_tempaddr = -1; /*XXX*/
1107 spin_unlock_bh(&ifp->lock);
1108 write_unlock_bh(&idev->lock);
1109 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1110 __func__);
1111 in6_dev_put(idev);
1112 ret = -1;
1113 goto out;
1114 }
1115 in6_ifa_hold(ifp);
1116 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1117 __ipv6_try_regen_rndid(idev, tmpaddr);
1118 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1119 age = (now - ifp->tstamp) / HZ;
1120 tmp_valid_lft = min_t(__u32,
1121 ifp->valid_lft,
1122 idev->cnf.temp_valid_lft + age);
1123 tmp_prefered_lft = min_t(__u32,
1124 ifp->prefered_lft,
1125 idev->cnf.temp_prefered_lft + age -
1126 idev->cnf.max_desync_factor);
1127 tmp_plen = ifp->prefix_len;
1128 tmp_tstamp = ifp->tstamp;
1129 spin_unlock_bh(&ifp->lock);
1130
1131 regen_advance = idev->cnf.regen_max_retry *
1132 idev->cnf.dad_transmits *
1133 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1134 write_unlock_bh(&idev->lock);
1135
1136 /* A temporary address is created only if this calculated Preferred
1137 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1138 * an implementation must not create a temporary address with a zero
1139 * Preferred Lifetime.
1140 * Use age calculation as in addrconf_verify to avoid unnecessary
1141 * temporary addresses being generated.
1142 */
1143 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1144 if (tmp_prefered_lft <= regen_advance + age) {
1145 in6_ifa_put(ifp);
1146 in6_dev_put(idev);
1147 ret = -1;
1148 goto out;
1149 }
1150
1151 addr_flags = IFA_F_TEMPORARY;
1152 /* set in addrconf_prefix_rcv() */
1153 if (ifp->flags & IFA_F_OPTIMISTIC)
1154 addr_flags |= IFA_F_OPTIMISTIC;
1155
1156 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1157 ipv6_addr_scope(&addr), addr_flags,
1158 tmp_valid_lft, tmp_prefered_lft);
1159 if (IS_ERR(ift)) {
1160 in6_ifa_put(ifp);
1161 in6_dev_put(idev);
1162 pr_info("%s: retry temporary address regeneration\n", __func__);
1163 tmpaddr = &addr;
1164 write_lock_bh(&idev->lock);
1165 goto retry;
1166 }
1167
1168 spin_lock_bh(&ift->lock);
1169 ift->ifpub = ifp;
1170 ift->cstamp = now;
1171 ift->tstamp = tmp_tstamp;
1172 spin_unlock_bh(&ift->lock);
1173
1174 addrconf_dad_start(ift);
1175 in6_ifa_put(ift);
1176 in6_dev_put(idev);
1177 out:
1178 return ret;
1179 }
1180
1181 /*
1182 * Choose an appropriate source address (RFC3484)
1183 */
1184 enum {
1185 IPV6_SADDR_RULE_INIT = 0,
1186 IPV6_SADDR_RULE_LOCAL,
1187 IPV6_SADDR_RULE_SCOPE,
1188 IPV6_SADDR_RULE_PREFERRED,
1189 #ifdef CONFIG_IPV6_MIP6
1190 IPV6_SADDR_RULE_HOA,
1191 #endif
1192 IPV6_SADDR_RULE_OIF,
1193 IPV6_SADDR_RULE_LABEL,
1194 IPV6_SADDR_RULE_PRIVACY,
1195 IPV6_SADDR_RULE_ORCHID,
1196 IPV6_SADDR_RULE_PREFIX,
1197 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1198 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1199 #endif
1200 IPV6_SADDR_RULE_MAX
1201 };
1202
1203 struct ipv6_saddr_score {
1204 int rule;
1205 int addr_type;
1206 struct inet6_ifaddr *ifa;
1207 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1208 int scopedist;
1209 int matchlen;
1210 };
1211
1212 struct ipv6_saddr_dst {
1213 const struct in6_addr *addr;
1214 int ifindex;
1215 int scope;
1216 int label;
1217 unsigned int prefs;
1218 };
1219
ipv6_saddr_preferred(int type)1220 static inline int ipv6_saddr_preferred(int type)
1221 {
1222 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1223 return 1;
1224 return 0;
1225 }
1226
ipv6_use_optimistic_addr(struct inet6_dev * idev)1227 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1228 {
1229 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1230 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1231 #else
1232 return false;
1233 #endif
1234 }
1235
ipv6_get_saddr_eval(struct net * net,struct ipv6_saddr_score * score,struct ipv6_saddr_dst * dst,int i)1236 static int ipv6_get_saddr_eval(struct net *net,
1237 struct ipv6_saddr_score *score,
1238 struct ipv6_saddr_dst *dst,
1239 int i)
1240 {
1241 int ret;
1242
1243 if (i <= score->rule) {
1244 switch (i) {
1245 case IPV6_SADDR_RULE_SCOPE:
1246 ret = score->scopedist;
1247 break;
1248 case IPV6_SADDR_RULE_PREFIX:
1249 ret = score->matchlen;
1250 break;
1251 default:
1252 ret = !!test_bit(i, score->scorebits);
1253 }
1254 goto out;
1255 }
1256
1257 switch (i) {
1258 case IPV6_SADDR_RULE_INIT:
1259 /* Rule 0: remember if hiscore is not ready yet */
1260 ret = !!score->ifa;
1261 break;
1262 case IPV6_SADDR_RULE_LOCAL:
1263 /* Rule 1: Prefer same address */
1264 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1265 break;
1266 case IPV6_SADDR_RULE_SCOPE:
1267 /* Rule 2: Prefer appropriate scope
1268 *
1269 * ret
1270 * ^
1271 * -1 | d 15
1272 * ---+--+-+---> scope
1273 * |
1274 * | d is scope of the destination.
1275 * B-d | \
1276 * | \ <- smaller scope is better if
1277 * B-15 | \ if scope is enough for destination.
1278 * | ret = B - scope (-1 <= scope >= d <= 15).
1279 * d-C-1 | /
1280 * |/ <- greater is better
1281 * -C / if scope is not enough for destination.
1282 * /| ret = scope - C (-1 <= d < scope <= 15).
1283 *
1284 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1285 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1286 * Assume B = 0 and we get C > 29.
1287 */
1288 ret = __ipv6_addr_src_scope(score->addr_type);
1289 if (ret >= dst->scope)
1290 ret = -ret;
1291 else
1292 ret -= 128; /* 30 is enough */
1293 score->scopedist = ret;
1294 break;
1295 case IPV6_SADDR_RULE_PREFERRED:
1296 {
1297 /* Rule 3: Avoid deprecated and optimistic addresses */
1298 u8 avoid = IFA_F_DEPRECATED;
1299
1300 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1301 avoid |= IFA_F_OPTIMISTIC;
1302 ret = ipv6_saddr_preferred(score->addr_type) ||
1303 !(score->ifa->flags & avoid);
1304 break;
1305 }
1306 #ifdef CONFIG_IPV6_MIP6
1307 case IPV6_SADDR_RULE_HOA:
1308 {
1309 /* Rule 4: Prefer home address */
1310 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1311 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1312 break;
1313 }
1314 #endif
1315 case IPV6_SADDR_RULE_OIF:
1316 /* Rule 5: Prefer outgoing interface */
1317 ret = (!dst->ifindex ||
1318 dst->ifindex == score->ifa->idev->dev->ifindex);
1319 break;
1320 case IPV6_SADDR_RULE_LABEL:
1321 /* Rule 6: Prefer matching label */
1322 ret = ipv6_addr_label(net,
1323 &score->ifa->addr, score->addr_type,
1324 score->ifa->idev->dev->ifindex) == dst->label;
1325 break;
1326 case IPV6_SADDR_RULE_PRIVACY:
1327 {
1328 /* Rule 7: Prefer public address
1329 * Note: prefer temporary address if use_tempaddr >= 2
1330 */
1331 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1332 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1333 score->ifa->idev->cnf.use_tempaddr >= 2;
1334 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1335 break;
1336 }
1337 case IPV6_SADDR_RULE_ORCHID:
1338 /* Rule 8-: Prefer ORCHID vs ORCHID or
1339 * non-ORCHID vs non-ORCHID
1340 */
1341 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1342 ipv6_addr_orchid(dst->addr));
1343 break;
1344 case IPV6_SADDR_RULE_PREFIX:
1345 /* Rule 8: Use longest matching prefix */
1346 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1347 if (ret > score->ifa->prefix_len)
1348 ret = score->ifa->prefix_len;
1349 score->matchlen = ret;
1350 break;
1351 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1352 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1353 /* Optimistic addresses still have lower precedence than other
1354 * preferred addresses.
1355 */
1356 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1357 break;
1358 #endif
1359 default:
1360 ret = 0;
1361 }
1362
1363 if (ret)
1364 __set_bit(i, score->scorebits);
1365 score->rule = i;
1366 out:
1367 return ret;
1368 }
1369
ipv6_dev_get_saddr(struct net * net,const struct net_device * dst_dev,const struct in6_addr * daddr,unsigned int prefs,struct in6_addr * saddr)1370 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1371 const struct in6_addr *daddr, unsigned int prefs,
1372 struct in6_addr *saddr)
1373 {
1374 struct ipv6_saddr_score scores[2],
1375 *score = &scores[0], *hiscore = &scores[1];
1376 struct ipv6_saddr_dst dst;
1377 struct net_device *dev;
1378 int dst_type;
1379
1380 dst_type = __ipv6_addr_type(daddr);
1381 dst.addr = daddr;
1382 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1383 dst.scope = __ipv6_addr_src_scope(dst_type);
1384 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1385 dst.prefs = prefs;
1386
1387 hiscore->rule = -1;
1388 hiscore->ifa = NULL;
1389
1390 rcu_read_lock();
1391
1392 for_each_netdev_rcu(net, dev) {
1393 struct inet6_dev *idev;
1394
1395 /* Candidate Source Address (section 4)
1396 * - multicast and link-local destination address,
1397 * the set of candidate source address MUST only
1398 * include addresses assigned to interfaces
1399 * belonging to the same link as the outgoing
1400 * interface.
1401 * (- For site-local destination addresses, the
1402 * set of candidate source addresses MUST only
1403 * include addresses assigned to interfaces
1404 * belonging to the same site as the outgoing
1405 * interface.)
1406 */
1407 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1408 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1409 dst.ifindex && dev->ifindex != dst.ifindex)
1410 continue;
1411
1412 idev = __in6_dev_get(dev);
1413 if (!idev)
1414 continue;
1415
1416 read_lock_bh(&idev->lock);
1417 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1418 int i;
1419
1420 /*
1421 * - Tentative Address (RFC2462 section 5.4)
1422 * - A tentative address is not considered
1423 * "assigned to an interface" in the traditional
1424 * sense, unless it is also flagged as optimistic.
1425 * - Candidate Source Address (section 4)
1426 * - In any case, anycast addresses, multicast
1427 * addresses, and the unspecified address MUST
1428 * NOT be included in a candidate set.
1429 */
1430 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1431 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1432 continue;
1433
1434 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1435
1436 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1437 score->addr_type & IPV6_ADDR_MULTICAST)) {
1438 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1439 dev->name);
1440 continue;
1441 }
1442
1443 score->rule = -1;
1444 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1445
1446 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1447 int minihiscore, miniscore;
1448
1449 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1450 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1451
1452 if (minihiscore > miniscore) {
1453 if (i == IPV6_SADDR_RULE_SCOPE &&
1454 score->scopedist > 0) {
1455 /*
1456 * special case:
1457 * each remaining entry
1458 * has too small (not enough)
1459 * scope, because ifa entries
1460 * are sorted by their scope
1461 * values.
1462 */
1463 goto try_nextdev;
1464 }
1465 break;
1466 } else if (minihiscore < miniscore) {
1467 if (hiscore->ifa)
1468 in6_ifa_put(hiscore->ifa);
1469
1470 in6_ifa_hold(score->ifa);
1471
1472 swap(hiscore, score);
1473
1474 /* restore our iterator */
1475 score->ifa = hiscore->ifa;
1476
1477 break;
1478 }
1479 }
1480 }
1481 try_nextdev:
1482 read_unlock_bh(&idev->lock);
1483 }
1484 rcu_read_unlock();
1485
1486 if (!hiscore->ifa)
1487 return -EADDRNOTAVAIL;
1488
1489 *saddr = hiscore->ifa->addr;
1490 in6_ifa_put(hiscore->ifa);
1491 return 0;
1492 }
1493 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1494
__ipv6_get_lladdr(struct inet6_dev * idev,struct in6_addr * addr,u32 banned_flags)1495 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1496 u32 banned_flags)
1497 {
1498 struct inet6_ifaddr *ifp;
1499 int err = -EADDRNOTAVAIL;
1500
1501 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1502 if (ifp->scope > IFA_LINK)
1503 break;
1504 if (ifp->scope == IFA_LINK &&
1505 !(ifp->flags & banned_flags)) {
1506 *addr = ifp->addr;
1507 err = 0;
1508 break;
1509 }
1510 }
1511 return err;
1512 }
1513
ipv6_get_lladdr(struct net_device * dev,struct in6_addr * addr,u32 banned_flags)1514 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1515 u32 banned_flags)
1516 {
1517 struct inet6_dev *idev;
1518 int err = -EADDRNOTAVAIL;
1519
1520 rcu_read_lock();
1521 idev = __in6_dev_get(dev);
1522 if (idev) {
1523 read_lock_bh(&idev->lock);
1524 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1525 read_unlock_bh(&idev->lock);
1526 }
1527 rcu_read_unlock();
1528 return err;
1529 }
1530
ipv6_count_addresses(struct inet6_dev * idev)1531 static int ipv6_count_addresses(struct inet6_dev *idev)
1532 {
1533 int cnt = 0;
1534 struct inet6_ifaddr *ifp;
1535
1536 read_lock_bh(&idev->lock);
1537 list_for_each_entry(ifp, &idev->addr_list, if_list)
1538 cnt++;
1539 read_unlock_bh(&idev->lock);
1540 return cnt;
1541 }
1542
ipv6_chk_addr(struct net * net,const struct in6_addr * addr,const struct net_device * dev,int strict)1543 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1544 const struct net_device *dev, int strict)
1545 {
1546 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1547 }
1548 EXPORT_SYMBOL(ipv6_chk_addr);
1549
ipv6_chk_addr_and_flags(struct net * net,const struct in6_addr * addr,const struct net_device * dev,int strict,u32 banned_flags)1550 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1551 const struct net_device *dev, int strict,
1552 u32 banned_flags)
1553 {
1554 struct inet6_ifaddr *ifp;
1555 unsigned int hash = inet6_addr_hash(addr);
1556 u32 ifp_flags;
1557
1558 rcu_read_lock_bh();
1559 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1560 if (!net_eq(dev_net(ifp->idev->dev), net))
1561 continue;
1562 /* Decouple optimistic from tentative for evaluation here.
1563 * Ban optimistic addresses explicitly, when required.
1564 */
1565 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1566 ? (ifp->flags&~IFA_F_TENTATIVE)
1567 : ifp->flags;
1568 if (ipv6_addr_equal(&ifp->addr, addr) &&
1569 !(ifp_flags&banned_flags) &&
1570 (!dev || ifp->idev->dev == dev ||
1571 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1572 rcu_read_unlock_bh();
1573 return 1;
1574 }
1575 }
1576
1577 rcu_read_unlock_bh();
1578 return 0;
1579 }
1580 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1581
ipv6_chk_same_addr(struct net * net,const struct in6_addr * addr,struct net_device * dev)1582 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1583 struct net_device *dev)
1584 {
1585 unsigned int hash = inet6_addr_hash(addr);
1586 struct inet6_ifaddr *ifp;
1587
1588 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1589 if (!net_eq(dev_net(ifp->idev->dev), net))
1590 continue;
1591 if (ipv6_addr_equal(&ifp->addr, addr)) {
1592 if (!dev || ifp->idev->dev == dev)
1593 return true;
1594 }
1595 }
1596 return false;
1597 }
1598
1599 /* Compares an address/prefix_len with addresses on device @dev.
1600 * If one is found it returns true.
1601 */
ipv6_chk_custom_prefix(const struct in6_addr * addr,const unsigned int prefix_len,struct net_device * dev)1602 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1603 const unsigned int prefix_len, struct net_device *dev)
1604 {
1605 struct inet6_dev *idev;
1606 struct inet6_ifaddr *ifa;
1607 bool ret = false;
1608
1609 rcu_read_lock();
1610 idev = __in6_dev_get(dev);
1611 if (idev) {
1612 read_lock_bh(&idev->lock);
1613 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1614 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1615 if (ret)
1616 break;
1617 }
1618 read_unlock_bh(&idev->lock);
1619 }
1620 rcu_read_unlock();
1621
1622 return ret;
1623 }
1624 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1625
ipv6_chk_prefix(const struct in6_addr * addr,struct net_device * dev)1626 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1627 {
1628 struct inet6_dev *idev;
1629 struct inet6_ifaddr *ifa;
1630 int onlink;
1631
1632 onlink = 0;
1633 rcu_read_lock();
1634 idev = __in6_dev_get(dev);
1635 if (idev) {
1636 read_lock_bh(&idev->lock);
1637 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1638 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1639 ifa->prefix_len);
1640 if (onlink)
1641 break;
1642 }
1643 read_unlock_bh(&idev->lock);
1644 }
1645 rcu_read_unlock();
1646 return onlink;
1647 }
1648 EXPORT_SYMBOL(ipv6_chk_prefix);
1649
ipv6_get_ifaddr(struct net * net,const struct in6_addr * addr,struct net_device * dev,int strict)1650 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1651 struct net_device *dev, int strict)
1652 {
1653 struct inet6_ifaddr *ifp, *result = NULL;
1654 unsigned int hash = inet6_addr_hash(addr);
1655
1656 rcu_read_lock_bh();
1657 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1658 if (!net_eq(dev_net(ifp->idev->dev), net))
1659 continue;
1660 if (ipv6_addr_equal(&ifp->addr, addr)) {
1661 if (!dev || ifp->idev->dev == dev ||
1662 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1663 result = ifp;
1664 in6_ifa_hold(ifp);
1665 break;
1666 }
1667 }
1668 }
1669 rcu_read_unlock_bh();
1670
1671 return result;
1672 }
1673
1674 /* Gets referenced address, destroys ifaddr */
1675
addrconf_dad_stop(struct inet6_ifaddr * ifp,int dad_failed)1676 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1677 {
1678 if (ifp->flags&IFA_F_PERMANENT) {
1679 spin_lock_bh(&ifp->lock);
1680 addrconf_del_dad_work(ifp);
1681 ifp->flags |= IFA_F_TENTATIVE;
1682 if (dad_failed)
1683 ifp->flags |= IFA_F_DADFAILED;
1684 spin_unlock_bh(&ifp->lock);
1685 if (dad_failed)
1686 ipv6_ifa_notify(0, ifp);
1687 in6_ifa_put(ifp);
1688 } else if (ifp->flags&IFA_F_TEMPORARY) {
1689 struct inet6_ifaddr *ifpub;
1690 spin_lock_bh(&ifp->lock);
1691 ifpub = ifp->ifpub;
1692 if (ifpub) {
1693 in6_ifa_hold(ifpub);
1694 spin_unlock_bh(&ifp->lock);
1695 ipv6_create_tempaddr(ifpub, ifp);
1696 in6_ifa_put(ifpub);
1697 } else {
1698 spin_unlock_bh(&ifp->lock);
1699 }
1700 ipv6_del_addr(ifp);
1701 } else {
1702 ipv6_del_addr(ifp);
1703 }
1704 }
1705
addrconf_dad_end(struct inet6_ifaddr * ifp)1706 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1707 {
1708 int err = -ENOENT;
1709
1710 spin_lock_bh(&ifp->lock);
1711 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1712 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1713 err = 0;
1714 }
1715 spin_unlock_bh(&ifp->lock);
1716
1717 return err;
1718 }
1719
addrconf_dad_failure(struct inet6_ifaddr * ifp)1720 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1721 {
1722 struct in6_addr addr;
1723 struct inet6_dev *idev = ifp->idev;
1724 struct net *net = dev_net(ifp->idev->dev);
1725
1726 if (addrconf_dad_end(ifp)) {
1727 in6_ifa_put(ifp);
1728 return;
1729 }
1730
1731 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1732 ifp->idev->dev->name, &ifp->addr);
1733
1734 spin_lock_bh(&ifp->lock);
1735
1736 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1737 int scope = ifp->scope;
1738 u32 flags = ifp->flags;
1739 struct in6_addr new_addr;
1740 struct inet6_ifaddr *ifp2;
1741 u32 valid_lft, preferred_lft;
1742 int pfxlen = ifp->prefix_len;
1743 int retries = ifp->stable_privacy_retry + 1;
1744
1745 if (retries > net->ipv6.sysctl.idgen_retries) {
1746 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1747 ifp->idev->dev->name);
1748 goto errdad;
1749 }
1750
1751 new_addr = ifp->addr;
1752 if (ipv6_generate_stable_address(&new_addr, retries,
1753 idev))
1754 goto errdad;
1755
1756 valid_lft = ifp->valid_lft;
1757 preferred_lft = ifp->prefered_lft;
1758
1759 spin_unlock_bh(&ifp->lock);
1760
1761 if (idev->cnf.max_addresses &&
1762 ipv6_count_addresses(idev) >=
1763 idev->cnf.max_addresses)
1764 goto lock_errdad;
1765
1766 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1767 ifp->idev->dev->name);
1768
1769 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1770 scope, flags, valid_lft,
1771 preferred_lft);
1772 if (IS_ERR(ifp2))
1773 goto lock_errdad;
1774
1775 spin_lock_bh(&ifp2->lock);
1776 ifp2->stable_privacy_retry = retries;
1777 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1778 spin_unlock_bh(&ifp2->lock);
1779
1780 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1781 in6_ifa_put(ifp2);
1782 lock_errdad:
1783 spin_lock_bh(&ifp->lock);
1784 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1785 addr.s6_addr32[0] = htonl(0xfe800000);
1786 addr.s6_addr32[1] = 0;
1787
1788 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1789 ipv6_addr_equal(&ifp->addr, &addr)) {
1790 /* DAD failed for link-local based on MAC address */
1791 idev->cnf.disable_ipv6 = 1;
1792
1793 pr_info("%s: IPv6 being disabled!\n",
1794 ifp->idev->dev->name);
1795 }
1796 }
1797
1798 errdad:
1799 /* transition from _POSTDAD to _ERRDAD */
1800 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1801 spin_unlock_bh(&ifp->lock);
1802
1803 addrconf_mod_dad_work(ifp, 0);
1804 }
1805
1806 /* Join to solicited addr multicast group.
1807 * caller must hold RTNL */
addrconf_join_solict(struct net_device * dev,const struct in6_addr * addr)1808 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1809 {
1810 struct in6_addr maddr;
1811
1812 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1813 return;
1814
1815 addrconf_addr_solict_mult(addr, &maddr);
1816 ipv6_dev_mc_inc(dev, &maddr);
1817 }
1818
1819 /* caller must hold RTNL */
addrconf_leave_solict(struct inet6_dev * idev,const struct in6_addr * addr)1820 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1821 {
1822 struct in6_addr maddr;
1823
1824 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1825 return;
1826
1827 addrconf_addr_solict_mult(addr, &maddr);
1828 __ipv6_dev_mc_dec(idev, &maddr);
1829 }
1830
1831 /* caller must hold RTNL */
addrconf_join_anycast(struct inet6_ifaddr * ifp)1832 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1833 {
1834 struct in6_addr addr;
1835
1836 if (ifp->prefix_len >= 127) /* RFC 6164 */
1837 return;
1838 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1839 if (ipv6_addr_any(&addr))
1840 return;
1841 __ipv6_dev_ac_inc(ifp->idev, &addr);
1842 }
1843
1844 /* caller must hold RTNL */
addrconf_leave_anycast(struct inet6_ifaddr * ifp)1845 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1846 {
1847 struct in6_addr addr;
1848
1849 if (ifp->prefix_len >= 127) /* RFC 6164 */
1850 return;
1851 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1852 if (ipv6_addr_any(&addr))
1853 return;
1854 __ipv6_dev_ac_dec(ifp->idev, &addr);
1855 }
1856
addrconf_ifid_eui48(u8 * eui,struct net_device * dev)1857 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1858 {
1859 if (dev->addr_len != ETH_ALEN)
1860 return -1;
1861 memcpy(eui, dev->dev_addr, 3);
1862 memcpy(eui + 5, dev->dev_addr + 3, 3);
1863
1864 /*
1865 * The zSeries OSA network cards can be shared among various
1866 * OS instances, but the OSA cards have only one MAC address.
1867 * This leads to duplicate address conflicts in conjunction
1868 * with IPv6 if more than one instance uses the same card.
1869 *
1870 * The driver for these cards can deliver a unique 16-bit
1871 * identifier for each instance sharing the same card. It is
1872 * placed instead of 0xFFFE in the interface identifier. The
1873 * "u" bit of the interface identifier is not inverted in this
1874 * case. Hence the resulting interface identifier has local
1875 * scope according to RFC2373.
1876 */
1877 if (dev->dev_id) {
1878 eui[3] = (dev->dev_id >> 8) & 0xFF;
1879 eui[4] = dev->dev_id & 0xFF;
1880 } else {
1881 eui[3] = 0xFF;
1882 eui[4] = 0xFE;
1883 eui[0] ^= 2;
1884 }
1885 return 0;
1886 }
1887
addrconf_ifid_eui64(u8 * eui,struct net_device * dev)1888 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1889 {
1890 if (dev->addr_len != IEEE802154_ADDR_LEN)
1891 return -1;
1892 memcpy(eui, dev->dev_addr, 8);
1893 eui[0] ^= 2;
1894 return 0;
1895 }
1896
addrconf_ifid_ieee1394(u8 * eui,struct net_device * dev)1897 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1898 {
1899 union fwnet_hwaddr *ha;
1900
1901 if (dev->addr_len != FWNET_ALEN)
1902 return -1;
1903
1904 ha = (union fwnet_hwaddr *)dev->dev_addr;
1905
1906 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1907 eui[0] ^= 2;
1908 return 0;
1909 }
1910
addrconf_ifid_arcnet(u8 * eui,struct net_device * dev)1911 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1912 {
1913 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1914 if (dev->addr_len != ARCNET_ALEN)
1915 return -1;
1916 memset(eui, 0, 7);
1917 eui[7] = *(u8 *)dev->dev_addr;
1918 return 0;
1919 }
1920
addrconf_ifid_infiniband(u8 * eui,struct net_device * dev)1921 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1922 {
1923 if (dev->addr_len != INFINIBAND_ALEN)
1924 return -1;
1925 memcpy(eui, dev->dev_addr + 12, 8);
1926 eui[0] |= 2;
1927 return 0;
1928 }
1929
__ipv6_isatap_ifid(u8 * eui,__be32 addr)1930 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1931 {
1932 if (addr == 0)
1933 return -1;
1934 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1935 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1936 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1937 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1938 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1939 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1940 eui[1] = 0;
1941 eui[2] = 0x5E;
1942 eui[3] = 0xFE;
1943 memcpy(eui + 4, &addr, 4);
1944 return 0;
1945 }
1946
addrconf_ifid_sit(u8 * eui,struct net_device * dev)1947 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1948 {
1949 if (dev->priv_flags & IFF_ISATAP)
1950 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1951 return -1;
1952 }
1953
addrconf_ifid_gre(u8 * eui,struct net_device * dev)1954 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1955 {
1956 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1957 }
1958
addrconf_ifid_ip6tnl(u8 * eui,struct net_device * dev)1959 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
1960 {
1961 memcpy(eui, dev->perm_addr, 3);
1962 memcpy(eui + 5, dev->perm_addr + 3, 3);
1963 eui[3] = 0xFF;
1964 eui[4] = 0xFE;
1965 eui[0] ^= 2;
1966 return 0;
1967 }
1968
ipv6_generate_eui64(u8 * eui,struct net_device * dev)1969 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1970 {
1971 switch (dev->type) {
1972 case ARPHRD_ETHER:
1973 case ARPHRD_FDDI:
1974 return addrconf_ifid_eui48(eui, dev);
1975 case ARPHRD_ARCNET:
1976 return addrconf_ifid_arcnet(eui, dev);
1977 case ARPHRD_INFINIBAND:
1978 return addrconf_ifid_infiniband(eui, dev);
1979 case ARPHRD_SIT:
1980 return addrconf_ifid_sit(eui, dev);
1981 case ARPHRD_IPGRE:
1982 return addrconf_ifid_gre(eui, dev);
1983 case ARPHRD_6LOWPAN:
1984 case ARPHRD_IEEE802154:
1985 return addrconf_ifid_eui64(eui, dev);
1986 case ARPHRD_IEEE1394:
1987 return addrconf_ifid_ieee1394(eui, dev);
1988 case ARPHRD_TUNNEL6:
1989 return addrconf_ifid_ip6tnl(eui, dev);
1990 }
1991 return -1;
1992 }
1993
ipv6_inherit_eui64(u8 * eui,struct inet6_dev * idev)1994 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1995 {
1996 int err = -1;
1997 struct inet6_ifaddr *ifp;
1998
1999 read_lock_bh(&idev->lock);
2000 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2001 if (ifp->scope > IFA_LINK)
2002 break;
2003 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2004 memcpy(eui, ifp->addr.s6_addr+8, 8);
2005 err = 0;
2006 break;
2007 }
2008 }
2009 read_unlock_bh(&idev->lock);
2010 return err;
2011 }
2012
2013 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
__ipv6_regen_rndid(struct inet6_dev * idev)2014 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2015 {
2016 regen:
2017 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2018 idev->rndid[0] &= ~0x02;
2019
2020 /*
2021 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2022 * check if generated address is not inappropriate
2023 *
2024 * - Reserved subnet anycast (RFC 2526)
2025 * 11111101 11....11 1xxxxxxx
2026 * - ISATAP (RFC4214) 6.1
2027 * 00-00-5E-FE-xx-xx-xx-xx
2028 * - value 0
2029 * - XXX: already assigned to an address on the device
2030 */
2031 if (idev->rndid[0] == 0xfd &&
2032 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2033 (idev->rndid[7]&0x80))
2034 goto regen;
2035 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2036 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2037 goto regen;
2038 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2039 goto regen;
2040 }
2041 }
2042
ipv6_regen_rndid(unsigned long data)2043 static void ipv6_regen_rndid(unsigned long data)
2044 {
2045 struct inet6_dev *idev = (struct inet6_dev *) data;
2046 unsigned long expires;
2047
2048 rcu_read_lock_bh();
2049 write_lock_bh(&idev->lock);
2050
2051 if (idev->dead)
2052 goto out;
2053
2054 __ipv6_regen_rndid(idev);
2055
2056 expires = jiffies +
2057 idev->cnf.temp_prefered_lft * HZ -
2058 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2059 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2060 idev->cnf.max_desync_factor * HZ;
2061 if (time_before(expires, jiffies)) {
2062 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2063 __func__, idev->dev->name);
2064 goto out;
2065 }
2066
2067 if (!mod_timer(&idev->regen_timer, expires))
2068 in6_dev_hold(idev);
2069
2070 out:
2071 write_unlock_bh(&idev->lock);
2072 rcu_read_unlock_bh();
2073 in6_dev_put(idev);
2074 }
2075
__ipv6_try_regen_rndid(struct inet6_dev * idev,struct in6_addr * tmpaddr)2076 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2077 {
2078 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2079 __ipv6_regen_rndid(idev);
2080 }
2081
2082 /*
2083 * Add prefix route.
2084 */
2085
2086 static void
addrconf_prefix_route(struct in6_addr * pfx,int plen,struct net_device * dev,unsigned long expires,u32 flags)2087 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2088 unsigned long expires, u32 flags)
2089 {
2090 struct fib6_config cfg = {
2091 .fc_table = RT6_TABLE_PREFIX,
2092 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2093 .fc_ifindex = dev->ifindex,
2094 .fc_expires = expires,
2095 .fc_dst_len = plen,
2096 .fc_flags = RTF_UP | flags,
2097 .fc_nlinfo.nl_net = dev_net(dev),
2098 .fc_protocol = RTPROT_KERNEL,
2099 };
2100
2101 cfg.fc_dst = *pfx;
2102
2103 /* Prevent useless cloning on PtP SIT.
2104 This thing is done here expecting that the whole
2105 class of non-broadcast devices need not cloning.
2106 */
2107 #if IS_ENABLED(CONFIG_IPV6_SIT)
2108 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2109 cfg.fc_flags |= RTF_NONEXTHOP;
2110 #endif
2111
2112 ip6_route_add(&cfg);
2113 }
2114
2115
addrconf_get_prefix_route(const struct in6_addr * pfx,int plen,const struct net_device * dev,u32 flags,u32 noflags)2116 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2117 int plen,
2118 const struct net_device *dev,
2119 u32 flags, u32 noflags)
2120 {
2121 struct fib6_node *fn;
2122 struct rt6_info *rt = NULL;
2123 struct fib6_table *table;
2124
2125 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
2126 if (!table)
2127 return NULL;
2128
2129 read_lock_bh(&table->tb6_lock);
2130 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2131 if (!fn)
2132 goto out;
2133 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2134 if (rt->dst.dev->ifindex != dev->ifindex)
2135 continue;
2136 if ((rt->rt6i_flags & flags) != flags)
2137 continue;
2138 if ((rt->rt6i_flags & noflags) != 0)
2139 continue;
2140 dst_hold(&rt->dst);
2141 break;
2142 }
2143 out:
2144 read_unlock_bh(&table->tb6_lock);
2145 return rt;
2146 }
2147
2148
2149 /* Create "default" multicast route to the interface */
2150
addrconf_add_mroute(struct net_device * dev)2151 static void addrconf_add_mroute(struct net_device *dev)
2152 {
2153 struct fib6_config cfg = {
2154 .fc_table = RT6_TABLE_LOCAL,
2155 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2156 .fc_ifindex = dev->ifindex,
2157 .fc_dst_len = 8,
2158 .fc_flags = RTF_UP,
2159 .fc_nlinfo.nl_net = dev_net(dev),
2160 };
2161
2162 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2163
2164 ip6_route_add(&cfg);
2165 }
2166
addrconf_add_dev(struct net_device * dev)2167 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2168 {
2169 struct inet6_dev *idev;
2170
2171 ASSERT_RTNL();
2172
2173 idev = ipv6_find_idev(dev);
2174 if (!idev)
2175 return ERR_PTR(-ENOBUFS);
2176
2177 if (idev->cnf.disable_ipv6)
2178 return ERR_PTR(-EACCES);
2179
2180 /* Add default multicast route */
2181 if (!(dev->flags & IFF_LOOPBACK))
2182 addrconf_add_mroute(dev);
2183
2184 return idev;
2185 }
2186
manage_tempaddrs(struct inet6_dev * idev,struct inet6_ifaddr * ifp,__u32 valid_lft,__u32 prefered_lft,bool create,unsigned long now)2187 static void manage_tempaddrs(struct inet6_dev *idev,
2188 struct inet6_ifaddr *ifp,
2189 __u32 valid_lft, __u32 prefered_lft,
2190 bool create, unsigned long now)
2191 {
2192 u32 flags;
2193 struct inet6_ifaddr *ift;
2194
2195 read_lock_bh(&idev->lock);
2196 /* update all temporary addresses in the list */
2197 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2198 int age, max_valid, max_prefered;
2199
2200 if (ifp != ift->ifpub)
2201 continue;
2202
2203 /* RFC 4941 section 3.3:
2204 * If a received option will extend the lifetime of a public
2205 * address, the lifetimes of temporary addresses should
2206 * be extended, subject to the overall constraint that no
2207 * temporary addresses should ever remain "valid" or "preferred"
2208 * for a time longer than (TEMP_VALID_LIFETIME) or
2209 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2210 */
2211 age = (now - ift->cstamp) / HZ;
2212 max_valid = idev->cnf.temp_valid_lft - age;
2213 if (max_valid < 0)
2214 max_valid = 0;
2215
2216 max_prefered = idev->cnf.temp_prefered_lft -
2217 idev->cnf.max_desync_factor - age;
2218 if (max_prefered < 0)
2219 max_prefered = 0;
2220
2221 if (valid_lft > max_valid)
2222 valid_lft = max_valid;
2223
2224 if (prefered_lft > max_prefered)
2225 prefered_lft = max_prefered;
2226
2227 spin_lock(&ift->lock);
2228 flags = ift->flags;
2229 ift->valid_lft = valid_lft;
2230 ift->prefered_lft = prefered_lft;
2231 ift->tstamp = now;
2232 if (prefered_lft > 0)
2233 ift->flags &= ~IFA_F_DEPRECATED;
2234
2235 spin_unlock(&ift->lock);
2236 if (!(flags&IFA_F_TENTATIVE))
2237 ipv6_ifa_notify(0, ift);
2238 }
2239
2240 if ((create || list_empty(&idev->tempaddr_list)) &&
2241 idev->cnf.use_tempaddr > 0) {
2242 /* When a new public address is created as described
2243 * in [ADDRCONF], also create a new temporary address.
2244 * Also create a temporary address if it's enabled but
2245 * no temporary address currently exists.
2246 */
2247 read_unlock_bh(&idev->lock);
2248 ipv6_create_tempaddr(ifp, NULL);
2249 } else {
2250 read_unlock_bh(&idev->lock);
2251 }
2252 }
2253
addrconf_prefix_rcv(struct net_device * dev,u8 * opt,int len,bool sllao)2254 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2255 {
2256 struct prefix_info *pinfo;
2257 __u32 valid_lft;
2258 __u32 prefered_lft;
2259 int addr_type;
2260 u32 addr_flags = 0;
2261 struct inet6_dev *in6_dev;
2262 struct net *net = dev_net(dev);
2263
2264 pinfo = (struct prefix_info *) opt;
2265
2266 if (len < sizeof(struct prefix_info)) {
2267 ADBG("addrconf: prefix option too short\n");
2268 return;
2269 }
2270
2271 /*
2272 * Validation checks ([ADDRCONF], page 19)
2273 */
2274
2275 addr_type = ipv6_addr_type(&pinfo->prefix);
2276
2277 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2278 return;
2279
2280 valid_lft = ntohl(pinfo->valid);
2281 prefered_lft = ntohl(pinfo->prefered);
2282
2283 if (prefered_lft > valid_lft) {
2284 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2285 return;
2286 }
2287
2288 in6_dev = in6_dev_get(dev);
2289
2290 if (!in6_dev) {
2291 net_dbg_ratelimited("addrconf: device %s not configured\n",
2292 dev->name);
2293 return;
2294 }
2295
2296 /*
2297 * Two things going on here:
2298 * 1) Add routes for on-link prefixes
2299 * 2) Configure prefixes with the auto flag set
2300 */
2301
2302 if (pinfo->onlink) {
2303 struct rt6_info *rt;
2304 unsigned long rt_expires;
2305
2306 /* Avoid arithmetic overflow. Really, we could
2307 * save rt_expires in seconds, likely valid_lft,
2308 * but it would require division in fib gc, that it
2309 * not good.
2310 */
2311 if (HZ > USER_HZ)
2312 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2313 else
2314 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2315
2316 if (addrconf_finite_timeout(rt_expires))
2317 rt_expires *= HZ;
2318
2319 rt = addrconf_get_prefix_route(&pinfo->prefix,
2320 pinfo->prefix_len,
2321 dev,
2322 RTF_ADDRCONF | RTF_PREFIX_RT,
2323 RTF_GATEWAY | RTF_DEFAULT);
2324
2325 if (rt) {
2326 /* Autoconf prefix route */
2327 if (valid_lft == 0) {
2328 ip6_del_rt(rt);
2329 rt = NULL;
2330 } else if (addrconf_finite_timeout(rt_expires)) {
2331 /* not infinity */
2332 rt6_set_expires(rt, jiffies + rt_expires);
2333 } else {
2334 rt6_clean_expires(rt);
2335 }
2336 } else if (valid_lft) {
2337 clock_t expires = 0;
2338 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2339 if (addrconf_finite_timeout(rt_expires)) {
2340 /* not infinity */
2341 flags |= RTF_EXPIRES;
2342 expires = jiffies_to_clock_t(rt_expires);
2343 }
2344 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2345 dev, expires, flags);
2346 }
2347 ip6_rt_put(rt);
2348 }
2349
2350 /* Try to figure out our local address for this prefix */
2351
2352 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2353 struct inet6_ifaddr *ifp;
2354 struct in6_addr addr;
2355 int create = 0, update_lft = 0;
2356 bool tokenized = false;
2357
2358 if (pinfo->prefix_len == 64) {
2359 memcpy(&addr, &pinfo->prefix, 8);
2360
2361 if (!ipv6_addr_any(&in6_dev->token)) {
2362 read_lock_bh(&in6_dev->lock);
2363 memcpy(addr.s6_addr + 8,
2364 in6_dev->token.s6_addr + 8, 8);
2365 read_unlock_bh(&in6_dev->lock);
2366 tokenized = true;
2367 } else if (in6_dev->addr_gen_mode ==
2368 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2369 !ipv6_generate_stable_address(&addr, 0,
2370 in6_dev)) {
2371 addr_flags |= IFA_F_STABLE_PRIVACY;
2372 goto ok;
2373 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2374 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2375 in6_dev_put(in6_dev);
2376 return;
2377 }
2378 goto ok;
2379 }
2380 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2381 pinfo->prefix_len);
2382 in6_dev_put(in6_dev);
2383 return;
2384
2385 ok:
2386
2387 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2388
2389 if (!ifp && valid_lft) {
2390 int max_addresses = in6_dev->cnf.max_addresses;
2391
2392 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2393 if (in6_dev->cnf.optimistic_dad &&
2394 !net->ipv6.devconf_all->forwarding && sllao)
2395 addr_flags |= IFA_F_OPTIMISTIC;
2396 #endif
2397
2398 /* Do not allow to create too much of autoconfigured
2399 * addresses; this would be too easy way to crash kernel.
2400 */
2401 if (!max_addresses ||
2402 ipv6_count_addresses(in6_dev) < max_addresses)
2403 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2404 pinfo->prefix_len,
2405 addr_type&IPV6_ADDR_SCOPE_MASK,
2406 addr_flags, valid_lft,
2407 prefered_lft);
2408
2409 if (IS_ERR_OR_NULL(ifp)) {
2410 in6_dev_put(in6_dev);
2411 return;
2412 }
2413
2414 update_lft = 0;
2415 create = 1;
2416 spin_lock_bh(&ifp->lock);
2417 ifp->flags |= IFA_F_MANAGETEMPADDR;
2418 ifp->cstamp = jiffies;
2419 ifp->tokenized = tokenized;
2420 spin_unlock_bh(&ifp->lock);
2421 addrconf_dad_start(ifp);
2422 }
2423
2424 if (ifp) {
2425 u32 flags;
2426 unsigned long now;
2427 u32 stored_lft;
2428
2429 /* update lifetime (RFC2462 5.5.3 e) */
2430 spin_lock_bh(&ifp->lock);
2431 now = jiffies;
2432 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2433 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2434 else
2435 stored_lft = 0;
2436 if (!update_lft && !create && stored_lft) {
2437 const u32 minimum_lft = min_t(u32,
2438 stored_lft, MIN_VALID_LIFETIME);
2439 valid_lft = max(valid_lft, minimum_lft);
2440
2441 /* RFC4862 Section 5.5.3e:
2442 * "Note that the preferred lifetime of the
2443 * corresponding address is always reset to
2444 * the Preferred Lifetime in the received
2445 * Prefix Information option, regardless of
2446 * whether the valid lifetime is also reset or
2447 * ignored."
2448 *
2449 * So we should always update prefered_lft here.
2450 */
2451 update_lft = 1;
2452 }
2453
2454 if (update_lft) {
2455 ifp->valid_lft = valid_lft;
2456 ifp->prefered_lft = prefered_lft;
2457 ifp->tstamp = now;
2458 flags = ifp->flags;
2459 ifp->flags &= ~IFA_F_DEPRECATED;
2460 spin_unlock_bh(&ifp->lock);
2461
2462 if (!(flags&IFA_F_TENTATIVE))
2463 ipv6_ifa_notify(0, ifp);
2464 } else
2465 spin_unlock_bh(&ifp->lock);
2466
2467 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2468 create, now);
2469
2470 in6_ifa_put(ifp);
2471 addrconf_verify();
2472 }
2473 }
2474 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2475 in6_dev_put(in6_dev);
2476 }
2477
2478 /*
2479 * Set destination address.
2480 * Special case for SIT interfaces where we create a new "virtual"
2481 * device.
2482 */
addrconf_set_dstaddr(struct net * net,void __user * arg)2483 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2484 {
2485 struct in6_ifreq ireq;
2486 struct net_device *dev;
2487 int err = -EINVAL;
2488
2489 rtnl_lock();
2490
2491 err = -EFAULT;
2492 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2493 goto err_exit;
2494
2495 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2496
2497 err = -ENODEV;
2498 if (!dev)
2499 goto err_exit;
2500
2501 #if IS_ENABLED(CONFIG_IPV6_SIT)
2502 if (dev->type == ARPHRD_SIT) {
2503 const struct net_device_ops *ops = dev->netdev_ops;
2504 struct ifreq ifr;
2505 struct ip_tunnel_parm p;
2506
2507 err = -EADDRNOTAVAIL;
2508 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2509 goto err_exit;
2510
2511 memset(&p, 0, sizeof(p));
2512 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2513 p.iph.saddr = 0;
2514 p.iph.version = 4;
2515 p.iph.ihl = 5;
2516 p.iph.protocol = IPPROTO_IPV6;
2517 p.iph.ttl = 64;
2518 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2519
2520 if (ops->ndo_do_ioctl) {
2521 mm_segment_t oldfs = get_fs();
2522
2523 set_fs(KERNEL_DS);
2524 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2525 set_fs(oldfs);
2526 } else
2527 err = -EOPNOTSUPP;
2528
2529 if (err == 0) {
2530 err = -ENOBUFS;
2531 dev = __dev_get_by_name(net, p.name);
2532 if (!dev)
2533 goto err_exit;
2534 err = dev_open(dev);
2535 }
2536 }
2537 #endif
2538
2539 err_exit:
2540 rtnl_unlock();
2541 return err;
2542 }
2543
ipv6_mc_config(struct sock * sk,bool join,const struct in6_addr * addr,int ifindex)2544 static int ipv6_mc_config(struct sock *sk, bool join,
2545 const struct in6_addr *addr, int ifindex)
2546 {
2547 int ret;
2548
2549 ASSERT_RTNL();
2550
2551 lock_sock(sk);
2552 if (join)
2553 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2554 else
2555 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2556 release_sock(sk);
2557
2558 return ret;
2559 }
2560
2561 /*
2562 * Manual configuration of address on an interface
2563 */
inet6_addr_add(struct net * net,int ifindex,const struct in6_addr * pfx,const struct in6_addr * peer_pfx,unsigned int plen,__u32 ifa_flags,__u32 prefered_lft,__u32 valid_lft)2564 static int inet6_addr_add(struct net *net, int ifindex,
2565 const struct in6_addr *pfx,
2566 const struct in6_addr *peer_pfx,
2567 unsigned int plen, __u32 ifa_flags,
2568 __u32 prefered_lft, __u32 valid_lft)
2569 {
2570 struct inet6_ifaddr *ifp;
2571 struct inet6_dev *idev;
2572 struct net_device *dev;
2573 unsigned long timeout;
2574 clock_t expires;
2575 int scope;
2576 u32 flags;
2577
2578 ASSERT_RTNL();
2579
2580 if (plen > 128)
2581 return -EINVAL;
2582
2583 /* check the lifetime */
2584 if (!valid_lft || prefered_lft > valid_lft)
2585 return -EINVAL;
2586
2587 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2588 return -EINVAL;
2589
2590 dev = __dev_get_by_index(net, ifindex);
2591 if (!dev)
2592 return -ENODEV;
2593
2594 idev = addrconf_add_dev(dev);
2595 if (IS_ERR(idev))
2596 return PTR_ERR(idev);
2597
2598 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2599 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2600 true, pfx, ifindex);
2601
2602 if (ret < 0)
2603 return ret;
2604 }
2605
2606 scope = ipv6_addr_scope(pfx);
2607
2608 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2609 if (addrconf_finite_timeout(timeout)) {
2610 expires = jiffies_to_clock_t(timeout * HZ);
2611 valid_lft = timeout;
2612 flags = RTF_EXPIRES;
2613 } else {
2614 expires = 0;
2615 flags = 0;
2616 ifa_flags |= IFA_F_PERMANENT;
2617 }
2618
2619 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2620 if (addrconf_finite_timeout(timeout)) {
2621 if (timeout == 0)
2622 ifa_flags |= IFA_F_DEPRECATED;
2623 prefered_lft = timeout;
2624 }
2625
2626 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2627 valid_lft, prefered_lft);
2628
2629 if (!IS_ERR(ifp)) {
2630 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2631 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2632 expires, flags);
2633 }
2634
2635 /*
2636 * Note that section 3.1 of RFC 4429 indicates
2637 * that the Optimistic flag should not be set for
2638 * manually configured addresses
2639 */
2640 addrconf_dad_start(ifp);
2641 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2642 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2643 true, jiffies);
2644 in6_ifa_put(ifp);
2645 addrconf_verify_rtnl();
2646 return 0;
2647 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2648 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2649 false, pfx, ifindex);
2650 }
2651
2652 return PTR_ERR(ifp);
2653 }
2654
inet6_addr_del(struct net * net,int ifindex,u32 ifa_flags,const struct in6_addr * pfx,unsigned int plen)2655 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2656 const struct in6_addr *pfx, unsigned int plen)
2657 {
2658 struct inet6_ifaddr *ifp;
2659 struct inet6_dev *idev;
2660 struct net_device *dev;
2661
2662 if (plen > 128)
2663 return -EINVAL;
2664
2665 dev = __dev_get_by_index(net, ifindex);
2666 if (!dev)
2667 return -ENODEV;
2668
2669 idev = __in6_dev_get(dev);
2670 if (!idev)
2671 return -ENXIO;
2672
2673 read_lock_bh(&idev->lock);
2674 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2675 if (ifp->prefix_len == plen &&
2676 ipv6_addr_equal(pfx, &ifp->addr)) {
2677 in6_ifa_hold(ifp);
2678 read_unlock_bh(&idev->lock);
2679
2680 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2681 (ifa_flags & IFA_F_MANAGETEMPADDR))
2682 manage_tempaddrs(idev, ifp, 0, 0, false,
2683 jiffies);
2684 ipv6_del_addr(ifp);
2685 addrconf_verify_rtnl();
2686 if (ipv6_addr_is_multicast(pfx)) {
2687 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2688 false, pfx, dev->ifindex);
2689 }
2690 return 0;
2691 }
2692 }
2693 read_unlock_bh(&idev->lock);
2694 return -EADDRNOTAVAIL;
2695 }
2696
2697
addrconf_add_ifaddr(struct net * net,void __user * arg)2698 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2699 {
2700 struct in6_ifreq ireq;
2701 int err;
2702
2703 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2704 return -EPERM;
2705
2706 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2707 return -EFAULT;
2708
2709 rtnl_lock();
2710 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2711 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2712 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2713 rtnl_unlock();
2714 return err;
2715 }
2716
addrconf_del_ifaddr(struct net * net,void __user * arg)2717 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2718 {
2719 struct in6_ifreq ireq;
2720 int err;
2721
2722 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2723 return -EPERM;
2724
2725 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2726 return -EFAULT;
2727
2728 rtnl_lock();
2729 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2730 ireq.ifr6_prefixlen);
2731 rtnl_unlock();
2732 return err;
2733 }
2734
add_addr(struct inet6_dev * idev,const struct in6_addr * addr,int plen,int scope)2735 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2736 int plen, int scope)
2737 {
2738 struct inet6_ifaddr *ifp;
2739
2740 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2741 scope, IFA_F_PERMANENT,
2742 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2743 if (!IS_ERR(ifp)) {
2744 spin_lock_bh(&ifp->lock);
2745 ifp->flags &= ~IFA_F_TENTATIVE;
2746 spin_unlock_bh(&ifp->lock);
2747 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2748 in6_ifa_put(ifp);
2749 }
2750 }
2751
2752 #if IS_ENABLED(CONFIG_IPV6_SIT)
sit_add_v4_addrs(struct inet6_dev * idev)2753 static void sit_add_v4_addrs(struct inet6_dev *idev)
2754 {
2755 struct in6_addr addr;
2756 struct net_device *dev;
2757 struct net *net = dev_net(idev->dev);
2758 int scope, plen;
2759 u32 pflags = 0;
2760
2761 ASSERT_RTNL();
2762
2763 memset(&addr, 0, sizeof(struct in6_addr));
2764 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2765
2766 if (idev->dev->flags&IFF_POINTOPOINT) {
2767 addr.s6_addr32[0] = htonl(0xfe800000);
2768 scope = IFA_LINK;
2769 plen = 64;
2770 } else {
2771 scope = IPV6_ADDR_COMPATv4;
2772 plen = 96;
2773 pflags |= RTF_NONEXTHOP;
2774 }
2775
2776 if (addr.s6_addr32[3]) {
2777 add_addr(idev, &addr, plen, scope);
2778 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2779 return;
2780 }
2781
2782 for_each_netdev(net, dev) {
2783 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2784 if (in_dev && (dev->flags & IFF_UP)) {
2785 struct in_ifaddr *ifa;
2786
2787 int flag = scope;
2788
2789 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2790
2791 addr.s6_addr32[3] = ifa->ifa_local;
2792
2793 if (ifa->ifa_scope == RT_SCOPE_LINK)
2794 continue;
2795 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2796 if (idev->dev->flags&IFF_POINTOPOINT)
2797 continue;
2798 flag |= IFA_HOST;
2799 }
2800
2801 add_addr(idev, &addr, plen, flag);
2802 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2803 pflags);
2804 }
2805 }
2806 }
2807 }
2808 #endif
2809
init_loopback(struct net_device * dev)2810 static void init_loopback(struct net_device *dev)
2811 {
2812 struct inet6_dev *idev;
2813 struct net_device *sp_dev;
2814 struct inet6_ifaddr *sp_ifa;
2815 struct rt6_info *sp_rt;
2816
2817 /* ::1 */
2818
2819 ASSERT_RTNL();
2820
2821 idev = ipv6_find_idev(dev);
2822 if (!idev) {
2823 pr_debug("%s: add_dev failed\n", __func__);
2824 return;
2825 }
2826
2827 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2828
2829 /* Add routes to other interface's IPv6 addresses */
2830 for_each_netdev(dev_net(dev), sp_dev) {
2831 if (!strcmp(sp_dev->name, dev->name))
2832 continue;
2833
2834 idev = __in6_dev_get(sp_dev);
2835 if (!idev)
2836 continue;
2837
2838 read_lock_bh(&idev->lock);
2839 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2840
2841 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2842 continue;
2843
2844 if (sp_ifa->rt) {
2845 /* This dst has been added to garbage list when
2846 * lo device down, release this obsolete dst and
2847 * reallocate a new router for ifa.
2848 */
2849 if (sp_ifa->rt->dst.obsolete > 0) {
2850 ip6_rt_put(sp_ifa->rt);
2851 sp_ifa->rt = NULL;
2852 } else {
2853 continue;
2854 }
2855 }
2856
2857 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2858
2859 /* Failure cases are ignored */
2860 if (!IS_ERR(sp_rt)) {
2861 sp_ifa->rt = sp_rt;
2862 ip6_ins_rt(sp_rt);
2863 }
2864 }
2865 read_unlock_bh(&idev->lock);
2866 }
2867 }
2868
addrconf_add_linklocal(struct inet6_dev * idev,const struct in6_addr * addr,u32 flags)2869 static void addrconf_add_linklocal(struct inet6_dev *idev,
2870 const struct in6_addr *addr, u32 flags)
2871 {
2872 struct inet6_ifaddr *ifp;
2873 u32 addr_flags = flags | IFA_F_PERMANENT;
2874
2875 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2876 if (idev->cnf.optimistic_dad &&
2877 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2878 addr_flags |= IFA_F_OPTIMISTIC;
2879 #endif
2880
2881 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2882 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2883 if (!IS_ERR(ifp)) {
2884 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2885 addrconf_dad_start(ifp);
2886 in6_ifa_put(ifp);
2887 }
2888 }
2889
ipv6_reserved_interfaceid(struct in6_addr address)2890 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2891 {
2892 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2893 return true;
2894
2895 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2896 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2897 return true;
2898
2899 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2900 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2901 return true;
2902
2903 return false;
2904 }
2905
ipv6_generate_stable_address(struct in6_addr * address,u8 dad_count,const struct inet6_dev * idev)2906 static int ipv6_generate_stable_address(struct in6_addr *address,
2907 u8 dad_count,
2908 const struct inet6_dev *idev)
2909 {
2910 static DEFINE_SPINLOCK(lock);
2911 static __u32 digest[SHA_DIGEST_WORDS];
2912 static __u32 workspace[SHA_WORKSPACE_WORDS];
2913
2914 static union {
2915 char __data[SHA_MESSAGE_BYTES];
2916 struct {
2917 struct in6_addr secret;
2918 __be32 prefix[2];
2919 unsigned char hwaddr[MAX_ADDR_LEN];
2920 u8 dad_count;
2921 } __packed;
2922 } data;
2923
2924 struct in6_addr secret;
2925 struct in6_addr temp;
2926 struct net *net = dev_net(idev->dev);
2927
2928 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2929
2930 if (idev->cnf.stable_secret.initialized)
2931 secret = idev->cnf.stable_secret.secret;
2932 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2933 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2934 else
2935 return -1;
2936
2937 retry:
2938 spin_lock_bh(&lock);
2939
2940 sha_init(digest);
2941 memset(&data, 0, sizeof(data));
2942 memset(workspace, 0, sizeof(workspace));
2943 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
2944 data.prefix[0] = address->s6_addr32[0];
2945 data.prefix[1] = address->s6_addr32[1];
2946 data.secret = secret;
2947 data.dad_count = dad_count;
2948
2949 sha_transform(digest, data.__data, workspace);
2950
2951 temp = *address;
2952 temp.s6_addr32[2] = (__force __be32)digest[0];
2953 temp.s6_addr32[3] = (__force __be32)digest[1];
2954
2955 spin_unlock_bh(&lock);
2956
2957 if (ipv6_reserved_interfaceid(temp)) {
2958 dad_count++;
2959 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
2960 return -1;
2961 goto retry;
2962 }
2963
2964 *address = temp;
2965 return 0;
2966 }
2967
addrconf_addr_gen(struct inet6_dev * idev,bool prefix_route)2968 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
2969 {
2970 struct in6_addr addr;
2971
2972 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2973
2974 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
2975 if (!ipv6_generate_stable_address(&addr, 0, idev))
2976 addrconf_add_linklocal(idev, &addr,
2977 IFA_F_STABLE_PRIVACY);
2978 else if (prefix_route)
2979 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2980 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
2981 /* addrconf_add_linklocal also adds a prefix_route and we
2982 * only need to care about prefix routes if ipv6_generate_eui64
2983 * couldn't generate one.
2984 */
2985 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
2986 addrconf_add_linklocal(idev, &addr, 0);
2987 else if (prefix_route)
2988 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
2989 }
2990 }
2991
addrconf_dev_config(struct net_device * dev)2992 static void addrconf_dev_config(struct net_device *dev)
2993 {
2994 struct inet6_dev *idev;
2995
2996 ASSERT_RTNL();
2997
2998 if ((dev->type != ARPHRD_ETHER) &&
2999 (dev->type != ARPHRD_FDDI) &&
3000 (dev->type != ARPHRD_ARCNET) &&
3001 (dev->type != ARPHRD_INFINIBAND) &&
3002 (dev->type != ARPHRD_IEEE802154) &&
3003 (dev->type != ARPHRD_IEEE1394) &&
3004 (dev->type != ARPHRD_TUNNEL6) &&
3005 (dev->type != ARPHRD_6LOWPAN)) {
3006 /* Alas, we support only Ethernet autoconfiguration. */
3007 return;
3008 }
3009
3010 idev = addrconf_add_dev(dev);
3011 if (IS_ERR(idev))
3012 return;
3013
3014 addrconf_addr_gen(idev, false);
3015 }
3016
3017 #if IS_ENABLED(CONFIG_IPV6_SIT)
addrconf_sit_config(struct net_device * dev)3018 static void addrconf_sit_config(struct net_device *dev)
3019 {
3020 struct inet6_dev *idev;
3021
3022 ASSERT_RTNL();
3023
3024 /*
3025 * Configure the tunnel with one of our IPv4
3026 * addresses... we should configure all of
3027 * our v4 addrs in the tunnel
3028 */
3029
3030 idev = ipv6_find_idev(dev);
3031 if (!idev) {
3032 pr_debug("%s: add_dev failed\n", __func__);
3033 return;
3034 }
3035
3036 if (dev->priv_flags & IFF_ISATAP) {
3037 addrconf_addr_gen(idev, false);
3038 return;
3039 }
3040
3041 sit_add_v4_addrs(idev);
3042
3043 if (dev->flags&IFF_POINTOPOINT)
3044 addrconf_add_mroute(dev);
3045 }
3046 #endif
3047
3048 #if IS_ENABLED(CONFIG_NET_IPGRE)
addrconf_gre_config(struct net_device * dev)3049 static void addrconf_gre_config(struct net_device *dev)
3050 {
3051 struct inet6_dev *idev;
3052
3053 ASSERT_RTNL();
3054
3055 idev = ipv6_find_idev(dev);
3056 if (!idev) {
3057 pr_debug("%s: add_dev failed\n", __func__);
3058 return;
3059 }
3060
3061 addrconf_addr_gen(idev, true);
3062 }
3063 #endif
3064
addrconf_notify(struct notifier_block * this,unsigned long event,void * ptr)3065 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3066 void *ptr)
3067 {
3068 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3069 struct inet6_dev *idev = __in6_dev_get(dev);
3070 int run_pending = 0;
3071 int err;
3072
3073 switch (event) {
3074 case NETDEV_REGISTER:
3075 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3076 idev = ipv6_add_dev(dev);
3077 if (IS_ERR(idev))
3078 return notifier_from_errno(PTR_ERR(idev));
3079 }
3080 break;
3081
3082 case NETDEV_UP:
3083 case NETDEV_CHANGE:
3084 if (dev->flags & IFF_SLAVE)
3085 break;
3086
3087 if (idev && idev->cnf.disable_ipv6)
3088 break;
3089
3090 if (event == NETDEV_UP) {
3091 if (!addrconf_qdisc_ok(dev)) {
3092 /* device is not ready yet. */
3093 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3094 dev->name);
3095 break;
3096 }
3097
3098 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3099 idev = ipv6_add_dev(dev);
3100
3101 if (!IS_ERR_OR_NULL(idev)) {
3102 idev->if_flags |= IF_READY;
3103 run_pending = 1;
3104 }
3105 } else {
3106 if (!addrconf_qdisc_ok(dev)) {
3107 /* device is still not ready. */
3108 break;
3109 }
3110
3111 if (idev) {
3112 if (idev->if_flags & IF_READY)
3113 /* device is already configured. */
3114 break;
3115 idev->if_flags |= IF_READY;
3116 }
3117
3118 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3119 dev->name);
3120
3121 run_pending = 1;
3122 }
3123
3124 switch (dev->type) {
3125 #if IS_ENABLED(CONFIG_IPV6_SIT)
3126 case ARPHRD_SIT:
3127 addrconf_sit_config(dev);
3128 break;
3129 #endif
3130 #if IS_ENABLED(CONFIG_NET_IPGRE)
3131 case ARPHRD_IPGRE:
3132 addrconf_gre_config(dev);
3133 break;
3134 #endif
3135 case ARPHRD_LOOPBACK:
3136 init_loopback(dev);
3137 break;
3138
3139 default:
3140 addrconf_dev_config(dev);
3141 break;
3142 }
3143
3144 if (!IS_ERR_OR_NULL(idev)) {
3145 if (run_pending)
3146 addrconf_dad_run(idev);
3147
3148 /*
3149 * If the MTU changed during the interface down,
3150 * when the interface up, the changed MTU must be
3151 * reflected in the idev as well as routers.
3152 */
3153 if (idev->cnf.mtu6 != dev->mtu &&
3154 dev->mtu >= IPV6_MIN_MTU) {
3155 rt6_mtu_change(dev, dev->mtu);
3156 idev->cnf.mtu6 = dev->mtu;
3157 }
3158 idev->tstamp = jiffies;
3159 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3160
3161 /*
3162 * If the changed mtu during down is lower than
3163 * IPV6_MIN_MTU stop IPv6 on this interface.
3164 */
3165 if (dev->mtu < IPV6_MIN_MTU)
3166 addrconf_ifdown(dev, 1);
3167 }
3168 break;
3169
3170 case NETDEV_CHANGEMTU:
3171 if (idev && dev->mtu >= IPV6_MIN_MTU) {
3172 rt6_mtu_change(dev, dev->mtu);
3173 idev->cnf.mtu6 = dev->mtu;
3174 break;
3175 }
3176
3177 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3178 idev = ipv6_add_dev(dev);
3179 if (!IS_ERR(idev))
3180 break;
3181 }
3182
3183 /*
3184 * if MTU under IPV6_MIN_MTU.
3185 * Stop IPv6 on this interface.
3186 */
3187
3188 case NETDEV_DOWN:
3189 case NETDEV_UNREGISTER:
3190 /*
3191 * Remove all addresses from this interface.
3192 */
3193 addrconf_ifdown(dev, event != NETDEV_DOWN);
3194 break;
3195
3196 case NETDEV_CHANGENAME:
3197 if (idev) {
3198 snmp6_unregister_dev(idev);
3199 addrconf_sysctl_unregister(idev);
3200 err = addrconf_sysctl_register(idev);
3201 if (err)
3202 return notifier_from_errno(err);
3203 err = snmp6_register_dev(idev);
3204 if (err) {
3205 addrconf_sysctl_unregister(idev);
3206 return notifier_from_errno(err);
3207 }
3208 }
3209 break;
3210
3211 case NETDEV_PRE_TYPE_CHANGE:
3212 case NETDEV_POST_TYPE_CHANGE:
3213 addrconf_type_change(dev, event);
3214 break;
3215 }
3216
3217 return NOTIFY_OK;
3218 }
3219
3220 /*
3221 * addrconf module should be notified of a device going up
3222 */
3223 static struct notifier_block ipv6_dev_notf = {
3224 .notifier_call = addrconf_notify,
3225 };
3226
addrconf_type_change(struct net_device * dev,unsigned long event)3227 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3228 {
3229 struct inet6_dev *idev;
3230 ASSERT_RTNL();
3231
3232 idev = __in6_dev_get(dev);
3233
3234 if (event == NETDEV_POST_TYPE_CHANGE)
3235 ipv6_mc_remap(idev);
3236 else if (event == NETDEV_PRE_TYPE_CHANGE)
3237 ipv6_mc_unmap(idev);
3238 }
3239
addrconf_ifdown(struct net_device * dev,int how)3240 static int addrconf_ifdown(struct net_device *dev, int how)
3241 {
3242 struct net *net = dev_net(dev);
3243 struct inet6_dev *idev;
3244 struct inet6_ifaddr *ifa;
3245 int state, i;
3246
3247 ASSERT_RTNL();
3248
3249 rt6_ifdown(net, dev);
3250 neigh_ifdown(&nd_tbl, dev);
3251
3252 idev = __in6_dev_get(dev);
3253 if (!idev)
3254 return -ENODEV;
3255
3256 /*
3257 * Step 1: remove reference to ipv6 device from parent device.
3258 * Do not dev_put!
3259 */
3260 if (how) {
3261 idev->dead = 1;
3262
3263 /* protected by rtnl_lock */
3264 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3265
3266 /* Step 1.5: remove snmp6 entry */
3267 snmp6_unregister_dev(idev);
3268
3269 }
3270
3271 /* Step 2: clear hash table */
3272 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3273 struct hlist_head *h = &inet6_addr_lst[i];
3274
3275 spin_lock_bh(&addrconf_hash_lock);
3276 restart:
3277 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3278 if (ifa->idev == idev) {
3279 hlist_del_init_rcu(&ifa->addr_lst);
3280 addrconf_del_dad_work(ifa);
3281 goto restart;
3282 }
3283 }
3284 spin_unlock_bh(&addrconf_hash_lock);
3285 }
3286
3287 write_lock_bh(&idev->lock);
3288
3289 addrconf_del_rs_timer(idev);
3290
3291 /* Step 2: clear flags for stateless addrconf */
3292 if (!how)
3293 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3294
3295 if (how && del_timer(&idev->regen_timer))
3296 in6_dev_put(idev);
3297
3298 /* Step 3: clear tempaddr list */
3299 while (!list_empty(&idev->tempaddr_list)) {
3300 ifa = list_first_entry(&idev->tempaddr_list,
3301 struct inet6_ifaddr, tmp_list);
3302 list_del(&ifa->tmp_list);
3303 write_unlock_bh(&idev->lock);
3304 spin_lock_bh(&ifa->lock);
3305
3306 if (ifa->ifpub) {
3307 in6_ifa_put(ifa->ifpub);
3308 ifa->ifpub = NULL;
3309 }
3310 spin_unlock_bh(&ifa->lock);
3311 in6_ifa_put(ifa);
3312 write_lock_bh(&idev->lock);
3313 }
3314
3315 while (!list_empty(&idev->addr_list)) {
3316 ifa = list_first_entry(&idev->addr_list,
3317 struct inet6_ifaddr, if_list);
3318 addrconf_del_dad_work(ifa);
3319
3320 list_del(&ifa->if_list);
3321
3322 write_unlock_bh(&idev->lock);
3323
3324 spin_lock_bh(&ifa->lock);
3325 state = ifa->state;
3326 ifa->state = INET6_IFADDR_STATE_DEAD;
3327 spin_unlock_bh(&ifa->lock);
3328
3329 if (state != INET6_IFADDR_STATE_DEAD) {
3330 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3331 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3332 }
3333 in6_ifa_put(ifa);
3334
3335 write_lock_bh(&idev->lock);
3336 }
3337
3338 write_unlock_bh(&idev->lock);
3339
3340 /* Step 5: Discard anycast and multicast list */
3341 if (how) {
3342 ipv6_ac_destroy_dev(idev);
3343 ipv6_mc_destroy_dev(idev);
3344 } else {
3345 ipv6_mc_down(idev);
3346 }
3347
3348 idev->tstamp = jiffies;
3349
3350 /* Last: Shot the device (if unregistered) */
3351 if (how) {
3352 addrconf_sysctl_unregister(idev);
3353 neigh_parms_release(&nd_tbl, idev->nd_parms);
3354 neigh_ifdown(&nd_tbl, dev);
3355 in6_dev_put(idev);
3356 }
3357 return 0;
3358 }
3359
addrconf_rs_timer(unsigned long data)3360 static void addrconf_rs_timer(unsigned long data)
3361 {
3362 struct inet6_dev *idev = (struct inet6_dev *)data;
3363 struct net_device *dev = idev->dev;
3364 struct in6_addr lladdr;
3365
3366 write_lock(&idev->lock);
3367 if (idev->dead || !(idev->if_flags & IF_READY))
3368 goto out;
3369
3370 if (!ipv6_accept_ra(idev))
3371 goto out;
3372
3373 /* Announcement received after solicitation was sent */
3374 if (idev->if_flags & IF_RA_RCVD)
3375 goto out;
3376
3377 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3378 write_unlock(&idev->lock);
3379 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3380 ndisc_send_rs(dev, &lladdr,
3381 &in6addr_linklocal_allrouters);
3382 else
3383 goto put;
3384
3385 write_lock(&idev->lock);
3386 /* The wait after the last probe can be shorter */
3387 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3388 idev->cnf.rtr_solicits) ?
3389 idev->cnf.rtr_solicit_delay :
3390 idev->cnf.rtr_solicit_interval);
3391 } else {
3392 /*
3393 * Note: we do not support deprecated "all on-link"
3394 * assumption any longer.
3395 */
3396 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3397 }
3398
3399 out:
3400 write_unlock(&idev->lock);
3401 put:
3402 in6_dev_put(idev);
3403 }
3404
3405 /*
3406 * Duplicate Address Detection
3407 */
addrconf_dad_kick(struct inet6_ifaddr * ifp)3408 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3409 {
3410 unsigned long rand_num;
3411 struct inet6_dev *idev = ifp->idev;
3412
3413 if (ifp->flags & IFA_F_OPTIMISTIC)
3414 rand_num = 0;
3415 else
3416 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3417
3418 ifp->dad_probes = idev->cnf.dad_transmits;
3419 addrconf_mod_dad_work(ifp, rand_num);
3420 }
3421
addrconf_dad_begin(struct inet6_ifaddr * ifp)3422 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3423 {
3424 struct inet6_dev *idev = ifp->idev;
3425 struct net_device *dev = idev->dev;
3426 bool notify = false;
3427
3428 addrconf_join_solict(dev, &ifp->addr);
3429
3430 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3431
3432 read_lock_bh(&idev->lock);
3433 spin_lock(&ifp->lock);
3434 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3435 goto out;
3436
3437 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3438 idev->cnf.accept_dad < 1 ||
3439 !(ifp->flags&IFA_F_TENTATIVE) ||
3440 ifp->flags & IFA_F_NODAD) {
3441 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3442 spin_unlock(&ifp->lock);
3443 read_unlock_bh(&idev->lock);
3444
3445 addrconf_dad_completed(ifp);
3446 return;
3447 }
3448
3449 if (!(idev->if_flags & IF_READY)) {
3450 spin_unlock(&ifp->lock);
3451 read_unlock_bh(&idev->lock);
3452 /*
3453 * If the device is not ready:
3454 * - keep it tentative if it is a permanent address.
3455 * - otherwise, kill it.
3456 */
3457 in6_ifa_hold(ifp);
3458 addrconf_dad_stop(ifp, 0);
3459 return;
3460 }
3461
3462 /*
3463 * Optimistic nodes can start receiving
3464 * Frames right away
3465 */
3466 if (ifp->flags & IFA_F_OPTIMISTIC) {
3467 ip6_ins_rt(ifp->rt);
3468 if (ipv6_use_optimistic_addr(idev)) {
3469 /* Because optimistic nodes can use this address,
3470 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3471 */
3472 notify = true;
3473 }
3474 }
3475
3476 addrconf_dad_kick(ifp);
3477 out:
3478 spin_unlock(&ifp->lock);
3479 read_unlock_bh(&idev->lock);
3480 if (notify)
3481 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3482 }
3483
addrconf_dad_start(struct inet6_ifaddr * ifp)3484 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3485 {
3486 bool begin_dad = false;
3487
3488 spin_lock_bh(&ifp->lock);
3489 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3490 ifp->state = INET6_IFADDR_STATE_PREDAD;
3491 begin_dad = true;
3492 }
3493 spin_unlock_bh(&ifp->lock);
3494
3495 if (begin_dad)
3496 addrconf_mod_dad_work(ifp, 0);
3497 }
3498
addrconf_dad_work(struct work_struct * w)3499 static void addrconf_dad_work(struct work_struct *w)
3500 {
3501 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3502 struct inet6_ifaddr,
3503 dad_work);
3504 struct inet6_dev *idev = ifp->idev;
3505 struct in6_addr mcaddr;
3506
3507 enum {
3508 DAD_PROCESS,
3509 DAD_BEGIN,
3510 DAD_ABORT,
3511 } action = DAD_PROCESS;
3512
3513 rtnl_lock();
3514
3515 spin_lock_bh(&ifp->lock);
3516 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3517 action = DAD_BEGIN;
3518 ifp->state = INET6_IFADDR_STATE_DAD;
3519 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3520 action = DAD_ABORT;
3521 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3522 }
3523 spin_unlock_bh(&ifp->lock);
3524
3525 if (action == DAD_BEGIN) {
3526 addrconf_dad_begin(ifp);
3527 goto out;
3528 } else if (action == DAD_ABORT) {
3529 addrconf_dad_stop(ifp, 1);
3530 goto out;
3531 }
3532
3533 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3534 goto out;
3535
3536 write_lock_bh(&idev->lock);
3537 if (idev->dead || !(idev->if_flags & IF_READY)) {
3538 write_unlock_bh(&idev->lock);
3539 goto out;
3540 }
3541
3542 spin_lock(&ifp->lock);
3543 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3544 spin_unlock(&ifp->lock);
3545 write_unlock_bh(&idev->lock);
3546 goto out;
3547 }
3548
3549 if (ifp->dad_probes == 0) {
3550 /*
3551 * DAD was successful
3552 */
3553
3554 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3555 spin_unlock(&ifp->lock);
3556 write_unlock_bh(&idev->lock);
3557
3558 addrconf_dad_completed(ifp);
3559
3560 goto out;
3561 }
3562
3563 ifp->dad_probes--;
3564 addrconf_mod_dad_work(ifp,
3565 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3566 spin_unlock(&ifp->lock);
3567 write_unlock_bh(&idev->lock);
3568
3569 /* send a neighbour solicitation for our addr */
3570 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3571 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3572 out:
3573 in6_ifa_put(ifp);
3574 rtnl_unlock();
3575 }
3576
3577 /* ifp->idev must be at least read locked */
ipv6_lonely_lladdr(struct inet6_ifaddr * ifp)3578 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3579 {
3580 struct inet6_ifaddr *ifpiter;
3581 struct inet6_dev *idev = ifp->idev;
3582
3583 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3584 if (ifpiter->scope > IFA_LINK)
3585 break;
3586 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3587 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3588 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3589 IFA_F_PERMANENT)
3590 return false;
3591 }
3592 return true;
3593 }
3594
addrconf_dad_completed(struct inet6_ifaddr * ifp)3595 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3596 {
3597 struct net_device *dev = ifp->idev->dev;
3598 struct in6_addr lladdr;
3599 bool send_rs, send_mld;
3600
3601 addrconf_del_dad_work(ifp);
3602
3603 /*
3604 * Configure the address for reception. Now it is valid.
3605 */
3606
3607 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3608
3609 /* If added prefix is link local and we are prepared to process
3610 router advertisements, start sending router solicitations.
3611 */
3612
3613 read_lock_bh(&ifp->idev->lock);
3614 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3615 send_rs = send_mld &&
3616 ipv6_accept_ra(ifp->idev) &&
3617 ifp->idev->cnf.rtr_solicits > 0 &&
3618 (dev->flags&IFF_LOOPBACK) == 0;
3619 read_unlock_bh(&ifp->idev->lock);
3620
3621 /* While dad is in progress mld report's source address is in6_addrany.
3622 * Resend with proper ll now.
3623 */
3624 if (send_mld)
3625 ipv6_mc_dad_complete(ifp->idev);
3626
3627 if (send_rs) {
3628 /*
3629 * If a host as already performed a random delay
3630 * [...] as part of DAD [...] there is no need
3631 * to delay again before sending the first RS
3632 */
3633 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3634 return;
3635 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3636
3637 write_lock_bh(&ifp->idev->lock);
3638 spin_lock(&ifp->lock);
3639 ifp->idev->rs_probes = 1;
3640 ifp->idev->if_flags |= IF_RS_SENT;
3641 addrconf_mod_rs_timer(ifp->idev,
3642 ifp->idev->cnf.rtr_solicit_interval);
3643 spin_unlock(&ifp->lock);
3644 write_unlock_bh(&ifp->idev->lock);
3645 }
3646 }
3647
addrconf_dad_run(struct inet6_dev * idev)3648 static void addrconf_dad_run(struct inet6_dev *idev)
3649 {
3650 struct inet6_ifaddr *ifp;
3651
3652 read_lock_bh(&idev->lock);
3653 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3654 spin_lock(&ifp->lock);
3655 if (ifp->flags & IFA_F_TENTATIVE &&
3656 ifp->state == INET6_IFADDR_STATE_DAD)
3657 addrconf_dad_kick(ifp);
3658 spin_unlock(&ifp->lock);
3659 }
3660 read_unlock_bh(&idev->lock);
3661 }
3662
3663 #ifdef CONFIG_PROC_FS
3664 struct if6_iter_state {
3665 struct seq_net_private p;
3666 int bucket;
3667 int offset;
3668 };
3669
if6_get_first(struct seq_file * seq,loff_t pos)3670 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3671 {
3672 struct inet6_ifaddr *ifa = NULL;
3673 struct if6_iter_state *state = seq->private;
3674 struct net *net = seq_file_net(seq);
3675 int p = 0;
3676
3677 /* initial bucket if pos is 0 */
3678 if (pos == 0) {
3679 state->bucket = 0;
3680 state->offset = 0;
3681 }
3682
3683 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3684 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3685 addr_lst) {
3686 if (!net_eq(dev_net(ifa->idev->dev), net))
3687 continue;
3688 /* sync with offset */
3689 if (p < state->offset) {
3690 p++;
3691 continue;
3692 }
3693 state->offset++;
3694 return ifa;
3695 }
3696
3697 /* prepare for next bucket */
3698 state->offset = 0;
3699 p = 0;
3700 }
3701 return NULL;
3702 }
3703
if6_get_next(struct seq_file * seq,struct inet6_ifaddr * ifa)3704 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3705 struct inet6_ifaddr *ifa)
3706 {
3707 struct if6_iter_state *state = seq->private;
3708 struct net *net = seq_file_net(seq);
3709
3710 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3711 if (!net_eq(dev_net(ifa->idev->dev), net))
3712 continue;
3713 state->offset++;
3714 return ifa;
3715 }
3716
3717 while (++state->bucket < IN6_ADDR_HSIZE) {
3718 state->offset = 0;
3719 hlist_for_each_entry_rcu_bh(ifa,
3720 &inet6_addr_lst[state->bucket], addr_lst) {
3721 if (!net_eq(dev_net(ifa->idev->dev), net))
3722 continue;
3723 state->offset++;
3724 return ifa;
3725 }
3726 }
3727
3728 return NULL;
3729 }
3730
if6_seq_start(struct seq_file * seq,loff_t * pos)3731 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3732 __acquires(rcu_bh)
3733 {
3734 rcu_read_lock_bh();
3735 return if6_get_first(seq, *pos);
3736 }
3737
if6_seq_next(struct seq_file * seq,void * v,loff_t * pos)3738 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3739 {
3740 struct inet6_ifaddr *ifa;
3741
3742 ifa = if6_get_next(seq, v);
3743 ++*pos;
3744 return ifa;
3745 }
3746
if6_seq_stop(struct seq_file * seq,void * v)3747 static void if6_seq_stop(struct seq_file *seq, void *v)
3748 __releases(rcu_bh)
3749 {
3750 rcu_read_unlock_bh();
3751 }
3752
if6_seq_show(struct seq_file * seq,void * v)3753 static int if6_seq_show(struct seq_file *seq, void *v)
3754 {
3755 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3756 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3757 &ifp->addr,
3758 ifp->idev->dev->ifindex,
3759 ifp->prefix_len,
3760 ifp->scope,
3761 (u8) ifp->flags,
3762 ifp->idev->dev->name);
3763 return 0;
3764 }
3765
3766 static const struct seq_operations if6_seq_ops = {
3767 .start = if6_seq_start,
3768 .next = if6_seq_next,
3769 .show = if6_seq_show,
3770 .stop = if6_seq_stop,
3771 };
3772
if6_seq_open(struct inode * inode,struct file * file)3773 static int if6_seq_open(struct inode *inode, struct file *file)
3774 {
3775 return seq_open_net(inode, file, &if6_seq_ops,
3776 sizeof(struct if6_iter_state));
3777 }
3778
3779 static const struct file_operations if6_fops = {
3780 .owner = THIS_MODULE,
3781 .open = if6_seq_open,
3782 .read = seq_read,
3783 .llseek = seq_lseek,
3784 .release = seq_release_net,
3785 };
3786
if6_proc_net_init(struct net * net)3787 static int __net_init if6_proc_net_init(struct net *net)
3788 {
3789 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3790 return -ENOMEM;
3791 return 0;
3792 }
3793
if6_proc_net_exit(struct net * net)3794 static void __net_exit if6_proc_net_exit(struct net *net)
3795 {
3796 remove_proc_entry("if_inet6", net->proc_net);
3797 }
3798
3799 static struct pernet_operations if6_proc_net_ops = {
3800 .init = if6_proc_net_init,
3801 .exit = if6_proc_net_exit,
3802 };
3803
if6_proc_init(void)3804 int __init if6_proc_init(void)
3805 {
3806 return register_pernet_subsys(&if6_proc_net_ops);
3807 }
3808
if6_proc_exit(void)3809 void if6_proc_exit(void)
3810 {
3811 unregister_pernet_subsys(&if6_proc_net_ops);
3812 }
3813 #endif /* CONFIG_PROC_FS */
3814
3815 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3816 /* Check if address is a home address configured on any interface. */
ipv6_chk_home_addr(struct net * net,const struct in6_addr * addr)3817 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3818 {
3819 int ret = 0;
3820 struct inet6_ifaddr *ifp = NULL;
3821 unsigned int hash = inet6_addr_hash(addr);
3822
3823 rcu_read_lock_bh();
3824 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3825 if (!net_eq(dev_net(ifp->idev->dev), net))
3826 continue;
3827 if (ipv6_addr_equal(&ifp->addr, addr) &&
3828 (ifp->flags & IFA_F_HOMEADDRESS)) {
3829 ret = 1;
3830 break;
3831 }
3832 }
3833 rcu_read_unlock_bh();
3834 return ret;
3835 }
3836 #endif
3837
3838 /*
3839 * Periodic address status verification
3840 */
3841
addrconf_verify_rtnl(void)3842 static void addrconf_verify_rtnl(void)
3843 {
3844 unsigned long now, next, next_sec, next_sched;
3845 struct inet6_ifaddr *ifp;
3846 int i;
3847
3848 ASSERT_RTNL();
3849
3850 rcu_read_lock_bh();
3851 now = jiffies;
3852 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3853
3854 cancel_delayed_work(&addr_chk_work);
3855
3856 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3857 restart:
3858 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3859 unsigned long age;
3860
3861 /* When setting preferred_lft to a value not zero or
3862 * infinity, while valid_lft is infinity
3863 * IFA_F_PERMANENT has a non-infinity life time.
3864 */
3865 if ((ifp->flags & IFA_F_PERMANENT) &&
3866 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3867 continue;
3868
3869 spin_lock(&ifp->lock);
3870 /* We try to batch several events at once. */
3871 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3872
3873 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3874 age >= ifp->valid_lft) {
3875 spin_unlock(&ifp->lock);
3876 in6_ifa_hold(ifp);
3877 ipv6_del_addr(ifp);
3878 goto restart;
3879 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3880 spin_unlock(&ifp->lock);
3881 continue;
3882 } else if (age >= ifp->prefered_lft) {
3883 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3884 int deprecate = 0;
3885
3886 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3887 deprecate = 1;
3888 ifp->flags |= IFA_F_DEPRECATED;
3889 }
3890
3891 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3892 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3893 next = ifp->tstamp + ifp->valid_lft * HZ;
3894
3895 spin_unlock(&ifp->lock);
3896
3897 if (deprecate) {
3898 in6_ifa_hold(ifp);
3899
3900 ipv6_ifa_notify(0, ifp);
3901 in6_ifa_put(ifp);
3902 goto restart;
3903 }
3904 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3905 !(ifp->flags&IFA_F_TENTATIVE)) {
3906 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3907 ifp->idev->cnf.dad_transmits *
3908 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3909
3910 if (age >= ifp->prefered_lft - regen_advance) {
3911 struct inet6_ifaddr *ifpub = ifp->ifpub;
3912 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3913 next = ifp->tstamp + ifp->prefered_lft * HZ;
3914 if (!ifp->regen_count && ifpub) {
3915 ifp->regen_count++;
3916 in6_ifa_hold(ifp);
3917 in6_ifa_hold(ifpub);
3918 spin_unlock(&ifp->lock);
3919
3920 spin_lock(&ifpub->lock);
3921 ifpub->regen_count = 0;
3922 spin_unlock(&ifpub->lock);
3923 ipv6_create_tempaddr(ifpub, ifp);
3924 in6_ifa_put(ifpub);
3925 in6_ifa_put(ifp);
3926 goto restart;
3927 }
3928 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3929 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3930 spin_unlock(&ifp->lock);
3931 } else {
3932 /* ifp->prefered_lft <= ifp->valid_lft */
3933 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3934 next = ifp->tstamp + ifp->prefered_lft * HZ;
3935 spin_unlock(&ifp->lock);
3936 }
3937 }
3938 }
3939
3940 next_sec = round_jiffies_up(next);
3941 next_sched = next;
3942
3943 /* If rounded timeout is accurate enough, accept it. */
3944 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3945 next_sched = next_sec;
3946
3947 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3948 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3949 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3950
3951 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3952 now, next, next_sec, next_sched);
3953 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
3954 rcu_read_unlock_bh();
3955 }
3956
addrconf_verify_work(struct work_struct * w)3957 static void addrconf_verify_work(struct work_struct *w)
3958 {
3959 rtnl_lock();
3960 addrconf_verify_rtnl();
3961 rtnl_unlock();
3962 }
3963
addrconf_verify(void)3964 static void addrconf_verify(void)
3965 {
3966 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
3967 }
3968
extract_addr(struct nlattr * addr,struct nlattr * local,struct in6_addr ** peer_pfx)3969 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
3970 struct in6_addr **peer_pfx)
3971 {
3972 struct in6_addr *pfx = NULL;
3973
3974 *peer_pfx = NULL;
3975
3976 if (addr)
3977 pfx = nla_data(addr);
3978
3979 if (local) {
3980 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3981 *peer_pfx = pfx;
3982 pfx = nla_data(local);
3983 }
3984
3985 return pfx;
3986 }
3987
3988 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3989 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3990 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3991 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3992 [IFA_FLAGS] = { .len = sizeof(u32) },
3993 };
3994
3995 static int
inet6_rtm_deladdr(struct sk_buff * skb,struct nlmsghdr * nlh)3996 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3997 {
3998 struct net *net = sock_net(skb->sk);
3999 struct ifaddrmsg *ifm;
4000 struct nlattr *tb[IFA_MAX+1];
4001 struct in6_addr *pfx, *peer_pfx;
4002 u32 ifa_flags;
4003 int err;
4004
4005 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4006 if (err < 0)
4007 return err;
4008
4009 ifm = nlmsg_data(nlh);
4010 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4011 if (!pfx)
4012 return -EINVAL;
4013
4014 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4015
4016 /* We ignore other flags so far. */
4017 ifa_flags &= IFA_F_MANAGETEMPADDR;
4018
4019 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4020 ifm->ifa_prefixlen);
4021 }
4022
inet6_addr_modify(struct inet6_ifaddr * ifp,u32 ifa_flags,u32 prefered_lft,u32 valid_lft)4023 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4024 u32 prefered_lft, u32 valid_lft)
4025 {
4026 u32 flags;
4027 clock_t expires;
4028 unsigned long timeout;
4029 bool was_managetempaddr;
4030 bool had_prefixroute;
4031
4032 ASSERT_RTNL();
4033
4034 if (!valid_lft || (prefered_lft > valid_lft))
4035 return -EINVAL;
4036
4037 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4038 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4039 return -EINVAL;
4040
4041 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4042 if (addrconf_finite_timeout(timeout)) {
4043 expires = jiffies_to_clock_t(timeout * HZ);
4044 valid_lft = timeout;
4045 flags = RTF_EXPIRES;
4046 } else {
4047 expires = 0;
4048 flags = 0;
4049 ifa_flags |= IFA_F_PERMANENT;
4050 }
4051
4052 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4053 if (addrconf_finite_timeout(timeout)) {
4054 if (timeout == 0)
4055 ifa_flags |= IFA_F_DEPRECATED;
4056 prefered_lft = timeout;
4057 }
4058
4059 spin_lock_bh(&ifp->lock);
4060 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4061 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4062 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4063 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4064 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4065 IFA_F_NOPREFIXROUTE);
4066 ifp->flags |= ifa_flags;
4067 ifp->tstamp = jiffies;
4068 ifp->valid_lft = valid_lft;
4069 ifp->prefered_lft = prefered_lft;
4070
4071 spin_unlock_bh(&ifp->lock);
4072 if (!(ifp->flags&IFA_F_TENTATIVE))
4073 ipv6_ifa_notify(0, ifp);
4074
4075 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4076 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4077 expires, flags);
4078 } else if (had_prefixroute) {
4079 enum cleanup_prefix_rt_t action;
4080 unsigned long rt_expires;
4081
4082 write_lock_bh(&ifp->idev->lock);
4083 action = check_cleanup_prefix_route(ifp, &rt_expires);
4084 write_unlock_bh(&ifp->idev->lock);
4085
4086 if (action != CLEANUP_PREFIX_RT_NOP) {
4087 cleanup_prefix_route(ifp, rt_expires,
4088 action == CLEANUP_PREFIX_RT_DEL);
4089 }
4090 }
4091
4092 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4093 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4094 valid_lft = prefered_lft = 0;
4095 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4096 !was_managetempaddr, jiffies);
4097 }
4098
4099 addrconf_verify_rtnl();
4100
4101 return 0;
4102 }
4103
4104 static int
inet6_rtm_newaddr(struct sk_buff * skb,struct nlmsghdr * nlh)4105 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4106 {
4107 struct net *net = sock_net(skb->sk);
4108 struct ifaddrmsg *ifm;
4109 struct nlattr *tb[IFA_MAX+1];
4110 struct in6_addr *pfx, *peer_pfx;
4111 struct inet6_ifaddr *ifa;
4112 struct net_device *dev;
4113 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4114 u32 ifa_flags;
4115 int err;
4116
4117 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4118 if (err < 0)
4119 return err;
4120
4121 ifm = nlmsg_data(nlh);
4122 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4123 if (!pfx)
4124 return -EINVAL;
4125
4126 if (tb[IFA_CACHEINFO]) {
4127 struct ifa_cacheinfo *ci;
4128
4129 ci = nla_data(tb[IFA_CACHEINFO]);
4130 valid_lft = ci->ifa_valid;
4131 preferred_lft = ci->ifa_prefered;
4132 } else {
4133 preferred_lft = INFINITY_LIFE_TIME;
4134 valid_lft = INFINITY_LIFE_TIME;
4135 }
4136
4137 dev = __dev_get_by_index(net, ifm->ifa_index);
4138 if (!dev)
4139 return -ENODEV;
4140
4141 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4142
4143 /* We ignore other flags so far. */
4144 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4145 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4146
4147 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4148 if (!ifa) {
4149 /*
4150 * It would be best to check for !NLM_F_CREATE here but
4151 * userspace already relies on not having to provide this.
4152 */
4153 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4154 ifm->ifa_prefixlen, ifa_flags,
4155 preferred_lft, valid_lft);
4156 }
4157
4158 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4159 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4160 err = -EEXIST;
4161 else
4162 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4163
4164 in6_ifa_put(ifa);
4165
4166 return err;
4167 }
4168
put_ifaddrmsg(struct nlmsghdr * nlh,u8 prefixlen,u32 flags,u8 scope,int ifindex)4169 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4170 u8 scope, int ifindex)
4171 {
4172 struct ifaddrmsg *ifm;
4173
4174 ifm = nlmsg_data(nlh);
4175 ifm->ifa_family = AF_INET6;
4176 ifm->ifa_prefixlen = prefixlen;
4177 ifm->ifa_flags = flags;
4178 ifm->ifa_scope = scope;
4179 ifm->ifa_index = ifindex;
4180 }
4181
put_cacheinfo(struct sk_buff * skb,unsigned long cstamp,unsigned long tstamp,u32 preferred,u32 valid)4182 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4183 unsigned long tstamp, u32 preferred, u32 valid)
4184 {
4185 struct ifa_cacheinfo ci;
4186
4187 ci.cstamp = cstamp_delta(cstamp);
4188 ci.tstamp = cstamp_delta(tstamp);
4189 ci.ifa_prefered = preferred;
4190 ci.ifa_valid = valid;
4191
4192 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4193 }
4194
rt_scope(int ifa_scope)4195 static inline int rt_scope(int ifa_scope)
4196 {
4197 if (ifa_scope & IFA_HOST)
4198 return RT_SCOPE_HOST;
4199 else if (ifa_scope & IFA_LINK)
4200 return RT_SCOPE_LINK;
4201 else if (ifa_scope & IFA_SITE)
4202 return RT_SCOPE_SITE;
4203 else
4204 return RT_SCOPE_UNIVERSE;
4205 }
4206
inet6_ifaddr_msgsize(void)4207 static inline int inet6_ifaddr_msgsize(void)
4208 {
4209 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4210 + nla_total_size(16) /* IFA_LOCAL */
4211 + nla_total_size(16) /* IFA_ADDRESS */
4212 + nla_total_size(sizeof(struct ifa_cacheinfo))
4213 + nla_total_size(4) /* IFA_FLAGS */;
4214 }
4215
inet6_fill_ifaddr(struct sk_buff * skb,struct inet6_ifaddr * ifa,u32 portid,u32 seq,int event,unsigned int flags)4216 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4217 u32 portid, u32 seq, int event, unsigned int flags)
4218 {
4219 struct nlmsghdr *nlh;
4220 u32 preferred, valid;
4221
4222 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4223 if (!nlh)
4224 return -EMSGSIZE;
4225
4226 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4227 ifa->idev->dev->ifindex);
4228
4229 if (!((ifa->flags&IFA_F_PERMANENT) &&
4230 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4231 preferred = ifa->prefered_lft;
4232 valid = ifa->valid_lft;
4233 if (preferred != INFINITY_LIFE_TIME) {
4234 long tval = (jiffies - ifa->tstamp)/HZ;
4235 if (preferred > tval)
4236 preferred -= tval;
4237 else
4238 preferred = 0;
4239 if (valid != INFINITY_LIFE_TIME) {
4240 if (valid > tval)
4241 valid -= tval;
4242 else
4243 valid = 0;
4244 }
4245 }
4246 } else {
4247 preferred = INFINITY_LIFE_TIME;
4248 valid = INFINITY_LIFE_TIME;
4249 }
4250
4251 if (!ipv6_addr_any(&ifa->peer_addr)) {
4252 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4253 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4254 goto error;
4255 } else
4256 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4257 goto error;
4258
4259 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4260 goto error;
4261
4262 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4263 goto error;
4264
4265 nlmsg_end(skb, nlh);
4266 return 0;
4267
4268 error:
4269 nlmsg_cancel(skb, nlh);
4270 return -EMSGSIZE;
4271 }
4272
inet6_fill_ifmcaddr(struct sk_buff * skb,struct ifmcaddr6 * ifmca,u32 portid,u32 seq,int event,u16 flags)4273 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4274 u32 portid, u32 seq, int event, u16 flags)
4275 {
4276 struct nlmsghdr *nlh;
4277 u8 scope = RT_SCOPE_UNIVERSE;
4278 int ifindex = ifmca->idev->dev->ifindex;
4279
4280 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4281 scope = RT_SCOPE_SITE;
4282
4283 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4284 if (!nlh)
4285 return -EMSGSIZE;
4286
4287 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4288 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4289 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4290 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4291 nlmsg_cancel(skb, nlh);
4292 return -EMSGSIZE;
4293 }
4294
4295 nlmsg_end(skb, nlh);
4296 return 0;
4297 }
4298
inet6_fill_ifacaddr(struct sk_buff * skb,struct ifacaddr6 * ifaca,u32 portid,u32 seq,int event,unsigned int flags)4299 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4300 u32 portid, u32 seq, int event, unsigned int flags)
4301 {
4302 struct nlmsghdr *nlh;
4303 u8 scope = RT_SCOPE_UNIVERSE;
4304 int ifindex = ifaca->aca_idev->dev->ifindex;
4305
4306 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4307 scope = RT_SCOPE_SITE;
4308
4309 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4310 if (!nlh)
4311 return -EMSGSIZE;
4312
4313 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4314 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4315 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4316 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4317 nlmsg_cancel(skb, nlh);
4318 return -EMSGSIZE;
4319 }
4320
4321 nlmsg_end(skb, nlh);
4322 return 0;
4323 }
4324
4325 enum addr_type_t {
4326 UNICAST_ADDR,
4327 MULTICAST_ADDR,
4328 ANYCAST_ADDR,
4329 };
4330
4331 /* called with rcu_read_lock() */
in6_dump_addrs(struct inet6_dev * idev,struct sk_buff * skb,struct netlink_callback * cb,enum addr_type_t type,int s_ip_idx,int * p_ip_idx)4332 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4333 struct netlink_callback *cb, enum addr_type_t type,
4334 int s_ip_idx, int *p_ip_idx)
4335 {
4336 struct ifmcaddr6 *ifmca;
4337 struct ifacaddr6 *ifaca;
4338 int err = 1;
4339 int ip_idx = *p_ip_idx;
4340
4341 read_lock_bh(&idev->lock);
4342 switch (type) {
4343 case UNICAST_ADDR: {
4344 struct inet6_ifaddr *ifa;
4345
4346 /* unicast address incl. temp addr */
4347 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4348 if (++ip_idx < s_ip_idx)
4349 continue;
4350 err = inet6_fill_ifaddr(skb, ifa,
4351 NETLINK_CB(cb->skb).portid,
4352 cb->nlh->nlmsg_seq,
4353 RTM_NEWADDR,
4354 NLM_F_MULTI);
4355 if (err < 0)
4356 break;
4357 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4358 }
4359 break;
4360 }
4361 case MULTICAST_ADDR:
4362 /* multicast address */
4363 for (ifmca = idev->mc_list; ifmca;
4364 ifmca = ifmca->next, ip_idx++) {
4365 if (ip_idx < s_ip_idx)
4366 continue;
4367 err = inet6_fill_ifmcaddr(skb, ifmca,
4368 NETLINK_CB(cb->skb).portid,
4369 cb->nlh->nlmsg_seq,
4370 RTM_GETMULTICAST,
4371 NLM_F_MULTI);
4372 if (err < 0)
4373 break;
4374 }
4375 break;
4376 case ANYCAST_ADDR:
4377 /* anycast address */
4378 for (ifaca = idev->ac_list; ifaca;
4379 ifaca = ifaca->aca_next, ip_idx++) {
4380 if (ip_idx < s_ip_idx)
4381 continue;
4382 err = inet6_fill_ifacaddr(skb, ifaca,
4383 NETLINK_CB(cb->skb).portid,
4384 cb->nlh->nlmsg_seq,
4385 RTM_GETANYCAST,
4386 NLM_F_MULTI);
4387 if (err < 0)
4388 break;
4389 }
4390 break;
4391 default:
4392 break;
4393 }
4394 read_unlock_bh(&idev->lock);
4395 *p_ip_idx = ip_idx;
4396 return err;
4397 }
4398
inet6_dump_addr(struct sk_buff * skb,struct netlink_callback * cb,enum addr_type_t type)4399 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4400 enum addr_type_t type)
4401 {
4402 struct net *net = sock_net(skb->sk);
4403 int h, s_h;
4404 int idx, ip_idx;
4405 int s_idx, s_ip_idx;
4406 struct net_device *dev;
4407 struct inet6_dev *idev;
4408 struct hlist_head *head;
4409
4410 s_h = cb->args[0];
4411 s_idx = idx = cb->args[1];
4412 s_ip_idx = ip_idx = cb->args[2];
4413
4414 rcu_read_lock();
4415 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4416 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4417 idx = 0;
4418 head = &net->dev_index_head[h];
4419 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4420 if (idx < s_idx)
4421 goto cont;
4422 if (h > s_h || idx > s_idx)
4423 s_ip_idx = 0;
4424 ip_idx = 0;
4425 idev = __in6_dev_get(dev);
4426 if (!idev)
4427 goto cont;
4428
4429 if (in6_dump_addrs(idev, skb, cb, type,
4430 s_ip_idx, &ip_idx) < 0)
4431 goto done;
4432 cont:
4433 idx++;
4434 }
4435 }
4436 done:
4437 rcu_read_unlock();
4438 cb->args[0] = h;
4439 cb->args[1] = idx;
4440 cb->args[2] = ip_idx;
4441
4442 return skb->len;
4443 }
4444
inet6_dump_ifaddr(struct sk_buff * skb,struct netlink_callback * cb)4445 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4446 {
4447 enum addr_type_t type = UNICAST_ADDR;
4448
4449 return inet6_dump_addr(skb, cb, type);
4450 }
4451
inet6_dump_ifmcaddr(struct sk_buff * skb,struct netlink_callback * cb)4452 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4453 {
4454 enum addr_type_t type = MULTICAST_ADDR;
4455
4456 return inet6_dump_addr(skb, cb, type);
4457 }
4458
4459
inet6_dump_ifacaddr(struct sk_buff * skb,struct netlink_callback * cb)4460 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4461 {
4462 enum addr_type_t type = ANYCAST_ADDR;
4463
4464 return inet6_dump_addr(skb, cb, type);
4465 }
4466
inet6_rtm_getaddr(struct sk_buff * in_skb,struct nlmsghdr * nlh)4467 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4468 {
4469 struct net *net = sock_net(in_skb->sk);
4470 struct ifaddrmsg *ifm;
4471 struct nlattr *tb[IFA_MAX+1];
4472 struct in6_addr *addr = NULL, *peer;
4473 struct net_device *dev = NULL;
4474 struct inet6_ifaddr *ifa;
4475 struct sk_buff *skb;
4476 int err;
4477
4478 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4479 if (err < 0)
4480 goto errout;
4481
4482 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4483 if (!addr) {
4484 err = -EINVAL;
4485 goto errout;
4486 }
4487
4488 ifm = nlmsg_data(nlh);
4489 if (ifm->ifa_index)
4490 dev = __dev_get_by_index(net, ifm->ifa_index);
4491
4492 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4493 if (!ifa) {
4494 err = -EADDRNOTAVAIL;
4495 goto errout;
4496 }
4497
4498 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4499 if (!skb) {
4500 err = -ENOBUFS;
4501 goto errout_ifa;
4502 }
4503
4504 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4505 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4506 if (err < 0) {
4507 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4508 WARN_ON(err == -EMSGSIZE);
4509 kfree_skb(skb);
4510 goto errout_ifa;
4511 }
4512 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4513 errout_ifa:
4514 in6_ifa_put(ifa);
4515 errout:
4516 return err;
4517 }
4518
inet6_ifa_notify(int event,struct inet6_ifaddr * ifa)4519 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4520 {
4521 struct sk_buff *skb;
4522 struct net *net = dev_net(ifa->idev->dev);
4523 int err = -ENOBUFS;
4524
4525 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4526 if (!skb)
4527 goto errout;
4528
4529 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4530 if (err < 0) {
4531 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4532 WARN_ON(err == -EMSGSIZE);
4533 kfree_skb(skb);
4534 goto errout;
4535 }
4536 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4537 return;
4538 errout:
4539 if (err < 0)
4540 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4541 }
4542
ipv6_store_devconf(struct ipv6_devconf * cnf,__s32 * array,int bytes)4543 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4544 __s32 *array, int bytes)
4545 {
4546 BUG_ON(bytes < (DEVCONF_MAX * 4));
4547
4548 memset(array, 0, bytes);
4549 array[DEVCONF_FORWARDING] = cnf->forwarding;
4550 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4551 array[DEVCONF_MTU6] = cnf->mtu6;
4552 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4553 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4554 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4555 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4556 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4557 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4558 jiffies_to_msecs(cnf->rtr_solicit_interval);
4559 array[DEVCONF_RTR_SOLICIT_DELAY] =
4560 jiffies_to_msecs(cnf->rtr_solicit_delay);
4561 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4562 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4563 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4564 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4565 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4566 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4567 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4568 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4569 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4570 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4571 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4572 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4573 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4574 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4575 #ifdef CONFIG_IPV6_ROUTER_PREF
4576 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4577 array[DEVCONF_RTR_PROBE_INTERVAL] =
4578 jiffies_to_msecs(cnf->rtr_probe_interval);
4579 #ifdef CONFIG_IPV6_ROUTE_INFO
4580 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4581 #endif
4582 #endif
4583 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4584 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4585 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4586 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4587 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4588 #endif
4589 #ifdef CONFIG_IPV6_MROUTE
4590 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4591 #endif
4592 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4593 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4594 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4595 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4596 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4597 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4598 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4599 /* we omit DEVCONF_STABLE_SECRET for now */
4600 }
4601
inet6_ifla6_size(void)4602 static inline size_t inet6_ifla6_size(void)
4603 {
4604 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4605 + nla_total_size(sizeof(struct ifla_cacheinfo))
4606 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4607 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4608 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4609 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4610 }
4611
inet6_if_nlmsg_size(void)4612 static inline size_t inet6_if_nlmsg_size(void)
4613 {
4614 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4615 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4616 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4617 + nla_total_size(4) /* IFLA_MTU */
4618 + nla_total_size(4) /* IFLA_LINK */
4619 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4620 }
4621
__snmp6_fill_statsdev(u64 * stats,atomic_long_t * mib,int items,int bytes)4622 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4623 int items, int bytes)
4624 {
4625 int i;
4626 int pad = bytes - sizeof(u64) * items;
4627 BUG_ON(pad < 0);
4628
4629 /* Use put_unaligned() because stats may not be aligned for u64. */
4630 put_unaligned(items, &stats[0]);
4631 for (i = 1; i < items; i++)
4632 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4633
4634 memset(&stats[items], 0, pad);
4635 }
4636
__snmp6_fill_stats64(u64 * stats,void __percpu * mib,int items,int bytes,size_t syncpoff)4637 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4638 int items, int bytes, size_t syncpoff)
4639 {
4640 int i;
4641 int pad = bytes - sizeof(u64) * items;
4642 BUG_ON(pad < 0);
4643
4644 /* Use put_unaligned() because stats may not be aligned for u64. */
4645 put_unaligned(items, &stats[0]);
4646 for (i = 1; i < items; i++)
4647 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4648
4649 memset(&stats[items], 0, pad);
4650 }
4651
snmp6_fill_stats(u64 * stats,struct inet6_dev * idev,int attrtype,int bytes)4652 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4653 int bytes)
4654 {
4655 switch (attrtype) {
4656 case IFLA_INET6_STATS:
4657 __snmp6_fill_stats64(stats, idev->stats.ipv6,
4658 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4659 break;
4660 case IFLA_INET6_ICMP6STATS:
4661 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4662 break;
4663 }
4664 }
4665
inet6_fill_ifla6_attrs(struct sk_buff * skb,struct inet6_dev * idev)4666 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4667 {
4668 struct nlattr *nla;
4669 struct ifla_cacheinfo ci;
4670
4671 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4672 goto nla_put_failure;
4673 ci.max_reasm_len = IPV6_MAXPLEN;
4674 ci.tstamp = cstamp_delta(idev->tstamp);
4675 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4676 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4677 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4678 goto nla_put_failure;
4679 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4680 if (!nla)
4681 goto nla_put_failure;
4682 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4683
4684 /* XXX - MC not implemented */
4685
4686 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4687 if (!nla)
4688 goto nla_put_failure;
4689 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4690
4691 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4692 if (!nla)
4693 goto nla_put_failure;
4694 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4695
4696 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4697 if (!nla)
4698 goto nla_put_failure;
4699
4700 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4701 goto nla_put_failure;
4702
4703 read_lock_bh(&idev->lock);
4704 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4705 read_unlock_bh(&idev->lock);
4706
4707 return 0;
4708
4709 nla_put_failure:
4710 return -EMSGSIZE;
4711 }
4712
inet6_get_link_af_size(const struct net_device * dev)4713 static size_t inet6_get_link_af_size(const struct net_device *dev)
4714 {
4715 if (!__in6_dev_get(dev))
4716 return 0;
4717
4718 return inet6_ifla6_size();
4719 }
4720
inet6_fill_link_af(struct sk_buff * skb,const struct net_device * dev)4721 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4722 {
4723 struct inet6_dev *idev = __in6_dev_get(dev);
4724
4725 if (!idev)
4726 return -ENODATA;
4727
4728 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4729 return -EMSGSIZE;
4730
4731 return 0;
4732 }
4733
inet6_set_iftoken(struct inet6_dev * idev,struct in6_addr * token)4734 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4735 {
4736 struct inet6_ifaddr *ifp;
4737 struct net_device *dev = idev->dev;
4738 bool update_rs = false;
4739 struct in6_addr ll_addr;
4740
4741 ASSERT_RTNL();
4742
4743 if (!token)
4744 return -EINVAL;
4745 if (ipv6_addr_any(token))
4746 return -EINVAL;
4747 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4748 return -EINVAL;
4749 if (!ipv6_accept_ra(idev))
4750 return -EINVAL;
4751 if (idev->cnf.rtr_solicits <= 0)
4752 return -EINVAL;
4753
4754 write_lock_bh(&idev->lock);
4755
4756 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4757 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4758
4759 write_unlock_bh(&idev->lock);
4760
4761 if (!idev->dead && (idev->if_flags & IF_READY) &&
4762 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4763 IFA_F_OPTIMISTIC)) {
4764
4765 /* If we're not ready, then normal ifup will take care
4766 * of this. Otherwise, we need to request our rs here.
4767 */
4768 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4769 update_rs = true;
4770 }
4771
4772 write_lock_bh(&idev->lock);
4773
4774 if (update_rs) {
4775 idev->if_flags |= IF_RS_SENT;
4776 idev->rs_probes = 1;
4777 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4778 }
4779
4780 /* Well, that's kinda nasty ... */
4781 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4782 spin_lock(&ifp->lock);
4783 if (ifp->tokenized) {
4784 ifp->valid_lft = 0;
4785 ifp->prefered_lft = 0;
4786 }
4787 spin_unlock(&ifp->lock);
4788 }
4789
4790 write_unlock_bh(&idev->lock);
4791 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4792 addrconf_verify_rtnl();
4793 return 0;
4794 }
4795
4796 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4797 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4798 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4799 };
4800
inet6_validate_link_af(const struct net_device * dev,const struct nlattr * nla)4801 static int inet6_validate_link_af(const struct net_device *dev,
4802 const struct nlattr *nla)
4803 {
4804 struct nlattr *tb[IFLA_INET6_MAX + 1];
4805
4806 if (dev && !__in6_dev_get(dev))
4807 return -EAFNOSUPPORT;
4808
4809 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4810 }
4811
inet6_set_link_af(struct net_device * dev,const struct nlattr * nla)4812 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4813 {
4814 int err = -EINVAL;
4815 struct inet6_dev *idev = __in6_dev_get(dev);
4816 struct nlattr *tb[IFLA_INET6_MAX + 1];
4817
4818 if (!idev)
4819 return -EAFNOSUPPORT;
4820
4821 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4822 BUG();
4823
4824 if (tb[IFLA_INET6_TOKEN]) {
4825 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4826 if (err)
4827 return err;
4828 }
4829
4830 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4831 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4832
4833 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4834 mode != IN6_ADDR_GEN_MODE_NONE &&
4835 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4836 return -EINVAL;
4837
4838 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4839 !idev->cnf.stable_secret.initialized &&
4840 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4841 return -EINVAL;
4842
4843 idev->addr_gen_mode = mode;
4844 err = 0;
4845 }
4846
4847 return err;
4848 }
4849
inet6_fill_ifinfo(struct sk_buff * skb,struct inet6_dev * idev,u32 portid,u32 seq,int event,unsigned int flags)4850 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4851 u32 portid, u32 seq, int event, unsigned int flags)
4852 {
4853 struct net_device *dev = idev->dev;
4854 struct ifinfomsg *hdr;
4855 struct nlmsghdr *nlh;
4856 void *protoinfo;
4857
4858 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4859 if (!nlh)
4860 return -EMSGSIZE;
4861
4862 hdr = nlmsg_data(nlh);
4863 hdr->ifi_family = AF_INET6;
4864 hdr->__ifi_pad = 0;
4865 hdr->ifi_type = dev->type;
4866 hdr->ifi_index = dev->ifindex;
4867 hdr->ifi_flags = dev_get_flags(dev);
4868 hdr->ifi_change = 0;
4869
4870 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4871 (dev->addr_len &&
4872 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4873 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4874 (dev->ifindex != dev_get_iflink(dev) &&
4875 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))))
4876 goto nla_put_failure;
4877 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4878 if (!protoinfo)
4879 goto nla_put_failure;
4880
4881 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4882 goto nla_put_failure;
4883
4884 nla_nest_end(skb, protoinfo);
4885 nlmsg_end(skb, nlh);
4886 return 0;
4887
4888 nla_put_failure:
4889 nlmsg_cancel(skb, nlh);
4890 return -EMSGSIZE;
4891 }
4892
inet6_dump_ifinfo(struct sk_buff * skb,struct netlink_callback * cb)4893 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4894 {
4895 struct net *net = sock_net(skb->sk);
4896 int h, s_h;
4897 int idx = 0, s_idx;
4898 struct net_device *dev;
4899 struct inet6_dev *idev;
4900 struct hlist_head *head;
4901
4902 s_h = cb->args[0];
4903 s_idx = cb->args[1];
4904
4905 rcu_read_lock();
4906 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4907 idx = 0;
4908 head = &net->dev_index_head[h];
4909 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4910 if (idx < s_idx)
4911 goto cont;
4912 idev = __in6_dev_get(dev);
4913 if (!idev)
4914 goto cont;
4915 if (inet6_fill_ifinfo(skb, idev,
4916 NETLINK_CB(cb->skb).portid,
4917 cb->nlh->nlmsg_seq,
4918 RTM_NEWLINK, NLM_F_MULTI) < 0)
4919 goto out;
4920 cont:
4921 idx++;
4922 }
4923 }
4924 out:
4925 rcu_read_unlock();
4926 cb->args[1] = idx;
4927 cb->args[0] = h;
4928
4929 return skb->len;
4930 }
4931
inet6_ifinfo_notify(int event,struct inet6_dev * idev)4932 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4933 {
4934 struct sk_buff *skb;
4935 struct net *net = dev_net(idev->dev);
4936 int err = -ENOBUFS;
4937
4938 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4939 if (!skb)
4940 goto errout;
4941
4942 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4943 if (err < 0) {
4944 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4945 WARN_ON(err == -EMSGSIZE);
4946 kfree_skb(skb);
4947 goto errout;
4948 }
4949 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4950 return;
4951 errout:
4952 if (err < 0)
4953 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4954 }
4955
inet6_prefix_nlmsg_size(void)4956 static inline size_t inet6_prefix_nlmsg_size(void)
4957 {
4958 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4959 + nla_total_size(sizeof(struct in6_addr))
4960 + nla_total_size(sizeof(struct prefix_cacheinfo));
4961 }
4962
inet6_fill_prefix(struct sk_buff * skb,struct inet6_dev * idev,struct prefix_info * pinfo,u32 portid,u32 seq,int event,unsigned int flags)4963 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4964 struct prefix_info *pinfo, u32 portid, u32 seq,
4965 int event, unsigned int flags)
4966 {
4967 struct prefixmsg *pmsg;
4968 struct nlmsghdr *nlh;
4969 struct prefix_cacheinfo ci;
4970
4971 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4972 if (!nlh)
4973 return -EMSGSIZE;
4974
4975 pmsg = nlmsg_data(nlh);
4976 pmsg->prefix_family = AF_INET6;
4977 pmsg->prefix_pad1 = 0;
4978 pmsg->prefix_pad2 = 0;
4979 pmsg->prefix_ifindex = idev->dev->ifindex;
4980 pmsg->prefix_len = pinfo->prefix_len;
4981 pmsg->prefix_type = pinfo->type;
4982 pmsg->prefix_pad3 = 0;
4983 pmsg->prefix_flags = 0;
4984 if (pinfo->onlink)
4985 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4986 if (pinfo->autoconf)
4987 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4988
4989 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4990 goto nla_put_failure;
4991 ci.preferred_time = ntohl(pinfo->prefered);
4992 ci.valid_time = ntohl(pinfo->valid);
4993 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4994 goto nla_put_failure;
4995 nlmsg_end(skb, nlh);
4996 return 0;
4997
4998 nla_put_failure:
4999 nlmsg_cancel(skb, nlh);
5000 return -EMSGSIZE;
5001 }
5002
inet6_prefix_notify(int event,struct inet6_dev * idev,struct prefix_info * pinfo)5003 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5004 struct prefix_info *pinfo)
5005 {
5006 struct sk_buff *skb;
5007 struct net *net = dev_net(idev->dev);
5008 int err = -ENOBUFS;
5009
5010 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5011 if (!skb)
5012 goto errout;
5013
5014 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5015 if (err < 0) {
5016 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5017 WARN_ON(err == -EMSGSIZE);
5018 kfree_skb(skb);
5019 goto errout;
5020 }
5021 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5022 return;
5023 errout:
5024 if (err < 0)
5025 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5026 }
5027
__ipv6_ifa_notify(int event,struct inet6_ifaddr * ifp)5028 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5029 {
5030 struct net *net = dev_net(ifp->idev->dev);
5031
5032 if (event)
5033 ASSERT_RTNL();
5034
5035 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5036
5037 switch (event) {
5038 case RTM_NEWADDR:
5039 /*
5040 * If the address was optimistic
5041 * we inserted the route at the start of
5042 * our DAD process, so we don't need
5043 * to do it again
5044 */
5045 if (!(ifp->rt->rt6i_node))
5046 ip6_ins_rt(ifp->rt);
5047 if (ifp->idev->cnf.forwarding)
5048 addrconf_join_anycast(ifp);
5049 if (!ipv6_addr_any(&ifp->peer_addr))
5050 addrconf_prefix_route(&ifp->peer_addr, 128,
5051 ifp->idev->dev, 0, 0);
5052 break;
5053 case RTM_DELADDR:
5054 if (ifp->idev->cnf.forwarding)
5055 addrconf_leave_anycast(ifp);
5056 addrconf_leave_solict(ifp->idev, &ifp->addr);
5057 if (!ipv6_addr_any(&ifp->peer_addr)) {
5058 struct rt6_info *rt;
5059
5060 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5061 ifp->idev->dev, 0, 0);
5062 if (rt && ip6_del_rt(rt))
5063 dst_free(&rt->dst);
5064 }
5065 dst_hold(&ifp->rt->dst);
5066
5067 if (ip6_del_rt(ifp->rt))
5068 dst_free(&ifp->rt->dst);
5069
5070 rt_genid_bump_ipv6(net);
5071 break;
5072 }
5073 atomic_inc(&net->ipv6.dev_addr_genid);
5074 }
5075
ipv6_ifa_notify(int event,struct inet6_ifaddr * ifp)5076 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5077 {
5078 rcu_read_lock_bh();
5079 if (likely(ifp->idev->dead == 0))
5080 __ipv6_ifa_notify(event, ifp);
5081 rcu_read_unlock_bh();
5082 }
5083
5084 #ifdef CONFIG_SYSCTL
5085
5086 static
addrconf_sysctl_forward(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)5087 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5088 void __user *buffer, size_t *lenp, loff_t *ppos)
5089 {
5090 int *valp = ctl->data;
5091 int val = *valp;
5092 loff_t pos = *ppos;
5093 struct ctl_table lctl;
5094 int ret;
5095
5096 /*
5097 * ctl->data points to idev->cnf.forwarding, we should
5098 * not modify it until we get the rtnl lock.
5099 */
5100 lctl = *ctl;
5101 lctl.data = &val;
5102
5103 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5104
5105 if (write)
5106 ret = addrconf_fixup_forwarding(ctl, valp, val);
5107 if (ret)
5108 *ppos = pos;
5109 return ret;
5110 }
5111
5112 static
addrconf_sysctl_mtu(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)5113 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5114 void __user *buffer, size_t *lenp, loff_t *ppos)
5115 {
5116 struct inet6_dev *idev = ctl->extra1;
5117 int min_mtu = IPV6_MIN_MTU;
5118 struct ctl_table lctl;
5119
5120 lctl = *ctl;
5121 lctl.extra1 = &min_mtu;
5122 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5123
5124 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5125 }
5126
dev_disable_change(struct inet6_dev * idev)5127 static void dev_disable_change(struct inet6_dev *idev)
5128 {
5129 struct netdev_notifier_info info;
5130
5131 if (!idev || !idev->dev)
5132 return;
5133
5134 netdev_notifier_info_init(&info, idev->dev);
5135 if (idev->cnf.disable_ipv6)
5136 addrconf_notify(NULL, NETDEV_DOWN, &info);
5137 else
5138 addrconf_notify(NULL, NETDEV_UP, &info);
5139 }
5140
addrconf_disable_change(struct net * net,__s32 newf)5141 static void addrconf_disable_change(struct net *net, __s32 newf)
5142 {
5143 struct net_device *dev;
5144 struct inet6_dev *idev;
5145
5146 rcu_read_lock();
5147 for_each_netdev_rcu(net, dev) {
5148 idev = __in6_dev_get(dev);
5149 if (idev) {
5150 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5151 idev->cnf.disable_ipv6 = newf;
5152 if (changed)
5153 dev_disable_change(idev);
5154 }
5155 }
5156 rcu_read_unlock();
5157 }
5158
addrconf_disable_ipv6(struct ctl_table * table,int * p,int newf)5159 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5160 {
5161 struct net *net;
5162 int old;
5163
5164 if (!rtnl_trylock())
5165 return restart_syscall();
5166
5167 net = (struct net *)table->extra2;
5168 old = *p;
5169 *p = newf;
5170
5171 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5172 rtnl_unlock();
5173 return 0;
5174 }
5175
5176 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5177 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5178 addrconf_disable_change(net, newf);
5179 } else if ((!newf) ^ (!old))
5180 dev_disable_change((struct inet6_dev *)table->extra1);
5181
5182 rtnl_unlock();
5183 return 0;
5184 }
5185
5186 static
addrconf_sysctl_disable(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)5187 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5188 void __user *buffer, size_t *lenp, loff_t *ppos)
5189 {
5190 int *valp = ctl->data;
5191 int val = *valp;
5192 loff_t pos = *ppos;
5193 struct ctl_table lctl;
5194 int ret;
5195
5196 /*
5197 * ctl->data points to idev->cnf.disable_ipv6, we should
5198 * not modify it until we get the rtnl lock.
5199 */
5200 lctl = *ctl;
5201 lctl.data = &val;
5202
5203 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5204
5205 if (write)
5206 ret = addrconf_disable_ipv6(ctl, valp, val);
5207 if (ret)
5208 *ppos = pos;
5209 return ret;
5210 }
5211
5212 static
addrconf_sysctl_proxy_ndp(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)5213 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5214 void __user *buffer, size_t *lenp, loff_t *ppos)
5215 {
5216 int *valp = ctl->data;
5217 int ret;
5218 int old, new;
5219
5220 old = *valp;
5221 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5222 new = *valp;
5223
5224 if (write && old != new) {
5225 struct net *net = ctl->extra2;
5226
5227 if (!rtnl_trylock())
5228 return restart_syscall();
5229
5230 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5231 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5232 NETCONFA_IFINDEX_DEFAULT,
5233 net->ipv6.devconf_dflt);
5234 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5235 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5236 NETCONFA_IFINDEX_ALL,
5237 net->ipv6.devconf_all);
5238 else {
5239 struct inet6_dev *idev = ctl->extra1;
5240
5241 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5242 idev->dev->ifindex,
5243 &idev->cnf);
5244 }
5245 rtnl_unlock();
5246 }
5247
5248 return ret;
5249 }
5250
addrconf_sysctl_stable_secret(struct ctl_table * ctl,int write,void __user * buffer,size_t * lenp,loff_t * ppos)5251 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5252 void __user *buffer, size_t *lenp,
5253 loff_t *ppos)
5254 {
5255 int err;
5256 struct in6_addr addr;
5257 char str[IPV6_MAX_STRLEN];
5258 struct ctl_table lctl = *ctl;
5259 struct net *net = ctl->extra2;
5260 struct ipv6_stable_secret *secret = ctl->data;
5261
5262 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5263 return -EIO;
5264
5265 lctl.maxlen = IPV6_MAX_STRLEN;
5266 lctl.data = str;
5267
5268 if (!rtnl_trylock())
5269 return restart_syscall();
5270
5271 if (!write && !secret->initialized) {
5272 err = -EIO;
5273 goto out;
5274 }
5275
5276 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5277 if (err >= sizeof(str)) {
5278 err = -EIO;
5279 goto out;
5280 }
5281
5282 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5283 if (err || !write)
5284 goto out;
5285
5286 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5287 err = -EIO;
5288 goto out;
5289 }
5290
5291 secret->initialized = true;
5292 secret->secret = addr;
5293
5294 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5295 struct net_device *dev;
5296
5297 for_each_netdev(net, dev) {
5298 struct inet6_dev *idev = __in6_dev_get(dev);
5299
5300 if (idev) {
5301 idev->addr_gen_mode =
5302 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5303 }
5304 }
5305 } else {
5306 struct inet6_dev *idev = ctl->extra1;
5307
5308 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5309 }
5310
5311 out:
5312 rtnl_unlock();
5313
5314 return err;
5315 }
5316
5317 static struct addrconf_sysctl_table
5318 {
5319 struct ctl_table_header *sysctl_header;
5320 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5321 } addrconf_sysctl __read_mostly = {
5322 .sysctl_header = NULL,
5323 .addrconf_vars = {
5324 {
5325 .procname = "forwarding",
5326 .data = &ipv6_devconf.forwarding,
5327 .maxlen = sizeof(int),
5328 .mode = 0644,
5329 .proc_handler = addrconf_sysctl_forward,
5330 },
5331 {
5332 .procname = "hop_limit",
5333 .data = &ipv6_devconf.hop_limit,
5334 .maxlen = sizeof(int),
5335 .mode = 0644,
5336 .proc_handler = proc_dointvec,
5337 },
5338 {
5339 .procname = "mtu",
5340 .data = &ipv6_devconf.mtu6,
5341 .maxlen = sizeof(int),
5342 .mode = 0644,
5343 .proc_handler = addrconf_sysctl_mtu,
5344 },
5345 {
5346 .procname = "accept_ra",
5347 .data = &ipv6_devconf.accept_ra,
5348 .maxlen = sizeof(int),
5349 .mode = 0644,
5350 .proc_handler = proc_dointvec,
5351 },
5352 {
5353 .procname = "accept_redirects",
5354 .data = &ipv6_devconf.accept_redirects,
5355 .maxlen = sizeof(int),
5356 .mode = 0644,
5357 .proc_handler = proc_dointvec,
5358 },
5359 {
5360 .procname = "autoconf",
5361 .data = &ipv6_devconf.autoconf,
5362 .maxlen = sizeof(int),
5363 .mode = 0644,
5364 .proc_handler = proc_dointvec,
5365 },
5366 {
5367 .procname = "dad_transmits",
5368 .data = &ipv6_devconf.dad_transmits,
5369 .maxlen = sizeof(int),
5370 .mode = 0644,
5371 .proc_handler = proc_dointvec,
5372 },
5373 {
5374 .procname = "router_solicitations",
5375 .data = &ipv6_devconf.rtr_solicits,
5376 .maxlen = sizeof(int),
5377 .mode = 0644,
5378 .proc_handler = proc_dointvec,
5379 },
5380 {
5381 .procname = "router_solicitation_interval",
5382 .data = &ipv6_devconf.rtr_solicit_interval,
5383 .maxlen = sizeof(int),
5384 .mode = 0644,
5385 .proc_handler = proc_dointvec_jiffies,
5386 },
5387 {
5388 .procname = "router_solicitation_delay",
5389 .data = &ipv6_devconf.rtr_solicit_delay,
5390 .maxlen = sizeof(int),
5391 .mode = 0644,
5392 .proc_handler = proc_dointvec_jiffies,
5393 },
5394 {
5395 .procname = "force_mld_version",
5396 .data = &ipv6_devconf.force_mld_version,
5397 .maxlen = sizeof(int),
5398 .mode = 0644,
5399 .proc_handler = proc_dointvec,
5400 },
5401 {
5402 .procname = "mldv1_unsolicited_report_interval",
5403 .data =
5404 &ipv6_devconf.mldv1_unsolicited_report_interval,
5405 .maxlen = sizeof(int),
5406 .mode = 0644,
5407 .proc_handler = proc_dointvec_ms_jiffies,
5408 },
5409 {
5410 .procname = "mldv2_unsolicited_report_interval",
5411 .data =
5412 &ipv6_devconf.mldv2_unsolicited_report_interval,
5413 .maxlen = sizeof(int),
5414 .mode = 0644,
5415 .proc_handler = proc_dointvec_ms_jiffies,
5416 },
5417 {
5418 .procname = "use_tempaddr",
5419 .data = &ipv6_devconf.use_tempaddr,
5420 .maxlen = sizeof(int),
5421 .mode = 0644,
5422 .proc_handler = proc_dointvec,
5423 },
5424 {
5425 .procname = "temp_valid_lft",
5426 .data = &ipv6_devconf.temp_valid_lft,
5427 .maxlen = sizeof(int),
5428 .mode = 0644,
5429 .proc_handler = proc_dointvec,
5430 },
5431 {
5432 .procname = "temp_prefered_lft",
5433 .data = &ipv6_devconf.temp_prefered_lft,
5434 .maxlen = sizeof(int),
5435 .mode = 0644,
5436 .proc_handler = proc_dointvec,
5437 },
5438 {
5439 .procname = "regen_max_retry",
5440 .data = &ipv6_devconf.regen_max_retry,
5441 .maxlen = sizeof(int),
5442 .mode = 0644,
5443 .proc_handler = proc_dointvec,
5444 },
5445 {
5446 .procname = "max_desync_factor",
5447 .data = &ipv6_devconf.max_desync_factor,
5448 .maxlen = sizeof(int),
5449 .mode = 0644,
5450 .proc_handler = proc_dointvec,
5451 },
5452 {
5453 .procname = "max_addresses",
5454 .data = &ipv6_devconf.max_addresses,
5455 .maxlen = sizeof(int),
5456 .mode = 0644,
5457 .proc_handler = proc_dointvec,
5458 },
5459 {
5460 .procname = "accept_ra_defrtr",
5461 .data = &ipv6_devconf.accept_ra_defrtr,
5462 .maxlen = sizeof(int),
5463 .mode = 0644,
5464 .proc_handler = proc_dointvec,
5465 },
5466 {
5467 .procname = "accept_ra_min_hop_limit",
5468 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5469 .maxlen = sizeof(int),
5470 .mode = 0644,
5471 .proc_handler = proc_dointvec,
5472 },
5473 {
5474 .procname = "accept_ra_pinfo",
5475 .data = &ipv6_devconf.accept_ra_pinfo,
5476 .maxlen = sizeof(int),
5477 .mode = 0644,
5478 .proc_handler = proc_dointvec,
5479 },
5480 #ifdef CONFIG_IPV6_ROUTER_PREF
5481 {
5482 .procname = "accept_ra_rtr_pref",
5483 .data = &ipv6_devconf.accept_ra_rtr_pref,
5484 .maxlen = sizeof(int),
5485 .mode = 0644,
5486 .proc_handler = proc_dointvec,
5487 },
5488 {
5489 .procname = "router_probe_interval",
5490 .data = &ipv6_devconf.rtr_probe_interval,
5491 .maxlen = sizeof(int),
5492 .mode = 0644,
5493 .proc_handler = proc_dointvec_jiffies,
5494 },
5495 #ifdef CONFIG_IPV6_ROUTE_INFO
5496 {
5497 .procname = "accept_ra_rt_info_max_plen",
5498 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5499 .maxlen = sizeof(int),
5500 .mode = 0644,
5501 .proc_handler = proc_dointvec,
5502 },
5503 #endif
5504 #endif
5505 {
5506 .procname = "proxy_ndp",
5507 .data = &ipv6_devconf.proxy_ndp,
5508 .maxlen = sizeof(int),
5509 .mode = 0644,
5510 .proc_handler = addrconf_sysctl_proxy_ndp,
5511 },
5512 {
5513 .procname = "accept_source_route",
5514 .data = &ipv6_devconf.accept_source_route,
5515 .maxlen = sizeof(int),
5516 .mode = 0644,
5517 .proc_handler = proc_dointvec,
5518 },
5519 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5520 {
5521 .procname = "optimistic_dad",
5522 .data = &ipv6_devconf.optimistic_dad,
5523 .maxlen = sizeof(int),
5524 .mode = 0644,
5525 .proc_handler = proc_dointvec,
5526
5527 },
5528 {
5529 .procname = "use_optimistic",
5530 .data = &ipv6_devconf.use_optimistic,
5531 .maxlen = sizeof(int),
5532 .mode = 0644,
5533 .proc_handler = proc_dointvec,
5534
5535 },
5536 #endif
5537 #ifdef CONFIG_IPV6_MROUTE
5538 {
5539 .procname = "mc_forwarding",
5540 .data = &ipv6_devconf.mc_forwarding,
5541 .maxlen = sizeof(int),
5542 .mode = 0444,
5543 .proc_handler = proc_dointvec,
5544 },
5545 #endif
5546 {
5547 .procname = "disable_ipv6",
5548 .data = &ipv6_devconf.disable_ipv6,
5549 .maxlen = sizeof(int),
5550 .mode = 0644,
5551 .proc_handler = addrconf_sysctl_disable,
5552 },
5553 {
5554 .procname = "accept_dad",
5555 .data = &ipv6_devconf.accept_dad,
5556 .maxlen = sizeof(int),
5557 .mode = 0644,
5558 .proc_handler = proc_dointvec,
5559 },
5560 {
5561 .procname = "force_tllao",
5562 .data = &ipv6_devconf.force_tllao,
5563 .maxlen = sizeof(int),
5564 .mode = 0644,
5565 .proc_handler = proc_dointvec
5566 },
5567 {
5568 .procname = "ndisc_notify",
5569 .data = &ipv6_devconf.ndisc_notify,
5570 .maxlen = sizeof(int),
5571 .mode = 0644,
5572 .proc_handler = proc_dointvec
5573 },
5574 {
5575 .procname = "suppress_frag_ndisc",
5576 .data = &ipv6_devconf.suppress_frag_ndisc,
5577 .maxlen = sizeof(int),
5578 .mode = 0644,
5579 .proc_handler = proc_dointvec
5580 },
5581 {
5582 .procname = "accept_ra_from_local",
5583 .data = &ipv6_devconf.accept_ra_from_local,
5584 .maxlen = sizeof(int),
5585 .mode = 0644,
5586 .proc_handler = proc_dointvec,
5587 },
5588 {
5589 .procname = "accept_ra_mtu",
5590 .data = &ipv6_devconf.accept_ra_mtu,
5591 .maxlen = sizeof(int),
5592 .mode = 0644,
5593 .proc_handler = proc_dointvec,
5594 },
5595 {
5596 .procname = "stable_secret",
5597 .data = &ipv6_devconf.stable_secret,
5598 .maxlen = IPV6_MAX_STRLEN,
5599 .mode = 0600,
5600 .proc_handler = addrconf_sysctl_stable_secret,
5601 },
5602 {
5603 /* sentinel */
5604 }
5605 },
5606 };
5607
__addrconf_sysctl_register(struct net * net,char * dev_name,struct inet6_dev * idev,struct ipv6_devconf * p)5608 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5609 struct inet6_dev *idev, struct ipv6_devconf *p)
5610 {
5611 int i;
5612 struct addrconf_sysctl_table *t;
5613 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5614
5615 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5616 if (!t)
5617 goto out;
5618
5619 for (i = 0; t->addrconf_vars[i].data; i++) {
5620 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5621 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5622 t->addrconf_vars[i].extra2 = net;
5623 }
5624
5625 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5626
5627 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5628 if (!t->sysctl_header)
5629 goto free;
5630
5631 p->sysctl = t;
5632 return 0;
5633
5634 free:
5635 kfree(t);
5636 out:
5637 return -ENOBUFS;
5638 }
5639
__addrconf_sysctl_unregister(struct ipv6_devconf * p)5640 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5641 {
5642 struct addrconf_sysctl_table *t;
5643
5644 if (!p->sysctl)
5645 return;
5646
5647 t = p->sysctl;
5648 p->sysctl = NULL;
5649 unregister_net_sysctl_table(t->sysctl_header);
5650 kfree(t);
5651 }
5652
addrconf_sysctl_register(struct inet6_dev * idev)5653 static int addrconf_sysctl_register(struct inet6_dev *idev)
5654 {
5655 int err;
5656
5657 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5658 return -EINVAL;
5659
5660 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5661 &ndisc_ifinfo_sysctl_change);
5662 if (err)
5663 return err;
5664 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5665 idev, &idev->cnf);
5666 if (err)
5667 neigh_sysctl_unregister(idev->nd_parms);
5668
5669 return err;
5670 }
5671
addrconf_sysctl_unregister(struct inet6_dev * idev)5672 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5673 {
5674 __addrconf_sysctl_unregister(&idev->cnf);
5675 neigh_sysctl_unregister(idev->nd_parms);
5676 }
5677
5678
5679 #endif
5680
addrconf_init_net(struct net * net)5681 static int __net_init addrconf_init_net(struct net *net)
5682 {
5683 int err = -ENOMEM;
5684 struct ipv6_devconf *all, *dflt;
5685
5686 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5687 if (!all)
5688 goto err_alloc_all;
5689
5690 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5691 if (!dflt)
5692 goto err_alloc_dflt;
5693
5694 /* these will be inherited by all namespaces */
5695 dflt->autoconf = ipv6_defaults.autoconf;
5696 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5697
5698 dflt->stable_secret.initialized = false;
5699 all->stable_secret.initialized = false;
5700
5701 net->ipv6.devconf_all = all;
5702 net->ipv6.devconf_dflt = dflt;
5703
5704 #ifdef CONFIG_SYSCTL
5705 err = __addrconf_sysctl_register(net, "all", NULL, all);
5706 if (err < 0)
5707 goto err_reg_all;
5708
5709 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5710 if (err < 0)
5711 goto err_reg_dflt;
5712 #endif
5713 return 0;
5714
5715 #ifdef CONFIG_SYSCTL
5716 err_reg_dflt:
5717 __addrconf_sysctl_unregister(all);
5718 err_reg_all:
5719 kfree(dflt);
5720 #endif
5721 err_alloc_dflt:
5722 kfree(all);
5723 err_alloc_all:
5724 return err;
5725 }
5726
addrconf_exit_net(struct net * net)5727 static void __net_exit addrconf_exit_net(struct net *net)
5728 {
5729 #ifdef CONFIG_SYSCTL
5730 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5731 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5732 #endif
5733 kfree(net->ipv6.devconf_dflt);
5734 kfree(net->ipv6.devconf_all);
5735 }
5736
5737 static struct pernet_operations addrconf_ops = {
5738 .init = addrconf_init_net,
5739 .exit = addrconf_exit_net,
5740 };
5741
5742 static struct rtnl_af_ops inet6_ops __read_mostly = {
5743 .family = AF_INET6,
5744 .fill_link_af = inet6_fill_link_af,
5745 .get_link_af_size = inet6_get_link_af_size,
5746 .validate_link_af = inet6_validate_link_af,
5747 .set_link_af = inet6_set_link_af,
5748 };
5749
5750 /*
5751 * Init / cleanup code
5752 */
5753
addrconf_init(void)5754 int __init addrconf_init(void)
5755 {
5756 struct inet6_dev *idev;
5757 int i, err;
5758
5759 err = ipv6_addr_label_init();
5760 if (err < 0) {
5761 pr_crit("%s: cannot initialize default policy table: %d\n",
5762 __func__, err);
5763 goto out;
5764 }
5765
5766 err = register_pernet_subsys(&addrconf_ops);
5767 if (err < 0)
5768 goto out_addrlabel;
5769
5770 addrconf_wq = create_workqueue("ipv6_addrconf");
5771 if (!addrconf_wq) {
5772 err = -ENOMEM;
5773 goto out_nowq;
5774 }
5775
5776 /* The addrconf netdev notifier requires that loopback_dev
5777 * has it's ipv6 private information allocated and setup
5778 * before it can bring up and give link-local addresses
5779 * to other devices which are up.
5780 *
5781 * Unfortunately, loopback_dev is not necessarily the first
5782 * entry in the global dev_base list of net devices. In fact,
5783 * it is likely to be the very last entry on that list.
5784 * So this causes the notifier registry below to try and
5785 * give link-local addresses to all devices besides loopback_dev
5786 * first, then loopback_dev, which cases all the non-loopback_dev
5787 * devices to fail to get a link-local address.
5788 *
5789 * So, as a temporary fix, allocate the ipv6 structure for
5790 * loopback_dev first by hand.
5791 * Longer term, all of the dependencies ipv6 has upon the loopback
5792 * device and it being up should be removed.
5793 */
5794 rtnl_lock();
5795 idev = ipv6_add_dev(init_net.loopback_dev);
5796 rtnl_unlock();
5797 if (IS_ERR(idev)) {
5798 err = PTR_ERR(idev);
5799 goto errlo;
5800 }
5801
5802 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5803 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5804
5805 register_netdevice_notifier(&ipv6_dev_notf);
5806
5807 addrconf_verify();
5808
5809 rtnl_af_register(&inet6_ops);
5810
5811 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5812 NULL);
5813 if (err < 0)
5814 goto errout;
5815
5816 /* Only the first call to __rtnl_register can fail */
5817 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5818 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5819 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5820 inet6_dump_ifaddr, NULL);
5821 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5822 inet6_dump_ifmcaddr, NULL);
5823 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5824 inet6_dump_ifacaddr, NULL);
5825 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5826 inet6_netconf_dump_devconf, NULL);
5827
5828 ipv6_addr_label_rtnl_register();
5829
5830 return 0;
5831 errout:
5832 rtnl_af_unregister(&inet6_ops);
5833 unregister_netdevice_notifier(&ipv6_dev_notf);
5834 errlo:
5835 destroy_workqueue(addrconf_wq);
5836 out_nowq:
5837 unregister_pernet_subsys(&addrconf_ops);
5838 out_addrlabel:
5839 ipv6_addr_label_cleanup();
5840 out:
5841 return err;
5842 }
5843
addrconf_cleanup(void)5844 void addrconf_cleanup(void)
5845 {
5846 struct net_device *dev;
5847 int i;
5848
5849 unregister_netdevice_notifier(&ipv6_dev_notf);
5850 unregister_pernet_subsys(&addrconf_ops);
5851 ipv6_addr_label_cleanup();
5852
5853 rtnl_lock();
5854
5855 __rtnl_af_unregister(&inet6_ops);
5856
5857 /* clean dev list */
5858 for_each_netdev(&init_net, dev) {
5859 if (__in6_dev_get(dev) == NULL)
5860 continue;
5861 addrconf_ifdown(dev, 1);
5862 }
5863 addrconf_ifdown(init_net.loopback_dev, 2);
5864
5865 /*
5866 * Check hash table.
5867 */
5868 spin_lock_bh(&addrconf_hash_lock);
5869 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5870 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5871 spin_unlock_bh(&addrconf_hash_lock);
5872 cancel_delayed_work(&addr_chk_work);
5873 rtnl_unlock();
5874
5875 destroy_workqueue(addrconf_wq);
5876 }
5877