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ipv4: provide addr and netconf dump consistency info
[deliverable/linux.git] / net / ipv6 / addrconf.c
1 /*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15 /*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41 #define pr_fmt(fmt) "IPv6: " fmt
42
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/in6.h>
50 #include <linux/netdevice.h>
51 #include <linux/if_addr.h>
52 #include <linux/if_arp.h>
53 #include <linux/if_arcnet.h>
54 #include <linux/if_infiniband.h>
55 #include <linux/route.h>
56 #include <linux/inetdevice.h>
57 #include <linux/init.h>
58 #include <linux/slab.h>
59 #ifdef CONFIG_SYSCTL
60 #include <linux/sysctl.h>
61 #endif
62 #include <linux/capability.h>
63 #include <linux/delay.h>
64 #include <linux/notifier.h>
65 #include <linux/string.h>
66 #include <linux/hash.h>
67
68 #include <net/net_namespace.h>
69 #include <net/sock.h>
70 #include <net/snmp.h>
71
72 #include <net/af_ieee802154.h>
73 #include <net/ipv6.h>
74 #include <net/protocol.h>
75 #include <net/ndisc.h>
76 #include <net/ip6_route.h>
77 #include <net/addrconf.h>
78 #include <net/tcp.h>
79 #include <net/ip.h>
80 #include <net/netlink.h>
81 #include <net/pkt_sched.h>
82 #include <linux/if_tunnel.h>
83 #include <linux/rtnetlink.h>
84 #include <linux/netconf.h>
85
86 #ifdef CONFIG_IPV6_PRIVACY
87 #include <linux/random.h>
88 #endif
89
90 #include <linux/uaccess.h>
91 #include <asm/unaligned.h>
92
93 #include <linux/proc_fs.h>
94 #include <linux/seq_file.h>
95 #include <linux/export.h>
96
97 /* Set to 3 to get tracing... */
98 #define ACONF_DEBUG 2
99
100 #if ACONF_DEBUG >= 3
101 #define ADBG(x) printk x
102 #else
103 #define ADBG(x)
104 #endif
105
106 #define INFINITY_LIFE_TIME 0xFFFFFFFF
107
108 static inline u32 cstamp_delta(unsigned long cstamp)
109 {
110 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
111 }
112
113 #ifdef CONFIG_SYSCTL
114 static void addrconf_sysctl_register(struct inet6_dev *idev);
115 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
116 #else
117 static inline void addrconf_sysctl_register(struct inet6_dev *idev)
118 {
119 }
120
121 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
122 {
123 }
124 #endif
125
126 #ifdef CONFIG_IPV6_PRIVACY
127 static void __ipv6_regen_rndid(struct inet6_dev *idev);
128 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
129 static void ipv6_regen_rndid(unsigned long data);
130 #endif
131
132 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
133 static int ipv6_count_addresses(struct inet6_dev *idev);
134
135 /*
136 * Configured unicast address hash table
137 */
138 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
139 static DEFINE_SPINLOCK(addrconf_hash_lock);
140
141 static void addrconf_verify(unsigned long);
142
143 static DEFINE_TIMER(addr_chk_timer, addrconf_verify, 0, 0);
144 static DEFINE_SPINLOCK(addrconf_verify_lock);
145
146 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
147 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
148
149 static void addrconf_type_change(struct net_device *dev,
150 unsigned long event);
151 static int addrconf_ifdown(struct net_device *dev, int how);
152
153 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
154 int plen,
155 const struct net_device *dev,
156 u32 flags, u32 noflags);
157
158 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
159 static void addrconf_dad_timer(unsigned long data);
160 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
161 static void addrconf_dad_run(struct inet6_dev *idev);
162 static void addrconf_rs_timer(unsigned long data);
163 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
164 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
165
166 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
167 struct prefix_info *pinfo);
168 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
169 struct net_device *dev);
170
171 static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);
172
173 static struct ipv6_devconf ipv6_devconf __read_mostly = {
174 .forwarding = 0,
175 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
176 .mtu6 = IPV6_MIN_MTU,
177 .accept_ra = 1,
178 .accept_redirects = 1,
179 .autoconf = 1,
180 .force_mld_version = 0,
181 .dad_transmits = 1,
182 .rtr_solicits = MAX_RTR_SOLICITATIONS,
183 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
184 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
185 #ifdef CONFIG_IPV6_PRIVACY
186 .use_tempaddr = 0,
187 .temp_valid_lft = TEMP_VALID_LIFETIME,
188 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
189 .regen_max_retry = REGEN_MAX_RETRY,
190 .max_desync_factor = MAX_DESYNC_FACTOR,
191 #endif
192 .max_addresses = IPV6_MAX_ADDRESSES,
193 .accept_ra_defrtr = 1,
194 .accept_ra_pinfo = 1,
195 #ifdef CONFIG_IPV6_ROUTER_PREF
196 .accept_ra_rtr_pref = 1,
197 .rtr_probe_interval = 60 * HZ,
198 #ifdef CONFIG_IPV6_ROUTE_INFO
199 .accept_ra_rt_info_max_plen = 0,
200 #endif
201 #endif
202 .proxy_ndp = 0,
203 .accept_source_route = 0, /* we do not accept RH0 by default. */
204 .disable_ipv6 = 0,
205 .accept_dad = 1,
206 };
207
208 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
209 .forwarding = 0,
210 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
211 .mtu6 = IPV6_MIN_MTU,
212 .accept_ra = 1,
213 .accept_redirects = 1,
214 .autoconf = 1,
215 .dad_transmits = 1,
216 .rtr_solicits = MAX_RTR_SOLICITATIONS,
217 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
218 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
219 #ifdef CONFIG_IPV6_PRIVACY
220 .use_tempaddr = 0,
221 .temp_valid_lft = TEMP_VALID_LIFETIME,
222 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
223 .regen_max_retry = REGEN_MAX_RETRY,
224 .max_desync_factor = MAX_DESYNC_FACTOR,
225 #endif
226 .max_addresses = IPV6_MAX_ADDRESSES,
227 .accept_ra_defrtr = 1,
228 .accept_ra_pinfo = 1,
229 #ifdef CONFIG_IPV6_ROUTER_PREF
230 .accept_ra_rtr_pref = 1,
231 .rtr_probe_interval = 60 * HZ,
232 #ifdef CONFIG_IPV6_ROUTE_INFO
233 .accept_ra_rt_info_max_plen = 0,
234 #endif
235 #endif
236 .proxy_ndp = 0,
237 .accept_source_route = 0, /* we do not accept RH0 by default. */
238 .disable_ipv6 = 0,
239 .accept_dad = 1,
240 };
241
242 /* IPv6 Wildcard Address and Loopback Address defined by RFC2553 */
243 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
244 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
245 const struct in6_addr in6addr_linklocal_allnodes = IN6ADDR_LINKLOCAL_ALLNODES_INIT;
246 const struct in6_addr in6addr_linklocal_allrouters = IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
247 const struct in6_addr in6addr_interfacelocal_allnodes = IN6ADDR_INTERFACELOCAL_ALLNODES_INIT;
248 const struct in6_addr in6addr_interfacelocal_allrouters = IN6ADDR_INTERFACELOCAL_ALLROUTERS_INIT;
249 const struct in6_addr in6addr_sitelocal_allrouters = IN6ADDR_SITELOCAL_ALLROUTERS_INIT;
250
251 /* Check if a valid qdisc is available */
252 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
253 {
254 return !qdisc_tx_is_noop(dev);
255 }
256
257 static void addrconf_del_timer(struct inet6_ifaddr *ifp)
258 {
259 if (del_timer(&ifp->timer))
260 __in6_ifa_put(ifp);
261 }
262
263 enum addrconf_timer_t {
264 AC_NONE,
265 AC_DAD,
266 AC_RS,
267 };
268
269 static void addrconf_mod_timer(struct inet6_ifaddr *ifp,
270 enum addrconf_timer_t what,
271 unsigned long when)
272 {
273 if (!del_timer(&ifp->timer))
274 in6_ifa_hold(ifp);
275
276 switch (what) {
277 case AC_DAD:
278 ifp->timer.function = addrconf_dad_timer;
279 break;
280 case AC_RS:
281 ifp->timer.function = addrconf_rs_timer;
282 break;
283 default:
284 break;
285 }
286 ifp->timer.expires = jiffies + when;
287 add_timer(&ifp->timer);
288 }
289
290 static int snmp6_alloc_dev(struct inet6_dev *idev)
291 {
292 if (snmp_mib_init((void __percpu **)idev->stats.ipv6,
293 sizeof(struct ipstats_mib),
294 __alignof__(struct ipstats_mib)) < 0)
295 goto err_ip;
296 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
297 GFP_KERNEL);
298 if (!idev->stats.icmpv6dev)
299 goto err_icmp;
300 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
301 GFP_KERNEL);
302 if (!idev->stats.icmpv6msgdev)
303 goto err_icmpmsg;
304
305 return 0;
306
307 err_icmpmsg:
308 kfree(idev->stats.icmpv6dev);
309 err_icmp:
310 snmp_mib_free((void __percpu **)idev->stats.ipv6);
311 err_ip:
312 return -ENOMEM;
313 }
314
315 static void snmp6_free_dev(struct inet6_dev *idev)
316 {
317 kfree(idev->stats.icmpv6msgdev);
318 kfree(idev->stats.icmpv6dev);
319 snmp_mib_free((void __percpu **)idev->stats.ipv6);
320 }
321
322 /* Nobody refers to this device, we may destroy it. */
323
324 void in6_dev_finish_destroy(struct inet6_dev *idev)
325 {
326 struct net_device *dev = idev->dev;
327
328 WARN_ON(!list_empty(&idev->addr_list));
329 WARN_ON(idev->mc_list != NULL);
330
331 #ifdef NET_REFCNT_DEBUG
332 pr_debug("%s: %s\n", __func__, dev ? dev->name : "NIL");
333 #endif
334 dev_put(dev);
335 if (!idev->dead) {
336 pr_warn("Freeing alive inet6 device %p\n", idev);
337 return;
338 }
339 snmp6_free_dev(idev);
340 kfree_rcu(idev, rcu);
341 }
342 EXPORT_SYMBOL(in6_dev_finish_destroy);
343
344 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
345 {
346 struct inet6_dev *ndev;
347
348 ASSERT_RTNL();
349
350 if (dev->mtu < IPV6_MIN_MTU)
351 return NULL;
352
353 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
354
355 if (ndev == NULL)
356 return NULL;
357
358 rwlock_init(&ndev->lock);
359 ndev->dev = dev;
360 INIT_LIST_HEAD(&ndev->addr_list);
361
362 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
363 ndev->cnf.mtu6 = dev->mtu;
364 ndev->cnf.sysctl = NULL;
365 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
366 if (ndev->nd_parms == NULL) {
367 kfree(ndev);
368 return NULL;
369 }
370 if (ndev->cnf.forwarding)
371 dev_disable_lro(dev);
372 /* We refer to the device */
373 dev_hold(dev);
374
375 if (snmp6_alloc_dev(ndev) < 0) {
376 ADBG((KERN_WARNING
377 "%s: cannot allocate memory for statistics; dev=%s.\n",
378 __func__, dev->name));
379 neigh_parms_release(&nd_tbl, ndev->nd_parms);
380 dev_put(dev);
381 kfree(ndev);
382 return NULL;
383 }
384
385 if (snmp6_register_dev(ndev) < 0) {
386 ADBG((KERN_WARNING
387 "%s: cannot create /proc/net/dev_snmp6/%s\n",
388 __func__, dev->name));
389 neigh_parms_release(&nd_tbl, ndev->nd_parms);
390 ndev->dead = 1;
391 in6_dev_finish_destroy(ndev);
392 return NULL;
393 }
394
395 /* One reference from device. We must do this before
396 * we invoke __ipv6_regen_rndid().
397 */
398 in6_dev_hold(ndev);
399
400 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
401 ndev->cnf.accept_dad = -1;
402
403 #if IS_ENABLED(CONFIG_IPV6_SIT)
404 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
405 pr_info("%s: Disabled Multicast RS\n", dev->name);
406 ndev->cnf.rtr_solicits = 0;
407 }
408 #endif
409
410 #ifdef CONFIG_IPV6_PRIVACY
411 INIT_LIST_HEAD(&ndev->tempaddr_list);
412 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
413 if ((dev->flags&IFF_LOOPBACK) ||
414 dev->type == ARPHRD_TUNNEL ||
415 dev->type == ARPHRD_TUNNEL6 ||
416 dev->type == ARPHRD_SIT ||
417 dev->type == ARPHRD_NONE) {
418 ndev->cnf.use_tempaddr = -1;
419 } else {
420 in6_dev_hold(ndev);
421 ipv6_regen_rndid((unsigned long) ndev);
422 }
423 #endif
424
425 if (netif_running(dev) && addrconf_qdisc_ok(dev))
426 ndev->if_flags |= IF_READY;
427
428 ipv6_mc_init_dev(ndev);
429 ndev->tstamp = jiffies;
430 addrconf_sysctl_register(ndev);
431 /* protected by rtnl_lock */
432 rcu_assign_pointer(dev->ip6_ptr, ndev);
433
434 /* Join interface-local all-node multicast group */
435 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
436
437 /* Join all-node multicast group */
438 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
439
440 /* Join all-router multicast group if forwarding is set */
441 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
442 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
443
444 return ndev;
445 }
446
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 (!idev)
457 return NULL;
458 }
459
460 if (dev->flags&IFF_UP)
461 ipv6_mc_up(idev);
462 return idev;
463 }
464
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
478 return size;
479 }
480
481 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
482 struct ipv6_devconf *devconf, u32 portid,
483 u32 seq, int event, unsigned int flags,
484 int type)
485 {
486 struct nlmsghdr *nlh;
487 struct netconfmsg *ncm;
488
489 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
490 flags);
491 if (nlh == NULL)
492 return -EMSGSIZE;
493
494 ncm = nlmsg_data(nlh);
495 ncm->ncm_family = AF_INET6;
496
497 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
498 goto nla_put_failure;
499
500 /* type -1 is used for ALL */
501 if ((type == -1 || type == NETCONFA_FORWARDING) &&
502 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
503 goto nla_put_failure;
504 #ifdef CONFIG_IPV6_MROUTE
505 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
506 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
507 devconf->mc_forwarding) < 0)
508 goto nla_put_failure;
509 #endif
510 return nlmsg_end(skb, nlh);
511
512 nla_put_failure:
513 nlmsg_cancel(skb, nlh);
514 return -EMSGSIZE;
515 }
516
517 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
518 struct ipv6_devconf *devconf)
519 {
520 struct sk_buff *skb;
521 int err = -ENOBUFS;
522
523 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
524 if (skb == NULL)
525 goto errout;
526
527 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
528 RTM_NEWNETCONF, 0, type);
529 if (err < 0) {
530 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
531 WARN_ON(err == -EMSGSIZE);
532 kfree_skb(skb);
533 goto errout;
534 }
535 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
536 return;
537 errout:
538 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
539 }
540
541 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
542 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
543 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
544 };
545
546 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
547 struct nlmsghdr *nlh)
548 {
549 struct net *net = sock_net(in_skb->sk);
550 struct nlattr *tb[NETCONFA_MAX+1];
551 struct netconfmsg *ncm;
552 struct sk_buff *skb;
553 struct ipv6_devconf *devconf;
554 struct inet6_dev *in6_dev;
555 struct net_device *dev;
556 int ifindex;
557 int err;
558
559 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
560 devconf_ipv6_policy);
561 if (err < 0)
562 goto errout;
563
564 err = EINVAL;
565 if (!tb[NETCONFA_IFINDEX])
566 goto errout;
567
568 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
569 switch (ifindex) {
570 case NETCONFA_IFINDEX_ALL:
571 devconf = net->ipv6.devconf_all;
572 break;
573 case NETCONFA_IFINDEX_DEFAULT:
574 devconf = net->ipv6.devconf_dflt;
575 break;
576 default:
577 dev = __dev_get_by_index(net, ifindex);
578 if (dev == NULL)
579 goto errout;
580 in6_dev = __in6_dev_get(dev);
581 if (in6_dev == NULL)
582 goto errout;
583 devconf = &in6_dev->cnf;
584 break;
585 }
586
587 err = -ENOBUFS;
588 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
589 if (skb == NULL)
590 goto errout;
591
592 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
593 NETLINK_CB(in_skb).portid,
594 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
595 -1);
596 if (err < 0) {
597 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
598 WARN_ON(err == -EMSGSIZE);
599 kfree_skb(skb);
600 goto errout;
601 }
602 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
603 errout:
604 return err;
605 }
606
607 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
608 struct netlink_callback *cb)
609 {
610 struct net *net = sock_net(skb->sk);
611 int h, s_h;
612 int idx, s_idx;
613 struct net_device *dev;
614 struct inet6_dev *idev;
615 struct hlist_head *head;
616
617 s_h = cb->args[0];
618 s_idx = idx = cb->args[1];
619
620 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
621 idx = 0;
622 head = &net->dev_index_head[h];
623 rcu_read_lock();
624 hlist_for_each_entry_rcu(dev, head, index_hlist) {
625 if (idx < s_idx)
626 goto cont;
627 idev = __in6_dev_get(dev);
628 if (!idev)
629 goto cont;
630
631 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
632 &idev->cnf,
633 NETLINK_CB(cb->skb).portid,
634 cb->nlh->nlmsg_seq,
635 RTM_NEWNETCONF,
636 NLM_F_MULTI,
637 -1) <= 0) {
638 rcu_read_unlock();
639 goto done;
640 }
641 cont:
642 idx++;
643 }
644 rcu_read_unlock();
645 }
646 if (h == NETDEV_HASHENTRIES) {
647 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
648 net->ipv6.devconf_all,
649 NETLINK_CB(cb->skb).portid,
650 cb->nlh->nlmsg_seq,
651 RTM_NEWNETCONF, NLM_F_MULTI,
652 -1) <= 0)
653 goto done;
654 else
655 h++;
656 }
657 if (h == NETDEV_HASHENTRIES + 1) {
658 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
659 net->ipv6.devconf_dflt,
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 done:
669 cb->args[0] = h;
670 cb->args[1] = idx;
671
672 return skb->len;
673 }
674
675 #ifdef CONFIG_SYSCTL
676 static void dev_forward_change(struct inet6_dev *idev)
677 {
678 struct net_device *dev;
679 struct inet6_ifaddr *ifa;
680
681 if (!idev)
682 return;
683 dev = idev->dev;
684 if (idev->cnf.forwarding)
685 dev_disable_lro(dev);
686 if (dev->flags & IFF_MULTICAST) {
687 if (idev->cnf.forwarding) {
688 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
689 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
690 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
691 } else {
692 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
693 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
694 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
695 }
696 }
697
698 list_for_each_entry(ifa, &idev->addr_list, if_list) {
699 if (ifa->flags&IFA_F_TENTATIVE)
700 continue;
701 if (idev->cnf.forwarding)
702 addrconf_join_anycast(ifa);
703 else
704 addrconf_leave_anycast(ifa);
705 }
706 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
707 dev->ifindex, &idev->cnf);
708 }
709
710
711 static void addrconf_forward_change(struct net *net, __s32 newf)
712 {
713 struct net_device *dev;
714 struct inet6_dev *idev;
715
716 for_each_netdev(net, dev) {
717 idev = __in6_dev_get(dev);
718 if (idev) {
719 int changed = (!idev->cnf.forwarding) ^ (!newf);
720 idev->cnf.forwarding = newf;
721 if (changed)
722 dev_forward_change(idev);
723 }
724 }
725 }
726
727 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
728 {
729 struct net *net;
730 int old;
731
732 if (!rtnl_trylock())
733 return restart_syscall();
734
735 net = (struct net *)table->extra2;
736 old = *p;
737 *p = newf;
738
739 if (p == &net->ipv6.devconf_dflt->forwarding) {
740 if ((!newf) ^ (!old))
741 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
742 NETCONFA_IFINDEX_DEFAULT,
743 net->ipv6.devconf_dflt);
744 rtnl_unlock();
745 return 0;
746 }
747
748 if (p == &net->ipv6.devconf_all->forwarding) {
749 net->ipv6.devconf_dflt->forwarding = newf;
750 addrconf_forward_change(net, newf);
751 if ((!newf) ^ (!old))
752 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
753 NETCONFA_IFINDEX_ALL,
754 net->ipv6.devconf_all);
755 } else if ((!newf) ^ (!old))
756 dev_forward_change((struct inet6_dev *)table->extra1);
757 rtnl_unlock();
758
759 if (newf)
760 rt6_purge_dflt_routers(net);
761 return 1;
762 }
763 #endif
764
765 /* Nobody refers to this ifaddr, destroy it */
766 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
767 {
768 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
769
770 #ifdef NET_REFCNT_DEBUG
771 pr_debug("%s\n", __func__);
772 #endif
773
774 in6_dev_put(ifp->idev);
775
776 if (del_timer(&ifp->timer))
777 pr_notice("Timer is still running, when freeing ifa=%p\n", ifp);
778
779 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
780 pr_warn("Freeing alive inet6 address %p\n", ifp);
781 return;
782 }
783 ip6_rt_put(ifp->rt);
784
785 kfree_rcu(ifp, rcu);
786 }
787
788 static void
789 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
790 {
791 struct list_head *p;
792 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
793
794 /*
795 * Each device address list is sorted in order of scope -
796 * global before linklocal.
797 */
798 list_for_each(p, &idev->addr_list) {
799 struct inet6_ifaddr *ifa
800 = list_entry(p, struct inet6_ifaddr, if_list);
801 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
802 break;
803 }
804
805 list_add_tail(&ifp->if_list, p);
806 }
807
808 static u32 inet6_addr_hash(const struct in6_addr *addr)
809 {
810 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
811 }
812
813 /* On success it returns ifp with increased reference count */
814
815 static struct inet6_ifaddr *
816 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr, int pfxlen,
817 int scope, u32 flags)
818 {
819 struct inet6_ifaddr *ifa = NULL;
820 struct rt6_info *rt;
821 unsigned int hash;
822 int err = 0;
823 int addr_type = ipv6_addr_type(addr);
824
825 if (addr_type == IPV6_ADDR_ANY ||
826 addr_type & IPV6_ADDR_MULTICAST ||
827 (!(idev->dev->flags & IFF_LOOPBACK) &&
828 addr_type & IPV6_ADDR_LOOPBACK))
829 return ERR_PTR(-EADDRNOTAVAIL);
830
831 rcu_read_lock_bh();
832 if (idev->dead) {
833 err = -ENODEV; /*XXX*/
834 goto out2;
835 }
836
837 if (idev->cnf.disable_ipv6) {
838 err = -EACCES;
839 goto out2;
840 }
841
842 spin_lock(&addrconf_hash_lock);
843
844 /* Ignore adding duplicate addresses on an interface */
845 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
846 ADBG(("ipv6_add_addr: already assigned\n"));
847 err = -EEXIST;
848 goto out;
849 }
850
851 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
852
853 if (ifa == NULL) {
854 ADBG(("ipv6_add_addr: malloc failed\n"));
855 err = -ENOBUFS;
856 goto out;
857 }
858
859 rt = addrconf_dst_alloc(idev, addr, false);
860 if (IS_ERR(rt)) {
861 err = PTR_ERR(rt);
862 goto out;
863 }
864
865 ifa->addr = *addr;
866
867 spin_lock_init(&ifa->lock);
868 spin_lock_init(&ifa->state_lock);
869 init_timer(&ifa->timer);
870 INIT_HLIST_NODE(&ifa->addr_lst);
871 ifa->timer.data = (unsigned long) ifa;
872 ifa->scope = scope;
873 ifa->prefix_len = pfxlen;
874 ifa->flags = flags | IFA_F_TENTATIVE;
875 ifa->cstamp = ifa->tstamp = jiffies;
876
877 ifa->rt = rt;
878
879 ifa->idev = idev;
880 in6_dev_hold(idev);
881 /* For caller */
882 in6_ifa_hold(ifa);
883
884 /* Add to big hash table */
885 hash = inet6_addr_hash(addr);
886
887 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
888 spin_unlock(&addrconf_hash_lock);
889
890 write_lock(&idev->lock);
891 /* Add to inet6_dev unicast addr list. */
892 ipv6_link_dev_addr(idev, ifa);
893
894 #ifdef CONFIG_IPV6_PRIVACY
895 if (ifa->flags&IFA_F_TEMPORARY) {
896 list_add(&ifa->tmp_list, &idev->tempaddr_list);
897 in6_ifa_hold(ifa);
898 }
899 #endif
900
901 in6_ifa_hold(ifa);
902 write_unlock(&idev->lock);
903 out2:
904 rcu_read_unlock_bh();
905
906 if (likely(err == 0))
907 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_UP, ifa);
908 else {
909 kfree(ifa);
910 ifa = ERR_PTR(err);
911 }
912
913 return ifa;
914 out:
915 spin_unlock(&addrconf_hash_lock);
916 goto out2;
917 }
918
919 /* This function wants to get referenced ifp and releases it before return */
920
921 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
922 {
923 struct inet6_ifaddr *ifa, *ifn;
924 struct inet6_dev *idev = ifp->idev;
925 int state;
926 int deleted = 0, onlink = 0;
927 unsigned long expires = jiffies;
928
929 spin_lock_bh(&ifp->state_lock);
930 state = ifp->state;
931 ifp->state = INET6_IFADDR_STATE_DEAD;
932 spin_unlock_bh(&ifp->state_lock);
933
934 if (state == INET6_IFADDR_STATE_DEAD)
935 goto out;
936
937 spin_lock_bh(&addrconf_hash_lock);
938 hlist_del_init_rcu(&ifp->addr_lst);
939 spin_unlock_bh(&addrconf_hash_lock);
940
941 write_lock_bh(&idev->lock);
942 #ifdef CONFIG_IPV6_PRIVACY
943 if (ifp->flags&IFA_F_TEMPORARY) {
944 list_del(&ifp->tmp_list);
945 if (ifp->ifpub) {
946 in6_ifa_put(ifp->ifpub);
947 ifp->ifpub = NULL;
948 }
949 __in6_ifa_put(ifp);
950 }
951 #endif
952
953 list_for_each_entry_safe(ifa, ifn, &idev->addr_list, if_list) {
954 if (ifa == ifp) {
955 list_del_init(&ifp->if_list);
956 __in6_ifa_put(ifp);
957
958 if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
959 break;
960 deleted = 1;
961 continue;
962 } else if (ifp->flags & IFA_F_PERMANENT) {
963 if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
964 ifp->prefix_len)) {
965 if (ifa->flags & IFA_F_PERMANENT) {
966 onlink = 1;
967 if (deleted)
968 break;
969 } else {
970 unsigned long lifetime;
971
972 if (!onlink)
973 onlink = -1;
974
975 spin_lock(&ifa->lock);
976
977 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
978 /*
979 * Note: Because this address is
980 * not permanent, lifetime <
981 * LONG_MAX / HZ here.
982 */
983 if (time_before(expires,
984 ifa->tstamp + lifetime * HZ))
985 expires = ifa->tstamp + lifetime * HZ;
986 spin_unlock(&ifa->lock);
987 }
988 }
989 }
990 }
991 write_unlock_bh(&idev->lock);
992
993 addrconf_del_timer(ifp);
994
995 ipv6_ifa_notify(RTM_DELADDR, ifp);
996
997 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp);
998
999 /*
1000 * Purge or update corresponding prefix
1001 *
1002 * 1) we don't purge prefix here if address was not permanent.
1003 * prefix is managed by its own lifetime.
1004 * 2) if there're no addresses, delete prefix.
1005 * 3) if there're still other permanent address(es),
1006 * corresponding prefix is still permanent.
1007 * 4) otherwise, update prefix lifetime to the
1008 * longest valid lifetime among the corresponding
1009 * addresses on the device.
1010 * Note: subsequent RA will update lifetime.
1011 *
1012 * --yoshfuji
1013 */
1014 if ((ifp->flags & IFA_F_PERMANENT) && onlink < 1) {
1015 struct in6_addr prefix;
1016 struct rt6_info *rt;
1017
1018 ipv6_addr_prefix(&prefix, &ifp->addr, ifp->prefix_len);
1019
1020 rt = addrconf_get_prefix_route(&prefix,
1021 ifp->prefix_len,
1022 ifp->idev->dev,
1023 0, RTF_GATEWAY | RTF_DEFAULT);
1024
1025 if (rt) {
1026 if (onlink == 0) {
1027 ip6_del_rt(rt);
1028 rt = NULL;
1029 } else if (!(rt->rt6i_flags & RTF_EXPIRES)) {
1030 rt6_set_expires(rt, expires);
1031 }
1032 }
1033 ip6_rt_put(rt);
1034 }
1035
1036 /* clean up prefsrc entries */
1037 rt6_remove_prefsrc(ifp);
1038 out:
1039 in6_ifa_put(ifp);
1040 }
1041
1042 #ifdef CONFIG_IPV6_PRIVACY
1043 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1044 {
1045 struct inet6_dev *idev = ifp->idev;
1046 struct in6_addr addr, *tmpaddr;
1047 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1048 unsigned long regen_advance;
1049 int tmp_plen;
1050 int ret = 0;
1051 int max_addresses;
1052 u32 addr_flags;
1053 unsigned long now = jiffies;
1054
1055 write_lock(&idev->lock);
1056 if (ift) {
1057 spin_lock_bh(&ift->lock);
1058 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1059 spin_unlock_bh(&ift->lock);
1060 tmpaddr = &addr;
1061 } else {
1062 tmpaddr = NULL;
1063 }
1064 retry:
1065 in6_dev_hold(idev);
1066 if (idev->cnf.use_tempaddr <= 0) {
1067 write_unlock(&idev->lock);
1068 pr_info("%s: use_tempaddr is disabled\n", __func__);
1069 in6_dev_put(idev);
1070 ret = -1;
1071 goto out;
1072 }
1073 spin_lock_bh(&ifp->lock);
1074 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1075 idev->cnf.use_tempaddr = -1; /*XXX*/
1076 spin_unlock_bh(&ifp->lock);
1077 write_unlock(&idev->lock);
1078 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1079 __func__);
1080 in6_dev_put(idev);
1081 ret = -1;
1082 goto out;
1083 }
1084 in6_ifa_hold(ifp);
1085 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1086 __ipv6_try_regen_rndid(idev, tmpaddr);
1087 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1088 age = (now - ifp->tstamp) / HZ;
1089 tmp_valid_lft = min_t(__u32,
1090 ifp->valid_lft,
1091 idev->cnf.temp_valid_lft + age);
1092 tmp_prefered_lft = min_t(__u32,
1093 ifp->prefered_lft,
1094 idev->cnf.temp_prefered_lft + age -
1095 idev->cnf.max_desync_factor);
1096 tmp_plen = ifp->prefix_len;
1097 max_addresses = idev->cnf.max_addresses;
1098 tmp_tstamp = ifp->tstamp;
1099 spin_unlock_bh(&ifp->lock);
1100
1101 regen_advance = idev->cnf.regen_max_retry *
1102 idev->cnf.dad_transmits *
1103 idev->nd_parms->retrans_time / HZ;
1104 write_unlock(&idev->lock);
1105
1106 /* A temporary address is created only if this calculated Preferred
1107 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1108 * an implementation must not create a temporary address with a zero
1109 * Preferred Lifetime.
1110 */
1111 if (tmp_prefered_lft <= regen_advance) {
1112 in6_ifa_put(ifp);
1113 in6_dev_put(idev);
1114 ret = -1;
1115 goto out;
1116 }
1117
1118 addr_flags = IFA_F_TEMPORARY;
1119 /* set in addrconf_prefix_rcv() */
1120 if (ifp->flags & IFA_F_OPTIMISTIC)
1121 addr_flags |= IFA_F_OPTIMISTIC;
1122
1123 ift = !max_addresses ||
1124 ipv6_count_addresses(idev) < max_addresses ?
1125 ipv6_add_addr(idev, &addr, tmp_plen,
1126 ipv6_addr_type(&addr)&IPV6_ADDR_SCOPE_MASK,
1127 addr_flags) : NULL;
1128 if (IS_ERR_OR_NULL(ift)) {
1129 in6_ifa_put(ifp);
1130 in6_dev_put(idev);
1131 pr_info("%s: retry temporary address regeneration\n", __func__);
1132 tmpaddr = &addr;
1133 write_lock(&idev->lock);
1134 goto retry;
1135 }
1136
1137 spin_lock_bh(&ift->lock);
1138 ift->ifpub = ifp;
1139 ift->valid_lft = tmp_valid_lft;
1140 ift->prefered_lft = tmp_prefered_lft;
1141 ift->cstamp = now;
1142 ift->tstamp = tmp_tstamp;
1143 spin_unlock_bh(&ift->lock);
1144
1145 addrconf_dad_start(ift);
1146 in6_ifa_put(ift);
1147 in6_dev_put(idev);
1148 out:
1149 return ret;
1150 }
1151 #endif
1152
1153 /*
1154 * Choose an appropriate source address (RFC3484)
1155 */
1156 enum {
1157 IPV6_SADDR_RULE_INIT = 0,
1158 IPV6_SADDR_RULE_LOCAL,
1159 IPV6_SADDR_RULE_SCOPE,
1160 IPV6_SADDR_RULE_PREFERRED,
1161 #ifdef CONFIG_IPV6_MIP6
1162 IPV6_SADDR_RULE_HOA,
1163 #endif
1164 IPV6_SADDR_RULE_OIF,
1165 IPV6_SADDR_RULE_LABEL,
1166 #ifdef CONFIG_IPV6_PRIVACY
1167 IPV6_SADDR_RULE_PRIVACY,
1168 #endif
1169 IPV6_SADDR_RULE_ORCHID,
1170 IPV6_SADDR_RULE_PREFIX,
1171 IPV6_SADDR_RULE_MAX
1172 };
1173
1174 struct ipv6_saddr_score {
1175 int rule;
1176 int addr_type;
1177 struct inet6_ifaddr *ifa;
1178 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1179 int scopedist;
1180 int matchlen;
1181 };
1182
1183 struct ipv6_saddr_dst {
1184 const struct in6_addr *addr;
1185 int ifindex;
1186 int scope;
1187 int label;
1188 unsigned int prefs;
1189 };
1190
1191 static inline int ipv6_saddr_preferred(int type)
1192 {
1193 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1194 return 1;
1195 return 0;
1196 }
1197
1198 static int ipv6_get_saddr_eval(struct net *net,
1199 struct ipv6_saddr_score *score,
1200 struct ipv6_saddr_dst *dst,
1201 int i)
1202 {
1203 int ret;
1204
1205 if (i <= score->rule) {
1206 switch (i) {
1207 case IPV6_SADDR_RULE_SCOPE:
1208 ret = score->scopedist;
1209 break;
1210 case IPV6_SADDR_RULE_PREFIX:
1211 ret = score->matchlen;
1212 break;
1213 default:
1214 ret = !!test_bit(i, score->scorebits);
1215 }
1216 goto out;
1217 }
1218
1219 switch (i) {
1220 case IPV6_SADDR_RULE_INIT:
1221 /* Rule 0: remember if hiscore is not ready yet */
1222 ret = !!score->ifa;
1223 break;
1224 case IPV6_SADDR_RULE_LOCAL:
1225 /* Rule 1: Prefer same address */
1226 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1227 break;
1228 case IPV6_SADDR_RULE_SCOPE:
1229 /* Rule 2: Prefer appropriate scope
1230 *
1231 * ret
1232 * ^
1233 * -1 | d 15
1234 * ---+--+-+---> scope
1235 * |
1236 * | d is scope of the destination.
1237 * B-d | \
1238 * | \ <- smaller scope is better if
1239 * B-15 | \ if scope is enough for destinaion.
1240 * | ret = B - scope (-1 <= scope >= d <= 15).
1241 * d-C-1 | /
1242 * |/ <- greater is better
1243 * -C / if scope is not enough for destination.
1244 * /| ret = scope - C (-1 <= d < scope <= 15).
1245 *
1246 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1247 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1248 * Assume B = 0 and we get C > 29.
1249 */
1250 ret = __ipv6_addr_src_scope(score->addr_type);
1251 if (ret >= dst->scope)
1252 ret = -ret;
1253 else
1254 ret -= 128; /* 30 is enough */
1255 score->scopedist = ret;
1256 break;
1257 case IPV6_SADDR_RULE_PREFERRED:
1258 /* Rule 3: Avoid deprecated and optimistic addresses */
1259 ret = ipv6_saddr_preferred(score->addr_type) ||
1260 !(score->ifa->flags & (IFA_F_DEPRECATED|IFA_F_OPTIMISTIC));
1261 break;
1262 #ifdef CONFIG_IPV6_MIP6
1263 case IPV6_SADDR_RULE_HOA:
1264 {
1265 /* Rule 4: Prefer home address */
1266 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1267 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1268 break;
1269 }
1270 #endif
1271 case IPV6_SADDR_RULE_OIF:
1272 /* Rule 5: Prefer outgoing interface */
1273 ret = (!dst->ifindex ||
1274 dst->ifindex == score->ifa->idev->dev->ifindex);
1275 break;
1276 case IPV6_SADDR_RULE_LABEL:
1277 /* Rule 6: Prefer matching label */
1278 ret = ipv6_addr_label(net,
1279 &score->ifa->addr, score->addr_type,
1280 score->ifa->idev->dev->ifindex) == dst->label;
1281 break;
1282 #ifdef CONFIG_IPV6_PRIVACY
1283 case IPV6_SADDR_RULE_PRIVACY:
1284 {
1285 /* Rule 7: Prefer public address
1286 * Note: prefer temporary address if use_tempaddr >= 2
1287 */
1288 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1289 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1290 score->ifa->idev->cnf.use_tempaddr >= 2;
1291 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1292 break;
1293 }
1294 #endif
1295 case IPV6_SADDR_RULE_ORCHID:
1296 /* Rule 8-: Prefer ORCHID vs ORCHID or
1297 * non-ORCHID vs non-ORCHID
1298 */
1299 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1300 ipv6_addr_orchid(dst->addr));
1301 break;
1302 case IPV6_SADDR_RULE_PREFIX:
1303 /* Rule 8: Use longest matching prefix */
1304 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1305 if (ret > score->ifa->prefix_len)
1306 ret = score->ifa->prefix_len;
1307 score->matchlen = ret;
1308 break;
1309 default:
1310 ret = 0;
1311 }
1312
1313 if (ret)
1314 __set_bit(i, score->scorebits);
1315 score->rule = i;
1316 out:
1317 return ret;
1318 }
1319
1320 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1321 const struct in6_addr *daddr, unsigned int prefs,
1322 struct in6_addr *saddr)
1323 {
1324 struct ipv6_saddr_score scores[2],
1325 *score = &scores[0], *hiscore = &scores[1];
1326 struct ipv6_saddr_dst dst;
1327 struct net_device *dev;
1328 int dst_type;
1329
1330 dst_type = __ipv6_addr_type(daddr);
1331 dst.addr = daddr;
1332 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1333 dst.scope = __ipv6_addr_src_scope(dst_type);
1334 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1335 dst.prefs = prefs;
1336
1337 hiscore->rule = -1;
1338 hiscore->ifa = NULL;
1339
1340 rcu_read_lock();
1341
1342 for_each_netdev_rcu(net, dev) {
1343 struct inet6_dev *idev;
1344
1345 /* Candidate Source Address (section 4)
1346 * - multicast and link-local destination address,
1347 * the set of candidate source address MUST only
1348 * include addresses assigned to interfaces
1349 * belonging to the same link as the outgoing
1350 * interface.
1351 * (- For site-local destination addresses, the
1352 * set of candidate source addresses MUST only
1353 * include addresses assigned to interfaces
1354 * belonging to the same site as the outgoing
1355 * interface.)
1356 */
1357 if (((dst_type & IPV6_ADDR_MULTICAST) ||
1358 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL) &&
1359 dst.ifindex && dev->ifindex != dst.ifindex)
1360 continue;
1361
1362 idev = __in6_dev_get(dev);
1363 if (!idev)
1364 continue;
1365
1366 read_lock_bh(&idev->lock);
1367 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1368 int i;
1369
1370 /*
1371 * - Tentative Address (RFC2462 section 5.4)
1372 * - A tentative address is not considered
1373 * "assigned to an interface" in the traditional
1374 * sense, unless it is also flagged as optimistic.
1375 * - Candidate Source Address (section 4)
1376 * - In any case, anycast addresses, multicast
1377 * addresses, and the unspecified address MUST
1378 * NOT be included in a candidate set.
1379 */
1380 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1381 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1382 continue;
1383
1384 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1385
1386 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1387 score->addr_type & IPV6_ADDR_MULTICAST)) {
1388 LIMIT_NETDEBUG(KERN_DEBUG
1389 "ADDRCONF: unspecified / multicast address "
1390 "assigned as unicast address on %s",
1391 dev->name);
1392 continue;
1393 }
1394
1395 score->rule = -1;
1396 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1397
1398 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1399 int minihiscore, miniscore;
1400
1401 minihiscore = ipv6_get_saddr_eval(net, hiscore, &dst, i);
1402 miniscore = ipv6_get_saddr_eval(net, score, &dst, i);
1403
1404 if (minihiscore > miniscore) {
1405 if (i == IPV6_SADDR_RULE_SCOPE &&
1406 score->scopedist > 0) {
1407 /*
1408 * special case:
1409 * each remaining entry
1410 * has too small (not enough)
1411 * scope, because ifa entries
1412 * are sorted by their scope
1413 * values.
1414 */
1415 goto try_nextdev;
1416 }
1417 break;
1418 } else if (minihiscore < miniscore) {
1419 if (hiscore->ifa)
1420 in6_ifa_put(hiscore->ifa);
1421
1422 in6_ifa_hold(score->ifa);
1423
1424 swap(hiscore, score);
1425
1426 /* restore our iterator */
1427 score->ifa = hiscore->ifa;
1428
1429 break;
1430 }
1431 }
1432 }
1433 try_nextdev:
1434 read_unlock_bh(&idev->lock);
1435 }
1436 rcu_read_unlock();
1437
1438 if (!hiscore->ifa)
1439 return -EADDRNOTAVAIL;
1440
1441 *saddr = hiscore->ifa->addr;
1442 in6_ifa_put(hiscore->ifa);
1443 return 0;
1444 }
1445 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1446
1447 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1448 unsigned char banned_flags)
1449 {
1450 struct inet6_dev *idev;
1451 int err = -EADDRNOTAVAIL;
1452
1453 rcu_read_lock();
1454 idev = __in6_dev_get(dev);
1455 if (idev) {
1456 struct inet6_ifaddr *ifp;
1457
1458 read_lock_bh(&idev->lock);
1459 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1460 if (ifp->scope == IFA_LINK &&
1461 !(ifp->flags & banned_flags)) {
1462 *addr = ifp->addr;
1463 err = 0;
1464 break;
1465 }
1466 }
1467 read_unlock_bh(&idev->lock);
1468 }
1469 rcu_read_unlock();
1470 return err;
1471 }
1472
1473 static int ipv6_count_addresses(struct inet6_dev *idev)
1474 {
1475 int cnt = 0;
1476 struct inet6_ifaddr *ifp;
1477
1478 read_lock_bh(&idev->lock);
1479 list_for_each_entry(ifp, &idev->addr_list, if_list)
1480 cnt++;
1481 read_unlock_bh(&idev->lock);
1482 return cnt;
1483 }
1484
1485 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1486 struct net_device *dev, int strict)
1487 {
1488 struct inet6_ifaddr *ifp;
1489 unsigned int hash = inet6_addr_hash(addr);
1490
1491 rcu_read_lock_bh();
1492 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1493 if (!net_eq(dev_net(ifp->idev->dev), net))
1494 continue;
1495 if (ipv6_addr_equal(&ifp->addr, addr) &&
1496 !(ifp->flags&IFA_F_TENTATIVE) &&
1497 (dev == NULL || ifp->idev->dev == dev ||
1498 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1499 rcu_read_unlock_bh();
1500 return 1;
1501 }
1502 }
1503
1504 rcu_read_unlock_bh();
1505 return 0;
1506 }
1507 EXPORT_SYMBOL(ipv6_chk_addr);
1508
1509 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1510 struct net_device *dev)
1511 {
1512 unsigned int hash = inet6_addr_hash(addr);
1513 struct inet6_ifaddr *ifp;
1514
1515 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1516 if (!net_eq(dev_net(ifp->idev->dev), net))
1517 continue;
1518 if (ipv6_addr_equal(&ifp->addr, addr)) {
1519 if (dev == NULL || ifp->idev->dev == dev)
1520 return true;
1521 }
1522 }
1523 return false;
1524 }
1525
1526 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1527 {
1528 struct inet6_dev *idev;
1529 struct inet6_ifaddr *ifa;
1530 int onlink;
1531
1532 onlink = 0;
1533 rcu_read_lock();
1534 idev = __in6_dev_get(dev);
1535 if (idev) {
1536 read_lock_bh(&idev->lock);
1537 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1538 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1539 ifa->prefix_len);
1540 if (onlink)
1541 break;
1542 }
1543 read_unlock_bh(&idev->lock);
1544 }
1545 rcu_read_unlock();
1546 return onlink;
1547 }
1548 EXPORT_SYMBOL(ipv6_chk_prefix);
1549
1550 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1551 struct net_device *dev, int strict)
1552 {
1553 struct inet6_ifaddr *ifp, *result = NULL;
1554 unsigned int hash = inet6_addr_hash(addr);
1555
1556 rcu_read_lock_bh();
1557 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1558 if (!net_eq(dev_net(ifp->idev->dev), net))
1559 continue;
1560 if (ipv6_addr_equal(&ifp->addr, addr)) {
1561 if (dev == NULL || ifp->idev->dev == dev ||
1562 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1563 result = ifp;
1564 in6_ifa_hold(ifp);
1565 break;
1566 }
1567 }
1568 }
1569 rcu_read_unlock_bh();
1570
1571 return result;
1572 }
1573
1574 /* Gets referenced address, destroys ifaddr */
1575
1576 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1577 {
1578 if (ifp->flags&IFA_F_PERMANENT) {
1579 spin_lock_bh(&ifp->lock);
1580 addrconf_del_timer(ifp);
1581 ifp->flags |= IFA_F_TENTATIVE;
1582 if (dad_failed)
1583 ifp->flags |= IFA_F_DADFAILED;
1584 spin_unlock_bh(&ifp->lock);
1585 if (dad_failed)
1586 ipv6_ifa_notify(0, ifp);
1587 in6_ifa_put(ifp);
1588 #ifdef CONFIG_IPV6_PRIVACY
1589 } else if (ifp->flags&IFA_F_TEMPORARY) {
1590 struct inet6_ifaddr *ifpub;
1591 spin_lock_bh(&ifp->lock);
1592 ifpub = ifp->ifpub;
1593 if (ifpub) {
1594 in6_ifa_hold(ifpub);
1595 spin_unlock_bh(&ifp->lock);
1596 ipv6_create_tempaddr(ifpub, ifp);
1597 in6_ifa_put(ifpub);
1598 } else {
1599 spin_unlock_bh(&ifp->lock);
1600 }
1601 ipv6_del_addr(ifp);
1602 #endif
1603 } else
1604 ipv6_del_addr(ifp);
1605 }
1606
1607 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1608 {
1609 int err = -ENOENT;
1610
1611 spin_lock(&ifp->state_lock);
1612 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1613 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1614 err = 0;
1615 }
1616 spin_unlock(&ifp->state_lock);
1617
1618 return err;
1619 }
1620
1621 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1622 {
1623 struct inet6_dev *idev = ifp->idev;
1624
1625 if (addrconf_dad_end(ifp)) {
1626 in6_ifa_put(ifp);
1627 return;
1628 }
1629
1630 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1631 ifp->idev->dev->name, &ifp->addr);
1632
1633 if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1634 struct in6_addr addr;
1635
1636 addr.s6_addr32[0] = htonl(0xfe800000);
1637 addr.s6_addr32[1] = 0;
1638
1639 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1640 ipv6_addr_equal(&ifp->addr, &addr)) {
1641 /* DAD failed for link-local based on MAC address */
1642 idev->cnf.disable_ipv6 = 1;
1643
1644 pr_info("%s: IPv6 being disabled!\n",
1645 ifp->idev->dev->name);
1646 }
1647 }
1648
1649 addrconf_dad_stop(ifp, 1);
1650 }
1651
1652 /* Join to solicited addr multicast group. */
1653
1654 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1655 {
1656 struct in6_addr maddr;
1657
1658 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1659 return;
1660
1661 addrconf_addr_solict_mult(addr, &maddr);
1662 ipv6_dev_mc_inc(dev, &maddr);
1663 }
1664
1665 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1666 {
1667 struct in6_addr maddr;
1668
1669 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1670 return;
1671
1672 addrconf_addr_solict_mult(addr, &maddr);
1673 __ipv6_dev_mc_dec(idev, &maddr);
1674 }
1675
1676 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1677 {
1678 struct in6_addr addr;
1679 if (ifp->prefix_len == 127) /* RFC 6164 */
1680 return;
1681 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1682 if (ipv6_addr_any(&addr))
1683 return;
1684 ipv6_dev_ac_inc(ifp->idev->dev, &addr);
1685 }
1686
1687 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1688 {
1689 struct in6_addr addr;
1690 if (ifp->prefix_len == 127) /* RFC 6164 */
1691 return;
1692 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1693 if (ipv6_addr_any(&addr))
1694 return;
1695 __ipv6_dev_ac_dec(ifp->idev, &addr);
1696 }
1697
1698 static int addrconf_ifid_eui48(u8 *eui, struct net_device *dev)
1699 {
1700 if (dev->addr_len != ETH_ALEN)
1701 return -1;
1702 memcpy(eui, dev->dev_addr, 3);
1703 memcpy(eui + 5, dev->dev_addr + 3, 3);
1704
1705 /*
1706 * The zSeries OSA network cards can be shared among various
1707 * OS instances, but the OSA cards have only one MAC address.
1708 * This leads to duplicate address conflicts in conjunction
1709 * with IPv6 if more than one instance uses the same card.
1710 *
1711 * The driver for these cards can deliver a unique 16-bit
1712 * identifier for each instance sharing the same card. It is
1713 * placed instead of 0xFFFE in the interface identifier. The
1714 * "u" bit of the interface identifier is not inverted in this
1715 * case. Hence the resulting interface identifier has local
1716 * scope according to RFC2373.
1717 */
1718 if (dev->dev_id) {
1719 eui[3] = (dev->dev_id >> 8) & 0xFF;
1720 eui[4] = dev->dev_id & 0xFF;
1721 } else {
1722 eui[3] = 0xFF;
1723 eui[4] = 0xFE;
1724 eui[0] ^= 2;
1725 }
1726 return 0;
1727 }
1728
1729 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1730 {
1731 if (dev->addr_len != IEEE802154_ADDR_LEN)
1732 return -1;
1733 memcpy(eui, dev->dev_addr, 8);
1734 eui[0] ^= 2;
1735 return 0;
1736 }
1737
1738 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1739 {
1740 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1741 if (dev->addr_len != ARCNET_ALEN)
1742 return -1;
1743 memset(eui, 0, 7);
1744 eui[7] = *(u8 *)dev->dev_addr;
1745 return 0;
1746 }
1747
1748 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1749 {
1750 if (dev->addr_len != INFINIBAND_ALEN)
1751 return -1;
1752 memcpy(eui, dev->dev_addr + 12, 8);
1753 eui[0] |= 2;
1754 return 0;
1755 }
1756
1757 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1758 {
1759 if (addr == 0)
1760 return -1;
1761 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1762 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1763 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1764 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1765 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1766 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1767 eui[1] = 0;
1768 eui[2] = 0x5E;
1769 eui[3] = 0xFE;
1770 memcpy(eui + 4, &addr, 4);
1771 return 0;
1772 }
1773
1774 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
1775 {
1776 if (dev->priv_flags & IFF_ISATAP)
1777 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1778 return -1;
1779 }
1780
1781 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
1782 {
1783 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
1784 }
1785
1786 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
1787 {
1788 switch (dev->type) {
1789 case ARPHRD_ETHER:
1790 case ARPHRD_FDDI:
1791 return addrconf_ifid_eui48(eui, dev);
1792 case ARPHRD_ARCNET:
1793 return addrconf_ifid_arcnet(eui, dev);
1794 case ARPHRD_INFINIBAND:
1795 return addrconf_ifid_infiniband(eui, dev);
1796 case ARPHRD_SIT:
1797 return addrconf_ifid_sit(eui, dev);
1798 case ARPHRD_IPGRE:
1799 return addrconf_ifid_gre(eui, dev);
1800 case ARPHRD_IEEE802154:
1801 return addrconf_ifid_eui64(eui, dev);
1802 }
1803 return -1;
1804 }
1805
1806 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
1807 {
1808 int err = -1;
1809 struct inet6_ifaddr *ifp;
1810
1811 read_lock_bh(&idev->lock);
1812 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1813 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
1814 memcpy(eui, ifp->addr.s6_addr+8, 8);
1815 err = 0;
1816 break;
1817 }
1818 }
1819 read_unlock_bh(&idev->lock);
1820 return err;
1821 }
1822
1823 #ifdef CONFIG_IPV6_PRIVACY
1824 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
1825 static void __ipv6_regen_rndid(struct inet6_dev *idev)
1826 {
1827 regen:
1828 get_random_bytes(idev->rndid, sizeof(idev->rndid));
1829 idev->rndid[0] &= ~0x02;
1830
1831 /*
1832 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
1833 * check if generated address is not inappropriate
1834 *
1835 * - Reserved subnet anycast (RFC 2526)
1836 * 11111101 11....11 1xxxxxxx
1837 * - ISATAP (RFC4214) 6.1
1838 * 00-00-5E-FE-xx-xx-xx-xx
1839 * - value 0
1840 * - XXX: already assigned to an address on the device
1841 */
1842 if (idev->rndid[0] == 0xfd &&
1843 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
1844 (idev->rndid[7]&0x80))
1845 goto regen;
1846 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
1847 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
1848 goto regen;
1849 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
1850 goto regen;
1851 }
1852 }
1853
1854 static void ipv6_regen_rndid(unsigned long data)
1855 {
1856 struct inet6_dev *idev = (struct inet6_dev *) data;
1857 unsigned long expires;
1858
1859 rcu_read_lock_bh();
1860 write_lock_bh(&idev->lock);
1861
1862 if (idev->dead)
1863 goto out;
1864
1865 __ipv6_regen_rndid(idev);
1866
1867 expires = jiffies +
1868 idev->cnf.temp_prefered_lft * HZ -
1869 idev->cnf.regen_max_retry * idev->cnf.dad_transmits * idev->nd_parms->retrans_time -
1870 idev->cnf.max_desync_factor * HZ;
1871 if (time_before(expires, jiffies)) {
1872 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
1873 __func__, idev->dev->name);
1874 goto out;
1875 }
1876
1877 if (!mod_timer(&idev->regen_timer, expires))
1878 in6_dev_hold(idev);
1879
1880 out:
1881 write_unlock_bh(&idev->lock);
1882 rcu_read_unlock_bh();
1883 in6_dev_put(idev);
1884 }
1885
1886 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
1887 {
1888 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
1889 __ipv6_regen_rndid(idev);
1890 }
1891 #endif
1892
1893 /*
1894 * Add prefix route.
1895 */
1896
1897 static void
1898 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
1899 unsigned long expires, u32 flags)
1900 {
1901 struct fib6_config cfg = {
1902 .fc_table = RT6_TABLE_PREFIX,
1903 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1904 .fc_ifindex = dev->ifindex,
1905 .fc_expires = expires,
1906 .fc_dst_len = plen,
1907 .fc_flags = RTF_UP | flags,
1908 .fc_nlinfo.nl_net = dev_net(dev),
1909 .fc_protocol = RTPROT_KERNEL,
1910 };
1911
1912 cfg.fc_dst = *pfx;
1913
1914 /* Prevent useless cloning on PtP SIT.
1915 This thing is done here expecting that the whole
1916 class of non-broadcast devices need not cloning.
1917 */
1918 #if IS_ENABLED(CONFIG_IPV6_SIT)
1919 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
1920 cfg.fc_flags |= RTF_NONEXTHOP;
1921 #endif
1922
1923 ip6_route_add(&cfg);
1924 }
1925
1926
1927 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
1928 int plen,
1929 const struct net_device *dev,
1930 u32 flags, u32 noflags)
1931 {
1932 struct fib6_node *fn;
1933 struct rt6_info *rt = NULL;
1934 struct fib6_table *table;
1935
1936 table = fib6_get_table(dev_net(dev), RT6_TABLE_PREFIX);
1937 if (table == NULL)
1938 return NULL;
1939
1940 read_lock_bh(&table->tb6_lock);
1941 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
1942 if (!fn)
1943 goto out;
1944 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
1945 if (rt->dst.dev->ifindex != dev->ifindex)
1946 continue;
1947 if ((rt->rt6i_flags & flags) != flags)
1948 continue;
1949 if ((rt->rt6i_flags & noflags) != 0)
1950 continue;
1951 dst_hold(&rt->dst);
1952 break;
1953 }
1954 out:
1955 read_unlock_bh(&table->tb6_lock);
1956 return rt;
1957 }
1958
1959
1960 /* Create "default" multicast route to the interface */
1961
1962 static void addrconf_add_mroute(struct net_device *dev)
1963 {
1964 struct fib6_config cfg = {
1965 .fc_table = RT6_TABLE_LOCAL,
1966 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1967 .fc_ifindex = dev->ifindex,
1968 .fc_dst_len = 8,
1969 .fc_flags = RTF_UP,
1970 .fc_nlinfo.nl_net = dev_net(dev),
1971 };
1972
1973 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
1974
1975 ip6_route_add(&cfg);
1976 }
1977
1978 #if IS_ENABLED(CONFIG_IPV6_SIT)
1979 static void sit_route_add(struct net_device *dev)
1980 {
1981 struct fib6_config cfg = {
1982 .fc_table = RT6_TABLE_MAIN,
1983 .fc_metric = IP6_RT_PRIO_ADDRCONF,
1984 .fc_ifindex = dev->ifindex,
1985 .fc_dst_len = 96,
1986 .fc_flags = RTF_UP | RTF_NONEXTHOP,
1987 .fc_nlinfo.nl_net = dev_net(dev),
1988 };
1989
1990 /* prefix length - 96 bits "::d.d.d.d" */
1991 ip6_route_add(&cfg);
1992 }
1993 #endif
1994
1995 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
1996 {
1997 struct inet6_dev *idev;
1998
1999 ASSERT_RTNL();
2000
2001 idev = ipv6_find_idev(dev);
2002 if (!idev)
2003 return ERR_PTR(-ENOBUFS);
2004
2005 if (idev->cnf.disable_ipv6)
2006 return ERR_PTR(-EACCES);
2007
2008 /* Add default multicast route */
2009 if (!(dev->flags & IFF_LOOPBACK))
2010 addrconf_add_mroute(dev);
2011
2012 return idev;
2013 }
2014
2015 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2016 {
2017 struct prefix_info *pinfo;
2018 __u32 valid_lft;
2019 __u32 prefered_lft;
2020 int addr_type;
2021 struct inet6_dev *in6_dev;
2022 struct net *net = dev_net(dev);
2023
2024 pinfo = (struct prefix_info *) opt;
2025
2026 if (len < sizeof(struct prefix_info)) {
2027 ADBG(("addrconf: prefix option too short\n"));
2028 return;
2029 }
2030
2031 /*
2032 * Validation checks ([ADDRCONF], page 19)
2033 */
2034
2035 addr_type = ipv6_addr_type(&pinfo->prefix);
2036
2037 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2038 return;
2039
2040 valid_lft = ntohl(pinfo->valid);
2041 prefered_lft = ntohl(pinfo->prefered);
2042
2043 if (prefered_lft > valid_lft) {
2044 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2045 return;
2046 }
2047
2048 in6_dev = in6_dev_get(dev);
2049
2050 if (in6_dev == NULL) {
2051 net_dbg_ratelimited("addrconf: device %s not configured\n",
2052 dev->name);
2053 return;
2054 }
2055
2056 /*
2057 * Two things going on here:
2058 * 1) Add routes for on-link prefixes
2059 * 2) Configure prefixes with the auto flag set
2060 */
2061
2062 if (pinfo->onlink) {
2063 struct rt6_info *rt;
2064 unsigned long rt_expires;
2065
2066 /* Avoid arithmetic overflow. Really, we could
2067 * save rt_expires in seconds, likely valid_lft,
2068 * but it would require division in fib gc, that it
2069 * not good.
2070 */
2071 if (HZ > USER_HZ)
2072 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2073 else
2074 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2075
2076 if (addrconf_finite_timeout(rt_expires))
2077 rt_expires *= HZ;
2078
2079 rt = addrconf_get_prefix_route(&pinfo->prefix,
2080 pinfo->prefix_len,
2081 dev,
2082 RTF_ADDRCONF | RTF_PREFIX_RT,
2083 RTF_GATEWAY | RTF_DEFAULT);
2084
2085 if (rt) {
2086 /* Autoconf prefix route */
2087 if (valid_lft == 0) {
2088 ip6_del_rt(rt);
2089 rt = NULL;
2090 } else if (addrconf_finite_timeout(rt_expires)) {
2091 /* not infinity */
2092 rt6_set_expires(rt, jiffies + rt_expires);
2093 } else {
2094 rt6_clean_expires(rt);
2095 }
2096 } else if (valid_lft) {
2097 clock_t expires = 0;
2098 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2099 if (addrconf_finite_timeout(rt_expires)) {
2100 /* not infinity */
2101 flags |= RTF_EXPIRES;
2102 expires = jiffies_to_clock_t(rt_expires);
2103 }
2104 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2105 dev, expires, flags);
2106 }
2107 ip6_rt_put(rt);
2108 }
2109
2110 /* Try to figure out our local address for this prefix */
2111
2112 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2113 struct inet6_ifaddr *ifp;
2114 struct in6_addr addr;
2115 int create = 0, update_lft = 0;
2116
2117 if (pinfo->prefix_len == 64) {
2118 memcpy(&addr, &pinfo->prefix, 8);
2119 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2120 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2121 in6_dev_put(in6_dev);
2122 return;
2123 }
2124 goto ok;
2125 }
2126 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2127 pinfo->prefix_len);
2128 in6_dev_put(in6_dev);
2129 return;
2130
2131 ok:
2132
2133 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2134
2135 if (ifp == NULL && valid_lft) {
2136 int max_addresses = in6_dev->cnf.max_addresses;
2137 u32 addr_flags = 0;
2138
2139 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2140 if (in6_dev->cnf.optimistic_dad &&
2141 !net->ipv6.devconf_all->forwarding && sllao)
2142 addr_flags = IFA_F_OPTIMISTIC;
2143 #endif
2144
2145 /* Do not allow to create too much of autoconfigured
2146 * addresses; this would be too easy way to crash kernel.
2147 */
2148 if (!max_addresses ||
2149 ipv6_count_addresses(in6_dev) < max_addresses)
2150 ifp = ipv6_add_addr(in6_dev, &addr, pinfo->prefix_len,
2151 addr_type&IPV6_ADDR_SCOPE_MASK,
2152 addr_flags);
2153
2154 if (IS_ERR_OR_NULL(ifp)) {
2155 in6_dev_put(in6_dev);
2156 return;
2157 }
2158
2159 update_lft = create = 1;
2160 ifp->cstamp = jiffies;
2161 addrconf_dad_start(ifp);
2162 }
2163
2164 if (ifp) {
2165 int flags;
2166 unsigned long now;
2167 #ifdef CONFIG_IPV6_PRIVACY
2168 struct inet6_ifaddr *ift;
2169 #endif
2170 u32 stored_lft;
2171
2172 /* update lifetime (RFC2462 5.5.3 e) */
2173 spin_lock(&ifp->lock);
2174 now = jiffies;
2175 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2176 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2177 else
2178 stored_lft = 0;
2179 if (!update_lft && stored_lft) {
2180 if (valid_lft > MIN_VALID_LIFETIME ||
2181 valid_lft > stored_lft)
2182 update_lft = 1;
2183 else if (stored_lft <= MIN_VALID_LIFETIME) {
2184 /* valid_lft <= stored_lft is always true */
2185 /*
2186 * RFC 4862 Section 5.5.3e:
2187 * "Note that the preferred lifetime of
2188 * the corresponding address is always
2189 * reset to the Preferred Lifetime in
2190 * the received Prefix Information
2191 * option, regardless of whether the
2192 * valid lifetime is also reset or
2193 * ignored."
2194 *
2195 * So if the preferred lifetime in
2196 * this advertisement is different
2197 * than what we have stored, but the
2198 * valid lifetime is invalid, just
2199 * reset prefered_lft.
2200 *
2201 * We must set the valid lifetime
2202 * to the stored lifetime since we'll
2203 * be updating the timestamp below,
2204 * else we'll set it back to the
2205 * minimum.
2206 */
2207 if (prefered_lft != ifp->prefered_lft) {
2208 valid_lft = stored_lft;
2209 update_lft = 1;
2210 }
2211 } else {
2212 valid_lft = MIN_VALID_LIFETIME;
2213 if (valid_lft < prefered_lft)
2214 prefered_lft = valid_lft;
2215 update_lft = 1;
2216 }
2217 }
2218
2219 if (update_lft) {
2220 ifp->valid_lft = valid_lft;
2221 ifp->prefered_lft = prefered_lft;
2222 ifp->tstamp = now;
2223 flags = ifp->flags;
2224 ifp->flags &= ~IFA_F_DEPRECATED;
2225 spin_unlock(&ifp->lock);
2226
2227 if (!(flags&IFA_F_TENTATIVE))
2228 ipv6_ifa_notify(0, ifp);
2229 } else
2230 spin_unlock(&ifp->lock);
2231
2232 #ifdef CONFIG_IPV6_PRIVACY
2233 read_lock_bh(&in6_dev->lock);
2234 /* update all temporary addresses in the list */
2235 list_for_each_entry(ift, &in6_dev->tempaddr_list,
2236 tmp_list) {
2237 int age, max_valid, max_prefered;
2238
2239 if (ifp != ift->ifpub)
2240 continue;
2241
2242 /*
2243 * RFC 4941 section 3.3:
2244 * If a received option will extend the lifetime
2245 * of a public address, the lifetimes of
2246 * temporary addresses should be extended,
2247 * subject to the overall constraint that no
2248 * temporary addresses should ever remain
2249 * "valid" or "preferred" for a time longer than
2250 * (TEMP_VALID_LIFETIME) or
2251 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR),
2252 * respectively.
2253 */
2254 age = (now - ift->cstamp) / HZ;
2255 max_valid = in6_dev->cnf.temp_valid_lft - age;
2256 if (max_valid < 0)
2257 max_valid = 0;
2258
2259 max_prefered = in6_dev->cnf.temp_prefered_lft -
2260 in6_dev->cnf.max_desync_factor -
2261 age;
2262 if (max_prefered < 0)
2263 max_prefered = 0;
2264
2265 if (valid_lft > max_valid)
2266 valid_lft = max_valid;
2267
2268 if (prefered_lft > max_prefered)
2269 prefered_lft = max_prefered;
2270
2271 spin_lock(&ift->lock);
2272 flags = ift->flags;
2273 ift->valid_lft = valid_lft;
2274 ift->prefered_lft = prefered_lft;
2275 ift->tstamp = now;
2276 if (prefered_lft > 0)
2277 ift->flags &= ~IFA_F_DEPRECATED;
2278
2279 spin_unlock(&ift->lock);
2280 if (!(flags&IFA_F_TENTATIVE))
2281 ipv6_ifa_notify(0, ift);
2282 }
2283
2284 if ((create || list_empty(&in6_dev->tempaddr_list)) && in6_dev->cnf.use_tempaddr > 0) {
2285 /*
2286 * When a new public address is created as
2287 * described in [ADDRCONF], also create a new
2288 * temporary address. Also create a temporary
2289 * address if it's enabled but no temporary
2290 * address currently exists.
2291 */
2292 read_unlock_bh(&in6_dev->lock);
2293 ipv6_create_tempaddr(ifp, NULL);
2294 } else {
2295 read_unlock_bh(&in6_dev->lock);
2296 }
2297 #endif
2298 in6_ifa_put(ifp);
2299 addrconf_verify(0);
2300 }
2301 }
2302 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2303 in6_dev_put(in6_dev);
2304 }
2305
2306 /*
2307 * Set destination address.
2308 * Special case for SIT interfaces where we create a new "virtual"
2309 * device.
2310 */
2311 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2312 {
2313 struct in6_ifreq ireq;
2314 struct net_device *dev;
2315 int err = -EINVAL;
2316
2317 rtnl_lock();
2318
2319 err = -EFAULT;
2320 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2321 goto err_exit;
2322
2323 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2324
2325 err = -ENODEV;
2326 if (dev == NULL)
2327 goto err_exit;
2328
2329 #if IS_ENABLED(CONFIG_IPV6_SIT)
2330 if (dev->type == ARPHRD_SIT) {
2331 const struct net_device_ops *ops = dev->netdev_ops;
2332 struct ifreq ifr;
2333 struct ip_tunnel_parm p;
2334
2335 err = -EADDRNOTAVAIL;
2336 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2337 goto err_exit;
2338
2339 memset(&p, 0, sizeof(p));
2340 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2341 p.iph.saddr = 0;
2342 p.iph.version = 4;
2343 p.iph.ihl = 5;
2344 p.iph.protocol = IPPROTO_IPV6;
2345 p.iph.ttl = 64;
2346 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2347
2348 if (ops->ndo_do_ioctl) {
2349 mm_segment_t oldfs = get_fs();
2350
2351 set_fs(KERNEL_DS);
2352 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2353 set_fs(oldfs);
2354 } else
2355 err = -EOPNOTSUPP;
2356
2357 if (err == 0) {
2358 err = -ENOBUFS;
2359 dev = __dev_get_by_name(net, p.name);
2360 if (!dev)
2361 goto err_exit;
2362 err = dev_open(dev);
2363 }
2364 }
2365 #endif
2366
2367 err_exit:
2368 rtnl_unlock();
2369 return err;
2370 }
2371
2372 /*
2373 * Manual configuration of address on an interface
2374 */
2375 static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
2376 unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
2377 __u32 valid_lft)
2378 {
2379 struct inet6_ifaddr *ifp;
2380 struct inet6_dev *idev;
2381 struct net_device *dev;
2382 int scope;
2383 u32 flags;
2384 clock_t expires;
2385 unsigned long timeout;
2386
2387 ASSERT_RTNL();
2388
2389 if (plen > 128)
2390 return -EINVAL;
2391
2392 /* check the lifetime */
2393 if (!valid_lft || prefered_lft > valid_lft)
2394 return -EINVAL;
2395
2396 dev = __dev_get_by_index(net, ifindex);
2397 if (!dev)
2398 return -ENODEV;
2399
2400 idev = addrconf_add_dev(dev);
2401 if (IS_ERR(idev))
2402 return PTR_ERR(idev);
2403
2404 scope = ipv6_addr_scope(pfx);
2405
2406 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2407 if (addrconf_finite_timeout(timeout)) {
2408 expires = jiffies_to_clock_t(timeout * HZ);
2409 valid_lft = timeout;
2410 flags = RTF_EXPIRES;
2411 } else {
2412 expires = 0;
2413 flags = 0;
2414 ifa_flags |= IFA_F_PERMANENT;
2415 }
2416
2417 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2418 if (addrconf_finite_timeout(timeout)) {
2419 if (timeout == 0)
2420 ifa_flags |= IFA_F_DEPRECATED;
2421 prefered_lft = timeout;
2422 }
2423
2424 ifp = ipv6_add_addr(idev, pfx, plen, scope, ifa_flags);
2425
2426 if (!IS_ERR(ifp)) {
2427 spin_lock_bh(&ifp->lock);
2428 ifp->valid_lft = valid_lft;
2429 ifp->prefered_lft = prefered_lft;
2430 ifp->tstamp = jiffies;
2431 spin_unlock_bh(&ifp->lock);
2432
2433 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2434 expires, flags);
2435 /*
2436 * Note that section 3.1 of RFC 4429 indicates
2437 * that the Optimistic flag should not be set for
2438 * manually configured addresses
2439 */
2440 addrconf_dad_start(ifp);
2441 in6_ifa_put(ifp);
2442 addrconf_verify(0);
2443 return 0;
2444 }
2445
2446 return PTR_ERR(ifp);
2447 }
2448
2449 static int inet6_addr_del(struct net *net, int ifindex, const struct in6_addr *pfx,
2450 unsigned int plen)
2451 {
2452 struct inet6_ifaddr *ifp;
2453 struct inet6_dev *idev;
2454 struct net_device *dev;
2455
2456 if (plen > 128)
2457 return -EINVAL;
2458
2459 dev = __dev_get_by_index(net, ifindex);
2460 if (!dev)
2461 return -ENODEV;
2462
2463 if ((idev = __in6_dev_get(dev)) == NULL)
2464 return -ENXIO;
2465
2466 read_lock_bh(&idev->lock);
2467 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2468 if (ifp->prefix_len == plen &&
2469 ipv6_addr_equal(pfx, &ifp->addr)) {
2470 in6_ifa_hold(ifp);
2471 read_unlock_bh(&idev->lock);
2472
2473 ipv6_del_addr(ifp);
2474
2475 /* If the last address is deleted administratively,
2476 disable IPv6 on this interface.
2477 */
2478 if (list_empty(&idev->addr_list))
2479 addrconf_ifdown(idev->dev, 1);
2480 return 0;
2481 }
2482 }
2483 read_unlock_bh(&idev->lock);
2484 return -EADDRNOTAVAIL;
2485 }
2486
2487
2488 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2489 {
2490 struct in6_ifreq ireq;
2491 int err;
2492
2493 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2494 return -EPERM;
2495
2496 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2497 return -EFAULT;
2498
2499 rtnl_lock();
2500 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2501 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2502 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2503 rtnl_unlock();
2504 return err;
2505 }
2506
2507 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2508 {
2509 struct in6_ifreq ireq;
2510 int err;
2511
2512 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2513 return -EPERM;
2514
2515 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2516 return -EFAULT;
2517
2518 rtnl_lock();
2519 err = inet6_addr_del(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
2520 ireq.ifr6_prefixlen);
2521 rtnl_unlock();
2522 return err;
2523 }
2524
2525 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2526 int plen, int scope)
2527 {
2528 struct inet6_ifaddr *ifp;
2529
2530 ifp = ipv6_add_addr(idev, addr, plen, scope, IFA_F_PERMANENT);
2531 if (!IS_ERR(ifp)) {
2532 spin_lock_bh(&ifp->lock);
2533 ifp->flags &= ~IFA_F_TENTATIVE;
2534 spin_unlock_bh(&ifp->lock);
2535 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2536 in6_ifa_put(ifp);
2537 }
2538 }
2539
2540 #if IS_ENABLED(CONFIG_IPV6_SIT)
2541 static void sit_add_v4_addrs(struct inet6_dev *idev)
2542 {
2543 struct in6_addr addr;
2544 struct net_device *dev;
2545 struct net *net = dev_net(idev->dev);
2546 int scope;
2547
2548 ASSERT_RTNL();
2549
2550 memset(&addr, 0, sizeof(struct in6_addr));
2551 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2552
2553 if (idev->dev->flags&IFF_POINTOPOINT) {
2554 addr.s6_addr32[0] = htonl(0xfe800000);
2555 scope = IFA_LINK;
2556 } else {
2557 scope = IPV6_ADDR_COMPATv4;
2558 }
2559
2560 if (addr.s6_addr32[3]) {
2561 add_addr(idev, &addr, 128, scope);
2562 return;
2563 }
2564
2565 for_each_netdev(net, dev) {
2566 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2567 if (in_dev && (dev->flags & IFF_UP)) {
2568 struct in_ifaddr *ifa;
2569
2570 int flag = scope;
2571
2572 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2573 int plen;
2574
2575 addr.s6_addr32[3] = ifa->ifa_local;
2576
2577 if (ifa->ifa_scope == RT_SCOPE_LINK)
2578 continue;
2579 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2580 if (idev->dev->flags&IFF_POINTOPOINT)
2581 continue;
2582 flag |= IFA_HOST;
2583 }
2584 if (idev->dev->flags&IFF_POINTOPOINT)
2585 plen = 64;
2586 else
2587 plen = 96;
2588
2589 add_addr(idev, &addr, plen, flag);
2590 }
2591 }
2592 }
2593 }
2594 #endif
2595
2596 static void init_loopback(struct net_device *dev)
2597 {
2598 struct inet6_dev *idev;
2599
2600 /* ::1 */
2601
2602 ASSERT_RTNL();
2603
2604 if ((idev = ipv6_find_idev(dev)) == NULL) {
2605 pr_debug("%s: add_dev failed\n", __func__);
2606 return;
2607 }
2608
2609 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2610 }
2611
2612 static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr *addr)
2613 {
2614 struct inet6_ifaddr *ifp;
2615 u32 addr_flags = IFA_F_PERMANENT;
2616
2617 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2618 if (idev->cnf.optimistic_dad &&
2619 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2620 addr_flags |= IFA_F_OPTIMISTIC;
2621 #endif
2622
2623
2624 ifp = ipv6_add_addr(idev, addr, 64, IFA_LINK, addr_flags);
2625 if (!IS_ERR(ifp)) {
2626 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2627 addrconf_dad_start(ifp);
2628 in6_ifa_put(ifp);
2629 }
2630 }
2631
2632 static void addrconf_dev_config(struct net_device *dev)
2633 {
2634 struct in6_addr addr;
2635 struct inet6_dev *idev;
2636
2637 ASSERT_RTNL();
2638
2639 if ((dev->type != ARPHRD_ETHER) &&
2640 (dev->type != ARPHRD_FDDI) &&
2641 (dev->type != ARPHRD_ARCNET) &&
2642 (dev->type != ARPHRD_INFINIBAND) &&
2643 (dev->type != ARPHRD_IEEE802154)) {
2644 /* Alas, we support only Ethernet autoconfiguration. */
2645 return;
2646 }
2647
2648 idev = addrconf_add_dev(dev);
2649 if (IS_ERR(idev))
2650 return;
2651
2652 memset(&addr, 0, sizeof(struct in6_addr));
2653 addr.s6_addr32[0] = htonl(0xFE800000);
2654
2655 if (ipv6_generate_eui64(addr.s6_addr + 8, dev) == 0)
2656 addrconf_add_linklocal(idev, &addr);
2657 }
2658
2659 #if IS_ENABLED(CONFIG_IPV6_SIT)
2660 static void addrconf_sit_config(struct net_device *dev)
2661 {
2662 struct inet6_dev *idev;
2663
2664 ASSERT_RTNL();
2665
2666 /*
2667 * Configure the tunnel with one of our IPv4
2668 * addresses... we should configure all of
2669 * our v4 addrs in the tunnel
2670 */
2671
2672 if ((idev = ipv6_find_idev(dev)) == NULL) {
2673 pr_debug("%s: add_dev failed\n", __func__);
2674 return;
2675 }
2676
2677 if (dev->priv_flags & IFF_ISATAP) {
2678 struct in6_addr addr;
2679
2680 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2681 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2682 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2683 addrconf_add_linklocal(idev, &addr);
2684 return;
2685 }
2686
2687 sit_add_v4_addrs(idev);
2688
2689 if (dev->flags&IFF_POINTOPOINT)
2690 addrconf_add_mroute(dev);
2691 else
2692 sit_route_add(dev);
2693 }
2694 #endif
2695
2696 #if IS_ENABLED(CONFIG_NET_IPGRE)
2697 static void addrconf_gre_config(struct net_device *dev)
2698 {
2699 struct inet6_dev *idev;
2700 struct in6_addr addr;
2701
2702 pr_info("%s(%s)\n", __func__, dev->name);
2703
2704 ASSERT_RTNL();
2705
2706 if ((idev = ipv6_find_idev(dev)) == NULL) {
2707 pr_debug("%s: add_dev failed\n", __func__);
2708 return;
2709 }
2710
2711 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
2712 addrconf_prefix_route(&addr, 64, dev, 0, 0);
2713
2714 if (!ipv6_generate_eui64(addr.s6_addr + 8, dev))
2715 addrconf_add_linklocal(idev, &addr);
2716 }
2717 #endif
2718
2719 static inline int
2720 ipv6_inherit_linklocal(struct inet6_dev *idev, struct net_device *link_dev)
2721 {
2722 struct in6_addr lladdr;
2723
2724 if (!ipv6_get_lladdr(link_dev, &lladdr, IFA_F_TENTATIVE)) {
2725 addrconf_add_linklocal(idev, &lladdr);
2726 return 0;
2727 }
2728 return -1;
2729 }
2730
2731 static void ip6_tnl_add_linklocal(struct inet6_dev *idev)
2732 {
2733 struct net_device *link_dev;
2734 struct net *net = dev_net(idev->dev);
2735
2736 /* first try to inherit the link-local address from the link device */
2737 if (idev->dev->iflink &&
2738 (link_dev = __dev_get_by_index(net, idev->dev->iflink))) {
2739 if (!ipv6_inherit_linklocal(idev, link_dev))
2740 return;
2741 }
2742 /* then try to inherit it from any device */
2743 for_each_netdev(net, link_dev) {
2744 if (!ipv6_inherit_linklocal(idev, link_dev))
2745 return;
2746 }
2747 pr_debug("init ip6-ip6: add_linklocal failed\n");
2748 }
2749
2750 /*
2751 * Autoconfigure tunnel with a link-local address so routing protocols,
2752 * DHCPv6, MLD etc. can be run over the virtual link
2753 */
2754
2755 static void addrconf_ip6_tnl_config(struct net_device *dev)
2756 {
2757 struct inet6_dev *idev;
2758
2759 ASSERT_RTNL();
2760
2761 idev = addrconf_add_dev(dev);
2762 if (IS_ERR(idev)) {
2763 pr_debug("init ip6-ip6: add_dev failed\n");
2764 return;
2765 }
2766 ip6_tnl_add_linklocal(idev);
2767 }
2768
2769 static int addrconf_notify(struct notifier_block *this, unsigned long event,
2770 void *data)
2771 {
2772 struct net_device *dev = (struct net_device *) data;
2773 struct inet6_dev *idev = __in6_dev_get(dev);
2774 int run_pending = 0;
2775 int err;
2776
2777 switch (event) {
2778 case NETDEV_REGISTER:
2779 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2780 idev = ipv6_add_dev(dev);
2781 if (!idev)
2782 return notifier_from_errno(-ENOMEM);
2783 }
2784 break;
2785
2786 case NETDEV_UP:
2787 case NETDEV_CHANGE:
2788 if (dev->flags & IFF_SLAVE)
2789 break;
2790
2791 if (event == NETDEV_UP) {
2792 if (!addrconf_qdisc_ok(dev)) {
2793 /* device is not ready yet. */
2794 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
2795 dev->name);
2796 break;
2797 }
2798
2799 if (!idev && dev->mtu >= IPV6_MIN_MTU)
2800 idev = ipv6_add_dev(dev);
2801
2802 if (idev) {
2803 idev->if_flags |= IF_READY;
2804 run_pending = 1;
2805 }
2806 } else {
2807 if (!addrconf_qdisc_ok(dev)) {
2808 /* device is still not ready. */
2809 break;
2810 }
2811
2812 if (idev) {
2813 if (idev->if_flags & IF_READY)
2814 /* device is already configured. */
2815 break;
2816 idev->if_flags |= IF_READY;
2817 }
2818
2819 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
2820 dev->name);
2821
2822 run_pending = 1;
2823 }
2824
2825 switch (dev->type) {
2826 #if IS_ENABLED(CONFIG_IPV6_SIT)
2827 case ARPHRD_SIT:
2828 addrconf_sit_config(dev);
2829 break;
2830 #endif
2831 #if IS_ENABLED(CONFIG_NET_IPGRE)
2832 case ARPHRD_IPGRE:
2833 addrconf_gre_config(dev);
2834 break;
2835 #endif
2836 case ARPHRD_TUNNEL6:
2837 addrconf_ip6_tnl_config(dev);
2838 break;
2839 case ARPHRD_LOOPBACK:
2840 init_loopback(dev);
2841 break;
2842
2843 default:
2844 addrconf_dev_config(dev);
2845 break;
2846 }
2847
2848 if (idev) {
2849 if (run_pending)
2850 addrconf_dad_run(idev);
2851
2852 /*
2853 * If the MTU changed during the interface down,
2854 * when the interface up, the changed MTU must be
2855 * reflected in the idev as well as routers.
2856 */
2857 if (idev->cnf.mtu6 != dev->mtu &&
2858 dev->mtu >= IPV6_MIN_MTU) {
2859 rt6_mtu_change(dev, dev->mtu);
2860 idev->cnf.mtu6 = dev->mtu;
2861 }
2862 idev->tstamp = jiffies;
2863 inet6_ifinfo_notify(RTM_NEWLINK, idev);
2864
2865 /*
2866 * If the changed mtu during down is lower than
2867 * IPV6_MIN_MTU stop IPv6 on this interface.
2868 */
2869 if (dev->mtu < IPV6_MIN_MTU)
2870 addrconf_ifdown(dev, 1);
2871 }
2872 break;
2873
2874 case NETDEV_CHANGEMTU:
2875 if (idev && dev->mtu >= IPV6_MIN_MTU) {
2876 rt6_mtu_change(dev, dev->mtu);
2877 idev->cnf.mtu6 = dev->mtu;
2878 break;
2879 }
2880
2881 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
2882 idev = ipv6_add_dev(dev);
2883 if (idev)
2884 break;
2885 }
2886
2887 /*
2888 * MTU falled under IPV6_MIN_MTU.
2889 * Stop IPv6 on this interface.
2890 */
2891
2892 case NETDEV_DOWN:
2893 case NETDEV_UNREGISTER:
2894 /*
2895 * Remove all addresses from this interface.
2896 */
2897 addrconf_ifdown(dev, event != NETDEV_DOWN);
2898 break;
2899
2900 case NETDEV_CHANGENAME:
2901 if (idev) {
2902 snmp6_unregister_dev(idev);
2903 addrconf_sysctl_unregister(idev);
2904 addrconf_sysctl_register(idev);
2905 err = snmp6_register_dev(idev);
2906 if (err)
2907 return notifier_from_errno(err);
2908 }
2909 break;
2910
2911 case NETDEV_PRE_TYPE_CHANGE:
2912 case NETDEV_POST_TYPE_CHANGE:
2913 addrconf_type_change(dev, event);
2914 break;
2915 }
2916
2917 return NOTIFY_OK;
2918 }
2919
2920 /*
2921 * addrconf module should be notified of a device going up
2922 */
2923 static struct notifier_block ipv6_dev_notf = {
2924 .notifier_call = addrconf_notify,
2925 };
2926
2927 static void addrconf_type_change(struct net_device *dev, unsigned long event)
2928 {
2929 struct inet6_dev *idev;
2930 ASSERT_RTNL();
2931
2932 idev = __in6_dev_get(dev);
2933
2934 if (event == NETDEV_POST_TYPE_CHANGE)
2935 ipv6_mc_remap(idev);
2936 else if (event == NETDEV_PRE_TYPE_CHANGE)
2937 ipv6_mc_unmap(idev);
2938 }
2939
2940 static int addrconf_ifdown(struct net_device *dev, int how)
2941 {
2942 struct net *net = dev_net(dev);
2943 struct inet6_dev *idev;
2944 struct inet6_ifaddr *ifa;
2945 int state, i;
2946
2947 ASSERT_RTNL();
2948
2949 rt6_ifdown(net, dev);
2950 neigh_ifdown(&nd_tbl, dev);
2951
2952 idev = __in6_dev_get(dev);
2953 if (idev == NULL)
2954 return -ENODEV;
2955
2956 /*
2957 * Step 1: remove reference to ipv6 device from parent device.
2958 * Do not dev_put!
2959 */
2960 if (how) {
2961 idev->dead = 1;
2962
2963 /* protected by rtnl_lock */
2964 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
2965
2966 /* Step 1.5: remove snmp6 entry */
2967 snmp6_unregister_dev(idev);
2968
2969 }
2970
2971 /* Step 2: clear hash table */
2972 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
2973 struct hlist_head *h = &inet6_addr_lst[i];
2974
2975 spin_lock_bh(&addrconf_hash_lock);
2976 restart:
2977 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
2978 if (ifa->idev == idev) {
2979 hlist_del_init_rcu(&ifa->addr_lst);
2980 addrconf_del_timer(ifa);
2981 goto restart;
2982 }
2983 }
2984 spin_unlock_bh(&addrconf_hash_lock);
2985 }
2986
2987 write_lock_bh(&idev->lock);
2988
2989 /* Step 2: clear flags for stateless addrconf */
2990 if (!how)
2991 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
2992
2993 #ifdef CONFIG_IPV6_PRIVACY
2994 if (how && del_timer(&idev->regen_timer))
2995 in6_dev_put(idev);
2996
2997 /* Step 3: clear tempaddr list */
2998 while (!list_empty(&idev->tempaddr_list)) {
2999 ifa = list_first_entry(&idev->tempaddr_list,
3000 struct inet6_ifaddr, tmp_list);
3001 list_del(&ifa->tmp_list);
3002 write_unlock_bh(&idev->lock);
3003 spin_lock_bh(&ifa->lock);
3004
3005 if (ifa->ifpub) {
3006 in6_ifa_put(ifa->ifpub);
3007 ifa->ifpub = NULL;
3008 }
3009 spin_unlock_bh(&ifa->lock);
3010 in6_ifa_put(ifa);
3011 write_lock_bh(&idev->lock);
3012 }
3013 #endif
3014
3015 while (!list_empty(&idev->addr_list)) {
3016 ifa = list_first_entry(&idev->addr_list,
3017 struct inet6_ifaddr, if_list);
3018 addrconf_del_timer(ifa);
3019
3020 list_del(&ifa->if_list);
3021
3022 write_unlock_bh(&idev->lock);
3023
3024 spin_lock_bh(&ifa->state_lock);
3025 state = ifa->state;
3026 ifa->state = INET6_IFADDR_STATE_DEAD;
3027 spin_unlock_bh(&ifa->state_lock);
3028
3029 if (state != INET6_IFADDR_STATE_DEAD) {
3030 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3031 atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifa);
3032 }
3033 in6_ifa_put(ifa);
3034
3035 write_lock_bh(&idev->lock);
3036 }
3037
3038 write_unlock_bh(&idev->lock);
3039
3040 /* Step 5: Discard multicast list */
3041 if (how)
3042 ipv6_mc_destroy_dev(idev);
3043 else
3044 ipv6_mc_down(idev);
3045
3046 idev->tstamp = jiffies;
3047
3048 /* Last: Shot the device (if unregistered) */
3049 if (how) {
3050 addrconf_sysctl_unregister(idev);
3051 neigh_parms_release(&nd_tbl, idev->nd_parms);
3052 neigh_ifdown(&nd_tbl, dev);
3053 in6_dev_put(idev);
3054 }
3055 return 0;
3056 }
3057
3058 static void addrconf_rs_timer(unsigned long data)
3059 {
3060 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3061 struct inet6_dev *idev = ifp->idev;
3062
3063 read_lock(&idev->lock);
3064 if (idev->dead || !(idev->if_flags & IF_READY))
3065 goto out;
3066
3067 if (!ipv6_accept_ra(idev))
3068 goto out;
3069
3070 /* Announcement received after solicitation was sent */
3071 if (idev->if_flags & IF_RA_RCVD)
3072 goto out;
3073
3074 spin_lock(&ifp->lock);
3075 if (ifp->probes++ < idev->cnf.rtr_solicits) {
3076 /* The wait after the last probe can be shorter */
3077 addrconf_mod_timer(ifp, AC_RS,
3078 (ifp->probes == idev->cnf.rtr_solicits) ?
3079 idev->cnf.rtr_solicit_delay :
3080 idev->cnf.rtr_solicit_interval);
3081 spin_unlock(&ifp->lock);
3082
3083 ndisc_send_rs(idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3084 } else {
3085 spin_unlock(&ifp->lock);
3086 /*
3087 * Note: we do not support deprecated "all on-link"
3088 * assumption any longer.
3089 */
3090 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3091 }
3092
3093 out:
3094 read_unlock(&idev->lock);
3095 in6_ifa_put(ifp);
3096 }
3097
3098 /*
3099 * Duplicate Address Detection
3100 */
3101 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3102 {
3103 unsigned long rand_num;
3104 struct inet6_dev *idev = ifp->idev;
3105
3106 if (ifp->flags & IFA_F_OPTIMISTIC)
3107 rand_num = 0;
3108 else
3109 rand_num = net_random() % (idev->cnf.rtr_solicit_delay ? : 1);
3110
3111 ifp->probes = idev->cnf.dad_transmits;
3112 addrconf_mod_timer(ifp, AC_DAD, rand_num);
3113 }
3114
3115 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3116 {
3117 struct inet6_dev *idev = ifp->idev;
3118 struct net_device *dev = idev->dev;
3119
3120 addrconf_join_solict(dev, &ifp->addr);
3121
3122 net_srandom(ifp->addr.s6_addr32[3]);
3123
3124 read_lock_bh(&idev->lock);
3125 spin_lock(&ifp->lock);
3126 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3127 goto out;
3128
3129 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3130 idev->cnf.accept_dad < 1 ||
3131 !(ifp->flags&IFA_F_TENTATIVE) ||
3132 ifp->flags & IFA_F_NODAD) {
3133 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3134 spin_unlock(&ifp->lock);
3135 read_unlock_bh(&idev->lock);
3136
3137 addrconf_dad_completed(ifp);
3138 return;
3139 }
3140
3141 if (!(idev->if_flags & IF_READY)) {
3142 spin_unlock(&ifp->lock);
3143 read_unlock_bh(&idev->lock);
3144 /*
3145 * If the device is not ready:
3146 * - keep it tentative if it is a permanent address.
3147 * - otherwise, kill it.
3148 */
3149 in6_ifa_hold(ifp);
3150 addrconf_dad_stop(ifp, 0);
3151 return;
3152 }
3153
3154 /*
3155 * Optimistic nodes can start receiving
3156 * Frames right away
3157 */
3158 if (ifp->flags & IFA_F_OPTIMISTIC)
3159 ip6_ins_rt(ifp->rt);
3160
3161 addrconf_dad_kick(ifp);
3162 out:
3163 spin_unlock(&ifp->lock);
3164 read_unlock_bh(&idev->lock);
3165 }
3166
3167 static void addrconf_dad_timer(unsigned long data)
3168 {
3169 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *) data;
3170 struct inet6_dev *idev = ifp->idev;
3171 struct in6_addr mcaddr;
3172
3173 if (!ifp->probes && addrconf_dad_end(ifp))
3174 goto out;
3175
3176 read_lock(&idev->lock);
3177 if (idev->dead || !(idev->if_flags & IF_READY)) {
3178 read_unlock(&idev->lock);
3179 goto out;
3180 }
3181
3182 spin_lock(&ifp->lock);
3183 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3184 spin_unlock(&ifp->lock);
3185 read_unlock(&idev->lock);
3186 goto out;
3187 }
3188
3189 if (ifp->probes == 0) {
3190 /*
3191 * DAD was successful
3192 */
3193
3194 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3195 spin_unlock(&ifp->lock);
3196 read_unlock(&idev->lock);
3197
3198 addrconf_dad_completed(ifp);
3199
3200 goto out;
3201 }
3202
3203 ifp->probes--;
3204 addrconf_mod_timer(ifp, AC_DAD, ifp->idev->nd_parms->retrans_time);
3205 spin_unlock(&ifp->lock);
3206 read_unlock(&idev->lock);
3207
3208 /* send a neighbour solicitation for our addr */
3209 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3210 ndisc_send_ns(ifp->idev->dev, NULL, &ifp->addr, &mcaddr, &in6addr_any);
3211 out:
3212 in6_ifa_put(ifp);
3213 }
3214
3215 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3216 {
3217 struct net_device *dev = ifp->idev->dev;
3218
3219 /*
3220 * Configure the address for reception. Now it is valid.
3221 */
3222
3223 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3224
3225 /* If added prefix is link local and we are prepared to process
3226 router advertisements, start sending router solicitations.
3227 */
3228
3229 if (ipv6_accept_ra(ifp->idev) &&
3230 ifp->idev->cnf.rtr_solicits > 0 &&
3231 (dev->flags&IFF_LOOPBACK) == 0 &&
3232 (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)) {
3233 /*
3234 * If a host as already performed a random delay
3235 * [...] as part of DAD [...] there is no need
3236 * to delay again before sending the first RS
3237 */
3238 ndisc_send_rs(ifp->idev->dev, &ifp->addr, &in6addr_linklocal_allrouters);
3239
3240 spin_lock_bh(&ifp->lock);
3241 ifp->probes = 1;
3242 ifp->idev->if_flags |= IF_RS_SENT;
3243 addrconf_mod_timer(ifp, AC_RS, ifp->idev->cnf.rtr_solicit_interval);
3244 spin_unlock_bh(&ifp->lock);
3245 }
3246 }
3247
3248 static void addrconf_dad_run(struct inet6_dev *idev)
3249 {
3250 struct inet6_ifaddr *ifp;
3251
3252 read_lock_bh(&idev->lock);
3253 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3254 spin_lock(&ifp->lock);
3255 if (ifp->flags & IFA_F_TENTATIVE &&
3256 ifp->state == INET6_IFADDR_STATE_DAD)
3257 addrconf_dad_kick(ifp);
3258 spin_unlock(&ifp->lock);
3259 }
3260 read_unlock_bh(&idev->lock);
3261 }
3262
3263 #ifdef CONFIG_PROC_FS
3264 struct if6_iter_state {
3265 struct seq_net_private p;
3266 int bucket;
3267 int offset;
3268 };
3269
3270 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3271 {
3272 struct inet6_ifaddr *ifa = NULL;
3273 struct if6_iter_state *state = seq->private;
3274 struct net *net = seq_file_net(seq);
3275 int p = 0;
3276
3277 /* initial bucket if pos is 0 */
3278 if (pos == 0) {
3279 state->bucket = 0;
3280 state->offset = 0;
3281 }
3282
3283 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3284 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3285 addr_lst) {
3286 if (!net_eq(dev_net(ifa->idev->dev), net))
3287 continue;
3288 /* sync with offset */
3289 if (p < state->offset) {
3290 p++;
3291 continue;
3292 }
3293 state->offset++;
3294 return ifa;
3295 }
3296
3297 /* prepare for next bucket */
3298 state->offset = 0;
3299 p = 0;
3300 }
3301 return NULL;
3302 }
3303
3304 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3305 struct inet6_ifaddr *ifa)
3306 {
3307 struct if6_iter_state *state = seq->private;
3308 struct net *net = seq_file_net(seq);
3309
3310 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3311 if (!net_eq(dev_net(ifa->idev->dev), net))
3312 continue;
3313 state->offset++;
3314 return ifa;
3315 }
3316
3317 while (++state->bucket < IN6_ADDR_HSIZE) {
3318 state->offset = 0;
3319 hlist_for_each_entry_rcu_bh(ifa,
3320 &inet6_addr_lst[state->bucket], addr_lst) {
3321 if (!net_eq(dev_net(ifa->idev->dev), net))
3322 continue;
3323 state->offset++;
3324 return ifa;
3325 }
3326 }
3327
3328 return NULL;
3329 }
3330
3331 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3332 __acquires(rcu_bh)
3333 {
3334 rcu_read_lock_bh();
3335 return if6_get_first(seq, *pos);
3336 }
3337
3338 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3339 {
3340 struct inet6_ifaddr *ifa;
3341
3342 ifa = if6_get_next(seq, v);
3343 ++*pos;
3344 return ifa;
3345 }
3346
3347 static void if6_seq_stop(struct seq_file *seq, void *v)
3348 __releases(rcu_bh)
3349 {
3350 rcu_read_unlock_bh();
3351 }
3352
3353 static int if6_seq_show(struct seq_file *seq, void *v)
3354 {
3355 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3356 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3357 &ifp->addr,
3358 ifp->idev->dev->ifindex,
3359 ifp->prefix_len,
3360 ifp->scope,
3361 ifp->flags,
3362 ifp->idev->dev->name);
3363 return 0;
3364 }
3365
3366 static const struct seq_operations if6_seq_ops = {
3367 .start = if6_seq_start,
3368 .next = if6_seq_next,
3369 .show = if6_seq_show,
3370 .stop = if6_seq_stop,
3371 };
3372
3373 static int if6_seq_open(struct inode *inode, struct file *file)
3374 {
3375 return seq_open_net(inode, file, &if6_seq_ops,
3376 sizeof(struct if6_iter_state));
3377 }
3378
3379 static const struct file_operations if6_fops = {
3380 .owner = THIS_MODULE,
3381 .open = if6_seq_open,
3382 .read = seq_read,
3383 .llseek = seq_lseek,
3384 .release = seq_release_net,
3385 };
3386
3387 static int __net_init if6_proc_net_init(struct net *net)
3388 {
3389 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3390 return -ENOMEM;
3391 return 0;
3392 }
3393
3394 static void __net_exit if6_proc_net_exit(struct net *net)
3395 {
3396 remove_proc_entry("if_inet6", net->proc_net);
3397 }
3398
3399 static struct pernet_operations if6_proc_net_ops = {
3400 .init = if6_proc_net_init,
3401 .exit = if6_proc_net_exit,
3402 };
3403
3404 int __init if6_proc_init(void)
3405 {
3406 return register_pernet_subsys(&if6_proc_net_ops);
3407 }
3408
3409 void if6_proc_exit(void)
3410 {
3411 unregister_pernet_subsys(&if6_proc_net_ops);
3412 }
3413 #endif /* CONFIG_PROC_FS */
3414
3415 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3416 /* Check if address is a home address configured on any interface. */
3417 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3418 {
3419 int ret = 0;
3420 struct inet6_ifaddr *ifp = NULL;
3421 unsigned int hash = inet6_addr_hash(addr);
3422
3423 rcu_read_lock_bh();
3424 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3425 if (!net_eq(dev_net(ifp->idev->dev), net))
3426 continue;
3427 if (ipv6_addr_equal(&ifp->addr, addr) &&
3428 (ifp->flags & IFA_F_HOMEADDRESS)) {
3429 ret = 1;
3430 break;
3431 }
3432 }
3433 rcu_read_unlock_bh();
3434 return ret;
3435 }
3436 #endif
3437
3438 /*
3439 * Periodic address status verification
3440 */
3441
3442 static void addrconf_verify(unsigned long foo)
3443 {
3444 unsigned long now, next, next_sec, next_sched;
3445 struct inet6_ifaddr *ifp;
3446 int i;
3447
3448 rcu_read_lock_bh();
3449 spin_lock(&addrconf_verify_lock);
3450 now = jiffies;
3451 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3452
3453 del_timer(&addr_chk_timer);
3454
3455 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3456 restart:
3457 hlist_for_each_entry_rcu_bh(ifp,
3458 &inet6_addr_lst[i], addr_lst) {
3459 unsigned long age;
3460
3461 if (ifp->flags & IFA_F_PERMANENT)
3462 continue;
3463
3464 spin_lock(&ifp->lock);
3465 /* We try to batch several events at once. */
3466 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3467
3468 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3469 age >= ifp->valid_lft) {
3470 spin_unlock(&ifp->lock);
3471 in6_ifa_hold(ifp);
3472 ipv6_del_addr(ifp);
3473 goto restart;
3474 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3475 spin_unlock(&ifp->lock);
3476 continue;
3477 } else if (age >= ifp->prefered_lft) {
3478 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3479 int deprecate = 0;
3480
3481 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3482 deprecate = 1;
3483 ifp->flags |= IFA_F_DEPRECATED;
3484 }
3485
3486 if (time_before(ifp->tstamp + ifp->valid_lft * HZ, next))
3487 next = ifp->tstamp + ifp->valid_lft * HZ;
3488
3489 spin_unlock(&ifp->lock);
3490
3491 if (deprecate) {
3492 in6_ifa_hold(ifp);
3493
3494 ipv6_ifa_notify(0, ifp);
3495 in6_ifa_put(ifp);
3496 goto restart;
3497 }
3498 #ifdef CONFIG_IPV6_PRIVACY
3499 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3500 !(ifp->flags&IFA_F_TENTATIVE)) {
3501 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3502 ifp->idev->cnf.dad_transmits *
3503 ifp->idev->nd_parms->retrans_time / HZ;
3504
3505 if (age >= ifp->prefered_lft - regen_advance) {
3506 struct inet6_ifaddr *ifpub = ifp->ifpub;
3507 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3508 next = ifp->tstamp + ifp->prefered_lft * HZ;
3509 if (!ifp->regen_count && ifpub) {
3510 ifp->regen_count++;
3511 in6_ifa_hold(ifp);
3512 in6_ifa_hold(ifpub);
3513 spin_unlock(&ifp->lock);
3514
3515 spin_lock(&ifpub->lock);
3516 ifpub->regen_count = 0;
3517 spin_unlock(&ifpub->lock);
3518 ipv6_create_tempaddr(ifpub, ifp);
3519 in6_ifa_put(ifpub);
3520 in6_ifa_put(ifp);
3521 goto restart;
3522 }
3523 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3524 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3525 spin_unlock(&ifp->lock);
3526 #endif
3527 } else {
3528 /* ifp->prefered_lft <= ifp->valid_lft */
3529 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3530 next = ifp->tstamp + ifp->prefered_lft * HZ;
3531 spin_unlock(&ifp->lock);
3532 }
3533 }
3534 }
3535
3536 next_sec = round_jiffies_up(next);
3537 next_sched = next;
3538
3539 /* If rounded timeout is accurate enough, accept it. */
3540 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
3541 next_sched = next_sec;
3542
3543 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
3544 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
3545 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
3546
3547 ADBG((KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
3548 now, next, next_sec, next_sched));
3549
3550 addr_chk_timer.expires = next_sched;
3551 add_timer(&addr_chk_timer);
3552 spin_unlock(&addrconf_verify_lock);
3553 rcu_read_unlock_bh();
3554 }
3555
3556 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
3557 {
3558 struct in6_addr *pfx = NULL;
3559
3560 if (addr)
3561 pfx = nla_data(addr);
3562
3563 if (local) {
3564 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
3565 pfx = NULL;
3566 else
3567 pfx = nla_data(local);
3568 }
3569
3570 return pfx;
3571 }
3572
3573 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
3574 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
3575 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
3576 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
3577 };
3578
3579 static int
3580 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
3581 {
3582 struct net *net = sock_net(skb->sk);
3583 struct ifaddrmsg *ifm;
3584 struct nlattr *tb[IFA_MAX+1];
3585 struct in6_addr *pfx;
3586 int err;
3587
3588 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3589 if (err < 0)
3590 return err;
3591
3592 ifm = nlmsg_data(nlh);
3593 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3594 if (pfx == NULL)
3595 return -EINVAL;
3596
3597 return inet6_addr_del(net, ifm->ifa_index, pfx, ifm->ifa_prefixlen);
3598 }
3599
3600 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u8 ifa_flags,
3601 u32 prefered_lft, u32 valid_lft)
3602 {
3603 u32 flags;
3604 clock_t expires;
3605 unsigned long timeout;
3606
3607 if (!valid_lft || (prefered_lft > valid_lft))
3608 return -EINVAL;
3609
3610 timeout = addrconf_timeout_fixup(valid_lft, HZ);
3611 if (addrconf_finite_timeout(timeout)) {
3612 expires = jiffies_to_clock_t(timeout * HZ);
3613 valid_lft = timeout;
3614 flags = RTF_EXPIRES;
3615 } else {
3616 expires = 0;
3617 flags = 0;
3618 ifa_flags |= IFA_F_PERMANENT;
3619 }
3620
3621 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
3622 if (addrconf_finite_timeout(timeout)) {
3623 if (timeout == 0)
3624 ifa_flags |= IFA_F_DEPRECATED;
3625 prefered_lft = timeout;
3626 }
3627
3628 spin_lock_bh(&ifp->lock);
3629 ifp->flags = (ifp->flags & ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD | IFA_F_HOMEADDRESS)) | ifa_flags;
3630 ifp->tstamp = jiffies;
3631 ifp->valid_lft = valid_lft;
3632 ifp->prefered_lft = prefered_lft;
3633
3634 spin_unlock_bh(&ifp->lock);
3635 if (!(ifp->flags&IFA_F_TENTATIVE))
3636 ipv6_ifa_notify(0, ifp);
3637
3638 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
3639 expires, flags);
3640 addrconf_verify(0);
3641
3642 return 0;
3643 }
3644
3645 static int
3646 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
3647 {
3648 struct net *net = sock_net(skb->sk);
3649 struct ifaddrmsg *ifm;
3650 struct nlattr *tb[IFA_MAX+1];
3651 struct in6_addr *pfx;
3652 struct inet6_ifaddr *ifa;
3653 struct net_device *dev;
3654 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
3655 u8 ifa_flags;
3656 int err;
3657
3658 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3659 if (err < 0)
3660 return err;
3661
3662 ifm = nlmsg_data(nlh);
3663 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
3664 if (pfx == NULL)
3665 return -EINVAL;
3666
3667 if (tb[IFA_CACHEINFO]) {
3668 struct ifa_cacheinfo *ci;
3669
3670 ci = nla_data(tb[IFA_CACHEINFO]);
3671 valid_lft = ci->ifa_valid;
3672 preferred_lft = ci->ifa_prefered;
3673 } else {
3674 preferred_lft = INFINITY_LIFE_TIME;
3675 valid_lft = INFINITY_LIFE_TIME;
3676 }
3677
3678 dev = __dev_get_by_index(net, ifm->ifa_index);
3679 if (dev == NULL)
3680 return -ENODEV;
3681
3682 /* We ignore other flags so far. */
3683 ifa_flags = ifm->ifa_flags & (IFA_F_NODAD | IFA_F_HOMEADDRESS);
3684
3685 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
3686 if (ifa == NULL) {
3687 /*
3688 * It would be best to check for !NLM_F_CREATE here but
3689 * userspace alreay relies on not having to provide this.
3690 */
3691 return inet6_addr_add(net, ifm->ifa_index, pfx,
3692 ifm->ifa_prefixlen, ifa_flags,
3693 preferred_lft, valid_lft);
3694 }
3695
3696 if (nlh->nlmsg_flags & NLM_F_EXCL ||
3697 !(nlh->nlmsg_flags & NLM_F_REPLACE))
3698 err = -EEXIST;
3699 else
3700 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
3701
3702 in6_ifa_put(ifa);
3703
3704 return err;
3705 }
3706
3707 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u8 flags,
3708 u8 scope, int ifindex)
3709 {
3710 struct ifaddrmsg *ifm;
3711
3712 ifm = nlmsg_data(nlh);
3713 ifm->ifa_family = AF_INET6;
3714 ifm->ifa_prefixlen = prefixlen;
3715 ifm->ifa_flags = flags;
3716 ifm->ifa_scope = scope;
3717 ifm->ifa_index = ifindex;
3718 }
3719
3720 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
3721 unsigned long tstamp, u32 preferred, u32 valid)
3722 {
3723 struct ifa_cacheinfo ci;
3724
3725 ci.cstamp = cstamp_delta(cstamp);
3726 ci.tstamp = cstamp_delta(tstamp);
3727 ci.ifa_prefered = preferred;
3728 ci.ifa_valid = valid;
3729
3730 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
3731 }
3732
3733 static inline int rt_scope(int ifa_scope)
3734 {
3735 if (ifa_scope & IFA_HOST)
3736 return RT_SCOPE_HOST;
3737 else if (ifa_scope & IFA_LINK)
3738 return RT_SCOPE_LINK;
3739 else if (ifa_scope & IFA_SITE)
3740 return RT_SCOPE_SITE;
3741 else
3742 return RT_SCOPE_UNIVERSE;
3743 }
3744
3745 static inline int inet6_ifaddr_msgsize(void)
3746 {
3747 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
3748 + nla_total_size(16) /* IFA_ADDRESS */
3749 + nla_total_size(sizeof(struct ifa_cacheinfo));
3750 }
3751
3752 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
3753 u32 portid, u32 seq, int event, unsigned int flags)
3754 {
3755 struct nlmsghdr *nlh;
3756 u32 preferred, valid;
3757
3758 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3759 if (nlh == NULL)
3760 return -EMSGSIZE;
3761
3762 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
3763 ifa->idev->dev->ifindex);
3764
3765 if (!(ifa->flags&IFA_F_PERMANENT)) {
3766 preferred = ifa->prefered_lft;
3767 valid = ifa->valid_lft;
3768 if (preferred != INFINITY_LIFE_TIME) {
3769 long tval = (jiffies - ifa->tstamp)/HZ;
3770 if (preferred > tval)
3771 preferred -= tval;
3772 else
3773 preferred = 0;
3774 if (valid != INFINITY_LIFE_TIME) {
3775 if (valid > tval)
3776 valid -= tval;
3777 else
3778 valid = 0;
3779 }
3780 }
3781 } else {
3782 preferred = INFINITY_LIFE_TIME;
3783 valid = INFINITY_LIFE_TIME;
3784 }
3785
3786 if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
3787 put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
3788 nlmsg_cancel(skb, nlh);
3789 return -EMSGSIZE;
3790 }
3791
3792 return nlmsg_end(skb, nlh);
3793 }
3794
3795 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
3796 u32 portid, u32 seq, int event, u16 flags)
3797 {
3798 struct nlmsghdr *nlh;
3799 u8 scope = RT_SCOPE_UNIVERSE;
3800 int ifindex = ifmca->idev->dev->ifindex;
3801
3802 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
3803 scope = RT_SCOPE_SITE;
3804
3805 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3806 if (nlh == NULL)
3807 return -EMSGSIZE;
3808
3809 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3810 if (nla_put(skb, IFA_MULTICAST, 16, &ifmca->mca_addr) < 0 ||
3811 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
3812 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3813 nlmsg_cancel(skb, nlh);
3814 return -EMSGSIZE;
3815 }
3816
3817 return nlmsg_end(skb, nlh);
3818 }
3819
3820 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
3821 u32 portid, u32 seq, int event, unsigned int flags)
3822 {
3823 struct nlmsghdr *nlh;
3824 u8 scope = RT_SCOPE_UNIVERSE;
3825 int ifindex = ifaca->aca_idev->dev->ifindex;
3826
3827 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
3828 scope = RT_SCOPE_SITE;
3829
3830 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
3831 if (nlh == NULL)
3832 return -EMSGSIZE;
3833
3834 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
3835 if (nla_put(skb, IFA_ANYCAST, 16, &ifaca->aca_addr) < 0 ||
3836 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
3837 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
3838 nlmsg_cancel(skb, nlh);
3839 return -EMSGSIZE;
3840 }
3841
3842 return nlmsg_end(skb, nlh);
3843 }
3844
3845 enum addr_type_t {
3846 UNICAST_ADDR,
3847 MULTICAST_ADDR,
3848 ANYCAST_ADDR,
3849 };
3850
3851 /* called with rcu_read_lock() */
3852 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
3853 struct netlink_callback *cb, enum addr_type_t type,
3854 int s_ip_idx, int *p_ip_idx)
3855 {
3856 struct ifmcaddr6 *ifmca;
3857 struct ifacaddr6 *ifaca;
3858 int err = 1;
3859 int ip_idx = *p_ip_idx;
3860
3861 read_lock_bh(&idev->lock);
3862 switch (type) {
3863 case UNICAST_ADDR: {
3864 struct inet6_ifaddr *ifa;
3865
3866 /* unicast address incl. temp addr */
3867 list_for_each_entry(ifa, &idev->addr_list, if_list) {
3868 if (++ip_idx < s_ip_idx)
3869 continue;
3870 err = inet6_fill_ifaddr(skb, ifa,
3871 NETLINK_CB(cb->skb).portid,
3872 cb->nlh->nlmsg_seq,
3873 RTM_NEWADDR,
3874 NLM_F_MULTI);
3875 if (err <= 0)
3876 break;
3877 }
3878 break;
3879 }
3880 case MULTICAST_ADDR:
3881 /* multicast address */
3882 for (ifmca = idev->mc_list; ifmca;
3883 ifmca = ifmca->next, ip_idx++) {
3884 if (ip_idx < s_ip_idx)
3885 continue;
3886 err = inet6_fill_ifmcaddr(skb, ifmca,
3887 NETLINK_CB(cb->skb).portid,
3888 cb->nlh->nlmsg_seq,
3889 RTM_GETMULTICAST,
3890 NLM_F_MULTI);
3891 if (err <= 0)
3892 break;
3893 }
3894 break;
3895 case ANYCAST_ADDR:
3896 /* anycast address */
3897 for (ifaca = idev->ac_list; ifaca;
3898 ifaca = ifaca->aca_next, ip_idx++) {
3899 if (ip_idx < s_ip_idx)
3900 continue;
3901 err = inet6_fill_ifacaddr(skb, ifaca,
3902 NETLINK_CB(cb->skb).portid,
3903 cb->nlh->nlmsg_seq,
3904 RTM_GETANYCAST,
3905 NLM_F_MULTI);
3906 if (err <= 0)
3907 break;
3908 }
3909 break;
3910 default:
3911 break;
3912 }
3913 read_unlock_bh(&idev->lock);
3914 *p_ip_idx = ip_idx;
3915 return err;
3916 }
3917
3918 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
3919 enum addr_type_t type)
3920 {
3921 struct net *net = sock_net(skb->sk);
3922 int h, s_h;
3923 int idx, ip_idx;
3924 int s_idx, s_ip_idx;
3925 struct net_device *dev;
3926 struct inet6_dev *idev;
3927 struct hlist_head *head;
3928
3929 s_h = cb->args[0];
3930 s_idx = idx = cb->args[1];
3931 s_ip_idx = ip_idx = cb->args[2];
3932
3933 rcu_read_lock();
3934 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
3935 idx = 0;
3936 head = &net->dev_index_head[h];
3937 hlist_for_each_entry_rcu(dev, head, index_hlist) {
3938 if (idx < s_idx)
3939 goto cont;
3940 if (h > s_h || idx > s_idx)
3941 s_ip_idx = 0;
3942 ip_idx = 0;
3943 idev = __in6_dev_get(dev);
3944 if (!idev)
3945 goto cont;
3946
3947 if (in6_dump_addrs(idev, skb, cb, type,
3948 s_ip_idx, &ip_idx) <= 0)
3949 goto done;
3950 cont:
3951 idx++;
3952 }
3953 }
3954 done:
3955 rcu_read_unlock();
3956 cb->args[0] = h;
3957 cb->args[1] = idx;
3958 cb->args[2] = ip_idx;
3959
3960 return skb->len;
3961 }
3962
3963 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
3964 {
3965 enum addr_type_t type = UNICAST_ADDR;
3966
3967 return inet6_dump_addr(skb, cb, type);
3968 }
3969
3970 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
3971 {
3972 enum addr_type_t type = MULTICAST_ADDR;
3973
3974 return inet6_dump_addr(skb, cb, type);
3975 }
3976
3977
3978 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
3979 {
3980 enum addr_type_t type = ANYCAST_ADDR;
3981
3982 return inet6_dump_addr(skb, cb, type);
3983 }
3984
3985 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
3986 {
3987 struct net *net = sock_net(in_skb->sk);
3988 struct ifaddrmsg *ifm;
3989 struct nlattr *tb[IFA_MAX+1];
3990 struct in6_addr *addr = NULL;
3991 struct net_device *dev = NULL;
3992 struct inet6_ifaddr *ifa;
3993 struct sk_buff *skb;
3994 int err;
3995
3996 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
3997 if (err < 0)
3998 goto errout;
3999
4000 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
4001 if (addr == NULL) {
4002 err = -EINVAL;
4003 goto errout;
4004 }
4005
4006 ifm = nlmsg_data(nlh);
4007 if (ifm->ifa_index)
4008 dev = __dev_get_by_index(net, ifm->ifa_index);
4009
4010 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4011 if (!ifa) {
4012 err = -EADDRNOTAVAIL;
4013 goto errout;
4014 }
4015
4016 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4017 if (!skb) {
4018 err = -ENOBUFS;
4019 goto errout_ifa;
4020 }
4021
4022 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4023 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4024 if (err < 0) {
4025 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4026 WARN_ON(err == -EMSGSIZE);
4027 kfree_skb(skb);
4028 goto errout_ifa;
4029 }
4030 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4031 errout_ifa:
4032 in6_ifa_put(ifa);
4033 errout:
4034 return err;
4035 }
4036
4037 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4038 {
4039 struct sk_buff *skb;
4040 struct net *net = dev_net(ifa->idev->dev);
4041 int err = -ENOBUFS;
4042
4043 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4044 if (skb == NULL)
4045 goto errout;
4046
4047 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4048 if (err < 0) {
4049 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4050 WARN_ON(err == -EMSGSIZE);
4051 kfree_skb(skb);
4052 goto errout;
4053 }
4054 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4055 return;
4056 errout:
4057 if (err < 0)
4058 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4059 }
4060
4061 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4062 __s32 *array, int bytes)
4063 {
4064 BUG_ON(bytes < (DEVCONF_MAX * 4));
4065
4066 memset(array, 0, bytes);
4067 array[DEVCONF_FORWARDING] = cnf->forwarding;
4068 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4069 array[DEVCONF_MTU6] = cnf->mtu6;
4070 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4071 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4072 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4073 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4074 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4075 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4076 jiffies_to_msecs(cnf->rtr_solicit_interval);
4077 array[DEVCONF_RTR_SOLICIT_DELAY] =
4078 jiffies_to_msecs(cnf->rtr_solicit_delay);
4079 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4080 #ifdef CONFIG_IPV6_PRIVACY
4081 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4082 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4083 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4084 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4085 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4086 #endif
4087 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4088 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4089 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4090 #ifdef CONFIG_IPV6_ROUTER_PREF
4091 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4092 array[DEVCONF_RTR_PROBE_INTERVAL] =
4093 jiffies_to_msecs(cnf->rtr_probe_interval);
4094 #ifdef CONFIG_IPV6_ROUTE_INFO
4095 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4096 #endif
4097 #endif
4098 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4099 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4100 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4101 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4102 #endif
4103 #ifdef CONFIG_IPV6_MROUTE
4104 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4105 #endif
4106 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4107 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4108 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4109 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4110 }
4111
4112 static inline size_t inet6_ifla6_size(void)
4113 {
4114 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4115 + nla_total_size(sizeof(struct ifla_cacheinfo))
4116 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4117 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4118 + nla_total_size(ICMP6_MIB_MAX * 8); /* IFLA_INET6_ICMP6STATS */
4119 }
4120
4121 static inline size_t inet6_if_nlmsg_size(void)
4122 {
4123 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4124 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4125 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4126 + nla_total_size(4) /* IFLA_MTU */
4127 + nla_total_size(4) /* IFLA_LINK */
4128 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4129 }
4130
4131 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4132 int items, int bytes)
4133 {
4134 int i;
4135 int pad = bytes - sizeof(u64) * items;
4136 BUG_ON(pad < 0);
4137
4138 /* Use put_unaligned() because stats may not be aligned for u64. */
4139 put_unaligned(items, &stats[0]);
4140 for (i = 1; i < items; i++)
4141 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4142
4143 memset(&stats[items], 0, pad);
4144 }
4145
4146 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu **mib,
4147 int items, int bytes, size_t syncpoff)
4148 {
4149 int i;
4150 int pad = bytes - sizeof(u64) * items;
4151 BUG_ON(pad < 0);
4152
4153 /* Use put_unaligned() because stats may not be aligned for u64. */
4154 put_unaligned(items, &stats[0]);
4155 for (i = 1; i < items; i++)
4156 put_unaligned(snmp_fold_field64(mib, i, syncpoff), &stats[i]);
4157
4158 memset(&stats[items], 0, pad);
4159 }
4160
4161 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4162 int bytes)
4163 {
4164 switch (attrtype) {
4165 case IFLA_INET6_STATS:
4166 __snmp6_fill_stats64(stats, (void __percpu **)idev->stats.ipv6,
4167 IPSTATS_MIB_MAX, bytes, offsetof(struct ipstats_mib, syncp));
4168 break;
4169 case IFLA_INET6_ICMP6STATS:
4170 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4171 break;
4172 }
4173 }
4174
4175 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev)
4176 {
4177 struct nlattr *nla;
4178 struct ifla_cacheinfo ci;
4179
4180 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4181 goto nla_put_failure;
4182 ci.max_reasm_len = IPV6_MAXPLEN;
4183 ci.tstamp = cstamp_delta(idev->tstamp);
4184 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4185 ci.retrans_time = jiffies_to_msecs(idev->nd_parms->retrans_time);
4186 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4187 goto nla_put_failure;
4188 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4189 if (nla == NULL)
4190 goto nla_put_failure;
4191 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4192
4193 /* XXX - MC not implemented */
4194
4195 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4196 if (nla == NULL)
4197 goto nla_put_failure;
4198 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4199
4200 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4201 if (nla == NULL)
4202 goto nla_put_failure;
4203 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4204
4205 return 0;
4206
4207 nla_put_failure:
4208 return -EMSGSIZE;
4209 }
4210
4211 static size_t inet6_get_link_af_size(const struct net_device *dev)
4212 {
4213 if (!__in6_dev_get(dev))
4214 return 0;
4215
4216 return inet6_ifla6_size();
4217 }
4218
4219 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev)
4220 {
4221 struct inet6_dev *idev = __in6_dev_get(dev);
4222
4223 if (!idev)
4224 return -ENODATA;
4225
4226 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4227 return -EMSGSIZE;
4228
4229 return 0;
4230 }
4231
4232 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4233 u32 portid, u32 seq, int event, unsigned int flags)
4234 {
4235 struct net_device *dev = idev->dev;
4236 struct ifinfomsg *hdr;
4237 struct nlmsghdr *nlh;
4238 void *protoinfo;
4239
4240 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4241 if (nlh == NULL)
4242 return -EMSGSIZE;
4243
4244 hdr = nlmsg_data(nlh);
4245 hdr->ifi_family = AF_INET6;
4246 hdr->__ifi_pad = 0;
4247 hdr->ifi_type = dev->type;
4248 hdr->ifi_index = dev->ifindex;
4249 hdr->ifi_flags = dev_get_flags(dev);
4250 hdr->ifi_change = 0;
4251
4252 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4253 (dev->addr_len &&
4254 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4255 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4256 (dev->ifindex != dev->iflink &&
4257 nla_put_u32(skb, IFLA_LINK, dev->iflink)))
4258 goto nla_put_failure;
4259 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4260 if (protoinfo == NULL)
4261 goto nla_put_failure;
4262
4263 if (inet6_fill_ifla6_attrs(skb, idev) < 0)
4264 goto nla_put_failure;
4265
4266 nla_nest_end(skb, protoinfo);
4267 return nlmsg_end(skb, nlh);
4268
4269 nla_put_failure:
4270 nlmsg_cancel(skb, nlh);
4271 return -EMSGSIZE;
4272 }
4273
4274 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4275 {
4276 struct net *net = sock_net(skb->sk);
4277 int h, s_h;
4278 int idx = 0, s_idx;
4279 struct net_device *dev;
4280 struct inet6_dev *idev;
4281 struct hlist_head *head;
4282
4283 s_h = cb->args[0];
4284 s_idx = cb->args[1];
4285
4286 rcu_read_lock();
4287 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4288 idx = 0;
4289 head = &net->dev_index_head[h];
4290 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4291 if (idx < s_idx)
4292 goto cont;
4293 idev = __in6_dev_get(dev);
4294 if (!idev)
4295 goto cont;
4296 if (inet6_fill_ifinfo(skb, idev,
4297 NETLINK_CB(cb->skb).portid,
4298 cb->nlh->nlmsg_seq,
4299 RTM_NEWLINK, NLM_F_MULTI) <= 0)
4300 goto out;
4301 cont:
4302 idx++;
4303 }
4304 }
4305 out:
4306 rcu_read_unlock();
4307 cb->args[1] = idx;
4308 cb->args[0] = h;
4309
4310 return skb->len;
4311 }
4312
4313 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
4314 {
4315 struct sk_buff *skb;
4316 struct net *net = dev_net(idev->dev);
4317 int err = -ENOBUFS;
4318
4319 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
4320 if (skb == NULL)
4321 goto errout;
4322
4323 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
4324 if (err < 0) {
4325 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
4326 WARN_ON(err == -EMSGSIZE);
4327 kfree_skb(skb);
4328 goto errout;
4329 }
4330 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
4331 return;
4332 errout:
4333 if (err < 0)
4334 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
4335 }
4336
4337 static inline size_t inet6_prefix_nlmsg_size(void)
4338 {
4339 return NLMSG_ALIGN(sizeof(struct prefixmsg))
4340 + nla_total_size(sizeof(struct in6_addr))
4341 + nla_total_size(sizeof(struct prefix_cacheinfo));
4342 }
4343
4344 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
4345 struct prefix_info *pinfo, u32 portid, u32 seq,
4346 int event, unsigned int flags)
4347 {
4348 struct prefixmsg *pmsg;
4349 struct nlmsghdr *nlh;
4350 struct prefix_cacheinfo ci;
4351
4352 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
4353 if (nlh == NULL)
4354 return -EMSGSIZE;
4355
4356 pmsg = nlmsg_data(nlh);
4357 pmsg->prefix_family = AF_INET6;
4358 pmsg->prefix_pad1 = 0;
4359 pmsg->prefix_pad2 = 0;
4360 pmsg->prefix_ifindex = idev->dev->ifindex;
4361 pmsg->prefix_len = pinfo->prefix_len;
4362 pmsg->prefix_type = pinfo->type;
4363 pmsg->prefix_pad3 = 0;
4364 pmsg->prefix_flags = 0;
4365 if (pinfo->onlink)
4366 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
4367 if (pinfo->autoconf)
4368 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
4369
4370 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
4371 goto nla_put_failure;
4372 ci.preferred_time = ntohl(pinfo->prefered);
4373 ci.valid_time = ntohl(pinfo->valid);
4374 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
4375 goto nla_put_failure;
4376 return nlmsg_end(skb, nlh);
4377
4378 nla_put_failure:
4379 nlmsg_cancel(skb, nlh);
4380 return -EMSGSIZE;
4381 }
4382
4383 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
4384 struct prefix_info *pinfo)
4385 {
4386 struct sk_buff *skb;
4387 struct net *net = dev_net(idev->dev);
4388 int err = -ENOBUFS;
4389
4390 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
4391 if (skb == NULL)
4392 goto errout;
4393
4394 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
4395 if (err < 0) {
4396 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
4397 WARN_ON(err == -EMSGSIZE);
4398 kfree_skb(skb);
4399 goto errout;
4400 }
4401 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
4402 return;
4403 errout:
4404 if (err < 0)
4405 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
4406 }
4407
4408 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4409 {
4410 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
4411
4412 switch (event) {
4413 case RTM_NEWADDR:
4414 /*
4415 * If the address was optimistic
4416 * we inserted the route at the start of
4417 * our DAD process, so we don't need
4418 * to do it again
4419 */
4420 if (!(ifp->rt->rt6i_node))
4421 ip6_ins_rt(ifp->rt);
4422 if (ifp->idev->cnf.forwarding)
4423 addrconf_join_anycast(ifp);
4424 break;
4425 case RTM_DELADDR:
4426 if (ifp->idev->cnf.forwarding)
4427 addrconf_leave_anycast(ifp);
4428 addrconf_leave_solict(ifp->idev, &ifp->addr);
4429 dst_hold(&ifp->rt->dst);
4430
4431 if (ip6_del_rt(ifp->rt))
4432 dst_free(&ifp->rt->dst);
4433 break;
4434 }
4435 }
4436
4437 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
4438 {
4439 rcu_read_lock_bh();
4440 if (likely(ifp->idev->dead == 0))
4441 __ipv6_ifa_notify(event, ifp);
4442 rcu_read_unlock_bh();
4443 }
4444
4445 #ifdef CONFIG_SYSCTL
4446
4447 static
4448 int addrconf_sysctl_forward(ctl_table *ctl, int write,
4449 void __user *buffer, size_t *lenp, loff_t *ppos)
4450 {
4451 int *valp = ctl->data;
4452 int val = *valp;
4453 loff_t pos = *ppos;
4454 ctl_table lctl;
4455 int ret;
4456
4457 /*
4458 * ctl->data points to idev->cnf.forwarding, we should
4459 * not modify it until we get the rtnl lock.
4460 */
4461 lctl = *ctl;
4462 lctl.data = &val;
4463
4464 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4465
4466 if (write)
4467 ret = addrconf_fixup_forwarding(ctl, valp, val);
4468 if (ret)
4469 *ppos = pos;
4470 return ret;
4471 }
4472
4473 static void dev_disable_change(struct inet6_dev *idev)
4474 {
4475 if (!idev || !idev->dev)
4476 return;
4477
4478 if (idev->cnf.disable_ipv6)
4479 addrconf_notify(NULL, NETDEV_DOWN, idev->dev);
4480 else
4481 addrconf_notify(NULL, NETDEV_UP, idev->dev);
4482 }
4483
4484 static void addrconf_disable_change(struct net *net, __s32 newf)
4485 {
4486 struct net_device *dev;
4487 struct inet6_dev *idev;
4488
4489 rcu_read_lock();
4490 for_each_netdev_rcu(net, dev) {
4491 idev = __in6_dev_get(dev);
4492 if (idev) {
4493 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
4494 idev->cnf.disable_ipv6 = newf;
4495 if (changed)
4496 dev_disable_change(idev);
4497 }
4498 }
4499 rcu_read_unlock();
4500 }
4501
4502 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
4503 {
4504 struct net *net;
4505 int old;
4506
4507 if (!rtnl_trylock())
4508 return restart_syscall();
4509
4510 net = (struct net *)table->extra2;
4511 old = *p;
4512 *p = newf;
4513
4514 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
4515 rtnl_unlock();
4516 return 0;
4517 }
4518
4519 if (p == &net->ipv6.devconf_all->disable_ipv6) {
4520 net->ipv6.devconf_dflt->disable_ipv6 = newf;
4521 addrconf_disable_change(net, newf);
4522 } else if ((!newf) ^ (!old))
4523 dev_disable_change((struct inet6_dev *)table->extra1);
4524
4525 rtnl_unlock();
4526 return 0;
4527 }
4528
4529 static
4530 int addrconf_sysctl_disable(ctl_table *ctl, int write,
4531 void __user *buffer, size_t *lenp, loff_t *ppos)
4532 {
4533 int *valp = ctl->data;
4534 int val = *valp;
4535 loff_t pos = *ppos;
4536 ctl_table lctl;
4537 int ret;
4538
4539 /*
4540 * ctl->data points to idev->cnf.disable_ipv6, we should
4541 * not modify it until we get the rtnl lock.
4542 */
4543 lctl = *ctl;
4544 lctl.data = &val;
4545
4546 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
4547
4548 if (write)
4549 ret = addrconf_disable_ipv6(ctl, valp, val);
4550 if (ret)
4551 *ppos = pos;
4552 return ret;
4553 }
4554
4555 static struct addrconf_sysctl_table
4556 {
4557 struct ctl_table_header *sysctl_header;
4558 ctl_table addrconf_vars[DEVCONF_MAX+1];
4559 } addrconf_sysctl __read_mostly = {
4560 .sysctl_header = NULL,
4561 .addrconf_vars = {
4562 {
4563 .procname = "forwarding",
4564 .data = &ipv6_devconf.forwarding,
4565 .maxlen = sizeof(int),
4566 .mode = 0644,
4567 .proc_handler = addrconf_sysctl_forward,
4568 },
4569 {
4570 .procname = "hop_limit",
4571 .data = &ipv6_devconf.hop_limit,
4572 .maxlen = sizeof(int),
4573 .mode = 0644,
4574 .proc_handler = proc_dointvec,
4575 },
4576 {
4577 .procname = "mtu",
4578 .data = &ipv6_devconf.mtu6,
4579 .maxlen = sizeof(int),
4580 .mode = 0644,
4581 .proc_handler = proc_dointvec,
4582 },
4583 {
4584 .procname = "accept_ra",
4585 .data = &ipv6_devconf.accept_ra,
4586 .maxlen = sizeof(int),
4587 .mode = 0644,
4588 .proc_handler = proc_dointvec,
4589 },
4590 {
4591 .procname = "accept_redirects",
4592 .data = &ipv6_devconf.accept_redirects,
4593 .maxlen = sizeof(int),
4594 .mode = 0644,
4595 .proc_handler = proc_dointvec,
4596 },
4597 {
4598 .procname = "autoconf",
4599 .data = &ipv6_devconf.autoconf,
4600 .maxlen = sizeof(int),
4601 .mode = 0644,
4602 .proc_handler = proc_dointvec,
4603 },
4604 {
4605 .procname = "dad_transmits",
4606 .data = &ipv6_devconf.dad_transmits,
4607 .maxlen = sizeof(int),
4608 .mode = 0644,
4609 .proc_handler = proc_dointvec,
4610 },
4611 {
4612 .procname = "router_solicitations",
4613 .data = &ipv6_devconf.rtr_solicits,
4614 .maxlen = sizeof(int),
4615 .mode = 0644,
4616 .proc_handler = proc_dointvec,
4617 },
4618 {
4619 .procname = "router_solicitation_interval",
4620 .data = &ipv6_devconf.rtr_solicit_interval,
4621 .maxlen = sizeof(int),
4622 .mode = 0644,
4623 .proc_handler = proc_dointvec_jiffies,
4624 },
4625 {
4626 .procname = "router_solicitation_delay",
4627 .data = &ipv6_devconf.rtr_solicit_delay,
4628 .maxlen = sizeof(int),
4629 .mode = 0644,
4630 .proc_handler = proc_dointvec_jiffies,
4631 },
4632 {
4633 .procname = "force_mld_version",
4634 .data = &ipv6_devconf.force_mld_version,
4635 .maxlen = sizeof(int),
4636 .mode = 0644,
4637 .proc_handler = proc_dointvec,
4638 },
4639 #ifdef CONFIG_IPV6_PRIVACY
4640 {
4641 .procname = "use_tempaddr",
4642 .data = &ipv6_devconf.use_tempaddr,
4643 .maxlen = sizeof(int),
4644 .mode = 0644,
4645 .proc_handler = proc_dointvec,
4646 },
4647 {
4648 .procname = "temp_valid_lft",
4649 .data = &ipv6_devconf.temp_valid_lft,
4650 .maxlen = sizeof(int),
4651 .mode = 0644,
4652 .proc_handler = proc_dointvec,
4653 },
4654 {
4655 .procname = "temp_prefered_lft",
4656 .data = &ipv6_devconf.temp_prefered_lft,
4657 .maxlen = sizeof(int),
4658 .mode = 0644,
4659 .proc_handler = proc_dointvec,
4660 },
4661 {
4662 .procname = "regen_max_retry",
4663 .data = &ipv6_devconf.regen_max_retry,
4664 .maxlen = sizeof(int),
4665 .mode = 0644,
4666 .proc_handler = proc_dointvec,
4667 },
4668 {
4669 .procname = "max_desync_factor",
4670 .data = &ipv6_devconf.max_desync_factor,
4671 .maxlen = sizeof(int),
4672 .mode = 0644,
4673 .proc_handler = proc_dointvec,
4674 },
4675 #endif
4676 {
4677 .procname = "max_addresses",
4678 .data = &ipv6_devconf.max_addresses,
4679 .maxlen = sizeof(int),
4680 .mode = 0644,
4681 .proc_handler = proc_dointvec,
4682 },
4683 {
4684 .procname = "accept_ra_defrtr",
4685 .data = &ipv6_devconf.accept_ra_defrtr,
4686 .maxlen = sizeof(int),
4687 .mode = 0644,
4688 .proc_handler = proc_dointvec,
4689 },
4690 {
4691 .procname = "accept_ra_pinfo",
4692 .data = &ipv6_devconf.accept_ra_pinfo,
4693 .maxlen = sizeof(int),
4694 .mode = 0644,
4695 .proc_handler = proc_dointvec,
4696 },
4697 #ifdef CONFIG_IPV6_ROUTER_PREF
4698 {
4699 .procname = "accept_ra_rtr_pref",
4700 .data = &ipv6_devconf.accept_ra_rtr_pref,
4701 .maxlen = sizeof(int),
4702 .mode = 0644,
4703 .proc_handler = proc_dointvec,
4704 },
4705 {
4706 .procname = "router_probe_interval",
4707 .data = &ipv6_devconf.rtr_probe_interval,
4708 .maxlen = sizeof(int),
4709 .mode = 0644,
4710 .proc_handler = proc_dointvec_jiffies,
4711 },
4712 #ifdef CONFIG_IPV6_ROUTE_INFO
4713 {
4714 .procname = "accept_ra_rt_info_max_plen",
4715 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
4716 .maxlen = sizeof(int),
4717 .mode = 0644,
4718 .proc_handler = proc_dointvec,
4719 },
4720 #endif
4721 #endif
4722 {
4723 .procname = "proxy_ndp",
4724 .data = &ipv6_devconf.proxy_ndp,
4725 .maxlen = sizeof(int),
4726 .mode = 0644,
4727 .proc_handler = proc_dointvec,
4728 },
4729 {
4730 .procname = "accept_source_route",
4731 .data = &ipv6_devconf.accept_source_route,
4732 .maxlen = sizeof(int),
4733 .mode = 0644,
4734 .proc_handler = proc_dointvec,
4735 },
4736 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4737 {
4738 .procname = "optimistic_dad",
4739 .data = &ipv6_devconf.optimistic_dad,
4740 .maxlen = sizeof(int),
4741 .mode = 0644,
4742 .proc_handler = proc_dointvec,
4743
4744 },
4745 #endif
4746 #ifdef CONFIG_IPV6_MROUTE
4747 {
4748 .procname = "mc_forwarding",
4749 .data = &ipv6_devconf.mc_forwarding,
4750 .maxlen = sizeof(int),
4751 .mode = 0444,
4752 .proc_handler = proc_dointvec,
4753 },
4754 #endif
4755 {
4756 .procname = "disable_ipv6",
4757 .data = &ipv6_devconf.disable_ipv6,
4758 .maxlen = sizeof(int),
4759 .mode = 0644,
4760 .proc_handler = addrconf_sysctl_disable,
4761 },
4762 {
4763 .procname = "accept_dad",
4764 .data = &ipv6_devconf.accept_dad,
4765 .maxlen = sizeof(int),
4766 .mode = 0644,
4767 .proc_handler = proc_dointvec,
4768 },
4769 {
4770 .procname = "force_tllao",
4771 .data = &ipv6_devconf.force_tllao,
4772 .maxlen = sizeof(int),
4773 .mode = 0644,
4774 .proc_handler = proc_dointvec
4775 },
4776 {
4777 .procname = "ndisc_notify",
4778 .data = &ipv6_devconf.ndisc_notify,
4779 .maxlen = sizeof(int),
4780 .mode = 0644,
4781 .proc_handler = proc_dointvec
4782 },
4783 {
4784 /* sentinel */
4785 }
4786 },
4787 };
4788
4789 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
4790 struct inet6_dev *idev, struct ipv6_devconf *p)
4791 {
4792 int i;
4793 struct addrconf_sysctl_table *t;
4794 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
4795
4796 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
4797 if (t == NULL)
4798 goto out;
4799
4800 for (i = 0; t->addrconf_vars[i].data; i++) {
4801 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
4802 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
4803 t->addrconf_vars[i].extra2 = net;
4804 }
4805
4806 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
4807
4808 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
4809 if (t->sysctl_header == NULL)
4810 goto free;
4811
4812 p->sysctl = t;
4813 return 0;
4814
4815 free:
4816 kfree(t);
4817 out:
4818 return -ENOBUFS;
4819 }
4820
4821 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
4822 {
4823 struct addrconf_sysctl_table *t;
4824
4825 if (p->sysctl == NULL)
4826 return;
4827
4828 t = p->sysctl;
4829 p->sysctl = NULL;
4830 unregister_net_sysctl_table(t->sysctl_header);
4831 kfree(t);
4832 }
4833
4834 static void addrconf_sysctl_register(struct inet6_dev *idev)
4835 {
4836 neigh_sysctl_register(idev->dev, idev->nd_parms, "ipv6",
4837 &ndisc_ifinfo_sysctl_change);
4838 __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
4839 idev, &idev->cnf);
4840 }
4841
4842 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
4843 {
4844 __addrconf_sysctl_unregister(&idev->cnf);
4845 neigh_sysctl_unregister(idev->nd_parms);
4846 }
4847
4848
4849 #endif
4850
4851 static int __net_init addrconf_init_net(struct net *net)
4852 {
4853 int err;
4854 struct ipv6_devconf *all, *dflt;
4855
4856 err = -ENOMEM;
4857 all = &ipv6_devconf;
4858 dflt = &ipv6_devconf_dflt;
4859
4860 if (!net_eq(net, &init_net)) {
4861 all = kmemdup(all, sizeof(ipv6_devconf), GFP_KERNEL);
4862 if (all == NULL)
4863 goto err_alloc_all;
4864
4865 dflt = kmemdup(dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
4866 if (dflt == NULL)
4867 goto err_alloc_dflt;
4868 } else {
4869 /* these will be inherited by all namespaces */
4870 dflt->autoconf = ipv6_defaults.autoconf;
4871 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
4872 }
4873
4874 net->ipv6.devconf_all = all;
4875 net->ipv6.devconf_dflt = dflt;
4876
4877 #ifdef CONFIG_SYSCTL
4878 err = __addrconf_sysctl_register(net, "all", NULL, all);
4879 if (err < 0)
4880 goto err_reg_all;
4881
4882 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
4883 if (err < 0)
4884 goto err_reg_dflt;
4885 #endif
4886 return 0;
4887
4888 #ifdef CONFIG_SYSCTL
4889 err_reg_dflt:
4890 __addrconf_sysctl_unregister(all);
4891 err_reg_all:
4892 kfree(dflt);
4893 #endif
4894 err_alloc_dflt:
4895 kfree(all);
4896 err_alloc_all:
4897 return err;
4898 }
4899
4900 static void __net_exit addrconf_exit_net(struct net *net)
4901 {
4902 #ifdef CONFIG_SYSCTL
4903 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
4904 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
4905 #endif
4906 if (!net_eq(net, &init_net)) {
4907 kfree(net->ipv6.devconf_dflt);
4908 kfree(net->ipv6.devconf_all);
4909 }
4910 }
4911
4912 static struct pernet_operations addrconf_ops = {
4913 .init = addrconf_init_net,
4914 .exit = addrconf_exit_net,
4915 };
4916
4917 /*
4918 * Device notifier
4919 */
4920
4921 int register_inet6addr_notifier(struct notifier_block *nb)
4922 {
4923 return atomic_notifier_chain_register(&inet6addr_chain, nb);
4924 }
4925 EXPORT_SYMBOL(register_inet6addr_notifier);
4926
4927 int unregister_inet6addr_notifier(struct notifier_block *nb)
4928 {
4929 return atomic_notifier_chain_unregister(&inet6addr_chain, nb);
4930 }
4931 EXPORT_SYMBOL(unregister_inet6addr_notifier);
4932
4933 static struct rtnl_af_ops inet6_ops = {
4934 .family = AF_INET6,
4935 .fill_link_af = inet6_fill_link_af,
4936 .get_link_af_size = inet6_get_link_af_size,
4937 };
4938
4939 /*
4940 * Init / cleanup code
4941 */
4942
4943 int __init addrconf_init(void)
4944 {
4945 int i, err;
4946
4947 err = ipv6_addr_label_init();
4948 if (err < 0) {
4949 pr_crit("%s: cannot initialize default policy table: %d\n",
4950 __func__, err);
4951 goto out;
4952 }
4953
4954 err = register_pernet_subsys(&addrconf_ops);
4955 if (err < 0)
4956 goto out_addrlabel;
4957
4958 /* The addrconf netdev notifier requires that loopback_dev
4959 * has it's ipv6 private information allocated and setup
4960 * before it can bring up and give link-local addresses
4961 * to other devices which are up.
4962 *
4963 * Unfortunately, loopback_dev is not necessarily the first
4964 * entry in the global dev_base list of net devices. In fact,
4965 * it is likely to be the very last entry on that list.
4966 * So this causes the notifier registry below to try and
4967 * give link-local addresses to all devices besides loopback_dev
4968 * first, then loopback_dev, which cases all the non-loopback_dev
4969 * devices to fail to get a link-local address.
4970 *
4971 * So, as a temporary fix, allocate the ipv6 structure for
4972 * loopback_dev first by hand.
4973 * Longer term, all of the dependencies ipv6 has upon the loopback
4974 * device and it being up should be removed.
4975 */
4976 rtnl_lock();
4977 if (!ipv6_add_dev(init_net.loopback_dev))
4978 err = -ENOMEM;
4979 rtnl_unlock();
4980 if (err)
4981 goto errlo;
4982
4983 for (i = 0; i < IN6_ADDR_HSIZE; i++)
4984 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
4985
4986 register_netdevice_notifier(&ipv6_dev_notf);
4987
4988 addrconf_verify(0);
4989
4990 err = rtnl_af_register(&inet6_ops);
4991 if (err < 0)
4992 goto errout_af;
4993
4994 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
4995 NULL);
4996 if (err < 0)
4997 goto errout;
4998
4999 /* Only the first call to __rtnl_register can fail */
5000 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5001 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5002 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5003 inet6_dump_ifaddr, NULL);
5004 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5005 inet6_dump_ifmcaddr, NULL);
5006 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5007 inet6_dump_ifacaddr, NULL);
5008 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5009 inet6_netconf_dump_devconf, NULL);
5010
5011 ipv6_addr_label_rtnl_register();
5012
5013 return 0;
5014 errout:
5015 rtnl_af_unregister(&inet6_ops);
5016 errout_af:
5017 unregister_netdevice_notifier(&ipv6_dev_notf);
5018 errlo:
5019 unregister_pernet_subsys(&addrconf_ops);
5020 out_addrlabel:
5021 ipv6_addr_label_cleanup();
5022 out:
5023 return err;
5024 }
5025
5026 void addrconf_cleanup(void)
5027 {
5028 struct net_device *dev;
5029 int i;
5030
5031 unregister_netdevice_notifier(&ipv6_dev_notf);
5032 unregister_pernet_subsys(&addrconf_ops);
5033 ipv6_addr_label_cleanup();
5034
5035 rtnl_lock();
5036
5037 __rtnl_af_unregister(&inet6_ops);
5038
5039 /* clean dev list */
5040 for_each_netdev(&init_net, dev) {
5041 if (__in6_dev_get(dev) == NULL)
5042 continue;
5043 addrconf_ifdown(dev, 1);
5044 }
5045 addrconf_ifdown(init_net.loopback_dev, 2);
5046
5047 /*
5048 * Check hash table.
5049 */
5050 spin_lock_bh(&addrconf_hash_lock);
5051 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5052 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5053 spin_unlock_bh(&addrconf_hash_lock);
5054
5055 del_timer(&addr_chk_timer);
5056 rtnl_unlock();
5057 }
Linux kernel - Deliverables
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