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Merge branch 'mlxsw-flooding-and-cosmetics'
[mirror_ubuntu-bionic-kernel.git] / net / ipv6 / addrconf.c
... / ...
CommitLineData
1/*
2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
15/*
16 * Changes:
17 *
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
21 * unload.
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
24 * packets.
25 * yoshfuji@USAGI : Fixed interval between DAD
26 * packets.
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
30 * support.
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
35 * seq_file.
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
38 * status etc.
39 */
40
41#define pr_fmt(fmt) "IPv6: " fmt
42
43#include <linux/errno.h>
44#include <linux/types.h>
45#include <linux/kernel.h>
46#include <linux/socket.h>
47#include <linux/sockios.h>
48#include <linux/net.h>
49#include <linux/inet.h>
50#include <linux/in6.h>
51#include <linux/netdevice.h>
52#include <linux/if_addr.h>
53#include <linux/if_arp.h>
54#include <linux/if_arcnet.h>
55#include <linux/if_infiniband.h>
56#include <linux/route.h>
57#include <linux/inetdevice.h>
58#include <linux/init.h>
59#include <linux/slab.h>
60#ifdef CONFIG_SYSCTL
61#include <linux/sysctl.h>
62#endif
63#include <linux/capability.h>
64#include <linux/delay.h>
65#include <linux/notifier.h>
66#include <linux/string.h>
67#include <linux/hash.h>
68
69#include <net/net_namespace.h>
70#include <net/sock.h>
71#include <net/snmp.h>
72
73#include <net/af_ieee802154.h>
74#include <net/firewire.h>
75#include <net/ipv6.h>
76#include <net/protocol.h>
77#include <net/ndisc.h>
78#include <net/ip6_route.h>
79#include <net/addrconf.h>
80#include <net/tcp.h>
81#include <net/ip.h>
82#include <net/netlink.h>
83#include <net/pkt_sched.h>
84#include <net/l3mdev.h>
85#include <linux/if_tunnel.h>
86#include <linux/rtnetlink.h>
87#include <linux/netconf.h>
88#include <linux/random.h>
89#include <linux/uaccess.h>
90#include <asm/unaligned.h>
91
92#include <linux/proc_fs.h>
93#include <linux/seq_file.h>
94#include <linux/export.h>
95
96/* Set to 3 to get tracing... */
97#define ACONF_DEBUG 2
98
99#if ACONF_DEBUG >= 3
100#define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
101#else
102#define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
103#endif
104
105#define INFINITY_LIFE_TIME 0xFFFFFFFF
106
107#define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
109
110static inline u32 cstamp_delta(unsigned long cstamp)
111{
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
113}
114
115#ifdef CONFIG_SYSCTL
116static int addrconf_sysctl_register(struct inet6_dev *idev);
117static void addrconf_sysctl_unregister(struct inet6_dev *idev);
118#else
119static inline int addrconf_sysctl_register(struct inet6_dev *idev)
120{
121 return 0;
122}
123
124static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
125{
126}
127#endif
128
129static void __ipv6_regen_rndid(struct inet6_dev *idev);
130static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
131static void ipv6_regen_rndid(unsigned long data);
132
133static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134static int ipv6_count_addresses(struct inet6_dev *idev);
135static int ipv6_generate_stable_address(struct in6_addr *addr,
136 u8 dad_count,
137 const struct inet6_dev *idev);
138
139/*
140 * Configured unicast address hash table
141 */
142static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
143static DEFINE_SPINLOCK(addrconf_hash_lock);
144
145static void addrconf_verify(void);
146static void addrconf_verify_rtnl(void);
147static void addrconf_verify_work(struct work_struct *);
148
149static struct workqueue_struct *addrconf_wq;
150static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
151
152static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
154
155static void addrconf_type_change(struct net_device *dev,
156 unsigned long event);
157static int addrconf_ifdown(struct net_device *dev, int how);
158
159static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
160 int plen,
161 const struct net_device *dev,
162 u32 flags, u32 noflags);
163
164static void addrconf_dad_start(struct inet6_ifaddr *ifp);
165static void addrconf_dad_work(struct work_struct *w);
166static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
167static void addrconf_dad_run(struct inet6_dev *idev);
168static void addrconf_rs_timer(unsigned long data);
169static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
171
172static void inet6_prefix_notify(int event, struct inet6_dev *idev,
173 struct prefix_info *pinfo);
174static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175 struct net_device *dev);
176
177static struct ipv6_devconf ipv6_devconf __read_mostly = {
178 .forwarding = 0,
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
181 .accept_ra = 1,
182 .accept_redirects = 1,
183 .autoconf = 1,
184 .force_mld_version = 0,
185 .mldv1_unsolicited_report_interval = 10 * HZ,
186 .mldv2_unsolicited_report_interval = HZ,
187 .dad_transmits = 1,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
191 .use_tempaddr = 0,
192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
196 .max_addresses = IPV6_MAX_ADDRESSES,
197 .accept_ra_defrtr = 1,
198 .accept_ra_from_local = 0,
199 .accept_ra_min_hop_limit= 1,
200 .accept_ra_pinfo = 1,
201#ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
203 .rtr_probe_interval = 60 * HZ,
204#ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
206#endif
207#endif
208 .proxy_ndp = 0,
209 .accept_source_route = 0, /* we do not accept RH0 by default. */
210 .disable_ipv6 = 0,
211 .accept_dad = 1,
212 .suppress_frag_ndisc = 1,
213 .accept_ra_mtu = 1,
214 .stable_secret = {
215 .initialized = false,
216 },
217 .use_oif_addrs_only = 0,
218 .ignore_routes_with_linkdown = 0,
219};
220
221static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
222 .forwarding = 0,
223 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
224 .mtu6 = IPV6_MIN_MTU,
225 .accept_ra = 1,
226 .accept_redirects = 1,
227 .autoconf = 1,
228 .force_mld_version = 0,
229 .mldv1_unsolicited_report_interval = 10 * HZ,
230 .mldv2_unsolicited_report_interval = HZ,
231 .dad_transmits = 1,
232 .rtr_solicits = MAX_RTR_SOLICITATIONS,
233 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
234 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
235 .use_tempaddr = 0,
236 .temp_valid_lft = TEMP_VALID_LIFETIME,
237 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
238 .regen_max_retry = REGEN_MAX_RETRY,
239 .max_desync_factor = MAX_DESYNC_FACTOR,
240 .max_addresses = IPV6_MAX_ADDRESSES,
241 .accept_ra_defrtr = 1,
242 .accept_ra_from_local = 0,
243 .accept_ra_min_hop_limit= 1,
244 .accept_ra_pinfo = 1,
245#ifdef CONFIG_IPV6_ROUTER_PREF
246 .accept_ra_rtr_pref = 1,
247 .rtr_probe_interval = 60 * HZ,
248#ifdef CONFIG_IPV6_ROUTE_INFO
249 .accept_ra_rt_info_max_plen = 0,
250#endif
251#endif
252 .proxy_ndp = 0,
253 .accept_source_route = 0, /* we do not accept RH0 by default. */
254 .disable_ipv6 = 0,
255 .accept_dad = 1,
256 .suppress_frag_ndisc = 1,
257 .accept_ra_mtu = 1,
258 .stable_secret = {
259 .initialized = false,
260 },
261 .use_oif_addrs_only = 0,
262 .ignore_routes_with_linkdown = 0,
263};
264
265/* Check if a valid qdisc is available */
266static inline bool addrconf_qdisc_ok(const struct net_device *dev)
267{
268 return !qdisc_tx_is_noop(dev);
269}
270
271static void addrconf_del_rs_timer(struct inet6_dev *idev)
272{
273 if (del_timer(&idev->rs_timer))
274 __in6_dev_put(idev);
275}
276
277static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
278{
279 if (cancel_delayed_work(&ifp->dad_work))
280 __in6_ifa_put(ifp);
281}
282
283static void addrconf_mod_rs_timer(struct inet6_dev *idev,
284 unsigned long when)
285{
286 if (!timer_pending(&idev->rs_timer))
287 in6_dev_hold(idev);
288 mod_timer(&idev->rs_timer, jiffies + when);
289}
290
291static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
292 unsigned long delay)
293{
294 if (!delayed_work_pending(&ifp->dad_work))
295 in6_ifa_hold(ifp);
296 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
297}
298
299static int snmp6_alloc_dev(struct inet6_dev *idev)
300{
301 int i;
302
303 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
304 if (!idev->stats.ipv6)
305 goto err_ip;
306
307 for_each_possible_cpu(i) {
308 struct ipstats_mib *addrconf_stats;
309 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
310 u64_stats_init(&addrconf_stats->syncp);
311 }
312
313
314 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
315 GFP_KERNEL);
316 if (!idev->stats.icmpv6dev)
317 goto err_icmp;
318 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
319 GFP_KERNEL);
320 if (!idev->stats.icmpv6msgdev)
321 goto err_icmpmsg;
322
323 return 0;
324
325err_icmpmsg:
326 kfree(idev->stats.icmpv6dev);
327err_icmp:
328 free_percpu(idev->stats.ipv6);
329err_ip:
330 return -ENOMEM;
331}
332
333static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
334{
335 struct inet6_dev *ndev;
336 int err = -ENOMEM;
337
338 ASSERT_RTNL();
339
340 if (dev->mtu < IPV6_MIN_MTU)
341 return ERR_PTR(-EINVAL);
342
343 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
344 if (!ndev)
345 return ERR_PTR(err);
346
347 rwlock_init(&ndev->lock);
348 ndev->dev = dev;
349 INIT_LIST_HEAD(&ndev->addr_list);
350 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
351 (unsigned long)ndev);
352 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
353 ndev->cnf.mtu6 = dev->mtu;
354 ndev->cnf.sysctl = NULL;
355 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
356 if (!ndev->nd_parms) {
357 kfree(ndev);
358 return ERR_PTR(err);
359 }
360 if (ndev->cnf.forwarding)
361 dev_disable_lro(dev);
362 /* We refer to the device */
363 dev_hold(dev);
364
365 if (snmp6_alloc_dev(ndev) < 0) {
366 ADBG(KERN_WARNING
367 "%s: cannot allocate memory for statistics; dev=%s.\n",
368 __func__, dev->name);
369 neigh_parms_release(&nd_tbl, ndev->nd_parms);
370 dev_put(dev);
371 kfree(ndev);
372 return ERR_PTR(err);
373 }
374
375 if (snmp6_register_dev(ndev) < 0) {
376 ADBG(KERN_WARNING
377 "%s: cannot create /proc/net/dev_snmp6/%s\n",
378 __func__, dev->name);
379 goto err_release;
380 }
381
382 /* One reference from device. We must do this before
383 * we invoke __ipv6_regen_rndid().
384 */
385 in6_dev_hold(ndev);
386
387 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
388 ndev->cnf.accept_dad = -1;
389
390#if IS_ENABLED(CONFIG_IPV6_SIT)
391 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
392 pr_info("%s: Disabled Multicast RS\n", dev->name);
393 ndev->cnf.rtr_solicits = 0;
394 }
395#endif
396
397 INIT_LIST_HEAD(&ndev->tempaddr_list);
398 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
399 if ((dev->flags&IFF_LOOPBACK) ||
400 dev->type == ARPHRD_TUNNEL ||
401 dev->type == ARPHRD_TUNNEL6 ||
402 dev->type == ARPHRD_SIT ||
403 dev->type == ARPHRD_NONE) {
404 ndev->cnf.use_tempaddr = -1;
405 } else {
406 in6_dev_hold(ndev);
407 ipv6_regen_rndid((unsigned long) ndev);
408 }
409
410 ndev->token = in6addr_any;
411
412 if (netif_running(dev) && addrconf_qdisc_ok(dev))
413 ndev->if_flags |= IF_READY;
414
415 ipv6_mc_init_dev(ndev);
416 ndev->tstamp = jiffies;
417 err = addrconf_sysctl_register(ndev);
418 if (err) {
419 ipv6_mc_destroy_dev(ndev);
420 del_timer(&ndev->regen_timer);
421 goto err_release;
422 }
423 /* protected by rtnl_lock */
424 rcu_assign_pointer(dev->ip6_ptr, ndev);
425
426 /* Join interface-local all-node multicast group */
427 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
428
429 /* Join all-node multicast group */
430 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
431
432 /* Join all-router multicast group if forwarding is set */
433 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
434 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
435
436 return ndev;
437
438err_release:
439 neigh_parms_release(&nd_tbl, ndev->nd_parms);
440 ndev->dead = 1;
441 in6_dev_finish_destroy(ndev);
442 return ERR_PTR(err);
443}
444
445static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
446{
447 struct inet6_dev *idev;
448
449 ASSERT_RTNL();
450
451 idev = __in6_dev_get(dev);
452 if (!idev) {
453 idev = ipv6_add_dev(dev);
454 if (IS_ERR(idev))
455 return NULL;
456 }
457
458 if (dev->flags&IFF_UP)
459 ipv6_mc_up(idev);
460 return idev;
461}
462
463static int inet6_netconf_msgsize_devconf(int type)
464{
465 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
466 + nla_total_size(4); /* NETCONFA_IFINDEX */
467
468 /* type -1 is used for ALL */
469 if (type == -1 || type == NETCONFA_FORWARDING)
470 size += nla_total_size(4);
471#ifdef CONFIG_IPV6_MROUTE
472 if (type == -1 || type == NETCONFA_MC_FORWARDING)
473 size += nla_total_size(4);
474#endif
475 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
476 size += nla_total_size(4);
477
478 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
479 size += nla_total_size(4);
480
481 return size;
482}
483
484static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
485 struct ipv6_devconf *devconf, u32 portid,
486 u32 seq, int event, unsigned int flags,
487 int type)
488{
489 struct nlmsghdr *nlh;
490 struct netconfmsg *ncm;
491
492 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
493 flags);
494 if (!nlh)
495 return -EMSGSIZE;
496
497 ncm = nlmsg_data(nlh);
498 ncm->ncm_family = AF_INET6;
499
500 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
501 goto nla_put_failure;
502
503 /* type -1 is used for ALL */
504 if ((type == -1 || type == NETCONFA_FORWARDING) &&
505 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
506 goto nla_put_failure;
507#ifdef CONFIG_IPV6_MROUTE
508 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
509 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
510 devconf->mc_forwarding) < 0)
511 goto nla_put_failure;
512#endif
513 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
514 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
515 goto nla_put_failure;
516
517 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
518 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
519 devconf->ignore_routes_with_linkdown) < 0)
520 goto nla_put_failure;
521
522 nlmsg_end(skb, nlh);
523 return 0;
524
525nla_put_failure:
526 nlmsg_cancel(skb, nlh);
527 return -EMSGSIZE;
528}
529
530void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
531 struct ipv6_devconf *devconf)
532{
533 struct sk_buff *skb;
534 int err = -ENOBUFS;
535
536 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
537 if (!skb)
538 goto errout;
539
540 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
541 RTM_NEWNETCONF, 0, type);
542 if (err < 0) {
543 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
544 WARN_ON(err == -EMSGSIZE);
545 kfree_skb(skb);
546 goto errout;
547 }
548 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
549 return;
550errout:
551 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
552}
553
554static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
555 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
556 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
557 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
558 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
559};
560
561static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
562 struct nlmsghdr *nlh)
563{
564 struct net *net = sock_net(in_skb->sk);
565 struct nlattr *tb[NETCONFA_MAX+1];
566 struct netconfmsg *ncm;
567 struct sk_buff *skb;
568 struct ipv6_devconf *devconf;
569 struct inet6_dev *in6_dev;
570 struct net_device *dev;
571 int ifindex;
572 int err;
573
574 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
575 devconf_ipv6_policy);
576 if (err < 0)
577 goto errout;
578
579 err = EINVAL;
580 if (!tb[NETCONFA_IFINDEX])
581 goto errout;
582
583 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
584 switch (ifindex) {
585 case NETCONFA_IFINDEX_ALL:
586 devconf = net->ipv6.devconf_all;
587 break;
588 case NETCONFA_IFINDEX_DEFAULT:
589 devconf = net->ipv6.devconf_dflt;
590 break;
591 default:
592 dev = __dev_get_by_index(net, ifindex);
593 if (!dev)
594 goto errout;
595 in6_dev = __in6_dev_get(dev);
596 if (!in6_dev)
597 goto errout;
598 devconf = &in6_dev->cnf;
599 break;
600 }
601
602 err = -ENOBUFS;
603 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
604 if (!skb)
605 goto errout;
606
607 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
608 NETLINK_CB(in_skb).portid,
609 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
610 -1);
611 if (err < 0) {
612 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
613 WARN_ON(err == -EMSGSIZE);
614 kfree_skb(skb);
615 goto errout;
616 }
617 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
618errout:
619 return err;
620}
621
622static int inet6_netconf_dump_devconf(struct sk_buff *skb,
623 struct netlink_callback *cb)
624{
625 struct net *net = sock_net(skb->sk);
626 int h, s_h;
627 int idx, s_idx;
628 struct net_device *dev;
629 struct inet6_dev *idev;
630 struct hlist_head *head;
631
632 s_h = cb->args[0];
633 s_idx = idx = cb->args[1];
634
635 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
636 idx = 0;
637 head = &net->dev_index_head[h];
638 rcu_read_lock();
639 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
640 net->dev_base_seq;
641 hlist_for_each_entry_rcu(dev, head, index_hlist) {
642 if (idx < s_idx)
643 goto cont;
644 idev = __in6_dev_get(dev);
645 if (!idev)
646 goto cont;
647
648 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
649 &idev->cnf,
650 NETLINK_CB(cb->skb).portid,
651 cb->nlh->nlmsg_seq,
652 RTM_NEWNETCONF,
653 NLM_F_MULTI,
654 -1) < 0) {
655 rcu_read_unlock();
656 goto done;
657 }
658 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
659cont:
660 idx++;
661 }
662 rcu_read_unlock();
663 }
664 if (h == NETDEV_HASHENTRIES) {
665 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
666 net->ipv6.devconf_all,
667 NETLINK_CB(cb->skb).portid,
668 cb->nlh->nlmsg_seq,
669 RTM_NEWNETCONF, NLM_F_MULTI,
670 -1) < 0)
671 goto done;
672 else
673 h++;
674 }
675 if (h == NETDEV_HASHENTRIES + 1) {
676 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
677 net->ipv6.devconf_dflt,
678 NETLINK_CB(cb->skb).portid,
679 cb->nlh->nlmsg_seq,
680 RTM_NEWNETCONF, NLM_F_MULTI,
681 -1) < 0)
682 goto done;
683 else
684 h++;
685 }
686done:
687 cb->args[0] = h;
688 cb->args[1] = idx;
689
690 return skb->len;
691}
692
693#ifdef CONFIG_SYSCTL
694static void dev_forward_change(struct inet6_dev *idev)
695{
696 struct net_device *dev;
697 struct inet6_ifaddr *ifa;
698
699 if (!idev)
700 return;
701 dev = idev->dev;
702 if (idev->cnf.forwarding)
703 dev_disable_lro(dev);
704 if (dev->flags & IFF_MULTICAST) {
705 if (idev->cnf.forwarding) {
706 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
707 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
708 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
709 } else {
710 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
711 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
712 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
713 }
714 }
715
716 list_for_each_entry(ifa, &idev->addr_list, if_list) {
717 if (ifa->flags&IFA_F_TENTATIVE)
718 continue;
719 if (idev->cnf.forwarding)
720 addrconf_join_anycast(ifa);
721 else
722 addrconf_leave_anycast(ifa);
723 }
724 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
725 dev->ifindex, &idev->cnf);
726}
727
728
729static void addrconf_forward_change(struct net *net, __s32 newf)
730{
731 struct net_device *dev;
732 struct inet6_dev *idev;
733
734 for_each_netdev(net, dev) {
735 idev = __in6_dev_get(dev);
736 if (idev) {
737 int changed = (!idev->cnf.forwarding) ^ (!newf);
738 idev->cnf.forwarding = newf;
739 if (changed)
740 dev_forward_change(idev);
741 }
742 }
743}
744
745static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
746{
747 struct net *net;
748 int old;
749
750 if (!rtnl_trylock())
751 return restart_syscall();
752
753 net = (struct net *)table->extra2;
754 old = *p;
755 *p = newf;
756
757 if (p == &net->ipv6.devconf_dflt->forwarding) {
758 if ((!newf) ^ (!old))
759 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
760 NETCONFA_IFINDEX_DEFAULT,
761 net->ipv6.devconf_dflt);
762 rtnl_unlock();
763 return 0;
764 }
765
766 if (p == &net->ipv6.devconf_all->forwarding) {
767 net->ipv6.devconf_dflt->forwarding = newf;
768 addrconf_forward_change(net, newf);
769 if ((!newf) ^ (!old))
770 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
771 NETCONFA_IFINDEX_ALL,
772 net->ipv6.devconf_all);
773 } else if ((!newf) ^ (!old))
774 dev_forward_change((struct inet6_dev *)table->extra1);
775 rtnl_unlock();
776
777 if (newf)
778 rt6_purge_dflt_routers(net);
779 return 1;
780}
781
782static void addrconf_linkdown_change(struct net *net, __s32 newf)
783{
784 struct net_device *dev;
785 struct inet6_dev *idev;
786
787 for_each_netdev(net, dev) {
788 idev = __in6_dev_get(dev);
789 if (idev) {
790 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
791
792 idev->cnf.ignore_routes_with_linkdown = newf;
793 if (changed)
794 inet6_netconf_notify_devconf(dev_net(dev),
795 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
796 dev->ifindex,
797 &idev->cnf);
798 }
799 }
800}
801
802static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
803{
804 struct net *net;
805 int old;
806
807 if (!rtnl_trylock())
808 return restart_syscall();
809
810 net = (struct net *)table->extra2;
811 old = *p;
812 *p = newf;
813
814 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
815 if ((!newf) ^ (!old))
816 inet6_netconf_notify_devconf(net,
817 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
818 NETCONFA_IFINDEX_DEFAULT,
819 net->ipv6.devconf_dflt);
820 rtnl_unlock();
821 return 0;
822 }
823
824 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
825 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
826 addrconf_linkdown_change(net, newf);
827 if ((!newf) ^ (!old))
828 inet6_netconf_notify_devconf(net,
829 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
830 NETCONFA_IFINDEX_ALL,
831 net->ipv6.devconf_all);
832 }
833 rtnl_unlock();
834
835 return 1;
836}
837
838#endif
839
840/* Nobody refers to this ifaddr, destroy it */
841void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
842{
843 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
844
845#ifdef NET_REFCNT_DEBUG
846 pr_debug("%s\n", __func__);
847#endif
848
849 in6_dev_put(ifp->idev);
850
851 if (cancel_delayed_work(&ifp->dad_work))
852 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
853 ifp);
854
855 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
856 pr_warn("Freeing alive inet6 address %p\n", ifp);
857 return;
858 }
859 ip6_rt_put(ifp->rt);
860
861 kfree_rcu(ifp, rcu);
862}
863
864static void
865ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
866{
867 struct list_head *p;
868 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
869
870 /*
871 * Each device address list is sorted in order of scope -
872 * global before linklocal.
873 */
874 list_for_each(p, &idev->addr_list) {
875 struct inet6_ifaddr *ifa
876 = list_entry(p, struct inet6_ifaddr, if_list);
877 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
878 break;
879 }
880
881 list_add_tail(&ifp->if_list, p);
882}
883
884static u32 inet6_addr_hash(const struct in6_addr *addr)
885{
886 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
887}
888
889/* On success it returns ifp with increased reference count */
890
891static struct inet6_ifaddr *
892ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
893 const struct in6_addr *peer_addr, int pfxlen,
894 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
895{
896 struct inet6_ifaddr *ifa = NULL;
897 struct rt6_info *rt;
898 unsigned int hash;
899 int err = 0;
900 int addr_type = ipv6_addr_type(addr);
901
902 if (addr_type == IPV6_ADDR_ANY ||
903 addr_type & IPV6_ADDR_MULTICAST ||
904 (!(idev->dev->flags & IFF_LOOPBACK) &&
905 addr_type & IPV6_ADDR_LOOPBACK))
906 return ERR_PTR(-EADDRNOTAVAIL);
907
908 rcu_read_lock_bh();
909 if (idev->dead) {
910 err = -ENODEV; /*XXX*/
911 goto out2;
912 }
913
914 if (idev->cnf.disable_ipv6) {
915 err = -EACCES;
916 goto out2;
917 }
918
919 spin_lock(&addrconf_hash_lock);
920
921 /* Ignore adding duplicate addresses on an interface */
922 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
923 ADBG("ipv6_add_addr: already assigned\n");
924 err = -EEXIST;
925 goto out;
926 }
927
928 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
929
930 if (!ifa) {
931 ADBG("ipv6_add_addr: malloc failed\n");
932 err = -ENOBUFS;
933 goto out;
934 }
935
936 rt = addrconf_dst_alloc(idev, addr, false);
937 if (IS_ERR(rt)) {
938 err = PTR_ERR(rt);
939 goto out;
940 }
941
942 neigh_parms_data_state_setall(idev->nd_parms);
943
944 ifa->addr = *addr;
945 if (peer_addr)
946 ifa->peer_addr = *peer_addr;
947
948 spin_lock_init(&ifa->lock);
949 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
950 INIT_HLIST_NODE(&ifa->addr_lst);
951 ifa->scope = scope;
952 ifa->prefix_len = pfxlen;
953 ifa->flags = flags | IFA_F_TENTATIVE;
954 ifa->valid_lft = valid_lft;
955 ifa->prefered_lft = prefered_lft;
956 ifa->cstamp = ifa->tstamp = jiffies;
957 ifa->tokenized = false;
958
959 ifa->rt = rt;
960
961 ifa->idev = idev;
962 in6_dev_hold(idev);
963 /* For caller */
964 in6_ifa_hold(ifa);
965
966 /* Add to big hash table */
967 hash = inet6_addr_hash(addr);
968
969 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
970 spin_unlock(&addrconf_hash_lock);
971
972 write_lock(&idev->lock);
973 /* Add to inet6_dev unicast addr list. */
974 ipv6_link_dev_addr(idev, ifa);
975
976 if (ifa->flags&IFA_F_TEMPORARY) {
977 list_add(&ifa->tmp_list, &idev->tempaddr_list);
978 in6_ifa_hold(ifa);
979 }
980
981 in6_ifa_hold(ifa);
982 write_unlock(&idev->lock);
983out2:
984 rcu_read_unlock_bh();
985
986 if (likely(err == 0))
987 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
988 else {
989 kfree(ifa);
990 ifa = ERR_PTR(err);
991 }
992
993 return ifa;
994out:
995 spin_unlock(&addrconf_hash_lock);
996 goto out2;
997}
998
999enum cleanup_prefix_rt_t {
1000 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1001 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1002 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1003};
1004
1005/*
1006 * Check, whether the prefix for ifp would still need a prefix route
1007 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1008 * constants.
1009 *
1010 * 1) we don't purge prefix if address was not permanent.
1011 * prefix is managed by its own lifetime.
1012 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1013 * 3) if there are no addresses, delete prefix.
1014 * 4) if there are still other permanent address(es),
1015 * corresponding prefix is still permanent.
1016 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1017 * don't purge the prefix, assume user space is managing it.
1018 * 6) otherwise, update prefix lifetime to the
1019 * longest valid lifetime among the corresponding
1020 * addresses on the device.
1021 * Note: subsequent RA will update lifetime.
1022 **/
1023static enum cleanup_prefix_rt_t
1024check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1025{
1026 struct inet6_ifaddr *ifa;
1027 struct inet6_dev *idev = ifp->idev;
1028 unsigned long lifetime;
1029 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1030
1031 *expires = jiffies;
1032
1033 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1034 if (ifa == ifp)
1035 continue;
1036 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1037 ifp->prefix_len))
1038 continue;
1039 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1040 return CLEANUP_PREFIX_RT_NOP;
1041
1042 action = CLEANUP_PREFIX_RT_EXPIRE;
1043
1044 spin_lock(&ifa->lock);
1045
1046 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1047 /*
1048 * Note: Because this address is
1049 * not permanent, lifetime <
1050 * LONG_MAX / HZ here.
1051 */
1052 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1053 *expires = ifa->tstamp + lifetime * HZ;
1054 spin_unlock(&ifa->lock);
1055 }
1056
1057 return action;
1058}
1059
1060static void
1061cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1062{
1063 struct rt6_info *rt;
1064
1065 rt = addrconf_get_prefix_route(&ifp->addr,
1066 ifp->prefix_len,
1067 ifp->idev->dev,
1068 0, RTF_GATEWAY | RTF_DEFAULT);
1069 if (rt) {
1070 if (del_rt)
1071 ip6_del_rt(rt);
1072 else {
1073 if (!(rt->rt6i_flags & RTF_EXPIRES))
1074 rt6_set_expires(rt, expires);
1075 ip6_rt_put(rt);
1076 }
1077 }
1078}
1079
1080
1081/* This function wants to get referenced ifp and releases it before return */
1082
1083static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1084{
1085 int state;
1086 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1087 unsigned long expires;
1088
1089 ASSERT_RTNL();
1090
1091 spin_lock_bh(&ifp->lock);
1092 state = ifp->state;
1093 ifp->state = INET6_IFADDR_STATE_DEAD;
1094 spin_unlock_bh(&ifp->lock);
1095
1096 if (state == INET6_IFADDR_STATE_DEAD)
1097 goto out;
1098
1099 spin_lock_bh(&addrconf_hash_lock);
1100 hlist_del_init_rcu(&ifp->addr_lst);
1101 spin_unlock_bh(&addrconf_hash_lock);
1102
1103 write_lock_bh(&ifp->idev->lock);
1104
1105 if (ifp->flags&IFA_F_TEMPORARY) {
1106 list_del(&ifp->tmp_list);
1107 if (ifp->ifpub) {
1108 in6_ifa_put(ifp->ifpub);
1109 ifp->ifpub = NULL;
1110 }
1111 __in6_ifa_put(ifp);
1112 }
1113
1114 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1115 action = check_cleanup_prefix_route(ifp, &expires);
1116
1117 list_del_init(&ifp->if_list);
1118 __in6_ifa_put(ifp);
1119
1120 write_unlock_bh(&ifp->idev->lock);
1121
1122 addrconf_del_dad_work(ifp);
1123
1124 ipv6_ifa_notify(RTM_DELADDR, ifp);
1125
1126 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1127
1128 if (action != CLEANUP_PREFIX_RT_NOP) {
1129 cleanup_prefix_route(ifp, expires,
1130 action == CLEANUP_PREFIX_RT_DEL);
1131 }
1132
1133 /* clean up prefsrc entries */
1134 rt6_remove_prefsrc(ifp);
1135out:
1136 in6_ifa_put(ifp);
1137}
1138
1139static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1140{
1141 struct inet6_dev *idev = ifp->idev;
1142 struct in6_addr addr, *tmpaddr;
1143 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1144 unsigned long regen_advance;
1145 int tmp_plen;
1146 int ret = 0;
1147 u32 addr_flags;
1148 unsigned long now = jiffies;
1149
1150 write_lock_bh(&idev->lock);
1151 if (ift) {
1152 spin_lock_bh(&ift->lock);
1153 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1154 spin_unlock_bh(&ift->lock);
1155 tmpaddr = &addr;
1156 } else {
1157 tmpaddr = NULL;
1158 }
1159retry:
1160 in6_dev_hold(idev);
1161 if (idev->cnf.use_tempaddr <= 0) {
1162 write_unlock_bh(&idev->lock);
1163 pr_info("%s: use_tempaddr is disabled\n", __func__);
1164 in6_dev_put(idev);
1165 ret = -1;
1166 goto out;
1167 }
1168 spin_lock_bh(&ifp->lock);
1169 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1170 idev->cnf.use_tempaddr = -1; /*XXX*/
1171 spin_unlock_bh(&ifp->lock);
1172 write_unlock_bh(&idev->lock);
1173 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1174 __func__);
1175 in6_dev_put(idev);
1176 ret = -1;
1177 goto out;
1178 }
1179 in6_ifa_hold(ifp);
1180 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1181 __ipv6_try_regen_rndid(idev, tmpaddr);
1182 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1183 age = (now - ifp->tstamp) / HZ;
1184 tmp_valid_lft = min_t(__u32,
1185 ifp->valid_lft,
1186 idev->cnf.temp_valid_lft + age);
1187 tmp_prefered_lft = min_t(__u32,
1188 ifp->prefered_lft,
1189 idev->cnf.temp_prefered_lft + age -
1190 idev->cnf.max_desync_factor);
1191 tmp_plen = ifp->prefix_len;
1192 tmp_tstamp = ifp->tstamp;
1193 spin_unlock_bh(&ifp->lock);
1194
1195 regen_advance = idev->cnf.regen_max_retry *
1196 idev->cnf.dad_transmits *
1197 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1198 write_unlock_bh(&idev->lock);
1199
1200 /* A temporary address is created only if this calculated Preferred
1201 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1202 * an implementation must not create a temporary address with a zero
1203 * Preferred Lifetime.
1204 * Use age calculation as in addrconf_verify to avoid unnecessary
1205 * temporary addresses being generated.
1206 */
1207 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1208 if (tmp_prefered_lft <= regen_advance + age) {
1209 in6_ifa_put(ifp);
1210 in6_dev_put(idev);
1211 ret = -1;
1212 goto out;
1213 }
1214
1215 addr_flags = IFA_F_TEMPORARY;
1216 /* set in addrconf_prefix_rcv() */
1217 if (ifp->flags & IFA_F_OPTIMISTIC)
1218 addr_flags |= IFA_F_OPTIMISTIC;
1219
1220 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1221 ipv6_addr_scope(&addr), addr_flags,
1222 tmp_valid_lft, tmp_prefered_lft);
1223 if (IS_ERR(ift)) {
1224 in6_ifa_put(ifp);
1225 in6_dev_put(idev);
1226 pr_info("%s: retry temporary address regeneration\n", __func__);
1227 tmpaddr = &addr;
1228 write_lock_bh(&idev->lock);
1229 goto retry;
1230 }
1231
1232 spin_lock_bh(&ift->lock);
1233 ift->ifpub = ifp;
1234 ift->cstamp = now;
1235 ift->tstamp = tmp_tstamp;
1236 spin_unlock_bh(&ift->lock);
1237
1238 addrconf_dad_start(ift);
1239 in6_ifa_put(ift);
1240 in6_dev_put(idev);
1241out:
1242 return ret;
1243}
1244
1245/*
1246 * Choose an appropriate source address (RFC3484)
1247 */
1248enum {
1249 IPV6_SADDR_RULE_INIT = 0,
1250 IPV6_SADDR_RULE_LOCAL,
1251 IPV6_SADDR_RULE_SCOPE,
1252 IPV6_SADDR_RULE_PREFERRED,
1253#ifdef CONFIG_IPV6_MIP6
1254 IPV6_SADDR_RULE_HOA,
1255#endif
1256 IPV6_SADDR_RULE_OIF,
1257 IPV6_SADDR_RULE_LABEL,
1258 IPV6_SADDR_RULE_PRIVACY,
1259 IPV6_SADDR_RULE_ORCHID,
1260 IPV6_SADDR_RULE_PREFIX,
1261#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1262 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1263#endif
1264 IPV6_SADDR_RULE_MAX
1265};
1266
1267struct ipv6_saddr_score {
1268 int rule;
1269 int addr_type;
1270 struct inet6_ifaddr *ifa;
1271 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1272 int scopedist;
1273 int matchlen;
1274};
1275
1276struct ipv6_saddr_dst {
1277 const struct in6_addr *addr;
1278 int ifindex;
1279 int scope;
1280 int label;
1281 unsigned int prefs;
1282};
1283
1284static inline int ipv6_saddr_preferred(int type)
1285{
1286 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1287 return 1;
1288 return 0;
1289}
1290
1291static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1292{
1293#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1294 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1295#else
1296 return false;
1297#endif
1298}
1299
1300static int ipv6_get_saddr_eval(struct net *net,
1301 struct ipv6_saddr_score *score,
1302 struct ipv6_saddr_dst *dst,
1303 int i)
1304{
1305 int ret;
1306
1307 if (i <= score->rule) {
1308 switch (i) {
1309 case IPV6_SADDR_RULE_SCOPE:
1310 ret = score->scopedist;
1311 break;
1312 case IPV6_SADDR_RULE_PREFIX:
1313 ret = score->matchlen;
1314 break;
1315 default:
1316 ret = !!test_bit(i, score->scorebits);
1317 }
1318 goto out;
1319 }
1320
1321 switch (i) {
1322 case IPV6_SADDR_RULE_INIT:
1323 /* Rule 0: remember if hiscore is not ready yet */
1324 ret = !!score->ifa;
1325 break;
1326 case IPV6_SADDR_RULE_LOCAL:
1327 /* Rule 1: Prefer same address */
1328 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1329 break;
1330 case IPV6_SADDR_RULE_SCOPE:
1331 /* Rule 2: Prefer appropriate scope
1332 *
1333 * ret
1334 * ^
1335 * -1 | d 15
1336 * ---+--+-+---> scope
1337 * |
1338 * | d is scope of the destination.
1339 * B-d | \
1340 * | \ <- smaller scope is better if
1341 * B-15 | \ if scope is enough for destination.
1342 * | ret = B - scope (-1 <= scope >= d <= 15).
1343 * d-C-1 | /
1344 * |/ <- greater is better
1345 * -C / if scope is not enough for destination.
1346 * /| ret = scope - C (-1 <= d < scope <= 15).
1347 *
1348 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1349 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1350 * Assume B = 0 and we get C > 29.
1351 */
1352 ret = __ipv6_addr_src_scope(score->addr_type);
1353 if (ret >= dst->scope)
1354 ret = -ret;
1355 else
1356 ret -= 128; /* 30 is enough */
1357 score->scopedist = ret;
1358 break;
1359 case IPV6_SADDR_RULE_PREFERRED:
1360 {
1361 /* Rule 3: Avoid deprecated and optimistic addresses */
1362 u8 avoid = IFA_F_DEPRECATED;
1363
1364 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1365 avoid |= IFA_F_OPTIMISTIC;
1366 ret = ipv6_saddr_preferred(score->addr_type) ||
1367 !(score->ifa->flags & avoid);
1368 break;
1369 }
1370#ifdef CONFIG_IPV6_MIP6
1371 case IPV6_SADDR_RULE_HOA:
1372 {
1373 /* Rule 4: Prefer home address */
1374 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1375 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1376 break;
1377 }
1378#endif
1379 case IPV6_SADDR_RULE_OIF:
1380 /* Rule 5: Prefer outgoing interface */
1381 ret = (!dst->ifindex ||
1382 dst->ifindex == score->ifa->idev->dev->ifindex);
1383 break;
1384 case IPV6_SADDR_RULE_LABEL:
1385 /* Rule 6: Prefer matching label */
1386 ret = ipv6_addr_label(net,
1387 &score->ifa->addr, score->addr_type,
1388 score->ifa->idev->dev->ifindex) == dst->label;
1389 break;
1390 case IPV6_SADDR_RULE_PRIVACY:
1391 {
1392 /* Rule 7: Prefer public address
1393 * Note: prefer temporary address if use_tempaddr >= 2
1394 */
1395 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1396 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1397 score->ifa->idev->cnf.use_tempaddr >= 2;
1398 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1399 break;
1400 }
1401 case IPV6_SADDR_RULE_ORCHID:
1402 /* Rule 8-: Prefer ORCHID vs ORCHID or
1403 * non-ORCHID vs non-ORCHID
1404 */
1405 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1406 ipv6_addr_orchid(dst->addr));
1407 break;
1408 case IPV6_SADDR_RULE_PREFIX:
1409 /* Rule 8: Use longest matching prefix */
1410 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1411 if (ret > score->ifa->prefix_len)
1412 ret = score->ifa->prefix_len;
1413 score->matchlen = ret;
1414 break;
1415#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1416 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1417 /* Optimistic addresses still have lower precedence than other
1418 * preferred addresses.
1419 */
1420 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1421 break;
1422#endif
1423 default:
1424 ret = 0;
1425 }
1426
1427 if (ret)
1428 __set_bit(i, score->scorebits);
1429 score->rule = i;
1430out:
1431 return ret;
1432}
1433
1434static int __ipv6_dev_get_saddr(struct net *net,
1435 struct ipv6_saddr_dst *dst,
1436 struct inet6_dev *idev,
1437 struct ipv6_saddr_score *scores,
1438 int hiscore_idx)
1439{
1440 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1441
1442 read_lock_bh(&idev->lock);
1443 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1444 int i;
1445
1446 /*
1447 * - Tentative Address (RFC2462 section 5.4)
1448 * - A tentative address is not considered
1449 * "assigned to an interface" in the traditional
1450 * sense, unless it is also flagged as optimistic.
1451 * - Candidate Source Address (section 4)
1452 * - In any case, anycast addresses, multicast
1453 * addresses, and the unspecified address MUST
1454 * NOT be included in a candidate set.
1455 */
1456 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1457 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1458 continue;
1459
1460 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1461
1462 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1463 score->addr_type & IPV6_ADDR_MULTICAST)) {
1464 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1465 idev->dev->name);
1466 continue;
1467 }
1468
1469 score->rule = -1;
1470 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1471
1472 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1473 int minihiscore, miniscore;
1474
1475 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1476 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1477
1478 if (minihiscore > miniscore) {
1479 if (i == IPV6_SADDR_RULE_SCOPE &&
1480 score->scopedist > 0) {
1481 /*
1482 * special case:
1483 * each remaining entry
1484 * has too small (not enough)
1485 * scope, because ifa entries
1486 * are sorted by their scope
1487 * values.
1488 */
1489 goto out;
1490 }
1491 break;
1492 } else if (minihiscore < miniscore) {
1493 if (hiscore->ifa)
1494 in6_ifa_put(hiscore->ifa);
1495
1496 in6_ifa_hold(score->ifa);
1497
1498 swap(hiscore, score);
1499 hiscore_idx = 1 - hiscore_idx;
1500
1501 /* restore our iterator */
1502 score->ifa = hiscore->ifa;
1503
1504 break;
1505 }
1506 }
1507 }
1508out:
1509 read_unlock_bh(&idev->lock);
1510 return hiscore_idx;
1511}
1512
1513int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1514 const struct in6_addr *daddr, unsigned int prefs,
1515 struct in6_addr *saddr)
1516{
1517 struct ipv6_saddr_score scores[2], *hiscore;
1518 struct ipv6_saddr_dst dst;
1519 struct inet6_dev *idev;
1520 struct net_device *dev;
1521 int dst_type;
1522 bool use_oif_addr = false;
1523 int hiscore_idx = 0;
1524
1525 dst_type = __ipv6_addr_type(daddr);
1526 dst.addr = daddr;
1527 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1528 dst.scope = __ipv6_addr_src_scope(dst_type);
1529 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1530 dst.prefs = prefs;
1531
1532 scores[hiscore_idx].rule = -1;
1533 scores[hiscore_idx].ifa = NULL;
1534
1535 rcu_read_lock();
1536
1537 /* Candidate Source Address (section 4)
1538 * - multicast and link-local destination address,
1539 * the set of candidate source address MUST only
1540 * include addresses assigned to interfaces
1541 * belonging to the same link as the outgoing
1542 * interface.
1543 * (- For site-local destination addresses, the
1544 * set of candidate source addresses MUST only
1545 * include addresses assigned to interfaces
1546 * belonging to the same site as the outgoing
1547 * interface.)
1548 * - "It is RECOMMENDED that the candidate source addresses
1549 * be the set of unicast addresses assigned to the
1550 * interface that will be used to send to the destination
1551 * (the 'outgoing' interface)." (RFC 6724)
1552 */
1553 if (dst_dev) {
1554 idev = __in6_dev_get(dst_dev);
1555 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1556 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1557 (idev && idev->cnf.use_oif_addrs_only)) {
1558 use_oif_addr = true;
1559 }
1560 }
1561
1562 if (use_oif_addr) {
1563 if (idev)
1564 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1565 } else {
1566 for_each_netdev_rcu(net, dev) {
1567 idev = __in6_dev_get(dev);
1568 if (!idev)
1569 continue;
1570 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1571 }
1572 }
1573 rcu_read_unlock();
1574
1575 hiscore = &scores[hiscore_idx];
1576 if (!hiscore->ifa)
1577 return -EADDRNOTAVAIL;
1578
1579 *saddr = hiscore->ifa->addr;
1580 in6_ifa_put(hiscore->ifa);
1581 return 0;
1582}
1583EXPORT_SYMBOL(ipv6_dev_get_saddr);
1584
1585int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1586 u32 banned_flags)
1587{
1588 struct inet6_ifaddr *ifp;
1589 int err = -EADDRNOTAVAIL;
1590
1591 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1592 if (ifp->scope > IFA_LINK)
1593 break;
1594 if (ifp->scope == IFA_LINK &&
1595 !(ifp->flags & banned_flags)) {
1596 *addr = ifp->addr;
1597 err = 0;
1598 break;
1599 }
1600 }
1601 return err;
1602}
1603
1604int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1605 u32 banned_flags)
1606{
1607 struct inet6_dev *idev;
1608 int err = -EADDRNOTAVAIL;
1609
1610 rcu_read_lock();
1611 idev = __in6_dev_get(dev);
1612 if (idev) {
1613 read_lock_bh(&idev->lock);
1614 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1615 read_unlock_bh(&idev->lock);
1616 }
1617 rcu_read_unlock();
1618 return err;
1619}
1620
1621static int ipv6_count_addresses(struct inet6_dev *idev)
1622{
1623 int cnt = 0;
1624 struct inet6_ifaddr *ifp;
1625
1626 read_lock_bh(&idev->lock);
1627 list_for_each_entry(ifp, &idev->addr_list, if_list)
1628 cnt++;
1629 read_unlock_bh(&idev->lock);
1630 return cnt;
1631}
1632
1633int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1634 const struct net_device *dev, int strict)
1635{
1636 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1637}
1638EXPORT_SYMBOL(ipv6_chk_addr);
1639
1640int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1641 const struct net_device *dev, int strict,
1642 u32 banned_flags)
1643{
1644 struct inet6_ifaddr *ifp;
1645 unsigned int hash = inet6_addr_hash(addr);
1646 u32 ifp_flags;
1647
1648 rcu_read_lock_bh();
1649 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1650 if (!net_eq(dev_net(ifp->idev->dev), net))
1651 continue;
1652 /* Decouple optimistic from tentative for evaluation here.
1653 * Ban optimistic addresses explicitly, when required.
1654 */
1655 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1656 ? (ifp->flags&~IFA_F_TENTATIVE)
1657 : ifp->flags;
1658 if (ipv6_addr_equal(&ifp->addr, addr) &&
1659 !(ifp_flags&banned_flags) &&
1660 (!dev || ifp->idev->dev == dev ||
1661 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1662 rcu_read_unlock_bh();
1663 return 1;
1664 }
1665 }
1666
1667 rcu_read_unlock_bh();
1668 return 0;
1669}
1670EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1671
1672static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1673 struct net_device *dev)
1674{
1675 unsigned int hash = inet6_addr_hash(addr);
1676 struct inet6_ifaddr *ifp;
1677
1678 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1679 if (!net_eq(dev_net(ifp->idev->dev), net))
1680 continue;
1681 if (ipv6_addr_equal(&ifp->addr, addr)) {
1682 if (!dev || ifp->idev->dev == dev)
1683 return true;
1684 }
1685 }
1686 return false;
1687}
1688
1689/* Compares an address/prefix_len with addresses on device @dev.
1690 * If one is found it returns true.
1691 */
1692bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1693 const unsigned int prefix_len, struct net_device *dev)
1694{
1695 struct inet6_dev *idev;
1696 struct inet6_ifaddr *ifa;
1697 bool ret = false;
1698
1699 rcu_read_lock();
1700 idev = __in6_dev_get(dev);
1701 if (idev) {
1702 read_lock_bh(&idev->lock);
1703 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1704 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1705 if (ret)
1706 break;
1707 }
1708 read_unlock_bh(&idev->lock);
1709 }
1710 rcu_read_unlock();
1711
1712 return ret;
1713}
1714EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1715
1716int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1717{
1718 struct inet6_dev *idev;
1719 struct inet6_ifaddr *ifa;
1720 int onlink;
1721
1722 onlink = 0;
1723 rcu_read_lock();
1724 idev = __in6_dev_get(dev);
1725 if (idev) {
1726 read_lock_bh(&idev->lock);
1727 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1728 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1729 ifa->prefix_len);
1730 if (onlink)
1731 break;
1732 }
1733 read_unlock_bh(&idev->lock);
1734 }
1735 rcu_read_unlock();
1736 return onlink;
1737}
1738EXPORT_SYMBOL(ipv6_chk_prefix);
1739
1740struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1741 struct net_device *dev, int strict)
1742{
1743 struct inet6_ifaddr *ifp, *result = NULL;
1744 unsigned int hash = inet6_addr_hash(addr);
1745
1746 rcu_read_lock_bh();
1747 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1748 if (!net_eq(dev_net(ifp->idev->dev), net))
1749 continue;
1750 if (ipv6_addr_equal(&ifp->addr, addr)) {
1751 if (!dev || ifp->idev->dev == dev ||
1752 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1753 result = ifp;
1754 in6_ifa_hold(ifp);
1755 break;
1756 }
1757 }
1758 }
1759 rcu_read_unlock_bh();
1760
1761 return result;
1762}
1763
1764/* Gets referenced address, destroys ifaddr */
1765
1766static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1767{
1768 if (ifp->flags&IFA_F_PERMANENT) {
1769 spin_lock_bh(&ifp->lock);
1770 addrconf_del_dad_work(ifp);
1771 ifp->flags |= IFA_F_TENTATIVE;
1772 if (dad_failed)
1773 ifp->flags |= IFA_F_DADFAILED;
1774 spin_unlock_bh(&ifp->lock);
1775 if (dad_failed)
1776 ipv6_ifa_notify(0, ifp);
1777 in6_ifa_put(ifp);
1778 } else if (ifp->flags&IFA_F_TEMPORARY) {
1779 struct inet6_ifaddr *ifpub;
1780 spin_lock_bh(&ifp->lock);
1781 ifpub = ifp->ifpub;
1782 if (ifpub) {
1783 in6_ifa_hold(ifpub);
1784 spin_unlock_bh(&ifp->lock);
1785 ipv6_create_tempaddr(ifpub, ifp);
1786 in6_ifa_put(ifpub);
1787 } else {
1788 spin_unlock_bh(&ifp->lock);
1789 }
1790 ipv6_del_addr(ifp);
1791 } else {
1792 ipv6_del_addr(ifp);
1793 }
1794}
1795
1796static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1797{
1798 int err = -ENOENT;
1799
1800 spin_lock_bh(&ifp->lock);
1801 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1802 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1803 err = 0;
1804 }
1805 spin_unlock_bh(&ifp->lock);
1806
1807 return err;
1808}
1809
1810void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1811{
1812 struct in6_addr addr;
1813 struct inet6_dev *idev = ifp->idev;
1814 struct net *net = dev_net(ifp->idev->dev);
1815
1816 if (addrconf_dad_end(ifp)) {
1817 in6_ifa_put(ifp);
1818 return;
1819 }
1820
1821 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1822 ifp->idev->dev->name, &ifp->addr);
1823
1824 spin_lock_bh(&ifp->lock);
1825
1826 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1827 int scope = ifp->scope;
1828 u32 flags = ifp->flags;
1829 struct in6_addr new_addr;
1830 struct inet6_ifaddr *ifp2;
1831 u32 valid_lft, preferred_lft;
1832 int pfxlen = ifp->prefix_len;
1833 int retries = ifp->stable_privacy_retry + 1;
1834
1835 if (retries > net->ipv6.sysctl.idgen_retries) {
1836 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1837 ifp->idev->dev->name);
1838 goto errdad;
1839 }
1840
1841 new_addr = ifp->addr;
1842 if (ipv6_generate_stable_address(&new_addr, retries,
1843 idev))
1844 goto errdad;
1845
1846 valid_lft = ifp->valid_lft;
1847 preferred_lft = ifp->prefered_lft;
1848
1849 spin_unlock_bh(&ifp->lock);
1850
1851 if (idev->cnf.max_addresses &&
1852 ipv6_count_addresses(idev) >=
1853 idev->cnf.max_addresses)
1854 goto lock_errdad;
1855
1856 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1857 ifp->idev->dev->name);
1858
1859 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1860 scope, flags, valid_lft,
1861 preferred_lft);
1862 if (IS_ERR(ifp2))
1863 goto lock_errdad;
1864
1865 spin_lock_bh(&ifp2->lock);
1866 ifp2->stable_privacy_retry = retries;
1867 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1868 spin_unlock_bh(&ifp2->lock);
1869
1870 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1871 in6_ifa_put(ifp2);
1872lock_errdad:
1873 spin_lock_bh(&ifp->lock);
1874 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1875 addr.s6_addr32[0] = htonl(0xfe800000);
1876 addr.s6_addr32[1] = 0;
1877
1878 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1879 ipv6_addr_equal(&ifp->addr, &addr)) {
1880 /* DAD failed for link-local based on MAC address */
1881 idev->cnf.disable_ipv6 = 1;
1882
1883 pr_info("%s: IPv6 being disabled!\n",
1884 ifp->idev->dev->name);
1885 }
1886 }
1887
1888errdad:
1889 /* transition from _POSTDAD to _ERRDAD */
1890 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1891 spin_unlock_bh(&ifp->lock);
1892
1893 addrconf_mod_dad_work(ifp, 0);
1894}
1895
1896/* Join to solicited addr multicast group.
1897 * caller must hold RTNL */
1898void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1899{
1900 struct in6_addr maddr;
1901
1902 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1903 return;
1904
1905 addrconf_addr_solict_mult(addr, &maddr);
1906 ipv6_dev_mc_inc(dev, &maddr);
1907}
1908
1909/* caller must hold RTNL */
1910void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1911{
1912 struct in6_addr maddr;
1913
1914 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1915 return;
1916
1917 addrconf_addr_solict_mult(addr, &maddr);
1918 __ipv6_dev_mc_dec(idev, &maddr);
1919}
1920
1921/* caller must hold RTNL */
1922static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1923{
1924 struct in6_addr addr;
1925
1926 if (ifp->prefix_len >= 127) /* RFC 6164 */
1927 return;
1928 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1929 if (ipv6_addr_any(&addr))
1930 return;
1931 __ipv6_dev_ac_inc(ifp->idev, &addr);
1932}
1933
1934/* caller must hold RTNL */
1935static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1936{
1937 struct in6_addr addr;
1938
1939 if (ifp->prefix_len >= 127) /* RFC 6164 */
1940 return;
1941 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1942 if (ipv6_addr_any(&addr))
1943 return;
1944 __ipv6_dev_ac_dec(ifp->idev, &addr);
1945}
1946
1947static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1948{
1949 if (dev->addr_len != IEEE802154_ADDR_LEN)
1950 return -1;
1951 memcpy(eui, dev->dev_addr, 8);
1952 eui[0] ^= 2;
1953 return 0;
1954}
1955
1956static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1957{
1958 union fwnet_hwaddr *ha;
1959
1960 if (dev->addr_len != FWNET_ALEN)
1961 return -1;
1962
1963 ha = (union fwnet_hwaddr *)dev->dev_addr;
1964
1965 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1966 eui[0] ^= 2;
1967 return 0;
1968}
1969
1970static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1971{
1972 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1973 if (dev->addr_len != ARCNET_ALEN)
1974 return -1;
1975 memset(eui, 0, 7);
1976 eui[7] = *(u8 *)dev->dev_addr;
1977 return 0;
1978}
1979
1980static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1981{
1982 if (dev->addr_len != INFINIBAND_ALEN)
1983 return -1;
1984 memcpy(eui, dev->dev_addr + 12, 8);
1985 eui[0] |= 2;
1986 return 0;
1987}
1988
1989static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1990{
1991 if (addr == 0)
1992 return -1;
1993 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
1994 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
1995 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
1996 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
1997 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
1998 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
1999 eui[1] = 0;
2000 eui[2] = 0x5E;
2001 eui[3] = 0xFE;
2002 memcpy(eui + 4, &addr, 4);
2003 return 0;
2004}
2005
2006static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2007{
2008 if (dev->priv_flags & IFF_ISATAP)
2009 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2010 return -1;
2011}
2012
2013static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2014{
2015 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2016}
2017
2018static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2019{
2020 memcpy(eui, dev->perm_addr, 3);
2021 memcpy(eui + 5, dev->perm_addr + 3, 3);
2022 eui[3] = 0xFF;
2023 eui[4] = 0xFE;
2024 eui[0] ^= 2;
2025 return 0;
2026}
2027
2028static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2029{
2030 switch (dev->type) {
2031 case ARPHRD_ETHER:
2032 case ARPHRD_FDDI:
2033 return addrconf_ifid_eui48(eui, dev);
2034 case ARPHRD_ARCNET:
2035 return addrconf_ifid_arcnet(eui, dev);
2036 case ARPHRD_INFINIBAND:
2037 return addrconf_ifid_infiniband(eui, dev);
2038 case ARPHRD_SIT:
2039 return addrconf_ifid_sit(eui, dev);
2040 case ARPHRD_IPGRE:
2041 return addrconf_ifid_gre(eui, dev);
2042 case ARPHRD_6LOWPAN:
2043 case ARPHRD_IEEE802154:
2044 return addrconf_ifid_eui64(eui, dev);
2045 case ARPHRD_IEEE1394:
2046 return addrconf_ifid_ieee1394(eui, dev);
2047 case ARPHRD_TUNNEL6:
2048 return addrconf_ifid_ip6tnl(eui, dev);
2049 }
2050 return -1;
2051}
2052
2053static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2054{
2055 int err = -1;
2056 struct inet6_ifaddr *ifp;
2057
2058 read_lock_bh(&idev->lock);
2059 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2060 if (ifp->scope > IFA_LINK)
2061 break;
2062 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2063 memcpy(eui, ifp->addr.s6_addr+8, 8);
2064 err = 0;
2065 break;
2066 }
2067 }
2068 read_unlock_bh(&idev->lock);
2069 return err;
2070}
2071
2072/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2073static void __ipv6_regen_rndid(struct inet6_dev *idev)
2074{
2075regen:
2076 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2077 idev->rndid[0] &= ~0x02;
2078
2079 /*
2080 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2081 * check if generated address is not inappropriate
2082 *
2083 * - Reserved subnet anycast (RFC 2526)
2084 * 11111101 11....11 1xxxxxxx
2085 * - ISATAP (RFC4214) 6.1
2086 * 00-00-5E-FE-xx-xx-xx-xx
2087 * - value 0
2088 * - XXX: already assigned to an address on the device
2089 */
2090 if (idev->rndid[0] == 0xfd &&
2091 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2092 (idev->rndid[7]&0x80))
2093 goto regen;
2094 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2095 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2096 goto regen;
2097 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2098 goto regen;
2099 }
2100}
2101
2102static void ipv6_regen_rndid(unsigned long data)
2103{
2104 struct inet6_dev *idev = (struct inet6_dev *) data;
2105 unsigned long expires;
2106
2107 rcu_read_lock_bh();
2108 write_lock_bh(&idev->lock);
2109
2110 if (idev->dead)
2111 goto out;
2112
2113 __ipv6_regen_rndid(idev);
2114
2115 expires = jiffies +
2116 idev->cnf.temp_prefered_lft * HZ -
2117 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2118 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2119 idev->cnf.max_desync_factor * HZ;
2120 if (time_before(expires, jiffies)) {
2121 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2122 __func__, idev->dev->name);
2123 goto out;
2124 }
2125
2126 if (!mod_timer(&idev->regen_timer, expires))
2127 in6_dev_hold(idev);
2128
2129out:
2130 write_unlock_bh(&idev->lock);
2131 rcu_read_unlock_bh();
2132 in6_dev_put(idev);
2133}
2134
2135static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2136{
2137 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2138 __ipv6_regen_rndid(idev);
2139}
2140
2141/*
2142 * Add prefix route.
2143 */
2144
2145static void
2146addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2147 unsigned long expires, u32 flags)
2148{
2149 struct fib6_config cfg = {
2150 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2151 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2152 .fc_ifindex = dev->ifindex,
2153 .fc_expires = expires,
2154 .fc_dst_len = plen,
2155 .fc_flags = RTF_UP | flags,
2156 .fc_nlinfo.nl_net = dev_net(dev),
2157 .fc_protocol = RTPROT_KERNEL,
2158 };
2159
2160 cfg.fc_dst = *pfx;
2161
2162 /* Prevent useless cloning on PtP SIT.
2163 This thing is done here expecting that the whole
2164 class of non-broadcast devices need not cloning.
2165 */
2166#if IS_ENABLED(CONFIG_IPV6_SIT)
2167 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2168 cfg.fc_flags |= RTF_NONEXTHOP;
2169#endif
2170
2171 ip6_route_add(&cfg);
2172}
2173
2174
2175static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2176 int plen,
2177 const struct net_device *dev,
2178 u32 flags, u32 noflags)
2179{
2180 struct fib6_node *fn;
2181 struct rt6_info *rt = NULL;
2182 struct fib6_table *table;
2183 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2184
2185 table = fib6_get_table(dev_net(dev), tb_id);
2186 if (!table)
2187 return NULL;
2188
2189 read_lock_bh(&table->tb6_lock);
2190 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2191 if (!fn)
2192 goto out;
2193
2194 noflags |= RTF_CACHE;
2195 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2196 if (rt->dst.dev->ifindex != dev->ifindex)
2197 continue;
2198 if ((rt->rt6i_flags & flags) != flags)
2199 continue;
2200 if ((rt->rt6i_flags & noflags) != 0)
2201 continue;
2202 dst_hold(&rt->dst);
2203 break;
2204 }
2205out:
2206 read_unlock_bh(&table->tb6_lock);
2207 return rt;
2208}
2209
2210
2211/* Create "default" multicast route to the interface */
2212
2213static void addrconf_add_mroute(struct net_device *dev)
2214{
2215 struct fib6_config cfg = {
2216 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2217 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2218 .fc_ifindex = dev->ifindex,
2219 .fc_dst_len = 8,
2220 .fc_flags = RTF_UP,
2221 .fc_nlinfo.nl_net = dev_net(dev),
2222 };
2223
2224 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2225
2226 ip6_route_add(&cfg);
2227}
2228
2229static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2230{
2231 struct inet6_dev *idev;
2232
2233 ASSERT_RTNL();
2234
2235 idev = ipv6_find_idev(dev);
2236 if (!idev)
2237 return ERR_PTR(-ENOBUFS);
2238
2239 if (idev->cnf.disable_ipv6)
2240 return ERR_PTR(-EACCES);
2241
2242 /* Add default multicast route */
2243 if (!(dev->flags & IFF_LOOPBACK))
2244 addrconf_add_mroute(dev);
2245
2246 return idev;
2247}
2248
2249static void manage_tempaddrs(struct inet6_dev *idev,
2250 struct inet6_ifaddr *ifp,
2251 __u32 valid_lft, __u32 prefered_lft,
2252 bool create, unsigned long now)
2253{
2254 u32 flags;
2255 struct inet6_ifaddr *ift;
2256
2257 read_lock_bh(&idev->lock);
2258 /* update all temporary addresses in the list */
2259 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2260 int age, max_valid, max_prefered;
2261
2262 if (ifp != ift->ifpub)
2263 continue;
2264
2265 /* RFC 4941 section 3.3:
2266 * If a received option will extend the lifetime of a public
2267 * address, the lifetimes of temporary addresses should
2268 * be extended, subject to the overall constraint that no
2269 * temporary addresses should ever remain "valid" or "preferred"
2270 * for a time longer than (TEMP_VALID_LIFETIME) or
2271 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2272 */
2273 age = (now - ift->cstamp) / HZ;
2274 max_valid = idev->cnf.temp_valid_lft - age;
2275 if (max_valid < 0)
2276 max_valid = 0;
2277
2278 max_prefered = idev->cnf.temp_prefered_lft -
2279 idev->cnf.max_desync_factor - age;
2280 if (max_prefered < 0)
2281 max_prefered = 0;
2282
2283 if (valid_lft > max_valid)
2284 valid_lft = max_valid;
2285
2286 if (prefered_lft > max_prefered)
2287 prefered_lft = max_prefered;
2288
2289 spin_lock(&ift->lock);
2290 flags = ift->flags;
2291 ift->valid_lft = valid_lft;
2292 ift->prefered_lft = prefered_lft;
2293 ift->tstamp = now;
2294 if (prefered_lft > 0)
2295 ift->flags &= ~IFA_F_DEPRECATED;
2296
2297 spin_unlock(&ift->lock);
2298 if (!(flags&IFA_F_TENTATIVE))
2299 ipv6_ifa_notify(0, ift);
2300 }
2301
2302 if ((create || list_empty(&idev->tempaddr_list)) &&
2303 idev->cnf.use_tempaddr > 0) {
2304 /* When a new public address is created as described
2305 * in [ADDRCONF], also create a new temporary address.
2306 * Also create a temporary address if it's enabled but
2307 * no temporary address currently exists.
2308 */
2309 read_unlock_bh(&idev->lock);
2310 ipv6_create_tempaddr(ifp, NULL);
2311 } else {
2312 read_unlock_bh(&idev->lock);
2313 }
2314}
2315
2316void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2317{
2318 struct prefix_info *pinfo;
2319 __u32 valid_lft;
2320 __u32 prefered_lft;
2321 int addr_type;
2322 u32 addr_flags = 0;
2323 struct inet6_dev *in6_dev;
2324 struct net *net = dev_net(dev);
2325
2326 pinfo = (struct prefix_info *) opt;
2327
2328 if (len < sizeof(struct prefix_info)) {
2329 ADBG("addrconf: prefix option too short\n");
2330 return;
2331 }
2332
2333 /*
2334 * Validation checks ([ADDRCONF], page 19)
2335 */
2336
2337 addr_type = ipv6_addr_type(&pinfo->prefix);
2338
2339 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2340 return;
2341
2342 valid_lft = ntohl(pinfo->valid);
2343 prefered_lft = ntohl(pinfo->prefered);
2344
2345 if (prefered_lft > valid_lft) {
2346 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2347 return;
2348 }
2349
2350 in6_dev = in6_dev_get(dev);
2351
2352 if (!in6_dev) {
2353 net_dbg_ratelimited("addrconf: device %s not configured\n",
2354 dev->name);
2355 return;
2356 }
2357
2358 /*
2359 * Two things going on here:
2360 * 1) Add routes for on-link prefixes
2361 * 2) Configure prefixes with the auto flag set
2362 */
2363
2364 if (pinfo->onlink) {
2365 struct rt6_info *rt;
2366 unsigned long rt_expires;
2367
2368 /* Avoid arithmetic overflow. Really, we could
2369 * save rt_expires in seconds, likely valid_lft,
2370 * but it would require division in fib gc, that it
2371 * not good.
2372 */
2373 if (HZ > USER_HZ)
2374 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2375 else
2376 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2377
2378 if (addrconf_finite_timeout(rt_expires))
2379 rt_expires *= HZ;
2380
2381 rt = addrconf_get_prefix_route(&pinfo->prefix,
2382 pinfo->prefix_len,
2383 dev,
2384 RTF_ADDRCONF | RTF_PREFIX_RT,
2385 RTF_GATEWAY | RTF_DEFAULT);
2386
2387 if (rt) {
2388 /* Autoconf prefix route */
2389 if (valid_lft == 0) {
2390 ip6_del_rt(rt);
2391 rt = NULL;
2392 } else if (addrconf_finite_timeout(rt_expires)) {
2393 /* not infinity */
2394 rt6_set_expires(rt, jiffies + rt_expires);
2395 } else {
2396 rt6_clean_expires(rt);
2397 }
2398 } else if (valid_lft) {
2399 clock_t expires = 0;
2400 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2401 if (addrconf_finite_timeout(rt_expires)) {
2402 /* not infinity */
2403 flags |= RTF_EXPIRES;
2404 expires = jiffies_to_clock_t(rt_expires);
2405 }
2406 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2407 dev, expires, flags);
2408 }
2409 ip6_rt_put(rt);
2410 }
2411
2412 /* Try to figure out our local address for this prefix */
2413
2414 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2415 struct inet6_ifaddr *ifp;
2416 struct in6_addr addr;
2417 int create = 0, update_lft = 0;
2418 bool tokenized = false;
2419
2420 if (pinfo->prefix_len == 64) {
2421 memcpy(&addr, &pinfo->prefix, 8);
2422
2423 if (!ipv6_addr_any(&in6_dev->token)) {
2424 read_lock_bh(&in6_dev->lock);
2425 memcpy(addr.s6_addr + 8,
2426 in6_dev->token.s6_addr + 8, 8);
2427 read_unlock_bh(&in6_dev->lock);
2428 tokenized = true;
2429 } else if (in6_dev->addr_gen_mode ==
2430 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2431 !ipv6_generate_stable_address(&addr, 0,
2432 in6_dev)) {
2433 addr_flags |= IFA_F_STABLE_PRIVACY;
2434 goto ok;
2435 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2436 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2437 in6_dev_put(in6_dev);
2438 return;
2439 }
2440 goto ok;
2441 }
2442 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2443 pinfo->prefix_len);
2444 in6_dev_put(in6_dev);
2445 return;
2446
2447ok:
2448
2449 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2450
2451 if (!ifp && valid_lft) {
2452 int max_addresses = in6_dev->cnf.max_addresses;
2453
2454#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2455 if (in6_dev->cnf.optimistic_dad &&
2456 !net->ipv6.devconf_all->forwarding && sllao)
2457 addr_flags = IFA_F_OPTIMISTIC;
2458#endif
2459
2460 /* Do not allow to create too much of autoconfigured
2461 * addresses; this would be too easy way to crash kernel.
2462 */
2463 if (!max_addresses ||
2464 ipv6_count_addresses(in6_dev) < max_addresses)
2465 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2466 pinfo->prefix_len,
2467 addr_type&IPV6_ADDR_SCOPE_MASK,
2468 addr_flags, valid_lft,
2469 prefered_lft);
2470
2471 if (IS_ERR_OR_NULL(ifp)) {
2472 in6_dev_put(in6_dev);
2473 return;
2474 }
2475
2476 update_lft = 0;
2477 create = 1;
2478 spin_lock_bh(&ifp->lock);
2479 ifp->flags |= IFA_F_MANAGETEMPADDR;
2480 ifp->cstamp = jiffies;
2481 ifp->tokenized = tokenized;
2482 spin_unlock_bh(&ifp->lock);
2483 addrconf_dad_start(ifp);
2484 }
2485
2486 if (ifp) {
2487 u32 flags;
2488 unsigned long now;
2489 u32 stored_lft;
2490
2491 /* update lifetime (RFC2462 5.5.3 e) */
2492 spin_lock_bh(&ifp->lock);
2493 now = jiffies;
2494 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2495 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2496 else
2497 stored_lft = 0;
2498 if (!update_lft && !create && stored_lft) {
2499 const u32 minimum_lft = min_t(u32,
2500 stored_lft, MIN_VALID_LIFETIME);
2501 valid_lft = max(valid_lft, minimum_lft);
2502
2503 /* RFC4862 Section 5.5.3e:
2504 * "Note that the preferred lifetime of the
2505 * corresponding address is always reset to
2506 * the Preferred Lifetime in the received
2507 * Prefix Information option, regardless of
2508 * whether the valid lifetime is also reset or
2509 * ignored."
2510 *
2511 * So we should always update prefered_lft here.
2512 */
2513 update_lft = 1;
2514 }
2515
2516 if (update_lft) {
2517 ifp->valid_lft = valid_lft;
2518 ifp->prefered_lft = prefered_lft;
2519 ifp->tstamp = now;
2520 flags = ifp->flags;
2521 ifp->flags &= ~IFA_F_DEPRECATED;
2522 spin_unlock_bh(&ifp->lock);
2523
2524 if (!(flags&IFA_F_TENTATIVE))
2525 ipv6_ifa_notify(0, ifp);
2526 } else
2527 spin_unlock_bh(&ifp->lock);
2528
2529 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2530 create, now);
2531
2532 in6_ifa_put(ifp);
2533 addrconf_verify();
2534 }
2535 }
2536 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2537 in6_dev_put(in6_dev);
2538}
2539
2540/*
2541 * Set destination address.
2542 * Special case for SIT interfaces where we create a new "virtual"
2543 * device.
2544 */
2545int addrconf_set_dstaddr(struct net *net, void __user *arg)
2546{
2547 struct in6_ifreq ireq;
2548 struct net_device *dev;
2549 int err = -EINVAL;
2550
2551 rtnl_lock();
2552
2553 err = -EFAULT;
2554 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2555 goto err_exit;
2556
2557 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2558
2559 err = -ENODEV;
2560 if (!dev)
2561 goto err_exit;
2562
2563#if IS_ENABLED(CONFIG_IPV6_SIT)
2564 if (dev->type == ARPHRD_SIT) {
2565 const struct net_device_ops *ops = dev->netdev_ops;
2566 struct ifreq ifr;
2567 struct ip_tunnel_parm p;
2568
2569 err = -EADDRNOTAVAIL;
2570 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2571 goto err_exit;
2572
2573 memset(&p, 0, sizeof(p));
2574 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2575 p.iph.saddr = 0;
2576 p.iph.version = 4;
2577 p.iph.ihl = 5;
2578 p.iph.protocol = IPPROTO_IPV6;
2579 p.iph.ttl = 64;
2580 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2581
2582 if (ops->ndo_do_ioctl) {
2583 mm_segment_t oldfs = get_fs();
2584
2585 set_fs(KERNEL_DS);
2586 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2587 set_fs(oldfs);
2588 } else
2589 err = -EOPNOTSUPP;
2590
2591 if (err == 0) {
2592 err = -ENOBUFS;
2593 dev = __dev_get_by_name(net, p.name);
2594 if (!dev)
2595 goto err_exit;
2596 err = dev_open(dev);
2597 }
2598 }
2599#endif
2600
2601err_exit:
2602 rtnl_unlock();
2603 return err;
2604}
2605
2606static int ipv6_mc_config(struct sock *sk, bool join,
2607 const struct in6_addr *addr, int ifindex)
2608{
2609 int ret;
2610
2611 ASSERT_RTNL();
2612
2613 lock_sock(sk);
2614 if (join)
2615 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2616 else
2617 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2618 release_sock(sk);
2619
2620 return ret;
2621}
2622
2623/*
2624 * Manual configuration of address on an interface
2625 */
2626static int inet6_addr_add(struct net *net, int ifindex,
2627 const struct in6_addr *pfx,
2628 const struct in6_addr *peer_pfx,
2629 unsigned int plen, __u32 ifa_flags,
2630 __u32 prefered_lft, __u32 valid_lft)
2631{
2632 struct inet6_ifaddr *ifp;
2633 struct inet6_dev *idev;
2634 struct net_device *dev;
2635 unsigned long timeout;
2636 clock_t expires;
2637 int scope;
2638 u32 flags;
2639
2640 ASSERT_RTNL();
2641
2642 if (plen > 128)
2643 return -EINVAL;
2644
2645 /* check the lifetime */
2646 if (!valid_lft || prefered_lft > valid_lft)
2647 return -EINVAL;
2648
2649 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2650 return -EINVAL;
2651
2652 dev = __dev_get_by_index(net, ifindex);
2653 if (!dev)
2654 return -ENODEV;
2655
2656 idev = addrconf_add_dev(dev);
2657 if (IS_ERR(idev))
2658 return PTR_ERR(idev);
2659
2660 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2661 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2662 true, pfx, ifindex);
2663
2664 if (ret < 0)
2665 return ret;
2666 }
2667
2668 scope = ipv6_addr_scope(pfx);
2669
2670 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2671 if (addrconf_finite_timeout(timeout)) {
2672 expires = jiffies_to_clock_t(timeout * HZ);
2673 valid_lft = timeout;
2674 flags = RTF_EXPIRES;
2675 } else {
2676 expires = 0;
2677 flags = 0;
2678 ifa_flags |= IFA_F_PERMANENT;
2679 }
2680
2681 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2682 if (addrconf_finite_timeout(timeout)) {
2683 if (timeout == 0)
2684 ifa_flags |= IFA_F_DEPRECATED;
2685 prefered_lft = timeout;
2686 }
2687
2688 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2689 valid_lft, prefered_lft);
2690
2691 if (!IS_ERR(ifp)) {
2692 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2693 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2694 expires, flags);
2695 }
2696
2697 /*
2698 * Note that section 3.1 of RFC 4429 indicates
2699 * that the Optimistic flag should not be set for
2700 * manually configured addresses
2701 */
2702 addrconf_dad_start(ifp);
2703 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2704 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2705 true, jiffies);
2706 in6_ifa_put(ifp);
2707 addrconf_verify_rtnl();
2708 return 0;
2709 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2710 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2711 false, pfx, ifindex);
2712 }
2713
2714 return PTR_ERR(ifp);
2715}
2716
2717static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2718 const struct in6_addr *pfx, unsigned int plen)
2719{
2720 struct inet6_ifaddr *ifp;
2721 struct inet6_dev *idev;
2722 struct net_device *dev;
2723
2724 if (plen > 128)
2725 return -EINVAL;
2726
2727 dev = __dev_get_by_index(net, ifindex);
2728 if (!dev)
2729 return -ENODEV;
2730
2731 idev = __in6_dev_get(dev);
2732 if (!idev)
2733 return -ENXIO;
2734
2735 read_lock_bh(&idev->lock);
2736 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2737 if (ifp->prefix_len == plen &&
2738 ipv6_addr_equal(pfx, &ifp->addr)) {
2739 in6_ifa_hold(ifp);
2740 read_unlock_bh(&idev->lock);
2741
2742 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2743 (ifa_flags & IFA_F_MANAGETEMPADDR))
2744 manage_tempaddrs(idev, ifp, 0, 0, false,
2745 jiffies);
2746 ipv6_del_addr(ifp);
2747 addrconf_verify_rtnl();
2748 if (ipv6_addr_is_multicast(pfx)) {
2749 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2750 false, pfx, dev->ifindex);
2751 }
2752 return 0;
2753 }
2754 }
2755 read_unlock_bh(&idev->lock);
2756 return -EADDRNOTAVAIL;
2757}
2758
2759
2760int addrconf_add_ifaddr(struct net *net, void __user *arg)
2761{
2762 struct in6_ifreq ireq;
2763 int err;
2764
2765 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2766 return -EPERM;
2767
2768 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2769 return -EFAULT;
2770
2771 rtnl_lock();
2772 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2773 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2774 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2775 rtnl_unlock();
2776 return err;
2777}
2778
2779int addrconf_del_ifaddr(struct net *net, void __user *arg)
2780{
2781 struct in6_ifreq ireq;
2782 int err;
2783
2784 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2785 return -EPERM;
2786
2787 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2788 return -EFAULT;
2789
2790 rtnl_lock();
2791 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2792 ireq.ifr6_prefixlen);
2793 rtnl_unlock();
2794 return err;
2795}
2796
2797static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2798 int plen, int scope)
2799{
2800 struct inet6_ifaddr *ifp;
2801
2802 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2803 scope, IFA_F_PERMANENT,
2804 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2805 if (!IS_ERR(ifp)) {
2806 spin_lock_bh(&ifp->lock);
2807 ifp->flags &= ~IFA_F_TENTATIVE;
2808 spin_unlock_bh(&ifp->lock);
2809 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2810 in6_ifa_put(ifp);
2811 }
2812}
2813
2814#if IS_ENABLED(CONFIG_IPV6_SIT)
2815static void sit_add_v4_addrs(struct inet6_dev *idev)
2816{
2817 struct in6_addr addr;
2818 struct net_device *dev;
2819 struct net *net = dev_net(idev->dev);
2820 int scope, plen;
2821 u32 pflags = 0;
2822
2823 ASSERT_RTNL();
2824
2825 memset(&addr, 0, sizeof(struct in6_addr));
2826 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2827
2828 if (idev->dev->flags&IFF_POINTOPOINT) {
2829 addr.s6_addr32[0] = htonl(0xfe800000);
2830 scope = IFA_LINK;
2831 plen = 64;
2832 } else {
2833 scope = IPV6_ADDR_COMPATv4;
2834 plen = 96;
2835 pflags |= RTF_NONEXTHOP;
2836 }
2837
2838 if (addr.s6_addr32[3]) {
2839 add_addr(idev, &addr, plen, scope);
2840 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2841 return;
2842 }
2843
2844 for_each_netdev(net, dev) {
2845 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2846 if (in_dev && (dev->flags & IFF_UP)) {
2847 struct in_ifaddr *ifa;
2848
2849 int flag = scope;
2850
2851 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2852
2853 addr.s6_addr32[3] = ifa->ifa_local;
2854
2855 if (ifa->ifa_scope == RT_SCOPE_LINK)
2856 continue;
2857 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2858 if (idev->dev->flags&IFF_POINTOPOINT)
2859 continue;
2860 flag |= IFA_HOST;
2861 }
2862
2863 add_addr(idev, &addr, plen, flag);
2864 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2865 pflags);
2866 }
2867 }
2868 }
2869}
2870#endif
2871
2872static void init_loopback(struct net_device *dev)
2873{
2874 struct inet6_dev *idev;
2875 struct net_device *sp_dev;
2876 struct inet6_ifaddr *sp_ifa;
2877 struct rt6_info *sp_rt;
2878
2879 /* ::1 */
2880
2881 ASSERT_RTNL();
2882
2883 idev = ipv6_find_idev(dev);
2884 if (!idev) {
2885 pr_debug("%s: add_dev failed\n", __func__);
2886 return;
2887 }
2888
2889 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2890
2891 /* Add routes to other interface's IPv6 addresses */
2892 for_each_netdev(dev_net(dev), sp_dev) {
2893 if (!strcmp(sp_dev->name, dev->name))
2894 continue;
2895
2896 idev = __in6_dev_get(sp_dev);
2897 if (!idev)
2898 continue;
2899
2900 read_lock_bh(&idev->lock);
2901 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2902
2903 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2904 continue;
2905
2906 if (sp_ifa->rt) {
2907 /* This dst has been added to garbage list when
2908 * lo device down, release this obsolete dst and
2909 * reallocate a new router for ifa.
2910 */
2911 if (sp_ifa->rt->dst.obsolete > 0) {
2912 ip6_rt_put(sp_ifa->rt);
2913 sp_ifa->rt = NULL;
2914 } else {
2915 continue;
2916 }
2917 }
2918
2919 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2920
2921 /* Failure cases are ignored */
2922 if (!IS_ERR(sp_rt)) {
2923 sp_ifa->rt = sp_rt;
2924 ip6_ins_rt(sp_rt);
2925 }
2926 }
2927 read_unlock_bh(&idev->lock);
2928 }
2929}
2930
2931static void addrconf_add_linklocal(struct inet6_dev *idev,
2932 const struct in6_addr *addr, u32 flags)
2933{
2934 struct inet6_ifaddr *ifp;
2935 u32 addr_flags = flags | IFA_F_PERMANENT;
2936
2937#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2938 if (idev->cnf.optimistic_dad &&
2939 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2940 addr_flags |= IFA_F_OPTIMISTIC;
2941#endif
2942
2943 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2944 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2945 if (!IS_ERR(ifp)) {
2946 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2947 addrconf_dad_start(ifp);
2948 in6_ifa_put(ifp);
2949 }
2950}
2951
2952static bool ipv6_reserved_interfaceid(struct in6_addr address)
2953{
2954 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2955 return true;
2956
2957 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2958 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2959 return true;
2960
2961 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2962 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2963 return true;
2964
2965 return false;
2966}
2967
2968static int ipv6_generate_stable_address(struct in6_addr *address,
2969 u8 dad_count,
2970 const struct inet6_dev *idev)
2971{
2972 static DEFINE_SPINLOCK(lock);
2973 static __u32 digest[SHA_DIGEST_WORDS];
2974 static __u32 workspace[SHA_WORKSPACE_WORDS];
2975
2976 static union {
2977 char __data[SHA_MESSAGE_BYTES];
2978 struct {
2979 struct in6_addr secret;
2980 __be32 prefix[2];
2981 unsigned char hwaddr[MAX_ADDR_LEN];
2982 u8 dad_count;
2983 } __packed;
2984 } data;
2985
2986 struct in6_addr secret;
2987 struct in6_addr temp;
2988 struct net *net = dev_net(idev->dev);
2989
2990 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2991
2992 if (idev->cnf.stable_secret.initialized)
2993 secret = idev->cnf.stable_secret.secret;
2994 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
2995 secret = net->ipv6.devconf_dflt->stable_secret.secret;
2996 else
2997 return -1;
2998
2999retry:
3000 spin_lock_bh(&lock);
3001
3002 sha_init(digest);
3003 memset(&data, 0, sizeof(data));
3004 memset(workspace, 0, sizeof(workspace));
3005 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3006 data.prefix[0] = address->s6_addr32[0];
3007 data.prefix[1] = address->s6_addr32[1];
3008 data.secret = secret;
3009 data.dad_count = dad_count;
3010
3011 sha_transform(digest, data.__data, workspace);
3012
3013 temp = *address;
3014 temp.s6_addr32[2] = (__force __be32)digest[0];
3015 temp.s6_addr32[3] = (__force __be32)digest[1];
3016
3017 spin_unlock_bh(&lock);
3018
3019 if (ipv6_reserved_interfaceid(temp)) {
3020 dad_count++;
3021 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3022 return -1;
3023 goto retry;
3024 }
3025
3026 *address = temp;
3027 return 0;
3028}
3029
3030static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3031{
3032 struct in6_addr addr;
3033
3034 /* no link local addresses on L3 master devices */
3035 if (netif_is_l3_master(idev->dev))
3036 return;
3037
3038 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3039
3040 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3041 if (!ipv6_generate_stable_address(&addr, 0, idev))
3042 addrconf_add_linklocal(idev, &addr,
3043 IFA_F_STABLE_PRIVACY);
3044 else if (prefix_route)
3045 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3046 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3047 /* addrconf_add_linklocal also adds a prefix_route and we
3048 * only need to care about prefix routes if ipv6_generate_eui64
3049 * couldn't generate one.
3050 */
3051 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3052 addrconf_add_linklocal(idev, &addr, 0);
3053 else if (prefix_route)
3054 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3055 }
3056}
3057
3058static void addrconf_dev_config(struct net_device *dev)
3059{
3060 struct inet6_dev *idev;
3061
3062 ASSERT_RTNL();
3063
3064 if ((dev->type != ARPHRD_ETHER) &&
3065 (dev->type != ARPHRD_FDDI) &&
3066 (dev->type != ARPHRD_ARCNET) &&
3067 (dev->type != ARPHRD_INFINIBAND) &&
3068 (dev->type != ARPHRD_IEEE802154) &&
3069 (dev->type != ARPHRD_IEEE1394) &&
3070 (dev->type != ARPHRD_TUNNEL6) &&
3071 (dev->type != ARPHRD_6LOWPAN)) {
3072 /* Alas, we support only Ethernet autoconfiguration. */
3073 return;
3074 }
3075
3076 idev = addrconf_add_dev(dev);
3077 if (IS_ERR(idev))
3078 return;
3079
3080 addrconf_addr_gen(idev, false);
3081}
3082
3083#if IS_ENABLED(CONFIG_IPV6_SIT)
3084static void addrconf_sit_config(struct net_device *dev)
3085{
3086 struct inet6_dev *idev;
3087
3088 ASSERT_RTNL();
3089
3090 /*
3091 * Configure the tunnel with one of our IPv4
3092 * addresses... we should configure all of
3093 * our v4 addrs in the tunnel
3094 */
3095
3096 idev = ipv6_find_idev(dev);
3097 if (!idev) {
3098 pr_debug("%s: add_dev failed\n", __func__);
3099 return;
3100 }
3101
3102 if (dev->priv_flags & IFF_ISATAP) {
3103 addrconf_addr_gen(idev, false);
3104 return;
3105 }
3106
3107 sit_add_v4_addrs(idev);
3108
3109 if (dev->flags&IFF_POINTOPOINT)
3110 addrconf_add_mroute(dev);
3111}
3112#endif
3113
3114#if IS_ENABLED(CONFIG_NET_IPGRE)
3115static void addrconf_gre_config(struct net_device *dev)
3116{
3117 struct inet6_dev *idev;
3118
3119 ASSERT_RTNL();
3120
3121 idev = ipv6_find_idev(dev);
3122 if (!idev) {
3123 pr_debug("%s: add_dev failed\n", __func__);
3124 return;
3125 }
3126
3127 addrconf_addr_gen(idev, true);
3128 if (dev->flags & IFF_POINTOPOINT)
3129 addrconf_add_mroute(dev);
3130}
3131#endif
3132
3133static int addrconf_notify(struct notifier_block *this, unsigned long event,
3134 void *ptr)
3135{
3136 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3137 struct inet6_dev *idev = __in6_dev_get(dev);
3138 int run_pending = 0;
3139 int err;
3140
3141 switch (event) {
3142 case NETDEV_REGISTER:
3143 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3144 idev = ipv6_add_dev(dev);
3145 if (IS_ERR(idev))
3146 return notifier_from_errno(PTR_ERR(idev));
3147 }
3148 break;
3149
3150 case NETDEV_UP:
3151 case NETDEV_CHANGE:
3152 if (dev->flags & IFF_SLAVE)
3153 break;
3154
3155 if (idev && idev->cnf.disable_ipv6)
3156 break;
3157
3158 if (event == NETDEV_UP) {
3159 if (!addrconf_qdisc_ok(dev)) {
3160 /* device is not ready yet. */
3161 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3162 dev->name);
3163 break;
3164 }
3165
3166 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3167 idev = ipv6_add_dev(dev);
3168
3169 if (!IS_ERR_OR_NULL(idev)) {
3170 idev->if_flags |= IF_READY;
3171 run_pending = 1;
3172 }
3173 } else {
3174 if (!addrconf_qdisc_ok(dev)) {
3175 /* device is still not ready. */
3176 break;
3177 }
3178
3179 if (idev) {
3180 if (idev->if_flags & IF_READY)
3181 /* device is already configured. */
3182 break;
3183 idev->if_flags |= IF_READY;
3184 }
3185
3186 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3187 dev->name);
3188
3189 run_pending = 1;
3190 }
3191
3192 switch (dev->type) {
3193#if IS_ENABLED(CONFIG_IPV6_SIT)
3194 case ARPHRD_SIT:
3195 addrconf_sit_config(dev);
3196 break;
3197#endif
3198#if IS_ENABLED(CONFIG_NET_IPGRE)
3199 case ARPHRD_IPGRE:
3200 addrconf_gre_config(dev);
3201 break;
3202#endif
3203 case ARPHRD_LOOPBACK:
3204 init_loopback(dev);
3205 break;
3206
3207 default:
3208 addrconf_dev_config(dev);
3209 break;
3210 }
3211
3212 if (!IS_ERR_OR_NULL(idev)) {
3213 if (run_pending)
3214 addrconf_dad_run(idev);
3215
3216 /*
3217 * If the MTU changed during the interface down,
3218 * when the interface up, the changed MTU must be
3219 * reflected in the idev as well as routers.
3220 */
3221 if (idev->cnf.mtu6 != dev->mtu &&
3222 dev->mtu >= IPV6_MIN_MTU) {
3223 rt6_mtu_change(dev, dev->mtu);
3224 idev->cnf.mtu6 = dev->mtu;
3225 }
3226 idev->tstamp = jiffies;
3227 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3228
3229 /*
3230 * If the changed mtu during down is lower than
3231 * IPV6_MIN_MTU stop IPv6 on this interface.
3232 */
3233 if (dev->mtu < IPV6_MIN_MTU)
3234 addrconf_ifdown(dev, 1);
3235 }
3236 break;
3237
3238 case NETDEV_CHANGEMTU:
3239 if (idev && dev->mtu >= IPV6_MIN_MTU) {
3240 rt6_mtu_change(dev, dev->mtu);
3241 idev->cnf.mtu6 = dev->mtu;
3242 break;
3243 }
3244
3245 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3246 idev = ipv6_add_dev(dev);
3247 if (!IS_ERR(idev))
3248 break;
3249 }
3250
3251 /*
3252 * if MTU under IPV6_MIN_MTU.
3253 * Stop IPv6 on this interface.
3254 */
3255
3256 case NETDEV_DOWN:
3257 case NETDEV_UNREGISTER:
3258 /*
3259 * Remove all addresses from this interface.
3260 */
3261 addrconf_ifdown(dev, event != NETDEV_DOWN);
3262 break;
3263
3264 case NETDEV_CHANGENAME:
3265 if (idev) {
3266 snmp6_unregister_dev(idev);
3267 addrconf_sysctl_unregister(idev);
3268 err = addrconf_sysctl_register(idev);
3269 if (err)
3270 return notifier_from_errno(err);
3271 err = snmp6_register_dev(idev);
3272 if (err) {
3273 addrconf_sysctl_unregister(idev);
3274 return notifier_from_errno(err);
3275 }
3276 }
3277 break;
3278
3279 case NETDEV_PRE_TYPE_CHANGE:
3280 case NETDEV_POST_TYPE_CHANGE:
3281 addrconf_type_change(dev, event);
3282 break;
3283 }
3284
3285 return NOTIFY_OK;
3286}
3287
3288/*
3289 * addrconf module should be notified of a device going up
3290 */
3291static struct notifier_block ipv6_dev_notf = {
3292 .notifier_call = addrconf_notify,
3293};
3294
3295static void addrconf_type_change(struct net_device *dev, unsigned long event)
3296{
3297 struct inet6_dev *idev;
3298 ASSERT_RTNL();
3299
3300 idev = __in6_dev_get(dev);
3301
3302 if (event == NETDEV_POST_TYPE_CHANGE)
3303 ipv6_mc_remap(idev);
3304 else if (event == NETDEV_PRE_TYPE_CHANGE)
3305 ipv6_mc_unmap(idev);
3306}
3307
3308static int addrconf_ifdown(struct net_device *dev, int how)
3309{
3310 struct net *net = dev_net(dev);
3311 struct inet6_dev *idev;
3312 struct inet6_ifaddr *ifa;
3313 int state, i;
3314
3315 ASSERT_RTNL();
3316
3317 rt6_ifdown(net, dev);
3318 neigh_ifdown(&nd_tbl, dev);
3319
3320 idev = __in6_dev_get(dev);
3321 if (!idev)
3322 return -ENODEV;
3323
3324 /*
3325 * Step 1: remove reference to ipv6 device from parent device.
3326 * Do not dev_put!
3327 */
3328 if (how) {
3329 idev->dead = 1;
3330
3331 /* protected by rtnl_lock */
3332 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3333
3334 /* Step 1.5: remove snmp6 entry */
3335 snmp6_unregister_dev(idev);
3336
3337 }
3338
3339 /* Step 2: clear hash table */
3340 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3341 struct hlist_head *h = &inet6_addr_lst[i];
3342
3343 spin_lock_bh(&addrconf_hash_lock);
3344restart:
3345 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3346 if (ifa->idev == idev) {
3347 hlist_del_init_rcu(&ifa->addr_lst);
3348 addrconf_del_dad_work(ifa);
3349 goto restart;
3350 }
3351 }
3352 spin_unlock_bh(&addrconf_hash_lock);
3353 }
3354
3355 write_lock_bh(&idev->lock);
3356
3357 addrconf_del_rs_timer(idev);
3358
3359 /* Step 2: clear flags for stateless addrconf */
3360 if (!how)
3361 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3362
3363 if (how && del_timer(&idev->regen_timer))
3364 in6_dev_put(idev);
3365
3366 /* Step 3: clear tempaddr list */
3367 while (!list_empty(&idev->tempaddr_list)) {
3368 ifa = list_first_entry(&idev->tempaddr_list,
3369 struct inet6_ifaddr, tmp_list);
3370 list_del(&ifa->tmp_list);
3371 write_unlock_bh(&idev->lock);
3372 spin_lock_bh(&ifa->lock);
3373
3374 if (ifa->ifpub) {
3375 in6_ifa_put(ifa->ifpub);
3376 ifa->ifpub = NULL;
3377 }
3378 spin_unlock_bh(&ifa->lock);
3379 in6_ifa_put(ifa);
3380 write_lock_bh(&idev->lock);
3381 }
3382
3383 while (!list_empty(&idev->addr_list)) {
3384 ifa = list_first_entry(&idev->addr_list,
3385 struct inet6_ifaddr, if_list);
3386 addrconf_del_dad_work(ifa);
3387
3388 list_del(&ifa->if_list);
3389
3390 write_unlock_bh(&idev->lock);
3391
3392 spin_lock_bh(&ifa->lock);
3393 state = ifa->state;
3394 ifa->state = INET6_IFADDR_STATE_DEAD;
3395 spin_unlock_bh(&ifa->lock);
3396
3397 if (state != INET6_IFADDR_STATE_DEAD) {
3398 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3399 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3400 }
3401 in6_ifa_put(ifa);
3402
3403 write_lock_bh(&idev->lock);
3404 }
3405
3406 write_unlock_bh(&idev->lock);
3407
3408 /* Step 5: Discard anycast and multicast list */
3409 if (how) {
3410 ipv6_ac_destroy_dev(idev);
3411 ipv6_mc_destroy_dev(idev);
3412 } else {
3413 ipv6_mc_down(idev);
3414 }
3415
3416 idev->tstamp = jiffies;
3417
3418 /* Last: Shot the device (if unregistered) */
3419 if (how) {
3420 addrconf_sysctl_unregister(idev);
3421 neigh_parms_release(&nd_tbl, idev->nd_parms);
3422 neigh_ifdown(&nd_tbl, dev);
3423 in6_dev_put(idev);
3424 }
3425 return 0;
3426}
3427
3428static void addrconf_rs_timer(unsigned long data)
3429{
3430 struct inet6_dev *idev = (struct inet6_dev *)data;
3431 struct net_device *dev = idev->dev;
3432 struct in6_addr lladdr;
3433
3434 write_lock(&idev->lock);
3435 if (idev->dead || !(idev->if_flags & IF_READY))
3436 goto out;
3437
3438 if (!ipv6_accept_ra(idev))
3439 goto out;
3440
3441 /* Announcement received after solicitation was sent */
3442 if (idev->if_flags & IF_RA_RCVD)
3443 goto out;
3444
3445 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3446 write_unlock(&idev->lock);
3447 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3448 ndisc_send_rs(dev, &lladdr,
3449 &in6addr_linklocal_allrouters);
3450 else
3451 goto put;
3452
3453 write_lock(&idev->lock);
3454 /* The wait after the last probe can be shorter */
3455 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3456 idev->cnf.rtr_solicits) ?
3457 idev->cnf.rtr_solicit_delay :
3458 idev->cnf.rtr_solicit_interval);
3459 } else {
3460 /*
3461 * Note: we do not support deprecated "all on-link"
3462 * assumption any longer.
3463 */
3464 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3465 }
3466
3467out:
3468 write_unlock(&idev->lock);
3469put:
3470 in6_dev_put(idev);
3471}
3472
3473/*
3474 * Duplicate Address Detection
3475 */
3476static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3477{
3478 unsigned long rand_num;
3479 struct inet6_dev *idev = ifp->idev;
3480
3481 if (ifp->flags & IFA_F_OPTIMISTIC)
3482 rand_num = 0;
3483 else
3484 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3485
3486 ifp->dad_probes = idev->cnf.dad_transmits;
3487 addrconf_mod_dad_work(ifp, rand_num);
3488}
3489
3490static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3491{
3492 struct inet6_dev *idev = ifp->idev;
3493 struct net_device *dev = idev->dev;
3494
3495 addrconf_join_solict(dev, &ifp->addr);
3496
3497 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3498
3499 read_lock_bh(&idev->lock);
3500 spin_lock(&ifp->lock);
3501 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3502 goto out;
3503
3504 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3505 idev->cnf.accept_dad < 1 ||
3506 !(ifp->flags&IFA_F_TENTATIVE) ||
3507 ifp->flags & IFA_F_NODAD) {
3508 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3509 spin_unlock(&ifp->lock);
3510 read_unlock_bh(&idev->lock);
3511
3512 addrconf_dad_completed(ifp);
3513 return;
3514 }
3515
3516 if (!(idev->if_flags & IF_READY)) {
3517 spin_unlock(&ifp->lock);
3518 read_unlock_bh(&idev->lock);
3519 /*
3520 * If the device is not ready:
3521 * - keep it tentative if it is a permanent address.
3522 * - otherwise, kill it.
3523 */
3524 in6_ifa_hold(ifp);
3525 addrconf_dad_stop(ifp, 0);
3526 return;
3527 }
3528
3529 /*
3530 * Optimistic nodes can start receiving
3531 * Frames right away
3532 */
3533 if (ifp->flags & IFA_F_OPTIMISTIC) {
3534 ip6_ins_rt(ifp->rt);
3535 if (ipv6_use_optimistic_addr(idev)) {
3536 /* Because optimistic nodes can use this address,
3537 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3538 */
3539 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3540 }
3541 }
3542
3543 addrconf_dad_kick(ifp);
3544out:
3545 spin_unlock(&ifp->lock);
3546 read_unlock_bh(&idev->lock);
3547}
3548
3549static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3550{
3551 bool begin_dad = false;
3552
3553 spin_lock_bh(&ifp->lock);
3554 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3555 ifp->state = INET6_IFADDR_STATE_PREDAD;
3556 begin_dad = true;
3557 }
3558 spin_unlock_bh(&ifp->lock);
3559
3560 if (begin_dad)
3561 addrconf_mod_dad_work(ifp, 0);
3562}
3563
3564static void addrconf_dad_work(struct work_struct *w)
3565{
3566 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3567 struct inet6_ifaddr,
3568 dad_work);
3569 struct inet6_dev *idev = ifp->idev;
3570 struct in6_addr mcaddr;
3571
3572 enum {
3573 DAD_PROCESS,
3574 DAD_BEGIN,
3575 DAD_ABORT,
3576 } action = DAD_PROCESS;
3577
3578 rtnl_lock();
3579
3580 spin_lock_bh(&ifp->lock);
3581 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3582 action = DAD_BEGIN;
3583 ifp->state = INET6_IFADDR_STATE_DAD;
3584 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3585 action = DAD_ABORT;
3586 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3587 }
3588 spin_unlock_bh(&ifp->lock);
3589
3590 if (action == DAD_BEGIN) {
3591 addrconf_dad_begin(ifp);
3592 goto out;
3593 } else if (action == DAD_ABORT) {
3594 addrconf_dad_stop(ifp, 1);
3595 goto out;
3596 }
3597
3598 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3599 goto out;
3600
3601 write_lock_bh(&idev->lock);
3602 if (idev->dead || !(idev->if_flags & IF_READY)) {
3603 write_unlock_bh(&idev->lock);
3604 goto out;
3605 }
3606
3607 spin_lock(&ifp->lock);
3608 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3609 spin_unlock(&ifp->lock);
3610 write_unlock_bh(&idev->lock);
3611 goto out;
3612 }
3613
3614 if (ifp->dad_probes == 0) {
3615 /*
3616 * DAD was successful
3617 */
3618
3619 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3620 spin_unlock(&ifp->lock);
3621 write_unlock_bh(&idev->lock);
3622
3623 addrconf_dad_completed(ifp);
3624
3625 goto out;
3626 }
3627
3628 ifp->dad_probes--;
3629 addrconf_mod_dad_work(ifp,
3630 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3631 spin_unlock(&ifp->lock);
3632 write_unlock_bh(&idev->lock);
3633
3634 /* send a neighbour solicitation for our addr */
3635 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3636 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any, NULL);
3637out:
3638 in6_ifa_put(ifp);
3639 rtnl_unlock();
3640}
3641
3642/* ifp->idev must be at least read locked */
3643static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3644{
3645 struct inet6_ifaddr *ifpiter;
3646 struct inet6_dev *idev = ifp->idev;
3647
3648 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3649 if (ifpiter->scope > IFA_LINK)
3650 break;
3651 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3652 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3653 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3654 IFA_F_PERMANENT)
3655 return false;
3656 }
3657 return true;
3658}
3659
3660static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3661{
3662 struct net_device *dev = ifp->idev->dev;
3663 struct in6_addr lladdr;
3664 bool send_rs, send_mld;
3665
3666 addrconf_del_dad_work(ifp);
3667
3668 /*
3669 * Configure the address for reception. Now it is valid.
3670 */
3671
3672 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3673
3674 /* If added prefix is link local and we are prepared to process
3675 router advertisements, start sending router solicitations.
3676 */
3677
3678 read_lock_bh(&ifp->idev->lock);
3679 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3680 send_rs = send_mld &&
3681 ipv6_accept_ra(ifp->idev) &&
3682 ifp->idev->cnf.rtr_solicits > 0 &&
3683 (dev->flags&IFF_LOOPBACK) == 0;
3684 read_unlock_bh(&ifp->idev->lock);
3685
3686 /* While dad is in progress mld report's source address is in6_addrany.
3687 * Resend with proper ll now.
3688 */
3689 if (send_mld)
3690 ipv6_mc_dad_complete(ifp->idev);
3691
3692 if (send_rs) {
3693 /*
3694 * If a host as already performed a random delay
3695 * [...] as part of DAD [...] there is no need
3696 * to delay again before sending the first RS
3697 */
3698 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3699 return;
3700 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3701
3702 write_lock_bh(&ifp->idev->lock);
3703 spin_lock(&ifp->lock);
3704 ifp->idev->rs_probes = 1;
3705 ifp->idev->if_flags |= IF_RS_SENT;
3706 addrconf_mod_rs_timer(ifp->idev,
3707 ifp->idev->cnf.rtr_solicit_interval);
3708 spin_unlock(&ifp->lock);
3709 write_unlock_bh(&ifp->idev->lock);
3710 }
3711}
3712
3713static void addrconf_dad_run(struct inet6_dev *idev)
3714{
3715 struct inet6_ifaddr *ifp;
3716
3717 read_lock_bh(&idev->lock);
3718 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3719 spin_lock(&ifp->lock);
3720 if (ifp->flags & IFA_F_TENTATIVE &&
3721 ifp->state == INET6_IFADDR_STATE_DAD)
3722 addrconf_dad_kick(ifp);
3723 spin_unlock(&ifp->lock);
3724 }
3725 read_unlock_bh(&idev->lock);
3726}
3727
3728#ifdef CONFIG_PROC_FS
3729struct if6_iter_state {
3730 struct seq_net_private p;
3731 int bucket;
3732 int offset;
3733};
3734
3735static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3736{
3737 struct inet6_ifaddr *ifa = NULL;
3738 struct if6_iter_state *state = seq->private;
3739 struct net *net = seq_file_net(seq);
3740 int p = 0;
3741
3742 /* initial bucket if pos is 0 */
3743 if (pos == 0) {
3744 state->bucket = 0;
3745 state->offset = 0;
3746 }
3747
3748 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3749 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3750 addr_lst) {
3751 if (!net_eq(dev_net(ifa->idev->dev), net))
3752 continue;
3753 /* sync with offset */
3754 if (p < state->offset) {
3755 p++;
3756 continue;
3757 }
3758 state->offset++;
3759 return ifa;
3760 }
3761
3762 /* prepare for next bucket */
3763 state->offset = 0;
3764 p = 0;
3765 }
3766 return NULL;
3767}
3768
3769static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3770 struct inet6_ifaddr *ifa)
3771{
3772 struct if6_iter_state *state = seq->private;
3773 struct net *net = seq_file_net(seq);
3774
3775 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3776 if (!net_eq(dev_net(ifa->idev->dev), net))
3777 continue;
3778 state->offset++;
3779 return ifa;
3780 }
3781
3782 while (++state->bucket < IN6_ADDR_HSIZE) {
3783 state->offset = 0;
3784 hlist_for_each_entry_rcu_bh(ifa,
3785 &inet6_addr_lst[state->bucket], addr_lst) {
3786 if (!net_eq(dev_net(ifa->idev->dev), net))
3787 continue;
3788 state->offset++;
3789 return ifa;
3790 }
3791 }
3792
3793 return NULL;
3794}
3795
3796static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3797 __acquires(rcu_bh)
3798{
3799 rcu_read_lock_bh();
3800 return if6_get_first(seq, *pos);
3801}
3802
3803static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3804{
3805 struct inet6_ifaddr *ifa;
3806
3807 ifa = if6_get_next(seq, v);
3808 ++*pos;
3809 return ifa;
3810}
3811
3812static void if6_seq_stop(struct seq_file *seq, void *v)
3813 __releases(rcu_bh)
3814{
3815 rcu_read_unlock_bh();
3816}
3817
3818static int if6_seq_show(struct seq_file *seq, void *v)
3819{
3820 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3821 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3822 &ifp->addr,
3823 ifp->idev->dev->ifindex,
3824 ifp->prefix_len,
3825 ifp->scope,
3826 (u8) ifp->flags,
3827 ifp->idev->dev->name);
3828 return 0;
3829}
3830
3831static const struct seq_operations if6_seq_ops = {
3832 .start = if6_seq_start,
3833 .next = if6_seq_next,
3834 .show = if6_seq_show,
3835 .stop = if6_seq_stop,
3836};
3837
3838static int if6_seq_open(struct inode *inode, struct file *file)
3839{
3840 return seq_open_net(inode, file, &if6_seq_ops,
3841 sizeof(struct if6_iter_state));
3842}
3843
3844static const struct file_operations if6_fops = {
3845 .owner = THIS_MODULE,
3846 .open = if6_seq_open,
3847 .read = seq_read,
3848 .llseek = seq_lseek,
3849 .release = seq_release_net,
3850};
3851
3852static int __net_init if6_proc_net_init(struct net *net)
3853{
3854 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3855 return -ENOMEM;
3856 return 0;
3857}
3858
3859static void __net_exit if6_proc_net_exit(struct net *net)
3860{
3861 remove_proc_entry("if_inet6", net->proc_net);
3862}
3863
3864static struct pernet_operations if6_proc_net_ops = {
3865 .init = if6_proc_net_init,
3866 .exit = if6_proc_net_exit,
3867};
3868
3869int __init if6_proc_init(void)
3870{
3871 return register_pernet_subsys(&if6_proc_net_ops);
3872}
3873
3874void if6_proc_exit(void)
3875{
3876 unregister_pernet_subsys(&if6_proc_net_ops);
3877}
3878#endif /* CONFIG_PROC_FS */
3879
3880#if IS_ENABLED(CONFIG_IPV6_MIP6)
3881/* Check if address is a home address configured on any interface. */
3882int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3883{
3884 int ret = 0;
3885 struct inet6_ifaddr *ifp = NULL;
3886 unsigned int hash = inet6_addr_hash(addr);
3887
3888 rcu_read_lock_bh();
3889 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3890 if (!net_eq(dev_net(ifp->idev->dev), net))
3891 continue;
3892 if (ipv6_addr_equal(&ifp->addr, addr) &&
3893 (ifp->flags & IFA_F_HOMEADDRESS)) {
3894 ret = 1;
3895 break;
3896 }
3897 }
3898 rcu_read_unlock_bh();
3899 return ret;
3900}
3901#endif
3902
3903/*
3904 * Periodic address status verification
3905 */
3906
3907static void addrconf_verify_rtnl(void)
3908{
3909 unsigned long now, next, next_sec, next_sched;
3910 struct inet6_ifaddr *ifp;
3911 int i;
3912
3913 ASSERT_RTNL();
3914
3915 rcu_read_lock_bh();
3916 now = jiffies;
3917 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3918
3919 cancel_delayed_work(&addr_chk_work);
3920
3921 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3922restart:
3923 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3924 unsigned long age;
3925
3926 /* When setting preferred_lft to a value not zero or
3927 * infinity, while valid_lft is infinity
3928 * IFA_F_PERMANENT has a non-infinity life time.
3929 */
3930 if ((ifp->flags & IFA_F_PERMANENT) &&
3931 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3932 continue;
3933
3934 spin_lock(&ifp->lock);
3935 /* We try to batch several events at once. */
3936 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3937
3938 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3939 age >= ifp->valid_lft) {
3940 spin_unlock(&ifp->lock);
3941 in6_ifa_hold(ifp);
3942 ipv6_del_addr(ifp);
3943 goto restart;
3944 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3945 spin_unlock(&ifp->lock);
3946 continue;
3947 } else if (age >= ifp->prefered_lft) {
3948 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3949 int deprecate = 0;
3950
3951 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3952 deprecate = 1;
3953 ifp->flags |= IFA_F_DEPRECATED;
3954 }
3955
3956 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3957 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3958 next = ifp->tstamp + ifp->valid_lft * HZ;
3959
3960 spin_unlock(&ifp->lock);
3961
3962 if (deprecate) {
3963 in6_ifa_hold(ifp);
3964
3965 ipv6_ifa_notify(0, ifp);
3966 in6_ifa_put(ifp);
3967 goto restart;
3968 }
3969 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3970 !(ifp->flags&IFA_F_TENTATIVE)) {
3971 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3972 ifp->idev->cnf.dad_transmits *
3973 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3974
3975 if (age >= ifp->prefered_lft - regen_advance) {
3976 struct inet6_ifaddr *ifpub = ifp->ifpub;
3977 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3978 next = ifp->tstamp + ifp->prefered_lft * HZ;
3979 if (!ifp->regen_count && ifpub) {
3980 ifp->regen_count++;
3981 in6_ifa_hold(ifp);
3982 in6_ifa_hold(ifpub);
3983 spin_unlock(&ifp->lock);
3984
3985 spin_lock(&ifpub->lock);
3986 ifpub->regen_count = 0;
3987 spin_unlock(&ifpub->lock);
3988 ipv6_create_tempaddr(ifpub, ifp);
3989 in6_ifa_put(ifpub);
3990 in6_ifa_put(ifp);
3991 goto restart;
3992 }
3993 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
3994 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
3995 spin_unlock(&ifp->lock);
3996 } else {
3997 /* ifp->prefered_lft <= ifp->valid_lft */
3998 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3999 next = ifp->tstamp + ifp->prefered_lft * HZ;
4000 spin_unlock(&ifp->lock);
4001 }
4002 }
4003 }
4004
4005 next_sec = round_jiffies_up(next);
4006 next_sched = next;
4007
4008 /* If rounded timeout is accurate enough, accept it. */
4009 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4010 next_sched = next_sec;
4011
4012 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4013 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4014 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4015
4016 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4017 now, next, next_sec, next_sched);
4018 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4019 rcu_read_unlock_bh();
4020}
4021
4022static void addrconf_verify_work(struct work_struct *w)
4023{
4024 rtnl_lock();
4025 addrconf_verify_rtnl();
4026 rtnl_unlock();
4027}
4028
4029static void addrconf_verify(void)
4030{
4031 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4032}
4033
4034static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4035 struct in6_addr **peer_pfx)
4036{
4037 struct in6_addr *pfx = NULL;
4038
4039 *peer_pfx = NULL;
4040
4041 if (addr)
4042 pfx = nla_data(addr);
4043
4044 if (local) {
4045 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4046 *peer_pfx = pfx;
4047 pfx = nla_data(local);
4048 }
4049
4050 return pfx;
4051}
4052
4053static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4054 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4055 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4056 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4057 [IFA_FLAGS] = { .len = sizeof(u32) },
4058};
4059
4060static int
4061inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4062{
4063 struct net *net = sock_net(skb->sk);
4064 struct ifaddrmsg *ifm;
4065 struct nlattr *tb[IFA_MAX+1];
4066 struct in6_addr *pfx, *peer_pfx;
4067 u32 ifa_flags;
4068 int err;
4069
4070 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4071 if (err < 0)
4072 return err;
4073
4074 ifm = nlmsg_data(nlh);
4075 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4076 if (!pfx)
4077 return -EINVAL;
4078
4079 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4080
4081 /* We ignore other flags so far. */
4082 ifa_flags &= IFA_F_MANAGETEMPADDR;
4083
4084 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4085 ifm->ifa_prefixlen);
4086}
4087
4088static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4089 u32 prefered_lft, u32 valid_lft)
4090{
4091 u32 flags;
4092 clock_t expires;
4093 unsigned long timeout;
4094 bool was_managetempaddr;
4095 bool had_prefixroute;
4096
4097 ASSERT_RTNL();
4098
4099 if (!valid_lft || (prefered_lft > valid_lft))
4100 return -EINVAL;
4101
4102 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4103 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4104 return -EINVAL;
4105
4106 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4107 if (addrconf_finite_timeout(timeout)) {
4108 expires = jiffies_to_clock_t(timeout * HZ);
4109 valid_lft = timeout;
4110 flags = RTF_EXPIRES;
4111 } else {
4112 expires = 0;
4113 flags = 0;
4114 ifa_flags |= IFA_F_PERMANENT;
4115 }
4116
4117 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4118 if (addrconf_finite_timeout(timeout)) {
4119 if (timeout == 0)
4120 ifa_flags |= IFA_F_DEPRECATED;
4121 prefered_lft = timeout;
4122 }
4123
4124 spin_lock_bh(&ifp->lock);
4125 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4126 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4127 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4128 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4129 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4130 IFA_F_NOPREFIXROUTE);
4131 ifp->flags |= ifa_flags;
4132 ifp->tstamp = jiffies;
4133 ifp->valid_lft = valid_lft;
4134 ifp->prefered_lft = prefered_lft;
4135
4136 spin_unlock_bh(&ifp->lock);
4137 if (!(ifp->flags&IFA_F_TENTATIVE))
4138 ipv6_ifa_notify(0, ifp);
4139
4140 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4141 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4142 expires, flags);
4143 } else if (had_prefixroute) {
4144 enum cleanup_prefix_rt_t action;
4145 unsigned long rt_expires;
4146
4147 write_lock_bh(&ifp->idev->lock);
4148 action = check_cleanup_prefix_route(ifp, &rt_expires);
4149 write_unlock_bh(&ifp->idev->lock);
4150
4151 if (action != CLEANUP_PREFIX_RT_NOP) {
4152 cleanup_prefix_route(ifp, rt_expires,
4153 action == CLEANUP_PREFIX_RT_DEL);
4154 }
4155 }
4156
4157 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4158 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4159 valid_lft = prefered_lft = 0;
4160 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4161 !was_managetempaddr, jiffies);
4162 }
4163
4164 addrconf_verify_rtnl();
4165
4166 return 0;
4167}
4168
4169static int
4170inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4171{
4172 struct net *net = sock_net(skb->sk);
4173 struct ifaddrmsg *ifm;
4174 struct nlattr *tb[IFA_MAX+1];
4175 struct in6_addr *pfx, *peer_pfx;
4176 struct inet6_ifaddr *ifa;
4177 struct net_device *dev;
4178 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4179 u32 ifa_flags;
4180 int err;
4181
4182 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4183 if (err < 0)
4184 return err;
4185
4186 ifm = nlmsg_data(nlh);
4187 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4188 if (!pfx)
4189 return -EINVAL;
4190
4191 if (tb[IFA_CACHEINFO]) {
4192 struct ifa_cacheinfo *ci;
4193
4194 ci = nla_data(tb[IFA_CACHEINFO]);
4195 valid_lft = ci->ifa_valid;
4196 preferred_lft = ci->ifa_prefered;
4197 } else {
4198 preferred_lft = INFINITY_LIFE_TIME;
4199 valid_lft = INFINITY_LIFE_TIME;
4200 }
4201
4202 dev = __dev_get_by_index(net, ifm->ifa_index);
4203 if (!dev)
4204 return -ENODEV;
4205
4206 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4207
4208 /* We ignore other flags so far. */
4209 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4210 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4211
4212 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4213 if (!ifa) {
4214 /*
4215 * It would be best to check for !NLM_F_CREATE here but
4216 * userspace already relies on not having to provide this.
4217 */
4218 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4219 ifm->ifa_prefixlen, ifa_flags,
4220 preferred_lft, valid_lft);
4221 }
4222
4223 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4224 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4225 err = -EEXIST;
4226 else
4227 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4228
4229 in6_ifa_put(ifa);
4230
4231 return err;
4232}
4233
4234static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4235 u8 scope, int ifindex)
4236{
4237 struct ifaddrmsg *ifm;
4238
4239 ifm = nlmsg_data(nlh);
4240 ifm->ifa_family = AF_INET6;
4241 ifm->ifa_prefixlen = prefixlen;
4242 ifm->ifa_flags = flags;
4243 ifm->ifa_scope = scope;
4244 ifm->ifa_index = ifindex;
4245}
4246
4247static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4248 unsigned long tstamp, u32 preferred, u32 valid)
4249{
4250 struct ifa_cacheinfo ci;
4251
4252 ci.cstamp = cstamp_delta(cstamp);
4253 ci.tstamp = cstamp_delta(tstamp);
4254 ci.ifa_prefered = preferred;
4255 ci.ifa_valid = valid;
4256
4257 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4258}
4259
4260static inline int rt_scope(int ifa_scope)
4261{
4262 if (ifa_scope & IFA_HOST)
4263 return RT_SCOPE_HOST;
4264 else if (ifa_scope & IFA_LINK)
4265 return RT_SCOPE_LINK;
4266 else if (ifa_scope & IFA_SITE)
4267 return RT_SCOPE_SITE;
4268 else
4269 return RT_SCOPE_UNIVERSE;
4270}
4271
4272static inline int inet6_ifaddr_msgsize(void)
4273{
4274 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4275 + nla_total_size(16) /* IFA_LOCAL */
4276 + nla_total_size(16) /* IFA_ADDRESS */
4277 + nla_total_size(sizeof(struct ifa_cacheinfo))
4278 + nla_total_size(4) /* IFA_FLAGS */;
4279}
4280
4281static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4282 u32 portid, u32 seq, int event, unsigned int flags)
4283{
4284 struct nlmsghdr *nlh;
4285 u32 preferred, valid;
4286
4287 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4288 if (!nlh)
4289 return -EMSGSIZE;
4290
4291 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4292 ifa->idev->dev->ifindex);
4293
4294 if (!((ifa->flags&IFA_F_PERMANENT) &&
4295 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4296 preferred = ifa->prefered_lft;
4297 valid = ifa->valid_lft;
4298 if (preferred != INFINITY_LIFE_TIME) {
4299 long tval = (jiffies - ifa->tstamp)/HZ;
4300 if (preferred > tval)
4301 preferred -= tval;
4302 else
4303 preferred = 0;
4304 if (valid != INFINITY_LIFE_TIME) {
4305 if (valid > tval)
4306 valid -= tval;
4307 else
4308 valid = 0;
4309 }
4310 }
4311 } else {
4312 preferred = INFINITY_LIFE_TIME;
4313 valid = INFINITY_LIFE_TIME;
4314 }
4315
4316 if (!ipv6_addr_any(&ifa->peer_addr)) {
4317 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4318 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4319 goto error;
4320 } else
4321 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4322 goto error;
4323
4324 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4325 goto error;
4326
4327 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4328 goto error;
4329
4330 nlmsg_end(skb, nlh);
4331 return 0;
4332
4333error:
4334 nlmsg_cancel(skb, nlh);
4335 return -EMSGSIZE;
4336}
4337
4338static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4339 u32 portid, u32 seq, int event, u16 flags)
4340{
4341 struct nlmsghdr *nlh;
4342 u8 scope = RT_SCOPE_UNIVERSE;
4343 int ifindex = ifmca->idev->dev->ifindex;
4344
4345 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4346 scope = RT_SCOPE_SITE;
4347
4348 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4349 if (!nlh)
4350 return -EMSGSIZE;
4351
4352 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4353 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4354 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4355 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4356 nlmsg_cancel(skb, nlh);
4357 return -EMSGSIZE;
4358 }
4359
4360 nlmsg_end(skb, nlh);
4361 return 0;
4362}
4363
4364static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4365 u32 portid, u32 seq, int event, unsigned int flags)
4366{
4367 struct nlmsghdr *nlh;
4368 u8 scope = RT_SCOPE_UNIVERSE;
4369 int ifindex = ifaca->aca_idev->dev->ifindex;
4370
4371 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4372 scope = RT_SCOPE_SITE;
4373
4374 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4375 if (!nlh)
4376 return -EMSGSIZE;
4377
4378 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4379 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4380 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4381 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4382 nlmsg_cancel(skb, nlh);
4383 return -EMSGSIZE;
4384 }
4385
4386 nlmsg_end(skb, nlh);
4387 return 0;
4388}
4389
4390enum addr_type_t {
4391 UNICAST_ADDR,
4392 MULTICAST_ADDR,
4393 ANYCAST_ADDR,
4394};
4395
4396/* called with rcu_read_lock() */
4397static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4398 struct netlink_callback *cb, enum addr_type_t type,
4399 int s_ip_idx, int *p_ip_idx)
4400{
4401 struct ifmcaddr6 *ifmca;
4402 struct ifacaddr6 *ifaca;
4403 int err = 1;
4404 int ip_idx = *p_ip_idx;
4405
4406 read_lock_bh(&idev->lock);
4407 switch (type) {
4408 case UNICAST_ADDR: {
4409 struct inet6_ifaddr *ifa;
4410
4411 /* unicast address incl. temp addr */
4412 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4413 if (++ip_idx < s_ip_idx)
4414 continue;
4415 err = inet6_fill_ifaddr(skb, ifa,
4416 NETLINK_CB(cb->skb).portid,
4417 cb->nlh->nlmsg_seq,
4418 RTM_NEWADDR,
4419 NLM_F_MULTI);
4420 if (err < 0)
4421 break;
4422 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4423 }
4424 break;
4425 }
4426 case MULTICAST_ADDR:
4427 /* multicast address */
4428 for (ifmca = idev->mc_list; ifmca;
4429 ifmca = ifmca->next, ip_idx++) {
4430 if (ip_idx < s_ip_idx)
4431 continue;
4432 err = inet6_fill_ifmcaddr(skb, ifmca,
4433 NETLINK_CB(cb->skb).portid,
4434 cb->nlh->nlmsg_seq,
4435 RTM_GETMULTICAST,
4436 NLM_F_MULTI);
4437 if (err < 0)
4438 break;
4439 }
4440 break;
4441 case ANYCAST_ADDR:
4442 /* anycast address */
4443 for (ifaca = idev->ac_list; ifaca;
4444 ifaca = ifaca->aca_next, ip_idx++) {
4445 if (ip_idx < s_ip_idx)
4446 continue;
4447 err = inet6_fill_ifacaddr(skb, ifaca,
4448 NETLINK_CB(cb->skb).portid,
4449 cb->nlh->nlmsg_seq,
4450 RTM_GETANYCAST,
4451 NLM_F_MULTI);
4452 if (err < 0)
4453 break;
4454 }
4455 break;
4456 default:
4457 break;
4458 }
4459 read_unlock_bh(&idev->lock);
4460 *p_ip_idx = ip_idx;
4461 return err;
4462}
4463
4464static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4465 enum addr_type_t type)
4466{
4467 struct net *net = sock_net(skb->sk);
4468 int h, s_h;
4469 int idx, ip_idx;
4470 int s_idx, s_ip_idx;
4471 struct net_device *dev;
4472 struct inet6_dev *idev;
4473 struct hlist_head *head;
4474
4475 s_h = cb->args[0];
4476 s_idx = idx = cb->args[1];
4477 s_ip_idx = ip_idx = cb->args[2];
4478
4479 rcu_read_lock();
4480 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4481 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4482 idx = 0;
4483 head = &net->dev_index_head[h];
4484 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4485 if (idx < s_idx)
4486 goto cont;
4487 if (h > s_h || idx > s_idx)
4488 s_ip_idx = 0;
4489 ip_idx = 0;
4490 idev = __in6_dev_get(dev);
4491 if (!idev)
4492 goto cont;
4493
4494 if (in6_dump_addrs(idev, skb, cb, type,
4495 s_ip_idx, &ip_idx) < 0)
4496 goto done;
4497cont:
4498 idx++;
4499 }
4500 }
4501done:
4502 rcu_read_unlock();
4503 cb->args[0] = h;
4504 cb->args[1] = idx;
4505 cb->args[2] = ip_idx;
4506
4507 return skb->len;
4508}
4509
4510static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4511{
4512 enum addr_type_t type = UNICAST_ADDR;
4513
4514 return inet6_dump_addr(skb, cb, type);
4515}
4516
4517static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4518{
4519 enum addr_type_t type = MULTICAST_ADDR;
4520
4521 return inet6_dump_addr(skb, cb, type);
4522}
4523
4524
4525static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4526{
4527 enum addr_type_t type = ANYCAST_ADDR;
4528
4529 return inet6_dump_addr(skb, cb, type);
4530}
4531
4532static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4533{
4534 struct net *net = sock_net(in_skb->sk);
4535 struct ifaddrmsg *ifm;
4536 struct nlattr *tb[IFA_MAX+1];
4537 struct in6_addr *addr = NULL, *peer;
4538 struct net_device *dev = NULL;
4539 struct inet6_ifaddr *ifa;
4540 struct sk_buff *skb;
4541 int err;
4542
4543 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4544 if (err < 0)
4545 goto errout;
4546
4547 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4548 if (!addr) {
4549 err = -EINVAL;
4550 goto errout;
4551 }
4552
4553 ifm = nlmsg_data(nlh);
4554 if (ifm->ifa_index)
4555 dev = __dev_get_by_index(net, ifm->ifa_index);
4556
4557 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4558 if (!ifa) {
4559 err = -EADDRNOTAVAIL;
4560 goto errout;
4561 }
4562
4563 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4564 if (!skb) {
4565 err = -ENOBUFS;
4566 goto errout_ifa;
4567 }
4568
4569 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4570 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4571 if (err < 0) {
4572 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4573 WARN_ON(err == -EMSGSIZE);
4574 kfree_skb(skb);
4575 goto errout_ifa;
4576 }
4577 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4578errout_ifa:
4579 in6_ifa_put(ifa);
4580errout:
4581 return err;
4582}
4583
4584static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4585{
4586 struct sk_buff *skb;
4587 struct net *net = dev_net(ifa->idev->dev);
4588 int err = -ENOBUFS;
4589
4590 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4591 if (!skb)
4592 goto errout;
4593
4594 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4595 if (err < 0) {
4596 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4597 WARN_ON(err == -EMSGSIZE);
4598 kfree_skb(skb);
4599 goto errout;
4600 }
4601 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4602 return;
4603errout:
4604 if (err < 0)
4605 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4606}
4607
4608static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4609 __s32 *array, int bytes)
4610{
4611 BUG_ON(bytes < (DEVCONF_MAX * 4));
4612
4613 memset(array, 0, bytes);
4614 array[DEVCONF_FORWARDING] = cnf->forwarding;
4615 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4616 array[DEVCONF_MTU6] = cnf->mtu6;
4617 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4618 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4619 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4620 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4621 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4622 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4623 jiffies_to_msecs(cnf->rtr_solicit_interval);
4624 array[DEVCONF_RTR_SOLICIT_DELAY] =
4625 jiffies_to_msecs(cnf->rtr_solicit_delay);
4626 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4627 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4628 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4629 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4630 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4631 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4632 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4633 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4634 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4635 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4636 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4637 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4638 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4639 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4640#ifdef CONFIG_IPV6_ROUTER_PREF
4641 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4642 array[DEVCONF_RTR_PROBE_INTERVAL] =
4643 jiffies_to_msecs(cnf->rtr_probe_interval);
4644#ifdef CONFIG_IPV6_ROUTE_INFO
4645 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4646#endif
4647#endif
4648 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4649 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4650#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4651 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4652 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4653#endif
4654#ifdef CONFIG_IPV6_MROUTE
4655 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4656#endif
4657 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4658 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4659 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4660 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4661 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4662 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4663 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4664 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4665 /* we omit DEVCONF_STABLE_SECRET for now */
4666 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4667}
4668
4669static inline size_t inet6_ifla6_size(void)
4670{
4671 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4672 + nla_total_size(sizeof(struct ifla_cacheinfo))
4673 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4674 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4675 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4676 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4677}
4678
4679static inline size_t inet6_if_nlmsg_size(void)
4680{
4681 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4682 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4683 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4684 + nla_total_size(4) /* IFLA_MTU */
4685 + nla_total_size(4) /* IFLA_LINK */
4686 + nla_total_size(1) /* IFLA_OPERSTATE */
4687 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4688}
4689
4690static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4691 int items, int bytes)
4692{
4693 int i;
4694 int pad = bytes - sizeof(u64) * items;
4695 BUG_ON(pad < 0);
4696
4697 /* Use put_unaligned() because stats may not be aligned for u64. */
4698 put_unaligned(items, &stats[0]);
4699 for (i = 1; i < items; i++)
4700 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4701
4702 memset(&stats[items], 0, pad);
4703}
4704
4705static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4706 int bytes, size_t syncpoff)
4707{
4708 int i, c;
4709 u64 buff[IPSTATS_MIB_MAX];
4710 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4711
4712 BUG_ON(pad < 0);
4713
4714 memset(buff, 0, sizeof(buff));
4715 buff[0] = IPSTATS_MIB_MAX;
4716
4717 for_each_possible_cpu(c) {
4718 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4719 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4720 }
4721
4722 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4723 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4724}
4725
4726static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4727 int bytes)
4728{
4729 switch (attrtype) {
4730 case IFLA_INET6_STATS:
4731 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4732 offsetof(struct ipstats_mib, syncp));
4733 break;
4734 case IFLA_INET6_ICMP6STATS:
4735 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4736 break;
4737 }
4738}
4739
4740static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4741 u32 ext_filter_mask)
4742{
4743 struct nlattr *nla;
4744 struct ifla_cacheinfo ci;
4745
4746 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4747 goto nla_put_failure;
4748 ci.max_reasm_len = IPV6_MAXPLEN;
4749 ci.tstamp = cstamp_delta(idev->tstamp);
4750 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4751 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4752 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4753 goto nla_put_failure;
4754 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4755 if (!nla)
4756 goto nla_put_failure;
4757 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4758
4759 /* XXX - MC not implemented */
4760
4761 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4762 return 0;
4763
4764 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4765 if (!nla)
4766 goto nla_put_failure;
4767 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4768
4769 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4770 if (!nla)
4771 goto nla_put_failure;
4772 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4773
4774 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4775 if (!nla)
4776 goto nla_put_failure;
4777
4778 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4779 goto nla_put_failure;
4780
4781 read_lock_bh(&idev->lock);
4782 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4783 read_unlock_bh(&idev->lock);
4784
4785 return 0;
4786
4787nla_put_failure:
4788 return -EMSGSIZE;
4789}
4790
4791static size_t inet6_get_link_af_size(const struct net_device *dev,
4792 u32 ext_filter_mask)
4793{
4794 if (!__in6_dev_get(dev))
4795 return 0;
4796
4797 return inet6_ifla6_size();
4798}
4799
4800static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4801 u32 ext_filter_mask)
4802{
4803 struct inet6_dev *idev = __in6_dev_get(dev);
4804
4805 if (!idev)
4806 return -ENODATA;
4807
4808 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4809 return -EMSGSIZE;
4810
4811 return 0;
4812}
4813
4814static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4815{
4816 struct inet6_ifaddr *ifp;
4817 struct net_device *dev = idev->dev;
4818 bool update_rs = false;
4819 struct in6_addr ll_addr;
4820
4821 ASSERT_RTNL();
4822
4823 if (!token)
4824 return -EINVAL;
4825 if (ipv6_addr_any(token))
4826 return -EINVAL;
4827 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4828 return -EINVAL;
4829 if (!ipv6_accept_ra(idev))
4830 return -EINVAL;
4831 if (idev->cnf.rtr_solicits <= 0)
4832 return -EINVAL;
4833
4834 write_lock_bh(&idev->lock);
4835
4836 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4837 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4838
4839 write_unlock_bh(&idev->lock);
4840
4841 if (!idev->dead && (idev->if_flags & IF_READY) &&
4842 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4843 IFA_F_OPTIMISTIC)) {
4844
4845 /* If we're not ready, then normal ifup will take care
4846 * of this. Otherwise, we need to request our rs here.
4847 */
4848 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4849 update_rs = true;
4850 }
4851
4852 write_lock_bh(&idev->lock);
4853
4854 if (update_rs) {
4855 idev->if_flags |= IF_RS_SENT;
4856 idev->rs_probes = 1;
4857 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4858 }
4859
4860 /* Well, that's kinda nasty ... */
4861 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4862 spin_lock(&ifp->lock);
4863 if (ifp->tokenized) {
4864 ifp->valid_lft = 0;
4865 ifp->prefered_lft = 0;
4866 }
4867 spin_unlock(&ifp->lock);
4868 }
4869
4870 write_unlock_bh(&idev->lock);
4871 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4872 addrconf_verify_rtnl();
4873 return 0;
4874}
4875
4876static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4877 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4878 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4879};
4880
4881static int inet6_validate_link_af(const struct net_device *dev,
4882 const struct nlattr *nla)
4883{
4884 struct nlattr *tb[IFLA_INET6_MAX + 1];
4885
4886 if (dev && !__in6_dev_get(dev))
4887 return -EAFNOSUPPORT;
4888
4889 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4890}
4891
4892static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4893{
4894 int err = -EINVAL;
4895 struct inet6_dev *idev = __in6_dev_get(dev);
4896 struct nlattr *tb[IFLA_INET6_MAX + 1];
4897
4898 if (!idev)
4899 return -EAFNOSUPPORT;
4900
4901 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4902 BUG();
4903
4904 if (tb[IFLA_INET6_TOKEN]) {
4905 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4906 if (err)
4907 return err;
4908 }
4909
4910 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4911 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4912
4913 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4914 mode != IN6_ADDR_GEN_MODE_NONE &&
4915 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4916 return -EINVAL;
4917
4918 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4919 !idev->cnf.stable_secret.initialized &&
4920 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4921 return -EINVAL;
4922
4923 idev->addr_gen_mode = mode;
4924 err = 0;
4925 }
4926
4927 return err;
4928}
4929
4930static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4931 u32 portid, u32 seq, int event, unsigned int flags)
4932{
4933 struct net_device *dev = idev->dev;
4934 struct ifinfomsg *hdr;
4935 struct nlmsghdr *nlh;
4936 void *protoinfo;
4937
4938 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4939 if (!nlh)
4940 return -EMSGSIZE;
4941
4942 hdr = nlmsg_data(nlh);
4943 hdr->ifi_family = AF_INET6;
4944 hdr->__ifi_pad = 0;
4945 hdr->ifi_type = dev->type;
4946 hdr->ifi_index = dev->ifindex;
4947 hdr->ifi_flags = dev_get_flags(dev);
4948 hdr->ifi_change = 0;
4949
4950 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4951 (dev->addr_len &&
4952 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4953 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4954 (dev->ifindex != dev_get_iflink(dev) &&
4955 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
4956 nla_put_u8(skb, IFLA_OPERSTATE,
4957 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
4958 goto nla_put_failure;
4959 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4960 if (!protoinfo)
4961 goto nla_put_failure;
4962
4963 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
4964 goto nla_put_failure;
4965
4966 nla_nest_end(skb, protoinfo);
4967 nlmsg_end(skb, nlh);
4968 return 0;
4969
4970nla_put_failure:
4971 nlmsg_cancel(skb, nlh);
4972 return -EMSGSIZE;
4973}
4974
4975static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4976{
4977 struct net *net = sock_net(skb->sk);
4978 int h, s_h;
4979 int idx = 0, s_idx;
4980 struct net_device *dev;
4981 struct inet6_dev *idev;
4982 struct hlist_head *head;
4983
4984 s_h = cb->args[0];
4985 s_idx = cb->args[1];
4986
4987 rcu_read_lock();
4988 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4989 idx = 0;
4990 head = &net->dev_index_head[h];
4991 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4992 if (idx < s_idx)
4993 goto cont;
4994 idev = __in6_dev_get(dev);
4995 if (!idev)
4996 goto cont;
4997 if (inet6_fill_ifinfo(skb, idev,
4998 NETLINK_CB(cb->skb).portid,
4999 cb->nlh->nlmsg_seq,
5000 RTM_NEWLINK, NLM_F_MULTI) < 0)
5001 goto out;
5002cont:
5003 idx++;
5004 }
5005 }
5006out:
5007 rcu_read_unlock();
5008 cb->args[1] = idx;
5009 cb->args[0] = h;
5010
5011 return skb->len;
5012}
5013
5014void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5015{
5016 struct sk_buff *skb;
5017 struct net *net = dev_net(idev->dev);
5018 int err = -ENOBUFS;
5019
5020 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5021 if (!skb)
5022 goto errout;
5023
5024 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5025 if (err < 0) {
5026 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5027 WARN_ON(err == -EMSGSIZE);
5028 kfree_skb(skb);
5029 goto errout;
5030 }
5031 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5032 return;
5033errout:
5034 if (err < 0)
5035 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5036}
5037
5038static inline size_t inet6_prefix_nlmsg_size(void)
5039{
5040 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5041 + nla_total_size(sizeof(struct in6_addr))
5042 + nla_total_size(sizeof(struct prefix_cacheinfo));
5043}
5044
5045static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5046 struct prefix_info *pinfo, u32 portid, u32 seq,
5047 int event, unsigned int flags)
5048{
5049 struct prefixmsg *pmsg;
5050 struct nlmsghdr *nlh;
5051 struct prefix_cacheinfo ci;
5052
5053 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5054 if (!nlh)
5055 return -EMSGSIZE;
5056
5057 pmsg = nlmsg_data(nlh);
5058 pmsg->prefix_family = AF_INET6;
5059 pmsg->prefix_pad1 = 0;
5060 pmsg->prefix_pad2 = 0;
5061 pmsg->prefix_ifindex = idev->dev->ifindex;
5062 pmsg->prefix_len = pinfo->prefix_len;
5063 pmsg->prefix_type = pinfo->type;
5064 pmsg->prefix_pad3 = 0;
5065 pmsg->prefix_flags = 0;
5066 if (pinfo->onlink)
5067 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5068 if (pinfo->autoconf)
5069 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5070
5071 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5072 goto nla_put_failure;
5073 ci.preferred_time = ntohl(pinfo->prefered);
5074 ci.valid_time = ntohl(pinfo->valid);
5075 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5076 goto nla_put_failure;
5077 nlmsg_end(skb, nlh);
5078 return 0;
5079
5080nla_put_failure:
5081 nlmsg_cancel(skb, nlh);
5082 return -EMSGSIZE;
5083}
5084
5085static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5086 struct prefix_info *pinfo)
5087{
5088 struct sk_buff *skb;
5089 struct net *net = dev_net(idev->dev);
5090 int err = -ENOBUFS;
5091
5092 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5093 if (!skb)
5094 goto errout;
5095
5096 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5097 if (err < 0) {
5098 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5099 WARN_ON(err == -EMSGSIZE);
5100 kfree_skb(skb);
5101 goto errout;
5102 }
5103 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5104 return;
5105errout:
5106 if (err < 0)
5107 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5108}
5109
5110static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5111{
5112 struct net *net = dev_net(ifp->idev->dev);
5113
5114 if (event)
5115 ASSERT_RTNL();
5116
5117 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5118
5119 switch (event) {
5120 case RTM_NEWADDR:
5121 /*
5122 * If the address was optimistic
5123 * we inserted the route at the start of
5124 * our DAD process, so we don't need
5125 * to do it again
5126 */
5127 if (!(ifp->rt->rt6i_node))
5128 ip6_ins_rt(ifp->rt);
5129 if (ifp->idev->cnf.forwarding)
5130 addrconf_join_anycast(ifp);
5131 if (!ipv6_addr_any(&ifp->peer_addr))
5132 addrconf_prefix_route(&ifp->peer_addr, 128,
5133 ifp->idev->dev, 0, 0);
5134 break;
5135 case RTM_DELADDR:
5136 if (ifp->idev->cnf.forwarding)
5137 addrconf_leave_anycast(ifp);
5138 addrconf_leave_solict(ifp->idev, &ifp->addr);
5139 if (!ipv6_addr_any(&ifp->peer_addr)) {
5140 struct rt6_info *rt;
5141
5142 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5143 ifp->idev->dev, 0, 0);
5144 if (rt)
5145 ip6_del_rt(rt);
5146 }
5147 dst_hold(&ifp->rt->dst);
5148
5149 ip6_del_rt(ifp->rt);
5150
5151 rt_genid_bump_ipv6(net);
5152 break;
5153 }
5154 atomic_inc(&net->ipv6.dev_addr_genid);
5155}
5156
5157static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5158{
5159 rcu_read_lock_bh();
5160 if (likely(ifp->idev->dead == 0))
5161 __ipv6_ifa_notify(event, ifp);
5162 rcu_read_unlock_bh();
5163}
5164
5165#ifdef CONFIG_SYSCTL
5166
5167static
5168int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5169 void __user *buffer, size_t *lenp, loff_t *ppos)
5170{
5171 int *valp = ctl->data;
5172 int val = *valp;
5173 loff_t pos = *ppos;
5174 struct ctl_table lctl;
5175 int ret;
5176
5177 /*
5178 * ctl->data points to idev->cnf.forwarding, we should
5179 * not modify it until we get the rtnl lock.
5180 */
5181 lctl = *ctl;
5182 lctl.data = &val;
5183
5184 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5185
5186 if (write)
5187 ret = addrconf_fixup_forwarding(ctl, valp, val);
5188 if (ret)
5189 *ppos = pos;
5190 return ret;
5191}
5192
5193static
5194int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5195 void __user *buffer, size_t *lenp, loff_t *ppos)
5196{
5197 struct inet6_dev *idev = ctl->extra1;
5198 int min_mtu = IPV6_MIN_MTU;
5199 struct ctl_table lctl;
5200
5201 lctl = *ctl;
5202 lctl.extra1 = &min_mtu;
5203 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5204
5205 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5206}
5207
5208static void dev_disable_change(struct inet6_dev *idev)
5209{
5210 struct netdev_notifier_info info;
5211
5212 if (!idev || !idev->dev)
5213 return;
5214
5215 netdev_notifier_info_init(&info, idev->dev);
5216 if (idev->cnf.disable_ipv6)
5217 addrconf_notify(NULL, NETDEV_DOWN, &info);
5218 else
5219 addrconf_notify(NULL, NETDEV_UP, &info);
5220}
5221
5222static void addrconf_disable_change(struct net *net, __s32 newf)
5223{
5224 struct net_device *dev;
5225 struct inet6_dev *idev;
5226
5227 rcu_read_lock();
5228 for_each_netdev_rcu(net, dev) {
5229 idev = __in6_dev_get(dev);
5230 if (idev) {
5231 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5232 idev->cnf.disable_ipv6 = newf;
5233 if (changed)
5234 dev_disable_change(idev);
5235 }
5236 }
5237 rcu_read_unlock();
5238}
5239
5240static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5241{
5242 struct net *net;
5243 int old;
5244
5245 if (!rtnl_trylock())
5246 return restart_syscall();
5247
5248 net = (struct net *)table->extra2;
5249 old = *p;
5250 *p = newf;
5251
5252 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5253 rtnl_unlock();
5254 return 0;
5255 }
5256
5257 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5258 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5259 addrconf_disable_change(net, newf);
5260 } else if ((!newf) ^ (!old))
5261 dev_disable_change((struct inet6_dev *)table->extra1);
5262
5263 rtnl_unlock();
5264 return 0;
5265}
5266
5267static
5268int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5269 void __user *buffer, size_t *lenp, loff_t *ppos)
5270{
5271 int *valp = ctl->data;
5272 int val = *valp;
5273 loff_t pos = *ppos;
5274 struct ctl_table lctl;
5275 int ret;
5276
5277 /*
5278 * ctl->data points to idev->cnf.disable_ipv6, we should
5279 * not modify it until we get the rtnl lock.
5280 */
5281 lctl = *ctl;
5282 lctl.data = &val;
5283
5284 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5285
5286 if (write)
5287 ret = addrconf_disable_ipv6(ctl, valp, val);
5288 if (ret)
5289 *ppos = pos;
5290 return ret;
5291}
5292
5293static
5294int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5295 void __user *buffer, size_t *lenp, loff_t *ppos)
5296{
5297 int *valp = ctl->data;
5298 int ret;
5299 int old, new;
5300
5301 old = *valp;
5302 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5303 new = *valp;
5304
5305 if (write && old != new) {
5306 struct net *net = ctl->extra2;
5307
5308 if (!rtnl_trylock())
5309 return restart_syscall();
5310
5311 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5312 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5313 NETCONFA_IFINDEX_DEFAULT,
5314 net->ipv6.devconf_dflt);
5315 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5316 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5317 NETCONFA_IFINDEX_ALL,
5318 net->ipv6.devconf_all);
5319 else {
5320 struct inet6_dev *idev = ctl->extra1;
5321
5322 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5323 idev->dev->ifindex,
5324 &idev->cnf);
5325 }
5326 rtnl_unlock();
5327 }
5328
5329 return ret;
5330}
5331
5332static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5333 void __user *buffer, size_t *lenp,
5334 loff_t *ppos)
5335{
5336 int err;
5337 struct in6_addr addr;
5338 char str[IPV6_MAX_STRLEN];
5339 struct ctl_table lctl = *ctl;
5340 struct net *net = ctl->extra2;
5341 struct ipv6_stable_secret *secret = ctl->data;
5342
5343 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5344 return -EIO;
5345
5346 lctl.maxlen = IPV6_MAX_STRLEN;
5347 lctl.data = str;
5348
5349 if (!rtnl_trylock())
5350 return restart_syscall();
5351
5352 if (!write && !secret->initialized) {
5353 err = -EIO;
5354 goto out;
5355 }
5356
5357 if (!write) {
5358 err = snprintf(str, sizeof(str), "%pI6",
5359 &secret->secret);
5360 if (err >= sizeof(str)) {
5361 err = -EIO;
5362 goto out;
5363 }
5364 }
5365
5366 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5367 if (err || !write)
5368 goto out;
5369
5370 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5371 err = -EIO;
5372 goto out;
5373 }
5374
5375 secret->initialized = true;
5376 secret->secret = addr;
5377
5378 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5379 struct net_device *dev;
5380
5381 for_each_netdev(net, dev) {
5382 struct inet6_dev *idev = __in6_dev_get(dev);
5383
5384 if (idev) {
5385 idev->addr_gen_mode =
5386 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5387 }
5388 }
5389 } else {
5390 struct inet6_dev *idev = ctl->extra1;
5391
5392 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5393 }
5394
5395out:
5396 rtnl_unlock();
5397
5398 return err;
5399}
5400
5401static
5402int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5403 int write,
5404 void __user *buffer,
5405 size_t *lenp,
5406 loff_t *ppos)
5407{
5408 int *valp = ctl->data;
5409 int val = *valp;
5410 loff_t pos = *ppos;
5411 struct ctl_table lctl;
5412 int ret;
5413
5414 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5415 * we should not modify it until we get the rtnl lock.
5416 */
5417 lctl = *ctl;
5418 lctl.data = &val;
5419
5420 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5421
5422 if (write)
5423 ret = addrconf_fixup_linkdown(ctl, valp, val);
5424 if (ret)
5425 *ppos = pos;
5426 return ret;
5427}
5428
5429static struct addrconf_sysctl_table
5430{
5431 struct ctl_table_header *sysctl_header;
5432 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5433} addrconf_sysctl __read_mostly = {
5434 .sysctl_header = NULL,
5435 .addrconf_vars = {
5436 {
5437 .procname = "forwarding",
5438 .data = &ipv6_devconf.forwarding,
5439 .maxlen = sizeof(int),
5440 .mode = 0644,
5441 .proc_handler = addrconf_sysctl_forward,
5442 },
5443 {
5444 .procname = "hop_limit",
5445 .data = &ipv6_devconf.hop_limit,
5446 .maxlen = sizeof(int),
5447 .mode = 0644,
5448 .proc_handler = proc_dointvec,
5449 },
5450 {
5451 .procname = "mtu",
5452 .data = &ipv6_devconf.mtu6,
5453 .maxlen = sizeof(int),
5454 .mode = 0644,
5455 .proc_handler = addrconf_sysctl_mtu,
5456 },
5457 {
5458 .procname = "accept_ra",
5459 .data = &ipv6_devconf.accept_ra,
5460 .maxlen = sizeof(int),
5461 .mode = 0644,
5462 .proc_handler = proc_dointvec,
5463 },
5464 {
5465 .procname = "accept_redirects",
5466 .data = &ipv6_devconf.accept_redirects,
5467 .maxlen = sizeof(int),
5468 .mode = 0644,
5469 .proc_handler = proc_dointvec,
5470 },
5471 {
5472 .procname = "autoconf",
5473 .data = &ipv6_devconf.autoconf,
5474 .maxlen = sizeof(int),
5475 .mode = 0644,
5476 .proc_handler = proc_dointvec,
5477 },
5478 {
5479 .procname = "dad_transmits",
5480 .data = &ipv6_devconf.dad_transmits,
5481 .maxlen = sizeof(int),
5482 .mode = 0644,
5483 .proc_handler = proc_dointvec,
5484 },
5485 {
5486 .procname = "router_solicitations",
5487 .data = &ipv6_devconf.rtr_solicits,
5488 .maxlen = sizeof(int),
5489 .mode = 0644,
5490 .proc_handler = proc_dointvec,
5491 },
5492 {
5493 .procname = "router_solicitation_interval",
5494 .data = &ipv6_devconf.rtr_solicit_interval,
5495 .maxlen = sizeof(int),
5496 .mode = 0644,
5497 .proc_handler = proc_dointvec_jiffies,
5498 },
5499 {
5500 .procname = "router_solicitation_delay",
5501 .data = &ipv6_devconf.rtr_solicit_delay,
5502 .maxlen = sizeof(int),
5503 .mode = 0644,
5504 .proc_handler = proc_dointvec_jiffies,
5505 },
5506 {
5507 .procname = "force_mld_version",
5508 .data = &ipv6_devconf.force_mld_version,
5509 .maxlen = sizeof(int),
5510 .mode = 0644,
5511 .proc_handler = proc_dointvec,
5512 },
5513 {
5514 .procname = "mldv1_unsolicited_report_interval",
5515 .data =
5516 &ipv6_devconf.mldv1_unsolicited_report_interval,
5517 .maxlen = sizeof(int),
5518 .mode = 0644,
5519 .proc_handler = proc_dointvec_ms_jiffies,
5520 },
5521 {
5522 .procname = "mldv2_unsolicited_report_interval",
5523 .data =
5524 &ipv6_devconf.mldv2_unsolicited_report_interval,
5525 .maxlen = sizeof(int),
5526 .mode = 0644,
5527 .proc_handler = proc_dointvec_ms_jiffies,
5528 },
5529 {
5530 .procname = "use_tempaddr",
5531 .data = &ipv6_devconf.use_tempaddr,
5532 .maxlen = sizeof(int),
5533 .mode = 0644,
5534 .proc_handler = proc_dointvec,
5535 },
5536 {
5537 .procname = "temp_valid_lft",
5538 .data = &ipv6_devconf.temp_valid_lft,
5539 .maxlen = sizeof(int),
5540 .mode = 0644,
5541 .proc_handler = proc_dointvec,
5542 },
5543 {
5544 .procname = "temp_prefered_lft",
5545 .data = &ipv6_devconf.temp_prefered_lft,
5546 .maxlen = sizeof(int),
5547 .mode = 0644,
5548 .proc_handler = proc_dointvec,
5549 },
5550 {
5551 .procname = "regen_max_retry",
5552 .data = &ipv6_devconf.regen_max_retry,
5553 .maxlen = sizeof(int),
5554 .mode = 0644,
5555 .proc_handler = proc_dointvec,
5556 },
5557 {
5558 .procname = "max_desync_factor",
5559 .data = &ipv6_devconf.max_desync_factor,
5560 .maxlen = sizeof(int),
5561 .mode = 0644,
5562 .proc_handler = proc_dointvec,
5563 },
5564 {
5565 .procname = "max_addresses",
5566 .data = &ipv6_devconf.max_addresses,
5567 .maxlen = sizeof(int),
5568 .mode = 0644,
5569 .proc_handler = proc_dointvec,
5570 },
5571 {
5572 .procname = "accept_ra_defrtr",
5573 .data = &ipv6_devconf.accept_ra_defrtr,
5574 .maxlen = sizeof(int),
5575 .mode = 0644,
5576 .proc_handler = proc_dointvec,
5577 },
5578 {
5579 .procname = "accept_ra_min_hop_limit",
5580 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5581 .maxlen = sizeof(int),
5582 .mode = 0644,
5583 .proc_handler = proc_dointvec,
5584 },
5585 {
5586 .procname = "accept_ra_pinfo",
5587 .data = &ipv6_devconf.accept_ra_pinfo,
5588 .maxlen = sizeof(int),
5589 .mode = 0644,
5590 .proc_handler = proc_dointvec,
5591 },
5592#ifdef CONFIG_IPV6_ROUTER_PREF
5593 {
5594 .procname = "accept_ra_rtr_pref",
5595 .data = &ipv6_devconf.accept_ra_rtr_pref,
5596 .maxlen = sizeof(int),
5597 .mode = 0644,
5598 .proc_handler = proc_dointvec,
5599 },
5600 {
5601 .procname = "router_probe_interval",
5602 .data = &ipv6_devconf.rtr_probe_interval,
5603 .maxlen = sizeof(int),
5604 .mode = 0644,
5605 .proc_handler = proc_dointvec_jiffies,
5606 },
5607#ifdef CONFIG_IPV6_ROUTE_INFO
5608 {
5609 .procname = "accept_ra_rt_info_max_plen",
5610 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5611 .maxlen = sizeof(int),
5612 .mode = 0644,
5613 .proc_handler = proc_dointvec,
5614 },
5615#endif
5616#endif
5617 {
5618 .procname = "proxy_ndp",
5619 .data = &ipv6_devconf.proxy_ndp,
5620 .maxlen = sizeof(int),
5621 .mode = 0644,
5622 .proc_handler = addrconf_sysctl_proxy_ndp,
5623 },
5624 {
5625 .procname = "accept_source_route",
5626 .data = &ipv6_devconf.accept_source_route,
5627 .maxlen = sizeof(int),
5628 .mode = 0644,
5629 .proc_handler = proc_dointvec,
5630 },
5631#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5632 {
5633 .procname = "optimistic_dad",
5634 .data = &ipv6_devconf.optimistic_dad,
5635 .maxlen = sizeof(int),
5636 .mode = 0644,
5637 .proc_handler = proc_dointvec,
5638
5639 },
5640 {
5641 .procname = "use_optimistic",
5642 .data = &ipv6_devconf.use_optimistic,
5643 .maxlen = sizeof(int),
5644 .mode = 0644,
5645 .proc_handler = proc_dointvec,
5646
5647 },
5648#endif
5649#ifdef CONFIG_IPV6_MROUTE
5650 {
5651 .procname = "mc_forwarding",
5652 .data = &ipv6_devconf.mc_forwarding,
5653 .maxlen = sizeof(int),
5654 .mode = 0444,
5655 .proc_handler = proc_dointvec,
5656 },
5657#endif
5658 {
5659 .procname = "disable_ipv6",
5660 .data = &ipv6_devconf.disable_ipv6,
5661 .maxlen = sizeof(int),
5662 .mode = 0644,
5663 .proc_handler = addrconf_sysctl_disable,
5664 },
5665 {
5666 .procname = "accept_dad",
5667 .data = &ipv6_devconf.accept_dad,
5668 .maxlen = sizeof(int),
5669 .mode = 0644,
5670 .proc_handler = proc_dointvec,
5671 },
5672 {
5673 .procname = "force_tllao",
5674 .data = &ipv6_devconf.force_tllao,
5675 .maxlen = sizeof(int),
5676 .mode = 0644,
5677 .proc_handler = proc_dointvec
5678 },
5679 {
5680 .procname = "ndisc_notify",
5681 .data = &ipv6_devconf.ndisc_notify,
5682 .maxlen = sizeof(int),
5683 .mode = 0644,
5684 .proc_handler = proc_dointvec
5685 },
5686 {
5687 .procname = "suppress_frag_ndisc",
5688 .data = &ipv6_devconf.suppress_frag_ndisc,
5689 .maxlen = sizeof(int),
5690 .mode = 0644,
5691 .proc_handler = proc_dointvec
5692 },
5693 {
5694 .procname = "accept_ra_from_local",
5695 .data = &ipv6_devconf.accept_ra_from_local,
5696 .maxlen = sizeof(int),
5697 .mode = 0644,
5698 .proc_handler = proc_dointvec,
5699 },
5700 {
5701 .procname = "accept_ra_mtu",
5702 .data = &ipv6_devconf.accept_ra_mtu,
5703 .maxlen = sizeof(int),
5704 .mode = 0644,
5705 .proc_handler = proc_dointvec,
5706 },
5707 {
5708 .procname = "stable_secret",
5709 .data = &ipv6_devconf.stable_secret,
5710 .maxlen = IPV6_MAX_STRLEN,
5711 .mode = 0600,
5712 .proc_handler = addrconf_sysctl_stable_secret,
5713 },
5714 {
5715 .procname = "use_oif_addrs_only",
5716 .data = &ipv6_devconf.use_oif_addrs_only,
5717 .maxlen = sizeof(int),
5718 .mode = 0644,
5719 .proc_handler = proc_dointvec,
5720 },
5721 {
5722 .procname = "ignore_routes_with_linkdown",
5723 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5724 .maxlen = sizeof(int),
5725 .mode = 0644,
5726 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5727 },
5728 {
5729 /* sentinel */
5730 }
5731 },
5732};
5733
5734static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5735 struct inet6_dev *idev, struct ipv6_devconf *p)
5736{
5737 int i;
5738 struct addrconf_sysctl_table *t;
5739 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5740
5741 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5742 if (!t)
5743 goto out;
5744
5745 for (i = 0; t->addrconf_vars[i].data; i++) {
5746 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5747 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5748 t->addrconf_vars[i].extra2 = net;
5749 }
5750
5751 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5752
5753 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5754 if (!t->sysctl_header)
5755 goto free;
5756
5757 p->sysctl = t;
5758 return 0;
5759
5760free:
5761 kfree(t);
5762out:
5763 return -ENOBUFS;
5764}
5765
5766static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5767{
5768 struct addrconf_sysctl_table *t;
5769
5770 if (!p->sysctl)
5771 return;
5772
5773 t = p->sysctl;
5774 p->sysctl = NULL;
5775 unregister_net_sysctl_table(t->sysctl_header);
5776 kfree(t);
5777}
5778
5779static int addrconf_sysctl_register(struct inet6_dev *idev)
5780{
5781 int err;
5782
5783 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5784 return -EINVAL;
5785
5786 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5787 &ndisc_ifinfo_sysctl_change);
5788 if (err)
5789 return err;
5790 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5791 idev, &idev->cnf);
5792 if (err)
5793 neigh_sysctl_unregister(idev->nd_parms);
5794
5795 return err;
5796}
5797
5798static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5799{
5800 __addrconf_sysctl_unregister(&idev->cnf);
5801 neigh_sysctl_unregister(idev->nd_parms);
5802}
5803
5804
5805#endif
5806
5807static int __net_init addrconf_init_net(struct net *net)
5808{
5809 int err = -ENOMEM;
5810 struct ipv6_devconf *all, *dflt;
5811
5812 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5813 if (!all)
5814 goto err_alloc_all;
5815
5816 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5817 if (!dflt)
5818 goto err_alloc_dflt;
5819
5820 /* these will be inherited by all namespaces */
5821 dflt->autoconf = ipv6_defaults.autoconf;
5822 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5823
5824 dflt->stable_secret.initialized = false;
5825 all->stable_secret.initialized = false;
5826
5827 net->ipv6.devconf_all = all;
5828 net->ipv6.devconf_dflt = dflt;
5829
5830#ifdef CONFIG_SYSCTL
5831 err = __addrconf_sysctl_register(net, "all", NULL, all);
5832 if (err < 0)
5833 goto err_reg_all;
5834
5835 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5836 if (err < 0)
5837 goto err_reg_dflt;
5838#endif
5839 return 0;
5840
5841#ifdef CONFIG_SYSCTL
5842err_reg_dflt:
5843 __addrconf_sysctl_unregister(all);
5844err_reg_all:
5845 kfree(dflt);
5846#endif
5847err_alloc_dflt:
5848 kfree(all);
5849err_alloc_all:
5850 return err;
5851}
5852
5853static void __net_exit addrconf_exit_net(struct net *net)
5854{
5855#ifdef CONFIG_SYSCTL
5856 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5857 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5858#endif
5859 kfree(net->ipv6.devconf_dflt);
5860 kfree(net->ipv6.devconf_all);
5861}
5862
5863static struct pernet_operations addrconf_ops = {
5864 .init = addrconf_init_net,
5865 .exit = addrconf_exit_net,
5866};
5867
5868static struct rtnl_af_ops inet6_ops __read_mostly = {
5869 .family = AF_INET6,
5870 .fill_link_af = inet6_fill_link_af,
5871 .get_link_af_size = inet6_get_link_af_size,
5872 .validate_link_af = inet6_validate_link_af,
5873 .set_link_af = inet6_set_link_af,
5874};
5875
5876/*
5877 * Init / cleanup code
5878 */
5879
5880int __init addrconf_init(void)
5881{
5882 struct inet6_dev *idev;
5883 int i, err;
5884
5885 err = ipv6_addr_label_init();
5886 if (err < 0) {
5887 pr_crit("%s: cannot initialize default policy table: %d\n",
5888 __func__, err);
5889 goto out;
5890 }
5891
5892 err = register_pernet_subsys(&addrconf_ops);
5893 if (err < 0)
5894 goto out_addrlabel;
5895
5896 addrconf_wq = create_workqueue("ipv6_addrconf");
5897 if (!addrconf_wq) {
5898 err = -ENOMEM;
5899 goto out_nowq;
5900 }
5901
5902 /* The addrconf netdev notifier requires that loopback_dev
5903 * has it's ipv6 private information allocated and setup
5904 * before it can bring up and give link-local addresses
5905 * to other devices which are up.
5906 *
5907 * Unfortunately, loopback_dev is not necessarily the first
5908 * entry in the global dev_base list of net devices. In fact,
5909 * it is likely to be the very last entry on that list.
5910 * So this causes the notifier registry below to try and
5911 * give link-local addresses to all devices besides loopback_dev
5912 * first, then loopback_dev, which cases all the non-loopback_dev
5913 * devices to fail to get a link-local address.
5914 *
5915 * So, as a temporary fix, allocate the ipv6 structure for
5916 * loopback_dev first by hand.
5917 * Longer term, all of the dependencies ipv6 has upon the loopback
5918 * device and it being up should be removed.
5919 */
5920 rtnl_lock();
5921 idev = ipv6_add_dev(init_net.loopback_dev);
5922 rtnl_unlock();
5923 if (IS_ERR(idev)) {
5924 err = PTR_ERR(idev);
5925 goto errlo;
5926 }
5927
5928 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5929 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5930
5931 register_netdevice_notifier(&ipv6_dev_notf);
5932
5933 addrconf_verify();
5934
5935 rtnl_af_register(&inet6_ops);
5936
5937 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5938 NULL);
5939 if (err < 0)
5940 goto errout;
5941
5942 /* Only the first call to __rtnl_register can fail */
5943 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5944 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5945 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5946 inet6_dump_ifaddr, NULL);
5947 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5948 inet6_dump_ifmcaddr, NULL);
5949 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5950 inet6_dump_ifacaddr, NULL);
5951 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5952 inet6_netconf_dump_devconf, NULL);
5953
5954 ipv6_addr_label_rtnl_register();
5955
5956 return 0;
5957errout:
5958 rtnl_af_unregister(&inet6_ops);
5959 unregister_netdevice_notifier(&ipv6_dev_notf);
5960errlo:
5961 destroy_workqueue(addrconf_wq);
5962out_nowq:
5963 unregister_pernet_subsys(&addrconf_ops);
5964out_addrlabel:
5965 ipv6_addr_label_cleanup();
5966out:
5967 return err;
5968}
5969
5970void addrconf_cleanup(void)
5971{
5972 struct net_device *dev;
5973 int i;
5974
5975 unregister_netdevice_notifier(&ipv6_dev_notf);
5976 unregister_pernet_subsys(&addrconf_ops);
5977 ipv6_addr_label_cleanup();
5978
5979 rtnl_lock();
5980
5981 __rtnl_af_unregister(&inet6_ops);
5982
5983 /* clean dev list */
5984 for_each_netdev(&init_net, dev) {
5985 if (__in6_dev_get(dev) == NULL)
5986 continue;
5987 addrconf_ifdown(dev, 1);
5988 }
5989 addrconf_ifdown(init_net.loopback_dev, 2);
5990
5991 /*
5992 * Check hash table.
5993 */
5994 spin_lock_bh(&addrconf_hash_lock);
5995 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5996 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
5997 spin_unlock_bh(&addrconf_hash_lock);
5998 cancel_delayed_work(&addr_chk_work);
5999 rtnl_unlock();
6000
6001 destroy_workqueue(addrconf_wq);
6002}
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