blob: 92174881844d5dea2375e4dedce6ee5f9537c317 [file] [log] [blame]
Kyle Swenson8d8f6542021-03-15 11:02:55 -06001/*
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 in6_ifa_hold(ifp);
295 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
296 in6_ifa_put(ifp);
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
354 if (ndev->cnf.stable_secret.initialized)
355 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
356 else
357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
358
359 ndev->cnf.mtu6 = dev->mtu;
360 ndev->cnf.sysctl = NULL;
361 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
362 if (!ndev->nd_parms) {
363 kfree(ndev);
364 return ERR_PTR(err);
365 }
366 if (ndev->cnf.forwarding)
367 dev_disable_lro(dev);
368 /* We refer to the device */
369 dev_hold(dev);
370
371 if (snmp6_alloc_dev(ndev) < 0) {
372 ADBG(KERN_WARNING
373 "%s: cannot allocate memory for statistics; dev=%s.\n",
374 __func__, dev->name);
375 neigh_parms_release(&nd_tbl, ndev->nd_parms);
376 dev_put(dev);
377 kfree(ndev);
378 return ERR_PTR(err);
379 }
380
381 if (snmp6_register_dev(ndev) < 0) {
382 ADBG(KERN_WARNING
383 "%s: cannot create /proc/net/dev_snmp6/%s\n",
384 __func__, dev->name);
385 goto err_release;
386 }
387
388 /* One reference from device. We must do this before
389 * we invoke __ipv6_regen_rndid().
390 */
391 in6_dev_hold(ndev);
392
393 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
394 ndev->cnf.accept_dad = -1;
395
396#if IS_ENABLED(CONFIG_IPV6_SIT)
397 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
398 pr_info("%s: Disabled Multicast RS\n", dev->name);
399 ndev->cnf.rtr_solicits = 0;
400 }
401#endif
402
403 INIT_LIST_HEAD(&ndev->tempaddr_list);
404 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
405 if ((dev->flags&IFF_LOOPBACK) ||
406 dev->type == ARPHRD_TUNNEL ||
407 dev->type == ARPHRD_TUNNEL6 ||
408 dev->type == ARPHRD_SIT ||
409 dev->type == ARPHRD_NONE) {
410 ndev->cnf.use_tempaddr = -1;
411 } else {
412 in6_dev_hold(ndev);
413 ipv6_regen_rndid((unsigned long) ndev);
414 }
415
416 ndev->token = in6addr_any;
417
418 if (netif_running(dev) && addrconf_qdisc_ok(dev))
419 ndev->if_flags |= IF_READY;
420
421 ipv6_mc_init_dev(ndev);
422 ndev->tstamp = jiffies;
423 err = addrconf_sysctl_register(ndev);
424 if (err) {
425 ipv6_mc_destroy_dev(ndev);
426 del_timer(&ndev->regen_timer);
427 snmp6_unregister_dev(ndev);
428 goto err_release;
429 }
430 /* protected by rtnl_lock */
431 rcu_assign_pointer(dev->ip6_ptr, ndev);
432
433 /* Join interface-local all-node multicast group */
434 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
435
436 /* Join all-node multicast group */
437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
438
439 /* Join all-router multicast group if forwarding is set */
440 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
442
443 return ndev;
444
445err_release:
446 neigh_parms_release(&nd_tbl, ndev->nd_parms);
447 ndev->dead = 1;
448 in6_dev_finish_destroy(ndev);
449 return ERR_PTR(err);
450}
451
452static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
453{
454 struct inet6_dev *idev;
455
456 ASSERT_RTNL();
457
458 idev = __in6_dev_get(dev);
459 if (!idev) {
460 idev = ipv6_add_dev(dev);
461 if (IS_ERR(idev))
462 return NULL;
463 }
464
465 if (dev->flags&IFF_UP)
466 ipv6_mc_up(idev);
467 return idev;
468}
469
470static int inet6_netconf_msgsize_devconf(int type)
471{
472 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
473 + nla_total_size(4); /* NETCONFA_IFINDEX */
474
475 /* type -1 is used for ALL */
476 if (type == -1 || type == NETCONFA_FORWARDING)
477 size += nla_total_size(4);
478#ifdef CONFIG_IPV6_MROUTE
479 if (type == -1 || type == NETCONFA_MC_FORWARDING)
480 size += nla_total_size(4);
481#endif
482 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
483 size += nla_total_size(4);
484
485 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
486 size += nla_total_size(4);
487
488 return size;
489}
490
491static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
492 struct ipv6_devconf *devconf, u32 portid,
493 u32 seq, int event, unsigned int flags,
494 int type)
495{
496 struct nlmsghdr *nlh;
497 struct netconfmsg *ncm;
498
499 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
500 flags);
501 if (!nlh)
502 return -EMSGSIZE;
503
504 ncm = nlmsg_data(nlh);
505 ncm->ncm_family = AF_INET6;
506
507 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
508 goto nla_put_failure;
509
510 /* type -1 is used for ALL */
511 if ((type == -1 || type == NETCONFA_FORWARDING) &&
512 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
513 goto nla_put_failure;
514#ifdef CONFIG_IPV6_MROUTE
515 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
516 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
517 devconf->mc_forwarding) < 0)
518 goto nla_put_failure;
519#endif
520 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
521 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
522 goto nla_put_failure;
523
524 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
525 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
526 devconf->ignore_routes_with_linkdown) < 0)
527 goto nla_put_failure;
528
529 nlmsg_end(skb, nlh);
530 return 0;
531
532nla_put_failure:
533 nlmsg_cancel(skb, nlh);
534 return -EMSGSIZE;
535}
536
537void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
538 struct ipv6_devconf *devconf)
539{
540 struct sk_buff *skb;
541 int err = -ENOBUFS;
542
543 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
544 if (!skb)
545 goto errout;
546
547 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
548 RTM_NEWNETCONF, 0, type);
549 if (err < 0) {
550 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
551 WARN_ON(err == -EMSGSIZE);
552 kfree_skb(skb);
553 goto errout;
554 }
555 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
556 return;
557errout:
558 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
559}
560
561static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
562 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
563 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
564 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
565 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
566};
567
568static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
569 struct nlmsghdr *nlh)
570{
571 struct net *net = sock_net(in_skb->sk);
572 struct nlattr *tb[NETCONFA_MAX+1];
573 struct netconfmsg *ncm;
574 struct sk_buff *skb;
575 struct ipv6_devconf *devconf;
576 struct inet6_dev *in6_dev;
577 struct net_device *dev;
578 int ifindex;
579 int err;
580
581 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
582 devconf_ipv6_policy);
583 if (err < 0)
584 goto errout;
585
586 err = -EINVAL;
587 if (!tb[NETCONFA_IFINDEX])
588 goto errout;
589
590 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
591 switch (ifindex) {
592 case NETCONFA_IFINDEX_ALL:
593 devconf = net->ipv6.devconf_all;
594 break;
595 case NETCONFA_IFINDEX_DEFAULT:
596 devconf = net->ipv6.devconf_dflt;
597 break;
598 default:
599 dev = __dev_get_by_index(net, ifindex);
600 if (!dev)
601 goto errout;
602 in6_dev = __in6_dev_get(dev);
603 if (!in6_dev)
604 goto errout;
605 devconf = &in6_dev->cnf;
606 break;
607 }
608
609 err = -ENOBUFS;
610 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
611 if (!skb)
612 goto errout;
613
614 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
615 NETLINK_CB(in_skb).portid,
616 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
617 -1);
618 if (err < 0) {
619 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
620 WARN_ON(err == -EMSGSIZE);
621 kfree_skb(skb);
622 goto errout;
623 }
624 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
625errout:
626 return err;
627}
628
629static int inet6_netconf_dump_devconf(struct sk_buff *skb,
630 struct netlink_callback *cb)
631{
632 struct net *net = sock_net(skb->sk);
633 int h, s_h;
634 int idx, s_idx;
635 struct net_device *dev;
636 struct inet6_dev *idev;
637 struct hlist_head *head;
638
639 s_h = cb->args[0];
640 s_idx = idx = cb->args[1];
641
642 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
643 idx = 0;
644 head = &net->dev_index_head[h];
645 rcu_read_lock();
646 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
647 net->dev_base_seq;
648 hlist_for_each_entry_rcu(dev, head, index_hlist) {
649 if (idx < s_idx)
650 goto cont;
651 idev = __in6_dev_get(dev);
652 if (!idev)
653 goto cont;
654
655 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
656 &idev->cnf,
657 NETLINK_CB(cb->skb).portid,
658 cb->nlh->nlmsg_seq,
659 RTM_NEWNETCONF,
660 NLM_F_MULTI,
661 -1) < 0) {
662 rcu_read_unlock();
663 goto done;
664 }
665 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
666cont:
667 idx++;
668 }
669 rcu_read_unlock();
670 }
671 if (h == NETDEV_HASHENTRIES) {
672 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
673 net->ipv6.devconf_all,
674 NETLINK_CB(cb->skb).portid,
675 cb->nlh->nlmsg_seq,
676 RTM_NEWNETCONF, NLM_F_MULTI,
677 -1) < 0)
678 goto done;
679 else
680 h++;
681 }
682 if (h == NETDEV_HASHENTRIES + 1) {
683 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
684 net->ipv6.devconf_dflt,
685 NETLINK_CB(cb->skb).portid,
686 cb->nlh->nlmsg_seq,
687 RTM_NEWNETCONF, NLM_F_MULTI,
688 -1) < 0)
689 goto done;
690 else
691 h++;
692 }
693done:
694 cb->args[0] = h;
695 cb->args[1] = idx;
696
697 return skb->len;
698}
699
700#ifdef CONFIG_SYSCTL
701static void dev_forward_change(struct inet6_dev *idev)
702{
703 struct net_device *dev;
704 struct inet6_ifaddr *ifa;
705
706 if (!idev)
707 return;
708 dev = idev->dev;
709 if (idev->cnf.forwarding)
710 dev_disable_lro(dev);
711 if (dev->flags & IFF_MULTICAST) {
712 if (idev->cnf.forwarding) {
713 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
714 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
715 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
716 } else {
717 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
718 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
719 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
720 }
721 }
722
723 list_for_each_entry(ifa, &idev->addr_list, if_list) {
724 if (ifa->flags&IFA_F_TENTATIVE)
725 continue;
726 if (idev->cnf.forwarding)
727 addrconf_join_anycast(ifa);
728 else
729 addrconf_leave_anycast(ifa);
730 }
731 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
732 dev->ifindex, &idev->cnf);
733}
734
735
736static void addrconf_forward_change(struct net *net, __s32 newf)
737{
738 struct net_device *dev;
739 struct inet6_dev *idev;
740
741 for_each_netdev(net, dev) {
742 idev = __in6_dev_get(dev);
743 if (idev) {
744 int changed = (!idev->cnf.forwarding) ^ (!newf);
745 idev->cnf.forwarding = newf;
746 if (changed)
747 dev_forward_change(idev);
748 }
749 }
750}
751
752static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
753{
754 struct net *net;
755 int old;
756
757 if (!rtnl_trylock())
758 return restart_syscall();
759
760 net = (struct net *)table->extra2;
761 old = *p;
762 *p = newf;
763
764 if (p == &net->ipv6.devconf_dflt->forwarding) {
765 if ((!newf) ^ (!old))
766 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
767 NETCONFA_IFINDEX_DEFAULT,
768 net->ipv6.devconf_dflt);
769 rtnl_unlock();
770 return 0;
771 }
772
773 if (p == &net->ipv6.devconf_all->forwarding) {
774 net->ipv6.devconf_dflt->forwarding = newf;
775 addrconf_forward_change(net, newf);
776 if ((!newf) ^ (!old))
777 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
778 NETCONFA_IFINDEX_ALL,
779 net->ipv6.devconf_all);
780 } else if ((!newf) ^ (!old))
781 dev_forward_change((struct inet6_dev *)table->extra1);
782 rtnl_unlock();
783
784 if (newf)
785 rt6_purge_dflt_routers(net);
786 return 1;
787}
788
789static void addrconf_linkdown_change(struct net *net, __s32 newf)
790{
791 struct net_device *dev;
792 struct inet6_dev *idev;
793
794 for_each_netdev(net, dev) {
795 idev = __in6_dev_get(dev);
796 if (idev) {
797 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
798
799 idev->cnf.ignore_routes_with_linkdown = newf;
800 if (changed)
801 inet6_netconf_notify_devconf(dev_net(dev),
802 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
803 dev->ifindex,
804 &idev->cnf);
805 }
806 }
807}
808
809static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
810{
811 struct net *net;
812 int old;
813
814 if (!rtnl_trylock())
815 return restart_syscall();
816
817 net = (struct net *)table->extra2;
818 old = *p;
819 *p = newf;
820
821 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
822 if ((!newf) ^ (!old))
823 inet6_netconf_notify_devconf(net,
824 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
825 NETCONFA_IFINDEX_DEFAULT,
826 net->ipv6.devconf_dflt);
827 rtnl_unlock();
828 return 0;
829 }
830
831 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
832 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
833 addrconf_linkdown_change(net, newf);
834 if ((!newf) ^ (!old))
835 inet6_netconf_notify_devconf(net,
836 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
837 NETCONFA_IFINDEX_ALL,
838 net->ipv6.devconf_all);
839 }
840 rtnl_unlock();
841
842 return 1;
843}
844
845#endif
846
847/* Nobody refers to this ifaddr, destroy it */
848void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
849{
850 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
851
852#ifdef NET_REFCNT_DEBUG
853 pr_debug("%s\n", __func__);
854#endif
855
856 in6_dev_put(ifp->idev);
857
858 if (cancel_delayed_work(&ifp->dad_work))
859 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
860 ifp);
861
862 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
863 pr_warn("Freeing alive inet6 address %p\n", ifp);
864 return;
865 }
866 ip6_rt_put(ifp->rt);
867
868 kfree_rcu(ifp, rcu);
869}
870
871static void
872ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
873{
874 struct list_head *p;
875 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
876
877 /*
878 * Each device address list is sorted in order of scope -
879 * global before linklocal.
880 */
881 list_for_each(p, &idev->addr_list) {
882 struct inet6_ifaddr *ifa
883 = list_entry(p, struct inet6_ifaddr, if_list);
884 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
885 break;
886 }
887
888 list_add_tail(&ifp->if_list, p);
889}
890
891static u32 inet6_addr_hash(const struct in6_addr *addr)
892{
893 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
894}
895
896/* On success it returns ifp with increased reference count */
897
898static struct inet6_ifaddr *
899ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
900 const struct in6_addr *peer_addr, int pfxlen,
901 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
902{
903 struct inet6_ifaddr *ifa = NULL;
904 struct rt6_info *rt;
905 unsigned int hash;
906 int err = 0;
907 int addr_type = ipv6_addr_type(addr);
908
909 if (addr_type == IPV6_ADDR_ANY ||
910 addr_type & IPV6_ADDR_MULTICAST ||
911 (!(idev->dev->flags & IFF_LOOPBACK) &&
912 addr_type & IPV6_ADDR_LOOPBACK))
913 return ERR_PTR(-EADDRNOTAVAIL);
914
915 rcu_read_lock_bh();
916 if (idev->dead) {
917 err = -ENODEV; /*XXX*/
918 goto out2;
919 }
920
921 if (idev->cnf.disable_ipv6) {
922 err = -EACCES;
923 goto out2;
924 }
925
926 spin_lock(&addrconf_hash_lock);
927
928 /* Ignore adding duplicate addresses on an interface */
929 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
930 ADBG("ipv6_add_addr: already assigned\n");
931 err = -EEXIST;
932 goto out;
933 }
934
935 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
936
937 if (!ifa) {
938 ADBG("ipv6_add_addr: malloc failed\n");
939 err = -ENOBUFS;
940 goto out;
941 }
942
943 rt = addrconf_dst_alloc(idev, addr, false);
944 if (IS_ERR(rt)) {
945 err = PTR_ERR(rt);
946 goto out;
947 }
948
949 neigh_parms_data_state_setall(idev->nd_parms);
950
951 ifa->addr = *addr;
952 if (peer_addr)
953 ifa->peer_addr = *peer_addr;
954
955 spin_lock_init(&ifa->lock);
956 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
957 INIT_HLIST_NODE(&ifa->addr_lst);
958 ifa->scope = scope;
959 ifa->prefix_len = pfxlen;
960 ifa->flags = flags | IFA_F_TENTATIVE;
961 ifa->valid_lft = valid_lft;
962 ifa->prefered_lft = prefered_lft;
963 ifa->cstamp = ifa->tstamp = jiffies;
964 ifa->tokenized = false;
965
966 ifa->rt = rt;
967
968 ifa->idev = idev;
969 in6_dev_hold(idev);
970 /* For caller */
971 in6_ifa_hold(ifa);
972
973 /* Add to big hash table */
974 hash = inet6_addr_hash(addr);
975
976 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
977 spin_unlock(&addrconf_hash_lock);
978
979 write_lock(&idev->lock);
980 /* Add to inet6_dev unicast addr list. */
981 ipv6_link_dev_addr(idev, ifa);
982
983 if (ifa->flags&IFA_F_TEMPORARY) {
984 list_add(&ifa->tmp_list, &idev->tempaddr_list);
985 in6_ifa_hold(ifa);
986 }
987
988 in6_ifa_hold(ifa);
989 write_unlock(&idev->lock);
990out2:
991 rcu_read_unlock_bh();
992
993 if (likely(err == 0))
994 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
995 else {
996 kfree(ifa);
997 ifa = ERR_PTR(err);
998 }
999
1000 return ifa;
1001out:
1002 spin_unlock(&addrconf_hash_lock);
1003 goto out2;
1004}
1005
1006enum cleanup_prefix_rt_t {
1007 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1008 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1009 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1010};
1011
1012/*
1013 * Check, whether the prefix for ifp would still need a prefix route
1014 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1015 * constants.
1016 *
1017 * 1) we don't purge prefix if address was not permanent.
1018 * prefix is managed by its own lifetime.
1019 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1020 * 3) if there are no addresses, delete prefix.
1021 * 4) if there are still other permanent address(es),
1022 * corresponding prefix is still permanent.
1023 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1024 * don't purge the prefix, assume user space is managing it.
1025 * 6) otherwise, update prefix lifetime to the
1026 * longest valid lifetime among the corresponding
1027 * addresses on the device.
1028 * Note: subsequent RA will update lifetime.
1029 **/
1030static enum cleanup_prefix_rt_t
1031check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1032{
1033 struct inet6_ifaddr *ifa;
1034 struct inet6_dev *idev = ifp->idev;
1035 unsigned long lifetime;
1036 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1037
1038 *expires = jiffies;
1039
1040 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1041 if (ifa == ifp)
1042 continue;
1043 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1044 ifp->prefix_len))
1045 continue;
1046 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1047 return CLEANUP_PREFIX_RT_NOP;
1048
1049 action = CLEANUP_PREFIX_RT_EXPIRE;
1050
1051 spin_lock(&ifa->lock);
1052
1053 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1054 /*
1055 * Note: Because this address is
1056 * not permanent, lifetime <
1057 * LONG_MAX / HZ here.
1058 */
1059 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1060 *expires = ifa->tstamp + lifetime * HZ;
1061 spin_unlock(&ifa->lock);
1062 }
1063
1064 return action;
1065}
1066
1067static void
1068cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1069{
1070 struct rt6_info *rt;
1071
1072 rt = addrconf_get_prefix_route(&ifp->addr,
1073 ifp->prefix_len,
1074 ifp->idev->dev,
1075 0, RTF_GATEWAY | RTF_DEFAULT);
1076 if (rt) {
1077 if (del_rt)
1078 ip6_del_rt(rt);
1079 else {
1080 if (!(rt->rt6i_flags & RTF_EXPIRES))
1081 rt6_set_expires(rt, expires);
1082 ip6_rt_put(rt);
1083 }
1084 }
1085}
1086
1087
1088/* This function wants to get referenced ifp and releases it before return */
1089
1090static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1091{
1092 int state;
1093 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1094 unsigned long expires;
1095
1096 ASSERT_RTNL();
1097
1098 spin_lock_bh(&ifp->lock);
1099 state = ifp->state;
1100 ifp->state = INET6_IFADDR_STATE_DEAD;
1101 spin_unlock_bh(&ifp->lock);
1102
1103 if (state == INET6_IFADDR_STATE_DEAD)
1104 goto out;
1105
1106 spin_lock_bh(&addrconf_hash_lock);
1107 hlist_del_init_rcu(&ifp->addr_lst);
1108 spin_unlock_bh(&addrconf_hash_lock);
1109
1110 write_lock_bh(&ifp->idev->lock);
1111
1112 if (ifp->flags&IFA_F_TEMPORARY) {
1113 list_del(&ifp->tmp_list);
1114 if (ifp->ifpub) {
1115 in6_ifa_put(ifp->ifpub);
1116 ifp->ifpub = NULL;
1117 }
1118 __in6_ifa_put(ifp);
1119 }
1120
1121 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1122 action = check_cleanup_prefix_route(ifp, &expires);
1123
1124 list_del_init(&ifp->if_list);
1125 __in6_ifa_put(ifp);
1126
1127 write_unlock_bh(&ifp->idev->lock);
1128
1129 addrconf_del_dad_work(ifp);
1130
1131 ipv6_ifa_notify(RTM_DELADDR, ifp);
1132
1133 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1134
1135 if (action != CLEANUP_PREFIX_RT_NOP) {
1136 cleanup_prefix_route(ifp, expires,
1137 action == CLEANUP_PREFIX_RT_DEL);
1138 }
1139
1140 /* clean up prefsrc entries */
1141 rt6_remove_prefsrc(ifp);
1142out:
1143 in6_ifa_put(ifp);
1144}
1145
1146static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1147{
1148 struct inet6_dev *idev = ifp->idev;
1149 struct in6_addr addr, *tmpaddr;
1150 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1151 unsigned long regen_advance;
1152 int tmp_plen;
1153 int ret = 0;
1154 u32 addr_flags;
1155 unsigned long now = jiffies;
1156
1157 write_lock_bh(&idev->lock);
1158 if (ift) {
1159 spin_lock_bh(&ift->lock);
1160 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1161 spin_unlock_bh(&ift->lock);
1162 tmpaddr = &addr;
1163 } else {
1164 tmpaddr = NULL;
1165 }
1166retry:
1167 in6_dev_hold(idev);
1168 if (idev->cnf.use_tempaddr <= 0) {
1169 write_unlock_bh(&idev->lock);
1170 pr_info("%s: use_tempaddr is disabled\n", __func__);
1171 in6_dev_put(idev);
1172 ret = -1;
1173 goto out;
1174 }
1175 spin_lock_bh(&ifp->lock);
1176 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1177 idev->cnf.use_tempaddr = -1; /*XXX*/
1178 spin_unlock_bh(&ifp->lock);
1179 write_unlock_bh(&idev->lock);
1180 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1181 __func__);
1182 in6_dev_put(idev);
1183 ret = -1;
1184 goto out;
1185 }
1186 in6_ifa_hold(ifp);
1187 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1188 __ipv6_try_regen_rndid(idev, tmpaddr);
1189 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1190 age = (now - ifp->tstamp) / HZ;
1191 tmp_valid_lft = min_t(__u32,
1192 ifp->valid_lft,
1193 idev->cnf.temp_valid_lft + age);
1194 tmp_prefered_lft = min_t(__u32,
1195 ifp->prefered_lft,
1196 idev->cnf.temp_prefered_lft + age -
1197 idev->cnf.max_desync_factor);
1198 tmp_plen = ifp->prefix_len;
1199 tmp_tstamp = ifp->tstamp;
1200 spin_unlock_bh(&ifp->lock);
1201
1202 regen_advance = idev->cnf.regen_max_retry *
1203 idev->cnf.dad_transmits *
1204 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1205 write_unlock_bh(&idev->lock);
1206
1207 /* A temporary address is created only if this calculated Preferred
1208 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1209 * an implementation must not create a temporary address with a zero
1210 * Preferred Lifetime.
1211 * Use age calculation as in addrconf_verify to avoid unnecessary
1212 * temporary addresses being generated.
1213 */
1214 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1215 if (tmp_prefered_lft <= regen_advance + age) {
1216 in6_ifa_put(ifp);
1217 in6_dev_put(idev);
1218 ret = -1;
1219 goto out;
1220 }
1221
1222 addr_flags = IFA_F_TEMPORARY;
1223 /* set in addrconf_prefix_rcv() */
1224 if (ifp->flags & IFA_F_OPTIMISTIC)
1225 addr_flags |= IFA_F_OPTIMISTIC;
1226
1227 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1228 ipv6_addr_scope(&addr), addr_flags,
1229 tmp_valid_lft, tmp_prefered_lft);
1230 if (IS_ERR(ift)) {
1231 in6_ifa_put(ifp);
1232 in6_dev_put(idev);
1233 pr_info("%s: retry temporary address regeneration\n", __func__);
1234 tmpaddr = &addr;
1235 write_lock_bh(&idev->lock);
1236 goto retry;
1237 }
1238
1239 spin_lock_bh(&ift->lock);
1240 ift->ifpub = ifp;
1241 ift->cstamp = now;
1242 ift->tstamp = tmp_tstamp;
1243 spin_unlock_bh(&ift->lock);
1244
1245 addrconf_dad_start(ift);
1246 in6_ifa_put(ift);
1247 in6_dev_put(idev);
1248out:
1249 return ret;
1250}
1251
1252/*
1253 * Choose an appropriate source address (RFC3484)
1254 */
1255enum {
1256 IPV6_SADDR_RULE_INIT = 0,
1257 IPV6_SADDR_RULE_LOCAL,
1258 IPV6_SADDR_RULE_SCOPE,
1259 IPV6_SADDR_RULE_PREFERRED,
1260#ifdef CONFIG_IPV6_MIP6
1261 IPV6_SADDR_RULE_HOA,
1262#endif
1263 IPV6_SADDR_RULE_OIF,
1264 IPV6_SADDR_RULE_LABEL,
1265 IPV6_SADDR_RULE_PRIVACY,
1266 IPV6_SADDR_RULE_ORCHID,
1267 IPV6_SADDR_RULE_PREFIX,
1268#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1269 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1270#endif
1271 IPV6_SADDR_RULE_MAX
1272};
1273
1274struct ipv6_saddr_score {
1275 int rule;
1276 int addr_type;
1277 struct inet6_ifaddr *ifa;
1278 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1279 int scopedist;
1280 int matchlen;
1281};
1282
1283struct ipv6_saddr_dst {
1284 const struct in6_addr *addr;
1285 int ifindex;
1286 int scope;
1287 int label;
1288 unsigned int prefs;
1289};
1290
1291static inline int ipv6_saddr_preferred(int type)
1292{
1293 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1294 return 1;
1295 return 0;
1296}
1297
1298static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1299{
1300#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1301 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1302#else
1303 return false;
1304#endif
1305}
1306
1307static int ipv6_get_saddr_eval(struct net *net,
1308 struct ipv6_saddr_score *score,
1309 struct ipv6_saddr_dst *dst,
1310 int i)
1311{
1312 int ret;
1313
1314 if (i <= score->rule) {
1315 switch (i) {
1316 case IPV6_SADDR_RULE_SCOPE:
1317 ret = score->scopedist;
1318 break;
1319 case IPV6_SADDR_RULE_PREFIX:
1320 ret = score->matchlen;
1321 break;
1322 default:
1323 ret = !!test_bit(i, score->scorebits);
1324 }
1325 goto out;
1326 }
1327
1328 switch (i) {
1329 case IPV6_SADDR_RULE_INIT:
1330 /* Rule 0: remember if hiscore is not ready yet */
1331 ret = !!score->ifa;
1332 break;
1333 case IPV6_SADDR_RULE_LOCAL:
1334 /* Rule 1: Prefer same address */
1335 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1336 break;
1337 case IPV6_SADDR_RULE_SCOPE:
1338 /* Rule 2: Prefer appropriate scope
1339 *
1340 * ret
1341 * ^
1342 * -1 | d 15
1343 * ---+--+-+---> scope
1344 * |
1345 * | d is scope of the destination.
1346 * B-d | \
1347 * | \ <- smaller scope is better if
1348 * B-15 | \ if scope is enough for destination.
1349 * | ret = B - scope (-1 <= scope >= d <= 15).
1350 * d-C-1 | /
1351 * |/ <- greater is better
1352 * -C / if scope is not enough for destination.
1353 * /| ret = scope - C (-1 <= d < scope <= 15).
1354 *
1355 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1356 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1357 * Assume B = 0 and we get C > 29.
1358 */
1359 ret = __ipv6_addr_src_scope(score->addr_type);
1360 if (ret >= dst->scope)
1361 ret = -ret;
1362 else
1363 ret -= 128; /* 30 is enough */
1364 score->scopedist = ret;
1365 break;
1366 case IPV6_SADDR_RULE_PREFERRED:
1367 {
1368 /* Rule 3: Avoid deprecated and optimistic addresses */
1369 u8 avoid = IFA_F_DEPRECATED;
1370
1371 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1372 avoid |= IFA_F_OPTIMISTIC;
1373 ret = ipv6_saddr_preferred(score->addr_type) ||
1374 !(score->ifa->flags & avoid);
1375 break;
1376 }
1377#ifdef CONFIG_IPV6_MIP6
1378 case IPV6_SADDR_RULE_HOA:
1379 {
1380 /* Rule 4: Prefer home address */
1381 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1382 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1383 break;
1384 }
1385#endif
1386 case IPV6_SADDR_RULE_OIF:
1387 /* Rule 5: Prefer outgoing interface */
1388 ret = (!dst->ifindex ||
1389 dst->ifindex == score->ifa->idev->dev->ifindex);
1390 break;
1391 case IPV6_SADDR_RULE_LABEL:
1392 /* Rule 6: Prefer matching label */
1393 ret = ipv6_addr_label(net,
1394 &score->ifa->addr, score->addr_type,
1395 score->ifa->idev->dev->ifindex) == dst->label;
1396 break;
1397 case IPV6_SADDR_RULE_PRIVACY:
1398 {
1399 /* Rule 7: Prefer public address
1400 * Note: prefer temporary address if use_tempaddr >= 2
1401 */
1402 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1403 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1404 score->ifa->idev->cnf.use_tempaddr >= 2;
1405 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1406 break;
1407 }
1408 case IPV6_SADDR_RULE_ORCHID:
1409 /* Rule 8-: Prefer ORCHID vs ORCHID or
1410 * non-ORCHID vs non-ORCHID
1411 */
1412 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1413 ipv6_addr_orchid(dst->addr));
1414 break;
1415 case IPV6_SADDR_RULE_PREFIX:
1416 /* Rule 8: Use longest matching prefix */
1417 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1418 if (ret > score->ifa->prefix_len)
1419 ret = score->ifa->prefix_len;
1420 score->matchlen = ret;
1421 break;
1422#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1423 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1424 /* Optimistic addresses still have lower precedence than other
1425 * preferred addresses.
1426 */
1427 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1428 break;
1429#endif
1430 default:
1431 ret = 0;
1432 }
1433
1434 if (ret)
1435 __set_bit(i, score->scorebits);
1436 score->rule = i;
1437out:
1438 return ret;
1439}
1440
1441static int __ipv6_dev_get_saddr(struct net *net,
1442 struct ipv6_saddr_dst *dst,
1443 struct inet6_dev *idev,
1444 struct ipv6_saddr_score *scores,
1445 int hiscore_idx)
1446{
1447 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1448
1449 read_lock_bh(&idev->lock);
1450 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1451 int i;
1452
1453 /*
1454 * - Tentative Address (RFC2462 section 5.4)
1455 * - A tentative address is not considered
1456 * "assigned to an interface" in the traditional
1457 * sense, unless it is also flagged as optimistic.
1458 * - Candidate Source Address (section 4)
1459 * - In any case, anycast addresses, multicast
1460 * addresses, and the unspecified address MUST
1461 * NOT be included in a candidate set.
1462 */
1463 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1464 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1465 continue;
1466
1467 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1468
1469 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1470 score->addr_type & IPV6_ADDR_MULTICAST)) {
1471 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1472 idev->dev->name);
1473 continue;
1474 }
1475
1476 score->rule = -1;
1477 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1478
1479 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1480 int minihiscore, miniscore;
1481
1482 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1483 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1484
1485 if (minihiscore > miniscore) {
1486 if (i == IPV6_SADDR_RULE_SCOPE &&
1487 score->scopedist > 0) {
1488 /*
1489 * special case:
1490 * each remaining entry
1491 * has too small (not enough)
1492 * scope, because ifa entries
1493 * are sorted by their scope
1494 * values.
1495 */
1496 goto out;
1497 }
1498 break;
1499 } else if (minihiscore < miniscore) {
1500 if (hiscore->ifa)
1501 in6_ifa_put(hiscore->ifa);
1502
1503 in6_ifa_hold(score->ifa);
1504
1505 swap(hiscore, score);
1506 hiscore_idx = 1 - hiscore_idx;
1507
1508 /* restore our iterator */
1509 score->ifa = hiscore->ifa;
1510
1511 break;
1512 }
1513 }
1514 }
1515out:
1516 read_unlock_bh(&idev->lock);
1517 return hiscore_idx;
1518}
1519
1520int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1521 const struct in6_addr *daddr, unsigned int prefs,
1522 struct in6_addr *saddr)
1523{
1524 struct ipv6_saddr_score scores[2], *hiscore;
1525 struct ipv6_saddr_dst dst;
1526 struct inet6_dev *idev;
1527 struct net_device *dev;
1528 int dst_type;
1529 bool use_oif_addr = false;
1530 int hiscore_idx = 0;
1531
1532 dst_type = __ipv6_addr_type(daddr);
1533 dst.addr = daddr;
1534 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1535 dst.scope = __ipv6_addr_src_scope(dst_type);
1536 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1537 dst.prefs = prefs;
1538
1539 scores[hiscore_idx].rule = -1;
1540 scores[hiscore_idx].ifa = NULL;
1541
1542 rcu_read_lock();
1543
1544 /* Candidate Source Address (section 4)
1545 * - multicast and link-local destination address,
1546 * the set of candidate source address MUST only
1547 * include addresses assigned to interfaces
1548 * belonging to the same link as the outgoing
1549 * interface.
1550 * (- For site-local destination addresses, the
1551 * set of candidate source addresses MUST only
1552 * include addresses assigned to interfaces
1553 * belonging to the same site as the outgoing
1554 * interface.)
1555 * - "It is RECOMMENDED that the candidate source addresses
1556 * be the set of unicast addresses assigned to the
1557 * interface that will be used to send to the destination
1558 * (the 'outgoing' interface)." (RFC 6724)
1559 */
1560 if (dst_dev) {
1561 idev = __in6_dev_get(dst_dev);
1562 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1563 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1564 (idev && idev->cnf.use_oif_addrs_only)) {
1565 use_oif_addr = true;
1566 }
1567 }
1568
1569 if (use_oif_addr) {
1570 if (idev)
1571 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1572 } else {
1573 for_each_netdev_rcu(net, dev) {
1574 idev = __in6_dev_get(dev);
1575 if (!idev)
1576 continue;
1577 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1578 }
1579 }
1580 rcu_read_unlock();
1581
1582 hiscore = &scores[hiscore_idx];
1583 if (!hiscore->ifa)
1584 return -EADDRNOTAVAIL;
1585
1586 *saddr = hiscore->ifa->addr;
1587 in6_ifa_put(hiscore->ifa);
1588 return 0;
1589}
1590EXPORT_SYMBOL(ipv6_dev_get_saddr);
1591
1592int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1593 u32 banned_flags)
1594{
1595 struct inet6_ifaddr *ifp;
1596 int err = -EADDRNOTAVAIL;
1597
1598 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1599 if (ifp->scope > IFA_LINK)
1600 break;
1601 if (ifp->scope == IFA_LINK &&
1602 !(ifp->flags & banned_flags)) {
1603 *addr = ifp->addr;
1604 err = 0;
1605 break;
1606 }
1607 }
1608 return err;
1609}
1610
1611int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1612 u32 banned_flags)
1613{
1614 struct inet6_dev *idev;
1615 int err = -EADDRNOTAVAIL;
1616
1617 rcu_read_lock();
1618 idev = __in6_dev_get(dev);
1619 if (idev) {
1620 read_lock_bh(&idev->lock);
1621 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1622 read_unlock_bh(&idev->lock);
1623 }
1624 rcu_read_unlock();
1625 return err;
1626}
1627
1628static int ipv6_count_addresses(struct inet6_dev *idev)
1629{
1630 int cnt = 0;
1631 struct inet6_ifaddr *ifp;
1632
1633 read_lock_bh(&idev->lock);
1634 list_for_each_entry(ifp, &idev->addr_list, if_list)
1635 cnt++;
1636 read_unlock_bh(&idev->lock);
1637 return cnt;
1638}
1639
1640int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1641 const struct net_device *dev, int strict)
1642{
1643 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1644}
1645EXPORT_SYMBOL(ipv6_chk_addr);
1646
1647int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1648 const struct net_device *dev, int strict,
1649 u32 banned_flags)
1650{
1651 struct inet6_ifaddr *ifp;
1652 unsigned int hash = inet6_addr_hash(addr);
1653 u32 ifp_flags;
1654
1655 rcu_read_lock_bh();
1656 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1657 if (!net_eq(dev_net(ifp->idev->dev), net))
1658 continue;
1659 /* Decouple optimistic from tentative for evaluation here.
1660 * Ban optimistic addresses explicitly, when required.
1661 */
1662 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1663 ? (ifp->flags&~IFA_F_TENTATIVE)
1664 : ifp->flags;
1665 if (ipv6_addr_equal(&ifp->addr, addr) &&
1666 !(ifp_flags&banned_flags) &&
1667 (!dev || ifp->idev->dev == dev ||
1668 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1669 rcu_read_unlock_bh();
1670 return 1;
1671 }
1672 }
1673
1674 rcu_read_unlock_bh();
1675 return 0;
1676}
1677EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1678
1679static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1680 struct net_device *dev)
1681{
1682 unsigned int hash = inet6_addr_hash(addr);
1683 struct inet6_ifaddr *ifp;
1684
1685 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1686 if (!net_eq(dev_net(ifp->idev->dev), net))
1687 continue;
1688 if (ipv6_addr_equal(&ifp->addr, addr)) {
1689 if (!dev || ifp->idev->dev == dev)
1690 return true;
1691 }
1692 }
1693 return false;
1694}
1695
1696/* Compares an address/prefix_len with addresses on device @dev.
1697 * If one is found it returns true.
1698 */
1699bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1700 const unsigned int prefix_len, struct net_device *dev)
1701{
1702 struct inet6_dev *idev;
1703 struct inet6_ifaddr *ifa;
1704 bool ret = false;
1705
1706 rcu_read_lock();
1707 idev = __in6_dev_get(dev);
1708 if (idev) {
1709 read_lock_bh(&idev->lock);
1710 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1711 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1712 if (ret)
1713 break;
1714 }
1715 read_unlock_bh(&idev->lock);
1716 }
1717 rcu_read_unlock();
1718
1719 return ret;
1720}
1721EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1722
1723int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1724{
1725 struct inet6_dev *idev;
1726 struct inet6_ifaddr *ifa;
1727 int onlink;
1728
1729 onlink = 0;
1730 rcu_read_lock();
1731 idev = __in6_dev_get(dev);
1732 if (idev) {
1733 read_lock_bh(&idev->lock);
1734 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1735 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1736 ifa->prefix_len);
1737 if (onlink)
1738 break;
1739 }
1740 read_unlock_bh(&idev->lock);
1741 }
1742 rcu_read_unlock();
1743 return onlink;
1744}
1745EXPORT_SYMBOL(ipv6_chk_prefix);
1746
1747struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1748 struct net_device *dev, int strict)
1749{
1750 struct inet6_ifaddr *ifp, *result = NULL;
1751 unsigned int hash = inet6_addr_hash(addr);
1752
1753 rcu_read_lock_bh();
1754 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1755 if (!net_eq(dev_net(ifp->idev->dev), net))
1756 continue;
1757 if (ipv6_addr_equal(&ifp->addr, addr)) {
1758 if (!dev || ifp->idev->dev == dev ||
1759 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1760 result = ifp;
1761 in6_ifa_hold(ifp);
1762 break;
1763 }
1764 }
1765 }
1766 rcu_read_unlock_bh();
1767
1768 return result;
1769}
1770
1771/* Gets referenced address, destroys ifaddr */
1772
1773static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1774{
1775 if (ifp->flags&IFA_F_TEMPORARY) {
1776 struct inet6_ifaddr *ifpub;
1777 spin_lock_bh(&ifp->lock);
1778 ifpub = ifp->ifpub;
1779 if (ifpub) {
1780 in6_ifa_hold(ifpub);
1781 spin_unlock_bh(&ifp->lock);
1782 ipv6_create_tempaddr(ifpub, ifp);
1783 in6_ifa_put(ifpub);
1784 } else {
1785 spin_unlock_bh(&ifp->lock);
1786 }
1787 ipv6_del_addr(ifp);
1788 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
1789 spin_lock_bh(&ifp->lock);
1790 addrconf_del_dad_work(ifp);
1791 ifp->flags |= IFA_F_TENTATIVE;
1792 if (dad_failed)
1793 ifp->flags |= IFA_F_DADFAILED;
1794 spin_unlock_bh(&ifp->lock);
1795 if (dad_failed)
1796 ipv6_ifa_notify(0, ifp);
1797 in6_ifa_put(ifp);
1798 } else {
1799 ipv6_del_addr(ifp);
1800 }
1801}
1802
1803static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1804{
1805 int err = -ENOENT;
1806
1807 spin_lock_bh(&ifp->lock);
1808 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1809 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1810 err = 0;
1811 }
1812 spin_unlock_bh(&ifp->lock);
1813
1814 return err;
1815}
1816
1817void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1818{
1819 struct in6_addr addr;
1820 struct inet6_dev *idev = ifp->idev;
1821 struct net *net = dev_net(ifp->idev->dev);
1822
1823 if (addrconf_dad_end(ifp)) {
1824 in6_ifa_put(ifp);
1825 return;
1826 }
1827
1828 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1829 ifp->idev->dev->name, &ifp->addr);
1830
1831 spin_lock_bh(&ifp->lock);
1832
1833 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1834 int scope = ifp->scope;
1835 u32 flags = ifp->flags;
1836 struct in6_addr new_addr;
1837 struct inet6_ifaddr *ifp2;
1838 u32 valid_lft, preferred_lft;
1839 int pfxlen = ifp->prefix_len;
1840 int retries = ifp->stable_privacy_retry + 1;
1841
1842 if (retries > net->ipv6.sysctl.idgen_retries) {
1843 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1844 ifp->idev->dev->name);
1845 goto errdad;
1846 }
1847
1848 new_addr = ifp->addr;
1849 if (ipv6_generate_stable_address(&new_addr, retries,
1850 idev))
1851 goto errdad;
1852
1853 valid_lft = ifp->valid_lft;
1854 preferred_lft = ifp->prefered_lft;
1855
1856 spin_unlock_bh(&ifp->lock);
1857
1858 if (idev->cnf.max_addresses &&
1859 ipv6_count_addresses(idev) >=
1860 idev->cnf.max_addresses)
1861 goto lock_errdad;
1862
1863 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1864 ifp->idev->dev->name);
1865
1866 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1867 scope, flags, valid_lft,
1868 preferred_lft);
1869 if (IS_ERR(ifp2))
1870 goto lock_errdad;
1871
1872 spin_lock_bh(&ifp2->lock);
1873 ifp2->stable_privacy_retry = retries;
1874 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1875 spin_unlock_bh(&ifp2->lock);
1876
1877 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1878 in6_ifa_put(ifp2);
1879lock_errdad:
1880 spin_lock_bh(&ifp->lock);
1881 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1882 addr.s6_addr32[0] = htonl(0xfe800000);
1883 addr.s6_addr32[1] = 0;
1884
1885 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1886 ipv6_addr_equal(&ifp->addr, &addr)) {
1887 /* DAD failed for link-local based on MAC address */
1888 idev->cnf.disable_ipv6 = 1;
1889
1890 pr_info("%s: IPv6 being disabled!\n",
1891 ifp->idev->dev->name);
1892 }
1893 }
1894
1895errdad:
1896 /* transition from _POSTDAD to _ERRDAD */
1897 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1898 spin_unlock_bh(&ifp->lock);
1899
1900 addrconf_mod_dad_work(ifp, 0);
1901 in6_ifa_put(ifp);
1902}
1903
1904/* Join to solicited addr multicast group.
1905 * caller must hold RTNL */
1906void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1907{
1908 struct in6_addr maddr;
1909
1910 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1911 return;
1912
1913 addrconf_addr_solict_mult(addr, &maddr);
1914 ipv6_dev_mc_inc(dev, &maddr);
1915}
1916
1917/* caller must hold RTNL */
1918void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1919{
1920 struct in6_addr maddr;
1921
1922 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1923 return;
1924
1925 addrconf_addr_solict_mult(addr, &maddr);
1926 __ipv6_dev_mc_dec(idev, &maddr);
1927}
1928
1929/* caller must hold RTNL */
1930static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1931{
1932 struct in6_addr addr;
1933
1934 if (ifp->prefix_len >= 127) /* RFC 6164 */
1935 return;
1936 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1937 if (ipv6_addr_any(&addr))
1938 return;
1939 __ipv6_dev_ac_inc(ifp->idev, &addr);
1940}
1941
1942/* caller must hold RTNL */
1943static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1944{
1945 struct in6_addr addr;
1946
1947 if (ifp->prefix_len >= 127) /* RFC 6164 */
1948 return;
1949 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1950 if (ipv6_addr_any(&addr))
1951 return;
1952 __ipv6_dev_ac_dec(ifp->idev, &addr);
1953}
1954
1955static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1956{
1957 if (dev->addr_len != IEEE802154_ADDR_LEN)
1958 return -1;
1959 memcpy(eui, dev->dev_addr, 8);
1960 eui[0] ^= 2;
1961 return 0;
1962}
1963
1964static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1965{
1966 union fwnet_hwaddr *ha;
1967
1968 if (dev->addr_len != FWNET_ALEN)
1969 return -1;
1970
1971 ha = (union fwnet_hwaddr *)dev->dev_addr;
1972
1973 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1974 eui[0] ^= 2;
1975 return 0;
1976}
1977
1978static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1979{
1980 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1981 if (dev->addr_len != ARCNET_ALEN)
1982 return -1;
1983 memset(eui, 0, 7);
1984 eui[7] = *(u8 *)dev->dev_addr;
1985 return 0;
1986}
1987
1988static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1989{
1990 if (dev->addr_len != INFINIBAND_ALEN)
1991 return -1;
1992 memcpy(eui, dev->dev_addr + 12, 8);
1993 eui[0] |= 2;
1994 return 0;
1995}
1996
1997static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
1998{
1999 if (addr == 0)
2000 return -1;
2001 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2002 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2003 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2004 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2005 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2006 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2007 eui[1] = 0;
2008 eui[2] = 0x5E;
2009 eui[3] = 0xFE;
2010 memcpy(eui + 4, &addr, 4);
2011 return 0;
2012}
2013
2014static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2015{
2016 if (dev->priv_flags & IFF_ISATAP)
2017 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2018 return -1;
2019}
2020
2021static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2022{
2023 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2024}
2025
2026static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2027{
2028 memcpy(eui, dev->perm_addr, 3);
2029 memcpy(eui + 5, dev->perm_addr + 3, 3);
2030 eui[3] = 0xFF;
2031 eui[4] = 0xFE;
2032 eui[0] ^= 2;
2033 return 0;
2034}
2035
2036static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2037{
2038 switch (dev->type) {
2039 case ARPHRD_ETHER:
2040 case ARPHRD_FDDI:
2041 return addrconf_ifid_eui48(eui, dev);
2042 case ARPHRD_ARCNET:
2043 return addrconf_ifid_arcnet(eui, dev);
2044 case ARPHRD_INFINIBAND:
2045 return addrconf_ifid_infiniband(eui, dev);
2046 case ARPHRD_SIT:
2047 return addrconf_ifid_sit(eui, dev);
2048 case ARPHRD_IPGRE:
2049 return addrconf_ifid_gre(eui, dev);
2050 case ARPHRD_6LOWPAN:
2051 case ARPHRD_IEEE802154:
2052 return addrconf_ifid_eui64(eui, dev);
2053 case ARPHRD_IEEE1394:
2054 return addrconf_ifid_ieee1394(eui, dev);
2055 case ARPHRD_TUNNEL6:
2056 return addrconf_ifid_ip6tnl(eui, dev);
2057 }
2058 return -1;
2059}
2060
2061static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2062{
2063 int err = -1;
2064 struct inet6_ifaddr *ifp;
2065
2066 read_lock_bh(&idev->lock);
2067 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2068 if (ifp->scope > IFA_LINK)
2069 break;
2070 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2071 memcpy(eui, ifp->addr.s6_addr+8, 8);
2072 err = 0;
2073 break;
2074 }
2075 }
2076 read_unlock_bh(&idev->lock);
2077 return err;
2078}
2079
2080/* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2081static void __ipv6_regen_rndid(struct inet6_dev *idev)
2082{
2083regen:
2084 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2085 idev->rndid[0] &= ~0x02;
2086
2087 /*
2088 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2089 * check if generated address is not inappropriate
2090 *
2091 * - Reserved subnet anycast (RFC 2526)
2092 * 11111101 11....11 1xxxxxxx
2093 * - ISATAP (RFC4214) 6.1
2094 * 00-00-5E-FE-xx-xx-xx-xx
2095 * - value 0
2096 * - XXX: already assigned to an address on the device
2097 */
2098 if (idev->rndid[0] == 0xfd &&
2099 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2100 (idev->rndid[7]&0x80))
2101 goto regen;
2102 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2103 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2104 goto regen;
2105 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2106 goto regen;
2107 }
2108}
2109
2110static void ipv6_regen_rndid(unsigned long data)
2111{
2112 struct inet6_dev *idev = (struct inet6_dev *) data;
2113 unsigned long expires;
2114
2115 rcu_read_lock_bh();
2116 write_lock_bh(&idev->lock);
2117
2118 if (idev->dead)
2119 goto out;
2120
2121 __ipv6_regen_rndid(idev);
2122
2123 expires = jiffies +
2124 idev->cnf.temp_prefered_lft * HZ -
2125 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2126 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2127 idev->cnf.max_desync_factor * HZ;
2128 if (time_before(expires, jiffies)) {
2129 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2130 __func__, idev->dev->name);
2131 goto out;
2132 }
2133
2134 if (!mod_timer(&idev->regen_timer, expires))
2135 in6_dev_hold(idev);
2136
2137out:
2138 write_unlock_bh(&idev->lock);
2139 rcu_read_unlock_bh();
2140 in6_dev_put(idev);
2141}
2142
2143static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2144{
2145 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2146 __ipv6_regen_rndid(idev);
2147}
2148
2149/*
2150 * Add prefix route.
2151 */
2152
2153static void
2154addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2155 unsigned long expires, u32 flags)
2156{
2157 struct fib6_config cfg = {
2158 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2159 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2160 .fc_ifindex = dev->ifindex,
2161 .fc_expires = expires,
2162 .fc_dst_len = plen,
2163 .fc_flags = RTF_UP | flags,
2164 .fc_nlinfo.nl_net = dev_net(dev),
2165 .fc_protocol = RTPROT_KERNEL,
2166 };
2167
2168 cfg.fc_dst = *pfx;
2169
2170 /* Prevent useless cloning on PtP SIT.
2171 This thing is done here expecting that the whole
2172 class of non-broadcast devices need not cloning.
2173 */
2174#if IS_ENABLED(CONFIG_IPV6_SIT)
2175 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2176 cfg.fc_flags |= RTF_NONEXTHOP;
2177#endif
2178
2179 ip6_route_add(&cfg);
2180}
2181
2182
2183static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2184 int plen,
2185 const struct net_device *dev,
2186 u32 flags, u32 noflags)
2187{
2188 struct fib6_node *fn;
2189 struct rt6_info *rt = NULL;
2190 struct fib6_table *table;
2191 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2192
2193 table = fib6_get_table(dev_net(dev), tb_id);
2194 if (!table)
2195 return NULL;
2196
2197 read_lock_bh(&table->tb6_lock);
2198 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2199 if (!fn)
2200 goto out;
2201
2202 noflags |= RTF_CACHE;
2203 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2204 if (rt->dst.dev->ifindex != dev->ifindex)
2205 continue;
2206 if ((rt->rt6i_flags & flags) != flags)
2207 continue;
2208 if ((rt->rt6i_flags & noflags) != 0)
2209 continue;
2210 dst_hold(&rt->dst);
2211 break;
2212 }
2213out:
2214 read_unlock_bh(&table->tb6_lock);
2215 return rt;
2216}
2217
2218
2219/* Create "default" multicast route to the interface */
2220
2221static void addrconf_add_mroute(struct net_device *dev)
2222{
2223 struct fib6_config cfg = {
2224 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2225 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2226 .fc_ifindex = dev->ifindex,
2227 .fc_dst_len = 8,
2228 .fc_flags = RTF_UP,
2229 .fc_nlinfo.nl_net = dev_net(dev),
2230 };
2231
2232 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2233
2234 ip6_route_add(&cfg);
2235}
2236
2237static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2238{
2239 struct inet6_dev *idev;
2240
2241 ASSERT_RTNL();
2242
2243 idev = ipv6_find_idev(dev);
2244 if (!idev)
2245 return ERR_PTR(-ENOBUFS);
2246
2247 if (idev->cnf.disable_ipv6)
2248 return ERR_PTR(-EACCES);
2249
2250 /* Add default multicast route */
2251 if (!(dev->flags & IFF_LOOPBACK))
2252 addrconf_add_mroute(dev);
2253
2254 return idev;
2255}
2256
2257static void manage_tempaddrs(struct inet6_dev *idev,
2258 struct inet6_ifaddr *ifp,
2259 __u32 valid_lft, __u32 prefered_lft,
2260 bool create, unsigned long now)
2261{
2262 u32 flags;
2263 struct inet6_ifaddr *ift;
2264
2265 read_lock_bh(&idev->lock);
2266 /* update all temporary addresses in the list */
2267 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2268 int age, max_valid, max_prefered;
2269
2270 if (ifp != ift->ifpub)
2271 continue;
2272
2273 /* RFC 4941 section 3.3:
2274 * If a received option will extend the lifetime of a public
2275 * address, the lifetimes of temporary addresses should
2276 * be extended, subject to the overall constraint that no
2277 * temporary addresses should ever remain "valid" or "preferred"
2278 * for a time longer than (TEMP_VALID_LIFETIME) or
2279 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2280 */
2281 age = (now - ift->cstamp) / HZ;
2282 max_valid = idev->cnf.temp_valid_lft - age;
2283 if (max_valid < 0)
2284 max_valid = 0;
2285
2286 max_prefered = idev->cnf.temp_prefered_lft -
2287 idev->cnf.max_desync_factor - age;
2288 if (max_prefered < 0)
2289 max_prefered = 0;
2290
2291 if (valid_lft > max_valid)
2292 valid_lft = max_valid;
2293
2294 if (prefered_lft > max_prefered)
2295 prefered_lft = max_prefered;
2296
2297 spin_lock(&ift->lock);
2298 flags = ift->flags;
2299 ift->valid_lft = valid_lft;
2300 ift->prefered_lft = prefered_lft;
2301 ift->tstamp = now;
2302 if (prefered_lft > 0)
2303 ift->flags &= ~IFA_F_DEPRECATED;
2304
2305 spin_unlock(&ift->lock);
2306 if (!(flags&IFA_F_TENTATIVE))
2307 ipv6_ifa_notify(0, ift);
2308 }
2309
2310 if ((create || list_empty(&idev->tempaddr_list)) &&
2311 idev->cnf.use_tempaddr > 0) {
2312 /* When a new public address is created as described
2313 * in [ADDRCONF], also create a new temporary address.
2314 * Also create a temporary address if it's enabled but
2315 * no temporary address currently exists.
2316 */
2317 read_unlock_bh(&idev->lock);
2318 ipv6_create_tempaddr(ifp, NULL);
2319 } else {
2320 read_unlock_bh(&idev->lock);
2321 }
2322}
2323
2324void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2325{
2326 struct prefix_info *pinfo;
2327 __u32 valid_lft;
2328 __u32 prefered_lft;
2329 int addr_type;
2330 u32 addr_flags = 0;
2331 struct inet6_dev *in6_dev;
2332 struct net *net = dev_net(dev);
2333
2334 pinfo = (struct prefix_info *) opt;
2335
2336 if (len < sizeof(struct prefix_info)) {
2337 ADBG("addrconf: prefix option too short\n");
2338 return;
2339 }
2340
2341 /*
2342 * Validation checks ([ADDRCONF], page 19)
2343 */
2344
2345 addr_type = ipv6_addr_type(&pinfo->prefix);
2346
2347 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2348 return;
2349
2350 valid_lft = ntohl(pinfo->valid);
2351 prefered_lft = ntohl(pinfo->prefered);
2352
2353 if (prefered_lft > valid_lft) {
2354 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2355 return;
2356 }
2357
2358 in6_dev = in6_dev_get(dev);
2359
2360 if (!in6_dev) {
2361 net_dbg_ratelimited("addrconf: device %s not configured\n",
2362 dev->name);
2363 return;
2364 }
2365
2366 /*
2367 * Two things going on here:
2368 * 1) Add routes for on-link prefixes
2369 * 2) Configure prefixes with the auto flag set
2370 */
2371
2372 if (pinfo->onlink) {
2373 struct rt6_info *rt;
2374 unsigned long rt_expires;
2375
2376 /* Avoid arithmetic overflow. Really, we could
2377 * save rt_expires in seconds, likely valid_lft,
2378 * but it would require division in fib gc, that it
2379 * not good.
2380 */
2381 if (HZ > USER_HZ)
2382 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2383 else
2384 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2385
2386 if (addrconf_finite_timeout(rt_expires))
2387 rt_expires *= HZ;
2388
2389 rt = addrconf_get_prefix_route(&pinfo->prefix,
2390 pinfo->prefix_len,
2391 dev,
2392 RTF_ADDRCONF | RTF_PREFIX_RT,
2393 RTF_GATEWAY | RTF_DEFAULT);
2394
2395 if (rt) {
2396 /* Autoconf prefix route */
2397 if (valid_lft == 0) {
2398 ip6_del_rt(rt);
2399 rt = NULL;
2400 } else if (addrconf_finite_timeout(rt_expires)) {
2401 /* not infinity */
2402 rt6_set_expires(rt, jiffies + rt_expires);
2403 } else {
2404 rt6_clean_expires(rt);
2405 }
2406 } else if (valid_lft) {
2407 clock_t expires = 0;
2408 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2409 if (addrconf_finite_timeout(rt_expires)) {
2410 /* not infinity */
2411 flags |= RTF_EXPIRES;
2412 expires = jiffies_to_clock_t(rt_expires);
2413 }
2414 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2415 dev, expires, flags);
2416 }
2417 ip6_rt_put(rt);
2418 }
2419
2420 /* Try to figure out our local address for this prefix */
2421
2422 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2423 struct inet6_ifaddr *ifp;
2424 struct in6_addr addr;
2425 int create = 0, update_lft = 0;
2426 bool tokenized = false;
2427
2428 if (pinfo->prefix_len == 64) {
2429 memcpy(&addr, &pinfo->prefix, 8);
2430
2431 if (!ipv6_addr_any(&in6_dev->token)) {
2432 read_lock_bh(&in6_dev->lock);
2433 memcpy(addr.s6_addr + 8,
2434 in6_dev->token.s6_addr + 8, 8);
2435 read_unlock_bh(&in6_dev->lock);
2436 tokenized = true;
2437 } else if (in6_dev->addr_gen_mode ==
2438 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2439 !ipv6_generate_stable_address(&addr, 0,
2440 in6_dev)) {
2441 addr_flags |= IFA_F_STABLE_PRIVACY;
2442 goto ok;
2443 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2444 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2445 in6_dev_put(in6_dev);
2446 return;
2447 }
2448 goto ok;
2449 }
2450 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2451 pinfo->prefix_len);
2452 in6_dev_put(in6_dev);
2453 return;
2454
2455ok:
2456
2457 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2458
2459 if (!ifp && valid_lft) {
2460 int max_addresses = in6_dev->cnf.max_addresses;
2461
2462#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2463 if (in6_dev->cnf.optimistic_dad &&
2464 !net->ipv6.devconf_all->forwarding && sllao)
2465 addr_flags |= IFA_F_OPTIMISTIC;
2466#endif
2467
2468 /* Do not allow to create too much of autoconfigured
2469 * addresses; this would be too easy way to crash kernel.
2470 */
2471 if (!max_addresses ||
2472 ipv6_count_addresses(in6_dev) < max_addresses)
2473 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2474 pinfo->prefix_len,
2475 addr_type&IPV6_ADDR_SCOPE_MASK,
2476 addr_flags, valid_lft,
2477 prefered_lft);
2478
2479 if (IS_ERR_OR_NULL(ifp)) {
2480 in6_dev_put(in6_dev);
2481 return;
2482 }
2483
2484 update_lft = 0;
2485 create = 1;
2486 spin_lock_bh(&ifp->lock);
2487 ifp->flags |= IFA_F_MANAGETEMPADDR;
2488 ifp->cstamp = jiffies;
2489 ifp->tokenized = tokenized;
2490 spin_unlock_bh(&ifp->lock);
2491 addrconf_dad_start(ifp);
2492 }
2493
2494 if (ifp) {
2495 u32 flags;
2496 unsigned long now;
2497 u32 stored_lft;
2498
2499 /* update lifetime (RFC2462 5.5.3 e) */
2500 spin_lock_bh(&ifp->lock);
2501 now = jiffies;
2502 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2503 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2504 else
2505 stored_lft = 0;
2506 if (!update_lft && !create && stored_lft) {
2507 const u32 minimum_lft = min_t(u32,
2508 stored_lft, MIN_VALID_LIFETIME);
2509 valid_lft = max(valid_lft, minimum_lft);
2510
2511 /* RFC4862 Section 5.5.3e:
2512 * "Note that the preferred lifetime of the
2513 * corresponding address is always reset to
2514 * the Preferred Lifetime in the received
2515 * Prefix Information option, regardless of
2516 * whether the valid lifetime is also reset or
2517 * ignored."
2518 *
2519 * So we should always update prefered_lft here.
2520 */
2521 update_lft = 1;
2522 }
2523
2524 if (update_lft) {
2525 ifp->valid_lft = valid_lft;
2526 ifp->prefered_lft = prefered_lft;
2527 ifp->tstamp = now;
2528 flags = ifp->flags;
2529 ifp->flags &= ~IFA_F_DEPRECATED;
2530 spin_unlock_bh(&ifp->lock);
2531
2532 if (!(flags&IFA_F_TENTATIVE))
2533 ipv6_ifa_notify(0, ifp);
2534 } else
2535 spin_unlock_bh(&ifp->lock);
2536
2537 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2538 create, now);
2539
2540 in6_ifa_put(ifp);
2541 addrconf_verify();
2542 }
2543 }
2544 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2545 in6_dev_put(in6_dev);
2546}
2547
2548/*
2549 * Set destination address.
2550 * Special case for SIT interfaces where we create a new "virtual"
2551 * device.
2552 */
2553int addrconf_set_dstaddr(struct net *net, void __user *arg)
2554{
2555 struct in6_ifreq ireq;
2556 struct net_device *dev;
2557 int err = -EINVAL;
2558
2559 rtnl_lock();
2560
2561 err = -EFAULT;
2562 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2563 goto err_exit;
2564
2565 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2566
2567 err = -ENODEV;
2568 if (!dev)
2569 goto err_exit;
2570
2571#if IS_ENABLED(CONFIG_IPV6_SIT)
2572 if (dev->type == ARPHRD_SIT) {
2573 const struct net_device_ops *ops = dev->netdev_ops;
2574 struct ifreq ifr;
2575 struct ip_tunnel_parm p;
2576
2577 err = -EADDRNOTAVAIL;
2578 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2579 goto err_exit;
2580
2581 memset(&p, 0, sizeof(p));
2582 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2583 p.iph.saddr = 0;
2584 p.iph.version = 4;
2585 p.iph.ihl = 5;
2586 p.iph.protocol = IPPROTO_IPV6;
2587 p.iph.ttl = 64;
2588 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2589
2590 if (ops->ndo_do_ioctl) {
2591 mm_segment_t oldfs = get_fs();
2592
2593 set_fs(KERNEL_DS);
2594 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2595 set_fs(oldfs);
2596 } else
2597 err = -EOPNOTSUPP;
2598
2599 if (err == 0) {
2600 err = -ENOBUFS;
2601 dev = __dev_get_by_name(net, p.name);
2602 if (!dev)
2603 goto err_exit;
2604 err = dev_open(dev);
2605 }
2606 }
2607#endif
2608
2609err_exit:
2610 rtnl_unlock();
2611 return err;
2612}
2613
2614static int ipv6_mc_config(struct sock *sk, bool join,
2615 const struct in6_addr *addr, int ifindex)
2616{
2617 int ret;
2618
2619 ASSERT_RTNL();
2620
2621 lock_sock(sk);
2622 if (join)
2623 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2624 else
2625 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2626 release_sock(sk);
2627
2628 return ret;
2629}
2630
2631/*
2632 * Manual configuration of address on an interface
2633 */
2634static int inet6_addr_add(struct net *net, int ifindex,
2635 const struct in6_addr *pfx,
2636 const struct in6_addr *peer_pfx,
2637 unsigned int plen, __u32 ifa_flags,
2638 __u32 prefered_lft, __u32 valid_lft)
2639{
2640 struct inet6_ifaddr *ifp;
2641 struct inet6_dev *idev;
2642 struct net_device *dev;
2643 unsigned long timeout;
2644 clock_t expires;
2645 int scope;
2646 u32 flags;
2647
2648 ASSERT_RTNL();
2649
2650 if (plen > 128)
2651 return -EINVAL;
2652
2653 /* check the lifetime */
2654 if (!valid_lft || prefered_lft > valid_lft)
2655 return -EINVAL;
2656
2657 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2658 return -EINVAL;
2659
2660 dev = __dev_get_by_index(net, ifindex);
2661 if (!dev)
2662 return -ENODEV;
2663
2664 idev = addrconf_add_dev(dev);
2665 if (IS_ERR(idev))
2666 return PTR_ERR(idev);
2667
2668 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2669 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2670 true, pfx, ifindex);
2671
2672 if (ret < 0)
2673 return ret;
2674 }
2675
2676 scope = ipv6_addr_scope(pfx);
2677
2678 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2679 if (addrconf_finite_timeout(timeout)) {
2680 expires = jiffies_to_clock_t(timeout * HZ);
2681 valid_lft = timeout;
2682 flags = RTF_EXPIRES;
2683 } else {
2684 expires = 0;
2685 flags = 0;
2686 ifa_flags |= IFA_F_PERMANENT;
2687 }
2688
2689 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2690 if (addrconf_finite_timeout(timeout)) {
2691 if (timeout == 0)
2692 ifa_flags |= IFA_F_DEPRECATED;
2693 prefered_lft = timeout;
2694 }
2695
2696 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2697 valid_lft, prefered_lft);
2698
2699 if (!IS_ERR(ifp)) {
2700 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2701 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2702 expires, flags);
2703 }
2704
2705 /*
2706 * Note that section 3.1 of RFC 4429 indicates
2707 * that the Optimistic flag should not be set for
2708 * manually configured addresses
2709 */
2710 addrconf_dad_start(ifp);
2711 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2712 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2713 true, jiffies);
2714 in6_ifa_put(ifp);
2715 addrconf_verify_rtnl();
2716 return 0;
2717 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2718 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2719 false, pfx, ifindex);
2720 }
2721
2722 return PTR_ERR(ifp);
2723}
2724
2725static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2726 const struct in6_addr *pfx, unsigned int plen)
2727{
2728 struct inet6_ifaddr *ifp;
2729 struct inet6_dev *idev;
2730 struct net_device *dev;
2731
2732 if (plen > 128)
2733 return -EINVAL;
2734
2735 dev = __dev_get_by_index(net, ifindex);
2736 if (!dev)
2737 return -ENODEV;
2738
2739 idev = __in6_dev_get(dev);
2740 if (!idev)
2741 return -ENXIO;
2742
2743 read_lock_bh(&idev->lock);
2744 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2745 if (ifp->prefix_len == plen &&
2746 ipv6_addr_equal(pfx, &ifp->addr)) {
2747 in6_ifa_hold(ifp);
2748 read_unlock_bh(&idev->lock);
2749
2750 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2751 (ifa_flags & IFA_F_MANAGETEMPADDR))
2752 manage_tempaddrs(idev, ifp, 0, 0, false,
2753 jiffies);
2754 ipv6_del_addr(ifp);
2755 addrconf_verify_rtnl();
2756 if (ipv6_addr_is_multicast(pfx)) {
2757 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2758 false, pfx, dev->ifindex);
2759 }
2760 return 0;
2761 }
2762 }
2763 read_unlock_bh(&idev->lock);
2764 return -EADDRNOTAVAIL;
2765}
2766
2767
2768int addrconf_add_ifaddr(struct net *net, void __user *arg)
2769{
2770 struct in6_ifreq ireq;
2771 int err;
2772
2773 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2774 return -EPERM;
2775
2776 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2777 return -EFAULT;
2778
2779 rtnl_lock();
2780 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2781 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2782 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2783 rtnl_unlock();
2784 return err;
2785}
2786
2787int addrconf_del_ifaddr(struct net *net, void __user *arg)
2788{
2789 struct in6_ifreq ireq;
2790 int err;
2791
2792 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2793 return -EPERM;
2794
2795 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2796 return -EFAULT;
2797
2798 rtnl_lock();
2799 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2800 ireq.ifr6_prefixlen);
2801 rtnl_unlock();
2802 return err;
2803}
2804
2805static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2806 int plen, int scope)
2807{
2808 struct inet6_ifaddr *ifp;
2809
2810 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2811 scope, IFA_F_PERMANENT,
2812 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2813 if (!IS_ERR(ifp)) {
2814 spin_lock_bh(&ifp->lock);
2815 ifp->flags &= ~IFA_F_TENTATIVE;
2816 spin_unlock_bh(&ifp->lock);
2817 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2818 in6_ifa_put(ifp);
2819 }
2820}
2821
2822#if IS_ENABLED(CONFIG_IPV6_SIT)
2823static void sit_add_v4_addrs(struct inet6_dev *idev)
2824{
2825 struct in6_addr addr;
2826 struct net_device *dev;
2827 struct net *net = dev_net(idev->dev);
2828 int scope, plen;
2829 u32 pflags = 0;
2830
2831 ASSERT_RTNL();
2832
2833 memset(&addr, 0, sizeof(struct in6_addr));
2834 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2835
2836 if (idev->dev->flags&IFF_POINTOPOINT) {
2837 addr.s6_addr32[0] = htonl(0xfe800000);
2838 scope = IFA_LINK;
2839 plen = 64;
2840 } else {
2841 scope = IPV6_ADDR_COMPATv4;
2842 plen = 96;
2843 pflags |= RTF_NONEXTHOP;
2844 }
2845
2846 if (addr.s6_addr32[3]) {
2847 add_addr(idev, &addr, plen, scope);
2848 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2849 return;
2850 }
2851
2852 for_each_netdev(net, dev) {
2853 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2854 if (in_dev && (dev->flags & IFF_UP)) {
2855 struct in_ifaddr *ifa;
2856
2857 int flag = scope;
2858
2859 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2860
2861 addr.s6_addr32[3] = ifa->ifa_local;
2862
2863 if (ifa->ifa_scope == RT_SCOPE_LINK)
2864 continue;
2865 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2866 if (idev->dev->flags&IFF_POINTOPOINT)
2867 continue;
2868 flag |= IFA_HOST;
2869 }
2870
2871 add_addr(idev, &addr, plen, flag);
2872 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2873 pflags);
2874 }
2875 }
2876 }
2877}
2878#endif
2879
2880static void init_loopback(struct net_device *dev)
2881{
2882 struct inet6_dev *idev;
2883 struct net_device *sp_dev;
2884 struct inet6_ifaddr *sp_ifa;
2885 struct rt6_info *sp_rt;
2886
2887 /* ::1 */
2888
2889 ASSERT_RTNL();
2890
2891 idev = ipv6_find_idev(dev);
2892 if (!idev) {
2893 pr_debug("%s: add_dev failed\n", __func__);
2894 return;
2895 }
2896
2897 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2898
2899 /* Add routes to other interface's IPv6 addresses */
2900 for_each_netdev(dev_net(dev), sp_dev) {
2901 if (!strcmp(sp_dev->name, dev->name))
2902 continue;
2903
2904 idev = __in6_dev_get(sp_dev);
2905 if (!idev)
2906 continue;
2907
2908 read_lock_bh(&idev->lock);
2909 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2910
2911 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2912 continue;
2913
2914 if (sp_ifa->rt) {
2915 /* This dst has been added to garbage list when
2916 * lo device down, release this obsolete dst and
2917 * reallocate a new router for ifa.
2918 */
2919 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
2920 ip6_rt_put(sp_ifa->rt);
2921 sp_ifa->rt = NULL;
2922 } else {
2923 continue;
2924 }
2925 }
2926
2927 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2928
2929 /* Failure cases are ignored */
2930 if (!IS_ERR(sp_rt)) {
2931 sp_ifa->rt = sp_rt;
2932 ip6_ins_rt(sp_rt);
2933 }
2934 }
2935 read_unlock_bh(&idev->lock);
2936 }
2937}
2938
2939static void addrconf_add_linklocal(struct inet6_dev *idev,
2940 const struct in6_addr *addr, u32 flags)
2941{
2942 struct inet6_ifaddr *ifp;
2943 u32 addr_flags = flags | IFA_F_PERMANENT;
2944
2945#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2946 if (idev->cnf.optimistic_dad &&
2947 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2948 addr_flags |= IFA_F_OPTIMISTIC;
2949#endif
2950
2951 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2952 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2953 if (!IS_ERR(ifp)) {
2954 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2955 addrconf_dad_start(ifp);
2956 in6_ifa_put(ifp);
2957 }
2958}
2959
2960static bool ipv6_reserved_interfaceid(struct in6_addr address)
2961{
2962 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2963 return true;
2964
2965 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2966 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2967 return true;
2968
2969 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2970 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2971 return true;
2972
2973 return false;
2974}
2975
2976static int ipv6_generate_stable_address(struct in6_addr *address,
2977 u8 dad_count,
2978 const struct inet6_dev *idev)
2979{
2980 static DEFINE_SPINLOCK(lock);
2981 static __u32 digest[SHA_DIGEST_WORDS];
2982 static __u32 workspace[SHA_WORKSPACE_WORDS];
2983
2984 static union {
2985 char __data[SHA_MESSAGE_BYTES];
2986 struct {
2987 struct in6_addr secret;
2988 __be32 prefix[2];
2989 unsigned char hwaddr[MAX_ADDR_LEN];
2990 u8 dad_count;
2991 } __packed;
2992 } data;
2993
2994 struct in6_addr secret;
2995 struct in6_addr temp;
2996 struct net *net = dev_net(idev->dev);
2997
2998 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
2999
3000 if (idev->cnf.stable_secret.initialized)
3001 secret = idev->cnf.stable_secret.secret;
3002 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3003 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3004 else
3005 return -1;
3006
3007retry:
3008 spin_lock_bh(&lock);
3009
3010 sha_init(digest);
3011 memset(&data, 0, sizeof(data));
3012 memset(workspace, 0, sizeof(workspace));
3013 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3014 data.prefix[0] = address->s6_addr32[0];
3015 data.prefix[1] = address->s6_addr32[1];
3016 data.secret = secret;
3017 data.dad_count = dad_count;
3018
3019 sha_transform(digest, data.__data, workspace);
3020
3021 temp = *address;
3022 temp.s6_addr32[2] = (__force __be32)digest[0];
3023 temp.s6_addr32[3] = (__force __be32)digest[1];
3024
3025 spin_unlock_bh(&lock);
3026
3027 if (ipv6_reserved_interfaceid(temp)) {
3028 dad_count++;
3029 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3030 return -1;
3031 goto retry;
3032 }
3033
3034 *address = temp;
3035 return 0;
3036}
3037
3038static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3039{
3040 struct in6_addr addr;
3041
3042 /* no link local addresses on L3 master devices */
3043 if (netif_is_l3_master(idev->dev))
3044 return;
3045
3046 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3047
3048 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3049 if (!ipv6_generate_stable_address(&addr, 0, idev))
3050 addrconf_add_linklocal(idev, &addr,
3051 IFA_F_STABLE_PRIVACY);
3052 else if (prefix_route)
3053 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3054 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3055 /* addrconf_add_linklocal also adds a prefix_route and we
3056 * only need to care about prefix routes if ipv6_generate_eui64
3057 * couldn't generate one.
3058 */
3059 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3060 addrconf_add_linklocal(idev, &addr, 0);
3061 else if (prefix_route)
3062 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3063 }
3064}
3065
3066static void addrconf_dev_config(struct net_device *dev)
3067{
3068 struct inet6_dev *idev;
3069
3070 ASSERT_RTNL();
3071
3072 if ((dev->type != ARPHRD_ETHER) &&
3073 (dev->type != ARPHRD_FDDI) &&
3074 (dev->type != ARPHRD_ARCNET) &&
3075 (dev->type != ARPHRD_INFINIBAND) &&
3076 (dev->type != ARPHRD_IEEE802154) &&
3077 (dev->type != ARPHRD_IEEE1394) &&
3078 (dev->type != ARPHRD_TUNNEL6) &&
3079 (dev->type != ARPHRD_6LOWPAN)) {
3080 /* Alas, we support only Ethernet autoconfiguration. */
3081 return;
3082 }
3083
3084 idev = addrconf_add_dev(dev);
3085 if (IS_ERR(idev))
3086 return;
3087
3088 addrconf_addr_gen(idev, false);
3089}
3090
3091#if IS_ENABLED(CONFIG_IPV6_SIT)
3092static void addrconf_sit_config(struct net_device *dev)
3093{
3094 struct inet6_dev *idev;
3095
3096 ASSERT_RTNL();
3097
3098 /*
3099 * Configure the tunnel with one of our IPv4
3100 * addresses... we should configure all of
3101 * our v4 addrs in the tunnel
3102 */
3103
3104 idev = ipv6_find_idev(dev);
3105 if (!idev) {
3106 pr_debug("%s: add_dev failed\n", __func__);
3107 return;
3108 }
3109
3110 if (dev->priv_flags & IFF_ISATAP) {
3111 addrconf_addr_gen(idev, false);
3112 return;
3113 }
3114
3115 sit_add_v4_addrs(idev);
3116
3117 if (dev->flags&IFF_POINTOPOINT)
3118 addrconf_add_mroute(dev);
3119}
3120#endif
3121
3122#if IS_ENABLED(CONFIG_NET_IPGRE)
3123static void addrconf_gre_config(struct net_device *dev)
3124{
3125 struct inet6_dev *idev;
3126
3127 ASSERT_RTNL();
3128
3129 idev = ipv6_find_idev(dev);
3130 if (!idev) {
3131 pr_debug("%s: add_dev failed\n", __func__);
3132 return;
3133 }
3134
3135 addrconf_addr_gen(idev, true);
3136 if (dev->flags & IFF_POINTOPOINT)
3137 addrconf_add_mroute(dev);
3138}
3139#endif
3140
3141static int addrconf_notify(struct notifier_block *this, unsigned long event,
3142 void *ptr)
3143{
3144 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3145 struct inet6_dev *idev = __in6_dev_get(dev);
3146 struct net *net = dev_net(dev);
3147 int run_pending = 0;
3148 int err;
3149
3150 switch (event) {
3151 case NETDEV_REGISTER:
3152 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3153 idev = ipv6_add_dev(dev);
3154 if (IS_ERR(idev))
3155 return notifier_from_errno(PTR_ERR(idev));
3156 }
3157 break;
3158
3159 case NETDEV_CHANGEMTU:
3160 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3161 if (dev->mtu < IPV6_MIN_MTU) {
3162 addrconf_ifdown(dev, dev != net->loopback_dev);
3163 break;
3164 }
3165
3166 if (idev) {
3167 rt6_mtu_change(dev, dev->mtu);
3168 idev->cnf.mtu6 = dev->mtu;
3169 break;
3170 }
3171
3172 /* allocate new idev */
3173 idev = ipv6_add_dev(dev);
3174 if (IS_ERR(idev))
3175 break;
3176
3177 /* device is still not ready */
3178 if (!(idev->if_flags & IF_READY))
3179 break;
3180
3181 run_pending = 1;
3182
3183 /* fall through */
3184
3185 case NETDEV_UP:
3186 case NETDEV_CHANGE:
3187 if (dev->flags & IFF_SLAVE)
3188 break;
3189
3190 if (idev && idev->cnf.disable_ipv6)
3191 break;
3192
3193 if (event == NETDEV_UP) {
3194 if (!addrconf_qdisc_ok(dev)) {
3195 /* device is not ready yet. */
3196 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3197 dev->name);
3198 break;
3199 }
3200
3201 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3202 idev = ipv6_add_dev(dev);
3203
3204 if (!IS_ERR_OR_NULL(idev)) {
3205 idev->if_flags |= IF_READY;
3206 run_pending = 1;
3207 }
3208 } else if (event == NETDEV_CHANGE) {
3209 if (!addrconf_qdisc_ok(dev)) {
3210 /* device is still not ready. */
3211 break;
3212 }
3213
3214 if (idev) {
3215 if (idev->if_flags & IF_READY) {
3216 /* device is already configured -
3217 * but resend MLD reports, we might
3218 * have roamed and need to update
3219 * multicast snooping switches
3220 */
3221 ipv6_mc_up(idev);
3222 break;
3223 }
3224 idev->if_flags |= IF_READY;
3225 }
3226
3227 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3228 dev->name);
3229
3230 run_pending = 1;
3231 }
3232
3233 switch (dev->type) {
3234#if IS_ENABLED(CONFIG_IPV6_SIT)
3235 case ARPHRD_SIT:
3236 addrconf_sit_config(dev);
3237 break;
3238#endif
3239#if IS_ENABLED(CONFIG_NET_IPGRE)
3240 case ARPHRD_IPGRE:
3241 addrconf_gre_config(dev);
3242 break;
3243#endif
3244 case ARPHRD_LOOPBACK:
3245 init_loopback(dev);
3246 break;
3247
3248 default:
3249 addrconf_dev_config(dev);
3250 break;
3251 }
3252
3253 if (!IS_ERR_OR_NULL(idev)) {
3254 if (run_pending)
3255 addrconf_dad_run(idev);
3256
3257 /*
3258 * If the MTU changed during the interface down,
3259 * when the interface up, the changed MTU must be
3260 * reflected in the idev as well as routers.
3261 */
3262 if (idev->cnf.mtu6 != dev->mtu &&
3263 dev->mtu >= IPV6_MIN_MTU) {
3264 rt6_mtu_change(dev, dev->mtu);
3265 idev->cnf.mtu6 = dev->mtu;
3266 }
3267 idev->tstamp = jiffies;
3268 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3269
3270 /*
3271 * If the changed mtu during down is lower than
3272 * IPV6_MIN_MTU stop IPv6 on this interface.
3273 */
3274 if (dev->mtu < IPV6_MIN_MTU)
3275 addrconf_ifdown(dev, dev != net->loopback_dev);
3276 }
3277 break;
3278
3279 case NETDEV_DOWN:
3280 case NETDEV_UNREGISTER:
3281 /*
3282 * Remove all addresses from this interface.
3283 */
3284 addrconf_ifdown(dev, event != NETDEV_DOWN);
3285 break;
3286
3287 case NETDEV_CHANGENAME:
3288 if (idev) {
3289 snmp6_unregister_dev(idev);
3290 addrconf_sysctl_unregister(idev);
3291 err = addrconf_sysctl_register(idev);
3292 if (err)
3293 return notifier_from_errno(err);
3294 err = snmp6_register_dev(idev);
3295 if (err) {
3296 addrconf_sysctl_unregister(idev);
3297 return notifier_from_errno(err);
3298 }
3299 }
3300 break;
3301
3302 case NETDEV_PRE_TYPE_CHANGE:
3303 case NETDEV_POST_TYPE_CHANGE:
3304 addrconf_type_change(dev, event);
3305 break;
3306 }
3307
3308 return NOTIFY_OK;
3309}
3310
3311/*
3312 * addrconf module should be notified of a device going up
3313 */
3314static struct notifier_block ipv6_dev_notf = {
3315 .notifier_call = addrconf_notify,
3316 .priority = ADDRCONF_NOTIFY_PRIORITY,
3317};
3318
3319static void addrconf_type_change(struct net_device *dev, unsigned long event)
3320{
3321 struct inet6_dev *idev;
3322 ASSERT_RTNL();
3323
3324 idev = __in6_dev_get(dev);
3325
3326 if (event == NETDEV_POST_TYPE_CHANGE)
3327 ipv6_mc_remap(idev);
3328 else if (event == NETDEV_PRE_TYPE_CHANGE)
3329 ipv6_mc_unmap(idev);
3330}
3331
3332static int addrconf_ifdown(struct net_device *dev, int how)
3333{
3334 struct net *net = dev_net(dev);
3335 struct inet6_dev *idev;
3336 struct inet6_ifaddr *ifa;
3337 int state, i;
3338
3339 ASSERT_RTNL();
3340
3341 rt6_ifdown(net, dev);
3342 neigh_ifdown(&nd_tbl, dev);
3343
3344 idev = __in6_dev_get(dev);
3345 if (!idev)
3346 return -ENODEV;
3347
3348 /*
3349 * Step 1: remove reference to ipv6 device from parent device.
3350 * Do not dev_put!
3351 */
3352 if (how) {
3353 idev->dead = 1;
3354
3355 /* protected by rtnl_lock */
3356 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3357
3358 /* Step 1.5: remove snmp6 entry */
3359 snmp6_unregister_dev(idev);
3360
3361 }
3362
3363 /* Step 2: clear hash table */
3364 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3365 struct hlist_head *h = &inet6_addr_lst[i];
3366
3367 spin_lock_bh(&addrconf_hash_lock);
3368restart:
3369 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3370 if (ifa->idev == idev) {
3371 hlist_del_init_rcu(&ifa->addr_lst);
3372 addrconf_del_dad_work(ifa);
3373 goto restart;
3374 }
3375 }
3376 spin_unlock_bh(&addrconf_hash_lock);
3377 }
3378
3379 write_lock_bh(&idev->lock);
3380
3381 addrconf_del_rs_timer(idev);
3382
3383 /* Step 2: clear flags for stateless addrconf */
3384 if (!how)
3385 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3386
3387 if (how && del_timer(&idev->regen_timer))
3388 in6_dev_put(idev);
3389
3390 /* Step 3: clear tempaddr list */
3391 while (!list_empty(&idev->tempaddr_list)) {
3392 ifa = list_first_entry(&idev->tempaddr_list,
3393 struct inet6_ifaddr, tmp_list);
3394 list_del(&ifa->tmp_list);
3395 write_unlock_bh(&idev->lock);
3396 spin_lock_bh(&ifa->lock);
3397
3398 if (ifa->ifpub) {
3399 in6_ifa_put(ifa->ifpub);
3400 ifa->ifpub = NULL;
3401 }
3402 spin_unlock_bh(&ifa->lock);
3403 in6_ifa_put(ifa);
3404 write_lock_bh(&idev->lock);
3405 }
3406
3407 while (!list_empty(&idev->addr_list)) {
3408 ifa = list_first_entry(&idev->addr_list,
3409 struct inet6_ifaddr, if_list);
3410 addrconf_del_dad_work(ifa);
3411
3412 list_del(&ifa->if_list);
3413
3414 write_unlock_bh(&idev->lock);
3415
3416 spin_lock_bh(&ifa->lock);
3417 state = ifa->state;
3418 ifa->state = INET6_IFADDR_STATE_DEAD;
3419 spin_unlock_bh(&ifa->lock);
3420
3421 if (state != INET6_IFADDR_STATE_DEAD) {
3422 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3423 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3424 }
3425 in6_ifa_put(ifa);
3426
3427 write_lock_bh(&idev->lock);
3428 }
3429
3430 write_unlock_bh(&idev->lock);
3431
3432 /* Step 5: Discard anycast and multicast list */
3433 if (how) {
3434 ipv6_ac_destroy_dev(idev);
3435 ipv6_mc_destroy_dev(idev);
3436 } else {
3437 ipv6_mc_down(idev);
3438 }
3439
3440 idev->tstamp = jiffies;
3441
3442 /* Last: Shot the device (if unregistered) */
3443 if (how) {
3444 addrconf_sysctl_unregister(idev);
3445 neigh_parms_release(&nd_tbl, idev->nd_parms);
3446 neigh_ifdown(&nd_tbl, dev);
3447 in6_dev_put(idev);
3448 }
3449 return 0;
3450}
3451
3452static void addrconf_rs_timer(unsigned long data)
3453{
3454 struct inet6_dev *idev = (struct inet6_dev *)data;
3455 struct net_device *dev = idev->dev;
3456 struct in6_addr lladdr;
3457
3458 write_lock(&idev->lock);
3459 if (idev->dead || !(idev->if_flags & IF_READY))
3460 goto out;
3461
3462 if (!ipv6_accept_ra(idev))
3463 goto out;
3464
3465 /* Announcement received after solicitation was sent */
3466 if (idev->if_flags & IF_RA_RCVD)
3467 goto out;
3468
3469 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3470 write_unlock(&idev->lock);
3471 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3472 ndisc_send_rs(dev, &lladdr,
3473 &in6addr_linklocal_allrouters);
3474 else
3475 goto put;
3476
3477 write_lock(&idev->lock);
3478 /* The wait after the last probe can be shorter */
3479 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3480 idev->cnf.rtr_solicits) ?
3481 idev->cnf.rtr_solicit_delay :
3482 idev->cnf.rtr_solicit_interval);
3483 } else {
3484 /*
3485 * Note: we do not support deprecated "all on-link"
3486 * assumption any longer.
3487 */
3488 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3489 }
3490
3491out:
3492 write_unlock(&idev->lock);
3493put:
3494 in6_dev_put(idev);
3495}
3496
3497/*
3498 * Duplicate Address Detection
3499 */
3500static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3501{
3502 unsigned long rand_num;
3503 struct inet6_dev *idev = ifp->idev;
3504
3505 if (ifp->flags & IFA_F_OPTIMISTIC)
3506 rand_num = 0;
3507 else
3508 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3509
3510 ifp->dad_probes = idev->cnf.dad_transmits;
3511 addrconf_mod_dad_work(ifp, rand_num);
3512}
3513
3514static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3515{
3516 struct inet6_dev *idev = ifp->idev;
3517 struct net_device *dev = idev->dev;
3518 bool notify = false;
3519
3520 addrconf_join_solict(dev, &ifp->addr);
3521
3522 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3523
3524 read_lock_bh(&idev->lock);
3525 spin_lock(&ifp->lock);
3526 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3527 goto out;
3528
3529 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3530 idev->cnf.accept_dad < 1 ||
3531 !(ifp->flags&IFA_F_TENTATIVE) ||
3532 ifp->flags & IFA_F_NODAD) {
3533 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3534 spin_unlock(&ifp->lock);
3535 read_unlock_bh(&idev->lock);
3536
3537 addrconf_dad_completed(ifp);
3538 return;
3539 }
3540
3541 if (!(idev->if_flags & IF_READY)) {
3542 spin_unlock(&ifp->lock);
3543 read_unlock_bh(&idev->lock);
3544 /*
3545 * If the device is not ready:
3546 * - keep it tentative if it is a permanent address.
3547 * - otherwise, kill it.
3548 */
3549 in6_ifa_hold(ifp);
3550 addrconf_dad_stop(ifp, 0);
3551 return;
3552 }
3553
3554 /*
3555 * Optimistic nodes can start receiving
3556 * Frames right away
3557 */
3558 if (ifp->flags & IFA_F_OPTIMISTIC) {
3559 ip6_ins_rt(ifp->rt);
3560 if (ipv6_use_optimistic_addr(idev)) {
3561 /* Because optimistic nodes can use this address,
3562 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3563 */
3564 notify = true;
3565 }
3566 }
3567
3568 addrconf_dad_kick(ifp);
3569out:
3570 spin_unlock(&ifp->lock);
3571 read_unlock_bh(&idev->lock);
3572 if (notify)
3573 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3574}
3575
3576static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3577{
3578 bool begin_dad = false;
3579
3580 spin_lock_bh(&ifp->lock);
3581 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3582 ifp->state = INET6_IFADDR_STATE_PREDAD;
3583 begin_dad = true;
3584 }
3585 spin_unlock_bh(&ifp->lock);
3586
3587 if (begin_dad)
3588 addrconf_mod_dad_work(ifp, 0);
3589}
3590
3591static void addrconf_dad_work(struct work_struct *w)
3592{
3593 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3594 struct inet6_ifaddr,
3595 dad_work);
3596 struct inet6_dev *idev = ifp->idev;
3597 struct in6_addr mcaddr;
3598
3599 enum {
3600 DAD_PROCESS,
3601 DAD_BEGIN,
3602 DAD_ABORT,
3603 } action = DAD_PROCESS;
3604
3605 rtnl_lock();
3606
3607 spin_lock_bh(&ifp->lock);
3608 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3609 action = DAD_BEGIN;
3610 ifp->state = INET6_IFADDR_STATE_DAD;
3611 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3612 action = DAD_ABORT;
3613 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3614 }
3615 spin_unlock_bh(&ifp->lock);
3616
3617 if (action == DAD_BEGIN) {
3618 addrconf_dad_begin(ifp);
3619 goto out;
3620 } else if (action == DAD_ABORT) {
3621 in6_ifa_hold(ifp);
3622 addrconf_dad_stop(ifp, 1);
3623 goto out;
3624 }
3625
3626 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3627 goto out;
3628
3629 write_lock_bh(&idev->lock);
3630 if (idev->dead || !(idev->if_flags & IF_READY)) {
3631 write_unlock_bh(&idev->lock);
3632 goto out;
3633 }
3634
3635 spin_lock(&ifp->lock);
3636 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3637 spin_unlock(&ifp->lock);
3638 write_unlock_bh(&idev->lock);
3639 goto out;
3640 }
3641
3642 if (ifp->dad_probes == 0) {
3643 /*
3644 * DAD was successful
3645 */
3646
3647 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3648 spin_unlock(&ifp->lock);
3649 write_unlock_bh(&idev->lock);
3650
3651 addrconf_dad_completed(ifp);
3652
3653 goto out;
3654 }
3655
3656 ifp->dad_probes--;
3657 addrconf_mod_dad_work(ifp,
3658 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3659 spin_unlock(&ifp->lock);
3660 write_unlock_bh(&idev->lock);
3661
3662 /* send a neighbour solicitation for our addr */
3663 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3664 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3665out:
3666 in6_ifa_put(ifp);
3667 rtnl_unlock();
3668}
3669
3670/* ifp->idev must be at least read locked */
3671static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3672{
3673 struct inet6_ifaddr *ifpiter;
3674 struct inet6_dev *idev = ifp->idev;
3675
3676 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3677 if (ifpiter->scope > IFA_LINK)
3678 break;
3679 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3680 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3681 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3682 IFA_F_PERMANENT)
3683 return false;
3684 }
3685 return true;
3686}
3687
3688static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3689{
3690 struct net_device *dev = ifp->idev->dev;
3691 struct in6_addr lladdr;
3692 bool send_rs, send_mld;
3693
3694 addrconf_del_dad_work(ifp);
3695
3696 /*
3697 * Configure the address for reception. Now it is valid.
3698 */
3699
3700 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3701
3702 /* If added prefix is link local and we are prepared to process
3703 router advertisements, start sending router solicitations.
3704 */
3705
3706 read_lock_bh(&ifp->idev->lock);
3707 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3708 send_rs = send_mld &&
3709 ipv6_accept_ra(ifp->idev) &&
3710 ifp->idev->cnf.rtr_solicits > 0 &&
3711 (dev->flags&IFF_LOOPBACK) == 0;
3712 read_unlock_bh(&ifp->idev->lock);
3713
3714 /* While dad is in progress mld report's source address is in6_addrany.
3715 * Resend with proper ll now.
3716 */
3717 if (send_mld)
3718 ipv6_mc_dad_complete(ifp->idev);
3719
3720 if (send_rs) {
3721 /*
3722 * If a host as already performed a random delay
3723 * [...] as part of DAD [...] there is no need
3724 * to delay again before sending the first RS
3725 */
3726 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3727 return;
3728 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3729
3730 write_lock_bh(&ifp->idev->lock);
3731 spin_lock(&ifp->lock);
3732 ifp->idev->rs_probes = 1;
3733 ifp->idev->if_flags |= IF_RS_SENT;
3734 addrconf_mod_rs_timer(ifp->idev,
3735 ifp->idev->cnf.rtr_solicit_interval);
3736 spin_unlock(&ifp->lock);
3737 write_unlock_bh(&ifp->idev->lock);
3738 }
3739}
3740
3741static void addrconf_dad_run(struct inet6_dev *idev)
3742{
3743 struct inet6_ifaddr *ifp;
3744
3745 read_lock_bh(&idev->lock);
3746 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3747 spin_lock(&ifp->lock);
3748 if (ifp->flags & IFA_F_TENTATIVE &&
3749 ifp->state == INET6_IFADDR_STATE_DAD)
3750 addrconf_dad_kick(ifp);
3751 spin_unlock(&ifp->lock);
3752 }
3753 read_unlock_bh(&idev->lock);
3754}
3755
3756#ifdef CONFIG_PROC_FS
3757struct if6_iter_state {
3758 struct seq_net_private p;
3759 int bucket;
3760 int offset;
3761};
3762
3763static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3764{
3765 struct inet6_ifaddr *ifa = NULL;
3766 struct if6_iter_state *state = seq->private;
3767 struct net *net = seq_file_net(seq);
3768 int p = 0;
3769
3770 /* initial bucket if pos is 0 */
3771 if (pos == 0) {
3772 state->bucket = 0;
3773 state->offset = 0;
3774 }
3775
3776 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3777 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3778 addr_lst) {
3779 if (!net_eq(dev_net(ifa->idev->dev), net))
3780 continue;
3781 /* sync with offset */
3782 if (p < state->offset) {
3783 p++;
3784 continue;
3785 }
3786 state->offset++;
3787 return ifa;
3788 }
3789
3790 /* prepare for next bucket */
3791 state->offset = 0;
3792 p = 0;
3793 }
3794 return NULL;
3795}
3796
3797static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3798 struct inet6_ifaddr *ifa)
3799{
3800 struct if6_iter_state *state = seq->private;
3801 struct net *net = seq_file_net(seq);
3802
3803 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3804 if (!net_eq(dev_net(ifa->idev->dev), net))
3805 continue;
3806 state->offset++;
3807 return ifa;
3808 }
3809
3810 while (++state->bucket < IN6_ADDR_HSIZE) {
3811 state->offset = 0;
3812 hlist_for_each_entry_rcu_bh(ifa,
3813 &inet6_addr_lst[state->bucket], addr_lst) {
3814 if (!net_eq(dev_net(ifa->idev->dev), net))
3815 continue;
3816 state->offset++;
3817 return ifa;
3818 }
3819 }
3820
3821 return NULL;
3822}
3823
3824static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3825 __acquires(rcu_bh)
3826{
3827 rcu_read_lock_bh();
3828 return if6_get_first(seq, *pos);
3829}
3830
3831static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3832{
3833 struct inet6_ifaddr *ifa;
3834
3835 ifa = if6_get_next(seq, v);
3836 ++*pos;
3837 return ifa;
3838}
3839
3840static void if6_seq_stop(struct seq_file *seq, void *v)
3841 __releases(rcu_bh)
3842{
3843 rcu_read_unlock_bh();
3844}
3845
3846static int if6_seq_show(struct seq_file *seq, void *v)
3847{
3848 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3849 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3850 &ifp->addr,
3851 ifp->idev->dev->ifindex,
3852 ifp->prefix_len,
3853 ifp->scope,
3854 (u8) ifp->flags,
3855 ifp->idev->dev->name);
3856 return 0;
3857}
3858
3859static const struct seq_operations if6_seq_ops = {
3860 .start = if6_seq_start,
3861 .next = if6_seq_next,
3862 .show = if6_seq_show,
3863 .stop = if6_seq_stop,
3864};
3865
3866static int if6_seq_open(struct inode *inode, struct file *file)
3867{
3868 return seq_open_net(inode, file, &if6_seq_ops,
3869 sizeof(struct if6_iter_state));
3870}
3871
3872static const struct file_operations if6_fops = {
3873 .owner = THIS_MODULE,
3874 .open = if6_seq_open,
3875 .read = seq_read,
3876 .llseek = seq_lseek,
3877 .release = seq_release_net,
3878};
3879
3880static int __net_init if6_proc_net_init(struct net *net)
3881{
3882 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3883 return -ENOMEM;
3884 return 0;
3885}
3886
3887static void __net_exit if6_proc_net_exit(struct net *net)
3888{
3889 remove_proc_entry("if_inet6", net->proc_net);
3890}
3891
3892static struct pernet_operations if6_proc_net_ops = {
3893 .init = if6_proc_net_init,
3894 .exit = if6_proc_net_exit,
3895};
3896
3897int __init if6_proc_init(void)
3898{
3899 return register_pernet_subsys(&if6_proc_net_ops);
3900}
3901
3902void if6_proc_exit(void)
3903{
3904 unregister_pernet_subsys(&if6_proc_net_ops);
3905}
3906#endif /* CONFIG_PROC_FS */
3907
3908#if IS_ENABLED(CONFIG_IPV6_MIP6)
3909/* Check if address is a home address configured on any interface. */
3910int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3911{
3912 int ret = 0;
3913 struct inet6_ifaddr *ifp = NULL;
3914 unsigned int hash = inet6_addr_hash(addr);
3915
3916 rcu_read_lock_bh();
3917 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3918 if (!net_eq(dev_net(ifp->idev->dev), net))
3919 continue;
3920 if (ipv6_addr_equal(&ifp->addr, addr) &&
3921 (ifp->flags & IFA_F_HOMEADDRESS)) {
3922 ret = 1;
3923 break;
3924 }
3925 }
3926 rcu_read_unlock_bh();
3927 return ret;
3928}
3929#endif
3930
3931/*
3932 * Periodic address status verification
3933 */
3934
3935static void addrconf_verify_rtnl(void)
3936{
3937 unsigned long now, next, next_sec, next_sched;
3938 struct inet6_ifaddr *ifp;
3939 int i;
3940
3941 ASSERT_RTNL();
3942
3943 rcu_read_lock_bh();
3944 now = jiffies;
3945 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3946
3947 cancel_delayed_work(&addr_chk_work);
3948
3949 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3950restart:
3951 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3952 unsigned long age;
3953
3954 /* When setting preferred_lft to a value not zero or
3955 * infinity, while valid_lft is infinity
3956 * IFA_F_PERMANENT has a non-infinity life time.
3957 */
3958 if ((ifp->flags & IFA_F_PERMANENT) &&
3959 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3960 continue;
3961
3962 spin_lock(&ifp->lock);
3963 /* We try to batch several events at once. */
3964 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3965
3966 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3967 age >= ifp->valid_lft) {
3968 spin_unlock(&ifp->lock);
3969 in6_ifa_hold(ifp);
3970 ipv6_del_addr(ifp);
3971 goto restart;
3972 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3973 spin_unlock(&ifp->lock);
3974 continue;
3975 } else if (age >= ifp->prefered_lft) {
3976 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3977 int deprecate = 0;
3978
3979 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3980 deprecate = 1;
3981 ifp->flags |= IFA_F_DEPRECATED;
3982 }
3983
3984 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3985 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3986 next = ifp->tstamp + ifp->valid_lft * HZ;
3987
3988 spin_unlock(&ifp->lock);
3989
3990 if (deprecate) {
3991 in6_ifa_hold(ifp);
3992
3993 ipv6_ifa_notify(0, ifp);
3994 in6_ifa_put(ifp);
3995 goto restart;
3996 }
3997 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3998 !(ifp->flags&IFA_F_TENTATIVE)) {
3999 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4000 ifp->idev->cnf.dad_transmits *
4001 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
4002
4003 if (age >= ifp->prefered_lft - regen_advance) {
4004 struct inet6_ifaddr *ifpub = ifp->ifpub;
4005 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4006 next = ifp->tstamp + ifp->prefered_lft * HZ;
4007 if (!ifp->regen_count && ifpub) {
4008 ifp->regen_count++;
4009 in6_ifa_hold(ifp);
4010 in6_ifa_hold(ifpub);
4011 spin_unlock(&ifp->lock);
4012
4013 spin_lock(&ifpub->lock);
4014 ifpub->regen_count = 0;
4015 spin_unlock(&ifpub->lock);
4016 ipv6_create_tempaddr(ifpub, ifp);
4017 in6_ifa_put(ifpub);
4018 in6_ifa_put(ifp);
4019 goto restart;
4020 }
4021 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4022 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4023 spin_unlock(&ifp->lock);
4024 } else {
4025 /* ifp->prefered_lft <= ifp->valid_lft */
4026 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4027 next = ifp->tstamp + ifp->prefered_lft * HZ;
4028 spin_unlock(&ifp->lock);
4029 }
4030 }
4031 }
4032
4033 next_sec = round_jiffies_up(next);
4034 next_sched = next;
4035
4036 /* If rounded timeout is accurate enough, accept it. */
4037 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4038 next_sched = next_sec;
4039
4040 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4041 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4042 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4043
4044 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4045 now, next, next_sec, next_sched);
4046 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4047 rcu_read_unlock_bh();
4048}
4049
4050static void addrconf_verify_work(struct work_struct *w)
4051{
4052 rtnl_lock();
4053 addrconf_verify_rtnl();
4054 rtnl_unlock();
4055}
4056
4057static void addrconf_verify(void)
4058{
4059 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4060}
4061
4062static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4063 struct in6_addr **peer_pfx)
4064{
4065 struct in6_addr *pfx = NULL;
4066
4067 *peer_pfx = NULL;
4068
4069 if (addr)
4070 pfx = nla_data(addr);
4071
4072 if (local) {
4073 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4074 *peer_pfx = pfx;
4075 pfx = nla_data(local);
4076 }
4077
4078 return pfx;
4079}
4080
4081static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4082 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4083 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4084 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4085 [IFA_FLAGS] = { .len = sizeof(u32) },
4086};
4087
4088static int
4089inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4090{
4091 struct net *net = sock_net(skb->sk);
4092 struct ifaddrmsg *ifm;
4093 struct nlattr *tb[IFA_MAX+1];
4094 struct in6_addr *pfx, *peer_pfx;
4095 u32 ifa_flags;
4096 int err;
4097
4098 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4099 if (err < 0)
4100 return err;
4101
4102 ifm = nlmsg_data(nlh);
4103 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4104 if (!pfx)
4105 return -EINVAL;
4106
4107 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4108
4109 /* We ignore other flags so far. */
4110 ifa_flags &= IFA_F_MANAGETEMPADDR;
4111
4112 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4113 ifm->ifa_prefixlen);
4114}
4115
4116static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4117 u32 prefered_lft, u32 valid_lft)
4118{
4119 u32 flags;
4120 clock_t expires;
4121 unsigned long timeout;
4122 bool was_managetempaddr;
4123 bool had_prefixroute;
4124
4125 ASSERT_RTNL();
4126
4127 if (!valid_lft || (prefered_lft > valid_lft))
4128 return -EINVAL;
4129
4130 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4131 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4132 return -EINVAL;
4133
4134 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4135 if (addrconf_finite_timeout(timeout)) {
4136 expires = jiffies_to_clock_t(timeout * HZ);
4137 valid_lft = timeout;
4138 flags = RTF_EXPIRES;
4139 } else {
4140 expires = 0;
4141 flags = 0;
4142 ifa_flags |= IFA_F_PERMANENT;
4143 }
4144
4145 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4146 if (addrconf_finite_timeout(timeout)) {
4147 if (timeout == 0)
4148 ifa_flags |= IFA_F_DEPRECATED;
4149 prefered_lft = timeout;
4150 }
4151
4152 spin_lock_bh(&ifp->lock);
4153 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4154 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4155 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4156 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4157 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4158 IFA_F_NOPREFIXROUTE);
4159 ifp->flags |= ifa_flags;
4160 ifp->tstamp = jiffies;
4161 ifp->valid_lft = valid_lft;
4162 ifp->prefered_lft = prefered_lft;
4163
4164 spin_unlock_bh(&ifp->lock);
4165 if (!(ifp->flags&IFA_F_TENTATIVE))
4166 ipv6_ifa_notify(0, ifp);
4167
4168 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4169 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4170 expires, flags);
4171 } else if (had_prefixroute) {
4172 enum cleanup_prefix_rt_t action;
4173 unsigned long rt_expires;
4174
4175 write_lock_bh(&ifp->idev->lock);
4176 action = check_cleanup_prefix_route(ifp, &rt_expires);
4177 write_unlock_bh(&ifp->idev->lock);
4178
4179 if (action != CLEANUP_PREFIX_RT_NOP) {
4180 cleanup_prefix_route(ifp, rt_expires,
4181 action == CLEANUP_PREFIX_RT_DEL);
4182 }
4183 }
4184
4185 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4186 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4187 valid_lft = prefered_lft = 0;
4188 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4189 !was_managetempaddr, jiffies);
4190 }
4191
4192 addrconf_verify_rtnl();
4193
4194 return 0;
4195}
4196
4197static int
4198inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4199{
4200 struct net *net = sock_net(skb->sk);
4201 struct ifaddrmsg *ifm;
4202 struct nlattr *tb[IFA_MAX+1];
4203 struct in6_addr *pfx, *peer_pfx;
4204 struct inet6_ifaddr *ifa;
4205 struct net_device *dev;
4206 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4207 u32 ifa_flags;
4208 int err;
4209
4210 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4211 if (err < 0)
4212 return err;
4213
4214 ifm = nlmsg_data(nlh);
4215 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4216 if (!pfx)
4217 return -EINVAL;
4218
4219 if (tb[IFA_CACHEINFO]) {
4220 struct ifa_cacheinfo *ci;
4221
4222 ci = nla_data(tb[IFA_CACHEINFO]);
4223 valid_lft = ci->ifa_valid;
4224 preferred_lft = ci->ifa_prefered;
4225 } else {
4226 preferred_lft = INFINITY_LIFE_TIME;
4227 valid_lft = INFINITY_LIFE_TIME;
4228 }
4229
4230 dev = __dev_get_by_index(net, ifm->ifa_index);
4231 if (!dev)
4232 return -ENODEV;
4233
4234 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4235
4236 /* We ignore other flags so far. */
4237 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4238 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4239
4240 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4241 if (!ifa) {
4242 /*
4243 * It would be best to check for !NLM_F_CREATE here but
4244 * userspace already relies on not having to provide this.
4245 */
4246 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4247 ifm->ifa_prefixlen, ifa_flags,
4248 preferred_lft, valid_lft);
4249 }
4250
4251 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4252 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4253 err = -EEXIST;
4254 else
4255 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4256
4257 in6_ifa_put(ifa);
4258
4259 return err;
4260}
4261
4262static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4263 u8 scope, int ifindex)
4264{
4265 struct ifaddrmsg *ifm;
4266
4267 ifm = nlmsg_data(nlh);
4268 ifm->ifa_family = AF_INET6;
4269 ifm->ifa_prefixlen = prefixlen;
4270 ifm->ifa_flags = flags;
4271 ifm->ifa_scope = scope;
4272 ifm->ifa_index = ifindex;
4273}
4274
4275static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4276 unsigned long tstamp, u32 preferred, u32 valid)
4277{
4278 struct ifa_cacheinfo ci;
4279
4280 ci.cstamp = cstamp_delta(cstamp);
4281 ci.tstamp = cstamp_delta(tstamp);
4282 ci.ifa_prefered = preferred;
4283 ci.ifa_valid = valid;
4284
4285 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4286}
4287
4288static inline int rt_scope(int ifa_scope)
4289{
4290 if (ifa_scope & IFA_HOST)
4291 return RT_SCOPE_HOST;
4292 else if (ifa_scope & IFA_LINK)
4293 return RT_SCOPE_LINK;
4294 else if (ifa_scope & IFA_SITE)
4295 return RT_SCOPE_SITE;
4296 else
4297 return RT_SCOPE_UNIVERSE;
4298}
4299
4300static inline int inet6_ifaddr_msgsize(void)
4301{
4302 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4303 + nla_total_size(16) /* IFA_LOCAL */
4304 + nla_total_size(16) /* IFA_ADDRESS */
4305 + nla_total_size(sizeof(struct ifa_cacheinfo))
4306 + nla_total_size(4) /* IFA_FLAGS */;
4307}
4308
4309static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4310 u32 portid, u32 seq, int event, unsigned int flags)
4311{
4312 struct nlmsghdr *nlh;
4313 u32 preferred, valid;
4314
4315 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4316 if (!nlh)
4317 return -EMSGSIZE;
4318
4319 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4320 ifa->idev->dev->ifindex);
4321
4322 if (!((ifa->flags&IFA_F_PERMANENT) &&
4323 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4324 preferred = ifa->prefered_lft;
4325 valid = ifa->valid_lft;
4326 if (preferred != INFINITY_LIFE_TIME) {
4327 long tval = (jiffies - ifa->tstamp)/HZ;
4328 if (preferred > tval)
4329 preferred -= tval;
4330 else
4331 preferred = 0;
4332 if (valid != INFINITY_LIFE_TIME) {
4333 if (valid > tval)
4334 valid -= tval;
4335 else
4336 valid = 0;
4337 }
4338 }
4339 } else {
4340 preferred = INFINITY_LIFE_TIME;
4341 valid = INFINITY_LIFE_TIME;
4342 }
4343
4344 if (!ipv6_addr_any(&ifa->peer_addr)) {
4345 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4346 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4347 goto error;
4348 } else
4349 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4350 goto error;
4351
4352 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4353 goto error;
4354
4355 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4356 goto error;
4357
4358 nlmsg_end(skb, nlh);
4359 return 0;
4360
4361error:
4362 nlmsg_cancel(skb, nlh);
4363 return -EMSGSIZE;
4364}
4365
4366static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4367 u32 portid, u32 seq, int event, u16 flags)
4368{
4369 struct nlmsghdr *nlh;
4370 u8 scope = RT_SCOPE_UNIVERSE;
4371 int ifindex = ifmca->idev->dev->ifindex;
4372
4373 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4374 scope = RT_SCOPE_SITE;
4375
4376 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4377 if (!nlh)
4378 return -EMSGSIZE;
4379
4380 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4381 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4382 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4383 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4384 nlmsg_cancel(skb, nlh);
4385 return -EMSGSIZE;
4386 }
4387
4388 nlmsg_end(skb, nlh);
4389 return 0;
4390}
4391
4392static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4393 u32 portid, u32 seq, int event, unsigned int flags)
4394{
4395 struct nlmsghdr *nlh;
4396 u8 scope = RT_SCOPE_UNIVERSE;
4397 int ifindex = ifaca->aca_idev->dev->ifindex;
4398
4399 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4400 scope = RT_SCOPE_SITE;
4401
4402 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4403 if (!nlh)
4404 return -EMSGSIZE;
4405
4406 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4407 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4408 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4409 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4410 nlmsg_cancel(skb, nlh);
4411 return -EMSGSIZE;
4412 }
4413
4414 nlmsg_end(skb, nlh);
4415 return 0;
4416}
4417
4418enum addr_type_t {
4419 UNICAST_ADDR,
4420 MULTICAST_ADDR,
4421 ANYCAST_ADDR,
4422};
4423
4424/* called with rcu_read_lock() */
4425static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4426 struct netlink_callback *cb, enum addr_type_t type,
4427 int s_ip_idx, int *p_ip_idx)
4428{
4429 struct ifmcaddr6 *ifmca;
4430 struct ifacaddr6 *ifaca;
4431 int err = 1;
4432 int ip_idx = *p_ip_idx;
4433
4434 read_lock_bh(&idev->lock);
4435 switch (type) {
4436 case UNICAST_ADDR: {
4437 struct inet6_ifaddr *ifa;
4438
4439 /* unicast address incl. temp addr */
4440 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4441 if (++ip_idx < s_ip_idx)
4442 continue;
4443 err = inet6_fill_ifaddr(skb, ifa,
4444 NETLINK_CB(cb->skb).portid,
4445 cb->nlh->nlmsg_seq,
4446 RTM_NEWADDR,
4447 NLM_F_MULTI);
4448 if (err < 0)
4449 break;
4450 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4451 }
4452 break;
4453 }
4454 case MULTICAST_ADDR:
4455 /* multicast address */
4456 for (ifmca = idev->mc_list; ifmca;
4457 ifmca = ifmca->next, ip_idx++) {
4458 if (ip_idx < s_ip_idx)
4459 continue;
4460 err = inet6_fill_ifmcaddr(skb, ifmca,
4461 NETLINK_CB(cb->skb).portid,
4462 cb->nlh->nlmsg_seq,
4463 RTM_GETMULTICAST,
4464 NLM_F_MULTI);
4465 if (err < 0)
4466 break;
4467 }
4468 break;
4469 case ANYCAST_ADDR:
4470 /* anycast address */
4471 for (ifaca = idev->ac_list; ifaca;
4472 ifaca = ifaca->aca_next, ip_idx++) {
4473 if (ip_idx < s_ip_idx)
4474 continue;
4475 err = inet6_fill_ifacaddr(skb, ifaca,
4476 NETLINK_CB(cb->skb).portid,
4477 cb->nlh->nlmsg_seq,
4478 RTM_GETANYCAST,
4479 NLM_F_MULTI);
4480 if (err < 0)
4481 break;
4482 }
4483 break;
4484 default:
4485 break;
4486 }
4487 read_unlock_bh(&idev->lock);
4488 *p_ip_idx = ip_idx;
4489 return err;
4490}
4491
4492static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4493 enum addr_type_t type)
4494{
4495 struct net *net = sock_net(skb->sk);
4496 int h, s_h;
4497 int idx, ip_idx;
4498 int s_idx, s_ip_idx;
4499 struct net_device *dev;
4500 struct inet6_dev *idev;
4501 struct hlist_head *head;
4502
4503 s_h = cb->args[0];
4504 s_idx = idx = cb->args[1];
4505 s_ip_idx = ip_idx = cb->args[2];
4506
4507 rcu_read_lock();
4508 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4509 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4510 idx = 0;
4511 head = &net->dev_index_head[h];
4512 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4513 if (idx < s_idx)
4514 goto cont;
4515 if (h > s_h || idx > s_idx)
4516 s_ip_idx = 0;
4517 ip_idx = 0;
4518 idev = __in6_dev_get(dev);
4519 if (!idev)
4520 goto cont;
4521
4522 if (in6_dump_addrs(idev, skb, cb, type,
4523 s_ip_idx, &ip_idx) < 0)
4524 goto done;
4525cont:
4526 idx++;
4527 }
4528 }
4529done:
4530 rcu_read_unlock();
4531 cb->args[0] = h;
4532 cb->args[1] = idx;
4533 cb->args[2] = ip_idx;
4534
4535 return skb->len;
4536}
4537
4538static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4539{
4540 enum addr_type_t type = UNICAST_ADDR;
4541
4542 return inet6_dump_addr(skb, cb, type);
4543}
4544
4545static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4546{
4547 enum addr_type_t type = MULTICAST_ADDR;
4548
4549 return inet6_dump_addr(skb, cb, type);
4550}
4551
4552
4553static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4554{
4555 enum addr_type_t type = ANYCAST_ADDR;
4556
4557 return inet6_dump_addr(skb, cb, type);
4558}
4559
4560static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4561{
4562 struct net *net = sock_net(in_skb->sk);
4563 struct ifaddrmsg *ifm;
4564 struct nlattr *tb[IFA_MAX+1];
4565 struct in6_addr *addr = NULL, *peer;
4566 struct net_device *dev = NULL;
4567 struct inet6_ifaddr *ifa;
4568 struct sk_buff *skb;
4569 int err;
4570
4571 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4572 if (err < 0)
4573 goto errout;
4574
4575 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4576 if (!addr) {
4577 err = -EINVAL;
4578 goto errout;
4579 }
4580
4581 ifm = nlmsg_data(nlh);
4582 if (ifm->ifa_index)
4583 dev = __dev_get_by_index(net, ifm->ifa_index);
4584
4585 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4586 if (!ifa) {
4587 err = -EADDRNOTAVAIL;
4588 goto errout;
4589 }
4590
4591 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4592 if (!skb) {
4593 err = -ENOBUFS;
4594 goto errout_ifa;
4595 }
4596
4597 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4598 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4599 if (err < 0) {
4600 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4601 WARN_ON(err == -EMSGSIZE);
4602 kfree_skb(skb);
4603 goto errout_ifa;
4604 }
4605 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4606errout_ifa:
4607 in6_ifa_put(ifa);
4608errout:
4609 return err;
4610}
4611
4612static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4613{
4614 struct sk_buff *skb;
4615 struct net *net = dev_net(ifa->idev->dev);
4616 int err = -ENOBUFS;
4617
4618 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4619 if (!skb)
4620 goto errout;
4621
4622 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4623 if (err < 0) {
4624 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4625 WARN_ON(err == -EMSGSIZE);
4626 kfree_skb(skb);
4627 goto errout;
4628 }
4629 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4630 return;
4631errout:
4632 if (err < 0)
4633 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4634}
4635
4636static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4637 __s32 *array, int bytes)
4638{
4639 BUG_ON(bytes < (DEVCONF_MAX * 4));
4640
4641 memset(array, 0, bytes);
4642 array[DEVCONF_FORWARDING] = cnf->forwarding;
4643 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4644 array[DEVCONF_MTU6] = cnf->mtu6;
4645 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4646 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4647 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4648 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4649 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4650 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4651 jiffies_to_msecs(cnf->rtr_solicit_interval);
4652 array[DEVCONF_RTR_SOLICIT_DELAY] =
4653 jiffies_to_msecs(cnf->rtr_solicit_delay);
4654 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4655 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4656 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4657 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4658 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4659 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4660 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4661 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4662 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4663 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4664 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4665 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4666 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4667 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4668#ifdef CONFIG_IPV6_ROUTER_PREF
4669 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4670 array[DEVCONF_RTR_PROBE_INTERVAL] =
4671 jiffies_to_msecs(cnf->rtr_probe_interval);
4672#ifdef CONFIG_IPV6_ROUTE_INFO
4673 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4674#endif
4675#endif
4676 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4677 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4678#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4679 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4680 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4681#endif
4682#ifdef CONFIG_IPV6_MROUTE
4683 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4684#endif
4685 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4686 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4687 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4688 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4689 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4690 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4691 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4692 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4693 /* we omit DEVCONF_STABLE_SECRET for now */
4694 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4695}
4696
4697static inline size_t inet6_ifla6_size(void)
4698{
4699 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4700 + nla_total_size(sizeof(struct ifla_cacheinfo))
4701 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4702 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4703 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4704 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4705}
4706
4707static inline size_t inet6_if_nlmsg_size(void)
4708{
4709 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4710 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4711 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4712 + nla_total_size(4) /* IFLA_MTU */
4713 + nla_total_size(4) /* IFLA_LINK */
4714 + nla_total_size(1) /* IFLA_OPERSTATE */
4715 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4716}
4717
4718static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4719 int items, int bytes)
4720{
4721 int i;
4722 int pad = bytes - sizeof(u64) * items;
4723 BUG_ON(pad < 0);
4724
4725 /* Use put_unaligned() because stats may not be aligned for u64. */
4726 put_unaligned(items, &stats[0]);
4727 for (i = 1; i < items; i++)
4728 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4729
4730 memset(&stats[items], 0, pad);
4731}
4732
4733static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4734 int bytes, size_t syncpoff)
4735{
4736 int i, c;
4737 u64 buff[IPSTATS_MIB_MAX];
4738 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4739
4740 BUG_ON(pad < 0);
4741
4742 memset(buff, 0, sizeof(buff));
4743 buff[0] = IPSTATS_MIB_MAX;
4744
4745 for_each_possible_cpu(c) {
4746 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4747 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4748 }
4749
4750 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4751 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4752}
4753
4754static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4755 int bytes)
4756{
4757 switch (attrtype) {
4758 case IFLA_INET6_STATS:
4759 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4760 offsetof(struct ipstats_mib, syncp));
4761 break;
4762 case IFLA_INET6_ICMP6STATS:
4763 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4764 break;
4765 }
4766}
4767
4768static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4769 u32 ext_filter_mask)
4770{
4771 struct nlattr *nla;
4772 struct ifla_cacheinfo ci;
4773
4774 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4775 goto nla_put_failure;
4776 ci.max_reasm_len = IPV6_MAXPLEN;
4777 ci.tstamp = cstamp_delta(idev->tstamp);
4778 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4779 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4780 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4781 goto nla_put_failure;
4782 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4783 if (!nla)
4784 goto nla_put_failure;
4785 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4786
4787 /* XXX - MC not implemented */
4788
4789 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4790 return 0;
4791
4792 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4793 if (!nla)
4794 goto nla_put_failure;
4795 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4796
4797 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4798 if (!nla)
4799 goto nla_put_failure;
4800 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4801
4802 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4803 if (!nla)
4804 goto nla_put_failure;
4805
4806 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4807 goto nla_put_failure;
4808
4809 read_lock_bh(&idev->lock);
4810 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4811 read_unlock_bh(&idev->lock);
4812
4813 return 0;
4814
4815nla_put_failure:
4816 return -EMSGSIZE;
4817}
4818
4819static size_t inet6_get_link_af_size(const struct net_device *dev,
4820 u32 ext_filter_mask)
4821{
4822 if (!__in6_dev_get(dev))
4823 return 0;
4824
4825 return inet6_ifla6_size();
4826}
4827
4828static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4829 u32 ext_filter_mask)
4830{
4831 struct inet6_dev *idev = __in6_dev_get(dev);
4832
4833 if (!idev)
4834 return -ENODATA;
4835
4836 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4837 return -EMSGSIZE;
4838
4839 return 0;
4840}
4841
4842static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4843{
4844 struct inet6_ifaddr *ifp;
4845 struct net_device *dev = idev->dev;
4846 bool update_rs = false;
4847 struct in6_addr ll_addr;
4848
4849 ASSERT_RTNL();
4850
4851 if (!token)
4852 return -EINVAL;
4853 if (ipv6_addr_any(token))
4854 return -EINVAL;
4855 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4856 return -EINVAL;
4857 if (!ipv6_accept_ra(idev))
4858 return -EINVAL;
4859 if (idev->cnf.rtr_solicits <= 0)
4860 return -EINVAL;
4861
4862 write_lock_bh(&idev->lock);
4863
4864 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4865 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4866
4867 write_unlock_bh(&idev->lock);
4868
4869 if (!idev->dead && (idev->if_flags & IF_READY) &&
4870 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4871 IFA_F_OPTIMISTIC)) {
4872
4873 /* If we're not ready, then normal ifup will take care
4874 * of this. Otherwise, we need to request our rs here.
4875 */
4876 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4877 update_rs = true;
4878 }
4879
4880 write_lock_bh(&idev->lock);
4881
4882 if (update_rs) {
4883 idev->if_flags |= IF_RS_SENT;
4884 idev->rs_probes = 1;
4885 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4886 }
4887
4888 /* Well, that's kinda nasty ... */
4889 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4890 spin_lock(&ifp->lock);
4891 if (ifp->tokenized) {
4892 ifp->valid_lft = 0;
4893 ifp->prefered_lft = 0;
4894 }
4895 spin_unlock(&ifp->lock);
4896 }
4897
4898 write_unlock_bh(&idev->lock);
4899 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4900 addrconf_verify_rtnl();
4901 return 0;
4902}
4903
4904static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4905 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4906 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4907};
4908
4909static int inet6_validate_link_af(const struct net_device *dev,
4910 const struct nlattr *nla)
4911{
4912 struct nlattr *tb[IFLA_INET6_MAX + 1];
4913
4914 if (dev && !__in6_dev_get(dev))
4915 return -EAFNOSUPPORT;
4916
4917 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4918}
4919
4920static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4921{
4922 int err = -EINVAL;
4923 struct inet6_dev *idev = __in6_dev_get(dev);
4924 struct nlattr *tb[IFLA_INET6_MAX + 1];
4925
4926 if (!idev)
4927 return -EAFNOSUPPORT;
4928
4929 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4930 BUG();
4931
4932 if (tb[IFLA_INET6_TOKEN]) {
4933 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4934 if (err)
4935 return err;
4936 }
4937
4938 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4939 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4940
4941 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4942 mode != IN6_ADDR_GEN_MODE_NONE &&
4943 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4944 return -EINVAL;
4945
4946 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4947 !idev->cnf.stable_secret.initialized &&
4948 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4949 return -EINVAL;
4950
4951 idev->addr_gen_mode = mode;
4952 err = 0;
4953 }
4954
4955 return err;
4956}
4957
4958static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4959 u32 portid, u32 seq, int event, unsigned int flags)
4960{
4961 struct net_device *dev = idev->dev;
4962 struct ifinfomsg *hdr;
4963 struct nlmsghdr *nlh;
4964 void *protoinfo;
4965
4966 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4967 if (!nlh)
4968 return -EMSGSIZE;
4969
4970 hdr = nlmsg_data(nlh);
4971 hdr->ifi_family = AF_INET6;
4972 hdr->__ifi_pad = 0;
4973 hdr->ifi_type = dev->type;
4974 hdr->ifi_index = dev->ifindex;
4975 hdr->ifi_flags = dev_get_flags(dev);
4976 hdr->ifi_change = 0;
4977
4978 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4979 (dev->addr_len &&
4980 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4981 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4982 (dev->ifindex != dev_get_iflink(dev) &&
4983 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
4984 nla_put_u8(skb, IFLA_OPERSTATE,
4985 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
4986 goto nla_put_failure;
4987 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4988 if (!protoinfo)
4989 goto nla_put_failure;
4990
4991 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
4992 goto nla_put_failure;
4993
4994 nla_nest_end(skb, protoinfo);
4995 nlmsg_end(skb, nlh);
4996 return 0;
4997
4998nla_put_failure:
4999 nlmsg_cancel(skb, nlh);
5000 return -EMSGSIZE;
5001}
5002
5003static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5004{
5005 struct net *net = sock_net(skb->sk);
5006 int h, s_h;
5007 int idx = 0, s_idx;
5008 struct net_device *dev;
5009 struct inet6_dev *idev;
5010 struct hlist_head *head;
5011
5012 s_h = cb->args[0];
5013 s_idx = cb->args[1];
5014
5015 rcu_read_lock();
5016 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5017 idx = 0;
5018 head = &net->dev_index_head[h];
5019 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5020 if (idx < s_idx)
5021 goto cont;
5022 idev = __in6_dev_get(dev);
5023 if (!idev)
5024 goto cont;
5025 if (inet6_fill_ifinfo(skb, idev,
5026 NETLINK_CB(cb->skb).portid,
5027 cb->nlh->nlmsg_seq,
5028 RTM_NEWLINK, NLM_F_MULTI) < 0)
5029 goto out;
5030cont:
5031 idx++;
5032 }
5033 }
5034out:
5035 rcu_read_unlock();
5036 cb->args[1] = idx;
5037 cb->args[0] = h;
5038
5039 return skb->len;
5040}
5041
5042void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5043{
5044 struct sk_buff *skb;
5045 struct net *net = dev_net(idev->dev);
5046 int err = -ENOBUFS;
5047
5048 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5049 if (!skb)
5050 goto errout;
5051
5052 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5053 if (err < 0) {
5054 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5055 WARN_ON(err == -EMSGSIZE);
5056 kfree_skb(skb);
5057 goto errout;
5058 }
5059 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5060 return;
5061errout:
5062 if (err < 0)
5063 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5064}
5065
5066static inline size_t inet6_prefix_nlmsg_size(void)
5067{
5068 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5069 + nla_total_size(sizeof(struct in6_addr))
5070 + nla_total_size(sizeof(struct prefix_cacheinfo));
5071}
5072
5073static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5074 struct prefix_info *pinfo, u32 portid, u32 seq,
5075 int event, unsigned int flags)
5076{
5077 struct prefixmsg *pmsg;
5078 struct nlmsghdr *nlh;
5079 struct prefix_cacheinfo ci;
5080
5081 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5082 if (!nlh)
5083 return -EMSGSIZE;
5084
5085 pmsg = nlmsg_data(nlh);
5086 pmsg->prefix_family = AF_INET6;
5087 pmsg->prefix_pad1 = 0;
5088 pmsg->prefix_pad2 = 0;
5089 pmsg->prefix_ifindex = idev->dev->ifindex;
5090 pmsg->prefix_len = pinfo->prefix_len;
5091 pmsg->prefix_type = pinfo->type;
5092 pmsg->prefix_pad3 = 0;
5093 pmsg->prefix_flags = 0;
5094 if (pinfo->onlink)
5095 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5096 if (pinfo->autoconf)
5097 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5098
5099 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5100 goto nla_put_failure;
5101 ci.preferred_time = ntohl(pinfo->prefered);
5102 ci.valid_time = ntohl(pinfo->valid);
5103 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5104 goto nla_put_failure;
5105 nlmsg_end(skb, nlh);
5106 return 0;
5107
5108nla_put_failure:
5109 nlmsg_cancel(skb, nlh);
5110 return -EMSGSIZE;
5111}
5112
5113static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5114 struct prefix_info *pinfo)
5115{
5116 struct sk_buff *skb;
5117 struct net *net = dev_net(idev->dev);
5118 int err = -ENOBUFS;
5119
5120 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5121 if (!skb)
5122 goto errout;
5123
5124 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5125 if (err < 0) {
5126 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5127 WARN_ON(err == -EMSGSIZE);
5128 kfree_skb(skb);
5129 goto errout;
5130 }
5131 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5132 return;
5133errout:
5134 if (err < 0)
5135 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5136}
5137
5138static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5139{
5140 struct net *net = dev_net(ifp->idev->dev);
5141
5142 if (event)
5143 ASSERT_RTNL();
5144
5145 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5146
5147 switch (event) {
5148 case RTM_NEWADDR:
5149 /*
5150 * If the address was optimistic
5151 * we inserted the route at the start of
5152 * our DAD process, so we don't need
5153 * to do it again
5154 */
5155 if (!rcu_access_pointer(ifp->rt->rt6i_node))
5156 ip6_ins_rt(ifp->rt);
5157 if (ifp->idev->cnf.forwarding)
5158 addrconf_join_anycast(ifp);
5159 if (!ipv6_addr_any(&ifp->peer_addr))
5160 addrconf_prefix_route(&ifp->peer_addr, 128,
5161 ifp->idev->dev, 0, 0);
5162 break;
5163 case RTM_DELADDR:
5164 if (ifp->idev->cnf.forwarding)
5165 addrconf_leave_anycast(ifp);
5166 addrconf_leave_solict(ifp->idev, &ifp->addr);
5167 if (!ipv6_addr_any(&ifp->peer_addr)) {
5168 struct rt6_info *rt;
5169
5170 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5171 ifp->idev->dev, 0, 0);
5172 if (rt)
5173 ip6_del_rt(rt);
5174 }
5175 dst_hold(&ifp->rt->dst);
5176
5177 ip6_del_rt(ifp->rt);
5178
5179 rt_genid_bump_ipv6(net);
5180 break;
5181 }
5182 atomic_inc(&net->ipv6.dev_addr_genid);
5183}
5184
5185static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5186{
5187 rcu_read_lock_bh();
5188 if (likely(ifp->idev->dead == 0))
5189 __ipv6_ifa_notify(event, ifp);
5190 rcu_read_unlock_bh();
5191}
5192
5193#ifdef CONFIG_SYSCTL
5194
5195static
5196int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5197 void __user *buffer, size_t *lenp, loff_t *ppos)
5198{
5199 int *valp = ctl->data;
5200 int val = *valp;
5201 loff_t pos = *ppos;
5202 struct ctl_table lctl;
5203 int ret;
5204
5205 /*
5206 * ctl->data points to idev->cnf.forwarding, we should
5207 * not modify it until we get the rtnl lock.
5208 */
5209 lctl = *ctl;
5210 lctl.data = &val;
5211
5212 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5213
5214 if (write)
5215 ret = addrconf_fixup_forwarding(ctl, valp, val);
5216 if (ret)
5217 *ppos = pos;
5218 return ret;
5219}
5220
5221static
5222int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5223 void __user *buffer, size_t *lenp, loff_t *ppos)
5224{
5225 struct inet6_dev *idev = ctl->extra1;
5226 int min_mtu = IPV6_MIN_MTU;
5227 struct ctl_table lctl;
5228
5229 lctl = *ctl;
5230 lctl.extra1 = &min_mtu;
5231 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5232
5233 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5234}
5235
5236static void dev_disable_change(struct inet6_dev *idev)
5237{
5238 struct netdev_notifier_info info;
5239
5240 if (!idev || !idev->dev)
5241 return;
5242
5243 netdev_notifier_info_init(&info, idev->dev);
5244 if (idev->cnf.disable_ipv6)
5245 addrconf_notify(NULL, NETDEV_DOWN, &info);
5246 else
5247 addrconf_notify(NULL, NETDEV_UP, &info);
5248}
5249
5250static void addrconf_disable_change(struct net *net, __s32 newf)
5251{
5252 struct net_device *dev;
5253 struct inet6_dev *idev;
5254
5255 for_each_netdev(net, dev) {
5256 idev = __in6_dev_get(dev);
5257 if (idev) {
5258 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5259 idev->cnf.disable_ipv6 = newf;
5260 if (changed)
5261 dev_disable_change(idev);
5262 }
5263 }
5264}
5265
5266static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5267{
5268 struct net *net;
5269 int old;
5270
5271 if (!rtnl_trylock())
5272 return restart_syscall();
5273
5274 net = (struct net *)table->extra2;
5275 old = *p;
5276 *p = newf;
5277
5278 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5279 rtnl_unlock();
5280 return 0;
5281 }
5282
5283 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5284 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5285 addrconf_disable_change(net, newf);
5286 } else if ((!newf) ^ (!old))
5287 dev_disable_change((struct inet6_dev *)table->extra1);
5288
5289 rtnl_unlock();
5290 return 0;
5291}
5292
5293static
5294int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5295 void __user *buffer, size_t *lenp, loff_t *ppos)
5296{
5297 int *valp = ctl->data;
5298 int val = *valp;
5299 loff_t pos = *ppos;
5300 struct ctl_table lctl;
5301 int ret;
5302
5303 /*
5304 * ctl->data points to idev->cnf.disable_ipv6, we should
5305 * not modify it until we get the rtnl lock.
5306 */
5307 lctl = *ctl;
5308 lctl.data = &val;
5309
5310 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5311
5312 if (write)
5313 ret = addrconf_disable_ipv6(ctl, valp, val);
5314 if (ret)
5315 *ppos = pos;
5316 return ret;
5317}
5318
5319static
5320int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5321 void __user *buffer, size_t *lenp, loff_t *ppos)
5322{
5323 int *valp = ctl->data;
5324 int ret;
5325 int old, new;
5326
5327 old = *valp;
5328 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5329 new = *valp;
5330
5331 if (write && old != new) {
5332 struct net *net = ctl->extra2;
5333
5334 if (!rtnl_trylock())
5335 return restart_syscall();
5336
5337 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5338 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5339 NETCONFA_IFINDEX_DEFAULT,
5340 net->ipv6.devconf_dflt);
5341 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5342 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5343 NETCONFA_IFINDEX_ALL,
5344 net->ipv6.devconf_all);
5345 else {
5346 struct inet6_dev *idev = ctl->extra1;
5347
5348 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5349 idev->dev->ifindex,
5350 &idev->cnf);
5351 }
5352 rtnl_unlock();
5353 }
5354
5355 return ret;
5356}
5357
5358static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5359 void __user *buffer, size_t *lenp,
5360 loff_t *ppos)
5361{
5362 int err;
5363 struct in6_addr addr;
5364 char str[IPV6_MAX_STRLEN];
5365 struct ctl_table lctl = *ctl;
5366 struct net *net = ctl->extra2;
5367 struct ipv6_stable_secret *secret = ctl->data;
5368
5369 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5370 return -EIO;
5371
5372 lctl.maxlen = IPV6_MAX_STRLEN;
5373 lctl.data = str;
5374
5375 if (!rtnl_trylock())
5376 return restart_syscall();
5377
5378 if (!write && !secret->initialized) {
5379 err = -EIO;
5380 goto out;
5381 }
5382
5383 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5384 if (err >= sizeof(str)) {
5385 err = -EIO;
5386 goto out;
5387 }
5388
5389 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5390 if (err || !write)
5391 goto out;
5392
5393 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5394 err = -EIO;
5395 goto out;
5396 }
5397
5398 secret->initialized = true;
5399 secret->secret = addr;
5400
5401 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5402 struct net_device *dev;
5403
5404 for_each_netdev(net, dev) {
5405 struct inet6_dev *idev = __in6_dev_get(dev);
5406
5407 if (idev) {
5408 idev->addr_gen_mode =
5409 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5410 }
5411 }
5412 } else {
5413 struct inet6_dev *idev = ctl->extra1;
5414
5415 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5416 }
5417
5418out:
5419 rtnl_unlock();
5420
5421 return err;
5422}
5423
5424static
5425int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5426 int write,
5427 void __user *buffer,
5428 size_t *lenp,
5429 loff_t *ppos)
5430{
5431 int *valp = ctl->data;
5432 int val = *valp;
5433 loff_t pos = *ppos;
5434 struct ctl_table lctl;
5435 int ret;
5436
5437 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5438 * we should not modify it until we get the rtnl lock.
5439 */
5440 lctl = *ctl;
5441 lctl.data = &val;
5442
5443 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5444
5445 if (write)
5446 ret = addrconf_fixup_linkdown(ctl, valp, val);
5447 if (ret)
5448 *ppos = pos;
5449 return ret;
5450}
5451
5452static struct addrconf_sysctl_table
5453{
5454 struct ctl_table_header *sysctl_header;
5455 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5456} addrconf_sysctl __read_mostly = {
5457 .sysctl_header = NULL,
5458 .addrconf_vars = {
5459 {
5460 .procname = "forwarding",
5461 .data = &ipv6_devconf.forwarding,
5462 .maxlen = sizeof(int),
5463 .mode = 0644,
5464 .proc_handler = addrconf_sysctl_forward,
5465 },
5466 {
5467 .procname = "hop_limit",
5468 .data = &ipv6_devconf.hop_limit,
5469 .maxlen = sizeof(int),
5470 .mode = 0644,
5471 .proc_handler = proc_dointvec,
5472 },
5473 {
5474 .procname = "mtu",
5475 .data = &ipv6_devconf.mtu6,
5476 .maxlen = sizeof(int),
5477 .mode = 0644,
5478 .proc_handler = addrconf_sysctl_mtu,
5479 },
5480 {
5481 .procname = "accept_ra",
5482 .data = &ipv6_devconf.accept_ra,
5483 .maxlen = sizeof(int),
5484 .mode = 0644,
5485 .proc_handler = proc_dointvec,
5486 },
5487 {
5488 .procname = "accept_redirects",
5489 .data = &ipv6_devconf.accept_redirects,
5490 .maxlen = sizeof(int),
5491 .mode = 0644,
5492 .proc_handler = proc_dointvec,
5493 },
5494 {
5495 .procname = "autoconf",
5496 .data = &ipv6_devconf.autoconf,
5497 .maxlen = sizeof(int),
5498 .mode = 0644,
5499 .proc_handler = proc_dointvec,
5500 },
5501 {
5502 .procname = "dad_transmits",
5503 .data = &ipv6_devconf.dad_transmits,
5504 .maxlen = sizeof(int),
5505 .mode = 0644,
5506 .proc_handler = proc_dointvec,
5507 },
5508 {
5509 .procname = "router_solicitations",
5510 .data = &ipv6_devconf.rtr_solicits,
5511 .maxlen = sizeof(int),
5512 .mode = 0644,
5513 .proc_handler = proc_dointvec,
5514 },
5515 {
5516 .procname = "router_solicitation_interval",
5517 .data = &ipv6_devconf.rtr_solicit_interval,
5518 .maxlen = sizeof(int),
5519 .mode = 0644,
5520 .proc_handler = proc_dointvec_jiffies,
5521 },
5522 {
5523 .procname = "router_solicitation_delay",
5524 .data = &ipv6_devconf.rtr_solicit_delay,
5525 .maxlen = sizeof(int),
5526 .mode = 0644,
5527 .proc_handler = proc_dointvec_jiffies,
5528 },
5529 {
5530 .procname = "force_mld_version",
5531 .data = &ipv6_devconf.force_mld_version,
5532 .maxlen = sizeof(int),
5533 .mode = 0644,
5534 .proc_handler = proc_dointvec,
5535 },
5536 {
5537 .procname = "mldv1_unsolicited_report_interval",
5538 .data =
5539 &ipv6_devconf.mldv1_unsolicited_report_interval,
5540 .maxlen = sizeof(int),
5541 .mode = 0644,
5542 .proc_handler = proc_dointvec_ms_jiffies,
5543 },
5544 {
5545 .procname = "mldv2_unsolicited_report_interval",
5546 .data =
5547 &ipv6_devconf.mldv2_unsolicited_report_interval,
5548 .maxlen = sizeof(int),
5549 .mode = 0644,
5550 .proc_handler = proc_dointvec_ms_jiffies,
5551 },
5552 {
5553 .procname = "use_tempaddr",
5554 .data = &ipv6_devconf.use_tempaddr,
5555 .maxlen = sizeof(int),
5556 .mode = 0644,
5557 .proc_handler = proc_dointvec,
5558 },
5559 {
5560 .procname = "temp_valid_lft",
5561 .data = &ipv6_devconf.temp_valid_lft,
5562 .maxlen = sizeof(int),
5563 .mode = 0644,
5564 .proc_handler = proc_dointvec,
5565 },
5566 {
5567 .procname = "temp_prefered_lft",
5568 .data = &ipv6_devconf.temp_prefered_lft,
5569 .maxlen = sizeof(int),
5570 .mode = 0644,
5571 .proc_handler = proc_dointvec,
5572 },
5573 {
5574 .procname = "regen_max_retry",
5575 .data = &ipv6_devconf.regen_max_retry,
5576 .maxlen = sizeof(int),
5577 .mode = 0644,
5578 .proc_handler = proc_dointvec,
5579 },
5580 {
5581 .procname = "max_desync_factor",
5582 .data = &ipv6_devconf.max_desync_factor,
5583 .maxlen = sizeof(int),
5584 .mode = 0644,
5585 .proc_handler = proc_dointvec,
5586 },
5587 {
5588 .procname = "max_addresses",
5589 .data = &ipv6_devconf.max_addresses,
5590 .maxlen = sizeof(int),
5591 .mode = 0644,
5592 .proc_handler = proc_dointvec,
5593 },
5594 {
5595 .procname = "accept_ra_defrtr",
5596 .data = &ipv6_devconf.accept_ra_defrtr,
5597 .maxlen = sizeof(int),
5598 .mode = 0644,
5599 .proc_handler = proc_dointvec,
5600 },
5601 {
5602 .procname = "accept_ra_min_hop_limit",
5603 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5604 .maxlen = sizeof(int),
5605 .mode = 0644,
5606 .proc_handler = proc_dointvec,
5607 },
5608 {
5609 .procname = "accept_ra_pinfo",
5610 .data = &ipv6_devconf.accept_ra_pinfo,
5611 .maxlen = sizeof(int),
5612 .mode = 0644,
5613 .proc_handler = proc_dointvec,
5614 },
5615#ifdef CONFIG_IPV6_ROUTER_PREF
5616 {
5617 .procname = "accept_ra_rtr_pref",
5618 .data = &ipv6_devconf.accept_ra_rtr_pref,
5619 .maxlen = sizeof(int),
5620 .mode = 0644,
5621 .proc_handler = proc_dointvec,
5622 },
5623 {
5624 .procname = "router_probe_interval",
5625 .data = &ipv6_devconf.rtr_probe_interval,
5626 .maxlen = sizeof(int),
5627 .mode = 0644,
5628 .proc_handler = proc_dointvec_jiffies,
5629 },
5630#ifdef CONFIG_IPV6_ROUTE_INFO
5631 {
5632 .procname = "accept_ra_rt_info_max_plen",
5633 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5634 .maxlen = sizeof(int),
5635 .mode = 0644,
5636 .proc_handler = proc_dointvec,
5637 },
5638#endif
5639#endif
5640 {
5641 .procname = "proxy_ndp",
5642 .data = &ipv6_devconf.proxy_ndp,
5643 .maxlen = sizeof(int),
5644 .mode = 0644,
5645 .proc_handler = addrconf_sysctl_proxy_ndp,
5646 },
5647 {
5648 .procname = "accept_source_route",
5649 .data = &ipv6_devconf.accept_source_route,
5650 .maxlen = sizeof(int),
5651 .mode = 0644,
5652 .proc_handler = proc_dointvec,
5653 },
5654#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5655 {
5656 .procname = "optimistic_dad",
5657 .data = &ipv6_devconf.optimistic_dad,
5658 .maxlen = sizeof(int),
5659 .mode = 0644,
5660 .proc_handler = proc_dointvec,
5661
5662 },
5663 {
5664 .procname = "use_optimistic",
5665 .data = &ipv6_devconf.use_optimistic,
5666 .maxlen = sizeof(int),
5667 .mode = 0644,
5668 .proc_handler = proc_dointvec,
5669
5670 },
5671#endif
5672#ifdef CONFIG_IPV6_MROUTE
5673 {
5674 .procname = "mc_forwarding",
5675 .data = &ipv6_devconf.mc_forwarding,
5676 .maxlen = sizeof(int),
5677 .mode = 0444,
5678 .proc_handler = proc_dointvec,
5679 },
5680#endif
5681 {
5682 .procname = "disable_ipv6",
5683 .data = &ipv6_devconf.disable_ipv6,
5684 .maxlen = sizeof(int),
5685 .mode = 0644,
5686 .proc_handler = addrconf_sysctl_disable,
5687 },
5688 {
5689 .procname = "accept_dad",
5690 .data = &ipv6_devconf.accept_dad,
5691 .maxlen = sizeof(int),
5692 .mode = 0644,
5693 .proc_handler = proc_dointvec,
5694 },
5695 {
5696 .procname = "force_tllao",
5697 .data = &ipv6_devconf.force_tllao,
5698 .maxlen = sizeof(int),
5699 .mode = 0644,
5700 .proc_handler = proc_dointvec
5701 },
5702 {
5703 .procname = "ndisc_notify",
5704 .data = &ipv6_devconf.ndisc_notify,
5705 .maxlen = sizeof(int),
5706 .mode = 0644,
5707 .proc_handler = proc_dointvec
5708 },
5709 {
5710 .procname = "suppress_frag_ndisc",
5711 .data = &ipv6_devconf.suppress_frag_ndisc,
5712 .maxlen = sizeof(int),
5713 .mode = 0644,
5714 .proc_handler = proc_dointvec
5715 },
5716 {
5717 .procname = "accept_ra_from_local",
5718 .data = &ipv6_devconf.accept_ra_from_local,
5719 .maxlen = sizeof(int),
5720 .mode = 0644,
5721 .proc_handler = proc_dointvec,
5722 },
5723 {
5724 .procname = "accept_ra_mtu",
5725 .data = &ipv6_devconf.accept_ra_mtu,
5726 .maxlen = sizeof(int),
5727 .mode = 0644,
5728 .proc_handler = proc_dointvec,
5729 },
5730 {
5731 .procname = "stable_secret",
5732 .data = &ipv6_devconf.stable_secret,
5733 .maxlen = IPV6_MAX_STRLEN,
5734 .mode = 0600,
5735 .proc_handler = addrconf_sysctl_stable_secret,
5736 },
5737 {
5738 .procname = "use_oif_addrs_only",
5739 .data = &ipv6_devconf.use_oif_addrs_only,
5740 .maxlen = sizeof(int),
5741 .mode = 0644,
5742 .proc_handler = proc_dointvec,
5743 },
5744 {
5745 .procname = "ignore_routes_with_linkdown",
5746 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5747 .maxlen = sizeof(int),
5748 .mode = 0644,
5749 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5750 },
5751 {
5752 /* sentinel */
5753 }
5754 },
5755};
5756
5757static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5758 struct inet6_dev *idev, struct ipv6_devconf *p)
5759{
5760 int i;
5761 struct addrconf_sysctl_table *t;
5762 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5763
5764 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5765 if (!t)
5766 goto out;
5767
5768 for (i = 0; t->addrconf_vars[i].data; i++) {
5769 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5770 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5771 t->addrconf_vars[i].extra2 = net;
5772 }
5773
5774 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5775
5776 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5777 if (!t->sysctl_header)
5778 goto free;
5779
5780 p->sysctl = t;
5781 return 0;
5782
5783free:
5784 kfree(t);
5785out:
5786 return -ENOBUFS;
5787}
5788
5789static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5790{
5791 struct addrconf_sysctl_table *t;
5792
5793 if (!p->sysctl)
5794 return;
5795
5796 t = p->sysctl;
5797 p->sysctl = NULL;
5798 unregister_net_sysctl_table(t->sysctl_header);
5799 kfree(t);
5800}
5801
5802static int addrconf_sysctl_register(struct inet6_dev *idev)
5803{
5804 int err;
5805
5806 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5807 return -EINVAL;
5808
5809 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5810 &ndisc_ifinfo_sysctl_change);
5811 if (err)
5812 return err;
5813 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5814 idev, &idev->cnf);
5815 if (err)
5816 neigh_sysctl_unregister(idev->nd_parms);
5817
5818 return err;
5819}
5820
5821static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5822{
5823 __addrconf_sysctl_unregister(&idev->cnf);
5824 neigh_sysctl_unregister(idev->nd_parms);
5825}
5826
5827
5828#endif
5829
5830static int __net_init addrconf_init_net(struct net *net)
5831{
5832 int err = -ENOMEM;
5833 struct ipv6_devconf *all, *dflt;
5834
5835 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5836 if (!all)
5837 goto err_alloc_all;
5838
5839 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5840 if (!dflt)
5841 goto err_alloc_dflt;
5842
5843 /* these will be inherited by all namespaces */
5844 dflt->autoconf = ipv6_defaults.autoconf;
5845 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5846
5847 dflt->stable_secret.initialized = false;
5848 all->stable_secret.initialized = false;
5849
5850 net->ipv6.devconf_all = all;
5851 net->ipv6.devconf_dflt = dflt;
5852
5853#ifdef CONFIG_SYSCTL
5854 err = __addrconf_sysctl_register(net, "all", NULL, all);
5855 if (err < 0)
5856 goto err_reg_all;
5857
5858 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5859 if (err < 0)
5860 goto err_reg_dflt;
5861#endif
5862 return 0;
5863
5864#ifdef CONFIG_SYSCTL
5865err_reg_dflt:
5866 __addrconf_sysctl_unregister(all);
5867err_reg_all:
5868 kfree(dflt);
5869#endif
5870err_alloc_dflt:
5871 kfree(all);
5872err_alloc_all:
5873 return err;
5874}
5875
5876static void __net_exit addrconf_exit_net(struct net *net)
5877{
5878#ifdef CONFIG_SYSCTL
5879 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5880 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5881#endif
5882 kfree(net->ipv6.devconf_dflt);
5883 kfree(net->ipv6.devconf_all);
5884}
5885
5886static struct pernet_operations addrconf_ops = {
5887 .init = addrconf_init_net,
5888 .exit = addrconf_exit_net,
5889};
5890
5891static struct rtnl_af_ops inet6_ops __read_mostly = {
5892 .family = AF_INET6,
5893 .fill_link_af = inet6_fill_link_af,
5894 .get_link_af_size = inet6_get_link_af_size,
5895 .validate_link_af = inet6_validate_link_af,
5896 .set_link_af = inet6_set_link_af,
5897};
5898
5899/*
5900 * Init / cleanup code
5901 */
5902
5903int __init addrconf_init(void)
5904{
5905 struct inet6_dev *idev;
5906 int i, err;
5907
5908 err = ipv6_addr_label_init();
5909 if (err < 0) {
5910 pr_crit("%s: cannot initialize default policy table: %d\n",
5911 __func__, err);
5912 goto out;
5913 }
5914
5915 err = register_pernet_subsys(&addrconf_ops);
5916 if (err < 0)
5917 goto out_addrlabel;
5918
5919 addrconf_wq = create_workqueue("ipv6_addrconf");
5920 if (!addrconf_wq) {
5921 err = -ENOMEM;
5922 goto out_nowq;
5923 }
5924
5925 /* The addrconf netdev notifier requires that loopback_dev
5926 * has it's ipv6 private information allocated and setup
5927 * before it can bring up and give link-local addresses
5928 * to other devices which are up.
5929 *
5930 * Unfortunately, loopback_dev is not necessarily the first
5931 * entry in the global dev_base list of net devices. In fact,
5932 * it is likely to be the very last entry on that list.
5933 * So this causes the notifier registry below to try and
5934 * give link-local addresses to all devices besides loopback_dev
5935 * first, then loopback_dev, which cases all the non-loopback_dev
5936 * devices to fail to get a link-local address.
5937 *
5938 * So, as a temporary fix, allocate the ipv6 structure for
5939 * loopback_dev first by hand.
5940 * Longer term, all of the dependencies ipv6 has upon the loopback
5941 * device and it being up should be removed.
5942 */
5943 rtnl_lock();
5944 idev = ipv6_add_dev(init_net.loopback_dev);
5945 rtnl_unlock();
5946 if (IS_ERR(idev)) {
5947 err = PTR_ERR(idev);
5948 goto errlo;
5949 }
5950
5951 ip6_route_init_special_entries();
5952
5953 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5954 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5955
5956 register_netdevice_notifier(&ipv6_dev_notf);
5957
5958 addrconf_verify();
5959
5960 rtnl_af_register(&inet6_ops);
5961
5962 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5963 NULL);
5964 if (err < 0)
5965 goto errout;
5966
5967 /* Only the first call to __rtnl_register can fail */
5968 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5969 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5970 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5971 inet6_dump_ifaddr, NULL);
5972 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5973 inet6_dump_ifmcaddr, NULL);
5974 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5975 inet6_dump_ifacaddr, NULL);
5976 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5977 inet6_netconf_dump_devconf, NULL);
5978
5979 ipv6_addr_label_rtnl_register();
5980
5981 return 0;
5982errout:
5983 rtnl_af_unregister(&inet6_ops);
5984 unregister_netdevice_notifier(&ipv6_dev_notf);
5985errlo:
5986 destroy_workqueue(addrconf_wq);
5987out_nowq:
5988 unregister_pernet_subsys(&addrconf_ops);
5989out_addrlabel:
5990 ipv6_addr_label_cleanup();
5991out:
5992 return err;
5993}
5994
5995void addrconf_cleanup(void)
5996{
5997 struct net_device *dev;
5998 int i;
5999
6000 unregister_netdevice_notifier(&ipv6_dev_notf);
6001 unregister_pernet_subsys(&addrconf_ops);
6002 ipv6_addr_label_cleanup();
6003
6004 rtnl_lock();
6005
6006 __rtnl_af_unregister(&inet6_ops);
6007
6008 /* clean dev list */
6009 for_each_netdev(&init_net, dev) {
6010 if (__in6_dev_get(dev) == NULL)
6011 continue;
6012 addrconf_ifdown(dev, 1);
6013 }
6014 addrconf_ifdown(init_net.loopback_dev, 2);
6015
6016 /*
6017 * Check hash table.
6018 */
6019 spin_lock_bh(&addrconf_hash_lock);
6020 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6021 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6022 spin_unlock_bh(&addrconf_hash_lock);
6023 cancel_delayed_work(&addr_chk_work);
6024 rtnl_unlock();
6025
6026 destroy_workqueue(addrconf_wq);
6027}