1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37#define pr_fmt(fmt) "IPv6: " fmt
38
39#include <linux/errno.h>
40#include <linux/types.h>
41#include <linux/kernel.h>
42#include <linux/sched/signal.h>
43#include <linux/socket.h>
44#include <linux/sockios.h>
45#include <linux/net.h>
46#include <linux/inet.h>
47#include <linux/in6.h>
48#include <linux/netdevice.h>
49#include <linux/if_addr.h>
50#include <linux/if_arp.h>
51#include <linux/if_arcnet.h>
52#include <linux/if_infiniband.h>
53#include <linux/route.h>
54#include <linux/inetdevice.h>
55#include <linux/init.h>
56#include <linux/slab.h>
57#ifdef CONFIG_SYSCTL
58#include <linux/sysctl.h>
59#endif
60#include <linux/capability.h>
61#include <linux/delay.h>
62#include <linux/notifier.h>
63#include <linux/string.h>
64#include <linux/hash.h>
65
66#include <net/net_namespace.h>
67#include <net/sock.h>
68#include <net/snmp.h>
69
70#include <net/6lowpan.h>
71#include <net/firewire.h>
72#include <net/ipv6.h>
73#include <net/protocol.h>
74#include <net/ndisc.h>
75#include <net/ip6_route.h>
76#include <net/addrconf.h>
77#include <net/tcp.h>
78#include <net/ip.h>
79#include <net/netlink.h>
80#include <net/pkt_sched.h>
81#include <net/l3mdev.h>
82#include <linux/if_tunnel.h>
83#include <linux/rtnetlink.h>
84#include <linux/netconf.h>
85#include <linux/random.h>
86#include <linux/uaccess.h>
87#include <asm/unaligned.h>
88
89#include <linux/proc_fs.h>
90#include <linux/seq_file.h>
91#include <linux/export.h>
92
93#define INFINITY_LIFE_TIME 0xFFFFFFFF
94
95#define IPV6_MAX_STRLEN \
96 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
97
98static inline u32 cstamp_delta(unsigned long cstamp)
99{
100 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
101}
102
103static inline s32 rfc3315_s14_backoff_init(s32 irt)
104{
105
106 u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
107 do_div(tmp, 1000000);
108 return (s32)tmp;
109}
110
111static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
112{
113
114 u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
115 do_div(tmp, 1000000);
116 if ((s32)tmp > mrt) {
117
118 tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
119 do_div(tmp, 1000000);
120 }
121 return (s32)tmp;
122}
123
124#ifdef CONFIG_SYSCTL
125static int addrconf_sysctl_register(struct inet6_dev *idev);
126static void addrconf_sysctl_unregister(struct inet6_dev *idev);
127#else
128static inline int addrconf_sysctl_register(struct inet6_dev *idev)
129{
130 return 0;
131}
132
133static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
134{
135}
136#endif
137
138static void ipv6_gen_rnd_iid(struct in6_addr *addr);
139
140static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
141static int ipv6_count_addresses(const struct inet6_dev *idev);
142static int ipv6_generate_stable_address(struct in6_addr *addr,
143 u8 dad_count,
144 const struct inet6_dev *idev);
145
146#define IN6_ADDR_HSIZE_SHIFT 8
147#define IN6_ADDR_HSIZE (1 << IN6_ADDR_HSIZE_SHIFT)
148
149
150
151static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
152static DEFINE_SPINLOCK(addrconf_hash_lock);
153
154static void addrconf_verify(void);
155static void addrconf_verify_rtnl(void);
156static void addrconf_verify_work(struct work_struct *);
157
158static struct workqueue_struct *addrconf_wq;
159static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
160
161static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
162static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
163
164static void addrconf_type_change(struct net_device *dev,
165 unsigned long event);
166static int addrconf_ifdown(struct net_device *dev, int how);
167
168static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
169 int plen,
170 const struct net_device *dev,
171 u32 flags, u32 noflags,
172 bool no_gw);
173
174static void addrconf_dad_start(struct inet6_ifaddr *ifp);
175static void addrconf_dad_work(struct work_struct *w);
176static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
177 bool send_na);
178static void addrconf_dad_run(struct inet6_dev *idev, bool restart);
179static void addrconf_rs_timer(struct timer_list *t);
180static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
181static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
182
183static void inet6_prefix_notify(int event, struct inet6_dev *idev,
184 struct prefix_info *pinfo);
185
186static struct ipv6_devconf ipv6_devconf __read_mostly = {
187 .forwarding = 0,
188 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
189 .mtu6 = IPV6_MIN_MTU,
190 .accept_ra = 1,
191 .accept_redirects = 1,
192 .autoconf = 1,
193 .force_mld_version = 0,
194 .mldv1_unsolicited_report_interval = 10 * HZ,
195 .mldv2_unsolicited_report_interval = HZ,
196 .dad_transmits = 1,
197 .rtr_solicits = MAX_RTR_SOLICITATIONS,
198 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
199 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
200 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
201 .use_tempaddr = 0,
202 .temp_valid_lft = TEMP_VALID_LIFETIME,
203 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
204 .regen_max_retry = REGEN_MAX_RETRY,
205 .max_desync_factor = MAX_DESYNC_FACTOR,
206 .max_addresses = IPV6_MAX_ADDRESSES,
207 .accept_ra_defrtr = 1,
208 .accept_ra_from_local = 0,
209 .accept_ra_min_hop_limit= 1,
210 .accept_ra_pinfo = 1,
211#ifdef CONFIG_IPV6_ROUTER_PREF
212 .accept_ra_rtr_pref = 1,
213 .rtr_probe_interval = 60 * HZ,
214#ifdef CONFIG_IPV6_ROUTE_INFO
215 .accept_ra_rt_info_min_plen = 0,
216 .accept_ra_rt_info_max_plen = 0,
217#endif
218#endif
219 .proxy_ndp = 0,
220 .accept_source_route = 0,
221 .disable_ipv6 = 0,
222 .accept_dad = 0,
223 .suppress_frag_ndisc = 1,
224 .accept_ra_mtu = 1,
225 .stable_secret = {
226 .initialized = false,
227 },
228 .use_oif_addrs_only = 0,
229 .ignore_routes_with_linkdown = 0,
230 .keep_addr_on_down = 0,
231 .seg6_enabled = 0,
232#ifdef CONFIG_IPV6_SEG6_HMAC
233 .seg6_require_hmac = 0,
234#endif
235 .enhanced_dad = 1,
236 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
237 .disable_policy = 0,
238 .rpl_seg_enabled = 0,
239};
240
241static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
242 .forwarding = 0,
243 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
244 .mtu6 = IPV6_MIN_MTU,
245 .accept_ra = 1,
246 .accept_redirects = 1,
247 .autoconf = 1,
248 .force_mld_version = 0,
249 .mldv1_unsolicited_report_interval = 10 * HZ,
250 .mldv2_unsolicited_report_interval = HZ,
251 .dad_transmits = 1,
252 .rtr_solicits = MAX_RTR_SOLICITATIONS,
253 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
254 .rtr_solicit_max_interval = RTR_SOLICITATION_MAX_INTERVAL,
255 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
256 .use_tempaddr = 0,
257 .temp_valid_lft = TEMP_VALID_LIFETIME,
258 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
259 .regen_max_retry = REGEN_MAX_RETRY,
260 .max_desync_factor = MAX_DESYNC_FACTOR,
261 .max_addresses = IPV6_MAX_ADDRESSES,
262 .accept_ra_defrtr = 1,
263 .accept_ra_from_local = 0,
264 .accept_ra_min_hop_limit= 1,
265 .accept_ra_pinfo = 1,
266#ifdef CONFIG_IPV6_ROUTER_PREF
267 .accept_ra_rtr_pref = 1,
268 .rtr_probe_interval = 60 * HZ,
269#ifdef CONFIG_IPV6_ROUTE_INFO
270 .accept_ra_rt_info_min_plen = 0,
271 .accept_ra_rt_info_max_plen = 0,
272#endif
273#endif
274 .proxy_ndp = 0,
275 .accept_source_route = 0,
276 .disable_ipv6 = 0,
277 .accept_dad = 1,
278 .suppress_frag_ndisc = 1,
279 .accept_ra_mtu = 1,
280 .stable_secret = {
281 .initialized = false,
282 },
283 .use_oif_addrs_only = 0,
284 .ignore_routes_with_linkdown = 0,
285 .keep_addr_on_down = 0,
286 .seg6_enabled = 0,
287#ifdef CONFIG_IPV6_SEG6_HMAC
288 .seg6_require_hmac = 0,
289#endif
290 .enhanced_dad = 1,
291 .addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64,
292 .disable_policy = 0,
293 .rpl_seg_enabled = 0,
294};
295
296
297static inline bool addrconf_link_ready(const struct net_device *dev)
298{
299 return netif_oper_up(dev) && !qdisc_tx_is_noop(dev);
300}
301
302static void addrconf_del_rs_timer(struct inet6_dev *idev)
303{
304 if (del_timer(&idev->rs_timer))
305 __in6_dev_put(idev);
306}
307
308static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
309{
310 if (cancel_delayed_work(&ifp->dad_work))
311 __in6_ifa_put(ifp);
312}
313
314static void addrconf_mod_rs_timer(struct inet6_dev *idev,
315 unsigned long when)
316{
317 if (!timer_pending(&idev->rs_timer))
318 in6_dev_hold(idev);
319 mod_timer(&idev->rs_timer, jiffies + when);
320}
321
322static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
323 unsigned long delay)
324{
325 in6_ifa_hold(ifp);
326 if (mod_delayed_work(addrconf_wq, &ifp->dad_work, delay))
327 in6_ifa_put(ifp);
328}
329
330static int snmp6_alloc_dev(struct inet6_dev *idev)
331{
332 int i;
333
334 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
335 if (!idev->stats.ipv6)
336 goto err_ip;
337
338 for_each_possible_cpu(i) {
339 struct ipstats_mib *addrconf_stats;
340 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
341 u64_stats_init(&addrconf_stats->syncp);
342 }
343
344
345 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
346 GFP_KERNEL);
347 if (!idev->stats.icmpv6dev)
348 goto err_icmp;
349 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
350 GFP_KERNEL);
351 if (!idev->stats.icmpv6msgdev)
352 goto err_icmpmsg;
353
354 return 0;
355
356err_icmpmsg:
357 kfree(idev->stats.icmpv6dev);
358err_icmp:
359 free_percpu(idev->stats.ipv6);
360err_ip:
361 return -ENOMEM;
362}
363
364static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
365{
366 struct inet6_dev *ndev;
367 int err = -ENOMEM;
368
369 ASSERT_RTNL();
370
371 if (dev->mtu < IPV6_MIN_MTU)
372 return ERR_PTR(-EINVAL);
373
374 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
375 if (!ndev)
376 return ERR_PTR(err);
377
378 rwlock_init(&ndev->lock);
379 ndev->dev = dev;
380 INIT_LIST_HEAD(&ndev->addr_list);
381 timer_setup(&ndev->rs_timer, addrconf_rs_timer, 0);
382 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
383
384 if (ndev->cnf.stable_secret.initialized)
385 ndev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
386
387 ndev->cnf.mtu6 = dev->mtu;
388 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
389 if (!ndev->nd_parms) {
390 kfree(ndev);
391 return ERR_PTR(err);
392 }
393 if (ndev->cnf.forwarding)
394 dev_disable_lro(dev);
395
396 dev_hold(dev);
397
398 if (snmp6_alloc_dev(ndev) < 0) {
399 netdev_dbg(dev, "%s: cannot allocate memory for statistics\n",
400 __func__);
401 neigh_parms_release(&nd_tbl, ndev->nd_parms);
402 dev_put(dev);
403 kfree(ndev);
404 return ERR_PTR(err);
405 }
406
407 if (snmp6_register_dev(ndev) < 0) {
408 netdev_dbg(dev, "%s: cannot create /proc/net/dev_snmp6/%s\n",
409 __func__, dev->name);
410 goto err_release;
411 }
412
413
414 refcount_set(&ndev->refcnt, 1);
415
416 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
417 ndev->cnf.accept_dad = -1;
418
419#if IS_ENABLED(CONFIG_IPV6_SIT)
420 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
421 pr_info("%s: Disabled Multicast RS\n", dev->name);
422 ndev->cnf.rtr_solicits = 0;
423 }
424#endif
425
426 INIT_LIST_HEAD(&ndev->tempaddr_list);
427 ndev->desync_factor = U32_MAX;
428 if ((dev->flags&IFF_LOOPBACK) ||
429 dev->type == ARPHRD_TUNNEL ||
430 dev->type == ARPHRD_TUNNEL6 ||
431 dev->type == ARPHRD_SIT ||
432 dev->type == ARPHRD_NONE) {
433 ndev->cnf.use_tempaddr = -1;
434 }
435
436 ndev->token = in6addr_any;
437
438 if (netif_running(dev) && addrconf_link_ready(dev))
439 ndev->if_flags |= IF_READY;
440
441 ipv6_mc_init_dev(ndev);
442 ndev->tstamp = jiffies;
443 err = addrconf_sysctl_register(ndev);
444 if (err) {
445 ipv6_mc_destroy_dev(ndev);
446 snmp6_unregister_dev(ndev);
447 goto err_release;
448 }
449
450 rcu_assign_pointer(dev->ip6_ptr, ndev);
451
452
453 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
454
455
456 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
457
458
459 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
460 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
461
462 return ndev;
463
464err_release:
465 neigh_parms_release(&nd_tbl, ndev->nd_parms);
466 ndev->dead = 1;
467 in6_dev_finish_destroy(ndev);
468 return ERR_PTR(err);
469}
470
471static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
472{
473 struct inet6_dev *idev;
474
475 ASSERT_RTNL();
476
477 idev = __in6_dev_get(dev);
478 if (!idev) {
479 idev = ipv6_add_dev(dev);
480 if (IS_ERR(idev))
481 return idev;
482 }
483
484 if (dev->flags&IFF_UP)
485 ipv6_mc_up(idev);
486 return idev;
487}
488
489static int inet6_netconf_msgsize_devconf(int type)
490{
491 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
492 + nla_total_size(4);
493 bool all = false;
494
495 if (type == NETCONFA_ALL)
496 all = true;
497
498 if (all || type == NETCONFA_FORWARDING)
499 size += nla_total_size(4);
500#ifdef CONFIG_IPV6_MROUTE
501 if (all || type == NETCONFA_MC_FORWARDING)
502 size += nla_total_size(4);
503#endif
504 if (all || type == NETCONFA_PROXY_NEIGH)
505 size += nla_total_size(4);
506
507 if (all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
508 size += nla_total_size(4);
509
510 return size;
511}
512
513static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
514 struct ipv6_devconf *devconf, u32 portid,
515 u32 seq, int event, unsigned int flags,
516 int type)
517{
518 struct nlmsghdr *nlh;
519 struct netconfmsg *ncm;
520 bool all = false;
521
522 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
523 flags);
524 if (!nlh)
525 return -EMSGSIZE;
526
527 if (type == NETCONFA_ALL)
528 all = true;
529
530 ncm = nlmsg_data(nlh);
531 ncm->ncm_family = AF_INET6;
532
533 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
534 goto nla_put_failure;
535
536 if (!devconf)
537 goto out;
538
539 if ((all || type == NETCONFA_FORWARDING) &&
540 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
541 goto nla_put_failure;
542#ifdef CONFIG_IPV6_MROUTE
543 if ((all || type == NETCONFA_MC_FORWARDING) &&
544 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
545 devconf->mc_forwarding) < 0)
546 goto nla_put_failure;
547#endif
548 if ((all || type == NETCONFA_PROXY_NEIGH) &&
549 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
550 goto nla_put_failure;
551
552 if ((all || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
553 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
554 devconf->ignore_routes_with_linkdown) < 0)
555 goto nla_put_failure;
556
557out:
558 nlmsg_end(skb, nlh);
559 return 0;
560
561nla_put_failure:
562 nlmsg_cancel(skb, nlh);
563 return -EMSGSIZE;
564}
565
566void inet6_netconf_notify_devconf(struct net *net, int event, int type,
567 int ifindex, struct ipv6_devconf *devconf)
568{
569 struct sk_buff *skb;
570 int err = -ENOBUFS;
571
572 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_KERNEL);
573 if (!skb)
574 goto errout;
575
576 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
577 event, 0, type);
578 if (err < 0) {
579
580 WARN_ON(err == -EMSGSIZE);
581 kfree_skb(skb);
582 goto errout;
583 }
584 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_KERNEL);
585 return;
586errout:
587 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
588}
589
590static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
591 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
592 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
593 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
594 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
595};
596
597static int inet6_netconf_valid_get_req(struct sk_buff *skb,
598 const struct nlmsghdr *nlh,
599 struct nlattr **tb,
600 struct netlink_ext_ack *extack)
601{
602 int i, err;
603
604 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(struct netconfmsg))) {
605 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf get request");
606 return -EINVAL;
607 }
608
609 if (!netlink_strict_get_check(skb))
610 return nlmsg_parse_deprecated(nlh, sizeof(struct netconfmsg),
611 tb, NETCONFA_MAX,
612 devconf_ipv6_policy, extack);
613
614 err = nlmsg_parse_deprecated_strict(nlh, sizeof(struct netconfmsg),
615 tb, NETCONFA_MAX,
616 devconf_ipv6_policy, extack);
617 if (err)
618 return err;
619
620 for (i = 0; i <= NETCONFA_MAX; i++) {
621 if (!tb[i])
622 continue;
623
624 switch (i) {
625 case NETCONFA_IFINDEX:
626 break;
627 default:
628 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in netconf get request");
629 return -EINVAL;
630 }
631 }
632
633 return 0;
634}
635
636static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
637 struct nlmsghdr *nlh,
638 struct netlink_ext_ack *extack)
639{
640 struct net *net = sock_net(in_skb->sk);
641 struct nlattr *tb[NETCONFA_MAX+1];
642 struct inet6_dev *in6_dev = NULL;
643 struct net_device *dev = NULL;
644 struct sk_buff *skb;
645 struct ipv6_devconf *devconf;
646 int ifindex;
647 int err;
648
649 err = inet6_netconf_valid_get_req(in_skb, nlh, tb, extack);
650 if (err < 0)
651 return err;
652
653 if (!tb[NETCONFA_IFINDEX])
654 return -EINVAL;
655
656 err = -EINVAL;
657 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
658 switch (ifindex) {
659 case NETCONFA_IFINDEX_ALL:
660 devconf = net->ipv6.devconf_all;
661 break;
662 case NETCONFA_IFINDEX_DEFAULT:
663 devconf = net->ipv6.devconf_dflt;
664 break;
665 default:
666 dev = dev_get_by_index(net, ifindex);
667 if (!dev)
668 return -EINVAL;
669 in6_dev = in6_dev_get(dev);
670 if (!in6_dev)
671 goto errout;
672 devconf = &in6_dev->cnf;
673 break;
674 }
675
676 err = -ENOBUFS;
677 skb = nlmsg_new(inet6_netconf_msgsize_devconf(NETCONFA_ALL), GFP_KERNEL);
678 if (!skb)
679 goto errout;
680
681 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
682 NETLINK_CB(in_skb).portid,
683 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
684 NETCONFA_ALL);
685 if (err < 0) {
686
687 WARN_ON(err == -EMSGSIZE);
688 kfree_skb(skb);
689 goto errout;
690 }
691 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
692errout:
693 if (in6_dev)
694 in6_dev_put(in6_dev);
695 if (dev)
696 dev_put(dev);
697 return err;
698}
699
700static int inet6_netconf_dump_devconf(struct sk_buff *skb,
701 struct netlink_callback *cb)
702{
703 const struct nlmsghdr *nlh = cb->nlh;
704 struct net *net = sock_net(skb->sk);
705 int h, s_h;
706 int idx, s_idx;
707 struct net_device *dev;
708 struct inet6_dev *idev;
709 struct hlist_head *head;
710
711 if (cb->strict_check) {
712 struct netlink_ext_ack *extack = cb->extack;
713 struct netconfmsg *ncm;
714
715 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ncm))) {
716 NL_SET_ERR_MSG_MOD(extack, "Invalid header for netconf dump request");
717 return -EINVAL;
718 }
719
720 if (nlmsg_attrlen(nlh, sizeof(*ncm))) {
721 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in netconf dump request");
722 return -EINVAL;
723 }
724 }
725
726 s_h = cb->args[0];
727 s_idx = idx = cb->args[1];
728
729 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
730 idx = 0;
731 head = &net->dev_index_head[h];
732 rcu_read_lock();
733 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
734 net->dev_base_seq;
735 hlist_for_each_entry_rcu(dev, head, index_hlist) {
736 if (idx < s_idx)
737 goto cont;
738 idev = __in6_dev_get(dev);
739 if (!idev)
740 goto cont;
741
742 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
743 &idev->cnf,
744 NETLINK_CB(cb->skb).portid,
745 nlh->nlmsg_seq,
746 RTM_NEWNETCONF,
747 NLM_F_MULTI,
748 NETCONFA_ALL) < 0) {
749 rcu_read_unlock();
750 goto done;
751 }
752 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
753cont:
754 idx++;
755 }
756 rcu_read_unlock();
757 }
758 if (h == NETDEV_HASHENTRIES) {
759 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
760 net->ipv6.devconf_all,
761 NETLINK_CB(cb->skb).portid,
762 nlh->nlmsg_seq,
763 RTM_NEWNETCONF, NLM_F_MULTI,
764 NETCONFA_ALL) < 0)
765 goto done;
766 else
767 h++;
768 }
769 if (h == NETDEV_HASHENTRIES + 1) {
770 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
771 net->ipv6.devconf_dflt,
772 NETLINK_CB(cb->skb).portid,
773 nlh->nlmsg_seq,
774 RTM_NEWNETCONF, NLM_F_MULTI,
775 NETCONFA_ALL) < 0)
776 goto done;
777 else
778 h++;
779 }
780done:
781 cb->args[0] = h;
782 cb->args[1] = idx;
783
784 return skb->len;
785}
786
787#ifdef CONFIG_SYSCTL
788static void dev_forward_change(struct inet6_dev *idev)
789{
790 struct net_device *dev;
791 struct inet6_ifaddr *ifa;
792
793 if (!idev)
794 return;
795 dev = idev->dev;
796 if (idev->cnf.forwarding)
797 dev_disable_lro(dev);
798 if (dev->flags & IFF_MULTICAST) {
799 if (idev->cnf.forwarding) {
800 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
801 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
802 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
803 } else {
804 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
805 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
806 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
807 }
808 }
809
810 list_for_each_entry(ifa, &idev->addr_list, if_list) {
811 if (ifa->flags&IFA_F_TENTATIVE)
812 continue;
813 if (idev->cnf.forwarding)
814 addrconf_join_anycast(ifa);
815 else
816 addrconf_leave_anycast(ifa);
817 }
818 inet6_netconf_notify_devconf(dev_net(dev), RTM_NEWNETCONF,
819 NETCONFA_FORWARDING,
820 dev->ifindex, &idev->cnf);
821}
822
823
824static void addrconf_forward_change(struct net *net, __s32 newf)
825{
826 struct net_device *dev;
827 struct inet6_dev *idev;
828
829 for_each_netdev(net, dev) {
830 idev = __in6_dev_get(dev);
831 if (idev) {
832 int changed = (!idev->cnf.forwarding) ^ (!newf);
833 idev->cnf.forwarding = newf;
834 if (changed)
835 dev_forward_change(idev);
836 }
837 }
838}
839
840static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
841{
842 struct net *net;
843 int old;
844
845 if (!rtnl_trylock())
846 return restart_syscall();
847
848 net = (struct net *)table->extra2;
849 old = *p;
850 *p = newf;
851
852 if (p == &net->ipv6.devconf_dflt->forwarding) {
853 if ((!newf) ^ (!old))
854 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
855 NETCONFA_FORWARDING,
856 NETCONFA_IFINDEX_DEFAULT,
857 net->ipv6.devconf_dflt);
858 rtnl_unlock();
859 return 0;
860 }
861
862 if (p == &net->ipv6.devconf_all->forwarding) {
863 int old_dflt = net->ipv6.devconf_dflt->forwarding;
864
865 net->ipv6.devconf_dflt->forwarding = newf;
866 if ((!newf) ^ (!old_dflt))
867 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
868 NETCONFA_FORWARDING,
869 NETCONFA_IFINDEX_DEFAULT,
870 net->ipv6.devconf_dflt);
871
872 addrconf_forward_change(net, newf);
873 if ((!newf) ^ (!old))
874 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
875 NETCONFA_FORWARDING,
876 NETCONFA_IFINDEX_ALL,
877 net->ipv6.devconf_all);
878 } else if ((!newf) ^ (!old))
879 dev_forward_change((struct inet6_dev *)table->extra1);
880 rtnl_unlock();
881
882 if (newf)
883 rt6_purge_dflt_routers(net);
884 return 1;
885}
886
887static void addrconf_linkdown_change(struct net *net, __s32 newf)
888{
889 struct net_device *dev;
890 struct inet6_dev *idev;
891
892 for_each_netdev(net, dev) {
893 idev = __in6_dev_get(dev);
894 if (idev) {
895 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
896
897 idev->cnf.ignore_routes_with_linkdown = newf;
898 if (changed)
899 inet6_netconf_notify_devconf(dev_net(dev),
900 RTM_NEWNETCONF,
901 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
902 dev->ifindex,
903 &idev->cnf);
904 }
905 }
906}
907
908static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
909{
910 struct net *net;
911 int old;
912
913 if (!rtnl_trylock())
914 return restart_syscall();
915
916 net = (struct net *)table->extra2;
917 old = *p;
918 *p = newf;
919
920 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
921 if ((!newf) ^ (!old))
922 inet6_netconf_notify_devconf(net,
923 RTM_NEWNETCONF,
924 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
925 NETCONFA_IFINDEX_DEFAULT,
926 net->ipv6.devconf_dflt);
927 rtnl_unlock();
928 return 0;
929 }
930
931 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
932 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
933 addrconf_linkdown_change(net, newf);
934 if ((!newf) ^ (!old))
935 inet6_netconf_notify_devconf(net,
936 RTM_NEWNETCONF,
937 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
938 NETCONFA_IFINDEX_ALL,
939 net->ipv6.devconf_all);
940 }
941 rtnl_unlock();
942
943 return 1;
944}
945
946#endif
947
948
949void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
950{
951 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
952
953#ifdef NET_REFCNT_DEBUG
954 pr_debug("%s\n", __func__);
955#endif
956
957 in6_dev_put(ifp->idev);
958
959 if (cancel_delayed_work(&ifp->dad_work))
960 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
961 ifp);
962
963 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
964 pr_warn("Freeing alive inet6 address %p\n", ifp);
965 return;
966 }
967
968 kfree_rcu(ifp, rcu);
969}
970
971static void
972ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
973{
974 struct list_head *p;
975 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
976
977
978
979
980
981 list_for_each(p, &idev->addr_list) {
982 struct inet6_ifaddr *ifa
983 = list_entry(p, struct inet6_ifaddr, if_list);
984 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
985 break;
986 }
987
988 list_add_tail_rcu(&ifp->if_list, p);
989}
990
991static u32 inet6_addr_hash(const struct net *net, const struct in6_addr *addr)
992{
993 u32 val = ipv6_addr_hash(addr) ^ net_hash_mix(net);
994
995 return hash_32(val, IN6_ADDR_HSIZE_SHIFT);
996}
997
998static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
999 struct net_device *dev, unsigned int hash)
1000{
1001 struct inet6_ifaddr *ifp;
1002
1003 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1004 if (!net_eq(dev_net(ifp->idev->dev), net))
1005 continue;
1006 if (ipv6_addr_equal(&ifp->addr, addr)) {
1007 if (!dev || ifp->idev->dev == dev)
1008 return true;
1009 }
1010 }
1011 return false;
1012}
1013
1014static int ipv6_add_addr_hash(struct net_device *dev, struct inet6_ifaddr *ifa)
1015{
1016 unsigned int hash = inet6_addr_hash(dev_net(dev), &ifa->addr);
1017 int err = 0;
1018
1019 spin_lock(&addrconf_hash_lock);
1020
1021
1022 if (ipv6_chk_same_addr(dev_net(dev), &ifa->addr, dev, hash)) {
1023 netdev_dbg(dev, "ipv6_add_addr: already assigned\n");
1024 err = -EEXIST;
1025 } else {
1026 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
1027 }
1028
1029 spin_unlock(&addrconf_hash_lock);
1030
1031 return err;
1032}
1033
1034
1035
1036static struct inet6_ifaddr *
1037ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
1038 bool can_block, struct netlink_ext_ack *extack)
1039{
1040 gfp_t gfp_flags = can_block ? GFP_KERNEL : GFP_ATOMIC;
1041 int addr_type = ipv6_addr_type(cfg->pfx);
1042 struct net *net = dev_net(idev->dev);
1043 struct inet6_ifaddr *ifa = NULL;
1044 struct fib6_info *f6i = NULL;
1045 int err = 0;
1046
1047 if (addr_type == IPV6_ADDR_ANY ||
1048 (addr_type & IPV6_ADDR_MULTICAST &&
1049 !(cfg->ifa_flags & IFA_F_MCAUTOJOIN)) ||
1050 (!(idev->dev->flags & IFF_LOOPBACK) &&
1051 !netif_is_l3_master(idev->dev) &&
1052 addr_type & IPV6_ADDR_LOOPBACK))
1053 return ERR_PTR(-EADDRNOTAVAIL);
1054
1055 if (idev->dead) {
1056 err = -ENODEV;
1057 goto out;
1058 }
1059
1060 if (idev->cnf.disable_ipv6) {
1061 err = -EACCES;
1062 goto out;
1063 }
1064
1065
1066
1067
1068 if (can_block) {
1069 struct in6_validator_info i6vi = {
1070 .i6vi_addr = *cfg->pfx,
1071 .i6vi_dev = idev,
1072 .extack = extack,
1073 };
1074
1075 err = inet6addr_validator_notifier_call_chain(NETDEV_UP, &i6vi);
1076 err = notifier_to_errno(err);
1077 if (err < 0)
1078 goto out;
1079 }
1080
1081 ifa = kzalloc(sizeof(*ifa), gfp_flags);
1082 if (!ifa) {
1083 err = -ENOBUFS;
1084 goto out;
1085 }
1086
1087 f6i = addrconf_f6i_alloc(net, idev, cfg->pfx, false, gfp_flags);
1088 if (IS_ERR(f6i)) {
1089 err = PTR_ERR(f6i);
1090 f6i = NULL;
1091 goto out;
1092 }
1093
1094 if (net->ipv6.devconf_all->disable_policy ||
1095 idev->cnf.disable_policy)
1096 f6i->dst_nopolicy = true;
1097
1098 neigh_parms_data_state_setall(idev->nd_parms);
1099
1100 ifa->addr = *cfg->pfx;
1101 if (cfg->peer_pfx)
1102 ifa->peer_addr = *cfg->peer_pfx;
1103
1104 spin_lock_init(&ifa->lock);
1105 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
1106 INIT_HLIST_NODE(&ifa->addr_lst);
1107 ifa->scope = cfg->scope;
1108 ifa->prefix_len = cfg->plen;
1109 ifa->rt_priority = cfg->rt_priority;
1110 ifa->flags = cfg->ifa_flags;
1111
1112 if (!(cfg->ifa_flags & IFA_F_NODAD))
1113 ifa->flags |= IFA_F_TENTATIVE;
1114 ifa->valid_lft = cfg->valid_lft;
1115 ifa->prefered_lft = cfg->preferred_lft;
1116 ifa->cstamp = ifa->tstamp = jiffies;
1117 ifa->tokenized = false;
1118
1119 ifa->rt = f6i;
1120
1121 ifa->idev = idev;
1122 in6_dev_hold(idev);
1123
1124
1125 refcount_set(&ifa->refcnt, 1);
1126
1127 rcu_read_lock_bh();
1128
1129 err = ipv6_add_addr_hash(idev->dev, ifa);
1130 if (err < 0) {
1131 rcu_read_unlock_bh();
1132 goto out;
1133 }
1134
1135 write_lock(&idev->lock);
1136
1137
1138 ipv6_link_dev_addr(idev, ifa);
1139
1140 if (ifa->flags&IFA_F_TEMPORARY) {
1141 list_add(&ifa->tmp_list, &idev->tempaddr_list);
1142 in6_ifa_hold(ifa);
1143 }
1144
1145 in6_ifa_hold(ifa);
1146 write_unlock(&idev->lock);
1147
1148 rcu_read_unlock_bh();
1149
1150 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1151out:
1152 if (unlikely(err < 0)) {
1153 fib6_info_release(f6i);
1154
1155 if (ifa) {
1156 if (ifa->idev)
1157 in6_dev_put(ifa->idev);
1158 kfree(ifa);
1159 }
1160 ifa = ERR_PTR(err);
1161 }
1162
1163 return ifa;
1164}
1165
1166enum cleanup_prefix_rt_t {
1167 CLEANUP_PREFIX_RT_NOP,
1168 CLEANUP_PREFIX_RT_DEL,
1169 CLEANUP_PREFIX_RT_EXPIRE,
1170};
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190static enum cleanup_prefix_rt_t
1191check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1192{
1193 struct inet6_ifaddr *ifa;
1194 struct inet6_dev *idev = ifp->idev;
1195 unsigned long lifetime;
1196 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1197
1198 *expires = jiffies;
1199
1200 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1201 if (ifa == ifp)
1202 continue;
1203 if (ifa->prefix_len != ifp->prefix_len ||
1204 !ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1205 ifp->prefix_len))
1206 continue;
1207 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1208 return CLEANUP_PREFIX_RT_NOP;
1209
1210 action = CLEANUP_PREFIX_RT_EXPIRE;
1211
1212 spin_lock(&ifa->lock);
1213
1214 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1215
1216
1217
1218
1219
1220 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1221 *expires = ifa->tstamp + lifetime * HZ;
1222 spin_unlock(&ifa->lock);
1223 }
1224
1225 return action;
1226}
1227
1228static void
1229cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires,
1230 bool del_rt, bool del_peer)
1231{
1232 struct fib6_info *f6i;
1233
1234 f6i = addrconf_get_prefix_route(del_peer ? &ifp->peer_addr : &ifp->addr,
1235 ifp->prefix_len,
1236 ifp->idev->dev, 0, RTF_DEFAULT, true);
1237 if (f6i) {
1238 if (del_rt)
1239 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
1240 else {
1241 if (!(f6i->fib6_flags & RTF_EXPIRES))
1242 fib6_set_expires(f6i, expires);
1243 fib6_info_release(f6i);
1244 }
1245 }
1246}
1247
1248
1249
1250
1251static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1252{
1253 int state;
1254 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1255 unsigned long expires;
1256
1257 ASSERT_RTNL();
1258
1259 spin_lock_bh(&ifp->lock);
1260 state = ifp->state;
1261 ifp->state = INET6_IFADDR_STATE_DEAD;
1262 spin_unlock_bh(&ifp->lock);
1263
1264 if (state == INET6_IFADDR_STATE_DEAD)
1265 goto out;
1266
1267 spin_lock_bh(&addrconf_hash_lock);
1268 hlist_del_init_rcu(&ifp->addr_lst);
1269 spin_unlock_bh(&addrconf_hash_lock);
1270
1271 write_lock_bh(&ifp->idev->lock);
1272
1273 if (ifp->flags&IFA_F_TEMPORARY) {
1274 list_del(&ifp->tmp_list);
1275 if (ifp->ifpub) {
1276 in6_ifa_put(ifp->ifpub);
1277 ifp->ifpub = NULL;
1278 }
1279 __in6_ifa_put(ifp);
1280 }
1281
1282 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1283 action = check_cleanup_prefix_route(ifp, &expires);
1284
1285 list_del_rcu(&ifp->if_list);
1286 __in6_ifa_put(ifp);
1287
1288 write_unlock_bh(&ifp->idev->lock);
1289
1290 addrconf_del_dad_work(ifp);
1291
1292 ipv6_ifa_notify(RTM_DELADDR, ifp);
1293
1294 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1295
1296 if (action != CLEANUP_PREFIX_RT_NOP) {
1297 cleanup_prefix_route(ifp, expires,
1298 action == CLEANUP_PREFIX_RT_DEL, false);
1299 }
1300
1301
1302 rt6_remove_prefsrc(ifp);
1303out:
1304 in6_ifa_put(ifp);
1305}
1306
1307static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, bool block)
1308{
1309 struct inet6_dev *idev = ifp->idev;
1310 unsigned long tmp_tstamp, age;
1311 unsigned long regen_advance;
1312 unsigned long now = jiffies;
1313 s32 cnf_temp_preferred_lft;
1314 struct inet6_ifaddr *ift;
1315 struct ifa6_config cfg;
1316 long max_desync_factor;
1317 struct in6_addr addr;
1318 int ret = 0;
1319
1320 write_lock_bh(&idev->lock);
1321
1322retry:
1323 in6_dev_hold(idev);
1324 if (idev->cnf.use_tempaddr <= 0) {
1325 write_unlock_bh(&idev->lock);
1326 pr_info("%s: use_tempaddr is disabled\n", __func__);
1327 in6_dev_put(idev);
1328 ret = -1;
1329 goto out;
1330 }
1331 spin_lock_bh(&ifp->lock);
1332 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1333 idev->cnf.use_tempaddr = -1;
1334 spin_unlock_bh(&ifp->lock);
1335 write_unlock_bh(&idev->lock);
1336 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1337 __func__);
1338 in6_dev_put(idev);
1339 ret = -1;
1340 goto out;
1341 }
1342 in6_ifa_hold(ifp);
1343 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1344 ipv6_gen_rnd_iid(&addr);
1345
1346 age = (now - ifp->tstamp) / HZ;
1347
1348 regen_advance = idev->cnf.regen_max_retry *
1349 idev->cnf.dad_transmits *
1350 max(NEIGH_VAR(idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
1351
1352
1353
1354
1355 cnf_temp_preferred_lft = READ_ONCE(idev->cnf.temp_prefered_lft);
1356 max_desync_factor = min_t(__u32,
1357 idev->cnf.max_desync_factor,
1358 cnf_temp_preferred_lft - regen_advance);
1359
1360 if (unlikely(idev->desync_factor > max_desync_factor)) {
1361 if (max_desync_factor > 0) {
1362 get_random_bytes(&idev->desync_factor,
1363 sizeof(idev->desync_factor));
1364 idev->desync_factor %= max_desync_factor;
1365 } else {
1366 idev->desync_factor = 0;
1367 }
1368 }
1369
1370 memset(&cfg, 0, sizeof(cfg));
1371 cfg.valid_lft = min_t(__u32, ifp->valid_lft,
1372 idev->cnf.temp_valid_lft + age);
1373 cfg.preferred_lft = cnf_temp_preferred_lft + age - idev->desync_factor;
1374 cfg.preferred_lft = min_t(__u32, ifp->prefered_lft, cfg.preferred_lft);
1375
1376 cfg.plen = ifp->prefix_len;
1377 tmp_tstamp = ifp->tstamp;
1378 spin_unlock_bh(&ifp->lock);
1379
1380 write_unlock_bh(&idev->lock);
1381
1382
1383
1384
1385
1386
1387
1388
1389 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1390 if (cfg.preferred_lft <= regen_advance + age) {
1391 in6_ifa_put(ifp);
1392 in6_dev_put(idev);
1393 ret = -1;
1394 goto out;
1395 }
1396
1397 cfg.ifa_flags = IFA_F_TEMPORARY;
1398
1399 if (ifp->flags & IFA_F_OPTIMISTIC)
1400 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
1401
1402 cfg.pfx = &addr;
1403 cfg.scope = ipv6_addr_scope(cfg.pfx);
1404
1405 ift = ipv6_add_addr(idev, &cfg, block, NULL);
1406 if (IS_ERR(ift)) {
1407 in6_ifa_put(ifp);
1408 in6_dev_put(idev);
1409 pr_info("%s: retry temporary address regeneration\n", __func__);
1410 write_lock_bh(&idev->lock);
1411 goto retry;
1412 }
1413
1414 spin_lock_bh(&ift->lock);
1415 ift->ifpub = ifp;
1416 ift->cstamp = now;
1417 ift->tstamp = tmp_tstamp;
1418 spin_unlock_bh(&ift->lock);
1419
1420 addrconf_dad_start(ift);
1421 in6_ifa_put(ift);
1422 in6_dev_put(idev);
1423out:
1424 return ret;
1425}
1426
1427
1428
1429
1430enum {
1431 IPV6_SADDR_RULE_INIT = 0,
1432 IPV6_SADDR_RULE_LOCAL,
1433 IPV6_SADDR_RULE_SCOPE,
1434 IPV6_SADDR_RULE_PREFERRED,
1435#ifdef CONFIG_IPV6_MIP6
1436 IPV6_SADDR_RULE_HOA,
1437#endif
1438 IPV6_SADDR_RULE_OIF,
1439 IPV6_SADDR_RULE_LABEL,
1440 IPV6_SADDR_RULE_PRIVACY,
1441 IPV6_SADDR_RULE_ORCHID,
1442 IPV6_SADDR_RULE_PREFIX,
1443#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1444 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1445#endif
1446 IPV6_SADDR_RULE_MAX
1447};
1448
1449struct ipv6_saddr_score {
1450 int rule;
1451 int addr_type;
1452 struct inet6_ifaddr *ifa;
1453 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1454 int scopedist;
1455 int matchlen;
1456};
1457
1458struct ipv6_saddr_dst {
1459 const struct in6_addr *addr;
1460 int ifindex;
1461 int scope;
1462 int label;
1463 unsigned int prefs;
1464};
1465
1466static inline int ipv6_saddr_preferred(int type)
1467{
1468 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1469 return 1;
1470 return 0;
1471}
1472
1473static bool ipv6_use_optimistic_addr(struct net *net,
1474 struct inet6_dev *idev)
1475{
1476#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1477 if (!idev)
1478 return false;
1479 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1480 return false;
1481 if (!net->ipv6.devconf_all->use_optimistic && !idev->cnf.use_optimistic)
1482 return false;
1483
1484 return true;
1485#else
1486 return false;
1487#endif
1488}
1489
1490static bool ipv6_allow_optimistic_dad(struct net *net,
1491 struct inet6_dev *idev)
1492{
1493#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1494 if (!idev)
1495 return false;
1496 if (!net->ipv6.devconf_all->optimistic_dad && !idev->cnf.optimistic_dad)
1497 return false;
1498
1499 return true;
1500#else
1501 return false;
1502#endif
1503}
1504
1505static int ipv6_get_saddr_eval(struct net *net,
1506 struct ipv6_saddr_score *score,
1507 struct ipv6_saddr_dst *dst,
1508 int i)
1509{
1510 int ret;
1511
1512 if (i <= score->rule) {
1513 switch (i) {
1514 case IPV6_SADDR_RULE_SCOPE:
1515 ret = score->scopedist;
1516 break;
1517 case IPV6_SADDR_RULE_PREFIX:
1518 ret = score->matchlen;
1519 break;
1520 default:
1521 ret = !!test_bit(i, score->scorebits);
1522 }
1523 goto out;
1524 }
1525
1526 switch (i) {
1527 case IPV6_SADDR_RULE_INIT:
1528
1529 ret = !!score->ifa;
1530 break;
1531 case IPV6_SADDR_RULE_LOCAL:
1532
1533 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1534 break;
1535 case IPV6_SADDR_RULE_SCOPE:
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557 ret = __ipv6_addr_src_scope(score->addr_type);
1558 if (ret >= dst->scope)
1559 ret = -ret;
1560 else
1561 ret -= 128;
1562 score->scopedist = ret;
1563 break;
1564 case IPV6_SADDR_RULE_PREFERRED:
1565 {
1566
1567 u8 avoid = IFA_F_DEPRECATED;
1568
1569 if (!ipv6_use_optimistic_addr(net, score->ifa->idev))
1570 avoid |= IFA_F_OPTIMISTIC;
1571 ret = ipv6_saddr_preferred(score->addr_type) ||
1572 !(score->ifa->flags & avoid);
1573 break;
1574 }
1575#ifdef CONFIG_IPV6_MIP6
1576 case IPV6_SADDR_RULE_HOA:
1577 {
1578
1579 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1580 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1581 break;
1582 }
1583#endif
1584 case IPV6_SADDR_RULE_OIF:
1585
1586 ret = (!dst->ifindex ||
1587 dst->ifindex == score->ifa->idev->dev->ifindex);
1588 break;
1589 case IPV6_SADDR_RULE_LABEL:
1590
1591 ret = ipv6_addr_label(net,
1592 &score->ifa->addr, score->addr_type,
1593 score->ifa->idev->dev->ifindex) == dst->label;
1594 break;
1595 case IPV6_SADDR_RULE_PRIVACY:
1596 {
1597
1598
1599
1600 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1601 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1602 score->ifa->idev->cnf.use_tempaddr >= 2;
1603 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1604 break;
1605 }
1606 case IPV6_SADDR_RULE_ORCHID:
1607
1608
1609
1610 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1611 ipv6_addr_orchid(dst->addr));
1612 break;
1613 case IPV6_SADDR_RULE_PREFIX:
1614
1615 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1616 if (ret > score->ifa->prefix_len)
1617 ret = score->ifa->prefix_len;
1618 score->matchlen = ret;
1619 break;
1620#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1621 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1622
1623
1624
1625 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1626 break;
1627#endif
1628 default:
1629 ret = 0;
1630 }
1631
1632 if (ret)
1633 __set_bit(i, score->scorebits);
1634 score->rule = i;
1635out:
1636 return ret;
1637}
1638
1639static int __ipv6_dev_get_saddr(struct net *net,
1640 struct ipv6_saddr_dst *dst,
1641 struct inet6_dev *idev,
1642 struct ipv6_saddr_score *scores,
1643 int hiscore_idx)
1644{
1645 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1646
1647 list_for_each_entry_rcu(score->ifa, &idev->addr_list, if_list) {
1648 int i;
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1661 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1662 continue;
1663
1664 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1665
1666 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1667 score->addr_type & IPV6_ADDR_MULTICAST)) {
1668 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1669 idev->dev->name);
1670 continue;
1671 }
1672
1673 score->rule = -1;
1674 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1675
1676 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1677 int minihiscore, miniscore;
1678
1679 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1680 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1681
1682 if (minihiscore > miniscore) {
1683 if (i == IPV6_SADDR_RULE_SCOPE &&
1684 score->scopedist > 0) {
1685
1686
1687
1688
1689
1690
1691
1692
1693 goto out;
1694 }
1695 break;
1696 } else if (minihiscore < miniscore) {
1697 swap(hiscore, score);
1698 hiscore_idx = 1 - hiscore_idx;
1699
1700
1701 score->ifa = hiscore->ifa;
1702
1703 break;
1704 }
1705 }
1706 }
1707out:
1708 return hiscore_idx;
1709}
1710
1711static int ipv6_get_saddr_master(struct net *net,
1712 const struct net_device *dst_dev,
1713 const struct net_device *master,
1714 struct ipv6_saddr_dst *dst,
1715 struct ipv6_saddr_score *scores,
1716 int hiscore_idx)
1717{
1718 struct inet6_dev *idev;
1719
1720 idev = __in6_dev_get(dst_dev);
1721 if (idev)
1722 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1723 scores, hiscore_idx);
1724
1725 idev = __in6_dev_get(master);
1726 if (idev)
1727 hiscore_idx = __ipv6_dev_get_saddr(net, dst, idev,
1728 scores, hiscore_idx);
1729
1730 return hiscore_idx;
1731}
1732
1733int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1734 const struct in6_addr *daddr, unsigned int prefs,
1735 struct in6_addr *saddr)
1736{
1737 struct ipv6_saddr_score scores[2], *hiscore;
1738 struct ipv6_saddr_dst dst;
1739 struct inet6_dev *idev;
1740 struct net_device *dev;
1741 int dst_type;
1742 bool use_oif_addr = false;
1743 int hiscore_idx = 0;
1744 int ret = 0;
1745
1746 dst_type = __ipv6_addr_type(daddr);
1747 dst.addr = daddr;
1748 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1749 dst.scope = __ipv6_addr_src_scope(dst_type);
1750 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1751 dst.prefs = prefs;
1752
1753 scores[hiscore_idx].rule = -1;
1754 scores[hiscore_idx].ifa = NULL;
1755
1756 rcu_read_lock();
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774 if (dst_dev) {
1775 idev = __in6_dev_get(dst_dev);
1776 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1777 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1778 (idev && idev->cnf.use_oif_addrs_only)) {
1779 use_oif_addr = true;
1780 }
1781 }
1782
1783 if (use_oif_addr) {
1784 if (idev)
1785 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1786 } else {
1787 const struct net_device *master;
1788 int master_idx = 0;
1789
1790
1791
1792
1793
1794 master = l3mdev_master_dev_rcu(dst_dev);
1795 if (master) {
1796 master_idx = master->ifindex;
1797
1798 hiscore_idx = ipv6_get_saddr_master(net, dst_dev,
1799 master, &dst,
1800 scores, hiscore_idx);
1801
1802 if (scores[hiscore_idx].ifa)
1803 goto out;
1804 }
1805
1806 for_each_netdev_rcu(net, dev) {
1807
1808
1809
1810 if (l3mdev_master_ifindex_rcu(dev) != master_idx)
1811 continue;
1812 idev = __in6_dev_get(dev);
1813 if (!idev)
1814 continue;
1815 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1816 }
1817 }
1818
1819out:
1820 hiscore = &scores[hiscore_idx];
1821 if (!hiscore->ifa)
1822 ret = -EADDRNOTAVAIL;
1823 else
1824 *saddr = hiscore->ifa->addr;
1825
1826 rcu_read_unlock();
1827 return ret;
1828}
1829EXPORT_SYMBOL(ipv6_dev_get_saddr);
1830
1831int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1832 u32 banned_flags)
1833{
1834 struct inet6_ifaddr *ifp;
1835 int err = -EADDRNOTAVAIL;
1836
1837 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1838 if (ifp->scope > IFA_LINK)
1839 break;
1840 if (ifp->scope == IFA_LINK &&
1841 !(ifp->flags & banned_flags)) {
1842 *addr = ifp->addr;
1843 err = 0;
1844 break;
1845 }
1846 }
1847 return err;
1848}
1849
1850int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1851 u32 banned_flags)
1852{
1853 struct inet6_dev *idev;
1854 int err = -EADDRNOTAVAIL;
1855
1856 rcu_read_lock();
1857 idev = __in6_dev_get(dev);
1858 if (idev) {
1859 read_lock_bh(&idev->lock);
1860 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1861 read_unlock_bh(&idev->lock);
1862 }
1863 rcu_read_unlock();
1864 return err;
1865}
1866
1867static int ipv6_count_addresses(const struct inet6_dev *idev)
1868{
1869 const struct inet6_ifaddr *ifp;
1870 int cnt = 0;
1871
1872 rcu_read_lock();
1873 list_for_each_entry_rcu(ifp, &idev->addr_list, if_list)
1874 cnt++;
1875 rcu_read_unlock();
1876 return cnt;
1877}
1878
1879int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1880 const struct net_device *dev, int strict)
1881{
1882 return ipv6_chk_addr_and_flags(net, addr, dev, !dev,
1883 strict, IFA_F_TENTATIVE);
1884}
1885EXPORT_SYMBOL(ipv6_chk_addr);
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1897 const struct net_device *dev, bool skip_dev_check,
1898 int strict, u32 banned_flags)
1899{
1900 unsigned int hash = inet6_addr_hash(net, addr);
1901 const struct net_device *l3mdev;
1902 struct inet6_ifaddr *ifp;
1903 u32 ifp_flags;
1904
1905 rcu_read_lock();
1906
1907 l3mdev = l3mdev_master_dev_rcu(dev);
1908 if (skip_dev_check)
1909 dev = NULL;
1910
1911 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1912 if (!net_eq(dev_net(ifp->idev->dev), net))
1913 continue;
1914
1915 if (l3mdev_master_dev_rcu(ifp->idev->dev) != l3mdev)
1916 continue;
1917
1918
1919
1920
1921 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1922 ? (ifp->flags&~IFA_F_TENTATIVE)
1923 : ifp->flags;
1924 if (ipv6_addr_equal(&ifp->addr, addr) &&
1925 !(ifp_flags&banned_flags) &&
1926 (!dev || ifp->idev->dev == dev ||
1927 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1928 rcu_read_unlock();
1929 return 1;
1930 }
1931 }
1932
1933 rcu_read_unlock();
1934 return 0;
1935}
1936EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1937
1938
1939
1940
1941
1942bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1943 const unsigned int prefix_len, struct net_device *dev)
1944{
1945 const struct inet6_ifaddr *ifa;
1946 const struct inet6_dev *idev;
1947 bool ret = false;
1948
1949 rcu_read_lock();
1950 idev = __in6_dev_get(dev);
1951 if (idev) {
1952 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1953 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1954 if (ret)
1955 break;
1956 }
1957 }
1958 rcu_read_unlock();
1959
1960 return ret;
1961}
1962EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1963
1964int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1965{
1966 const struct inet6_ifaddr *ifa;
1967 const struct inet6_dev *idev;
1968 int onlink;
1969
1970 onlink = 0;
1971 rcu_read_lock();
1972 idev = __in6_dev_get(dev);
1973 if (idev) {
1974 list_for_each_entry_rcu(ifa, &idev->addr_list, if_list) {
1975 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1976 ifa->prefix_len);
1977 if (onlink)
1978 break;
1979 }
1980 }
1981 rcu_read_unlock();
1982 return onlink;
1983}
1984EXPORT_SYMBOL(ipv6_chk_prefix);
1985
1986struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1987 struct net_device *dev, int strict)
1988{
1989 unsigned int hash = inet6_addr_hash(net, addr);
1990 struct inet6_ifaddr *ifp, *result = NULL;
1991
1992 rcu_read_lock();
1993 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1994 if (!net_eq(dev_net(ifp->idev->dev), net))
1995 continue;
1996 if (ipv6_addr_equal(&ifp->addr, addr)) {
1997 if (!dev || ifp->idev->dev == dev ||
1998 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1999 result = ifp;
2000 in6_ifa_hold(ifp);
2001 break;
2002 }
2003 }
2004 }
2005 rcu_read_unlock();
2006
2007 return result;
2008}
2009
2010
2011
2012static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
2013{
2014 if (dad_failed)
2015 ifp->flags |= IFA_F_DADFAILED;
2016
2017 if (ifp->flags&IFA_F_TEMPORARY) {
2018 struct inet6_ifaddr *ifpub;
2019 spin_lock_bh(&ifp->lock);
2020 ifpub = ifp->ifpub;
2021 if (ifpub) {
2022 in6_ifa_hold(ifpub);
2023 spin_unlock_bh(&ifp->lock);
2024 ipv6_create_tempaddr(ifpub, true);
2025 in6_ifa_put(ifpub);
2026 } else {
2027 spin_unlock_bh(&ifp->lock);
2028 }
2029 ipv6_del_addr(ifp);
2030 } else if (ifp->flags&IFA_F_PERMANENT || !dad_failed) {
2031 spin_lock_bh(&ifp->lock);
2032 addrconf_del_dad_work(ifp);
2033 ifp->flags |= IFA_F_TENTATIVE;
2034 if (dad_failed)
2035 ifp->flags &= ~IFA_F_OPTIMISTIC;
2036 spin_unlock_bh(&ifp->lock);
2037 if (dad_failed)
2038 ipv6_ifa_notify(0, ifp);
2039 in6_ifa_put(ifp);
2040 } else {
2041 ipv6_del_addr(ifp);
2042 }
2043}
2044
2045static int addrconf_dad_end(struct inet6_ifaddr *ifp)
2046{
2047 int err = -ENOENT;
2048
2049 spin_lock_bh(&ifp->lock);
2050 if (ifp->state == INET6_IFADDR_STATE_DAD) {
2051 ifp->state = INET6_IFADDR_STATE_POSTDAD;
2052 err = 0;
2053 }
2054 spin_unlock_bh(&ifp->lock);
2055
2056 return err;
2057}
2058
2059void addrconf_dad_failure(struct sk_buff *skb, struct inet6_ifaddr *ifp)
2060{
2061 struct inet6_dev *idev = ifp->idev;
2062 struct net *net = dev_net(ifp->idev->dev);
2063
2064 if (addrconf_dad_end(ifp)) {
2065 in6_ifa_put(ifp);
2066 return;
2067 }
2068
2069 net_info_ratelimited("%s: IPv6 duplicate address %pI6c used by %pM detected!\n",
2070 ifp->idev->dev->name, &ifp->addr, eth_hdr(skb)->h_source);
2071
2072 spin_lock_bh(&ifp->lock);
2073
2074 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
2075 struct in6_addr new_addr;
2076 struct inet6_ifaddr *ifp2;
2077 int retries = ifp->stable_privacy_retry + 1;
2078 struct ifa6_config cfg = {
2079 .pfx = &new_addr,
2080 .plen = ifp->prefix_len,
2081 .ifa_flags = ifp->flags,
2082 .valid_lft = ifp->valid_lft,
2083 .preferred_lft = ifp->prefered_lft,
2084 .scope = ifp->scope,
2085 };
2086
2087 if (retries > net->ipv6.sysctl.idgen_retries) {
2088 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
2089 ifp->idev->dev->name);
2090 goto errdad;
2091 }
2092
2093 new_addr = ifp->addr;
2094 if (ipv6_generate_stable_address(&new_addr, retries,
2095 idev))
2096 goto errdad;
2097
2098 spin_unlock_bh(&ifp->lock);
2099
2100 if (idev->cnf.max_addresses &&
2101 ipv6_count_addresses(idev) >=
2102 idev->cnf.max_addresses)
2103 goto lock_errdad;
2104
2105 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
2106 ifp->idev->dev->name);
2107
2108 ifp2 = ipv6_add_addr(idev, &cfg, false, NULL);
2109 if (IS_ERR(ifp2))
2110 goto lock_errdad;
2111
2112 spin_lock_bh(&ifp2->lock);
2113 ifp2->stable_privacy_retry = retries;
2114 ifp2->state = INET6_IFADDR_STATE_PREDAD;
2115 spin_unlock_bh(&ifp2->lock);
2116
2117 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
2118 in6_ifa_put(ifp2);
2119lock_errdad:
2120 spin_lock_bh(&ifp->lock);
2121 }
2122
2123errdad:
2124
2125 ifp->state = INET6_IFADDR_STATE_ERRDAD;
2126 spin_unlock_bh(&ifp->lock);
2127
2128 addrconf_mod_dad_work(ifp, 0);
2129 in6_ifa_put(ifp);
2130}
2131
2132
2133
2134void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
2135{
2136 struct in6_addr maddr;
2137
2138 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2139 return;
2140
2141 addrconf_addr_solict_mult(addr, &maddr);
2142 ipv6_dev_mc_inc(dev, &maddr);
2143}
2144
2145
2146void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
2147{
2148 struct in6_addr maddr;
2149
2150 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
2151 return;
2152
2153 addrconf_addr_solict_mult(addr, &maddr);
2154 __ipv6_dev_mc_dec(idev, &maddr);
2155}
2156
2157
2158static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
2159{
2160 struct in6_addr addr;
2161
2162 if (ifp->prefix_len >= 127)
2163 return;
2164 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2165 if (ipv6_addr_any(&addr))
2166 return;
2167 __ipv6_dev_ac_inc(ifp->idev, &addr);
2168}
2169
2170
2171static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
2172{
2173 struct in6_addr addr;
2174
2175 if (ifp->prefix_len >= 127)
2176 return;
2177 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
2178 if (ipv6_addr_any(&addr))
2179 return;
2180 __ipv6_dev_ac_dec(ifp->idev, &addr);
2181}
2182
2183static int addrconf_ifid_6lowpan(u8 *eui, struct net_device *dev)
2184{
2185 switch (dev->addr_len) {
2186 case ETH_ALEN:
2187 memcpy(eui, dev->dev_addr, 3);
2188 eui[3] = 0xFF;
2189 eui[4] = 0xFE;
2190 memcpy(eui + 5, dev->dev_addr + 3, 3);
2191 break;
2192 case EUI64_ADDR_LEN:
2193 memcpy(eui, dev->dev_addr, EUI64_ADDR_LEN);
2194 eui[0] ^= 2;
2195 break;
2196 default:
2197 return -1;
2198 }
2199
2200 return 0;
2201}
2202
2203static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
2204{
2205 union fwnet_hwaddr *ha;
2206
2207 if (dev->addr_len != FWNET_ALEN)
2208 return -1;
2209
2210 ha = (union fwnet_hwaddr *)dev->dev_addr;
2211
2212 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
2213 eui[0] ^= 2;
2214 return 0;
2215}
2216
2217static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
2218{
2219
2220 if (dev->addr_len != ARCNET_ALEN)
2221 return -1;
2222 memset(eui, 0, 7);
2223 eui[7] = *(u8 *)dev->dev_addr;
2224 return 0;
2225}
2226
2227static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
2228{
2229 if (dev->addr_len != INFINIBAND_ALEN)
2230 return -1;
2231 memcpy(eui, dev->dev_addr + 12, 8);
2232 eui[0] |= 2;
2233 return 0;
2234}
2235
2236static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2237{
2238 if (addr == 0)
2239 return -1;
2240 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2241 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2242 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2243 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2244 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2245 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2246 eui[1] = 0;
2247 eui[2] = 0x5E;
2248 eui[3] = 0xFE;
2249 memcpy(eui + 4, &addr, 4);
2250 return 0;
2251}
2252
2253static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2254{
2255 if (dev->priv_flags & IFF_ISATAP)
2256 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2257 return -1;
2258}
2259
2260static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2261{
2262 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2263}
2264
2265static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2266{
2267 memcpy(eui, dev->perm_addr, 3);
2268 memcpy(eui + 5, dev->perm_addr + 3, 3);
2269 eui[3] = 0xFF;
2270 eui[4] = 0xFE;
2271 eui[0] ^= 2;
2272 return 0;
2273}
2274
2275static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2276{
2277 switch (dev->type) {
2278 case ARPHRD_ETHER:
2279 case ARPHRD_FDDI:
2280 return addrconf_ifid_eui48(eui, dev);
2281 case ARPHRD_ARCNET:
2282 return addrconf_ifid_arcnet(eui, dev);
2283 case ARPHRD_INFINIBAND:
2284 return addrconf_ifid_infiniband(eui, dev);
2285 case ARPHRD_SIT:
2286 return addrconf_ifid_sit(eui, dev);
2287 case ARPHRD_IPGRE:
2288 case ARPHRD_TUNNEL:
2289 return addrconf_ifid_gre(eui, dev);
2290 case ARPHRD_6LOWPAN:
2291 return addrconf_ifid_6lowpan(eui, dev);
2292 case ARPHRD_IEEE1394:
2293 return addrconf_ifid_ieee1394(eui, dev);
2294 case ARPHRD_TUNNEL6:
2295 case ARPHRD_IP6GRE:
2296 case ARPHRD_RAWIP:
2297 return addrconf_ifid_ip6tnl(eui, dev);
2298 }
2299 return -1;
2300}
2301
2302static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2303{
2304 int err = -1;
2305 struct inet6_ifaddr *ifp;
2306
2307 read_lock_bh(&idev->lock);
2308 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2309 if (ifp->scope > IFA_LINK)
2310 break;
2311 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2312 memcpy(eui, ifp->addr.s6_addr+8, 8);
2313 err = 0;
2314 break;
2315 }
2316 }
2317 read_unlock_bh(&idev->lock);
2318 return err;
2319}
2320
2321
2322
2323
2324
2325static void ipv6_gen_rnd_iid(struct in6_addr *addr)
2326{
2327regen:
2328 get_random_bytes(&addr->s6_addr[8], 8);
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338 if (!(addr->s6_addr32[2] | addr->s6_addr32[3]))
2339 goto regen;
2340
2341
2342
2343
2344
2345 if (ntohl(addr->s6_addr32[2]) == 0x02005eff &&
2346 (ntohl(addr->s6_addr32[3]) & 0Xff000000) == 0xfe000000)
2347 goto regen;
2348
2349
2350 if (ntohl(addr->s6_addr32[2]) == 0xfdffffff &&
2351 ntohl(addr->s6_addr32[3]) >= 0Xffffff80)
2352 goto regen;
2353}
2354
2355
2356
2357
2358
2359static void
2360addrconf_prefix_route(struct in6_addr *pfx, int plen, u32 metric,
2361 struct net_device *dev, unsigned long expires,
2362 u32 flags, gfp_t gfp_flags)
2363{
2364 struct fib6_config cfg = {
2365 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2366 .fc_metric = metric ? : IP6_RT_PRIO_ADDRCONF,
2367 .fc_ifindex = dev->ifindex,
2368 .fc_expires = expires,
2369 .fc_dst_len = plen,
2370 .fc_flags = RTF_UP | flags,
2371 .fc_nlinfo.nl_net = dev_net(dev),
2372 .fc_protocol = RTPROT_KERNEL,
2373 .fc_type = RTN_UNICAST,
2374 };
2375
2376 cfg.fc_dst = *pfx;
2377
2378
2379
2380
2381
2382#if IS_ENABLED(CONFIG_IPV6_SIT)
2383 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2384 cfg.fc_flags |= RTF_NONEXTHOP;
2385#endif
2386
2387 ip6_route_add(&cfg, gfp_flags, NULL);
2388}
2389
2390
2391static struct fib6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2392 int plen,
2393 const struct net_device *dev,
2394 u32 flags, u32 noflags,
2395 bool no_gw)
2396{
2397 struct fib6_node *fn;
2398 struct fib6_info *rt = NULL;
2399 struct fib6_table *table;
2400 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2401
2402 table = fib6_get_table(dev_net(dev), tb_id);
2403 if (!table)
2404 return NULL;
2405
2406 rcu_read_lock();
2407 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0, true);
2408 if (!fn)
2409 goto out;
2410
2411 for_each_fib6_node_rt_rcu(fn) {
2412
2413 if (rt->nh)
2414 continue;
2415
2416 if (rt->fib6_nh->fib_nh_dev->ifindex != dev->ifindex)
2417 continue;
2418 if (no_gw && rt->fib6_nh->fib_nh_gw_family)
2419 continue;
2420 if ((rt->fib6_flags & flags) != flags)
2421 continue;
2422 if ((rt->fib6_flags & noflags) != 0)
2423 continue;
2424 if (!fib6_info_hold_safe(rt))
2425 continue;
2426 break;
2427 }
2428out:
2429 rcu_read_unlock();
2430 return rt;
2431}
2432
2433
2434
2435
2436static void addrconf_add_mroute(struct net_device *dev)
2437{
2438 struct fib6_config cfg = {
2439 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2440 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2441 .fc_ifindex = dev->ifindex,
2442 .fc_dst_len = 8,
2443 .fc_flags = RTF_UP,
2444 .fc_type = RTN_UNICAST,
2445 .fc_nlinfo.nl_net = dev_net(dev),
2446 };
2447
2448 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2449
2450 ip6_route_add(&cfg, GFP_KERNEL, NULL);
2451}
2452
2453static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2454{
2455 struct inet6_dev *idev;
2456
2457 ASSERT_RTNL();
2458
2459 idev = ipv6_find_idev(dev);
2460 if (IS_ERR(idev))
2461 return idev;
2462
2463 if (idev->cnf.disable_ipv6)
2464 return ERR_PTR(-EACCES);
2465
2466
2467 if (!(dev->flags & IFF_LOOPBACK) && !netif_is_l3_master(dev))
2468 addrconf_add_mroute(dev);
2469
2470 return idev;
2471}
2472
2473static void manage_tempaddrs(struct inet6_dev *idev,
2474 struct inet6_ifaddr *ifp,
2475 __u32 valid_lft, __u32 prefered_lft,
2476 bool create, unsigned long now)
2477{
2478 u32 flags;
2479 struct inet6_ifaddr *ift;
2480
2481 read_lock_bh(&idev->lock);
2482
2483 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2484 int age, max_valid, max_prefered;
2485
2486 if (ifp != ift->ifpub)
2487 continue;
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497 age = (now - ift->cstamp) / HZ;
2498 max_valid = idev->cnf.temp_valid_lft - age;
2499 if (max_valid < 0)
2500 max_valid = 0;
2501
2502 max_prefered = idev->cnf.temp_prefered_lft -
2503 idev->desync_factor - age;
2504 if (max_prefered < 0)
2505 max_prefered = 0;
2506
2507 if (valid_lft > max_valid)
2508 valid_lft = max_valid;
2509
2510 if (prefered_lft > max_prefered)
2511 prefered_lft = max_prefered;
2512
2513 spin_lock(&ift->lock);
2514 flags = ift->flags;
2515 ift->valid_lft = valid_lft;
2516 ift->prefered_lft = prefered_lft;
2517 ift->tstamp = now;
2518 if (prefered_lft > 0)
2519 ift->flags &= ~IFA_F_DEPRECATED;
2520
2521 spin_unlock(&ift->lock);
2522 if (!(flags&IFA_F_TENTATIVE))
2523 ipv6_ifa_notify(0, ift);
2524 }
2525
2526 if ((create || list_empty(&idev->tempaddr_list)) &&
2527 idev->cnf.use_tempaddr > 0) {
2528
2529
2530
2531
2532
2533 read_unlock_bh(&idev->lock);
2534 ipv6_create_tempaddr(ifp, false);
2535 } else {
2536 read_unlock_bh(&idev->lock);
2537 }
2538}
2539
2540static bool is_addr_mode_generate_stable(struct inet6_dev *idev)
2541{
2542 return idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY ||
2543 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_RANDOM;
2544}
2545
2546int addrconf_prefix_rcv_add_addr(struct net *net, struct net_device *dev,
2547 const struct prefix_info *pinfo,
2548 struct inet6_dev *in6_dev,
2549 const struct in6_addr *addr, int addr_type,
2550 u32 addr_flags, bool sllao, bool tokenized,
2551 __u32 valid_lft, u32 prefered_lft)
2552{
2553 struct inet6_ifaddr *ifp = ipv6_get_ifaddr(net, addr, dev, 1);
2554 int create = 0;
2555
2556 if (!ifp && valid_lft) {
2557 int max_addresses = in6_dev->cnf.max_addresses;
2558 struct ifa6_config cfg = {
2559 .pfx = addr,
2560 .plen = pinfo->prefix_len,
2561 .ifa_flags = addr_flags,
2562 .valid_lft = valid_lft,
2563 .preferred_lft = prefered_lft,
2564 .scope = addr_type & IPV6_ADDR_SCOPE_MASK,
2565 };
2566
2567#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2568 if ((net->ipv6.devconf_all->optimistic_dad ||
2569 in6_dev->cnf.optimistic_dad) &&
2570 !net->ipv6.devconf_all->forwarding && sllao)
2571 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
2572#endif
2573
2574
2575
2576
2577 if (!max_addresses ||
2578 ipv6_count_addresses(in6_dev) < max_addresses)
2579 ifp = ipv6_add_addr(in6_dev, &cfg, false, NULL);
2580
2581 if (IS_ERR_OR_NULL(ifp))
2582 return -1;
2583
2584 create = 1;
2585 spin_lock_bh(&ifp->lock);
2586 ifp->flags |= IFA_F_MANAGETEMPADDR;
2587 ifp->cstamp = jiffies;
2588 ifp->tokenized = tokenized;
2589 spin_unlock_bh(&ifp->lock);
2590 addrconf_dad_start(ifp);
2591 }
2592
2593 if (ifp) {
2594 u32 flags;
2595 unsigned long now;
2596 u32 stored_lft;
2597
2598
2599
2600
2601
2602
2603 spin_lock_bh(&ifp->lock);
2604 now = jiffies;
2605 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2606 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2607 else
2608 stored_lft = 0;
2609
2610 if (!create && stored_lft) {
2611 ifp->valid_lft = valid_lft;
2612 ifp->prefered_lft = prefered_lft;
2613 ifp->tstamp = now;
2614 flags = ifp->flags;
2615 ifp->flags &= ~IFA_F_DEPRECATED;
2616 spin_unlock_bh(&ifp->lock);
2617
2618 if (!(flags&IFA_F_TENTATIVE))
2619 ipv6_ifa_notify(0, ifp);
2620 } else
2621 spin_unlock_bh(&ifp->lock);
2622
2623 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2624 create, now);
2625
2626 in6_ifa_put(ifp);
2627 addrconf_verify();
2628 }
2629
2630 return 0;
2631}
2632EXPORT_SYMBOL_GPL(addrconf_prefix_rcv_add_addr);
2633
2634void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2635{
2636 struct prefix_info *pinfo;
2637 __u32 valid_lft;
2638 __u32 prefered_lft;
2639 int addr_type, err;
2640 u32 addr_flags = 0;
2641 struct inet6_dev *in6_dev;
2642 struct net *net = dev_net(dev);
2643
2644 pinfo = (struct prefix_info *) opt;
2645
2646 if (len < sizeof(struct prefix_info)) {
2647 netdev_dbg(dev, "addrconf: prefix option too short\n");
2648 return;
2649 }
2650
2651
2652
2653
2654
2655 addr_type = ipv6_addr_type(&pinfo->prefix);
2656
2657 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2658 return;
2659
2660 valid_lft = ntohl(pinfo->valid);
2661 prefered_lft = ntohl(pinfo->prefered);
2662
2663 if (prefered_lft > valid_lft) {
2664 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2665 return;
2666 }
2667
2668 in6_dev = in6_dev_get(dev);
2669
2670 if (!in6_dev) {
2671 net_dbg_ratelimited("addrconf: device %s not configured\n",
2672 dev->name);
2673 return;
2674 }
2675
2676
2677
2678
2679
2680
2681
2682 if (pinfo->onlink) {
2683 struct fib6_info *rt;
2684 unsigned long rt_expires;
2685
2686
2687
2688
2689
2690
2691 if (HZ > USER_HZ)
2692 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2693 else
2694 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2695
2696 if (addrconf_finite_timeout(rt_expires))
2697 rt_expires *= HZ;
2698
2699 rt = addrconf_get_prefix_route(&pinfo->prefix,
2700 pinfo->prefix_len,
2701 dev,
2702 RTF_ADDRCONF | RTF_PREFIX_RT,
2703 RTF_DEFAULT, true);
2704
2705 if (rt) {
2706
2707 if (valid_lft == 0) {
2708 ip6_del_rt(net, rt, false);
2709 rt = NULL;
2710 } else if (addrconf_finite_timeout(rt_expires)) {
2711
2712 fib6_set_expires(rt, jiffies + rt_expires);
2713 } else {
2714 fib6_clean_expires(rt);
2715 }
2716 } else if (valid_lft) {
2717 clock_t expires = 0;
2718 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2719 if (addrconf_finite_timeout(rt_expires)) {
2720
2721 flags |= RTF_EXPIRES;
2722 expires = jiffies_to_clock_t(rt_expires);
2723 }
2724 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2725 0, dev, expires, flags,
2726 GFP_ATOMIC);
2727 }
2728 fib6_info_release(rt);
2729 }
2730
2731
2732
2733 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2734 struct in6_addr addr;
2735 bool tokenized = false, dev_addr_generated = false;
2736
2737 if (pinfo->prefix_len == 64) {
2738 memcpy(&addr, &pinfo->prefix, 8);
2739
2740 if (!ipv6_addr_any(&in6_dev->token)) {
2741 read_lock_bh(&in6_dev->lock);
2742 memcpy(addr.s6_addr + 8,
2743 in6_dev->token.s6_addr + 8, 8);
2744 read_unlock_bh(&in6_dev->lock);
2745 tokenized = true;
2746 } else if (is_addr_mode_generate_stable(in6_dev) &&
2747 !ipv6_generate_stable_address(&addr, 0,
2748 in6_dev)) {
2749 addr_flags |= IFA_F_STABLE_PRIVACY;
2750 goto ok;
2751 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2752 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2753 goto put;
2754 } else {
2755 dev_addr_generated = true;
2756 }
2757 goto ok;
2758 }
2759 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2760 pinfo->prefix_len);
2761 goto put;
2762
2763ok:
2764 err = addrconf_prefix_rcv_add_addr(net, dev, pinfo, in6_dev,
2765 &addr, addr_type,
2766 addr_flags, sllao,
2767 tokenized, valid_lft,
2768 prefered_lft);
2769 if (err)
2770 goto put;
2771
2772
2773
2774
2775 ndisc_ops_prefix_rcv_add_addr(net, dev, pinfo, in6_dev, &addr,
2776 addr_type, addr_flags, sllao,
2777 tokenized, valid_lft,
2778 prefered_lft,
2779 dev_addr_generated);
2780 }
2781 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2782put:
2783 in6_dev_put(in6_dev);
2784}
2785
2786static int addrconf_set_sit_dstaddr(struct net *net, struct net_device *dev,
2787 struct in6_ifreq *ireq)
2788{
2789 struct ip_tunnel_parm p = { };
2790 int err;
2791
2792 if (!(ipv6_addr_type(&ireq->ifr6_addr) & IPV6_ADDR_COMPATv4))
2793 return -EADDRNOTAVAIL;
2794
2795 p.iph.daddr = ireq->ifr6_addr.s6_addr32[3];
2796 p.iph.version = 4;
2797 p.iph.ihl = 5;
2798 p.iph.protocol = IPPROTO_IPV6;
2799 p.iph.ttl = 64;
2800
2801 if (!dev->netdev_ops->ndo_tunnel_ctl)
2802 return -EOPNOTSUPP;
2803 err = dev->netdev_ops->ndo_tunnel_ctl(dev, &p, SIOCADDTUNNEL);
2804 if (err)
2805 return err;
2806
2807 dev = __dev_get_by_name(net, p.name);
2808 if (!dev)
2809 return -ENOBUFS;
2810 return dev_open(dev, NULL);
2811}
2812
2813
2814
2815
2816
2817
2818int addrconf_set_dstaddr(struct net *net, void __user *arg)
2819{
2820 struct net_device *dev;
2821 struct in6_ifreq ireq;
2822 int err = -ENODEV;
2823
2824 if (!IS_ENABLED(CONFIG_IPV6_SIT))
2825 return -ENODEV;
2826 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2827 return -EFAULT;
2828
2829 rtnl_lock();
2830 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2831 if (dev && dev->type == ARPHRD_SIT)
2832 err = addrconf_set_sit_dstaddr(net, dev, &ireq);
2833 rtnl_unlock();
2834 return err;
2835}
2836
2837static int ipv6_mc_config(struct sock *sk, bool join,
2838 const struct in6_addr *addr, int ifindex)
2839{
2840 int ret;
2841
2842 ASSERT_RTNL();
2843
2844 lock_sock(sk);
2845 if (join)
2846 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2847 else
2848 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2849 release_sock(sk);
2850
2851 return ret;
2852}
2853
2854
2855
2856
2857static int inet6_addr_add(struct net *net, int ifindex,
2858 struct ifa6_config *cfg,
2859 struct netlink_ext_ack *extack)
2860{
2861 struct inet6_ifaddr *ifp;
2862 struct inet6_dev *idev;
2863 struct net_device *dev;
2864 unsigned long timeout;
2865 clock_t expires;
2866 u32 flags;
2867
2868 ASSERT_RTNL();
2869
2870 if (cfg->plen > 128)
2871 return -EINVAL;
2872
2873
2874 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
2875 return -EINVAL;
2876
2877 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR && cfg->plen != 64)
2878 return -EINVAL;
2879
2880 dev = __dev_get_by_index(net, ifindex);
2881 if (!dev)
2882 return -ENODEV;
2883
2884 idev = addrconf_add_dev(dev);
2885 if (IS_ERR(idev))
2886 return PTR_ERR(idev);
2887
2888 if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2889 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2890 true, cfg->pfx, ifindex);
2891
2892 if (ret < 0)
2893 return ret;
2894 }
2895
2896 cfg->scope = ipv6_addr_scope(cfg->pfx);
2897
2898 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
2899 if (addrconf_finite_timeout(timeout)) {
2900 expires = jiffies_to_clock_t(timeout * HZ);
2901 cfg->valid_lft = timeout;
2902 flags = RTF_EXPIRES;
2903 } else {
2904 expires = 0;
2905 flags = 0;
2906 cfg->ifa_flags |= IFA_F_PERMANENT;
2907 }
2908
2909 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
2910 if (addrconf_finite_timeout(timeout)) {
2911 if (timeout == 0)
2912 cfg->ifa_flags |= IFA_F_DEPRECATED;
2913 cfg->preferred_lft = timeout;
2914 }
2915
2916 ifp = ipv6_add_addr(idev, cfg, true, extack);
2917 if (!IS_ERR(ifp)) {
2918 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
2919 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
2920 ifp->rt_priority, dev, expires,
2921 flags, GFP_KERNEL);
2922 }
2923
2924
2925
2926
2927 if (!(ifp->flags & (IFA_F_OPTIMISTIC | IFA_F_NODAD)))
2928 ipv6_ifa_notify(0, ifp);
2929
2930
2931
2932
2933
2934 addrconf_dad_start(ifp);
2935 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR)
2936 manage_tempaddrs(idev, ifp, cfg->valid_lft,
2937 cfg->preferred_lft, true, jiffies);
2938 in6_ifa_put(ifp);
2939 addrconf_verify_rtnl();
2940 return 0;
2941 } else if (cfg->ifa_flags & IFA_F_MCAUTOJOIN) {
2942 ipv6_mc_config(net->ipv6.mc_autojoin_sk, false,
2943 cfg->pfx, ifindex);
2944 }
2945
2946 return PTR_ERR(ifp);
2947}
2948
2949static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2950 const struct in6_addr *pfx, unsigned int plen)
2951{
2952 struct inet6_ifaddr *ifp;
2953 struct inet6_dev *idev;
2954 struct net_device *dev;
2955
2956 if (plen > 128)
2957 return -EINVAL;
2958
2959 dev = __dev_get_by_index(net, ifindex);
2960 if (!dev)
2961 return -ENODEV;
2962
2963 idev = __in6_dev_get(dev);
2964 if (!idev)
2965 return -ENXIO;
2966
2967 read_lock_bh(&idev->lock);
2968 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2969 if (ifp->prefix_len == plen &&
2970 ipv6_addr_equal(pfx, &ifp->addr)) {
2971 in6_ifa_hold(ifp);
2972 read_unlock_bh(&idev->lock);
2973
2974 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2975 (ifa_flags & IFA_F_MANAGETEMPADDR))
2976 manage_tempaddrs(idev, ifp, 0, 0, false,
2977 jiffies);
2978 ipv6_del_addr(ifp);
2979 addrconf_verify_rtnl();
2980 if (ipv6_addr_is_multicast(pfx)) {
2981 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2982 false, pfx, dev->ifindex);
2983 }
2984 return 0;
2985 }
2986 }
2987 read_unlock_bh(&idev->lock);
2988 return -EADDRNOTAVAIL;
2989}
2990
2991
2992int addrconf_add_ifaddr(struct net *net, void __user *arg)
2993{
2994 struct ifa6_config cfg = {
2995 .ifa_flags = IFA_F_PERMANENT,
2996 .preferred_lft = INFINITY_LIFE_TIME,
2997 .valid_lft = INFINITY_LIFE_TIME,
2998 };
2999 struct in6_ifreq ireq;
3000 int err;
3001
3002 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3003 return -EPERM;
3004
3005 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3006 return -EFAULT;
3007
3008 cfg.pfx = &ireq.ifr6_addr;
3009 cfg.plen = ireq.ifr6_prefixlen;
3010
3011 rtnl_lock();
3012 err = inet6_addr_add(net, ireq.ifr6_ifindex, &cfg, NULL);
3013 rtnl_unlock();
3014 return err;
3015}
3016
3017int addrconf_del_ifaddr(struct net *net, void __user *arg)
3018{
3019 struct in6_ifreq ireq;
3020 int err;
3021
3022 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
3023 return -EPERM;
3024
3025 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
3026 return -EFAULT;
3027
3028 rtnl_lock();
3029 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
3030 ireq.ifr6_prefixlen);
3031 rtnl_unlock();
3032 return err;
3033}
3034
3035static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
3036 int plen, int scope)
3037{
3038 struct inet6_ifaddr *ifp;
3039 struct ifa6_config cfg = {
3040 .pfx = addr,
3041 .plen = plen,
3042 .ifa_flags = IFA_F_PERMANENT,
3043 .valid_lft = INFINITY_LIFE_TIME,
3044 .preferred_lft = INFINITY_LIFE_TIME,
3045 .scope = scope
3046 };
3047
3048 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3049 if (!IS_ERR(ifp)) {
3050 spin_lock_bh(&ifp->lock);
3051 ifp->flags &= ~IFA_F_TENTATIVE;
3052 spin_unlock_bh(&ifp->lock);
3053 rt_genid_bump_ipv6(dev_net(idev->dev));
3054 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3055 in6_ifa_put(ifp);
3056 }
3057}
3058
3059#if IS_ENABLED(CONFIG_IPV6_SIT)
3060static void sit_add_v4_addrs(struct inet6_dev *idev)
3061{
3062 struct in6_addr addr;
3063 struct net_device *dev;
3064 struct net *net = dev_net(idev->dev);
3065 int scope, plen;
3066 u32 pflags = 0;
3067
3068 ASSERT_RTNL();
3069
3070 memset(&addr, 0, sizeof(struct in6_addr));
3071 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
3072
3073 if (idev->dev->flags&IFF_POINTOPOINT) {
3074 addr.s6_addr32[0] = htonl(0xfe800000);
3075 scope = IFA_LINK;
3076 plen = 64;
3077 } else {
3078 scope = IPV6_ADDR_COMPATv4;
3079 plen = 96;
3080 pflags |= RTF_NONEXTHOP;
3081 }
3082
3083 if (addr.s6_addr32[3]) {
3084 add_addr(idev, &addr, plen, scope);
3085 addrconf_prefix_route(&addr, plen, 0, idev->dev, 0, pflags,
3086 GFP_KERNEL);
3087 return;
3088 }
3089
3090 for_each_netdev(net, dev) {
3091 struct in_device *in_dev = __in_dev_get_rtnl(dev);
3092 if (in_dev && (dev->flags & IFF_UP)) {
3093 struct in_ifaddr *ifa;
3094 int flag = scope;
3095
3096 in_dev_for_each_ifa_rtnl(ifa, in_dev) {
3097 addr.s6_addr32[3] = ifa->ifa_local;
3098
3099 if (ifa->ifa_scope == RT_SCOPE_LINK)
3100 continue;
3101 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
3102 if (idev->dev->flags&IFF_POINTOPOINT)
3103 continue;
3104 flag |= IFA_HOST;
3105 }
3106
3107 add_addr(idev, &addr, plen, flag);
3108 addrconf_prefix_route(&addr, plen, 0, idev->dev,
3109 0, pflags, GFP_KERNEL);
3110 }
3111 }
3112 }
3113}
3114#endif
3115
3116static void init_loopback(struct net_device *dev)
3117{
3118 struct inet6_dev *idev;
3119
3120
3121
3122 ASSERT_RTNL();
3123
3124 idev = ipv6_find_idev(dev);
3125 if (IS_ERR(idev)) {
3126 pr_debug("%s: add_dev failed\n", __func__);
3127 return;
3128 }
3129
3130 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
3131}
3132
3133void addrconf_add_linklocal(struct inet6_dev *idev,
3134 const struct in6_addr *addr, u32 flags)
3135{
3136 struct ifa6_config cfg = {
3137 .pfx = addr,
3138 .plen = 64,
3139 .ifa_flags = flags | IFA_F_PERMANENT,
3140 .valid_lft = INFINITY_LIFE_TIME,
3141 .preferred_lft = INFINITY_LIFE_TIME,
3142 .scope = IFA_LINK
3143 };
3144 struct inet6_ifaddr *ifp;
3145
3146#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
3147 if ((dev_net(idev->dev)->ipv6.devconf_all->optimistic_dad ||
3148 idev->cnf.optimistic_dad) &&
3149 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
3150 cfg.ifa_flags |= IFA_F_OPTIMISTIC;
3151#endif
3152
3153 ifp = ipv6_add_addr(idev, &cfg, true, NULL);
3154 if (!IS_ERR(ifp)) {
3155 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, 0, idev->dev,
3156 0, 0, GFP_ATOMIC);
3157 addrconf_dad_start(ifp);
3158 in6_ifa_put(ifp);
3159 }
3160}
3161EXPORT_SYMBOL_GPL(addrconf_add_linklocal);
3162
3163static bool ipv6_reserved_interfaceid(struct in6_addr address)
3164{
3165 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
3166 return true;
3167
3168 if (address.s6_addr32[2] == htonl(0x02005eff) &&
3169 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
3170 return true;
3171
3172 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
3173 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
3174 return true;
3175
3176 return false;
3177}
3178
3179static int ipv6_generate_stable_address(struct in6_addr *address,
3180 u8 dad_count,
3181 const struct inet6_dev *idev)
3182{
3183 static DEFINE_SPINLOCK(lock);
3184 static __u32 digest[SHA1_DIGEST_WORDS];
3185 static __u32 workspace[SHA1_WORKSPACE_WORDS];
3186
3187 static union {
3188 char __data[SHA1_BLOCK_SIZE];
3189 struct {
3190 struct in6_addr secret;
3191 __be32 prefix[2];
3192 unsigned char hwaddr[MAX_ADDR_LEN];
3193 u8 dad_count;
3194 } __packed;
3195 } data;
3196
3197 struct in6_addr secret;
3198 struct in6_addr temp;
3199 struct net *net = dev_net(idev->dev);
3200
3201 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3202
3203 if (idev->cnf.stable_secret.initialized)
3204 secret = idev->cnf.stable_secret.secret;
3205 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3206 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3207 else
3208 return -1;
3209
3210retry:
3211 spin_lock_bh(&lock);
3212
3213 sha1_init(digest);
3214 memset(&data, 0, sizeof(data));
3215 memset(workspace, 0, sizeof(workspace));
3216 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3217 data.prefix[0] = address->s6_addr32[0];
3218 data.prefix[1] = address->s6_addr32[1];
3219 data.secret = secret;
3220 data.dad_count = dad_count;
3221
3222 sha1_transform(digest, data.__data, workspace);
3223
3224 temp = *address;
3225 temp.s6_addr32[2] = (__force __be32)digest[0];
3226 temp.s6_addr32[3] = (__force __be32)digest[1];
3227
3228 spin_unlock_bh(&lock);
3229
3230 if (ipv6_reserved_interfaceid(temp)) {
3231 dad_count++;
3232 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3233 return -1;
3234 goto retry;
3235 }
3236
3237 *address = temp;
3238 return 0;
3239}
3240
3241static void ipv6_gen_mode_random_init(struct inet6_dev *idev)
3242{
3243 struct ipv6_stable_secret *s = &idev->cnf.stable_secret;
3244
3245 if (s->initialized)
3246 return;
3247 s = &idev->cnf.stable_secret;
3248 get_random_bytes(&s->secret, sizeof(s->secret));
3249 s->initialized = true;
3250}
3251
3252static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3253{
3254 struct in6_addr addr;
3255
3256
3257 if (netif_is_l3_master(idev->dev))
3258 return;
3259
3260
3261 if (idev->dev->flags & IFF_SLAVE)
3262 return;
3263
3264 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3265
3266 switch (idev->cnf.addr_gen_mode) {
3267 case IN6_ADDR_GEN_MODE_RANDOM:
3268 ipv6_gen_mode_random_init(idev);
3269 fallthrough;
3270 case IN6_ADDR_GEN_MODE_STABLE_PRIVACY:
3271 if (!ipv6_generate_stable_address(&addr, 0, idev))
3272 addrconf_add_linklocal(idev, &addr,
3273 IFA_F_STABLE_PRIVACY);
3274 else if (prefix_route)
3275 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3276 0, 0, GFP_KERNEL);
3277 break;
3278 case IN6_ADDR_GEN_MODE_EUI64:
3279
3280
3281
3282
3283 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3284 addrconf_add_linklocal(idev, &addr, 0);
3285 else if (prefix_route)
3286 addrconf_prefix_route(&addr, 64, 0, idev->dev,
3287 0, 0, GFP_KERNEL);
3288 break;
3289 case IN6_ADDR_GEN_MODE_NONE:
3290 default:
3291
3292 break;
3293 }
3294}
3295
3296static void addrconf_dev_config(struct net_device *dev)
3297{
3298 struct inet6_dev *idev;
3299
3300 ASSERT_RTNL();
3301
3302 if ((dev->type != ARPHRD_ETHER) &&
3303 (dev->type != ARPHRD_FDDI) &&
3304 (dev->type != ARPHRD_ARCNET) &&
3305 (dev->type != ARPHRD_INFINIBAND) &&
3306 (dev->type != ARPHRD_IEEE1394) &&
3307 (dev->type != ARPHRD_TUNNEL6) &&
3308 (dev->type != ARPHRD_6LOWPAN) &&
3309 (dev->type != ARPHRD_IP6GRE) &&
3310 (dev->type != ARPHRD_IPGRE) &&
3311 (dev->type != ARPHRD_TUNNEL) &&
3312 (dev->type != ARPHRD_NONE) &&
3313 (dev->type != ARPHRD_RAWIP)) {
3314
3315 idev = __in6_dev_get(dev);
3316 if (!IS_ERR_OR_NULL(idev) && dev->flags & IFF_UP &&
3317 dev->flags & IFF_MULTICAST)
3318 ipv6_mc_up(idev);
3319 return;
3320 }
3321
3322 idev = addrconf_add_dev(dev);
3323 if (IS_ERR(idev))
3324 return;
3325
3326
3327 if (dev->type == ARPHRD_NONE &&
3328 idev->cnf.addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64)
3329 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_RANDOM;
3330
3331 addrconf_addr_gen(idev, false);
3332}
3333
3334#if IS_ENABLED(CONFIG_IPV6_SIT)
3335static void addrconf_sit_config(struct net_device *dev)
3336{
3337 struct inet6_dev *idev;
3338
3339 ASSERT_RTNL();
3340
3341
3342
3343
3344
3345
3346
3347 idev = ipv6_find_idev(dev);
3348 if (IS_ERR(idev)) {
3349 pr_debug("%s: add_dev failed\n", __func__);
3350 return;
3351 }
3352
3353 if (dev->priv_flags & IFF_ISATAP) {
3354 addrconf_addr_gen(idev, false);
3355 return;
3356 }
3357
3358 sit_add_v4_addrs(idev);
3359
3360 if (dev->flags&IFF_POINTOPOINT)
3361 addrconf_add_mroute(dev);
3362}
3363#endif
3364
3365#if IS_ENABLED(CONFIG_NET_IPGRE)
3366static void addrconf_gre_config(struct net_device *dev)
3367{
3368 struct inet6_dev *idev;
3369
3370 ASSERT_RTNL();
3371
3372 idev = ipv6_find_idev(dev);
3373 if (IS_ERR(idev)) {
3374 pr_debug("%s: add_dev failed\n", __func__);
3375 return;
3376 }
3377
3378 addrconf_addr_gen(idev, true);
3379 if (dev->flags & IFF_POINTOPOINT)
3380 addrconf_add_mroute(dev);
3381}
3382#endif
3383
3384static int fixup_permanent_addr(struct net *net,
3385 struct inet6_dev *idev,
3386 struct inet6_ifaddr *ifp)
3387{
3388
3389
3390
3391
3392 if (!ifp->rt || !ifp->rt->fib6_node) {
3393 struct fib6_info *f6i, *prev;
3394
3395 f6i = addrconf_f6i_alloc(net, idev, &ifp->addr, false,
3396 GFP_ATOMIC);
3397 if (IS_ERR(f6i))
3398 return PTR_ERR(f6i);
3399
3400
3401 spin_lock(&ifp->lock);
3402 prev = ifp->rt;
3403 ifp->rt = f6i;
3404 spin_unlock(&ifp->lock);
3405
3406 fib6_info_release(prev);
3407 }
3408
3409 if (!(ifp->flags & IFA_F_NOPREFIXROUTE)) {
3410 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
3411 ifp->rt_priority, idev->dev, 0, 0,
3412 GFP_ATOMIC);
3413 }
3414
3415 if (ifp->state == INET6_IFADDR_STATE_PREDAD)
3416 addrconf_dad_start(ifp);
3417
3418 return 0;
3419}
3420
3421static void addrconf_permanent_addr(struct net *net, struct net_device *dev)
3422{
3423 struct inet6_ifaddr *ifp, *tmp;
3424 struct inet6_dev *idev;
3425
3426 idev = __in6_dev_get(dev);
3427 if (!idev)
3428 return;
3429
3430 write_lock_bh(&idev->lock);
3431
3432 list_for_each_entry_safe(ifp, tmp, &idev->addr_list, if_list) {
3433 if ((ifp->flags & IFA_F_PERMANENT) &&
3434 fixup_permanent_addr(net, idev, ifp) < 0) {
3435 write_unlock_bh(&idev->lock);
3436 in6_ifa_hold(ifp);
3437 ipv6_del_addr(ifp);
3438 write_lock_bh(&idev->lock);
3439
3440 net_info_ratelimited("%s: Failed to add prefix route for address %pI6c; dropping\n",
3441 idev->dev->name, &ifp->addr);
3442 }
3443 }
3444
3445 write_unlock_bh(&idev->lock);
3446}
3447
3448static int addrconf_notify(struct notifier_block *this, unsigned long event,
3449 void *ptr)
3450{
3451 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3452 struct netdev_notifier_change_info *change_info;
3453 struct netdev_notifier_changeupper_info *info;
3454 struct inet6_dev *idev = __in6_dev_get(dev);
3455 struct net *net = dev_net(dev);
3456 int run_pending = 0;
3457 int err;
3458
3459 switch (event) {
3460 case NETDEV_REGISTER:
3461 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3462 idev = ipv6_add_dev(dev);
3463 if (IS_ERR(idev))
3464 return notifier_from_errno(PTR_ERR(idev));
3465 }
3466 break;
3467
3468 case NETDEV_CHANGEMTU:
3469
3470 if (dev->mtu < IPV6_MIN_MTU) {
3471 addrconf_ifdown(dev, dev != net->loopback_dev);
3472 break;
3473 }
3474
3475 if (idev) {
3476 rt6_mtu_change(dev, dev->mtu);
3477 idev->cnf.mtu6 = dev->mtu;
3478 break;
3479 }
3480
3481
3482 idev = ipv6_add_dev(dev);
3483 if (IS_ERR(idev))
3484 break;
3485
3486
3487 if (!(idev->if_flags & IF_READY))
3488 break;
3489
3490 run_pending = 1;
3491 fallthrough;
3492 case NETDEV_UP:
3493 case NETDEV_CHANGE:
3494 if (dev->flags & IFF_SLAVE)
3495 break;
3496
3497 if (idev && idev->cnf.disable_ipv6)
3498 break;
3499
3500 if (event == NETDEV_UP) {
3501
3502 addrconf_permanent_addr(net, dev);
3503
3504 if (!addrconf_link_ready(dev)) {
3505
3506 pr_debug("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3507 dev->name);
3508 break;
3509 }
3510
3511 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3512 idev = ipv6_add_dev(dev);
3513
3514 if (!IS_ERR_OR_NULL(idev)) {
3515 idev->if_flags |= IF_READY;
3516 run_pending = 1;
3517 }
3518 } else if (event == NETDEV_CHANGE) {
3519 if (!addrconf_link_ready(dev)) {
3520
3521 rt6_sync_down_dev(dev, event);
3522 break;
3523 }
3524
3525 if (!IS_ERR_OR_NULL(idev)) {
3526 if (idev->if_flags & IF_READY) {
3527
3528
3529
3530
3531
3532 ipv6_mc_up(idev);
3533 change_info = ptr;
3534 if (change_info->flags_changed & IFF_NOARP)
3535 addrconf_dad_run(idev, true);
3536 rt6_sync_up(dev, RTNH_F_LINKDOWN);
3537 break;
3538 }
3539 idev->if_flags |= IF_READY;
3540 }
3541
3542 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3543 dev->name);
3544
3545 run_pending = 1;
3546 }
3547
3548 switch (dev->type) {
3549#if IS_ENABLED(CONFIG_IPV6_SIT)
3550 case ARPHRD_SIT:
3551 addrconf_sit_config(dev);
3552 break;
3553#endif
3554#if IS_ENABLED(CONFIG_NET_IPGRE)
3555 case ARPHRD_IPGRE:
3556 addrconf_gre_config(dev);
3557 break;
3558#endif
3559 case ARPHRD_LOOPBACK:
3560 init_loopback(dev);
3561 break;
3562
3563 default:
3564 addrconf_dev_config(dev);
3565 break;
3566 }
3567
3568 if (!IS_ERR_OR_NULL(idev)) {
3569 if (run_pending)
3570 addrconf_dad_run(idev, false);
3571
3572
3573 rt6_sync_up(dev, RTNH_F_DEAD);
3574
3575
3576
3577
3578
3579
3580 if (idev->cnf.mtu6 != dev->mtu &&
3581 dev->mtu >= IPV6_MIN_MTU) {
3582 rt6_mtu_change(dev, dev->mtu);
3583 idev->cnf.mtu6 = dev->mtu;
3584 }
3585 idev->tstamp = jiffies;
3586 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3587
3588
3589
3590
3591
3592 if (dev->mtu < IPV6_MIN_MTU)
3593 addrconf_ifdown(dev, dev != net->loopback_dev);
3594 }
3595 break;
3596
3597 case NETDEV_DOWN:
3598 case NETDEV_UNREGISTER:
3599
3600
3601
3602 addrconf_ifdown(dev, event != NETDEV_DOWN);
3603 break;
3604
3605 case NETDEV_CHANGENAME:
3606 if (idev) {
3607 snmp6_unregister_dev(idev);
3608 addrconf_sysctl_unregister(idev);
3609 err = addrconf_sysctl_register(idev);
3610 if (err)
3611 return notifier_from_errno(err);
3612 err = snmp6_register_dev(idev);
3613 if (err) {
3614 addrconf_sysctl_unregister(idev);
3615 return notifier_from_errno(err);
3616 }
3617 }
3618 break;
3619
3620 case NETDEV_PRE_TYPE_CHANGE:
3621 case NETDEV_POST_TYPE_CHANGE:
3622 if (idev)
3623 addrconf_type_change(dev, event);
3624 break;
3625
3626 case NETDEV_CHANGEUPPER:
3627 info = ptr;
3628
3629
3630
3631
3632 if (info->upper_dev && netif_is_l3_master(info->upper_dev))
3633 addrconf_ifdown(dev, 0);
3634 }
3635
3636 return NOTIFY_OK;
3637}
3638
3639
3640
3641
3642static struct notifier_block ipv6_dev_notf = {
3643 .notifier_call = addrconf_notify,
3644 .priority = ADDRCONF_NOTIFY_PRIORITY,
3645};
3646
3647static void addrconf_type_change(struct net_device *dev, unsigned long event)
3648{
3649 struct inet6_dev *idev;
3650 ASSERT_RTNL();
3651
3652 idev = __in6_dev_get(dev);
3653
3654 if (event == NETDEV_POST_TYPE_CHANGE)
3655 ipv6_mc_remap(idev);
3656 else if (event == NETDEV_PRE_TYPE_CHANGE)
3657 ipv6_mc_unmap(idev);
3658}
3659
3660static bool addr_is_local(const struct in6_addr *addr)
3661{
3662 return ipv6_addr_type(addr) &
3663 (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_LOOPBACK);
3664}
3665
3666static int addrconf_ifdown(struct net_device *dev, int how)
3667{
3668 unsigned long event = how ? NETDEV_UNREGISTER : NETDEV_DOWN;
3669 struct net *net = dev_net(dev);
3670 struct inet6_dev *idev;
3671 struct inet6_ifaddr *ifa, *tmp;
3672 bool keep_addr = false;
3673 int state, i;
3674
3675 ASSERT_RTNL();
3676
3677 rt6_disable_ip(dev, event);
3678
3679 idev = __in6_dev_get(dev);
3680 if (!idev)
3681 return -ENODEV;
3682
3683
3684
3685
3686
3687 if (how) {
3688 idev->dead = 1;
3689
3690
3691 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3692
3693
3694 snmp6_unregister_dev(idev);
3695
3696 }
3697
3698
3699
3700
3701 if (!how && !idev->cnf.disable_ipv6) {
3702
3703 int _keep_addr = net->ipv6.devconf_all->keep_addr_on_down;
3704
3705 if (!_keep_addr)
3706 _keep_addr = idev->cnf.keep_addr_on_down;
3707
3708 keep_addr = (_keep_addr > 0);
3709 }
3710
3711
3712 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3713 struct hlist_head *h = &inet6_addr_lst[i];
3714
3715 spin_lock_bh(&addrconf_hash_lock);
3716restart:
3717 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3718 if (ifa->idev == idev) {
3719 addrconf_del_dad_work(ifa);
3720
3721
3722
3723 if (!keep_addr ||
3724 !(ifa->flags & IFA_F_PERMANENT) ||
3725 addr_is_local(&ifa->addr)) {
3726 hlist_del_init_rcu(&ifa->addr_lst);
3727 goto restart;
3728 }
3729 }
3730 }
3731 spin_unlock_bh(&addrconf_hash_lock);
3732 }
3733
3734 write_lock_bh(&idev->lock);
3735
3736 addrconf_del_rs_timer(idev);
3737
3738
3739 if (!how)
3740 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3741
3742
3743 while (!list_empty(&idev->tempaddr_list)) {
3744 ifa = list_first_entry(&idev->tempaddr_list,
3745 struct inet6_ifaddr, tmp_list);
3746 list_del(&ifa->tmp_list);
3747 write_unlock_bh(&idev->lock);
3748 spin_lock_bh(&ifa->lock);
3749
3750 if (ifa->ifpub) {
3751 in6_ifa_put(ifa->ifpub);
3752 ifa->ifpub = NULL;
3753 }
3754 spin_unlock_bh(&ifa->lock);
3755 in6_ifa_put(ifa);
3756 write_lock_bh(&idev->lock);
3757 }
3758
3759 list_for_each_entry_safe(ifa, tmp, &idev->addr_list, if_list) {
3760 struct fib6_info *rt = NULL;
3761 bool keep;
3762
3763 addrconf_del_dad_work(ifa);
3764
3765 keep = keep_addr && (ifa->flags & IFA_F_PERMANENT) &&
3766 !addr_is_local(&ifa->addr);
3767
3768 write_unlock_bh(&idev->lock);
3769 spin_lock_bh(&ifa->lock);
3770
3771 if (keep) {
3772
3773 state = INET6_IFADDR_STATE_DEAD;
3774 ifa->state = INET6_IFADDR_STATE_PREDAD;
3775 if (!(ifa->flags & IFA_F_NODAD))
3776 ifa->flags |= IFA_F_TENTATIVE;
3777
3778 rt = ifa->rt;
3779 ifa->rt = NULL;
3780 } else {
3781 state = ifa->state;
3782 ifa->state = INET6_IFADDR_STATE_DEAD;
3783 }
3784
3785 spin_unlock_bh(&ifa->lock);
3786
3787 if (rt)
3788 ip6_del_rt(net, rt, false);
3789
3790 if (state != INET6_IFADDR_STATE_DEAD) {
3791 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3792 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3793 } else {
3794 if (idev->cnf.forwarding)
3795 addrconf_leave_anycast(ifa);
3796 addrconf_leave_solict(ifa->idev, &ifa->addr);
3797 }
3798
3799 write_lock_bh(&idev->lock);
3800 if (!keep) {
3801 list_del_rcu(&ifa->if_list);
3802 in6_ifa_put(ifa);
3803 }
3804 }
3805
3806 write_unlock_bh(&idev->lock);
3807
3808
3809 if (how) {
3810 ipv6_ac_destroy_dev(idev);
3811 ipv6_mc_destroy_dev(idev);
3812 } else {
3813 ipv6_mc_down(idev);
3814 }
3815
3816 idev->tstamp = jiffies;
3817
3818
3819 if (how) {
3820 addrconf_sysctl_unregister(idev);
3821 neigh_parms_release(&nd_tbl, idev->nd_parms);
3822 neigh_ifdown(&nd_tbl, dev);
3823 in6_dev_put(idev);
3824 }
3825 return 0;
3826}
3827
3828static void addrconf_rs_timer(struct timer_list *t)
3829{
3830 struct inet6_dev *idev = from_timer(idev, t, rs_timer);
3831 struct net_device *dev = idev->dev;
3832 struct in6_addr lladdr;
3833
3834 write_lock(&idev->lock);
3835 if (idev->dead || !(idev->if_flags & IF_READY))
3836 goto out;
3837
3838 if (!ipv6_accept_ra(idev))
3839 goto out;
3840
3841
3842 if (idev->if_flags & IF_RA_RCVD)
3843 goto out;
3844
3845 if (idev->rs_probes++ < idev->cnf.rtr_solicits || idev->cnf.rtr_solicits < 0) {
3846 write_unlock(&idev->lock);
3847 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3848 ndisc_send_rs(dev, &lladdr,
3849 &in6addr_linklocal_allrouters);
3850 else
3851 goto put;
3852
3853 write_lock(&idev->lock);
3854 idev->rs_interval = rfc3315_s14_backoff_update(
3855 idev->rs_interval, idev->cnf.rtr_solicit_max_interval);
3856
3857 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3858 idev->cnf.rtr_solicits) ?
3859 idev->cnf.rtr_solicit_delay :
3860 idev->rs_interval);
3861 } else {
3862
3863
3864
3865
3866 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3867 }
3868
3869out:
3870 write_unlock(&idev->lock);
3871put:
3872 in6_dev_put(idev);
3873}
3874
3875
3876
3877
3878static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3879{
3880 unsigned long rand_num;
3881 struct inet6_dev *idev = ifp->idev;
3882 u64 nonce;
3883
3884 if (ifp->flags & IFA_F_OPTIMISTIC)
3885 rand_num = 0;
3886 else
3887 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3888
3889 nonce = 0;
3890 if (idev->cnf.enhanced_dad ||
3891 dev_net(idev->dev)->ipv6.devconf_all->enhanced_dad) {
3892 do
3893 get_random_bytes(&nonce, 6);
3894 while (nonce == 0);
3895 }
3896 ifp->dad_nonce = nonce;
3897 ifp->dad_probes = idev->cnf.dad_transmits;
3898 addrconf_mod_dad_work(ifp, rand_num);
3899}
3900
3901static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3902{
3903 struct inet6_dev *idev = ifp->idev;
3904 struct net_device *dev = idev->dev;
3905 bool bump_id, notify = false;
3906 struct net *net;
3907
3908 addrconf_join_solict(dev, &ifp->addr);
3909
3910 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3911
3912 read_lock_bh(&idev->lock);
3913 spin_lock(&ifp->lock);
3914 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3915 goto out;
3916
3917 net = dev_net(dev);
3918 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3919 (net->ipv6.devconf_all->accept_dad < 1 &&
3920 idev->cnf.accept_dad < 1) ||
3921 !(ifp->flags&IFA_F_TENTATIVE) ||
3922 ifp->flags & IFA_F_NODAD) {
3923 bool send_na = false;
3924
3925 if (ifp->flags & IFA_F_TENTATIVE &&
3926 !(ifp->flags & IFA_F_OPTIMISTIC))
3927 send_na = true;
3928 bump_id = ifp->flags & IFA_F_TENTATIVE;
3929 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3930 spin_unlock(&ifp->lock);
3931 read_unlock_bh(&idev->lock);
3932
3933 addrconf_dad_completed(ifp, bump_id, send_na);
3934 return;
3935 }
3936
3937 if (!(idev->if_flags & IF_READY)) {
3938 spin_unlock(&ifp->lock);
3939 read_unlock_bh(&idev->lock);
3940
3941
3942
3943
3944
3945 in6_ifa_hold(ifp);
3946 addrconf_dad_stop(ifp, 0);
3947 return;
3948 }
3949
3950
3951
3952
3953
3954 if (ifp->flags & IFA_F_OPTIMISTIC) {
3955 ip6_ins_rt(net, ifp->rt);
3956 if (ipv6_use_optimistic_addr(net, idev)) {
3957
3958
3959
3960 notify = true;
3961 }
3962 }
3963
3964 addrconf_dad_kick(ifp);
3965out:
3966 spin_unlock(&ifp->lock);
3967 read_unlock_bh(&idev->lock);
3968 if (notify)
3969 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3970}
3971
3972static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3973{
3974 bool begin_dad = false;
3975
3976 spin_lock_bh(&ifp->lock);
3977 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3978 ifp->state = INET6_IFADDR_STATE_PREDAD;
3979 begin_dad = true;
3980 }
3981 spin_unlock_bh(&ifp->lock);
3982
3983 if (begin_dad)
3984 addrconf_mod_dad_work(ifp, 0);
3985}
3986
3987static void addrconf_dad_work(struct work_struct *w)
3988{
3989 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3990 struct inet6_ifaddr,
3991 dad_work);
3992 struct inet6_dev *idev = ifp->idev;
3993 bool bump_id, disable_ipv6 = false;
3994 struct in6_addr mcaddr;
3995
3996 enum {
3997 DAD_PROCESS,
3998 DAD_BEGIN,
3999 DAD_ABORT,
4000 } action = DAD_PROCESS;
4001
4002 rtnl_lock();
4003
4004 spin_lock_bh(&ifp->lock);
4005 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
4006 action = DAD_BEGIN;
4007 ifp->state = INET6_IFADDR_STATE_DAD;
4008 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
4009 action = DAD_ABORT;
4010 ifp->state = INET6_IFADDR_STATE_POSTDAD;
4011
4012 if ((dev_net(idev->dev)->ipv6.devconf_all->accept_dad > 1 ||
4013 idev->cnf.accept_dad > 1) &&
4014 !idev->cnf.disable_ipv6 &&
4015 !(ifp->flags & IFA_F_STABLE_PRIVACY)) {
4016 struct in6_addr addr;
4017
4018 addr.s6_addr32[0] = htonl(0xfe800000);
4019 addr.s6_addr32[1] = 0;
4020
4021 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
4022 ipv6_addr_equal(&ifp->addr, &addr)) {
4023
4024 idev->cnf.disable_ipv6 = 1;
4025
4026 pr_info("%s: IPv6 being disabled!\n",
4027 ifp->idev->dev->name);
4028 disable_ipv6 = true;
4029 }
4030 }
4031 }
4032 spin_unlock_bh(&ifp->lock);
4033
4034 if (action == DAD_BEGIN) {
4035 addrconf_dad_begin(ifp);
4036 goto out;
4037 } else if (action == DAD_ABORT) {
4038 in6_ifa_hold(ifp);
4039 addrconf_dad_stop(ifp, 1);
4040 if (disable_ipv6)
4041 addrconf_ifdown(idev->dev, 0);
4042 goto out;
4043 }
4044
4045 if (!ifp->dad_probes && addrconf_dad_end(ifp))
4046 goto out;
4047
4048 write_lock_bh(&idev->lock);
4049 if (idev->dead || !(idev->if_flags & IF_READY)) {
4050 write_unlock_bh(&idev->lock);
4051 goto out;
4052 }
4053
4054 spin_lock(&ifp->lock);
4055 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
4056 spin_unlock(&ifp->lock);
4057 write_unlock_bh(&idev->lock);
4058 goto out;
4059 }
4060
4061 if (ifp->dad_probes == 0) {
4062 bool send_na = false;
4063
4064
4065
4066
4067
4068 if (ifp->flags & IFA_F_TENTATIVE &&
4069 !(ifp->flags & IFA_F_OPTIMISTIC))
4070 send_na = true;
4071 bump_id = ifp->flags & IFA_F_TENTATIVE;
4072 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
4073 spin_unlock(&ifp->lock);
4074 write_unlock_bh(&idev->lock);
4075
4076 addrconf_dad_completed(ifp, bump_id, send_na);
4077
4078 goto out;
4079 }
4080
4081 ifp->dad_probes--;
4082 addrconf_mod_dad_work(ifp,
4083 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME),
4084 HZ/100));
4085 spin_unlock(&ifp->lock);
4086 write_unlock_bh(&idev->lock);
4087
4088
4089 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
4090 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any,
4091 ifp->dad_nonce);
4092out:
4093 in6_ifa_put(ifp);
4094 rtnl_unlock();
4095}
4096
4097
4098static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
4099{
4100 struct inet6_ifaddr *ifpiter;
4101 struct inet6_dev *idev = ifp->idev;
4102
4103 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
4104 if (ifpiter->scope > IFA_LINK)
4105 break;
4106 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
4107 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
4108 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
4109 IFA_F_PERMANENT)
4110 return false;
4111 }
4112 return true;
4113}
4114
4115static void addrconf_dad_completed(struct inet6_ifaddr *ifp, bool bump_id,
4116 bool send_na)
4117{
4118 struct net_device *dev = ifp->idev->dev;
4119 struct in6_addr lladdr;
4120 bool send_rs, send_mld;
4121
4122 addrconf_del_dad_work(ifp);
4123
4124
4125
4126
4127
4128 ipv6_ifa_notify(RTM_NEWADDR, ifp);
4129
4130
4131
4132
4133
4134 read_lock_bh(&ifp->idev->lock);
4135 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
4136 send_rs = send_mld &&
4137 ipv6_accept_ra(ifp->idev) &&
4138 ifp->idev->cnf.rtr_solicits != 0 &&
4139 (dev->flags&IFF_LOOPBACK) == 0;
4140 read_unlock_bh(&ifp->idev->lock);
4141
4142
4143
4144
4145 if (send_mld)
4146 ipv6_mc_dad_complete(ifp->idev);
4147
4148
4149 if (send_na &&
4150 (ifp->idev->cnf.ndisc_notify ||
4151 dev_net(dev)->ipv6.devconf_all->ndisc_notify)) {
4152 ndisc_send_na(dev, &in6addr_linklocal_allnodes, &ifp->addr,
4153 !!ifp->idev->cnf.forwarding,
4154 false, true,
4155 true);
4156 }
4157
4158 if (send_rs) {
4159
4160
4161
4162
4163
4164 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
4165 return;
4166 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
4167
4168 write_lock_bh(&ifp->idev->lock);
4169 spin_lock(&ifp->lock);
4170 ifp->idev->rs_interval = rfc3315_s14_backoff_init(
4171 ifp->idev->cnf.rtr_solicit_interval);
4172 ifp->idev->rs_probes = 1;
4173 ifp->idev->if_flags |= IF_RS_SENT;
4174 addrconf_mod_rs_timer(ifp->idev, ifp->idev->rs_interval);
4175 spin_unlock(&ifp->lock);
4176 write_unlock_bh(&ifp->idev->lock);
4177 }
4178
4179 if (bump_id)
4180 rt_genid_bump_ipv6(dev_net(dev));
4181
4182
4183
4184
4185 if (ifp->flags & IFA_F_TEMPORARY)
4186 addrconf_verify_rtnl();
4187}
4188
4189static void addrconf_dad_run(struct inet6_dev *idev, bool restart)
4190{
4191 struct inet6_ifaddr *ifp;
4192
4193 read_lock_bh(&idev->lock);
4194 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4195 spin_lock(&ifp->lock);
4196 if ((ifp->flags & IFA_F_TENTATIVE &&
4197 ifp->state == INET6_IFADDR_STATE_DAD) || restart) {
4198 if (restart)
4199 ifp->state = INET6_IFADDR_STATE_PREDAD;
4200 addrconf_dad_kick(ifp);
4201 }
4202 spin_unlock(&ifp->lock);
4203 }
4204 read_unlock_bh(&idev->lock);
4205}
4206
4207#ifdef CONFIG_PROC_FS
4208struct if6_iter_state {
4209 struct seq_net_private p;
4210 int bucket;
4211 int offset;
4212};
4213
4214static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
4215{
4216 struct if6_iter_state *state = seq->private;
4217 struct net *net = seq_file_net(seq);
4218 struct inet6_ifaddr *ifa = NULL;
4219 int p = 0;
4220
4221
4222 if (pos == 0) {
4223 state->bucket = 0;
4224 state->offset = 0;
4225 }
4226
4227 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
4228 hlist_for_each_entry_rcu(ifa, &inet6_addr_lst[state->bucket],
4229 addr_lst) {
4230 if (!net_eq(dev_net(ifa->idev->dev), net))
4231 continue;
4232
4233 if (p < state->offset) {
4234 p++;
4235 continue;
4236 }
4237 return ifa;
4238 }
4239
4240
4241 state->offset = 0;
4242 p = 0;
4243 }
4244 return NULL;
4245}
4246
4247static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
4248 struct inet6_ifaddr *ifa)
4249{
4250 struct if6_iter_state *state = seq->private;
4251 struct net *net = seq_file_net(seq);
4252
4253 hlist_for_each_entry_continue_rcu(ifa, addr_lst) {
4254 if (!net_eq(dev_net(ifa->idev->dev), net))
4255 continue;
4256 state->offset++;
4257 return ifa;
4258 }
4259
4260 state->offset = 0;
4261 while (++state->bucket < IN6_ADDR_HSIZE) {
4262 hlist_for_each_entry_rcu(ifa,
4263 &inet6_addr_lst[state->bucket], addr_lst) {
4264 if (!net_eq(dev_net(ifa->idev->dev), net))
4265 continue;
4266 return ifa;
4267 }
4268 }
4269
4270 return NULL;
4271}
4272
4273static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
4274 __acquires(rcu)
4275{
4276 rcu_read_lock();
4277 return if6_get_first(seq, *pos);
4278}
4279
4280static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4281{
4282 struct inet6_ifaddr *ifa;
4283
4284 ifa = if6_get_next(seq, v);
4285 ++*pos;
4286 return ifa;
4287}
4288
4289static void if6_seq_stop(struct seq_file *seq, void *v)
4290 __releases(rcu)
4291{
4292 rcu_read_unlock();
4293}
4294
4295static int if6_seq_show(struct seq_file *seq, void *v)
4296{
4297 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
4298 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
4299 &ifp->addr,
4300 ifp->idev->dev->ifindex,
4301 ifp->prefix_len,
4302 ifp->scope,
4303 (u8) ifp->flags,
4304 ifp->idev->dev->name);
4305 return 0;
4306}
4307
4308static const struct seq_operations if6_seq_ops = {
4309 .start = if6_seq_start,
4310 .next = if6_seq_next,
4311 .show = if6_seq_show,
4312 .stop = if6_seq_stop,
4313};
4314
4315static int __net_init if6_proc_net_init(struct net *net)
4316{
4317 if (!proc_create_net("if_inet6", 0444, net->proc_net, &if6_seq_ops,
4318 sizeof(struct if6_iter_state)))
4319 return -ENOMEM;
4320 return 0;
4321}
4322
4323static void __net_exit if6_proc_net_exit(struct net *net)
4324{
4325 remove_proc_entry("if_inet6", net->proc_net);
4326}
4327
4328static struct pernet_operations if6_proc_net_ops = {
4329 .init = if6_proc_net_init,
4330 .exit = if6_proc_net_exit,
4331};
4332
4333int __init if6_proc_init(void)
4334{
4335 return register_pernet_subsys(&if6_proc_net_ops);
4336}
4337
4338void if6_proc_exit(void)
4339{
4340 unregister_pernet_subsys(&if6_proc_net_ops);
4341}
4342#endif
4343
4344#if IS_ENABLED(CONFIG_IPV6_MIP6)
4345
4346int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
4347{
4348 unsigned int hash = inet6_addr_hash(net, addr);
4349 struct inet6_ifaddr *ifp = NULL;
4350 int ret = 0;
4351
4352 rcu_read_lock();
4353 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4354 if (!net_eq(dev_net(ifp->idev->dev), net))
4355 continue;
4356 if (ipv6_addr_equal(&ifp->addr, addr) &&
4357 (ifp->flags & IFA_F_HOMEADDRESS)) {
4358 ret = 1;
4359 break;
4360 }
4361 }
4362 rcu_read_unlock();
4363 return ret;
4364}
4365#endif
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377int ipv6_chk_rpl_srh_loop(struct net *net, const struct in6_addr *segs,
4378 unsigned char nsegs)
4379{
4380 const struct in6_addr *addr;
4381 int i, ret = 0, found = 0;
4382 struct inet6_ifaddr *ifp;
4383 bool separated = false;
4384 unsigned int hash;
4385 bool hash_found;
4386
4387 rcu_read_lock();
4388 for (i = 0; i < nsegs; i++) {
4389 addr = &segs[i];
4390 hash = inet6_addr_hash(net, addr);
4391
4392 hash_found = false;
4393 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
4394 if (!net_eq(dev_net(ifp->idev->dev), net))
4395 continue;
4396
4397 if (ipv6_addr_equal(&ifp->addr, addr)) {
4398 hash_found = true;
4399 break;
4400 }
4401 }
4402
4403 if (hash_found) {
4404 if (found > 1 && separated) {
4405 ret = 1;
4406 break;
4407 }
4408
4409 separated = false;
4410 found++;
4411 } else {
4412 separated = true;
4413 }
4414 }
4415 rcu_read_unlock();
4416
4417 return ret;
4418}
4419
4420
4421
4422
4423
4424static void addrconf_verify_rtnl(void)
4425{
4426 unsigned long now, next, next_sec, next_sched;
4427 struct inet6_ifaddr *ifp;
4428 int i;
4429
4430 ASSERT_RTNL();
4431
4432 rcu_read_lock_bh();
4433 now = jiffies;
4434 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
4435
4436 cancel_delayed_work(&addr_chk_work);
4437
4438 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
4439restart:
4440 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
4441 unsigned long age;
4442
4443
4444
4445
4446
4447 if ((ifp->flags & IFA_F_PERMANENT) &&
4448 (ifp->prefered_lft == INFINITY_LIFE_TIME))
4449 continue;
4450
4451 spin_lock(&ifp->lock);
4452
4453 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
4454
4455 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
4456 age >= ifp->valid_lft) {
4457 spin_unlock(&ifp->lock);
4458 in6_ifa_hold(ifp);
4459 ipv6_del_addr(ifp);
4460 goto restart;
4461 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
4462 spin_unlock(&ifp->lock);
4463 continue;
4464 } else if (age >= ifp->prefered_lft) {
4465
4466 int deprecate = 0;
4467
4468 if (!(ifp->flags&IFA_F_DEPRECATED)) {
4469 deprecate = 1;
4470 ifp->flags |= IFA_F_DEPRECATED;
4471 }
4472
4473 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
4474 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
4475 next = ifp->tstamp + ifp->valid_lft * HZ;
4476
4477 spin_unlock(&ifp->lock);
4478
4479 if (deprecate) {
4480 in6_ifa_hold(ifp);
4481
4482 ipv6_ifa_notify(0, ifp);
4483 in6_ifa_put(ifp);
4484 goto restart;
4485 }
4486 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
4487 !(ifp->flags&IFA_F_TENTATIVE)) {
4488 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
4489 ifp->idev->cnf.dad_transmits *
4490 max(NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME), HZ/100) / HZ;
4491
4492 if (age >= ifp->prefered_lft - regen_advance) {
4493 struct inet6_ifaddr *ifpub = ifp->ifpub;
4494 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4495 next = ifp->tstamp + ifp->prefered_lft * HZ;
4496 if (!ifp->regen_count && ifpub) {
4497 ifp->regen_count++;
4498 in6_ifa_hold(ifp);
4499 in6_ifa_hold(ifpub);
4500 spin_unlock(&ifp->lock);
4501
4502 spin_lock(&ifpub->lock);
4503 ifpub->regen_count = 0;
4504 spin_unlock(&ifpub->lock);
4505 rcu_read_unlock_bh();
4506 ipv6_create_tempaddr(ifpub, true);
4507 in6_ifa_put(ifpub);
4508 in6_ifa_put(ifp);
4509 rcu_read_lock_bh();
4510 goto restart;
4511 }
4512 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4513 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4514 spin_unlock(&ifp->lock);
4515 } else {
4516
4517 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4518 next = ifp->tstamp + ifp->prefered_lft * HZ;
4519 spin_unlock(&ifp->lock);
4520 }
4521 }
4522 }
4523
4524 next_sec = round_jiffies_up(next);
4525 next_sched = next;
4526
4527
4528 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4529 next_sched = next_sec;
4530
4531
4532 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4533 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4534
4535 pr_debug("now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4536 now, next, next_sec, next_sched);
4537 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4538 rcu_read_unlock_bh();
4539}
4540
4541static void addrconf_verify_work(struct work_struct *w)
4542{
4543 rtnl_lock();
4544 addrconf_verify_rtnl();
4545 rtnl_unlock();
4546}
4547
4548static void addrconf_verify(void)
4549{
4550 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4551}
4552
4553static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4554 struct in6_addr **peer_pfx)
4555{
4556 struct in6_addr *pfx = NULL;
4557
4558 *peer_pfx = NULL;
4559
4560 if (addr)
4561 pfx = nla_data(addr);
4562
4563 if (local) {
4564 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4565 *peer_pfx = pfx;
4566 pfx = nla_data(local);
4567 }
4568
4569 return pfx;
4570}
4571
4572static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4573 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4574 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4575 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4576 [IFA_FLAGS] = { .len = sizeof(u32) },
4577 [IFA_RT_PRIORITY] = { .len = sizeof(u32) },
4578 [IFA_TARGET_NETNSID] = { .type = NLA_S32 },
4579};
4580
4581static int
4582inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh,
4583 struct netlink_ext_ack *extack)
4584{
4585 struct net *net = sock_net(skb->sk);
4586 struct ifaddrmsg *ifm;
4587 struct nlattr *tb[IFA_MAX+1];
4588 struct in6_addr *pfx, *peer_pfx;
4589 u32 ifa_flags;
4590 int err;
4591
4592 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4593 ifa_ipv6_policy, extack);
4594 if (err < 0)
4595 return err;
4596
4597 ifm = nlmsg_data(nlh);
4598 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4599 if (!pfx)
4600 return -EINVAL;
4601
4602 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4603
4604
4605 ifa_flags &= IFA_F_MANAGETEMPADDR;
4606
4607 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4608 ifm->ifa_prefixlen);
4609}
4610
4611static int modify_prefix_route(struct inet6_ifaddr *ifp,
4612 unsigned long expires, u32 flags,
4613 bool modify_peer)
4614{
4615 struct fib6_info *f6i;
4616 u32 prio;
4617
4618 f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4619 ifp->prefix_len,
4620 ifp->idev->dev, 0, RTF_DEFAULT, true);
4621 if (!f6i)
4622 return -ENOENT;
4623
4624 prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
4625 if (f6i->fib6_metric != prio) {
4626
4627 ip6_del_rt(dev_net(ifp->idev->dev), f6i, false);
4628
4629
4630 addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr,
4631 ifp->prefix_len,
4632 ifp->rt_priority, ifp->idev->dev,
4633 expires, flags, GFP_KERNEL);
4634 } else {
4635 if (!expires)
4636 fib6_clean_expires(f6i);
4637 else
4638 fib6_set_expires(f6i, expires);
4639
4640 fib6_info_release(f6i);
4641 }
4642
4643 return 0;
4644}
4645
4646static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg)
4647{
4648 u32 flags;
4649 clock_t expires;
4650 unsigned long timeout;
4651 bool was_managetempaddr;
4652 bool had_prefixroute;
4653 bool new_peer = false;
4654
4655 ASSERT_RTNL();
4656
4657 if (!cfg->valid_lft || cfg->preferred_lft > cfg->valid_lft)
4658 return -EINVAL;
4659
4660 if (cfg->ifa_flags & IFA_F_MANAGETEMPADDR &&
4661 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4662 return -EINVAL;
4663
4664 if (!(ifp->flags & IFA_F_TENTATIVE) || ifp->flags & IFA_F_DADFAILED)
4665 cfg->ifa_flags &= ~IFA_F_OPTIMISTIC;
4666
4667 timeout = addrconf_timeout_fixup(cfg->valid_lft, HZ);
4668 if (addrconf_finite_timeout(timeout)) {
4669 expires = jiffies_to_clock_t(timeout * HZ);
4670 cfg->valid_lft = timeout;
4671 flags = RTF_EXPIRES;
4672 } else {
4673 expires = 0;
4674 flags = 0;
4675 cfg->ifa_flags |= IFA_F_PERMANENT;
4676 }
4677
4678 timeout = addrconf_timeout_fixup(cfg->preferred_lft, HZ);
4679 if (addrconf_finite_timeout(timeout)) {
4680 if (timeout == 0)
4681 cfg->ifa_flags |= IFA_F_DEPRECATED;
4682 cfg->preferred_lft = timeout;
4683 }
4684
4685 if (cfg->peer_pfx &&
4686 memcmp(&ifp->peer_addr, cfg->peer_pfx, sizeof(struct in6_addr))) {
4687 if (!ipv6_addr_any(&ifp->peer_addr))
4688 cleanup_prefix_route(ifp, expires, true, true);
4689 new_peer = true;
4690 }
4691
4692 spin_lock_bh(&ifp->lock);
4693 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4694 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4695 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4696 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4697 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4698 IFA_F_NOPREFIXROUTE);
4699 ifp->flags |= cfg->ifa_flags;
4700 ifp->tstamp = jiffies;
4701 ifp->valid_lft = cfg->valid_lft;
4702 ifp->prefered_lft = cfg->preferred_lft;
4703
4704 if (cfg->rt_priority && cfg->rt_priority != ifp->rt_priority)
4705 ifp->rt_priority = cfg->rt_priority;
4706
4707 if (new_peer)
4708 ifp->peer_addr = *cfg->peer_pfx;
4709
4710 spin_unlock_bh(&ifp->lock);
4711 if (!(ifp->flags&IFA_F_TENTATIVE))
4712 ipv6_ifa_notify(0, ifp);
4713
4714 if (!(cfg->ifa_flags & IFA_F_NOPREFIXROUTE)) {
4715 int rc = -ENOENT;
4716
4717 if (had_prefixroute)
4718 rc = modify_prefix_route(ifp, expires, flags, false);
4719
4720
4721 if (rc == -ENOENT) {
4722 addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
4723 ifp->rt_priority, ifp->idev->dev,
4724 expires, flags, GFP_KERNEL);
4725 }
4726
4727 if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr))
4728 rc = modify_prefix_route(ifp, expires, flags, true);
4729
4730 if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) {
4731 addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len,
4732 ifp->rt_priority, ifp->idev->dev,
4733 expires, flags, GFP_KERNEL);
4734 }
4735 } else if (had_prefixroute) {
4736 enum cleanup_prefix_rt_t action;
4737 unsigned long rt_expires;
4738
4739 write_lock_bh(&ifp->idev->lock);
4740 action = check_cleanup_prefix_route(ifp, &rt_expires);
4741 write_unlock_bh(&ifp->idev->lock);
4742
4743 if (action != CLEANUP_PREFIX_RT_NOP) {
4744 cleanup_prefix_route(ifp, rt_expires,
4745 action == CLEANUP_PREFIX_RT_DEL, false);
4746 }
4747 }
4748
4749 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4750 if (was_managetempaddr &&
4751 !(ifp->flags & IFA_F_MANAGETEMPADDR)) {
4752 cfg->valid_lft = 0;
4753 cfg->preferred_lft = 0;
4754 }
4755 manage_tempaddrs(ifp->idev, ifp, cfg->valid_lft,
4756 cfg->preferred_lft, !was_managetempaddr,
4757 jiffies);
4758 }
4759
4760 addrconf_verify_rtnl();
4761
4762 return 0;
4763}
4764
4765static int
4766inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh,
4767 struct netlink_ext_ack *extack)
4768{
4769 struct net *net = sock_net(skb->sk);
4770 struct ifaddrmsg *ifm;
4771 struct nlattr *tb[IFA_MAX+1];
4772 struct in6_addr *peer_pfx;
4773 struct inet6_ifaddr *ifa;
4774 struct net_device *dev;
4775 struct inet6_dev *idev;
4776 struct ifa6_config cfg;
4777 int err;
4778
4779 err = nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
4780 ifa_ipv6_policy, extack);
4781 if (err < 0)
4782 return err;
4783
4784 memset(&cfg, 0, sizeof(cfg));
4785
4786 ifm = nlmsg_data(nlh);
4787 cfg.pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4788 if (!cfg.pfx)
4789 return -EINVAL;
4790
4791 cfg.peer_pfx = peer_pfx;
4792 cfg.plen = ifm->ifa_prefixlen;
4793 if (tb[IFA_RT_PRIORITY])
4794 cfg.rt_priority = nla_get_u32(tb[IFA_RT_PRIORITY]);
4795
4796 cfg.valid_lft = INFINITY_LIFE_TIME;
4797 cfg.preferred_lft = INFINITY_LIFE_TIME;
4798
4799 if (tb[IFA_CACHEINFO]) {
4800 struct ifa_cacheinfo *ci;
4801
4802 ci = nla_data(tb[IFA_CACHEINFO]);
4803 cfg.valid_lft = ci->ifa_valid;
4804 cfg.preferred_lft = ci->ifa_prefered;
4805 }
4806
4807 dev = __dev_get_by_index(net, ifm->ifa_index);
4808 if (!dev)
4809 return -ENODEV;
4810
4811 if (tb[IFA_FLAGS])
4812 cfg.ifa_flags = nla_get_u32(tb[IFA_FLAGS]);
4813 else
4814 cfg.ifa_flags = ifm->ifa_flags;
4815
4816
4817 cfg.ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS |
4818 IFA_F_MANAGETEMPADDR | IFA_F_NOPREFIXROUTE |
4819 IFA_F_MCAUTOJOIN | IFA_F_OPTIMISTIC;
4820
4821 idev = ipv6_find_idev(dev);
4822 if (IS_ERR(idev))
4823 return PTR_ERR(idev);
4824
4825 if (!ipv6_allow_optimistic_dad(net, idev))
4826 cfg.ifa_flags &= ~IFA_F_OPTIMISTIC;
4827
4828 if (cfg.ifa_flags & IFA_F_NODAD &&
4829 cfg.ifa_flags & IFA_F_OPTIMISTIC) {
4830 NL_SET_ERR_MSG(extack, "IFA_F_NODAD and IFA_F_OPTIMISTIC are mutually exclusive");
4831 return -EINVAL;
4832 }
4833
4834 ifa = ipv6_get_ifaddr(net, cfg.pfx, dev, 1);
4835 if (!ifa) {
4836
4837
4838
4839
4840 return inet6_addr_add(net, ifm->ifa_index, &cfg, extack);
4841 }
4842
4843 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4844 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4845 err = -EEXIST;
4846 else
4847 err = inet6_addr_modify(ifa, &cfg);
4848
4849 in6_ifa_put(ifa);
4850
4851 return err;
4852}
4853
4854static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4855 u8 scope, int ifindex)
4856{
4857 struct ifaddrmsg *ifm;
4858
4859 ifm = nlmsg_data(nlh);
4860 ifm->ifa_family = AF_INET6;
4861 ifm->ifa_prefixlen = prefixlen;
4862 ifm->ifa_flags = flags;
4863 ifm->ifa_scope = scope;
4864 ifm->ifa_index = ifindex;
4865}
4866
4867static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4868 unsigned long tstamp, u32 preferred, u32 valid)
4869{
4870 struct ifa_cacheinfo ci;
4871
4872 ci.cstamp = cstamp_delta(cstamp);
4873 ci.tstamp = cstamp_delta(tstamp);
4874 ci.ifa_prefered = preferred;
4875 ci.ifa_valid = valid;
4876
4877 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4878}
4879
4880static inline int rt_scope(int ifa_scope)
4881{
4882 if (ifa_scope & IFA_HOST)
4883 return RT_SCOPE_HOST;
4884 else if (ifa_scope & IFA_LINK)
4885 return RT_SCOPE_LINK;
4886 else if (ifa_scope & IFA_SITE)
4887 return RT_SCOPE_SITE;
4888 else
4889 return RT_SCOPE_UNIVERSE;
4890}
4891
4892static inline int inet6_ifaddr_msgsize(void)
4893{
4894 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4895 + nla_total_size(16)
4896 + nla_total_size(16)
4897 + nla_total_size(sizeof(struct ifa_cacheinfo))
4898 + nla_total_size(4)
4899 + nla_total_size(4) ;
4900}
4901
4902enum addr_type_t {
4903 UNICAST_ADDR,
4904 MULTICAST_ADDR,
4905 ANYCAST_ADDR,
4906};
4907
4908struct inet6_fill_args {
4909 u32 portid;
4910 u32 seq;
4911 int event;
4912 unsigned int flags;
4913 int netnsid;
4914 int ifindex;
4915 enum addr_type_t type;
4916};
4917
4918static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4919 struct inet6_fill_args *args)
4920{
4921 struct nlmsghdr *nlh;
4922 u32 preferred, valid;
4923
4924 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4925 sizeof(struct ifaddrmsg), args->flags);
4926 if (!nlh)
4927 return -EMSGSIZE;
4928
4929 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4930 ifa->idev->dev->ifindex);
4931
4932 if (args->netnsid >= 0 &&
4933 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
4934 goto error;
4935
4936 if (!((ifa->flags&IFA_F_PERMANENT) &&
4937 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4938 preferred = ifa->prefered_lft;
4939 valid = ifa->valid_lft;
4940 if (preferred != INFINITY_LIFE_TIME) {
4941 long tval = (jiffies - ifa->tstamp)/HZ;
4942 if (preferred > tval)
4943 preferred -= tval;
4944 else
4945 preferred = 0;
4946 if (valid != INFINITY_LIFE_TIME) {
4947 if (valid > tval)
4948 valid -= tval;
4949 else
4950 valid = 0;
4951 }
4952 }
4953 } else {
4954 preferred = INFINITY_LIFE_TIME;
4955 valid = INFINITY_LIFE_TIME;
4956 }
4957
4958 if (!ipv6_addr_any(&ifa->peer_addr)) {
4959 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4960 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4961 goto error;
4962 } else
4963 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4964 goto error;
4965
4966 if (ifa->rt_priority &&
4967 nla_put_u32(skb, IFA_RT_PRIORITY, ifa->rt_priority))
4968 goto error;
4969
4970 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4971 goto error;
4972
4973 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4974 goto error;
4975
4976 nlmsg_end(skb, nlh);
4977 return 0;
4978
4979error:
4980 nlmsg_cancel(skb, nlh);
4981 return -EMSGSIZE;
4982}
4983
4984static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4985 struct inet6_fill_args *args)
4986{
4987 struct nlmsghdr *nlh;
4988 u8 scope = RT_SCOPE_UNIVERSE;
4989 int ifindex = ifmca->idev->dev->ifindex;
4990
4991 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4992 scope = RT_SCOPE_SITE;
4993
4994 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
4995 sizeof(struct ifaddrmsg), args->flags);
4996 if (!nlh)
4997 return -EMSGSIZE;
4998
4999 if (args->netnsid >= 0 &&
5000 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5001 return -EMSGSIZE;
5002
5003 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5004 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
5005 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
5006 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5007 nlmsg_cancel(skb, nlh);
5008 return -EMSGSIZE;
5009 }
5010
5011 nlmsg_end(skb, nlh);
5012 return 0;
5013}
5014
5015static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
5016 struct inet6_fill_args *args)
5017{
5018 struct net_device *dev = fib6_info_nh_dev(ifaca->aca_rt);
5019 int ifindex = dev ? dev->ifindex : 1;
5020 struct nlmsghdr *nlh;
5021 u8 scope = RT_SCOPE_UNIVERSE;
5022
5023 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
5024 scope = RT_SCOPE_SITE;
5025
5026 nlh = nlmsg_put(skb, args->portid, args->seq, args->event,
5027 sizeof(struct ifaddrmsg), args->flags);
5028 if (!nlh)
5029 return -EMSGSIZE;
5030
5031 if (args->netnsid >= 0 &&
5032 nla_put_s32(skb, IFA_TARGET_NETNSID, args->netnsid))
5033 return -EMSGSIZE;
5034
5035 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
5036 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
5037 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
5038 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
5039 nlmsg_cancel(skb, nlh);
5040 return -EMSGSIZE;
5041 }
5042
5043 nlmsg_end(skb, nlh);
5044 return 0;
5045}
5046
5047
5048static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
5049 struct netlink_callback *cb, int s_ip_idx,
5050 struct inet6_fill_args *fillargs)
5051{
5052 struct ifmcaddr6 *ifmca;
5053 struct ifacaddr6 *ifaca;
5054 int ip_idx = 0;
5055 int err = 1;
5056
5057 read_lock_bh(&idev->lock);
5058 switch (fillargs->type) {
5059 case UNICAST_ADDR: {
5060 struct inet6_ifaddr *ifa;
5061 fillargs->event = RTM_NEWADDR;
5062
5063
5064 list_for_each_entry(ifa, &idev->addr_list, if_list) {
5065 if (ip_idx < s_ip_idx)
5066 goto next;
5067 err = inet6_fill_ifaddr(skb, ifa, fillargs);
5068 if (err < 0)
5069 break;
5070 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
5071next:
5072 ip_idx++;
5073 }
5074 break;
5075 }
5076 case MULTICAST_ADDR:
5077 fillargs->event = RTM_GETMULTICAST;
5078
5079
5080 for (ifmca = idev->mc_list; ifmca;
5081 ifmca = ifmca->next, ip_idx++) {
5082 if (ip_idx < s_ip_idx)
5083 continue;
5084 err = inet6_fill_ifmcaddr(skb, ifmca, fillargs);
5085 if (err < 0)
5086 break;
5087 }
5088 break;
5089 case ANYCAST_ADDR:
5090 fillargs->event = RTM_GETANYCAST;
5091
5092 for (ifaca = idev->ac_list; ifaca;
5093 ifaca = ifaca->aca_next, ip_idx++) {
5094 if (ip_idx < s_ip_idx)
5095 continue;
5096 err = inet6_fill_ifacaddr(skb, ifaca, fillargs);
5097 if (err < 0)
5098 break;
5099 }
5100 break;
5101 default:
5102 break;
5103 }
5104 read_unlock_bh(&idev->lock);
5105 cb->args[2] = ip_idx;
5106 return err;
5107}
5108
5109static int inet6_valid_dump_ifaddr_req(const struct nlmsghdr *nlh,
5110 struct inet6_fill_args *fillargs,
5111 struct net **tgt_net, struct sock *sk,
5112 struct netlink_callback *cb)
5113{
5114 struct netlink_ext_ack *extack = cb->extack;
5115 struct nlattr *tb[IFA_MAX+1];
5116 struct ifaddrmsg *ifm;
5117 int err, i;
5118
5119 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5120 NL_SET_ERR_MSG_MOD(extack, "Invalid header for address dump request");
5121 return -EINVAL;
5122 }
5123
5124 ifm = nlmsg_data(nlh);
5125 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5126 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address dump request");
5127 return -EINVAL;
5128 }
5129
5130 fillargs->ifindex = ifm->ifa_index;
5131 if (fillargs->ifindex) {
5132 cb->answer_flags |= NLM_F_DUMP_FILTERED;
5133 fillargs->flags |= NLM_F_DUMP_FILTERED;
5134 }
5135
5136 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5137 ifa_ipv6_policy, extack);
5138 if (err < 0)
5139 return err;
5140
5141 for (i = 0; i <= IFA_MAX; ++i) {
5142 if (!tb[i])
5143 continue;
5144
5145 if (i == IFA_TARGET_NETNSID) {
5146 struct net *net;
5147
5148 fillargs->netnsid = nla_get_s32(tb[i]);
5149 net = rtnl_get_net_ns_capable(sk, fillargs->netnsid);
5150 if (IS_ERR(net)) {
5151 fillargs->netnsid = -1;
5152 NL_SET_ERR_MSG_MOD(extack, "Invalid target network namespace id");
5153 return PTR_ERR(net);
5154 }
5155 *tgt_net = net;
5156 } else {
5157 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in dump request");
5158 return -EINVAL;
5159 }
5160 }
5161
5162 return 0;
5163}
5164
5165static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
5166 enum addr_type_t type)
5167{
5168 const struct nlmsghdr *nlh = cb->nlh;
5169 struct inet6_fill_args fillargs = {
5170 .portid = NETLINK_CB(cb->skb).portid,
5171 .seq = cb->nlh->nlmsg_seq,
5172 .flags = NLM_F_MULTI,
5173 .netnsid = -1,
5174 .type = type,
5175 };
5176 struct net *net = sock_net(skb->sk);
5177 struct net *tgt_net = net;
5178 int idx, s_idx, s_ip_idx;
5179 int h, s_h;
5180 struct net_device *dev;
5181 struct inet6_dev *idev;
5182 struct hlist_head *head;
5183 int err = 0;
5184
5185 s_h = cb->args[0];
5186 s_idx = idx = cb->args[1];
5187 s_ip_idx = cb->args[2];
5188
5189 if (cb->strict_check) {
5190 err = inet6_valid_dump_ifaddr_req(nlh, &fillargs, &tgt_net,
5191 skb->sk, cb);
5192 if (err < 0)
5193 goto put_tgt_net;
5194
5195 err = 0;
5196 if (fillargs.ifindex) {
5197 dev = __dev_get_by_index(tgt_net, fillargs.ifindex);
5198 if (!dev) {
5199 err = -ENODEV;
5200 goto put_tgt_net;
5201 }
5202 idev = __in6_dev_get(dev);
5203 if (idev) {
5204 err = in6_dump_addrs(idev, skb, cb, s_ip_idx,
5205 &fillargs);
5206 if (err > 0)
5207 err = 0;
5208 }
5209 goto put_tgt_net;
5210 }
5211 }
5212
5213 rcu_read_lock();
5214 cb->seq = atomic_read(&tgt_net->ipv6.dev_addr_genid) ^ tgt_net->dev_base_seq;
5215 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5216 idx = 0;
5217 head = &tgt_net->dev_index_head[h];
5218 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5219 if (idx < s_idx)
5220 goto cont;
5221 if (h > s_h || idx > s_idx)
5222 s_ip_idx = 0;
5223 idev = __in6_dev_get(dev);
5224 if (!idev)
5225 goto cont;
5226
5227 if (in6_dump_addrs(idev, skb, cb, s_ip_idx,
5228 &fillargs) < 0)
5229 goto done;
5230cont:
5231 idx++;
5232 }
5233 }
5234done:
5235 rcu_read_unlock();
5236 cb->args[0] = h;
5237 cb->args[1] = idx;
5238put_tgt_net:
5239 if (fillargs.netnsid >= 0)
5240 put_net(tgt_net);
5241
5242 return skb->len ? : err;
5243}
5244
5245static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
5246{
5247 enum addr_type_t type = UNICAST_ADDR;
5248
5249 return inet6_dump_addr(skb, cb, type);
5250}
5251
5252static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
5253{
5254 enum addr_type_t type = MULTICAST_ADDR;
5255
5256 return inet6_dump_addr(skb, cb, type);
5257}
5258
5259
5260static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
5261{
5262 enum addr_type_t type = ANYCAST_ADDR;
5263
5264 return inet6_dump_addr(skb, cb, type);
5265}
5266
5267static int inet6_rtm_valid_getaddr_req(struct sk_buff *skb,
5268 const struct nlmsghdr *nlh,
5269 struct nlattr **tb,
5270 struct netlink_ext_ack *extack)
5271{
5272 struct ifaddrmsg *ifm;
5273 int i, err;
5274
5275 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5276 NL_SET_ERR_MSG_MOD(extack, "Invalid header for get address request");
5277 return -EINVAL;
5278 }
5279
5280 if (!netlink_strict_get_check(skb))
5281 return nlmsg_parse_deprecated(nlh, sizeof(*ifm), tb, IFA_MAX,
5282 ifa_ipv6_policy, extack);
5283
5284 ifm = nlmsg_data(nlh);
5285 if (ifm->ifa_prefixlen || ifm->ifa_flags || ifm->ifa_scope) {
5286 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for get address request");
5287 return -EINVAL;
5288 }
5289
5290 err = nlmsg_parse_deprecated_strict(nlh, sizeof(*ifm), tb, IFA_MAX,
5291 ifa_ipv6_policy, extack);
5292 if (err)
5293 return err;
5294
5295 for (i = 0; i <= IFA_MAX; i++) {
5296 if (!tb[i])
5297 continue;
5298
5299 switch (i) {
5300 case IFA_TARGET_NETNSID:
5301 case IFA_ADDRESS:
5302 case IFA_LOCAL:
5303 break;
5304 default:
5305 NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in get address request");
5306 return -EINVAL;
5307 }
5308 }
5309
5310 return 0;
5311}
5312
5313static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh,
5314 struct netlink_ext_ack *extack)
5315{
5316 struct net *net = sock_net(in_skb->sk);
5317 struct inet6_fill_args fillargs = {
5318 .portid = NETLINK_CB(in_skb).portid,
5319 .seq = nlh->nlmsg_seq,
5320 .event = RTM_NEWADDR,
5321 .flags = 0,
5322 .netnsid = -1,
5323 };
5324 struct net *tgt_net = net;
5325 struct ifaddrmsg *ifm;
5326 struct nlattr *tb[IFA_MAX+1];
5327 struct in6_addr *addr = NULL, *peer;
5328 struct net_device *dev = NULL;
5329 struct inet6_ifaddr *ifa;
5330 struct sk_buff *skb;
5331 int err;
5332
5333 err = inet6_rtm_valid_getaddr_req(in_skb, nlh, tb, extack);
5334 if (err < 0)
5335 return err;
5336
5337 if (tb[IFA_TARGET_NETNSID]) {
5338 fillargs.netnsid = nla_get_s32(tb[IFA_TARGET_NETNSID]);
5339
5340 tgt_net = rtnl_get_net_ns_capable(NETLINK_CB(in_skb).sk,
5341 fillargs.netnsid);
5342 if (IS_ERR(tgt_net))
5343 return PTR_ERR(tgt_net);
5344 }
5345
5346 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
5347 if (!addr)
5348 return -EINVAL;
5349
5350 ifm = nlmsg_data(nlh);
5351 if (ifm->ifa_index)
5352 dev = dev_get_by_index(tgt_net, ifm->ifa_index);
5353
5354 ifa = ipv6_get_ifaddr(tgt_net, addr, dev, 1);
5355 if (!ifa) {
5356 err = -EADDRNOTAVAIL;
5357 goto errout;
5358 }
5359
5360 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
5361 if (!skb) {
5362 err = -ENOBUFS;
5363 goto errout_ifa;
5364 }
5365
5366 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5367 if (err < 0) {
5368
5369 WARN_ON(err == -EMSGSIZE);
5370 kfree_skb(skb);
5371 goto errout_ifa;
5372 }
5373 err = rtnl_unicast(skb, tgt_net, NETLINK_CB(in_skb).portid);
5374errout_ifa:
5375 in6_ifa_put(ifa);
5376errout:
5377 if (dev)
5378 dev_put(dev);
5379 if (fillargs.netnsid >= 0)
5380 put_net(tgt_net);
5381
5382 return err;
5383}
5384
5385static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
5386{
5387 struct sk_buff *skb;
5388 struct net *net = dev_net(ifa->idev->dev);
5389 struct inet6_fill_args fillargs = {
5390 .portid = 0,
5391 .seq = 0,
5392 .event = event,
5393 .flags = 0,
5394 .netnsid = -1,
5395 };
5396 int err = -ENOBUFS;
5397
5398 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
5399 if (!skb)
5400 goto errout;
5401
5402 err = inet6_fill_ifaddr(skb, ifa, &fillargs);
5403 if (err < 0) {
5404
5405 WARN_ON(err == -EMSGSIZE);
5406 kfree_skb(skb);
5407 goto errout;
5408 }
5409 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
5410 return;
5411errout:
5412 if (err < 0)
5413 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
5414}
5415
5416static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
5417 __s32 *array, int bytes)
5418{
5419 BUG_ON(bytes < (DEVCONF_MAX * 4));
5420
5421 memset(array, 0, bytes);
5422 array[DEVCONF_FORWARDING] = cnf->forwarding;
5423 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
5424 array[DEVCONF_MTU6] = cnf->mtu6;
5425 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
5426 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
5427 array[DEVCONF_AUTOCONF] = cnf->autoconf;
5428 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
5429 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
5430 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
5431 jiffies_to_msecs(cnf->rtr_solicit_interval);
5432 array[DEVCONF_RTR_SOLICIT_MAX_INTERVAL] =
5433 jiffies_to_msecs(cnf->rtr_solicit_max_interval);
5434 array[DEVCONF_RTR_SOLICIT_DELAY] =
5435 jiffies_to_msecs(cnf->rtr_solicit_delay);
5436 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
5437 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
5438 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
5439 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
5440 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
5441 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
5442 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
5443 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
5444 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
5445 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
5446 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
5447 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
5448 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
5449 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
5450#ifdef CONFIG_IPV6_ROUTER_PREF
5451 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
5452 array[DEVCONF_RTR_PROBE_INTERVAL] =
5453 jiffies_to_msecs(cnf->rtr_probe_interval);
5454#ifdef CONFIG_IPV6_ROUTE_INFO
5455 array[DEVCONF_ACCEPT_RA_RT_INFO_MIN_PLEN] = cnf->accept_ra_rt_info_min_plen;
5456 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
5457#endif
5458#endif
5459 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
5460 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
5461#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5462 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
5463 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
5464#endif
5465#ifdef CONFIG_IPV6_MROUTE
5466 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
5467#endif
5468 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
5469 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
5470 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
5471 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
5472 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
5473 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
5474 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
5475 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
5476
5477 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
5478 array[DEVCONF_DROP_UNICAST_IN_L2_MULTICAST] = cnf->drop_unicast_in_l2_multicast;
5479 array[DEVCONF_DROP_UNSOLICITED_NA] = cnf->drop_unsolicited_na;
5480 array[DEVCONF_KEEP_ADDR_ON_DOWN] = cnf->keep_addr_on_down;
5481 array[DEVCONF_SEG6_ENABLED] = cnf->seg6_enabled;
5482#ifdef CONFIG_IPV6_SEG6_HMAC
5483 array[DEVCONF_SEG6_REQUIRE_HMAC] = cnf->seg6_require_hmac;
5484#endif
5485 array[DEVCONF_ENHANCED_DAD] = cnf->enhanced_dad;
5486 array[DEVCONF_ADDR_GEN_MODE] = cnf->addr_gen_mode;
5487 array[DEVCONF_DISABLE_POLICY] = cnf->disable_policy;
5488 array[DEVCONF_NDISC_TCLASS] = cnf->ndisc_tclass;
5489 array[DEVCONF_RPL_SEG_ENABLED] = cnf->rpl_seg_enabled;
5490}
5491
5492static inline size_t inet6_ifla6_size(void)
5493{
5494 return nla_total_size(4)
5495 + nla_total_size(sizeof(struct ifla_cacheinfo))
5496 + nla_total_size(DEVCONF_MAX * 4)
5497 + nla_total_size(IPSTATS_MIB_MAX * 8)
5498 + nla_total_size(ICMP6_MIB_MAX * 8)
5499 + nla_total_size(sizeof(struct in6_addr))
5500 + nla_total_size(1)
5501 + 0;
5502}
5503
5504static inline size_t inet6_if_nlmsg_size(void)
5505{
5506 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
5507 + nla_total_size(IFNAMSIZ)
5508 + nla_total_size(MAX_ADDR_LEN)
5509 + nla_total_size(4)
5510 + nla_total_size(4)
5511 + nla_total_size(1)
5512 + nla_total_size(inet6_ifla6_size());
5513}
5514
5515static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
5516 int bytes)
5517{
5518 int i;
5519 int pad = bytes - sizeof(u64) * ICMP6_MIB_MAX;
5520 BUG_ON(pad < 0);
5521
5522
5523 put_unaligned(ICMP6_MIB_MAX, &stats[0]);
5524 for (i = 1; i < ICMP6_MIB_MAX; i++)
5525 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
5526
5527 memset(&stats[ICMP6_MIB_MAX], 0, pad);
5528}
5529
5530static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
5531 int bytes, size_t syncpoff)
5532{
5533 int i, c;
5534 u64 buff[IPSTATS_MIB_MAX];
5535 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
5536
5537 BUG_ON(pad < 0);
5538
5539 memset(buff, 0, sizeof(buff));
5540 buff[0] = IPSTATS_MIB_MAX;
5541
5542 for_each_possible_cpu(c) {
5543 for (i = 1; i < IPSTATS_MIB_MAX; i++)
5544 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
5545 }
5546
5547 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
5548 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
5549}
5550
5551static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
5552 int bytes)
5553{
5554 switch (attrtype) {
5555 case IFLA_INET6_STATS:
5556 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
5557 offsetof(struct ipstats_mib, syncp));
5558 break;
5559 case IFLA_INET6_ICMP6STATS:
5560 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, bytes);
5561 break;
5562 }
5563}
5564
5565static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
5566 u32 ext_filter_mask)
5567{
5568 struct nlattr *nla;
5569 struct ifla_cacheinfo ci;
5570
5571 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
5572 goto nla_put_failure;
5573 ci.max_reasm_len = IPV6_MAXPLEN;
5574 ci.tstamp = cstamp_delta(idev->tstamp);
5575 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
5576 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
5577 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
5578 goto nla_put_failure;
5579 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
5580 if (!nla)
5581 goto nla_put_failure;
5582 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
5583
5584
5585
5586 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
5587 return 0;
5588
5589 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
5590 if (!nla)
5591 goto nla_put_failure;
5592 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
5593
5594 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
5595 if (!nla)
5596 goto nla_put_failure;
5597 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
5598
5599 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
5600 if (!nla)
5601 goto nla_put_failure;
5602 read_lock_bh(&idev->lock);
5603 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
5604 read_unlock_bh(&idev->lock);
5605
5606 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->cnf.addr_gen_mode))
5607 goto nla_put_failure;
5608
5609 return 0;
5610
5611nla_put_failure:
5612 return -EMSGSIZE;
5613}
5614
5615static size_t inet6_get_link_af_size(const struct net_device *dev,
5616 u32 ext_filter_mask)
5617{
5618 if (!__in6_dev_get(dev))
5619 return 0;
5620
5621 return inet6_ifla6_size();
5622}
5623
5624static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
5625 u32 ext_filter_mask)
5626{
5627 struct inet6_dev *idev = __in6_dev_get(dev);
5628
5629 if (!idev)
5630 return -ENODATA;
5631
5632 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
5633 return -EMSGSIZE;
5634
5635 return 0;
5636}
5637
5638static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
5639{
5640 struct inet6_ifaddr *ifp;
5641 struct net_device *dev = idev->dev;
5642 bool clear_token, update_rs = false;
5643 struct in6_addr ll_addr;
5644
5645 ASSERT_RTNL();
5646
5647 if (!token)
5648 return -EINVAL;
5649 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
5650 return -EINVAL;
5651 if (!ipv6_accept_ra(idev))
5652 return -EINVAL;
5653 if (idev->cnf.rtr_solicits == 0)
5654 return -EINVAL;
5655
5656 write_lock_bh(&idev->lock);
5657
5658 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
5659 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
5660
5661 write_unlock_bh(&idev->lock);
5662
5663 clear_token = ipv6_addr_any(token);
5664 if (clear_token)
5665 goto update_lft;
5666
5667 if (!idev->dead && (idev->if_flags & IF_READY) &&
5668 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
5669 IFA_F_OPTIMISTIC)) {
5670
5671
5672
5673 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
5674 update_rs = true;
5675 }
5676
5677update_lft:
5678 write_lock_bh(&idev->lock);
5679
5680 if (update_rs) {
5681 idev->if_flags |= IF_RS_SENT;
5682 idev->rs_interval = rfc3315_s14_backoff_init(
5683 idev->cnf.rtr_solicit_interval);
5684 idev->rs_probes = 1;
5685 addrconf_mod_rs_timer(idev, idev->rs_interval);
5686 }
5687
5688
5689 list_for_each_entry(ifp, &idev->addr_list, if_list) {
5690 spin_lock(&ifp->lock);
5691 if (ifp->tokenized) {
5692 ifp->valid_lft = 0;
5693 ifp->prefered_lft = 0;
5694 }
5695 spin_unlock(&ifp->lock);
5696 }
5697
5698 write_unlock_bh(&idev->lock);
5699 inet6_ifinfo_notify(RTM_NEWLINK, idev);
5700 addrconf_verify_rtnl();
5701 return 0;
5702}
5703
5704static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
5705 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
5706 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
5707};
5708
5709static int check_addr_gen_mode(int mode)
5710{
5711 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
5712 mode != IN6_ADDR_GEN_MODE_NONE &&
5713 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5714 mode != IN6_ADDR_GEN_MODE_RANDOM)
5715 return -EINVAL;
5716 return 1;
5717}
5718
5719static int check_stable_privacy(struct inet6_dev *idev, struct net *net,
5720 int mode)
5721{
5722 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
5723 !idev->cnf.stable_secret.initialized &&
5724 !net->ipv6.devconf_dflt->stable_secret.initialized)
5725 return -EINVAL;
5726 return 1;
5727}
5728
5729static int inet6_validate_link_af(const struct net_device *dev,
5730 const struct nlattr *nla)
5731{
5732 struct nlattr *tb[IFLA_INET6_MAX + 1];
5733 struct inet6_dev *idev = NULL;
5734 int err;
5735
5736 if (dev) {
5737 idev = __in6_dev_get(dev);
5738 if (!idev)
5739 return -EAFNOSUPPORT;
5740 }
5741
5742 err = nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla,
5743 inet6_af_policy, NULL);
5744 if (err)
5745 return err;
5746
5747 if (!tb[IFLA_INET6_TOKEN] && !tb[IFLA_INET6_ADDR_GEN_MODE])
5748 return -EINVAL;
5749
5750 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5751 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5752
5753 if (check_addr_gen_mode(mode) < 0)
5754 return -EINVAL;
5755 if (dev && check_stable_privacy(idev, dev_net(dev), mode) < 0)
5756 return -EINVAL;
5757 }
5758
5759 return 0;
5760}
5761
5762static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
5763{
5764 struct inet6_dev *idev = __in6_dev_get(dev);
5765 struct nlattr *tb[IFLA_INET6_MAX + 1];
5766 int err;
5767
5768 if (!idev)
5769 return -EAFNOSUPPORT;
5770
5771 if (nla_parse_nested_deprecated(tb, IFLA_INET6_MAX, nla, NULL, NULL) < 0)
5772 BUG();
5773
5774 if (tb[IFLA_INET6_TOKEN]) {
5775 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
5776 if (err)
5777 return err;
5778 }
5779
5780 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
5781 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
5782
5783 idev->cnf.addr_gen_mode = mode;
5784 }
5785
5786 return 0;
5787}
5788
5789static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
5790 u32 portid, u32 seq, int event, unsigned int flags)
5791{
5792 struct net_device *dev = idev->dev;
5793 struct ifinfomsg *hdr;
5794 struct nlmsghdr *nlh;
5795 void *protoinfo;
5796
5797 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
5798 if (!nlh)
5799 return -EMSGSIZE;
5800
5801 hdr = nlmsg_data(nlh);
5802 hdr->ifi_family = AF_INET6;
5803 hdr->__ifi_pad = 0;
5804 hdr->ifi_type = dev->type;
5805 hdr->ifi_index = dev->ifindex;
5806 hdr->ifi_flags = dev_get_flags(dev);
5807 hdr->ifi_change = 0;
5808
5809 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
5810 (dev->addr_len &&
5811 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
5812 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
5813 (dev->ifindex != dev_get_iflink(dev) &&
5814 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
5815 nla_put_u8(skb, IFLA_OPERSTATE,
5816 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
5817 goto nla_put_failure;
5818 protoinfo = nla_nest_start_noflag(skb, IFLA_PROTINFO);
5819 if (!protoinfo)
5820 goto nla_put_failure;
5821
5822 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
5823 goto nla_put_failure;
5824
5825 nla_nest_end(skb, protoinfo);
5826 nlmsg_end(skb, nlh);
5827 return 0;
5828
5829nla_put_failure:
5830 nlmsg_cancel(skb, nlh);
5831 return -EMSGSIZE;
5832}
5833
5834static int inet6_valid_dump_ifinfo(const struct nlmsghdr *nlh,
5835 struct netlink_ext_ack *extack)
5836{
5837 struct ifinfomsg *ifm;
5838
5839 if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifm))) {
5840 NL_SET_ERR_MSG_MOD(extack, "Invalid header for link dump request");
5841 return -EINVAL;
5842 }
5843
5844 if (nlmsg_attrlen(nlh, sizeof(*ifm))) {
5845 NL_SET_ERR_MSG_MOD(extack, "Invalid data after header");
5846 return -EINVAL;
5847 }
5848
5849 ifm = nlmsg_data(nlh);
5850 if (ifm->__ifi_pad || ifm->ifi_type || ifm->ifi_flags ||
5851 ifm->ifi_change || ifm->ifi_index) {
5852 NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for dump request");
5853 return -EINVAL;
5854 }
5855
5856 return 0;
5857}
5858
5859static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
5860{
5861 struct net *net = sock_net(skb->sk);
5862 int h, s_h;
5863 int idx = 0, s_idx;
5864 struct net_device *dev;
5865 struct inet6_dev *idev;
5866 struct hlist_head *head;
5867
5868
5869
5870
5871 if (cb->strict_check) {
5872 int err = inet6_valid_dump_ifinfo(cb->nlh, cb->extack);
5873
5874 if (err < 0)
5875 return err;
5876 }
5877
5878 s_h = cb->args[0];
5879 s_idx = cb->args[1];
5880
5881 rcu_read_lock();
5882 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5883 idx = 0;
5884 head = &net->dev_index_head[h];
5885 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5886 if (idx < s_idx)
5887 goto cont;
5888 idev = __in6_dev_get(dev);
5889 if (!idev)
5890 goto cont;
5891 if (inet6_fill_ifinfo(skb, idev,
5892 NETLINK_CB(cb->skb).portid,
5893 cb->nlh->nlmsg_seq,
5894 RTM_NEWLINK, NLM_F_MULTI) < 0)
5895 goto out;
5896cont:
5897 idx++;
5898 }
5899 }
5900out:
5901 rcu_read_unlock();
5902 cb->args[1] = idx;
5903 cb->args[0] = h;
5904
5905 return skb->len;
5906}
5907
5908void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5909{
5910 struct sk_buff *skb;
5911 struct net *net = dev_net(idev->dev);
5912 int err = -ENOBUFS;
5913
5914 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5915 if (!skb)
5916 goto errout;
5917
5918 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5919 if (err < 0) {
5920
5921 WARN_ON(err == -EMSGSIZE);
5922 kfree_skb(skb);
5923 goto errout;
5924 }
5925 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5926 return;
5927errout:
5928 if (err < 0)
5929 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5930}
5931
5932static inline size_t inet6_prefix_nlmsg_size(void)
5933{
5934 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5935 + nla_total_size(sizeof(struct in6_addr))
5936 + nla_total_size(sizeof(struct prefix_cacheinfo));
5937}
5938
5939static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5940 struct prefix_info *pinfo, u32 portid, u32 seq,
5941 int event, unsigned int flags)
5942{
5943 struct prefixmsg *pmsg;
5944 struct nlmsghdr *nlh;
5945 struct prefix_cacheinfo ci;
5946
5947 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5948 if (!nlh)
5949 return -EMSGSIZE;
5950
5951 pmsg = nlmsg_data(nlh);
5952 pmsg->prefix_family = AF_INET6;
5953 pmsg->prefix_pad1 = 0;
5954 pmsg->prefix_pad2 = 0;
5955 pmsg->prefix_ifindex = idev->dev->ifindex;
5956 pmsg->prefix_len = pinfo->prefix_len;
5957 pmsg->prefix_type = pinfo->type;
5958 pmsg->prefix_pad3 = 0;
5959 pmsg->prefix_flags = 0;
5960 if (pinfo->onlink)
5961 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5962 if (pinfo->autoconf)
5963 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5964
5965 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5966 goto nla_put_failure;
5967 ci.preferred_time = ntohl(pinfo->prefered);
5968 ci.valid_time = ntohl(pinfo->valid);
5969 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5970 goto nla_put_failure;
5971 nlmsg_end(skb, nlh);
5972 return 0;
5973
5974nla_put_failure:
5975 nlmsg_cancel(skb, nlh);
5976 return -EMSGSIZE;
5977}
5978
5979static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5980 struct prefix_info *pinfo)
5981{
5982 struct sk_buff *skb;
5983 struct net *net = dev_net(idev->dev);
5984 int err = -ENOBUFS;
5985
5986 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5987 if (!skb)
5988 goto errout;
5989
5990 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5991 if (err < 0) {
5992
5993 WARN_ON(err == -EMSGSIZE);
5994 kfree_skb(skb);
5995 goto errout;
5996 }
5997 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5998 return;
5999errout:
6000 if (err < 0)
6001 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
6002}
6003
6004static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6005{
6006 struct net *net = dev_net(ifp->idev->dev);
6007
6008 if (event)
6009 ASSERT_RTNL();
6010
6011 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
6012
6013 switch (event) {
6014 case RTM_NEWADDR:
6015
6016
6017
6018
6019
6020
6021
6022
6023 if (ifp->rt && !rcu_access_pointer(ifp->rt->fib6_node)) {
6024 ip6_ins_rt(net, ifp->rt);
6025 } else if (!ifp->rt && (ifp->idev->dev->flags & IFF_UP)) {
6026 pr_warn("BUG: Address %pI6c on device %s is missing its host route.\n",
6027 &ifp->addr, ifp->idev->dev->name);
6028 }
6029
6030 if (ifp->idev->cnf.forwarding)
6031 addrconf_join_anycast(ifp);
6032 if (!ipv6_addr_any(&ifp->peer_addr))
6033 addrconf_prefix_route(&ifp->peer_addr, 128,
6034 ifp->rt_priority, ifp->idev->dev,
6035 0, 0, GFP_ATOMIC);
6036 break;
6037 case RTM_DELADDR:
6038 if (ifp->idev->cnf.forwarding)
6039 addrconf_leave_anycast(ifp);
6040 addrconf_leave_solict(ifp->idev, &ifp->addr);
6041 if (!ipv6_addr_any(&ifp->peer_addr)) {
6042 struct fib6_info *rt;
6043
6044 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
6045 ifp->idev->dev, 0, 0,
6046 false);
6047 if (rt)
6048 ip6_del_rt(net, rt, false);
6049 }
6050 if (ifp->rt) {
6051 ip6_del_rt(net, ifp->rt, false);
6052 ifp->rt = NULL;
6053 }
6054 rt_genid_bump_ipv6(net);
6055 break;
6056 }
6057 atomic_inc(&net->ipv6.dev_addr_genid);
6058}
6059
6060static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
6061{
6062 rcu_read_lock_bh();
6063 if (likely(ifp->idev->dead == 0))
6064 __ipv6_ifa_notify(event, ifp);
6065 rcu_read_unlock_bh();
6066}
6067
6068#ifdef CONFIG_SYSCTL
6069
6070static int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
6071 void *buffer, size_t *lenp, loff_t *ppos)
6072{
6073 int *valp = ctl->data;
6074 int val = *valp;
6075 loff_t pos = *ppos;
6076 struct ctl_table lctl;
6077 int ret;
6078
6079
6080
6081
6082
6083 lctl = *ctl;
6084 lctl.data = &val;
6085
6086 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6087
6088 if (write)
6089 ret = addrconf_fixup_forwarding(ctl, valp, val);
6090 if (ret)
6091 *ppos = pos;
6092 return ret;
6093}
6094
6095static int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
6096 void *buffer, size_t *lenp, loff_t *ppos)
6097{
6098 struct inet6_dev *idev = ctl->extra1;
6099 int min_mtu = IPV6_MIN_MTU;
6100 struct ctl_table lctl;
6101
6102 lctl = *ctl;
6103 lctl.extra1 = &min_mtu;
6104 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
6105
6106 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
6107}
6108
6109static void dev_disable_change(struct inet6_dev *idev)
6110{
6111 struct netdev_notifier_info info;
6112
6113 if (!idev || !idev->dev)
6114 return;
6115
6116 netdev_notifier_info_init(&info, idev->dev);
6117 if (idev->cnf.disable_ipv6)
6118 addrconf_notify(NULL, NETDEV_DOWN, &info);
6119 else
6120 addrconf_notify(NULL, NETDEV_UP, &info);
6121}
6122
6123static void addrconf_disable_change(struct net *net, __s32 newf)
6124{
6125 struct net_device *dev;
6126 struct inet6_dev *idev;
6127
6128 for_each_netdev(net, dev) {
6129 idev = __in6_dev_get(dev);
6130 if (idev) {
6131 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
6132 idev->cnf.disable_ipv6 = newf;
6133 if (changed)
6134 dev_disable_change(idev);
6135 }
6136 }
6137}
6138
6139static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
6140{
6141 struct net *net;
6142 int old;
6143
6144 if (!rtnl_trylock())
6145 return restart_syscall();
6146
6147 net = (struct net *)table->extra2;
6148 old = *p;
6149 *p = newf;
6150
6151 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
6152 rtnl_unlock();
6153 return 0;
6154 }
6155
6156 if (p == &net->ipv6.devconf_all->disable_ipv6) {
6157 net->ipv6.devconf_dflt->disable_ipv6 = newf;
6158 addrconf_disable_change(net, newf);
6159 } else if ((!newf) ^ (!old))
6160 dev_disable_change((struct inet6_dev *)table->extra1);
6161
6162 rtnl_unlock();
6163 return 0;
6164}
6165
6166static int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
6167 void *buffer, size_t *lenp, loff_t *ppos)
6168{
6169 int *valp = ctl->data;
6170 int val = *valp;
6171 loff_t pos = *ppos;
6172 struct ctl_table lctl;
6173 int ret;
6174
6175
6176
6177
6178
6179 lctl = *ctl;
6180 lctl.data = &val;
6181
6182 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6183
6184 if (write)
6185 ret = addrconf_disable_ipv6(ctl, valp, val);
6186 if (ret)
6187 *ppos = pos;
6188 return ret;
6189}
6190
6191static int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
6192 void *buffer, size_t *lenp, loff_t *ppos)
6193{
6194 int *valp = ctl->data;
6195 int ret;
6196 int old, new;
6197
6198 old = *valp;
6199 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
6200 new = *valp;
6201
6202 if (write && old != new) {
6203 struct net *net = ctl->extra2;
6204
6205 if (!rtnl_trylock())
6206 return restart_syscall();
6207
6208 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
6209 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6210 NETCONFA_PROXY_NEIGH,
6211 NETCONFA_IFINDEX_DEFAULT,
6212 net->ipv6.devconf_dflt);
6213 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
6214 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6215 NETCONFA_PROXY_NEIGH,
6216 NETCONFA_IFINDEX_ALL,
6217 net->ipv6.devconf_all);
6218 else {
6219 struct inet6_dev *idev = ctl->extra1;
6220
6221 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF,
6222 NETCONFA_PROXY_NEIGH,
6223 idev->dev->ifindex,
6224 &idev->cnf);
6225 }
6226 rtnl_unlock();
6227 }
6228
6229 return ret;
6230}
6231
6232static int addrconf_sysctl_addr_gen_mode(struct ctl_table *ctl, int write,
6233 void *buffer, size_t *lenp,
6234 loff_t *ppos)
6235{
6236 int ret = 0;
6237 u32 new_val;
6238 struct inet6_dev *idev = (struct inet6_dev *)ctl->extra1;
6239 struct net *net = (struct net *)ctl->extra2;
6240 struct ctl_table tmp = {
6241 .data = &new_val,
6242 .maxlen = sizeof(new_val),
6243 .mode = ctl->mode,
6244 };
6245
6246 if (!rtnl_trylock())
6247 return restart_syscall();
6248
6249 new_val = *((u32 *)ctl->data);
6250
6251 ret = proc_douintvec(&tmp, write, buffer, lenp, ppos);
6252 if (ret != 0)
6253 goto out;
6254
6255 if (write) {
6256 if (check_addr_gen_mode(new_val) < 0) {
6257 ret = -EINVAL;
6258 goto out;
6259 }
6260
6261 if (idev) {
6262 if (check_stable_privacy(idev, net, new_val) < 0) {
6263 ret = -EINVAL;
6264 goto out;
6265 }
6266
6267 if (idev->cnf.addr_gen_mode != new_val) {
6268 idev->cnf.addr_gen_mode = new_val;
6269 addrconf_dev_config(idev->dev);
6270 }
6271 } else if (&net->ipv6.devconf_all->addr_gen_mode == ctl->data) {
6272 struct net_device *dev;
6273
6274 net->ipv6.devconf_dflt->addr_gen_mode = new_val;
6275 for_each_netdev(net, dev) {
6276 idev = __in6_dev_get(dev);
6277 if (idev &&
6278 idev->cnf.addr_gen_mode != new_val) {
6279 idev->cnf.addr_gen_mode = new_val;
6280 addrconf_dev_config(idev->dev);
6281 }
6282 }
6283 }
6284
6285 *((u32 *)ctl->data) = new_val;
6286 }
6287
6288out:
6289 rtnl_unlock();
6290
6291 return ret;
6292}
6293
6294static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
6295 void *buffer, size_t *lenp,
6296 loff_t *ppos)
6297{
6298 int err;
6299 struct in6_addr addr;
6300 char str[IPV6_MAX_STRLEN];
6301 struct ctl_table lctl = *ctl;
6302 struct net *net = ctl->extra2;
6303 struct ipv6_stable_secret *secret = ctl->data;
6304
6305 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
6306 return -EIO;
6307
6308 lctl.maxlen = IPV6_MAX_STRLEN;
6309 lctl.data = str;
6310
6311 if (!rtnl_trylock())
6312 return restart_syscall();
6313
6314 if (!write && !secret->initialized) {
6315 err = -EIO;
6316 goto out;
6317 }
6318
6319 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
6320 if (err >= sizeof(str)) {
6321 err = -EIO;
6322 goto out;
6323 }
6324
6325 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
6326 if (err || !write)
6327 goto out;
6328
6329 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
6330 err = -EIO;
6331 goto out;
6332 }
6333
6334 secret->initialized = true;
6335 secret->secret = addr;
6336
6337 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
6338 struct net_device *dev;
6339
6340 for_each_netdev(net, dev) {
6341 struct inet6_dev *idev = __in6_dev_get(dev);
6342
6343 if (idev) {
6344 idev->cnf.addr_gen_mode =
6345 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6346 }
6347 }
6348 } else {
6349 struct inet6_dev *idev = ctl->extra1;
6350
6351 idev->cnf.addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
6352 }
6353
6354out:
6355 rtnl_unlock();
6356
6357 return err;
6358}
6359
6360static
6361int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
6362 int write, void *buffer,
6363 size_t *lenp,
6364 loff_t *ppos)
6365{
6366 int *valp = ctl->data;
6367 int val = *valp;
6368 loff_t pos = *ppos;
6369 struct ctl_table lctl;
6370 int ret;
6371
6372
6373
6374
6375 lctl = *ctl;
6376 lctl.data = &val;
6377
6378 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6379
6380 if (write)
6381 ret = addrconf_fixup_linkdown(ctl, valp, val);
6382 if (ret)
6383 *ppos = pos;
6384 return ret;
6385}
6386
6387static
6388void addrconf_set_nopolicy(struct rt6_info *rt, int action)
6389{
6390 if (rt) {
6391 if (action)
6392 rt->dst.flags |= DST_NOPOLICY;
6393 else
6394 rt->dst.flags &= ~DST_NOPOLICY;
6395 }
6396}
6397
6398static
6399void addrconf_disable_policy_idev(struct inet6_dev *idev, int val)
6400{
6401 struct inet6_ifaddr *ifa;
6402
6403 read_lock_bh(&idev->lock);
6404 list_for_each_entry(ifa, &idev->addr_list, if_list) {
6405 spin_lock(&ifa->lock);
6406 if (ifa->rt) {
6407
6408 struct fib6_nh *nh = ifa->rt->fib6_nh;
6409 int cpu;
6410
6411 rcu_read_lock();
6412 ifa->rt->dst_nopolicy = val ? true : false;
6413 if (nh->rt6i_pcpu) {
6414 for_each_possible_cpu(cpu) {
6415 struct rt6_info **rtp;
6416
6417 rtp = per_cpu_ptr(nh->rt6i_pcpu, cpu);
6418 addrconf_set_nopolicy(*rtp, val);
6419 }
6420 }
6421 rcu_read_unlock();
6422 }
6423 spin_unlock(&ifa->lock);
6424 }
6425 read_unlock_bh(&idev->lock);
6426}
6427
6428static
6429int addrconf_disable_policy(struct ctl_table *ctl, int *valp, int val)
6430{
6431 struct inet6_dev *idev;
6432 struct net *net;
6433
6434 if (!rtnl_trylock())
6435 return restart_syscall();
6436
6437 *valp = val;
6438
6439 net = (struct net *)ctl->extra2;
6440 if (valp == &net->ipv6.devconf_dflt->disable_policy) {
6441 rtnl_unlock();
6442 return 0;
6443 }
6444
6445 if (valp == &net->ipv6.devconf_all->disable_policy) {
6446 struct net_device *dev;
6447
6448 for_each_netdev(net, dev) {
6449 idev = __in6_dev_get(dev);
6450 if (idev)
6451 addrconf_disable_policy_idev(idev, val);
6452 }
6453 } else {
6454 idev = (struct inet6_dev *)ctl->extra1;
6455 addrconf_disable_policy_idev(idev, val);
6456 }
6457
6458 rtnl_unlock();
6459 return 0;
6460}
6461
6462static int addrconf_sysctl_disable_policy(struct ctl_table *ctl, int write,
6463 void *buffer, size_t *lenp, loff_t *ppos)
6464{
6465 int *valp = ctl->data;
6466 int val = *valp;
6467 loff_t pos = *ppos;
6468 struct ctl_table lctl;
6469 int ret;
6470
6471 lctl = *ctl;
6472 lctl.data = &val;
6473 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
6474
6475 if (write && (*valp != val))
6476 ret = addrconf_disable_policy(ctl, valp, val);
6477
6478 if (ret)
6479 *ppos = pos;
6480
6481 return ret;
6482}
6483
6484static int minus_one = -1;
6485static const int two_five_five = 255;
6486
6487static const struct ctl_table addrconf_sysctl[] = {
6488 {
6489 .procname = "forwarding",
6490 .data = &ipv6_devconf.forwarding,
6491 .maxlen = sizeof(int),
6492 .mode = 0644,
6493 .proc_handler = addrconf_sysctl_forward,
6494 },
6495 {
6496 .procname = "hop_limit",
6497 .data = &ipv6_devconf.hop_limit,
6498 .maxlen = sizeof(int),
6499 .mode = 0644,
6500 .proc_handler = proc_dointvec_minmax,
6501 .extra1 = (void *)SYSCTL_ONE,
6502 .extra2 = (void *)&two_five_five,
6503 },
6504 {
6505 .procname = "mtu",
6506 .data = &ipv6_devconf.mtu6,
6507 .maxlen = sizeof(int),
6508 .mode = 0644,
6509 .proc_handler = addrconf_sysctl_mtu,
6510 },
6511 {
6512 .procname = "accept_ra",
6513 .data = &ipv6_devconf.accept_ra,
6514 .maxlen = sizeof(int),
6515 .mode = 0644,
6516 .proc_handler = proc_dointvec,
6517 },
6518 {
6519 .procname = "accept_redirects",
6520 .data = &ipv6_devconf.accept_redirects,
6521 .maxlen = sizeof(int),
6522 .mode = 0644,
6523 .proc_handler = proc_dointvec,
6524 },
6525 {
6526 .procname = "autoconf",
6527 .data = &ipv6_devconf.autoconf,
6528 .maxlen = sizeof(int),
6529 .mode = 0644,
6530 .proc_handler = proc_dointvec,
6531 },
6532 {
6533 .procname = "dad_transmits",
6534 .data = &ipv6_devconf.dad_transmits,
6535 .maxlen = sizeof(int),
6536 .mode = 0644,
6537 .proc_handler = proc_dointvec,
6538 },
6539 {
6540 .procname = "router_solicitations",
6541 .data = &ipv6_devconf.rtr_solicits,
6542 .maxlen = sizeof(int),
6543 .mode = 0644,
6544 .proc_handler = proc_dointvec_minmax,
6545 .extra1 = &minus_one,
6546 },
6547 {
6548 .procname = "router_solicitation_interval",
6549 .data = &ipv6_devconf.rtr_solicit_interval,
6550 .maxlen = sizeof(int),
6551 .mode = 0644,
6552 .proc_handler = proc_dointvec_jiffies,
6553 },
6554 {
6555 .procname = "router_solicitation_max_interval",
6556 .data = &ipv6_devconf.rtr_solicit_max_interval,
6557 .maxlen = sizeof(int),
6558 .mode = 0644,
6559 .proc_handler = proc_dointvec_jiffies,
6560 },
6561 {
6562 .procname = "router_solicitation_delay",
6563 .data = &ipv6_devconf.rtr_solicit_delay,
6564 .maxlen = sizeof(int),
6565 .mode = 0644,
6566 .proc_handler = proc_dointvec_jiffies,
6567 },
6568 {
6569 .procname = "force_mld_version",
6570 .data = &ipv6_devconf.force_mld_version,
6571 .maxlen = sizeof(int),
6572 .mode = 0644,
6573 .proc_handler = proc_dointvec,
6574 },
6575 {
6576 .procname = "mldv1_unsolicited_report_interval",
6577 .data =
6578 &ipv6_devconf.mldv1_unsolicited_report_interval,
6579 .maxlen = sizeof(int),
6580 .mode = 0644,
6581 .proc_handler = proc_dointvec_ms_jiffies,
6582 },
6583 {
6584 .procname = "mldv2_unsolicited_report_interval",
6585 .data =
6586 &ipv6_devconf.mldv2_unsolicited_report_interval,
6587 .maxlen = sizeof(int),
6588 .mode = 0644,
6589 .proc_handler = proc_dointvec_ms_jiffies,
6590 },
6591 {
6592 .procname = "use_tempaddr",
6593 .data = &ipv6_devconf.use_tempaddr,
6594 .maxlen = sizeof(int),
6595 .mode = 0644,
6596 .proc_handler = proc_dointvec,
6597 },
6598 {
6599 .procname = "temp_valid_lft",
6600 .data = &ipv6_devconf.temp_valid_lft,
6601 .maxlen = sizeof(int),
6602 .mode = 0644,
6603 .proc_handler = proc_dointvec,
6604 },
6605 {
6606 .procname = "temp_prefered_lft",
6607 .data = &ipv6_devconf.temp_prefered_lft,
6608 .maxlen = sizeof(int),
6609 .mode = 0644,
6610 .proc_handler = proc_dointvec,
6611 },
6612 {
6613 .procname = "regen_max_retry",
6614 .data = &ipv6_devconf.regen_max_retry,
6615 .maxlen = sizeof(int),
6616 .mode = 0644,
6617 .proc_handler = proc_dointvec,
6618 },
6619 {
6620 .procname = "max_desync_factor",
6621 .data = &ipv6_devconf.max_desync_factor,
6622 .maxlen = sizeof(int),
6623 .mode = 0644,
6624 .proc_handler = proc_dointvec,
6625 },
6626 {
6627 .procname = "max_addresses",
6628 .data = &ipv6_devconf.max_addresses,
6629 .maxlen = sizeof(int),
6630 .mode = 0644,
6631 .proc_handler = proc_dointvec,
6632 },
6633 {
6634 .procname = "accept_ra_defrtr",
6635 .data = &ipv6_devconf.accept_ra_defrtr,
6636 .maxlen = sizeof(int),
6637 .mode = 0644,
6638 .proc_handler = proc_dointvec,
6639 },
6640 {
6641 .procname = "accept_ra_min_hop_limit",
6642 .data = &ipv6_devconf.accept_ra_min_hop_limit,
6643 .maxlen = sizeof(int),
6644 .mode = 0644,
6645 .proc_handler = proc_dointvec,
6646 },
6647 {
6648 .procname = "accept_ra_pinfo",
6649 .data = &ipv6_devconf.accept_ra_pinfo,
6650 .maxlen = sizeof(int),
6651 .mode = 0644,
6652 .proc_handler = proc_dointvec,
6653 },
6654#ifdef CONFIG_IPV6_ROUTER_PREF
6655 {
6656 .procname = "accept_ra_rtr_pref",
6657 .data = &ipv6_devconf.accept_ra_rtr_pref,
6658 .maxlen = sizeof(int),
6659 .mode = 0644,
6660 .proc_handler = proc_dointvec,
6661 },
6662 {
6663 .procname = "router_probe_interval",
6664 .data = &ipv6_devconf.rtr_probe_interval,
6665 .maxlen = sizeof(int),
6666 .mode = 0644,
6667 .proc_handler = proc_dointvec_jiffies,
6668 },
6669#ifdef CONFIG_IPV6_ROUTE_INFO
6670 {
6671 .procname = "accept_ra_rt_info_min_plen",
6672 .data = &ipv6_devconf.accept_ra_rt_info_min_plen,
6673 .maxlen = sizeof(int),
6674 .mode = 0644,
6675 .proc_handler = proc_dointvec,
6676 },
6677 {
6678 .procname = "accept_ra_rt_info_max_plen",
6679 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
6680 .maxlen = sizeof(int),
6681 .mode = 0644,
6682 .proc_handler = proc_dointvec,
6683 },
6684#endif
6685#endif
6686 {
6687 .procname = "proxy_ndp",
6688 .data = &ipv6_devconf.proxy_ndp,
6689 .maxlen = sizeof(int),
6690 .mode = 0644,
6691 .proc_handler = addrconf_sysctl_proxy_ndp,
6692 },
6693 {
6694 .procname = "accept_source_route",
6695 .data = &ipv6_devconf.accept_source_route,
6696 .maxlen = sizeof(int),
6697 .mode = 0644,
6698 .proc_handler = proc_dointvec,
6699 },
6700#ifdef CONFIG_IPV6_OPTIMISTIC_DAD
6701 {
6702 .procname = "optimistic_dad",
6703 .data = &ipv6_devconf.optimistic_dad,
6704 .maxlen = sizeof(int),
6705 .mode = 0644,
6706 .proc_handler = proc_dointvec,
6707 },
6708 {
6709 .procname = "use_optimistic",
6710 .data = &ipv6_devconf.use_optimistic,
6711 .maxlen = sizeof(int),
6712 .mode = 0644,
6713 .proc_handler = proc_dointvec,
6714 },
6715#endif
6716#ifdef CONFIG_IPV6_MROUTE
6717 {
6718 .procname = "mc_forwarding",
6719 .data = &ipv6_devconf.mc_forwarding,
6720 .maxlen = sizeof(int),
6721 .mode = 0444,
6722 .proc_handler = proc_dointvec,
6723 },
6724#endif
6725 {
6726 .procname = "disable_ipv6",
6727 .data = &ipv6_devconf.disable_ipv6,
6728 .maxlen = sizeof(int),
6729 .mode = 0644,
6730 .proc_handler = addrconf_sysctl_disable,
6731 },
6732 {
6733 .procname = "accept_dad",
6734 .data = &ipv6_devconf.accept_dad,
6735 .maxlen = sizeof(int),
6736 .mode = 0644,
6737 .proc_handler = proc_dointvec,
6738 },
6739 {
6740 .procname = "force_tllao",
6741 .data = &ipv6_devconf.force_tllao,
6742 .maxlen = sizeof(int),
6743 .mode = 0644,
6744 .proc_handler = proc_dointvec
6745 },
6746 {
6747 .procname = "ndisc_notify",
6748 .data = &ipv6_devconf.ndisc_notify,
6749 .maxlen = sizeof(int),
6750 .mode = 0644,
6751 .proc_handler = proc_dointvec
6752 },
6753 {
6754 .procname = "suppress_frag_ndisc",
6755 .data = &ipv6_devconf.suppress_frag_ndisc,
6756 .maxlen = sizeof(int),
6757 .mode = 0644,
6758 .proc_handler = proc_dointvec
6759 },
6760 {
6761 .procname = "accept_ra_from_local",
6762 .data = &ipv6_devconf.accept_ra_from_local,
6763 .maxlen = sizeof(int),
6764 .mode = 0644,
6765 .proc_handler = proc_dointvec,
6766 },
6767 {
6768 .procname = "accept_ra_mtu",
6769 .data = &ipv6_devconf.accept_ra_mtu,
6770 .maxlen = sizeof(int),
6771 .mode = 0644,
6772 .proc_handler = proc_dointvec,
6773 },
6774 {
6775 .procname = "stable_secret",
6776 .data = &ipv6_devconf.stable_secret,
6777 .maxlen = IPV6_MAX_STRLEN,
6778 .mode = 0600,
6779 .proc_handler = addrconf_sysctl_stable_secret,
6780 },
6781 {
6782 .procname = "use_oif_addrs_only",
6783 .data = &ipv6_devconf.use_oif_addrs_only,
6784 .maxlen = sizeof(int),
6785 .mode = 0644,
6786 .proc_handler = proc_dointvec,
6787 },
6788 {
6789 .procname = "ignore_routes_with_linkdown",
6790 .data = &ipv6_devconf.ignore_routes_with_linkdown,
6791 .maxlen = sizeof(int),
6792 .mode = 0644,
6793 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
6794 },
6795 {
6796 .procname = "drop_unicast_in_l2_multicast",
6797 .data = &ipv6_devconf.drop_unicast_in_l2_multicast,
6798 .maxlen = sizeof(int),
6799 .mode = 0644,
6800 .proc_handler = proc_dointvec,
6801 },
6802 {
6803 .procname = "drop_unsolicited_na",
6804 .data = &ipv6_devconf.drop_unsolicited_na,
6805 .maxlen = sizeof(int),
6806 .mode = 0644,
6807 .proc_handler = proc_dointvec,
6808 },
6809 {
6810 .procname = "keep_addr_on_down",
6811 .data = &ipv6_devconf.keep_addr_on_down,
6812 .maxlen = sizeof(int),
6813 .mode = 0644,
6814 .proc_handler = proc_dointvec,
6815
6816 },
6817 {
6818 .procname = "seg6_enabled",
6819 .data = &ipv6_devconf.seg6_enabled,
6820 .maxlen = sizeof(int),
6821 .mode = 0644,
6822 .proc_handler = proc_dointvec,
6823 },
6824#ifdef CONFIG_IPV6_SEG6_HMAC
6825 {
6826 .procname = "seg6_require_hmac",
6827 .data = &ipv6_devconf.seg6_require_hmac,
6828 .maxlen = sizeof(int),
6829 .mode = 0644,
6830 .proc_handler = proc_dointvec,
6831 },
6832#endif
6833 {
6834 .procname = "enhanced_dad",
6835 .data = &ipv6_devconf.enhanced_dad,
6836 .maxlen = sizeof(int),
6837 .mode = 0644,
6838 .proc_handler = proc_dointvec,
6839 },
6840 {
6841 .procname = "addr_gen_mode",
6842 .data = &ipv6_devconf.addr_gen_mode,
6843 .maxlen = sizeof(int),
6844 .mode = 0644,
6845 .proc_handler = addrconf_sysctl_addr_gen_mode,
6846 },
6847 {
6848 .procname = "disable_policy",
6849 .data = &ipv6_devconf.disable_policy,
6850 .maxlen = sizeof(int),
6851 .mode = 0644,
6852 .proc_handler = addrconf_sysctl_disable_policy,
6853 },
6854 {
6855 .procname = "ndisc_tclass",
6856 .data = &ipv6_devconf.ndisc_tclass,
6857 .maxlen = sizeof(int),
6858 .mode = 0644,
6859 .proc_handler = proc_dointvec_minmax,
6860 .extra1 = (void *)SYSCTL_ZERO,
6861 .extra2 = (void *)&two_five_five,
6862 },
6863 {
6864 .procname = "rpl_seg_enabled",
6865 .data = &ipv6_devconf.rpl_seg_enabled,
6866 .maxlen = sizeof(int),
6867 .mode = 0644,
6868 .proc_handler = proc_dointvec,
6869 },
6870 {
6871
6872 }
6873};
6874
6875static int __addrconf_sysctl_register(struct net *net, char *dev_name,
6876 struct inet6_dev *idev, struct ipv6_devconf *p)
6877{
6878 int i, ifindex;
6879 struct ctl_table *table;
6880 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
6881
6882 table = kmemdup(addrconf_sysctl, sizeof(addrconf_sysctl), GFP_KERNEL);
6883 if (!table)
6884 goto out;
6885
6886 for (i = 0; table[i].data; i++) {
6887 table[i].data += (char *)p - (char *)&ipv6_devconf;
6888
6889
6890
6891
6892 if (!table[i].extra1 && !table[i].extra2) {
6893 table[i].extra1 = idev;
6894 table[i].extra2 = net;
6895 }
6896 }
6897
6898 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
6899
6900 p->sysctl_header = register_net_sysctl(net, path, table);
6901 if (!p->sysctl_header)
6902 goto free;
6903
6904 if (!strcmp(dev_name, "all"))
6905 ifindex = NETCONFA_IFINDEX_ALL;
6906 else if (!strcmp(dev_name, "default"))
6907 ifindex = NETCONFA_IFINDEX_DEFAULT;
6908 else
6909 ifindex = idev->dev->ifindex;
6910 inet6_netconf_notify_devconf(net, RTM_NEWNETCONF, NETCONFA_ALL,
6911 ifindex, p);
6912 return 0;
6913
6914free:
6915 kfree(table);
6916out:
6917 return -ENOBUFS;
6918}
6919
6920static void __addrconf_sysctl_unregister(struct net *net,
6921 struct ipv6_devconf *p, int ifindex)
6922{
6923 struct ctl_table *table;
6924
6925 if (!p->sysctl_header)
6926 return;
6927
6928 table = p->sysctl_header->ctl_table_arg;
6929 unregister_net_sysctl_table(p->sysctl_header);
6930 p->sysctl_header = NULL;
6931 kfree(table);
6932
6933 inet6_netconf_notify_devconf(net, RTM_DELNETCONF, 0, ifindex, NULL);
6934}
6935
6936static int addrconf_sysctl_register(struct inet6_dev *idev)
6937{
6938 int err;
6939
6940 if (!sysctl_dev_name_is_allowed(idev->dev->name))
6941 return -EINVAL;
6942
6943 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
6944 &ndisc_ifinfo_sysctl_change);
6945 if (err)
6946 return err;
6947 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
6948 idev, &idev->cnf);
6949 if (err)
6950 neigh_sysctl_unregister(idev->nd_parms);
6951
6952 return err;
6953}
6954
6955static void addrconf_sysctl_unregister(struct inet6_dev *idev)
6956{
6957 __addrconf_sysctl_unregister(dev_net(idev->dev), &idev->cnf,
6958 idev->dev->ifindex);
6959 neigh_sysctl_unregister(idev->nd_parms);
6960}
6961
6962
6963#endif
6964
6965static int __net_init addrconf_init_net(struct net *net)
6966{
6967 int err = -ENOMEM;
6968 struct ipv6_devconf *all, *dflt;
6969
6970 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
6971 if (!all)
6972 goto err_alloc_all;
6973
6974 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
6975 if (!dflt)
6976 goto err_alloc_dflt;
6977
6978 if (IS_ENABLED(CONFIG_SYSCTL) &&
6979 !net_eq(net, &init_net)) {
6980 switch (sysctl_devconf_inherit_init_net) {
6981 case 1:
6982 memcpy(all, init_net.ipv6.devconf_all,
6983 sizeof(ipv6_devconf));
6984 memcpy(dflt, init_net.ipv6.devconf_dflt,
6985 sizeof(ipv6_devconf_dflt));
6986 break;
6987 case 3:
6988 memcpy(all, current->nsproxy->net_ns->ipv6.devconf_all,
6989 sizeof(ipv6_devconf));
6990 memcpy(dflt,
6991 current->nsproxy->net_ns->ipv6.devconf_dflt,
6992 sizeof(ipv6_devconf_dflt));
6993 break;
6994 case 0:
6995 case 2:
6996
6997 break;
6998 }
6999 }
7000
7001
7002 dflt->autoconf = ipv6_defaults.autoconf;
7003 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
7004
7005 dflt->stable_secret.initialized = false;
7006 all->stable_secret.initialized = false;
7007
7008 net->ipv6.devconf_all = all;
7009 net->ipv6.devconf_dflt = dflt;
7010
7011#ifdef CONFIG_SYSCTL
7012 err = __addrconf_sysctl_register(net, "all", NULL, all);
7013 if (err < 0)
7014 goto err_reg_all;
7015
7016 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
7017 if (err < 0)
7018 goto err_reg_dflt;
7019#endif
7020 return 0;
7021
7022#ifdef CONFIG_SYSCTL
7023err_reg_dflt:
7024 __addrconf_sysctl_unregister(net, all, NETCONFA_IFINDEX_ALL);
7025err_reg_all:
7026 kfree(dflt);
7027#endif
7028err_alloc_dflt:
7029 kfree(all);
7030err_alloc_all:
7031 return err;
7032}
7033
7034static void __net_exit addrconf_exit_net(struct net *net)
7035{
7036#ifdef CONFIG_SYSCTL
7037 __addrconf_sysctl_unregister(net, net->ipv6.devconf_dflt,
7038 NETCONFA_IFINDEX_DEFAULT);
7039 __addrconf_sysctl_unregister(net, net->ipv6.devconf_all,
7040 NETCONFA_IFINDEX_ALL);
7041#endif
7042 kfree(net->ipv6.devconf_dflt);
7043 kfree(net->ipv6.devconf_all);
7044}
7045
7046static struct pernet_operations addrconf_ops = {
7047 .init = addrconf_init_net,
7048 .exit = addrconf_exit_net,
7049};
7050
7051static struct rtnl_af_ops inet6_ops __read_mostly = {
7052 .family = AF_INET6,
7053 .fill_link_af = inet6_fill_link_af,
7054 .get_link_af_size = inet6_get_link_af_size,
7055 .validate_link_af = inet6_validate_link_af,
7056 .set_link_af = inet6_set_link_af,
7057};
7058
7059
7060
7061
7062
7063int __init addrconf_init(void)
7064{
7065 struct inet6_dev *idev;
7066 int i, err;
7067
7068 err = ipv6_addr_label_init();
7069 if (err < 0) {
7070 pr_crit("%s: cannot initialize default policy table: %d\n",
7071 __func__, err);
7072 goto out;
7073 }
7074
7075 err = register_pernet_subsys(&addrconf_ops);
7076 if (err < 0)
7077 goto out_addrlabel;
7078
7079 addrconf_wq = create_workqueue("ipv6_addrconf");
7080 if (!addrconf_wq) {
7081 err = -ENOMEM;
7082 goto out_nowq;
7083 }
7084
7085
7086
7087
7088
7089
7090
7091
7092
7093
7094
7095
7096
7097
7098
7099
7100
7101
7102
7103 rtnl_lock();
7104 idev = ipv6_add_dev(init_net.loopback_dev);
7105 rtnl_unlock();
7106 if (IS_ERR(idev)) {
7107 err = PTR_ERR(idev);
7108 goto errlo;
7109 }
7110
7111 ip6_route_init_special_entries();
7112
7113 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7114 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
7115
7116 register_netdevice_notifier(&ipv6_dev_notf);
7117
7118 addrconf_verify();
7119
7120 rtnl_af_register(&inet6_ops);
7121
7122 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETLINK,
7123 NULL, inet6_dump_ifinfo, 0);
7124 if (err < 0)
7125 goto errout;
7126
7127 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_NEWADDR,
7128 inet6_rtm_newaddr, NULL, 0);
7129 if (err < 0)
7130 goto errout;
7131 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_DELADDR,
7132 inet6_rtm_deladdr, NULL, 0);
7133 if (err < 0)
7134 goto errout;
7135 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETADDR,
7136 inet6_rtm_getaddr, inet6_dump_ifaddr,
7137 RTNL_FLAG_DOIT_UNLOCKED);
7138 if (err < 0)
7139 goto errout;
7140 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETMULTICAST,
7141 NULL, inet6_dump_ifmcaddr, 0);
7142 if (err < 0)
7143 goto errout;
7144 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETANYCAST,
7145 NULL, inet6_dump_ifacaddr, 0);
7146 if (err < 0)
7147 goto errout;
7148 err = rtnl_register_module(THIS_MODULE, PF_INET6, RTM_GETNETCONF,
7149 inet6_netconf_get_devconf,
7150 inet6_netconf_dump_devconf,
7151 RTNL_FLAG_DOIT_UNLOCKED);
7152 if (err < 0)
7153 goto errout;
7154 err = ipv6_addr_label_rtnl_register();
7155 if (err < 0)
7156 goto errout;
7157
7158 return 0;
7159errout:
7160 rtnl_unregister_all(PF_INET6);
7161 rtnl_af_unregister(&inet6_ops);
7162 unregister_netdevice_notifier(&ipv6_dev_notf);
7163errlo:
7164 destroy_workqueue(addrconf_wq);
7165out_nowq:
7166 unregister_pernet_subsys(&addrconf_ops);
7167out_addrlabel:
7168 ipv6_addr_label_cleanup();
7169out:
7170 return err;
7171}
7172
7173void addrconf_cleanup(void)
7174{
7175 struct net_device *dev;
7176 int i;
7177
7178 unregister_netdevice_notifier(&ipv6_dev_notf);
7179 unregister_pernet_subsys(&addrconf_ops);
7180 ipv6_addr_label_cleanup();
7181
7182 rtnl_af_unregister(&inet6_ops);
7183
7184 rtnl_lock();
7185
7186
7187 for_each_netdev(&init_net, dev) {
7188 if (__in6_dev_get(dev) == NULL)
7189 continue;
7190 addrconf_ifdown(dev, 1);
7191 }
7192 addrconf_ifdown(init_net.loopback_dev, 2);
7193
7194
7195
7196
7197 spin_lock_bh(&addrconf_hash_lock);
7198 for (i = 0; i < IN6_ADDR_HSIZE; i++)
7199 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
7200 spin_unlock_bh(&addrconf_hash_lock);
7201 cancel_delayed_work(&addr_chk_work);
7202 rtnl_unlock();
7203
7204 destroy_workqueue(addrconf_wq);
7205}
7206
