2 * IPv6 Address [auto]configuration
3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
7 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
18 * Janos Farkas : delete timer on ifdown
19 * <chexum@bankinf.banki.hu>
20 * Andi Kleen : kill double kfree on module
22 * Maciej W. Rozycki : FDDI support
23 * sekiya@USAGI : Don't send too many RS
25 * yoshfuji@USAGI : Fixed interval between DAD
27 * YOSHIFUJI Hideaki @USAGI : improved accuracy of
28 * address validation timer.
29 * YOSHIFUJI Hideaki @USAGI : Privacy Extensions (RFC3041)
31 * Yuji SEKIYA @USAGI : Don't assign a same IPv6
32 * address on a same interface.
33 * YOSHIFUJI Hideaki @USAGI : ARCnet support
34 * YOSHIFUJI Hideaki @USAGI : convert /proc/net/if_inet6 to
36 * YOSHIFUJI Hideaki @USAGI : improved source address
37 * selection; consider scope,
41 #define pr_fmt(fmt) "IPv6: " fmt
43 #include <linux/errno.h>
44 #include <linux/types.h>
45 #include <linux/kernel.h>
46 #include <linux/socket.h>
47 #include <linux/sockios.h>
48 #include <linux/net.h>
49 #include <linux/inet.h>
50 #include <linux/in6.h>
51 #include <linux/netdevice.h>
52 #include <linux/if_addr.h>
53 #include <linux/if_arp.h>
54 #include <linux/if_arcnet.h>
55 #include <linux/if_infiniband.h>
56 #include <linux/route.h>
57 #include <linux/inetdevice.h>
58 #include <linux/init.h>
59 #include <linux/slab.h>
61 #include <linux/sysctl.h>
63 #include <linux/capability.h>
64 #include <linux/delay.h>
65 #include <linux/notifier.h>
66 #include <linux/string.h>
67 #include <linux/hash.h>
69 #include <net/net_namespace.h>
73 #include <net/af_ieee802154.h>
74 #include <net/firewire.h>
76 #include <net/protocol.h>
77 #include <net/ndisc.h>
78 #include <net/ip6_route.h>
79 #include <net/addrconf.h>
82 #include <net/netlink.h>
83 #include <net/pkt_sched.h>
84 #include <net/l3mdev.h>
85 #include <linux/if_tunnel.h>
86 #include <linux/rtnetlink.h>
87 #include <linux/netconf.h>
88 #include <linux/random.h>
89 #include <linux/uaccess.h>
90 #include <asm/unaligned.h>
92 #include <linux/proc_fs.h>
93 #include <linux/seq_file.h>
94 #include <linux/export.h>
96 /* Set to 3 to get tracing... */
100 #define ADBG(fmt, ...) printk(fmt, ##__VA_ARGS__)
102 #define ADBG(fmt, ...) do { if (0) printk(fmt, ##__VA_ARGS__); } while (0)
105 #define INFINITY_LIFE_TIME 0xFFFFFFFF
107 #define IPV6_MAX_STRLEN \
108 sizeof("ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255")
110 static inline u32 cstamp_delta(unsigned long cstamp)
112 return (cstamp - INITIAL_JIFFIES) * 100UL / HZ;
116 static int addrconf_sysctl_register(struct inet6_dev *idev);
117 static void addrconf_sysctl_unregister(struct inet6_dev *idev);
119 static inline int addrconf_sysctl_register(struct inet6_dev *idev)
124 static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
129 static void __ipv6_regen_rndid(struct inet6_dev *idev);
130 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr);
131 static void ipv6_regen_rndid(unsigned long data);
133 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev);
134 static int ipv6_count_addresses(struct inet6_dev *idev);
135 static int ipv6_generate_stable_address(struct in6_addr *addr,
137 const struct inet6_dev *idev);
140 * Configured unicast address hash table
142 static struct hlist_head inet6_addr_lst[IN6_ADDR_HSIZE];
143 static DEFINE_SPINLOCK(addrconf_hash_lock);
145 static void addrconf_verify(void);
146 static void addrconf_verify_rtnl(void);
147 static void addrconf_verify_work(struct work_struct *);
149 static struct workqueue_struct *addrconf_wq;
150 static DECLARE_DELAYED_WORK(addr_chk_work, addrconf_verify_work);
152 static void addrconf_join_anycast(struct inet6_ifaddr *ifp);
153 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp);
155 static void addrconf_type_change(struct net_device *dev,
156 unsigned long event);
157 static int addrconf_ifdown(struct net_device *dev, int how);
159 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
161 const struct net_device *dev,
162 u32 flags, u32 noflags);
164 static void addrconf_dad_start(struct inet6_ifaddr *ifp);
165 static void addrconf_dad_work(struct work_struct *w);
166 static void addrconf_dad_completed(struct inet6_ifaddr *ifp);
167 static void addrconf_dad_run(struct inet6_dev *idev);
168 static void addrconf_rs_timer(unsigned long data);
169 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
170 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifa);
172 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
173 struct prefix_info *pinfo);
174 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
175 struct net_device *dev);
177 static struct ipv6_devconf ipv6_devconf __read_mostly = {
179 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
180 .mtu6 = IPV6_MIN_MTU,
182 .accept_redirects = 1,
184 .force_mld_version = 0,
185 .mldv1_unsolicited_report_interval = 10 * HZ,
186 .mldv2_unsolicited_report_interval = HZ,
188 .rtr_solicits = MAX_RTR_SOLICITATIONS,
189 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
190 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
192 .temp_valid_lft = TEMP_VALID_LIFETIME,
193 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
194 .regen_max_retry = REGEN_MAX_RETRY,
195 .max_desync_factor = MAX_DESYNC_FACTOR,
196 .max_addresses = IPV6_MAX_ADDRESSES,
197 .accept_ra_defrtr = 1,
198 .accept_ra_from_local = 0,
199 .accept_ra_min_hop_limit= 1,
200 .accept_ra_pinfo = 1,
201 #ifdef CONFIG_IPV6_ROUTER_PREF
202 .accept_ra_rtr_pref = 1,
203 .rtr_probe_interval = 60 * HZ,
204 #ifdef CONFIG_IPV6_ROUTE_INFO
205 .accept_ra_rt_info_max_plen = 0,
209 .accept_source_route = 0, /* we do not accept RH0 by default. */
212 .suppress_frag_ndisc = 1,
215 .initialized = false,
217 .use_oif_addrs_only = 0,
218 .ignore_routes_with_linkdown = 0,
221 static struct ipv6_devconf ipv6_devconf_dflt __read_mostly = {
223 .hop_limit = IPV6_DEFAULT_HOPLIMIT,
224 .mtu6 = IPV6_MIN_MTU,
226 .accept_redirects = 1,
228 .force_mld_version = 0,
229 .mldv1_unsolicited_report_interval = 10 * HZ,
230 .mldv2_unsolicited_report_interval = HZ,
232 .rtr_solicits = MAX_RTR_SOLICITATIONS,
233 .rtr_solicit_interval = RTR_SOLICITATION_INTERVAL,
234 .rtr_solicit_delay = MAX_RTR_SOLICITATION_DELAY,
236 .temp_valid_lft = TEMP_VALID_LIFETIME,
237 .temp_prefered_lft = TEMP_PREFERRED_LIFETIME,
238 .regen_max_retry = REGEN_MAX_RETRY,
239 .max_desync_factor = MAX_DESYNC_FACTOR,
240 .max_addresses = IPV6_MAX_ADDRESSES,
241 .accept_ra_defrtr = 1,
242 .accept_ra_from_local = 0,
243 .accept_ra_min_hop_limit= 1,
244 .accept_ra_pinfo = 1,
245 #ifdef CONFIG_IPV6_ROUTER_PREF
246 .accept_ra_rtr_pref = 1,
247 .rtr_probe_interval = 60 * HZ,
248 #ifdef CONFIG_IPV6_ROUTE_INFO
249 .accept_ra_rt_info_max_plen = 0,
253 .accept_source_route = 0, /* we do not accept RH0 by default. */
256 .suppress_frag_ndisc = 1,
259 .initialized = false,
261 .use_oif_addrs_only = 0,
262 .ignore_routes_with_linkdown = 0,
265 /* Check if a valid qdisc is available */
266 static inline bool addrconf_qdisc_ok(const struct net_device *dev)
268 return !qdisc_tx_is_noop(dev);
271 static void addrconf_del_rs_timer(struct inet6_dev *idev)
273 if (del_timer(&idev->rs_timer))
277 static void addrconf_del_dad_work(struct inet6_ifaddr *ifp)
279 if (cancel_delayed_work(&ifp->dad_work))
283 static void addrconf_mod_rs_timer(struct inet6_dev *idev,
286 if (!timer_pending(&idev->rs_timer))
288 mod_timer(&idev->rs_timer, jiffies + when);
291 static void addrconf_mod_dad_work(struct inet6_ifaddr *ifp,
294 if (!delayed_work_pending(&ifp->dad_work))
296 mod_delayed_work(addrconf_wq, &ifp->dad_work, delay);
299 static int snmp6_alloc_dev(struct inet6_dev *idev)
303 idev->stats.ipv6 = alloc_percpu(struct ipstats_mib);
304 if (!idev->stats.ipv6)
307 for_each_possible_cpu(i) {
308 struct ipstats_mib *addrconf_stats;
309 addrconf_stats = per_cpu_ptr(idev->stats.ipv6, i);
310 u64_stats_init(&addrconf_stats->syncp);
314 idev->stats.icmpv6dev = kzalloc(sizeof(struct icmpv6_mib_device),
316 if (!idev->stats.icmpv6dev)
318 idev->stats.icmpv6msgdev = kzalloc(sizeof(struct icmpv6msg_mib_device),
320 if (!idev->stats.icmpv6msgdev)
326 kfree(idev->stats.icmpv6dev);
328 free_percpu(idev->stats.ipv6);
333 static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
335 struct inet6_dev *ndev;
340 if (dev->mtu < IPV6_MIN_MTU)
341 return ERR_PTR(-EINVAL);
343 ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
347 rwlock_init(&ndev->lock);
349 INIT_LIST_HEAD(&ndev->addr_list);
350 setup_timer(&ndev->rs_timer, addrconf_rs_timer,
351 (unsigned long)ndev);
352 memcpy(&ndev->cnf, dev_net(dev)->ipv6.devconf_dflt, sizeof(ndev->cnf));
354 if (ndev->cnf.stable_secret.initialized)
355 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
357 ndev->addr_gen_mode = IN6_ADDR_GEN_MODE_EUI64;
359 ndev->cnf.mtu6 = dev->mtu;
360 ndev->cnf.sysctl = NULL;
361 ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
362 if (!ndev->nd_parms) {
366 if (ndev->cnf.forwarding)
367 dev_disable_lro(dev);
368 /* We refer to the device */
371 if (snmp6_alloc_dev(ndev) < 0) {
373 "%s: cannot allocate memory for statistics; dev=%s.\n",
374 __func__, dev->name);
375 neigh_parms_release(&nd_tbl, ndev->nd_parms);
381 if (snmp6_register_dev(ndev) < 0) {
383 "%s: cannot create /proc/net/dev_snmp6/%s\n",
384 __func__, dev->name);
388 /* One reference from device. We must do this before
389 * we invoke __ipv6_regen_rndid().
393 if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
394 ndev->cnf.accept_dad = -1;
396 #if IS_ENABLED(CONFIG_IPV6_SIT)
397 if (dev->type == ARPHRD_SIT && (dev->priv_flags & IFF_ISATAP)) {
398 pr_info("%s: Disabled Multicast RS\n", dev->name);
399 ndev->cnf.rtr_solicits = 0;
403 INIT_LIST_HEAD(&ndev->tempaddr_list);
404 setup_timer(&ndev->regen_timer, ipv6_regen_rndid, (unsigned long)ndev);
405 if ((dev->flags&IFF_LOOPBACK) ||
406 dev->type == ARPHRD_TUNNEL ||
407 dev->type == ARPHRD_TUNNEL6 ||
408 dev->type == ARPHRD_SIT ||
409 dev->type == ARPHRD_NONE) {
410 ndev->cnf.use_tempaddr = -1;
413 ipv6_regen_rndid((unsigned long) ndev);
416 ndev->token = in6addr_any;
418 if (netif_running(dev) && addrconf_qdisc_ok(dev))
419 ndev->if_flags |= IF_READY;
421 ipv6_mc_init_dev(ndev);
422 ndev->tstamp = jiffies;
423 err = addrconf_sysctl_register(ndev);
425 ipv6_mc_destroy_dev(ndev);
426 del_timer(&ndev->regen_timer);
427 snmp6_unregister_dev(ndev);
430 /* protected by rtnl_lock */
431 rcu_assign_pointer(dev->ip6_ptr, ndev);
433 /* Join interface-local all-node multicast group */
434 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes);
436 /* Join all-node multicast group */
437 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes);
439 /* Join all-router multicast group if forwarding is set */
440 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST))
441 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
446 neigh_parms_release(&nd_tbl, ndev->nd_parms);
448 in6_dev_finish_destroy(ndev);
452 static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
454 struct inet6_dev *idev;
458 idev = __in6_dev_get(dev);
460 idev = ipv6_add_dev(dev);
465 if (dev->flags&IFF_UP)
470 static int inet6_netconf_msgsize_devconf(int type)
472 int size = NLMSG_ALIGN(sizeof(struct netconfmsg))
473 + nla_total_size(4); /* NETCONFA_IFINDEX */
475 /* type -1 is used for ALL */
476 if (type == -1 || type == NETCONFA_FORWARDING)
477 size += nla_total_size(4);
478 #ifdef CONFIG_IPV6_MROUTE
479 if (type == -1 || type == NETCONFA_MC_FORWARDING)
480 size += nla_total_size(4);
482 if (type == -1 || type == NETCONFA_PROXY_NEIGH)
483 size += nla_total_size(4);
485 if (type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN)
486 size += nla_total_size(4);
491 static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
492 struct ipv6_devconf *devconf, u32 portid,
493 u32 seq, int event, unsigned int flags,
496 struct nlmsghdr *nlh;
497 struct netconfmsg *ncm;
499 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct netconfmsg),
504 ncm = nlmsg_data(nlh);
505 ncm->ncm_family = AF_INET6;
507 if (nla_put_s32(skb, NETCONFA_IFINDEX, ifindex) < 0)
508 goto nla_put_failure;
510 /* type -1 is used for ALL */
511 if ((type == -1 || type == NETCONFA_FORWARDING) &&
512 nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
513 goto nla_put_failure;
514 #ifdef CONFIG_IPV6_MROUTE
515 if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
516 nla_put_s32(skb, NETCONFA_MC_FORWARDING,
517 devconf->mc_forwarding) < 0)
518 goto nla_put_failure;
520 if ((type == -1 || type == NETCONFA_PROXY_NEIGH) &&
521 nla_put_s32(skb, NETCONFA_PROXY_NEIGH, devconf->proxy_ndp) < 0)
522 goto nla_put_failure;
524 if ((type == -1 || type == NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN) &&
525 nla_put_s32(skb, NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
526 devconf->ignore_routes_with_linkdown) < 0)
527 goto nla_put_failure;
533 nlmsg_cancel(skb, nlh);
537 void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
538 struct ipv6_devconf *devconf)
543 skb = nlmsg_new(inet6_netconf_msgsize_devconf(type), GFP_ATOMIC);
547 err = inet6_netconf_fill_devconf(skb, ifindex, devconf, 0, 0,
548 RTM_NEWNETCONF, 0, type);
550 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
551 WARN_ON(err == -EMSGSIZE);
555 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_NETCONF, NULL, GFP_ATOMIC);
558 rtnl_set_sk_err(net, RTNLGRP_IPV6_NETCONF, err);
561 static const struct nla_policy devconf_ipv6_policy[NETCONFA_MAX+1] = {
562 [NETCONFA_IFINDEX] = { .len = sizeof(int) },
563 [NETCONFA_FORWARDING] = { .len = sizeof(int) },
564 [NETCONFA_PROXY_NEIGH] = { .len = sizeof(int) },
565 [NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN] = { .len = sizeof(int) },
568 static int inet6_netconf_get_devconf(struct sk_buff *in_skb,
569 struct nlmsghdr *nlh)
571 struct net *net = sock_net(in_skb->sk);
572 struct nlattr *tb[NETCONFA_MAX+1];
573 struct netconfmsg *ncm;
575 struct ipv6_devconf *devconf;
576 struct inet6_dev *in6_dev;
577 struct net_device *dev;
581 err = nlmsg_parse(nlh, sizeof(*ncm), tb, NETCONFA_MAX,
582 devconf_ipv6_policy);
587 if (!tb[NETCONFA_IFINDEX])
590 ifindex = nla_get_s32(tb[NETCONFA_IFINDEX]);
592 case NETCONFA_IFINDEX_ALL:
593 devconf = net->ipv6.devconf_all;
595 case NETCONFA_IFINDEX_DEFAULT:
596 devconf = net->ipv6.devconf_dflt;
599 dev = __dev_get_by_index(net, ifindex);
602 in6_dev = __in6_dev_get(dev);
605 devconf = &in6_dev->cnf;
610 skb = nlmsg_new(inet6_netconf_msgsize_devconf(-1), GFP_ATOMIC);
614 err = inet6_netconf_fill_devconf(skb, ifindex, devconf,
615 NETLINK_CB(in_skb).portid,
616 nlh->nlmsg_seq, RTM_NEWNETCONF, 0,
619 /* -EMSGSIZE implies BUG in inet6_netconf_msgsize_devconf() */
620 WARN_ON(err == -EMSGSIZE);
624 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
629 static int inet6_netconf_dump_devconf(struct sk_buff *skb,
630 struct netlink_callback *cb)
632 struct net *net = sock_net(skb->sk);
635 struct net_device *dev;
636 struct inet6_dev *idev;
637 struct hlist_head *head;
640 s_idx = idx = cb->args[1];
642 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
644 head = &net->dev_index_head[h];
646 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^
648 hlist_for_each_entry_rcu(dev, head, index_hlist) {
651 idev = __in6_dev_get(dev);
655 if (inet6_netconf_fill_devconf(skb, dev->ifindex,
657 NETLINK_CB(cb->skb).portid,
665 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
671 if (h == NETDEV_HASHENTRIES) {
672 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_ALL,
673 net->ipv6.devconf_all,
674 NETLINK_CB(cb->skb).portid,
676 RTM_NEWNETCONF, NLM_F_MULTI,
682 if (h == NETDEV_HASHENTRIES + 1) {
683 if (inet6_netconf_fill_devconf(skb, NETCONFA_IFINDEX_DEFAULT,
684 net->ipv6.devconf_dflt,
685 NETLINK_CB(cb->skb).portid,
687 RTM_NEWNETCONF, NLM_F_MULTI,
701 static void dev_forward_change(struct inet6_dev *idev)
703 struct net_device *dev;
704 struct inet6_ifaddr *ifa;
709 if (idev->cnf.forwarding)
710 dev_disable_lro(dev);
711 if (dev->flags & IFF_MULTICAST) {
712 if (idev->cnf.forwarding) {
713 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
714 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allrouters);
715 ipv6_dev_mc_inc(dev, &in6addr_sitelocal_allrouters);
717 ipv6_dev_mc_dec(dev, &in6addr_linklocal_allrouters);
718 ipv6_dev_mc_dec(dev, &in6addr_interfacelocal_allrouters);
719 ipv6_dev_mc_dec(dev, &in6addr_sitelocal_allrouters);
723 list_for_each_entry(ifa, &idev->addr_list, if_list) {
724 if (ifa->flags&IFA_F_TENTATIVE)
726 if (idev->cnf.forwarding)
727 addrconf_join_anycast(ifa);
729 addrconf_leave_anycast(ifa);
731 inet6_netconf_notify_devconf(dev_net(dev), NETCONFA_FORWARDING,
732 dev->ifindex, &idev->cnf);
736 static void addrconf_forward_change(struct net *net, __s32 newf)
738 struct net_device *dev;
739 struct inet6_dev *idev;
741 for_each_netdev(net, dev) {
742 idev = __in6_dev_get(dev);
744 int changed = (!idev->cnf.forwarding) ^ (!newf);
745 idev->cnf.forwarding = newf;
747 dev_forward_change(idev);
752 static int addrconf_fixup_forwarding(struct ctl_table *table, int *p, int newf)
758 return restart_syscall();
760 net = (struct net *)table->extra2;
764 if (p == &net->ipv6.devconf_dflt->forwarding) {
765 if ((!newf) ^ (!old))
766 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
767 NETCONFA_IFINDEX_DEFAULT,
768 net->ipv6.devconf_dflt);
773 if (p == &net->ipv6.devconf_all->forwarding) {
774 net->ipv6.devconf_dflt->forwarding = newf;
775 addrconf_forward_change(net, newf);
776 if ((!newf) ^ (!old))
777 inet6_netconf_notify_devconf(net, NETCONFA_FORWARDING,
778 NETCONFA_IFINDEX_ALL,
779 net->ipv6.devconf_all);
780 } else if ((!newf) ^ (!old))
781 dev_forward_change((struct inet6_dev *)table->extra1);
785 rt6_purge_dflt_routers(net);
789 static void addrconf_linkdown_change(struct net *net, __s32 newf)
791 struct net_device *dev;
792 struct inet6_dev *idev;
794 for_each_netdev(net, dev) {
795 idev = __in6_dev_get(dev);
797 int changed = (!idev->cnf.ignore_routes_with_linkdown) ^ (!newf);
799 idev->cnf.ignore_routes_with_linkdown = newf;
801 inet6_netconf_notify_devconf(dev_net(dev),
802 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
809 static int addrconf_fixup_linkdown(struct ctl_table *table, int *p, int newf)
815 return restart_syscall();
817 net = (struct net *)table->extra2;
821 if (p == &net->ipv6.devconf_dflt->ignore_routes_with_linkdown) {
822 if ((!newf) ^ (!old))
823 inet6_netconf_notify_devconf(net,
824 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
825 NETCONFA_IFINDEX_DEFAULT,
826 net->ipv6.devconf_dflt);
831 if (p == &net->ipv6.devconf_all->ignore_routes_with_linkdown) {
832 net->ipv6.devconf_dflt->ignore_routes_with_linkdown = newf;
833 addrconf_linkdown_change(net, newf);
834 if ((!newf) ^ (!old))
835 inet6_netconf_notify_devconf(net,
836 NETCONFA_IGNORE_ROUTES_WITH_LINKDOWN,
837 NETCONFA_IFINDEX_ALL,
838 net->ipv6.devconf_all);
847 /* Nobody refers to this ifaddr, destroy it */
848 void inet6_ifa_finish_destroy(struct inet6_ifaddr *ifp)
850 WARN_ON(!hlist_unhashed(&ifp->addr_lst));
852 #ifdef NET_REFCNT_DEBUG
853 pr_debug("%s\n", __func__);
856 in6_dev_put(ifp->idev);
858 if (cancel_delayed_work(&ifp->dad_work))
859 pr_notice("delayed DAD work was pending while freeing ifa=%p\n",
862 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
863 pr_warn("Freeing alive inet6 address %p\n", ifp);
872 ipv6_link_dev_addr(struct inet6_dev *idev, struct inet6_ifaddr *ifp)
875 int ifp_scope = ipv6_addr_src_scope(&ifp->addr);
878 * Each device address list is sorted in order of scope -
879 * global before linklocal.
881 list_for_each(p, &idev->addr_list) {
882 struct inet6_ifaddr *ifa
883 = list_entry(p, struct inet6_ifaddr, if_list);
884 if (ifp_scope >= ipv6_addr_src_scope(&ifa->addr))
888 list_add_tail(&ifp->if_list, p);
891 static u32 inet6_addr_hash(const struct in6_addr *addr)
893 return hash_32(ipv6_addr_hash(addr), IN6_ADDR_HSIZE_SHIFT);
896 /* On success it returns ifp with increased reference count */
898 static struct inet6_ifaddr *
899 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
900 const struct in6_addr *peer_addr, int pfxlen,
901 int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
903 struct inet6_ifaddr *ifa = NULL;
907 int addr_type = ipv6_addr_type(addr);
909 if (addr_type == IPV6_ADDR_ANY ||
910 addr_type & IPV6_ADDR_MULTICAST ||
911 (!(idev->dev->flags & IFF_LOOPBACK) &&
912 addr_type & IPV6_ADDR_LOOPBACK))
913 return ERR_PTR(-EADDRNOTAVAIL);
917 err = -ENODEV; /*XXX*/
921 if (idev->cnf.disable_ipv6) {
926 spin_lock(&addrconf_hash_lock);
928 /* Ignore adding duplicate addresses on an interface */
929 if (ipv6_chk_same_addr(dev_net(idev->dev), addr, idev->dev)) {
930 ADBG("ipv6_add_addr: already assigned\n");
935 ifa = kzalloc(sizeof(struct inet6_ifaddr), GFP_ATOMIC);
938 ADBG("ipv6_add_addr: malloc failed\n");
943 rt = addrconf_dst_alloc(idev, addr, false);
949 neigh_parms_data_state_setall(idev->nd_parms);
953 ifa->peer_addr = *peer_addr;
955 spin_lock_init(&ifa->lock);
956 INIT_DELAYED_WORK(&ifa->dad_work, addrconf_dad_work);
957 INIT_HLIST_NODE(&ifa->addr_lst);
959 ifa->prefix_len = pfxlen;
960 ifa->flags = flags | IFA_F_TENTATIVE;
961 ifa->valid_lft = valid_lft;
962 ifa->prefered_lft = prefered_lft;
963 ifa->cstamp = ifa->tstamp = jiffies;
964 ifa->tokenized = false;
973 /* Add to big hash table */
974 hash = inet6_addr_hash(addr);
976 hlist_add_head_rcu(&ifa->addr_lst, &inet6_addr_lst[hash]);
977 spin_unlock(&addrconf_hash_lock);
979 write_lock(&idev->lock);
980 /* Add to inet6_dev unicast addr list. */
981 ipv6_link_dev_addr(idev, ifa);
983 if (ifa->flags&IFA_F_TEMPORARY) {
984 list_add(&ifa->tmp_list, &idev->tempaddr_list);
989 write_unlock(&idev->lock);
991 rcu_read_unlock_bh();
993 if (likely(err == 0))
994 inet6addr_notifier_call_chain(NETDEV_UP, ifa);
1002 spin_unlock(&addrconf_hash_lock);
1006 enum cleanup_prefix_rt_t {
1007 CLEANUP_PREFIX_RT_NOP, /* no cleanup action for prefix route */
1008 CLEANUP_PREFIX_RT_DEL, /* delete the prefix route */
1009 CLEANUP_PREFIX_RT_EXPIRE, /* update the lifetime of the prefix route */
1013 * Check, whether the prefix for ifp would still need a prefix route
1014 * after deleting ifp. The function returns one of the CLEANUP_PREFIX_RT_*
1017 * 1) we don't purge prefix if address was not permanent.
1018 * prefix is managed by its own lifetime.
1019 * 2) we also don't purge, if the address was IFA_F_NOPREFIXROUTE.
1020 * 3) if there are no addresses, delete prefix.
1021 * 4) if there are still other permanent address(es),
1022 * corresponding prefix is still permanent.
1023 * 5) if there are still other addresses with IFA_F_NOPREFIXROUTE,
1024 * don't purge the prefix, assume user space is managing it.
1025 * 6) otherwise, update prefix lifetime to the
1026 * longest valid lifetime among the corresponding
1027 * addresses on the device.
1028 * Note: subsequent RA will update lifetime.
1030 static enum cleanup_prefix_rt_t
1031 check_cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long *expires)
1033 struct inet6_ifaddr *ifa;
1034 struct inet6_dev *idev = ifp->idev;
1035 unsigned long lifetime;
1036 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_DEL;
1040 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1043 if (!ipv6_prefix_equal(&ifa->addr, &ifp->addr,
1046 if (ifa->flags & (IFA_F_PERMANENT | IFA_F_NOPREFIXROUTE))
1047 return CLEANUP_PREFIX_RT_NOP;
1049 action = CLEANUP_PREFIX_RT_EXPIRE;
1051 spin_lock(&ifa->lock);
1053 lifetime = addrconf_timeout_fixup(ifa->valid_lft, HZ);
1055 * Note: Because this address is
1056 * not permanent, lifetime <
1057 * LONG_MAX / HZ here.
1059 if (time_before(*expires, ifa->tstamp + lifetime * HZ))
1060 *expires = ifa->tstamp + lifetime * HZ;
1061 spin_unlock(&ifa->lock);
1068 cleanup_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, bool del_rt)
1070 struct rt6_info *rt;
1072 rt = addrconf_get_prefix_route(&ifp->addr,
1075 0, RTF_GATEWAY | RTF_DEFAULT);
1080 if (!(rt->rt6i_flags & RTF_EXPIRES))
1081 rt6_set_expires(rt, expires);
1088 /* This function wants to get referenced ifp and releases it before return */
1090 static void ipv6_del_addr(struct inet6_ifaddr *ifp)
1093 enum cleanup_prefix_rt_t action = CLEANUP_PREFIX_RT_NOP;
1094 unsigned long expires;
1098 spin_lock_bh(&ifp->lock);
1100 ifp->state = INET6_IFADDR_STATE_DEAD;
1101 spin_unlock_bh(&ifp->lock);
1103 if (state == INET6_IFADDR_STATE_DEAD)
1106 spin_lock_bh(&addrconf_hash_lock);
1107 hlist_del_init_rcu(&ifp->addr_lst);
1108 spin_unlock_bh(&addrconf_hash_lock);
1110 write_lock_bh(&ifp->idev->lock);
1112 if (ifp->flags&IFA_F_TEMPORARY) {
1113 list_del(&ifp->tmp_list);
1115 in6_ifa_put(ifp->ifpub);
1121 if (ifp->flags & IFA_F_PERMANENT && !(ifp->flags & IFA_F_NOPREFIXROUTE))
1122 action = check_cleanup_prefix_route(ifp, &expires);
1124 list_del_init(&ifp->if_list);
1127 write_unlock_bh(&ifp->idev->lock);
1129 addrconf_del_dad_work(ifp);
1131 ipv6_ifa_notify(RTM_DELADDR, ifp);
1133 inet6addr_notifier_call_chain(NETDEV_DOWN, ifp);
1135 if (action != CLEANUP_PREFIX_RT_NOP) {
1136 cleanup_prefix_route(ifp, expires,
1137 action == CLEANUP_PREFIX_RT_DEL);
1140 /* clean up prefsrc entries */
1141 rt6_remove_prefsrc(ifp);
1146 static int ipv6_create_tempaddr(struct inet6_ifaddr *ifp, struct inet6_ifaddr *ift)
1148 struct inet6_dev *idev = ifp->idev;
1149 struct in6_addr addr, *tmpaddr;
1150 unsigned long tmp_prefered_lft, tmp_valid_lft, tmp_tstamp, age;
1151 unsigned long regen_advance;
1155 unsigned long now = jiffies;
1157 write_lock_bh(&idev->lock);
1159 spin_lock_bh(&ift->lock);
1160 memcpy(&addr.s6_addr[8], &ift->addr.s6_addr[8], 8);
1161 spin_unlock_bh(&ift->lock);
1168 if (idev->cnf.use_tempaddr <= 0) {
1169 write_unlock_bh(&idev->lock);
1170 pr_info("%s: use_tempaddr is disabled\n", __func__);
1175 spin_lock_bh(&ifp->lock);
1176 if (ifp->regen_count++ >= idev->cnf.regen_max_retry) {
1177 idev->cnf.use_tempaddr = -1; /*XXX*/
1178 spin_unlock_bh(&ifp->lock);
1179 write_unlock_bh(&idev->lock);
1180 pr_warn("%s: regeneration time exceeded - disabled temporary address support\n",
1187 memcpy(addr.s6_addr, ifp->addr.s6_addr, 8);
1188 __ipv6_try_regen_rndid(idev, tmpaddr);
1189 memcpy(&addr.s6_addr[8], idev->rndid, 8);
1190 age = (now - ifp->tstamp) / HZ;
1191 tmp_valid_lft = min_t(__u32,
1193 idev->cnf.temp_valid_lft + age);
1194 tmp_prefered_lft = min_t(__u32,
1196 idev->cnf.temp_prefered_lft + age -
1197 idev->cnf.max_desync_factor);
1198 tmp_plen = ifp->prefix_len;
1199 tmp_tstamp = ifp->tstamp;
1200 spin_unlock_bh(&ifp->lock);
1202 regen_advance = idev->cnf.regen_max_retry *
1203 idev->cnf.dad_transmits *
1204 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) / HZ;
1205 write_unlock_bh(&idev->lock);
1207 /* A temporary address is created only if this calculated Preferred
1208 * Lifetime is greater than REGEN_ADVANCE time units. In particular,
1209 * an implementation must not create a temporary address with a zero
1210 * Preferred Lifetime.
1211 * Use age calculation as in addrconf_verify to avoid unnecessary
1212 * temporary addresses being generated.
1214 age = (now - tmp_tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
1215 if (tmp_prefered_lft <= regen_advance + age) {
1222 addr_flags = IFA_F_TEMPORARY;
1223 /* set in addrconf_prefix_rcv() */
1224 if (ifp->flags & IFA_F_OPTIMISTIC)
1225 addr_flags |= IFA_F_OPTIMISTIC;
1227 ift = ipv6_add_addr(idev, &addr, NULL, tmp_plen,
1228 ipv6_addr_scope(&addr), addr_flags,
1229 tmp_valid_lft, tmp_prefered_lft);
1233 pr_info("%s: retry temporary address regeneration\n", __func__);
1235 write_lock_bh(&idev->lock);
1239 spin_lock_bh(&ift->lock);
1242 ift->tstamp = tmp_tstamp;
1243 spin_unlock_bh(&ift->lock);
1245 addrconf_dad_start(ift);
1253 * Choose an appropriate source address (RFC3484)
1256 IPV6_SADDR_RULE_INIT = 0,
1257 IPV6_SADDR_RULE_LOCAL,
1258 IPV6_SADDR_RULE_SCOPE,
1259 IPV6_SADDR_RULE_PREFERRED,
1260 #ifdef CONFIG_IPV6_MIP6
1261 IPV6_SADDR_RULE_HOA,
1263 IPV6_SADDR_RULE_OIF,
1264 IPV6_SADDR_RULE_LABEL,
1265 IPV6_SADDR_RULE_PRIVACY,
1266 IPV6_SADDR_RULE_ORCHID,
1267 IPV6_SADDR_RULE_PREFIX,
1268 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1269 IPV6_SADDR_RULE_NOT_OPTIMISTIC,
1274 struct ipv6_saddr_score {
1277 struct inet6_ifaddr *ifa;
1278 DECLARE_BITMAP(scorebits, IPV6_SADDR_RULE_MAX);
1283 struct ipv6_saddr_dst {
1284 const struct in6_addr *addr;
1291 static inline int ipv6_saddr_preferred(int type)
1293 if (type & (IPV6_ADDR_MAPPED|IPV6_ADDR_COMPATv4|IPV6_ADDR_LOOPBACK))
1298 static inline bool ipv6_use_optimistic_addr(struct inet6_dev *idev)
1300 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1301 return idev && idev->cnf.optimistic_dad && idev->cnf.use_optimistic;
1307 static int ipv6_get_saddr_eval(struct net *net,
1308 struct ipv6_saddr_score *score,
1309 struct ipv6_saddr_dst *dst,
1314 if (i <= score->rule) {
1316 case IPV6_SADDR_RULE_SCOPE:
1317 ret = score->scopedist;
1319 case IPV6_SADDR_RULE_PREFIX:
1320 ret = score->matchlen;
1323 ret = !!test_bit(i, score->scorebits);
1329 case IPV6_SADDR_RULE_INIT:
1330 /* Rule 0: remember if hiscore is not ready yet */
1333 case IPV6_SADDR_RULE_LOCAL:
1334 /* Rule 1: Prefer same address */
1335 ret = ipv6_addr_equal(&score->ifa->addr, dst->addr);
1337 case IPV6_SADDR_RULE_SCOPE:
1338 /* Rule 2: Prefer appropriate scope
1343 * ---+--+-+---> scope
1345 * | d is scope of the destination.
1347 * | \ <- smaller scope is better if
1348 * B-15 | \ if scope is enough for destination.
1349 * | ret = B - scope (-1 <= scope >= d <= 15).
1351 * |/ <- greater is better
1352 * -C / if scope is not enough for destination.
1353 * /| ret = scope - C (-1 <= d < scope <= 15).
1355 * d - C - 1 < B -15 (for all -1 <= d <= 15).
1356 * C > d + 14 - B >= 15 + 14 - B = 29 - B.
1357 * Assume B = 0 and we get C > 29.
1359 ret = __ipv6_addr_src_scope(score->addr_type);
1360 if (ret >= dst->scope)
1363 ret -= 128; /* 30 is enough */
1364 score->scopedist = ret;
1366 case IPV6_SADDR_RULE_PREFERRED:
1368 /* Rule 3: Avoid deprecated and optimistic addresses */
1369 u8 avoid = IFA_F_DEPRECATED;
1371 if (!ipv6_use_optimistic_addr(score->ifa->idev))
1372 avoid |= IFA_F_OPTIMISTIC;
1373 ret = ipv6_saddr_preferred(score->addr_type) ||
1374 !(score->ifa->flags & avoid);
1377 #ifdef CONFIG_IPV6_MIP6
1378 case IPV6_SADDR_RULE_HOA:
1380 /* Rule 4: Prefer home address */
1381 int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA);
1382 ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome;
1386 case IPV6_SADDR_RULE_OIF:
1387 /* Rule 5: Prefer outgoing interface */
1388 ret = (!dst->ifindex ||
1389 dst->ifindex == score->ifa->idev->dev->ifindex);
1391 case IPV6_SADDR_RULE_LABEL:
1392 /* Rule 6: Prefer matching label */
1393 ret = ipv6_addr_label(net,
1394 &score->ifa->addr, score->addr_type,
1395 score->ifa->idev->dev->ifindex) == dst->label;
1397 case IPV6_SADDR_RULE_PRIVACY:
1399 /* Rule 7: Prefer public address
1400 * Note: prefer temporary address if use_tempaddr >= 2
1402 int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ?
1403 !!(dst->prefs & IPV6_PREFER_SRC_TMP) :
1404 score->ifa->idev->cnf.use_tempaddr >= 2;
1405 ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp;
1408 case IPV6_SADDR_RULE_ORCHID:
1409 /* Rule 8-: Prefer ORCHID vs ORCHID or
1410 * non-ORCHID vs non-ORCHID
1412 ret = !(ipv6_addr_orchid(&score->ifa->addr) ^
1413 ipv6_addr_orchid(dst->addr));
1415 case IPV6_SADDR_RULE_PREFIX:
1416 /* Rule 8: Use longest matching prefix */
1417 ret = ipv6_addr_diff(&score->ifa->addr, dst->addr);
1418 if (ret > score->ifa->prefix_len)
1419 ret = score->ifa->prefix_len;
1420 score->matchlen = ret;
1422 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
1423 case IPV6_SADDR_RULE_NOT_OPTIMISTIC:
1424 /* Optimistic addresses still have lower precedence than other
1425 * preferred addresses.
1427 ret = !(score->ifa->flags & IFA_F_OPTIMISTIC);
1435 __set_bit(i, score->scorebits);
1441 static int __ipv6_dev_get_saddr(struct net *net,
1442 struct ipv6_saddr_dst *dst,
1443 struct inet6_dev *idev,
1444 struct ipv6_saddr_score *scores,
1447 struct ipv6_saddr_score *score = &scores[1 - hiscore_idx], *hiscore = &scores[hiscore_idx];
1449 read_lock_bh(&idev->lock);
1450 list_for_each_entry(score->ifa, &idev->addr_list, if_list) {
1454 * - Tentative Address (RFC2462 section 5.4)
1455 * - A tentative address is not considered
1456 * "assigned to an interface" in the traditional
1457 * sense, unless it is also flagged as optimistic.
1458 * - Candidate Source Address (section 4)
1459 * - In any case, anycast addresses, multicast
1460 * addresses, and the unspecified address MUST
1461 * NOT be included in a candidate set.
1463 if ((score->ifa->flags & IFA_F_TENTATIVE) &&
1464 (!(score->ifa->flags & IFA_F_OPTIMISTIC)))
1467 score->addr_type = __ipv6_addr_type(&score->ifa->addr);
1469 if (unlikely(score->addr_type == IPV6_ADDR_ANY ||
1470 score->addr_type & IPV6_ADDR_MULTICAST)) {
1471 net_dbg_ratelimited("ADDRCONF: unspecified / multicast address assigned as unicast address on %s",
1477 bitmap_zero(score->scorebits, IPV6_SADDR_RULE_MAX);
1479 for (i = 0; i < IPV6_SADDR_RULE_MAX; i++) {
1480 int minihiscore, miniscore;
1482 minihiscore = ipv6_get_saddr_eval(net, hiscore, dst, i);
1483 miniscore = ipv6_get_saddr_eval(net, score, dst, i);
1485 if (minihiscore > miniscore) {
1486 if (i == IPV6_SADDR_RULE_SCOPE &&
1487 score->scopedist > 0) {
1490 * each remaining entry
1491 * has too small (not enough)
1492 * scope, because ifa entries
1493 * are sorted by their scope
1499 } else if (minihiscore < miniscore) {
1501 in6_ifa_put(hiscore->ifa);
1503 in6_ifa_hold(score->ifa);
1505 swap(hiscore, score);
1506 hiscore_idx = 1 - hiscore_idx;
1508 /* restore our iterator */
1509 score->ifa = hiscore->ifa;
1516 read_unlock_bh(&idev->lock);
1520 int ipv6_dev_get_saddr(struct net *net, const struct net_device *dst_dev,
1521 const struct in6_addr *daddr, unsigned int prefs,
1522 struct in6_addr *saddr)
1524 struct ipv6_saddr_score scores[2], *hiscore;
1525 struct ipv6_saddr_dst dst;
1526 struct inet6_dev *idev;
1527 struct net_device *dev;
1529 bool use_oif_addr = false;
1530 int hiscore_idx = 0;
1532 dst_type = __ipv6_addr_type(daddr);
1534 dst.ifindex = dst_dev ? dst_dev->ifindex : 0;
1535 dst.scope = __ipv6_addr_src_scope(dst_type);
1536 dst.label = ipv6_addr_label(net, daddr, dst_type, dst.ifindex);
1539 scores[hiscore_idx].rule = -1;
1540 scores[hiscore_idx].ifa = NULL;
1544 /* Candidate Source Address (section 4)
1545 * - multicast and link-local destination address,
1546 * the set of candidate source address MUST only
1547 * include addresses assigned to interfaces
1548 * belonging to the same link as the outgoing
1550 * (- For site-local destination addresses, the
1551 * set of candidate source addresses MUST only
1552 * include addresses assigned to interfaces
1553 * belonging to the same site as the outgoing
1555 * - "It is RECOMMENDED that the candidate source addresses
1556 * be the set of unicast addresses assigned to the
1557 * interface that will be used to send to the destination
1558 * (the 'outgoing' interface)." (RFC 6724)
1561 idev = __in6_dev_get(dst_dev);
1562 if ((dst_type & IPV6_ADDR_MULTICAST) ||
1563 dst.scope <= IPV6_ADDR_SCOPE_LINKLOCAL ||
1564 (idev && idev->cnf.use_oif_addrs_only)) {
1565 use_oif_addr = true;
1571 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1573 for_each_netdev_rcu(net, dev) {
1574 idev = __in6_dev_get(dev);
1577 hiscore_idx = __ipv6_dev_get_saddr(net, &dst, idev, scores, hiscore_idx);
1582 hiscore = &scores[hiscore_idx];
1584 return -EADDRNOTAVAIL;
1586 *saddr = hiscore->ifa->addr;
1587 in6_ifa_put(hiscore->ifa);
1590 EXPORT_SYMBOL(ipv6_dev_get_saddr);
1592 int __ipv6_get_lladdr(struct inet6_dev *idev, struct in6_addr *addr,
1595 struct inet6_ifaddr *ifp;
1596 int err = -EADDRNOTAVAIL;
1598 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
1599 if (ifp->scope > IFA_LINK)
1601 if (ifp->scope == IFA_LINK &&
1602 !(ifp->flags & banned_flags)) {
1611 int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr,
1614 struct inet6_dev *idev;
1615 int err = -EADDRNOTAVAIL;
1618 idev = __in6_dev_get(dev);
1620 read_lock_bh(&idev->lock);
1621 err = __ipv6_get_lladdr(idev, addr, banned_flags);
1622 read_unlock_bh(&idev->lock);
1628 static int ipv6_count_addresses(struct inet6_dev *idev)
1631 struct inet6_ifaddr *ifp;
1633 read_lock_bh(&idev->lock);
1634 list_for_each_entry(ifp, &idev->addr_list, if_list)
1636 read_unlock_bh(&idev->lock);
1640 int ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
1641 const struct net_device *dev, int strict)
1643 return ipv6_chk_addr_and_flags(net, addr, dev, strict, IFA_F_TENTATIVE);
1645 EXPORT_SYMBOL(ipv6_chk_addr);
1647 int ipv6_chk_addr_and_flags(struct net *net, const struct in6_addr *addr,
1648 const struct net_device *dev, int strict,
1651 struct inet6_ifaddr *ifp;
1652 unsigned int hash = inet6_addr_hash(addr);
1656 hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
1657 if (!net_eq(dev_net(ifp->idev->dev), net))
1659 /* Decouple optimistic from tentative for evaluation here.
1660 * Ban optimistic addresses explicitly, when required.
1662 ifp_flags = (ifp->flags&IFA_F_OPTIMISTIC)
1663 ? (ifp->flags&~IFA_F_TENTATIVE)
1665 if (ipv6_addr_equal(&ifp->addr, addr) &&
1666 !(ifp_flags&banned_flags) &&
1667 (!dev || ifp->idev->dev == dev ||
1668 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict))) {
1669 rcu_read_unlock_bh();
1674 rcu_read_unlock_bh();
1677 EXPORT_SYMBOL(ipv6_chk_addr_and_flags);
1679 static bool ipv6_chk_same_addr(struct net *net, const struct in6_addr *addr,
1680 struct net_device *dev)
1682 unsigned int hash = inet6_addr_hash(addr);
1683 struct inet6_ifaddr *ifp;
1685 hlist_for_each_entry(ifp, &inet6_addr_lst[hash], addr_lst) {
1686 if (!net_eq(dev_net(ifp->idev->dev), net))
1688 if (ipv6_addr_equal(&ifp->addr, addr)) {
1689 if (!dev || ifp->idev->dev == dev)
1696 /* Compares an address/prefix_len with addresses on device @dev.
1697 * If one is found it returns true.
1699 bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
1700 const unsigned int prefix_len, struct net_device *dev)
1702 struct inet6_dev *idev;
1703 struct inet6_ifaddr *ifa;
1707 idev = __in6_dev_get(dev);
1709 read_lock_bh(&idev->lock);
1710 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1711 ret = ipv6_prefix_equal(addr, &ifa->addr, prefix_len);
1715 read_unlock_bh(&idev->lock);
1721 EXPORT_SYMBOL(ipv6_chk_custom_prefix);
1723 int ipv6_chk_prefix(const struct in6_addr *addr, struct net_device *dev)
1725 struct inet6_dev *idev;
1726 struct inet6_ifaddr *ifa;
1731 idev = __in6_dev_get(dev);
1733 read_lock_bh(&idev->lock);
1734 list_for_each_entry(ifa, &idev->addr_list, if_list) {
1735 onlink = ipv6_prefix_equal(addr, &ifa->addr,
1740 read_unlock_bh(&idev->lock);
1745 EXPORT_SYMBOL(ipv6_chk_prefix);
1747 struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *addr,
1748 struct net_device *dev, int strict)
1750 struct inet6_ifaddr *ifp, *result = NULL;
1751 unsigned int hash = inet6_addr_hash(addr);
1754 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
1755 if (!net_eq(dev_net(ifp->idev->dev), net))
1757 if (ipv6_addr_equal(&ifp->addr, addr)) {
1758 if (!dev || ifp->idev->dev == dev ||
1759 !(ifp->scope&(IFA_LINK|IFA_HOST) || strict)) {
1766 rcu_read_unlock_bh();
1771 /* Gets referenced address, destroys ifaddr */
1773 static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
1775 if (ifp->flags&IFA_F_PERMANENT) {
1776 spin_lock_bh(&ifp->lock);
1777 addrconf_del_dad_work(ifp);
1778 ifp->flags |= IFA_F_TENTATIVE;
1780 ifp->flags |= IFA_F_DADFAILED;
1781 spin_unlock_bh(&ifp->lock);
1783 ipv6_ifa_notify(0, ifp);
1785 } else if (ifp->flags&IFA_F_TEMPORARY) {
1786 struct inet6_ifaddr *ifpub;
1787 spin_lock_bh(&ifp->lock);
1790 in6_ifa_hold(ifpub);
1791 spin_unlock_bh(&ifp->lock);
1792 ipv6_create_tempaddr(ifpub, ifp);
1795 spin_unlock_bh(&ifp->lock);
1803 static int addrconf_dad_end(struct inet6_ifaddr *ifp)
1807 spin_lock_bh(&ifp->lock);
1808 if (ifp->state == INET6_IFADDR_STATE_DAD) {
1809 ifp->state = INET6_IFADDR_STATE_POSTDAD;
1812 spin_unlock_bh(&ifp->lock);
1817 void addrconf_dad_failure(struct inet6_ifaddr *ifp)
1819 struct in6_addr addr;
1820 struct inet6_dev *idev = ifp->idev;
1821 struct net *net = dev_net(ifp->idev->dev);
1823 if (addrconf_dad_end(ifp)) {
1828 net_info_ratelimited("%s: IPv6 duplicate address %pI6c detected!\n",
1829 ifp->idev->dev->name, &ifp->addr);
1831 spin_lock_bh(&ifp->lock);
1833 if (ifp->flags & IFA_F_STABLE_PRIVACY) {
1834 int scope = ifp->scope;
1835 u32 flags = ifp->flags;
1836 struct in6_addr new_addr;
1837 struct inet6_ifaddr *ifp2;
1838 u32 valid_lft, preferred_lft;
1839 int pfxlen = ifp->prefix_len;
1840 int retries = ifp->stable_privacy_retry + 1;
1842 if (retries > net->ipv6.sysctl.idgen_retries) {
1843 net_info_ratelimited("%s: privacy stable address generation failed because of DAD conflicts!\n",
1844 ifp->idev->dev->name);
1848 new_addr = ifp->addr;
1849 if (ipv6_generate_stable_address(&new_addr, retries,
1853 valid_lft = ifp->valid_lft;
1854 preferred_lft = ifp->prefered_lft;
1856 spin_unlock_bh(&ifp->lock);
1858 if (idev->cnf.max_addresses &&
1859 ipv6_count_addresses(idev) >=
1860 idev->cnf.max_addresses)
1863 net_info_ratelimited("%s: generating new stable privacy address because of DAD conflict\n",
1864 ifp->idev->dev->name);
1866 ifp2 = ipv6_add_addr(idev, &new_addr, NULL, pfxlen,
1867 scope, flags, valid_lft,
1872 spin_lock_bh(&ifp2->lock);
1873 ifp2->stable_privacy_retry = retries;
1874 ifp2->state = INET6_IFADDR_STATE_PREDAD;
1875 spin_unlock_bh(&ifp2->lock);
1877 addrconf_mod_dad_work(ifp2, net->ipv6.sysctl.idgen_delay);
1880 spin_lock_bh(&ifp->lock);
1881 } else if (idev->cnf.accept_dad > 1 && !idev->cnf.disable_ipv6) {
1882 addr.s6_addr32[0] = htonl(0xfe800000);
1883 addr.s6_addr32[1] = 0;
1885 if (!ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) &&
1886 ipv6_addr_equal(&ifp->addr, &addr)) {
1887 /* DAD failed for link-local based on MAC address */
1888 idev->cnf.disable_ipv6 = 1;
1890 pr_info("%s: IPv6 being disabled!\n",
1891 ifp->idev->dev->name);
1896 /* transition from _POSTDAD to _ERRDAD */
1897 ifp->state = INET6_IFADDR_STATE_ERRDAD;
1898 spin_unlock_bh(&ifp->lock);
1900 addrconf_mod_dad_work(ifp, 0);
1904 /* Join to solicited addr multicast group.
1905 * caller must hold RTNL */
1906 void addrconf_join_solict(struct net_device *dev, const struct in6_addr *addr)
1908 struct in6_addr maddr;
1910 if (dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1913 addrconf_addr_solict_mult(addr, &maddr);
1914 ipv6_dev_mc_inc(dev, &maddr);
1917 /* caller must hold RTNL */
1918 void addrconf_leave_solict(struct inet6_dev *idev, const struct in6_addr *addr)
1920 struct in6_addr maddr;
1922 if (idev->dev->flags&(IFF_LOOPBACK|IFF_NOARP))
1925 addrconf_addr_solict_mult(addr, &maddr);
1926 __ipv6_dev_mc_dec(idev, &maddr);
1929 /* caller must hold RTNL */
1930 static void addrconf_join_anycast(struct inet6_ifaddr *ifp)
1932 struct in6_addr addr;
1934 if (ifp->prefix_len >= 127) /* RFC 6164 */
1936 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1937 if (ipv6_addr_any(&addr))
1939 __ipv6_dev_ac_inc(ifp->idev, &addr);
1942 /* caller must hold RTNL */
1943 static void addrconf_leave_anycast(struct inet6_ifaddr *ifp)
1945 struct in6_addr addr;
1947 if (ifp->prefix_len >= 127) /* RFC 6164 */
1949 ipv6_addr_prefix(&addr, &ifp->addr, ifp->prefix_len);
1950 if (ipv6_addr_any(&addr))
1952 __ipv6_dev_ac_dec(ifp->idev, &addr);
1955 static int addrconf_ifid_eui64(u8 *eui, struct net_device *dev)
1957 if (dev->addr_len != IEEE802154_ADDR_LEN)
1959 memcpy(eui, dev->dev_addr, 8);
1964 static int addrconf_ifid_ieee1394(u8 *eui, struct net_device *dev)
1966 union fwnet_hwaddr *ha;
1968 if (dev->addr_len != FWNET_ALEN)
1971 ha = (union fwnet_hwaddr *)dev->dev_addr;
1973 memcpy(eui, &ha->uc.uniq_id, sizeof(ha->uc.uniq_id));
1978 static int addrconf_ifid_arcnet(u8 *eui, struct net_device *dev)
1980 /* XXX: inherit EUI-64 from other interface -- yoshfuji */
1981 if (dev->addr_len != ARCNET_ALEN)
1984 eui[7] = *(u8 *)dev->dev_addr;
1988 static int addrconf_ifid_infiniband(u8 *eui, struct net_device *dev)
1990 if (dev->addr_len != INFINIBAND_ALEN)
1992 memcpy(eui, dev->dev_addr + 12, 8);
1997 static int __ipv6_isatap_ifid(u8 *eui, __be32 addr)
2001 eui[0] = (ipv4_is_zeronet(addr) || ipv4_is_private_10(addr) ||
2002 ipv4_is_loopback(addr) || ipv4_is_linklocal_169(addr) ||
2003 ipv4_is_private_172(addr) || ipv4_is_test_192(addr) ||
2004 ipv4_is_anycast_6to4(addr) || ipv4_is_private_192(addr) ||
2005 ipv4_is_test_198(addr) || ipv4_is_multicast(addr) ||
2006 ipv4_is_lbcast(addr)) ? 0x00 : 0x02;
2010 memcpy(eui + 4, &addr, 4);
2014 static int addrconf_ifid_sit(u8 *eui, struct net_device *dev)
2016 if (dev->priv_flags & IFF_ISATAP)
2017 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2021 static int addrconf_ifid_gre(u8 *eui, struct net_device *dev)
2023 return __ipv6_isatap_ifid(eui, *(__be32 *)dev->dev_addr);
2026 static int addrconf_ifid_ip6tnl(u8 *eui, struct net_device *dev)
2028 memcpy(eui, dev->perm_addr, 3);
2029 memcpy(eui + 5, dev->perm_addr + 3, 3);
2036 static int ipv6_generate_eui64(u8 *eui, struct net_device *dev)
2038 switch (dev->type) {
2041 return addrconf_ifid_eui48(eui, dev);
2043 return addrconf_ifid_arcnet(eui, dev);
2044 case ARPHRD_INFINIBAND:
2045 return addrconf_ifid_infiniband(eui, dev);
2047 return addrconf_ifid_sit(eui, dev);
2049 return addrconf_ifid_gre(eui, dev);
2050 case ARPHRD_6LOWPAN:
2051 case ARPHRD_IEEE802154:
2052 return addrconf_ifid_eui64(eui, dev);
2053 case ARPHRD_IEEE1394:
2054 return addrconf_ifid_ieee1394(eui, dev);
2055 case ARPHRD_TUNNEL6:
2056 return addrconf_ifid_ip6tnl(eui, dev);
2061 static int ipv6_inherit_eui64(u8 *eui, struct inet6_dev *idev)
2064 struct inet6_ifaddr *ifp;
2066 read_lock_bh(&idev->lock);
2067 list_for_each_entry_reverse(ifp, &idev->addr_list, if_list) {
2068 if (ifp->scope > IFA_LINK)
2070 if (ifp->scope == IFA_LINK && !(ifp->flags&IFA_F_TENTATIVE)) {
2071 memcpy(eui, ifp->addr.s6_addr+8, 8);
2076 read_unlock_bh(&idev->lock);
2080 /* (re)generation of randomized interface identifier (RFC 3041 3.2, 3.5) */
2081 static void __ipv6_regen_rndid(struct inet6_dev *idev)
2084 get_random_bytes(idev->rndid, sizeof(idev->rndid));
2085 idev->rndid[0] &= ~0x02;
2088 * <draft-ietf-ipngwg-temp-addresses-v2-00.txt>:
2089 * check if generated address is not inappropriate
2091 * - Reserved subnet anycast (RFC 2526)
2092 * 11111101 11....11 1xxxxxxx
2093 * - ISATAP (RFC4214) 6.1
2094 * 00-00-5E-FE-xx-xx-xx-xx
2096 * - XXX: already assigned to an address on the device
2098 if (idev->rndid[0] == 0xfd &&
2099 (idev->rndid[1]&idev->rndid[2]&idev->rndid[3]&idev->rndid[4]&idev->rndid[5]&idev->rndid[6]) == 0xff &&
2100 (idev->rndid[7]&0x80))
2102 if ((idev->rndid[0]|idev->rndid[1]) == 0) {
2103 if (idev->rndid[2] == 0x5e && idev->rndid[3] == 0xfe)
2105 if ((idev->rndid[2]|idev->rndid[3]|idev->rndid[4]|idev->rndid[5]|idev->rndid[6]|idev->rndid[7]) == 0x00)
2110 static void ipv6_regen_rndid(unsigned long data)
2112 struct inet6_dev *idev = (struct inet6_dev *) data;
2113 unsigned long expires;
2116 write_lock_bh(&idev->lock);
2121 __ipv6_regen_rndid(idev);
2124 idev->cnf.temp_prefered_lft * HZ -
2125 idev->cnf.regen_max_retry * idev->cnf.dad_transmits *
2126 NEIGH_VAR(idev->nd_parms, RETRANS_TIME) -
2127 idev->cnf.max_desync_factor * HZ;
2128 if (time_before(expires, jiffies)) {
2129 pr_warn("%s: too short regeneration interval; timer disabled for %s\n",
2130 __func__, idev->dev->name);
2134 if (!mod_timer(&idev->regen_timer, expires))
2138 write_unlock_bh(&idev->lock);
2139 rcu_read_unlock_bh();
2143 static void __ipv6_try_regen_rndid(struct inet6_dev *idev, struct in6_addr *tmpaddr)
2145 if (tmpaddr && memcmp(idev->rndid, &tmpaddr->s6_addr[8], 8) == 0)
2146 __ipv6_regen_rndid(idev);
2154 addrconf_prefix_route(struct in6_addr *pfx, int plen, struct net_device *dev,
2155 unsigned long expires, u32 flags)
2157 struct fib6_config cfg = {
2158 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX,
2159 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2160 .fc_ifindex = dev->ifindex,
2161 .fc_expires = expires,
2163 .fc_flags = RTF_UP | flags,
2164 .fc_nlinfo.nl_net = dev_net(dev),
2165 .fc_protocol = RTPROT_KERNEL,
2170 /* Prevent useless cloning on PtP SIT.
2171 This thing is done here expecting that the whole
2172 class of non-broadcast devices need not cloning.
2174 #if IS_ENABLED(CONFIG_IPV6_SIT)
2175 if (dev->type == ARPHRD_SIT && (dev->flags & IFF_POINTOPOINT))
2176 cfg.fc_flags |= RTF_NONEXTHOP;
2179 ip6_route_add(&cfg);
2183 static struct rt6_info *addrconf_get_prefix_route(const struct in6_addr *pfx,
2185 const struct net_device *dev,
2186 u32 flags, u32 noflags)
2188 struct fib6_node *fn;
2189 struct rt6_info *rt = NULL;
2190 struct fib6_table *table;
2191 u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_PREFIX;
2193 table = fib6_get_table(dev_net(dev), tb_id);
2197 read_lock_bh(&table->tb6_lock);
2198 fn = fib6_locate(&table->tb6_root, pfx, plen, NULL, 0);
2202 noflags |= RTF_CACHE;
2203 for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
2204 if (rt->dst.dev->ifindex != dev->ifindex)
2206 if ((rt->rt6i_flags & flags) != flags)
2208 if ((rt->rt6i_flags & noflags) != 0)
2214 read_unlock_bh(&table->tb6_lock);
2219 /* Create "default" multicast route to the interface */
2221 static void addrconf_add_mroute(struct net_device *dev)
2223 struct fib6_config cfg = {
2224 .fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_LOCAL,
2225 .fc_metric = IP6_RT_PRIO_ADDRCONF,
2226 .fc_ifindex = dev->ifindex,
2229 .fc_nlinfo.nl_net = dev_net(dev),
2232 ipv6_addr_set(&cfg.fc_dst, htonl(0xFF000000), 0, 0, 0);
2234 ip6_route_add(&cfg);
2237 static struct inet6_dev *addrconf_add_dev(struct net_device *dev)
2239 struct inet6_dev *idev;
2243 idev = ipv6_find_idev(dev);
2245 return ERR_PTR(-ENOBUFS);
2247 if (idev->cnf.disable_ipv6)
2248 return ERR_PTR(-EACCES);
2250 /* Add default multicast route */
2251 if (!(dev->flags & IFF_LOOPBACK))
2252 addrconf_add_mroute(dev);
2257 static void manage_tempaddrs(struct inet6_dev *idev,
2258 struct inet6_ifaddr *ifp,
2259 __u32 valid_lft, __u32 prefered_lft,
2260 bool create, unsigned long now)
2263 struct inet6_ifaddr *ift;
2265 read_lock_bh(&idev->lock);
2266 /* update all temporary addresses in the list */
2267 list_for_each_entry(ift, &idev->tempaddr_list, tmp_list) {
2268 int age, max_valid, max_prefered;
2270 if (ifp != ift->ifpub)
2273 /* RFC 4941 section 3.3:
2274 * If a received option will extend the lifetime of a public
2275 * address, the lifetimes of temporary addresses should
2276 * be extended, subject to the overall constraint that no
2277 * temporary addresses should ever remain "valid" or "preferred"
2278 * for a time longer than (TEMP_VALID_LIFETIME) or
2279 * (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR), respectively.
2281 age = (now - ift->cstamp) / HZ;
2282 max_valid = idev->cnf.temp_valid_lft - age;
2286 max_prefered = idev->cnf.temp_prefered_lft -
2287 idev->cnf.max_desync_factor - age;
2288 if (max_prefered < 0)
2291 if (valid_lft > max_valid)
2292 valid_lft = max_valid;
2294 if (prefered_lft > max_prefered)
2295 prefered_lft = max_prefered;
2297 spin_lock(&ift->lock);
2299 ift->valid_lft = valid_lft;
2300 ift->prefered_lft = prefered_lft;
2302 if (prefered_lft > 0)
2303 ift->flags &= ~IFA_F_DEPRECATED;
2305 spin_unlock(&ift->lock);
2306 if (!(flags&IFA_F_TENTATIVE))
2307 ipv6_ifa_notify(0, ift);
2310 if ((create || list_empty(&idev->tempaddr_list)) &&
2311 idev->cnf.use_tempaddr > 0) {
2312 /* When a new public address is created as described
2313 * in [ADDRCONF], also create a new temporary address.
2314 * Also create a temporary address if it's enabled but
2315 * no temporary address currently exists.
2317 read_unlock_bh(&idev->lock);
2318 ipv6_create_tempaddr(ifp, NULL);
2320 read_unlock_bh(&idev->lock);
2324 void addrconf_prefix_rcv(struct net_device *dev, u8 *opt, int len, bool sllao)
2326 struct prefix_info *pinfo;
2331 struct inet6_dev *in6_dev;
2332 struct net *net = dev_net(dev);
2334 pinfo = (struct prefix_info *) opt;
2336 if (len < sizeof(struct prefix_info)) {
2337 ADBG("addrconf: prefix option too short\n");
2342 * Validation checks ([ADDRCONF], page 19)
2345 addr_type = ipv6_addr_type(&pinfo->prefix);
2347 if (addr_type & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL))
2350 valid_lft = ntohl(pinfo->valid);
2351 prefered_lft = ntohl(pinfo->prefered);
2353 if (prefered_lft > valid_lft) {
2354 net_warn_ratelimited("addrconf: prefix option has invalid lifetime\n");
2358 in6_dev = in6_dev_get(dev);
2361 net_dbg_ratelimited("addrconf: device %s not configured\n",
2367 * Two things going on here:
2368 * 1) Add routes for on-link prefixes
2369 * 2) Configure prefixes with the auto flag set
2372 if (pinfo->onlink) {
2373 struct rt6_info *rt;
2374 unsigned long rt_expires;
2376 /* Avoid arithmetic overflow. Really, we could
2377 * save rt_expires in seconds, likely valid_lft,
2378 * but it would require division in fib gc, that it
2382 rt_expires = addrconf_timeout_fixup(valid_lft, HZ);
2384 rt_expires = addrconf_timeout_fixup(valid_lft, USER_HZ);
2386 if (addrconf_finite_timeout(rt_expires))
2389 rt = addrconf_get_prefix_route(&pinfo->prefix,
2392 RTF_ADDRCONF | RTF_PREFIX_RT,
2393 RTF_GATEWAY | RTF_DEFAULT);
2396 /* Autoconf prefix route */
2397 if (valid_lft == 0) {
2400 } else if (addrconf_finite_timeout(rt_expires)) {
2402 rt6_set_expires(rt, jiffies + rt_expires);
2404 rt6_clean_expires(rt);
2406 } else if (valid_lft) {
2407 clock_t expires = 0;
2408 int flags = RTF_ADDRCONF | RTF_PREFIX_RT;
2409 if (addrconf_finite_timeout(rt_expires)) {
2411 flags |= RTF_EXPIRES;
2412 expires = jiffies_to_clock_t(rt_expires);
2414 addrconf_prefix_route(&pinfo->prefix, pinfo->prefix_len,
2415 dev, expires, flags);
2420 /* Try to figure out our local address for this prefix */
2422 if (pinfo->autoconf && in6_dev->cnf.autoconf) {
2423 struct inet6_ifaddr *ifp;
2424 struct in6_addr addr;
2425 int create = 0, update_lft = 0;
2426 bool tokenized = false;
2428 if (pinfo->prefix_len == 64) {
2429 memcpy(&addr, &pinfo->prefix, 8);
2431 if (!ipv6_addr_any(&in6_dev->token)) {
2432 read_lock_bh(&in6_dev->lock);
2433 memcpy(addr.s6_addr + 8,
2434 in6_dev->token.s6_addr + 8, 8);
2435 read_unlock_bh(&in6_dev->lock);
2437 } else if (in6_dev->addr_gen_mode ==
2438 IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
2439 !ipv6_generate_stable_address(&addr, 0,
2441 addr_flags |= IFA_F_STABLE_PRIVACY;
2443 } else if (ipv6_generate_eui64(addr.s6_addr + 8, dev) &&
2444 ipv6_inherit_eui64(addr.s6_addr + 8, in6_dev)) {
2445 in6_dev_put(in6_dev);
2450 net_dbg_ratelimited("IPv6 addrconf: prefix with wrong length %d\n",
2452 in6_dev_put(in6_dev);
2457 ifp = ipv6_get_ifaddr(net, &addr, dev, 1);
2459 if (!ifp && valid_lft) {
2460 int max_addresses = in6_dev->cnf.max_addresses;
2462 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2463 if (in6_dev->cnf.optimistic_dad &&
2464 !net->ipv6.devconf_all->forwarding && sllao)
2465 addr_flags |= IFA_F_OPTIMISTIC;
2468 /* Do not allow to create too much of autoconfigured
2469 * addresses; this would be too easy way to crash kernel.
2471 if (!max_addresses ||
2472 ipv6_count_addresses(in6_dev) < max_addresses)
2473 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
2475 addr_type&IPV6_ADDR_SCOPE_MASK,
2476 addr_flags, valid_lft,
2479 if (IS_ERR_OR_NULL(ifp)) {
2480 in6_dev_put(in6_dev);
2486 spin_lock_bh(&ifp->lock);
2487 ifp->flags |= IFA_F_MANAGETEMPADDR;
2488 ifp->cstamp = jiffies;
2489 ifp->tokenized = tokenized;
2490 spin_unlock_bh(&ifp->lock);
2491 addrconf_dad_start(ifp);
2499 /* update lifetime (RFC2462 5.5.3 e) */
2500 spin_lock_bh(&ifp->lock);
2502 if (ifp->valid_lft > (now - ifp->tstamp) / HZ)
2503 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
2506 if (!update_lft && !create && stored_lft) {
2507 const u32 minimum_lft = min_t(u32,
2508 stored_lft, MIN_VALID_LIFETIME);
2509 valid_lft = max(valid_lft, minimum_lft);
2511 /* RFC4862 Section 5.5.3e:
2512 * "Note that the preferred lifetime of the
2513 * corresponding address is always reset to
2514 * the Preferred Lifetime in the received
2515 * Prefix Information option, regardless of
2516 * whether the valid lifetime is also reset or
2519 * So we should always update prefered_lft here.
2525 ifp->valid_lft = valid_lft;
2526 ifp->prefered_lft = prefered_lft;
2529 ifp->flags &= ~IFA_F_DEPRECATED;
2530 spin_unlock_bh(&ifp->lock);
2532 if (!(flags&IFA_F_TENTATIVE))
2533 ipv6_ifa_notify(0, ifp);
2535 spin_unlock_bh(&ifp->lock);
2537 manage_tempaddrs(in6_dev, ifp, valid_lft, prefered_lft,
2544 inet6_prefix_notify(RTM_NEWPREFIX, in6_dev, pinfo);
2545 in6_dev_put(in6_dev);
2549 * Set destination address.
2550 * Special case for SIT interfaces where we create a new "virtual"
2553 int addrconf_set_dstaddr(struct net *net, void __user *arg)
2555 struct in6_ifreq ireq;
2556 struct net_device *dev;
2562 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2565 dev = __dev_get_by_index(net, ireq.ifr6_ifindex);
2571 #if IS_ENABLED(CONFIG_IPV6_SIT)
2572 if (dev->type == ARPHRD_SIT) {
2573 const struct net_device_ops *ops = dev->netdev_ops;
2575 struct ip_tunnel_parm p;
2577 err = -EADDRNOTAVAIL;
2578 if (!(ipv6_addr_type(&ireq.ifr6_addr) & IPV6_ADDR_COMPATv4))
2581 memset(&p, 0, sizeof(p));
2582 p.iph.daddr = ireq.ifr6_addr.s6_addr32[3];
2586 p.iph.protocol = IPPROTO_IPV6;
2588 ifr.ifr_ifru.ifru_data = (__force void __user *)&p;
2590 if (ops->ndo_do_ioctl) {
2591 mm_segment_t oldfs = get_fs();
2594 err = ops->ndo_do_ioctl(dev, &ifr, SIOCADDTUNNEL);
2601 dev = __dev_get_by_name(net, p.name);
2604 err = dev_open(dev);
2614 static int ipv6_mc_config(struct sock *sk, bool join,
2615 const struct in6_addr *addr, int ifindex)
2623 ret = ipv6_sock_mc_join(sk, ifindex, addr);
2625 ret = ipv6_sock_mc_drop(sk, ifindex, addr);
2632 * Manual configuration of address on an interface
2634 static int inet6_addr_add(struct net *net, int ifindex,
2635 const struct in6_addr *pfx,
2636 const struct in6_addr *peer_pfx,
2637 unsigned int plen, __u32 ifa_flags,
2638 __u32 prefered_lft, __u32 valid_lft)
2640 struct inet6_ifaddr *ifp;
2641 struct inet6_dev *idev;
2642 struct net_device *dev;
2643 unsigned long timeout;
2653 /* check the lifetime */
2654 if (!valid_lft || prefered_lft > valid_lft)
2657 if (ifa_flags & IFA_F_MANAGETEMPADDR && plen != 64)
2660 dev = __dev_get_by_index(net, ifindex);
2664 idev = addrconf_add_dev(dev);
2666 return PTR_ERR(idev);
2668 if (ifa_flags & IFA_F_MCAUTOJOIN) {
2669 int ret = ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2670 true, pfx, ifindex);
2676 scope = ipv6_addr_scope(pfx);
2678 timeout = addrconf_timeout_fixup(valid_lft, HZ);
2679 if (addrconf_finite_timeout(timeout)) {
2680 expires = jiffies_to_clock_t(timeout * HZ);
2681 valid_lft = timeout;
2682 flags = RTF_EXPIRES;
2686 ifa_flags |= IFA_F_PERMANENT;
2689 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
2690 if (addrconf_finite_timeout(timeout)) {
2692 ifa_flags |= IFA_F_DEPRECATED;
2693 prefered_lft = timeout;
2696 ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
2697 valid_lft, prefered_lft);
2700 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
2701 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
2706 * Note that section 3.1 of RFC 4429 indicates
2707 * that the Optimistic flag should not be set for
2708 * manually configured addresses
2710 addrconf_dad_start(ifp);
2711 if (ifa_flags & IFA_F_MANAGETEMPADDR)
2712 manage_tempaddrs(idev, ifp, valid_lft, prefered_lft,
2715 addrconf_verify_rtnl();
2717 } else if (ifa_flags & IFA_F_MCAUTOJOIN) {
2718 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2719 false, pfx, ifindex);
2722 return PTR_ERR(ifp);
2725 static int inet6_addr_del(struct net *net, int ifindex, u32 ifa_flags,
2726 const struct in6_addr *pfx, unsigned int plen)
2728 struct inet6_ifaddr *ifp;
2729 struct inet6_dev *idev;
2730 struct net_device *dev;
2735 dev = __dev_get_by_index(net, ifindex);
2739 idev = __in6_dev_get(dev);
2743 read_lock_bh(&idev->lock);
2744 list_for_each_entry(ifp, &idev->addr_list, if_list) {
2745 if (ifp->prefix_len == plen &&
2746 ipv6_addr_equal(pfx, &ifp->addr)) {
2748 read_unlock_bh(&idev->lock);
2750 if (!(ifp->flags & IFA_F_TEMPORARY) &&
2751 (ifa_flags & IFA_F_MANAGETEMPADDR))
2752 manage_tempaddrs(idev, ifp, 0, 0, false,
2755 addrconf_verify_rtnl();
2756 if (ipv6_addr_is_multicast(pfx)) {
2757 ipv6_mc_config(net->ipv6.mc_autojoin_sk,
2758 false, pfx, dev->ifindex);
2763 read_unlock_bh(&idev->lock);
2764 return -EADDRNOTAVAIL;
2768 int addrconf_add_ifaddr(struct net *net, void __user *arg)
2770 struct in6_ifreq ireq;
2773 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2776 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2780 err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
2781 ireq.ifr6_prefixlen, IFA_F_PERMANENT,
2782 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2787 int addrconf_del_ifaddr(struct net *net, void __user *arg)
2789 struct in6_ifreq ireq;
2792 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
2795 if (copy_from_user(&ireq, arg, sizeof(struct in6_ifreq)))
2799 err = inet6_addr_del(net, ireq.ifr6_ifindex, 0, &ireq.ifr6_addr,
2800 ireq.ifr6_prefixlen);
2805 static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
2806 int plen, int scope)
2808 struct inet6_ifaddr *ifp;
2810 ifp = ipv6_add_addr(idev, addr, NULL, plen,
2811 scope, IFA_F_PERMANENT,
2812 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2814 spin_lock_bh(&ifp->lock);
2815 ifp->flags &= ~IFA_F_TENTATIVE;
2816 spin_unlock_bh(&ifp->lock);
2817 ipv6_ifa_notify(RTM_NEWADDR, ifp);
2822 #if IS_ENABLED(CONFIG_IPV6_SIT)
2823 static void sit_add_v4_addrs(struct inet6_dev *idev)
2825 struct in6_addr addr;
2826 struct net_device *dev;
2827 struct net *net = dev_net(idev->dev);
2833 memset(&addr, 0, sizeof(struct in6_addr));
2834 memcpy(&addr.s6_addr32[3], idev->dev->dev_addr, 4);
2836 if (idev->dev->flags&IFF_POINTOPOINT) {
2837 addr.s6_addr32[0] = htonl(0xfe800000);
2841 scope = IPV6_ADDR_COMPATv4;
2843 pflags |= RTF_NONEXTHOP;
2846 if (addr.s6_addr32[3]) {
2847 add_addr(idev, &addr, plen, scope);
2848 addrconf_prefix_route(&addr, plen, idev->dev, 0, pflags);
2852 for_each_netdev(net, dev) {
2853 struct in_device *in_dev = __in_dev_get_rtnl(dev);
2854 if (in_dev && (dev->flags & IFF_UP)) {
2855 struct in_ifaddr *ifa;
2859 for (ifa = in_dev->ifa_list; ifa; ifa = ifa->ifa_next) {
2861 addr.s6_addr32[3] = ifa->ifa_local;
2863 if (ifa->ifa_scope == RT_SCOPE_LINK)
2865 if (ifa->ifa_scope >= RT_SCOPE_HOST) {
2866 if (idev->dev->flags&IFF_POINTOPOINT)
2871 add_addr(idev, &addr, plen, flag);
2872 addrconf_prefix_route(&addr, plen, idev->dev, 0,
2880 static void init_loopback(struct net_device *dev)
2882 struct inet6_dev *idev;
2883 struct net_device *sp_dev;
2884 struct inet6_ifaddr *sp_ifa;
2885 struct rt6_info *sp_rt;
2891 idev = ipv6_find_idev(dev);
2893 pr_debug("%s: add_dev failed\n", __func__);
2897 add_addr(idev, &in6addr_loopback, 128, IFA_HOST);
2899 /* Add routes to other interface's IPv6 addresses */
2900 for_each_netdev(dev_net(dev), sp_dev) {
2901 if (!strcmp(sp_dev->name, dev->name))
2904 idev = __in6_dev_get(sp_dev);
2908 read_lock_bh(&idev->lock);
2909 list_for_each_entry(sp_ifa, &idev->addr_list, if_list) {
2911 if (sp_ifa->flags & (IFA_F_DADFAILED | IFA_F_TENTATIVE))
2915 /* This dst has been added to garbage list when
2916 * lo device down, release this obsolete dst and
2917 * reallocate a new router for ifa.
2919 if (!atomic_read(&sp_ifa->rt->rt6i_ref)) {
2920 ip6_rt_put(sp_ifa->rt);
2927 sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, false);
2929 /* Failure cases are ignored */
2930 if (!IS_ERR(sp_rt)) {
2935 read_unlock_bh(&idev->lock);
2939 static void addrconf_add_linklocal(struct inet6_dev *idev,
2940 const struct in6_addr *addr, u32 flags)
2942 struct inet6_ifaddr *ifp;
2943 u32 addr_flags = flags | IFA_F_PERMANENT;
2945 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
2946 if (idev->cnf.optimistic_dad &&
2947 !dev_net(idev->dev)->ipv6.devconf_all->forwarding)
2948 addr_flags |= IFA_F_OPTIMISTIC;
2951 ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags,
2952 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
2954 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
2955 addrconf_dad_start(ifp);
2960 static bool ipv6_reserved_interfaceid(struct in6_addr address)
2962 if ((address.s6_addr32[2] | address.s6_addr32[3]) == 0)
2965 if (address.s6_addr32[2] == htonl(0x02005eff) &&
2966 ((address.s6_addr32[3] & htonl(0xfe000000)) == htonl(0xfe000000)))
2969 if (address.s6_addr32[2] == htonl(0xfdffffff) &&
2970 ((address.s6_addr32[3] & htonl(0xffffff80)) == htonl(0xffffff80)))
2976 static int ipv6_generate_stable_address(struct in6_addr *address,
2978 const struct inet6_dev *idev)
2980 static DEFINE_SPINLOCK(lock);
2981 static __u32 digest[SHA_DIGEST_WORDS];
2982 static __u32 workspace[SHA_WORKSPACE_WORDS];
2985 char __data[SHA_MESSAGE_BYTES];
2987 struct in6_addr secret;
2989 unsigned char hwaddr[MAX_ADDR_LEN];
2994 struct in6_addr secret;
2995 struct in6_addr temp;
2996 struct net *net = dev_net(idev->dev);
2998 BUILD_BUG_ON(sizeof(data.__data) != sizeof(data));
3000 if (idev->cnf.stable_secret.initialized)
3001 secret = idev->cnf.stable_secret.secret;
3002 else if (net->ipv6.devconf_dflt->stable_secret.initialized)
3003 secret = net->ipv6.devconf_dflt->stable_secret.secret;
3008 spin_lock_bh(&lock);
3011 memset(&data, 0, sizeof(data));
3012 memset(workspace, 0, sizeof(workspace));
3013 memcpy(data.hwaddr, idev->dev->perm_addr, idev->dev->addr_len);
3014 data.prefix[0] = address->s6_addr32[0];
3015 data.prefix[1] = address->s6_addr32[1];
3016 data.secret = secret;
3017 data.dad_count = dad_count;
3019 sha_transform(digest, data.__data, workspace);
3022 temp.s6_addr32[2] = (__force __be32)digest[0];
3023 temp.s6_addr32[3] = (__force __be32)digest[1];
3025 spin_unlock_bh(&lock);
3027 if (ipv6_reserved_interfaceid(temp)) {
3029 if (dad_count > dev_net(idev->dev)->ipv6.sysctl.idgen_retries)
3038 static void addrconf_addr_gen(struct inet6_dev *idev, bool prefix_route)
3040 struct in6_addr addr;
3042 /* no link local addresses on L3 master devices */
3043 if (netif_is_l3_master(idev->dev))
3046 ipv6_addr_set(&addr, htonl(0xFE800000), 0, 0, 0);
3048 if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY) {
3049 if (!ipv6_generate_stable_address(&addr, 0, idev))
3050 addrconf_add_linklocal(idev, &addr,
3051 IFA_F_STABLE_PRIVACY);
3052 else if (prefix_route)
3053 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3054 } else if (idev->addr_gen_mode == IN6_ADDR_GEN_MODE_EUI64) {
3055 /* addrconf_add_linklocal also adds a prefix_route and we
3056 * only need to care about prefix routes if ipv6_generate_eui64
3057 * couldn't generate one.
3059 if (ipv6_generate_eui64(addr.s6_addr + 8, idev->dev) == 0)
3060 addrconf_add_linklocal(idev, &addr, 0);
3061 else if (prefix_route)
3062 addrconf_prefix_route(&addr, 64, idev->dev, 0, 0);
3066 static void addrconf_dev_config(struct net_device *dev)
3068 struct inet6_dev *idev;
3072 if ((dev->type != ARPHRD_ETHER) &&
3073 (dev->type != ARPHRD_FDDI) &&
3074 (dev->type != ARPHRD_ARCNET) &&
3075 (dev->type != ARPHRD_INFINIBAND) &&
3076 (dev->type != ARPHRD_IEEE802154) &&
3077 (dev->type != ARPHRD_IEEE1394) &&
3078 (dev->type != ARPHRD_TUNNEL6) &&
3079 (dev->type != ARPHRD_6LOWPAN)) {
3080 /* Alas, we support only Ethernet autoconfiguration. */
3084 idev = addrconf_add_dev(dev);
3088 addrconf_addr_gen(idev, false);
3091 #if IS_ENABLED(CONFIG_IPV6_SIT)
3092 static void addrconf_sit_config(struct net_device *dev)
3094 struct inet6_dev *idev;
3099 * Configure the tunnel with one of our IPv4
3100 * addresses... we should configure all of
3101 * our v4 addrs in the tunnel
3104 idev = ipv6_find_idev(dev);
3106 pr_debug("%s: add_dev failed\n", __func__);
3110 if (dev->priv_flags & IFF_ISATAP) {
3111 addrconf_addr_gen(idev, false);
3115 sit_add_v4_addrs(idev);
3117 if (dev->flags&IFF_POINTOPOINT)
3118 addrconf_add_mroute(dev);
3122 #if IS_ENABLED(CONFIG_NET_IPGRE)
3123 static void addrconf_gre_config(struct net_device *dev)
3125 struct inet6_dev *idev;
3129 idev = ipv6_find_idev(dev);
3131 pr_debug("%s: add_dev failed\n", __func__);
3135 addrconf_addr_gen(idev, true);
3136 if (dev->flags & IFF_POINTOPOINT)
3137 addrconf_add_mroute(dev);
3141 static int addrconf_notify(struct notifier_block *this, unsigned long event,
3144 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3145 struct inet6_dev *idev = __in6_dev_get(dev);
3146 int run_pending = 0;
3150 case NETDEV_REGISTER:
3151 if (!idev && dev->mtu >= IPV6_MIN_MTU) {
3152 idev = ipv6_add_dev(dev);
3154 return notifier_from_errno(PTR_ERR(idev));
3158 case NETDEV_CHANGEMTU:
3159 /* if MTU under IPV6_MIN_MTU stop IPv6 on this interface. */
3160 if (dev->mtu < IPV6_MIN_MTU) {
3161 addrconf_ifdown(dev, 1);
3166 rt6_mtu_change(dev, dev->mtu);
3167 idev->cnf.mtu6 = dev->mtu;
3171 /* allocate new idev */
3172 idev = ipv6_add_dev(dev);
3176 /* device is still not ready */
3177 if (!(idev->if_flags & IF_READY))
3186 if (dev->flags & IFF_SLAVE)
3189 if (idev && idev->cnf.disable_ipv6)
3192 if (event == NETDEV_UP) {
3193 if (!addrconf_qdisc_ok(dev)) {
3194 /* device is not ready yet. */
3195 pr_info("ADDRCONF(NETDEV_UP): %s: link is not ready\n",
3200 if (!idev && dev->mtu >= IPV6_MIN_MTU)
3201 idev = ipv6_add_dev(dev);
3203 if (!IS_ERR_OR_NULL(idev)) {
3204 idev->if_flags |= IF_READY;
3207 } else if (event == NETDEV_CHANGE) {
3208 if (!addrconf_qdisc_ok(dev)) {
3209 /* device is still not ready. */
3214 if (idev->if_flags & IF_READY)
3215 /* device is already configured. */
3217 idev->if_flags |= IF_READY;
3220 pr_info("ADDRCONF(NETDEV_CHANGE): %s: link becomes ready\n",
3226 switch (dev->type) {
3227 #if IS_ENABLED(CONFIG_IPV6_SIT)
3229 addrconf_sit_config(dev);
3232 #if IS_ENABLED(CONFIG_NET_IPGRE)
3234 addrconf_gre_config(dev);
3237 case ARPHRD_LOOPBACK:
3242 addrconf_dev_config(dev);
3246 if (!IS_ERR_OR_NULL(idev)) {
3248 addrconf_dad_run(idev);
3251 * If the MTU changed during the interface down,
3252 * when the interface up, the changed MTU must be
3253 * reflected in the idev as well as routers.
3255 if (idev->cnf.mtu6 != dev->mtu &&
3256 dev->mtu >= IPV6_MIN_MTU) {
3257 rt6_mtu_change(dev, dev->mtu);
3258 idev->cnf.mtu6 = dev->mtu;
3260 idev->tstamp = jiffies;
3261 inet6_ifinfo_notify(RTM_NEWLINK, idev);
3264 * If the changed mtu during down is lower than
3265 * IPV6_MIN_MTU stop IPv6 on this interface.
3267 if (dev->mtu < IPV6_MIN_MTU)
3268 addrconf_ifdown(dev, 1);
3273 case NETDEV_UNREGISTER:
3275 * Remove all addresses from this interface.
3277 addrconf_ifdown(dev, event != NETDEV_DOWN);
3280 case NETDEV_CHANGENAME:
3282 snmp6_unregister_dev(idev);
3283 addrconf_sysctl_unregister(idev);
3284 err = addrconf_sysctl_register(idev);
3286 return notifier_from_errno(err);
3287 err = snmp6_register_dev(idev);
3289 addrconf_sysctl_unregister(idev);
3290 return notifier_from_errno(err);
3295 case NETDEV_PRE_TYPE_CHANGE:
3296 case NETDEV_POST_TYPE_CHANGE:
3297 addrconf_type_change(dev, event);
3305 * addrconf module should be notified of a device going up
3307 static struct notifier_block ipv6_dev_notf = {
3308 .notifier_call = addrconf_notify,
3311 static void addrconf_type_change(struct net_device *dev, unsigned long event)
3313 struct inet6_dev *idev;
3316 idev = __in6_dev_get(dev);
3318 if (event == NETDEV_POST_TYPE_CHANGE)
3319 ipv6_mc_remap(idev);
3320 else if (event == NETDEV_PRE_TYPE_CHANGE)
3321 ipv6_mc_unmap(idev);
3324 static int addrconf_ifdown(struct net_device *dev, int how)
3326 struct net *net = dev_net(dev);
3327 struct inet6_dev *idev;
3328 struct inet6_ifaddr *ifa;
3333 rt6_ifdown(net, dev);
3334 neigh_ifdown(&nd_tbl, dev);
3336 idev = __in6_dev_get(dev);
3341 * Step 1: remove reference to ipv6 device from parent device.
3347 /* protected by rtnl_lock */
3348 RCU_INIT_POINTER(dev->ip6_ptr, NULL);
3350 /* Step 1.5: remove snmp6 entry */
3351 snmp6_unregister_dev(idev);
3355 /* Step 2: clear hash table */
3356 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3357 struct hlist_head *h = &inet6_addr_lst[i];
3359 spin_lock_bh(&addrconf_hash_lock);
3361 hlist_for_each_entry_rcu(ifa, h, addr_lst) {
3362 if (ifa->idev == idev) {
3363 hlist_del_init_rcu(&ifa->addr_lst);
3364 addrconf_del_dad_work(ifa);
3368 spin_unlock_bh(&addrconf_hash_lock);
3371 write_lock_bh(&idev->lock);
3373 addrconf_del_rs_timer(idev);
3375 /* Step 2: clear flags for stateless addrconf */
3377 idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
3379 if (how && del_timer(&idev->regen_timer))
3382 /* Step 3: clear tempaddr list */
3383 while (!list_empty(&idev->tempaddr_list)) {
3384 ifa = list_first_entry(&idev->tempaddr_list,
3385 struct inet6_ifaddr, tmp_list);
3386 list_del(&ifa->tmp_list);
3387 write_unlock_bh(&idev->lock);
3388 spin_lock_bh(&ifa->lock);
3391 in6_ifa_put(ifa->ifpub);
3394 spin_unlock_bh(&ifa->lock);
3396 write_lock_bh(&idev->lock);
3399 while (!list_empty(&idev->addr_list)) {
3400 ifa = list_first_entry(&idev->addr_list,
3401 struct inet6_ifaddr, if_list);
3402 addrconf_del_dad_work(ifa);
3404 list_del(&ifa->if_list);
3406 write_unlock_bh(&idev->lock);
3408 spin_lock_bh(&ifa->lock);
3410 ifa->state = INET6_IFADDR_STATE_DEAD;
3411 spin_unlock_bh(&ifa->lock);
3413 if (state != INET6_IFADDR_STATE_DEAD) {
3414 __ipv6_ifa_notify(RTM_DELADDR, ifa);
3415 inet6addr_notifier_call_chain(NETDEV_DOWN, ifa);
3419 write_lock_bh(&idev->lock);
3422 write_unlock_bh(&idev->lock);
3424 /* Step 5: Discard anycast and multicast list */
3426 ipv6_ac_destroy_dev(idev);
3427 ipv6_mc_destroy_dev(idev);
3432 idev->tstamp = jiffies;
3434 /* Last: Shot the device (if unregistered) */
3436 addrconf_sysctl_unregister(idev);
3437 neigh_parms_release(&nd_tbl, idev->nd_parms);
3438 neigh_ifdown(&nd_tbl, dev);
3444 static void addrconf_rs_timer(unsigned long data)
3446 struct inet6_dev *idev = (struct inet6_dev *)data;
3447 struct net_device *dev = idev->dev;
3448 struct in6_addr lladdr;
3450 write_lock(&idev->lock);
3451 if (idev->dead || !(idev->if_flags & IF_READY))
3454 if (!ipv6_accept_ra(idev))
3457 /* Announcement received after solicitation was sent */
3458 if (idev->if_flags & IF_RA_RCVD)
3461 if (idev->rs_probes++ < idev->cnf.rtr_solicits) {
3462 write_unlock(&idev->lock);
3463 if (!ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3464 ndisc_send_rs(dev, &lladdr,
3465 &in6addr_linklocal_allrouters);
3469 write_lock(&idev->lock);
3470 /* The wait after the last probe can be shorter */
3471 addrconf_mod_rs_timer(idev, (idev->rs_probes ==
3472 idev->cnf.rtr_solicits) ?
3473 idev->cnf.rtr_solicit_delay :
3474 idev->cnf.rtr_solicit_interval);
3477 * Note: we do not support deprecated "all on-link"
3478 * assumption any longer.
3480 pr_debug("%s: no IPv6 routers present\n", idev->dev->name);
3484 write_unlock(&idev->lock);
3490 * Duplicate Address Detection
3492 static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
3494 unsigned long rand_num;
3495 struct inet6_dev *idev = ifp->idev;
3497 if (ifp->flags & IFA_F_OPTIMISTIC)
3500 rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
3502 ifp->dad_probes = idev->cnf.dad_transmits;
3503 addrconf_mod_dad_work(ifp, rand_num);
3506 static void addrconf_dad_begin(struct inet6_ifaddr *ifp)
3508 struct inet6_dev *idev = ifp->idev;
3509 struct net_device *dev = idev->dev;
3510 bool notify = false;
3512 addrconf_join_solict(dev, &ifp->addr);
3514 prandom_seed((__force u32) ifp->addr.s6_addr32[3]);
3516 read_lock_bh(&idev->lock);
3517 spin_lock(&ifp->lock);
3518 if (ifp->state == INET6_IFADDR_STATE_DEAD)
3521 if (dev->flags&(IFF_NOARP|IFF_LOOPBACK) ||
3522 idev->cnf.accept_dad < 1 ||
3523 !(ifp->flags&IFA_F_TENTATIVE) ||
3524 ifp->flags & IFA_F_NODAD) {
3525 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3526 spin_unlock(&ifp->lock);
3527 read_unlock_bh(&idev->lock);
3529 addrconf_dad_completed(ifp);
3533 if (!(idev->if_flags & IF_READY)) {
3534 spin_unlock(&ifp->lock);
3535 read_unlock_bh(&idev->lock);
3537 * If the device is not ready:
3538 * - keep it tentative if it is a permanent address.
3539 * - otherwise, kill it.
3542 addrconf_dad_stop(ifp, 0);
3547 * Optimistic nodes can start receiving
3550 if (ifp->flags & IFA_F_OPTIMISTIC) {
3551 ip6_ins_rt(ifp->rt);
3552 if (ipv6_use_optimistic_addr(idev)) {
3553 /* Because optimistic nodes can use this address,
3554 * notify listeners. If DAD fails, RTM_DELADDR is sent.
3560 addrconf_dad_kick(ifp);
3562 spin_unlock(&ifp->lock);
3563 read_unlock_bh(&idev->lock);
3565 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3568 static void addrconf_dad_start(struct inet6_ifaddr *ifp)
3570 bool begin_dad = false;
3572 spin_lock_bh(&ifp->lock);
3573 if (ifp->state != INET6_IFADDR_STATE_DEAD) {
3574 ifp->state = INET6_IFADDR_STATE_PREDAD;
3577 spin_unlock_bh(&ifp->lock);
3580 addrconf_mod_dad_work(ifp, 0);
3583 static void addrconf_dad_work(struct work_struct *w)
3585 struct inet6_ifaddr *ifp = container_of(to_delayed_work(w),
3586 struct inet6_ifaddr,
3588 struct inet6_dev *idev = ifp->idev;
3589 struct in6_addr mcaddr;
3595 } action = DAD_PROCESS;
3599 spin_lock_bh(&ifp->lock);
3600 if (ifp->state == INET6_IFADDR_STATE_PREDAD) {
3602 ifp->state = INET6_IFADDR_STATE_DAD;
3603 } else if (ifp->state == INET6_IFADDR_STATE_ERRDAD) {
3605 ifp->state = INET6_IFADDR_STATE_POSTDAD;
3607 spin_unlock_bh(&ifp->lock);
3609 if (action == DAD_BEGIN) {
3610 addrconf_dad_begin(ifp);
3612 } else if (action == DAD_ABORT) {
3614 addrconf_dad_stop(ifp, 1);
3618 if (!ifp->dad_probes && addrconf_dad_end(ifp))
3621 write_lock_bh(&idev->lock);
3622 if (idev->dead || !(idev->if_flags & IF_READY)) {
3623 write_unlock_bh(&idev->lock);
3627 spin_lock(&ifp->lock);
3628 if (ifp->state == INET6_IFADDR_STATE_DEAD) {
3629 spin_unlock(&ifp->lock);
3630 write_unlock_bh(&idev->lock);
3634 if (ifp->dad_probes == 0) {
3636 * DAD was successful
3639 ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
3640 spin_unlock(&ifp->lock);
3641 write_unlock_bh(&idev->lock);
3643 addrconf_dad_completed(ifp);
3649 addrconf_mod_dad_work(ifp,
3650 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME));
3651 spin_unlock(&ifp->lock);
3652 write_unlock_bh(&idev->lock);
3654 /* send a neighbour solicitation for our addr */
3655 addrconf_addr_solict_mult(&ifp->addr, &mcaddr);
3656 ndisc_send_ns(ifp->idev->dev, &ifp->addr, &mcaddr, &in6addr_any);
3662 /* ifp->idev must be at least read locked */
3663 static bool ipv6_lonely_lladdr(struct inet6_ifaddr *ifp)
3665 struct inet6_ifaddr *ifpiter;
3666 struct inet6_dev *idev = ifp->idev;
3668 list_for_each_entry_reverse(ifpiter, &idev->addr_list, if_list) {
3669 if (ifpiter->scope > IFA_LINK)
3671 if (ifp != ifpiter && ifpiter->scope == IFA_LINK &&
3672 (ifpiter->flags & (IFA_F_PERMANENT|IFA_F_TENTATIVE|
3673 IFA_F_OPTIMISTIC|IFA_F_DADFAILED)) ==
3680 static void addrconf_dad_completed(struct inet6_ifaddr *ifp)
3682 struct net_device *dev = ifp->idev->dev;
3683 struct in6_addr lladdr;
3684 bool send_rs, send_mld;
3686 addrconf_del_dad_work(ifp);
3689 * Configure the address for reception. Now it is valid.
3692 ipv6_ifa_notify(RTM_NEWADDR, ifp);
3694 /* If added prefix is link local and we are prepared to process
3695 router advertisements, start sending router solicitations.
3698 read_lock_bh(&ifp->idev->lock);
3699 send_mld = ifp->scope == IFA_LINK && ipv6_lonely_lladdr(ifp);
3700 send_rs = send_mld &&
3701 ipv6_accept_ra(ifp->idev) &&
3702 ifp->idev->cnf.rtr_solicits > 0 &&
3703 (dev->flags&IFF_LOOPBACK) == 0;
3704 read_unlock_bh(&ifp->idev->lock);
3706 /* While dad is in progress mld report's source address is in6_addrany.
3707 * Resend with proper ll now.
3710 ipv6_mc_dad_complete(ifp->idev);
3714 * If a host as already performed a random delay
3715 * [...] as part of DAD [...] there is no need
3716 * to delay again before sending the first RS
3718 if (ipv6_get_lladdr(dev, &lladdr, IFA_F_TENTATIVE))
3720 ndisc_send_rs(dev, &lladdr, &in6addr_linklocal_allrouters);
3722 write_lock_bh(&ifp->idev->lock);
3723 spin_lock(&ifp->lock);
3724 ifp->idev->rs_probes = 1;
3725 ifp->idev->if_flags |= IF_RS_SENT;
3726 addrconf_mod_rs_timer(ifp->idev,
3727 ifp->idev->cnf.rtr_solicit_interval);
3728 spin_unlock(&ifp->lock);
3729 write_unlock_bh(&ifp->idev->lock);
3733 static void addrconf_dad_run(struct inet6_dev *idev)
3735 struct inet6_ifaddr *ifp;
3737 read_lock_bh(&idev->lock);
3738 list_for_each_entry(ifp, &idev->addr_list, if_list) {
3739 spin_lock(&ifp->lock);
3740 if (ifp->flags & IFA_F_TENTATIVE &&
3741 ifp->state == INET6_IFADDR_STATE_DAD)
3742 addrconf_dad_kick(ifp);
3743 spin_unlock(&ifp->lock);
3745 read_unlock_bh(&idev->lock);
3748 #ifdef CONFIG_PROC_FS
3749 struct if6_iter_state {
3750 struct seq_net_private p;
3755 static struct inet6_ifaddr *if6_get_first(struct seq_file *seq, loff_t pos)
3757 struct inet6_ifaddr *ifa = NULL;
3758 struct if6_iter_state *state = seq->private;
3759 struct net *net = seq_file_net(seq);
3762 /* initial bucket if pos is 0 */
3768 for (; state->bucket < IN6_ADDR_HSIZE; ++state->bucket) {
3769 hlist_for_each_entry_rcu_bh(ifa, &inet6_addr_lst[state->bucket],
3771 if (!net_eq(dev_net(ifa->idev->dev), net))
3773 /* sync with offset */
3774 if (p < state->offset) {
3782 /* prepare for next bucket */
3789 static struct inet6_ifaddr *if6_get_next(struct seq_file *seq,
3790 struct inet6_ifaddr *ifa)
3792 struct if6_iter_state *state = seq->private;
3793 struct net *net = seq_file_net(seq);
3795 hlist_for_each_entry_continue_rcu_bh(ifa, addr_lst) {
3796 if (!net_eq(dev_net(ifa->idev->dev), net))
3802 while (++state->bucket < IN6_ADDR_HSIZE) {
3804 hlist_for_each_entry_rcu_bh(ifa,
3805 &inet6_addr_lst[state->bucket], addr_lst) {
3806 if (!net_eq(dev_net(ifa->idev->dev), net))
3816 static void *if6_seq_start(struct seq_file *seq, loff_t *pos)
3820 return if6_get_first(seq, *pos);
3823 static void *if6_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3825 struct inet6_ifaddr *ifa;
3827 ifa = if6_get_next(seq, v);
3832 static void if6_seq_stop(struct seq_file *seq, void *v)
3835 rcu_read_unlock_bh();
3838 static int if6_seq_show(struct seq_file *seq, void *v)
3840 struct inet6_ifaddr *ifp = (struct inet6_ifaddr *)v;
3841 seq_printf(seq, "%pi6 %02x %02x %02x %02x %8s\n",
3843 ifp->idev->dev->ifindex,
3847 ifp->idev->dev->name);
3851 static const struct seq_operations if6_seq_ops = {
3852 .start = if6_seq_start,
3853 .next = if6_seq_next,
3854 .show = if6_seq_show,
3855 .stop = if6_seq_stop,
3858 static int if6_seq_open(struct inode *inode, struct file *file)
3860 return seq_open_net(inode, file, &if6_seq_ops,
3861 sizeof(struct if6_iter_state));
3864 static const struct file_operations if6_fops = {
3865 .owner = THIS_MODULE,
3866 .open = if6_seq_open,
3868 .llseek = seq_lseek,
3869 .release = seq_release_net,
3872 static int __net_init if6_proc_net_init(struct net *net)
3874 if (!proc_create("if_inet6", S_IRUGO, net->proc_net, &if6_fops))
3879 static void __net_exit if6_proc_net_exit(struct net *net)
3881 remove_proc_entry("if_inet6", net->proc_net);
3884 static struct pernet_operations if6_proc_net_ops = {
3885 .init = if6_proc_net_init,
3886 .exit = if6_proc_net_exit,
3889 int __init if6_proc_init(void)
3891 return register_pernet_subsys(&if6_proc_net_ops);
3894 void if6_proc_exit(void)
3896 unregister_pernet_subsys(&if6_proc_net_ops);
3898 #endif /* CONFIG_PROC_FS */
3900 #if IS_ENABLED(CONFIG_IPV6_MIP6)
3901 /* Check if address is a home address configured on any interface. */
3902 int ipv6_chk_home_addr(struct net *net, const struct in6_addr *addr)
3905 struct inet6_ifaddr *ifp = NULL;
3906 unsigned int hash = inet6_addr_hash(addr);
3909 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[hash], addr_lst) {
3910 if (!net_eq(dev_net(ifp->idev->dev), net))
3912 if (ipv6_addr_equal(&ifp->addr, addr) &&
3913 (ifp->flags & IFA_F_HOMEADDRESS)) {
3918 rcu_read_unlock_bh();
3924 * Periodic address status verification
3927 static void addrconf_verify_rtnl(void)
3929 unsigned long now, next, next_sec, next_sched;
3930 struct inet6_ifaddr *ifp;
3937 next = round_jiffies_up(now + ADDR_CHECK_FREQUENCY);
3939 cancel_delayed_work(&addr_chk_work);
3941 for (i = 0; i < IN6_ADDR_HSIZE; i++) {
3943 hlist_for_each_entry_rcu_bh(ifp, &inet6_addr_lst[i], addr_lst) {
3946 /* When setting preferred_lft to a value not zero or
3947 * infinity, while valid_lft is infinity
3948 * IFA_F_PERMANENT has a non-infinity life time.
3950 if ((ifp->flags & IFA_F_PERMANENT) &&
3951 (ifp->prefered_lft == INFINITY_LIFE_TIME))
3954 spin_lock(&ifp->lock);
3955 /* We try to batch several events at once. */
3956 age = (now - ifp->tstamp + ADDRCONF_TIMER_FUZZ_MINUS) / HZ;
3958 if (ifp->valid_lft != INFINITY_LIFE_TIME &&
3959 age >= ifp->valid_lft) {
3960 spin_unlock(&ifp->lock);
3964 } else if (ifp->prefered_lft == INFINITY_LIFE_TIME) {
3965 spin_unlock(&ifp->lock);
3967 } else if (age >= ifp->prefered_lft) {
3968 /* jiffies - ifp->tstamp > age >= ifp->prefered_lft */
3971 if (!(ifp->flags&IFA_F_DEPRECATED)) {
3973 ifp->flags |= IFA_F_DEPRECATED;
3976 if ((ifp->valid_lft != INFINITY_LIFE_TIME) &&
3977 (time_before(ifp->tstamp + ifp->valid_lft * HZ, next)))
3978 next = ifp->tstamp + ifp->valid_lft * HZ;
3980 spin_unlock(&ifp->lock);
3985 ipv6_ifa_notify(0, ifp);
3989 } else if ((ifp->flags&IFA_F_TEMPORARY) &&
3990 !(ifp->flags&IFA_F_TENTATIVE)) {
3991 unsigned long regen_advance = ifp->idev->cnf.regen_max_retry *
3992 ifp->idev->cnf.dad_transmits *
3993 NEIGH_VAR(ifp->idev->nd_parms, RETRANS_TIME) / HZ;
3995 if (age >= ifp->prefered_lft - regen_advance) {
3996 struct inet6_ifaddr *ifpub = ifp->ifpub;
3997 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
3998 next = ifp->tstamp + ifp->prefered_lft * HZ;
3999 if (!ifp->regen_count && ifpub) {
4002 in6_ifa_hold(ifpub);
4003 spin_unlock(&ifp->lock);
4005 spin_lock(&ifpub->lock);
4006 ifpub->regen_count = 0;
4007 spin_unlock(&ifpub->lock);
4008 ipv6_create_tempaddr(ifpub, ifp);
4013 } else if (time_before(ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ, next))
4014 next = ifp->tstamp + ifp->prefered_lft * HZ - regen_advance * HZ;
4015 spin_unlock(&ifp->lock);
4017 /* ifp->prefered_lft <= ifp->valid_lft */
4018 if (time_before(ifp->tstamp + ifp->prefered_lft * HZ, next))
4019 next = ifp->tstamp + ifp->prefered_lft * HZ;
4020 spin_unlock(&ifp->lock);
4025 next_sec = round_jiffies_up(next);
4028 /* If rounded timeout is accurate enough, accept it. */
4029 if (time_before(next_sec, next + ADDRCONF_TIMER_FUZZ))
4030 next_sched = next_sec;
4032 /* And minimum interval is ADDRCONF_TIMER_FUZZ_MAX. */
4033 if (time_before(next_sched, jiffies + ADDRCONF_TIMER_FUZZ_MAX))
4034 next_sched = jiffies + ADDRCONF_TIMER_FUZZ_MAX;
4036 ADBG(KERN_DEBUG "now = %lu, schedule = %lu, rounded schedule = %lu => %lu\n",
4037 now, next, next_sec, next_sched);
4038 mod_delayed_work(addrconf_wq, &addr_chk_work, next_sched - now);
4039 rcu_read_unlock_bh();
4042 static void addrconf_verify_work(struct work_struct *w)
4045 addrconf_verify_rtnl();
4049 static void addrconf_verify(void)
4051 mod_delayed_work(addrconf_wq, &addr_chk_work, 0);
4054 static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
4055 struct in6_addr **peer_pfx)
4057 struct in6_addr *pfx = NULL;
4062 pfx = nla_data(addr);
4065 if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
4067 pfx = nla_data(local);
4073 static const struct nla_policy ifa_ipv6_policy[IFA_MAX+1] = {
4074 [IFA_ADDRESS] = { .len = sizeof(struct in6_addr) },
4075 [IFA_LOCAL] = { .len = sizeof(struct in6_addr) },
4076 [IFA_CACHEINFO] = { .len = sizeof(struct ifa_cacheinfo) },
4077 [IFA_FLAGS] = { .len = sizeof(u32) },
4081 inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
4083 struct net *net = sock_net(skb->sk);
4084 struct ifaddrmsg *ifm;
4085 struct nlattr *tb[IFA_MAX+1];
4086 struct in6_addr *pfx, *peer_pfx;
4090 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4094 ifm = nlmsg_data(nlh);
4095 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4099 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4101 /* We ignore other flags so far. */
4102 ifa_flags &= IFA_F_MANAGETEMPADDR;
4104 return inet6_addr_del(net, ifm->ifa_index, ifa_flags, pfx,
4105 ifm->ifa_prefixlen);
4108 static int inet6_addr_modify(struct inet6_ifaddr *ifp, u32 ifa_flags,
4109 u32 prefered_lft, u32 valid_lft)
4113 unsigned long timeout;
4114 bool was_managetempaddr;
4115 bool had_prefixroute;
4119 if (!valid_lft || (prefered_lft > valid_lft))
4122 if (ifa_flags & IFA_F_MANAGETEMPADDR &&
4123 (ifp->flags & IFA_F_TEMPORARY || ifp->prefix_len != 64))
4126 timeout = addrconf_timeout_fixup(valid_lft, HZ);
4127 if (addrconf_finite_timeout(timeout)) {
4128 expires = jiffies_to_clock_t(timeout * HZ);
4129 valid_lft = timeout;
4130 flags = RTF_EXPIRES;
4134 ifa_flags |= IFA_F_PERMANENT;
4137 timeout = addrconf_timeout_fixup(prefered_lft, HZ);
4138 if (addrconf_finite_timeout(timeout)) {
4140 ifa_flags |= IFA_F_DEPRECATED;
4141 prefered_lft = timeout;
4144 spin_lock_bh(&ifp->lock);
4145 was_managetempaddr = ifp->flags & IFA_F_MANAGETEMPADDR;
4146 had_prefixroute = ifp->flags & IFA_F_PERMANENT &&
4147 !(ifp->flags & IFA_F_NOPREFIXROUTE);
4148 ifp->flags &= ~(IFA_F_DEPRECATED | IFA_F_PERMANENT | IFA_F_NODAD |
4149 IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4150 IFA_F_NOPREFIXROUTE);
4151 ifp->flags |= ifa_flags;
4152 ifp->tstamp = jiffies;
4153 ifp->valid_lft = valid_lft;
4154 ifp->prefered_lft = prefered_lft;
4156 spin_unlock_bh(&ifp->lock);
4157 if (!(ifp->flags&IFA_F_TENTATIVE))
4158 ipv6_ifa_notify(0, ifp);
4160 if (!(ifa_flags & IFA_F_NOPREFIXROUTE)) {
4161 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->idev->dev,
4163 } else if (had_prefixroute) {
4164 enum cleanup_prefix_rt_t action;
4165 unsigned long rt_expires;
4167 write_lock_bh(&ifp->idev->lock);
4168 action = check_cleanup_prefix_route(ifp, &rt_expires);
4169 write_unlock_bh(&ifp->idev->lock);
4171 if (action != CLEANUP_PREFIX_RT_NOP) {
4172 cleanup_prefix_route(ifp, rt_expires,
4173 action == CLEANUP_PREFIX_RT_DEL);
4177 if (was_managetempaddr || ifp->flags & IFA_F_MANAGETEMPADDR) {
4178 if (was_managetempaddr && !(ifp->flags & IFA_F_MANAGETEMPADDR))
4179 valid_lft = prefered_lft = 0;
4180 manage_tempaddrs(ifp->idev, ifp, valid_lft, prefered_lft,
4181 !was_managetempaddr, jiffies);
4184 addrconf_verify_rtnl();
4190 inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
4192 struct net *net = sock_net(skb->sk);
4193 struct ifaddrmsg *ifm;
4194 struct nlattr *tb[IFA_MAX+1];
4195 struct in6_addr *pfx, *peer_pfx;
4196 struct inet6_ifaddr *ifa;
4197 struct net_device *dev;
4198 u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
4202 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4206 ifm = nlmsg_data(nlh);
4207 pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
4211 if (tb[IFA_CACHEINFO]) {
4212 struct ifa_cacheinfo *ci;
4214 ci = nla_data(tb[IFA_CACHEINFO]);
4215 valid_lft = ci->ifa_valid;
4216 preferred_lft = ci->ifa_prefered;
4218 preferred_lft = INFINITY_LIFE_TIME;
4219 valid_lft = INFINITY_LIFE_TIME;
4222 dev = __dev_get_by_index(net, ifm->ifa_index);
4226 ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) : ifm->ifa_flags;
4228 /* We ignore other flags so far. */
4229 ifa_flags &= IFA_F_NODAD | IFA_F_HOMEADDRESS | IFA_F_MANAGETEMPADDR |
4230 IFA_F_NOPREFIXROUTE | IFA_F_MCAUTOJOIN;
4232 ifa = ipv6_get_ifaddr(net, pfx, dev, 1);
4235 * It would be best to check for !NLM_F_CREATE here but
4236 * userspace already relies on not having to provide this.
4238 return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
4239 ifm->ifa_prefixlen, ifa_flags,
4240 preferred_lft, valid_lft);
4243 if (nlh->nlmsg_flags & NLM_F_EXCL ||
4244 !(nlh->nlmsg_flags & NLM_F_REPLACE))
4247 err = inet6_addr_modify(ifa, ifa_flags, preferred_lft, valid_lft);
4254 static void put_ifaddrmsg(struct nlmsghdr *nlh, u8 prefixlen, u32 flags,
4255 u8 scope, int ifindex)
4257 struct ifaddrmsg *ifm;
4259 ifm = nlmsg_data(nlh);
4260 ifm->ifa_family = AF_INET6;
4261 ifm->ifa_prefixlen = prefixlen;
4262 ifm->ifa_flags = flags;
4263 ifm->ifa_scope = scope;
4264 ifm->ifa_index = ifindex;
4267 static int put_cacheinfo(struct sk_buff *skb, unsigned long cstamp,
4268 unsigned long tstamp, u32 preferred, u32 valid)
4270 struct ifa_cacheinfo ci;
4272 ci.cstamp = cstamp_delta(cstamp);
4273 ci.tstamp = cstamp_delta(tstamp);
4274 ci.ifa_prefered = preferred;
4275 ci.ifa_valid = valid;
4277 return nla_put(skb, IFA_CACHEINFO, sizeof(ci), &ci);
4280 static inline int rt_scope(int ifa_scope)
4282 if (ifa_scope & IFA_HOST)
4283 return RT_SCOPE_HOST;
4284 else if (ifa_scope & IFA_LINK)
4285 return RT_SCOPE_LINK;
4286 else if (ifa_scope & IFA_SITE)
4287 return RT_SCOPE_SITE;
4289 return RT_SCOPE_UNIVERSE;
4292 static inline int inet6_ifaddr_msgsize(void)
4294 return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
4295 + nla_total_size(16) /* IFA_LOCAL */
4296 + nla_total_size(16) /* IFA_ADDRESS */
4297 + nla_total_size(sizeof(struct ifa_cacheinfo))
4298 + nla_total_size(4) /* IFA_FLAGS */;
4301 static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
4302 u32 portid, u32 seq, int event, unsigned int flags)
4304 struct nlmsghdr *nlh;
4305 u32 preferred, valid;
4307 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4311 put_ifaddrmsg(nlh, ifa->prefix_len, ifa->flags, rt_scope(ifa->scope),
4312 ifa->idev->dev->ifindex);
4314 if (!((ifa->flags&IFA_F_PERMANENT) &&
4315 (ifa->prefered_lft == INFINITY_LIFE_TIME))) {
4316 preferred = ifa->prefered_lft;
4317 valid = ifa->valid_lft;
4318 if (preferred != INFINITY_LIFE_TIME) {
4319 long tval = (jiffies - ifa->tstamp)/HZ;
4320 if (preferred > tval)
4324 if (valid != INFINITY_LIFE_TIME) {
4332 preferred = INFINITY_LIFE_TIME;
4333 valid = INFINITY_LIFE_TIME;
4336 if (!ipv6_addr_any(&ifa->peer_addr)) {
4337 if (nla_put_in6_addr(skb, IFA_LOCAL, &ifa->addr) < 0 ||
4338 nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->peer_addr) < 0)
4341 if (nla_put_in6_addr(skb, IFA_ADDRESS, &ifa->addr) < 0)
4344 if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
4347 if (nla_put_u32(skb, IFA_FLAGS, ifa->flags) < 0)
4350 nlmsg_end(skb, nlh);
4354 nlmsg_cancel(skb, nlh);
4358 static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
4359 u32 portid, u32 seq, int event, u16 flags)
4361 struct nlmsghdr *nlh;
4362 u8 scope = RT_SCOPE_UNIVERSE;
4363 int ifindex = ifmca->idev->dev->ifindex;
4365 if (ipv6_addr_scope(&ifmca->mca_addr) & IFA_SITE)
4366 scope = RT_SCOPE_SITE;
4368 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4372 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4373 if (nla_put_in6_addr(skb, IFA_MULTICAST, &ifmca->mca_addr) < 0 ||
4374 put_cacheinfo(skb, ifmca->mca_cstamp, ifmca->mca_tstamp,
4375 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4376 nlmsg_cancel(skb, nlh);
4380 nlmsg_end(skb, nlh);
4384 static int inet6_fill_ifacaddr(struct sk_buff *skb, struct ifacaddr6 *ifaca,
4385 u32 portid, u32 seq, int event, unsigned int flags)
4387 struct nlmsghdr *nlh;
4388 u8 scope = RT_SCOPE_UNIVERSE;
4389 int ifindex = ifaca->aca_idev->dev->ifindex;
4391 if (ipv6_addr_scope(&ifaca->aca_addr) & IFA_SITE)
4392 scope = RT_SCOPE_SITE;
4394 nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct ifaddrmsg), flags);
4398 put_ifaddrmsg(nlh, 128, IFA_F_PERMANENT, scope, ifindex);
4399 if (nla_put_in6_addr(skb, IFA_ANYCAST, &ifaca->aca_addr) < 0 ||
4400 put_cacheinfo(skb, ifaca->aca_cstamp, ifaca->aca_tstamp,
4401 INFINITY_LIFE_TIME, INFINITY_LIFE_TIME) < 0) {
4402 nlmsg_cancel(skb, nlh);
4406 nlmsg_end(skb, nlh);
4416 /* called with rcu_read_lock() */
4417 static int in6_dump_addrs(struct inet6_dev *idev, struct sk_buff *skb,
4418 struct netlink_callback *cb, enum addr_type_t type,
4419 int s_ip_idx, int *p_ip_idx)
4421 struct ifmcaddr6 *ifmca;
4422 struct ifacaddr6 *ifaca;
4424 int ip_idx = *p_ip_idx;
4426 read_lock_bh(&idev->lock);
4428 case UNICAST_ADDR: {
4429 struct inet6_ifaddr *ifa;
4431 /* unicast address incl. temp addr */
4432 list_for_each_entry(ifa, &idev->addr_list, if_list) {
4433 if (++ip_idx < s_ip_idx)
4435 err = inet6_fill_ifaddr(skb, ifa,
4436 NETLINK_CB(cb->skb).portid,
4442 nl_dump_check_consistent(cb, nlmsg_hdr(skb));
4446 case MULTICAST_ADDR:
4447 /* multicast address */
4448 for (ifmca = idev->mc_list; ifmca;
4449 ifmca = ifmca->next, ip_idx++) {
4450 if (ip_idx < s_ip_idx)
4452 err = inet6_fill_ifmcaddr(skb, ifmca,
4453 NETLINK_CB(cb->skb).portid,
4462 /* anycast address */
4463 for (ifaca = idev->ac_list; ifaca;
4464 ifaca = ifaca->aca_next, ip_idx++) {
4465 if (ip_idx < s_ip_idx)
4467 err = inet6_fill_ifacaddr(skb, ifaca,
4468 NETLINK_CB(cb->skb).portid,
4479 read_unlock_bh(&idev->lock);
4484 static int inet6_dump_addr(struct sk_buff *skb, struct netlink_callback *cb,
4485 enum addr_type_t type)
4487 struct net *net = sock_net(skb->sk);
4490 int s_idx, s_ip_idx;
4491 struct net_device *dev;
4492 struct inet6_dev *idev;
4493 struct hlist_head *head;
4496 s_idx = idx = cb->args[1];
4497 s_ip_idx = ip_idx = cb->args[2];
4500 cb->seq = atomic_read(&net->ipv6.dev_addr_genid) ^ net->dev_base_seq;
4501 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
4503 head = &net->dev_index_head[h];
4504 hlist_for_each_entry_rcu(dev, head, index_hlist) {
4507 if (h > s_h || idx > s_idx)
4510 idev = __in6_dev_get(dev);
4514 if (in6_dump_addrs(idev, skb, cb, type,
4515 s_ip_idx, &ip_idx) < 0)
4525 cb->args[2] = ip_idx;
4530 static int inet6_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
4532 enum addr_type_t type = UNICAST_ADDR;
4534 return inet6_dump_addr(skb, cb, type);
4537 static int inet6_dump_ifmcaddr(struct sk_buff *skb, struct netlink_callback *cb)
4539 enum addr_type_t type = MULTICAST_ADDR;
4541 return inet6_dump_addr(skb, cb, type);
4545 static int inet6_dump_ifacaddr(struct sk_buff *skb, struct netlink_callback *cb)
4547 enum addr_type_t type = ANYCAST_ADDR;
4549 return inet6_dump_addr(skb, cb, type);
4552 static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
4554 struct net *net = sock_net(in_skb->sk);
4555 struct ifaddrmsg *ifm;
4556 struct nlattr *tb[IFA_MAX+1];
4557 struct in6_addr *addr = NULL, *peer;
4558 struct net_device *dev = NULL;
4559 struct inet6_ifaddr *ifa;
4560 struct sk_buff *skb;
4563 err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
4567 addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
4573 ifm = nlmsg_data(nlh);
4575 dev = __dev_get_by_index(net, ifm->ifa_index);
4577 ifa = ipv6_get_ifaddr(net, addr, dev, 1);
4579 err = -EADDRNOTAVAIL;
4583 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_KERNEL);
4589 err = inet6_fill_ifaddr(skb, ifa, NETLINK_CB(in_skb).portid,
4590 nlh->nlmsg_seq, RTM_NEWADDR, 0);
4592 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4593 WARN_ON(err == -EMSGSIZE);
4597 err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
4604 static void inet6_ifa_notify(int event, struct inet6_ifaddr *ifa)
4606 struct sk_buff *skb;
4607 struct net *net = dev_net(ifa->idev->dev);
4610 skb = nlmsg_new(inet6_ifaddr_msgsize(), GFP_ATOMIC);
4614 err = inet6_fill_ifaddr(skb, ifa, 0, 0, event, 0);
4616 /* -EMSGSIZE implies BUG in inet6_ifaddr_msgsize() */
4617 WARN_ON(err == -EMSGSIZE);
4621 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFADDR, NULL, GFP_ATOMIC);
4625 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFADDR, err);
4628 static inline void ipv6_store_devconf(struct ipv6_devconf *cnf,
4629 __s32 *array, int bytes)
4631 BUG_ON(bytes < (DEVCONF_MAX * 4));
4633 memset(array, 0, bytes);
4634 array[DEVCONF_FORWARDING] = cnf->forwarding;
4635 array[DEVCONF_HOPLIMIT] = cnf->hop_limit;
4636 array[DEVCONF_MTU6] = cnf->mtu6;
4637 array[DEVCONF_ACCEPT_RA] = cnf->accept_ra;
4638 array[DEVCONF_ACCEPT_REDIRECTS] = cnf->accept_redirects;
4639 array[DEVCONF_AUTOCONF] = cnf->autoconf;
4640 array[DEVCONF_DAD_TRANSMITS] = cnf->dad_transmits;
4641 array[DEVCONF_RTR_SOLICITS] = cnf->rtr_solicits;
4642 array[DEVCONF_RTR_SOLICIT_INTERVAL] =
4643 jiffies_to_msecs(cnf->rtr_solicit_interval);
4644 array[DEVCONF_RTR_SOLICIT_DELAY] =
4645 jiffies_to_msecs(cnf->rtr_solicit_delay);
4646 array[DEVCONF_FORCE_MLD_VERSION] = cnf->force_mld_version;
4647 array[DEVCONF_MLDV1_UNSOLICITED_REPORT_INTERVAL] =
4648 jiffies_to_msecs(cnf->mldv1_unsolicited_report_interval);
4649 array[DEVCONF_MLDV2_UNSOLICITED_REPORT_INTERVAL] =
4650 jiffies_to_msecs(cnf->mldv2_unsolicited_report_interval);
4651 array[DEVCONF_USE_TEMPADDR] = cnf->use_tempaddr;
4652 array[DEVCONF_TEMP_VALID_LFT] = cnf->temp_valid_lft;
4653 array[DEVCONF_TEMP_PREFERED_LFT] = cnf->temp_prefered_lft;
4654 array[DEVCONF_REGEN_MAX_RETRY] = cnf->regen_max_retry;
4655 array[DEVCONF_MAX_DESYNC_FACTOR] = cnf->max_desync_factor;
4656 array[DEVCONF_MAX_ADDRESSES] = cnf->max_addresses;
4657 array[DEVCONF_ACCEPT_RA_DEFRTR] = cnf->accept_ra_defrtr;
4658 array[DEVCONF_ACCEPT_RA_MIN_HOP_LIMIT] = cnf->accept_ra_min_hop_limit;
4659 array[DEVCONF_ACCEPT_RA_PINFO] = cnf->accept_ra_pinfo;
4660 #ifdef CONFIG_IPV6_ROUTER_PREF
4661 array[DEVCONF_ACCEPT_RA_RTR_PREF] = cnf->accept_ra_rtr_pref;
4662 array[DEVCONF_RTR_PROBE_INTERVAL] =
4663 jiffies_to_msecs(cnf->rtr_probe_interval);
4664 #ifdef CONFIG_IPV6_ROUTE_INFO
4665 array[DEVCONF_ACCEPT_RA_RT_INFO_MAX_PLEN] = cnf->accept_ra_rt_info_max_plen;
4668 array[DEVCONF_PROXY_NDP] = cnf->proxy_ndp;
4669 array[DEVCONF_ACCEPT_SOURCE_ROUTE] = cnf->accept_source_route;
4670 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
4671 array[DEVCONF_OPTIMISTIC_DAD] = cnf->optimistic_dad;
4672 array[DEVCONF_USE_OPTIMISTIC] = cnf->use_optimistic;
4674 #ifdef CONFIG_IPV6_MROUTE
4675 array[DEVCONF_MC_FORWARDING] = cnf->mc_forwarding;
4677 array[DEVCONF_DISABLE_IPV6] = cnf->disable_ipv6;
4678 array[DEVCONF_ACCEPT_DAD] = cnf->accept_dad;
4679 array[DEVCONF_FORCE_TLLAO] = cnf->force_tllao;
4680 array[DEVCONF_NDISC_NOTIFY] = cnf->ndisc_notify;
4681 array[DEVCONF_SUPPRESS_FRAG_NDISC] = cnf->suppress_frag_ndisc;
4682 array[DEVCONF_ACCEPT_RA_FROM_LOCAL] = cnf->accept_ra_from_local;
4683 array[DEVCONF_ACCEPT_RA_MTU] = cnf->accept_ra_mtu;
4684 array[DEVCONF_IGNORE_ROUTES_WITH_LINKDOWN] = cnf->ignore_routes_with_linkdown;
4685 /* we omit DEVCONF_STABLE_SECRET for now */
4686 array[DEVCONF_USE_OIF_ADDRS_ONLY] = cnf->use_oif_addrs_only;
4689 static inline size_t inet6_ifla6_size(void)
4691 return nla_total_size(4) /* IFLA_INET6_FLAGS */
4692 + nla_total_size(sizeof(struct ifla_cacheinfo))
4693 + nla_total_size(DEVCONF_MAX * 4) /* IFLA_INET6_CONF */
4694 + nla_total_size(IPSTATS_MIB_MAX * 8) /* IFLA_INET6_STATS */
4695 + nla_total_size(ICMP6_MIB_MAX * 8) /* IFLA_INET6_ICMP6STATS */
4696 + nla_total_size(sizeof(struct in6_addr)); /* IFLA_INET6_TOKEN */
4699 static inline size_t inet6_if_nlmsg_size(void)
4701 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
4702 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
4703 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
4704 + nla_total_size(4) /* IFLA_MTU */
4705 + nla_total_size(4) /* IFLA_LINK */
4706 + nla_total_size(1) /* IFLA_OPERSTATE */
4707 + nla_total_size(inet6_ifla6_size()); /* IFLA_PROTINFO */
4710 static inline void __snmp6_fill_statsdev(u64 *stats, atomic_long_t *mib,
4711 int items, int bytes)
4714 int pad = bytes - sizeof(u64) * items;
4717 /* Use put_unaligned() because stats may not be aligned for u64. */
4718 put_unaligned(items, &stats[0]);
4719 for (i = 1; i < items; i++)
4720 put_unaligned(atomic_long_read(&mib[i]), &stats[i]);
4722 memset(&stats[items], 0, pad);
4725 static inline void __snmp6_fill_stats64(u64 *stats, void __percpu *mib,
4726 int bytes, size_t syncpoff)
4729 u64 buff[IPSTATS_MIB_MAX];
4730 int pad = bytes - sizeof(u64) * IPSTATS_MIB_MAX;
4734 memset(buff, 0, sizeof(buff));
4735 buff[0] = IPSTATS_MIB_MAX;
4737 for_each_possible_cpu(c) {
4738 for (i = 1; i < IPSTATS_MIB_MAX; i++)
4739 buff[i] += snmp_get_cpu_field64(mib, c, i, syncpoff);
4742 memcpy(stats, buff, IPSTATS_MIB_MAX * sizeof(u64));
4743 memset(&stats[IPSTATS_MIB_MAX], 0, pad);
4746 static void snmp6_fill_stats(u64 *stats, struct inet6_dev *idev, int attrtype,
4750 case IFLA_INET6_STATS:
4751 __snmp6_fill_stats64(stats, idev->stats.ipv6, bytes,
4752 offsetof(struct ipstats_mib, syncp));
4754 case IFLA_INET6_ICMP6STATS:
4755 __snmp6_fill_statsdev(stats, idev->stats.icmpv6dev->mibs, ICMP6_MIB_MAX, bytes);
4760 static int inet6_fill_ifla6_attrs(struct sk_buff *skb, struct inet6_dev *idev,
4761 u32 ext_filter_mask)
4764 struct ifla_cacheinfo ci;
4766 if (nla_put_u32(skb, IFLA_INET6_FLAGS, idev->if_flags))
4767 goto nla_put_failure;
4768 ci.max_reasm_len = IPV6_MAXPLEN;
4769 ci.tstamp = cstamp_delta(idev->tstamp);
4770 ci.reachable_time = jiffies_to_msecs(idev->nd_parms->reachable_time);
4771 ci.retrans_time = jiffies_to_msecs(NEIGH_VAR(idev->nd_parms, RETRANS_TIME));
4772 if (nla_put(skb, IFLA_INET6_CACHEINFO, sizeof(ci), &ci))
4773 goto nla_put_failure;
4774 nla = nla_reserve(skb, IFLA_INET6_CONF, DEVCONF_MAX * sizeof(s32));
4776 goto nla_put_failure;
4777 ipv6_store_devconf(&idev->cnf, nla_data(nla), nla_len(nla));
4779 /* XXX - MC not implemented */
4781 if (ext_filter_mask & RTEXT_FILTER_SKIP_STATS)
4784 nla = nla_reserve(skb, IFLA_INET6_STATS, IPSTATS_MIB_MAX * sizeof(u64));
4786 goto nla_put_failure;
4787 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_STATS, nla_len(nla));
4789 nla = nla_reserve(skb, IFLA_INET6_ICMP6STATS, ICMP6_MIB_MAX * sizeof(u64));
4791 goto nla_put_failure;
4792 snmp6_fill_stats(nla_data(nla), idev, IFLA_INET6_ICMP6STATS, nla_len(nla));
4794 nla = nla_reserve(skb, IFLA_INET6_TOKEN, sizeof(struct in6_addr));
4796 goto nla_put_failure;
4798 if (nla_put_u8(skb, IFLA_INET6_ADDR_GEN_MODE, idev->addr_gen_mode))
4799 goto nla_put_failure;
4801 read_lock_bh(&idev->lock);
4802 memcpy(nla_data(nla), idev->token.s6_addr, nla_len(nla));
4803 read_unlock_bh(&idev->lock);
4811 static size_t inet6_get_link_af_size(const struct net_device *dev,
4812 u32 ext_filter_mask)
4814 if (!__in6_dev_get(dev))
4817 return inet6_ifla6_size();
4820 static int inet6_fill_link_af(struct sk_buff *skb, const struct net_device *dev,
4821 u32 ext_filter_mask)
4823 struct inet6_dev *idev = __in6_dev_get(dev);
4828 if (inet6_fill_ifla6_attrs(skb, idev, ext_filter_mask) < 0)
4834 static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
4836 struct inet6_ifaddr *ifp;
4837 struct net_device *dev = idev->dev;
4838 bool update_rs = false;
4839 struct in6_addr ll_addr;
4845 if (ipv6_addr_any(token))
4847 if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
4849 if (!ipv6_accept_ra(idev))
4851 if (idev->cnf.rtr_solicits <= 0)
4854 write_lock_bh(&idev->lock);
4856 BUILD_BUG_ON(sizeof(token->s6_addr) != 16);
4857 memcpy(idev->token.s6_addr + 8, token->s6_addr + 8, 8);
4859 write_unlock_bh(&idev->lock);
4861 if (!idev->dead && (idev->if_flags & IF_READY) &&
4862 !ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
4863 IFA_F_OPTIMISTIC)) {
4865 /* If we're not ready, then normal ifup will take care
4866 * of this. Otherwise, we need to request our rs here.
4868 ndisc_send_rs(dev, &ll_addr, &in6addr_linklocal_allrouters);
4872 write_lock_bh(&idev->lock);
4875 idev->if_flags |= IF_RS_SENT;
4876 idev->rs_probes = 1;
4877 addrconf_mod_rs_timer(idev, idev->cnf.rtr_solicit_interval);
4880 /* Well, that's kinda nasty ... */
4881 list_for_each_entry(ifp, &idev->addr_list, if_list) {
4882 spin_lock(&ifp->lock);
4883 if (ifp->tokenized) {
4885 ifp->prefered_lft = 0;
4887 spin_unlock(&ifp->lock);
4890 write_unlock_bh(&idev->lock);
4891 inet6_ifinfo_notify(RTM_NEWLINK, idev);
4892 addrconf_verify_rtnl();
4896 static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
4897 [IFLA_INET6_ADDR_GEN_MODE] = { .type = NLA_U8 },
4898 [IFLA_INET6_TOKEN] = { .len = sizeof(struct in6_addr) },
4901 static int inet6_validate_link_af(const struct net_device *dev,
4902 const struct nlattr *nla)
4904 struct nlattr *tb[IFLA_INET6_MAX + 1];
4906 if (dev && !__in6_dev_get(dev))
4907 return -EAFNOSUPPORT;
4909 return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
4912 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
4915 struct inet6_dev *idev = __in6_dev_get(dev);
4916 struct nlattr *tb[IFLA_INET6_MAX + 1];
4919 return -EAFNOSUPPORT;
4921 if (nla_parse_nested(tb, IFLA_INET6_MAX, nla, NULL) < 0)
4924 if (tb[IFLA_INET6_TOKEN]) {
4925 err = inet6_set_iftoken(idev, nla_data(tb[IFLA_INET6_TOKEN]));
4930 if (tb[IFLA_INET6_ADDR_GEN_MODE]) {
4931 u8 mode = nla_get_u8(tb[IFLA_INET6_ADDR_GEN_MODE]);
4933 if (mode != IN6_ADDR_GEN_MODE_EUI64 &&
4934 mode != IN6_ADDR_GEN_MODE_NONE &&
4935 mode != IN6_ADDR_GEN_MODE_STABLE_PRIVACY)
4938 if (mode == IN6_ADDR_GEN_MODE_STABLE_PRIVACY &&
4939 !idev->cnf.stable_secret.initialized &&
4940 !dev_net(dev)->ipv6.devconf_dflt->stable_secret.initialized)
4943 idev->addr_gen_mode = mode;
4950 static int inet6_fill_ifinfo(struct sk_buff *skb, struct inet6_dev *idev,
4951 u32 portid, u32 seq, int event, unsigned int flags)
4953 struct net_device *dev = idev->dev;
4954 struct ifinfomsg *hdr;
4955 struct nlmsghdr *nlh;
4958 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
4962 hdr = nlmsg_data(nlh);
4963 hdr->ifi_family = AF_INET6;
4965 hdr->ifi_type = dev->type;
4966 hdr->ifi_index = dev->ifindex;
4967 hdr->ifi_flags = dev_get_flags(dev);
4968 hdr->ifi_change = 0;
4970 if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
4972 nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
4973 nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
4974 (dev->ifindex != dev_get_iflink(dev) &&
4975 nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
4976 nla_put_u8(skb, IFLA_OPERSTATE,
4977 netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
4978 goto nla_put_failure;
4979 protoinfo = nla_nest_start(skb, IFLA_PROTINFO);
4981 goto nla_put_failure;
4983 if (inet6_fill_ifla6_attrs(skb, idev, 0) < 0)
4984 goto nla_put_failure;
4986 nla_nest_end(skb, protoinfo);
4987 nlmsg_end(skb, nlh);
4991 nlmsg_cancel(skb, nlh);
4995 static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
4997 struct net *net = sock_net(skb->sk);
5000 struct net_device *dev;
5001 struct inet6_dev *idev;
5002 struct hlist_head *head;
5005 s_idx = cb->args[1];
5008 for (h = s_h; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
5010 head = &net->dev_index_head[h];
5011 hlist_for_each_entry_rcu(dev, head, index_hlist) {
5014 idev = __in6_dev_get(dev);
5017 if (inet6_fill_ifinfo(skb, idev,
5018 NETLINK_CB(cb->skb).portid,
5020 RTM_NEWLINK, NLM_F_MULTI) < 0)
5034 void inet6_ifinfo_notify(int event, struct inet6_dev *idev)
5036 struct sk_buff *skb;
5037 struct net *net = dev_net(idev->dev);
5040 skb = nlmsg_new(inet6_if_nlmsg_size(), GFP_ATOMIC);
5044 err = inet6_fill_ifinfo(skb, idev, 0, 0, event, 0);
5046 /* -EMSGSIZE implies BUG in inet6_if_nlmsg_size() */
5047 WARN_ON(err == -EMSGSIZE);
5051 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_IFINFO, NULL, GFP_ATOMIC);
5055 rtnl_set_sk_err(net, RTNLGRP_IPV6_IFINFO, err);
5058 static inline size_t inet6_prefix_nlmsg_size(void)
5060 return NLMSG_ALIGN(sizeof(struct prefixmsg))
5061 + nla_total_size(sizeof(struct in6_addr))
5062 + nla_total_size(sizeof(struct prefix_cacheinfo));
5065 static int inet6_fill_prefix(struct sk_buff *skb, struct inet6_dev *idev,
5066 struct prefix_info *pinfo, u32 portid, u32 seq,
5067 int event, unsigned int flags)
5069 struct prefixmsg *pmsg;
5070 struct nlmsghdr *nlh;
5071 struct prefix_cacheinfo ci;
5073 nlh = nlmsg_put(skb, portid, seq, event, sizeof(*pmsg), flags);
5077 pmsg = nlmsg_data(nlh);
5078 pmsg->prefix_family = AF_INET6;
5079 pmsg->prefix_pad1 = 0;
5080 pmsg->prefix_pad2 = 0;
5081 pmsg->prefix_ifindex = idev->dev->ifindex;
5082 pmsg->prefix_len = pinfo->prefix_len;
5083 pmsg->prefix_type = pinfo->type;
5084 pmsg->prefix_pad3 = 0;
5085 pmsg->prefix_flags = 0;
5087 pmsg->prefix_flags |= IF_PREFIX_ONLINK;
5088 if (pinfo->autoconf)
5089 pmsg->prefix_flags |= IF_PREFIX_AUTOCONF;
5091 if (nla_put(skb, PREFIX_ADDRESS, sizeof(pinfo->prefix), &pinfo->prefix))
5092 goto nla_put_failure;
5093 ci.preferred_time = ntohl(pinfo->prefered);
5094 ci.valid_time = ntohl(pinfo->valid);
5095 if (nla_put(skb, PREFIX_CACHEINFO, sizeof(ci), &ci))
5096 goto nla_put_failure;
5097 nlmsg_end(skb, nlh);
5101 nlmsg_cancel(skb, nlh);
5105 static void inet6_prefix_notify(int event, struct inet6_dev *idev,
5106 struct prefix_info *pinfo)
5108 struct sk_buff *skb;
5109 struct net *net = dev_net(idev->dev);
5112 skb = nlmsg_new(inet6_prefix_nlmsg_size(), GFP_ATOMIC);
5116 err = inet6_fill_prefix(skb, idev, pinfo, 0, 0, event, 0);
5118 /* -EMSGSIZE implies BUG in inet6_prefix_nlmsg_size() */
5119 WARN_ON(err == -EMSGSIZE);
5123 rtnl_notify(skb, net, 0, RTNLGRP_IPV6_PREFIX, NULL, GFP_ATOMIC);
5127 rtnl_set_sk_err(net, RTNLGRP_IPV6_PREFIX, err);
5130 static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5132 struct net *net = dev_net(ifp->idev->dev);
5137 inet6_ifa_notify(event ? : RTM_NEWADDR, ifp);
5142 * If the address was optimistic
5143 * we inserted the route at the start of
5144 * our DAD process, so we don't need
5147 if (!(ifp->rt->rt6i_node))
5148 ip6_ins_rt(ifp->rt);
5149 if (ifp->idev->cnf.forwarding)
5150 addrconf_join_anycast(ifp);
5151 if (!ipv6_addr_any(&ifp->peer_addr))
5152 addrconf_prefix_route(&ifp->peer_addr, 128,
5153 ifp->idev->dev, 0, 0);
5156 if (ifp->idev->cnf.forwarding)
5157 addrconf_leave_anycast(ifp);
5158 addrconf_leave_solict(ifp->idev, &ifp->addr);
5159 if (!ipv6_addr_any(&ifp->peer_addr)) {
5160 struct rt6_info *rt;
5162 rt = addrconf_get_prefix_route(&ifp->peer_addr, 128,
5163 ifp->idev->dev, 0, 0);
5167 dst_hold(&ifp->rt->dst);
5169 ip6_del_rt(ifp->rt);
5171 rt_genid_bump_ipv6(net);
5174 atomic_inc(&net->ipv6.dev_addr_genid);
5177 static void ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
5180 if (likely(ifp->idev->dead == 0))
5181 __ipv6_ifa_notify(event, ifp);
5182 rcu_read_unlock_bh();
5185 #ifdef CONFIG_SYSCTL
5188 int addrconf_sysctl_forward(struct ctl_table *ctl, int write,
5189 void __user *buffer, size_t *lenp, loff_t *ppos)
5191 int *valp = ctl->data;
5194 struct ctl_table lctl;
5198 * ctl->data points to idev->cnf.forwarding, we should
5199 * not modify it until we get the rtnl lock.
5204 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5207 ret = addrconf_fixup_forwarding(ctl, valp, val);
5214 int addrconf_sysctl_mtu(struct ctl_table *ctl, int write,
5215 void __user *buffer, size_t *lenp, loff_t *ppos)
5217 struct inet6_dev *idev = ctl->extra1;
5218 int min_mtu = IPV6_MIN_MTU;
5219 struct ctl_table lctl;
5222 lctl.extra1 = &min_mtu;
5223 lctl.extra2 = idev ? &idev->dev->mtu : NULL;
5225 return proc_dointvec_minmax(&lctl, write, buffer, lenp, ppos);
5228 static void dev_disable_change(struct inet6_dev *idev)
5230 struct netdev_notifier_info info;
5232 if (!idev || !idev->dev)
5235 netdev_notifier_info_init(&info, idev->dev);
5236 if (idev->cnf.disable_ipv6)
5237 addrconf_notify(NULL, NETDEV_DOWN, &info);
5239 addrconf_notify(NULL, NETDEV_UP, &info);
5242 static void addrconf_disable_change(struct net *net, __s32 newf)
5244 struct net_device *dev;
5245 struct inet6_dev *idev;
5247 for_each_netdev(net, dev) {
5248 idev = __in6_dev_get(dev);
5250 int changed = (!idev->cnf.disable_ipv6) ^ (!newf);
5251 idev->cnf.disable_ipv6 = newf;
5253 dev_disable_change(idev);
5258 static int addrconf_disable_ipv6(struct ctl_table *table, int *p, int newf)
5263 if (!rtnl_trylock())
5264 return restart_syscall();
5266 net = (struct net *)table->extra2;
5270 if (p == &net->ipv6.devconf_dflt->disable_ipv6) {
5275 if (p == &net->ipv6.devconf_all->disable_ipv6) {
5276 net->ipv6.devconf_dflt->disable_ipv6 = newf;
5277 addrconf_disable_change(net, newf);
5278 } else if ((!newf) ^ (!old))
5279 dev_disable_change((struct inet6_dev *)table->extra1);
5286 int addrconf_sysctl_disable(struct ctl_table *ctl, int write,
5287 void __user *buffer, size_t *lenp, loff_t *ppos)
5289 int *valp = ctl->data;
5292 struct ctl_table lctl;
5296 * ctl->data points to idev->cnf.disable_ipv6, we should
5297 * not modify it until we get the rtnl lock.
5302 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5305 ret = addrconf_disable_ipv6(ctl, valp, val);
5312 int addrconf_sysctl_proxy_ndp(struct ctl_table *ctl, int write,
5313 void __user *buffer, size_t *lenp, loff_t *ppos)
5315 int *valp = ctl->data;
5320 ret = proc_dointvec(ctl, write, buffer, lenp, ppos);
5323 if (write && old != new) {
5324 struct net *net = ctl->extra2;
5326 if (!rtnl_trylock())
5327 return restart_syscall();
5329 if (valp == &net->ipv6.devconf_dflt->proxy_ndp)
5330 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5331 NETCONFA_IFINDEX_DEFAULT,
5332 net->ipv6.devconf_dflt);
5333 else if (valp == &net->ipv6.devconf_all->proxy_ndp)
5334 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5335 NETCONFA_IFINDEX_ALL,
5336 net->ipv6.devconf_all);
5338 struct inet6_dev *idev = ctl->extra1;
5340 inet6_netconf_notify_devconf(net, NETCONFA_PROXY_NEIGH,
5350 static int addrconf_sysctl_stable_secret(struct ctl_table *ctl, int write,
5351 void __user *buffer, size_t *lenp,
5355 struct in6_addr addr;
5356 char str[IPV6_MAX_STRLEN];
5357 struct ctl_table lctl = *ctl;
5358 struct net *net = ctl->extra2;
5359 struct ipv6_stable_secret *secret = ctl->data;
5361 if (&net->ipv6.devconf_all->stable_secret == ctl->data)
5364 lctl.maxlen = IPV6_MAX_STRLEN;
5367 if (!rtnl_trylock())
5368 return restart_syscall();
5370 if (!write && !secret->initialized) {
5375 err = snprintf(str, sizeof(str), "%pI6", &secret->secret);
5376 if (err >= sizeof(str)) {
5381 err = proc_dostring(&lctl, write, buffer, lenp, ppos);
5385 if (in6_pton(str, -1, addr.in6_u.u6_addr8, -1, NULL) != 1) {
5390 secret->initialized = true;
5391 secret->secret = addr;
5393 if (&net->ipv6.devconf_dflt->stable_secret == ctl->data) {
5394 struct net_device *dev;
5396 for_each_netdev(net, dev) {
5397 struct inet6_dev *idev = __in6_dev_get(dev);
5400 idev->addr_gen_mode =
5401 IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5405 struct inet6_dev *idev = ctl->extra1;
5407 idev->addr_gen_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY;
5417 int addrconf_sysctl_ignore_routes_with_linkdown(struct ctl_table *ctl,
5419 void __user *buffer,
5423 int *valp = ctl->data;
5426 struct ctl_table lctl;
5429 /* ctl->data points to idev->cnf.ignore_routes_when_linkdown
5430 * we should not modify it until we get the rtnl lock.
5435 ret = proc_dointvec(&lctl, write, buffer, lenp, ppos);
5438 ret = addrconf_fixup_linkdown(ctl, valp, val);
5444 static struct addrconf_sysctl_table
5446 struct ctl_table_header *sysctl_header;
5447 struct ctl_table addrconf_vars[DEVCONF_MAX+1];
5448 } addrconf_sysctl __read_mostly = {
5449 .sysctl_header = NULL,
5452 .procname = "forwarding",
5453 .data = &ipv6_devconf.forwarding,
5454 .maxlen = sizeof(int),
5456 .proc_handler = addrconf_sysctl_forward,
5459 .procname = "hop_limit",
5460 .data = &ipv6_devconf.hop_limit,
5461 .maxlen = sizeof(int),
5463 .proc_handler = proc_dointvec,
5467 .data = &ipv6_devconf.mtu6,
5468 .maxlen = sizeof(int),
5470 .proc_handler = addrconf_sysctl_mtu,
5473 .procname = "accept_ra",
5474 .data = &ipv6_devconf.accept_ra,
5475 .maxlen = sizeof(int),
5477 .proc_handler = proc_dointvec,
5480 .procname = "accept_redirects",
5481 .data = &ipv6_devconf.accept_redirects,
5482 .maxlen = sizeof(int),
5484 .proc_handler = proc_dointvec,
5487 .procname = "autoconf",
5488 .data = &ipv6_devconf.autoconf,
5489 .maxlen = sizeof(int),
5491 .proc_handler = proc_dointvec,
5494 .procname = "dad_transmits",
5495 .data = &ipv6_devconf.dad_transmits,
5496 .maxlen = sizeof(int),
5498 .proc_handler = proc_dointvec,
5501 .procname = "router_solicitations",
5502 .data = &ipv6_devconf.rtr_solicits,
5503 .maxlen = sizeof(int),
5505 .proc_handler = proc_dointvec,
5508 .procname = "router_solicitation_interval",
5509 .data = &ipv6_devconf.rtr_solicit_interval,
5510 .maxlen = sizeof(int),
5512 .proc_handler = proc_dointvec_jiffies,
5515 .procname = "router_solicitation_delay",
5516 .data = &ipv6_devconf.rtr_solicit_delay,
5517 .maxlen = sizeof(int),
5519 .proc_handler = proc_dointvec_jiffies,
5522 .procname = "force_mld_version",
5523 .data = &ipv6_devconf.force_mld_version,
5524 .maxlen = sizeof(int),
5526 .proc_handler = proc_dointvec,
5529 .procname = "mldv1_unsolicited_report_interval",
5531 &ipv6_devconf.mldv1_unsolicited_report_interval,
5532 .maxlen = sizeof(int),
5534 .proc_handler = proc_dointvec_ms_jiffies,
5537 .procname = "mldv2_unsolicited_report_interval",
5539 &ipv6_devconf.mldv2_unsolicited_report_interval,
5540 .maxlen = sizeof(int),
5542 .proc_handler = proc_dointvec_ms_jiffies,
5545 .procname = "use_tempaddr",
5546 .data = &ipv6_devconf.use_tempaddr,
5547 .maxlen = sizeof(int),
5549 .proc_handler = proc_dointvec,
5552 .procname = "temp_valid_lft",
5553 .data = &ipv6_devconf.temp_valid_lft,
5554 .maxlen = sizeof(int),
5556 .proc_handler = proc_dointvec,
5559 .procname = "temp_prefered_lft",
5560 .data = &ipv6_devconf.temp_prefered_lft,
5561 .maxlen = sizeof(int),
5563 .proc_handler = proc_dointvec,
5566 .procname = "regen_max_retry",
5567 .data = &ipv6_devconf.regen_max_retry,
5568 .maxlen = sizeof(int),
5570 .proc_handler = proc_dointvec,
5573 .procname = "max_desync_factor",
5574 .data = &ipv6_devconf.max_desync_factor,
5575 .maxlen = sizeof(int),
5577 .proc_handler = proc_dointvec,
5580 .procname = "max_addresses",
5581 .data = &ipv6_devconf.max_addresses,
5582 .maxlen = sizeof(int),
5584 .proc_handler = proc_dointvec,
5587 .procname = "accept_ra_defrtr",
5588 .data = &ipv6_devconf.accept_ra_defrtr,
5589 .maxlen = sizeof(int),
5591 .proc_handler = proc_dointvec,
5594 .procname = "accept_ra_min_hop_limit",
5595 .data = &ipv6_devconf.accept_ra_min_hop_limit,
5596 .maxlen = sizeof(int),
5598 .proc_handler = proc_dointvec,
5601 .procname = "accept_ra_pinfo",
5602 .data = &ipv6_devconf.accept_ra_pinfo,
5603 .maxlen = sizeof(int),
5605 .proc_handler = proc_dointvec,
5607 #ifdef CONFIG_IPV6_ROUTER_PREF
5609 .procname = "accept_ra_rtr_pref",
5610 .data = &ipv6_devconf.accept_ra_rtr_pref,
5611 .maxlen = sizeof(int),
5613 .proc_handler = proc_dointvec,
5616 .procname = "router_probe_interval",
5617 .data = &ipv6_devconf.rtr_probe_interval,
5618 .maxlen = sizeof(int),
5620 .proc_handler = proc_dointvec_jiffies,
5622 #ifdef CONFIG_IPV6_ROUTE_INFO
5624 .procname = "accept_ra_rt_info_max_plen",
5625 .data = &ipv6_devconf.accept_ra_rt_info_max_plen,
5626 .maxlen = sizeof(int),
5628 .proc_handler = proc_dointvec,
5633 .procname = "proxy_ndp",
5634 .data = &ipv6_devconf.proxy_ndp,
5635 .maxlen = sizeof(int),
5637 .proc_handler = addrconf_sysctl_proxy_ndp,
5640 .procname = "accept_source_route",
5641 .data = &ipv6_devconf.accept_source_route,
5642 .maxlen = sizeof(int),
5644 .proc_handler = proc_dointvec,
5646 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
5648 .procname = "optimistic_dad",
5649 .data = &ipv6_devconf.optimistic_dad,
5650 .maxlen = sizeof(int),
5652 .proc_handler = proc_dointvec,
5656 .procname = "use_optimistic",
5657 .data = &ipv6_devconf.use_optimistic,
5658 .maxlen = sizeof(int),
5660 .proc_handler = proc_dointvec,
5664 #ifdef CONFIG_IPV6_MROUTE
5666 .procname = "mc_forwarding",
5667 .data = &ipv6_devconf.mc_forwarding,
5668 .maxlen = sizeof(int),
5670 .proc_handler = proc_dointvec,
5674 .procname = "disable_ipv6",
5675 .data = &ipv6_devconf.disable_ipv6,
5676 .maxlen = sizeof(int),
5678 .proc_handler = addrconf_sysctl_disable,
5681 .procname = "accept_dad",
5682 .data = &ipv6_devconf.accept_dad,
5683 .maxlen = sizeof(int),
5685 .proc_handler = proc_dointvec,
5688 .procname = "force_tllao",
5689 .data = &ipv6_devconf.force_tllao,
5690 .maxlen = sizeof(int),
5692 .proc_handler = proc_dointvec
5695 .procname = "ndisc_notify",
5696 .data = &ipv6_devconf.ndisc_notify,
5697 .maxlen = sizeof(int),
5699 .proc_handler = proc_dointvec
5702 .procname = "suppress_frag_ndisc",
5703 .data = &ipv6_devconf.suppress_frag_ndisc,
5704 .maxlen = sizeof(int),
5706 .proc_handler = proc_dointvec
5709 .procname = "accept_ra_from_local",
5710 .data = &ipv6_devconf.accept_ra_from_local,
5711 .maxlen = sizeof(int),
5713 .proc_handler = proc_dointvec,
5716 .procname = "accept_ra_mtu",
5717 .data = &ipv6_devconf.accept_ra_mtu,
5718 .maxlen = sizeof(int),
5720 .proc_handler = proc_dointvec,
5723 .procname = "stable_secret",
5724 .data = &ipv6_devconf.stable_secret,
5725 .maxlen = IPV6_MAX_STRLEN,
5727 .proc_handler = addrconf_sysctl_stable_secret,
5730 .procname = "use_oif_addrs_only",
5731 .data = &ipv6_devconf.use_oif_addrs_only,
5732 .maxlen = sizeof(int),
5734 .proc_handler = proc_dointvec,
5737 .procname = "ignore_routes_with_linkdown",
5738 .data = &ipv6_devconf.ignore_routes_with_linkdown,
5739 .maxlen = sizeof(int),
5741 .proc_handler = addrconf_sysctl_ignore_routes_with_linkdown,
5749 static int __addrconf_sysctl_register(struct net *net, char *dev_name,
5750 struct inet6_dev *idev, struct ipv6_devconf *p)
5753 struct addrconf_sysctl_table *t;
5754 char path[sizeof("net/ipv6/conf/") + IFNAMSIZ];
5756 t = kmemdup(&addrconf_sysctl, sizeof(*t), GFP_KERNEL);
5760 for (i = 0; t->addrconf_vars[i].data; i++) {
5761 t->addrconf_vars[i].data += (char *)p - (char *)&ipv6_devconf;
5762 t->addrconf_vars[i].extra1 = idev; /* embedded; no ref */
5763 t->addrconf_vars[i].extra2 = net;
5766 snprintf(path, sizeof(path), "net/ipv6/conf/%s", dev_name);
5768 t->sysctl_header = register_net_sysctl(net, path, t->addrconf_vars);
5769 if (!t->sysctl_header)
5781 static void __addrconf_sysctl_unregister(struct ipv6_devconf *p)
5783 struct addrconf_sysctl_table *t;
5790 unregister_net_sysctl_table(t->sysctl_header);
5794 static int addrconf_sysctl_register(struct inet6_dev *idev)
5798 if (!sysctl_dev_name_is_allowed(idev->dev->name))
5801 err = neigh_sysctl_register(idev->dev, idev->nd_parms,
5802 &ndisc_ifinfo_sysctl_change);
5805 err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
5808 neigh_sysctl_unregister(idev->nd_parms);
5813 static void addrconf_sysctl_unregister(struct inet6_dev *idev)
5815 __addrconf_sysctl_unregister(&idev->cnf);
5816 neigh_sysctl_unregister(idev->nd_parms);
5822 static int __net_init addrconf_init_net(struct net *net)
5825 struct ipv6_devconf *all, *dflt;
5827 all = kmemdup(&ipv6_devconf, sizeof(ipv6_devconf), GFP_KERNEL);
5831 dflt = kmemdup(&ipv6_devconf_dflt, sizeof(ipv6_devconf_dflt), GFP_KERNEL);
5833 goto err_alloc_dflt;
5835 /* these will be inherited by all namespaces */
5836 dflt->autoconf = ipv6_defaults.autoconf;
5837 dflt->disable_ipv6 = ipv6_defaults.disable_ipv6;
5839 dflt->stable_secret.initialized = false;
5840 all->stable_secret.initialized = false;
5842 net->ipv6.devconf_all = all;
5843 net->ipv6.devconf_dflt = dflt;
5845 #ifdef CONFIG_SYSCTL
5846 err = __addrconf_sysctl_register(net, "all", NULL, all);
5850 err = __addrconf_sysctl_register(net, "default", NULL, dflt);
5856 #ifdef CONFIG_SYSCTL
5858 __addrconf_sysctl_unregister(all);
5868 static void __net_exit addrconf_exit_net(struct net *net)
5870 #ifdef CONFIG_SYSCTL
5871 __addrconf_sysctl_unregister(net->ipv6.devconf_dflt);
5872 __addrconf_sysctl_unregister(net->ipv6.devconf_all);
5874 kfree(net->ipv6.devconf_dflt);
5875 kfree(net->ipv6.devconf_all);
5878 static struct pernet_operations addrconf_ops = {
5879 .init = addrconf_init_net,
5880 .exit = addrconf_exit_net,
5883 static struct rtnl_af_ops inet6_ops __read_mostly = {
5885 .fill_link_af = inet6_fill_link_af,
5886 .get_link_af_size = inet6_get_link_af_size,
5887 .validate_link_af = inet6_validate_link_af,
5888 .set_link_af = inet6_set_link_af,
5892 * Init / cleanup code
5895 int __init addrconf_init(void)
5897 struct inet6_dev *idev;
5900 err = ipv6_addr_label_init();
5902 pr_crit("%s: cannot initialize default policy table: %d\n",
5907 err = register_pernet_subsys(&addrconf_ops);
5911 addrconf_wq = create_workqueue("ipv6_addrconf");
5917 /* The addrconf netdev notifier requires that loopback_dev
5918 * has it's ipv6 private information allocated and setup
5919 * before it can bring up and give link-local addresses
5920 * to other devices which are up.
5922 * Unfortunately, loopback_dev is not necessarily the first
5923 * entry in the global dev_base list of net devices. In fact,
5924 * it is likely to be the very last entry on that list.
5925 * So this causes the notifier registry below to try and
5926 * give link-local addresses to all devices besides loopback_dev
5927 * first, then loopback_dev, which cases all the non-loopback_dev
5928 * devices to fail to get a link-local address.
5930 * So, as a temporary fix, allocate the ipv6 structure for
5931 * loopback_dev first by hand.
5932 * Longer term, all of the dependencies ipv6 has upon the loopback
5933 * device and it being up should be removed.
5936 idev = ipv6_add_dev(init_net.loopback_dev);
5939 err = PTR_ERR(idev);
5943 for (i = 0; i < IN6_ADDR_HSIZE; i++)
5944 INIT_HLIST_HEAD(&inet6_addr_lst[i]);
5946 register_netdevice_notifier(&ipv6_dev_notf);
5950 rtnl_af_register(&inet6_ops);
5952 err = __rtnl_register(PF_INET6, RTM_GETLINK, NULL, inet6_dump_ifinfo,
5957 /* Only the first call to __rtnl_register can fail */
5958 __rtnl_register(PF_INET6, RTM_NEWADDR, inet6_rtm_newaddr, NULL, NULL);
5959 __rtnl_register(PF_INET6, RTM_DELADDR, inet6_rtm_deladdr, NULL, NULL);
5960 __rtnl_register(PF_INET6, RTM_GETADDR, inet6_rtm_getaddr,
5961 inet6_dump_ifaddr, NULL);
5962 __rtnl_register(PF_INET6, RTM_GETMULTICAST, NULL,
5963 inet6_dump_ifmcaddr, NULL);
5964 __rtnl_register(PF_INET6, RTM_GETANYCAST, NULL,
5965 inet6_dump_ifacaddr, NULL);
5966 __rtnl_register(PF_INET6, RTM_GETNETCONF, inet6_netconf_get_devconf,
5967 inet6_netconf_dump_devconf, NULL);
5969 ipv6_addr_label_rtnl_register();
5973 rtnl_af_unregister(&inet6_ops);
5974 unregister_netdevice_notifier(&ipv6_dev_notf);
5976 destroy_workqueue(addrconf_wq);
5978 unregister_pernet_subsys(&addrconf_ops);
5980 ipv6_addr_label_cleanup();
5985 void addrconf_cleanup(void)
5987 struct net_device *dev;
5990 unregister_netdevice_notifier(&ipv6_dev_notf);
5991 unregister_pernet_subsys(&addrconf_ops);
5992 ipv6_addr_label_cleanup();
5996 __rtnl_af_unregister(&inet6_ops);
5998 /* clean dev list */
5999 for_each_netdev(&init_net, dev) {
6000 if (__in6_dev_get(dev) == NULL)
6002 addrconf_ifdown(dev, 1);
6004 addrconf_ifdown(init_net.loopback_dev, 2);
6009 spin_lock_bh(&addrconf_hash_lock);
6010 for (i = 0; i < IN6_ADDR_HSIZE; i++)
6011 WARN_ON(!hlist_empty(&inet6_addr_lst[i]));
6012 spin_unlock_bh(&addrconf_hash_lock);
6013 cancel_delayed_work(&addr_chk_work);
6016 destroy_workqueue(addrconf_wq);